A shock-absorbing and energy-consuming assembled swing pier component and construction method thereof

Abstract

The present invention relates to the field of earthquake-resistant safety technology, and in particular to a shock-absorbing and energy-absorbing assembled swing pier component and a construction method thereof, comprising a steel box, a swing structure, a rubber layer and a steel sleeve, wherein the steel box is a hollow box structure with an open top, and its longitudinal section is composed of a square structure at the top and an isosceles trapezoidal structure at the bottom that is wide at the top and narrow at the bottom; the bottom of the steel box is fixed to a base steel plate, and the base steel plate is connected to a foundation pedestal below it through anchor bolts; the swing structure is sleeved inside the steel box, and a gap for setting a rubber layer is provided between the swing structure and the steel box; the steel sleeve is sleeved on a connecting column at the axial top of the swing structure, and the swing structure is connected to the pier through the steel sleeve and the pier steel bars arranged along the circumference of the steel sleeve. The present invention causes the pier to swing to release the bending moment at the top and bottom of the pier, has a simple structure, clear force, and has efficient energy dissipation and self-reset capabilities.

Description

Technical Field

[0001] The present invention relates to the field of earthquake-resistant safety technology, and in particular to a shock-absorbing and energy-consuming assembled swing pier component and a construction method thereof. Background Art

[0002] In recent years, destructive earthquakes have occurred frequently in my country, especially since the 21st century, when the number of earthquakes has increased significantly. Bridge structures are easily damaged in earthquakes, and bridges, as hub projects of transportation lifelines, play an extremely important role in post-earthquake rescue. Therefore, ensuring the seismic performance of bridges and reducing earthquake risks are one of the core tasks of disaster prevention.

[0003] As an important component of the bridge structure, once the pier is damaged, it will seriously affect the stability and normal use function of the bridge. Therefore, the pier is one of the important factors affecting its seismic performance. The seismic design of bridge piers nowadays mostly adopts ductile seismic design, but the damage, replacement and repair of the plastic hinge area of ​​the pier are difficult, especially for medium and short piers, which are prone to shear failure. It is obviously not economical to simply increase the cross-sectional area and increase the amount of steel bars, and the ductility cannot be guaranteed. The existing prefabricated segment splicing piers mostly use the same prefabricated bridge segment splicing technology. Although they have good axial shock absorption capacity, when subjected to accidental loads such as earthquakes and impacts, they are very likely to be damaged along the connection. The residual deformation after the disaster is very large, which greatly reduces their seismic performance. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a shock-absorbing and energy-absorbing assembled swing pier component and a construction method thereof. The swing structure swings at the epicenter to release the bending moment at the pier top and bottom. After the earthquake, it only needs to replace the shear keys to put it into use.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0006] The invention discloses a shock-absorbing and energy-consuming assembled swing pier component, comprising a steel box, a swing structure, a rubber layer and a steel sleeve.

[0007] The steel box is a hollow box structure with an open top, and its longitudinal section is composed of a square structure at the top and an isosceles trapezoidal structure at the bottom that is wide at the top and narrow at the bottom; the bottom of the steel box is fixed to a base steel plate, and the base steel plate is connected to the foundation pedestal below it through anchor bolts;

[0008] The swing structure is sleeved inside the steel box, and a gap for setting the rubber layer is provided between the swing structure and the steel box;

[0009] The steel sleeve is sleeved on the connecting column at the axial top of the swing structure, and the swing structure is connected to the upper pier through the steel sleeve and the pier reinforcements arranged along the circumference of the steel sleeve.

[0010] The steel sleeve is an annular structure, and a "well"-shaped spacer is arranged in the middle thereof.

[0011] A shear key is arranged between the top of the inner cavity of the steel box and the top of the swing structure, and a gap is arranged between the shear key and the end of the rubber layer.

[0012] The shear key is in a cylindrical structure, and a groove is provided in the middle of the outer wall along the circumference thereof.

