CN115821677A - Double-layer continuous pavement construction process for pavement regeneration - Google Patents

Abstract

The invention belongs to the technical field of highway maintenance, in particular to a pavement regeneration double-layer continuous paving construction process, which mainly introduces a construction process that a road is 9 m wide and double-layer continuous paving, and comprises the following steps: s1, preparing construction; s2, cold regeneration milling and planing of foamed asphalt; s3, cold regeneration of foamed asphalt and spreading of aggregate; s4, spreading the foamed asphalt cold recycled cement; s5, cold regeneration operation of foamed asphalt; s6, synchronously paving cement, regenerating and milling on the spot; s7, synchronously paving cement cold regeneration spreading stones; s8, synchronously paving cement for cold regeneration and spreading cement; s9, synchronously paving cement cold regeneration operation; s10, synchronously paving cement cold regeneration paving; s11, synchronously paving, cold regenerating and rolling cement; s12, cold regeneration paving of foamed asphalt; s13, cold regeneration and rolling of foamed asphalt; s14, health preserving and traffic opening. According to the invention, double-layer continuous paving construction is adopted, so that the maintenance time of the water stable-cooling regeneration mixture base layer is saved, the construction progress is accelerated, the construction cost is saved, and the method has great significance for protecting water resources and ecological environment.

Description

Double-layer continuous pavement construction process for pavement regeneration

Technical Field

The invention relates to the technical field of highway maintenance, in particular to a pavement regeneration double-layer continuous paving construction process.

Background

The road development of China is generally transited from an early construction stage to a current construction and maintenance stage, 12% of asphalt pavements in each year need to be renovated from the current province, the important task of the circular economy aided carbon reduction action is definitely provided, the in-situ regeneration and utilization of pavement materials are required to be promoted, and the comprehensive utilization demonstration construction of a large amount of solid wastes is accelerated. The recycling rate of the waste asphalt pavement of the trunk line in Jiangsu province, general country and province in 2021 reaches more than 85%. The requirement of the construction of 'waste-free cities' of the state institute is provided, the concept of the development of green low-carbon resources is taken, the waste of resources is avoided, and the utilization rate of the resources is improved.

In recent years, china is actively building a resource-saving and environment-friendly society, in order to implement a road policy of sustainable development, and to maximize limited capital benefits, the sustainable development is an important direction for highway construction and maintenance development in the future. At present, the cold regeneration and reutilization of the base layer and the surface layer draws wide attention and is applied newly, the cold regeneration technology can solve the problems of stacking, abandonment, environmental pollution and the like of waste pavement materials, realizes the regeneration and cyclic utilization of the waste pavement materials, reduces the exploitation of mineral resources such as stones and the like, protects the environment, reduces the road maintenance cost and the environment protection, reduces the road maintenance cost, and meets the development targets of national circular economy, sustainable development, resource saving and environmental friendliness; meets the requirement of 'green traffic' in 'four traffic' proposed by China, and has obvious social and environmental benefits. At present, a plurality of road base layers and surface layers need centralized treatment and maintenance, and at present, because the requirements of partial road grades are not high, the construction period is short, and the tasks are tight, a pavement regeneration double-layer continuous paving construction process needs to be designed to solve the problems.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a pavement regeneration double-layer continuous paving construction process.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a pavement regeneration double-layer continuous paving construction process, which mainly introduces a construction process of a 9-meter wide double-layer continuous paving, and comprises the following steps: s1, preparing construction; s2, cold regeneration and milling of foamed asphalt; s3, cold regeneration of the foamed asphalt and spreading of aggregate; s4, spreading the foamed asphalt cold recycled cement; s5, cold regeneration operation of foamed asphalt; s6, synchronously paving cement, regenerating and milling on the spot; s7, synchronously paving cement cold regeneration spreading stones; s8, synchronously paving cement for cold regeneration and spreading cement; s9, synchronously paving cement cold regeneration operation; s10, synchronously paving cement cold regeneration paving; s11, synchronously paving, cold regeneration and rolling of cement; s12, cold regeneration paving of foamed asphalt; s13, cold regeneration and rolling of foamed asphalt; s14, health preserving and traffic opening.

Preferably, the method comprises the following steps:

s1, construction preparation comprises mechanical preparation and material preparation:

the machine preparation comprises:

a foamed asphalt regeneration unit: 3800CR system (reclaimer, asphalt tanker, waterwheel, etc.); 1 spreading machine; 1 double-steel-wheel road roller (with strong and weak vibration adjustment) and 20t or more full-hydraulic single-steel-wheel road rollers; more than 26t of rubber-tyred road roller 1, 2 watering cars and 6 transport cars.

A cold in-place regenerator 380CR 1; 1 full-hydraulic single steel wheel vibratory roller with the weight of more than 20t and 1 paver; one 30T rubber wheel and 2 watering cars; 1 cement spreader vehicle and 1 stone spreader vehicle.

The material preparation comprises:

according to the design result of the mixing proportion, the required raw materials including foamed asphalt, crushed stone, cement and other materials are prepared, and the other auxiliary materials are determined according to the requirements of on-site observation.

