New and old hollow slab bridge widening structure

Abstract

The utility model provides a new and old hollow slab bridge widening structure which comprises an existing hollow slab beam, a widened hollow slab beam, a wet joint structure and a steel bar assembly, the existing hollow slab beam is recessed to form a first groove, and the widened hollow slab beam is recessed to form a second groove. The wet joint structure comprises an existing section, a splicing section and a widening section which are spliced side by side in the longitudinal direction, the existing section is connected into the first groove, the widening section is connected into the second groove, and the reinforcing steel bar assembly comprises a transverse reinforcing steel bar assembly, a longitudinal reinforcing steel bar assembly and a longitudinal connecting assembly. The wet joint structure is distributed in three sections, the contact area is increased, overall cast-in-place is adopted, the longitudinal steel bar assemblies and the longitudinal connecting assemblies are embedded in a penetrating mode to improve the splicing and widening connection integrity, the excellent overall performance is achieved, it can be ensured that new and old structures are jointly stressed, and differential settlement is avoided; the problem that longitudinal cracks are prone to being generated during splicing expansion joint pavement is effectively solved, rainwater can be prevented from permeating and falling into the position below a bridge deck from splicing seams, and the environment below the bridge is improved.

Description

Technical Field

[0001] This utility model relates to the field of hollow slab renovation technology, and in particular to a new structure for widening old and new hollow slab bridges. Background Technology

[0002] Due to the rapid increase in vehicles, which was not anticipated in the early design phases, the service level of highways is no longer sufficient to meet current driving demands, necessitating urgent reconstruction and expansion projects. Domestic and international experts have conducted extensive research on the numerous cracks that occur at the joints of widened bridges during later operation, as well as the stress conditions and joint cracking deformation of the old and new bridges. They have also carried out in-depth research on the cracking mechanism of the concrete at the joints and the interaction mechanism between the concrete of the old and new beams, achieving certain results.

[0003] When widening and connecting old and new hollow slab beams, the different stiffness of the old and new beams and the different connection methods have a significant impact on the overall performance and stress characteristics of the bridge structure. In the existing widening structure, the splicing part between the old hollow slab beam and the widened hollow slab beam has poor integrity, which can lead to inconsistent settlement, making it easy to crack and affecting the flatness of the bridge deck.

[0004] Therefore, it is necessary to propose a new structure for widening old and new hollow slab 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 new and old hollow slab bridge widening structure to solve the problem that the existing widening structure has poor overall integrity, which leads to inconsistent settlement.

[0006] To achieve the above objectives, this utility model provides a new structure for widening existing hollow slab bridges, including existing hollow slab beams, widened hollow slab beams, a wet joint structure, and reinforcing steel components. The existing hollow slab beams and the widened hollow slab beams are spaced apart along the longitudinal direction of the bridge. A first groove is formed at the end of the existing hollow slab beam closest to the widened hollow slab beam, and a second groove is formed at the end of the widened hollow slab beam closest to the existing hollow slab beam.

[0007] The wet joint structure includes an existing section, a splicing section, and a widening section that are spliced ​​together in parallel along the longitudinal direction. The splicing section is connected between the existing hollow slab beam and the widened hollow slab beam. The existing section is connected in the first groove, and the widening section is connected in the second groove.

[0008] The steel reinforcement assembly includes a transverse steel reinforcement assembly, a longitudinal steel reinforcement assembly, and a longitudinal connecting assembly. The transverse steel reinforcement assembly is embedded in the existing section, the spliced ​​section, and the widened section. The longitudinal steel reinforcement assembly passes through the existing section, the spliced ​​section, and the widened section in sequence. The longitudinal connecting assembly is built into the spliced ​​section and its two ends extend into the existing hollow slab beam and the widened hollow slab beam, respectively.

[0009] Preferably, the number of transverse steel reinforcement assemblies in the splicing segment is two layers, and the two layers of transverse steel reinforcement assemblies are arranged vertically at intervals to be distributed at the top and bottom of the splicing segment respectively.

[0010] Preferably, the longitudinal connection assembly includes a first rebar assembly, a second rebar assembly, and a connector. The two ends of the first rebar assembly are respectively embedded in the existing hollow slab beam and the splice section. The two ends of the second rebar assembly are respectively embedded in the widened hollow slab beam and the splice section. The first rebar assembly and the second rebar assembly are connected by the connector.

