CN116607371A - Base layer and lower surface layer paving compaction method for highway asphalt pavement construction - Google Patents

Abstract

The invention discloses a method for paving and compacting the base layer and the underlying layer used for highway asphalt pavement construction, comprising the following steps: preparing for construction according to the site of the underlying layer to be paved; Construction lofting; according to the layered paving of the base layer and the large-thickness paving of the base layer, the formwork is erected separately; the mixture is prepared, transported and unloaded to the paver; the mixture is paved and rolled based on the paver; completed After the rolling operation, seams and health treatment are done. It solves the technical problem that in the prior art, the construction details of the pavement layer are poorly handled, which leads to the damage of the pavement structure after long-term use and load, and then leads to the unevenness of the pavement.

Description

Paving and compaction method for base course and underlayer for road asphalt pavement construction

technical field

The invention relates to the technical field of highway engineering construction, in particular to a method for paving and compacting a base layer and an underlying layer for highway asphalt pavement construction.

Background technique

At present, highway asphalt pavement usually refers to a pavement paved by heating, pouring or mixing with stone and sand as aggregate, mineral powder as filler, asphalt as cementitious material. The asphalt pavement structure usually includes a surface layer, a base layer, and a subbase layer. The base layer is set under the surface layer and plays a main load-bearing role. The subbase layer is set under the base layer and plays a secondary load-bearing role. The structural layers are all subjected to the vehicle load synchronously with the surface layer.

In the prior art, in order to ensure the stable operation of urban vehicles, it is usually necessary to keep the road surface smooth, and the uneven road surface is very likely to cause bumps in the vehicles, which limits the safe and stable operation of the vehicles. Although the current construction road surface will be flattened during construction, due to poor construction details, after long-term use under the load of vehicles, the road surface structure is prone to damage and subsidence, which will lead to uneven road surface and water accumulation. , thereby seriously affecting the traffic safety of vehicles.

Contents of the invention

For this reason, the present invention provides a method for paving and compacting the base layer and the underlying layer for road asphalt pavement construction, so as to solve the problem of poor handling of the construction details of the pavement layer in the prior art, which leads to the failure of , It is easy to cause damage to the pavement structure, which in turn leads to uneven technical problems on the pavement.

In order to achieve the above object, the present invention provides the following technical solutions:

A base paving and compacting method for highway asphalt pavement construction, comprising the steps of:

Make construction preparations according to the underlying layer site where the base layer is to be paved;

Carry out construction lofting for the underlayment that has been prepared for construction;

According to the layered paving of the base layer and the large-thickness paving of the base layer, the formwork is erected separately;

Prepare the mix, transport the mix and unload it to the paver;

Spread and roll the mixture based on the paver;

After the rolling operation is completed, seams and health treatments are done.

On the basis of above-mentioned technical scheme, the present invention is described further as follows:

As a further solution of the present invention, the construction preparation is done according to the lower bearing layer site to be paved, specifically including:

Before the subbase is paved, remove floating soil, sundries and accumulated water on the surface of the lower bearing layer, sprinkle water on the surface of the lower bearing layer, and repress and level it; , mixed with water-stabilized graded crushed stone mixture for filling treatment;

When corresponding to layered paving and rolling construction of the base, the sub-base shall be supported by channel steel with a height of 18cm and a length of 3m; when corresponding to large-thickness paving and compaction of the base, the sub-base shall be supported by channel steel with a height of 20cm+14cm The processed thickened steel mold is supported, and a cross brace is added every 1.5m to ensure that the support is firm and reliable.

As a further solution of the present invention, the described construction lofting for the lower bearing layer that has been prepared for construction specifically includes:

Use the total station to restore the center line, and stake out every 10m for the straight line segment, stake out every 5m for the curved segment, and release the side piles on both sides of the line segment at the same time;

According to the position of the center line and side piles, the reference steel wire supporting steel rods are stably supported every 10m, and the supporting steel rods are consistent with the pile number of the road center line; at the same time, according to the control elevation on both sides of the subbase, a level is used to control and measure the erection of reference steel wire ropes. The steel wire rope and the cross bar supporting the steel drill are bound firmly with straps, and the two ends of the reference wire rope are tightened with wire tightening pliers. The erection length of each reference wire rope is controlled by 100m to ensure that the sensor receiving tension of the reference wire rope reaches 1000N ;

More specifically, the elevation control expression of the reference wire rope is:

H=H1+L×i+H2+ΔH+D

In the formula, H is the reference steel wire elevation; H1 is the design elevation of the pavement structural layer; L is the distance between the reference steel wire and the design elevation position; i is the cross slope of the road surface; H2 is the reserved working height (generally 10cm); Design thickness difference; D is the reference wire rope diameter (3.5mm).

As a further solution of the present invention, the templates are respectively erected according to the layered paving of the base layer and the large thickness paving of the base layer, specifically including:

The formwork installation process for base layer paving and rolling construction is as follows:

For subbase construction, in order to ensure edge compaction, soil road shoulders are used as side formwork on the side close to the road shoulder, and channel steel is used as formwork at the position of the middle divider, and the formwork formed by channel steel is firmly supported by steel brazing;

For soil road shoulder construction, the formwork is set up on the side close to the roadbed, and the soil is filled and leveled manually with machinery, and compacted with a small vibrating rammer, and the compaction degree is not less than 90%. After the formwork is removed, the edge is sprayed with cement slurry. Openings are provided at the rapid flow tank, and mortar is used to prevent erosion;

The channel steel formwork is installed, and the position formwork of the middle separation zone adopts 18cm high channel steel, each channel steel is 3m in length, and oblique supports are added at both ends and in the middle of the channel steel to form a channel steel formwork and be fixed with fixed steel brazing;

The formwork installation process for large-thickness paving and compaction of the base is as follows:

For subbase construction, the soil road shoulder is used as the side form near the road shoulder, and 34cm high channel steel is used for the middle divider, and the length of each channel steel is 3m to form a channel steel formwork and be fixed with fixed steel brazing;

For soil road shoulder construction, according to the design width of the base layer, the soil shoulders on both sides of the compacted road should be cultivated. After compaction, the height of the road shoulders should be the same as the thickness of the designed base layer. The plastic film is used to isolate the road shoulder and the water-stabilized graded gravel mixture to ensure that the mixture is not polluted, and to overcome the phenomenon that the moisture at the edge of the water-stabilized graded gravel mixture is absorbed by the road shoulder soil and becomes loose.

As a further solution of the present invention, the preparation of the mixture, the transportation of the mixture and discharge to the paver specifically include:

For the mixing of the mixture, the mixing of the mixture adopts a vibrating mixer for centralized mixing. During the mixing production process, the water content is adjusted according to the weather conditions, temperature levels, and the situation reflected by the paving of the front field;

After starting the mixing, take a sample of the mixed material to check whether it meets the mixing ratio. If the deviation exceeds the limit, analyze the cause and adjust it in time; after formal production, regularly check whether the mixing ratio, cement dosage, and water content have changed; The water content at noon is adjusted accordingly according to the temperature change;

For the transportation of the mixture, the mixer is equipped with a hopper with a valve funnel; at the outlet of the mixer, the material is evenly loaded in the shape of "product" in front, back and middle to reduce segregation;

For the unloading of the mixture, ensure that there is still 1/3 of the mixture in the hopper of the paver, and then proceed to the unloading work of the next vehicle, reduce the number of bucket collections, and avoid the paver until all the mixture in the hopper is paved. unloading;

In order to prevent the segregation of the mixture, the carriage is slowly raised when the transport vehicle is unloading, so as to avoid lifting the trough to the top at one time, causing the mixture to roll down into the paver in a large area.

