precast box girder maintenance room

Abstract

The present application relates to a kind of prefabricated box girder maintenance room, including maintenance room, box girder top surface maintenance device and the longitudinal guide rail of conveying box girder to inside maintenance room, the upper longitudinal pivot of being equipped with upper sealing piece, the lower longitudinal pivot of being equipped with lower sealing piece and being fixed with longitudinal water supply pipe are rotatably connected on the two side walls of the transverse of maintenance room, the upper sealing piece can be sealed and abutted on the upper end of the side surface of box girder by rotating upper longitudinal pivot and be separated from the side surface of box girder, the lower sealing piece can be sealed and abutted on the side surface of bottom die by rotating lower longitudinal pivot and be separated from the side surface of bottom die, longitudinal water supply pipe is located between upper longitudinal pivot and lower longitudinal pivot, and longitudinal water supply pipe is equipped with the spray head for spraying water to the side surface of box girder located in maintenance room along longitudinal direction.The present application has the advantage that box girder can be maintained in partition, solves the problem that existing box girder cannot be maintained in partition.

Description

Technical Field

[0001] This invention relates to the field of road and bridge construction technology, and in particular to a curing chamber for precast box girders. Background Technology

[0002] During road construction, bridges are sometimes necessary. One method of bridge construction involves building piers and abutments, installing crossbeams on the piers, rapidly prefabricating box girders between the crossbeams, and then casting reinforced concrete onto the box girders. The box girder prefabrication process involves building a steel reinforcement cage inside the outer formwork of the box girder, placing the box girder core mold inside the steel reinforcement cage, pouring concrete, and after the concrete has solidified, removing the side and end formwork of the outer formwork for curing. After curing, the core mold is then removed. The existing prefabricated box girder manufacturing process has the following shortcomings: it cannot perform zoned curing of the box girder; the side and end formwork can only be removed for geotextile covering after complete curing, requiring multiple curing steps to prevent moisture loss, which is time-consuming and prolongs the process; and removing the box girder core mold is laborious. Summary of the Invention

[0003] The first objective of this invention is to provide a precast box girder curing chamber capable of performing zoned curing of box girders, thus solving the problem that existing box girders cannot be cured in zones.

[0004] The second objective of this invention is to further solve the problem that box girder curing can only be carried out after the box girder has cured, by providing a precast box girder curing chamber that allows curing without the need for box girder curing and has good plastic film tension.

[0005] The above technical problems are solved by the following technical solution: A precast box girder curing chamber, comprising a curing chamber, characterized in that it further comprises a box girder top surface curing device, a longitudinal guide rail for conveying the box girder into the curing chamber, a bottom template supporting the box girder is supported on the longitudinal guide rail by a bottom template traveling wheel, the cast box girder is located on the bottom plate in a longitudinally extending state, an upper longitudinal rotating shaft is rotatably connected to the two transverse side walls of the curing chamber, a lower longitudinal rotating shaft is rotatably connected to the upper longitudinal rotating shaft and a longitudinal water supply pipe is fixedly connected thereto, the upper longitudinal rotating shaft is provided with an upper sealing plate extending longitudinally, and the upper longitudinal rotating shaft is rotated... The upper sealing plate can be separated from the upper end of the side surface of the box girder located in the curing chamber. A lower sealing plate extending longitudinally is provided on the lower longitudinal rotating shaft. Rotating the lower longitudinal rotating shaft allows the lower sealing plate to be separated from the side surface of the bottom formwork located in the curing chamber. A longitudinal water supply pipe is located between the upper and lower longitudinal rotating shafts, and the longitudinal water supply pipe is equipped with spray nozzles distributed longitudinally for spraying water onto the side surface of the box girder located in the curing chamber. In use, after the bottom formwork carrying the box girder enters the set position in the curing chamber, the upper and lower longitudinal rotating shafts rotate, causing the upper and lower sealing plates to seal the upper and lower sides of the box girder, thus sealing the side surface of the box girder. Then, water is supplied from the longitudinal water supply pipe and sprayed from the spray nozzles onto the side surface of the box girder for curing. The top surface of the box girder is cured using a box girder top surface curing device. This technical solution allows for zoned maintenance of the top surface and two sides of the box girder to meet the different maintenance needs of different parts.

