CN219410523U - Large-diameter steel bar self-locking anchorage device pre-buried in bearing platform and prefabricated pier - Google Patents
Large-diameter steel bar self-locking anchorage device pre-buried in bearing platform and prefabricated pier Download PDFInfo
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- CN219410523U CN219410523U CN202320678251.XU CN202320678251U CN219410523U CN 219410523 U CN219410523 U CN 219410523U CN 202320678251 U CN202320678251 U CN 202320678251U CN 219410523 U CN219410523 U CN 219410523U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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Abstract
The utility model relates to a self-locking anchorage of a large-diameter steel bar, which is pre-buried in a bearing platform, wherein the lower end of the large-diameter steel bar is anchored, the lower end of the large-diameter steel bar is sleeved with a steel backing plate, and the self-locking anchorage comprises an annular frame, a clamping pin, a spring and a protective cover; the annular inner wall of the annular frame is provided with a plurality of circumferentially arranged backset grooves, and the backset grooves, the springs and the bayonet locks are arranged in a one-to-one correspondence manner; the inner side of the upper end of the bayonet lock is provided with an inclined part which bears external force and is inclined from the inner lower part to the outer upper part; the outer side of the bayonet lock is connected with the bottom of the rollback groove through a spring, the bayonet lock slides along the radial direction of the rollback groove, and is rolled back into the rollback groove for the steel backing plate to pass through under the action of external force, and the steel backing plate is prevented from being pulled out when the steel backing plate is stretched out to a self-locking state under the action of the spring force; the annular frame is disposed within the protective cover. And also relates to a prefabricated pier. The utility model has simple structure and convenient operation, and belongs to the technical field of prefabricated piers.
Description
Technical Field
The utility model relates to the technology of prefabricated piers, in particular to a large-diameter steel bar self-locking type anchorage device pre-buried in a bearing platform, and also relates to a prefabricated pier adopting the self-locking type anchorage device.
Background
The traditional bridge pier construction mostly adopts a mode of on-site integral pouring, and has the defects of long construction period, easy traffic jam on site, environmental pollution and the like. In recent years, the prefabricated pier has the advantages of ensuring the quality of prefabricated components, reducing site construction operation, having small influence on environment, meeting the development planning requirement of the building industry with the 'double carbon' target in China and having wide application prospect in bridge construction.
The assembled bridge pier is formed by dividing the whole bridge pier (mainly comprising a bearing platform, a pier body and a capping beam) into a plurality of components, prefabricating the components respectively, and splicing the components on site. The connection between the components is the most critical factor influencing the overall stress and the earthquake resistance of the assembled pier, the most common method in the current engineering is grouting sleeve connection, namely, the sleeve is pre-buried in the pier stud, the steel bars of the components are inserted into the sleeve during splicing, and grouting is carried out from a reserved pipe orifice. In actual engineering, the number of longitudinal steel bars of the pier stud is large, the accuracy requirement on centering with the sleeve is high, and the construction difficulty is high; the steel bars between the components are not connected, the force transmission is completed by means of the binding force between grouting materials and the steel bars, however, the sleeve belongs to a concealed project, and potential safety hazards are easily caused if the grouting materials are leaked or not fully filled.
The scholars propose to adopt the prestressing tendons to carry out the connection of assembled pier, and prestressing force connected mode can increase the self-reset ability of pier, and is very favorable to the shock resistance of pier, however, the anchor of prestressing tendons is technical difficulty, and traditional prestressing force ground tackle needs to anchor with the help of the clamping piece, exert mechanical force, is difficult to implement in the assembled pier, consequently, convenient, reliable is applicable to the anchor device of assembled pier and is waited to research and development urgently.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the utility model aims at: the large-diameter steel bar self-locking anchorage device pre-buried in the bearing platform can be used for anchoring connecting steel bars of an assembled bridge pier.
