CN111021174A - Construction method of urban road - Google Patents
Construction method of urban road Download PDFInfo
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- CN111021174A CN111021174A CN201911295594.2A CN201911295594A CN111021174A CN 111021174 A CN111021174 A CN 111021174A CN 201911295594 A CN201911295594 A CN 201911295594A CN 111021174 A CN111021174 A CN 111021174A
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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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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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
- E01C19/185—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect for both depositing and spreading-out or striking-off the deposited mixture
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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
- E01C19/52—Apparatus for laying individual preformed surfacing elements, e.g. kerbstones
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a construction method of urban road, it includes constructing the soil road bed at first, tamp the road bed of the road, thus build the solid foundation for the construction of the road; then, the cement lime soil base layer is constructed, so that the influence of the rise and fall of the underground water level on the road is reduced; then, the cement stabilized macadam base is constructed, the cement stabilized macadam base can evenly diffuse the vehicle load borne by the road surface to the roadbed, and meanwhile, the cement stabilized macadam base has good drainage performance and can reduce water accumulated in the roadbed, so that the bearing capacity of the road is improved; then, the construction is carried out on the asphalt concrete pavement, and the asphalt concrete pavement has better smoothness after the construction is finished, so the driving is stable and comfortable, and the noise is low; finally, the installation of the side flat stones provides drainage for the sidewalk and the road surface, protects the edge of the road surface and separates the sidewalk from the roadway, thereby ensuring the safety of pedestrians. The invention has the effects of improving the construction method and prolonging the service life of the road.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a construction method of an urban road.
Background
The urban road is a road for traffic of vehicles and pedestrians necessary for organizing production and arranging life in the city, and is a traffic link which connects all components of the city and is communicated with suburban roads. Meanwhile, the urban road is also a foundation for forming urban transportation, is a foundation for arranging urban public utilities on the ground and underground pipeline facilities, greening streets, organizing buildings along the streets and dividing streets, provides a containing space for urban shared facilities, and is an important component of urban municipal facilities.
At present, the road construction process adopted by the prior art is as follows: temporary sidewalks, surface cleaning and dredging, roadbed earth and stone filling, drainage construction branch drain pipe construction, pipeline construction, base layer and pavement; when the pavement is constructed, the well-stirred concrete is directly poured out, then trowelling treatment is carried out, and finally the vehicle can be opened after being dried.
The above prior art solutions have the following drawbacks: when the prior art is used for construction, the whole construction steps are simplified, the road is not specially treated, and the concrete has the characteristics of expansion with heat and contraction with cold, so that the road pavement made by the prior art is easy to crack, the service life is influenced, and the improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the construction method of the urban road, which has the advantages of perfecting the construction method and prolonging the service life of the road.
The above object of the present invention is achieved by the following technical solutions:
a construction method of an urban road comprises the following steps:
s100, performing temporary drainage work on the original ground before roadbed construction; before roadbed filling, removing ploughing and planting soil or surface sludge, digging and mixing ash, and rolling; splicing the junctions of the multiple sections of roadbed; compacting in sequence, and regularly checking the water content of the soil; filling and compacting 30cm of ultra wide soil on each side of the whole construction section;
s200, constructing a cement lime soil base layer, rolling by using a road roller and inspecting the soil base; preparing cement lime soil, wherein the cement lime soil construction adopts a stabilized soil mixer to perform road mixing method construction, soil and lime are uniformly spread on a roadbed according to a layer paving method according to a predetermined loose paving coefficient for a cement lime soil base layer with the thickness of 20cm, a smooth wheel road press is used for rolling for 1-2 times respectively, the stabilized soil mixer is adopted, the mixing depth is up to the bottom of a stabilized layer, watering mixing is performed, the water content and the mixing depth are checked, and then a grader is used for shaping and rolling; after the paving and rolling are finished, health preserving and traffic management are carried out;
s300, constructing a cement stabilized macadam foundation, and performing raw material inspection, equipment debugging and technical preparation before construction; adopting a paving scheme of centralized plant mixing, automobile transportation, on-site check, layered paving and total amount control; the construction adopts the schemes of road paving, cross operation, full-width rolling and half-width alignment; preparing a lower bearing layer; measuring and lofting; mixing the cement stabilized macadam mixture; detecting the mixture; transporting the cement stabilized macadam mixture; paving a cement stabilized macadam mixture; performing seam treatment; rolling the cement stabilized macadam mixture; carrying out health maintenance operation on the cement stabilized macadam base;
s400, constructing an asphalt concrete pavement, fully cleaning a lower layer which is paved for a long time before paving asphalt concrete, extracting test samples from all material sources, performing tests on all indexes of raw materials, and then preparing a mixture in a trial mode; stirring the asphalt mixture; transporting the asphalt mixture; paving an asphalt mixture; compacting and molding the asphalt mixture; treating construction joints;
and S500, mounting the side flat stone.
