CN113152200A - Method for preventing and controlling cracks of road water-stable gravel base layer in reclamation area - Google Patents
Method for preventing and controlling cracks of road water-stable gravel base layer in reclamation area Download PDFInfo
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- CN113152200A CN113152200A CN202110303446.1A CN202110303446A CN113152200A CN 113152200 A CN113152200 A CN 113152200A CN 202110303446 A CN202110303446 A CN 202110303446A CN 113152200 A CN113152200 A CN 113152200A
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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
Abstract
The invention relates to the technical field of gap filling materials, and discloses a method for preventing and controlling cracks of a water-stable gravel base layer of a road in a reclamation area, which comprises the following steps of S1, measuring a pavement crack area; s2, stirring the mixture for use; s3, performing temperature shrinkage tests of an electrical measurement method under five different states of a water saturation state, an optimal water content state, a semi-air-drying state, an air-drying state and a drying state; s4, constructing by using an inverted structure; s5, cutting a seam and then paving a geogrid; s6, carrying out process construction and maintenance, wherein the main research results in the invention are as follows: a complete set of technology suitable for preventing and treating water-stable natural gravel semi-rigid base pavement cracking of roads in Xinjiang reclamation areas is provided from the aspects of raw material control, pavement structure, material grading design, construction process and the like. The reasonable cement dosage range and the optimal cement adding process of the water-stable natural gravel mixture in the Xinjiang reclamation area are researched. Solves the problems of proper cement dosage range and construction procedures, the cracking mechanism and the cracking interval of cement stabilized gravel layers and the like.
Description
Technical Field
The invention relates to the technical field of gap filling materials, in particular to a method for preventing and controlling cracks of a water-stable gravel base layer of a highway in a reclamation area.
Background
By the end of 2009, the total road mileage in China already exceeds 200 kilometers, and the highway traffic mileage breaks through 6 kilometers. China has completed the development course of three or forty years in developed countries in a short time of more than ten years. Particularly, after the 21 st century, the nation carries out the great strategy of western major development, high-grade highways in western and middle areas are rapidly developed, and the highway industry all over the country presents a splendid scene by the construction of access projects of rural and rural oil communication paths. Meanwhile, the demand for highway construction is also developing towards high-grade and high-standard directions, vehicles are required to be driven on roads safely, comfortably and economically at a certain speed, and the demand for road performance is also increasing. With the increase of traffic volume and the increase of automobile load, higher requirements are put on the overall strength and the flatness of the road surface. In order to meet the ever-increasing requirements of heavy traffic and heavy load on roads, China largely adopts semi-rigid base asphalt pavements with inorganic binder stabilized aggregates as a base and asphalt concrete as a surface.
As the cement stabilized macadam or gravel mixture is used in large quantity in China, the existing problems are slowly revealed, and as the cement stabilized macadam or gravel is brittle and is sensitive to the change of temperature and humidity, shrinkage cracking is easily caused by the change of temperature or humidity during the construction and use processes. Therefore, a reclamation area highway water-stable gravel base layer crack control method is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for preventing and controlling cracks of a water-stable gravel base layer of a road in a reclamation area, and solves the problems.
(II) technical scheme
In order to achieve the above purpose, the invention provides the following technical scheme: the method for preventing and controlling the cracks of the water-stable gravel base layer of the road in the reclamation area comprises the following steps:
s1, measuring a pavement crack area;
s2, stirring the mixture for use;
s3, performing temperature shrinkage tests of an electrical measurement method under five different states of a water saturation state, an optimal water content state, a semi-air-drying state (1/2 optimal water content), an air-drying state (1/5 optimal water content) and a drying state;
s4, constructing by using an inverted structure;
s5, cutting a seam and then paving a geogrid;
and S6, carrying out process construction and maintenance.
Preferably, the road surface sealing measurement in S1 specifically includes the following steps: step 1, calculating a crushing and filling range according to the distribution range of the cracks, wherein the length of the crushing range is larger than the length of the cracks by 1.5cm, and the width of the crushing range is larger than the width of the cracks by 1 cm.
