A construction reinforcing steel positioning device

Abstract

The application discloses a building construction reinforcing steel bar positioning device, and relates to the technical field of building construction, which comprises a base, two fixed columns are fixedly installed on the top of the base, fixed arms are fixedly installed on the side of the two fixed columns, moving columns are installed on one side of the two fixed columns through moving mechanisms, Z-shaped arms are fixedly installed on the top of the two moving columns, and fixed clamping plates are fixedly installed on the end of the two Z-shaped arms and the two fixed arms. The linkage of the sliding plate and the gear and the rack is arranged, so that the middle clamping plate is always kept in the middle position of the upper and lower fixed clamping plates. After the reinforcing steel bar is clamped by the two fixed clamping plates, the middle clamping plate can precisely press the middle part of the reinforcing steel bar from the other side, so that the reinforcing steel bar is evenly stressed and centrally positioned in the length direction, the reinforcing steel bar is effectively prevented from being deviated, inclined or deformed due to unilateral stress, and multi-surface clamping and positioning of the reinforcing steel bar can be realized.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a rebar positioning device for building construction. Background Technology

[0002] During construction, rebar positioning devices are crucial equipment for ensuring accurate rebar tying, uniform spacing, and reasonable structural stress. They are widely used in the rebar construction phase of civil engineering projects such as factories and buildings. Before the installation, tying, and pouring of the rebar cage, positioning devices are needed to stably clamp and position the rebar, preventing problems such as rebar displacement, tilting, and misalignment, thereby ensuring the load-bearing strength and construction accuracy of building components.

[0003] While existing positioning devices can locate rebars of different heights, they are mostly unable to flexibly adjust the height and position of the clamping part according to the actual length of the rebar when dealing with rebars of different lengths. This results in poor clamping effect. Moreover, traditional devices can mostly only achieve single-sided or double-sided clamping of the rebar, and cannot simultaneously press the middle and sides of the rebar from multiple directions. The clamping point is singular and the tightening force is uneven, making the rebar prone to shaking and deflection. To address this issue, we disclose a rebar positioning device for building construction. Summary of the Invention

[0004] The purpose of this invention is to provide a rebar positioning device for building construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rebar positioning device for building construction, comprising a base, two fixed columns fixedly installed on the top of the base, fixed arms fixedly installed on the sides of the two fixed columns, movable columns installed on one side of the two fixed columns via a movable mechanism, Z-shaped arms fixedly installed on the top of the two movable columns, and fixed clamps fixedly installed at the ends of the two Z-shaped arms and the two fixed arms; a limit mechanism is installed on the two movable mechanisms; Both of the moving mechanisms are equipped with a central positioning mechanism, which is located between two fixed clamping plates arranged vertically and vertically; the central positioning mechanism is also equipped with a side positioning mechanism.

[0006] Preferably, the moving mechanism includes a sliding plate located at the middle of the fixed column and the moving column. The top of the sliding plate has two rectangular holes, and the fixed column and the moving column are slidably installed in the two rectangular holes. The inner walls of the two rectangular holes that are close to each other are provided with clearance holes, and gears are provided in the clearance holes. Upper racks and lower racks are fixedly installed on the sides of the fixed column and the moving column that are close to each other, respectively. The upper rack is located above the lower rack, and both the upper rack and the lower rack are located in the clearance holes. The upper rack and the clearance holes are meshed with the gears.

[0007] Preferably, the limiting mechanism includes a rotating sleeve, and each of the two sliding plates has a rotating hole on its side. The two rotating holes are respectively connected to two clearance holes. The rotating sleeve is rotatably installed in the two rotating holes. The two gears are fixedly sleeved on the rotating sleeve. A rotating column is rotatably installed inside the rotating sleeve. Turntables are fixedly installed at both ends of the rotating column. The sides of the two turntables that are close to each other are in contact with the two ends of the rotating sleeve. Limiting units are installed on both turntables.

