CN110241808A - A kind of internal connecting type grouting stop grouting plug device and grouting method - Google Patents
A kind of internal connecting type grouting stop grouting plug device and grouting method Download PDFInfo
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- CN110241808A CN110241808A CN201910467158.2A CN201910467158A CN110241808A CN 110241808 A CN110241808 A CN 110241808A CN 201910467158 A CN201910467158 A CN 201910467158A CN 110241808 A CN110241808 A CN 110241808A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of internal connecting type grouting stop grouting plug device and grouting methods, comprising: only starches bolt, for the cavity structure comprising slurry entry and slurry output end and both ends perforation, cavity inside is used for transmission slurries；For being set in injected hole, slurry entry is located at outside injected hole, and slurry output end is located in injected hole；Cap is only starched, is a thin column, diameter is greater than the internal diameter of slurry output end, is installed on the slurry output end for only starching bolt, opens in slip casting, be closed at the end of slip casting；Attachment device is detachably connected with a wall surface of only slurry cap, and is located in the only cavity of slurry bolt；Triangle bearing rod is axially set in the cavity for only starching bolt, is connected with attachment device, under pressure is used in slurry pressure or injected hole in the only cavity of slurry bolt, matches with attachment device, drives and only starches that cap is corresponding to be opened or close.It can effectively be starched auto-stopping using the device.
Description
Technical field
The invention belongs to pre-pouring grout Construction Technology fields, and in particular to a kind of internal connecting type grouting stop grouting plug device and
Grouting method.
Background technique
Pre-pouring grout engineering construction field institute mostly uses internal connecting type stop grouting plug only to be starched using stop grouting plug device, and tradition is only starched
Plug device requires strictly grouting serous fluid because of stop grouting plug diameter deficiency, and stops and be unable to auto-stopping slurry when starching, and method mostly uses valve
Gunnysack plug is stifled after door holder slurry or disassembly, easily generation grouting serous fluid intensity deficiency, insufficient pressure or leakiness, sealing apparent mass
The relevant issues such as difference, circulation time length；As what the fast development of engineering construction process and construction quality required further increases,
To backfill grouting quality, there has also been Compulsory Features for pre-pouring grout engineering construction, and traditional stop grouting plug is caused not to be able to satisfy under existing environment
Pre-pouring grout demand.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of internal connecting type slip casting
With stop grouting plug device and grouting method, can effectively starch auto-stopping.
In order to solve the above technical problems, the technical solution adopted by the present invention is that, a kind of internal connecting type grouting stop grouting plug device,
It include: only to starch bolt, for the cavity structure comprising slurry entry and slurry output end and both ends perforation, cavity inside is used for transmission slurries；
For being set in injected hole, slurry entry is located at outside injected hole, and slurry output end is located in injected hole；Cap is only starched, is a thin column,
Diameter is greater than the internal diameter of slurry output end, is installed on the slurry output end for only starching bolt, opens in slip casting, be closed at the end of slip casting；Connection
Device is detachably connected with a wall surface of only slurry cap, and is located in the only cavity of slurry bolt；Triangle bearing rod, is axially set in
In the cavity for only starching bolt, it is connected with attachment device, pressure is made in slurry pressure or injected hole in the only cavity of slurry bolt
It under, is matched with attachment device, drives only that cap is corresponding opens or close for slurry.
Further, the slurry output end lateral wall radial outward dilations of bolt should only be starched.
Further, which includes the hollow column that a both ends communicate, and is coaxially fixed on and only starches in bolt.
Further, which includes: a connecting rod, and vertical removable is connected at the center for only starching cap；It is arranged
In on column；Connecting rod can slide back and forth in column, and with drive, only slurry cap is moved forward and backward, and realize and only starch cap and slurry output end
Between folding.
One nut, the end screwed connection with connecting rod；Have a diameter larger than the diameter of column；It is remote for limiting connecting rod
With a distance from the movement of slurry entry.
