Self-balancing device and test method for main cable strand extrusion deformation test

Abstract

The present invention discloses a self-balancing device suitable for a main cable strand extrusion deformation test, comprising a support frame, a longitudinal beam, a support frame, a tensioning system, a hand chain hoist, a reaction frame, and a pressure plate; two support bodies are respectively arranged vertically and spaced apart; the two support bodies are connected by the longitudinal beam; a tensioning system is arranged inside each support body, and the two tensioning systems are connected to the cable strand; the reaction frame has a bottom closely attached to the top of the cable strand, and the reaction frame can be pulled downward against the cable strand by the hand chain hoist. The self-balancing device of the present invention utilizes the support frame and the card slot to more accurately fix the angle and boundary conditions of the cable strand, and adopts the force application method of the shoulder beam + hand chain hoist to quickly simulate the compression process. The entire test scheme is simple, highly operable, and simulates reality.

Description

Technical Field

[0001] The present invention relates to the field of self-balancing devices suitable for main cable strand extrusion deformation tests, and more specifically to a self-balancing device and a test method suitable for main cable strand extrusion deformation tests. Background Art

[0002] The main cables of suspension bridges are typically arranged in a hexagonal pattern in the suspension area, and are not tightened into a circular shape until the cable-wrapped sections are completed. In the main and loose cable saddles, the cables are typically shaped into quadrilaterals, and then placed in a specific order with partitions. Due to the lateral support provided by the partitions, the compression deformation of the lower cables during the installation of the upper cables is generally not a concern. However, in some temporary cable saddles, partitions are generally not installed to facilitate their later removal. Therefore, whether the hexagonal cables can maintain their shape after being subjected to pressure is a concern. However, there is currently a lack of a device and method for testing compression deformation. Therefore, a self-balancing device and method suitable for main cable strand compression deformation testing is urgently needed to address this issue. Summary of the Invention

[0003] To achieve these objects and other advantages according to the present invention, a preferred embodiment of the present invention provides a self-balancing device suitable for a main cable strand extrusion deformation test, comprising a support frame, a longitudinal beam, a support frame, a tensioning system, a hand chain hoist, a reaction frame, and a pressure plate;

[0004] The two supporting bodies are respectively arranged vertically and spaced apart from each other; the two supporting bodies are connected by a longitudinal beam;

[0005] A tensioning system is provided inside each of the supporting bodies, and cables are connected between the two tensioning systems;

[0006] The bottom of the reaction frame is in close contact with the top of the cable strand. The reaction frame can be pulled downward against the cable strand by a hand chain hoist. A support frame is installed below the bending point of the cable strand.

[0007] According to a preferred embodiment of the present invention, the supporting body includes end cross beams and upright columns, the two end cross beams are arranged in parallel, and the upright columns are vertically connected between the two end cross beams.

[0008] According to a preferred embodiment of the present invention, it further comprises a diagonal brace, which is arranged obliquely, with one end thereof connected to the column and the other end connected to the parallel joint, and the parallel joint is also arranged between the plurality of longitudinal beams.

[0009] According to a preferred embodiment of the present invention, the tensioning system includes a cable strand anchor head, an ear plate, a steel strand and a pressure plate. The two supporting bodies are respectively provided with an ear plate, and the cable strand anchor head is provided on the ear plate. Each cable strand anchor head is connected to one end of the cable strand. The pressure plate is tightly attached to the end crossbeam. One end of the steel strand is connected to the through-hole jack, and the other end passes through the reserved holes of the pressure plate in sequence and is connected to the ear plate.

[0010] According to a preferred embodiment of the present invention, the support frame is an elongated structure with elongated grooves on its surface for placing cable strands. The height of the support frame is determined according to the position angle of the main cable on the saddle.

[0011] According to a preferred embodiment of the present invention, a reaction groove is connected to the bottom of the support body.

[0012] On the other hand, a preferred embodiment of the present invention further provides a test method for a self-balancing device suitable for a main cable strand compression deformation test, comprising the following steps:

[0013] S1. After all the columns are hoisted into place, connect the bottom plate of the columns to the reaction trough with bolts; make the supporting body, and weld the longitudinal beam, parallel joint and diagonal brace between the two supporting bodies;

[0014] S2. The steel strands are passed through the reserved holes of the pressure plate in sequence, so that the pressure plate is close to the end beam, and the tensioning system is installed;

[0015] S3. Then, place the cable strand on the upper part of the support frame, and connect the cable strand anchor head to the ear plate of the tensioning system through a pin;

[0016] S4. Install the steel strands to design the internal forces of the cables. The height of the support frame simulates the angle of the main cable at the saddle position. At this time, the huge cable back tension is converted into the internal force of the self-balancing device.

