Asphalt new and old pavement lap joint construction method

Abstract

The invention discloses an asphalt new and old pavement lap joint construction method, and relates to the technical field of road engineering, and the method comprises the following specific steps: S1, carrying out multi-layer gradient cutting on the edge of an old pavement to form multi-layer cutting surfaces with different depths and widths on the edge of the old pavement; s2, the old pavement subjected to multi-layer gradient cutting is coated with a nano-composite bonding layer, and the bonding requirement of the new pavement and the old pavement is met through the nano-composite bonding layer; s3, preheating the old pavement by using a temperature control device; s4, paving a new pavement; s5, special multi-point vibration compaction equipment is adopted for the new asphalt layer pavement; according to the multi-layer gradient cutting design, the application of the nano-composite bonding layer material, the use of the multi-point vibration compaction equipment, the sensor and the intelligent processing center and the implementation of the temperature control construction process, the bonding strength, durability and crack resistance of the lap joint of the new pavement and the old pavement are remarkably improved, the service life of the pavement is prolonged, the maintenance cost is reduced, and the construction period is shortened. Wide application prospects are realized.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, and in particular to a construction method for overlapping new and old asphalt pavements. Background Technology

[0002] With the development of modern transportation, asphalt has become a major paving material for highways, urban roads, and airport runways due to its excellent smoothness, skid resistance, and user comfort. However, over time and with increasing traffic volume, roads inevitably suffer various forms of damage, such as cracks, potholes, and surface aging. To maintain the normal use of roads, partial or complete repair of the old road surface is often necessary.

[0003] In actual construction, road repair typically involves milling the old pavement and then repaving it with a new asphalt layer. This process requires a strong bond between the newly laid asphalt layer and the old pavement to prevent secondary damage caused by pavement peeling or crack propagation. However, traditional asphalt pavement overlapping methods often have some significant problems, including: weak bonding, crack formation, and complex and inconsistent construction results.

[0004] Therefore, in view of the above problems, the present invention aims to provide an improved construction method and device for the jointing of new and old asphalt pavements. By using multi-layer gradient cutting design, application of nanocomposite bonding layer materials, special compaction equipment and integrated sensors, the invention solves the shortcomings of traditional methods, enhances the bonding strength and durability of the joint between new and old pavements, and extends the service life of the road. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention discloses a construction method for overlapping new and old asphalt pavements, the specific steps of which are as follows: S1. Multi-layer gradient cutting is used on the edge of the old road surface to form a multi-layered cutting surface with different depths and widths. S2. Apply a nanocomposite bonding layer to the old road surface after multi-layer gradient cutting to meet the bonding requirements of the new and old road surfaces. S3. Use a temperature control device to preheat the old road surface; S4. Laying new road surface; S5. The new asphalt pavement is compacted using a dedicated multi-point vibratory compaction device.

[0006] Furthermore, in S1, the specific steps of the multi-layer gradient cutting are as follows: S11: Preliminary cutting, using cutting equipment to perform preliminary cutting along the edge of the old road surface to form the first-level cutting surface; S12: Layer-by-layer cutting. Based on S11, layer-by-layer cutting is performed. After layer-by-layer cutting, the depth of the cut surface gradually increases and the width gradually decreases, thus forming a gradient structure. S13. After cutting, the edges of the cut surfaces are corrected to ensure that the edges of each cut surface are flat and smooth, and to avoid poor bonding caused by uneven edges.

[0007] Furthermore, the depth and width of the first-level cut surface are adjusted according to the thickness of the newly paved asphalt pavement and the road grade.

[0008] Furthermore, the depth and width of the cut surfaces formed after the layer-by-layer cutting are precisely controlled according to the material properties and construction requirements of the newly paved asphalt pavement.

[0009] Furthermore, in S2, the nanocomposite bonding layer material uses nanoparticles and a polymer adhesive. The nanoparticles are small-diameter particles, and the nanoparticles are made of silica or alumina. The small-diameter particles penetrate into tiny cracks and gaps to form a dense physical structure. The polymer adhesive uses modified resin-based polymer materials such as epoxy resin, polyurethane, fillers, curing agents, and stabilizers.

