Bridge construction heat preservation device
By using a composite structure of protective cotton, insulation layer and air bladder tube, combined with the design of drive motor and connecting block, the problem of heat loss during bridge construction was solved, achieving efficient temperature control and structural adaptation, and improving energy utilization.
Patent Information
- Application Number
- CN202511964766.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-02-06
AI Technical Summary
In existing bridge construction, flexible materials are difficult to fit tightly into irregular structures, resulting in severe heat loss. Rigid insulation boards cannot be adapted to curved surfaces, causing heat to concentrate or dissipate, resulting in low energy utilization.
It adopts a composite structure of protective cotton, insulation layer and air bladder tube. The drive motor drives the pull rope to fix it, the air bladder tube maintains the expansion pressure, the air tube is connected, the connecting block and buckle are positioned to form a closed thermal cycle, which can be adapted to piers of different heights.
It improves heat utilization, avoids heat loss, flexibly adapts to irregular structures, and simplifies the assembly and disassembly process.
Smart Images
Figure CN121473250A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of heat preservation equipment, in particular to a bridge construction heat preservation device. BACKGROUND
[0002] The bridge is a structure built for roads to cross natural or artificial obstacles, and the bridge is composed of a bridge span structure, a support system, a bridge pier, an abutment, a bearing platform and a pile foundation, and can be divided into a beam bridge, an arch bridge, a suspension bridge and the like according to the structure, and the application scenarios are different, in the bridge engineering construction, the low temperature environment has a significant influence on the concrete curing, the steel structure welding and other key processes, if the temperature of the concrete is lower than 5 DEG C during the condensation process, the hydration reaction will be slow, the strength will be insufficient, and even the frost heaving cracks will be generated, the steel structure welding can generate cold cracks due to the large temperature difference, and the engineering quality is seriously affected, therefore, the temperature of the construction area needs to be maintained stable through the heat preservation device.
[0003] In the bridge construction, flexible materials such as heat preservation quilt and canvas can be used, but the flexible materials depend on manual binding and fixing, and it is difficult to closely fit the irregular structures such as bridge piers and beam bodies, for example, at the variable cross-section part of the circular pier column and the square bearing platform, the heat preservation quilt cannot be adapted to the sudden change of the curved surface due to the limitation of the material ductility, and when the heat preservation quilt is manually pulled, 5-10cm wrinkles and gaps can be formed at the joint, and even repeated adjustment cannot completely flatten the wrinkles and gaps, at the right angle corner of the beam web and the flange plate, the canvas will appear tight on the outside and loose on the inside after being bound due to the stress concentration of the right angle, and the loose part and the surface of the beam body form a triangular gap, for the prestressed pipe hole reserved on the surface of the beam body, even if the heat preservation quilt is cut into a gap with a corresponding diameter, the edge of the gap will form an annular gap with the outer wall of the pipe due to the material rebound, and the heat loss is caused by the gap, when the hard insulation board is used, the hard insulation board has good rigidity, but cannot adapt to the arc surface, and the joints are easy to leak air, when the local heating is performed by using the electric heating sheet, the heat is concentrated at the contact point, and local overheating and insufficient temperature in other areas are easy to occur, when the hot air blower is directly blown, the hot air is easy to escape from the gap, and the energy utilization rate is low, in order to solve the above problems, the present application provides a bridge construction heat preservation device. SUMMARY
[0004] In view of the problems in the prior art, the present application provides a bridge construction heat preservation device.
[0005] The technical scheme adopted by the present application to solve the technical problems is that the bridge construction heat preservation device comprises a mounting box, a rotating rod is rotatably connected to the inner wall of the mounting box, and protective cotton is fixedly connected to the lower surface of the mounting box in a symmetrical manner. The outer wall of the protective cotton is fixedly connected with a heat preservation layer, a plurality of air bag tubes are fixedly connected with the outer wall of one side of the heat preservation layer at equal intervals, air holes are provided in the outer wall of one end of the heat preservation layer at equal intervals and air tubes are fixedly connected with the air holes, the air tubes penetrate into the protective cotton, the protective cotton and the heat preservation layer are integrally arranged, and the outer wall of one end of the protective cotton, the heat preservation layer and the air bag tubes away from the mounting box are fixedly connected with a connecting block.
