CN113373749A - Improved construction method for granite residual soil roadbed - Google Patents
Improved construction method for granite residual soil roadbed Download PDFInfo
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- CN113373749A CN113373749A CN202110692905.XA CN202110692905A CN113373749A CN 113373749 A CN113373749 A CN 113373749A CN 202110692905 A CN202110692905 A CN 202110692905A CN 113373749 A CN113373749 A CN 113373749A
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/026—Improving by compacting by rolling with rollers usable only for or specially adapted for soil compaction, e.g. sheepsfoot rollers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
- E02F5/32—Rippers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0045—Composites
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- Agronomy & Crop Science (AREA)
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Abstract
The invention relates to the field of roadbed construction, in particular to a granite residual soil roadbed improvement construction method, which comprises the steps of on-site exploration and measurement by a measurer; cleaning the site; carrying out substrate treatment, namely carrying out rolling treatment on the cleaned site; paving the granite residual soil on the treated substrate, and turning and airing; leveling and compacting, namely leveling the residual soil of the aired granite, and then carrying out static pressure once; drawing squares on the upper surface of granite residual soil, paving cement, lime and dry paper pulp in each square, and stirring the granite residual soil, the cement, the lime and the dry paper pulp after paving; and rolling the stirred materials, and maintaining after rolling, wherein the materials are forbidden to pass through the process. The invention improves the soil property of the granite residual soil by doping cement, lime and dry paper pulp in the granite residual soil, so that the roadbed manufactured by the granite residual soil can meet the design and use requirements.
Description
Technical Field
The invention relates to the field of roadbed construction, in particular to an improved construction method of a granite residual soil roadbed.
Background
The residual granite soil has the characteristics of high natural water content, high liquid limit, loose structure, poor caking property, difficult rolling and forming and the like, so that the compactness and the deflection value of a roadbed cannot meet the design requirements, the filling quality and the construction period of the residual granite soil roadbed are seriously influenced, and the residual granite soil becomes a main obstacle of site construction. At present, scholars at home and abroad develop a large amount of modifying agents, and the modifying agents are mainly used for enhancing the caking property and the strength of the filler by adding cement, lime and the like and improving the tensile strength of the filler by using fibers and the like. These modifiers exhibit good road-use properties in laboratory tests, but are less desirable in practical engineering. The reason is that the construction method of the conventional roadbed is still adopted in the field construction, and the bonding time effect and the ash mixing process control of the modifier are not considered. Therefore, a roadbed filling construction method suitable for granite residual soil is urgently needed.
Disclosure of Invention
The invention aims to provide a method for improving and constructing a granite residual soil roadbed, which aims to solve the problems.
In order to achieve the purpose, the invention provides the following scheme:
a granite residual soil roadbed improvement construction method comprises the following steps:
firstly, surveying on site, wherein a measurer measures the site;
cleaning the site, and removing materials which are not suitable for roads, such as agricultural surface soil, humus soil, tree clusters, tree roots, weeds, sundries, garbage, muck and the like in the construction range;
step three, substrate treatment, namely rolling treatment is carried out on the cleaned site;
step four, distributing soil and airing, namely paving the residual granite soil on the substrate processed in the step three, and turning and airing;
leveling static pressure, namely leveling the residual soil of the granite aired in the fourth step, and performing static pressure once;
step six, drawing grid mixed materials, drawing grids on the upper surface of the granite residual soil subjected to static pressure in the step five, paving cement, lime and dry paper pulp in each grid, and stirring the granite residual soil, the cement, the lime and the dry paper pulp after paving;
and step seven, rolling and maintaining, namely rolling the materials stirred in the step five, maintaining after rolling, and forbidding passing in the period.
Preferably, in the third step, the rolling treatment is performed by using a road roller to perform static pressure, micro vibration and strong vibration for 1 time respectively, and then the road roller is used to perform rolling for 1 time.
Preferably, in the fourth step, the loose paving of the residual granite soil is carried out, the loose paving thickness of the residual granite soil is not more than 30cm, stirring treatment is carried out after the loose paving of the residual granite soil, the maximum soil mass diameter of a soil body is not more than 5cm, and the fifth step is carried out after whether the water content of the residual granite soil is less than 22% or not and whether the water content of the residual granite soil is less than 22% are determined in real time in the airing process.
