Pavement seal structure and construction method

Abstract

The application relates to the field of asphalt pavements, and particularly discloses a pavement seal layer structure and a construction method. The pavement seal layer structure comprises, from top to bottom, an SMA thin-layer surface cover, a geogrid and a stress absorption layer, the stress absorption layer comprises SBS modified emulsified asphalt and glass fibers; the geogrid comprises a plurality of transverse grid bars and a plurality of longitudinal grid bars, the longitudinal grid bars are arranged on the lower side of the transverse grid bars, connecting pieces are arranged at the intersection connection positions of the transverse grid bars and the longitudinal grid bars, the transverse grid bars are internally provided with transverse steel bars, the transverse steel bars are connected with a plurality of fastening steel bars which pass through the transverse grid bars at intervals, the longitudinal grid bars are provided with through holes for the fastening steel bars to pass through, the longitudinal grid bars are internally provided with two longitudinal steel bars, and the through holes are arranged between the two longitudinal steel bars. The application combines the advantages of the SMA thin-layer surface cover, the geogrid and the stress absorption layer, the interlayer bonding performance is excellent, the pavement performance is improved, and the service life of the road is prolonged.

Description

Technical Field

[0001] This application relates to the field of asphalt pavement, and in particular to a pavement seal structure and construction method. Background Technology

[0002] Asphalt pavements, exposed to the natural environment for extended periods and subjected to repeated vehicle loads, are prone to aging and cracking, affecting their performance and necessitating timely repair. Road sealant primarily protects the pavement from moisture erosion and tire wear. It can also be used to repair old asphalt pavements, improving their wear resistance, skid resistance, and smoothness, thereby extending their service life.

[0003] In related technologies, road seal is made of asphalt concrete. When applied to the surface layer of old asphalt pavement, it is prone to insufficient interlayer bonding between the old and new pavement, which affects the overall performance of the pavement structure and needs to be improved. Summary of the Invention

[0004] To improve interlayer bonding performance, this application provides a road seal structure and construction method.

[0005] Firstly, the road seal structure provided in this application adopts the following technical solution:

[0006] A road seal structure includes, from top to bottom, an SMA thin overlay, a geogrid, and a stress-absorbing layer, wherein the stress-absorbing layer comprises SBS modified emulsified asphalt and glass fiber;

[0007] The geogrid includes multiple transverse bars and multiple longitudinal bars. The longitudinal bars are located below the transverse bars. Connectors are provided at the intersections of the transverse and longitudinal bars. Transverse reinforcing bars are provided inside the transverse bars. Multiple fastening reinforcing bars are connected at intervals through the transverse bars. The longitudinal bars are provided with through holes for the fastening reinforcing bars to pass through. Two longitudinal reinforcing bars are provided inside the longitudinal bars. The through holes are located between the two longitudinal reinforcing bars.

[0008] By adopting the above technical solution, a composite structure of SMA thin-layer overlay, geogrid, and stress-absorbing layer is used as the pavement seal layer, which is suitable for repairing old asphalt pavements. Specifically, the SMA thin-layer overlay improves the pavement's skid resistance and smoothness, restoring its serviceability and reducing worn thickness; the geogrid increases the pavement's load-bearing capacity and reduces crack formation; and the stress-absorbing layer primarily serves a waterproofing and bonding function, enhancing the interlayer bond between new and old pavements.

[0009] This application combines the advantages of these three factors to comprehensively improve road surface performance, thereby extending the service life of the road, increasing the overall benefits of the road surface, and ensuring that the road surface function is fully utilized.

[0010] In addition, the geogrid has been optimized with added reinforcing bars. During the paving and compaction of the SMA thin overlay, the reinforcing bars are compressed and embedded into the pores of the old asphalt pavement, thereby improving the geogrid's grip relative to the old asphalt pavement, further enhancing the seal strength and interlayer bonding performance, making the seal layer less prone to cracking.

[0011] Optionally, the connector includes a connecting seat disposed between the transverse grid bars and the longitudinal grid bars, an upper cover plate disposed on the side of the transverse grid bars opposite to the connecting seat, and a lower cover plate disposed on the side of the longitudinal grid bars opposite to the connecting seat. Both the upper cover plate and the lower cover plate are connected to the connecting seat, and both the connecting seat and the lower cover plate are provided with through holes for fastening reinforcing bars to pass through.

