A new self-centering bridge pier with hollow hexagonal steel tube energy dissipation system and application thereof

Abstract

The application discloses a novel self-resetting pier with a hollow hexagonal steel pipe energy dissipation system and application thereof, and belongs to the technical field of bridge seismic resistance and shock absorption and isolation. The pier is composed of a pier body, an anchoring plate, prestressed steel tendons, an energy dissipation system, angle steels and a pile cap. The pier body is connected with the angle steels through cast-in-place method and shear keys on both sides of the pier bottom and is anchored with the pile cap through the anchoring plate and the prestressed steel tendons on the side of the pier body. The main components of the energy dissipation system are composed of hollow hexagonal steel pipes, bolts, built-in springs, gaskets and nuts and are fixed and installed on both sides of the bottom of the pier body and connected with the angle steels. The pier can bear potential inelastic deformation, avoids serious damage of the main components of the structure, shares the strength and rigidity of the system, provides sufficient energy dissipation capacity for the structural system, and makes the pier structure have the self-resetting function due to the prestressed steel tendons and the hollow hexagonal steel pipes. The energy dissipation system has the characteristics of easy installation, replacement, convenient maintenance and monitoring and diversification of energy dissipation components.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of bridge anti-seismic and seismic mitigation technology, and relates to a new self-centering bridge pier with a hollow hexagonal steel pipe energy dissipation system and application thereof. BACKGROUND

[0002] As important traffic infrastructure, the seismic performance of a bridge is a key indicator of the safety of the bridge structure. In recent years, major earthquakes have occurred frequently around the world, causing a large number of bridges to be damaged. Common bridge earthquake damage includes bridge span damage caused by fallen beams, mutual impact damage of bridge structures, bridge abutment subsidence and bending and shear damage of pier columns, which seriously threaten the safety of people's lives and property. Therefore, it is increasingly important to improve the seismic performance of bridges, meet the requirements of seismic codes, reduce the time and cost of restoring bridge structures to operation after an earthquake, and mitigate the damage of earthquakes to bridge structures.

[0003] Chinese patent 202021663916.2 discloses a shape memory alloy ring spring set and a fabricated self-centering bridge pier system, wherein the energy dissipation and self-centering components are a precision steel inner ring and a shape memory alloy outer ring on a steel rod. When the space between the precision steel inner rings is squeezed, the shape memory alloy outer ring will expand and deform, thereby dissipating energy. In addition, its special super-elasticity feature automatically restores the structure to its original position, thus also having the characteristic of self-centering. However, since the energy dissipation and self-centering components are installed inside the expanded foundation, they are difficult to monitor, not easy to maintain, and difficult to install. In addition, the energy dissipation and self-centering components are relatively simple and cannot respond to damage risks in a timely manner, which may pose a certain risk to the bridge structure. Patent 201910383625.3 discloses a new type of rocking self-centering bridge pier with energy dissipation device and application thereof, wherein the self-centering component is a prestressed steel bar inside the pier, and the energy dissipation component is a tension-compression combined energy dissipation device between the pier body and the pile cap, and the energy dissipation effect is provided by the shear deformation of high-damping rubber. Similarly, since the prestressed steel bar is inside the pier, it is difficult to monitor, not easy to maintain, and cannot be replaced. The invention uses a bridge seismic mitigation design, which has the problem of limiting the application conditions.

[0004] Therefore, the application provides a new self-resetting pier with a hollow hexagonal steel pipe energy dissipation system, which can dissipate seismic force through a pier bottom energy dissipation device, control the relative deformation of a bearing surface within a permissible range, and simultaneously provide energy dissipation by the hollow hexagonal steel pipe, spring and composite foam aluminum, and the hollow hexagonal steel pipe made of a memory alloy can restore after deformation, thereby giving the structure a self-resetting capability, and the vertical tension system also has good self-resetting capability, so that the upper structure of the bridge can be basically restored to the original position after an earthquake. The self-resetting component and the energy dissipation component are both installed outside the structure, so the new self-resetting pier with the hollow hexagonal steel pipe energy dissipation system has the characteristics of convenient health monitoring, convenient maintenance, replaceable components and convenient installation. SUMMARY

[0005] The application aims to provide a new self-resetting pier with a hollow hexagonal steel pipe energy dissipation system in a seismic activity area, which has good seismic energy dissipation performance, and is composed of a pier body, an anchoring plate, a prestressed steel tendon, an energy dissipation system, an angle steel and a pile cap.

