A new and old asphalt pavement post-cast layered lapping structure

Abstract

The utility model discloses a new and old asphalt pavement post -poured layered lap -joint structure, including base layer and old asphalt layer, the connecting end of old asphalt layer is provided with the step, the surface of base layer near step one side and step surface all are provided with the slot hole, the step and base layer surface jointly lay down have the connecting net, in the utility model, set up base layer, old asphalt layer, new asphalt layer, slot hole, connecting net, expansion assembly and extrusion subassembly, after the expansion assembly inserts the slot hole inside of base layer and old asphalt layer, utilize extrusion subassembly and insert expansion assembly, make the vertical pipe top of expansion assembly and open, and the stable fixing of connecting net is carried out to the collision component, utilize expansion assembly can increase the connecting point between old asphalt layer and new asphalt layer, has further improved the stability of connection, guarantees the fixed solid, reliable of connecting net, strengthens weak node asphalt adhesion, improves the joint end face pouring quality, avoids producing the crack.

Description

Technical Field

[0001] This utility model relates to the field of asphalt pouring technology, and in particular to a post-pouring layered overlapping structure for new and old asphalt pavements. Background Technology

[0002] In traditional asphalt pavement maintenance and reconstruction projects, the longitudinal splicing of new and old pavements is a crucial technical step. Conventional direct hot-welding methods often result in reflective cracking, interlayer slippage, and rainwater infiltration under vehicle and environmental loads due to differences in the properties of the new and old materials, insufficient interlayer bonding, and inadequate joint compaction. To overcome these problems, a post-cast layered overlapping structure has emerged. This technology uses stepped layering to cut the edges of the old pavement, creating a clean and rough vertical surface. Then, modified emulsified asphalt and other tack coat materials are applied layer by layer, and the new asphalt mixture is laid and compacted layer by layer from bottom to top. This creates an interlocking and tightly bonded transition zone between the new and old pavement layers, significantly improving the structural integrity and fatigue resistance of the joints and effectively extending the road's service life.

[0003] However, existing post-cast layered overlapping structures have the following drawbacks: Existing overlapping structures generally rely on a single horizontal bonding, lacking effective vertical mechanical interlocking and a continuous load-bearing skeleton between the old and new asphalt layers, resulting in insufficient interlayer shear resistance; their joint treatment is mostly planar, with limited interface area and significant stress concentration, easily leading to longitudinal slippage and reflective cracking under repeated traffic loads; simultaneously, conventional connecting mesh fixing methods are passive and unstable, making it difficult to ensure coordinated deformation of the old and new materials, leaving the interface as a weak point in the structure. Therefore, further improvements are needed. To this end, we propose a post-cast layered overlapping structure for new and old asphalt pavements. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a new type of post-cast layered overlapping structure for old and new asphalt pavements.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a post-cast layered overlapping structure for new and old asphalt pavement, comprising a base course and an old asphalt layer, wherein a step is provided at the connecting end of the old asphalt layer, and slots are provided on the surface of the base course near the step and on the surface of the step, a connecting mesh is laid on the surface of the step and the base course, an expansion component is fixed inside the slots, and the connecting mesh is fixed to the surface of the step and the base course through the expansion component, an extrusion component is inserted inside the expansion component, and a new asphalt layer is poured on the surface of the base course away from the old asphalt layer and on the surface of the step.

[0006] Furthermore, the expansion assembly includes a vertical tube, the bottom surface of which is provided with external threads, and the bottom of the vertical tube is fixed inside the slot by the external threads.

[0007] Furthermore, a nut is fixed in the middle of the vertical tube.

[0008] Furthermore, a pressure plate is fixed in the middle of the vertical tube between the nut and the external thread, and the pressure plate is located on the upper surface of the connecting mesh.

[0009] Furthermore, the top sidewall of the vertical tube has multiple slots, and the extrusion assembly includes a conical rod with a cap fixed to the top and the bottom of the conical rod inserted into the top of the vertical tube.