By adopting the technical scheme, the road is orderly processed layer by layer through the construction sequence from bottom to top; firstly, constructing a soil roadbed, and tamping the roadbed of the road, thereby building a solid foundation for the construction of the road; then, constructing the cement lime soil base layer, further tamping the lower layer of the road, and reducing the influence of the rise and fall of the underground water level on the road; then, the cement stabilized macadam base is constructed, the cement stabilized macadam base can evenly diffuse the vehicle load borne by the road surface to the roadbed, and meanwhile, the cement stabilized macadam base has good drainage performance and can reduce water accumulated in the roadbed, so that the bearing capacity of the road is improved; then, the construction is carried out on the asphalt concrete pavement, and the asphalt concrete pavement has better smoothness after the construction is finished, so the driving is stable and comfortable, and the noise is low; finally, the installation of the side flat stones provides drainage for the sidewalk and the road surface, protects the edge of the road surface and separates the sidewalk from the roadway, thereby ensuring the safety of pedestrians; therefore, the construction method is more perfect, and meanwhile, the overall strength of the road is enhanced by the multi-layer structure, so that the service life of the road is prolonged.
Further, the following steps are added in the step S100: and S110, excavating and removing surface impurity and filling soil by 25cm in the road range, clearing and transporting garbage, and leveling the field.
By adopting the technical scheme, the miscellaneous filling soil and the garbage on the surface layer of the soil base layer are removed, so that the reduction of the compactness of the soil base layer caused by excessive garbage on the soil base layer is avoided, the strength of the soil base layer is effectively improved, and the service life of a road is further prolonged.
Further, in step S300, the seam processing is processing of longitudinal seams and transverse seams; when longitudinal joint treatment is carried out, the road section is divided into a plurality of independent operation sections, and coarse aggregates at joints in the independent operation sections are independently treated; the transverse seam processing is that the joint surface is processed after the paving is finished on the same day and the next day, and after a period of time.
By adopting the technical scheme, the longitudinal seams and the transverse seams are separately processed, so that the longitudinal seams and the transverse seams can be spliced orderly; meanwhile, constructors can be concentrated on the treatment of longitudinal seams or transverse seams, and therefore work efficiency is improved.
Further, the method for processing the joint surface by the transverse seam processing comprises the steps of stopping construction until the position 5m away from the tail end of the operation section on the same day, raking the mixed material of the section to be mixed with new materials by workers before construction on the next day, and rolling the mixture with a new paving section after leveling.
Through adopting above-mentioned technical scheme, constructor can splice the next day through mixing new material in the operation section tail end of reserving 5m the previous day, because the highway section of reserving is not processed, consequently this section is comparatively soft to make things convenient for constructor to its stirring, consequently improved the concatenation efficiency when transversal joint is handled.
Further, in the step S300, a three-wheel road roller is used for compacting the lower layer; and compacting the surface layer by adopting a pneumatic tyre roller.
By adopting the technical scheme, the three-wheel road roller and the tire road roller can increase the compactness of the surface of the cement stabilized macadam mixture, so that the cement stabilized macadam mixture can achieve the compact and smooth effect, and the flatness of the top surface of the cement stabilized macadam mixture meets the requirement.
Further, the three-wheel road roller and the tyre road roller repeatedly roll for 3 times.
Through adopting above-mentioned technical scheme, roll 3 times repeatedly, can further increase the compactness on cement stabilized macadam mixture surface through rolling many times to the holistic intensity of road has further been improved.
