Bidirectional limiting anti-beam-falling device easy to maintain for bridge

Abstract

The utility model discloses an easy-to-maintain bidirectional limiting anti-beam-falling device for a bridge, belongs to the field of bridge engineering, and solves the problems of how to improve the anti-seismic property of the bridge and ensure that the anti-beam-falling limiting of the bridge is simultaneously realized in the transverse direction and the longitudinal direction of the bridge. The limiting device comprises a rectangular reserved groove and a rectangular limiting device, the rectangular limiting device is arranged at the bottom of a main beam, the rectangular reserved groove is formed in the top of a pier, the rectangular limiting device is located in the rectangular reserved groove, and a gap is reserved between the periphery of the rectangular limiting device and the rectangular reserved groove. The beam falling prevention device is composed of the rectangular reserved groove and the rectangular limiting stopper, the horizontal displacement reserved space of the beam falling prevention device is reasonably designed, longitudinal and transverse relative displacement occurs between the pier and the main beam under the action of an earthquake, and when the horizontal relative displacement reaches a reserved value, the rectangular limiting stopper is tightly attached to the wall plate of the rectangular reserved groove, so that the beam falling prevention device is prevented from falling off. Relative sliding of the main beam is limited, and beam falling damage caused by excessive displacement of the main beam is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of bridge engineering, and in particular relates to an easy-to-maintain bidirectional position limiting and beam-falling prevention device for bridges. Background Art

[0002] Bridge structures play a pivotal role in transportation. When an earthquake occurs, preventing the devastating damage of roads and bridges is the premise of disaster relief. In the investigation of bridge earthquake damage, it was found that the concrete limit blocks were particularly damaged. The concrete limit blocks were severely damaged, mainly caused by the collision between the main beam and the block. Once the limit blocks crack and fail, they will lose the reliable connection with the bridge piers. As a result, the upper main beam loses its lateral constraint, and the horizontal displacement is too large, resulting in the failure of the bearings and even the beam falling. Beam displacement is an extremely common bridge earthquake damage, which is mainly manifested in longitudinal bridge displacement, transverse bridge displacement and beam body horizontal rotation. Most bridges in the earthquake zone are beam bridges, which generally use plate rubber bearings and pot bearings. Under the action of earthquake, when the friction between the beam and the bearing and the shear strength of the bearing are not enough to resist the horizontal earthquake force, the beam and the bridge pier will slide relative to each other. When the beam displacement is too large and exceeds the lap length of the pier and beam, the main beam loses support and the beam falls, which is an extreme form of damage to the main beam displacement. At present, the block design of domestic bridges is mainly based on lateral limitation, which does not play a role in limiting the relative displacement of the beam along the bridge direction.

[0003] For the seismic design of bridges, a beam-falling prevention device with easy-to-maintain features, including longitudinal and transverse limit targets and horizontal bidirectional limit, has been proposed and developed. This has positive significance for improving the seismic resistance of bridges and avoiding beam-falling damage. Utility Model Content

[0004] The utility model aims to provide a bidirectional limit beam-falling prevention device for a bridge which is easy to maintain, so as to solve the problem of how to improve the earthquake resistance of the bridge and ensure that the bridge can simultaneously achieve the limit beam-falling prevention in the transverse direction and the longitudinal direction.

[0005] The technical solution of the utility model is: a bidirectional limiting and anti-falling beam device for bridges which is easy to maintain, comprising a rectangular reserved groove and a rectangular limiter, wherein the rectangular limiter is arranged at the bottom of the main beam, the rectangular reserved groove is arranged at the top of the bridge pier, the rectangular limiter is located in the rectangular reserved groove, and gaps are reserved around the rectangular limiter and between the rectangular reserved groove.

[0006] As a further improvement of the utility model, a gap is reserved between the bottom of the rectangular stopper and the rectangular reserved groove.

[0007] As a further improvement of the utility model, a plurality of first pins are arranged outside the rectangular reserved groove, and the rectangular reserved groove is embedded in the bridge pier through the first pins.

