Construction method of self-resetting prefabricated concrete bridge system with easy replacement

Abstract

The application discloses a construction method of a self-resetting assembled concrete bridge system easy to replace, and comprises the following steps: adopting a steel reinforcement cage, a positioning support and concrete pouring to complete a pile cap base; installing a prestressed anchorage device on the pile cap base, connecting one end of a prestressed tendon with the prestressed anchorage device, and making the other end of the prestressed tendon project outside the pile cap base; sequentially passing the other end of the prestressed tendon through multiple prefabricated pier segments, connecting one end of the prefabricated pier segment with the pile cap base, and stacking the multiple prefabricated pier segments; hoisting a prefabricated bent cap above the multiple prefabricated pier segments, passing the other end of the prestressed tendon through the prefabricated bent cap and fixing the other end, connecting the prefabricated pier segment with the prefabricated bent cap; installing the prefabricated bent cap on the prefabricated bent cap through multiple elastic supports, and the elastic blocks are in the working space of the pile cap base. The application has high installation fault tolerance, high construction efficiency, and is convenient for replacing components after disasters, long-term loads and environmental effects in the subsequent service process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridges, and particularly relates to a construction method of a self-centering assembly type concrete bridge system easy to replace. BACKGROUND

[0002] At present, the assembly type bridge system is being vigorously promoted. According to the seismic performance, the prefabricated pier system is usually divided into two categories of 'equivalent cast-in-place' and 'non-equivalent cast-in-place', the former mainly relies on sleeve grouting connection, corrugated pipe grouting connection and socket connection and the like, and the latter mainly uses prestressed tendons to realize prestress application.

[0003] As for the self-centering assembly type concrete bridge using prestressed connection, the current technical standards and engineering applications are in the initial development stage, and the bridge is usually used in aseismic or moderate seismic areas, and the structure and performance of the bridge have the following disadvantages: ① the flexibility and convenience of full matching assembly of prefabricated components and replacement of components after earthquakes cannot be realized; and ② the bottom joint shear resistance and energy dissipation capacity at the pile cap are insufficient. SUMMARY

[0004] The present application aims to overcome the deficiencies of the prior art, and provides a construction method of a self-centering assembly type concrete bridge system easy to replace.

[0005] The purpose of the present application is achieved by the following technical scheme: a construction method of a self-centering assembly type concrete bridge system easy to replace, comprising the following steps:

[0006] S1, a pile cap base is completed by using a steel reinforcement cage, a positioning support and concrete pouring;

[0007] S2, a prestressed anchor is installed on the pile cap base, one end of a prestressed tendon is connected with the prestressed anchor, and the other end of the prestressed tendon is out of the pile cap base;

[0008] S3, the other end of the prestressed tendon sequentially passes through a plurality of prefabricated pier segments, one of the prefabricated pier segments is connected with the pile cap base, and the plurality of prefabricated pier segments are stacked;

[0009] S4, a prefabricated bent cap is hoisted to the top of the plurality of prefabricated pier segments, the other end of the prestressed tendon is connected with the prefabricated bent cap, and the prefabricated pier segments are connected with the prefabricated bent cap;

[0010] S5, a prefabricated box girder is installed on the prefabricated bent cap through a plurality of elastic supports, and an elastic block is in the working space of the pile cap base.

[0011] More preferably, step S1 comprises the following steps:

[0012] S101、Fixing the reinforcement cage, connecting the positioning support with the reinforcement cage;

[0013] S102, A bearing platform template is arranged outside the periphery of the reinforcement cage, the bearing platform template is provided with a first reserved hole, a first prestressed hole and a working space;

[0014] S103, Pouring concrete into the bearing platform template, and obtaining the bearing base after the concrete solidifies.

[0015] More preferably, step S3 comprises the following steps:

[0016] S301, Hoist a segment of the prefabricated pier segment above the bearing base, the prestressed tendon passes through a segment of the prefabricated pier segment, and the first shear key of the bearing base is installed in the first reserved slot of a segment of the prefabricated pier segment;

[0017] S302, Hoist another segment of the prefabricated pier segment above a segment of the prefabricated pier segment, the prestressed tendon passes through another segment of the prefabricated pier segment, and the second shear key of another segment of the prefabricated pier segment is installed in the first reserved slot of a segment of the prefabricated pier segment;

[0018] S303, Repeat step S302 to complete the stacking of all the prefabricated pier segments.

