Large-diameter long pipe curtain construction method for shallowly-buried large-span under-tunnel-passing architectural structure

Abstract

The invention provides a large-diameter long pipe curtain construction method for a shallowly-buried large-span tunnel under-tunnel-passing architectural structure. The large-diameter long pipe curtain construction method comprises the following steps: (1) constructing manual hole digging supporting piles for supporting a pipe curtain and hole digging hoarding piles at the both sides; (2) pouring a pile cap beam, and forming an n-shaped supporting structure supported by the plurality of piles at the both sides of a hole; (3) pouring and jacking a steel pipe back wall, paving a steel pipe sliding way, hanging the steel pipes and forming the pipe curtain by ejecting; (4) excavating a soil body in the longitudinal length direction in a part and block manner; (5) constructing a first section rigid framework digging pile foundation of a main body, a bearing table and a rigid framework of the main body under the protection of the pipe curtain at the top and the lateral face and a temporary support, preserving anchoring lengths on vertical steel bars of the bearing table and a main body structure; pouring between the main body structure and a steel pipe; (6) repeating steps (4) and (5) until the last section of the soil body is excavated and the corresponding main body structure is poured; and (7) dismounting the n-shaped supporting structure above the bottom face of the bearing table, constructing the residual n-shaped rigid framework at the both ends, and pouring a separated type bottom board, so as to form an integral structure. With the adoption of the construction method, the normal using functions of important architectural structures at the upper part are not influenced during construction; the sedimentation of the ground and the architectural structures above the ground can be effectively controlled.

Description

technical field [0001] The invention relates to a large-diameter long pipe curtain construction method suitable for shallow-buried long-span tunnels passing through important structures, etc., and provides a structure type that can effectively reduce the impact of high-speed train vibration on important structures above, belonging to railways and Road tunnel construction field. Background technique [0002] In the construction of general railway or highway tunnels, large pipe sheds are often set up due to the low level of surrounding rock at the entrance of the tunnel (rock mass is broken or the tunnel body is located in the soil layer). The purpose of its application is mainly to prevent the surrounding rock from collapsing during the excavation stage. , Control the stratum displacement caused by construction. With the rapid development of railway and highway construction, the surrounding environment through which the line passes has become more and more complex, and the i...

AI Technical Summary

Problems solved by technology

When the passing structure (structure) is very sensitive to settlement, the traditional small-diameter pipe shed can no longer meet the requirements

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