Supporting structure for large-section weak surrounding rock tunnel construction and construction method thereof

A technology for weak surrounding rock and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of inability to use large-scale mechanical operations, high construction costs, and high risk of dismantling braces. The effect of construction efficiency and process connection

Active Publication Date: 2017-02-15
THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has the characteristics of cumbersome process, high process requirements, inability to use large-scale mechanical operations, slow construction speed, high construction cost, and high risk of dismantling.

Method used

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  • Supporting structure for large-section weak surrounding rock tunnel construction and construction method thereof
  • Supporting structure for large-section weak surrounding rock tunnel construction and construction method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: as Figure 1-Figure 2 As shown, a support structure for the construction of tunnels with large cross-sections and weak surrounding rocks, including steel arches 2, steel arches 2 are formed by a plurality of arc-shaped I-shaped steels 5 arranged at intervals along the direction of the tunnel, and the I-shaped steels 5 The groove of the groove faces the direction of the tunnel, and a strip-shaped anchor plate 3 is arranged between the adjacent I-beams 5. The anchor plate 3 is fastened to the arc-shaped inner surface of the I-beam 5, and the inner surface is provided with an anchor. 4. A prestressed anchor cable 1 is connected to the anchorage 4, and the prestressed anchor cable 1 extends radially outward toward the I-beam 5 into the side wall of the tunnel.

[0024] Preferably, the two ends of the above-mentioned anchor backing plate 3 are fixedly connected on the I-beam 5 by welding, and the set anchor backing plate 3 can form the steel arch 2 as a whole a...

Embodiment 2

[0027] Embodiment 2: A construction method for the construction support structure of a large-section weak surrounding rock tunnel. The method is to use the existing pilot pit and formed steel arch initial support of the tunnel, and set temporary vertical supports and temporary elevations. Prestressed anchor cables are applied to the positions of the arch cross braces, and the original temporary vertical braces and cross braces are replaced by anchor cables, and the prestress is adjusted according to the tunnel load to meet the requirements of cable replacement braces. The specific implementation steps are as follows:

[0028] Step 1. Drill holes and install prestressed anchor cables at the middle position of the two steel arches of the initial support that have been formed. The anchor cables are provided with anchor sections and free sections. 6, 2 on the vault, staggered up and down by 1.5~2m, 2 on the left and right arches, staggered up and down by 1.5~2m; vertically set acco...

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Abstract

The invention discloses a supporting structure for large-section weak surrounding rock tunnel construction and a construction method thereof. The supporting structure comprises a steel arch which is formed by arranging a plurality of arc-shaped I steel at intervals in the tunnel direction. Grooves of the I steel are in the tunnel direction, strip-type anchor bearing plates are arranged between the adjacent I steel and firmly attached to the inner side surfaces of the arc shapes of the I steel, and anchorages are arranged on the inner side surfaces of the anchor bearing plates and connected with pre-stressed anchor cables. According to the supporting structure for large-section weak surrounding rock tunnel construction and the construction method thereof, prestress of the pre-stressed anchor cables is transmitted to the steel arch through the strand tapered anchorages and the anchor bearing plates, so that the pre-stressed anchor cables and the steel arch serve as a part of a tunnel early support together, a cable-arch combined supporting system is formed, mounting of subsequent temporary supports is reduced, the technological requirement for dismantling of the temporary supports is lowered, the support dismantling efficiency is improved, the construction safety is guaranteed, the problems that many partitions are needed, the construction space is small, many procedure links exist, and the construction organization difficulty is high during large-section weak surrounding rock tunnel construction are effectively solved, and the construction efficiency is greatly improved.

Description

technical field [0001] The invention relates to a cable-arch combined support structure used in the construction of large-section soft surrounding rock tunnels and a construction method thereof, and belongs to the tunnel technical field of primary support systems of large-section weak surrounding rock tunnels. Background technique [0002] In the construction of large-section tunnels with weak surrounding rock, the double-side-wall pilot pit method and CRD method are often used to divide the large section into several small blocks through the internal supporting steel frame, so as to achieve span reduction and achieve the purpose of stabilizing the surrounding rock. This type of method has the characteristics of cumbersome process, high process requirements, inability to use large-scale mechanical operations, slow construction speed, high construction cost, and high risk of dismantling. Contents of the invention [0003] The technical problem to be solved by the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/18E21D20/00E21D21/00
CPCE21D11/18E21D20/003E21D21/0026
Inventor 申剑陈德斌夏真荣肖承倚吴秀雄蒋志权张健朱东平钟勇刘云周崇连解振乙张伯湘陈明颜桢伟
Owner THE FIFTH ENGEERING OF CHINA RAILWAY 5TH BUREAU GROUP
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