[0008] Preferably, the limiting unit includes guide holes formed on the inner wall of one side of two rectangular holes, guide rods fixedly installed on the inner walls of both guide holes, guide blocks slidably sleeved on both guide rods, extrusion columns fixedly installed on the sides of both guide blocks, two oblique holes formed on the side of the turntable, one end of each of the two extrusion columns passing through the two oblique holes, and a locking block fixedly installed on the other side of each of the two guide blocks. Slide grooves are formed on the side of the fixed column and the moving column near the locking block, and multiple evenly spaced slots are formed on the inner walls of both slide grooves. The two locking blocks extend into two of the slots respectively.

[0009] Preferably, the groove on the movable column corresponds to the position of the lower rack, the groove on the fixed column corresponds to the position of the upper rack, and a limit spring is sleeved on the guide rod, with the two ends of the limit spring respectively fixedly installed on the side of the guide block and the inner wall of the guide hole.

[0010] Preferably, the central positioning mechanism includes a connecting column and a stud fixedly installed on the side of the sliding plate. A U-shaped arm is slidably sleeved on the connecting column. A fixing hole is opened on the side of the U-shaped arm near the sliding plate. One end of the stud passes through the fixing hole and is threaded with a nut. Two reset holes are opened on the side of the U-shaped arm away from the sliding plate. A reset rod is slidably installed in each of the two reset holes. An intermediate clamping plate is fixedly installed on one end of the two reset rods. The intermediate clamping plate is located in the middle of the two fixed clamping plates and corresponds to the position of the two fixed clamping plates. A compression frame is fixedly installed on the other end of the two reset rods.

[0011] Preferably, the edge positioning mechanism includes two positioning posts, which are symmetrically arranged based on the middle of the intermediate clamping plate. The top of the U-shaped arm has two mounting holes, and the two positioning posts are fixedly installed in the two mounting holes respectively. Two clamping arms are rotatably sleeved on each of the two positioning posts. The two clamping arms located on the same positioning post are located above and below the intermediate clamping plate respectively. Clamping grooves are provided on the sides of the four clamping arms near the intermediate clamping plate. Two pressure rods pass through the extrusion frame, and connecting rods are fixedly installed at both ends of the two pressure rods. The two connecting rods located on the same pressure rod are fixedly connected to the sides of the two clamping arms respectively.

[0012] Preferably, the two connecting rods located above or below the intermediate clamp are arranged in a cross-shaped and staggered manner.

[0013] Preferably, a reset spring is sleeved on the reset rod, and the two ends of the reset spring are respectively fixedly installed on the sides of the compression frame and the U-shaped arm that are close to each other.

[0014] Preferably, the top of the fixed column is provided with a circular groove, and the bottom of the Z-shaped arm is fixedly installed with a circular column, which is slidably installed in the circular groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This device uses the linkage between the sliding plate and the gear rack to keep the middle clamp plate always in the middle position between the upper and lower fixed clamp plates. After the steel bar is clamped by the fixed clamp plates on both sides, the middle clamp plate can precisely press the middle of the steel bar from the other side, so that the steel bar is evenly stressed and centrally positioned in the length direction, effectively preventing the steel bar from shifting, tilting or deforming due to unilateral stress.

[0016] This device allows for flexible adjustment of the height of the upper fixed clamping plate according to the length of the reinforcing bar. The limit switch can be released by rotating the turntable, and moving the movable column will cause the Z-shaped arm and the fixed clamping plate to rise and fall synchronously. The adjustment process is simple and quick. During adjustment, the gears mesh with the upper and lower racks, enabling synchronous movement of the movable columns on both sides to ensure consistent height. After adjustment, releasing the turntable allows the limit spring to automatically engage the locking blocks in the slots, achieving secure and stable positioning in four locations.

