Structure suitable for widening longitudinal expansion joint of bridge

Abstract

The utility model provides a structure suitable for a spliced bridge longitudinal expansion joint, which comprises an existing bridge section, a spliced bridge section, a reinforcing steel bar reinforcing component, a sealing structure, an asphalt layer and a concrete layer, the asphalt layer and the concrete layer are sequentially arranged from top to bottom, and a cantilever end of the existing bridge section and a cantilever end of the spliced bridge section are arranged at an interval to form the expansion joint. The cantilever end of the existing bridge section and the cantilever end of the widened bridge section are sunken to form stepped notches oppositely formed in the transverse bridge direction, each stepped notch comprises an upper notch and a lower notch, and a steel bar reinforcing assembly is connected into each stepped notch. The connecting pavement layer between the existing bridge section and the widened bridge section is re-paved by arranging the step-type notches, the stress of the bridge surface can be released, cracks can be reduced in cooperation with the reinforcing steel bar reinforcing assemblies, the whole structure is simple and convenient to construct, rainwater leakage can be prevented by arranging the sealing structure, the waterproof effect is good, and the whole structure is low in cost and suitable for popularization and application. Wide application prospects are realized.

Description

Technical Field

[0001] This utility model relates to the field of bridge widening technology, and in particular to a structure suitable for longitudinal expansion joints in bridge widening. Background Technology

[0002] With rapid socio-economic development and increasing traffic volume year by year, bridges need to be upgraded and expanded to improve their service capacity. If the existing bridge is in good technical condition, in order to save land resources and reduce total investment, the existing bridge is usually widened on one or both sides to increase its traffic capacity.

[0003] Because existing bridges and widened bridges were constructed at different times, they differ in structural shrinkage deformation, foundation settlement, and deflection. To minimize the impact of the widened bridge on the existing bridge, the upper and lower parts of the two are usually not connected, leaving only a longitudinal joint between them, either directly separating them or using expansion joints. Direct separation ensures clear stress distribution and no mutual interference, but it affects driving comfort, causing vehicle bouncing; under vehicle impact, the cantilever ends of the main beam are prone to damage, making repair difficult; rainwater and sewage from the bridge deck can flow under the bridge, affecting traffic or navigation. While expansion joints meet the expansion requirements, they are complex in structure, cumbersome to construct, difficult to replace, and costly.

[0004] Therefore, it is necessary to propose a structure suitable for longitudinal expansion joints of widened bridges to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a structure suitable for longitudinal expansion joints of widened bridges, so as to solve the problems of easy vehicle bounce and water leakage caused by the separation of expansion joints in the prior art.

[0006] To achieve the above objectives, this utility model provides a structure suitable for longitudinal expansion joints in widened bridges, comprising an existing bridge section, a widened bridge section, a steel reinforcement assembly, a sealing structure, and an asphalt layer and a concrete layer arranged sequentially from top to bottom; wherein,

[0007] Expansion joints are provided at intervals between the cantilever ends of the existing bridge section and the widened bridge section, and the cantilever ends of the existing bridge section and the widened bridge section are respectively recessed to form stepped grooves arranged opposite each other along the transverse direction of the bridge; wherein,

[0008] Each of the stepped slots includes an upper slot and a lower slot, the concrete layer is connected to the two lower slots, the sealing structure is connected between the two concrete layers, and the asphalt layer is connected to the two upper slots;

[0009] Each of the stepped slots is connected to a steel reinforcement component, and the steel reinforcement components in two stepped slots are arranged opposite each other along the transverse direction.

[0010] Preferably, the steel reinforcement assembly includes multiple longitudinal steel bars, and every two longitudinal steel bars spaced apart along the transverse direction constitute a longitudinal steel bar group. One group of longitudinal steel bars is provided in the concrete layer, and two groups of longitudinal steel bars spaced apart along the vertical direction are provided in the asphalt layer.

[0011] Preferably, the steel reinforcement assembly further includes a plurality of portal steel bars spaced apart along the longitudinal direction of the bridge. The top end of the portal steel bar is disposed in the asphalt layer, the bottom end of the portal steel bar extends downward into the concrete layer, and the longitudinal steel bars are all welded to the inner side of the portal steel bar.

[0012] Preferably, the reinforcing steel reinforcement assembly further includes hot-rolled angle steel, which is disposed in the asphalt layer and welded to the outer end of the top of the portal reinforcement near the expansion joint.

[0013] Preferably, the sealing structure uses a sponge sealing strip.

[0014] Preferably, the asphalt layer is filled between the two upper slots.

