CN114250660B - Method for reducing subgrade settlement deformation - Google Patents
Method for reducing subgrade settlement deformation Download PDFInfo
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- CN114250660B CN114250660B CN202210092028.7A CN202210092028A CN114250660B CN 114250660 B CN114250660 B CN 114250660B CN 202210092028 A CN202210092028 A CN 202210092028A CN 114250660 B CN114250660 B CN 114250660B
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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
- E01C3/006—Foundations for pavings made of prefabricated single units
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention belongs to the field of road construction, in particular to a method for reducing subgrade settlement deformation, wherein a subgrade structure manufactured by the method comprises a rammed earth layer, a concrete layer and a pavement layer from bottom to top; a supporting and fixing device and a filling device are embedded in the roadbed structure; the supporting and fixing devices are uniformly distributed between the rammed earth layer and the concrete layer, and the filling devices are uniformly distributed between the rammed earth layer and the concrete layer; the filling devices and the supporting and fixing devices are distributed between the rammed soil layer and the concrete layer in a staggered manner; the upper surface of the concrete layer is sprayed with asphalt; uniformly distributed railings are embedded in the concrete layer, penetrate through the geotechnical composite drainage net and reach the pavement layer, uniformly distributed quicklime bags are embedded between the concrete layer and the pavement layer, and the quicklime bags are located among the uniformly distributed railings; after the pavement layer is paved, heating the pavement; the invention has simple structure, can strengthen the tamping degree of the roadbed structure and reduce the settlement phenomenon of the roadbed.
Description
Technical Field
The invention belongs to the field of road construction, and particularly relates to a method for reducing subgrade settlement deformation.
Background
The roadbed is a foundation of a track or a road surface and is a geotechnical structure formed by excavation or filling; the roadbed mainly has the functions of providing necessary conditions for track or road surface laying and train or traveling operation, bearing static load and dynamic load of track and locomotive vehicle or road surface and traffic load, and transmitting and diffusing the load to the deep part of the foundation.
In recent years, infrastructure of China is continuously improved, highway construction is also performed with a rapid progress, and because China is wide in breadth and complex and changeable in climate, the weather such as freezing rain and snow often influences the normal use and driving safety of highway engineering, so that the development of the highway engineering is hindered; particularly, flood is influenced by factors such as design and construction every rainy season, and some highways are often damaged when flood occurs in flood season, so that the traffic capacity is reduced slightly, and phenomena such as water damage, cracks, pavement structural damage and the like occur seriously, so that the traffic is forced to be interrupted, and the driving safety of passersby is damaged.
To the water damage phenomenon of road bed, mainly because the arrangement of construction progress is sometimes not in place to the processing of road bed for the filled soil compactness of road bed is not enough, thereby in the in-process that drops into use at subsequent road surface because the erosion of moisture makes the earth bonding degree in the roadbed structure reduce, along with the more and more serious of moisture erosion, finally lead to the supporting force of roadbed structure's bottom can't support roadbed structure completely, and then lead to the phenomenon production of road bed settlement.
In view of this, in order to overcome the above technical problems, the present invention provides a method for reducing subgrade settlement deformation, which solves the above technical problems.
Disclosure of Invention
The invention provides a method for reducing subgrade settlement deformation, aiming at overcoming the defects of the prior art and solving the problem that subgrade settlement occurs under the corrosion of moisture due to insufficient filling compactness of a subgrade.