[0006] Specifically, the outer wall of the rotating rod is fixedly connected with a pull rope at equal intervals, the pull rope penetrates the interlayer between the protective cotton and the heat preservation layer, the pull rope and the air bag tube are arranged alternately, the outer wall of one end of the mounting box away from the pull rope is fixedly connected with a sliding pipe, the inner wall of the sliding pipe is slidably connected with a fixed pipe, the pull rope extends into the fixed pipe and is fixed, a screw hole is arranged on the outer wall of one end of the fixed pipe and a first fixing screw is threadedly connected with the screw hole, the first fixing screw abuts against the pull rope, the other end of the first fixing screw extends out of the fixed pipe and is fixedly connected with a first handle, and the inner bottom wall of the sliding pipe is fixedly connected with a first spring, and the other end of the first spring is fixedly connected with the fixed pipe.
[0007] Specifically, a connecting hole is provided in the outer wall of one side of the connecting block, a rotating shaft is rotatably connected with the inner wall of the connecting hole, a sealing block is fixedly connected with the outer wall of the rotating shaft, a sealing ring is fixedly connected with the outer wall of the sealing block, the sealing ring abuts against the connecting block, an inclined pushing surface is arranged on the outer wall of one end of the sealing block away from the sealing ring, a vertical slot is provided in the inner wall of one side of the connecting block away from the sealing block, a sliding block is slidably connected with the inner wall of the vertical slot, an L-shaped buckle is fixedly connected with the sliding block extending out of the vertical slot, a clamping groove is provided in the inner wall of the connecting hole relative to the position of the L-shaped buckle, the L-shaped buckle is matched with the clamping groove, and the clamping groove is located on one side of the sealing block.
[0008] Specifically, a screw hole is provided in the inner wall of one side of the connecting hole, a second fixing screw is threadedly connected with the inner wall of the screw hole, one end of the second fixing screw extends into the connecting hole and is rotatably connected with an arc-shaped pressing block, and an arc-shaped groove matched with the arc-shaped pressing block is provided in the outer wall of one side of the L-shaped buckle.
[0009] Specifically, a driving motor is fixedly connected with the outer wall of one side of the mounting box through a shaft coupling.
[0010] Specifically, the sliding block is arranged in a T shape, a second spring is fixedly connected with the inner bottom wall of the vertical slot, and the other end of the second spring is fixedly connected with the sliding block.
[0011] Specifically, the inner wall of the connecting hole is fixedly connected with a torsion spring, one end of the torsion spring is fixedly connected with a sealing block, and the torsion spring is wound on the outer wall of the rotating shaft.
[0012] Specifically, a temperature control exhaust valve is fixed to the outer wall of the air bag tube, and supporting legs are arranged at the four corners of the mounting box.
[0013] The beneficial effects of the present application are as follows: the pier column is wrapped with the composite structure of the protective cotton, the thermal insulation layer and the air bag tube, the thermal insulation layer is fixed by the driving motor and the pull rope, the heat loss problem caused by the poor adhesion of the thermal insulation layer is solved, the hot air generated by the heating fan is distributed through the connecting block hot air cavity, the air bag tube maintains the inflation pressure while directly reaching the interlayer of the protective cotton and the thermal insulation layer, the air bag tube is communicated with the interlayer of the protective cotton and the thermal insulation layer through the air pipe, a closed heat cycle is formed, the heat utilization rate is improved, the connecting block is positioned through the L-shaped buckle and the clamping groove, and is rigidly fixed in cooperation with the arc-shaped pressing block, different heights of the pier column can be flexibly adapted, and the problem of complicated disassembly and assembly of the thermal insulation shed is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0014] The present application will be further described below in combination with the drawings and examples.
[0015] Figure 1 A front view structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 2 A bottom view structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 3 A rotating rod installation position structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 4 A connecting block connection cross-sectional structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 5 A connecting block cross-sectional structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 6 A sliding pipe cross-sectional structural diagram of the bridge construction heat preservation device provided by the present application is provided. Figure 7 An air bag tube and pull rope installation position structural diagram of the bridge construction heat preservation device provided by the present application is provided.
