CN103469792A - Method for conducting grouting construction at back of pile bottom of cast-in-place pile - Google Patents
Method for conducting grouting construction at back of pile bottom of cast-in-place pile Download PDFInfo
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- CN103469792A CN103469792A CN2013104042742A CN201310404274A CN103469792A CN 103469792 A CN103469792 A CN 103469792A CN 2013104042742 A CN2013104042742 A CN 2013104042742A CN 201310404274 A CN201310404274 A CN 201310404274A CN 103469792 A CN103469792 A CN 103469792A
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Abstract
A method for conducting grouting construction at the back of the pile bottom of a cast-in-place pile sequentially includes the following steps: (1) manufacturing and arranging a grouting pipe which comprises a plurality of grouting steel pipe sections sequentially connected from top to bottom with the lower end of the lowest grouting steel pipe section connected with a grouting spraying nozzle; (2) assembling a grouting station and a slurry transportation pipeline; (3) grouting. The method is characterized in that the grouting spraying nozzle used in the step (1) comprises a slurry spraying pipe body, a slurry inlet is formed in the upper end of the slurry spraying pipe body, a plurality of slurry discharging holes are formed in the lateral wall of the slurry spraying pipe body, a grouting one-way valve is installed on the slurry discharging holes, a sand wrapping device is arranged on the outside of the slurry spraying pipe body, a sand isolation layer is arranged between the sand wrapping device and the outer side of the slurry spraying pipe body, and the sand isolation layer covers the grouting one-way valve. When the grouting spraying nozzle reaches the bottom of a pile hole, and the portion of the upper end of the grouting pipe higher than the ground reaches preset height, the upper end of the grouting pipe is fixedly connected with a protection barrel at the top of the pile hole. By means of the method, smooth grouting can be achieved, grouting quality is ensured, and success ratio is ensured.
Description
Technical field
The present invention relates to the job practices of foundation pile of building, be specifically related to a kind of grout pile bottom post-grouting job practices.
Background technology
Castinplace pile, because its bearing capacity is high, applicability is strong, is widely used in construction work, but the defect of castinplace pile also can cause the bearing capacity of single pile deficiency due to reason in a certain respect.Post Grouting Technique is a kind of auxiliary process of filling pile construction, can effectively make up the defect of castinplace pile, improves the bearing capacity of single pile.The grout pile bottom post-grouting means: when after concrete bored pile piling, pile concrete reaches some strength, by grouting behind shaft or drift lining equipment, the cement paste pressurization is injected to the stake end, by cement paste ooze expansion, splitting, filling, densification and consolidation, eliminate the two large defects such as the intrinsic pile body mud skin of castinplace pile and pile bottom sediment (roach).Adopt Injection Technology under Pile, can fundamentally solve the technical barrier that pile body mud skin and pile bottom sediment affect the cast-in-place pile concrete pouring quality, reduce bearing capacity of pile tip, effectively make up the defect of castinplace pile, improve the bearing capacity of single pile, reduce the sedimentation of pile foundation, guarantee that the pile foundation engineering quality is significant.
