Construction method for TRD composite enclosure comprehensive pipe gallery close to river channel

Abstract

The invention relates to a construction method for a TRD composite enclosure comprehensive pipe gallery close to a river channel. The construction method comprises the steps that S1, a guide groove of a TRD enclosure structure is excavated; S2, a working groove of the TRD enclosure structure is excavated along the guide groove; S3, a soil body of a foundation pit is excavated along the inner side of the TRD enclosure structure; S4, a concrete cushion layer and a self-waterproof concrete layer are constructed at the bottom of the foundation pit; and S5, a bottom plate of a cast-in-place pipe gallery is constructed on the self-waterproof concrete layer. The construction method has the beneficial effects that a corner connecting reinforcing steel bar inserted into the corner of the TRD enclosure structure is formed by splicing two pieces of H-shaped steel, the integrity is good, and the bearing capacity and the water sealing performance of the corner of the TRD enclosure structure can be remarkably improved; the adopted unit splicing type riding track is fixed on the side wall of the foundation pit and can be lengthened section by section along with excavation of the foundation pit; and a pull rod is arranged between a bottom steel plate and a top steel plate to guarantee the sealing performance of a steel sleeve and prevent underground water from entering the bottom of the foundation pit through the steel sleeve.

Description

technical field [0001] The invention relates to the construction of an open-cut pipe gallery and an enclosure structure, in particular to a construction method for a TRD composite enclosure comprehensive pipe gallery near a river. Background technique [0002] With the continuous development of urban construction, underground pipelines are gradually moved into the underground comprehensive pipe gallery, so the construction technology of the underground comprehensive pipe gallery is also constantly developing. Due to the large cross-section of the pipe gallery, the open-cut and cast-in-place method is usually used for the construction of the underground comprehensive pipe gallery. Excavation requires a large working space, which is not suitable for the construction of pipe corridors near rivers or existing buildings; the enclosure structure usually adopts SMW piles or TRD (cement-reinforced underground diaphragm wall) enclosure structure, and SMW piles have relatively Good a...

AI Technical Summary

Problems solved by technology

However, during the construction process, it is necessary to excavate the guide ditch, and then cut the soil along the guide ditch to construct the working ditch. During the construction process, the guide ditch and the working ditch are prone to collapse; in addition, it is necessary to insert H-shaped steel into the mixed soil , the H-shaped steel is easy to be inserted, which affects the construction quality of the TRD enclosure structure; since the foundation pit is close to the river, the groundwater level is high, in order to ensure the smooth excavation of the foundation pit, it is necessary to reduce the groundwater by constructing a tube well before excavation

When the bottom of the foundation pit is closed, groundwater will easily flow into the foundation pit from the connection between the bottom of the foundation pit and the tube well, thus affecting the construction safety

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