The technical scheme adopted by the invention for solving the technical problem is as follows: the invention discloses a method for reducing subgrade settlement deformation, which comprises the following steps
The roadbed structure comprises a rammed earth layer, a concrete layer and a pavement layer from bottom to top, wherein the cross section of the concrete layer is in an arch bridge shape, and the rammed earth layer is positioned below the concrete layer;
the lime bags are embedded in the rammed earth layer, are uniformly distributed in the rammed earth layer, and expand when meeting water to dissipate heat so as to improve the supporting strength of the rammed earth layer;
the supporting device is positioned in the ramming layer and the concrete layer, and the strength of the ramming layer is improved by the supporting device in a grouting manner;
the method for reducing the settlement deformation of the roadbed comprises the following steps:
s1: before operation, firstly, measurement and alignment work is carried out, sampling is carried out along the engineering line and a soil borrowing field, tests of natural liquid limit, plasticity index, density, water content and the like are carried out according to a JTJ05-93 standard test method, the tests are used for filling soil samples, the maximum dry solubility, the optimum water content or gross volume specific gravity and the California bearing ratio CBR value of soil are measured, and test results are reported to a supervision engineer for approval;
s2: on the basis of the S1, trees, weeds, shrubs and the like in the land range of the route are removed and transported to a designated place; removing the structures in the route land range according to requirements; in the excavation or filling area, all humus soil, silt and surface vegetation are excavated and removed, and are abandoned outside the land for paving the roadbed according to the regulations;
s3: on the basis of S2, digging inclined ditches of 0.5m at two sides of the land using range of the route, tamping the bottoms of the ditches, laying a geotechnical composite drainage network on an inclined plane close to the center line of the land using range, then uniformly inserting steel columns into the inclined plane on which the geotechnical composite drainage network is laid, and then injecting rubber concrete made by a petrochemical method into the inclined ditches, wherein the top ends of the steel columns are higher than the road surface, and the bottoms of the steel columns are lower than the bottoms of the inclined ditches;
s4: on the basis of S3, the lime bags are evenly embedded into the land in the range surrounded by the inclined ditches, then the cleaned land is compacted by a rammer and a road roller to form a rammed soil layer, a layer of geotechnical composite drainage net is laid above the rammed soil layer after the road surface is compacted, and the geotechnical composite drainage net laid above the rammed soil layer and the geotechnical composite drainage net laid on the inclined ditches are nailed together by a nail gun; then inserting the supporting device into the rammed soil layer through the meshes on the geotechnical composite drainage net, and injecting slurry into the rammed soil layer through the supporting device by using the grouting machine;
s5: and on the basis of S4, after the slurry injected into the ramming layer is completely solidified, spraying rubber concrete made by a petrochemical method on the ramming layer, fusing the rubber concrete with the rubber concrete injected into the inclined groove, forming a concrete layer after the rubber concrete is dried, spraying a layer of asphalt on the upper surface of the concrete layer, after the asphalt is dried, spraying the concrete on the upper surface of the asphalt to form a pavement layer, and putting the pavement layer into use after the pavement layer is solidified and dried.
Preferably, a storage bag is embedded in the lime bag, evenly distributed delivery pipes are fixedly installed in the storage bag, the delivery pipes extend from the interior of the storage bag to the exterior of the lime bag, and petroleum resin is filled in the storage bag.
Preferably, the supporting device comprises an injection tube, the outer wall of the injection tube is provided with injection holes which are uniformly distributed, the injection tube and the lime bag are distributed in a staggered manner, and the top of the injection tube is in threaded connection with the supporting seat.
Preferably, the upper surface of the support seat is fixedly provided with a barb.
Preferably, the section of the ramming layer is isosceles trapezoid, a steel column is inserted into the oblique edge of the ramming layer, through holes are uniformly formed in the outer wall of the steel column, expansion powder is filled in the through holes, and water-soluble films are fixedly mounted at two ends of the through holes.
Preferably, the concrete layer is provided with uniformly distributed pits, the upper surface of the concrete layer is sprayed with asphalt, and the pavement layer is heated after being paved.
Preferably, rubber columns which are uniformly distributed are embedded between the concrete layer and the pavement layer.
Preferably, the through holes in the steel column are gradually enlarged from top to bottom.
Preferably, the expanded powder is contained in an expanded bag having a cylindrical shape.
Preferably, the material of the expansion bag contains aramid fiber.
The invention has the following beneficial effects:
1. the invention relates to a method for reducing subgrade settlement deformation, which comprises the steps of digging inclined ditches at two sides of a land area when a subgrade is constructed, inserting steel columns on inclined planes of the inclined ditches, which are close to a central line of the land area, then injecting rubber concrete made by a petrochemical method into the inclined ditches, laying the rubber concrete made by the petrochemical method above a rammed soil layer, combining the rubber concrete with the rubber concrete injected into the inclined ditches, forming a concrete layer after the rubber concrete is dried, and protecting the upper part and two sides of the rammed soil layer by the aid of the arch bridge-shaped section of the concrete layer, so that the problem of road surface collapse caused by erosion of two sides of the rammed soil layer by rainwater is solved.
