CN113882202A - Construction process for improving cement fly ash (CFB) soil roadbed - Google Patents
Construction process for improving cement fly ash (CFB) soil roadbed Download PDFInfo
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- CN113882202A CN113882202A CN202111171306.XA CN202111171306A CN113882202A CN 113882202 A CN113882202 A CN 113882202A CN 202111171306 A CN202111171306 A CN 202111171306A CN 113882202 A CN113882202 A CN 113882202A
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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
- 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
- E01C19/12—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 distributing granular or liquid materials
- E01C19/20—Apparatus for distributing, e.g. spreading, granular or pulverulent materials, e.g. sand, gravel, salt, dry binders
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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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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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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- Road Paving Machines (AREA)
Abstract
The invention relates to a construction process of a CFB fly ash improved soil roadbed, which fills soil in a roadbed with a CBR value which does not meet the design strength requirement, adopts an integrated powder spreading vehicle, adds CFB fly ash through a special loading interface, accurately measures by an electronic metering system, uniformly spreads the CFB fly ash on the surface of prepared roadbed soil, adopts an integrated road mixer to fully stir, roll and maintain, can greatly improve the performance of the soil, improve the bearing capacity, meet the roadbed strength requirement, improve the resource utilization efficiency, and simultaneously can avoid the occupation of waste gas material stacking on the soil and the pollution to the environment.
Description
Technical Field
The invention belongs to the technical field of roadbeds, and particularly relates to a construction process for improving a road bed by CFB fly ash.
Background
The powder collected by dedusting flue gas of a circulating fluidized bed boiler (CFB) in a coal-fired power plant is called circulating fluidized bed boiler fly ash, which is called CFB fly ash for short. The combustion characteristics of the CFB boiler determine that the CFB ash has different physical and chemical properties from the pulverized coal furnace fly ash, and the main differences are as follows: high loss on ignition, high CaO content, and SO3High content, less vitreous body, self-hardening and larger difference, and long-term stacking of CFB fly ash can cause environmental pollution and waste of resources.
With the rapid development of the highway industry in China, the road network in China is enlarged in the past few years. Road traffic and transportation efficiency has also received much attention. However, as the scale increases, problems also accompany it. The main problems are that the road surface cracks and uneven settlement occur due to insufficient roadbed strength when the highway is maintained. The continuous deformation and the lack of rigidity of the foundation and the considerable maintenance cost of the road in the area with severe soil conditions are quite high, and the CBR value of the existing road filling foundation does not meet the design strength requirement and has the defects of low bearing capacity and the like.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a construction process for improving a soil roadbed by CFB fly ash.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction process for improving a cement fly ash soil roadbed by CFB comprises the following steps:
(1) preparing a lower bearing layer: the surface of the lower bearing layer is smooth and solid, and is rolled for 1-2 times by a road roller;
(2) preparing soil and smoldering: wetting the sprinkling surface of the lower bearing layer, stirring and mixing the CFB fly ash and soil, rolling and forming, and spreading uniformly to blank the materials;
(3) leveling and lightly pressing: pressing one side of the spread coating by using a vibratory roller, and finely leveling by using a leveler;
(4) spreading CFB fly ash: uniformly spreading CFB fly ash by adopting an integrated powder spreading vehicle;
(5) mixing: mixing by adopting an integrated road mixer to obtain CFB fly ash improved soil, immersing the CFB fly ash improved soil into a lower bearing layer for 1cm during mixing, sprinkling water to control the water content of the CFB fly ash improved soil, and picking out super-sized particles;
(6) shaping: stabilizing the mixed CFB fly ash improved soil once by using staggered wheels of a road roller 1/2, and leveling by a land leveler;
(7) rolling: rolling by using a light road roller, and keeping the surface of the CFB fly ash improved soil wet in the rolling process;
(8) health preserving: and (5) watering and preserving health.
The invention improves the performance of soil by doping CFB fly ash in the soil, improves the bearing capacity, meets the requirement of roadbed strength, is a treatment measure for the condition that the CBR value of plain soil can not meet the requirement of design strength, adopts a cloth bag dust removal device in the spreading process of the CFB fly ash, can avoid dust raising, and ensures that the whole construction process is environment-friendly and pollution-free.
Further, in the rolling process in the step (1), if the soil is over-dried and the surface layer is loose, proper water spraying treatment is carried out.