[0006] The application provides a new self-resetting pier with a hollow hexagonal steel pipe energy dissipation system, which is composed of a pier body, an anchoring plate, a prestressed steel tendon, an energy dissipation system, an angle steel and a pile cap.

[0007] The pier can be a rectangular pier, a circular pier or a round-end pier, the pier body is connected with the angle steel through cast-in-place and shear keys on both sides of the pier bottom, and the pier body is anchored with the pile cap through the anchoring plate and the prestressed steel tendon on the side surface.

[0008] The energy dissipation system is composed of a hollow hexagonal steel pipe, a bolt, a nut, a gasket, an internal spring and composite foam aluminum, and is fixed and connected with the angle steel on both sides of the bottom of the pier body.

[0009] Further, two stiffening ribs are arranged at the lower part of the anchoring plate to resist the bending moment generated by the prestress on the anchoring plate, and the pile cap is provided with a hole for the prestressed steel tendon to pass through at the corresponding position, and is connected with the pier bottom plate through the prestressed steel tendon and is anchored through the nuts at both ends of the prestressed steel tendon.

[0010] Further, the hollow hexagonal steel pipe is made of a memory alloy material and filled with composite foam aluminum to increase the energy dissipation capacity, the hollow hexagonal steel pipe and the angle steel are provided with bolt holes penetrating through at the corresponding positions, and a reserved hole sleeve is arranged before the cast-in-place connection with the pier, the hollow hexagonal steel pipe is connected with the pile cap through the nut at the top of the hollow hexagonal steel pipe, the internal nut, the gasket, the internal spring and the bolt to bear force together, the internal spring is welded with the gasket at the top and welded with the hexagonal steel pipe at the bottom to form an integral whole, and after installation, the gasket is welded with the internal nut.

[0011] Further, the potential inelastic damage is imposed to the designated area responsible for absorbing the input energy, based on the lateral displacement of the seismic action, one end of the gap opening between the surface of the connecting element in the post-tensioning connection of the new self-centering bridge pier system and the other end of the surface extrusion deformation, the connecting bolt will generate a certain tension or pressure, which will be transmitted to the built-in spring inside to dissipate energy; according to its structure and installation method, the force will be transmitted to the hexagonal tube wall, forming a plastic hinge at the corner of the hexagonal tube, and causing the deformation of the composite foam aluminum, thereby absorbing the input energy.

[0012] Further, the cast-in-situ concrete inside the angle steel is connected with the pier body, and the cast-in-situ member is located between the angle steel and the hollow hexagonal steel pipe; shear anchor bolts are arranged on the bottom surface of the hollow hexagonal steel pipe and the angle steel as shear keys to increase the mechanical bite force, and the bottom surface of the hollow hexagonal steel pipe is integrally poured with the cast-in-situ member.

[0013] Further, the bolt is pre-buried in the bearing platform to reduce the construction and installation steps and cost; the pier body and the bearing platform connected with the angle steel are assembled into a whole by the prestressed system, and can be opened and closed at the interface; the pier column joint in the shape of a cylinder, cuboid or cone is arranged at the bottom of the pier body, and the corresponding position of the bearing platform is provided with a cavity embedded with a cylinder, cuboid or cone, to provide shear capacity and prevent sliding of the contact surface.