Preferably, the mixture mixing procedure in S2 specifically includes the following steps:
a) drying the aggregate;
b) the raw materials are prepared according to the design grading (the natural grading is directly weighed according to the total weight). In the experiment of adding the fly ash instead of the experiment, the fly ash is added into the aggregate and mixed evenly);
c) adding a predetermined amount of water;
d) placing into a plastic bag, and soaking and stewing the materials;
e) after 4h, cement is added and uniformly mixed, and subsequent tests are carried out.
Preferably, the compression test in S3 tests the following test results: the cement stabilizing material base layer is doped with aggregate, so that the temperature shrinkage of the mixture can be obviously reduced; the temperature shrinkage of cement stabilized aggregates is smaller than that of lime fly ash stabilized aggregates and also smaller than that of lime stabilized aggregates.
Preferably, the construction method of the flip-chip structure in S4 includes the following specific construction methods and measures:
1) 20cm of the finished sub-base layer pavement is dug, the width of the original base layer is 10.4m of the designed width of the original shoulder, and the inner edge of the shoulder is straightened according to the designed width through manual cooperation with a grader. Ensuring the width of the subbase pavement;
2) and after the excavation is finished, leveling by a grader, watering and rolling the original pavement, and detecting the compactness, the flatness and the deflection of the pavement according to the detection requirement of the subbase layer. The lower bearing layer is ensured to be flat, compact and free from loosening, slurry turning and the like;
3) and after the pavement detection meets the design requirements, performing center line lofting and edge elevation sampling and hanging steel strand control. The paving and rolling processes are the same as those of the base layers of other test sections. The road section has a height difference at joints at two sides, and is in two-layer step lap joint by adopting a length of 15cm and a height of 10 cm;
4) after the layer of the gravel is cured, constructing base-layer graded gravel, wherein the construction method is carried out according to the construction process of the subbase layer;
preferably, the specific construction method for laying the geogrid by slitting in the step S5 is as follows:
1) after paving the cement stabilization base layer, watering for natural curing, and after curing, cutting one cutting seam every 10 meters along the direction of the transverse axis of the route by using a cutting machine;
2) after the joint cutting is finished, manually lapping the prepared geogrid with the length of 50cm and the width meeting the base layer pavement along each edge of the joint cutting by 25 cm;
3) after the geogrid is lapped, the geogrid is fixed by an iron sheet, so that the geogrid is prevented from being displaced by wheels when the vehicle sprays emulsified asphalt;
preferably, the construction process and maintenance measures in S6 specifically include the following steps:
1) preparing; preparing a lower bearing layer, checking the flatness, compactness and deflection value of the layer, and taking measures to treat unqualified positions, weak positions and low-lying pot holes to ensure that the surface of the lower bearing layer is compact and flat without any loose or weak positions;
2) construction lofting; and recovering the center line, determining the plane position of each 10 m section to accurately control the accuracy of the elevation of the section, and preparing each construction technology before paving aggregate. The elevation of the aggregate paving edge is controlled by hanging steel strands, and the error between each steel chisel point and each point of the steel strands is measured again before the aggregate paving. So as to avoid the unqualified flatness of the paver after the paving is finished. Marking the starting point and the ending point of each section of 200 meters by the display board according to the different sections divided by the centerline distance. So as to identify the position of each road section, and is beneficial to the collection of various construction data and parameters;
3) production and transportation of aggregates;
4) spreading;
5) and rolling.
