Prefabricated multi-cavity composite pier and construction method thereof

Abstract

The invention discloses a prefabricated multi-cavity composite pier and a construction method thereof. The prefabricated multi-cavity composite pier comprises a bearing platform, a cover beam and a multi-cavity pier body. The multi-cavity pier comprises a first steel pipe and a first sleeve arranged outside the first steel pipe in a sleeving mode, a plurality of corrugated steel plates connected with one another are arranged between the first steel pipe and the first sleeve, a plurality of cavities are formed among the corrugated steel plates, the first steel pipe and the first sleeve, and ECC concrete is poured into the cavities. A reinforcement cage is arranged in the first steel pipe and filled with concrete; ribbed steel bars are installed at the upper end and the lower end of the multi-cavity pier, the ribbed steel bars at the upper end of the multi-cavity pier are connected with the upper end of the multi-cavity pier and the bent cap respectively, and the ribbed steel bars at the lower end of the multi-cavity pier are connected with the lower end of the multi-cavity pier and the bearing platform respectively. According to the bridge pier, the stress performance of the bridge pier is enhanced, it is ensured that the structural integrity and functionality of the bridge can still be kept after the bridge is impacted, rapid assembly construction and rapid transformation and repair are achieved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to a prefabricated assembled multi-cavity composite bridge pier and a construction method thereof, belonging to the technical field of bridge engineering. Background Art

[0002] In the field of bridge engineering, piers are the key supporting parts of bridge structures, and their stability and durability are crucial to the safety of the entire bridge. With the growth of traffic volume, the impact risk faced by bridges is also increasing. At present, traditional pier designs are often easily damaged or even collapsed under impact due to their long free length, large aspect ratio, and insufficient impact resistance, which seriously threatens the stability and traffic safety of bridges. Once an accident occurs, the damage identification, repair and reinforcement of the bridge will not only cost a lot of time and money, but also affect the normal use of the bridge.

[0003] In order to enhance the safety and durability of bridges, tough anti-collision and multi-cavity multi-level energy dissipation design have become the core of the development of bridge anti-collision technology. Tough anti-collision design focuses on the rapid recovery of the structure after impact. Even if the structure is partially damaged, it can still maintain basic functions and quickly restore traffic flow. Multi-cavity multi-level energy dissipation design sets up multiple energy dissipation layers inside the structure, so that the impact energy can be absorbed and dissipated layer by layer, effectively protecting the main structure from damage. The restraining effect of the multi-cavity structure on the concrete inside the pier can enhance the stress-bearing performance of the pier and ensure that the bridge can still maintain the structural integrity and functionality after being hit.

[0004] Moreover, in the construction field, the traditional method of pouring reinforced concrete piers on site requires on-site tying of steel bars and building of formwork. If the construction site is located in the water, an additional cofferdam needs to be set up, which not only consumes a lot of manpower and material resources, but also has low construction efficiency, long construction period, poor construction environment, and generates a lot of dust pollution. At present, prefabricated segmental piers are insufficient in stiffness, energy consumption capacity and impact resistance. Therefore, there is an urgent need for a bridge pier and construction method that can improve efficiency, ensure quality and resist impact, in order to meet the challenges in existing technologies and improve the safety performance and durability of bridges. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a prefabricated assembled multi-cavity composite pier and a construction method thereof. The pier has a tough anti-collision function, and realizes multi-level energy dissipation through its unique multi-cavity structure, effectively absorbing and dispersing the impact force, thereby significantly improving the impact resistance of the pier. The design of the pier also includes the constraint of the internal concrete by the multi-cavity, which enhances the force-bearing performance of the pier and ensures the structural integrity and functionality of the structure after being impacted. In addition, the pier adopts an assembled and modular construction process, which realizes rapid assembly construction and rapid reconstruction and repair after damage, improves construction efficiency, reduces maintenance costs, and enhances the safety and reliability of the bridge.

[0006] In a first aspect, the present invention provides a prefabricated assembled multi-cavity composite bridge pier, comprising a cap, a cap beam, and a multi-cavity bridge pier connected between the cap and the cap beam; the multi-cavity bridge pier comprises a first steel pipe and a first sleeve sleeved outside the first steel pipe, a plurality of corrugated steel plates connected to each other are arranged between the first steel pipe and the first sleeve, a plurality of cavities are formed between the plurality of corrugated steel plates and the first steel pipe and the first sleeve, ECC concrete is poured in the cavities, a steel cage is arranged in the first steel pipe and filled with concrete; the multi-cavity bridge pier Ribbed steel bars are installed at both the upper and lower ends, the ribbed steel bars at the upper end of the multi-cavity pier are respectively connected to the upper end of the multi-cavity pier and the cap beam, and the ribbed steel bars at the lower end of the multi-cavity pier are respectively connected to the lower end of the multi-cavity pier and the pedestal; the ribbed steel bars include first steel bars, the top and bottom of the first steel bars are fixedly connected to a plurality of second steel bars, and each of the second steel bars is fixedly connected to an arched steel plate; the concave surface of the arched steel plate at the top of the first steel bar faces downward, and the concave surface of the arched steel plate at the bottom of the first steel bar faces upward, and corresponds to the concave surface of the arched steel plate at the top of the first steel bar.

[0007] In one embodiment of the present invention, the corrugated steel plate is V-shaped, a plurality of V-shaped corrugated steel plates are interconnected to form a ring structure, and the plurality of V-shaped corrugated steel plates are fixedly connected to the first steel pipe and the first sleeve.

[0008] In one embodiment of the present invention, a first steel plate is fixedly connected to one side of the corrugated steel plate, a second steel plate is fixedly connected to the top of the first steel plate, a third steel plate is fixedly connected to the second steel plate, and a first U-shaped groove protruding upward is formed between the first steel plate, the second steel plate, and the third steel plate on one side of the corrugated steel plate; a first steel plate is fixedly connected to the other side of the corrugated steel plate, a second steel plate is fixedly connected to the bottom of the first steel plate, and the third steel plate is fixedly connected to the second steel plate, and a second U-shaped groove protruding downward is formed between the first steel plate, the second steel plate, and the third steel plate on the other side of the corrugated steel plate; two adjacent corrugated steel plates are connected by butting the first U-shaped groove and the second U-shaped groove with each other, the third steel plate on one side of the corrugated steel plate is inserted into the second U-shaped groove of the corrugated steel plate adjacent to it, and the third steel plate on the other side of the corrugated steel plate is inserted into the first U-shaped groove of the corrugated steel plate adjacent to it.