Further, the CFB fly ash accounts for 8-20% of the total mass of the CFB fly ash and the soil in the step (2).
Further, in the step (2), the uniformly spread water content is 2-3%, and the material-sealing time is 12-16 h.
Further, the material sealing time is 14 h. Through a large number of experiments, the inventor finds that the dry density of the CFB fly ash improved soil is larger within 12-16h of material sealing time, particularly the dry density of the CFB fly ash is the largest when the material sealing time is 14h, and therefore, the material sealing time is selected to be 12-16 h.
Further, the spraying mass of the CFB fly ash in the step (4) is 28-34kg/m2。
Further, the spraying mass of the CFB fly ash in the step (4) is 31kg/m2。
The integrated powder spreading vehicle has the following characteristics:
(1) the feeding mode is provided with a special feeding interface;
(2) the full-automatic control is adopted, and the spreading amount per square meter is not changed along with the change of the vehicle speed;
(3) a cloth bag dust removal device is adopted, so that the environment is pollution-free;
(4) the spreading shade is adopted, so that dust can be prevented from flying in the spreading process;
(5) the metering system can directly input the specific parameters of powder spreading;
(6) the main construction parameters can be displayed at any time, and the construction parameters can be recorded and stored.
Further, the water content of the CFB fly ash improved soil in the step (5) is 1-2%.
Further, in the step (5), the mixing depth is less than 400mm, and the mixing width is 2200-.
The integrated road mixer has the following characteristics:
(1) the walking and the driving of the mixing rotor are all full hydraulic closed loops.
(2) The running speed and the rotating speed of the mixing rotor are both infinitely variable speeds, the auxiliary systems (steering, mixing rotor lifting and tail gate opening and closing) are all hydraulically operated, and the driving of the mixing rotor is all a full hydraulic closed loop.
(3) The mixing depth is within 400mm, and the mixing width is 2200-2400 mm.
Further, in the step (7), the rolling is performed for 2-3 times by vibration rolling and 1-2 times by static pressure, the speed of the vibration rolling of the road roller is 1.5-1.7km/h, and the speed of the static pressure is 2-2.5 km/h.
Further, the thickness of the CFB fly ash modified soil rolled in the step (7) is 15-30 cm.
The soil in the invention is cohesive soil, but not silty soil, the particle size is less than 100mm, and the soil does not contain turf, household garbage, tree roots, humus and the like.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a construction process of a CFB fly ash improved soil road bed, which fills soil in a road bed with a CBR value which does not meet the design strength requirement, adopts an integrated powder spreading vehicle, adds CFB fly ash through a special loading interface, precisely measures by an electronic measuring system, uniformly spreads the CFB fly ash on the surface of prepared road bed soil, adopts an integrated road mixer to fully stir, roll and maintain, can greatly improve the performance of the soil, improve the bearing capacity, meet the strength requirement of the road bed, improve the resource utilization efficiency, simultaneously can avoid the occupation of waste gas material stacking on the soil and the pollution to the environment, and is matched with compaction parameters determined by a test section in the mixing and spreading processes, so that various detection preparations of the finally constructed road bed meet the standards and meet the technical specifications.
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.
FIG. 1 is a flow chart of the CFB fly ash improved dirt bed construction process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
FIG. 1 shows a flow chart of a CFB fly ash modified dirt bed construction process in the following example.
