A precast beam curing spray device

Abstract

The present invention discloses a precast beam curing spray device, which relates to the field of curing devices and includes a base water tank, a water tank top cover, a first bracket and a second bracket. The water tank top cover is fixedly installed on the top surface of the base water tank. The first bracket and the second bracket are placed outside the base water tank, and the first bracket is located on one side of the second bracket. The precast beam curing spray device of the present invention can perform comprehensive spraying without side nozzles, reducing the number of installed nozzles. It is deployed using water pressure, has a simple structure and is convenient to operate. It is more convenient for the comprehensive spraying curing of precast beams. By adjusting the spraying angle of the water mist nozzles, it can spray and cure the inclined plane of the precast beam body, enabling the precast beam on the inclined plane to also be comprehensively sprayed and cured. The adjustable range of the water mist spraying is wider, and it can be used in combination with precast beam bodies of different shapes for spraying and curing, further improving the application range of the device.

Description

Technical Field

[0001] The present invention relates to the field of maintenance devices, and particularly to a precast beam maintenance spraying device. Background Art

[0002] The precast beam maintenance spraying device is a device specifically used for the maintenance of precast beams. It sprays water mist or curing agent to maintain the precast beams, so as to improve their strength and durability, and is widely used in precast beam processing occasions;

[0003] The Chinese patent with the publication number "CN108972857A" discloses an "automatic maintenance spraying device for precast beams, including a water supply system, pipelines, nozzles and a timing valve. The timing valve includes a ball valve, a housing and a box body. There is a rotating shaft on the housing, and an impeller and a driving wheel are installed on the rotating shaft". Although it can achieve the effect of "the present invention realizes automatic closing, realizes water saving and achieves the effect of full spraying", when the device is in use, the water mist is sprayed through the nozzles to maintain the precast beams, and the nozzles are fixedly installed structures, which can only move in a single direction to achieve the water mist spraying effect. When spraying on different surfaces, only the number of nozzles can be increased. The nozzles installed in a single direction cannot perform comprehensive spraying. At the same time, with the improvement of building requirements, the shape requirements of precast beams are also gradually increasing. When spraying and maintaining precast beams with various inclined surfaces and inclination angles, the nozzles with a single fixed angle cannot spray the water mist onto the precast beams comprehensively, resulting in the inclined surface and inclination angle positions of the precast beams not being maintained, thereby reducing the maintenance effect. And when adding an angle adjustment mechanism for the nozzles, too many adjustment mechanisms lead to troublesome operation and increased volume, which also affects the spraying and maintenance use of the nozzles, making the device not suitable for spraying and maintaining precast beams with different shapes. Summary of the Invention

[0004] The main purpose of the present invention is to provide a precast beam maintenance spraying device, which can effectively solve the technical problems proposed in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A precast beam curing spray device, comprising a base water tank, a water tank top cover, a first support and a second support. The water tank top cover is fixedly installed on the top surface of the base water tank. The first support and the second support are placed outside the base water tank. The first support is located on one side of the second support. A driving screw is movably installed between the first support and the second support. A moving thread sleeve is threadedly installed on the outer side of the driving screw. A rotating clamping ring is integrally formed at the lower end of the moving thread sleeve. A rotating structure is movably installed at the bottom of the rotating clamping ring. Two mounting columns are movably installed at the lower end of the rotating structure. A synchronous gear is fixedly installed at the lower end of the mounting column. The lower end of the synchronous gear is movably connected to a top water spraying seat. A top joint is fixedly installed on the outer side of the top water spraying seat. Fixed sleeve rods are fixedly installed on the opposite surfaces of the two mounting columns. A guiding structure is fixedly installed on the outer sides of the fixed sleeve rods and the top joint. One end of the fixed sleeve rod far from the mounting column is movably installed with a telescopic rod. A bottom water spraying seat is fixedly installed at the lower end of the telescopic rod. A bottom joint is fixedly installed on the outer side of the bottom water spraying seat. Water mist nozzles are fixedly installed at one end of the bottom water spraying seat and the lower end of the top water spraying seat.

