A bridge expansion device

Abstract

The present invention discloses a bridge expansion device, which includes side beams, middle beams, supporting cross beams and displacement boxes. The compression spring seats and bearing spring seats provide elastic forces for tightly holding the supporting cross beams, without degradation or disappearance, being uniform and lasting. There are no gaps or vibrations above and below the supporting cross beams, thus ensuring the long service life of the expansion device; the displacement control element adopts a tensile steel spring, with a long service life and uniform and lasting tensile force. This bridge expansion device has the characteristics of compact structure, reasonable layout, stable and reliable expansion force transmission, rigorous sealing and waterproofing, strong displacement regulation, convenient maintenance and long service life, and is particularly suitable for bridge projects with high vehicle speeds, strong impacts, heavy traffic flows and large spans.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge expansion devices, and particularly to a bridge expansion device. Background Art

[0002] The expansion device is an important accessory component in bridges, mainly used to adapt to the deformation of bridges caused by factors such as temperature changes, concrete shrinkage and creep, uneven settlement, and vehicle impact, prevent bridge deck rainwater and road residues from entering the bridge structure, and ensure that vehicles can pass smoothly. The performance and service life of the expansion device directly affect the safety of the bridge structure and the driving comfort.

[0003] With the rapid development of China's transportation industry, the safety requirements for road bridges are getting higher and higher. How to improve the safety performance and service life of the expansion device, avoid hazards such as vehicle jumping, noise, and water leakage caused by the damage of the expansion device, and improve the driving comfort are urgent problems to be solved.

[0004] The current bearing supports and pressing supports used in bridge expansion devices are combinations of rubber and steel plates. Rubber has hardening and aging phenomena during use, resulting in cracking damage, gradual loss of elasticity, and inability to provide long-term and lasting pre-tightening elastic force, forming gaps with the support crossbeam, causing jumping and abnormal noises of the expansion device when vehicles pass by, and then developing into diseases such as fracture of the middle beam and tearing of the sealing rubber strip; the displacement control elements of existing bridge expansion devices mainly use polyurethane compression springs and rubber shear springs. Polyurethane compression springs and rubber shear springs are high molecular chemical products, with problems such as large residual deformation, uneven displacement, and aging, poor durability, and need to be improved. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a bridge expansion device with a long service life, reasonable structure, stable force, and reliable displacement, so as to adapt to bridge projects with high vehicle speeds, strong impacts, large traffic flows, and large spans.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a bridge expansion device, including

[0007] Side beams, the number of the side beams is two, and the two side beams are arranged in parallel; and

[0008] Middle beam, the middle beam is located between the two side beams, and the middle beam is parallel to the side beams; and

[0009] Displacement boxes, multiple groups of the displacement boxes are arranged in pairs on the outer sides of the side beams, and the side beams are welded to the displacement boxes; and

[0010] A support crossbeam, the bottom of the middle beam is welded to the support crossbeam, and both ends of the support crossbeam extend into the displacement boxes on both sides respectively; compression spring seats and bearing spring seats are respectively arranged at the upper and lower gaps between the support crossbeam and the displacement boxes; a tensile steel spring is arranged between the side beam and the middle beam.

[0011] In one embodiment, the number of the middle beams is one or more.

[0012] In one embodiment, the number of the middle beams is more than one, and tensile steel springs are also arranged between adjacent middle beams.

[0013] In one embodiment, the compression spring seat is located between the top of the support crossbeam and the upper plate of the displacement box. The main body of the compression spring seat is a steel plate. A first groove is arranged on the lower plane of the main body of the compression spring seat, and a wear-resistant sliding plate is embedded in the first groove. The wear-resistant sliding plate is used to contact the support crossbeam; a first round blind hole is arranged at the center of the upper plane of the main body of the compression spring seat, and a first cylindrical steel spring is arranged in the first round blind hole. The inner cavity of the first cylindrical steel spring is used to accommodate the pin shaft at the upper plate of the displacement box.

[0014] In one embodiment, a gap is left between the compression spring seat and the upper plate of the displacement box.

[0015] In one embodiment, the bearing spring seat is located between the bottom of the support crossbeam and the lower plate of the displacement box. The main body of the bearing spring seat is a steel plate. A second groove is arranged on the upper plane of the main body of the bearing spring seat, and a wear-resistant sliding plate is embedded in the second groove. The wear-resistant sliding plate is used to contact the support crossbeam; a second round blind hole is arranged at the center of the lower plane of the main body of the bearing spring seat, and a second cylindrical steel spring is arranged in the second round blind hole. The inner cavity of the second cylindrical steel spring is used to accommodate the pin shaft at the lower plate of the displacement box.

[0016] In one embodiment, a gap is left between the bearing spring seat and the lower plate of the displacement box.

[0017] In one embodiment, the materials of the wear-resistant sliding plate and the wear-resistant sliding plate are both modified polytetrafluoroethylene plates or modified ultra-high molecular weight polyethylene plates or ultra-high performance polytetrafluoroethylene sliding plates.