[0006] Preferably, the box girder top surface curing device includes a suspension base frame suspended above the track via a suspension frame. The suspension base frame is equipped with a crossbar, several rake teeth connected to the crossbar and distributed laterally, with their lower ends extending downwards beyond the crossbar, and a rake tooth lifting mechanism that drives the crossbar to raise and lower, causing the rake teeth to extend downwards beyond the suspension base frame. The suspension base frame also includes a film covering mechanism, a watering mechanism, a geotextile laying mechanism, and a geotextile covering mechanism located in front of the crossbar, and a laterally extending compaction roller located in front of the suspension base frame and connected to it via a swing arm. In use, the plastic film is supported on the film covering mechanism, the geotextile is supported on the geotextile covering mechanism, and the same number of cable rolls as the rake teeth are supported on the cable laying mechanism. The box girder prefabricated outside the curing chamber initially sets. After the box girder is solidified, the side templates of the outer formwork are removed and pushed into the curing chamber. When the box girder passes under the suspended base frame, the rake tooth lifting mechanism drives the crossbar to descend until the rake teeth are inserted into the top surface of the box girder to a set depth. This fixes one end of the plastic film carried on the covering mechanism, one end of the geotextile carried on the covering mechanism, and one end of the cable roll carried on the laying mechanism to one end of the length direction of the box girder. The cable is distributed laterally and is located above the plastic film. The cable and the rake teeth are aligned one-to-one. The rolling roller presses on the cable and is located below the geotextile. The rake teeth form grooves on the box girder. The plastic film is covered on the box girder. The cable is pressed into the groove by the rolling roller through the plastic film. Water is sprayed onto the plastic film by the watering mechanism. The geotextile is covered on the plastic film and covers the cable.

[0007] This technical solution allows for the simultaneous completion of roughening, membrane covering, cable threading, water spraying, and geotextile covering during the curing of the box girder's upper surface. This shortens the curing process and improves efficiency. It reduces surface unevenness caused by manual paving or the lack of membrane covering in certain areas, thus minimizing moisture loss and reducing the risk of surface loosening and cracking due to strong winds. The cables can be easily pressed into the trench. Pressing the cables into the trench helps to tighten the plastic membrane, reducing moisture loss and saving water during curing. Applying the membrane first allows the outer formwork to be removed and the geotextile covered after the concrete has initially set, saving time waiting for curing.

[0008] Preferably, the film covering mechanism includes a film roll rotatably connected to a suspension base and a film unloading motor that drives the film roll to rotate; the film roll is detachably connected to the suspension base. This provides a specific technical solution for the film covering mechanism.

[0009] Preferably, the suspension base has a first column and a second column arranged opposite to each other. The film roll is located between the first and second columns, and the film-dispensing motor is located outside the first column. The first column has a shaft mounting hole, and an outer flange is bolted to the outside of the shaft mounting hole. The housing of the film-dispensing motor is connected to the outer flange. The power output shaft of the film-dispensing motor passes through the shaft mounting hole and is fitted with a sleeve. The sleeve and the power output shaft of the film-dispensing motor rotate synchronously through a key and keyway. One end of the film roll is supported in an inner flange by a drive-side bearing. The inner flange is fixed to the first column by bolts. One end of the film roll and the sleeve rotate synchronously through a key and keyway. The other end of the film roll is supported in an opening slot of the second column by a connecting seat bearing. A clamping block for clamping the connecting seat bearing is detachably connected in the opening slot. This technical solution allows for convenient and quick replacement of the plastic film. The connection is reliable.

