Corrugated steel web composite box girder bridge and construction technology thereof

Abstract

The application relates to a corrugated steel web combined box girder bridge and a construction process thereof, and relates to the technical field of combined girder bridge construction. The corrugated steel web combined box girder bridge comprises a concrete top plate, corrugated steel webs which are obliquely arranged below the concrete top plate, a concrete bottom plate which is horizontally arranged below the two corrugated steel webs, and the two oblique corrugated steel webs, the concrete top plate and the concrete bottom plate form an internal hollow combined box girder, side guard plates which are vertically arranged at the sides of the concrete top plate, the side guard plates are internally hollow and are provided with an open lower end, a paint coating device which is arranged in the interior of the side guard plate and is used for coating anticorrosive paint on the outer wall of the corrugated steel web, and a lifting device which is arranged in the interior of the side guard plate and is arranged above the paint coating device and is used for lowering the paint coating device to a position opposite to the corrugated steel web. The application has the effect of improving the problem that it is difficult to coat anticorrosive paint on the outer wall of the corrugated steel web.

Description

Technical Field

[0001] This application relates to the technical field of composite beam bridge construction, and in particular to a corrugated steel web composite box girder bridge and its construction process. Background Technology

[0002] Currently, corrugated steel web composite box girder bridges are box girders where corrugated steel plates replace the concrete webs of prestressed concrete box girders. A significant characteristic is the replacement of the 30-80cm thick concrete webs with 8-30mm thick steel plates. Another feature of corrugated steel web prestressed concrete box girders is the use of external cables due to limited space for prestressing tendons in the top and bottom slabs.

[0003] Regarding the aforementioned technologies, the inventors believe that in marine or highly corrosive environments, the outer wall of the corrugated steel web is exposed to the air year after year. After a period of use, the outer wall of the corrugated steel web is likely to be corroded, which can easily cause corrosion and damage to the steel, affecting the structural safety and lifespan of the bridge. Therefore, maintenance personnel need to apply anti-corrosion coating to the outer wall of the corrugated steel web in a timely manner. However, since the corrugated steel web is tilted downwards, maintenance personnel need to be suspended on the outside of the corrugated steel web to achieve the coating, which makes the construction difficult. Summary of the Invention

[0004] To address the challenge of applying anti-corrosion coatings to the outer wall of corrugated steel webs, this application provides a corrugated steel web composite box girder bridge and its construction process.

[0005] The technical solution for a corrugated steel web composite box girder bridge provided in this application is as follows:

[0006] A corrugated steel web composite box girder bridge, comprising:

[0007] Concrete roof slab;

[0008] Corrugated steel web, installed at an angle below the concrete roof slab;

[0009] A concrete base slab is horizontally installed below two corrugated steel webs, and the two inclined corrugated steel webs, the concrete top slab, and the concrete base slab form a hollow composite box girder.

[0010] Side guardrail panels are vertically installed on the side of a concrete roof slab, and the side guardrail panels are hollow inside with an opening at the bottom.

[0011] A painting device, installed inside the side guardrail, is used to coat the outer wall of the corrugated steel web with an anti-corrosion coating.

[0012] A lifting device, installed inside the side guardrail and above the painting device, is used to lower the painting device to a position directly opposite the corrugated steel web.

[0013] Preferably, the painting apparatus includes:

[0014] The lower frame is vertically and slidingly installed inside the side guardrail panel;

[0015] The spraying mechanism is installed between the lowering frame and the side guardrail. It is used to spray anti-corrosion coating on the surface of the corrugated steel web when the lowering frame is lowered to a position directly opposite the corrugated steel web.

[0016] Preferably, the lowering rack includes:

[0017] The upper horizontal bar has vertical slots with sealed bottom ends on the inner walls of both sides of the side guardrail. Both ends of the upper horizontal bar are coaxially provided with sliding anti-detachment rods, which slide within the vertical slots.

[0018] Multiple vertical poles are arranged vertically along the length of the upper horizontal pole, and the spray brush mechanism is installed between the vertical poles and the side guardrail.

[0019] The lower horizontal plate is installed horizontally below multiple vertical bars, and the lower horizontal plate is used to cover the lower opening of the side guardrail.

[0020] Preferably, the lifting device includes:

[0021] The rotating motor is installed inside the side guardrail panel;

[0022] The winding reel is coaxially mounted on the output shaft of the rotating motor.

