Prestressed steel strand tensioning device for highway reconstruction

Abstract

The utility model discloses a prestressed steel strand tensioning device for highway reconstruction, which relates to the technical field of prestressed construction equipment and comprises a moving component, the moving component comprises a moving base, two groups of support rods are mounted on the top surface of the moving base in bilateral symmetry, and a top plate is jointly mounted at the top ends of the two groups of support rods. The hydraulic ring cylinder drives the annular piston to drive the pushing ring to output pushing force, front-back linkage structures of the two sets of anchoring assemblies are matched, the anchor clamping cylinder is automatically clamped in the tensioning stage, and therefore the hydraulic ring cylinder can be used for lifting the anchor clamping cylinder, and the hydraulic ring cylinder can be used for lifting the anchor clamping cylinder. And self-locking fixing is achieved in the return stroke stage, so that automatic tensioning and stable anchoring of the steel strand are achieved through a mechanical closed loop, and the prestress applying precision and the structural safety are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of prestressed construction equipment, specifically a prestressed steel strand tensioning device for highway reconstruction. Background Technology

[0002] In highway reconstruction and bridge reinforcement projects, the tensioning of prestressed steel strands is a key link affecting the structural stress performance and construction quality. Traditional tensioning construction often relies on manual handling of jacks and anchors for on-site placement. The equipment positioning accuracy is low, and construction personnel need to repeatedly adjust the tensioning position, which not only results in high labor intensity but also easily leads to uneven stress on the steel strands or anchoring failure due to operational errors. Especially in the high-altitude working environment of bridges, the safety risks of hoisting and positioning are more prominent.

[0003] In existing technologies, although some improved tensioning devices have been optimized in terms of jack control or force monitoring, their overall structure is still relatively simple. They usually adopt a combination of fixed hoisting supports and manual anchors, which cannot achieve flexible movement and rapid deployment of the device on the construction site. At the same time, some devices still require manual intervention during the switching between tensioning and anchoring, which can easily lead to insufficient tension synchronization. Furthermore, the lack of automatic reset function during the anchor return phase results in low construction efficiency and large fluctuations in accuracy. Therefore, there is a need for a mechanical device that can achieve automatic tensioning and anchoring control of prestressed steel strands under complex working conditions. Utility Model Content

[0004] The purpose of this invention is to provide a prestressed steel strand tensioning device for highway reconstruction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A prestressed steel strand tensioning device for highway reconstruction includes a movable component. The movable component includes a movable base. Two sets of support rods are symmetrically installed on the top surface of the movable base. A top plate is installed at the top of the two sets of support rods. A hoisting component is fixedly installed on the bottom surface of the top plate. A hollow jack is installed at the bottom end of the hoisting component. Anchoring components are installed at both the front and rear ends of the hollow jack.

[0007] The anchoring assembly includes an anchor plate, and the front end face of the anchor plate has a plurality of anchoring holes equidistantly spaced around its circumference. The inner wall of each anchoring hole is a tapered hole that is wider at the front and narrower at the back.

[0008] A sliding rod is slidably inserted at the center of the front end face of the anchor plate. A drive plate is fixedly installed at the front end of the sliding rod, and a spring is sleeved at the rear end of the sliding rod after passing through the anchor plate.

[0009] The drive plate has several anchor clamps fixedly installed at equal intervals around its rear end face. Each of the anchor clamps corresponds to a number of anchoring holes. The rear end of the outer wall of the anchor clamp is provided with a tapered ring that is wider at the front and narrower at the back. The outer wall of the anchor clamp is provided with a contraction groove that runs through the left and right sides.

[0010] Furthermore, each of the four corners of the bottom surface of the mobile base is rotatably connected with a caster wheel, and a push handle is fixedly installed at the front end of the top surface of the mobile base.

[0011] Furthermore, the hoisting assembly includes a mounting frame and a movable pulley, with the mounting frame fixedly installed on the bottom surface of the top plate.

[0012] Furthermore, a rotating roller is rotatably mounted inside the mounting frame, and a steel cable is wound around the outer wall of the rotating roller. The end of the steel cable away from the rotating roller is fixedly connected to the bottom surface of the top plate, and a steel cable is sleeved on the outer wall of the movable pulley.

