Roadbed and pavement connecting structure at lap joint of new and old roads
By setting up an anti-settlement structure at the connections of new and old roads, the first concave-convex horizontal anchor and the second horizontal anchor with barbed are used, combined with vertical occlusion nails and micro-expanded high-strength grouting material to form an overall connection structure, which solves the problem of differential settlement at the connections of new and old roads, prevents cracks, and improves the stability and crack resistance of the connection.
Patent Information
- Application Number
- CN202422647248.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Due to differences in material properties, compaction degree and construction time at the joints of new and old roads, different settlements are prone to occur during long-term use, forming reflective cracks.
Anti-settlement structure is set up at the overlapping points of the new and old roads, and the first horizontal anchor with a concave surface and the second horizontal anchor with a barbed structure are used to fix the connection with the first horizontal anchor through vertical occlusion nails, and the second horizontal anchor is buried in the new pavement structure layer to form an overall structure and increase crack resistance.
It effectively avoids uneven settlement at the joints of old and new roads, prevents the occurrence of road surface cracks, ensures the deformation consistency of overlapping positions in the horizontal and vertical directions, and enhances the firmness of the connection and the anti-settlement effect.
Smart Images
Figure CN223281138U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of new and old road butt joint construction, in particular to a roadbed and pavement connection structure at the joint of a new and old road. Background Art
[0002] At present, the domestic construction of the joints between new and old roads basically adopts a stepped joint overlap method, supplemented by the construction method of geogrids and fiberglass grid materials. Although this method has solved the cracking at the joints between new and old roads to a certain extent, due to differences in material properties, compaction degree, construction time and other factors between the new and old roadbeds, as well as poor quality of materials used and non-standard construction technology, the connection between the new and old roads is prone to differential settlement during long-term use, resulting in reflective cracks in the road surface. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a roadbed and pavement connection structure at the junction of new and old roads, and an anti-settlement structure is set at the junction of the new and old pavements to avoid plastic deformation at the junction and differential settlement.
[0004] To achieve this technical purpose, the present invention adopts the following scheme: the roadbed and pavement connection structure at the junction of the new and old roads includes an existing pavement structure layer and a newly built pavement structure layer connected together, and also includes a first horizontal anchor rod with a concave-convex surface, a second horizontal anchor rod with a barb structure and a vertical bite nail. Each structural layer of the existing pavement is provided with horizontal holes arranged in rows, and a first horizontal anchor rod is inserted in each horizontal hole. The end of the first horizontal anchor rod exposed outside the horizontal hole is fixedly connected to a vertical bite nail, and the vertical bite nail is also fixedly connected to the second horizontal anchor rod. The second horizontal anchor rod is buried in the newly built pavement structure layer corresponding to the existing pavement structure layer.
[0005] Compared with the prior art, the beneficial effect of the present invention is that the present invention embeds a first horizontal anchor rod in each structural layer of the existing road, and fixes it with the second horizontal anchor rod of the newly constructed structural layer through vertical bite nails, forming a structure with anti-retrogression and anti-sinking, ensuring the uniformity of deformation of the overlap position in the X direction (horizontal direction) and the Y direction (vertical direction), and avoiding the occurrence of road cracks caused by uneven settlement.
[0006] Furthermore, when the vertical bite nails are set, they penetrate the structural layer where the first horizontal anchor rod connected by the vertical bite nails is located and the adjacent upper and lower structural layers, except for the top pavement layer; the vertical bite nails connect the adjacent layers, making the inter-layer structural connection more firm and improving the anti-settlement effect.
[0007] Furthermore, the depth of the horizontal hole is 1±0.1 m, the diameter is 50±5 mm, and the longitudinal spacing of the horizontal holes is 200 mm.
[0008] Furthermore, the upper end of the vertical bite nail is fixedly connected to the second horizontal anchor rod of the adjacent upper structural layer, and the vertical bite nail is connected to the support of the upper structural layer, thereby enhancing the structural connectivity and avoiding differential settlement.
