CN111172845A - Double-layer synchronous continuous-paving continuous-pressing integral forming construction method for water-stable large-thickness double-unit - Google Patents
Double-layer synchronous continuous-paving continuous-pressing integral forming construction method for water-stable large-thickness double-unit Download PDFInfo
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- CN111172845A CN111172845A CN202010008375.8A CN202010008375A CN111172845A CN 111172845 A CN111172845 A CN 111172845A CN 202010008375 A CN202010008375 A CN 202010008375A CN 111172845 A CN111172845 A CN 111172845A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
- E01C19/18—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/27—Rollers therefor; Such rollers usable also for compacting soil with elastically-deformable rolling elements, e.g. pneumatic tyres
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
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- Road Paving Structures (AREA)
Abstract
The invention provides a double-layer synchronous continuous-paving continuous-pressing integral forming construction method for a double-unit with large water stability and large thickness, wherein in an initial setting period, the double-unit is synchronously paved and rolled in a layered manner one after another, the distance between the two units is 45-55 meters, and the total thickness of a base layer is combined and completed, wherein the two units respectively comprise an anti-segregation paving machine, a vibration road roller and a kneading wheel tyre type road roller. The flatness of the structural layer can be effectively improved by continuous and uninterrupted paving; the two layers are paved continuously in a short time, the bonding between the two layers is enhanced, an integral plate which is integrated up and down is convenient to form, the layered health preservation is not needed, the interlayer combination process and materials are simplified, the continuous flow line operation of the base layer is realized, and the one-step completion is realized.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method.
Background
The design thickness of the semi-rigid base layer of the high-grade highway in China is generally 20-40cm, the thicknesses of the base layer and the subbase layer are 50-60cm in total, and due to the limitation of the performances of paving and compacting machines, the paver cannot meet the requirement of one-time paving with large width and large thickness, and a common compactor cannot meet the compaction requirement of a water-stable base with the thickness of more than 20 cm. For a long time, the cement stabilized base layer is paved by adopting a layering parallel machine, the upper construction layer and the lower construction layer of the construction procedure are not firmly bonded, the flatness is unsatisfactory, longitudinal joints are difficult to process, transverse joints are numerous, the interference of human factors is great, the quality is difficult to ensure, the construction is isolated, the construction efficiency is low, and the like.
For the reconstruction and expansion project, because the widening section and the reverse excavation section of the reconstruction and expansion project are uniformly divided into a plurality of layers for paving and rolling, and the interlayer combination treatment and the curing process are added, the construction process is more, and the construction period is long, thus the problem is solved.
Taking the reverse excavation part as an example, the weak parts such as the reverse excavation of the pavement are narrow in the construction space for the water-stable backfill, only one material conveying vehicle can be accommodated for passing, and the next material conveying vehicle can continue to carry out the reverse unloading after the material conveying vehicle is driven out of the ramp according to the conventional ramp filling mode. The dumper is long in running time, the paving efficiency is seriously reduced, meanwhile, the ramp cushion is complex in link establishment, the cushion establishment engineering amount is large, and the construction needs to be timely cleaned when reaching the ramp position, so that the construction efficiency is greatly reduced.
The waiting time for the back-and-forth movement of the paver and the road roller is long, the secondary paving joint treatment takes time and labor, the whole process is not smooth, and the construction efficiency is greatly reduced. The rainwater accumulated water in the excavation groove can not be removed in time, and the construction period is prolonged.
The single-unit double-layer continuous paving process has the process connection problem due to the adoption of multi-layer continuous paving, the disturbance damage to the initially-solidified lower layer is inevitably formed in real time by the upper layer, the machine can be repeatedly lifted, the number of road surface joints and transverse seams is large, and the road surface flatness is poor; all the wheel tracks of the transport trolley are superposed at the bottom of the excavated groove, and the phenomena of spring, slurry turning and disturbance are inevitable at the old road bed at the bottom of the groove.
Disclosure of Invention
The invention aims to provide a double-layer synchronous continuous-paving continuous-pressing integral forming construction method for a water-stable large-thickness double-unit, which overcomes the technical problems in the prior art.