[0011] Preferably, the longitudinal connecting assembly is disposed near the lower transverse reinforcing bar assembly.

[0012] Preferably, the end of the second rebar assembly extending into the widened hollow slab beam is bent.

[0013] Preferably, the top of the wet joint structure is flush with the top of the existing hollow slab beam and the widened hollow slab beam.

[0014] Preferably, the longitudinal length of the existing segment is greater than the longitudinal length of the widened segment.

[0015] Preferably, the connector includes a plurality of longitudinally spaced short connecting bars, which connect the first rebar assembly and the second rebar assembly.

[0016] Preferably, the reinforcing steel assembly further includes a stirrup assembly, which is attached to the outside of the two layers of transverse reinforcing steel assemblies of the splice segment.

[0017] Preferably, it also includes a bridge deck pavement section, which is laid on top of the existing hollow slab beam, the wet joint structure, and the widened hollow slab beam.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model provides a new type of hollow slab bridge widening structure, including existing hollow slab beams, widened hollow slab beams, wet joint structures, and steel reinforcement components. The existing hollow slab beams and widened hollow slab beams are spaced apart along the longitudinal direction of the bridge. A first groove is formed at the end of the existing hollow slab beam closest to the widened hollow slab beam, and a second groove is formed at the end of the widened hollow slab beam closest to the existing hollow slab beam. The wet joint structure includes existing sections, splicing sections, and widened sections spliced ​​together longitudinally. The splicing section connects the existing hollow slab beams and the widened hollow slab beams. The existing section connects to the first groove, and the widened section connects to the second groove. The steel reinforcement components include transverse steel reinforcement components, longitudinal steel reinforcement components, and longitudinal connecting components. Transverse steel reinforcement components are pre-embedded in the existing section, splicing section, and widened section. The longitudinal steel reinforcement components sequentially penetrate the existing section, splicing section, and widened section. The longitudinal connecting components are embedded in the splicing section, with both ends extending into the existing hollow slab beams and the widened hollow slab beams, respectively. This wet joint structure is distributed in three sections to increase the contact area of ​​the connection parts. It is cast in place as a whole, and the longitudinal steel reinforcement components and longitudinal connecting components are embedded through to improve the integrity of the splicing connection. It has excellent overall performance, which can ensure that the new and old structures share the load, avoid differential settlement, effectively solve the problem of longitudinal cracks that are easy to occur in the splicing expansion joint pavement, and also prevent rainwater from seeping into the bridge deck from between the splicing joints, thus improving the environment under the bridge. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a cross-sectional schematic diagram of the overall structure in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram showing the distribution of the reinforcing bar assembly 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] 10. Existing hollow slab beam; 110. First groove; 120. Bridge deck pavement section; 20. Widened hollow slab beam; 210. Second groove; 30. Wet joint structure; 310. Existing section; 320. Spliced ​​section; 330. Widened section; 40. Reinforcing steel assembly; 410. Transverse reinforcing steel assembly; 420. Longitudinal reinforcing steel assembly; 430. Longitudinal connection assembly; 431. First rebar assembly; 432. Second rebar assembly; 433. Connector; 440. Stirrup assembly. 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 1-2This utility model provides a new and old hollow slab bridge widening structure, including an existing hollow slab beam 10, a widened hollow slab beam 20, a wet joint structure 30, and a steel reinforcement assembly 40. The existing hollow slab beam 10 and the widened hollow slab beam 20 are spaced apart along the longitudinal direction of the bridge. A first groove 110 is formed at the end of the existing hollow slab beam 10 near the widened hollow slab beam 20, and a second groove 210 is formed at the end of the widened hollow slab beam 20 near the existing hollow slab beam 10. This differs from existing widening structures where the joint between the old and widened hollow slab beams has poor integrity, leading to inconsistent settlement and potential cracking, affecting the flatness of the bridge deck. This application solves the above-mentioned defects in the prior art by providing a new and old hollow slab bridge widening structure, as detailed below:

[0031] The wet joint structure 30 includes an existing section 310, a spliced ​​section 320, and a widened section 330 that are spliced ​​side by side along the longitudinal direction. The spliced ​​section 320 is connected between the existing hollow slab beam 10 and the widened hollow slab beam 20. The existing section 310 is connected in the first groove 110, and the widened section 330 is connected in the second groove 210. The reinforcing steel assembly 40 includes a transverse reinforcing steel assembly 410, a longitudinal reinforcing steel assembly 420, and a longitudinal connecting assembly 430. The transverse reinforcing steel assembly 410 is embedded in the existing section 310, the spliced ​​section 320, and the widened section 330. The longitudinal reinforcing steel assembly 420 passes through the existing section 310, the spliced ​​section 320, and the widened section 330 in sequence. The longitudinal connecting assembly 430 is built into the spliced ​​section 320, and its two ends extend into the existing hollow slab beam 10 and the widened hollow slab beam 20, respectively.

[0032] Specifically, the structure with wet joints in the widening structure has better connection performance than no connection, making it more suitable for widening hollow slab beam bridges on first-class or second-class highways with less heavy traffic (such as the hollow slab beam application scenario of this application). Therefore, the existing hollow slab beam 10 and the widened hollow slab beam 20 are spaced apart along the longitudinal direction of the bridge to form a space for the installation and connection of the wet joint structure 30. In this application, the wet joint structure 30 adopts a three-segment distribution structure, so that it is not only set in the space, but also to improve the overall connection with the hollow slab beam segments on both sides. Therefore, the first groove 110 and the second groove 210 formed on the existing hollow slab beam 10 and the widened hollow slab beam 20 (at the ends that are close to each other) are used for the installation and connection of part of the ends of the wet joint structure 30.

[0033] The wet joint structure 30 includes an existing section 310, a spliced ​​section 320, and a widened section 330, which are longitudinally spliced ​​side by side. These three sections are simultaneously cast in place to increase the contact area with the hollow slab beam and improve the overall connection integrity. The existing section 310 connects to the first groove 110, the widened section 330 connects to the second groove 210, and the spliced ​​section 320 connects between the existing hollow slab beam 10 and the widened hollow slab beam 20. This also prevents rainwater from seeping through the gaps into the bridge deck, improving the environment under the bridge. Since the wet joint structure 30 is constructed using cast-in-place concrete, the addition of the reinforcing steel assembly 40 increases the overall strength of the wet joint structure 30. This assembly includes a transverse reinforcing steel assembly 410, a longitudinal reinforcing steel assembly 420, and a longitudinal connecting assembly 430. The transverse reinforcing steel assembly 410 and the longitudinal reinforcing steel assembly... The 420 sections can form a mesh-like steel reinforcement structure, which significantly improves the load-bearing performance and crack resistance. The transverse steel reinforcement assembly 410 includes multiple transverse steel bars arranged longitudinally at intervals to be evenly distributed in the existing section 310, spliced ​​section 320, and widened section 330. The longitudinal steel reinforcement assembly 420 includes multiple longitudinal steel bars arranged transversely at intervals. Welding them to the transverse steel bars not only strengthens the overall connection between the transverse steel bars, but also improves the overall connection between the three wet joint sections by distributing them through the existing section 310, spliced ​​section 320, and widened section 330. Furthermore, the two ends of the longitudinal steel reinforcement assembly 420 can extend out of the existing section 310 and widened section 330 respectively, which facilitates welding with the steel bars in the existing hollow slab beam 10 and widened hollow slab beam 20 respectively, thereby improving the overall connection between the wet joint structure 30 and the existing hollow slab beam 10 and widened hollow slab beam 20 after cast-in-place molding.

[0034] In addition, considering that the splicing segment 320 extends downwards and is located in the interval space, the two sides of the splicing segment 320 located in the interval space are in direct contact with the existing hollow slab beam 10 and the widened hollow slab beam 20. Therefore, the longitudinal connecting component 430 is used to strengthen the overall connection between the splicing segment 320 and the existing hollow slab beam 10 and the widened hollow slab beam 20. By pre-embedding the longitudinal connecting component 430 in the splicing segment 320 and extending both ends into the existing hollow slab beam 10 and the widened hollow slab beam 20 respectively, the overall connection at this position is improved. The above structural features can ensure that the old and new structures share the load, avoid differential settlement, and effectively solve the problem that longitudinal cracks are easily generated in the splicing expansion joint paving.