Preferably, in step 3) of S6, the production and transportation of the aggregate are specifically as follows:
1) trial preparation is carried out before the mass production of the aggregates, the mass production can be carried out after the accuracy of the aggregate cement content is stable and the mass production is ensured, a cement dose spot check test is carried out during the production period so as to ensure that the accuracy of the cement content is changed, and the allowable deviation value of the cement content is +/-0.2;
2) in the aggregate trial preparation, the water content test of the aggregate is carried out, and the water content of the aggregate is preferably adjusted to be slightly more than 0.3-0.6 of the optimal water content according to the test result so as to prevent the water loss of the aggregate in the transportation and paving processes. The weather with too high temperature can be adjusted according to the field test condition. The moisture content of the aggregate during rolling is in principle at an optimum moisture content;
3) the vehicles need to be in place in time during aggregate transportation, the aggregate transportation vehicles can conveniently enter the construction section along the road junction according to the surrounding traffic environment of the road section, the situation that the material trucks roll back and forth on the lower bearing to damage the lower bearing layer is avoided to the greatest extent, and the specific vehicle transportation route is detailed in a test section construction plan.
Preferably, in step 4) of S6, the paving operation is as follows:
1) after the aggregate is transported to the site, the aggregate is quickly paved by manually matching with a paver, the paving speed is uniform, the phenomenon of stopping and waiting for the aggregate is strictly reduced when the paver is paved, and stable, efficient and ordered connection is formed between a transport vehicle and the paver;
2) before paving, various preparation works need to be prepared, the elevation needs to be strictly controlled, the discharging bottom plate of the paver can be lifted and adjusted to the road arch required by design through controlling the road arch, a straight line is pulled down on the bottom plate by a construction line, the height difference between measuring plates and lines is used in the road middle distance from the bottom plate, and the adjustment can be carried out if the road arch required by design cannot be achieved. The reasonable loose paving coefficient is grasped according to the primary trial paving, namely, the left, middle and right three-point elevations of each section of every 10 m are taken in the paving operation before the paving, the effective loose paving coefficient is converted by three-time height difference comparison after the paving and the rolling are finished and measured once each time;
3) after the aggregates are paved, the place where the coarse and fine particles are separated and the coarse aggregate nest are manually removed in time, the new mixture is used for filling, and the road roller is tightly pressed by the paver for one time so as to keep the moisture.
Preferably, in step 5) of S6, the rolling process includes the following steps: after paving, every 30-50 m of aggregate is a rolling section, and any vehicle is strictly forbidden to pass through in the rolling process. According to the rolling principle, the road shoulder is rolled into the road on the straight line section of the road with light weight, heavy weight, outer side and inner side, and the curve section is rolled from the inner side of the curve to the outer side. The rear wheels overlap 2/1 the wheel width during rolling. And the exposed unevenness is inspected at any time by a guiding rule manually in the rolling process, and the roller is leveled manually and quickly. Static pressure and micro vibration of the road roller with 18 tons of rolling passes are planned once, and static recovery of strong vibration is planned once for 3-4 times, and the concrete passes can be adjusted through a field test compaction result. The initial setting time of the cement is not easily exceeded for 3-4 hours from the production of the aggregate to the completion of the rolling detection, and the initial pressure of the rolling speed is preferably 2.0-2.5 km/h after 1.5-1.7 km/h.
(III) advantageous effects
Compared with the prior art, the invention provides a method for preventing and controlling the cracks of the water-stable gravel base layer of the road in the reclamation area, which has the following beneficial effects:
the research researches the prevention and control technology of cracks of the cement stabilized gravel base layer of the road in the reclamation area by performing indoor tests on the performances of the water stabilized gravel mixtures with different grades and different cement dosages and combining theoretical analysis, and provides a scheme for engineering application. The main research results are as follows: a complete set of technology suitable for preventing and treating water-stable natural gravel semi-rigid base pavement cracking of roads in Xinjiang reclamation areas is provided from the aspects of raw material control, pavement structure, material grading design, construction process and the like. The reasonable cement dosage range and the optimal cement adding process of the water-stable natural gravel mixture in the Xinjiang reclamation area are researched. The cracking distance of the natural gravel water-stable base layer of the road in the reclamation area is estimated theoretically and basically consistent with an actual measurement value, so that the problems of proper cement dosage range and construction procedures, the cracking mechanism and the cracking distance of the cement-stable gravel layer and the like are solved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): the method for preventing and controlling the cracks of the water-stable gravel base layer of the road in the reclamation area comprises the following steps:
s1, measuring a pavement crack area;
s2, stirring the mixture for use;
s3, performing temperature shrinkage tests of an electrical measurement method under five different states of a water saturation state, an optimal water content state, a semi-air-drying state (1/2 optimal water content), an air-drying state (1/5 optimal water content) and a drying state;
s4, constructing by using an inverted structure;
s5, cutting a seam and then paving a geogrid;
and S6, carrying out process construction and maintenance.