[0008] As a further improvement of the present invention, the rectangular limiter is a hollow structure.

[0009] As a further improvement of the present invention, the rectangular limiter is made of metal.

[0010] As a further improvement of the utility model, an embedded steel plate is provided at the bottom of the main beam, a plurality of second pins are provided on the embedded steel plate, and the embedded steel plate is embedded in the main beam through the second pins; the rectangular limiter is welded to the embedded steel plate.

[0011] As a further improvement of the utility model, rubber pads are provided around the rectangular stopper and between the rectangular reserved groove.

[0012] As a further improvement of the present invention, multiple groups of rectangular reserved grooves and rectangular limiters are provided.

[0013] As a further improvement of the present invention, the rectangular reserved groove and the rectangular stopper are arranged at a position close to the edge of the pier.

[0014] The beneficial effects of the utility model are as follows: the utility model is composed of a rectangular reserved groove and a rectangular stopper to form a beam-falling prevention device, and the horizontal displacement reserved space of the beam-falling prevention device is reasonably designed. Under normal use, the relative sliding between the main beam and the bridge pier can be satisfied; under the action of an earthquake, longitudinal and transverse relative displacements occur between the bridge pier and the main beam. When the horizontal relative displacement reaches the reserved value, the rectangular stopper fits tightly with the wall plate of the rectangular reserved groove, limiting the relative sliding of the main beam and preventing the main beam from being damaged by falling beams due to excessive displacement. The utility model has a simple structure, low construction and maintenance costs, is easy to maintain, and has great value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic elevation view of a rectangular stopper and a rectangular reserved groove in the utility model;

[0017] Figure 3 It is a plan schematic diagram of a rectangular stopper and a rectangular reserved groove in the utility model.

[0018] In the figure: 1-main beam; 2-bridge pier; 3-rectangular reserved groove; 4-rectangular limiter; 5-embedded steel plate; 6-first pin; 7-rubber pad; 9-second pin. DETAILED DESCRIPTION

[0019] The utility model is described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1-3As shown, a bidirectional limiting and anti-falling beam device for a bridge which is easy to maintain includes a rectangular reserved groove 3 and a rectangular limiter 4. The rectangular limiter 4 is arranged at the bottom of the main beam 1, and the rectangular reserved groove 3 is arranged at the top of the pier 2. The rectangular limiter 4 is located in the rectangular reserved groove 3, and a certain gap is reserved around the rectangular limiter 4 and the rectangular reserved groove 3.

[0021] A gap is reserved between the bottom of the rectangular stopper 4 and the rectangular reserved groove 3 to prevent the rectangular stopper 4 from generating additional friction during the displacement process.

[0022] A plurality of first pins 6 are arranged outside the rectangular reserved groove 3 , and the rectangular reserved groove 3 is pre-buried in the pier 2 through the first pins 6 , which is convenient for daily and post-earthquake maintenance.

[0023] The rectangular stopper 4 is a hollow structure.

[0024] The rectangular stopper 4 is made of metal.

[0025] An embedded steel plate 5 is provided at the bottom of the main beam 1 , and a plurality of second pins 9 are provided on the embedded steel plate 5 . The embedded steel plate 5 is embedded in the main beam 1 through the second pins 9 ; the rectangular limiter 4 is welded to the embedded steel plate 5 .

[0026] Rubber pads 7 are arranged around the rectangular stopper 4 and between the rectangular reserved groove 3 .

[0027] There are multiple sets of rectangular reserved grooves 3 and rectangular stoppers 4.

[0028] The rectangular reserved groove 3 and the rectangular stopper 4 are arranged near the edge of the pier 2, which is easy to install and maintain.

[0029] The construction method is as follows:

[0030] A. When tying the steel bars of pier 2, locate and bury the rectangular reserved groove 3, and then pour the concrete of pier 2 for curing;

[0031] B. Weld the rectangular stopper 4 and the embedded steel plate 5 into a whole, locate and embed the embedded steel plate 5 when tying the steel bars of the beam body 1, and ensure that the embedded steel plate 5 is accurately positioned;

[0032] C. Install the rubber pad in the gap between the rectangular stopper 4 and the rectangular reserved groove 3.

