A method for pre-pressing a side-span cast-in-place box girder support

Abstract

The application provides a kind of side-span cast-in-place box girder support pre-pressing method, belongs to bridge engineering construction technical field.Limiting component includes the installation nail inserted in installation slot, the top outer wall of installation nail is equipped with sliding cavity, the outer wall of installation nail near bottom end is equipped with clamping groove, the inner wall of sliding cavity is slidably connected with pressing handle, the bottom inner wall of sliding cavity is equipped with first sliding slot, the bottom outer wall of pressing handle is fixedly connected with pressing column, the outer wall of pressing column near top is sleeved with second spring, the outer wall of pressing column near middle is fixedly connected with a plurality of connection columns distributed in circumferential array.The limiting component is set, not only can block the displacement of water bag during water injection, avoid the deformation of support caused by the heavy weight of water bag after water filling, and the falling of water bag, and the workers or equipment under the falling of water bag, but also can quickly install the limiting component, and the installation structure is simple, which is beneficial to improve the work efficiency of workers.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a method for prestressing a cast-in-place box girder support for a side span. Background Technology

[0002] Preloading of the support structure for cast-in-place box girders in side spans refers to a loading test conducted on the support structure that supports the formwork and concrete pouring of the box girder during the construction of the side span cast-in-place box girder, simulating the actual construction load. Its core purpose is to verify the reliability of the support structure through preloading, eliminate inelastic deformation, and obtain elastic deformation data to provide parameter basis for subsequent box girder pouring construction, ensuring the safety and alignment accuracy of the box girder structure.

[0003] Currently, common preloading materials for cast-in-place box girder supports in side spans include sandbags, precast concrete blocks, and water bags. Compared with sandbags and precast concrete blocks, water bags have advantages such as convenient loading / unloading, controllable water injection speed via valves, and high degree of mechanization. However, in actual use, water bags are quite heavy after being filled with water (a single water bag can weigh several tons). If the support deforms, the water bag breaks, or is not securely fixed and slips, it may injure personnel or equipment below. Therefore, it is necessary to set up a fence to prevent the water bag from shifting. However, the traditional preloading water bag fence installation method is cumbersome and affects the work efficiency of workers. Therefore, this invention provides a preloading method for cast-in-place box girder supports in side spans to meet the requirements. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a pre-stressing method for a side-span cast-in-place box girder support. By setting a limiting component, it not only prevents the water bag from shifting during water injection, avoiding the support from deforming and slipping due to the large weight of the water bag after filling, thus preventing injury to personnel or equipment below, but also allows for quick installation of the limiting component. The installation structure is simple, which helps improve the work efficiency of workers. In addition, it can be adjusted according to the width of the support plate and the pre-stressing position, so that the water bag is in the target position for pre-stressing after filling with water, avoiding affecting the accuracy of the settlement measurement at each observation point. Through the above settings, the problems of water bag shifting during water injection and low worker efficiency can be solved.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A method for preloading a cast-in-place box girder support in a side span includes the following steps: Step 1: Preparation: Check the support structure and foundation bearing capacity, set up observation points on the top of the support and the foundation surface and measure the initial elevation; Step 2, Pre-compression material installation: First, check the support structure and foundation bearing capacity. Then, mark the water bag placement area on the top plate of the support, plan the drainage path, install the fence and lay the water bags, and finally connect the water injection pipe. Step 3, graded loading and observation: The water injection rate is controlled by valves, and water is injected in stages at 50%, 100%, and 110% load. During this period, the settlement at each observation point is measured regularly. Step 4, Unloading and Data Recording: Unload in reverse order of loading. After unloading 50% of the load, measure the rebound value of the support, record the settlement and rebound data at each stage, and calculate the inelastic deformation and elastic deformation. Step 5, Acceptance and Conclusion: Compile the prestressing data to form a report, analyze the bearing capacity of the support, the elimination of inelastic deformation and elastic deformation parameters. After acceptance, proceed with the box girder pouring construction.

[0006] Optionally, the fence includes a movable base mounted on the surface of the support plate. The overall outline of the movable base is "X" shaped. Several mounting slots arranged in a linear array are symmetrically formed on the top outer walls of both ends of the movable base. Several first clearance slots arranged in a circular array are formed on the inner wall of the mounting slots near the top of the movable base. An inclined plate is fixedly connected to the inner wall of the first clearance slot near the bottom of the movable base. An S-shaped elastic plate is fixedly connected to the end of the inclined plate away from the first clearance slot. A first spring is fixedly connected to the bottom inner wall of the mounting slot. A catapult plate is fixedly connected to the end of the first spring away from the bottom inner wall of the mounting slot. A clearance hole is formed on the top outer wall of the catapult plate. A limiting component is also included, which is used to prevent the water bag from shifting during water injection. The limiting component is connected to the movable base.

[0007] Optionally, the limiting component includes a mounting pin inserted into the mounting slot, a sliding cavity formed on the top outer wall of the mounting pin, a snap-fit ​​groove formed on the outer wall of the mounting pin near the bottom end, a pressing handle slidably connected to the inner wall of the sliding cavity, a first sliding groove formed on the bottom inner wall of the sliding cavity, a pressing post fixedly connected to the bottom outer wall of the pressing handle, a second spring sleeved on the outer wall of the pressing post near the top, and a plurality of connecting posts arranged in a circumferential array fixedly connected to the outer wall of the pressing post near the middle.

