A tension frame

Abstract

The present invention relates to the technical field of precast beam construction, and more specifically, to a tensioning frame comprising a rear anchor beam, a reaction column, a diagonal strap, an upper tensile steel box beam, and a lower tensile steel box beam. The upper tensile steel box beam and the lower tensile steel box beam are connected to the upper and lower ends of the reaction column respectively through jacks. One end of the diagonal strap is connected to the reaction column, and the other end is connected to the rear anchor beam. The rear anchor beam is obliquely arranged on a certain support surface. The rear anchor beam, the reaction column, and the diagonal strap are compressive components when the steel strand is in tension, so the components meet the requirements of compressive bearing capacity. When the steel strand is in a taut state, the rear anchor beam, the reaction column, the diagonal strap, the tensile steel box beam, and the pedestal participate in the force together to resist the overturning bending moment caused by the tensioning force. This effectively avoids problems such as cracking, twisting, and deformation of the precast beam after tensioning, and ensures construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated beam construction, in particular to a tensioning frame. Background Art

[0002] Traditional pre-tensioning reaction systems such as Figure 7 As shown, a trough-type pedestal structure is employed, consisting of reinforced concrete load-transmitting columns, fixed crossbeams (tensioning end), fixed crossbeams (anchoring end), and movable crossbeams. During tensioning, jacks push the movable crossbeams to tension the steel strands. Once the prestress reaches the design requirements, anchoring is accomplished using clamps. Subsequent work, including precast beam reinforcement binding, formwork installation, and concrete pouring, proceeds. Once the beam is poured and the concrete has reached a certain strength, tension is released using jacks. Prior to tensioning, jacks are pre-placed between the load-bearing support at the fixed end of the pedestal and the crossbeam. First, the jack stress is adjusted to slightly greater than 100% σcon, the locking nut is loosened, and then the jack stress is slowly adjusted in stages. Both jacks are simultaneously retracted, allowing the tensioned prestressed tendons to gradually retract until all strand stress is eliminated. The fixed and movable crossbeams must remain parallel. The specific procedures are the same as for tensioning, achieving beam tension release.

[0003] Traditional pre-tensioned reaction support systems require high overall rigidity, high anti-overturning capacity, high compressive strength, and high foundation bearing capacity. The process is complex, requiring large quantities of earthwork beams and materials, resulting in low assembly efficiency and turnover. The force transfer columns act as compressive members when the strands are in tension. Therefore, the component dimensions must meet the required compressive bearing capacity, while also ensuring that the height of the columns above the ground is not too high. While excessive height can improve the bearing capacity of the pedestal (by reducing the slenderness ratio and eccentricity of the compression bars), it can also cause difficulties in rebar placement, formwork support, and concrete pouring.

[0004] The traditional pre-tensioning reaction support system has the following quality risks: because the force transfer column is a slender component, the construction straightness affects the performance of the prefabrication site. The construction quality of the force transfer column is related to the production and personal safety of the entire prefabrication site. After the construction of the ultra-long force transfer column, the prefabricated beam is prone to transverse cracks, and there is a risk of damage during the tensioning process, which will cause the linear characteristics of the beam to be destroyed, the structural dimensions to deviate, and quality defects to occur, affecting the appearance quality assessment of the beam. Summary of the Invention

[0005] The purpose of the present invention is to provide a tensioning frame to solve the problem in the prior art that prefabricated beams are easily damaged during the construction process.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A tensioning frame includes a rear anchor beam, a reaction column, a diagonal belt, an upper tensile steel box beam and a lower tensile steel box beam, wherein the upper tensile steel box beam and the lower tensile steel box beam are respectively connected to the upper and lower ends of the reaction column through jacks, one end of the diagonal belt is connected to the reaction column, and the other end is connected to the rear anchor beam, the rear anchor beam is obliquely arranged on a certain supporting surface, and the upper tensile steel box beam and the lower tensile steel box beam are used to be connected to a prefabricated pedestal through steel strands.

[0008] In one embodiment of the present invention, a steel box boom is provided at the top of the reaction column, and the cylinder box boom is connected to the upper tensile steel box beam through a boom bolt. A hanger is provided in the middle of the reaction column, and the hanger is connected to the lower tensile steel box beam through a boom bolt.

