CN114482030A - Mechanical tooth rapid pile splicing device and method for PHC tubular pile - Google Patents
Mechanical tooth rapid pile splicing device and method for PHC tubular pile Download PDFInfo
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- CN114482030A CN114482030A CN202111264005.1A CN202111264005A CN114482030A CN 114482030 A CN114482030 A CN 114482030A CN 202111264005 A CN202111264005 A CN 202111264005A CN 114482030 A CN114482030 A CN 114482030A
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- clamping seat
- clamping piece
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003292 glue Substances 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 6
- 210000002435 tendon Anatomy 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
Abstract
The invention provides a mechanical tooth rapid pile splicing device for a PHC tubular pile, which comprises a clamping seat with an open slot, a clamping piece and an end plate matched with the open end of the clamping seat; an end plate is arranged at the opening end of the clamping seat, and a preformed hole is formed in the end plate; the clamping piece is arranged between the two clamping seats, the open ends of the two clamping seats are opposite, and two end parts of the clamping piece are connected with the open slot. The invention also provides a PHC pipe pile splicing method. The pile splicing device provided by the invention consists of the clamping seat, the clamping piece and the end plate, is simple in structure and manufacturing process, can be prefabricated and processed in a factory, and can effectively control the component quality and the cost.
Description
Technical Field
The invention relates to a PHC tubular pile construction technology, in particular to a mechanical tooth rapid pile splicing device and a pile splicing method for a PHC tubular pile.
Background
The PHC tubular pile has the advantages of reliable pile body quality, good bearing performance, high construction speed, low construction cost and the like, and is widely applied to pile foundation engineering. Due to the limitations of prefabrication and transportation of the PHC pile in a factory, a single pile foundation is usually formed by connecting a plurality of sections of PHC piles. Currently, tubular pile connections are mainly by field welding. However, the welding connection process requires high requirements, the labor and material costs are increased year by year, and particularly, the popularization and application of large-diameter PHC pipe piles (such as heel-drilling pipe piles, static-drilling root-planting piles, middle-pounding club-footed piles and the like) have the disadvantages of long welding time of pipe pile connection and great construction efficiency discount.
The mechanical pile splicing is adopted to replace welding pile splicing, and a large number of tests prove that the mechanical pile splicing can meet the design requirements, so that the mechanical pile splicing has a better development prospect. At present, mechanical pile splicing mainly comprises pile splicing methods such as mechanical meshing, bolt connection, flange connection, mortise lock connection, rotary anchoring connection and the like. These pile splicing methods all have the advantage of high pile splicing speed, but also have the problem of high cost and the like.
Disclosure of Invention
The invention aims to provide a mechanical tooth rapid pile splicing device for a PHC tubular pile, which is reliable in pile splicing, simple and convenient in construction and low in manufacturing cost.
The second purpose of the invention is to provide a PHC pipe pile splicing method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mechanical tooth rapid pile splicing device for a PHC tubular pile is characterized by comprising a clamping seat with an open slot, a clamping piece and an end plate matched with the open end of the clamping seat; an end plate is arranged at the opening end of the clamping seat, and a preformed hole is formed in the end plate; the clamping piece is arranged between the two clamping seats, the open ends of the two clamping seats are opposite, and two end parts of the clamping piece are connected with the open slot. The clamping device is characterized in that inner mechanical teeth are arranged in the opening groove of the clamping seat, outer mechanical teeth are arranged outside the two end parts of the clamping piece, and the end parts of the clamping piece are connected with the opening groove through the engagement of the inner mechanical teeth and the outer mechanical teeth. A high-strength quick-gel layer is arranged between the clamping seat and the clamping piece.
Preferably, the groove cavity of the open groove of the clamping seat is cylindrical, elliptical, square or rectangular; the end part of the clamping piece is matched with the groove cavity of the open groove in shape.
Preferably, the clamping piece is provided with a shear section, an occlusion uplift section and a positioning section from the middle part to two ends. And the end part of the clamping piece is provided with an allowable deformation groove which penetrates through the occlusion anti-pulling section and the positioning section.
Preferably, the clamping seat is provided with an anchoring hole matched with the prestressed tendon expansion head.
