A Boundary Body Sectional Preloading Construction Method for Friction-type Cast-in-situ Pile in Karst Area

A construction method and technology in karst areas, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as inability to ensure the quality of cast-in-situ piles, and achieve the effect of simple operation

Active Publication Date: 2021-06-22
CHINA RAILWAY SHANGHAI DESIGN INST GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing pressure filling method is overall pressure filling, which cannot effectively control the volume of concrete poured into the cave according to the diameter of the cave, so that the pile quality of the cast-in-place pile cannot be guaranteed

Method used

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  • A Boundary Body Sectional Preloading Construction Method for Friction-type Cast-in-situ Pile in Karst Area
  • A Boundary Body Sectional Preloading Construction Method for Friction-type Cast-in-situ Pile in Karst Area

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Embodiment

[0017] Embodiment: In this embodiment, the boundary body segmental preloading construction method for friction-type cast-in-situ piles in karst areas first cuts off the boundary body 1 and then pressurizes the pile foundation holes in the karst area, thereby controlling the boundary body 1 The ductility in each karst cave can improve the pile body friction of the cast-in-situ pile.

[0018] Such as figure 1 and figure 2 As shown, the segmented preloading device involved in the segmented preloading construction method includes an inflatable cavity 2 , a main charging tube 6 and an auxiliary charging tube 7 .

[0019] Among them, such as figure 2 As shown, due to geological reasons, the pile foundation holes in the karst area will run through multiple karst caves. In order to prevent the concrete from directly diffusing into the karst caves when the pouring piles are poured in the later stage, causing unevenness, a boundary body 1 is placed on the inner wall of the pile foun...

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Abstract

The present invention relates to the technical field of friction cast-in-place piles in karst areas, and in particular to a boundary body segmental preloading construction method for friction-type cast-in-place piles in karst areas. A boundary body for covering karst caves is arranged in pile foundation holes in karst areas. A segmented preloading device is set in the boundary body, and the boundary body is pressurized in sections from bottom to top through the segmented preloading device. Specifically, the boundary body is first separated into mutually independent Connected upper and lower areas, then pressurize the lower area and then grout into the lower area, switch the lower area and upper area into a connected state, and repeat the above steps in sequence until the pouring of the entire pile is completed. The advantages of the present invention are: simple operation, first divide the boundary body into upper and lower regions that are not connected to each other, then pressurize the lower region and then grout the lower region, so that the boundary body can be effectively controlled Extensibility in different caves.

Description

technical field [0001] The invention relates to the technical field of friction-type cast-in-place piles in karst areas, in particular to a segmental boundary body preloading construction method for friction-type cast-in-situ piles in karst areas. Background technique [0002] Friction-type cast-in-situ piles in beaded karst areas mainly rely on the protrusion of pile concrete in the karst cave to provide frictional resistance and achieve the role of bearing the upper load. Due to the different diameters of the caves, the concrete of the pile body has different protrusions in the caves, and the frictional resistance values ​​that can be exerted are also different. Therefore, in the design process, it is necessary to make a targeted design according to the diameter of the caves exposed by the foundation pile holes. The degree of protrusion of the pile material in each cave. [0003] The existing pressurization method is overall pressurization, which cannot effectively contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/34E02D15/04
CPCE02D5/34E02D15/04
Inventor 雷文王其合郑晓慧
Owner CHINA RAILWAY SHANGHAI DESIGN INST GRP
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