Jack for prestress tensioning

Abstract

The utility model discloses a jack for prestress tensioning, which belongs to the technical field of bridge construction and comprises a tensioning jack for tensioning a steel strand and a connecting piece for lifting the tensioning jack, the connecting piece is arranged on the tensioning jack, and a positioning mechanism connected with the connecting piece is further arranged on the tensioning jack. The connecting piece comprises a connecting rod, two arc-shaped angle irons, two rollers and four limiting bolts, the two arc-shaped angle irons are symmetrically and fixedly arranged on the tensioning jack, and the four limiting bolts are in threaded connection with the two ends of the two arc-shaped angle irons respectively; by arranging a spring, the spring pushes an arc-shaped moving plate to move, so that the side face, provided with a tooth groove, of the arc-shaped moving plate can make contact with a fixed cone, then one end of the fixed cone can be inserted into the tooth groove, a tensioning jack can be connected with a roller through the moving plate and the fixed cone, and the roller is prevented from moving relative to the tensioning jack; and the tension stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and in particular relates to a jack for prestressing tensioning. Background Art

[0002] As a cable-stayed system, cable-stayed bridges have a greater span capacity than beam bridges and are the main type of long-span bridges. Cable-stayed bridges are suspended by many steel cables directly connected to the towers. Cable-stayed bridges are mainly composed of cable towers, main beams, and cable stays.

[0003] Since the span of the cable-stayed bridge is large, in order to improve the safety of the cable-stayed bridge, it is necessary to prestress it during the construction of the cable-stayed bridge. The steel strands are passed through the main beam, the steel strands are tensioned with jacks, and then the steel strands are anchored with anchors to complete the prestressing.

[0004] Among them, a tensioning jack is required when tensioning the steel strand. Since the tensioning jack is heavy, it needs to be hoisted when used. However, due to the error between the arrangement position of the steel strand and the hole on the anchor, the tensioning jack needs to be rotated when used to drive the anchor to align with the steel strand so that the steel strand can be inserted into the anchor. Therefore, the tensioning jack needs to be able to rotate relative to the hanging ear. The existing tensioning jack can rotate relative to the hanging ear, but cannot be fixed. During the tensioning operation, the tensioning jack is easy to rotate and has poor stability.

[0005] Moreover, when the steel strand is inserted into the anchor in the tensioning jack, it is difficult to put the tensioning jack on the steel strand due to the bending of the steel strand. For example, in the prior art represented by the internal card jack (publication number CN202481994U) in the comparative document, the piston cannot be removed. When inserting the steel strand, it is generally necessary to manually push the rear end of the tensioning jack, which is less safe. After the steel strand passes through the tensioning jack, it is easy to accidentally injure construction workers;

[0006] In summary, the utility model solves the existing problems by designing a prestressed tensioning jack. Utility Model Content

[0007] In order to solve the problem that the tensioning jack cannot be fixed, which causes the tensioning jack to rotate easily during the tensioning operation, the purpose of the utility model is to provide a prestressed tensioning jack to solve the above-mentioned problem.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a prestressed tensioning jack, comprising a tensioning jack for tensioning steel strands and a connecting piece for lifting the tensioning jack, the connecting piece being arranged on the tensioning jack, and the tensioning jack being further provided with a positioning mechanism connected to the connecting piece;

[0009] The connecting member includes a connecting rod, two arc angle irons, two rollers and four limit bolts, the two arc angle irons are symmetrical and fixedly arranged on the tensioning jack, the four limit bolts are respectively threadedly connected to the two ends of the two arc angle irons, the two rollers are respectively rollingly arranged between the arc angle irons and the tensioning jack, and the two rollers are respectively located between the four limit bolts, and the connecting rod is fixedly arranged between the two rollers;

[0010] The positioning mechanism includes two arc-shaped fixed plates, two arc-shaped movable plates with teeth and grooves, two fixed cones and multiple springs. The two arc-shaped fixed plates are symmetrical and fixedly arranged on the tensioning jack. The multiple springs are respectively fixedly arranged on the two arc-shaped fixed plates. The arc-shaped movable plate is fixedly arranged on one end of the spring away from the arc-shaped fixed plate. The two arc-shaped movable plates are respectively located on both sides of two arc-shaped angle irons. The two fixed cones are respectively fixedly arranged on one side away from the two rollers. The end of the fixed cone away from the roller slides through one side of the arc-shaped angle iron and can be inserted into the tooth groove on the arc-shaped movable plate.

