Construction method and structure of tunnel entering

A construction method and hole-entry technology, applied in tunnels, tunnel linings, infrastructure engineering, etc., can solve the problems of large ecological environment damage, large site occupation, and large amount of temporary slope protection works, so as to reduce backfilling and occupation It is beneficial to the effect of slope stability

CN109869163APending Publication Date: 2019-06-11BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-06-11

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Abstract

The invention discloses a construction structure and method of tunnel entering. A support is composed of filling piles, crown beams and grating steel frame net spraying concrete; an advanced pipe shedor a small guide pipe grouting or an anchor rod is constructed along an excavation line to be treated as an advanced support of underground excavation, and thus effective auxiliary measures are provided for underground excavation; and entering construction is conducted in a step-by-step mode. Earth-rock excavation and the protection workload are reduced, backfilling is reduced, land occupation isreduced, damage on ecological environments is reduced, side slope stability is facilitated, conservation of water and soil and environmental protection are facilitated, the built landscape effect isgood, and construction organization is simple and convenient.
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Description

technical field

[0001] The invention relates to a tunnel entry structure and a construction method. Background technique

[0002] Hole entry is the key and difficult point in tunnel design and construction. Generally, slope excavation is adopted, and an advanced pipe shed is used to dig into the hole at a certain depth, and then the long open hole is connected, and the side slope is backfilled and greened. This construction method requires a large amount of earthwork excavation and temporary slope protection works, occupies a large area, and causes more damage to the terrain and landform, which is not conducive to the stability of the slope, is not conducive to the maintenance of water and soil conservation and the maintenance of the ecological environment, and is often expensive. high.

[0003] After patent retrieval, it was found that Li Zhiwei, Guiyang Survey and Design Research Institute Co., Ltd. of China Electric Power Construction Group Co., Ltd. has a utility model...

Examples

Embodiment Construction

[0021] The specific construction method described in the present invention is further described as follows in conjunction with the accompanying drawings and embodiments.

[0022] The invention proposes the tunnel entry structure and construction method: the tunnel entry support structure is composed of cast-in-situ piles, crown beams, grid steel frame and sprayed concrete; advanced pipe shed or small conduit grouting or anchors are applied along the excavation line The rod is used as the advance support of the underground excavation, providing effective auxiliary measures for the underground excavation; the construction is carried out in steps.

[0023] Such as Figure 1-Figure 6 As shown, the present invention proposes the construction steps of the tunnel entry structure: first, manual digging or drilling of concrete piles 1; construction of crown beams 2; layered excavation support grid steel frame mesh shotcrete 3 from top to bottom; Apply advanced pipe shed or small pipe ...