CN209482338U - A kind of plug-in type prefabricated pile basis - Google Patents

A kind of plug-in type prefabricated pile basis Download PDF

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Publication number
CN209482338U
CN209482338U CN201822255919.1U CN201822255919U CN209482338U CN 209482338 U CN209482338 U CN 209482338U CN 201822255919 U CN201822255919 U CN 201822255919U CN 209482338 U CN209482338 U CN 209482338U
Authority
CN
China
Prior art keywords
prefabricated pile
plug
limit mechanism
type
limit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201822255919.1U
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Chinese (zh)
Inventor
王茂成
杨忠波
刘赛男
孙月焕
龙锦壮
张坤
陈高波
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.)
Changdao Sunshine Garden Greening Co Ltd
State Grid Corp of China SGCC
Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
Changdao Sunshine Garden Greening Co Ltd
State Grid Corp of China SGCC
Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changdao Sunshine Garden Greening Co Ltd, State Grid Corp of China SGCC, Yantai Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical Changdao Sunshine Garden Greening Co Ltd
Priority to CN201822255919.1U priority Critical patent/CN209482338U/en
Application granted granted Critical
Publication of CN209482338U publication Critical patent/CN209482338U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of plug-in type prefabricated pile basis, including plug-in type prefabricated pile installation foundation mechanism, concrete is squeegeeed fixing layer, prefabricated pile position-limit mechanism, four-way prefabricated pile position-limit mechanism and four-way prefabricated pile limit instruction frame, the utility model is by the way that plug-in type column prefabricated pile to be inserted into prefabricated pile position-limit mechanism, prefabricated pile metal spacing plate right above prefabricated pile position-limit mechanism can be bent, and enter in prefabricated pile position-limit mechanism with plug-in type column prefabricated pile close to prefabricated pile position-limit mechanism side wall, it is fully inserted at the L-type check annular groove that prefabricated pile metal spacing plate end after prefabricated pile position-limit mechanism can be connected in plug-in type column prefabricated pile bottom in plug-in type column prefabricated pile and plug-in type column prefabricated pile is inhibited to deviate from prefabricated pile position-limit mechanism, coagulation between prefabricated pile position-limit mechanism and plug-in type column prefabricated pile again Soil is squeegeeed placing concrete at fixing layer, completes the installation of prefabricated pile plug-in type, simple to operate, structural stability is strong.