[0016] In the figure: 1, mounting box; 2, rotating rod; 3, protective cotton; 4, thermal insulation layer; 5, air bag tube; 6, air pipe; 7, connecting block; 8, heating fan; 9, pull rope; 10, sliding pipe; 11, fixed pipe; 12, first fixed screw; 13, first spring; 14, sealing block; 15, sealing ring; 16, sliding block; 17, L-shaped buckle; 18, clamping groove; 19, second fixed screw; 20, arc-shaped pressing block; 22, driving motor; 23, second spring; 24, torsion spring. Detailed Implementation
[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0018] like Figures 1-7 As shown, the present invention provides the following technical solution: Example 1: A bridge construction insulation device includes a mounting box 1, a rotating rod 2 rotatably connected to the inner wall of the mounting box 1, and protective cotton 3 symmetrically fixedly connected to the lower surface of the mounting box 1. The outer wall of the protective cotton 3 is fixedly connected to the insulation layer 4. Several airbag tubes 5 are fixedly connected at equal intervals on one side of the outer wall of the insulation layer 4. Airbag tubes 5 are located at one end of the outer wall of the insulation layer 4 and are equidistantly provided with air holes and fixedly connected with air pipes 6. The air pipes 6 penetrate into the protective cotton 3. The protective cotton 3 and the insulation layer 4 are integrated. The outer wall of the protective cotton 3, the insulation layer 4 and the airbag tubes 5 away from the installation box 1 is fixedly connected to a connecting block 7. The outer wall of the connecting block 7 is fixedly connected to a heating fan 8. The output end of the heating fan 8 extends into the connecting hole through an air pipe.
[0019] Pull ropes 9 are fixedly connected at equal intervals to the outer wall of the rotating rod 2. The pull ropes 9 pass through the interlayer between the protective cotton 3 and the insulation layer 4. The pull ropes 9 and the airbag tube 5 are alternately arranged. A sliding tube 10 is fixedly connected to the outer wall of the end of the mounting box 1 away from the pull ropes 9. A fixed tube 11 is slidably connected to the inner wall of the sliding tube 10. The pull ropes 9 extend into the fixed tube 11 and are fixed. A screw hole is provided on the outer wall of one end of the fixed tube 11 and a first fixed screw 12 is threadedly connected to it. The first fixed screw 12 abuts against the pull ropes 9. The other end of the first fixed screw 12 extends to the outside of the fixed tube 11 and is fixed with a first handle. A first spring 13 is fixedly connected to the inner bottom wall of the sliding tube 10. The other end of the first spring 13 is fixedly connected to the fixed tube 11. A connecting hole is provided through one side of the outer wall of the connecting block 7. A rotating shaft is rotatably connected to the inner wall of the connecting hole. A sealing block 14 is fixedly connected to the outer wall of the rotating shaft. A sealing ring 15 is fixedly connected to the outer wall of the sealing block 14. The sealing ring 15 abuts against the connecting block 7. An inclined push surface is provided on the outer wall of the end of the sealing block 14 away from the sealing ring 15. A vertical groove is provided through one side of the inner wall of the connecting block 7 on the sealing block 14. A slider 16 is slidably connected to the inner wall of the vertical groove. The slider 16 extends to the outside of the vertical groove and is fixedly connected to an L-shaped buckle 17. A slot 18 is provided through one side of the connecting hole relative to the position of the L-shaped buckle 17. The L-shaped buckle 17 matches the slot 18. The slot 18 is located on one side of the sealing block 14. The inner wall of one side of the connecting hole is provided with a screw hole, a second fixing screw rod 19 is threadedly connected to the inner wall of the screw hole, one end of the second fixing screw rod 19 extends into the connecting hole and is rotatably connected with an arc-shaped pressing block 20, and the outer wall of one side of the L-shaped buckle 17 is provided with an arc-shaped groove matched with the arc-shaped pressing block 20; The outer wall of one side of the mounting box 1 is fixedly connected with a driving motor 22, and the driving motor 22 is fixedly connected with the rotating rod 2 through a shaft coupling; The sliding block 16 is in a T shape, the inner bottom wall of the vertical groove is fixedly connected with a second spring 23, and the other end of the second spring 23 is fixedly connected with the sliding block 16; The inner wall of the connecting hole is fixedly connected with a torsion spring 24, the other