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Construction method for blocking super-large-diameter tunnel under water-rich stratum

A technology for super-large diameter, water-rich strata, which is used in earth-moving drilling, infrastructure engineering, mining equipment, etc., can solve problems such as difficulty in completing plugging, and achieve the effects of reducing potential safety hazards, saving construction costs, and avoiding damage.

Pending Publication Date: 2021-07-30
ZHENGZHOU ENG CO LTD CHINA RAILWAY SEVENTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a variety of existing pipeline sealing methods, but none of the sealing objects are for the super-large diameter pipeline mentioned above. When the sealing area of ​​the pipeline increases, the risk in the sealing process will increase exponentially, and it is difficult to complete the sealing

Method used

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  • Construction method for blocking super-large-diameter tunnel under water-rich stratum
  • Construction method for blocking super-large-diameter tunnel under water-rich stratum
  • Construction method for blocking super-large-diameter tunnel under water-rich stratum

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Embodiment 1

[0026] Such as figure 1 As shown, when a certain station of Metro Line 2 in a certain city is being constructed, the tunnel 1 will pass through first, and then the main body of the station will be constructed. The underground water level m of the above-mentioned station location is about 7 meters below the ground, while the shield segment of tunnel 1 has a diameter of 6.25 m, a wall thickness of 35 cm, and a buried depth of about 9 meters below the ground, and the shield segment and the station enclosure Conflicting pile positions. If the tunnel 1 is not blocked, a large amount of drilling mud will be lost during the construction of the surrounding piles of the station, so that the concrete of the surrounding piles cannot be poured to the design elevation. At the same time, a large amount of sand and groundwater will flow into the tunnel 1, affecting the tunnel. 1 for later use. Therefore, the shield tunnel 1 needs to be sealed before constructing the station enclosure piles...

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Abstract

The invention discloses a construction method for blocking a super-large-diameter tunnel under a water-rich stratum. The construction method includes the steps that (1) a tunnel plugging section is determined according to a construction plan, and a plugging pile excavation mark is made corresponding to the central position of the plugging section on the ground through surveying and setting out; (2) two dewatering wells are constructed from the ground downward for stratum dewatering, the above dewatering wells are located on both sides of the tunnel near the plugging pile, and the depth of the dewatering wells is up to the bottom of the tunnel; (3) the plugging pile is constructed according to the marked position, and the depth of the plugging pile reaches the top of the tunnel; (4) holes are drilled in the plugging pile, pump pipe is inserted into the plugging pile, and the tail end of the pump pipe extends into the tunnel; and (5) a formwork and a supporting system are mounted in the tunnel, then plugging section concrete is poured through the pump pipe, and construction is completed. The construction method for blocking the super-large-diameter tunnel under the water-rich stratum is simple, easy to implement, safe and reliable, a large amount of water can be prevented from flowing into a pipeline, underground water and the pipeline are well isolated, the pipeline can be prevented from cracking and being damaged, the integrity of the pipeline is ensured, and potential safety hazards are reduced.

Description

technical field [0001] The invention relates to the technical field of underground pipeline plugging construction, in particular to a construction method for plugging super-large-diameter tunnels under water-rich formations. Background technique [0002] In water-rich formations with high groundwater levels, if super-large-diameter reinforced concrete pipes (with a diameter of more than 6m) are buried in the early stage, construction needs to be carried out in a part of the area above the pipes in the later stage. When entering the pipeline, it is usually necessary to block the super-large pipeline before construction. At the same time, corresponding measures must be taken to ensure that the pipeline outside the construction area is not damaged. There are various ways to block the existing pipelines, but none of them are for the super large diameter pipelines mentioned above. When the sealing area of ​​the pipeline increases, the risk in the process of sealing increases expo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/103E02D19/10E02D19/18
CPCE21F17/103E02D19/10E02D19/18E02D2250/003Y02E10/20
Inventor 黄书剑毛丹峰赵建兵梁岩周培杰李宁刘浩雷勇施顺达建政董晓林王鹏飞张旭王军鹏
Owner ZHENGZHOU ENG CO LTD CHINA RAILWAY SEVENTH GRP
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