Construction method for RJP utilized reversely built enclosure structure

Abstract

The invention relates to the field of foundation pit engineering enclosure structure construction, in particular to a construction method for a RJP utilized reversely built enclosure structure. The method comprises the following steps that grouting reinforcement treatment is conducted on surrounding stratums of an existing pile foundation and an existing bearing platform within the foundation pitengineering influence range through sleeve valve pipes; RJPs are constructed on the side, invading the enclosure structure, of the existing pile foundation; secant pile enclosure structures on the twosides of the existing pile foundation are constructed, and it is ensured that reinforced concrete piles are occluded with the RJPs; a soil body around the existing pile foundation is excavated, and anewly-added pile foundation and a newly-added bearing platform are constructed; and the site is restored, and other secant piles and foundation pit side walls are constructed. The construction of thefoundation pit enclosure structure can be completed under the condition of intrusion of the adjacent existing pile foundation, the stratum reinforcing strength requirement is met, the waterproof andstress problems are solved, the pile forming quality can be effectively guaranteed, disturbance to an existing building (structure) can be effectively reduced, and sedimentation and deviation of surrounding stratums and pipelines are effectively controlled.

Description

technical field [0001] The invention relates to the field of maintenance structure construction of foundation pit engineering, in particular to a construction method of using RJP piles to reversely construct an enclosure structure. Background technique [0002] Land resources are scarce in cities, and existing buildings (structures) are densely distributed, and various pipelines, pile foundations of buildings, backfilled construction waste, etc. are also densely distributed underground. The complex construction conditions and geological conditions in the city have brought great challenges to the construction safety and construction quality of foundation pit engineering. restrictions, such as existing viaduct pile foundations, caps intruding into the boundary of the enclosure structure, etc. The main technical problems encountered are: ① The pile foundation or operating pipeline of the existing building (structure) invades the boundary of the foundation pit, and the construc...

AI Technical Summary

Problems solved by technology

The main technical problems encountered are: ① The pile foundation or operating pipeline of the existing building (structure) invades the boundary of the foundation pit, and the construction of the enclosure structure cannot be carried out; ② The excavation of the foundation pit will affect the The same existing buildings (structures) will bring huge risks to the construction of the foundation pit enclosure structure; ③Underground geological conditions are complex and changeable, and the support strength is high; ④Underground foundation pits The project has higher requirements on the waterproof performance of the enclosure structure

[0003] At present, the construction methods of foundation pit enclosure structure and foundation reinforcement methods generally used are only suitable for the ground reinforcement and water-stop requirements of conventional foundation pits, but for the situation adjacent to existing buildings (structures), the reinforcement strength cannot meet the conditions. It is also impossible to carry out subsequent excavation of the foundation pit.

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