Method for supporting surrounding rock of diversion tunnel
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A technology for surrounding rock support and water diversion tunnels, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of limited construction space, long construction period, and long lining period for small-section and extra-long water diversion tunnels, and save personnel management. cost, less cost input, and the effect of speeding up the lining time
Pending Publication Date: 2021-07-30
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP NO 4 ENG
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[0004] The purpose of the patent of the present invention: the purpose of the present invention is to solve the problems of limited construction space, long lining period and long construction period of the original design of the small-section super-long water diversion tunnel. The present invention proposes a method for supporting the surrounding rock of the water diversion tunnel
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specific Embodiment approach 1
[0048] Specific implementation mode one: a method for supporting the surrounding rock of a water diversion tunnel. This method is applicable to the B2 type support of the IV type surrounding rock and the C1 type support of the V type surrounding rock, and specifically includes the following steps:
[0049] Step 1: Arrange support;
[0050] Use profiled steel pavement 1 as support within the range of the top arch and side walls;
[0051] Step 2: Arrange the anchor rod;
[0052] Lay anchor rods within the scope of the top arch and side walls, and arrange the anchor rods in a row every other support, and arrange three anchor rods in each row.
[0054] Lay connecting bars within the range of the top arch and side walls to connect the connecting bars to the supports;
[0055] Step 4: laying steel mesh;
[0056] Lay reinforcement mesh within the scope of the top arch and side walls;
[0057] Step 5: Spray concrete 2;
[0058]...
specific Embodiment approach 2
[0061] Embodiment 2: The anchor rods are all arranged on the support body.
[0062] Other implementation manners are the same as the specific implementation manner 1.
specific Embodiment approach 3
[0063] Specific implementation method three: the medium-shaped steel 1 in the step 1 is made of No. 14 I-beam, and the distance between each support is 1.2m; the anchor rod in the step 2 is an M20 mortar C20 anchor rod, and the length of the anchor rod is 1.5 m, and the row spacing of two adjacent rows of anchor rods is 2.4m, the longitudinal connecting bars in the step 3 adopt C16 steel bars, the circumferential spacing of the longitudinal connecting bars is 1.0m, and the reinforcing mesh in the step 4 is A6 steel mesh , the inter-row spacing of steel mesh is 200mm * 200mm; Concrete 2 is C20 concrete in described step five, and concrete 2 spraying thickness is 160mm; Plain concrete 3 is C30 plain concrete in described step six, and the spraying thickness of plain concrete 3 is 300mm.
[0064] Other implementation manners are the same as the specific implementation manner 1.
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Abstract
The invention belongs to the field of surrounding rock supporting construction methods, and particularly relates to a method for supporting surrounding rock of a diversion tunnel. The method for supporting the surrounding rock of the diversion tunnel aims to solve the problems that a small-section extra-long diversion tunnel is limited in construction space, and an originally-designed lining construction method is long in period and long in construction period. The method for supporting the surrounding rock of the diversion tunnel comprises the steps that S1, supports are arranged, specifically, profile steel is laid within the range of a top arch and side walls to serve as the supports; S2, anchor rods are arranged, specifically, the anchor rods are laid within the range of the top arch and the side walls, the anchor rods are arranged once every other truss in a supporting mode, and three anchor rods are arranged in each row; S3, longitudinal connecting ribs are laid, specifically, the connecting ribs are laid within the range of the top arch and the side walls, so that the connecting ribs are connected with the supports; S4, a reinforcing mesh is laid, specifically, the reinforcing mesh is laid within the range of the top arch and the side walls; S5, concrete is sprayed, specifically, the concrete is sprayed within the range of the top arch and the side walls; and S6, secondary lining is conducted, specifically, plain concrete is poured within the range of the side walls. Tunnel lining is changed into a channel form, and original trolley lining is changed into formwork lining, so that the construction period is shortened, and benefits are increased.
Description
technical field [0001] The invention belongs to the field of surrounding rock support construction methods, and in particular relates to a method for surrounding rock support of water diversion tunnels, more specifically, a method suitable for surrounding rock support construction of small-section extra-long water diversion tunnels under complex geological conditions method. Background technique [0002] With the intensification of my country's infrastructure construction, there are more and more construction projects such as large-scale hydropower station projects, water diversion projects, and sewage projects, while the construction of small and medium-sized long tunnels is more common. The characteristics of small and medium-sized long tunnels are "small" and "long". Small ones are limited by the size of the section, construction in a limited space, many processes overlap, and mutual interference is large. During the tunnel lining process, large-scale construction machi...
Claims
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Application Information
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