Double-layer continuous paving construction process for pavement base course

Abstract

The invention discloses a double-layer continuous paving construction process of a pavement base layer, which is applied to the technical field of construction processes and comprises the following steps: setting a lower bearing layer of the pavement base layer to be paved to be firm and smooth, and setting a paving mark; based on a preset ratio, stirring the mixture through a stirrer, and obtaining a stirred paving material; based on the laying identification, the lower bearing layer is evenly laid through a paver, and a pavement lower base layer is constructed; after the pavement lower base layer is paved, the pavement lower base layer is immediately rolled; when the pavement lower base layer is not initially set, uniformly paving the lower bearing layer on the pavement lower base layer through a paver to construct a pavement upper base layer; after the pavement upper base layer is paved, rolling is performed immediately; and after the pavement upper base layer is laid, the pavement is subjected to curing treatment. The problems that the construction period is long and weak links are prone to occurring in interlayer combination due to layered construction of the pavement base at present can be effectively solved, and the construction efficiency, the overall strength of the pavement base and the like are improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction technology, and in particular to a double-layer continuous paving construction process for a road base. Background Art

[0002] In traditional road base construction, each layer of construction needs to go through multiple links such as paving, compaction, and testing. Only after one layer is completed can the next layer be constructed. Each process restricts each other and requires a certain amount of time to complete. The cumulative result is a longer overall construction period. At the same time, if the paving speed is uneven or the paving thickness is inconsistent during the paving process, the interlayer contact will be loose; if the compaction degree is insufficient or the number of compaction passes is insufficient during the compaction process, it will not be possible to achieve a good embedding and bonding effect between the two layers. As a result, the current layered construction of the road base often leads to a long construction period and weak links between the layers. Summary of the invention

[0003] In view of the above shortcomings of the prior art, the purpose of the present invention is to disclose a double-layer continuous paving construction process for a road base to improve the relevant technical problems mentioned in the above technical background. The present invention can effectively improve the construction efficiency, speed up the construction progress, and improve the overall strength, stability and reliability of the road base.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention discloses a double-layer continuous paving construction process for a road base, which at least comprises the following steps:

[0005] Step S10, setting the lower bearing layer of the road base to be paved to be solid and flat, and setting a paving mark;

[0006] Step S20: Based on a preset ratio, the mixture is stirred by a mixer to obtain a stirred paving material;

[0007] Step S30: Based on the paving mark, the lower bearing layer is evenly paved by a paving machine to construct the lower base of the road surface;

[0008] Step S40: After the lower base of the road surface is paved, rolling is immediately performed;

[0009] Step S50: When the lower base of the road surface has not yet initially solidified, the lower bearing layer is evenly spread on the lower base of the road surface by a paver to construct an upper base of the road surface;

[0010] Step S60: After the base layer on the road surface is paved, rolling is immediately performed;

[0011] Step S70: After the upper base of the road surface is paved, the road surface is cured.

[0012] In one solution of the present invention, step S10 includes:

[0013] Step S101, inspect and accept the lower bearing layer, and if it is unqualified, repair the lower bearing layer and ensure that the lower bearing layer is solid and flat;

[0014] Step S102, setting paving marks, including setting edge lines and elevation control points, wherein the edge lines are marked with lime lines or other obvious markings, and the elevation control points are set every 10m, and the elevation of the top surface of the base layer is marked thereon.

[0015] In one solution of the present invention, step S20 includes:

[0016] Step S201, accurately weighing the amount of cement, crushed stone and water based on a preset ratio;

[0017] Step S202, mixing the cement, crushed stone and water by a mixer, and the mixing time is not less than 90 seconds;

[0018] Step S203, obtaining the stirred paving material.