[0008] Optionally, an abutment cylinder is fixedly connected to the end of the connecting post away from the pressing post, a second clearance groove is provided on the outer wall of the mounting nail near the middle, and a guardrail is installed on the outer wall of the mounting nail near the middle, the overall outline of the guardrail being a hollow right-angled triangular prism shape.

[0009] Optionally, the top and bottom outer walls of the railing are symmetrically provided with first rotating grooves, and the two outer walls of the railing near the right angle edge are respectively provided with second sliding grooves. The inner wall of the second sliding groove near the middle is provided with a plurality of limiting grooves distributed in a linear array.

[0010] Optionally, mounting platforms are symmetrically rotatably connected to both ends of the railing. A second rotating groove is provided on the outer wall of the end of the mounting platform away from the railing. Two limiting plates are fixedly connected to the outer wall of the end of the mounting platform away from the railing. A barrier strip is installed on the inner wall of the limiting groove.

[0011] Optionally, a U-shaped clamping plate is installed on the inner wall of the second sliding groove near the bottom. A sliding cylinder is fixedly connected to the outer wall of the U-shaped clamping plate away from the second sliding groove. A first threaded hole is opened on the outer wall of the sliding cylinder away from the U-shaped clamping plate. A sliding plate is slidably connected to the inner wall of the sliding cylinder. A blocking plate is fixedly connected to the end of the sliding plate away from the sliding cylinder.

[0012] Optionally, a third rotating groove is provided on the outer wall of the barrier plate near the top, a third sliding groove is provided on the outer wall of the barrier plate near the bottom, the inner wall of the third sliding groove near the bottom is provided with rounded corners, and a support column is fixedly connected to the outer wall of the barrier plate near the third rotating groove.

[0013] Optionally, a fourth sliding groove is provided on the outer wall of the support column near the top, and a fourth rotating groove is provided on the outer wall of the end of the support column away from the barrier plate. A sliding column is slidably connected to the inner wall of the fourth sliding groove, a sliding circular plate is fixedly connected to one end of the sliding column, and a screw cylinder is fixedly connected to the other end of the sliding column.

[0014] Optionally, a pull rod is fixedly connected to the outer wall of the screw-in cylinder near the bottom. A second threaded hole is opened on the outer wall of one end of the screw-in cylinder. A threaded rod is screwed onto the inner wall of the second threaded hole. A rotating rudder is fixedly connected to one end of the threaded rod, and a rotating protrusion is fixedly connected to the other end of the threaded rod.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting a limiting component, not only can the water bag be prevented from shifting during the water injection process, avoiding the deformation of the support due to the large weight of the water bag after it is filled with water, which could cause it to slip and injure personnel or equipment below, but the limiting component can also be installed quickly and the installation structure is simple, which is conducive to improving the work efficiency of workers. In addition, it can be adjusted according to the width of the support plate and the pre-compression position, so that the water bag is in the target position that needs to be pre-compressed after it is filled with water, thus avoiding affecting the accuracy of the settlement of each observation point.

[0016] By incorporating mounting nails, side panels, mounting platforms, tilting plates, and S-shaped flexible plates, the system can accommodate trays of different widths or lengths. It also allows workers to quickly install the side panels onto the movable base, saving installation time. Furthermore, the disassembly process is simple for workers, greatly improving their work efficiency.

[0017] By setting up a barrier band, a second sliding groove, and a limiting groove, it is easy to install the barrier band onto the second sliding groove, while also providing a certain limiting effect for the barrier band to prevent it from shifting due to compression during subsequent water bag filling, thus affecting the limiting of the water bag.

[0018] By incorporating a sliding cylinder, a U-shaped clamping plate, a rotating handle, and a sliding plate, the position of the sliding cylinder on the outer wall of the sliding plate can be adjusted according to the distance between the two railings. This facilitates the installation of the U-shaped clamping plate onto the railings, while also providing some stability to the railings and limiting the movement of the movable base. By incorporating threaded rods, rotating handles, rotating protrusions, threaded cylinders, sliding columns, and pulling columns, not only can barrier plates be quickly installed onto the guardrails, but the distance between two guardrails can also be adjusted to accommodate support plates of different widths or lengths. Furthermore, the barrier band can be tightened to prevent the water bag from shifting during the water filling process. Attached Figure Description

[0019] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0020] Figure 1 A three-dimensional structural schematic diagram of the pre-stressing method for the cast-in-place box girder support in the side span; Figure 2 Enlarged 3D structural diagram of the movable base, railings, and barrier strips; Figure 3 for Figure 2 Enlarged 3D structural diagram at point A; Figure 4 Enlarged 3D structural diagram of the movable base and mounting slot; Figure 5 A semi-section enlarged three-dimensional structural diagram showing the fit between the movable base and the mounting slot; Figure 6 Enlarged 3D structural diagram for mounting platform and railing; Figure 7 This is an enlarged 3D structural diagram of the mounting platform; Figure 8 This is an enlarged three-dimensional structural diagram of the balustrade. Figure 9 A semi-enlarged three-dimensional structural diagram showing the fitting of the mounting nail, pressing handle, pressing post, and abutment cylinder; Figure 10 Enlarged 3D structural diagram of the mounting nail and the connecting tube; Figure 11 An enlarged 3D structural diagram of the mounting nail; Figure 12An enlarged three-dimensional structural diagram of the pressing handle, pressing post, and abutment cylinder in conjunction; Figure 13 Enlarged 3D structural diagram of the U-shaped card plate, sliding cylinder, sliding plate and barrier plate in combination; Figure 14 A magnified three-dimensional structural diagram of the U-shaped card plate and the sliding cylinder in combination; Figure 15 A schematic diagram of the three-dimensional structure of the sliding plate, barrier plate and support column; Figure 16 An enlarged three-dimensional structural diagram of the rotating rudder, threaded rod, threaded cylinder, and pulling rod.

