Large-span elevated prestressed reinforced concrete box girder formwork and construction method thereof

Abstract

The application discloses a large-span high-pier prestressed reinforced concrete box beam formwork and a construction method thereof, and belongs to the technical field of road and bridge engineering. The application comprises symmetrically arranged first side forms and second side forms, and a top plate arranged on the first side forms and the second side forms. Opposite side walls of the first side forms and the second side forms are provided with accommodating grooves, and an inner film is arranged in a space formed by the two accommodating grooves. The inner film comprises a first core body and a second core body, and the first core body and the second core body are provided with inner demolding mechanisms. The inner demolding mechanism comprises an inner threaded cylinder arranged in a second accommodating groove of the corresponding core body. An inner cavity of the inner threaded cylinder is threadedly connected with a rotating cylinder. The rotating cylinder is connected with a push plate and a first driving assembly. The first driving assembly drives the two push plates to push each other through the rotating cylinder, so that the first core body and the second core body are away from each other and are separated from the inner wall of the box beam, and are removed from the inner cavity of the box beam.

Description

Technical Field

[0001] This invention belongs to the field of road and bridge engineering technology, and more specifically, relates to a formwork for a large-span elevated prestressed reinforced concrete box girder and its construction method. Background Technology

[0002] Box girders are a type of beam structure used in bridge engineering. They are hollow inside with flanges on both sides of the upper part, resembling a box, hence the name. They are usually divided into single-box and multi-box structures. Reinforced concrete box girders are divided into precast box girders and cast-in-place box girders. Box girders precast on an independent site can be erected after the substructure is completed using a bridge erection machine, which can accelerate the project progress and save construction time. Cast-in-place box girders are mostly used for large continuous bridges.

[0003] The construction steps for box girders are as follows: The formwork consists of three parts: the bottom formwork, the side formwork, and the inner formwork. These are prefabricated as components, then the supports, bottom formwork, and side formwork are erected, followed by the inner formwork that forms the cavity of the box girder. After the inner formwork is erected, concrete can be poured. Once the box girder is cast, the bottom formwork, side formwork, and inner formwork need to be dismantled sequentially, which increases the demolding time and results in low demolding efficiency. The demolding of the inner formwork is particularly complex, as it is located inside the formed box girder after casting, making the demolding process even more cumbersome.

[0004] A search revealed Chinese Patent Application CN 110126082 A, which discloses a demolding device and method for the inner mold of a concrete box girder. This application includes a left top mold, a left side mold, a left bottom mold, a hydraulic support rod at the upper left corner, a lower left support plate, a right top mold, a right side mold, a right bottom mold, and a hydraulic support rod at the upper right corner. The inner mold is divided into left and right parts, each of which is a partially movable unit. This application uses the hydraulic support rod to drive the connected top molds for demolding, effectively improving the separation of the inner mold from the inner wall of the box girder. However, the folding design of the inner mold in this application reduces its overall strength. During concrete pouring, the inner mold is easily deformed by the impact of the concrete, which can cause gaps to form at the overlap between the left and right top molds, increasing the risk of grout leakage. Summary of the Invention

[0005] 1. The problem to be solved

[0006] To address at least some of the problems existing in the prior art, this invention proposes a formwork for large-span elevated prestressed reinforced concrete box girders and its construction method. By employing the technical solution of this invention, the demolding efficiency of the box girder can be effectively improved while ensuring the overall structural strength of the inner formwork, thereby facilitating construction progress.

[0007] 2. Technical Solution

[0008] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] The present invention provides a formwork for a large-span elevated prestressed reinforced concrete box girder, comprising a first side form and a second side form arranged symmetrically, and a top plate disposed on the first side form and the second side form. The opposite side walls of the first side form and the second side form are provided with receiving grooves, and the inner form is located in the space formed by the two receiving grooves.

[0010] The inner mold includes a first core and a second core, with end plates connected to the ends of the first core and the second core that are far apart from each other;

[0011] Both the first core and the second core are provided with an internal demolding mechanism. The internal demolding mechanism includes an internally threaded cylinder disposed in a second receiving groove on the corresponding core. The inner cavity of the internally threaded cylinder is threadedly connected to a rotating cylinder, which is connected to a push plate and a first driving assembly. The first driving assembly drives the push plate to extend and retract through the rotating cylinder.

[0012] Furthermore, the first driving component includes a rotating shaft, one end of which is connected to a first driving source disposed on an end plate, and the other end extends into the rotating cylinder and engages with the inner wall of the rotating cylinder.

[0013] Furthermore, the rotating cylinder is fitted with an external threaded block that is threadedly connected to the inner wall of the internal threaded cylinder.

[0014] Furthermore, the rotating shaft is provided with a protrusion, and the inner wall of the rotating cylinder is provided with a limiting groove that cooperates with the protrusion.

[0015] Furthermore, an external demolding mechanism is provided between the first side mold and the second side mold. The external demolding mechanism includes a bidirectional lead screw disposed in a first receiving groove on the first side mold and the second side mold. The bidirectional lead screw is connected to a second driving assembly, which drives the bidirectional lead screw to perform threaded transmission with the first side mold and the second side mold.

[0016] Furthermore, the second drive assembly includes a second drive source disposed on the support plate, the second drive source being connected to a worm wheel on a bidirectional lead screw via a worm gear; the support plate is connected to the bidirectional lead screw via a support column.

[0017] Furthermore, the bidirectional lead screw is fitted with two internal threaded blocks, the outer peripheral wall of which is connected to the inner wall of the corresponding first receiving groove, and the inner wall of the internal threaded block is provided with internal threads that cooperate with the bidirectional lead screw.

[0018] Furthermore, the first side mold is provided with a first docking plate, and the second side mold is provided with a first docking groove into which the first docking plate is inserted; the end of the first core is provided with a second docking plate, and the second core is provided with a second docking groove into which the second docking plate is inserted.

[0019] Furthermore, the end plate, the first side mold, and the second side mold are all provided with slots for the reinforcing bars to pass through, as well as movable wheels for sliding.

[0020] The present invention discloses a construction method for a reinforced concrete box girder, which includes the following steps:

[0021] S1, Casting of box girder

[0022] Concrete is injected into the assembled formwork cavity through the feeding port on the top plate;

[0023] S2, Demolding of the inner mold

[0024] After the box girder is formed, the first drive source is started, and the rotating shaft drives the external threaded block to rotate through the rotating cylinder. Since the external threaded block is threadedly connected to the internal threaded cylinder, and the internal threaded cylinder is fixed in the inner mold, the rotating cylinder is forced to move horizontally in the internal threaded cylinder, so that the two push plates push each other, thereby causing the first core and the second core to move away from each other and separate from the inner wall of the box girder.

[0025] S3, demolding of the side mold

[0026] The second drive source is activated, which drives the bidirectional lead screw to rotate through the meshing worm gear and worm. The bidirectional lead screw drives the first side mold and the second side mold to move away from each other through the internal thread block, so that the first side mold and the second side mold are separated from the outer wall of the box girder.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) A prestressed reinforced concrete box girder formwork for a large-span elevated structure according to the present invention, wherein the inner mold includes a first core and a second core, and an inner demolding mechanism is provided between the first core and the second core; when the inner demolding operation is required, only the first drive source needs to be started, and the rotating shaft drives the external threaded block to rotate through the rotating cylinder; since the external threaded block is threadedly connected to the internal threaded cylinder, and the internal threaded cylinder is fixed inside the inner mold, the rotating cylinder is forced to move horizontally inside the internal threaded cylinder, so that the two push plates push each other, thereby causing the first core and the second core to move away from each other, separate from the inner wall of the box girder, and move out of the inner cavity of the box girder. The box girder formwork of the present invention can not only complete the separation operation between the inner mold and the box girder after the box girder is cast, but also automatically remove the inner mold from the inner cavity of the box girder. Compared with the traditional folding inner mold, the demolding efficiency is higher, and the overall strength of the inner mold is greater, making it less prone to deformation and grout leakage.

[0030] (2) The present invention provides a formwork for a prestressed reinforced concrete box girder with a large span. An external demolding mechanism is provided between the first side mold and the second side mold. When external demolding is required, the second drive source is activated, and the bidirectional screw is driven to rotate through the meshing worm wheel and worm. The bidirectional screw drives the first side mold and the second side mold to move away from each other through the internal thread block, so that the first side mold and the second side mold are separated from the outer wall of the box girder, thereby further improving the demolding efficiency of the box girder and improving the work efficiency. Attached Figure Description

[0031] Figure 1 This is a front view of a prestressed reinforced concrete box girder formwork for a large-span elevated structure according to the present invention.

[0032] Figure 2 This is a schematic diagram of the internal structure of a prestressed reinforced concrete box girder formwork for a large-span elevated structure according to the present invention.

[0033] Figure 3 This is a schematic diagram of the assembly between the inner demolding mechanism and the inner mold in this invention;

[0034] Figure 4 This is a schematic diagram of the internal demolding mechanism in this invention;

[0035] Figure 5 for Figure 2 A magnified view of a portion of point A in the middle;

[0036] Figure 6 for Figure 4 A magnified view of a portion of point B in the middle.

[0037] In the figure: 1. Side mold; 11. First side mold; 12. Second side mold; 13. Receiving groove; 14. First receiving groove; 15. First mating plate; 16. First mating groove; 17. Slot;

[0038] 2. Inner mold; 21. First core; 22. Second core; 23. Second receiving groove; 24. Second docking plate; 25. Second docking groove; 3. Top plate; 31. Feed port; 4. End plate;

[0039] 5. Internal demolding mechanism; 51. Internal threaded cylinder; 52. Rotating cylinder; 521. Limiting groove; 53. Push plate; 54. External threaded block;

[0040] 55. First drive assembly; 551. Rotary shaft; 552. First drive source; 553. Protrusion; 56. Fixing block; 57. Mounting plate;

[0041] 6. External demolding mechanism; 61. Two-way lead screw; 62. Second drive source; 63. Worm gear; 64. Worm wheel; 65. Support plate; 66. Support column; 67. Internal threaded block; 68. Reinforcing plate; 69. Stop plate;

[0042] 7. Reinforcing steel bars; 8. Casters. Detailed Implementation

[0043] The present invention will be further described below with reference to specific embodiments.

[0044] Example 1

[0045] Combination Figure 1 , Figure 2 As shown, this embodiment of a prestressed reinforced concrete box girder formwork for a large-span elevated structure includes a side formwork 1 and a top plate 3 on top of the side formwork 1. The side formwork 1 includes a first side formwork 11 and a second side formwork 12 arranged opposite each other. Each of the first side formwork 11 and the second side formwork 12 has a receiving groove 13 on its closest side. The inner formwork 2 is disposed within the space formed by the two receiving grooves 13. This allows the lower surface of the top plate 3, the outer peripheral wall of the inner formwork 2, and the inner peripheral wall of the receiving grooves 13 to together form a hollow area to be poured. Concrete is poured into this area to form the box girder structure.

[0046] The top plate 3 is engaged with a corresponding slot on the side mold 1 via a locking block at its bottom. This locking mechanism facilitates the assembly of the top plate 3 and the side mold 1, and also ensures a tight connection between the first side mold 11 and the second side mold 12. The top plate 3 is also provided with a feeding port 31.

[0047] The inner mold 2 includes a first core 21 and a second core 22. The ends of the first core 21 and the second core 22 that are far apart from each other are connected to end plates 4, and the two end plates 4 are located on the outer sides of both ends of the side mold 1.

[0048] In addition, slots 17 for the reinforcing bars 7 to pass through are provided at the opposite positions of the two end plates 4, and the bottom of the end plates 4 is also provided with casters 8. Of course, slots 17 are also provided at corresponding positions on the first side mold 11 and the second side mold 12, and casters 8 are also provided at the bottom of the first side mold 11 and the second side mold 12.

[0049] In this embodiment, a prestressed reinforced concrete box girder formwork for a large-span elevated structure includes a second, interconnecting receiving groove 23 at corresponding positions of the first core 21 and the second core 22. An internal demolding mechanism 5 is installed within this second receiving groove 23. This internal demolding mechanism 5 is used to detach the inner mold 2 from the inner wall of the box girder and automatically remove it from the inner cavity of the box girder, thus completing the entire internal demolding operation.

[0050] Specifically, refer to Figure 3 As shown, the internal demolding mechanism 5 includes an internal threaded cylinder 51, a rotating cylinder 52, and a first drive assembly 55. A fixing block 56 is fitted onto the internal threaded cylinder 51, the outer peripheral wall of which is connected to the inner wall of the second receiving groove 23, and one end of the internal threaded cylinder 51 is connected to the end plate 4.

[0051] The rotating cylinder 52 is provided with an external threaded block 54, which is threadedly connected to the inner wall of the internal threaded cylinder 51. In addition, the rotating cylinder 52 is also connected to a first drive assembly 55, which drives the rotating cylinder 52 to move horizontally within the internal threaded cylinder 51, thereby causing the push plates 53 at the ends of the two rotating cylinders 52 to push each other, thereby causing the first side mold 11 and the second side mold 12 to move away from each other, detach from the inner wall of the box girder and move out of the inner cavity of the box girder.

[0052] like Figure 4 , Figure 6 As shown, the first drive assembly 55 includes a rotating shaft 551, one end of which is connected to a first drive source 552, and the other end extends into the rotating cylinder 52 and is engaged with the inner wall of the rotating cylinder 52.

[0053] The first driving source 552 is preferably a motor, which is mounted on the outside of the end plate 4 via a mounting plate 57. The end of the rotating shaft 551 is provided with a protrusion 553, and the inner walls of the rotating cylinder 52 and the external threaded block 54 are provided with limiting grooves 521 that cooperate with the protrusion 553 to realize the snap-fit ​​connection between the rotating shaft 551 and the rotating cylinder 52.

[0054] In addition, in this embodiment, the first core 21 is provided with a second docking plate 24 at its end, and the second core 22 is provided with a second docking groove 25 for the second docking plate 24 to be inserted. Through the mutual cooperation of the second docking plate 24 and the second docking groove 25, not only can the assembly between the first core 21 and the second core 22 be guided, but the stability of the connection between the two can also be ensured.

[0055] This embodiment describes a formwork for a large-span elevated prestressed reinforced concrete box girder. Its working principle and process are as follows:

[0056] First, the first side mold 11 and the second side mold 12 are joined together, so that the second joining plate 24 is inserted into the second joining groove 25. Next, the first core 21 and the second core 22 are inserted into the receiving groove 13, and the top plate 3 is installed on top of the first side mold 11 and the second side mold 12. At the same time, the two end plates 4 are positioned on the outer walls of the first side mold 11 and the second side mold 12. Then, the reinforcing bars 7 are inserted into the corresponding slots 17. The reinforcing bars 17 limit the inner mold 2 to prevent it from shaking or shifting during the pouring process, thereby affecting the pouring quality of the box girder.

[0057] It is important to note that when threading longitudinal reinforcing bars (the reinforcing bars in the slots on the end plate), the inner formwork 2 must be avoided. That is, the slot 17 is not required where the end plate 4 contacts the end of the inner formwork 2. When threading transverse reinforcing bars (the reinforcing bars in the slots on the first and second side forms), they need to be disconnected at the inner formwork 2. In other words, the transverse reinforcing bars can be divided into two parts, located on both sides of the inner formwork 2.

[0058] Then, concrete is injected into the area to be poured, which is composed of the first side mold 11, the second side mold 12, the top plate 3 and the inner mold 2, through the feeding port 31, thereby completing the pouring operation of the box girder.

[0059] When the box girder is cast and needs to be demolded, the first drive source 552 is started, and the motor drives the rotating shaft 551 to rotate. The rotating shaft 551 drives the protrusion 553 to rotate. Through the connection between the protrusion 553 and the limiting groove 521, the protrusion 553 drives the rotating cylinder 52 to rotate. The rotating cylinder 52 drives the external thread block 54 to rotate. Due to the thread between the external thread block 54 and the internal thread cylinder 51, and the internal thread cylinder 51 being fixed in the first core 21 and the second core 22 by the fixing block 56, the external thread block 54 will move horizontally inside the internal thread cylinder 51. Then the rotating cylinder 52 will drive the push plate 53 to move, so that the two push plates 53 push each other, which will cause the first core 21 and the second core 22 to move on the inner wall of the box girder. And the second docking plate 24 will slide on the inner wall of the second docking groove 25, thereby realizing the separation of the first core 21 and the second core 22 from the inner wall of the box girder and completing the internal demolding operation of the box girder.

[0060] Example 2

[0061] This embodiment of a prestressed reinforced concrete box girder formwork for a large-span elevated structure aims to further improve the efficiency of box girder demolding. Based on Embodiment 1, an external demolding mechanism 6 is provided between the first side mold 11 and the second side mold 12 to improve the separation efficiency between the first side mold 11, the second side mold 12 and the outer wall of the box girder.

[0062] refer to Figure 1 As shown, the first core 21 and the second core 22 are provided with a second receiving groove 23 that penetrates each other at the lower part of the receiving groove 13. The second receiving groove 23 is used to assemble the outer demolding mechanism 6.

[0063] refer to Figure 5 As shown, the external demolding mechanism 6 includes a bidirectional lead screw 61, which is located within the second receiving groove 23 and threadedly connected to the inner wall of the second receiving groove 23. The bidirectional lead screw 61 is also connected to a second drive assembly, which drives the bidirectional lead screw 61 to rotate. Through the threaded transmission between the bidirectional lead screw 61 and the first side mold 11 and the second side mold 12, the first side mold 11 and the second side mold 12 are driven away from each other, completing the demolding operation from the outer wall of the box girder.

[0064] Specifically, the second drive assembly includes a second drive source 62, which is preferably a motor. The output end of the motor is connected to a worm gear 63. The bidirectional lead screw 61 is provided with a worm wheel 64 that meshes with the worm gear 63, and internal thread blocks 67 disposed on both sides of the worm wheel 64.

[0065] The worm gear 64 is located in the middle of the bidirectional lead screw 61; the internal thread block 67 is threadedly connected to the bidirectional lead screw 61, and the two internal thread blocks 67 are respectively located in the first receiving groove 14 on the first side mold 11 and the second side mold 12, and the outer wall of the internal thread block 67 is fixedly connected to the inner wall of the corresponding first receiving groove 14.

[0066] The bidirectional lead screw 61 is also connected to two support columns 66, one end of which penetrates the bottom wall of the first receiving groove 14 and is connected to a support plate 65. The second drive source 62 is disposed on the support plate 65, and a reinforcing plate 68 is provided between the two support columns 66. The two support columns 66 are located on both sides of the worm gear 64, and are located between the worm gear 64 and the internal thread block 67.

[0067] In addition, the bidirectional lead screw 61 is also provided with a stop plate 69. Preferably, four stop plates 69 are provided, one at each end of the bidirectional lead screw 61, to prevent the bidirectional lead screw 61 from rotating too much during the outer demolding operation, causing the end of the bidirectional lead screw 61 to enter the first receiving groove 14, which would be detrimental to the next reset operation. A stop plate 69 is provided on each side of the worm gear 64. The stop plate 69 and the worm gear 64 are both provided with reinforcing plates 68, which limit the movement of the worm gear 64 from both sides to prevent the worm gear 64 from shifting.

[0068] This embodiment provides a formwork for a large-span elevated prestressed reinforced concrete box girder. The first side formwork 11 has a first connecting plate 15 at its end, and the second side formwork 12 has a first connecting groove 16 for inserting a second connecting plate 24. The cooperation between the first connecting plate 15 and the first connecting groove 16 not only guides the assembly between the first side formwork 11 and the second side formwork 12, but also ensures the stability of the connection between them.

[0069] The working principle of a prestressed reinforced concrete box girder formwork for a large-span elevated structure in this embodiment is as follows:

[0070] After the box girder is poured and formed, when the external demolding operation is required, the second drive source 62 is started, and the motor drives the worm gear 63 to rotate. Through the meshing relationship between the worm gear 63 and the worm wheel 64, the double-acting screw 61 is driven to rotate. Since the double-acting screw 61 is threadedly connected to the internal thread block 67, and the internal thread block 67 is fixed in the corresponding first receiving groove 14, the sliding fit between the first mating plate 15 and the first mating groove 16 will cause the two internal thread blocks 67 to drive the first side mold 11 and the second side mold 12 to move away from each other, thereby realizing the demolding operation of the first side mold 11 and the second side mold 12 from the box girder.

[0071] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A formwork for a large-span elevated prestressed reinforced concrete box girder, comprising a first side formwork (11) and a second side formwork (12) symmetrically arranged, and a top plate (3) disposed on the first side formwork (11) and the second side formwork (12), characterized in that: The first side mold (11) and the second side mold (12) are provided with receiving grooves (13) on their opposite side walls, and the inner mold (2) is located in the space formed by the two receiving grooves (13); The inner mold (2) includes a first core (21) and a second core (22), and the ends of the first core (21) and the second core (22) that are far apart from each other are connected to end plates (4). The first core (21) and the second core (22) are both provided with an internal demolding mechanism (5). The internal demolding mechanism (5) includes an internally threaded cylinder (51) disposed in the second receiving groove (23) on the corresponding core. The inner cavity of the internally threaded cylinder (51) is threadedly connected to a rotating cylinder (52). The rotating cylinder (52) is connected to a push plate (53) and a first driving assembly (55). The first driving assembly (55) drives the push plate (53) to move telescopically through the rotating cylinder (52). The first drive assembly (55) includes a rotating shaft (551), one end of which is connected to a first drive source (552) disposed on the end plate (4), and the other end extends into the rotating cylinder (52) and engages with the inner wall of the rotating cylinder (52). The rotating cylinder (52) is fitted with an external threaded block (54) that is threaded to the inner wall of the internal threaded cylinder (51). The rotating shaft (551) is provided with a protrusion (553), and the inner wall of the rotating cylinder (52) is provided with a limiting groove (521) that cooperates with the protrusion (553).

2. The formwork for a large-span elevated prestressed reinforced concrete box girder according to claim 1, characterized in that: An external demolding mechanism (6) is provided between the first side mold (11) and the second side mold (12). The external demolding mechanism (6) includes a bidirectional lead screw (61) disposed in a first receiving groove (14) on the first side mold (11) and the second side mold (12). The bidirectional lead screw (61) is connected to a second driving assembly, which drives the bidirectional lead screw (61) to perform threaded transmission with the first side mold (11) and the second side mold (12).

3. The formwork for a large-span elevated prestressed reinforced concrete box girder according to claim 2, characterized in that: The second drive assembly includes a second drive source (62) disposed on a support plate (65), which is connected to a worm wheel (64) on a double-acting screw (61) via a worm (63); the support plate (65) is connected to the double-acting screw (61) via a support column (66).

4. The formwork for a large-span elevated prestressed reinforced concrete box girder according to claim 3, characterized in that: The bidirectional lead screw (61) is fitted with two internal thread blocks (67). The outer peripheral wall of the internal thread block (67) is connected to the inner wall of the corresponding first receiving groove (14), and the inner wall of the internal thread block (67) is provided with internal threads that cooperate with the bidirectional lead screw (61).

5. The formwork for a large-span elevated prestressed reinforced concrete box girder according to claim 4, characterized in that: The first side mold (11) is provided with a first docking plate (15), and the second side mold (12) is provided with a first docking groove (16) into which the first docking plate (15) is inserted; the end of the first core (21) is provided with a second docking plate (24), and the second core (22) is provided with a second docking groove (25) into which the second docking plate (24) is inserted.

6. The formwork for a large-span elevated prestressed reinforced concrete box girder according to claim 5, characterized in that: The end plate (4), the first side mold (11), and the second side mold (12) are all provided with slots (17) for the reinforcing bars (7) to pass through, as well as moving wheels (8) for sliding.

7. A construction method for a reinforced concrete box girder, characterized in that: Construction using the box girder formwork of claim 6 includes the following steps: S1, Casting of box girder Concrete is injected into the assembled template cavity through the feeding port (31) on the top plate (3); S2, Demolding of the inner mold After the box girder is formed, the first drive source (552) is started, and the rotating shaft (551) drives the external thread block (54) to rotate through the rotating cylinder (52). Since the external thread block (54) is threadedly connected to the internal thread cylinder (51), and the internal thread cylinder (51) is fixed in the inner mold (2), the rotating cylinder (52) is forced to move horizontally in the internal thread cylinder (51), so that the two push plates (53) push each other, thereby causing the first core (21) and the second core (22) to move away from each other and separate from the inner wall of the box girder. S3, demolding of the side mold Start the second drive source (62), and drive the bidirectional lead screw (61) to rotate through the meshing worm wheel (64) and worm (63); the bidirectional lead screw (61) drives the first side mold (11) and the second side mold (12) to move away from each other through the internal thread block (67), so that the first side mold (11) and the second side mold (12) are separated from the outer wall of the box girder.

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