Road engineering construction method

Abstract

The invention relates to the technical field of road engineering, in particular to a road engineering construction method which comprises the following steps: S1, roadbed treatment: firstly, cleaning and trimming a roadbed, removing vegetation, tree roots, garbage and organic soil on the surface layer by using a bulldozer and an excavator, and maintaining the cleaning depth at 10-15cm; and then a land leveler is used for being matched with manual operation to level the cleaned roadbed, and it is ensured that the surface is flat. According to the method, the flatness of the foundation pavement is optimized by controlling the roadbed cleaning depth and applying mechanical equipment, and the construction quality and speed of subsequent procedures are improved. And the uniformity and the structural strength of the foundation are ensured through accurate measurement of the compactness and timely pressure supplementing operation, and the bearing capacity of the road is improved. By adjusting the water content and compaction parameters, the stability and waterproofness of the gravel base are enhanced, the service life of the road is prolonged, and the cost of later maintenance is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering, and in particular to a road engineering construction method. Background Art

[0002] Road construction mainly involves the techniques and steps used in the actual construction process to ensure the correct implementation of the road project from infrastructure construction to the final form. These methods include the preparation of the roadbed, the selection and processing of materials, paving techniques, and subsequent maintenance and maintenance measures. The selection and application of construction methods have a decisive influence on the quality, safety and life of the road. Effective construction technology not only improves the use function and carrying capacity of the road, but also helps to reduce maintenance costs and extend the service life of the road.

[0003] A patent application with Chinese patent publication number CN113944078A discloses a road construction method for municipal engineering, which includes the following steps: S1, construction preparation: select the corresponding construction section, first conduct construction measurement on the section, then construct and support the section to be excavated, and after the support is completed, use the excavation equipment to clear the site of the section; S2, roadbed filling: when filling with materials of different properties, operate by horizontal layered filling method, pour soil materials of different densities, and different specifications of gravel and limestone produced by industrial waste into the road surface in turn, and spread it by a paver; S3, roadbed compaction: according to the soil material, correctly select compaction equipment, master the loose paving thickness and rolling number of different equipment, and when compaction is implemented, the roller used should follow the principle of light first and heavy later, and the rolling speed should be slow first and fast later; S4, asphalt construction: on the basis of the compacted roadbed, asphalt construction is carried out on the surface of the section. Although this construction method can avoid the impact of external factors on the road section by filling the construction section horizontally in layers, this construction method lacks density detection and material processing, resulting in unevenness of the base layer, affecting the overall performance and safety of the road. At the same time, the lack of effective curing and permeable oil treatment measures affects the durability and functionality of the road. These deficiencies may cause settlement, cracks and water damage to the road during use, increase maintenance frequency and costs, and affect the service life of the road and driving safety. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a road engineering construction method.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme, a road engineering construction method, comprising the following steps: S1, roadbed treatment, first clean and trim the roadbed, use bulldozers and excavators to remove surface vegetation, tree roots, garbage and organic soil, and maintain the cleaning depth at 10-15 cm, then use a grader to level the cleaned roadbed with manual work to ensure the surface is flat, and then use the ring knife method or nuclear density meter to test the density of the roadbed to ensure that the density is between 90% and 95% of the design requirements. The insufficient part needs to be filled up to the standard to obtain a qualified roadbed; S2, base paving and rolling, gravel base is laid on the qualified roadbed, gravel is selected, the paving thickness is maintained at 25-35 cm, the loose paving thickness is calculated according to the loose paving coefficient, shovel truck and bulldozer are used for even paving, and watering and rolling operations are carried out, and 18-20 ton vibratory roller is used to compact the gravel base to the design requirement of 95%-98% compaction degree; S3, construction and maintenance of the middle layer, laying cement-stabilized gravel base, the cement dosage in the mixture is 4%-6%, the particle size is in the range of 0.5-4 cm, and the paving thickness is set to 18-22 cm. After paving, use an 18-20 ton vibratory roller to roll according to the principle of light first and heavy later and slow first and fast later. The number of rolling times is maintained at 6-8 times, and the speed is controlled at 2-4 km / h to form a compacted base. After the thickness and compaction degree of the completed base are tested, straw mats and curing blankets are used for 7-10 days of curing treatment to obtain a cured cement-stabilized gravel base; S4, surface layer construction, spray penetration oil on the cured cement stabilized gravel base, use PC-2 penetration oil, the dosage is 0.8-1.2 liters / square meter, the spreading temperature is controlled at 50-70 degrees Celsius, after spraying, lay medium-grained asphalt concrete AC-16, the asphalt content is controlled at 4.5%-5.5%, the paving thickness is 5-7 cm, use a paver for paving, the paving temperature is maintained at 130-150 degrees Celsius, and finally use a 12-15 ton vibratory roller for initial and re-compaction to complete the compacted AC-16 asphalt concrete layer.