[0010] Furthermore, in S5, the multi-point vibration compaction device employs multiple vibration heads, each of which can operate independently. The multi-point vibration compaction device also integrates an intelligent control system that monitors changes in density, temperature, thickness, and compaction in real time.

[0011] Furthermore, the intelligent control system includes a main body, on which, from top to bottom and left to right, are a temperature sensor module, a thickness sensor module, a density sensor module, and a visualization camera processing module. The density sensor module, visualization camera processing module, temperature sensor module, and thickness sensor module are all connected to sensor integrated probes. A sensor-machine connector is provided at the top of the main body, and a sensor integrated probe is provided at the tail end of the main body. The sensor-machine connector is used to connect to an external machine, and the sensor integrated probe is used to collect temperature, density, thickness, and capture on-site conditions.

[0012] Furthermore, the data collected by the intelligent control system is transmitted to an external intelligent processing system for processing, and the external intelligent processing system feeds back the processing results to the construction machinery.

[0013] Compared with the prior art, the beneficial effects of the present invention are: (1) The multi-layer gradient cutting design, the application of nanocomposite bonding layer material, the multi-point vibration compaction equipment, the use of sensors, intelligent processing center, and the implementation of temperature control construction process of the present invention significantly improve the bonding strength, durability and crack resistance of the joint between new and old pavement, extend the service life of the pavement, reduce maintenance costs, and have broad application prospects.

[0014] (2) This invention, through innovative construction methods and specialized equipment, solves the problems of weak bonding, cracking, complex construction, and unstable results in traditional asphalt pavement overlapping construction, achieving seamless connection between new and old pavements. This invention not only improves the overall performance of the pavement but also provides reliable protection for the long-term use of the road. Therefore, this invention has certain application value and market prospects, and is suitable for urban roads, highways, airport runways, and other occasions with high requirements for pavement quality. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the construction process of this invention.

[0016] Figure 2 This is a diagram showing the effect after the construction of the present invention S1.

[0017] Figure 3 This is a diagram showing the effect after the construction of the S5 method of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure of the multi-point vibration compaction device of the present invention.

[0019] Figure 5 This is a schematic diagram of the temperature control device of the present invention.

[0020] Figure 6 This is a schematic diagram of the intelligent control system structure of the present invention.

[0021] Reference numerals: 1-Sensor-machine connector; 2-Density sensor module; 3-Visual camera processing module; 4-Temperature sensor module; 5-Thickness sensor module; 6-Sensor integrated probe. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do 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 terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figure 1 As shown, a construction method for overlapping new and old asphalt pavements includes the following specific steps: S1. Multi-layer gradient cutting is used on the edge of the old road surface to form multi-layered cut surfaces of different depths and widths, creating a gradient transition structure. This increases the contact area between the new and old road surfaces, improving the bonding effect. The multi-layer gradient cutting creates a multi-layered contact surface between the new and old road surfaces, effectively increasing the bonding surface base and bonding strength. The gradient cutting structure can disperse stress, reduce stress concentration, and lower the probability of crack formation. Furthermore, the gradient cutting provides more surface area, allowing the subsequently applied nanocomposite bonding layer to penetrate and adhere better, further enhancing the bonding effect.

[0026] In S1, the specific steps of multi-layer gradient cutting are as follows: S11: Preliminary cutting. Using cutting equipment, a preliminary cut is made along the edge of the old road surface to form the first-level cut surface. The depth and width of the first-level cut surface are adjusted according to the thickness of the newly paved asphalt pavement and the road grade. S12: Layer-by-layer cutting. Based on S11, layer-by-layer cutting is carried out. The depth of the cut surface gradually increases and the width gradually decreases after each layer of cutting, thus forming a gradient structure. The depth and width of the cut surface formed after layer-by-layer cutting are precisely controlled according to the material properties and construction requirements of the newly paved asphalt pavement. S13. After cutting, the edges of the cut surfaces are corrected to ensure that the edges of each layer of cut surfaces are flat and smooth, avoiding poor bonding caused by uneven edges. Figure 2 As shown.