Description

A kind of plug-in type prefabricated pile basis
Technical field:
The utility model belongs to prefabricated pile basis technical field, in particular to a kind of plug-in type prefabricated pile basis.
Background technique:
Traditional plug-in type prefabricated pile basis structure is single, is easy to happen loosening after prefabricated pile insertion, needs a large amount of works It is supported operation as personnel, delays the working time, affects working efficiency, while being also easy to cause danger.
Summary of the invention:
The purpose of this utility model is that solve the above-mentioned problems and provides a kind of plug-in type prefabricated pile basis, solves Disadvantage of the existing technology.
To solve the above-mentioned problems, the utility model provides a kind of plug-in type prefabricated pile basis technical solution:
A kind of plug-in type prefabricated pile basis, including plug-in type prefabricated pile installation foundation mechanism, concrete are squeegeeed fixing layer, pre- Stake position-limit mechanism, four-way prefabricated pile position-limit mechanism and four-way prefabricated pile limit instruction frame processed, the plug-in type prefabricated pile peace Dress fundamental mechanism is installed on inside plug-in type prefabricated pile mounting surface, is equipped on the inside of the plug-in type prefabricated pile installation foundation mechanism pre- Stake position-limit mechanism processed, the cross section of the prefabricated pile position-limit mechanism are diamond structure, are set right above the prefabricated pile position-limit mechanism There is plug-in type column prefabricated pile, the plug-in type column prefabricated pile bottom outside is equipped with several layers L-type check annular groove, described in every layer The cross section of L-type check annular groove is " L " shape, and the plug-in type column prefabricated pile least significant end is equipped with pile top, the pile top top Connect with taper pile crown, the tapered pile overhead is connect with plug-in type column prefabricated pile, the plug-in type column prefabricated pile and It is connected between pile top by taper pile crown, between prefabricated pile position-limit mechanism bottom and inner wall and plug-in type column prefabricated pile It squeegees fixing layer equipped with concrete.
Preferably, the prefabricated pile position-limit mechanism top outer is located at plug-in type prefabricated pile mounting surface upper surface equipped with four Instruction frame is limited to prefabricated pile, is equipped with four-way prefabricated pile position-limit mechanism, institute on the inside of the four-way prefabricated pile limit instruction frame State four-way prefabricated pile position-limit mechanism be located at four-way prefabricated pile limit instruction frame four right-angle side positions be equipped with one it is unidirectional Prefabricated pile position-limit mechanism is equipped with prefabricated pile metal spacing plate, the prefabricated pile on each unidirectional prefabricated pile position-limit mechanism Metal spacing plate one end is fixed on unidirectional prefabricated pile position-limit mechanism, and the prefabricated pile metal spacing plate other end extends to prefabricated The surface of stake position-limit mechanism.
Preferably, the terminal position of the prefabricated pile metal spacing plate is half arc, and each prefabricated pile is golden Belonging to limit plate is that stainless steel material is made, and each prefabricated pile metal spacing plate passes through the fixed spiral shell of two metal spacing plates Bolt is fixed on unidirectional prefabricated pile position-limit mechanism, is located between the metal spacing plate fixing bolt and prefabricated pile metal spacing plate Metal annular gasket is arranged on the outside of metal spacing plate fixing bolt, the metal annular gasket is made of annular steel material, described The junction of metal spacing plate fixing bolt and prefabricated pile metal spacing plate is equipped with limit plate mounting hole.
Preferably, the metal spacing plate fixing bolt passes through the limit plate mounting hole peace on prefabricated pile metal spacing plate Loaded in screw thread mounting groove.
Preferably, each metal spacing plate fixing bolt is all-metal hex bolts, the four-way prefabricated pile It is unilateral each of on the outside of limit instruction frame to be all provided with there are three strengthening of foundation reinforcing bar.