end of the torsion spring 24 is fixedly connected with the sealing block 14, and the torsion spring 24 is wound on the outer wall of the rotating shaft; The outer wall of the air bag pipe 5 is fixedly provided with a temperature control exhaust valve, and the four corners of the mounting box 1 are provided with supporting legs; The protective cotton 3 is thick flame-retardant rock wool, and the inner side is provided with a thick polyethylene waterproof film to prevent concrete curing water from seeping in. The thermal insulation layer 4 is a thick rigid polyurethane board, which is integrally formed with the protective cotton 3 at an interval of 30 cm through high-temperature resistant glue points. The air bag pipe 5 is a chloroprene rubber pipe, which is arranged at equal intervals along the outer wall of the thermal insulation layer 4. The air pipe 6 is a PU pipe, one end of which is hot melt connected with the air hole of the air bag pipe 5, and the other end penetrates the interlayer of the thermal insulation layer 4 and the protective cotton 3. The air bag pipe 5 is a hollow pipe provided with an air hole, one end of the air pipe 6 is hot melt connected with the air hole, and the other end penetrates the thermal insulation layer and enters the interlayer. One end of the air bag pipe 5 close to the thermal insulation layer 4 is provided with an air hole at equal intervals, one end of the air pipe 6 is hot melt sealed connected with the air hole, and the other end penetrates into the interlayer of the protective cotton 3 and the thermal insulation layer 4. The protective cotton 3 and the thermal insulation layer 4 are integrally fixed through high-temperature resistant glue points. The tensioning of the drawstring 9 positions the inflation of the air bag pipe 5, supports the interlayer of the protective cotton 3 and the thermal insulation layer 4, avoids the bending, displacement or leakage of the air pipe 6, and ensures that the hot air passes through the air flow channel of the air bag pipe 5 without obstruction. The connecting block 7 is made of ABS engineering plastic by injection molding, and a hot air cavity is formed inside. One side is provided with a connecting hole with a diameter of 60 mm for splicing. The heating fan 8 is a fuel hot air fan, and the air outlet is communicated with the hot air cavity through a silica gel air pipe. The drawstring 9 is a diameter aramid fiber rope and is alternately distributed with the air bag pipe 5, one end of which is wound and fixed on the rotating rod 2, and the other end penetrates the interlayer of the protective cotton 3 and the thermal insulation layer 4. The sliding pipe 10 and the fixed pipe 11 are both seamless steel pipes, and the first spring 13 is a cylindrical coil spring provided with a pre-tightening force. When the rotating rod 2 rotates to wind the rope, the fixed pipe 11 slides along the sliding pipe 10 to compress the first spring 13, and the tensioning of the drawstring 9 is buffered by the elastic force of the first spring 13 to avoid over-tightening. The first fixing screw rod 12 can lock the position of the drawstring 9. The sealing block 14 is a rectangular rubber block, the outer wall of which is vulcanized to fix a thick silica rubber sealing ring 15, and a torsion spring 24 is wound around the rotating shaft. In the natural state, the sealing block 14 is combined with the inner wall of the connecting hole under the action of the torsion spring 24, so as to realize initial sealing. When splicing, the L-shaped buckle 17 of the adjacent device is inserted into the clamping groove 18, the end of the L-shaped buckle 17 slides along the inclined pushing surface of the sealing block 14, the sealing block 14 is rotated and compressed, the torsion spring 24 is compressed, and the connecting holes in the two connecting blocks 7 are communicated. The second fixing screw 19 is tightened to drive the arc-shaped pressing block 20 to be embedded in the arc-shaped groove, so as to realize rigid fixation of the buckle and prevent splicing from loosening. The driving motor 22 is a servo motor and is provided with a speed reducer, is connected with the rotating rod 2 through a shaft coupling, is matched with a torque sensor, and automatically stops when the pulling rope force exceeds a certain force, so as to avoid tearing of the protective cotton 3. The temperature control exhaust valve is installed at the end of the air bag pipe 5 away from the connecting block 7, and the opening temperature is set. When the temperature in the air bag pipe 5 is excessively high due to excessive heating, the temperature control exhaust valve is automatically opened to exhaust air and reduce the pressure in the air bag pipe 5.
