Prestress tensioning support for rigid frame bridge

Abstract

The utility model belongs to the technical field of bridge construction, and discloses a rigid frame bridge prestress tensioning support which comprises two pieces of channel steel, the two pieces of channel steel are arranged in the vertical direction, rectangular grooves are formed in the outer side faces of the channel steel, and driving seats are arranged in the two pieces of channel steel. The outer sides of the two driving seats extend outwards to penetrate through the rectangular grooves to be in threaded connection with first screw rods, a connecting shaft is fixedly connected between the two driving seats, a fixing mechanism is rotationally connected to the connecting shaft and comprises a cylindrical fixing seat, a plurality of through holes are formed in the cylindrical fixing seat in the circumferential direction, and the through holes are communicated with the first screw rods. A through hole is formed in the middle of the cylindrical fixing base, clamping blocks are arranged at the two ends of the through hole, the inner side face of one clamping block is rotationally connected with a second screw rod, and the other end of the second screw rod penetrates through the other clamping block and is in threaded connection with the other clamping block. The inclination angle of the steel strand is adjusted through tensioning, so that the difference value between the actual prestress and the designed prestress is reduced.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of bridge construction, and particularly relates to a prestressed tensioning bracket for a rigid-frame bridge. Background Art

[0002] In the construction of bridges, it is necessary to thread steel strands into the prestressed pipes of the bridges, and then use a tensioning device to stretch the steel strands. After stretching, tapered wedge grips are sleeved on the steel strands. By utilizing the rebound of the steel strands after being released, the tapered wedge grips are inserted into the holes of the embedded anchor pads to tension the steel strands. This method requires applying a greater force than the designed prestress to stretch the steel strands, and it is rather difficult to generate the tension force.

[0003] However, after tensioning with the existing bridge prestressed tensioning devices, the steel strands will have a certain amount of rebound. After the steel strands rebound, the prestress exerted by the steel strands on the bridge often has a large difference from the designed prestress, which will inevitably have a great impact on the project quality. How to reduce the difference between the actual prestress and the designed prestress is an issue that has been discussed in engineering. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the present disclosure is to provide a prestressed tensioning bracket for a rigid-frame bridge, which reduces the difference between the actual prestress and the designed prestress by tensioning and adjusting the inclination angle of the steel strands.

[0005] The purpose of the present disclosure can be achieved through the following technical solutions:

[0006] A prestressed tensioning bracket for a rigid-frame bridge, comprising:

[0007] Two channel steels are arranged vertically. Rectangular grooves are formed on the outer sides of the channel steels. Driving seats are arranged inside both channel steels. The outer sides of the two driving seats extend outward through the rectangular grooves and are threadedly connected with first screws. A connecting shaft is fixedly connected between the two driving seats, and a fixing mechanism is rotatably connected to the connecting shaft.

[0008] The fixing mechanism includes a cylindrical fixing seat. A plurality of through holes are formed in the cylindrical fixing seat along the circumferential direction. A through hole is formed in the middle of the cylindrical fixing seat. Clamping blocks are arranged at both ends of the through hole. A second screw is rotatably connected to the inner side of one of the clamping blocks, and the other end of the second screw passes through the other clamping block and is threadedly connected thereto.

[0009] The above technical solution, its principle and technical effect:

[0010] After passing several steel strands through the corresponding perforations and turning them back inside the through-hole, rotate the second screw rod to make the two clamping blocks move towards each other. The side surfaces of the clamping blocks continuously squeeze the steel strands inside the through-hole to fix the steel strands. Drive the first screw rod to rotate. The first screw rod drives the driving seat to move. The driving seat drives the connecting shaft to move. The connecting shaft drives the cylindrical fixing seat to move. Adjust the inclination angle of the steel strands through tensioning to reduce the difference between the actual prestress and the designed prestress.

[0011] Furthermore, several rollers are rotatably connected to the periphery of the driving seat, and the rollers are in rolling connection inside the channel steel.

[0012] Furthermore, a connecting plate is fixedly connected to the outer side surface of the driving seat. The connecting plate passes through the rectangular groove and is in threaded connection with the first screw rod.

[0013] Furthermore, a fixing plate is fixedly connected to the upper end of the channel steel, and a base is fixedly connected to the lower end of the channel steel.

[0014] Furthermore, the upper end of the first screw rod is rotatably connected to the fixing plate, and the lower end of the first screw rod is rotatably connected to the base.

[0015] Furthermore, a first bevel gear is fixedly connected to the lower end of the first screw rod. The first bevel gear meshes with a second bevel gear. The two second bevel gears are fixedly connected to the output ends of a bidirectional motor, and the bidirectional motor is fixedly connected inside the base.