Preferably, being equipped with reinforcement patches fixed plate, the reinforcing in each planar inner wall of prefabricated pile position-limit mechanism Friction reinforcement patches are equipped at prefabricated pile position-limit mechanism on the outside of pad fixed plate.
Preferably, the friction reinforcement patches are made of surface with the anti-slip rubber material of irregular grain.
Preferably, solid by several fixed plate fixing bolts between the reinforcement patches fixed plate and prefabricated pile position-limit mechanism Fixed connection.
The utility model has the beneficial effects that
The utility model is located at prefabricated pile position restrainer by the way that plug-in type column prefabricated pile to be inserted into prefabricated pile position-limit mechanism Prefabricated pile metal spacing plate right above structure can be bent, and entered in prefabricated pile position-limit mechanism with plug-in type column prefabricated pile and leaned on Nearly prefabricated pile position-limit mechanism side wall, the prefabricated pile metal spacing after plug-in type column prefabricated pile is fully inserted into prefabricated pile position-limit mechanism Plate end can be connected at the L-type check annular groove of plug-in type column prefabricated pile bottom and inhibit the abjection of plug-in type column prefabricated pile pre- Stake position-limit mechanism processed, finally the concrete between prefabricated pile position-limit mechanism and plug-in type column prefabricated pile is squeegeeed and is poured at fixing layer Concrete is filled, the installation of prefabricated pile plug-in type is completed, it is simple to operate, and structural stability is strong,
Detailed description of the invention:
The present invention is described in detail by the following detailed description and drawings for ease of explanation,.
Fig. 1 is the structural schematic diagram of the utility model;
Fig. 2 is the prefabricated pile position-limit mechanism side view of the utility model;
Fig. 3 is the four-way prefabricated pile position-limit mechanism top view of the utility model;
Fig. 4 is the prefabricated pile structural schematic diagram of the utility model;
Fig. 5 is the four-way prefabricated pile position-limit mechanism structural schematic diagram of the utility model.
In figure: 1, plug-in type prefabricated pile installation foundation mechanism;2, concrete is squeegeeed fixing layer;3, prefabricated pile position-limit mechanism; 4, plug-in type prefabricated pile mounting surface;5, four-way prefabricated pile position-limit mechanism;6, plug-in type column prefabricated pile;7, four-way prefabricated pile limits Indicate frame;8, unidirectional prefabricated pile position-limit mechanism;9, prefabricated pile metal spacing plate;10, strengthening of foundation reinforcing bar;11, L-type check ring Slot;12, taper pile crown;13, pile top;14, metal spacing plate fixing bolt;15, reinforcement patches fixed plate;16, rub reinforcement patches; 17, fixed plate fixing bolt;18, metal annular gasket;19, limit plate mounting hole;20, screw thread mounting groove.
Specific embodiment:
As shown in Figs. 1-5, present embodiment uses a kind of following technical scheme: plug-in type prefabricated pile basis, described Including plug-in type prefabricated pile installation foundation mechanism 1, concrete squeegee fixing layer 2, prefabricated pile position-limit mechanism 3, four-way prefabricated pile limit Position mechanism 5 and four-way prefabricated pile limit instruction frame 7, the plug-in type prefabricated pile installation foundation mechanism 1 are installed on plug-in type Inside prefabricated pile mounting surface 4, prefabricated pile position-limit mechanism 3 is equipped on the inside of the plug-in type prefabricated pile installation foundation mechanism 1, it is described pre- The cross section of stake position-limit mechanism 3 processed is diamond structure, is equipped with plug-in type column prefabricated pile right above the prefabricated pile position-limit mechanism 3 6,6 bottom outside of plug-in type column prefabricated pile is equipped with several layers L-type check annular groove 11, every layer of L-type check annular groove 11 Cross section be " L " shape, 6 least significant end of plug-in type column prefabricated pile is equipped with pile top 13,13 top of the pile top and taper Pile crown 12 connects, and 12 top of taper pile crown is connect with plug-in type column prefabricated pile 6,6 He of plug-in type column prefabricated pile It is prefabricated by the connection of taper pile crown 12,3 bottom of prefabricated pile position-limit mechanism and inner wall and plug-in type column between pile top 13 Concrete is equipped between stake 6 to squeegee fixing layer 2.
