CN113832866A - Steel strand stretching device for prestressed anchorage device - Google Patents
Steel strand stretching device for prestressed anchorage device Download PDFInfo
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- CN113832866A CN113832866A CN202111272828.9A CN202111272828A CN113832866A CN 113832866 A CN113832866 A CN 113832866A CN 202111272828 A CN202111272828 A CN 202111272828A CN 113832866 A CN113832866 A CN 113832866A
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- fixed
- steel strand
- clamping
- anchor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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 tensioning device for a prestressed anchorage device, and relates to the technical field of prestressed anchorage devices. The tensioning device comprises a pre-embedded pipe which is pre-installed in bridge concrete, a spiral rib is wound outside the pre-embedded pipe, a plurality of steel strands are arranged in the pre-embedded pipe, a sleeve, a guide seat, a fixed anchor plate and a tensioning control mechanism are sequentially arranged outside the pre-embedded pipe, the sleeve is arranged in the bridge concrete, and the steel strands penetrate through the sleeve, the guide seat and the fixed anchor plate and then extend to the outer side of the fixed anchor plate. The tension control mechanism is used for tension control and adjustment, the fixing frame of the fixing mechanism is fixed and compacted with the bridge concrete during tension, the mounting plate synchronously stretches a plurality of steel strands through the plurality of tension mechanisms, the stability of the prestressed anchor during tension adjustment is guaranteed, the tension control mechanism is convenient to assemble with the bridge concrete, the fixing anchor plate and the steel strands, and the flexibility and the application range of the tension device are improved by synchronously stretching the plurality of steel strands.
Description
Technical Field
The invention relates to the technical field of prestressed anchorage devices, in particular to a steel strand tensioning device for a prestressed anchorage device.
Background
The prestressed anchorage device is an anchorage device for prestressed stretching of concrete in the course of engineering construction. Generally, the method is often used in bridge construction, the positioning is carried out in advance, then concrete is poured and buried at two ends of the concrete, namely two ends of a corrugated pipe, and the end faces are arranged for the stabilizing effect of a jack during tensioning. After the steel strand of the prestressed anchorage device is applied with the pre-stress, the rigidity of the component can be improved, the time of crack occurrence can be delayed, and the durability of the component can be improved.
The patent with the publication number of CN 208563120U discloses an anchoring steel strand tensioning device, which comprises a bridge, a pre-buried pipe, a spiral rib and an anchor cup which are arranged in the bridge comprise a positioning plate, a tensioning support is fixedly connected on the positioning plate, the tensioning support is in a U shape, the lower parts of two vertical supporting rods of the tensioning support are symmetrically provided with positioning blocks, the positioning blocks are provided with anti-rebound components, a group of lower limiting plates are arranged above the positioning blocks and on the tensioning support, upper limiting plates are arranged above the lower limiting plates and on the tensioning support, a sliding rail is arranged between the two limiting plates, a locking sliding seat is arranged on the sliding rail, a locking part is arranged on the locking sliding seat, a plurality of wedge-shaped holes are arranged on the locking part for steel strands to pass through, wedge-shaped sleeves are arranged in the wedge-shaped holes, locking nuts are arranged above the wedge-shaped sleeves and on the steel strands, a traction frame is arranged on the locking part, the upper end of the traction frame is fixedly connected with a connecting plate, the connecting plate is fixedly connected with a connecting shaft, the connecting shaft is fixedly connected with the piercing jack. The tensioning device can efficiently utilize the outer leakage steel strand, and the prestress loss is small. However, the following technical problems are found: the steel strand stretching device cannot guarantee the stability during stretching and adjusting, is inconvenient to assemble with bridge concrete, fixed anchor plates and steel strands, and cannot realize synchronous stretching of a plurality of steel strands.
