A hidden comb-tooth expansion joint device

Abstract

The present invention belongs to the technical field of expansion joints, specifically a concealed comb-tooth expansion joint device. It comprises an expansion joint body composed of a fixed comb-tooth plate and a movable comb-tooth plate. Axis boxes are provided at each end of the expansion joint body, connecting a waterstop strip between the two boxes. The two sides of the waterstop strip are wound around a rotating shaft within the shaft box. The rotating shaft rotates, aligning the retraction and extension of the waterstop strip with the movement of the expansion joint. This novel expansion joint device effectively conceals the comb-tooth expansion and contraction area, mitigates bridge deck load impact, and protects the bridge connection structure, achieving the goals of a comb-tooth bridge expansion joint device, ensuring a secure connection and flexible expansion and contraction.

Description

Technical Field

[0001] The present invention belongs to the technical field of expansion joints, and in particular relates to a hidden comb-tooth type expansion joint device. Background Art

[0002] To accommodate bridge deck deformation, expansion joints are typically installed between beam ends, between beam ends and abutments, or at hinged bridge joints. These joints are designed to be flexible and reliably secure in both directions, parallel and perpendicular to the bridge axis. Comb-shaped plate expansion joints are a common design. Existing comb-shaped plate expansion joints consist of fixed and movable tooth plates connected by a socket-and-spigot joint.

[0003] The common problem of the comb-tooth type expansion joint device is that the comb-tooth part is prone to deformation when the movable tooth plate reciprocates and expands and contracts, that is, the end of the movable tooth plate is inserted in the tooth gap of the fixed tooth plate, and the part of the movable tooth plate is in a suspended state, so the movable tooth plate is prone to bending and deforming downward. After deformation, the fit between the movable tooth plate and the fixed tooth plate deviates, resulting in fit failure. The lifted movable tooth plate will cause damage to the tires of the passing vehicles, resulting in bumps and noise problems; secondly, the comb-tooth structure covers the expansion joint area and directly receives the impact of the vehicle bridge deck load, causing fatigue damage to the bridge concrete below it, thereby damaging the expansion joint structure, and easily causing the connecting bolts to loosen, posing a safety hazard; thirdly, in order to prevent rainwater and garbage soil from seeping into and blocking the expansion joint, a water stop is generally installed under the comb-tooth plate. However, the upper part of the comb-tooth plate is in an exposed position, and rainwater, soil, etc. can still invade the comb-tooth socket part, seriously affecting the expansion and contraction performance. At the same time, the comb-tooth plate is severely corroded, and its service life is significantly shortened. Summary of the Invention

[0004] The purpose of the present invention is to provide an expansion joint device that can effectively hide the comb teeth expansion area, alleviate the impact of bridge deck load and protect the bridge connection structure, and has the characteristics of firm connection and free expansion and contraction.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A hidden comb-tooth type expansion joint device includes an expansion joint body composed of a fixed comb plate and a movable comb plate, and is characterized in that: shaft boxes are respectively provided at both ends of the expansion joint body, and a waterstop is connected between the shaft boxes. Both sides of the waterstop are wound on a rotating shaft in the shaft box, and the rotating shaft rotates to achieve the retraction and extension of the waterstop in accordance with the movement of the expansion joint.

[0007] Additional technical features constituting the above-mentioned hidden comb-tooth expansion joint device also include:

[0008] A retractor is provided on the rotating shaft, and the retractor comprises a plurality of coil springs sleeved on the rotating shaft, one end of the coil spring is fixed to the rotating shaft, and the other end thereof is fixed in the shaft box;

[0009] The retractor has a damping mechanism comprising a concentric shaft that moves synchronously with the rotating shaft, a closed annular cavity between the rotating shaft and the concentric shaft for filling with hydraulic oil or a non-Newtonian fluid, radial blades disposed on the concentric shaft for dividing the annular cavity into two chambers, and a flow channel connecting the two chambers is provided on the blades;

[0010] The waterstop comprises a rubber matrix and a reinforcement layer composed of fiber filaments or steel wires arranged inside the rubber matrix;

[0011] The shaft box is fixed to the outer ends of the fixed comb plate and the movable comb plate respectively. The upper inner side of the shaft box has a notch for the telescopic movement of the water stop. The water stop covers the fixed comb plate and the movable comb plate and is flush with the upper surface of the shaft box.

[0012] ——The bottom of the fixed comb plate and the movable comb plate are connected to the expansion joint of the bridge through an anchoring assembly.

