CN212376149U - Connector for connecting unbonded prestressed steel strands in post-cast strip - Google Patents
Connector for connecting unbonded prestressed steel strands in post-cast strip Download PDFInfo
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- CN212376149U CN212376149U CN202021913463.4U CN202021913463U CN212376149U CN 212376149 U CN212376149 U CN 212376149U CN 202021913463 U CN202021913463 U CN 202021913463U CN 212376149 U CN212376149 U CN 212376149U
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Abstract
The utility model provides a connector that is used for post-cast strip in-band to connect unbonded prestress wire. The connector includes: the first anchor plate is arranged on one side of the post-cast strip and applies a tensile force in a first direction to the first end steel strand, and the first anchor plate is fixedly connected with the first end steel strand in the post-cast strip; the second anchor ring is fixedly connected with a second end steel strand in the post-cast strip and applies a tensioning force in a second direction to the second end steel strand; and two ends of the first anchor plate and the second anchor ring are respectively fixedly connected with the connecting structure. The utility model discloses a steel strand wires and first anchor slab adopt the clamping piece to connect, and this kind of structure buries the required precision low underground to steel strand wires length direction. The anchor plate is sealed in the sleeve, is not disturbed by post-cast strip concrete pouring, and has high reliability. The anchor plate is fixed in the anchor plate hole, and the anchor plate atress is even, therefore prestressing force steel strand does not have the bending, and the reinforcing bar also can not produce normal stress in the concrete.
Description
Technical Field
The utility model relates to a building, civil engineering field particularly relate to a connector that is used for post-cast strip in-band to connect unbonded prestress wire.
Background
Conventional prestressed reinforcement connectors, such as the L15 connector of OVM, are usually connected by using an anchor plate shared by the reinforcements on both sides. In the existing connector structure, a reinforcing steel bar on one side is anchored by a clamping piece and penetrates into an anchor plate hole; and the steel bar on the other side is anchored with the prestressed steel strand by adopting an extrusion head and is clamped into the U-shaped groove of the anchor plate. And after being tensioned, the steel strands are arranged in the protective cover and are fixed in a grouting manner.
The connectors described above are generally only suitable for use in splicing together pre-stressed tendons or tendons. When the connector is used for connecting single unbonded prestressed steel bars in a post-cast strip, the prestressed steel bars respectively connected with the two sides of the connector are buried in concrete, so the steel bar adjusting room is small, and the design of a shared anchor plate cannot be adjusted at a prestressed connecting part, so the structural freedom degree of the existing connecting machine is small, and the construction is troublesome when the adjusting steel strand is prestressed and tensioned according to the design requirement; when the anchoring extrusion head arranged in the U-shaped groove is connected with the unbonded prestressed tendon without secondary grouting, the problem that the positioning of the extrusion head is influenced by the fact that the poured casting belt concrete easily disturbs the extrusion head exists.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provide a connector that is used for post-cast strip in-band connection unbonded prestressing force steel strand wires, the utility model discloses specifically adopt following technical scheme.
First, in order to achieve the above objects, there is provided a connector for connecting unbonded prestressed steel strands in a post-cast strip, comprising:
the first anchor plate is arranged on one side of the post-cast strip and fixedly connected with the first end steel strand in the post-cast strip, and tension in the first direction is applied to the first end steel strand.
And the second anchor ring is fixedly connected with a second end steel strand in the post-cast strip and applies a tension force in a second direction to the second end steel strand, wherein the second direction is opposite to the first direction.
And two ends of the connecting structure are fixedly connected with the first anchor plate and the second anchor ring respectively and are used for keeping the first-direction tension force applied by the first anchor plate to the first-end steel strand in the connecting structure and keeping the second-direction tension force applied by the second anchor ring to the second-end steel strand in the connecting structure.
Optionally, in the above-mentioned connector for connecting unbonded prestressed steel strand in post-cast strip, the connection structure includes:
and the first end of the connecting sleeve is fixedly connected with the periphery of the first anchor plate.