[0023] A lifting rope is wound around a reel, and one end of the lifting rope is connected to the upper crossbar.

[0024] Preferably, the spray brush mechanism includes:

[0025] The storage unit, installed inside the side guardrail above the lower shelf, is used to store anti-corrosion coatings.

[0026] The spraying assembly is slidably mounted on a vertical rod and is used to spray anti-corrosion coating onto the outer wall of the corrugated steel web.

[0027] The drive assembly, mounted on the lower frame, is used to drive the spraying assembly to move on the vertical rod.

[0028] Preferably, the storage component includes a storage box, the storage box being hollow inside and open at the top;

[0029] The spraying assembly includes:

[0030] A coated plate is provided with multiple sliding cylinders, each sliding cylinder being slidably sleeved on a vertical rod, and the shape of the coated plate is adapted to the shape of the corrugated steel web plate;

[0031] A paint pump is installed on the upper crossbar. The inlet end of the paint pump is connected to the inside of the storage box through a bellows pipe, and the output end of the paint pump is also connected to a bellows pipe.

[0032] The brush bristles are applied to the surface of the coating plate near the corrugated steel web. The coating plate has a through hole, and a liquid guide tube is embedded in the hole. One end of the liquid guide tube opens towards the inside of the brush bristles, and the other end is connected to the bellows tube at the output end of the paint pump.

[0033] Preferably, the drive assembly includes a rodless cylinder, which is mounted on the vertical rod along the length of the vertical rod, and the piston rod of the rodless cylinder is connected to the sliding cylinder.

[0034] Preferably, an abutment offset device is also provided on the concrete base plate and directly below the lowering frame. The abutment offset device is used to automatically offset the tilt angle of the lowering frame to a position consistent with the tilt angle of the corrugated steel web after it abuts against the lower horizontal plate.

[0035] Preferably, the abutment offset device includes:

[0036] An extension plate is horizontally slidably installed inside a concrete base slab, the concrete base slab having a cavity inside, and one end of the extension plate extending into the cavity;

[0037] A reset electric cylinder is installed in the cavity. The piston rod of the reset electric cylinder extends horizontally away from the extension plate, and the piston rod of the reset electric cylinder is connected to one end of the extension plate located in the cavity.

[0038] The battery is installed inside the cavity;

[0039] The first conductive sheet has a groove on the upper surface of the extension plate and directly below the lower horizontal plate for the lower horizontal plate to be inserted. The first conductive sheet is covered on the inner bottom wall of the groove and is electrically connected to the battery.

[0040] The second conductive plate is installed in the groove, and a spring is provided between the second conductive plate and the inner bottom wall of the groove. The spring separates the second conductive plate from the first conductive plate, and the second conductive plate is electrically connected to the reset cylinder.

[0041] An iron sheet is attached to the upper surface of the second conductive sheet. An inner cavity is formed inside the lower end of the vertical rod, and an extension rod is slidably disposed within this cavity. A tension spring is also provided within the cavity to continuously push the extension rod into the cavity. The extension rod is hinged to a lower horizontal plate, and a magnetic suction plate is provided on the surface of the lower horizontal plate to magnetically attract the iron sheet. The magnetic attraction between the magnetic suction plate and the iron sheet is greater than the spring force. The weight of the lower frame is greater than the spring force, the tension spring force is greater than the weight of the lower horizontal plate, and the tension spring force is less than the magnetic attraction between the magnetic suction plate and the iron sheet.

[0042] After the first conductive sheet and the second conductive sheet are attached together and the piston rod of the reset cylinder is extended to its maximum length, the tilt angle of the vertical rod is the same as the tilt angle of the corrugated steel web.

[0043] The construction process for a corrugated steel web composite box girder bridge provided in this application adopts the following technical solution:

[0044] Step 1: First, start the lifting device to hoist the painting device to a position that is horizontally opposite to the corrugated steel web;

[0045] Step 2: Add anti-corrosion paint to the painting device, and the painting device will automatically apply the anti-corrosion paint to the surface of the corrugated steel web.

[0046] Step 3: After the film is applied, retract the painting device back into the side guardrail panel.

