A hollow concrete structure construction pre-burying foam column reinforcing fixing device

Abstract

The present application relates to the technical field of concrete insulation board, and discloses a hollow concrete structure construction pre-buried foam column reinforcing and fixing device, which comprises a cover plate, a pair of vertical pipes are arranged on the cover plate, the vertical pipes are PVC-U pipes, the outer diameter of the vertical pipes is less than 0.5 cm, a wire is arranged in each of the vertical pipes, the wire is a flexible polytetrafluoroethylene wire, the bottom ends of the two wires are fixedly connected, a rotating rod is rotatably installed on the cover plate, the top ends of the wires are wound on the rotating rod, the wire is pressed on the foam column before pouring the concrete insulation board, the bottom end of the vertical pipe is provided with an elbow pipe, the wire passes through the elbow pipe, and the opening of the elbow pipe faces the foam column. The wire is pressed on the middle part of the foam column, the middle part of the foam column can be effectively constrained, the whole fixing device can be completely taken out, no part will be left in the concrete, no new heat bridge or foreign matter will be formed, and the overall performance of the insulation board is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of concrete insulation board technology, specifically to a device for reinforcing and fixing pre-embedded foam columns during the construction of hollow concrete structures. Background Technology

[0002] With the advancement of my country's "dual carbon" goals, building energy conservation has become an important means of reducing carbon emissions. According to the requirements of the "Standard for Thermal Design of Civil Buildings" GB50176-2016 and the "Technical Standard for External Wall Insulation Engineering" JGJ144-2019, the heat transfer coefficient of the external walls of civil buildings needs to be controlled within 0.4-0.6 W / (m²・K) to meet the energy conservation requirements of severely cold and cold regions. Hollow concrete insulation boards, as a new type of composite insulation board, achieve thermal insulation of the wall by pre-embedding foam column core molds inside the concrete and utilizing the low thermal conductivity of the foam columns, while retaining the structural strength of the concrete board. It has the dual functions of load-bearing and thermal insulation, and therefore has been widely used in external wall insulation projects in recent years.

[0003] For example, Chinese patent application CN217759489U discloses a device for reinforcing and fixing pre-embedded foam columns in the construction of hollow concrete structures. The device includes a steel strip, on which several rectangular bamboo strips are evenly fixed. The bamboo strips are perpendicular to the steel strip. Both ends of the steel strip are fixed to the upper end of a fixing bracket. The bottom surface of the fixing bracket is provided with a threaded hole, and a nut is welded to the threaded hole. The nut is threadedly connected to a screw rod, and a long hook is welded to the bottom of the screw rod. The combination of bamboo strips and steel strip is used to fix the core mold around the pre-embedded foam column, which effectively avoids the uneven floating and breakage of the pre-embedded foam column during concrete pouring.

[0004] The existing combination of bamboo strips and steel strips is only convenient for simple fixation of the two ends of the foam column. When the concrete insulation board is poured, the middle position of the foam column is prone to local displacement and floating under the influence of flowing concrete, resulting in excessive concrete pouring in some parts of the board and producing a "thermal bridge" phenomenon, which affects the performance of the concrete insulation board. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-embedded foam column reinforcement and fixing device for the construction of hollow concrete structures, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this solution provides a pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction, including a cover plate. A pair of vertical pipes are provided on the cover plate. The vertical pipes are made of PVC-U pipes with an outer diameter of less than 0.5 cm. Wires are respectively installed inside the pair of vertical pipes. The wires are made of flexible polytetrafluoroethylene wires. The bottom ends of the pair of wires are fixedly connected to each other. A rotating rod is rotatably installed on the cover plate. The top ends of the wires are wound around the rotating rod. Before the concrete insulation board is poured, the wires are pressed onto the foam column.

[0007] Optionally, the bottom end of the vertical pipe is provided with an elbow pipe, through which the wire passes, and the opening of the elbow pipe faces the foam column.

[0008] Optionally, a plug is provided at the opening of the elbow pipe. The plug is a rubber block with a through hole. The wire passes through the through hole, and the diameter of the through hole in its natural state is smaller than the diameter of the wire.