[0019] In one solution of the present invention, in the step S20, it further includes:

[0020] A material moisture content laser detector and aggregate grading scanner are added at the mixer inlet to collect the crushed stone moisture content, particle size distribution data and ambient temperature in real time, and dynamically adjust the water-cement ratio through the following formula to achieve intelligent mixing control:

[0021] W adjust =W design +α(ρ actual -ρ design )+β(T ambient -T base )

[0022] Among them, W adjust is the water consumption corresponding to the adjusted water-cement ratio; W design is the water consumption corresponding to the designed water-cement ratio; ρ actual is the actual material density collected; ρ design is the design material density; T ambient is the actual ambient temperature, T base is the reference temperature; α and β are environmental compensation coefficients, which are obtained through machine learning historical data training and are used to compensate for the impact of changes in environmental factors on material properties.

[0023] In one solution of the present invention, step S30 includes:

[0024] Step S301, presetting the screed plate of the paver to 100-120 degrees Celsius in advance, and inspecting and debugging the paver;

[0025] Step S302: After the paver is in place, place the sensor on the reference line or the set elevation control point, start the paving operation and the paving speed is 2-3m / min.

[0026] In one solution of the present invention, the step S40 includes:

[0027] Step S401, performing the initial compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 1.5-2km / h;

[0028] Step S402, performing a re-compacting step, which uses a 20-25t heavy roller to vibrate and compact for 3-4 times, and the compacting speed is controlled at 2-3km / h. During the re-compacting step, the roller should overlap 1 / 3-1 / 2 of the wheel width and compact from the low side to the high side;

[0029] Step S403, executing the final compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 2-3km / h.

[0030] In one embodiment of the present invention, in step S50, the operation method of paving the upper base layer of the road surface is the same as that of paving the lower base layer of the road surface;

[0031] Before paving the upper base layer of the road surface, it is allowed to perform appropriate roughening treatment on the surface of the lower base layer of the road surface, and the roughening depth is controlled at 1-2 cm.

[0032] In one embodiment of the present invention, in step S60, the rolling order and rolling method of the upper base of the road surface are the same as those of the lower base of the road surface;

[0033] Among them, during the rolling process, the sand filling method or nuclear density meter method can be used to detect the compaction degree of the base layer in real time. The rolling can be stopped only when the compaction degree reaches more than 98% of the design requirements.

[0034] In one embodiment of the present invention, in step S70, a method of covering the geotextile and sprinkling water is adopted to ensure that the surface of the base layer is always kept moist, and the curing period is not less than 7 days.

[0035] In summary, the present invention discloses a double-layer continuous paving process for a pavement base layer, which can effectively improve construction efficiency. The double-layer continuous paving construction of the base layer reduces the interval time between layers and speeds up the construction progress. Traditional layered construction requires waiting for the lower base layer of the pavement to reach a certain strength before the upper base layer of the pavement can be constructed, while the double-layer continuous paving of the base layer can be carried out continuously, which greatly shortens the construction period. And because the double-layer continuous paving of the base layer is a continuous construction, the interlayer bonding is tighter, avoiding the problem of loose interlayer bonding that may occur in layered construction, and improving the overall strength and stability of the pavement base layer. Through precise material proportioning, paving and rolling control, the quality of the pavement base layer of the double-layer continuous paving of the base layer can be guaranteed to be uniform and consistent, meeting the design and specification requirements. By dynamically adjusting the water-cement ratio, it adapts to the real-time changes in the moisture content and particle size distribution of the raw materials, improves the uniformity and stability of the mixture, reduces the fluctuation of construction quality caused by improper proportioning, and improves the durability and reliability of the pavement base layer.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 The present invention is a schematic flow chart of a double-layer continuous paving construction process for a road base in one embodiment. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] See also Figure 1It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0041] See also Figure 1 The present invention discloses a double-layer continuous paving construction process for a road base, which can be used to improve the problems that the current layered construction of the road base often leads to a long construction period and weak links between layers. Specifically, the double-layer continuous paving construction process for the road base includes at least the following steps.

[0042] First, execute step S10, set the lower supporting layer of the road base to be laid to be solid and flat, and set a laying mark. When the lower supporting layer of the road base to be laid is solid and flat, the laying quality of the road surface can be effectively improved. Among them, in step S10, the following steps are also included.

[0043] Step S101, inspect and accept the underlying layer, and if it is unqualified, repair the underlying layer and ensure that the underlying layer is solid and flat.

