A method for repairing and replacing a prefabricated and assembled connecting structure of a bridge lower part

Abstract

The application discloses a kind of beam lower prefabricated assembly connecting structure's maintenance replacement method, comprising the following steps: S1: prefabricated assembly connecting structure is divided into three working conditions, state ① is operating load-normal use stage, state ② is often encountered impact, earthquake-maintainable stage, state ③ is rarely encountered impact, earthquake-replacement stage;S2: if in state ①, no maintenance replacement is needed;If state ② or ③ is suffered, prefabricated assembly connecting structure is inclined, a circle of jack is arranged between pier upper segment and the pier lower segment, and the pier upper segment is adjusted to horizontal state by adjusting the lifting of each jack respectively, and then the maintenance or replacement work of the above-mentioned folded plate type force link and replaceable energy-dissipating element is carried out.The application has the advantages that: facing different functional requirements and load modes, three stress states are divided, and the technical target system of component failure mode, damage degree, maintenance and replacement method is clear.

Description

Technical Field

[0001] This invention belongs to the field of bridge substructure technology, specifically relating to a method for repairing and replacing prefabricated and assembled connection structures of bridge substructures. Background Technology

[0002] With the promotion and popularization of green construction concepts, prefabricated substructures have been widely used in bridge engineering. Currently, research focuses primarily on the reliability of assembled connection structures. Under existing technologies, it is possible to achieve connection performance at the assembled joints of piers and abutments that is not significantly different from that of cast-in-place components under normal use. The key challenge for future solutions is the repair and replacement of load-bearing components after damage to the substructure. This invention patent provides technical solutions and implementation methods to address this unresolved issue, further improving the ease of maintenance and replacement of bridge substructures based on previous prefabrication, assembly, and connection techniques.

[0003] The core technical points involved under the above background are as follows:

[0004] (1) As the main load-bearing component, the connecting structure can transmit and bear all the vertical loads transmitted from the superstructure of the bridge in the operation state, and has a certain ability to resist horizontal loads.

[0005] (2) It has excellent ductility and deformation capacity and is required to resist loads other than those in normal use, such as frequent vehicle and ship collisions and frequent earthquake loads, so that the target component can produce controlled sacrificial damage in the designated area and protect other components in a targeted manner.

[0006] (3) It has a limit restraint mechanism. When subjected to rare extreme loads, such as rare vehicle and ship collisions or rare earthquake loads, the substructure has a limit displacement capacity restraint mechanism to ensure that the target component does not tilt within a specified tilt range.

[0007] (4) The damaged area after the disaster is easy to repair and can be replaced. The repair and replacement costs are low, the operation methods and processes are simple, the repair construction efficiency is high, the time is short, and it can quickly restore the original functional characteristics of the structure. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of the prior art by providing a method for repairing and replacing the prefabricated assembly connection structure of a bridge substructure. This method divides the prefabricated assembly connection structure into three working states and selects the appropriate repair and replacement method based on the different working states.

[0009] The objective of this invention is achieved through the following technical solutions:

[0010] A method for repairing and replacing a prefabricated assembly connection structure of a bridge substructure, characterized in that the method includes the following steps:

[0011] S1: The prefabricated assembly connection structure is divided into three working states, namely state ①, state ② and state ③. Among them, state ① is the operational load - normal use stage, state ② is the frequent impact and earthquake - repairable stage, and state ③ is the rare impact and earthquake - replacement required stage.

[0012] The prefabricated assembly connection structure includes an operation module and a disaster-bearing module;

[0013] The operation module includes an upper segment of the pier, a lower segment of the pier, a ball seat, and several supporting components. The ball seat includes a concave ball seat fixed in the center to the top surface of the lower segment of the pier and a convex ball crown fixed in the center to the bottom surface of the upper segment of the pier. The convex ball crown is matched and installed with the concave ball seat. The supporting components are spaced around the outer side of the ball seat. The supporting components include a folded force transmission key, a transmission groove seat, and an upper connecting plate arranged sequentially from bottom to top. The folded force transmission key is fixedly installed on the top surface of the lower segment of the pier, and the upper connecting plate is connected to the bottom surface of the upper segment of the pier.