[0009] Optionally, the cover plate has a through groove, in which a slider is slidably installed. The vertical tube is threadedly connected to the slider. When the diameter of the foam column is small, the distance between a pair of vertical tubes can be changed by sliding the slider.

[0010] Optionally, the slider is configured as an I-shaped slider, with bolts installed on the slider's wing plates, and a friction plate provided at the bottom of the slider's wing plates. The friction plate is a metal plate, and the bottom end of the bolt abuts against the friction plate. After the bolt is tightened, the slider is locked.

[0011] Optionally, the cover plate is provided with a support, the rotating rod is rotatably mounted on the support via a bearing, and a pair of spools are provided on the rotating rod, with the pair of wires respectively wound on the pair of spools.

[0012] Optionally, a handwheel is provided at the end of the rotating rod, and the winding direction of the wires on the pair of spools is the same. After the rotating rod is rotated, the pair of wires are tightened or released synchronously.

[0013] Optionally, a rotating ring is rotatably mounted on the support, the rotating ring is connected to the handwheel, the rotating ring is sleeved on the rotating rod, a torsion spring is sleeved on the outer wall of the rotating rod, one end of the torsion spring is connected to the rotating rod, and the other end of the torsion spring is connected to the rotating ring.

[0014] Optionally, the inner wall of the rotating rod is provided with a mounting groove, a pressing block is hinged in the mounting groove, and a spring plate is provided in the mounting groove, the spring plate abutting against the pressing block; The support is provided with a fixed shaft, and a protrusion is installed on the fixed shaft. The pressing block is provided with a bevel and a flat side. After the protrusion abuts against the bevel, the pressing block is embedded in the mounting groove. After the protrusion abuts against the flat side, the rotating rod no longer rotates.

[0015] Optionally, a movable rod is slidably inserted inside the rotating rod, the end of the pressing block is hinged to the movable rod, a compression spring is installed inside the rotating rod, and the other end of the compression spring is connected to the movable rod.

[0016] The technical effects and advantages of the present invention are as follows: 1. The wire is pressed into the middle of the foam column, which can effectively restrain the middle of the foam column and limit the deformation of the middle of the foam column under the action of concrete lateral pressure. This prevents the middle of the foam column from shifting, which solves the problem of easy displacement of the middle of the foam column in the existing technology. It effectively avoids the generation of thermal bridges. At the same time, the entire fixing device can be completely removed without any parts remaining in the concrete. It will not form new thermal bridges or foreign objects, ensuring the overall performance of the insulation board.

[0017] 2. After the protrusion and the flat edge lose contact, the rotating rod rotates rapidly under the action of the torsion spring, and the wire wheel quickly winds up the wire, thereby quickly straightening the wire and shaking off the residual concrete mortar on the wire, making it easier to recycle the wire. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 Appendix to this invention Figure 1 Enlarged structural diagram at point A; Figure 3 This is a schematic diagram of the block structure of the present invention; Figure 4 This is a schematic diagram of the structure for fixing foam columns with wires according to the present invention; Figure 5 This is a schematic diagram of the slider of the present invention; Figure 6 This is a cross-sectional structural diagram of the support of the present invention; Figure 7 Appendix to this invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the spring sheet of the present invention under pressure; Figure 9 This is a schematic diagram of the compression spring of the present invention under compression.

[0019] Explanation of reference numerals in the attached drawings: 101, cover plate; 102, through groove; 103, slider; 104, bolt; 105, friction plate; 201, vertical pipe; 202, elbow pipe; 203, wire; 204, plug; 205, through hole; 301, support; 302, rotating rod; 303, handwheel; 304, reel; 305, swivel; 306, torsion spring; 307, fixed shaft; 308, mounting groove; 309, spring plate; 310, pressing block; 311, protrusion; 312, moving rod; 313, compression spring. Detailed Implementation

[0020] To make the aforementioned objectives, features, and advantages of this solution more apparent and understandable, the specific embodiments of this solution are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this solution. However, this solution can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this solution. Therefore, this solution is not limited to the specific embodiments disclosed below.