[0044] Step S102, setting paving marks, including setting edge lines and elevation control points, wherein the edge lines are marked with lime lines or other obvious markings, and the elevation control points are set every 10m, and the elevation of the top surface of the base layer is marked thereon.

[0045] Specifically, a comprehensive inspection and acceptance of the underlying layer is allowed before construction to determine whether the surface flatness, compaction, deflection value and other indicators of the underlying layer must meet the design requirements. If there are local defects, such as potholes, looseness, etc., they should be repaired to ensure that the underlying layer is solid and flat. Secondly, the underlying layer is measured and laid out. According to the design documents, the edge lines and elevation control points of the base layer are accurately laid out at the construction site. Furthermore, the edge lines are marked with lime lines or other obvious markings, and elevation control points are set every 10m. They are driven into the ground with wooden stakes or steel chisels, and the elevation of the top surface of the base layer is marked on them.

[0046] Secondly, step S20, based on the preset ratio, the mixture is stirred by a mixer to obtain the stirred paving material.

[0047] It should be noted that in this embodiment, the cement-stabilized crushed stone material used for the double-layer continuous paving of the road base comprises cement, crushed stone and water as its main components. Cement, as a gelling material, undergoes a hydration reaction after adding water to generate gel substances such as hydrated calcium silicate and hydrated calcium aluminate, which wrap and bond the crushed stone particles together to form an overall structure with a certain strength.

[0048] As aggregate, crushed stone provides the skeleton support of the structure. The rationality of its gradation is crucial to the strength and stability of the base. Reasonable gradation can make the crushed stone particles interlock with each other to form a stable void structure, which can better withstand traffic loads and environmental stresses under the bonding effect of cement gel.

[0049] An appropriate amount of water can ensure the full hydration of cement, but too much or too little water will affect the performance of the mixture. Too little water will lead to incomplete cement hydration, affecting the strength of the base; too much water will cause segregation in the mixture, reducing the density and strength of the base. Therefore, the amount of water in the present invention needs to be intelligently and accurately controlled to accurately adjust the water-cement ratio to ensure that under different construction conditions, the performance of the mixture can always meet the strict requirements of the material quality of the double-layer continuous paving construction of the road base, thereby improving the overall quality and stability of the base.

[0050] Furthermore, for cement, ordinary silicate cement is used, with a strength grade of not less than 42.5, an initial setting time of not less than 3 hours, and a final setting time of not more than 6 hours. The maximum particle size of the crushed stone shall not exceed 31.5mm, the grading shall meet the requirements of the specification, and the crushing value shall not exceed 26%. And water is drinking water, and water containing harmful substances shall not be used.

[0051] Based on this, in step S20, the following steps are included.

[0052] Step S201: accurately weigh the amount of cement, crushed stone and water based on the preset ratio. Cement should be bulk cement, and the amount should be accurately controlled by an electronic metering device with an error of no more than ±1%. Crushed stone should be stacked in bins according to different particle sizes and transported to the mixer in proportion through a conveyor belt.

[0053] Step S202: Mix the cement, crushed stone and water in a mixer for no less than 90 seconds. The water addition amount can be adjusted intelligently by the intelligent mixing control system according to the weather conditions and the moisture content of the raw materials, thereby realizing dynamic adjustment of the water-cement ratio, so that the moisture content of the mixture is slightly higher than the optimal moisture content of 0.5%-1%, so as to compensate for the evaporation of water during transportation and paving.

[0054] In one solution of the present invention, in the step S20, it further includes:

[0055] A material moisture content laser detector and aggregate grading scanner are added at the mixer inlet to collect the crushed stone moisture content, particle size distribution data and ambient temperature in real time, and dynamically adjust the water-cement ratio through the following formula to achieve intelligent mixing control:

[0056] W adjust =W design +α(ρ actual -ρ design )+β(T ambient -T base )

[0057] Among them, W adjust is the water consumption corresponding to the adjusted water-cement ratio; W design is the water consumption corresponding to the designed water-cement ratio; ρ actual is the actual material density collected; ρ design is the design material density; T ambient is the actual ambient temperature, T base is the reference temperature; α and β are environmental compensation coefficients, which are obtained through machine learning historical data training and are used to compensate for the impact of changes in environmental factors on material properties.

