CN111794520B - Steel strand prestress tensioning device and method - Google Patents
Steel strand prestress tensioning device and method Download PDFInfo
- Publication number
- CN111794520B CN111794520B CN202010553928.8A CN202010553928A CN111794520B CN 111794520 B CN111794520 B CN 111794520B CN 202010553928 A CN202010553928 A CN 202010553928A CN 111794520 B CN111794520 B CN 111794520B
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- Prior art keywords
- limiting
- tool
- anchor
- backing ring
- jack
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
Abstract
The invention discloses a steel strand prestress tensioning device which comprises a working anchor, a working clamping piece, a limiting plate, a jack, a backing ring, a tool anchor and a tool clamping piece, wherein threaded holes are formed in a piston of the jack and the backing ring, the backing ring is connected to the threaded hole of the piston through a bolt, a bulge extends outwards from the backing ring, and a circular groove capable of accommodating the tool anchor is formed; and the backing ring is connected with a limiting assembly used for limiting the tool anchor on the circular groove when the piston retracts after the prestress tension is finished. The tool anchor and the tool clamping piece form relative movement in the retraction process of the piston of the jack through the limiting assembly, so that the tool clamping piece falls off from the tool anchor, and then the tool anchor is taken down from the steel strand to finish anchor withdrawal.
Description
Technical Field
The invention belongs to the technical field of construction, and particularly relates to a steel strand prestress tensioning device and a tensioning method.
Background
At present, in prestress construction, a method for tool anchor withdrawal is to coat lubricating grease on the surface of an anchor hole, coat a plastic film or lubricating grease on the surface of a clamping piece, and withdraw a jack in a method that a constructor hammers a tool anchor, shakes a steel strand and the like, but the method still has a high probability that the anchor cannot be withdrawn.
When the tool anchor still cannot be withdrawn by adopting methods such as hammering the tool anchor, shaking the steel strand and the like, a constructor can withdraw the anchor one by adopting a pre-prepared front clamping type jack and matching with a high-pressure oil pump and an anchor withdrawing tool; therefore, after the situation that the anchor can not be withdrawn occurs, the anchor withdrawing cost for processing each bundle of steel strands is about five minutes more, and because each steel strand is already applied with the prestress of 170kN, the anchor withdrawing has a great safety risk, and the steel strands are easily injured and even seriously threaten life.
Disclosure of Invention
The invention aims to provide a steel strand prestress tensioning device to overcome the technical problems.
The technical purpose of the invention is realized by the following technical scheme:
a steel strand prestress tensioning device comprises a working anchor, a working clamping piece, a limiting plate, a jack, a backing ring, a tool anchor and a tool clamping piece which are sequentially installed during prestress tensioning, wherein threaded holes are formed in a piston of the jack and the backing ring, the backing ring is connected to the threaded hole of the piston through a bolt, a protrusion extends outwards from the backing ring and forms a circular groove capable of accommodating the tool anchor, and the inner diameter of the circular groove is not smaller than the diameter of the tool anchor; and the backing ring is connected with a limiting assembly used for limiting the tool anchor on the circular groove when the piston retracts after the prestress tension is finished.
Furthermore, threaded holes are formed in the piston of the jack and the backing ring, and the backing ring is connected with the piston of the jack through a bolt.
Furthermore, the limiting assembly comprises at least two limiting claws which are distributed around the circumferential direction of the backing ring and movably connected to the backing ring and are approximately in an L-shaped structure, and the at least two limiting claws are matched together to limit the tool anchor on the circular groove.
Furthermore, the limiting claw is rotatably connected to the backing ring through a pin shaft.
Furthermore, a magnet capable of being adsorbed to the tool anchor is embedded in the limiting claw.
Further, the limiting claw comprises a connecting plate movably connected to the backing ring and extending along the axial direction of the backing ring and a limiting block vertically connected to the front end portion of the connecting plate, and the limiting block is located on the outer side of the tool anchor when the tool anchor is placed in the circular groove.
Another object of the present invention is to provide a tensioning method, which includes the steps of installing a backing ring on a piston of a jack, threading a steel strand, sequentially installing a work anchor, a work clamping piece, a limiting plate, the jack, a tool anchor and a tool clamping piece, starting to operate the jack to perform prestress tensioning, after the steel strand is tensioned, limiting the tool anchor by a limiting component on the backing ring to place the tool anchor on a circular groove, retracting the jack, releasing the tool clamping piece clamped on the steel strand from the tool anchor, taking down the tool anchor from the steel strand, and detaching the jack to complete prestress tensioning.
Has the advantages that:
in the conventional tensioning process, the jack, the backing ring and the tool anchor are arranged in a non-connected mode, after tensioning is finished, the tool anchor needs to be moved down from the steel strand, the tool anchor can be taken down by withdrawing the tool clamping piece from the tool anchor in the normal anchor withdrawing process, and the tool clamping piece can not be separated from the tool anchor even if a hammering mode is adopted due to the tensioning process in the actual process.
