CN220746981U - Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device - Google Patents

Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device Download PDF

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Publication number
CN220746981U
CN220746981U CN202322483021.0U CN202322483021U CN220746981U CN 220746981 U CN220746981 U CN 220746981U CN 202322483021 U CN202322483021 U CN 202322483021U CN 220746981 U CN220746981 U CN 220746981U
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China
Prior art keywords
medium
belt
grout
anchor rope
rope hole
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CN202322483021.0U
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Inventor
何彦伟
严锫铖
王辉
张文斌
姚泽文
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Shaanxi Construction Engineering Infrastructure Group Co ltd
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Shaanxi Construction Engineering Infrastructure Group Co ltd
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Abstract

The application relates to a triaxial mixing pile water-stop curtain anchor rope hole leaking stoppage sealing device relates to water-stop curtain leak-proof's technical field, including and carry out the grout stopping area of leaking stoppage, with the control assembly who ends the grout stopping area intercommunication, the grout stopping area can be according to the content change volume size of inside medium, control assembly is used for leading in or discharging the medium in the grout stopping area, control assembly includes: the medium box is arranged on the foundation pit and is used for providing a medium; the pipeline is arranged on the medium box and is communicated with the inside of the slurry stopping belt; and a control valve provided on the pipe and for opening or closing the pipe. This application is through placing the grout stop area in the anchor rope hole, then opens the control valve, and the medium case lets in the medium through the pipeline to grout stop area for grout stop area volume increase and support tightly on the anchor rope hole inside wall, make grout stop area seal the anchor rope hole, then pour concrete into the anchor rope hole in, leak stoppage is carried out the anchor rope hole under the effect of liquid pressure, so that reduce the anchor rope hole probability of leaking of anchor.

Description

Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device
Technical Field
The application relates to the technical field of waterproof curtain leakage prevention, in particular to a waterproof device for a waterproof curtain anchor cable hole of a triaxial mixing pile.
Background
When the excavation depth of the foundation pit is larger than the ground water level height of the field, the water-stop curtain is often required to be arranged, and the triaxial mixing pile is mainly used in China at present. In partial high water level areas, in order to reduce engineering cost, foundation pit support is usually in the form of slope protection piles, anchor cable rods and waterproof curtain support, the anchor cable rods are firstly driven through the waterproof curtain of the triaxial mixing pile in the construction process, and after the anchor cable rods are completed, plugging and water stopping work is required to be carried out on the anchor cable holes of the triaxial mixing pile.
In the practical application process, the anchor cable hole in the original construction is communicated with the water-bearing rock stratum, so that the anchor cable hole is drained, the anchoring agent which is solidified in an ultrafast way is generally adopted for grouting and anchoring at the tail section of the anchor cable rod in the later period, after the anchoring is finished, water continuously flows out along the anchor cable hole, the anchor cable hole drain water can influence the anchoring effect of the anchor cable rod, deformation of a foundation pit and surrounding buildings is easily increased, and finally the anchored anchor cable hole is leaked.
Disclosure of Invention
In order to reduce the water leakage probability of an anchored anchor rope hole, the application provides a water blocking and stopping device for a triaxial mixing pile waterproof curtain anchor rope hole.
The application provides a triaxial mixing pile water-stop curtain anchor rope hole leaking stoppage sealing device adopts following technical scheme:
the utility model provides a triaxial mixing pile waterproof curtain anchor rope hole leaking stoppage sealing device, includes setting up in the anchor rope hole and carrying out the grout stopping area of leaking stoppage to the anchor rope hole, setting up on the foundation ditch and with the control assembly of grout stopping area intercommunication, grout stopping area can be according to the content change volume size of inside medium, control assembly is used for leading in or discharging medium in the grout stopping area, control assembly includes:
the medium box is arranged on the foundation pit and is used for providing a medium;
the pipeline is arranged on the medium box and is communicated with the inside of the slurry stopping belt;
and a control valve provided on the pipe and for opening or closing the pipe.
