A curing method for the beam body of precast box girders for high-speed railways

Abstract

This application relates to the technical field of maintenance or repair of railway track structure components, and specifically discloses a method for curing the body of a precast box girder for high-speed railways. The curing method for the side of the box girder body mainly includes: spraying the side of the box girder body with a first spray head; obtaining an image covering the side area of the box girder body, identifying the dry areas in the image, calculating the coordinates of the dry areas and the area of the dry areas; controlling the second spray head to move to the target coordinates along a path; and controlling the second spray head to spray and treat when the second spray head moves to the target coordinates so as to moisten the dry areas. Since this application uses a first spray head to spray and treat the side of the box girder body, monitors and identifies the dry areas in real time, and timely controls the second spray head to move to and infiltrate the dry areas, it can improve the utilization efficiency of water resources, effectively avoid problems with the quality of the box girder body caused by drying, such as cracking and warping, and ensure the efficient operation of the entire curing process.

Description

Technical Field

[0001] The present application relates to the technical field of maintenance or repair of railway track structure components, and in particular to a method for maintaining a prefabricated box girder for a high-speed railway. Background Art

[0002] The box girder is an important component of the high-speed railway bridge. Its quality and condition directly affect the safety and durability of the bridge. The concrete material needs to maintain appropriate humidity during the hardening process, and the impregnation treatment can form a protective layer on the surface of the box girder to resist the invasion of the external environment and extend the service life of the box girder. In addition, the moist concrete surface can effectively prevent moisture from entering the interior, reducing internal erosion and steel corrosion caused by moisture penetration.

[0003] The impregnation treatment of box girders is an important measure to ensure their structural integrity and extend their service life. Due to the large mass of box girders and their inconvenience in moving, the current impregnation treatment is mostly carried out by spraying the box girders to achieve the purpose of maintenance. However, since box girders are generally large, even small-span box girders generally have a span of 10 to 30 meters. During the spraying process, it is inevitable that some areas are not impregnated due to nozzle blockage, damage, insufficient water pressure and other reasons, and dry areas are prone to shrinkage cracks. These cracks not only affect the surface appearance, but more importantly, they may penetrate deep into the interior and weaken the overall structural strength of the box girder. The microcracks and pores on the surface of the dry area are more susceptible to environmental erosion, such as rainwater infiltration, freeze-thaw cycles, etc. These factors will accelerate the aging of concrete and the corrosion of steel bars, significantly reducing the durability of the box girder. The box girder may be partially damaged or collapsed during long-term use, forming a safety hazard, especially under heavy loads or extreme weather conditions. These hazards may cause serious safety accidents. Summary of the invention

[0004] The present application provides a method for maintaining prefabricated box girders for high-speed railways, thereby solving the problem in the prior art that some areas of the box girders are inevitably not wetted during the spraying process due to nozzle blockage, damage, insufficient water pressure, etc. The method monitors the dryness of the box girder body in real time and wets it in time, thereby ensuring that the dry areas on the sides of the girder body can be wetted in time and fully, avoiding quality problems of the girder body caused by drying, such as cracking, warping, etc., thereby greatly improving product quality.

[0005] The present application provides a method for maintaining a prefabricated box girder for a high-speed railway, including a method for maintaining the side surface, the upper surface, and the lower surface of the girder. The method for maintaining the side surface of the girder comprises the following steps: using a first spray head to spray the side surface of the box girder; obtaining an image covering the side surface area of ​​the box girder, identifying a dry area in the image, and calculating the coordinates and area of ​​the dry area; obtaining the coordinates (x p, y p ), obtain the target coordinates (x p , y p ) of the second sprinkler head facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, obtain the current position of the second sprinkler head, and plan the path for the second sprinkler head to move towards the target coordinates (x m , y m ); control the sprinkler head to move to the corresponding coordinates according to the path; when the sprinkler head reaches the corresponding coordinates, control the sprinkler head to spray for treatment to moisten the dry area.

[0006] Further, identifying the dry area in the image and recording the coordinates of the dry area specifically includes: preprocessing the image, including grayscale conversion and filtering for noise reduction; using the threshold segmentation method to segment the grayscale image into a dry area and a wet area to detect the edge of the dry area and highlight the contour of the dry area; using the contour detection algorithm to find the contour of the dry area and filter out the non-dry areas; calculating the pixel coordinates and area of the center point of each dry area.