And the two ends of the connector are respectively arranged in the connecting sleeve and the second anchor ring and are respectively fixedly connected with the inner peripheries of the connecting sleeve and the second anchor ring.
Optionally, in the connector for connecting unbonded prestressed steel strands in the post-cast strip, the first anchor plate is a single-hole working anchor plate,
the first end of the first anchor plate is abutted to the surface of the side wall of the concrete structure on one side of the post-cast strip, the outer peripheral surface of the second end of the first anchor plate is provided with an anchor plate external thread, and the second end of the first anchor plate is in threaded connection with the first end of the connecting sleeve.
Optionally, in the connector for connecting the unbonded prestressed steel strand in the post-cast strip, the inner circumferential surface of the first end of the second anchor ring is provided with an anchor ring internal thread, and the first end of the second anchor ring is in threaded connection with the second end of the connector.
The outer peripheral surface of the first end of the connector is provided with a connector external thread, and the first end of the connector is in threaded connection with the second end of the connecting sleeve.
Optionally, in the above-mentioned connector for connecting unbonded prestress wire in post-cast strip, the centre of connector still is provided with outside bellied retainer plate, the both sides of retainer plate butt respectively the first end terminal surface of second anchor ring with connecting sleeve's second end terminal surface.
Optionally, in the connector for connecting the unbonded prestressed steel strand in the post-cast strip, the outer peripheral surfaces of the fixing ring and the second anchor ring are respectively provided with a cylindrical slotted hole, and the cylindrical slotted hole is used for installing a screw fastener to fix the connector.
Optionally, in the connector for connecting the unbonded prestressed steel strand in the post-cast strip, a first clamping piece is further arranged in the first anchor plate, and the first clamping piece is abutted between the periphery of the first end steel strand and the mounting hole in the first anchor plate.
And a second clamping piece is further arranged in the second anchor ring and is abutted between the periphery of the second end steel strand and the mounting hole in the second anchor ring.
Optionally, in the foretell connector that is arranged in post-cast strip and connects unbonded prestress wire, be formed with second end steel strand wires between second anchor ring and the connector and hold the chamber, the inboard of connector still is in the first end that second end steel strand wires held the chamber is formed with the step, second end steel strand wires hold the intracavity and still are provided with the return spring, the first end butt of return spring is on the step of connector inboard, the second end butt of return spring is used for right the extrusion force of first direction is applyed to the second clamping piece, and is fixed second end steel strand wires.
Simultaneously, for realizing above-mentioned purpose, the utility model also provides a method that is used for post-cast strip in-band connection unbonded prestress wire, it includes following step:
the method comprises the steps that after concrete strength on two sides of a post-cast strip meets design requirements, a first anchor plate is abutted to the surface of the side wall of the concrete structure on one side of the post-cast strip, the first anchor plate is fixed to the periphery of a first end steel strand in the post-cast strip, the first end steel strand is subjected to prestress tensioning according to the design requirements, and a first clamping piece is arranged between the first anchor plate and the first end steel strand to anchor the first end steel strand.
And secondly, performing anti-corrosion treatment on the structure, and then installing a connecting sleeve on the outer side of the first anchor plate.
And thirdly, fixing a second anchor ring at the periphery of a second end steel strand in the post-cast strip, arranging a second clamping piece between the second anchor ring and the second end steel strand, and anchoring the second end steel strand.
And fourthly, inserting a return spring between the second clamping piece and the connector, screwing the two ends of the connector into the connecting sleeve and the second anchor ring respectively, and fixing and pressing the return spring.
And fifthly, sealing the post-cast strip concrete, and performing pre-stressed tensioning and anchoring on the far end of the second end steel strand according to design requirements after the strength of the post-cast strip concrete meets the design requirements.
Optionally, in the above method for connecting unbonded prestressed steel strands in a post-cast strip, in the first step, before fixing the first anchor plate to the periphery of the first end steel strand in the post-cast strip, the method further includes the following steps: and removing the plastic sheath with the length of 50mm at the end of the first end steel strand, and cleaning grease.