Example 1
The construction process for improving the smooth soil road by the CFB fly ash comprises the following steps:
(1) preparing a lower bearing layer: leveling and firming the surface of the lower bearing layer, rolling for 1 time by a road roller, and if over-dry soil and loose surface layer are found in the rolling process, carrying out proper water spraying treatment;
(2) preparing soil and smoldering: wetting the sprinkling surface of the lower bearing layer, stirring, mixing and rolling the CFB fly ash and the soil, wherein the CFB fly ash accounts for 8% of the total mass of the CFB fly ash and the soil, uniformly spreading and sealing the material for 12 hours, and the uniformly spread water content is 2-3%;
(3) leveling and lightly pressing: pressing one side of the spread coating by using a vibratory roller, and finely leveling by using a leveler;
(4) spreading CFB fly ash: the CFB fly ash is uniformly spread by adopting an integrated powder spreading vehicle, and the spreading quality of the CFB fly ash is 28kg/m2；
(5) Mixing: mixing by adopting an integrated road mixer to obtain CFB fly ash improved soil, wherein the CFB fly ash improved soil enters a lower bearing layer for 1cm during mixing, the mixing depth is less than 400mm, the mixing width is 2200mm, the water content of the CFB fly ash improved soil is controlled to be 1-2% by water spraying, and meanwhile, super-sized particles are picked out;
(6) shaping: stabilizing the mixed CFB fly ash improved soil once by using staggered wheels of a road roller 1/2, and leveling by a land leveler;
(7) rolling: rolling by using a light road roller, keeping the surface of the CFB fly ash modified soil wet in the rolling process, wherein the rolling is vibration rolling for 2 times, and static pressure for 1 time, the vibration rolling speed of the road roller is 1.5km/h, the static pressure speed is 2km/h, and the thickness of the rolled CFB fly ash modified soil is 15 cm;
(8) health preserving: watering and maintaining, wherein the maintenance period is not less than 7 days, the number of watering every day is determined according to the weather, the surface is kept wet all the time during the whole maintenance period, the surface condition is noticed, and if necessary, a vibratory roller is used for carrying out static pressure.
Example 2
The construction process for improving the smooth soil road by the CFB fly ash comprises the following steps:
(1) preparing a lower bearing layer: the surface of the lower bearing layer is smooth and solid, a road roller is adopted for rolling for 2 times, and in the rolling process, if the soil is over-dry and the surface layer is loose, water is properly sprayed;
(2) preparing soil and smoldering: wetting the sprinkling surface of the lower bearing layer, stirring, mixing and rolling the CFB fly ash and the soil, wherein the CFB fly ash accounts for 14% of the total mass of the CFB fly ash and the soil, spreading the CFB fly ash uniformly for 14h, and the water content of the spread CFB fly ash is 2-3%;
(3) leveling and lightly pressing: pressing one side of the spread coating by using a vibratory roller, and finely leveling by using a leveler;
(4) spreading CFB fly ash: the CFB fly ash is uniformly spread by adopting an integrated powder spreading vehicle, and the spreading quality of the CFB fly ash is 31kg/m2；
(5) Mixing: mixing by adopting an integrated road mixer to obtain CFB fly ash improved soil, wherein the CFB fly ash improved soil enters a lower bearing layer for 1cm during mixing, the mixing depth is less than 400mm, the mixing width is 2300mm, the water content of the CFB fly ash improved soil is controlled to be 1-2% by water spraying, and meanwhile, super-sized particles are picked out;
(6) shaping: stabilizing the mixed CFB fly ash improved soil once by using staggered wheels of a road roller 1/2, and leveling by a land leveler;
(7) rolling: rolling by using a light road roller, keeping the surface of the CFB fly ash modified soil wet in the rolling process, wherein the rolling is vibration rolling for 3 times, and static pressure for 1 time, the vibration rolling speed of the road roller is 1.6km/h, the static pressure speed is 2.25km/h, and the thickness of the rolled CFB fly ash modified soil is 22.5 cm;
(8) health preserving: watering and maintaining, wherein the maintenance period is not less than 7 days, the number of watering every day is determined according to the weather, the surface is kept wet all the time during the whole maintenance period, the surface condition is noticed, and if necessary, a vibratory roller is used for carrying out static pressure.
