CN111576125B - Construction method for transverse automatic feeding base layer - Google Patents
Construction method for transverse automatic feeding base layer Download PDFInfo
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- CN111576125B CN111576125B CN202010442088.8A CN202010442088A CN111576125B CN 111576125 B CN111576125 B CN 111576125B CN 202010442088 A CN202010442088 A CN 202010442088A CN 111576125 B CN111576125 B CN 111576125B
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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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
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
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Abstract
The invention discloses a construction method of a transverse automatic feeding base layer, which comprises the following steps: the method comprises the following steps of road shoulder construction, subbase construction and cleaning, cement stabilized base layer template installation, sprinkling water on the subbase layer for moistening, longitudinal feeding of a front cement stabilized base layer construction, rough surface construction, cement paste spraying, transverse feeding of a rear cement stabilized base layer construction and quality inspection, cement stabilized base layer maintenance and asphalt layer construction. The invention eliminates the defects of two-layer interval construction, one-time paving and one-time forming and longitudinal two-time overlapping and paving and one-time forming of the cement stabilized base layer, improves the quality, uniformity, integrity, continuity and flatness of the cement stabilized base layer and the comfort of the asphalt pavement, can effectively use common equipment for construction and prevent the early damage of the asphalt pavement, prolongs the service life of the pavement and reduces the operation and maintenance cost.
Description
Technical Field
The invention relates to the technical field of highway construction, in particular to a construction method of a transverse automatic feeding base course.
Background
The cement stabilized base course has the characteristics of high strength, large bearing capacity and low overall manufacturing cost of an asphalt pavement structure, is a road semi-rigid bearing layer which is preferentially adopted by developing countries, particularly along with the requirements of road traffic volume, continuous and rapid growth of heavy-duty vehicles and road use performance in the whole life cycle, the calculated thickness of the cement stabilized layer as a structural layer reaches about 40 cm, the calculated thickness of the cement stabilized layer can not be paved and rolled at one time under the compression mechanical power, the compression effect and uniformity, the mixture syntropy performance, the compression flatness, the damage restriction of the compression machinery to surface materials and the quality requirement of the base course, and the cement stabilized base course with the thickness of more than 20 cm is generally required to be paved, layered, discontinuously and rolled and constructed by various national specifications. Due to the fact that layered discontinuous construction exists and discontinuous weak conditions exist in interlayer bonding, a designed structural layer is changed into a plurality of structural layers, a design calculation model of the pavement structure is changed, due bearing capacity is reduced, and service time is shortened. Many technical and technical personnel continuously strive to search and practice a method which can meet the requirement of one-step forming of layered construction of a cement stable base course and can ensure interlayer continuity under the condition of the existing cement performance and mechanical power, so that the construction result can meet the design requirement to the maximum extent. The invention provides a construction method for transversely and automatically feeding and highly accurately paving a cement stabilized base layer formed at one time aiming at the defects of two-layer and multi-layer interval construction, one-time paving, rolling and forming and one-time longitudinal overlapping and paving and one-time forming of the cement stabilized base layer with the thickness of more than 20 cm, improves the quality, uniformity, interlayer continuity, integrity, flatness and comfort of an asphalt pavement of the cement stabilized base layer, can effectively use common equipment for construction and prevent the early damage of the asphalt pavement, prolongs the service life of the pavement and reduces the operation and maintenance cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a construction method of a transverse automatic feeding base layer, in particular to a construction method of a transverse automatic feeding high-precision paving one-step molding cement stabilization base layer. The large-thickness cement stable layer can be formed and constructed at one time, and the 3D digital intelligent paving control system is applied to improve the paving precision of each structural layer of the road pavement to one tenth of a millimeter; interlayer combination of layered construction of a large-thickness cement stable layer is effectively guaranteed; and the water resistance and the skid resistance of the upper layer of the asphalt are increased. The quality and the bearing efficiency of the cement stabilized base layer and the overall flatness of the pavement are improved, the water damage disease in the early stage of the asphalt pavement is prevented, and the construction and pavement operation and maintenance cost is reduced.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a construction method of a transverse automatic feeding base layer comprises the following steps:
step (1), road shoulder construction
The first shoulder and the second shoulder at the two ends of the route are rolled with the compaction thickness of each layer not more than 20 cm, and the compaction degree reaches more than 98% of the heavy compaction standard;
step (2), constructing and cleaning the subbase layer
Carrying out subbase construction on a road bed, and when the subbase is graded broken stones, blending, paving and rolling the crushed stones of various specifications according to the grading requirement;
step (3) installing cement stabilized base layer template
On the central separation zone or the subbase layer at the edge position of the inner side cement stabilization base layer, the fixing piece of the lateral template of the cement stabilization base layer is driven into the subbase layer and the road bed filling soil to support the installation of the connecting piece and correct the template of the cement stabilization base layer;
wetting the underlayer
After the installation construction of the subbase layer and the cement stabilization base layer template is finished, uniformly sprinkling water on the subbase layer for multiple times for wetting;
step (5), construction of cement stabilized base course of front layer of longitudinal feeding
According to the planned framing construction sequence, the paving and rolling machine is in place, and the front layer loose paving thickness value is adjusted and determined according to data obtained by test road construction; batching according to the mixing proportion of the cement stabilizing material, and then carrying out longitudinal feeding and paving:
when the cement stable mixture is transported to a paving site, the paving amplitude retreats to the front of a hopper of the paver, the paver is contacted with the rear wheel of the dump truck in a slow forward mode and pushes the dump truck to move forward, and the dump truck unloads the material into the hopper of the paver according to the paving speed to form longitudinal feeding and paving;
the system controls the cement stabilizing material to be spread, and the vibratory roller stabilizes the pressure firstly, then vibrates the pressure and then retracts the wheel track; rolling from low to high with overlapping wheel tracks, wherein each 10-20 m is a rolling section, and the rolling flatness and compaction quality at the sectional position of the rolling section are noticed;
step (6), rough surface construction of the front cement stabilization base layer
After the construction compactness of the front cement stabilized base layer is detected to be qualified, pressing the front cement stabilized base layer on the surface by using a land leveler with a comb-shaped rack arranged below a shovel blade, retreating and napping the surface, and performing rough construction; the tooth height of the comb-shaped rack is 5-10mm, and the tooth pitch is 5-10 mm;
step (7), spraying cement slurry
The rough construction of front cement stabilized base course surface is ended, and the cement with the same grade as the cement stabilized base course is used according to the water cement ratio of 1:0.5-1:1.0, spraying the cement paste on the cement stable base layer with the rough surface;
step (8), transversely feeding and constructing a rear cement stabilized base layer
The starting point of the rear cement stabilization base layer and the control time of each construction point are controlled to finish construction before the first time of the cement stabilization mixture of the first vehicle and the corresponding vehicle number and the delay time of the cement after corresponding water is added;
the self-dumping truck transports the cement stable mixture to the front of the other non-paving breadth of the paving site, retreats to the front of the hopper of the transverse feeder and slowly moves forwards, the hopper of the transverse feeder is contacted with the rear wheel of the self-dumping truck and pushes the self-dumping truck to move forwards, the self-dumping truck unloads the material into the hopper of the transverse feeder according to the paving speed, and the transverse feeder transports the cement stable mixture to the asphalt mixture paver of the paving breadth in a transverse conveyor belt feeding mode to be paved so as to form a transverse feeding paver; the speed of the transverse feeder and the speed of the asphalt mixture paver are kept synchronous;
step (9), curing the cement stabilized base layer;
and (10) constructing an asphalt layer.
Further, before the road shoulder construction, the method also comprises preparation work, which is specifically as follows:
selecting a digital intelligent paving control system, recalculating the plane, elevation and width control design values of each structural layer of the road according to the existing design node data of the road, and improving the precision of the plane, elevation and width data to one tenth of millimeter; providing or existing plane and elevation control piles and data according to design, rearranging the plane and elevation control net piles, simultaneously considering middle encryption control piles, and embedding; restoring or reestablishing a high-precision plane and elevation control network by combining the grades of the existing plane and elevation control network, and calculating and balancing; after the roadbed construction is finished, the elevation of the middle pile, the side piles and the middle control pile is measured again and calculated; inputting the recalculated design values of the plane, the elevation and the width of each structural layer of the road and the elevation values of the retest road bed into a digital intelligent paving control system; then, carrying out test section construction of each structural layer;
when the construction machinery or the mixture gradation changes, the construction of the test section is carried out again.
Further, in the step (3), the height of the template is H/2+ f H/2, wherein H is the thickness of the cement-stabilized base layer, and f is the loose paving coefficient of the cement-stabilized base layer.
Further, in the step (8), the construction of the transverse feeding rear cement stabilized base layer is specifically carried out as follows:
8.1 planning construction control time of rear cement stabilized base
The construction control time of the starting point and each point of the rear cement stabilization base layer is controlled to be completed before the delay time of cement after the cement stabilization mixture of the first vehicle and the corresponding vehicle number is added with water, and the construction control time is advanced by 5-10 percent; and all the front and rear layers or multiple layers are maintained to finish the construction before the delay time of the cement;
8.2 spreading and rolling machine in place
According to the planned framing construction sequence, a paver and a rolling machine are in place at the construction frame, namely the starting point of the paved front layer, a transverse feeding device is in place at the other frame, and the loose paving thickness value of the rear layer is adjusted and determined according to the data obtained by the construction of the test road;
8.3 mixing and transporting cement stable mixture
8.4 Cross feed paving
The method comprises the steps of conveying a cement stable mixture to a position in front of another non-paving width of a paving site, retreating the non-paving width to a position in front of a hopper of a transverse feeder, slowly advancing, enabling the hopper of the transverse feeder to be in contact with a rear wheel of a dump truck and pushing the dump truck to advance, unloading the cement stable mixture into the hopper of the transverse feeder by the dump truck according to the paving speed, conveying the cement stable mixture to an asphalt mixture paver of the paving width by the transverse feeder in a transverse conveying belt feeding mode, and paving to form transverse feeding and paving; the speed of the transverse feeder and the speed of the asphalt mixture paver are kept synchronous;
8.5 spreading and Rolling
The system controls the transverse feeding of cement stabilizing material to be paved, and the vibratory roller stabilizes the pressure firstly, then vibrates the pressure and then retracts the wheel track; rolling is carried out from light to heavy, from low to high, and wheel tracks are overlapped, wherein each 15-30 m is a rolling section, and the rolling flatness and compaction quality at the subsection of the rolling section are noticed;
8.6 quality test
And (5) after the construction of the rear cement stabilized base layer is finished, carrying out detection on the leveling speed, the width, the elevation, the longitudinal slope, the transverse slope and the compactness, and detecting the compactness by using a nuclear density meter and matching with a sand filling method.