[0014] The disaster-bearing module includes a replaceable energy-consuming element and a limiting slot. The limiting slot is located on both sides of the replaceable energy-consuming element. The replaceable energy-consuming element is horizontally installed in the circular through hole of the support member. The two hemispherical force transmission keys at both ends of the replaceable energy-consuming element extend into the slot of the limiting slot.

[0015] S2: Determine the working state of the prefabricated assembly connection structure:

[0016] If the prefabricated assembly connection structure is in state ①, and the replaceable energy-consuming element has not deformed or is in the elastic deformation stage, then no maintenance or replacement is required;

[0017] If the prefabricated assembly connection structure is subjected to state ② or state ③, and the prefabricated assembly connection structure tilts, then maintenance or replacement work is carried out. A ring of jacks is installed in the gap space between the upper segment and the lower segment of the pier. By adjusting the lifting or lowering of each jack, the upper segment of the pier is adjusted to a horizontal state. Then, the maintenance or replacement work of the above-mentioned folding force transmission key and the replaceable energy-consuming element is carried out.

[0018] The replaceable energy-consuming element is a variable cross-section steel column, and the middle part of the replaceable energy-consuming element is movably connected to the circular through hole of the transmission slot seat while maintaining a clearance fit.

[0019] The limiting slot seat is arranged between adjacent support members and fixed to the top surface of the lower segment of the pier via a lower connecting plate. The limiting slot seat has slots on both sides pointing to the support members. The limiting slot seat and the transmission slot seat are arranged in a circumferential direction. The limiting slot seat has a limiting cover plate encapsulated on the outside of the slot.

[0020] The transmission slot seat is provided with limiting slot seats on both radial sides. The limiting slot seats are fixed to the top surface of the lower segment of the pier via the lower connecting plate. The limiting slot seat has a slot hole on the side pointing towards the transmission slot seat. The replaceable energy-consuming element is arranged radially and the hemispherical force transmission keys at both ends are inserted into the slot hole of the limiting slot. The limiting slot seat is encapsulated with a limiting cover plate on the outside of the slot hole.

[0021] The limiting cover plate encapsulates the hemispherical force transmission key embedded in the slot of the limiting groove seat, so that the hemispherical force transmission key is hinged to the limiting groove seat.

[0022] When the prefabricated assembly connection structure is subjected to state ②, the replaceable energy-consuming element undergoes limited plastic deformation. At this time, the hemispherical force transmission key does not contact the limiting cover plate. In this state: the folded force transmission key works within the first plastic stiffness zone KPA of the plastic working area, and the replaceable energy-consuming element works within the elastic stiffness zone KEB or the first plastic working area KPB. The hemispherical force transmission key of the replaceable energy-consuming element and the limiting groove seat form a mechanical ball joint structure.

[0023] When the prefabricated assembly connection structure is subjected to state ③, the folded force transmission key works within the first plastic stiffness zone KPA of the plastic working area, the replaceable energy dissipation element works within the second plastic working area KLB, the hemispherical force transmission key contacts the limiting cover plate, and the hemispherical force transmission key of the replaceable energy dissipation element and the limiting groove seat form a limit rod structure.

[0024] The advantages of this invention are:

[0025] (1) In addition to the advantages of prefabricated assembly connection structure in saving construction time, it also has the technical advantages of easy maintenance and replacement after disaster, and can quickly restore the structural performance level to the original functional characteristic level.

[0026] (2) This connection system is designed for different functional requirements and load modes, and is divided into three stress states. The technical objectives of component failure mode, damage degree, maintenance and replacement methods are clear, and the relevant technical implementation methods are clear. It has the advantages of reliability, durability, easy replacement and repairability.

