CN114481730A - Construction method of full-thickness type road subgrade connecting layer structure - Google Patents
Construction method of full-thickness type road subgrade connecting layer structure 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
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
- E01C1/002—Design or lay-out of roads, e.g. street systems, cross-sections ; Design for noise abatement, e.g. sunken road
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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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- 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/142—Mixtures or their components, e.g. aggregate
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/30—Coherent pavings made in situ made of road-metal and binders of road-metal and other binders, e.g. synthetic material, i.e. resin
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method of a full-thickness type road subgrade connecting layer structure, and belongs to the field of road engineering. The method comprises the following steps: s1, laying a geogrid net on the top surface of a roadbed, and hammering bottom protrusions on the geogrid net into the roadbed; s2, spreading single-stage prepared broken stones, and then rolling until the broken stones are embedded into soil 1/3-2/3; s3, spraying cement-water glass double-liquid slurry; and S4, spreading penetrating layer oil. Compared with the prior art, the construction method of the full-thickness type roadbed connecting layer structure forms a rough cross section between the inorganic binder stable base layer and the asphalt surface layer, and uses the single-graded broken stone and the porous geogrid net to form a connecting layer with a stable structure, so that the interlocking effect between two structural layers is enhanced, the stable interlayer connection is formed, and the overall stability of the pavement can be greatly improved.
Description
Technical Field
The invention relates to the field of road pavement, and particularly provides a construction method of a full-thickness type road subgrade connecting layer structure.
Background
In the current road engineering construction of China, sandstone is mostly mined as a road base material. In the base course, it is usually used as graded crushed stone and cement stabilized crushed stone. The strength of the cement stabilized macadam mainly depends on the embedding, squeezing and locking principles among the macadams, and meanwhile, enough mortar volume is used for filling gaps of the aggregate, the initial strength of the cement stabilized macadam is high, and the cement stabilized macadam is quickly formed into a plate body along with the increase of the strength along with the age, so that the cement stabilized macadam has high strength, good impermeability and good freezing resistance; the graded broken stone is a mixture composed of aggregates with different sizes and grades, and the graded broken stone has good water permeability, diffusion stress and bearing transition effects, can enhance the structural strength of the pavement, and has the waterproof and drainage functions of the pavement structure.
Sandstone resources are materials which have the largest construction amount, cannot be replaced and are indispensable for various infrastructures such as buildings, roads, bridges, high-speed rails, water conservancy, hydropower, nuclear power and the like. It is not only the current mineral resource with the maximum production and consumption in China. At present, the annual output and sales of the sandstone aggregate in China reach 200 hundred million tons, which accounts for 1/2 of the annual output and sales total amount of the sandstone aggregate in the world. Along with the convergence of environmental protection policies, the sandstone aggregate industry is becoming the focus of social attention more and more. On one hand, the open-pit mine is closed, the sandstone aggregate is in short supply, the sandstone aggregate price is soaring, and the sandstone in each place is urgent, so that the local construction and the economic development are severely restricted; on the other hand, illegal sand mining, green mine construction, sand transportation and the like are closely concerned by local and even central departments, and the social attention of the sand industry is continuously promoted.
The increasing tension of sandstone resources forces us to consider the application of other pavement structures. The soil is a resource which is abundant on the earth, and if the soil resource can be effectively used for engineering construction, the method is beneficial to saving the cost and protecting the environment. Therefore, the full-thickness pavement structure is inoculated, the arrangement of the broken stone base layer is removed from the brand-new pavement structure, and the inorganic binder is adopted to stabilize the base layer for replacement. The inorganic binder is cement, lime, industrial waste residue and other materials. Inorganic binder is mixed in soil, and after the mixture obtained by mixing is compacted and cured, the material of which the compressive strength meets the specified requirements is called inorganic binder stable mixture. The inorganic binder stable material belongs to a semi-rigid material, the strength of the material is increased along with the increase of the age, and the material has certain rigidity, good stability and good freezing resistance. After the inorganic binder stabilized base course is paved, an asphalt surface course is directly arranged on the base course. Through a large amount of engineering applications, the connection between the inorganic binder stable base layer and the asphalt surface layer is unstable, and crushed stones in the asphalt surface layer cannot be well embedded and locked on the inorganic binder stable base layer, so that the slippage of the asphalt mixture is easily caused, the overall stability of the pavement is weakened, and the occurrence of pavement diseases is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a construction method of a full-thickness type road subgrade connecting layer structure capable of remarkably improving the interlayer connection performance.