Through adopting above-mentioned technical scheme, will only take the thick liquid to place in the anchor rope hole, then open the control valve, the medium case lets in the medium to only taking through the pipeline for only take the thick liquid volume increase and support tightly on the anchor rope hole inside wall, make only take to seal the anchor rope hole, then pour into the concrete to the anchor rope downthehole, leak stoppage is carried out the anchor rope hole under the effect of liquid pressure, so as to reduce the anchor rope hole probability of leaking of anchorage.
Further, the grouting pipe for grouting the anchor cable hole is arranged in the anchor cable hole, the grouting stopping belt is sleeved on the grouting pipe and the anchor cable rod, the grouting stopping belt is made of flexible materials, and the grouting stopping belt is filled with media so that the volume of the grouting stopping belt is increased, the grouting pipe and the anchor cable rod are wrapped and fixed on the side wall of the anchor cable hole in a butt joint mode.
Through adopting above-mentioned technical scheme, pour into the medium into in the grout stopping area for grout stopping area volume increase under the pressure effect, make grout stopping area fix the anchor rope pole simultaneously and make anchor rope hole be close to rock mass one end and keep sealed relatively, then pour concrete through pouring the pipe towards anchor rope hole be close to rock mass one end, the concrete solidifies under sealed high-pressure environment, so that reduce the anchor rope hole probability of leaking of anchor.
Further, the grout stopping belt is composed of an inner layer and an outer layer, wherein the inner layer is in direct contact with a medium, and the outer layer is sleeved outside the inner layer and is in direct contact with the inner side wall of the anchor rope hole.
Through adopting above-mentioned technical scheme, inlayer and medium direct contact, solid inlayer should have good high pressure explosion-proof and corrosion resistance, and outer and anchor rope hole inside wall direct contact, solid outer should have good wearability and ageing resistance to this improves the intensity of stopping the thick liquid area, is convenient for stop thick liquid area used many times.
Further, a pressure gauge is arranged on the pipeline and close to one side of the slurry stopping belt, and the pressure gauge is used for detecting the pressure value in the slurry stopping belt.
Through adopting above-mentioned technical scheme, let in the medium in the grout stopping area, detect the pressure of grout stopping area inside through the manometer, when grout stopping area internal pressure reaches the setting value, close the booster pump, close the pipeline through the control valve, then detect through observing the manometer with this and whether grout stopping area has revealing, be convenient for guarantee the leakproofness to the anchor rope hole.
Further, be provided with the pressure release subassembly that is used for the pressure release on the grout stopping area, the pressure release subassembly includes:
the pressure relief pipe is arranged on the slurry stopping belt and used for discharging a medium in the slurry stopping belt;
the control switch is arranged on the pressure relief pipe and used for opening or closing the pressure relief pipe;
and the discharge pump is arranged on the pressure relief pipe and is used for discharging the medium in the slurry stopping belt.
Through adopting above-mentioned technical scheme, after the downthehole concrete of anchor rope solidifies and accomplishes, open control switch, start the discharge pump to discharge the medium in the grout stopping area through the pressure release pipe to this reduces the volume of grout stopping area, wait to stop the intraductal medium of grout stopping and discharge the back, be convenient for take out grout stopping area.
Further, the medium tank is composed of a tank body and a booster pump, wherein the tank body is communicated with the pipeline and is used for storing the medium, and the booster pump is arranged on the pipeline and is used for pressurizing the medium in the tank body and then discharging the medium into the slurry stopping belt.
Through adopting above-mentioned technical scheme, when needs are to stopping in the thick liquid area filling medium, carry out the pressure boost processing to the interior exhaust medium of box through the booster pump, be convenient for improve the pressure value that ends thick liquid in the area medium, improve and stop the sealed effect of thick liquid area to the anchor rope hole.
Further, the grout stopping belt is arranged at an anchor rope hole on the cast-in-place pile row, and the grout stopping belt is fixedly supported on the inner side wall of the anchor rope hole of the cast-in-place pile row after the volume of the grout stopping belt is increased.
