CN103486331A - Stuck pipe handling method in trenchless pipe construction - Google Patents
Stuck pipe handling method in trenchless pipe construction Download PDFInfo
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- CN103486331A CN103486331A CN201310415798.1A CN201310415798A CN103486331A CN 103486331 A CN103486331 A CN 103486331A CN 201310415798 A CN201310415798 A CN 201310415798A CN 103486331 A CN103486331 A CN 103486331A
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- pipe
- stuck
- pipeline
- cutting knife
- cut
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
Abstract
The invention discloses a stuck pipe handling method in trenchless pipe construction. The method includes sending a cutter into each stuck pipe by a drill stem of a drilling rig; rotating the cutter to cut off the stuck pipe after the cutter reaches the vicinity of the end of a dragging pipe so as to remove the stuck pipe from the dragging pipe; repeating the above steps until all the stuck pipes are cut off; pulling the stuck pipes from a drill outlet and a drill inlet as well as the drill stem from a drill hole; finishing handling of the stuck pipes. In trenchless horizontal directional drilling and pipe laying construction, the method can be used for handling accidents safely, quickly, efficiently and inexpensively when the drill stem, a back reamer and pipes are all buried due to the stuck pipes. Therefore, abandonment and reconstruction of projects are avoided, construction period is shortened, construction cost is lowered, and enormous economic and reputation loss can be retrieved. Further, development and modification of the trenchless horizontal directional drilling construction technology are greatly promoted, application range is enlarged and the stuck pipe handling method is of practical significance.
Description
Technical field
The present invention relates to a kind of method of construction in the Construction Technology research field, particularly relate to the processing method of blocking the event of running affairs in a kind of non-excavation horizontal directional drilling tubine construction.
Background technique
Because the In Guangdong Province complex geologic conditions is changeable, the Quaternary Strata sand content is larger, and degree of compaction is poor, and when carrying out non-excavation horizontal directional drilling tubine construction, the stability of borehole wall is very crucial.Return when a low-quality boring will cause hauling pipe and drag resistance to increase; And, in sand (gravel) when construction layer, collapse hole and fall gravel of borehole wall also usually appears, and while causing hauling pipe, pipeline is stuck or locking, returns to drag resistance extremely to increase, and exceeds returning of equipment and drag ability, and engineering faces failure.This kind of situation is commonly called as " card pipe " or " holding tube " accident
.once and accident treatment is unsuccessful, the drilling rod in hole, returns enlarging aiguille and pulled pipeline in hole into and will all be embedded in undergroundly, boring will be scrapped, project failure.
Now, except construction delay and unit in charge of construction's reputation impaired, economic loss is also often very huge.In certain engineering, 4 hole Φ 180HDPE electrical bushings pass through more than 200 meters wide rivers, use the horizontal directional drilling machine construction of imported from America, and the boring crossing length is 460 meters.When hauling pipe to 210 meter, occur in layer of sand that card is run affairs therefore, the pipeline of the drilling rod of 250 meters and 4 * 210 meters is embedded in underground, adds the drilling construction costs such as pilot hole, reaming, and the expense reformed after scrapping of engineering, direct loss are up to more than 1,500,000 yuan.
Therefore, find a kind of construction safety, technical feasibility, efficient quick and cheap card is run affairs thus processing method, there is huge economic benefit, social benefit and urgent realistic meaning.
Summary of the invention
Purpose of the present invention, be to provide the processing method of blocking the event of running affairs in non-excavation horizontal directional drilling tubine construction.
The solution that the present invention solves its technical problem is: the processing method of blocking the event of running affairs in a kind of non-excavation pipeline construction, utilize borer drill rod that a cutting knife is sent in the pipeline be stuck, behind near position cutting knife arrival pulling head, pass through rotary cutter, by the pipe cutting of this velamen card, make it to separate with pulling head; So repeated multiple times, until in the engineering of multitube hole, all pipelines that blocked all are cut off; Then from go out to bore end and enter to bore pipeline and the drilling rod that end will be blocked, in holing, pull out respectively, therefore complete the card processing of running affairs.