[0009] In one embodiment of the present invention, a ball bowl seat is provided on one side of the reaction column, and the ball bowl seat is used to be connected to the pedestal. A connecting plate is connected to the bottom of the reaction column, and the connecting plate is connected to the supporting surface through anchor bolts. A flat pad is provided between the connecting plate and the supporting surface.

[0010] In one embodiment of the present invention, a sliding device is connected to the bottom of the rear anchor beam, and the sliding device includes a power device, a sliding platform and a sliding mechanism. The sliding mechanism is arranged at the bottom of the rear anchor beam, and the sliding mechanism moves on the sliding platform through the power device. An abutment device is provided on one side of the rear anchor beam, and the rear anchor beam slides on the abutment device. The clamping mechanism is used to clamp the rear anchor beam.

[0011] In one embodiment of the present invention, the sliding mechanism includes an articulated seat, a connecting plate and a rack, the rack is arranged at the bottom of the connecting plate, the articulated seat is arranged on the connecting plate, and is connected to the bottom of the rear anchor beam through a connecting device.

[0012] In one embodiment of the present invention, the connecting device includes a connecting frame and a number of connecting brackets, the connecting frame is fixedly arranged on the upper part of the hinged seat, the bottom of the connecting frame and the rear anchor beam are both provided with through holes, the connecting bracket includes two cross-arranged support rods, both ends of the support rods are respectively provided with connecting parts, the connecting parts are provided with corresponding through holes, the support rods are located in the connecting frame, and are connected to the connecting frame and the rear anchor beam by bolts and nuts.

[0013] In one embodiment of the present invention, the power device includes a motor, a reducer and a gear, the motor is connected to the output end of the reducer, the reducer is connected to the gear, and the gear is meshed with the rack.

[0014] In one embodiment of the present invention, fixing devices for fixing the connecting plates are further provided on both sides of the connecting plates, the fixing devices include several groups of first hydraulic cylinders, and the connecting plates are provided with several through holes adapted to the telescopic ends of the hydraulic cylinders.

[0015] In one embodiment of the present invention, the clamping mechanism includes a plurality of second telescopic cylinders arranged on both sides of the rear anchor beam, and the telescopic ends of the second telescopic cylinders are provided with contact portions.

[0016] In one embodiment of the present invention, pulleys are connected to both sides of the connecting plate via connecting rods, a slide rail is provided on the connecting plate, and the pulley is located in the slide rail and moves.

[0017] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0018] During the pre-tensioning and release operations, the jacks push against the rear anchor beam, reaction column, diagonal strap, and tension steel box girder. These components become compressive members while the strands are in tension, thus meeting the required compressive bearing capacity. When the strands are taut, the rear anchor beam, reaction column, diagonal strap, tension steel box girder, and pedestal share the load-bearing function, resisting the overturning moment caused by the tensioning force. This effectively avoids cracking, twisting, and deformation of the precast beam after tensioning, ensuring construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0021] Figure 2 For the present invention Figure 1 A top view of

[0022] Figure 3 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the sliding device of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection between the connecting frame and the rear anchor beam of the present invention;

[0025] Figure 6 For the present invention Figure 3Enlarged view of point A in the middle;

[0026] Figure 7 Schematic diagram of the prior art.

[0027] Icons: 1-cable belt, 2-rear anchor beam, 3-lower tensile steel box beam, 4-anchor bolt, 5-ball bowl seat, 6-reaction column, 7-steel strand, 8-jack, 9-steel box boom, 10-upper tensile steel box beam, 11-hanger, 12-abutment device, 13-second telescopic cylinder, 14-connecting frame, 15-articulated seat, 16-connecting plate, 17-connecting rod, 18-sliding platform, 19-rack, 20-motor, 21-reducer, 22-gear, 23-first hydraulic cylinder, 24-pulley, 25-connecting bracket. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Example 1:

[0030] Please refer to Figure 1-Figure 2 The present invention provides a tensioning frame, which mainly includes a rear anchor beam 2, a reaction column 6, a diagonal belt 1, an upper tensile steel box beam 10 and a lower tensile steel box beam 3.

