CN112195704A - Construction method of dense-skeleton type water-stable base layer in Gobi desert region - Google Patents
Construction method of dense-skeleton type water-stable base layer in Gobi desert region Download PDFInfo
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- CN112195704A CN112195704A CN202011037955.6A CN202011037955A CN112195704A CN 112195704 A CN112195704 A CN 112195704A CN 202011037955 A CN202011037955 A CN 202011037955A CN 112195704 A CN112195704 A CN 112195704A
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
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- Structural Engineering (AREA)
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Abstract
The application relates to the technical field of civil engineering, in particular to a construction method of a dense type cement stabilized macadam base layer in a Gobi desert area, which aims to solve the problems that the construction quality of a cement stabilized macadam base layer in the related technology is difficult to guarantee, the construction cost is high and the construction progress is slow, and comprises the following steps: s1, cement-stabilized gravel base course batching: the cement stabilizing gravel base layer comprises the components with the weight ratio of graded gravel to cement being 100:4.7 and the maximum dry density being 2.399g/cm3The optimal water content is 5.3 percent, wherein the grain size ratio of the graded gravel is 16-31.5mm to 9.5-19mm to 4.75-9.5mm to 0-4.75mm, 27 percent to 29 percent to 16 percent to 28 percent; s2, measuring and lofting; s3, paving a cement stable gravel base layer; s4, rolling cement to stabilize a gravel base layer; s5, edge finishing and seam processing; s6, maintenance and finished product protection. The invention can ensure that the cement stabilized gravel base layer in the Gobi desert region meets the requirement of good quality, and has the advantages of simple and practical method, low cost and energy conservationThe construction period and the service life are about long.
Description
Technical Field
The application relates to the technical field of civil engineering, in particular to a construction method of a dense-type water-stable base layer of a framework in a Gobi desert area.
Background
The cement stabilized macadam base layer has good integrity, large bearing capacity, strong freezing resistance and high early strength, and is generally applied to the construction of high-grade pavements, particularly expressways in China. But the construction of the cement stabilized macadam foundation presents diversity and complexity due to different varieties and physical properties of raw materials. Therefore, the engineering construction process needs to be good at analyzing, researching and finding out the reasons of the problems, and the working capacity of the engineering construction process is improved by continuously perfecting the construction practice and summarizing the experience. In addition, the cement stabilized macadam base is a bearing layer in a pavement structure and has enough strength, rigidity and water stability.
The stabilized macadam is prepared by mixing appropriate cement, macadam and water into the original loose macadam (including various coarse, medium and fine aggregates), stirring and spreading according to the technical requirements, curing and forming by a compactor at the optimum water content, wherein the cement is a hydraulic binding material, and most stones can be stabilized by the cement to improve the physical and mechanical properties of the stones. The cement stabilized macadam has good integrity, sufficient mechanical strength, water resistance and weather resistance. Its initial strength is high and increases with age.
In China, the gradation range of the cement stabilized macadam base layer specified by the specification is too wide, and in the range, the mechanical properties of the mixtures with different gradations are greatly different, so that the properties of the mixtures are difficult to explain even if various mechanical indexes of the cement stabilized macadam mixtures with different gradations completely meet the specification requirements.
In addition, the indoor forming mode is not matched with the field rolling mode, in China, most of inorganic stable binding materials adopt heavy compaction tests according to the requirements of the inorganic binding material stable material test regulations of highway engineering (JTG E51-2009), the inorganic stable binding materials are not matched with compaction of a vibratory roller in the actual engineering, the maximum dry density obtained by the tests is too small and is greatly different from the actual engineering, and in the construction of cement stabilized macadam base course, because the indoor heavy compaction forming is not matched with the outdoor vibratory compaction, two serious consequences are caused: one is that the degree of compaction is over one hundred. At each stage of inspection and acceptance, the degree of compaction is not allowed to exceed one hundred. This forces the construction unit to reduce the compaction degree by reducing the number of compaction passes during the construction process; secondly, cracks are severe.
