CN104746425B - A bridge expansion joint structure - Google Patents

Abstract

The invention discloses a bridge expansion joint structure, which is characterized in that for the expansion joints between adjacent segment beam bodies, the top plane of the expansion plate arranged in the expansion joint is lower than the height of the bridge deck to form a concave platform, and the concave platform is formed in the concave A replaceable pavement layer is set on the platform, and the top surface of the pavement layer is level with the height of the bridge deck; a support structure is set at the bottom of the expansion plate, and the support structure is to erect an arched support body between the beams on both sides of the expansion joint. The support rods are arranged on the arched support body. The expansion plate is supported by the step surface of the beams on both sides of the expansion joint, the support rods and the arch support body. The arch support body and the support rods are steel structural parts, and the pavement layer It is an elastic material layer, and the pavement layer is a structural layer with mechanical function gradient performance, and the strength of the pavement layer increases gradually along the vertical direction from the upper surface to the lower bottom surface. The invention can rapidly absorb the kinetic energy after receiving the impact load, effectively buffer the impact load, prolong the service life and improve driving comfort.

Description

A bridge expansion joint structure

The application number of this application is 2014101783047, the application date is April 29, 2014, the title of the invention is a bridge expansion joint structure, and the applicant is a divisional application of Hefei University of Technology.

technical field

The invention relates to a bridge expansion joint structure, which belongs to the technical field of bridge engineering.

Background technique

With seasonal and diurnal temperature changes, the middle girder structures of bridges such as simply supported bridges and continuous bridges experience thermal expansion and contraction. Therefore, it is necessary to set expansion joints between adjacent bridge panels to meet the expansion and rotation deformation of the bridge superstructure caused by temperature changes, concrete creep, dry shrinkage, and loads. Bridge expansion joints should have the characteristics of durability, waterproof and convenient construction, and should ensure driving comfort.

In the prior art, the expansion joints widely used in bridge engineering include plate rubber expansion joints, TST expansion joints, and Moller expansion joints. Among them, the plate rubber expansion joint has simple structure, convenient installation and strong versatility, but its rigidity is small and easy to deform, the rubber parts are easily damaged, the anchor is easily damaged, and it is easy to cause the expansion device to sink; the TST expansion joint effectively avoids or slows down the bridge head jump. Vehicle problems, but the filler is easy to bulge and sag under the long-term impact load of the vehicle, resulting in greater driving impact, aging and falling off after long-term use, cracking and water seepage, and erosion of the bridge span structure; Maurer expansion joints are currently the best. An expansion joint has a long service life, and its swallow-shaped rubber belt is easy to replace, and can meet a series of requirements such as expansion and sealing. But its expansion and contraction is too large, the rubber strip is cracked or extruded, and its section steel is prone to fracture.

Contents of the invention

The present invention provides a bridge expansion joint structure to avoid the disadvantages of the above-mentioned prior art, which can quickly absorb kinetic energy after being subjected to an impact load, effectively buffer the impact load, and greatly reduce the impact of the driving dynamic load on free expansion and contraction. The impact effect of the board prolongs the service life and improves driving comfort.

The present invention adopts following technical scheme for solving technical problems:

The bridge expansion joint structure of the present invention is characterized in that: for the expansion joints between adjacent segment beams, the top plane of the expansion plate arranged in the expansion joints is lower than the height of the bridge deck to form a concave platform. A replaceable pavement layer is set on the concave platform, and the top surface of the pavement layer is level with the height of the bridge deck; a support structure is set at the bottom of the expansion board, and the support structure is on both sides of the expansion joint An arch support body is erected between the beam bodies, and each support rod is arranged on the arch support body. The shaped support body and the support rod are steel structural parts, and the pavement layer is an elastic material layer; the pavement layer is a structural layer with mechanical function gradient performance, and the mechanical function gradient performance refers to the upper layer of the pavement layer. The surface has the same pavement performance as the pavement around the expansion joint, and the strength of the pavement gradually increases along the vertical direction from the upper surface to the lower bottom surface.

The bridge expansion joint structure of the present invention is also characterized in that:

The arch support body is connected with the adjacent segmental beam body by a movable support.

The telescopic plates are a pair of tooth plates facing each other to form fork fingers, the distance between the pair of tooth plates is variable, and the contact surface of the fork fingers between the pair of tooth plates is a circular arc surface.

Each helical spring is vertically arranged in the pavement layer, and the vertical arrangement means that the axis of the helical spring is vertical, and the helical springs are distributed in the form of a rectangular array in the plane where the pavement layer is located , the pitch of the coil spring gradually decreases from top to bottom.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The present invention combines the elastic pavement layer, the expansion board and the arched support body, which can quickly absorb the kinetic energy after receiving the impact load, effectively buffer the impact load, and greatly weaken the impact of the driving dynamic load on the free expansion board , prolong service life and improve driving comfort.