Further, in the step (9), the cement stabilized base course is cured as follows:
and covering a curing material on the rear cement stabilized base layer which is constructed and qualified in quality detection, wherein the covered curing material is a water adsorption material and a plastic film, and curing is not less than 7 days, or covering and curing after spraying an emulsified asphalt permeable layer on the rear cement stabilized base layer which is qualified in quality detection.
Further, the quality acceptance of the step (10) is also included after the cement-stabilized base course is cured:
and (4) performing quality inspection on the 8 th day after the cement stabilized base course is cured for 7 days, and performing quality inspection and acceptance by inspecting indexes such as the thickness, the integrity, the front and rear layer adhesion, the deflection value, the continuous leveling speed and the like of the cement stabilized base course through the drill core.
Further, the concrete process of asphalt layer construction is as follows:
(1) asphalt permeable layer construction
After the cement stabilization base layer passes the acceptance check, cleaning and dedusting the surface, and spreading an emulsified asphalt permeable layer on the cement stabilization base layer by using an asphalt spreading vehicle;
(2) construction of emulsified asphalt slurry seal or synchronous chip seal
Spreading construction slurry seal or synchronous construction gravel seal on the cement stabilization base layer on which the emulsified asphalt permeable layer is spread, and closely following the pressure stabilization synchronous gravel seal;
(3) spreading asphalt adhesive layer on the broken stone seal
Cleaning and dedusting the constructed gravel seal, and spraying an asphalt adhesive layer by using an asphalt spraying vehicle after removing overlapped loose particles;
(4) construction of lower surface of asphalt mixture
Mixing the lower surface layer asphalt mixture according to the mixing proportion, transporting to a paving site, and controlling the paving asphalt lower surface layer mixture by a system; rolling the lower asphalt surface layer;
(5) spreading asphalt adhesive layer on the lower asphalt surface layer
Cleaning and dedusting a constructed asphalt lower surface layer, and then spraying an asphalt adhesive layer;
(6) surface layer construction in asphalt mixture
Mixing the middle-surface layer asphalt mixture according to the mixing proportion, transporting to a paving site, and controlling the paving of the middle-surface layer asphalt mixture by a system to roll the middle-surface layer asphalt mixture;
(7) spreading asphalt adhesive layer on the middle asphalt surface layer
Cleaning and dedusting a constructed asphalt middle surface layer, and then spraying an asphalt adhesive layer;
(8) construction of upper layer of asphalt mixture
Mixing the upper layer asphalt mixture according to the mixing proportion, transporting to a paving site, paving the upper layer asphalt mixture, and rolling the middle layer asphalt;
(9) spreading asphalt fog sealing layer on the upper asphalt layer
The upper surface layer of the asphalt pavement is newly built and expanded under the environment of rainy, humid and freeze-thaw cycle, and the traffic is opened after the asphalt fog sealing layer is sprayed, so that the porosity is further reduced by the permeability of the asphalt fog sealing layer.
Compared with the prior art, the invention has the following advantages:
the invention applies the 3D digital intelligent paving control system, improves the paving precision of each structural layer of the road pavement to one tenth of a millimeter, automatically controls the paving of each structural layer, does not need to pay off each structural layer manually except improving the paving precision, saves a large amount of labor cost, and is not limited by night.
The invention completes the construction of the cement stabilization base layer with large thickness in cement delay time at one time, strengthens interlayer connection treatment, meets the construction of common compaction equipment, realizes the theory of designing one thick plate of the cement stabilization base layer, and improves the uniformity and the overall quality index of the cement stabilization base layer.
The invention overcomes the requirements that a heavy road roller is necessary for one-time paving, rolling and forming of the large-thickness cement stabilized base layer, and the problems that the surface layer crushed stone is crushed by the surface heavy road roller to decompose particles, the lower part compactness is insufficient, the upper part compactness is overlarge and the whole plate thickness is uneven. Meanwhile, the hidden troubles that the interlayer connection between the layered interval construction layers is not good and the quality of the lower layer is possibly influenced by the rear-layer construction vibratory roller are overcome.
The road cement stable base layer adopts the transverse feeder to feed the asphalt mixture spreader or transversely and automatically feed, so that the super-thick cement stable layer can be constructed and formed at one time, and the defects of the existing cement stable layer construction are overcome.
The method eliminates the disturbance of heavy construction equipment such as a one-time longitudinal overlapping forming dump truck on the constructed lower layer and the influence on the interlayer bonding quality.
The invention builds and reconstructs the upper layer of the asphalt pavement under the environment of rainy, humid and freeze-thaw cycle, and opens the traffic after spreading the asphalt fog sealing layer by the asphalt spreading vehicle, and further reduces the porosity by the permeability of the asphalt fog sealing layer, enhances the water sealing performance of the upper layer of the asphalt, and effectively reduces the water damage of the early diseases of the asphalt pavement; meanwhile, the fog seal layer can also increase the thickness of the asphalt film on the surface of asphalt, supplement the loss of the asphalt film on the surface in the rolling process of the road roller, increase and prolong the skid resistance of the road surface, and effectively prevent the early water damage of the asphalt road surface and prolong the service life of the road surface.