[0018] In one embodiment, both ends of the tensile steel spring are provided with rings, and the rings are fixed to the lower parts of the side beam and the middle beam by bolts, and the tensile steel spring is always in a tensile state.

[0019] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0020] The bridge expansion device in the present invention includes side beams, middle beams, supporting cross beams and displacement boxes. The compression spring seats and bearing spring seats provide the elastic force for tightly holding the supporting cross beams, which will not degenerate or disappear, is uniform and lasting, and there are no gaps or vibrations above and below the supporting cross beam, thus ensuring the long service life of the expansion device; the displacement control element uses a tensile steel spring, which has a long service life and uniform and lasting tensile force. This bridge expansion device has the characteristics of compact structure, reasonable layout, stable and reliable expansion force transmission, strict sealing and waterproofing, strong displacement regulation, convenient maintenance and long service life, and is especially suitable for bridge projects with high vehicle speed, strong impact, large traffic flow and large span. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is the overall layout diagram of the bridge expansion device;

[0023] Figure 2 It is the side view of the bridge expansion device;

[0024] Figure 3 It is the partial top view of the bridge expansion device;

[0025] Figure 4 It is the structural schematic diagram of the compression spring seat;

[0026] Figure 5 It is the top view of the compression spring seat;

[0027] Figure 6 It is the structural schematic diagram of the bearing spring seat;

[0028] Figure 7 It is the bottom view of the bearing spring seat;

[0029] Figure 8 It is the structural schematic diagram of the displacement control of the bridge expansion device;

[0030] Wherein, 1 is the side beam; 2 is the middle beam; 3 is the displacement box; 4 is the displacement box body; 41 is the upper plate; 42 is the pin shaft; 43 is the lower plate; 5 is the supporting cross beam; 6 is the compression spring seat; 61 is the first groove; 62 is the first wear-resistant sliding plate; 63 is the first round blind hole; 64 is the first cylindrical steel spring; 7 is the bearing spring seat; 71 is the second groove; 72 is the second wear-resistant sliding plate; 73 is the second round blind hole; 74 is the second cylindrical steel spring; 8 is the tensile steel spring; 81 is the ring; 82 is the bolt; 9 is the sealing rubber strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a bridge expansion device with a long service life, reasonable structure, stable force-bearing, and reliable displacement, so as to adapt to bridge projects with high vehicle speeds, strong impacts, large traffic flows, and large spans.

[0033] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] As Figures 1 - 8 shown, the present invention provides a structural schematic diagram of a bridge expansion device. The long-life highway bridge expansion device of the present invention includes two parallel side beams 1 arranged in pairs, one or more middle beams 2 located between and parallel to the two side beams 1, and multiple pairs of displacement boxes 3 arranged outside the side beams 1; the side beams 1 are welded to the displacement box body 4, the middle beams 2 are welded to the supporting cross beam 5, and both ends of the supporting cross beam 5 extend into the two side displacement boxes 3 respectively; compression spring seats 6 and bearing spring seats 7 are respectively arranged at the upper and lower gaps between the supporting cross beam 5 and the displacement box body 4; tension steel springs 8 are arranged between the side beams 1 and between the middle beams 2 and between the middle beams 2.

[0035] Its working principle is as follows: the side beams 1 and the middle beams 2 form a vehicle traveling plane, the supporting cross beam 5 extends into the displacement box body 4 and is held tightly by the compression spring seat 6 and the bearing spring seat 7. When the gap of the bridge expansion joint changes, the supporting cross beam 5 slides in the displacement box body 4; the resilience of the tension spring 8 ensures that the gap between the side beams 1 and the middle beams 2 is consistent and adapts to rotation and displacement in all directions; a sealing rubber strip 9 is arranged between the side beams 1 and the middle beams 2 to play a role in waterproof sealing.

[0036] In one of the embodiments, the compression spring seat 6 is located between the supporting cross beam 5 and the upper plate 41 of the displacement box body 4. The main body of the compression spring seat 6 is a steel plate, and a groove 61 is arranged on its lower plane to install a wear-resistant sliding plate 62 in contact with the supporting cross beam 5. A circular blind hole 63 is arranged at the center of its upper plane, and a cylindrical steel spring 64 is arranged inside. The inner cavity of the cylindrical steel spring 64 accommodates the pin shaft 42 of the upper plate 41 of the displacement box body 4. The cylindrical steel spring 64 provides the vertical elastic force for pressing the supporting cross beam 5, and there is a movable gap between the compression spring seat 6 and the upper plate 41 of the displacement box body 4.