[0027] (3) The parts that are repaired and replaced are the folded force transmission key and the replaceable energy-consuming components. The repair and replacement are partial and the cost is low. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the prefabricated assembly connection structure between the upper and lower segments of the bridge pier in this invention;

[0029] Figure 2 This is a three-dimensional schematic diagram of the structural arrangement of the top surface of the lower segment of the bridge pier in this invention;

[0030] Figure 3 This is a three-dimensional schematic diagram of the convex spherical crown on the bottom surface of the bridge pier segment in this invention;

[0031] Figure 4 This is a side view of the structural arrangement of the top surface of the lower segment of the bridge pier in this invention;

[0032] Figure 5 This is a cross-sectional view of the replaceable energy-consuming element on the transmission slot seat and the limiting slot seat in this invention.

[0033] Figure 6 This is a perspective view of the replaceable energy-consuming components on the transmission slot seat in the present invention arranged in a circumferential manner.

[0034] Figure 7 This is a three-dimensional view of the circumferential arrangement of the transmission groove seat and the limiting groove on the top surface of the lower segment of the bridge pier in this invention.

[0035] Figure 8 This is a three-dimensional view of the radial arrangement of the transmission groove seat and the limiting groove on the top surface of the lower segment of the bridge pier in this invention;

[0036] Figure 9 This is a schematic diagram showing the prefabricated assembly structure of the present invention arranged in a circumferential manner between the upper section and the lower section of the foundation.

[0037] Figure 10 This is a schematic diagram showing the prefabricated assembly structure arranged radially between the upper section and the lower section of the foundation in this invention;

[0038] Figure 11 This is a schematic diagram illustrating the mechanical behavior of the folded-web type force transmission key in this invention;

[0039] Figure 12 This is a schematic diagram illustrating the mechanical behavior of the replaceable energy-consuming component in this invention.

[0040] Figure 13 This is a schematic diagram of the combined mechanical behavior of the folded force transmission key and the replaceable energy-consuming element in this invention. Implementation

[0041] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0042] like Figure 1-13 The markings in the figure are as follows: 1. Lower connecting plate, 2. Support, 3. Upper connecting plate, 4. Transmission slot seat, 5. Folded force transmission key, 6. Concave ball seat, 7. Convex ball crown, 8. Limiting slot seat, 9. Limiting cover plate, 10. Bolt, 11. Upper segment of pier, 12. Lower segment of pier, 13. Replaceable energy-consuming element, 14. Hemispherical force transmission key, 21. Upper segment of pier, 22. Lower segment of pier.

[0043] Example 1: As Figure 1-7 As shown, this embodiment specifically relates to a method for repairing and replacing a prefabricated assembly connection structure in the substructure of a bridge. This method includes the following steps:

[0044] S1: The prefabricated assembly connection structure is divided into three working states: state ①, state ②, and state ③. State ① is the operational load-normal use stage, state ② is the frequent impact and earthquake-maintainable stage, and state ③ is the rare impact and earthquake-required replacement stage.

[0045] The prefabricated assembly connection structure includes an operation module and a disaster-bearing module.

[0046] like Figure 1-4 As shown, the operation module includes the upper segment 11 of the pier, the lower segment 12 of the pier, the ball seat, and several support components 2. The ball seat is located between the upper segment 11 and the lower segment 12 of the pier. The ball seat includes a concave ball seat 6 fixed in the center on the top surface of the lower segment 12 and a convex ball crown 7 fixed in the center on the bottom surface of the upper segment 11. The convex ball crown 7 is fitted into the concave ball seat 6. Each support member 2 is arranged at intervals around the ball seat on the outside of the ball seat and distributed in a circumferential direction. The support member 2 includes a folded force transmission key 5, a transmission groove seat 4 and an upper connecting plate 3 arranged sequentially from bottom to top. The folded force transmission key 5 is fixed on the top surface of the lower segment 12 of the pier. The upper connecting plate 3 is connected to the bottom surface of the upper segment 11 of the pier. A circular through hole is opened in the middle of the transmission groove seat 4 to allow the replaceable energy-consuming element 13 in the disaster-bearing module to be installed laterally and extend to both sides. It is necessary to ensure that the inner diameter of the circular through hole is consistent with the outer diameter of the replaceable energy-consuming element 13.