[0017] This device, through the coordinated operation of the central positioning mechanism and the side positioning mechanism, can achieve multi-directional synchronous clamping and fixing of reinforcing bars. Rotating the nut causes the central clamping plate to press the reinforcing bar, while simultaneously driving the four clamping arms to close synchronously and clamp the sides of the reinforcing bar. A single operation completes multi-faceted clamping and positioning of the reinforcing bar, ensuring firm and reliable positioning. After loosening the nut, the central clamping plate and clamping arms automatically return to their original positions under the action of the return spring, facilitating quick removal and placement of the reinforcing bar.

[0018] The upper rack of this device is fixed at the upper side of the fixed column, and the lower rack is fixed at the lower side of the moving column. The upper rack and the lower rack are arranged opposite to each other, and the gear of this application is located between the upper rack and the lower rack. This arrangement allows the fixed column and the moving column to move synchronously in opposite directions within a limited space. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the connection between the fixed column, the movable column, and the movable mechanism of the present invention; Figure 3 This is a perspective view showing the connection between the fixed column, the movable column, the moving mechanism, and the limiting mechanism of the present invention. Figure 4 This is a perspective view of the connection between the fixed column, the movable column, the gear, the upper rack, and the lower rack in this invention. Figure 5 This is a perspective view of the connection between the sliding plate and the limiting unit in this invention; Figure 6 This is a perspective view showing the connection between the sliding plate, the side positioning mechanism, and the center positioning mechanism in this invention. Figure 7 This is a perspective view showing the connection between the side positioning mechanism and the middle positioning mechanism in this invention; Figure 8 This is a perspective view of the edge positioning mechanism in this invention; Figure 9 This is a perspective view of the Z-shaped arm, the fixed clamp, and the cylindrical connection in this invention.

[0020] In the diagram: 1. Base; 2. Fixed column; 3. Moving column; 4. Z-shaped arm; 5. Fixed clamping plate; 6. Fixed arm; 7. Sliding plate; 8. Rotating sleeve; 9. Gear; 10. Circular groove; 11. Rotating column; 12. Turntable; 13. Inclined hole; 14. Upper rack; 15. Lower rack; 16. Slide groove; 17. Slot; 18. Clearance hole; 19. Guide block; 20. Extrusion column; 21. Guide rod; 22. Limiting spring; 23. Clamping block; 24. Connecting column; 25. U-shaped arm; 26. Intermediate clamping plate; 27. Nut; 28. Stud; 29. ​​Clamping groove; 30. Clamping arm; 31. Positioning column; 32. Connecting rod; 33. Pressure rod; 34. Extrusion frame; 35. Return spring; 36. Return rod; 37. Cylinder. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-9 This invention provides a technical solution: a rebar positioning device for building construction, comprising a base 1, two fixed columns 2 fixedly installed on the top of the base 1, fixed arms 6 fixedly installed on the sides of the two fixed columns 2, movable columns 3 installed on one side of the two fixed columns 2 via a movable mechanism, Z-shaped arms 4 fixedly installed on the top of the two movable columns 3, and fixed clamping plates 5 fixedly installed at the ends of the two Z-shaped arms 4 and the two fixed arms 6; limit mechanisms are installed on the two movable mechanisms; a central positioning mechanism is installed on the two movable mechanisms, the central positioning mechanism being located between the two vertically arranged fixed clamping plates 5; and a side positioning mechanism is installed on the central positioning mechanism.

[0023] like Figure 2 and Figure 4 As shown, the moving mechanism includes a sliding plate 7, which is located in the middle of the fixed column 2 and the moving column 3. The top of the sliding plate 7 has two rectangular holes, and the fixed column 2 and the moving column 3 are slidably installed in the two rectangular holes. The inner walls of the two rectangular holes that are close to each other are provided with clearance holes 18, and gears 9 are installed in the clearance holes 18. The upper rack 14 and the lower rack 15 are fixedly installed on the sides of the fixed column 2 and the moving column 3 that are close to each other, respectively. The upper rack 14 is located above the lower rack 15. Both the upper rack 14 and the lower rack 15 are located in the clearance holes 18, and the upper rack 14 and the clearance holes 18 are meshed with the gears 9. The moving column 3 moves, causing the lower rack 15 to move. The movement of the lower rack 15 causes the gear 9 to rotate. The rotation of the gear 9 drives the other gear 9 to rotate through the rotating sleeve 8, thus causing the other moving column 3 to move upward synchronously. At the same time, the two gears 9 also roll on the two upper racks 14, so that the two sliding plates 7 are always located between the two upper and lower fixed clamping plates 5. The two intermediate clamping plates 26 are also always located between the two upper and lower fixed clamping plates 5. This allows the intermediate clamping plates 26 to be positioned in the middle of the two fixed clamping plates 5 that are in contact with the reinforcing bar, pressing the other side of the reinforcing bar and making the reinforcing bar evenly stressed.