Another object of the utility model is: the prefabricated pier is connected by adopting large-diameter steel bars on the basis of adopting the self-locking anchorage, is easy to assemble and has good overall stress performance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the self-locking anchor device for the large-diameter steel bars is embedded in the bearing platform, the lower ends of the large-diameter steel bars are anchored, and the lower ends of the large-diameter steel bars are sleeved with steel backing plates; the self-locking anchorage comprises an annular frame, a bayonet lock, a spring and a protective cover; the annular inner wall of the annular frame is provided with a plurality of circumferentially arranged backset grooves, and the backset grooves, the springs and the bayonet locks are arranged in a one-to-one correspondence manner; the inner side of the upper end of the bayonet lock is provided with an inclined part which bears external force and is inclined from the inner lower part to the outer upper part; the outer side of the bayonet lock is connected with the bottom of the rollback groove through a spring, the bayonet lock slides along the radial direction of the rollback groove, and is rolled back into the rollback groove for the steel backing plate to pass through under the action of external force, and the steel backing plate is prevented from being pulled out when the steel backing plate is stretched out to a self-locking state under the action of the spring force; the annular frame is disposed within the protective cover.
Preferably, the number of the clamping pins is at least four, and the clamping pins are uniformly distributed on the circumference of the plane; the steel backing plate is a round steel backing plate and is welded or screwed into the lower end of the large-diameter steel bar through threads.
Preferably, the protective cover wraps the whole bottom and the whole side face of the annular frame, wraps the outer side of the top of the annular frame, and is provided with an opening at the inner side of the upper end of the protective cover, wherein the position of the opening corresponds to the position of the annular inner wall of the annular frame.
The prefabricated pier comprises a bearing platform, a prefabricated pier body, a prefabricated capping beam, common reinforcing steel bars and grouting materials, wherein the common reinforcing steel bars are arranged in the prefabricated pier body; the prefabricated bridge pier also comprises large-diameter steel barsSteel backing plate, screw cap, corrugated pipe and self-locking anchor; the bellows comprises a diameter D 1 Bellows I and diameter D 2 Bellows II, D of (C) 2 Greater than D 1 The corrugated pipe I is arranged in the prefabricated pier body and the prefabricated capping beam, and the corrugated pipe II is arranged in the bearing platform; a self-locking anchor is buried below the corrugated pipe II in the bearing platform; the large-diameter steel bars penetrate through the bearing platform, the prefabricated pier body and the corrugated pipes in the prefabricated capping beams to connect the bearing platform, the prefabricated pier body and the prefabricated capping beams, and nuts are connected to the upper ends of the large-diameter steel bars so as to anchor the upper ends of the large-diameter steel bars; the grouting material is filled in the corrugated pipe.
Preferably, the steel backing plate has an outer diameter less than D 2 So that the steel backing plate can pass through the corrugated pipe II.
Preferably, the lower end of the corrugated pipe II is connected with the opening of the protective cover, and the joint of the seam is sealed.
Preferably, the number of the large-diameter reinforcing steel bars is a plurality, the large-diameter reinforcing steel bars are arranged around the prefabricated pier body, and at least one large-diameter reinforcing steel bar is arranged at each corner of the prefabricated pier body.
Preferably, the prefabricated pier body is prefabricated in a section mode or prefabricated in a section mode; when the subsection is prefabricated, corrugated pipes I are arranged in each section of prefabricated pier body, and large-diameter reinforcing steel bars penetrate through each section of corrugated pipes I to connect each section of prefabricated pier body.
Preferably, the large-diameter steel bar is of a one-section structure or a multi-section structure; when the multi-section structure is adopted, all sections of large-diameter steel bars are connected through sleeve connectors, and threaded sections are arranged at two ends of each section of large-diameter steel bar.
Preferably, the top of the prefabricated cover beam is provided with a shallow groove, and the screw cap is positioned in the shallow groove.
The principle of the utility model is as follows: the self-locking anchorage device pre-buried in the bearing platform is designed, the operation is convenient, and the anchorage of the large-diameter steel bar end is realized; on the premise of adopting a self-locking anchorage device, the large-diameter steel bars are utilized to penetrate through the prefabricated pier body and the prefabricated capping beam, and each component of the assembled pier forms an integral stress; pre-stressing the large-diameter steel bars to improve the earthquake resistance of the pier column; the high strength and large area of the large-diameter steel bars are utilized, the number of holes reserved for splicing in the components is reduced, and the construction is convenient.
