Urban road new and old connection structure

Abstract

The utility model relates to a new and old connecting structure of urban roads, which relates to the technical field of road construction, and comprises an old road fracture which is sequentially provided with a first step, a second step and a third step from bottom to top; the new roadbed layer is connected with the first step and the second step, and the top end of the new roadbed layer is flush with the top end of the second step; the new pavement layer is arranged at the upper part of the new roadbed layer, is connected with the third step and is flush with the third step; and the two ends of the reinforcing piece are fixedly connected into the third step and the new pavement layer correspondingly. The method has the effect that the joint of the new road and the old road is not prone to cracks.

Description

Technical Field

[0001] This application relates to the field of road construction technology, and in particular to a structure for connecting new and old urban roads. Background Technology

[0002] During road construction, the connection points between new and old roads are the key points of the entire project. The quality of this connection not only affects the aesthetics of the road, but also directly impacts the overall structural strength, driving safety, and long-term service life of the road.

[0003] As a common method for connecting new and old roads, direct splicing offers the advantage of high construction efficiency, enabling a rapid physical connection between the newly paved road surface and the existing road surface, thereby accelerating the project progress. However, this seemingly simple connection method faces numerous challenges in practical applications. Due to differences in material properties, aging levels, and construction time between new and old asphalt concrete, these differences gradually become apparent under the influence of external factors such as temperature changes and vehicle loads, causing the connection point to become a weak point of stress concentration.

[0004] Over time, cracks are likely to appear at the joints. These cracks not only affect the smoothness of the road and the comfort of driving, but also accelerate the road damage process when rainwater seeps into the cracks, resulting in poor road quality. Summary of the Invention

[0005] In order to improve the quality of road use, this application provides a new and old road connection structure.

[0006] The technical solution for the connection structure between old and new urban roads provided in this application is as follows:

[0007] A structure for connecting old and new urban roads includes:

[0008] The old road section has three steps, from bottom to top: the first step, the second step, and the third step.

[0009] The new road base layer connects the first step and the second step, and its top is flush with the top of the second step.

[0010] A new road surface layer is provided on top of the new road base layer, connecting to the third step and being flush with the third step;

[0011] The reinforcement components are fixedly connected at both ends to the third step and the new road surface layer, respectively.

[0012] By adopting the above technical solution, the stepped design of the old road section facilitates the connection with the new road. The new road base layer can provide a stable road foundation, and the new pavement layer can be well connected with the old road section. The reinforcement component can strengthen the tensile strength between the three steps and the new pavement layer. When tension occurs at the connection, the reinforcement component can bear part of the tensile force and transfer the force to both sides, making it less likely for cracks to appear at the connection between the new pavement layer and the old road section.

[0013] Optionally, the new road base layer includes, from bottom to top:

[0014] The base course is made of recycled lime, fly ash, and crushed stone.

[0015] The lower base layer is made of recycled lime, fly ash, and crushed stone, with its top flush with the first step.

[0016] The upper base layer is made of lime, fly ash, and crushed stone, with its top flush with the second step.

[0017] By adopting the above technical solution, the three-layer base layer can provide stable support, and the materials used are relatively environmentally friendly.

[0018] Optionally, the new pavement layer comprises, from bottom to top:

[0019] Oil-permeable layer, lower seal layer, coarse-grained asphalt concrete layer, tack coat, and fine-grained asphalt concrete layer.

[0020] By adopting the above technical solution, the new pavement layer has a good bonding ability with the old road section.

[0021] Optionally, the thickness ratio of the coarse-grained asphalt concrete layer to the fine-grained asphalt concrete layer is 7:4.

[0022] By adopting the above technical solutions, the thicker coarse-grained asphalt concrete layer can stably support the superstructure, while the thinner fine-grained asphalt concrete layer is less prone to cracking.