[0013] The steel box is fixed with a support plate along its circumference.

[0014] A water retaining plate is provided between the connecting column of the swing structure and the top of the steel box.

[0015] The invention discloses a construction method of a shock-absorbing and energy-consuming assembled swing pier component, comprising the following steps:

[0016] S1: Foundation cap construction: pour concrete at the bottom of the cap until the bottom of the steel mesh, tie up local reinforcement to make a steel mesh, set up steel bars between the two layers of steel mesh to ensure the correct position of the fixed steel bars. Fix the embedded steel plate and continue pouring concrete on the top of the cap;

[0017] S2: Installation of shock-absorbing and energy-absorbing assembled swing pier components: Place the shock-absorbing and energy-absorbing assembled swing pier components on the cap, tighten and fix the anchor bolts, and the swing pier components and the cap can be effectively connected;

[0018] S3: Construction of superstructure: arranging steel bars for piers, erecting external formwork for piers, pouring concrete in steel boxes, pouring concrete for bridge bodies, demoulding, and concrete curing.

[0019] In the step S3, the pier reinforcement is arranged by arranging longitudinal reinforcement along the circumferential direction of the steel sleeve, and arranging stirrups thereon according to design requirements;

[0020] Support the outer formwork of the pier body: calculate the number of formwork blocks according to the size of the pier body, and support the formwork in sequence according to the principle of formwork correspondence, uniform staggering of shrink formwork and wedge formwork;

[0021] Pouring of bridge body concrete: During the pouring process, the debris in the formwork should be cleared in time, and the concrete should be poured in layers and vibrated.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention realizes the swaying motion of the bridge pier under the action of earthquake, converts the kinetic energy into gravitational potential energy, reduces the structural earthquake period, dissipates the earthquake energy, and has excellent earthquake resistance;

[0024] 2. The present invention uses the limiting effect of the steel box to make the bridge pier swing with a controllable amplitude, which is beneficial to the stability of the superstructure;

[0025] 3. The present invention is a prefabricated bridge pier with simple structure, clear force, and convenient construction and installation;

[0026] 4. The bottom of the swing structure of the present invention is an enlarged reinforced concrete section, which can ensure the rigidity of the bridge structure under normal use;

[0027] 5. When the swing structure of the present invention tilts, the gravity of the upper structure is much greater than the vertical component of the supporting force provided by the inclined surface of the steel box, so it has a strong self-reset ability, effectively controls the residual deformation of the bridge pier, and ensures the normal use of the bridge pier after the earthquake;

[0028] 6. The present invention, because the pier-steel box is a separate system, can effectively release the bending moment at the bottom of the pier, reduce the seismic force borne by the pier structure, have a good seismic isolation effect, and also avoid shear damage at the connection. Without increasing the cross-sectional area and the amount of steel bars used, it has better ductility;

[0029] 7. The present invention is easy to implement, has a wide range of applications, and has good economic benefits.

[0030] 8. The present invention can meet the requirements of multi-level defense and the rigidity requirements during normal operation; it can limit displacement through shear keys to maintain stability in common earthquakes; it can dissipate energy and reduce shock in rare earthquakes and can reset itself.

[0031] 9. The present invention greatly increases the stability of the pier itself by arranging support plates along the circumference of the swaying pier;

[0032] 10. When the structure of the present invention sways, the inclined surface is in surface-to-surface contact, the pressure-bearing area is large, the pressure is effectively dispersed, and the possibility of crushing the edge concrete due to stress concentration is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 is a cross-sectional view of the present invention;

[0035] Figure 3 It is a construction process flow chart of the present invention.