The utility model has the following advantages:
1. the self-locking type anchor device is simple in structure, convenient to operate, suitable for being used for an assembled bridge pier and capable of being connected by large-diameter steel bars after being embedded in the bearing platform.
2. The large-diameter steel bars penetrate through the whole pier structure, and the bearing platform, the pier column and the capping beam which are independently manufactured are connected into a system, so that the aim of integral stress is fulfilled.
3. The high strength and large area of the large-diameter steel bars are utilized, compared with the common stressed steel bars, the number of the steel bars is reduced under the condition of equal stress, and then the number of preset holes in each component is reduced, so that the splicing construction is simple and quick.
4. The self-locking anchorage device is utilized to realize the anchorage of the end head of the large-diameter steel bar; and prestress is applied to the large-diameter steel bars, so that the crack resistance of the pier is improved, the self-resetting capacity of the pier top is enhanced, and the earthquake resistance of the pier column is improved.
5. The self-locking anchorage is embedded in the bearing platform, the large-diameter steel bars are directly inserted, self-locking is realized, anchoring is reliable, the construction difficulty of prestress bar beam penetration is reduced, and the construction efficiency is accelerated.
Drawings
Fig. 1 is a schematic elevation view of a prefabricated pier connected by self-locking large-diameter steel bars.
FIG. 2 is a cross-sectional view of the prefabricated pier body A-A of FIG. 1.
Fig. 3 is an enlarged fragmentary elevational view of the connection of the self-locking anchor at B in fig. 1 to the large diameter rebar.
Fig. 4 is an enlarged top view of a portion of the connection of the self-locking anchor at B in fig. 3 to a large diameter rebar.
Fig. 5 is a schematic view of prefabricated pier assembled front members.
Fig. 6 is a constructional elevation of the self-locking anchor.
Fig. 7 is a top view of the self-locking anchor configuration of fig. 6.
1 is a bearing platform, 2 is a prefabricated pier body, 3 is a prefabricated capping beam, 4 is a self-locking anchorage, 5 is a large-diameter steel bar, 6 is a nut, 7 is a common steel bar, 8 is a corrugated pipe I, 9 is a corrugated pipe II, 10 is grouting material, 11 is a grouting hole, 12 is a shallow groove, 13 is an annular frame, 14 is a bayonet lock, 15 is a spring, 16 is a protective cover, 17 is a steel backing plate, 18 is a rollback groove, and 19 is an inclined part.
Detailed Description
The present utility model will be described in further detail with reference to the following embodiments.
Example 1
The self-locking anchor device for the large-diameter steel bars is embedded in the bearing platform, the lower ends of the large-diameter steel bars are anchored, and the lower ends of the large-diameter steel bars are sleeved with steel backing plates; the self-locking anchorage comprises an annular frame, a bayonet lock, a spring and a protective cover; the annular inner wall of the annular frame is provided with a plurality of circumferentially arranged backset grooves, and the backset grooves, the springs and the bayonet locks are arranged in a one-to-one correspondence manner; the inner side of the upper end of the bayonet lock is provided with an inclined part which bears external force and is inclined from the inner lower part to the outer upper part; the outer side of the bayonet lock is connected with the bottom of the rollback groove through a spring, the bayonet lock slides along the radial direction of the rollback groove, and is rolled back into the rollback groove for the steel backing plate to pass through under the action of external force, and the steel backing plate is prevented from being pulled out when the steel backing plate is stretched out to a self-locking state under the action of the spring force; the annular frame is disposed within the protective cover.
The number of the bayonet locks is at least four, and the bayonet locks are uniformly distributed on the circumference of a plane; the steel backing plate is a round steel backing plate and is welded or screwed into the lower end of the large-diameter steel bar through threads. The number of the connecting modes is four in the embodiment, and the connecting modes are welding.
The protection cover wraps the whole bottom and the whole side face of the annular frame, wraps the outer side of the top of the annular frame, and is provided with an opening at the inner side of the upper end of the protection cover, and the position of the opening corresponds to the position of the annular inner wall of the annular frame. The protective cover is arranged, so that the concrete of the bearing platform is prevented from entering the self-locking anchorage device, and the normal operation of the anchorage device is prevented from being influenced.