2. In the present invention, the arched support body and the beam body are connected by a hinged shaft slide plate steel support instead of a fixed connection, so that the arched support body can move freely, thereby adapting to the larger expansion and contraction deformation of the telescopic structure.

3. In the present invention, the expansion plate is set as a pair of interdigitated tooth plates, and the contact surface between the interdigitated tooth plates is an arc surface, which can effectively weaken the impact force between the tooth plates when the expansion joint shrinks.

4. The setting of the coil spring in the present invention can increase the strength of the paving layer, prolong its service life, effectively buffer the impact load, and weaken the damage to the underlying structure caused by the impact load.

5. In the present invention, the pavement layer is set as a structural layer with mechanical function gradient performance, which can make the road performance of the surface of the pavement layer continuous with that of the normal bridge pavement, and make the vehicle smooth and difficult to jump during driving. phenomenon, and can effectively convert the dynamic load into static load, so that the impact force transmitted from top to bottom of the expansion joint is gradually weakened.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 1 a is the schematic diagram of the structure of the movable support between the arch support body and the beam body in the present invention;

Fig. 2 is the structure schematic diagram of expansion plate of the present invention;

Labels in the figure: 1 beam body, 2 support rod, 3 pavement layer, 4 coil spring, 5 telescopic plate, 6 gap, 7 arched support body, 8 foam joint filler, 9 movable support, 10 upper pendulum, 11 Hinge shaft, 12 hem, 13 stainless steel plates, 14 seat plates, 15 fork fingers.

detailed description

Referring to Fig. 1, the structural form of the bridge expansion joints in this embodiment is: for the expansion joints between adjacent segment beams 1, the top plane of the expansion plate 5 arranged in the expansion joints is lower than the height of the bridge deck to form a bottom Concave platform, a replaceable pavement layer 3 is set on the concave platform, and the top surface of the pavement layer 3 is level with the height of the bridge deck, and the reserved gap between the pavement layer 3 and the bridge deck is filled with foam 8 for filling, the foam joint filler 8 is light in weight, high in specific strength, can absorb impact load, and has good heat insulation and sealing performance; a support structure is set at the bottom of the expansion plate 5, and the support structure is between the beam body 1 on both sides of the expansion joint An arched supporting body 7 is erected between them, and each supporting rod 2 is arranged on the arched supporting body 7. The expansion plate 5 is jointly supported by the step surface of the beam body 1 on both sides of the expansion joint, the supporting rod 2 and the arched supporting body 7. The arch support body 7 and the support rod 2 are steel structural parts, the arch support body 7 is used to transmit the load received by the expansion plate to the beam body 1, and weaken the load in the vertical direction, and the pavement layer 3 is an elastic material layer , the width of the paving layer 3 is 90-95% of the expansion joint width, and it is anchored on the expansion plate 5 with aluminum alloy corrosion-resistant screws.

In specific implementation, the corresponding structural settings also include:

As shown in FIG. 1 , the arch support body 7 in this embodiment is connected with the beam bodies 1 on both sides of the expansion joint by a movable support 9 . The movable support 9 is a hinged slide steel support commonly used on long-span steel beams and span simply supported beams. As shown in Figure 1a, the movable support 9 includes an upper pendulum 10, a lower hem 12, a hinge shaft 11, and a stainless steel plate 13 And the seat plate 14, wherein the upper pendulum 10 is fixedly arranged on the bottom end of the arch support body 7, the seat plate 14 is fixedly connected with the beam body 1, the stainless steel plate 13 is fixed on the seat plate 14, the upper pendulum 10 and the lower pendulum 12 are connected with the hinge shaft 11 Be arc surface contact between, bottom plane of hem 12 is attached with one deck polytetrafluoroethylene plate and stainless steel plate 13 to form friction pair. The force transmission path of the movable support 9 is: from the upper pendulum through the hinge shaft, the lower hem, the stainless steel plate, the seat plate until the beam body, the force transmission path is clear, the force transmission is good, and the rotation of the bottom pendulum 12 relative to the hinge shaft to meet the angular displacement. Therefore, when the temperature change causes the beam joint to expand and contract, the movement of the arch support body can effectively avoid damage to the expansion and contraction structure.

As shown in Figure 2, the telescopic plate 5 is a pair of tooth plates facing each other and formed as fork fingers 15. The distance between a pair of tooth plates is variable, and a gap 6 is formed therebetween. The fork fingers between a pair of tooth plates The contact surface of the contact surface is a circular arc surface, which effectively weakens the impact force between the tooth plates when the expansion joint shrinks, and avoids damage to the expansion plate 5 due to impact.

