CN210266039U - Active ejection type pile end rear grouting valve - Google Patents

Active ejection type pile end rear grouting valve Download PDF

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Publication number
CN210266039U
CN210266039U CN201921301602.5U CN201921301602U CN210266039U CN 210266039 U CN210266039 U CN 210266039U CN 201921301602 U CN201921301602 U CN 201921301602U CN 210266039 U CN210266039 U CN 210266039U
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China
Prior art keywords
sleeve
pile
grouting
piles
post
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Active
Application number
CN201921301602.5U
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Chinese (zh)
Inventor
王涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cabr Foundation Engineering Co ltd
China Academy of Building Research CABR
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Cabr Foundation Engineering Co ltd
China Academy of Building Research CABR
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Priority to CN201921301602.5U priority Critical patent/CN210266039U/en
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Abstract

The utility model relates to the technical field of pile foundation post-grouting, in particular to an active ejection type pile end post-grouting valve, which comprises an outer sleeve, wherein the upper end of the outer sleeve is spirally connected with a grouting conduit; an inner sleeve is coaxially arranged in the outer sleeve, an annular cavity is formed between the outer sleeve and the inner sleeve, slurry escape holes are formed in the wall of the inner sleeve at intervals in the radial direction, and a double-layer rubber sleeve is pressed on the outer wall of the inner sleeve; the bottom of the inner sleeve is fixed in the outer sleeve through a sealing ring; the bottom of the inner sleeve is connected with a plugging conical tip which is positioned in the bottom of the outer sleeve, and the bottom of the outer sleeve is sealed by an outer sleeve sealing rubber sleeve. The utility model provides an initiative launch formula stake end back slip casting valve, the structure principle is simple, directly perceived, and technical practicality is reliable, and economic benefits is showing. The method is particularly suitable for post-treatment processes of pile-type foundation piles such as cast-in-place piles, precast piles, composite carrier piles, CFG piles and the like. Its advantages are no need of clean water to open plug, and no damage to grout.

Description

Active ejection type pile end rear grouting valve
Technical Field
The utility model relates to a slip casting technical field behind the pile foundation is a one-way check valve for slip casting behind pile foundation pile end among the construction engineering specifically is slip casting valve behind the formula pile end is launched in initiative.
Background
post-Cast-in-place pile grouting (abbreviated as PPG) is an auxiliary construction method for Cast-in-place pile grouting. The technology aims to solidify sediment (soil deficiency) and mud skin through post-grouting at the bottom of the pile, and reinforce the soil body at the bottom of the pile and in a certain range around the pile, so as to greatly improve the bearing capacity of the pile, enhance the quality stability of the pile and reduce the settlement of a pile foundation. The practical results show that the pile forms of drilling, hole digging cast-in-place piles, precast piles, CFG piles, carrier piles and the like all obtain good results. The technology is applied to thousands of pile foundation projects in more than twenty provinces and cities across the country at present.
The traditional tubular one-way grouting vertical valve is provided with a complicated grouting preloading box, a grouting bag and a U-shaped grouting pipe, and the operation process is complicated. Open grouting is implemented, and a grouting valve is easily wrapped by pile body hardened concrete under the condition of dry operation hole forming or under the condition of pressure filling pile forming, so that measures such as water clearing and plugging or stone filling before pile body concrete is hardened are usually adopted for compensation.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides an initiative launch formula stake end back slip casting valve constructs to be different from traditional conventional slip casting valve device for processing and simple installation, the cost is lower, the reliability is high.
The active ejection type pile end rear grouting valve comprises an outer sleeve, wherein the upper end of the outer sleeve is spirally connected with a grouting guide pipe; an inner sleeve is coaxially arranged in the outer sleeve, an annular cavity is formed between the outer sleeve and the inner sleeve, slurry escape holes are formed in the wall of the inner sleeve at intervals in the radial direction, and a double-layer rubber sleeve is pressed on the outer wall of the inner sleeve; the bottom of the inner sleeve is fixed in the outer sleeve through a sealing ring; the bottom of the inner sleeve is connected with a plugging conical tip which is positioned in the bottom of the outer sleeve, and the bottom of the outer sleeve is sealed by an outer sleeve sealing rubber sleeve.
Furthermore, a protective braided fabric is coated outside the outer cylinder sealing rubber sleeve. The inner sleeve slides downwards along the axial lead in the outer sleeve; the lower end of the inner wall of the outer sleeve and the upper end of the outer wall of the inner sleeve are respectively provided with a limiting block, so that the inner sleeve is prevented from being separated from the lower end of the outer sleeve.
The utility model provides an initiative launch formula stake end back slip casting valve, the structure principle is simple, directly perceived, and technical practicality is reliable, and economic benefits is showing. The method is particularly suitable for post-treatment processes of pile-type foundation piles such as cast-in-place piles, precast piles, composite carrier piles, CFG piles and the like. Its advantages are no need of clean water to open plug, and no damage to grout.
Drawings
The invention is described in detail below with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of the device of the present invention.
Fig. 2 is a schematic structural view of the utility model in the state of grouting ejection.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the active ejection type pile end rear grouting valve comprises an outer sleeve 1, wherein a grouting conduit is spirally connected to the upper end of the outer sleeve 1; an inner sleeve 2 is arranged in the outer sleeve 1 along the same axial line, an annular cavity is formed between the outer sleeve 1 and the inner sleeve 2, and the inner sleeve 2 slides downwards in the outer sleeve 1 along the axial line; the lower end of the inner wall of the outer sleeve 1 and the upper end of the outer wall of the inner sleeve 2 are respectively provided with a limiting block 4 to prevent the inner sleeve 2 from separating from the lower end of the outer sleeve 1; the wall of the inner sleeve 2 is provided with slurry escape holes 3 at intervals in the radial direction, and the outer wall of the inner sleeve 2 is pressed with a double-layer rubber sleeve 5; the bottom of the inner sleeve 2 is fixed in the outer sleeve 1 through a sealing ring 6; the bottom of the inner sleeve 2 is connected with a plugging conical tip 7, the plugging conical tip 7 is positioned in the bottom of the outer sleeve 1, the bottom of the outer sleeve 1 is sealed by an outer sleeve sealing rubber sleeve 8, and a protective braided fabric 9 is coated outside the outer sleeve sealing rubber sleeve 8.
The pile end grouting valve is of a double-layer sleeve structure and has a one-way check function. The two layers of sleeves can slide and stretch out and draw back, a sealing ring 6 is arranged between the two layers of sleeves to serve as a sealing water stop rubber ring, and a waterproof rubber mold is arranged at the bottom of the outer sleeve 1 to serve as an outer cylinder sealing rubber sleeve 8. The periphery of the inner sleeve 2 is provided with a pulp escape hole 3 which is externally coated with a double-layer rubber sleeve 5.
The outer cylinder of the active ejection type pile end rear grouting valve is sheathed with a screw and is spirally connected with a vertical grouting guide pipe, and the cast-in-place pile together with a reinforcement cage is sunk into the bottom of a pile hole. After the pile body has stable strength (after the cast-in-place pile is formed for 2 days, the precast pile can be free from the limitation).
And after grouting is carried out, the inner sleeve 2 breaks the outer cylinder sealing rubber sleeve 8 under high-strength grouting pressure to penetrate into a pile end rock-soil body or sediment, grout flows out along the grout outlet hole 3 and is injected into the pile end rock-soil body, and grouting is carried out without breaking pile body concrete, so that grouting is not required to be carried out within 2 days of pile forming, crossing with pile forming operation is avoided, and meanwhile, hidden danger caused by steel bar corrosion due to the fact that a pile body concrete protective layer is broken is avoided.
The active ejection type pile end rear grouting valve can bear deep high water head pressure without being damaged, prevent mud and sand from flowing into the pipe to block, and enable slurry to be smoothly discharged without backflow. The design of double-deck sleeve structure has ensured that inlayer slip casting sleeve can pop out and implement the slip casting under the condition that outer slip casting sleeve is wrapped up by the concrete.