The operation method is as follows:
the large-diameter steel bar and the steel backing plate are inserted into the self-locking anchorage device, the end part of the large-diameter steel bar penetrates into the space between the four clamping pins firstly, the steel backing plate presses down the inclined part of the clamping pins along with the pressing down of the large-diameter steel bar, the downward pressure is converted into radial external force under the action of the inclined part, the clamping pins slide radially outwards in the rollback groove, the intermediate space of the anchorage device is increased until the steel backing plate passes through, the clamping pins rebound under the action of the spring, and therefore the clamping pins block the steel backing plate to be pulled out, and the anchoring of the lower end of the large-diameter steel bar is realized.
Example two
The prefabricated pier comprises a bearing platform, a prefabricated pier body (also called a prefabricated pier column), a prefabricated capping beam, common reinforcing steel bars and grouting materials, wherein the common reinforcing steel bars are arranged in the prefabricated pier body; the prefabricated pier further comprises large-diameter steel bars, steel backing plates, nuts, corrugated pipes and self-locking anchorage devices; the bellows comprises a diameter D 1 Bellows I and diameter D 2 Bellows II, D of (C) 2 Greater than D 1 The corrugated pipe I is arranged in the prefabricated pier body and the prefabricated capping beam, and the corrugated pipe II is arranged in the bearing platform; a self-locking anchor is buried below the corrugated pipe II in the bearing platform; the large-diameter steel bars penetrate through corrugated pipes in the bearing platform, the prefabricated pier body and the prefabricated capping beam to connect the bearing platform, the prefabricated pier body and the prefabricated capping beam, the upper ends of the large-diameter steel bars are tensioned by adopting jacks, and nuts are screwed to keep the applied pretightening force; grouting material is injected from bottom to top from the grouting holes at the bottom of the corrugated pipe, and the corrugated pipe is filled with grouting material.
The longitudinal reinforcement of prefabricated pier stud includes two parts: major diameter steel bar and common steel bar with diameter d respectively 1 、d 2 The large-diameter steel bars are arranged around the pier column, the number of the large-diameter steel bars is determined according to the stress of the pier column, and at least 1 large-diameter steel bars are arranged at the corners of the pier column; the large-diameter steel bar is preferably high-strength steel bar with HRB500 or finish-rolled deformed steel bar with diameter d 1 32-50 mm; the large-diameter steel bar is of a one-section structure or a multi-section structure; when the reinforcing steel bar is longer, when adopting multistage formula structure, connect through sleeve connector between each section major diameter reinforcing steel bar, for convenient the connection, the both ends of each section major diameter reinforcing steel bar set up the screw thread section.
When the pier stud is prefabricated, the corrugated pipe I is embedded in the position of the large-diameter reinforcing steel bar, and the diameter is D 1 The corrugated pipe at the bottom of the pier column extends out by a certain length (L is more than or equal to 100 mm) so as to be sleeved with the corrugated pipe of the bearing platform. The common longitudinal ribs are uniformly arranged along the periphery of the pier stud and mainly play a role in cracking resistance, and the gradeHRB400 and diameter d are preferably used 2 Less than or equal to 25mm. The design and manufacturing requirements of the common longitudinal ribs and stirrups of the pier column are the same as those of the conventional pier column. The prefabricated pier body is prefabricated in a one-section mode or in a sectional mode; when the pier stud is higher, when the sectional prefabrication is adopted, the corrugated pipe I is arranged in each section of prefabrication pier body, and the large-diameter reinforcing steel bar penetrates through each section of corrugated pipe I to connect each section of prefabrication pier body.
When the bearing platform is poured, a corrugated pipe II and a self-locking anchor corresponding to the pier column large-diameter steel bar are embedded in the bearing platform, and the self-locking anchor is located at the bottom of the corrugated pipe II. Bellows II diameter D in bearing platform 2 Diameter D of corrugated pipe I in pier column 1 Large. In order to prevent the blocking caused by cement slurry flowing in during the concrete pouring of the bearing platform, the top surface of the corrugated pipe is higher than the surface of the bearing platform, and the pipe orifice is temporarily closed; the lower end of the corrugated pipe II is connected with the protective cover, and the joint of the corrugated pipe II and the protective cover is sealed, so that the slurry is prevented from flowing into the protective cover to cause blockage when the concrete of the bearing platform is poured.