[0007] As a further solution of the present invention, slope plates are fixedly installed on both sides of the base water tank. Two rows of water permeable holes are provided on the top surface of the water tank top cover. A bearing plate is arranged above the water tank top cover. A plurality of moving wheels placed above the water tank top cover are movably installed at the front end and the rear end of the bearing plate. A precast beam main body is placed above the bearing plate.

[0008] As a further solution of the present invention, a water suction pipe is fixedly installed at the front end of the base water tank. A water spraying pump is fixedly installed at the front end of the water suction pipe. A water spraying joint is fixedly installed at the output port of the water spraying pump. A plurality of water spraying conveying pipes are fixedly installed at the upper end of the water spraying joint. One end of the water spraying conveying pipe far from the water spraying joint is fixedly connected to the top joint and the bottom joint.

[0009] As a further solution of the present invention, a driving motor is fixedly installed on one side of the top of the first support. A rotating mounting seat is fixedly installed on one side of the top of the second support. One end of the driving screw is movably connected to the rotating mounting seat. The rotating shaft of the driving motor is fixedly connected to the other end of the driving screw. A guiding rod is fixedly installed between the first support and the second support at the upper end of the driving screw. A guiding sleeve is fixedly installed at the upper end of the moving thread sleeve. The guiding sleeve is sleeved on the outer side of the guiding rod.

[0010] As a further solution of the present invention, the rotating structure includes a rotating suspension column, an adjusting rod, a steel ball slot and a spring steel ball. The rotating suspension column is movably installed inside the rotating clamping ring. The adjusting rod is welded on the outer side of the rotating suspension column. A plurality of steel ball slots are opened on the central plane of the top of the rotating suspension column. The spring steel ball is movably installed inside the rotating clamping ring.

[0011] As a further solution of the present invention, the rotating suspension column rotates around the rotating snap ring, the spring steel ball is embedded in the steel ball slot for mating connection, and the two mounting columns are movably mounted at the lower end of the rotating suspension column.

[0012] As a further solution of the present invention, the top water spray seat is located below the fixed sleeve rod, the two synchronous gears are meshed and connected, and the two mounting columns rotate synchronously through the synchronous gears.

[0013] As a further solution of the present invention, the diversion structure includes a diversion joint, a diversion pipe and a switch valve. The diversion joint is fixedly installed on the outer side of the fixed sleeve rod, the diversion pipe is fixedly installed at one end of the diversion joint, and the switch valve is movably installed at the center of the outer side of the diversion pipe.

[0014] As a further solution of the present invention, the lower end of the diversion pipe is connected to the top joint in a through manner, the diversion pipe is in through connection with the inside of the fixed sleeve rod through the diversion joint, the fixed sleeve rod and the telescopic rod are both arc-shaped and arranged concentrically, and the telescopic rod is inserted into the fixed sleeve rod for telescopic movement.

[0015] As a further solution of the present invention, the water mist nozzles are located outside the precast beam main body, and the water mist nozzles on both sides are symmetrically arranged and installed.

[0016] Compared with the prior art, the present invention has the following beneficial effects: when it is necessary to spray the side of the precast beam main body, the bottom water spray seats on both sides are expanded in an arc shape, and then the bottom water spray seats and the water mist nozzles on both sides move to both sides of the precast beam main body to spray and maintain the side of the precast beam main body. Comprehensive spraying can be carried out without side nozzles, reducing the number of installed nozzles, using water pressure for expansion, with a simple structure and convenient operation, and being more convenient for the comprehensive spraying and maintenance of precast beams;

[0017] When it is necessary to adjust the spraying angle of the water mist nozzles, the two mounting columns and the fixed sleeve rod rotate synchronously to change the angle of the lower water mist nozzles, so as to adjust the angle of the water mist sprayed by the water mist nozzles, and the inclined surface of the precast beam main body can be sprayed and maintained, so that the precast beam on the inclined surface can also be comprehensively sprayed and maintained, improving the maintenance effect of the device;

[0018] When it is necessary to adjust the overall spraying direction of the water mist nozzles, adjust the angle of the rotating suspension column to adjust the overall direction of the lower water mist nozzles, and then cooperate with the expansion and angle adjustment of the water mist nozzles on both sides, so that the water mist nozzles spray water mist in multiple directions and at multiple angles, and the adjustable range of the water mist spraying is wider. It is used for spraying and maintaining precast beam main bodies with different shapes, further improving the application range of the device. At the same time, the structure is simple and the operation is convenient, so that the device can be used for spraying and maintaining various precast beams with different shapes. Description of the Drawings