[0047] In summary, this application includes at least one of the following beneficial technical effects:

[0048] 1. When it is necessary to coat the outer surface of the corrugated steel web with anti-corrosion coating, first fill the coating device with anti-corrosion coating, then start the lowering device to vertically lower the coating device until the height of the coating device is at the same level as the corrugated steel web. Then start the coating device to directly apply the anti-corrosion coating to the outer wall of the corrugated steel web. With this setup, the coating of anti-corrosion coating on the outer wall of the corrugated steel web can be done manually without the need for workers to be lowered to the predetermined position. Workers can simply stand on the concrete top slab and pour the anti-corrosion coating into the coating device, which greatly reduces the construction difficulty of coating the outer wall of the corrugated steel web with anti-corrosion coating.

[0049] 2. When the paint pump is started, the inlet end of the paint pump generates suction, drawing the anti-corrosion paint in the storage box into the bellows tube, and then into the liquid guide tube along the bellows tube. Finally, it is sprayed out from the end of the liquid guide tube and enters the brush bristles. The end of the liquid guide tube is covered with a perforated cap. The perforated cap prevents the anti-corrosion paint from spraying directly out of the end of the liquid guide tube. Instead, it slowly flows out from the perforated cap and soaks into the brush bristles, so that the brush bristles are wetted with anti-corrosion paint. Finally, the brush bristles are pressed against the outer surface of the corrugated steel web, and the rodless cylinder is activated. The rodless cylinder moves back and forth along the length of the vertical rod, so that the brush bristles also move back and forth on the outer wall surface of the corrugated steel web, so that the anti-corrosion paint is more evenly coated on the outer wall surface of the corrugated steel web. Attached Figure Description

[0050] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0051] Figure 2 This is a partial cross-sectional view of an embodiment of this application;

[0052] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0053] Figure 4 yes Figure 2 Enlarged view of part B in the image;

[0054] Figure 5 This is a front sectional view of an embodiment of this application;

[0055] Figure 6 yes Figure 5 Enlarged view of section C in the image.

[0056] In the diagram: 1. Concrete top slab; 2. Corrugated steel web; 3. Concrete bottom slab; 31. Cavity; 4. Side guardrail; 41. Vertical strip hole; 5. Painting device; 51. Lowering frame; 511. Upper horizontal bar; 5111. Sliding anti-detachment bar; 512. Vertical bar; 5121. Inner cavity; 513. Lower horizontal plate; 5131. Magnetic suction plate; 52. Spraying mechanism; 521. Storage assembly; 5211. Storage box; 522. Spraying assembly; 5221. Coating plate; 52211. Sliding... 52212, Liquid guide tube; 5222, Paint pump; 52221, Organ tube; 5223, Brush bristles; 523, Drive assembly; 5231, Rodless cylinder; 6, Lifting device; 61, Rotary motor; 62, Winding reel; 63, Lifting rope; 7, Abutment offset device; 71, Extension plate; 711, Alignment groove; 72, Reset electric cylinder; 73, Storage battery; 74, First conductive sheet; 75, Second conductive sheet; 76, Iron sheet; 8, Spring; 9, Extension rod; 91, Tension spring. Detailed Implementation

[0057] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0058] A corrugated steel web composite box girder bridge, referring to Figure 1 , 2 The structure includes a concrete top slab 1, corrugated steel webs 2, a concrete bottom slab 3, side guardrails 4, a painting device 5, and a lifting device 6. The concrete top slab 1 serves as the road surface of the composite box girder bridge. The corrugated steel webs 2 are installed obliquely below the concrete top slab 1, meaning that two corrugated steel webs 2 are located below the concrete top slab 1. Both corrugated steel webs 2 are in an oblique state, and they gradually approach each other as they extend obliquely from top to bottom. The concrete bottom slab 3 is installed horizontally below the two corrugated steel webs 2, and the two oblique corrugated steel webs 2, the concrete top slab 1, and the concrete bottom slab 3 form a hollow assembly. The box girder is assembled; the side guardrail 4 is vertically installed on the side of the concrete top slab 1, that is, one is provided on each side of the concrete top slab 1 along the length of the concrete top slab 1. The side guardrail 4 is hollow inside and has an opening at the bottom; the painting device 5 is installed inside the side guardrail and is used to coat the outer wall of the corrugated steel web 2 with anti-corrosion coating; the lifting device 6 is installed inside the side guardrail and above the painting device 5. The lifting device 6 is used to lower the painting device 5 to a position directly opposite the corrugated steel web 2. It is worth noting that "directly opposite" means that the height of the painting device 5 is lowered to the same height as the corrugated steel web 2.