[0019] More preferably, the bearing base in step S1 comprises a positioning support and a bearing block, the positioning support is arranged on the bearing block and protrudes from the top of the bearing block, the prestressed anchor is installed on the bearing block, the prestressed tendon passes through the positioning support, and the positioning support is connected with the prefabricated pier segment.

[0020] More preferably, the bearing block is provided with a working space, a first reserved hole and a first prestressed hole, the working space is arranged on both sides of the positioning support, the working space is in communication with the first prestressed hole through the first reserved hole, and the positioning support is installed in the first prestressed hole.

[0021] More preferably, the positioning support comprises a prestressed pipe, a positioning plate, a first shear key and a dowel, the positioning plate is installed inside the bearing block, the positioning plate is connected with the first prestressed hole through the prestressed pipe, one end of the prestressed tendon passes through the prestressed pipe, the first shear key is arranged on one side of the positioning plate and protrudes from the top of the bearing block, and the dowel is arranged on the other side of the positioning plate and installed on the bearing block.

[0022] More preferably, the prefabricated pier segment in step S3 comprises a second shear key and a segment body, the segment body is provided with a hollow structure, a plurality of second prestressed ducts are arranged around the hollow structure, the prestressed connecting assembly passes through the second prestressed ducts, the second shear key is arranged at one end of the segment body, and the other end of the segment body is provided with a first reserved slot hole matched with the second shear key and the pile cap base.

[0023] More preferably, the prefabricated bent cap in step S4 comprises a box girder limiting part and a box girder supporting part, the box girder limiting part is connected with both ends of the box girder supporting part, the top of the box girder supporting part is provided with a plurality of second reserved holes, the plurality of second reserved holes are respectively communicated with the bottom of the box girder supporting part through third prestressed ducts, the prestressed anchorage device is arranged in the second reserved hole, the prestressed tendon passes through the third prestressed duct, and the bottom of the box girder supporting part is provided with a second reserved slot hole matched with the prefabricated pier segment.

[0024] More preferably, the elastic block in step S5 comprises a lifting ring and a block, the lifting ring is arranged at the top of the block, and the block is matched with the pile cap base.

[0025] More preferably, the concrete in step S1 is ultra-high performance concrete.

[0026] The present application has the following advantages and beneficial effects relative to the prior art:

[0027] 1. A construction method of an easily replaced self-centering assembly type concrete bridge system, which realizes high installation fault tolerance, high construction efficiency and facilitates component replacement after disaster conditions, long-term load and environmental effects in subsequent service.

[0028] 2. The present application solves the problem that the traditional pile cap is difficult to realize matching installation with the prefabricated pier segment by pouring on site at the bridge site, guarantees the positioning accuracy of on-site installation, and improves the shear resistance of the bottom area.

[0029] 3. The present application forms a concave-convex shear key to realize matching installation in factory production, guarantees the segment combination degree, and improves the shear resistance.

[0030] 4. The present application greatly improves the bearing capacity, energy dissipation capacity and ductility under disaster conditions (earthquake, high-speed vehicle collision, rockfall impact, etc.) by using ultra-high performance concrete, can be used in high seismic areas, and avoids material waste caused by using UHPC materials as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flowchart of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0032] Figure 2 is a bridge structure diagram of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0033] Figure 3 is a front view of a bridge structure of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0034] Figure 4 is a side view of a bridge structure of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0035] Figure 5 is a partial enlarged view of a bridge structure of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0036] Figure 6 is a bridge precast pier segment diagram of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0037] Figure 7 is a top view of a bridge precast pier segment of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0038] Figure 8 is a precast bent cap diagram of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0039] Figure 9 is a bearing platform front view of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0040] Figure 10 is a bearing platform sectional view of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0041] Figure 11 is a positioning support diagram of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0042] Figure 12 is an elastic block diagram of a construction method of an easily-replaced self-centering assembly type concrete bridge system of the present application;

[0043] The labels of the components in the drawings are as follows: 1 - bearing platform base; 11 - positioning support; 111 - peg; 112 - first shear key; 113 - prestressed pipe; 114 - positioning plate; 12 - first reserved hole; 13 - first prestressed hole; 14 - working space; 15 - bearing platform block; 2 - prefabricated pier segment; 21 - second prestressed hole; 22 - second shear key; 23 - first reserved slot; 24 - segment body; 3 - prefabricated cap beam; 31 - second reserved hole; 32 - third prestressed hole; 33 - second reserved slot; 34 - box girder limiting part; 35 - box girder supporting part; 4 - prefabricated box girder; 5 - prestressed connecting assembly; 51 - prestressed anchor; 52 - prestressed tendon; 6 - elastic support; 7 - elastic block; 71 - lifting ring; 72 - elastic block. DETAILED DESCRIPTION

[0044] The application purposes of the present application will be described in further detail below in combination with the drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation manners of the present application are not limited to the following embodiments.

