A non-removable formwork curing device for concrete walls

Abstract

This invention discloses a non-removable formwork curing device for concrete walls, comprising a wall and an outer support plate and an inner support plate disposed on one side of the wall. A support frame is fixedly mounted on the outer wall of the outer support plate, and through holes are provided at both the upper and lower ends of the outer support plate. Multiple snap-fit ​​telescopic rods are uniformly fixedly mounted on the inner wall of the outer support plate. A fixed support plate is fixedly mounted on one side of the inner support plate. This invention relates to the field of engineering construction technology. This non-removable formwork curing device for concrete walls effectively reduces the economic pressure of normal formwork turnover. Furthermore, by adopting a prefabricated method, it eliminates the need for temporary assembly by workers to support the wall, reducing assembly time and increasing efficiency. By reducing assembly time, it balances the issues between the time required for wall curing with formwork and the need for high-frequency formwork turnover in engineering projects. Multiple methods simultaneously meet the requirements of both wall curing with formwork and the need for high-frequency formwork turnover in engineering projects.

Description

Technical Field

[0001] This invention relates to the field of engineering construction technology, specifically a non-removable formwork curing device for concrete walls. Background Technology

[0002] Formwork-in-place curing of concrete walls refers to appropriately extending the formwork removal time after the concrete wall structure is poured. The formwork is used to insulate and moisturize the concrete structure, preventing cracking. On one hand, the formwork provides excellent moisture retention; its close contact with the concrete surface is equivalent to covering it with a thick film, reducing surface moisture evaporation. On the other hand, the thin formwork also provides insulation, preventing excessively rapid cooling and thermal stress. This is especially important for walls facing sudden drops in external temperature or those on windward sides; the formwork removal time should be strictly controlled, and appropriate insulation measures should be taken when necessary. Generally, ordinary concrete walls require at least 3 days of formwork-in-place curing, while large-volume concrete walls require 14 days.

[0003] While existing construction practices involving curing with formwork are convenient and simple, they consume formwork for extended periods, hindering its reuse. Modern construction companies prioritize speed and formwork turnover, making effective curing with formwork difficult. This is particularly true for the construction of large quantities of small-area concrete walls. To save costs, contractors often increase formwork turnover, resulting in substandard final quality concrete walls that require additional compensation and filling.

[0004] To address these issues, the present invention provides a non-removable formwork curing device for concrete walls. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a non-removable formwork curing device for concrete walls, which solves the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a non-removable formwork curing device for concrete walls, comprising a wall and an outer support plate and an inner support plate disposed on one side of the wall. A support frame is fixedly mounted on the outer wall of the outer support plate, and through holes are provided at both the upper and lower ends of the outer support plate. Multiple snap-fit ​​telescopic rods are uniformly fixedly mounted on the inner wall of the outer support plate. A fixed support plate is fixedly mounted on one side of the inner support plate, and the fixed support plate is tightly fitted to the wall. A first inner plate and a second inner plate are slidably mounted within the inner support plate via a sliding assembly. Multiple grooves are provided on the side walls of both the fixed support plate and the first inner plate, and expansion springs are fixedly mounted within each groove. The fixed support plate, the first inner plate, and the second inner plate are all fixedly connected to each other by a spring. Screw holes are provided at both the upper and lower ends of the fixed support plate, the first inner plate, and the second inner plate, with screws threaded into these holes. Fixed slide rails are evenly fixed on the side wall of the second inner plate away from the wall. A second connecting rod is rotatably connected to the lower end of the fixed slide rail, and a first connecting rod is rotatably connected to the end of the second connecting rod away from the fixed slide rail. The other end of the first connecting rod is movably connected within the fixed slide rail. An automatic positioning support structure is also provided between the end of the first connecting rod and the fixed slide rail. The automatic positioning support structure includes an elastic snap-fit ​​component and a trigger component.

[0007] Preferably, the sliding assembly includes a slider fixedly disposed on the sidewalls of the first inner plate and the second inner plate, and the sidewall of the inner support plate is provided with a matching groove, the slider being slidably disposed in the groove, and the slider and the groove being configured in a matching T-shape.

