Anti-Cracking Construction Technology of Reinforced Concrete Tunnel
Due to the high limited expansion rate,low strength and serious crack phenomenon of the existing an-ti-crack construction technology,the research on anti-crack construction technology of reinforced concrete in tun-nel is carried out.Before the tunnel excavation,the steel frame support of the compound arch was built and the gaps were filled with shotcrete.The initial surrounding rock is consolidated to form a circumferential protective shell.After the excavation of the tunnel,the hole is reversed filled to prevent the deformation and damage of the collapsed part,and the construction surface is repaired by shotcrete.The core soil is reserved for excavation by one annular cut,and the filling material is filled into the crack to improve the bearing capacity of the concrete lining.In the construction process,the crack surface is levelled with waterproof mortar and maintained regularly.After the tunnel is completed,the safety analysis and grade judgment of the fracture lining section are carried out.The test results show that the concrete strength is 45 MPa and the limited expansion rate is 0.045%during 28 days of tunnel construction,which is in line with the expected construction effect and the crack phenomenon is well alleviated.
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