CN208072195U - Bridge expansion joint loading strutting arrangement - Google Patents

Abstract

The utility model discloses a loading support device for a bridge expansion joint, including a box girder, a base, a baffle, bolts, a pressure plate and an expansion joint specimen. The box girder is fixed to the ground, and two bases for supporting the expansion joint specimen are arranged on the top surface of the box girder, and the two bases are arranged at both ends of the top surface along the axial direction of the box girder. The top of the base is a receiving surface for receiving the expansion joint specimen, and the expansion joint specimen is arranged between the two bases and fixed by the receiving surface, the baffle, bolts and the pressure plate. The technical effect of the utility model is that by setting the top surface of the base to different inclination angles, the dynamic performance of the bridge expansion joint when it is impacted by a vehicle load is simulated. The support device has a simple structure, good use effect, low cost, and strong safety, and can be promoted and applied in expansion joint loading experiments.

Description

A loading support device for bridge expansion joints

technical field

The utility model relates to a loading support device for bridge expansion joints.

Background technique

The expansion joints of the bridge are set at the relatively weak parts of the structure such as the end of the bridge. It directly withstands the repeated impact of the vehicle load all the year round, and at the same time is exposed to the natural environment for a long time and is affected by the external environment. The lower telescoping device is more prone to damage. Replacing telescoping devices not only increases bridge maintenance costs, but also blocks traffic and affects the normal operation of the bridge structure. In addition, damage to the telescopic device will also affect the beam slab and bridge deck pavement, reducing the performance of the bridge structure and reducing driving comfort. Therefore, carrying out loading experiments on expansion joints and studying their mechanical properties under load is of great significance for optimizing the design of expansion joints, improving driving comfort, and reducing maintenance costs.

The expansion joints are set in the pavement of the bridge, and are inclined because of the longitudinal slope of the bridge. In actual engineering, they are simultaneously subjected to horizontal and vertical forces. Therefore, when conducting experiments on expansion joints, it is necessary to adopt an oblique loading method, and the fixation of expansion joints and the stability of the entire device should also be considered, which makes it more difficult to carry out such experimental research.

Contents of the invention

In order to solve the current technical problem that the adaptation of bridge expansion joints is difficult in performance testing, the utility model provides a bridge expansion joint loading support device with simple structure, good use effect, low cost and strong safety.

In order to realize above-mentioned technical purpose, technical scheme of the present invention is,

A loading and supporting device for bridge expansion joints, comprising a box girder, a base, a baffle plate, bolts, a pressure plate and an expansion joint test piece, the box girder is fixed on the ground, and the top surface of the box girder is provided with two The base of the expansion joint test piece, the two bases are arranged at both ends of the top surface along the axial direction of the box girder, the top of the base is the receiving surface for receiving the expansion joint test piece, the receiving surface of the two bases A baffle plate for restricting the movement of the expansion joint specimen along the horizontal direction of the axis of the box girder is fixed on one side close to the ends of both sides of the box girder, and two The bolts used to limit the movement of the expansion joint test piece in the horizontal direction perpendicular to the axis of the box girder, the pressure plate is set on two bolts by setting two pressure plate holes for passing through the bolts, and each bolt is set above the pressure plate The nut is used to limit the movement of the expansion joint test piece along the vertical direction perpendicular to the axis of the box girder through the pressure plate. The expansion joint test piece is arranged between the two bases and fixed by the receiving surface, the baffle plate, the bolt and the pressure plate. The load actuator applies the external force on the expansion joint specimen to simulate the bridge expansion joint being impacted by the vehicle load.

The described bridge expansion joint loading support device, the box girder is fixed on the ground through the box girder fixing device, the box girder fixing device includes an anchor rod and a nut arranged on the anchor rod, the box girder There are at least two groups of holes for the anchors to pass through on the beam, and each group of holes includes two holes respectively arranged at the same position on the upper and lower side walls of the box girder, and each anchor rod passes through a group of holes respectively, and the anchor rods The lower end of the box girder is fixed on the ground, and the upper end is screwed into a nut contacting the surface of the upper side wall of the box girder to fix the box girder.

The described bridge expansion joint loading support device, the base includes a vertical plate and a flat plate, the vertical plate is vertically fixed on the top surface of the box girder, the flat plate is fixed on the top of the vertical plate and The upper surface forms the receiving surface of the base.

In the above-mentioned bridge expansion joint loading support device, the receiving surface of the base on the top surface of the box girder is an inclined plane at a certain angle with the horizontal plane along the axial direction of the box girder, and the receiving surfaces of the two bases are in the on the same plane.