Disclosure of Invention
The invention aims to provide a steel strand tensioning device for a prestressed anchorage device, which is used for solving the technical problems that the steel strand tensioning device in the prior art cannot ensure the stability during tensioning and adjustment, is inconvenient to assemble with bridge concrete, a fixed anchor plate and steel strands, and cannot realize synchronous tensioning on a plurality of steel strands.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a steel strand tensioning device for a prestressed anchor, which comprises a pre-buried pipe pre-installed in bridge concrete, wherein spiral ribs are wound outside the pre-buried pipe, a plurality of steel strands are arranged in the pre-buried pipe, a sleeve, a guide seat, a fixed anchor plate and a tensioning control mechanism are sequentially arranged outside the pre-buried pipe, the sleeve is arranged in the bridge concrete, the guide seat extends out of the bridge concrete, and the steel strands penetrate through the sleeve, the guide seat and the fixed anchor plate and then extend to the outer side of the fixed anchor plate;
the tensioning control mechanism comprises fixing mechanisms, a fixing frame and a jack, the two fixing mechanisms are arranged at the end face of the bridge concrete, the fixing frame is arranged outside the fixing mechanisms, the jack is connected with a mounting plate after the jack is arranged outside the fixing frame and a plunger of the jack penetrates through the fixing frame, and a plurality of tensioning mechanisms used for tensioning the steel strand are arranged on the inner surface of the mounting plate.
Further, fixed establishment includes first fixed plate, the second fixed plate, first mounting and second mounting, and first fixed plate is pre-buried installs in the bridge concrete, and the outside of first fixed plate is located to the second fixed plate, and a plurality of first mountings run through first fixed plate and stretch into in the second fixed plate, and a plurality of second mountings run through the second fixed plate and stretch into in the first fixed plate, and the end of second mounting is equipped with the cover and closes the section at first mounting outlying registrates, is equipped with torsion spring between the inner wall of registrate section and the outer wall of first mounting.
Furthermore, the cross section of the first fixing plate is T-shaped, and the second fixing piece is a screw rod, and a nut is arranged on the part, extending out of the second fixing plate, of the second fixing piece.
Further, the periphery that the steel strand wires stretched out the fixed anchor board outside is fixed with the extrusion anchor, and tensioning mechanism is including the centre gripping section of thick bamboo, the grip block of locating the mounting panel internal surface, and the inner chamber of a centre gripping section of thick bamboo runs through to be equipped with carries out the centre gripping chamber of centre gripping to the extrusion anchor, and the outer wall of a centre gripping section of thick bamboo runs through to be equipped with and wears the chamber, and the inner wall that wears the chamber is equipped with continuous wear-resisting arch.
Furthermore, the clamping plate is U-shaped and comprises a through plate and side plates arranged on two sides of the through plate, the through plate penetrates through the through cavity, and the end parts of the side plates are fixedly connected with the inner surface of the mounting plate; the center of the clamping plate is provided with a clamping seat for clamping the end part of the steel strand, and a compression spring is connected between the clamping seat and the side plate.
Furthermore, the jack is connected with a hydraulic pump through a pipeline, a pressure gauge is arranged on the hydraulic pump, and a graduated scale penetrating through the mounting plate is arranged between the fixed frame and the first fixing plate.
Furthermore, a group of first limiting parts for limiting the steel strand which is not bent and a group of second limiting parts for limiting the bent steel strand are arranged in the sleeve; the first locating part and the second locating part are the same in structure and respectively comprise a fixing seat, a roller and a rotating shaft, the roller is arranged on the fixing seat, the rotating shaft penetrates through the axis of the roller and can drive the roller to rotate, and the outer surface of the roller is in compression contact with the steel strand.
Furthermore, the inner cavity of the guide seat is provided with a plurality of oil way cavities surrounding the steel strand, one side of the guide seat is provided with an oil inlet, the other side of the guide seat is provided with an oil outlet, the oil inlet is communicated with the closest oil way cavity, the oil outlet is communicated with the closest oil way cavity, and the adjacent oil way cavities are communicated through a connecting pipe; a plurality of rolling rings are arranged in the oil circuit cavity and positioned on two sides of the path of the steel strand, the rolling rings are in compression contact with the steel strand, and a rolling shaft is arranged in the center of each rolling ring.
Furthermore, the periphery of the steel strand is positioned between the sleeve and the guide seat and wrapped by the conical clamping piece, and the inside of the fixed anchor plate is positioned at the periphery of the steel strand and wrapped by the wedge-shaped sleeve.