Has the advantages that:
the utility model provides a connector that is used for post-cast strip in-band to connect unbonded prestress wire. The connector includes: the first anchor plate is arranged on one side of the post-cast strip and applies a tensile force in a first direction to the first end steel strand, and the first anchor plate is fixedly connected with the first end steel strand in the post-cast strip; the second anchor ring is fixedly connected with a second end steel strand in the post-cast strip and applies a tensioning force in a second direction to the second end steel strand. The connector also comprises a connecting structure, and two ends of the connecting structure are fixedly connected with the first anchor plate and the second anchor ring respectively. The utility model discloses a steel strand wires and first anchor slab adopt the clamping piece mode to connect, and this kind of structure buries the required precision low underground to steel strand wires length direction. The utility model discloses an anchor slab can seal in the sleeve, does not receive the interference of post-cast strip concrete placement, and the reliability is high. The anchor plate is fixed in the anchor plate hole, and the anchor plate atress is even, therefore prestressing force steel strand does not have the bending, and the reinforcing bar also can not produce normal stress in the concrete.
Preferably, the utility model discloses a bolt-lock mode is fixed anchor ring and is connected the telescopic connection structure between anchor ring and anchor slab, and it can be arranged in the post-cast strip to realize not having the bonding steel strand wires to connect, can satisfy the requirement of design stretch-draw order, still possesses advantages such as the reliability is high, construction convenience. Although the anchor plate can be connected by adopting welding or other connection modes such as flanges, the utility model discloses the atress is clear and definite, the construction is simple and convenient and safe and reliable.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the invention for the purpose of explanation and not limitation of the invention. In the drawings:
fig. 1 is a schematic structural view of the present invention under a force applied in a first direction;
fig. 2 is a schematic structural view of the present invention under a force in a second direction;
in the drawings, 1 denotes a first anchor plate; 21 denotes a first jaw; 22 denotes a second jaw; 3 denotes a connecting sleeve; 4 denotes a connecting head; 5 denotes a return spring; 6 denotes a second anchor ring; 71 denotes a first end strand; 72 denotes a second end strand; and 8 denotes a columnar groove hole.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical solution of the embodiments of the present invention by combining the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that they exist individually or both at the same time.
The meaning of "inside and outside" in the present invention means that the direction pointing to the inside of the connector is inside, and vice versa, with respect to the connector itself; and not to the specific limitations of the device mechanism of the present invention.
The term "connected" as used herein may mean either a direct connection between elements or an indirect connection between elements through other elements.
The utility model discloses in the meaning of "first direction" refer to by the directional direction of second end steel strand wires of first end steel strand wires, the second direction is opposite with first direction.
A connector for connecting unbonded prestressed steel strands within a post-cast strip, comprising:
the first anchor plate 1 is arranged on one side of the post-cast strip as shown in fig. 1, and the anchor plate 1 is fixedly connected with a first end steel strand 71 in the post-cast strip and applies a tension force in a first direction to the first end steel strand. The first anchor plate 1 can specifically adopt a single-hole working anchor plate, the first end of the first anchor plate is abutted to the surface of the side wall of the concrete structure on one side of the post-cast strip, the outer peripheral surface of the second end of the first anchor plate is provided with an anchor plate external thread, and the second end of the first anchor plate 1 is in threaded connection with the first end of the connecting sleeve 3. A first clamping piece 21 is further arranged in the first anchor plate 1 and is abutted between the periphery of the first end steel strand 71 and the mounting hole in the first anchor plate 1. Under the effect of the friction force and the tension force of the first end steel strand 71, the first clamping piece is matched with the first end steel strand 71 and the first anchor plate 1 tightly, so that the anchor plate 1 is fixedly connected with the first end steel strand 71, and the first end steel strand 71 is provided with a more reliable tension force in the first direction.