At present, usually after a stake hole (pore-forming clear hole) is bored in injection, the mode by Grouting Pipe by colligation or welding is fixed on the reinforcing cage inboard, synchronously puts into a hole, at the bottom of the slip casting injector head of Grouting Pipe lower end extends a hole, and approximately 20 centimetres, an aperture is exposed at the Grouting Pipe top; Clear hole placing of concrete subsequently, pile is implemented the grouting behind shaft or drift lining operation after 2 days.Grouting behind shaft or drift lining equipment used comprises slip casting station, grout pipe line and above-mentioned Grouting Pipe.The slip casting station generally includes high-pressure injection pump, cement mixer, slurries filtration facility and water storage box, wherein cement mixer is for preparing cement paste, the slurries filtration facility is for the impurity of elimination cement paste, and high-pressure injection pump is sent cement paste with certain pressure from the slip casting station.Grouting Pipe comprises the more piece slip casting lengths of steel pipes (can welding or be threaded between adjacent two joint slip casting lengths of steel pipes) connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects slip casting injector head (slip casting injector head upper end connects nethermost slip casting lengths of steel pipes lower end); Slip casting injector head upper end is provided with stock inlet, the sidewall of slip casting injector head is provided with a plurality of slurry outlets, the slip casting one way valve is installed (by the slip casting one way valve is set on slurry outlet, when carrying out pour stake body by concrete, slurries can not pour in the slip casting injector head, during slip casting, cement paste can not reflux yet), slip casting injector head lower end closed.Grout pipe line can adopt the defeated slurry flexible pipe of high pressure (the defeated slurry flexible pipe of high pressure refers to the defeated slurry flexible pipe that can bear high pressure), and grout outlet, the other end that defeated slurry flexible pipe one end of high pressure connects high-pressure injection pump connect the Grouting Pipe open top; Grout pipe line also can be formed by connecting by defeated slurry steel pipe and the defeated slurry flexible pipe of high pressure, and the grout outlet of high-pressure injection pump connects the opening at Grouting Pipe top successively through defeated slurry steel pipe, the defeated slurry flexible pipe of high pressure.High-pressure injection pump will be in the slip casting station be sent through the cement paste filtered, and cement paste enters Grouting Pipe from the Grouting Pipe open top after grout pipe line, and cement paste and slurry outlet from slip casting injector head ejection descending along the Grouting Pipe cavity subsequently, carry out slip casting.
Yet, because Grouting Pipe and reinforcing cage are fixed together, easily, because rising of steel cage drives also floating thereupon of Grouting Pipe, affect carrying out smoothly of slip casting, cause slip casting unsuccessfully; And; after concrete bored pile piling; the slip casting injector head outside often is enclosed with the cement paste solidified; so that the slip casting one way valve is difficult for opening; the every wheel starts before slip casting to need just can press off the slip casting one way valve on the slip casting injector head with pressure up to the high pressure clear water of 8-10MPa; and the situation that often there will be the slip casting injector head to stop up, slip casting smoothly.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of grout pile bottom post-grouting job practices, adopts the slip casting smoothly of this method, guarantees grouting quality and success rate.The technical scheme adopted is as follows:
A kind of grout pile bottom post-grouting job practices, comprise the steps: that (1) makes and Laying injection pipe successively, and described Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects the slip casting injector head; (2) installing slip casting station and grout pipe line; (3) slip casting is characterized in that:
In step (1), slip casting lengths of steel pipes used comprises the slip casting body, slip casting injector head used comprises the whitewashing body, and slip casting body upper end and whitewashing body upper end are equipped with steel bushing, and the cross section inner edge of steel bushing and cross section outer rim shape and the size of slip casting body are complementary; Whitewashing body upper end has stock inlet, the sidewall of whitewashing body is provided with a plurality of slurry outlets, the slip casting one way valve is installed on slurry outlet, whitewashing body lower end closed, arranged outside at the whitewashing body has the sand Wrap device, be provided with the sand separation layer between the lateral surface of sand Wrap device and whitewashing body, all slip casting one way valve covering on body of whitewash of sand separation layer;
In step (1), the method for making and Laying injection pipe is: first by the slip casting body lower end of nethermost slip casting lengths of steel pipes, insert in the steel bushing of being located at whitewashing body upper end and welding, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; The following joint slip casting lengths of steel pipes subsequently top each slip casting lengths of steel pipes is adjacent section by section connects, and the connected mode between adjacent two slip casting lengths of steel pipes is to insert in the steel bushing of the following joint slip casting lengths of steel pipes upper end be adjacent and welding by the slip casting body lower end of top slip casting lengths of steel pipes; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is vertically transferred along the reinforcing cage inboard; At the bottom of the Grouting Pipe injector head arrives stake hole, hole and the overhead part in Grouting Pipe upper end while reaching predetermined altitude, the casing at Yu Zhuankong top, Grouting Pipe upper end is fixedly connected with, thereby completes the making of Grouting Pipe and lay.
