CN114182592A - Construction method of covering soil of water-stable base layer - Google Patents
Construction method of covering soil of water-stable base layer Download PDFInfo
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- CN114182592A CN114182592A CN202111621163.8A CN202111621163A CN114182592A CN 114182592 A CN114182592 A CN 114182592A CN 202111621163 A CN202111621163 A CN 202111621163A CN 114182592 A CN114182592 A CN 114182592A
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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 relates to the technical field of construction of a water-stable base layer of a pavement, in particular to a construction method of covering soil of the water-stable base layer. The method changes the construction of the soil shoulder with the water stabilization layer into the construction of the water stabilization layer after the earthwork is firstly paved and rolled, thoroughly changes the construction mode that the soil shoulder is firstly constructed and then constructed in the process of erecting the water stabilization layer in the prior conventional scheme, can greatly improve the work efficiency by changing the process technical method, reduces the cost generated by erecting and dismantling the template, and can also effectively improve the rolling effect of the compaction degree of the soil shoulder.
Description
Technical Field
The invention relates to the field of construction of soil shoulders of a cement stabilized base course of a road surface, in particular to a construction method of covering soil of the cement stabilized base course.
Background
The construction method of the water stable layer of the highway engineering is mainly controlled by adopting a method of constructing the water stable layer by erecting a template and then constructing a soil shoulder, and the process is characterized in that the structure pre-settling amount of the water stable layer is calculated by data statistics of a test section, the rolling of the edge of the template can meet the rolling requirement of the compaction degree, and the soil shoulder compacting method has related requirements in a design drawing. The traditional construction mode has the following defects: firstly, the compaction degree of rolling at the position of 20-30cm of the edge of the template is difficult to ensure to be consistent with other positions; secondly, a plurality of expenses are generated by supporting and disassembling the template, so that the construction cost is greatly increased; thirdly, constructing the covering soil after the construction of water stability, wherein the compactness of the covering soil is difficult to guarantee; fourthly, the post-construction edge covering soil is easy to cause the pollution of the road surface.
Disclosure of Invention
The invention aims to solve the problems of the construction method of the cement stabilized bed soil shoulder in the prior art and provides a construction method of the covering soil of the cement stabilized base course.
The technical scheme adopted by the invention for realizing the purpose is as follows: a construction method of covering soil of a water-stable base layer is characterized by comprising the following steps:
s1, calculating the pre-settling amount
The construction test section will be constructed earlier before the construction of water stabilization layer, calculates loose coefficient and preliminary sedimentation volume according to the test section, and the data that is closest to actual construction will be come out according to the fitting of different loose thickness to the preliminary sedimentation volume: calculating the determined value of the coefficient of looseness K according to the calculation in the sampleThe loose paving thickness H of each lofting point of a water-stable layer to be paved on the layer is selected according to the interval of the H value, and the numerical value H of the 95 percent confidence interval probability is taken0.95The height obtained by subtracting the difference between the design elevation and the ground elevation at the point is H0.95-（H0.95S-H0.95D）=HMThen H isMThe pre-settlement amount of the road section to be paved;
s2, calculating height of soil shoulder
Measuring the ground elevation of a lower bearing layer at a section to be constructed, and calculating the height of the shoulder of the soil road according to the designed elevation of the water stability of the layer and the calculated pre-settlement amount: the height of the soil shoulder is the designed elevation of the point and the pre-settlement HMThe top surface elevation of the loose paving thickness is parallel to the design elevation and is the same as the virtual paving height of the section of the water-to-be-paved stable layer;
s3, lofting, unloading and rolling of soil shoulder
Setting out 1 pile position at a longitudinal interval of 10 meters; according to the pre-settlement amount, calculating the thickness of the soil shoulder: the elevation of the shaped soil shoulder is the designed elevation plus the pre-settlement amount, and the top elevation of the soil shoulder is ensured to be equal to the top elevation of the loose top of the water-stable layer after rolling and shaping; according to the calculated pre-settling quantity HMThe height of the shoulder of the unearthed road can be obtained because the shoulder of the unearthed road needs to be subjected to primary pressing and shaping, and the width of the primary pressing is set as B2Height of H1After rolling, trimming and shaping to a width B1Height of H1The initial compaction needs to be determined according to the rolling test section, i.e. B2The requirements of trimming and secondary shaping earthwork amount can be met after the loose earthwork is rolled within the range of the initial pressing width;
s4, re-lofting the soil shoulder, and trimming and shaping the rolled soil shoulder.