[0008] Preferably, a limiting plate is fixedly provided at each of the four corners of the side of the inner support plate away from the wall, and the limiting plate is provided corresponding to the second inner plate.

[0009] Preferably, the elastic snap-fit ​​assembly includes fixed blocks spaced apart and fixedly disposed on both sides of the fixed slide rail. A movable groove is fixedly provided on one side wall of the fixed block near the fixed slide rail. A movable plate is slidably disposed in the movable groove. A movable spring is fixedly disposed between the movable plate and the bottom wall of the movable groove. A movable rod is fixedly disposed on the other side wall of the movable plate. Snap-fit ​​holes matching the movable rod are provided on both side walls of the fixed slide rail.

[0010] Preferably, the triggering component includes a sliding cavity disposed on the outer walls of both sides of the fixed slide rail, a sliding plate slidably disposed in the sliding cavity, a stop block fixedly disposed on the side wall of the sliding plate, a tension spring fixedly disposed between the sliding plate and the lower side wall of the sliding cavity, the stop block and the snap-fit ​​hole being correspondingly disposed, and the stop block and the snap-fit ​​telescopic rod being corresponding to each other.

[0011] Preferably, the inner support plate and the fixed support plate are integrally formed.

[0012] Preferably, a counterweight bar is slidably provided inside the upper end of the fixed slide rail, and the counterweight bar is located at the upper end of the first connecting rod.

[0013] Preferably, the outer diameter of the inner support plate is equal to the inner diameter of the outer support plate, and the inner support plate and the outer support plate are fixedly connected by nails.

[0014] Beneficial effects

[0015] This invention provides a non-removable formwork curing device for concrete walls. Compared with the prior art, it has the following advantages:

[0016] (1) The concrete wall curing device without demolding uses a movable rod to squeeze a movable spring. One end of the movable rod pushes the movable plate against the bottom wall of the movable groove, so that the side walls of the outer support plate and the inner support plate and the side wall of the fixed slide rail abut against each other. There is an air wall between the outer support plate and the second inner plate. Compared with traditional wall molds, the constant temperature effect is better, which can effectively avoid the concrete wall surface from cooling down too quickly and generating thermal stress. It can shorten the curing time of the concrete wall with the mold and improve the construction efficiency.

[0017] (2) The concrete wall curing device without demolding, through the action of the first inner plate and the second inner plate under the action of the spring, as the slider slides in the groove, creates an air gap between the fixed support plate, the first inner plate and the second inner plate, which can continue to maintain the constant temperature of the wall. At the same time, the multiple air gaps balance the problem of the reduced constant temperature effect caused by the removal of the outer support plate.

[0018] (3) The concrete wall curing device without demolding can press one end of the first and second connecting rods on the ground by moving the counterweight down, thereby achieving stable support for the second inner plate and the inner support plate. The movable rod limits the sliding distance of one end of the first connecting rod, so that the device can also achieve the supporting function in some terrains similar to field ridges, increasing the applicability of the device. This method effectively reduces the economic pressure of normal formwork turnover. At the same time, the prefabricated method eliminates the need for workers to temporarily build to support the wall, reducing the assembly time in the project and increasing efficiency. By reducing the assembly time, the problem between the time required for wall curing with formwork and the turnover of formwork can be balanced. Multiple methods can simultaneously meet the needs of wall curing with formwork and the high frequency turnover of formwork required in the project. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a non-removable formwork curing device for concrete walls proposed in this invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure at point A;

[0021] Figure 3 This is a three-dimensional structural diagram of the other side of a non-removable formwork curing device for concrete walls proposed in this invention.

[0022] Figure 4 This is a three-dimensional structural diagram and a partial enlarged view of the inner support plate in a non-removable formwork curing device for concrete walls proposed in this invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the structure at point B;

[0024] Figure 6 This is a three-dimensional structural diagram and a partial enlarged view of the other side of the inner support plate in a concrete wall curing device that does not require demolding, as proposed in this invention.