[0058] The present invention collects key information such as the moisture content of crushed stone, particle size distribution data, and ambient temperature in real time, inputs the collected data into the dynamic ratio adjustment algorithm formula, calculates the adjusted water-cement ratio, and automatically adjusts the water addition amount and feeding speed of the mixer according to the adjusted water-cement ratio to ensure the optimal ratio of the mixture. It ensures that under different construction conditions, the performance of the mixture can always meet the strict requirements of the material quality of the double-layer continuous paving construction of the road base, and improves the overall quality and stability of the base.

[0059] Step S203, obtaining the stirred paving material.

[0060] Furthermore, step S30 is executed to evenly pave the underlying layer based on the paving mark by a paver to construct the road subbase. It should be noted that in this embodiment, a large crawler paver is used to pave the road subbase.

[0061] Based on this, in step S30, the following steps are included.

[0062] Step S301, pre-set the screed plate of the paver to 100-120 degrees Celsius, and inspect and debug the paver. By preheating the screed plate of the paver to 100-120 degrees Celsius in advance, the mixture can be effectively prevented from adhering to the screed plate.

[0063] Step S302: After the paver is in place, place the sensor on the reference line or the set elevation control point, start the paving operation and the paving speed is 2-3m / min. In the actual paving process, it is necessary to maintain a constant speed and avoid stopping or frequent speed changes. During the paving process, the operator should pay close attention to the working status of the paver, and adjust the speed and height of the spiral distributor in time to ensure that the mixture is evenly distributed and prevent segregation.

[0064] Furthermore, step S40 is executed, and after the lower base of the road surface is paved, rolling is immediately performed.

[0065] It can be understood that in the actual rolling process, multiple rolling steps are used for rolling, including an initial rolling step, a repeated rolling step and a final rolling step.

[0066] Step S401, perform the initial compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 1.5-2km / h. The initial compaction step can make the mixture initially stable, creating conditions for subsequent re-compacting and final compaction.

[0067] Step S402: Perform the recompacting step, which uses a 20-25t heavy roller to vibrate and compact 3-4 times, and the rolling speed is controlled at 2-3km / h. During the recompacting step, the roller should overlap 1 / 3-1 / 2 of the wheel width and roll from the low side to the high side. The recompacting step can effectively ensure that all parts of the base layer can be fully compacted.

[0068] Step S403, perform the final compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 2-3km / h. The final compaction step is mainly to eliminate the rolling wheel marks and make the base surface flat.

[0069] Furthermore, step S50 is performed, when the lower base of the road surface has not yet initially set, the lower bearing layer is evenly spread on the lower base of the road surface by a paver to construct an upper base of the road surface. During the paving process, care should be taken to avoid disturbing the compacted base of the lower base of the road surface. It should be noted that the operation method of paving the upper base of the road surface is the same as that of the lower base of the road surface.

[0070] Before paving the upper base of the road surface, the surface of the lower base of the road surface can be properly roughened, and the roughening depth is controlled to be 1-2 cm. The roughening treatment can prevent the structure of the lower base of the road surface from being damaged.

[0071] Furthermore, step S60 is executed, and rolling is immediately performed after the base layer on the road surface is paved.

[0072] It should be noted that the rolling sequence and rolling method of the upper base of the road surface are the same as those of the lower base of the road surface. The rolling sequence and method are the same as those of the lower base of the road surface, but during the rolling process, more attention should be paid to controlling the driving speed and rolling times of the roller to avoid the phenomenon of displacement or loosening of the base surface due to excessive rolling. In particular, during the rolling process, the sand filling method or nuclear density meter method can be used to detect the compaction degree of the base in real time. When the compaction degree reaches more than 98% of the design requirement, the rolling can be stopped.