Therefore, the technical scheme provided by the invention is as follows:
the double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method for the water-stable large-thickness building comprises the steps that in an initial setting period, double units are synchronously paved and rolled in a layered mode in a front-to-back mode, the two units are combined, and the total thickness of a base layer is finished, wherein the distance is 45-55 m;
the two sets of the vibration road roller comprise an anti-segregation paver, a vibration road roller and a rubbing tyre type road roller, the vibration road roller comprises a single steel wheel vibration road roller and a double steel wheel vibration road roller, the anti-segregation paver comprises a cement paste spraying device, the anti-segregation paver, the vibration road roller and the rubbing tyre type road roller are sequentially constructed in the paving process, the anti-segregation paver sprays cement paste while paving, the first set resists the segregation paver to continuously feed materials through a skip car or a lateral material transfer car, the second set resists the segregation paver to continuously feed materials through the lateral material transfer car, and the materials are paved simultaneously.
The rolling comprises pre-pressing, re-pressing and final pressing.
And before paving, compacting and sprinkling water to the roadbed at the construction section.
The elevation of the paved mixture is checked by adopting a wire hanging method in the paving process of the anti-segregation paver.
During prepressing, a double-steel-wheel vibratory roller is adopted to roll from low to high, the left and right edges are respectively left for 30-50cm without shoulder soil or a template, when the shoulder soil or a template is supported, the double steel wheels directly roll along the shoulder soil or the template, the roller is subjected to uniform static pressure when advancing and retreating at the walking speed of 3.5km/h, each wheel is overlapped for 30cm, and a stop joint forms a 45-degree trapezoid to roll once.
The repressing process comprises the following steps:
step 1) respectively advancing and retreating by using a single steel wheel vibratory roller to roll once, wherein each wheel is overlapped by 30cm, the left and right edges are left for 30cm without rolling when no template or road shoulder soil exists, and the left and right edges are left for 10cm without rolling when the road shoulder soil exists or a template is supported;
step 2) adopting a double-steel-wheel vibratory roller to respectively advance and retreat the non-rolled parts of the left and right sides of the vibratory roller for one time at a walking speed of 2.5 km/h;
step 3) rolling by using a single steel wheel vibratory roller, wherein the walking speed is 2.5km/h, and rolling is carried out for four times in a mode of uniformly vibrating in a low frequency mode and overlapping each wheel by 30 cm;
and 4) after the single-steel-wheel vibratory roller in the step 3) rolls once when going forward and backward, adding water to the roller and kneading the roller by using a rubber-tyred roller, and overlapping 3 tires during rolling.
And during final pressing, rolling by adopting a double-steel-wheel vibratory roller, wherein the traveling speed of the roller is 2.5-3km/h, rolling twice for smoothing and trimming in a mode of static pressure during advancing, vibration pressure during retreating and 1/3-1/4 wheel overlapping of each wheel.
The method further comprises joint processing, wherein the joint processing comprises starting joint processing, joint processing in the rolling process and stopping joint processing.
And (3) in the re-compaction process, carrying out compaction degree detection by using a sand filling method, carrying out overall full thickness detection, carrying out upper layer and lower layer detection, carrying out final compaction after the lower half layer compaction degree is qualified, and repeating the step 2) if the detected compaction degree is unqualified, wherein if the thickness after compaction is less than 30cm, carrying out compaction degree detection after the rolling in the step 1) is finished.
The processing method of the starting joint comprises the steps of manually inclining the paved starting joint to a slope with the gradient smaller than 45 degrees, and adopting a double-steel-wheel road roller to obliquely press the joint twice before the joint;
the joint processing method in the rolling process comprises the following steps:
during prepressing, a double-steel-wheel vibratory roller is adopted to roll from high to low, static pressure is equalized when the double-steel-wheel vibratory roller moves forward and backward, a 45-degree arc line is drawn when a first wheel is pressed to a position ten meters away from an anti-segregation paver to roll, and then trapezoidal rolling is carried out twice when each wheel is overlapped by 30cm and a stop joint is in the arc line;
in the re-pressing process, the first stopping position of the single-steel-wheel vibratory roller cannot be subjected to arc line, the distance between the later stopping position and the previous rolling joint is 30cm, and then the trapezoidal rolling joint formed by stopping the single-steel-wheel vibratory roller is subjected to three times of rolling back and forth by adopting uniform forward and backward vibration in an arc line scratching mode of the double-steel-wheel vibratory roller;
the shutdown joint treatment method comprises the following steps:
during prepressing, a double-steel-wheel vibratory roller is stopped when the distance between the double-steel-wheel vibratory roller and the joint is 50cm, during re-pressing, a single-steel-wheel vibratory roller is started to press the working surface of the single-steel-wheel vibratory roller from bottom to top after turning around, and is used for making a single transverse seam or a step transverse seam after the joint is pressed at a position of the steel wheel, which is 50cm away from the joint, is stopped and then pressed at a static pressure.