Claims (3)

1. The active ejection type pile end rear grouting valve is characterized by comprising an outer sleeve (1), wherein the upper end of the outer sleeve (1) is spirally connected with a grouting guide pipe; an inner sleeve (2) is arranged in the outer sleeve (1) along the same axial lead, an annular cavity is formed between the outer sleeve (1) and the inner sleeve (2), and the inner sleeve (2) slides downwards along the axial lead in the outer sleeve (1); slurry releasing holes (3) are formed in the wall of the inner sleeve (2) at intervals in the radial direction, and a double-layer rubber sleeve (5) is pressed on the outer wall of the inner sleeve (2); the bottom of the inner sleeve (2) is fixed in the outer sleeve (1) through a sealing ring (6); the bottom of the inner sleeve (2) is connected with a plugging conical tip (7), the plugging conical tip (7) is positioned in the bottom of the outer sleeve (1), and the bottom of the outer sleeve (1) is sealed by an outer sleeve sealing rubber sleeve (8).
2. The active ejection type pile-end post grouting valve as claimed in claim 1, characterized in that the outer cylinder sealing rubber sleeve (8) is coated with a protective braided fabric (9).
3. The active ejection type pile-end post grouting valve as claimed in claim 1, wherein the lower end of the inner wall of the outer sleeve (1) and the upper end of the outer wall of the inner sleeve (2) are respectively provided with a limiting block (4) to prevent the inner sleeve (2) from separating from the lower end of the outer sleeve (1).
CN201921301602.5U 2019-08-13 2019-08-13 Active ejection type pile end rear grouting valve Active CN210266039U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921301602.5U CN210266039U (en) 2019-08-13 2019-08-13 Active ejection type pile end rear grouting valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921301602.5U CN210266039U (en) 2019-08-13 2019-08-13 Active ejection type pile end rear grouting valve

Publications (1)

Publication Number Publication Date
CN210266039U true CN210266039U (en) 2020-04-07

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ID=70017193

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921301602.5U Active CN210266039U (en) 2019-08-13 2019-08-13 Active ejection type pile end rear grouting valve

Country Status (1)

Country Link
CN (1) CN210266039U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549782A (en) * 2020-05-14 2020-08-18 中铁南方投资集团有限公司 Equipment for enlarging grouting reinforcement range

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549782A (en) * 2020-05-14 2020-08-18 中铁南方投资集团有限公司 Equipment for enlarging grouting reinforcement range

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