CN110424395A - A kind of grouting port for post grouting pile is opened and closed controllable grouting device and method - Google Patents
A kind of grouting port for post grouting pile is opened and closed controllable grouting device and method Download PDFInfo
- Publication number
- CN110424395A CN110424395A CN201910667667.XA CN201910667667A CN110424395A CN 110424395 A CN110424395 A CN 110424395A CN 201910667667 A CN201910667667 A CN 201910667667A CN 110424395 A CN110424395 A CN 110424395A
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- grouting
- coil
- opened
- port
- protective shell
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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
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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
-
- 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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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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)
- Piles And Underground Anchors (AREA)
Abstract
Controllable grouting device and method, including Grouting Pipe, rubber gasket, coil, permanent magnet, protective shell, switch and power supply are opened and closed the invention discloses a kind of grouting port for post grouting pile；Multiple injected holes are offered in Grouting Pipe, protective shell are installed in each injected hole side, protective shell is located inside Grouting Pipe；Coil, permanent magnet are installed in protective shell; the side wall of protective shell is equipped with an opening; the permanent magnet is fixed in protective shell; coil is fixedly connected with rubber gasket; coil is connected by conducting wire with control switch, power supply; glide direction of the rubber gasket on Grouting Pipe axis is controlled whether obtaining electric by control coil, to realize that grouting port is opened and closed controllable purpose.
Description
Technical field
The present invention relates to a kind of devices of the grout injection control in post grouting pile field, in particular to a kind of to lead for grouting behind shaft or drift lining column
The grouting port in domain is opened and closed the application method of controllable grouting device and the device.
Background technique
The drilling of the single technique of cast-in-situ bored pile is easy to cause pile bottom sediment and stake due to the inherent shortcoming of pore-forming technique
The hidden danger such as all mud films.In the preset grouting pipeline in stake bottom or stake side and grouting device when the Post Grouting Technique of drilling is pile, to stake
After body reaches some strength, by grouting pipeline, using high-pressure injection pump pressure injection using cement as the slurries of host agent, to bottom hole sediment
Solidified with stake side mudcake, to eliminate traditional construction technique inherent shortcoming, reaches and improve the bearing capacity of stake, reduce settling amount
Advanced, the scientific technical method of one kind.
Inventor's discovery is distributed uniform, the symmetrical side of design use of grouting port in stake week in order to ensure slip casting rear slurry
Method, because followed when slip casting low-grade slow pressure, it is first dilute after dense principle, after slip casting starts, a certain grouting port under slurries effect first
It opens, remaining grouting port causes cement paste around pile amount to be unevenly distributed, carry to pile because the pressure loss easily occurs being opened and closed different situation
Power has an impact, and the later period because of certain all side low bearing capacity of stake, pile body inclining easily occurs, eventually leads to upper building and generates unevenly
Sedimentation.
Summary of the invention
In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a kind of structures simply, behaviour
Stool control mode victory, economy, convenience and high-efficiency and the device and method that effective can be controlled grouting port and be opened and closed.Grouting port opening and closing is complete
It is controlled by manual operation, can also accomplish unilateral side switching when required, there is very strong practicability.
To achieve the above object, the present invention adopts the following technical solutions:
The first grouting port for being used for post grouting pile field proposed by the present invention is opened and closed controllable grouting device, including slip casting
Pipe, rubber gasket, coil, permanent magnet, protective shell, switch and power supply；
Multiple injected holes are offered in the Grouting Pipe, and protective shell, protective shell position are installed in each injected hole side
Inside Grouting Pipe；Coil, permanent magnet are installed in the protective shell, the side wall of protective shell is equipped with an opening, institute
The permanent magnet stated is fixed in protective shell, and the coil is fixedly connected with rubber gasket, and coil is opened by conducting wire and control
Pass, power supply are connected, and glide direction of the rubber gasket on Grouting Pipe axis are controlled whether obtaining electric by control coil, with reality
Existing grouting port is opened and closed controllable purpose.
As further technical solution, the rubber gasket is to block used in grouting port, is connect with hot-wire coil, thick
Degree must be less than half slip casting bore, and length can cover grouting port.
As further technical solution, it is equipped with preformed hole in the Grouting Pipe, is pierced by for conducting wire.Reserved hole site
It is sealed by sealing ring.
