An elevated monoswivel joint pavement structure

Abstract

This utility model discloses an elevated single expansion joint pavement structure, including an inverted T-shaped cap beam, multiple small box girders on both sides of the cap beam, a bridge deck support device, and a sealing plate. Multiple beam joints are formed between the small box girders and the inverted T-shaped cap beam. The bridge deck support device is mounted on the inverted T-shaped cap beam and includes alternating support structures and a bridge deck expansion joint structure. The projection of the bridge deck expansion joint structure in the longitudinal direction of the bridge deck is staggered with the beam joints, so that each expansion joint corresponds to the bridge deck area between adjacent beam joints. The sealing plate covers the beam joint to seal its upper end. This utility model, by placing the expansion joint in the mid-span stable region, achieves deformation function decoupling and optimizes the number of expansion joints, significantly improving driving stability, structural durability, and overall life-cycle economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, and in particular to an elevated single expansion joint pavement structure. Background Technology

[0002] As a core component of modern transportation infrastructure, the smoothness of driving, structural durability, and economic efficiency throughout the entire life cycle of elevated bridges are of paramount importance. In existing technologies, to achieve bridge deck continuity and adapt to temperature changes, the common practice is to install bridge deck expansion joints above the piers or cap beam supports. This has led to a long-standing technical dilemma: the structural gaps between the bridge deck expansion joints and the underlying beams—the beam joints—often coincide spatially.

[0003] This overlapping location means the structure must simultaneously cope with two main types of complex deformation: beam end rotation caused by vehicle loads and longitudinal expansion and contraction of the bridge deck due to changes in ambient temperature. The superposition of these deformations results in the expansion joints and supporting structures in this area being under a complex alternating stress state for extended periods, making them highly susceptible to early fatigue damage to the expansion joint components. These problems directly manifest as bridge approach slumping when vehicles pass, generating impact loads and affecting driving stability and comfort.

[0004] Meanwhile, to ensure effective release of temperature stress, traditional designs often require numerous expansion joints on the bridge deck. Each expansion joint is a potential weak point and maintenance point, which not only increases the initial construction cost of the bridge but also significantly increases the frequency and cost of subsequent maintenance due to its vulnerability, placing a long-term burden on operation and management.

[0005] Therefore, there is an urgent need in this field for an innovative structural system that can solve a series of problems caused by the excessive number of expansion joints in traditional designs, thereby achieving a comprehensive improvement in driving comfort, structural durability and engineering economy. Summary of the Invention

[0006] This application provides an elevated single expansion joint pavement structure. By placing the expansion joint in the mid-span stable region, the structural deformation function is decoupled and the number of expansion joints is optimized, thereby simultaneously improving driving stability, structural durability, and life-cycle economy.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an elevated single expansion joint pavement structure, comprising: Inverted T-shaped cap beam; Several small box girders are set on both sides of the inverted T-shaped cap beam along its length, and form multiple beam joints with the inverted T-shaped cap beam along its length. The bridge deck support device is erected on the inverted T-shaped cap beam. The bridge deck support device includes multiple support structures and bridge deck expansion joint structures. The support structures and bridge deck expansion joint structures are alternately connected along the length direction of the inverted T-shaped cap beam to form the bridge deck. The projection of the bridge deck expansion joint structure in the longitudinal direction of the bridge deck is staggered with the beam joint in the length direction, so that each bridge deck expansion joint structure corresponds to the bridge deck area between adjacent beam joints. A sealing plate is placed between the beam joint and the bridge deck support device, and covers the top of the beam joint to seal the upper end of the beam joint.

[0008] Compared with the prior art, the advantages of this utility model are: By spatially staggering the bridge deck expansion joints with the underlying beam joints, the traditional continuous bridge deck system is optimized. Placing the expansion joints in more stable areas between adjacent beam joints allows a single expansion joint to serve a longer continuous section of the bridge deck, significantly reducing the total number of expansion joints across the entire bridge while effectively releasing temperature stress. This reduction in the number of expansion joints directly lowers the construction and long-term maintenance costs of the bridge. Secondly, since expansion joints are weak points in the bridge deck, their reduction means fewer potential problem areas. This not only improves the continuity and smoothness of driving on the bridge deck, further enhancing driving comfort, but also effectively improves the overall stiffness and durability of the bridge deck structure. Simultaneously, this structure achieves a clear division of the bridge's deformation functions, allowing beam end rotation and longitudinal expansion and contraction of the bridge deck to occur at two different locations, avoiding complex stress superposition and making the structural stress distribution more rational. The sealing plates covering the beam joints effectively protect the substructure. Furthermore, the sealing plate covering the upper end of the beam joint reliably sealed the upper end of the beam joint during the in-situ construction of the bridge deck, preventing concrete slurry from flowing into the beam joint and avoiding a series of problems such as obstructed beam end rotation, jamming of expansion joints, and blockage of drainage channels, thus ensuring the normal realization of the bridge's deformation function. Through the collaborative design of functional decoupling and quantity optimization, this structure has achieved significant technological progress in terms of driving comfort, structural durability, life-cycle economy, and ease of maintenance.