[0006] Preferably, the S1 comprises: S101, clean and trim the roadbed. Use bulldozers and excavators to clean the roadbed on site, including removing surface vegetation, tree roots, garbage and organic soil, with a cleaning depth of 10-15 cm. Use a grader to level the cleaned roadbed manually to make its surface flat, and the longitudinal and transverse slopes meet the design requirements, so as to obtain a cleaned and leveled roadbed. S102, performing a density test on the cleaned and leveled roadbed, using a ring knife method or a nuclear density meter to test the roadbed, with a test point spacing of 20-30 meters, and the density should reach 90%-95% of the design requirement; if the density is insufficient, performing a re-compacting treatment until the density meets the requirement, thereby obtaining a roadbed with qualified density; S103, paving a gravel base layer on the roadbed with qualified density, using gravel with a paving thickness of 25-35 cm, and calculating the loose paving thickness according to a loose paving coefficient of 1.15-1.25; using a forklift and a bulldozer to spread the gravel so that the thickness and the cross slope of the gravel are uniform, thereby obtaining a paved gravel base layer.

[0007] Preferably, the S2 comprises: S201, watering and rolling the paved gravel base, using a watering truck to water the gravel according to the water content of the gravel, and then using an 18-20 ton vibratory roller to roll the gravel base to obtain a dense gravel base; S202, testing the thickness and compaction of the dense gravel base, using a sampling method to test the base thickness, with a testing interval of 50 meters, and controlling the thickness deviation within ±1 cm; using a ring knife method or a nuclear density meter to test the compaction, and the compaction should reach 95%-98% of the design requirements; after passing the test, a gravel base with quality that meets the requirements is obtained; S203, laying a cement-stabilized crushed stone base layer on the gravel base layer that meets the quality requirements, the mixed cement-stabilized crushed stone has a cement dosage of 4%-6%, a particle size range of 0.5-4 cm, and a paving thickness of 18-22 cm; using a paver for paving, controlling the loose paving coefficient to 1.2-1.3, to obtain a paved cement-stabilized crushed stone base layer.

[0008] Preferably, the S3 includes: S301, rolling the paved cement-stabilized gravel base using an 18-20 ton vibratory roller; the rolling follows the principle of light first then heavy and slow first then fast, the number of rolling times is 6-8 times, and the rolling speed is 2-4 km / h, to obtain a compacted cement-stabilized gravel base; S302, testing the thickness and compaction degree of the compacted cement-stabilized crushed stone base, using the core drilling method to test the base thickness, with a testing interval of 50 meters and a thickness deviation controlled within ±1 cm; using the ring knife method or a nuclear density meter to test the compaction degree, which should reach 98%-100% of the design requirement; after the test is qualified, a cement-stabilized crushed stone base with quality that meets the requirements is obtained; S303, curing the cement-stabilized gravel base layer that meets the quality requirements, using a double-layer curing method of covering with straw mats and curing blankets to keep the surface moist, and the curing period is 7-10 days; watering is performed 2-4 times a day during this period to ensure the normal development of the base layer strength, so as to obtain a cured cement-stabilized gravel base layer.

[0009] Preferably, the S4 includes: S401, spraying a penetrating oil on the cured cement-stabilized crushed stone base, using PC-2 penetrating oil, with a spraying amount of 0.8-1.2 liters / square meter, using a spraying vehicle to spray evenly, and a spraying temperature of 50-70 degrees Celsius; after spraying, wait for the penetrating oil to fully penetrate into the base to obtain a base surface sprayed with the penetrating oil; S402, paving medium-grained asphalt concrete AC-16 on the surface of the base layer sprayed with the penetration oil, using an asphalt mixture with an asphalt content of 4.5%-5.5% and a paving thickness of 5-7 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-16 asphalt concrete layer; S403, rolling the paved AC-16 asphalt concrete layer, using a 12-15 ton vibratory roller for initial and re-compacting, with a compaction temperature of 120-140 degrees Celsius; the number of rolling times is 6-8 times, and the rolling speed is 2-4 kilometers per hour; the final compaction is performed using an 8-10 ton steel wheel roller, and the rolling temperature is not less than 70 degrees Celsius, to obtain a compacted AC-16 asphalt concrete layer.

