Method for lengthening and transporting bridge body to sea

Abstract

The invention provides a method for extending, moving and transporting a bridge beam body to the sea, and relates to the technical field of bridge beam body construction, the mode of extending, moving and transporting the bridge beam body to the sea is adopted, beam body extending equipment is simple, convenient to assemble and disassemble, clear in stress and capable of being recycled, and the mode that a module vehicle is matched with a supporting bracket to support beam ends to move beams is high in construction efficiency and safe and stable in structure. The device can be suitable for transporting bridge bodies with different lengths and weights to the sea, is wide in application range, and has high popularization value.

Description

Technical Field

[0001] The invention relates to the technical field of bridge beam construction, and in particular to a method for extending and transporting a bridge beam to the sea. Background Art

[0002] Prefabricated cross-sea bridges are a type of bridge widely used in cross-sea projects. They are characterized by prefabricating bridge components in factories and then transporting them to the site for assembly or erection. Their main features include fast construction speed, controllable quality, and little impact on the marine environment. Prefabricated components can be mass-produced in factories, which can greatly improve construction efficiency and shorten construction periods. At the same time, prefabrication technology helps to improve the quality of bridges and reduce errors in on-site construction. With the advancement of science and technology and the continuous innovation of construction technology, the application scope of prefabricated cross-sea bridges will become more and more extensive.

[0003] In coastal areas, there are many cross-sea bridges under construction, and large bridge prefabrication sites need to be used for multiple projects. In order to meet the requirements of prefabrication, transportation, and seagoing of prefabricated beams of different spans and weights, prefabrication sites need to be continuously upgraded and renovated. The construction of the sea-going dock for prefabricated beams in the prefabrication site is difficult and requires a large one-time investment. The construction involves relevant approvals from the maritime and water conservancy departments, and has a great impact on the waterway and marine environment. Existing docks are generally used. The existing dock structure type and the spacing between the sea-going piers are fixed, and the load level is low. In order to meet the requirements of the load and span of large prefabricated beams for dock beam movement, the existing dock type is used. Traditional transporters and rail trolley beam movement methods are difficult to meet the construction requirements.

[0004] Conventional sea-going wharfs are double-pier H-type wharfs, with fixed wharf structure and sea-going pier spacing and low load levels. The tire spacing of the transporter beam shifting method is fixed and needs to be consistent with the spacing of the sea-going wharf. If the length of the precast beam is lengthened, it will exceed the spacing between the wharf and the transport tires, and the operation cannot be carried out. After the weight of the precast beam increases, the conventional transporter cannot meet the lifting requirements, and a new large transporter is required to cooperate with the hoisting equipment for lifting, which has high safety risks; the length of the precast beam in the rail trolley beam shifting method must be greater than the wharf spacing, and the beam end is supported on both sides of the wharf to shift the beam. It is a four-point support beam shifting method with a large support load and high requirements for the load level of the existing wharf; the modular car beam shifting method is a beam end support method. The modular car supports the precast beam on the double trestles. The beam length is greater than the wharf spacing and can be directly shifted. If the beam length is shorter than the wharf spacing, the end of the precast beam needs to be extended to temporarily support the beam shifting. The direct extension of the beam end of the concrete beam and the steel-concrete composite beam requires a steel-concrete combined end extension, which has high construction costs and complex processes. Summary of the invention

[0005] In response to the above-mentioned prior art, the present invention proposes a method for extending and transporting bridge beams to the sea, which adopts the method of installing extension equipment at the ends of the bridge beams, and cooperating with a modular vehicle to transport the prefabricated beams to the sea in cooperation with a supporting bracket. The method effectively solves the problem of the short length of the bridge beams and the requirement for the spacing between existing seagoing piers, and the heavy weight of the bridge beams and the high load level requirement of the existing piers. The method has a safe and reliable structure and a wide range of applications.