[0012] By adopting the above technical solution, after placing the horizontal and vertical grid bars into the connecting seat, and then installing the upper and lower cover plates, the relative fixation of the horizontal and vertical grid bars can be completed. Compared with welding, the process is more convenient and reliable.

[0013] Optionally, the upper cover plate and the lower cover plate are each fixedly connected to a post on opposite sides, the connecting seat is provided with a slot that is interference fit with the post, and the upper cover plate and the lower cover plate are each provided with an anti-slip pad on opposite sides, the anti-slip pad pressing against the transverse grid or the longitudinal grid.

[0014] By adopting the above technical solution, the upper and lower cover plates can be fixed relative to the connecting seat by inserting the insert into the slot, making installation convenient.

[0015] Optionally, the anti-slip mat is made of rubber.

[0016] By adopting the above technical solution, the anti-slip mat can increase the contact friction. In addition, a lot of heat is generated during the paving of the SMA thin-layer cover, and the surface of the anti-slip mat partially melts and adheres to the surface of the transverse and longitudinal grids, thereby improving the fastening effect.

[0017] Optionally, the connecting seat includes two side seats, a connecting pad connected to one side of the two side seats facing each other, and a connecting rod connected between the two connecting pads. The connecting rod is provided in two parts and is distributed in a cross pattern.

[0018] By adopting the above technical solution, during the SMA thin-layer overlay paving and compaction process, the connecting rod breaks after the connector is compressed, causing the two connecting pads to move closer to each other, which in turn causes the fastening steel bars to pass through the connector and penetrate into the pores of the old asphalt pavement.

[0019] Optionally, the side seat is made of PTFE material, and the connecting pad and connecting rod are made of LDPE material.

[0020] By adopting the above technical solution, the paving temperature of SMA thin-layer overlay is generally not lower than 150℃. Under the action of high temperature, the connecting pad and connecting rod will melt, while the side seat can withstand the high temperature. After cooling, the two connecting pads and connecting rods are connected as one, thus avoiding the trouble of the tensile strength of the geogrid decreasing due to the breakage of the connecting rod.

[0021] Optionally, the connecting pad is provided with a groove facing the connecting rod.

[0022] By adopting the above technical solution, space is provided to accommodate the connecting rod after it breaks, so that the connecting rod and the connecting pad can be fused together.

[0023] Optionally, the fastening reinforcement includes a V-shaped segment and connecting segments connected to both ends of the V-shaped segment, and the two connecting segments are twisted together to form a double helix after passing around the transverse reinforcement.

[0024] By adopting the above technical solution, it is easy to assemble the fastening steel bars and transverse steel bars together.

[0025] Secondly, the construction method for a road seal layer structure provided in this application adopts the following technical solution:

[0026] A construction method for a road seal layer structure includes the following steps:

[0027] The first step is to clean the surface of the old asphalt pavement, then spray the first layer of SBS modified emulsified asphalt, followed by the application of glass fiber, and then spray the second layer of SBS modified emulsified asphalt. The spraying rate for each layer of SBS modified emulsified asphalt is 1.0-1.5 kg / m². 2 The fiberglass application rate is 80-150 g / m². 2 This forms a stress-absorbing layer;

[0028] The second step is to lay the geogrid on the upper side of the stress-absorbing layer;

[0029] The third step is to lay the SMA asphalt mixture on the top of the geogrid and repeatedly compact it to form a thin SMA overlay.

[0030] Optionally, the thickness of the stress-absorbing layer is 1 mm, and the thickness of the SMA thin-film cover is 25 mm.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. This application combines the advantages of SMA thin-layer overlay, geogrid and stress-absorbing layer to improve the anti-skid performance and smoothness of the pavement, increase the bearing capacity of the pavement, reduce the generation of pavement cracks, enhance the interlayer bonding performance of new and old pavement, restore the service performance and worn thickness of the pavement, thereby extending the service life of the road, improving the overall benefits of the pavement, and ensuring that the pavement function can be fully utilized.