[0031] The upper tensile steel box girder 10 and the lower tensile steel box girder 3 are respectively connected to the upper and lower ends of the reaction column 6 through jacks 8. The jacks 8 are locked jacks 8, wherein the length of the locked jacks 8 is preferably 620 mm and the diameter is 400 mm. The dimensions of the upper tensile steel box girder 10 and the lower tensile steel box girder 3 are preferably 500 mm. The two jacks 8 are respectively connected between the upper tensile steel box girder 10 and the reaction column 6, and between the lower tensile steel box girder 3 and the reaction column 6. The height of the reaction column 6 is preferably 2460 mm and the width is 460 mm.

[0032] Steel strands 7 are connected to both the upper tensile steel box girder 10 and the lower tensile steel box girder 3. One end of the strand 7 is fixed to one end of the upper tensile steel box girder 10 or the lower tensile steel box girder 3 via a tool anchor, and the other end is connected to the prefabricated pedestal. The tool anchor is 55 mm wide. The steel strands 7 connected to the upper tensile steel box girder 10 are divided into center beam steel strands 7 and side beam steel strands 7. Twelve center beam steel strands 7 are used, with an average angle of 84.6 degrees between them and the counter-columns. Fourteen side beam steel strands 7 are used, with an average angle of 84.7 degrees between them and the counter-columns. Preferably, 20 strands 7 are used to connect to the lower tensile steel box girder 3.

[0033] One end of the diagonal belt 1 is connected to the reaction column 6, and the other end is connected to the rear anchor beam 2. In this embodiment, the diagonal belt 1 preferably has an angle of 30 degrees with the ground. The distance between the connection point of the diagonal belt 1 and the rear anchor beam 2 and the reaction column 6 is preferably 3355 mm, and the distance between the connection point of the diagonal belt 1 and the rear anchor beam 2 and the nearest end of the diagonal belt 1 is preferably 860 mm. Conventional bolts can be used to connect the diagonal belt 1 and the rear anchor beam 2. The distance between the bolts and the side of the diagonal belt 1 is preferably 90 mm. The rear anchor beam is obliquely set underground. The oblique setting can help the rear anchor beam 2 to be more stable.

[0034] With the above-mentioned structure of the present invention, the upper jacks 8 achieve the tensioning and release requirements of the upper steel strands 7 by counter-acting the upper tensile steel box girder 10 and the reaction column 6. The lower jacks 8 achieve the tensioning and release requirements of the lower steel strands 7 by counter-acting the lower tensile steel box girder 3 and the reaction column 6. During the pre-tensioning and release operations, the jacks 8 push against the rear anchor beam 2, the reaction column 6, the diagonal strap 1, and the tensile steel box girder. These components become compressive members when the steel strands 7 are in tension, thus meeting the compressive bearing capacity requirements. When the steel strands 7 are taut, the rear anchor beam 2, the reaction column 6, the diagonal strap 1, the tensile steel box girder, and the pedestal share the load, resisting the overturning bending moment caused by the tensioning force. This effectively avoids cracking, twisting, and deformation of the precast beams after tensioning, ensuring construction quality.

[0035] In this embodiment, a steel box boom 9 is provided on the top of the reaction column 6, and the cylinder box boom is connected to the upper tensile steel box beam 10 through a boom bolt. The boom bolt and the steel box boom 9 have a certain movable space, and the steel box boom 9 can provide a certain support to the upper tensile steel box beam 10. A hanger 11 is provided in the middle of the reaction column 6, and the hanger 11 is connected to the lower tensile steel box beam 3 through a boom bolt. The boom bolt and the hanger 11 also have a movable space, so that the jack 8 can achieve the purpose of tensioning the steel strand 7 when working, and the hanger 11 can provide a certain support to the lower tensile steel box beam 3.

[0036] In this embodiment, a ball bowl seat 5 is provided on one side of the reaction column 6, and the ball bowl seat 5 is used to connect with the pedestal. The ball bowl seat 5 is a spherical structure with an internal depression. A protruding spherical structure that adapts to the depression can be installed at the corresponding position of the pedestal, and then the connection is inlaid. The ball bowl seat 5 can play a certain connecting role while allowing a certain degree of freedom to avoid uneven force and breakage and damage. The bottom of the reaction column 6 is connected to a connecting plate 16, and the connecting plate 16 is connected to the supporting surface through anchor bolts 4. A flat pad layer is provided between the connecting plate 16 and the supporting surface, wherein the flat pad layer can be a fine stone bolt with a thickness of preferably 50 mm.

