A method for floating and launching installation of a sea bridge section based on SPMT

Abstract

The application discloses a kind of offshore bridge section float installation method based on SPMT, the installation method includes the following steps: S1: barge carries bridge section and SPMT reaches the front of installation pier, by dinghy, mooring rope is fixed on pier;S2: barge gradually tightens mooring rope, tail is aimed at the gap between pier;S3: barge winch tail is pulled into the gap between pier, ensure that the tail installation area is enough to accommodate bridge section and SPMT and is fixed using fender and float ball;S4: before installation, remove the bridge section binding, SPMT enters the bridge section below and lifts the bridge section from temporary support, is transported to tail, and is positioned by translation rotation etc. Action carries out bridge section installation position rough positioning.The present application uses SPMT to transport and install bridge section in position, which can achieve millimeter-level fine adjustment, has higher installation precision, reduces the impact of wave impact on barge, ensures the horizontal state of goods when barge is inclined, and reduces the time cost loss caused by bad weather.

Description

Technical Field

[0001] This invention relates to the field of marine bridge engineering technology, and in particular to a method for floating installation of marine bridge sections based on SPMT. Background Technology

[0002] In recent years, sea bridges have played an important role in people's lives, transportation and economic development as an important transportation facility connecting two places across the sea. In sea bridge projects, the installation of bridge sections is a major problem. At present, the main methods for bridge section installation are the use of bridge erecting machines, hoisting method and floating installation method.

[0003] The hoisting method is difficult to use for bridge sections with overhead buildings obstructing the view. Traditional floating installation only uses barges, which is not only highly dependent on weather and tide conditions, but also often results in unexpected costs due to extended operation periods. Furthermore, floating installation is slow, lacks flexibility in adjusting the installation position, and is difficult to handle the installation and alignment of irregularly shaped bridge sections. Therefore, traditional floating installation often requires additional auxiliary equipment such as jacks, which increases preparation time and costs. For this reason, it is necessary to develop a new floating installation method for offshore bridge sections that has higher precision, economy, efficiency, and strong risk resistance. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the current SPMT-based floating installation method for offshore bridge sections, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a method for floating bridge sections at sea based on SPMT, which is suitable for solving the problem that traditional floating bridge installation often requires additional auxiliary equipment such as jacks, which increases preparation time and cost.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for floating bridge section installation based on SPMT, the installation method comprising the following steps:

[0008] S1: The barge carries the bridge section and SPMT to the front of the bridge pier for installation, and the small boat secures the mooring rope to the bridge pier;

[0009] S2: The barge gradually tightens the mooring lines and aligns the stern with the gap between the bridge piers;

[0010] S3: The barge cable pulls the stern into the space between the bridge piers, ensuring that the stern installation area is large enough to accommodate the bridge section and SPMT, and uses fenders and buoys for fixation;

[0011] S4: Before installation, the bridge section is untied. SPMT enters under the bridge section and lifts it from the temporary support. It is then transported to the stern of the ship and the bridge section is roughly positioned by translation and rotation.

[0012] S5: Float installation begins, SPMT is lowered, and precise positioning is achieved in conjunction with ship ballast.

[0013] S6: After the bridge section is installed on the support column, it is lowered by SPMT. The ship's ballast causes SPMT to separate from the bridge section and roll back.

[0014] S7: Loosen the mooring ropes on the bridge piers, and the barge sails out between the piers, completing the bridge section installation.

[0015] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method described in this invention, the barge is a deck barge, and the SPMT and bridge section are temporarily stacked on the deck barge during sea transport. The SPMT is a self-propelled hydraulic modular flatbed truck with a length of 1.4m per axle, a width of 2.43m per column, and a lifting height range of 1.2m-1.8m. The trucks are matched according to the bridge section structure.

[0016] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S1, before mooring the cable, the mooring pier needs to be protected and mooring points need to be prepared. The pier is wrapped with soft slings and straps, and shackles matching the cable specifications are set on it as mooring points.

[0017] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S1, the barge mooring adopts a mooring method of two side cables, two bow cables, and two cross cables at the stern.

[0018] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S3, there must be at least a 1-meter gap between the end of the barge and the end of the SPMT at the installation position. The barge uses a dense D-shaped fender to achieve a larger contact area. Tires are suspended on the bridge piers on both sides of the barge for protection. Floats matching the gap spacing are set between the barge and the bridge piers.

[0019] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S4, the temporary support for stacking the bridge section is a frame placed parallel to the length of the ship. The height of the frame shall not be less than 1.2 meters, and the gap between the frames shall not be less than 3 meters. When the SPMT transports the bridge section to the stern, its height shall be higher than the height of the bridge section installation column. The position of the SPMT shall be adjusted so that the bottom plate of the bridge section is aligned with the installation column on the pier.