The technical scheme adopted by the invention for solving the technical problems is as follows: the construction method of the full-thickness type road subgrade connecting layer structure comprises the following steps:
s1, before carrying out the last cement soil rolling on the top of the roadbed, laying a geogrid net on the top surface of the roadbed, and then hammering bottom protrusions on the geogrid net into the roadbed;
s2, after the geogrid net is laid, spreading single-stage gravel, and then rolling until the gravel is embedded into soil at 1/3-2/3;
s3, after the single-stage matching crushed stone is rolled, spraying cement-water glass double-slurry body, wherein the cement-water glass double-slurry body consists of cement slurry, water glass and a retarder;
and S4, after the construction of the cement-water glass double-liquid slurry is finished, spreading penetrating layer oil.
The construction method can form a rough cross section between the inorganic binder stable base course and the asphalt surface course, and form a connecting layer with a stable structure by using the single-grade crushed stone and the multi-hollow geogrid net, so that the interlocking effect between the two structural layers is enhanced, and the stable interlayer connection is formed, thereby achieving the effect of improving the overall stability of the pavement.
Preferably, the geogrid net is a steel-plastic grid net, and conical bulges are processed on the upper surface and the lower surface of the steel-plastic grid net.
Preferably, the geogrid net is composed of transverse ribs, longitudinal ribs, inclined ribs and conical bulges, the conical bulges are arranged at the intersection of the transverse ribs and the longitudinal ribs, and the inclined ribs are arranged between the conical bulges at the diagonal positions.
Preferably, the thickness of the transverse ribs and the longitudinal ribs is 4-6 mm, the width of the transverse ribs and the width of the longitudinal ribs are 8-12 mm, and the distance between every two adjacent transverse ribs and between every two adjacent longitudinal ribs is 8-12 cm; the thickness of the inclined ribs is 2-4 mm, and the width of the inclined ribs is 4-8 mm; the diameter of the bottom of the conical bulge is 1.5-2.5 cm, and the height is 1.5-2.5 cm.
Preferably, each geogrid net is laid in a direction perpendicular to the travelling direction, the width of each geogrid net is 0.5-3 m, the length of each geogrid net is based on the width of the roadbed, and the overlapping length of each geogrid net is 10-30 cm. After arrangement is finished, the raised parts of the geogrid nets are hammered into a roadbed by a small hammer, and the geogrid nets are fixed by U-shaped steel bars every 40-60cm to prevent middle protrusion.
Preferably, the single-grade crushed stone is crushed stone with the particle size of 10-20 mm, and the grading range is that stones with various particle sizes pass through the sieve mesh percentage of standard sizes: 26.5mm, 100%; 19mm, 90% -100%; 16mm, 70% -80%; 9.5mm, 0-15%; 4.75mm, 0-5%. The single-layer broken stone coverage rate is not less than 90%, and the spreading amount is 50-60 m3/1000m2。
After the arrangement of the broken stones and the geogrid net is finished, a light road roller can be adopted for rolling for 2-3 times, preferably a road roller with 60-80 KN.
Preferably, the water-cement ratio of the cement paste in the step S4 is 1 (0.8-1.2); the baume degree of the water glass is 18-22 Be, the modulus is 1.8-2.2, and the volume ratio of the water glass to the cement paste is 1 (1.2-2); the retarder is selected from disodium hydrogen phosphate, and the mass of the retarder is 1 to 3 percent of the cement-water glass double-liquid slurry body; the spreading amount of the cement-water glass double-liquid slurry is 1.5 to 2L/m2The cured thickness is substantially the thickness of a single layer of crushed stone.
Preferably, the prime coat oil is emulsified asphalt with the asphalt content of not less than 50%, and the spreading amount is 1.0-1.5L/m2。
Under normal conditions, the two-liquid slurry body can be solidified for about 10 minutes, and then the penetrating layer oil can be sprayed; the rolling of vehicles is forbidden within 12 hours after the permeable layer oil is completely sprayed, so that the pollution and damage of the road surface are avoided; after 12h, the asphalt pavement can be started.
Compared with the prior art, the construction method of the full-thickness type road subgrade connecting layer structure has the following outstanding beneficial effects:
firstly, starting construction of a connecting layer before the last rolling of the cement soil of the roadbed, so that broken stones can be better embedded into the cement soil to achieve the effect of interlayer interlocking;
and (II) the steel-plastic geogrid net with the bulges and the ribs is adopted, so that the steel-plastic geogrid net has excellent drawing performance and friction resistance, and has a good reinforcement effect to enhance the overall strength and deformation resistance of the connecting layer. The internal stable triangular structure has good tensile strength in the transverse direction and the longitudinal direction, and crushed stones with specific grading can be embedded into internal gaps to form a stable three-dimensional structure by combining with the crushed stones, so that the interlayer interlocking capability of the connecting layer is further enhanced;
filling cement-water glass double-liquid slurry into a gap between the geogrid net and the gravel, enhancing the connection between the geogrid net and the gravel layer, accelerating the setting time of cement, forming a stable whole and shortening the construction period;
and (IV) secondary filling of partial permeable layer oil to enable the broken stone and the geogrid net to form a firm whole and be bonded with the lower layer of cement soil, and meanwhile, the broken stone and the geogrid net can generate better bonding effect with the asphalt layer during upper layer construction.
