CN115928721A - Friction type double-thread connecting assembly and assembly type building - Google Patents
Friction type double-thread connecting assembly and assembly type building Download PDFInfo
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- CN115928721A CN115928721A CN202310233887.8A CN202310233887A CN115928721A CN 115928721 A CN115928721 A CN 115928721A CN 202310233887 A CN202310233887 A CN 202310233887A CN 115928721 A CN115928721 A CN 115928721A
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Abstract
The invention discloses a friction type double-thread connecting assembly and an assembly type building, relates to the field of precast concrete pile connecting members, aims to solve the problems of tension and insufficient ductility of the existing connecting structure, and adopts the technical scheme that: install middle nut and combination nut in the sleeve, middle nut fixes the inner wall at sleeve opening part, middle nut inner wall is round platform form setting and narrower one end is located the opening part, the combination nut outer wall is contradicted at the inner wall of middle nut and can take place relative slip, combination nut is provided with at least two and evenly distributed at the internal surface of middle nut, it is gapped between the adjacent combination nut, combination nut's inner wall have the screw thread and with the external screw thread adaptation of screw thread friction lever, be provided with the elastic component in the sleeve and be used for the combination nut of contradicting. The scheme of the invention can form larger occluding force, improve the connection strength and the tensile force, and can be damaged in a ductile way under the condition of displacement, thereby ensuring the building safety and meeting the requirements of building engineering assembly.
Description
Technical Field
The invention relates to a precast concrete pile connecting component, in particular to a friction type double-thread connecting component and an assembly type building.
Background
The fabricated building is formed by the steps of producing and processing part of precast concrete components in a workshop, transporting the precast concrete components to a construction site and assembling the precast concrete components on the site. The types of the ground assembly prefabricated parts mainly include: external wall panels, internal wall panels, laminated slabs, balconies, air-conditioning panels, stairs, prefabricated beams, prefabricated columns, prefabricated shear walls and the like; underground assembly part: and (5) prefabricating the concrete pile. A large amount of assembly operations on site reduce the environmental pollution such as sewage, dust, photochemistry and the like on site of a construction site, the labor intensity is greatly reduced compared with the original cast-in-place operation, and the construction method meets the requirement of green buildings. The prefabricated columns and the prefabricated shear walls are connected with each other up and down in the prefabricated building, and the adopted connecting components are important parts of the prefabricated columns and the prefabricated shear walls; the connection member is not only considering the stability of the connection but also considering its tensile property. After the precast concrete member connects, the connecting piece group on the member forms the closed dead lock state, under seismic energy and wind load effect, probably produces great perpendicular pulling force component, and the connecting elements of this moment play more important interlock, makes to avoid taking place the separation or postpone to take place the separation as far as possible between the building body component, guarantees personnel's time of fleing.
In the prior art, the structural components shown in fig. 1 are mostly used for connection, and mainly include a high-strength connecting rod 1, a protruding step 2 is provided at the end of the connecting rod 1, and is installed in a first building component, a sleeve 3 is usually preset in a second building component connected with the first building component, and a limit stop piece 4 is arranged in the sleeve 3; when the first building component is connected with the second building component, the connecting rod 1 extends into the sleeve 3 and breaks through the limiting blocking piece 4, and the end part of the limiting blocking piece 4 is abutted against the end face of the step 2 of the connecting rod 1 to form abutting joint, so that the connecting and tensile resisting effects are achieved; however, such a design has some problems: when a large vertical pulling force component is generated under the action of earthquake force and wind load, and the component breaks through the maximum resisting pulling force of the connecting component, brittle fracture occurs, and the first building component and the second building component can be directly separated, so that danger is caused.
Therefore, a new solution is needed to solve this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a friction type double-thread connecting component which can improve the pulling resistance of the connection, can provide a ductile failure state and avoid brittle fracture.
The technical purpose of the invention is realized by the following technical scheme: a friction type double-thread connecting component is characterized in that: the thread friction rod is arranged in the sleeve, and the thread friction rod is arranged in the sleeve; install middle nut and combination nut in the sleeve, the inner wall at the sleeve opening part is fixed to middle nut, middle nut inner wall is that the round platform form sets up and narrower one end is located the opening part, the combination nut outer wall is contradicted at the inner wall of middle nut and can take place relative slip, combination nut is provided with at least two and evenly distributed at the internal surface of middle nut, has the clearance between the adjacent combination nut, combination nut's inner wall have the screw thread and with the external screw thread looks adaptation of screw thread friction pole, be provided with the elastic component in the sleeve and be used for conflicting combination nut.