In order to increase the strength, as shown in Figure 1, each helical spring 4 is vertically arranged in the pavement layer 3, and being vertically arranged means that the axis of the helical spring 4 is vertical, and each helical spring 4 is placed in the pavement layer 3. Distributed in the form of a rectangular array in the plane of the helical spring 4, the pitch of the coil spring 4 gradually decreases from top to bottom to buffer the impact load and reduce the damage to the underlying structure caused by the impact load.

The pavement layer 3 may be an epoxy resin material layer.

The pavement layer 3 can also be an epoxy resin-based material layer, with epoxy resin as the matrix material, ceramic particles and glass fibers as reinforcement materials, and the mass ratio of epoxy resin, ceramic particles and glass fibers is 1:3 :6, the particle size of ceramic particles is 7μm~35μm, and the diameter of glass fiber is 1.5mm~2.5mm.

In this embodiment, it is also given that the pavement layer 3 is a structural layer with a mechanically functional gradient performance. Having a mechanically functionally gradient performance means that the upper surface of the pavement layer 3 has a road surface performance consistent with the road surface around the expansion joint. The strength of layer 3 gradually increases along the vertical direction from the upper surface to the lower bottom surface. The specific implementation is to use epoxy resin as the matrix material, ceramic particles and glass fiber as the reinforcing material, and produce it by centrifugal casting method. Ceramic particles have high hardness, high elastic modulus and wear resistance; glass fibers have functions such as corrosion resistance, high temperature resistance and shock absorption. The surface layer of the pavement achieves continuity with the mechanical properties of the bridge deck, the middle layer achieves better absorption of impact kinetic energy, and the strength of the bottom layer is increased to improve the anti-destructive performance of the pavement structure. The structure with mechanical function gradient performance Layer, that is, the pavement layer 3 is set as follows: epoxy resin is used as the matrix material, and the epoxy resin has small shrinkage and high adhesion in the liquid state; ceramic particles and glass fibers are used as reinforcing materials, and the particle size of the ceramic ceramic particles is The diameter of the glass fiber is 7 μm to 35 μm, and the diameter of the glass fiber is 1.5mm to 2.5mm; the pavement layer 3 is distributed in three layers from the surface to the bottom, which are the upper layer, the middle layer and the lower layer; the mass ratio of epoxy resin, ceramic particles and glass fiber In the upper layer it is 2:6:12, in the middle layer it is 2:6:15, and in the lower layer it is 2:6:18.

The reinforcing material is made into a block with a binder in advance, and then the matrix solution is cast and infiltrated into the reinforcing material under the action of centrifugal force, and then solidified to complete the preparation.

Claims (4)

1. a bridge expansion joint structure, it is characterized in that: for the shrinkage joint be between adjacent segment beam body (1), the top planes being arranged on the expansion plate (5) in described shrinkage joint forms recessed platform lower than bridge floor height, described recessed platform arranges removable pave-load layer (3), and makes the end face of described pave-load layer (3) concordant with bridge floor height, in the bottom of described expansion plate (5), braced structures is set, described braced structures sets up arch support body (7) between shrinkage joint two curb girder body (1), described arch support body (7) arranges each support bar (2), described expansion plate (5) is by the step surface at shrinkage joint two curb girder body (1), support bar (2) and arch support body (7) common support, described arch support body (7) and support bar (2) are steel construction piece, described pave-load layer (3) is elastomeric layer, described pave-load layer (3) is the deck with mechanics function gradient performance, described have mechanics function gradient performance and refer to that the upper surface of pave-load layer (3) has the Pavement Performance consistent with the road surface around shrinkage joint, and described pave-load layer (3) is on vertically direction, strengthen gradually to bottom surface intensity from upper surface.

2. bridge expansion joint structure according to claim 1, is characterized in that: described arch support body (7) be connected by freely movable bearing (9) between adjacent segment beam body (1).

3. bridge expansion joint structure according to claim 1, it is characterized in that: described expansion plate (5) is arrange the tooth plate being formed as interdigital (15) in opposite directions a pair, spacing between a pair tooth plate is variable, and the interdigital contact surface between described a pair tooth plate is arc surface.

4. bridge expansion joint structure according to claim 1, it is characterized in that: in vertically arranging each helical spring in described pave-load layer (3), described is that vertical setting refers to that helical spring axis is in vertical, the formal distribution of rectangular array pressed by described each helical spring in the plane at pave-load layer (3) place, and the pitch of described helical spring (4) reduces from top to bottom gradually.