Hidden two-way limiting anti-beam-falling device for bridge

Abstract

The utility model discloses a hidden two-way 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 bridge direction and the longitudinal bridge direction. The cross-shaped limiting device comprises a cross-shaped groove and a cross-shaped limiting device, the cross-shaped groove is formed in the top of a bridge pier, the cross-shaped limiting device is arranged at the bottom of a main beam, the cross-shaped limiting device is located in the cross-shaped groove, and gaps are reserved between the side portion and the end portion of the cross-shaped limiting device and the cross-shaped groove. The cross-shaped groove and the cross-shaped limiting stopper form the anti-beam-falling device, the horizontal displacement reserved space of the anti-beam-falling 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 cross-shaped limiting stopper is tightly attached to the inner wall of the cross-shaped groove, so that the anti-beam-falling 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 a hidden bidirectional limiting anti-falling beam device for bridges. Background Art

[0002] Beam displacement is a very common bridge earthquake damage, which mainly manifests as longitudinal displacement, transverse displacement and beam rotation. Under the comprehensive consideration of safety, practicality and economy, most domestic bridge systems are beam bridges, and plate rubber bearings and pot bearings are generally used. However, under the action of earthquakes, the friction between the beam and the bearing and the shear strength of the bearing are not enough to resist the large horizontal earthquake force, causing the beam and the bridge pier to slide relative to each other. When the relative displacement of the beam is too large, the main beam will lose its effective vertical support and fall.

[0003] In the current seismic design code for bridges in my country, limit blocks are mainly designed according to structural measures, and usually have only lateral limit functions. In the investigation literature of a large number of bridge structures damaged by earthquakes, it is shown that there are many cases of beam failure in the longitudinal direction of the bridge, and there are few cases of bridge structures with lateral limit blocks experiencing beam failure in the transverse direction of the bridge or large transverse displacement of the beam relative to the pier, which shows that the block plays an important role as a transverse limit device in earthquakes.

[0004] Therefore, on the premise of meeting the requirements of domestic bridge design specifications, the limit blocks are rationally optimized and designed so that they can simultaneously meet the bidirectional horizontal limit functions in the longitudinal and transverse directions of the bridge, which can effectively improve the seismic resistance of the bridge, avoid beam falling damage, and meet the basic performance goal of not collapsing in a major earthquake. Utility Model Content

[0005] The utility model aims to provide a hidden bidirectional limiting anti-falling beam device for a bridge, so as to solve the problem of how to improve the anti-seismic performance of the bridge and ensure that the anti-falling beam limitation of the bridge is achieved in both the transverse direction and the longitudinal direction.

[0006] The technical solution of the utility model is: a hidden two-way limiting anti-falling beam device for bridges, comprising a cross-shaped groove and a cross-shaped limiter, the cross-shaped groove is arranged on the top of the pier, the cross-shaped limiter is arranged on the bottom of the main beam, the cross-shaped limiter is located in the cross-shaped groove, and gaps are reserved between the side and end of the cross-shaped limiter and the cross-shaped groove.

[0007] As a further improvement of the utility model, a gap is reserved between the bottom of the cross-shaped limiter and the cross-shaped groove.

[0008] As a further improvement of the utility model, a plurality of first pins are arranged on the outer side of the cross-shaped groove, and the cross-shaped groove is pre-buried in the bridge pier through the first pins.

[0009] 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 cross-shaped limiter is welded to the embedded steel plate.

[0010] As a further improvement of the utility model, a rubber pad is provided between the side of the cross-shaped limiter and the cross-shaped groove.

[0011] As a further improvement of the utility model, a plurality of groups of cross-shaped grooves and cross-shaped limiters are provided.

[0012] As a further improvement of the utility model, the cross-shaped groove and the cross-shaped limiter are arranged at the central position of the pier.

[0013] The beneficial effects of the utility model are as follows: the utility model is composed of a cross-shaped groove and a cross-shaped limiter to form an anti-falling beam device, and the horizontal displacement reserved space of the anti-falling beam device is reasonably designed. Under normal use, the relative sliding between the main beam and the pier can be satisfied; under the action of an earthquake, longitudinal and transverse relative displacements occur between the pier and the main beam. When the horizontal relative displacement reaches the reserved value, the cross-shaped limiter fits tightly with the inner wall of the cross-shaped groove, limiting the relative sliding of the main beam and avoiding the main beam from falling due to excessive displacement. In the cross-shaped limiter, when the mutually perpendicular single limbs are mutually stiffening ribs and are subjected to transverse force, the longitudinal plate is the stiffening rib of the transverse plate; when subjected to longitudinal force, the transverse plate is the stiffening rib of the longitudinal plate, thereby improving the horizontal bearing capacity and saving the material consumption of the components. The anti-falling beam device is arranged at the center of the top of the pier. Due to the shielding of the pier outline and the support, the anti-falling beam device is in a hidden state, and the landscape effect under the bridge is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic elevation view of the cross-shaped groove and the cross-shaped limiter in the utility model;

[0016] Figure 3 It is a plan view of the cross-shaped groove and the cross-shaped limiter in the utility model.