[0016] Furthermore, an ear plate is fixedly connected to the upper end of the cylindrical fixing seat, and the ear plate is rotatably connected to the connecting shaft.

[0017] Furthermore, reinforcing rods are fixedly connected to both sides of the channel steel, and the lower ends of the reinforcing rods are fixedly connected to the base.

[0018] Furthermore, the inner diameter of the through-hole gradually decreases from both ends to the middle, and the outer diameter of the clamping block gradually decreases from the outside to the inside.

[0019] Furthermore, a rotating rod is fixedly connected to the end of the second screw rod.

[0020] Regarding the nouns, conjunctions or adjectives involved in the above technical solutions, the explanations are as follows:

[0021] Fixed connection means that after fixing parts or components, there is no relative movement connection. It is divided into two types: detachable connection and non-detachable connection.

[0022] (1) Detachable connection uses screws, splines, wedge pins, etc. to fix components together. This connection method can be disassembled during maintenance and will not damage the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedge pins), and they must be tightened properly.

[0023] (2) Non-detachable connections mainly refer to welding, riveting, and mortise fitting, etc. Since for disassembly, forging, sawing, or oxygen cutting is required during maintenance or replacement, the spare parts generally cannot be reused. Meanwhile, during connection, attention should be paid to the process quality, technical inspection, and remedial measures (such as correction, polishing, etc.).

[0024] Threaded connection refers to a detachable connection that connects the connected parts into one body with threaded parts (or the threaded parts of the connected parts).

[0025] Sliding connection means that two objects are in contact but not fixed, and they can slide relative to each other.

[0026] Rotational connection means that the connection between parts enables the parts to rotate relative to each other.

[0027] Advantages of the present disclosure:

[0028] By tensioning to adjust the inclination angle of the steel strand, the difference between the actual prestress and the designed prestress is reduced. Description of the drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is the overall structural schematic diagram of the embodiment of the present disclosure;

[0031] Figure 2 is the structural schematic diagram of the fixing mechanism of the embodiment of the present disclosure;

[0032] Figure 3 is the structural schematic diagram of the cylindrical fixing seat of the embodiment of the present disclosure;

[0033] Figure 4 is the structural schematic diagram of the clamping block of the embodiment of the present disclosure;

[0034] Figure 5 is the structural schematic diagram of driving the first screw to rotate in the embodiment of the present disclosure. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present disclosure.

[0036] In the description of the present disclosure, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationship are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure.

[0037] According to the concept of the present application, an embodiment of a prestressed tensioning bracket for a rigid-frame bridge is described herein in conjunction with Figures 1 to 5 Specifically, the prestressed tensioning bracket for a rigid-frame bridge is configured as a split structure, which has components such as channel steel 1 and fixing mechanism 6. Through the mutual cooperation of structures such as driving seat 3, first screw 4, cylindrical fixing seat 7, clamping block 10, etc., several steel strands pass through the corresponding through holes 8 and then turn back from the through hole 9. Rotate the second screw 11 to make the two clamping blocks 10 move towards each other. The side surfaces of the clamping blocks 10 continuously squeeze the steel strands in the through hole 9 to fix the steel strands. Drive the first screw 4 to rotate. The first screw 4 drives the driving seat 3 to move. The driving seat 3 drives the connecting shaft 5 to move. The connecting shaft 5 drives the cylindrical fixing seat 7 to move. By tensioning and adjusting the inclination angle of the steel strands, the difference between the actual prestress and the designed prestress is reduced.

[0038] As Figures 1-5 shown, a prestressed tensioning bracket for a rigid-frame bridge includes:

[0039] Two channel steels 1 are arranged vertically. A rectangular groove 2 is provided on the outer side surface of the channel steel 1. Driving seats 3 are arranged in both channel steels 1. The outer sides of the two driving seats 3 extend outward through the rectangular groove 2 and are threadedly connected with a first screw 4. A connecting shaft 5 is fixedly connected between the two driving seats 3. A fixing mechanism 6 is rotatably connected to the connecting shaft 5.

[0040] The fixing mechanism 6 includes a cylindrical fixing seat 7. A plurality of through holes 8 are provided on the cylindrical fixing seat 7 along the circumferential direction. A through hole 9 is provided in the middle of the cylindrical fixing seat 7. Clamping blocks 10 are provided at both ends of the through hole 9. The inner side surface of one of the clamping blocks 10 is rotatably connected with a second screw 11. The other end of the second screw 11 passes through the other clamping block 10 and is threadedly connected thereto.