The second anchor ring 6, as shown in fig. 2, is fixedly connected to the second end strand 72 of the post-cast strip and applies a tension force to the second end strand in a second direction, which is opposite to the first direction. Specifically, the inner peripheral surface of the first end of the second anchor ring 6 is provided with an anchor ring internal thread, and the first end of the second anchor ring 6 is in threaded connection with the second end of the connecting head 4. Still be provided with second clamping piece 22 in the second anchor ring 6, second clamping piece butt in the periphery of second end steel strand wires 72 with between the inside mounting hole of second anchor ring 6, under the effect of the frictional force and the pulling force of second end steel strand wires 72, second clamping piece and second end steel strand wires 72 and with closely cooperate between the second anchor ring 6, realize second anchor ring 6 and the fixed connection of second end steel strand wires 72 provide the tensile force of more reliable second direction for second end steel strand wires 72.
And two ends of the connecting structure are fixedly connected with the first anchor plate 1 and the second anchor ring 6 respectively, and the connecting structure is used for keeping a first-direction tensile force applied by the first anchor plate 1 to the first-end steel strand 71 in the connecting structure and keeping a second-direction tensile force applied by the second anchor ring 6 to the second-end steel strand 72 in the connecting structure. Wherein, the connection structure includes: and a first end of the connecting sleeve 3 is fixedly connected with the periphery of the first anchor plate 1. The connection structure further includes: and two ends of the connector 4 are respectively arranged in the connecting sleeve 3 and the second anchor ring 6 and are respectively fixedly connected with the inner peripheries of the connecting sleeve 3 and the second anchor ring 6. The connector 4 can be provided with connector external threads on the outer peripheral surfaces of the first end and the second end of the connector 4, and is in threaded connection with the second end of the connecting sleeve 3 and in threaded connection with the first end of the second anchor ring 6 respectively.
The middle of the connector 4 can be further provided with a fixing ring protruding outwards, and two sides of the fixing ring are respectively abutted to the first end face of the second anchor ring 6 and the second end face of the connecting sleeve 3. The outer peripheral surfaces of the fixing ring and the second anchor ring 6 are respectively provided with a columnar groove hole 8, and the columnar groove holes 8 are used for installing screw threads and fixing the connector.
A second end steel strand accommodating cavity is formed between the second anchor ring 6 and the connector 4, and the inner side of the connector 4 is also provided with a step at the first end of the second end steel strand accommodating cavity to form a stepped hole. The second end steel strand wires holds the intracavity and still is provided with return spring 5, the first end butt of return spring 5 is on the step of connector 4 inboard, the second end butt of return spring 5 is used for right at the tip of second clamping piece 22 the extrusion force of first direction is applyed to second clamping piece 22, and is fixed second end steel strand wires 72.
The utility model provides a be used for post-cast strip in-band connection unbonded prestressing force stranded wire connector, as shown in fig. 1 fig. 2, the essential element includes: the anchor plate comprises a single-hole working anchor plate with external threads, connecting sleeves 3 with internal threads on two sides, connectors 4 with external threads on two sides, a second anchor ring 6 with internal threads, a second clamping piece 22 matched with the second anchor ring, a first clamping piece 21 matched with the first anchor plate 1 and a return spring 5. The first anchor plate, the second anchor ring and the connecting sleeve are all rotating bodies, and cylindrical slotted holes are formed in the peripheries of the second anchor ring and the connector and used for fixing the clamp when the screw thread is installed.
In order to match the connector provided by the application, the method for connecting the unbonded prestressed steel strand in the post-cast strip is also disclosed, and comprises the following steps:
and a preparation step, namely, before installation, carrying out a destructive test on the anchorage device system according to the standard, and reserving a proper length in a post-cast strip when the unbonded prestressed reinforcement is pre-buried.
Firstly, after the concrete strength on two sides of a post-cast strip meets the design requirement, firstly removing a plastic sheath with the length of 50mm at the end of a first end steel strand 71, and cleaning grease. Then, the first anchor plate 1 can be abutted against the surface of the side wall of the concrete structure on one side of the post-cast strip, the first anchor plate 1 is fixed on the periphery of the first end steel strand 71 in the post-cast strip, the first end steel strand 71 is subjected to prestress tensioning according to design requirements, and a first clamping piece 21 is arranged between the first anchor plate 1 and the first end steel strand 71 and used for anchoring the first end steel strand 71.