[0021] Figure label: 1. Bracket; 101. Support plate; 102. Water bag; 2. Movable base; 201. Mounting groove; 202. First clearance groove; 203. Inclined plate; 204. S-shaped elastic plate; 205. First spring; 206. Ejection plate; 207. Clearance hole; 3. Guardrail; 301. Second sliding groove; 302. Limiting groove; 303. First rotating groove; 4. Mounting pin; 401. Snap-fit ​​groove; 402. Sliding cavity; 403. Second clearance groove; 404. Press handle; 405. Pressing post; 406. Second spring; 407. Connecting post; 408. Abutment cylinder; 409. 5. First sliding groove; 6. Mounting platform; 7. Second rotating groove; 8. Limiting plate; 9. Barrier strip; 10. U-shaped clamping plate; 11. Sliding cylinder; 12. First threaded hole; 13. Rotating handle; 14. Barrier plate; 15. Sliding plate; 16. Third rotating groove; 17. Third sliding groove; 18. Support column; 19. Fourth sliding groove; 10. Fourth rotating groove; 10. Threaded cylinder; 11. Second threaded hole; 12. Sliding column; 13. Sliding circular plate; 14. Pulling rod; 15. Threaded rod; 16. Rotating protrusion; 17. Rotating rudder.

[0022] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0023] The prestressing method for a side-span cast-in-place box girder support provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0024] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0025] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0026] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0027] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0028] like Figures 1 to 16 As shown, an embodiment of the present invention provides a preloading method for a side-span cast-in-place box girder support 1, comprising the following steps: Step 1: Preparation: Check the structure and foundation bearing capacity of support 1, set up observation points on the top of support 1 and the foundation surface and measure the initial elevation. At the same time, prepare water bags 102 and installation tools. The preload is generally 1.1 times the total weight of the box girder. Step 2, Pre-compression material installation: First, check the structure and foundation bearing capacity of bracket 1 to ensure it is stable and free of hidden dangers. Then, mark the placement area of ​​water bags 102 on the surface of the top support plate 101 of bracket 1, plan the drainage path, and prepare water filling equipment (water pump, water pipe), sealant, repair materials and safety protection equipment. First, install the fence, and then lay the water bags 102. When laying, you need to clean the debris on the surface of the top support plate 101 of bracket 1, and then lay a waterproof canvas or pad to protect the water bags 102. Then, lay the water bags 102 flat in the designated area, taking care to avoid folding or scratching. Finally, connect the water injection pipe. Step 3, graded loading and observation: Control the water injection speed through valves; inject water in stages of 50%, 100%, and 110% load, and let it stand for more than 24 hours after each stage of water injection. During this period, measure the settlement at each observation point regularly until the settlement difference is ≤2mm for 24 consecutive hours, which is considered as settlement stability. Step 4, Unloading and Data Recording: Unload in reverse order of loading. After unloading 50% of the load, measure the rebound value of the support. Record the settlement and rebound data at each stage and calculate the inelastic deformation and elastic deformation. Step 5. Acceptance and Conclusion: Organize the preloading data to form a report, analyze the bearing capacity of the support 1, the elimination of inelastic deformation, and the elastic deformation parameters. If the design requirements are met and it is qualified after acceptance by multiple parties such as the supervisor, the subsequent box girder pouring construction can be carried out. The fence includes a movable base 2 installed on the surface of the support plate 101. The overall contour of the support plate 101 is in a "Ji" shape, which is publicly known in the prior art and will not be elaborated here. The overall contour of the movable base 2 is in an "X" shape and is made of metal. It is formed by connecting two square metal columns with arcs at both ends through a pivot. This connection method has a simple structure, low production cost, and can adjust the opening and closing angle of the movable base 2 to adapt to the widths of different support plates 101, which is publicly known in the prior art and will not be elaborated here. A number of mounting grooves 201 are symmetrically arranged on the top outer walls at both ends of the movable base 2 in a linear array. The mounting grooves 201 are circular grooves. A number of first avoidance grooves 202 are arranged on the inner wall of the mounting groove 201 near the top of the movable base 2 in a circumferential array. The first avoidance grooves 202 are square grooves. There are three first avoidance grooves 202 in total. An inclined plate 203 is fixedly connected to the inner wall of the first avoidance groove 202 near the bottom of the movable base 2. The inclined plate 203 is a square metal plate. One end of the inclined plate 203 away from the first avoidance groove 202 is fixedly connected to an S-shaped elastic plate 204. The S-shaped elastic plate 204 is an "S"-shaped metal plate. One end of the S-shaped elastic plate 204 away from the inclined plate 203 is fixedly connected to the inner wall of the first avoidance groove 202 near the bottom. When the inclined plate 203 is subjected to an extrusion force, one end of the inclined plate 203 close to the S-shaped elastic plate 204 will undergo an inclined displacement, and at the same time, the S-shaped elastic plate 204 is stressed and deformed along its bending direction. A first spring 205 is fixedly connected to the bottom inner wall of the mounting groove 201. The first spring 205 is publicly known in the prior art and will not be elaborated here. When the first spring 205 is stressed, it will deform along its bending direction. One end of the first spring 205 away from the bottom inner wall of the mounting groove 201 is fixedly connected to an ejection plate 206. The ejection plate 206 is composed of a metal circular plate and three sector-shaped metal plates. The overall contour is adapted to the contour of the mounting groove 201 and can slide on the inner wall of the mounting groove 201. The three sector-shaped metal plates are located on the outer wall of the metal circular plate in a circumferential array, and the contour formed between every two sector-shaped metal plates is adapted to the outer wall contour of the inclined plate 203. Therefore, during the process of the first spring 205 no longer being stressed and restoring deformation along the bending direction, it will push the ejection plate 206 to slide along the inner wall of the mounting groove 201 towards the top outer wall of the movable base 2. During this period, the ejection plate 206 will not be blocked by the inclined plate 203. An avoidance hole 207 is arranged on the top outer wall of the ejection plate 206. The avoidance hole 207 is a circular groove and penetrates from the bottom outer wall of the ejection plate 206; a limiting component, which is used to prevent the water bag 102 from shifting during the water injection process, and the limiting component is connected to the movable base 2.