[0010] Preferably, the method further includes: S5, testing the compacted AC-16 asphalt concrete layer to detect thickness, flatness and compaction, with the thickness deviation controlled within ±0.5 cm and the compaction reaching 96%-98%; after the test is qualified, an AC-16 asphalt concrete layer that meets the quality requirements is obtained.

[0011] Preferably, the method further includes: S6, spraying tack coat oil on the AC-16 asphalt concrete layer that meets the quality requirements, using fast-cracking emulsified asphalt, with a spreading amount of 0.3-0.6 liters / square meter, using a spreader to spray evenly, and a spreading temperature of 50-70 degrees Celsius; after spraying, wait for the tack coat oil to fully demulsify to obtain an asphalt layer surface sprayed with tack coat oil.

[0012] Preferably, the method further includes: S7, paving fine-grained colored asphalt concrete AC-13 on the surface of the asphalt layer sprayed with the tack coat oil, using a colored asphalt mixture with an asphalt content of 5%-6% and a paving thickness of 3-5 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-13 colored asphalt concrete layer.

[0013] Preferably, in step S201, the rolling is performed 6-8 times at a rolling speed of 2-4 km / h until the surface is smooth without obvious wheel marks.

[0014] Preferably, in step S103, the particle size of the gravel material is in the range of 0.5-5 cm.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: In the present invention, the control of the roadbed cleaning depth and the application of mechanical equipment optimize the flatness of the basic road surface and improve the construction quality and speed of subsequent processes. The precise measurement of density and timely pressure replenishment operations ensure the uniformity and structural strength of the foundation and improve the bearing capacity of the road. By adjusting the water content and compaction parameters, the stability and waterproofness of the gravel base layer are enhanced, which prolongs the service life of the road and reduces the cost of subsequent maintenance. The fine curing and penetration oil treatment of cement-stabilized crushed stone and asphalt concrete layers further optimize the material properties and improve the durability and fatigue resistance of the road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the steps of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] See also Figure 1 The present invention provides a technical solution, a road engineering construction method, comprising the following steps: S1, roadbed treatment, first clean and trim the roadbed, use bulldozers and excavators to remove surface vegetation, tree roots, garbage and organic soil, and maintain the cleaning depth at 10-15 cm, then use a grader to level the cleaned roadbed with manual work to ensure the surface is flat, and then use the ring knife method or nuclear density meter to test the density of the roadbed to ensure that the density is between 90% and 95% of the design requirements. The insufficient part needs to be filled up to the standard to obtain a qualified roadbed; S2, base paving and rolling, gravel base is laid on the qualified roadbed, gravel is selected, the paving thickness is maintained at 25-35 cm, the loose paving thickness is calculated according to the loose paving coefficient, shovel truck and bulldozer are used for even paving, and watering and rolling operations are carried out, and 18-20 ton vibratory roller is used to compact the gravel base to the design requirement of 95%-98% compaction degree; S3, construction and maintenance of the middle layer, laying cement-stabilized gravel base, the cement dosage in the mixture is 4%-6%, the particle size is in the range of 0.5-4 cm, and the paving thickness is set to 18-22 cm. After paving, use an 18-20 ton vibratory roller to roll according to the principle of light first and heavy later and slow first and fast later. The number of rolling times is maintained at 6-8 times, and the speed is controlled at 2-4 km / h to form a compacted base. After the thickness and compaction degree of the completed base are tested, straw mats and curing blankets are used for 7-10 days of curing treatment to obtain a cured cement-stabilized gravel base; S4, surface layer construction, spray penetration oil on the cured cement stabilized gravel base, use PC-2 penetration oil, the dosage is 0.8-1.2 liters / square meter, the spreading temperature is controlled at 50-70 degrees Celsius, after spraying, lay medium-grained asphalt concrete AC-16, the asphalt content is controlled at 4.5%-5.5%, the paving thickness is 5-7 cm, use a paver for paving, the paving temperature is maintained at 130-150 degrees Celsius, and finally use a 12-15 ton vibratory roller for initial and re-compaction to complete the compacted AC-16 asphalt concrete layer.

