A large-span continuous beam 0 block pre-pressure adjusting device

Abstract

This utility model provides a preload adjustment device for block 0 of a large-span continuous beam, relating to the field of bridge construction technology. It includes: a pier structure; a bracket structure fixedly installed on the outer wall of the pier structure; a pre-embedded bolt pre-installed on the top of the pier structure; a reaction frame structure fixedly installed on the pre-embedded bolt; an emergency unloading plate slidably installed on the top of the bracket structure; travel grooves opened on the front and rear sides of the top of the emergency unloading plate; and a travel slider slidably installed inside the travel grooves. To address jack malfunctions, a quick unloading structure composed of an emergency unloading plate and an emergency unloading bolt is added. In case of malfunction, the jack can be directly slid out from under the reaction frame structure, simultaneously disengaging the positioning pin from its insertion hole to complete disassembly. This avoids prolonged interruptions in preload operations due to inconvenient replacement, solving the problem of long replacement times for a single jack, which easily leads to preload stagnation, bracket stress imbalance, and even endangering structural safety.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a preload adjustment device for block 0 of a long-span continuous beam. Background Technology

[0002] The purpose of preloading block 0 is to test the load-bearing capacity and stability of the support system, eliminate the inelastic deformation of the support system, and observe the amount of elastic deformation to provide a basis for subsequent construction. Currently, the commonly used preloading method is the jack preloading method, which requires the cooperation of a preload adjustment device.

[0003] Currently, most bracket preload adjustment devices are driven by jacks, which are rigidly fixed to the bracket to complete the loading. However, long-term high-pressure operation of jacks is prone to failures such as oil leakage and seal failure, requiring emergency unloading and replacement. Existing fixing methods (such as welding and bolt tightening) are cumbersome to disassemble and take a long time to replace a single unit, which can easily lead to preload stagnation, bracket stress imbalance, and even endanger structural safety. Therefore, it is necessary to optimize the jack fixing and rapid unloading mechanism to ensure the continuity of operation. Summary of the Invention

[0004] This utility model embodiment relates to a preload adjustment device for block 0 of a large-span continuous beam. It comprises an emergency unloading structure consisting of an emergency unloading plate and emergency unloading bolts. In the event of jack damage, this emergency unloading structure allows the jack to be quickly slid out from under the reaction frame structure. After sliding out, the positioning pin disengages from the positioning hole, facilitating jack disassembly and replacement. The disassembly process is simple and does not delay the preload operation due to excessive time spent replacing the jack. Pressure is applied to the reaction frame structure by the jack. Since the reaction frame structure is fixed to the pre-embedded bolts, it cannot be pushed by the jack. Therefore, the jack bears the reaction force of the reaction frame structure, causing the lower end of the jack to apply force to the bracket structure, completing the preload operation of the bracket structure. The preload intensity can be adjusted according to the applied pressure of the jack.

[0005] In a first aspect, this utility model provides a preload adjustment device for block 0 of a large-span continuous beam, specifically comprising: a pier structure; a bracket structure fixedly installed on the outer wall of the pier structure; a pre-embedded bolt pre-installed on the top of the pier structure; a reaction frame structure fixedly installed on the pre-embedded bolt; an emergency unloading plate slidably installed on the top of the bracket structure; a limit plug fixedly installed at the center of the top of the emergency unloading plate; travel grooves opened on the front and rear sides of the top of the emergency unloading plate; a travel slider slidably installed inside the travel grooves; a conversion column fixedly installed at the bottom of the travel slider; a positioning plug fixedly installed at the center of the inner side of the travel slider; an installation base inserted into the limit plug; a jack fixedly installed on the installation base; and positioning holes opened on the front and rear sides of the installation base.

[0006] Preferably, a reinforcing structure is fixedly installed on the inner side of the bracket structure; an emergency unloading bolt is rotatably installed on the reinforcing structure.

[0007] Preferably, a conversion plate is fixedly installed on the front and rear sides of the top of the reinforcing structure; the top of the conversion plate is provided with a conversion guide groove.

[0008] Preferably, one end of the stroke slider is embedded in and installed with a restoring spring; the other end of the restoring spring is embedded in and installed at the outer end of the stroke groove.

[0009] Preferably, the emergency unloading bolt is connected to the emergency unloading plate via threads.

[0010] Preferably, the conversion guide groove consists of an inclined groove and a horizontal groove, with the inner end of the horizontal groove connected to the outer end of the inclined groove.

[0011] Preferably, the conversion column at the bottom of the stroke slider is also slidably mounted inside the conversion guide groove.

