A steel strand clamping device on bridge prestressing tensioning equipment

Abstract

The present invention provides a steel strand clamping device on a bridge prestressing tensioning device, belonging to the technical field of bridge construction equipment. The steel strand clamping device includes a slider and an annular slot provided on the outer side of the slider, the outer edge of the slot has a step surface, and the steel strand clamping device also includes a clamping block, the clamping block has a plug corresponding to the slot and a retaining ring corresponding to the step surface, the retaining ring and the step surface are connected by a tension spring; a boss is formed between the slot and the threading hole, a plurality of sliding holes are evenly provided on the axis of the boss, a pressing block is slidably connected in the sliding hole, the outer side of the pressing block has a protrusion, and the inner side of the pressing block has an "eight"-shaped pressing claw; the plug can squeeze the protrusion and make the pressing claw rest against the steel strand in the threading hole. The present invention has the advantages of stable and reliable clamping.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction equipment and relates to a steel strand clamping device on a bridge prestressed tensioning device. Background Art

[0002] Prestressing is the process of applying prestress in the concrete components of a bridge in advance, so that the prestressed components are subjected to compressive stress, thereby causing them to undergo a certain deformation to cope with the load borne by the beam-type components themselves.

[0003] Before the engineering structural components are subjected to external loads, pre-stress is applied to the steel strands in the tension module to improve the bending resistance and rigidity of the components, delay the appearance of cracks, and increase the durability of the components. For mechanical structures, it means to generate stress in advance, which has the advantage of increasing the rigidity of the structure itself, reducing vibration and elastic deformation. This can significantly improve the elastic strength of the tension module and make the original resistance stronger.

[0004] In the prior art, the steel strands are generally tensioned one by one using a jack, the construction process is cumbersome, and the steel strands are driven by a hydraulic device, which places high demands on the construction environment and auxiliary construction equipment.

[0005] That is to say, during the entire construction process and the entire prestressing process, hydraulic cylinders and other equipment need to operate continuously on site without any mistakes or errors, otherwise it will affect the preload of the steel strands and thus affect the bridge construction.

[0006] The existing prestressed tensioning equipment for steel strands has poor reliability and poor reuse rate. The reasons are, on the one hand, that there is no overall equipment to control multiple steel strands, the tensioning force cannot be adjusted by manpower, and the preload force of the steel strands cannot be maintained without relying on other external equipment. On the other hand, the fixation of the steel strands is unreliable, and in poor construction environments, it is easy to cause defects such as rust, jamming, and difficulty in disassembly and assembly. Summary of the invention

[0007] The purpose of the present invention is to provide a steel strand clamping device on a bridge prestressing tensioning device in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the present invention is how to reliably fix the steel strand.

[0008] The objective of the present invention can be achieved through the following technical solutions: A steel strand clamping device on a bridge prestressing tensioning device, characterized in that the steel strand clamping device comprises a slider and an annular slot opened on the outer side of the slider, the outer edge of the slot has a step surface, the steel strand clamping device also comprises a clamping block, the clamping block has a plug corresponding to the slot and a retaining ring corresponding to the step surface, the retaining ring and the step surface are connected by a tension spring; a boss is formed between the slot and the threading hole, a plurality of sliding holes are evenly opened on the axis of the boss, a pressing block is slidably connected in the sliding hole, the outer side of the pressing block has a protrusion, and the inner side of the pressing block has an "eight"-shaped pressing claw; the plug can squeeze the protrusion and make the pressing claw rest against the steel strand in the threading hole.

[0009] In the above-mentioned steel strand clamping device on the prestressed tensioning equipment of a bridge, a hollow pull rod is fixedly arranged on the outer surface of the clamping block, a positioning hole which is in the same straight line as the threading hole is opened at the outer end of the pull rod, and an end cover is threadedly connected to the outer end of the pull rod.

[0010] The end of the steel strand is located on the outer side of the pull rod in a bent manner, and the end of the steel strand is fixed by pressing the end cover, making the fixation of the steel strand more reliable.

