CN112695742B - Precast pile and grouting method - Google Patents
Precast pile and grouting method Download PDFInfo
- Publication number
- CN112695742B CN112695742B CN202011241092.4A CN202011241092A CN112695742B CN 112695742 B CN112695742 B CN 112695742B CN 202011241092 A CN202011241092 A CN 202011241092A CN 112695742 B CN112695742 B CN 112695742B
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- grouting
- pipe
- precast pile
- slurry
- shell
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Abstract
The invention relates to a precast pile grouting method, which comprises the steps of driving a grouting precast pile into a soil layer by pile sinking equipment to form a bottom pile, and in the process, marking a plurality of longitudinal slurry grooves by a ground breaking piece at the periphery of a precast pile body; butting another precast pile at the upper end of the foundation pile, driving the foundation pile into a soil layer, butting other precast piles one by one to finish piling, and butting and extending the slurry supply pipes section by section to the ground surface; and sending the slurry into the grouting box from the slurry supply pipe, breaking the fragile points under the action of the self weight and the pressure difference of the slurry, enabling the grouting pipe to enter the slurry tank from the extension hole until the designed grouting amount enters a soil layer, and grouting the earth surface by grouting to finish the grouting operation.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a precast pile and a grouting method.
Background
The existing precast pile grouting technology is described in patent number 201310527345.8 and patent name precast pile and grouting method: and (3) utilizing a grouting pipe to press and inject a part of concrete (cement paste should be) into the foundation, turning up a part of concrete along the outer wall of the precast pile under the action of a slurry turning basin, finishing high-pressure grouting when the pressure of the concrete which is mixed and turned up around the outer wall of the precast pile reaches a set pressure value, and extracting the grouting pipe. In practical application, at the stake in-process down, the extrusion forms comparatively closely knit soil layer between the outer wall of precast pile and the soil layer, turns over the thick liquid in-process, and grout irregularly flows under the effect of grouting pressure, causes the thick liquid to pile up at the part easily, and there is not the problem of thick liquid in other positions for structural strength is not enough after the thick liquid solidifies.
Disclosure of Invention
The invention aims to provide a precast pile with more uniform slurry ejection and a grouting method, which are realized by the following technical scheme:
a precast pile comprises a precast pile body, a grouting device, a ground breaking piece and a slurry supply pipe, wherein the middle part of the precast pile body is longitudinally communicated, the grouting device is fixedly arranged at the lower end of the precast pile body, and the ground breaking piece is fixedly connected to the bottom of the grouting device; the ground breaking piece is sharp and is formed by welding a plurality of triangular iron sheets, and the width of the ground breaking piece is greater than that of the grouting device; the grouting device comprises a shell, a grouting box, a connecting piece, a grout inlet pipe and a grouting pipe, wherein the grouting box is vertically and fixedly suspended in the shell through the connecting piece, and the middle part of the connecting piece is provided with a fragile point which is easy to break under tension; one end of the grout inlet pipe is connected with the grouting box, and the other end of the grout inlet pipe penetrates through the upper wall of the shell and extends to the outside of the shell; the vertical side wall of the grouting box is provided with a plurality of inserting holes, the grouting pipe is elastically inserted in the inserting holes, one end of the grouting pipe is positioned in the grouting box, the other end of the grouting pipe elastically abuts against the side wall of the shell, and the side wall of the shell is provided with an extending hole positioned below the corresponding end part of the grouting pipe; the slurry supply pipe longitudinally extends from the upper end to the lower end of the precast pile body and is connected with the slurry inlet pipe.
The precast pile is further designed in that the grout inlet pipe is a flexible pipe or a telescopic pipe which can be curled.
The precast pile is further designed in a way that the bottom wall of the shell is provided with a guide groove which is matched with the grouting box.
The precast pile is further designed in that the middle of the grouting pipe is provided with a longitudinally arranged pore passage, and the front part and the rear part of the grouting pipe are respectively provided with a slurry outlet hole and a slurry inlet hole which are communicated with the pore passage.