According to the construction progress requirement of the water stabilization layer, calculating the pile number loose height of the road where the soil shoulder is located according to the calculated pre-settlement amount of the whole construction section, setting out the construction elevation of the soil shoulder, trimming and shaping the soil shoulder, synchronously rolling with the soil shoulder after the water stabilization layer is constructed, and taking the soil shoulder as a template for the water stabilization layer construction.
The pre-settling amount is the pre-settling amount of the compacted thickness within the range of +/-2 cm of the water-stable design thickness.
And in the step S4, according to the construction requirement of the water stabilization layer, after the pavement shoulder is rolled, lofting inner and outer pile lines according to the layered section of the designed pavement shoulder at an interval of 10m, trimming and shaping the inner edge line, controlling the outer edge line by using the pavement shoulder pile, and enabling the top surface elevation to be consistent with the top surface elevation of the pre-settlement amount of the pre-paved water stabilization layer.
The method adopts a mode of constructing the soil covering of the cement stabilized base layer and then constructing the cement stabilized layer, can ensure that the construction of the soil shoulder of the cement stabilized layer is controlled, reduces the whole construction cost and improves the rolling quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the taping soil paving and rolling width control of the cement stabilized base layer;
in the figure: 1-initial pressure edge covering soil lofting width inner side pile steel rod position, 2-edge covering soil lofting road shoulder pile steel rod position, B1-design width of edge covering soil, B2-initial loose paving width of edge covering soil, and H1-water stabilization layer loose paving thickness.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be 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.
Examples
Taking an implemented expressway project as an example, the design width of the layer of the covering soil is 75cm, the water-stable layer loose paving thickness H1 is 18cm of the layer thickness plus 4.5cm of the pre-settlement amount, the total thickness is 22.5cm, the earthwork initial compaction loose paving coefficient is 1.35, the initial loose paving width B2 of the covering soil is approximately equal to B1/1.35 through inverse calculation, and the specific coefficient is determined through experiments according to the soil quality of the covering soil.
FIG. 1 is a flow chart of a construction method of the covering soil of the cement stabilized base layer in an embodiment, and the method for paving the covering soil of the road shoulder firstly and using the compacted and shaped covering soil as a soil template to construct the cement stabilized layer of the road surface is adopted, so that compared with the original method, the construction quality of the road shoulder soil is ensured, the construction cost is reduced, and the integral appearance after completion is greatly improved. As shown in FIG. 1, the construction method of the covering soil for the water-stable base course comprises the following steps S1-S3.
S1, calculating the pre-settling amount
The construction test section will be constructed earlier before the construction of water stabilization layer, calculates loose coefficient and preliminary sedimentation volume according to the test section, and the data that is closest to actual construction will be come out according to the fitting of different loose thickness to the preliminary sedimentation volume: according to the determined loose coefficient K value calculated in the sample, calculating the loose thickness H of each sample point of the layer to be paved with the water-stable layer, and according to the interval of the H value, taking the value H of the 95% confidence interval probability0.95The height obtained by subtracting the difference between the design elevation and the ground elevation at the point is H0.95-（H0.95S-H0.95D）=HMThen H isMThe pre-settlement amount of the road section to be paved;
s2, calculating height of soil shoulder
Measuring the ground elevation of a lower bearing layer at a section to be constructed, and calculating the height of the shoulder of the soil road according to the designed elevation of the water stability of the layer and the calculated pre-settlement amount: the height of the soil shoulder is the designed elevation of the point and the pre-settlement HMThe top surface elevation of the loose paving thickness is parallel to the design elevation and is the same as the virtual paving height of the section of the water-to-be-paved stable layer;
s3, lofting, unloading and rolling of soil shoulder
Setting out 1 pile position at a longitudinal interval of 10 meters; according to the pre-settlement amount, calculating the thickness of the soil shoulder: the elevation of the shaped soil shoulder is the designed elevation plus the pre-settlement amount, and the elevation is ensured after rolling shapingThe top surface elevation of the soil shoulder is equal to the loose top surface elevation of the water-stable layer at the point; according to the calculated pre-settling quantity HMThe height of the shoulder of the unearthed road can be obtained because the shoulder of the unearthed road needs to be subjected to primary pressing and shaping, and the width of the primary pressing is set as B2Height of H1After rolling, trimming and shaping to a width B1Height of H1The initial compaction needs to be determined according to the rolling test section, i.e. B2The requirements of trimming and secondary shaping earthwork amount can be met after the loose earthwork is rolled within the range of the initial pressing width;
s4, re-lofting the soil shoulder, and trimming and shaping the rolled soil shoulder.