[0047] In this embodiment, the operation module connects the upper segment 11 and the lower segment 12 of the pier and has a clear, continuous and reliable force transmission path system to resist the loads of vehicles, temperature and other operational phases of the bridge structure under normal use. This state is defined as state ① (operational load - normal use phase). The elastic working area of ​​the folded force transmission key 5 (ensuring that the load level of the folded force transmission key 5 is within its elastic stiffness KEA range) provides the stiffness and strength requirements of the structure under this stress state.

[0048] like Figure 1-7 As shown, the disaster-bearing module includes a replaceable energy-consuming element 13, a limiting slot seat 8, and a limiting cover plate 9. Each limiting slot seat 8 is arranged between adjacent transmission slot seats 4 in a circumferential pattern. The limiting slot seats 8 are fixed to the top surface of the lower segment 12 of the pier via a lower connecting plate 1. Each limiting slot seat 8 has slots on both sides. The replaceable energy-consuming element 13 is a symmetrical structure, designed as a variable cross-section steel column based on the principle of equal strain. The middle part of the replaceable energy-consuming element 13 is movably connected to the transmission slot seat 4 and maintains a clearance fit, facilitating on-site installation and disassembly. Hemispherical force transmission keys 14 are provided at both ends of the replaceable energy-consuming element 13, extending into the slots of the limiting slot seats 8. The limiting cover plate 9 is fixed to the outside of the slots of the limiting slot seats 8 by bolts 10, embedding and sealing the hemispherical force transmission keys 14 within the slots of the limiting slot seats 8. It should be noted that both the limiting slot seat 8 and the limiting cover plate 9 are detachable two-part structures symmetrically arranged along the hemispherical force transmission key 14. During on-site construction, the replaceable energy-consuming element 13 and its hemispherical force transmission key 14 can be installed first, and then the limiting slot seat 8 can be assembled at the designated position. Bolts 10 are used to connect it to the positioned limiting slot seat 8 and limiting cover plate 9. It is foreseeable that the above-described installation process also provides a good solution for disassembly: the first to be installed is disassembled later, and the last to be installed is disassembled first.

[0049] like Figure 11-13 As shown, for the mechanical behavior of the folded-web type force transmission key 5, please refer to [link to relevant documentation]. Figure 11 For the mechanical behavior of the replaceable energy-consuming component 13, please refer to [link / reference]. Figure 12 For the combined mechanical behavior (structural comprehensive mechanical behavior) of the folded force transmission key 5 and the replaceable energy dissipation element 13, please refer to [link to relevant documentation]. Figure 13 The multi-level operating states of the bridge substructure in this embodiment can be described as follows:

[0050] State ① (Operating Load - Normal Use Stage): The elastic working zone of the folded force transmission key 5 (ensuring the load level of the force transmission key is within its elastic stiffness KEA range) provides the stiffness and strength requirements of the structure under this stress state. The replaceable energy dissipation element 13 has not deformed or is in the elastic deformation stage (the overall structural working state is in...). Figure 13 Central region ①).

[0051] State ② (Common Impact / Earthquake - Repairable Stage): Replaceable energy-dissipating element 13 undergoes limited plastic deformation. At this time, the hemispherical force transmission key 14 does not contact the limiting cover plate 9. In this state: the folded force transmission key 5 operates within the first plastic stiffness zone KPA of the plastic working area, and the replaceable energy-dissipating element 13 operates within the elastic stiffness zone KEB or the first plastic working area KPB. In this state, the overall structure exhibits good plastic ductility and deformation capacity within acceptable limits. This assembled connection structure forms a structure similar to a "mechanical ball joint," dissipating the energy generated by external loads. (The overall structural working state is in the attached...) Figure 13 In the middle area (②), the replaceable energy-consuming component 13 suffers limited damage in this state and can be selectively repaired as needed.