Further, in the step S400, when the asphalt mixture is mixed, the heating temperature of the asphalt and the aggregate and the delivery temperature of the asphalt mixture are grasped, the aggregate temperature is 10 to 20 degrees higher than that of the asphalt, the temperature of the hot mixed material product is reduced by no more than 5 degrees after the hot mixed material product is stored in the storage bin, and the storage time of the storage bin is no more than 48 hours; the control room of the mixing plant prints the asphalt, the consumption of various mineral aggregates and the mixing temperature disc by disc, and regularly checks the metering and temperature measurement of the mixing plant; the mixing time is determined by trial mixing, and all aggregate particles are completely wrapped by the asphalt mixture; checking the uniformity of the mixture and analyzing abnormal phenomena in time; asphalt samples were tested and analyzed daily.
By adopting the technical scheme, the asphalt mixture can be mixed in strict environmental requirements, so that the quality of the mixed asphalt concrete can be improved, the integral strength of the asphalt concrete pavement after construction is improved, and the service life of the invention is further prolonged.
Further, the test method adopted for the asphalt mixture is a Marshall test.
By adopting the technical scheme, the Marshall test can determine indexes such as stability, flow value and the like of the asphalt mixture by pressing a standard compacted test piece under the conditions of specified temperature, humidity and the like, respectively draw a relation curve of the asphalt-stone ratio and the stability, the flow value, the density, the void ratio and the saturation after a series of calculations, and finally determine the optimal asphalt-stone ratio of the asphalt mixture, thereby further improving the quality of the asphalt mixture.
Further, in the step S400, when the compacting and molding operation is performed on the asphalt mixture, the preliminary pressing is performed at a high temperature after the asphalt mixture is spread.
By adopting the technical scheme, the asphalt mixture at high temperature is softer and can be deformed, so that the compactness and the flatness of the asphalt mixture are improved.
Further, in the step S500, lofting is performed by using a theodolite, elevations of the curbstone and the flat stone are measured by a leveling instrument, one elevation pile is placed at a certain distance, and the piles are leveled by using lines; and (5) vibrating by adopting vibrating equipment during pouring, and manually plastering.
By adopting the technical scheme, the side flat stones can be laid according to the pulled lines when being installed, so that the installation uniformity of the side flat stones is improved; meanwhile, the flatness of the surface of the poured part can be improved by adopting vibration equipment, so that the integral attractiveness of the invention is improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the road is orderly processed layer by layer through the construction sequence from bottom to top; firstly, constructing a soil roadbed, and tamping the roadbed of the road, thereby building a solid foundation for the construction of the road; then, constructing the cement lime soil base layer, further tamping the lower layer of the road, and reducing the influence of the rise and fall of the underground water level on the road; then, the cement stabilized macadam base is constructed, the cement stabilized macadam base can evenly diffuse the vehicle load borne by the road surface to the roadbed, and meanwhile, the cement stabilized macadam base has good drainage performance and can reduce water accumulated in the roadbed, so that the bearing capacity of the road is improved; then, the construction is carried out on the asphalt concrete pavement, and the asphalt concrete pavement has better smoothness after the construction is finished, so the driving is stable and comfortable, and the noise is low; finally, the installation of the side flat stones provides drainage for the sidewalk and the road surface, protects the edge of the road surface and separates the sidewalk from the roadway, thereby ensuring the safety of pedestrians; therefore, the construction method is more perfect, and meanwhile, the overall strength of the road is enhanced by the multi-layer structure, so that the service life of the road is prolonged.
2. The miscellaneous fill and the rubbish on soil base layer surface layer have been clear away to avoided soil base layer to cause the reduction of soil base layer compactness because of rubbish is too much, consequently effectively improved soil base layer's intensity, thereby further prolonged the life of road.
3. The Marshall test can determine the indexes of the asphalt mixture such as stability, flow value and the like by pressing a standard compacted test piece under the conditions of specified temperature, humidity and the like, respectively draw a relation curve of the asphalt-stone ratio and the stability, the flow value, the density, the void ratio and the saturation after a series of calculations, and finally determine the optimal asphalt-stone ratio of the asphalt mixture, thereby further improving the quality of the asphalt mixture.