[0025] Figure 7 This is a schematic diagram of the transverse cross-sectional structure of the inner support plate in a non-removable formwork curing device for concrete walls proposed in this invention.

[0026] Figure 8 yes Figure 7 A schematic diagram of the structure at point C.

[0027] In the diagram: 1. Wall; 2. Outer support plate; 3. Support frame; 4. Through hole; 5. Inner support plate; 6. Slide groove; 7. Limiting plate; 8. First connecting rod; 9. Second connecting rod; 10. Fixed slide rail; 11. Counterweight bar; 12. Fixed block; 13. Movable groove; 14. Slide cavity; 15. Sliding plate; 16. Stop block; 17. Tension spring; 18. Snap-fit ​​telescopic rod; 19. Fixed support plate; 20. First inner plate; 21. Second inner plate; 22. Movable rod; 23. Screw hole; 24. Screw; 25. Groove; 26. Spreading spring; 27. Slider; 28. Movable plate; 29. ​​Movable spring. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1:

[0030] Please see Figure 1-8A non-removable formwork curing device for concrete walls includes a wall 1 and an outer support plate 2 and an inner support plate 5 disposed on one side of the wall 1. The outer diameter of the inner support plate 5 is equal to the inner diameter of the outer support plate 2, and the inner support plate 5 and the outer support plate 2 are fixedly connected by nails, so that when the outer support plate 2 and the inner support plate 5 are fixed together, no large gaps are formed on their surfaces, effectively protecting the cured wall 1. At the same time, the nail fixing facilitates the subsequent separation of the outer support plate 2 and the inner support plate 5. A support frame 3 is fixedly provided on the outer wall of the outer support plate 2, and through holes 4 are opened at the upper and lower ends of the outer support plate 2. Multiple clips are evenly fixed on the inner wall of the outer support plate 2. Connecting to the telescopic rod 18, a fixed support plate 19 is fixedly installed on one side of the inner support plate 5. The inner support plate 5 and the fixed support plate 19 are integrally formed, ensuring that the maintenance quality of the wall 1 is not affected by the presence of gaps during the maintenance process. At the same time, it can also ensure that the fixed support plate 19 and the side wall of the wall 1 are always in a tight fit. The fixed support plate 19 and the wall 1 are in a tight fit. A first inner plate 20 and a second inner plate 21 are also slidably installed in the inner support plate 5 through a sliding component. Multiple grooves 25 are opened on the side walls of the fixed support plate 19 and the first inner plate 20. Each groove 25 is fixed with a spreading spring 26. The fixed support plate 19, the first inner plate 20 and the second inner plate 21 are slidably installed in the inner support plate 5. Plate 20 and the second inner plate 21 are both fixedly connected to each other by a spreading spring 26. Limiting plates 7 are fixed at the four corners of the side of the inner support plate 5 away from the wall 1. The limiting plates 7 are correspondingly set to the second inner plate 21 to limit the maximum movement distance of the second inner plate 21 and prevent it from falling off. Screw holes 23 are provided at both the upper and lower ends of the fixed support plate 19, the first inner plate 20, and the second inner plate 21, with screws 24 threaded into the screw holes 23. Fixed slide rails 10 are evenly fixed on the side wall of the second inner plate 21 away from the wall 1. A second connecting rod 9 is rotatably connected to the lower end of the fixed slide rail 10. The second connecting rod 9 is located away from the fixed slide rail 10. The first connecting rod 8 is rotatably provided at one end, and the other end of the first connecting rod 8 is movably connected in the fixed slide rail 10. The upper end of the fixed slide rail 10 is also slidably provided with a counterweight bar 11. The counterweight bar 11 is located at the upper end of the end of the first connecting rod 8. An automatic positioning support structure is also provided between the end of the first connecting rod 8 and the fixed slide rail 10. The automatic positioning support structure includes an elastic snap-fit ​​component and a trigger component. The screw 24 is screwed into the screw hole 23 in advance to connect the fixed support plate 19, the first inner plate 20 and the second inner plate 21 together, so that the spreading spring 26 is squeezed in the groove 25. Then the outer support plate 2 is sleeved on the inner support plate 5 and fixed together by nailing.

