A construction method at the intersection of the cross tunnel for vehicles and the main tunnel of the tunnel in the fractured surrounding rock
A construction method and intersection technology, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of poor self-stabilization ability of fragmented surrounding rocks, prone to landslides, etc., and achieve good supporting effect, achieve stable support, The effect of reducing the risk of vault collapse
Active Publication Date: 2019-03-08
中铁二十局集团第二工程有限公司
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Problems solved by technology
The self-stabilization ability of the fragmented surrounding rock is extremely poor, and landslides are prone to occur during the construction process
Method used
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[0049] Such as figure 1 , figure 2 with image 3 Shown is a construction method at the intersection of the cross tunnel for vehicles in the fractured surrounding rock and the main tunnel of the tunnel. Intersect with the design axis of the tunnel main tunnel, the tunnel tunnel section at the intersection of the front end opening of the vehicle transverse tunnel 1 and the tunnel main tunnel is the tunnel main tunnel intersection section 2; the designed cross section of the vehicle transverse tunnel 1 is a rectangular cross section ; Concrete construction includes the following steps:
[0050] Step 1. Construction of the upper part of the transverse tunnel for vehicles:
[0051] Step 101, Excavating the upper part of the vehicle transverse tunnel 1 from back to front along the longitudinal direction of the vehicle transverse tunnel 1;
[0052] Step 102: Initially support the upper body of the horizontal tunnel 1 formed by excavation; and support a plurality of horizontal do...
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The invention discloses a construction method for the cross position of a vehicle-traveling transverse cave and a tunnel main cave in broken surrounding rock. The designed position of the vehicle-traveling transverse cave is located on one side of the designed position of the tunnel main cave, the designed axis of the vehicle-traveling transverse cave and the designed axis of the tunnel main cavecross, and the designed cross section of the vehicle-traveling transverse cave is rectangular. In specific construction, the construction method comprises the following steps that firstly, an upper cave body of the vehicle-traveling transverse cave is constructed; secondly, an advanced large pipe shed is constructed; thirdly, an upper cave body at the tunnel main cave crossing section is constructed; fourthly, arch frames of the upper cave body at the tunnel main cave crossing section is constructed; fifthly, vertical columns of main cave gantries are detached; sixthly, a lower cave body of the vehicle-traveling transverse cave is constructed; seventhly, a lower cave body at the tunnel main cave crossing section is constructed; eighthly, a secondary lining of the tunnel main cave crossingsection is constructed; and ninthly, a secondary lining of the vehicle-traveling transverse cave is constructed. Construction is safe and reliable, and the construction requirements of the cross position of the vehicle-traveling transverse cave and the tunnel main cave in the broken surrounding rock can be met.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method at the intersection of a vehicle transverse tunnel and a tunnel main tunnel in fractured surrounding rock. Background technique [0002] In tunnel construction, it is often encountered in the case of construction in the fractured surrounding rock, the lithology of the surrounding rock is cataclast rock, which is one of dynamic metamorphic rocks. The original rock was broken by strong stress. It has a cracked structure or broken plaque structure. It can be formed by various rocks, but it is mainly developed in rigid rocks. Such as tile rock, sandstone, etc. Mostly block structure or band structure. The self-stabilization ability of the fragmented surrounding rock is extremely poor, and landslides are prone to occur during the construction process. Due to the weak geological conditions, collapse accidents are extremely prone to occ...
Claims
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IPC IPC(8): E21D9/14E21D9/00E21D11/00E21D11/18E21D20/00
CPCE21D9/001E21D9/14E21D11/00E21D11/18E21D20/00
Inventor 王群英冯振宁时飞
Owner 中铁二十局集团第二工程有限公司