The invention is further configured to: and a reduction tray is additionally arranged between the combined nut and the elastic piece.
The invention is further configured to: the reduction tray is arranged in a circular ring shape, one side surface of the reduction tray is in contact with the end surfaces of the middle nut and the combined nut, the other side surface of the reduction tray is in direct contact with the elastic piece, and the central part of the reduction tray is used for the threaded friction rod to penetrate through.
The invention is further configured to: the middle nut is provided with a step at the narrower end thereof for abutting against the end face of the sleeve.
The invention is further configured to: the inner wall of the middle nut is provided with three parts, namely a first bending part positioned at the narrower end, a second bending part positioned at the middle part and a third bending part positioned at the wider end; the first bending part bends towards the hollow part of the middle nut, and the third bending part bends towards the solid part of the middle nut; the outer wall of the combined nut is matched with the inner wall of the middle nut.
The invention is further configured to: and an elastic hoop ring is hooped on the outer ring of the combined nut.
The invention is further configured to: an annular groove is formed in the outer ring of the combined nut and used for limiting displacement of the elastic hoop.
The invention is further configured to: and the inner wall of the combined nut is provided with a reinforcing rib used for extending into the annular groove to abut against the elastic hoop.
The invention is further configured to: and a locking structure is also arranged between the reduction tray and the thread friction rod.
The invention is further configured to: the reduction tray is provided with a telescopic resistance rod, the thread friction rod is provided with a resistance hole, and the resistance rod can extend into the resistance hole to form a locking structure.
The invention is further configured to: the reduction tray is provided with a mounting hole, the resistance rod is mounted in the mounting hole and can stretch out of the mounting hole to enter the resistance hole, the end face of the middle nut is provided with a thimble, and the thimble is used for extruding the resistance rod to stretch out of the mounting hole.
The invention is further configured to: and a spring is also arranged in the mounting hole and used for connecting the resistance rod to enable the resistance rod to contract in the mounting hole.
The invention is further configured to: thimble and resistance bar all are provided with the inclined plane that agrees with each other, when reduction tray is contradicted with middle nut and is connected, the inclined plane of resistance bar is contradicted to the inclined plane of thimble makes the resistance bar stretch out the mounting hole.
The invention is further configured to: the middle nut is connected with the sleeve through threads.
The invention is further configured to: and a reinforcing part is arranged on the outer side of the part, connected with the middle nut, of the sleeve.
The invention also provides an assembly type building, which uses the friction type double-thread component, so that better pulling resistance is obtained.
In conclusion, the invention has the following beneficial effects:
1, the threaded friction rod can be easily and visually inserted into the combined nut, a reasonable fault-tolerant range is provided, and the success rate of group rod anchoring is improved;
2, under the action of external force, the friction rod and the combined nut are combined to form staged combined force (friction force and end bearing force), so that the whole connecting system is in a ductile failure state instead of brittle failure;
3, the friction rod is combined with the combined nut, a mutual meshing state is formed between threads, and then the threads are processed in strength, so that a huge meshing force can be formed, the connection strength and the tension force of the assembly are increased, and the engineering requirement is met;
4, the end bearing force of the step and the matching of the inner side of the middle nut and the bending part of the outer side of the combined nut enable the biting force to be improved as the middle nut is more extruded;
5, the elastic hoop ring is hooped to effectively avoid the dispersion of combined threads, so that the combined threads have more stable resultant force on the friction threaded rod;
4, the resistance bar can stretch into the screw thread friction lever and form the locking structure to improve holistic resistance to plucking dynamics.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic structural diagram according to a first embodiment;
FIG. 3 is a schematic structural diagram according to a second embodiment;
FIG. 4 is a schematic structural diagram of the third embodiment;
FIG. 5 is a first schematic structural diagram according to a fourth embodiment;
FIG. 6 is a second schematic structural diagram according to a fourth embodiment;
FIG. 7 is a third schematic structural view according to a fourth embodiment;
FIG. 8 is an enlarged view of section A of FIG. 7;
FIG. 9 is a first schematic view of an installation process according to a fifth embodiment;
FIG. 10 is a second schematic view of an installation process according to the fifth embodiment;
FIG. 11 is a third schematic view of the installation process of the fifth embodiment;
FIG. 12 is a fourth schematic view showing an installation process according to the fifth embodiment;
fig. 13 is a schematic view of an installation process of the fifth embodiment.