The invention has the beneficial effects that:
the flatness of the structural layer can be effectively improved by continuous and uninterrupted paving; the two layers are paved continuously in a short time, so that the bonding between the two layers of water stability can be enhanced, an integral plate which is integrated up and down is convenient to form, the layered health preservation is not needed, the interlayer combination process and materials are simplified, the one-time completion of the continuous flow process of the base layer is realized, and the cost is saved. Eliminates the hidden quality trouble generated by rolling the upper layer after the initial setting time of the cement is exceeded.
By adopting the continuous uninterrupted operation of the two units, the paver and the road roller do not need to back and forth, the reversing time of the lifter, the time for waiting for rolling the lower bearing layer, the in-place debugging time of the paver and the time for processing the joint by secondary paving are saved, continuous and uninterrupted paving can be formed, and the construction efficiency is greatly improved.
The lateral feeding can ensure the synchronous operation of the first unit and the second unit of the reconstruction and extension and new construction. For backfilling of the reverse excavation part, the transport trolley can avoid passing in the excavation groove, a step of lining up a ramp for transporting the transport trolley is omitted, the problem of limited passing is solved, the damage of a lower bearing layer is avoided, and manpower and backing time are saved.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of the two-unit site layout of the construction method of the present invention.
In the figure:
description of reference numerals:
1. a first unit; 2. a second unit; 3. a first skip car; 4. a first anti-segregation paver; 5. a vibratory roller I; 6. rubbing a tire type road roller I; 7. a skip II; 8. a lateral material transfer vehicle; 9. a second anti-segregation paver; 10. a second vibratory roller; 11. and rubbing a tire type road roller II.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method, wherein in an initial setting period, double units are synchronously paved and rolled continuously in layers one by one and the other, and are combined to complete the total thickness of a base layer, wherein the distance is 45-55 meters;
the two sets of the vibration road roller comprise an anti-segregation paver, a vibration road roller and a rubbing wheel tyre type road roller, the vibration road roller comprises a single steel wheel vibration road roller and a double steel wheel vibration road roller, the anti-segregation paver comprises a cement paste spraying device, the anti-segregation paver, the vibration road roller and the rubbing wheel tyre type road roller are sequentially constructed in the paving process, the anti-segregation paver sprays cement paste while paving, the first set 1 continuously supplies materials to the anti-segregation paver through a skip car or a lateral material transfer car, the second set 2 continuously supplies materials to the anti-segregation paver through the lateral material transfer car, and the materials are paved simultaneously.
As shown in fig. 1, the two units are a first unit 1 and a second unit 2, respectively, the first unit 1 includes an anti-segregation spreader 4, a vibratory roller 5 and a kneading tire type roller 6, which are sequentially constructed from front to back, and a skip 3 directly and continuously loads the anti-segregation spreader 4 in front of the roller. In special cases, such as protecting the front roadbed, the first unit adopts a lateral material transfer vehicle to supply materials from the side of the paved road.
The second unit 2 comprises a second anti-segregation paver 9, a second vibratory roller 10 and a second rubber-tired roller 11 which are sequentially constructed from front to back, a second skip car 7 feeds the lateral material transfer trolley 8, and the lateral material transfer trolley 8 continuously feeds the anti-segregation paver 9 on the side surface.
The invention is suitable for once construction of the water-stable reverse excavation backfill, the reconstruction and expansion widening section and the water-stable layer of the pavement of the new construction with the width and the thickness (21-40 cm) of the highway reconstruction and expansion engineering. The paving thickness of the anti-segregation paver can reach 50cm, the width can reach more than 16m, a screw driving box of the anti-segregation paver adopts a gear transmission mode, has large torque and high driving power, can evenly convey materials at low speed by adopting the principles of full-buried screws, closed material troughs and secondary forced extrusion stirring, resists material segregation, and prevents the materials from rolling down to form vertical segregation, adopt elasticity rubber slab or hang down the curtain formula chain to the striker plate before the spiral and seal, adopt the cantilever type structure of elasticity rubber slab or hang down the curtain formula chain to the off-load mouth of spiral outer end department, control (centre joint department) and respectively install a set of reverse spiral blade face of angularly adjustable additional as required, reduce spiral support (spiral suspension) cross section size, install transition blade additional, widen the silo, measures such as increase paver hopper prevent that cement from stabilizing the aggregate and producing the segregation in the work progress. The cement paste spraying device nozzles are arranged at the pushing and editing position in front of the paver, the side surfaces of the cement paste spraying device nozzles are arranged at two sides of the crawler track trolley frame, the cement paste spraying device nozzles can synchronously work with the paver, and the influence of an interlayer processing link on the process is reduced.
