A double-width bearing platform flexible connection ship collision prevention reinforcing structure and construction method

Abstract

The application discloses a kind of existing double-width bearing platform flexible connection anti-ship collision reinforcing structure and construction method, including bearing platform heightening block, prefabricated connecting component and buffer block, bearing platform heightening block is located on the top surface of existing bearing platform, prefabricated connecting component is integrally prefabricated by the force transmission part of block body and the restraint part extending from its top to both sides, the restraint part is the plate body on the existing abutment and is opened with through slot, bearing platform heightening block is sleeved in through slot, annular gap is formed between bearing platform heightening block and the side wall of through slot, vertical gap is formed between the restraint part and the top surface of existing bearing platform, force transmission part is located between existing double-width bearing platform, and horizontal bridge direction gap is formed between existing double-width bearing platform, buffer block is respectively arranged in annular gap, vertical gap and horizontal bridge direction gap.The application makes double-width bearing platform flexible connection, so that double-width bridge jointly bears ship collision force, reduces single-width bridge ship collision effect, enhances the overall anti-ship performance of double-width bridge, while adverse effects on existing structure can be avoided.

Description

Technical Field

[0001] This invention pertains to bridge anti-ship collision reinforcement technology, and specifically relates to an existing double-span abutment flexible connection anti-ship collision reinforcement structure, as well as a construction method for the reinforcement structure. Background Technology

[0002] With the rapid development of my country's social economy, shipping traffic volume has increased year by year, the grade of planned waterways has been upgraded, and the size of representative vessels for protection has increased, leading to a corresponding increase in the collision resistance of protected bridges. As a result, the collision resistance of many bridges built in the early stages no longer meets the requirements of current standards. Under these conditions, it is necessary to modify existing bridge types according to current standards to meet collision resistance requirements and improve structural safety.

[0003] Based on project experience and data research, it is known that some long-span single-span bridges have insufficient protection against ship collisions, while the protection against ship collisions is greatly improved after the substructure of a double-span bridge is connected. For such bridges, the substructure connection method can be used for renovation. Currently, the most common connection method is rigid connection of the pier caps. This scheme makes the existing double-span bridge pier caps a whole, increasing the bridge's protection against ship collisions, but it will have adverse effects on the structure under normal bridge operation. Summary of the Invention

[0004] The first objective of this invention is to provide an existing double-span pier flexible connection anti-ship collision reinforcement structure that is safe and reliable under stress, easy to construct, material-saving and weight-reducing, low in cost, and has minimal impact on the main structure.

[0005] The first objective of this invention is achieved through the following technical solution: a flexible connection anti-ship collision reinforcement structure for existing double-span abutments, characterized in that it includes abutment heightening blocks, prefabricated connecting components, and buffer blocks. The abutment heightening blocks are fixed to the top surface of the existing abutment. The prefabricated connecting components are integrally prefabricated from a force-transmitting part of a block-shaped body and a constraint part extending from its top to both sides. The constraint part is a plate-shaped body erected on the existing bridge abutment with a through groove. The abutment heightening blocks are fitted into the through grooves, and an annular gap is formed between the abutment heightening blocks and the sidewalls of the through grooves. A vertical gap is formed between the constraint part and the top surface of the existing abutment. The force-transmitting part is located between the existing double-span abutments, and transverse bridge gaps are formed between the force-transmitting part and the existing double-span abutments respectively. The buffer blocks are respectively disposed in the annular gap, the vertical gap, and the transverse bridge gap.

[0006] This invention solves the problem of insufficient anti-ship collision performance of existing single-span bridges. By flexibly connecting the double-span piers, the two spans of the bridge can share the impact force of the ship collision, reducing the impact of the single-span bridge and enhancing the overall anti-ship collision performance of the double-span bridge. At the same time, it solves the problem of the adverse effects of conventional rigid connection reinforcement schemes on the existing structure. That is, when the structure is not subjected to ship collision force, the original structural force system is not changed. This invention is safe and reliable in terms of force, convenient to construct, saves materials and reduces weight, has low cost, and has little impact on the main structure. Moreover, this invention does not increase water obstruction, easily meets flood control requirements, and construction does not require a trestle bridge, making installation convenient.

[0007] The force transmission part of the present invention includes a top plate, a pair of longitudinal beams respectively disposed on both sides of the lower surface of the top plate, and a crossbeam located between the pair of longitudinal beams. The two ends of the crossbeam are connected to the pair of longitudinal beams, and the crossbeams are distributed in several along the longitudinal direction of the bridge.

[0008] The foundation heightening block of the present invention is connected to the existing foundation by post-installed steel bars.

[0009] The top surface of the raised platform block of the present invention is flush with the top surface of the prefabricated connecting component.

[0010] The constraint portion of the present invention is distributed in several parts along the longitudinal direction of the bridge, and correspondingly, the pier heightening block is distributed in several parts along the longitudinal direction of the bridge.

[0011] The buffer block described in this invention is made of rubber.

[0012] The second objective of this invention is to provide a construction method for the aforementioned existing double-span pier flexible connection anti-ship collision reinforcement structure.