S2, cold regeneration and milling of foamed asphalt:

firstly, milling a half-width surface layer with the length of 400 meters by an asphalt recycling machine, and transporting the surface layer to a specified position by a transport vehicle for stacking;

and milling the asphalt surface layer of the old road of the half-range carriageway outside the working width of the regenerating machine in advance by adopting a 1m milling machine, wherein the milling depth is the same as the regenerating depth, conveying the milled materials to the working surface to be regenerated through a conveying belt, and leveling by utilizing a forklift.

S3, cold regeneration of the foamed asphalt and spreading of aggregate:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The broken stones are uniformly spread on the surface of the old road, the spreading amount of the broken stones is calibrated during construction, the broken stones are accurately spread according to the measurement designed according to the mix proportion, the broken stones are required to be uniformly distributed on the longitudinal section, the cross section can not be completely covered, because the mixture is folded towards the position of an intermediate conveyor belt when a regenerator is used for milling, milling and mixing, and the mixture can be continuously mixed in the folding process;

and after the gravel spreading is finished, correcting the spreading amount of each square gravel on site to determine the final spreading effect and quality.

S4, spreading the foamed asphalt cold recycled cement:

after the gravel is spread, the cement is spread by using a spreading vehicle, the additive is also spread by using the spreading vehicle, and the spreading amount per square meter is calculated according to the use amount according to the design result of the mixing proportion.

The cement spreading amount should be calibrated on site or controlled locally, the cement spreading needs to be distributed uniformly on the longitudinal section, the cross section can not be covered completely, because the mixture is gathered to the position of the middle conveyor belt for mixing when the regenerating machine is used for milling and mixing. Once the cement spread is complete, the other vehicles, except for the reclaimer (including the ancillary equipment), must not enter the construction area on a uniform basis.

S5, cold regeneration operation of foamed asphalt:

and starting construction equipment, and loosening and mixing the pavement according to the set regeneration depth. The regenerated mixture is conveyed to a transport vehicle through a conveying belt of the regenerating machine, and the transport vehicle is conveyed to the foamed asphalt cold-regeneration paving starting point position to wait. The regenerating unit must carry on the regeneration operation at the uniform velocity, continuously, must not change the speed or stop midway at will, the construction speed of regeneration should be 3-6m/min, the additional water consumption and asphalt consumption are determined by the design result of the mix proportion.

S6, synchronously paving cement, regenerating and milling on site:

after the foamed asphalt cold recycling machine regenerates and mixes, the original old road base layer is exposed, then a 1m milling machine is adopted to mill the old road base layer of the half-width roadway outside the working width of the recycling machine in advance, the milling depth is the same as the regeneration depth, the milled material is conveyed to a working surface to be regenerated through a conveying belt, and a forklift is used for leveling.

S7, synchronously paving cement cold regeneration spreading stones:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The aggregate should remain dry with local total amount control. The spreading can be carried out manually when the condition is not satisfied, but the spreading should be carried out by using lime powder on the road surface in advance, the total amount of the spreading is preferably controlled according to the area of 100m < 2 > to 300m < 2 >, and the spreading thickness is uniform.

S8, synchronously paving cement, cold regenerating and spreading cement:

the spreading method can be adopted by a spreading vehicle. The cement spreading amount should be calibrated on site or controlled locally, the cement spreading vehicle is generally 2.5m, the regeneration width is 3.8m, the spreading vehicle needs to convert one time of spreading into the cement dosage with corresponding width, the cement spreading requires uniform distribution on the longitudinal section, the cross section can not be completely covered, because the mixture can be folded towards the position of the middle conveyor belt when the regenerator mills and mixes.

S9, synchronously paving cement cold regeneration operation, comprising the following steps:

(1) Connecting all the required construction machines end to end in sequence at a construction starting point, and connecting corresponding pipelines;

(2) And starting construction equipment, milling and mixing the pavement according to the set regeneration depth. The regenerating unit must carry on the regeneration operation slowly, evenly, continuously, must not change the speed or pause in the middle of the journey arbitrarily, the construction speed of regeneration depends on the type of regenerating machine and regenerated material, preferably 3-6 m/min;

(3) In straight line and flat curve section without superelevation, the regenerator should start along the outside of the road width first, and then construct towards the inside of the road width gradually; setting a super-high flat curve section, wherein the regenerator starts along the inner side of the road width firstly and then gradually constructs towards the outer side of the road width;

(4) The regenerated road surface is marked by talcum powder to be used as a direction guide of the regenerator, so that the regenerator is ensured to move forward along the correct direction. When the downward cutting depth of the regenerating machine needs to be adjusted under special conditions, the downward cutting depth of the regenerating machine needs to be slowly adjusted (the downward cutting depth is adjusted within 3mm at one time), so that the phenomenon of obvious slab staggering is avoided, and the height difference is avoided when a subsequent spreading machine spreads;

(5) A special person should follow the regenerating machine to check the regenerating depth, the cement content and the water content at any time, and the operator of the regenerating machine is matched for adjustment;

(6) 4-5 people are preferably arranged behind the regenerating machine to process sideline segregation and clear impurities in the mixture and excess materials at the initial position of each knife so as to prevent the influence on longitudinal seams, transverse seams, flatness and compactness of the regenerated materials;

(7) In the construction process, when the gradation, the regeneration depth and the water injection amount of the mixture are in any doubt, the construction is stopped, and the construction is continued after the problems are solved.

