Comb tooth type bidirectional limiting anti-beam-falling device for bridge

Abstract

The utility model discloses a comb tooth type 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 realized in the transverse bridge direction and the longitudinal bridge direction at the same time. The device comprises a tooth groove and a comb-tooth-shaped limiting stopper, the comb-tooth-shaped limiting stopper is arranged on the side face of a main beam, the tooth groove is formed in the end of a cover beam, the comb-tooth-shaped limiting stopper is installed in the tooth groove in a matched mode, a gap in the forward bridge direction and a gap in the transverse bridge direction are reserved, the gap in the transverse bridge direction is reserved between the tooth groove and the main beam, and a bidirectional horizontal displacement reserved space is formed. Under the earthquake action, longitudinal and transverse relative displacement occurs between the cover beam and the main beam, when the horizontal relative displacement reaches a reserved value in the bridge direction, the comb-tooth-shaped limiting device is tightly attached to the inner side wall of the tooth groove, when the horizontal relative displacement reaches a reserved value in the transverse bridge direction, the tooth groove is tightly attached to the side face of the main beam, and relative sliding of the main beam is limited; and the girder falling damage caused by excessive displacement of the girder is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of bridge engineering, and particularly relates to a comb-type bidirectional limit anti-falling beam device for bridges. Background Technique

[0002] Bridge structures play a crucial role in transportation. When an earthquake occurs, preventing the devastating damage of road bridges is a prerequisite for disaster relief. Literature on the investigation of the Wenchuan earthquake disaster shows that bridges on some national and provincial trunk roads in Sichuan Province were damaged to varying degrees, especially the limit blocks. The serious damage to the limit blocks is mainly caused by the collision between the main beam and the blocks. Once the limit blocks crack and fail, the reliable connection with the capping beam will be lost. As a result, the upper main beam loses lateral restraint, and excessive horizontal displacement leads to the failure of the bearings and even the falling of the beam. The displacement of the beam body is a very common bridge earthquake damage, mainly manifested as longitudinal displacement, transverse displacement and beam body rotation in the longitudinal direction of the bridge. Most bridges in earthquake-stricken areas are beam bridges, and plate rubber bearings and pot bearings are commonly used. Under the action of an earthquake, when the frictional force between the beam body and the bearing and the shear strength of the bearing are insufficient to resist the horizontal earthquake force, relative sliding will occur between the beam body and the capping beam. When the displacement of the beam body is too large and exceeds the lap length of the pier and the beam, the main beam loses support and the beam will fall, which is an extreme form of damage to the displacement of the main beam. Although the sliding between the beam body and the bearing will cause damage to the superstructure, the sliding between the beam body and the bearing does play an earthquake isolation role.

[0003] Concrete blocks are widely used in various beam bridges and urban elevated roads. Therefore, for the seismic design of this type of bridge, the key is to adopt a reasonable block design to dissipate seismic energy and set a sufficient lap length between the pier and the beam to ensure that the displacement of the beam body is controlled within an acceptable range without significantly increasing the seismic force on the pier column. Although the block is only a construction measure in China's specifications, it plays a huge role in rare earthquakes. Optimizing the design of the horizontal limit block can effectively improve the seismic capacity of the bridge, meet the basic performance goal of not collapsing, and avoid more serious social and economic impacts caused by the loss of the traffic function of the bridge. Content of the Utility Model

[0004] The purpose of the utility model is to provide a comb-type bidirectional limit anti-falling beam device for bridges to solve the problems of how to improve the seismic performance of bridges and ensure anti-falling beam limit in both the transverse and longitudinal directions of the bridges.

[0005] The technical solution of the utility model is: a comb-type bidirectional limit anti-falling beam device for bridges, including a tooth groove and a comb-type limiter. The comb-type limiter is arranged on the side of the main beam, and the tooth groove is arranged at the end of the capping beam. The comb-type limiter is installed in the tooth groove in a matching manner and there are gaps reserved in the longitudinal direction and transverse direction of the bridge. There is a gap reserved in the transverse direction between the tooth groove and the main beam, forming a two-way horizontal displacement reserved space.