[0024] like Figure 2 and Figure 3As shown, the limiting mechanism includes a rotating sleeve 8. Two sliding plates 7 each have rotating holes on their sides, which are connected to two clearance holes 18. The rotating sleeve 8 is rotatably mounted within the two rotating holes. Two gears 9 are fixedly sleeved on the rotating sleeve 8. A rotating column 11 is rotatably mounted inside the rotating sleeve 8. Turntables 12 are fixedly mounted at both ends of the rotating column 11. The sides of the two turntables 12 that are close to each other contact the ends of the rotating sleeve 8. Limiting units are fitted onto both turntables 12. By rotating the turntables 12, the rotation of one turntable 12 drives the other turntable 12 to rotate via the rotating column 11. The rotation of the two turntables 12 compresses the four compression columns 20 through four oblique holes 13, thereby causing the four compression columns 20 to move.

[0025] like Figure 5 As shown, the limiting unit includes guide holes on the inner wall of one side of two rectangular holes. Guide rods 21 are fixedly installed on the inner walls of both guide holes. Guide blocks 19 are slidably sleeved on both guide rods 21. Extrusion columns 20 are fixedly installed on the sides of both guide blocks 19. Two oblique holes 13 are opened on the side of the turntable 12. One end of each of the two extrusion columns 20 passes through the two oblique holes 13. Locking blocks 23 are fixedly installed on the other side of each of the guide blocks 19. Slide grooves 16 are opened on the side of the fixed column 2 and the moving column 3 near the locking blocks 23. Multiple evenly spaced slots 17 are opened on the inner wall of each of the two slide grooves 16. The two locking blocks 23 extend into two of the slots 17 respectively. The movement of the four extrusion columns 20 drives the movement of the four guide blocks 19, compresses the four limiting springs 22, and drives the movement of the four guide blocks 19 to move the four locking blocks 23, thereby causing the four locking blocks 23 to move out of the four slots 17 respectively. At this time, the two moving columns 3 can move upward.

[0026] like Figure 2 , Figure 3 and Figure 4 As shown, the sliding groove 16 on the movable column 3 corresponds to the position of the lower rack 15, and the sliding groove 16 on the fixed column 2 corresponds to the position of the upper rack 14. The advantage of this arrangement is that the movable column 3 can still be fixed after it is moved.

[0027] like Figure 5 As shown, a limiting spring 22 is sleeved on the guide rod 21, and the two ends of the limiting spring 22 are fixedly installed on the side of the guide block 19 and the inner wall of the guide hole, respectively. The advantage of this arrangement is that the limiting spring 22 can make the guide block 19 return to its original shape.

[0028] like Figure 6 and Figure 7As shown, the central positioning mechanism includes a connecting column 24 and a stud 28 fixedly installed on the side of the sliding plate 7. A U-shaped arm 25 is slidably sleeved on the connecting column 24. A fixing hole is opened on the side of the U-shaped arm 25 near the sliding plate 7. One end of the stud 28 passes through the fixing hole and is threaded with a nut 27. Two reset holes are opened on the side of the U-shaped arm 25 away from the sliding plate 7. A reset rod 36 is slidably installed in each of the two reset holes. A middle clamping plate 26 is fixedly installed on one end of the two reset rods 36. The middle clamping plate 26 is located in the middle of the two fixed clamping plates 5 and corresponds to the position of the two fixed clamping plates 5. A compression frame 34 is fixedly installed on the other end of the two reset rods 36. The reinforcing bar is attached to the two upper and lower fixed clamping plates 5. By rotating the nut 27, the nut 27 moves spirally on the stud 28, causing the U-shaped arm 25 to move closer to the sliding plate 7. The movement of the U-shaped arm 25 drives the middle clamping plate 26 to move.

