CN214942552U - Low-retraction clamping piece tensioning system - Google Patents
Low-retraction clamping piece tensioning system Download PDFInfo
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- CN214942552U CN214942552U CN202120707085.2U CN202120707085U CN214942552U CN 214942552 U CN214942552 U CN 214942552U CN 202120707085 U CN202120707085 U CN 202120707085U CN 214942552 U CN214942552 U CN 214942552U
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Abstract
The utility model discloses a low-retraction clamping piece tensioning system, which comprises an anchor backing plate, an anchor plate, a clamping piece, a back pressure limiting device and a jack tensioning device, wherein the anchor backing plate, the anchor plate, the clamping piece, the back pressure limiting device and the jack tensioning device are respectively provided with through holes for the steel strand to pass through, and are installed in a superposition way that the through holes are in one-to-one correspondence in sequence from bottom to top; the anchor plate is arranged at the top of the anchor backing plate, the clamping piece is inserted at the top of the anchor plate, and the fixing frame of the back pressure limiting device is arranged at the upper part of the anchor plate and used for limiting the vertical displacement of the clamping piece; the jack tensioning device is arranged at the top of the back pressure limiting device and used for upwards tensioning the steel strand. The utility model can carry out back pressure on the clamping sheet after tensioning to enable the clamping sheet to return to the original position, effectively control the retraction amount of the steel strand between 0 and 0.5mm, greatly reduce the anchoring loss and ensure the tensioning quality; and the effect can be achieved by only one-time tensioning, and the construction efficiency is effectively improved.
Description
Technical Field
The utility model relates to a prestressing force stretch-draw technical field especially relates to a low clamping piece stretch-draw system that contracts.
Background
Prestressing force tensioning adds the pulling force in advance in the component for it bears compressive stress to be applyed prestressing force tensioning component, and then produces certain deformation, deals with the load that structure itself received, including the load of component self weight, wind load, snow load, earthquake load effect etc. wide application in bridge construction, railway structure and building structure.
The traditional prestress tension method is to adopt a feed-through jack and a clamping piece anchorage device to tension a steel strand until the tension force is reached. In the stretching process, the steel strand is stressed to elongate and deform, the clamping piece is driven to move back to the position of the limiting piece, the limiting piece blocks the clamping piece to move outwards, and the steel strand continues to elongate until the tensile force is reached; and then the jack is jacked back, the steel strand is elastically deformed and retracted to drive the clamping piece to retract into the anchorage device, and the steel strand is anchored by the clamping piece to complete tensioning and fixing. However, when the clamping piece and the steel strand retract, a certain tension value is lost, so that the control of the retraction amount is very important.
In order to control the retraction amount, the prior art provides a low-retraction anchor and a method for secondary tensioning through the anchor, the principle is that after the traditional tensioning method is used for tensioning in place, a pressure-bearing sleeve is sleeved on the anchor for secondary tensioning, the lost tension value is complemented through secondary tensioning, in the tensioning process, the whole anchor moves along with the extension of a steel strand, a gap is formed between the anchor and an anchor backing plate, and then a pressure-bearing nut of the pressure-bearing sleeve is screwed down through downward rotation so as to fill the gap between the anchor and the anchor backing plate; at the moment, the jack returns, because the anchorage device and the steel strand move together, no gap exists between the steel strand and the anchorage device, the gap between the anchorage device and the anchor backing plate is filled by the pressure-bearing nut, and no gap exists between the anchorage device and the anchor backing plate, so that the anchoring retraction amount is greatly reduced, the loss of the tension value is avoided, and the tension quality is ensured.
However, the traditional tensioning method is adopted for tensioning in place, then the anchorage device is replaced, and then the tensioning is carried out in a secondary tensioning mode, so that the operation is complicated, and the working efficiency is low; and because the ground tackle moves with the steel strand wires together during secondary tensioning, if the anchor backing plate has an inclination angle, when the pressure-bearing nut is screwed down after secondary tensioning, the pressure-bearing nut and the anchor backing plate can not be completely attached, after the jack is jacked back, the tension force value compensated is slightly influenced, the tensioning effect is poor, the periphery of the ground tackle is unevenly stressed due to the heavy weight, threads on the ground tackle and the pressure-bearing nut are damaged, and secondary tensioning failure is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a low-retraction clip tensioning system, which can control the retraction amount and ensure the tensioning effect, and improve the construction efficiency.