[0014] Further, the installation method of the new self-centering bridge pier system with a hollow hexagonal steel pipe energy dissipation system is as follows:

[0015] 1) According to the design requirements of the bridge, the size and material of the pier body, bearing platform, hollow hexagonal steel pipe and energy dissipation system are determined;

[0016] 2) The bolt is pre-buried in the bearing platform, the gasket, built-in spring and hollow hexagonal steel pipe are welded into a whole according to the corresponding position, and the hole is aligned; the pier body is placed in the corresponding position;

[0017] 3) The angle steel and the hollow hexagonal steel pipe are installed and positioned, the reserved hole sleeve is welded to the angle steel and the hollow hexagonal steel pipe, and the bolt can pass through the hole;

[0018] 4) The gasket is pressed to compress the built-in spring, the nut is placed on the gasket, the holes are aligned and the built-in spring is loosened, the built-in spring is used to extrude the nut, and the internal nut is positioned;

[0019] 5) The gasket is compressed to compress the built-in spring and leave a spare operation space, the upper and lower nuts are tightened and the built-in spring is loosened, the gasket and the internal nut are welded, the bolt can transmit the force and deformation to the hollow hexagonal steel pipe and the built-in spring; the composite foam aluminum is filled in the hollow hexagonal steel pipe to enhance the energy dissipation effect of the system;

[0020] 6), on both sides of the pier body, the angle steel is poured into the body with cast-in-place components, and the bottom surface of the hollow hexagonal steel pipe is poured into the body with cast-in-place components;

[0021] 7), tension and anchor the prestressed steel bundle, so that the pier body and the pile cap become a whole, and the installation is completed.

[0022] Advantages: compared with the prior art, the characteristics of the present application are: 1, the new self-resetting pier system can improve the seismic performance while maintaining good carrying capacity in the use stage. First, under the action of strong earthquake, the new self-resetting pier system has a certain flexibility, which can realize the extension of the self-vibration period of the bridge structure, avoid the resonance reaction with the seismic motion, reduce the acceleration response of the bridge structure, and further reduce the seismic response thereof. Second, with the extension of the self-vibration period of the bridge structure, the corresponding displacement will also increase, and with the increase of the structural deformation, the hollow hexagonal steel pipe energy dissipation system can transmit the seismic energy to the bolt through the deformation of the angle steel, and then deform the built-in spring, composite foam aluminum and hollow hexagonal steel pipe. The hexagonal steel pipe changes from the original elastic state to the plastic state, and the plastic deformation of the energy dissipation system is used to dissipate the seismic force. Therefore, the new self-resetting pier system can significantly improve the seismic performance of the bridge structure and reduce the damage of the bridge to the minimum. 2, the new self-resetting pier system has the advantages of eliminating permanent residual deformation and good self-resetting performance. Because the hollow hexagonal steel pipe energy dissipation system bears most of the seismic motion and dissipates energy through plastic deformation, the energy distributed in the pier and the superstructure will decrease, and no plastic deformation and damage will be caused. The post-tensioning system of the new self-resetting pier has good structural stiffness and strength, so the self-resetting capability of the bridge structure system can keep the bridge structure system at the initial vertical position, and has the self-resetting capability. 3, because the hollow hexagonal steel pipe energy dissipation system is installed on both sides of the bottom of the pier body, and the materials used are simple and easy to obtain, it has the advantages of being expandable (can be used for different sizes) to adapt to its operation function, easy to install and replace, thereby reducing the maintenance operation cost, and effectively sharing the strength and stiffness of the system, and the energy dissipation and vibration reduction capability of the pier is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 is a detail drawing of the energy dissipation system in the present application;

[0025] Figure 3 is a structure diagram of anchoring the prestressed steel bundle in the present application;

[0026] Figure 4 is a detail drawing of the angle steel and energy dissipation system before pouring in the present application;

[0027] Figure 5 is the configuration diagram of the bearing platform in the application;

[0028] Figure 6 is the installation step diagram of the energy dissipation system in the application;

[0029] Figure 7 is the hysteresis curve diagram of the novel self-resetting pier structure in the application;

[0030] In the figure, 1. pier body, 2. anchoring plate, 3. prestressed steel tendon, 4. energy dissipation system, 5. angle steel, 6. bearing platform, 7. hollow hexagonal steel pipe, 8. bolt, 9. nut, 10. backing plate, 11. built-in spring, 12. composite aluminum foam, 13. stiffener, 14. reserved hole sleeve, 15. cast-in-place member, 16. shear anchor, 17. pier column joint, 18. bearing platform cavity. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions of the application, the technical solutions of the application will be further described in detail below with reference to the accompanying drawings:

[0032] As described in the figure, the novel self-resetting pier with hollow hexagonal steel pipe energy dissipation system of the application is composed of a pier body 1, an anchoring plate 2, a prestressed steel tendon 3, an energy dissipation system 4, an angle steel 5 and a bearing platform 6, etc.