Usually require the slip casting one way valve can bear the above hydrostatic pressure of 1Mpa and there is return-stopping function.
In a kind of preferred version, above-mentioned sand Wrap device comprises the reinforcing bar oversheath that is enclosed within the external side of shotcrete pipe, whitewashing body lower end and all slip casting one way valves all are in the cavity of reinforcing bar oversheath, and reinforcing bar oversheath inboard is provided with inner liner, between inner liner and reinforcing bar oversheath, is provided with wire gauze; Described sand separation layer consists of the sand between the lateral surface that is filled in inner liner and whitewashing body; The reinforcing bar oversheath adopts reinforcing bar to be welded, and all has the through hole passed through for cement paste on the bottom of reinforcing bar oversheath and sidewall, and the reinforcing bar oversheath is fixedly connected with the whitewashing body.The sand of filling can be fine sand, medium sand or coarse sand.Above-mentioned reinforcing bar oversheath has higher intensity, makes the sand Wrap device keep its shape, as the skin protection of sand separation layer; Above-mentioned inner liner can adopt nonwoven, plastic sheeting (usually adopting multilayer plastic film) or plastic gauze (mesh size of plastic gauze should be less than the particle diameter of sand), and its effect is to wrap sand, prevents that sand from leaking; Bottom and the through hole on sidewall of reinforcing bar oversheath are usually larger, and the effect of above-mentioned wire gauze is the through hole blocked on the reinforcing bar oversheath, prevent the outside distending of inner liner, contribute to make the sand separation layer to keep stable.Above-mentioned reinforcing bar oversheath can be ellipsoid shape or cylindric.Usually, before heap sand, above-mentioned wire gauze and inner liner cover the bottom of reinforcing bar oversheath and the inboard of sidewall, and wire gauze upper end and inner liner upper end have opening, so that heap sand; During Specific construction, the reinforcing bar oversheath that inboard can be provided with to wire gauze and inner liner is enclosed within on the whitewashing body from bottom to top, then insert sand between the lateral surface of inner liner and whitewashing body, after forming the sand separation layer, the opening of sealing wire gauze upper end and inner liner upper end, then be welded and fixed the reinforcing bar of reinforcing bar oversheath upper end and whitewashing body.The sand Wrap device sound construction of said structure, can effectively protect layer of sand, guarantees that the process medium sand separation layer of Laying injection pipe is excellent, thereby guarantee slip casting success rate (the slip casting success rate can reach 100%).
In other scheme, above-mentioned sand Wrap device also can adopt nonwoven or plastic sheeting (generally adopting multilayer plastic film) to form; After utilizing nonwoven or plastic sheeting to wrap sand and forming the sand separation layer, adopt adhesive tape that this nonwoven or plastic sheeting are fixed on the whitewashing body.The advantage of this scheme is simple, is convenient to make at any time, and its shortcoming is that the sand Wrap device is easily unexpected damaged, and sand may cause the slip casting failure after leaking.
In step (1), during welding, must guarantee the intensity of Grouting Pipe weld, without rosin joint, dry joint, solder skip.Usually require slip casting lengths of steel pipes and each soldering opening can bear the injection pressure of 10.0MPa.
Usually, in step (1), after completing the making of Grouting Pipe and laying, the slip casting injector head should protrude outer 250 millimeter of reinforcing cage, and the Grouting Pipe upper end must 500 millimeter above ground level.
In step (1), can adopt colligation to fix or the mode of welding is fixedly connected with the casing at Yu Zhuankong top, Grouting Pipe upper end.
Common above-mentioned slip casting body, whitewashing body and steel bushing all adopt round steel pipe to make.