The road surface locking measurement in the S1 specifically comprises the following steps: step 1, calculating a crushing and filling range according to the distribution range of the cracks, wherein the length of the crushing range is larger than the length of the cracks by 1.5cm, and the width of the crushing range is larger than the width of the cracks by 1 cm.
The mixture mixing procedure in the S2 specifically comprises the following steps:
a) drying the aggregate;
b) the raw materials are prepared according to the design grading (the natural grading is directly weighed according to the total weight). In the experiment of adding the fly ash instead of the experiment, the fly ash is added into the aggregate and mixed evenly);
c) adding a predetermined amount of water;
d) placing into a plastic bag, and soaking and stewing the materials;
e) after 4h, cement is added and uniformly mixed, and subsequent tests are carried out.
The compression test in S3 tests the following test results: the cement stabilizing material base layer is doped with aggregate, so that the temperature shrinkage of the mixture can be obviously reduced; the temperature shrinkage of cement stabilized aggregates is smaller than that of lime fly ash stabilized aggregates and also smaller than that of lime stabilized aggregates.
The construction method of the inverted structure in the S4 comprises the following specific construction methods and measures:
1) 20cm of the finished sub-base layer pavement is dug, the width of the original base layer is 10.4m of the designed width of the original shoulder, and the inner edge of the shoulder is straightened according to the designed width through manual cooperation with a grader. Ensuring the width of the subbase pavement;
2) and after the excavation is finished, leveling by a grader, watering and rolling the original pavement, and detecting the compactness, the flatness and the deflection of the pavement according to the detection requirement of the subbase layer. The lower bearing layer is ensured to be flat, compact and free from loosening, slurry turning and the like;
3) and after the pavement detection meets the design requirements, performing center line lofting and edge elevation sampling and hanging steel strand control. The paving and rolling processes are the same as those of the base layers of other test sections. The road section has a height difference at joints at two sides, and is in two-layer step lap joint by adopting a length of 15cm and a height of 10 cm;
4) and after the layer is cured, constructing the base layer graded gravel, wherein the construction method is carried out according to the base layer construction process.
The specific construction method for laying the geogrid by cutting the seams in the S5 comprises the following steps:
1) after paving the cement stabilization base layer, watering for natural curing, and after curing, cutting one cutting seam every 10 meters along the direction of the transverse axis of the route by using a cutting machine;
2) after the joint cutting is finished, manually lapping the prepared geogrid with the length of 50cm and the width meeting the base layer pavement along each edge of the joint cutting by 25 cm;
3) and after the overlapping of the geogrids is finished, the geogrids are fixed by using iron sheets, so that the geogrids are prevented from being displaced by wheels when the vehicle sprays emulsified asphalt.
The construction process and maintenance measures in the step S6 specifically comprise the following steps:
1) preparing; preparing a lower bearing layer, checking the flatness, compactness and deflection value of the layer, and taking measures to treat unqualified positions, weak positions and low-lying pot holes to ensure that the surface of the lower bearing layer is compact and flat without any loose or weak positions;
2) construction lofting; and recovering the center line, determining the plane position of each 10 m section to accurately control the accuracy of the elevation of the section, and preparing each construction technology before paving aggregate. The elevation of the aggregate paving edge is controlled by hanging steel strands, and the error between each steel chisel point and each point of the steel strands is measured again before the aggregate paving. So as to avoid the unqualified flatness of the paver after the paving is finished. Marking the starting point and the ending point of each section of 200 meters by the display board according to the different sections divided by the centerline distance. So as to identify the position of each road section, and is beneficial to the collection of various construction data and parameters;
3) production and transportation of aggregates;
4) spreading;
5) and rolling.