[0023] Optionally, the reinforcement includes a snap-fit ​​part embedded in the third step and a pre-embedded part pre-embedded in the coarse-grained asphalt concrete layer.

[0024] By adopting the above technical solution, the card is embedded in the third step, resulting in a greater connection strength. The pre-embedded part is pre-embedded in the coarse-grained asphalt concrete layer, which facilitates construction and ensures sufficient contact with the coarse-grained asphalt concrete layer.

[0025] Optionally, the locking part is an expansion bolt.

[0026] By adopting the above technical solution, the expansion bolt technology is mature and can be stably connected with the third step.

[0027] Optionally, the embedded part includes:

[0028] Connecting plate, connecting the snap-fit ​​part;

[0029] Two pull rods are provided, welded to the two ends of the connecting plate on the side opposite to the snap-fit ​​part;

[0030] Two limiting plates are provided and are vertically fixedly connected to the pull rod.

[0031] By adopting the above technical solution, the limiting plate can prevent the tie rod from shifting between itself and the coarse-grained asphalt concrete layer, resulting in higher connection strength; setting two sets of tie rods and limiting plates can enhance the connection strength between the embedded part and the coarse-grained asphalt concrete layer.

[0032] Optionally, the pull rod is provided with external threads, and the pre-embedded part further includes a clamping nut threadedly connected to the pull rod, with two clamping nuts on each pull rod to clamp the limiting plate.

[0033] By adopting the above technical solution, the installation of the limit plate is relatively convenient.

[0034] Optionally, a fiberglass geogrid is laid at the top of the junction between the second step and the new road base.

[0035] By adopting the above technical solutions, the crack resistance of the new pavement layer can be improved.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. Setting the old road break in a stepped shape is beneficial for the connection with the new road. The new road base can provide a stable road foundation, and the new pavement layer can be well connected with the old road break. The reinforcement can strengthen the tensile strength between the three steps and the new pavement layer. When tension occurs at the connection, the reinforcement can bear part of the tensile force and transfer the force to both sides, making it less likely for cracks to appear at the connection between the new pavement layer and the old road break.

[0038] 2. Coarse-grained asphalt concrete layers are thicker and can stably support the superstructure, while fine-grained asphalt concrete layers are thinner and less prone to cracking.

[0039] 3. The limiting plate prevents the tie rod from shifting between itself and the coarse-grained asphalt concrete layer, resulting in a higher connection strength;

[0040] 4. The installation of two sets of tie rods and limiting plates can enhance the connection strength between the embedded part and the coarse-grained asphalt concrete layer. Attached Figure Description

[0041] Figure 1 This is a cross-sectional view of the connection structure according to an embodiment of this application;

[0042] Figure 2This is a schematic diagram of the reinforcement structure according to an embodiment of this application;

[0043] Figure 3 This is an exploded view of the reinforcement component according to an embodiment of this application.

[0044] In the diagram, 1 is the broken section of the old road; 101 is the first step; 102 is the second step; and 103 is the third step.

[0045] 2. New road base course; 201. Lower base course; 202. Lower base course; 203. Upper base course;

[0046] 3. New pavement layer; 301. Permeable layer; 302. Lower seal layer; 303. Coarse-grained asphalt concrete layer; 304. Tack coat; 305. Fine-grained asphalt concrete layer;

[0047] 4. Reinforcing components; 401. Clip-in part; 402. Embedded part; 4021. Connecting plate; 4022. Tie rod; 4023. Limiting plate; 4024. Clamping nut;

[0048] 5. Fiberglass geogrid. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0050] In the description of this invention, it should be noted that the use of terms such as "upper," "lower," "inner," and "outer," indicating orientation or positional relationship, is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description. It does not 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 the invention. Furthermore, the use of terms such as "first" and "second" is also for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0052] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail below.

[0053] This application proposes a structure for connecting old and new urban roads, referring to... Figures 1 to 3 As shown, it includes the old road break 1, the new road base layer 2, the new road surface layer 3, and the reinforcement components 4.

