CN2709511Y - Super Large Displacement Bridge Expansion Device - Google Patents

Abstract

The utility model relates to an ultra-large displacement bridge expansion device, which comprises two edge beam steels (1) anchored at two sides of a bridge plate joint, a plurality of middle beam steels (2) arranged between the two edge beam steels, waterproof sealing rubber strips (3) are arranged between the edge beam steels and the middle beam steels and between the edge beam steels and the middle beam steels, a plurality of supporting crossbeams (5) are arranged below the edge beam steels and the middle beam steels, all the middle beam steels (2) are respectively connected with the same supporting crossbeam (5) through a bracket (8) connected with the middle beam steels, two ends of a compression bearing (20) and a sliding bearing (21) between the bracket (8) and the supporting crossbeams (5) are connected with a supporting box (4) through a compression bearing (6) and a sliding bearing (7), the supporting box (4) is anchored at two sides of the bridge plate joint, compression springs (9) in the same direction with the supporting crossbeam (5) are arranged between the bracket (8) and the supporting box (4) and between the brackets, and transverse shear springs (13) are arranged between the middle beam steel (2) and the side beam steel (1) and between the middle beam steels.

Description

Super Large Displacement Bridge Expansion Device

Technical field:

The utility model relates to a bridge telescopic device with super large displacement, which is suitable for bridges with a displacement of more than 480mm.

Background technique:

Existing large-displacement bridge telescopic devices generally have two structural forms, one is a multi-support type, and the other is a single-support type. The multi-support type must use multiple supporting beams, and each supporting beam is fixed with the same middle beam steel. If there are 5 middle beam steels, there are 5 supporting beams. In fact, after more than 5 supporting beams, the manufacturing and installation hard to accomplish. Therefore, the multi-support type bridge expansion device can only be used when the displacement does not exceed 480mm. In the single-support type bridge expansion device, all the middle girder steels are supported on the same support beam, and can perform telescopic movement back and forth along the direction of the support beam. The support beam is fixed in the box at both ends of the support box, but it is allowed to slide laterally along the bridge.

Most of the gap width uniform distribution mechanisms of large-displacement bridge expansion devices use rubber springs, which are divided into compression type and shear type.

When the compression type uniform distribution mechanism is used, the deformation of the compression spring is the smallest at the maximum or minimum slit width, where the uniform distribution ability of the uniform distribution mechanism is the smallest. At this time, uneven slit width may occur.

When the shear type uniform distribution mechanism is used, the non-deformation position of the shear spring is set at 1/2 of the specified displacement of the slit width, so the uniform distribution force of the uniform distribution mechanism here is zero, which is not conducive to the uniform distribution of the slit width.

For large-displacement telescopic devices driven solely by compression springs or shear springs, especially when there are more than 9 center beam steels, the slit width is uneven at 1/2 of the specified displacement at the maximum or minimum slit width Sex is more prominent.

The compression spring or shear spring of the existing large-displacement telescopic device is not easy to replace, especially it is more difficult to replace the elastic element adjacent to the side beam steel, which brings great inconvenience to the maintenance of the telescopic device.

Utility model content:

The purpose of the utility model is to provide a super-large-displacement bridge telescopic device that can adapt to a bridge displacement of more than 800mm, is convenient for installation and maintenance, and has low manufacturing cost.

The purpose of this utility model is achieved in that:

The utility model super-large-displacement bridge telescopic device includes two side beam steels 1 anchored on both sides of the bridge plate joint, a plurality of middle beam steels 2 arranged between the two side beam steels, and between the side beam steel and the middle beam steel. There are waterproof sealing strips 3 between the center beam steels, and there are several support beams 5 under the side beam steel and the center beam steel. There are compression supports 20 and sliding supports 21 between the frame 8 and the support beam 5. The two ends of the support beam 5 are connected to the support box 4 through the compression support 6 and the sliding support 7, and the support box 4 is anchored on both sides of the joint of the bridge deck. There is a compression spring 9 in the same direction as the support beam 5 between the bracket 8 and the support box 4 and between the brackets, and there is a transverse shear spring 13 between the center beam steel 2 and the side beam steel 1 and between the center beam steel.