[0012] This utility model provides a preload adjustment device for block 0 of a large-span continuous beam, which has the following beneficial effects:

[0013] (i) This utility model applies pressure to the reaction frame structure fixed to the pre-embedded bolt by using a jack. Since the reaction frame structure cannot be displaced, the jack bears the reaction force and transmits it to the bracket structure, thereby realizing the pre-loading of the bracket structure. The pre-loading strength can be flexibly adapted by adjusting the jack pressure.

[0014] (ii) To address jack malfunctions, a quick unloading structure consisting of an emergency unloading plate and an emergency unloading bolt is added. In case of malfunction, the jack can be slid directly out from under the reaction frame structure, and the positioning pin can be disengaged from the socket to complete the disassembly. This simplifies the disassembly process and avoids long-term interruptions in pre-pressing operations due to inconvenience in replacement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0016] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0017] In the attached diagram:

[0018] Figure 1 A schematic diagram of the present invention is shown;

[0019] Figure 2 This utility model illustrates Figure 1 A schematic diagram of the forward-looking perspective;

[0020] Figure 3 A schematic diagram of the bracket structure and reaction frame structure of this utility model is shown;

[0021] Figure 4 A schematic diagram of the emergency unloading plate of this utility model is shown;

[0022] Figure 5 A schematic diagram of the emergency unloading plate of this utility model in disassembled state is shown.

[0023] List of reference numerals

[0024] 1. Pier column structure; 2. Bracket structure; 3. Embedded bolt; 4. Reaction frame structure; 5. Emergency unloading plate; 6. Limiting plug-in column; 7. Stroke slide groove; 8. Stroke slider; 9. Returning spring; 10. Positioning plug-in column; 11. Mounting base; 12. Jack; 13. Positioning plug hole; 14. Reinforcing structure; 15. Emergency unloading bolt; 16. Conversion plate; 17. Conversion guide groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] Please refer to Figures 1 to 5 Example 1:

[0027] This utility model proposes a preload adjustment device for block 0 of a long-span continuous beam, comprising: a pier structure 1, a bracket structure 2 fixedly installed on the outer wall of the pier structure 1; a pre-embedded bolt 3 pre-embedded in the top of the pier structure 1; a reaction frame structure 4 fixedly installed on the pre-embedded bolt 3; an emergency unloading plate 5 slidably installed on the top of the bracket structure 2; a limit plug 6 fixedly installed at the center of the top of the emergency unloading plate 5; travel grooves 7 are opened on the front and rear sides of the top of the emergency unloading plate 5; a travel slider 8 is slidably installed inside the travel groove 7; a conversion column is fixedly installed at the bottom of the travel slider 8; a positioning plug 10 is fixedly installed at the center of the inner side of the travel slider 8; and an installation base is inserted into the limit plug 6. 11; The mounting base 11 is fixedly installed with a jack 12; The mounting base 11 has positioning holes 13 on the front and rear sides, and pre-embedded bolts 3 are pre-embedded on the pier structure 1. The bracket structure 2 and emergency unloading plate 5 and other structures are directly or indirectly installed on the pier structure 1. Then, the reaction frame structure 4 is fixedly installed on the pre-embedded bolts 3. After the installation is completed, the jack 12 is started to push the reaction frame structure 4. When pushing, since the reaction frame structure 4 is fixed on the pre-embedded bolts 3 and the pre-embedded bolts 3 are directly fixed on the pier structure 1, the reaction frame structure 4 cannot be pushed by the jack 12. Instead, the jack 12 will provide the applied pressure to the bracket structure 2, so that the bracket structure 2 is subjected to force to complete the pre-compression work.

[0028] In Example 2, based on Example 1, a reinforcing structure 14 is fixedly installed on the inner side of the bracket structure 2; an emergency unloading bolt 15 is rotatably installed on the reinforcing structure 14; a conversion plate 16 is fixedly installed on the front and rear sides of the top of the reinforcing structure 14; a conversion guide groove 17 is opened on the top of the conversion plate 16. An emergency unloading structure is formed by setting the emergency unloading plate 5 and the emergency unloading bolt 15, etc. After the jack 12 is damaged, the jack 12 can be quickly slid out from under the reaction frame structure 4 through this emergency unloading structure. After sliding out, the positioning pin 10 will disengage from the inside of the positioning hole 13, thus facilitating the... The jack 12 can be disassembled and replaced. The disassembly process is simple and will not take too long to replace the jack 12, thus not delaying the normal operation of the pre-pressing work. If the jack 12 is damaged during pre-pressing, the emergency unloading bolt 15 can be rotated to slide it outward with the emergency unloading plate 5 and the jack 12, so that the jack 12 is away from the underside of the bracket structure 2. During the process of leaving, the conversion column on the stroke slider 8 will use the inclined structure of the conversion guide groove 17 to move the positioning pin 10 outward, so that the positioning pin 10 is disengaged from the positioning hole 13, and the rigid fixation to the mounting base 11 is removed, which makes it easier to replace the damaged jack 12.