[0054] The old road section 1 is made of asphalt concrete, and from bottom to top, it has a first step 101, a second step 102, and a third step 103. The new road base layer 2 connects the first step 101 and the second step 102, and its top is flush with the top of the second step 102. The new road surface layer 3 is set on the upper part of the new road base layer 2, connects to the third step 103, and is flush with the third step 103. The two ends of the reinforcement components 4 are fixedly connected to the third step 103 and the new road surface layer 3, and multiple components are spaced apart along the width of the road surface.

[0055] As set up above, the stepped design of the old road break 1 facilitates the connection with the new road. The new road base layer 2 provides a stable road foundation. The new pavement layer 3 can be well connected with the old road break 1. The reinforcement 4 connects the third step 103 and the new pavement layer 3, which can enhance the tensile strength between the two. When tension occurs at the connection, the reinforcement 4 can bear part of the tensile force and transfer the force to both sides, making it less likely for cracks to appear at the connection between the new pavement layer 3 and the old road break 1.

[0056] The new road base course 2 consists of, from bottom to top, a subbase 201, a lower base course 202, and an upper base course 203. The subbase 201 is made of recycled lime-fly ash crushed stone. The lower base course 202 is also made of recycled lime-fly ash crushed stone, with its top flush with the first step 101. The upper base course 203 is also made of lime-fly ash crushed stone, with its top flush with the second step 102. During construction, these three base courses are laid sequentially, providing relatively stable road support. Using recycled lime-fly ash crushed stone as raw material is also more environmentally friendly, achieving waste recycling.

[0057] In addition, the new pavement layer 3, from bottom to top, includes a permeable layer 301, a lower seal layer 302, a coarse-grained asphalt concrete layer 303, a tack coat 304, and a fine-grained asphalt concrete layer 305. The permeable layer 301 is used to bond the lower seal layer 302 and the upper base layer 203. The lower seal layer 302 serves a waterproofing and water-tight function, protecting the lower base layer from water damage. The coarse-grained asphalt concrete layer 303 mainly supports vehicles and facilitates drainage. The fine-grained asphalt concrete layer 305 primarily functions to compact and level the surface, improving pavement smoothness and vibration absorption capacity, reducing driving noise and vehicle wear. The tack coat 304 is used to bond the coarse-grained asphalt concrete layer 303 and the fine-grained asphalt concrete layer 305, ensuring a strong bond between the two layers.

[0058] Specifically, the thickness ratio of the coarse-grained asphalt concrete layer 303 to the fine-grained asphalt concrete layer 305 is 7:4. The thicker coarse-grained asphalt concrete layer 303 provides stable support for the superstructure, while the thinner fine-grained asphalt concrete layer 305 is less prone to cracking.

[0059] Regarding the specific structure of the reinforcement 4, in this embodiment, the reinforcement 4 includes a snap-fit ​​part 401 embedded in the third step 103 and a pre-embedded part 402 embedded in the coarse-grained asphalt concrete layer 303. Specifically, the snap-fit ​​part 401 is an expansion bolt, which has good connection strength. It can be installed after drilling a hole in the third step 103 during assembly, and the installation process is simple. It is easy to imagine that the snap-fit ​​part 401 can also be set as an anchor rod. After drilling a hole in the third step 103, the anchor rod needs to be installed and then mortar is poured to seal it.