2. According to the method for reducing the subgrade settlement deformation, when a large amount of moisture permeates into a rammed soil layer, the lime bag absorbs a certain equivalent amount of moisture from the rammed soil layer and then is subjected to heat dissipation expansion, so that the rammed soil layer is extruded to the periphery, and the phenomenon that when the rammed soil layer is invaded by moisture, the soil inside the rammed soil layer becomes soft, and the road surface is collapsed is avoided; simultaneously because the lime bag has produced thereby the inside petroleum resin of a large amount of heats messenger lime bag and has melted, because the lime bag has certain volume moreover, so the lime in the lime bag can extrude the storage bag to inside when expanding thereby make the inside petroleum resin of storage bag flow out to the earth gap in the rammed earth layer along the conveyer pipe to improve the adhesion stress between the soil granule, and then reduce the appearance of the road bed settlement phenomenon because the infiltration of rainwater in the rammed earth layer leads to.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a structural view of the supporting device of the present invention.
In the figure: 1. a roadbed structure; 11. tamping a soil layer; 12. a concrete layer; 13. a pavement layer; 2. a lime bag; 21. a storage bag; 22. a delivery pipe; 3. a support device; 31. an injection tube; 32. an injection hole; 33. a supporting seat; 34. hooking; 4. a steel column; 41. a through hole; 42. expanding the bag; 5. asphalt; 51. a pit; 52. a rubber column.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 2, a method for reducing subgrade settlement deformation according to the invention comprises
The roadbed structure 1 comprises a rammed earth layer 11, a concrete layer 12 and a pavement layer 13 from bottom to top, wherein the section of the concrete layer 12 is in an arch bridge shape, and the rammed earth layer 11 is positioned below the concrete layer 12;
the lime bags 2 are embedded in the rammed earth layer 11, the lime bags 2 are uniformly distributed in the rammed earth layer 11, and the lime bags 2 expand when meeting water to dissipate heat and are used for improving the supporting strength of the rammed earth layer 11;
the asphalt 5 is sprayed on the upper surface of the concrete layer 12, and after the pavement layer 13 is paved, the pavement layer 13 is heated;
the supporting device 3 is positioned in the rammed earth layer 11 and the concrete layer 12, and the strength of the rammed earth layer 11 is improved by the supporting device 3 in a grouting manner;
the method for reducing the settlement deformation of the roadbed comprises the following steps:
s1: before operation, firstly, measurement and alignment work is carried out, sampling is carried out along the engineering line and a soil borrowing field, tests of natural liquid limit, plasticity index, density, water content and the like are carried out according to a JTJ05-93 standard test method, the tests are used for filling soil samples, the maximum dry solubility, the optimum water content or gross volume specific gravity and the California bearing ratio CBR value of soil are measured, and test results are reported to a supervision engineer for approval;
s2: on the basis of the S1, trees, weeds, shrubs and the like in the land range of the route are removed and transported to a designated place; removing the structures in the route land range according to requirements; in the excavation or filling area, all humus soil, silt and surface vegetation are excavated and removed, and are abandoned outside the land for paving the roadbed according to the regulations;
s3: on the basis of S2, digging inclined ditches of 0.5m at two sides of the route land using range, leveling the bottoms of the ditches, laying a geotechnical composite drainage network on an inclined plane close to the center line of the land using range, then uniformly inserting the steel columns 4 into the inclined plane on which the geotechnical composite drainage network is laid, and then injecting rubber concrete made by a petrochemical method into the inclined ditches, wherein the top ends of the steel columns 4 are higher than the road surface, and the bottoms of the steel columns 4 are lower than the bottoms of the inclined ditches;
s4: on the basis of S3, the lime bags 2 are uniformly embedded into the land in the range surrounded by the inclined ditches, then the cleaned land is compacted by a tamping machine and a road roller to form a rammed soil layer 11, a layer of geotechnical composite drainage net is laid above the rammed soil layer 11 after the road surface is compacted, and the geotechnical composite drainage net laid above the rammed soil layer 11 and the geotechnical composite drainage net laid on the inclined ditches are nailed together by a nail gun; then inserting the supporting device 3 into the rammed soil layer 11 through meshes on the geotechnical composite drainage net, and injecting slurry into the rammed soil layer 11 through the supporting device 3 by using a grouting machine;