The working principle of the steel strand tensioning device for the prestressed anchorage device is as follows:
the hydraulic pump supplies pressure or releases pressure to the jack to realize horizontal movement of the plunger, the plunger drives the mounting plate to move horizontally, a clamping cavity in the clamping cylinder clamps the extrusion anchor, a clamping seat on the clamping plate clamps the steel strand, the wear-resistant bulge increases friction force between the wear-resistant bulge and the extrusion anchor, and the compression spring promotes the clamping seat to clamp the steel strand; in the tensioning process, the clamping cylinder moves outwards relative to the extrusion anchor, and the clamping seat drives the steel strand to be tensioned outwards so as to realize the tensioning of the steel strand;
the steel strand wires arranged in the sleeve are tightly pressed by the roller and can rotate around the rotating shaft, so that the steel strand wires are guided at the same time, and the stretching direction is kept unchanged;
lubricating oil lubricates the rolling ring in the oil way cavity, so that the friction force between the rolling ring and the steel strand is reduced, and the steel strand in the guide seat is tensioned under the guide of the rolling ring;
and observing the moving distance of the mounting plate through the graduated scale, and stopping tensioning after judging that the stress reaches a preset value.
The invention has the following beneficial effects:
1. the steel strand tensioning device for the prestressed anchorage of the invention is characterized in that a sleeve, a guide seat, a fixed anchor plate and a tensioning control mechanism are sequentially arranged outside an embedded pipe, so that the steel strands in the bridge concrete are pre-buried through the pre-buried pipes, and are dragged or fixed through the sleeves, the guide seats and the fixed anchor plates, the tensioning control mechanism is used for tensioning control and adjustment, the fixed frame of the fixed mechanism is fixed and compacted with the bridge concrete during tensioning, the plunger of the jack penetrates through the fixed frame and pushes the mounting plate to move, and the mounting plate synchronously tensions the steel strands through a plurality of tensioning mechanisms, the steel strand tensioning device ensures the stability of the prestressed anchor during tensioning and adjustment, the tensioning control mechanism is convenient to assemble with bridge concrete, the fixed anchor plate and the steel strands, and the flexibility and the application range of the tensioning device are improved by synchronously tensioning a plurality of steel strands.
2. First fixed plate and second fixed plate realize fastening the assembly through the cooperation between a plurality of first mountings and the second mounting, and torque spring has increased the tensile properties of first fixed plate and second fixed plate, and the nut realizes fastening outside the second fixed plate, and fixed frame can not be pulled apart with the second fixed plate is taut because of the stress is too big among the guarantee tensioning process.
3. In the tensioning process, the clamping cylinder moves outwards relative to the extrusion anchor, and the clamping seat drives the steel strand to be tensioned outwards so as to realize the tensioning of the steel strand; the stretching mechanism does not need the part of the steel strand extending out of the extrusion anchor to be too long, so that the cost of the steel strand is saved, and the steel strand is not easy to break away and rebound in the stretching process; the first limiting part limits the steel strand which is not bent, the second limiting part limits the steel strand which is bent, the steel strand which is arranged in the sleeve is compressed by the roller in the process of tensioning the steel strand, the steel strand can rotate around the rotating shaft, the steel strand is guided, and the tensioning direction is kept unchanged.
4. When lubricating oil is introduced from the oil inlet and enters each oil way cavity through the connecting pipe, the rolling rings in the oil way cavities are lubricated by the lubricating oil, so that the friction force between the rolling rings and the steel strands is reduced, and the steel strands in the guide seat are tensioned under the guide of the rolling rings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a steel strand tensioning device for a prestressed anchorage device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a tension control mechanism according to an embodiment of the present invention;
FIG. 3 is an exploded view of a clamping cylinder and clamping plate according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 1;
FIG. 5 is a schematic structural diagram of a fixing mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic view of the internal structure of the sleeve according to the embodiment of the present invention;
figure 7 is a side view of a fixed anchor plate according to an embodiment of the present invention.