[0019] In this embodiment, S1 includes: S101, clean and trim the roadbed. Use bulldozers and excavators to clean the roadbed on site, including removing surface vegetation, tree roots, garbage and organic soil, with a cleaning depth of 10-15 cm. Use a grader to level the cleaned roadbed manually to make its surface flat, and the longitudinal and transverse slopes meet the design requirements, so as to obtain a cleaned and leveled roadbed. The first thing to do is to clean and level the roadbed. Before this step starts, the bulldozer and excavator work together to carry out preliminary cleaning of the site, with the aim of removing surface vegetation, tree roots, garbage and organic soil. During the cleaning process, the main function of the bulldozer is to remove larger areas of impurities and topsoil, while the excavator is used to deal with tree roots and large impurities that are more difficult to dig, ensuring that the cleaning depth reaches 10-15 cm to meet the basic requirements of subsequent construction. Then, the grader is used to level the cleaned surface, and manual adjustments are made to ensure that the roadbed surface is flat and unobstructed, and the longitudinal and transverse slopes meet the design requirements. After the leveling work is completed, a flat and uniformly structured base will be formed, providing a solid foundation for subsequent construction, while ensuring the normal guidance of water flow and the service life of the road.

[0020] S102, conduct density test on the cleaned and leveled roadbed, use the ring knife method or nuclear density meter to test the density of the roadbed, the test point spacing is 20-30 meters, and the density should reach 90%-95% of the design requirements; if the density is insufficient, perform additional pressure treatment until the density meets the requirements and obtain a roadbed with qualified density; The focus is on the density test and necessary pressure supplementation of the leveled roadbed. This step uses the ring knife method or nuclear density meter to measure the density, which is to measure the weight and volume of the compacted soil to assess whether its density reaches the design requirement of 90%-95%. The spacing between the test points is maintained at 20-30 meters to ensure comprehensive and accurate density data. If the density is found to be insufficient, a heavy roller is used for pressure supplementation until the required standard is reached. Through this process, it can be ensured that the roadbed has sufficient bearing capacity and stability, providing solid support for the laying of the superstructure, while reducing the risk of settlement and damage to the road surface in the future.

[0021] S103, lay a gravel base on the roadbed with qualified density, using gravel with a paving thickness of 25-35 cm. Calculate the loose paving thickness according to the loose paving coefficient of 1.15-1.25; use a forklift and a bulldozer to spread the gravel so that the thickness and cross slope of the gravel are uniform, and obtain a paved gravel base.

[0022] Laying the gravel base is a key step. In this step, select gravel with a gradation that meets the design requirements to ensure the quality and function of the paving materials. When calculating the paving thickness, determine the loose paving thickness based on the loose paving coefficient of 1.15-1.25 to ensure that the designed thickness of 25-35 cm is reached after actual compaction. Use a shovel and bulldozer to spread the material evenly, pay attention to the flatness and thickness consistency of the material, and ensure the uniformity of the cross slope, which is crucial for subsequent drainage and vehicle driving safety. After completing this step, a uniform and stable gravel base will be formed, laying a good foundation for the subsequent rolling operation.

[0023] In this embodiment, S2 includes: S201, watering and rolling the paved gravel base, using a watering truck to water the gravel according to its water content, and then rolling it with an 18-20 ton vibrating roller to obtain a dense gravel base; The last step is to water and roll the laid gravel base. In this step, a watering truck is used to spray water according to the actual water content of the gravel, in order to adjust the water content of the gravel to achieve the best compaction effect. Then a 18-20 ton vibrating roller is used to roll the gravel base several times to ensure that the density of the gravel base is uniform. After this step, the gravel base will have high density and good bearing capacity, which provides guarantee for the stability and durability of the road. Through this series of precisely controlled construction processes, the quality of the road project and the reliability of long-term use are ensured.