S10, synchronously paving the cement cold recycling pavement, and specifically comprises the following steps:

(1) During paving construction, attention should be paid to well control of the transverse slope and the thickness;

(2) In the paving process, the amplitude of the screed plate and the vibration frequency of the rammer are reasonably selected. Generally, the cold recycled mix is preferably compacted initially by using a "ram vibration frequency greater than screed amplitude". Gaps at the widened hinged positions of the ironing plates are carefully and tightly adjusted, so that traces are prevented from being left on the surface of the paved road;

(3) The height of the material level sensor is controlled in the spreading process of the spreading machine, so that the spiral feeder in the material storage box is always embedded into the cold recycling mixture to be not less than 3/4 of the height of the cold recycling mixture, and the segregation of the cold recycling mixture in the spreading process is reduced. When the artificial paving or repairing is carried out, a spade buckling process is adopted, and a flat throwing method is not suitable; the cold recycling mixture is paved and leveled at the same time, the hand strength is light and the hand strength is consistent, and the artificial segregation of the cold recycling mixture is avoided;

(4) The ironing plate of the paver must be spliced tightly without gaps, so that pavement is prevented from being pulled out of streaks by the clamped aggregate;

(5) When the paver is installed and operated, a mixture anti-segregation measure such as reducing the height above the ground of a front baffle plate of the distributing device is adopted, a special person is arranged behind the paver to eliminate the segregation phenomenon, the concentrated part of the local coarse aggregate is shoveled, and the new mixture is filled;

(6) Flatness control: after the spreading machine is spread, a quality inspector uses a three-meter ruler to detect the flatness in time, particularly the flatness of the start-stop position of the spreading machine, and places which do not meet the requirement are manually leveled in time;

(7) The longitudinal lap joint is collected by using a manual push rake, so that the road roller is not higher than the ground when rolling.

S11, synchronously paving cement, cold regeneration and rolling: the machine body comprises the following steps:

(1) The compaction construction flow is suggested as follows:

(2) In the rolling process, the surface of the regeneration layer should be kept wet all the time, if the water evaporation is too fast, the water should be sprayed for supplement in time, but the water amount should not be too large.

(3) In order to avoid the situation that the mixture is pushed to generate a hug during rolling, the driving wheel is rolled towards the paver from the outer side to the center during rolling, the driving wheel is rolled from low to high in an ultrahigh section, and the driving wheel is rolled from low to high on a ramp;

(4) In the rolling process, if the phenomena of 'spring', looseness, peeling and the like exist, the mixture is turned over in time and is re-mixed (a proper amount of cement is added) or is treated by other methods, so that the quality requirement is met.

(5) After each section of rolling is finished and the compaction degree is checked to be qualified, the foam asphalt on-site regeneration construction (which must be finished within the initial setting time of cement) is carried out immediately.

S12, cold regeneration and paving of foamed asphalt:

after the in-situ cold recycling of the cement is finished and the compaction degree is detected to be qualified, the foamed asphalt cold recycling paver is in place, the transport vehicle filled with the foamed asphalt mixture is butted with the paver, the paver paves the cement, and a paving coefficient is formulated according to the model of the paver. And the thickness and the flatness of the middle aluminum alloy beam are controlled. The thickness flatness of the regeneration layer is strictly controlled, and the transverse gradient of the road arch is ensured to meet the design requirement.

S13, cold regeneration and rolling of foamed asphalt, which specifically comprises the following steps:

(1) The method comprises the following steps that 1 vibration roller is used for rolling behind each paver, the length of one rolling is about 100m, then 1 single steel wheel roller and 1 rubber wheel roller are used for rolling respectively, the layers are clear, and obvious boundary marks are set;

(2) The rolling must follow the principle of 'first light then heavy, first slow then fast, first static then vibration, first edge then middle, first low then high';

(3) Compacting and planning rolling combination, namely vibrating the front and the back of the double-steel-wheel road roller 1 time under static condition → rolling the front and the back of the vibratory road roller 3 times under large vibration condition → stabilizing the pressure of the rubber wheel 4 times → static pressing the double steel wheels 1 time. And (4) pressing until no wheel mark exists, detecting the compaction degree by using a sand filling method at any time in the rolling process, and repeatedly pressing when the compaction degree is unqualified until the detection reaches the compaction degree requirement. After the detection that the compaction degree meets the requirement, the rolling finishing time of the foamed asphalt should be controlled to be completed before the initial setting time of the base cement.

S14, health preserving and traffic opening:

(1) When the health preserving is carried out under the condition of closed traffic, natural health preserving can be carried out, measures are generally not needed, and vehicles are forbidden to pass in the health preserving period;

(2) When the core drilling machine of a drill bit with the diameter of 150mm is used for the regeneration layer, complete base layer and surface layer core samples can be taken out, and the curing can be finished;

(3) After curing, traffic needs to be opened, and a layer of slow-breaking emulsified asphalt is timely sprayed after compaction, wherein the spraying amount is preferably 0.3kg per square meter to 0.6kg per square meter.

Compared with the prior art, the invention provides a pavement regeneration double-layer continuous paving construction process, which comprises the following steps

Has the advantages that:

1. this road surface regeneration double-deck continuous paving construction technology, through multi-functional short-term test car, short-term test road surface disease, supplementary ground penetrating radar knows the stealthy disease in the road surface structure comprehensively, provides the basis for road surface disease treatment, and then the guarantee eliminates the road surface problem comprehensively.

