Vertical prestress tensioning device

Abstract

The utility model discloses a vertical prestress tension device relates to bridge construction technical field, include: support spare, set up in the fixed cylinder and the jack of support spare top, at least part of the jack is located inside fixed cylinder, the inner wall of fixed cylinder extends to the direction of the jack and forms at least one guide block, the guide block is equipped with the inclined guide surface, and the fine rolled threaded steel of support spare and jack is successively penetrated, the utility model discloses the direction of fixed cylinder is removed to movable cylinder, under the guidance of the guide surface on the guide block, make the clamping piece resist to the outer wall of jack, guarantee fixed strength through fastener, can be flexibly adjusted according to the different outer diameter of jack, can ensure that the jack is installed with the reserved mouth, fine rolled threaded steel accurate keeping coaxial, avoid the deviation or shaking in the tension process because of uneven stress.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a vertical prestressing tensioning device. Background Technology

[0002] In bridge construction, the quality of vertical prestressing application in prestressed continuous rigid frame variable cross-section box girders directly affects structural stability, load-bearing capacity, and service life. The industry commonly uses precision-rolled threaded steel bars as vertical prestressing tendons, applying pre-set tension through tensioning equipment to counteract cracks and deformations during service life. Therefore, an efficient and reliable vertical prestressing tensioning scheme is crucial to project quality.

[0003] Currently, the vertical prestressing tensioning of precision-rolled threaded steel bars mainly relies on a through-hole jack in conjunction with anchorage. During construction, the precision-rolled threaded steel bar is inserted into the central hole of the jack, and the tensioning force of the jack is used to make the bar elongate by a preset amount. Then, the nut is tightened to lock the tensioning force, thereby applying vertical prestress. The process requires precise coordination around the axis of the bar to avoid prestress loss.

[0004] In actual construction, due to the small size of the prestressed opening in the vertical prestressing of the box girder, the fixation of the through-hole jack is obviously inconvenient. The existing tensioning device lacks a flexible and adaptable structure and cannot be adjusted according to the different outer diameters of the jack. As a result, it is difficult to keep the jack coaxial with the prestressed opening and the precision-rolled threaded steel during installation. During tensioning, it is easy to deviate or shake due to uneven force, which not only affects the tensioning accuracy, but may also cause additional frictional wear between the equipment and the reinforcement. It is difficult to meet the requirements of standardized construction for the stability of equipment fixation. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a vertical prestressing tensioning device to solve the problem that through-hole jacks are prone to displacement or swaying during tensioning due to uneven force.

[0006] This application provides a vertical prestressing tensioning device, comprising:

[0007] Support components;

[0008] A fixed cylinder and a jack are disposed on the top of the support member; at least a portion of the jack is disposed inside the fixed cylinder; the inner wall of the fixed cylinder extends toward the jack to form at least one guide block; the guide block is provided with an inclined guide surface.

[0009] Precision-rolled threaded steel bars that pass sequentially through the support member and the jack;

[0010] The top anchor is detachably installed on the top of the jack to anchor the precision-rolled threaded steel bar and the jack.

[0011] The movable cylinder is movably disposed on the side of the fixed cylinder away from the support member along the extension direction of the jack;

[0012] At least one clamping member is slidably connected to the movable cylinder along a first direction; the first direction is the radial direction of the jack;

[0013] When the movable cylinder moves toward the fixed cylinder, causing the clamping member to abut against the outer wall of the jack along the first direction under the action of the guide surface, the movable cylinder and the fixed cylinder are connected by fasteners.

[0014] In one feasible implementation, the fixed cylinder and the movable cylinder are arranged coaxially, and the inner wall of the movable cylinder extends in the axial direction of the movable cylinder to form at least one mounting block. The mounting block is slidably connected to a slide rod in the first direction, and the slide rod extends a predetermined length in the direction of the guide block and is connected to the clamping member.

[0015] In one feasible implementation, the mounting block is provided with a sliding groove, and a first guide rod is provided in the sliding groove along the first direction, and the sliding rod is slidably connected to the first guide rod.

[0016] In one feasible implementation, a spring is sleeved on the first guide rod, and the spring is located on the side of the slide rod opposite to the movable cylinder.

[0017] In one feasible implementation, the clamping member is a fixing block, and the fixing block has an arc-shaped block on the side near the axis of the movable cylinder.

[0018] In one feasible implementation, the support member comprises a support steel plate and multiple side steel plates, wherein,

[0019] The jack is installed on the top of the supporting steel plate, and the supporting steel plate has a first through hole, through which the precision rolled threaded steel bar is inserted.

