CN110904758A - Construction method for cement-stabilized gravel base course in extra-high-temperature strong-wind arid region - Google Patents
Construction method for cement-stabilized gravel base course in extra-high-temperature strong-wind arid region Download PDFInfo
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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
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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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Abstract
The invention belongs to a construction method of a cement stabilization gravel base layer in an extra-high temperature strong wind arid region. Wherein: the particle size proportion of the medium-grade gravel of the cement stabilized gravel base layer is as follows: 19-31.5 mm, 9.5-19 mm, 4.75-9.5 mm, 0-4.75 mm =20%, 32%, 22%, 26%; the cement stabilized gravel base layer comprises the following components in percentage by weight: the graded gravel comprises cement and basalt fiber =100:4.5: 3; maximum dry density 2.506g/cm3The water content was 4.4%, and the EDTA consumption was 15.1 ml. The method can ensure that the cement stabilized gravel base layer in the extra-high temperature strong wind arid region meets the requirement of excellent quality, and has the advantages of simplicity, convenience, practicability, low cost, construction period saving, good quality and long service life.
Description
Technical Field
The invention belongs to a construction method of a cement-stabilized gravel base layer in an extra-high temperature strong wind arid region.
Background
The highway pavement is formed by taking crushed stones with the thickness of 15cm as an underlayer, arranging a cement stabilizing gravel base layer with the thickness of 34cm at the upper end of the underlayer, and then laying an asphalt surface layer with the thickness of 19cm on the upper end, the middle end and the upper end of the cement stabilizing gravel base layer, wherein the cement stabilizing gravel base layer plays a role in starting and stopping, and indexes of integrity, strength and compactness of the cement stabilizing gravel base layer play a key role in the quality of a highway. At present, more and more highway construction projects are provided in northwest of China, desert and gobi beach areas are provided in high-temperature, strong-wind and arid climates in northwest of China, particularly, areas under Turpan flame mountains in Xinjiang, the average temperature in summer is about 40 ℃, the highest temperature is higher than 80 ℃, strong wind is higher than 6 grades throughout the year, the highest grade is 12 grades, the annual precipitation is about 16 millimeters, and the evaporation capacity is higher than 3000 millimeters.
Disclosure of Invention
The invention aims to provide a construction method for a cement stabilization gravel base layer in an extra-high temperature strong wind arid region, which can ensure that the cement stabilization gravel base layer in the extra-high temperature strong wind arid region meets the requirement of excellent quality and has the advantages of simple and practical method, low cost, construction period saving, good quality and long service life.
Therefore, the construction method of the cement-stabilized gravel base course in the extra-high temperature strong wind arid region comprises the following steps:
(1) cement-stabilized gravel base course batching: the particle size proportion of the medium-grade gravel of the cement stabilized gravel base layer is as follows: 19-31.5 mm, 9.5-19 mm, 4.75-9.5 mm, 0-4.75 mm =20%, 32%, 22%, 26%.
The cement stabilized gravel base layer comprises the following components in percentage by weight: graded gravel cement basalt fiber =100:4.5: 3. Maximum dry density 2.506g/cm3The water content was 4.4%, and the EDTA consumption was 15.1 ml.
(2) Paving a cement-stabilized gravel base layer: the method is divided into one-time full-thickness forming paving or two-time single-layer steel mesh paving.
The once full-thickness forming and paving is realized by using an anti-segregation middle and large paver Power-DT1900 at one time, wherein the 34cm full-thickness and 12.35m full-width once paving and forming are realized.
The two-time single-layer steel mesh spreading is that a first layer of spreading layer with the full thickness of 17cm and the full width of 12.35m is firstly realized by using an anti-segregation middle and large spreading machine Power-DT1900, a reinforcing mesh with 20 multiplied by 20cm grids formed by reinforcing steel bars with the diameter of 5mm in a horizontal and vertical distribution mode at intervals is arranged on the first layer of spreading layer, and then a second layer of spreading layer with the full thickness of 17cm and the full width of 12.35m is formed on the reinforcing mesh by using the anti-segregation middle and large spreading machine Power-DT 1900.
(3) Rolling of cement stabilized gravel base layer: once the paving is finished, the rolling of a cement stabilization gravel base layer is immediately carried out, or the construction that the front paving is finished and the rolling is carried out next to the rear is ensured.
Initial pressure stage: firstly, carrying out static pressure half time by using an HD130 double-steel-wheel road roller, and carrying out rolling at the speed of 1.5-1.7 km/h, after ensuring the flatness, directly carrying out forced vibration 0.5 time by using a Yz36 single-steel-wheel road roller and kneading 0.5 time by using an YL37 rubber-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h.