[0006] The present invention provides a method for extending and transporting a bridge beam to the sea, comprising the following steps: Step 1: After the bridge beam is prefabricated, it is stored on a temporary beam storage pedestal in the prefabrication yard, and the beam extension equipment is installed, including installing cantilever beams at the upper ends of both sides of the bridge beam through cables, installing bottom support beams at the lower ends of both sides of the bridge beam, and using temporary pads to compact the bridge beam and the inner side of the cantilever beam and the bottom support beam, and a cantilever beam is arranged on the outer side of the cantilever beam; Step 2: Two modular vehicles carrying support brackets enter the bottom of the cantilever beams on both sides respectively, and complete the force system conversion through the height adjustment of the modular vehicle itself and the cooperation of the jack, and temporarily connect the support bracket with the cantilever beam. The modular vehicle transports the bridge beam through the beam extension equipment and drives towards the seaward trestle; Step 3: The module vehicle transports the bridge beam to the temporary beam storage pedestal at the wharf through the seagoing trestle. After the beam is dropped to the beam storage point, the connection between the support bracket and the cantilever beam is released, and the module vehicle returns to the beam yard with the support bracket; Step 4: lower the bottom support beam to the temporary beam storage pedestal at the wharf, and remove the cables, cantilever beams, and temporary pads; Step 5: The transport-erection integrated vessel is anchored to the bottom of the beam at a suitable tide level to take out the beam. The bottom supporting beam is lifted off only after the bridge beam body is taken away.

[0007] Preferably, in step 1, the cantilever beam is configured as a large-scale steel structure, the cantilever beam body serves as a temporary supporting end, the temporary pad serves as a pressure-bearing end, the middle part of the cantilever beam and the bottom supporting beam are anchored on the bridge beam body by cables, the cables pass through the bridge beam body by opening temporary holes, the middle part of the cantilever beam adopts a heightened section method, and the anchoring part of the cables is reinforced by stiffening plates and partitions.

[0008] Preferably, in step 1, the bridge beam is stored on a temporary beam storage pedestal in a prefabrication yard through a one-way sliding bearing, the one-way sliding bearing is used to meet the expansion and contraction displacement of the bridge beam under the influence of temperature, the temporary beam storage pedestal in the prefabrication yard includes a reinforced concrete column, a pedestal is provided at the lower end of the reinforced concrete column, and a PHC pipe pile is provided at the lower end of the pedestal.

[0009] Preferably, in step 2, the support bracket adopts a steel column structure, is fixed to the upper end of the module vehicle through a base, and the cantilever beam body is supported by a rubber pad on the top and is temporarily connected with bolts.

[0010] Preferably, in step 4, the cantilever beam is removed by cooperating with a crawler crane to release the cable anchoring system, and the bottom supporting beam is lowered to the upper end of the temporary beam storage pedestal at the dock through a wire rope. The crawler crane lifts the bottom supporting beam, cantilever beam, and cable onto the module vehicle, and brings them back to the prefabricated beam yard for reuse.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. The beam extension equipment of the present invention adopts a cantilever beam, cable, bottom support beam, and temporary pad structure. One end of the cantilever beam is suspended from the beam body as the extension end, and the other end is anchored to the upper part of the bridge beam body through the cable and the bottom support beam. This extension anchoring method only puts pressure on the bridge beam body, but has good force on the main structure, and the structure has clear force transmission, which is safe and reliable. The extension equipment is an assembled structure, which is easy to install and disassemble, flexible to use, and can be used repeatedly.

[0012] 2. The beam extension of the present invention uses two modular vehicles to cooperate with the support bracket to move the beam body, and the upper and lower parts of the support bracket are respectively connected and fixed with the modular vehicle and the cantilever beam. The modular vehicle is assembled and can be assembled according to the weight of the bridge beam body. The modular vehicle has multi-condition travel, hydraulic lifting, multi-directional steering, and lifting and lowering adjustment functions. The two modular vehicles can be used to move the beams at sea terminals with different spans and spacings, and are flexible to use.