s5: on the basis of S4, after the slurry injected into the rammed earth layer 11 is completely solidified, spraying rubber concrete made by a petrochemical method on the rammed earth layer 11, fusing the rubber concrete with the rubber concrete injected into the inclined groove, forming a concrete layer 12 after the rubber concrete is dried, spraying a layer of asphalt 5 on the upper surface of the concrete layer 12, after the asphalt 5 is dried, spraying concrete on the upper surface of the asphalt 5 to form a road surface layer 13, and putting the road surface layer 13 into use after the road surface layer 13 is solidified and dried;
when the roadbed is constructed during working, firstly, the inclined ditches are dug at two sides of the land area, the steel column 4 is inserted on the inclined plane of the inclined ditches close to the central line of the land area, then the rubber concrete made by a petrochemical method is injected into the inclined ditches, then the lime bag 2 is embedded into the land area surrounded by the inclined ditches, and then the rammed soil layer 11 is tamped, when rainwater corrodes into the rammed soil layer 11, the lime bag 2 is subjected to heat dissipation expansion after being corroded by the rainwater and extrudes the rammed soil layer 11 to the periphery, so that the phenomenon of roadbed settlement caused by insufficient support strength due to over-soft soil in the rammed soil layer 11 due to the corrosion of the rainwater is avoided; inserting the supporting device 3 into the rammed soil layer 11, grouting slurry into the rammed soil layer 11 by the grouting machine through the supporting device 3, and enabling slurry to spread among soil gaps in the rammed soil layer 11 to improve the cohesiveness among the soil, so that the soil is prevented from being soft after water permeates into the rammed soil layer 11; after the rammed soil layer 11 is grouted and the slurry is completely solidified, rubber concrete made by a petrochemical method is laid above the rammed soil layer 11 and combined with the rubber concrete injected into the inclined groove, a concrete layer 12 is formed after the rubber concrete is dried, the section of the concrete layer 12 is in an arch bridge shape to protect the upper side and two sides of the rammed soil layer 11, and the problem of road surface collapse caused by erosion of rainwater on two sides of the rammed soil layer 11 is avoided; at the moment, the steel column 4 connects the rubber concrete in the inclined groove with the rubber concrete above the rammed earth layer 11, so that the problem that the bonding strength of the rubber concrete between the rubber concrete above the rammed earth layer 11 is insufficient, and the phenomenon that the bonding property between the soil of the rammed earth layer 11 is reduced and the roadbed subsides due to the fact that the water in the rammed earth layer 11 is increased due to the fact that cracks occur at the bonding position of the roadbed caused by erosion of rainwater is reduced is avoided; spraying a layer of asphalt 5 on the upper surface of the concrete layer 12, so that rainwater is prevented from seeping into the rammed earth layer 11 from the road surface layer 13, after the asphalt 5 is dried, spraying the concrete on the upper surface of the asphalt 5 to form the road surface layer 13, after the road surface layer 13 is paved, after the road surface layer 13 is cooled, heating the upper surface of the road surface layer 13 to enable the asphalt 5 at the bottom of the road surface layer 13 to be blended into the road surface layer 13 and the concrete layer 12 to form a waterproof layer, and preventing rainwater from seeping through gaps between the road surface layers 13 in rainy days, so that a large amount of water is stored in the roadbed structure 1 to influence the strength between the roadbed structures 1, and the phenomenon of roadbed settlement is caused;
rubber concrete prepared by a petrochemical method:
soaking rubber particles in tap water until the particles completely sink, stirring cement and the rubber particles, adding water, stirring again, spreading out, drying in the air, and removing redundant powder; then putting the mixture into water for maintenance for 3 days, taking out the mixture when in use, and airing the mixture for mixing.
In one embodiment of the invention, a storage bag 21 is embedded in the lime bag 2, evenly distributed delivery pipes 22 are fixedly installed in the storage bag 21, the delivery pipes 22 extend from the interior of the storage bag 21 to the exterior of the lime bag 2, and petroleum resin is filled in the storage bag 21;
when the rammed soil layer 11 is in work and a large amount of moisture penetrates, the lime bag 2 absorbs a certain equivalent amount of moisture from the rammed soil layer 11 and then dissipates heat and expands, so that the rammed soil layer 11 is extruded all around to avoid that the soil in the rammed soil layer 11 becomes soft when the rammed soil layer is invaded by moisture, and further the pavement is collapsed; meanwhile, as the lime bag 2 generates a large amount of heat, the petroleum resin inside the lime bag 2 is melted, and the lime bag 2 has a certain volume, the lime in the lime bag 2 can extrude the storage bag 21 inwards when expanding, so that the petroleum resin inside the storage bag 21 flows out to soil gaps in the rammed earth layer 11 along the conveying pipe 22, the bonding force among soil particles is improved, and the roadbed settlement phenomenon caused by the penetration of rainwater in the rammed earth layer 11 is reduced.