[0009] In one embodiment of the present invention, the multi-cavity pier is connected to the abutment and the cap beam through an external fan-shaped connecting device, and the external fan-shaped connecting device includes an external fan-shaped pier fixing device and an external fixing device connected thereto; the external fan-shaped pier fixing device includes a second steel pipe, a plurality of fan-shaped steel plates are fixedly connected to the outer side of the second steel pipe, the second steel pipe is sleeved on the outer periphery of the first sleeve, the second steel pipe is provided with a plurality of first bolt holes, the first bolt holes are provided with first bolts and first bolt washers, and the second steel pipe is fixedly connected to the first sleeve through the first bolts and the first bolt washers; the fan-shaped steel plate is provided with a plurality of second bolt holes.

[0010] In one embodiment of the present invention, the external fixing device includes a circular steel plate, on which a plurality of groups of trapezoidal steel plates are fixedly connected, the number of each group of trapezoidal steel plates is two, and two of the trapezoidal steel plates in each group are arranged opposite to each other and are provided with a plurality of third bolt holes; the circular steel plate is sleeved on the outer circumference of the first sleeve, and the circular steel plate is connected to the cap beam and the abutment through a plurality of high-strength long bolts and high-strength long bolt gaskets; the fan-shaped steel plate of the external fan-shaped pier fixing device is inserted into two oppositely arranged trapezoidal steel plates of the external fixing device, the second bolt holes of the fan-shaped steel plate correspond to the third bolt holes of the trapezoidal steel plate one by one, and second bolts and second bolt gaskets are provided, and the fan-shaped steel plate and the trapezoidal steel plate are connected by the second bolts and the second bolt gasket, so that the external fan-shaped pier fixing device is connected to the external fixing device.

[0011] In one embodiment of the present invention, a third groove is provided on the top of the pedestal, the multi-cavity pier is provided on the third groove, a first groove is provided on the bottom of the pedestal, a plurality of reserved holes for pedestal ribbed steel bars are provided below the third groove, and a plurality of ribbed steel bars are respectively provided in a plurality of reserved holes for pedestal ribbed steel bars; pedestal grouting holes are provided inside the pedestal, and the pedestal grouting holes are connected with the reserved holes for pedestal ribbed steel bars.

[0012] In one embodiment of the present invention, a second groove is provided on the top of the cap beam, and a plurality of reserved holes for the cap beam ribbed steel bars are provided on the bottom of the cap beam, and a plurality of the ribbed steel bars are respectively arranged in the plurality of reserved holes for the cap beam ribbed steel bars; a first cap beam grouting hole and a second first cap beam grouting hole are provided inside the cap beam, and the first cap beam grouting hole and the second first cap beam grouting hole are connected with the reserved holes for the cap beam ribbed steel bars.

[0013] In one embodiment of the present invention, the cap beam is provided with reserved holes for prestressed tendons of the cap beam, the pedestal is provided with reserved holes for prestressed tendons of the pedestal, and the multi-cavity pier is provided with holes for prestressed tendons. The reserved holes for prestressed tendons of the cap beam, the holes for prestressed tendons, and the reserved holes for prestressed tendons of the pedestal are connected in sequence, and prestressed tendons are arranged inside; the top of the prestressed tendons passes through the second groove of the cap beam and is provided with an anchor, and the bottom of the prestressed tendons passes through the first groove of the pedestal and is provided with an anchor.

[0014] In one embodiment of the present invention, a pressure sensor is installed at the ribbed steel bar, and the pressure sensor is used to detect whether the concrete is filled during the pouring process; three layers of arched steel plates are arranged on the upper and lower parts of each of the first steel bars, and the number of the arched steel plates in each layer is four, and each layer of the arched steel plates is evenly and symmetrically arranged around the first steel bar; three bolt holes are reserved on the fan-shaped steel plate and the trapezoidal steel plate, and they are in a triangular shape; the V-shaped angle formed by the two corrugated steel plates is between 60 degrees and 90 degrees; the surface of the corrugated steel plate is treated with anti-corrosion.

[0015] In a second aspect, the present invention provides a construction method of a prefabricated and assembled multi-cavity composite bridge pier, using the prefabricated and assembled multi-cavity composite bridge pier, the construction method comprising:

[0016] Step 1: prefabricate the external fan-shaped connection device; design the size of the second steel pipe and the annular steel plate used for the external fan-shaped connection device according to the size of the multi-cavity bridge pier, and connect the fan-shaped steel plate and the second steel pipe, and connect the trapezoidal steel plate and the annular steel plate by welding;

[0017] Step 2: Construction of the cap; Install the template for forming the third groove and the first groove on the cap to ensure the accurate position and size of the groove; Reserve the cap grouting holes in the template for subsequent grouting operations; Reserve the reserved holes for the cap ribbed steel bars in the third groove to facilitate the subsequent connection with the upper multi-cavity pier; Pour concrete in the template and use a vibrator to ensure that the concrete is dense and free of bubbles; During the pouring process, pay attention to protecting the reserved holes for the cap ribbed steel bars and the cap grouting holes from being blocked;

[0018] Step 3: Prefabricate multi-cavity piers; prepare materials required for construction, including the first steel pipe, steel cage, corrugated steel plate, first casing, and ECC concrete; build the steel cage in the prefabrication plant to ensure that its size and shape are consistent with the design drawings; then, place the corrugated steel plate between the first steel pipe and the first casing to construct a multi-cavity structure, and pour ECC concrete in these cavities to enhance the seismic performance of the piers; then place the steel cage in the first steel pipe to lay the foundation for pouring concrete, and reserve prestressed tendon holes inside the pier for tensioning prestressed tendons to improve the integrity of the structure; install ribbed steel bars on the upper and lower parts of the multi-cavity piers, and embed pressure sensors on the lower surface of the multi-cavity piers;