[0013] 3. The existing sea-going dock of the present invention can be used repeatedly. The modular vehicle can move the bridge beam on the double pier. If the beam length is longer than the dock spacing, the beam can be moved directly. If the beam length is shorter than the dock spacing, the beam segment lengthening method of the present invention can be used to move the beam. It can be suitable for moving bridge beams of different lengths out to sea. The uniformly loaded beam on the upper part of the modular vehicle can evenly distribute the beam weight under the wheel pressure, and can convert the beam moving point load into a long-line load. The load bearing capacity of the dock is low, and the heavy bridge beam can be moved out to sea using the sea-going dock with a lower load level.

[0014] 4. The present invention adopts a method of extending the beam body and transporting it to the sea. The beam end extension structure is simple, installation and disassembly are convenient, the force is clear, and it can be used in a turnover manner. The modular vehicle cooperates with the supporting bracket to support the beam end and move the beam. The construction efficiency is high, the structure is safe and stable, and it can be adapted to the transportation of bridge beams of different beam lengths and beam weights to the sea. It has a wide range of applications and high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a construction schematic diagram of installing the beam extension equipment in an embodiment of the present invention.

[0016] Figure 2 It is a construction schematic diagram of the module vehicle entering the construction site in an embodiment of the present invention.

[0017] Figure 3 It is a construction schematic diagram of the module vehicle leaving the site in an embodiment of the present invention.

[0018] Figure 4 It is a construction schematic diagram of dismantling the beam extension equipment in an embodiment of the present invention.

[0019] Figure 5 It is a construction schematic diagram of the transport-frame integrated vessel entering the construction site in an embodiment of the present invention.

[0020] In the figure, 1-bridge beam; 2-cantilever beam; 3-cable; 4-bottom supporting beam; 5-temporary beam storage pedestal in prefabrication yard; 6-temporary pad; 7-ground line; 8-module vehicle; 9-support bracket; 10-temporary beam storage pedestal at dock; 11-beam transport dock; 12-sea surface line; 13-crawler crane; 14-transport and erection integrated vessel. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0022] Example: Figure 1-5 A method for extending and transporting a bridge beam to the sea is shown, comprising the following steps: Step 1: After the bridge beam 1 is prefabricated, it is stored on a temporary beam storage pedestal 5 in the prefabrication yard, and a crane is used to install the beam extension equipment, including installing the cantilever beam 2 on the upper ends of both sides of the bridge beam 1 through the cable 3, installing the bottom support beam 4 on the lower ends of both sides of the bridge beam 1, using a temporary pad 6 to compact the bridge beam 1 and the inner side of the cantilever beam 2 and the bottom support beam 4, and providing a cantilever beam at the outer end of the cantilever beam 2 to tension and pre-tighten the cable 3; The cantilever beam 2 is set as a large steel structure, the cantilever beam body is used as a temporary support end, the temporary pad 6 is used as a pressure end, the middle part of the cantilever beam 2 and the bottom support beam 4 are anchored on the bridge beam body 1 through the cable 3, and the cable 3 passes through the bridge beam body 1 by opening a temporary hole. The middle part of the cantilever beam 2 is subjected to a large bending stress, and a heightened section method is adopted. The anchoring part of the cable 3 is strengthened by a stiffening plate and a partition. The bridge beam 1 is stored on a temporary beam storage pedestal 5 in a prefabrication yard through a one-way sliding bearing. The one-way sliding bearing is used to meet the expansion and contraction displacement of the bridge beam 1 under the influence of temperature. The temporary beam storage pedestal 5 in the prefabrication yard includes a reinforced concrete column. A pedestal is provided at the lower end of the reinforced concrete column. A PHC pipe pile is provided at the lower end of the pedestal. The weight of the bridge beam 1 is transferred to the deep foundation of the PHC pipe pile through the reinforced concrete column and the pedestal. The temporary beam storage pedestal 5 in the prefabrication yard has the advantages of fast construction and low cost.