The invention is suitable for the rigid cement concrete pavement engineering which takes the cement stabilizing layer semi-rigid asphalt concrete pavement and the cement stabilizing layer as the subbase layer for the new construction, the reconstruction and the extension of the highway, the municipal road and the airport pavement engineering, and has good social and economic benefits after popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic illustration of a base construction preparation;
FIG. 2 is a diagram of the processing relationship of a front layer and a back layer base layer;
FIG. 3 is a schematic view of lateral automatic feed;
the relationship between the labels and their corresponding structures in the above figures is as follows:
a is a first road shoulder, generally a road shoulder or a cement concrete or a slab cement concrete reinforced road shoulder, B is a second road shoulder, generally a hard road shoulder; h is the thickness of the cement stable base layer, H is the thickness of the base layer, C is the paver, and D is the transverse aggregate conveying equipment.
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. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The construction method for paving the once-formed cement stabilized base layer with the transverse automatic feeding and the high precision has the structure shown in figures 1-3 and comprises the following sequential steps:
step (1), preparation work
1.1 selection 3D (length, width, height three-dimensional) digital intelligent paving control system
According to the characteristics that the road is an expressway, a tunnel exists, fog and rain exist in winter, the climate is humid, and much cloudy days exist, the paving width of the left and right pavements is 10.5 meters each time, the pavement is carried out by a single machine, a medium-large DT2000 type anti-segregation paver is selected for paving the base layer and the cement stabilized base layer, and a Fugeler SUPER2100-2 asphalt paver (the maximum paving width is 13 meters) is used for paving the asphalt surface layer; the milling machine selects a WEITGEN W2100 type (milling width is 2.2 m), the land leveler selects a triple-work SMG200-3 heavy-load land leveler, and the two spreading machines select and install a Leica 3D (length, width and height three-dimensional) digital intelligent paving control system.
1.2 recalculating the design values of the road plane, elevation and width
And (3) recalculating the plane, elevation and width control design values of each structural layer of the road according to the existing design node data of the road, improving the precision of the plane, elevation and width data to one tenth of millimeter precision, and keeping the precision of the 3D digital intelligent paving control of the Leica at one tenth of millimeter high precision.
1.3 restoring or establishing plane and elevation control network system
The plane and elevation control network piles are rearranged according to the design and the existing plane and elevation control piles and data, meanwhile, the middle encryption control pile is considered and is buried, and stability and safety of the control pile are guaranteed.
Combining the existing conditions of a plane and elevation control network, wherein the plane control network adopts a 3-grade GPS + primary wire combined network; and (4) carrying out height measurement by arranging a net according to the three equal leveling measurements.
The plane and elevation control piles are arranged in a coordinated manner and used together, the control piles are preferably arranged within the range of 1.0-15 meters outside the edges of two sides of a route, one plane control pile is preferably arranged within the range of 500-800 meters, measurement is carried out by using a GPS, and the middle part is encrypted; the high-program control piles are preferably arranged one by one in the range of 2-2.5 kilometers, and are encrypted in the middle.
The control pile is suitable to be selected at a position which has a wide, stable and safe visual field, is not close to high and large ground objects and is convenient to observe, and is buried as a permanent fixing pile.
And after the plane and elevation control network is established and observation is finished, calculating and balancing to obtain coordinates and elevation values of each point position.
1.4 retest road bed elevation
After the roadbed construction is finished and the roadbed is subjected to sequence conversion and acceptance, the elevations of the middle piles and the side piles are measured again and calculated according to the recovered plane and elevation control system, the distance between every two straight line segments is 10 meters, the distance between every two curve segments and every two vertical curve segments is 5 meters, and the number of machines of the parallel paver.
1.5 spreading control digital input come card 3D control system
And inputting the design values of the plane, the elevation and the width of each structural layer of the recalculated road and the elevation value of the retest roadbed into the laika 3D digital intelligent paving control system.
1.6 construction of test section of each structural layer
Before formal construction of each structural layer, selecting a representative road section with the paving length of 400m to determine the performance and accuracy of each component paved by the Leica 3D, the loose paving coefficient of the mixture, the traveling speed of the paver, the sequence of compaction equipment, the rolling speed, the pass number, the compaction degree, the mixture mixing control data, the number of the transport machines and the operation control and matching mode between the working machines, and adjusting the Leica 3D control paving data according to the test data.
When the construction machinery or the mixture gradation changes, the construction of the test section should be carried out again.
Step (2) road shoulder construction
As shown in figure 1, the first shoulder A is C20 cement concrete, the second shoulder B is a hard shoulder with the width of 2.5 meters, the structure of the shoulder is consistent with that of a traffic lane, and the shoulder is combined with the traffic lane and simultaneously constructed according to the corresponding structural level of the road surface. If the first road shoulder A is cement concrete or flake cement concrete, the steel formwork is manufactured and installed, the cement concrete is mixed by adopting three HSZ120 mixing stations, a concrete tank truck is transported to the site to be put into a mold to be vibrated and poured, and the maintenance is carried out.
The road shoulder A and the road shoulder B are paved by a grader or a bituminous mixture paver and rolled by a vibratory roller by selecting qualified clay or natural sand gravel and crushed gravel filler with the compaction thickness of each layer not more than 20 cm, and the compaction degree reaches more than 98 percent of the heavy compaction standard. If the second road shoulder B is used as a hard road shoulder, construction is carried out together according to the corresponding structural layer of the road surface; when the first road shoulder A is cement concrete or flake cement concrete, a steel template is manufactured and installed, a cement concrete mixing station mixes the concrete, a concrete tank truck is transported to the site, the concrete is placed into a mold, vibrated and poured, and the concrete is cured.