Wherein, 3 top outer of prefabricated pile position-limit mechanism is located at 4 upper surface of plug-in type prefabricated pile mounting surface equipped with four-way Prefabricated pile limit instruction frame 7, the four-way prefabricated pile limit indicate to be equipped with four-way prefabricated pile position-limit mechanism 5, institute on the inside of frame 7 State four-way prefabricated pile position-limit mechanism 5 be located at four-way prefabricated pile limit instruction frame 7 four right-angle side positions be equipped with a list To prefabricated pile position-limit mechanism 8, it is equipped with prefabricated pile metal spacing plate 9 on each unidirectional prefabricated pile position-limit mechanism 8, it is described pre- 9 one end of stake metal spacing plate processed is fixed on unidirectional prefabricated pile position-limit mechanism 8, and 9 other end of prefabricated pile metal spacing plate prolongs Extend to the surface of prefabricated pile position-limit mechanism 3.
Wherein, the terminal position of the prefabricated pile metal spacing plate 9 is half arc, described and each prefabricated pile metal limit Position plate 9 is that stainless steel material is made, and each prefabricated pile metal spacing plate 9 passes through two metal spacing plate fixing bolts 14 are fixed on unidirectional prefabricated pile position-limit mechanism 8, between the metal spacing plate fixing bolt 14 and prefabricated pile metal spacing plate 9 Metal annular gasket 18 is arranged on the outside of metal spacing plate fixing bolt 14, the metal annular gasket 18 is annular steel material It is made, the junction of the metal spacing plate fixing bolt 14 and prefabricated pile metal spacing plate 9 is equipped with limit plate mounting hole 19.
Wherein, the metal spacing plate fixing bolt 14 passes through the limit plate mounting hole 19 on prefabricated pile metal spacing plate 9 It is installed in screw thread mounting groove 20, it is described to facilitate fixed prefabricated pile metal spacing plate 9.
Wherein, each metal spacing plate fixing bolt 14 is all-metal hex bolts, the four-way prefabricated pile limit Each of position instruction frame 7 outside is unilateral to be all provided with that there are three strengthening of foundation reinforcing bars 10, described to step up the utility model structure more It gathers.
Wherein, reinforcement patches fixed plate 15, the reinforcement patches are equipped in each planar inner wall of the prefabricated pile position-limit mechanism 3 15 outside of fixed plate is equipped with friction reinforcement patches 16 at prefabricated pile position-limit mechanism 3, and the raising frictional force is described to prevent from inserting Enter after formula column prefabricated pile 6 is installed and loosens.
Wherein, the friction reinforcement patches 16 are made of surface with the anti-slip rubber material of irregular grain.
Wherein, pass through several fixed plate fixing bolts 17 between the reinforcement patches fixed plate 15 and prefabricated pile position-limit mechanism 3 It is fixedly connected, the stability improved between reinforcement patches fixed plate 15 and prefabricated pile position-limit mechanism 3.
It is specific: a kind of plug-in type prefabricated pile basis, in use, plug-in type column prefabricated pile 6 is inserted into prefabricated pile first In position-limit mechanism 3, the prefabricated pile metal spacing plate 9 right above prefabricated pile position-limit mechanism 3 can be bent, and with plug-in type column Shape prefabricated pile 6 enters close to 3 side wall of prefabricated pile position-limit mechanism in prefabricated pile position-limit mechanism 3, complete in plug-in type column prefabricated pile 6 9 end of prefabricated pile metal spacing plate can be connected in the L-type of 6 bottom of plug-in type column prefabricated pile after insertion prefabricated pile position-limit mechanism 3 At check annular groove 11 and plug-in type column prefabricated pile 6 is inhibited to deviate from prefabricated pile position-limit mechanism 3, finally in prefabricated pile position-limit mechanism 3 Concrete between plug-in type column prefabricated pile 6 is squeegeeed placing concrete at fixing layer 2, and the installation of prefabricated pile plug-in type is completed, It