[0009] As an improvement, the sealing plate has horizontally extending reinforcing sections integrally formed on both sides to enhance its rigidity and sealing performance. By integrally forming these horizontal reinforcing sections on both sides, the structural rigidity of the plate is significantly enhanced, enabling it to effectively resist bending deformation under load, thereby maintaining shape stability. This improves the contact tightness and durability between the sealing plate and adjacent components, ensuring the reliability of the sealing effect at the upper end of the beam joint. At the same time, the presence of the reinforcing sections expands the coverage and drainage area of ​​the sealing plate, further preventing the intrusion of moisture and debris, thus comprehensively improving the protection capability for the substructure and the overall sealing performance.

[0010] As an improvement, the sealing plate is connected to the inverted T-shaped cap beam through multiple spaced connectors. The upper end of the connector is embedded in the sealing plate to achieve a flat seal, so that the connector will not form protrusions or gaps on the surface of the sealing plate. This ensures the continuous flatness of the upper surface of the sealing plate during the fastening process and after long-term use, eliminating the path of water seepage or mud that may be caused by exposed connectors. This achieves a complete, continuous and durable seal on the upper end of the beam joint, effectively improving the reliability and durability of the overall sealing system.

[0011] As an improvement, the support structure includes a support platform and a support frame arranged from top to bottom. The bridge deck expansion joint structure includes two sets of interlocking expansion combs. Each expansion comb has a fixed end and a free end. The fixed end is fixedly connected to the mounting end of the support frame, and the free end interlocks with the free ends of adjacent expansion combs. This allows vehicle loads to be effectively transferred to the support frame and substructure through the expansion combs, ensuring reliable structural support. At the same time, the interlocking free ends can smoothly slide relative to each other on the support platform, freely adapting to the longitudinal expansion and contraction deformation of the bridge deck caused by temperature changes, ensuring the smoothness of expansion and contraction activities, thereby significantly improving the ride comfort and long-term service durability of the expansion joint area.

[0012] As an improvement, guardrail devices are vertically installed on both sides of the bridge deck support device. The guardrail device includes several anti-collision walls spaced apart along the length direction and deformation compensation bodies connecting adjacent anti-collision walls. The deformation compensation bodies are aligned with the expansion joint structure, so that the guardrail device and the bridge deck support device deform in tandem at corresponding positions. By aligning the deformation compensation bodies with the bridge deck expansion joint structure, the guardrail device ensures that the guardrail and the main bridge deck structure deform in the same coordinated manner at the same position when the temperature changes. This effectively avoids mutual constraints and additional stress caused by uncoordinated deformation between the two, and prevents stress concentration inside the structure and its potential cracking or damage. This not only ensures the safety and durability of the guardrail itself, but also ensures the continuous smoothness of traffic obstacles by maintaining synchronization with the bridge deck deformation, thereby further improving the overall safety performance and service life of the viaduct.

[0013] As an improvement, the deformation compensation body includes an expansion joint disposed between adjacent crash barriers and two fixing groups disposed at the upper and lower connecting ends of the expansion joint. The fixing groups include fixing parts disposed at the front and rear sides of the expansion joint. The crash barriers are connected to the expansion joint through the fixing parts. By setting up a dedicated expansion joint and fixing parts disposed at the front and rear ends of the expansion joint, an organic combination of deformation absorption and reliable connection is achieved. The expansion joint can effectively adapt to and absorb the longitudinal expansion and contraction deformation of the guardrail caused by temperature changes.