[0009] Furthermore, the second horizontal anchor rod is connected with a measure steel bar as a reinforcement structure of the newly built pavement structure layer. The measure steel bar and the second horizontal anchor rod form a mesh, changing the line connection form between the newly built pavement and the second horizontal anchor rod to a surface connection form, forming the newly built structure layer and the anchor rod into a whole, and increasing the crack resistance.
[0010] Furthermore, the second horizontal anchor rod is provided with two or more circular rings along the length direction to form a barb structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 A schematic diagram of the connection structure of the roadbed and pavement at the junction of the new and old roads provided in an embodiment of the utility model;
[0012] Figure 2 Schematic diagram of two horizontal anchor rods provided in an embodiment of the present utility model;
[0013] Markings in the figure are: 1. Existing road; 2. Horizontal hole; 3. First horizontal anchor rod; 4. Vertical interlocking nail; 5. Second horizontal anchor rod; 51. Circular ring; 6. Measure steel bar; 7. New roadbed. DETAILED DESCRIPTION
[0014] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific implementation methods, but the present invention is not limited thereto.
[0015] like Figure 1 As shown ( Figure 1 This is the structural diagram of the top structural layer when the construction diagram is shown. In order to better reflect the structural status of different construction steps, Figure 1The utility model provides a roadbed and pavement connection structure at the junction of an old and new road, comprising different structural layers of an existing road 1, a new road structural layer, first horizontal anchor rods 3, second horizontal anchor rods 5, and vertical interlocking nails 4. The different structural layers of the new road are connected one-to-one with the corresponding structural layers of the existing road 1. Each structural layer of the existing road 1 is provided with horizontal holes 2 arranged in rows, with the open ends of the horizontal holes 2 facing the new road. Each horizontal hole 2 is inserted into a first horizontal anchor rod 3. The first horizontal anchor rod 3 has a concave-convex surface structure, similar to a grouting anchor rod structure, and grouting material is poured into the horizontal hole 2. The outer end of the first horizontal anchor rod 3 is exposed outside the horizontal hole 2, and the exposed end is welded to the side wall of a vertical bite nail 4. The side wall of the vertical bite nail 4 is also fixed with a second horizontal anchor rod 5. The second horizontal anchor rod 5 and the first horizontal anchor rod 3 are located on the same straight line, and the second horizontal anchor rod 5 is buried in the new pavement structure layer. The second horizontal anchor rod 5 is composed of an ordinary anchor rod and a plurality of rings. A plurality of rings are welded on the ordinary anchor rod at equal or unequal intervals along the length of the ordinary anchor rod to form an anchor rod structure with barbs, such as Figure 2 shown.
[0016] In some preferred embodiments, the second horizontal anchor rods 5 are connected to reinforced steel bars 6 perpendicular to the second horizontal anchor rods 5 to form a structural mesh. The vertical engaging nails 4 are installed to penetrate the structural layer where the first horizontal anchor rod 3 is located and the adjacent structural layers above and below it, excluding the top pavement layer. The upper ends of the vertical engaging nails 4 are fixedly connected to the second horizontal anchor rod 5 in the adjacent upper structural layer.
[0017] Furthermore, the depth of the horizontal hole 2 is 1±0.1 m, the diameter is 50±5 mm, and the longitudinal spacing of the horizontal holes 2 is 200 mm.
[0018] The construction method for connecting the old and new roads is to construct stepped steps on the subgrade, pavement and other structural layers of the existing road according to the dimensions required by the drawings to connect the new road. The steps include the following:
[0019] S1. Use drilling equipment to drill horizontal holes 2 arranged in a row in the middle of each structural layer of the existing road 1, with the outlets of the horizontal holes 2 facing the new road. Preferably, the depth of the horizontal holes 2 is 1±0.1m, the hole diameter is 50±5mm, and the longitudinal spacing of the horizontal holes 2 is 200mm.
[0020] S2. Place the first horizontal anchor rod (3) with a concavo-convex surface in the horizontal hole of the existing road, with its outer end exposed outside the existing road. A vertical interlocking nail is installed at this location. One side wall of the vertical interlocking nail is welded to the end of the first horizontal anchor rod (3) with a concavo-convex surface. The other side wall of the vertical interlocking nail (4) is welded to the second horizontal anchor rod (5) with a barbed structure, forming an integrated structure. Preferably, the vertical interlocking nail (4) is inserted into the underlying structural layer, and the upper end of the vertical interlocking nail (4) extends to the next newly constructed structural layer, i.e., the vertical interlocking nail (4) penetrates the current structural layer and the structural layers above and below it.
