Pipe group isolation pipe-jacking construction method

Abstract

The invention discloses a pipe group isolation pipe-jacking construction method, which is suitable for structures sensitive to deformation on the ground. The method comprises the following steps thatfirstly, a plurality of seamless steel tube guide pipes are pre-buried in a side wall of a pipe-jacking originating well; secondly, a plurality of seamless steel pipes are arranged above a corresponding jacking pipe through a miniature pipe jacking technology, and therefore a rib pipe group is formed; each seamless steel pipe extends out of an originating well along the corresponding seamless steel pipe guide pipe and penetrates into a receiving well of the jacking pipe; thirdly, after the seamless steel pipes are arranged, slurry is injected into each seamless steel pipe; after the slurry issolidified, the construction of the rib pipe group is completed; and finally, construction of the jacking pipe is conducted. The construction method gives consideration to economical efficiency and practicability, and disturbance to an upper soil body can be effectively isolated during pipe jacking construction under the condition that the upper soil body of a pipe jacking section is not excavatedor damaged, influence of construction on the surrounding environment is reduced, the tunnel burial depth is decreased, the underground space is saved, and therefore remarkable social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of underground pipe jacking engineering, in particular to a pipe group isolated pipe jacking construction method. Background technique [0002] The pipe jacking method is a construction method that has little impact on ground structures, and the impact on the ground surface is often controlled by controlling the thickness of the soil above the pipe jacking. However, as the size of the pipe jacking section becomes larger and larger, controlling the deformation by thickening the cover soil thickness will bring the following unfavorable factors: [0003] (1) The thickness of the segment increases due to the increase of the covering soil; [0004] (2) As a result, the open-cut and buried sections of pipe jacking wells and tunnels are lengthened, and the excavation depth is increased, which directly increases the project risk and cost; [0005] (3) lead to taking more valuable urban underground space. [0006]...

AI Technical Summary

Problems solved by technology

[0003] (1) The thickness of the segment increases due to the increase of the covering soil;

[0004] (2) As a result, the open-cut and buried sections of pipe jacking wells and tunnels are lengthened, and the excavation depth is increased, which directly increases the project risk and cost;

[0005] (3) lead to take up more valuable urban underground space

[0008] (1) High cost;

[0009] (2) As the supporting structure of the construction stage, the pipe curtain must be designed to be relatively strong, but it will lose its function after the construction of the permanent structure is completed, which is wasteful

[0010] (3) Jacking is also required for pipe curtain construction, and its size is relatively large, generally about 800-1000mm in diameter, which also affects the ground surface

[0011] (4) Flower pipe grouting must be used in the construction of pipe curtains to form a strong vertical support structure, but the grouting itself is easy to cause deformation of the ground surface

Images