Bracket 8 is a frame frame, and the compression support 20 is fixed below its upper plate, and the sliding support is fixed on its lower plate. There are fixed connecting plates 23 on its two side plates, two movable connecting plates 24 and compression springs 9 two ends. Connection, the bolts 22 connect the two movable connecting plates 24 to the fixed connecting plates of the two brackets respectively, and a movable connecting plate 24 of the compression spring between the bracket and the side beam steel passes through the bolt 22 and a fixed connecting plate 23 of the bracket Connect, another movable connecting plate 16 is connected on the fixed connecting plate 18 that is connected with the side wall of supporting box 4 by bolt 17.

The upper end of the shear spring 13 adjacent to the side beam steel is connected with the lower side of the middle beam steel 2, and the lower end is connected with the connecting plate 11, and the connecting plate 11 is connected with the fixing piece 10 connected with the side beam steel 1 and anchored in the concrete, T The middle column of the molded frame 12 is connected with the bottom of a middle beam steel, the two ends of the bottom plate of the T-shaped frame are respectively connected with the lower end surface of a shear spring 13, and the upper end surface of the shear spring 13 is connected with the bottom of a middle beam steel.

The utility model combines the control principle of the compression spring and the control principle of the shear spring, and installs the compression type and the shear type displacement uniform distribution mechanism on the single-support bridge expansion device at the same time, and installs the compression spring and the shear spring at the same time. The characteristics of the two springs effectively realize the uniformity control of the displacement.

The compression spring and shear spring of the utility model are easy to replace and convenient to maintain.

The shear springs and compression springs used in this device are made of special elastic materials. It is required that the properties of the material are uniform and have good anti-aging properties.

Description of drawings:

Figure 1 is a schematic diagram of the overall structure of the super large displacement bridge expansion device.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Fig. 3 is a B-B sectional view of Fig. 1 .

Fig. 4 is a C-C sectional view of Fig. 1 .

Fig. 5 is a D-D sectional view of Fig. 2 .

FIG. 6 is a sectional view along line E-E of FIG. 2 .

Detailed ways:

The super-large displacement bridge telescopic device is shown in Figure 1, and consists of side beam steel 1, center beam steel 2, waterproof sealing strip 3, support box 4, support beam 5, large baffle 15 and anchor assembly 14. The side girder steel 1 is welded on the support box 4 and fixed on the concrete layer of the bridge deck or on the adjacent abutment. A supporting box is set every 15mm on the whole telescopic device. The entire telescoping device is anchored in concrete.

The support method of the center beam steel and the structure of the compression uniform distribution mechanism are shown in Figure 2. The center beam steel 2 is supported on the same support beam 5 through the bracket 8, and the support beam 5 is fixed on the support beam through the compression support 6 and the sliding support 7. In the case 4, the bracket 8 is connected with the middle beam steel 2 with bolts, and the bracket 8 is slidably connected with the support beam through the middle beam compression support 20 and the middle beam sliding support 21.

The compression springs 9 are respectively installed between two adjacent brackets, and the compression springs between the center beam steel are installed on both sides of the bracket 8 below the center beam steel, and the movable connecting plate 24 installed on the compression springs 9 is connected by bolts 22 Be connected to the fixed connecting plate 23 with the notch that is connected with the side wall of the bracket 8.

On the outside of the expansion joint of the entire bridge, the bracket of the middle beam close to the side beam is also installed with a compression spring on the side of the side beam, and one end of the compression spring adjacent to the side beam steel is fixed to the bracket below the middle beam steel adjacent to the side beam steel The other end is fixed in the fixed box 19 on the side of the support box 4, and the movable connecting plate 16 installed on the compression spring 9 is connected to the fixed box 19 with a notch connected with the side wall of the support box 4 with bolts 17. Connecting plate 18.

When the bridge deck expands and contracts, the width of the seam changes, and the elastic force of the compression spring can push the center girder steel to slide along the supporting beam through the bracket, so that the width of each seam changes evenly. The compression spring is pre-loaded, and the spring compression is the smallest when the slit width is the largest, and vice versa, but there is no elastic zero point.

The structure of the shear uniform distribution mechanism is shown in Figure 3. The shear spring 13 is installed under the side beam steel 1 and the middle beam steel 2, and is fixedly connected with one of the middle beam steels through the T-shaped frame 12. The two T-shaped frames 12 Shear springs are respectively installed on the sides, and each is fixed with the adjacent center beam steel 2. The shear spring at the outermost side of the telescopic device, that is, the shear spring adjacent to the side beam steel, is fixed at one end to the adjacent side beam steel. Below the middle beam steel, the other end is connected with the side beam steel, and the connecting plate 11 is connected to the fixed connector 10 connected with the side beam steel and anchored in the concrete with bolts.