[0007] Further, obtaining the target coordinates (x p , y p ) of the second sprinkler head facing the center point coordinates (x m , y m ) in the preset motion range coordinate system specifically includes: determining the range of the pixel coordinate system, denoted as (0, 0) to (W p , H p ), where W p and H p respectively represent the width and height of the image; determining the range of the preset motion range coordinate system, denoted as (0, 0) to (W m , H m ), where W m and H m respectively represent the width and height of the motion range;

[0008] Calculate the conversion ratio from pixel coordinates to motion range coordinates, including the horizontal ratio S x and the vertical ratio S y , Calculate the target coordinates (x p , y p ) of the second sprinkler head facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, x m = x p × S x , y m = y p × S y .

[0009] Further, the path planning for the second spray head to move towards the target coordinates includes: recording the current position coordinates of the second spray head in the motion range coordinate system as (x c , y c ), calculating the horizontal and vertical differences Δx and Δy between the target coordinates (x m , y m ) and the current position coordinates (x c , y c ), where Δx = x m - c x , and Δy = y m - y c .

[0010] Further, the second spray head is installed on a guide rail assembly, which includes a horizontal guide rail and a vertical guide rail. Inside the horizontal guide rail and the vertical guide rail, a first lead screw and a second lead screw are respectively installed. The first lead screw and the second lead screw have the same specifications, and both the first lead screw and the second lead screw are connected to a servo motor. For each rotation of the first lead screw and the second lead screw, the movement increments of the second spray head are Δx s and Δy s .

[0011] Further, the number of rotations c x and c y of the first lead screw and the second lead screw when the second spray head moves to the corresponding coordinates are respectively:

[0012] Further, the image is acquired once every specified time interval.

[0013] Further, both the first spray head and the second spray head are swing type spray heads.

[0014] In a second aspect, the present application provides a curing system for the beam body of a high-speed railway precast box girder, which adopts the high-speed railway precast box girder beam body curing method as described in the first aspect, and includes: a first spray module, an image acquisition module, a path planning module, a target movement module, and a second spray module.

[0015] The first spray module is used for the first spray head to spray the side surface of the box girder beam body; the image acquisition module is used to acquire an image covering the side area of the box girder beam body, identify the dry area in the image, and calculate the coordinates and area of the dry area; the path planning module is used to obtain the center point coordinates (x p , y p ) of the dry area with the largest area in the pixel coordinate system, and obtain the coordinates of the center point (x p , y p) target coordinates (x m , y m ). Obtain the current position of the second sprinkler head, and plan the path for the second sprinkler head to move towards the target coordinates (x m , y m ); The target movement module is used to control the second sprinkler head to move along the path to the target coordinates (x m , y m ); The second sprinkler module is used to control the second sprinkler head to spray and process when the second sprinkler head moves to the target coordinates (x m , y m ) so as to moisten the dry area.

[0016] In a third aspect, the present application provides a maintenance device for the beam body of a precast box girder for high-speed railways, which includes a memory and a processor; the memory is used to store computer programs; the processor is used to implement the steps of the maintenance method for the beam body of a precast box girder for high-speed railways as in the first aspect when executing the computer programs.

[0017] The technical solutions provided by the present application have at least the following technical effects or advantages:

[0018] Since the first sprinkler head is used to spray and process the side surface of the box girder beam body, the dry areas are monitored and identified in real time, and the second sprinkler head is timely controlled to move towards the dry areas and infiltrate, effectively solving the problem that some areas are inevitably not infiltrated due to reasons such as nozzle blockage, damage, and insufficient water pressure during the spraying process of the box girder, improving the utilization efficiency of water resources, effectively avoiding beam body quality problems caused by drying, such as cracking and warping, thus greatly improving the product quality and ensuring the efficient operation of the entire nursing process. Description of the Drawings

[0019] Figure 1 is a flowchart of the maintenance method for the beam body of a precast box girder for high-speed railways in the present application;