[0014] As an improvement, the outer side of the crash barrier is covered with a cover plate. The cover plate is fixedly connected to the fixing part and the crash barrier by screws arranged in an array around the cover plate. Multiple sealing parts are arranged along the inner side of the crash barrier and the cover plate, which are pressed and sealed by the cover plate. The lowermost sealing part forms a flow channel with the bridge deck support system to guide water to the drainage channel. The water inlet of the flow channel is located on the side of the cover plate corresponding to the support platform. The multiple sealing parts arranged on the inner side of the fixing part form a reliable multi-layer waterproof barrier under the pressure of the cover plate, which can effectively prevent water from penetrating the internal connectors and the wall. At the same time, the flow channel formed between the lowermost sealing part and the bridge deck support device can actively collect any small amount of water that may seep in from the water inlet on the side of the fixing part and orderly guide it to the drainage channel, thereby avoiding water accumulation and erosion of the structure, and significantly improving the durability and long-term service performance of the guardrail system and the adjacent bridge deck structure. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the cross-section of an elevated single expansion joint pavement structure. Figure 2 This is a schematic diagram of the sealing plate structure; Figure 3 This is a top view of the bridge deck expansion joint structure; Figure 4 This is a schematic diagram of the guardrail device structure; Figure 5 This is a schematic diagram of the deformation compensation structure; Figure 6 This is a schematic diagram of the cross-sectional structure of the crash barrier. Figure 7 This is an enlarged structural diagram of section A of the crash barrier; Figure 8 This is a schematic diagram of the drainage channel.

[0016] The markings in the above figures are as follows: 1. Inverted T-shaped cap beam; 2. Small box girder; 3. Beam joint; 4. Bridge deck support device; 4.1. Support structure; 4.1.1. Support platform; 4.1.2. Support frame; 4.2. Bridge deck expansion joint structure; 4.2.1. Fixed end; 4.2.2. Free end; 5. Sealing plate; 5.1. Lateral reinforcement; 6. Connecting parts; 7. Guardrail device; 7.1. Crash barrier; 7.2. Deformation compensation body; 7.2.1. Expansion joint; 7.2.2. Fixed part; 8. Screw; 9. Cover plate; 10. Sealing part; 11. Diversion channel; 12. Drainage channel. Detailed Implementation

[0017] In this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "planar direction", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] like Figure 1 As shown, an elevated single expansion joint pavement structure includes an inverted T-shaped cap beam 1, several small box girders 2, a bridge deck support device 4, and a sealing plate 5. The small box girders 2 are located on both sides of the inverted T-shaped cap beam 1 along its length, forming multiple beam joints 3 with the inverted T-shaped cap beam 1 along its length. The bridge deck support device 4 is erected on the inverted T-shaped cap beam 1 and includes multiple support structures 4.1 and bridge deck expansion joint structures 4.2. The support structures 4.1 and the bridge deck expansion joint structures 4.2 intersect along the length of the inverted T-shaped cap beam 1. The bridge deck is formed by connecting the bridge deck expansion joint structure 4.2. The projection of the bridge deck expansion joint structure 4.2 in the longitudinal direction of the bridge deck is staggered with the beam joint 3 in the length direction, so that each bridge deck expansion joint structure 4.2 corresponds to the bridge deck area between adjacent beam joints 3. The sealing plate 5 is set between the beam joint 3 and the bridge deck support device 4, and covers the beam joint 3 to seal the upper end of the beam joint 3. Preferably, the support structure 4.1 includes cast-in-place concrete and steel frame, and the bridge deck expansion joint structure 4.2 is set in the groove formed or reserved in the bridge deck concrete.

[0019] like Figure 2 As shown, the sealing plate 5 has horizontally extending reinforcing parts 5.1 integrally formed on both sides to improve the rigidity and sealing performance of the sealing plate 5.

[0020] The sealing plate 5 is connected to the inverted T-shaped cover beam 1 by multiple spaced connectors 6. The upper end of the connectors 6 is embedded in the sealing plate 5 to achieve a flat seal.

[0021] like Figure 3 As shown, the support structure 4.1 includes a support platform 4.1.1 and a support frame 4.1.2 arranged from top to bottom. The bridge deck expansion joint structure 4.2 includes two sets of interlocking expansion combs. Each expansion comb includes a fixed end 4.2.1 and a free end 4.2.2. The fixed end 4.2.1 is fixedly connected to the mounting end of the support frame 4.1.2, and the free end 4.2.2 is interlocked with the free end 4.2.2 of the adjacent expansion comb.

[0022] like Figure 4As shown, guardrail devices 7 are vertically installed on both sides of the bridge deck support device 4. The guardrail device 7 includes several anti-collision walls 7.1 spaced apart along the length direction and deformation compensation bodies 7.2 connected between adjacent anti-collision walls 7.1. The deformation compensation bodies 7.2 are aligned with the expansion joint structure so that the guardrail device 7 and the bridge deck support device 4 deform together at corresponding positions.

[0023] like Figure 5 As shown, the deformation compensation body 7.2 includes a telescopic part 7.2.1 disposed between adjacent anti-collision walls 7.1, and two fixing groups disposed at the upper and lower connecting ends of the telescopic part 7.2.1 respectively. The fixing groups include fixing parts 7.2.2 disposed on the front and rear sides of the telescopic part 7.2.1 respectively. The anti-collision wall 7.1 is connected to the telescopic part 7.2.1 through the fixing parts 7.2.2.