Drawings
FIG. 1 is a construction flow chart of a construction method for embodying an urban road in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the construction method of an urban road disclosed by the invention comprises the following construction steps:
s100, constructing the soil roadbed. And before roadbed construction, performing temporary drainage work on the original ground. And (5) excavating temporary drainage ditches on two sides of the roadbed to reduce the underground water level. When the roadbed is newly built, before filling, removing plowing soil or surface sludge, in the embodiment, excavating and removing surface impurity filling soil for 25cm in the road range, and cleaning and transporting garbage and leveling the field; digging, mixing with ash and rolling to improve the strength of the roadbed; and (5) filling the roadbed after the rolling is stable.
When the roadbed is filled, the roadbed is divided into a plurality of independent operation areas, and when two sections of junctions are not filled at the same time, the roadbed is filled according to the proportion of 1: 1, layering at a gradient and reserving steps; when two sections are filled simultaneously, a mode of overlapping and connecting the two sections in a layered mode is adopted, and the front section and the rear section are longitudinally overlapped by 1.0-1.5 m.
According to the sequence of completion of all sections of the roadbed, a road roller is used for compacting, and the road roller in the embodiment is a tire road roller. And (5) while compacting, regularly checking the water content of the roadbed to ensure the compactness of the roadbed. And then, filling and compacting soil at the ultra-wide 30cm of each side of the whole construction section to ensure the strength and the compactness of the edge of the roadbed.
S200, constructing a cement lime soil base layer. And rolling and inspecting the cement lime soil base by using a road roller, wherein a three-wheel road roller of 12-15 tons is selected in the embodiment, and rolling is repeatedly performed for 3 times. In the rolling process, when the cement lime soil base is over-dried, proper water spraying is needed; when the cement limestone soil base is too wet, excavation and airing, soil replacement, lime or aggregate doping are adopted for processing, so as to reduce the water content of the cement limestone soil base. Lime in this embodiment is selected to be sufficiently digested in a week period and to maintain a certain humidity, so as to avoid flying of lime in a construction line yard.
The cement lime soil is prepared, and the cement lime soil construction adopts a stabilized soil mixer to carry out road mixing method construction, wherein the road mixing method is that constructors use mechanical equipment or manpower to mix adopted mixed materials on a road according to the road line which is constructed strictly according to the required regulation. For a 20cm thick cement lime soil base layer, soil and lime are uniformly paved on a roadbed according to a predetermined loose paving coefficient by a paving method, wherein the loose paving coefficient is the ratio of the loose paving thickness of the material to the specified compacted thickness, and the loose paving coefficient is 1.20 in the embodiment. And then, rolling the mixture for 1-2 times by using a smooth wheel road roller, using a stabilized soil mixer, and controlling the mixing depth to know the bottom of the stabilized layer, thereby avoiding the part of the cement lime soil base layer containing unmixed cement lime. Then watering and mixing are carried out, the water content and the mixing depth are monitored simultaneously, then a grader is used for shaping and rolling, and the leveling of the joint position is ensured during shaping. In this embodiment, the rolling equipment is a smooth-wheel roller with a width of 12 tons or more, and when rolling the straight line segment, the straight line segment should be rolled from two sides to the center of the road, and the rear wheels are overlapped 1/2 wheel widths.
After the paving and rolling are finished, the cement lime soil base layer needs to be maintained and traffic managed, and in the embodiment, water spraying maintenance is selected and used for 7 days.
S300, constructing the cement stabilized macadam foundation. And raw material inspection, equipment debugging and technical preparation are carried out before construction. The cement stabilized macadam is prepared from cement and macadam as raw materials; in the step, the equipment to be debugged is a stabilized aggregate mixing station, a cement stabilized macadam paver, a road roller, a loader, a material transporting dump truck and a sprinkler; the work needing technical preparation is the paving of a test road section, namely rechecking the construction mix proportion; checking the applicability of the construction scheme, the construction process and the operation procedure; determining the loose paving coefficient of the cement stabilized macadam paved by adopting a paver; discussing the performance of the paver for paving the cement stabilized macadam base; detecting the performance and productivity of mixing equipment; a control method of elevation and thickness when the paver paves cement stabilized macadam; a control method for the optimal water content of the cement stabilized macadam mixture in construction; selecting and combining compacting machines, and carrying out rolling sequence, rolling speed and rolling pass; discussing a method for mutually coordinating and matching construction machines in three procedures of material conveying, paving and rolling; discussing the treatment method of the cement stabilized macadam foundation seam.