[0059] When it is necessary to coat the outer surface of the corrugated steel web 2 with anti-corrosion coating, first fill the coating device 5 with anti-corrosion coating, then start the lowering device to vertically lower the coating device 5 until the height of the coating device 5 is at the same height as the corrugated steel web 2. Then start the coating device 5 again to directly apply the anti-corrosion coating to the outer wall of the corrugated steel web 2. With this setting, the coating of anti-corrosion coating on the outer wall of the corrugated steel web 2 can be carried out manually without the need for workers to be lowered to the predetermined position. Workers can stand on the surface of the concrete top slab 1 and pour the anti-corrosion coating into the coating device 5, which greatly reduces the construction difficulty of coating the outer wall of the corrugated steel web 2 with anti-corrosion coating.

[0060] like Figure 1 , 2As shown, the painting device 5 includes a lowering frame 51 and a spraying mechanism 52. The lowering frame 51 is vertically slidably installed inside the side guardrail 4. The spraying assembly is installed between the lowering frame 51 and the side guardrail 4, and is used to spray anti-corrosion coating on the surface of the corrugated steel web 2 when the lowering frame 51 is lowered to a position directly opposite the corrugated steel web 2. The lifting device 6 is also used to lift the lowering frame 51, that is, to move the lowering frame 51 out of the side guardrail 4 or to store it inside the side guardrail 4. When the lowering frame 51 is lowered to a position at the same height as the corrugated steel web 2, the spraying mechanism 52 can apply anti-corrosion coating to the outer wall surface of the corrugated steel web 2 without the need for manual coating by workers, which is more efficient and has a lower risk factor.

[0061] Combination Figure 2 , 3 The lowering frame 51 includes an upper horizontal bar 511, a vertical bar 512, and a lower horizontal plate 513. Vertical slots 41 are provided on the inner walls of both sides of the side guardrail 4. The vertical slots 41 have side openings and are sealed at the bottom. Both ends of the upper horizontal bar 511 are coaxially provided with sliding anti-detachment rods 5111, which slide in the vertical slots 41. That is, when the entire lowering frame 51 moves down under the action of gravity, the sliding anti-detachment rods 5111 prevent the upper horizontal bar 511 from completely detaching from the side guardrail 4, so that the lowering frame 51 will not separate from the side guardrail 4. Multiple vertical bars 512 are arranged vertically along the length of the upper horizontal bar 511, and the spray brush mechanism 52 is installed between the vertical bars 512 and the side guardrail 4; the lower horizontal plate 513 is installed horizontally below the multiple vertical bars 512, and the lower horizontal plate 513 is used to cover the lower opening of the side guardrail 4.

[0062] like Figure 2 As shown, the lifting device 6 includes a rotating motor 61, a reel 62, and a lifting rope 63. The rotating motor 61 is installed inside the side guardrail 4 and near the top of the side guardrail 4. Two sets of rotating motors 61 are synchronously installed inside the side guardrail 4, each set being installed on the inner end wall of the side guardrail 4 near the top. The reel 62 is coaxially mounted on the output shaft of the rotating motor 61. The lifting rope 63 is wound around the reel 62, and one end of the lifting rope 63 is connected to the upper crossbar 511.

[0063] After the rotating motor 61 is started, the two sets of rotating motors 61 rotate synchronously, thereby driving the winding wheel 62 to rotate and unwind the lifting rope 63 from the winding wheel 62. At this time, the lowering frame 51 will gradually detach from the side guardrail 4 under the action of gravity, so that the vertical bar 512 and the lower horizontal plate 513 are both outside the side guardrail 4. The spraying mechanism 52 between the vertical bar 512 and the side guardrail 4 can directly correspond to the outer surface of the corrugated steel web 2. The next step is to spray anti-corrosion coating on the outer surface of the corrugated steel web 2 through the spraying mechanism 52.

[0064] Combination Figure 2 The spraying mechanism 52 includes a storage component 521, a spraying component 522, and a drive component 523. The storage component 521 is installed inside the side guardrail 4 above the lower frame 51 and is used to store the anti-corrosion coating. In this embodiment, the storage component 521 includes a storage box 5211, which is hollow inside and open at the top. The upper end of the side guardrail 4 is also open, allowing workers to stand directly on the concrete roof slab 1 and directly pour the anti-corrosion coating into the storage box 5211. The spraying component 522 is slidably mounted on the vertical rod 512 and is used for... The anti-corrosion coating is sprayed onto the outer wall of the corrugated steel web 2. The spraying component 522 is connected to the storage box 5211, meaning that the anti-corrosion coating in the storage box 5211 can be directly introduced into the spraying component 522, allowing the spraying component 522 to directly act on the outer wall of the corrugated steel web 2. The driving component 523 is installed in the side guardrail plate 4 and is used to drive the spraying component 522 to move back and forth on the vertical bar 512. Through the setting of the driving component 523, the spraying component 522 can move along the length direction of the vertical bar 512, so that the spraying component 522 can evenly coat the anti-corrosion coating onto the surface of the corrugated steel web 2.

