Beam slab prefabricating mold for promoting discharge of bubbles in concrete by using vibration sense of reinforcing steel bar

Abstract

The invention discloses a beam-slab prefabricating mold for promoting discharge of bubbles in concrete by using vibration sense of reinforcing steel bars, which belongs to the technical field of beam-slab prefabricating molds and comprises a prefabricating platform, a prefabricating mold is fixed in the middle of the platform, and reinforcing steel bar tire mold frames with the same height are arranged around the platform. Positioning sleeves are arranged on the outer sides of the tire mold frames, and reinforcing steel bars penetrate into the molds and are distributed in a staggered mode. An inner cavity is formed in the tire mold frame, a plurality of linkage operation pipe sets (comprising a main pipe sleeve, a rotary pipe sleeve, a fracture and a transition taper pipe) coaxial with the positioning sleeve are arranged on the side wall of the tire mold frame, and steel bars synchronously penetrate into the linkage operation pipe sets. The inner cavity is further provided with a driving / driven device, a tensioning device and a switching device. And the chain winds around the rotating pipe sleeve and the driving / driven / tensioning device in a snakelike manner. After starting, the chain cuts to the fracture from the rotating pipe sleeve, knocks the steel bar, vibrates and transmits concrete, promotes the concrete around the steel bar to flow, discharges attached bubbles, improves the bonding force, reduces the cracking of the component, and improves the long-term stability of the beam slab.

Description

Technical Field

[0001] This invention relates to the field of precast beam and slab mold technology, specifically to a precast beam and slab mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles from concrete. Background Technology

[0002] Currently, the production of precast components such as bridge beams and slabs generally adopts the mold casting process, but existing precast mold technology generally has the following problems: Difficulty in escaping air bubbles: When steel bars are laid in multiple layers in a crisscross pattern within the precast mold, air bubbles tend to adhere to the surface of the steel bars during concrete pouring and cannot escape. This reduces the bonding area between the concrete and the steel bars, thereby decreasing the crack resistance and overall reliability of the component. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a precast beam and slab mold that uses the vibration of steel bars to promote the discharge of air bubbles in concrete. Based on the existing steel bar formwork frame, the structure is improved by using a chain to continuously tap the steel bars and transmit the vibration along the steel bars to the precast mold, which can actively discharge air bubbles attached to the surface of the steel bars in the concrete and improve the stability of the quality of the precast beam and slab components.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A precast beam and slab mold for reducing concrete air bubbles and dispersing steel reinforcement stress includes a precast platform, a horizontally set precast mold fixed in the middle of the precast platform, and steel reinforcement formwork frames of the same height as the precast mold fixed around the perimeter of the precast platform. The outer wall of the steel reinforcement formwork is fixed with multiple evenly distributed positioning sleeves that all extend toward the location of the precast mold. Each positioning sleeve contains steel bars that are inserted into the precast mold. All steel bars are eventually distributed in a crisscross pattern within the precast mold. The core improvements are as follows: an inner cavity is provided inside the steel reinforcement formwork frame on either the front or rear side of the precast platform, or on either the left or right side of the precast platform; multiple linkage operation pipe groups are fixed on the side wall of the inner cavity, with the same number and coaxial position as the positioning sleeves, and the steel bars passing through the positioning sleeves are simultaneously passed through the linkage operation pipe groups; an active device and a driven device that communicate with the inner cavity are fixed in the middle of the top and bottom walls of the steel reinforcement formwork frame, respectively; two sets of tensioning devices are also fixed on the side wall of the inner cavity, located at both ends of all linkage operation pipe groups; a switching device that can link the two sets of tensioning devices to slide back and forth along the axial direction of the linkage operation pipe groups is also installed inside the inner cavity; a chain that closes at both ends is circumferentially wound around all linkage operation pipe groups in a serpentine pattern, and the chain is also circumferentially wound around the active device, driven device, and tensioning device. The linkage operation pipe assembly includes a main pipe sleeve; a rotating pipe sleeve is rotatably installed on the pipe section of the main pipe sleeve near the positioning pipe sleeve, and a cut is opened on the pipe section of the main pipe sleeve away from the positioning pipe sleeve to expose the reinforcing steel bar; a transition tapered pipe with a gradually decreasing diameter towards the cut is connected between the rotating pipe sleeve and the cut. Initially, the chain is circumferentially wound around the rotating sleeve of the linkage operation tube assembly. After the active device and switching device are started, the chain itself will gradually move towards the break point of the linkage operation tube assembly while circulating and driving. When the position of the chain is completely switched from the location of the rotating sleeve to the location of the break point, the chain will continuously strike the steel bar and transmit the vibration along the steel bar to the concrete of the precast mold.