A PHC pipe pile splicing method comprises the following steps:
the connecting end part of the first section of the precast tubular pile is provided with a first connecting structure, the first connecting structure comprises a first clamping seat which is pre-embedded at the upward connecting end part, and the precast tubular pile is sunk into the hole under the pile sinking process which is synchronously performed by drilling, pile sinking and soil discharging;
after the first section of prefabricated pipe pile is sunk to the position that the top surface of the pile is 30-50 cm away from the ground, injecting high-strength glue into an opening groove of the first clamping seat, and inserting the clamping piece into the first clamping seat to fix the position of the clamping piece;
hoisting a second section of prefabricated pipe pile, arranging a second connecting structure at the connecting end part of the second section of prefabricated pipe pile, wherein the second connecting structure comprises a second clamping seat pre-embedded at the downward connecting end part, vertically aligning with the first section of prefabricated pipe pile through a pile body positioning line, and injecting high-strength glue into a second clamping seat cylinder;
and (5) vertically arranging the second section of the prefabricated pipe pile below the prefabricated pipe pile, and inserting the clamping piece into the second clamping seat to realize quick pile splicing.
The invention has the beneficial effects that:
(1) the pile splicing device comprises the clamping seat, the clamping piece and the end plate, has simple structure and manufacturing process, can be prefabricated and processed in a factory, and has reliable component quality;
(2) the clamping piece is provided with an allowable deformation groove, so that the clamping piece can be engaged with the clamping seat in a pile splicing way by virtue of the dead weight of the tubular pile, and the operation is simple and convenient;
(3) the high-strength quick gel is arranged between the clamping piece and the clamping seat, so that the pile splicing device is effectively prevented from contacting air and water, and the service durability of the component is improved.
(4) The mechanical tooth rapid pile splicing device and method for the PHC tubular pile are reliable in pile splicing, simple and convenient to construct and low in manufacturing cost.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic view of a rapid pile splicing apparatus.
Fig. 2 is a schematic view of a rectangular card.
Fig. 3 is a schematic view of a rectangular cassette.
Fig. 4 is a schematic plan view of the end plate with the rectangular holes, circular holes and elliptical holes reserved.
Fig. 5 is a schematic illustration of the pile splicing method steps.
Wherein:
1-clamping seat, 101-inner mechanical tooth, 102-outer groove cavity, 103-inner mechanical tooth, 104-inner groove cavity, 105-open groove, 106-closed end, 107-prestressed tendon anchoring hole, 108-clamping seat fixing ear, 109-prestressed tendon anchoring reserved channel, 2-clamping piece, 201-outer mechanical tooth, 202-shear segment, 203-pulling resistant segment, 204-positioning segment, 205-allowable deformation groove, 3-upper section tubular pile, 4-lower section tubular pile, 5-end plate, 501-end plate reserved square hole, 502-end plate reserved rectangular hole, 503-end plate reserved circular hole, 504-end plate reserved elliptical hole, 505-end plate prestressed tensioning anchoring hole, 6-annular steel sheath, 7-high-strength fast gel, 8-longitudinal ribs of the tubular pile.
Detailed Description
In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the mechanical tooth rapid pile splicing device for the PHC tubular pile comprises a clamping base 1 provided with inner mechanical teeth, a clamping piece 2 provided with outer mechanical teeth, and an end plate 5 provided with a preformed hole with the same size as the opening end of the clamping base 1.
The clamping seat 1 is provided with an open slot, and the inner mechanical teeth are arranged in a slot cavity of the open slot.
The pile end heads of the upper section of tubular pile 3 and the lower section of tubular pile 4 are both provided with a clamping seat 1, and the opening end 105 of the clamping seat 1 faces outwards. The open end 105 of the card holder 1 is fixed at the reserved hole 501 on the end plate 5 through the fixing lug 108. The closed end 106 of the clamping seat 1 is connected with the tubular pile longitudinal rib 8 in an anchoring way. The clamping piece 2 is arranged between the upper clamping seat 1 and the lower clamping seat 1 and is connected with the outer mechanical tooth 201 of the clamping piece in an one-way meshing manner through the inner mechanical tooth 101 of the clamping seat.
The card 2 is provided with a deformation-allowable groove 205, the notch of the deformation-allowable groove is positioned on the end face of the card 2, and both ends of the card 2 are provided with deformation-allowable grooves 205. Through setting up and allowing deformation groove 205, can take place certain resilience deformation under the mutual extrusion of interior mechanical tooth 101 of cassette 1 and outer mechanical tooth 201 of fastener 2, under the action of the self gravity of last section tubular pile 3 fastener 2 alright insert cassette 1, realize the quick pile extension.