[0013] The hidden comb-tooth type expansion joint device provided by the present invention has the following advantages compared with the prior art: since the hidden comb-tooth type expansion joint device is provided with shaft boxes at both ends of its expansion joint body, the shaft boxes are connected with waterstops, and both sides of the waterstops are wound on the rotating shaft in the shaft box, that is, the waterstops can be retracted and its width can be freely changed. When the rotating shaft rotates, the width of the waterstop is consistent with the movement of the expansion joint. During the operation of the expansion joint device, the waterstop always hides and covers the comb plate, thereby increasing the protection of the comb plate, especially the comb tooth socket area is cleaner, avoiding rainwater and debris from intruding and silting, and ensuring that the comb teeth can be expanded and contracted freely; secondly, since the waterstop includes a rubber matrix and a fiber reinforced plastic arranged inside it, The reinforcement layer composed of fiber or steel wire improves the structural strength of the waterstop, facilitates winding and retracting, and can provide effective buffering for the impact of bridge deck load, prevents the rigid impact of the comb plate from damaging the concrete structure of the bridge, and significantly reduces the fatigue damage of the expansion joint to the bridge during operation; thirdly, because the retractor of the rotating shaft has a damping mechanism, it has a stabilizing effect on the retraction and extension of the waterstop. For example, when the vehicle accelerates or brakes, the waterstop provides strong friction to prevent the vehicle from slipping or brake failure, thereby improving the safety of vehicle passage. In addition, it also has a damping effect on the extension and retraction of the comb teeth to prevent excessive extension and retraction, and the suspended part of the movable comb plate is too large, causing collapse and deformation, thereby avoiding problems such as jumping or noise when the vehicle passes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a structural schematic diagram of a hidden comb-tooth type expansion joint device of the present invention;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the rotating shaft of the hidden comb-tooth type expansion joint device. DETAILED DESCRIPTION

[0016] The structure and working principle of a hidden comb-tooth type expansion joint device provided by the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] See also Figure 1 、 Figure 2 , is a schematic diagram of the structure of a concealed comb-tooth expansion joint device provided by the present invention. The concealed comb-tooth expansion joint device includes an expansion joint body composed of a fixed comb plate 1 and a movable comb plate 2. Axis boxes 3 are respectively provided at both ends of the expansion joint body. A waterstop 4 is connected between the axis boxes 3. Both sides of the waterstop 4 are wound around a rotating shaft 31 within the axis boxes 3. The rotating shaft 31 rotates to achieve the retraction and extension of the waterstop 4 in accordance with the movement of the expansion joint.

[0018] Its working principle is: after the fixed comb plate 1 and the movable comb plate 2 of the expansion joint device are installed in place on both sides of the expansion joint a, the shaft boxes 3 are fixed at both ends respectively, that is, the embedded grooves on both sides of the bridge expansion joint a are reserved for the fixed space of the shaft box 3, and a rotating shaft 31 is set in the shaft box 3, which can wind and retract the side of the waterstop 4, that is, the shaft boxes 3 at both ends are connected by a waterstop 4 with variable width, which hides and covers all the comb plates. When the rotating shaft 31 rotates, the width of the waterstop 4 changes in accordance with the telescopic movement of the comb teeth, thereby increasing the protection of the comb plates and improving the waterproof ability of the expansion joint device.

[0019] In the structure constituting the above-mentioned hidden comb-tooth type expansion joint device,

[0020] ——Preferably, a reel is provided on the above-mentioned rotating shaft 31, and the reel includes a plurality of coil springs 32 sleeved on the rotating shaft 31, one end b1 of the coil spring 32 is fixed to the rotating shaft 31, and the other end b2 thereof is fixed in the shaft box 3. Generally, since the waterstop 4 has a certain thickness and its toughness and strength are relatively high, when the expansion joint contracts, it can push the rotating shaft 31 to move, realize non-redundant winding, and automatically retract into the shaft box 3. After the above-mentioned reel is provided on the rotating shaft 31, when the expansion joint a is expanded, the rotating shaft 31 moves to realize the unwinding of the waterstop 4, and the coil spring 32 is in a tense state. When the expansion joint a retracts, the coil spring 32 automatically pulls the rotating shaft 31 to rotate, realizes the winding of the waterstop 4, and prevents the waterstop 4 from being unrecovered in time and accumulating during long-term use or when the expansion joint a is quickly opened and closed;