[0015] Preferably, the width of the lower groove is 15cm to 17cm, and the width of the upper groove is 25cm to 27cm.

[0016] Preferably, the longitudinal spacing between any two adjacent portal reinforcement bars is 15cm to 17cm.

[0017] Preferably, both the existing bridge section and the widened bridge section include a bridge deck pavement layer and a cast-in-place bridge deck layer arranged from top to bottom, and a waterproof layer is applied between the bridge deck pavement layer and the cast-in-place bridge deck layer.

[0018] Preferably, the width of the expansion joint is 1cm to 2cm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides a structure for longitudinal expansion joints of widened bridges, comprising an existing bridge section, a widened bridge section, steel reinforcement components, a sealing structure, and asphalt and concrete layers arranged sequentially from top to bottom. Expansion joints are formed at intervals between the cantilever ends of the existing bridge section and the widened bridge section. The cantilever ends of both sections are recessed to form stepped grooves arranged opposite each other along the transverse direction. Each stepped groove includes an upper groove and a lower groove. The concrete layer is connected to the two lower grooves, the sealing structure is connected between the two concrete layers, and the asphalt layer is connected to the two upper grooves. A steel reinforcement component is connected to each stepped groove, and the steel reinforcement components in the two stepped grooves are arranged opposite each other along the transverse direction. By setting up stepped grooves to repave the connecting pavement layer between the existing bridge section and the widened bridge section, the stress on the bridge deck can be released. Combined with steel reinforcement components, cracks can be reduced. The whole structure is simple, easy to construct, and has a sealing structure to prevent rainwater leakage, providing good waterproofing. The overall construction cost is low and has broad application prospects. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of the overall structure in one embodiment of the present invention.

[0023] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] Explanation of icon numbers:

[0025] 110. Existing bridge section; 111. Expansion joint; 120. Widened bridge section; 121. Bridge deck pavement layer; 122. Cast-in-place bridge deck layer; 123. Waterproof layer; 130. Reinforcing steel reinforcement components; 131. Longitudinal reinforcement; 132. H-beam reinforcement; 133. Hot-rolled angle steel; 140. Sealing structure; 150. Asphalt layer; 160. Concrete layer; 170. Stepped groove; 171. Upper groove; 172. Lower groove. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] Please see the appendix Figure 1 This utility model provides a structure for a longitudinal expansion joint 111 of a widened bridge, comprising an existing bridge section 110, a widened bridge section 120, a steel reinforcement component 130, a sealing structure 140, and an asphalt layer 150 and a concrete layer 160 arranged sequentially from top to bottom. First, it should be noted that in this application, the transverse direction refers to the widening direction of the bridge, while the longitudinal direction refers to the extension direction of the bridge. Unlike existing expansion joint 111 structures, which, if directly separated, have clearly defined forces and do not affect each other, but affect driving comfort and cause vehicle bouncing, and are prone to damage at the cantilever end of the main beam under vehicle impact, making repair difficult, and allowing rainwater and sewage from the bridge deck to flow under the bridge, affecting traffic or navigation; and while expansion devices meet expansion requirements, their structure is complex, construction is cumbersome, replacement is difficult, and costs are high. This application solves the above-mentioned defects in the prior art by providing a structure for a longitudinal expansion joint 111 of a widened bridge, as detailed below:

[0031] Expansion joints 111 are formed at intervals between the cantilever ends of the existing bridge section 110 and the widened bridge section 120. The cantilever ends of both sections are recessed to form stepped slots 170 arranged opposite each other in the transverse direction. Each stepped slot 170 includes an upper slot 171 and a lower slot 172. A concrete layer 160 is connected to the two lower slots 172, a sealing structure 140 is connected between the two concrete layers 160, and an asphalt layer 150 is connected to the two upper slots 171. A reinforcing steel reinforcement assembly 130 is connected to each stepped slot 170, and the reinforcing steel reinforcement assemblies 130 in the two stepped slots 170 are arranged opposite each other in the transverse direction.

[0032] Specifically, the structure of the longitudinal expansion joint 111 of the widened bridge in this application includes an existing bridge section 110, a widened bridge section 120, a steel reinforcement component 130, a sealing structure 140, and an asphalt layer 150 and a concrete layer 160 arranged sequentially from top to bottom. The cantilever end of the widened bridge section 120 is spaced apart from the cantilever end of the existing bridge section 110 to reserve a longitudinal expansion joint 111. The expansion joint 111 is usually set to be 1cm to 2cm wide. Preferably, in this application, it is set to be a 2cm wide expansion joint 111. In order to change the structural strength at the cantilever end of the widened bridge section 120 and the cantilever end of the existing bridge section 110, reduce damage and ensure comfort, the stepped groove 170 needs to be recessed and a new structural pavement layer needs to be repaved.