[0010] Preferably, the suspension base is provided with a first column and a second column arranged opposite to each other. The film covering mechanism includes a film roll rotatably connected at both ends to the first and second column. The geotextile covering mechanism includes a geotextile storage box and two traction rollers. The two ends of the two traction rollers are rotatably connected to the first and second column. A first guide roller is provided at the upper end of the geotextile storage box. A second guide roller is provided between the first guide roller and the traction roller. The height of the first guide roller is greater than the height of the second guide roller. The traction roller is located above the film roll and is connected to a traction motor. In use, the geotextile passes sequentially around the upper side of the first guide roller and the lower side of the second guide roller and then passes between the two traction rollers. Due to the large thickness of the geotextile, the winding method on the shaft results in a large roll volume and weight, placing high demands on the shaft and occupying a large amount of space. This preferred method uses a storage box, where the geotextile is folded and placed, ensuring convenient unwinding and easy loading. This technical solution can tighten the geotextile, which is beneficial for flattening and laying.

[0011] Preferably, the watering mechanism includes a horizontal water distribution pipe connected to the suspension base, a water storage tank, and a water pump that delivers water from the water storage tank to the horizontal water distribution pipe. The horizontal water distribution pipe is equipped with several forward-spraying nozzles. In use, water is sprayed by driving the water pump.

[0012] Preferably, the cable laying mechanism includes several cable reel support frames distributed laterally. Each support frame includes a connecting block connected to the suspension base at one end, a horizontal shaft head connected to the connecting block at the other end, a blocking pin passing through the other end of the horizontal shaft head, and a guide ring connected to the connecting block. In use, the cable reel, formed by winding the cable, is placed on the horizontal shaft head. The connecting block and the blocking pin block both ends of the cable reel. During use, the outer end of the cable wound from the reel passes through the guide ring and is connected to the box girder. This allows for independent cable laying in each trench.

[0013] Preferably, the suspension base has two horizontally distributed columns, each with a vertical groove on its inner side. The two ends of the crossbar are slidably connected to these vertical grooves. The upper sections of the two columns are connected together by a crossbeam. The rake tooth lifting mechanism includes a vertical guide rod whose lower end is connected to the crossbar, a vertical lead screw whose lower end is threaded to the crossbar and passes through it, and a lifting motor that drives the lead screw to rotate. The upper end of the vertical guide rod passes through the crossbeam, and the lifting motor is fixed to the crossbeam. This design is compact and prevents the rake teeth from interfering with other operations when roughening is not required.

[0014] Preferably, the cable is a heating wire. It can heat and insulate the water between the plastic film and the geotextile, thus saving energy during heating.

[0015] Preferably, the melting point of the plastic film is higher than the set temperature but lower than 100°C. After curing, the plastic film is melted by heating, making it easy to remove.

[0016] The beneficial effects of this invention are: geotextile can be covered for curing without curing, which can shorten the curing time; the plastic film has good tension; it can reduce the water used during curing; it saves energy during curing and heat preservation; the plastic film is easy to remove; it can complete the surface roughening and moisturizing curing of the box girder in one go, shortening the curing process and improving the curing efficiency; the connection between the box girder and the cast-in-place bridge deck is reliable; and it can perform zoned curing. Attached Figure Description

[0017] Figure 1 This is a rear view schematic diagram of the present invention;

[0018] Figure 2 This is a side view schematic diagram of the box girder top surface curing device;

[0019] Figure 3 This is a front view schematic diagram of the box girder top surface curing device;

[0020] Figure 4 for Figure 3 A magnified view of a portion of point B;

[0021] Figure 5 A schematic diagram of the relevant structures for roughening the top surface of a box girder using a curing device.

[0022] Figure 6 for Figure 5 A magnified view of a portion at point C;

[0023] Figure 7 This is a schematic diagram showing the connection between the film roll and the suspension base;

[0024] Figure 8 This is a schematic diagram illustrating the principle of geotextile unwinding in this invention;

[0025] Figure 9 for Figure 1 A magnified view of a portion at point D;

[0026] Figure 10 This is a side view magnified schematic diagram of the present invention.