[0033] The applicable pier includes a rectangular pier, a circular pier, a round-end-shaped pier, etc.; the pier body 1 is connected with the angle steel 5 through cast-in-place method and shear key at both sides of the pier bottom, and is anchored with the bearing platform 6 through the anchoring plate 2 and the prestressed steel tendon 3 at the side of the pier body 1.

[0034] The prestressed steel tendon 3 is anchored on the anchoring plate 2 and the bearing platform 6.

[0035] The main components of the energy dissipation system 4 are composed of a hollow hexagonal steel pipe 7, a bolt 8, a built-in spring 11, a backing plate 10 and a nut 9, and are installed and fixed at both sides of the bottom of the pier body 1 and connected with the cast-in-place member 15 through the shear key at the bottom of the hollow hexagonal steel pipe 7.

[0036] Further, two stiffeners 13 are arranged at the lower part of the anchoring plate 2 to resist the bending moment effect of the prestress generated at the anchoring plate 2.

[0037] Further, the anchoring plate 2 and the bearing platform 6 are both provided with a hole for the prestressed steel tendon 3 to pass through at the corresponding positions; the anchoring plate 2 is connected with the pier bottom plate through the prestressed steel tendon 3, is anchored through the nuts 9 at both ends of the prestressed steel tendon 3, the pier and the bearing platform 6 are assembled into a whole through the prestressed steel tendon 3, and the self-resetting of the pier can be realized through the prestress provided by the prestressed steel tendon 3 when an earthquake occurs.

[0038] Furthermore, the hollow hexagonal steel tube 7 and the angle steel 5 are provided with bolt holes passing through at corresponding positions, and reserved hole sleeves 14 are provided before being connected to the bridge piers for cast-in-place.

[0039] Furthermore, the hollow hexagonal steel tube 7 is connected to the base 6 through the nut 9 on the top of the hollow hexagonal steel tube 7, the nut 9 inside, the pad 10, the built-in spring 11 and the bolt 8 to bear the force together.

[0040] Furthermore, the top of the built-in spring 11 is welded to the backing plate 10, and the bottom is welded to the hollow hexagonal steel tube 7 to form a whole. After being installed in place, the backing plate 10 is welded to the internal nut 9.

[0041] Furthermore, cast-in-place concrete in the angle steel 5 is connected to the pier body 1 , and the cast-in-place concrete is named as cast-in-place component 15 .

[0042] Furthermore, shear anchor bolts 16 are provided on the bottom surface of the hollow hexagonal steel tube 7 and in the angle steel 5 as shear keys to increase the mechanical bite force. The bottom surface of the hollow hexagonal steel tube 7 and the cast-in-place component 15 are cast as one body.

[0043] Furthermore, the hollow hexagonal steel tube 7 is made of memory alloy material, and composite foam aluminum 12 is filled in the hollow hexagonal steel tube 7 to enhance the energy dissipation and vibration reduction capabilities of the hollow hexagonal steel tube 7 and the self-resetting bridge pier. The hollow hexagonal steel tube 7 has a certain elasticity and can provide restoring force when compressed or stretched, thereby realizing the self-resetting function of the bridge pier.

[0044] Furthermore, the bolts 8 are pre-buried inside the base 6, which reduces the construction and installation steps and the cost.

[0045] Furthermore, the pier body 1 and the cap 6 connected to the angle steel 5 are assembled into a whole through a prestressed system, and can be opened and closed at the junction with each other.

[0046] Furthermore, a cylindrical, rectangular or conical joint is provided at the bottom of the pier body 1, and an embedded cylindrical, rectangular or conical cavity is provided at the corresponding position of the base 6 to provide shear resistance and prevent the contact surface from slipping.