[0020] Figure 2 is a structural schematic diagram when the first sprinkler head sprays the side surface of the box girder beam body in the present application;

[0021] Figure 3 is a schematic diagram of the conversion of the curved surface a - b into the plane A - B in the present application;

[0022] Figure 4 is a structural schematic diagram when the second sprinkler head is installed on the guide rail assembly in the present application;

[0023] Figure 5 is a structural schematic diagram of the horizontal guide rail and the vertical guide rail in the present application;

[0024] Figure 6It is a flowchart for planning the path of the second sprinkler head to move towards the target coordinates in this application. Specific embodiments

[0025] This application can monitor and identify the dry areas of the box girder body in real time during the sprinkler curing process, and timely control the second sprinkler head to move towards the dry areas and infiltrate, which can improve the utilization efficiency of water resources, effectively avoid the quality problems of the beam body caused by drying, thus greatly improving the product quality and ensuring the efficient operation of the entire curing process.

[0026] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings of the specification and specific embodiments.

[0027] Embodiment 1

[0028] As Figure 1 - Figure 6 shown, this embodiment provides a method for curing the body of a precast box girder for high-speed railways, including the curing methods for the side surface of the beam body, the upper surface of the beam body, the lower surface of the beam body, the beam end, and the catenary.

[0029] The curing method for the side surface of the beam body includes the following steps:

[0030] S100. Use the first sprinkler head 1 to spray the side surface 5 of the box girder body.

[0031] The number of the first sprinkler heads 1 is set to be multiple. Taking a 32-meter precast box girder as an example, 8 are respectively arranged on each side of the two sides of the box girder, which can cover all areas of the outer webs and flange plates of the box girder as much as possible, and 6 are also arranged in the box chamber to spray and cure the inner wall of the box chamber.

[0032] S200. Obtain the image covering the area of the side surface 5 of the box girder body, identify the dry areas in the image, and calculate the coordinates and area of the dry areas.

[0033] As Figure 2 - Figure 3 shown, the side surface 5 of the box girder body is a curved surface shown as a-b, a and b respectively represent the upper and lower two sides of this curved surface. When spraying and curing, the curved surface a-b can be equivalent to a plane A-B, and A and B respectively represent the upper and lower two sides of this plane. When the first sprinkler head 1 sprays and cures the area of the side surface 5 of the box girder body, if there are dry areas in some areas, such as caused by the blockage or damage of the first sprinkler head 1, insufficient water pressure, etc., through the obtained image, the drying situation of the side surface 5 of the box girder body can be monitored in real time, ensuring that the dry areas can be found in time, providing accurate data support for subsequent infiltration treatment.

[0034] Identifying the dry areas in the image and recording the coordinates of the dry areas specifically includes:

[0035] S210. Preprocess the image, including grayscale conversion and filtering for noise reduction.

[0036] If the image of the box girder surface is a color image, which contains three channels RGB, grayscale conversion simplifies it to a single channel, thereby reducing the processing complexity and focusing on the luminance information. The grayscale image may contain noise, and filtering for noise reduction can make the image smoother and the edges more distinct. A Gaussian filter can be used to smooth the image and reduce noise and detail interference.

[0037] S220. Use the threshold segmentation method to segment the grayscale image into a dry area and a wet area, for detecting the edge of the dry area and highlighting the contour of the dry area.

[0038] The global threshold segmentation method can be used to segment the grayscale image into a dry area and a wet area. The grayscale image after filtering for noise reduction is easier to distinguish the bright dry and dark wet areas through threshold segmentation. The image after threshold segmentation has clearer edges. Through Canny edge detection, the edge of the dry area can be accurately found.

[0039] S230. Use the contour detection algorithm to find the contour of the dry area and filter out the non-dry areas.

[0040] After edge detection, the image contains obvious boundaries of the dry area. These boundaries can be identified through contour detection. The areas identified by contour detection may contain noise. By filtering based on area or shape, the irrelevant areas can be removed, and only the important dry areas are retained.

[0041] S240. Calculate the pixel coordinates and area of the center point of each dry area.