As further technical solution, it is equipped in the other side of the injected hole for rubber seal pad position
The positioning plate positioned.
The second proposed by the present invention grouting port for post grouting pile field is opened and closed controllable device, including Grouting Pipe, rubber
Glue gasket, coil, permanent magnet, protective shell, switch and power supply；
Multiple injected holes are offered in the Grouting Pipe, and protective shell, protective shell position are installed in each injected hole side
Outside Grouting Pipe；Coil, permanent magnet are installed in the protective shell, the side wall of protective shell is equipped with an opening, institute
The permanent magnet stated is fixed in protective shell, and the coil is fixedly connected with rubber gasket, and coil is opened by conducting wire and control
Pass, power supply are connected, and glide direction of the rubber gasket on Grouting Pipe axis are controlled whether obtaining electric by control coil, with reality
Existing grouting port is opened and closed controllable purpose.
As further technical solution, it is equipped in the other side of the injected hole for rubber seal pad position
The positioning plate positioned.
As further technical solution, the rubber gasket is to block used in grouting port, and length can cover note
Starch mouth.
As further technical solution, it is connected by conducting wire with control switch, power supply after multiple coils from parallel connection of coils.
It is opened and closed controllable device based on above two grouting port, the invention also provides a kind of notes for post grouting pile field
Starch the application method of mouth opening and closing controllable device, comprising the following steps:
(1) Grouting Pipe is drilled in predetermined position with appropriate boring head, select to be suitble to the permanent magnet of slip casting bore, coil,
Rubber gasket is fixedly connected coil and rubber seal, it is ensured that its without departing from；
(2) permanent magnet, coil, rubber seal etc. are fixed on preparatory bore position, pass through preformed hole outconnector
Whether the conducting wire of circle is connect with switch, power supply, and can normally slide after testing coil and rubber gasket energization；
(3) after repeating above-mentioned (1), (2) operation to each grouting port of Grouting Pipe, Grouting Pipe is fixed on according to construction requirement
Pile body；
(4) after drawing the conducting wire for connecting coil by preformed hole, prolong pile body and draw upwards, finally connect with switch, power supply
It connects, completes the installment work of grouting port opening and closing controllable device；
(5) after being installed element each in Grouting Pipe, coil and rubber gasket are located at its initial position, and switch is beaten
It opens, grouting port is closed state at this time, and after slip casting work starts, slurries follow " low-grade slow pressure, dense after first dilute " principle and reach
Grouting Pipe, and full of after entire Grouting Pipe, closure switch, at this time because of " anisotropic phase between coil and rubber gasket, with permanent magnet
Inhale " and it is close, and rubber gasket slips away, and grouting port position is open state, and slurries are flowed out from grouting port, and slip casting work starts.
The present invention is not able to satisfy construction requirement according to the actual application, in current conventional grouting port design, not can control
Grouting port opening and closing is also easy to produce on the basis of construction hidden danger, is researched and developed, had the advantage that
(1) package unit structure is simple and convenient to operate, and it is convenient that device material requested obtains, and can be met very well construction and be wanted
It asks；
(2) present apparatus able person is the opening and closing for controlling grouting port, is had for the selection of slip casting side, the control of grouting amount very big
Adaptability, realize directly controlling for slip casting；
(3) all elements of the first scheme of the present apparatus will not be influenced by the external world and be destroyed in Grouting Pipe；
(4) present apparatus is easy to operate, and element uses manpower and material resources sparingly without removing.