As an embodiment of the present invention, the supporting device 3 includes an injection tube 31, the outer wall of the injection tube 31 is provided with injection holes 32 which are uniformly distributed, the injection tube 31 and the lime bag 2 are distributed in a staggered manner, and the top of the injection tube 31 is in threaded connection with the supporting seat 33;
during operation, insert injection tube 31 in rammed earth layer 11, take off supporting seat 33, and link to each other and to the inside slip casting of injection tube 31 with the threaded connection department of supporting seat 33 on injection tube 31 with the slip casting machine, the slurry is injected into rammed earth layer 11 through injection hole 32 on injection tube 31, improve the cohesiveness of earth in rammed earth layer 11, avoid the appearance of the road bed settlement problem that leads to because ramming unstability of rammed earth layer 11, on filling back injection tube 31 with supporting seat 33 again after the injection is accomplished, wait for the slurry to solidify completely, lay rubber concrete in the top of rammed earth layer 11 and form concrete layer 12, supporting seat 33 is arranged in concrete layer 12 at this moment and provides the supporting role for the road surface.
As an embodiment of the present invention, a barb 34 is fixedly installed on the upper surface of the supporting seat 33;
during operation, the supporting seat 33 provides support for the vehicle to travel on the roadbed, and the barbs 34 on the supporting seat 33 firmly hook the concrete layer 12, so that cracks between the concrete layer 12 and the rammed earth layer 11 caused by erosion of rainwater are avoided, and displacement is finally generated between the concrete layer 12 and the rammed earth layer 11 along with the increase of the erosion strength of rainwater.
As an embodiment of the invention, the section of the ramming layer 11 is an isosceles trapezoid, a steel column 4 is inserted into the oblique side of the ramming layer 11, through holes 41 are uniformly formed in the outer wall of the steel column 4, expansion powder is filled in the through holes 41, and water-soluble films are fixedly mounted at both ends of the through holes 41;
when the concrete-filled composite material works, when water seepage occurs at the joint surface of the rammed soil layer 11 and the concrete layer 12, water dissolves the water-soluble film on the through hole 41, so that the water enters the through hole 41, and the expansion powder and the water expand, wherein the expansion powder is a copolymer of 'gel' super absorbent resin SAP polyacrylate sylvite or sodium and polyacrylamide; the crystal is a white powdery crystal in a natural state, and expands dozens of times when meeting water; the expansion powder expands towards the rammed earth layer 11 through the two ends of the through hole 41, so that the soil compactness of the rammed earth layer 11 combined with the inclined plane of the concrete layer 12 is increased, and the condition that the concrete layer 12 loses support and causes settlement due to soil loss caused by water seepage of the rammed earth layer 11 is reduced.
As an embodiment of the present invention, the concrete layer 12 is provided with pits 51 uniformly distributed, the upper surface of the concrete layer 12 is sprayed with asphalt 5, and the pavement layer 13 is subjected to a heating treatment after the pavement is completed;
in operation, the asphalt 5 partially flows into the pit 51 on the concrete layer 12 after being heated, so that the bonding strength between the asphalt 5 and the concrete layer is improved, and the phenomenon that the roadbed is settled due to the fact that the bonding degree between 11 soils in the rammed earth layer is reduced because moisture permeates into the rammed earth layer 11 from the concrete layer 12 is further reduced.
As an embodiment of the present invention, rubber columns 52 are embedded between the concrete layer 12 and the pavement layer 13 and are uniformly distributed;
during work, after the subgrade is paved and vehicles run on the subgrade, the rubber columns 52 buffer the stress on the road surface, so that the occurrence of accumulated settlement of the subgrade is avoided; meanwhile, the rubber columns 52 strengthen the connection strength between the concrete layer 12 and the road surface layer 13, and reduce the separation of the road surface layer 13 and the concrete layer 12 caused by rain erosion.
As an embodiment of the present invention, the through holes 41 on the steel columns 4 are gradually enlarged from top to bottom;
the during operation, the both ends that the inflation powder in the through-hole 41 passes through the through-hole 41 make the closely knit degree of earth of ramming soil layer 11 that combines together with the 12 inclined planes of concrete layer to ramming soil layer 11 inflation and increase, this moment because the aperture of through-hole 41 from top to bottom progressively enlarges, the inflation powder content in the through-hole 41 progressively increases promptly, thereby when the inflation powder inflation, the inflation area of the inflation powder of steel column 4 bottom is greater than the inflation area of the inflation powder at steel column 4 top, the soil of ramming soil layer 11 of steel column 4 bottom makes the degree of adhesion between the earth inseparabler because the inflation of inflation powder under the erosion of rainwater, avoid because the soil property that ramming soil layer 11 infiltration arouses runs off, lead to concrete layer 12 to lose the condition that the support causes the phenomenon of subsiding.
