Construction method of soft surrounding rock four-line super-large section railway tunnel

A technology of super large cross-section and weak surrounding rock, applied in tunnels, tunnel lining, excavation, etc., can solve the problems of supporting subsidence deformation, speeding up construction period, etc.

Inactive Publication Date: 2019-01-01
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for a four-line super-large-section railway tunnel with weak surrounding rock, which can effectively control the deformation of the support structure and e

Method used

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  • Construction method of soft surrounding rock four-line super-large section railway tunnel
  • Construction method of soft surrounding rock four-line super-large section railway tunnel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] The present invention is realized through the following technical solutions, as figure 1 , figure 2 As shown, the construction method of the four-line super-large section railway tunnel with weak surrounding rock specifically includes the following steps:

[0129] Step S1: hole construction; specifically includes the following steps:

[0130] Step S11: Build a flat structure with a super large section in the soft rock, and use anchor cable frame beams to reinforce the slope; build a flat structure with a super large section tunnel in the soft rock, and use anchor cable frame beams to reinforce the slope to ensure the stability of the slope;

[0131] Step S12: adopt the advance support of the double-sided large pipe shed;

[0132] Step S13: Excavating the pilot pit with composite double side walls; construction is carried out after the slope body at the entrance is reinforced, the tensioning of the anchor cables is completed, and the construction of the large pipe she...

Embodiment 2

[0144] This embodiment is further optimized on the basis of the above embodiments. Further, in order to better realize the present invention, the step S11 specifically includes the following steps:

[0145] Step A1: drainage system construction;

[0146] Step A2: Slope brushing construction; specifically refers to: slope brushing is carried out from top to bottom, using large-scale mechanical equipment to brush the slope and manually repairing the slope; carrying out protective construction on the slope, one layer of slope brushing, and one layer of slope protection construction ;

[0147] Step A3: Anchor cable drilling construction; set up the drilling operation platform, and set up maintenance railings around the drilling operation platform; the hole opening deviation is not greater than 20cm, the hole depth is not less than the design length, the drilling direction is consistent with the design method, and the hole The direction deviation is not more than 1.5°; during the ...

Embodiment 3

[0179] This embodiment is further optimized on the basis of the above embodiments, and the step S12 specifically includes the following steps:

[0180] Step B1: guide pipe installation and construction;

[0181] Step B2: Concrete construction of the guide wall; specifically refers to: setting a φ133 guide sleeve in the guide wall, the guide sleeve and the guide wall are welded with an I20b I-shaped steel frame, and the outer insertion angle of the guide sleeve is 1°;

[0182] Step B3: Drilling platform construction; the drilling platform is erected by sensory scaffolding or filling;

[0183] Step B4: use a drilling rig for drilling construction; when the concrete strength of the guide wall reaches 75% of the design strength, carry out drilling construction; before drilling, the axis of the drill rod of the drilling rig is on a straight line with the axis of the set guide pipe; use low speed Low-pressure drilling, the drilling speed and wind pressure can be gradually adjusted ...

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Abstract

The invention discloses a construction method of a soft surrounding rock four-line super-large section railway tunnel. The construction method of the soft surrounding rock four-line super-large section railway tunnel specifically comprises the following steps that step S1, entering the tunnel for construction is carried out, specifically, step S11, a super-large section flat structure is constructed in soft rock, and a slope is reinforced by adopting an anchor cable frame beam, step S12, a double-side large pipe shed is used for advance support; and step S13, compound double-side wall pilot tunnel excavation is adopted, the construction is carried out after a slope body of an entrance of the cave is reinforced, and an anchor cable is tensioned and the construction of the large pipe shed iscompleted; S2, construction of a shallow buried section is carried out; specifically, the construction methods of excavation of the compound double-side wall pilot tunnel, supporting cable conversion, wall first and arch construction later are adopted in the large section shallow buried section of the soft rock; step S3, construction of a deep buried section is carried out; specifically, the construction methods of three-step excavation, replacing supporting with cables and integrally lining on one side of the wall are adopted in the large section deep buried section of the soft rock; and step S4, the anchor cable in the tunnel is constructed vertically upwards. The construction method of the soft surrounding rock four-line super-large section railway tunnel effectively solves the problemof initial support sinking deformation in the construction of the super-large section tunnel; and meanwhile, the construction period is effectively accelerated, and the construction cost is saved.

Description

technical field [0001] The invention relates to the technical field of large-scale underground engineering construction of soft rock super-large end-face railways, highways, and hydropower tunnels, and specifically relates to a construction method for four-line super-large-section railway tunnels in soft surrounding rock. Background technique [0002] With the rapid development of our railway construction, especially the high-speed railway, limited by mountainous terrain and urban construction conditions, more and more super-large section station tunnels will be built. [0003] Railway station tunnels are generally located at the entrance and exit of the tunnel. From the perspective of topography, they have experienced stages with different excavation mechanical characteristics, such as the entrance section, shallow buried section, and deep buried end. The terrain is from shallow to deep, and the geology is from good to bad. However, there is still no complete set of constru...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/10E21D20/00E21D20/02E21F16/02E21D11/38E02D17/20
CPCE02D17/20E21D9/04E21D11/10E21D11/38E21D20/003E21D20/02E21F16/02
Inventor 汤振亚梁朋刚张庆孙百峰
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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