[0019] Step 4: Install the external fan-shaped connecting device; after fixing the external fixing device on the cap by high-strength long bolts, place the external fan-shaped pier fixing device at the corresponding position of the external fixing device and fix it by the first bolt;

[0020] Step 5: hoist the multi-cavity bridge pier; make its ribbed steel bars just fit into the reserved holes of the ribbed steel bars of the cap in the third groove; make the holes of the prestressed steel bars of the multi-cavity bridge pier correspond to the reserved holes of the prestressed steel bars of the cap; connect and fix the external fan-shaped connection device to the multi-cavity bridge pier through the first bolt; after fixing, use pumping to pour high-fluidity concrete into the gap between the multi-cavity bridge pier and the cap;

[0021] Step 6: Install the cap beam; first install the external fan-shaped connection device in the middle of the cap beam by high-strength long bolts, and then use a crane to make the ribbed steel bars just fit into the reserved holes of the ribbed steel bars of the cap beam; make the holes of the prestressed tendons of the multi-cavity pier correspond to the reserved holes of the prestressed tendons of the cap beam; connect and fix the external fan-shaped connection device to the multi-cavity pier by the first bolt;

[0022] Step 7: tensioning the prestressed tendons; prepare tensioning equipment, including tensioning machines, anchors, and jacks, and pass the prestressed tendons through the reserved holes for the prestressed tendons of one cap beam and out of the reserved holes for the prestressed tendons of another cap pedestal; after adjustment, install a conical clamp at the reserved holes for the prestressed tendons of the cap pedestal, and use a through-type jack to tension the prestressed tendons so that the multi-cavity pier segments fit tightly; after the prestressed tendons reach the designed tensioning force, use anchors to anchor the prestressed tendons at the end of the cap beam. After the anchoring is completed, seal the anchor area to prevent the intrusion of moisture and corrosive substances and protect the prestressed tendons;

[0023] Step 8: Pour concrete; Use high-fluidity concrete and use concrete pump equipment to transport the concrete to the pouring site; Pour concrete into the grouting holes of the cap, control the pouring speed during the pouring process to avoid bubbles and ensure that the concrete is evenly filled; The pressure sensor detects whether the reserved holes of the ribbed steel bars of the cap are filled with concrete.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. Improved bearing capacity: Multi-cavity bridge piers significantly improve their bearing capacity by using corrugated plates and fan-shaped energy dissipation devices. This design enables the piers to more effectively disperse and resist external forces when bearing loads, thereby improving the overall stability of the bridge.

[0026] 2. Enhanced impact resistance: The use of multi-cavity structure combined with concrete and the first casing enables the bridge pier to have better energy dissipation and shock absorption capabilities when facing impact loads such as earthquakes and ship collisions, thereby significantly improving the impact resistance of the bridge pier. This enhanced impact resistance helps protect the bridge structure from damage and ensure traffic safety. The multi-cavity of the pier constrains the internal concrete, enhances the force-bearing performance of the pier, and ensures the structural integrity and functionality of the structure after being hit.

[0027] 3. Enhanced structural safety: The installation of ribbed steel bars and pressure sensors provides additional safety for the bridge piers. The ribbed steel bars increase the bond between the steel bars and the concrete, while the pressure sensors are used to monitor the concrete pouring during the construction process to ensure the construction quality.

[0028] 4. Environmental adaptability: The design of the prefabricated multi-cavity composite pier with toughness and anti-collision function takes into account different environmental conditions, such as corrosive environment. By using anti-corrosion treated corrugated steel plates and the first casing, the durability and corrosion resistance of the pier are improved, making it adaptable to various environmental challenges.

[0029] 5. Economic benefits: The modularized construction process enables rapid assembly and construction, rapid transformation and repair, which will bring economic benefits and reduce maintenance and repair costs.

[0030] In summary, the present invention provides a prefabricated assembled multi-cavity composite pier and a construction method thereof, which has a tough anti-collision function, realizes multi-level energy dissipation through a unique multi-cavity structure, effectively absorbs and disperses the impact force, and thus significantly improves the impact resistance of the pier. The design of the pier also includes the constraint of the internal concrete by the multi-cavity, which enhances the stress-bearing performance of the pier and ensures the structural integrity and functionality of the structure after being impacted. In addition, the pier adopts an assembled and modular construction process, which realizes rapid assembly construction and rapid renovation and repair after damage, improves construction efficiency, reduces maintenance costs, and enhances the safety and reliability of the bridge. As a result, the pier not only enhances the stress-bearing performance of the pier, ensuring that the bridge can maintain structural integrity and functionality after being impacted, but also realizes rapid assembly construction and rapid renovation and repair, improving construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An overall schematic diagram of a prefabricated and assembled multi-cavity composite bridge pier provided by the present invention;

[0032] Figure 2 A three-dimensional diagram of a partial structure of a prefabricated multi-cavity composite bridge pier provided by the present invention;

[0033] Figure 3 A top view of the internal structure of the multi-cavity bridge pier provided by the present invention;

[0034] Figure 4 A schematic diagram of the structure of the corrugated steel plate and its connection provided by the present invention;

[0035] Figure 5 A schematic diagram of the structure of the external fixing device provided by the present invention;

[0036] Figure 6 A schematic diagram of the structure of the external fan-shaped bridge pier fixing device provided by the present invention;

[0037] Figure 7 A schematic diagram of the structure of the ribbed steel bar provided by the present invention;

[0038] Figure 8 A top view of a partial structure of a prefabricated and assembled multi-cavity composite bridge pier provided by the present invention.