Preferably, in the fifth step, a grader is used for leveling the granite residual soil, manual leveling is performed on individual uneven positions, and then a road roller is used for carrying out reciprocating static pressure on the granite residual soil once.
Preferably, the grid size in the sixth step is 6 meters long and 5 meters wide, and the calculation formula of the cement, lime and dry pulp is as follows:
mhadding cement, lime and dry pulp into each square；mtThe mass of the granite residual soil in the square grids; a is the length of the square grid, and b is the width of the square grid; h is the residual soil loose paving thickness of the granite, ptThe density of the granite residual soil is obtained;
the mass ratio of the granite residual soil to the cement to the lime to the dry paper pulp is 100:2:1: 0.2.
Preferably, the time for stirring the cement, the lime, the dry pulp and the granite residual soil by using a soil turning machine in the sixth step is not more than 3 hours.
Preferably, the rolling in the seventh step is propelled from two sides to the middle, and the width of the overlapped wheels of the rolling wheel of the road roller is 20-30 cm.
Preferably, the travel speed of the roller does not exceed 3km/h at most.
Preferably, the curing time in the seventh step is not less than 5 days.
The invention has the following technical effects:
according to the invention, the soil turning and airing are carried out on the roadbed which does not meet the requirement, cement, lime and dry paper pulp are added after the soil turning and airing, the cement, the lime and the dry paper pulp are fully mixed, the lime can generate calcium oxide after meeting water, so that the roadbed has certain hardness after construction is finished, and the strength of the whole roadbed is improved by matching with the cement.
Increase dry paper pulp in the work progress, make original road bed tensile strength, possess certain mutual pulling force between the paper pulp fibre after the road bed shaping, make the interaction force have between the granule of the incomplete accumulational soil of granite, reduced the easy problem that disintegrates after the water of incomplete accumulational soil of granite.
The construction method can fully utilize the granite residual soil excavated in the original site, and reduce the amount of earth supplement from the outside, thereby reducing the resource consumption in the construction process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of the construction process of the invention
FIG. 2 is a schematic view of a state structure of an apparatus for carrying out the method of the present invention;
FIG. 3 is a schematic view of a second configuration of a device for carrying out the method of the present invention;
FIG. 4 is a schematic view of the clamping assembly of FIG. 3;
FIG. 5 is a schematic structural view of FIG. 4 with the fixed block removed;
FIG. 6 is a partial cross-sectional view of the clamping assembly.
Wherein, 1, the diesel locomotive; 2. a first connecting rod; 201. inserting a guide sleeve; 3. a hinged lever; 4. a hydraulic cylinder; 5. a soil turning impeller; 6. a second connecting rod; 601. an insertion rod; 8. a clamping assembly; 801. a fixed block; 802. a bayonet lock; 803. rotating the block; 804. rotating the pin; 805. and (7) clamping blocks.
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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, the invention provides a granite residual soil roadbed improvement construction method, which comprises the following steps:
firstly, surveying on site, wherein a measurer measures the site;
cleaning the site, and removing materials which are not suitable for roads, such as agricultural surface soil, humus soil, tree clusters, tree roots, weeds, sundries, garbage, muck and the like in the construction range;
step three, substrate treatment, namely rolling treatment is carried out on the cleaned site;
step four, distributing soil and airing, namely paving the residual granite soil on the substrate processed in the step three, and turning and airing;
leveling static pressure, namely leveling the residual soil of the granite aired in the fourth step, and performing static pressure once;
step six, drawing grid mixed materials, drawing grids on the upper surface of the granite residual soil subjected to static pressure in the step five, paving cement, lime and dry paper pulp in each grid, and stirring the granite residual soil, the cement, the lime and the dry paper pulp after paving;
and step seven, rolling and maintaining, namely rolling the materials stirred in the step five, maintaining after rolling, and forbidding passing in the period.
According to the invention, the soil turning and airing are carried out on the roadbed which does not meet the requirement, cement, lime and dry paper pulp are added after the soil turning and airing, the cement, the lime and the dry paper pulp are fully mixed, the lime can generate calcium oxide after meeting water, so that the roadbed has certain hardness after construction is finished, and the strength of the whole roadbed is improved by matching with the cement.
Increase dry paper pulp in the work progress, make original road bed tensile strength, possess certain mutual pulling force between the paper pulp fibre after the road bed shaping, make the interaction force have between the granule of the incomplete accumulational soil of granite, reduced the easy problem that disintegrates after the water of incomplete accumulational soil of granite.