[0033] 2. The connection components facilitate the assembly of transverse and longitudinal grid bars, and also facilitate the insertion of reinforcing bars into the pores of the old road surface during the compaction of the SMA thin-layer overlay, thereby improving road performance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the road seal structure according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of the geogrid according to an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the horizontal grid strip in an embodiment of this application;

[0037] Figure 4 This is a structural schematic diagram of the transverse reinforcing bars and fastening reinforcing bars in an embodiment of this application;

[0038] Figure 5 This is a front view schematic diagram of a geogrid according to an embodiment of this application;

[0039] Figure 6 This is a schematic diagram of the structure of the longitudinal grid strip in an embodiment of this application;

[0040] Figure 7 This is an exploded view of the connector according to an embodiment of this application;

[0041] Figure 8 This is a cross-sectional schematic diagram of the connecting pad according to an embodiment of this application.

[0042] Explanation of reference numerals in the attached drawings: 1. SMA thin-layer cover; 2. Geogrid; 21. Horizontal grid bar; 22. Longitudinal grid bar; 221. Through hole; 23. Connector; 231. Connecting seat; 2311. Slot; 2312. Side seat; 2313. Connecting pad; 2314. Connecting rod; 232. Top cover plate; 233. Bottom cover plate; 234. Inserted post; 235. Anti-slip pad; 24. Horizontal reinforcement; 25. Fastening reinforcement; 251. V-shaped section; 252. Connecting section; 26. Longitudinal reinforcement; 3. Stress-absorbing layer; 4. Groove; 5. Perforation. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0044] This application discloses a road seal structure and construction method.

[0045] Reference Figure 1The pavement sealing structure comprises, from top to bottom, an SMA thin overlay 1, a geogrid 2, and a stress-absorbing layer 3. The SMA thin overlay 1 is constructed from asphalt mastic aggregate, the geogrid 2 is made of steel-plastic composite, and the stress-absorbing layer 3 is sprayed with SBS modified emulsified asphalt and glass fiber. The SMA thin overlay 1 improves the pavement's skid resistance and smoothness, restoring its serviceability and reducing wear. The geogrid 2 increases the pavement's load-bearing capacity and reduces crack formation. The stress-absorbing layer 3 primarily serves a waterproofing and bonding function, enhancing the interlayer bond between new and old pavements.

[0046] Reference Figure 2 The geogrid 2 includes multiple equally spaced transverse grid bars 21, multiple equally spaced longitudinal grid bars 22, and connectors 23 for connecting the transverse grid bars 21 and the longitudinal grid bars 22. The transverse grid bars 21 and the longitudinal grid bars 22 are intersecting and perpendicular to each other. The connectors 23 are located at the intersection of the transverse grid bars 21 and the longitudinal grid bars 22, and the longitudinal grid bars 22 are located below the transverse grid bars 21.

[0047] Reference Figure 3 , Figure 4 The transverse grid strip 21 is made of PTFE and contains a transverse reinforcing bar 24, which enhances its transverse tensile strength. A fastening reinforcing bar 25 is connected to the transverse reinforcing bar 24 at a position corresponding to the longitudinal grid strip 22. The fastening reinforcing bar 25 increases the grip of the geogrid 2. The fastening reinforcing bar 25 includes a V-shaped section 251 and connecting sections 252 integrally formed at both ends of the upper side of the V-shaped section 251. The lower end of the V-shaped section 251 extends through the transverse grid strip 21. The two connecting sections 252 are wound from the upper side to the lower side of the transverse reinforcing bar 24 and then twisted together to form a double helix. The double helix portion of the two connecting sections 252 extends out of the transverse grid strip 21. The fastening reinforcing bar 25 holds the transverse reinforcing bar 24 tightly, preventing positional displacement and facilitating the extrusion injection molding of the transverse grid strip 21.

[0048] Reference Figure 5 , Figure 6 The longitudinal grid 22 is made of PTFE and has two longitudinal steel bars 26 inside, which can enhance the longitudinal tensile strength of the longitudinal grid 22. The longitudinal grid 22 has multiple through holes 221 at intervals, through holes 221 for fastening steel bars 25 to pass through, and the through holes 221 are located between two longitudinal steel bars 26.