[0023] Step 2: Two module vehicles 8 carry the support brackets 9 and enter the bottom of the cantilever beams on both sides respectively. Through the height adjustment of the module vehicles themselves and the cooperation of the jacks, the force system conversion is completed, and the support brackets 9 are temporarily connected to the cantilever beam. The module vehicles 8 transport the bridge beam 1 to the direction of the seagoing pier through the beam extension equipment; Among them, the supporting bracket 9 adopts a steel column structure, which is fixed to the upper end of the module car 8 through a base. The top supports the cantilever beam body through a rubber pad and is temporarily connected with bolts; the module car 8 has multi-condition running, hydraulic lifting, multi-directional steering, and lifting and adjusting functions. The beam moving of two module cars 8 can be suitable for sea-going docks with different spans and spacings to realize the transportation of the bridge beam body 1.

[0024] Step 3: The module vehicle 8 transports the bridge beam 1 to the temporary beam storage pedestal 10 at the wharf via the seagoing pier. After the beam is dropped to the beam storage point, the connection between the support bracket 9 and the cantilever beam is released, and the module vehicle 8 returns to the beam yard with the support bracket 9.

[0025] Step 4: lower the bottom support beam 4 to the temporary beam storage pedestal 10 at the dock, and remove the cable 3, the cantilever beam 2, and the temporary pad 6; Among them, the crawler crane 13 is used to cooperate in dismantling the cantilever beam 2 and release the cable anchoring system. The bottom supporting beam 4 is lowered to the upper end of the temporary beam storage pedestal 10 at the dock through a wire rope. The crawler crane 13 lifts the bottom supporting beam 4, the cantilever beam 2, and the cable 3 to the module vehicle 8, and brings them back to the prefabricated beam yard for reuse.

[0026] Step 5: The transport-and-erecting integrated vessel 14 is anchored at a suitable tide level to the bottom of the beam to take out the beam, and the bottom support beam 4 for the extension is lifted off after the bridge beam body 1 is taken away; The transport-erection vessel 14 is anchored to the bottom of the bridge beam at a suitable tide level, and the transport-erection vessel 14 can carry out the functions of taking beams from the dock, carrying beams, and erecting beams at high altitude offshore.

[0027] In this embodiment, the module vehicle 8 adopts the existing structure and related technologies, has the advantages of combination and expansibility, and can adjust the number of modules of the module vehicle according to the length and weight of the beam body, with high flexibility. At the same time, the module vehicle 8 has an advanced control system to achieve precise positioning, improve installation accuracy, and ensure the safety of the beam moving process.

[0028] Specifically, the module vehicle moves the beam through the digital twin system to simulate the transportation path, avoid obstacles and optimize the turning radius. Laser scans the terrain, identifies soft foundation / steep slope areas, and automatically generates reinforcement plans (laying steel plates, foundation reinforcement, etc.); according to the weight and size of the beam, the number of module vehicles and the arrangement method (vertical / horizontal splicing) are dynamically adjusted. The height of the hydraulic legs is synchronously calibrated through 5G interconnection to ensure that the platform horizontal error is ≤3mm.

[0029] In addition, the module vehicle drives under the cantilever beam 2 and aligns the support points through the AI ​​visual recognition system (error ±2mm). The intelligent hydraulic leveling system automatically adjusts the outrigger pressure to evenly distribute the load. High-strength clamps and flexible straps are used for double fixation to prevent the beam from slipping during transportation. Sensors monitor the tension of the straps in real time and trigger warnings when abnormalities occur (such as loosening caused by sudden changes in wind force).

[0030] In addition, multiple groups of modular vehicles work together through a central control system to synchronize speed (0.01km / h accuracy) and steering angle in real time. When encountering curves or slopes, it automatically switches to "creep mode" (speed drops to 0.5km / h) to avoid inertial offset. Beidou positioning + inertial navigation system tracks position, and automatically corrects deviations exceeding 5cm. Pressure sensors monitor beam stress changes and trigger emergency braking when the limit is exceeded (such as the risk of soft foundation collapse).

[0031] In addition, the height of the modular vehicle is fine-tuned through the hydraulic system when the beam is dropped, and the beam drop accuracy is ±1mm with the help of laser guidance. After the fixture is automatically unlocked, the modular vehicle group slowly withdraws (supporting the "crab walk" mode to avoid obstacles). The modular vehicle is quickly disassembled into a single unit and transported to the next construction site by self-driving or flatbed truck.

