Space joint support structure and support method for water-rich broken strata tunnel
A combined support and tunnel technology, applied in the direction of tunnel, tunnel lining, drainage, etc., can solve the problems of endangering the stability of the tunnel structure and the safety of the operators, the difficulty of effective prevention and control of water leakage, and the poor self-stabilization ability of the surrounding rock, etc., to achieve High rigidity and bearing capacity, stable support performance, and the effect of preventing the deterioration of surrounding rock
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[0043] Example 1: A spatial joint supporting structure of a tunnel in a water-rich fractured stratum, such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 with Image 6 As shown, it includes an initial concrete layer with a thickness of 3-5 cm sprayed on the surface of the surrounding rock in the tunnel 1, a steel mesh 2 laid on the surface of the initial concrete layer 1, and a plurality of steel arches 3 arranged at intervals. 3 is in contact with the surface of the steel mesh 2. A longitudinal connecting steel beam 4 is circumferentially installed between the steel arch 3 and the steel arch 3, and the longitudinal connecting steel beam 4 is staggered along the axis of the tunnel. The longitudinal connecting steel beam 4 is connected with an anchor rod 5 whose anchoring section is located inside the tunnel surrounding rock. The surface of the steel mesh 2 is sprayed with a steel fiber concrete layer 6 covering the steel arch 3, the steel mesh 2 and the longitudinal...
Example Embodiment
[0057] Embodiment 2: A supporting method of a spatial joint supporting structure of a tunnel in a water-rich fractured stratum, such as Figure 7 As shown, including the following steps:
[0058] 1) Do the primary flexible support, that is, spray concrete with a thickness of 3-5cm to close the surrounding rock on the inner wall of the tunnel.
[0059] 2) Lay the steel mesh 2 and erect the steel arch 3, lay the steel mesh 2 with a mesh size of 25cm on the concrete surface in step 1), and then erect the steel mesh 2 in contact with the surface of the steel mesh at a distance of 50-70cm. A steel arch 3.
[0060] 3) Construct a two-story rigid support structure. Between every two grades of steel arches 3, longitudinally connected steel beams 4 staggered along the tunnel axis are arranged in the circumferential direction according to the designed spacing, and then the longitudinally connected steel beams 4 and The overlapping parts of the steel supporting parts of the steel arch 3 are in...
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