[0019] Figure 1 This is the overall structural schematic diagram of a precast beam curing spray device of the present invention;

[0020] Figure 2 This is the enlarged view of the base water tank in a precast beam curing spray device of the present invention;

[0021] Figure 3 This is the enlarged view of the first bracket and the second bracket in a precast beam curing spray device of the present invention;

[0022] Figure 4 This is the structural diagram of the telescopic rod being retracted into the fixed sleeve rod in a precast beam curing spray device of the present invention;

[0023] Figure 5 This is the structural diagram of the telescopic rod after expansion in a precast beam curing spray device of the present invention;

[0024] Figure 6 This is the enlarged view of the fixed sleeve rod in a precast beam curing spray device of the present invention;

[0025] Figure 7 This is the dissection diagram of the rotary snap ring in a precast beam curing spray device of the present invention;

[0026] Figure 8 This is the structural diagram of the fixed sleeve rod and the rotary hanging column after rotation in a precast beam curing spray device of the present invention.

[0027] In the figure: 1. Base water tank; 2. Water tank top cover; 3. Permeable hole; 4. Up and down slope plate; 5. Suction pipe; 6. Spray water pump; 7. Spray water joint; 8. Spray water delivery pipe; 9. First bracket; 10. Second bracket; 11. Driving motor; 12. Rotary mounting seat; 13. Driving screw rod; 14. Guide rod; 15. Moving thread sleeve; 16. Guide sleeve; 17. Rotary snap ring; 18. Rotary structure; 19. Rotary hanging column; 20. Adjusting rod; 21. Steel ball card slot; 22. Spring steel ball; 23. Mounting column; 24. Synchronous gear; 25. Top spray water seat; 26. Top joint; 27. Fixed sleeve rod; 28. Diversion structure; 29. Diversion joint; 30. Diversion pipeline; 31. Switch valve; 32. Telescopic rod; 33. Bottom spray water seat; 34. Bottom joint; 35. Water mist nozzle; 36. Bearing plate; 37. Moving wheel; 38. Precast beam main body. Detailed implementation manners

[0028] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0029] As Figures 1-8As shown in the figure, a precast beam curing spray device includes a base water tank 1, a water tank top cover 2, a first bracket 9 and a second bracket 10. The water tank top cover 2 is fixedly installed on the top surface of the base water tank 1. The first bracket 9 and the second bracket 10 are placed outside the base water tank 1. The first bracket 9 is located on one side of the second bracket 10. A driving screw 13 is movably installed between the first bracket 9 and the second bracket 10. A moving threaded sleeve 15 is threadedly installed on the outer side of the driving screw 13. A rotating snap ring 17 is integrally formed at the lower end of the moving threaded sleeve 15. A rotating structure 18 is movably installed at the bottom of the rotating snap ring 17. Two mounting columns 23 are movably installed at the lower end of the rotating structure 18. A synchronous gear 24 is fixedly installed at the lower end of the mounting column 23. The lower end of the synchronous gear 24 is movably connected to a top water spraying seat 25. A top joint 26 is fixedly installed on the outer side of the top water spraying seat 25. Fixed sleeve rods 27 are fixedly installed on the opposite surfaces of the two mounting columns 23. A diversion structure 28 is fixedly installed on the outer sides of the fixed sleeve rods 27 and the top joint 26. One end of the fixed sleeve rod 27 away from the mounting column 23 is movably installed with a telescopic rod 32. A bottom water spraying seat 33 is fixedly installed at the lower end of the telescopic rod 32. A bottom joint 34 is fixedly installed on the outer side of the bottom water spraying seat 33. Water mist nozzles 35 are fixedly installed at one end of the bottom water spraying seat 33 and the lower end of the top water spraying seat 25.

