Tunnel portal earth retaining device as well as underground pedestrian passageway construction system and method

Abstract

The invention provides a tunnel portal earth retaining device, which is used for utilizing a tube push bench and tube joints to conduct the construction of an underground pedestrian passageway, and the tunnel portal earth retaining device comprises an upper embedded steel plate which is arranged on the inner side upper end of a tunnel portal and a lower embedded steel plate which is arranged on the inner side lower end of the tunnel portal, a plurality of vertical profile steels which are vertically arranged are welded between the upper embedded steel plate and the lower embedded steel plate, every two adjacent vertical profile steels are connected with each other in a welding way through a transverse profile steel which is horizontally arranged, the vertical profile steels and the transverse profile steels form a plurality of square holes in the vertical direction, and the square holes are used for the tube joints and the tube push bench to pass through in construction. The vertical profile steels and the transverse profile steels are used for substituting H-shaped steels, the tube joints are pushed into earth by passing through the vertical profile steels and the transverse profile steels, so that not only can an earth retaining effect be realized, but also the defects caused by the gas cutting of a great number of profile steels can be avoided, and the tunnel portal earth retaining device as well as the underground pedestrian passageway construction system and method, which can improve the construction efficiency, reduce the construction difficulty and save the construction cost, are provided.

Description

technical field [0001] The invention relates to the field of building construction, in particular to the construction of an underground pedestrian passage. Background technique [0002] At present, the construction of pedestrian passages under roads and railways generally adopts non-excavation construction methods, which can be constructed without blocking traffic. Specifically, two foundation pits are first made on both sides of the road or railway, and the rectangular power head and the pipe joint at the back are placed in the foundation pit. Stretching forward leads to the foundation pit on the opposite side, so that the pipe joints cover the entire passage in this way, and finally replace the entire pipe joints with concrete box culverts to form a pedestrian passage. [0003] In actual construction, the foundation pit is dug down from the ground to a depth of 8m to 10m, and the pipe jacking machine and pipe joints are placed for construction. In order to prevent soil co...

AI Technical Summary

Problems solved by technology

The cross-section of the entire channel is calculated as 13.62mх7.6m, and the weight of the section steel to be cut is 87,000kg, and because the section steel is closely attached to the concrete surrounding the foundation pit, it is difficult to implement gas cutting, which greatly prolongs the construction period

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