Upper anchoring type fabricated pier connecting structure

Abstract

The utility model discloses an upper anchoring type assembly type pier connecting structure which comprises a prefabricated pier column and a bearing platform, a mortar cushion layer is laid between the prefabricated pier column and the bearing platform, a plurality of connecting steel bars are poured in the bearing platform, the sides, extending out of the bearing platform, of the connecting steel bars are connected with the prefabricated pier column, the section of the prefabricated pier column is in an inverted-T shape, and a damping unit is arranged in the center of the bottom of the prefabricated pier column. The two sides of the bottom of the damping unit are fixed through threaded anchoring devices, one sides of the two threaded anchoring devices are embedded into a mortar cushion layer, the other sides of the two threaded anchoring devices are in threaded connection with longitudinal main reinforcements through threaded sleeves, and the two longitudinal main reinforcements are connected with the top and the bottom of the prefabricated pier column. And a plurality of outer-layer stirrups are transversely arranged between the inner-layer stirrups and the damping units. The connecting device is convenient and fast to construct, the anti-seismic property of the prefabricated assembled pier is remarkably improved, and the problems that in the prior art, the anti-seismic property and the durability are poor, and repairing and replacing are difficult are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering and relates to an upper-anchored assembled pier connection structure. Background Technique

[0002] Full-bridge prefabrication and assembly is an important way to realize industrial upgrading of bridge engineering in China at present. Most of the current precast bridge substructures are applied in non-seismic areas and low-intensity areas, and the connection structure between precast piers and abutments is the main control factor. Providing a safe, stable and convenient connection structure is the key to the application of precast and assembled piers in medium and high seismic areas, and also determines the application prospect of green and low-carbon construction of precast and assembled piers. At present, the construction method of cast-in-place concrete on site is generally adopted for bridge structures. This construction method has problems such as long on-site maintenance period, large on-site workload and easy traffic congestion. With the advancement of urban traffic and the construction of cross-sea bridges, the demand for rapid bridge construction in limited sites is gradually increasing, and prefabrication and splicing technology is a feasible means to solve the above problems.

[0003] The prestressed tendons in precast and spliced piers greatly increase the integrity and self-resetting ability of the piers. However, the steel bars in each segment of the assembled piers are not connected. Its lateral resistance ability is mainly provided by the tensile force of the prestressed tendons and the compressive force of the concrete. The steel bars in the concrete are less involved in the work, reducing the seismic performance of the assembled piers. And shear slip is likely to occur at the joint positions of the assembled piers under horizontal loads or displacements. At present, energy-dissipating steel bars are generally buried at the splicing joints. The energy-dissipating steel bars dissipate energy through yielding. The energy-dissipating steel bars are arranged in the concrete and cannot be replaced after yielding, and it is difficult to repair after seismic damage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an upper-anchored assembled pier connection structure, which solves the problems of poor seismic performance, poor durability and difficulty in repair and replacement in the prior art.

[0005] The technical solution adopted by the utility model is that the upper-anchored assembled pier connection structure includes a precast pier and an abutment. A mortar cushion layer is laid between the precast pier and the abutment. Several connecting steel bars are cast in the abutment. The connecting steel bars extend out of one side of the abutment and are connected to the precast pier. The cross-section of the precast pier is convex-shaped. A damping unit is arranged at the center of the bottom of the precast pier. Both sides of the bottom of the damping unit are fixed through threaded anchoring devices. One side of the two threaded anchoring devices is embedded in the mortar cushion layer, and the other side is threadedly connected to a longitudinal main steel bar through a threaded sleeve. The two longitudinal main steel bars connect the top and the bottom of the precast pier. Several inner stirrups are transversely arranged at the upper part of the precast pier, and several outer stirrups are transversely arranged between the inner stirrups and the damping unit.

[0006] The characteristics of the utility model also lie in:

[0007] The connecting steel bars are L-shaped, and the bent part of the connecting steel bars is relatively embedded in the bearing platform.

[0008] Metal corrugated pipes are embedded in the precast pier columns. The metal corrugated pipes correspond to the positions of the connecting steel bars one by one, and the connecting steel bars are fixedly connected inside the metal corrugated pipes.

[0009] An outer steel pipe is pasted on the bottom boss and side wall of the precast pier column, and the outer steel pipe is integrally formed.

[0010] The surface of the outer steel pipe is covered with an anti-corrosion coating, and the material of the outer steel pipe is Q235 steel.