The construction method can fully utilize the granite residual soil excavated in the original site, and reduce the amount of earth supplement from the outside, thereby reducing the resource consumption in the construction process.
And further optimizing the scheme, wherein in the third step, the rolling treatment is respectively performed for 1 time by using static pressure, micro vibration and strong vibration of the road roller, and then the road roller is used for rolling for 1 time.
According to a further optimization scheme, in the fourth step, the residual granite soil is subjected to loose paving, the loose paving thickness of the residual granite soil is not more than 30cm, stirring treatment is performed after the residual granite soil is subjected to loose paving, the maximum soil mass diameter of a soil body is not more than 5cm, and the fifth step is performed after whether the water content of the residual granite soil is less than 22% or not and the water content of the residual granite soil is less than 22% is determined in real time in the airing process.
And in the fifth step, firstly, a grader is used for leveling the granite residual soil, manual leveling is performed on certain uneven positions, and then a road roller is used for carrying out reciprocating static pressure on the granite residual soil once.
In a further optimization scheme, the grid size in the sixth step is 6 meters long and 5 meters wide, and the calculation formulas of the cement, lime and dry paper pulp are as follows:
mhthe mass of cement and lime doped in each square grid; m istThe mass of the granite residual soil in the square grids; a is the length of the square grid, and b is the width of the square grid; h is the residual soil loose paving thickness of the granite, ptThe density of the granite residual soil is obtained;
the mass ratio of the granite residual soil to the cement to the lime to the dry paper pulp is 100:2:1: 0.2.
And in the sixth step, the time for stirring the cement, the lime, the dry paper pulp and the granite residual soil by using a soil turning machine is not more than 3 hours.
And further optimizing the scheme, the rolling in the seventh step is propelled from two sides to the middle, and the width of the overlapped wheels of the rolling wheel of the road roller is 20-30 cm.
Further optimizing the scheme, the running speed of the road roller does not exceed 3km/h at most.
And (5) further optimizing the scheme, wherein the curing time in the step seven is not less than 5 days.
The total length of the large road of the airport in the Tanzhou city is 1238m, and the earthwork design in the project site is basically balanced. The excavation sections are mainly distributed at K4+340-K4+920 (excavation amount is 157298 m)3) In this range, the geological survey reports and the site survey identify (K4+ 34)0-K4+920) soil of the soil property class is granite residual soil.
The agricultural surface soil, humus soil, tree clumps, tree roots, weeds, sundries, garbage, dregs and other materials which are not suitable for roads on the surface of the earth in the range are removed, and the average thickness of the removed surface soil is 0.3 m. Then the static pressure, the micro vibration and the strong vibration of the road roller are respectively used for 1 time, and the road roller rolls for 1 time. The degree of compaction must satisfy more than 90%. The weeds and the sludge on the surface are removed completely, and the soil quality is ensured to be good.
The loose paving thickness is 30cm, then the filled soil is uniformly paved in the preset width and length range by a grader, the surface is leveled, and a road arch is formed according to the specification. The loose thickness is not more than 30cm, the particle size is less than 5cm, the soil is spread and aired, the soil is timely turned by a road mixer, the airing time is determined whether the water content is less than 22% according to the actual measurement of the filler, a grader is used for leveling, individual uneven positions are leveled manually, the phenomenon that the soil body is seriously uneven after being compacted is avoided, good interlayer connection is ensured, and the rolling is guaranteed to achieve the expected quick economic effect.
And (4) carrying out static pressure once on the virtual paving soil by a road roller, and slightly and flatly filling the soil to determine the over-filling and under-filling positions. Then, a land leveler is used for fine leveling, the raised part of the surface of the roadbed is leveled by the land leveler, the vertical and horizontal gradients are adjusted, and the thickness of the mixture is suitable to follow the principle of 'slightly higher but not lower' during virtual paving and shaping. When the material is slightly higher, the material is scraped by a land leveler, so that the standard requirement is easily met, and the phenomena of untight combination, peeling and the like caused by material supplementing again are avoided
Measuring square grids with length of 6 m and width of 5m with a tape measure, marking, drawing wires, and making the square grids with cement and lime, wherein the area of each square grid is 30m2Laying cement and lime in the grid mesh so as to accurately control the mixing amount of the cement and the lime, wherein the calculation formula is as follows:
mhthe mass of cement and lime doped in each square grid; m istThe mass of the residual soil of the granite in the squareAn amount; a is the length of the square grid, and b is the width of the square grid; h is the residual soil loose paving thickness of the granite, ptThe density of the granite residual soil is obtained;
the mass ratio of the cement to the lime to the dry paper pulp is 2:1: 0.5.
