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Recyclable prestressed tendon for soft oil support and construction method thereof

A prestressed anchor cable and anchor cable technology, which is applied in excavation, foundation structure engineering, sheet pile walls, etc., can solve the problems of resource waste, large engineering volume, and high engineering cost, and achieve convenient soil excavation and high work efficiency , The effect of fast project progress

Active Publication Date: 2010-04-14
SHANGHAI ZHIPING FOUNDATION ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Recyclable prestressed tendon for soft oil support and construction method thereof
  • Recyclable prestressed tendon for soft oil support and construction method thereof
  • Recyclable prestressed tendon for soft oil support and construction method thereof

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Embodiment 1

[0028] See attached Figure 4 ~ attached Image 6 , the present invention proceeds according to the following steps:

[0029] (1) Positioning

[0030] Excavate the earthwork to -3.000 meters, measure the elevation, and draw a mark on the retaining pile 11. The drilling rig is in place accurately, the base is flat, the inclination angle of the drill pipe is 30°, and the angle deviation is not greater than 1 degree, the height difference does not exceed 5cm.

[0031] (2) Pile

[0032] Wet pile formation is adopted, the cement soil is mixed with rotary spraying, and the diameter is expanded by repeated spraying within 3 meters from the bottom of the pile to ensure that the diameter of the pile bottom is not less than Φ800mm, and the hole forming depth is 0.5 meters longer than the design depth. The ratio is 0.75:1, the pump pressure is 20Mpa, the amount of cement is 75kg per meter, and the design value of the 28-day unconfined compressive strength of cement and soil is q u ≥...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74E02D17/04
Inventor 陈富海凌振健唐红书
Owner SHANGHAI ZHIPING FOUNDATION ENG CO LTD
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