[0020] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S5, after the error between the bridge section positioning base plate and the installation column reaches the allowable range, the bridge section is fixed horizontally using pins.

[0021] As a preferred embodiment of the SPMT-based offshore bridge section floating installation method of the present invention, in step S6, when the bridge section is installed on the column, the height of the SPMT should not be less than 1.5 meters to retain lifting margin and avoid the stern of the ship from lifting up due to the loss of the bridge section weight, which would cause the SPMT platform to collide with the bridge deck.

[0022] The beneficial effects of this invention are as follows: In the bridge segment installation based on SPMT, the ramp can be transported via SPMT, the barge does not need to penetrate deep into the pier, the water depth requirement for the working area is low, and it is suitable for installation along the coast. By using SPMT to translate, rotate, and lift the bridge segment, millimeter-level precise adjustment can be achieved. Therefore, the barge does not need to adjust its position during the installation process, which is convenient for installing irregularly shaped bridge segments. The automatic leveling function of SPMT effectively reduces the impact of ship tilting caused by waves on the bridge segment installation operation, relaxes the working conditions for bridge segment installation, and reduces cost losses caused by delays due to weather conditions. The hydraulic lifting system of SPMT and the dual positioning of ship loading can expand the tidal window for installation, and the time is shorter than that of floating installation by a single barge, which is more efficient. The bridge segment installation equipment only uses barges and SPMT, without the need for additional auxiliary equipment such as jacks, and the preparation time and cost are low. The SPMT-based installation process can also be combined with the land transportation and roll-on / roll-off processes of bridge segments. By using SPMT for seamless operation of bridge segment transportation, roll-on / roll-off and installation, the operating cost can be significantly reduced. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1This is a schematic diagram of the overall steps of a SPMT-based offshore bridge section floating installation method proposed in this invention.

[0025] Figure 2 This is a schematic diagram of SPMT and bridge segment being stowed on a barge, according to the SPMT-based offshore bridge segment floating installation method proposed in this invention.

[0026] Figure 3-4 This is a flowchart illustrating the mooring process for a SPMT-based floating bridge section installation method proposed in this invention.

[0027] Figure 5-11 This is a flowchart illustrating the bridge section installation process of a SPMT-based floating bridge section installation method proposed in this invention. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0032] Example

[0033] Reference Figures 1-11 As an embodiment of the present invention, a method for floating overlay installation of offshore bridge sections based on SPMT is provided. The installation method includes the following steps:

[0034] S1: The barge carries the bridge section and SPMT to the front of the bridge pier for installation, and the small boat secures the mooring rope to the bridge pier;

[0035] In step S1, before mooring the piers, the mooring points need to be protected and prepared. The piers are wrapped with soft slings and straps, and shackles matching the specifications of the mooring ropes are set on them as mooring points. The barge is moored using a mooring method of two side cables, two bow cables, and two cross cables at the stern.

[0036] S2: The barge gradually tightens the mooring lines and aligns the stern with the gap between the bridge piers;

[0037] S3: The barge cable pulls the stern into the space between the bridge piers, ensuring that the stern installation area is large enough to accommodate the bridge section and SPMT, and uses fenders and buoys for fixation;

[0038] In step S3, there must be at least a 1-meter gap between the end of the barge and the end of the SPMT at the installation location. The barge uses a dense D-shaped fender to achieve a larger contact area. Tires are suspended on the piers on both sides of the barge for protection. Floats that match the gap spacing are installed between the barge and the piers.

[0039] S4: Before installation, the bridge section is untied. SPMT enters under the bridge section and lifts it from the temporary support. It is then transported to the stern of the ship and the bridge section is roughly positioned by translation and rotation.

[0040] In step S4, the temporary support for stacking bridge sections is a frame placed parallel to the length of the ship. The height of the frame must not be less than 1.2 meters, and the gap between the frames must not be less than 3 meters. When the SPMT transports the bridge section to the stern, its height must be higher than the height of the bridge section installation column. Adjust the position of the SPMT so that the bottom plate of the bridge section is aligned with the installation column on the pier.

[0041] S5: The floating installation begins, the SPMT is lowered, and precise positioning is achieved in conjunction with the ship's ballast; once the error between the bridge section's bottom plate and the installation column reaches the allowable range, pins are used to fix it horizontally.

[0042] S6: After the bridge section is on the installation column, it is lowered by SPMT. The ship's ballast separates the SPMT from the bridge section and moves it back. When the bridge section is on the installation column, the height of SPMT should not be less than 1.5 meters to leave room for lifting and avoid the stern of the ship from lifting due to the loss of the weight of the bridge section, which would cause the SPMT platform to collide with the bridge deck.