[0021] Based on some embodiments of this solution, a pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction is provided, for reference. Figures 1 to 9 As shown, the pre-embedded foam column reinforcement and fixing device in the construction of the hollow concrete structure includes a cover plate 101. A pair of vertical pipes 201 are provided on the cover plate 101. The vertical pipes 201 are made of PVC-U pipe (rigid polyvinyl chloride pipe) to reduce the overall weight of the device. The outer diameter of the vertical pipes 201 is less than 0.5cm. A wire 203 is provided inside the pair of vertical pipes 201. The wires 203 are made of flexible polytetrafluoroethylene wire. The bottom ends of the pair of wires 203 are fixedly connected to each other. A rotating rod 302 is rotatably installed on the cover plate 101. The top end of the wire 203 is wound around the rotating rod 302. Before the concrete insulation board is poured, the wire 203 is pressed on the foam column.

[0022] Among them, PVC-U pipe is lightweight, high-strength, alkali-resistant, and corrosion-resistant, and can withstand the lateral pressure during concrete pouring. At the same time, its smooth surface will not stick to the concrete when pulled out, making it easy to remove. Polytetrafluoroethylene wire has an extremely low coefficient of friction and excellent alkali resistance and waterproof performance. It can remain stable in alkaline concrete environment and will not be corroded. Its smooth surface makes it easy to pull out quickly after pouring without leaving any residue. The outer diameter of the vertical pipe 201 is set to be less than 0.5cm to ensure that the diameter of the hole left after the vertical pipe 201 is removed is extremely small, only about 0.5cm, which will not affect the overall structural strength of the concrete, nor will it form a new thermal bridge. Because after the tiny hole is sealed, its thermal properties are basically the same as the surrounding concrete, and no obvious heat flow channel will be generated.

[0023] Thus, before pouring the concrete insulation board, after installing the reinforcing cage and foam columns in the mold, the cover plate 101 is placed on top of the mold frame. At this time, the wire 203 presses on the foam columns to fix them and prevent them from shifting or floating. After pouring, the cover plate 101 is slowly removed, and the vertical pipe 201 and wire 203 are removed from the concrete. In this device, the vertical pipe 201 and wire 203 have a small cross-sectional area and volume, so after the vertical pipe 201 and wire 203 are removed, the density of the concrete will not decrease due to voids.

[0024] Unlike traditional end-fixing methods, the wire 203 of this device is pressed into the middle of the foam column, which can effectively constrain the middle of the foam column and limit the deformation of the middle of the foam column under the action of concrete lateral pressure. This prevents the middle of the foam column from shifting, solving the problem of easy shifting of the middle of the foam column in the prior art. It effectively avoids the generation of thermal bridges. At the same time, the entire fixing device can be completely removed without any parts remaining inside the concrete, thus preventing the formation of new thermal bridges or foreign objects and ensuring the overall performance of the insulation board.

[0025] Specifically, the bottom end of the vertical pipe 201 is provided with an elbow pipe 202, through which the wire 203 passes, and the opening of the elbow pipe 202 faces the foam column.

[0026] Additionally, please refer to Figure 2 , Figure 3 A block 204 is provided at the opening of the elbow pipe 202. The block 204 is a rubber block and a through hole 205 is provided on the block 204. The wire 203 passes through the through hole 205, and the diameter of the through hole 205 in its natural state is smaller than the diameter of the wire 203.

[0027] It should be noted that in this embodiment, the blocking block 204 is designed to prevent concrete mortar from entering the interior of the vertical pipe 201 during concrete pouring, which could cause the wire 203 to be stuck and unable to be removed smoothly. Since the natural diameter of the through hole 205 is smaller than the diameter of the wire 203, the blocking block 204 will fit tightly against the wire 203 to form a seal, preventing concrete mortar from entering the interior of the vertical pipe 201. At the same time, when the wire 203 is lifted upward, the wall of the through hole 205 of the blocking block 204 will scrape off the concrete mortar adhering to the surface of the wire 203, ensuring the cleanliness of the wire 203 and facilitating the reuse of the device. It also avoids the problem of mortar entering the interior of the vertical pipe 201, which could prevent the vertical pipe 201 from being pulled out.