When the bridge deck expands and contracts, the side girders and displacement boxes are driven to move, and the width of the seam changes. The elastic force of the shear spring pushes the center beam steel to move through the T-shaped frame, so that each seam changes evenly. According to the characteristics of the shear spring, the non-deformation position of the spring is set at 1/2 of the rated displacement between the steel beams, where the shear deformation of the shear spring is zero.

The dual drive mechanism of compression spring and shear spring is adopted, and the characteristic of no zero point in compression is used to overcome the disadvantage that the shear force is zero when the shear spring is in the middle position. At the same time, the shearing force is the largest when the shear spring is at the maximum slit width, which overcomes the characteristic that the elastic force is small when the compression spring is at the maximum slit width, so that the advantages of the two springs are effectively used to effectively control the uniformity of the slit width. And each type of spring can independently drive the expansion joint to change evenly, which can play a double protective role. A spring failure has little effect on the seam width and provides sufficient replacement and maintenance time.

The side beam steel, center beam steel, supporting frame, displacement box, large baffle plate, anchoring component and supporting beam should meet the requirements of 6.1.2 in JT/T327, the transportation industry standard of the People's Republic of China.

The waterproof sealing strip should meet the requirements of 6.1.1 and 6.2.1.1c in JT/T327, the transportation industry standard of the People's Republic of China.

The elastic elements such as the compression support, sliding support, middle sill compression support, middle sill sliding support, compression spring and shear spring should meet the requirements of 6.1.1 in JT/327, the transportation industry standard of the People's Republic of China.

The shear springs and compression springs are made of special elastic materials, which require uniform properties and good aging resistance.

The telescopic device of the utility model is also made of a compression type, which requires uniform material performance and good anti-aging performance.

The telescopic device of the utility model adopts the principle of compression type displacement control and the principle of shear type displacement control at the same time, reasonably installs the installation position and method of the compression spring and the shear spring, and eliminates the It eliminates the phenomenon that the 0 displacement or maximum displacement and 1/2 of the rated displacement of the traditional structure of the large displacement telescopic device have a small or equal slit width uniform force, ensuring that there is sufficient elastic force to ensure the slit width under different displacements. Evenly distributed, and has a double protection function.

Claims (3)

1, super large displacement bridge extension joint, comprise the two side bar steel (i) that are anchored at bridge plate seam crossing both sides, be located at the many middle joist steels (2) between these two side bar steel, the side bar steel is with between the middle joist steel and between the middle joist steel waterproof sealing adhesive tape (3) being arranged, some bearing cross beams (5) are arranged below side bar steel and the middle joist steel, all middle joist steels (2) respectively are connected with same bearing cross beam (5) supporting by a connected carriage (8), there are two ends of supporting of compressing (20) and sliding bearing (21) bearing cross beam (5) to be connected with supported box (4) with sliding bearing (7) between carriage (8) and the bearing cross beam (5) by compressing supporting (6), supported box (4) is anchored in the concrete of bridge plate seam crossing both sides, it is characterized in that between carriage (8) and the supported box (4) and carriage between have and bearing cross beam (5) compression spring (9) in the same way, between middle joist steel (2) and the side bar steel (1) and between the middle joist steel lateral shear spring (13) is arranged.

2, bridge extension joint according to claim 1, tool is characterised in that carriage (8) is a frame, compress below supporting (20) plate fixed thereon, sliding bearing (21) is fixed on it above lower plate, fixed connecting plate (23) is arranged on its biside plate, two active plates (24) are connected with compression spring (9) two ends, bolt (22) is connected to two active plates (24) on the fixed connecting plate of two carriages, an active plate (24) of the compression spring between carriage and the side bar steel is connected with a fixed connecting plate (23) of carriage by bolt (22), and another active plate (16) is connected on the fixed connecting plate (18) that is connected with the sidewall of supported box (4) by bolt (17).

3, bridge extension joint according to claim 1, it is characterized in that with the following connection of the upper end of the adjacent shear spring of side bar steel (13) with middle joist steel (2), the lower end is connected with junction plate (11), junction plate (11) connects with the fixture (10) that is connected with side bar steel (1) and be anchored in the concrete, the following of joist steel is connected in the center pillar and of T type frame (12), each is connected T type frame base plate two ends with the lower surface of a shear spring (13), and the following of joist steel is connected in the upper surface and of shear spring (13).

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