The utility model discloses a following technical scheme realizes:
a low-retraction clamping piece tensioning system comprises an anchor backing plate, an anchor plate, a clamping piece, a back pressure limiting device and a jack tensioning device, wherein the anchor backing plate, the anchor plate, the clamping piece, the back pressure limiting device and the jack tensioning device are respectively provided with through holes for penetrating steel strands, and are sequentially arranged from bottom to top in a one-to-one correspondence mode; the anchor plate is arranged at the top of the anchor backing plate, the clamping piece is inserted at the top of the anchor plate, and the fixing frame of the back pressure limiting device is arranged at the upper part of the anchor plate and used for limiting the vertical displacement of the clamping piece; the jack tensioning device is arranged at the top of the back pressure limiting device and used for upwards tensioning the steel strand.
In one embodiment, the back pressure limiting device comprises a limiting piece, a back pressure plate and a pushing mechanism, wherein the limiting piece is fixed on the upper part of the anchor plate; the back pressure plate is slidably matched in the limiting piece and is abutted against the top surface of the clamping piece; the pushing mechanism is arranged between the limiting part and the back pressure plate and used for pressing the back pressure plate downwards towards the clamping piece.
In one embodiment, the pushing mechanism is a cylinder or a hydraulic cylinder, and two acting ends of the pushing mechanism respectively abut against the lower side surface of the top of the limiting member and the upper side surface of the counter plate.
In one embodiment, a first containing groove is formed in the inner side of the limiting member, and the back pressure plate is in sliding fit with the first containing groove; the first containing groove is also provided with a second containing groove, and the pushing mechanism is arranged in the second containing groove.
In one embodiment, the height of the pushing mechanism when the pushing mechanism is contracted is equal to or lower than the height of the second containing groove.
In one embodiment, a plurality of vertically arranged sliding grooves are formed in the limiting part at intervals in the circumferential direction, protruding blocks are arranged on the counter plate corresponding to the sliding grooves in the circumferential direction, and the protruding blocks are slidably matched in the sliding grooves; the pushing mechanism is arranged between the convex block and the sliding groove, and two action ends of the pushing mechanism are respectively abutted against the lower side surface of the top of the sliding groove and the upper side surface of the convex block.
In one embodiment, the lug extends outwards from the sliding groove along the circumferential direction of the counter plate; a convex edge is arranged on the outer side of the limiting piece and corresponds to the upper part of the sliding groove and outwards arranged along the circumferential direction of the limiting piece; the pushing mechanism is arranged between the convex block and the convex edge, and two action ends of the pushing mechanism are respectively abutted against the lower side surface of the convex edge and the upper side surface of the convex block.
In one embodiment, the pushing mechanism is provided in plurality, and the plurality of pushing mechanisms are uniformly distributed in a ring shape in the horizontal direction.
In one embodiment, the anchor plate is arranged on the top of the anchor backing plate in an abutting mode; the limiting piece is detachably fixed on the upper part of the anchor plate in a threaded connection mode; the jack tensioning device is arranged at the top of the back pressure limiting device in an abutting mode.
Compared with the prior art, the technical scheme of the utility model following advantage and beneficial effect have at least:
the utility model can control the vertical displacement of the clamping piece through the back pressure limiting device, and can back pressure the clamping piece after tensioning to return the clamping piece, so that no expansion gap exists between the clamping piece and the anchor plate, and effectively control the retraction amount of the steel strand between 0 and 0.5mm (considering the thread clearance), thereby greatly reducing the anchoring loss and ensuring the tensioning quality; and the utility model discloses set up jack tensioning equipment in back pressure stop device's top, compress tightly back pressure stop device and anchor slab downwards on the anchor backing plate, avoided the vertical removal of back pressure stop device and anchor slab, only can reach above-mentioned effect through stretch-draw once, improved the efficiency of construction effectively.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a low retraction clip tensioning system according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
fig. 3 is a schematic structural diagram of another low retraction clip tensioning system according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view at B of FIG. 3;
fig. 5 is a schematic plan view of a counter plate of another low retraction clip tensioning system according to an embodiment of the present invention.