According to the construction progress requirement of the water stabilization layer, calculating the pile number loose height of the road where the soil shoulder is located according to the calculated pre-settlement amount of the whole construction section, setting out the construction elevation of the soil shoulder, trimming and shaping the soil shoulder, synchronously rolling with the soil shoulder after the water stabilization layer is constructed, and taking the soil shoulder as a template for the water stabilization layer construction.
The pre-settling amount is the pre-settling amount of the compacted thickness within the range of +/-2 cm of the water-stable design thickness.
And in the step S4, according to the construction requirement of the water stabilization layer, after the pavement shoulder is rolled, lofting inner and outer pile lines according to the layered section of the designed pavement shoulder at an interval of 10m, trimming and shaping the inner edge line, controlling the outer edge line by using the pavement shoulder pile, and enabling the top surface elevation to be consistent with the top surface elevation of the pre-settlement amount of the pre-paved water stabilization layer.
Claims (3)
1. A construction method of covering soil of a water-stable base layer is characterized by comprising the following steps:
s1, calculating the pre-settling amount
The construction test section will be constructed earlier before the construction of water stabilization layer, calculates loose coefficient and preliminary sedimentation volume according to the test section, and the data that is closest to actual construction will be come out according to the fitting of different loose thickness to the preliminary sedimentation volume: according to the determined loose coefficient K value calculated in the sample, calculating the loose thickness H of each sample point of the layer to be paved with the water-stable layer, and according to the interval of the H value, taking the value H of the 95% confidence interval probability0.95The height value of (1) minus the design height and the ground height of the pointHeight obtained by the path difference value, i.e. H0.95-（H0.95S-H0.95D）=HMThen H isMThe pre-settlement amount of the road section to be paved;
s2, calculating height of soil shoulder
Measuring the ground elevation of a lower bearing layer at a section to be constructed, and calculating the height of the shoulder of the soil road according to the designed elevation of the water stability of the layer and the calculated pre-settlement amount: the height of the soil shoulder is the designed elevation of the point and the pre-settlement HMThe top surface elevation of the loose paving thickness is parallel to the design elevation and is the same as the virtual paving height of the section of the water-to-be-paved stable layer;
s3, lofting, unloading and rolling of soil shoulder
Setting out 1 pile position at a longitudinal interval of 10 meters; according to the pre-settlement amount, calculating the thickness of the soil shoulder: the elevation of the shaped soil shoulder is the designed elevation plus the pre-settlement amount, and the top elevation of the soil shoulder is ensured to be equal to the top elevation of the loose top of the water-stable layer after rolling and shaping; according to the calculated pre-settling quantity HMThe height of the shoulder of the unearthed road can be obtained because the shoulder of the unearthed road needs to be subjected to primary pressing and shaping, and the width of the primary pressing is set as B2Height of H1After rolling, trimming and shaping to a width B1Height of H1The initial compaction needs to be determined according to the rolling test section, i.e. B2The requirements of trimming and secondary shaping earthwork amount can be met after the loose earthwork is rolled within the range of the initial pressing width;
s4, re-lofting the road shoulder, and trimming and shaping the rolled road shoulder
According to the construction progress requirement of the water stabilization layer, calculating the pile number loose height of the road where the soil shoulder is located according to the calculated pre-settlement amount of the whole construction section, setting out the construction elevation of the soil shoulder, trimming and shaping the soil shoulder, synchronously rolling with the soil shoulder after the water stabilization layer is constructed, and taking the soil shoulder as a template for the water stabilization layer construction.
2. The method as claimed in claim 1, wherein the pre-settling amount is a pre-settling amount in which the compacted thickness is within ± 2cm of the design thickness of the water-stable foundation.
3. The bordure soil construction method for the cement stabilized base layer according to claim 1, wherein in the step S4, according to the construction requirement of the cement stabilized layer, after the rolling of the road shoulder is completed, the inner and outer pile lines are set out again according to the layered section of the designed road shoulder, the interval is 10m, the inner side line is trimmed and shaped, the outer side line is controlled by the road shoulder pile, and the top elevation is consistent with the top elevation of the pre-settlement amount of the pre-paved cement stabilized layer.
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