And (3) a repressing stage: strongly vibrating by using a Yz36 single steel wheel road roller and kneading and pressing by using an YL37 rubber wheel road roller, wherein the rolling speed is 2.0-2.5 km/h to form combined circular rolling; and 6 times of combined circulating rolling is carried out on the cement stabilizing gravel base layer which can be segmented through initial pressing, so that the degree of compaction is ensured.
And (3) final pressure stage: and (3) carrying out static pressure for 4 times by using an HD130 double-steel-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h, and the surface is compacted by static pressure.
(4) Cement stabilized gravel base course curing: once rolling is completed, the cement stabilized gravel base layer is immediately cured, or the construction of curing immediately after rolling is completed in front is guaranteed. After the cement stabilized gravel base layer is rolled, spraying water is sprayed on the surface of the cement stabilized gravel base layer by using a sprinkler, and the water spraying amount is 8-10 liters/m2. Then spread the health preserving film on cement stabilization gravel basic unit surface, then cover geotechnological cloth on the health preserving film, be the interval distance on the geotechnological cloth and press environmental protection sand bag, the geotechnological cloth and the film pile of basic unit both sides bury natural gravel, accomplish the peripheral sealing of health preserving film and geotechnological cloth and fix, and the health preserving period is 5 ~ 7 days, takes off from health preserving film and geotechnological cloth.
(5) Testing and detecting a cement stabilized gravel base layer: and carrying out compaction degree detection on the cement stabilization gravel base layer, and processing the points which are not detected to be qualified until the cement stabilization gravel base layer is qualified.
The basalt fiber is 10-14 mm in fiber length and 23-37 um in diameter.
The ratio of 0.075mm particles in the graded grit is less than 5%.
The paving time and the rolling time of the cement stabilization gravel base layer are less than 10 minutes.
The time for completing rolling and watering the cement stabilization gravel base course for curing is less than 10 minutes.
The above method achieves the object of the present invention.
The method can ensure that the cement stabilized gravel base layer in the extra-high temperature strong wind arid region meets the requirement of excellent quality, and has the advantages of simplicity, convenience, practicability, low cost, construction period saving, good quality and long service life.
Compared with the prior art, the invention has the following advantages and positive effects:
(1) the method can effectively reduce the crack generation of the cement stabilization gravel base layer in the drought area with extremely high temperature and strong wind, avoids the longitudinal generation of cracks in hundreds of meters on the surface of the cement stabilization gravel base layer by using the traditional method, realizes no cracks in kilometers, and ensures that the cement stabilization 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 greatly strengthens the cement stabilized gravel base layer, increases the weight guide area and greatly prolongs the service life of the highway. A comparison test shows that the service life of two adjacent roads in the connected section 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
Example 1: a construction method for a cement-stabilized gravel base layer in an extra-high temperature strong wind arid region comprises the following steps:
(1) cement-stabilized gravel base course batching: the particle size proportion of the medium-grade gravel of the cement stabilized gravel base layer is as follows: 19-31.5 mm, 9.5-19 mm, 4.75-9.5 mm, 0-4.75 mm =20%, 32%, 22%, 26%.
The cement stabilized gravel base layer comprises the following components in percentage by weight: graded gravel cement basalt fiber =100:4.5: 3. Maximum dry density 2.506g/cm3The water content was 4.4%, and the EDTA consumption was 15.1 ml. The basalt fiber is 10-14 mm in fiber length and 23-37 um in diameter, and the basalt fiber and the EDTA are commercially available products. The ratio of 0.075mm particles in the graded grit is less than 5%.
The graded gravel is selected from K3407+700 and the graded gravel of a stock ground of 3.5km, and the test shows that all technical indexes meet the design and specification requirements, and the test results are shown in a table 1-1.
TABLE 1-1 grading gravel quality technical index
The Tianshan brand P.O42.5H cement produced by Turpan Tianshan cement plant is selected, and the test results show in tables 1-2 that various technical indexes meet the design and specification requirements.
TABLE 1-2 technical indices of cement quality
The invention is applied to the G30 Huohang expressway Turpan to Xiaocao lake section Tuerbiao, and greatly reduces the crack of the water-stable base course. And the crack in the cement stabilized gravel base layer is longitudinally grown by using the traditional ingredients, and the core sample is loose and incomplete. The invention realizes the good effect of no crack in kilometers for the first time, the core sample is compact and complete, the plate property is good, the cement-stabilized gravel base layer has no lateral limit compressive strength of not less than 5MPa for 7 days, the compactness (surface vibration compaction method) is more than or equal to 98 percent, the performance indexes of the water-stabilized road surface are ensured to meet the specification and design requirements, and the service life of the road surface is prolonged.