As further improvement in the technical proposal, it comprises the following steps,
1) after the generation card is run affairs event, first rig is separated with drilling rod, and rig is moved to out to the brill end from entering to bore end;
2) install one cutting knife at the front end of drilling rod;
3) intend the stuck pipe road cut off for selected one, utilize rig that drilling rod is sent in this pipeline;
4), in the time of near cutting knife arrives pulling head, rotary drill rod and cutting knife, by this pipe cutting, make it to separate with drilling rod with pulling head;
5) drilling rod and cutting knife are exited in this pipeline;
6) repeating step 2) to step 5), until all stuck pipes road all is cut off;
7) utilize rig power, all cut pipelines are pulled out successively from boring;
8) rig is retracted into the brill end, all drilling rods are pulled out from boring together with time enlarging aiguille, pulling head;
9) cleaning boring re-starts the hauling pipe construction in former boring, and accident treatment is complete.
As further improvement in the technical proposal, in step 2) in, described cutting knife is eccentric cutter, it is shaped as " ┓ " shape or " < " shape.
As further improvement in the technical proposal, in step 2) in, described cutting knife external diameter is generally less than internal diameter of the pipeline 15-20 millimeter.
As further improvement in the technical proposal, in step 2) in, described cutting knife is steel, and as required, can seting welding carbide on blade.
As further improvement in the technical proposal, in step 4), the cut-out point of described pipeline is generally 0.5-1.0 rice apart from pulling head.
As further improvement in the technical proposal, in step 7), at every turn from the pipeline number of pulling out in holing, be generally the 1-2 hole.
The invention has the beneficial effects as follows: in non-excavation horizontal directional drilling tubine construction, when the event of running affairs occurring blocking, may cause drilling rod, returning enlarging aiguille and pipeline all is embedded in underground, boring is scrapped, when engineering faces the tremendous economic loss, can carry out safety to accident, fast, efficiently, process cheaply, having avoided engineering to scrap reforms, shortened construction period, reduced construction cost, huge economy and reputation loss have been retrieved, thereby promoted widely the development and improvement of non-excavation horizontal directional drilling construction technology, widened its application area, there is realistic meaning.
The accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the present invention is further illustrated.
Fig. 1 is the schematic diagram that occurs in the present invention blocking while running affairs event, and rig is separated with drilling rod;
Fig. 2 is the schematic diagram utilized in the present invention after the cutting knife cutting out pipeline;
Fig. 3 is the schematic diagram after in the present invention, cut pipeline being pulled out successively from boring;
Fig. 4 is the schematic diagram after in the present invention, drilling rod being pulled out from boring together with time enlarging aiguille, pulling head, after cleaning boring, can re-start the hauling pipe construction in former boring, and accident treatment is complete;
Fig. 5 is when in the present invention, drilling rod does not rotate, cutting knife enters the schematic diagram in pipe together with drilling rod;
Fig. 6 is the schematic diagram of drilling rod when rotation in the present invention, cutting knife cutting inner-walls of duct.
Embodiment
Below in conjunction with accompanying drawing, describe application of the present invention in detail.
With reference to Fig. 1～Fig. 6, technological scheme of the present invention is to utilize the drilling rod 2 of rig 1 cutting knife 6 to be sent in the pipeline 5 be stuck, after cutting knife 6 arrives near the position of pulling head 4, by rotary cutter 6, the pipeline of this velamen card 5 is cut off, make it to separate with pulling head 4; So repeated multiple times, until all pipelines blocked 5 all are cut off; Then respectively from go out to bore end 9 and enter to bore end 8 pipelines 5 that will be blocked and drilling rod is pulled out from holing in 7, therefore complete the card processing of running affairs.
Basic principle of the present invention is: by cutting out pipeline 5, reduce the stratum frictional resistance.When occurring that card is run affairs thus after, due to returning of the boring 7 interior stratum maximum pull-back force of rig 1 that dragged resistance to exceed, cause rig 1 can't continue hauling pipe.And after pipeline 5 is cut off, return and drag resistance to be divided into two: drilling rod 2, return enlarging aiguille 3 and pulling head 4 parts, can be under the reaming effect of returning enlarging aiguille 3, on one side reaming from entering to bore end 8, pull out on one side.And the pipeline 5 blocked is oppositely pulled out from going out to bore end 9.Owing to being that every pipe disperses to pull out successively, the frictional resistance on stratum is also little, all in rig 1 limit of power.