[0049] Reference Figure 5 , Figure 7The connector 23 includes a connector 231, an upper cover plate 232 and a lower cover plate 233 respectively connected to the upper and lower sides of the connector 231. The connector 231 is disposed between the transverse grid 21 and the longitudinal grid 22. The upper cover plate 232 is disposed on the side of the transverse grid 21 opposite to the connector 231 to limit the transverse grid 21. The lower cover plate 233 is disposed on the side of the longitudinal grid 22 opposite to the connector 231 to limit the longitudinal grid 22.

[0050] Reference Figure 5 The connecting seat 231 includes two side seats 2312, connecting pads 2313 fixedly connected to the opposite sides of the two side seats 2312, and a connecting rod 2314 fixedly connected between the two connecting pads 2313. Each of the opposite sides of the two side seats 2312 has a receiving groove for inserting a transverse grid bar 21 or a longitudinal grid bar 22. A pin 234 is fixedly connected to the opposite sides of the upper cover plate 232 and the lower cover plate 233. The connecting seat 231 has a slot 2311 that is interference-fitted with the pin 234. An anti-slip pad 235, made of rubber, is fixedly connected to the opposite sides of the upper cover plate 232 and the lower cover plate 233, and the anti-slip pad 235 presses against the transverse grid bar 21 or the longitudinal grid bar 22.

[0051] Reference Figure 5 The connecting seat 231, the lower cover plate 233, and the anti-slip pad 235 located on the lower side are all provided with through holes 5 for fastening the reinforcing bars 25 to pass through. There are two connecting rods 2314, which are distributed in a crisscross pattern. The side seat 2312, the upper cover plate 232, and the lower cover plate 233 are all made of PTFE material, which can withstand a paving temperature of 160℃ without easily melting and maintaining strength. The connecting pad 2313 and the connecting rod 2314 are made of LDPE material, which easily melts at a paving temperature of 160℃.

[0052] During the paving of the SMA thin-layer overlay 1, the connecting rod 2314 is prone to breakage under the weight of the roller, causing the two connecting pads 2313 to move closer together. This causes the transverse grid 21 to move down closer to the longitudinal grid 22, making it easier for the lower end of the fastening steel bar 25 to pass through the lower surface of the connector 23, thus facilitating the fastening steel bar 25 to penetrate into the pores of the old asphalt pavement. At the same time, the connector 23 is subjected to high temperature, causing the connecting pads 2313 and connecting rods 2314 to melt. After paving is completed, with natural cooling, the connecting pads 2313 and connecting rods 2314 re-solidify and become a single unit.

[0053] It should be noted that during the laying of geogrid 2, the connecting rod 2314 is not broken, and the lower end of the fastening steel bar 25 is exactly inside the through hole 5 of the lower cover plate 233. Therefore, when the SMA thin overlay 1 is laid, the fastening steel bar 25 can immediately pass through the lower end of the connecting member 23. In addition, the fastening steel bar 25 is not entirely aligned with the pores of the old asphalt pavement, but this does not affect its use.

[0054] Reference Figure 5 , Figure 8 The connecting pad 2313 is provided with a groove 4 directly opposite the connecting rod 2314, providing space for the connecting rod 2314 to be accommodated after it breaks, so that the connecting rod 2314 and the connecting pad 2313 can be fused together.

[0055] The implementation principle of the geogrid 2 in this application embodiment is as follows:

[0056] During the paving and compaction of the SMA thin overlay 1, the reinforcing steel bars 25 are pressed and embedded into the pores of the old asphalt pavement, thereby improving the grip of the geogrid 2 relative to the old asphalt pavement, further improving the seal strength and interlayer bonding performance, making the seal layer less prone to cracking.

[0057] A construction method for a road seal layer structure includes the following steps:

[0058] The first step is to clean the surface layer of the old asphalt road, then spray the first layer of SBS modified emulsified asphalt, then spray glass fiber, and then spray the second layer of SBS modified emulsified asphalt. The spraying amount of each layer of SBS modified emulsified asphalt is 1.0-1.5 kg / m2, and the spraying amount of glass fiber is 80-150 g / m2, forming a stress-absorbing layer 3 with a thickness of 1 mm.