[0010] Furthermore, the outer wall of the cone rod is provided with multiple side ridges, which are slidably inserted into the inside of the strip-shaped opening.

[0011] The beneficial effects of this utility model are: In use, this invention comprises a base layer, an old asphalt layer, a new asphalt layer, slots, a connecting mesh, an expansion component, and an extrusion component. After the expansion component is inserted into the slots of the base layer and the old asphalt layer, the extrusion component is inserted into the expansion component, causing the top of the vertical tube of the expansion component to open. The collision component stabilizes and fixes the connecting mesh. The expansion component increases the number of connection points between the old and new asphalt layers, further improving the stability of the connection, ensuring that the connecting mesh is firmly and reliably fixed, strengthening the asphalt adhesion at weak nodes, improving the pouring quality of the joint end face, and preventing cracks. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a first sectional view of the present invention; Figure 2 This is a second sectional view of the present invention; Figure 3 This is the third sectional view of the present invention; Figure 4 This is the fourth sectional view of the present invention; Figure 5 This is a three-dimensional view of the expansion structure of this utility model.

[0014] The attached figures are labeled as follows: 1. Base layer; 2. Old asphalt layer; 201. Step; 3. New asphalt layer; 4. Groove; 5. Connecting mesh; 6. Expansion assembly; 61. Vertical pipe; 62. External thread; 63. Nut; 64. Pressure plate; 65. Strip opening; 7. Extrusion assembly; 71. Tapered rod; 72. Top cap; 73. Side edge. Detailed Implementation

[0015] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figures 1-5 As shown, a post-cast layered overlapping structure for new and old asphalt pavement is disclosed, comprising a base course 1 and an old asphalt layer 2. A step 201 is provided at the connection end of the old asphalt layer 2. Grooves 4 are provided on the surface of the base course 1 near the step 201 and on the surface of the step 201. A connecting mesh 5 is laid on the surface of the step 201 and the base course 1. An expansion component 6 is fixed inside the groove 4. The connecting mesh 5 is fixed to the surface of the step 201 and the base course 1 through the expansion component 6. An extrusion component 7 is inserted inside the expansion component 6. A new asphalt layer 3 is poured on the surface of the base course 1 away from the old asphalt layer 2 and on the surface of the step 201.

[0017] The expansion assembly 6 includes a vertical tube 61, the bottom surface of which is provided with an external thread 62, and the bottom of the vertical tube 61 is fixed to the inside of the slot 4 by the external thread 62.

[0018] Before installing the expansion component 6, slots 4 are first opened on the surface of the step 201 of the old asphalt layer 2 and the surface of the base layer 1. Then, connecting mesh 5 is laid on the surface of the step 201 and the base layer 1. The bottom of the vertical pipe 61 is screwed into the slot 4 through the external thread 62 to fix the vertical pipe 61.

[0019] A nut 63 is fixed in the middle of the vertical tube 61.

[0020] In this embodiment, the nut 63 is a hexagonal nut 63, which makes it convenient to turn the nut 63 with a wrench, thereby driving the bottom of the vertical tube 61 to be inserted into the slot 4.

[0021] A pressure plate 64 is fixed in the middle of the vertical tube 61 and between the nut 63 and the external thread 62. The pressure plate 64 is located on the upper surface of the connecting mesh 5.

[0022] After the bottom of the vertical tube 61 is inserted into the slot 4, the connecting mesh 5 is pressed and fixed by the pressure plate 64 to ensure the connection stability of the connecting mesh 5.

[0023] The top side wall of the vertical tube 61 has multiple slots 65. The extrusion assembly 7 includes a cone rod 71, the top of which is fixed with a top cap 72, and the bottom of which is inserted into the top of the vertical tube 61.