[0011] The damping unit includes two groups of dampers. One group of dampers is in the shape of "I". The top of the damper is fixedly connected to the upper connecting plate of the damper, and the bottom of the damper is fixedly connected to the lower connecting plate of the damper.

[0012] On both sides of the recessed part of each group of dampers along the horizontal direction, limiting plates are fixedly connected. Anti-buckling splints are arranged on both sides of the damper and the limiting plate along the width direction, and the two anti-buckling splints are fastened by bolts.

[0013] The upper connecting plates of the two groups of dampers are connected by threaded steel bars. The threaded steel bars penetrate through the upper connecting plates of the dampers and are fixedly connected to the precast pier columns at both ends.

[0014] Between the lower connecting plate of each group of dampers and the bearing platform, there is a connection by damping unit connecting steel bars. The damping unit connecting steel bars are arranged on both sides of the joint between the anti-buckling splint and the lower connecting plate of the damper.

[0015] A number of stiffening plates are arranged at the joints of each group of dampers with the upper connecting plate and the lower connecting plate of the damper.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The present utility model adopts a precast and assembled bridge pier connection structure, which is safe and reliable in structure, can ensure the effective connection between the bottom of the precast and assembled bridge pier and the bearing platform. The enlarged section at the bottom of the pier transfers the seismic control section, effectively improving its seismic performance. At the same time, it significantly improves the energy dissipation capacity of the precast and assembled bridge pier under earthquake action, better protecting the main body of the bridge pier during an earthquake and preventing the bridge pier from undergoing large plastic damage. The setting of replaceable damping units enables the bridge pier to continue to be put into use after replacing the dampers after an earthquake, which is beneficial to the post-earthquake rescue and repair of the assembled bridge pier. In addition, the outer steel pipe can effectively inhibit the development of cracks at the bottom of the bridge pier and at the same time protect the joint from rainwater infiltration, improving its durability. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the bridge pier connection structure of the upper-anchored assembled bridge pier connection structure of the present utility model;

[0019] Figure 2Schematic diagram of the threaded anchoring device for the upper-anchored precast pier connection structure of the present utility model;

[0020] Figure 3 Schematic diagram of the buckling restraint splint removed on one side of the damping unit of the upper-anchored precast pier connection structure of the present utility model;

[0021] Figure 4 3D solid schematic diagram of the damping unit of the upper-anchored precast pier connection structure of the present utility model.

[0022] In the figure: 1. Cap, 2. Connecting steel bars, 3. Metal corrugated pipe, 4. Inner stirrups, 5. Outer stirrups, 6. Outer steel pipe, 7. Threaded anchoring device, 8. Precast pier column, 9. Longitudinal main steel bars, 10. Mortar cushion layer, 11. Damping unit, 11-1. Damper, 11-2. Upper connecting plate of the damper, 11-3. Lower connecting plate of the damper, 11-4. Buckling restraint splint, 11-5. Limiting plate, 11-6. Connecting steel bars of the damper, 11-7. Threaded steel bars, 11-8. Stiffening plate. Specific implementation manners

[0023] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0024] Embodiment 1

[0025] As Figure 1 shown, the upper-anchored precast pier connection structure includes a precast pier column 8 and a cap 1. A mortar cushion layer 10 is laid between the precast pier column 8 and the cap 1. A number of connecting steel bars 2 are cast in the cap 1. One side of the connecting steel bars 2 extending out of the cap 1 is connected to the precast pier column 8. The cross-section of the precast pier column 8 is convex-shaped. A damping unit 11 is provided at the center of the bottom of the precast pier column 8. Both sides of the bottom of the damping unit 11 are fixed by a threaded anchoring device 7. The structure of the threaded anchoring device 7 is as Figure 2 shown. One side of the two threaded anchoring devices 7 is embedded in the mortar cushion layer 10, and the other side is threadedly connected to the longitudinal main steel bars 9 through a threaded sleeve. The two longitudinal main steel bars 9 connect the top and bottom of the precast pier column 8. A number of inner stirrups 4 are horizontally arranged on the upper part of the precast pier column 8. A number of outer stirrups 5 are horizontally arranged between the inner stirrups 4 and the damping unit 11. The longitudinal main steel bars 9 are made of HRB400 threaded steel bars.