[0031] At this time, the upper end of the first connecting rod 8 is at the upper end of the fixed slide rail 10, the counterweight bar 11 is pushed above the first connecting rod 8, and the locking hole is blocked by the stop block 16. The tension spring 17 is in a stretched state, and the lower wall of the stop block 16 and the upper wall of the locking telescopic rod 18 are locked together. Under the action of the locking telescopic rod 18, the stop block 16 cannot move downward under the action of the tension spring 17. At the same time, one end of the movable rod 22 is against the outer wall of the stop block 16, the movable rod 22 squeezes the movable spring 29, and one end of the movable rod 22 pushes the movable plate 28 at the bottom wall of the movable groove 13, so that one side wall of the outer support plate 2 and the inner support plate 5 and the side wall of the fixed slide rail 10 are against each other. There is an air wall between the outer support plate 2 and the second inner plate 21. Compared with the traditional wall formwork, the constant temperature effect is better, effectively avoiding the rapid cooling of the concrete wall surface and the generation of thermal stress, which can shorten the curing time of the concrete wall with the formwork and improve the construction efficiency.

[0032] When template turnover is required in a short period of time, the outer support plate 2 and inner support plate 5 can be separated by removing the rivets. Then, the screws 24 can be unscrewed from the screw holes 23 through the through holes 4 on the side wall of the outer support plate 2. Under the action of the spreading spring 26, the first inner plate 20 and the second inner plate 21 slide in the slide groove 6 as the slider 27 slides. An air gap is generated between the fixed support plate 19, the first inner plate 20 and the second inner plate 21. While the wall 1 can continue to be kept at a constant temperature, the multiple air gaps balance the problem of the reduced template thickness and reduced temperature control effect caused by removing the outer support plate 2.

[0033] Example 2:

[0034] Please see Figure 1-8 This embodiment provides a technical solution based on embodiment one: the sliding component includes a slider 27 fixedly disposed on the side wall of the first inner plate 20 and the second inner plate 21, and a matching groove 6 is provided in the side wall of the inner support plate 5. The slider 27 is slidably disposed in the groove 6, and the slider 27 and the groove 6 are matched in a T-shape.

[0035] The elastic snap-fit ​​assembly includes fixed blocks 12 that are fixedly disposed at intervals on both sides of the fixed slide rail 10. A movable groove 13 is fixedly provided on one side wall of the fixed block 12 near the fixed slide rail 10. A movable plate 28 is slidably disposed in the movable groove 13. A movable spring 29 is fixedly disposed between the movable plate 28 and the bottom wall of the movable groove 13. A movable rod 22 is fixedly disposed on the other side wall of the movable plate 28. Snap-fit ​​holes matching the movable rod 22 are provided on both side walls of the fixed slide rail 10.

[0036] The triggering component includes a sliding cavity 14 disposed on the outer walls of both sides of the fixed slide rail 10, a sliding plate 15 slidably disposed in the sliding cavity 14, a stop block 16 fixedly disposed on the side wall of the sliding plate 15, a tension spring 17 fixedly disposed between the sliding plate 15 and the lower side wall of the sliding cavity 14, the stop block 16 and the snap-fit ​​hole are correspondingly disposed, and the stop block 16 and the snap-fit ​​telescopic rod 18 correspond to each other;

[0037] As the outer support plate 2 is removed, the compressed portion of the snap-fit ​​telescopic rod 18 gradually extends until it reaches its maximum length and separates from the stop block 16. At this point, under the action of the tension spring 17, the stop block 16 is pulled away from the snap-fit ​​hole, and the compressed movable spring 29 extends, causing the movable rod 22 to insert into the fixed slide rail 10. Simultaneously, without the limitation of the outer support plate 2, the counterweight 11 presses one end of the first connecting rod 8 downwards until it reaches the movable rod 22. At this point, the first connecting rod 8 and the second connecting rod 9 can support the second inner plate 21. As the counterweight 11 moves downwards, it can press the ends of the first connecting rod 8 and the second connecting rod 9 on the ground onto the ground, thus... The device provides stable support for the second inner plate 21 and the inner support plate 5. The movable rod 22 limits the sliding distance of one end of the first connecting rod 8, allowing the device to provide support even on terrains similar to field ridges, thus increasing its applicability. This method effectively reduces the economic pressure of normal template turnover. At the same time, the prefabricated method eliminates the need for temporary construction by workers to support the wall 1, reducing assembly time and increasing efficiency. By reducing assembly time, the problem between the time required for wall 1 to be cured with the formwork and the turnover of the template is balanced. Multiple methods are used simultaneously to meet the needs of wall 1 for curing with the formwork and the high frequency of template turnover required in the project.