In addition, the construction of cement stabilized macadam base in Gobi desert areas is greatly affected by thermal expansion and cold contraction, and the local area has many winds all the year round, untimely maintenance or insufficient maintenance, and is easy to generate engineering quality problems such as arch expansion and the like.
Disclosure of Invention
The application mainly aims to provide a construction method of a dense type cement stabilized macadam base layer in a Gobi desert area to solve the problems that the construction quality of a cement stabilized macadam base layer in the related art is difficult to guarantee, the construction cost is high, and the construction progress is slow.
The technical purpose of the application is realized by the following technical scheme:
a construction method of a dense type water-stable base layer of a framework in a Gobi desert area comprises the following steps:
s1, cement-stabilized gravel base course batching: the cement stabilizing gravel base layer comprises the components with the weight ratio of graded gravel to cement of 100:4.7 and the maximum dry density of 2.399g/cm3The optimal water content is 5.3 percent, wherein the grain size ratio of the graded gravel is 16-31.5mm to 9.5-19mm to 4.75-9.5mm to 0-4.75mm, 27 percent to 29 percent to 16 percent to 28 percent;
s2, measurement lofting: checking and accepting the pavement subbase layer in the planned construction section, wherein the checking and accepting project indexes are height, width, cross slope, center line offset, flatness, deflection and compactness, then recovering the center line on the lower bearing layer according to the given pile-by-pile coordinates, design elevation and design width in the design construction drawing, setting a pile every 10m when recovering the center line, externally arranging indication piles at the edges of the road shoulders at two sides, and marking the paving height of the cement stabilized macadam base layer edge by using an obvious mark on the indication piles;
s3, paving a cement stable gravel base layer: the automatic telescopic paver and the paver are adopted to carry out step-type combined paving operation, the center seam is assisted by manual trimming, the optimal walking speed of the paving operation is controlled to be 1.5-2m/min, the distance between the front part and the rear part of the two pavers is 5-10m, and the relative distance is kept stable;
s4, rolling cement to stabilize a gravel base layer: after paving and shaping, when the transverse gradient and the flatness are measured to be qualified and the water content is close to the optimal water content, immediately rolling, wherein the rolling length is 30-50m, the rolling sections are well-arranged, obvious boundary marks are arranged, continuous rolling is formed, the rolling sequence is carried out according to the straight line section and the curve section without the ultrahigh section from the edge to the middle, the curve section with the ultrahigh section is from the inner side of the curve to the outer side of the curve, static pressure to vibration pressure is carried out, and slow pressure to fast pressure is carried out;
s5, edge finishing and seam processing;
s6, maintenance and finished product protection: covering and fixing the geotextile on the top surface of the cement stabilization gravel base layer after rolling, contacting the membrane surface of the geotextile with the base layer surface, watering, maintaining and maintaining the period not less than 7 days, keeping the water stabilization layer in a wet state all the time, and clearing the cover after maintaining.
Optionally, in step S1, according to the grading design result, performing heavy compaction tests on the cement dosage according to five different proportions, namely 3.7%, 4.2%, 4.7%, 5.2% and 5.7%, to obtain the optimal water content and the maximum dry density of the mixture under different cement dosages, forming five groups of samples into cylindrical test pieces with a size of 150 × 150mm by a static pressure forming method according to the required compaction degree, placing the formed test pieces into a standard curing room for curing for 6 days, taking out the test pieces, soaking the test pieces in water for one day, and performing an unconfined compressive strength test.
Optionally, in step S1, the water content of the graded gravel is measured before mixing, so that the water consumption is increased by 0.5-1.5% based on the optimum water content according to the construction mix ratio of the mixed material prepared by adjustment, so that the water-stable gravel is compacted in a dry state.
Optionally, in step S2, steel piles are driven at both ends of the construction section, and the wire rope is tightened by a wire tightener to be used as a reference line for automatically controlling the elevation when the paver paves the steel rope without generating deflection.
Optionally, in step S3, the center of the left and right leveling sensors that naturally fall on the scale should be aligned with the left and right control sidelines of the base layer when the paver is walking, so as to ensure that the paving width and thickness are accurate.