[0026] The connecting steel bars 2 are L-shaped, and the bent part of the connecting steel bars 2 is relatively embedded in the cap 1. Metal corrugated pipes 3 are embedded in the precast pier column 8, and the positions of the metal corrugated pipes 3 correspond to those of the connecting steel bars 2 one by one. The connecting steel bars 2 are fixedly connected inside the metal corrugated pipes 3. The bottom convex platform and side wall of the precast pier column 8 are pasted with an outer steel pipe 6. The outer steel pipe 6 is integrally formed, and the surface of the outer steel pipe 6 is covered with an anti-corrosion coating. The material of the outer steel pipe 6 is Q235 steel.

[0027] Example 2

[0028] Based on the upper-anchored assembled pier connection structure of Example 1, the specific setting of the damping unit 11 is further included, as Figure 3 shown. The damping unit 11 includes two groups of dampers 11-1. One group of dampers 11-1 is in the shape of "I". The top of the damper 11-1 is fixedly connected to the upper connecting plate 11-2 of the damper, and the bottom of the damper 11-1 is fixedly connected to the lower connecting plate 11-3 of the damper. On both sides of the recessed part of each group of dampers 11-1 along the horizontal direction, limiting plates 11-5 are fixedly connected. Anti-buckling splints 11-4 are arranged on both sides of the damper 11-1 and the limiting plate 11-5 along the width direction, and the two anti-buckling splints 11-4 are fastened by bolts.

[0029] As Figure 4 shown, the upper connecting plates 11-2 of the two groups of dampers are connected by threaded steel bars 11-7. The threaded steel bars 11-7 penetrate through the upper connecting plates 11-2 of the dampers and are fixedly connected to the precast pier column 8 at both ends. Between each group of lower connecting plates 11-3 of the dampers and the bearing platform 1, a damper connecting steel bar 11-6 is arranged for connection. The damper connecting steel bar 11-6 is arranged on both sides of the joint between the anti-buckling splint 11-4 and the lower connecting plate 11-3 of the damper. A number of stiffening plates 11-8 are arranged at the joints of each group of dampers 11-1 with the upper connecting plate 11-2 and the lower connecting plate 11-3 of the damper.

[0030] Example 3

[0031] The specific implementation process of the upper-anchored assembled pier connection structure is as follows:

[0032] 1. Fabrication of the bearing platform 1, specifically by tying the steel bar skeletons and connecting steel bars 2 inside the bearing platform 1. The connecting steel bars 2 are tied and fixed to the steel bar skeletons of the bearing platform 1 with iron wires and extend above the bearing platform 1. Install the formwork battens and panels, pour concrete, cure for 14 days, remove the formwork after curing to the specified strength, and clean the formwork.

[0033] 2. Fabrication of the precast pier column 8 in the workshop. A threaded anchoring device 7 is arranged inside the precast pier column 8. First, tie the steel bar skeleton of the precast pier column 8, and use a torque wrench to tighten the threaded sleeve to make a reliable connection with the threaded anchoring device 7. Install the formwork battens and panels, carry out concrete pouring and curing, remove the formwork after curing to the specified strength, and clean the formwork.

[0034] 3. Transport the cured precast pier column to the construction site and carry out the splicing construction with the bearing platform.

[0035] 4. Before assembly, roughen, clean debris and moisten the splicing surfaces of the top of the bearing platform and the bottom of the precast pier column in sequence; install positioning pads, and adjust the verticality of the pier column during trial assembly; lay a mortar cushion before formal assembly and complete the assembly in one-time mortar placement; let the mortar sit for 1 day. Then grout the metal corrugated pipe 3, and the grouting material is pressed in from the lower grouting hole and the valve is closed to stop grouting after stable grouting from the upper slurry outlet.

[0036] 5. After the grouting material reaches the design strength, install the outer steel pipe 6. Before installation, clean the dust on the outside of the pier column and apply epoxy resin on the outside. The surface of the outer steel pipe 6 is covered with an anti-corrosion coating.

[0037] 6. The damping unit is replaceable. Install the damping units 11 on the opposite sides of the outer steel pipe 6. Slot and drill holes on the upper connecting plate 11-2 of the damper 11-1. The threaded steel bar 11-7 penetrates through the upper connecting plate 11-2 of the damper and is fixedly connected to the precast pier column 8 at both ends. Limit plates 11-5 are arranged on both sides of the damper 11-1. The damper 11-1 and the limit plates 11-5 are clamped between two buckling-restrained plates, and the two buckling-restrained plates are fixedly connected by bolts.