In the step 3) of S6, the production and transportation of the aggregate are specifically as follows:
1) trial preparation is carried out before the mass production of the aggregates, the mass production can be carried out after the accuracy of the aggregate cement content is stable and the mass production is ensured, a cement dose spot check test is carried out during the production period so as to ensure that the accuracy of the cement content is changed, and the allowable deviation value of the cement content is +/-0.2;
2) in the aggregate trial preparation, the water content test of the aggregate is carried out, and the water content of the aggregate is preferably adjusted to be slightly more than 0.3-0.6 of the optimal water content according to the test result so as to prevent the water loss of the aggregate in the transportation and paving processes. The weather with too high temperature can be adjusted according to the field test condition. The moisture content of the aggregate during rolling is in principle at an optimum moisture content;
3) the vehicles need to be in place in time during aggregate transportation, the aggregate transportation vehicles can conveniently enter the construction section along the road junction according to the surrounding traffic environment of the road section, the situation that the material trucks roll back and forth on the lower bearing to damage the lower bearing layer is avoided to the greatest extent, and the specific vehicle transportation route is detailed in a test section construction plan.
In the step 4) of S6, the paving operation is as follows:
1) after the aggregate is transported to the site, the aggregate is quickly paved by manually matching with a paver, the paving speed is uniform, the phenomenon of stopping and waiting for the aggregate is strictly reduced when the paver is paved, and stable, efficient and ordered connection is formed between a transport vehicle and the paver;
2) before paving, various preparation works need to be prepared, the elevation needs to be strictly controlled, the discharging bottom plate of the paver can be lifted and adjusted to the road arch required by design through controlling the road arch, a straight line is pulled down on the bottom plate by a construction line, the height difference between measuring plates and lines is used in the road middle distance from the bottom plate, and the adjustment can be carried out if the road arch required by design cannot be achieved. The reasonable loose paving coefficient is grasped according to the primary trial paving, namely, the left, middle and right three-point elevations of each section of every 10 m are taken in the paving operation before the paving, the effective loose paving coefficient is converted by three-time height difference comparison after the paving and the rolling are finished and measured once each time;
3) after the aggregates are paved, the place where the coarse and fine particles are separated and the coarse aggregate nest are manually removed in time, the new mixture is used for filling, and the road roller is tightly pressed by the paver for one time so as to keep the moisture.
In the step 5) of S6, the rolling operation is specifically as follows: after paving, every 30-50 m of aggregate is a rolling section, and any vehicle is strictly forbidden to pass through in the rolling process. According to the rolling principle, the road shoulder is rolled into the road on the straight line section of the road with light weight, heavy weight, outer side and inner side, and the curve section is rolled from the inner side of the curve to the outer side. The rear wheels overlap 2/1 the wheel width during rolling. And the exposed unevenness is inspected at any time by a guiding rule manually in the rolling process, and the roller is leveled manually and quickly. Static pressure and micro vibration of the road roller with 18 tons of rolling passes are planned once, and static recovery of strong vibration is planned once for 3-4 times, and the concrete passes can be adjusted through a field test compaction result. The initial setting time of the cement is not easily exceeded for 3-4 hours from the production of the aggregate to the completion of the rolling detection, and the initial pressure of the rolling speed is preferably 2.0-2.5 km/h after 1.5-1.7 km/h.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. Reclamation district highway water stable gravel base course crack control method, its characterized in that: the method comprises the following steps:
s1, measuring a pavement crack area;
s2, stirring the mixture for use;
s3, performing temperature shrinkage tests of an electrical measurement method under five different states of a water saturation state, an optimal water content state, a semi-air-drying state (1/2 optimal water content), an air-drying state (1/5 optimal water content) and a drying state;
s4, constructing by using an inverted structure;
s5, cutting a seam and then paving a geogrid;
and S6, carrying out process construction and maintenance.
2. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the road surface locking measurement in the S1 specifically comprises the following steps: step 1, calculating a crushing and filling range according to the distribution range of the cracks, wherein the length of the crushing range is larger than the length of the cracks by 1.5cm, and the width of the crushing range is larger than the width of the cracks by 1 cm.
3. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the mixture mixing procedure in the S2 specifically comprises the following steps:
a) drying the aggregate;
b) the natural grading is prepared step by step (the natural grading is directly weighed according to the total weight, the fly ash is added into the aggregate in the experiment, and the fly ash is mixed and stirred uniformly);
c) adding a predetermined amount of water;
d) placing into a plastic bag, and soaking and stewing the materials;
e) after 4h, cement is added and uniformly mixed, and subsequent tests are carried out.
4. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the compression test in S3 tests the following test results: the cement stabilizing material base layer is doped with aggregate, so that the temperature shrinkage of the mixture can be obviously reduced; the temperature shrinkage of cement stabilized aggregates is smaller than that of lime fly ash stabilized aggregates and also smaller than that of lime stabilized aggregates.
5. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the construction method of the inverted structure in the S4 comprises the following specific construction methods and measures:
1) digging 20cm of the finished subbase pavement, reserving an original shoulder with the width of 10.4m designed for the original base course, and straightening the inner edge of the shoulder according to the designed width by manually matching with a grader to ensure the width of the subbase pavement;
2) after the excavation is finished, leveling by a grader, spraying water on the original pavement for rolling, detecting the compaction degree, the leveling degree and the deflection of the pavement according to the detection requirements of the subbase layer, and ensuring that the lower bearing layer is smooth, compact and free of loosening, grout turnover and other phenomena;
3) after the pavement detection meets the design requirements, performing center line lofting, adopting hanging steel stranded wires at the side elevation for control, paving and rolling the same as the base layer process of other test sections, wherein the height difference exists at joints at two sides of the section, and adopting the length of 15cm and the height of 10cm for carrying out two-layer step lap joint;
4) and after the layer is cured, constructing the base layer graded gravel, wherein the construction method is carried out according to the base layer construction process.
6. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the specific construction method for laying the geogrid by cutting the seams in the S5 comprises the following steps:
1) after paving the cement stabilization base layer, watering for natural curing, and after curing, cutting one cutting seam every 10 meters along the direction of the transverse axis of the route by using a cutting machine;
2) after the joint cutting is finished, manually lapping the prepared geogrid with the length of 50cm and the width meeting the base layer pavement along each edge of the joint cutting by 25 cm;
3) and after the overlapping of the geogrids is finished, the geogrids are fixed by using iron sheets, so that the geogrids are prevented from being displaced by wheels when the vehicle sprays emulsified asphalt.
7. The reclamation area highway unstable gravel base layer crack control method of claim 1, characterized in that: the construction process and maintenance measures in the step S6 specifically comprise the following steps:
1) preparing; preparing a lower bearing layer, checking the flatness, compactness and deflection value of the layer, and taking measures to treat unqualified positions, weak positions and low-lying pot holes to ensure that the surface of the lower bearing layer is compact and flat without any loose or weak positions;
2) construction lofting; recovering a central line, determining the plane position of each 10 m section to accurately control the accuracy of the section elevation, preparing various construction technology preparations before aggregate paving, controlling the elevation of an aggregate paving edge by hanging steel strands, and repeatedly measuring the errors between steel drill points and between steel drill points of the steel strands before the aggregate paving so as to avoid unqualified flatness after the paving of a paver;
3) production and transportation of aggregates;
4) spreading;
5) and rolling.
