CN213204998U - Anchor withdrawing structure for prestress tensioning - Google Patents
Anchor withdrawing structure for prestress tensioning Download PDFInfo
- Publication number
- CN213204998U CN213204998U CN202021130020.8U CN202021130020U CN213204998U CN 213204998 U CN213204998 U CN 213204998U CN 202021130020 U CN202021130020 U CN 202021130020U CN 213204998 U CN213204998 U CN 213204998U
- Authority
- CN
- China
- Prior art keywords
- anchor
- backing ring
- tool
- limiting
- circular groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses an anchor withdrawing structure for prestress tensioning, which is connected on a jack for prestress tensioning and comprises a tool anchor, a tool clamping piece, a backing ring and a limiting claw; the backing ring is fixedly connected to a piston of the jack, and a bulge for forming a circular groove outside the backing ring extends from the backing ring; the limiting claws are of an L-shaped structure, are provided with at least two movably connected to the backing ring and are distributed around the circumference of the backing ring; the tool anchor is arranged on the circular groove during prestress tensioning, at least two limiting claws are closed when the piston retracts, the tool anchor is limited on the circular groove, and the inner diameter of the circular groove is not smaller than the diameter of the tool anchor. The utility model discloses a spacing claw contracts the process at the piston of jack and makes instrument anchor and instrument clamping piece form relative movement to this makes the instrument clamping piece drop from the instrument anchor, takes off the instrument anchor from the steel strand wires again, accomplishes and moves back the anchor.
Description
Technical Field
The utility model belongs to the technical field of the construction, concretely relates to prestressed tension moves back anchor structure.
Background
At present, in the prestress construction, the method adopted for withdrawing the tool anchor is to coat lubricating grease on the surface of an anchor hole, wrap a plastic film or lubricating grease on the surface of a clamping piece, and withdraw the anchor by adopting methods of hammering the tool anchor, shaking a steel strand and the like by a constructor after a jack is withdrawn, but the methods still have the condition that the anchor can not be withdrawn at a high probability; after the situation that the anchor can not be withdrawn occurs, the anchor withdrawing of each bundle of steel strands needs more than five minutes if the anchor withdrawing is matched with the front clamping type jack, and because each steel strand is already applied with 170kN prestress, the anchor withdrawing has great safety risk, and the steel strands are easily injured and even seriously threaten life.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prestressing force stretch-draw moves back anchor structure to overcome above-mentioned technical problem.
The above technical purpose of the present invention can be achieved by the following technical solutions:
an anchor withdrawing structure for prestress tensioning is connected to a jack for prestress tensioning and is characterized by comprising a tool anchor and a tool clamping piece;
the backing ring is fixedly connected to the piston of the jack, and a bulge for forming a circular groove outside the backing ring extends outwards in the direction opposite to the direction of the jack on the backing ring;
the limiting claws are roughly of L-shaped structures, are provided with at least two cushion rings movably connected to the cushion rings and are distributed around the circumferential direction of the cushion rings;
when the prestress is tensioned, the tool anchor is placed on the circular groove, and when the piston is retracted, at least two limiting claws are closed to limit the tool anchor on the circular groove;
after the limiting claw is closed, a gap exists between the part, limiting the tool anchor, of the limiting claw and the tool anchor, and the inner diameter of the circular groove is not smaller than the diameter of the tool anchor.
Furthermore, the limiting claw is rotatably connected to the backing ring through a pin shaft.
Furthermore, a magnet used for being adsorbed by the tool anchor is embedded on the limiting claw.
Furthermore, the limiting claw comprises a connecting plate movably connected to 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 after the limiting claw is folded.
Has the advantages that:
the utility model has the advantages that the cushion ring is connected on the piston of the jack, the limiting claw is connected on the cushion ring, and the limiting claw limits the tool anchor, so that the tool anchor and the jack are regarded as an integrated structure in the process of retracting the piston, and the tool clamping piece can automatically withdraw from the taper hole of the tool anchor and fall off by means of the force of the piston returning;
meanwhile, the limiting claw is connected to the backing ring in a rotatable mode and can be opened and closed on the backing ring, so that the tool anchor can be conveniently installed before tensioning and can be conveniently withdrawn after the clamping piece of the tool is withdrawn.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1. a tool anchor; 2. a backing ring; 3. a protrusion; 4. a limiting claw; 41. a connecting plate; 42. a limiting block; 5. 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 device or structure referred to must have a particular orientation and therefore 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 figure 1, a prestressing force stretch-draw move back anchor structure, including instrument anchor, instrument clamping piece, backing ring and spacing claw, wherein, instrument anchor and instrument clamping piece are conventional equipment, the instrument clamping piece is three formula structures.
The utility model discloses realize its aim at to the improvement of backing ring and the use of spacing claw.
Wherein, at first the backing ring improves, is different from conventional backing ring and jack, the utility model discloses in connect the backing ring on the piston of jack processing threaded hole on the backing ring, connect the backing ring on the piston through the bolt.
Secondly, a bulge extends outwards from the backing ring to form a circular groove capable of accommodating the tool anchor, the extension length of the bulge is smaller than the thickness of the tool anchor, and the inner diameter of the circular groove is designed and is not smaller than the diameter of the tool anchor.
As shown in fig. 1, the limiting claws are substantially in an L-shaped structure, and are provided with at least two limiting claws which are movably connected to the backing ring and distributed around the circumference of the backing ring; therefore, each limiting claw comprises a connecting plate movably connected to the backing ring and a limiting block vertically connected to the front end part of the connecting plate; each connecting plate is rotatably connected to the backing ring through a pin shaft, and therefore the connecting plates can rotate along the pin shafts, the connecting plates are made to move 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 opening and closing of the at least two limiting claws are achieved through the pin shafts.