[0047] Example:

[0048] like Figures 1-5 As shown in the figure, in the new self-centering bridge pier, the structural system consists of six parts: pier body 1, anchor plate 2, prestressed steel strand 3, energy dissipation system 4, angle steel 5, and cap 6. The energy dissipation system 4 consists of hollow hexagonal steel tube 7, bolts 8, nuts 9, pads 10, built-in springs 11, and composite foam aluminum 12. It is fixed to both sides of the bottom of the pier body 1 and connected to the angle steel 5.

[0049] Two stiffening ribs 13 are arranged at the lower part of the anchoring plate 2 to resist the bending moment generated by the prestress on the anchoring plate 2; the holes for the passage of the prestressed steel beam 3 are arranged at the corresponding positions of the bearing platform 6 and the pier bottom plate; the prestressed steel beam 3 is connected with the pier bottom plate and is anchored by the nuts 9 at the two ends of the prestressed steel beam 3.

[0050] The energy dissipation system 4 is used to dissipate energy through the yield mechanism generated by inelastic deformation, the plastic hinge formed at the corner of the hollow hexagonal steel pipe 7 and the deformation of the built-in spring 11 and the composite aluminum foam 12;

[0051] The prestressed steel beam 3 is one of the main sources of the stiffness and strength of the structural system, and together with the hollow hexagonal steel pipe 7, it gives the bridge structural system the ability to self-reset to keep the pier in the initial vertical position with little residual horizontal drift, therefore, the prestressed steel beam 3 should always be in tension during cyclic loading, and its axial tensile stress should be below the yield stress.

[0052] The hollow hexagonal steel pipe 7 is made of a memory alloy material to increase the energy dissipation capacity; the hollow hexagonal steel pipe 7 and the angle steel 5 are provided with bolt holes passing through at the corresponding positions, and the reserved hole sleeves 14 are arranged before the cast-in-place connection with the pier;

[0053] The hollow hexagonal steel pipe 7 is connected to the bearing platform 6 through the nuts 9 at the top of the hollow hexagonal steel pipe 7, the internal nuts 9, the gusset plate 10, the built-in spring 11 and the bolts 8 to bear force together; the top of the built-in spring 11 is welded with the gusset plate 10, and the bottom is welded with the hollow hexagonal steel pipe 7 as a whole, and after installation, the gusset plate 10 is welded with the internal nuts 9.

[0054] Under the action of overload, the hollow hexagonal steel pipe 7 in the energy dissipation system 4 forms a series of plastic hinges at its corners, which is the main source of system energy dissipation, and the deformation of the built-in spring 11 and the composite aluminum foam 12 can help the system dissipate energy;

[0055] In addition, it also helps to improve the strength of the system and protect the main components from major damage; tightening the upper and lower nuts 9 makes the hollow hexagonal steel pipe 7 and the bolts 8 bear force together, and the bolts 8 transmit the force generated by the relative movement between the connecting elements to the hexagonal steel pipe, so that it can remain elastic under extreme expected loads; the bolts 8 are used to limit the relative movement between the connecting elements; the nuts 9 and the built-in spring 11 are welded on the gusset plate 10 respectively, and the lower part of the built-in spring 11 is welded with the hollow hexagonal steel pipe 7; the built-in spring 11 helps the hollow hexagonal steel pipe 7 dissipate energy through stretching and compression, and the gusset plate 10 transmits tension or pressure.

[0056] The cast-in-situ concrete in the angle steel 5 is connected with the pier body 1, the cast-in-situ concrete is named as cast-in-situ component 15, and is located between the angle steel 5 and the hollow hexagonal steel pipe 7; the shear anchor 16 is arranged on the bottom surface of the hollow hexagonal steel pipe 7 and the angle steel 5 and is used as a shear key to increase the mechanical bite force, and the bottom surface of the hollow hexagonal steel pipe 7 is poured into one body with the cast-in-situ component 15.

[0057] The bolt 8 is embedded in the bearing platform 6, thereby reducing construction installation steps and cost; the pier body 1 and the bearing platform 6 connected with the angle steel 5 are assembled into one body through a prestress system and can be opened and closed at the junctions; the cylindrical, cuboid or conical pier column joint 17 is arranged at the bottom of the pier body 1, and the embedded cylindrical, cuboid or conical bearing platform cavity 18 is arranged at the corresponding position of the bearing platform 6, thereby providing shear capacity and preventing the contact surface from slipping.

