Railway cast-in-situ box girder hydraulic inner mold and test process thereof

Abstract

The application discloses a railway cast-in-place box girder hydraulic inner mold and relates to the technical field of railway cast-in-place box girder construction. The hydraulic inner mold comprises an adjusting assembly, the adjusting assembly comprises an inner mold, a connecting support is arranged in the inner mold, a hydraulic oil cylinder is arranged at the top of the connecting support, a supporting beam is arranged at the top end of the hydraulic oil cylinder, connecting seats are symmetrically arranged at the two ends of the supporting beam, a fixing frame is rotatably installed through the connecting seats, and a first adjusting frame is connected to one side of the fixing frame. The adjusting assembly is arranged to adjust the two symmetrically arranged first adjusting frames through hydraulic pressure. When the inner mold is controlled to move in the box girder, the inner mold can be controlled to shrink according to the moving condition through hydraulic pressure adjustment, so that the normal movement of the inner mold is ensured, the movement interference between the inner mold and the web plate in the box girder is avoided, the problem that the existing device cannot be adjusted and is prone to movement interference during movement and cannot support movement is solved, the normal construction is ensured, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of railway cast-in-place box girder construction technology, and in particular to a hydraulic inner mold for railway cast-in-place box girders and its testing process. Background Technology

[0002] Cast-in-place box girder construction is a widely used technique in the construction of bridges for both high-speed and conventional railways. This method involves erecting supports and formwork on the piers or foundation, completing the reinforcement binding, concrete pouring, and prestressing on-site to form the box girder structure in situ. Compared to precast erection, cast-in-place box girders offer advantages such as better overall integrity, stronger adaptability to complex alignments (e.g., variable cross-sections, small-radius curves), and the elimination of the need for large-scale transport and bridge-building equipment. They are particularly suitable for complex construction environments such as crossing rivers, valleys, or existing lines. However, the interior of a cast-in-place box girder is typically designed as a narrow, box-shaped cavity structure. After the concrete has been poured and reached the specified strength, the internal formwork must be removed. Traditionally, internal formwork is often constructed using loosely assembled steel or wooden molds, requiring workers to enter the box girder and dismantle and transport each piece individually. In standard railway box girders, the internal height is often less than 1.5 meters, and the space is extremely limited, making it difficult for workers to walk upright. The construction environment is harsh, with poor ventilation and lighting conditions. This not only results in extremely high labor intensity and low formwork removal efficiency, but also poses a high risk of collisions and injuries. In order to overcome these shortcomings, in recent years, the industry has proposed a hydraulic internal formwork integral through-hole device. This device can achieve mechanical folding and shrinking of the internal formwork after concrete pouring, and drive the entire formwork longitudinally to the next construction segment through a hydraulic system, thereby avoiding frequent entry of personnel into the box girder cavity for work.

[0003] The existing hydraulic inner mold for cast-in-place box girders in railways does not have an effective adjustment device. It cannot effectively adjust the shrinkage when controlling the inner mold to move inside the box girder. This will cause motion interference during movement. When moving, the front end of the inner mold will deviate to a curve, causing interference with the inner web of the box girder. This will result in the inability to support the movement and make it impossible for construction to proceed normally. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hydraulic inner mold for cast-in-place box girders in railways and its testing process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hydraulic inner mold for cast-in-place box girders in railways includes an adjustment assembly. The adjustment assembly includes an inner mold, within which a connecting bracket is installed. A hydraulic cylinder is mounted on the top of the connecting bracket, and a support beam is mounted on the top of the hydraulic cylinder. Connecting seats are symmetrically arranged at both ends of the support beam, and a fixed frame is rotatably mounted via the connecting seats. A first adjustment frame is connected to one side of the fixed frame. Two sets of first mounting seats are symmetrically fixed to the bottom of the support beam, and a first hydraulic cylinder is rotatably mounted via the first mounting seats. A first fixed seat is arranged on one side of the first adjustment frame, and the other end of the first hydraulic cylinder is rotatably fixed to the first fixed seat. The size and shape of the first adjustment frame are adapted to the inner mold. A secondary adjustment assembly for secondary adjustment is arranged on one side of the first adjustment frame, and an installation assembly for installation is arranged on one side of the inner mold.

[0006] As a further embodiment of the present invention: the secondary adjustment assembly includes a second mounting base, which is mounted on one side of the first adjustment frame. A second hydraulic cylinder is rotatably mounted on the second mounting base. One end of the first adjustment frame is rotatably connected to the second adjustment frame. One end of the second adjustment frame is provided with a second fixed seat. The other end of the second hydraulic cylinder is rotatably connected to the second fixed seat. An extension frame is provided at the end of the second adjustment frame.