[0011] When inserting the steel strand, the pull rod can be pulled outward to move the plug away from the slot to avoid the clamping block from hindering the insertion of the steel strand. When the steel strand is inserted to the appropriate position, the pull rod is released. Under the action of the tension spring, the plug is inserted into the slot, allowing the clamping block to clamp the steel strand.

[0012] By fixing the steel strand twice, that is, the end is fixed by the end cover and the inner part is clamped by the clamping block, the clamping of the steel strand is made more reliable. At the same time, since the steel strand is pulled, the clamping block is driven to move in the direction of the slider, so that the plug exerts a greater force on the clamping block, thereby making the clamping of the steel strand more stable. That is, when the steel strand is subjected to external forces, or when stress and bearing force are caused to the steel strand during construction, the clamping of the steel strand will become more and more firm.

[0013] In the above-mentioned steel strand clamping device on the prestressed tensioning equipment of a bridge, the sliding hole is in an "I" shape, and the pressing claw is detachably connected to the protrusion.

[0014] The sliding hole is in an "I" shape, which can ensure that the pressing block will not fall out of the sliding block, and the two parts of the pressing block are detachably connected, so that the pressing block can be easily installed in the sliding hole.

[0015] Among them, the outer end of the pressing claw has a cylindrical connecting head, the connecting head has a threaded hole, the inner section of the protrusion has a pin, the pin is threaded in the threaded hole, the connecting head is slidably connected to the middle section of the sliding hole, the protrusion can be retracted in the outer section of the sliding hole, and the pressing claw can be retracted in the inner section of the sliding hole. When the steel strand is inserted, the protrusion extends outward and the pressing claw retracts to the inner section of the sliding hole to facilitate the insertion of the steel strand. When the plug is inserted, the protrusion moves inward, the pressing claw moves synchronously, and clamps the steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the prestressed tensioning equipment of this bridge.

[0017] Figure 2 is a cross-sectional view of the tensioner.

[0018] Figure 3 yes Figure 2 Enlarged view of part A in the figure.

[0019] In the figure, 1, base; 11, mounting plate; 12, ground pile; 21, sleeve; 22, slider; 23, rotating block; 24, driving disk; 25, mounting step; 26, slide rod; 27, guide hole; 28, threading hole; 31, slot; 32, step surface; 33, clamping block; 34, plug; 35, retaining ring; 36, tension spring; 37, boss; 38, sliding hole; 39, clamping block; 391, protrusion; 392, pressure claw; 41, pull rod; 42, positioning hole; 43, end cover; 5, force block; 61, locking hole; 62, locking bolt. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1 and Figure 2 As shown, the prestressed tensioning equipment includes a base 1 and a plurality of tensioners arranged on the base 1 and capable of tensioning and prestressing the steel strands;

[0022] The tensioner includes a sleeve 21, a slider 22, a rotating block 23 and a driving disk 24. The outer wall of the sleeve 21 is fixedly connected to the base 1. The inner wall of the sleeve 21 has an internal spline, and the outer surface of the slider 22 has an external spline that matches the internal spline. The inner wall of the sleeve 21 also has an internal thread, and the outer surface of the rotating block 23 has an external thread that matches the internal thread. The driving disk 24 has a mounting step 25, which is inserted into the sleeve 21. The driving disk 24 extends out of the sleeve 21, and the mounting step 25 is connected to the inner wall of the sleeve 21 through a bearing. A plurality of sliding rods 26 are transversely arranged on the outer side surface of the rotating block 23, and the inner side surface of the rotating block 23 is connected to the outer side surface of the slider 22 through a plane bearing. The driving disk 24 is provided with guide holes 27 corresponding to each sliding rod 26, and the sliding rod 26 is slidably connected in the corresponding guide holes 27;

[0023] A wire threading hole 28 is provided in the middle of the slider 22, and a steel strand clamping device capable of fixing the steel strand inserted in the wire threading hole is provided on the slider 22.

