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Underground structure of municipal pipeline group spanning tunnel and construction method for underground structure

A technology for underground structures and pipeline groups, applied to underwater structures, infrastructure engineering, artificial islands, etc., can solve problems such as slow project progress, long construction period, tunnel impact, etc., and achieve fast construction progress, high work efficiency, Controlling the effect of tunnel heave deformation

Active Publication Date: 2016-06-15
ZHONGCHUAN NO 9 DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the construction period is long and the progress of the project is slow. At the same time, when the foundation is reinforced and the pile foundation is constructed, the construction itself has a great impact on the tunnel.

Method used

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  • Underground structure of municipal pipeline group spanning tunnel and construction method for underground structure
  • Underground structure of municipal pipeline group spanning tunnel and construction method for underground structure
  • Underground structure of municipal pipeline group spanning tunnel and construction method for underground structure

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Directly below the foundation pit of the municipal pipeline project is the subway tunnel in operation, which is less than 6m away from the box structure that crosses the municipal pipeline of the subway tunnel. The specific construction steps are as follows:

[0022] (1) Foundation pit enclosure

[0023] See attached figure 1 According to the design requirements, the buried pipe area across the tunnel is determined, and the foundation pit enclosure is carried out according to the determined pipe buried area. On both sides of the north side are cast-in-place piles for the well, and three-axis mixing piles 8 are used for protection. The east and west sides of the foundation pit are protected by gravity dams 7. The underground structure of the municipal pipeline group spanning the subway tunnel 2 is a number of U-shaped grooves 4, A box-shaped structure formed by assembling the bottom plate 5 and the cover plate 6.

[0024] (2) Slot segment division

[0025] See attache...

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Abstract

The invention discloses an underground structure of a municipal pipeline group spanning tunnel and a construction method for the underground structure. The construction method is characterized in that the municipal pipeline group underground structure is excavated by adopting a construction method of strip-divided and block-divided pouring in a spacing manner, and a pipe section, which is assembled by a U-shaped slot prefabricated by reinforced concrete or a bottom plate and a cover plate, of a box-type structure is quickly hoisted, and bagged sand is piled up on the pipe section structure to compensate unloading caused by earth excavation, so that zero unloading during a pipeline mounting group construction period is realized, and heave deformation of an inferior subway tunnel is controlled. The specific construction of the construction method comprises the steps such as bracing of a foundation pit, earth excavation, pipeline mounting and the like. Compared with the prior art, the construction method controls the heave deformation of the pit bottom and the subway tunnel, has small influence on a surrounding environment, has high working efficiency and has low engineering risk, and is especially suitable for a soft soil area, so that environmental adverse effect caused by excavation of the foundation pit is reduced to be lowest, and the tunnel heave deformation caused by soil unloading is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of municipal engineering underground space, in particular to an underground structure and a construction method for a group of municipal pipelines spanning tunnels in soft soil areas. Background technique [0002] With the rapid development of urban underground space and the improvement of the rail transit network, the conflict between existing subway tunnels and new projects has become increasingly prominent, and the excavation of foundation pits above the operating subway tunnels has continued to appear, which will give rise to the design of underground projects. , Construction has brought new problems. The unloading and uplift of the foundation pit soil will cause the underlying strata to move, and in severe cases, it will cause the subjacent tunnel to uplift and threaten the safety of subway operation. The deformation protection requirements for the normal operation of subway shield tunnels are very str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/045
CPCE02D29/045E02D29/10
Inventor 王鑫周竝李昀金国龙王勇顾开云汪贵平林靖
Owner ZHONGCHUAN NO 9 DESIGN & RES INST
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