And secondly, performing anti-corrosion treatment on the structure, adopting epoxy coating prestressed steel strands, embedding sand grains on the surface of the coating when manufacturing a product in order to increase the bonding force between the epoxy coating and the concrete, and then installing a connecting sleeve 3 on the outer side of the first anchor plate 1.
And thirdly, fixing the second anchor ring 6 at the periphery of the second end steel strand 72 in the post-cast strip, arranging a second clamping piece 22 between the second anchor ring 6 and the second end steel strand 72, and anchoring the second end steel strand 72.
And fourthly, inserting a return spring 5 between the second clamping piece 22 and the connector 4, screwing the two ends of the connector 4 into the connecting sleeve 3 and the second anchor ring 6 for fixing and pressing the return spring 5, and connecting the return spring 5 and the second clamping piece 22 after connection is completed. Since the second end steel strand 72 does not have the tension force in the first direction at this time, the second clamping piece 22 cannot provide enough pressure to fix the second end steel strand 72 by itself, so that the return spring 5 applies the compression force in the first direction to the second clamping piece 22 to fix the second end steel strand 72.
And fifthly, sealing the post-cast strip concrete, and performing pre-stressed tensioning and anchoring on the far end of the second end steel strand 72 according to design requirements after the strength of the post-cast strip concrete meets the design requirements, wherein the connector provides a tensioning force in the first direction for the first end steel strand 71 and provides a tensioning force in the second direction for the second end steel strand 72. The distal end here refers to the end of the second end strand 72 that is not secured.
Therefore, the utility model discloses set up anchor plate, anchor ring respectively to the steel strand wires tip that needs to connect to utilize the spiral shell to detain the mode fixed anchor ring and with the connection structure between the anchor plate. The fixing mode can be used for conveniently operating according to the requirement of a designed tensioning sequence during construction, has the characteristics of high reliability and convenience in construction, and has lower requirement on the embedding precision of the steel strand in the length direction. And, because the utility model discloses an anchor slab and connection structure all seal in the sleeve, do not receive the interference of post-cast strip concrete placement, so the utility model provides an its reliability of connector is high. The anchor plate is fixed in the anchor plate hole, and the stress of the anchor plate is uniform and definite, so that the prestressed steel strand is not bent, and normal stress cannot be generated in concrete.
The above description is only for the embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes and modifications can be made, which all fall within the scope of the present invention.
Claims (8)
1. A connector for connecting unbonded prestressed steel strands in a post-cast strip, comprising:
the first anchor plate (1) is arranged on one side of the post-cast strip, the first anchor plate (1) is fixedly connected with a first end steel strand (71) in the post-cast strip, and a tension force in a first direction is applied to the first end steel strand;
the second anchor ring (6) is fixedly connected with a second end steel strand (72) in the post-cast strip and applies tension force in a second direction to the second end steel strand, and the second direction is opposite to the first direction;
and two ends of the connecting structure are fixedly connected with the first anchor plate (1) and the second anchor ring (6) respectively, and the connecting structure is used for keeping a first-direction tensile force applied to the first-end steel strand (71) in the first anchor plate (1) and keeping a second-direction tensile force applied to the second-end steel strand (72) in the second anchor ring (6).
2. The connector for connecting unbonded prestressed steel strands within a post-cast strip of claim 1, wherein said connecting structure comprises:
a connecting sleeve (3) having a first end fixedly connected to the outer periphery of the first anchor plate (1);
and the two ends of the connector (4) are respectively arranged in the connecting sleeve (3) and the second anchor ring (6) and are respectively fixedly connected with the inner peripheries of the connecting sleeve (3) and the second anchor ring (6).