[0029] This application, by setting a limiting component, can not only prevent the water bag 102 from shifting during the water filling process, thus avoiding the deformation of the support 1 and its slippage due to the large weight of the water bag 102 after being filled with water, which could injure personnel or equipment below, but also allows for quick installation of the limiting component. The installation structure is simple and helps improve the work efficiency of workers. In addition, it can be adjusted according to the width of the support plate 101 and the pre-compression position, so that the water bag 102 is in the target position that needs to be pre-compressed after being filled with water, thus avoiding affecting the accuracy of the settlement at each observation point.

[0030] As one implementation method in this embodiment, such as Figures 1 to 12As shown, the limiting component includes a mounting pin 4 inserted into the mounting groove 201. The mounting pin 4 consists of three metal cylinders, wherein the diameter of the metal cylinder near the top of the mounting pin 4 is larger than that of the middle metal cylinder and larger than that of the bottom metal cylinder. The outer wall contour near the bottom of the mounting pin 4 matches the inner wall contour of the mounting groove 201, thus allowing the mounting pin 4 to be inserted into the mounting groove 201. A second clearance groove 403 is formed on the outer wall near the middle of the mounting pin 4. A sliding cavity 402 is formed on the top outer wall of the mounting pin 4. The sliding cavity 402 is a circular groove, and a chamfer is provided on the inner wall near the top of the mounting pin 4. The chamfer provides guidance when the worker inserts a tool into the sliding cavity 402. A second clearance groove 403 is formed on the outer wall near the bottom of the mounting pin 4. A snap-fit ​​groove 401 is provided, which is a square annular groove. The inner wall contour of the snap-fit ​​groove 401 is adapted to the contour formed by the engagement of the inclined plate 203 and the S-shaped elastic plate 204 mentioned above. Therefore, the inclined plate 203 and the S-shaped elastic plate 204 can be snapped onto the inner wall of the snap-fit ​​groove 401 to limit the mounting pin 4. A pressing handle 404 is slidably connected to the inner wall of the sliding cavity 402. The pressing handle 404 is a metal circular plate, and the outer wall contour of the pressing handle 404 is adapted to the inner wall contour of the sliding cavity 402. Therefore, the pressing handle 404 can slide on the inner wall of the sliding cavity 402. A first sliding groove 409 is provided on the bottom inner wall of the sliding cavity 402. The first sliding groove 409 is a circular groove, and the bottom outer wall of the pressing handle 404 is fixed. A pressing post 405 is connected, which is a metal cylinder. The outer contour of the pressing post 405 is adapted to the inner contour of the first sliding groove 409, so the pressing post 405 can slide on the inner wall of the first sliding groove 409. The outer contour of the pressing post 405 near the bottom is adapted to the inner contour of the clearance hole 207, so the pressing post 405 can pass through the clearance hole 207. A second spring 406 is sleeved on the outer wall of the pressing post 405 near the top. One end of the second spring 406 is fixedly connected to the bottom outer wall of the pressing handle 404, and the other end is fixedly connected to the bottom inner wall of the sliding cavity 402. When the second spring 406 is subjected to force, it will deform along its bending direction. The second spring 406 is a prior art disclosure, so it will not be described in detail. As described above, several connecting posts 407 arranged in a circular array are fixedly connected to the outer wall of the pressing post 405 near the center. The connecting posts 407 are metal cylinders, and the outer contour of the connecting posts 407 matches the inner contour of the second clearance groove 403. Therefore, the connecting posts 407 can slide on the inner wall of the second clearance groove 403. An abutment cylinder 408 is fixedly connected to the end of the connecting posts 407 away from the pressing post 405. The abutment cylinder 408 is a hollow metal cylinder, and a chamfer is provided on the outer wall of the abutment cylinder 408 near the bottom. This arrangement allows the bottom end of the abutment cylinder 408 to abut against the outer wall of the inclined plate 203, causing the inclined plate 203 to tilt and displace under force, thus releasing the restriction on the mounting nail 4. A guardrail 3 is installed on the outer wall of the mounting nail 4 near the center.The overall outline of the guardrail 3 is a hollow right-angled triangular prism, with the opposite sides of the right angle being open, which facilitates the limiting of the four corners of the water bag 102. The guardrail 3 is made of metal, and the top and bottom outer walls of the guardrail 3 are symmetrically provided with first rotating grooves 303, which are circular grooves. The two ends of the guardrail 3 are symmetrically rotatably connected to mounting platforms 5. The mounting platforms 5 are composed of metal circular plates at both ends and a metal cylinder in the middle, and the overall outline is "I" shaped. The diameter of the metal circular plate on the mounting platform 5 that is away from the middle of the guardrail 3 is larger than that of the metal circular plate that is close to the middle of the guardrail 3. The outer wall outline of the metal cylinder in the middle of the mounting platform 5 is adapted to the inner wall outline of the first rotating groove 303. Therefore, the mounting platform 5 can rotate on the inner wall of the first rotating groove 303. The outer wall of the end of the mounting platform 5 away from the middle of the guardrail 3 is... A second rotating groove 501 is provided on the mounting platform 5, extending through the other end of the mounting platform 5. The second rotating groove 501 is a circular groove, and its inner wall contour matches the outer wall contour near the center of the mounting nail 4. Therefore, the mounting platform 5 can rotate on the outer wall near the center of the mounting nail 4. Two limiting plates 502 are fixedly connected to the outer wall of the mounting platform 5 away from the guardrail 3. The limiting plates 502 are curved metal plates at the end away from the mounting platform 5. The two limiting plates 502 are symmetrical about the second rotating groove 501, and the distance between the two limiting plates 502 matches the width of the movable base 2. Under the guidance of the curved limiting plates 502 on both sides, the worker can quickly align the second rotating groove 501 on the mounting platform 5 with the mounting groove 201 on the movable base 2.