As a further solution of the present invention, the described paving and rolling operation of the mixture based on the paver specifically includes:

Check the flatness of the screed before paving, and sprinkle water on the surface of the underlying layer;

Conventional water-stabilized subbase and base mix are directly paved in three layers with two paver machines, and the paving compaction thickness is 18cm+18cm+18cm;

Two pavers with automatic leveling function are used for the large-thickness water-stabilized mixture. On the basis of a layer of water-stabilized subbase, the base is divided into two layers: the lower base and the lower base, and the lower base and the lower base are paved at the same time Laying and rolling forming at the same time, the compacted thickness is 34cm+20cm;

The distance between the front and back of the two paver machines is not more than 10m, and the middle screed is overlapped by 30-50cm.

The loose paving coefficient is determined and controlled according to the laboratory test. The starting speed of the paver is 1m/min, and the vibration frequency of the paver hammer is 50Hz; the normal speed is 1.5m/min, and the vibration frequency of the paver hammer The pounding frequency is 60Hz; the frequency of the tampers of the two paver machines is consistent, so that the initial compaction degree can reach 80%. After the paver, it is equipped to track and handle the edges on both sides to avoid edge segregation;

Equipped to track and deal with the segregation of coarse and fine aggregates, eradicate local coarse aggregate nests, and fill them up with new mixtures; the paving operation is carried out continuously, and if it is interrupted for more than 2 hours for some reason, a transverse joint shall be supported;

The specific paving operation method is as follows:

(1) When the paver starts, the frequency of the tamper is adjusted in direct proportion to the paving speed;

(2) When paving with two machines, the front paver uses the roadside reference wire rope and the guide beam installed in the road to control the elevation. Using reference wire rope and using sliding shoes on the road to control the elevation;

(3) The speed of the paver is controlled to 1.5m/min, and its speed is adapted to the mixing capacity, so as to maintain a constant speed to the greatest extent, and the paving does not stop or stop;

(4) When paving, 2/3 of the screw distributor of the paver is buried in the mixture to reduce segregation;

(5) Tracking and elimination of local segregation phenomena: eradicate local coarse aggregate "nests" and fill them with freshly mixed materials; replace serious parts according to the "principle of square filling";

(6) Manual paving is used for parts that cannot be paved by machinery, and the line-hanging method is used to control the elevation during manual paving;

(7) When paving, track and detect the loose pavement thickness after paving, and take remedial measures immediately if any abnormality occurs.

(8) A rubber baffle is added in front of the paver, and the distance between the bottom of the baffle and the underlying layer is not more than 10cm.

For the mixture rolling operation method is as follows:

(1) After the mixture is paved and formed, it is rolled from low to high within the full width; when rolling, follow the principle of "static pressure first, then vibration, from low to high, low speed and low amplitude, high frequency and low amplitude". The principle of rolling is to press until there are no wheel marks; to ensure that the vibration pressure does not cause waves to move; when rolling, the rollers overlap by 1/2 the wheel width, and the rolling speed is controlled at 1.6km/h for the first to second passes, and controlled at 1.6km/h for each subsequent pass. 2.0km/h; please refer to Table 1-Table 2 for details:

Table 1 Construction scheme of layered paving of the base layer and mechanical combination of rolling and rolling

Table 2 Construction scheme of large-thickness paving and rolling machine combined rolling at the base

(2) The surface layer of the underlying layer is always in a wet state during the rolling process;

(3) It becomes zigzag during longitudinal rolling (minimum staggering 1m), and the joint is staggered into a horizontal 45° ladder shape. After rolling, it is rolled from the middle belt to the outside at 45°;

(4) During the rolling process, the "spring", looseness and peeling phenomenon are eliminated and remedied. The surface after compaction is flat and dense, without wheel marks or bulges, and does not produce "big waves" phenomenon;

(5) For the corners of the slab, use a large roller combined with a small roller to carry out lateral strengthening rolling, and use a higher-power vibrating rammer to compact and compact the positions that cannot be rolled;

(6) When the road roller is temporarily stopped, it is staggered, and the interval is not less than 3m, and it is suspended on the road section that has been rolled;

(7) Quickly detect the degree of compaction after the rolling operation section is completed, and make up the pressure as soon as possible if the compaction is insufficient;

(8) In order to ensure the compactness and strength of the edge, the edge is pressurized at least once compared with the normal section position. Before rolling, grout is artificially sprinkled on the edge of the formwork.

As a further solution of the present invention, after the completion of the rolling operation, seam and health treatment are performed, specifically including:

At the end of the construction, the transverse joints are set at the position of the bridgehead to reduce the transverse working joints;

When the horizontal working joint must be set outside the bridge head, two paver machines will distribute the last truckload of mixed material. When lifting the slab, the paving position of the two paver machines is even. After the rolling is completed, use a 3m ruler to measure the flatness of the joint. Completely remove the parts with unqualified flatness and thickness, so that the transverse working seam is perpendicular to the route direction;

The rolling method at the seam is as follows:

The rolling of the transverse joints is firstly rolled horizontally with a double-drum road roller. When rolling, the road roller is located on the surface of the compacted mixture, and the width extending into the new layer is 15cm. After that, it moves to the newly laid mixture every time 15-20cm, until it is all on the new layer, and then changed to longitudinal rolling; during construction, the parts that cannot be rolled by the bridge head roller are manually compacted with vibrating rammers;

Immediately after the construction is completed, use one cloth and one film geotextile to cover the health. The geotextile is tightly covered. The geotextile is covered according to the direction of the transverse slope and the vertical slope. In order to achieve the effect of health preservation, the geotextile is wrapped with sandbags and pressed, and after the final setting of the cement, it is properly replenished with water. The specific method of replenishment: flow from high to low until the large area is soaked;

After 7 days of health preservation, coring is carried out according to the frequency required by the specification to detect indicators such as integrity, skeleton distribution uniformity, thickness, strength, elevation, cross slope, width, and flatness. Process construction.

A method for paving and compacting the lower layer of road asphalt pavement construction, based on the method for paving and compacting the base layer, continues to perform, and specifically includes the following steps:

Clean up the underlayment site where the lower layer is to be paved, and spread oil for the penetration layer;

Grasp and control the real-time temperature of the paving asphalt mixture at each stage, and transport it to the paver for paving and rolling of the mixture.

As a further solution of the present invention, the construction cleaning is carried out on the under-bearing base of the lower layer to be paved, and the penetration layer oil is sprinkled, which specifically includes:

For the cleaning method of the underlying base:

Before construction, trim the surface of the lower bearing base, remove loose particles, fill the core holes, purge the surface, and strengthen the cleaning of the diseased parts. When there are clay blocks, use a steel brush to clean them;

The method of spreading the penetrating oil:

After the surface is dry, spray the oil for the penetrating layer. The asphalt sprinkler is used for spreading the penetrating layer. The entire width of the pavement is evenly distributed into a thin layer to avoid leaks or strips of sprinklers and accumulation; the penetration oil spreading and crushed stones are constructed simultaneously, and the amount of crushed stones in construction is 12kg/㎡, and the amount of asphalt sprayed is 1.15kg /㎡.