The flatness of the structural layer can be effectively improved by continuous and uninterrupted paving; the two layers are paved continuously in a short time, so that the bonding between the two layers of water stability can be enhanced, an integral plate which is integrated up and down is convenient to form, the layered health preservation is not needed, the interlayer combination process and materials are simplified, the one-time completion of the continuous flow process of the base layer is realized, and the cost is saved. From discharging to final pressing, the time is controlled within 3 hours, and the quality hidden trouble generated by rolling the upper layer after the initial setting time of cement is exceeded is eliminated.
When the pavement is paved, the material supply is continuous, the scraper and the spiral are not broken, the material level in the trough is consistent, the spiral is conveyed at a constant speed, the initial density uniformity of the paved pavement is consistent, and the paved pavement does not need to be separated and paved transversely, longitudinally, vertically and in a sheet shape. The spreading speed is not lower than 1.5 m/min.
Example 2:
on the basis of embodiment 1, the embodiment provides a water-stable large-thickness double-layer synchronous continuous-paving continuous-pressing integral forming construction method, wherein the pressing comprises prepressing, re-pressing and final pressing.
During prepressing, a double-steel-wheel vibratory roller is adopted to roll from low to high, the left and right edges are respectively left for 30-50cm without shoulder soil or a template, when the shoulder soil or a template is supported, the double steel wheels directly roll along the shoulder soil or the template, the roller is subjected to uniform static pressure when advancing and retreating at the walking speed of 3.5km/h, each wheel is overlapped for 30cm, and a stop joint forms a 45-degree trapezoid to roll once.
The repressing process comprises the following steps:
step 1) respectively advancing and retreating by using a single steel wheel vibratory roller to roll once, wherein each wheel is overlapped by 30cm, the left and right edges are left for 30cm without rolling when no template or road shoulder soil exists, and the left and right edges are left for 10cm without rolling when the road shoulder soil exists or a template is supported;
step 2) adopting a double-steel-wheel vibratory roller to respectively advance and retreat the non-rolled parts of the left and right sides of the vibratory roller for one time at a walking speed of 2.5 km/h;
step 3) rolling by using a single steel wheel vibratory roller, wherein the walking speed is 2.5km/h, and rolling is carried out for four times in a mode of carrying out uniform low-frequency vibration in forward and backward directions and overlapping each wheel by 30 cm;
and 4) after the single-steel-wheel vibratory roller in the step 3) rolls once when going forward and backward, adding water to the roller and kneading the roller by using a rubber-tyred roller, and overlapping 3 tires during rolling.
And during final pressing, rolling by adopting a double-steel-wheel vibratory roller, wherein the traveling speed of the roller is 2.5-3km/h, rolling twice for smoothing and trimming in a mode of static pressure during advancing, vibration pressure during retreating and 1/3-1/4 wheel overlapping of each wheel.
Example 3:
on the basis of embodiment 1, the embodiment provides a water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method, which further comprises compacting and watering a construction section roadbed before paving.
The roadbed at the construction section is checked in advance, and a 36T single-steel-wheel vibratory roller is required for reinforcing when the compactness is insufficient. Before paving, sprinkling water on the roadbed again to ensure the roadbed humidity, preventing the roadbed from drying and absorbing water to stabilize the moisture of the lower layer and leading to the loosening of the lower layer, and adopting a wire hanging method to check the elevation of the once-paved mixture in the paving process.
Example 4:
on the basis of embodiment 1, the embodiment provides a water-stable large-thickness double-layer synchronous continuous-paving continuous-pressing integral forming construction method, which further comprises joint treatment, wherein the joint treatment comprises starting joint treatment, joint treatment in a rolling process and stopping joint treatment.
