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Three-bench four-step staggered construction method for large section soft formation tunnel

A technology of weak ground and construction methods, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as short steps, unfavorable mechanized operations, temporary support reduces construction efficiency, large settlement and convergence deformation, etc., to achieve reduction The sinking and convergence of the vault, shortening the time of closing and forming a loop, and reducing the effect of exposure time

Inactive Publication Date: 2019-09-13
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional "three-step seven-step excavation method" has short steps and short left-right stagger distance of the middle steps. Due to the uncertainty of rock mass occurrence, it is easy to cause multiple steel frames to be exposed in the air at the same time after excavation, which affects the construction. Safety
Secondly, the construction process is cumbersome, the flow operation efficiency between each process is low, and the short length of the steps is not conducive to mechanized operation, the time for the initial support to be closed and formed into a ring is long, and the settlement and convergence deformation are relatively large
[0003] Although the "three-step temporary inverted arch method" can control the deformation of the initial support better, it increases the temporary support and reduces the construction efficiency, and the large-scale mechanical movement above the temporary inverted arch often has a greater impact on the initial support; demolition For temporary inverted arches, blasting is often used, which is equivalent to increasing the number of disturbances to the weak surrounding rock, and setting up temporary support increases the construction cost

Method used

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  • Three-bench four-step staggered construction method for large section soft formation tunnel
  • Three-bench four-step staggered construction method for large section soft formation tunnel
  • Three-bench four-step staggered construction method for large section soft formation tunnel

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A three-step and four-step staggered construction method for large-section soft ground tunnels, such as figure 1 As shown, it includes an upper step 1, a middle step 2, and a lower step 3 arranged in sequence, and the right side of the upper step 1, the middle step 2, and the left side of the lower step 3 constitute the first working plane; the upper step 1, The left side of the middle step 2 and the right side of the lower step 3 form the second working plane; the same side of the middle part of the upper step 1 and the middle step 2 is respectively provided with core soil 4; mainly includes the following steps:

[0043] Step 1: The first working plane and the second working plane are alternately constructed, and progressive construction is adopted; each pair of the first working plane and the second working plane is constructed once as a cycle; the first working plane and the second working plane Synchronous construction is adopted respectively in

[0044] Step 2: Ca...

Embodiment 2

[0049] This embodiment is further optimized on the basis of Embodiment 1. The construction of the first working plane and the second working plane in the step 1 includes the following steps respectively:

[0050] Step 01: Carry out drilling and blasting operations on the corresponding construction surfaces of upper step 1, middle step 2, and lower step 3;

[0051] Step 02: Then, remove slag from the construction surface of the upper step 1;

[0052] Step 03: Support the upper step 1, and remove slag from the corresponding construction surfaces of the middle step 2 and lower step 3;

[0053] Step 04: Finally, spray anchors to the upper step 1, support and spray anchors to the corresponding construction surfaces of the middle step 2 and lower step 3 respectively.

[0054] In step 1 of the present invention, the first working plane and the second working plane are alternately constructed on the construction surface through the method of steps 01-04, which shortens the cycle time...

Embodiment 3

[0057] This embodiment is further optimized on the basis of embodiment 2, as figure 2 As shown, the excavator is used to process the residues of the blasting section. Firstly, the residues of the upper step 1 are removed to the corresponding construction surfaces of the middle step 2 and the lower step 3, so that the corresponding construction of the upper step 1, middle step 2, and lower step 3 The surfaces are gently sloped. The steel frame is transported to the upper step 1, and the erection operation is carried out on the upper step 1. While the upper step 1 is erected, the excavator is used to sequentially excavate the slag at the gentle slopes of the middle step 2 and the lower step 3. After the erection of the upper step 1 is completed, the air duct and water pipe are connected, and the construction of the system anchor rod, the locking foot anchor rod, and the small conduit in advance is carried out, and the erection operation is carried out on the middle step 2; The...

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Abstract

The invention discloses a three-bench four-step staggered construction method for a large section soft formation tunnel. The three-bench four-step staggered construction method for the large section soft formation tunnel mainly comprises the following steps that 1,a first working plane and a second working plane are constructed in a staggered, and a progressive type construction is adopted; one time construction of each pair of the first working plane and the second working plane is as take as one cycle; and the first working plane and the second working plane adopt synchronous construction respectively; 2, after every two cycles of the first working plane and second working plane are constructed, a third working plane is constructed once; 3,every time when an upper bench is excavated for3 m, a tunnel bottom is constructed; the excavation length of each tunnel bottom construction is 3 m, and after the excavated tunnel bottom, the construction of an inverting arch and a secondary lining is carried out. According to the three-bench four-step staggered construction method for a large sectionsoft formationtunnel, the complicated process of traditional construction is simplified, and the work efficiency is improved through the four-step staggered construction of the first working plane, the second working plane, core soil, and the construction surface of the tunnel bottom on threebenches.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a three-step and four-step staggered construction method for a tunnel with a large cross-section and weak ground. Background technique [0002] The rock quality of the weak surrounding rock with large sections is relatively soft, the compressive strength is not high, the joints and fissures are relatively developed, the rock mass is relatively broken, the stability of the surrounding rock is poor, and landslides are prone to occur. The traditional "three-step seven-step excavation method" has short steps and short left-right stagger distance of the middle steps. Due to the uncertainty of rock mass occurrence, it is easy to cause multiple steel frames to be exposed in the air at the same time after excavation, which affects the construction. Safety. Secondly, the construction process is cumbersome, the flow operation efficiency between each process is low,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/10E21D9/12E21D11/10E21D21/00
CPCE21D9/006E21D9/10E21D9/12E21D11/105E21D21/00
Inventor 汤振亚何十美梁朋刚孙百峰
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
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