In the figure: 1. a connecting rod; 2. a projecting step; 3. a sleeve; 4. a limiting baffle plate; 5. a threaded friction bar; 6. a sleeve; 7. a middle nut; 8. a combination nut; 9. an elastic member; 10. a reduction tray; 11. a resistance bar; 12. a resistance hole; 13. a thimble; 14. a reinforcing portion; 15. a step; 16. a first bent portion; 17. a second bent portion; 18. a third bent portion; 19. an elastic band; 20. an annular groove; 21. prefabricating a concrete member; 22. a main rib; 23. a fitting sleeve.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The first embodiment is as follows:
a friction type double-thread connecting component is shown in figure 2 and mainly comprises two parts, namely a thread friction rod 5 and a sleeve 6, wherein one end face of the sleeve 6 is at least provided with an opening, and one end of the thread friction rod 5 is provided with an external thread; an intermediate nut 7 is arranged in the sleeve 6, and the intermediate nut 7 can be fixed at the opening of the sleeve 6 in a threaded connection mode.
The inner wall of the middle nut 7 is in a hollow round table shape, the narrow end face of the middle nut is flush with one end face of the opening of the sleeve 6, the aperture of the end face is smaller than that of the other end, as shown in the attached drawing 2, the upper end face is smaller, and the lower end face is larger.
Still install combination nut 8 in middle nut 7, combination nut 8 is provided with at least two, can set up to three usually, and three all is the fan-shaped setting of circular arc, and its surface can laminate with the inner wall of middle nut 7, and its inner surface is provided with the internal thread and is used for forming threaded connection with the external screw thread cooperation of screw friction pole 5, has the clearance between the adjacent combination nut 8, be used for when screw friction pole 5 inwards extrudees combination nut 8, when combination nut 8 takes place to the great one end in middle nut 7 aperture and moves, the clearance between the adjacent combination nut 8 becomes big, and when screw friction pole 5 installed in place and pulled back, when combination nut 8 retracted to the less one end in middle nut 7 aperture, the clearance between the adjacent combination nut 8 becomes little.
And still install elastic component 9 in sleeve 6, elastic component 9 can select for use the spring, and the one end of spring is contradicted on sleeve 6's inner wall, and the other end is contradicted with combination nut 8.
Certainly, in order to better apply acting force to the combined nut 8, a reduction tray 10 may be additionally arranged between the combined nut 8 and the elastic member 9, the reduction tray 10 is arranged in a circular ring shape, the middle of the reduction tray is hollow for a threaded friction rod to pass through, one end surface of the reduction tray 10 abuts against the middle nut 7 and the combined nut 8, and the other end of the reduction tray abuts against the elastic member 9.
Example two:
the difference between the second embodiment and the first embodiment is that: as shown in fig. 3, a step 15 is integrally formed at the narrower end of the intermediate nut 7, and the step 15 is used for enabling the end surface of the step 15 to be abutted against the end surface of the sleeve 6 when the intermediate nut 7 is mounted on the sleeve 6, so as to limit the further penetration of the intermediate nut 7; the inner wall of the middle nut 7 is provided with three parts, namely a first bent part 16 positioned at the narrower end, a second bent part 17 positioned at the middle part and a third bent part 18 positioned at the wider end, wherein the first bent part 16 is bent towards the hollow part of the middle nut 8, and the third bent part 18 is bent towards the solid part of the middle nut 7; the outer wall of the combined nut 8 is matched with the inner wall of the middle nut 7; the structure is that the side wall of the original hollow round table of the middle nut 7 is provided with three bent parts, the slopes of the three bent parts are not consistent, and the outer wall of the combined nut 8 is adapted to the combined nut 8, so that when the combined nut 8 is abutted to the middle nut 7, the corresponding first bent part 16, second bent part 17 and third bent part 18 can provide different locking forces to limit the combined nut 8; the interference force between the middle nut 7 and the combined nut 8 can be further enhanced, when the threaded friction rod 5 is pulled out, the combined nut 8 can be interfered by the first bent part 16, the second bent part 17 and the third bent part 18, so that the threaded friction rod 5 can be more tightly tightened, and more extrusion force to the threaded friction rod 5 can be obtained.
