Long-life bridge expansion device and notch structure

Abstract

The utility model relates to a long-life bridge expansion device and a notch structure, the expansion device comprises a boundary beam and a displacement supporting box arranged on the boundary beam, and the central axis of the displacement supporting box along the bridge direction coincides with the central line of a vehicle wheel track belt in a lane. Or the deviation distance between the center line of the vehicle wheel track belt and the center line of the displacement supporting box is smaller than or equal to the width of the displacement supporting box; the notch structure comprises a bottom plate and a side plate connected with the bottom plate, the bottom plate and the side plate are arranged on the bottom wall and the side wall of the bridge notch respectively, and the bottom plate is used for installing the telescopic device; according to the telescopic device, the position of the displacement supporting box is reasonably arranged, so that a vehicle passes through the position above the displacement supporting box, the stress level and amplitude of the telescopic device are effectively reduced, and the overall service life of the telescopic device is further prolonged; the concrete structure of the expansion joint notch is protected through the side plates and the bottom plate of the steel structure, damage to a bridge structure caused by chiseling construction when the expansion device is replaced is avoided, and therefore the overall service life of the expansion joint is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of expansion joint construction, and in particular relates to a long-life bridge expansion device and a notch structure. Background Art

[0002] In the construction of bridges, the expansion device is an indispensable component. It is responsible for the free expansion and contraction of the bridge when the bridge is deformed due to factors such as temperature changes and vehicle loads, so as to maintain the integrity and safety of the bridge structure. The expansion device is mainly composed of two parts: the anchor structure and the load-bearing structure. The anchor structure is firmly connected to the main body of the bridge through anchor steel bars, anchor plates and concrete filled later; while the load-bearing structure is mainly composed of the center beam, side beams and displacement support boxes, which together bear the loads generated during the expansion and contraction of the bridge.

[0003] However, some technical difficulties are often encountered during the replacement and maintenance of the expansion device. First, when workers chisel away the concrete of the expansion joint notch connecting the old expansion device to the bridge, they are likely to accidentally damage the anchor steel bars embedded in the notch of the bridge expansion joint for fixing the expansion device, causing the steel bars to be damaged or bent. Once this happens, the damaged steel bars will hinder the installation of new anchor steel bars, and the anchor plates of the new expansion device side beams cannot be connected one by one with the newly implanted anchor steel bars in the notch, which in turn affects the stability and overall performance of the anchor structure. This unstable anchor structure will seriously affect the service life of the expansion device and even threaten the safety of the bridge.

[0004] The design life of a bridge expansion device is generally 15 years, which is much shorter than the 100-year design life of the main bridge structure. During the design life cycle of the bridge, it is inevitable to replace the expansion device many times. Repeatedly chiseling out the anchoring concrete in the expansion joint groove will cause damage to the bridge deck or abutment back wall at the groove, reducing the anchoring performance of the expansion device and shortening the service life of the expansion device.

[0005] Secondly, the center beam of the telescopic device is subjected to complex loads during the use of the bridge. When the wheels run over the telescopic device, especially when the displacement support box is located between the two wheels of the same axle, the lower edge of the center beam below the wheel is subjected to positive bending moment, while the center beam above the displacement support box is subjected to negative bending moment. This complex stress state makes the center beam prone to fatigue damage. Moreover, with the increase in traffic flow and the increase in vehicle load, the load borne by the telescopic device is also increasing. If the load-bearing structure of the telescopic device is not designed reasonably, or if it is improperly operated during replacement and maintenance, it may cause premature damage to the telescopic device and shorten its service life. This not only increases the maintenance cost of the bridge, but may also pose a threat to traffic safety. Utility Model Content

[0006] In order to improve the problem of the short service life of the expansion device, the present utility model provides a long-life bridge expansion device, and the specific technical solution is as follows:

[0007] A long-life bridge expansion device includes side beams and a displacement support box arranged on the side beams. The central axis of the displacement support box in the longitudinal direction of the bridge coincides with the center line of the vehicle wheel track belt in the lane, or the deviation distance between the center line of the vehicle wheel track belt and the center line of the displacement support box is less than or equal to the width of the displacement support box itself.

[0008] When a vehicle passes over the bridge expansion device, since the center line of the vehicle wheel track belt coincides with the central axis of the displacement support box of the expansion device in the longitudinal direction of the bridge or the offset distance is less than or equal to the width of the displacement support box, the displacement support box can effectively support the wheels, so as to reduce the stress level and amplitude of the beams in the expansion device, and can also reduce the damage of the expansion device caused by local stress concentration, improve its overall durability, and is beneficial to improving the overall service life of the expansion device.