[0030] In this embodiment, slope plates 4 are fixedly installed on both sides of the base water tank 1. The slope plates 4 play the role of slopes, enabling the moving wheels 37 to move from the slope plates 4 to the water tank top cover 2. Two rows of water permeable holes 3 are opened on the top surface of the water tank top cover 2. The water permeable holes 3 can allow the dripping water to pass through and enter the base water tank 1 for collection. A bearing plate 36 is arranged above the water tank top cover 2. A plurality of moving wheels 37 placed above the water tank top cover 2 are movably installed at the front end and the rear end of the bearing plate 36. A precast beam main body 38 is placed above the bearing plate 36, and the bearing plate 36 is used to place the precast beam main body 38.

[0031] In this embodiment, a water suction pipe 5 is fixedly installed at the front end of the base water tank 1. A water spraying pump 6 is fixedly installed at the front end of the water suction pipe 5. A water spraying joint 7 is fixedly installed at the output port of the water spraying pump 6. A plurality of water spraying conveying pipes 8 are fixedly installed at the upper end of the water spraying joint 7. The ends of the water spraying conveying pipes 8 away from the water spraying joint 7 are fixedly connected to the top joint 26 and the bottom joint 34. The water spraying pump 6 pumps out the water in the base water tank 1 through the water suction pipe 5 and transports it to the water spraying joint 7 and the water spraying conveying pipes 8.

[0032] In this embodiment, a driving motor 11 is fixedly installed on one side of the top of the first bracket 9, a rotating mounting seat 12 is fixedly installed on one side of the top of the second bracket 10, one end of a driving screw 13 is movably connected to the rotating mounting seat 12, the rotating shaft of the driving motor 11 is fixedly connected to the other end of the driving screw 13, a guide rod 14 is fixedly installed between the first bracket 9 and the second bracket 10 at the upper end of the driving screw 13, a guide sleeve 16 is fixedly installed at the upper end of the moving threaded sleeve 15, the guide sleeve 16 is sleeved outside the guide rod 14, the driving motor 11 drives the driving screw 13 to rotate, and the driving screw 13 drives the moving threaded sleeve 15 to move through threaded connection. The guide sleeve 16 and the guide rod 14 play a role in positioning the moving threaded sleeve 15.

[0033] In this embodiment, the rotating structure 18 includes a rotating hanging column 19, an adjusting rod 20, a steel ball card slot 21 and a spring steel ball 22. The rotating hanging column 19 is movably installed inside the rotating snap ring 17, the adjusting rod 20 is welded to the outside of the rotating hanging column 19, a plurality of steel ball card slots 21 are formed in the central plane of the top of the rotating hanging column 19, the spring steel ball 22 is movably installed inside the rotating snap ring 17, the spring steel ball 22 is composed of a spring and a steel ball, and the spring pushes the steel ball into the steel ball card slot 21 to position the rotating hanging column 19.

[0034] In this embodiment, the rotating hanging column 19 rotates around the rotating snap ring 17, the spring steel ball 22 is embedded in the steel ball card slot 21 for mating connection, two mounting columns 23 are movably installed at the lower end of the rotating hanging column 19, and the rotating hanging column 19 adjusts the angle of the lower mounting column 23 through rotation.

[0035] In this embodiment, the top water spraying seat 25 is located below the fixed sleeve rod 27, and the two synchronous gears 24 are meshed with each other. Through the meshing connection of the synchronous gears 24, the two mounting columns 23 rotate synchronously through the synchronous gears 24.

[0036] In this embodiment, the diversion structure 28 includes a diversion joint 29, a diversion pipe 30 and a switch valve 31. The diversion joint 29 is fixedly installed on the outside of the fixed sleeve rod 27, the diversion pipe 30 is fixedly installed at one end of the diversion joint 29, the switch valve 31 is movably installed at the center of the outside of the diversion pipe 30, and the switch valve 31 plays a role in controlling the opening and closing of the inside of the diversion pipe 30.

[0037] In this embodiment, the lower end of the diversion pipe 30 is connected to the top joint 26 in a through manner, the diversion pipe 30 is connected to the inside of the fixed sleeve rod 27 through the diversion joint 29, both the fixed sleeve rod 27 and the telescopic rod 32 are arc-shaped and arranged concentrically, the telescopic rod 32 is inserted into the fixed sleeve rod 27 for telescopic movement, and the water received by the top joint 26 flows into the diversion joint 29 through the diversion pipe 30. The telescopic rod 32 is a two-end telescopic structure and is inserted into the fixed sleeve rod 27 for movable connection.