As an embodiment of the present invention, the expansion powder is contained in an expansion bag 42 having a cylindrical shape;
during operation, the inflation bag 42 that expands behind the water is met to the inflation powder, and inflation bag 42 extends to the both ends of through-hole 41 under the inflation effect of inflation powder for form the shape of similar "root" between inflation bag 42 and the steel column 4, thereby make the combination of steel column 4 and rammed earth layer 11 more firm, thereby avoid because the soil property loss that rammed earth layer 11 infiltration arouses, lead to concrete layer 12 to lose the condition that supports and cause the settlement phenomenon.
In one embodiment of the present invention, the material of the expansion bag 42 contains aramid fibers;
when the aramid fiber is used, the aramid fiber is a novel high-tech synthetic fiber, has the excellent performances of ultrahigh strength, high modulus, high temperature resistance, acid and alkali resistance, light weight and the like, has the strength of 5 to 6 times that of a steel wire, the modulus of 2 to 3 times that of the steel wire or glass fiber, the toughness of 2 times that of the steel wire, the weight of only about 1/5 of that of the steel wire, and does not decompose or melt at the temperature of 560 ℃; the insulating material has good insulativity and ageing resistance, and has a long life cycle; the aramid fiber is added to improve the strength of the expansion bag 42 and reduce the possibility that the expansion powder will expand and break the expansion bag 42.
The specific working mode is as follows:
when roadbed construction is carried out, firstly, inclined ditches are dug at two sides of a land area ground, a steel column 4 is inserted into an inclined plane of each inclined ditch close to a central line of the land area ground, then rubber concrete made by a petrochemical method is injected into each inclined ditch, then a lime bag 2 is embedded into the land area surrounded by the inclined ditches, then a rammed soil layer 11 is tamped, and when rainwater corrodes into the rammed soil layer 11, the lime bag 2 is corroded by the rainwater and then expands to extrude the rammed soil layer 11 to the periphery in a heat dissipation manner; inserting the supporting device 3 into the rammed earth layer 11, grouting slurry into the rammed earth layer 11 through the supporting device 3 by using the grouting machine, and enabling slurry to spread among soil gaps in the rammed earth layer 11 to improve the cohesiveness among the soil; after the rammed soil layer 11 is grouted and the slurry is completely solidified, rubber concrete made by a petrochemical method is laid above the rammed soil layer 11 and combined with the rubber concrete injected into the inclined groove, a concrete layer 12 is formed after the rubber concrete is dried, and the section of the concrete layer 12 is in an arch bridge shape to protect the upper side and two sides of the rammed soil layer 11; at the moment, the steel column 4 connects the rubber concrete in the inclined ditch with the rubber concrete above the rammed soil layer 11; spraying a layer of asphalt 5 on the upper surface of the concrete layer 12 so as to isolate rainwater from infiltrating into the rammed earth layer 11 from the pavement layer 13, after the asphalt 5 is dried, spraying concrete on the upper surface of the asphalt 5 so as to form a pavement layer 13, and after the pavement layer 13 is cured and dried, putting into use;
when a large amount of moisture infiltrates into the rammed soil layer 11, the lime bag 2 absorbs a certain equivalent of moisture from the rammed soil layer 11 and then dissipates heat and expands, so that the rammed soil layer 11 is squeezed all around to avoid that the soil inside the rammed soil layer 11 becomes soft when the rammed soil layer is invaded by moisture, and further the collapse of a road surface is caused; meanwhile, as the lime bag 2 generates a large amount of heat to melt the petroleum resin inside the lime bag 2, and the lime bag 2 has a certain volume, the lime in the lime bag 2 can press the storage bag 21 inwards when expanding, so that the petroleum resin inside the storage bag 21 flows out to soil gaps in the rammed soil layer 11 along the conveying pipe 22, and the bonding force among soil particles is improved;
inserting the injection tube 31 into the rammed earth layer 11, taking down the supporting seat 33, connecting the injection machine with the threaded connection part of the injection tube 31 and the supporting seat 33, injecting slurry into the injection tube 31, injecting the slurry into the rammed earth layer 11 through the injection hole 32 on the injection tube 31, improving the cohesiveness of the soil in the rammed earth layer 11, re-installing the supporting seat 33 on the injection tube 31 after the injection is completed, laying rubber concrete above the rammed earth layer 11 to form a concrete layer 12 after the slurry is completely solidified, and then placing the supporting seat 33 in the concrete layer 12 to provide a supporting effect for the road surface;
when water seepage occurs at the joint surface of the rammed soil layer 11 and the concrete layer 12, water dissolves the water-soluble film on the through hole 41, so that the water enters the through hole 41, the expansion powder and the water are expanded, the expansion powder expands towards the rammed soil layer 11 through the two ends of the through hole 41, and the soil compactness of the rammed soil layer 11 combined with the inclined surface of the concrete layer 12 is increased;
after the pavement layer 13 is paved, after the pavement layer 13 is cooled, heating the upper surface of the pavement layer 13 to enable the asphalt 5 at the bottom of the pavement layer 13 to be blended into the pavement layer 13 and the concrete layer 12 to form a waterproof layer, and forming the pit 51 on the concrete layer 12 to improve the bonding strength between the asphalt 5 and the concrete layer 12;