As a further solution of the present invention, the mastering and controlling the real-time temperature of the paving asphalt mixture at each stage, and transporting it to the paver for paving and rolling operations of the mixture, specifically includes:

The wire point control network and the elevation control network have completed the encrypted measurement, and after the construction of the penetration layer is completed, and before the paving construction of the lower layer, the elevation detection record, temperature control and paving preparation procedures are as follows:

(1) Strictly control the heating temperature of asphalt and aggregates and the factory temperature of asphalt mixture;

(2) As the key control of asphalt paving, temperature control is arranged to be inspected and recorded vehicle-by-vehicle and process-by-process in the front and rear fields during construction to form summary data for construction;

(3) The mixing time of each plate is controlled at 60s, and the dry mixing time is 5s; after the specified amount of aggregate and asphalt are sent into the mixing pot, the two materials are fully mixed until all the aggregate particles are completely and evenly covered by the asphalt , the asphalt material is also completely and evenly distributed in the entire mixture, the mixture has no white, no asphalt lumps;

(4) After at least five material trucks with suitable temperature are waiting in front of the paver, start the mixture paving;

The mixture transportation process is as follows:

(1) In order to prevent the asphalt mixture from sticking to the vehicle and facilitate unloading, before loading the asphalt mixture, apply anti-adhesive agent inside the vehicle; check the temperature of each vehicle before leaving the site, after paving and after rolling and record;

(2) In order to reduce the occurrence of segregation, the mixture shall be loaded in the order of "front, back and middle" to avoid one-time loading into a cone;

(3) After the filling is completed, cover the tarpaulin in time to prevent the temperature segregation of the mixture;

(4) When the transport vehicles enter the construction site, the tires are clean and free from pollution; before entering the construction site, wet quilts are laid to prevent pollution;

The paving and shaping operation of the mixture is as follows:

(1) Before paving the underlayer of asphalt, clean the surface pollution and sundries of the sealing layer;

(2) Two sets of VÖGELE 2100 paver are used to pave the asphalt mixture of the surface layer; the two pavers are paved in echelons, with an interval of 10-15m between the front and back, and the overlap of screeds is 10-15cm;

(3) Preheat the ironing plate 1 hour in advance before the construction of the paver, and the temperature shall not be lower than 110°C;

(4) The paver must pave slowly, evenly, continuously and uninterruptedly, and the paving speed should be controlled at 2m/min, so as not to change the speed at will or stop halfway;

(5) The paver adopts an automatic leveling method, and steel wire ropes are used to guide and control the thickness and elevation; control piles are set every 10 meters on both sides of the paver (the ultra-high road section should be properly intensified); during the paving process, steel brazing is used to detect thickness and height The level gauge measures the height and double controls to ensure the thickness of the pavement;

The mixing operation is as follows:

(1) Initial pressure: closely follow the paver, a double steel wheel roller advances with static pressure and weakly vibrates once when retreating, and the rolling speed is 2-2.5km/h;

(2) Re-pressing: following the initial pressure, 3 double-steel rollers with high frequency and low amplitude 3 times, 2 rubber-wheeled rollers followed by double-steel rollers for no less than 3 times, and the rolling speed is 3-4km /h;

(3) Final pressure: closely followed by re-pressure, use a double-drum roller to statically press 1 to 2 times until there is no wheel mark, and the rolling speed is 3-6km/h;

The compaction of asphalt mixture follows the rolling principle of "close follow, less water, slow compaction, high frequency, low amplitude";

As an optional implementation method for the mixture rolling operation process:

(1) Initial pressure: The initial pressure temperature is not less than 140°C during normal construction;

(2) Recompression: The recompression section should avoid overlapping with the unfinished initial pressure section, and keep a distance of about 10m from the initial pressure section;

Before the rubber-tyred road roller enters the paved road for re-pressing, apply a release agent to avoid watering, and the rubber-tyred road roller must try to increase the tire temperature in the first re-pressing stage before entering the next re-pressing stage; the first re-pressing stage The length of the rubber wheel is about 30-50m. During the re-pressing process, if the temperature of the rubber wheel has increased and there is no obvious wheel sticking phenomenon, reduce the number of times of applying the release agent; 1/2 to 1/3 of the double-drum roller overlapping wheel tracks with 20cm to 30cm;

(3) Final pressure: The final pressure is carried out immediately after the re-pressure, and a double-steel wheel vibratory roller is used to statically press the smooth surface to eliminate wheel marks and roll twice; the speed is controlled at 3-6km/h; the final pressure temperature is greater than 90 ℃;

(4) Specific rolling method: rolling from outside to inside, from low to high; the road roller should avoid staying on the already pressed mixture with a temperature higher than 60°C;

(5) Measures to prevent wheel sticking: In order to prevent wheel sticking during the rolling process of the roller, spray mist water on the roller of the steel wheel roller, apply vegetable oil to the rubber wheel roller or refit the automatic smearing device for oiling, and keep the amount of paint to avoid Vegetable oil is spilled on the lower layer of asphalt, affecting the direct bonding effect of each layer, and the anti-sticking wheel measures of the road roller are strictly prohibited from brushing with diesel oil;

(6) Transverse seam treatment:

The horizontal seams are all flat seams, and the horizontal seams between the layers are staggered by at least 3m;

At the end of the construction, the paver slightly lifts the screed 1m from the end and drives away from the site. After the asphalt is rolled and cooled to below 50°C, the flatness is tested with a 6m ruler, and the part with a flatness exceeding 3mm is used The gray line is marked, use a cutting machine to cut the seam along the gray line, and then remove it. Avoid disturbing the inner side layer of the gray line during the removal process; Leave the end of the transverse joint to preheat before paving; the joint rolling is carried out by a road roller, and the horizontal rolling is cut from the formed surface layer to the new paved surface layer, each cut is 5 ~ 10cm, and the transition is gradual until the steel wheel of the road roller rolls Press all into the newly paved section and then roll longitudinally.

The present invention has following beneficial effect:

1. This method can effectively prolong the service life of the pavement structure and ensure the driving safety of vehicles on the basis of improving the construction process and details.

2. The advantages of this method of paving two layers of large-thickness base and sub-base at the same time are as follows:

The construction period is shortened. When constructing in layers, it takes a long time to maintain health after the construction of the lower layer is completed, and it takes at least 7 days to pave the upper layer, which increases the construction period. In addition to saving the 7-day curing period for large-thickness paving, it also saves construction preparation time such as material preparation, formwork support, cleaning, and cement slurry spraying.

Early damage to the base (subbase) layer is avoided. Even after the maintenance period of the lower base is over, the strength of the lower base has not yet been fully formed during the paving process of the upper base. During the construction of the upper base, the rolling of large-tonnage vibratory rollers and engineering transport vehicles can easily cause early damage to the structure of the lower base. As a result, the substructure spalls, microscopic cracks develop, and the strength is not sufficiently formed. The large-thickness paving completely avoids the early damage of the base layer because it is carried out at one time.

Reduces segregation that occurs with conventional paver designs. The large-thickness super paver is specially designed to resist segregation in the horizontal, vertical and height directions, reducing the segregation produced by traditional paver construction.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. The structures and proportions shown in this specification , size, etc., are only used to cooperate with the content disclosed in the manual, so that people familiar with this technology can understand and read. Any modification of structure, change of proportional relationship or adjustment of size will not affect the effect of the present invention. And the goals that can be achieved should still fall within the scope of the technical content disclosed in the present invention.

Fig. 1 is a schematic diagram of the pavement base construction process of the base layer paving and compaction method for highway asphalt pavement construction provided by the embodiment of the present invention.