[0045] As shown in the drawings, a construction method of a self-resetting prefabricated concrete bridge system easy to replace comprises the following steps: Figure 1

[0046] S1, a bearing platform base 1 is completed by using a steel reinforcement cage, a positioning support 11 and concrete pouring. The step S1 comprises the following steps:

[0047] S101, the steel reinforcement cage is fixed by binding, the positioning support 11 is placed (the positioning plate 114 of the positioning support 11 is about 2 cm lower than the concrete surface of the bearing platform base 1) and is welded with the steel reinforcement cage;

[0048] S102, a bearing platform formwork is supported at the periphery of the steel reinforcement cage, and the bearing platform formwork is provided with a first reserved hole 12, a first prestressed hole 13 and a working space 14;

[0049] S103, the bearing platform formwork is poured with concrete, the concrete is ultra-high performance concrete (UHPC, Ultra-High Performance Concrete), and the bearing platform base 1 is obtained after the ultra-high performance concrete is solidified.

[0050] S2, a prestressed anchor 51 is arranged in the first reserved hole 12, the prestressed anchor 51 is fixedly connected with a prestressed tendon 52, and the prestressed tendon 52 is projected out of the bearing platform base 1 through the prestressed pipe 113 of the positioning support 11;

[0051] ​S3, the prestressed tendon 52 passes through the second prestressed hole 21 of the three prefabricated pier segments 2 in turn, the pile cap base 1 is connected with the prefabricated pier segment 2, and the prefabricated pier segment 2 is connected through the first reserved slot hole 23 and the second shear key 22, the step S3 includes the following steps:

[0052] S301, hoist the first prefabricated pier segment 2, the prestressed tendon 52 passes through the corresponding four second prestressed holes 21 of the prefabricated pier segment 2 respectively to prestress tension and anchoring, and the first shear key 112 at the top of the pile cap base 1 is embedded into the first reserved slot hole 23 at the bottom of the first prefabricated pier segment 2;

[0053] S302, hoist the second prefabricated pier segment 2 to the upper side of the first prefabricated pier segment 2, the prestressed tendon 52 passes through the second prestressed hole 21 of the second prefabricated pier segment 2, and the second shear key 22 at the bottom of the second prefabricated pier segment 2 is embedded into the first reserved slot hole 23 of the first prefabricated pier segment 2;

[0054] S303, in turn, install the third prefabricated pier segment 2 on the second prefabricated pier segment 2.

[0055] S4, hoist the prefabricated cap beam 3 to the upper side of the third prefabricated pier segment 2, the prestressed tendon 52 passes through the third prestressed hole 32 and the second reserved hole 31 of the prefabricated cap beam 3 in turn, the prestressed anchor 51 is installed in the second reserved hole 31, the prestressed tendon 52 is connected with the prestressed anchor 51, and the second shear key 22 of the third prefabricated pier segment 2 is embedded into the second reserved slot hole 33 of the prefabricated cap beam 3;

[0056] S5, place four elastic supports 6 on the top of the prefabricated cap beam 3, hoist the prefabricated box girder 4 to the upper side of the prefabricated cap beam 3 and place it on the four elastic supports 6, and place two elastic blocks 7 in the working space 14 of the pile cap base 1.

[0057] When disaster accidents occur in the subsequent bridge service process, individual segment blocks are damaged seriously or prestressed long-term loss problems occur, the elastic block 7 can be extracted, the prestressed anchor 51 can be removed, the prestressed tendon 52 can be unloaded, the prefabricated component can be hoisted and removed, and the like, so that individual damaged components can be replaced, and the prestressed tendon 52 can be re-tensioned or replaced.