2. According to the pavement regeneration double-layer continuous paving construction process, the cement in-situ cold regeneration based on synchronous paving is adopted, the novel in-situ cold regenerator adopts an undercut construction method, and the uniformity of a regenerated mixture is well guaranteed. .

3. According to the pavement regeneration double-layer continuous paving construction process, the regenerated mixture is synchronously conveyed to the paver through the conveying belt, and is rolled after being paved by the paver, so that the uniformity and the pavement evenness of the mixture are ensured.

4. According to the pavement regeneration double-layer continuous paving construction process, the vibration-free maintenance-free agent is added through base layer regeneration, the in-situ cold regeneration maintenance time of cement is shortened from 7 days to 2-3 days, the construction period is shortened, the efficiency is improved, and the due strength of the pavement cannot be reduced.

5. According to the pavement regeneration double-layer continuous paving construction process, the base layer and the surface layer are maintained together in a form of synchronously paving the cement in-situ cold regeneration base layer and the foamed asphalt in-situ cold regeneration lower surface layer in a double-layer continuous paving manner, so that the construction period is shortened, the interlayer connection is tight, and the surface layer and the base layer can be taken out together without spreading permeable layer oil when a core sample is extracted.

Drawings

Fig. 1 is a schematic construction process flow diagram of the pavement regeneration double-layer continuous paving construction process provided by the invention.

Fig. 2 is a schematic view of a pavement layered structure of the pavement regeneration double-layer continuous paving construction process provided by the invention.

In the figure: 1. AC-13 (SBS) modified asphalt concrete layer; 2. a foamed asphalt cold regeneration layer; 3. a cement stabilized macadam cold regeneration layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-2, the road surface regeneration double-layer continuous paving construction process comprises the following steps: s1, preparing construction; s2, cold regeneration milling and planing of foamed asphalt; s3, cold regeneration of foamed asphalt and spreading of aggregate; s4, spreading the foamed asphalt cold recycled cement; s5, cold regeneration operation of foamed asphalt; s6, synchronously paving cement, regenerating and milling on the spot; s7, synchronously paving cement cold regeneration spreading stones; s8, synchronously paving cement, cold regeneration and spreading cement; s9, synchronously paving cement cold regeneration operation; s10, synchronously paving cement cold regeneration paving; s11, synchronously paving, cold regenerating and rolling cement; s12, cold regeneration paving of foamed asphalt; s13, cold regeneration and rolling of foamed asphalt; s14, health preserving and traffic opening.

In a specific embodiment, the method specifically comprises the following steps:

s1, construction preparation comprises mechanical preparation and material preparation:

the machine preparation comprises:

a foamed asphalt regeneration unit: 3800CR system (reclaimer, asphalt tanker, waterwheel, etc.); 1 spreading machine; 1 double steel wheel road roller (with strong and weak vibration adjustment), 20t and above full hydraulic single steel wheel road roller; 1 rubber-tyred road roller with the weight of more than 26t, 2 watering trucks and 6 transport trucks;

a cold in-place regenerator 380CR 1; 1 full-hydraulic single steel wheel vibratory roller with the weight of more than 20t and 1 paver; one 30T rubber wheel and 2 watering cars; 1 cement spreader and 1 stone spreader.

The material preparation comprises:

according to the design result of the mixing proportion, the required raw materials including foamed asphalt, macadam, cement and other materials are prepared, and the rest auxiliary materials are determined according to the requirements of site observation.

S2, cold regeneration and milling of foamed asphalt:

firstly, milling a half-width surface layer with the length of 400 meters by an asphalt recycling machine, and transporting the surface layer to a specified position by a transport vehicle for stacking;

and milling the asphalt surface layer of the old road of the half-range carriageway outside the working width of the regenerating machine in advance by adopting a 1m milling machine, wherein the milling depth is the same as the regenerating depth, conveying the milled materials to the working surface to be regenerated through a conveying belt, and leveling by utilizing a forklift.

S3, cold regeneration of foamed asphalt and spreading of aggregate:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The broken stones are uniformly spread on the surface of the old road, the spreading amount of the broken stones is calibrated during construction, the broken stones are accurately spread according to the measurement designed according to the mix proportion, the broken stones are required to be uniformly distributed on the longitudinal section, the cross section can not be completely covered, because the mixture is folded towards the position of an intermediate conveyor belt when a regenerator is used for milling, milling and mixing, and the mixture can be continuously mixed in the folding process;

and after the gravel spreading is finished, correcting the spreading amount of each square gravel on site to determine the final spreading effect and quality.

S4, spreading the foamed asphalt cold recycled cement:

after the gravel is spread, the cement is spread by using a spreading vehicle, the additive is also spread by using the spreading vehicle, and the spreading amount per square meter is calculated according to the use amount according to the design result of the mixing proportion.

The cement spreading amount should be calibrated on site, or controlled locally, and the cement spreading needs to be distributed uniformly on the longitudinal section, and the cross section can not be covered completely, because the mixture will be gathered to the position of the middle conveyor belt and mixed when the regenerating machine mills and mixes. Once the cement spread is complete, other vehicles, except for the reclaimer (including accessories), must not enter the construction area on a uniform basis.