By adopting the technical scheme, because the intensity of the cast-in-place pile row pile is far greater than the intensity of the clay layer, the probability of collapsing due to pressure of the contact part of the grouting belt and the grouting belt is reduced by propping the grouting belt against the inner side wall of the cast-in-place pile row pile, and meanwhile, the sealing effect of the grouting belt on the anchor cable hole is improved.
Furthermore, before grouting, the grouting pipe is used for injecting a medium into the grouting belt and plugging the anchor cable hole, the grouting belt can be withdrawn from the anchor cable hole for recycling after pressure relief, and the grouting belt can be reused.
By adopting the technical scheme, high-pressure medium is injected into the grout stopping belt when the grout stopping belt is used, so that the grout stopping belt seals the anchor cable hole; after the concrete in the anchor cable hole is solidified, the grout stopping belt is decompressed, so that the grout stopping belt is taken out, the grout stopping belt can be reused, and the construction cost is reduced.
Further, a one-way valve is arranged on the pipeline and is used for discharging the medium from the medium box into the slurry stopping belt.
By adopting the technical scheme, the one-way valve only allows the medium to be discharged into the slurry stopping belt from the medium box, so that the possibility of pressure relief when the slurry stopping belt is used is reduced.
In summary, the present application includes the following beneficial technical effects:
through establishing the grout stop area cover and installing on anchor rope pole and slip casting pipe and placing in the anchor rope hole, open control valve and booster pump, in will the box is discharged into the grout stop area through the pipeline for grout stop area volume increase and parcel live slip casting pipe and anchor rope pole and support tightly on the anchor rope hole inside wall, then the slip casting pipe seals the slip casting to the anchor rope hole, open control switch and discharge pump after the concrete solidification, discharge the medium in the grout stop area, make grout stop area volume reduce, be convenient for take out the grout stop area, thereby reduce the anchor rope hole probability of leaking of anchor.
Drawings
FIG. 1 is a schematic structural view of the present application;
FIG. 2 is a schematic structural view of the present application, mainly showing a slurry stop belt, a control assembly and a pressure relief assembly;
FIG. 3 is a schematic cross-sectional view of A-A of FIG. 1;
fig. 4 is an enlarged schematic view of the portion B in fig. 3.
Reference numerals: 1. a side wall of the foundation pit; 11. stirring piles; 12. arranging cast-in-place piles; 13. anchor cable holes; 14. an anchor cable rod; 15. grouting pipe; 2. a slurry stopping belt; 21. an inner layer; 22. an outer layer; 3. a control assembly; 31. a media box; 311. a case; 312. a booster pump; 32. a pipe; 33. a control valve; 4. a one-way valve; 5. a three-way pipe; 6. a pressure relief assembly; 61. a pressure relief tube; 62. a control switch; 63. a discharge pump; 7. a pressure gauge.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-4.
The embodiment of the application discloses a triaxial mixing pile waterproof curtain anchor rope hole leaking stoppage sealing device.
Referring to fig. 1 and 2, a device for plugging and stopping leakage of an anchor cable hole of a triaxial mixing pile waterproof curtain comprises a grout stopping belt 2 arranged in an anchor cable hole 13 and plugging the anchor cable hole 13, and a control assembly 3 arranged on a foundation pit and communicated with the grout stopping belt 2, wherein the grout stopping belt 2 can change the volume according to the content of internal media, and the control assembly 3 is used for introducing or discharging the media into the grout stopping belt 2.
Referring to fig. 1 and 3, when constructing a foundation pit, three spiral drilling holes of a triaxial stirring pile 11 machine are firstly used for simultaneously constructing downwards, then cement is sprayed into soil body by using the stirring pile 11 machine and is fully stirred, so that a series of physicochemical reactions are generated between the cement and the soil, soft soil is hardened to improve the foundation strength, and a plurality of groups of stirring piles 11 are used for waterproof; then excavating the foundation pit, constructing the cast-in-place pile row pile 12 and constructing the anchor cable rod 14, and firstly drilling anchor cable holes 13 on the side wall 1 of the foundation pit when the anchor cable rod 14 is constructed, and punching the cast-in-place pile row pile 12 and the stirring pile 11 and extending into the rock stratum when the anchor cable holes 13 are constructed.