[0038] 7. Install stiffening plates 11-8 at the joints between the buckling-restrained plates 11-4 and the lower connecting plate 11-3 of the damper. Install the damping units 11 on the opposite sides of the outer steel pipe 6. The damper connecting steel bars 11-6 are implanted into the bearing platform 1 and connected to the bearing platform 1. Reserve holes on the upper connecting plate 11-2 of the damper 11-1 at the top of the damper, and implant threaded steel bars 11-7 to realize the connection between the damper 11-1 and the bridge pier.

Claims

1. The upper anchor type assembled pier connection structure is characterized by: The invention comprises a prefabricated pier column (8) and a cap (1), a mortar cushion layer (10) is laid between the prefabricated pier column (8) and the cap (1), a plurality of connecting steel bars (2) are cast in the cap (1), the connecting steel bars (2) extend out of one side of the cap (1) and are connected to the prefabricated pier column (8), the cross section of the prefabricated pier column (8) is in a convex shape, a damping unit (11) is arranged at the center of the bottom of the prefabricated pier column (8), the two sides of the bottom of the damping unit (11) are fixed by threaded anchoring devices (7), one side of the two threaded anchoring devices (7) is embedded in the mortar cushion layer (10), and the other side is threadedly connected to a longitudinal main bar (9) by a threaded sleeve, the two longitudinal main bars (9) connect the top and the bottom of the prefabricated pier column (8), a plurality of inner layer stirrups (4) are transversely arranged on the upper part of the prefabricated pier column (8), and a plurality of outer layer stirrups (5) are transversely arranged between the inner layer stirrups (4) and the damping unit (11).

2. The upper anchor type assembled pier connection structure according to claim 1 is characterized in that: The connecting steel bar (2) is L-shaped, and the bent portion of the connecting steel bar (2) is relatively embedded in the support platform (1).

3. The upper anchor type assembled pier connection structure according to claim 1 is characterized in that: A metal corrugated pipe (3) is pre-buried in the prefabricated pier column (8), the metal corrugated pipe (3) corresponds to the connection steel bars (2) in position, and the connection steel bars (2) are fixedly connected inside the metal corrugated pipe (3).

4. The upper anchor type assembled pier connection structure according to claim 1 is characterized in that: The bottom boss and the side wall of the prefabricated pier column (8) are bonded with an outer steel pipe (6), and the outer steel pipe (6) is integrally formed.

5. The upper anchor type assembled pier connection structure according to claim 4 is characterized in that: The surface of the outer steel pipe (6) is covered with an anti-corrosion coating, and the material of the outer steel pipe (6) is Q235 steel.

6. The upper anchor type assembled pier connection structure according to claim 1 is characterized in that: The damping unit (11) comprises two groups of dampers (11-1), wherein one group of dampers (11-1) is of an "I" type, the top of the damper (11-1) is fixedly connected to an upper damper connecting plate (11-2), and the bottom of the damper (11-1) is fixedly connected to a lower damper connecting plate (11-3).

7. The upper anchor type assembled pier connection structure according to claim 6 is characterized in that: Each group of dampers (11-1) is fixedly connected to limit plates (11-5) on both sides of the recessed portion in the horizontal direction, and anti-buckling splints (11-4) are provided on both sides of the dampers (11-1) and the limit plates (11-5) in the width direction, and the two anti-buckling splints (11-4) are fastened by bolts.

8. The upper anchor type assembled pier connection structure according to claim 7 is characterized in that: The two groups of damper upper connecting plates (11-2) are connected via threaded steel bars (11-7), and the threaded steel bars (11-7) penetrate the damper upper connecting plates (11-2) and are fixedly connected to prefabricated pier columns (8) at both ends.

9. The upper anchor type assembled pier connection structure according to claim 8, characterized in that: A damper connecting steel bar (11-6) is provided between each group of the damper lower connecting plates (11-3) and the bearing platform (1), and the damper connecting steel bar (11-6) is provided on both sides of the joint between the anti-buckling clamp plate (11-4) and the damper lower connecting plate (11-3).

10. The upper anchor type assembled pier connection structure according to claim 9, characterized in that: A plurality of stiffening plates (11-8) are arranged at the connection between each group of dampers (11-1) and the damper upper connecting plate (11-2) and the damper lower connecting plate (11-3).

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