A new and old road surface splicing structure for road expansion
By setting a stepped structure and combined connectors at the contact surface between the old and new roadbeds, and combining drainage and stress dispersion measures, the problems of insufficient strength and rainwater infiltration at the junction of the old and new road surfaces were solved, thereby improving the stability and durability of the highway.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG TONGDA ROAD & BRIDGE PLANNING & DESIGN CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-26
AI Technical Summary
The existing splicing structure of new and old road surfaces is difficult to effectively resist the longitudinal shear force generated by vehicle loads at the joint, which makes the new and old roadbeds prone to slippage and separation. In addition, traditional joint filling treatment cannot completely prevent rainwater from seeping in, resulting in roadbed softening and reflective cracks, thus shortening the service life of the highway.
The contact surface between the old and new roadbeds is stepped, and components such as fixing layers, reinforcing plates, I-beams, tie rods and ropes are used to enhance the longitudinal connection strength. Asphalt macadam drainage layers and reinforcing grids are used to achieve rapid drainage and stress dispersion, preventing cracks and slippage.
It enhances the connection stability between the old and new roadbeds, prevents misalignment and cracking, extends the service life of the highway, effectively prevents rainwater infiltration, and improves the road surface's resistance to deformation and cracking.
Smart Images
Figure CN224412240U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of road construction technology, and in particular to a new and old road surface splicing structure for highway expansion. Background Technology
[0002] With the rapid development of China's social economy, the proportion of private cars owned by people is constantly increasing. This has led to traffic congestion on some roads due to their narrowness. In addition, the cost of building a new road is high, so existing roads are usually widened by connecting and extending existing ones.
[0003] Common highway pavement splicing structures mainly consist of three parts: subgrade, base course, and surface course. In terms of connection construction, some technologies enhance integrity by laying geogrids at the interface between the old and new subgrades, and by cutting and filling the joints to prevent rainwater infiltration. These structures achieve the initial connection and load-bearing function of the old and new pavements through the synergistic effect of the various layers of materials.
[0004] Existing splicing structures, relying on stepped excavation and geogrids, are insufficient to effectively resist the longitudinal shear forces generated by vehicle loads, making it easy for the old and new roadbeds to shift and separate. Regarding drainage and crack resistance, traditional joint filling methods cannot completely prevent rainwater from seeping into the splicing joints, leading to roadbed softening. Furthermore, the pavement structure lacks effective stress dispersion measures, and the localized stress generated by vehicle traffic easily triggers reflective cracks, shortening the service life of the highway. Therefore, a new splicing structure for highway expansion is proposed to address these issues. Utility Model Content
[0005] To overcome the above deficiencies, this utility model provides a splicing structure for new and old road surfaces in highway expansion, aiming to improve the problem of insufficient longitudinal connection strength between new and old roadbeds in the prior art, which makes them prone to misalignment and separation.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A new and old road surface splicing structure for highway expansion includes an old roadbed and a new roadbed. The contact surface between the old roadbed and the new roadbed is stepped. A fixing layer is fixedly connected to the bottom of the new roadbed. A reinforcing plate is fixedly connected to the bottom of the fixing layer. A slot is opened in the middle of the old roadbed. The reinforcing plate is engaged with the slot.
[0008] As a further description of the above technical solution:
[0009] The contact surface between the old roadbed and the new roadbed is provided with I-shaped plate one and I-shaped plate two. A tie rod one is fixedly connected to the outside of I-shaped plate one, a pull rope is fixedly connected to the outside of tie rod one, and a tie rod two is fixedly connected to the outside of I-shaped plate two.
[0010] As a further description of the above technical solution:
[0011] The old roadbed has a groove 1 in the middle, and the new roadbed has a groove 2 in the middle. The I-shaped plate 1 is engaged with the groove 1, and the I-shaped plate 2 is engaged with the groove 2.
[0012] As a further description of the above technical solution:
[0013] The pull rope is fixedly connected between the pull rod one and the pull rod two;
[0014] As a further description of the above technical solution:
[0015] A concrete slurry layer is fixedly connected to the top of the new roadbed, and an asphalt macadam drainage layer is fixedly connected to the top of the concrete slurry layer.