[0038] In this embodiment, the water mist nozzles 35 are located outside the prefabricated beam body 38 , and the water mist nozzles 35 on both sides are symmetrically arranged and installed. The water mist nozzles 35 have the effect of spraying water mist onto the prefabricated beam body 38 .

[0039] It should be noted that the present invention is a prefabricated beam maintenance spray device. When in use, the base water tank 1 and the up-down ramp plate 4 are placed on the ground, and the prefabricated beam body 38 is placed on the bearing plate 36. The prefabricated beam body 38 is moved to the top of the water tank top cover 2 on the base water tank 1 by the rotation of the moving wheel 37 under the bearing plate 36, so that the prefabricated beam body 38 moves to the inner side of the first bracket 9 and the second bracket 10, and the water mist nozzle 35 is located above the prefabricated beam body 38. Water is stored in the base water tank 1. The water in the base water tank 1 is pumped out through the pumping pipe 5 by the operation of the water spray pump 6, and then the water is sprayed through the water spray joint 7 and The water is delivered to the top joint 26 and the bottom joint 34 by the water spray delivery pipe 8, so that the water enters the top water spray seat 25 and the bottom water spray seat 33, and finally sprayed out from the water mist nozzle 35 to form water mist sprayed on the precast beam body 38. The driving motor 11 is driven to rotate the driving screw 13, and the rotation of the driving screw 13 drives it to move left and right through the threaded connection with the moving thread sleeve 15, thereby driving the multiple water mist nozzles 35 below to move left and right, so that the water mist nozzles 35 move to spray the entire section of the precast beam body 38, so as to spray and maintain the precast beam body 38;

[0040] When it is necessary to spray the side of the precast beam body 38, the top joint 26 is connected to the diversion joint 29 through the diversion pipe 30. Therefore, after the switch valve 31 is opened, the water received by the top joint 26 will also be transported to the diversion joint 29 through the diversion pipe 30, and then enter the fixed sleeve rods 27 on both sides. Then, the water pressure generated in the fixed sleeve rod 27 pushes the telescopic rod 32 to extend outward from the fixed sleeve rod 27, so that the bottom water spray seats 33 on both sides expand in an arc shape, and then the bottom water spray seats 33 and the water mist nozzles 35 on both sides move to both sides of the precast beam body 38 to spray and maintain the side of the precast beam body 38;

[0041] When the spray angle of the water mist nozzle 35 needs to be adjusted, the fixed sleeve rod 27 is bent to rotate the mounting column 23, and the meshing connection of the synchronous gears 24 at the lower ends of the two mounting columns 23 rotates synchronously, so that the two mounting columns 23 and the fixed sleeve rod 27 rotate synchronously, and the angle of the water mist nozzle 35 below is changed to adjust the spray angle of the water mist nozzle 35, and the bevel surface of the prefabricated beam body 38 is sprayed for maintenance;