Optionally, in step S4, the rolling method is static pressure of the vibratory roller at 22t for the first time, and the rolling speed is 1.5-2.0 km/h; the second time is the low-frequency small-amplitude vibration pressure of a 22t vibratory roller, and the rolling speed is 2.0-2.5 km/h; carrying out high-frequency large-amplitude rolling for the third time and the fourth time; and rolling and collecting the noodles by using a rubber wheel in the fifth time.
Optionally, in step S4, the delay time from the mixing with water to the completion of rolling of the cement stabilized macadam base mix should be no greater than 2.5 hours.
Optionally, in step S5, the joint processing is transverse joint processing after construction is finished, the flatness of the end cement stabilized macadam base layer is detected by using a 3m ruler, the cutting range is determined and scribed, and then the mixture with unqualified flatness is removed along the scribed line.
The invention has the beneficial effects that:
1. the scheme can effectively reduce the crack occurrence of the cement stabilized gravel base layer in the Gobi desert area, eliminates the longitudinal crack occurrence in hundreds of meters on the surface of the cement stabilized gravel base layer caused by the traditional method, realizes no crack in kilometers, and ensures that the cement stabilized gravel base layer reaches the quality high-quality standard.
2. The construction process is mature and simple, is convenient for field construction operation, can save 20 percent of cement materials, saves 10 days for construction period by paving, saves 1.2 yuan per square meter of maintenance cost, saves 0.68 yuan per square meter of health maintenance process, saves 30 percent of construction cost on the whole, shortens 15 percent of construction period and has better economic benefit.
3. The invention strengthens cement stable gravel base layer greatly, increases weight guide area and prolongs service life of road greatly, and the contrast test shows that the service life of two adjacent road sections connected with each other is prolonged by 5-6 times compared with the prior art, and the phenomena of loss, pavement cracking, collapse and hollowing are avoided.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort shall fall within the protection scope of the present application.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
A construction method of a dense type water-stable base layer of a framework in a Gobi desert area comprises the following steps:
s1, cement-stabilized gravel base course batching: the cement stabilizing gravel base layer comprises the components with the weight ratio of graded gravel to cement of 100:4.7 and the maximum dry density of 2.399g/cm3The optimal water content is 5.3 percent, wherein the grain size ratio of the graded gravel is 16-31.5mm to 9.5-19mm to 4.75-9.5mm to 0-4.75mm, 27 percent to 29 percent to 16 percent to 28 percent;
in the embodiment of the invention, the cement is Portland slag cement, and the graded gravel is four-grade aggregate of 16-31.5mm, 9.5-19mm, 4.75-9.5mm and 0-4.75 mm;
wherein, the design of mixture mix proportion: according to the design result of the graded gravel, carrying out heavy compaction tests according to five different proportions of road engineering inorganic binder stabilizing material test regulations (JTG E51-2009) and cement dosage of 3.7%, 4.2%, 4.7%, 5.2% and 5.7% to obtain the optimal water content and the maximum dry density of the mixed material under different cement dosages, then respectively forming cylindrical test pieces according to a design requirement compaction degree 98% static pressure forming method, wherein the size is 150 x 150mm, placing the formed test pieces into a standard curing chamber for curing for 6 days, taking out the test pieces, soaking for one day, carrying out an unconfined compressive strength test, and preferably selecting the cement dosage of the base cement stabilized macadam to be 4.7% according to the test result, engineering economy, field mixing and construction process;
before the mixture is formally mixed, the water content of the aggregate is measured according to the conditions of weather change, transport distance and the like, the water content of the graded gravel is measured before mixing, and the water consumption is improved by 0.5-1.5 percent on the basis of the optimal water content according to the construction mixing ratio for adjusting and preparing the mixed material, so that the water-stable gravel is compacted in a dry state, and the formation of floating slurry is avoided;
s2, measurement lofting: checking and accepting the pavement subbase layer in the planned construction section, wherein the checking and accepting project indexes are height, width, cross slope, center line offset, flatness, deflection and compactness, then recovering the center line on the lower bearing layer according to the given pile-by-pile coordinates, design elevation and design width in the design construction drawing, setting a pile every 10m when recovering the center line, externally arranging indication piles at the edges of the road shoulders at two sides, and marking the paving height of the cement stabilized macadam base layer edge by using an obvious mark on the indication piles;