[0038] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0039] When using the device, screws 24 are screwed into screw holes 23 in advance to connect the fixed support plate 19, the first inner plate 20 and the second inner plate 21 together, so that the spreading spring 26 is squeezed into the groove 25. Then the outer support plate 2 is sleeved on the inner support plate 5 and fixed together by nailing.

[0040] At this time, the upper end of the first connecting rod 8 is at the upper end of the fixed slide rail 10, the counterweight bar 11 is pushed above the first connecting rod 8, and the locking hole is blocked by the stop block 16. The tension spring 17 is in a stretched state, and the lower wall of the stop block 16 and the upper wall of the locking telescopic rod 18 are locked together. Under the action of the locking telescopic rod 18, the stop block 16 cannot move downward under the action of the tension spring 17. At the same time, one end of the movable rod 22 is against the outer wall of the stop block 16, the movable rod 22 squeezes the movable spring 29, and one end of the movable rod 22 pushes the movable plate 28 at the bottom wall of the movable groove 13, so that one side wall of the outer support plate 2 and the inner support plate 5 and the side wall of the fixed slide rail 10 are against each other. There is an air wall between the outer support plate 2 and the second inner plate 21. Compared with the traditional wall formwork, the constant temperature effect is better, effectively avoiding the rapid cooling of the concrete wall surface and the generation of thermal stress, which can shorten the curing time of the concrete wall with the formwork and improve the construction efficiency.

[0041] When template turnover is required in a short period of time, the outer support plate 2 and inner support plate 5 can be separated by removing the rivets. Then, the screws 24 can be unscrewed from the screw holes 23 through the through holes 4 on the side wall of the outer support plate 2. Under the action of the spreading spring 26, the first inner plate 20 and the second inner plate 21 slide in the slide groove 6 as the slider 27 slides. An air gap is generated between the fixed support plate 19, the first inner plate 20 and the second inner plate 21. While the wall 1 can continue to be kept at a constant temperature, the multiple air gaps balance the problem of the reduced template thickness and reduced constant temperature effect caused by removing the outer support plate 2.

