Self-stabilizing box girder static load prepressing device

Abstract

A self-stabilizing box girder static load pre-pressing device is characterized by comprising a girder storage ridge, a bottom carrying cross beam, a lower wooden bearing beam, a back pressure beam, an upper wooden bearing beam, a back pressure cross beam, a back pull rod, a back pull rod nut, a back pull rod jack and a test beam. The beam storage ridge is located at the bottommost part of the device; the bottom carrying cross beam is used for ensuring the stability of the whole structure; a reverse pull rod penetrates through the bottom carrying cross beam; the lower wood bearing beam is located in the middle of the bottom carrying cross beam. The back pressure cross beams are symmetrically arranged above the upper wood bearing beams and used for balancing force distribution; the reverse pull rod jack is used for accurately controlling the force; the test beam serves as a test object and is installed in the center of the device. The device is simple in structure, high in stability, more accurate in force control and more convenient to operate, the prestress applied to the test beam can be accurately controlled, and the safety of the test process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated box beam casting, in particular to a self-stabilizing box beam static load preloading device. Background Art

[0002] The static prestressing device for box girders is a device used to prestress concrete box girders during bridge construction. The main function of this device is to simulate the load conditions in actual use by pre-applying pressure after the concrete is poured, so as to test the bearing capacity and stability of the box girder. Traditional prestressing devices are used in bridge construction to test and enhance the stability of concrete structures. These devices usually require additional support systems, such as scaffolding or steel structure fixings, to keep them stable during loading. This increases construction costs and time, and may affect site safety. The need for external support also limits the flexibility of the device and may cause additional impacts on the environment. Utility Model Content

[0003] The purpose of the utility model is to accurately control the size of the prestress applied to the test beam by adjusting the anti-pull rod and the anti-pull rod nut, so as to simulate different loading conditions and improve the test accuracy. The design of the anti-pressure beam and the anti-pressure crossbeam makes the force distribution more balanced, ensuring the balance of the structure during the pressure test; the upper wooden pad beam and the lower wooden pad beam work together with the anti-pressure beam to enhance the stability and pressure distribution of the device; the design of the bottom crossbeam ensures the stability of the overall structure and improves the safety of the test process.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a self-stabilizing box girder static load preloading device, characterized in that it includes a beam storage ridge, a bottom crossbeam, a lower wooden pad beam, a counter-pressure beam, an upper wooden pad beam, a counter-pressure crossbeam, a counter-tension rod, a counter-tension rod nut, a counter-tension rod jack, and a test beam; the beam storage ridge is located at the bottom of the device and serves as a basic support frame for supporting the upper structure of the device; the two bottom crossbeams are symmetrically arranged above the two ends of the beam storage ridge to ensure the stability of the overall structure; two uniform holes are opened at both ends of the bottom crossbeam for the counter-tension rod to pass through; the lower wooden pad beam is located in the middle part of the bottom crossbeam to protect the concrete surface from direct impact; the counter-pressure beam is placed above the lower wooden pad beam to be responsible for balancing the force distribution and maintaining the structural balance during the pressure test; the three upper wooden pad beams, two of which are placed above the counter-pressure beam to balance the lower wooden pad beam and the counter-pressure beam The two beams work together to enhance the stability and pressure distribution of the device, and the other is set between the test beam in the middle of the device and the anti-tension rod jack; the anti-pressure beam is symmetrically set above the upper wooden pad beam to balance the force distribution and maintain structural balance during pressure testing; four evenly distributed holes are opened at both ends of the anti-pressure beam for the anti-tension rod to pass through; the four anti-tension rods are made of threaded steel and pass through the holes of the anti-pressure beam. The upper and lower ends are fixed with anti-tension rod nuts; the anti-tension rod nuts pass through the upper and lower ends of the anti-tension rod to fix the anti-tension rod. By adjusting the anti-tension rod and the anti-tension rod nut, the prestress applied to the test beam is controlled to simulate different loading conditions; the anti-tension rod jack is set below the middle of the anti-pressure beam, and the lower part is connected to the upper wooden pad beam in the middle to accurately control the force; the test beam is installed in the center of the device as a test object to evaluate its performance and stability when subjected to a predetermined load.

[0005] As a self-stabilizing box girder static load preloading device of the utility model, it is characterized in that a gasket is provided between the contact surface between the counter-tension rod nut and the counter-pressure beam and the bottom beam, so as to disperse the pressure, protect the counter-tension rod nut and avoid damage caused by direct contact with the device.

