A prefabricated recyclable pipe jacking well and its construction technology

Abstract

The invention provides an assembled recyclable pipe jacking working well, which includes a circular working well body, the circular working well main body includes a concrete blade foot assembly and a plurality of steel pipes stacked on the concrete blade foot assembly layer by layer from bottom to top. The side wall assembly, the steel side wall assembly is formed by splicing a plurality of steel side wall units along the circumferential direction through bolts, and the concrete blade foot assembly is formed by splicing a plurality of concrete blade foot units through the gate rib along the circumferential direction. The construction process is bottom-up assembly. Compared with the prior art, the present invention has the advantages of high degree of assembly, high unit adaptability, flexible opening position of pipe jacking in the well, simple connection mode, good soil support effect, and easier guarantee of safety; The resource utilization rate is high. After the construction is completed, all the steel side wall units can be recovered; after the temporary recovery of the construction, the soil in the working area can be restored as much as possible to protect the underground environment.

Description

technical field [0001] The invention relates to the technical field of pipe jacking well construction, in particular to an assembled recoverable pipe jacking well and its construction technology. Background technique [0002] At present, in urban municipal engineering, due to the limited environmental conditions, non-excavation pipe jacking construction operations are mostly used. The commonly used methods of pipe jacking work wells include reverse arch wall method, reinforced concrete caissons cast in place layer by layer , simple steel cylinder, steel plate (section steel) pile enclosure structure, etc., the specific methods are as follows: [0003] 1. Reverse arch wall method: The technical principle is to construct the support structure layer by layer from top to bottom, that is, dig a layer of earthwork from top to bottom along the excavation line of the working well, and then use the side wall of the excavation surface as the outer formwork , Binding steel bars, erect...

AI Technical Summary

Problems solved by technology

Disadvantages: 1. On-site production of steel bars and supporting formwork requires a lot of labor hours; 2. After the concrete reaches a certain strength, the enclosure structure can be formed to meet the construction requirements of the lower layer, and the construction period is long; 3. The construction quality of the temporary structure is difficult to control ;4. After the construction is completed, the supporting structure is buried underground as a permanent concrete structure, which wastes resources

Disadvantages: 1. The production cycle of the reinforced concrete structure produced on site is long; 2. The construction is more complicated, consumes more formwork, and the construction cost is high; 3. The concrete is easy to crack when it sinks unbalanced, causing local damage to the structure; 4. Work before pipe jacking The well needs to be drilled twice; 5. The structure of the pipe wall creates inconvenience to the subsequent underground construction at this place

[0006] 4. Steel plate (section steel) pile enclosure structure: This method is to use the support structure in the foundation pit project as the working well for pipe jacking, which is not a typical pipe jacking construction method, because the pipe jacking needs to open holes, and the steel plate The pile enclosure structure needs to be in a closed state. The two are contradictory. When opening holes, the treatment is often not standardized, and the soil may be in an unsupported state, which poses a safety risk.

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