[0065] like Figure 2 , 4 As shown, the spraying assembly 522 includes a coating plate 5221, a paint pump 5222, and brush bristles 5223. The coating plate 5221 has multiple sliding cylinders 52211, each sliding cylinder 52211 being slidably mounted on a vertical rod 512. The shape of the coating plate 5221 matches the shape of the corrugated steel web 2. The paint pump 5222 is mounted on the upper horizontal rod 511. The inlet end of the paint pump 5222 is connected to the interior of the storage box 5211 via a bellows pipe 52221, and the output end of the paint pump 5222 is also connected to a bellows pipe 52221. The brush bristles 5223 cover the coating plate. On the surface of the coating plate 5221 near the corrugated steel web 2, a hole is formed through the inside of the coating plate 5221, and a liquid guide tube 52212 is embedded in the hole. One end of the liquid guide tube 52212 opens towards the inside of the brush bristles 5223, and the other end is connected to the bellows tube 52221 at the output end of the paint pump 5222. It is worth noting that in this embodiment, multiple holes are arranged sequentially along the length of the coating plate 5221, and a liquid guide tube 52212 is embedded in each hole. The multiple liquid guide tubes 52212 are connected to a main pipe, which is directly connected to the bellows tube 52221 at the inlet end of the paint pump 5222.

[0066] Combination Figure 2The drive assembly 523 includes a rodless cylinder 5231, which is mounted on the vertical rod 512 along the length of the vertical rod 512. The piston rod of the rodless cylinder 5231 is connected to the sliding cylinder 52211.

[0067] When the paint pump 5222 is started, the inlet end of the paint pump 5222 generates suction, drawing the anti-corrosion paint in the storage box 5211 into the bellows tube 52221, and then along the bellows tube 52221 into the liquid guide tube 52212, finally spraying out from the port of the liquid guide tube 52212 and into the brush bristles 5223; the end cap of the liquid guide tube 52212 is equipped with a perforated cap, which prevents the anti-corrosion paint from spraying directly out of the end of the liquid guide tube 52212, but instead slowly sprays it out. The coating flows out from the porous cover and soaks into the bristles 5223, so that the bristles 5223 are wetted with anti-corrosion coating. Finally, the bristles 5223 are pressed against the outer surface of the corrugated steel web 2, and the rodless cylinder 5231 is activated. The rodless cylinder 5231 moves back and forth along the length of the vertical rod 512 with the sliding cylinder 52211, so that the bristles 5223 also move back and forth on the outer wall surface of the corrugated steel web 2, so that the anti-corrosion coating is more evenly applied to the outer wall surface of the corrugated steel web 2.