[0024] S202, the thickness and compaction degree of the dense gravel base layer are tested. The thickness of the base layer is tested by sampling method, the testing interval is 50 meters, and the thickness deviation is controlled within ±1 cm; the compaction degree is tested by ring knife method or nuclear density meter, and the compaction degree should reach 95%-98% of the design requirements; after passing the test, the gravel base layer that meets the quality requirements is obtained; The thickness and compaction of the laid gravel base are accurately tested. This step first uses the sampling method to detect the thickness of the base, ensuring that a test point is set up every 50 meters, and the thickness deviation is controlled within ±1 cm through actual measurement. The key to this precision control is to ensure the uniformity of the entire base and meet the design specifications, so as to avoid instability and damage in future road use due to uneven thickness. Subsequently, the ring knife method or nuclear density meter is used to determine the compaction, requiring the compaction to reach 95%-98%. Through the set test point spacing, the entire construction area is fully covered to ensure that each section meets the construction standards. After the test is qualified, this step generates a detailed compaction and thickness test report, which records the data of each test point, provides a basis for subsequent construction, and ensures the quality control foundation of the subsequent construction layer.

[0025] S203, lay a cement-stabilized crushed stone base on a gravel base that meets the quality requirements. The mixed cement-stabilized crushed stone has a cement dosage of 4%-6%, a particle size range of 0.5-4 cm, and a paving thickness of 18-22 cm. Use a paver for paving, control the loose paving coefficient to 1.2-1.3, and obtain a paved cement-stabilized crushed stone base.

[0026] Lay the cement-stabilized gravel base. The first step in this step is to mix the cement-stabilized gravel. The cement dosage is controlled at 4%-6%, and the particle size range is set to 0.5-4 cm to meet the requirements of structural strength and workability. Use a paver for paving work, control the loose paving coefficient between 1.2-1.3, and ensure that the paving thickness is 18-22 cm. This series of operations ensures the uniformity and stability of the cement-stabilized gravel base, provides sufficient support strength, and prevents cracks and settlement in subsequent roads. After paving is completed, a uniform and stable cement-stabilized gravel base is formed, providing a solid foundation for the upper paving.

[0027] In this embodiment, S3 includes: S301, rolling the paved cement-stabilized gravel base using a 18-20 ton vibratory roller; the rolling follows the principle of light first then heavy and slow first then fast, the number of rolling times is 6-8 times, the rolling speed is 2-4 km / h, and a compacted cement-stabilized gravel base is obtained; The newly laid cement-stabilized gravel base is rolled. An 18-20 ton vibratory roller is used. The rolling is carried out according to the principle of light first and heavy later, slow first and fast later, to ensure the uniformity and effectiveness of the rolling. The number of rolling passes is controlled at 6-8 times, and the rolling speed is set at 2-4 kilometers per hour. Such operating standards are designed to ensure that the cement-stabilized gravel base is compacted and formed to achieve the required density and load-bearing capacity. After completing this step, the formed base is not only dense and uniform, but also has good load-bearing capacity, which effectively prevents future deformation and damage of the road.

[0028] S302, the thickness and compaction degree of the compacted cement-stabilized crushed stone base are tested. The core drilling method is used to test the base thickness. The test interval is 50 meters, and the thickness deviation is controlled within ±1 cm. The ring knife method or nuclear density meter is used to test the compaction degree. The compaction degree should reach 98%-100% of the design requirements. After passing the test, the cement-stabilized crushed stone base with quality that meets the requirements is obtained; The thickness and compaction of the cement stabilized gravel base are tested again in detail. In this step, the core drilling method is used to detect the thickness of the base, and detection points are set every 50 meters to ensure that the thickness of the entire base is within the deviation range of ±1 cm. At the same time, the ring knife method or nuclear density meter is used to measure the compaction, and the compaction is required to reach 98%-100%. This high-standard testing process ensures that the quality of the base meets the design requirements and provides a guarantee for the stability and durability of the entire road system. After completing these tests, the generated quality inspection report records various indicators in detail to ensure that all construction links meet the design and safety specifications.

[0029] S303, cure the cement-stabilized gravel base that meets the quality requirements, using a double-layer curing method of covering with straw mats and curing blankets to keep the surface moist. The curing period is 7-10 days; water is sprinkled 2-4 times a day during this period to ensure the normal development of the base strength and obtain a cured cement-stabilized gravel base.