[0033] Embodiment 1,

[0034] The main beam 1 is a single-box single-chamber cast-in-place box beam with inclined webs, and the bridge pier 2 is a vase pier. The cross-sectional dimensions of the top of the bridge pier 2 are 350cm (transverse to the bridge) × 120cm (along the bridge), the plane outline dimensions of the rectangular reserved groove 3 are 32cm × 32cm, the net width of the rectangular reserved groove 3 is 30cm, the outline dimensions of the rectangular stopper 4 are 20cm × 20cm, and the net distance around the rectangular stopper 4 from the inner wall of the rectangular reserved groove 3 is 5cm, that is, the horizontal displacement reserved value of the anti-falling beam device is 5cm.

[0035] Under normal use, the rectangular stopper 4 maintains a sufficient distance from the rectangular reserved groove 3 to satisfy the small range of horizontal sliding of the main beam 1 caused by the temperature and the braking force of the vehicle.

[0036] Under the action of an earthquake, the main beam 1 produces a large horizontal relative displacement in the horizontal direction (transverse to the bridge and along the bridge). When the relative displacement of the rectangular limiter 4 is equal to 5 cm, the rectangular limiter 4 fits tightly with the inner wall of the rectangular reserved groove 3, limiting the relative sliding of the main beam 1 and preventing the main beam 1 from falling and being damaged due to excessive displacement.

[0037] The utility model can realize the relative sliding between the main beam and the bridge pier under normal use by reasonably designing the horizontal displacement reserve value of the anti-falling beam device, and can well limit the relative sliding of the main beam under the action of earthquake, so as to avoid the main beam from falling and being damaged due to excessive displacement. It can not only meet the functional requirements of the bridge structure under normal use, but also solve the problem of realizing the anti-falling beam limit in the transverse direction and the longitudinal direction of the bridge. The utility model has a simple structure, low cost and maintenance cost, and has a good value for promotion and application.

Claims

1. A bidirectional limit beam-falling prevention device for a bridge that is easy to maintain, characterized in that: The invention comprises a rectangular reserved groove (3) and a rectangular stopper (4), wherein the rectangular stopper (4) is arranged at the bottom of the main beam (1), the rectangular reserved groove (3) is arranged at the top of the pier (2), the rectangular stopper (4) is located in the rectangular reserved groove (3), and a gap is reserved around the rectangular stopper (4) and between the rectangular reserved groove (3).

2. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 1 is characterized in that: A gap is reserved between the bottom of the rectangular stopper (4) and the rectangular reserved groove (3).

3. The easy-to-maintain bidirectional position limiting and beam-falling prevention device for a bridge according to claim 1 or 2, characterized in that: A plurality of first pins (6) are arranged outside the rectangular reserved groove (3), and the rectangular reserved groove (3) is pre-buried in the bridge pier (2) via the first pins (6).

4. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 3 is characterized in that: The rectangular stopper (4) is a hollow structure.

5. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 4 is characterized in that: The rectangular stopper (4) is made of metal.

6. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 5 is characterized in that: An embedded steel plate (5) is provided at the bottom of the main beam (1), a plurality of second pins (9) are provided on the embedded steel plate (5), and the embedded steel plate (5) is embedded in the main beam (1) via the second pins (9); the rectangular stopper (4) is welded to the embedded steel plate (5).

7. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 6 is characterized in that: Rubber pads (7) are provided around the rectangular stopper (4) and between the rectangular reserved groove (3).

8. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 7 is characterized in that: The rectangular reserved grooves (3) and rectangular stoppers (4) are provided in multiple groups.

9. The easy-to-maintain bidirectional position-limiting and beam-falling prevention device for a bridge according to claim 1 is characterized in that: The rectangular reserved groove (3) and the rectangular stopper (4) are arranged at positions close to the edge of the pier (2).

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