One spring, is set in connecting rod, and between nut and column, and the diameter of spring is less than the diameter of nut；
For driving the only close pulp end motion of slurry cap direction.
Further, around the one-week interval arrangement of hollow column, there are three fixed links, and the end of fixed link is connected to only
On the inner wall for starching bolt.
Further, further include rubber washer, for the hollow column that both ends communicate, be sheathed on and only starch outside bolt, one end
Close to the slurry output end for only starching bolt, the other end is located at the only position slightly above injected hole of slurry bolt.
The slurry output end inner sidewall for being located at only slurry bolt of rubber washer is radially expanded, expansion radian and only slurry bolt
Slurry output end it is consistent, for only slurry bolt slurry output end side wall fit.
Further, further include the steel plate washer and nut to match, be respectively positioned on outside injected hole；Steel plate washer is a torus,
It is set in outside the rubber washer only starched on bolt, and close to slurry entry.Nut is that both ends communicate and one end has circumferential wall surface
Shell is arranged outside the rubber washer for being installed on and only starching on bolt, after fastening, makes the lateral wall at rubber washer radial outward dilations
Face is closely affixed on the side wall of injected hole.
Further, external screw thread is provided on the side wall for the slurry entry that should only starch bolt.
It further, further include multiple gas vents, longitudinally through be provided with of each gas vent is only starched in bolt wall, multiple exhausts
Hole is intervally arranged.
The invention also discloses a kind of grouting methods, use a kind of above-mentioned internal connecting type grouting stop grouting plug device, the party
Method is as follows:
Step 1: injected hole is arranged in setting position, by the coaxial arrangement of stop grouting plug device in injected hole；
Step 2: external Grouting Pipe is connect with only slurry bolt thread；
Step 3: slip casting: towards only slurry bolt reperfusion serosity, slurries act on only to be starched on cap Grouting Pipe, only starches cap direction
Direction far from slurry output end moves, and connecting rod is driven to move in column towards same direction；When nut move to it is close
When only starching cap, and spring is in most compressed state, and pulp at this time is open maximum；
Slip casting terminates, and Grouting Pipe stops slip casting, and the pressure that the slurries in injected hole generate, which acts on, only starches on cap, in spring
The elastic force effect towards slurry entry under, drive connecting rod to move in column towards slurry entry, drive only slurry cap towards leaning on
Nearly pulp end motion realizes the closure only starched between cap and slurry output end until fitting in slurry output end；
Step 4: removing Grouting Pipe and stop grouting plug device.
A kind of internal connecting type grouting stop grouting plug device of the present invention and grouting method have the advantages that 1. is full when grouting pressure
Sufficient demand is only starched using only slurry cap automatic rebounding, and having the advantages that being capable of fast short stopping slurry under the premise of guaranteeing grouting quality.2.
Only hollow in the slurry body of bolt, under the premise of meeting tube wall tearing strength greater than grouting pressure, internal diameter can increase as far as possible, effectively
Reduce restriction of the caliber to grouting serous fluid, is suitable for a variety of grouting serous fluids.3. general Grouting Pipe passes through pipe female connector and only slurry spiral shell
It tethers and connects, quick release reduces the cycle operation time.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of internal connecting type grouting stop grouting plug device in the present invention；
Fig. 2 is the top view of internal connecting type grouting stop grouting plug device in the present invention；
Fig. 3 is the structural schematic diagram of attachment device in the present invention；
Fig. 4 is the equipped figure of attachment device and triangle bearing rod；
Wherein: 1. only starch bolt；2. triangle bearing rod；2-1. column；2-2. fixed link；3. only slurry cap；4. wedge-shaped rubber
Rubber gasket；5. steel plate washer；6. nut；7. Grouting Pipe；8. pipe female connector；9. spring；10. ring-shaped rubber washer；11. gas vent；12.
Geological stratification；13-1. connecting rod；13-2. nut.
