A construction device and method for super-long pipe curtain jacking without intermediate space

Abstract

The invention discloses an intermediate-jacking-station-free jacking construction device of an ultra-long pipe roof and a method thereof. The device comprises a tunnel portal pressurizing device and a pipe roof steel pipe, wherein the tunnel portal pressurizing device comprises a soil body, a jet-grouting pile and a grouting pipe; the jet-grouting pile and the grouting pipe are arranged outside the soil body; the jet-grouting pile is as a sealed waterproof wall; a steel protection cylinder is arranged in the jet-grouting pile; an outer end of the steel protection cylinder is orderly provided with a sealing rubber ring and a steel plate ring; a blind plate connected with the grouting pipe is arranged outside the steel plate ring. A lubricating grouting hole and a grouting connection and control device are arranged on the steel pipe of the pipe roof to reduce jacking resistance, at the same time, pressure of 0.1-0.5 mPa is formed in a 35 mm gap between a soil hole and peripheries of the pipe so as to resist deformation of a soil cave, and achieve the purpose of controlling settlement of a road face above the soil cave. The device and the method provided by the invention have the advantages that negative factors caused by an intermediate jacking station structure in use are removed on the basis of carrying out the intermediate-jacking-station-free jacking method; the problem that jacking construction of the ultra-long pipe roof is difficult is solved; the jacking force for construction is small; the construction precision is high; and the settlement degree is low.

Description

technical field [0001] The invention relates to the field of tunnel construction and pipe curtain support, in particular to an ultra-long pipe curtain jacking construction device and method without intermediate spaces. Background technique [0002] The current pipe curtain construction method commonly used in tunnel construction is a kind of non-excavation technology. As a construction method of using small-diameter pipe jacking machines to construct large-section underground spaces, it has developed for 20 years abroad. It has been developed in Japan, the United States, and Singapore. And China, etc. are used to cross roads. Excavation projects under railways, structures, airports, etc. have achieved good results and accumulated a certain amount of construction experience. The method is applicable to various formations such as backfill, sandy soil, clay, and rock formations. [0003] The pipe curtain construction method is based on single-pipe jacking, and the single pipe...

AI Technical Summary

Problems solved by technology

[0004] 1. The relay room is easily damaged during the frequent contraction jacking process, resulting in insufficient power, the pipe curtain cannot be jacked normally, and the pipe jacking fails

[0005] 2. Due to the frequent contraction of the relay room, the closed system of the relay room is easily damaged, resulting in the leakage and pressure loss of the drag-reducing mud on the outer wall of the pipe, which may cause the increase of the resistance of the pipe curtain and the phenomenon of pipe holding

[0006] 3. The problem of jacking force cannot be fundamentally solved, the control of jacking direction is difficult, and the deviation of jacking accuracy is large

[0007] 4. The large jacking deviation and the loss of pressure between the relays will cause large soil settlement, which cannot meet the construction of high-standard settlement control parts

[0008] 5. The cost of the relay room is high, and the construction cost increases

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