Construction method for isotropic deformation of roadbed and pavement at lap joint of new and old roads
By setting up an anti-settlement structure at the interfaces of new and old roads, using horizontal anchors, micro-expansion high-strength grouting materials and longitudinal reinforcement mesh, the road surface crack problem caused by differential settlement of new and old roads is solved, and deformation consistency and crack resistance are achieved at the interface. Performance improvement.
Patent Information
- Application Number
- CN202411538587.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
At the interface between the new and old roads, due to differences in material properties, compaction degree and construction time, different settlements between the new and old roadbeds have caused reflective cracks on the road surface.
The anti-settlement structure is set up at the interfaces of new and old roads. By drilling holes on existing roads, horizontal anchors with barbed structures are placed, and horizontal anchors with micro-expanded high-strength grouting material and longitudinal reinforcement mesh are formed to form a horizontal slurry anchor connection by drilling holes on existing roads, and combining micro-expanded high-strength grouting material and longitudinal reinforcement mesh. and vertically reinforce the structure to ensure consistency of deformation at the interface.
It effectively avoids uneven settlement at the interface, prevents the occurrence of road surface cracks, enhances crack resistance, and ensures the stability of the connection between old and new roads.
Smart Images
Figure CN119145260A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of construction of jointing of new and old roads, and in particular to a method for constructing anisotropic deformation of roadbed and pavement at the joint of new and old roads. 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 the new and old roads to a certain extent, due to differences in factors such as the material properties, compaction degree, and construction time of the new and old roadbeds, as well as the poor quality of the 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. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a method for constructing anisotropic deformation of roadbed and pavement at the joint of new and old roads, and an anti-settlement structure is set at the joint of new and old pavements to avoid plastic deformation at the joint and produce differential settlement.
[0004] To achieve this technical purpose, the present invention adopts the following scheme: The construction method of isotropic deformation of roadbed and pavement at the junction of new and old roads includes the following steps: S1. Drill horizontal holes arranged in rows in the middle of each structural layer of the existing road, with the ends of the horizontal holes located on the side connecting to the new road surface; S2. Place the horizontal anchor rod with a concave-convex surface in the horizontal hole of the existing road, place the horizontal anchor rod with a barb structure on one side of the newly built road, and fix the horizontal anchor rod with a concave-convex surface and the horizontal anchor rod with a barb structure at the same height and in the same horizontal hole on a vertical engaging nail; S3. Inject micro-expansion high-strength grouting material into the horizontal hole of the horizontal anchor rod with a concave-convex surface, and construct a new pavement structure layer at the overlap after the grouting material reaches the specified strength; S4. The newly built pavement structure layer is a paved or cast-in-place structure layer. First, measure steel bars are set along the longitudinal direction of the road. The measure steel bars and horizontal anchor rods with barbed structures are combined into a mesh to connect the newly built structure layer and the anchor rods into a whole to increase the crack resistance.
[0005] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention opens a horizontal hole on the existing road and inserts a horizontal anchor rod with a concave-convex surface, connects the horizontal anchor rod with a barbed structure on the new road side through bite nails, so as to form a horizontal anchor rod with anti-backward function, supplemented by a longitudinal reinforcing mesh (measure steel bars) and a micro-expansion high-strength grouting material to form a horizontal slurry anchor connection, and a vertical reinforcement structure formed by vertical bite nails, so as to ensure the uniformity of deformation of the overlap position in the X direction and the Y direction, and avoid the occurrence of road cracks caused by uneven settlement.
[0006] Furthermore, the vertical interlocking nails are arranged to penetrate the structural layer of the current layer and the structural layers on the upper and lower sides.
[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 newly built pavement structure layer first constructs the lowest roadbed. After the construction of the lowest roadbed is completed, the upper structure layer is constructed by repeating steps S1-S4, and the horizontal anchor rods with barbed structures of the upper structure layer are fixedly connected with the vertical bite nails of the lowest roadbed layer; the above operation is repeated for each layer until the pavement layer construction is completed. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 A construction structure diagram of anisotropic deformation of the roadbed and pavement at the junction of the new and old roads provided by an embodiment of the present invention; Figure 2 Schematic diagram of two horizontal anchor rods provided by the present invention; The markings in the figure are: 1. Existing road; 2. Horizontal hole; 3. First horizontal anchor rod; 4. Vertical bite nail; 5. Second horizontal anchor rod; 51. Ring; 6. Measure steel bar; 7. New road base. DETAILED DESCRIPTION
[0010] 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.
[0011] like Figure 1 As shown ( Figure 1 This is a state diagram of the top structural layer of the construction diagram. In order to better reflect the structural status of different construction steps, Figure 1 The second new structural layer is hidden in the figure). The present invention provides a method for constructing anisotropic deformation of the roadbed and pavement at the junction of the new and old roads. The method comprises the following steps: S1. Drill horizontal holes 2 arranged in a row in the middle of each structural layer of the existing road 1 using a drilling device, with the outlet of the horizontal hole 2 facing the new road side. Preferably, the depth of the horizontal hole 2 is 1±0.1m, the hole diameter is 50±5mm, and the longitudinal spacing of the horizontal holes 2 is 200mm.