[0027] In the diagram: 1. Bottom formwork plate; 2. Curing chamber; 3. Longitudinal track; 4. Bottom formwork traveling wheel; 5. Box girder top surface curing device; 6. Suspension frame; 7. Suspension base frame; 8. Horizontal bar; 9. Rake teeth; 10. Pointed head; 11. Cutting edge; 48. Column; 12. Vertical chute; 13. Horizontal beam; 14. Vertical guide rod; 15. Vertical screw rod; 16. Lifting motor; 17. Swing arm; 18. Roller; 19. Film roll; 20. Film unloading motor; 21. First column head; 22. Second column head; 23. Outer flange; 24. Sleeve; 25. Active side bearing; 26. Inner flange; 27. Connecting seat bearing; 28. Pressing block; 29. ​​Film roller; 50. Geotextile storage box; 30. Traction roller; 31. 32. Guide roller 1, 33. Second guide roller 2, 34. Drive gear 3, 35. Driven gear 3, 36. Transverse water distribution pipe 3, 37. Water tank 3, 38. Water pump 3, 39. Water outlet 3, 40. Wire roll support frame 4, 41. Horizontal suspension rod 4, 42. Connecting block 4, 43. Horizontal shaft head 4, 44. Barrier pin 4, 45. Guide ring 4, 46. Wire roll 4, 47. Traction motor 4, 119. Film roll 119, Upper longitudinal shaft 49, Lower longitudinal shaft 50, Longitudinal water supply pipe 51, Upper sealing plate 52, Lower sealing plate 53, Spray head 54, Trench 112, Plastic film 113, Cable 114, Water 115, Geotextile 116, Water-blocking flange 117, Film roll 119, Box girder 120. Detailed Implementation

[0028] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0029] See Figures 1 to 10A precast box girder curing chamber includes a curing chamber 121, a box girder top surface curing device 6, and a longitudinal track 4 extending from the front end into the curing chamber. In use, the bottom formwork 1 is supported on the longitudinal track by bottom formwork traveling wheels 5. The cast box girder 120 is positioned longitudinally on the bottom plate, and the box girder top surface curing device is located at the entrance end of the curing chamber. The box girder top surface curing device includes a suspension base 8 suspended above the track by a suspension frame 7. The suspension base 8 is provided with a crossbar 9, several rake teeth 10 connected to the crossbar and distributed laterally with their lower ends extending downwards beyond the crossbar, and a rake tooth lifting mechanism that drives the crossbar to rise and fall so that the rake teeth extend downwards beyond the suspension base 8. The lower end of the rake teeth has a pointed tip 11, and the front side has a vertically extending cutting edge 48. The suspension base has two horizontally distributed columns 12, with vertical grooves 13 on the inner side of each column. The two ends of a crossbar are slidably connected to the grooves. The upper sections of the two columns are connected together by a crossbeam 14. The rake tooth lifting mechanism includes a vertical guide rod 15 connected to the crossbeam at its lower end, a vertical lead screw 16 threaded to the crossbeam at its lower end and passing through the crossbeam, and a lifting motor 17 that drives the lead screw to rotate. The upper end of the vertical guide rod passes through the crossbeam, and the upper end of the vertical lead screw is rotatably connected to the crossbeam. The lifting motor is fixed to the crossbeam. The suspension base also includes a film covering mechanism, a watering mechanism, a line laying mechanism, a geotextile covering mechanism located behind the crossbar, and a compaction roller 19 located in front of the suspension base and connected to it via a swing arm 18. The compaction roller extends laterally. The film covering mechanism includes a film roll 20 rotatably connected to the suspension base and a film unloading motor 21 that drives the film roll to rotate. The film roll and the suspension base are detachably configured. Specifically, the suspension base is provided with a first column head 22 and a second column head 23 arranged opposite to each other. The film roll is mounted between the first column head and the second column head. The film feeding motor is located outside the first column head. The first column head is provided with a shaft mounting hole. An outer flange 24 is bolted to the outside of the shaft mounting hole. The housing of the film feeding motor is connected to the outer flange. The power output shaft of the film feeding motor passes through the shaft mounting hole and is fitted with a sleeve 25. The sleeve and the power output shaft of the film feeding motor rotate synchronously through a key and keyway. One end of the film roll is supported by an inner flange 27 through an active side bearing 26. The inner flange is also fixed to the first column head by bolts. One end of the film roll and the sleeve also rotate synchronously through a key and keyway. The other end of the film roll is supported in the opening slot of the second column head through a connecting seat bearing 28. A clamping block 29 for clamping the connecting seat bearing is detachably connected in the opening slot. Before assembling the film roll, the inner flange is integrally assembled with one end of the film roll, and the other end of the film roll is assembled with the connecting bearing. When assembling the film roll, one end of the film roll is inserted into the sleeve, and then the inner flange is bolted to the first mounting beam. At the same time, the connecting bearing on the other end of the film roll is inserted into the opening groove, and the bolted removable clamping block is pressed onto the second mounting beam to tighten the connecting bearing.When the film roll needs to be removed for replacement, first remove the removable clamping block and inner flange, then move the film roll axially to separate it from the sleeve, and then remove the film roll. Before installation, the film roll is wound with film 50. The geotextile covering mechanism includes a geotextile storage box 30 and two traction rollers 31. In use, the geotextile is pulled by the two traction rollers. The two ends of the two traction rollers are rotatably connected to the first column and the second column. The upper end of the geotextile storage box is provided with a first guide roller 32, and a second guide roller 33 is provided between the first guide roller and the traction roller. The height of the first guide roller is greater than the height of the second guide roller. The geotextile passes around the upper side of the first guide roller and the lower side of the second guide roller in sequence and then passes between the two traction rollers. The traction roller is located above the film roll. One end of one traction roller is connected to the traction motor 47, and the other end is provided with a drive gear 34. The drive gear meshes with the driven gear 35 connected to the other traction roller. The geotextile storage box has a rectangular structure, with the geotextile inside folded and aligned. The watering mechanism includes a transverse water distribution pipe 36 connected to the suspension base, a water storage tank 37, and a water pump 38 that transports water from the water storage tank to the transverse water distribution pipe. The transverse water distribution pipe is equipped with several forward-spraying nozzles 39. The cable laying mechanism includes several cable reel support frames 40, which are distributed transversely. Each cable reel support frame includes a connecting block 42 connected at one end to a transverse suspension rod 41 on the suspension base, a transverse shaft head 43 connected at one end to the connecting block, a blocking pin 44 passing through the other end of the transverse shaft head, and a guide ring 45 connected to the connecting block. In use, the cable reel 46 wound with cable is fitted onto the transverse shaft head, with the connecting block and blocking pin blocking both ends of the cable reel, and the cable end on the cable reel passing through the guide ring.