[0013] The second objective of this invention is achieved through the following technical solution: a construction method for the aforementioned existing double-span pier flexible connection anti-ship collision reinforcement structure, characterized by comprising the following steps:

[0014] S1. Prefabricate connecting components in the factory;

[0015] S2. Fix the foundation raising block on the top surface of the existing foundation;

[0016] S3. Make buffer blocks and install them around the raised block of the pier, on the top surface of the pier, and on the inner side of the double-span pier.

[0017] S4. Hoist the prefabricated connecting components onto the construction platform, position them, and install them in the designated location, ensuring that the prefabricated connecting components fit tightly against the buffer block.

[0018] In step S2 of the present invention, reinforcing bars are installed on the top surface of the existing foundation and a foundation heightening block is poured.

[0019] In step S4 of the present invention, the top surface of the raised platform block and the top surface of the prefabricated connecting component are flush.

[0020] Compared with the prior art, the present invention has the following significant effects:

[0021] (1) This invention solves the problem of insufficient anti-ship collision performance of existing single-span bridges. By flexibly connecting the double-span piers, the two-span bridges can share the impact force of ship collisions, reducing the impact of ship collisions on single-span bridges, enhancing the overall anti-ship collision performance of double-span bridges, and improving structural safety.

[0022] (2) This invention solves the problem of the adverse effects of conventional rigid connection reinforcement technology on existing structures, that is, when the structure is not subjected to ship collision force, the original structural force system is not changed.

[0023] (3) The "mortise and tenon" structure of the present invention is a constraint structure formed by the through groove of the pier heightening block and the prefabricated connecting component. This structure is designed according to the existing planar relationship between the pier and the column. One or more "mortise and tenon" structures can be set. The "mortise and tenon" structure not only constrains the prefabricated connecting component, but also serves as a force transmission component. In the case of downstream bridge impact, it is the main force transmission component; in the case of impact along the bridge direction, it, together with the connecting component and the side connection surface of the pier, serves as the main force transmission component.

[0024] (4) When the structure of the present invention is subjected to the impact force of a ship, the rubber pad can play a role in dissipating energy and transmitting force multiple times.

[0025] (5) The prefabricated connecting components of the present invention are prefabricated structures. After being prefabricated in the factory, they are transported to the construction site and can be directly hoisted and installed. The construction process is simple, the cycle is short, and the construction cost is low. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a plan view of the present invention;

[0028] Figure 2 This is an elevation view of the present invention. Detailed Implementation

[0029] like Figure 1 , 2The diagram illustrates a flexible connection structure for preventing ship collisions on existing double-span foundations, based on the present invention. It includes a foundation raising block 1, prefabricated connecting components 2, and rubber buffer blocks 3. The foundation raising block 1 is fixed to the top surface of the existing foundation 4, specifically connected to it via post-installed reinforcing bars. The contact area between the foundation raising block 1 and the existing foundation 4 is smaller than the area of ​​the top surface of the existing foundation 4. The prefabricated connecting component 2 is integrally prefabricated from a block-shaped force-transmitting portion 6 and a constraint portion 5 extending from its top to both sides. The prefabricated connecting component is a prefabricated reinforced concrete structure, prefabricated in a factory and transported to the construction site for hoisting and installation. The construction process is simple, the cycle is short, and the construction cost is low. The constraint part 5 is a plate-like body erected on the existing pier 4 with a through groove 8. The pier heightening block 1 is fitted into the through groove 8. The top surface of the pier heightening block 1 is flush with the top surface of the constraint part 5. An annular gap is formed between the pier heightening block 1 and the side wall of the through groove 8. A vertical gap is formed between the constraint part 5 and the top surface of the existing pier 4. The force transmission part 6 is located between the existing double piers. A transverse bridge gap is formed between the force transmission part 6 and the existing double piers. Rubber buffer blocks are respectively set in the annular gap, vertical gap and transverse bridge gap to form annular rubber buffer blocks, vertical rubber buffer blocks and transverse bridge rubber buffer blocks. After the bridge structure is subjected to the impact force of the ship, the rubber buffer blocks can play a role in energy dissipation and force transmission multiple times. Its size is determined by calculation results and material properties.

[0030] The constraint part 5 can be one on each side of the force transmission part 6, or it can be distributed as several along the bridge direction, preferably 1-3.

[0031] The force transmission part 6 includes a top plate, a pair of longitudinal beams 10 respectively disposed on both sides of the lower surface of the top plate, and a crossbeam 11 located between the pair of longitudinal beams 10. The two ends of the crossbeam 11 are connected to the pair of longitudinal beams 10, and the crossbeam 11 is distributed in several parts along the longitudinal direction of the bridge.

[0032] The "mortise and tenon" structure refers to the constraint structure formed by the through groove between the raised block of the pier cap and the prefabricated connecting component. This structure is designed based on the planar relationship between the existing pier cap and the pier column. One or more "mortise and tenon" joints can be set. The "mortise and tenon" structure not only constrains the prefabricated connecting component, but also serves as a force transmission component. In the case of a ship impacting a bridge downstream in the direction of travel, it is the main force transmission component. In the case of impact along the bridge direction, it, together with the contact surface between the connecting component and the side of the pier cap, serves as the main force transmission component.