[0006] As a further improvement of the utility model, a first embedded steel plate is provided on the upper surface of the capping beam end. A plurality of first pins are provided on the first embedded steel plate. The first pins are installed in the capping beam, and the tooth groove is welded to the first embedded steel plate.

[0007] As a further improvement of the utility model, a second embedded steel plate is provided on the side surface of the main beam. A plurality of second pins are provided on the second embedded steel plate. The second pins are installed in the main beam, and the comb-shaped limiter is welded to the second embedded steel plate.

[0008] As a further improvement of the utility model, a rubber pad is provided between the side of the comb-shaped limiter and the tooth groove.

[0009] As a further improvement of the utility model, multiple groups of tooth grooves and comb-shaped limiters are provided.

[0010] The beneficial effects of the utility model are as follows: The utility model consists of a tooth groove and a comb-shaped limiter to form a falling prevention beam device, and reasonably designs the horizontal displacement reserved space of the falling prevention beam device. Under normal use conditions, it can meet the relative sliding between the main beam and the capping beam; under the action of an earthquake, longitudinal and transverse relative displacements occur between the capping beam and the main beam. When the horizontal relative displacement reaches the reserved value in the longitudinal direction of the bridge, the comb-shaped limiter is closely attached to the inner side wall of the tooth groove. When the horizontal relative displacement reaches the reserved value in the transverse direction of the bridge, the tooth groove is closely attached to the side surface of the main beam, restricting the relative sliding of the main beam and avoiding the falling beam failure of the main beam due to excessive displacement. The falling prevention beam device is arranged at the end of the capping beam, and its appearance is the same as that of a conventional reinforced concrete retaining block, with good landscape effect. The utility model has a simple structure, is practical and reliable, has low manufacturing cost and maintenance cost, and has good popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the utility model;

[0012] Figure 2 is an installation schematic diagram of the tooth groove and the comb-shaped limiter in the utility model;

[0013] Figure 3 is a schematic diagram of the plane structure of the utility model before installation;

[0014] Figure 4 is a schematic diagram of the plane structure of the utility model after installation.

[0015] In the figure: 1-main beam; 2-capping beam; 3-tooth groove; 4-comb-shaped limiter; 5-first embedded steel plate; 6-first pin; 7-rubber pad; 8-second embedded steel plate; 9-second pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the utility model in detail with reference to the accompanying drawings.

[0017] As Figures 1-4 shown, a comb-tooth type bidirectional limit anti-falling beam device for bridges includes a tooth groove 3 and a comb-tooth type limiter 4. The comb-tooth type limiter 4 is arranged on the side of the main beam 1, and the tooth groove 3 is arranged at the end of the capping beam 2. The comb-tooth type limiter 4 is fitted and installed in the tooth groove 3 with a certain clearance reserved in the longitudinal direction of the bridge and the transverse direction of the bridge. A certain clearance is reserved between the tooth groove 3 and the main beam 1 in the transverse direction of the bridge, forming a bidirectional horizontal displacement reserved space.

[0018] On the upper surface of the end of the capping beam 2, a first embedded steel plate 5 is provided. A plurality of first pins 6 are provided on the first embedded steel plate 5. The first pins 6 are installed in the capping beam 2, and the tooth groove 3 is welded to the first embedded steel plate 5.

[0019] On the side of the main beam 1, a second embedded steel plate 8 is provided. A plurality of second pins 9 are provided on the second embedded steel plate 8. The second pins 9 are installed in the main beam 1, and the comb-tooth type limiter 4 is welded to the second embedded steel plate 8.

[0020] A rubber pad 7 is provided between the side of the comb-tooth type limiter 4 and the tooth groove 3.

[0021] Multiple groups of tooth grooves 3 and comb-tooth type limiters 4 are provided.

[0022] The tooth groove 3 and the comb-tooth type limiter 4 are made of steel.