S5, cold regeneration operation of foamed asphalt:

and starting construction equipment, and loosening and mixing the pavement according to the set regeneration depth. The regenerated mixture is conveyed to a transport vehicle through a conveying belt of the regenerating machine, and the transport vehicle is conveyed to the position of the foamed asphalt cold regeneration paving starting point to wait. The regenerating unit must carry on the regeneration operation at the uniform velocity, continuously, must not change the speed or pause in the midway at will, the construction speed of regeneration should be 3-6m/min, plus water consumption and pitch consumption are determined by the design result of the mix proportion.

S6, synchronously paving cement, regenerating and milling on site:

after the foamed asphalt cold recycling machine regenerates and mixes, the original old road base layer is exposed, then a 1m milling machine is adopted to mill the old road base layer of the half-width traffic lane outside the working width of the recycling machine in advance, the milling depth is the same as the recycling depth, milling materials are conveyed to a working surface to be recycled through a conveying belt, and a forklift is used for leveling.

S7, synchronously paving cement cold regeneration spreading stones:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The aggregate should be kept dry with local total amount control. The artificial spreading can be adopted when the condition is not met, but the artificial spreading is to be performed on the road surface in advance by using lime powder, the total amount is preferably controlled according to the area of 100m < 2 > to 300m < 2 >, and the spreading thickness is uniform.

S8, synchronously paving cement, cold regenerating and spreading cement:

the spreading method can be adopted by a spreading vehicle. The cement spreading amount should be calibrated on site or controlled locally, the cement spreading vehicle is generally 2.5m, the regeneration width is 3.8m, the spreading vehicle needs to convert one time of spreading into the cement dosage with corresponding width, the cement spreading requires uniform distribution on the longitudinal section, the cross section can not be completely covered, because the mixture can be folded towards the position of the middle conveyor belt when the regenerator mills and mixes.

S9, synchronous paving of cement cold regeneration operation, which comprises the following steps:

(1) Connecting all the required construction machines end to end in sequence at a construction starting point, and connecting corresponding pipelines;

(2) And starting construction equipment, milling and mixing the pavement according to the set regeneration depth. The regenerating unit must carry on the regeneration operation slowly, evenly, continuously, must not change the speed or pause in the middle of the journey arbitrarily, the construction speed of regeneration depends on the type of regenerating machine and regenerated material, preferably 3-6 m/min;

(3) In straight line and flat curve sections without superelevation, the regenerator starts along the outer side of the road width firstly and then gradually constructs towards the inner side of the road width; setting a super-high flat curve section, wherein the regenerator starts along the inner side of the road width firstly and then gradually constructs towards the outer side of the road width;

(4) The regenerated road surface is marked by talcum powder and used as the direction guide of the regenerator to ensure that the regenerator moves along the right direction. When the cutting depth of the regenerator needs to be adjusted under special conditions, the cutting depth of the regenerator needs to be slowly adjusted (the cutting depth is adjusted within 3mm at one time), so that the phenomenon of obvious slab staggering is avoided, and the height difference of a subsequent paver during paving is avoided;

(5) A special person should follow the regenerating machine to check the regenerating depth, the cement content and the water content at any time, and the operator of the regenerating machine is matched for adjustment;

(6) 4-5 persons are arranged behind the regenerating machine to treat the side line segregation and clean impurities in the mixture and excess materials at the initial position of each tool so as to prevent the longitudinal joint, the transverse joint, the flatness and the compactness of the regenerated material from being influenced;

(7) In the construction process, when the gradation, the regeneration depth and the water injection amount of the mixture are in any doubt, the construction is stopped, and the construction is continued after the problems are solved.

S10, synchronously paving the cement cold recycling pavement, and specifically comprises the following steps:

(1) During paving construction, attention should be paid to well control of the transverse slope and the thickness;

(2) In the paving process, the amplitude of the screed plate and the vibration frequency of the rammer are reasonably selected. Generally, the cold recycled mix is preferably compacted initially by using a "ram vibration frequency greater than screed amplitude". The gap at the widened and hinged part of the ironing plate is carefully adjusted to be tight, so that the trace on the surface of the paved road is prevented;

(3) In the paving process of the paver, the height of the material level sensor must be controlled well, so that the spiral feeder in the material storage box is always embedded into the cold recycled mixture to be not less than 3/4 of the cold recycled mixture, and the segregation of the cold recycled mixture in the paving process is reduced. When the artificial spreading or repairing is carried out, a spade buckling process is adopted, and a flat throwing method is not suitable; the cold recycling mixture is paved while the cold recycling mixture is leveled, the manual force is light and the manual force is important to be consistent, and the artificial segregation of the cold recycling mixture is avoided;

(4) The ironing plate of the paver must be spliced tightly without gaps, so that pavement is prevented from being pulled out of streaks by the clamped aggregate;

(5) When the paver is installed and operated, a mixture anti-segregation measure such as reducing the height above the ground of a front baffle plate of the distributing device is adopted, a special person is arranged behind the paver to eliminate the segregation phenomenon, the concentrated part of the local coarse aggregate is shoveled, and the new mixture is filled;

(6) Flatness control: after the spreading machine is spread, a quality inspector uses a three-meter ruler to detect the flatness in time, particularly the flatness of the start-stop position of the spreading machine, and places which do not meet the requirement are manually leveled in time;

(7) The longitudinal lap joint is collected by using a manual push rake, so that the road roller is not higher than the ground when rolling.