[0020] Multiple side steel plates are disposed at the bottom of the supporting steel plate.

[0021] In one feasible implementation, a reserved slot is provided on the side steel plate.

[0022] In one feasible implementation, the fastener comprises at least one bolt and at least one second nut. The outer wall of the fixed cylinder near the movable cylinder is provided with a first boss, and the outer wall of the movable cylinder near the fixed cylinder is provided with a second boss. At least one bolt is provided on the side of the second boss near the first boss. At least one second through hole is provided on the first boss. The bolt passes through the second through hole and is threadedly connected to the second nut located on the side of the first boss away from the second boss, so as to fix the movable cylinder and the fixed cylinder.

[0023] In one feasible implementation, the first boss has at least one third through hole, and the second boss has at least one second guide rod on the side near the first boss, the second guide rod being slidably disposed in the third through hole.

[0024] In one feasible implementation, the top anchor includes:

[0025] A steel pad is detachably mounted on the top of the jack. A fourth through hole is provided on the steel pad, and the precision-rolled threaded steel bar passes through the fourth through hole.

[0026] At least one first nut is disposed on the side of the steel pad away from the jack and is threadedly connected to the fine-rolled threaded steel bar.

[0027] This utility model provides a vertical prestressing tensioning device, which has the following beneficial effects:

[0028] This invention involves moving the movable cylinder towards the fixed cylinder. Guided by the guide surface on the guide block, the clamping component abuts against the outer wall of the jack. Fasteners ensure the fixing strength. The fasteners can be flexibly adjusted according to the different outer diameters of the jack. This ensures that the jack is precisely coaxial with the reserved opening and the precision-rolled threaded steel during installation, avoiding deviation or shaking due to uneven force during tensioning. This improves tensioning accuracy and reduces additional friction loss between the equipment and the reinforcement, meeting the requirements of standardized construction for equipment fixing stability and ensuring construction efficiency and quality. Attached Figure Description

[0029] Figure 1 A three-dimensional structural schematic diagram of a vertical prestressing tensioning device provided for an embodiment of this utility model;

[0030] Figure 2 A top view of a vertical prestressed tensioning device provided in an embodiment of this utility model;

[0031] Figure 3 for Figure 2A cross-sectional view of a vertical prestressed tensioning device in the AA direction provided in this embodiment of the utility model;

[0032] Figure 4 for Figure 3 An enlarged view of part B of a vertical prestressed tensioning device provided in an embodiment of this utility model;

[0033] Figure 5 This is a three-dimensional structural diagram of a bolt and a second guide rod for a vertical prestressing tensioning device provided in an embodiment of the present utility model.

[0034] In the diagram: 1. Supporting steel plate; 2. Side steel plate; 3. Reserved slot; 4. Fixed cylinder; 5. First boss; 6. Movable cylinder; 7. Second boss; 8. Guide block; 81. Guide surface; 9. Mounting block; 10. Slide groove; 11. First guide rod; 12. Spring; 13. Slide rod; 14. Fixed block; 15. Arc block; 16. Jack; 17. Precision rolled threaded steel bar; 18. Steel pad; 19. First nut; 20. Bolt; 21. Second guide rod; 22. Second nut. 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] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] Furthermore, in this application, directional terms such as "upper," "lower," "inner," and "outer" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0038] To facilitate understanding of the technical solutions of the embodiments of this application by those skilled in the art, the technical terms involved in the embodiments of this application will be explained below.

[0039] A jack is a small lifting device that uses hydraulic and mechanical principles to lift heavy objects short distances. It comes in hydraulic and screw types, and can overcome large loads with minimal force. A through-hole jack is a special type of jack, named for its through-holes at both ends. It is primarily used in prestressed concrete engineering for tensioning reinforcing bars such as precision-rolled threaded steel. It uses hydraulically driven pistons, in conjunction with anchors, to complete the tensioning and anchoring of the reinforcing bars. It boasts high centering accuracy and strong adaptability, making it a key piece of equipment in large-scale prestressed engineering projects such as bridges and high-rise buildings.

[0040] The embodiments of this application will now be described with reference to the accompanying drawings.

[0041] This application provides a vertical prestressing tensioning device; please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 A three-dimensional structural schematic diagram of a vertical prestressing tensioning device provided for an embodiment of this utility model; Figure 2 A top view of a vertical prestressed tensioning device provided in an embodiment of this utility model; Figure 3 for Figure 2 A cross-sectional view of a vertical prestressed tensioning device in the AA direction provided in this embodiment of the present invention, as shown below. Figures 1-3 As shown.