[0037] Example 2:

[0038] refer to Figure 1 , Figure 3-Figure 6 On the basis of Example 1, in the prior art, the rear anchor beam 2 is generally fixedly installed underground. If the posture of the rear anchor beam 2 needs to be adjusted during the construction of different pedestals and prefabricated beams, the entire rear anchor beam 2 is generally taken out and reinstalled, but this will undoubtedly increase the construction workload. Therefore, in order to improve a certain work efficiency, a sliding device is connected to the bottom of the rear anchor beam 2, and the sliding device includes a clamping mechanism, a power device, a sliding platform 18 and a sliding mechanism. The sliding mechanism is arranged at the bottom of the rear anchor beam 2, and the sliding mechanism is moved on the sliding platform 18 by the power device. An abutment device 12 is provided on one side of the rear anchor beam 2, and the rear anchor beam 2 slides on the abutment device 12, wherein the abutment device 12 includes a support column and a pulley 24, the pulley 24 is rotatably connected to one end of the support column, and the other end is fixed to a certain support surface, and the clamping mechanism is used to clamp the rear anchor beam 2.

[0039] With the above structure, the clamping mechanism clamps the rear anchor beam 2 in the initial state to keep the rear anchor beam 2 stable. When the posture needs to be adjusted, the clamping mechanism is started to release the limit on the rear anchor beam 2, and then the power device is started to drive the sliding mechanism to start moving on the sliding platform 18. When the rear anchor beam 2 has the abutment device 12 on one side, the rear anchor beam 2 starts to rotate, and the angle and height of the rear anchor beam 2 relative to the horizontal plane begin to change. After adjusting to a suitable position, the clamping device is started to re-fix the rear anchor beam 2, thus completing the adjustment of the posture of the rear anchor beam 2 without the need to re-excavate the rear anchor beam 2, which reduces the amount of work to a certain extent.

[0040] In this embodiment, the sliding mechanism includes an articulated seat 15, a connecting plate 16, and a rack 19. The rack 19 is provided at the bottom of the connecting plate 16. The articulated seat 15 is provided on the connecting plate 16 and is connected to the bottom of the rear anchor beam 2 via a connecting device. The connecting device includes a connecting frame 14 and a plurality of connecting brackets 25. The connecting frame 14 can be fixedly provided on the upper portion of the articulated seat 15 by welding. Through holes are provided at the bottoms of the connecting frame 14 and the rear anchor beam 2. The connecting brackets 25 include two cross-arranged support rods. Considering the large force applied to the rear anchor beam 2, the use of the cross-structured connecting brackets 25 can further improve the connection strength. Connecting portions are provided at both ends of the support rods, each with a corresponding through hole. Bolts are simultaneously passed through the connecting portion, the rear anchor beam 2, and the connecting frame 14. Bolts are then installed at both ends of the bolts for fixing.

[0041] In an exemplary embodiment of the present invention, the power device includes a motor 20, a reducer 21 and a gear 22. The motor 20 is connected to the output end of the reducer 21, the reducer 21 is connected to the gear 22, and the gear 22 is meshed with the rack 19.

[0042] After the motor 20 is started, the power is output to the reducer 21. After the reducer 21 reduces speed and increases torque, it drives the gear 22 to rotate, and finally drives the connecting plate 16 to start moving forward or backward.

[0043] In one embodiment of the present invention, fixing devices for fixing the connecting plate 16 are further provided on both sides of the connecting plate 16. The fixing devices include several groups of first hydraulic cylinders 23. The first hydraulic cylinders 23 are fixedly provided on the connecting plate 16. The connecting plate 16 is provided with several through holes adapted to the telescopic ends of the hydraulic cylinders. After adjusting to a suitable position, the first hydraulic cylinders 23 are started until the telescopic ends of the first hydraulic cylinders 23 enter into the through holes to complete the limiting.

[0044] In one embodiment of the present invention, the clamping mechanism includes a plurality of second telescopic cylinders 13, and the plurality of second telescopic cylinders 13 are respectively arranged on both sides of the rear anchor beam 2. The telescopic ends of the second telescopic cylinders 13 are provided with contact parts, and the shape of the contact parts can be spherical or plate-shaped, preferably a shape that better fits the rear anchor beam 2. When the rear anchor beam 2 needs to be limited, the second telescopic cylinders 13 are started until the contact parts press the rear anchor beam 2.