[0039] In the figure: 1. multi-cavity bridge pier; 2. external fan-shaped connection device; 3. cap; 4. steel cage; 5. ribbed steel bar; 6. concrete; 7. first steel pipe; 10. ECC concrete; 11. fan-shaped steel plate; 12. second steel pipe; 13. first bolt; 14. first bolt gasket; 15. trapezoidal steel plate; 16. second bolt; 17. second bolt gasket; 19. high-strength long bolt; 20. high-strength long bolt gasket; 21. circular steel plate; 23. first bolt hole; 24. second bolt hole; 25. third bolt hole; 26. corrugated steel plate; 27. first casing; 28. first steel plate; 29. ​​second steel plate; 30. third steel plate; 31. arched steel Plate; 32. First steel bar; 33. Second steel bar; 36. Reserved holes for ribbed steel bars of cap beam; 37. Prestressed tendons; 38. Grouting holes of first cap beam; 39. Anchor; 40. Grouting holes of pedestal; 41. Pressure sensor; 43. Reserved holes for ribbed steel bars of pedestal; 44. Cap beam; 45. First groove; 46. Second groove; 47. Grouting holes of second first cap beam; 49. Cavity; 50. First U-shaped groove; 51. Second U-shaped groove; 52. External fan-shaped pier fixing device; 53. External fixing device; 54. Third groove; 55. Prestressed tendon holes; 56. Reserved holes for prestressed tendons of pedestal; 57. Reserved holes for prestressed tendons of cap beam. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] like Figure 1-Figure 8 As shown, the present invention provides a prefabricated assembled multi-cavity composite bridge pier, including a cap 3, a cap beam 44, and a multi-cavity bridge pier 1 connected between the cap 3 and the cap beam 44.

[0044] In some embodiments, the multi-cavity pier 1 includes a first steel pipe 7 and a first sleeve 27 sleeved outside the first steel pipe 7, a plurality of corrugated steel plates 26 connected to each other are arranged between the first steel pipe 7 and the first sleeve 27, a plurality of cavities 49 are formed between the corrugated steel plates 26 and the first steel pipe 7 and the first sleeve 27, ECC concrete 10 is poured in the cavity 49, a steel cage 4 is arranged in the first steel pipe 7 and filled with concrete 6; ribbed steel bars 5 are installed at the upper and lower ends of the multi-cavity pier 1, the ribbed steel bars 5 at the upper end of the multi-cavity pier 1 are respectively connected to the upper end of the multi-cavity pier 1 and the cap beam 44, the ribbed steel bars 5 at the lower end of the multi-cavity pier 1 are respectively connected to the lower end of the multi-cavity pier 1 and the pedestal 3, and a pressure sensor 41 is installed at the ribbed steel bars 5, and the pressure sensor 41 is used to detect whether the concrete is filled during the pouring process.

[0045] In this embodiment, a steel cage 4 is arranged in the first steel pipe 7 and filled with concrete 6, which can resist the expansion of cracks and structural damage when subjected to eccentric loads; the pressure sensor 41 arranged in the multi-cavity pier 1 is used to detect whether the concrete is filled during the pouring process, so as to monitor the pouring of concrete during the construction process and ensure the construction quality. Optionally, the material of the first sleeve 27 can be FRP (fiber reinforced plastic).

[0046] Furthermore, the corrugated steel plate 26 is V-shaped, and a plurality of V-shaped corrugated steel plates 26 are interconnected to form a ring structure, and the plurality of V-shaped corrugated steel plates 26 are fixedly connected to the first steel pipe 7 and the first sleeve 27 .

[0047] Furthermore, if Figure 4As shown, a first steel plate 28 is fixedly connected to one side of the corrugated steel plate 26, a second steel plate 29 is fixedly connected to the top of the first steel plate 28, a third steel plate 30 is fixedly connected to the second steel plate 29, and a first U-shaped groove 50 protruding upward is formed between the first steel plate 28, the second steel plate 29, and the third steel plate 30 on one side of the corrugated steel plate 26; a first steel plate 28 is fixedly connected to the other side of the corrugated steel plate 26, a second steel plate 29 is fixedly connected to the bottom of the first steel plate 28, and a third steel plate 30 is fixedly connected to the second steel plate 29. Three steel plates 30, a downwardly protruding second U-shaped groove 51 is formed between the first steel plate 28, the second steel plate 29 and the third steel plate 30 on the other side of the corrugated steel plate 26; the two adjacent corrugated steel plates 26 are connected to each other by the first U-shaped groove 50 and the second U-shaped groove 51, the third steel plate 30 on one side of the corrugated steel plate 26 is inserted into the second U-shaped groove 51 of the corrugated steel plate 26 adjacent to it, and the third steel plate 30 on the other side of the corrugated steel plate 26 is inserted into the first U-shaped groove 50 of the corrugated steel plate 26 adjacent to it.

[0048] In this embodiment, two adjacent corrugated steel plates 26 are connected by abutting the first U-shaped groove 50 and the second U-shaped groove 51 , thereby achieving a tight connection between the two adjacent corrugated steel plates.

[0049] In some embodiments, Figure 7 As shown, the ribbed steel bar 5 includes a first steel bar 32, and a plurality of second steel bars 33 are fixedly connected to the top and bottom of the first steel bar 32, and each of the second steel bars 33 is fixedly connected to an arched steel plate 31; the concave surface of the arched steel plate 31 at the top of the first steel bar 32 faces downward, and the concave surface of the arched steel plate 31 at the bottom of the first steel bar 32 faces upward and corresponds to the concave surface of the arched steel plate 31 at the top of the first steel bar 32.

[0050] Furthermore, three layers of arched steel plates 31 are provided on the upper and lower parts of each first steel bar 32, and each layer of the arched steel plates 31 has four, and each layer of the arched steel plates 31 is evenly and symmetrically arranged around the first steel bar 32. Through this design, a ribbed structure that enhances the contact area between the steel bar and the concrete is formed, that is, the ribbed steel bar 5, and the arched steel plates 31 increase the contact area between the steel bar and the concrete, evenly disperse the stress in the concrete, and prevent the steel bar from sliding out when subjected to stress.

[0051] In this embodiment, nine ribbed steel bars 5 are installed at both the upper and lower ends of the multi-cavity bridge pier 1 .