specifically, the edge line of the cement stabilized macadam base course is marked out by lime, the elevation of the inner and outer side piles is calculated according to the designed slope ratio, the elevation of the control line is adjusted, after the elevation control piles are measured and set, steel bar piles are driven at two ends of a construction section, a wire tightener is used for tightening a steel wire rope to be used as a datum line for automatically controlling elevation when a paver paves, after the steel wire rope is tightened, a measurer fixes the steel wire rope in a groove of a cross rod of the steel bar pile and fastens the steel wire rope firmly by a binding wire, then adjusting the cross bar to make the plane position of the steel wire rope equal to the compacted thickness of the base layer multiplied by the loose paving coefficient and the reference relative elevation of the paver, according to the construction result of the test section of the base layer, the loose paving coefficient is determined to be 1.27, namely the loose paving thickness is 18cm multiplied by 1.27 to 22.86cm when paving, a sensor of the paver is controlled by a steel wire, the elevation of the top surface of the base course is controlled to ensure that the elevation of the cement stabilized macadam base course meets the standard requirement;
s3, paving a cement stable gravel base layer: the automatic telescopic paver and the paver are adopted to carry out step-type combined paving operation, the center seam is assisted by manual trimming, the optimal walking speed of the paving operation is controlled to be 1.5-2m/min, the distance between the front part and the rear part of the two pavers is 5-10m, and the relative distance is kept stable;
when the paver walks, the mixture is conveyed firstly, then the paver walks and paves, a transport vehicle stops about 10-30cm away from a hopper of the paver, the front of the paver abuts against the rear wheel of an automobile, then the hopper is lifted to discharge, the paver always keeps running in the same line direction when going, and the centers of left and right leveling sensors naturally falling on a scale plate when the paver walks are aligned with left and right control sidelines of a base layer so as to ensure accurate paving width and thickness;
during construction of the water stable layer, special attention needs to be paid to construction time limit, as the final strength of the water stable layer can be directly influenced by the activity of cement, the standing time of the water stable mixture after mixing is not too long, otherwise the activity of the cement can be lost, so that the strength of the water stable layer is reduced, the total time from mixing of the water stable mixture to final rolling forming is controlled within 2.5 hours, if other uncertain factors cause the total time to exceed 2.5 hours, the joint treatment can be firstly carried out on the part which is already spread and rolled and formed through field test verification, and the mixture which is not spread and mixed is discarded;
s4, rolling cement to stabilize a gravel base layer: after paving and shaping, when the transverse gradient and the flatness are measured to be qualified and the water content is close to the optimal water content, immediately rolling, wherein the rolling length is 30-50m, the rolling sections are well-arranged, obvious boundary marks are arranged, continuous rolling is formed, the rolling sequence is carried out according to the straight line section and the curve section without the ultrahigh section from the edge to the middle, the curve section with the ultrahigh section is from the inner side of the curve to the outer side of the curve, static pressure to vibration pressure is carried out, and slow pressure to fast pressure is carried out;
specifically, the rolling method comprises the steps of firstly, carrying out static pressure on a 22t vibratory roller at a rolling speed of 1.5-2.0 km/h; the second time is the low-frequency small-amplitude vibration pressure of a 22t vibratory roller, and the rolling speed is 2.0-2.5 km/h; carrying out high-frequency large-amplitude rolling for the third time and the fourth time; rolling and collecting the noodles by using a rubber wheel for the fifth time;
initial pressing: when the length of a paved and molded base layer reaches 30-50 meters, a 22t vibratory roller is used for static pressing for 1 time (the first time) at the speed of 1.5-1.7 kilometers per hour (the forward and backward movement is one time), the stop position of each advancing direction needs to be staggered for about 2m in the rolling process, the situation that bulges are generated on the same section due to the pushing of a mixture in the rolling process is prevented, and a specially-assigned person is arranged to shovel and level the larger bulge;