[0036] In the figure: 1 steel box, 2 rocking structure, 3 rubber layer, 4 steel sleeve, 5 support plate, 6 anchor bolts, 7 water retaining plate, 8 pier steel bars, 9 foundation cap, 10 shear key, 11 base steel plate. DETAILED DESCRIPTION

[0037] The present invention is further described below:

[0038] See also Figure 1-3 ,

[0039] The present invention discloses a shock-absorbing and energy-consuming assembled swing pier component, comprising a steel box 1, a swing structure 2, a rubber layer 3 and a steel sleeve 4.

[0040] The steel box 1 is a hollow box structure with an open top, and its longitudinal section is composed of a square structure at the top and an isosceles trapezoidal structure at the bottom that is wide at the top and narrow at the bottom; the bottom of the steel box 1 is fixed on a base steel plate 11, and the base steel plate 11 is connected to the foundation pedestal 9 below it through anchor bolts 6;

[0041] The swing structure 2 is mounted inside the steel box 1, and a gap is provided between the swing structure 2 and the steel box 1 for arranging the rubber layer 3. By arranging the rubber layer 3, the bridge pier can swing freely under the action of a strong earthquake.

[0042] The steel sleeve 4 is sleeved on the connecting column at the axial top of the swing structure 2. The swing structure 2 is connected to the pier through the steel sleeve 4 and the pier steel bars 8 arranged circumferentially along the steel sleeve 4. The steel sleeve 4 is an annular structure, and a "well"-shaped spacer is provided in the middle, so that the steel sleeve 4 has a nine-square structure, which can ensure the strength of the connection.

[0043] A shear key 10 is provided between the top of the inner cavity of the steel box 1 and the top of the swing structure 2 , and a gap is provided between the shear key 10 and the end of the rubber layer 3 .

[0044] The shear key 10 is in a cylindrical structure, and a groove is provided in the middle of its outer wall along its circumference to ensure shearing at the middle groove of the shear key 10 .

[0045] The steel box 1 is fixed with a support plate 5 along its circumference, which greatly increases the stability of the pier itself.

[0046] A water retaining plate 7 is provided between the connecting column of the swing structure 2 and the top of the steel box 1 to prevent the infiltration of river water or rain water.

[0047] Working principle: Under normal use, the enlarged reinforced concrete section at the bottom of the swing structure 2 can ensure the stiffness of the bridge structure under normal use. Under slight disturbance, the bridge can be prevented from swinging due to the deadweight of its upper structure and the restraining force of the shear key 10, thus maintaining the stability of the bridge pier.

[0048] Under common earthquakes, the sway structure 2 swings slightly, and the shear keys 10 on both sides limit the displacement, and the deadweight of the upper structure keeps it stable under common earthquake conditions;

[0049] In a rare earthquake, the shear key 10 is cut off. Due to the gap between the swing structure 2 and the steel box 1, the bridge pier will swing under the action of the earthquake force. Taking the bridge pier tilting to the left as an example, under the action of the earthquake force, the bridge pier squeezes the rubber layer 3 on the left side, tilts to the left, lifts the upper structure, and the kinetic energy is converted into gravitational potential energy. The pressure is borne by the left inclined surface and the left vertical plane. At this time, since the gravity of the upper structure is much greater than the vertical component of the supporting force provided by the inclined surface of the steel box 1, it has a strong self-resetting ability. Due to the limiting effect of the steel box 1, the swing amplitude is controllable, and the purpose of energy dissipation and shock reduction is achieved through the swing of the bridge pier. The swing structure-steel box separation system plays a role in hindering the downward transmission of seismic waves and plays a role in seismic isolation.

[0050] The invention discloses a construction method of a shock-absorbing and energy-consuming assembled swing pier component, comprising the following steps:

[0051] 1. Foundation cap construction: pour concrete at the bottom of the cap until the bottom of the steel mesh, tie up local reinforcement to make a steel mesh, set up steel bars between the two layers of steel mesh to ensure the correct position of the fixed steel bars. Fix the embedded steel plate and continue to pour concrete on the top of the cap.