[0011] As a preferred solution of the utility model, two front end fixing rings and two rear end fixing rings are symmetrically arranged on the two arc-shaped angle irons, and rotating rods are rotatably arranged inside the front end fixing ring and the rear end fixing ring, and a wedge block is fixedly arranged at one end of the rotating rod close to the arc-shaped movable plate, a connecting cap is fixedly arranged at one end of the fixing rod located on one side of the front end fixing ring away from the wedge block thereon, and a connecting ring is fixedly arranged at one end of the fixing rod located on one side of the rear end fixing ring away from the wedge block thereon.

[0012] As a preferred solution of the utility model, a rod body is inserted into the connecting ring, and one end of the rod body away from the connecting ring is threadedly connected to a connecting cap symmetrical to the connecting ring.

[0013] As a preferred solution of the utility model, it also includes a nut and a limiting rod, the nut is fixedly arranged on the limiting rod, and a shell with an opening is fixedly arranged at one end of the rod body away from the connecting cap, and a clip for clamping the steel wire rope is slidably arranged in the shell, and the nut can be threadedly sleeved on the rod body.

[0014] As a preferred solution of the utility model, the shell includes a bottom shell with an opening thereon and an upper cover, the clip is slidably arranged in the bottom shell, the upper cover is threadedly connected to the bottom shell, and the upper cover is fixedly connected to the rod body.

[0015] As a preferred solution of the utility model, one end of the limit rod can be inserted into the connecting ring, and the other end of the limit rod can be threadedly connected to the connecting cap.

[0016] As a preferred solution of the utility model, the connecting rod is also fixedly provided with a hanging ear, and a plurality of the hanging ears are distributed in a straight line.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The prestressed tensioning jack is provided with a spring, and the spring pushes the arc-shaped movable plate to move, so that the side surface of the arc-shaped movable plate with the tooth groove can contact with the fixed cone, and then one end of the fixed cone can be inserted into the tooth groove, and then the tensioning jack can be connected with the roller through the movable plate and the fixed cone, so as to prevent the roller from moving relative to the tensioning jack, and improve the stability during tensioning;

[0019] The prestressed tensioning jack is provided with an outer shell, and the outer shell can drive the internal clips thereof to be sleeved on the steel strand located inside the tensioning jack. The limiting rod is rotated to drive the nut to rotate, so that the nut can drive the outer shell to move through the rod body. The movement of the outer shell drives the clips to clamp the steel strand, so that the limiting rod pushes the tensioning jack to move relative to the steel strand, thereby facilitating the movement of the tensioning jack to the working position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of the utility model from another perspective;

[0022] Figure 3 It is a structural schematic diagram of the connecting rod in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the rod body in the utility model;

[0024] Figure 5 The schematic diagram of the structure of the transfer rod of the utility model is

[0025] Figure 6 It is a structural schematic diagram of the arc-shaped fixing plate in the utility model.

[0026] In the figure: 1. tensioning jack; 2. connecting piece; 201. connecting rod; 202. arc angle iron; 203. roller; 204. limiting bolt; 3. positioning mechanism; 301. arc fixed plate; 302. arc movable plate; 303. fixing cone; 304. spring; 305. tooth groove; 4. front end fixing ring; 5. rear end fixing ring; 6. rotating rod; 7. wedge block; 8. connecting cap; 9. connecting ring; 10. rod body; 11. nut; 12. limiting rod; 13. outer shell; 1301. bottom shell; 1302. upper cover; 14. clip; 15. hanging ear. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] Example: See Figure 1-6 The utility model provides a prestressed tensioning jack, comprising a tensioning jack 1 for tensioning steel strands and a connecting member 2 for lifting the tensioning jack 1, wherein the connecting member 2 is arranged on the tensioning jack 1, and a positioning mechanism 3 connected to the connecting member 2 is also arranged on the tensioning jack 1;