When the bent cap is prefabricated, the corrugated pipe I corresponding to the pier stud large-diameter reinforcing steel bar is embedded, the corrugated pipe I penetrates through the bent cap, and the diameter of the corrugated pipe I is D 1 . The top of the prefabricated bent cap is provided with a shallow groove, a screw cap is positioned in the shallow groove, and the screw cap is screwed down after the large-diameter steel bar is stretched to keep the applied pretightening force.
The number of the pre-buried corrugated pipes in the bearing platform, the prefabricated pier stud and the prefabricated capping beam is the same as the number of the large-diameter reinforcing steel bars, the positions are in one-to-one correspondence, the prefabricated capping beam is the same as the type I of the corrugated pipe in the prefabricated pier stud, and the diameter D of the corrugated pipe II in the bearing platform is the same as the type I of the corrugated pipe 2 Diameter D of corrugated pipe I in pier column 1 Large to facilitate passage of the steel backing plate.
The steel backing plate is sleeved and fixed at the lower end of the large-diameter steel bar, and the outer diameter of the steel backing plate is smaller than D 2 The method comprises the steps of carrying out a first treatment on the surface of the The self-locking anchorage comprises an annular frame, a bayonet lock, a spring and a protective cover, wherein a plurality of rollback grooves which are circumferentially arranged and used for accommodating the bayonet lock are formed in the annular inner wall of the annular frame; the rollback groove, the spring and the bayonet lock are arranged in a one-to-one correspondence; the clamping pin is connected in the retraction groove through a spring, and extends out of the retraction groove under the action of the spring and retracts into the retraction groove under the action of external force; the inner upper end of the bayonet is provided with an inclined part which is inclined from the inner lower part to the outer upper partThe inclined part is used as a stress surface for bearing the downward pressure of the steel backing plate; the annular frame is disposed within the protective cover. The number of the bayonet locks is four, and the bayonet locks are arranged in a cross shape on a plane. The large-diameter steel bar passes through a corrugated pipe I pre-buried in the pier stud, extends out of the bottom of the pier stud, is inserted into an anchorage device along a corrugated pipe II pre-buried in a bearing platform after being provided with a round steel backing plate, and locks the steel backing plate at the end of the steel bar through a spring clamping piece so as to achieve the self-locking purpose; when the prestress is applied to the top end of the large-diameter reinforcing steel bar, upward displacement is not generated, so that the anchoring effect is achieved. The self-locking prestress anchor has the working mechanism that the round steel backing plate at the end pushes the bayonet lock along with the insertion of the large-diameter steel bar, and the spring in the anchor is retracted, and the bayonet lock also retracts along with the spring, so that the steel backing plate and the steel bar can smoothly pass through. After the steel bar passes through the anchorage device, the spring drives the bayonet lock to reset, and the bayonet lock plays a role in anchoring the large-diameter steel bar after reset. The self-locking type anchor device is required to be sized according to the size of the prestress applied to the large-diameter steel bar, so that the steel backing plate can be clamped and not pulled out in the prestress application process.
The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a pre-buried major diameter reinforcing bar self-locking ground tackle in the cushion cap, anchor major diameter reinforcing bar's lower extreme, steel backing plate, its characterized in that are cup jointed to major diameter reinforcing bar's lower extreme: the self-locking anchorage comprises an annular frame, a bayonet lock, a spring and a protective cover; the annular inner wall of the annular frame is provided with a plurality of circumferentially arranged backset grooves, and the backset grooves, the springs and the bayonet locks are arranged in a one-to-one correspondence manner; the inner side of the upper end of the bayonet lock is provided with an inclined part which bears external force and is inclined from the inner lower part to the outer upper part; the outer side of the bayonet lock is connected with the bottom of the rollback groove through a spring, the bayonet lock slides along the radial direction of the rollback groove, and is rolled back into the rollback groove for the steel backing plate to pass through under the action of external force, and the steel backing plate is prevented from being pulled out when the steel backing plate is stretched out to a self-locking state under the action of the spring force; the annular frame is disposed within the protective cover.