[0073] Finally, in step S70, after the base layer on the road surface is laid, the road surface is cured. This includes covering the surface with geotextile and sprinkling water to ensure that the surface of the base layer is always kept moist, and the curing period is not less than 7 days. During the curing period, traffic should be closed and vehicles should be prohibited from passing to prevent the surface of the base layer from being damaged.

[0074] It is understandable that in the actual paving process, the surface of the base layer should be flat and dense, without obvious wheel marks, cracks, looseness and other defects. The surface flatness is tested with a 3m ruler, and 2 places × 10 feet are measured every 200m. The standard deviation of flatness is not more than 3mm. There should be no accumulation of water on the surface of the base layer, and the drainage should be smooth. After the curing period, the surface of the base layer should present a uniform color without obvious color difference to ensure the paving effect of the base layer.

[0075] At the same time, during the paving process of the road base, the compaction degree of the base should be no less than 98%, and it should be tested by sand filling method or nuclear density meter method. Test 2 locations per lane every 200m, and the compaction test results should be averaged, and the single-point compaction degree should not be less than 96% of the specified value. The flatness standard deviation is no more than 3mm, and a 3m ruler is used for testing. Measure 2 locations × 10 feet every 200m, and each location should be measured continuously for 10 feet, and the maximum value is taken as the flatness measurement value of that location. As for strength, the 7-day unconfined compressive strength should meet the design requirements, and test specimens are made through on-site sampling. Every 2000m 2 One group (6 pieces) of test specimens shall be randomly inspected. The test specimens shall be sampled and made at the construction site, and the compressive strength test shall be carried out after curing for 7 days under standard curing conditions.

[0076] Based on this, the construction principle of the double-layer continuous paving process of the pavement base provided by the present invention includes:

[0077] When constructing double-layer continuous paving of the base layer, the lower base layer of the pavement is first paved and rolled. After the paver spreads the lower base layer mixture evenly, the rolling operation is immediately carried out. The purpose of rolling is to make the lower base layer mixture of the pavement reach the specified density and provide a solid foundation for the construction of the upper base layer of the pavement. Before the lower base layer of the pavement has initially set, the upper base layer of the pavement is immediately paved and rolled. At this time, the cement in the lower base layer mixture of the pavement is still in a plastic state. After the upper base layer mixture of the pavement is spread on the lower base layer of the pavement, the lower base layer mixture of the upper pavement gradually merges into one under the action of pressure and cement hydration through the rolling action of the roller.

[0078] During the paving process, the automatic leveling device of the paver plays a key role. It uses sensors to sense the reference line or the surface of the paved underlying layer, and automatically adjusts the height of the ironing plate to ensure accurate control of the paving thickness and flatness. The rolling process adopts the principle of from light to heavy. The initial compaction uses static compaction with a light roller, mainly to stabilize the mixture initially and reduce displacement; the secondary compaction uses vibration compaction with a heavy roller, which further compacts the mixture through vibration to increase the density; the final compaction uses static compaction with a light roller, mainly to eliminate rolling wheel marks and make the surface of the base smooth.

[0079] In summary, the present invention discloses a double-layer continuous paving process for a pavement base layer, which can effectively improve construction efficiency. The double-layer continuous paving construction of the base layer reduces the interval time between layers and speeds up the construction progress. Traditional layered construction requires waiting for the lower base layer of the pavement to reach a certain strength before the upper base layer of the pavement can be constructed, while the double-layer continuous paving of the base layer can be carried out continuously, greatly shortening the construction period. And because the double-layer continuous paving of the base layer is a continuous construction, the bonding between the layers is tighter, avoiding the problem of loose interlayer bonding that may occur in layered construction, and improving the overall strength and stability of the pavement base layer. Through precise material proportioning, paving and rolling control, it can be ensured that the quality of the pavement base layer of the double-layer continuous paving of the base layer is uniform and consistent, meeting the design and specification requirements.

