Auxiliary device for preventing tensioning end of prefabricated box girder from cracking
By designing an auxiliary device including a buffer assembly, the problem of excessive stress on both ends due to arching of the central part during tensioning construction is solved, and effective buffering and dispersion of end stress is achieved, and construction quality is improved.
Patent Information
- Application Number
- CN202420520590.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-03-18
AI Technical Summary
During the tensioning process, the center part of the prefabricated box beam arches upward, causing greater stress at both ends, which is more likely to occur in cracks or damage, reducing the construction quality of the prefabricated box beam.
An auxiliary device is designed, including a prefabricated box beam body and a base film, with a lifting section and a support block in the middle of the base film, and a buffer assembly is provided on the top. The buffer assembly consists of a mounting block, a buffer plate, an auxiliary telescopic rod, an auxiliary spring, a first clamp block and a second clamp block, through which the end stress is buffered and dispersed.
Through the preliminary cushioning of the buffer assembly and the elastic reaction of multiple auxiliary springs, the end stress at both ends of the prefabricated box girder is effectively reduced, the risk of cracking or damage is reduced, and the construction quality of the prefabricated box girder is improved.
Smart Images
Figure CN222844411U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of highway construction, in particular to an auxiliary device for preventing the tensioning end of a prefabricated box beam from cracking. Background Art
[0002] Box girders of reinforced concrete structures are divided into prefabricated box girders and cast-in-place box girders. Box girders prefabricated in an independent site can be erected with a bridge erection machine after the lower part of the project is completed, which can speed up the project progress and save construction time; cast-in-place box girders are mostly used for large continuous bridges.
[0003] The production process of box girder includes the installation of box girder formwork, the installation of box girder bottom plate reinforcement, the installation of box girder inner formwork, the installation of box girder top plate reinforcement, pouring concrete, demoulding, tensioning, grouting, and anchor sealing. During the box girder tensioning construction process, the box girder is placed on the box girder bottom formwork. Since the bottom formwork adopts a steel pedestal, the stress at the arched end of the box girder cannot be released during the tensioning process of the prefabricated box girder, and there is no steel structure support at both ends of the prefabricated box girder. Therefore, during the tensioning construction process, the center of the prefabricated box girder arches upward, causing the two ends to be subjected to greater force, which is more likely to crack or break due to extrusion, reducing the construction quality of the prefabricated box girder and has certain limitations.
[0004] An auxiliary device for preventing the tensioning end of a prefabricated box girder from cracking is proposed, so as to solve the above-mentioned problems. Utility Model Content
[0005] The purpose of the utility model is to provide an auxiliary device for preventing the tensioning ends of prefabricated box girders from cracking, so as to solve the problem that during the tensioning construction process, the central part of the prefabricated box girders arches upward, causing the two ends to be subjected to greater force, making it easier to crack or break due to extrusion, thereby reducing the construction quality of the prefabricated box girders.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an auxiliary device for preventing cracking of the tensioned end of a prefabricated box beam, comprising a prefabricated box beam body and a bottom membrane, wherein a beam lifting section is provided in the middle of the bottom membrane;
[0007] A support block is symmetrically fixed in the middle of the bottom film, and a buffer component is arranged on the top of the bottom film;
[0008] Also includes:
[0009] The buffer assembly comprises a mounting block, a buffer plate is connected to the upper part of the mounting block, and an auxiliary telescopic rod is fixedly connected to the inner bottom surface of the mounting block;
[0010] Wherein, the top end of the telescopic portion of the auxiliary telescopic rod is fixedly connected to the bottom of the buffer plate, and the inner bottom surface of the mounting block is fixedly connected with an auxiliary spring;
[0011] Wherein, side plates are fixedly connected to both sides of the mounting block, a first groove is provided on the upper portion of the side plate on one side, and a first clamping block is fixedly connected to the lower portion of the side plate on one side.
[0012] Preferably, the buffer plate is slidably connected to the mounting block, a plurality of auxiliary telescopic rods are evenly arranged, and the number of the auxiliary telescopic rods is no less than six, and the top of the auxiliary spring is fixedly connected to the bottom of the buffer plate.