[0052] 2. Installation of shock-absorbing and energy-absorbing assembled swing pier components: Place the shock-absorbing and energy-absorbing assembled swing pier components on the pedestal, tighten and fix the anchor bolts, and the swing pier components and the pedestal can be effectively connected.

[0053] 3.Superstructure construction:

[0054] 3.1 Arrangement of pier reinforcement: longitudinal reinforcement is arranged along the circumferential direction of the steel sleeve, and stirrups are arranged on top according to the design requirements.

[0055] 3.2 Support the external formwork of the pier body: calculate the number of formwork blocks according to the size of the pier body, and support the formwork in sequence according to the principle of corresponding formwork, and evenly staggered shrinkage formwork and wedge-shaped formwork.

[0056] 3.3 Support the external formwork of the pier body: calculate the number of formwork blocks according to the size of the pier body, and support the formwork in sequence according to the principle of corresponding formwork, and evenly staggered shrinkage formwork and wedge-shaped formwork.

[0057] 3.4 Pouring of bridge body concrete: During the pouring process, the debris in the formwork should be cleared in time, and the concrete should be poured in layers and vibrated.

[0058] 3.5 Demoulding and concrete curing

[0059] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A shock-absorbing and energy-absorbing assembled swing pier component, characterized in that: The invention comprises a steel box (1), a swing structure (2), a rubber layer (3) and a steel sleeve (4); the steel box (1) is a hollow box structure with an open top, and its longitudinal section is composed of a square structure at the top and an isosceles trapezoidal structure at the bottom that is wide at the top and narrow at the bottom; the bottom of the steel box (1) is fixed to a base steel plate (11), and the base steel plate (11) is connected to a foundation pedestal (9) below it via anchor bolts (6); the swing structure (2) is sleeved inside the steel box (1), and a gap is provided between the steel box (2) and the steel box (1) for arranging the rubber layer (3); the steel sleeve (4) is sleeved on a connecting column at the axial top of the swing structure (2), and the swing structure (2) The upper pier is connected to the steel sleeve (4) and the pier reinforcement (8) arranged along the circumference of the steel sleeve (4); the steel sleeve (4) is an annular structure, and a "well"-shaped spacer is provided in the middle thereof; a shear key (10) is provided between the top of the inner cavity of the steel box (1) and the top of the swing structure (2), and a gap is provided between the shear key (10) and the end of the rubber layer (3); the shear key (10) is a cylindrical structure, and a groove is provided in the middle of its outer wall along its circumference; a support plate (5) is installed and fixed to the steel box (1) along its circumference; a water retaining plate (7) is provided between the connecting column of the swing structure (2) and the top of the steel box (1); The construction method of the shock-absorbing and energy-absorbing assembled swing pier component comprises the following steps: S1: Foundation cap construction: pour concrete at the bottom of the cap until the bottom of the steel mesh, tie local reinforcement to make a steel mesh, set up steel bars between the two layers of steel mesh, ensure the correct position of the fixed steel bars, fix the embedded steel plate, and continue to pour concrete on the top of the cap; S2: Installation of shock-absorbing and energy-absorbing assembled swing pier components: Place the shock-absorbing and energy-absorbing assembled swing pier components on the cap, tighten and fix the anchor bolts, and the swing pier components and the cap can be effectively connected; S3: Superstructure construction: arranging bridge pier reinforcement, supporting pier body external formwork, pouring concrete in steel box, pouring bridge body concrete, demoulding, and concrete curing; The pier reinforcement is configured as follows: longitudinal reinforcement is configured along the circumferential direction of the steel sleeve, and stirrups are configured thereon according to design requirements; Support the outer formwork of the pier body: calculate the number of formwork blocks according to the size of the pier body, and support the formwork in sequence according to the principle of formwork correspondence, uniform staggering of shrink formwork and wedge formwork; Pouring of bridge body concrete: During the pouring process, the debris in the formwork should be cleared in time, and the concrete should be poured in layers and vibrated.

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