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Tunnel entrance protection structure for V-shaped terrain and construction method of tunnel entrance protection structure

A technology of protective structure and construction method, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as increased construction costs, cracking and instability of slopes, and potential safety hazards.

Pending Publication Date: 2020-10-20
YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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Problems solved by technology

In view of the special situation that the tunnel entrance is in the "V" shape, in the conventional construction method, it is generally adopted to open the hole, make the dark hole open, shorten the dark hole, increase the open hole and backfill the hole. The method not only destroys the original landform, destroys the ecological environment, and increases the construction cost, but also tends to cause side slope cracking and instability during the excavation process, causing landslides, collapses and other accidents, and there are serious safety hazards

Method used

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  • Tunnel entrance protection structure for V-shaped terrain and construction method of tunnel entrance protection structure
  • Tunnel entrance protection structure for V-shaped terrain and construction method of tunnel entrance protection structure
  • Tunnel entrance protection structure for V-shaped terrain and construction method of tunnel entrance protection structure

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Embodiment Construction

[0079] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict Next, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0080] As shown in the accompanying drawings of the description, a tunnel entry protection structure for V-shaped terrain, it includes a plurality of arched steel arches (1) arranged side by side on the outside of the tunnel opening in sequence from the inside to the outside, and from the outside to the outside. A plurality of special-shaped steel arches (2) are arranged side by side on the inner side of...

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Abstract

The invention discloses a tunnel entrance protection structure for V-shaped terrain and a construction method of the tunnel entrance protection structure. The method comprises the following steps of S1, construction preparation; S2, tunnel top intercepting ditch excavation; S3, side and upward slope excavation and supporting; S4, sleeve arch and pipe shed construction; S5, special-shaped section sleeve arch construction; S6, advanced large pipe shed construction; and S7, dark tunnel construction. According to the V-shaped terrain underground cave entering construction method, special-shaped sleeve arch supporting is adopted, so that a tunnel enters underground excavation construction in advance, excavation and protection of a high-side upward slope of a cave entrance are reduced, potentialsafety hazards and environmental damage of the cave entrance are reduced, time and labor are saved, the special-shaped sleeve arch is constructed by spraying concrete, a certain support formwork is saved, and the modulus is reduced; moreover, the solidification time of the sprayed concrete is short, so that the structure enters a stressed state in advance, the construction time is saved to a great extent, the environmental damage and unnecessary excavation construction before entering a hole can be reduced, the construction cost is reduced, and meanwhile, the safe and rapid construction in the hole can be achieved.

Description

technical field [0001] The present invention relates to a tunnel entry protection structure and its construction method, in particular to a tunnel entry protection structure for V-shaped terrain and its construction method, which is mainly suitable for roads and railways under "V"-shaped terrain The invention relates to tunnel construction, etc., belonging to the technical field of tunnel construction. Background technique [0002] Generally speaking, the tunnel entrance project is the key. Whether the construction of each part of the tunnel construction works smoothly lays the foundation for safe entry into the tunnel. In view of the special situation that the tunnel entrance is in the "V" shape, in the conventional construction method, it is generally adopted to open the hole, make the dark hole open, shorten the dark hole, increase the open hole and backfill the hole. This method not only destroys the original landform, destroys the ecological environment, and increases ...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18E21D11/28
CPCE21D11/102E21D11/105E21D11/183E21D11/28
Inventor 杨中才杨龙林林郝少峰徐川余毅彬周永荣杨红德陈文勇吴海波袁照雄王根宝刘国盟张勇陈胜委刘国涛张蕾谭敬文陈继红方国良朱红喜田志明方碑林尹世雄
Owner YUNNAN CONSTR INVESTMENT HLDG GRP CO LTD
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