[0043] S7: Loosen the mooring ropes on the bridge piers, and the barge sails out between the piers, completing the bridge section installation.

[0044] The barge is a deck barge. During sea transport, SPMTs and bridge sections are temporarily stowed on the deck barge. SPMTs are self-propelled hydraulic modular flatbed trucks with a length of 1.4m per axle, a width of 2.43m per column, and a lifting height range of 1.2m-1.8m. The trucks are matched according to the structure of the bridge sections.

[0045] During operation, the barge arrives at the pier to be installed by approaching it stern-to-stern. Anchor boats guide the barge to anchor. The small boats attach two bow cables and two side cables to the adjacent piers to be installed, and two cross cables are attached to the stern. Before the barge arrives, the piers are protected with soft slings and straps, and mooring points are created using shackles. During installation, tires are suspended from the piers on both sides of the barge for protection, preventing collisions. The barge tightens the cables, pulling the stern between the piers. The bridge section can be moved horizontally using SPMTs; the barge does not need to penetrate deep into the piers, only the stern needs to be at the required water depth. SPMTs then lift bridge section 2 above the installation column. The SPMT is transported to the stern of the ship at a height of [height missing]. Its position is adjusted to align the mounting legs on the cantilever beams on both sides of the bridge section with the mounting columns. The SPMT begins to descend, and ballast is applied to the stern to place the bridge section onto the mounting columns. Pins are used to temporarily secure the ramp and mounting columns. The SPMT continues to descend, and the padding on the platform is removed. Once the SPMT platform is fully separated from bridge section 2, the SPMT is reversed. The SPMT is moved to a position below bridge section 1. After the barge adjusts its position, bridge section 1 is transported to the stern for the next installation step. After the SPMT is reversed, the mooring lines on the piers are released, the barge sails out between the piers, and the fenders on the piers are removed. The bridge section installation is complete.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for floating bridge sections at sea based on SPMT, characterized in that, The installation method includes the following steps: S1: The barge carries the bridge section and SPMT to the front of the bridge pier for installation, and the small boat secures the mooring rope to the bridge pier; S2: The barge gradually tightens the mooring lines and aligns the stern with the gap between the bridge piers; S3: The barge cable pulls the stern into the space between the bridge piers, ensuring that the stern installation area is large enough to accommodate the bridge section and SPMT, and uses fenders and buoys for fixation; S4: Before installation, the bridge section is untied. SPMT enters under the bridge section and lifts it from the temporary support. It is then transported to the stern of the ship and the bridge section is roughly positioned by translation and rotation. S5: Float installation begins, SPMT is lowered, and precise positioning is achieved in conjunction with ship ballast. S6: After the bridge section is installed on the support column, it is lowered by SPMT, and the ship's ballast causes SPMT to separate from the bridge section and roll back. S7: Loosen the mooring ropes on the bridge piers, and the barge sails out between the piers, completing the bridge section installation.

2. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: The barge is a deck barge. During sea transport, SPMTs and bridge sections are temporarily stacked on the deck barge. The SPMT is a self-propelled hydraulic modular flatbed truck with a length of 1.4m per axle, a width of 2.43m per column, and a lifting height range of 1.2m-1.8m. The trucks are matched according to the structure of the bridge sections.

3. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S1, before tying the cable, the pier needs to be protected and the tying point needs to be prepared. The pier is wrapped with soft slings and straps, and shackles matching the cable specifications are set on it as tying points.

4. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S1, the mooring line adopts a mooring method consisting of two side cables, two bow cables, and two cross cables at the stern.

5. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S3, there must be at least a 1-meter gap between the stern of the barge and the end of the SPMT at the installation position. The barge uses a dense D-shaped fender to achieve a larger contact area. Tires are suspended on the piers on both sides of the barge for protection. Floats matching the gap spacing are installed between the barge and the piers.

6. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S4, the temporary supports for the stacking bridge section are jigs placed parallel to the ship's length direction. The height of the jigs must not be less than 1.2 meters, and the gap between the jigs must not be less than 3 meters. The SPMT transport bridge section is then transported to... When the stern is positioned, its height must be higher than the height of the column installed on the bridge section. Adjust the position of the SPMT (Special Purpose Mounting Tool) to align the bottom plate of the bridge section with the column installed on the pier.

7. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S5, after the error between the bridge section positioning base plate and the installation column reaches the allowable range, they are fixed horizontally using pins.

8. The method for floating bridge section installation based on SPMT according to claim 1, characterized in that: In step S6, when the bridge section is installed on the column, the height of the SPMT should not be less than 1.5 meters to reserve lifting margin and avoid the stern of the boat from lifting up due to the loss of the weight of the bridge section, which would cause the SPMT platform to collide with the bridge panel.

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