The paving scheme adopts centralized plant mixing, automobile transportation, on-site check, layered paving and total amount control. The cement stabilized macadam base course is paved in two layers by a paver, and is leveled by adopting a reference steel wire. In order to obtain more standard technical data, the cement stabilized macadam mixture in the test section adopts a total amount control method, namely, the total weight of the cement stabilized macadam mixture needed in the test section is calculated firstly, the cement stabilized macadam is weighed vehicle by vehicle after being loaded in a mixing field, and the net weight of the materials of each vehicle is weighed. And calculating the total weight of the mixture according to the actual water content measured on site, converting the total weight into the weight of the mixture in the state of the optimal water content, and determining the length of the mixture to be paved on each vehicle according to the compaction degree and the paving thickness of 98 percent until the total weight is enough.
The construction scheme adopts the steps of road-dividing paving, cross operation, full-width rolling and half-width alignment. The overlapping width of the longitudinal seam is 5-10 cm, and the longitudinal seam positions of the upper layer and the lower layer are staggered by 50-60 cm. On the road section of the foundation layer, a part of road shoulder is preferably filled in advance and is properly tamped, so that cement-stabilized macadam mixture can be saved; and on the other hand, the roller compaction is facilitated.
Preparation is made for the lower bearing layer. For the top surface of the cement lime soil subbase layer, the floating soil, loose layer and other impurities on the surface should be cleaned, and the hard surface of the cement lime soil is exposed. For the top surface of the lower layer of cement stabilized macadam, loose aggregates on the surface should be removed, the mud lumps and pollutants on the surface should be removed, and the aggregates should be exposed. Before the upper layer is spread, the surface of the sinking layer should be properly sprinkled with water to be soaked so as to enhance the combination of the upper layer and the lower layer.
And (6) measuring and lofting. Firstly, the central line and the base sideline of the road are discharged, the monitoring section and the position of an observation point are selected, and then the leveling is carried out by adopting a reference steel wire method.
When the cement stabilized macadam mixture is mixed, the water content of the raw materials is measured once every morning and afternoon, and the feeding quantity of the raw materials is adjusted, so that the water content in the mixture is slightly larger than the optimal water content by 2 percent.
When the mixture is detected, the mixing uniformity of the cement stabilized macadam mixture is often visually observed, so that the mixture leaving the factory has uniform color and luster, and is free from segregation and agglomeration; the tester should mainly detect the secondary composition, the cement dosage and the water content of the cement stabilized macadam mixture, and the detection frequency is that each mixing device is used once in the morning and afternoon.
When the cement stabilized macadam mixture is transported, the mixed cement stabilized macadam mixture is loaded by a loader after the storage yard is sealed for 24 hours, and the mixed cement stabilized macadam mixture is loaded and loaded again after being turned and mixed for 2-3 times according to the condition of the mixture, so that segregation is prevented; when the unloading dump truck unloads, the collision of the paver is strictly prohibited, and the mixture is prevented from being unloaded onto the front layer of the paver.
Paving cement stabilized macadam mixture. Before paving, cutting the formed cement-stabilized macadam base layer at the joint into a vertical surface, or raking loose the cement-stabilized macadam mixed material at the joint, and discharging under the command of a specially-assigned person; after the paver is in place, the ironing plate is well adjusted according to the virtual paving thickness at the position of the starting pile number, wood blocks with the same thickness as the virtual paving thickness are laid under the ironing plate, the ironing plate is well adjusted according to the 2% cross slope, and the automatic leveling system enters a working state; when the paver is used for paving, the height of the cement stabilized macadam mixture in the feed chute is higher than the middle shaft of the spiral distributor, so that the phenomenon of material shortage on two sides is avoided; in the embodiment, the upper layer is paved by 4-5 m/min; the cement stabilized macadam mixture is transported by a large-scale dump truck so as to be distributed uniformly, thereby improving the paving quality; when the upper layer is paved, the continuous paving in one operation section is controlled; after half-width flattening, rolling was carried out together over the full width.