[0052] State ③ (Rare Impact, Earthquake - Replacement Required Stage): Replaceable energy-dissipating element 13 undergoes ultimate plastic deformation. At this time, the hemispherical force transmission key 14 comes into contact with the limiting cover plate 9. In this state: the folded force transmission key 5 operates within the first plastic stiffness zone (KPA) of the plastic working area, and the replaceable energy-dissipating element 13 operates within the second plastic working area (KLB). In this state, the structure undergoes significant deformation, and this assembled connection structure forms a structure similar to a "limit tie rod," limiting further tilting of the pier 11. (The overall structural working state is in the attached...) Figure 13 In the middle area (③), the replaceable energy-consuming component 13 suffers relatively serious damage and generally needs to be replaced after a disaster.

[0053] (S2) Determine the working state of the prefabricated assembly connection structure:

[0054] If the prefabricated assembly connection structure is in state ①, and the replaceable energy-consuming component 13 has not deformed or is in the elastic deformation stage, then no repair or replacement is required.

[0055] If the prefabricated assembly connection structure is subjected to state ② or state ③, causing it to tilt, repair or replacement work is required. A ring of jacks should be installed in the gap between the upper segment 11 and the lower segment 12 of the pier. By adjusting the lifting or lowering of each jack, the upper segment 11 of the pier can be adjusted to a horizontal state. Then, repair or replacement work can be carried out on the folded-web force transmission key 5 and the replaceable energy-consuming element 13. Regarding the replacement of the folded-web force transmission key 5, after the structure is leveled, the damaged element can be removed and a new folded-web force transmission key 5 can be re-welded.

[0056] The beneficial effects of this embodiment are:

[0057] (1) In addition to the advantages of prefabricated assembly connection structure in saving construction time, it also has the technical advantages of easy maintenance and replacement after disaster, and can quickly restore the structural performance level to the original functional characteristic level.

[0058] (2) This connection system is designed for different functional requirements and load modes, and is divided into three stress states. The technical objectives of component failure mode, damage degree, maintenance and replacement methods are clear, and the relevant technical implementation methods are clear. It has the advantages of reliability, durability, easy replacement and repairability.

[0059] (3) The parts that are repaired and replaced are the folded force transmission key and the replaceable energy-consuming components. The repair and replacement are partial and the cost is low.

[0060] Example 2: Figure 8 As shown, this embodiment specifically relates to a maintenance and replacement method for a prefabricated substructure of a bridge. The main difference from Embodiment 1 is that the disaster-bearing module in this embodiment is arranged radially. Specifically, the replaceable energy-consuming element 13, mounted on the transmission slot 4, is arranged horizontally and radially. Therefore, the two hemispherical force transmission keys 14 at both ends of the replaceable energy-consuming element 13 are respectively provided with limiting slots 8. The limiting slot 8 has a slot on the side facing the hemispherical force transmission key 14, and the hemispherical force transmission key 14 extends into the slot of the limiting slot 8. The limiting cover plate 9 is fixed outside the slot of the limiting slot 8 by bolts 10, embedding and sealing the hemispherical force transmission key 14 in the slot of the limiting slot 8. In other words, the maintenance and replacement method in this embodiment can adapt to prefabricated assembly structures with different arrangements.

[0061] Example 3: As Figure 9 and 10 As shown, this embodiment specifically relates to a maintenance and replacement method for a prefabricated assembly connection structure of a bridge substructure. The main difference between this embodiment and Embodiment 1 is that the prefabricated assembly connection is set between the segment 21 on the abutment and the lower segment 22 of the abutment. In other words, the maintenance and replacement method in this embodiment can adapt to different bridge substructures.