the expansion powder in the through hole 41 expands towards the rammed earth layer 11 through the two ends of the through hole 41, so that the soil compactness of the rammed earth layer 11 combined with the inclined plane of the concrete layer 12 is increased, at the moment, the aperture of the through hole 41 is gradually enlarged from top to bottom, namely, the content of the expansion powder in the through hole 41 is gradually increased, so that when the expansion powder expands, the expansion area of the expansion powder at the bottom of the steel column 4 is larger than that of the expansion powder at the top of the steel column 4, and the soil of the rammed earth layer 11 at the bottom of the steel column 4 is more compact in caking property due to the expansion of the expansion powder under the erosion of rainwater;
the expansion powder expands in the expansion bag 42 after meeting water, and the expansion bag 42 extends towards two ends of the through hole 41 under the expansion effect of the expansion powder, so that a shape similar to a tree root is formed between the expansion bag 42 and the steel column 4, and the combination of the steel column 4 and the rammed earth layer 11 is firmer.
In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A method for reducing subgrade settlement deformation comprises
The roadbed structure (1) comprises a rammed earth layer (11), a concrete layer (12) and a pavement layer (13) from bottom to top, the cross section of the concrete layer (12) is in an arch bridge shape, and the rammed earth layer (11) is positioned below the concrete layer (12);
the lime bags (2) are embedded in the rammed earth layer (11), the lime bags (2) are uniformly distributed in the rammed earth layer (11), and the lime bags (2) expand when meeting water to dissipate heat and are used for improving the supporting strength of the rammed earth layer (11);
the method is characterized in that:
the asphalt (5) is sprayed on the upper surface of the concrete layer (12), and after the pavement layer (13) is paved, the pavement layer (13) is heated;
the supporting device (3) is positioned in the rammed earth layer (11) and the concrete layer (12), and the strength of the rammed earth layer (11) is improved by the supporting device (3) in a grouting mode;
the method for reducing the settlement deformation of the roadbed comprises the following steps:
s1: before operation, firstly, measuring and line setting work is carried out, sampling is carried out along the engineering line and a soil borrowing field, tests of natural liquid limit, plasticity index, density and water content are carried out according to a JTJ05-93 standard test method, the tests are used for filling soil samples, the maximum dry solubility, the optimum water content or gross volume specific gravity and the California bearing ratio CBR value of soil are measured, and the test results are reported to a supervision engineer for approval;
s2: on the basis of the S1, trees, weeds and shrubs in the land range of the route are removed and transported to a designated place; removing the structures in the route land range according to requirements; in the excavation or filling area, all humus soil, silt and surface vegetation are excavated and removed, and are abandoned outside the land for paving the roadbed according to the regulations;
s3: on the basis of S2, digging inclined ditches of 0.5m at two sides of the land using range of the route, tamping the bottoms of the ditches, laying a geotechnical composite drainage network on an inclined plane close to the center line of the land using range, then uniformly inserting the steel columns (4) into the inclined plane on which the geotechnical composite drainage network is laid, and then injecting rubber concrete made by a petrochemical method into the inclined ditches, wherein the top ends of the steel columns (4) are higher than the road surface, and the bottoms of the steel columns (4) are lower than the bottoms of the inclined ditches;
s4: on the basis of S3, the lime bags (2) are evenly embedded into the land in the range surrounded by the inclined ditches, then the cleaned land is compacted by a rammer and a road roller to form a rammed soil layer (11), a layer of geotechnical composite drainage net is laid above the rammed soil layer (11) after the road surface is compacted, and the geotechnical composite drainage net laid above the rammed soil layer (11) is nailed together with the geotechnical composite drainage net laid on the inclined ditches by a nailing gun; then inserting the supporting device (3) into the rammed soil layer (11) through meshes on the geotechnical composite drainage net, and injecting slurry into the rammed soil layer (11) through the supporting device (3) by the grouting machine;
s5: on the basis of S4, after slurry injected into the rammed earth layer (11) is completely solidified, rubber concrete made by a petrochemical method is sprayed on the rammed earth layer (11) and is fused with the rubber concrete injected into the inclined groove, a concrete layer (12) is formed after the rubber concrete is dried, a layer of asphalt (5) is sprayed on the upper surface of the concrete layer (12), after the asphalt (5) is dried, concrete is sprayed on the upper surface of the asphalt (5) to form a pavement layer (13), and the pavement layer (13) can be put into use after being cured and dried;
the lime bag (2) is embedded with a storage bag (21), evenly distributed delivery pipes (22) are fixedly installed inside the storage bag (21), the delivery pipes (22) extend from the inside of the storage bag (21) to the outside of the lime bag (2), and petroleum resin is filled inside the storage bag (21).