[0041] During use, several steel strands pass through the corresponding through holes 8 and then turn back from the through hole 9. Rotate the second screw 11 to make the two clamping blocks 10 move towards each other. The side surfaces of the clamping blocks 10 continuously squeeze the steel strands in the through hole 9 to fix the steel strands. Drive the first screw 4 to rotate. The first screw 4 drives the driving seat 3 to move. The driving seat 3 drives the connecting shaft 5 to move. The connecting shaft 5 drives the cylindrical fixing seat 7 to move. By tensioning and adjusting the inclination angle of the steel strands, the difference between the actual prestress and the designed prestress is reduced.

[0042] A screw is a cylinder with a helical groove cut on its outer surface or a cone with a conical helical groove cut. The screw has different heads, and the head is called an external hexagonal screw. There are also others, such as large flat screws, internal hexagonal screws, and so on.

[0043] In an embodiment of the present utility model, a plurality of rollers 12 are rotatably connected to the periphery of the driving seat 3, and the rollers 12 are in rolling connection with the channel steel 1. This makes the movement of the driving seat 3 more stable and reduces the friction force.

[0044] In an embodiment of the present utility model, a connecting plate 13 is fixedly connected to the outer side surface of the driving seat 3, and the connecting plate 13 passes through the rectangular groove 2 and is threadedly connected to the first screw rod 4. This facilitates driving the movement of the driving seat 3.

[0045] In an embodiment of the present utility model, a fixing plate 14 is fixedly connected to the upper end of the channel steel 1, and a base 15 is fixedly connected to the lower end of the channel steel 1.

[0046] In an embodiment of the present utility model, the upper end of the first screw rod 4 is rotatably connected to the fixing plate 14, and the lower end of the first screw rod 4 is rotatably connected to the base 15.

[0047] In an embodiment of the present utility model, a first bevel gear 16 is fixedly connected to the lower end of the first screw rod 4, the first bevel gear 16 meshes with a second bevel gear 17, two second bevel gears 17 are fixedly connected to the output end of a bidirectional motor 18, and the bidirectional motor 18 is fixedly connected inside the base 15. The bidirectional motor 18 drives the two second bevel gears 17 to rotate, the second bevel gears 17 drive the first bevel gear 16 to rotate, and the first bevel gear 16 drives the first screw rod 4 to rotate.

[0048] In an embodiment of the present utility model, an ear plate 22 is fixedly connected to the upper end of the cylindrical fixing seat 7, and the ear plate 22 is rotatably connected to the connecting shaft 5. This facilitates the rotation of the cylindrical fixing seat 7 around the connecting shaft 5.

[0049] In an embodiment of the present utility model, reinforcing rods 23 are fixedly connected to both sides of the channel steel 1, and the lower ends of the reinforcing rods 23 are fixedly connected to the base 15. This improves the overall structural strength of the bracket.

[0050] In an embodiment of the present utility model, the inner diameter of the through hole 9 gradually decreases from both ends to the middle, and the outer diameter of the clamping block 10 gradually decreases from the outside to the inside. With such a design, the clamping block 10 cooperates with the through hole 9 to squeeze and fix the steel strand.

[0051] In an embodiment of the present utility model, a rotating rod 24 is fixedly connected to the end of the second screw rod 11. This facilitates the rotation of the second screw rod 11.

[0052] The following further describes a prestressed tensioning bracket for a rigid frame bridge provided by the present utility model in conjunction with the accompanying drawings and embodiments.

[0053] A prestressed tensioning bracket for a rigid frame bridge includes:

[0054] Two channel steels 1 are arranged vertically. A rectangular groove 2 is formed on the outer side surface of the channel steel 1. Driving seats 3 are arranged in both channel steels 1. The outer sides of the two driving seats 3 extend outward through the rectangular groove 2 and are threadedly connected with first screws 4. A connecting shaft 5 is fixedly connected between the two driving seats 3. A fixing mechanism 6 is rotatably connected to the connecting shaft 5.

[0055] The fixing mechanism 6 includes a cylindrical fixing seat 7. A plurality of through holes 8 are formed in the cylindrical fixing seat 7 along the circumferential direction. A through hole 9 is formed in the middle of the cylindrical fixing seat 7. Clamping blocks 10 are arranged at both ends of the through hole 9. A second screw 11 is rotatably connected to the inner side surface of one of the clamping blocks 10. The other end of the second screw 11 passes through the other clamping block 10 and is threadedly connected thereto.

[0056] A plurality of rollers 12 are rotatably connected to the periphery of the driving seat 3. The rollers 12 are in rolling connection within the channel steel 1.

[0057] A connecting plate 13 is fixedly connected to the outer side surface of the driving seat 3. The connecting plate 13 passes through the rectangular groove 2 and is threadedly connected with the first screw 4.