Claims

1. A method for repairing and replacing a prefabricated assembly connection structure in the substructure of a bridge, characterized in that... The repair and replacement method includes the following steps: S1: The prefabricated assembly connection structure is divided into three working states, namely state ①, state ② and state ③. Among them, state ① is the operational load - normal use stage, state ② is the frequent impact and earthquake - repairable stage, and state ③ is the rare impact and earthquake - replacement required stage. The prefabricated assembly connection structure includes an operation module and a disaster-bearing module; The operation module includes an upper segment of the pier, a lower segment of the pier, a ball seat, and several supporting components. The ball seat includes a concave ball seat fixed in the center to the top surface of the lower segment of the pier and a convex ball crown fixed in the center to the bottom surface of the upper segment of the pier. The convex ball crown is matched and installed with the concave ball seat. The supporting components are spaced around the outer side of the ball seat. The supporting components include a folded force transmission key, a transmission groove seat, and an upper connecting plate arranged sequentially from bottom to top. The folded force transmission key is fixedly installed on the top surface of the lower segment of the pier, and the upper connecting plate is connected to the bottom surface of the upper segment of the pier. The disaster-bearing module includes a replaceable energy-consuming element and a limiting slot. The limiting slot is located on both sides of the replaceable energy-consuming element. The replaceable energy-consuming element is horizontally installed in the circular through hole of the support member. The hemispherical force transmission keys at both ends of the replaceable energy-consuming element extend into the slot of the limiting slot. The replaceable energy-consuming element is a variable cross-section steel column. The middle part of the replaceable energy-consuming element is movably connected to the circular through hole of the transmission slot and maintains a clearance fit. S2: Determine the working state of the prefabricated assembly connection structure: If the prefabricated assembly connection structure is in state ①, and the replaceable energy-consuming element has not deformed or is in the elastic deformation stage, then no maintenance or replacement is required; If the prefabricated assembly connection structure is subjected to state ② or state ③, and the prefabricated assembly connection structure tilts, then maintenance or replacement work is carried out. A ring of jacks is installed in the gap space between the upper segment and the lower segment of the pier. By adjusting the lifting or lowering of each jack, the upper segment of the pier is adjusted to a horizontal state. Then, maintenance or replacement work is carried out on the folding force transmission key and the replaceable energy-consuming element.

2. The method for repairing and replacing a prefabricated assembly connection structure of a bridge substructure according to claim 1, characterized in that... The limiting slot seat is arranged between adjacent support members and fixed to the top surface of the lower segment of the pier via a lower connecting plate. The limiting slot seat has slots on both sides pointing to the support members. The limiting slot seat and the transmission slot seat are arranged in a circumferential direction. The limiting slot seat has a limiting cover plate encapsulated on the outside of the slot.

3. The method for repairing and replacing a prefabricated assembly connection structure of a bridge substructure according to claim 1, characterized in that... The transmission slot seat is provided with limiting slot seats on both radial sides. The limiting slot seats are fixed to the top surface of the lower segment of the pier via the lower connecting plate. The limiting slot seat has a slot hole on the side pointing towards the transmission slot seat. The replaceable energy-consuming element is arranged radially and the hemispherical force transmission keys at both ends are inserted into the slot hole of the limiting slot seat. The outer side of the slot hole of the limiting slot seat is encapsulated with a limiting cover plate.

4. A method for repairing and replacing a prefabricated assembly connection structure of a bridge substructure according to claim 2 or 3, characterized in that... The limiting cover plate encapsulates the hemispherical force transmission key embedded in the slot of the limiting groove seat, so that the hemispherical force transmission key is hinged to the limiting groove seat. When the prefabricated assembly connection structure is subjected to state ②, the replaceable energy-consuming element undergoes limited plastic deformation. At this time, the hemispherical force transmission key does not contact the limiting cover plate. In this state: the folded force transmission key works within the first plastic stiffness zone of the plastic working area, and the replaceable energy-consuming element works within the elastic stiffness zone or the first plastic working area. The hemispherical force transmission key of the replaceable energy-consuming element and the limiting groove seat form a mechanical ball joint structure. When the prefabricated assembly connection structure is subjected to state ③, the folded force transmission key works within the first plastic stiffness zone of the plastic working area, the replaceable energy-consuming element works within the second plastic working area, the hemispherical force transmission key contacts the limiting cover plate, and the hemispherical force transmission key of the replaceable energy-consuming element and the limiting groove seat form a limit tension rod structure.

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