[0013] Preferably, the auxiliary springs and the auxiliary telescopic rods are spaced apart, the number of the auxiliary springs is no less than six, the height of the side plate is lower than the height of the mounting block, and the number of the first grooves is no less than four.
[0014] Preferably, the first clamping block and the first groove are located on the same vertical line, the upper portion of the side plate on the other side is fixedly connected with the second clamping block, and the lower portion of the side plate on the other side is provided with a second groove.
[0015] Preferably, the second clamping block is engaged with the first groove, the first clamping block is engaged with the second groove, the number of the second clamping blocks matches the number of the first groove, and the number of the first clamping blocks matches the number of the second groove.
[0016] Preferably, the length of the mounting block is greater than the width of the prefabricated box girder body, the length of the buffer plate is greater than the width of the prefabricated box girder body, and mounting ears are fixedly connected to the front and back sides of the mounting block, and the bottom of the mounting ears fits with the top of the prefabricated box girder body.
[0017] Preferably, threaded holes are symmetrically provided inside the mounting ears, fastening bolts are installed inside the threaded holes, and the mounting block is mounted on the prefabricated box girder body through the fastening bolts.
[0018] Compared with the prior art, the utility model has the following beneficial effects: by setting a buffer assembly, the buffer assembly includes a mounting block, a buffer plate, an auxiliary telescopic rod, an auxiliary spring, a first clamping block and a second clamping block, and the buffer plate adopts a hard rubber plate, which can initially buffer the end stress, and the elastic force of multiple auxiliary springs further buffers the end stress at both ends of the prefabricated box beam body, thereby reducing the cracking or damage of the two ends of the prefabricated box beam body. The specific contents are as follows:
[0019] 1. By setting a buffer component, the buffer component includes a mounting block, a buffer plate, an auxiliary telescopic rod, an auxiliary spring, a first clamping block and a second clamping block. During the tensioning construction, the two ends of the prefabricated box girder body are subjected to greater force, so that the prefabricated box girder body squeezes the buffer plate. The buffer plate adopts a hard rubber plate, which can initially buffer the end stress. Then, the buffer plate squeezes the auxiliary telescopic rod and the auxiliary spring, so that the auxiliary telescopic rod descends and the auxiliary spring is compressed downward. The elastic force of multiple auxiliary springs reacts on the buffer plate, thereby further buffering the end stress at both ends of the prefabricated box girder body, reducing the cracking or damage of the two ends of the prefabricated box girder body, improving the construction quality of the prefabricated box girder body, and solving the problem that during the tensioning construction process, the center of the prefabricated box girder arches upward, causing the two ends to be subjected to greater force, which is more likely to crack or break due to extrusion, thereby reducing the construction quality of the prefabricated box girder.
[0020] 2. A side plate, a first groove, a first clamping block, a second clamping block and a second groove are provided. When used specifically, a plurality of mounting blocks can be selected for use in combination according to the length of the prefabricated box girder body. By inserting the first clamping block into the second groove and the second clamping block into the first groove, it is convenient to combine the mounting blocks for use, thereby increasing the contact surface at both ends of the prefabricated box girder body, so that the end stress is better dispersed, and it can be flexibly selected, reducing the influence of the end stress on the prefabricated box girder body. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model in front section;
[0022] Figure 2 It is a schematic diagram of the overall structure of the side section of the utility model;
[0023] Figure 3 For this utility model Figure 1 A is an enlarged structural diagram;
[0024] Figure 4 For this utility model Figure 2 The enlarged structural diagram at B in FIG.
[0025] Figure 5 It is a schematic diagram of the overall structure of the utility model from a side view.
[0026] In the figure: 1. prefabricated box girder body; 2. bottom membrane; 3. beam lifting section; 4. support block; 5. mounting block; 6. buffer plate; 7. auxiliary telescopic rod; 8. auxiliary spring; 9. mounting ear; 10. fastening bolt; 11. side plate; 12. first groove; 13. first clamping block; 14. second clamping block; 15. second groove. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] See also Figure 1-5 The utility model provides a technical solution: an auxiliary device for preventing the prefabricated box girder from cracking at the tensioning end, comprising a prefabricated box girder body 1 and a bottom membrane 2, wherein a lifting beam section 3 is provided in the middle of the bottom membrane 2.