[0007] As a further embodiment of the present invention: the installation component includes an installation base, which is fixed to the bottom of the inner mold by casting. Several sets of limiting posts are connected to the bottom of the installation base, and two sets of limiting seats are provided on the top of the installation base. A connecting bracket is provided at the bottom of the hydraulic cylinder, and an adjusting slide is provided at the bottom of the connecting bracket. Two sets of installation brackets are symmetrically arranged at the bottom of the adjusting slide. The size and position of the installation brackets are adapted to the limiting seats.

[0008] As a further embodiment of the present invention: the bottom of the limiting post is provided with a screw hole, and the bottom of the inner mold is also symmetrically provided with screw holes, and a limiting bolt is provided through the screw hole.

[0009] As a further embodiment of the present invention: a support seat is provided on one side of the inner wall of the inner mold, and a transverse adjustment cylinder is rotatably installed on the support seat. Connecting blocks are symmetrically arranged on both sides of the adjustment slide, and one end of the transverse adjustment cylinder is rotatably fixed to the connecting block.

[0010] As a further aspect of the present invention: the first adjustment frame and the second adjustment frame are provided with a plurality of sets of reinforcing ribs, which are arranged in sequence.

[0011] As a further embodiment of the present invention: screw holes are symmetrically opened on both sides of the limiting seat, and screw holes are also opened on both sides of the mounting bracket, and fixing bolts are provided through the screw holes.

[0012] As a further embodiment of the present invention: the mounting bases are arranged in parallel on the inner mold, and the spacing between the several sets of mounting bases is the same.

[0013] As a further aspect of the present invention: the surfaces of the first adjustment frame and the second adjustment frame are provided with lining plates, and the lining plates are made of high-strength alloy steel.

[0014] A testing process for hydraulic internal molds of cast-in-place box girders for railways: S1: Install the mounting base on the bottom inner wall of the inner mold. During installation, align the screw holes at the bottom of the limiting column with the screw holes of the inner mold. After alignment, tighten the limiting bolts to complete the limiting and fixing of the limiting column. After fixing, pour concrete into the bottom of the inner mold to complete the limiting and fixing of the mounting base. After the mounting base is limited, insert the mounting bracket at the bottom of the mounting base into the limiting seat at the top of the mounting base to complete the connection. After connection, tighten the fixing bolts to complete the positioning. S2: After the sliding block is installed in place, the lateral adjustment cylinder is activated to extend and retract, completing the lateral adjustment. The first and second hydraulic cylinders work together to control the angle adjustment of the first and second adjustment frames respectively. The inner mold is adjusted by hydraulically adjusting the angle of the first and second adjustment frames. The inner mold is moved into the box girder by an electric hoist connected to it. During the movement, the inner mold is controlled to shrink by hydraulic adjustment to avoid interference with the box girder and affect normal movement. During the box girder pouring, the inner mold is controlled to release the shrinkage by hydraulic adjustment to provide support for the box girder. After the pouring is completed, the inner mold is controlled to shrink and move into the box girder for position adjustment, which facilitates the subsequent pouring of other positions.

[0015] The beneficial effects of this invention are as follows: 1. By setting up adjustment components, the two sets of symmetrically arranged first adjustment frames can be hydraulically adjusted. When controlling the inner mold to move inside the box girder, the inner mold can be controlled to shrink according to the movement through hydraulic adjustment, thereby ensuring that the inner mold can move normally and avoiding motion interference with the inner web of the box girder during movement. This solves the problem that the existing device cannot be adjusted during movement and is prone to motion interference, which leads to the inability to support the movement. It can ensure the normal progress of construction and effectively improve the efficiency of construction.

[0016] 2. The strength of the first and second adjustment frames can be improved by the several sets of reinforcing ribs arranged sequentially on the first and second adjustment frames, which can prevent deformation during hydraulic adjustment.