[0027] S2. Apply a nanocomposite bonding layer to the old road surface after multi-layer gradient cutting using a scraper or other construction tools and compact it to ensure that the material of the nanocomposite bonding layer fully penetrates into each cut surface, thereby meeting the bonding requirements of the new and old road surfaces. In S2, the nanocomposite bonding layer material uses nanoparticles and polymer adhesives. The nanoparticles are small-diameter particles. The nanoparticles are made of silica and alumina nanoparticles. The small-diameter particles penetrate into tiny cracks and pores to form a dense physical structure and form a strong chemical bond with the asphalt material. The polymer adhesive uses modified resin-based polymer materials such as epoxy resin, polyurethane, fillers, curing agents, and stabilizers.

[0028] S3. Use a temperature control device to preheat the old road surface; like Figure 5 As shown, the temperature control device includes a thermal sensor, a temperature regulation system, and an intelligent feedback control system. A probe is connected to the temperature control device, which uses the probe to achieve precise control of the asphalt temperature during construction. Before paving the new asphalt pavement, the temperature control device is used to preheat the old pavement to bring it close to the temperature of the new asphalt. During the asphalt paving process, the temperature control device monitors the temperature change between the new asphalt layer and the old pavement in real time and adjusts the temperature as necessary to ensure that the temperature difference between the two is kept within the set range.

[0029] Thermal sensors are used to monitor the temperature of newly laid asphalt and old pavement in real time. The sensors are placed in different locations in the construction area to ensure the accuracy of temperature data.

[0030] Temperature control system S4. Lay the new road surface by laying the asphalt layer on the coated old road surface.

[0031] S5. The new asphalt pavement is compacted using specialized multi-point vibratory compaction equipment. A temperature control device monitors the temperature difference between the newly laid asphalt layer and the old pavement during the compaction process, adjusting the temperature as needed to ensure the temperature difference remains within a set range. This is done after construction is completed (e.g., ...). Figure 3As shown in the figure, continue to monitor the temperature changes of the new and old road surfaces, and carry out post-construction temperature maintenance when necessary to avoid thermal stress cracks caused by sudden temperature changes. like Figure 4 , Figure 6 As shown, in S5, the multi-point vibration compaction equipment uses multiple vibration heads, each of which can work independently. Each vibration head can independently adjust the vibration frequency and vibration intensity according to the depth of the cutting surface and the material properties, thereby ensuring a uniform compaction effect on the cutting surface at different depths. The multi-point vibration compaction equipment also integrates an intelligent control system that monitors changes in density, temperature, thickness and compaction in real time.

[0032] The intelligent control system includes a main body, on which, from top to bottom and left to right, are a temperature sensor module 4, a thickness sensor module 5, a density sensor module 2, and a visualization camera processing module 3. The density sensor module 2, the visualization camera processing module 3, the temperature sensor module 4, and the thickness sensor module 5 are all connected to sensor integrated probes 6. A sensor-machine connector 1 is set at the top of the main body, and a sensor integrated probe 6 is set at the tail end of the main body. The sensor-machine connector 1 is used to connect to external machines. Temperature, density, thickness, and on-site conditions are collected through the sensor integrated probe 6. The data collected by the intelligent control system is transmitted to an external intelligent processing center for processing, and the external intelligent processing center feeds back the processing results to the construction equipment.

[0033] Application examples: In the restoration project of Xiaoqinghe North Road, a main thoroughfare in Jinan City, the multi-layer gradient cutting process of this invention was used to cut the edges of the old road surface. The construction team used specialized cutting equipment to first make a preliminary cut along the edge of the old road surface with a depth of 5 cm and a width of 10 cm, forming the first-level cutting surface. Next, layer by layer, the cutting was carried out. The second layer had a cutting depth of 7 cm and a width reduced to 7 cm, and the third layer had a cutting depth of 9 cm and a width reduced to 5 cm. Through this layer-by-layer cutting process, multiple gradient cutting surfaces were formed along the edge of the old road surface, laying a good foundation for subsequent bonding construction.

[0034] After multi-layer gradient cutting was completed, the construction team treated the gradient cutting layer with a nanocomposite bonding layer material. This material consists of nano-silica particles and modified epoxy resin. Construction workers used a scraper to evenly apply the material to the cut surface and then compacted it. The bonding layer material can deeply penetrate into the tiny gaps in the cutting layer, forming a strong physical and chemical bond, improving the adhesion between the new and old pavement.