[0029] A support block 4 is symmetrically fixed to the middle of the bottom film 2 , and a buffer component is arranged on the top of the bottom film 2 .
[0030] The buffer assembly includes a mounting block 5, the length of which is greater than the width of the prefabricated box beam body 1, a buffer plate 6 is connected to the upper part of the interior of the mounting block 5, the length of the buffer plate 6 is greater than the width of the prefabricated box beam body 1, the buffer plate 6 is slidably connected to the mounting block 5, and an auxiliary telescopic rod 7 is fixedly connected to the inner bottom surface of the mounting block 5.
[0031] Among them, multiple auxiliary telescopic rods 7 are evenly arranged, and the number of auxiliary telescopic rods 7 is not less than six. The top of the telescopic part of the auxiliary telescopic rod 7 is fixedly connected to the bottom of the buffer plate 6, and the inner bottom surface of the mounting block 5 is fixedly connected with an auxiliary spring 8.
[0032] The top of the auxiliary spring 8 is fixedly connected to the bottom of the buffer plate 6 , and the auxiliary spring 8 and the auxiliary telescopic rod 7 are distributed at intervals, and there are no less than six auxiliary springs 8 .
[0033] The front and back sides of the mounting block 5 are fixedly connected with mounting ears 9, the bottom of the mounting ears 9 is in contact with the top of the prefabricated box beam body 1, and threaded holes are symmetrically provided inside the mounting ears 9. Fastening bolts 10 are installed inside the threaded holes. The mounting block 5 is installed on the prefabricated box beam body 1 through the fastening bolts 10.
[0034] The mounting block 5 has side panels 11 fixedly connected to both sides, a first groove 12 is provided on the upper portion of the side panel 11 on one side, a first clamping block 13 is fixedly connected to the lower portion of the side panel 11 on one side, and the first clamping block 13 and the first groove 12 are located on the same vertical line.
[0035] A side plate 11, a first groove 12, a first clamping block 13, a second clamping block 14 and a second groove 15 are provided. When used specifically, a plurality of mounting blocks 5 can be selected for combined use according to the length of the prefabricated box girder body 1. By inserting the first clamping block 13 into the second groove 15 and the second clamping block 14 into the first groove 12, it is convenient to combine the mounting blocks 5 for use, thereby increasing the contact surface at both ends of the prefabricated box girder body 1, so that the end stress is better dispersed, can be flexibly selected, and the influence of the end stress on the prefabricated box girder body 1 is reduced.
[0036] A second clamping block 14 is fixedly connected to the upper portion of the side plate 11 on the other side, and the second clamping block 14 is clamped and connected with the first groove 12. A second groove 15 is opened at the lower portion of the side plate 11 on the other side, and the first clamping block 13 is clamped and connected with the second groove 15. The number of the second clamping blocks 14 matches the first groove 12, and the number of the first clamping blocks 13 matches the second groove 15.
[0037] By setting a buffer component, the buffer component includes a mounting block 5, a buffer plate 6, an auxiliary telescopic rod 7, an auxiliary spring 8, a first clamping block 13 and a second clamping block 14. During tensioning construction, the two ends of the prefabricated box girder body 1 are subjected to greater force, so that the prefabricated box girder body 1 squeezes the buffer plate 6. The buffer plate 6 is made of a hard rubber plate, which can provide preliminary buffering for the end stress.
[0038] Then, the buffer plate 6 squeezes the auxiliary telescopic rod 7 and the auxiliary spring 8, causing the auxiliary telescopic rod 7 to drop and the auxiliary spring 8 to compress downward. The elastic force of the multiple auxiliary springs 8 reacts on the buffer plate 6, thereby further buffering the end stress at both ends of the prefabricated box girder body 1, reducing the cracking or damage at both ends of the prefabricated box girder body 1, improving the construction quality of the prefabricated box girder body 1, and solving the problem that during the tensioning construction process, the center of the prefabricated box girder arches upward, causing the two ends to be subjected to greater force, which is more likely to crack or break due to squeezing, thereby reducing the construction quality of the prefabricated box girder.