[0042] Calculate the bounding box for each dry area, obtain the four vertex coordinates of the bounding box, and then the center point coordinates of each dry area can be calculated based on the bounding box. Through contour detection, the boundary of the dry area can be determined, and thus the smallest rectangle enclosing these boundaries, i.e., the bounding box, can be calculated. The center point is the geometric center of the bounding box. After the four vertex coordinates of the bounding box are determined, the pixel coordinates of its center point can be calculated by geometric methods. The area of each dry area can be calculated using the contour obtained by contour detection. For example, the area of the region enclosed by the contour can be directly calculated through the cv2.contourArea function in OpenCV.

[0043] S300. Obtain the center point coordinates (x p , y p ) of the dry area with the largest area in the pixel coordinate system, and obtain the target coordinates (x p , y p ) of the second sprinkler head 2 facing the center point coordinates (x m , ym ), obtain the current position of the second sprinkler head 2, and plan the path for the second sprinkler head 2 to move towards the target coordinates (x m , y m ).

[0044] By obtaining the center point coordinates of the largest area dry region in the pixel coordinate system, determine the target coordinates of the second sprinkler head 2 facing the center point in the preset motion range coordinate system, and plan the moving path of the sprinkler head to achieve precise infiltration treatment of the dry region.

[0045] Obtain the target coordinates of the second sprinkler head 2 facing the center point coordinates (x p , y p ) as follows: x m, y m ) specifically includes:

[0046] S310. Determine the range of the pixel coordinate system, denoted as (0, 0) to (W p , H p ), where W p and H p respectively represent the width and height of the image; determine the range of the preset motion range coordinate system, denoted as (0, 0) to (W m , H m ), where W m and H m respectively represent the width and height of the motion range;

[0047] S320. Calculate the conversion ratio from pixel coordinates to motion range coordinates, including the horizontal direction ratio S x and the vertical direction ratio S y ,

[0048] S330. Calculate the target coordinates (x p , y p ) of the second sprinkler head 2 facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, x m = x p × S x , y m = y p × S y .

[0049] Planning the path for the second sprinkler head 2 to move towards the target coordinates includes: Denote the current position coordinates of the second sprinkler head 2 in the motion range coordinate system as (x c , y c ), and calculate the target coordinates (x m , y m)The horizontal and vertical differences Δx and Δy between the current position coordinates (x c , y c ) are such that Δx = x m - x c , and Δy = y m - y c .

[0050] By presetting the conversion between the motion range coordinate system and the image coordinate system, automatic positioning and path planning of the spray head can be achieved, reducing manual intervention, improving the automation level and working efficiency of the operation. Precise path planning enables the spray head to move to the target coordinates along the shortest path and at the fastest speed, shortening the processing time, further enhancing the overall working efficiency, realizing the dynamic adjustment of the spray head, flexibly coping with drying areas of different sizes and shapes, and ensuring the comprehensiveness and uniformity of the wetting treatment.

[0051] S400. Control the second spray head 2 to move along the path to the target coordinates (x m , y m ).

[0052] As Figure 4 - Figure 5 shown, the second spray head 2 is installed on the guide rail assembly. The guide rail assembly includes a horizontal guide rail 3 and a vertical guide rail 4. Inside the horizontal guide rail 3 and the vertical guide rail 4, a first lead screw 31 and a second lead screw 41 are respectively installed. The first lead screw 31 and the second lead screw 41 have the same specifications, and both the first lead screw 31 and the second lead screw 41 are connected to a servo motor. For each rotation of the first lead screw 31 and the second lead screw 41, the movement increments of the second spray head 2 are respectively Δx s and Δy s .

[0053] The number of rotation cycles c x and c y of the first lead screw 31 and the second lead screw 41 when the second spray head 2 moves along the path to the corresponding coordinates are respectively:[[]]

[0054] The movement of the second spray head 2 is realized by using the guide rail assembly. Among them, the vertical guide rail 4 can move along the horizontal guide rail 3, and 2 can move along the vertical guide rail 4. The horizontal guide rail 3 and the vertical guide rail 4 respectively control the horizontal and vertical movement of the spray head, thereby accurately positioning the spray head and achieving full coverage of the target area.

[0055] S500. When the second spray head 2 moves to the target coordinates (x m , y m ), control the second spray head 2 to spray for wetting the drying area.