The present invention is adapted to adopt the pore solitary of hdpe pipe (HDPE) or steel pipe or the horizontal directional drilling tubine construction project in multitube hole.
Be further used as preferred embodiment, comprise the following steps:
1) after the generation card is run affairs event, first rig 1 is separated with drilling rod 2, and rig 1 is moved to out to brill end 9 from entering to bore end 8;
2) install one cutting knife 6 at the front end of drilling rod 2;
3) intend the stuck pipe road 5 cut off for selected one, utilize rig 1 that drilling rod 2 is sent in this pipeline 5;
4), in the time of near cutting knife 6 arrives pulling head 4, rotary drill rod 2 and cutting knife 6, cut off this pipeline 5, makes it to separate with drilling rod 2 with pulling head 3;
5) drilling rod 2 and cutting knife 6 are exited in this pipeline 5;
6) repeating step 2) to step 5), until all stuck pipes road 5 all is cut off;
7) utilize rig 1 power, all cut pipelines 5 are pulled out from holing 7 successively;
8) rig 1 is retracted into brill end 8, all drilling rods 2 are pulled out from holing 7 together with returning enlarging aiguille 3, pulling head 4;
9) cleaning boring 7, re-start the hauling pipe construction in former boring, and accident treatment is complete.
Be further used as preferred embodiment, in step 2) in, described cutting knife 6 is eccentric cutter.Its eccentric incision principle is (seeing Fig. 5, Fig. 6): when drilling rod 2 does not rotate, because cutting knife 6 external diameters are less than pipeline 5 internal diameters, cutting knife 6 can be at the interior smooth advance and retreat of pipeline 5 (now drilling rod 2 be in the pipeline shaft core position); When drilling rod 2 rotation, cutting knife 6, under the effect of centrifugal force, be take drilling rod 2 as axis, is rotated, and turning radius is the cutting knife height, and the movement locus of blade is the twice turning radius in theory, is greater than internal diameter of the pipeline.Therefore, during the blade rotation, will be close to pipeline 5 madial walls, under the contact effect, pipeline 5 inwalls be cut.Rotating speed is faster, and the centrifugal force of cutter is larger, and the blade contact is also larger, cuts faster.
Be further used as preferred embodiment, in step 2) in, described cutting knife 6 be shaped as " ┓ " shape or " < " shape.For prevent that cutting knife from advancing time distortion, cutting knife 6 generally is not less than 90 degree with the angle of drilling rod 2 axis.
Be further used as preferred embodiment, in step 2) in, described cutting knife 6 external diameters are generally less than pipeline 5 internal diameter 15-20 millimeters, so that cutting knife 65 is advanced and retreat smoothly in pipe.
Be further used as preferred embodiment, in step 2) in, described cutting knife 6 is steel, and as required, can seting welding carbide on blade.When pipeline to be cut 5 is polyethylene pipe, adopt the steel cutting knife to get final product; When pipeline to be cut 5 is steel pipe, steel cutter blade palpus seting welding carbide, have good service behaviour to guarantee cutting knife.
Be further used as preferred embodiment, in step 4), the cut-out point of described pipeline 5 is generally 0.5-1.0 rice apart from pulling head 4.Cut-out point should be as far as possible near pulling head 4, and to shorten residual duct length thereafter, reduce returns and drags resistance.
Be further used as preferred embodiment, in step 7), at every turn from the pipeline number of pulling out of holing in 7, be generally the 1-2 hole.Generally for safety, should pull out 1 hole pipe at every turn, shorter at duct length, return and drag resistance hour, can consider to draw 2 pores.
More than that better embodiment of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite without prejudice to spirit of the present invention, and the modification that these are equal to or replacement all are included in the application's claim limited range.