[0035] In a preferred embodiment of the present invention, the number of transverse steel reinforcement assemblies 410 in the splicing segment 320 is two layers, and the two layers of transverse steel reinforcement assemblies 410 are arranged vertically at intervals to be distributed at the top and bottom of the splicing segment 320 respectively.

[0036] It should be noted that, considering the structural feature of the splicing segment 320 extending downward with a large thickness, multiple layers of the transverse steel reinforcement assembly 410 are set to ensure that the structure is subjected to uniform stress and that the bottom of the structure is also distributed with reinforcing bars. Specifically, considering cost and structural strength, this application can set two layers so that the two layers of transverse steel reinforcement assembly 410 are respectively distributed at the top and bottom of the splicing segment 320.

[0037] Furthermore, to improve the overall connection between the two layers of transverse steel reinforcement assemblies 410, stirrup assemblies 440 can be added, which can also improve the shear resistance effect. It is understood that the stirrup assembly 440 includes a plurality of stirrups arranged at intervals along the transverse direction. The stirrup cross section is square and can be used to clamp and connect the two layers of transverse steel reinforcement assemblies 410 on the outside of the splicing section 320.

[0038] In a preferred embodiment of this utility model, the longitudinal connection component 430 includes a first rebar assembly 431, a second rebar assembly 432, and a connector 433. The two ends of the first rebar assembly 431 are respectively embedded in the existing hollow slab beam 10 and the splicing section 320. The two ends of the second rebar assembly 432 are respectively embedded in the widened hollow slab beam 20 and the splicing section 320. The first rebar assembly 431 and the second rebar assembly 432 are connected by the connector 433.

[0039] It should be noted that rebar anchoring can be used to improve connection strength without damaging the original structure, making it suitable for the connection between the splice segment 320 and the existing hollow slab beam 10 and the widened hollow slab beam 20 in the scenario of widening bridges in this application; specifically, both ends of the first rebar anchoring component 431 are respectively pre-embedded in the existing hollow slab beam 10 and the splice segment 320 to strengthen the connection between the splice segment 320 and the existing hollow slab beam 10. This is reflected in the fact that both ends of the second rebar anchoring component 432 are respectively pre-embedded in the widened hollow slab beam 20 and the existing hollow slab beam 10. The splicing segment 320 is designed to enhance the overall connection between the splicing segment 320 and the widened hollow slab beam 20. It is worth mentioning that the connection member 433 can also make the first rebar assembly 431 and the second rebar assembly 432 connected as one unit. The first rebar assembly 431 typically includes multiple first rebars spaced laterally, and the second rebar assembly 432 also includes multiple second rebars spaced laterally. Thus, each connection member 433 is connected to the corresponding first and second rebars arranged vertically.

[0040] Preferably, the connector 433 can be in the form of multiple longitudinally spaced short connecting bars, which facilitates construction and the short bars can be taken from the steel bars remaining on site, thereby improving the overall integrity of the connection and reducing construction costs.

[0041] In a preferred embodiment of the present invention, the longitudinal connecting component 430 is disposed close to the lower transverse reinforcing bar component 410.

[0042] It is worth noting that the top of the splice segment 320 can improve the overall connection with the structures on both sides through the longitudinal steel reinforcement assembly 420, while the bottom can mainly improve the overall connection through the longitudinal connecting assembly 430. Therefore, the longitudinal connecting assembly 430 can be set close to the lower transverse steel reinforcement assembly 410 (i.e., set close to the bottom), so that the entire splice segment 320 can better avoid the problem of longitudinal cracks.

[0043] In a preferred embodiment of the present invention, the end of the second rebar assembly 432 extending into the widened hollow slab beam 20 is bent.

[0044] It is worth noting that this strengthens the connection between the concrete and the widened hollow slab beam 20, increases the shear area and flexural bearing capacity, and makes the position of the second rebar end more fixed to reduce the possibility of rebar displacement.

[0045] Furthermore, the top of the wet joint structure 30 is flush with the top of the existing hollow slab beam 10 and the widened hollow slab beam 20.