According to the standard requirements, high-quality block cement and lime above grade III are preferably selected, and overfire cement, lime or underfire cement and lime are strictly forbidden to be doped, because the effective components of the overfire cement, the lime, the underfire cement and the lime are low, and the underfire cement and the lime are high in hardness and are not suitable for crushing. In addition, the current specification does not clearly specify the requirements of cement and lime, and the following standards are recommended to be met, wherein the effective calcium and magnesium content of the cement and the lime is more than 70 percent; the fineness requirement is that the maximum grain diameter is not more than 5mm, and the throughput of a sieve pore of 0.074mm is not less than 75%. The hands should be scalded when the cement and lime are used for soaking in water for on-site inspection;
the cement and lime stored in the open air are easy to be dissolved when meeting water and CO in the air2Readily formed CaCO3The effective components are reduced, so the product should be stored in a ventilated and dry place and covered with canvas, and the storage time is not longer than 3 days.
The method comprises the steps of calculating cement, lime and dry paper pulp to provide basis for paving the cement, lime and dry paper pulp, strictly controlling the using amount of the cement, lime and dry paper pulp in the grid, and paving outer side lines of the grid by using the cement, lime and dry paper pulp which are reduced as much as possible when workers pave the cement, lime and dry paper pulp.
Crushing and mixing the mixture by a forced stable soil road mixer, wherein the mixing times are determined according to the field uniformity degree, so that the cement, lime and soil are uniformly mixed, and the filler is obviously coarse; the road mixer advances at the speed of 5m/min, and the mixing depth of the road mixer is controlled to be 2cm below each virtual soil paving layer.
The road mixer needs to fully stir, and a plain soil interlayer can not appear;
the hydration heat in the hydration reaction process of cement and lime is effectively utilized, and the mixing reaction time of the cement, the lime and the soil is not less than 3 hours;
the rolling process is carried out continuously according to the rolling principle that the straight line segment firstly has two sides and then has the middle, the curve segment firstly has the inner side and then has the outer side, firstly has the light weight and then has the heavy weight, firstly has the static pressure and then has the vibration pressure, and finally has the static pressure, and the mixed material which is well mixed at the same day is guaranteed to be rolled at the same day, and the test segment is divided into two 3 segments.
The residual soil of cement, lime, dry paper pulp and granite can be paved for 5 layers in total after multiple times of paving, each layer of filling soil must be made into a 4% bidirectional transverse drainage slope, rolling is approximately smooth, a drainage ditch is dredged in time, and the filling in the same day must be compacted in the same day.
When rolling, the rolling wheels of the road roller are pushed from two sides to the middle, the width of the overlapped wheels of the rolling wheels of the road roller is 20-30 cm, no pressure leakage and no dead angle are realized, and the uniform rolling is ensured.
When the vibratory roller rolls, static rolling is adopted for the first time so as to facilitate rolling, and static rolling is adopted for finishing the last time. The running speed of the road roller does not exceed 3km/h at most.
The grinding starting time has important influence on the improvement effect of cement, lime soil and dry paper pulp. If the rolling is too early, the soil body can be loosened and expanded due to volume expansion in the hydration reaction process of cement and lime; if the roller compaction is too late, the hydration heat cannot be fully utilized, and the stabilizing effect is affected. Tests show that the best effect can be obtained by rolling for about 3 hours after the cement, the lime and the soil are mixed.
Calculating the rolling time:
the rolling time A (filling square amount multiplied by the rolling pass number)/(paving thickness multiplied by the effective width multiplied by the running speed) is required every day
The effective width of compaction is equal to the width of a roller wheel, which is-0.25, and other parameters are determined by simulated construction
And (4) recording the actual rolling time B as the total compaction time of the work record, wherein A is less than B.
The vibration frequency of the road roller is 26-34Hz, and the running speed of the road roller is 2.8km/h-3.8 km/h.