[0017] 3. The mounting bracket can be installed and limited by tightening the fixing bolts into the screw holes that align the limit seat and the mounting bracket, thus preventing the mounting bracket from becoming loose or accidentally falling off after installation. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the hydraulic inner mold of a cast-in-place box girder for railway from the main perspective, as proposed in this invention. Figure 2 This is a top view of the hydraulic inner mold for a cast-in-place box girder of a railway, as proposed in this invention. Figure 3 This is a schematic diagram of the hydraulic inner formwork support part for a cast-in-place box girder of railway proposed in this invention; Figure 4 This is a schematic diagram of the hydraulic inner mold connection part of a cast-in-place box girder for railway proposed in this invention; Figure 5 This is a schematic diagram of the structure of the hydraulic inner mold installation part of a cast-in-place box girder for railway proposed in this invention; Figure 6 This is a schematic diagram of the hydraulic inner mold unfolding state of a cast-in-place box girder for railway proposed in this invention; Figure 7 This is a schematic diagram of the hydraulic adjustment part of the hydraulic inner mold of a cast-in-place box girder for railway, as proposed in this invention. Figure 8 This is a schematic diagram of the structure of the hydraulic inner mold fixing part of a cast-in-place box girder for railway proposed in this invention.

[0019] In the diagram: 1. Inner mold; 2. Support beam; 3. Connecting seat; 4. Fixing frame; 5. First adjusting frame; 6. First mounting seat; 7. First hydraulic cylinder; 8. Second mounting seat; 9. Second hydraulic cylinder; 10. First fixing seat; 11. Second adjusting frame; 12. Second fixing seat; 13. Hydraulic cylinder; 14. Extension frame; 15. Connecting bracket; 16. Adjusting slide; 17. Connecting block; 18. Limiting seat; 19. Mounting base; 20. Limiting bolt; 21. Limiting post; 22. Mounting bracket; 23. Lateral adjusting cylinder; 24. Support seat. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Example

[0022] A hydraulic inner mold for cast-in-place box girders in railways, such as Figure 1-8As shown, the device includes an adjustment assembly, which includes an inner mold 1. A connecting bracket 15 is provided inside the inner mold 1. A hydraulic cylinder 13 is provided on the top of the connecting bracket 15. A support beam 2 is provided on the top of the hydraulic cylinder 13. Connecting seats 3 are symmetrically provided at both ends of the support beam 2. A fixed frame 4 is rotatably installed through the connecting seats 3. A first adjustment frame 5 is connected to one side of the fixed frame 4. Two sets of first mounting seats 6 are provided at the bottom of the support beam 2. The two sets of first mounting seats 6 are symmetrically fixed to the bottom of the support beam 2. A first hydraulic cylinder 7 is rotatably installed through the first mounting seats 6. A first fixed seat 10 is provided on one side of the first adjustment frame 5. The other end of the first hydraulic cylinder 7 is rotatably fixed to the first fixed seat 10. The size and shape of the first adjustment frame 5 are adapted to the inner mold 1. A secondary adjustment assembly for secondary adjustment is provided on one side of the first adjustment frame 5. An installation assembly for installation is provided on one side of the inner mold 1. In use, the connecting bracket 15 can be installed and fixed using the installation components. After fixing, the first adjusting bracket 5 can be firmly set inside the inner mold 1. The top of the support beam 2 fits against the inner wall of the top of the inner mold 1, providing effective support for the top of the inner mold 1. By activating the two sets of first hydraulic cylinders 7 to extend and retract, the two sets of first adjusting brackets 5 on both sides of the support beam 2 can be driven to rotate. The angle can be adjusted by rotating the two sets of first adjusting brackets 5, allowing them to fully contact and adjust the inner mold 1. The rotation of the fixing bracket 4 and the connecting seat 3 ensure that the first adjusting bracket 5 can support the movement, avoiding the restriction of freedom when adjusting the angle. When constructing a cast-in-place box girder for railways, the inner mold 1 can be sent into the box girder. After being sent in, the movement of the inner mold 1 can be manually controlled by connecting an electric hoist. The inner mold 1, which provides support inside the box girder, replaces the manual entry method, greatly improving safety and preventing accidental injuries to workers. It also solves the problem of narrow passage and difficulty for workers to walk inside the box girder, effectively improving construction efficiency. When controlling the rotation of the two sets of first adjustment frames 5 to adjust the angle, the inner mold 1 can be adjusted simultaneously. When controlling the movement of the inner mold 1 in the box girder, the angle adjustment of the first adjustment frame 5 can control the contraction of the inner mold 1. When the inner mold 1 moves longitudinally, its front end will deviate towards the curve, causing interference with the inner web of the box girder. The contraction of the inner mold 1 controlled by the first adjustment frame 5 can be hydraulically adjusted during movement, thereby ensuring that it can support the movement, avoid interference with the inside of the box girder, and ensure that the inner mold 1 can pass smoothly through the box girder. The secondary adjustment assembly includes a second mounting base 8, which is mounted on one side of the first adjustment frame 5. A second hydraulic cylinder 9 is rotatably mounted on the second mounting base 8. A second adjustment frame 11 is rotatably connected to one end of the first adjustment frame 5. A second fixed seat 12 is provided at one end of the second adjustment frame 11. The other end of the second hydraulic cylinder 9 is rotatably connected to the second fixed seat 12. An extension frame 14 is provided at the end of the second adjustment frame 11. In use, the second hydraulic cylinder 9 is activated to extend and retract, which controls the rotation of the second adjusting frame 11 and adjusts the angle with the first adjusting frame 5. The first adjusting frame 5 alone cannot fully cover the inner mold 1. The cooperation of the first adjusting frame 5 and the second adjusting frame 11 can make more comprehensive contact with the inner mold 1, thus enabling more comprehensive hydraulic adjustment. The cooperation of the first hydraulic cylinder 7 and the second hydraulic cylinder 9 can adjust the angle of the first adjusting frame 5 and the second adjusting frame 11, and the inner mold 1 can be fully retracted during movement, thereby further ensuring smooth movement and preventing interference with the inside of the box girder in some areas during movement. By setting the extension frame 14, the coverage area can be further extended, which can further improve the comprehensiveness of hydraulic adjustment. The mounting components include a mounting base 19, which is fixed to the bottom of the inner mold 1 by casting. Several sets of limiting posts 21 are connected to the bottom of the mounting base 19, and two sets of limiting seats 18 are provided on the top of the mounting base 19. A connecting bracket 15 is provided at the bottom of the hydraulic cylinder 13, and an adjusting slide 16 is provided at the bottom of the connecting bracket 15. Two sets of mounting brackets 22 are symmetrically provided at the bottom of the adjusting slide 16. The size and position of the mounting brackets 22 are adapted to the limiting seats 18. When in use, the mounting base 19 can be placed on the bottom inner wall of the inner mold 1. After it is placed in place, the mounting base 19 can be fixed by pouring concrete. This can provide a firm and stable positioning and prevent unnecessary displacement of the mounting base 19 during use. The limiting post 21 at the bottom of the mounting base 19 can further limit the mounting base 19 during pouring, which can improve the firmness of the fixation and prevent unnecessary displacement. When installing the hydraulic cylinder 13, the two sets of mounting brackets 22 at the bottom of the adjusting slide 16 can be aligned with the two sets of limiting seats 18 at the top of the mounting base 19 and snapped in. After snapping in, the installation of the hydraulic cylinder 13 can be completed. After installation, the inner mold 1 can be hydraulically adjusted normally. To further secure the mounting base 19, such as... Figure 1 As shown, the bottom of the limiting post 21 is provided with a screw hole, and the bottom of the inner mold 1 is also symmetrically provided with screw holes, and a limiting bolt 20 is provided through the screw hole; When using the installation base 19, align the screw holes at the bottom of the limiting post 21 with the screw holes at the bottom of the inner mold 1. After alignment, tighten the limiting bolts 20 at the aligned screw holes to reinforce the limiting post 21. Reinforcing the limiting post 21 will further fix the installation base 19 and effectively position it, preventing unnecessary displacement of the installation base 19 during pouring. In order to make lateral adjustments, such as Figure 1As shown, a support seat 24 is provided on one side of the inner wall of the inner mold 1. A transverse adjustment cylinder 23 is rotatably installed on the support seat 24. Connecting blocks 17 are symmetrically arranged on both sides of the adjustment slide 16. One end of the transverse adjustment cylinder 23 is rotatably fixed to the connecting block 17. In use, the extension and retraction of the lateral adjustment cylinder 23 can provide lateral support, and can provide lateral adjustment of the inner mold 1 during adjustment, thereby further ensuring that the inner mold 1 can pass normally through the inside of the box girder; To reinforce the first adjusting frame 5 and the second adjusting frame 11, such as... Figure 1 , 6 As shown, the first adjusting frame 5 and the second adjusting frame 11 are provided with several sets of reinforcing ribs, which are arranged in sequence. In use, the strength of the first adjustment frame 5 and the second adjustment frame 11 can be improved by the several sets of reinforcing ribs arranged sequentially on the first adjustment frame 5 and the second adjustment frame 11, which can prevent deformation during hydraulic adjustment. In order to secure it after installation, such as Figure 8 As shown, screw holes are symmetrically opened on both sides of the limiting seat 18, and screw holes are also opened on both sides of the mounting bracket 22. Fixing bolts are set through the screw holes. When in use, after installing the two sets of mounting brackets 22 into the two sets of limiting seats 18, their screw holes are aligned. After alignment, the fixing bolts can be tightened. After tightening the bolts, the mounting brackets 22 can be installed and fixed, avoiding the problems of loose installation and accidental detachment. To ensure effective support for inner mold 1, such as Figure 2 , 5 As shown, the mounting bases 19 are arranged in parallel on the inner mold 1, and the spacing between the several sets of mounting bases 19 is the same. In use, several sets of mounting bases 19 are arranged at equal intervals inside the inner mold 1. The equal interval arrangement can ensure the support effect of the inner mold 1 and avoid the situation of local reduction in strength. Example

[0023] To further improve strength, refer to Figure 6 , 7 A hydraulic inner mold for cast-in-place box girder of railway. This embodiment makes the following improvements compared with embodiment 1: the surfaces of the first adjusting frame 5 and the second adjusting frame 11 are provided with lining plates, and the material of the lining plates is high-strength alloy steel. In use, the strength of the first adjusting frame 5 and the second adjusting frame 11 can be further improved by the liner plates provided on their surfaces. When they are in contact with the inner mold 1 for support and adjustment, the strength of the liner plates made of high-strength alloy steel can be further improved, thereby avoiding accidental deformation during contact. The process flow of a hydraulic internal mold testing technology for cast-in-place box girders in railways is as follows: S1: Install the mounting base 19 on the bottom inner wall of the inner mold 1. During installation, align the screw hole at the bottom of the limiting post 21 with the screw hole of the inner mold 1. After alignment, tighten the limiting bolt 20 to complete the limiting and fixing of the limiting post 21. After fixing, pour concrete into the bottom of the inner mold 1 to complete the limiting and fixing of the mounting base 19. After the mounting base 19 is limited, insert the mounting bracket 22 at the bottom of the mounting base 19 into the limiting seat 18 at the top of the mounting base 19 to complete the connection. After connection, tighten the fixing bolt to complete the positioning. S2: After the sliding block 16 is installed in place, the lateral adjustment cylinder 23 is activated to extend and retract, completing the lateral adjustment. The first hydraulic cylinder 7 and the second hydraulic cylinder 9 work together to control the angle adjustment of the first adjustment frame 5 and the second adjustment frame 11 respectively. The inner mold 1 is adjusted by hydraulically adjusting the angle of the first adjustment frame 5 and the second adjustment frame 11. The inner mold 1 is moved into the box girder by connecting an electric hoist. During the movement, the inner mold 1 is controlled to shrink by hydraulic adjustment to avoid interference with the box girder and affect normal movement. During the box girder pouring, the inner mold 1 is controlled to release the shrinkage by hydraulic adjustment to provide support for the box girder. After the pouring is completed, the inner mold 1 is controlled to shrink so that it moves into the box girder for position adjustment, which facilitates the subsequent pouring of other positions.

[0024] The above description is merely a preferred embodiment of the present invention. For parts that do not require creative effort in circuit control, signal control and transmission, please refer to the prior art. However, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic inner mold for cast-in-place box girders in railways, characterized in that, The system includes an adjustment assembly, which includes an inner mold (1). A connecting bracket (15) is installed inside the inner mold (1). A hydraulic cylinder (13) is installed on the top of the connecting bracket (15). A support beam (2) is installed on the top of the hydraulic cylinder (13). Connecting seats (3) are symmetrically arranged at both ends of the support beam (2). A fixed frame (4) is rotatably mounted via the connecting seats (3). A first adjustment frame (5) is connected to one side of the fixed frame (4). Two sets of first mounting seats (6) are installed at the bottom of the support beam (2). The first mounting base (6) is symmetrically fixed to the bottom of the support beam (2) on the left and right respectively. The first hydraulic cylinder (7) is rotatably mounted on the first mounting base (6). The first fixed base (10) is provided on one side of the first adjusting frame (5). The other end of the first hydraulic cylinder (7) is rotatably fixed to the first fixed base (10). The size and shape of the first adjusting frame (5) are adapted to the inner mold (1). A secondary adjusting component for secondary adjustment is provided on one side of the first adjusting frame (5). An installation component for installation is provided on one side of the inner mold (1).

2. The hydraulic inner mold for cast-in-place box girder of railway according to claim 1, characterized in that, The secondary adjustment assembly includes a second mounting base (8), which is mounted on one side of the first adjustment frame (5). A second hydraulic cylinder (9) is rotatably mounted on the second mounting base (8). A second adjustment frame (11) is rotatably connected to one end of the first adjustment frame (5). A second fixed seat (12) is provided at one end of the second adjustment frame (11). The other end of the second hydraulic cylinder (9) is rotatably connected to the second fixed seat (12). An extension frame (14) is provided at the end of the second adjustment frame (11).

3. The hydraulic inner mold for cast-in-place box girder of railway according to claim 1, characterized in that, The installation assembly includes an installation base (19), which is fixed to the bottom of the inner mold (1) by casting. Several sets of limiting posts (21) are connected to the bottom of the installation base (19). Two sets of limiting seats (18) are provided on the top of the installation base (19). A connecting bracket (15) is provided at the bottom of the hydraulic cylinder (13). An adjusting slide (16) is provided at the bottom of the connecting bracket (15). Two sets of installation brackets (22) are symmetrically provided at the bottom of the adjusting slide (16). The size and position of the installation bracket (22) are adapted to the limiting seats (18).

4. The hydraulic inner mold for cast-in-place box girder of railway according to claim 3, characterized in that, The bottom of the limiting post (21) is provided with a screw hole, and the bottom of the inner mold (1) is also provided with a screw hole symmetrically. A limiting bolt (20) is provided through the screw hole.

5. The hydraulic inner mold for cast-in-place box girder of railway according to claim 3, characterized in that, A support seat (24) is provided on one side of the inner wall of the inner mold (1). A transverse adjustment cylinder (23) is rotatably installed on the support seat (24). Connecting blocks (17) are symmetrically arranged on both sides of the adjustment slide (16). One end of the transverse adjustment cylinder (23) is rotatably fixed to the connecting block (17).

6. The hydraulic inner mold for cast-in-place box girder of railway according to claim 1, characterized in that, The first adjustment frame (5) and the second adjustment frame (11) are provided with several sets of reinforcing ribs, which are arranged in sequence.

7. The hydraulic inner mold for cast-in-place box girder of railway according to claim 3, characterized in that, The limiting seat (18) has symmetrical screw holes on both sides, and the mounting bracket (22) also has screw holes on both sides, with fixing bolts installed through the screw holes.

8. The hydraulic inner mold for cast-in-place box girder of railway according to claim 3, characterized in that, The mounting bases (19) are arranged in parallel on the inner mold (1), and the spacing between the several sets of mounting bases (19) is the same.

9. The hydraulic inner mold for cast-in-place box girder of railway according to claim 1, characterized in that, The first adjustment frame (5) and the second adjustment frame (11) are provided with lining plates, which are made of high-strength alloy steel.

10. A hydraulic inner mold for cast-in-place box girder of railway and its testing process according to claim 9, characterized in that, The hydraulic inner mold for cast-in-place box girders of railways, as described in any one of claims 1-9, includes the following steps in its testing process: S1: Install the mounting base (19) on the bottom inner wall of the inner mold (1). When installing, align the screw hole at the bottom of the limiting column (21) with the screw hole of the inner mold (1). After alignment, tighten the limiting bolt (20) to complete the limiting fixation of the limiting column (21). After fixing, pour concrete into the bottom of the inner mold (1) to complete the limiting fixation of the mounting base (19). After the mounting base (19) is limited, insert the mounting bracket (22) at the bottom of the mounting base (19) into the limiting seat (18) at the top of the mounting base (19) to complete the connection. After connection, tighten the fixing bolt to complete the positioning. S2: After the sliding block (16) is installed in place, the horizontal adjustment cylinder (23) is started to extend and retract to complete the horizontal adjustment. The first hydraulic cylinder (7) and the second hydraulic cylinder (9) are used to control the first adjustment frame (5) and the second adjustment frame (11) to adjust the angle respectively. The inner mold (1) is adjusted by hydraulic adjustment of the angle of the first adjustment frame (5) and the second adjustment frame (11). The inner mold (1) is connected to the electric hoist and pulled to move inside the box beam. When moving, the inner mold (1) is controlled to shrink by hydraulic adjustment to avoid interference between the inner mold (1) and the box beam and affect normal movement. When the box beam is poured, the inner mold (1) is controlled to release the shrinkage by hydraulic adjustment to provide support for the box beam. After the pouring is completed, the inner mold (1) is controlled to shrink so that it moves inside the box beam to adjust its position, which is convenient for subsequent pouring of other positions.

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