[0024] By rotating the drive disk 24, the rotating block 23 is translated in the sleeve 21 under the cooperation of the internal thread and the external thread, pushing or pulling the slider 22 to translate under the action of the internal spline and the external spline, so that the slider 22 fixed with the steel strand can be pulled or loosened, thereby adjusting the preload force of the steel strand.

[0025] The equipment uniformly fixes the basic positions of the steel strands through multiple tensioners, that is, multiple tensioners are fixed through a base 1, and then each steel strand is individually controlled through each tensioner, which can greatly reduce labor intensity and controllability.

[0026] In the present device, the slider 22 on which the steel strand is fixed is controlled and adjusted by rotating the thread, which can greatly reduce the strength of the force pulling the steel strand, and the larger diameter drive disk 24 is further designed to save effort, so that the operation of driving the steel strand to be tightened can be completed by manpower, and it is not necessary to use hydraulic equipment or electrical equipment. In this way, the reliability of the bridge construction process can be greatly improved, the dependence on environmental conditions and equipment conditions during the construction process can be avoided, and the construction accidents and construction risks caused by the uncontrollability of external equipment such as hydraulic equipment can be eliminated.

[0027] like Figure 2 and Figure 3As shown, the steel strand clamping device includes an annular slot 31 provided on the outer side of the slider 22, the outer edge of the slot 31 has a step surface 32, and the steel strand clamping device also includes a clamping block 33, the clamping block 33 has a plug 34 corresponding to the slot 31 and a retaining ring 35 corresponding to the step surface 32, the retaining ring 35 and the step surface 32 are connected by a tension spring 36; a boss 37 is formed between the slot 31 and the threading hole 28, a plurality of sliding holes 38 are evenly provided on the axis of the boss 37, a pressing block 39 is slidably connected in the sliding hole 38, the outer side of the pressing block 39 has a protrusion 391, and the inner side of the pressing block 39 has an "eight"-shaped pressing claw 392; the plug 34 can squeeze the protrusion 391 and make the pressing claw 392 rest against the steel strand in the threading hole 28.

[0028] A hollow pull rod 41 is fixedly provided on the outer surface of the clamping block 33 . A positioning hole 42 which is in the same straight line as the threading hole 28 is formed at the outer end of the pull rod 41 . An end cap 43 is threadedly connected to the outer end of the pull rod 41 .

[0029] The end of the steel strand is located on the outer side of the pull rod 41 in a bent manner, and the end of the steel strand is fixed by pressing the end cover 43, making the fixation of the steel strand more reliable.

[0030] When inserting the steel strand, the pull rod 41 can be pulled outward to move the plug 34 away from the slot 31 to prevent the clamping block 39 from obstructing the insertion of the steel strand. When the steel strand is inserted to the appropriate position, the pull rod 41 is released, and under the action of the tension spring 36, the plug is inserted into the slot 31, so that the clamping block 39 clamps the steel strand.

[0031] By fixing the steel strand twice, that is, the end is fixed by the end cover 43, and the inner part is clamped by the clamping block 39, the clamping of the steel strand is made more reliable. At the same time, since the steel strand is pulled, the clamping block 33 is driven to move in the direction of the slider 22, so that the plug 34 exerts a greater force on the clamping block 39, thereby making the clamping of the steel strand more stable. That is, when the steel strand is subjected to external forces, or when stress and bearing force are caused to the steel strand during construction, the clamping of the steel strand will become more and more firmly.

[0032] The slide hole 38 is in the shape of an I-shaped character, and the pressing claw 392 is detachably connected to the protrusion 391. The slide hole 38 is in the shape of an I-shaped character, which can ensure that the pressing block 39 will not fall out of the slider 22, and the two parts of the pressing block 39 are detachably connected, so that the pressing block 39 can be easily installed in the slide hole 38.