Set up the fast gel layer 7 of high strength between cassette 1 and fastener 2, when promoting tubular pile connection effect, promote pile extension device durability through filling cassette fastener clearance.
The inner cavity of the open slot of the card holder 1 can be cylindrical, elliptic cylindrical, square cylindrical or rectangular cylindrical. The open slot comprises an outer slot cavity 102 and an inner slot cavity, and the diameter of the outer slot cavity is larger than that of the inner slot cavity; the inner machine tooth 101 is disposed in the inner slot cavity. The inner groove cavity is convenient for pile splicing alignment. The end part of the clamping piece 2 is in a shape of a cylinder, an elliptic cylinder, a square cylinder or a rectangular cylinder which is matched with the shape of the groove cavity of the open groove.
The clamping piece 2 is respectively provided with a shear resistant section 202, an occlusion anti-pulling section 203 and a positioning section 204 from the middle part to the two ends, wherein the shear resistant section 202 is an enlarged part and can provide enough shear resistance for the pile connecting part of the pipe pile; the meshing anti-pulling section 203 is provided with unidirectional meshing mechanical teeth 201 which are meshed with the mechanical teeth 101 in the clamping seat in a unidirectional way to play a role in anti-pulling; the positioning section 204 is a mechanical tooth-free section, and the card can be inserted into the card holder 1 without external force to fix the position. The deformation-allowable groove 205 penetrates through the engaging anti-pulling section 203 and the positioning section 204, and allows deformation caused by mutual pressing of mechanical teeth when the card element 2 is inserted into the card holder 1.
The preformed holes of the end plate 5 are the same as the open end 105 of the clamping seat, and can be circular holes 503, elliptical holes 504, square holes 501 and rectangular holes 502, wherein prestressed tension anchoring holes 505 are further arranged beside each preformed hole.
An annular steel sheath 6 is wrapped at the end position of the tubular pile and is connected with the end plate 5 in a welding mode.
The clamping seat 1 is provided with an anchoring hole 107 and a prestressed tendon reserved passage 109 which are matched with the prestressed tendon expansion head 801.
As shown in fig. 2 to 3, the design method of the rectangular clamping seat 1 and the clamping piece 2 in the pile splicing device is as follows:
(1) ensuring that the pile connecting position of the pipe pile has enough shearing resistance, the section size i.j of the shearing resistant section 202 of the clamping piece is satisfied,
(2) ensuring that the pile connecting position of the pipe pile has enough pulling resistance, the section size f.h of the mechanical teeth 201 of the clamping piece is satisfied,
(3) ensuring that the clamping piece 2 can be inserted into the clamping seat 1, allowing the width e of the deformation groove 205 to meet,
(4) ensuring that the clamping piece 2 does not generate plastic deformation, meeting the width requirement of the allowable deformation groove e and the coordinated deformation length d,
(5) ensure that under 3 tubular pile gravity effects of upper segment tubular pile, fastener 2 can insert cassette 1 completely, realize meeting pile extension fast, the ratio of fastener mechanical tooth 201 thickness and length should satisfy
(6) Ensuring that the mechanical teeth 201 of the clamping piece and the mechanical teeth 101 corresponding to the clamping seat can be engaged in a single direction, and the coordinated deformation length d of the clamping piece 2 is also satisfied, wherein d is more than or equal to p + c; correspondingly, one of the card seat1Should satisfy
(7) Ensuring that the clamping piece mechanical tooth 201 and the clamping seat mechanical tooth 101 have enough clamping bearing capacity, the number M of the clamping piece mechanical tooth 201 and the clamping seat mechanical tooth 101 is satisfied,
in the above formula, Fk,FsRespectively are shear force and pulling force load design values, Kk,KsSafety factors of shear and plucking, G, respectivelyPipeIs the weight of the pipe pile EsThe elastic modulus of the clamping piece, N and M are respectively the number of the clamping pieces at the joint of a single tubular pile and the number of the mechanical teeth of the clamping seat, fk,fsRespectively shows the designed values of the shear strength and the tensile strength of the component material, a, b, c, d, e, f, g, h, i, j, k, m, p, l1,l2All indicating a length dimension, and reference is made in particular to fig. 2-3.