And (6) seam processing. The longitudinal seams are required to be 1-2 hours after one operation section is paved, the overlapping width of the longitudinal seams is 5-10 cm, the longest overlapping part is about 2 hours, special treatment is not needed, only 2 people follow the paver, coarse aggregates at the seams are treated, and after proper scarification and leveling are carried out as necessary, the coarse aggregates are rolled together in the full width; after the transverse seams are paved every day to the beginning of the next day, the interval is about 12 hours, the connecting surface is properly treated, and the method is that the compaction is not carried out within the range of about 5m of the tail end of the operation section on the first day; and (4) raking the mixed material of the section and mixing with new materials by workers before construction on the next day, and rolling with a new paving section after leveling. If the interval time is long, the parts of the tail end which are paved last time and have unsatisfactory elevation and flatness are dug, the contact surface is dug into a vertical surface, and then the parts are paved forwards.
When the cement stabilized macadam mixture is rolled, a three-wheel road roller of 18-21 tons is used for rolling the lower layer for 3 times so as to increase the static pressure twice. In order to make the flatness of the top surface meet the requirement, a 16-ton tyre roller can be adopted for rolling for 3 times so as to increase the compactness of the surface mixture and achieve the effect of compacting and leveling.
And carrying out health maintenance operation on the cement stabilized macadam base. In the embodiment, the gunny bag is covered on the surface of the rolled cement-stabilized macadam base layer, and water is sprayed for many times every day, so that the surface of the cement-stabilized macadam is kept in a wet state.
S400, constructing the asphalt concrete pavement. Completely cleaning the lower layer which is paved for a long time originally; before construction, test samples are respectively extracted from all material sources, and raw material index tests are carried out, so that the indexes of the aggregate, such as strength, gradation, grinding value and the like, and the adhesion force and the like of asphalt meet the specified standards, the aggregate is clean, dry, weatherproof and impurity-free in appearance, the fine aggregate is required to have hard and good natural gradation, no weathering and impurity, and the mud content is required to be not more than 1%.
When the asphalt mixture is mixed, the heating temperature of asphalt and aggregate and the delivery temperature of the asphalt mixture are strictly controlled, the aggregate temperature is 10-20 ℃ higher than that of the asphalt, the temperature of a hot mixed material finished product is reduced by no more than 5 ℃ after the hot mixed material finished product is stored in a storage bin, and the storage time of the storage bin is no more than 48 hours; the control room of the mixing plant prints the asphalt, the consumption of various mineral aggregates and the mixing temperature disc by disc, and regularly checks the metering and temperature measurement of the mixing plant; the mixing time is determined by trial mixing, and all aggregate particles are completely wrapped by the asphalt mixture; the uniformity of the mixture is inspected by visual inspection, and abnormal phenomena are analyzed in time; each mixer takes a group of mixture samples to perform Marshall test and extraction screening test every morning and afternoon, and the oil-stone ratio, the mineral aggregate gradation and the physical and mechanical properties of the asphalt concrete are tested; and analyzing the detection result once every week, calculating the oil-stone ratio, the throughput of each level of mineral aggregate and the standard deviation and the variation coefficient of the detection result of the physical and mechanical indexes of the asphalt concrete, and checking whether the production is normal or not.
When transporting the asphalt mixture, a digital display plug-in thermocouple thermometer is adopted to detect the delivery temperature and the delivery site temperature of the asphalt mixture. The insertion depth is more than 150 mm. A special detection hole is formed in the middle of the side surface of the material conveying truck, and the distance between the opening and the bottom surface of the truck box is about 300 mm; when the mixer discharges materials to the material transporting vehicle, the vehicle moves back and forth and loads materials in several piles to reduce the separation site of aggregate; the transport capacity of the asphalt mixture transport vehicle is more than the mixing capacity and the paving speed, and five vehicles for transporting materials are arranged in front of the paver to wait for unloading; the material transporting vehicle is provided with a tarpaulin covering facility for heat preservation and rain prevention or avoiding environmental pollution; in the continuous paving process, the material conveying vehicle stops 10-30 cm before the paver, so that the material conveying vehicle is prevented from colliding with the paver.