(2) Paving a cement-stabilized gravel base layer: the once full-thickness forming and paving is adopted to realize once paving and forming of 34cm full thickness and 12.35m full width by using an anti-segregation middle and large paver Power-DT1900 at one time.
(3) Rolling of cement stabilized gravel base layer: in the extra-high temperature and strong wind arid areas, the integrity of a water-stable core sample cannot be ensured usually by rolling a 34cm thick base layer by a traditional method, the integrity of the core sample is difficult to ensure, cement paste with the bonding effect is quickly shrunk after being spread, the bonding effect is lost, and the cement-stable gravel base layer cannot form an integral plate structure.
Once paving is finished, the invention immediately rolls the cement stabilization gravel base layer or ensures that the paving in front is finished and the construction of rolling is carried out next to the base layer. The paving time and the rolling time of the cement stabilization gravel base layer are less than 10 minutes. The rolling process is as follows:
initial pressure stage: firstly, carrying out static pressure half time by using an HD130 double-steel-wheel road roller, and carrying out rolling at the speed of 1.5-1.7 km/h, after ensuring the flatness, directly carrying out forced vibration 0.5 time by using a Yz36 single-steel-wheel road roller and kneading 0.5 time by using an YL37 rubber-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h.
And (3) a repressing stage: strongly vibrating by using a Yz36 single steel wheel road roller and kneading and pressing by using an YL37 rubber wheel road roller, wherein the rolling speed is 2.0-2.5 km/h to form combined circular rolling; and 6 times of combined circulating rolling is carried out on the cement stabilizing gravel base layer which can be segmented through initial pressing, so that the degree of compaction is ensured. The strong vibration is a strong vibration operating button for starting the road roller.
And (3) final pressure stage: and (3) carrying out static pressure for 4 times by using an HD130 double-steel-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h, and the surface is compacted by static pressure.
The rolling of the road surface is completed once. HD130 double steel wheel road roller is hammer two steel wheel road rollers, Yz36 single steel wheel road roller etc. are different mechanical model road rollers.
The rolling process effectively prevents the problems that the water content of the water-stable mixture is too fast due to the influence of extra-high temperature, strong wind and drought climate, the traditional rolling process is not easy to roll and form the water-stable mixture at the optimal water content, and the integrity of a core sample is difficult to ensure, thereby not only ensuring the compaction degree of the water stability and ensuring the good integrity of the water stability and the integrity of the core sample, but also ensuring that various indexes of the flatness, the gradient and the like of the water stability meet the standard and the design requirements.
(4) Cement stabilized gravel base course curing: once rolling is completed, the cement stabilized gravel base layer is immediately cured, or the construction of curing immediately after rolling is completed in front is guaranteed. The time for completing rolling and watering the cement stabilization gravel base course for curing is less than 10 minutes. After the cement stabilized gravel base layer is rolled, spraying water is sprayed on the surface of the cement stabilized gravel base layer by using a sprinkler, and the water spraying amount is 8-10 liters/m2。
Then, a health preserving film is paved on the surface of the cement stabilizing gravel base layer, geotextile covers the health preserving film, the geotextile is provided with an interval distance pressing environment-friendly sand bag, natural gravel is piled on the geotextile and the film on two sides of the base layer, the health preserving film and the geotextile are sealed and fixed at the periphery, the health preserving period lasts for 5-7 days, and the health preserving film and the geotextile are taken off. Raw films and geotextiles are commercially available products.
(5) Testing and detecting a cement stabilized gravel base layer: and carrying out compaction degree detection on the cement stabilization gravel base layer, and processing the points which are not detected to be qualified until the cement stabilization gravel base layer is qualified.
Example 2: example 2 differs from example 1 in that: paving a cement-stabilized gravel base layer in the step (2): the method comprises the steps of adopting two single-layer steel mesh pavements, wherein the two single-layer steel mesh pavements are a first layer of paving layer which is formed by using an anti-segregation middle and large paver Power-DT1900 to achieve the full width of 17cm and 12.35m, immediately placing a 20 multiplied by 20cm mesh reinforcing mesh which is formed by reinforcing steel bars with the diameter of 5mm in a horizontal and vertical distribution mode at intervals on the first layer of paving layer, and then using the anti-segregation middle and large paver Power-DT1900 on the reinforcing mesh to achieve the second layer of paving layer forming which is formed by using the 17cm full thickness and 12.35m in the full width. The total original degree of the paved cement stable gravel base layer is 34 cm. The reinforcing mesh arranged in the cement stabilization gravel base layer can increase the integral tension, strength and plate structure. The remaining steps are the same as in example 1 and will not be repeated.