[0005] By adopting the above scheme, the precast mold of the beam and slab continuously strikes the steel bars with a chain and transmits the vibration along the steel bars to the precast mold. The vibration causes the concrete around the steel bars to flow slightly, forcibly expelling the air bubbles attached to the surface of the steel bars, improving the bond between the concrete and the steel bars, reducing the risk of component cracking, and greatly improving the long-term stability of the beam and slab structure.

[0006] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, the active device includes an active seat, an active shaft rotatably mounted inside the active seat, and an active sprocket that can slide along its axial direction is coaxially mounted on the active shaft via a limit key, wherein a chain is circumferentially wound around the active sprocket; the function of the active device is to provide the active force for the cyclic transmission of the chain.

[0007] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, the drive shaft extends from the inside of the drive seat to its outside. One end of the drive shaft located outside the drive seat is connected to a connector. The connector can be connected to a manual crank or a motor, and the drive method can be flexibly selected according to the actual situation. The advantage of choosing a manual crank is that it is simple and quick to install, but it is only suitable for driving less than 20 reinforcing bars at the same time. The advantage of choosing a motor is that it is labor-saving and has high torque, and it can drive more than 20 reinforcing bars at the same time, but its connection takes a long time and requires power supply.

[0008] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, the driven device includes a driven seat, a driven shaft fixedly installed inside the driven seat, and a driven sprocket rotatably mounted on the driven shaft that can slide along its axial direction, wherein a chain is circumferentially wound around the driven sprocket; the function of the driven device is to provide driven power for the cyclic transmission of the chain.

[0009] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, the tensioning device includes a linear slide rail that is inclined relative to the linkage operation pipe assembly. A slide block that slides back and forth along the length of the linear slide rail is installed on the linear slide rail. A tensioning sprocket that is parallel to the linkage operation pipe assembly is rotatably installed on the slide block, wherein the chain is circumferentially wound around the tensioning sprocket. The function of the tensioning device is to keep the chain in a tensioned state at all times.

[0010] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the discharge of air bubbles in concrete, the distance between the linear slide rail and the break point of the linkage operation pipe group is greater than the distance between the linear slide rail and the rotating sleeve in the linkage operation pipe group. The linear slide rail is inclined in the above manner, which ensures that the chain is always taut when switching from the rotating sleeve to the reinforcing bar.

[0011] As a preferred embodiment of the beam and slab precast mold that utilizes the vibration of steel bars to promote the expulsion of air bubbles in concrete, a total of three sets of tensioning sprockets are provided, and the three sets of tensioning sprockets are arranged side by side, with the chain circumferentially wrapped around the three sets of tensioning sprockets in a serpentine manner, which can further improve the tensioning effect of the chain.

[0012] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, the switching device includes multiple linear slide rods parallel to the linkage operation pipe group. A switching frame parallel to the length direction of the reinforcing bar formwork is simultaneously slidably installed on all linear slide rods. A screw extending out of the reinforcing bar formwork is connected in the middle of the switching frame. Telescopic rods that can extend and retract are inserted into both ends of the switching frame. A booster frame that is fixedly connected to the slide block is connected to the telescopic rod. The function of the switching device is to realize the reciprocating sliding of the chain along the axial direction of the linkage operation pipe group.

[0013] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of steel bars to promote the expulsion of air bubbles in concrete, two rows of vertically arranged stop bars are fixed at the edge of the switching frame. The distance between the two rows of stop bars is exactly equal to the width of the chain, and the chain is always located between the two rows of stop bars, further ensuring that the chain slides smoothly with the switching frame.