[0042] As the outer support plate 2 is removed, the compressed portion of the snap-fit ​​telescopic rod 18 gradually extends until it reaches its maximum length and separates from the stop block 16. At this point, under the action of the tension spring 17, the stop block 16 is pulled away from the snap-fit ​​hole, and the compressed movable spring 29 extends, causing the movable rod 22 to insert into the fixed slide rail 10. Simultaneously, without the limitation of the outer support plate 2, the counterweight 11 presses one end of the first connecting rod 8 downwards until it reaches the movable rod 22. At this point, the first connecting rod 8 and the second connecting rod 9 can support the second inner plate 21. As the counterweight 11 moves downwards, it can press the ends of the first connecting rod 8 and the second connecting rod 9 on the ground onto the ground, thus... The device provides stable support for the second inner plate 21 and the inner support plate 5. The movable rod 22 limits the sliding distance of one end of the first connecting rod 8, allowing the device to provide support even on terrains similar to field ridges, thus increasing its applicability. This method effectively reduces the economic pressure of normal template turnover. At the same time, the prefabricated method eliminates the need for temporary construction by workers to support the wall 1, reducing assembly time and increasing efficiency. By reducing assembly time, the problem between the time required for wall 1 to be cured with the formwork and the turnover of the template is balanced. Multiple methods are used simultaneously to meet the needs of wall 1 for curing with the formwork and the high frequency of template turnover required in the project.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-removable formwork curing device for concrete walls, characterized in that: The system includes a wall (1) and an outer support plate (2) and an inner support plate (5) set on one side of the wall (1). A support frame (3) is fixedly provided on the outer wall of the outer support plate (2). Through holes (4) are also provided at the upper and lower ends of the outer support plate (2). Multiple snap-fit ​​telescopic rods (18) are evenly fixedly provided on the inner wall of the outer support plate (2). A fixed support plate (19) is fixedly provided on one side of the inner support plate (5). The fixed support plate (19) and the wall (1) are tightly fitted together. A first inner plate (20) and a second inner plate (21) are also slidably provided in the inner support plate (5) through a sliding assembly. Multiple grooves (25) are provided on the side walls of the fixed support plate (19) and the first inner plate (20). A spreading spring (26) is fixedly provided in each of the grooves (25). The fixed support plate (19) and the first inner plate (20) are... The second inner plate (21) and the first inner plate (20) are fixedly connected to each other by a spring (26). The upper and lower ends of the fixed support plate (19), the first inner plate (20) and the second inner plate (21) are provided with screw holes (23). Screws (24) are threaded in the screw holes (23). Fixed slide rails (10) are evenly fixed on the side wall of the second inner plate (21) away from the wall (1). The lower end of the fixed slide rail (10) is provided with a second connecting rod (9). The end of the second connecting rod (9) away from the fixed slide rail (10) is provided with a first connecting rod (8). The other end of the first connecting rod (8) is movably connected in the fixed slide rail (10). An automatic positioning support structure is also provided between the end of the first connecting rod (8) and the fixed slide rail (10). The automatic positioning support structure includes an elastic snap-fit ​​component and a trigger component. The elastic snap-fit ​​assembly includes fixed blocks (12) fixedly arranged at intervals on both sides of the fixed slide rail (10). The fixed blocks (12) are provided with a movable groove (13) on one side wall near the fixed slide rail (10). A movable plate (28) is slidably arranged in the movable groove (13). A movable spring (29) is fixed between the movable plate (28) and the bottom wall of the movable groove (13). A movable rod (22) is fixed on the other side wall of the movable plate (28). Snap-fit ​​holes matching the movable rod (22) are provided on both sides of the fixed slide rail (10). The triggering component includes a sliding cavity (14) disposed on the outer walls of both sides of the fixed slide rail (10). A sliding plate (15) is slidably disposed in the sliding cavity (14). A stop block (16) is fixedly disposed on the side wall of the sliding plate (15). A tension spring (17) is fixedly disposed between the sliding plate (15) and the lower side wall of the sliding cavity (14). The stop block (16) is disposed in correspondence with the snap-fit ​​hole, and the stop block (16) and the snap-fit ​​telescopic rod (18) correspond to each other.

2. The non-removable formwork curing device for concrete walls according to claim 1, characterized in that: The sliding assembly includes a slider (27) fixedly disposed on the side wall of the first inner plate (20) and the second inner plate (21). The side wall of the inner support plate (5) is provided with a matching groove (6). The slider (27) is slidably disposed in the groove (6). The slider (27) and the groove (6) are matched in a T-shape.

3. The non-removable formwork curing device for concrete walls according to claim 1, characterized in that: The inner support plate (5) is fixed with limiting plates (7) at the four corners of the side away from the wall (1), and the limiting plates (7) are set in correspondence with the second inner plate (21).

4. The non-removable formwork curing device for concrete walls according to claim 1, characterized in that: The inner support plate (5) and the fixed support plate (19) are integrally formed.

5. A non-removable formwork curing device for concrete walls according to claim 1, characterized in that: A counterweight bar (11) is also slidably provided inside the upper end of the fixed slide rail (10), and the counterweight bar (11) is located at the upper end of the end of the first connecting rod (8).

6. A non-removable formwork curing device for concrete walls according to claim 1, characterized in that: The outer diameter of the inner support plate (5) is equal to the inner diameter of the outer support plate (2), and the inner support plate (5) and the outer support plate (2) are fixedly connected by nails.

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