Recyclable prestressed tendon for soft oil support and construction method thereof

Abstract

The invention discloses a recyclable prestressed tendon for soft oil support and a construction method thereof. The prestressed tendon comprises: an anchor plate, a steel strand, an anchor end lock and loaded plates, wherein the anchor plate is circular and one side of the plate is provided with a plurality of loaded plate and strand holes evenly along the periphery, and the circle center of the plate is provided with a grouting hole; the anchor end lock is tubular and fixedly arranged on the strand hole at one side of the anchor plate; the loaded plate takes the shape of a vane and is movably connected with the anchor by a hinge; two sides of the hinge are provided with a limit plate fixedly connected with the anchor plate; and the steel strand penetrates into the strand hole to be compressed and connected with the anchor end lock fixedly arranged on the anchor plate. The construction method includes the following steps: digging a base pit and forming pores; arranging the tendon; locking the tendon; and recovering the steel strand. The prestressed tendon and the method are simple in structure and convenient for construction and compared with the prior art, have the advantages of no support structure in the base pit, convenience for digging soil body, no problems that underground barriers appear and building construction crosses the building line, the recyclable tendon for support, fast progress of works and high work efficiency.

Description

technical field [0001] The invention relates to the technical field of foundation pit enclosure protection of building structures, in particular to a recyclable soft soil support prestressed anchor cable suitable for excavation depth within 10m and a construction method thereof. Background technique [0002] At present, the excavation of foundation pits generally adopts the construction method of cable-stayed anchors or the combination of support and enclosure structure, such as steel support, concrete support, row piles, and SMW pile enclosure structure. This construction method is expensive. , and the supporting enclosure structure affects the excavation of the foundation pit, the excavation of the soil is very inconvenient, and there are column piles in the foundation pit. After the support is completed, the support and column piles need to be removed. produce adverse effects. In soft soil support, the existing technology uses cable-stayed anchors instead of support, whi...

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Problems solved by technology

[0002] At present, the excavation of foundation pits generally adopts the construction method of cable-stayed anchors or the combination of support and enclosure structure, such as steel support, concrete support, row piles, and SMW pile enclosure structure. This construction method is expensive. , and the supporting enclosure structure affects the excavation of the foundation pit, the excavation of the soil is very inconvenient, and there are column piles in the foundation pit. After the support is completed, the support and the column piles need to be removed. adversely affect

In soft soil support, the existing technology uses cable-stayed anchors to replace the support, which are all non-recoverable anchor cables or soil nail wall support. This support method basically exceeds the planned red line. It is Shanghai et al. It is not allowed by the existing local regulations in the area, so it is basically difficult to adopt, and the anchor cable cannot be recycled, resulting in waste of resources and the formation of underground obstacles

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