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Construction method for integral straight middle wall type double-arch tunnel

A construction method, the technology of straight middle wall, which is applied in tunnel, tunnel lining, earthwork drilling and mining, etc., can solve the problem of water leakage at the top of middle wall, poor stress at the connection point of straight middle wall, and increased land occupation of adjacent structures outside the tunnel, etc. problems, to achieve the effect of improving the force of the middle wall, avoiding water leakage, and reducing the infiltration of surface leakage and water infiltration

Active Publication Date: 2015-04-15
北京国道通公路设计研究院股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional multi-arch tunnel adopts an overall straight middle wall structure. Due to technological problems, there has always been a problem of water leakage at the top of the middle wall, which has caused many problems for operation and maintenance.
[0004] The Chinese patent "An Improved Composite Partition Wall Multi-Arch Tunnel Structure" (Application No.: 201020122453.9, Publication No.: CN201696056U) proposes: "In order to solve the problem of easy cracking at the initial support of conventional multi-arch tunnel structures and the fixing of the middle partition wall To solve the problem, the primary support and secondary lining of the conventional composite partition wall are separately arranged in a ring, and the joints between the primary support and the secondary lining and the intermediate partition wall are removed
"The specific structural form is that the straight middle wall is a flat roof structure, and the connection points between the initial support of the left and right main holes and the straight middle wall of this structure are not well stressed.
And the middle structure of this patent has as many as 3 layers, and its thickness is thicker than the single-layer straight middle wall structure of the patent of the present invention, with more construction procedures and longer construction period
Due to the thick middle structure of this patent, the excavation span of the entire multi-arch tunnel increases, the cost increases, and the area occupied by adjacent structures outside the tunnel increases

Method used

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  • Construction method for integral straight middle wall type double-arch tunnel
  • Construction method for integral straight middle wall type double-arch tunnel
  • Construction method for integral straight middle wall type double-arch tunnel

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Embodiment Construction

[0069] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0070] Such as Figures 1 to 18 As shown, a construction method for an overall straight mid-wall type double-arch tunnel comprises the following steps:

[0071] Ⅰ. Excavate the intermediate pilot tunnel according to the design requirements, and carry out the initial support of the intermediate pilot tunnel;

[0072] Step 1: Excavate the upper steps of the pilot tunnel according to the design requirements 1, carry out the initial support of the pilot tunnel 600;

[0073] Step 2: Excavate the lower steps of the pilot tunnel according to the design requirements 2. Perform the initial support of the pilot tunnel 600;

[0074] Ⅱ. The middle wall of the double-arch tunnel is constructed in the middle pilot tunnel, and there is a hollow on the top of the middle wall between the top of the middle wall and the top wall of the middle pilot tunnel;...

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Abstract

The invention discloses a construction method for an integral straight middle wall type double-arch tunnel. The construction method comprises the following steps that a middle pilot tunnel is excavated according to design requirements, preliminary bracing of the middle pilot tunnel is carried out, the middle wall of a double-arch tunnel is constructed in the middle pilot tunnel, the top of the middle wall is of a Y-shaped structure, a middle wall top cavity is reserved between the top of the middle wall and the top wall of the middle pilot tunnel, a drainage system is arranged on the middle wall, backfill is carried out on the middle wall top cavity, a left hole and a right hole of the double-arch tunnel are excavated according to the design requirements, and pavement construction and tunnel mechanical and electrical installation engineering construction are respectively carried out on the left hole and the right hole after construction. Compared with an identical three-layer combined type straight middle wall structure, a three-layer combined type curved middle wall structure and a five-layer combined type curved middle wall structure, the construction method can effectively reduce the thickness of the middle wall, a structure is simple, construction is convenient, construction cost is reduced, the occupied area of a tunnel outer lead is reduced, and land resources are saved.

Description

technical field [0001] The invention relates to a tunnel construction technology, in particular to a construction method for an integral straight middle wall type double-arch tunnel. Background technique [0002] With the development of road construction, more and more roads gradually go into mountainous areas. The construction of highway tunnels has played an important role in reducing the incidence of traffic accidents, shortening the operating mileage, improving driving speed and comfort, effectively preventing various geological disasters caused by high filling and deep excavation of roadbeds, protecting the ecological environment, saving land, and promoting economic development. positive effect. Compared with separate tunnels, multi-arch tunnels have the advantages of smoother alignment and less land occupation, and more and more multi-arch tunnels are used in the construction of medium and short tunnels. However, the traditional multi-arch tunnel adopts an overall st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/14E21D11/00E21D11/38E21D11/10E21F16/02
Inventor 齐琳李涛齐晔
Owner 北京国道通公路设计研究院股份有限公司
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