[0016] As a further description of the above technical solution:
[0017] A reinforcing grid is fixedly connected to the top of the asphalt macadam drainage layer, and an asphalt layer is fixedly connected to the top of the reinforcing grid.
[0018] As a further description of the above technical solution:
[0019] The old roadbed and the new roadbed are reinforced with reinforcing ribs at their midpoints.
[0020] This utility model has the following beneficial effects:
[0021] 1. In this utility model, the new and old roadbeds are firmly fixed together by the fixing layer and reinforcing plate at the bottom of the new roadbed and the slot in the middle of the old roadbed, which enhances the longitudinal connection strength. The reinforcement of the contact surface, consisting of I-shaped plate, tie rod and rope, prevents cracking or misalignment at the splice, enhances the overall toughness and deformation resistance of the roadbed, and extends the service life of the highway.
[0022] 2. In this invention, the special porous structure of the asphalt-aggregate drainage layer can quickly guide rainwater to flow laterally, preventing water from seeping into the roadbed. The reinforcing grid acts as a reinforcement, not only enhancing the crack resistance of the asphalt layer but also effectively dispersing pavement stress and preventing pavement deformation and cracking caused by vehicle traffic. As a surface protection layer for the road surface, the asphalt layer has good waterproof and wear-resistant properties. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of a new and old road surface splicing structure for highway expansion proposed in this utility model.
[0024] Figure 2 This is a schematic diagram of the fixed layer of a new and old road surface splicing structure for highway expansion proposed in this utility model;
[0025] Figure 3 This is a schematic diagram of the tension rope for a highway expansion joint structure using a new and old road surface;
[0026] Figure 4 for Figure 2 Enlarged view of point A in the middle.
[0027] Legend:
[0028] 1. Old roadbed; 2. New roadbed; 3. Asphalt macadam drainage layer; 4. Reinforcing grid; 5. Asphalt layer; 6. Concrete slurry layer; 7. Fixing layer; 8. Reinforcing plate; 9. Slot; 10. Reinforcing bar; 11. Groove one; 12. I-beam one; 13. I-beam two; 14. Tie rod one; 15. Tie rope; 16. Tie rod two; 17. Groove two. Detailed Implementation
[0029] 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.
[0030] Reference Figures 1-4 This utility model provides an embodiment of a new and old road surface splicing structure for highway expansion, comprising an old roadbed 1 and a new roadbed 2. The contact surface between the old roadbed 1 and the new roadbed 2 is stepped. A fixing layer 7 is fixedly connected to the bottom of the new roadbed 2, and a reinforcing plate 8 is fixedly connected to the bottom of the fixing layer 7. A slot 9 is provided in the middle of the old roadbed 1, and the reinforcing plate 8 is engaged with the slot 9, forming a tenon-and-mortise interlocking. This structure can evenly distribute the load to the entire new and old roadbed 1, avoiding stress concentration at the splice. The unique cross-sectional shape of the I-beam not only increases the contact area with the groove, but also effectively resists the shear force generated by the lateral displacement of the roadbed through its own bending resistance. A concrete slurry layer 6 is fixedly connected to the top of the new roadbed 2, and an asphalt macadam drainage layer 3 is fixedly connected to the top of the concrete slurry layer 6. A reinforcing grid 4 is fixedly connected to the top of the asphalt macadam drainage layer 3, and an asphalt layer 5 is fixedly connected to the top of the reinforcing grid 4. A reinforcing bar 10 is provided in the middle of the old roadbed 1 and the new roadbed 2. The reinforcing bar 10 can enhance the overall strength of the old and new roadbeds 1, penetrate through the middle of the old roadbed 1 and the new roadbed 2, and be closely integrated with the surrounding soil, thereby improving the tensile and compressive strength of the old and new roadbeds 1 and effectively improving the bearing capacity of the roadbed.