The precast pile is further designed in that the connecting piece is a straight pipe, and an annular groove is formed in the outer wall of the upper portion of the straight pipe, so that the wall thickness of the straight pipe at the annular groove is thin, and the fragile point is formed.
The precast pile is further designed in that the grout inlet pipe penetrates through the inside of the connecting piece from the outside of the shell to be connected with the grouting box.
A precast pile grouting method adopts a precast pile, the precast pile comprises a precast pile body, a grouting device, a ground breaking part and a slurry supply pipe, the middle part of the precast pile body is longitudinally communicated, the grouting device is fixedly arranged at the lower end of the precast pile body, and the ground breaking part is fixedly connected to the bottom of the grouting device; the ground breaking part is sharp and is formed by welding a plurality of triangular iron sheets, and the width of the ground breaking part is larger than that of the grouting device; the grouting device comprises a shell, a grouting box, a connecting piece, a grout inlet pipe and a grouting pipe, wherein the grouting box is vertically and fixedly suspended in the shell through the connecting piece, and the middle part of the connecting piece is provided with a fragile point which is easy to break under tension; one end of the grout inlet pipe is connected with the grouting box, and the other end of the grout inlet pipe penetrates through the upper wall of the shell and extends to the outside of the shell; the vertical side wall of the grouting box is provided with a plurality of inserting holes, the grouting pipe is elastically inserted in the inserting holes, one end of the grouting pipe is positioned in the grouting box, the other end of the grouting pipe elastically abuts against the side wall of the shell, and the side wall of the shell is provided with an extending hole positioned below the corresponding end part of the grouting pipe; the slurry supply pipe longitudinally extends from the upper end to the lower end of the precast pile body and is connected with the slurry inlet pipe; driving the precast pile into a soil layer by pile sinking equipment to form a bottom pile, and in the process, marking a plurality of longitudinal slurry grooves on the periphery of the precast pile body by the ground breaking piece; butting another precast pile at the upper end of the foundation pile, driving the foundation pile into a soil layer, butting other precast piles one by one to finish piling, and butting and extending the slurry supply pipes section by section to the ground surface; and sending the slurry into the grouting box from the slurry supply pipe, breaking the fragile points under the action of the self weight and the pressure difference of the slurry, enabling the grouting pipe to enter the slurry tank from the extension hole until the designed grouting amount enters a soil layer, and grouting the earth surface by grouting to finish the grouting operation.
The invention has the beneficial effects that:
in the pile driving process, the ground breaking part enters the soil layer to cut around the prefabricated pile body to form a slurry tank, and the slurry tank corresponds to a grouting pipe of a grouting device, so that slurry is uniformly injected around the pile body to form a better grouting effect; the slip casting is original, the thick liquid is from going into the thick liquid pipe entering slip casting box, thereby the slip casting box leads to the breakable point fracture of box body weight gain because the increase of thick liquid, the slip casting box sinks in the shell, thereby the inner wall lapse of slip casting pipe edge shell extends the shell outside from stretching out the hole under the effect of elasticity and inserts, along with the continuation increase of thick liquid, the thick liquid is from the outside diffusion of slip casting pipe to the shell from getting into the soil layer under the effect of pressure, because the slip casting pipe distributes evenly, consequently, the diffusion of thick liquid in the soil layer is also relatively even, thereby the fixed effect to the precast pile after the thick liquid solidifies is better.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the internal structure of the grouting device.