The processing method of the starting joint comprises the steps of manually inclining the paved starting joint to a slope with the gradient smaller than 45 degrees, and adopting a double-steel-wheel road roller to obliquely press the joint twice before the joint;
the joint processing method in the rolling process comprises the following steps:
during prepressing, a double-steel-wheel vibratory roller is adopted to roll from high to low, static pressure is equalized when the double-steel-wheel vibratory roller moves forward and backward, a 45-degree arc line is drawn when a first wheel is pressed to a position ten meters away from an anti-segregation paver to roll, and then trapezoidal rolling is carried out twice when each wheel is overlapped by 30cm and a stop joint is in the arc line; preventing the joint from being cluttered.
In the re-pressing process, the first stopping position of the single-steel-wheel vibratory roller cannot exceed the steps of the double steel wheels for one time, and the distance between the stopping position of each subsequent rolling and the previous rolling joint is 30cm, so that the stopping and the upwrapping at the same point are prevented; then, carrying out three-time rolling on a trapezoidal rolling joint formed by stopping the single-steel-wheel vibratory roller by adopting arc line cutting mode of the double-steel-wheel vibratory roller to carry out uniform vibration in a forward and backward mode; the rolled road surface and the non-rolled road surface form smooth transition, and the flatness of the rolling joint is ensured.
The shutdown joint treatment method comprises the following steps:
during prepressing, the double-steel-wheel vibratory roller is stopped (the joint is not crushed) when the distance between the double-steel-wheel vibratory roller and the joint is 50cm, the single-steel-wheel vibratory roller is started to work on the working surface during re-pressing, the joint is vibrated from bottom to top after turning around, the joint is pressed under static pressure after vibration is stopped at the position of the steel wheel 50cm away from the joint when rolling downwards (the joint slope is prevented from being pressed too long), and after rolling, a single transverse seam or a step transverse seam is determined according to the length of the joint slope. If step transverse seams are made, the normal passing of the crawler belt of the paver is ensured. The receiving joint can be called a construction joint.
Example 5:
on the basis of embodiment 2, this embodiment takes an expansion project of four-to-eight improvement of the economic and green expressway as an example, and the continuous-paving continuous-pressing one-step integral forming construction is realized by adopting the invention.
The full length of the Jiqing expressway reconstruction and extension project is 309 kilometers, and a bidirectional extension standard of four lanes to eight lanes is adopted. And a cement stabilized gravel layer (cement stabilized layer) is 54/56cm, and reverse excavation backfill reinforcement measures are adopted for improving the structural strength of the base layer pavement of the splicing belts of the new road and the old road.
The equipment comprises an anti-segregation spreading machine of a cement paste spraying device, a vibration road roller, a rubbing tire type road roller, a lateral material conveying vehicle and a skip car.
Taking the total thickness of the water-stable base layer as 54cm as an example, the synchronous operation of two units is realized, the layered paving and compacting of each layer of 18cm is changed into the synchronous large-thickness rapid continuous paving and continuous compacting of two layers of 27cm, two construction procedures, two interlayer combination treatment procedures and two water-stable maintenance procedures can be omitted, the disturbance problem of the compacting on the lower bearing layer is solved, the defects of long construction period and long maintenance time are overcome, the road surface hardening strength is improved, and the construction period is ensured.
The lateral material transfer vehicle realizes lateral delivery of water-stable mixture, and can ensure synchronous operation of a first unit and a second unit of reconstruction and extension and newly-built projects; for backfilling of the reverse excavation part, the transport trolley can also avoid passing in the excavation groove.
And (3) rolling:
1) prepressing (initial pressure, stable)
Rolling paragraphs: the length of the rolling section is determined according to the paving speed and the fluency degree, and the length of the rolling section with large thickness is 30-50 m generally.
Shoulder slipping prevention and rolling: when two side supporting templates or soil shoulders are arranged, the YZC13/17 type double-steel-wheel full hydraulic self-propelled vibratory roller is adopted to welt and static press the left and right side parts, so that the left and right side parts are firstly compacted, and the material is pushed towards two sides when re-pressing is reduced.
When the two sides are not provided with templates and road shoulders, the YZC13/17 type double-steel-wheel full-hydraulic self-propelled vibratory roller is used for statically pressing the left side edge part and the right side edge part at a distance of 30-50cm from the edges, so that the left side edge part and the right side edge part are firstly compacted, and the material is pushed towards the two sides when the re-compaction is reduced.