Reference numerals: 10. pre-burying a pipe; 11. a spiral rib; 12. steel strand wires; 13. a tapered clip; 20. a sleeve; 21. a first limit piece; 22. a second limiting member; 23. a fixed seat; 24. a roller; 25. a rotating shaft; 30. a guide seat; 31. an oil circuit cavity; 32. an oil inlet; 33. an oil outlet; 34. a connecting pipe; 35. a rolling ring; 36. a roll axis; 40. fixing the anchor plate; 41. extruding the anchor; 42. a wedge-shaped sleeve; 50. a tension control mechanism; 51. a fixing mechanism; 52. a fixed frame; 53. a jack; 54. a plunger; 55. mounting a plate; 56. a clamping cylinder; 57. a clamping plate; 58. a compression spring; 59. a hydraulic pump; 60. a pressure gauge; 61. a graduated scale; 62. a pipeline; 100. concrete for the bridge; 511. a first fixing plate; 512. a second fixing plate; 513. a first fixing member; 514. a second fixing member; 515. a sleeving section; 516. a torsion spring; 517. a nut; 561. a clamping cavity; 562. a cavity is penetrated; 563. wear-resistant protrusions; 571. a threading plate; 572. a side plate; 573. a clamping seat.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-2 and 4, the embodiment provides a steel strand tensioning device for a prestressed anchor, including an embedded pipe 10 pre-installed in a bridge concrete 100, a spiral rib 11 is wound outside the embedded pipe 10, a plurality of steel strands 12 are arranged in the embedded pipe 10, a sleeve 20, a guide seat 30, a fixed anchor plate 40, and a tensioning control mechanism 50 are sequentially arranged outside the embedded pipe 10, the sleeve 20 is arranged in the bridge concrete 100, and the guide seat 30 extends out of the bridge concrete 100. The steel strand 12 penetrates through the sleeve 20, the guide seat 30 and the fixed anchor plate 40 and then extends to the outer side of the fixed anchor plate 40.
The tension control mechanism 50 includes fixing mechanisms 51, fixing frames 52, and jacks 53, the two fixing mechanisms 51 are disposed at end faces of the bridge concrete 100, the fixing frames 52 are disposed outside the fixing mechanisms 51, the jacks 53 are disposed outside the fixing frames 52, and a plunger 54 thereof penetrates the fixing frames 52 and is connected to an installation plate 55, and a plurality of tension mechanisms for tensioning the steel strands 12 are disposed on an inner surface of the installation plate 55.
The steel strand tensioning device for the prestressed anchorage tool is characterized in that a sleeve 20, a guide seat 30, a fixed anchor plate 40 and a tensioning control mechanism 50 are sequentially arranged outside an embedded pipe 10, after the steel strands 12 in the bridge concrete 100 are pre-buried through the pre-buried pipe 10 and are dragged or fixed through the sleeve 20, the guide seat 30 and the fixed anchor plate 40, the tensioning control mechanism 50 is used for tensioning control and adjustment, the fixed frame 52 of the fixed mechanism 51 is fixed and compacted with the bridge concrete 100 during tensioning, the plunger 54 of the jack 53 penetrates through the fixed frame 52 and pushes the mounting plate 55 to move, the mounting plate 55 synchronously tensions the steel strands 12 through a plurality of tensioning mechanisms, the steel strand tensioning device ensures the stability of the prestressed anchorage device during tensioning and adjustment, the tensioning control mechanism 50 is convenient to assemble with the bridge concrete 100, the fixed anchor plate 40 and the steel strands 12, the synchronous tensioning of the plurality of steel strands 12 improves the flexibility and the application range of the tensioning device.
As shown in fig. 2 and 5, the fixing mechanism 51 includes a first fixing plate 511, a second fixing plate 512, a first fixing member 513 and a second fixing member 514, the first fixing plate 511 is pre-embedded and installed in the bridge concrete 100, the second fixing plate 512 is disposed at an outer side of the first fixing plate 511, the first fixing members 513 penetrate through the first fixing plate 511 and extend into the second fixing plate 512, the second fixing members 514 penetrate through the second fixing plate 512 and extend into the first fixing plate 511, a sleeve section 515 covering a periphery of the first fixing member 513 is disposed at an end of the second fixing member 514, and a torsion spring 516 is disposed between an inner wall of the sleeve section 515 and an outer wall of the first fixing member 513.
The first fixing plate 511 has a T-shaped cross section, and the second fixing member 514 is a screw and a nut 517 is mounted on a portion extending out of the second fixing plate 512. In the fixing mechanism 51, the first fixing plate 511 and the second fixing plate 512 are fastened and assembled through the matching between the plurality of first fixing pieces 513 and the second fixing pieces 514, the torsion spring 516 increases the tensile strength of the first fixing plate 511 and the second fixing plate 512, and the nut 517 fastens the outside of the second fixing plate 512, so that the second fixing plate 512 is not pulled and broken due to the overlarge stress of the fixing frame 52 in the tensioning process.