[0029] like Figure 6 and Figure 7 As shown, the side positioning mechanism includes two positioning posts 31, which are symmetrically arranged based on the middle of the intermediate clamping plate 26. Two mounting holes are opened at the top of the U-shaped arm 25, and the two positioning posts 31 are fixedly installed in the two mounting holes respectively. Two clamping arms 30 are rotatably sleeved on each of the two positioning posts 31. The two clamping arms 30 located on the same positioning post 31 are located above and below the intermediate clamping plate 26 respectively. Clamping grooves 29 are opened on the sides of the four clamping arms 30 near the intermediate clamping plate 26. Two pressure rods 33 pass through the extrusion frame 34. Connecting rods 32 are fixedly installed at both ends of the two pressure rods 33. The two connecting rods 32 located on the same pressure rod 33 are fixedly connected to the sides of the two clamping arms 30 respectively. Continue rotating nut 27 to bring intermediate clamping plate 26 closer to positioning post 31. The movement of intermediate clamping plate 26 drives the two reset rods 36 to move, which in turn drives the moving post 3 to move. The movement of compression frame 34 drives the two pressure rods 33 to rotate. The rotation of the two pressure rods 33 drives the four clamping arms 30 to rotate through four connecting rods 32. The four clamping arms 30 rotate and contact the two sides of the reinforcing bar. After the four clamping arms 30 clamp the other two sides of the reinforcing bar, the intermediate clamping plate 26 and the two fixed clamping plates 5 cooperate to clamp the two sides of the reinforcing bar along the direction of Z-shaped arm 4, thereby stabilizing the positioning of the reinforcing bar.

[0030] like Figure 6 and Figure 7 As shown, the two connecting rods 32 located above or below the intermediate clamping plate 26 are arranged in a cross-shaped and staggered manner. The advantage of this arrangement is that it facilitates the clamping arm 30 in clamping the reinforcing bar.

[0031] like Figure 7As shown, a reset spring 35 is sleeved on the reset rod 36, and the two ends of the reset spring 35 are respectively fixedly installed on the sides of the compression frame 34 and the U-shaped arm 25 that are close to each other. The reset spring 35 facilitates the restoration of the compression frame 34 to its original shape.

[0032] like Figure 2 and Figure 9 As shown, a circular groove 10 is provided at the top of the fixed column 2, and a circular column 37 is fixedly installed at the bottom of the Z-shaped arm 4. The circular column 37 is slidably installed in the circular groove 10. The circular column 37 allows the Z-shaped arm 4 to slide relative to the fixed column 2.