[0030] When using the box girder top surface curing device, the film roll 119 is installed on the film roll shaft, the water tank is filled with water, the geotextile is placed in the geotextile storage box, and the geotextile passes around the upper side of the first guide roller, the lower side of the second guide roller and between the two traction rollers in sequence. The cable roll with the same number of rake teeth is carried on the cable laying mechanism.

[0031] After the box girder is hinged and initially set outside the curing chamber, it is pushed into the curing chamber through the bottom template for curing. When the box girder passes under the suspended base frame, the rake tooth lifting mechanism drives the crossbar to descend until the rake teeth insert into the top surface of the box girder to a set depth. This fixes one end of the plastic film supported by the covering mechanism, one end of the geotextile supported by the geotextile covering mechanism, and one end of the cable roll supported by the cable laying mechanism at the front end along the length of the box girder. The cable is located above the plastic film, and the cable is aligned one-to-one with the rake teeth. The rolling roller presses on the cable and is located below the geotextile. The rake teeth form grooves on the box girder, and the plastic film is covered onto the box girder. The cable is pressed into the groove by the rolling roller through the plastic film. Water is sprayed onto the plastic film by the watering mechanism, and the geotextile covers the plastic film and the cable. The cable is an electric heating wire. During curing in the curing chamber, the cable is electrically heated to heat the water on the plastic film to maintain the set temperature. After curing is completed, remove the geotextile and then heat it to the set temperature until the plastic film melts.