Example 2
As shown in fig. 1-3, the steel strand tensioning device for the prestressed anchor provided in this embodiment is different from embodiment 1 in that an extrusion anchor 41 is fixed on a periphery of the steel strand 12 extending out of the fixed anchor plate 40, the tensioning mechanism includes a clamping cylinder 56 and a clamping plate 57 which are arranged on an inner surface of the mounting plate 55, a clamping cavity 561 which clamps the extrusion anchor 41 is arranged in an inner cavity of the clamping cylinder 56 in a penetrating manner, a penetrating cavity 562 is arranged in an outer wall of the clamping cylinder 56 in a penetrating manner, and a continuous wear-resistant protrusion 563 is arranged on an inner wall of the penetrating cavity 562.
The clamping plate 57 is U-shaped and includes a through plate 571 and side plates 572 disposed at two sides of the through plate 571, the through plate 571 penetrates the through cavity 562, and ends of the side plates 572 are fixedly connected with the inner surface of the mounting plate 55. A clamping seat 573 for clamping the end of the steel strand 12 is provided at the center of the clamping plate 57, and a compression spring 58 is connected between the clamping seat 573 and the side plate 572.
The tensioning mechanism is arranged, in the tensioning process of the mounting plate 55 under the action of the jack 53, the clamping cavity 561 in the clamping cylinder 56 clamps the extrusion anchor 41, the clamping seat 573 on the clamping plate 57 clamps the steel strand 12, the wear-resistant protrusion 563 increases the friction force between the wear-resistant protrusion and the extrusion anchor 41, and the compression spring 58 promotes the clamping seat 573 to clamp the steel strand 12; in the tensioning process, the clamping cylinder 56 moves outwards relative to the extrusion anchor 41, and the clamping seat 573 drives the steel strand 12 to be tensioned outwards, so that the steel strand 12 is tensioned. The stretching mechanism does not need the part of the steel strand 12 extending out of the extrusion anchor 41 to be too long, the cost of the steel strand 12 is saved, and the steel strand 12 is not easy to break loose and rebound in the stretching process.
The jack 53 is connected to a hydraulic pump 59 through a pipeline 62, a pressure gauge 60 is arranged on the hydraulic pump 59, and a graduated scale 61 penetrating through the mounting plate 55 is arranged between the fixed frame 52 and the first fixing plate 511. The hydraulic pump 59 supplies pressure or releases pressure to the jack 53 to realize horizontal movement of the plunger 54, and the pressure gauge 60 is convenient to monitor the pressure of the inner cavity of the jack 53, so that the safety of the tensioning process is improved. The graduated scale 61 is convenient for observing the moving distance of the mounting plate 55 in the tensioning process, and provides reference for the tensioning of the prestressed anchorage device after being marked.
Example 3
As shown in fig. 1-2, 4, and 6-7, a set of first limiting members 21 for limiting the unbent steel strand 12 and a set of second limiting members 22 for limiting the bent steel strand 12 are disposed in the sleeve 20. The first limiting part 21 and the second limiting part 22 have the same structure and respectively comprise a fixed seat 23, a roller 24 and a rotating shaft 25, the roller 24 is arranged on the fixed seat 23, the rotating shaft 25 penetrates through the axis of the roller 24 and can drive the roller 24 to rotate, and the outer surface of the roller 24 is in compression contact with the steel strand 12.
The first limiting part 21 limits the steel strand 12 which is not bent, the second limiting part 22 limits the steel strand 12 which is bent, the steel strand 12 arranged in the sleeve 20 is pressed by the roller 24 and can rotate around the rotating shaft 25 in the process of tensioning the steel strand 12, the effect of guiding the steel strand 12 is achieved, and the tensioning direction is kept unchanged.
The inner cavity of the guide seat 30 is provided with a plurality of oil path cavities 31 surrounding the steel strand 12, one side of the guide seat 30 is provided with an oil inlet 32, the other side of the guide seat 30 is provided with an oil outlet 33, the oil inlet 32 is communicated with the closest oil path cavity 31, the oil outlet 33 is communicated with the closest oil path cavity 31, and the adjacent oil path cavities 31 are communicated through a connecting pipe 34. A plurality of rolling rings 35 are arranged in the oil path cavity 31 and located on two sides of the path of the steel strand 12, the rolling rings 35 are in pressing contact with the steel strand 12, and a rolling shaft 36 is arranged in the center of each rolling ring 35. When lubricating oil is introduced from the oil inlet 32 and enters each oil path cavity 31 through the connecting pipe 34, the lubricating oil lubricates the rolling ring 35 in the oil path cavity 31, so that the friction force between the rolling ring 35 and the steel strand 12 is reduced, and the steel strand in the guide seat 30 is tensioned under the guide of the rolling ring 35.