The applicant finds that the acting force caused by retraction of the piston of the jack can separate the tool anchor from the tool clamping piece when tensioning is finished based on the problem of anchor withdrawal in the practical process, and the aim cannot be fulfilled only by fixing the tool anchor and the jack because the piston of the jack can rotate in the tensioning process;
on the basis of the realization of the structure, the pin shaft type implementation mode is provided for facilitating the taking off of the tool anchor after the tool clamping piece is separated from the tool anchor, and for facilitating the tensioning of the front backing ring and the jack, the threading of the steel strand and the connection of the steel strand and the tool anchor;
the pin shaft type is characterized in that a limiting claw for limiting the tool anchor is rotatably connected to the backing ring through a pin shaft, and the limiting claw can be opened when the limiting is not performed, so that the tool anchor can be conveniently connected to the steel strand, and the process that the steel strand needs to be aligned with a through hole in the tool anchor when the tool anchor is fixed with the jack is reduced; meanwhile, the limiting claw is adsorbed to the tool anchor after tensioning is finished by matching with the magnet, so that the limiting claw is fixed; and the tool anchor can be conveniently taken down from the steel strand after the tool clamping piece falls off.
According to the invention, the piston of the jack is provided with the threaded hole, the backing ring is improved, other tensioning devices (tool anchors, tool clamping pieces and the like) are not required to be modified, the improvement mode is simple, the cost is low, and the practicability is high.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the tool anchor, backing ring and stop assembly of the present invention;
in the figure: 1. a working anchor; 2. a working clamping piece; 3. a limiting plate; 4. a jack; 5. a backing ring; 51. a protrusion; 6. a tool anchor; 7. a tool clamping piece; 8. a limiting component; 81. a limiting claw; 811. a connecting plate; 812. a limiting block; 82. and (7) a pin shaft.
Detailed Description
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "front", "rear", and the like, indicate orientations or positional relationships only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the designated device or structure must have a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the steel strand prestress tensioning device comprises a working anchor, a working clamping piece, a limiting plate, a jack, a backing ring, a tool anchor and a tool clamping piece, wherein the working anchor, the working clamping piece, the limiting plate and the tool clamping piece are all conventional equipment, and the tool clamping piece is of a three-piece structure.
The present invention achieves its objectives in the improvement of jacks and backing rings and the use of a spacing assembly.
As shown in fig. 2, firstly, the backing ring and the jack are different from the conventional one, the backing ring needs to be fixedly connected with a piston of the jack, and the limiting component is connected to the backing ring; meanwhile, the backing ring is provided with a protrusion extending outwards to form a circular groove capable of accommodating the tool anchor, the length of the protrusion extending outwards is preferably smaller than the thickness of the tool anchor, the inner diameter of the circular groove is designed, and the inner diameter of the circular groove needs to be larger than the diameter of the tool anchor.
Secondly, the piston and the backing ring of the jack are improved, and threaded holes are processed in the piston and the backing ring of the jack, so that the backing ring is fixedly connected with the piston of the jack through a bolt.
Finally, the structure of the limiting assembly is designed, as shown in fig. 2, the limiting assembly comprises at least two limiting claws which are distributed around the circumference of the backing ring and are movably connected to the backing ring, each limiting claw comprises a connecting plate movably connected to the backing ring and a limiting block vertically connected to the front end of the connecting plate, when the tool anchor is placed in the circular groove, the limiting blocks are arranged on the outer side of the tool anchor, a certain gap is formed between the limiting blocks and the tool anchor, and when the at least two limiting claws are folded, the tool anchor is limited on the circular groove.
Each connecting plate is rotatably connected to the backing ring through a pin shaft, so that the connecting plates can rotate along the pin shaft, the connecting plates are moved from a state parallel to the axial direction of the backing ring to a state perpendicular to the axial direction of the backing ring, and the opening and closing of at least two limiting claws are realized through the pin shaft; when the tool anchor is opened, the tool anchor is not limited, when the steel strand passes through the circular hole of the backing ring during assembly, the tool anchor is connected to the steel strand, then the steel strand directly moves into the circular groove of the backing ring, tensioning can be started at the moment, after the prestress tensioning is completed, the set limiting claw rotates to form closure on the backing ring, and the limiting block is located on the outer side of the tool anchor so as to limit the tool anchor.
In the above, after the tool anchor is limited, the limiting claw can rotate, so that the tool anchor cannot be limited fixedly, and a magnet capable of being attracted to the tool anchor is embedded in the limiting claw, so that the limiting claw and the tool anchor can be attracted and fixed by the magnet after the limiting claw is limited; the magnet can be arranged on the connecting plate and can also be connected to the limiting block.
Further, in order to facilitate the limiting of the limiting claw on the tool anchor to be maximized, the tool anchor and the limiting claw can be further improved, the limiting block in the limiting claw is of an L-shaped structure, one side of the limiting block is perpendicularly connected to the connecting plate, the other side of the limiting block is parallel to the connecting plate, a certain gap exists between the limiting block and the connecting plate, a hook portion groove is formed, the tool anchor is processed, a circular plate concentric with the tool anchor extends towards the limiting block on the tool anchor, when the piston retracts, the backing plate drives the limiting claw to retract, and the hook portion groove is just clamped on the circular plate at the moment, so that the reinforcing limiting is achieved.