[0021] ——Furthermore, the retractor has a damping mechanism, which includes a concentric shaft 33 that moves synchronously with the rotating shaft 31. There is a closed annular cavity between the rotating shaft 31 and the concentric shaft 33, which is used to fill hydraulic oil C or non-Newtonian fluid. Radial blades 34 are provided on the concentric shaft 33 to separate the annular cavity into two chambers. The blades 34 are provided with microporous flow channels 35 connecting the two chambers. That is, when the rotating shaft 31 rotates, the concentric shaft 33 inside it rotates synchronously, and the blades 34 located radially of the concentric shaft 33 rotate synchronously. The hydraulic oil C or non-Newtonian fluid filling the annular cavity between the rotating shaft 31 and the concentric shaft 33 is stirred, thereby generating a damping effect. Since the microporous flow channel 35 is provided on the fan blade 34, connecting the chambers on both sides of the fan blade 34, it does not hinder the final movement of the rotating shaft 31, but only serves to slow down the movement amplitude and prevent violent movement. It has a good buffering effect on the impact of the bridge deck load, prevents fatigue damage to the bridge structure, loose concrete at the installation site, loose connection bolts and other problems, and significantly extends the service life of the bridge expansion joint;

[0022] Optionally, the waterstop 4 comprises a rubber matrix and an internal reinforcement layer of fiber or steel wire. This means the waterstop 4 combines strength and flexibility and is made of a rubber composite material. Specifically, this composite material comprises a rubber matrix and a reinforced rubber layer made of cord (polyester, nylon, rayon, steel wire, etc.). In addition to the characteristics of conventional composite materials, it also exhibits viscoelasticity, large deformation, and a high modulus ratio (up to 3 to 4 orders of magnitude).

[0023] In one embodiment, the shaft boxes 3 are respectively fixed to the outer ends of the fixed comb plates 1 and the movable comb plates 2, that is, the water stop 4 between the shaft boxes 3 can completely cover the fixed comb plates 1 and the movable comb plates 2. The upper inner portion of the shaft boxes 3 has a notch 36 for the telescopic movement of the water stop 4. The water stop 4 covers the fixed comb plates 1 and the movable comb plates 2 and is flush with the upper surface of the shaft boxes 3, thereby improving the flatness of the expansion joint area of ​​the bridge. There is no jumping or noise when vehicles pass by, and a seamless connection is achieved. At the same time, compared with the arrangement of the water stop 4 under the comb plates, its waterproof performance is better.

[0024] ——Furthermore, the bottom of the above-mentioned fixed comb plate 1 and movable comb plate 2 are connected to the expansion joint of the bridge through an anchoring assembly. The anchoring assembly includes a locking bolt 51 or steel bars, a gate-shaped steel bar 52 embedded in the concrete structure, a longitudinal steel bar 53, etc. The composite three-dimensional connection structure increases the stability of the expansion joint structure. Of course, the above-mentioned anchoring assembly can also be set at the bottom of the shaft box 3 to enhance the connection strength. This structure facilitates technical improvements to the existing comb-tooth type expansion joint device. It is only necessary to add the shaft box 3 on both sides of the existing expansion joint structure. It is very simple to produce, install and use, has outstanding economic benefits, and is of great promotion value.

Claims

1. A concealed comb-tooth type expansion joint device, comprising an expansion joint body consisting of a fixed comb plate and a movable comb plate, characterized in that: Axle boxes are respectively provided at both ends of the expansion joint body, and a waterstop is connected between the axle boxes. Both sides of the waterstop are wound on the rotating shaft in the axle box. The rotating shaft rotates to realize the retraction and extension of the waterstop in accordance with the movement of the expansion joint; A retractor is provided on the rotating shaft, and the retractor comprises a plurality of coil springs sleeved on the rotating shaft, one end of the coil spring is fixed to the rotating shaft, and the other end thereof is fixed in the shaft box; The upper inner portion of the shaft box is provided with a notch for the water stop to extend and retract; the water stop is flush with the upper surface of the shaft box; The retractor has a damping mechanism, which includes a concentric shaft that moves synchronously with the rotating shaft, and a closed annular cavity between the rotating shaft and the concentric shaft for filling with hydraulic oil or non-Newtonian fluid; radial blades are provided on the concentric shaft for dividing the annular cavity into two chambers, and the blades are provided with a flow channel connecting the two chambers; The waterstop comprises a rubber matrix and a reinforcement layer composed of fiber filaments or steel wires arranged inside the rubber matrix.

2. A concealed comb-tooth expansion joint device according to claim 1, characterized in that: The shaft box is fixed to the outer ends of the fixed comb plate and the movable comb plate respectively, and the water stop covers the fixed comb plate and the movable comb plate.

3. The hidden comb-tooth expansion joint device according to claim 1, characterized in that: The bottoms of the fixed comb plates and the movable comb plates are connected to the expansion joints of the bridge via anchoring components.

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