A New Type of Tunnel Primary Support Structure and Construction Method
A primary support and tunnel technology, applied in tunnels, tunnel linings, temporary shields, etc., can solve problems such as damage to workers' cardiopulmonary function, restrict development and progress, and messy tunnel drainage, so as to improve the construction environment and be implemented Good performance and convenient construction work
Active Publication Date: 2021-07-16
ZHEJIANG ZHENGFANG TRAFFIC CONSTR CO LTD
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Problems solved by technology
[0002] At present, the traditional primary support structure of tunnels is a combined force-bearing structure composed of anchor rods, steel mesh, steel frames and shotcrete. Although this type of primary support structure is widely used, it also has certain problems, such as The huge dust pollution inside the tunnel caused by rod drilling and shotcrete seriously damaged the cardiopulmonary function of workers, the excessive deformation caused by the release of initial stress around the tunnel, and the messy and irregular drainage inside the tunnel. To a certain extent, it also restricts the technical development and progress of the primary support structure of tunnels in my country. Therefore, the traditional primary support structure needs innovation and transformation to meet the construction needs of socialist modernization in the new era.
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[0039] The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
[0040] according to figure 1 As shown, at the intersection position of the tunnel contour line 19 and the pilot tunnel contour line 20, the bilateral symmetrical excavation of the bullet-shaped pilot tunnel 18 is carried out, and an umbrella-shaped support frame 17 is set every time the excavation reaches a certain depth. Support frame 17 adopts main bar 21, secondary bar 22 and gear rod 23 to make, adopts connecting rod 24 and protective net 25 to connect betwee...
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The invention relates to a novel tunnel primary support structure, which includes a support foundation, connecting steel columns, steel arches, steel plates, micro-expansion fine stone concrete and fast-setting fine stone concrete; the support foundation is a cast-in-place reinforced concrete structure, The connecting steel column is located on the support foundation, and the side adjacent to the tunnel outline is provided with transverse anchor bars and anchored in the stratum outside the tunnel. The groove is used to place the water collection pipe; the steel arch frame and the connecting steel column are connected by bolts or welding; Connection by welding. The beneficial effects of the present invention are: compared with the traditional primary support structure, the structure of the present invention is relatively simple, and the implementability is better, and the use of micro-expansion fine stone concrete to fill the excavation surface of the tunnel plays a certain role of back pressure, which can ensure Stability of tunnel excavation faces.
Description
technical field [0001] The invention relates to a tunnel initial support structure and a construction method, in particular to a novel tunnel initial support structure and a construction method. Background technique [0002] At present, the traditional primary support structure of tunnels is a combined force-bearing structure composed of anchor rods, steel mesh, steel frames and shotcrete. Although this type of primary support structure is widely used, it also has certain problems, such as The huge dust pollution inside the tunnel caused by rod drilling and shotcrete seriously damaged the cardiopulmonary function of workers, the excessive deformation caused by the release of initial stress around the tunnel, and the messy and irregular drainage inside the tunnel. To a certain extent, it also restricts the technical development and progress of the primary support structure of tunnels in my country. Therefore, the traditional primary support structure needs innovation and transf...
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IPC IPC(8): E21D11/00E21D11/10E21D11/18E21D11/15E21D19/00E21D20/00E21F16/02E21D9/00
CPCE21D9/00E21D11/00E21D11/10E21D11/105E21D11/155E21D11/18E21D11/183E21D19/00E21D20/00E21F16/02
Inventor金泉方碧威柏晶李晓丰卢崇杰朱伟涛程文俊
OwnerZHEJIANG ZHENGFANG TRAFFIC CONSTR CO LTD