[0068] Reference Figure 5 , 6An abutment offset device 7 is also provided on the concrete base plate 3 and directly below the lowering frame 51. The abutment offset device 7 is used to automatically offset the tilt angle of the lowering frame 51 to the same position as the tilt angle of the corrugated steel web plate 2 after it abuts against the lower horizontal plate 513. After the lowering frame 51 is offset, the tilt angle of the brush bristles 5223 on the coating plate 5221 can also be consistent with the tilt angle of the corrugated steel web plate 2, which further improves the uniformity of the anti-corrosion coating. It is worth noting that since the upper horizontal bar 511 is provided with sliding anti-detachment rods 5111 at both ends, the upper horizontal bar 511 can rotate, so the entire lowering frame 51 can also be tilted. Specifically, the abutment offset device 7 includes an extension plate 71, a reset cylinder 72, a battery 73, a first conductive plate, a second conductive sheet 75, and an iron sheet 76. The extension plate 71 is horizontally slidably installed in the concrete base plate 3, and a cavity 31 is formed inside the concrete base plate 3. One end of the extension plate 71 extends into the cavity 31. The reset cylinder 72 is installed in the cavity 31, and the piston rod of the reset cylinder 72 extends horizontally away from the extension plate 71, and the piston rod of the reset cylinder 72 and the extension plate 71 are located in the cavity 31. One end is connected; the battery 73 is also installed in the cavity 31. The upper surface of the extension plate 71, located directly below the lower horizontal plate 513, has a corresponding groove 711 for the lower horizontal plate 513 to be inserted. The size of the corresponding groove 711 is adapted to the surface of the lower horizontal plate 513. The first conductive sheet 74 is covered on the inner bottom wall of the corresponding groove 711, and the first conductive sheet 74 is electrically connected to the battery 73 through a wire. The second conductive sheet 75 is installed in the corresponding groove 711, and there is a space between the second conductive sheet 75 and the inner bottom wall of the corresponding groove 711. Spring 8 separates the second conductive sheet 75 from the first conductive sheet 74, and the second conductive sheet 75 is electrically connected to the reset cylinder 72; iron sheet 76 covers the upper surface of the second conductive sheet 75; an inner cavity 5121 is opened inside the lower end of the vertical rod 512, an extension rod 9 is slidably arranged in the inner cavity 5121, and a tension spring 91 is also provided in the inner cavity 5121 to push the extension rod 9 into the inner cavity 5121 continuously; the extension rod 9 is hinged to the lower horizontal plate 513, and the surface of the lower horizontal plate 513 is provided with iron sheet 76 The magnetic suction plate 5131 is magnetically attracted, and the magnetic attraction between the magnetic suction plate 5131 and the iron sheet 76 is greater than the elastic force of the spring 8; the weight of the lower frame 51 is greater than the elastic force of the spring 8, the elastic force of the tension spring 91 is greater than the weight of the lower horizontal plate 513, and the elastic force of the tension spring 91 is less than the magnetic attraction between the magnetic suction plate 5131 and the iron sheet 76; after the first conductive sheet 74 and the second conductive sheet 75 are attached and the piston rod of the reset cylinder 72 is extended to its maximum length, the tilt angle of the vertical rod 512 is the same as the tilt angle of the corrugated steel web 2.

[0069] As the lowering frame 51 slowly moves downwards, the lower horizontal plate 513 also gradually moves downwards. Since the groove 711 and the lower horizontal plate 513 are vertically aligned, the lower horizontal plate 513 will directly adhere to the iron plate 76 above the second conductive plate 75, causing the magnetic plate 5131 and the iron plate 76 to be firmly attracted together. As the lowering frame 51 continues to move downwards, the weight of the entire lowering frame 51 will press against the second conductive plate 75, causing the second conductive plate 75 to move vertically downwards within the groove 711, positioned between the first conductive plate 74 and the second conductive plate 75. When the spring 8 between 5 is compressed, the second conductive sheet 75 is attached to the first conductive sheet 74. At this time, the battery 73 is connected to the reset cylinder 72, and the piston rod of the reset cylinder 72 will extend, pushing the extension plate 71 horizontally into the cavity 31. At this time, the upper horizontal bar 511 of the lower frame 51 remains stationary, while the lower horizontal plate 513 of the lower frame 51 will move. Therefore, the entire lower frame 51 will tilt, and the extension rod 9 will also extend from the inner cavity 5121 to accommodate the movement of the lower horizontal plate 513. The angle between the extension rod and the lower horizontal plate 513 will also change. Until the piston rod of the reset electric cylinder 72 extends to its maximum length in the cavity 31, the tilt angle of the vertical rod 512 is the same as the tilt angle of the corrugated steel web 2, and the tilt angle of the bristles 5223 is the same as the tilt angle of the corrugated steel web 2. The bristles 5223 are attached to the outer wall surface of the corrugated steel web 2, thereby facilitating the effect of the bristles 5223 being fully attached to the outer wall of the corrugated steel web 2.

[0070] After the anti-corrosion coating is applied, to facilitate the storage of the lowering frame 51, hooks can be installed on the upper surface of the lower horizontal plate 513. Workers can then hold a hanging rod on the concrete roof slab 1, lower the rod to hook the hooks, and forcibly detach the magnetic plate 5131 on the lower horizontal plate 513 from the iron sheet 76. At this point, under the tension of the tension spring 91, the lower horizontal plate 513 will actively move towards the vertical rod 512, causing the extension rod 9 to retract a certain distance into the inner cavity 5121. Then, the rotation... The motor 61 slowly raises the lowering frame 51, and the tilted lowering frame 51 gradually becomes vertical and retracts into the side guardrail 4. After the lower horizontal plate 513 is separated from the corresponding groove 711, the second conductive plate 75 will separate from the first conductive plate 74 under the elastic force of the spring 8. At this time, after the reset cylinder 72 is de-energized, it will slowly retract its piston rod, so that the extension plate 71 will partially extend out of the cavity 31 again, that is, the corresponding groove 711 will be directly below the lower horizontal plate 513 again.