Step (3), constructing and cleaning the subbase layer
And (3) carrying out subbase construction on a roadbed, when the subbase is graded broken stones, blending the broken stones with various specifications according to the grading requirement, blending the broken stones with a stabilizing soil mixing machine with double mixing cylinders, transporting the mixture to the site by using a sealed special dump truck, carrying out 3D controlled paving by using an asphalt mixture paver or an asphalt mixture paver, and carrying out rolling forming by using a vibratory roller and a rubber-tyred roller. When the subbase layer is natural-grade sand-gravel and crushed gravel, the subbase layer is fully mixed by a loader in a collection field, the water content is ensured, the material is not less than 48 hours, a special sealed dumper is transported to the field, the asphalt mixture paver or the asphalt mixture paver is controlled by 3D to pave, or the grader is controlled by 3D to pave, and the vibratory roller and the rubber-tyred roller are rolled and molded. When the subbase layer is cement or lime stabilized macadam and gravel layer, according to the mixing proportion, mixing by using a double-mixing-cylinder stabilized soil mixing machine, transporting to the site by using a sealed special dump truck, controlling the paving by using an asphalt mixture paver in 3D, and curing after rolling and forming by using a vibratory roller and a rubber-wheel roller.
The construction method is characterized in that the subbase construction is carried out on a road bed, the subbase is graded broken stones and 20 cm thick, the broken stones of various specifications are mixed according to the grading requirement, the mixture is mixed by XC1000 ton/hour double-mixing-cylinder plant mixing equipment, a special sealed dumper is transported to the site, a large DT2000 paver is provided with a Leica 3D digital intelligent control paving machine, and a vibratory roller and a rubber-wheel roller are rolled and molded.
After the construction of the subbase layer is finished, sundries should be cleaned and various quality inspections should be carried out on the subbase layer, so that the quality is ensured to meet the regulations.
Step (4), installing cement stabilized base layer template
And (3) on the central separation belt or the underlayer at the edge position of the inner cement stabilization base layer, using steel nails to be driven into the underlayer and the roadbed filling to serve as fixing pieces of lateral templates of the cement stabilization base layer, and using supporting connecting pieces to install and correct the cement stabilization base layer templates, wherein the height of the templates is H/2+ f H/2(H is the thickness of the cement stabilization base layer, and f is the loose coefficient of the cement stabilization base layer), and the height of the templates is 38/2+1.18 x 19, and the width of the templates is 41.42 cm.
Step (5), sprinkling water on the subbase layer for wetting
The subbase and cement stabilized base course template installation construction are ended, carry out 24 hours before the cement stabilized base course construction, and it is moist evenly to sprinkle water many times on the subbase with the watering lorry to two hours is once again sprinkled before the construction, nevertheless guarantees to cement stabilized base course construction before moist on the subbase, ponding not.
Step (6), construction and quality inspection of cement stabilized base layer of front layer of longitudinal feeding
6.1 planning Framing construction sequence
The road is generally divided into a left road and a right road for construction respectively, and continuous framing and single-machine construction from a starting point to a terminal point are planned according to a construction organization plan, the mixing station position and the general trend condition of a longitudinal slope before construction.
6.2 spreading and Rolling machines in place
According to the planned framing construction sequence, the paving and rolling machine is in place, and the front layer loose paving thickness value is adjusted and determined according to data obtained by the test road construction.
6.3 mixing and transporting of Cement Stable mixture
According to the mixing proportion of the cement stabilizing materials, mixing the cement stabilizing materials by using a slow-release XC1000 ton/h double-mixing-cylinder plant mixing device, and recording the time for mixing the cement by adding water; and the sealed dump truck transports the cement stable mixture to a paving site.
6.4 longitudinal feed spreading
As shown in fig. 3, when the dump truck transports the cement-stabilized mixture to the paving site, a proper place is selected at an interval of about 300 meters for turning around, the paving width retreats to the front of the hopper of the paver in a reverse running mode, the paver is contacted with the rear wheel of the dump truck in a slow forward running mode and pushes the dump truck to move forward, and the dump truck unloads the material into the hopper of the paver according to the paving speed to form longitudinal feeding paving. C is a paver and D is transverse aggregate conveying equipment.
6.5 spreading and Rolling
Using a medium-large DT2000 type paver to install a come card 3D digital intelligent control paving cement stable mixture, and using a vibratory roller to stabilize pressure firstly, then vibrate the pressure and then collect wheel tracks; rolling should be performed in a way that the rolling is light and then heavy, the rolling is performed from low to high in a way that wheel tracks are overlapped, each 10-20 m is a rolling section, and the rolling flatness and compaction quality at the subsection of the rolling section are noticed.
6.6 quality test
The construction quality inspection of the cement stabilized base layer of the front layer is mainly the compactness, and when the rolling times meet the requirements and no obvious wheel tracks exist, the compactness is detected by a nuclear density meter.
Step (7), rough surface construction of the front cement stabilization base layer
After the construction compactness of the cement stabilized base layer at the front layer is detected to be qualified, pressing the surface of the cement stabilized base layer at the front layer by using a land leveler with a triple-work SMG200-3 heavy-duty land leveler scraper knife provided with comb-shaped teeth (the tooth height is 5-10mm, and the tooth pitch is 5-10mm) strips, retreating and galling the surface, and performing rough construction;
step (8), spraying cement slurry
As shown in figure 2, after the surface roughening construction of the cement stabilized base layer of the front layer is finished, cement paste which is made of cement with the same grade as the cement stabilized base layer according to the water cement ratio of 1:0.5-1:1.0 is uniformly sprayed on the cement stabilized layer with the roughened surface, and the spraying area of the cement paste per cubic meter is not more than 140 square meters.