[0020] In use, the driving motor 22 is connected with an external driving source through a controller, the mounting box 1 is placed on the support on the top of the pier column through the supporting legs, the protective cotton 3 and the thermal insulation layer 4 are unfolded, the protective cotton 3 and the thermal insulation layer 4 are used to wrap the pier column, the free end of the pulling rope 9 is inserted into the fixed pipe 11, the first fixed screw 12 is driven to rotate into the fixed pipe 11 by the first handle to limit and fix the pulling rope 9, the driving motor 22 is started to drive the rotating rod 2 to rotate, the rotating rod 2 tightens the pulling rope 9, and the protective cotton 3 and the thermal insulation layer 4 are combined with the surface of the pier column until the temperature sensor monitors the tension of the pulling rope 9. If the tension of the pulling rope 9 is excessive, the fixed pipe 11 moves outward in the sliding pipe 10 and stretches the first spring 13, the first spring 13 buffers the tension of the pulling rope 9, the heating fan 8 is started, hot air enters the air bag pipe 5 after being branched in the hot air chamber to make the air bag pipe 5 expand, the hot air enters the interlayer of the protective cotton 3 and the thermal insulation layer 4 through the air pipe 6 to heat the protective cotton 3 and the thermal insulation layer 4, the temperature sensor monitors the temperature, and the heating fan 8 is automatically stopped until the surface of the pier column reaches the required temperature. The heating fan 8 is restarted to heat when the temperature is lower than a certain temperature. The protective cotton 3 is a thick flame-retardant rock wool blanket. Due to the excellent flexibility and ductility of the rock wool blanket, the protective cotton 3 can naturally adhere to irregular parts such as the right-angle corners of the circular pier, the variable cross-section of the square bearing platform, the web plate and the flange plate of the beam body, etc. The thermal insulation layer 4 adopts a thick rigid polyurethane board, which has certain rigidity and light weight characteristics, can provide support after the protective cotton 3 adheres to the surface, avoid local collapse caused by excessive softness of the material, ensure the stability of the structure after adhesion, and after the hot air fan 8 blows hot air, the air bag tube 5 will uniformly expand and actively fill the gaps of irregular structures. For the wrinkle gaps of the pier variable cross-section, the air bag tube 5 can be extruded and filled after expansion, realizing double fixation of flexible adhesion and rigid filling. At the same time, when the pull rope 9 is tightened, the pull rope 9 will uniformly exert tension, so that the composite structure tightly adheres to the irregular surface from multiple points. For the arc-shaped pier, the ring-shaped tightening of the pull rope 9 can form a "hugging" adhesion. If lengthening is required, the connecting blocks 7 of adjacent devices are butt-jointed, the L-shaped buckle 17 is inserted into the connecting hole, the second spring 23 pushes the sliding block 16 and the L-shaped buckle 17 to move downward, the L-shaped buckle 17 moves into the clamping groove 18, the two connecting blocks 7 are spliced, the second fixed screw 19 is screwed downward by using the second handle, the arc-shaped pressing block 20 is pushed to move into the arc-shaped groove, the L-shaped buckle 17 is fixed and limited, and the sealing block 14 is synchronously pushed to rotate away from the L-shaped buckle 17 when the L-shaped buckle 17 moves, the two connecting holes are connected, the sealing splicing is completed; After the construction is completed, the first fixed screw 12 and the second fixed screw 19 are loosened by using the first handle and the second handle, the gas in the air bag tube 5 is released, the drive motor 22 is started in reverse rotation to release the pull rope 9, the device is disassembled and the protective cotton 3 is folded.
