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Tunnel support structure

A technology for supporting structures and tunnels, applied in the fields of railway tunnels and highways, can solve the problems of increased investment in ventilation equipment, energy consumption and operating costs, increased ventilation resistance of tunnels, and affected ventilation effects. The effect of maintainability and easy operation

Inactive Publication Date: 2006-11-08
SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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Problems solved by technology

However, this lining structure also has the following disadvantages: 1. The high-performance shotcrete material is expensive, and its price is about 1.5 times that of ordinary shotcrete, and 4 to 5 times that of general molded concrete; 2. High-performance shotcrete follows the mold Compared with concrete, the flatness is poor, which increases the ventilation resistance of the tunnel and affects the ventilation effect
Therefore, this support structure has a greater impact on the ventilation effect, especially for super-long tunnels with high ventilation requirements, which will inevitably increase the investment, energy consumption and operating costs of ventilation equipment

Method used

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] figure 1 It is a structural schematic diagram of the composite support structure adopted in the existing highway tunnel. refer to figure 1 , the existing tunnel lining support structure is composed of primary support sprayed concrete layer 10, waterproof layer 15, secondary lining molded concrete layer 20, and fireproof layer 25. The primary support shotcrete layer 10 is formed by concrete sprayed on the surrounding rock of the tunnel. In this composite support structure, the primary support shotcrete layer 10 and the secondary lining molded concrete layer 20 do not form a tight bond, and interlayer displacement is likely to occur after the force is applied, and the overall bearing capacity is poor. Tunnel leakage and lining cracking are prone to occur after completion and operation. The waterproof layer 15 is laid on the inner wall of the in...

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Abstract

The present invention discloses a kind of tunnel support structure, and aims at providing tunnel support structure with raised integral bearing capacity, simple construction and excellent maintainability. The tunnel support structure includes a sprayed concrete layer combined to tunnel wall rock as the initial support; and a secondary laid and molded concrete layer combined with the inner wall of the sprayed concrete layer as the initial support. The present invention has the advantages of raised integral bearing capacity, simple construction, low cost, excellent maintainability, simple operation and capacity of ensuring the integral durability of the tunnel structure.

Description

technical field [0001] The invention relates to road and railway tunnels, in particular to tunnel support structures. Background technique [0002] After the excavation of highway and railway tunnels, the surrounding rock needs to be supported by support structures. At present, the support structures commonly used in tunnel design and construction mainly include the following two forms: [0003] 1. For highway and railway tunnels designed and constructed using the New Austrian Method (NATM), the composite support structure is composed of the primary support shotcrete layer, waterproof layer, and secondary lining molded concrete layer from the outside to the inside. Tunnels sometimes need to set a fireproof layer inside the secondary lining molded concrete layer, while railway tunnels usually do not have a fireproof layer. This composite support structure has been widely used in railway and road tunnels in recent decades. Some road and railway tunnels designed and construct...

Claims

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Application Information

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IPC IPC(8): E21D11/04
Inventor 郑金龙李玉文邓刚李海清王联林国进田尚志钟勇
Owner SICHUAN DEPT OF TRANSPORTATION HIGHWAY PLANNING PROSPECTING & DESIGN RES INST
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