Fig. 2 is a schematic flow chart of the pavement subsurface layer construction process of the subsurface layer paving and compaction method used for road asphalt pavement construction provided by the embodiment of the present invention.

Fig. 3 is a schematic diagram of the rolling state of the mixture in the method of paving and compacting the base layer and the underlying layer for highway asphalt pavement construction provided by the embodiment of the present invention.

Detailed ways

The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for convenience of description, and are not used to limit the scope of implementation of the present invention. The change or adjustment of the relationship shall also be regarded as the applicable scope of the present invention without substantive change in the technical content.

As shown in Figures 1 to 3, the embodiment of the present invention provides a method for paving and compacting the base layer and the underlying layer for highway asphalt pavement construction, which is used to effectively extend the pavement structure on the basis of improving the construction process and details The service life of the vehicle ensures the driving safety of the vehicle. Wherein, the embodiment of the present invention provides a kind of base layer paving compaction method that is used for highway asphalt pavement construction, specifically comprises the following steps:

S1: Make construction preparations according to the underlying layer site where the base layer is to be paved;

Specifically: before laying the subbase, remove floating soil, sundries, and accumulated water on the surface of the lower bearing layer, sprinkle water on the surface of the lower bearing layer, and carry out repressing and leveling; for the looseness and spring phenomenon of the corresponding road bed of the lower bearing layer, through Excavate and dry, and mix with water-stabilized graded crushed stone mixture for filling treatment.

When corresponding to layered paving and rolling construction of the base, the sub-base shall be supported by channel steel with a height of 18cm and a length of 3m; when corresponding to large-thickness paving and compaction of the base, the sub-base shall be supported by channel steel with a height of 20cm+14cm The processed thickened steel mold is supported, and a cross brace is added every 1.5m to ensure that the support is firm and reliable.

S2: Carry out construction lofting for the underlayment that has been prepared for construction;

Specifically: use the total station to restore the center line, and stake out every 10m for the straight line segment, stake out every 5m for the curved segment, and release the side piles on both sides of the line segment at the same time.

According to the position of the center line and side piles, the reference steel wire supporting steel rods are stably supported every 10m, and the supporting steel rods are consistent with the pile number of the road center line; at the same time, according to the control elevation on both sides of the subbase, a level is used to control and measure the erection of reference steel wire ropes. The steel wire rope and the cross bar supporting the steel drill are bound firmly with straps, and the two ends of the reference wire rope are tightened with wire tightening pliers. The erection length of each reference wire rope is controlled by 100m to ensure that the sensor receiving tension of the reference wire rope reaches 1000N .

More specifically, the elevation control expression of the reference wire rope is:

H=H1+L×i+H2+ΔH+D

In the formula, H is the reference steel wire elevation; H1 is the design elevation of the pavement structural layer; L is the distance between the reference steel wire and the design elevation position; i is the cross slope of the road surface; H2 is the reserved working height (generally 10cm); Design thickness difference; D is the reference wire rope diameter (3.5mm).

S3: According to the layered paving of the base layer and the paving of the base layer with a large thickness, formwork is erected respectively;

Specifically: the formwork installation during layered paving and rolling construction of the base layer is as follows:

For subbase construction, in order to ensure edge compaction, soil road shoulders are used as side formwork on the side close to the road shoulder, and channel steel is used as formwork at the position of the middle divider, and the formwork formed by channel steel is firmly supported by steel brazing;

For soil road shoulder construction, the formwork is set up on the side close to the roadbed, and the soil is filled and leveled manually with machinery, and compacted with a small vibrating rammer, and the compaction degree is not less than 90%. After the formwork is removed, the edge is sprayed with cement slurry. Openings are provided at the rapid flow tank, and mortar is used to prevent erosion;

The channel steel formwork is installed, and the position formwork of the middle separation zone adopts 18cm high channel steel, each channel steel is 3m in length, and oblique supports are added at both ends and in the middle of the channel steel to form a channel steel formwork and be fixed with fixed steel brazing;

The formwork installation for large-thickness paving and compaction of the base is as follows:

For subbase construction, the soil road shoulder is used as the side form near the road shoulder, and 34cm high channel steel is used for the middle divider, and the length of each channel steel is 3m to form a channel steel formwork and be fixed with fixed steel brazing;

For soil road shoulder construction, according to the design width of the base layer, the soil shoulders on both sides of the compacted road should be cultivated. After compaction, the height of the road shoulders should be the same as the thickness of the designed base layer. The plastic film is used to isolate the road shoulder and the water-stabilized graded gravel mixture to ensure that the mixture is not polluted, and to overcome the phenomenon that the moisture at the edge of the water-stabilized graded gravel mixture is absorbed by the road shoulder soil and becomes loose.

S4: Prepare the mixture, transport the mixture and unload it to the paver;

Specifically: for the mixing of the mixture, the mixture is mixed with a vibrating mixer for centralized mixing. During the mixing production process, the water content is adjusted according to the weather conditions, temperature levels, and the situation reflected by the paving of the front field.

After starting the mixing, take a sample of the mixed material to check whether it meets the mixing ratio. If the deviation exceeds the limit, analyze the cause and adjust it in time; after formal production, regularly check whether the mixing ratio, cement dosage, and water content have changed; The water content at noon is adjusted accordingly according to the temperature change.

For the transportation of the mixture, the mixer is equipped with a hopper with a valve funnel; at the outlet of the mixer, the material is evenly loaded in the shape of "product" in front, back and middle to reduce segregation.

For the unloading of the mixture, ensure that there is still 1/3 of the mixture in the hopper of the paver, and then proceed to the unloading work of the next vehicle, reduce the number of bucket collections, and avoid the paver until all the mixture in the hopper is paved. Carry out unloading.

In order to prevent the segregation of the mixture, the carriage is slowly raised when the transport vehicle is unloading, so as to avoid lifting the trough to the top at one time, causing the mixture to roll down into the paver in a large area.

S5: Spreading and rolling the mixture based on the paver;

Specifically: check the flatness of the screed before paving, and sprinkle water on the surface of the underlying layer.

Conventional water-stabilized subbase and base mix are directly paved in three layers with two ABG8820 paver, and the paving compaction thickness is 18cm+18cm+18cm.

The large-thickness water-stabilized mixture adopts two pavers with automatic leveling function. On the basis of a water-stabilized subbase, the base is divided into two layers: the lower base and the lower base. The lower base and the lower base are paved at the same time Paving and rolling forming at the same time, the compaction thickness is 34cm+20cm, and the base cement stabilized gravel mix is used for construction, which reduces the joint bonding surface, improves the overall stability of the base, saves time for curing, and improves construction efficiency to a certain extent. The distance between the front and back of the two paver machines is not more than 10m, and the middle screed is overlapped by 30-50cm.

The loose paving coefficient is determined and controlled according to the laboratory test. The starting speed of the paver is 1m/min, and the vibration frequency of the paver hammer is 50Hz; the normal speed is 1.5m/min, and the vibration frequency of the paver hammer The tamping frequency is 60Hz; the frequency of the tampers of the two paver machines is kept the same, so that the initial compaction degree reaches 80%. After the paver, it is equipped with tracking to handle the edges on both sides to avoid edge segregation.

Equipped to track and deal with the segregation of coarse and fine aggregates, eradicate local coarse aggregate nests, and fill them up with new mixtures; the paving operation is carried out continuously, and if it is interrupted for more than 2 hours for some reason, a transverse joint will be supported.