Therefore, when the piston retracts, the tool anchor can be limited on the circular groove by the folding of the at least two limiting claws, and a gap exists between the limiting stopper and the tool anchor after the limiting claws are folded, so that the limiting claws can rotate conveniently.
When the limiting claw is opened, the tool anchor is not limited, when a steel strand passes through the circular hole of the backing ring during assembly, the tool anchor is connected to the steel strand and then moves into the circular groove of the backing ring, tensioning is started at the moment, and after tensioning is completed, the limiting claw is rotated by external force to realize folding, and the limiting of the tool anchor is realized before the piston retracts.
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:
adjusting the limiting claw to an open state, connecting the backing ring on the jack, connecting the tool anchor on the steel strand and moving the tool anchor into the circular groove, installing the tool clamping piece, and starting prestress tensioning.
After tensioning is finished, the piston of the jack retracts, the tool anchor, the backing ring and the piston retract synchronously and oppositely under the action of the limiting claw, the tool clamping piece on the steel strand (connected to the taper hole of the tool anchor at the moment) moves relative to the tool anchor, the tool clamping piece falls off from the taper hole of the tool anchor and directly falls off, 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 purpose, technical solution and advantages of the present invention more concise and clear, the present invention is described with the above embodiments, which are only used for describing the present invention, and can not be understood as a limitation to 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 invention should be subject to the appended claims.
Claims (4)
1. An anchor withdrawing structure for prestress tensioning is connected to a jack for prestress tensioning and is characterized by comprising a tool anchor (1) and a tool clamping piece;
the backing ring (2) is fixedly connected to a piston of the jack, a bulge (3) used for forming a circular groove outside the backing ring is extended outwards in the direction opposite to the direction of the jack on the backing ring, and the inner diameter of the circular groove is not smaller than the diameter of the tool anchor;
the limiting claws (4) are roughly of L-shaped structures, are provided with at least two cushion rings movably connected to the cushion rings and are distributed around the circumferential direction of the cushion rings;
when the piston retracts, at least two limiting claws are closed to limit the tool anchor on the circular groove.
2. The prestressed tensioning anchor withdrawing structure as claimed in claim 1, wherein said limiting jaw is rotatably connected to said backing ring by a pin (5).
3. The prestressed tensioning anchor withdrawing structure as claimed in claim 1, wherein a magnet for attracting the tool anchor is embedded in the limiting claw.
4. The prestressed tension withdrawing structure as claimed in claim 1, wherein said holding jaw comprises a connecting plate (41) movably connected to said backing ring and a holding block (42) vertically connected to a front end portion of said connecting plate, said holding jaw being located outside said tool anchor after being closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021130020.8U CN213204998U (en) | 2020-06-17 | 2020-06-17 | Anchor withdrawing structure for prestress tensioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021130020.8U CN213204998U (en) | 2020-06-17 | 2020-06-17 | Anchor withdrawing structure for prestress tensioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213204998U true CN213204998U (en) | 2021-05-14 |
Family
ID=75831024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021130020.8U Active CN213204998U (en) | 2020-06-17 | 2020-06-17 | Anchor withdrawing structure for prestress tensioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213204998U (en) |
-
2020
- 2020-06-17 CN CN202021130020.8U patent/CN213204998U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213204998U (en) | Anchor withdrawing structure for prestress tensioning | |
| CN111044353B (en) | Split Hopkinson bar tension-torsion load composite loading device and using method thereof | |
| CN111794520B (en) | Steel strand prestress tensioning device and method | |
| CN113390712B (en) | Impact tensile fatigue test fixture for round bar test piece | |
| KR101717734B1 (en) | Caulking method for preventing piston of hydraulic/pneumatic cylinder from being loosened | |
| CN208981794U (en) | Prestress anchorage cable limiting device | |
| CN200956388Y (en) | Winding pin mechnaism for cell winding machine | |
| CN213296340U (en) | Device for anchor cable tensioning construction | |
| CN105806702A (en) | Clamp used for horizontal relaxation testing machine of steel strands | |
| CN213204999U (en) | Anchor withdrawing structure of prestressed tool anchor | |
| CN201291248Y (en) | Pay-off drum | |
| CN113023546B (en) | Precast pile hanging device and method | |
| CN111044352A (en) | Separated Hopkinson bar pressure and torsion load composite loading device and use method thereof | |
| CN113501459A (en) | Front-clamping porous through jack structure | |
| CN110318546A (en) | Prestress anchorage cable tensioning system and prestress anchorage cable method for stretching | |
| CN210507437U (en) | Recoverable anchor cable | |
| CN220932600U (en) | Universal testing machine | |
| CN217581293U (en) | Secondary tensioning and releasing device for prestressed steel strands | |
| CN218926064U (en) | Steel wire rope vibration isolator winding die | |
| CN216072868U (en) | Front-clamping through type tensioning jack | |
| CN210439703U (en) | Prestressed steel strand anchor withdrawing device and prestressed steel strand anchor withdrawing equipment | |
| CN219715018U (en) | Device for protecting fixture of rotary bending fatigue equipment | |
| CN221073692U (en) | Detachable stop lever | |
| CN113865978B (en) | Stretching/creeping clamp suitable for radioactive arc-shaped sample | |
| CN210427321U (en) | Fiber-concrete bonding force test device based on in-situ stretching table |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |