Method for assembling mobile formwork in a marine environment and use thereof

Abstract

The application provides a method for assembling a movable formwork in a sea area and application thereof, and belongs to the technical field of offshore highway bridge construction. A first branch trestle and a second branch trestle connected with a main trestle are constructed at a planned assembly position, four temporary support piers are arranged between the two branch trestles, a pushing oil cylinder and a sliding support are arranged on the temporary support piers, a first crawler crane is arranged on the first branch trestle, a second crawler crane is arranged on the second branch trestle, the front nose beam is hoisted to the temporary support piers through the cooperation of the first crawler crane and the second crawler crane, and then the formwork main longitudinal beam is installed in a segmented and sectional pushing mode; after the formwork main longitudinal beam is assembled, the rear nose beam is assembled through the first crawler crane; finally, the installation of the cross beam on the formwork main longitudinal beam and the installation of the formwork device are completed. The assembly method can realize the assembly of the movable formwork in the sea area, and then realize the multi-point synchronous construction of the offshore highway bridge, greatly improves the construction efficiency and shortens the construction period.

Description

Technical Field

[0001] This invention belongs to the field of marine highway bridge construction technology, specifically relating to a method for assembling mobile formwork in the sea and its application. Background Technology

[0002] Downward-moving formwork is a large-scale equipment used in highway bridge construction. Its working principle is to use bridge piers and abutments as support points, and to support the formwork, beam weight and various construction loads through the main beam. Crossbeams are installed at equal intervals on the upper part of the main beam to increase the overall integrity and provide a formwork operation platform. This technology has the advantages of simple construction procedures, short construction period and continuous construction. In addition, it does not require the setting of formwork supports under the bridge, and does not affect traffic and navigation under the bridge during construction.

[0003] For the construction of sea-bound highway bridges, the assembly of mobile formwork is usually completed on land (i.e., the mobile formwork is transported to the ground-based starting section of the sea-bound highway bridge and assembled using cranes on the leveled roadbed site), and then the construction gradually proceeds from the ground-based starting section towards the sea to complete the construction of the sea-bound highway bridge. However, this construction method is a single-line sequential construction (i.e., construction gradually proceeds from the ground-based starting section towards the sea), which restricts the construction progress. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for assembling mobile formwork in the sea and its application. This assembly method can realize the assembly of mobile formwork in the sea, thereby enabling multi-point synchronous construction of marine highway bridges, greatly improving construction efficiency and shortening the construction cycle.

[0005] This invention is achieved through the following technical solution:

[0006] A method for assembling a mobile formwork in a sea area includes the following steps:

[0007] Step 1: Construct the first and second trestle bridges at the planned assembly points to connect with the main trestle bridge;

[0008] Step 2: Construct four temporary supports between the first and second trestle bridges. Two of the temporary supports are located inside the first trestle bridge and are symmetrically positioned on the left and right sides of the rear pier. The other two temporary supports are located inside the second trestle bridge and are symmetrically positioned on the left and right sides of the front pier. Install jacking cylinders and sliding supports on the temporary supports.

[0009] Step 3: The first crawler crane on the first trestle bridge will install the support leg next to the pier on the rear side of the bridge pier, and the second crawler crane on the second trestle bridge will install the support leg next to the pier on the front side of the bridge pier; then the moving trolley will be hoisted onto the support leg next to the pier.

[0010] Step 4: Assemble the front nose beam on the main trestle bridge, and then use the first crawler crane and the second crawler crane to work together to lift the assembled front nose beam onto the temporary support.

[0011] Step 5: Use the first crawler crane to lift the first section of the main longitudinal beam of the formwork from the main trestle to the support leg next to the pier of the rear pier and the temporary support pier inside the first trestle, and connect the first end of the first section of the main longitudinal beam of the formwork to the tail end of the front nose beam.

[0012] Step 6: Drive the front nose beam and the first section of the main longitudinal beam of the formwork frame forward by using the longitudinal movement cylinder on the temporary support to make room for the installation of the next section of the main longitudinal beam of the formwork frame. Then install the next section of the main longitudinal beam of the formwork frame until the installation of the entire main longitudinal beam of the formwork frame is completed.

[0013] Step 7: Use the first crawler crane to splice the rear nose beam to the tail end of the main longitudinal beam of the formwork; then, use the first crawler crane and the second crawler crane to complete the installation of the crossbeams and formwork devices on the main longitudinal beam of the formwork.

[0014] In the above technical solution, the main trestle extends from the ground to the sea area, and is arranged on the side of the bridge pier, with the main trestle and the bridge pier arranged in a parallel direction.

[0015] In the above technical solution, the first trestle is located inside the rear pier of the two adjacent piers at the planned assembly point, and the second trestle is located inside the front pier of the two adjacent piers; the first trestle and the second trestle are arranged in parallel to each other, and both the first trestle and the second trestle are perpendicular to the front and rear arrangement direction of the piers.

[0016] In the above technical solution, a construction platform is laid on the first and second trestle bridges to provide a construction platform for construction equipment and personnel.

[0017] In the above technical solution, a third trestle is provided, which is located between the first and second trestles and is parallel and close to the main trestle. The stability of the first and second trestles is increased by the third trestle, and the width of the main trestle is widened, which can provide a larger working platform space.

[0018] In the above technical solution, in step 3, the bottom of the pier-side support leg is supported on the abutment at the bottom of the pier. Any uneven areas on the top surface of the abutment are ground down and shims of steel wire rubber are added to ensure the stability of the pier-side support leg. After the pier-side support leg is installed, a stabilizing beam is installed on the top of the pier-side support leg so that the four pier-side support legs around a single pier are stably connected together as a support foundation.

[0019] In the above technical solution, step 4, the method for the first crawler crane and the second crawler crane to work together is as follows:

[0020] Step 4.1: The first tracked crane and the second tracked crane move to the inside of the first and second trestle bridges; the first tracked crane connects to the rear end of the front nose bridge, and the second tracked crane connects to the front end of the front nose bridge.

[0021] Step 4.2: The first crawler crane and the second crawler crane rotate at a set angle toward the rear pier, so that the front nose beam shifts toward its rear side, so that a sufficient gap is formed between the front end of the front nose beam and the body of the second crawler crane.

[0022] Step 4.3: The first crawler crane remains stationary, while the second crawler crane continues to rotate, moving the front end of the bridge pier towards the bridge pier.

[0023] Step 4.4: Both the first and second crawler cranes rotate toward the pier so that the front end of the nose beam passes over the second crawler crane;

[0024] Step 4.5: The second crawler crane remains stationary, while the first crawler crane continues to rotate, causing the tail end of the front nose beam to move towards the pier and around the first crawler crane;

[0025] Step 4.6: The first crawler crane and the second crawler crane move outwards towards the first and second trestle bridges, moving the front nose bridge to the temporary support position and placing the front nose bridge on the two opposite temporary supports.

[0026] Step 4.7: Drive the front nose beam forward by pushing the hydraulic cylinder on the temporary support, so that the tail end of the front nose beam is in the middle position of the top of the temporary support inside the first trestle bridge, thereby reserving half of the space at the top of the temporary support for supporting the main longitudinal beam of the formwork to be hoisted later.

[0027] In the above technical solution, during the assembly process, the electro-hydraulic system is installed synchronously with each component.

[0028] In the above technical solution, the length of the posterior nasal bridge is less than half the length of the anterior nasal bridge.

[0029] Furthermore, by applying the method of assembling mobile formwork in the sea area, multi-point synchronous construction of marine highway bridges can be achieved: including assembling a mobile formwork at the ground starting section of the marine highway bridge and carrying out construction in the direction of the sea; and also including assembling another mobile formwork at at least one location on the planned construction path of the marine highway bridge in the sea area using the assembly method designed in this invention, and carrying out construction simultaneously, thereby achieving multi-point synchronous construction of marine highway bridges.

[0030] The advantages and beneficial effects of this invention are as follows:

[0031] This invention provides an assembly method for assembling mobile formwork in marine environments. By constructing temporary supports, the lifting weight of individual components and the overall lifting weight are reduced. The front nose beam, main longitudinal beam, and rear nose beam are lifted in sections. A trestle bridge is erected between two adjacent piers to ensure that lifting work can be carried out on both sides of the pier. This invention solves the problem of assembling mobile formwork in marine environments by using narrower temporary trestle bridges and temporary supports. It is simple to operate, safe and reliable, and reduces equipment investment costs. It not only saves costs but also has significant effects on energy conservation, emission reduction, and environmental protection.

[0032] The method for assembling mobile formwork in the sea area using the present invention can realize multi-point synchronous construction of marine highway bridges: it includes setting up a mobile formwork at the ground starting section of the marine highway bridge and carrying out construction in the direction of the sea; it also includes setting up another mobile formwork at at least one location on the planned construction path of the marine highway bridge in the sea area using the assembly method designed in the present invention, and carrying out construction simultaneously, thereby realizing multi-point synchronous construction of marine highway bridges. Attached Figure Description

[0033] Figure 1 This is a front view of a downward-moving formwork (the crossbeams and formwork devices are not shown in the figure).

[0034] Figure 2 This is a top view of a downward-moving formwork (the crossbeams and formwork devices are not shown in the figure).

[0035] Figure 3 This is a side view of a downward-moving formwork.

[0036] Figure 4 This is a schematic diagram illustrating the construction status of steps 1 and 2 of the method for assembling a mobile formwork in the sea area designed according to the present invention.

[0037] Figure 5 This is a top-view schematic diagram of the construction state of step 3 in the method for assembling a mobile formwork in the sea area designed according to the present invention.

[0038] Figure 6 This is a front view schematic diagram of the construction state of step 3 in the method for assembling a mobile formwork in the sea area designed in this invention.

[0039] Figure 7 This is a schematic diagram of the construction status of step 4.1 of the method for assembling a mobile formwork in the sea area designed for this invention.

[0040] Figure 8 This is a schematic diagram of the construction status of step 4.2 of the method for assembling a mobile formwork in the sea area designed in this invention.

[0041] Figure 9This is a schematic diagram of the construction status of step 4.3 of the method for assembling a mobile formwork in the sea area designed in this invention.

[0042] Figure 10 This is a schematic diagram of the construction status of step 4.4 of the method for assembling a mobile formwork in the sea area designed according to the present invention.

[0043] Figure 11 This is a schematic diagram of the construction status of step 4.5 of the method for assembling a mobile formwork in the sea area designed in this invention.

[0044] Figure 12 This is a schematic diagram of the construction status of step 4.6 of the method for assembling a mobile formwork in the sea area designed for this invention.

[0045] Figure 13 This is a schematic diagram of the construction status of step 4.7 of the method for assembling a mobile formwork in the sea area designed for this invention.

[0046] Figure 14 This is a top-view schematic diagram of the construction state of step 5 in the method for assembling a mobile formwork in the sea area designed according to the present invention.

[0047] Figure 15 This is a front view schematic diagram of the construction state of step 5 in the method for assembling a mobile formwork in the sea area designed in this invention.

[0048] Figure 16 This is a front view schematic diagram of step 6 of the method for assembling a mobile formwork in the sea area designed in this invention, showing the construction status.

[0049] Figure 17 This is a front view schematic diagram of step 7 of the method for assembling a mobile formwork in the sea area designed in this invention, showing the construction status.

[0050] Figure 18 This is a schematic diagram of the moving mold frame after it has moved forward through the hole. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0052] This invention presents a method for assembling a mobile formwork in marine environments. First, the basic structure of a navigable mobile formwork is described. (See appendix) Figure 1 - Appendix Figure 3 The downward-moving formwork includes a formwork body, a transfer trolley for driving the formwork body to move, and a lower support system.

[0053] The main body of the formwork includes two parallel main longitudinal beams 100, which are located on the left and right sides of the pier 200. A front nose beam 300 is connected to the front end of the main longitudinal beam 100, and a rear nose beam 400 is connected to the rear end of the main longitudinal beam 100. A crossbeam 500 (multiple crossbeams are arranged at intervals) is connected between the two main longitudinal beams 100. A formwork device 600 is set on the crossbeam 500. During construction, concrete is poured into the formwork to form the box girder of the bridge.

[0054] The lower support system includes pier-side support legs 700, stabilizing beams 800, and corbels 900. The pier-side support legs 700 are supported on the bottom abutment of the pier 200. A set of pier-side support legs 700 is provided on both the front and rear sides of the pier 200. Each set of pier-side support legs 700 includes two symmetrically arranged pier-side support legs 700. Each pier-side support leg 700 has a vertical leg 701 at its bottom. The vertical legs 701 of adjacent pier-side support legs 700 are connected by connecting components 702, and the tops of two adjacent pier-side support legs 700 are connected by stabilizing beams 800, thus stably connecting the four pier-side support legs 700 together as a support foundation. The corbels 900 are supported at the bottom on the pier-side support legs 700, and the corbels 900 support the main body of the formwork, allowing for adjustment of the height of the main body of the formwork. Preferably, the corbels 900 are located inside the main longitudinal beam 100 of the formwork, and the top of the corbels 900 is connected to the support point inside the main longitudinal beam 100 of the formwork.

[0055] The shifting trolley 1000 is mounted on the pier-side support leg 700 of the lower support system and is used to drive the movement of the formwork body. When the formwork is in the construction state, the corbel 900 supports the formwork body; when the formwork needs to be moved, the corbel 900 retracts, causing the formwork body to descend. After the formwork body descends to its position, the shifting trolley 1000 supports the formwork body and drives the formwork body to move through the drive cylinder on the shifting trolley 1000.

[0056] The following describes in detail the method for assembling a mobile formwork in the sea area according to the present invention, including the following steps.

[0057] Step 1: Construct the main trestle bridge 10, and construct two branch trestle bridges connected to the main trestle bridge 10 at the planned assembly point, namely, the first branch trestle bridge 11 and the second branch trestle bridge 12.

[0058] For details, please see the appendix. Figure 4The main trestle 10 extends from the ground to the sea and is positioned on the side of the piers, parallel to the front-to-back arrangement of the piers (the front-to-back arrangement of the piers can be understood as the direction of the line connecting adjacent piers). The first trestle 11 is located inside the rear pier 201 of two adjacent piers at the planned assembly location, and the second trestle 12 is located inside the front pier 202 of the same two adjacent piers. The first trestle 11 and the second trestle 12 are arranged parallel to each other, and both are perpendicular to the front-to-back arrangement of the piers. Construction platforms are laid on the first trestle 11 and the second trestle 12 to provide platforms for construction equipment and personnel.

[0059] Furthermore, preferably, a third trestle 13 can be provided, which is positioned between the first trestle 11 and the second trestle 12, and parallel and close to the main trestle 10. The third trestle 13 increases the stability of the first trestle 11 and the second trestle 12, and widens the main trestle 10, providing a larger working platform space.

[0060] Step 2: See Appendix Figure 4 Four temporary supports 2 are installed between the first trestle bridge 11 and the second trestle bridge 12. Two temporary supports 2 form the first group, located close to the inner side of the first trestle bridge 11, and are symmetrically positioned on the left and right sides of the rear pier 201. The other two temporary supports 2 form the second group, located close to the inner side of the second trestle bridge 12, and are symmetrically positioned on the left and right sides of the front pier 202. Then, a jacking cylinder and a sliding support are installed on each temporary support 2.

[0061] Step 3: As Figure 5 and attached Figure 6 As shown, two crawler cranes travel along the main trestle 10 to the first trestle 11 and the second trestle 12 respectively. The first crawler crane 31 on the first trestle 11 installs the pier support leg 700 of the rear pier 201, and the second crawler crane 32 on the second trestle 12 installs the pier support leg 700 of the front pier 202.

[0062] Furthermore, the bottom of the pier-side support leg 700 is supported on the abutment at the bottom of the pier. Any uneven areas on the top surface of the abutment are ground down and padded with 2cm steel wire rubber plates to ensure the stability of the pier-side support leg 700.

[0063] After the pier-side support leg 700 is installed, a stabilizing beam 800 is installed on top of the pier-side support leg 700, so that the four pier-side support legs 700 around a single pier are stably connected together as a support foundation; then the shifting trolley 1000 is hoisted onto the pier-side support leg 700.

[0064] Step 4: Assemble the front nose beam 300 on the main trestle bridge 10, and then use the first crawler crane 31 and the second crawler crane 32 to work together to lift the assembled front nose beam 300 onto the temporary support 2.

[0065] For details, please see the appendix. Figure 7 - Appendix Figure 13 The method for the coordinated operation of the first crawler crane 31 and the second crawler crane 32 is as follows:

[0066] Step 4.1: See Appendix Figure 7 The first tracked crane 31 and the second tracked crane 32 move to the inside of the first trestle bridge 11 and the second trestle bridge 12 (the inside refers to the side closer to the main trestle bridge 10); the first tracked crane 31 is connected to the rear end of the front nose bridge 300, and the second tracked crane 32 is connected to the front end of the front nose bridge 300.

[0067] Step 4.2: See Appendix Figure 8 The first crawler crane 31 and the second crawler crane 32 rotate at a set angle toward the rear pier 201, causing the front nose beam 300 to shift toward its rear side, so that a sufficient gap is formed between the front end of the front nose beam 300 and the body of the second crawler crane 32.

[0068] Step 4.3: See Appendix Figure 9 The first crawler crane 31 remains stationary, while the second crawler crane 32 continues to rotate, causing the front end of the nose beam 300 to move towards the pier.

[0069] Step 4.4: See Appendix Figure 10 Both the first crawler crane 31 and the second crawler crane 32 rotate toward the pier, so that the front end of the nose beam 300 passes around the second crawler crane 32.

[0070] Step 4.5: See Appendix Figure 11 The second crawler crane 32 remains stationary, while the first crawler crane 31 continues to rotate, causing the tail end of the front nose beam 300 to move toward the pier and around the first crawler crane 31.

[0071] Step 4.6: See Appendix Figure 12 The first tracked crane 31 and the second tracked crane 32 move outwards towards the first trestle bridge 11 and the second trestle bridge 12, moving the front nose bridge 300 to the position of the temporary support 2, and placing the front nose bridge 300 on the two opposite temporary supports 2.

[0072] Step 4.7: See Appendix Figure 13 The front nose beam 300 is driven to move forward by the jacking cylinder on the temporary support 2, so that the tail end of the front nose beam 300 is in the middle position of the top of the temporary support 2 inside the first support bridge 11, thereby reserving half of the space 210 at the top of the temporary support 2 for subsequent support of the main longitudinal beam of the formwork to be hoisted.

[0073] Step 5: See Appendix Figure 14 - Appendix Figure 15 The first section of the main longitudinal beam 101 of the formwork frame is installed (the main longitudinal beam 100 of the formwork frame is divided into N sections and installed one by one. In this embodiment, the entire main longitudinal beam 100 of the formwork frame is divided into 4 sections): the first section of the main longitudinal beam 101 of the formwork frame is hoisted from the main trestle bridge 10 to the pier-side support leg 700 of the rear pier 201 and the temporary support pier 2 inside the first trestle bridge 11 by the first crawler crane 31, and the first end of the first section of the main longitudinal beam 101 of the formwork frame is connected to the tail end of the front nose beam 300.

[0074] Step 6: Using the longitudinal movement cylinder 21 on the temporary support 2 (see appendix) Figure 15 The front nose beam 300 and the first section of the main longitudinal beam 101 of the mold frame are moved forward to make room for the installation of the next section of the main longitudinal beam of the mold frame. Then, the next section of the main longitudinal beam 102 of the mold frame is installed (see appendix). Figure 16 Repeat the above steps until the installation of the entire main longitudinal beam of the formwork is complete.

[0075] Step 7: As Figure 17 As shown, after the main longitudinal beam of the formwork is assembled, the rear nose beam 400 is hoisted from the main trestle 10 to the tail end of the main longitudinal beam of the formwork and connected using the first crawler crane 31. Then, the installation of the crossbeam 500 and the formwork device 600 on the main longitudinal beam of the formwork is completed using the first crawler crane 31 and the second crawler crane 32.

[0076] Furthermore, during the assembly process, the electro-hydraulic system is installed synchronously with each component.

[0077] Furthermore, after the assembly is completed, the movable formwork is thoroughly inspected. Once no problems are found, the first section of pouring construction can proceed.

[0078] Furthermore, the length of the rear nose bridge 400 is less than half the length of the front nose bridge 300. This is because the rear nose bridge 400 is hoisted independently by the first crawler crane 31. Therefore, if the length and weight of the rear nose bridge 400 are too large, the first crawler crane 31 will find it difficult to hoist it independently. However, when the moving formwork moves forward through the hole (i.e., the entire formwork is moved forward by one pier position to facilitate the next section of pouring construction; "hole" here refers to the span or bridge span space between piers, and the space between one pier and the next pier is a "hole"), the total length of the front nose bridge 300 and the rear nose bridge 400 needs to be sufficient to support the span in order to enable the moving formwork to move forward through the hole. Therefore, in this invention, the front nose bridge 300 is made to a relatively long length (the front nose bridge 300 is hoisted by two crawler cranes during installation, thus allowing for a longer length), while the rear nose bridge 400 is made to a relatively short length. The total length of the front nose bridge 300 and the rear nose bridge 400 meets the span requirement of the moving mold frame's forward movement through the hole (see appendix). Figure 18 (This is a schematic diagram of the moving mold frame after it has moved forward through the hole).

[0079] The method of assembling mobile formwork in the sea area can be used to achieve multi-point synchronous construction of marine highway bridges: it includes assembling a mobile formwork at the ground starting section of the marine highway bridge and carrying out construction in the direction of the sea; it also includes assembling another mobile formwork at at least one position on the planned construction path of the marine highway bridge in the sea area using the assembly method designed in this invention, and carrying out construction simultaneously, thereby achieving multi-point synchronous construction of marine highway bridges.

[0080] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0081] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0082] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A method for assembling a mobile formwork in a sea area, characterized in that, Includes the following steps: Step 1: Construct the first and second trestle bridges at the planned assembly points to connect with the main trestle bridge; Step 2: Construct four temporary supports between the first and second trestle bridges. Two of the temporary supports are located inside the first trestle bridge and are symmetrically positioned on the left and right sides of the rear pier. The other two temporary supports are located inside the second trestle bridge and are symmetrically positioned on the left and right sides of the front pier. Install jacking cylinders and sliding supports on the temporary supports. Step 3: The first crawler crane on the first trestle bridge installs the support leg next to the pier on the rear side, and the second crawler crane on the second trestle bridge installs the support leg next to the pier on the front side; then the moving trolley is hoisted onto the support leg next to the pier. Step 4: Assemble the front nose beam on the main trestle bridge, and then use the first and second crawler cranes working together to lift the assembled front nose beam onto the temporary support. In step 4, the method for the first and second crawler cranes to work together is as follows: Step 4.1: The first tracked crane and the second tracked crane move to the inside of the first and second trestle bridges; the first tracked crane connects to the rear end of the front nose bridge, and the second tracked crane connects to the front end of the front nose bridge. Step 4.2: The first crawler crane and the second crawler crane rotate at a set angle toward the rear pier, so that the front nose beam shifts toward its rear side, so that a sufficient gap is formed between the front end of the front nose beam and the body of the second crawler crane. Step 4.3: The first crawler crane remains stationary, while the second crawler crane continues to rotate, moving the front end of the bridge pier towards the bridge pier. Step 4.4: Both the first and second crawler cranes rotate toward the pier so that the front end of the nose beam passes over the second crawler crane; Step 4.5: The second crawler crane remains stationary, while the first crawler crane continues to rotate, causing the tail end of the front nose beam to move towards the pier and around the first crawler crane; Step 4.6: The first crawler crane and the second crawler crane move outwards towards the first and second trestle bridges, moving the front nose bridge to the temporary support position and placing the front nose bridge on the two opposite temporary supports. Step 4.7: Drive the front nose beam forward by pushing the hydraulic cylinder on the temporary support, so that the tail end of the front nose beam is in the middle of the top of the temporary support inside the first trestle bridge, so that half of the space at the top of the temporary support is reserved for supporting the main longitudinal beam of the formwork to be hoisted later. Step 5: Use the first crawler crane to lift the first section of the main longitudinal beam of the formwork from the main trestle to the support leg next to the pier of the rear pier and the temporary support pier inside the first trestle, and connect the first end of the first section of the main longitudinal beam of the formwork to the tail end of the front nose beam. Step 6: Drive the front nose beam and the first section of the main longitudinal beam of the formwork frame forward by using the longitudinal movement cylinder on the temporary support to make room for the installation of the next section of the main longitudinal beam of the formwork frame. Then install the next section of the main longitudinal beam of the formwork frame until the installation of the entire main longitudinal beam of the formwork frame is completed. Step 7: Use the first crawler crane to splice the rear nose beam to the tail end of the main longitudinal beam of the formwork; then complete the installation of the crossbeams and formwork devices on the main longitudinal beam of the formwork.

2. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: The main pier extends from the ground into the sea and is located on the side of the bridge pier, with the main pier and the bridge pier arranged in a parallel direction.

3. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: The first trestle is located inside the rear pier of the two adjacent piers at the planned assembly site, and the second trestle is located inside the front pier of the two adjacent piers; the first and second trestle are arranged parallel to each other, and both the first and second trestle are perpendicular to the front and rear arrangement direction of the piers.

4. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: Construction platforms were laid on the first and second trestle bridges.

5. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: A third trestle bridge is provided, which is located between the first and second trestle bridges and is parallel and close to the main trestle bridge.

6. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: In step 3, uneven areas on the top surface of the pier cap are ground down and shims of steel wire rubber are added. After the pier side support legs are installed, a stabilizing beam is installed on top of the pier side support legs to stably connect the four pier side support legs around a single pier.

7. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: During assembly, the electro-hydraulic system is installed synchronously with each component.

8. The method for assembling a mobile formwork in the sea area according to claim 1, characterized in that: The length of the back of the nose is less than half the length of the front of the nose.

9. The application of the method for assembling a mobile formwork in the sea area as described in claim 1, characterized in that: This includes assembling a mobile formwork at the ground-based starting section of the sea-bound highway bridge and carrying out construction towards the sea; it also includes assembling another mobile formwork at at least one location along the planned construction path of the sea-bound highway bridge and carrying out construction simultaneously.

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