CN-224227802-U - Composite post grouting device for bored pile

CN224227802UCN 224227802 UCN224227802 UCN 224227802UCN-224227802-U

Abstract

The utility model relates to the field of post grouting of cast-in-situ bored piles, and provides a composite post grouting device of cast-in-situ bored piles, which comprises an annular hollow steel plate, an annular rubber capsule, an annular baffle plate, a grouting pipeline and a grouting pipeline, wherein the annular rubber capsule is arranged right below the hollow steel plate, the annular baffle plate is vertically arranged in an inner ring of the annular rubber capsule downwards, the inner side of the hollow steel plate is connected with the upper end of the annular baffle plate, the grouting pipeline comprises an open grouting pipe and a closed grouting pipe which are symmetrically distributed along the central axis of the annular baffle plate, the tail ends of the open grouting pipe and the closed grouting pipe are slurry outlets, the slurry outlet of the open grouting pipe is arranged in a hollow annular structure, and the slurry outlet of the closed grouting pipe is arranged in the annular rubber capsule. After the bored pile is constructed, the respective advantages of open-close grouting and closed grouting can be better exerted through the open-close-open grouting sequence, the grouting effect is better ensured, and the bearing capacity of the bored pile is improved.

Inventors

YAN CHANG
LIU BIAO
HU YING
CHEN HAI
Tang Rungan
YE HAO
CHENG XIAONI
LUO HONGBO
LIU JIANHAN
TU HANJUN
ZHU QIAO
HU QILONG
LI QI
YU JINGWEN

Assignees

武汉城建建设工程有限公司

Dates

Publication Date: 20260512
Application Date: 20250428

Claims (5)

1. The composite post grouting device for the bored pile is characterized by comprising an annular hollow steel plate, an annular rubber capsule is arranged right below the hollow steel plate, an annular baffle plate is vertically arranged in the annular rubber capsule in an annular mode, the inner side of the hollow steel plate is connected with the upper end of the annular baffle plate, the composite post grouting device further comprises a grouting pipeline, the grouting pipeline comprises two open grouting pipes and two closed grouting pipes which are symmetrically arranged along the central axis of the annular baffle plate, the tail ends of the open grouting pipes and the closed grouting pipes are slurry outlets, the slurry outlets of the open grouting pipes are arranged in the hollow annular structure, and the slurry outlets of the closed grouting pipes are arranged in the annular rubber capsule.
2. The bored pile composite type post-grouting device according to claim 1, wherein the hollow annular structure is formed by combining the annular baffle, the hollow steel plate and the annular rubber capsule.
3. A bored pile composite post-grouting apparatus as claimed in claim 2, wherein the two open grouting pipes are bent continuously by a pipe line at the upper end of the hollow steel plate and then extend vertically downwards so that the slurry outlet is disposed in the hollow annular structure.
4. A bored pile composite type post grouting device according to claim 3, wherein the two closed grouting pipes extend into the annular rubber capsule after being horizontally bent along the pipeline near the central axis of the annular baffle plate, form an annular shape, and the slurry outlets of the two closed grouting pipes are positioned in the annular rubber capsule and are symmetrically distributed.
5. A bored pile composite post-grouting apparatus as claimed in claim 4, wherein the open grouting pipe and the closed grouting pipe are provided with one-way valves adjacent to the slurry outlet.

Description

Composite post grouting device for bored pile Technical Field The utility model relates to the field of post grouting of bored piles, and provides a composite post grouting device of bored piles by combining the advantages of open grouting and closed grouting. Background The post grouting technology refers to grouting piles after pile forming for a period of time, grouting cement slurry is injected into a pile end soil layer through a grouting pipe preset in a pile body and a pile end grouting valve connected with the grouting pipe, and the grouting cement slurry enhances the strength of the pile end soil body through the compaction, penetration, splitting and other effects on the pile end soil body and pile end sediment, so that the ultimate bearing capacity of a single pile is improved, and pile top settlement is reduced. The post grouting technology can eliminate sediment at the bottom of the pile and reduce the sedimentation deformation of the pile foundation, so the post grouting technology is widely used in practical engineering. However, the existing pile end grouting is only single open grouting (the pile bottom is provided with a grouting rubber capsule cavity) or single closed grouting (the pile bottom is provided with a grouting rubber capsule cavity), the grouting area of the open grouting in some strata is low in controllability, the grouting liquid can randomly flow along cracks in sand, soil and crushed stone layers under the action of high pressure, the grouting liquid is not necessarily concentrated at the pile bottom, and grouting pressure and grouting amount are relatively difficult to control. The closed grouting is to squeeze soil around the pile end through a capsule at the bottom of the reinforcement cage, and is mainly compression grouting. That is, the single grouting form cannot control the grouting area, grouting pressure and grouting amount in the grouting process more accurately, the grouting effect stability is poor, and the single pile bearing capacity fluctuation is large. Disclosure of utility model The utility model aims to solve the problem that grouting areas, grouting pressure and grouting amount in the grouting process cannot be accurately controlled in the existing post grouting technology, and provides a composite post grouting device for a bored pile. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The composite back grouting device for the bored pile comprises an annular hollow steel plate, an annular rubber capsule is arranged right below the hollow steel plate, an annular baffle plate is vertically arranged in an inner ring of the annular rubber capsule downwards, the inner side of the hollow steel plate is connected with the upper end of the annular baffle plate, the composite back grouting device further comprises a grouting pipeline, the grouting pipeline comprises two open grouting pipes and two closed grouting pipes which are symmetrically distributed along the central axis of the annular baffle plate, slurry outlets are arranged at the tail ends of the open grouting pipes and the closed grouting pipes, the slurry outlets of the open grouting pipes are arranged in a hollow annular structure, and the slurry outlets of the closed grouting pipes are arranged in the annular rubber capsule. Preferably, the annular baffle plate, the hollow steel plate and the annular rubber capsule are combined to form a hollow annular structure. Further, the two open grouting pipes are continuously bent by a pipeline positioned at the upper end of the hollow steel plate and then vertically extend downwards so that a slurry outlet of the two open grouting pipes is arranged in the hollow annular structure. Furthermore, the two closed grouting pipes extend into the annular rubber capsule after being horizontally bent along the pipeline near the central axis of the annular baffle plate to form an annular shape, and slurry outlets of the two closed grouting pipes are positioned in the annular rubber capsule and are symmetrically distributed. Preferably, the open grouting pipe and the closed grouting pipe are provided with one-way valves near the slurry outlet. Compared with the prior art, the utility model has the beneficial effects that: 1. By means of the pile bottom grouting device and the grouting sequence of open-closed-open, the movement of the grouting liquid in the soil is effectively controlled and restrained, and the principles of localization, quantification and orientation of grouting are realized. 2. Compared with open grouting, the composite post grouting device ensures the effect of compaction grouting of the pile end, can form a cement expansion head at the pile end, expands the supporting area of the pile end and compacts stratum around the pile bottom. 3. Compared with the closed grouting integral steel plate capsule, when the steel reinforcement cage sinks, the bottom annular rubber capsule and the hollow steel