[0014] As a preferred embodiment of a beam and slab precast mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, a screw rod is installed through a nut fixed to the outside of the reinforcing bar formwork frame. One end of the screw rod located outside the reinforcing bar formwork frame is connected to a second connector. The second connector can be connected to a manual crank or a motor, and the driving method can be flexibly selected according to the actual situation. The advantage of choosing a manual crank is that it is simple and quick to install, but it is only suitable for driving less than 20 reinforcing bars at the same time. The advantage of choosing a motor is that it is labor-saving and has high torque, and it can drive more than 20 reinforcing bars at the same time, but its connection takes a long time and requires power supply.

[0015] The beneficial effects of this invention are: 1. Efficiently removes air bubbles: The precast beam mold continuously taps the reinforcing bars with a chain and transmits the vibration along the reinforcing bars to the concrete in the precast mold. The vibration causes the concrete around the reinforcing bars to flow slightly, forcibly removing air bubbles attached to the surface of the reinforcing bars, improving the bond between the concrete and the reinforcing bars, reducing the risk of component cracking, and greatly improving the long-term stability of the beam structure. 2. Integrated design: The exhaust and stress dispersion functions share a single chain drive system, resulting in a compact structure and convenient operation; 3. Flexible choice of drive method: The transmission of the entire chain can be controlled by a motor or manually, which makes it more flexible in application; the advantage of choosing a manual crank is that the installation is simple and quick, but it is only suitable for driving less than 20 steel bars at the same time; the advantage of choosing a motor is that it saves effort and has high torque, and can drive more than 20 steel bars at the same time, but the connection takes a long time and requires power supply. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural diagram of a precast beam and slab mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles from the concrete. Figure 2 This is a three-dimensional structural diagram of the steel reinforcement formwork frame; Figure 3 This is the main structural view of the steel reinforcement formwork. Figure 4 This is a top view of the steel reinforcement formwork structure. Figure 5 This is the internal main view of the steel reinforcement formwork when the chain is in a non-working state (located at the rotating sleeve). Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is a top view of the internal structure of the steel reinforcement formwork when the chain is in a non-working state (located at the rotating sleeve). Figure 8 for Figure 6 A magnified view of a section at point B in the middle; Figure 9 for Figure 6 A magnified view of a section at point C; Figure 10 This is the internal main view of the steel reinforcement formwork when the chain is in operation (located at the break point); Figure 11 for Figure 10 A magnified view of a section at point D; Figure 12 This is a top view of the internal structure of the steel reinforcement formwork when the chain is in operation (located at the break point); Figure 13 for Figure 12 A magnified view of a section at point E in the middle; Figure 14 for Figure 12 A magnified view of a section at point F.

[0018] The markings in the diagram are: 1-Precast platform; 2-Precast mold; 3-Rebar formwork frame; 4-Positioning sleeve; 5-Rebar; 6-Inner chamber; 7-Main pipe sleeve; 8-Rotating pipe sleeve; 9-Transition tapered pipe; 10-Drive seat; 11-Drive shaft; 12-Drive sprocket; 13-Connecting joint one; 14-Driven seat; 15-Driven shaft; 16-Driven sprocket; 17-Linear slide rail; 18-Slide seat; 19-Tensioning sprocket; 20-Linear slide bar; 21-Switching frame; 22-Screw; 23-Telescopic rod; 24-Pushing frame; 25-Stop bar; 26-Nut; 27-Connecting joint two; 28-Chain. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 2 As shown, a precast beam and slab mold is provided to reduce concrete air bubbles and disperse steel reinforcement stress. It is used for the production of precast components such as cap beams and box beams. Specifically, it includes a precast platform 1, a horizontally set precast mold 2 fixed in the middle of the precast platform 1, and steel reinforcement formwork frames 3 with the same height as the precast mold 2 fixed around the precast platform 1.

[0021] like Figures 1 to 2 As shown, the outer wall of the steel reinforcement formwork 3 is fixed with multiple evenly distributed positioning sleeves 4 that all extend toward the location of the precast mold 2. Each positioning sleeve 4 has a steel bar 5 inserted into the precast mold 2. All steel bars 5 are eventually distributed in a crisscross pattern within the precast mold 2.