[0013] Furthermore, the driven gear is coaxially fixedly mounted on the rotating roller after passing through the side wall of the mounting frame, and a motor is fixedly mounted on the bottom surface of the top plate. The driving gear is coaxially fixedly mounted on the rotating shaft of the motor, and the driving gear meshes with the driven gear.

[0014] Furthermore, the hollow jack includes a hydraulic ring cylinder, the outer wall of which is fixedly connected to a movable pulley.

[0015] Furthermore, an annular piston is slidably installed on the inner wall of the hydraulic ring cylinder, and several connecting rods are equidistantly installed on the front end face of the annular piston. The ends of the connecting rods away from the annular piston pass through the front end wall of the hydraulic ring cylinder and are jointly fixedly installed with a push ring.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. When using the device of this utility model, the hollow jack can achieve rapid movement and vertical lifting and positioning of the tensioning position through the cooperation of the moving component and the hoisting component. The staff can complete the precise alignment of the end of the steel strand without manual hoisting, which improves the convenience of construction and the adaptability of the site.

[0018] 2. When the device of this utility model is in use, the speed reduction transmission structure formed by the motor, the driving gear and the driven gear drives the rotating roller to retract the steel cable, and the moving pulley realizes smooth lifting and lowering, thereby flexibly controlling the hollow jack and ensuring a smooth and safe lifting process;

[0019] 3. When the device of this utility model is in use, the hydraulic ring cylinder drives the annular piston to drive the push ring to output thrust. With the front and rear linkage structure of the two sets of anchoring components, the anchor clamp cylinder automatically clamps during the tensioning stage and achieves self-locking fixation during the return stage. Thus, the automatic tensioning and stable anchoring of the steel strand is achieved through mechanical closed loop, improving the accuracy of prestress application and structural safety. Attached Figure Description

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

[0021] Figure 2 This is an exploded view of the overall structure of this utility model;

[0022] Figure 3 This is an exploded view of the mobile component structure of this utility model;

[0023] Figure 4 This is an exploded view of the hoisting component structure of this utility model;

[0024] Figure 5 This is an exploded view of the hollow jack structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the anchoring component structure of this utility model;

[0026] Figure 7 This is an exploded view of the anchoring component structure of this utility model;

[0027] Figure 8 This is a drawing of the anchor clamp cylinder structure of this utility model;

[0028] Figure 9 This is a cross-sectional view of the anchoring component structure of this utility model.

[0029] In the picture:

[0030] 1. Moving component; 11. Moving base; 111. Support rod; 112. Top plate; 113. Push handle; 12. Casters;

[0031] 2. Lifting assembly; 21. Mounting frame; 22. Rotating roller; 23. Steel cable; 24. Driven gear; 25. Motor; 26. Driven gear; 27. Moving pulley;

[0032] 3. Hollow jack; 31. Hydraulic ring cylinder; 311. Connecting plate; 32. Annular piston; 321. Connecting rod; 322. Push ring;

[0033] 4. Anchoring assembly; 41. Anchor plate; 411. Anchoring hole; 42. Sliding rod; 421. Drive plate; 43. Spring;

[0034] 5. Anchor clamp; 51. Mounting ring; 52. Conical ring; 53. Shrinkage groove. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Example 1: Please refer to Figures 1-4 A prestressed steel strand tensioning device for highway reconstruction includes a movable component 1, which includes a movable base 11. Two sets of support rods 111 are symmetrically installed on the top surface of the movable base 11. A top plate 112 is installed at the top of the two sets of support rods 111. Specifically, the two sets of support rods 111 are welded to the top surface of the movable base 11. A hoisting component 2 is fixedly installed on the bottom surface of the top plate 112. A hollow jack 3 is installed at the bottom end of the hoisting component 2. Anchoring components 4 are installed at both the front and rear ends of the hollow jack 3.

[0037] The four corners of the bottom surface of the mobile base 11 are rotatably connected with casters 12. The front end of the top surface of the mobile base 11 is fixedly installed with a push handle 113. Specifically, an extension plate is welded and fixed to the front end of the top surface of the mobile base 11. The end of the extension plate away from the mobile base 11 is fixedly installed with a push handle 113. The operator can move the mobile base 11 with casters 12 by pushing the handle 113, which facilitates the movement of the hollow jack 3.