[0058] As Figures 2-4As shown, an easily replaced self-resetting assembled concrete bridge system includes a bearing platform base 1, three precast pier segments 2, a precast cap beam 3, four precast box girders 4, a prestressed connecting assembly 5, four elastic bearings 6, and elastic blocks 7. The prestressed connecting assembly 5 includes four prestressed tendons 52 and eight prestressed anchorage devices 51. The four prestressed tendons 52 are vertically installed on the bearing platform base 1 and pass through the prestressed ducts 113 of the positioning support 11. The four prestressed tendons 52 are arranged in a square shape. The three precast pier segments 2 are sequentially sleeved on the four prestressed tendons 52. The four precast pier segments 2 are sequentially stacked. The bottom of each of the four precast pier segments 2 is provided with a first reserved slot hole 23, and the top of each of the four precast pier segments 2 is provided with a second shear key 22. The bearing platform base 1 and the precast pier segments 2 are fixedly connected through the mutual cooperation of the second reserved slot hole 33 and the second shear key 22 or the mutual cooperation of the first reserved slot hole 23 and the first shear key 112. The precast pier segments 2 are fixedly connected through the mutual cooperation of the second reserved slot hole 33 and the second shear key 22 or the mutual cooperation of the first reserved slot hole 23 and the first shear key 112. The four prestressed tendons 52 pass through the precast cap beam 3. The precast cap beam 3 is fixedly connected with the precast pier segments 2 at the top through the reserved slot hole at the bottom. The four precast box girders 4 are installed on the top of the precast cap beam 3 through the rubber elastic bearings 6. The two elastic blocks 7 are filled in the working space 14 of the bearing platform base 1. The bearing platform base 1, the precast pier segments 2, the precast cap beam 3, and the precast box girders 4 are all made of ultra-high performance concrete.

[0059] The bearing platform base 1 is used for bearing and fixing. The precast pier segments 2 are reinforced concrete structures. The internal steel structure and the concrete strength are designed and determined according to the load conditions and the structure size. For the pier columns in earthquake-prone areas or adjacent to expressways, the precast pier segments 2 are preferably made of ultra-high performance concrete (UHPC, Ultra-High Performance Concrete) to increase the compression and tension resistance of the plastic hinge area, prevent the concrete at the toe part from crushing and peeling due to stress concentration under disaster load, and greatly reduce the energy dissipation capacity. The precast cap beam 3 is used for supporting, distributing, and transferring the load of the precast box girder 4. The precast box girder 4 is a hollow structure. The box girder precast in an independent site can be erected after the completion of the lower part of the project, which can accelerate the progress of the project and save the construction period. The prestressed tendons 52 are distributed at the four corner positions of the precast pier segments 2, so that the precast segments mainly rely on the prestressed tendons 52 to balance when swinging left and right under high-intensity seismic action, greatly reducing the tensile stress and cracking damage of the concrete, improving the bending resistance and self-resetting capacity of the pier, and being easy to manage, maintain, replace, and update, which can effectively solve the problems of prestress loss or failure during service. The elastic bearings 6 are made of rubber and play a buffering role between the precast pier segments 2 and the precast box girders 4. The elastic blocks 7 are made of rubber and play a lateral restraint role on the precast pier segments 2.

[0060] As shown in FIG. 1, Figure 5 and 10As shown, the bearing platform base 1 comprises a positioning support 11 and a bearing platform block 15. The positioning support 11 is arranged at the top center of the bearing platform block 15 and partially (first shear key 112) protrudes from the surface of the bearing platform block 15. The positioning plate 114 of the positioning support 11 is about 2 cm lower than the bearing platform block 15 and is welded and fixed with the surrounding steel bars. Two work spaces 14 are arranged at the two sides of the positioning support 11. The bottom inner side of the two work spaces 14 is provided with a first reserved hole 12 which is communicated with the top of the bearing platform block 15 through a first prestressed hole 13. The positioning support 11 is embedded in the interior of the bearing platform block 15 and communicated with the first reserved hole 12.

[0061] The positioning support 11 solves the problem that the traditional bearing platform is difficult to realize matching installation with the prefabricated pier segment 2 in the process of on-site pouring at the bridge site, ensures the positioning accuracy of on-site installation, and improves the shear capacity of the bottom area. The bearing platform block 15 plays a role of bearing and fixing. The work space 14 serves as an operation space for the technical personnel for maintenance and repair in the subsequent bridge service process and is used for pouring and curing of the bearing platform concrete. The first reserved hole 12 is used for fixedly installing the prestressed anchor device. The first prestressed hole 13 is used for placing the prestressed pipe 113.