Referring to fig. 2 and 4, the grout stopping belt 2 is of an oval structure with a hollow interior, the grout stopping belt 2 is made of flexible materials, and the volume of the grout stopping belt 2 can be increased by introducing a medium into the grout stopping belt 2; the grout stopping belt 2 is provided with a mounting hole by taking a long shaft as a circle center, the mounting hole is not communicated with the inside of the grout stopping belt 2, and the anchor cable rod 14 and the grouting pipe 15 penetrate through the mounting hole, so that the grout stopping belt 2 is sleeved on the anchor cable rod 14 and the grouting pipe 15 and placed in the anchor cable hole 13, and the grout stopping belt 2 is fixedly arranged at the cast-in-place pile row 12; the grout stopping belt 2 consists of an inner layer 21 and an outer layer 22, wherein the inner layer 21 is in direct contact with a medium, the inner layer 21 is an elastic fiber layer made of polyurethane material, and the inner layer 21 has good high-pressure explosion resistance and corrosion resistance; the outer layer 22 is sleeved outside the inner layer 21, the outer layer 22 is in direct contact with the inner side wall of the anchor rope hole 13, the anchor rope rod 14 and the grouting pipe 15, the outer layer 22 is formed by weaving deformable polyester yarns, the wear resistance and ageing resistance of the outer layer 22 are good, and the grouting belt 2 is protected from being scratched by the protrusions on the periphery of the anchor rope hole 13 side wall, the anchor rope rod 14 and the grouting pipe 15 in the practical process.
Referring to fig. 2 and 4, the control assembly 3 includes a medium tank 31, a pipe 32 and a control valve 33, the medium tank 31 is disposed on a pit and is used for supplying a medium, the medium tank 31 is composed of a tank 311 and a booster pump 312, the tank 311 is of an internal hollow structure, the tank 311 is fixedly mounted on the pit and is used for storing the medium, the booster pump 312 is fixedly mounted on the tank 311, and the booster pump 312 is communicated with the inside of the tank 311 and is used for boosting the medium discharged from the tank 311; one end of the pipeline 32 is fixedly arranged on the outlet of the booster pump 312, the other end of the pipeline 32 is fixedly arranged on the grout stopping belt 2 and is in spatial communication with the inner layer 21 of the grout stopping belt 2, the pipeline 32 is used for discharging a medium pressurized by the booster pump 312 into the inner layer 21 of the grout stopping belt 2, the one-way valve 4 is fixedly arranged on the inside of the pipeline 32, and the one-way valve 4 is used for discharging the medium into the grout stopping belt 2 from the medium box 31, so that the grout stopping belt 2 deforms, the volume of the grout stopping belt 2 increases, the grouting pipe 15 and the anchor cable rod 14 are wrapped and are fixed on the side wall of the anchor cable hole 13 in a propped mode.
Referring to fig. 2, a control valve 33 is fixedly installed on the pipe 32, the control valve 33 being used to open or close the pipe 32, thereby enabling the control of the size of the pulp stopper belt 2; a three-way pipe 5 is fixedly arranged on a pipeline 32 which is close to one end of the grout stopping belt 2 and is positioned between the control valve 33 and the grout stopping belt 2, and a pressure relief component 6 for relieving pressure in the grout stopping belt 2 is arranged at one end of the three-way pipe 5; the pressure relief assembly 6 comprises a pressure relief pipe 61, a control switch 62 and a pressure discharge pump 63, wherein one end of the pressure relief pipe 61 is fixedly arranged at one end of the three-way pipe 5 and is communicated with the inside of the slurry stopping belt 2, the other end of the pressure relief pipe 61 is fixedly arranged on the upper surface of the box body 311 and is communicated with the inside of the box body 311, and the pressure relief pipe 61 is used for discharging and refluxing the medium in the slurry stopping belt 2 into the box body 311; the control switch 62 is fixedly arranged on the pressure relief pipe 61, and the control switch 62 is used for opening or closing the pressure relief pipe 61; the discharge pump 63 is fixedly arranged on the box body 311 and is communicated with the pressure relief pipe 61, and the discharge pump 63 is used for providing power and discharging all the medium in the slurry stopping belt 2; the medium of this embodiment is hydraulic oil.