[0017] S5. Install the reaction frame so that its bottom is close to the top of the cable strand. Use a hand hoist to pull the cable strand to apply reaction force and observe the deformation of the cable strand.

[0018] According to a preferred embodiment of the present invention, the cross section of the cable strand is a regular hexagon, and the shape of the groove of the support frame is adapted to the shape of the lower half of the cable strand.

[0019] The present invention includes at least the following beneficial effects: the self-balancing device of the present invention is suitable for the extrusion deformation test of the main cable strand with large tension and a certain angle, the construction process is simple, the construction difficulty is low, no additional processing is required for foundation reinforcement, and the requirements for the site foundation are extremely low. The tensioning and anchoring system is reasonably set up and easy to operate. The support frame and the card slot can be used to more accurately fix the angle and boundary conditions of the cable strand. The force application method of the shoulder beam + hand hoist is used to quickly simulate the compression process. The entire test plan is simple, highly operable, and the simulation is real.

[0020] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic structural diagram of the self-balancing device suitable for the main cable strand extrusion deformation test in the present invention.

[0022] Figure 2 It is a structural schematic diagram of the supporting body in the present invention.

[0023] Figure 3 It is a structural schematic diagram of the tensioning system in the present invention.

[0024] Figure 4 Schematic diagram of the structure of the support frame in the present invention. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] like Figure 1-4 As shown, a preferred embodiment of the present invention provides a self-balancing device suitable for a main cable strand extrusion deformation test, comprising a support frame, a longitudinal beam 3, a support frame 4, a tensioning system 7, a hand chain hoist 9, a reaction frame 10, and a pressure plate 16;

[0030] The two supporting bodies are respectively arranged vertically and spaced apart from each other; the two supporting bodies are connected by a longitudinal beam 3;

[0031] Each of the support bodies is provided with a tensioning system 7, and the two tensioning systems are connected with a cable strand 6;

[0032] The bottom of the reaction frame 10 is in close contact with the top of the cable strand 6. The reaction frame 10 can be pulled downward against the cable strand by the hand chain hoist 9. The support frame 4 is installed below the bending point of the cable strand.

[0033] In the above technical solution, a small amount of steel sections is used to construct two supporting bodies to form a frame structure. The two ends of the test cable strands are anchored to the two ends of the frame structure. By converting the anchoring force into the internal force of the structure itself and the shear force of the supporting bodies, the force is greatly reduced, and only the deadweight of the structure is required, which reduces the requirements for the test site foundation. At the same time, a tensioning system is installed at both ends of the frame structure, indirectly tensioning the test cable strands by tensioning the steel strands. Finally, a support frame 4 is lowered and installed below the cable strand bending point. A slot is provided on the top of the steel section to fit the cable strand. A shoulder beam is installed above the cable strand bending point. A hand winch is used to apply a compressive force to the cable strand to observe the deformation and dispersion of the cable strand under a fixed tension and angle.

[0034] Another technical solution provides a specific structure of the supporting body, which includes an end cross beam 1 and a column 5. The two end cross beams 1 are arranged in parallel, and the column 5 is vertically connected between the two end cross beams 1. It includes a diagonal brace 8, which is arranged at an angle, one end of which is connected to the column 5 and the other end is connected to the flat link 2. The flat link 2 is also arranged between multiple longitudinal beams 3.

[0035] Another technical solution provides a specific structure of the tensioning system 7, which includes a cable strand anchor head 13, an ear plate 14, a steel strand 15 and a pressure plate 16. The two supporting bodies are respectively provided with an ear plate 14, and the cable strand anchor head 13 is provided on the ear plate 14. Each cable strand anchor head 13 is connected to one end of the cable strand 6. The pressure plate 16 is tightly attached to the end crossbeam 1. One end of the steel strand 15 is connected to the through-hole jack, and the other end passes through the reserved holes of the pressure plate 16 in sequence and is connected to the ear plate 14.

[0036] Among them, the tensioning system mainly simulates the tensioning of the cable strands, and at the same time uses a hand hoist to apply cable strand extrusion force to observe the deformation and dispersion of the cable strands under fixed tension and angle.

[0037] In another technical solution, the support frame is an elongated structure with elongated grooves on its surface for placing the cable strands 6. The height of the support frame 4 is determined according to the position angle of the main cable on the saddle.

[0038] In another technical solution, a reaction groove is connected to the bottom of the support body, and the reaction groove is used to support the bottom of the support body, providing reverse support for the support body that is forced downward during the experiment to avoid direct impact on the ground.

[0039] The cross section of the cable strand is a regular hexagon, and the shape of the groove of the support frame 4 matches the shape of the lower half of the cable strand, so as to ensure that the cable strand can be securely fixed in the support frame 4 during the pressure test.