[0056] Both the first spray head 1 and the second spray head 2 are swing-type spray nozzles, which can effectively increase the spraying range, intermittently obtain images of the side area 5 of the box girder body, such as obtaining an image every specified time interval. In the case of multiple dry areas, the dry areas can be infiltrated one by one. The second spray head 2 only sprays in the areas that need to be wetted, avoiding repeated spraying of the already wetted areas, maximizing the utilization efficiency of water resources, improving the efficiency and accuracy of the infiltration treatment of the box girder, achieving efficient wetting of the dry areas, and ensuring the efficient operation of the entire nursing process.

[0057] Example Two

[0058] On the basis of Example One, the maintenance method for the upper surface of the beam body is as follows: Lay a water-stop rubber strip on the edge of the upper surface of the box girder to form a water storage cavity between the water-stop rubber strip and the upper surface of the box girder, and inject water into the water storage cavity to completely cover the upper surface of the box girder body.

[0059] Example Three

[0060] On the basis of Example One, the maintenance method for the lower surface of the beam body is as follows: Inject water into a preset water curing pond, and move the water curing pond so that the lower surface of the box girder body is completely immersed in the water in the water curing pond.

[0061] Example Four

[0062] On the basis of Example One, the maintenance method for the beam end is as follows: Set up a beam end maintenance frame and an anchor sealing maintenance frame, and fix the beam end in the way of "skeleton + moisture-proof tarpaulin + sponge". When water needs to be replenished, just inject water from above the curing board with a water pipe, which can effectively ensure the maintenance quality of the beam end.

[0063] Example Five

[0064] On the basis of Example One, the maintenance method for the catenary: Set up a 1.2m×1.2m support frame at the middle position on the top of the box girder, place a 1m 3 volume water storage tank on the support frame and fix it. The upper part of the water storage tank is connected with a water delivery pipeline for replenishing water at any time. The lower part of the water storage tank is connected with two hoses which are arranged in a strip shape evenly on the catenary foundation, and a drip hole is opened every 3cm. Use a cross clamp to fix the hoses to realize the maintenance of the catenary foundation.

[0065] Example Six

[0066] This embodiment provides a maintenance system for the beam body of high-speed railway precast box girders, which adopts the maintenance method for the beam body of high-speed railway precast box girders as in Example One, and includes: a first spray module, an image acquisition module, a path planning module, a target movement module and a second spray module.

[0067] The first spraying module is used to spray the side surface 5 of the box girder beam body with the first spray head 1; the image acquisition module is used to acquire an image covering the side surface 5 area of the box girder beam body, identify the dry area in the image, and calculate the coordinates and area of the dry area; the path planning module is used to obtain the center point coordinates (x p , y p ) of the dry area with the largest area in the pixel coordinate system, obtain the target coordinates (x p , y p ) of the second spray head 2 facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, obtain the current position of the second spray head 2, and plan the path for the second spray head 2 to move towards the target coordinates (x m , y m ); the target movement module is used to control the second spray head 2 to move to the target coordinates (x m , y m ) along the path; the second spraying module is used to control the second spray head 2 to spray when the second spray head 2 moves to the target coordinates (x m , y m ) so as to moisten the dry area.

[0068] This embodiment has all the advantages of the high-speed railway precast box girder beam body maintenance method in Embodiment 1, and can automate all the steps of the high-speed railway precast box girder beam body maintenance method.

[0069] Embodiment 7

[0070] This embodiment provides a device for maintaining the high-speed railway precast box girder beam body, which includes a memory and a processor; the memory is used to store a computer program; the processor is used to implement the steps of the high-speed railway precast box girder beam body maintenance method as in Embodiment 1 when executing the computer program.

[0071] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] The above-mentioned are only the preferred specific implementation manners of the embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent replacements or changes, and should be covered by the protection scope of the present application.