[0039] Working principle:
[0040] Before using this auxiliary device to prevent cracking of the tensioned end of the prefabricated box girder, it is necessary to first check the overall condition of the device to ensure that it can work normally. Figure 1 - Figure 5As shown, during the tensioning construction, the two ends of the prefabricated box girder body 1 are subjected to greater force, so that the prefabricated box girder body 1 squeezes the buffer plate 6. The buffer plate 6 is made of a hard rubber plate, which can initially buffer the end stress. Then, the buffer plate 6 squeezes the auxiliary telescopic rod 7 and the auxiliary spring 8, so that the auxiliary telescopic rod 7 drops and the auxiliary spring 8 is compressed downward. The elastic force of multiple auxiliary springs 8 reacts on the buffer plate 6, thereby further buffering the end stress at both ends of the prefabricated box girder body 1, reducing the cracking or damage at both ends of the prefabricated box girder body 1 and improving the construction quality of the prefabricated box girder body 1.
[0041] During specific use, according to the length of the prefabricated box girder body 1, multiple mounting blocks 5 can be selected for use in combination. By inserting the first clamping block 13 into the second groove 15 and the second clamping block 14 into the first groove 12, it is convenient to combine the mounting blocks 5 for use, thereby increasing the contact surface at both ends of the prefabricated box girder body 1, so that the end stress is better dispersed, can be flexibly selected, and reduce the influence of the end stress on the prefabricated box girder body 1.
[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. An auxiliary device for preventing cracking of the tensioned end of a prefabricated box beam, comprising a prefabricated box beam body (1) and a bottom membrane (2), wherein a beam lifting section (3) is provided in the middle of the bottom membrane (2); A support block (4) is symmetrically fixed in the middle of the bottom film (2), and a buffer component is arranged on the top of the bottom film (2); It is characterized in that Also includes: The buffer assembly comprises a mounting block (5), a buffer plate (6) is connected to the upper part of the interior of the mounting block (5), and an auxiliary telescopic rod (7) is fixedly connected to the inner bottom surface of the mounting block (5); The top end of the telescopic portion of the auxiliary telescopic rod (7) is fixedly connected to the bottom of the buffer plate (6), and the inner bottom surface of the mounting block (5) is fixedly connected to an auxiliary spring (8); Wherein, side plates (11) are fixedly connected to both sides of the mounting block (5), a first groove (12) is provided on the upper portion of the side plate (11) on one side, and a first clamping block (13) is fixedly connected to the lower portion of the side plate (11) on one side.
2. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box girder according to claim 1 is characterized in that: The buffer plate (6) is slidably connected to the mounting block (5), a plurality of auxiliary telescopic rods (7) are evenly arranged, and the number of the auxiliary telescopic rods (7) is not less than six, and the top end of the auxiliary spring (8) is fixedly connected to the bottom end of the buffer plate (6).
3. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box girder according to claim 2 is characterized in that: The auxiliary springs (8) and the auxiliary telescopic rods (7) are distributed at intervals, the number of the auxiliary springs (8) is no less than six, the height of the side plate (11) is lower than the height of the mounting block (5), and the number of the first grooves (12) is no less than four.
4. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box beam according to claim 3 is characterized in that: The first clamping block (13) and the first groove (12) are located on the same vertical line, the upper part of the side plate (11) on the other side is fixedly connected with a second clamping block (14), and the lower part of the side plate (11) on the other side is provided with a second groove (15).
5. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box girder according to claim 4, characterized in that: The second clamping block (14) is clamped and connected with the first groove (12), and the first clamping block (13) is clamped and connected with the second groove (15). The number of the second clamping blocks (14) matches the number of the first groove (12), and the number of the first clamping blocks (13) matches the number of the second groove (15).
6. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box beam according to claim 5, characterized in that: The length of the mounting block (5) is greater than the width of the prefabricated box beam body (1), the length of the buffer plate (6) is greater than the width of the prefabricated box beam body (1), and mounting ears (9) are fixedly connected to the front and back sides of the mounting block (5), and the bottom of the mounting ears (9) is in contact with the top of the prefabricated box beam body (1).
7. The auxiliary device for preventing cracking of the tensioned end of a prefabricated box beam according to claim 6, characterized in that: The mounting ears (9) are symmetrically provided with threaded holes, and fastening bolts (10) are installed inside the threaded holes. The mounting block (5) is installed on the prefabricated box beam body (1) via the fastening bolts (10).