[0033] The stepped grooves 170 of the existing bridge section 110 and the stepped grooves 170 of the widened bridge section 120 are arranged opposite each other along the transverse direction of the bridge to ensure uniform stress and smooth changes in the structure on both sides. The stepped grooves 170 of the existing bridge section 110 can be formed by chiseling away material, while those of the widened bridge section 120 can be formed by pre-reservation. Each stepped groove 170 includes an upper groove 171 and a lower groove 172. The lower groove 172 is used for laying the concrete layer 160, which serves to bear loads and transfer loads, providing a solid foundation for traffic. Preferably, it can be filled with high-strength small-aggregate concrete, which has higher strength than the original cast-in-place bridge deck layer 122 and is more suitable for the structural strength at the expansion joint 111. The upper groove 171 is used for laying the concrete layer 160. The asphalt layer 150 is laid, and its good flexibility and plasticity can form a smooth and continuous road surface, reducing driving bumps and improving driving comfort. In a preferred embodiment of this application, it can use elastomeric modified asphalt to have better flexibility and facilitate the release of bridge deck stress. The sealing structure 140 is sealed between the concrete layers 160 of the two lower grooves 172 to prevent rainwater leakage and avoid rainwater and sewage from flowing under the bridge, affecting traffic or navigation. Preferably, the sealing structure 140 can be a flexible sponge sealing strip, which can better adapt to deformation in addition to waterproofing. Furthermore, the steel reinforcement component 130 is used to strengthen the structural strength of the asphalt layer 150 and the concrete layer 160 to reduce the generation of cracks and avoid long-term maintenance.

[0034] In a preferred embodiment of the present invention, the steel reinforcement component 130 includes a plurality of longitudinal steel bars 131, and every two longitudinal steel bars 131 arranged at intervals along the transverse direction constitute a group of longitudinal steel bars 131. A group of longitudinal steel bars 131 is provided in the concrete layer 160, and two groups of longitudinal steel bars 131 are arranged at intervals along the vertical direction in the asphalt layer 150.

[0035] It should be noted that the longitudinal steel bars 131 can effectively restrain the longitudinal shrinkage in the pavement layer, reduce the generation and expansion of cracks, reduce uneven settlement of the pavement layer, and reduce pavement damage caused by settlement. Considering the load generated by vehicles and pedestrians directly contacting the asphalt layer 150, two more sets of longitudinal steel bars 131 are provided in the asphalt layer 150 to increase the load-bearing capacity of the structure and reduce cracking.

[0036] In a preferred embodiment of the present invention, the steel reinforcement assembly 130 further includes a plurality of portal steel bars 132 arranged at intervals along the longitudinal direction of the bridge. The top end of the portal steel bar 132 is disposed in the asphalt layer 150, and the bottom end of the portal steel bar 132 extends downward into the concrete layer 160. The longitudinal steel bars 131 are all welded to the inner side of the portal steel bar 132.

[0037] It should be noted that the portal reinforcement 132 can improve shear resistance. After being welded with the longitudinal reinforcement 131, it forms a steel mesh, which enhances the integrity of the pavement structure. At the same time, the portal reinforcement 132 can also effectively resist cracks in the pavement layer caused by shrinkage and temperature changes. In this way, it works well with the longitudinal reinforcement 131 to ensure the overall pavement strength at the expansion joint 111. Among them, the portal reinforcement 132 of the existing bridge section 110 can be installed by rebar installation, while the portal reinforcement 132 of the widened bridge section 120 can be pre-embedded. Preferably, its diameter is not less than 16mm.

[0038] In a preferred embodiment of the present invention, the steel reinforcement component 130 further includes a hot-rolled angle steel 133, which is disposed in the asphalt layer 150 and welded to the outer end of the top of the portal steel bar 132 near the expansion joint 111.

[0039] It is worth noting that the hot-rolled angle steel 133 can provide good support and reinforcement for the road surface. It is welded to the outer top of the portal steel bar 132 near the expansion joint 111. In this way, when a vehicle passes through the expansion joint 111 and applies pressure load to the corners of the top surfaces of the two asphalt layers 150, the hot-rolled angle steel 133 can play a role in protecting the corners. Preferably, the hot-rolled angle steel 133 can be a 56mm*8mm equilateral angle steel.

[0040] Furthermore, the asphalt layer 150 is filled between the two upper slots 171.