Voltage stabilization: a YZC13/17 type double-steel-wheel full-hydraulic self-propelled vibratory roller is adopted from high to low, the roller moves forwards and backwards at a walking speed of 2.5km/h to realize uniform static pressure, a first wheel is pressed to a position ten meters away from a paver to form an arc line of 45 degrees for rolling, and then trapezoidal rolling with 30cm overlapping each wheel and a halt joint in the arc line is performed twice (every time the roller moves forwards and backwards, the rolling is performed twice, the same is performed below), so that the paved water stabilizing material is pre-pressed into a stable state.
2) Repression
Preparing equipment: when the temperature is lower than 8 ℃ or the road roller does not vibrate continuously for several days, starting and stopping vibration for several times are carried out on the roadbed, so that the road roller is in a hot-car state, and water-filling and layer-stabilizing construction operation can be carried out after the vibration of the road roller is stable.
Rolling: a YZ36 self-propelled vibratory roller is adopted for rolling, the walking speed is 2.5km/h, the forward and backward movement is low in frequency, each wheel is rolled twice in a 30cm overlapping mode, 10cm of left and right edges are reserved when road shoulder soil or a template exists, 30cm of left and right edges are reserved when no template exists, the left and right edges are not rolled (the shoulder sliding is prevented), each wheel is rolled and stopped, the distance between the rolling and stopped joint and the previous rolling and stopped joint is 50cm, and the smooth running, the uniform speed and no impact of the roller must be guaranteed during the rolling and rolling. Stopping or stopping and starting vibration on the working surface strictly; and strictly forbidding to make direction and adjust the machine position on the working surface which is not rolled. The vibration starting and stopping are stable and timely, and uniform pressure leakage is achieved.
And when the YZ36 self-propelled vibratory roller rolls twice, the YZC13/17 type double-steel-wheel full-hydraulic self-propelled vibratory roller is adopted, and the left and right 10 (30) cm parts which are not rolled are vibrated and rolled twice in the front and back directions, so that the edges are compacted uniformly.
Rolling by adopting a YZ36 self-propelled vibratory roller at the walking speed of 2.5km/h, rolling for four times in a mode of uniform low-frequency vibration in forward and backward movement and 30cm overlapping of each wheel, wherein the roller must be ensured to run stably and have no impact phenomenon at a uniform speed during rolling; stopping or stopping and starting vibration on the working surface strictly; and strictly forbidding to make direction and adjust the machine position on the working surface which is not rolled. The vibration starting and stopping are stable and timely, and uniform pressure leakage is achieved.
A37-ton rubber-tyred roller is adopted to alternately rub and roll in the rolling process of the YZ36 self-propelled vibratory roller, the YZ36 self-propelled vibratory roller alternately rubs and rolls for two times every time when rolling for two times for the 37-ton rubber-tyred roller, 3 tires are overlapped every time, so that surface stones are rubbed and fallen, the surface stones are prevented from jumping and loosening, and the ground surface is properly supplemented with atomized water by the rubber-tyred atomizing water according to the actual rolling condition and the weather condition.
After the YZ36 self-propelled vibratory roller rolls, the trapezoid rolling joint formed by stopping the YZ36 self-propelled vibratory roller is rolled back and forth three times by adopting front and back vibration of the YZC13/17 type double-steel-wheel full-hydraulic self-propelled vibratory roller in an arc line drawing mode, so that the rolled road surface and the non-rolled road surface form smooth transition, and the flatness of the rolling joint is ensured.
Compaction detection
And the laboratory adopts a sand filling method to detect the compaction degree, the whole full thickness can be detected, the detection can be carried out on the upper layer and the lower layer, the final pressing can be carried out after the compaction degree is qualified, and if the detection is unqualified, the secondary pressing process of the re-pressing is determined according to the compaction degree data to be pressed once. If the thickness after compaction is less than 30cm or the roadbed per se is hard, the compaction degree detection is carried out after the second re-compaction.
3) Final pressure (light)
Rolling by using a YZC13/17 type double-steel-wheel full-hydraulic self-propelled vibratory roller, wherein the walking speed of the roller is 2.5-3km/h, rolling twice by adopting a mode of forward static pressure, backward vibratory pressure and overlapping 1/3 wheel of each wheel for light collection and trimming.
Example 6:
on the basis of embodiment 2, in this embodiment, taking a pine-passing highway construction project as an example, a highway construction project from pine origin to tonghu elm (gmon boundary) section of a highway in the family of the Jilin, sidecar is a highway with a total length of 206.037 km and a roadbed width of 27.0 m and four lanes, and the design speed is 120 km/h; the base course is designed with cement stabilized macadam with the thickness of 54 cm.