[0031] Reference Figures 2-4The contact surfaces of the old roadbed 1 and the new roadbed 2 are provided with I-shaped plates 12 and 13. A tie rod 14 is fixedly connected to the outside of I-shaped plate 12, and a rope 15 is fixedly connected to the outside of tie rod 14. A tie rod 16 is fixedly connected to the outside of I-shaped plate 13. A groove 11 is formed in the middle of the old roadbed 1, and a groove 17 is formed in the middle of the new roadbed 2. I-shaped plate 12 engages with groove 11, and I-shaped plate 13 engages with groove 17. The tie rope 15 is fixedly connected between tie rod 14 and tie rod 16. When the roadbed undergoes lateral deformation due to vehicle load, temperature changes, or foundation settlement, the tie rod can quickly transfer stress to the tie rope 15. The tie rope 15 is highly flexible and wear-resistant, and its elastic deformation capacity can buffer instantaneous stress impacts while ensuring uniform tension distribution. The unique cross-sectional shape of the I-beam increases the contact area with the groove and effectively resists the shear force generated by the lateral displacement of the roadbed through its own bending resistance. This dynamically balances the stress state of the old and new roadbeds 1, avoiding the risk of cracking caused by excessive local stress.
[0032] Working principle: In highway expansion projects, the old roadbed 1 and the new roadbed 2 are set in a stepped shape to increase the contact surface and provide greater friction. The fixing layer 7 and reinforcing plate 8 at the bottom of the new roadbed 2 are interlocked with the slot 9 in the middle of the old roadbed 1 to improve the stability of the connection between the old and new roadbed 1.
[0033] The groove 11 of the old roadbed 1 and the groove 17 of the new roadbed 2 are respectively engaged with I-beam 12 and I-beam 23. Tie rod 14, tie rod 2 16 and tie rope 15 enhance the connection strength between the old and new roadbeds 1. When the roadbed deforms due to factors such as temperature changes and vehicle impacts, the tie rope 15 can transmit and disperse stress in a timely manner through the tie rods, preventing cracks or misalignment at the joint.
[0034] The concrete slurry layer 6 serves as the foundation load-bearing layer, providing stable support. The asphalt macadam drainage layer 3 utilizes its porous structure to quickly guide rainwater to drain laterally, preventing water from seeping into the roadbed and causing water damage. The reinforcing grid 4 is laid on top of the asphalt macadam drainage layer 3, which can suppress the generation of reflective cracks. The asphalt layer 5 provides waterproof and wear-resistant surface protection, reducing the erosion of the internal structure by external factors.
[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A splicing structure for new and old road surfaces in highway expansion, comprising an old roadbed (1) and a new roadbed (2), characterized in that: The contact surface between the old roadbed (1) and the new roadbed (2) is stepped. A fixing layer (7) is fixedly connected to the bottom of the new roadbed (2). A reinforcing plate (8) is fixedly connected to the bottom of the fixing layer (7). A slot (9) is opened in the middle of the old roadbed (1). The reinforcing plate (8) is engaged with the slot (9).
2. The new and old pavement splicing structure for highway extension according to claim 1, characterized in that: The contact surface between the old roadbed (1) and the new roadbed (2) is provided with I-shaped plate one (12) and I-shaped plate two (13). A tie rod one (14) is fixedly connected to the outside of the I-shaped plate one (12), a pull rope (15) is fixedly connected to the outside of the tie rod one (14), and a tie rod two (16) is fixedly connected to the outside of the I-shaped plate two (13).
3. The new and old road surface splicing structure for highway expansion according to claim 2, characterized in that: The old roadbed (1) has a groove 1 (11) in the middle, and the new roadbed (2) has a groove 2 (17) in the middle. The I-shaped plate 1 (12) is engaged with the groove 1 (11), and the I-shaped plate 2 (13) is engaged with the groove 2 (17).
4. The new and old road surface splicing structure for highway expansion according to claim 2, characterized in that: The pull rope (15) is fixedly connected between the first pull rod (14) and the second pull rod (16).
5. The new and old road surface splicing structure for highway expansion according to claim 1, characterized in that: The top of the new roadbed (2) is fixedly connected to a concrete slurry layer (6), and the top of the concrete slurry layer (6) is fixedly connected to an asphalt macadam drainage layer (3).
6. The new and old road surface splicing structure for highway expansion according to claim 5, characterized in that: The top of the asphalt macadam drainage layer (3) is fixedly connected to a reinforcing grid (4), and the top of the reinforcing grid (4) is fixedly connected to an asphalt layer (5).
7. The new and old road surface splicing structure for highway expansion according to claim 1, characterized in that: The old roadbed (1) and the new roadbed (2) are provided with reinforcing ribs (10) in the middle.