[0022] like Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 12As shown, an inner chamber 6 is provided inside the steel reinforcement formwork 3 in front of the precast platform 1 and on the right side of the precast platform 1; multiple linkage operation pipe groups are fixed on the side wall of the inner chamber 6, which are equal in number and coaxial in position to the positioning sleeves 4, and the steel bars 5 passing through the positioning sleeves 4 are simultaneously passed into the linkage operation pipe groups; an active device and a driven device that communicate with the inner chamber 6 are fixed in the middle of the top wall and the middle of the bottom wall of the steel reinforcement formwork 3, respectively; two sets of tensioning devices located at both ends of all linkage operation pipe groups are also fixed on the side wall of the inner chamber 6; a switching device that can link the two sets of tensioning devices to slide back and forth along the axial direction of the linkage operation pipe groups is also installed inside the inner chamber 6; a chain 28 with closed ends is circumferentially wound around all linkage operation pipe groups in a serpentine manner, and the chain 28 is also circumferentially wound around the active device, the driven device and the tensioning device.

[0023] like Figure 8 , Figure 13 As shown, the linkage operation pipe assembly includes a main pipe sleeve 7; a rotating pipe sleeve 8 is rotatably installed on the pipe section of the main pipe sleeve 7 near the positioning pipe sleeve, and a cut is opened on the pipe section of the main pipe sleeve 7 away from the positioning pipe sleeve to expose the reinforcing bar 5; a transition tapered pipe 9 with a gradually decreasing diameter toward the cut is connected between the rotating pipe sleeve 8 and the cut. like Figures 5 to 14 As shown, the chain 28 is initially circumferentially wound around the rotating sleeve 8 of the linkage operation pipe assembly. After the active device and the switching device are started, the chain 28 will gradually move towards the break point of the linkage operation pipe assembly while it is circulating. When the position of the chain 28 is completely switched from the location of the rotating sleeve 8 to the location of the break point, the chain 28 will continuously strike the steel bar 5 and transmit the vibration along the steel bar 5 to the concrete in the precast mold 2.

[0024] like Figures 3 to 5 , Figure 10 As shown, the active device includes an active seat 10, an active shaft 11 is rotatably mounted inside the active seat 10, and an active sprocket 12 that can slide along its axial direction is coaxially mounted on the active shaft 11 via a limit key, wherein the chain 28 is circumferentially wound on the active sprocket 12; the function of the active device is to provide active force for the cyclic transmission of the chain 28.

[0025] like Figure 4 As shown, the drive shaft 11 extends from the inside of the drive seat 10 to its outside. One end of the drive shaft 11 located on the outside of the drive seat 10 is connected to a connector 13. The connector 13 can be connected to a manual crank or a motor. The drive method can be flexibly selected according to the actual situation. The advantage of choosing a manual crank is that it is simple and quick to install, but it is only suitable for driving less than 20 steel bars 5 at the same time. The advantage of choosing a motor is that it is labor-saving and has high torque, and it can drive more than 20 steel bars 5 at the same time, but it takes a long time to connect and requires power supply.

[0026] like Figures 3 to 5 , Figure 10 As shown, the driven device includes a driven seat 14, a driven shaft 15 is fixedly installed inside the driven seat 14, and a driven sprocket 16 that can slide along its axial direction is rotatably installed on the driven shaft 15, wherein the chain 28 is circumferentially wound on the driven sprocket 16; the function of the driven device is to provide driven power for the cyclic transmission of the chain 28.

[0027] like Figure 6 ,like Figure 9 ,like Figure 11 , Figure 14 As shown, the tensioning device includes a linear slide rail 17 that is inclined relative to the linkage operation tube assembly. A slide block 18 that slides back and forth along its length is installed on the linear slide rail 17. A tensioning sprocket 19 that is parallel to the linkage operation tube assembly is rotatably installed on the slide block 18. The chain 28 is circumferentially wound around the tensioning sprocket 19. The function of the tensioning device is to keep the chain 28 in a tensioned state at all times.

[0028] like Figure 9 , Figure 14 As shown, the distance between the linear slide rail 17 and the break point of the linkage operation pipe group is greater than the distance between it and the rotating pipe sleeve 8 in the linkage operation pipe group. The linear slide rail 17 is tilted in the above manner. When the chain 28 is switched from the rotating pipe sleeve 8 to the steel bar 5, it can be ensured that the chain 28 is always taut.