Specific paving method:

(1) When the paver starts, the frequency of the tamper is adjusted in direct proportion to the paving speed;

(2) When paving with two machines, the front paver uses the roadside reference wire rope and the guide beam installed in the road to control the elevation. Using reference wire rope and using sliding shoes on the road to control the elevation;

(3) The speed of the paver is controlled to 1.5m/min, and its speed is adapted to the mixing capacity, so as to maintain a constant speed to the greatest extent, and the paving does not stop or stop;

(4) When paving, 2/3 of the screw distributor of the paver is buried in the mixture to reduce segregation;

(5) Tracking and elimination of local segregation phenomena: eradicate local coarse aggregate "nests" and fill them with freshly mixed materials; replace serious parts according to the "principle of square filling";

(6) Manual paving is used for parts that cannot be paved by machinery, and the line-hanging method is used to control the elevation during manual paving;

(7) When paving, track and detect the loose pavement thickness after paving, and take remedial measures immediately if any abnormality occurs.

(8) A rubber baffle is added in front of the paver, and the distance between the bottom of the baffle and the underlying layer is not more than 10cm.

For the rolling method of the mixture:

(1) After the mixture is paved and formed, it is rolled from low to high within the full width; when rolling, follow the principle of "static pressure first, then vibration, from low to high, low speed and low amplitude, high frequency and low amplitude". The principle of rolling is to press until there are no wheel marks; to ensure that the vibration pressure does not cause waves to move; when rolling, the rollers overlap by 1/2 the wheel width, and the rolling speed is controlled at 1.6km/h for the first to second passes, and controlled at 1.6km/h for each subsequent pass. 2.0km/h; please refer to Table 1-Table 2 for details:

Table 1 Construction scheme of layered paving of the base layer and mechanical combination of rolling and rolling

Table 2 Construction scheme of large-thickness paving and rolling machine combined rolling at the base

(2) The surface layer of the underlying layer is always in a wet state during the rolling process;

(3) Please refer to Figure 3. When rolling longitudinally, it becomes zigzag (minimum staggered by 1m), and the joint is staggered into a horizontal 45° ladder shape. After rolling, it is rolled from the middle zone to the outside at 45°;

(4) During the rolling process, the "spring", looseness and peeling phenomenon are eliminated and remedied. The surface after compaction is flat and dense, without wheel marks or bulges, and does not produce "big waves" phenomenon;

(5) For the corners of the slab, use a large roller combined with a small roller to carry out lateral strengthening rolling, and use a higher-power vibrating rammer to compact and compact the positions that cannot be rolled;

(6) When the road roller is temporarily stopped, it is staggered, and the interval is not less than 3m, and it is suspended on the road section that has been rolled;

(7) Quickly detect the degree of compaction after the rolling operation section is completed, and make up the pressure as soon as possible if the compaction is insufficient;

(8) In order to ensure the compactness and strength of the edge, the edge is pressurized at least once compared with the normal section position. Before rolling, grout is artificially sprinkled on the edge of the formwork.

S6: After the rolling operation is completed, seams and health treatments are done;

The specifics are: after the construction is completed, the transverse joints will be set at the position of the bridgehead to reduce the transverse working joints.

When it is necessary to set a transverse working joint outside the bridge head, two paver machines distribute the last truckload of mixed material, and the paving position of the two paver machines is even when lifting the slab, and after the rolling is completed, use a 3m ruler to measure the flatness of the joint , Completely remove the parts with unqualified flatness and thickness, so that the horizontal working seam is perpendicular to the route direction.

Rolling method at the seam:

The rolling of the transverse joints is firstly rolled horizontally with a double-drum road roller. When rolling, the road roller is located on the surface of the compacted mixture, and the width extending into the new layer is 15cm. After that, it moves to the newly laid mixture every time 15-20cm, until it is all on the new pavement, then change to longitudinal rolling; during construction, the parts that cannot be rolled by the bridge head roller are manually compacted with vibrating rammers.

Immediately after the construction is completed, use one cloth and one film geotextile to cover the health. The geotextile is tightly covered. The geotextile is covered according to the direction of the transverse slope and the vertical slope. In order to achieve the effect of health preservation, the geotextile is wrapped with sandbags, and after the final setting of the cement, it is properly replenished with water; the specific method of replenishment: flow from a high place to a low place until a large area is soaked.

After 7 days of health preservation, coring is carried out according to the frequency required by the specification to detect indicators such as integrity, skeleton distribution uniformity, thickness, strength, elevation, cross slope, width, and flatness. Process construction.

Embodiments of the present invention also provide a method for paving and compacting the lower layer of road asphalt pavement construction, specifically comprising the following steps:

S1: Clean up the underlayment site where the lower layer is to be paved, and spread oil for the penetration layer;

Specifically: for the cleaning method of the underlying base:

Before construction, trim the surface of the lower bearing base, remove loose particles, fill the core holes, purge the surface, and strengthen the cleaning of the diseased parts. When there are clay blocks, use a steel brush to clean them;

The method of spreading the penetrating oil:

After the surface is dry, spray the oil for the penetrating layer. The asphalt sprinkler is used for spreading the penetrating layer. The entire width of the pavement is evenly distributed into a thin layer to avoid leaks or strips of sprinklers and accumulation; the penetration oil spreading and crushed stones are constructed simultaneously, and the amount of crushed stones in construction is 12kg/㎡, and the amount of asphalt sprayed is 1.15kg /㎡.

S2: Grasp and control the real-time temperature of the paving asphalt mixture at each stage, and transport it to the paver for paving and rolling of the mixture;

Specifically: the wire point control network and the elevation control network have completed the encrypted measurement, and after the construction of the penetration layer is completed, and before the paving construction of the lower layer, the elevation detection record, temperature control and paving preparation procedures are as follows:

(1) Strictly control the heating temperature of asphalt and aggregates and the factory temperature of asphalt mixture;

(2) As the key control of asphalt paving, temperature control is arranged to be inspected and recorded vehicle-by-vehicle and process-by-process in the front and rear fields during construction to form summary data for construction;

(3) The mixing time of each plate is controlled at 60s, and the dry mixing time is 5s; after the specified amount of aggregate and asphalt are sent into the mixing pot, the two materials are fully mixed until all the aggregate particles are completely and evenly covered by the asphalt , the asphalt material is also completely and evenly distributed in the entire mixture, the mixture has no white, no asphalt lumps;

(4) After at least five material trucks with suitable temperature are waiting in front of the paver, start the mixture paving.

The mixture transportation process is as follows:

(1) In order to prevent the asphalt mixture from sticking to the vehicle and facilitate unloading, before loading the asphalt mixture, apply anti-adhesive agent inside the vehicle; check the temperature of each vehicle before leaving the site, after paving and after rolling and record;

(2) In order to reduce the occurrence of segregation, the mixture shall be loaded in the order of "front, back and middle" to avoid one-time loading into a cone;

(3) After the filling is completed, cover the tarpaulin in time to prevent the temperature segregation of the mixture;

(4) When the transport vehicles enter the construction site, the tires are clean and free of pollution; before entering the construction site, wet quilts are laid to prevent pollution.