As shown in fig. 5, the method for connecting PHC piles according to the present invention includes the following steps:
s1, arranging a first connecting structure at the connecting end part of the first section of the precast tubular pile, wherein the first connecting structure comprises a first clamping seat pre-embedded at the upward connecting end part, and sinking the precast tubular pile into a hole under a pile sinking process synchronously performing drilling, pile sinking and soil discharging;
s2, when the first section of prefabricated pipe pile sinks to the top surface of the pile and leaves the ground, injecting high-strength glue into an opening groove of the first clamping seat, and inserting the clamping piece into the first clamping seat to fix the position of the clamping piece;
s3, hoisting a second section of prefabricated pipe pile, arranging a second connecting structure at the downward connecting end part of the second section of prefabricated pipe pile, wherein the second connecting structure comprises a second clamping seat pre-embedded at the downward connecting end part, vertically aligning the second clamping seat with the first section of prefabricated pipe pile through a pile body positioning line, and injecting high-strength glue into a second clamping seat cylinder;
s4, vertically lowering the second section of the prefabricated tubular pile, and inserting the clamping piece into the second clamping seat to realize rapid pile extension.
The pile splicing method for the whole pile comprises the following steps: the PHC tubular pile comprises a plurality of first sections of prefabricated tubular piles and second sections of prefabricated tubular piles; hoisting a first section of prefabricated tubular pile and a second section of prefabricated tubular pile, vertically stacking and connecting, and connecting the whole PHC tubular piles; the first section of precast tubular pile and the second section of precast tubular pile are connected through a first connecting structure, a second connecting structure and a clamping piece.
The concrete connecting mode of the whole pile is as follows:
a1, arranging a first connecting structure at the connecting end part of the first section of the precast tubular pile, hoisting the first section of the precast tubular pile, and sinking the precast tubular pile into the hole under the pile sinking process that the drilling, pile sinking and soil discharging are synchronous;
a2, when the first section of prefabricated pipe pile sinks to the position where the top surface of the pile is 40cm away from the ground, injecting high-strength glue into an opening groove of the first clamping seat, and inserting the clamping piece into the first clamping seat to fix the position of the clamping piece;
a3, hoisting a second section of precast tubular pile, arranging a second connecting structure at the downward connecting end part of the second section of precast tubular pile, vertically aligning the second section of precast tubular pile with the first section of precast tubular pile through a pile body positioning line, and injecting high-strength glue into a second clamping seat barrel;
a4, vertically lowering a second section of the prefabricated pipe pile, and inserting the clamping piece into a second clamping seat;
a5, arranging a first connecting structure at the upward connecting end part of the second section of the prefabricated pipe pile, injecting high-strength glue into an opening groove of a first clamping seat, and inserting a clamping piece into the first clamping seat to fix the position of the clamping piece;
a6, hoisting another first section of prefabricated pipe pile, arranging a second connecting structure at the downward connecting end part of the first section of prefabricated pipe pile, vertically aligning the first section of prefabricated pipe pile with a second section of prefabricated pipe pile through a pile body positioning line, and injecting high-strength glue into a second clamping seat cylinder; and vertically putting the second section of the prefabricated pipe pile down, so that the clamping piece is inserted into the second clamping seat.
A7, and analogy is like A5 and A6, vertically stacking a first prefabricated pipe pile section and a second prefabricated pipe pile section, arranging a first connecting structure at the upward connecting end, arranging a second connecting structure at the downward connecting end, and connecting the first connecting structure and the second connecting structure through a clamping piece.
The pile splicing method for the whole pile comprises the following steps: the PHC tubular pile comprises a plurality of first sections of prefabricated tubular piles and second sections of prefabricated tubular piles; hoisting a first section of prefabricated tubular pile and a second section of prefabricated tubular pile, vertically stacking and connecting, and connecting the whole PHC tubular piles; the first section of precast tubular pile and the second section of precast tubular pile are connected through a first connecting structure, a second connecting structure and a clamping piece.
The above description is only an example of the present invention, and is not intended to limit the present invention in any way, and modifications and equivalents made according to the technical spirit of the present invention are included in the technical scope of the present invention.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship merely for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention.