[0071] This embodiment also includes a construction process for a corrugated steel web composite box girder bridge, comprising the following steps:

[0072] Step 1: First, start the lifting device 6 to hoist the painting device 5 to a position that is horizontally opposite to the corrugated steel web 2;

[0073] Step 2: Add anti-corrosion coating to the painting device 5, and automatically apply the anti-corrosion coating to the surface of the corrugated steel web 2 through the painting device 5;

[0074] Step 3: After the film is applied, retract the painting device 5 back into the side guardrail panel 4.

[0075] The implementation principle of this application embodiment is as follows: First, the rotating motor 61 is started to lower the lowering frame 51, and the lower horizontal plate 513 falls into the docking groove, allowing the first conductive plate to fit with the second conductive sheet 75. At this time, the reset cylinder 72 is connected to the battery 73 and drives the extension plate 71 to move horizontally into the cavity 31, thereby tilting the coating plate 5221 to the same angle as the corrugated steel web 2. Then, the paint pump 5222 is started to immerse the anti-corrosion coating into the brush bristles 5223, and then the rodless cylinder 5231 is started to make the coating plate 5221 move back and forth on the vertical rod 512, realizing the automatic coating of the corrugated steel web 2.

[0076] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A corrugated steel web composite box girder bridge, characterized in that, include: Concrete roof slab (1); A corrugated steel web (2) is installed at an angle below the concrete top slab (1); The concrete base plate (3) is horizontally installed below the two corrugated steel webs (2), and the two inclined corrugated steel webs (2), the concrete top plate (1) and the concrete base plate (3) form a hollow composite box girder. Side guardrail (4) is vertically installed on the side of the concrete top slab (1). The side guardrail (4) is hollow inside and has an opening at the bottom. A painting device (5) is installed inside the side railing. The painting device (5) is used to coat the outer wall of the corrugated steel web (2) with anti-corrosion coating. The lifting device (6) is installed inside the side guardrail and above the painting device (5) for lowering the painting device (5) to a position facing the corrugated steel web (2).

2. The corrugated steel web composite box girder bridge according to claim 1, characterized in that, The painting device (5) includes: The lower frame (51) is vertically slidably installed inside the side guardrail (4); The spraying mechanism (52) is installed between the lowering frame (51) and the side guardrail (4) and is used to spray anti-corrosion coating on the surface of the corrugated steel web (2) when the lowering frame (51) is lowered to the position directly opposite the corrugated steel web (2).

3. The corrugated steel web composite box girder bridge according to claim 2, characterized in that, The lowering rack (51) includes: The upper horizontal bar (511) has vertical slots (41) with sealed lower ends on the inner walls of both sides of the side guardrail (4). Both ends of the upper horizontal bar (511) are coaxially provided with sliding anti-detachment rods (5111), which slide in the vertical slots (41). There are multiple vertical bars (512) arranged vertically along the length of the upper horizontal bar (511), and the spray brush mechanism (52) is installed between the vertical bars (512) and the side guardrail (4); The lower horizontal plate (513) is installed horizontally below multiple vertical bars (512), and the lower horizontal plate (513) is used to cover the lower opening of the side guardrail (4).

4. The corrugated steel web composite box girder bridge according to claim 3, characterized in that, The lifting device (6) includes: Rotary motor (61) is installed inside the side guardrail panel (4); The reel (62) is coaxially mounted on the output shaft of the rotating motor (61); A lifting rope (63) is wound around a reel (62), and one end of the lifting rope (63) is connected to the upper crossbar (511).

5. The corrugated steel web composite box girder bridge according to claim 3, characterized in that, The spray brush mechanism (52) includes: Storage assembly (521), installed inside the side guardrail (4) above the lower rack (51), is used to store anti-corrosion coating; The spraying assembly (522) is slidably mounted on the vertical rod (512) and is used to spray anti-corrosion coating on the outer wall of the corrugated steel web (2); A drive assembly (523), mounted on a lowering frame (51), is used to drive the spraying assembly (522) to move on a vertical rod (512).