[0052] In some embodiments, the multi-cavity pier 1 is connected to the abutment 3 and the cap beam 44 via an external fan-shaped connecting device 2, and the external fan-shaped connecting device 2 includes an external fan-shaped pier fixing device 52 and an external fixing device 53 connected thereto.

[0053] Furthermore, the external fan-shaped pier fixing device 52 includes a second steel pipe 12, a plurality of fan-shaped steel plates 11 are fixedly connected to the outer side of the second steel pipe 12, the second steel pipe 12 is sleeved on the outer periphery of the first sleeve 27, the second steel pipe 12 is provided with a plurality of first bolt holes 23, the first bolt holes 23 are provided with first bolts 13 and first bolt washers 14, the second steel pipe 12 is fixedly connected to the first sleeve 27 by the first bolts 13 and the first bolt washers 14; the fan-shaped steel plate 11 is provided with a plurality of second bolt holes 24.

[0054] Furthermore, the external fixing device 53 includes a circular steel plate 21, on which a plurality of groups of trapezoidal steel plates 15 are fixedly connected, each group of trapezoidal steel plates 15 has two, and two of each group of trapezoidal steel plates 15 are arranged opposite to each other and provided with a plurality of third bolt holes 25; the circular steel plate 21 is sleeved on the outer periphery of the first sleeve 27, and the circular steel plate 21 is connected to the cap beam 44 and the pedestal 3 through a plurality of high-strength long bolts 19 and high-strength long bolt washers 20; the external fan The fan-shaped steel plate 11 of the fan-shaped pier fixing device 52 is inserted into two relatively arranged trapezoidal steel plates 15 of the external fixing device 53, the second bolt hole 24 of the fan-shaped steel plate 11 corresponds to the third bolt hole 25 of the trapezoidal steel plate 15 one by one, and a second bolt 16 and a second bolt gasket 17 are provided, the fan-shaped steel plate 11 and the trapezoidal steel plate 15 are connected by the second bolt 16 and the second bolt gasket 17, so that the external fan-shaped pier fixing device 52 is connected to the external fixing device 53.

[0055] In this embodiment, every two trapezoidal steel plates 15 form a stopper, and the distance between the two trapezoidal steel plates 15 is the same as the thickness of the fan-shaped steel plate 11. The fan-shaped steel plate 11 and the trapezoidal steel plate 15 fit tightly during installation. The trapezoidal steel plate 15 can be connected to the annular steel plate 21 by welding. The annular steel plate 21 is provided with high-strength long bolts 19, and high-strength long bolt gaskets 20 are installed under the high-strength long bolts 19 to disperse the pressure of the high-strength long bolts 19 on the annular steel plate 21, increase the friction between the high-strength long bolts 19 and the annular steel plate 21, and help prevent the high-strength long bolts 19 from loosening. The annular steel plate 21 is connected to the cap beam 44 and the abutment 3 through a plurality of high-strength long bolts 19 and high-strength long bolt gaskets 20, which can ensure the stability and sealing of the connection.

[0056] In some embodiments, a third groove 54 is provided on the top of the cap 3, the multi-cavity pier 1 is provided on the third groove 54, a first groove 45 is provided on the bottom of the cap 3, a plurality of reserved holes 43 for cap ribbed steel bars are provided below the third groove 54, and a plurality of the ribbed steel bars 5 are respectively provided in the plurality of reserved holes 43 for cap ribbed steel bars; a cap grouting hole 40 is provided inside the cap 3, and the cap grouting hole 40 is connected with the reserved holes 43 for cap ribbed steel bars.

[0057] In this embodiment, the reserved holes 43 of the ribbed steel bars of the cap are used to place the ribbed steel bars 5, so as to achieve effective combination of the ribbed steel bars 5 and concrete.

[0058] In some embodiments, a second groove 46 is provided at the top of the cap beam 44, and a plurality of reserved holes 36 for cap beam ribbed steel bars are provided at the bottom of the cap beam 44, and a plurality of the ribbed steel bars 5 are respectively arranged in the plurality of reserved holes 36 for cap beam ribbed steel bars; a first cap beam grouting hole 38 and a second first cap beam grouting hole 47 are provided inside the cap beam 44, and the first cap beam grouting hole 38 and the second first cap beam grouting hole 47 are connected with the reserved holes 36 for the cap beam ribbed steel bars.

[0059] In this embodiment, the reserved holes 36 of the cap beam ribbed steel bars are used to place the ribbed steel bars 5, so as to achieve effective combination of the ribbed steel bars 5 and concrete.

[0060] Furthermore, the cap beam 44 is provided with reserved holes 57 for prestressed tendons of the cap beam, the abutment 3 is provided with reserved holes 56 for prestressed tendons of the abutment, and the multi-cavity pier 1 is provided with prestressed tendon holes 55. The reserved holes 57 for prestressed tendons of the cap beam, the prestressed tendon holes 55, and the reserved holes 56 for prestressed tendons of the abutment are connected in sequence, and prestressed tendons 37 are arranged inside; the top of the prestressed tendon 37 passes through the second groove 46 of the cap beam 44 and is provided with an anchor 39, and the bottom of the prestressed tendon 37 passes through the first groove 45 of the abutment 3 and is provided with an anchor 39.

[0061] Preferably, the material of the external fan-shaped connecting device 2 can be selected from steel with high strength and good ductility, such as Q345 steel or Q390 steel, to ensure that it can absorb and dissipate energy when impacted and protect the main structure of the pier from damage.

[0062] Preferably, four fan-shaped steel plates 11 are evenly distributed around the second steel pipe 12 and connected by welding. Three bolt holes are reserved on the fan-shaped steel plates 11 and the trapezoidal steel plates 15 and form a triangle. This layout has good mechanical stability and can more evenly disperse and resist external forces, thereby improving the stability of the entire structure.

[0063] Preferably, the waveform of the corrugated steel plate 26 can be designed as a sine waveform or a cosine waveform, which have good energy dissipation characteristics in terms of mechanical properties and can provide greater deformation capacity and energy absorption when impacted.