In a word, the method can ensure that the cement stabilized gravel base layer in the extra-high temperature strong wind arid region meets the requirement of excellent quality, and has the advantages of simple and practical method, low cost, construction period saving, good quality and long service life.
Claims (5)
1. The construction method of the cement-stabilized gravel base course in the extra-high-temperature strong-wind arid region is characterized by comprising the following steps of:
(1) cement-stabilized gravel base course batching: the particle size proportion of the medium-grade gravel of the cement stabilized gravel base layer is as follows: 19-31.5 mm, 9.5-19 mm, 4.75-9.5 mm, 0-4.75 mm =20%, 32%, 22%, 26%;
the cement stabilized gravel base layer comprises the following components in percentage by weight: the graded gravel comprises cement and basalt fiber =100:4.5: 3; maximum dry density 2.506g/cm3The water content is 4.4 percent, and the consumption of EDTA is 15.1 ml;
(2) paving a cement-stabilized gravel base layer: the method comprises one-time full-thickness forming and paving, or two-time single-layer steel mesh paving;
the one-time full-thickness forming and paving is realized by using an anti-segregation middle and large paver Power-DT1900 for one-time forming of 34cm full thickness and 12.35m full width;
the two-time single-layer steel mesh spreading is that a first layer of spreading layer with the full thickness of 17cm and the full width of 12.35m is firstly realized by using an anti-segregation middle and large spreading machine Power-DT1900, a reinforcing mesh with 20 multiplied by 20cm grids formed by reinforcing steel bars with the diameter of 5mm in a horizontal and vertical distribution mode at intervals is arranged on the first layer of spreading layer, and then a second layer of spreading layer with the full thickness of 17cm and the full width of 12.35m is formed on the reinforcing mesh by using the anti-segregation middle and large spreading machine Power-DT 1900;
(3) rolling of cement stabilized gravel base layer: once the paving is finished, immediately carrying out rolling compaction on a cement stabilizing gravel base layer, or ensuring that the paving in front is finished and the rolling compaction is carried out next to the paving in front;
initial pressure stage: firstly, carrying out static pressure half time by using an HD130 double-steel-wheel road roller, wherein the rolling speed is 1.5-1.7 km/h, after ensuring the flatness, directly carrying out forced vibration 0.5 time by using a Yz36 single-steel-wheel road roller and kneading 0.5 time by using an YL37 rubber-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h;
and (3) a repressing stage: strongly vibrating by using a Yz36 single steel wheel road roller and kneading and pressing by using an YL37 rubber wheel road roller, wherein the rolling speed is 2.0-2.5 km/h to form combined circular rolling; the cement stabilized gravel base layer which can be segmented through initial pressing is subjected to combined and circulating rolling for 6 times, so that the compaction degree is ensured;
and (3) final pressure stage: carrying out static pressure 4 times by using an HD130 double-steel-wheel road roller, wherein the rolling speed is 2.0-2.5 km/h, and carrying out static pressure surface rolling;
(4) cement stabilized gravel base course curing: once rolling is completed, curing of the cement stabilization gravel base layer is immediately carried out, or construction that curing is carried out immediately after rolling is completed in the front is guaranteed; after the cement stabilized gravel base layer is rolled, spraying water is sprayed on the surface of the cement stabilized gravel base layer by using a sprinkler, and the water spraying amount is 8-10 liters/m2Then, paving a curing film on the surface of the cement stabilizing gravel base layer, covering geotextile on the curing film, pressing an environment-friendly sand bag on the geotextile at intervals, stacking natural gravel on the geotextile and the film on two sides of the base layer, completing the sealing and fixing of the curing film and the geotextile, and removing the curing film and the geotextile after the curing period is 5-7 days;
(5) testing and detecting a cement stabilized gravel base layer: and carrying out compaction degree detection on the cement stabilization gravel base layer, and processing the points which are not detected to be qualified until the cement stabilization gravel base layer is qualified.
2. The method of claim 1, wherein: the basalt fiber is 10-14 mm in fiber length and 23-37 um in diameter.
3. The method of claim 1, wherein: the ratio of 0.075mm particles in the graded grit is less than 5%.
4. The method of claim 1, wherein: the paving time and the rolling time of the cement stabilization gravel base layer are less than 10 minutes.
5. The method of claim 1, wherein: the time for completing rolling and watering the cement stabilization gravel base course for curing is less than 10 minutes.
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| CN112195704A (en) * | 2020-09-27 | 2021-01-08 | 中交路桥建设有限公司 | Construction method of dense-skeleton type water-stable base layer in Gobi desert region |
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| 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 |
| CN114673056A (en) * | 2022-03-03 | 2022-06-28 | 宁夏交通建设股份有限公司 | Cement-stabilized internal curing base layer for desert highway and construction method |
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