[0033] In use, the height of the uppermost fixed clamp 5 can be adjusted according to the length of the steel bar. During adjustment, the turntable 12 is rotated. The rotation of the turntable 12 drives the other turntable 12 to rotate through the rotating column 11. The rotation of the two turntables 12 squeezes the four squeezing columns 20 through the four inclined holes 13, thereby causing the four squeezing columns 20 to move. The movement of the four squeezing columns 20 drives the four guide blocks 19 to move, and the four limit springs 22 are compressed. The movement of the four guide blocks 19 drives the four locking blocks 23 to move, thereby causing the four locking blocks 23 to move out of the four locking slots 17 respectively. At this time, the two moving columns 3 can move upward. The moving column 3 moves, which drives the lower rack 15 to move. The movement of the lower rack 15 causes the gear 9 to rotate. The rotation of the gear 9 drives the other gear 9 to rotate through the rotating sleeve 8, so that the other moving column 3 also moves upward synchronously. At the same time, the two gears 9 also roll on the two upper racks 14, so that the two sliding plates 7 are always located between the two upper and lower fixed clamping plates 5, and the two intermediate clamping plates 26 are also always located between the two upper and lower fixed clamping plates 5. This allows the intermediate clamping plates 26 to be positioned in the middle of the two fixed clamping plates 5 that are in contact with the steel bar, pressing the other side of the steel bar so that the steel bar is subjected to uniform force. After adjustment, release the turntable 12. Under the force of the four limit springs 22, the four guide blocks 19 move, thereby causing the four locking blocks 23 to move. The four locking blocks 23 enter the corresponding four slots 17 respectively to complete the fixation. There are four fixing positions to facilitate stable fixation. Finally, the reinforcing bar is attached to the two upper and lower fixed clamping plates 5. By rotating the nut 27, the nut 27 moves spirally on the stud 28, causing the U-shaped arm 25 to approach the sliding plate 7. The movement of the U-shaped arm 25 drives the intermediate clamping plate 26 to move. After the intermediate clamping plate 26 contacts the other side of the reinforcing bar, the nut 27 is rotated again, causing the intermediate clamping plate 26 to approach the positioning post 31. The movement of the intermediate clamping plate 26 drives the two reset rods 36 to move, which in turn drives the moving post 3 to move. The compression frame 34 moves, causing the two pressure rods 33 to rotate. The rotation of the pressure rod 33 drives the four clamping arms 30 to rotate via the four connecting rods 32. The four clamping arms 30 rotate and contact the two sides of the reinforcing bar. After the four clamping arms 30 clamp the other two sides of the reinforcing bar, the intermediate clamping plate 26 and the two fixed clamping plates 5 cooperate to clamp the two sides of the reinforcing bar along the direction of the Z-shaped arm 4, thereby stabilizing the positioning of the reinforcing bar. When the intermediate clamping plate 26 moves, the return spring 35 will be stretched. When not fixed, the intermediate clamping plate 26 and the clamping arms 30 will return to their original state under the action of the return spring 35, which facilitates the insertion of the reinforcing bar.

Claims

1. A rebar positioning device for building construction, comprising a base (1), characterized in that: Two fixed columns (2) are fixedly installed on the top of the base (1). Fixed arms (6) are fixedly installed on the sides of the two fixed columns (2). Movable columns (3) are installed on one side of the two fixed columns (2) via a moving mechanism. Z-shaped arms (4) are fixedly installed on the top of the two moving columns (3). Fixed clamps (5) are fixedly installed at the ends of the two Z-shaped arms (4) and the two fixed arms (6). Limiting mechanisms are installed on the two moving mechanisms. A middle positioning mechanism is installed on the two moving mechanisms. The middle positioning mechanism is located in the middle of the two upper and lower fixed clamps (5). A side positioning mechanism is installed on the middle positioning mechanism. The moving mechanism includes a sliding plate (7). The sliding plate (7) is located in the middle of the fixed column (2) and the moving column (3). The top of the sliding plate (7) has two rectangular holes. The fixed column (2) and the moving column (3) are slidably installed in the two rectangular holes. The inner walls of the two rectangular holes are provided with clearance holes (18). The clearance holes (18) are provided with gears (9). The sides of the fixed column (2) and the moving column (3) are respectively fixedly installed with upper racks (14) and lower racks (15). The upper rack (14) is located above the lower rack (15). The upper rack (14) and the lower rack (15) are both located in the clearance holes (18). The upper rack (14) and the clearance holes (18) are both meshed with the gears (9).

2. The rebar positioning device for building construction according to claim 1, characterized in that: The limiting mechanism includes a rotating sleeve (8), and two sliding plates (7) have rotating holes on their sides. The two rotating holes are connected to two clearance holes (18) respectively. The rotating sleeve (8) is rotatably installed in the two rotating holes. The two gears (9) are fixedly sleeved on the rotating sleeve (8). A rotating column (11) is rotatably installed inside the rotating sleeve (8). Turntables (12) are fixedly installed at both ends of the rotating column (11). The sides of the two turntables (12) that are close to each other are in contact with the two ends of the rotating sleeve (8). Limiting units are installed on both turntables (12).