In the description herein, references to the terms "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (5)
1. A mechanical tooth rapid pile splicing device for a PHC tubular pile is characterized by comprising a clamping seat with an open slot, a clamping piece and an end plate matched with the open end of the clamping seat; an end plate is arranged at the opening end of the clamping seat, and a preformed hole is formed in the end plate; the clamping piece is arranged between the two clamping seats, the open ends of the two clamping seats are opposite, and two end parts of the clamping piece are connected with the open slot. The clamping device is characterized in that inner mechanical teeth are arranged in the opening groove of the clamping seat, outer mechanical teeth are arranged outside the two end parts of the clamping piece, and the end parts of the clamping piece are connected with the opening groove through the engagement of the inner mechanical teeth and the outer mechanical teeth. A high-strength quick-gel layer is arranged between the clamping seat and the clamping piece.
2. The mechanical tooth rapid pile extension device for PHC tubular piles according to claim 1, characterized in that: the groove cavity of the open groove of the clamping seat is cylindrical, elliptic, square or rectangular; the end part of the clamping piece is matched with the groove cavity of the open groove in shape.
3. The mechanical tooth rapid pile extension device for PHC tubular pile according to claim 1, wherein the clamping piece is respectively a shear-resistant section, an occlusion pulling-resistant section and a positioning section from the middle part to the two ends. And the end part of the clamping piece is provided with an allowable deformation groove which penetrates through the occlusion anti-pulling section and the positioning section.
4. The mechanical tooth rapid pile extension device for PHC tubular pile according to claim 1, wherein the clamping seat is provided with an anchoring hole matched with the prestressed tendon enlarged head.
5. A PHC pipe pile splicing method comprises the following steps:
the connecting end part of the first section of the precast tubular pile is provided with a first connecting structure, the first connecting structure comprises a first clamping seat which is pre-embedded at the upward connecting end part, and the precast tubular pile is sunk into the hole under the pile sinking process which is synchronously performed by drilling, pile sinking and soil discharging;
after the first section of prefabricated pipe pile is sunk to the position that the top surface of the pile is 30-50 cm away from the ground, injecting high-strength glue into an opening groove of the first clamping seat, and inserting the clamping piece into the first clamping seat to fix the position of the clamping piece;
hoisting a second section of prefabricated tubular pile, arranging a second connecting structure at the connecting end part of the second section of prefabricated tubular pile, wherein the second connecting structure comprises a second clamping seat pre-embedded at the downward connecting end part, vertically aligning with the first section of prefabricated tubular pile through a pile body positioning line, and injecting high-strength glue into a second clamping seat cylinder;
and (5) vertically arranging the second section of the prefabricated pipe pile below the prefabricated pipe pile, and inserting the clamping piece into the second clamping seat to realize quick pile splicing.
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| CN202111264005.1A CN114482030B (en) | 2021-10-28 | 2021-10-28 | Mechanical tooth rapid pile extension device and pile extension method for PHC pipe pile |
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| CN202111264005.1A CN114482030B (en) | 2021-10-28 | 2021-10-28 | Mechanical tooth rapid pile extension device and pile extension method for PHC pipe pile |
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| CN114482030B CN114482030B (en) | 2024-04-12 |
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| CN102966099A (en) * | 2012-10-29 | 2013-03-13 | 浙江海天建设集团有限公司 | Construction method for quick joint of prestressed concrete tubular pile and special bending test device |
| CN103161159A (en) * | 2013-03-27 | 2013-06-19 | 周兆弟 | Prestressed concrete pipe pile butt joint construction member and prestressed concrete pipe pile |
| KR101644449B1 (en) * | 2015-12-18 | 2016-08-12 | (주)현타 | Phc pile using joint plate and connecting fin |
| CN106088083A (en) * | 2016-08-18 | 2016-11-09 | 泉州建华建材有限公司 | A kind of expansion biting connecions mechanical connecting joint |
| CN206034422U (en) * | 2016-08-29 | 2017-03-22 | 许伟敏 | PHC tubular pile does not have welding ready -packaged joint |
| WO2018041023A1 (en) * | 2016-08-29 | 2018-03-08 | 许伟敏 | Non-welded quick-fit joint of phc pipe pile |
| CN106812137A (en) * | 2017-03-06 | 2017-06-09 | 广州市第三建筑工程有限公司 | A kind of quick pile extension device, prefabricated pile and preparation method thereof and pile extension method |
| CN109208583A (en) * | 2018-09-27 | 2019-01-15 | 陈溯源 | A kind of precast pipe pile splicing multi-section reinforced joint structure |
| CN213805347U (en) * | 2020-09-08 | 2021-07-27 | 天津宝丰建材有限公司 | Elastic clamping type mechanical quick connector for concrete pile |
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