Icon: 1-anchor backing plate, 2-anchor plate, 3-clamping piece, 4-back pressure limiting device, 41-limiting piece, 411-first containing groove, 412-second containing groove, 413-sliding groove, 414-convex edge, 42-back pressure plate, 421-lug, 43-pushing mechanism, 5-jack tensioning device, 6-steel strand and 7-through hole.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, a low-retraction clip tensioning system will be described more clearly and completely with reference to the accompanying drawings in embodiments of the present invention. The preferred embodiments of the low retraction clip tensioning system are shown in the drawings, however, the low retraction clip tensioning system may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms "central," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, when used in reference to a particular orientation or positional relationship, are used for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In the description of the present invention, it should be further noted that the terms "disposed," "mounted," "connected," and "connected" used herein should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, 2 and 5, an embodiment of the present invention provides a low-retraction clamping piece 3 tensioning system, which includes an anchor backing plate 1, an anchor plate 2, a clamping piece 3, a back pressure limiting device 4 and a jack tensioning device 5, wherein the anchor backing plate 1, the anchor plate 2, the clamping piece 3, the back pressure limiting device 4 and the jack tensioning device 5 are respectively provided with through holes 7 for passing steel strands 6, and are stacked and installed in a one-to-one correspondence manner of the through holes 7 from bottom to top in sequence, so that the steel strands 6 can be reasonably passed therethrough; in the embodiment, the anchor plate 2 is arranged at the top of the anchor backing plate 1 in an abutting mode, the clamping piece 3 is inserted at the top of the anchor plate 2 corresponding to the through hole 7 on the anchor plate 2, the back pressure limiting device 4 is fixedly arranged at the upper part of the anchor plate 2 and can carry out back pressure on the clamping piece 3 after tensioning to enable the clamping piece 3 to return to the original position, no telescopic gap exists between the clamping piece 3 and the anchor plate 2, and the retraction amount of the steel strand 6 is effectively controlled to be 0-0.5mm (considering the thread gap); a jack tensioning equipment 5 for upwards tensioning steel strand wires 6 sets up in the top of back pressure stop device 4 with the mode of butt to compress tightly back pressure stop device 4 and anchor slab 2 downwards on anchor backing plate 1, avoided the vertical migration of back pressure stop device 4 and anchor slab 2, only can reach the effect that reduces the anchor loss, guarantees the tensioning quality through a stretch-draw, and improved the efficiency of construction effectively.
Specifically, as shown in fig. 2, the back pressure limiting device 4 includes a limiting member 41, a back pressure plate 42 and a pushing mechanism 43, the limiting member 41 is in a reversed barrel shape, the inner side of the limiting member is provided with a screw thread, and the limiting member 41 is detachably fixed on the upper part of the outer side of the anchor plate 2 in a screw thread connection manner; when the limiting piece 41 is fixed on the upper part of the anchor plate 2, a space for the clamping piece 3 to move exists between the top of the limiting piece 41 and the anchor plate 2, and the back pressure plate 42 is in sliding fit with the limiting piece 41 and is abutted against the top surface of the clamping piece 3; the pushing mechanism 43 is disposed between the limiting member 41 and the counter plate 42 for pushing the counter plate 42 toward the clip 3. During tensioning, the jack tensioning device 5 drives the steel strand 6 to be stretched upwards, drives the clamping piece 3 to slightly separate from the anchor plate 2, so that a movable gap is formed between the clamping piece 3 and the steel strand 6, abrasion between the clamping piece 3 and the steel strand 6 is avoided when the steel strand 6 is tensioned, but the clamping piece 3 is not completely separated from the anchor plate 2 under the limitation of the limiting piece 41 and the counter-pressure plate 42; after the steel strand is stretched in place, the pushing mechanism 43 is started to press the counter pressing plate 42 downwards towards the clamping piece 3, so that the clamping piece 3 moves downwards to return to the original position and the steel strand 6 is meshed, at the moment, the jack is jacked back, the clamping piece 3 is tightly meshed with the steel strand 6, the clamping piece 3 has no retraction stroke, the steel strand 6 also has no retraction stroke, the tension value is not lost, and the stretching quality is further ensured.