[0030] The curing of the cement stabilized gravel base is performed. This step adopts a double-layer curing method of covering straw mats and curing blankets. The curing period is limited to 7 to 10 days by continuously keeping the surface moist. During this period, even watering is required 2 to 4 times a day to ensure that the strength of the base can develop normally in a controlled environment. This curing method is selected based on its ability to effectively maintain the moisture of the base and prevent uneven strength caused by excessive cement hydration reaction. After the curing is completed, the cement component of the base reaches the expected hardening degree, providing a solid and stable support for the upper structure. In addition, after completing this step, a curing report will be formed to record the detailed curing process, which not only records the details of the operations during the curing period, but also verifies the final quality of the structure.

[0031] In this embodiment, S4 includes: S401, spraying penetrating oil on the cured cement-stabilized crushed stone base, using PC-2 penetrating oil, with a spreading amount of 0.8-1.2 liters / square meter, using a sprayer to spray evenly, and the spraying temperature is 50-70 degrees Celsius; after spraying, wait for the penetrating oil to fully penetrate into the base to obtain a base surface sprayed with penetrating oil; The surface of the cement stabilized macadam base that has been cured is sprayed with penetrating oil. PC-2 penetrating oil is used in this step, and it is evenly sprayed using a spreader at a dosage of 0.8 to 1.2 liters per square meter. The spraying temperature is controlled at 50 to 70 degrees Celsius to ensure that the penetrating oil can effectively penetrate into the base at a suitable temperature and improve the adhesion. The sprayed penetrating oil fully penetrates into the base to form a surface with good adhesion and waterproof layer. The key to this treatment step is to ensure that the layers to be laid in the future are more tightly bonded to prevent moisture intrusion, thereby extending the service life of the road.

[0032] S402, paving medium-grained asphalt concrete AC-16 on the surface of the base layer sprayed with the penetration oil, using an asphalt mixture with an asphalt content of 4.5%-5.5% and a paving thickness of 5-7 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-16 asphalt concrete layer; The AC-16 medium-grained asphalt concrete is paved. The asphalt mixture used is configured with an asphalt content of 4.5% to 5.5%, and the mineral aggregate gradation meets the requirements of the specification. The paving thickness is set to 5 to 7 cm, and the paving is carried out using a paver, and the paving temperature is controlled at 130 to 150 degrees Celsius. This temperature range is to ensure that the asphalt mixture can maintain good fluidity and workability during the paving process, thereby forming a uniform and thick asphalt layer. After completing this step, the AC-16 asphalt concrete layer obtained will have good initial bearing capacity and crack resistance, providing a high-quality driving surface for the road.

[0033] S403, the paved AC-16 asphalt concrete layer is rolled using a 12-15 ton vibratory roller for initial and re-compacting at a temperature of 120-140 degrees Celsius; the number of rolling passes is 6-8 times at a rolling speed of 2-4 kilometers per hour; the final rolling is performed using an 8-10 ton steel wheel roller at a rolling temperature of not less than 70 degrees Celsius to obtain a compacted AC-16 asphalt concrete layer.

[0034] The newly laid AC-16 asphalt concrete layer is rolled. This step uses a 12 to 15 ton vibratory roller for initial and re-compacting, and the rolling temperature is maintained at 120 to 140 degrees Celsius to ensure that the asphalt mixture can be fully compacted at a higher temperature. The number of rolling passes is controlled at 6 to 8 times, and the rolling speed is 2 to 4 kilometers per hour. The final rolling is carried out using an 8 to 10 ton steel wheel roller, and the rolling temperature is not less than 70 degrees Celsius. These rolling parameters ensure that the AC-16 asphalt concrete layer is compacted and formed to form a uniform and dense road surface. After completing this step, the road has excellent bearing capacity and anti-deformation ability, which effectively extends the service life of the road.

[0035] In this embodiment, it also includes: S5, testing the compacted AC-16 asphalt concrete layer to test the thickness, flatness and compaction, the thickness deviation is controlled within ±0.5 cm, and the compaction reaches 96%-98%; after passing the test, an AC-16 asphalt concrete layer that meets the quality requirements is obtained.

[0036] In this embodiment, it also includes: S6, spraying tack coat oil on the AC-16 asphalt concrete layer that meets the quality requirements, using fast-cracking emulsified asphalt, with a spreading amount of 0.3-0.6 liters / square meter, using a spreader to spray evenly, and a spreading temperature of 50-70 degrees Celsius; after spraying, wait for the tack coat oil to fully demulsify to obtain the asphalt layer surface sprayed with tack coat oil.