[0009] Furthermore, in order to increase the probability that the vehicle wheels pass directly above the displacement support box when passing through the expansion device, the lane demarcation line crossing the expansion device is set as a solid line, and the vehicle wheel track belt is located between two adjacent lane demarcation lines. When the vehicle passes through the expansion device, the solid lane demarcation line restricts the vehicle to drive within the lane, so that the wheel track belt composed of multiple wheel tracks of the vehicle can only be located within the lane formed by the solid lane demarcation lines. Also, since the center line of the vehicle wheel track belt coincides with the central axis of the displacement support box in the longitudinal direction of the bridge or the offset distance is less than or equal to the width of the displacement support box, when the vehicle crosses the expansion device, it can only drive above the displacement support box, which can help avoid the vehicle wheel track belt from deviating too far from the displacement support box and reduce the stress level and amplitude of the beams in the expansion device.

[0010] The present utility model also provides a notch structure for installing the long-life bridge expansion device, and the specific technical solution is as follows:

[0011] A notch structure for installing the long-life bridge expansion device includes a bottom plate and side plates connected to the bottom plate, and the bottom plate and the side plates are integrally formed.

[0012] The bottom plate and the side plates are respectively arranged on the bottom wall and the side wall of the bridge notch, and the bottom plate is used for installing the expansion device.

[0013] Furthermore, the bottom plate and the side plates are connected to the bridge through embedded steel bars;

[0014] Alternatively, an anchorage groove is provided at the end of the bridge. Connecting steel bars connected to the steel bars inside the bridge are provided on both the bottom plate and the side plates. A concrete filling block is provided in the anchorage groove, and a through hole for installing the connecting steel bars is formed in the concrete filling block.

[0015] Furthermore, anchoring steel bars are provided on the bottom plate, and the anchoring steel bars are connected to the anchor plate.

[0016] When pouring a new bridge, the embedded steel bars of the side plate and the bottom plate are welded to the steel bars inside the bridge, and then concrete is poured, so that a steel structure notch can be formed at the end of the bridge.

[0017] When repairing the expansion joint, first cut the concrete at the end of the bridge to form an anchorage groove, then connect the connecting steel bars to the original steel bars inside the bridge, then connect the bottom plate and the side plates to the connecting steel bars, and finally fill the anchorage groove with concrete, so that a new steel structure notch can be built at the end of the bridge.

[0018] When installing the expansion device, connect the anchor plate of the expansion device to the anchoring steel bars, and finally pour concrete in the installation space, then the expansion device can be installed well.

[0019] When replacing the expansion device, chisel the concrete in the installation space and cut the anchoring steel bars and the anchor plate, then the old expansion device can be disassembled. Then place the new expansion device in the installation space and connect the anchoring steel bars to the anchor plate. Since the concrete structure of the expansion joint notch is protected by the side plate and the bottom plate, damage to the bridge structure caused by the chiseling construction can be avoided when chiseling the anchoring concrete in the expansion joint notch.

[0020] In addition, new anchoring steel bars can be installed on the side plate according to the new expansion device, which can avoid repeated construction operations of implanting steel bars at the expansion joint notch of the bridge. This not only reduces the cost, but also avoids the damage to the bridge structure caused by multiple implanting steel bar drillings. It also avoids the situation that after multiple implanting of steel bars in the traditional concrete notch, it is impossible to find a suitable position to drill and implant the anchoring steel bars near the anchor plate of the new expansion device.

[0021] The beneficial technical effects of the present utility model are as follows:

[0022] 1. By making the central axis of the displacement limiting support box coincide with the center line of the vehicle wheel track belt or the deviation distance be less than or equal to the width of the displacement support box, the stress level and amplitude of the beam in the expansion device are effectively reduced, thus significantly improving the overall service life of the expansion device;

[0023] 2. Set the lane demarcation line crossing the expansion device as a solid line to restrict the vehicle to drive within the lane. By restricting the vehicle wheel track with the solid lane demarcation line, it can effectively prevent the vehicle wheel driving track line from deviating too far from the displacement support box;

[0024] 3. When replacing the expansion device, the side plate and bottom plate of the steel structure are used to protect the concrete structure of the expansion joint notch. During the chiseling of the anchoring concrete in the expansion joint notch, the damage to the bridge structure caused by the chiseling construction is avoided, the anchoring performance of the expansion device is enhanced, and thus the overall service life of the expansion joint is improved;

[0025] 4. By welding the anchoring steel bars on the bottom plate instead of the traditional way of implanting steel bars in the concrete, the damage to the bridge concrete structure is reduced, and the corresponding anchoring steel bars can also be welded on the bottom plate according to each anchor plate, which can enhance the anchoring performance of the expansion device and thus extend the service life of the expansion device.

[0026] 5. For multi-girder bridges (T-girders, hollow slab girders, precast composite box girders, etc.), by setting a steel structure notch structure in the expansion joint notch, not only can the stiffness of the expansion joint notch be enhanced, but also the problem that the expansion device is suspended below due to the misalignment of the beam ends during the erection of precast beams can be solved, and the anchoring performance of the expansion device is improved. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a long-life bridge expansion device and the bridge carriageway demarcation line in Embodiment 1 of the present utility model.