[0028] The cover plate 101 has a through groove 102, and a slider 103 is slidably installed in the through groove 102. The vertical tube 201 is threadedly connected to the slider 103. When the diameter of the foam column is small, the slider 103 is slid to change the spacing of the vertical tubes 201. When the insulation board thickness is low, the vertical tube 201 is rotated by a screw to move the vertical tube 201 upward, thereby increasing the applicability of the device.

[0029] For details, please refer to Figure 5 The slider 103 is configured as an I-shaped slider. Bolts 104 are installed on the wing plate of the slider 103. Friction plate 105 is provided at the bottom of the wing plate of the slider 103. The friction plate 105 is a metal plate. The bottom end of the bolt 104 abuts against the friction plate 105. After the bolt 104 is tightened, the slider 103 is locked.

[0030] In addition, a support 301 is provided on the cover plate 101, and a rotating rod 302 is rotatably mounted on the support 301 via a bearing. A pair of thread wheels 304 are provided on the rotating rod 302, and a pair of wires 203 are wound on the pair of thread wheels 304 respectively. A handwheel 303 is provided at the end of the rotating rod 302, and the winding direction of the wires 203 on the pair of thread wheels 304 is the same. After the rotating rod 302 rotates, the pair of wires 203 are tightened or released synchronously.

[0031] Through the above technical solution, the pre-embedded foam column reinforcement and fixing device provided in this solution for the construction of hollow concrete structure is used in which the wire 203 presses on the foam column to fix the foam column and prevent the foam column from shifting or floating. After the pouring is completed, the vertical pipe 201 and the wire 203 have a small cross-sectional area and volume. Therefore, after the vertical pipe 201 and the wire 203 are removed, the density of the concrete will not decrease due to the voids. Unlike traditional end-fixing methods, the wire 203 of this device is pressed into the middle of the foam column, effectively constraining the middle of the foam column and limiting its deformation under the lateral pressure of concrete. This prevents the middle of the foam column from shifting, solving the problem of easy shifting of the middle of the foam column in existing technologies and effectively avoiding the generation of thermal bridges. At the same time, the entire fixing device can be completely removed without any parts remaining inside the concrete, thus preventing the formation of new thermal bridges or foreign objects and ensuring the overall performance of the insulation board. This solves the problem mentioned in the background technology that the combination of bamboo strips and steel strips in existing devices only facilitates simple fixation at both ends of the foam column. During the pouring of concrete insulation board, the middle position of the foam column is prone to local shifting and floating under the influence of flowing concrete, resulting in excessive local concrete pouring and the generation of "thermal bridges," which affects the performance of the concrete insulation board.

[0032] In some implementations of this solution, reference is made to Figure 6 , Figure 7As shown, a rotating ring 305 is rotatably mounted on the support 301. The rotating ring 305 is connected to the handwheel 303. The rotating ring 305 is sleeved on the rotating rod 302. A torsion spring 306 is sleeved on the outer wall of the rotating rod 302. One end of the torsion spring 306 is connected to the rotating rod 302, and the other end of the torsion spring 306 is connected to the rotating ring 305.

[0033] The inner wall of the rotating rod 302 is provided with a mounting groove 308. A pressing block 310 is hinged in the mounting groove 308. A spring plate 309 is provided in the mounting groove 308. The spring plate 309 abuts against the pressing block 310. A fixed shaft 307 is provided on the support 301. A protrusion 311 is installed on the fixed shaft 307. The pressing block 310 is provided with a bevel and a flat side. After the protrusion 311 abuts against the bevel, the pressing block 310 is embedded in the mounting groove 308. After the protrusion 311 abuts against the flat side, the rotating rod 302 no longer rotates.

[0034] A movable rod 312 is slidably inserted inside the rotating rod 302. The end of the pressing block 310 is hinged to the movable rod 312. A compression spring 313 is installed inside the rotating rod 302, and the other end of the compression spring 313 is connected to the movable rod 312.