[0037] In this embodiment, it also includes: S7, paving fine-grained colored asphalt concrete AC-13 on the surface of the asphalt layer sprayed with tack coat oil, using a colored asphalt mixture with an asphalt content of 5%-6% and a paving thickness of 3-5 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-13 colored asphalt concrete layer.

[0038] In this embodiment, in step S201, the number of rolling passes is 6-8 times, and the rolling speed is 2-4 kilometers per hour, until the surface is flat and there are no obvious wheel marks.

[0039] In this embodiment, in step S103, the particle size of the gravel material ranges from 0.5 to 5 cm.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A road engineering construction method, characterized in that: The following steps are involved: S1, roadbed treatment, first clean and trim the roadbed, use bulldozers and excavators to remove surface vegetation, tree roots, garbage and organic soil, and maintain the cleaning depth at 10-15 cm, then use a grader to level the cleaned roadbed with manual work to ensure the surface is flat, and then use the ring knife method or nuclear density meter to test the density of the roadbed to ensure that the density is between 90% and 95% of the design requirements. The insufficient part needs to be filled up to the standard to obtain a qualified roadbed; S2, base paving and rolling, gravel base is laid on the qualified roadbed, gravel is selected, the paving thickness is maintained at 25-35 cm, the loose paving thickness is calculated according to the loose paving coefficient, shovel truck and bulldozer are used for even paving, and watering and rolling operations are carried out, and 18-20 ton vibratory roller is used to compact the gravel base to the design requirement of 95%-98% compaction degree; S3, construction and maintenance of the middle layer, laying cement-stabilized gravel base, the cement dosage in the mixture is 4%-6%, the particle size is in the range of 0.5-4 cm, and the paving thickness is set to 18-22 cm. After paving, use an 18-20 ton vibratory roller to roll according to the principle of light first and heavy later and slow first and fast later. The number of rolling times is maintained at 6-8 times, and the speed is controlled at 2-4 km / h to form a compacted base. After the thickness and compaction degree of the completed base are tested, straw mats and curing blankets are used for 7-10 days of curing treatment to obtain a cured cement-stabilized gravel base; S4, surface layer construction, spray penetration oil on the cured cement stabilized gravel base, use PC-2 penetration oil, the dosage is 0.8-1.2 liters / square meter, the spreading temperature is controlled at 50-70 degrees Celsius, after spraying, lay medium-grained asphalt concrete AC-16, the asphalt content is controlled at 4.5%-5.5%, the paving thickness is 5-7 cm, use a paver for paving, the paving temperature is maintained at 130-150 degrees Celsius, and finally use a 12-15 ton vibratory roller for initial and re-compaction to complete the compacted AC-16 asphalt concrete layer.

2. The road engineering construction method according to claim 1, characterized in that: The S1 includes: S101, clean and trim the roadbed. Use bulldozers and excavators to clean the roadbed on site, including removing surface vegetation, tree roots, garbage and organic soil, with a cleaning depth of 10-15 cm. Use a grader to level the cleaned roadbed manually to make its surface flat, and the longitudinal and transverse slopes meet the design requirements, so as to obtain a cleaned and leveled roadbed. S102, performing a density test on the cleaned and leveled roadbed, using a ring knife method or a nuclear density meter to test the roadbed, with a test point spacing of 20-30 meters, and the density should reach 90%-95% of the design requirement; if the density is insufficient, performing a re-compacting treatment until the density meets the requirement, thereby obtaining a roadbed with qualified density; S103, paving a gravel base layer on the roadbed with qualified density, using gravel with a paving thickness of 25-35 cm, and calculating the loose paving thickness according to a loose paving coefficient of 1.15-1.25; using a forklift and a bulldozer to spread the gravel so that the thickness and the cross slope of the gravel are uniform, thereby obtaining a paved gravel base layer.