The tapered clamping piece 13 is wrapped on the periphery of the steel strand 12 between the sleeve 20 and the guide seat 30, and the wedge-shaped sleeve 42 is wrapped on the periphery of the steel strand 12 inside the fixed anchor plate 40.
As shown in fig. 1 to 7, the working principle of the steel strand tensioning device for the prestressed anchorage device is as follows:
the hydraulic pump 59 supplies pressure or releases pressure to the jack 53, so that the plunger 54 horizontally moves, the plunger 54 drives the mounting plate 55 to horizontally move, the clamping cavity 561 in the clamping cylinder 56 clamps the extrusion anchor 41, the clamping seat 573 on the clamping plate 57 clamps the steel strand 12, the wear-resistant protrusion 563 increases the friction force between the wear-resistant protrusion 563 and the extrusion anchor 41, and the compression spring 58 promotes the clamping seat 573 to clamp the steel strand 12; in the tensioning process, the clamping cylinder 56 moves outwards relative to the extrusion anchor 41, and the clamping seat 573 drives the steel strand 12 to be tensioned outwards, so that the steel strand 12 is tensioned;
the steel strands 12 arranged in the sleeve 20 are tightly pressed by the roller 24 and can rotate around the rotating shaft 25, so that the steel strands 12 are guided at the same time, and the stretching direction is kept unchanged;
lubricating oil lubricates the rolling ring 35 in the oil path cavity 31, so that the friction force between the rolling ring 35 and the steel strand 12 is reduced, and the steel strand in the guide seat 30 is tensioned under the guide of the rolling ring 35;
the moving distance of the mounting plate 55 is observed through the graduated scale 61, and tensioning is stopped after the stress is judged to reach a preset value.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A steel strand tensioning device for a prestressed anchor comprises a pre-embedded pipe (10) which is pre-installed in bridge concrete (100), wherein spiral ribs (11) are wound outside the pre-embedded pipe (10), and a plurality of steel strands (12) are arranged in the pre-embedded pipe (10), and is characterized in that a sleeve (20), a guide seat (30), a fixed anchor plate (40) and a tensioning control mechanism (50) are sequentially arranged outside the pre-embedded pipe (10), the sleeve (20) is arranged in the bridge concrete (100), the guide seat (30) extends out of the bridge concrete (100), and the steel strands (12) penetrate through the sleeve (20), the guide seat (30) and the fixed anchor plate (40) and then extend to the outer side of the fixed anchor plate (40);
stretch-draw control mechanism (50) are including fixed establishment (51), fixed frame (52), jack (53), and the terminal surface department of bridge concrete (100) is located in two fixed establishment (51), and fixed frame (52) are located the outside of fixed establishment (51), and jack (53) are located the outside of fixed frame (52) and are connected with mounting panel (55) behind fixed frame (52) is run through in its plunger (54), and the internal surface of mounting panel (55) is equipped with a plurality of stretch-draw mechanisms that are used for carrying out the stretch-draw to steel strand wires (12).
2. The strand tensioning device for the prestressed anchorage device as claimed in claim 1, wherein, fixing mechanism (51) are including first fixed plate (511), second fixed plate (512), first mounting (513) and second mounting (514), pre-buried the installing in bridge concrete (100) of first fixed plate (511), the outside of first fixed plate (511) is located in second fixed plate (512), a plurality of first mounting (513) run through first fixed plate (511) and stretch into in second fixed plate (512), a plurality of second mounting (514) run through second fixed plate (512) and stretch into in first fixed plate (511), the end of second mounting (514) is equipped with and covers at first mounting (513) outlying registrated section (515), be equipped with torsion spring (516) between the inner wall of registrated section (515) and the outer wall of first mounting (513).
3. The strand tensioning device for the prestressed anchor as claimed in claim 2, wherein the first fixing plate (511) has a T-shaped cross-section, and the second fixing member (514) is a screw and has a nut (517) mounted on a portion thereof extending out of the second fixing plate (512).
4. The steel strand tensioning device for the prestressed anchor, as claimed in claim 1, wherein the periphery of the steel strand (12) extending out of the fixed anchor plate (40) is fixed with an extrusion anchor (41), the tensioning mechanism comprises a clamping cylinder (56) and a clamping plate (57) arranged on the inner surface of the mounting plate (55), a clamping cavity (561) for clamping the extrusion anchor (41) penetrates through the inner cavity of the clamping cylinder (56), a passing cavity (562) penetrates through the outer wall of the clamping cylinder (56), and a continuous wear-resistant protrusion (563) is arranged on the inner wall of the passing cavity (562).