[0024] In this embodiment, the bottom diameter of the cone rod 71 is smaller than the inner diameter of the vertical pipe 61, and the top diameter of the cone rod 71 is larger than the inner diameter of the vertical pipe 61. After the vertical pipe 61 is fixed, the bottom of the cone rod 71 is inserted into the vertical pipe 61, and then the top cap 72 is struck with a hammer so that the cone rod 71 is completely inserted into the vertical pipe 61. After being squeezed by the cone rod 71, the top of the vertical pipe 61 will open along the strip opening 65, increasing the connection point for the subsequent pouring of the new asphalt layer 3.

[0025] The outer wall of the tapered rod 71 is provided with multiple side ridges 73, which are slidably inserted into the inside of the strip-shaped opening 65.

[0026] When the tapered rod 71 is first inserted into the vertical tube 61, the side edge 73 is aligned with the strip opening 65 and slid in. The side edge 73 and the strip opening 65 serve as limiting guides.

[0027] Working principle: First, a step 201 is made on the connecting section of the old asphalt layer 2, and then slots 4 are made on the surface of the step 201 of the old asphalt layer 2 and the surface of the base layer 1. The second step is to lay the connecting mesh 5 on the surface of the step 201 and the base layer 1, and then turn the nut 63 on the surface of the vertical pipe 61 with a wrench to screw the bottom of the vertical pipe 61 into the slot 4 through the external thread 62 to fix the vertical pipe 61. Then, the pressure plate 64 is used to press and fix the connecting mesh 5 to ensure the connection stability of the connecting mesh 5. The third step is to align the side edge 73 of the cone rod 71 with the strip opening 65 on the vertical pipe 61 and insert it. Use a hammer to strike the top cap 72 so that the cone rod 71 is completely inserted into the vertical pipe 61. After being squeezed by the cone rod 71, the top of the vertical pipe 61 will open along the strip opening 65, increasing the connection point for the subsequent pouring of the new asphalt layer 3. The fourth step involves pouring a new asphalt layer 3 onto the surface of step 201 and base layer 1, using expansion components 6 to increase the connection points between the old asphalt layer 2 and the new asphalt layer 3, and the expansion components 6 also increase the stability of the connecting net 5.

[0028] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A new and old asphalt pavement post-cast layered lapping structure, comprising a base layer (1) and an old asphalt layer (2), characterized in that: The old asphalt layer (2) has a step (201) at the connecting end. The surface of the base layer (1) near the step (201) and the surface of the step (201) are both provided with slots (4). The surface of the step (201) and the base layer (1) are jointly covered with a connecting net (5). An expansion component (6) is fixed inside the slot (4). The connecting net (5) is fixed to the surface of the step (201) and the base layer (1) through the expansion component (6). An extrusion component (7) is inserted inside the expansion component (6). A new asphalt layer (3) is poured on the surface of the base layer (1) away from the old asphalt layer (2) and the surface of the step (201).

2. The post-cast layered overlapping structure for new and old asphalt pavement according to claim 1, characterized in that: The expansion assembly (6) includes a vertical tube (61), the bottom surface of which is provided with an external thread (62), and the bottom of the vertical tube (61) is fixed inside the slot (4) by the external thread (62).

3. The post-cast layered overlapping structure for new and old asphalt pavement according to claim 2, characterized in that: A nut (63) is fixed in the middle of the vertical tube (61).

4. The post-cast layered overlapping structure for new and old asphalt pavement according to claim 3, characterized in that: A pressure plate (64) is fixed in the middle of the vertical tube (61) and between the nut (63) and the external thread (62), and the pressure plate (64) is located on the upper surface of the connecting mesh (5).

5. The post-cast layered lapping structure of new and old asphalt pavement according to claim 2, characterized in that: The top sidewall of the vertical tube (61) has multiple slots (65), and the extrusion assembly (7) includes a cone rod (71). The top of the cone rod (71) is fixed with a cap (72), and the bottom of the cone rod (71) is inserted into the top of the vertical tube (61).

6. The post-cast layered overlapping structure for new and old asphalt pavement according to claim 5, characterized in that: The outer wall of the cone rod (71) is provided with multiple side ridges (73), which are slidably inserted into the inside of the strip opening (65).

Images