Claims

1. A curing method for the beam body of precast box girders for high-speed railways, including the curing methods for the side surface, upper surface, and lower surface of the beam body, characterized in that, The curing method for the side surface of the beam body comprises the following steps: Use the first spray head (1) to spray the side surface (5) of the box girder beam body; Obtain an image covering the area of the side surface (5) of the box girder beam body, identify the dry areas in the image, and calculate the coordinates and area of the dry areas; Obtain the center point coordinates (x p , y p ) of the largest area dry region in the pixel coordinate system. Obtain the target coordinates (x p , y p ) of the second spray head (2) facing the center point coordinates (x m , y m ) in the preset motion range coordinate system. Obtain the current position of the second spray head (2), and plan the path for the second spray head (2) to move towards the target coordinates (x m , y m ). Control the second spray head (2) to move to the target coordinates (x m , y m ) according to the path; When the second spray head (2) moves to the target coordinates (x m , y m ), control the second spray head (2) to spray and treat so as to moisten the dry area; Obtain the target coordinates (x p , y p ) of the second spray head (2) facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, specifically including: Determine the range of the pixel coordinate system, denoted as from (0, 0) to (W p , H p ), where W p and H p represent the width and height of the image respectively; determine the range of the preset motion range coordinate system, denoted as from (0, 0) to (W m , H m ), where W m and H m represent the width and height of the motion range respectively. Calculate the conversion ratio from pixel coordinates to motion range coordinates, including the horizontal ratio S x and the vertical ratio S y , Calculate the target coordinates (x p , y p ) of the second spray head (2) facing the center point coordinates (x m , y m ) in the preset motion range coordinate system, where x m = x p × S x , and y m = y p × S y .

2. The curing method for the body of a precast box girder of a high-speed railway according to claim 1, wherein, Identifying the dry areas in the image and recording the coordinates of the dry areas specifically includes: Preprocess the image, including grayscale conversion and filtering for noise reduction; Use the threshold segmentation method to divide the grayscale image into dry areas and wet areas to detect the edges of the dry areas and highlight the contours of the dry areas; Use the contour detection algorithm to find the contours of the dry areas and filter out the non-dry areas; Calculate the pixel coordinates and area of the center point of each dry area.

3. The maintenance method of the precast box girder body of high-speed railway according to claim 1, characterized in that, Planning the path for the second spray head (2) to move towards the target coordinates includes: Record the current position coordinates of the second spray head (2) in the motion range coordinate system as (x c , y c ). Calculate the horizontal and vertical differences Δx and Δy between the target coordinates (x m , y m ) and the current position coordinates (x c , y c ), where Δx = x m - x c , and Δy = y m - y c .

4. The method for curing the body of a precast box girder for high-speed railway according to claim 3, characterized in that, The second spray head (2) is installed on the guide rail assembly, which includes a horizontal guide rail (3) and a vertical guide rail (4). The first lead screw (31) and the second lead screw (41) are respectively installed inside the horizontal guide rail (3) and the vertical guide rail (4). The first lead screw (31) and the second lead screw (41) have the same specifications, and both the first lead screw (31) and the second lead screw (41) are connected to the servo motor. When the first lead screw (31) and the second lead screw (41) rotate one week, the movement increments of the second spray head (2) are Δx s and Δy s .

5. The method for curing the body of a precast box girder for high-speed railway according to claim 4, characterized in that, The second spray head (2) moves along the said path to the corresponding coordinates. The number of rotation cycles c of the first lead screw (31) and the second lead screw (41) x and c y are respectively 6. The method for curing the body of a precast box girder for high-speed railway according to claim 1, characterized in that Obtain the image once every specified time interval.

7. The method for curing the body of a precast box girder for high-speed railway according to claim 1, characterized in that, Both the first spray head (1) and the second spray head (2) are swing-type spray heads.

8. The method for curing the body of a precast box girder for high-speed railway according to claim 1, characterized in that, The curing method for the upper surface of the beam body is: lay a water-stop rubber strip on the edge of the upper surface of the box girder beam body so that the water-stop rubber strip and the upper surface of the box girder beam body form a water storage cavity, and inject water into the water storage cavity to make the water completely cover the upper surface of the box girder beam body.

9. The method for curing the beam body of precast box girders for high-speed railways according to claim 1, characterized in that, The curing method for the lower surface of the beam body is: inject water into a preset water curing pool, and move the water curing pool so that the lower surface of the box girder beam body is completely immersed in the water in the water curing pool.

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