[0046] It should be noted that this allows the wet joint structure 30 to maintain the same surface height as the asphalt layer of the hollow slab beams on both sides, which facilitates the subsequent laying of the top bridge deck pavement section 120, ensuring a smooth road surface and facilitating traffic.

[0047] Furthermore, the longitudinal length of the existing segment 310 is greater than the longitudinal length of the widened segment 330.

[0048] It should be understood that, considering that the structural length of the widened section 330 is usually smaller than that of the existing end, the distribution of the widened section 330 can be appropriately reduced so that it does not need to be consistent with the length of the existing section 310, provided that the structural connection stability is sufficient. This can save processing costs and reduce the removal of the asphalt layer of the widened hollow slab beam 20, thereby forming a structural form in which the longitudinal length of the existing section 310 is greater than the longitudinal length of the widened section 330.

[0049] 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 new and old hollow slab bridge widening structure, characterized in that, The structure includes existing hollow slab beams, widened hollow slab beams, wet joint structures, and reinforcing steel components. The existing hollow slab beams and the widened hollow slab beams are spaced apart along the longitudinal direction of the bridge. A first groove is formed at the end of the existing hollow slab beam closest to the widened hollow slab beam, and a second groove is formed at the end of the widened hollow slab beam closest to the existing hollow slab beam. The wet joint structure includes an existing section, a splicing section, and a widening section that are spliced ​​together in parallel along the longitudinal direction. The splicing section is connected between the existing hollow slab beam and the widened hollow slab beam. The existing section is connected in the first groove, and the widening section is connected in the second groove. The steel reinforcement assembly includes a transverse steel reinforcement assembly, a longitudinal steel reinforcement assembly, and a longitudinal connecting assembly. The transverse steel reinforcement assembly is embedded in the existing section, the spliced ​​section, and the widened section. The longitudinal steel reinforcement assembly passes through the existing section, the spliced ​​section, and the widened section in sequence. The longitudinal connecting assembly is built into the spliced ​​section and its two ends extend into the existing hollow slab beam and the widened hollow slab beam, respectively.

2. The bridge widening structure for new and old hollow slab bridges according to claim 1, characterized in that, The number of transverse steel reinforcement assemblies in the splicing segment is two layers, and the two layers of transverse steel reinforcement assemblies are arranged vertically at intervals to be distributed at the top and bottom of the splicing segment respectively.

3. The bridge widening structure for new and old hollow slab bridges according to claim 2, characterized in that, The longitudinal connection assembly includes a first rebar assembly, a second rebar assembly, and a connector. The two ends of the first rebar assembly are respectively embedded in the existing hollow slab beam and the splice section. The two ends of the second rebar assembly are respectively embedded in the widened hollow slab beam and the splice section. The first rebar assembly and the second rebar assembly are connected by the connector.

4. The method for widening old and new hollow slab bridges according to claim 3, characterized in that, The longitudinal connecting component is positioned close to the transverse reinforcing bar component below it.

5. The bridge widening structure for new and old hollow slab bridges according to claim 3, characterized in that, The end of the second rebar assembly extending into the widened hollow slab beam is bent.

6. The method for widening old and new hollow slab bridges according to claim 1, characterized in that, The top of the wet joint structure is flush with the top of the existing hollow slab beam and the widened hollow slab beam.

7. The bridge widening structure for new and old hollow slab bridges according to claim 1, characterized in that, The longitudinal length of the existing section is greater than the longitudinal length of the widened section.

8. The bridge widening structure for new and old hollow slab bridges according to claim 3, characterized in that, The connector includes a plurality of longitudinally spaced short connecting bars, which connect the first rebar assembly and the second rebar assembly.

9. The bridge widening structure for new and old hollow slab bridges according to claim 2, characterized in that, The steel reinforcement assembly also includes a stirrup assembly, which is attached to the outside of the two layers of transverse steel reinforcement assemblies of the splice segment.

10. The bridge widening structure for new and old hollow slab bridges according to claim 1, characterized in that, It also includes a bridge deck pavement section, which is laid on top of the existing hollow slab beam, the wet joint structure, and the widened hollow slab beam.

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