Example three:
the difference between the third embodiment and the first embodiment is that: as shown in fig. 4, an elastic hoop 19 is provided around the outer wall of the combination nut 8, and may be a conventional steel wire ring with elastic expansion force; in addition, for better limiting the elastic hoop 19, an annular groove 20 can be formed in the outer wall of the combined nut 8, that is, when at least two combined nuts 8 are surrounded, the outer side of each combined nut forms the annular groove 20, the elastic hoop 19 can be contracted in the annular groove 20, so that the up-and-down sliding of the elastic hoop 19 is limited, and for further increasing the stability of the elastic hoop 19, a reinforcing rib can be arranged on the inner wall of the middle nut 7, the position of the reinforcing rib can be just matched with the annular groove 20, when the threaded friction rod 5 is just tightened in the sleeve 6, the reinforcing rib extends into the annular groove 20 to abut against the annular groove 20, so that the combined nuts 8 are better limited; certainly, the elastic hoop 19 can also be magnetized, so that the elastic hoop has magnetic property and can be better adsorbed in the annular groove 20; this scheme can effectively improve combination nut 8's stability, because at the in-process that screw thread friction lever 5 stretched into sleeve 6, combination nut 8 can receive the extrusion and take place the dispersion, and the effect through elasticity hoop 19 this moment can effectively improve combination nut 8 stability of mutually supporting to can play better restriction effect to screw thread friction lever 5.
Example four:
the difference between the fourth embodiment and the first embodiment is that: as shown in fig. 5, 6, 7 and 8, in order to further increase the connection stability between the threaded friction rod 5 and the sleeve 6, a resistance rod 11 is further disposed on the reduction tray 10, a resistance hole 12 is further formed in the side surface of the threaded friction rod 5, and the resistance rod 11 can extend into the resistance hole 12 to lock the threaded friction rod 5 and the sleeve 6.
The concrete structure can be as follows: the mounting hole has been seted up at the inside wall of reduction tray 10, resistance bar 11 is installed in the mounting hole, and set up the spring between resistance bar 11 and mounting hole and make resistance bar 11 keep contracting in the mounting hole, so for the convenience thread friction lever 5 stretch into and can not receive the influence, and still seted up the through-hole perpendicularly on the mounting hole, the great one end terminal surface fixed mounting in aperture of middle nut 7 has thimble 13, thimble 13 can stretch into conflict extrusion resistance bar 11 in the through-hole, for making resistance bar 11 more convenient stretch out the mounting hole, set the terminal surface of thimble 13 and resistance bar 11's terminal surface into the inclined plane of mutually supporting, when the inclined plane of 13 needle extrudees resistance bar 11's inclined plane like this, can support resistance bar 11, thereby make resistance bar 11 take place lateral shifting and stretch out the mounting hole, and the resistance hole 12 of seting up of thread friction lever 5 this moment moves to this position just, make resistance bar 11 can stretch into resistance hole 12, thereby restriction thread friction lever 5 can not break away from sleeve 6.