[0035] During the compaction of the newly laid asphalt layer, the construction team used specialized multi-point vibratory compaction equipment. This equipment is equipped with two independent vibratory heads, each corresponding to a different gradient cutting layer, and can independently adjust the vibration frequency and pressure. The intelligent control system monitors the density changes of each cutting surface in real time through sensor probes and automatically adjusts vibration parameters through an intelligent central control system to ensure uniform compaction quality across the entire overlap area.

[0036] To prevent cracking caused by temperature differences between the new and old road surfaces, the construction team used a temperature control device throughout the paving and compaction process. By monitoring the temperature of the newly laid asphalt and the old road surface in real time using sensor probes, the construction workers found that the temperature difference between the two surfaces reached 8 degrees Celsius. At this point, the temperature control system automatically activated, heating the old road surface to control the temperature difference within 3 degrees Celsius, successfully avoiding the potential cracking risk caused by temperature stress concentration.

[0037] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A construction method for overlapping new and old asphalt pavements, characterized in that, The specific steps are as follows: S1. Multi-layer gradient cutting is used on the edge of the old road surface to form a multi-layered cutting surface with different depths and widths. S2. Apply a nanocomposite bonding layer to the old road surface after multi-layer gradient cutting to meet the bonding requirements of the new and old road surfaces. S3. Use a temperature control device to preheat the old road surface; S4. Laying new road surface; S5. The new asphalt pavement is compacted using a dedicated multi-point vibratory compaction device.

2. The construction method for overlapping new and old asphalt pavements as described in claim 1, characterized in that: In step S1, the specific steps of the multi-layer gradient cutting are as follows: S11: Preliminary cutting, using cutting equipment to perform preliminary cutting along the edge of the old road surface to form the first-level cutting surface; S12: Layer-by-layer cutting. Based on S11, layer-by-layer cutting is performed. After layer-by-layer cutting, the depth of the cut surface gradually increases and the width gradually decreases, thus forming a gradient structure. S13. After cutting, the edges of the cut surfaces are corrected to ensure that the edges of each cut surface are flat and smooth, and to avoid poor bonding caused by uneven edges.

3. The construction method for overlapping new and old asphalt pavements as described in claim 2, characterized in that: The depth and width of the first-level cut surface are adjusted according to the thickness of the newly paved asphalt pavement and the road grade.

4. The construction method for overlapping new and old asphalt pavements as described in claim 2, characterized in that: The depth and width of the cut surfaces formed after layer-by-layer cutting are precisely controlled according to the material properties and construction requirements of the newly paved asphalt pavement.

5. The construction method for overlapping new and old asphalt pavements as described in claim 1, characterized in that: In S2, the nanocomposite bonding layer material uses nanoparticles and a polymer adhesive. The nanoparticles are small-diameter particles, and the nanoparticles are made of silica or alumina. The small-diameter particles penetrate into tiny cracks and gaps to form a dense physical structure. The polymer adhesive uses modified resin-based polymer materials such as epoxy resin, polyurethane, fillers, curing agents, and stabilizers.

6. The construction method for overlapping new and old asphalt pavements as described in claim 5, characterized in that: In S5, the multi-point vibration compaction equipment uses multiple vibration heads, each of which can work independently. The multi-point vibration compaction equipment also integrates an intelligent control system that monitors changes in density, temperature, thickness, and compaction in real time.

7. The construction method for overlapping new and old asphalt pavements as described in claim 6, characterized in that: The intelligent control system includes a main body, on which, from top to bottom and left to right, are a temperature sensor module (4), a thickness sensor module (5), a density sensor module (2), and a visualization camera processing module (3). The density sensor module (2), the visualization camera processing module (3), the temperature sensor module (4), and the thickness sensor module (5) are all connected to a sensor integrated probe (6). A sensor-machine connector (1) is provided at the top of the main body, and a sensor integrated probe (6) is provided at the tail end of the main body. The sensor-machine connector (1) is used to connect to an external machine, and the sensor integrated probe (6) is used to collect temperature, density, thickness, and on-site conditions.

8. The construction method for overlapping new and old asphalt pavements as described in claim 7, characterized in that: The data collected by the intelligent control system is transmitted to an external intelligent processing system for processing, and the external intelligent processing system feeds back the processing results to the construction machinery.

Images