During rolling, a proper rolling number is selected, and the excessive rolling number cannot increase the compaction degree of the rolled soil body, but the over-pressure phenomenon also occurs. Therefore, when the roadbed is rolled, the times of strong vibration are controlled according to the parameters (tonnage, amplitude, frequency and the like) of the rolling machine adopted during the rolling construction, the times of strong vibration of the road roller with smaller tonnage are more, the times of strong vibration of the road roller with larger tonnage are controlled so as to avoid the over-vibration phenomenon, and the times of strong vibration are not more than 4 generally. It is recommended to use static pressure 1 time + strong vibration (3-4) times + static pressure 1 time.
At the initial stage of construction completion, care is particularly taken to maintain, certain humidity is kept, the maintenance is not less than 5d, traffic is sealed, and roadways are strictly forbidden at the maintenance road section.
If the road surface appears white on the next day after rolling, the road surface cracks and the like, the water is sprayed for maintenance immediately.
Referring to fig. 2-6, the device adopted in the process of stirring and compacting the roadbed comprises an internal combustion locomotive 1, wherein two ends of the internal combustion locomotive 1 are respectively and fixedly connected with a second connecting rod 6, the second connecting rods 6 are horizontally arranged, one end, far away from the internal combustion locomotive 1, of each second connecting rod 6 is fixedly connected with a clamping assembly 8, one end, far away from the second connecting rods 6, of each clamping assembly 8 is fixedly connected with a first connecting rod 2, and a soil turning assembly or a soil compacting assembly is fixedly connected below each first connecting rod 2;
the clamping assembly 8 comprises fixed blocks 801 which are arranged in a central symmetry manner, the fixed blocks 801 are rotationally connected with rotating blocks 803, the rotating blocks 803 are in Contraband-shaped structures, one of the rotating blocks 803 is rotationally connected with a rotating pin 804, the rotating pin 804 is rotationally connected with the fixed blocks 801, the upper surface of one end, away from the other rotating block, of each rotating block 803 is provided with a clamping groove, a clamping pin 802 is vertically and slidably connected in each rotating block 803, the outer side wall of each clamping pin 802 is fixedly connected with two clamping blocks 805, the distance between the two clamping blocks 805 is matched with the thickness of each rotating block 803, and each clamping block 805 is movably clamped in each clamping groove; one fixing block 801 is fixedly connected with the first connecting rod 2, and the other fixing block 801 is fixedly connected with the second connecting rod 6; an inserting guide sleeve 201 is horizontally and fixedly connected below the first connecting rod 2, an inserting rod 601 is horizontally and fixedly connected below the second connecting rod 6, and the inserting rod 601 is in sliding fit with the inserting guide sleeve 201; the end of the insertion rod 601 near the insertion guide sleeve 201 is provided with a lead-in angle.
The soil turning assembly comprises a hinged rod 3, one end of the hinged rod is hinged to the middle of a first connecting rod 2, the other end of the hinged rod 3 is rotatably connected with a soil turning impeller 5, the middle of the hinged rod 3 is hinged to a piston end of a hydraulic cylinder 4, a cylinder body of the hydraulic cylinder 4 is hinged to a supporting plate 2, a hinged point of the hydraulic cylinder 4 and the supporting plate 2 is far away from the diesel locomotive 1, the hinged point of the hinged rod 3 and the supporting plate 2 is close to the diesel locomotive 1, the soil turning impeller 5 is driven by an engine of the diesel locomotive 1, and the soil turning impeller 5 and the engine of the diesel locomotive 1 are driven in a conventional mode including but not limited to belt driving, and chain driving or universal shaft connecting with a gearbox driving;
the soil compacting assembly comprises a support fixedly connected below the first connecting rod 2, and a pressing roller 7 is rotatably connected to the support.
Can stir through above-mentioned device and turn over soil, compaction operation, can avoid the vehicle to turn around and carry out the operation, when turning over soil operation, the device only can realize the operation of turning over soil that comes and goes through turning to of diesel locomotive 1 after advancing to the terminal point, when diesel locomotive 1 travels back, the pneumatic cylinder 4 shrink of advancing the end before the control, drive hinge bar 3 rotates, hinge bar 3 drives and turns over native impeller 5 and upwards lifts, the pneumatic cylinder 4 extension of the one end that will move ahead of control drives hinge bar 3 and rotates, hinge bar 3 drives and turns over native impeller 5 and advances downwards, it presses close to granite residual soil to turn over native impeller 5, realize the function of turning over soil along with the walking of diesel locomotive 1, the height of turning over soil can be controlled through the flexible volume of adjustment pneumatic cylinder 4.