The paving and shaping operation of the mixture is as follows:

(1) Before paving the underlayer of asphalt, clean the surface pollution and sundries of the sealing layer;

(2) Two sets of VÖGELE 2100 paver are used to pave the asphalt mixture of the surface layer; the two pavers are paved in echelons, with an interval of 10-15m between the front and back, and the overlap of screeds is 10-15cm;

(3) Preheat the ironing plate 1 hour in advance before the construction of the paver, and the temperature shall not be lower than 110°C;

(4) The paver must pave slowly, evenly, continuously and uninterruptedly, and the paving speed should be controlled at 2m/min, so as not to change the speed at will or stop halfway;

(5) The paver adopts an automatic leveling method, and steel wire ropes are used to guide and control the thickness and elevation; control piles are set every 10 meters on both sides of the paver (the ultra-high road section should be properly intensified); during the paving process, steel brazing is used to detect thickness and height The level gauge measures the height and double controls to ensure the thickness of the pavement.

Mixture rolling operations are as follows:

(1) Initial pressure: closely follow the paver, a double steel wheel roller advances with static pressure and weakly vibrates once when retreating, and the rolling speed is 2-2.5km/h;

(2) Re-pressing: following the initial pressure, 3 double-steel rollers with high frequency and low amplitude 3 times, 2 rubber-wheeled rollers followed by double-steel rollers for no less than 3 times, and the rolling speed is 3-4km /h;

(3) Final pressure: followed by re-pressure, use a double-drum roller to statically press 1-2 times until there is no wheel mark, and the rolling speed is 3-6km/h.

The compaction of asphalt mixture follows the rolling principle of "close follow, less water, slow compaction, high frequency, low amplitude";

As an optional implementation method for the mixture rolling operation process:

(1) Initial pressure: The initial pressure temperature is not less than 140°C during normal construction;

(2) Recompression: The recompression section should avoid overlapping with the unfinished initial pressure section, and keep a distance of about 10m from the initial pressure section;

Before the rubber-tyred road roller enters the paved road for re-pressing, apply a release agent to avoid watering, and the rubber-tyred road roller must try to increase the tire temperature in the first re-pressing stage before entering the next re-pressing stage; the first re-pressing stage The length of the rubber wheel is about 30-50m. During the re-pressing process, if the temperature of the rubber wheel has increased and there is no obvious wheel sticking phenomenon, reduce the number of times of applying the release agent; 1/2 to 1/3 of the double-drum roller overlapping wheel tracks with 20cm to 30cm;

(3) Final pressure: The final pressure is carried out immediately after the re-pressure, and a double-steel wheel vibratory roller is used to statically press the smooth surface to eliminate wheel marks and roll twice; the speed is controlled at 3-6km/h; the final pressure temperature is greater than 90 ℃.

(4) Specific rolling method: rolling from outside to inside, from low to high; the road roller should avoid staying on the already pressed mixture with a temperature higher than 60°C;

(5) Measures to prevent wheel sticking

In order to prevent wheel sticking during the rolling process of the roller, spray mist water on the roller of the steel wheel roller, and apply vegetable oil on the rubber wheel roller or modify the automatic application device to apply oil. To achieve the direct bonding effect of each layer, the anti-sticking wheel measures of the road roller are strictly prohibited from brushing with diesel oil.

(6) Horizontal seam treatment

The horizontal seams are all flat seams, and the horizontal seams between the layers are staggered by at least 3m;

At the end of the construction, the paver slightly lifts the screed 1m from the end and drives away from the site. After the asphalt is rolled and cooled to below 50°C, the flatness is tested with a 6m ruler, and the part with a flatness exceeding 3mm is used The gray line is marked, use a cutting machine to cut the seam along the gray line, and then remove it. Avoid disturbing the inner side layer of the gray line during the removal process; Leave the end of the transverse joint to preheat before paving; the joint rolling is carried out by a road roller, and the horizontal rolling is cut from the formed surface layer to the new paved surface layer, each cut is 5 ~ 10cm, and the transition is gradual until the steel wheel of the road roller rolls Press all into the newly paved section and then roll longitudinally.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (10)