Step (9), construction and quality inspection of transverse feeding rear cement stabilized base layer
9.1 planning construction control time of rear cement stabilized base
The construction control time of the starting point of the rear cement stabilized base layer is controlled to be 5.5 hours (retarder is added into retarded cement or common cement) before the delay time (initial setting time) of the cement is 5.5 hours after the first vehicle cement stabilized mixture is added with water, and the construction control time is advanced by 5-10 percent; and all the front and rear layers (if any) are maintained to finish the construction before the delay time (initial setting time) of the cement.
9.2 spreading and rolling machine in place
According to the planned framing construction sequence, a paver and a rolling machine are in place on a construction frame (the starting point of a paved front layer), a transverse feeding machine is in place on the other frame, and the loose paving thickness value of a rear layer is adjusted and determined according to data obtained by construction of a test road.
9.3 mixing and transporting cement stable mixture
According to the mixing proportion of the cement stabilizing materials, mixing the cement stabilizing materials by using a slow-release XC1000 ton/h double-mixing-cylinder plant mixing device, and recording the time for mixing the cement by adding water; and the sealed dump truck transports the cement stable mixture to a paving site.
9.4 transverse feed spreading
As shown in fig. 3, the dump truck transports the cement-stabilized mixture to the front of another non-paving width on the paving site, selects a proper place for turning around at intervals of 400m, retreats the non-paving width to the front of the hopper of the transverse feeder in a reverse operation mode, enables the hopper of the transverse feeder to contact with the rear wheel of the dump truck in a slow forward mode and pushes the dump truck to move forward, the dump truck unloads the material into the hopper of the transverse feeder according to the paving speed, a large ZYH1000 transfer vehicle is arranged in the transverse feeder, and the transverse feeder transports the cement-stabilized mixture to the asphalt mixture paver of the paving width in a transverse conveyor belt feeding mode to form transverse feeding paving. The speed of the transverse feeder and the speed of the asphalt mixture spreader are kept synchronous.
9.5 spreading and Rolling
Using a medium-large DT2000 type paver to install a come card 3D digital intelligent control paving cement stable mixture, and using a vibratory roller to stabilize pressure firstly, then vibrate the pressure and then collect wheel tracks; rolling should be performed in a way that the rolling is light and then heavy, the rolling is performed from low to high in a way that wheel tracks are overlapped, a rolling section is formed every 15-30 m, and the rolling flatness and compaction degree quality at the subsection of the rolling section are noticed.
9.6 quality test
And (5) after the construction of the rear cement stabilized base layer is finished, carrying out detection on the leveling speed, the width, the elevation, the longitudinal slope, the transverse slope and the compactness, and detecting the compactness by using a nuclear density meter and matching with a sand filling method.
Step (10), cement stabilization base course curing
And covering a curing material on the rear cement stable base layer which is constructed and qualified in quality detection, wherein the covered curing material is a water-absorbing material and a plastic film so as to be beneficial to keeping moisture and temperature, and the curing is carried out for not less than 7 days. Or spraying emulsified asphalt on the rear cement stable base layer which is qualified in quality detection, and then covering and curing.
Step (11), quality acceptance
And (4) performing quality inspection on the 8 th day after the cement stabilized base course is cured for 7 days, and performing quality inspection and acceptance by inspecting indexes such as the thickness, the integrity, the front and rear layer adhesion, the deflection value, the continuous leveling speed and the like of the cement stabilized base course through the drill core.
Step (12), asphalt layer construction
12.1 asphalt through-layer construction
After the cement stabilized base layer passes through acceptance inspection, the surface is cleaned and dedusted, and an emulsified asphalt permeable layer is sprayed on the cement stabilized base layer by an asphalt spraying vehicle.
12.2 construction of emulsified asphalt slurry seal or synchronous chip seal
On the cement stabilized base layer of the sprayed emulsified asphalt permeable layer, a slurry seal vehicle is used for spraying construction slurry seal or a synchronous gravel seal vehicle is used for synchronous construction gravel seal, and a rubber-tyred road roller is closely followed by a pressure-stabilizing synchronous gravel seal.
12.3 spreading asphalt adhesive layer on the chip seal
Cleaning and dedusting the constructed broken stone seal, removing overlapped loose particles, and spraying an asphalt adhesive layer by using an asphalt spraying vehicle.
12.4 lower layer construction of asphalt mixture
Mixing a lower asphalt mixture according to a mixing ratio by using a Marangoni MAT440(5500 type) asphalt mixing plant, transporting the mixture to a paving site by using a special heat-preservation dumper, paving the lower asphalt mixture by using a 3D digital intelligent control system installed on a Forgeller SUPER2100-2 asphalt paver, and rolling the lower asphalt layer by matching a rubber-tyred road roller with a double-steel-wheeled vibratory road roller.
12.5 spreading asphalt adhesive layer on the lower surface layer of asphalt
Cleaning and dedusting the lower surface layer of the constructed asphalt, and then spraying an asphalt bonding layer by using an asphalt spraying vehicle.
12.6 asphalt mixture middle surface layer construction
Mixing the middle-surface layer asphalt mixture according to a mixing ratio by using a Marangoni MAT440(5500 type) asphalt mixing plant, transporting the special heat-preservation dumper to a paving site, installing a 3D digital intelligent control system by using a Forgeller SUPER2100-2 asphalt paver to pave the asphalt middle-surface layer mixture, and matching a rubber-tyred road roller with a double-steel-wheel vibratory road roller to roll the asphalt middle-surface layer.