[0064] Preferably, the thickness of the corrugated steel plate 26 is between 2 mm and 5 mm to ensure that the corrugated steel plate 26 can absorb and dissipate energy while providing sufficient rigidity and strength.

[0065] Preferably, the V-shaped angle formed by the two corrugated steel plates 26 is between 60 and 90 degrees. This angle range helps to increase the energy dissipation effect by changing the geometric shape of the corrugations when subjected to eccentric loads, while maintaining the stability of the structure.

[0066] Preferably, the surface of the corrugated steel plate 26 is subjected to anti-corrosion treatment, such as galvanizing or coating with anti-corrosion paint, to improve its durability and corrosion resistance and extend the service life of the bridge pier.

[0067] In addition, the present invention also provides a construction method of a prefabricated and assembled multi-cavity composite bridge pier, using the prefabricated and assembled multi-cavity composite bridge pier, the construction method comprises:

[0068] Step 1: prefabricate the external fan-shaped connecting device 2; design the size of the second steel pipe 12 and the annular steel plate 21 used in the external fan-shaped connecting device 2 according to the size of the multi-cavity bridge pier 1, and connect the fan-shaped steel plate 11 and the second steel pipe 12, and connect the trapezoidal steel plate 15 and the annular steel plate 21 by welding;

[0069] Step 2: Construction of the cap 3; Installing a template for forming the third groove 54 and the first groove 45 on the cap 3 to ensure that the position and size of the grooves are accurate; Reserving the cap grouting holes 40 in the template for subsequent grouting operations; Reserving the cap ribbed steel bar reserved holes 43 in the third groove 54 to facilitate the subsequent connection with the upper multi-cavity pier 1; Pouring concrete in the template, using a vibrator to ensure that the concrete is dense and free of bubbles; During the pouring process, pay attention to protecting the reserved cap ribbed steel bar reserved holes 43 and the cap grouting holes 40 from being blocked;

[0070] Step 3: Prefabricate the multi-cavity pier 1; prepare the materials required for construction, including the first steel pipe 7, the steel cage 4, the corrugated steel plate 26, the first casing 27, and the ECC concrete 10; build the steel cage 4 in the prefabrication factory to ensure that its size and shape are consistent with the design drawings; then, place the corrugated steel plate 26 between the first steel pipe 7 and the first casing 27 to construct a multi-cavity structure, and pour the ECC concrete 10 in these cavities 49 to enhance the seismic performance of the pier; then place the steel cage 4 in the first steel pipe 7 to lay the foundation for pouring the concrete 6, and reserve the prestressed tendon holes 55 for tensioning the prestressed tendons 37 inside the pier to improve the integrity of the structure; install the ribbed steel bars 5 on the upper and lower parts of the multi-cavity pier 1, and embed the pressure sensor 41 on the lower surface of the multi-cavity pier 1;

[0071] Step 4: Install the external fan-shaped connecting device 2; after fixing the external fixing device 53 on the cap 3 by the high-strength long bolts 19, place the external fan-shaped pier fixing device 52 at the corresponding position of the external fixing device 53 and fix it by the first bolts 13;

[0072] Step 5: hoist the multi-cavity bridge pier 1; make its ribbed steel bars 5 just fit into the reserved holes 43 of the ribbed steel bars of the cap in the third groove 54; make the prestressed steel bar holes 55 of the multi-cavity bridge pier 1 correspond to the reserved holes 56 of the prestressed steel bars of the cap; connect and fix the external fan-shaped connection device 2 to the multi-cavity bridge pier 1 through the first bolt 13; after fixing, use pumping to pour high-fluidity concrete into the gap between the multi-cavity bridge pier 1 and the cap 3;

[0073] Step 6: Install the cap beam 44; first install the external fan-shaped connection device 2 in the middle of the cap beam 44 by high-strength long bolts 19, and then use a crane to make the ribbed steel bars 5 just fit into the reserved holes 36 of the ribbed steel bars of the cap beam; make the prestressed steel bar holes 55 of the multi-cavity pier 1 correspond to the reserved holes 57 of the prestressed steel bars of the cap beam; connect and fix the external fan-shaped connection device 2 to the multi-cavity pier 1 by the first bolts 13;

[0074] Step 7: tensioning the prestressed tendons 37; prepare tensioning equipment, including tensioning machines, anchors 39, and jacks, pass the prestressed tendons 37 through a reserved hole 57 for prestressed tendons in one cap beam 44, and pass through another reserved hole 56 for prestressed tendons in another cap 3; after adjustment, install a conical clamp at the reserved hole 56 for prestressed tendons in the cap 3, and use a through-type jack to tension the prestressed tendons 37, so that the multi-cavity pier 1 segment fits tightly; after the prestressed tendons 37 reach the designed tensioning force, use the anchor 39 to anchor the prestressed tendons 37 at the end of the cap beam 44, and after the anchoring is completed, seal the anchor area to prevent the intrusion of moisture and corrosive substances, and protect the prestressed tendons 37;

[0075] Step 8: pouring concrete; using high-fluidity concrete, convey the concrete to the pouring site through concrete pump equipment; pouring concrete into the grouting holes 40 of the cap, controlling the pouring speed during the pouring process to avoid bubbles and ensure that the concrete is evenly filled; the pressure sensor 41 detects whether the reserved holes 43 of the ribbed steel bars of the cap are filled with concrete.