In the above described bridge expansion joint loading support device, the number of the box girder is one, and the expansion joint test piece includes a beam and a loading wedge, and the beam is fixed on the top surface of the box girder Between the upper two bases, the wedge angle of the loading wedge is the same as the inclination angle of the receiving surface, the loading wedge is fixed on the beam and the top surface of the loading wedge is horizontal, and the external load actuator is applied to the loading wedge. The block is applied to simulate the external force when the bridge expansion joint is impacted by the vehicle load.

In the above described bridge expansion joint loading support device, the number of the box girders is at least two, and the expansion joint test piece includes a beam equal to the number of the box girders, a middle beam and at least one loading wedge , each of the beams is fixed between two bases on the top surface of a box girder, the box girders are arranged parallel to each other and the two ends of each box girder are on the same straight line, and the middle beam across the gap between the beams and fixed on each beam, the wedge angle of the loading wedge is the same as the inclination angle of the receiving surface, the loading wedge is fixed on the middle beam and the top surface of the loading wedge is horizontal, The external load actuator applies the external force to the loading wedge to simulate the bridge expansion joint being impacted by the vehicle load.

The technical effect of the utility model is that by setting the top surface of the base at different inclination angles, the dynamic performance of the bridge expansion joints impacted by the vehicle load is simulated when the bridge is at different longitudinal gradients. The support device has the advantages of simple structure, good use effect, low cost and strong safety, and can be popularized and applied in expansion joint loading experiments.

Below in conjunction with accompanying drawing, the utility model is further described.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Figure 2 is an exploded schematic view of the base;

Fig. 3 is a schematic view of the utility model in use after the expansion joint is loaded;

In the figure: 1. Box girder, 2. Anchor rod, 3. Base, 4. Baffle plate, 5. Pressure plate, 6. Bolt, 7. Beam, 8. Center beam, 9. Loading wedge, 10. Ground anchor groove.

Detailed ways

Example 1

Referring to Fig. 1, the present embodiment comprises box girder, base, baffle plate, bolt, pressure plate and expansion joint test piece, and box girder is fixed on the ground, and the top surface of box girder is provided with two for supporting expansion joint test piece. Base, the two bases are arranged at both ends of the top surface along the axial direction of the box girder. One side of the part is fixed with a baffle for restricting the movement of the expansion joint test piece along the horizontal direction of the box girder axis. Bolts that move in the horizontal direction perpendicular to the axis of the box girder. The pressure plate is set on two bolts by setting two pressure plate holes for passing through the bolts. Each bolt is provided with a nut above the pressure plate to limit the expansion joint specimen along the vertical direction through the pressure plate. The vertical direction of the axis of the box girder moves, the expansion joint specimen is set between two bases and fixed by the bearing surface, baffle plate, bolt and pressure plate, and the external load actuator applies the simulated bridge expansion joint to the expansion joint specimen The external force when impacted by the vehicle load.

Wherein the box girder is fixed on the ground through the box girder fixing device, the box girder fixing device includes an anchor rod and a nut arranged on the anchor rod, and at least two groups of holes for the anchor rod to pass are opened on the box girder, each The group of holes includes two holes respectively arranged at the same position on the upper and lower side walls of the box girder. Each anchor rod passes through a group of holes respectively. Nuts to secure the box girder.

Referring to Fig. 2, the base of this embodiment includes a vertical plate and a flat plate, the vertical plate is fixed vertically on the top surface of the box girder, the flat plate is fixed on the top of the vertical plate and the upper surface forms the receiving surface of the base. Among them, the base of this embodiment is welded by four steel plates, including three vertical plates and a flat plate, and the three vertical plates are welded into an I-shaped shape. In actual use, two or more vertical plates can also be used for support. .

In order to simulate the actual bridge state, the receiving surface of the base on the top surface of the box girder is an inclined plane at a certain angle with the horizontal plane along the axis of the box girder, and the receiving surfaces of the two bases are on the same plane. The angle of inclination depends on the longitudinal slope angle of the bridge to be simulated.

The number of box girders in this embodiment is one, and the expansion joint test piece includes a beam and a loading wedge. The beam is fixed between the two bases on the top surface of the box girder. The inclination angle is the same, the loading wedge is fixed on the beam and the top surface of the loading wedge is horizontal, and the external load actuator applies an external force to the loading wedge to simulate the bridge expansion joint being impacted by the vehicle load.