12.7 spreading asphalt adhesive layer on the middle asphalt surface layer
Cleaning and dedusting the constructed asphalt middle surface layer, and then spraying an asphalt bonding layer by an asphalt spraying vehicle.
12.8 construction of upper layer of asphalt mixture
And (3) mixing the upper asphalt mixture according to a mixing ratio by using a Marangoni MAT440(5500 type) asphalt mixing plant, transporting the mixture to a paving site by using a special heat-preservation dumper, paving the upper asphalt mixture by using a Forgler SUPER2100-2 asphalt paver and installing a 3D digital intelligent control system, and rolling the upper asphalt layer by using a double-steel-wheel vibratory roller.
12.9 spreading asphalt fog seal layer on the upper layer of asphalt
Newly building and reconstructing an upper layer of the asphalt pavement under the rainy, humid and freeze-thaw cycle environment, spreading an asphalt fog sealing layer by using an asphalt spreading vehicle, then opening traffic, further reducing the porosity by using the permeability of the asphalt fog sealing layer, enhancing the water sealing performance of the upper layer of the asphalt, and effectively reducing the water damage of early diseases of the asphalt pavement; meanwhile, the fog seal layer can also increase the thickness of the asphalt film on the surface of the asphalt, supplement the loss of the asphalt film on the surface in the rolling process of the road roller and increase and prolong the skid resistance of the road surface.
The upper layer of the asphalt mixture of the embodiment is constructed and qualified by quality detection, and is sprayed by an asphalt spraying vehicle with the weight of 0.3-0.6kg/m2The prime coat emulsified asphalt.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A construction method of a transverse automatic feeding base layer is characterized in that: the method selects a digital intelligent paving control system, recalculates the control design values of the plane, the elevation and the width of each structural layer of the road according to the existing design node data of the road, and improves the precision of the plane, the elevation and the width data to one tenth of millimeter; providing or existing plane and elevation control piles and data according to design, rearranging the plane and elevation control net piles, simultaneously considering middle encryption control piles, and embedding; restoring or reestablishing a high-precision plane and elevation control network by combining the grades of the existing plane and elevation control network, and calculating and balancing; after the roadbed construction is finished, the elevation of the middle pile, the side piles and the middle control pile is measured again and calculated; inputting the recalculated design values of the plane, the elevation and the width of each structural layer of the road and the elevation values of the retest road bed into a digital intelligent paving control system; then, carrying out test section construction of each structural layer; when the construction machinery or the mixture gradation changes, the construction of the test section is carried out again;
the method comprises the following steps:
step (1), road shoulder construction
The first shoulder and the second shoulder at the two ends of the route are rolled with the compaction thickness of each layer not more than 20 cm, and the compaction degree reaches more than 98% of the heavy compaction standard;
step (2), constructing and cleaning the subbase layer
Carrying out subbase construction on a road bed, and when the subbase is graded broken stones, blending, paving and rolling the crushed stones of various specifications according to the grading requirement;
step (3) installing cement stabilized base layer template
On the central separation zone or the subbase layer at the edge position of the inner side cement stabilization base layer, the fixing piece of the lateral template of the cement stabilization base layer is driven into the subbase layer and the road bed filling soil to support the installation of the connecting piece and correct the template of the cement stabilization base layer;
wetting the underlayer
After the installation construction of the subbase layer and the cement stabilization base layer template is finished, uniformly sprinkling water on the subbase layer for multiple times for wetting;
step (5), construction of cement stabilized base course of front layer of longitudinal feeding
According to the planned framing construction sequence, the paving and rolling machine is in place, and the front layer loose paving thickness value is adjusted and determined according to data obtained by test road construction; batching according to the mixing proportion of the cement stabilizing material, and then carrying out longitudinal feeding and paving:
when the cement stable mixture is transported to a paving site, the paving amplitude retreats to the front of a hopper of the paver, the paver is contacted with the rear wheel of the dump truck in a slow forward mode and pushes the dump truck to move forward, and the dump truck unloads the material into the hopper of the paver according to the paving speed to form longitudinal feeding and paving;
the system controls the cement stabilizing material to be spread, and the vibratory roller stabilizes the pressure firstly, then vibrates the pressure and then retracts the wheel track; rolling from low to high with overlapping wheel tracks, wherein each 10-20 m is a rolling section, and the rolling flatness and compaction quality at the sectional position of the rolling section are noticed;
step (6), rough surface construction of the front cement stabilization base layer
After the construction compactness of the front cement stabilized base layer is detected to be qualified, pressing the front cement stabilized base layer on the surface by using a land leveler with a comb-shaped rack arranged below a shovel blade, retreating and napping the surface, and performing rough construction; the tooth height of the comb-shaped rack is 5-10mm, and the tooth pitch is 5-10 mm;
step (7), spraying cement slurry
The rough construction of front cement stabilized base course surface is ended, and the cement with the same grade as the cement stabilized base course is used according to the water cement ratio of 1:0.5-1:1.0, spraying the cement paste on the cement stable base layer with the rough surface;
step (8), transversely feeding and constructing a rear cement stabilized base layer
The method specifically comprises the following steps:
8.1 planning construction control time of rear cement stabilized base