In order to be more convenient for carrying out the welding job of Grouting Pipe, guarantee that Grouting Pipe welding quality and welding position are correct, in preferred version, in step (1), when making and Laying injection pipe, at the added Grouting Pipe welding support that is provided with of the casing at top, stake hole, this Grouting Pipe welding comprises support body and Grouting Pipe gripper shoe with support, the Grouting Pipe gripper shoe is fixed on support body, the Grouting Pipe gripper shoe is provided with circular hole and at least one bar shaped hole, bar hole one end communicates with circular hole, the diameter of circular hole is greater than the external diameter of steel bushing, the width of bar hole is less than the external diameter of steel bushing, and the external diameter of slip casting body and whitewashing body all is less than the width of bar hole, while carrying out the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, the whitewashing body of slip casting injector head is in the bar hole on the Grouting Pipe gripper shoe, steel bushing on the slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe, now the Grouting Pipe gripper shoe supports the slip casting injector head, by operating personnel, carries out weld job, after completing the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, mobile Grouting Pipe welding support, circular hole on the Grouting Pipe gripper shoe is aimed at the steel bushing on the slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing on the slip casting injector head is passed down through circular hole, subsequently, mobile Grouting Pipe is welded and is used support again, the slip casting body of described nethermost slip casting lengths of steel pipes is in the bar hole on the Grouting Pipe gripper shoe, and the steel bushing of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe, then by operating personnel, carry out weld job, a top joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes are welded together, mobile Grouting Pipe is welded and is used support more subsequently, circular hole on the Grouting Pipe gripper shoe is aimed at the steel bushing of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing of described nethermost slip casting lengths of steel pipes is passed down through circular hole, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, remove Grouting Pipe welding support after completing the welding of all slip casting lengths of steel pipes.Above-mentioned Grouting Pipe welding is simple and practical with support, by using above-mentioned Grouting Pipe welding, uses support, makes the welding job of capable Grouting Pipe be more convenient for carrying out, and can save staff, improves welding efficiency, and more easily guarantees welding quality.
Usually, Grouting Pipe is transferred to precalculated position, in Grouting Pipe, fills with clear water, and seals the Grouting Pipe upper end open with pipe cap.
The quantity of Grouting Pipe arranges according to the stake footpath size of castinplace pile, usually, is not more than the stake of 1200 millimeters for diameter, and 2 Grouting Pipe should be set, and these 2 Grouting Pipe are uniformly distributed along the reinforcing cage circumferencial direction; For diameter be greater than 1200 millimeters and be not more than 2500 millimeters the stake, 3 Grouting Pipe should be set, these 3 Grouting Pipe are uniformly distributed along the reinforcing cage circumferencial direction.
In step (2), the way of installing slip casting station and grout pipe line can be with reference to traditional grout pile bottom post-grouting job practices.
In step (3), the slip casting operation should start after 2 days by pile, generally should not be later than pile after 30 days, and the way of slip casting can be with reference to traditional grout pile bottom post-grouting job practices.
The present invention passes through at slip casting one way valve arranged outside sand Wrap device, and back-up sand and form the sand separation layer in the sand Wrap device, greatly reduce and open the required initial pressure of slip casting one way valve, the every wheel starts the front high pressure clear water that need be only 2-3MPa with pressure of slip casting, can press off the slip casting one way valve on the slip casting injector head, the slip casting one way valve is easy to just open, thereby has stopped the situation generation that the slip casting injector head stops up; Simultaneously, all there is the sand of certain thickness (as 2～3 centimetres) in each slip casting one way valve outside, forms soft topping, increases the diffusion area of cement paste, and the cement paste that makes the ejection of slip casting injector head can be more effectively in slip casting one way valve exit, effectively flow; Be fixed on a casing at top, hole by the Grouting Pipe top that will expose a face, can prevent that Grouting Pipe from moving up and down with reinforcing cage, the harm of having avoided rising of steel cage to bring to Grouting Pipe.Briefly, the present invention is improved by the making to Grouting Pipe and the mode of laying, and can realize smooth slip casting, guarantees grouting quality and success rate.
Grout pile bottom post-grouting job practices of the present invention can be used for all kinds of brills, digs, the reinforcing of the stake end certain limit soil body of Punching Borehole Cast-in-place Concrete Pile.
The accompanying drawing explanation
Fig. 1 is the structural representation of preferred embodiment of the present invention slip casting injector head used;
Fig. 2 is the structural representation of preferred embodiment of the present invention slip casting lengths of steel pipes used;
Fig. 3 is the structural representation (top view) of preferred embodiment of the present invention Grouting Pipe welding used with support.