(5) after element each in Grouting Pipe is installed by the present apparatus, coil and rubber gasket are located at its initial position, open
It closes and opens, grouting port is closed state at this time, and after slip casting work starts, slurries follow " low-grade slow pressure, dense after first dilute " principle
Reach Grouting Pipe, and full of after entire Grouting Pipe, closure switch, at this time because " different between coil and rubber gasket, with permanent magnet
Property it is attracting " and it is close, rubber gasket slips away, and grouting port position is open state, and slurries are flowed out from grouting port, and slip casting work is opened
Begin；Since all grouting ports are opened simultaneously, so that the grouting amount in stake week is evenly distributed, shadow is not generated to pile bearing capacity
It rings, is less prone to pile body inclining, guarantee that upper building generates uniform settlement.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is that grouting port is opened and closed controllable device (grouting port closing) structural schematic diagram；
Fig. 2 is that grouting port is opened and closed controllable device (grouting port unlatching) structural schematic diagram；
Wherein: 1-Grouting Pipe；2-permanent magnets；3-coils；4-rubber gaskets；5-grouting ports；6-conducting wires；7—
Switch；8-power supplys, 9-protective shells, 10-positioning plates.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination；
In order to facilitate narration, if there is "upper", "lower", " left side " " right side " printed words in the present invention, only expression and attached drawing itself
Upper and lower, left and right direction it is consistent, not to structure rise restriction effect, it is only for convenient for description the present invention and simplification retouch
It states, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, and be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
Term explains part: the terms such as term " installation ", " connected ", " connection ", " fixation " in the present invention should do broad sense
Understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrated；It can be mechanical connection, be also possible to
Electrical connection, can be and be directly connected to, and be also possible to indirectly connected through an intermediary, can be connection inside two elements, or
The interaction relationship of two elements of person, for the ordinary skill in the art, can understand as the case may be on
Term is stated in concrete meaning of the invention.
As background technique is introduced, the deficiencies in the prior art, in order to solve technical problem as above, this Shen
It please propose a kind of grouting port opening and closing controllable device for post grouting pile field；
Embodiment 1
As shown in Figure 1, the grouting port for post grouting pile field is opened and closed controllable device, including Grouting Pipe 1, rubber gasket
4, coil 3, permanent magnet 2, protective shell 9, switch 7 and power supply 8；
Multiple injected holes are offered in Grouting Pipe 1, protective shell 9 are installed in each injected hole side, protective shell 1 is located at note
It starches inside pipe 1；Coil 3, permanent magnet 2 are installed in each protective shell 9, the side wall of protective shell 10 is equipped with one and opens
Mouthful, the permanent magnet 2 is fixed in protective shell, and the coil 3 is fixedly connected with rubber gasket 4, and coil 3 passes through conducting wire
It is connected with control switch 7, power supply 8, cunning of the rubber gasket on Grouting Pipe axis is controlled whether obtaining electric by control coil
Dynamic direction, to realize that grouting port is opened and closed controllable purpose.
As further technical solution, the rubber gasket 4 is to block used in grouting port, is connect with hot-wire coil,
Thickness must be less than half slip casting bore, and length can cover grouting port.
The Grouting Pipe is determined according to needed for building-site, in grouting port side fixed position, using bit bore,
Later period uses bolt fixed permanent magnet herein；The other side installs fixed device additional for preventing rubber gasket sliding using bit bore
It falls.
The coil 3 is connect with rubber gasket 4, after coil 3 is powered, because of electromagnetic induction, permanent magnet and coil and its
The rubber gasket of connection is attracting, and coil and rubber gasket generate sliding, and grouting port is opened.
The permanent magnet 3 is fixed in Grouting Pipe, at a certain distance from grouting port, is used for and hot-wire coil, rubber seal
Pad generates attraction, opens grouting port.The switch and power supply are opened for manual control grouting port.
As further technical solution, it is equipped with preformed hole in the Grouting Pipe 1, is pierced by for conducting wire.Reserved hole location
It sets and is sealed by sealing ring.
As further technical solution, it is equipped in the other side of the injected hole for rubber seal pad position
The positioning plate 10 positioned.
After above-mentioned multiple coils can choose successively parallel connection, it is connected with switch and power supply, after can also being sequentially connected in series
It is connected with switch and power supply, is specifically selected according to the actual situation.
After each element in Grouting Pipe 1 is installed, coil 3 and rubber gasket 4 are located at its initial position, and 7 dozens, switch
It opens, grouting port 5 is closed state at this time, and after slip casting work starts, slurries follow " low-grade slow pressure, dense after first dilute " principle and reach
Grouting Pipe, and full of after entire Grouting Pipe, closure switch 7, at this time because " different between coil 3 and rubber gasket 4, with permanent magnet 2
Property it is attracting " and it is close, rubber gasket 4 slips away, and grouting port 5 are open state, and slurries are flowed out from grouting port, and slip casting work is opened
Begin.