2. The large diameter steel bar self-locking anchorage embedded in a bearing platform according to claim 1, wherein: the number of the bayonet locks is at least four, and the bayonet locks are uniformly distributed on the circumference of a plane; the steel backing plate is a round steel backing plate and is welded or screwed into the lower end of the large-diameter steel bar through threads.
3. The large diameter steel bar self-locking anchorage embedded in a bearing platform according to claim 1, wherein: the protection cover wraps the whole bottom and the whole side face of the annular frame, wraps the outer side of the top of the annular frame, and is provided with an opening at the inner side of the upper end of the protection cover, and the position of the opening corresponds to the position of the annular inner wall of the annular frame.
4. The prefabricated pier comprises a bearing platform, a prefabricated pier body, a prefabricated capping beam, common reinforcing steel bars and grouting materials, wherein the common reinforcing steel bars are arranged in the prefabricated pier body, and the prefabricated pier is characterized in that: the prefabricated pier further comprises large-diameter steel bars, steel backing plates, nuts, corrugated pipes and the self-locking anchorage device according to any one of claims 1 to 3; the bellows comprises a diameter D 1 Bellows I and diameter D 2 Bellows II, D of (C) 2 Greater than D 1 The corrugated pipe I is arranged in the prefabricated pier body and the prefabricated capping beam, and the corrugated pipe II is arranged in the bearing platform; a self-locking anchor is buried below the corrugated pipe II in the bearing platform; the large-diameter steel bars penetrate through the bearing platform, the prefabricated pier body and the corrugated pipes in the prefabricated capping beams to connect the bearing platform, the prefabricated pier body and the prefabricated capping beams, and nuts are connected to the upper ends of the large-diameter steel bars so as to anchor the upper ends of the large-diameter steel bars; the grouting material is filled in the corrugated pipe.
5. The precast pier according to claim 4, wherein: the outer diameter of the steel backing plate is smaller than D 2 So that the steel backing plate can pass through the corrugated pipe II.
6. The precast pier according to claim 4, wherein: the lower end of the corrugated pipe II is connected with the opening of the protective cover, and the joint of the joint is sealed.
7. The precast pier according to claim 4, wherein: the number of the large-diameter steel bars is multiple, the large-diameter steel bars are arranged around the prefabricated pier body, and at least one large-diameter steel bar is arranged at each corner of the prefabricated pier body.
8. The precast pier according to claim 4, wherein: the prefabricated pier body is prefabricated in a one-section mode or in a sectional mode; when the subsection is prefabricated, corrugated pipes I are arranged in each section of prefabricated pier body, and large-diameter reinforcing steel bars penetrate through each section of corrugated pipes I to connect each section of prefabricated pier body.
9. The precast pier according to claim 4, wherein: the large-diameter steel bar is of a one-section structure or a multi-section structure; when the multi-section structure is adopted, all sections of large-diameter steel bars are connected through sleeve connectors, and threaded sections are arranged at two ends of each section of large-diameter steel bar.
10. The precast pier according to claim 4, wherein: the top of prefabricated bent cap sets up the shallow slot, and the nut is located the shallow slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320678251.XU CN219410523U (en) | 2023-03-29 | 2023-03-29 | Large-diameter steel bar self-locking anchorage device pre-buried in bearing platform and prefabricated pier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320678251.XU CN219410523U (en) | 2023-03-29 | 2023-03-29 | Large-diameter steel bar self-locking anchorage device pre-buried in bearing platform and prefabricated pier |
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| CN219410523U true CN219410523U (en) | 2023-07-25 |
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| CN202320678251.XU Active CN219410523U (en) | 2023-03-29 | 2023-03-29 | Large-diameter steel bar self-locking anchorage device pre-buried in bearing platform and prefabricated pier |
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| CN (1) | CN219410523U (en) |
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