The specific embodiment
This grout pile bottom post-grouting job practices comprises the steps: successively
(1) making and Laying injection pipe
Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects the slip casting injector head.With reference to figure 1 and Fig. 2, slip casting lengths of steel pipes used comprises slip casting body 1, slip casting injector head used comprises whitewashing body 2, slip casting body 1 upper end is provided with steel bushing 3, whitewashing body 2 upper ends also are provided with steel bushing 3, and the cross section inner edge of steel bushing 3 and cross section outer rim shape and the size of slip casting body 1 are complementary; Whitewashing body 2 upper ends have stock inlet 4, the sidewall of whitewashing body 2 is provided with a plurality of slurry outlets 5, slip casting one way valve 6 is installed on slurry outlet 5, whitewashing body 2 lower end closed, arranged outside at whitewashing body 2 has sand Wrap device 7, be provided with sand separation layer 8 between the lateral surface of sand Wrap device 7 and whitewashing body 2, sand separation layer 8 all slip casting one way valve 6 coverings on body 2 of whitewash; The thickness of sand separation layer 8 is 2～3 centimetres.Slip casting body 1, whitewashing body 2 and steel bushing 3 all adopt round steel pipe to make that (it is that the round steel pipe that 25.5 millimeters, pipe thickness are 3.0 millimeters is made that the body 2 of for example whitewashing, slip casting body 1 adopt internal diameter; Steel bushing 3 adopts the round steel pipe that pipe thickness is 3.0 millimeters to make, and the length of steel bushing is 100 millimeters).Slip casting one way valve 6 can bear the above hydrostatic pressure of 1Mpa and have return-stopping function.
In this step (1), the method of making and Laying injection pipe is: first by the slip casting body of nethermost slip casting lengths of steel pipes 1 lower end, insert in the steel bushing 3 of being located at whitewashing body 2 upper ends and welding, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; The following joint slip casting lengths of steel pipes subsequently top each slip casting lengths of steel pipes is adjacent section by section connects, and the connected mode between adjacent two slip casting lengths of steel pipes is to insert in the steel bushing 3 of the following joint slip casting lengths of steel pipes upper end be adjacent and welding by the slip casting body of top slip casting lengths of steel pipes 1 lower end; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is vertically transferred along the reinforcing cage inboard; At the bottom of the Grouting Pipe injector head arrives stake hole, hole and the overhead part in Grouting Pipe upper end while reaching predetermined altitude (for example, 500 millimeters above ground level of Grouting Pipe upper end), the casing at Yu Zhuankong top, Grouting Pipe upper end is fixedly connected with (can adopt colligation to fix or the mode of welding is fixedly connected with the casing at Yu Zhuankong top, Grouting Pipe upper end), thereby completes the making of Grouting Pipe and lay.During welding, must guarantee the intensity of Grouting Pipe weld, without rosin joint, dry joint, solder skip, each soldering opening can bear the injection pressure of 10.0MPa.