[0038] The hoisting assembly 2 includes a mounting frame 21 and a movable pulley 27. The mounting frame 21 is fixedly installed on the bottom surface of the top plate 112. Specifically, the mounting frame 21 is fixedly installed on the bottom surface of the top plate 112 by bolts. A rotating roller 22 is rotatably installed inside the mounting frame 21. A steel cable 23 is wound around the outer wall of the rotating roller 22. The end of the steel cable 23 away from the rotating roller 22 is fixedly connected to the bottom surface of the top plate 112. A steel cable 23 is sleeved on the outer wall of the movable pulley 27. The rotating shaft of the rotating roller 22 passes through the side wall of the mounting frame 21 and is coaxially fixedly installed with a pulley from... The drive gear 24 is fixedly mounted on the bottom surface of the top plate 112. The drive gear 26 is fixedly mounted on the rotating shaft of the motor 25. The drive gear 26 meshes with the driven gear 24. Specifically, the motor 25 drives the drive gear 26 to rotate. The number of teeth of the drive gear 26 is less than the number of teeth of the driven gear 24. The drive gear 26 and the driven gear 24 form a reduction gear set. The driven gear 24 drives the rotating roller 22 to rotate, controlling the winding and unwinding of the steel cable 23, and indirectly controlling the vertical movement of the movable pulley 27.

[0039] Example 2: Please refer to Figures 2-9A prestressed steel strand tensioning device for highway reconstruction differs from Embodiment 1 in that the hollow jack 3 includes a hydraulic ring cylinder 31. The outer wall of the hydraulic ring cylinder 31 is fixedly connected to a movable pulley 27. Specifically, a connecting frame is rotatably mounted on the outside of the movable pulley 27, and a connecting plate 311 is provided on the outer wall of the hydraulic ring cylinder 31. The connecting frame is fixedly connected to the connecting plate 311 by bolts. The motor 25 controls the winding and unwinding of the steel cable 23, indirectly controlling the vertical movement of the movable pulley 27 and the hollow jack 3. The inner wall of the hydraulic ring cylinder 31 is slidably mounted... There is an annular piston 32, and several connecting rods 321 are equidistantly installed on the front end face of the annular piston 32. The ends of the connecting rods 321 away from the annular piston 32 pass through the front end wall of the hydraulic ring cylinder 31 and are jointly fixedly installed with a push ring 322. Specifically, a first force-bearing ring is welded and fixed to the inner wall of the push ring 322, and a second force-bearing ring is welded to the inner ring wall of the hydraulic ring cylinder 31 near the rear end. One set of two anchoring components 4 is installed on the front end face of the first force-bearing ring, and the other set of anchoring components 4 is installed on the rear end face of the first force-bearing ring.

[0040] The anchoring assembly 4 includes an anchor plate 41. A plurality of anchoring holes 411 are equidistantly spaced on the front circumference of the anchor plate 41. The inner wall of each anchoring hole 411 is a tapered hole, wider at the front and narrower at the back. A sliding rod 42 is slidably inserted into the center of the front circumference of the anchor plate 41. A drive plate 421 is fixedly installed at the front end of the sliding rod 42. A spring 43 is sleeved on the rear end of the sliding rod 42 after passing through the anchor plate 41. Specifically, an insertion hole is provided at the center of the front circumference of the anchor plate 41. A blocking plate is fixedly installed on the rear end of the sliding rod 42 after passing through the insertion hole. The spring 43 is sleeved on the outer wall of the sliding rod 42. The front end of the spring 43 abuts against the rear end face of the anchor plate 41, and the rear end of the spring 43 abuts against the front end face of the blocking plate. The spring 43 provides a restoring force to the sliding rod 42. A plurality of anchor clamps 5 are equidistantly fixed on the rear circumference of the drive plate 421. Each anchor clamp 5 corresponds to one of the anchoring holes 411. An installation ring 51 is welded and fixed to the front end of the anchor clamp cylinder 5. Several through holes are equidistantly opened on the front circumference of the drive plate 421. The installation ring 51 is fixedly snapped into the inner wall of the through hole. The rear end of the outer wall of the anchor clamp cylinder 5 is provided with a tapered ring 52 that is wider at the front and narrower at the back. The outer wall of the anchor clamp cylinder 5 is provided with a contraction groove 53 that is equidistant from left to right. Specifically, several friction rings are equidistantly arranged on the inner wall of the anchor clamp cylinder 5. The hollow jack 3 is placed in the designated position by the moving component 1 and the hoisting component 2, and the steel strand is passed through the anchor clamp cylinder 5. At this time, the friction ring inside the anchor clamp cylinder 5 rubs against the steel strand, and the anchor clamp cylinder 5 pushes the drive plate 421 to move forward. The drive plate 421 drives the sliding rod 42 to move and compress the spring 43. At this time, the tapered ring 52 on the outer wall of the anchor clamp cylinder 5 does not contact the tapered hole inside the anchoring hole 411, and the contraction groove 53 of the anchor clamp cylinder 5 is not deformed. In this way, the steel strands of the two sets of anchoring components 4 are inserted.