[0031] During installation, workers first use a crane to hoist the movable base 2 onto the top outer wall of the support plate 101 of the bracket 1. Then, in coordination with the crane, the opening angle of the movable base 2 is adjusted according to the width of the support plate 101. Finally, the guardrail 3 is installed onto the movable base 2. Under the guidance of the arc-shaped ends of the two limiting plates 502, the second rotating groove 501 on the mounting platform 5 can be quickly aligned with the mounting groove 201 on the movable base 2. Then, the guardrail 3 is fixed onto the movable base 2 using mounting nails 4. When the mounting nails 4 are inserted into the mounting groove 201, the outer wall of the inclined plate 203 will tilt due to the pressure of the bottom outer wall of the mounting nails 4. At this time, the S-shaped... The elastic plate 204 is subjected to force and deforms along its bending direction until the inclined plate 203 slides into the locking groove 401 of the mounting nail 4. At this time, the S-shaped elastic plate 204 is no longer subjected to force, recovers its deformation along the bending direction, and drives the inclined plate 203 to reset, thereby limiting the mounting nail 4. When the mounting nail 4 is inserted, the ejector plate 206 is subjected to the resistance force of the bottom outer wall of the mounting nail 4 and slides along the inner wall of the mounting groove 201 towards the bottom inner wall of the mounting groove 201. At this time, the first spring 205 is subjected to force and deforms along the bending direction. When disassembling the guardrail 3, the worker needs to use a tool to insert the mounting nail 4. The inner wall of the sliding cavity 402 is struck by a tool, causing it to contact the pressing handle 404 and move towards the bottom of the mounting pin 4. At this time, the second spring 406 is compressed along its elastic direction. The pressing column 405, driven by the pressing handle 404, slides along the inner wall of the first sliding groove 409 towards the bottom of the mounting pin 4, passing through the clearance hole 207 and contacting the bottom inner wall of the mounting groove 201. The connecting column 407, driven by the pressing column 405, slides along the second clearance groove 403 towards the bottom of the mounting pin 4. The abutting cylinder 408, driven by the connecting column 407, moves towards the bottom of the mounting pin 4, contacting the outer wall of the inclined plate 203 and causing it to be stressed. When tilted, the second spring 406 undergoes elastic deformation due to the pressure of the tilting plate 203, releasing the restriction on the mounting nail 4. Subsequently, the first spring 205 recovers its elastic deformation, pushing the ejector plate 206 to slide along the inner wall of the mounting groove 201 towards the top outer wall of the movable base 2, ejecting the mounting nail 4 from the mounting groove 201, thus removing the railing plate 3. The above structural design not only adapts to trays 101 of different widths or lengths, but also facilitates workers to quickly install the railing plate 3 onto the movable base 2, saving installation time. In addition, the operation is simple for workers during disassembly, greatly improving their work efficiency.

[0032] In this embodiment, as Figures 1 to 3 and Figures 6 to 8As shown, second sliding grooves 301 are respectively provided on the outer walls of the two sides near the right-angle edge of the panel 3. The second sliding grooves 301 are "L"-shaped grooves. The shorter sides of the two second sliding grooves 301 are connected to each other, forming a groove with an overall outline of "n". On the longer side of the second sliding groove 301, near the middle of its inner wall, there are several limiting grooves 302 arranged in a linear array. The limiting grooves 302 are triangular columnar grooves. There are three limiting grooves 302 in total. The inner wall of the limiting grooves 302 is equipped with three barrier strips 6. The barrier strips 6 are made of nylon and are disclosed in the prior art, so they will not be described in detail. The outer wall outline of the barrier strips 6 is adapted to the inner wall outline of the second sliding grooves 301. Therefore, the barrier band 6 can slide on the inner wall of the second sliding groove 301, and the outer contour of the barrier band 6 matches the inner contour of the limiting groove 302. Thus, when the barrier band 6 slides into the inner wall of the limiting groove 302, the limiting groove 302 can limit the barrier band 6. The three barrier bands 6 can slide into the connection of the two second sliding grooves 301 and slide along the inner wall of the second sliding groove 301 to the inner wall of the three limiting grooves 302 respectively. The above structure makes it easy to install the barrier band 6 onto the second sliding groove 301, and at the same time provides a certain limiting effect for the barrier band 6, so as to prevent the barrier band 6 from being squeezed and displaced when the water bag 102 is filled with water, which would affect the limiting of the water bag 102.