[0017] In the figure: 1-main beam; 2-bridge pier; 3-cross groove; 4-cross limiter; 5-embedded steel plate; 6-first pin; 7-rubber pad; 8-second pin. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-3As shown, a hidden two-way limiting anti-falling beam device for a bridge includes a cross-shaped groove 3 and a cross-shaped limiter 4. The cross-shaped groove 3 is arranged on the top of the pier 2, and the cross-shaped limiter 4 is arranged on the bottom of the main beam 1. The cross-shaped limiter 4 is located in the cross-shaped groove 3, and a certain gap is reserved between the side and end of the cross-shaped limiter 4 and the cross-shaped groove 3.

[0020] A gap is reserved between the bottom of the cross-shaped stopper 4 and the cross-shaped groove 3 to avoid additional friction between the cross-shaped stopper 4 and the cross-shaped groove 3 during the displacement process.

[0021] A plurality of first pins 6 are arranged on the outer side of the cross-shaped groove 3 , and the cross-shaped groove 3 is pre-buried in the pier 2 through the first pins 6 .

[0022] An embedded steel plate 5 is provided at the bottom of the main beam 1 , and a plurality of second pins 8 are provided on the embedded steel plate 5 . The embedded steel plate 5 is embedded in the main beam 1 through the second pins 8 ; the cross-shaped limiter 4 is welded to the embedded steel plate 5 .

[0023] A rubber pad 7 is provided between the side of the cross-shaped limiter 4 and the cross-shaped groove 3 .

[0024] There are multiple groups of cross-shaped grooves 3 and cross-shaped limiters 4.

[0025] The cross-shaped groove 3 and the cross-shaped limiter 4 are arranged at the center of the pier 2 .

[0026] The construction method is as follows:

[0027] A. When tying the steel bars of the bridge pier 2, locate and bury the cross-shaped groove 3, and then pour the concrete of the bridge pier 2 for maintenance;

[0028] B. Weld the cross-shaped 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;

[0029] C. Install the rubber pad in the gap between the side of the cross-shaped limiter 4 and the cross-shaped groove 3.

[0030] Embodiment 1,

[0031] 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 cross-shaped groove 3 are 53cm × 53cm, the inner net width of the cross-shaped groove 3 is 15cm, the outline dimensions of the cross-shaped limiter 4 are 40cm × 40cm, the single-limb width of the cross-shaped limiter 4 is 5cm, and the net distance between the side and end of the cross-shaped limiter 4 and the inner wall of the cross-shaped groove 3 is 5cm, that is, the horizontal displacement reserve value of the anti-falling beam device is 5cm.

[0032] Under normal use, the cross-shaped limiter 4 and the cross-shaped groove 3 maintain a sufficient distance to meet the small-range horizontal sliding of the main beam 1 caused by the temperature and the braking force of the vehicle.

[0033] Under the action of an earthquake, the main beam 1 produces a large relative horizontal displacement in the horizontal direction. When the relative displacement of the cross-shaped limiter 4 is equal to 5 cm, the cross-shaped limiter 4 fits tightly with the inner wall of the cross-shaped 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.

[0034] The utility model can realize the relative sliding between the main beam and the pier under normal use by reasonably designing the reserved value of the horizontal displacement of the anti-falling beam device. Under the action of an earthquake, it can well limit the relative sliding of the main beam to avoid the damage of the main beam caused by falling beam 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 anti-falling beam device is set in the central area of ​​the top of the pier. Due to the shielding of the pier outline and the support, the anti-falling beam device is in a hidden state, and the landscape effect under the bridge is good. The utility model has a simple structure, is practical and reliable, has low construction and maintenance costs, and has a good value for promotion and application.

Claims

1. A hidden two-way limit beam-falling prevention device for a bridge, characterized in that: The invention comprises a cross-shaped groove (3) and a cross-shaped stopper (4), wherein the cross-shaped groove (3) is arranged at the top of the pier (2), the cross-shaped stopper (4) is arranged at the bottom of the main beam (1), the cross-shaped stopper (4) is located in the cross-shaped groove (3), and a gap is reserved between the side and end of the cross-shaped stopper (4) and the cross-shaped groove (3).

2. The hidden bidirectional limit beam-falling prevention device for bridges according to claim 1 is characterized in that: A gap is reserved between the bottom of the cross-shaped stopper (4) and the cross-shaped groove (3).

3. A hidden bidirectional limit beam-falling prevention device for bridges according to claim 1 or 2, characterized in that: A plurality of first pins (6) are provided on the outside of the cross-shaped groove (3), and the cross-shaped groove (3) is pre-buried in the bridge pier (2) via the first pins (6).

4. The hidden bidirectional limit beam-falling prevention device for bridges according to claim 3 is characterized in that: The bottom of the main beam (1) is provided with an embedded steel plate (5), a plurality of second pins (8) 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 (8); the cross-shaped stopper (4) is welded to the embedded steel plate (5).

5. The hidden bidirectional limit beam-falling prevention device for bridges according to claim 4 is characterized in that: A rubber pad (7) is provided between the side of the cross-shaped limiter (4) and the cross-shaped groove (3).

6. The hidden bidirectional limit beam-falling prevention device for bridges according to claim 5 is characterized in that: The cross-shaped grooves (3) and the cross-shaped limiters (4) are provided in multiple groups.

7. The hidden bidirectional limit beam-falling prevention device for bridges according to claim 1 is characterized in that: The cross-shaped groove (3) and the cross-shaped limiter (4) are arranged at the central position of the bridge pier (2).

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