8. The reclamation area highway unstable gravel base layer crack control method of claim 7, characterized in that: in the step 3) of S6, the production and transportation of the aggregate are specifically as follows:
1) trial preparation is carried out before the mass production of the aggregates, the mass production can be carried out after the accuracy of the aggregate cement content is stable and the mass production is ensured, a cement dose spot check test is carried out during the production period so as to ensure that the accuracy of the cement content is changed, and the allowable deviation value of the cement content is +/-0.2;
2) in the aggregate trial preparation, the water content of the aggregate is tested, and the water content of the aggregate is adjusted to be slightly more than 0.3-0.6 of the optimal water content according to the test result so as to prevent the water loss of the aggregate in the transportation and paving processes, and the weather with too high temperature is adjusted according to the field test condition so that the water content of the aggregate in the rolling process is in the optimal water content in principle;
3) the vehicles need to be in place in time during aggregate transportation, the aggregate transportation vehicles can conveniently enter the construction section along the road junction according to the surrounding traffic environment of the road section, the situation that the material trucks roll back and forth on the lower bearing to damage the lower bearing layer is avoided to the greatest extent, and the specific vehicle transportation route is detailed in a test section construction plan.
9. The reclamation area highway unstable gravel base layer crack control method of claim 7, characterized in that: in the step 4) of S6, the paving operation is as follows:
1) after the aggregate is transported to the site, the aggregate is quickly paved by manually matching with a paver, the paving speed is uniform, the phenomenon of stopping and waiting for the aggregate is strictly reduced when the paver is paved, and stable, efficient and ordered connection is formed between a transport vehicle and the paver;
2) before paving, various preparation works need to be prepared, the elevation needs to be strictly controlled, the control of an arch can lift and adjust a discharging bottom plate of a paver to the arch of the road required by design, a construction line is used for pulling down a straight line on the bottom plate, the height difference between a measuring tape measuring plate and the line is used in the road middle distance bottom plate, if the arch of the road required by the design cannot be met, the adjustment can be carried out, the reasonable loose coefficient needs to be mastered according to the primary trial paving, namely, the left, middle and right three-point elevations of each section of every 10 meters are taken in the paving operation before paving, the paving and rolling are measured once after being finished, and the effective loose coefficient is converted through the three-time height difference comparison;
3) after the aggregates are paved, the place where the coarse and fine particles are separated and the coarse aggregate nest are manually removed in time, the new mixture is used for filling, and the road roller is tightly pressed by the paver for one time so as to keep the moisture.
10. The reclamation area highway unstable gravel base layer crack control method of claim 7, characterized in that: in the step 5) of S6, the rolling operation is specifically as follows: after paving aggregate, every 30-50 m is a rolling section, in the rolling process, any vehicle is strictly forbidden to pass, the rolling principle is that firstly, the weight is light, then the weight is heavy, then the road is rolled from the road shoulder to the road on the straight line section, the curve section is rolled from the inner side of the curve to the outer side, in the rolling process, the rear wheel is overlapped 2/1 wheels wide and exceeds the seams at the two ends, in the rolling process, a guiding rule is manually used for checking exposed unevenness at any time, manual rapid leveling is performed, 18 tons of road rollers are planned to perform static pressure once, micro vibration once and strong shock once for 3-4 times, the specific number of times can be adjusted through a field test compaction degree result, 3-4 hours which does not exceed the initial setting time of cement easily are performed when the production of the aggregate is rolled and the rolling detection is completed, and 2.0-2.5 km/h is preferably adopted after the initial pressing speed is 1.5-1.7 km/h.
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| CN114214895A (en) * | 2021-12-03 | 2022-03-22 | 中交一公局西北工程有限公司 | Construction process of water-stable base course in large-temperature-difference area |
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2021
- 2021-03-22 CN CN202110303446.1A patent/CN113152200A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114214895A (en) * | 2021-12-03 | 2022-03-22 | 中交一公局西北工程有限公司 | Construction process of water-stable base course in large-temperature-difference area |
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