[0023] The construction method is as follows:

[0024] A. When binding the steel bars of the capping beam 2, position and embed the first embedded steel plate 5, and then pour the concrete of the capping beam 2 for curing;

[0025] B. When binding the steel bars of the main beam 1, position and embed the second embedded steel plate 8, weld the comb-tooth type limiter 4 and the second embedded steel plate 8 into a whole, and then pour the concrete of the main beam 1 for curing;

[0026] C. After hoisting the main beam 1, weld and install the tooth groove 3 on the first embedded steel plate 5;

[0027] D. Install the rubber pad 7 in the gap between the side of the comb-tooth type limiter 4 and the tooth groove 3.

[0028] Example 1,

[0029] The main beam 1 is a precast small box girder. The top width of the capping beam 2 is 180 cm, the total width of the tooth groove 3 is 175 cm, and the tooth groove 3 includes 4 inner grooves. The net width of each inner groove is 25 cm. The width of a single comb tooth of the comb-tooth type limiter 4 is 15 cm. The net distance from the side (i.e., the end) of the comb-tooth type limiter 4 to the inner wall of the tooth groove 3 is 5 cm, that is, the reserved value of the longitudinal displacement of the anti-falling beam device is 5 cm. When the tooth groove 3 is installed at the end of the capping beam 2, the distance from the side of the main beam is 5 cm, that is, the reserved value of the transverse displacement of the anti-falling beam device is also 5 cm.

[0030] Under normal use conditions, there is a sufficient distance between the comb - type stopper 4 and the tooth groove 3, which can meet the small - range horizontal sliding of the main beam 1 under the action of temperature and vehicle braking force.

[0031] Under the action of an earthquake, the main beam 1 generates a large horizontal displacement in the horizontal direction. When the longitudinal relative displacement of the comb - type stopper 4 is equal to 5 cm, the comb - type stopper 4 is in close contact with the inner side wall of the tooth groove 3, restricting the longitudinal relative sliding of the main beam 1; when the transverse relative displacement of the comb - type stopper 4 is equal to 5 cm, the tooth groove 3 is in close contact with the side surface of the main beam 1, restricting the transverse relative sliding of the main beam 1; the two - way limiting function of the anti - falling beam device can effectively prevent the main beam 1 from falling beam failure due to excessive displacement.

[0032] The utility model can realize the relative sliding between the main beam and the capping beam under normal use conditions 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 restrict the relative sliding of the main beam and avoid the falling beam failure of the main beam due to excessive displacement. The anti - falling beam device is arranged at the end of the capping beam. While keeping the appearance consistent with the conventional reinforced concrete retaining block, it solves the problems of how to improve the seismic performance of the bridge and ensure the anti - falling beam limit in both the transverse and longitudinal directions of the bridge. The structure of the utility model is simple, practical and reliable, with low cost of construction and maintenance, and has good popularization and application value.

Claims

1. A comb-tooth type bidirectional limit beam-falling prevention device for bridges, characterized in that: The invention comprises a tooth groove (3) and a comb-tooth type stopper (4), wherein the comb-tooth type stopper (4) is arranged on the side of the main beam (1), the tooth groove (3) is arranged at the end of the cap beam (2), the comb-tooth type stopper (4) is installed in the tooth groove (3) and a gap in the longitudinal direction of the bridge and a gap in the transverse direction of the bridge are reserved, and a gap in the transverse direction of the bridge is reserved between the tooth groove (3) and the main beam (1).

2. The comb-tooth type bidirectional limit beam-falling prevention device for bridges according to claim 1 is characterized in that: A first embedded steel plate (5) is provided on the upper surface of the end of the cap beam (2), a plurality of first pins (6) are provided on the first embedded steel plate (5), the first pins (6) are installed in the cap beam (2), and the tooth groove (3) is welded to the first embedded steel plate (5).

3. The comb-tooth type bidirectional limit beam-falling prevention device for bridges according to claim 1 is characterized in that: A second embedded steel plate (8) is provided on the side of the main beam (1), a plurality of second pins (9) are provided on the second embedded steel plate (8), the second pins (9) are installed in the main beam (1), and the comb-tooth-shaped limiter (4) is welded to the second embedded steel plate (8).

4. A comb-tooth type bidirectional limit beam-falling prevention device for bridges according to any one of claims 1 to 3, characterized in that: A rubber pad (7) is provided between the side of the comb-tooth-shaped limiter (4) and the tooth groove (3).

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

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