[0058] The ABAQUS is used to model and analyze the new self-resetting pier with the energy dissipation system 4, the concrete is selected to have a C30 strength grade, the steel is selected to have a Q345 grade, the pressure and the cyclic displacement are applied to the top of the pier column, the hysteresis curve at the top point is obtained, and the hysteresis curve at the top of the ordinary pier is compared and analyzed, and the result is as shown in the drawing. Figure 6 The self-resetting component can make the pier return to the plumb position after displacement, thereby reducing residual deformation, the energy dissipation component has certain energy dissipation capacity, has a pinch effect, and therefore the hysteresis curve is flag-shaped, which indicates that the new self-resetting pier with the hollow hexagonal steel pipe energy dissipation system has good seismic performance.

[0059] According to the drawing, a suitable installation method is provided for the new self-resetting pier with the hollow hexagonal steel pipe energy dissipation system, and the installation steps are as follows:

[0060] 1) According to the design requirements of the bridge, the size and material of the pier body 1, the bearing platform 6 and the energy dissipation system 4 are determined;

[0061] 2) The bolt 8 is embedded into the bearing platform 6; the gasket 10, the built-in spring 11 and the hollow hexagonal steel pipe 7 are welded into one body according to the corresponding positions and the hole channels are aligned; the pier body 1 is placed at the corresponding position;

[0062] 3) The angle steel 5 and the hollow hexagonal steel pipe 7 are installed and positioned, the reserved hole channel sleeve 14 is welded to the angle steel 5 and the hollow hexagonal steel pipe 7, and the bolt 8 can pass through the hole channel;

[0063] 4) The gasket 10 is pressed to compress the built-in spring 11, the nut 9 is placed on the gasket 10, the hole channels are aligned and the built-in spring 11 is loosened, the built-in spring 11 is used to stretch the nut 9, and the internal nut 9 is positioned;

[0064] 5), compress the pad plate 10 makes the built-in spring 11 compression empty operation space, tighten the upper and lower nut 9 and loose the built-in spring 11, weld the pad plate 10 and the internal nut 9, make bolt 8 can transmit force and deformation to hollow hexagonal steel tube 7 and built-in spring 11;In hollow hexagonal steel tube 7 fill composite foam aluminum 12 to enhance the energy dissipation of the system;

[0065] 6), on both sides of the pier body 1, angle steel 5 and pier body 1 are integrated by cast-in-place member 15, hollow hexagonal steel tube 7 bottom surface and cast-in-place member 15 are integrated by pouring;

[0066] 7), tension and anchor the prestressed steel strand 3, make the pier body 1 and the pile cap 6 become a whole, installation is completed.

[0067] The above is only the preferred embodiment of the present application, the protection scope of the present application is not only limited to the above-mentioned examples, all technical solutions under the idea of the present application belong to the protection scope of the present application. It should be pointed out that for ordinary skilled in the art, some improvements and decorations without departing from the principles of the present application, should be considered as the protection scope of the present application.

Claims

1. A new self-centering bridge pier with hollow hexagonal steel tube energy dissipation system, characterized in that, The pier body (1), anchor plate (2), prestressed steel beam (3), energy dissipation system (4), angle steel (5) and pile cap (6) are included. The pier body (1) is connected with the angle steel (5) on both sides of the pier bottom, and the pier body (1) and the angle steel (5) are integrally cast by cast-in-place member (15). The pier body (1) is anchored with the pile cap (6) through the anchor plate (2) and the prestressed steel beam (3) arranged on both sides of the pier body (1). The energy dissipation system (4) is arranged on the upper side of the angle steel (5) on both sides. Two holes for the prestressed steel beam (3) to pass through are formed in the anchor plate (2), and two stiffening ribs (13) are arranged at the lower part of the anchor plate (2). Two corresponding holes are formed in the corresponding positions of the pile cap (6), and the prestressed steel beam (3) is arranged in the holes formed in the anchor plate (2) and the pile cap (6). The anchor plate (2) is connected with the pier bottom plate of the pier body (1) and the pile cap (6) through the prestressed steel beam (3) arranged to pass through. Both ends of the prestressed steel beam (3) are anchored by the arranged nut (9). The energy dissipation system (4) includes hollow hexagonal steel pipe (7), nut (9), backing plate (10), built-in spring (11), composite foam aluminum (12) and reserved hole sleeve (14). The hollow hexagonal steel pipe (7) is integrally cast with the cast-in-place member (15). The hollow hexagonal steel pipe (7) is filled with composite foam aluminum (12) in the inner cavity. Bolt holes are formed in the hollow hexagonal steel pipe (7) and between the composite foam aluminums (12) on both sides, and the bolt (8) welded on the pile cap (6) is arranged in the bolt hole. The bolt (8) passes through the reserved hole sleeve (14) and then passes through the hollow hexagonal steel pipe (7) upwards. The nut (9) is arranged on the top end of the bolt (8), the inner side and the outer side of the hollow hexagonal steel pipe (7), and the backing plate (10) is arranged at the lower end of the nut (9) arranged on the inner side. The built-in spring (11) is sleeved on the outer wall of the bolt (8) arranged at the lower end of the backing plate (10).