Embodiment 2
The present embodiment also discloses a kind of grouting port for post grouting pile field and is opened and closed controllable device, including Grouting Pipe,
Rubber gasket, coil, permanent magnet, protective shell, switch and power supply；
Multiple injected holes are offered in the Grouting Pipe, and protective shell, protective shell position are installed in each injected hole side
Outside Grouting Pipe；Coil, permanent magnet are installed in the protective shell, the side wall of protective shell is equipped with an opening, institute
The permanent magnet stated is fixed in protective shell, and the coil is fixedly connected with rubber gasket, and coil is opened by conducting wire and control
Pass, power supply are connected, and glide direction of the rubber gasket on Grouting Pipe axis are controlled whether obtaining electric by control coil, with reality
Existing grouting port is opened and closed controllable purpose.It is equipped in the other side of the injected hole for being positioned to rubber seal pad position
Positioning plate.The rubber gasket is to block used in grouting port, and length can cover grouting port.Lead to after multiple coils from parallel connection of coils
Conducting wire is crossed to be connected with control switch, power supply.
The present embodiment is that the position of controllable device installation is different from the distinctive points of embodiment 1, and embodiment 1 is mounted on slip casting
In pipe, the present embodiment is mounted on outside Grouting Pipe.,
Embodiment 3
Present embodiments provide a kind of grouting port opening and closing using post grouting pile field disclosed in embodiment 1 and implementation 2
The method of controllable device progress slip casting, comprising the following steps:
(1) Grouting Pipe is drilled in predetermined position with appropriate boring head, select to be suitble to the permanent magnet of slip casting bore, coil,
Rubber gasket is fixedly connected coil and rubber seal, it is ensured that its without departing from；
(2) permanent magnet, coil, rubber seal etc. are fixed on preparatory bore position, pass through preformed hole outconnector
Whether the conducting wire of circle is connect with switch, power supply, and can normally slide after testing coil and rubber gasket energization；
(3) after repeating above-mentioned (1), (2) operation to each grouting port of Grouting Pipe, Grouting Pipe is fixed on according to construction requirement
Pile body；
(4) after drawing the conducting wire for connecting coil, prolong pile body and draw upwards, finally connect with switch, power supply, complete slip casting
The installment work of mouth opening and closing controllable device；After element each in Grouting Pipe is installed, at the beginning of coil and rubber gasket are located at it
Beginning position, switch are opened, and grouting port is closed state at this time, after slip casting work starts, slurries follow " low-grade slow pressure, it is first dilute
It is dense afterwards " principle reaches Grouting Pipe, and full of after entire Grouting Pipe, closure switch, coil and rubber gasket at this time, with permanent magnet
Between it is close because of " there is a natural attraction between the sexes ", rubber gasket slips away, grouting port position be open state, slurries from grouting port flow out, note
Slurry work starts.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of grouting port for post grouting pile is opened and closed controllable grouting device, which is characterized in that close including Grouting Pipe, rubber
Packing, coil, permanent magnet, protective shell, switch and power supply；
Multiple injected holes are offered in the Grouting Pipe, protective shell are installed in each injected hole side, protective shell is located at note
It starches inside pipe；Coil, permanent magnet are installed in the protective shell, the side wall of protective shell is equipped with an opening, described
Permanent magnet is fixed in protective shell, and the coil is fixedly connected with rubber gasket, and coil passes through conducting wire and control switch, electricity
Source is connected, and glide direction of the rubber gasket on Grouting Pipe axis is controlled whether obtaining electric by control coil, to realize note
It starches mouth and is opened and closed controllable purpose.
2. being opened and closed controllable grouting device for the grouting port of post grouting pile as described in claim 1, which is characterized in that described
Rubber gasket is to block used in grouting port, and thickness is less than half slip casting bore, and length can cover grouting port.
3. being opened and closed controllable grouting device for the grouting port of post grouting pile as described in claim 1, which is characterized in that in institute
The Grouting Pipe stated is equipped with preformed hole, is pierced by for conducting wire.
4. being opened and closed controllable grouting device for the grouting port of post grouting pile as claimed in claim 3, which is characterized in that reserved
Hole site is sealed by sealing ring.
5. being opened and closed controllable grouting device for the grouting port of post grouting pile as described in claim 1, which is characterized in that in institute
The other side for the injected hole stated is equipped with the positioning plate for being positioned to rubber seal pad position.