S11, synchronously paving cement, cold regeneration and rolling: the body comprises the following steps:

(1) The compaction construction flow is suggested as follows:

(2) In the rolling process, the surface of the regeneration layer should be kept wet all the time, if the water evaporation is too fast, the water should be sprayed for supplement in time, but the water amount should not be too large;

(3) In order to avoid the situation that the mixture is pushed to generate a hug during rolling, the driving wheel faces the paver to roll from the outer side to the center during rolling, the driving wheel rolls from low to high in an ultrahigh section, and the driving wheel rolls from low to high on a ramp;

(4) In the rolling process, if the phenomena of 'spring', looseness, peeling and the like exist, the roller is turned over in time and is re-stirred (a proper amount of cement is added) or is treated by other methods, so that the roller reaches the quality requirement;

(5) After each section of rolling is finished and the compaction degree is checked to be qualified, the foam asphalt on-site regeneration construction (which must be finished within the initial setting time of cement) is carried out immediately.

S12, cold regeneration and paving of foamed asphalt:

after the in-situ cold recycling rolling of the cement is finished and the compactness is detected to be qualified, the foamed asphalt cold recycling paver is in place, the transport vehicle filled with the foamed asphalt mixture is butted with the paver, paving is carried out by the paver, and a paving coefficient is formulated according to the model of the paver. And the thickness and the flatness of the middle aluminum alloy beam are controlled. The thickness flatness of the regeneration layer is strictly controlled, and the transverse gradient of the road arch is ensured to meet the design requirement.

S13, cold regeneration and rolling of foamed asphalt, which specifically comprises the following steps:

(1) The method comprises the following steps that 1 vibration roller is used for rolling behind each paver, the length of one rolling is about 100m, then 1 single steel wheel roller and 1 rubber wheel roller are used for rolling respectively, the layers are clear, and obvious boundary marks are set;

(2) The rolling must follow the principle of 'light first then heavy, slow first then fast, static first then vibration, edge first then medium, low first then high';

(3) Compacting and planning rolling combination, namely vibrating the front and the back of the double-steel-wheel road roller 1 time under static condition → rolling the front and the back of the vibratory road roller 3 times under large vibration condition → stabilizing the pressure of the rubber wheel 4 times → static pressing the double steel wheels 1 time. And (4) pressing until no wheel mark exists, detecting the compaction degree by using a sand filling method at any time in the rolling process, and repeatedly pressing when the compaction degree is unqualified until the detection reaches the compaction degree requirement. After the detection that the compaction degree meets the requirement, the rolling finishing time of the foamed asphalt should be controlled to be completed before the initial setting time of the base cement.

S14, health preserving and traffic opening:

(1) When the health preserving is carried out under the condition of closed traffic, natural health preserving can be carried out, measures are not generally needed, and vehicles are forbidden to pass during the health preserving period;

(2) When the core drilling machine of a drill bit with the diameter of 150mm is used for the regeneration layer, complete base layer and surface layer core samples can be taken out, and the curing can be finished;

(3) After curing, traffic needs to be opened, and a layer of slow-breaking emulsified asphalt is timely sprayed after compaction, wherein the spraying amount is preferably 0.3kg per square meter to 0.6kg per square meter.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (2)

1. The pavement regeneration double-layer continuous paving construction process is characterized by comprising the following steps: s1, preparing construction; s2, cold regeneration milling and planing of foamed asphalt; s3, cold regeneration of the foamed asphalt and spreading of aggregate; s4, spreading the foamed asphalt cold recycled cement; s5, cold regeneration operation of foamed asphalt; s6, synchronously paving cement, regenerating and milling on the spot; s7, synchronously paving cement cold regeneration spreading stones; s8, synchronously paving cement for cold regeneration and spreading cement; s9, synchronously paving cement cold regeneration operation; s10, synchronously paving cement cold regeneration paving; s11, synchronously paving, cold regenerating and rolling cement; s12, cold regeneration paving of foamed asphalt; s13, cold regeneration and rolling of foamed asphalt; s14, health preserving and traffic opening.

2. The pavement regeneration double-layer continuous paving construction process according to claim 1, which is characterized by comprising the following steps:

s1, construction preparation comprises mechanical preparation and material preparation:

the machine preparation comprises:

a foamed asphalt regeneration unit: 3800CR system (reclaimer, asphalt tanker, waterwheel, etc.); 1 spreading machine; 1 double steel wheel road roller (with strong and weak vibration adjustment), 20t and above full hydraulic single steel wheel road roller; more than 26t of rubber-tyred road roller 1, 2 watering cars and 6 transport cars.

A cold in-place regenerator 380CR 1; 1 full-hydraulic single steel wheel vibratory roller with the weight of more than 20t and 1 paver; one 30T rubber wheel and 2 watering cars; 1 cement spreader vehicle and 1 stone spreader vehicle.

The material preparation comprises:

according to the design result of the mixing proportion, the required raw materials including foamed asphalt, crushed stone, cement and other materials are prepared, and the other auxiliary materials are determined according to the requirements of on-site observation.