[0029] In Example 3, based on Example 2, a restoring spring 9 is embedded on the outer side of the stroke slider 8; the other end of the restoring spring 9 is embedded on the outer end of the stroke groove 7; the emergency unloading bolt 15 is connected to the emergency unloading plate 5 by threads; the conversion guide groove 17 consists of an inclined groove and a horizontal groove, with the inner end of the horizontal groove connected to the outer end of the inclined groove; the conversion column at the bottom of the stroke slider 8 is also slidably installed inside the conversion guide groove 17. Pressure is applied to the reaction frame structure 4 by the jack 12. Since the reaction frame structure 4 is fixed on the pre-embedded bolt 3, it cannot be pushed by the jack 12. Therefore, the jack 12 will bear the reaction force of the reaction frame structure 4, so that the lower end of the jack 12 applies force to the bracket structure 2, completing the pre-compression work of the bracket structure 2, and the pre-compression intensity can be adjusted by the pressure applied by the jack 12.

[0030] Working principle: First, pre-embedded bolts 3 are installed on the pier structure 1. The bracket structure 2 and emergency unloading plate 5 are indirectly or directly fixed to the pier structure 1. Then, the reaction frame structure 4 is fastened to the pre-embedded bolts 3. The jack 12 is started to push the reaction frame structure 4. Since the reaction frame structure 4 and the pre-embedded bolts 3 are both fixed to the pier structure 1, the reaction frame structure 4 cannot be displaced. The reaction force of the jack 12 is transmitted to the bracket structure 2 to complete the pre-loading. If the jack 12 is damaged during the pre-loading process, the emergency unloading bolt 15 can be rotated to drive the emergency unloading plate 5 and the jack 12 to slide outward, so that they are removed from under the bracket structure 2. When sliding, the conversion column of the stroke slider 8 moves outward along the inclined structure of the conversion guide groove 17, which drives the positioning pin 10 to disengage from the positioning pin hole 13, releases the rigid fixation of the mounting base 11, and realizes quick replacement.

[0031] The following points should be noted in this article:

[0032] 1. The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment; other structures can refer to general designs.

[0033] 2. Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0034] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A preload adjustment device for block 0 of a long-span continuous beam, comprising: A pier structure (1) is provided, on the outer wall of which a bracket structure (2) is fixedly installed; a pre-embedded bolt (3) is pre-embedded at the top of the pier structure (1); a reaction frame structure (4) is fixedly installed on the pre-embedded bolt (3); characterized in that an emergency unloading plate (5) is slidably installed at the top of the bracket structure (2); a limit plug-in column (6) is fixedly installed at the center of the top of the emergency unloading plate (5); a travel groove (7) is provided on the front and rear sides of the top of the emergency unloading plate (5); a travel slider (8) is slidably installed inside the travel groove (7); a conversion column is fixedly installed at the bottom of the travel slider (8); a positioning plug (10) is fixedly installed at the center of the inner side of the travel slider (8); an installation base (11) is inserted on the limit plug-in column (6); a jack (12) is fixedly installed on the installation base (11); and positioning holes (13) are provided on the front and rear sides of the installation base (11).

2. The preload adjustment device for block 0 of a large-span continuous beam according to claim 1, characterized in that, A reinforcing structure (14) is fixedly installed on the inner side of the bracket structure (2); an emergency unloading bolt (15) is rotatably installed on the reinforcing structure (14).

3. The preload adjustment device for block 0 of a large-span continuous beam according to claim 2, characterized in that, The front and rear sides of the top of the reinforcing structure (14) are fixedly installed with conversion plates (16); the top of the conversion plates (16) is provided with conversion guide grooves (17).

4. The preload adjustment device for block 0 of a large-span continuous beam according to claim 3, characterized in that, One end of the return spring (9) is embedded in the outer side of the stroke slider (8); the other end of the return spring (9) is embedded in the outer end of the stroke groove (7).

5. The preload adjustment device for block 0 of a large-span continuous beam according to claim 4, characterized in that, The emergency unloading bolt (15) is connected to the emergency unloading plate (5) by threads.

6. The preload adjustment device for block 0 of a large-span continuous beam according to claim 5, characterized in that, The conversion guide groove (17) consists of an inclined groove and a horizontal groove, with the inner end of the horizontal groove connected to the outer end of the inclined groove.

7. The preload adjustment device for block 0 of a large-span continuous beam according to claim 6, characterized in that, The conversion column at the bottom of the stroke slider (8) is also slidably installed inside the conversion guide groove (17).

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