And fifthly, the bonding capability of the inorganic mixture base layer and the surface layer can be enhanced, the anti-sliding capability and stability of the pavement can be improved, the strength and service life of the pavement can be improved, and the operation and maintenance cost of the pavement can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a full-thickness pavement of an embodiment;
FIG. 2 is an enlarged view of the road surface structure shown in FIG. 1 at A;
fig. 3 is a schematic view of the geogrid mesh structure according to the embodiment;
fig. 4 is a cross-sectional view of geogrid mesh B-B shown in fig. 3.
Description of reference numerals:
1. the embankment comprises an embankment body, 2, a roadbed, 3, a connecting layer, 31, a geogrid net, 311, transverse ribs, 312, longitudinal ribs, 313, inclined ribs, 314, conical protrusions, 32, single-stage gravel distribution, 33, a double-liquid slurry layer, 34, a permeable oil layer, 4 and an asphalt surface layer.
Detailed Description
The invention is further described with reference to the following figures and specific examples, which are not intended to be limiting.
Unless otherwise specified, the contents of the respective components used below are mass% contents.
Example (b):
a filling roadbed with the length of 200m is selected to construct a full-thickness type durable asphalt pavement, the roadbed width is 34.5m, and the construction method is used for constructing the roadbed connecting layer of the pavement.
As shown in fig. 1 and 2, the full-thickness durable asphalt pavement is composed of a embankment 1, a roadbed 2, a connecting layer 3 and an asphalt surface layer 4 which are laid from bottom to top. The connecting layer 3 consists of a geogrid net 31, single-stage gravel 32, a double-liquid slurry layer 33 and a permeable oil layer 34.
The filling materials of the roadbed part are mainly divided into plain soil, 4% of cement soil and 6% of cement soil. The embankment 1 is plain soil, 4% cement soil with the thickness of 60cm is arranged at the lower part of the roadbed 2, 6% cement soil with the thickness of 60cm is arranged at the upper part of the roadbed 2, and the plain soil is obtained through preliminary investigation and is silty clay.
And (II) covering the geogrid net 31 before the cement soil on the upper part of the roadbed 2 is rolled to the last time.
As shown in fig. 3 and 4, the transverse ribs 311 and the longitudinal ribs 312 of the geogrid net 31 have a thickness of 5mm and a width of 10mm, and the distance between two adjacent transverse ribs 311 and two adjacent longitudinal ribs 312 is 10 cm; the inclined ribs 313 are 3mm thick and 5mm wide; the conical protrusion 314 is located at the intersection of the transverse rib 311 and the longitudinal rib 312, the diameter of the bottom of the conical protrusion is 2cm, the height of the conical protrusion is 2cm, and the top surface of the conical protrusion is an arc surface.
Each geogrid net 31 is laid perpendicularly to the travelling direction, the width is 1m, the length is 34.5m, and the overlapping length of each geogrid is 20 cm. After arrangement is finished, the raised parts of the geogrid nets are hammered into a roadbed by small hammers, and the geogrid nets are fixed by U-shaped steel bars every 50cm to prevent middle projection.
And (III) after the geogrid net 31 is laid, starting to distribute the graded broken stones 32. The single stageThe crushed stone is 10-20 mm in particle size, and the tested single-stage crushed stone has the following standard sieve mesh percentage of the stones with each particle size: 26.5mm, 100%; 19mm, 92%; 16mm, 73%; 9.5mm, 11%; 4.75mm, 4%, by 55m3/1000m2The amount of the dispersion is dispersed. When the gravels are scattered, the gravels are embedded into the gaps in the middle of the geogrid net as much as possible. And observing the spreading uniformity of the crushed stones on site, manually leveling the overlapped crushed stones, then carrying out static pressure for 3 times by adopting a light road roller with 80KN, controlling the speed to be 1.5-1.7Km/h, observing that the crushed stones are 1/3 embedded into the cement soil after rolling is finished, and having a better rolling effect.
And (IV) after the single-stage matching crushed stone 32 is rolled, spraying cement-water glass double-liquid slurry to form a double-liquid slurry layer 33. Selecting C30 ordinary portland cement as cement, wherein the water cement ratio is 1: 1; the baume degree of the water glass is 20Be, the modulus is controlled to Be about 2.0, and the volume ratio of the water glass to the cement paste is 1: 1.5; the retarder is selected from disodium hydrogen phosphate, and the mass of the retarder is 2% of that of the cement-water glass double-liquid slurry. The spreading amount is 2L/m2。
And (V) spreading the permeable oil to form a permeable oil layer 34. The prime coat oil is emulsified asphalt with asphalt content not less than 50%, and the spreading amount is 1.5L/m2。
Comparative example:
and selecting a filling roadbed with the length of 200m to construct a full-thickness type durable asphalt pavement, wherein the roadbed width is 34.5 m. The difference from the embodiment 1 is that the road bed top is constructed according to the conventional construction without a connecting layer.