[0042] The device includes: a support member; a fixed cylinder 4 and a jack 16 disposed on the top of the support member; a precision-rolled threaded steel bar 17 passing through the support member and the jack 16 in sequence; a top anchor; a movable cylinder 6 and at least one clamping member slidably connected to the movable cylinder 6 along a first direction, wherein the first direction is the radial direction of the jack 16.

[0043] In some embodiments, the support consists of a support steel plate 1 and multiple side steel plates 2. A jack 16 is disposed on the top of the support steel plate 1. A first through hole is provided on the support steel plate 1, and a precision-rolled threaded steel bar 17 is disposed through the first through hole. Multiple side steel plates 2 are disposed on the bottom of the support steel plate 1. A reserved slot 3 is provided on the side steel plates 2.

[0044] Specifically, there can be four side steel plates 2, which can be welded together and arranged in a circumferential array at the bottom of the supporting steel plate 1. Each side steel plate 2 can have a reserved slot 3, which provides tightening space for the nuts located inside the side steel plate 2 and threaded to the precision rolled threaded steel bar 17. After the vertical prestressing is completed, a torque wrench can be used to tighten the nuts inside the multiple side steel plates 2 into place, which can effectively avoid the adverse effects caused by the shrinkage of the precision rolled threaded steel bar 17.

[0045] At least a portion of the jack 16 is located inside the fixed cylinder 4; the inner wall of the fixed cylinder 4 extends toward the jack 16 to form at least one guide block 8; the guide block 8 is provided with an inclined guide surface 81.

[0046] Specifically, the fixed cylinder 4 can be fixedly installed on the top of the supporting steel plate 1 by welding. The axis of the fixed cylinder 4 coincides with the center of the first through hole opened on the supporting steel plate 1. At least one guide block 8 is arranged in a circumferential array on the inner wall of the fixed cylinder 4. For example, the number of guide blocks 8 can be two and they are arranged opposite each other on the inner wall of the fixed cylinder 4. The guide blocks 8 can be installed on the inner wall of the fixed cylinder 4 by welding. The inclined guide surface 81 provided by the guide block 8 can guide the clamping member. When the clamping member moves towards the fixed cylinder 4, it can also move towards the jack 16 under the action of the guide surface 81.

[0047] The top anchor is detachably installed on the top of the jack 16 to anchor the precision rolled threaded steel bar 17 and the jack 16.

[0048] In some embodiments, the top anchor includes a steel pad 18 and at least one first nut 19, wherein the steel pad 18 is detachably disposed on the top of the jack 16, and a fourth through hole is provided on the steel pad 18, through which the finely rolled threaded steel bar 17 passes; at least one first nut 19 is disposed on the side of the steel pad 18 away from the jack 16 and is threadedly connected to the finely rolled threaded steel bar 17.

[0049] Specifically, at least one first nut 19 is disposed on the top of the steel pad 18 and threadedly connected to the fine-rolled threaded steel bar 17. For example, there may be two first nuts 19, which are sequentially threadedly connected to the fine-rolled threaded steel bar 17 on the top of the steel pad 18. When the telescopic end of the through-hole jack 16 extends upward, it pushes the steel pad 18 to move upward. The steel pad 18 pushes the first nut 19 to move vertically upward. The first nut 19 drives the fine-rolled threaded steel bar 17 to move vertically upward, thereby performing vertical prestress tensioning on the fine-rolled threaded steel bar 17.

[0050] Please see Figure 4 , Figure 4 for Figure 3 An enlarged view of part B of a vertical prestressed tensioning device provided in this embodiment of the utility model is shown below. Figures 1-4 As shown.

[0051] The movable cylinder 6 is movably positioned on the side of the fixed cylinder 4 away from the support member, along the extension direction of the jack 16.

[0052] When the movable cylinder 6 moves toward the fixed cylinder 4, and the clamping member abuts against the outer wall of the jack 16 in the first direction under the action of the guide surface 81, the movable cylinder 6 and the fixed cylinder 4 are connected by fasteners.

[0053] In some embodiments, the fixed cylinder 4 and the movable cylinder 6 are coaxially arranged. The inner wall of the movable cylinder 6 extends in the axial direction of the movable cylinder 6 to form at least one mounting block 9. The mounting block 9 is slidably connected to a slide rod 13 in the first direction. The slide rod 13 extends a predetermined length in the direction of the guide block 8 and is connected to the clamping member. A slide groove 10 is provided on the mounting block 9. A first guide rod 11 is provided in the slide groove 10 in the first direction. The slide rod 13 is slidably connected to the first guide rod 11.