Example 3
The construction process for improving the smooth soil road by the CFB fly ash comprises the following steps:
(1) preparing a lower bearing layer: leveling and firming the surface of the lower bearing layer, rolling for 1 time by a road roller, and if over-dry soil and loose surface layer are found in the rolling process, carrying out proper water spraying treatment;
(2) preparing soil and smoldering: wetting the sprinkling surface of the lower bearing layer, stirring, mixing and rolling the CFB fly ash and the soil, wherein the CFB fly ash accounts for 20% of the total mass of the CFB fly ash and the soil, spreading the CFB fly ash uniformly for 16h, and the water content of the spread CFB fly ash is 2-3%;
(3) leveling and lightly pressing: pressing one side of the spread coating by using a vibratory roller, and finely leveling by using a leveler;
(4) spreading CFB fly ash: the CFB fly ash is uniformly spread by adopting an integrated powder spreading vehicle, and the spreading quality of the CFB fly ash is 34kg/m2；
(5) Mixing: mixing by adopting an integrated road mixer to obtain CFB fly ash improved soil, wherein the CFB fly ash improved soil enters a lower bearing layer for 1cm during mixing, the mixing depth is less than 400mm, the mixing width is 2400mm, the water content of the CFB fly ash improved soil is controlled to be 1-2% by sprinkling water, and meanwhile, super-sized particles are picked out;
(6) shaping: stabilizing the mixed CFB fly ash improved soil once by using staggered wheels of a road roller 1/2, and leveling by a land leveler;
(7) rolling: rolling by using a light road roller, keeping the surface of the CFB fly ash modified soil wet in the rolling process, wherein the rolling is vibration rolling for 2 times, and static pressure for 2 times, the vibration rolling speed of the road roller is 1.7km/h, the static pressure speed is 2.5km/h, and the thickness of the rolled CFB fly ash modified soil is 30 cm;
(8) health preserving: watering and maintaining, wherein the maintenance period is not less than 7 days, the number of watering every day is determined according to the weather, the surface is kept wet all the time during the whole maintenance period, the surface condition is noticed, and if necessary, a vibratory roller is used for carrying out static pressure.
Test example 1
The same as example 2 except that the material-sealing time was changed, the dry density change of the CFB fly ash-improved soil was examined at different material-sealing times, and the results are shown in Table 1.
TABLE 1
| Serial number | Blank time (h) | Dry density (kg/m)3) |
| 1 | 6 | 1.735 |
| 2 | 10 | 1.759 |
| 3 | 14 | 1.781 |
| 5 | 18 | 1.768 |
As can be seen from the data in Table 1, the difference of the material sealing time has a great influence on the dry density of the CFB fly ash modified soil, and when the material sealing time is 14h, the dry density of the CFB fly ash modified soil is the largest.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A construction process for improving a cement fly ash soil roadbed by CFB is characterized by comprising the following steps:
(1) preparing a lower bearing layer: the surface of the lower bearing layer is smooth and solid, and is rolled for 1-2 times by a road roller;
(2) preparing soil and smoldering: wetting the sprinkling surface of the lower bearing layer, stirring and mixing the CFB fly ash and soil, rolling and forming, and spreading uniformly to blank the materials;
(3) leveling and lightly pressing: pressing one side of the spread coating by using a vibratory roller, and finely leveling by using a leveler;
(4) spreading CFB fly ash: uniformly spreading CFB fly ash by adopting an integrated powder spreading vehicle;
(5) mixing: mixing by adopting an integrated road mixer to obtain CFB fly ash improved soil, immersing the CFB fly ash improved soil into a lower bearing layer for 1cm during mixing, sprinkling water to control the water content of the CFB fly ash improved soil, and picking out super-sized particles;
(6) shaping: stabilizing the mixed CFB fly ash improved soil once by using staggered wheels of a road roller 1/2, and leveling by a land leveler;
(7) rolling: rolling by using a light road roller, and keeping the surface of the CFB fly ash improved soil wet in the rolling process;
(8) health preserving: and (5) watering and preserving health.
2. The process of claim 1, wherein during the rolling step (1), if the soil is over-dried and the surface layer is loose, the soil is treated by spraying water properly.
3. The process of claim 1, wherein the CFB fly ash in step (2) accounts for 8-20% of the total mass of CFB fly ash and soil.
4. The CFB fly ash improved soil roadbed construction process as claimed in claim 1, wherein the water content of the uniformly spread material in step (2) is 2-3%, and the material smoldering time is 12-16 h.
5. A CFB fly ash according to claim 1The construction process of the improved soil road bed is characterized in that the spreading mass of the CFB fly ash in the step (4) is 28-34kg/m2。
6. The CFB fly ash improved soil roadbed construction process of claim 1, wherein the water content of the CFB fly ash improved soil in the step (5) is 1-2%.
7. The CFB fly ash improved soil roadbed construction process as claimed in claim 1, wherein the mixing depth in step (5) is less than 400mm, and the mixing width is 2200-.
8. The construction process of a CFB fly ash improved soil road bed according to claim 1, wherein the rolling in the step (7) is vibration rolling for 2-3 times, static pressure for 1-2 times, the vibration rolling speed of the road roller is 1.5-1.7km/h, and the static pressure speed is 2-2.5 km/h.
9. The process of claim 1, wherein the thickness of the CFB fly ash modified soil rolled in step (7) is 15-30 cm.
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