Top pipe work pit supporting method

Abstract

The invention relates to a top pipe work pit supporting method. The method includes the following steps that firstly, construction preparation is made, field leveling is conduced according to the design elevation, setting out of pouring piles is conducted, pile spacing construction is conducted around a work pit, and ring-shaped row piles are formed; secondly, a high-pressure grouting water stop pile is constructed between every two adjacent pouring piles according to the geology and underwater distribution condition so that the high-pressure grouting water stop piles can be engaged with the pouring piles, and a closed water stop curtain is formed; thirdly, earthwork layered excavation is conducted in the work pit, after excavation is conducted till the design elevation of each layer is reached, ring beam construction is conducted, after ring beam construction of each layer reaches the design strength, excavation of the next layer of earthwork is conducted, and excavation is conductedtill the bottom of the work pit is reached; and fourthly, grouting and strengthening are conducted on the hole entering ground of a top pipe to form a hole inner lining wall, meanwhile, the position for the top pipe to enter the hole is reserved, cushion layer and rear seat wall combustion is conducted, top pipe equipment installation is conducted, and work pit construction is completed. The top pipe work pit supporting method has the beneficial effects that the structure is reliable, and top pipe construction is facilitated.

Description

technical field [0001] The invention relates to the technical field of foundation pit support, in particular to a method for supporting pipe jacking working pits. Background technique [0002] At present, in the construction of rainwater pipelines or sewage pipelines in municipal engineering, the pipe jacking method is usually used for construction. The jacking and burial of the pipeline requires a working space provided by the shaft, that is, a working pit. Under the limited space of the site, support measures must be taken for the working pit to ensure the safety of the earthwork excavation of the shaft and the subsequent pipeline construction. [0003] In the existing technology, the support form of the working pit at this stage is mainly determined by the pipe jacking process and the geological conditions of the site. For the hand-dug pipe jacking process, the equipment in the pit is relatively simple, and the requirements for the clearance of the top pit are not strict...

AI Technical Summary

Problems solved by technology

[0004] Especially for working pits in urban environments, there are many surrounding structures and complex underground conditions. For ultra-deep working pits, cast-in-place piles and internal support structure systems are used. Although the support is reliable, the working space is narrow due to the influence of the internal support system. It is not conducive to the hoisting space requirements of mechanical pipe jacking equipment and pipe installation

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