S2, cold regeneration and milling of foamed asphalt:

firstly, milling a half-width surface layer with the length of 400 meters by an asphalt recycling machine, and transporting the surface layer to a specified position by a transport vehicle for stacking;

and milling the asphalt surface layer of the old road of the half-range carriageway outside the working width of the regenerating machine in advance by adopting a 1m milling machine, wherein the milling depth is the same as the regenerating depth, conveying the milled materials to the working surface to be regenerated through a conveying belt, and leveling by utilizing a forklift.

S3, cold regeneration of foamed asphalt and spreading of aggregate:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The broken stones are uniformly spread on the surface of the old road, the spreading amount of the broken stones is calibrated during construction, the broken stones are accurately spread according to the measurement designed according to the mix proportion, the broken stones are required to be uniformly distributed on the longitudinal section, the cross section can not be completely covered, because the mixture is folded towards the position of an intermediate conveyor belt when a regenerator is used for milling, milling and mixing, and the mixture can be continuously mixed in the folding process;

and after the gravel spreading is finished, correcting the spreading amount of each square gravel on site to determine the final spreading effect and quality.

S4, spreading the foamed asphalt cold recycled cement:

after the gravel spreading is finished, the cement is spread by using a spreading vehicle, the additive is also spread by using the spreading vehicle, and the cement mixing amount is calculated according to the use amount according to the design result of the mixing proportion.

The cement spreading amount should be calibrated on site or controlled locally, the cement spreading needs to be distributed uniformly on the longitudinal section, the cross section can not be covered completely, because the mixture is gathered to the position of the middle conveyor belt for mixing when the regenerating machine is used for milling and mixing. Once the cement spread is complete, the other vehicles, except for the reclaimer (including the ancillary equipment), must not enter the construction area on a uniform basis.

S5, cold regeneration operation of foamed asphalt:

and starting construction equipment, and loosening and mixing the pavement according to the set regeneration depth. The regenerated mixture is conveyed to a transport vehicle through a conveying belt of the regenerating machine, and the transport vehicle is conveyed to the position of the foamed asphalt cold regeneration paving starting point to wait. The regenerating unit must carry on the regeneration operation at the uniform velocity, continuously, must not change the speed or stop midway at will, the construction speed of regeneration should be 3-6m/min, the additional water consumption and asphalt consumption are determined by the design result of the mix proportion.

S6, synchronously paving cement, regenerating and milling on site:

after the foamed asphalt cold recycling machine regenerates and mixes, the original old road base layer is exposed, then a 1m milling machine is adopted to mill the old road base layer of the half-width roadway outside the working width of the recycling machine in advance, the milling depth is the same as the regeneration depth, the milled material is conveyed to a working surface to be regenerated through a conveying belt, and a forklift is used for leveling.

S7, synchronously paving cement cold regeneration spreading stones:

the gravel is scattered by a scattering vehicle, and the scattering amount per square meter is calculated according to the mixing proportion and the using amount. The aggregate should remain dry with local total amount control. The artificial spreading can be adopted when the condition is not met, but the artificial spreading is to be performed on the road surface in advance by using lime powder, the total amount is preferably controlled according to the area of 100m < 2 > to 300m < 2 >, and the spreading thickness is uniform.

S8, synchronously paving cement, cold regenerating and spreading cement:

the spreading method can be adopted by a spreading vehicle. The cement spreading amount should be calibrated on site or controlled locally, the cement spreading vehicle is generally 2.5m, the regeneration width is 3.8m, the spreading vehicle is required to convert one spreading step into the cement dosage with corresponding width, the cement spreading is required to be uniformly distributed on the longitudinal section, the cross section can not be completely covered, and the mixture can be folded to the position of the middle conveyor belt when the regenerating machine is used for milling and mixing.

S9, synchronously paving cement cold regeneration operation, comprising the following steps:

(1) Connecting all the machines to be constructed end to end in sequence at the construction starting point, and connecting the machines to be constructed with corresponding pipelines;

(2) And starting construction equipment, and milling and mixing the pavement according to the set regeneration depth. The regenerating unit must carry on the regeneration operation slowly, evenly, continuously, must not change the speed or pause in the middle of the journey arbitrarily, the construction speed of regeneration depends on the type of regenerating machine and regenerated material, preferably 3-6 m/min;

(3) In straight line and flat curve section without superelevation, the regenerator should start along the outside of the road width first, and then construct towards the inside of the road width gradually; setting a super-high flat curve section, wherein the regenerator starts along the inner side of the road width firstly and then constructs towards the outer side of the road width gradually;

(4) The regenerated road surface is marked by talcum powder and used as the direction guide of the regenerator to ensure that the regenerator moves along the right direction. When the downward cutting depth of the regenerating machine needs to be adjusted under special conditions, the downward cutting depth of the regenerating machine needs to be slowly adjusted (the downward cutting depth is adjusted within 3mm at one time), so that the phenomenon of obvious slab staggering is avoided, and the height difference is avoided when a subsequent spreading machine spreads;

(5) A special person should follow the regenerating machine to check the regenerating depth, the cement content and the water content at any time, and the operator of the regenerating machine is matched for adjustment;

(6) 4-5 persons are arranged behind the regenerating machine to treat the side line segregation and clean impurities in the mixture and excess materials at the initial position of each tool so as to prevent the longitudinal joint, the transverse joint, the flatness and the compactness of the regenerated material from being influenced;

(7) In the construction process, when the gradation, the regeneration depth and the water injection amount of the mixture are in any doubt, the construction is stopped, and the construction is continued after the problems are solved.