Specific embodiment
A kind of internal connecting type grouting stop grouting plug device of the present invention, as shown in Figure 1, comprising: starch bolt 1, only for comprising into slurry
The cavity structure that end and slurry output end and both ends penetrate through, cavity inside are used for transmission slurries；For being set in injected hole, into slurry
End is located at outside injected hole, and slurry output end is located in injected hole；The internal diameter for only starching bolt 1 is consistent, only starches the slurry output end lateral wall of bolt 1
Radial outward dilations.Under the premise of only slurry bolt 1 meets tube wall tearing strength greater than grouting pressure, internal diameter can increase as far as possible.
It only starches and is provided with external screw thread on the side wall of the slurry entry of bolt 1.
Cap 3 is only starched, is a thin column, diameter is greater than the internal diameter of slurry output end, and fitting is installed on the pulp for only starching bolt 1
End, opens in slip casting, is closed at the end of slip casting.Attachment device is detachably connected with a wall surface of only slurry cap 3, and is located at only
In the cavity for starching bolt 1.
Attachment device is detachably connected with a wall surface of only slurry cap 3, and is located in the only cavity of slurry bolt 1.
Triangle bearing rod 2 is axially fixed in the only cavity of slurry bolt 1, is connected with attachment device, in only slurry bolt
Pressure is used down in slurry pressure or injected hole in 1 cavity, is matched with attachment device, drive only slurry cap 3 it is corresponding open or
It closes.
As shown in Fig. 2, triangle bearing rod 2 includes the hollow column 2-1 that a both ends communicate, coaxially it is fixed on and only starches bolt
In 1.And the transmission of slurries not to be influenced, around hollow columnar convenient for triangle bearing rod 2 to be fixed on the inner wall for only starching bolt 1
There are three fixed link 2-2, the end of fixed link is connected on the inner wall for only starching bolt 1 for the one-week interval arrangement of body 2-1.Fixed link
2-2 can be fixedly connected with the inner wall of only slurry bolt 1, can also be detachably connected.
As shown in figure 3, attachment device includes: a connecting rod 13-1, vertical removable is connected at the center for only starching cap 3；
It is sheathed in column 2-1；Connecting rod 13-1 can slide back and forth in column 2-1, and with drive, only slurry cap 3 is moved forward and backward, real
The now only folding between slurry cap 3 and slurry output end.Front and back in the application is proximate to before injected hole opening is, opens far from injected hole
After being at mouthful.
One nut 13-2, the end screwed connection with connecting rod 13-1；Have a diameter larger than the diameter of column 2-1；For
The distance that limitation connecting rod 13-1 is moved far from slurry entry；The outer diameter of above-mentioned nut 13-2 is greater than the diameter of spring 9, to guarantee bullet
Spring 8 will not be skidded off by nut 13-2.
One spring 9, is set on connecting rod 13-1, and between nut 13-2 and column 2-1, the diameter of spring 9 is small
In the diameter of nut 13-2；Cap 3 is only starched towards close to pulp end motion for driving.Triangle bearing rod 2 is matched with attachment device
Dress figure is as shown in Figure 4.
Above-mentioned stop grouting plug device further includes rubber washer 4, for the hollow column that both ends communicate, is sheathed on only slurry bolt 1
Outside, close to the slurry output end for only starching bolt 1, the other end is located at the only position slightly above injected hole of slurry bolt 1 for one end；
The radially outer expansion of the slurry output end inner sidewall for being located at only slurry bolt 1 of rubber washer 4, expansion radian and only slurry bolt
1 slurry output end is consistent, for fitting with the slurry output end side wall of only slurry bolt 1.Ring is arranged in the slurry output end of only slurry bolt 1
Shape rubber washer 10, to realize and only starch fitting closely for cap 3.
Further include the steel plate washer 5 and nut 6 to match, is respectively positioned on outside injected hole；Steel plate washer 5 is a torus, is set in
It only starches outside the rubber washer 4 on bolt 1, and close to slurry entry；Nut 6 communicates for both ends and one end has the shell of circumferential direction wall surface
Body is arranged outside the rubber washer 4 for being installed on and only starching on bolt 1, after fastening, makes the outside at 4 radial outward dilations of rubber washer
Wall surface is closely affixed on the side wall of injected hole.