[0021] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A bridge construction heat preservation device, comprising a mounting box (1), the inner wall of the mounting box (1) is rotatably connected with a rotating rod (2), and the lower surface of the mounting box (1) is fixedly connected with protective cotton (3) in a symmetrical manner; characterized in that the outer wall of the protective cotton (3) is fixedly connected with a heat preservation layer (4), a plurality of air bag tubes (5) are fixedly connected with the outer wall of one side of the heat preservation layer (4) at equal intervals, air holes are formed in the outer wall of one end of the heat preservation layer (4) at equal intervals and air tubes (6) are fixedly connected with the air holes, the air tubes (6) penetrate into the protective cotton (3), the protective cotton (3) and the heat preservation layer (4) are integrally arranged, and the outer wall of one end of the protective cotton (3), the heat preservation layer (4) and the air bag tube (5) away from the mounting box (1) is fixedly connected with a connecting block (7), the outer wall of the connecting block (7) is fixedly connected with a heating fan (8), and the output end of the heating fan (8) extends to the connecting hole through a wind pipe.
2. A bridge construction heat retaining device according to claim 1, characterized in that: the outer wall of the rotating rod (2) is fixedly connected with a pull rope (9) at equal intervals, the pull rope (9) penetrates the interlayer between the protective cotton (3) and the heat preservation layer (4), the pull rope (9) and the air bag tube (5) are arranged alternately, the outer wall of one end of the mounting box (1) away from the pull rope (9) is fixedly connected with a sliding pipe (10), the inner wall of the sliding pipe (10) is slidably connected with a fixed pipe (11), the pull rope (9) extends into the fixed pipe (11) and is fixed, a screw hole is formed in the outer wall of one end of the fixed pipe (11) and a first fixing screw rod (12) is threadedly connected with the screw hole, the first fixing screw rod (12) abuts against the pull rope (9), the other end of the first fixing screw rod (12) extends out of the fixed pipe (11) and is fixedly connected with a first handle, the inner bottom wall of the sliding pipe (10) is fixedly connected with a first spring (13), and the other end of the first spring (13) is fixedly connected with the fixed pipe (11).
3. The bridge construction heat retaining device according to claim 1, characterized in that: the outer wall of one side of the connecting block (7) penetrates to form a connecting hole, the inner wall of the connecting hole is rotatably connected with a rotating shaft, the outer wall of the rotating shaft is fixedly connected with a sealing block (14), the outer wall of the sealing block (14) is fixedly connected with a sealing ring (15), the sealing ring (15) abuts against the connecting block (7), the outer wall of one end of the sealing block (14) away from the sealing ring (15) is provided with an inclined pushing surface, the inner wall of one side of the connecting block (7) located at the sealing block (14) penetrates to form a vertical groove, the inner wall of the vertical groove is slidably connected with a sliding block (16), the sliding block (16) extends out of the vertical groove and is fixedly connected with an L-shaped buckle (17), a clamping groove (18) is formed in the inner wall of the connecting hole relative to the position of the L-shaped buckle (17), the L-shaped buckle (17) is matched with the clamping groove (18), and the clamping groove (18) is located at one side of the sealing block (14).
4. A bridge construction heat retaining device according to claim 3, characterized in that: The inner wall of one side of the connecting hole is provided with a screw hole, a second fixing screw rod (19) is threadedly connected to the inner wall of the screw hole, one end of the second fixing screw rod (19) extends into the connecting hole and is rotatably connected with an arc-shaped pressing block (20), and the outer wall of one side of the L-shaped buckle (17) is provided with an arc-shaped groove matched with the arc-shaped pressing block (20).
5. The bridge construction heat retaining device according to claim 1, characterized in that: One side of the mounting box (1) is fixedly connected with a driving motor (22), and the driving motor (22) is fixedly connected with the rotating rod (2) through a shaft coupling.
6. The bridge construction heat retaining device according to claim 1, characterized in that: The sliding block (16) is in a T shape, the inner bottom wall of the vertical groove is fixedly connected with a second spring (23), and the other end of the second spring (23) is fixedly connected with the sliding block (16).
7. The bridge construction heat retaining device according to claim 3, characterized in that: The inner wall of the connecting hole is fixedly connected with a torsion spring (24), the other end of the torsion spring (24) is fixedly connected with the sealing block (14), and the torsion spring (24) is wound on the outer wall of the rotating shaft.
8. The bridge construction heat retaining device according to claim 1, characterized in that: The air bag tube (5) is fixedly connected with a temperature control exhaust valve, and the mounting box (1) is provided with supporting legs at four corners.