[0029] like Figure 6 ,like Figure 11 As shown, there are three sets of tension sprockets 19, which are arranged side by side. The chain 28 is serpentinely wrapped around the three sets of tension sprockets 19, which can further improve the tensioning effect of the chain 28.

[0030] like Figure 6 ,like Figure 8 ,like Figure 11 , Figure 13 As shown, the switching device includes multiple linear slide rods 20 parallel to the linkage operation tube group. All linear slide rods 20 are simultaneously slidably mounted with switching frames 21 parallel to the length direction of the steel reinforcement membrane frame 3. A screw rod 22 extending to the outside of the steel reinforcement membrane frame 3 is connected in the middle of the switching frame 21. Telescopic rods 23 that can extend and retract are inserted into both ends of the switching frame 21. A booster frame 24 that is fixedly connected to the slide block 18 is connected to the telescopic rod 23. The function of the switching device is to realize the reciprocating sliding of the chain 28 along the axial direction of the linkage operation tube group.

[0031] like Figure 8 , Figure 13As shown, two rows of vertically arranged baffles 25 are fixed at the edge of the frame of the switching frame 21. The distance between the two rows of baffles 25 is exactly equal to the width of the chain 28. The chain 28 is always located between the two rows of baffles 25, which further ensures that the chain 28 slides smoothly with the switching frame 21.

[0032] like Figure 4 As shown, the screw 22 is installed inside the nut 26 fixed on the outside of the steel bar formwork frame 3. One end of the screw 22 on the outside of the steel bar formwork frame 3 is connected to a connector 27. The connector 27 can be connected to a manual crank or a motor. The driving method can be flexibly selected according to the actual situation. The advantage of choosing a manual crank is that the installation is simple and quick, but it is only suitable for driving less than 20 steel bars 5 at the same time. The advantage of choosing a motor is that it saves effort and has a large torque, and can drive more than 20 steel bars 5 at the same time, but its connection takes a long time and requires power.

[0033] Working principle of the invention: When pouring concrete, start the active device connector 13 (use a manual crank to drive less than 20 steel bars 5; use a motor to drive more than 20 steel bars 5). The active shaft 11 rotates, driving the active sprocket 12 to rotate. At this time, the chain 28 is driven along the rotating sleeve 8 of the linkage operation pipe group. The rotating sleeve 8 can effectively reduce the transmission resistance of the chain 28. Simultaneously, the switching device's connector 27 is activated (a manual crank is used to drive fewer than 20 reinforcing bars 5; a motor is used to drive more than 20 reinforcing bars 5). The screw 22 rotates, causing the switching frame 21 to slide along the linear slide bar 20 towards the break point. The booster frame 24 pushes the slide block 18 to move along the linear slide rail 17. The tension sprocket 19 pulls the chain 28 to switch from the rotating sleeve 8 to the break point. Figure 10 , Figure 12 As shown; During transmission, chain 28 continuously strikes the reinforcing bar 5, transmitting the vibration along the reinforcing bar 5 to the concrete within the precast mold 2. This vibration causes slight flow in the concrete surrounding the reinforcing bar 5, forcibly expelling air bubbles adhering to its surface, improving the bond between the concrete and the reinforcing bar 5, reducing the risk of component cracking, and significantly enhancing the long-term stability of the beam-slab structure. This stage continues until the concrete pouring is complete (approximately 30-60 minutes). After the concrete pouring is finished, chain 28 is switched from the break point to the rotating sleeve 8. Figure 5 , Figure 7 As shown, the beam and slab components can be fabricated once the concrete has fully hardened (approximately 24-48 hours).