3. A rebar positioning device for building construction according to claim 2, characterized in that: The limiting unit includes guide holes on the inner wall of one side of two rectangular holes. Guide rods (21) are fixedly installed on the inner walls of both sides of the two guide holes. Guide blocks (19) are slidably sleeved on the two guide rods (21). Extrusion columns (20) are fixedly installed on the side of the two guide blocks (19). Two oblique holes (13) are opened on the side of the turntable (12). One end of the two extrusion columns (20) passes through the two oblique holes (13) respectively. A locking block (23) is fixedly installed on the other side of the two guide blocks (19). Slide grooves (16) are opened on the side of the fixed column (2) and the moving column (3) near the locking block (23). Multiple evenly arranged slots (17) are opened on the inner wall of the two slide grooves (16). The two locking blocks (23) extend into two of the slots (17) respectively.

4. A rebar positioning device for building construction according to claim 3, characterized in that: The sliding groove (16) on the movable column (3) corresponds to the position of the lower rack (15), the sliding groove (16) on the fixed column (2) corresponds to the position of the upper rack (14), and a limit spring (22) is sleeved on the guide rod (21). The two ends of the limit spring (22) are respectively fixedly installed on the side of the guide block (19) and the inner wall of the guide hole.

5. A rebar positioning device for building construction according to claim 1, characterized in that: The central positioning mechanism includes a connecting column (24) and a stud (28) fixedly installed on the side of the sliding plate (7). A U-shaped arm (25) is slidably sleeved on the connecting column (24). A fixing hole is opened on the side of the U-shaped arm (25) near the sliding plate (7). One end of the stud (28) passes through the fixing hole and is threaded with a nut (27). Two reset holes are opened on the side of the U-shaped arm (25) away from the sliding plate (7). A reset rod (36) is slidably installed in each of the two reset holes. A middle clamping plate (26) is fixedly installed on one end of the two reset rods (36). The middle clamping plate (26) is located in the middle of the two fixed clamping plates (5) and corresponds to the position of the two fixed clamping plates (5). A compression frame (34) is fixedly installed on the other end of the two reset rods (36).

6. A rebar positioning device for building construction according to claim 5, characterized in that: The side positioning mechanism includes two positioning posts (31), which are symmetrically arranged based on the middle of the intermediate clamping plate (26). The top of the U-shaped arm (25) has two mounting holes, and the two positioning posts (31) are fixedly installed in the two mounting holes respectively. Two clamping arms (30) are rotatably sleeved on each of the two positioning posts (31). The two clamping arms (30) located on the same positioning post (31) are located above and below the intermediate clamping plate (26) respectively. The four clamping arms (30) have clamping grooves (29) on their sides near the intermediate clamping plate (26). Two pressure rods (33) pass through the extrusion frame (34). Connecting rods (32) are fixedly installed at both ends of the two pressure rods (33). The two connecting rods (32) located on the same pressure rod (33) are fixedly connected to the sides of the two clamping arms (30) respectively.

7. A rebar positioning device for building construction according to claim 6, characterized in that: The two connecting rods (32) located above or below the intermediate clamp (26) are crossed and staggered.

8. A rebar positioning device for building construction according to claim 5, characterized in that: A reset spring (35) is sleeved on the reset rod (36), and the two ends of the reset spring (35) are respectively fixedly installed on the sides of the compression frame (34) and the U-shaped arm (25) that are close to each other.

9. A rebar positioning device for building construction according to claim 1, characterized in that: The top of the fixed column (2) is provided with a circular groove (10), and the bottom of the Z-shaped arm (4) is fixedly installed with a circular column (37), which is slidably installed in the circular groove (10).

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