Detailed Description
The invention is further illustrated by the following figures and examples in conjunction with the description:
the precast pile comprises a precast pile body 1, a grouting device 2, a ground breaking part 3 and a slurry supply pipe 4, wherein the middle part of the precast pile body is longitudinally communicated, the grouting device is fixedly arranged at the lower end of the precast pile body, and the ground breaking part is fixedly connected to the bottom of the grouting device; the ground breaking piece is sharp and is formed by welding a plurality of triangular iron sheets, and the width of the ground breaking piece is greater than that of the grouting device; the grouting device comprises a shell 21, a grouting box 22, a connecting piece 23, a grout inlet pipe 24 and a grouting pipe 25, wherein the grouting box 22 is vertically and fixedly suspended in the shell through the connecting piece 23, and the middle part of the connecting piece is provided with a fragile point 231 which is easy to break under the pulling force; one end of the grout inlet pipe 24 is connected with the grouting box, and the other end of the grout inlet pipe penetrates through the upper wall of the shell and extends to the outside of the shell; the vertical side wall of the grouting box is provided with a plurality of inserting holes, the grouting pipe 25 is elastically inserted into the inserting holes, one end of the grouting pipe is positioned in the grouting box, the other end of the grouting pipe elastically abuts against the side wall of the shell, and the side wall of the shell is provided with an extending hole 211 positioned below the corresponding end part of the grouting pipe. The grout supply pipe longitudinally extends from the upper end to the lower end of the precast pile body and is connected with the grout inlet pipe.
The grouting method of the precast pile comprises the following steps: driving the precast pile into a soil layer by pile sinking equipment to form a bottom pile, and in the process, marking a plurality of longitudinal slurry grooves on the periphery of the precast pile body by the ground breaking piece; butting another precast pile at the upper end of the foundation pile, driving the foundation pile into a soil layer, butting other precast piles one by one to finish piling, and butting and extending the slurry supply pipes section by section to the ground surface; send into the thick liquid from supplying thick liquid pipe to the slip casting box, the thick liquid is from going into in the thick liquid pipe gets into the slip casting box, thereby the slip casting box is because the increase of thick liquid leads to the box body to increase weight and breakable point fracture, the slip casting box sinks in the shell, thereby the slip casting pipe stretches out the hole from stretching out to the shell outside under the effect of elasticity and inserts, increase along with the continuation of thick liquid, the thick liquid is from the outside diffusion of slip casting pipe to the shell from getting into the soil layer under the effect of pressure, because the slip casting pipe distributes evenly, consequently, the diffusion of thick liquid in the soil layer is also relatively even, thereby the thick liquid solidifies the back is better to the fixed effect of precast pile, get into the soil layer to design grouting volume, earth's surface effluvium accomplishes the slip casting operation.
Specifically, the slurry inlet pipe 24 is a flexible pipe or a telescopic pipe. After the connecting piece 23 is broken, the grout inlet pipe can be elastically stretched under the action of gravity, and the grout can enter the grouting box 22 through the grout inlet pipe. The bottom wall of the shell is provided with a guide groove matched with the grouting box, so that the stable falling process of the grouting box is ensured, and the grouting pipe 25 can be smoothly extended out of the shell. The middle part of the grouting pipe is provided with a pore canal which is longitudinally arranged, and the front part and the rear part of the grouting pipe are respectively provided with a grout outlet and a grout inlet which are communicated with the pore canal. The slurry enters the pore channel through the slurry inlet hole on the grouting pipe and is discharged from the slurry outlet hole.
Specifically, the connecting piece is a straight pipe, and an annular groove is formed in the outer wall of the upper portion of the straight pipe, so that the wall thickness of the straight pipe at the annular groove is thin, and the fragile point is formed. The grout inlet pipe penetrates through the inside of the connecting piece from the outside of the shell and is connected with the grouting box. In an initial state, the grouting box is an empty box, is light in weight and can be stably connected to the lower end of the connecting piece; after the grout enters the grouting box, the grouting box is weighted, the connecting piece is rapidly broken from the fragile point, and the grouting box is sunk at the bottom of the shell.