Tensioning and anchor withdrawing processes:
firstly, the backing ring is connected to the jack, the limiting component is adjusted to a state when the limiting component is not limited (namely, the limiting claw is opened through the pin shaft), then the steel strand is strung according to the conventional method, the working anchor, the working clamping piece, the limiting plate, the jack, the tool anchor and the tool clamping piece are sequentially installed, the tool anchor is connected to the steel strand and moves into the circular groove, and tensioning can be started.
After tensioning is finished, the limiting claw is rotated before the piston of the jack retracts, the tool anchor is limited on the circular groove under the action of the limiting claw, the tool anchor retracts synchronously with the backing ring and the piston in the retraction process of the piston, the tool clamping piece on the steel strand (which is in a fixed state with the tool anchor at the moment) moves relative to the tool anchor, so that the tool clamping piece can fall off from the tool anchor and directly fall off, at the moment, the limiting claw is opened, the tool anchor can be taken down from the steel strand, and anchor withdrawal is finished.
In order to make the objects, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the above specific embodiments, which are only used for describing the present invention, and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (2)
1. A steel strand prestress tensioning device comprises a working anchor (1), a working clamping piece (2), a limiting plate (3), a jack (4), a tool anchor (6) and a tool clamping piece (7) which are sequentially installed during prestress tensioning;
the jack is characterized by further comprising a backing ring (5), wherein threaded holes are formed in the piston of the jack and the backing ring, and the backing ring is connected to the threaded hole of the piston through a bolt;
a bulge (51) extends outwards from the backing ring and forms a circular groove for accommodating the tool anchor;
a limiting component (8) used for limiting the tool anchor on the circular groove when the piston retracts after the prestress tension is finished is connected to the backing ring;
the limiting assembly comprises at least two limiting claws (81) which are distributed around the circumferential direction of the backing ring and movably connected to the backing ring, the limiting claws are respectively of an L-shaped structure, magnets which can be adsorbed to the tool anchor are embedded on the limiting claws, and the at least two limiting claws are matched together to limit the tool anchor on the circular groove;
the limiting claw is rotatably connected to the backing ring through a pin shaft (82), the limiting claw comprises a connecting plate (811) movably connected to the backing ring and a limiting block (812) vertically connected to the front end portion of the connecting plate, and the limiting block is located on the outer side of the tool anchor when the tool anchor is placed in the circular groove.
2. A tensioning method of a steel strand prestress tensioning device according to claim 1, characterized by comprising the following steps of installing a backing ring on a piston of a jack, threading the steel strand, sequentially installing a working anchor, a working clamping piece, a limiting plate, the jack, a tool anchor and a tool clamping piece, starting the operation of the jack to perform prestress tensioning, after the steel strand is tensioned, limiting the tool anchor by a limiting assembly on the backing ring to place the tool anchor on a circular groove, starting the retraction of the jack, enabling the tool clamping piece clamped on the steel strand to fall off from the tool anchor, taking the tool anchor off from the steel strand, detaching the jack and completing the prestress tensioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553928.8A CN111794520B (en) | 2020-06-17 | 2020-06-17 | Steel strand prestress tensioning device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553928.8A CN111794520B (en) | 2020-06-17 | 2020-06-17 | Steel strand prestress tensioning device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111794520A CN111794520A (en) | 2020-10-20 |
| CN111794520B true CN111794520B (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010553928.8A Active CN111794520B (en) | 2020-06-17 | 2020-06-17 | Steel strand prestress tensioning device and method |
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| CN (1) | CN111794520B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113652965B (en) * | 2021-06-23 | 2023-04-14 | 中铁建工集团第二建设有限公司 | Stay cable space positioning tensioning construction system and tensioning construction method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH456906A (en) * | 1965-09-16 | 1968-05-31 | Losinger Ag | Device for tensioning and anchoring several tendons that together form a tensioning cable |
| KR100377633B1 (en) * | 2001-02-22 | 2003-03-29 | 신종덕 | method and apparatus for removing a steel wire cable from an anchor for preventing side wall collapse |
| CN102674196A (en) * | 2012-06-08 | 2012-09-19 | 柳州泰姆预应力机械有限公司 | Split front-clamping type tensioning jack and construction method thereof |
| CN104649180B (en) * | 2014-06-24 | 2017-07-04 | 柳州市威尔姆预应力有限公司 | Inner blocking type stretch-draw jack and its construction method |
| CN109853392B (en) * | 2019-02-21 | 2021-03-23 | 中冶交通建设集团有限公司 | Magnetic anchor releaser, anchor releasing equipment and using method thereof |
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2020
- 2020-06-17 CN CN202010553928.8A patent/CN111794520B/en active Active
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| CN111794520A (en) | 2020-10-20 |
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