[0062] As shown in Figure 11 , the positioning support 11 comprises a positioning plate 114, four first shear keys 112, eight studs 111 and four prestressed pipes 113. The four corners of the positioning plate 114 are respectively connected perpendicularly with the prestressed pipes 113. The first shear keys 112 are arranged between the two adjacent prestressed pipes 113. The first shear keys 112 at the opposite sides of the positioning plate are parallel to each other. The first shear keys 112 are matched with the first reserved slot hole 23 of the prefabricated pier segment 2. The studs 111 are installed on the side of the positioning plate 114 away from the first shear keys 112. Two studs 111 are respectively corresponding to one end of one first shear key 112.

[0063] The positioning plate 114 is made of steel plate and is used for positioning the prestressed tendon 52. The first shear key 112 is made of steel material and can realize matching installation with the prefabricated pier segment 2 and has a large tolerance to meet the accuracy requirement of on-site operation. The stud 111 is made of steel material and can strengthen the connection strength of the positioning plate 114 on the concrete. The prestressed pipe 113 is made of PVC and is used for penetrating through the prestressed tendon 52.

[0064] As shown in Figure 6 and 7As shown, the prefabricated pier segment 2 includes 4 second shear keys 22 and a segment body 24, which is a hollow cuboid structure, and the second prestressed ducts 21 passing through both ends of the prefabricated pier segment 2 are arranged at the four corners of the prefabricated pier segment 2, the four second prestressed ducts 21 are parallel to each other, the four second shear keys 22 are arranged at the top of the segment body 24, the two second shear keys 22 are arranged in parallel, and the second shear keys 22 are arranged between the two adjacent second prestressed ducts 21, and the first reserved slot holes 23 are arranged at the bottom of the segment body 24, the first reserved slot holes 23 are arranged between the two adjacent second prestressed ducts 21, and the opposite two first reserved slot holes 23 are parallel to each other.

[0065] The segment body 24 is made of concrete and plays a supporting role; the second shear keys 22 and the first reserved slot holes 23 form the concave-convex shear keys to be engaged, realize the matching installation in the factory, ensure the combination degree of the segment body 24, and improve the shear capacity; the second prestressed ducts 21 are used to place the prestressed tendons 52 to form the integral connection of the segment body 24; the first reserved slot holes 23 effectively change the traditional way of using a high-pressure water gun to chisel the joint of the self-resetting pier, realize the high-precision matching installation of the whole joint, and significantly improve the resistance performance under the horizontal load.

[0066] As shown in Figure 8 and 9 The prefabricated cap beam 3 includes a box beam limiting part 34 and a box beam supporting part 35, the box beam limiting part 34 is vertically connected with both ends of the box beam supporting part 35, the second reserved holes 31 are uniformly distributed at the top and middle positions of the box beam supporting part 35, the bottoms of the second reserved holes 31 are communicated with the bottom of the box beam supporting part 35 through the third prestressed ducts 32, and the second reserved slot holes 33 are arranged at the bottom of the box beam supporting part 35, the opposite two second reserved slot holes 33 are parallel to each other, and each second reserved slot hole 33 is located between the two adjacent third prestressed ducts 32.

[0067] The box beam limiting part 34 is used for limiting and fixing the prefabricated box beam 4; the box beam supporting part 35 is used for supporting the prefabricated box beam 4, the second reserved holes 31 are used for installing the prestressed anchorage device 51, the third prestressed ducts 32 are used for passing through the prestressed tendons 52, and the second reserved slot holes 33 effectively change the traditional way of using a high-pressure water gun to chisel the joint of the self-resetting pier, realize the high-precision matching installation of the whole joint, and significantly improve the resistance performance under the horizontal load.

[0068] As shown in Figure 12As shown, the elastic block 7 includes 2 lifting rings 71 and an elastic square block 72, the 2 lifting rings 71 are symmetrically installed on the top of the elastic square block 72, and the elastic square block 72 is matched with the working space 14 of the bearing platform base 1. The lifting ring 71 facilitates the maintenance personnel to take out the elastic square block 72 from the working space 14; the elastic square block 72 is used to fill the working space 14 and constrain the prefabricated pier segment 2 laterally.