[0037] In one embodiment, the pressure-bearing spring seat 7 is located between the supporting cross beam 5 and the lower plate 43 of the displacement box body 4. The main body of the pressure-bearing spring seat 7 is a steel plate. A second groove 71 is provided on its upper plane to fit and install a second wear-resistant slide plate 72 in contact with the supporting cross beam 5. A second circular blind hole 73 is provided at the center of its lower plane, and a second cylindrical steel spring 74 is built therein. The pin shaft 44 of the lower plate 43 of the displacement box body 4 is accommodated in the inner cavity of the second cylindrical steel spring 74. The second cylindrical steel spring 74 provides a vertical elastic force to bear the vehicle load transmitted by the supporting cross beam 5. There is a movable gap between the pressure-bearing spring seat 7 and the lower plate 43 of the displacement box body 4.

[0038] In one embodiment, the first wear-resistant slide plate 62 and the second wear-resistant slide plate 72 are made of modified polytetrafluoroethylene plate, or modified ultra-high molecular weight polyethylene plate, or ultra-high performance polytetrafluoroethylene slide plate.

[0039] In one embodiment, both ends of the tensile steel spring 8 are provided with rings 81 and are fixed to the lower parts of the side beam 1 and the middle beam 2 by bolts 82, and are always in a tensile state to ensure uniform displacement.

[0040] Compared with the prior art, the bridge expansion device of the present invention has the following advantages: First, since the main components of the expansion device of the present invention, such as section steel, displacement box body 4, compression spring seat 6, pressure-bearing spring seat 7, supporting cross beam 5, anchor fittings and displacement control elements, are steel parts, and the wear-resistant slide plates are made of modified polytetrafluoroethylene plates, or modified ultra-high molecular weight polyethylene plates, or ultra-high performance polytetrafluoroethylene slide plates, there is no aging phenomenon, and it has excellent durability and a long service life. Second, the compression spring seat 6 and the pressure-bearing spring seat 7 are provided with elastic forces to hold the supporting cross beam by cylindrical steel springs, and there is no degradation or disappearance, which is uniform and lasting. There are no gaps and vibrations above and below the supporting cross beam 5, thereby ensuring the long life of the expansion device. Third, the displacement control element adopts the tensile steel spring 8, which has a long service life, and the tensile force is uniform and lasting. Both ends of the tensile steel spring 8 are provided with rings 81 and are fixed to the lower parts of the side beam 1 and the middle beam 2 by bolts 82, which can meet the requirements of multi-directional displacement, the connection and positioning are firm, and the installation is convenient and fast.

[0041] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0042] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A bridge expansion device, characterized in that: including side beams, the number of the side beams is two, and the two side beams are arranged in parallel; and a middle beam, the middle beam is located between the two side beams, and the middle beam is parallel to the side beams; and displacement boxes, multiple groups of the displacement boxes are arranged in pairs on the outer sides of the side beams, and the side beams are welded to the displacement boxes; and support cross beams, the bottom of the middle beam is welded to the support cross beams, and two ends of the support cross beams respectively extend into the displacement boxes on both sides; compression spring seats and bearing spring seats are respectively arranged at the upper and lower gaps between the support cross beams and the displacement boxes; a tension steel spring is arranged between the side beams and the middle beam; the compression spring seat is located between the top of the support cross beam and the upper plate of the displacement box, the main body of the compression spring seat is a steel plate, a first groove is arranged on the lower plane of the main body of the compression spring seat, and a wear-resistant sliding plate one is embedded in the first groove, and the wear-resistant sliding plate one is used for contacting the support cross beam; a first round blind hole is arranged at the center of the upper plane of the main body of the compression spring seat, a first cylindrical steel spring is arranged in the first round blind hole, and the inner cavity of the first cylindrical steel spring is used for accommodating a pin shaft at the upper plate of the displacement box; a gap is left between the compression spring seat and the upper plate of the displacement box; the bearing spring seat is located between the bottom of the support cross beam and the lower plate of the displacement box, the main body of the bearing spring seat is a steel plate, a second groove is arranged on the upper plane of the main body of the bearing spring seat, and a wear-resistant sliding plate two is embedded in the second groove, and the wear-resistant sliding plate two is used for contacting the support cross beam; a second round blind hole is arranged at the center of the lower plane of the main body of the bearing spring seat, a second cylindrical steel spring is arranged in the second round blind hole, and the inner cavity of the second cylindrical steel spring is used for accommodating a pin shaft at the lower plate of the displacement box; a gap is left between the bearing spring seat and the lower plate of the displacement box; the materials of the wear-resistant sliding plate one and the wear-resistant sliding plate two are both modified polytetrafluoroethylene plates or modified ultra-high molecular weight polyethylene plates or ultra-high performance polytetrafluoroethylene sliding plates; both ends of the tension steel spring are provided with rings, and the rings are fixed to the lower parts of the side beams and the middle beam through bolts, and the tension steel spring is always in a tension state.

2. The bridge expansion device according to claim 1, wherein: the number of the middle beams is one or more.

3. The bridge expansion device according to claim 2, wherein: when the number of the middle beams is more than one, tension steel springs are also arranged between adjacent two middle beams.

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