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Tunnel Construction Method for Ice-Water Deposit

A tunnel construction and stacking technology, which is applied in the construction field of tunnel engineering, can solve problems such as construction difficulties, side wall collapse, and poor stability, and achieve the effects of avoiding multiple renovations, reducing project cost, and ensuring force bearing

Active Publication Date: 2020-06-09
RAILWAY NO 5 BUREAU GRP FIRST ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to poor surrounding rock, shallow buried depth, and poor stability, tunnel excavation is prone to problems such as block falling and side wall collapse, so construction is extremely difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The tunnel construction method of ice-water accumulation body comprises the following steps:

[0033] (1) Advance support construction; the advance support of the tunnel adopts Φ45X6 small conduit support, which is constructed within the range of 110°-115° in the arch, with a single length of 5-5.5m, elevation angle α=12-14°, and circumferential direction Spacing 40-45cm, vertical spacing 170-180cm;

[0034] (2) Determine the tunnel excavation sequence; the tunnel is divided into 4-5 steps according to the height from top to bottom for excavation, the height of each step is equal, and each step is excavated from the center to the left and right sides at the same time For excavation, the distance between each step along the tunnel extension direction is greater than the height of each step;

[0035] (3) Excavate the uppermost step of the tunnel; excavate the uppermost step from the center to the left and right sides at the same time, and then spray a layer of concrete e...

Embodiment 2

[0051] The tunnel construction method of ice-water accumulation body comprises the following steps:

[0052] (1) Advance support construction; the advance support of the tunnel adopts Φ45X6 small conduit support, which is constructed within the range of 110°-115° in the arch, with a single length of 5-5.5m, elevation angle α=12-14°, and circumferential direction Spacing 40-45cm, vertical spacing 170-180cm;

[0053] (2) Determine the tunnel excavation sequence; the tunnel is divided into 4-5 steps according to the height from top to bottom for excavation, the height of each step is equal, and each step is excavated from the center to the left and right sides at the same time For excavation, the distance between each step along the tunnel extension direction is greater than the height of each step;

[0054] (3) Excavate the uppermost step of the tunnel; excavate the uppermost step from the center to the left and right sides at the same time, and then spray a layer of concrete e...

Embodiment 3

[0073] The tunnel construction method of ice-water accumulation body comprises the following steps:

[0074] (1) Advance support construction; the advance support of the tunnel adopts Φ45X6 small conduit support, which is constructed within the range of 110°-115° in the arch, with a single length of 5-5.5m, elevation angle α=12-14°, and circumferential direction Spacing 40-45cm, vertical spacing 170-180cm;

[0075] (2) Determine the tunnel excavation sequence; the tunnel is divided into 4-5 steps according to the height from top to bottom for excavation, the height of each step is equal, and each step is excavated from the center to the left and right sides at the same time For excavation, the distance between each step along the tunnel extension direction is greater than the height of each step;

[0076] (3) Excavate the uppermost step of the tunnel; excavate the uppermost step from the center to the left and right sides at the same time, and then spray a layer of concrete e...

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Abstract

A tunnel construction method for ice-water deposits, comprising the following steps: (1) Advance support construction; (2) Determining the tunnel excavation sequence; (3) Excavating the uppermost step of the tunnel; (4) Initial stage of the uppermost step Support; (5) Fixing of the arch foot; (6) Re-spray the second concrete layer; (7) Repeat steps (4)-(6) to complete the excavation and primary support construction of the next step; (8) Repeat step (7) until the excavation and primary support construction of the lowest step is completed; (9) inverted arch construction; (10) second lining construction above the inverted arch. The method of the invention ensures the stability of surrounding rock, ensures safe and effective tunnel construction, and can greatly save costs and improve construction progress under the premise of ensuring safety and quality.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a tunnel construction method for ice-water deposits. Background technique [0002] With the continuous improvement of the level of science and technology and construction technology, there will be more and more projects to build long tunnels in high-altitude seasonal frozen soil areas. [0003] Due to the action of Quaternary glaciers, ice-water deposits are particularly concentrated in the Qinghai-Tibet Plateau and its sub-regions. These ice-water deposits of different sizes, different characteristics, and complex structures are common in the Yarlung Zangbo River and its tributaries, the middle and upper reaches of the Jinsha River and other river basins under construction and to be built in highway projects and tunnel construction. The overall structure of the ice-water accumulation body is loose, the lithology is poor, and the self-stabilization abilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10E21D11/18E21D11/30E21D20/00E21D20/02E21D11/38E21F16/02
CPCE21D9/00E21D11/10E21D11/105E21D11/18E21D11/30E21D11/38E21D20/00E21D20/02E21F16/02
Inventor 朱胥仁彭学军肖丙辰汤宇杨文国杨俊峰杨曾李一萍方星桦彭雨杨钟东谭鹰童昌何林云林巍杰陈鹏范辉
Owner RAILWAY NO 5 BUREAU GRP FIRST ENG CO LTD
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