[0042] When it is necessary to adjust the overall spraying direction of the water mist nozzle 35, pull the adjusting rod 20 up and down to drive the rotating suspension column 19 to rotate inside the rotating snap ring 17. When the rotating suspension column 19 rotates, it presses the spring in the spring steel ball 22 to contract. After the rotating suspension column 19 rotates, the spring in the spring steel ball 22 pushes the steel ball to snap into the steel ball slot 21 to position the rotating suspension column 19, thereby adjusting the angle of the rotating suspension column 19 to adjust the overall direction of the water mist nozzle 35 below. Then, in cooperation with the expansion and angle adjustment of the water mist nozzles 35 on both sides, the water mist nozzles 35 spray water mist in multiple directions and at multiple angles, and the adjustable range of the water mist spraying is wider, which is used for spray curing in cooperation with the precast beam body 38 of different shapes.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A precast beam curing spray device, comprising a base water tank (1), a water tank top cover (2), a first bracket (9) and a second bracket (10). The water tank top cover (2) is fixedly installed on the top surface of the base water tank (1). The first bracket (9) and the second bracket (10) are placed outside the base water tank (1). The first bracket (9) is located on one side of the second bracket (10), and it is characterized in that: A drive screw (13) is movably installed between the first bracket (9) and the second bracket (10). A moving threaded sleeve (15) is installed on the outer side of the drive screw (13) by threads. A rotary snap ring (17) is integrally formed at the lower end of the moving threaded sleeve (15). A rotary structure (18) is movably installed at the bottom of the rotary snap ring (17). Two mounting columns (23) are movably installed at the lower end of the rotary structure (18). A synchronous gear (24) is fixedly installed at the lower end of the mounting column (23). The lower end of the synchronous gear (24) is movably connected to a top water spray seat (25). A top joint (26) is fixedly installed on the outer side of the top water spray seat (25). Fixed sleeve rods (27) are fixedly installed on the opposite surfaces of the two mounting columns (23). A flow guiding structure (28) is fixedly installed on the outer sides of the fixed sleeve rods (27) and the top joint (26). One end of the fixed sleeve rod (27) far away from the mounting column (23) movably installs a telescopic rod (32). A bottom water spray seat (33) is fixedly installed at the lower end of the telescopic rod (32). A bottom joint (34) is fixedly installed on the outer side of the bottom water spray seat (33). Water mist nozzles (35) are fixedly installed at one end of the bottom water spray seat (33) and the lower end of the top water spray seat (25); Slope plates (4) are fixedly installed on both sides of the base water tank (1). Two rows of water permeable holes (3) are formed on the top surface of the water tank top cover (2). A bearing plate (36) is arranged above the water tank top cover (2). A plurality of moving wheels (37) placed above the water tank top cover (2) are movably installed at the front end and the rear end of the bearing plate (36). A precast beam body (38) is placed above the bearing plate (36); A water suction pipe (5) is fixedly installed at the front end of the base water tank (1). A water spray pump (6) is fixedly installed at the front end of the water suction pipe (5). A water spray joint (7) is fixedly installed at the output port of the water spray pump (6). A plurality of water spray delivery pipes (8) are fixedly installed at the upper end of the water spray joint (7). One end of the water spray delivery pipe (8) far away from the water spray joint (7) is fixedly connected to the top joint (26) and the bottom joint (34); A drive motor (11) is fixedly installed on one side of the top of the first bracket (9). A rotary mounting seat (12) is fixedly installed on one side of the top of the second bracket (10). One end of the drive screw (13) is movably connected to the rotary mounting seat (12). The rotating shaft of the drive motor (11) is fixedly connected to the other end of the drive screw (13). A guide rod (14) is fixedly installed between the first bracket (9) and the second bracket (10) above the drive screw (13). A guide sleeve (16) is fixedly installed at the upper end of the moving threaded sleeve (15). The guide sleeve (16) is sleeved on the outer side of the guide rod (14); The rotating structure (18) includes a rotating suspension column (19), an adjusting rod (20), a steel ball slot (21) and a spring steel ball (22). The rotating suspension column (19) is movably installed inside the rotating clamping ring (17). The adjusting rod (20) is welded to the outside of the rotating suspension column (19). A plurality of steel ball slots (21) are formed in the top central plane of the rotating suspension column (19). The spring steel ball (22) is movably installed inside the rotating clamping ring (17). The rotating suspension column (19) rotates around the rotating clamping ring (17). The spring steel ball (22) is embedded into the steel ball slot (21) for mating connection. Two mounting columns (23) are movably installed at the lower end of the rotating suspension column (19). The top water spray seat (25) is located below the fixed sleeve rod (27). The two synchronous gears (24) are meshed with each other. The two mounting columns (23) rotate synchronously through the synchronous gears (24). The diversion structure (28) includes a diversion joint (29), a diversion pipe (30) and a switching valve (31). The diversion joint (29) is fixedly installed on the outside of the fixed sleeve rod (27). The diversion pipe (30) is fixedly installed at one end of the diversion joint (29). The switching valve (31) is movably installed at the outer center of the diversion pipe (30). The lower end of the diversion pipe (30) is connected to the top joint (26) in a through manner. The diversion pipe (30) is connected to the inside of the fixed sleeve rod (27) through the diversion joint (29). Both the fixed sleeve rod (27) and the telescopic rod (32) are arranged in an arc shape and concentrically. The telescopic rod (32) is inserted into the fixed sleeve rod (27) for telescopic movement. The water mist nozzles (35) are located outside the precast beam body (38). The water mist nozzles (35) on both sides are symmetrically arranged and installed.

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