5. The steel strand tensioning device for the prestressed anchorage as claimed in claim 4, wherein the clamping plate (57) is U-shaped and comprises a through plate (571) and side plates (572) arranged on two sides of the through plate (571), the through plate (571) penetrates through the through cavity (562), and the ends of the side plates (572) are fixedly connected with the inner surface of the mounting plate (55); a clamping seat (573) for clamping the end part of the steel strand (12) is arranged at the center of the clamping plate (57), and a compression spring (58) is connected between the clamping seat (573) and the side plate (572).
6. The strand tensioning device for the prestressed anchor as claimed in claim 1, wherein the jack (53) is connected to a hydraulic pump (59) through a pipeline (62), the hydraulic pump (59) is provided with a pressure gauge (60), and a scale (61) penetrating the mounting plate (55) is provided between the fixed frame (52) and the first fixing plate (511).
7. The strand tensioning device for the prestressed anchorage as claimed in claim 1, wherein a set of first limiting members (21) for limiting the unbent strands (12) and a set of second limiting members (22) for limiting the bent strands (12) are provided in the sleeve (20); the first limiting part (21) and the second limiting part (22) are identical in structure and respectively comprise a fixed seat (23), a roller (24) and a rotating shaft (25), the roller (24) is arranged on the fixed seat (23), the rotating shaft (25) penetrates through the axis of the roller (24) and can drive the roller (24) to rotate, and the outer surface of the roller (24) is in compression contact with the steel strand (12).
8. The steel strand tensioning device for the prestressed anchor as claimed in claim 1, wherein the inner cavity of the guide seat (30) is provided with a plurality of oil path cavities (31) surrounding the steel strand (12), one side of the guide seat (30) is provided with an oil inlet (32), the other side of the guide seat is provided with an oil outlet (33), the oil inlet (32) is communicated with the closest oil path cavity (31), the oil outlet (33) is communicated with the closest oil path cavity (31), and the adjacent oil path cavities (31) are communicated with each other through a connecting pipe (34); a plurality of rolling rings (35) are arranged in the oil path cavity (31) and positioned on two sides of the path of the steel strand (12), the rolling rings (35) are in pressing contact with the steel strand (12), and a rolling shaft (36) is arranged in the center of each rolling ring (35).
9. The strand tensioning device for the prestressed anchor as claimed in claim 1, wherein the tapered clamping piece (13) is wrapped around the strand (12) between the sleeve (20) and the guide seat (30), and the wedge-shaped sleeve (42) is wrapped around the strand (12) inside the fixed anchor plate (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111272828.9A CN113832866B (en) | 2021-10-29 | 2021-10-29 | Steel strand stretching device for prestressed anchorage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114541767A (en) * | 2022-01-20 | 2022-05-27 | 锦锐乾源通信设备科技有限公司 | Steel strand stretching anti-abrasion structure |
| CN114838644A (en) * | 2022-05-12 | 2022-08-02 | 湖南联智智能科技有限公司 | Tool clamping piece exposure measuring tool in narrow space |
| CN115110774A (en) * | 2022-06-16 | 2022-09-27 | 中化学建设集团有限公司 | Post-tensioning method prestressed beam tensioning method and system |
| CN115142685A (en) * | 2022-03-22 | 2022-10-04 | 中建八局发展建设有限公司 | Medical treatment steel strand wires for building pull fixing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114541767A (en) * | 2022-01-20 | 2022-05-27 | 锦锐乾源通信设备科技有限公司 | Steel strand stretching anti-abrasion structure |
| CN114541767B (en) * | 2022-01-20 | 2023-11-17 | 锦锐乾源通信设备科技有限公司 | Steel strand stretching anti-wear structure |
| CN115142685A (en) * | 2022-03-22 | 2022-10-04 | 中建八局发展建设有限公司 | Medical treatment steel strand wires for building pull fixing device |
| CN114838644A (en) * | 2022-05-12 | 2022-08-02 | 湖南联智智能科技有限公司 | Tool clamping piece exposure measuring tool in narrow space |
| CN115110774A (en) * | 2022-06-16 | 2022-09-27 | 中化学建设集团有限公司 | Post-tensioning method prestressed beam tensioning method and system |
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