Referring to fig. 2 and 4, a pressure gauge 7 is fixedly installed on a pipeline 32 which is close to one end of the grout stop belt 2 and is positioned between the tee pipe 5 and the grout stop belt 2, and the pressure gauge 7 is used for detecting the pressure value in the grout stop belt 2; when in use, the grout stopping belt 2 is sleeved on the anchor cable rod 14 and the grouting pipe 15 and placed in the anchor cable hole 13, and the grout stopping belt 2 is positioned at the anchor cable hole 13 of the cast-in-place pile row pile 12; the pipeline 32 is opened through the control valve 33, the pressure release pipe 61 is closed through the control switch 62, then the booster pump 312 is started to enable the medium in the box 311 to enter the grout stopping belt 2 through the pipeline 32, and meanwhile, the medium is prevented from flowing back through the one-way valve 4, so that the volume of the grout stopping belt 2 is increased, the grouting pipe 15 and the anchor rope rod 14 are wrapped and are abutted and fixed on the side wall of the anchor rope hole 13, meanwhile, the grout stopping belt 2 is abutted against the cast-in-place pile row 12, leakage caused by deformation of the joint of the grout stopping belt 2 and the anchor rope hole 13 is avoided, and the anchor rope hole 13 is plugged.
Referring to fig. 2, the pressure inside the slurry stopping belt 2 is detected by the pressure gauge 7, when the pressure inside the slurry stopping belt 2 reaches a set value, the booster pump 312 is then turned off, the pipe 32 is closed by the control valve 33, and then whether the slurry stopping belt 2 has leakage is detected by observing the pressure gauge 7, specifically, the detection mode is that: observing for at least 30min, and if the number of the pressure gauge 7 is unchanged, recognizing that the slurry belt 2 has no leakage; if the pressure figure becomes smaller, it is considered that leakage occurs in the slurry tape 2, and the slurry tape 2 needs to be replaced in time.
Referring to fig. 2 and 4, after confirming that the grout stop belt 2 is not leaked, pouring concrete grout into the anchor cable hole 13 through the grouting pipe 15, and after the pouring is completed, performing primary solidification of the concrete, and then performing secondary grouting while pulling out the grouting pipe 15, so as to fill the position of the grouting pipe 15; after the concrete in the anchor cable hole 13 is solidified, the pressure relief pipe 61 is opened through the control switch 62, and the pressure discharge pump 63 is opened at the same time, so that the medium in the grout stop belt 2 is discharged and flows back into the box body 311; after the pressure release of the grout stopping belt 2 is completed, the grout stopping belt 2 is extracted from the anchor cable hole 13 and recovered, so that the grout stopping belt 2 can be reused.
The working principle of the embodiment of the application is as follows:
and (3) constructing anchor rope holes 13 on the side wall 1 of the foundation pit, punching through a cast-in-place pile row pile 12 and a stirring pile 11 during construction of the anchor rope holes 13, extending into a rock stratum, sleeving and installing the grout stopping belt 2 on the anchor rope rod 14 and the grouting pipe 15, placing the grout stopping belt in the anchor rope holes 13, opening a control valve 33 and a booster pump 312, discharging a medium in the box 311 into the grout stopping belt 2 through a pipeline 32, increasing the volume of the grout stopping belt 2, wrapping the grouting pipe 15 and the anchor rope rod 14, abutting against the inner side wall of the anchor rope holes 13, sealing and grouting the anchor rope holes 13 by the grouting pipe 15, opening a control switch 62 and a pressure discharging pump 63 after concrete is solidified, discharging the medium in the grout stopping belt 2, reducing the volume of the grout stopping belt 2, and conveniently taking out the grout stopping belt 2 so as to reduce the water leakage probability of the anchored anchor rope holes 13.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (9)

1. The utility model provides a triaxial mixing pile water-stop curtain anchor rope hole leaking stoppage sealing device which characterized in that: including setting up in anchor rope hole (13) and carrying out the grout stopping area (2) of leaking stoppage to anchor rope hole (13), set up on the foundation ditch and with the control assembly (3) of grout stopping area (2) intercommunication, grout stopping area (2) can be according to the content change volume size of inside medium, control assembly (3) are used for letting in or discharge medium in grout stopping area (2), control assembly (3) include:
a medium box (31), wherein the medium box (31) is arranged on the foundation pit and is used for providing a medium;
a pipeline (32), wherein the pipeline (32) is arranged on the medium box (31) and is communicated with the inside of the slurry stopping belt (2);
-a control valve (33), said control valve (33) being arranged on the conduit (32) and being adapted to open or close the conduit (32).
2. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: be provided with in anchor rope hole (13) slip casting pipe (15) to anchor rope hole (13), it installs on slip casting pipe (15) and anchor rope pole (14) to end thick liquid area (2) cover, it makes for flexible soft material to end thick liquid area (2), it makes to end thick liquid area (2) increase in volume and parcel slip casting pipe (15) and anchor rope pole (14) and butt are fixed on anchor rope hole (13) lateral wall to inject the medium in area (2).
3. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: the grout stopping belt (2) consists of an inner layer (21) and an outer layer (22), wherein the inner layer (21) is in direct contact with a medium, and the outer layer (22) is sleeved outside the inner layer (21) and is in direct contact with the inner side wall of the anchor cable hole (13).
4. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 3, wherein: and a pressure gauge (7) is arranged on the pipeline (32) and on one side close to the grout stopping belt (2), and the pressure gauge (7) is used for detecting the pressure value in the grout stopping belt (2).
5. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: be provided with on the grout stop area (2) and be used for pressure release subassembly (6), pressure release subassembly (6) include:
the pressure relief pipe (61) is arranged on the slurry stopping belt (2) and is used for discharging a medium in the slurry stopping belt (2);
a control switch (62), wherein the control switch (62) is arranged on the pressure relief pipe (61) and is used for opening or closing the pressure relief pipe (61);
and a discharge pump (63), wherein the discharge pump (63) is arranged on the pressure relief pipe (61) and is used for discharging the medium in the slurry stopping belt (2).
6. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: the medium box (31) is composed of a box body (311) and a booster pump (312), wherein the box body (311) is communicated with the pipeline (32) and is used for storing a medium, and the booster pump (312) is arranged on the pipeline (32) and is used for pressurizing the medium in the box body (311) and then discharging the medium into the slurry stopping belt (2).
7. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: the grout stopping belt (2) is arranged at an anchor rope hole (13) on the cast-in-place pile row pile (12), and the grout stopping belt (2) is fixedly supported on the inner side wall of the anchor rope hole (13) of the cast-in-place pile row pile (12) after the volume of the grout stopping belt is increased.
8. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 2, wherein: before grouting, the grouting pipe (15) is used for injecting a medium into the grouting belt (2) and plugging the anchor cable hole (13), the grouting belt (2) can be withdrawn from the anchor cable hole (13) for recycling after pressure relief, and the grouting belt (2) can be reused.
9. The triaxial stirring pile waterproof curtain anchor cable hole plugging and water stopping device according to claim 1, wherein the device is characterized in that: the pipeline (32) is provided with a one-way valve (4), and the one-way valve (4) is used for discharging only medium from the medium box (31) into the slurry stopping belt (2).
CN202322483021.0U 2023-09-12 2023-09-12 Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device Active CN220746981U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322483021.0U CN220746981U (en) 2023-09-12 2023-09-12 Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322483021.0U CN220746981U (en) 2023-09-12 2023-09-12 Triaxial stirring stake waterproof curtain anchor rope hole leaking stoppage sealing device

Publications (1)

Publication Number Publication Date
CN220746981U true CN220746981U (en) 2024-04-09

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Application Number Title Priority Date Filing Date
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