[0054] Specifically, when the movable cylinder 6 moves towards the fixed cylinder 4, the movable cylinder 6 moves at least one mounting block 9 on its inner wall. The mounting block 9 moves the first guide rod 11, which in turn moves the slide rod 13. The slide rod 13 moves the clamping member towards the fixed cylinder 4. When the clamping member abuts against the guide surface 81 on the guide block 8, under the guidance of the guide surface 81, the clamping member can abut against the outer wall of the jack 16 in the first direction. This can be flexibly adjusted according to the different outer diameters of the jack 16. The movable cylinder 6 and the fixed cylinder 4 are then fixed with fasteners to ensure that the jack 16 is firmly fixed. The number of clamping members, mounting blocks 9, guide rods, and slide rods 13 is the same. For example, there are two clamping members, mounting blocks 9, guide rods, and slide rods 13.

[0055] In some embodiments, the clamping member is a fixing block 14, and the fixing block 14 has an arc-shaped block 15 on the side near the axis of the movable cylinder 6.

[0056] Specifically, when the movable cylinder 6 moves toward the fixed cylinder 4, the sliding rod 13 drives the fixed block 14 to move in the same direction. The fixed block 14 may be provided with an inclined surface that cooperates with the guide surface 81. When the inclined surface contacts the guide surface 81, the fixed block 14 can abut against the outer wall of the jack 16 in the first direction. The arc-shaped block 15 provided on the side of the fixed block 14 near the jack 16 can improve the fixing strength. The opening direction of the arc-shaped block 15 is close to the direction of the jack 16 to meet the fixing requirements of jacks 16 with different outer diameters. For example, there are two fixed blocks 14 and two arc-shaped blocks 15.

[0057] In some embodiments, a spring 12 is sleeved on the first guide rod 11, and the spring 12 is located on the side of the slide rod 13 away from the movable cylinder 6.

[0058] Specifically, one end of the spring 12 abuts against the side wall of the slide groove 10 and the other end abuts against the slide rod 13. When the movable cylinder 6 moves away from the fixed cylinder 4 along the extension direction of the jack 16, the spring 12 gradually extends and retracts, causing the slide rod 13 to drive the fixed block 14 to move closer to the movable cylinder 6, so that the position of the fixed block 14 is reset.

[0059] Please see Figure 5 , Figure 5A three-dimensional structural diagram of a bolt and a second guide rod of a vertical prestressing tensioning device is provided for an embodiment of this utility model, as shown below. Figure 1-5 As shown.

[0060] In some embodiments, the fasteners are at least one bolt 20 and at least one second nut 22. The outer wall of the fixed cylinder 4 near the movable cylinder 6 is provided with a first boss 5, the outer diameter of the first boss 5 being larger than the outer diameter of the fixed cylinder 4. The outer wall of the movable cylinder 6 near the fixed cylinder 4 is provided with a second boss 7, the outer diameter of the second boss 7 being larger than the outer diameter of the movable cylinder 6. At least one bolt 20 is provided on the side of the second boss 7 near the first boss 5. At least one second through hole is provided on the first boss 5. The bolt 20 passes through the second through hole and is threadedly connected to the second nut 22 located on the side of the first boss 5 away from the second boss 7, so as to fix the movable cylinder 6 and the fixed cylinder 4.

[0061] For example, the number of bolts 20 can be three, and the number of second through holes and second nuts 22 can be three. The three bolts 20 are arranged in a circumferential array on the second boss 7. The positions of the three second through holes correspond to the positions of the three bolts 20. After the bolts 20 are tightened with nuts, the movable cylinder 6 and the fixed cylinder 4 are firmly fixed through the connection structure of bolts 20 and nuts. Based on the fixed state of the movable cylinder 6 and the fixed cylinder 4, the fixed block 14 can achieve a stable and reliable fixing effect on the jack 16. This ensures that the jack 16 is coaxial with the first through hole and the precision rolled threaded steel bar 17 during installation, avoiding deviation or shaking due to uneven force during tensioning, improving tensioning accuracy, and reducing additional frictional wear between the equipment and the rib.

[0062] In some embodiments, the first boss 5 has at least one third through hole, and the second boss 7 has at least one second guide rod 21 on the side near the first boss 5, and the second guide rod 21 is slidably disposed in the third through hole.