Claims (7)
1. block the former processing method of running affairs in a non-excavation pipeline construction, it is characterized in that: utilize borer drill rod that a cutting knife is sent in the pipeline be stuck, behind near position cutting knife arrival pulling head, pass through rotary cutter, by the pipe cutting of this velamen card, make it to separate with pulling head; So repeated multiple times, until in the engineering of multitube hole, all pipelines that blocked all are cut off; Then from go out to bore end and enter to bore pipeline and the drilling rod that end will be blocked, in holing, pull out respectively, therefore complete the card processing of running affairs.
2. block the processing method of the event of running affairs in non-excavation pipeline construction according to claim 1, it is characterized in that: it comprises the following steps,
1) after the generation card is run affairs event, first rig is separated with drilling rod, and rig is moved to out to the brill end from entering to bore end;
2) install one cutting knife at the front end of drilling rod;
3) intend the stuck pipe road cut off for selected one, utilize rig that drilling rod is sent in this pipeline;
4), in the time of near cutting knife arrives pulling head, rotary drill rod and cutting knife, by this pipe cutting, make it to separate with drilling rod with pulling head;
5) drilling rod and cutting knife are exited in this pipeline;
6) repeating step 2) to step 5), until all stuck pipes road all is cut off;
7) utilize rig power, all cut pipelines are pulled out successively from boring;
8) rig is retracted into the brill end, all drilling rods are pulled out from boring together with time enlarging aiguille, pulling head;
9) cleaning boring re-starts the hauling pipe construction in former boring, and accident treatment is complete.
3. block the processing method of the event of running affairs in non-excavation pipeline construction according to claim 2, it is characterized in that: in step 2) in, described cutting knife is eccentric cutter, it is shaped as " ┓ " shape or " < " shape.
4. block the processing method of the event of running affairs in non-excavation pipeline construction according to claim 2, it is characterized in that: in step 2) in, described cutting knife external diameter is generally less than internal diameter of the pipeline 15-20 millimeter.
5. block the processing method of the event of running affairs in non-excavation pipeline construction according to claim 2, it is characterized in that: in step 2) in, described cutting knife is steel, and as required, can seting welding carbide on blade.
6. block the processing method of the event of running affairs in non-excavation pipeline construction according to claim 2, it is characterized in that: in step 4), the cut-out point of described pipeline is generally 0.5-1.0 rice apart from pulling head.
In non-excavation pipeline construction according to claim 2 card run affairs thus processing method, it is characterized in that: in step 7), at every turn from the pipeline number of pulling out in holing, be generally the 1-2 hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310415798.1A CN103486331B (en) | 2013-09-12 | 2013-09-12 | Stuck pipe handling method in trenchless pipe construction |
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| CN201310415798.1A CN103486331B (en) | 2013-09-12 | 2013-09-12 | Stuck pipe handling method in trenchless pipe construction |
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| CN103486331B CN103486331B (en) | 2015-07-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851257A (en) * | 2014-03-18 | 2014-06-11 | 国家电网公司 | Paired cable duct bank laying-based support pipe construction process |
| CN108119148A (en) * | 2017-12-20 | 2018-06-05 | 中铁十八局集团有限公司 | Push pipe card pipe is got rid of poverty processing method in a kind of constructing tunnel |
| CN109236223A (en) * | 2018-11-12 | 2019-01-18 | 南京理工大学 | A kind of on-line automatic kickoff mechanism of no-dig technique drilling tool |