In fastening, steel plate washer 5 and the inner wall of nut 6 are fitted closely, and for fastening rubber washer 4, and drive only slurry spiral shell
The lateral wall radial outward dilations of the grout outlet of bolt 1, the outer side surface for squeezing rubber washer 4 are closely affixed on the side wall of injected hole
On.It is closely connected to achieve the effect that the stop grouting plug device is fastened with slip casting hole.
Above-mentioned stop grouting plug device further includes multiple gas vents 11, and each gas vent 11 is longitudinally through to be provided with only slurry bolt 1
In wall, multiple gas vents 11 are intervally arranged.And and external communication, exhaust bore dia be not easy it is excessive prevent slurries be lost or slip casting drop
Pressure, quantity can be determined according to slip casting pore size and grouting serous fluid consistency.
Stop grouting plug device can make Multiple Type since internal diameter does not limit and avoid blocking according to slip casting hole size,
Therefore a variety of grouting serous fluids are applicable in.According to the difference of use environment, that is, geological stratification 12, two classes can be divided into, first kind use environment is
Soft broken geological stratification, the second class use environment are that surface is the intensive geological stratification of hard or wall for grouting, and wall compression strength is greater than
Grouting pressure punches slip casting on the intensive geological stratification of hard or wall for grouting, the two the difference is that, the first kind use ring
In border, need to be coaxially disposed grouting pipe in injected hole.
The method for carrying out slip casting using a kind of above-mentioned internal connecting type grouting stop grouting plug device is as follows:
Step 1: choosing whether to be arranged according to locating environment using drilling machine arrangement injected hole in place as required
Grouting pipe, then by the coaxial arrangement of stop grouting plug device in injected hole；
Step 2: external Grouting Pipe 7 is threadedly coupled with only slurry bolt 1.
Step 3: slip casting: towards only slurry 1 reperfusion serosity of bolt, slurries act on only to be starched on cap 3 Grouting Pipe 7, only starches cap 3
It is directed away from the direction movement of slurry output end, and connecting rod 13-1 is driven to move in column 2-1 towards same direction；Work as nut
When 13-2 is moved to close to only slurry cap 3, and spring 9 is in most compressed state, and pulp at this time is open maximum；
Slip casting terminates, and Grouting Pipe 7 stops slip casting, and the pressure that the slurries in injected hole generate, which acts on, only starches on cap 3, in bullet
Under the elastic force effect towards slurry entry of spring 9, connecting rod 13-1 is driven to move in column 2-1 towards slurry entry, drive stops
Cap 3 is starched towards close to pulp end motion, until fitting in slurry output end, realizes the closure only starched between cap 3 and slurry output end.
It is to provide slurries by external slip casting machine when slip casting, is to be threadedly coupled pipe female connector 8 with only slurry bolt 1 first,
Then general Grouting Pipe 7 is connected with pipe female connector 8, and pressure gauge is installed in Grouting Pipe 7.After grouting serous fluid pours into slip casting machine
Slip casting is carried out, observes pressure gauge and periphery situation during slip casting in real time, slurry is lost in discovery periphery gap or pressure is unsatisfactory for slip casting
Stop slip casting when demand.
Step 4: removing Grouting Pipe 7.It after slip casting machine stops slip casting, beats pressure relief valve and is depressurized, release pipe after the completion and connect
Set 8 is connect with only slurry bolt 1, is cleaned using mixing water to slip casting machine, general Grouting Pipe 7, pipe female connector 8 and the periphery position Yi Jiang
Completely, after grouting serous fluid intensity reaches 2.5Mpa, only slurry bolt 1 leakage screw thread is cut off completely using cutting machine, and uses
Sander polishes flat, and construction terminates.