[0041] It should be noted that this can fill the gap between the two upper grooves 171 and the asphalt layer 150, thereby improving the integrity and adaptability of the overall pavement layer and enhancing driving comfort.

[0042] Furthermore, the width of the lower groove 172 is 15cm to 17cm, and the width of the upper groove 171 is 25cm to 27cm.

[0043] It should be understood that, considering the relationship between construction cost and structural strength, in a preferred embodiment of this application, the width of the lower slot 172 can be set to 15cm, and the width of the upper slot 171 can be set to 25cm. Those skilled in the art can choose according to actual needs.

[0044] Furthermore, the longitudinal spacing between any two adjacent portal reinforcement bars 132 is 15cm to 17cm.

[0045] It should be noted that, preferably, the diameter can be set to 15cm to take into account cost and the uniformity of overall structural strength. When connecting the portal reinforcement 132 to the hot-rolled angle steel 133, double-sided welding is adopted. Double-sided welding can make the weld better formed, the weld point more uniformly stressed, and reduce stress concentration. The weld length during welding should not be less than 5 times the diameter of the reinforcement.

[0046] Furthermore, both the existing bridge section 110 and the widened bridge section 120 include a bridge deck pavement layer 121 and a bridge deck cast-in-place layer 122 arranged from top to bottom, and a waterproof layer 123 is applied between the bridge deck pavement layer 121 and the bridge deck cast-in-place layer 122.

[0047] It should be noted that the bridge deck pavement layer 121 and the bridge deck cast-in-place layer 122 are the road surface layer structures of the existing bridge section 110 and the widened bridge section 120, excluding the expansion joint 111. The waterproof layer 123 is set between the bridge deck pavement layer 121 and the bridge deck cast-in-place layer 122, which can effectively block water penetration, protect the base layer and subgrade, reduce the occurrence of defects, extend the service life of the road surface, and improve driving comfort and safety.

[0048] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A construction suitable for use in a longitudinal contraction joint of a widened bridge, characterised in that, This includes the existing bridge section, the widened bridge section, the steel reinforcement components, the sealing structure, and the asphalt layer and concrete layer arranged sequentially from top to bottom; among which, Expansion joints are spaced apart between the cantilever ends of the existing bridge section and the widened bridge section, and each of the cantilever ends of the existing bridge section and the widened bridge section has recessed stepped grooves arranged opposite each other along the transverse direction; wherein, Each of the stepped slots includes an upper slot and a lower slot, the concrete layer is connected to the two lower slots, the sealing structure is connected between the two concrete layers, and the asphalt layer is connected to the two upper slots; Each of the stepped slots is connected to a steel reinforcement component, and the steel reinforcement components in two stepped slots are arranged opposite each other along the transverse direction.

2. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 1, characterized in that, The steel reinforcement assembly includes multiple longitudinal steel bars. Every two longitudinal steel bars spaced apart along the transverse direction constitute a longitudinal steel bar group. One group of longitudinal steel bars is provided in the concrete layer, and two groups of longitudinal steel bars spaced apart along the vertical direction are provided in the asphalt layer.

3. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 2, characterized in that, The steel reinforcement assembly also includes a plurality of portal steel bars spaced apart along the longitudinal direction of the bridge. The top end of the portal steel bar is located in the asphalt layer, and the bottom end of the portal steel bar extends downward into the concrete layer. The longitudinal steel bars are all welded to the inside of the portal steel bar.

4. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 3, characterized in that, The steel reinforcement assembly also includes hot-rolled angle steel, which is disposed in the asphalt layer and welded to the outer end of the top of the portal reinforcement near the expansion joint.

5. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 1, wherein The sealing structure uses a sponge sealing strip.

6. The construction suitable for longitudinal contraction joint of widened bridge according to claim 1, characterized by, The asphalt layer is filled between the two upper slots.

7. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 1, wherein The width of the lower groove is 15cm to 17cm, and the width of the upper groove is 25cm to 27cm.

8. The construction suitable for longitudinal contraction joint of widened bridge according to claim 3, characterized by, The longitudinal spacing between any two adjacent portal reinforcement bars is 15cm to 17cm.

9. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 1, wherein Both the existing bridge section and the widened bridge section include a bridge deck pavement layer and a cast-in-place bridge deck layer arranged from top to bottom, with a waterproof layer applied between the bridge deck pavement layer and the cast-in-place bridge deck layer.

10. The construction suitable for longitudinal contraction joint of a widened bridge according to claim 1, characterized by, The width of the expansion joint is 1cm to 2cm.

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