Detection example:
after the construction, the deflection detection is carried out on the road bed tops of the examples and the comparative examples by using a drop weight deflectometer, and the deflection representative value of the road bed top of the comparative example is 58.37(0.01mm), and the deflection representative value of the top of the connecting layer of the examples is 43.21(0.01 mm). The overall stability and the deformation resistance of the roadbed after the connecting layer is arranged are superior to those of the prior art.
Meanwhile, in order to verify the improvement effect of the connecting layer on the overall stability and the deformation resistance of the pavement, after the top of the bed of the embodiment and the comparative example is constructed, a conventional asphalt surface layer, namely 8cm AC-25C +6cm AC-20C +4cm SMA-13 is paved, after the construction is finished, a drop weight deflectometer is adopted to detect the deflection of the asphalt pavement of the embodiment and the comparative example, and the deflection representative value of the top of the comparative example is 25.78(0.01mm) and the deflection representative value of the top of the connecting layer of the embodiment is 14.36(0.01 mm). The stability and the deformation resistance of the roadbed and the pavement are better than those of the prior art after the connecting layer is arranged.
The above-described embodiment is only one of the preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (7)
1. The construction method of the full-thickness type road subgrade connecting layer structure is characterized by comprising the following steps:
s1, before carrying out the last cement soil rolling on the top of the roadbed, laying a geogrid net on the top surface of the roadbed, and then hammering bottom protrusions on the geogrid net into the roadbed;
s2, after the geogrid net is laid, spreading single-stage gravel, and then rolling until the gravel is embedded into soil at 1/3-2/3;
s3, after the single-stage matching crushed stone is rolled, spraying cement-water glass double-slurry body, wherein the cement-water glass double-slurry body consists of cement slurry, water glass and a retarder;
and S4, after the construction of the cement-water glass double-liquid slurry is finished, spreading penetrating layer oil.
2. The construction method of the full-thickness type roadbed coupling layer structure as claimed in claim 1, wherein the geogrid net is a steel-plastic grid net, and conical protrusions are formed on the upper surface and the lower surface of the steel-plastic grid net.
3. The construction method of a full-thickness roadbed coupling layer structure as claimed in claim 2, wherein the geogrid net is composed of transverse ribs, longitudinal ribs, inclined ribs and conical protrusions, the conical protrusions are arranged at the intersections of the transverse ribs and the longitudinal ribs, and the inclined ribs are arranged between the conical protrusions at the diagonal positions.
4. The construction method of the full-thickness type roadbed tie layer structure of the road according to claim 3, wherein the thickness of the transverse ribs and the longitudinal ribs is 4-6 mm, the width of the transverse ribs and the longitudinal ribs is 8-12 mm, and the distance between every two adjacent transverse ribs and between every two adjacent longitudinal ribs is 8-12 cm; the thickness of the inclined ribs is 2-4 mm, and the width of the inclined ribs is 4-8 mm; the diameter of the bottom of the conical bulge is 1.5-2.5 cm, and the height is 1.5-2.5 cm.
5. The construction method of the full-thickness type roadbed tie layer structure according to claim 1, wherein the single-graded broken stones are broken stones with the grain size of 10-20 mm, and the grading range is that the stone materials with various grain sizes pass through a standard-size sieve mesh percentage: 26.5mm, 100%; 19mm, 90% -100%; 16mm, 70% -80%; 9.5mm, 0-15%; 4.75mm, 0-5%. The single-layer broken stone coverage rate is not less than 90%, and the spreading amount is 50-60 m3/1000m2。
6. The construction method of a full-thickness type roadbed tie layer structure according to claim 1,
the water-cement ratio of the cement paste is 1 (0.8-1.2);
the baume degree of the water glass is 18-22 Be, the modulus is 1.8-2.2, and the volume ratio of the water glass to the cement paste is 1 (1.2-2);
the retarder is selected from disodium hydrogen phosphate, and the mass of the retarder is 1 to 3 percent of the cement-water glass double-liquid slurry body;
the spreading amount of the cement-water glass double-liquid slurry is 1.5 to 2L/m2。
7. The construction method of the full-thickness roadbed tie layer structure of the pavement according to claim 1, wherein the prime coat oil is emulsified asphalt with asphalt content of not less than 50%, and the spreading amount is 1.0-1.5L/m2。
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