Method for preventing sinking of hole opening protective cylinder of slurry retaining wall hole forming cast-in-place pile

Abstract

The invention discloses a method for preventing sinking of a hole opening protective cylinder of a slurry retaining wall hole forming cast-in-place pile. The method comprises the specific processes that two cylinder protecting flanges are arranged on the upper portion of the outer wall of the hole opening protective cylinder, and a gap is reserved between the cylinder protecting flanges; a groovefor storing a reinforcement cage hanging device is formed in the top end of the hole opening protective cylinder; and slurry overflow ports are formed in the side wall of the hole opening protective cylinder and formed corresponding to the gap between the two cylinder protecting flanges. According to the method, the accuracy that the top elevation of the hole opening protective cylinder is adoptedas control over the temporary pile hole depth and the reinforcement cage elevation on site is guaranteed, and at the same time, it is guaranteed that the protective cylinder can be normally pulled upand move; and meanwhile the situation that subsequent concrete guide pipe putting-down arrangement is influenced by steel pipe hanging is avoided.

Description

technical field [0001] The invention relates to a method for preventing the sinking of hole casings by mud retaining wall forming hole filling piles in construction projects, municipal highway projects and other infrastructure projects. Background technique [0002] At present, it has become normal to use concrete pouring pile foundation and retaining pile support structure for foundation construction, and due to the limitation of geological and hydrological conditions or other factors, it is necessary to use the technology of mud retaining wall forming hole pouring pile. After the site is leveled, it will be used as the construction plane of the pile machine. During the construction of cast-in-situ piles, the height of the void is controlled, thereby controlling the length and elevation of the pile body. During the construction of the mud retaining wall into the hole-filled pile, it is necessary to install the hole casing to position the pile hole and stabilize the soil lay...

AI Technical Summary

Problems solved by technology

[0003] 1) On-site construction is generally controlled according to the elevation of the top of the casing, such as the depth of the pile hole and the positioning of the reinforcement cage. Due to the unlimited position of the hole casing, there is an inevitable gap between the pile driver rod and the casing during the pile hole construction process. Collision, causing the casing to sink, resulting in inaccurate control of the depth of the pile hole and the elevation of the reinforcement cage;

[0004] 2) Due to the excessive weight of the reinforcement cage, the suspension of the reinforcement cage on the hole casing will inevitably cause the casing to sink, resulting in the elevation of the reinforcement cage being lower than the design elevation. layers, resulting in quality defects of cast-in-place piles

[0005] 3) The steel casing cannot be pulled up normally due to sinking into the soil layer, resulting in an increase in the cost of pulling up or a waste of the casing discarded

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