[0059] The second step is to lay the geogrid 2 on the upper side of the stress-absorbing layer 3;

[0060] The third step is to lay the SMA asphalt mixture on the upper side of the geogrid 2 and repeatedly roll it to form a 25mm thick SMA thin overlay 1.

[0061] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A road seal structure, characterized in that: It includes an SMA thin-layer overlay (1), a geogrid (2) and a stress-absorbing layer (3) arranged from top to bottom, wherein the stress-absorbing layer (3) includes SBS modified emulsified asphalt and glass fiber; The geogrid (2) includes multiple transverse grid bars (21) and multiple longitudinal grid bars (22). The longitudinal grid bars (22) are located below the transverse grid bars (21). A connector (23) is provided at the intersection of the transverse grid bars (21) and the longitudinal grid bars (22). Transverse steel bars (24) are provided inside the transverse grid bars (21). Multiple fastening steel bars (25) are connected at intervals to the transverse grid bars (21). The longitudinal grid bars (22) are provided with through holes (221) for the fastening steel bars (25) to pass through. Two longitudinal steel bars (26) are provided inside the longitudinal grid bars (22). The through holes (221) are located between the two longitudinal steel bars (26). The connector (23) includes a connecting seat (231) provided between the transverse grid bars (21) and the longitudinal grid bars (22), and a connecting seat (231) provided between the transverse grid bars (21) and the longitudinal grid bars (22). An upper cover plate (232) is provided on the side of the grid bar (21) away from the connecting seat (231), and a lower cover plate (233) is provided on the side of the longitudinal grid bar (22) away from the connecting seat (231). The upper cover plate (232) and the lower cover plate (233) are both connected to the connecting seat (231). The connecting seat (231) and the lower cover plate (233) are both provided with through holes (5) for fastening the reinforcing bars (25) to pass through. The connecting seat (231) includes two side seats (2312), a connecting pad (2313) connected to the opposite side of the two side seats (2312), and a connecting rod (2314) connected between the two connecting pads (2313). There are two connecting rods (2314) and they are distributed in a cross pattern. The side seats (2312) are made of PTFE material, and the connecting pads (2313) and the connecting rods (2314) are made of LDPE material.

2. The road seal structure according to claim 1, characterized in that: The upper cover plate (232) and the lower cover plate (233) are both fixedly connected to the opposite side of the insert post (234). The connecting seat (231) is provided with a slot (2311) that is interference fit with the insert post (234). The upper cover plate (232) and the lower cover plate (233) are both provided with anti-slip pads (235) on the opposite side of the upper cover plate (232) and the anti-slip pads (235) abut against the transverse grid strip (21) or the longitudinal grid strip (22).

3. The road seal structure according to claim 2, characterized in that: The anti-slip mat (235) is made of rubber.

4. The road seal structure according to claim 1, characterized in that: The connecting pad (2313) is provided with a groove (4) opposite to the connecting rod (2314).

5. The road seal structure according to claim 1, characterized in that: The fastening steel bar (25) includes a V-shaped segment (251) and a connecting segment (252) connected to both ends of the V-shaped segment (251). The two connecting segments (252) are twisted together to form a double helix after passing around the transverse steel bar (24).

6. A construction method for a road seal layer structure according to any one of claims 1 to 5, characterized in that, Includes the following steps: The first step is to clean the surface layer of the old asphalt road, then spray the first layer of SBS modified emulsified asphalt, then spray glass fiber, and then spray the second layer of SBS modified emulsified asphalt. The spraying amount of each layer of SBS modified emulsified asphalt is 1.0-1.5 kg / m2, and the spraying amount of glass fiber is 80-150 g / m2, forming a stress absorption layer (3). The second step is to lay the geogrid (2) on the upper side of the stress-absorbing layer (3); The third step is to lay the SMA asphalt mixture on the upper side of the geogrid (2) and repeatedly roll it to form a thin SMA overlay (1).

7. The construction method of the road seal layer structure according to claim 6, characterized in that: The stress-absorbing layer (3) has a thickness of 1 mm, and the SMA thin-layer cover (1) has a thickness of 25 mm.

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