repressing: after the initial compaction is finished, weakly vibrating for one time (2 times) at the speed of 2-2.5 kilometers per hour by using a 22t vibratory roller, then strongly vibrating for 2 times (3 times and 4 times) at the speed of 2-2.5 kilometers per hour, immediately carrying out compaction degree detection and elevation measurement after rolling for one time, recording the rolling completion time, and if the compaction degree detection is not qualified after rolling for the fourth time, increasing the number of times of strong vibration until the compaction degree detection is qualified;
final pressure: after the re-pressing is finished, rolling the surface once at the speed of 1.5-1.7 kilometers per hour by using a 26t rubber-tyred roller, finally vibrating the surface of the roller to press the surface of the light once until no wheel tracks exist, immediately performing elevation measurement after the rolling is finished, and recording the rolling finishing time;
s5, edge finishing and seam processing;
the joint treatment is transverse joint treatment after construction is finished, firstly, the flatness of the cement stabilized macadam base layer at the end part is detected by using a 3m ruler, the cutting range is determined and marked, and then the mixed material with unqualified flatness is removed along the marked line;
s6, maintenance and finished product protection: covering and fixing the geotextile on the top surface of the cement stabilization gravel base layer after rolling, contacting the membrane surface of the geotextile with the base layer surface, watering, maintaining and maintaining the period not less than 7 days, keeping the water stabilization layer in a wet state all the time, and clearing the cover after maintaining.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A construction method of a dense type water-stable base layer of a framework in a Gobi desert area is characterized by comprising the following steps:
s1, cement-stabilized gravel base course batching: the cement stabilizing gravel base layer comprises the components with the weight ratio of graded gravel to cement being 100:4.7 and the maximum dry density being 2.399g/cm3The optimal water content is 5.3 percent, wherein the grain size ratio of the graded gravel is 16-31.5mm to 9.5-19mm to 4.75-9.5mm to 0-4.75mm, 27 percent to 29 percent to 16 percent to 28 percent;
s2, measurement lofting: checking and accepting the pavement subbase in the planned construction section, wherein the checking and accepting project indexes are elevation, width, cross slope, center line deviation, flatness, deflection and compaction degree, then recovering the center line on the lower bearing layer according to the given pile-by-pile coordinates, design elevation and design width in the design construction drawing, setting a pile every 10m when recovering the center line, externally arranging indication piles at the edges of the road shoulders at two sides, and marking the paving height of the cement stabilized macadam base layer edge by using obvious marks on the indication piles;
s3, paving a cement stable gravel base layer: adopting an automatic telescopic paver and a paver to carry out step-type combined paving operation, assisting the center seam with manual trimming, controlling the optimal walking speed of the paving operation to be 1.5-2m/min, and keeping the distance between the front part and the rear part of the two pavers to be 5-10m and the relative distance to be stable;
s4, rolling cement to stabilize a gravel base layer: after paving and shaping, when the transverse gradient and the flatness are measured to be qualified and the water content is close to the optimal water content, immediately rolling, wherein the rolling length is 30-50m, the rolling sections are well-arranged, obvious boundary marks are arranged, continuous rolling is formed, the rolling sequence is carried out according to a straight line section and a curve section without an ultrahigh section from the edge to the middle, the curve section with the ultrahigh section is from the inner side of a curve to the outer side of the curve, static pressure to vibration pressure is carried out, and slow pressure to fast pressure is carried out;
s5, edge finishing and seam processing;
s6, maintenance and finished product protection: covering and fixing the geotextile on the top surface of the cement stabilization gravel base layer after rolling, contacting the membrane surface of the geotextile with the base layer surface, watering, maintaining and maintaining the period not less than 7 days, keeping the water stabilization layer in a wet state all the time, and clearing the cover after maintaining.