[0032] The curing chamber has an upper longitudinal shaft 49 rotatably connected to each of its two transverse side walls, a lower longitudinal shaft 50 rotatably connected to each, and a longitudinal water supply pipe 51 fixedly connected to each. The upper longitudinal shaft has an upper sealing plate 52 extending longitudinally. Rotating the upper longitudinal shaft allows the upper sealing plate to seal against the upper end of the side surface of the box girder located in the curing chamber and disengage from the side surface of the box girder located in the curing chamber. The lower longitudinal shaft has a lower sealing plate 53 extending longitudinally. Rotating the lower longitudinal shaft allows the lower sealing plate to seal against the side surface of the bottom formwork located in the curing chamber and disengage from the side surface of the bottom formwork located in the curing chamber. During curing of the box girder in the curing chamber, when the box girder reaches its designated receiving position, the upper and lower sealing plates abut against adjacent side surfaces. The longitudinal water supply pipe is located between the upper and lower longitudinal shafts and has spray nozzles 54 distributed longitudinally for spraying water onto the side surface of the box girder located in the curing chamber. Water is sprayed onto the sides of the box girder through sprinkler heads for curing.

[0033] The box girder maintenance process includes: A) Top surface maintenance; B) Side surface maintenance. A includes: A1) Roughening: Forming several longitudinally extending grooves 112 on the partially set but not yet cured surface of the box girder, with the grooves parallel to each other; A2) Covering with film: Covering the upper surface of the box girder with plastic film 113; A3) Tensioning: Inserting several cables 114 through the plastic film into the grooves, with the cables extending along the direction of the grooves, and tensioning the plastic film during the insertion of the cables into the grooves; A4) Watering: Pouring water 115 onto the plastic film; A5) Covering with geotextile: Covering the box girder with geotextile 116 on top of the plastic film. A1 to A5 are completed when the box girder passes under the suspension base; water-retaining flanges 117 are provided on both sides of the upper surface of the box girder perpendicular to the extension direction of the trench, and the water in A4 submerges the part of the box girder located between the water-retaining flanges; A6, heat preservation: the cable is energized to heat the water on the plastic film and keep it constant at the set temperature; A7, removal of the covering layer: the geotextile is collected again for reuse, the water on the plastic film is evaporated, and the cable is energized until the temperature generated by the cable is higher than the melting point of the plastic film, thereby melting and burning the plastic film; B, as well as A6 and A7, are completed in the curing room.

Claims

1. A curing chamber for precast box girders, comprising a curing chamber, characterized in that, It also includes a box girder top surface curing device, a longitudinal guide rail for transporting the box girder to the curing chamber, a bottom formwork supporting the box girder via bottom formwork traveling wheels on the longitudinal guide rail, and the cast box girder positioned longitudinally on the bottom plate. The curing chamber has an upper longitudinal shaft rotatably connected to each of its two transverse side walls, a lower longitudinal shaft rotatably connected to each, and a longitudinal water supply pipe fixedly connected thereto. The upper longitudinal shaft has an upper sealing plate extending longitudinally; rotating the upper longitudinal shaft allows the upper sealing plate to seal against the upper end of the side surface of the box girder located in the curing chamber and disengage from the side surface of the box girder located in the curing chamber. The lower longitudinal shaft has a lower sealing plate extending longitudinally; rotating the lower longitudinal shaft allows the lower sealing plate to seal against the upper end of the side surface of the box girder located in the curing chamber and disengage from the side surface of the box girder located in the curing chamber. The sealing strip abuts against the side surface of the bottom formwork located in the curing chamber and detaches from the side surface of the bottom formwork located in the curing chamber. The longitudinal water supply pipe is located between the upper longitudinal rotating shaft and the lower longitudinal rotating shaft. The longitudinal water supply pipe is equipped with spray heads distributed longitudinally for spraying water onto the side surface of the box girder located in the curing chamber. The box girder top surface curing device includes a suspension base frame suspended above the track by a suspension frame. The suspension base frame is equipped with a crossbar, several rake teeth connected to the crossbar and distributed laterally with their lower ends extending downward beyond the crossbar, and a rake tooth lifting mechanism that drives the crossbar to lift and lower, causing the rake teeth to extend downward beyond the suspension base frame. The suspension base frame is also equipped with a covering film mechanism, a watering mechanism, a line laying mechanism, and a geotextile covering mechanism located in front of the crossbar. A rolling roller extending laterally in front of the suspension base is connected to the suspension base via a swing arm. In use, the plastic film is supported on the film covering mechanism, the geotextile on the geotextile covering mechanism, and the cable rolls with the same number of rake teeth are supported on the cable laying mechanism. When the box girder passes under the suspension base, the rake tooth lifting mechanism drives the crossbar to descend until the rake teeth insert into the top surface of the box girder to a set depth. This fixes one end of the plastic film supported on the film covering mechanism, one end of the geotextile supported on the geotextile covering mechanism, and one end of the cable rolls supported on the cable laying mechanism to one end of the box girder along its length. The cables are distributed laterally, positioned above the plastic film, and aligned one-to-one with the rake teeth. The rolling roller presses on the cables and is positioned below the geotextile. The rake teeth... Grooves are formed on the box girder, and a plastic film is covered on the box girder. Cables are pressed into the grooves by rollers through the plastic film. Water is sprayed onto the plastic film by a watering mechanism. Geotextile is covered on the plastic film and covers the cables. The suspension base is equipped with two horizontally distributed columns. The inner side of the columns is provided with vertical grooves. The two ends of the crossbar are slidably connected to the vertical grooves. The upper sections of the two columns are connected together by a crossbeam. The rake tooth lifting mechanism includes a vertical guide rod whose lower end is connected to the crossbar, a vertical screw rod whose lower end is threaded to the crossbar and passes through the crossbar, and a lifting motor that drives the screw rod to rotate. The upper end of the vertical guide rod passes through the crossbeam, and the lifting motor is fixed to the crossbeam.