[0033] In this embodiment, as Figures 1 to 3 , Figure 6 , Figure 8 and Figures 13 to 16As shown, a U-shaped clamping plate 7 is installed on the inner wall of the second sliding groove 301 near the bottom. The U-shaped clamping plate 7 is a metal plate in the shape of a "U". A sliding cylinder 701 is fixedly connected to the outer wall of the end of the U-shaped clamping plate 7 away from the second sliding groove 301. The sliding cylinder 701 consists of two parts: a hollow metal cuboid and a metal cylinder. The metal cylinder is located on one outer wall of the hollow metal cuboid. A first threaded hole 702 is opened on the outer wall of the sliding cylinder 701 away from the U-shaped clamping plate 7. The sliding cylinder 701 has a circular groove with threads on its inner wall. A sliding plate 801 is slidably connected to the inner wall of the sliding cylinder 701. The sliding plate 801 is a metal plate with an arc at one end, and the outer contour of the sliding plate 801 matches the inner contour of the sliding cylinder 701. Therefore, the sliding plate 801 can slide on the inner wall of the sliding cylinder 701. A rotating handle 703 is screwed onto the inner wall of the first threaded hole 702. The rotating handle 703 consists of two parts: a metal cylinder with threads on its outer wall and a metal cylinder with anti-slip grooves on its outer wall. The rotating handle 703 has a threaded metal cylinder on its outer wall located at the end of the rotating handle 703 near the first threaded hole 702. The outer wall contour of the rotating handle 703 near the first threaded hole 702 matches the inner wall contour of the first threaded hole 702. Therefore, the rotating handle 703 can rotate on the inner wall of the first threaded hole 702. When the sliding cylinder 701 slides along the outer wall of the sliding plate 801 to an appropriate position, the rotating handle 703 can be rotated clockwise, and the rotating handle 703 will rotate along the first threaded hole 702. The inner wall of the threaded hole 702 rotates and moves towards the sliding plate 801. The end of the hole near the sliding plate 801 will abut against the outer wall of the sliding plate 801, fixing the sliding cylinder 701 to the outer wall of the sliding plate 801. This allows the position of the sliding cylinder 701 on the outer wall of the sliding plate 801 to be adjusted according to the distance between the two railings 3, making it easier to install the U-shaped clamping plate 7 onto the railing 3. At the same time, it provides a certain fixing effect for the railing 3 and a certain limiting effect for the movable base 2.

[0034] A baffle plate 8 is fixedly connected to the end of the sliding plate 801 away from the sliding cylinder 701. The baffle plate 8 is a square metal plate. A third rotating groove 802 is formed on the outer wall of the baffle plate 8 near the top. The third rotating groove 802 is a circular groove. A third sliding groove 803 is formed on the outer wall of the baffle plate 8 near the bottom. The third sliding groove 803 is a square groove, and the inner wall of the third sliding groove 803 near the bottom is rounded to facilitate the sliding of the three baffle strips 6 into the inner wall of the third sliding groove 803. A support column 804 is fixedly connected to the outer wall of the baffle plate 8 near the third rotating groove 802. The support column 804 is an "L"-shaped metal column. A fourth sliding groove 805 is formed on the outer wall of the support column 804 near the top. The fourth sliding groove 805 is formed by two ends. A square groove with an arc shape has a fourth rotating groove 806 on the outer wall of the end of the support column 804 away from the barrier plate 8. The fourth rotating groove 806 is a circular groove. A sliding column 902 is slidably connected to the inner wall of the fourth sliding groove 805. The sliding column 902 is a metal cylinder, and its outer contour matches the inner contour of the fourth sliding groove 805, so the sliding column 902 can slide on the inner wall of the fourth sliding groove 805. A sliding circular plate 903 is fixedly connected to one end of the sliding column 902. The sliding circular plate 903 is a metal circular plate, which can prevent the sliding column 902 from sliding out of the inner wall of the fourth sliding groove 805. A screw-connected cylinder 9 is fixedly connected to the other end of the sliding column 902. The screw-connected cylinder 9 is a metal cylinder, and its outer wall has a... A second threaded hole 901 is provided, which is a circular groove with threads on its inner wall. A pull rod 904 is fixedly connected to the outer wall of the screw-in cylinder 9 near the bottom. The pull rod 904 is a metal cylinder with an arc at one end, and a barrier band 6 is wrapped around its outer wall. A threaded rod 905 is screwed onto the inner wall of the second threaded hole 901. The threaded rod 905 is a metal cylinder with threads on its middle outer wall, and the outer wall contour of the threaded rod matches the inner wall contour of the second threaded hole 901. Therefore, the threaded rod 905 can rotate on the inner wall of the second threaded hole 901. A rotating rudder 907 is fixedly connected to one end of the threaded rod 905. The rotating rudder 907, made of metal, resembles a ship's rudder, which facilitates the worker to rotate the threaded rod 905. The technology is publicly available and will not be described in detail. A rotating protrusion 906 is fixedly connected to the other end of the threaded rod 905. The rotating protrusion 906 consists of three parts: metal circular plates at both ends and a metal cylinder in the middle. The outer contour of the metal cylinder in the middle of the rotating protrusion 906 matches the inner contour of the fourth rotating groove 806. Therefore, when the threaded rod 905 rotates, it will cause the rotating protrusion 906 to rotate along the inner wall of the fourth rotating groove 806. When the rotating rudder 907 is rotated clockwise, the rotating rudder 907 will cause the threaded rod 905 to rotate. At this time, the rotating protrusion 906 will follow the threaded rod 905 to rotate along the inner wall of the fourth rotating groove 806. The threaded sleeve 9, limited by the sliding column 902, will not rotate with the threaded rod 905.Instead, it will shift in the direction of the rotating rudder 907. At this time, the sliding column 902 will shift along the inner wall of the fourth sliding groove 805 away from the barrier plate 8 under the drive of the screw cylinder 9. At this time, the pulling rod 904 will shift with the screw cylinder 9 towards the barrier plate 8 and pull the barrier band 6 to tighten it. The above mechanism can not only quickly install the barrier plate 8 onto the guardrail 3, but also adjust the distance between the two guardrails 3 to accommodate the support plate 101 with different widths or lengths. In addition, it can tighten the barrier band 6 to prevent the water bag 102 from shifting during water filling.