[0080] Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A double-layer continuous paving construction process for a road base, characterized in that: At least the steps include: Step S10, setting the lower bearing layer of the road base to be paved to be solid and flat, and setting a paving mark; Step S20: Based on a preset ratio, the mixture is stirred by a mixer to obtain a stirred paving material; Step S30: Based on the paving mark, the lower bearing layer is evenly paved by a paving machine to construct the lower base of the road surface; Step S40: After the lower base of the road surface is paved, rolling is immediately performed; Step S50: When the lower base of the road surface has not yet initially solidified, the lower bearing layer is evenly spread on the lower base of the road surface by a paver to construct an upper base of the road surface; Step S60: After the base layer on the road surface is paved, rolling is immediately performed; Step S70: After the upper base of the road surface is paved, the road surface is cured.

2. The double-layer continuous paving construction process of the road base according to claim 1 is characterized in that: In the step S10, it includes: Step S101, inspect and accept the lower bearing layer, and if it is unqualified, repair the lower bearing layer and ensure that the lower bearing layer is solid and flat; Step S102, setting paving marks, including setting edge lines and elevation control points, wherein the edge lines are marked with lime lines or other obvious markings, and the elevation control points are set every 10m, and the elevation of the top surface of the base layer is marked thereon.

3. The double-layer continuous paving construction process of the road base according to claim 1 is characterized in that: In the step S20, it includes: Step S201, accurately weighing the amount of cement, crushed stone and water based on a preset ratio; Step S202, mixing the cement, crushed stone and water by a mixer, and the mixing time is not less than 90 seconds; Step S203, obtaining the stirred paving material.

4. The double-layer continuous paving construction process of the road base according to claim 3 is characterized in that: In the step S20, it also includes: A material moisture content laser detector and aggregate grading scanner are added at the mixer inlet to collect the crushed stone moisture content, particle size distribution data and ambient temperature in real time, and dynamically adjust the water-cement ratio through the following formula to achieve intelligent mixing control: W adjust =W design +a(r actual -r design )+β(T ambient -T base ) Among them, W adjust is the water consumption corresponding to the adjusted water-cement ratio; W design is the water consumption corresponding to the designed water-cement ratio; ρ actual is the actual material density collected; ρ design is the design material density; T ambient is the actual ambient temperature, T base is the reference temperature; α and β are environmental compensation coefficients, which are obtained through machine learning historical data training and are used to compensate for the impact of changes in environmental factors on material properties.

5. The double-layer continuous paving construction process of the road base according to claim 1 is characterized in that: In the step S30, it includes: Step S301, presetting the screed plate of the paver to 100-120 degrees Celsius in advance, and inspecting and debugging the paver; Step S302: After the paver is in place, place the sensor on the reference line or the set elevation control point, start the paving operation and the paving speed is 2-3m / min.

6. The double-layer continuous paving construction process of the road base according to claim 1 is characterized in that: In the step S40, it includes: Step S401, performing the initial compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 1.5-2km / h; Step S402, performing a re-compacting step, which uses a 20-25t heavy roller to vibrate and compact for 3-4 times, and the compacting speed is controlled at 2-3km / h. During the re-compacting step, the roller should overlap 1 / 3-1 / 2 of the wheel width and compact from the low side to the high side; Step S403, executing the final compaction step, which uses a 10-12t light roller to perform static compaction 1-2 times, and the compaction speed is controlled at 2-3km / h.

7. The double-layer continuous paving construction process for the road base according to claim 1 is characterized in that: In the step S50, the operation method of paving the upper base layer of the road surface is the same as that of paving the lower base layer of the road surface; Before paving the upper base layer of the road surface, it is allowed to perform appropriate roughening treatment on the surface of the lower base layer of the road surface, and the roughening depth is controlled at 1-2 cm.

8. The double-layer continuous paving construction process for the road base according to claim 1 is characterized in that: In the step S60, the rolling order and rolling method of the upper base of the road surface are the same as those of the lower base of the road surface; Among them, during the rolling process, the sand filling method or nuclear density meter method can be used to detect the compaction degree of the base layer in real time. The rolling can be stopped only when the compaction degree reaches more than 98% of the design requirements.

9. The double-layer continuous paving construction process of the road base according to claim 1 is characterized in that: In the step S70, a method of covering the geotextile and sprinkling water is adopted to ensure that the surface of the base layer is always kept moist, and the curing period is not less than 7 days.

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