2. The new self-resetting pier with hollow hexagonal steel pipe energy dissipation system according to claim 1, wherein The pier column joint (17) is arranged on the bottom side of the pier body (1). The pile cap cavity (18) is formed in the center position of the pile cap (6), and the pier column joint (17) is welded in the pile cap cavity (18). One bolt (8) is arranged on the pile cap (6) and on both sides of the pile cap cavity (18).

3. The new self-resetting pier with hollow hexagonal steel pipe energy dissipation system according to claim 1, wherein The bolt hole is formed in the center position of the angle steel (5), One end of the reserved hole sleeve (14) is sleeved on the bottom wall of the hollow hexagonal steel pipe (7), and the other end is inserted into the angle steel (5); The bolt hole is formed through the corresponding positions of the hollow hexagonal steel pipe (7) and the angle steel (5), The shear anchor (16) is arranged on the bottom wall of the hollow hexagonal steel pipe (7) and on both sides of the reserved hole sleeve (14). At least 5 shear anchors (16) are arranged on the angle steel (5) at both ends of the reserved hole sleeve (14).

4. The new self-resetting pier with a hollow hexagonal steel pipe energy dissipation system according to claim 1, characterized in that the material of the hollow hexagonal steel pipe (7) is a memory alloy material.

5. The installation method of the new self-resetting pier system with a hollow hexagonal steel pipe energy dissipation system according to any one of claims 1-4, characterized by: 1) According to the design requirements of the bridge, the size and material of the pier body (1), the pile cap (6) and the energy dissipation system (4) are determined; 2) Embed the bolts (8) in the pile cap (6), weld the gasket (10), the built-in spring (11) and the hollow hexagonal steel pipe (7) into a whole according to the corresponding positions, and ensure that the holes are aligned; Place the pier body (1) in the corresponding position; 3) Install and position the angle steel (5) and the hollow hexagonal steel pipe (7), weld the reserved hole sleeve (14) to the angle steel (5) and the hollow hexagonal steel pipe (7), and ensure that the bolts (8) can pass through the holes; 4) Press the gasket (10) to compress the built-in spring (11), place the nut (9) on the gasket (10), align the holes and loosen the built-in spring (11), use the tensile force of the built-in spring (11) to press the nut (9), and position the internal nut (9); 5) Compress the gasket (10) to compress the built-in spring (11) and leave a spare operation space, tighten the upper and lower nuts (9) and loosen the built-in spring (11), weld the gasket (10) and the internal nut (9), and make the bolts (8) transmit force and deformation to the hollow hexagonal steel pipe (7) and the built-in spring (11); Then, fill the composite aluminum foam (12) in the hollow hexagonal steel pipe (7); 6) On both sides of the pier body (1), the angle steel (5) and the pier body (1) are poured into one body through the cast-in-place member (15), and the bottom surface of the hollow hexagonal steel pipe (7) is poured into one body with the cast-in-place member (15); 7) Tension and anchor the prestressed steel tendon (3) to make the pier body (1) and the pile cap (6) into one body, and the installation is completed. ​

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