[0063] Specifically, at least one second guide rod 21 slides through at least one third through hole. When the movable cylinder 6 moves along the extension direction of the jack 16, the second guide rod 21 limits the movable cylinder 6 to prevent it from rotating during movement. For example, there can be three third through holes and three second guide rods 21. The three third through holes are arranged in a circumferential array on the first boss 5, and the positions of the three second guide rods 21 correspond to the positions of the three third through holes.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vertical prestressing tensioning device, characterized in that, include: Support components; A fixed cylinder (4) and a jack (16) are disposed on the top of the support member; at least a portion of the jack (16) is disposed inside the fixed cylinder (4); the inner wall of the fixed cylinder (4) extends toward the jack (16) to form at least one guide block (8); the guide block (8) is provided with an inclined guide surface (81). A precision-rolled threaded steel bar (17) that passes through the support member and the jack (16) in sequence; Top anchor, detachably mounted on the top of the jack (16), to anchor the precision rolled threaded steel bar (17) and the jack (16); The movable cylinder (6) is movably disposed on the side of the fixed cylinder (4) away from the support member along the extension direction of the jack (16); At least one clamping member is slidably connected to the movable cylinder (6) along a first direction; the first direction is the radial direction of the jack (16); When the movable cylinder (6) moves toward the fixed cylinder (4), and the clamping member abuts against the outer wall of the jack (16) along the first direction under the action of the guide surface (81), the movable cylinder (6) and the fixed cylinder (4) are connected by fasteners.

2. The vertical prestressing tensioning device according to claim 1, characterized in that, The fixed cylinder (4) is coaxially arranged with the movable cylinder (6). The inner wall of the movable cylinder (6) extends in the axial direction of the movable cylinder (6) to form at least one mounting block (9). The mounting block (9) is slidably connected to a slide rod (13) along the first direction. The slide rod (13) extends a predetermined length in the direction of the guide block (8) and is connected to the clamping member.

3. A vertical prestressing tensioning device according to claim 2, characterized in that, The mounting block (9) is provided with a sliding groove (10), and a first guide rod (11) is provided in the sliding groove (10) along the first direction. The sliding rod (13) is slidably connected to the first guide rod (11).

4. A vertical prestressing tensioning device according to claim 3, characterized in that, A spring (12) is sleeved on the first guide rod (11), and the spring (12) is located on the side of the slide rod (13) away from the movable cylinder (6).

5. A vertical prestressing tensioning device according to claim 1, characterized in that, The clamping component is a fixed block (14), and the fixed block (14) has an arc-shaped block (15) on the side near the axis of the movable cylinder (6).

6. A vertical prestressing tensioning device according to claim 1, characterized in that, The support consists of a support steel plate (1) and multiple side steel plates (2), wherein, The jack (16) is set on the top of the support steel plate (1), and the support steel plate (1) has a first through hole, through which the precision rolled threaded steel bar (17) is disposed; Multiple side steel plates (2) are disposed at the bottom of the supporting steel plate (1).

7. A vertical prestressing tensioning device according to claim 6, characterized in that, The side steel plate (2) has a reserved slot (3).

8. A vertical prestressing tensioning device according to claim 1, characterized in that, The fasteners are at least one bolt (20) and at least one second nut (22). The outer wall of the fixed cylinder (4) near the movable cylinder (6) is provided with a first boss (5) and the outer wall of the movable cylinder (6) near the fixed cylinder (4) is provided with a second boss (7). At least one bolt (20) is provided on the side of the second boss (7) near the first boss (5). The first boss (5) has at least one second through hole. The bolt (20) passes through the second through hole and is threadedly connected to the second nut (22) located on the side of the first boss (5) away from the second boss (7) to fix the movable cylinder (6) and the fixed cylinder (4).

9. A vertical prestressing tensioning device according to claim 8, characterized in that, The first boss (5) has at least one third through hole, and the second boss (7) has at least one second guide rod (21) on the side close to the first boss (5), and the second guide rod (21) is slidably disposed in the third through hole.

10. A vertical prestressing tensioning device according to claim 1, characterized in that, The top anchor includes: A steel pad (18) is detachably mounted on the top of the jack (16). A fourth through hole is provided on the steel pad (18), and the precision rolled threaded steel bar (17) passes through the fourth through hole. At least one first nut (19) is disposed on the side of the steel pad (18) away from the jack (16) and is threadedly connected to the fine-rolled threaded steel bar (17).

Images