[0028] Figure 2 It is a schematic structural diagram of the notch structure in Embodiment 1 of the present utility model.

[0029] Figure 3 It is a schematic structural diagram of the notch structure in Embodiment 2 of the present utility model.

[0030] Description of the reference numerals: 1, middle beam; 2, side beam; 3, displacement support box; 4, anchor plate; 5, carriageway demarcation line; 6, bottom plate; 7, side plate; 8, installation space; 9, anchoring steel bar; 11, embedded steel bar; 12, anchoring groove; 13, connecting steel bar; 14, concrete filling block; 15, through hole. Detailed Embodiment

[0031] The following is a further detailed description of the present utility model in conjunction with the attached Figures 1-3 drawings.

[0032] Embodiment 1

[0033] Refer to Figure 1, A long-life bridge expansion device, comprising a middle beam 1, two side beams 2 and a displacement support box 3. The middle beam 1 is located between the two side beams 2. A plurality of anchor plates 4 are provided on the side beams 2, and the plurality of anchor plates 4 are evenly distributed along the length direction of the side beams 2. The displacement support box 3 is connected to the two side beams 2. The central axis of the displacement support box 3 in the longitudinal direction of the bridge coincides with the center line of the vehicle wheel track belt in the lane, or the deviation distance between the center line of the vehicle wheel track belt and the center line of the displacement support box 3 is less than or equal to the width of the displacement support box 3 itself.

[0034] In the longitudinal direction of the bridge, the lane demarcation line 5 spanning the expansion device is set as a solid line to limit the wheel track line belt to be located between two adjacent lane demarcation lines 5; in this embodiment, the lane demarcation line 5 is a white solid line or a yellow solid line.

[0035] Refer to Figure 2 , This embodiment also discloses a notch structure for installing a long-life bridge expansion device, comprising a bottom plate 6 and side plates 7 connected to the bottom plate 6. In this embodiment, the bottom plate 6 and the side plates 7 are integrally formed and are steel plates; in other embodiments, the bottom plate 6 and the side plates 7 are welded or connected by bolts.

[0036] The bottom plate 6 and the side plates 7 are respectively arranged on the bottom wall and the side wall of the bridge notch, and an installation space 8 for installing the expansion device is left between the bottom plate 6 and the side plates 7. Anchor bars 9 are provided on the bottom plate 6, and the anchor bars 9 are connected to the anchor plates 4; in this embodiment, the anchor bars 9 are welded to the bottom plate 6.

[0037] In this embodiment, the bottom plate 6 and the side plates 7 are connected to the bridge through embedded steel bars 11.

[0038] Embodiment 2

[0039] Refer to Figure 3 , The difference between this embodiment and Embodiment 1 is that an anchor groove 12 is provided at the end of the bridge. Connecting steel bars 13 connected to the steel bars in the bridge are provided on both the bottom plate 6 and the side plates 7. A concrete filling block 14 is provided in the anchor groove 12, and through holes 15 for installing the connecting steel bars 13 are formed in the concrete filling block 14.

[0040] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A long-life bridge expansion device, including side beams (2), characterized in that: It further includes a displacement support box (3) arranged on the side beam (2). In the longitudinal direction of the bridge, the central axis of the displacement support box (3) coincides with the center line of the vehicle wheel track belt in the lane, or the deviation distance between the center line of the vehicle wheel track belt and the center line of the displacement support box (3) is less than or equal to the width of the displacement support box (3) itself.

2. The long-life bridge expansion device according to claim 1, characterized in that: In the longitudinal direction of the bridge, the lane demarcation line (5) spanning the expansion joint is set as a solid line.

3. A notch structure for installing the long-life bridge expansion device as described in claim 1, characterized in that: It includes a bottom plate (6) and side plates (7) connected to the bottom plate (6). The bottom plate (6) and the side plates (7) are respectively arranged on the bottom wall and side walls of the bridge notch, and the bottom plate (6) is used for installing the expansion joint.

4. The notch structure according to claim 3, characterized in that: The bottom plate (6) and the side plates (7) are connected to the bridge through embedded steel bars (11); Alternatively, an anchorage groove (12) is provided at the end of the bridge. Connecting steel bars (13) connected to the steel bars in the bridge are provided on both the bottom plate (6) and the side plates (7). A concrete filling block (14) is provided in the anchorage groove (12), and a through hole (15) for installing the connecting steel bar (13) is formed in the concrete filling block (14).

5. The notch structure according to claim 3, wherein: Anchoring steel bars (9) are provided on the bottom plate (6), and the anchoring steel bars (9) are connected to the anchor plate (4).

6. The notch structure according to claim 3, characterized in that: The bottom plate (6) and the side plates (7) are integrally formed.

Images