S10, synchronously paving the cement cold recycling pavement, and specifically comprises the following steps:

(1) During paving construction, attention should be paid to well control of the transverse slope and the thickness;

(2) In the paving process, the amplitude of the screed plate and the vibration frequency of the rammer are reasonably selected. Generally, the cold recycled mix is preferably compacted initially by using a "ram vibration frequency greater than screed amplitude". The gap at the widened and hinged part of the ironing plate is carefully adjusted to be tight, so that the trace on the surface of the paved road is prevented;

(3) The height of the material level sensor is controlled in the spreading process of the spreading machine, so that the spiral feeder in the material storage box is always embedded into the cold recycling mixture to be not less than 3/4 of the height of the cold recycling mixture, and the segregation of the cold recycling mixture in the spreading process is reduced. When the artificial paving or repairing is carried out, a spade buckling process is adopted, and a flat throwing method is not suitable; the cold recycling mixture is paved and leveled at the same time, the hand strength is light and the hand strength is consistent, and the artificial segregation of the cold recycling mixture is avoided;

(4) The ironing plate of the paver must be spliced tightly without gaps, so that pavement is prevented from being pulled out of streaks by the clamped aggregate;

(5) When the spreader is installed and operated, the measures of reducing the height above the ground of a front baffle plate of the spreader and preventing the segregation of the mixture are taken, a special person is arranged behind the spreader to eliminate the segregation phenomenon, the concentrated part of the local coarse aggregate is removed, and the new mixture is filled;

(6) Flatness control: after the paver is paved, a quality inspector uses a three-meter ruler to detect the flatness in time, particularly the flatness of the start-stop position of the paver, and places which do not meet the requirements are leveled manually in time;

(7) The longitudinal lap joint is collected by using a manual push rake, so that the road roller is not higher than the ground when rolling.

S11, synchronously paving cement, cold regeneration and rolling: the machine body comprises the following steps:

(1) The compaction construction flow is suggested as follows:

(2) During the rolling process, the surface of the regeneration layer should be kept wet all the time, if the water evaporation is too fast, the water should be sprinkled for supplement in time, but the water amount should not be too large.

(3) In order to avoid the situation that the mixture is pushed to generate a hug during rolling, the driving wheel is rolled towards the paver from the outer side to the center during rolling, the driving wheel is rolled from low to high in an ultrahigh section, and the driving wheel is rolled from low to high on a ramp;

(4) In the rolling process, if the phenomena of 'spring', looseness, peeling and the like exist, the mixture is turned over in time and is re-mixed (a proper amount of cement is added) or is treated by other methods, so that the quality requirement is met.

(5) After each section of rolling is finished and the compaction degree is checked to be qualified, the foam asphalt on-site regeneration construction (which must be finished within the initial setting time of cement) is carried out immediately.

S12, cold regeneration and paving of foamed asphalt:

after the in-situ cold recycling rolling of the cement is finished and the compactness is detected to be qualified, the foamed asphalt cold recycling paver is in place, the transport vehicle filled with the foamed asphalt mixture is butted with the paver, paving is carried out by the paver, and a paving coefficient is formulated according to the model of the paver. And the thickness and the flatness of the middle aluminum alloy beam are controlled. The thickness flatness of the regeneration layer is strictly controlled, and the transverse gradient of the road arch is ensured to meet the design requirement.

S13, cold regeneration and rolling of foamed asphalt, which specifically comprises the following steps:

(1) The method comprises the following steps that 1 vibration roller is used for rolling behind each paver, the length of one rolling is about 100m, then 1 single steel wheel roller and 1 rubber wheel roller are used for rolling respectively, the layers are clear, and obvious boundary marks are set;

(2) The rolling must follow the principle of 'light first then heavy, slow first then fast, static first then vibration, edge first then medium, low first then high';

(3) Compacting and planning rolling combination, namely vibrating the front and the back of the double-steel-wheel road roller 1 time under static condition → rolling the front and the back of the vibratory road roller 3 times under large vibration condition → stabilizing the pressure of the rubber wheel 4 times → static pressing the double steel wheels 1 time. And (4) pressing until no wheel mark exists, detecting the compaction degree by using a sand filling method at any time in the rolling process, and repeatedly pressing when the compaction degree is unqualified until the detection reaches the compaction degree requirement. After the detection that the compaction degree meets the requirement, the rolling finishing time of the foamed asphalt should be controlled to be completed before the initial setting time of the base cement.

S14, health preserving and traffic opening:

(1) When the health preserving is carried out under the condition of closed traffic, natural health preserving can be carried out, measures are not generally needed, and vehicles are forbidden to pass during the health preserving period;

(2) When the core drilling machine of a drill bit with the diameter of 150mm is used for the regeneration layer, complete base layer and surface layer core samples can be taken out, and the curing can be finished;

(3) After curing, traffic needs to be opened, and a layer of slow-breaking emulsified asphalt is timely sprayed after compaction, wherein the spraying amount is preferably 0.3kg per square meter to 0.6kg per square meter.

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