When the friction type double-thread connecting assembly is actually used, as shown in fig. 5, the thread friction rod 5 and the sleeve 6 are separated and are respectively installed in two materials to be connected, and then the thread friction rod 5 is inserted into the sleeve 6, that is, as shown in fig. 6, when the thread friction rod 5 extends into the sleeve 6, the combination nut 8 is firstly pressed, the combination nut 8 moves towards one end with a larger aperture of the middle nut 7 and extends out of the middle nut 7, so that the reduction tray 10 slides in the sleeve 6, the elastic member 9 is compressed until the thread friction member 5 is installed in place, as shown in fig. 7, the combination nut 8 is retracted into the middle nut 7 under the action of thread tightening, and is in tight contact with the middle nut 7, and a tighter fit is realized under the interference action of the elastic member 9, and the thimble 13 is separated from the reduction tray 10 when the reduction tray 10 slides in the sleeve 6, at the moment, the resistance rod 11 is retracted in the mounting hole under the action of the spring, when the threaded friction rod 5 is mounted in place, the reduction tray 10 is in contact with the end surface of the middle nut 7 under the action of the elastic element 9, so that the thimble 13 extends into the mounting hole to be abutted against the resistance rod 11, the resistance rod 11 extends out of the mounting hole to extend into the resistance hole 12 against the tensile force of the spring, as shown in fig. 5, so that the resistance rod 11 is transversely arranged between the threaded friction rod 5 and the reduction tray 10, when the threaded friction rod 5 is pulled, not only the tightening acting force of the combined nut 8 is limited, but also the resistance rod 11 can limit, thereby the anti-pulling capacity of the combined nut is improved, and when a large pulling force occurs, because the threaded friction rod 5 is in threaded fit with the combined nut 8, the process of ductile failure is achieved, the method has the advantages that brittle fracture does not directly occur, and ductile failure brings the advantage that the time for separating fracture can be prolonged, so that when the method is applied to the field of buildings, enough buffering time can be provided, and people can conveniently make an emergency response.
In the above embodiment, in order to increase the structural strength of the sleeve 6, the reinforcing portion 14 may be provided on the outer side of the portion where the intermediate nut 7 is mounted, and the thickness of the reinforcing portion 14 is thicker than the thickness of the other portion of the sleeve 6.
Example five:
a fabricated building in which building components are fabricated using the structure of one or two or three or four of the above embodiments, as shown in fig. 9 to 13, fig. 9 being a state before an integral concrete member is assembled; FIG. 10 is a state after the integral concrete member is assembled; FIGS. 11, 12 and 13 are detail views before, during and after splicing, respectively; the threaded friction rod is arranged in a precast concrete member, and the concrete member can be a solid or hollow rectangular or tubular or polygonal concrete pile; referring to fig. 11, an adaptive sleeve 23 may be adapted to the threaded friction rod 5, the adaptive sleeve 23 is embedded in the precast concrete member 21 and combined with a main bar 22, and the main bar may be a prestressed steel bar, a deformed steel bar, a steel strand, a carbon fiber steel, or the like; when the threaded friction rod 5 needs to be installed, one end of the threaded friction rod 5 can be connected into the adapting sleeve 23 in a threaded manner, a reinforcing part can be arranged on the outer side of the part, connected with the threaded friction rod 5, of the adapting sleeve 23 for structural reinforcement, so that the structural strength of the adapting sleeve 23 is increased, and the sleeve 6 is embedded in the corresponding other precast concrete member 21 and is combined with the main rib 22 in the precast concrete member 21; then, the two precast concrete members 21 are combined, and the threaded friction rod 5 is directly inserted into the sleeve 6 to form locking fixation, so that when the two building components are subjected to external force and have a separation trend, the threaded friction rod can be tightly fixed with the sleeve, and the separation phenomenon is difficult to occur; of course, other mounting methods can be adopted to fix the threaded friction rod 5 and the sleeve 6 in two members to be combined respectively, and then the mounting and the combination are carried out through a plug-in manner.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (12)
1. A friction type double-thread connecting component is characterized in that: the thread friction rod comprises a thread friction rod (5) and a sleeve (6), wherein at least one end of the sleeve (6) is provided with an opening for the thread friction rod (5) to extend into; install middle nut (7) and combination nut (8) in sleeve (6), the inner wall at sleeve (6) opening part is fixed in middle nut (7), middle nut (7) inner wall is round platform form setting and narrower one end is located the opening part, combination nut (8) are provided with at least two and evenly distributed at the internal surface of middle nut (7), have the clearance between adjacent combination nut (8), combination nut (8) outer wall can be contradicted at the inner wall of middle nut (7) and can take place relative slip, the inner wall of combination nut (8) have the screw thread and with the external screw thread looks adaptation of screw thread friction lever (5), be provided with in sleeve (6) elastic component (9) and be used for conflicting combination nut (8).
2. A friction-type double-threaded connection assembly according to claim 1, wherein: a reduction tray (10) is additionally arranged between the combined nut (8) and the elastic piece (9).