is simple to operate, and structural stability is strong, wherein 3 top outer of prefabricated pile position-limit mechanism is located at the installation of plug-in type prefabricated pile 4 upper surface of face is equipped with four-way prefabricated pile limit instruction frame 7, and it is prefabricated to be equipped with four-way on the inside of four-way prefabricated pile limit instruction frame 7 Stake position-limit mechanism 5, four right-angle side positions that four-way prefabricated pile position-limit mechanism 5 is located at four-way prefabricated pile limit instruction frame 7 are equal Equipped with a unidirectional prefabricated pile position-limit mechanism 8, it is equipped with prefabricated pile metal spacing plate 9 on each unidirectional prefabricated pile position-limit mechanism 8, 9 one end of prefabricated pile metal spacing plate is fixed on unidirectional prefabricated pile position-limit mechanism 8, and 9 other end of prefabricated pile metal spacing plate extends To the surface of prefabricated pile position-limit mechanism 3;The terminal position of prefabricated pile metal spacing plate 9 is half arc, and each prefabricated pile Metal spacing plate 9 is that stainless steel material is made, and each prefabricated pile metal spacing plate 9 passes through the fixed spiral shell of two metal spacing plates Bolt 14 is fixed on unidirectional prefabricated pile position-limit mechanism 8, the meta position of metal spacing plate fixing bolt 14 and prefabricated pile metal spacing plate 9 Metal annular gasket 18 is arranged on the outside of metal spacing plate fixing bolt 14, metal annular gasket 18 is made of annular steel material, The junction of metal spacing plate fixing bolt 14 and prefabricated pile metal spacing plate 9 is equipped with limit plate mounting hole 19;Metal spacing plate The limit plate mounting hole 19 that fixing bolt 14 passes through on prefabricated pile metal spacing plate 9 is installed in screw thread mounting groove 20, convenient solid Determine prefabricated pile metal spacing plate 9;Each metal spacing plate fixing bolt 14 is all-metal hex bolts, the limit of four-way prefabricated pile Each of instruction frame 7 outside is unilateral to be all provided with that there are three strengthening of foundation reinforcing bars 10, keeps the utility model structure more compact;It is prefabricated Reinforcement patches fixed plate 15 is equipped in the stake each planar inner wall of position-limit mechanism 3,15 outside of reinforcement patches fixed plate is limited close to prefabricated pile It is equipped with friction reinforcement patches 16 at the mechanism 3 of position, improves frictional force, is loosened after preventing plug-in type column prefabricated pile 6 from installing;Friction adds Gu pad 16 is made of surface with the anti-slip rubber material of irregular grain;Reinforcement patches fixed plate 15 and prefabricated pile position-limit mechanism 3 Between be fixedly connected by several fixed plate fixing bolts 17, improve between reinforcement patches fixed plate 15 and prefabricated pile position-limit mechanism 3 Stability, the utility model by by plug-in type column prefabricated pile 6 be inserted into prefabricated pile position-limit mechanism 3 in, be located at prefabricated pile limit Prefabricated pile metal spacing plate 9 right above position mechanism 3 can be bent, and entered prefabricated pile with plug-in type column prefabricated pile 6 and limited It is pre- after plug-in type column prefabricated pile 6 is fully inserted into prefabricated pile position-limit mechanism 3 close to 3 side wall of prefabricated pile position-limit mechanism in mechanism 3 9 end of stake metal spacing plate processed can be connected at the L-type check annular groove 11 of 6 bottom of plug-in type column prefabricated pile and inhibit plug-in type Column prefabricated pile 6 deviates from prefabricated pile position-limit mechanism 3, finally between prefabricated pile position-limit mechanism 3 and plug-in type column prefabricated pile 6 Concrete is squeegeeed placing concrete at fixing layer 2, and the installation of prefabricated pile plug-in type is completed, simple to operate, and structural stability By force.
The basic principles and main features of the present invention and the advantages of the present invention, current row has been shown and described above The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention, the utility model Claimed range is defined by the appending claims and its equivalent thereof.