When the asphalt mixture is paved, the paving speed of the paver is adjusted and selected according to the yield of the mixer, the matching condition of the construction machinery and the paving width of the paving thickness according to 2-6 m/min, so that the asphalt mixture is paved slowly, uniformly and uninterruptedly; controlling the paving thickness of the asphalt concrete by using a mobile automatic leveling reference device; paying attention to the operation degree of a receiving hopper of the paver to reduce aggregate segregation; when the spreading is in rain, the construction is immediately stopped, and the mixture which is not compacted and formed is removed.
When compaction molding is carried out on the asphalt mixture, in order to ensure the compaction degree and the flatness, the initial compaction should be carried out at a higher temperature after the paving as far as possible under the conditions that the mixture is not pushed, cracked and the like, and the road roller should be rolled at a slow and uniform speed, the road roller in the step in the embodiment selects the rubber-tyred road roller, and the rubber-tyred road roller can be used for brushing the surface of the tire by a mop 1: 3, preventing wheel sticking due to a mixed solution of diesel oil and water; obvious markers are arranged on the initial pressure paragraph equipment, the secondary pressure paragraph equipment and the final pressure paragraph equipment, so that a driver can conveniently recognize the obvious markers, and the working efficiency is improved.
And (3) processing longitudinal construction joints, reserving a spread layer with the width of 10-20 cm at the front paved mixture part as a rear elevation reference surface, overlapping the spread layer with the width of about 5-10 cm, finally performing bridging joint rolling to eliminate joints in a thermal joint mode, and staggering upper and lower longitudinal joints by more than 15 cm. Processing transverse construction joints, adopting flat joints, using a three-meter ruler to longitudinally position, setting the position of the joints at the positions where a spreading layer is separated from the ruler in a cantilever manner, and using a sawing and sewing machine to trim the joints; when the paving is continued, the mortar left in the gap sawing process is cleaned, a small amount of adhesive asphalt is coated, and the paver screed starts to pave from the gap; when rolling, the steel cylinder type roller is used for transverse compaction, and the steel cylinder type roller gradually moves to a new pavement layer from a gap on a pavement layer paved firstly.
And S500, mounting the side flat stone. Measuring and lofting, lofting by using a theodolite, measuring and setting the elevations of the curbstones and the flat stones by using a leveling instrument, setting and setting one elevation pile every 10m or so, and leveling by using a line; the concrete foundation cushion is poured, in the embodiment, the pouring material is C20 concrete, and the concrete foundation cushion is vibrated by a flat vibrator during pouring and is manually plastered so as to be more flat and solid. Then, the curbstone is installed firstly, prefabricated by C30 concrete according to the samples placed in advance, leveled and flat, and the seam width is consistent, and expansion seams are arranged at the positions 6m away from each other.
The implementation principle of the embodiment is as follows: firstly, constructing a soil roadbed, and tamping the roadbed of the road, thereby building a solid foundation for the construction of the road; then, constructing the cement lime soil base layer, further tamping the lower layer of the road, and reducing the influence of the rise and fall of the underground water level on the road; then, the cement stabilized macadam base is constructed, the cement stabilized macadam base can evenly diffuse the vehicle load borne by the road surface to the roadbed, and meanwhile, the cement stabilized macadam base has good drainage performance and can reduce water accumulated in the roadbed, so that the bearing capacity of the road is improved; then, the construction is carried out on the asphalt concrete pavement, and the asphalt concrete pavement has better smoothness after the construction is finished, so the driving is stable and comfortable, and the noise is low; finally, the installation of the side flat stones provides drainage for the sidewalk and the road surface, protects the edge of the road surface and separates the sidewalk from the roadway, thereby ensuring the safety of pedestrians.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A construction method of an urban road is characterized in that: the method comprises the following steps:
s100, performing temporary drainage work on the original ground before roadbed construction; before roadbed filling, removing ploughing and planting soil or surface sludge, digging and mixing ash, and rolling; splicing the junctions of the multiple sections of roadbed; compacting in sequence, and regularly checking the water content of the soil; filling and compacting 30cm of ultra wide soil on each side of the whole construction section;