Claims (10)
1. a kind of internal connecting type grouting stop grouting plug device characterized by comprising
Bolt (1) only is starched, for the cavity structure comprising slurry entry and slurry output end and both ends perforation, cavity inside is used for transmission slurry
Liquid；For being coaxially disposed in injected hole, slurry entry is located at outside injected hole, and slurry output end is located in injected hole；
Cap (3) only are starched, are a thin column, diameter is greater than the internal diameter of slurry output end, and fitting is installed on going out for only slurry bolt (1)
End is starched, opens in slip casting, is closed at the end of slip casting；
Attachment device is detachably connected with a wall surface of only slurry cap (3), and is located in the only cavity of slurry bolt (1)；
Triangle bearing rod (2), axial restraint are set in the only cavity of slurry bolt (1), are connected with the attachment device,
It under pressure is used in slurry pressure or injected hole in the only cavity of slurry bolt (1), is matched with attachment device, drive institute
Stating only slurry, cap (3) are corresponding opens or close.
2. a kind of internal connecting type grouting stop grouting plug device according to claim 1, which is characterized in that the only slurry bolt
(1) the lateral wall radial outward dilations of slurry output end.
3. a kind of internal connecting type grouting stop grouting plug device according to claim 1 or 2, which is characterized in that the tripod
Stud (2) includes the hollow column (2-1) that a both ends communicate, and is coaxially fixed in only slurry bolt (1).
4. a kind of internal connecting type grouting stop grouting plug device according to claim 3, which is characterized in that the attachment device packet
It includes:
One connecting rod (13-1), vertical removable are connected at the only center of slurry cap (3)；It is sheathed on the column (2-
1) on；The connecting rod (13-1) can slide back and forth in the column (2-1), to drive fortune before and after only slurry cap (3)
It is dynamic, realize the only folding between slurry cap (3) and slurry output end；
One nut (13-2), the end screwed connection with the connecting rod (13-1)；Have a diameter larger than the column (2-1)
Diameter；The distance for being directed away from slurry entry movement for limiting the connecting rod (13-1)；
One spring (9) is set on the connecting rod (13-1), and between the nut (13-2) and column (2-1), institute
The diameter for stating spring (9) is less than the diameter of nut (13-2)；For driving only slurry cap (3) towards close to pulp end motion.
5. a kind of internal connecting type grouting stop grouting plug device according to claim 3 or 4, which is characterized in that around described hollow
There are three fixed link (2-2), the end of the fixed link is connected to the only slurry bolt for the one-week interval arrangement of column (2-1)
(1) on inner wall.
6. a kind of internal connecting type grouting stop grouting plug device according to claim 5, which is characterized in that further include rubber washer
(4), the hollow column communicated for both ends is sheathed on only slurry bolt (1) outside, and one end is close to only slurry bolt (1)
Slurry output end, the other end are located at the only position slightly above injected hole of slurry bolt (1)；
The inner sidewall for being located at the only slurry output end of slurry bolt (1) of the rubber washer (4) is radially expanded, and arc is expanded
Degree is consistent with the only slurry slurry output end of bolt (1), for fitting with the slurry output end side wall of only slurry bolt (1).
7. a kind of internal connecting type grouting stop grouting plug device according to claim 6, which is characterized in that further include matching
Steel plate washer (5) and nut (6), are respectively positioned on outside injected hole；
The steel plate washer (5) is a torus, is set in the rubber washer (4) only starched on bolt (1) outside, and close to described
Slurry entry；
The nut (6) communicates for both ends and one end has the shell of circumferential direction wall surface, is arranged described in being installed on and only starches bolt (1)
On rubber washer (4) outside, after fastening, the outer side surface at the rubber washer (4) radial outward dilations is made closely to be affixed on note
On the side wall for starching hole.
8. a kind of internal connecting type grouting stop grouting plug device according to claim 1 or 2, which is characterized in that the only slurry spiral shell
External screw thread is provided on the side wall of the slurry entry of bolt (1).