| CN110274088A (en) * | 2019-05-31 | 2019-09-24 | 武汉市武昌市政建设(集团)有限公司 | A kind of road construction non-excavation type inspection shaft pipeline construction method |
| CN111622771A (en) * | 2020-06-30 | 2020-09-04 | 广东省第一建筑工程有限公司 | Top-pull drill pipe and construction equipment comprising same |
| CN114109401A (en) * | 2022-01-25 | 2022-03-01 | 北京城建轨道交通建设工程有限公司 | Non-excavation dragging pipe pulling construction process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2226979A1 (en) * | 1995-07-17 | 1997-02-06 | Nowak Construction Co., Inc. | Method for replacing buried pipe |
| CN1602386A (en) * | 2001-12-11 | 2005-03-30 | 国际壳牌研究有限公司 | Method of freeing stuck drill pipe |
| CN201071695Y (en) * | 2007-10-17 | 2008-06-11 | 大庆油田有限责任公司 | Shock dispelling clip tubular pole for near clip point of continuous oil pipe |
| CN102003140A (en) * | 2010-10-20 | 2011-04-06 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| WO2011095324A1 (en) * | 2010-02-03 | 2011-08-11 | Herrenknecht Ag | Method for the trenchless laying of pipelines |
| CN102434716A (en) * | 2011-09-26 | 2012-05-02 | 武汉地网非开挖科技有限公司 | Flexible pipe assisted type pipeline returning method |
| CN103234076A (en) * | 2013-04-02 | 2013-08-07 | 中冶交通工程技术有限公司 | Device for exchanging underground pipelines without trenching and application method thereof |
| CN203188904U (en) * | 2013-04-17 | 2013-09-11 | 王茂华 | Drilling machine for non-excavation construction |
-
2013
- 2013-09-12 CN CN201310415798.1A patent/CN103486331B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2226979A1 (en) * | 1995-07-17 | 1997-02-06 | Nowak Construction Co., Inc. | Method for replacing buried pipe |
| CA2226979C (en) * | 1995-07-17 | 2001-02-06 | Nowak Construction Co., Inc. | Method for replacing buried pipe |
| CN1602386A (en) * | 2001-12-11 | 2005-03-30 | 国际壳牌研究有限公司 | Method of freeing stuck drill pipe |
| CN201071695Y (en) * | 2007-10-17 | 2008-06-11 | 大庆油田有限责任公司 | Shock dispelling clip tubular pole for near clip point of continuous oil pipe |
| WO2011095324A1 (en) * | 2010-02-03 | 2011-08-11 | Herrenknecht Ag | Method for the trenchless laying of pipelines |
| CN102003140A (en) * | 2010-10-20 | 2011-04-06 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| CN102434716A (en) * | 2011-09-26 | 2012-05-02 | 武汉地网非开挖科技有限公司 | Flexible pipe assisted type pipeline returning method |
| CN103234076A (en) * | 2013-04-02 | 2013-08-07 | 中冶交通工程技术有限公司 | Device for exchanging underground pipelines without trenching and application method thereof |
| CN203188904U (en) * | 2013-04-17 | 2013-09-11 | 王茂华 | Drilling machine for non-excavation construction |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851257A (en) * | 2014-03-18 | 2014-06-11 | 国家电网公司 | Paired cable duct bank laying-based support pipe construction process |
| CN103851257B (en) * | 2014-03-18 | 2015-10-28 | 国家电网公司 | Based on the trustship construction process in laying cable duct bank |
| CN108119148A (en) * | 2017-12-20 | 2018-06-05 | 中铁十八局集团有限公司 | Push pipe card pipe is got rid of poverty processing method in a kind of constructing tunnel |
| CN109236223A (en) * | 2018-11-12 | 2019-01-18 | 南京理工大学 | A kind of on-line automatic kickoff mechanism of no-dig technique drilling tool |
| CN110274088A (en) * | 2019-05-31 | 2019-09-24 | 武汉市武昌市政建设(集团)有限公司 | A kind of road construction non-excavation type inspection shaft pipeline construction method |
| CN111622771A (en) * | 2020-06-30 | 2020-09-04 | 广东省第一建筑工程有限公司 | Top-pull drill pipe and construction equipment comprising same |
| CN111622771B (en) * | 2020-06-30 | 2021-01-26 | 广东省第一建筑工程有限公司 | Top-pull drill pipe and construction equipment comprising same |
| CN114109401A (en) * | 2022-01-25 | 2022-03-01 | 北京城建轨道交通建设工程有限公司 | Non-excavation dragging pipe pulling construction process |
| CN114109401B (en) * | 2022-01-25 | 2022-04-15 | 北京城建轨道交通建设工程有限公司 | Non-excavation dragging pipe pulling construction process |
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