[0069] The above specific embodiments are the preferred embodiments of the present application, and cannot limit the present application, and any changes or other equivalent replacement manners made without departing from the technical solutions of the present application are included in the protection scope of the present application.

Claims

1. A construction method for a self-resetting assembled concrete bridge system that is easy to replace, characterized in that: The following steps are involved: S1. Use steel cage, positioning brackets and concrete pouring to complete the cap base; S2. Install a prestressed anchor on the cap base, connect one end of a prestressed tendon to the prestressed anchor, and allow the other end of the prestressed tendon to protrude from the outside of the cap base; S3, the other end of the prestressed tendon passes through multiple prefabricated pier segments in sequence, one of the prefabricated pier segments is connected to the cap base, and the multiple prefabricated pier segments are stacked; S4. Hoisting the prefabricated cap beam to the top of the plurality of prefabricated pier segments, connecting the other ends of the prestressed tendons to the prefabricated cap beam, and connecting the prefabricated pier segments to the prefabricated cap beam; S5. The prefabricated box girder is mounted on the prefabricated cap beam via a plurality of elastic supports, with the elastic blocks filling the working space of the cap base; the elastic blocks act as lateral constraints on the prefabricated pier segments; Step S3 includes the following steps: S301, hoisting a section of the prefabricated pier segment above the cap base, passing the prestressed tendons through the section of the prefabricated pier segment, and installing a first shear key of the cap base in a first reserved slot of the section of the prefabricated pier segment; S302: hoisting the other prefabricated pier segment above the first prefabricated pier segment, passing the prestressed tendons through the other prefabricated pier segment, and installing the second shear key of the other prefabricated pier segment in the first reserved slot of the first prefabricated pier segment; S303, repeating step S302 to complete the stacking of all the prefabricated pier segments; The cap base in step S1 includes a positioning bracket and a cap block, the positioning bracket is arranged on the cap block and protrudes from the top of the cap block, the prestressed anchor is installed on the cap block, the prestressed tendons pass through the positioning bracket, and the positioning bracket is connected to the prefabricated pier segment; The base block is provided with an operating space, a first reserved hole and a first prestressed channel. The operating space is arranged on both sides of the positioning bracket. The operating space is connected to the first prestressed channel through the first reserved hole. The positioning bracket is installed in the first prestressed channel.

2. The construction method of a self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: Step S1 includes the following steps: S101, fixing the steel cage and connecting the positioning bracket to the steel cage; S102, supporting a cap template on the periphery of the reinforcement cage, wherein the cap template is provided with a first reserved hole, a first prestressed duct, and a working space; S103, pouring concrete into the foundation template, and obtaining the foundation base after the concrete is solidified.

3. The construction method of a self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: The positioning bracket includes a prestressed pipe, a positioning plate, a first shear key and a bolt. The positioning plate is installed inside the base block. The positioning plate is connected to the first prestressed channel through the prestressed pipe. One end of the prestressed tendon passes through the prestressed pipe. The first shear key is arranged on one side of the positioning plate and protrudes from the top of the base block. The bolt is arranged on the other side of the positioning plate and installed on the base block.

4. The construction method of the self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: The prefabricated pier segment in step S3 includes a second shear key and a segment body. The segment body is provided with a hollow structure. A plurality of second prestressed channels are provided around the hollow structure. The prestressed connection assembly passes through the second prestressed channels. The second shear key is installed at one end of the segment body. The other end of the segment body is provided with a first reserved slot, and the first reserved slot matches the second shear key and the pedestal base respectively.

5. The construction method of the self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: The prefabricated cap beam in step S4 includes a box beam limiting part and a box beam supporting part, the box beam limiting part is connected to both ends of the box beam supporting part, a plurality of second reserved holes are provided on the top of the box beam supporting part, and the plurality of second reserved holes are respectively connected to the bottom of the box beam supporting part through a third prestressed channel, the prestressed anchor is installed in the second reserved holes, the prestressed tendons pass through the third prestressed channel, and a second reserved slot is provided at the bottom of the box beam supporting part, and the second reserved slot matches the prefabricated pier segment.

6. The construction method of the self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: The elastic block in step S5 includes a hanging ring and a block, the hanging ring is installed on the top of the block, and the block matches the support base.

7. The construction method of the self-resetting assembled concrete bridge system that is easy to replace according to claim 1 is characterized in that: The concrete in step S1 is ultra-high performance concrete.

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