An enclosure for buried placement near grade capable of supporting vehicle loading having a reinforced cover, walls and base, the walls including internal struts and stabilizers, the cover and walls including notches for transferring load and grooves for limiting translation and rotation of the cover...http://www.google.es/patents/US5791098?utm_source=gb-gplus-sharePatente US5791098 - Reinforced structure for below-grade housing of equipment
Reinforced structure for below-grade housing of equipment