[0076] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A prefabricated multi-cavity composite bridge pier, characterized in that: The invention relates to a bridge pier (1) comprising a cap (3), a cap beam (44), and a multi-cavity bridge pier (1) connected between the cap (3) and the cap beam (44); the multi-cavity bridge pier (1) comprises a first steel pipe (7), and a first sleeve (27) sleeved outside the first steel pipe (7); a plurality of corrugated steel plates (26) connected to each other are arranged between the first steel pipe (7) and the first sleeve (27); a plurality of cavities (49) are formed between the plurality of corrugated steel plates (26) and the first steel pipe (7) and the first sleeve (27); ECC concrete (10) is poured in the cavity (49); a steel cage (4) is arranged in the first steel pipe (7) and filled with concrete (6); ribbed steel is installed at the upper and lower ends of the multi-cavity bridge pier (1). The ribbed steel bars (5) are connected to the upper end of the multi-cavity bridge pier (1) and the cap beam (44), and the ribbed steel bars (5) at the lower end of the multi-cavity bridge pier (1) are connected to the lower end of the multi-cavity bridge pier (1) and the pedestal (3); the ribbed steel bars (5) include first steel bars (32), the top and bottom of the first steel bars (32) are fixedly connected to a plurality of second steel bars (33), and each of the second steel bars (33) is fixedly connected to an arched steel plate (31); the concave surface of the arched steel plate (31) at the top of the first steel bars (32) faces downward, and the concave surface of the arched steel plate (31) at the bottom of the first steel bars (32) faces upward and corresponds to the concave surface of the arched steel plate (31) at the top of the first steel bars (32).

2. The prefabricated multi-cavity composite bridge pier according to claim 1, characterized in that: The corrugated steel plate (26) is V-shaped, and a plurality of V-shaped corrugated steel plates (26) are connected to each other to form a ring structure. The plurality of V-shaped corrugated steel plates (26) are fixedly connected to the first steel pipe (7) and the first sleeve (27).

3. The prefabricated multi-cavity composite bridge pier according to claim 2, characterized in that: A first steel plate (28) is fixedly connected to one side of the corrugated steel plate (26), a second steel plate (29) is fixedly connected above the first steel plate (28), and a third steel plate (30) is fixedly connected to the second steel plate (29); an upwardly protruding first U-shaped groove (50) is formed between the first steel plate (28), the second steel plate (29), and the third steel plate (30) on one side of the corrugated steel plate (26); a first steel plate (28) is fixedly connected to the other side of the corrugated steel plate (26), a second steel plate (29) is fixedly connected below the first steel plate (28), and the second steel plate (29) is fixedly connected to the third steel plate (30), a second U-shaped groove (51) protruding downward is formed between the first steel plate (28), the second steel plate (29) and the third steel plate (30) on the other side of the corrugated steel plate (26); two adjacent corrugated steel plates (26) are connected to each other by the first U-shaped groove (50) and the second U-shaped groove (51), the third steel plate (30) on one side of the corrugated steel plate (26) is inserted into the second U-shaped groove (51) of the adjacent corrugated steel plate (26), and the third steel plate (30) on the other side of the corrugated steel plate (26) is inserted into the first U-shaped groove (50) of the adjacent corrugated steel plate (26).

4. The prefabricated multi-cavity composite bridge pier according to claim 3, characterized in that: The multi-cavity bridge pier (1) is connected to the abutment (3) and the cap beam (44) through an external fan-shaped connecting device (2), the external fan-shaped connecting device (2) comprising an external fan-shaped bridge pier fixing device (52) and an external fixing device (53) connected thereto; the external fan-shaped bridge pier fixing device (52) comprises a second steel pipe (12), the outer side of the second steel pipe (12) is fixedly connected to a plurality of fan-shaped steel plates (11), the second steel pipe (12) is sleeved on the outer periphery of a first sleeve (27), the second steel pipe (12) is provided with a plurality of first bolt holes (23), the first bolt holes (23) are provided with first bolts (13) and first bolt washers (14), the second steel pipe (12) and the first sleeve (27) are fixedly connected through the first bolts (13) and the first bolt washers (14); the fan-shaped steel plates (11) are provided with a plurality of second bolt holes (24).

5. The prefabricated multi-cavity composite bridge pier according to claim 4, characterized in that: The external fixing device (53) comprises a circular steel plate (21), on which a plurality of groups of trapezoidal steel plates (15) are fixedly connected, each group of trapezoidal steel plates (15) has two members, two members of each group of trapezoidal steel plates (15) are arranged opposite to each other and are provided with a plurality of third bolt holes (25); the circular steel plate (21) is sleeved on the outer circumference of the first sleeve (27), and the circular steel plate (21) is connected to the cap beam (44) and the pedestal (3) through a plurality of high-strength long bolts (19) and high-strength long bolt washers (20); the external fan-shaped pier fixing The fan-shaped steel plate (11) of the device (52) is inserted into two oppositely arranged trapezoidal steel plates (15) of the external fixing device (53), the second bolt hole (24) of the fan-shaped steel plate (11) corresponds to the third bolt hole (25) of the trapezoidal steel plate (15) one by one, and a second bolt (16) and a second bolt gasket (17) are provided, and the fan-shaped steel plate (11) and the trapezoidal steel plate (15) are connected by the second bolt (16) and the second bolt gasket (17), so that the external fan-shaped pier fixing device (52) and the external fixing device (53) are connected.

6. The prefabricated multi-cavity composite bridge pier according to claim 5, characterized in that: The top of the cap (3) is provided with a third groove (54), the multi-cavity bridge pier (1) is arranged on the third groove (54), the bottom of the cap (3) is provided with a first groove (45), a plurality of cap ribbed steel bar reserved holes (43) are provided below the third groove (54), and a plurality of ribbed steel bars (5) are respectively arranged in the plurality of cap ribbed steel bar reserved holes (43); the interior of the cap (3) is provided with cap grouting holes (40), and the cap grouting holes (40) are connected with the cap ribbed steel bar reserved holes (43).

7. The prefabricated multi-cavity composite bridge pier according to claim 6, characterized in that: The top of the cap beam (44) is provided with a second groove (46), and the bottom of the cap beam (44) is provided with a plurality of reserved holes (36) for the cap beam ribbed steel bars, and a plurality of the ribbed steel bars (5) are respectively arranged in the plurality of reserved holes (36) for the cap beam ribbed steel bars; the interior of the cap beam (44) is provided with a first cap beam grouting hole (38) and a second first cap beam grouting hole (47), and the first cap beam grouting hole (38) and the second first cap beam grouting hole (47) are connected with the reserved holes (36) for the cap beam ribbed steel bars.