[0045] In addition, in order to reduce the load of the rear anchor beam 2 on the power unit, pulleys 24 are connected on both sides of the connecting plate 16 through connecting rods 17. A slide rail is provided on the connecting plate 16, and the pulley 24 moves in the slide rail. The connecting rod 17 and the pulley 24 provide certain support to the rear anchor beam 2 and can roll to reduce friction.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tensioning frame, characterized in that; It comprises a rear anchor beam (2), a reaction column (6), a diagonal belt (1), an upper tensile steel box beam (10) and a lower tensile steel box beam (3), wherein the upper tensile steel box beam (10) and the lower tensile steel box beam (3) are respectively connected to the upper and lower ends of the reaction column (6) through jacks (8), one end of the diagonal belt (1) is connected to the reaction column (6), and the other end is connected to the rear anchor beam (2), the rear anchor beam (2) is obliquely arranged on a certain supporting surface, and the upper tensile steel box beam (10) and the lower tensile steel box beam (3) are used to be connected to a prefabricated pedestal through a steel strand (7); A ball bowl seat (5) is provided on one side of the reaction column (6), and the ball bowl seat (5) is used to be connected to the pedestal. A connecting plate (16) is connected to the bottom of the reaction column (6), and the connecting plate (16) is connected to the supporting surface through anchor bolts (4). A flat pad is provided between the connecting plate (16) and the supporting surface. The bottom of the rear anchor beam (2) is connected to a sliding device, the sliding device comprises a clamping mechanism, a power device, a sliding platform (18) and a sliding mechanism, the sliding mechanism is arranged at the bottom of the rear anchor beam (2), the sliding mechanism is moved on the sliding platform (18) by the power device, an abutment device (12) is arranged on one side of the rear anchor beam (2), the rear anchor beam (2) is located on the abutment device (12) and slides, and the clamping mechanism is used to clamp the rear anchor beam (2).

2. A tensioning frame according to claim 1, characterized in that: A steel box boom (9) is provided at the top of the reaction column (6), and the steel box boom (9) is connected to the upper tensile steel box beam (10) through a boom bolt. A hanger (11) is provided in the middle of the reaction column (6), and the hanger (11) is connected to the lower tensile steel box beam (3) through a boom bolt.

3. The tensioning frame according to claim 1, characterized in that: The sliding mechanism comprises an articulated seat (15), a connecting plate (16) and a rack (19), wherein the rack (19) is arranged at the bottom of the connecting plate (16), and the articulated seat (15) is arranged on the connecting plate (16) and connected to the bottom of the rear anchor beam (2) through a connecting device.

4. A tensioning frame according to claim 3, characterized in that: The connecting device comprises a connecting frame (14) and a plurality of connecting brackets (25), wherein the connecting frame (14) is fixedly arranged on the upper part of the hinge seat (15), and the bottoms of the connecting frame (14) and the rear anchor beam (2) are both provided with through holes, and the connecting brackets (25) comprise two cross-arranged support rods, and the two ends of the support rods are respectively provided with connecting parts, and the connecting parts are provided with corresponding through holes, and the support rods are located in the connecting frame (14) and are connected to the connecting frame (14) and the rear anchor beam (2) by bolts and nuts.

5. The tensioning frame according to claim 4, characterized in that: The power device comprises a motor (20), a reducer (21) and a gear (22), wherein the motor (20) is connected to the output end of the reducer (21), the reducer (21) is connected to the gear (22), and the gear (22) is meshed with the rack (19).

6. The tensioning frame according to claim 5, characterized in that: Fixing devices for fixing the connecting plate (16) are also provided on both sides of the connecting plate (16), and the fixing devices include a plurality of groups of first hydraulic cylinders (23). The connecting plate (16) is provided with a plurality of through holes adapted to the telescopic ends of the hydraulic cylinders.

7. The tensioning frame according to claim 3, characterized in that: The clamping mechanism comprises a plurality of second telescopic cylinders (13) arranged on both sides of the rear anchor beam (2), and the telescopic ends of the second telescopic cylinders (13) are provided with contact parts.

8. The tensioning frame according to claim 3, characterized in that: Both sides of the connecting plate (16) are connected to pulleys (24) via connecting rods (17). A slide rail is provided on the connecting plate (16), and the pulley (24) moves in the slide rail.

Images