The construction control time of the starting point and each point of the rear cement stabilization base layer is controlled to be completed before the delay time of cement after the cement stabilization mixture of the first vehicle and the corresponding vehicle number is added with water, and the construction control time is advanced by 5-10 percent; and all the front and rear layers or multiple layers are maintained to finish the construction before the delay time of the cement;
8.2 spreading and rolling machine in place
According to the planned framing construction sequence, a paver and a rolling machine are in place at the construction frame, namely the starting point of the paved front layer, a transverse feeding device is in place at the other frame, and the loose paving thickness value of the rear layer is adjusted and determined according to the data obtained by the construction of the test road;
8.3 mixing and transporting cement stable mixture
8.4 Cross feed paving
The method comprises the steps of conveying a cement stable mixture to a position in front of another non-paving width of a paving site, retreating the non-paving width to a position in front of a hopper of a transverse feeder, slowly advancing, enabling the hopper of the transverse feeder to be in contact with a rear wheel of a dump truck and pushing the dump truck to advance, unloading the cement stable mixture into the hopper of the transverse feeder by the dump truck according to the paving speed, conveying the cement stable mixture to an asphalt mixture paver of the paving width by the transverse feeder in a transverse conveying belt feeding mode, and paving to form transverse feeding and paving; the speed of the transverse feeder and the speed of the asphalt mixture paver are kept synchronous;
8.5 spreading and Rolling
The system controls the transverse feeding of cement stabilizing material to be paved, and the vibratory roller stabilizes the pressure firstly, then vibrates the pressure and then retracts the wheel track; rolling is carried out from light to heavy, from low to high, and wheel tracks are overlapped, wherein each 15-30 m is a rolling section, and the rolling flatness and compaction quality at the subsection of the rolling section are noticed;
8.6 quality test
After the construction of the rear cement stabilized base layer is finished, carrying out detection on the leveling speed, the width, the elevation, the longitudinal slope, the transverse slope and the compaction degree, and detecting the compaction degree by using a nucleon densimeter in combination with a sand filling method;
step (9), curing the cement stabilized base layer;
step (10), constructing an asphalt layer;
the thickness of the base layer exceeds 20 cm, and the concrete process of asphalt layer construction is as follows:
(1) asphalt permeable layer construction
After the cement stabilization base layer passes the acceptance check, cleaning and dedusting the surface, and spreading an emulsified asphalt permeable layer on the cement stabilization base layer by using an asphalt spreading vehicle;
(2) construction of emulsified asphalt slurry seal or synchronous chip seal
Spreading construction slurry seal or synchronous construction gravel seal on the cement stabilization base layer on which the emulsified asphalt permeable layer is spread, and closely following the pressure stabilization synchronous gravel seal;
(3) spreading asphalt adhesive layer on the broken stone seal
Cleaning and dedusting the constructed gravel seal, and spraying an asphalt adhesive layer by using an asphalt spraying vehicle after removing overlapped loose particles;
(4) construction of lower surface of asphalt mixture
Mixing the lower surface layer asphalt mixture according to the mixing proportion, transporting to a paving site, and controlling the paving asphalt lower surface layer mixture by a system; rolling the lower asphalt surface layer;
(5) spreading asphalt adhesive layer on the lower asphalt surface layer
Cleaning and dedusting a constructed asphalt lower surface layer, and then spraying an asphalt adhesive layer;
(6) surface layer construction in asphalt mixture
Mixing the middle-surface layer asphalt mixture according to the mixing proportion, transporting to a paving site, and controlling the paving of the middle-surface layer asphalt mixture by a system to roll the middle-surface layer asphalt mixture;
(7) spreading asphalt adhesive layer on the middle asphalt surface layer
Cleaning and dedusting a constructed asphalt middle surface layer, and then spraying an asphalt adhesive layer;
(8) construction of upper layer of asphalt mixture
Mixing the upper layer asphalt mixture according to the mixing proportion, transporting to a paving site, paving the upper layer asphalt mixture, and rolling the middle layer asphalt;
(9) spreading asphalt fog sealing layer on the upper asphalt layer
The upper surface layer of the asphalt pavement is newly built and expanded under the environment of rainy, humid and freeze-thaw cycle, and the traffic is opened after the asphalt fog sealing layer is sprayed, so that the porosity is further reduced by the permeability of the asphalt fog sealing layer.
2. The lateral automatic feed substrate construction method of claim 1, wherein: in the step (3), the height of the template is H/2+ f H/2, wherein H is the thickness of the cement stabilized base layer, and f is the loose paving coefficient of the cement stabilized base layer.
3. The lateral automatic feed substrate construction method of claim 1, wherein: in the step (9), the cement stabilized base course is cured as follows:
and covering a curing material on the rear cement stabilized base layer which is constructed and qualified in quality detection, wherein the covered curing material is a water adsorption material and a plastic film, and curing is not less than 7 days, or covering and curing after spraying an emulsified asphalt permeable layer on the rear cement stabilized base layer which is qualified in quality detection.
4. The lateral automatic feed substrate construction method of claim 1, wherein: the method also comprises the following steps (11) of quality acceptance after the cement stabilized base course is cured:
and (4) performing quality inspection on the 8 th day after the cement stabilized base course is cured for 7 days, and performing quality inspection and acceptance by inspecting indexes such as the thickness, the integrity, the front and rear layer adhesion, the deflection value, the continuous leveling speed and the like of the cement stabilized base course through the drill core.
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| CN102704378B (en) * | 2012-05-24 | 2015-04-22 | 三一重工股份有限公司 | Spreading machine, and method and device for controlling material level of spreading machine |
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