In step (1), when making and Laying injection pipe, at the added Grouting Pipe welding support that is provided with of the casing at top, stake hole, with reference to figure 3, this Grouting Pipe welding comprises support body 9 and Grouting Pipe gripper shoe 10 with support, Grouting Pipe gripper shoe 10 is fixed on support body 9, Grouting Pipe gripper shoe 10 is provided with circular hole 11 and two bar holes 12, two bar holes 12 respectively have an end to communicate with circular hole 11, the diameter of circular hole 11 is greater than the external diameter of steel bushing 3, the width of bar hole 12 is less than the external diameter of steel bushing 3, and the external diameter of slip casting body 1 and whitewashing body 2 all is less than the width of bar hole 12, in the present embodiment, support body 9 is by two support bars 91 be formed by connecting with two bars 92 that reinforce the connection (bar 92 two ends that reinforce the connection are fixedly connected with two support bars 91 respectively), two support bars 91 are parallel to each other, Grouting Pipe gripper shoe 10 both sides are fixedly connected with two support bars 91 respectively, and the length of support bar 91 is greater than the external diameter of the casing at above-mentioned stake top, hole.While carrying out the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, the whitewashing body 2 of slip casting injector head is in the bar hole 12 on Grouting Pipe gripper shoe 10, steel bushing 3 on the slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe 10, now Grouting Pipe gripper shoe 10 supports the slip casting injector head, by operating personnel, carries out weld job, after completing the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, mobile Grouting Pipe welding support, circular hole 11 on Grouting Pipe gripper shoe 10 is aimed at the steel bushing 3 on the slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing 3 on the slip casting injector head is passed down through circular hole 11, subsequently, mobile Grouting Pipe is welded and is used support again, the slip casting body 1 of described nethermost slip casting lengths of steel pipes is in the bar hole 12 on Grouting Pipe gripper shoe 10, and the steel bushing 3 of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe 10, then by operating personnel, carry out weld job, a top joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes are welded together, mobile Grouting Pipe is welded and is used support more subsequently, circular hole 11 on Grouting Pipe gripper shoe 10 is aimed at the steel bushing 3 of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing 3 of described nethermost slip casting lengths of steel pipes is passed down through circular hole 11, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, remove Grouting Pipe welding support after completing the welding of all slip casting lengths of steel pipes.
With reference to figure 1, in the present embodiment, sand Wrap device 7 comprises the reinforcing bar oversheath 71 that is enclosed within whitewashing body 2 outsides, whitewashing body 2 lower ends and all slip casting one way valves 6 all are in the cavity of reinforcing bar oversheath 71, reinforcing bar oversheath 71 inboards are provided with inner liner 72, between inner liner 72 and reinforcing bar oversheath 71, are provided with wire gauze 73; Described sand separation layer 8 consists of the sand between the lateral surface that is filled in inner liner 72 and whitewashing body 2; Reinforcing bar oversheath 71 adopts reinforcing bar to be welded, and all has the through hole passed through for cement paste on the bottom of reinforcing bar oversheath 71 and sidewall, and reinforcing bar oversheath 71 is fixedly connected with whitewashing body 2.The sand of filling can be fine sand, medium sand or coarse sand.Inner liner 72 can adopt nonwoven, plastic sheeting (usually adopting multilayer plastic film) or plastic gauze (mesh size of plastic gauze should be less than the particle diameter of sand).Before heap sand, wire gauze 73 and inner liner 72 cover the bottom of reinforcing bar oversheath 71 and the inboard of sidewall, and wire gauze 73 upper ends and inner liner 72 upper ends have opening, so that heap sand; During Specific construction, the reinforcing bar oversheath 71 that inboard is provided with to wire gauze 73 and inner liner 72 is enclosed within on whitewashing body 2 from bottom to top, then insert sand between the lateral surface of inner liner 72 and whitewashing body 2, after forming sand separation layer 8, the opening of sealing wire gauze 73 upper ends and inner liner 73 upper ends, then be welded and fixed the reinforcing bar of reinforcing bar oversheath 71 upper ends and whitewashing body 2.
Grouting Pipe is transferred to precalculated position, in Grouting Pipe, fills with clear water, and seals the Grouting Pipe upper end open with pipe cap.
The quantity of Grouting Pipe arranges according to the stake footpath size of castinplace pile, and for example: be not more than the stake of 1200 millimeters for diameter, 2 Grouting Pipe should be set, these 2 Grouting Pipe are uniformly distributed along the reinforcing cage circumferencial direction; For diameter be greater than 1200 millimeters and be not more than 2500 millimeters the stake, 3 Grouting Pipe should be set, these 3 Grouting Pipe are uniformly distributed along the reinforcing cage circumferencial direction.
(2) installing slip casting station and grout pipe line
In this step (2), the way of installing slip casting station and grout pipe line is consistent with prior art, can, with reference to traditional grout pile bottom post-grouting job practices, at this, not be further described.