[0012] S2. Place the first horizontal anchor rod 3 with a concave-convex surface in the horizontal hole of the existing road, with its outer end exposed on the outside of the existing road, and set a vertical bite nail at this position. One side wall of the vertical bite nail is welded to the end of the first horizontal anchor rod 3 with a concave-convex surface, and the other side wall of the vertical bite nail 4 is welded to the second horizontal anchor rod 5 with a barb structure, and the three form an integral structure. Preferably, the vertical bite nail 4 is inserted into the lower structural layer, and the upper end of the vertical bite nail 4 extends to the upper new structural layer, that is, the vertical bite nail 4 penetrates the current structural layer and the upper and lower structural layers. The second horizontal anchor rod 5 is welded to a plurality of circular rings 51 along the length direction on an ordinary anchor rod, such as Figure 2 As shown, a barbed structure is formed to increase the contact area between the second horizontal anchor rod and the newly built roadbed.
[0013] S3, injecting micro-expansion high-strength grouting material into the horizontal hole 2 where the first horizontal anchor rod 3 is placed, and constructing the structural layer of the new road surface at the overlap after the grouting material reaches the specified strength. The grouting material is a commercially available product.
[0014] S4. The newly built pavement structure layer is a paved or cast-in-place structure layer. First, measure steel bars 6 are set along the longitudinal direction of the road. The measure steel bars 6 and the second horizontal anchor rods 5 are combined into a mesh to connect the newly built structure layer and the anchor rods into a whole to increase the crack resistance.
[0015] The construction of the structural layer of the newly built road surface starts with the newly built road base layer 7 of the lowest layer. First, the two horizontal anchor rods and vertical bite nails 4 of the lowest 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 steps S1-S4 are repeated, and the second horizontal anchor rod of the upper structural layer is welded and fixed to the vertical bite nails of the lowest newly built road base layer 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 at the overlap of the new and old roads with the functions of preventing settlement and cracking.
[0016] The anti-settlement structure prevents the joint from experiencing plastic accumulation deformation due to consolidation, compaction and other processes in subsequent use, thereby causing a certain degree of differential settlement, resulting in cracks and other surface defects at the junction of the new and old pavements. This method sets a horizontal slurry anchor connection formed by horizontal anchor rods + longitudinal reinforcement mesh (measure steel bars) + micro-expansion high-strength grouting materials with "anti-regression" functions between the new road and the existing road, as well as a vertical reinforcement structure formed by vertical bite nails, to ensure the uniformity of deformation in the X and Y directions of the overlap position, and avoid the occurrence of pavement cracks caused by uneven settlement.
[0017] Finally, it should be noted that the above 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 variations 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 method for constructing anisotropic deformation of roadbed and pavement at the junction of new and old roads, characterized in that: The steps include: S1. Drill horizontal holes arranged in rows in the middle of each structural layer of the existing road, with the ends of the horizontal holes located on the side connecting to the new road surface; S2. Place the horizontal anchor rod with a concave-convex surface in the horizontal hole of the existing road, place the horizontal anchor rod with a barb structure on one side of the newly built road, and fix the horizontal anchor rod with a concave-convex surface and the horizontal anchor rod with a barb structure at the same height and in the same horizontal hole on a vertical engaging nail; S3. Inject micro-expansion high-strength grouting material into the horizontal hole of the horizontal anchor rod with a concave-convex surface, and construct a new pavement structure layer at the overlap after the grouting material reaches the specified strength; S4. The newly built pavement structure layer is a paved or cast-in-place structure layer. First, measure steel bars are set along the longitudinal direction of the road. The measure steel bars and horizontal anchor rods with barbed structures are combined into a mesh to connect the newly built structure layer and the anchor rods into a whole to increase the crack resistance.
2. The method for constructing anisotropic deformation of roadbed and pavement at the junction of new and old roads according to claim 1 is characterized in that: The vertical interlocking nails are set to penetrate the structural layer of the current layer and the structural layers above and below.
3. The method for constructing anisotropic deformation of roadbed and pavement at the junction of new and old roads according to claim 1, characterized in that: The depth of the horizontal holes is 1±0.1m, the diameter is 50±5mm, and the longitudinal spacing of the horizontal holes is 200mm.
4. The method for constructing anisotropic deformation of roadbed and pavement at the junction of new and old roads according to claim 1, characterized in that: The new pavement structure layer is constructed firstly with the lowest roadbed. When the lowest roadbed is constructed, the upper structure layer is constructed by repeating steps S1-S4, and the horizontal anchor rods with barbed structures of the upper structure layer are fixedly connected with the vertical bite nails of the lowest roadbed. The above operation is repeated for each layer until the pavement layer is constructed.