6. a kind of grouting port for post grouting pile is opened and closed controllable grouting device, which is characterized in that close including Grouting Pipe, rubber
Packing, coil, permanent magnet, protective shell, switch and power supply；
Multiple injected holes are offered in the Grouting Pipe, protective shell are installed in each injected hole side, protective shell is located at note
It starches outside pipe；Coil, permanent magnet are installed in the protective shell, the side wall of protective shell is equipped with an opening, described
Permanent magnet is fixed in protective shell, and the coil is fixedly connected with rubber gasket, and coil passes through conducting wire and control switch, electricity
Source is connected, and glide direction of the rubber gasket on Grouting Pipe axis is controlled whether obtaining electric by control coil, to realize note
It starches mouth and is opened and closed controllable purpose.
7. being opened and closed controllable grouting device for the grouting port of post grouting pile as claimed in claim 6, which is characterized in that in institute
The other side for the injected hole stated is equipped with the positioning plate for being positioned to rubber seal pad position.
8. being opened and closed controllable grouting device for the grouting port of post grouting pile as claimed in claim 6, which is characterized in that described
Rubber gasket is to block used in grouting port, and length can cover grouting port.
9. the grouting port a method as claimed in any one of claims 1-8 for post grouting pile is opened and closed controllable grouting device, feature exists
In being connected with control switch, power supply after multiple coils from parallel connection of coils by conducting wire.
10. it is a kind of using any grouting port for post grouting pile of claim 1-9 be opened and closed controllable grouting device into
The method of row slip casting, which comprises the following steps:
(1) Grouting Pipe is drilled in predetermined position with appropriate boring head, selects the permanent magnet, coil, the rubber that are suitble to slip casting bore
Gasket is fixedly connected coil and rubber seal, it is ensured that its without departing from；
(2) grouting port opening and closing controllable device is fixed on preparatory bore position, is connect by conducting wire with switch, power supply, and test
Whether coil and rubber gasket can normally slide after being powered；
(3) after repeating above-mentioned (1), (2) operation to each grouting port of Grouting Pipe, Grouting Pipe is fixed on stake according to construction requirement
Body；
(4) after drawing the conducting wire for connecting coil, prolong pile body and draw upwards, finally connect with switch, power supply, complete grouting port and open
Close the installment work of controllable device；After element each in Grouting Pipe is installed, coil and rubber gasket are located at its initial bit
It sets, switch is opened, and grouting port is closed state at this time, and after slip casting work starts, slurries follow " low-grade slow pressure, dense after first dilute "
Principle reaches Grouting Pipe, and full of after entire Grouting Pipe, closure switch, at this time between coil and rubber gasket, with permanent magnet
Close because of " there is a natural attraction between the sexes ", rubber gasket slips away, and grouting port position is open state, and slurries are flowed out from grouting port, Cementer
Work starts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910667667.XA CN110424395B (en) | 2019-07-23 | 2019-07-23 | Grouting device and method with opening and closing controllable grouting port for post-grouting pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910667667.XA CN110424395B (en) | 2019-07-23 | 2019-07-23 | Grouting device and method with opening and closing controllable grouting port for post-grouting pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110424395A true CN110424395A (en) | 2019-11-08 |
| CN110424395B CN110424395B (en) | 2021-06-01 |
Family
ID=68411936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910667667.XA Active CN110424395B (en) | 2019-07-23 | 2019-07-23 | Grouting device and method with opening and closing controllable grouting port for post-grouting pile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5697017A (en) * | 1979-12-31 | 1981-08-05 | Kyokado Eng Co Ltd | Method of construction of composite injection and injection pipe used for said method |
| CN2319648Y (en) * | 1998-02-21 | 1999-05-19 | 宗绪尧 | Magnetic holding electromagnetic valve |
| CN208219657U (en) * | 2018-05-21 | 2018-12-11 | 山东威建岩土科技有限公司 | A kind of closed type plug-in type slip casting foundation pile |
-
2019
- 2019-07-23 CN CN201910667667.XA patent/CN110424395B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5697017A (en) * | 1979-12-31 | 1981-08-05 | Kyokado Eng Co Ltd | Method of construction of composite injection and injection pipe used for said method |
| CN2319648Y (en) * | 1998-02-21 | 1999-05-19 | 宗绪尧 | Magnetic holding electromagnetic valve |
| CN208219657U (en) * | 2018-05-21 | 2018-12-11 | 山东威建岩土科技有限公司 | A kind of closed type plug-in type slip casting foundation pile |
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| Publication number | Publication date |
|---|---|
| CN110424395B (en) | 2021-06-01 |
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