9. a kind of internal connecting type grouting stop grouting plug device according to claim 8, which is characterized in that further include multiple exhausts
Hole (11), each gas vent (11) is longitudinally through to be provided in described only slurry bolt (1) wall, between multiple gas vents (11)
Every arrangement.
10. a kind of grouting method, which is characterized in that use a kind of internal connecting type grouting of any of claims 1-9
Stop grouting plug device, this method are as follows:
Step 1: injected hole is arranged in setting position, by stop grouting plug device coaxial arrangement in injected hole；
Step 2: external Grouting Pipe (7) is threadedly coupled with only slurry bolt (1)；
Step 3: slip casting: for the Grouting Pipe (7) towards only slurry bolt (1) reperfusion serosity, slurries act on only slurry cap (3)
On, only slurry cap (3) is directed away from the direction movement of slurry output end, and drives the connecting rod (13-1) in the column
It is moved in (2-1) towards same direction；When the nut (13-2) is moved to close to only slurry cap (3), and the spring
(9) it is in most compressed state, pulp at this time is open maximum；
Slip casting terminates, and the Grouting Pipe (7) stops slip casting, and the pressure that the slurries in the injected hole generate acts on the only slurry
On cap (3), under the elastic force effect towards slurry entry of the spring (9), drive the connecting rod (13-1) in the column
It is moved in body (2-1) towards slurry entry, drive slurry cap (3) that stops is towards close pulp end motion, until going out described in fitting in
End is starched, the closure only starched between cap (3) and slurry output end is realized；
Step 4: removing Grouting Pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467158.2A CN110241808A (en) | 2019-05-31 | 2019-05-31 | A kind of internal connecting type grouting stop grouting plug device and grouting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467158.2A CN110241808A (en) | 2019-05-31 | 2019-05-31 | A kind of internal connecting type grouting stop grouting plug device and grouting method |
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| Publication Number | Publication Date |
|---|---|
| CN110241808A true CN110241808A (en) | 2019-09-17 |
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ID=67885597
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|---|---|---|---|
| CN201910467158.2A Pending CN110241808A (en) | 2019-05-31 | 2019-05-31 | A kind of internal connecting type grouting stop grouting plug device and grouting method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07158388A (en) * | 1993-12-06 | 1995-06-20 | Musashino Kiko Kk | Check valve |
| JPH0931954A (en) * | 1995-07-21 | 1997-02-04 | Kopurosu:Kk | Corrugated pipe for shaft |
| RU2273698C1 (en) * | 2004-07-21 | 2006-04-10 | Читинский государственный университет (ЧитГУ) | Percussion drilling assembly |
| JP2012021395A (en) * | 2011-08-29 | 2012-02-02 | Metro Kaihatsu Kk | Water cut-off structure of backfill material filling hole and refilling method of backfill material |
| CN204961934U (en) * | 2015-09-29 | 2016-01-13 | 温岭市铭煜建筑机械厂 | Pile foundation slip casting check valve |
| CN206636537U (en) * | 2017-03-30 | 2017-11-14 | 朱玉洪 | Well head backward flowing preventing device |
-
2019
- 2019-05-31 CN CN201910467158.2A patent/CN110241808A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07158388A (en) * | 1993-12-06 | 1995-06-20 | Musashino Kiko Kk | Check valve |
| JPH0931954A (en) * | 1995-07-21 | 1997-02-04 | Kopurosu:Kk | Corrugated pipe for shaft |
| RU2273698C1 (en) * | 2004-07-21 | 2006-04-10 | Читинский государственный университет (ЧитГУ) | Percussion drilling assembly |
| JP2012021395A (en) * | 2011-08-29 | 2012-02-02 | Metro Kaihatsu Kk | Water cut-off structure of backfill material filling hole and refilling method of backfill material |
| CN204961934U (en) * | 2015-09-29 | 2016-01-13 | 温岭市铭煜建筑机械厂 | Pile foundation slip casting check valve |
| CN206636537U (en) * | 2017-03-30 | 2017-11-14 | 朱玉洪 | Well head backward flowing preventing device |
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