3. The road engineering construction method according to claim 1, characterized in that: The S2 includes: S201, watering and rolling the paved gravel base, using a watering truck to water the gravel according to the water content of the gravel, and then using an 18-20 ton vibratory roller to roll the gravel base to obtain a dense gravel base; S202, testing the thickness and compaction of the dense gravel base, using a sampling method to test the base thickness, with a testing interval of 50 meters, and controlling the thickness deviation within ±1 cm; using a ring knife method or a nuclear density meter to test the compaction, and the compaction should reach 95%-98% of the design requirements; after passing the test, a gravel base with quality that meets the requirements is obtained; S203, laying a cement-stabilized crushed stone base layer on the gravel base layer that meets the quality requirements, the mixed cement-stabilized crushed stone has a cement dosage of 4%-6%, a particle size range of 0.5-4 cm, and a paving thickness of 18-22 cm; using a paver for paving, controlling the loose paving coefficient to 1.2-1.3, to obtain a paved cement-stabilized crushed stone base layer.

4. The road engineering construction method according to claim 1, characterized in that: The S3 includes: S301, rolling the paved cement-stabilized gravel base using an 18-20 ton vibratory roller; the rolling follows the principle of light first then heavy and slow first then fast, the number of rolling times is 6-8 times, and the rolling speed is 2-4 km / h, to obtain a compacted cement-stabilized gravel base; S302, testing the thickness and compaction degree of the compacted cement-stabilized crushed stone base, using the core drilling method to test the base thickness, with a testing interval of 50 meters and a thickness deviation controlled within ±1 cm; using the ring knife method or a nuclear density meter to test the compaction degree, which should reach 98%-100% of the design requirement; after the test is qualified, a cement-stabilized crushed stone base with quality that meets the requirements is obtained; S303, curing the cement-stabilized gravel base layer that meets the quality requirements, using a double-layer curing method of covering with straw mats and curing blankets to keep the surface moist, and the curing period is 7-10 days; watering is performed 2-4 times a day during this period to ensure the normal development of the base layer strength, so as to obtain a cured cement-stabilized gravel base layer.

5. The road engineering construction method according to claim 1, characterized in that: The S4 includes: S401, spraying a penetrating oil on the cured cement-stabilized crushed stone base, using PC-2 penetrating oil, with a spraying amount of 0.8-1.2 liters / square meter, using a spraying vehicle to spray evenly, and a spraying temperature of 50-70 degrees Celsius; after spraying, wait for the penetrating oil to fully penetrate into the base to obtain a base surface sprayed with the penetrating oil; S402, paving medium-grained asphalt concrete AC-16 on the surface of the base layer sprayed with the penetration oil, using an asphalt mixture with an asphalt content of 4.5%-5.5% and a paving thickness of 5-7 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-16 asphalt concrete layer; S403, rolling the paved AC-16 asphalt concrete layer, using a 12-15 ton vibratory roller for initial and re-compacting, with a compaction temperature of 120-140 degrees Celsius; the number of rolling times is 6-8 times, and the rolling speed is 2-4 kilometers per hour; the final compaction is performed using an 8-10 ton steel wheel roller, and the rolling temperature is not less than 70 degrees Celsius, to obtain a compacted AC-16 asphalt concrete layer.

6. The road engineering construction method according to claim 1, characterized in that: Also includes: S5, testing the compacted AC-16 asphalt concrete layer to check thickness, flatness and compaction, with thickness deviation controlled within ±0.5 cm and compaction reaching 96%-98%; after passing the test, an AC-16 asphalt concrete layer that meets the quality requirements is obtained.

7. The road engineering construction method according to claim 6, characterized in that: Also includes : S6, spraying tack coat oil on the AC-16 asphalt concrete layer that meets the quality requirements, using fast-cracking emulsified asphalt, with a spreading amount of 0.3-0.6 liters / square meter, using a spreading vehicle to spray evenly, and a spreading temperature of 50-70 degrees Celsius; after spraying, wait for the tack coat oil to fully demulsify to obtain the asphalt layer surface sprayed with tack coat oil.

8. The road engineering construction method according to claim 7, characterized in that: Also includes: S7, paving fine-grained colored asphalt concrete AC-13 on the surface of the asphalt layer sprayed with tack coat oil, using a colored asphalt mixture with an asphalt content of 5%-6% and a paving thickness of 3-5 cm; using a paver for paving at a paving temperature of 130-150 degrees Celsius to obtain a paved AC-13 colored asphalt concrete layer.

9. The road engineering construction method according to claim 3, characterized in that: In step S201, the rolling is performed 6-8 times at a speed of 2-4 km / h until the surface is flat and has no obvious wheel marks.

10. The road engineering construction method according to claim 2, characterized in that: In step S103, the particle size of the gravel material is in the range of 0.5-5 cm.

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