2. The precast box girder curing chamber according to claim 1, characterized in that, The film covering mechanism includes a film roll rotatably connected to a suspension base and a film unloading motor that drives the film roll to rotate. The film roll is detachably connected to the suspension base.

3. The precast box girder curing chamber according to claim 2, characterized in that, The suspension base is equipped with a first column and a second column arranged opposite to each other. The film roll is located between the first column and the second column. The film feeding motor is located outside the first column. The first column has a shaft mounting hole. An outer flange is bolted to the outside of the shaft mounting hole. The housing of the film feeding motor is connected to the outer flange. The power output shaft of the film feeding motor passes through the shaft mounting hole and is fitted with a sleeve. The sleeve and the power output shaft of the film feeding motor rotate synchronously through a key and keyway. One end of the film roll is supported in the inner flange by the active side bearing. The inner flange is fixed to the first column by bolts. One end of the film roll and the sleeve rotate synchronously through a key and keyway. The other end of the film roll is supported in the opening slot of the second column by the connecting seat bearing. A clamping block for clamping the connecting seat bearing is detachably connected in the opening slot.

4. The precast box girder curing chamber according to claim 1, characterized in that, The suspension base is provided with a first column and a second column arranged opposite to each other. The film covering mechanism includes a film roll that is rotatably connected at both ends to the first column and the second column. The geotextile covering mechanism includes a geotextile storage box and two traction rollers. The two ends of the two traction rollers are rotatably connected to the first column and the second column. A first guide roller is provided at the upper end of the geotextile storage box. A second guide roller is provided between the first guide roller and the traction roller. The height of the first guide roller is greater than the height of the second guide roller. The traction roller is located above the film roll and is connected to a traction motor. In use, the geotextile passes around the upper side of the first guide roller and the lower side of the second guide roller in sequence and then passes between the two traction rollers.

5. The precast box girder curing chamber according to claim 1, 2, 3, or 4, characterized in that, The watering mechanism includes a horizontal water distribution pipe connected to the suspension base, a water storage tank, and a water pump that transports water from the water storage tank to the horizontal water distribution pipe. The horizontal water distribution pipe is equipped with several water nozzles that spray forward.

6. The precast box girder curing chamber according to claim 1, 2, 3, or 4, characterized in that, The cable laying mechanism includes several cable reel support frames distributed laterally. Each cable reel support frame includes a connecting block connected to the suspension base at one end, a horizontal shaft head connected to the connecting block at the other end, a blocking pin passing through the other end of the horizontal shaft head, and a guide ring connected to the connecting block. In use, the cable reel, formed by winding a cable, is sleeved on the horizontal shaft head. The connecting block and the blocking pin block both ends of the cable reel. In use, the outer end of the cable wound out of the cable reel passes through the guide ring and is connected to the box girder.

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