[0024] like Figures 6 to 8 As shown, the outer side of the crash barrier 7.1 is covered with a cover plate 9. The cover plate 9 is fixedly connected to the fixing part 7.2.2 and the crash barrier 7.1 by screws 8 arranged in an array around the cover plate 9. Multiple sealing parts 10 are provided along the inner side of the crash barrier 7.1 and the cover plate 9, which are pressed and sealed by the cover plate 9. The lowermost sealing part 10 forms a guide channel 11 between itself and the bridge deck support system to guide water to the drainage channel 12. The water inlet of the guide channel 11 is located on the side of the cover plate 9 corresponding to the support platform 4.1.1.

[0025] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A single expansion joint pavement structure for elevated roads, characterized in that, include: Inverted T-shaped cap beam (1); Several small box beams (2) are respectively located on both sides of the inverted T-shaped cover beam (1) along its length direction, and form multiple beam joints (3) with the inverted T-shaped cover beam (1) along its length direction; A bridge deck support device (4) is erected on the inverted T-shaped cap beam (1). The bridge deck support device (4) includes multiple support structures (4.1) and bridge deck expansion joint structures (4.2). The support structures (4.1) and bridge deck expansion joint structures (4.2) are alternately connected along the length direction of the inverted T-shaped cap beam (1) to form the bridge deck. The projection of the bridge deck expansion joint structure (4.2) in the longitudinal direction of the bridge deck is staggered with the beam joint (3) in the length direction, so that each bridge deck expansion joint structure (4.2) corresponds to the bridge deck area between adjacent beam joints (3). A sealing plate (5) is disposed between the beam joint (3) and the bridge deck support device (4) and covers the upper part of the beam joint (3) to seal the upper end of the beam joint (3).

2. The elevated single expansion joint pavement structure according to claim 1, characterized in that, The sealing plate (5) has horizontally reinforcing parts (5.1) integrally formed on both sides to improve the rigidity and sealing performance of the sealing plate (5).

3. The elevated single expansion joint pavement structure according to claim 1, characterized in that, The sealing plate (5) is connected to the inverted T-shaped cover beam (1) by multiple spaced connectors (6), the upper ends of which are embedded in the sealing plate (5) to achieve a flat seal.

4. The elevated single expansion joint pavement structure according to claim 1, characterized in that, The support structure (4.1) includes a support platform (4.1.1) and a support frame (4.1.2) arranged from top to bottom. The bridge deck expansion joint structure (4.2) includes two sets of interlocking expansion combs. Each expansion comb includes a fixed end (4.2.1) and a free end (4.2.2). The fixed end (4.2.1) is fixedly connected to the mounting end of the support frame (4.1.2). The free end (4.2.2) is interlocked with the free end (4.2.2) of the adjacent expansion comb.

5. The elevated single expansion joint pavement structure according to claim 1, characterized in that, The bridge deck support device (4) is vertically provided with guardrail devices (7) on both sides. The guardrail device (7) includes a plurality of anti-collision walls (7.1) spaced apart along the length direction and a deformation compensation body (7.2) connected between adjacent anti-collision walls (7.1). The deformation compensation body (7.2) is aligned with the expansion joint structure so that the guardrail device (7) and the bridge deck support device (4) deform together at corresponding positions.

6. The elevated single expansion joint pavement structure according to claim 5, characterized in that, The deformation compensation body (7.2) includes a telescopic part (7.2.1) disposed between adjacent anti-collision walls (7.1) and two fixing groups disposed at the upper and lower connecting ends of the telescopic part (7.2.1). The fixing groups include fixing parts (7.2.2) disposed at the front and rear sides of the telescopic part (7.2.1). The anti-collision wall (7.1) is connected to the telescopic part (7.2.1) through the fixing parts (7.2.2).

7. The elevated single expansion joint pavement structure according to claim 6, characterized in that, The outer side of the crash barrier (7.1) is covered with a cover plate (9). The cover plate (9) is fixedly connected to the fixing part (7.2.2) and the crash barrier (7.1) by screws (8) arranged in an array around the cover plate (9). Multiple sealing parts (10) are provided along the inner side of the crash barrier (7.1) and the cover plate (9) and are pressed and sealed by the cover plate (9). The lowermost sealing part (10) forms a guide channel (11) between itself and the bridge deck support system to guide water to the drainage channel (12). The inlet of the guide channel (11) is located on the side of the cover plate (9) corresponding to the support platform (4.1.1).

Images