By arranging the clamping assembly 8, when compaction operation is required, the clamping pin 802 is pulled upwards to enable the first connecting rod 2 and the second connecting rod 6 to be away from each other, at the moment, the clamping block 805 is separated from the clamping groove, the rotating blocks 803 rotate along the rotating pins 804, and the two rotating blocks 803 are separated; at the moment, the top surfaces of the rotating blocks 803 clamp the main fixture block 805 to prevent the clamping pin 802 from falling downwards, then the first connecting rod 2 and the second connecting rod 6 are close to each other, the two rotating blocks 803 can rotate along with the mutual close to enable the two rotating blocks to be hooked with each other, after the operation is in place, the fixture block 805 falls into the clamping slot, at the moment, the two rotating blocks 803 cannot rotate, so that the clamping function is realized, the insertion rod 601 is in contact with the insertion guide sleeve 201 before the two rotating blocks 803, and a guide function is provided for the insertion clamping;
through the cooperation of above-mentioned device jointly, can use a diesel locomotive 1 to realize two kinds of different functions, reduce equipment occupation site space, the process construction.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A granite residual soil roadbed improvement construction method is characterized in that: the method comprises the following steps:
firstly, surveying on site, wherein a measurer measures the site;
cleaning the site, and removing agricultural surface soil, humus soil, tree clusters, tree roots, weeds, sundries, garbage and muck which are not suitable for roads in the construction range;
step three, substrate treatment, namely rolling treatment is carried out on the cleaned site;
step four, distributing soil and airing, namely paving the residual granite soil on the substrate processed in the step three, and turning and airing;
leveling static pressure, namely leveling the residual soil of the granite aired in the fourth step, and performing static pressure once;
step six, drawing grid mixed materials, drawing grids on the upper surface of the granite residual soil subjected to static pressure in the step five, paving cement, lime and dry paper pulp in each grid, and stirring the granite residual soil, the cement, the lime and the dry paper pulp after paving;
and step seven, rolling and maintaining, namely rolling the materials stirred in the step five, maintaining after rolling, and forbidding passing in the period.
2. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and in the third step, the rolling treatment is respectively carried out for 1 time by using static pressure, micro vibration and strong vibration of the road roller, and then the road roller is used for rolling for 1 time.
3. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: in the fourth step, the loose paving treatment of the granite residual soil comprises the following steps: and D, stirring the loose granite residual soil to ensure that the maximum soil mass diameter of the soil body is not more than 5cm after the loose granite residual soil is paved to a thickness of not more than 30cm, and carrying out the fifth step after determining whether the water content of the granite residual soil is less than 22% and the water content of the granite residual soil is less than 22% in real time in the airing process.
4. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and fifthly, leveling the granite residual soil by using a grader, manually leveling individual uneven positions, and then carrying out reciprocating static pressure on the granite residual soil once by using a road roller.
5. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: the grid size in the sixth step is 6 meters long and 5 meters wide, and the calculation formula of the cement, lime and dry paper pulp is as follows:
mhthe mass of cement, lime and dry paper pulp is doped in each square; m istThe mass of the granite residual soil in the square grids; a is the length of the square grid, and b is the width of the square grid; h is the residual soil loose paving thickness of the granite, ptThe density of the granite residual soil is obtained;
the mass ratio of the granite residual soil to the cement to the lime to the dry paper pulp is 100:2:1: 0.2.
6. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and in the sixth step, the cement, lime, dry paper pulp and granite residual soil are stirred by a soil turning machine for no more than 3 hours.
7. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and seventhly, pushing from two sides to the middle during rolling, wherein the width of the overlapped wheel of the rolling wheel of the road roller is 20-30 cm.
8. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and seventhly, the running speed of the road roller does not exceed 3km/h at most.
9. The improved construction method of the granite residual soil roadbed as claimed in claim 1, wherein the construction method comprises the following steps: and the curing time in the seventh step is not less than 5 days.
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| CN202110692905.XA CN113373749A (en) | 2021-06-22 | 2021-06-22 | Improved construction method for granite residual soil roadbed |
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| CN114703710A (en) * | 2022-03-17 | 2022-07-05 | 中国公路工程咨询集团有限公司 | Granite residual soil roadbed structure and construction method thereof |
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