2. The method for constructing a dense type water-stable base layer in a gobi desert area skeleton according to claim 1, wherein in step S1, according to the grading design result, five different proportions of 3.7%, 4.2%, 4.7%, 5.2% and 5.7% of cement dosage are subjected to heavy compaction tests to obtain the optimal water content and the maximum dry density of the mixture under different cement dosages, meanwhile, five groups of samples are respectively molded into cylindrical test pieces with the size of 150 x 150mm by a static pressure molding method according to the design requirement, and the molded test pieces are placed into a standard curing room for curing for 6 days, then taken out of water for one day, and subjected to the unconfined compressive strength test.
3. The method for constructing a dense type water-stable base course for a desert area skeleton of a Gobi (R) desert as claimed in claim 1, wherein in step S1, the water content of the graded gravel is measured before mixing, so that the water consumption is increased by 0.5-1.5% based on the optimum water content by adjusting the construction mix ratio of the mixed materials, and the water-stable gravel is compacted in a dry state.
4. The method for constructing a dense type water-stable base layer in a gobi desert area skeleton according to claim 1, wherein in step S2, reinforcing steel piles are driven at both ends of the construction section, and a wire tightener is used to tighten a wire rope to prevent deflection and to automatically control a standard height of the wire rope when the wire rope is used as a reference line for paving by a paver.
5. The method for constructing a dense type water-stable base layer in a gobi desert area according to claim 1, wherein in step S3, the centers of the left and right leveling sensors naturally falling on the ruler should be aligned with the left and right control sidelines of the base layer when the paver is walking, so as to ensure accurate paving width and thickness.
6. The construction method of the compact water-stable foundation of the framework in the Gobi desert region as claimed in claim 1, wherein in the step S4, the rolling method comprises a first step of static pressure of a 22t vibration roller, and the rolling speed is 1.5-2.0 km/h; the second time is the low-frequency small-amplitude vibration pressure of a 22t vibratory roller, and the rolling speed is 2.0-2.5 km/h; carrying out high-frequency large-amplitude rolling for the third time and the fourth time; and rolling and collecting the noodles by using a rubber wheel in the fifth time.
7. The method for constructing a compact water-stable base course for a desert area skeleton as claimed in claim 1, wherein the delay time from the mixing with water to the completion of rolling of the cement-stable macadam base course mixture in step S4 is not more than 2.5 hours.
8. The method for constructing a compact water-stable base layer for a framework in a gobi desert area according to claim 1, wherein the joint treatment in step S5 is a transverse joint treatment after the construction is finished, a 3m ruler is used to detect the flatness of the cement-stable crushed stone base layer at the end part, the cutting range is determined and the scribing is performed, and then the mixture with the unqualified flatness is removed along the scribed line.
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| CN113123197A (en) * | 2021-04-21 | 2021-07-16 | 鹏图建设有限公司 | Method and process for stabilizing macadam base with cement |
| CN113215890A (en) * | 2021-05-24 | 2021-08-06 | 中铁九局集团第六工程有限公司 | Paving construction method for cement-stabilized gravel base layer |
| CN114045729A (en) * | 2021-11-23 | 2022-02-15 | 中交一公局第一工程有限公司 | Anti-segregation crack-reducing construction method for cement stabilized aggregate base layer in low-temperature area |
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| CN113123197A (en) * | 2021-04-21 | 2021-07-16 | 鹏图建设有限公司 | Method and process for stabilizing macadam base with cement |
| CN113215890A (en) * | 2021-05-24 | 2021-08-06 | 中铁九局集团第六工程有限公司 | Paving construction method for cement-stabilized gravel base layer |
| CN114045729A (en) * | 2021-11-23 | 2022-02-15 | 中交一公局第一工程有限公司 | Anti-segregation crack-reducing construction method for cement stabilized aggregate base layer in low-temperature area |
| CN114045729B (en) * | 2021-11-23 | 2023-03-31 | 中交一公局第一工程有限公司 | Anti-segregation crack-reducing construction method for cement stabilized aggregate base layer in low-temperature region |
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