Claims (8)

1. a kind of plug-in type prefabricated pile basis, including plug-in type prefabricated pile installation foundation mechanism (1), concrete are squeegeeed fixing layer (2), prefabricated pile position-limit mechanism (3), four-way prefabricated pile position-limit mechanism (5) and four-way prefabricated pile limit instruction frame (7), it is special Sign is: the plug-in type prefabricated pile installation foundation mechanism (1) is installed on plug-in type prefabricated pile mounting surface (4) inside, described to insert Enter and is equipped with prefabricated pile position-limit mechanism (3) on the inside of formula prefabricated pile installation foundation mechanism (1), the cross of the prefabricated pile position-limit mechanism (3) Section is diamond structure, and plug-in type column prefabricated pile (6), the plug-in type are equipped with right above the prefabricated pile position-limit mechanism (3) Column prefabricated pile (6) bottom outside is equipped with several layers L-type check annular groove (11), every layer of L-type check annular groove (11) it is transversal Face is " L " shape, and plug-in type column prefabricated pile (6) least significant end is equipped with pile top (13), pile top (13) top and taper Pile crown (12) connection, taper pile crown (12) top are connect with plug-in type column prefabricated pile (6), and the plug-in type column is prefabricated Pass through taper pile crown (12) connection, prefabricated pile position-limit mechanism (3) bottom and inner wall between stake (6) and pile top (13) and inserts Enter to be equipped with concrete between formula column prefabricated pile (6) and squeegees fixing layer (2).
2. a kind of plug-in type prefabricated pile basis according to claim 1, it is characterised in that: the prefabricated pile position-limit mechanism (3) top outer be located at plug-in type prefabricated pile mounting surface (4) upper surface equipped with four-way prefabricated pile limit instruction frame (7), it is described Four-way prefabricated pile position-limit mechanism (5), the four-way prefabricated pile position-limit mechanism are equipped on the inside of four-way prefabricated pile limit instruction frame (7) (5) four right-angle side positions for being located at four-way prefabricated pile limit instruction frame (7) are equipped with a unidirectional prefabricated pile position-limit mechanism (8), prefabricated pile metal spacing plate (9), the prefabricated pile metal limit are equipped on each unidirectional prefabricated pile position-limit mechanism (8) Position plate (9) one end is fixed on unidirectional prefabricated pile position-limit mechanism (8), and prefabricated pile metal spacing plate (9) other end extends to The surface of prefabricated pile position-limit mechanism (3).
3. a kind of plug-in type prefabricated pile basis according to claim 2, it is characterised in that: the prefabricated pile metal spacing plate (9) terminal position is half arc, and each prefabricated pile metal spacing plate (9) is that stainless steel material is made, each The prefabricated pile metal spacing plate (9) is fixed on unidirectional prefabricated pile position restrainer by two metal spacing plate fixing bolts (14) It is located at metal spacing plate on structure (8), between the metal spacing plate fixing bolt (14) and prefabricated pile metal spacing plate (9) to fix It is arranged metal annular gasket (18) on the outside of bolt (14), the metal annular gasket (18) is made of annular steel material, the gold The junction for belonging to limit plate fixing bolt (14) and prefabricated pile metal spacing plate (9) is equipped with limit plate mounting hole (19).
4. a kind of plug-in type prefabricated pile basis according to claim 3, it is characterised in that: the fixed spiral shell of the metal spacing plate The limit plate mounting hole (19) that bolt (14) passes through on prefabricated pile metal spacing plate (9) is installed in screw thread mounting groove (20).
5. a kind of plug-in type prefabricated pile basis according to claim 3, it is characterised in that: each metal spacing plate is solid Determining bolt (14) is all-metal hex bolts, unilateral each of on the outside of four-way prefabricated pile limit instruction frame (7) to be all provided with There are three strengthening of foundation reinforcing bar (10).
6. a kind of plug-in type prefabricated pile basis according to claim 1, it is characterised in that: the prefabricated pile position-limit mechanism (3) it is equipped in each planar inner wall reinforcement patches fixed plate (15), is limited on the outside of the reinforcement patches fixed plate (15) close to prefabricated pile Friction reinforcement patches (16) is equipped at position mechanism (3).
7. a kind of plug-in type prefabricated pile basis according to claim 6, it is characterised in that: the friction reinforcement patches (16) are Surface is made with the anti-slip rubber material of irregular grain.
8. a kind of plug-in type prefabricated pile basis according to claim 6, it is characterised in that: the reinforcement patches fixed plate (15) It is fixedly connected between prefabricated pile position-limit mechanism (3) by several fixed plate fixing bolts (17).
CN201822255919.1U 2018-12-29 2018-12-29 A kind of plug-in type prefabricated pile basis Expired - Fee Related CN209482338U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201822255919.1U CN209482338U (en) 2018-12-29 2018-12-29 A kind of plug-in type prefabricated pile basis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201822255919.1U CN209482338U (en) 2018-12-29 2018-12-29 A kind of plug-in type prefabricated pile basis

Publications (1)

Publication Number Publication Date
CN209482338U true CN209482338U (en) 2019-10-11

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Application Number Title Priority Date Filing Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109629589A (en) * 2018-12-29 2019-04-16 国网山东省电力公司烟台供电公司 A kind of plug-in type prefabricated pile basis
CN111910624A (en) * 2020-07-08 2020-11-10 龙世金 Inserted automatic locking prestressed concrete pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109629589A (en) * 2018-12-29 2019-04-16 国网山东省电力公司烟台供电公司 A kind of plug-in type prefabricated pile basis
CN109629589B (en) * 2018-12-29 2024-01-16 国网山东省电力公司烟台供电公司 Inserted prefabricated pile foundation
CN111910624A (en) * 2020-07-08 2020-11-10 龙世金 Inserted automatic locking prestressed concrete pile

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Granted publication date: 20191011

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