Example 2

Referring to Fig. 3, the number of box girders in this embodiment is 4, and the expansion joint test piece includes beams equal to the number of box girders, a middle beam and two loading wedges, and each beam is fixed on the top of a box girder. Between the two bases on the surface, the box girders are arranged parallel to each other and the two ends of each box girder are on the same straight line. The middle beam spans the gap between the beams and is fixed on each beam. The angle is the same as the inclination angle of the bearing surface, the loading wedge is fixed on the middle beam and the top surface of the loading wedge is horizontal, and the external load actuator applies an external force to the loading wedge to simulate the bridge expansion joint being impacted by the vehicle load. In this embodiment, a loading wedge is welded at the center of the outer two spans of the test piece. During the experiment, the beams were placed on the slope of the base, and the positions of the support frame and the specimen were adjusted so that the four beams were on the slope of the base. In order to fix 4 box girders in this embodiment, the whole support frame is fixed in the ground anchor groove by anchor rods. Then the crossbeam of the expansion joint is fixed on the base through the screw rod passing through the base slope and the hole of the pressing plate. When loading, the load actuator acts on the upper surface of the loading wedge to simulate the dynamic performance of the bridge expansion joints under the impact of vehicle loads when the bridge is at different longitudinal slopes.

Claims (6)

1. a bridge expansion joint loading supporting device is characterized in that, comprises box girder, base, baffle plate, bolt, pressing plate and expansion joint test piece, and described box girder is fixed on the ground, and the top surface of box girder is provided with There are two bases for supporting the expansion joint test piece, the two bases are arranged at both ends of the top surface along the axial direction of the box girder, the top of the base is the receiving surface for receiving the expansion joint test piece, the two bases The receiving surfaces of the two bases are respectively fixed with a baffle on the side close to the ends of both sides of the box girder to limit the movement of the expansion joint specimen along the horizontal direction of the box girder axis, and the receiving surfaces of the two bases are respectively on the other side. Two bolts are fixed on one side to limit the horizontal movement of the expansion joint specimen along the axis of the vertical box girder. Nuts are set above the pressing plate to restrict the movement of the expansion joint specimen along the vertical direction perpendicular to the axis of the box girder through the pressing plate. and the pressure plate are fixed, and the external load actuator applies the external force to the expansion joint specimen to simulate the bridge expansion joint being impacted by the vehicle load. 2. The loading and supporting device for bridge expansion joints according to claim 1, wherein the box girder is fixed on the ground through a box girder fixing device, and the box girder fixing device includes anchor rods and is arranged on The nut on the anchor rod. There are at least two groups of holes for the anchor rod to pass through on the box girder. Each group of holes includes two holes that are respectively arranged at the same position on the upper and lower side walls of the box girder. Each anchor The rods pass through a group of holes respectively, the lower end of the anchor rod is fixed on the ground, and the upper end is screwed into a nut that contacts the upper side wall surface of the box girder to fix the box girder. 3. A kind of bridge expansion joint loading support device according to claim 1, characterized in that, said base comprises a riser and a flat plate, and said riser is vertically fixed on the top surface of the box girder, The flat plate is fixed on the top of the vertical plate and the upper surface forms the receiving surface of the base. 4. A bridge expansion joint loading support device according to claim 1, characterized in that, the receiving surface of the base on the top surface of the box girder is an inclined plane at a certain angle with the horizontal plane along the axial direction of the box girder , and the receiving surfaces of the two bases are on the same plane. 5. The loading support device for a bridge expansion joint according to claim 4, wherein the number of said box girders is one, and said expansion joint test piece comprises a beam and a loading wedge, and said The beam is fixed between two bases on the top surface of the box girder, the wedge angle of the loading wedge is the same as the inclination angle of the receiving surface, the loading wedge is fixed on the beam and the top surface of the loading wedge is Horizontally, the external load actuator exerts an external force on the loading wedge to simulate the bridge expansion joint being impacted by the vehicle load. 6. The loading and supporting device for bridge expansion joints according to claim 4, characterized in that, the number of said box girders is at least two, and said expansion joint test piece comprises beams equal to the number of box girders, A middle beam and at least one loading wedge, each cross beam is fixed between two bases on the top surface of a box beam, the box beams are arranged parallel to each other and the two ends of each box beam are respectively On the same straight line, the middle beam spans the gap between the beams and is fixed on each beam, the wedge angle of the loading wedge is the same as the inclination angle of the receiving surface, and the loading wedge is fixed on the middle beam And the top surface of the loading wedge is horizontal, and the external load actuator applies an external force to the loading wedge to simulate the bridge expansion joint being impacted by the vehicle load.