(3) slip casting
The slip casting operation should start after 2 days by pile, generally should not be later than pile after 30 days.In this step (3), the way of slip casting is consistent with prior art, can, with reference to traditional grout pile bottom post-grouting job practices, at this, not be further described.During grout injection, water under high pressure mud is through sand separation layer 6, inner liner 72(when inner liner 72 adopts nonwoven or plastic sheeting, and water under high pressure mud can break through inner liner 72), wire gauze 73, rear injections of reinforcing bar oversheath 71 end.
In other scheme, the sand Wrap device in step (1) also can adopt nonwoven or plastic sheeting (generally adopting multilayer plastic film) to form; After utilizing nonwoven or plastic sheeting to wrap sand and forming the sand separation layer, adopt adhesive tape that this nonwoven or plastic sheeting are fixed on the whitewashing body.
Claims (5)
1. a grout pile bottom post-grouting job practices, comprise the steps: that (1) makes and Laying injection pipe successively, and described Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects the slip casting injector head; (2) installing slip casting station and grout pipe line; (3) slip casting is characterized in that:
In step (1), slip casting lengths of steel pipes used comprises the slip casting body, slip casting injector head used comprises the whitewashing body, and slip casting body upper end and whitewashing body upper end are equipped with steel bushing, and the cross section inner edge of steel bushing and cross section outer rim shape and the size of slip casting body are complementary; Whitewashing body upper end has stock inlet, the sidewall of whitewashing body is provided with a plurality of slurry outlets, the slip casting one way valve is installed on slurry outlet, whitewashing body lower end closed, arranged outside at the whitewashing body has the sand Wrap device, be provided with the sand separation layer between the lateral surface of sand Wrap device and whitewashing body, all slip casting one way valve covering on body of whitewash of sand separation layer;
In step (1), the method for making and Laying injection pipe is: first by the slip casting body lower end of nethermost slip casting lengths of steel pipes, insert in the steel bushing of being located at whitewashing body upper end and welding, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; The following joint slip casting lengths of steel pipes subsequently top each slip casting lengths of steel pipes is adjacent section by section connects, and the connected mode between adjacent two slip casting lengths of steel pipes is to insert in the steel bushing of the following joint slip casting lengths of steel pipes upper end be adjacent and welding by the slip casting body lower end of top slip casting lengths of steel pipes; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is vertically transferred along the reinforcing cage inboard; At the bottom of the Grouting Pipe injector head arrives stake hole, hole and the overhead part in Grouting Pipe upper end while reaching predetermined altitude, the casing at Yu Zhuankong top, Grouting Pipe upper end is fixedly connected with, thereby completes the making of Grouting Pipe and lay.
2. grout pile bottom post-grouting job practices according to claim 1, it is characterized in that: described sand Wrap device comprises the reinforcing bar oversheath that is enclosed within the external side of shotcrete pipe, whitewashing body lower end and all slip casting one way valves all are in the cavity of reinforcing bar oversheath, reinforcing bar oversheath inboard is provided with inner liner, between inner liner and reinforcing bar oversheath, is provided with wire gauze; Described sand separation layer consists of the sand between the lateral surface that is filled in inner liner and whitewashing body; The reinforcing bar oversheath adopts reinforcing bar to be welded, and all has the through hole passed through for cement paste on the bottom of reinforcing bar oversheath and sidewall, and the reinforcing bar oversheath is fixedly connected with the whitewashing body.
3. grout pile bottom post-grouting job practices according to claim 2, it is characterized in that: described inner liner is nonwoven, plastic sheeting or plastic gauze.
4. according to the described grout pile bottom post-grouting of claim 1-3 any one job practices, it is characterized in that: in step (1), adopt colligation to fix or the mode of welding is fixedly connected with the casing at Yu Zhuankong top, Grouting Pipe upper end.