1. A base paving and compacting method for highway asphalt pavement construction, is characterized in that, comprises the steps: Make construction preparations according to the underlying layer site where the base layer is to be paved; Carry out construction lofting for the underlayment that has been prepared for construction; According to the layered paving of the base layer and the large-thickness paving of the base layer, the formwork is erected separately; Prepare the mix, transport the mix and unload it to the paver; Spread and roll the mixture based on the paver; After the rolling operation is completed, seams and health treatments are done. 2. the base layer paving and compacting method for highway asphalt pavement construction according to claim 1, is characterized in that, The construction preparations are made according to the site of the lower bearing layer to be paved, which specifically includes: Before the subbase is paved, remove floating soil, sundries and accumulated water on the surface of the lower bearing layer, sprinkle water on the surface of the lower bearing layer, and repress and level it; , mixed with water-stabilized graded crushed stone mixture for filling treatment; When corresponding to the layered paving and rolling construction of the base, the sub-base shall be supported by a channel steel with a height of 18cm and a length of 3m; when the corresponding base is paved and compacted with a large thickness, the sub-base shall be supported by a channel steel with a height of 20cm+14cm The processed thickened steel mold is supported, and a cross brace is added every 1.5m to ensure that the support is firm and reliable. 3. the base layer paving and compacting method for highway asphalt pavement construction according to claim 2, is characterized in that, The construction lofting of the underlayment for the construction preparation is carried out, which specifically includes: Use the total station to restore the center line, and stake out every 10m for the straight line segment, stake out every 5m for the curved segment, and release the side piles on both sides of the line segment at the same time; According to the position of the center line and side piles, the reference steel wire supporting steel rods are stably supported every 10m, and the supporting steel rods are consistent with the pile number of the road center line; at the same time, according to the control elevation on both sides of the subbase, a level is used to control and measure the erection of reference steel wire ropes. The steel wire rope and the cross bar supporting the steel drill are bound firmly with straps, and the two ends of the reference wire rope are tightened with wire tightening pliers. The erection length of each reference wire rope is controlled by 100m to ensure that the sensor receiving tension of the reference wire rope reaches 1000N ; More specifically, the elevation control expression of the reference wire rope is: H=H1+L×i+H2+ΔH+D In the formula, H is the reference steel wire elevation; H1 is the design elevation of the pavement structural layer; L is the distance between the reference steel wire and the design elevation position; i is the cross slope of the road surface; H2 is the reserved working height (generally 10cm); Design thickness difference; D is the reference wire rope diameter (3.5mm). 4. the base layer paving and compacting method for highway asphalt pavement construction according to claim 3, is characterized in that, According to the layered paving of the base layer and the large thickness paving of the base layer, the templates are respectively erected, which specifically includes: The formwork installation process for base layer paving and rolling construction is as follows: For subbase construction, in order to ensure edge compaction, soil road shoulders are used as side formwork on the side close to the road shoulder, and channel steel is used as formwork at the position of the middle divider, and the formwork formed by channel steel is firmly supported by steel brazing; For soil road shoulder construction, the formwork is set up on the side close to the roadbed, and the soil is filled and leveled manually and mechanically, and compacted with a small vibrating rammer, and the compaction degree is not less than 90%. After the formwork is removed, the edge is sprayed with cement slurry. Openings are provided at the rapid flow tank, and mortar is used to prevent erosion; The channel steel formwork is installed, and the position formwork of the middle separation zone adopts 18cm high channel steel, each channel steel is 3m in length, and oblique supports are added at both ends and in the middle of the channel steel to form a channel steel formwork and be fixed with fixed steel brazing; The formwork installation process for large-thickness paving and compaction of the base is as follows: For subbase construction, the soil road shoulder is used as the side form near the road shoulder, and 34cm high channel steel is used for the middle divider, and the length of each channel steel is 3m to form a channel steel formwork and be fixed with fixed steel brazing; For soil road shoulder construction, according to the design width of the base layer, the soil shoulders on both sides of the compacted road should be cultivated. After compaction, the height of the road shoulders should be the same as the thickness of the designed base layer. The plastic film is used to isolate the road shoulder and the water-stabilized graded gravel mixture to ensure that the mixture is not polluted, and to overcome the phenomenon that the moisture at the edge of the water-stabilized graded gravel mixture is absorbed by the road shoulder soil and becomes loose. 5. the base paving and compacting method for highway asphalt pavement construction according to claim 4, is characterized in that, The preparation of the mixture, transportation of the mixture and discharge to the paver specifically include: For the mixing of the mixture, the mixing of the mixture adopts a vibrating mixer for centralized mixing. During the mixing production process, the water content is adjusted according to the weather conditions, temperature levels, and the situation reflected by the paving of the front field; After starting the mixing, take a sample of the mixed material to check whether it meets the mixing ratio. If the deviation exceeds the limit, analyze the cause and adjust it in time; after formal production, regularly check whether the mixing ratio, cement dosage, and water content have changed; The water content at noon is adjusted accordingly according to the temperature change; For the transportation of the mixture, the mixer is equipped with a hopper with a valve funnel; at the outlet of the mixer, the material is evenly loaded in the shape of "product" in front, back and middle to reduce segregation; For the unloading of the mixture, ensure that there is still 1/3 of the mixture in the hopper of the paver, and then proceed to the unloading work of the next vehicle, reduce the number of bucket collections, and avoid the paver until all the mixture in the hopper is paved. unloading; In order to prevent the segregation of the mixture, the carriage is slowly raised when the transport vehicle is unloading, so as to avoid lifting the trough to the top at one time, causing the mixture to roll down into the paver in a large area. 6. the base layer paving and compacting method for highway asphalt pavement construction according to claim 5, is characterized in that, The said paving and rolling operation of the mixture based on the paver specifically includes: Check the flatness of the screed before paving, and sprinkle water on the surface of the underlying layer; Conventional water-stabilized subbase and base mix are directly paved in three layers with two paver machines, and the paving compaction thickness is 18cm+18cm+18cm; Two pavers with automatic leveling function are used for the large-thickness water-stabilized mixture. On the basis of a layer of water-stabilized subbase, the base is divided into two layers: the lower base and the lower base, and the lower base and the lower base are paved at the same time Laying and rolling forming at the same time, the compacted thickness is 34cm+20cm; The distance between the front and back of the two paver machines is not greater than 10m, and the middle screed is overlapped by 30-50cm; The loose paving coefficient is determined and controlled according to the laboratory test. The starting speed of the paver is 1m/min, and the vibration frequency of the paver hammer is 50Hz; the normal speed is 1.5m/min, and the vibration frequency of the paver hammer The pounding frequency is 60Hz; the frequency of the tampers of the two paver machines is consistent, so that the initial compaction degree can reach 80%. After the paver, it is equipped to track and handle the edges on both sides to avoid edge segregation; Equipped to track and deal with the segregation of coarse and fine aggregates, eradicate local coarse aggregate nests, and fill them up with new mixtures; the paving operation is carried out continuously, and if it is interrupted for more than 2 hours for some reason, a transverse joint shall be supported; The specific paving operation method is as follows: (1) When the paver starts, the frequency of the tamper is adjusted in direct proportion to the paving speed; (2) When paving with two machines, the front paver uses the roadside reference wire rope and the guide beam installed in the road to control the elevation. Using reference wire rope and using sliding shoes on the road to control the elevation; (3) The speed of the paver is controlled to 1.5m/min, and its speed is adapted to the mixing capacity, so as to maintain a constant speed to the greatest extent, and the paving does not stop or stop; (4) When paving, 2/3 of the screw distributor of the paver is buried in the mixture to reduce segregation; (5) Tracking and elimination of local segregation phenomena: eradicate local coarse aggregate "nests" and fill them with freshly mixed materials; replace serious parts according to the "principle of square filling"; (6) Manual paving is used for parts that cannot be paved by machinery, and the line-hanging method is used to control the elevation during manual paving; (7) When paving, track and detect the loose paving thickness after paving, and take remedial measures immediately if any abnormality occurs; (8) A rubber baffle is added in front of the paver, and the distance between the bottom of the baffle and the lower bearing layer is not more than 10cm; For the mixture rolling operation method is as follows: (1) After the mixture is paved and formed, it is rolled from low to high within the full width; when rolling, follow the principle of "static pressure first, then vibration, from low to high, low speed and low amplitude, high frequency and low amplitude". The principle of rolling is to press until there are no wheel marks; to ensure that the vibration pressure does not cause waves to move; when rolling, the rollers overlap by 1/2 the wheel width, and the rolling speed is controlled at 1.6km/h for the first to second passes, and controlled at 1.6km/h for each subsequent pass. 2.0km/h; please refer to Table 1-Table 2 for details: Table 1 Construction scheme of layered paving of the base layer and mechanical combination of rolling and rolling Table 2 Construction scheme of large-thickness paving and rolling machine combined rolling at the base (2) The surface layer of the underlying layer is always in a wet state during the rolling process; (3) It becomes zigzag during longitudinal rolling (minimum staggering 1m), and the joint is staggered into a horizontal 45° ladder shape. After rolling, it is rolled from the middle belt to the outside at 45°; (4) During the rolling process, the "spring", looseness and peeling phenomenon are eliminated and remedied. The surface after compaction is flat and dense, without wheel marks or bulges, and does not produce "big waves" phenomenon; (5) For the corners of the slab, use a large roller combined with a small roller to carry out lateral strengthening rolling, and use a higher-power vibrating rammer to compact and compact the positions that cannot be rolled; (6) When the road roller is temporarily stopped, it is staggered, and the interval is not less than 3m, and it is suspended on the road section that has been rolled; (7) Quickly detect the degree of compaction after the rolling operation section is completed, and make up the pressure as soon as possible if the compaction is insufficient; (8) In order to ensure the compactness and strength of the edge, the edge is pressurized at least once compared with the normal section position. Before rolling, grout is artificially sprinkled on the edge of the formwork. 