Construction equipment and method for post-grouting reinforcement of U-shaped pipe in core hole

Abstract

The present application discloses a post-grouting reinforcement construction equipment for a U-shaped pipe in a coring hole, which includes: a U-shaped grouting pipe, which has a U-shaped body part inserted into the coring hole in the concrete pile body, and the U-shaped The body part includes a bottom turning part and a grout inlet pipe section and a grout outlet pipe section extending parallelly upward from the bottom turn part, and the U-shaped grouting pipe also has a grout inlet port connected to the upper ends of the grout inlet pipe section and the grout outlet pipe section respectively and a slurry port; a drainage pipe, which is partially inserted into the coring hole; and a grouting machine, which is connected to the grouting port; wherein, the U-shaped grouting pipe and the drainage pipe pass through the upper part of the core hole The sealing section is fixed to the concrete pile body. Also disclosed is a method for multiple cycle grouting by utilizing the post-grouting reinforcement construction equipment. This application can significantly improve the grouting effect.

Description

technical field [0001] This application relates to post-grouting reinforcement construction equipment and methods for pile foundations in bridges and construction fields, and in particular to construction equipment and methods for setting U-shaped grouting pipes in pile foundation core holes and reinforcing pile foundations through multiple grouting method. Background technique [0002] In the past, in most cases, the grouting at the bottom of the pile was to pre-embed the grouting pipe during the construction of the pile foundation. After the pile foundation was poured, the pile bottom or pile side grouting was performed to improve the compactness of the foundation soil. way to increase the carrying capacity. For the pile foundation that has been constructed, if you want to carry out grouting at the bottom of the pile, the most effective way is to use figure 1 In the shown equipment, the core hole 3 is drilled from top to bottom along the direction of the concrete pile bo...

AI Technical Summary

Problems solved by technology

This grouting process can only be performed before the initial setting of the cement slurry, once the initial setting, it is impossible to perform grouting again

[0003] Tests have shown that after grouting reaches a certain pressure, the grout will first develop along the weakest direction in the soil of the foundation soil layer 2, that is, the grout will first fill the weak interlayer or the part of the soil with high porosity. Larger, the grout will continue to develop along the weak interlayer, and it is difficult to increase the grouting pressure in a short time

If only one grouting is performed, it is difficult to fill the grout evenly around the grouting point, and it can only be filled in a certain weak direction, which not only fails to achieve the expected grouting effect, but also causes a large waste of material

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