3. The connector for connecting unbonded prestressed steel strands in post-cast strips as claimed in claim 2, wherein said first anchor plate (1) is a single hole working anchor plate,
the first end of the first end is abutted against the surface of the side wall of the concrete structure at one side of the post-cast strip,
the outer peripheral surface of the second end of the connecting sleeve is provided with an anchor plate external thread, and the second end of the first anchor plate (1) is in threaded connection with the first end of the connecting sleeve (3).
4. The connector for connecting unbonded prestressed steel strands in a post-cast strip according to claim 3, wherein the second anchor ring (6) has an inner anchor ring thread formed on the inner circumferential surface of the first end thereof, and the first end of the second anchor ring (6) is threadedly connected to the second end of the connector (4);
the outer peripheral surface of connector (4), its first end is provided with the connector external screw thread, the first end of connector (4) with the second end threaded connection of connecting sleeve (3).
5. The connector for connecting unbonded prestressed steel strands in a post-cast strip according to claim 4, wherein a fixing ring protruding outwards is further arranged in the middle of the connecting head (4), and two sides of the fixing ring abut against the first end face of the second anchor ring (6) and the second end face of the connecting sleeve (3), respectively.
6. The connector for connecting unbonded prestressed steel strands in a post-cast strip according to claim 5, wherein the outer circumferential surfaces of the fixing ring and the second anchor ring (6) are further provided with cylindrical slots (8), respectively, and the cylindrical slots (8) are used for installing screw fasteners to fix the connector.
7. The connector for connecting unbonded prestressed steel strands in a post-cast strip according to claim 1, wherein a first clamping piece (21) is further arranged in the first anchor plate (1), and the first clamping piece abuts between the outer periphery of the first end steel strand (71) and the mounting hole in the first anchor plate (1);
a second clamping piece (22) is further arranged in the second anchor ring (6) and is abutted between the periphery of the second end steel strand (72) and the mounting hole in the second anchor ring (6).
8. The connector for connecting unbonded prestressed steel strands in post-cast strip according to claim 7, wherein a second end steel strand accommodating cavity is formed between the second anchor ring (6) and the connector (4), a step is formed at the first end of the second end steel strand accommodating cavity at the inner side of the connector (4), a return spring (5) is further arranged in the second end steel strand accommodating cavity, the first end of the return spring (5) abuts against the step at the inner side of the connector (4), and the second end of the return spring (5) abuts against the end of the second clamping piece (22) and is used for applying extrusion force in the first direction to the second clamping piece (22) to fix the second end steel strand (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021913463.4U CN212376149U (en) | 2020-09-04 | 2020-09-04 | Connector for connecting unbonded prestressed steel strands in post-cast strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021913463.4U CN212376149U (en) | 2020-09-04 | 2020-09-04 | Connector for connecting unbonded prestressed steel strands in post-cast strip |
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| CN212376149U true CN212376149U (en) | 2021-01-19 |
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| CN202021913463.4U Active CN212376149U (en) | 2020-09-04 | 2020-09-04 | Connector for connecting unbonded prestressed steel strands in post-cast strip |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202233A (en) * | 2021-05-25 | 2021-08-03 | 四川公路桥梁建设集团有限公司 | Mechanical self-locking type connecting sleeve structure and construction method |
| CN113216521A (en) * | 2021-05-07 | 2021-08-06 | 河南省中创建筑工程有限公司 | Steel bar connection structure with prestress |
| CN114738024A (en) * | 2022-05-20 | 2022-07-12 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
-
2020
- 2020-09-04 CN CN202021913463.4U patent/CN212376149U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216521A (en) * | 2021-05-07 | 2021-08-06 | 河南省中创建筑工程有限公司 | Steel bar connection structure with prestress |
| CN113216521B (en) * | 2021-05-07 | 2024-02-13 | 河南省中创建筑工程有限公司 | Steel bar connection structure with prestressing force |
| CN113202233A (en) * | 2021-05-25 | 2021-08-03 | 四川公路桥梁建设集团有限公司 | Mechanical self-locking type connecting sleeve structure and construction method |
| CN114738024A (en) * | 2022-05-20 | 2022-07-12 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
| CN114738024B (en) * | 2022-05-20 | 2022-08-19 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
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