s200, constructing a cement lime soil base layer, rolling by using a road roller and inspecting the soil base; preparing cement lime soil, wherein the cement lime soil construction adopts a stabilized soil mixer to perform road mixing method construction, soil and lime are uniformly spread on a roadbed according to a layer paving method according to a predetermined loose paving coefficient for a cement lime soil base layer with the thickness of 20cm, a smooth wheel road press is used for rolling for 1-2 times respectively, the stabilized soil mixer is adopted, the mixing depth is up to the bottom of a stabilized layer, watering mixing is performed, the water content and the mixing depth are checked, and then a grader is used for shaping and rolling; after the paving and rolling are finished, health preserving and traffic management are carried out;
s300, constructing a cement stabilized macadam foundation, and performing raw material inspection, equipment debugging and technical preparation before construction; adopting a paving scheme of centralized plant mixing, automobile transportation, on-site check, layered paving and total amount control; the construction adopts the schemes of road paving, cross operation, full-width rolling and half-width alignment; preparing a lower bearing layer; measuring and lofting; mixing the cement stabilized macadam mixture; detecting the mixture; transporting the cement stabilized macadam mixture; paving a cement stabilized macadam mixture; performing seam treatment; rolling the cement stabilized macadam mixture; carrying out health maintenance operation on the cement stabilized macadam base;
s400, constructing an asphalt concrete pavement, fully cleaning a lower layer which is paved for a long time before paving asphalt concrete, extracting test samples from all material sources, performing tests on all indexes of raw materials, and then preparing a mixture in a trial mode; stirring the asphalt mixture; transporting the asphalt mixture; paving an asphalt mixture; compacting and molding the asphalt mixture; treating construction joints;
and S500, mounting the side flat stone.
2. The construction method of an urban road according to claim 1, wherein: the following steps are added in the step S100: and S110, excavating and removing surface impurity and filling soil by 25cm in the road range, clearing and transporting garbage, and leveling the field.
3. The construction method of an urban road according to claim 1, wherein: in step S300, the seam processing is processing of longitudinal seams and transverse seams; when longitudinal joint treatment is carried out, the road section is divided into a plurality of independent operation sections, and coarse aggregates at joints in the independent operation sections are independently treated; the transverse seam processing is that the joint surface is processed after the paving is finished on the same day and the next day, and after a period of time.
4. The construction method of an urban road according to claim 3, wherein: the method for processing the connecting surface of the transverse seam processing comprises the steps of stopping construction until the position 5m from the tail end of the operation section on the same day, raking the mixed material of the section before the construction on the next day, mixing the raked material with new materials by workers, and rolling the raked material and the new paved section after leveling.
5. The construction method of an urban road according to claim 1, wherein: in the step S300, a three-wheel road roller is adopted to compact the lower layer; and compacting the surface layer by adopting a pneumatic tyre roller.
6. The construction method of an urban road according to claim 5, wherein: and the three-wheel road roller and the tire road roller repeatedly roll for 3 times.
7. The construction method of an urban road according to claim 1, wherein: in the step S400, when the asphalt mixture is stirred, the heating temperature of asphalt and aggregate and the delivery temperature of the asphalt mixture are mastered, the temperature of the aggregate is 10-20 ℃ higher than that of the asphalt, the temperature of a hot mixed material finished product is reduced by no more than 5 ℃ after the hot mixed material finished product is stored in a storage bin, and the storage time of the storage bin is no more than 48 hours; the control room of the mixing plant prints the asphalt, the consumption of various mineral aggregates and the mixing temperature disc by disc, and regularly checks the metering and temperature measurement of the mixing plant; the mixing time is determined by trial mixing, and all aggregate particles are completely wrapped by the asphalt mixture; checking the uniformity of the mixture and analyzing abnormal phenomena in time; asphalt samples were tested and analyzed daily.
8. The construction method of an urban road according to claim 7, wherein: the test method adopted for the asphalt mixture is a Marshall test.
9. One of the above-mentioned claims 1, characterized in that: in the step S400, when the compacting and molding operation is performed on the asphalt mixture, the initial pressing is performed at a high temperature after the asphalt mixture is completely spread.
10. One of the above-mentioned claims 1, characterized in that: in the step S500, lofting is carried out by using a theodolite, the elevation of the curbstone and the flat stone is measured by using a leveling instrument, an elevation pile is placed at certain intervals, and the piles are leveled by using lines; and (5) vibrating by adopting vibrating equipment during pouring, and manually plastering.
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