Further, as shown in fig. 1 and fig. 2, the pushing mechanism 43 may be disposed inside the limiting member 41, in this embodiment, a first accommodating slot 411 is disposed inside the limiting member 41, and the counter plate 42 is slidably fitted in the first accommodating slot 411; a second containing groove 412 is also arranged in the first containing groove 411, and the pushing mechanism 43 is arranged in the second containing groove 412; it can be understood that the pushing mechanism 43 is a pneumatic cylinder or a hydraulic cylinder, two acting ends of the pushing mechanism respectively abut against the lower side surface of the top of the limiting member 41 and the upper side surface of the back pressure plate 42, and a channel is opened outward on the sidewall of the second accommodating groove 412 to connect an inflator or a hydraulic pump.
Further, as shown in fig. 1, a plurality of pushing mechanisms 43 are provided, and the plurality of pushing mechanisms 43 are uniformly arranged in a ring shape in the horizontal direction, so as to uniformly apply a pushing force to the back pressure plate 42, so that the force is uniformly applied, and the situation that the normal returning of the clamping piece 3 is influenced by the inclination is avoided.
Further, as shown in fig. 1 and fig. 2, the height of the pushing mechanism 43 during the expansion and contraction is equal to or lower than the height of the second accommodating groove 412, so that the back pressure plate 42 is pressed by the bottom of the first accommodating groove 411 during the tensioning, the stress of the back pressure limiting device 4 is applied to both the limiting member 41 and the back pressure plate 42, and the pushing mechanism 43 is not stressed at the first time and only acts during the pushing.
Further, in other embodiments, the pushing mechanism 43 may be disposed outside the limiting member 41, so as to facilitate installation and operation of the pushing mechanism 43. Specifically, as shown in fig. 3 and 4, a plurality of vertically arranged sliding grooves 413 are formed at intervals in the circumferential direction of the limiting member 41, a protrusion 421 is arranged on the counter pressure plate 42 corresponding to the sliding groove 413 in the circumferential direction, and the protrusion 421 is slidably fitted in the sliding groove 413; the pushing mechanism 43 can be disposed between the protrusion 421 and the sliding groove 413, and two acting ends thereof respectively abut against the lower side surface of the top of the sliding groove 413 and the upper side surface of the protrusion 421, so that the reaction force applied to the protrusion 421 and the sliding groove 413 pushes the reaction plate 42 downward toward the clip 3, thereby moving the clip 3 downward to return to the original position.
Likewise, as shown in fig. 3 and 4, the projection 421 may also be extended outward from the sliding groove 413 in the circumferential direction of the back pressure plate 42; on the outer side of the stopper 41, a convex edge 414 is provided along the circumferential direction of the stopper 41 and outward above the sliding groove 413; the pushing mechanism 43 is disposed between the protrusion 421 and the ledge 414, and two action ends thereof respectively abut against the lower side surface of the ledge 414 and the upper side surface of the protrusion 421, and the reaction force applied by the protrusion 421 and the ledge 414 pushes the counter-pressure plate 42 downward toward the clip 3, so that the clip 3 moves downward and returns to its original position.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A low-retraction clamping piece tensioning system is characterized by comprising an anchor backing plate, an anchor plate, a clamping piece, a back pressure limiting device and a jack tensioning device, wherein the anchor backing plate, the anchor plate, the clamping piece, the back pressure limiting device and the jack tensioning device are respectively provided with through holes for penetrating steel strands, and are sequentially arranged from bottom to top in a one-to-one corresponding mode; the anchor plate is arranged at the top of the anchor backing plate, the clamping piece is inserted at the top of the anchor plate, and the back pressure limiting device is fixedly arranged at the upper part of the anchor plate and used for limiting the vertical displacement of the clamping piece; the jack tensioning device is arranged at the top of the back pressure limiting device and used for tensioning the steel strand upwards.