[0041] Working principle: When using this device, the operator first moves the movable base 11 equipped with casters 12 by pushing the handle 113, moving the hollow jack 3 to the tensioning position of the prestressed steel strand. Two sets of support rods 111 fixedly installed on the top surface of the movable base 11 jointly support the top plate 112. The bottom surface of the top plate 112 is fixedly installed with the hoisting assembly 2. The hollow jack 3 is installed at the bottom of the hoisting assembly 2. The hoisting assembly 2 is used to adjust the vertical lifting of the hollow jack 3.

[0042] When the motor 25 starts, the shaft of the motor 25 drives the drive gear 26 to rotate. The drive gear 26 meshes with the driven gear 24 for transmission. The driven gear 24 drives the rotating roller 22 inside the mounting frame 21 to rotate synchronously. The steel cable 23 wound on the outer wall of the rotating roller 22 is wound and unwound under the drive of the rotating roller 22. The steel cable 23 is sleeved on the outer wall of the movable pulley 27. The winding and unwinding of the steel cable 23 drives the movable pulley 27 to lift and lower vertically, thereby realizing the lifting and positioning of the hollow jack 3 and completing the alignment and fixation of the tensioning end of the steel strand.

[0043] After the hollow jack 3 is positioned, the hydraulic cylinder 31 generates thrust through the internal hydraulic system. The annular piston 32 slides on the inner wall of the hydraulic cylinder 31. Several connecting rods 321 are connected to the front end of the annular piston 32. The front ends of the connecting rods 321 are used to fix the push ring 322. A first force ring is fixed on the inner wall of the push ring 322. A second force ring is fixed on the inner wall of the rear end of the hydraulic cylinder 31. Two sets of anchoring components 4 are respectively installed on the front end face of the first force ring and the rear end face of the second force ring. The annular piston 32 drives the push ring 322 to move axially, thereby realizing the output of driving force to the anchoring components 4 installed at the front end.

[0044] When the anchoring assembly 4 is working, after the steel strand is inserted into the anchor clamp 5, the friction ring on the inner wall of the anchor clamp 5 generates friction with the surface of the steel strand. The friction causes the anchor clamp 5 to drive the drive plate 421 to move forward. The drive plate 421 compresses the spring 43. At this time, the conical ring 52 on the outer wall of the anchor clamp 5 has not yet contacted the conical hole on the inner wall of the anchoring hole 411. The contraction groove 53 of the anchor clamp 5 maintains its original shape, which facilitates the smooth insertion of the steel strand.

[0045] When the hollow jack 3 begins to apply pressure, the push ring 322 pushes the first set of anchoring components 4 forward, the steel strand is driven to extend forward, the friction ring generates reverse resistance on the steel strand, the anchor clamp 5 slides backward, the spring 43 releases the elastic force, the sliding rod 42 returns to its original position, and the drive plate 421 drives several anchor clamps 5 to insert into the anchoring hole 411. At this time, the conical ring 52 on the outer wall of the anchor clamp 5 fits tightly with the conical hole inside the anchoring hole 411. The contraction groove 53 of the anchor clamp 5 generates radial contraction under the action of axial pressure, and the friction ring on the inner wall of the anchor clamp 5 achieves strong clamping with the surface of the steel strand, forming a stable anchoring state, thereby achieving effective tensioning of the steel strand.