[0035] The working principle of the technical solution provided by this invention is as follows: During installation, the worker first uses a crane to place the movable base 2 on the outer wall of the top of the support plate 101 of the bracket 1. Then, the worker, in coordination with the crane, adjusts the opening angle of the movable base 2 according to the width of the support plate 101. Then, the guardrail 3 is placed on the movable base 2. Under the guidance of the arc-shaped ends of the two limiting plates 502, the second rotating groove 501 on the mounting platform 5 and the mounting groove 201 on the movable base 2 can be quickly aligned. Then, the guardrail 3 is fixed to the movable base 2 using mounting nails 4.

[0036] When the mounting pin 4 is inserted into the mounting groove 201, the outer wall of the inclined plate 203 will be squeezed by the bottom outer wall of the mounting pin 4 and tilt. At this time, the S-shaped elastic plate 204 is stressed and deforms along its bending direction until the inclined plate 203 slides into the snap-fit ​​groove 401 of the mounting pin 4. Subsequently, the S-shaped elastic plate 204 is no longer stressed, and it recovers its deformation along the bending direction and drives the inclined plate 203 to reset, thereby limiting the mounting pin 4. At the same time, when the mounting pin 4 is inserted, the ejector plate 206 will be resisted by the bottom outer wall of the mounting pin 4 and slide along the inner wall of the mounting groove 201 towards the bottom of the mounting groove 201. At this time, the first spring 205 is stressed and deforms along its bending direction.

[0037] When disassembling the guardrail 3, the worker needs to insert a tool into the inner wall of the sliding cavity 402 of the mounting nail 4, and tap the tool to make it contact the pressing handle 404 and move it towards the bottom of the mounting nail 4. At this time, the second spring 406 is subjected to force and compressed along its elastic direction. The pressing column 405 slides to the bottom along the inner wall of the first sliding groove 409 under the action of the pressing handle 404. The connecting column 407 slides to the bottom along the second clearance groove 403 under the action of the pressing column 405. The abutting cylinder 408 moves to the bottom under the action of the connecting column 407, and contacts the outer wall of the inclined plate 203, causing it to tilt under force. At the same time, the second spring 406 undergoes elastic deformation due to the pressure of the inclined plate 203, releasing the limit on the mounting nail 4. Subsequently, the first spring 205 recovers its elastic deformation, pushing the ejector plate 206 to slide along the inner wall of the mounting groove 201 towards the top outer wall of the movable base 2, ejecting the mounting nail 4 from the mounting groove 201, and the guardrail 3 can be removed.

[0038] Next, slide the three barrier strips 6 along the inner wall of the second sliding groove 301 to the inner wall of the three limiting grooves 302. Then slide the two sliding cylinders 701. When the two sliding cylinders 701 slide along the outer wall of the two sliding plates 801, so that the two U-shaped clamps 7 are engaged in the inner wall of the second sliding groove 301 on the two railings 3, rotate the rotating handle 703 clockwise. The rotating handle 703 rotates and moves along the inner wall of the first threaded hole 702 towards the sliding plate 801. The end of the handle close to the sliding plate 801 abuts against the outer wall of the sliding plate 801 near the first threaded hole 702, thereby fixing the sliding cylinder 701 to the outer wall of the sliding plate 801. Through this operation, the position of the sliding cylinder 701 on the outer wall of the sliding plate 801 can be adjusted according to the distance between the two railings 3. This facilitates the installation of the U-shaped clamps 7 onto the railings 3, provides a fixing effect for the railings 3, and limits the movement of the movable base 2.

[0039] Finally, the three barrier bands 6 are slid into the inner wall of the third sliding groove 803 and pass around the outer wall of the pull rod 904. At this time, the rotating rudder 907 is rotated clockwise. The rotating rudder 907 drives the threaded rod 905 to rotate. The rotating protrusion 906 rotates along the inner wall of the fourth rotating groove 806 with the threaded rod 905. Since the screw cylinder 9 does not rotate with the threaded rod 905 under the limiting action of the sliding column 902, it moves towards the rotating rudder 907. The sliding column 902 slides away from the barrier plate 8 along the inner wall of the fourth sliding groove 805 under the action of the screw cylinder 9. The pull rod 904 moves synchronously with the screw cylinder 9 and pulls the barrier bands 6 to tighten. Then, the water bag 102 is laid flat on the top outer wall of the movable base 2 between the four railings 3, and water is injected into the water bag 102 later.

