Octagonal working pit supporting member and mounting and construction method thereof

Abstract

The invention discloses an octagonal working pit supporting member and a mounting and construction method thereof. The octagonal working pit supporting member comprises an octagonal working pit protection wall supporting member formed by butt joint, and a frame-shaped plate and a straight plate are connected through symmetrically distributed H-shaped steel cross braces; a working pit protection wall comprises an inner layer steel plate and an outer layer steel plate which are provided with steel plate stiffening ribs, and interlayer connecting pieces connected with adjacent interlayer working pit protection walls are arranged at the bottom of the working pit protection wall; and the H-shaped steel cross braces are connected with the working pit protection wall, the adjacent octagonal supporting members are connected through the interlayer connecting pieces, and pipe jacking or directional drilling working pit layer-by-layer excavation and reverse disassembly and recovery of the excavated octagonal supporting members are implemented. The supporting structure of the working pit can be excavated downwards from the ground in a layered mode, supporting members are recycled in a reverse layered mode, waste is reduced, accident risks such as difficult sinking, sudden sinking and inclined sinking in the construction process are avoided, and the octagonal working pit supporting member has the advantages of being repeatedly used, saving space, reducing cost, reducing energy consumption and being environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of urban construction engineering, in particular to an octagonal working pit supporting component and its installation and construction process when urban municipal pipelines are constructed by pipe jacking and directional drilling. Background technique [0002] With the development and construction of cities, the construction scale and types of various underground municipal infrastructure supporting pipelines and other underground structures and facilities have increased to varying degrees, and the number of above-ground buildings has also increased, resulting in tight urban underground space. At the same time, considering the urban traffic diversion caused by the construction site’s encroachment on the existing traffic space, the protection of underground and above-ground existing pipelines and structures, etc., the construction space is often restricted to varying degrees during the construction of other m...

AI Technical Summary

Problems solved by technology

[0005] 1. Reinforced concrete retaining wall is constructed by reverse construction method, excavating one layer from the ground (the depth does not exceed 2m) to support the first layer, the process is complicated (formwork support, pouring, maintenance, formwork removal, etc.), and the construction period is long

[0006] 2. Reinforced concrete caisson is poured and formed on site (barrel body), and soil is excavated and transported layer by layer from the shaft, so that the caisson gradually sinks under the action of its own weight, and then seals the bottom after reaching the predetermined design elevation, which is relatively construction technical requirements High, long construction period, difficult sinking, sudden sinking, partial sinking, etc. are prone to occur during construction, and the risk of accidents is high

[0007] 3. The reinforced concrete structure supported by the working pit can only be used once, which virtually increases the investment cost of the project and causes waste of resources

[0008] 4. After the construction of the working pit support structure is completed, only the reinforced concrete structure within 3.5m from the ground will be removed, and the rest will permanently exist underground, which will cause unnecessary waste of urban underground space, not only affect the natural environment, but also invade Subsequent construction space for underground pipelines

Images