[0029] In this embodiment, reference Figure 1-3 The connecting member 2 includes a connecting rod 201, two arc angle irons 202, two rollers 203 and four limit bolts 204. The two arc angle irons 202 are symmetrically and fixedly arranged on the tensioning jack 1. The four limit bolts 204 are respectively threadedly connected to the two ends of the two arc angle irons 202. The two rollers 203 are respectively rollingly arranged between the arc angle irons 202 and the tensioning jack 1, and the two rollers 203 are respectively located between the four limit bolts 204. The connecting rod 201 is fixedly arranged between the two rollers 203. The connecting rod 201 can be hoisted by a crane, and then the tensioning jack 1 is hoisted by the rollers 203 and the arc angle irons 202. The tensioning jack 1 is rotated so that the rollers 203 can roll between the tensioning jack 1 and the arc angle irons 202, so as to achieve the effect of adjusting the angle of the anchor in the tensioning jack 1, so as to facilitate the steel strand to penetrate the tensioning jack 1.

[0030] In this embodiment, reference Figure 6The positioning mechanism 3 includes two arc-shaped fixed plates 301, two arc-shaped movable plates 302 with tooth grooves 305, two fixed cones 303 and multiple springs 304. The two arc-shaped fixed plates 301 are symmetrical and fixedly arranged on the tensioning jack 1. The multiple springs 304 are respectively fixedly arranged on the two arc-shaped fixed plates 301. The arc-shaped movable plate 302 is fixedly arranged on one end of the spring 304 away from the arc-shaped fixed plate 301. The two arc-shaped movable plates 302 are respectively located on both sides of the two arc-shaped angle irons 202. The two fixed cones 303 are respectively fixedly arranged on one side away from the two rollers 203. The end of the fixed cone 303 away from the roller 203 slides through one side of the arc-shaped angle iron 202 and can be inserted into the tooth groove 305 on the arc-shaped movable plate 302. The elasticity of the spring 304 can push the arc moving plate 302 to squeeze one side of the arc angle iron 202, so that the arc moving plate 302 can contact the arc angle iron 202, wherein an arc hole is opened on the arc angle iron 202, and the fixed cone 303 passes through the arc hole and is inserted into the tooth groove 305 on the arc moving plate 302, so that the arc moving plate 302 can limit the fixed cone 303, and prevent the fixed cone 303 from moving relative to the tensioning jack 1, thereby preventing the roller 203 and the connecting rod 201 from rotating relative to the tensioning jack 1, and preventing the tensioning jack 1 from rotating during tensioning, thereby improving safety and stability, and pulling the arc moving plate 302 can drive the size to separate from the fixed cone 303, so as to facilitate the rotation of the tensioning jack 1 to adjust the angle;

[0031] Among them, two front-end fixing rings 4 and two rear-end fixing rings 5 ​​are symmetrically arranged on the two arc angle irons 202, and rotating rods 6 are rotatably arranged on the front-end fixing ring 4 and the rear-end fixing ring 5. A wedge block 7 is fixedly arranged on the end of the rotating rod 6 close to the arc moving plate 302, and a connecting cap 8 is fixedly arranged on the end of the fixing rod located on the side of the front-end fixing ring 4 away from the wedge block 7 thereon, and a connecting ring 9 is fixedly arranged on the end of the fixing rod located on the side of the rear-end fixing ring 5 away from the wedge block 7 thereon. Pulling the connecting ring 9 and the connecting cap 8, the connecting ring 9 and the connecting cap 8 can drive the rotating rod 6 thereon to rotate, and then the rotating rod 6 can drive the wedge block 7 to rotate, so that the wedge block 7 can be rotatably inserted between the arc angle iron 202 and the arc moving plate 302, which is convenient for moving the arc moving plate 302 and improves convenience;

[0032] Among them, a rod body 10 is inserted into the connecting ring 9, and one end of the rod body 10 away from the connecting ring 9 is threadedly connected to a connecting cap 8 symmetrical to the connecting ring 9. Pulling the rod body 10 can drive the symmetrical connecting ring 9 and the connecting cap 8 to rotate synchronously, thereby driving the two symmetrical wedge blocks 7 to rotate synchronously, so that the two arc plates can be separated from the fixed cone 303 synchronously, which is convenient for simultaneously pushing the two arc movable plates 302 to move, thereby improving convenience;