[0040] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for pre-stressing a cast-in-place box girder support for a side span, characterized in that, Includes the following steps: Step 1: Preparation: Check the support structure and foundation bearing capacity, set up observation points on the top of the support and the foundation surface and measure the initial elevation; Step 2, Pre-compression material installation: First, check the support structure and foundation bearing capacity. Then, mark the water bag placement area on the top plate of the support, plan the drainage path, install the fence and lay the water bags, and finally connect the water injection pipe. Step 3, graded loading and observation: The water injection rate is controlled by valves, and water is injected in stages at 50%, 100%, and 110% load. During this period, the settlement at each observation point is measured regularly. Step 4, Unloading and Data Recording: Unload in reverse order of loading. After unloading 50% of the load, measure the rebound value of the support, record the settlement and rebound data at each stage, and calculate the inelastic deformation and elastic deformation. Step 5, Acceptance and Conclusion: Compile the prestressing data to form a report, analyze the bearing capacity of the support, the elimination of inelastic deformation and elastic deformation parameters. After acceptance, proceed with the box girder pouring construction.

2. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 1, characterized in that, The fence includes a movable base mounted on the surface of the support plate. The overall outline of the movable base is "X" shaped. Several mounting slots arranged in a linear array are symmetrically opened on the top outer wall of both ends of the movable base. Several first clearance slots arranged in a circular array are opened on the inner wall of the mounting slots near the top of the movable base. An inclined plate is fixedly connected to the inner wall of the first clearance slot near the bottom of the movable base. An S-shaped elastic plate is fixedly connected to the end of the inclined plate away from the first clearance slot. A first spring is fixedly connected to the bottom inner wall of the mounting slot. A catapult plate is fixedly connected to the end of the first spring away from the bottom inner wall of the mounting slot. A clearance hole is opened on the top outer wall of the catapult plate. A limiting component is provided to prevent the water bag from shifting during the water injection process, and the limiting component is connected to the movable base.

3. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 2, characterized in that, The limiting component includes a mounting pin inserted into the mounting slot. A sliding cavity is formed on the top outer wall of the mounting pin, and a snap-fit ​​groove is formed on the outer wall of the mounting pin near the bottom end. A pressing handle is slidably connected to the inner wall of the sliding cavity. A first sliding groove is formed on the bottom inner wall of the sliding cavity. A pressing post is fixedly connected to the bottom outer wall of the pressing handle. A second spring is sleeved on the outer wall of the pressing post near the top. Several connecting posts arranged in a circular array are fixedly connected to the outer wall of the pressing post near the middle.

4. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 3, characterized in that, The end of the connecting post away from the pressing post is fixedly connected to an abutment cylinder. A second clearance groove is provided on the outer wall of the mounting nail near the middle. A guardrail is installed on the outer wall of the mounting nail near the middle. The overall outline of the guardrail is a hollow right-angled triangular prism shape.

5. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 4, characterized in that, The top and bottom outer walls of the railing are symmetrically provided with first rotating grooves, and the two outer walls of the railing near the right angle edge are respectively provided with second sliding grooves. The inner wall of the second sliding groove near the middle is provided with a plurality of limiting grooves distributed in a linear array.

6. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 4, characterized in that, The two ends of the railing are symmetrically rotatably connected to mounting platforms. A second rotating groove is provided on the outer wall of the end of the mounting platform away from the railing. Two limiting plates are fixedly connected to the outer wall of the end of the mounting platform away from the railing. A barrier strip is installed on the inner wall of the limiting groove.

7. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 5, characterized in that, A U-shaped clamping plate is installed on the inner wall of the second sliding groove near the bottom. A sliding cylinder is fixedly connected to the outer wall of the U-shaped clamping plate away from the second sliding groove. A first threaded hole is opened on the outer wall of the sliding cylinder away from the U-shaped clamping plate. A sliding plate is slidably connected to the inner wall of the sliding cylinder. A rotating handle is screwed onto the inner wall of the first threaded hole. A blocking plate is fixedly connected to the end of the sliding plate away from the sliding cylinder.

8. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 7, characterized in that, The barrier plate has a third rotating groove on its outer wall near the top and a third sliding groove on its outer wall near the bottom. The inner wall of the third sliding groove near the bottom has rounded corners. A support column is fixedly connected to the outer wall of the barrier plate near the third rotating groove.

9. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 8, characterized in that, A fourth sliding groove is provided on the outer wall of the support column near the top, and a fourth rotating groove is provided on the outer wall of the end of the support column away from the barrier plate. A sliding column is slidably connected to the inner wall of the fourth sliding groove. A sliding circular plate is fixedly connected to one end of the sliding column, and a screw cylinder is fixedly connected to the other end of the sliding column.

10. The pre-stressing method for the cast-in-place box girder support in the side span according to claim 9, characterized in that, A pull rod is fixedly connected to the outer wall of the screw cylinder near the bottom. A second threaded hole is opened on the outer wall of one end of the screw cylinder. A threaded rod is screwed onto the inner wall of the second threaded hole. A rotating rudder is fixedly connected to one end of the threaded rod, and a rotating protrusion is fixedly connected to the other end of the threaded rod.

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