[0035] For details, please refer to Figure 6 , Figure 7 After the pouring is completed, the handwheel 303 is turned to wind up the wire 203. The rotating ring 305 rotates counterclockwise, and the rotating ring 305 drives the rotating rod 302 to rotate through the torsion spring 306, thereby winding up the wire 203. As the rotating rod 302 rotates, the pressing block 310 inside the rotating rod 302 contacts the protrusion 311, and the rotating rod 302 stops rotating. The rotating ring 305 and the rotating rod 302 rotate relative to each other, and the torsion spring 306 twists and stores force. When the torsion spring 306 gradually twists to the maximum torque, the pressing block 310 moves with the moving rod 312 towards the compression spring 313, so that the protrusion 311 loses contact with the flat edge. The rotating rod 302 rotates rapidly under the action of the torsion spring 306, and the wire wheel 304 quickly winds up the wire 203, thereby quickly straightening the wire 203. The residual concrete mortar on the wire 203 is shaken off, making it easy to recycle the wire 203.

[0036] It should be noted that in this embodiment, wire 203 is used for continuous concrete insulation board pouring. When wire 203 ages and its performance deteriorates, simply pull wire 203 down out of vertical pipe 201, cut off the aged and deteriorated wire 203, and reconnect the ends of a pair of wires 203 by manually tying them together.

[0037] It should be noted that the process of using this device to manufacture concrete insulation boards is as follows: First, prepare concrete raw materials according to the designed mix proportions, including P.O42.5 grade ordinary Portland cement, well-graded medium sand, 5-10mm continuously graded crushed stone, grade I fly ash, and polycarboxylate-based high-efficiency water-reducing agent. At the same time, prefabricate foam columns using flame-retardant polystyrene particles by steam heating and molding, controlling the density of the foam columns to be 20-22 kg / m³. In addition, process the reinforcing cage using HRB400 grade steel bars, which are then tied together to form the reinforcing cage. Next, the processed steel cage is placed into the mold, and then the prefabricated foam column is placed into the mold according to the marked position to initially position the foam column, ensuring that the end of the foam column is aligned with the end of the mold, with a positional deviation of no more than 2mm. Then, the cover plate 101 in this embodiment is mounted on the upper edge of the mold. The position of the cover plate 101 is adjusted so that the center of the cover plate 101 is aligned with the center of the foam column. Then, according to the diameter of the foam column, the slider 103 is slid to adjust the distance between the two vertical tubes 201 so that the center distance between the two vertical tubes 201 is 10cm larger than the diameter of the foam column, ensuring that the wire 203 can be pressed in the middle of the foam column. After the adjustment is completed, the bolt 104 on the slider 103 is tightened to lock the position of the slider 103. Then, according to the thickness of the insulation board, the vertical tube 201 is rotated to adjust the height of the vertical tube 201 so that the bottom end of the vertical tube 201 just reaches the middle position of the foam column. The concrete is poured in layers. During the pouring process, direct impact of concrete on the foam column and fixing device is avoided to prevent the foam column and fixing device from shifting. After the pouring is completed, an immersion vibrator is used for compaction. The spacing between the vibration points is controlled within 30cm, the vibration time is controlled within 20-30s, and the vibration depth is controlled within 50mm above the bottom of the concrete layer until the concrete surface shows slurry and no longer sinks. After the concrete is poured, wait 1-1.5 hours, then pull out the vertical pipe 201 upwards and remove it from the concrete. Turn the handwheel 303 to drive the rotating ring 305 to rotate. The rotating ring 305 drives the rotating rod 302 to rotate through the torsion spring 306, thus winding up the wire 203. When the rotating rod 302 rotates to the locked position, continue to turn the handwheel 303. The torsion spring 306 begins to store force. When the torque of the torsion spring 306 reaches its maximum value, the rotating rod 302 unlocks and rotates rapidly under the action of the torsion spring 306, quickly winding up the wire 203 and pulling the wire 203 out of the concrete quickly, while shaking off the mortar on the surface of the wire 203.

[0038] The preferred embodiments of this solution have been described in detail above with reference to the accompanying drawings. However, this solution is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this solution, various simple modifications can be made to the technical solution, and these simple modifications all fall within the protection scope of this solution.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this solution will not describe the various possible combinations separately.