In the traditional water-stable construction, two spreading machines are adopted and spread by 3 layers of 18cm, the interlayer combination is poor, the whole plate block structure cannot be formed, the machine joint seam has quality defects, the curing period is long, the cost is high, the interlayer combination is labor-consuming and time-consuming, the double-machine parallel-spreading transverse flatness is poor, and the like.
By adopting the method, the three water-stable layers are changed into two layers (each layer is 27 cm), and the two units synchronously (laterally feed) and continuously pave and continuously press the large-thickness quick-speed steel plates and the steel plates at the initial setting stage for one-time integral forming construction.
When paving, the distance between the two units (the first unit and the second unit) is 50 meters, and the interlayer combination can be ensured by shortening the paving distance, so that the integral molding of the core sample is realized.
And (3) rolling: the first machine set rolling section is controlled to be about 30 meters.
Firstly, drawing an arc by 45 degrees by adopting a first wheel of a 22-ton single-steel-wheel road roller, then advancing from low to high, performing static pressure, backing, vibrating and pressing, and then forming a step shape not exceeding that of a double-steel-wheel step;
the second time, a 36-ton single steel wheel road roller is adopted to vibrate forwards and backwards for 2 times to form a step shape;
and thirdly, a 30-ton rubber-wheel road roller is adopted to supplement water and knead for 2 times according to conditions.
The rolling distance of the second machine set is controlled to be about 50 meters.
Firstly, drawing an arc by 45 degrees by adopting a first wheel of a 13-ton double-steel-wheel road roller, and then advancing from low to high, backing up by static pressure and vibrating and pressing, and forming a step shape;
the second time, the 22-ton single steel wheel road roller is adopted to move forwards and backwards and respectively vibrate once to form a ladder shape.
In the third time, a 36-ton single-steel-wheel road roller is adopted to vibrate for 2 times in a step shape after going forward and backward;
a 30-ton rubber-tyred road roller is adopted for the fourth time to supplement water and rub according to conditions;
and the fifth time, adopting a 13-ton double-steel-wheel road roller to collect the light.
Wherein, the 36-ton single steel wheel roller and the YZ36 self-propelled vibratory roller are the same roller.
In conclusion, the flatness of the structural layer can be effectively improved by continuously and uninterruptedly paving the structural layer; the two layers are paved continuously in a short time, so that the bonding between the two layers of water stability can be enhanced, an integral plate which is integrated up and down is convenient to form, the layered health preservation is not needed, the interlayer combination process and materials are simplified, the one-time completion of the continuous flow process of the base layer is realized, and the cost is saved. Eliminates the hidden quality trouble generated by rolling the upper layer after the initial setting time of the cement is exceeded.
By adopting the continuous uninterrupted operation of the two units, the paver and the road roller do not need to back and forth, the reversing time of the lifter, the time for waiting for rolling the lower bearing layer, the in-place debugging time of the paver and the time for processing the joint by secondary paving are saved, continuous and uninterrupted paving can be formed, and the construction efficiency is greatly improved.
The lateral feeding can ensure the synchronous operation of the first unit and the second unit of the reconstruction and extension and new construction. For backfilling of reverse excavation parts, the transport trolley can also avoid passing in the excavation groove, a link of laying a ramp for the transport trolley is omitted, the problem of limited passing is solved, and manpower and backing time are saved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. The double-layer synchronous continuous-paving continuous-pressing integral forming construction method for the water-stable large-thickness double-unit is characterized by comprising the following steps of: in the initial setting period, the two units are synchronously paved and rolled continuously in layers one by one and the other, the two units are combined to finish the total thickness of the base layer, and the distance between the two units is 45-55 meters;
the two sets of the vibration road roller comprise an anti-segregation paver, a vibration road roller and a rubbing wheel tyre type road roller, the vibration road roller comprises a single steel wheel vibration road roller and a double steel wheel vibration road roller, the anti-segregation paver comprises a cement paste spraying device, the anti-segregation paver, the vibration road roller and the rubbing wheel tyre type road roller are sequentially constructed in the paving process, the anti-segregation paver sprays cement paste while paving, the first set (1) resists the segregation paver to continuously feed through a skip car or a lateral material transfer car, the second set (2) resists the segregation paver to continuously feed through the lateral material transfer car, and the edge material is paved simultaneously.
2. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 1, characterized in that: the rolling comprises pre-pressing, re-pressing and final pressing.
3. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 1, characterized in that: and before paving, compacting and sprinkling water to the roadbed at the construction section.
4. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 1, characterized in that: the elevation of the paved mixture is checked by adopting a wire hanging method in the paving process of the anti-segregation paver.
5. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 2, characterized in that: during prepressing, a double-steel-wheel vibratory roller is adopted to roll from low to high, the left and right edges are respectively left for 30-50cm without shoulder soil or a template, when the shoulder soil or a template is supported, the double steel wheels directly roll along the shoulder soil or the template, the roller uniformly presses the road when going forward and backward, each wheel is overlapped for 30cm, and a stop joint forms a 45-degree trapezoid to roll once.
6. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method as claimed in claim 2, wherein the re-pressing process comprises the following steps:
step 1) respectively advancing and retreating by using a single steel wheel vibratory roller to roll once, wherein each wheel is overlapped by 30cm, the left and right edges are left for 30cm without rolling when no template or road shoulder soil exists, and the left and right edges are left for 10cm without rolling when the road shoulder soil exists or a template is supported;
step 2) adopting a double-steel-wheel vibratory roller to respectively advance and retreat the non-rolled parts of the left and right sides of the vibratory roller for one time;
step 3) rolling by using a single-steel-wheel vibratory roller, and rolling for four times in a mode of uniformly vibrating in a low frequency mode and overlapping each wheel by 30 cm;
and 4) after the single-steel-wheel vibratory roller in the step 3) rolls once when going forward and backward, adding water to the roller and kneading the roller by using a rubber-tyred roller, and overlapping 3 tires during rolling.
7. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 2, characterized in that: and during final pressing, rolling by adopting a double-steel-wheel vibratory roller, wherein the traveling speed of the roller is 2.5-3km/h, rolling twice for smoothing and trimming in a mode of static pressure during advancing, vibration pressure during retreating and 1/3-1/4 wheel overlapping of each wheel.
8. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 2, characterized in that: the method further comprises joint processing, wherein the joint processing comprises starting joint processing, joint processing in the rolling process and stopping joint processing.
9. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 6, characterized in that: and (3) in the re-compaction process, carrying out compaction degree detection by using a sand filling method, carrying out overall full thickness detection, carrying out upper layer and lower layer detection, carrying out final compaction after the lower half layer compaction degree is qualified, and repeating the step 2) if the detected compaction degree is unqualified, wherein if the thickness after compaction is less than 30cm, carrying out compaction degree detection after the rolling in the step 1) is finished.
10. The water-stable large-thickness double-unit double-layer synchronous continuous-paving continuous-pressing integral forming construction method according to claim 8, characterized in that: the processing method of the starting joint comprises the steps of manually inclining the paved starting joint to a slope with the gradient smaller than 45 degrees, and adopting a double-steel-wheel road roller to obliquely press the joint twice before the joint;
the joint processing method in the rolling process comprises the following steps:
during prepressing, a double-steel-wheel vibratory roller is adopted to roll from high to low, static pressure is equalized when the double-steel-wheel vibratory roller moves forward and backward, a first wheel is rolled by drawing an arc line of 45 degrees when being pressed to a position ten meters away from an anti-segregation paver, and then each wheel is overlapped by 30cm, and a stop joint is rolled in a trapezoidal shape twice in the arc line;
in the re-compaction process, the first stop position of the single-steel-wheel vibratory roller cannot exceed the arc line, the distance between the next stop position and the previous rolling joint is 30cm, and then the trapezoidal rolling joint formed by stopping the single-steel-wheel vibratory roller is rolled back and forth for three times by adopting the arc line cutting mode of the double-steel-wheel vibratory roller to vibrate forwards and backwards;
the shutdown joint treatment method comprises the following steps:
during prepressing, a double-steel-wheel vibratory roller is stopped when the distance between the double-steel-wheel vibratory roller and the joint is 50cm, during re-pressing, a single-steel-wheel vibratory roller is started to press the working surface of the single-steel-wheel vibratory roller from bottom to top after turning around, and is used for making a single transverse seam or a step transverse seam after the joint is pressed at a position of the steel wheel, which is 50cm away from the joint, is stopped and then pressed at a static pressure.
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