[0033] Among them, the outer end of the pressing claw 392 has a cylindrical connecting head, the connecting head has a threaded hole, the inner section of the protrusion 391 has a pin, the pin is threaded in the threaded hole, the connecting head is slidably connected to the middle section of the sliding hole 38, the protrusion 391 can be retracted in the outer section of the sliding hole 38, the pressing claw 392 can be retracted in the inner section of the sliding hole 38, when the steel strand is inserted, the protrusion 391 extends outward, and the pressing claw 392 retracts to the inner section of the sliding hole 38 to facilitate the insertion of the steel strand. When the plug 34 is inserted, the protrusion 391 moves inward, and the pressing claw 392 moves synchronously to clamp the steel strand.

[0034] A plurality of force blocks 5 are evenly arranged on the outer peripheral surface of the driving disk 24. The force blocks 5 can be used for external wrenches, steel pipes, etc., so that the operation of the driving disk 24 rotation is more labor-saving.

[0035] A plurality of locking holes 61 are evenly distributed circumferentially on the outer side of the sleeve 21, and a locking bolt 62 is threadedly connected to the driving disc 24, and the locking bolt 62 can be inserted into the locking hole 61. After the position of the driving disc 24 is adjusted, the position of the driving disc 24 and the sleeve 21 can be fixed by the locking bolt 62, thereby avoiding misoperation or loosening under the tension of the steel strand.

[0036] A mounting plate 11 is provided at the bottom of the base 1, and a plurality of ground piles 12 are threadedly connected to the mounting plate 11, and the mounting plate 11 can be fixed on the ground through the ground piles 12. The mounting plate 11 is fixed on the ground through the ground piles 12. Since the tensioning duration of the steel strand is relatively long, each tensioner can be made more reliable by ground fixing. Moreover, by the unified fixing method, not only the stability can be improved, but also the labor intensity can be reduced. Compared with the method of fixing the jacks one by one, the unified fixing of the mounting plate 11 can save time and labor.

[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A steel strand clamping device for a bridge prestressing tensioning device, characterized in that: The steel strand clamping device comprises a slider (22) and an annular slot (31) provided on the outer side of the slider (22), the outer edge of the slot (31) having a step surface (32), and the steel strand clamping device further comprises a clamping block (33), the clamping block (33) having a plug (34) corresponding to the slot (31) and a retaining ring (35) corresponding to the step surface (32), the retaining ring (35) and the step surface (32) being connected via a tension spring (36); the slot (31 ) and the threading hole (28), a boss (37) is formed between the boss (37), a plurality of sliding holes (38) are evenly arranged on the axis thereof, a pressing block (39) is slidably connected in the sliding hole (38), the outer side of the pressing block (39) has a protrusion (391), and the inner side of the pressing block (39) has an "eight"-shaped pressing claw (392); the plug (34) can squeeze the protrusion (391) and make the pressing claw (392) abut against the steel strand in the threading hole (28); The sliding hole (38) is in the shape of an "I" character, and the pressing claw (392) is detachably connected to the protrusion (391); the outer end of the pressing claw (392) has a cylindrical connecting head, and the connecting head has a threaded hole. The inner section of the protrusion (391) has a pin, and the pin is threadedly connected in the threaded hole. The connecting head is slidably connected to the middle section of the sliding hole (38). The protrusion (391) can be retracted in the outer section of the sliding hole (38), and the pressing claw (392) can be retracted in the inner section of the sliding hole (38). When the steel strand is inserted, the protrusion (391) extends outward and the pressing claw (392) retracts to the inner section of the sliding hole to facilitate the insertion of the steel strand. When the plug is inserted, the protrusion (391) moves inward, and the pressing claw (392) moves synchronously to clamp the steel strand.

2. According to claim 1, a steel strand clamping device for a bridge prestressing tensioning device is characterized in that: A hollow pull rod (41) is fixedly provided on the outer surface of the clamping block (33), and a positioning hole (42) which is in the same straight line as the threading hole (28) is formed at the outer end of the pull rod (41), and an end cover (43) is threadedly connected to the outer end of the pull rod (41).

Images