A cast-in-place bored pile construction method

By using drilling casing and leaving casing in place, the influence of groundwater is isolated, which improves the construction quality of bored piles in high-altitude and high-pressure water environments. It solves the problems of borehole wall instability and concrete segregation caused by groundwater intrusion, and improves the stability and durability of the pile body.

CN122428641APending Publication Date: 2026-07-21ROAD & BRIDGE INT CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ROAD & BRIDGE INT CO LTD
Filing Date
2026-04-29
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Under conditions of high altitude and high-pressure water, groundwater inflow into the bored pile construction process can cause instability of the borehole wall, sediment accumulation at the bottom of the borehole, and segregation of underwater concrete grout, which seriously affects the quality and safety of the pile.

Method used

Drilling casing is used to isolate the confined aquifer during the drilling process. After passing through, the casing is left to form an isolation barrier to prevent groundwater from entering the pile hole. The concrete grouting is carried out in stages to ensure the quality of pile formation.

Benefits of technology

This effectively prevents groundwater from eroding and corroding the pile holes, improves the quality of pile formation, ensures the quality of concrete setting, and enhances the stability and service life of the pile body.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a cast-in-situ bored pile construction method and relates to the technical field of building engineering. The method comprises the following steps: driving a drilling casing to perform a drilling operation; observing the change of the pressure water head at the upper end of the drilling casing and recording the depth when the pressure water head disappears; after the size of the lower end of the drilling casing penetrating through the confined water layer reaches a target size, stopping the drilling operation, placing a remaining casing into the drilling casing, and arranging the remaining casing corresponding to the confined water layer; placing a steel reinforcement cage into the drilling casing and pouring concrete slurry; and pulling out the drilling casing from the pile hole. When the drilling casing penetrates through the confined water layer, the drilling casing can isolate the connection between the confined water layer and the pile hole, and the remaining casing can isolate the underground water layer and the pile hole in the whole service period of the pile body, so that the technical effect of improving the pile forming quality is achieved.
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