[0046] Meanwhile, the second set of anchoring components 4 installed at the rear end of the hollow jack 3 does not play a locking role. When the steel strand is driven forward by the front anchoring component 4, the anchor clamp 5 in the rear anchoring component 4 is also driven by the friction of the steel strand. The drive plate 421 and the sliding rod 42 move synchronously and compress the spring 43. The conical ring 52 on the outer wall of the anchor clamp 5 does not contact the conical hole inside the anchoring hole 411. The contraction groove 53 of the anchor clamp 5 is not deformed. After the tensioning is completed, the spring 43 releases its elastic force, the drive plate 421 moves in the opposite direction, and drives the anchor clamp 5 to insert into the anchoring hole 411. The conical ring 52 and the conical hole form a conical surface fit, so that the anchor clamp 5 is locked. The friction ring on the inner wall of the anchor clamp 5 clamps the steel strand more tightly, thereby stabilizing the tensioning effect of the steel strand. At this point, the work of this device is completed.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A prestressed steel strand tensioning device for highway reconstruction, comprising a moving assembly (1), characterized in that: The moving component (1) includes a moving base (11). Two sets of support rods (111) are symmetrically installed on the top surface of the moving base (11). A top plate (112) is installed at the top of the two sets of support rods (111). A hoisting component (2) is fixedly installed on the bottom surface of the top plate (112). A hollow jack (3) is installed at the bottom end of the hoisting component (2). Anchoring components (4) are installed at both the front and rear ends of the hollow jack (3). The anchoring component (4) includes an anchor plate (41), and the front end face of the anchor plate (41) is provided with a plurality of anchoring holes (411) at equal intervals. The inner wall of the anchoring hole (411) is a tapered hole that is wider at the front and narrower at the back. A sliding rod (42) is slidably inserted at the center of the front end face of the anchor plate (41). A drive plate (421) is fixedly installed at the front end of the sliding rod (42). A spring (43) is sleeved on the rear end of the sliding rod (42) after passing through the anchor plate (41). The drive plate (421) has several anchor clamps (5) fixedly installed at equal intervals around its rear end face. The anchor clamps (5) correspond one-to-one with the positions of several anchor holes (411). The rear end of the outer wall of the anchor clamp (5) is provided with a tapered ring (52) that is wider at the front and narrower at the back. The outer wall of the anchor clamp (5) is provided with a contraction groove (53) that runs through the left and right sides.

2. The prestressed steel strand tensioning device for highway reconstruction according to claim 1, characterized in that: The four corners of the bottom surface of the mobile base (11) are rotatably connected with casters (12), and the front end of the top surface of the mobile base (11) is fixedly installed with a push handle (113).

3. The prestressed steel strand tensioning device for highway reconstruction according to claim 1, characterized in that: The hoisting assembly (2) includes a mounting frame (21) and a movable pulley (27), wherein the mounting frame (21) is fixedly installed on the bottom surface of the top plate (112).

4. The prestressed steel strand tensioning device for highway reconstruction according to claim 3, characterized in that: The mounting frame (21) has a rotating roller (22) rotatably mounted inside. The outer wall of the rotating roller (22) is wrapped with a steel cable (23). The end of the steel cable (23) away from the rotating roller (22) is fixedly connected to the bottom surface of the top plate (112). The outer wall of the movable pulley (27) is fitted with a steel cable (23).

5. A prestressed steel strand tensioning device for highway reconstruction according to claim 4, characterized in that: The rotating roller (22) has a driven gear (24) fixedly mounted coaxially after passing through the side wall of the mounting frame (21). The bottom surface of the top plate (112) is fixedly mounted with a motor (25). The rotating shaft of the motor (25) is fixedly mounted coaxially with a driving gear (26). The driving gear (26) meshes with the driven gear (24).

6. The prestressed steel strand tensioning device for highway reconstruction according to claim 4, characterized in that: The hollow jack (3) includes a hydraulic ring cylinder (31), the outer wall of which is fixedly connected to a movable pulley (27).

7. The prestressed steel strand tensioning device for highway reconstruction according to claim 6, characterized in that: The inner wall of the hydraulic ring cylinder (31) is slidably installed with an annular piston (32). Several connecting rods (321) are equidistantly installed on the front end face of the annular piston (32). The ends of the several connecting rods (321) away from the annular piston (32) pass through the front end wall of the hydraulic ring cylinder (31) and are jointly fixedly installed with a push ring (322).

Images