[0032] In this embodiment, the transport-erection ship 14 integrates beam transportation, lifting and erection, without the need for additional transfer equipment, shortening the construction period by 40%-60%. The intelligent control system completes positioning, leveling and beam drop with one click, reducing manual intervention (supporting 5G remote control). The wind and wave resistant design (can withstand 8-level wind and waves) and night operation capabilities break through traditional weather restrictions. Efficient construction of river crossing sections reduces channel blockade time, reduces multi-ship collaboration and dock construction costs, and solves the problem of beam erection in long-distance and deep-water areas.

[0033] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent schemes made using the contents of the present invention specification, directly or indirectly applied in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A method for extending and transporting a bridge beam to the sea, characterized in that: The steps include: Step 1: After the bridge beam is prefabricated, it is stored on a temporary beam storage pedestal in the prefabrication yard, and the beam extension equipment is installed, including installing cantilever beams at the upper ends of both sides of the bridge beam through cables, installing bottom support beams at the lower ends of both sides of the bridge beam, and using temporary pads to compact the bridge beam and the inner side of the cantilever beam and the bottom support beam, and a cantilever beam is arranged on the outer side of the cantilever beam; Step 2: Two modular vehicles carrying support brackets enter the bottom of the cantilever beams on both sides respectively, and complete the force system conversion through the height adjustment of the modular vehicle itself and the cooperation of the jack, and temporarily connect the support bracket with the cantilever beam. The modular vehicle transports the bridge beam through the beam extension equipment and drives towards the seaward trestle; Step 3: The module vehicle transports the bridge beam to the temporary beam storage pedestal at the wharf through the seagoing trestle. After the beam is dropped to the beam storage point, the connection between the support bracket and the cantilever beam is released, and the module vehicle returns to the beam yard with the support bracket; Step 4: lower the bottom support beam to the temporary beam storage pedestal at the wharf, and remove the cables, cantilever beams, and temporary pads; Step 5: The transport-erection integrated vessel is anchored to the bottom of the beam at a suitable tide level to take out the beam. The bottom supporting beam is lifted off only after the bridge beam body is taken away.

2. The method for extending and transporting a bridge beam to the sea as claimed in claim 1, characterized in that: In step 1, the cantilever beam is set as a large-scale steel structure, the cantilever beam body serves as a temporary supporting end, the temporary pad serves as a pressure end, the middle part of the cantilever beam and the bottom supporting beam are anchored on the bridge beam body by cables, the cables pass through the bridge beam body by opening temporary holes, the middle part of the cantilever beam adopts a heightened section method, and the anchoring part of the cables is strengthened by stiffening plates and partitions.

3. The method for extending and transporting a bridge beam to the sea as claimed in claim 1 or 2, characterized in that: In step 1, the bridge beam is stored on a temporary beam storage pedestal in the prefabrication yard through a one-way sliding bearing. The one-way sliding bearing is used to meet the expansion and contraction displacement of the bridge beam under the influence of temperature. The temporary beam storage pedestal in the prefabrication yard includes a reinforced concrete column. A pedestal is provided at the lower end of the reinforced concrete column, and a PHC pipe pile is provided at the lower end of the pedestal.

4. The method for extending and transporting a bridge beam to the sea as claimed in claim 1 or 2, characterized in that: In step 2, the support bracket adopts a steel column structure, which is fixed to the upper end of the module car through a base, and the cantilever beam body is supported by a rubber pad on the top, and is temporarily connected with bolts.

5. The method for extending and transporting a bridge beam to the sea as claimed in claim 1 or 2, characterized in that: In step 4, the cantilever beam is removed by using a crawler crane to release the cable anchoring system. The bottom supporting beam is lowered to the upper end of the temporary beam storage pedestal at the dock through a wire rope. The crawler crane lifts the bottom supporting beam, cantilever beam, and cable onto the module vehicle and brings them back to the prefabricated beam yard for reuse.

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