[0021] S3. Inject a slightly expansive high-strength grouting material into the horizontal hole 2 where the first horizontal anchor rod 3 is placed. After the grouting material reaches the specified strength, construct the structural layer of the new road surface at the overlap. The grouting material is a commercially available product.
[0022] S4. The new pavement structure layer is a paved or cast-in-place structure layer. First, install protective steel bars 6 along the longitudinal direction of the road. The protective steel bars 6 and the second horizontal anchor rods 5 form a mesh, connecting the new structure layer and the anchor rods into a whole to improve crack resistance. Preferably, the protective steel bars have a diameter of 14 mm.
[0023] The construction of the structural layer of the new road surface starts from the bottom layer of the new road base layer 7. First, the two horizontal anchor rods and vertical bite nails 4 of the bottom layer are installed and welded, and the roadbed materials such as sand are spread according to S1-S4. Then, the adjacent upper structural layer is constructed, and the S1-S4 steps are repeated. The second horizontal anchor rod of the upper structural layer is welded and fixed to the vertical bite nails of the bottom layer of the new road base to ensure that the upper and lower anti-settlement structures form a whole. The remaining structural layers are completed in the same process until the construction of the top pavement layer is completed, forming a roadbed and pavement anisotropic deformation anisotropic construction method with anti-settlement and anti-cracking properties at the junction of the old and new roads.
[0024] Anti-settlement structures prevent the joints from experiencing plastic deformation during subsequent use due to processes such as consolidation and compaction, which can lead to differential settlement and cracking at the junction of the new and old pavements. This method uses a horizontal grout-anchor connection formed by horizontal anchor rods with "anti-regression" functions, longitudinal reinforcement mesh (rebar), and micro-expansion high-strength grouting material, along with a vertical reinforcement structure formed by vertical interlocking nails, between the new and existing roads to ensure uniform deformation in both the X and Y directions at the joints, thus preventing pavement cracks caused by uneven settlement.
[0025] Finally, it should be noted that the above-listed examples are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and modifications fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.
Claims
1. A roadbed and pavement connection structure at the junction of a new and old road, comprising an existing pavement structure layer and a newly constructed pavement structure layer connected together, characterized in that: It also includes a first horizontal anchor rod with a concave-convex surface, a second horizontal anchor rod with a barb structure and a vertical bite nail. Each structural layer of the existing pavement is opened with horizontal holes arranged in rows, a first horizontal anchor rod is inserted into each horizontal hole, and grouting material is poured; the end of the first horizontal anchor rod exposed outside the horizontal hole is fixedly connected to a vertical bite nail, and the vertical bite nail is also fixedly connected to the second horizontal anchor rod, and the second horizontal anchor rod is buried in a new pavement structure layer corresponding to the existing pavement structure layer.
2. The roadbed and pavement connection structure at the junction of new and old roads according to claim 1 is characterized in that: When the vertical bite nails are set, they penetrate the structural layer where the first horizontal anchor rod connected to the vertical bite nails is located and the adjacent upper and lower structural layers.
3. The roadbed and pavement connection structure at the junction of new and old roads according to claim 1 is characterized in that: The depth of the horizontal hole is 1±0.1m, the diameter is 50±5mm, and the longitudinal spacing of the horizontal holes is 200mm.
4. The roadbed and pavement connection structure at the junction of new and old roads according to claim 1, characterized in that: The upper end of the vertical bite nail is fixedly connected to the second horizontal anchor rod of the adjacent upper structural layer.
5. The roadbed and pavement connection structure at the junction of new and old roads according to claim 1, characterized in that: The second horizontal anchor rod is connected with steel bars as a reinforcement structure for the newly built pavement structure layer.
6. The roadbed and pavement connection structure at the junction of new and old roads according to claim 1, characterized in that: The second horizontal anchor rod is provided with two or more circular rings along the length direction to form a barb structure.