[0033] The working principle of this invention is as follows: The pier heightening block is fixed on the existing pier, providing transverse and longitudinal bridge-direction constraints for the prefabricated connecting components, while simultaneously transmitting transverse and longitudinal bridge-direction ship impact forces; the constraint part of the prefabricated connecting components forms a "mortise and tenon" structure with the pier heightening block through a through groove, used to constrain the prefabricated connecting components in the transverse and longitudinal bridge directions, while the panel is erected on the existing bridge abutment to provide vertical support; when the existing pier abutment is subjected to transverse and longitudinal bridge-direction ship impact forces, the force transmission part can transmit the force to the other bridge span, so that the two bridge spans share the ship impact force, reducing the ship impact effect of a single bridge span and enhancing the overall ship impact resistance performance of the two bridge spans; the buffer block is set in three gaps, namely, the transverse bridge-direction buffer block, the longitudinal bridge-direction buffer block, and the vertical pad block. The transverse and longitudinal bridge-direction buffer blocks play a role in buffering energy dissipation and force transmission when subjected to ship impact, and are not subjected to force in the non-ship impact state.

[0034] A construction method for the aforementioned existing double-span pier flexible connection anti-ship collision reinforcement structure includes the following steps:

[0035] S1. Prefabricated connecting components are manufactured in the factory, that is, the connecting components are prefabricated according to the design requirements.

[0036] S2. According to the design requirements, reinforce the top surface of the existing foundation and pour the foundation heightening block to complete the construction of the foundation heightening block.

[0037] S3. Make rubber buffer blocks and install them around the raised block of the pier, on the top surface of the pier, and on the inner side of the double-span pier, and reliably connect the rubber buffer blocks.

[0038] S4. Hoist the prefabricated connecting components onto the construction platform, position them, and install them in the designated location. The prefabricated connecting components should fit tightly with the buffer block, and the top surface of the pier heightening block should be flush with the top surface of the prefabricated connecting components.

[0039] The embodiments of the present invention are not limited thereto. Based on the above description of the present invention, and in accordance with common technical knowledge and conventional means in the field, the present invention can be modified, replaced or altered in various other forms without departing from the basic technical concept of the present invention, and all such modifications or alterations fall within the scope of protection of the present invention.

Claims

1. A flexible connection double-span pier structure for collision prevention and reinforcement, characterized in that: The system includes a raised platform block, prefabricated connecting components, and buffer blocks. The raised platform block is fixed to the top surface of the existing platform. The prefabricated connecting component is integrally prefabricated from a block-shaped force-transmitting part and a constraint part extending from its top to both sides. The constraint part is a plate-shaped body erected on the existing platform with a through groove. The raised platform block is fitted into the through groove, and an annular gap is formed between the raised platform block and the side wall of the through groove. A vertical gap is formed between the constraint part and the top surface of the existing platform. The force-transmitting part is located between the existing double-span platform, and transverse bridge gaps are formed between the force-transmitting part and the existing double-span platform. The buffer blocks are respectively set in the annular gap, the vertical gap, and the transverse bridge gap.

2. The existing double-span pier flexible connection anti-ship collision reinforcement structure according to claim 1, characterized in that: The force transmission part includes a top plate, a pair of longitudinal beams respectively arranged on both sides of the lower surface of the top plate, and a crossbeam located between the pair of longitudinal beams. The two ends of the crossbeam are connected to the pair of longitudinal beams, and the crossbeams are distributed in several along the longitudinal direction of the bridge.

3. The existing double-span pier flexible connection anti-ship collision reinforcement structure according to claim 2, characterized in that: The raised block of the foundation is connected to the existing foundation by post-installed steel bars.

4. The existing double-span pier flexible connection anti-ship collision reinforcement structure according to claim 3, characterized in that: The top surface of the raised platform block is flush with the top surface of the prefabricated connecting component.

5. The existing double-span pier flexible connection anti-ship collision reinforcement structure according to claim 4, characterized in that: The constraint portion is distributed in several parts along the bridge direction, and correspondingly, the pier heightening blocks are distributed in several parts along the bridge direction.

6. The existing double-span pier flexible connection anti-ship collision reinforcement structure according to claim 5, characterized in that: The buffer block is made of rubber.

7. A construction method for the existing double-span pier flexible connection anti-ship collision reinforcement structure as described in claim 1, characterized in that... Includes the following steps: S1. Prefabricate connecting components in the factory; S2. Fix the foundation raising block on the top surface of the existing foundation; S3. Make buffer blocks and install them around the raised block of the pier, on the top surface of the pier, and on the inner side of the double-span pier. S4. Hoist the prefabricated connecting components onto the construction platform, position them, and install them in the designated location, ensuring that the prefabricated connecting components fit tightly against the buffer block.

8. The construction method according to claim 7, characterized in that: In step S4, the top surface of the raised platform block is flush with the top surface of the prefabricated connecting component.

9. The construction method according to claim 8, characterized in that: In step S2, reinforcing bars are installed on the top surface of the existing foundation and the foundation heightening block is poured.

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