5. according to the described grout pile bottom post-grouting of claim 1-3 any one job practices, it is characterized in that: described slip casting body, whitewashing body and steel bushing all adopt round steel pipe to make, in step (1), when making and Laying injection pipe, at the added Grouting Pipe welding support that is provided with of the casing at top, stake hole, this Grouting Pipe welding comprises support body and Grouting Pipe gripper shoe with support, the Grouting Pipe gripper shoe is fixed on support body, the Grouting Pipe gripper shoe is provided with circular hole and at least one bar shaped hole, bar hole one end communicates with circular hole, the diameter of circular hole is greater than the external diameter of steel bushing, the width of bar hole is less than the external diameter of steel bushing, and the external diameter of slip casting body and whitewashing body all is less than the width of bar hole, while carrying out the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, the whitewashing body of slip casting injector head is in the bar hole on the Grouting Pipe gripper shoe, steel bushing on the slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe, now the Grouting Pipe gripper shoe supports the slip casting injector head, by operating personnel, carries out weld job, after completing the welding between nethermost slip casting lengths of steel pipes and slip casting injector head, mobile Grouting Pipe welding support, circular hole on the Grouting Pipe gripper shoe is aimed at the steel bushing on the slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing on the slip casting injector head is passed down through circular hole, subsequently, mobile Grouting Pipe is welded and is used support again, the slip casting body of described nethermost slip casting lengths of steel pipes is in the bar hole on the Grouting Pipe gripper shoe, and the steel bushing of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe, then by operating personnel, carry out weld job, a top joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes are welded together, mobile Grouting Pipe is welded and is used support more subsequently, circular hole on the Grouting Pipe gripper shoe is aimed at the steel bushing of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing of described nethermost slip casting lengths of steel pipes is passed down through circular hole, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, remove Grouting Pipe welding support after completing the welding of all slip casting lengths of steel pipes.
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| CN103924584A (en) * | 2014-03-14 | 2014-07-16 | 浙江新邦建设有限公司 | Cast-in-situ bored pile construction method |
| CN104532832A (en) * | 2014-11-20 | 2015-04-22 | 上海智岛建筑科技有限公司 | Steel retaining cylinder and application method thereof |
| CN104612134A (en) * | 2014-12-16 | 2015-05-13 | 中铁建大桥工程局集团第五工程有限公司 | Cast-in place pile post-grouting construction method for pouring construction |
| CN105220687A (en) * | 2014-06-30 | 2016-01-06 | 中国一冶集团有限公司 | Prestressed concrete pipe pile grouting behind shaft or drift lining method fills with core reinforcing construction method |
| CN108677939A (en) * | 2018-06-07 | 2018-10-19 | 上海勘察设计研究院(集团)有限公司 | A kind of pile-end post-grouting failure method of disposal and device |
| WO2023016034A1 (en) * | 2021-08-09 | 2023-02-16 | 高永光 | Pile end bottom grouting apparatus, cast-in-place pile and construction method therefor |
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| CN105220687B (en) * | 2014-06-30 | 2017-04-05 | 中国一冶集团有限公司 | Prestressed concrete pipe pile grouting behind shaft or drift lining method fills core reinforcing construction method |
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| CN108677939A (en) * | 2018-06-07 | 2018-10-19 | 上海勘察设计研究院(集团)有限公司 | A kind of pile-end post-grouting failure method of disposal and device |
| CN108677939B (en) * | 2018-06-07 | 2020-11-27 | 上海勘察设计研究院(集团)有限公司 | Pile end post-grouting failure handling method and device |
| WO2023016034A1 (en) * | 2021-08-09 | 2023-02-16 | 高永光 | Pile end bottom grouting apparatus, cast-in-place pile and construction method therefor |
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| CN103469792B (en) | 2015-05-06 |
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Inventor after: Wang Jianzhong Inventor after: Lin Qingbo Inventor after: Chen Qingjin Inventor after: Lin Mao Inventor after: Chen Linyao Inventor after: Zhang Kesheng Inventor after: Xiao Zhijian Inventor after: Ding Feifei Inventor before: Lin Qingbo Inventor before: Chen Qingjin Inventor before: Lin Mao Inventor before: Chen Linyao Inventor before: Zhang Kesheng Inventor before: Xiao Zhijian Inventor before: Ding Feifei |