[0058] A fixing plate 14 is fixedly connected to the upper end of the channel steel 1. A base 15 is fixedly connected to the lower end of the channel steel 1.

[0059] The upper end of the first screw 4 is rotatably connected to the fixing plate 14. The lower end of the first screw 4 is rotatably connected to the base 15.

[0060] A first bevel gear 16 is fixedly connected to the lower end of the first screw 4. The first bevel gear 16 meshes with a second bevel gear 17. The two second bevel gears 17 are fixedly connected to the output end of a bidirectional motor 18. The bidirectional motor 18 is fixedly connected within the base 15.

[0061] An ear plate 22 is fixedly connected to the upper end of the cylindrical fixing seat 7. The ear plate 22 is rotatably connected to the connecting shaft 5.

[0062] Reinforcing rods 23 are fixedly connected to both sides of the channel steel 1. The lower ends of the reinforcing rods 23 are fixedly connected to the base 15.

[0063] The inner diameter of the through hole 9 gradually decreases from both ends to the middle. The outer diameter of the clamping block 10 gradually decreases from the outside to the inside.

[0064] A rotating rod 24 is fixedly connected to the end of the second screw 11.

[0065] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above shows and describes the basic principles, main features and advantages of the present disclosure. Those skilled in the art of this industry should understand that the present disclosure is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure will have various changes and improvements, and these changes and improvements all fall within the scope of the present disclosure claimed.

Claims

1. A prestressed tension support for a rigid frame bridge, characterized in that: include: Two channel steels (1), the two channel steels (1) are arranged vertically, the outer side of the channel steel (1) is provided with a rectangular groove (2), the two channel steels (1) are both provided with a driving seat (3), the outer sides of the two driving seats (3) extend outward through the rectangular groove (2) and are threadedly connected with a first screw rod (4), a connecting shaft (5) is fixedly connected between the two driving seats (3), and a fixing mechanism (6) is rotatably connected to the connecting shaft (5), The fixing mechanism (6) comprises a cylindrical fixing seat (7), the cylindrical fixing seat (7) is provided with a plurality of through holes (8) along the circumferential direction, a through hole (9) is provided in the middle of the cylindrical fixing seat (7), clamping blocks (10) are arranged at both ends of the through hole (9), the inner side surface of one of the clamping blocks (10) is rotatably connected to a second screw rod (11), and the other end of the second screw rod (11) passes through another clamping block (10) and is threadedly connected thereto.

2. The prestressed tensioning bracket for a rigid frame bridge according to claim 1, characterized in that: The driving seat (3) is rotatably connected to a plurality of rollers (12) on its periphery, and the rollers (12) are rollingly connected in the channel steel (1).

3. The prestressed tensioning support for a rigid frame bridge according to claim 2, characterized in that: A connecting plate (13) is fixedly connected to the outer side surface of the driving seat (3), and the connecting plate (13) passes through the rectangular groove (2) and is threadedly connected to the first screw rod (4).

4. The prestressed tensioning support for a rigid frame bridge according to claim 3, characterized in that: The upper end of the channel steel (1) is fixedly connected to a fixing plate (14), and the lower end of the channel steel (1) is fixedly connected to a base (15).

5. The prestressed tensioning support for a rigid frame bridge according to claim 4, characterized in that: The upper end of the first screw rod (4) is rotatably connected to the fixing plate (14), and the lower end of the first screw rod (4) is rotatably connected to the base (15).

6. The prestressed tensioning support for a rigid frame bridge according to claim 5, characterized in that: The lower end of the first screw rod (4) is fixedly connected to a first bevel gear (16), the first bevel gear (16) is meshed with a second bevel gear (17), and the two second bevel gears (17) are fixedly connected to the output end of a bidirectional motor (18), and the bidirectional motor (18) is fixedly connected in the base (15).

7. The prestressed tensioning support for a rigid frame bridge according to claim 6, characterized in that: The upper end of the cylindrical fixing seat (7) is fixedly connected with an ear plate (22), and the ear plate (22) is rotatably connected to the connecting shaft (5).

8. The prestressed tensioning support for a rigid frame bridge according to claim 1, characterized in that: Reinforcement rods (23) are fixedly connected to both sides of the channel steel (1), and the lower ends of the reinforcement rods (23) are fixedly connected to the base (15).

9. The prestressed tension support for a rigid frame bridge according to claim 1, characterized in that: The inner diameter of the through hole (9) gradually decreases from both ends to the middle, and the outer diameter of the clamping block (10) gradually decreases from the outside to the inside.

10. The prestressed tension support for a rigid frame bridge according to claim 1, characterized in that: The end of the second screw rod (11) is fixedly connected to a rotating rod (24).

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