2. The low retraction clip tensioning system according to claim 1, wherein the backpressure limiting device comprises a limiting member, a backpressure plate and a jacking mechanism, the limiting member being fixed to an upper portion of the anchor plate; the back pressure plate is slidably matched in the limiting piece and is abutted against the top surface of the clamping piece; the pushing mechanism is arranged between the limiting part and the counter pressure plate and used for pressing the counter pressure plate downwards towards the clamping piece.
3. The low retraction clip tensioning system according to claim 2, wherein the pushing mechanism is a pneumatic or hydraulic cylinder with two ends abutting against the lower side of the top of the retainer and the upper side of the counter plate, respectively.
4. The low retraction clip tensioning system according to claim 3, wherein a first receiving slot is provided inside the retainer, the counterpressure plate being slidably fitted into the first receiving slot; and a second containing groove is also arranged in the first containing groove, and the pushing mechanism is arranged in the second containing groove.
5. The low retraction clip tensioning system according to claim 4, wherein the height of said ejector mechanism when retracted is equal to or lower than the height of said second containment slot.
6. The low retraction clip tensioning system according to claim 3, wherein the limiting member is provided with a plurality of vertically arranged sliding grooves at intervals in the circumferential direction, the counter pressure plate is provided with a projection in the circumferential direction corresponding to the sliding grooves, and the projection is slidably fitted in the sliding grooves; the pushing mechanism is arranged between the lug and the sliding groove, and two acting ends of the pushing mechanism are respectively abutted against the lower side surface of the top of the sliding groove and the upper side surface of the lug.
7. The low retraction clip tensioning system according to claim 6, wherein said tab extends outwardly of said slide slot in a circumferential direction of said counter plate; a convex edge is arranged on the outer side of the limiting piece and corresponds to the upper part of the sliding groove along the circumferential direction of the limiting piece; the pushing mechanism is arranged between the convex block and the convex edge, and two acting ends of the pushing mechanism are respectively abutted to the lower side surface of the convex edge and the upper side surface of the convex block.
8. The low retraction clip tensioning system according to any one of claims 2 to 7, wherein there are a plurality of said ejection mechanisms, and a plurality of said ejection mechanisms are uniformly arranged in a ring shape in a horizontal direction.
9. The low retraction clip tensioning system according to claim 2, wherein the anchor plate is disposed in abutting relation on top of the anchor backing plate; the limiting piece is detachably fixed on the upper part of the anchor plate in a threaded connection mode; the jack tensioning device is arranged at the top of the back pressure limiting device in an abutting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707085.2U CN214942552U (en) | 2021-04-07 | 2021-04-07 | Low-retraction clamping piece tensioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707085.2U CN214942552U (en) | 2021-04-07 | 2021-04-07 | Low-retraction clamping piece tensioning system |
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| CN214942552U true CN214942552U (en) | 2021-11-30 |
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| CN202120707085.2U Active CN214942552U (en) | 2021-04-07 | 2021-04-07 | Low-retraction clamping piece tensioning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293467A (en) * | 2021-12-30 | 2022-04-08 | 重庆长江预应力有限公司 | Novel extrusion type hot-cast anchor |
| CN114319880A (en) * | 2022-03-07 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Method and system for determining limiting space of prestress tension limiting device |
-
2021
- 2021-04-07 CN CN202120707085.2U patent/CN214942552U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293467A (en) * | 2021-12-30 | 2022-04-08 | 重庆长江预应力有限公司 | Novel extrusion type hot-cast anchor |
| CN114293467B (en) * | 2021-12-30 | 2023-12-19 | 重庆长江预应力有限公司 | Extrusion type hot-cast anchorage device |
| CN114319880A (en) * | 2022-03-07 | 2022-04-12 | 四川交达预应力工程检测科技有限公司 | Method and system for determining limiting space of prestress tension limiting device |
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Address after: 610047 area a and B, 8th floor, Sichuan Expressway Building, No.90, West 1st section of 2nd Ring Road, Wuhou District, Chengdu City, Sichuan Province Patentee after: Sichuan Communications Construction Group Co.,Ltd. Address before: 610041 area a and B, 8th floor, Sichuan Expressway Building, No.90, West 1st section of 2nd Ring Road, Wuhou District, Chengdu City, Sichuan Province Patentee before: Sichuan Communications Construction Group Co.,Ltd. |