6. The corrugated steel web composite box girder bridge according to claim 5, characterized in that, The storage component (521) includes a storage box (5211), which is hollow inside and open at the top. The spraying assembly (522) includes: A coating plate (5221) is provided with a plurality of sliding cylinders (52211), each sliding cylinder (52211) is slidably sleeved on a vertical rod (512), and the shape of the coating plate (5221) is adapted to the shape of the corrugated steel web plate (2). A paint pump (5222) is installed on the upper crossbar (511). The inlet end of the paint pump (5222) is connected to the inside of the storage box (5211) through a bellows pipe (52221). The output end of the paint pump (5222) is also connected to a bellows pipe (52221). Brush bristles (5223) are applied to the surface of the coating plate (5221) near the corrugated steel web plate (2). The coating plate (5221) has a through hole, and a liquid guide tube (52212) is embedded in the hole. One end of the liquid guide tube (52212) opens towards the inside of the brush bristles (5223), and the other end is connected to the accordion tube (52221) at the output end of the paint pump (5222).

7. The corrugated steel web composite box girder bridge according to claim 6, characterized in that, The drive assembly (523) includes a rodless cylinder (5231), which is mounted on the vertical rod (512) along the length of the vertical rod (512), and the piston rod of the rodless cylinder (5231) is connected to the sliding cylinder (52211).

8. The corrugated steel web composite box girder bridge according to claim 3, characterized in that, An abutment offset device (7) is also provided on the concrete base plate (3) and directly below the lowering frame (51). The abutment offset device (7) is used to automatically offset the tilt angle of the lowering frame (51) to a position consistent with the tilt angle of the corrugated steel web plate (2) after it abuts against the lower horizontal plate (513).

9. The corrugated steel web composite box girder bridge according to claim 8, characterized in that, The abutment offset device (7) includes: An extension plate (71) is horizontally slidably installed in a concrete base plate (3). A cavity (31) is provided inside the concrete base plate (3). One end of the extension plate (71) extends into the cavity (31). A reset electric cylinder (72) is installed in the cavity (31). The piston rod of the reset electric cylinder (72) extends horizontally away from the extension plate (71), and the piston rod of the reset electric cylinder (72) is connected to one end of the extension plate (71) located in the cavity (31). A storage battery (73) is installed inside a cavity (31); The first conductive sheet (74) has a groove (711) on the upper surface of the extension plate (71) and directly below the lower horizontal plate (513) for the lower horizontal plate (513) to be inserted. The first conductive sheet (74) is covered on the inner bottom wall of the groove (711) and is electrically connected to the battery (73). The second conductive sheet (75) is installed in the groove (711), and a spring (8) is provided between the second conductive sheet (75) and the inner bottom wall of the groove (711). The spring (8) separates the second conductive sheet (75) from the first conductive sheet (74), and the second conductive sheet (75) is electrically connected to the reset cylinder (72). An iron sheet (76) is applied to the upper surface of the second conductive sheet (75). An inner cavity (5121) is formed inside the lower end of the vertical rod (512). An extension rod (9) is slidably disposed within the inner cavity (5121). A tension spring (91) is also provided within the inner cavity (5121) to continuously push the extension rod (9) into the inner cavity (5121). The extension rod (9) is hinged to the lower horizontal plate (513). The plate (513) has a magnetic suction plate (5131) on its surface that magnetically attracts the iron sheet (76). The magnetic attraction between the magnetic suction plate (5131) and the iron sheet (76) is greater than the elastic force of the spring (8). The weight of the lower frame (51) is greater than the elastic force of the spring (8), and the elastic force of the tension spring (91) is greater than the weight of the lower horizontal plate (513). The elastic force of the tension spring (91) is less than the magnetic attraction between the magnetic suction plate (5131) and the iron sheet (76). After the first conductive sheet (74) and the second conductive sheet (75) are in contact and the piston rod of the reset cylinder (72) is extended to its maximum length, the tilt angle of the vertical rod (512) is the same as the tilt angle of the corrugated steel web (2).

10. A construction method for a corrugated steel web composite box girder bridge according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: First, start the lifting device (6) and hoist the painting device (5) to a position that is horizontally opposite to the corrugated steel web (2); Step 2: Add anti-corrosion coating to the painting device (5) and apply the anti-corrosion coating to the surface of the corrugated steel web (2) automatically through the painting device (5); Step 3: After the film is applied, retract the painting device (5) back into the side guardrail (4).

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