[0040] In another aspect, a test method of a self-balancing device for a main cable strand compression deformation test according to the present invention comprises the following steps:

[0041] S1. After all the columns 5 are hoisted into place, the bottom plate of the columns 5 is connected to the reaction groove by bolts; and the support body is made, and the longitudinal beam 3, the flat joint 2, and the diagonal brace 8 are welded between the two support bodies;

[0042] S2. The steel strands 15 are passed through the reserved holes of the pressure plate 16 in sequence, so that the pressure plate 16 is close to the end beam 1, and the installation of the tensioning system 7 is completed;

[0043] S3. Then, place the cable strand 6 on the upper portion of the support frame 4 and connect the cable strand anchor head 13 to the ear plate of the tensioning system 7 via a pin;

[0044] S4. Install the steel strand 15 to the cable strand design internal force. The height of the support frame 4 simulates the angle of the main cable at the saddle position. At this time, the huge cable strand back tension is converted into the internal force of the self-balancing device.

[0045] S5. Install the reaction frame 10 so that its bottom is in close contact with the top of the cable strand 6. Use the hand hoist 9 to pull the cable strand to apply a reaction force to the cable strand and observe the deformation of the cable strand.

[0046] The method of the present invention has a simple construction process and low construction difficulty. No additional processing is required for foundation reinforcement, and the requirements for the site foundation are extremely low. The tensioning anchoring system is reasonably set up and easy to operate. The main cable support frame + hexagonal slot can be used to more accurately fix the angle and boundary conditions of the cable strands. The force application method of the shoulder beam + hand hoist is used to quickly simulate the compression process. The entire test plan is simple, highly operable, and simulates reality.

[0047] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A self-balancing device for main cable strand extrusion deformation test, characterized in that: It includes supporting body, longitudinal beam, supporting frame, tensioning system, hand chain hoist, reaction frame and pressure plate; The two supporting bodies are respectively arranged vertically and spaced apart from each other; the two supporting bodies are connected by a longitudinal beam; A tensioning system is provided inside each of the supporting bodies, and cables are connected between the two tensioning systems; The bottom of the reaction frame is in close contact with the top of the cable strand. The reaction frame can be pulled downward against the cable strand by the hand chain hoist. A support frame is installed below the bending point of the cable strand. The support frame is a long strip structure with a long strip groove on its surface for placing the cable strands. The height of the support frame is determined according to the position angle of the main cable on the saddle. The cross section of the cable strand is a regular hexagon, and the shape of the groove of the support frame is adapted to the shape of the lower half of the cable strand.

2. The self-balancing device for main cable strand extrusion deformation test according to claim 1, characterized in that: The supporting body includes an end cross beam and two upright columns. The two upright columns are arranged in parallel, and the end cross beam is vertically connected between the two upright columns.

3. The self-balancing device for main cable strand extrusion deformation test according to claim 2, characterized in that: The self-balancing device further comprises an oblique brace, which is arranged obliquely, with one end of the oblique brace connected to the column and the other end connected to a parallel joint, and the parallel joint is arranged between a plurality of longitudinal beams.

4. The self-balancing device for main cable strand extrusion deformation test according to claim 3, characterized in that: The tensioning system includes a cable strand anchor head, an ear plate, a steel strand and two pressure plates. The two supporting bodies are respectively provided with an ear plate, and the cable strand anchor head is provided on the ear plate. Each cable strand anchor head is connected to one end of the cable strand. The pressure plate is tightly attached to the end crossbeam. One end of the steel strand is connected to the through-hole jack, and the other end passes through the reserved holes of the two pressure plates in sequence and is connected to the ear plate.

5. The self-balancing device for main cable strand extrusion deformation test according to claim 1, characterized in that: A reaction groove is installed at the bottom of the support body.

6. The test method of the self-balancing device for main cable strand compression deformation test according to claim 4, characterized in that: The following steps are involved: S1. After all the columns are hoisted into place, connect the bottom plates of the columns to the reaction troughs with bolts; make the supporting bodies, and weld the longitudinal beams, parallel joints and diagonal braces between the two supporting bodies; S2. The steel strands are passed through the reserved holes of the two pressure plates in sequence, so that the pressure plates are close to the end beams, and the tensioning system is installed. S3. Then, place the cable strand on the upper part of the support frame, and connect the cable strand anchor head to the ear plate of the tensioning system through a pin; S4. Install the steel strands to design the internal forces of the cables. The height of the support frame simulates the angle of the main cable at the saddle position. At this time, the huge cable back tension is converted into the internal force of the self-balancing device. S5. Install the reaction frame so that its bottom is close to the top of the cable strand. Use a hand hoist to pull the cable strand to apply reaction force and observe the deformation of the cable strand.

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