[0006] As a self-stabilizing box beam static load preloading device of the utility model, it is characterized in that a shock absorbing device is arranged between the counter-tension rod jack and the counter-pressure beam to reduce the vibration influence during the test process.

[0007] The utility model provides a self-stabilizing box beam static load preloading device, which has the following beneficial effects:

[0008] The utility model simplifies material requirements and reduces the use of additional materials and costs by utilizing the existing box beams in the beam storage area as counter-pressure beams. Secondly, the ease of operation is improved because the design of the device takes user-friendliness into consideration, allowing staff to easily conduct static preloading load tests. In addition, saving materials and labor is another important advantage, which not only reduces the overall cost of the project but also improves work efficiency. Finally, through the combined action of the bottom beam, counter-pressure beam, counter-pressure tie rod and counter-pressure jack, the stability and reliability of the preloading process are ensured, thereby ensuring the quality and safety of the box beam. While ensuring the quality of the project, both economic benefits and construction efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the utility model;

[0010] In the figure: 1. Storage beam; 2. Bottom beam; 3. Lower wooden pad beam; 4. Counter-pressure beam; 5. Upper wooden pad beam; 6. Counter-pressure beam; 7. Counter-tie rod; 8. Counter-tie rod nut; 9. Counter-tie rod jack; 10. Test beam. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the practical embodiment to clearly and completely describe the technical solution in the practical embodiment. Obviously, the described embodiment is only a part of the embodiment of the practical embodiment, not all of the embodiments. Based on the embodiment in the practical embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical embodiment.

[0012] See also Figure 1 The utility model provides a technical solution: a self-stabilizing box beam static load preloading device:

[0013] In this implementation scheme: First, high-strength steel is selected, cut and welded according to the designed size and shape to form a storage beam ridge. The storage beam ridge, as the basic support frame of the device, needs to have sufficient strength and stability; high-strength steel is also selected, cut and welded according to the designed size and shape to form a bottom beam. The bottom beam is used to connect the storage beam ridge to form a stable bottom frame; high-quality wood is selected, cut and processed according to the designed size to form the lower wooden pad beam. The lower wooden pad beam is used to support the counter-pressure beam and play a buffering and stabilizing role; high-strength steel is selected, cut and welded according to the designed size and shape to form a counter-pressure beam. The counter-pressure beam is used to transmit pressure and evenly distribute the pressure of the test beam to the lower wooden pad beam; high-quality wood is selected, cut and processed according to the designed size to form the upper wooden pad beam. The upper wooden pad beam is used to support the test beam, which plays a role of buffering and stabilization; high-strength steel is selected, cut and welded according to the designed size and shape to form a counter-pressure beam, which is used to connect the counter-pressure beam to form a stable top frame; precise holes are made on the bottom beam and the counter-pressure beam for the correct installation of the anti-tension rod; high-strength threaded steel is selected, cut and processed according to the designed size to form an anti-tension rod, which is used to connect the counter-pressure beam and the anti-tension rod nut to play a role in adjusting the pressure; high-strength steel is selected, cut and processed according to the designed size to form an anti-tension rod nut, which is used to connect the anti-tension rod and the anti-tension rod jack to play a role in adjusting the pressure; anti-tension rod jacks with appropriate weight ranges are selected to achieve pressure control on the test beam; the manufactured components are assembled according to the design requirements to form a complete self-stabilizing box beam static load preloading device. During the assembly process, it is necessary to pay attention to the firm connection of each component to ensure the stability and safety of the device; the test beam is placed on the device, and the test beam is subjected to appropriate pressure by adjusting the anti-tension rod jack. Observe the deformation of the test beam, record the data, and analyze the test results. Ensure that the ground where the device is placed is flat and solid, and harden the ground if necessary. Place the self-stabilizing box beam static load preloading device at the predetermined position; place the test beam at the center of the device and make appropriate adjustments to ensure its correct position; install necessary measurement and monitoring equipment, such as displacement sensors and strain gauges, to monitor the response of the test beam during the test; according to the experimental requirements, use the anti-pull rod jack to gradually apply prestress to the test beam to simulate different loading conditions; record the performance data of the test beam under different loading conditions and analyze it to evaluate its stability and load-bearing capacity; throughout the experiment, continuously monitor the stability and safety of the device to ensure the safety of the experimenters.