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast beam and slab mold that utilizes the vibration of reinforcing bars to promote the expulsion of air bubbles in concrete, comprising a precast platform, wherein a horizontally arranged precast mold is fixed in the middle of the precast platform, and reinforcing bar formwork frames of the same height as the precast mold are fixed around the perimeter of the precast platform. The outer wall of the steel reinforcement formwork is fixed with multiple evenly distributed positioning sleeves that all extend toward the location of the precast mold. Each positioning sleeve contains steel bars that are inserted into the precast mold. All steel bars are eventually distributed in a crisscross pattern within the precast mold. Its features are: An inner cavity is formed inside the steel reinforcement formwork frame on either the front or rear side of the precast platform, or on either the left or right side of the precast platform. Multiple linkage operation pipe groups, equal in number and coaxial in position to the positioning sleeves, are fixed to the side walls of the inner cavity. Steel bars passing through the positioning sleeves are simultaneously guided into the linkage operation pipe groups. An active device and a driven device, communicating with the inner cavity, are fixed in the middle of the top and bottom walls of the steel reinforcement formwork frame, respectively. Two sets of tensioning devices, located at both ends of all linkage operation pipe groups, are also fixed to the side walls of the inner cavity. A switching device capable of reciprocating along the axial direction of the linkage operation pipe groups is also installed inside the inner cavity. A chain with closed ends is sequentially wound in a serpentine circumferential pattern around all linkage operation pipe groups, and the chain is also simultaneously wound circumferentially around the active device, driven device, and tensioning device. The linkage operation pipe assembly includes a main pipe sleeve; a rotating pipe sleeve is rotatably installed on the pipe section of the main pipe sleeve near the positioning pipe sleeve, and a break is opened on the pipe section of the main pipe sleeve away from the positioning pipe sleeve to expose the reinforcing bar; a transition tapered pipe with a gradually decreasing diameter towards the break is connected between the rotating pipe sleeve and the break. Initially, the chain is circumferentially wound around the rotating sleeve of the linkage operation pipe assembly. After the active device and switching device are started, the chain itself will gradually move towards the break point of the linkage operation pipe assembly while circulating and driving. When the position of the chain is completely switched from the location of the rotating sleeve to the location of the break point, the chain will continuously strike the steel bar and transmit the vibration along the steel bar to the concrete in the precast mold.

2. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 1, characterized in that, The active device includes an active seat, on which an active shaft is rotatably mounted. An active sprocket, capable of sliding along its axial direction, is coaxially mounted on the active shaft via a limiting key, wherein a chain is circumferentially wound around the active sprocket.

3. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 2, characterized in that, The drive shaft extends from the inside of the drive seat to its outside. One end of the drive shaft located outside the drive seat is connected to a connector, which can be connected to a manual crank or a motor.

4. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 1, characterized in that, The driven device includes a driven seat, a driven shaft is fixedly installed inside the driven seat, and a driven sprocket that can slide along its axial direction is rotatably installed on the driven shaft, wherein a chain is circumferentially wound on the driven sprocket.

5. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 1, characterized in that, The tensioning device includes a linear slide rail that is inclined relative to the linkage operation tube assembly. A slide block that reciprocates along the length of the linear slide rail is mounted on the linear slide rail. A tensioning sprocket that is parallel to the linkage operation tube assembly is rotatably mounted on the slide block, wherein a chain is circumferentially wound around the tensioning sprocket.

6. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 5, characterized in that, The distance between the linear slide rail and the interruption port of the linkage operation tube group is greater than the distance between the linear slide rail and the rotating sleeve in the linkage operation tube group.

7. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 5, characterized in that, There are three sets of tension sprockets, arranged side by side, with the chain circumferentially wound around them in a serpentine manner.

8. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 5, characterized in that, The switching device includes multiple linear slide rods parallel to the linkage operation pipe group. A switching frame parallel to the length direction of the steel reinforcement membrane frame is simultaneously slidably installed on all linear slide rods. A screw rod extending out of the steel reinforcement membrane frame is connected in the middle of the switching frame. Telescopic rods that can extend and retract are inserted into both ends of the switching frame. A booster frame that is fixedly connected to the slide block is connected to the telescopic rod.

9. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 8, characterized in that, The switching frame has two rows of vertically arranged stop bars fixed at its edge. The distance between the two rows of stop bars is exactly equal to the width of the chain, and the chain is always located between the two rows of stop bars.

10. The precast beam and slab mold for promoting the expulsion of air bubbles in concrete using the vibration of reinforcing bars as described in claim 8, characterized in that, The screw is fitted through a nut fixed to the outside of the steel reinforcement formwork frame. One end of the screw located outside the steel reinforcement formwork frame is connected to a second connector, which can be connected to a manual crank or a motor.

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