[0060] In addition, the embedded part 402 in this embodiment includes a connecting plate 4021, a tie rod 4022, a limiting plate 4023, and a clamping nut 4024. The connecting plate 4021 is connected to the snap-fit ​​part 401 and is a long strip. Two tie rods 4022 are provided and welded to the two ends of the connecting plate 4021 on the side away from the snap-fit ​​part 401. Two limiting plates 4023 are rectangular plates and are vertically sleeved on the tie rods 4022. The tie rods 4022 are provided with external threads, and each tie rod 4022 is provided with two clamping nuts 4024 to clamp the limiting plate 4023. The connecting plate 4021 is pressed against the side wall of the third step 103 by the nuts on the expansion bolts. The limiting plate 4023 makes it less likely for the tie rods 4022 to shift with the coarse-grained asphalt concrete layer 303, resulting in higher connection strength. The installation of two sets of tie rods 4022 and limiting plates 4023 can enhance the connection strength between the embedded part 402 and the coarse-grained asphalt concrete layer 303.

[0061] To further enhance the crack resistance of the new pavement layer 3, a fiberglass geogrid 5 is laid at the top of the junction between the second step 102 and the new road base layer 2. The length of the fiberglass geogrid 5 is 'a', which in this embodiment is 150 cm. Half of the geogrid 5 is laid on the second step 102 and the upper base layer 203. The fiberglass geogrid 5 is a mesh structure material made primarily of alkali-free, untwisted fiberglass roving using a specific weaving process. To protect the fiberglass and improve overall performance, a special coating process is applied to form a new and superior geotextile substrate, which enhances the deformation resistance of the new pavement layer 3 at the edge of the second step 102.

[0062] This embodiment, by setting up reinforcement components 4 and fiberglass geogrid 5, can withstand stress at the junction of the new road and the old road, making the structure at the junction of the new road and the old road stronger and less prone to cracking, thus effectively improving the quality of road use.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A structure for connecting old and new urban roads, characterized in that, include: The old road section (1) has a first step (101), a second step (102) and a third step (103) from bottom to top. The new road base (2) connects the first step (101) and the second step (102), and its top is flush with the top of the second step (102); The new road surface layer (3) is set on the upper part of the new road base layer (2), connects to the third step (103) and is flush with the third step (103); The reinforcement component (4) is fixedly connected at both ends to the third step (103) and the new road surface layer (3), respectively; The new road base layer (2) includes, from bottom to top, the following: The subbase (201) is made of recycled lime, fly ash, and crushed stone. The lower base layer (202) is made of recycled lime, fly ash and crushed stone, and its top is flush with the first step (101); The upper base layer (203) is made of lime, fly ash and crushed stone, and its top is flush with the second step (102); The new pavement layer (3) comprises, from bottom to top: The oil-permeable layer (301), the lower seal layer (302), the coarse-grained asphalt concrete layer (303), the tack coat (304), and the fine-grained asphalt concrete layer (305).

2. The urban road new-old connection structure according to claim 1, characterized in that: The thickness ratio of the coarse-grained asphalt concrete layer (303) to the fine-grained asphalt concrete layer (305) is 7:

4.

3. The urban road connection structure according to claim 1, characterized in that: The reinforcement component (4) includes a snap-fit ​​part (401) embedded in the third step (103) and a pre-embedded part (402) embedded in the coarse-grained asphalt concrete layer (303).

4. The urban road connection structure according to claim 3, characterized in that: The locking part (401) is an expansion bolt.

5. The urban road new-old connection structure according to claim 3, characterized in that, The embedded part (402) includes: Connecting plate (4021) connects to the snap-fit ​​part (401); Two pull rods (4022) are provided and welded to the two ends of the connecting plate (4021) on the side opposite to the snap-fit ​​part (401); Two limit plates (4023) are provided and are vertically fixedly connected to the pull rod (4022).

6. The urban road new-old connection structure according to claim 5, characterized in that: The pull rod (4022) is provided with an external thread, and the pre-embedded part (402) also includes a clamping nut (4024) threadedly connected to the pull rod (4022). Each pull rod (4022) is provided with two clamping nuts (4024) to clamp the limiting plate (4023).

7. A structure for connecting old and new urban roads according to any one of claims 1 to 6, characterized in that: A fiberglass geogrid (5) is laid at the top of the junction between the second step (102) and the new road base (2).

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