[0014] Specifically, a gasket is provided between the contact surface between the anti-pull rod nut and the anti-pressure beam and the bottom beam, so as to disperse the pressure, protect the anti-pull rod nut and avoid damage caused by direct contact with the device.

[0015] In this embodiment: Select a suitable gasket material, which is required to have sufficient strength and pressure resistance to withstand the pressure generated by the preloading device during operation. Common gasket materials include rubber, graphite, asbestos, asbestos-free and silicone; determine the specifications of the gasket according to the size of the contact surface, ensure that the gasket is in the correct position, the four sides are neat, and there is no skew or folding, so as to ensure uniform pressure transmission. After the gasket is placed, pass the anti-pull rod nut through the upper and lower ends of the anti-pull rod, and tighten it with a tool (such as a wrench) until the required preload force is reached. Check the tightness of the anti-pull rod nut to ensure that it will not loosen during the pressure application process to ensure the preloading effect and the safety of the device.

[0016] Specifically, a shock absorbing device is provided between the counter-pull rod jack and the counter-pressure beam to reduce the impact of vibration during the test.

[0017] In this embodiment: the shock absorbing device is installed between the anti-pull rod jack and the anti-pressure beam. During installation, it is necessary to ensure that the contact surface of the shock absorbing device, the jack and the beam is completely in contact, and each connection part is tightened to avoid new vibration sources due to loose installation, and to perform testing and debugging. Through the actual loading and unloading process, observe the performance of the shock absorbing device and make adjustments if necessary. For example, adjust the thickness of the shock absorbing material or replace the shock absorbing material with different hardness to achieve the best shock absorption effect.

[0018] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-stabilizing box girder static load preloading device, characterized in that: The device comprises a beam ridge (1), a bottom cross beam (2), a lower wooden cushion beam (3), a counter-pressure beam (4), an upper wooden cushion beam (5), a counter-pressure cross beam (6), a counter-pull rod (7), a counter-pull rod nut (8), a counter-pull rod jack (9), and a test beam (10); the beam ridge (1) is located at the bottom of the device and serves as a basic support frame for supporting the upper structure of the device; two bottom cross beams (2) are symmetrically arranged above the two ends of the beam ridge (1) to ensure the stability of the overall structure; the two ends of the bottom cross beam (2) are Two evenly spaced holes are provided for the anti-tension rod (7) to pass through; the lower wooden pad beam (3) is located in the middle of the bottom cross beam (2) to protect the concrete surface from direct impact; the anti-pressure beam (4) is placed above the lower wooden pad beam (3) to be responsible for balancing the force distribution and maintaining the structural balance during the pressure test; the upper wooden pad beams (5) are three, two of which are placed above the anti-pressure beam (4) to work in conjunction with the lower wooden pad beam (3) and the anti-pressure beam (4) to enhance the stability and pressure distribution of the device , and the other is arranged between the middle test beam (10) of the device and the anti-pull rod jack (9); the anti-pressure beam (6) is symmetrically arranged above the upper wooden pad beam (5) to balance the force distribution and maintain the structural balance during the pressure test; the two ends of the anti-pressure beam (6) are correspondingly provided with four evenly distributed holes for the anti-pull rod (7) to pass through; the four anti-pull rods (7) are made of threaded steel and pass through the holes of the anti-pressure beam (6), and the upper and lower ends are fixed with anti-pull rod nuts (8); the anti-pull rod nuts (8 ) passes through the upper and lower ends of the anti-tension rod (7) and is used to fix the anti-tension rod (7). By adjusting the anti-tension rod (7) and the anti-tension rod nut (8), the prestress applied to the test beam (10) is controlled to simulate different loading conditions; the anti-tension rod jack (9) is arranged below the middle of the anti-pressure beam (6) and is connected to the upper wooden pad beam (5) in the middle to accurately control the force; the test beam (10) is installed in the center of the device as a test object to evaluate its performance and stability when subjected to a predetermined load.

2. A self-stabilizing box beam static load preloading device according to claim 1, characterized in that: A gasket is provided between the contact surface between the anti-pull rod nut (8) and the anti-pressure beam (6) and the bottom beam (2) to disperse the pressure, protect the anti-pull rod nut (8) and avoid direct contact with the device to cause damage.

3. The self-stabilizing box beam static load preloading device according to claim 1 is characterized in that: A shock absorbing device is provided between the anti-pull rod jack (9) and the anti-pressure beam (6) to reduce the impact of vibration during the test process.

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