3. A friction-type double-threaded connection assembly according to claim 2, wherein: the reduction tray (10) is arranged in a circular ring shape, one side surface of the reduction tray is in contact with the end surfaces of the middle nut (7) and the combined nut (8), the other side surface of the reduction tray is in direct contact with the elastic piece (9), and the center part of the reduction tray (10) is used for the threaded friction rod (5) to penetrate through.
4. A friction-type double-threaded connection assembly according to claim 1, wherein: the middle nut (7) is provided with a step (15) at the narrower end thereof for abutting against the end face of the sleeve (6).
5. A friction type double-threaded connection assembly according to claim 4, wherein: the inner wall of the middle nut (7) is provided with three parts, namely a first bent part (16) positioned at the narrower end, a second bent part (17) positioned at the middle part and a third bent part (18) positioned at the wider end; the first bent part (16) is bent towards the hollow part of the middle nut (7), and the third bent part (18) is bent towards the solid part of the middle nut (7); the outer wall of the combined nut (8) is matched with the inner wall of the middle nut (7).
6. A friction-type double-threaded connection assembly according to claim 1, wherein: and an elastic hoop (19) is hooped on the outer ring of the combined nut (8).
7. A friction type double-threaded connection assembly according to claim 6, wherein: an annular groove (20) is formed in the outer ring of the combined nut (8) and used for limiting the displacement of the elastic hoop (19).
8. A friction-type double-threaded connection assembly according to claim 7, wherein: the inner wall of the combined nut (8) is provided with a reinforcing rib which is used for extending into the annular groove (20) to abut against the elastic hoop (19).
9. A friction type double-threaded connection assembly according to claim 6, wherein: the elastic band (19) has magnetism.
10. A friction-type double-threaded joint assembly according to claim 1, 4 or 6, wherein: the middle nut (7) is connected with the sleeve (6) through threads.
11. A friction-type double-threaded connection assembly according to claim 10, wherein: and a reinforcing part (14) is arranged on the outer side of the part, connected with the middle nut (7), of the sleeve (6).
12. An assembly type building, characterized in that: use of a friction-type double-threaded connection assembly according to any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310233887.8A CN115928721B (en) | 2023-03-13 | 2023-03-13 | Friction type double-thread connecting assembly and assembled building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310233887.8A CN115928721B (en) | 2023-03-13 | 2023-03-13 | Friction type double-thread connecting assembly and assembled building |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115928721A true CN115928721A (en) | 2023-04-07 |
| CN115928721B CN115928721B (en) | 2023-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310233887.8A Active CN115928721B (en) | 2023-03-13 | 2023-03-13 | Friction type double-thread connecting assembly and assembled building |
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| CN (1) | CN115928721B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120237315A1 (en) * | 2011-03-17 | 2012-09-20 | Ming-Chung Chiu | Floating fastener |
| CN211973851U (en) * | 2019-10-28 | 2020-11-20 | 周兆弟 | Assembled building part |
| CN212688935U (en) * | 2020-04-16 | 2021-03-12 | 海盐机械设备制造有限公司 | Prestressed pipe pile connecting piece |
| CN217105064U (en) * | 2022-04-06 | 2022-08-02 | 衡水百纳机械连接设备有限公司 | Tubular pile connecting assembly |
| CN217976991U (en) * | 2022-07-20 | 2022-12-06 | 福建省华盖机械制造有限公司 | Fastening nut assembly capable of reducing looseness |
-
2023
- 2023-03-13 CN CN202310233887.8A patent/CN115928721B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120237315A1 (en) * | 2011-03-17 | 2012-09-20 | Ming-Chung Chiu | Floating fastener |
| CN211973851U (en) * | 2019-10-28 | 2020-11-20 | 周兆弟 | Assembled building part |
| CN212688935U (en) * | 2020-04-16 | 2021-03-12 | 海盐机械设备制造有限公司 | Prestressed pipe pile connecting piece |
| CN217105064U (en) * | 2022-04-06 | 2022-08-02 | 衡水百纳机械连接设备有限公司 | Tubular pile connecting assembly |
| CN217976991U (en) * | 2022-07-20 | 2022-12-06 | 福建省华盖机械制造有限公司 | Fastening nut assembly capable of reducing looseness |
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| Publication number | Publication date |
|---|---|
| CN115928721B (en) | 2023-06-02 |
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