7. the base layer paving and compacting method for highway asphalt pavement construction according to claim 6, is characterized in that, After the completion of the rolling operation, seams and health care are done, which specifically include: At the end of the construction, the transverse joints are set at the position of the bridgehead to reduce the transverse working joints; When the horizontal working joint must be set outside the bridge head, two paver machines will distribute the last truckload of mixed material. When lifting the slab, the paving position of the two paver machines is even. After the rolling is completed, use a 3m ruler to measure the flatness of the joint. Completely remove the parts with unqualified flatness and thickness, so that the transverse working seam is perpendicular to the route direction; The rolling method at the seam is as follows: The rolling of the transverse joints is firstly rolled horizontally with a double-drum road roller. When rolling, the road roller is located on the surface of the compacted mixture, and the width extending into the new layer is 15cm. After that, it moves to the newly laid mixture every time 15-20cm, until it is all on the new layer, and then changed to longitudinal rolling; during construction, the parts that cannot be rolled by the bridge head roller are manually compacted with vibrating rammers; Immediately after the construction is completed, use one cloth and one film geotextile to cover the health. The geotextile is tightly covered. The geotextile is covered according to the direction of the transverse slope and the vertical slope. In order to achieve the effect of health preservation, the geotextile is wrapped with sandbags and pressed, and after the final setting of the cement, it is properly replenished with water. The specific method of replenishment: flow from high to low until the large area is soaked; After 7 days of health preservation, coring is carried out according to the frequency required by the specification to detect indicators such as integrity, skeleton distribution uniformity, thickness, strength, elevation, cross slope, width, and flatness. Process construction. 8. A method for paving and compacting the lower layer of road asphalt pavement construction is characterized in that, based on the method for paving and compacting the base layer as claimed in any one of claims 1-7, it continues to perform, specifically comprising the steps of: Clean up the underlayment site where the lower layer is to be paved, and spread oil for the penetration layer; Grasp and control the real-time temperature of the paving asphalt mixture at each stage, and transport it to the paver for paving and rolling of the mixture. 9. the lower layer paving and compacting method for highway asphalt pavement construction according to claim 8, is characterized in that, The construction cleaning of the sub-base base site of the lower layer to be paved, and the spraying of the permeable oil, specifically include: For the cleaning method of the underlying base: Before construction, trim the surface of the lower bearing base, remove loose particles, fill the core holes, purge the surface, and strengthen the cleaning of the diseased parts. When there are clay blocks, use a steel brush to clean them; The method of spreading the penetrating oil: After the surface is dry, spray the oil for the penetrating layer. The asphalt sprinkler is used for spreading the penetrating layer. The entire width of the pavement is evenly distributed into a thin layer to avoid leaks or strips of sprinklers and accumulation; the penetration oil spreading and crushed stones are constructed simultaneously, and the amount of crushed stones in construction is 12kg/㎡, and the amount of asphalt sprayed is 1.15kg /㎡. 10. the lower layer paving and compacting method for highway asphalt pavement construction according to claim 9, is characterized in that, The mastering and controlling the real-time temperature of the paving asphalt mixture at each stage, and transporting it to the paver for paving and rolling of the mixture, specifically includes: The wire point control network and the elevation control network have completed the encrypted measurement, and after the construction of the penetration layer is completed, and before the paving construction of the lower layer, the elevation detection record, temperature control and paving preparation procedures are as follows: (1) Strictly control the heating temperature of asphalt and aggregates and the factory temperature of asphalt mixture; (2) As the key control of asphalt paving, temperature control is arranged to be inspected and recorded vehicle-by-vehicle and process-by-process in the front and rear fields during construction to form summary data for construction; (3) The mixing time of each plate is controlled at 60s, and the dry mixing time is 5s; after the specified amount of aggregate and asphalt are sent into the mixing pot, the two materials are fully mixed until all the aggregate particles are completely and evenly covered by the asphalt , the asphalt material is also completely and evenly distributed in the entire mixture, the mixture has no white, no asphalt lumps; (4) After at least five material trucks with suitable temperature are waiting in front of the paver, start the mixture paving; The mixture transportation process is as follows: (1) In order to prevent the asphalt mixture from sticking to the vehicle and facilitate unloading, before loading the asphalt mixture, apply anti-adhesive agent inside the vehicle; check the temperature of each vehicle before leaving the site, after paving and after rolling and record; (2) In order to reduce the occurrence of segregation, the mixture shall be loaded in the order of "front, back and middle" to avoid one-time loading into a cone; (3) After the filling is completed, cover the tarpaulin in time to prevent the temperature segregation of the mixture; (4) When the transport vehicles enter the construction site, the tires are clean and free from pollution; before entering the construction site, wet quilts are laid to prevent pollution; The paving and shaping operation of the mixture is as follows: (1) Before paving the underlayer of asphalt, clean the surface pollution and sundries of the sealing layer; (2) Two sets of VÖGELE 2100 paver are used to pave the asphalt mixture of the surface layer; the two pavers are paved in echelons, with an interval of 10-15m between the front and back, and the overlap of screeds is 10-15cm; (3) Preheat the ironing plate 1 hour in advance before the construction of the paver, and the temperature shall not be lower than 110°C; (4) The paver must pave slowly, evenly, continuously and uninterruptedly, and the paving speed should be controlled at 2m/min, so as not to change the speed at will or stop halfway; (5) The paver adopts an automatic leveling method, and steel wire ropes are used to guide and control the thickness and elevation; control piles are set every 10 meters on both sides of the paver (the ultra-high road section should be properly intensified); during the paving process, steel brazing is used to detect thickness and height The level gauge measures the height and double controls to ensure the thickness of the pavement; The mixing operation is as follows: (1) Initial pressure: closely follow the paver, a double steel wheel roller advances with static pressure and weakly vibrates once when retreating, and the rolling speed is 2-2.5km/h; (2) Re-pressing: following the initial pressure, 3 double-steel rollers with high frequency and low amplitude 3 times, 2 rubber-wheeled rollers followed by double-steel rollers for no less than 3 times, and the rolling speed is 3-4km /h; (3) Final pressure: closely followed by re-pressure, use a double-drum roller to statically press 1 to 2 times until there is no wheel mark, and the rolling speed is 3-6km/h; The compaction of asphalt mixture follows the rolling principle of "close follow, less water, slow compaction, high frequency, low amplitude"; As an optional implementation method for the mixture rolling operation process: (1) Initial pressure: The initial pressure temperature is not less than 140°C during normal construction; (2) Recompression: The recompression section should avoid overlapping with the unfinished initial pressure section, and keep a distance of about 10m from the initial pressure section; Before the rubber-tyred road roller enters the paved road for re-pressing, apply a release agent to avoid watering, and the rubber-tyred road roller must try to increase the tire temperature in the first re-pressing stage before entering the next re-pressing stage; the first re-pressing stage The length of the rubber wheel is about 30-50m. During the re-pressing process, if the temperature of the rubber wheel has increased and there is no obvious wheel sticking phenomenon, reduce the number of times of applying the release agent; 1/2 to 1/3 of the double-drum roller overlapping wheel tracks with 20cm to 30cm; (3) Final pressure: The final pressure is carried out immediately after the re-pressure, and a double-steel wheel vibratory roller is used to statically press the smooth surface to eliminate wheel marks and roll twice; the speed is controlled at 3-6km/h; the final pressure temperature is greater than 90 ℃; (4) Specific rolling method: rolling from outside to inside, from low to high; the road roller should avoid staying on the already pressed mixture with a temperature higher than 60°C; (5) Measures to prevent wheel sticking: In order to prevent wheel sticking during the rolling process of the roller, spray mist water on the roller of the steel wheel roller, apply vegetable oil to the rubber wheel roller or refit the automatic smearing device for oiling, and keep the amount of paint to avoid Vegetable oil is spilled on the lower layer of asphalt, affecting the direct bonding effect of each layer, and the anti-sticking wheel measures of the road roller are strictly prohibited from brushing with diesel oil; (6) Transverse seam treatment: The horizontal seams are all flat seams, and the horizontal seams between the layers are staggered by at least 3m; At the end of the construction, the paver slightly lifts the screed 1m from the end and drives away from the site. After the asphalt is rolled and cooled to below 50°C, the flatness is tested with a 6m ruler, and the part with a flatness exceeding 3mm is used The gray line is marked, use a cutting machine to cut the seam along the gray line, and then remove it. Avoid disturbing the inner side layer of the gray line during the removal process; Leave the end of the transverse joint to preheat before paving; the joint rolling is carried out by a road roller, and the horizontal rolling is cut from the formed surface layer to the new paved surface layer, each cut is 5 ~ 10cm, and the transition is gradual until the steel wheel of the road roller rolls Press all into the newly paved section and then roll longitudinally.