[0040] Furthermore, various implementations of this solution can be combined in any way, as long as they do not violate the spirit of this solution, they should also be regarded as the content disclosed in this solution.

Claims

1. A device for reinforcing and fixing pre-embedded foam columns during the construction of hollow concrete structures, comprising a cover plate (101), characterized in that: A pair of vertical pipes (201) are provided on the cover plate (101). The vertical pipes (201) are made of PVC-U pipes and the outer diameter of the vertical pipes (201) is less than 0.5cm. A wire (203) is provided inside the pair of vertical pipes (201). The wire (203) is made of flexible polytetrafluoroethylene wire. The bottom ends of the pair of wires (203) are fixedly connected to each other. A rotating rod (302) is rotatably installed on the cover plate (101). The top end of the wire (203) is wound around the rotating rod (302). Before the concrete insulation board is poured, the wire (203) is pressed on the foam column.

2. The pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 1, characterized in that: The bottom end of the vertical pipe (201) is provided with an elbow pipe (202), the wire (203) passes through the elbow pipe (202), and the opening of the elbow pipe (202) faces the foam column.

3. The pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 2, characterized in that: A plug (204) is provided at the opening of the elbow pipe (202). The plug (204) is a rubber block and a through hole (205) is provided on the plug (204). The wire (203) passes through the through hole (205) and the diameter of the through hole (205) in its natural state is smaller than the diameter of the wire (203).

4. The pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 1, characterized in that: The cover plate (101) has a through groove (102), and a slider (103) is slidably installed in the through groove (102). The vertical tube (201) is threadedly connected to the slider (103). When the diameter of the foam column is small, the distance between the pair of vertical tubes (201) can be changed by sliding the slider (103).

5. The pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 4, characterized in that: The slider (103) is configured as an I-shaped slider. Bolts (104) are installed on the wing plate of the slider (103). Friction plate (105) is provided at the bottom of the wing plate of the slider (103). The friction plate (105) is a metal plate. The bottom end of the bolt (104) abuts against the friction plate (105). After the bolt (104) is tightened, the slider (103) is locked.

6. The pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 1, characterized in that: A support (301) is provided on the cover plate (101), and the rotating rod (302) is rotatably mounted on the support (301) via a bearing. A pair of spools (304) are provided on the rotating rod (302), and a pair of wires (203) are respectively wound on the pair of spools (304).

7. A pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 6, characterized in that: The end of the rotating rod (302) is provided with a handwheel (303), and the winding direction of the wires (203) on the pair of spools (304) is the same. After the rotating rod (302) rotates, the pair of wires (203) are tightened or released synchronously.

8. A pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 7, characterized in that: A rotating ring (305) is rotatably mounted on the support (301). The rotating ring (305) is connected to the handwheel (303). The rotating ring (305) is sleeved on the rotating rod (302). A torsion spring (306) is sleeved on the outer wall of the rotating rod (302). One end of the torsion spring (306) is connected to the rotating rod (302), and the other end of the torsion spring (306) is connected to the rotating ring (305).

9. A pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 8, characterized in that: The inner wall of the rotating rod (302) is provided with an installation groove (308), a pressing block (310) is hinged in the installation groove (308), and a spring plate (309) is provided in the installation groove (308), the spring plate (309) abuts against the pressing block (310); The support (301) is provided with a fixed shaft (307), and a protrusion (311) is installed on the fixed shaft (307). The pressing block (310) is provided with a bevel and a flat edge. After the protrusion (311) abuts against the bevel, the pressing block (310) is embedded in the mounting groove (308). After the protrusion (311) abuts against the flat edge, the rotating rod (302) no longer rotates.

10. A pre-embedded foam column reinforcement and fixing device for hollow concrete structure construction according to claim 9, characterized in that: The rotating rod (302) has a sliding rod (312) inserted inside. The end of the pressing block (310) is hinged to the moving rod (312). A compression spring (313) is installed inside the rotating rod (302), and the other end of the compression spring (313) is connected to the moving rod (312).

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