8. The prefabricated multi-cavity composite bridge pier according to claim 7, characterized in that: The cap beam (44) is provided with reserved holes (57) for cap beam prestressed tendons, the pedestal (3) is provided with reserved holes (56) for pedestal prestressed tendons, and the multi-cavity pier (1) is provided with prestressed tendon holes (55). The reserved holes (57) for prestressed tendons in the cap beam, the holes (55) for prestressed tendons, and the reserved holes (56) for prestressed tendons in the pedestal are connected in sequence, and prestressed tendons (37) are arranged inside; the top of the prestressed tendons (37) passes through the second groove (46) of the cap beam (44) and is provided with an anchor (39), and the bottom of the prestressed tendons (37) passes through the first groove (45) of the pedestal (3) and is provided with an anchor (39).

9. The prefabricated multi-cavity composite bridge pier according to claim 8, characterized in that: A pressure sensor (41) is installed at the ribbed steel bar (5), and the pressure sensor (41) is used to detect whether the concrete is filled during the pouring process; three layers of arched steel plates (31) are arranged on the upper and lower parts of each of the first steel bars (32), and the number of the arched steel plates (31) in each layer is four, and each layer of the arched steel plates (31) is evenly and symmetrically arranged around the first steel bar (32); three bolt holes are reserved on the fan-shaped steel plate (11) and the trapezoidal steel plate (15), and they are triangular; the V-shaped angle formed by the two corrugated steel plates (26) is between 60 degrees and 90 degrees; the surface of the corrugated steel plate (26) is treated with anti-corrosion.

10. A construction method for a prefabricated multi-cavity composite bridge pier, characterized in that: A prefabricated and assembled multi-cavity composite bridge pier according to any one of claims 1 to 9 is used, and the construction method comprises: Step 1: prefabricate the external fan-shaped connecting device (2); design the size of the second steel pipe (12) and the annular steel plate (21) used in the external fan-shaped connecting device (2) according to the size of the multi-cavity bridge pier (1), and connect the fan-shaped steel plate (11) and the second steel pipe (12) by welding, and connect the trapezoidal steel plate (15) and the annular steel plate (21); Step 2: Construction of the cap (3); installing a template for forming the third groove (54) and the first groove (45) on the cap (3) to ensure that the positions and sizes of the grooves are accurate; reserving cap grouting holes (40) in the template for subsequent grouting operations; reserving cap ribbed steel bar reserved holes (43) in the third groove (54) to facilitate subsequent connection with the upper multi-cavity bridge pier (1); pouring concrete in the template, using a vibrator to ensure that the concrete is dense and free of bubbles; during the pouring process, pay attention to protecting the reserved cap ribbed steel bar reserved holes (43) and the cap grouting holes (40) from being blocked; Step 3: Prefabricate a multi-cavity bridge pier (1); prepare materials required for construction, including a first steel pipe (7), a steel cage (4), a corrugated steel plate (26), a first casing (27), and ECC concrete (10); build a steel cage (4) in a prefabrication plant to ensure that its size and shape are consistent with the design drawings; then, place the corrugated steel plate (26) between the first steel pipe (7) and the first casing (27) to construct a multi-cavity structure, and pour ECC concrete (10) in these cavities (49) to enhance the seismic performance of the bridge pier; then place the steel cage (4) in the first steel pipe (7) to lay a foundation for pouring concrete (6), and reserve prestressed tendon holes (55) inside the bridge pier for tensioning prestressed tendons (37) to enhance the integrity of the structure; install ribbed steel bars (5) on the upper and lower parts of the multi-cavity bridge pier (1), and embed a pressure sensor (41) on the lower surface of the multi-cavity bridge pier (1); Step 4: Install the external fan-shaped connecting device (2); after fixing the external fixing device (53) on the pedestal (3) by means of high-strength long bolts (19), place the external fan-shaped pier fixing device (52) at the corresponding position of the external fixing device (53) and fix it by means of the first bolt (13); Step 5: hoist the multi-cavity bridge pier (1); make its ribbed steel bars (5) just fit into the reserved holes (43) of the ribbed steel bars of the cap in the third groove (54); make the prestressed steel bar holes (55) of the multi-cavity bridge pier (1) correspond to the reserved holes (56) of the prestressed steel bars of the cap; connect and fix the external fan-shaped connection device (2) to the multi-cavity bridge pier (1) by means of a first bolt (13); after fixation, use a pump to pour high-fluidity concrete into the gap between the multi-cavity bridge pier (1) and the cap (3); Step 6: Install the cap beam (44); first install the external fan-shaped connection device (2) in the middle of the cap beam (44) by means of high-strength long bolts (19), and then use a crane to make the ribbed steel bars (5) just fit into the reserved holes (36) of the ribbed steel bars of the cap beam; make the prestressed steel bar holes (55) of the multi-cavity bridge pier (1) correspond to the reserved holes (57) of the prestressed steel bars of the cap beam; connect and fix the external fan-shaped connection device (2) to the multi-cavity bridge pier (1) by means of the first bolts (13); Step 7: tensioning the prestressed tendons (37); prepare tensioning equipment, including a tensioning machine, an anchor (39), and a jack, and pass the prestressed tendons (37) through a reserved hole (57) for the prestressed tendons of a cap beam (44), and out of another reserved hole (56) for the prestressed tendons of a cap (3); after adjustment, install a conical clamp at the reserved hole (56) for the prestressed tendons of the cap (3), and use a through-type jack to prestress the prestressed tendons (37) so that the multi-cavity pier (1) segment fits tightly; after the prestressed tendons (37) reach the designed tensioning force, use the anchor (39) to anchor the prestressed tendons (37) at the end of the cap beam (44), and after the anchoring is completed, seal the anchoring area to prevent the intrusion of moisture and corrosive substances, so as to protect the prestressed tendons (37); Step 8: pouring concrete; using high-fluidity concrete, the concrete is transported to the pouring site through a concrete pump device; pouring concrete into the grouting holes (40) of the cap, controlling the pouring speed during the pouring process to avoid the generation of bubbles and ensure that the concrete is evenly filled; the pressure sensor (41) detects whether the reserved holes (43) of the ribbed steel bars of the cap are filled with concrete.

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