Capsule type pouring and filling method and structure for large-size karst pile foundation construction

Abstract

The invention discloses a capsule type pouring and filling method and structure for large-size karst pile foundation construction. The method includes the steps that A, the karst distribution range and rough dimension are determined through advanced exploration; B, the dimension of a capsular bag is determined according to the diameter of a pile foundation and the karst height, wherein the capsular bag is in a circular truncated cone shape; C, the capsular bag is sewn; D, a small amount of filler is injected into the capsular bag, the capsular bag is slowly placed downwards from the ground into the karst area with a rope along a pile hole; E, light bubble mixed materials are pumped into the capsular bag until the capsular bag is full; and F, the light bubble mixed materials are solidified fast, and construction of the pile foundation is carried out. Structurally, the karst area is distributed in a stratum, the pile foundation penetrates through the karst area and is embedded in the stratum, the pile foundation penetrates through the capsular bag via a cylinder hole in the capsular bag, the capsular bag and the karst area are connected, the capsular bag is filled with the light bubble mixed materials and is in the circular truncated cone shape, and the capsular bag is as high as the karst area. The capsule type pouring and filling method and structure for large-size karst pile foundation construction are reasonable in technology, economical, environmentally friendly, remarkable in effect, and capable of meeting the filling requirement of large-size karst pile foundation construction in karst regions.

Description

technical field [0001] The present invention relates to the technical field of building and civil engineering construction, in particular to a capsule grouting and filling method for large-volume karst pile foundation construction, and also relates to a capsule grouting and filling structure for large-volume karst pile foundation construction, which is suitable for Treatment construction and foundation reinforcement of large-volume karst in karst areas. Background technique [0002] The stability of building foundations in karst areas is seriously affected by cave fissures. The existence of karst reduces the bearing capacity of the foundations and increases the settlement and deformation of the foundations. Therefore, in order to avoid or reduce the adverse effects of karst on the foundation of buildings, improve the bearing capacity of the foundation, reduce the deformation of foundation settlement, and meet the requirements of buildings on the foundation, foundation treatm...

AI Technical Summary

Problems solved by technology

In karst areas, the pile foundation is often used to pass through the karst cave for foundation treatment. The pile foundation lacks a force-transmitting layer within the karst cave. Therefore, it is necessary to perform grouting treatment on the karst cave to provide pile side friction and exert the bearing capacity of the pile. For karst grouting, the grouting material is often filled with the entire cavity of the karst cave. Due to the large volume of the karst, a large amount of filling material is required for filling, and the filling material may also be lost along the penetrating karst, resulting in great waste.

In addition, the complete grouting of karst can not significantly improve the bearing capacity of the pile foundation compared with the grouting within the range that can provide friction around the pile body

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