Claims (2)
1. A precast pile is characterized by comprising a precast pile body, a grouting device, a ground breaking part and a slurry supply pipe, wherein the middle part of the precast pile body is longitudinally communicated, the grouting device is fixedly arranged at the lower end of the precast pile body, and the ground breaking part is fixedly connected to the bottom of the grouting device; the ground breaking piece is sharp and is formed by welding a plurality of triangular iron sheets, and the width of the ground breaking piece is greater than that of the grouting device; the grouting device comprises a shell, a grouting box, a connecting piece, a grout inlet pipe and a grouting pipe, wherein the grouting box is vertically and fixedly suspended in the shell through the connecting piece, and the middle part of the connecting piece is provided with a fragile point which is easy to break under tension; one end of the grout inlet pipe is connected with the grouting box, and the other end of the grout inlet pipe penetrates through the upper wall of the shell and extends to the outside of the shell; the vertical side wall of the grouting box is provided with a plurality of inserting holes, the grouting pipe is elastically inserted in the inserting holes, one end of the grouting pipe is positioned in the grouting box, the other end of the grouting pipe elastically abuts against the side wall of the shell, and the side wall of the shell is provided with an extending hole positioned below the corresponding end part of the grouting pipe; the slurry supply pipe longitudinally extends from the upper end to the lower end of the precast pile body and is connected with the slurry inlet pipe; the pulp inlet pipe is a flexible pipe or an extension pipe which can be curled; the bottom wall of the shell is provided with a guide groove matched with the grouting box; the middle part of the grouting pipe is provided with a longitudinally arranged pore passage, and the front part and the rear part of the grouting pipe are respectively provided with a grout outlet and a grout inlet which are communicated with the pore passage; the connecting piece is a straight pipe, and an annular groove is formed in the outer wall of the upper part of the straight pipe, so that the wall thickness of the straight pipe at the annular groove is thinner, and the fragile point is formed; the grout inlet pipe penetrates through the inside of the connecting piece from the outside of the shell and is connected with the grouting box.
2. A precast pile grouting method using the precast pile of claim 1, characterized in that the precast pile is driven into the soil layer by pile sinking equipment to form a bottom pile, and in the process, the ground breaking member is scribed around the precast pile body to form a plurality of longitudinal grout grooves; butting another precast pile at the upper end of the foundation pile, driving the foundation pile into a soil layer, butting other precast piles one by one to finish piling, and butting and extending the slurry supply pipes section by section to the ground surface; and sending the slurry into the grouting box from the slurry supply pipe, breaking the fragile points under the action of the self weight and the pressure difference of the slurry, enabling the grouting pipe to enter the slurry tank from the extension hole until the designed grouting amount enters a soil layer, and grouting the earth surface by grouting to finish the grouting operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011241092.4A CN112695742B (en) | 2020-11-09 | 2020-11-09 | Precast pile and grouting method |
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| CN202011241092.4A CN112695742B (en) | 2020-11-09 | 2020-11-09 | Precast pile and grouting method |
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| CN112695742A CN112695742A (en) | 2021-04-23 |
| CN112695742B true CN112695742B (en) | 2022-07-08 |
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| CN115387322B (en) * | 2022-04-19 | 2023-08-04 | 西南石油大学 | Multi-angle grouting soil body reinforcing device for helping slurry global diffusion |
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| CN101215836B (en) * | 2007-12-29 | 2010-07-21 | 雷玉华 | Construction machinery used for large diameter hollow pile and its construction method and use |
| CN103603336B (en) * | 2013-10-31 | 2017-01-11 | 周兆弟 | Grouting precast pile and grouting method |
| CN104234055B (en) * | 2014-09-24 | 2016-09-14 | 顾孙平 | A kind of prefabricated pile post-grouting device and technique thereof |
| CN109372039B (en) * | 2018-12-21 | 2023-11-03 | 中电建十一局工程有限公司 | Concrete cast-in-place pile bearing capacity detection device and detection method |
| CN111042142B (en) * | 2019-12-29 | 2021-09-28 | 福建建中建设科技有限责任公司 | Post-grouting construction and grouting failure processing device for pile end |
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