[0033] In this example, see Figure 4 , further comprising a nut 11 and a limiting rod 12, the nut 11 being fixedly arranged on the limiting rod 12, a housing 13 having an opening fixedly arranged on the end of the rod body 10 away from the connecting cap 8, a clip 14 for clamping the steel strand being slidably arranged in the housing 13, the nut 11 being threadably sleeved on the rod body 10, the clip 14 being able to be sent into the interior of the tensioning jack 1 through the housing 13, so that the clip 14 can be sleeved on the steel strand located inside the tensioning jack 1, and the rod body 10 is pulled outward through The housing 13 drives the clip 14 to move, so that the clip 14 can be clamped on the steel strand, and the nut is threadedly sleeved on the rod body 10. The limit rod 12 is rotated to drive the nut 11 to rotate, so that the limit rod 12 can contact the rear end of the tensioning jack. The limit rod 12 is continuously rotated, and the rod body 10 can be pulled through the nut 11, so that the rod body 10 pulls the steel strand through the housing 13 and the clip 14, and then the tensioning jack 1 can move relative to the steel strand, so that the tensioning jack 1 is sleeved on the steel strand;

[0034] The housing 13 includes a bottom shell 1301 with an opening thereon and an upper cover 1302, the clip 14 is slidably arranged in the bottom shell 1301, the upper cover 1302 is threadedly connected to the bottom shell 1301, and the upper cover 1302 is fixedly connected to the rod body 10. The bottom shell 1301 is rotated to separate it from the upper cover 1302, so as to facilitate the replacement of the clip 14 inside it. Replacing clips 14 of different sizes facilitates the clamping of steel strands of different types;

[0035] One end of the limiting rod 12 can be inserted into the connecting ring 9, and the other end of the limiting rod 12 can be threadedly connected to the connecting cap 8. Pulling the limiting rod 12 can drive the symmetrical connecting cap 8 and the connecting ring 9 to rotate, so as to drive the arc-shaped movable plate 302 to separate from the fixed cone 303. The limiting rod 12 is located on the side of the connecting rod 201 away from the rod body 10, so as to control the movement of the arc-shaped movable plate 302 on both sides.

[0036] In this embodiment, reference Figure 3 A lug 15 is also fixedly provided on the connecting rod 201, and a plurality of lugs 15 are distributed in a straight line. The lug 15 connected to the lifting equipment can be selected according to different anchor models, so that the tensioning jack 1 can maintain balance and avoid tilting.

[0037] Based on the above conditions, the workflow designed using this solution is as follows:

[0038] When in use, first use a lifting device to hang it on the hanging ear 15, then lift the tensioning jack 1 to the same height as the steel strand, then pull the rod body 10 or the limit rod 12 to drive the connecting ring 9 and the connecting cap 8 to rotate, and then drive the wedge block 7 to rotate through the rotating rod 6, so that the wedge block 7 can push the arc-shaped moving plate 302 to separate from the fixed cone 303, and at the same time, pull the limit rod 12 and the rod body 10 to drive the tensioning jack 1 to rotate, so that the anchor in the tensioning jack 1 can be aligned with the steel strand, which is convenient for inserting the steel strand into the anchor in the tensioning jack 1, and then rotate the rod body 10, the limit rod 12 and the connecting ring 9 to rotate. The connecting cap 8 is separated, and the outer shell 13 is sent into the tensioning jack 1 through the rod body 10, so that the outer shell 13 and the clip 14 inside it can be sleeved on the end of the steel strand. The outer pull rod body 10 allows the clip 14 to be clamped on the end of the steel strand, and the nut 11 is threadedly sleeved on the rod body 10. The limit rod 12 is rotated to drive the nut 11 to rotate, so that the limit rod 12 contacts with the tensioning jack 1. When the limit rod 12 contacts with the tensioning jack 1, it cannot move, so that the nut 11 can pull the rod body 10 to move, and then the steel strand moves relative to the tensioning jack 1, so that the tensioning jack 1 can be sleeved on the steel strand.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prestressed tensioning jack, characterized in that: It comprises a tensioning jack (1) for tensioning a steel strand and a connecting piece (2) for lifting the tensioning jack (1), wherein the connecting piece (2) is arranged on the tensioning jack (1), and the tensioning jack (1) is also provided with a positioning mechanism (3) connected to the connecting piece (2); The connecting member (2) comprises a connecting rod (201), two arc-shaped angle irons (202), two rollers (203) and four limiting bolts (204); the two arc-shaped angle irons (202) are symmetrically and fixedly arranged on the tensioning jack (1); the four limiting bolts (204) are respectively threadedly connected to the two ends of the two arc-shaped angle irons (202); the two rollers (203) are respectively rollingly arranged between the arc-shaped angle irons (202) and the tensioning jack (1); the two rollers (203) are respectively located between the four limiting bolts (204); and the connecting rod (201) is fixedly arranged between the two rollers (203); The positioning mechanism (3) comprises two arc-shaped fixed plates (301), two arc-shaped movable plates (302) having tooth grooves (305), two fixed cones (303) and a plurality of springs (304); the two arc-shaped fixed plates (301) are symmetrically and fixedly arranged on the tensioning jack (1); the plurality of springs (304) are respectively fixedly arranged on the two arc-shaped fixed plates (301); the arc-shaped movable plates (302) are fixedly arranged on one end of the springs (304) away from the arc-shaped fixed plates (301); the two arc-shaped movable plates (302) are respectively located on both sides of two arc-shaped angle irons (202); the two fixed cones (303) are respectively fixedly arranged on one side of two rollers (203) away from each other; the end of the fixed cone (303) away from the roller (203) slides through one side of the arc-shaped angle iron (202) and can be inserted into the tooth groove (305) on the arc-shaped movable plate (302).

2. A prestressed tensioning jack according to claim 1, characterized in that: Two front-end fixing rings (4) and two rear-end fixing rings (5) are symmetrically arranged on the two arc-shaped angle irons (202), and rotating rods (6) are rotatably arranged inside the front-end fixing ring (4) and the rear-end fixing ring (5). A wedge-shaped block (7) is fixedly arranged on one end of the rotating rod (6) close to the arc-shaped movable plate (302), a connecting cap (8) is fixedly arranged on one end of the fixing rod located on one side of the front-end fixing ring (4) away from the wedge-shaped block (7) thereon, and a connecting ring (9) is fixedly arranged on one end of the fixing rod located on one side of the rear-end fixing ring (5) away from the wedge-shaped block (7) thereon.

3. A prestressed tensioning jack according to claim 2, characterized in that: A rod body (10) is inserted into the connecting ring (9), and one end of the rod body (10) away from the connecting ring (9) is threadedly connected to a connecting cap (8) symmetrical to the connecting ring (9).

4. A prestressed tensioning jack according to claim 3, characterized in that: The invention also comprises a nut (11) and a limiting rod (12), wherein the nut (11) is fixedly arranged on the limiting rod (12), and a housing (13) having an opening is fixedly arranged on one end of the rod body (10) away from the connecting cap (8), and a clamping piece (14) for clamping the steel strand is slidably arranged in the housing (13), and the nut (11) can be threadedly sleeved on the rod body (10).

5. A prestressed tensioning jack according to claim 4, characterized in that: The housing (13) comprises a bottom shell (1301) having an opening thereon and an upper cover (1302); the clip (14) is slidably disposed in the bottom shell (1301); the upper cover (1302) is threadedly connected to the bottom shell (1301); and the upper cover (1302) is fixedly connected to the rod body (10).

6. A prestressed tensioning jack according to claim 4, characterized in that: One end of the limiting rod (12) can be inserted into the connecting ring (9), and the other end of the limiting rod (12) can be threadedly connected to the connecting cap (8).

7. The prestressed tensioning jack according to claim 1, characterized in that: A hanging ear (15) is also fixedly provided on the connecting rod (201), and a plurality of the hanging ears (15) are distributed in a straight line.

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