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Tunnel lining steel belt reinforcing structure and construction method

A technology for strengthening structures and construction methods, applied in tunnel linings, tunnels, shaft linings, etc., can solve the problems of inconvenient construction, unreliable reinforcement, and high cost, and achieve the effects of fast construction, reliable tunnel lining structure, and low cost.

Active Publication Date: 2020-01-14
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a tunnel lining steel strip reinforcement structure and construction method to solve the problem of insufficient reinforcement and inconvenient construction faced by the existing steel strip reinforcement method when the tunnel lining is slightly less thick and slightly or moderately cracked. and costly technical issues

Method used

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  • Tunnel lining steel belt reinforcing structure and construction method
  • Tunnel lining steel belt reinforcing structure and construction method
  • Tunnel lining steel belt reinforcing structure and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: A kind of tunnel lining steel strip reinforcement structure, see figure 1 , including steel belt 2 and lock foot anchor 3, the lining includes primary support structure 1, vault 11, side walls 12 on both sides, waterproof and drainage structure 13 and secondary lining structure 14, steel belt 2 includes hoop steel belt 4 and longitudinal Steel belt 5.

[0038] The hoop steel belt 4 is spliced ​​by a plurality of 25cm wide and 5mm thick Q235B-type segmented steel belts. The joints at the segments are welded with flat openings, and then lapped with 70cm long joint steel plates. The joint steel plates and The original reinforced steel plates are fixed with M16×160 bonding mold bottom expansion anchor bolts, and bonded with steel glue.

[0039] The hoop steel belt 4 adapts to the cross-sectional shape of the lining and extends from one side wall to the other side wall. A plurality of hoop steel belts 4 are arranged intermittently along the tunnel longitudinal...

Embodiment 2

[0042] Embodiment 2: A construction method of the tunnel lining steel strip reinforcement structure of Embodiment 1, comprising the following steps:

[0043] (1) Measurement positioning

[0044] Carry out measurement and setting-out positioning. In order to ensure that the steel strips are installed on one line, the positioning should be carried out according to the construction joints of the lining or formwork joints when marking the line, and the position of each steel strip should be marked with an ink line.

[0045] (2) Base surface treatment, concrete surface cleaning

[0046] Remove the fireproof coating and corroded concrete on the surface of the concrete where the steel belt is attached, and grind the surface dust to 2-3mm, so that the lining concrete is completely exposed to the fresh surface, and blow off the dust with compressed air, clean the concrete surface and keep it dry. The base surface should be smooth and smooth, with the flatness not greater than 1.5mm / m,...

Embodiment 3

[0059] Example 3: During the installation and reinforcement of the steel belt 2 in Example 2, it is necessary to measure the surrounding rock and support (the original structural surface), and the required items include: observation of structural disease, peripheral displacement, vault sink. The observation of structural damage should start from the following two aspects: the observation of the increase of cracks; the observation of the development of cracks and staggered platforms and the development of groundwater. During the observation process, the width, length, date and other on-site markings should be done well.

[0060] The measurement method and layout shall be carried out in accordance with the "Technical Specifications for Construction of Highway Tunnels" (JTGF60-2009). The measurement method adopts the free station non-contact method of the total station. The vault sinking measurement point is buried at the center line of the vault tunnel, and two sets of peripher...

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Abstract

The invention discloses a tunnel lining steel belt reinforcing structure and a construction method. The technical problems that an existing steel belt reinforcing method is not reliable enough, and construction is not convenient are solved. The reinforcing structure comprises annular steel belts, longitudinal steel belts and feet-lock bolts, the annular steel belts are intermittently arranged in the longitudinal direction of a tunnel and separately fixed to the outer wall of a lining, the longitudinal steel belts are distributed intermittently in the annular direction of the tunnel and fixed to the adjacent annular steel belts, the longitudinal steel belts at the two sides of the same annular steel belt are distributed alternately, and the feet-lock bolts are arranged on the feet of wallsat the two sides of the annular steel belts and anchored to the lining. The construction method comprises the following steps of performing surveying, setting-out and positioning; cleaning the surfaceof the lining; installing the annular steel belts and the longitudinal steel belts; arranging the feet-lock bolts at the feet of the walls at the two sides of the annular steel belts and anchored tothe annular steel belts and the lining. The longitudinal steel belts and the annular steel belts are distributed alternately, the tunnel lining structure is firmer, feet-lock bolts are only arranged at the corners at the two sides of the annular steel belts, and construction is easier.

Description

technical field [0001] The invention relates to the technical field of tunnel lining reinforcement, in particular to a tunnel lining steel belt reinforcement structure and a construction method. Background technique [0002] After a period of operation, road tunnels generally need to be repaired every 7 to 10 years due to the weathering of the surrounding rock and the aging of facilities in the tunnel. Tunnel reinforcement can prolong the service life of the tunnel, and with a small amount of capital investment, the tunnel can meet the needs of traffic again. [0003] Lining cracks are the most common type of tunnel damage, mainly including tunnel lining cracks, misalignment and deterioration of lining materials. More than 90% of the tunnels have varying degrees of lining cracks. The bearing capacity of the structure is greatly reduced after the lining structure is damaged, which poses a safety hazard to the tunnel operation safety. [0004] Commonly used reinforcement mea...

Claims

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Application Information

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IPC IPC(8): E21D11/18E21D11/15E21D11/24E21D11/38E21D20/00
CPCE21D11/155E21D11/18E21D11/24E21D11/38E21D20/00
Inventor 李学刚陈礼博郭海坡陈晓飞李红胜闫世巍刘明辉张志明岑道勇
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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