2. The method for reducing subgrade settlement deformation according to claim 1, wherein the step of: the supporting device (3) comprises injection tubes (31), the outer walls of the injection tubes (31) are provided with injection holes (32) which are uniformly distributed, the injection tubes (31) and the lime bags (2) are distributed in a staggered mode, and the top of each injection tube (31) is in threaded connection with a supporting seat (33).
3. A method of reducing subgrade settlement distortion according to claim 2, characterized in that: and the upper surface of the supporting seat (33) is fixedly provided with a barb (34).
4. The method for reducing subgrade settlement deformation according to claim 1, wherein the step of: the section of the ramming layer (11) is isosceles trapezoid, a steel column (4) is inserted into the inclined edge of the ramming layer (11), through holes (41) are uniformly formed in the outer wall of the steel column (4), expansion powder is filled in the through holes (41), and water-soluble films are fixedly mounted at two ends of the through holes (41).
5. The method for reducing subgrade settlement deformation according to claim 1, wherein the steps of: the concrete layer (12) is provided with uniformly distributed pits (51).
6. The method for reducing subgrade settlement deformation according to claim 5, wherein the step of: evenly distributed rubber columns (52) are embedded between the concrete layer (12) and the pavement layer (13).
7. The method for reducing subgrade settlement deformation according to claim 4, wherein the step of: the through holes (41) on the steel columns (4) are gradually enlarged from top to bottom.
8. The method for reducing subgrade settlement deformation according to claim 4, wherein the step of: the expanded powder is contained in a cylindrical expansion bag (42).
9. The method for reducing subgrade settlement deformation according to claim 8, wherein the step of: the material of the expansion bag (42) contains aramid fiber.
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| CN211227915U (en) * | 2019-10-26 | 2020-08-11 | 深圳建中路桥工程有限公司 | Waterproof anti-settlement highway subgrade structure |
| CN214005282U (en) * | 2020-11-10 | 2021-08-20 | 大庆鸿翔工程设计有限公司 | Waterproof anti-settlement highway subgrade structure |
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| US8297874B2 (en) * | 2010-02-26 | 2012-10-30 | Vulcan Materials Company | Traffic bearing structure with permeable pavement |
| US9045865B2 (en) * | 2013-04-19 | 2015-06-02 | SAFEKEY Engineering Technology(Zhengzhou), Ltd. | Polymer grouting method for uplifting ballastless track of high-speed rail |
| CN209652671U (en) * | 2019-01-03 | 2019-11-19 | 湖南省交建工程集团有限公司 | A kind of improvement road structure |
| CN209652670U (en) * | 2019-01-03 | 2019-11-19 | 湖南省交建工程集团有限公司 | It is a kind of can the softening of anti-roadbed road structure |
| CN209584753U (en) * | 2019-01-15 | 2019-11-05 | 张奕宁 | A kind of road structure preventing settlement of highway |
| CN212477293U (en) * | 2020-06-10 | 2021-02-05 | 中电建路桥集团有限公司 | Utilize and strike many packing layers roadbed structure that rolls formation |
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| CN211227915U (en) * | 2019-10-26 | 2020-08-11 | 深圳建中路桥工程有限公司 | Waterproof anti-settlement highway subgrade structure |
| CN214005282U (en) * | 2020-11-10 | 2021-08-20 | 大庆鸿翔工程设计有限公司 | Waterproof anti-settlement highway subgrade structure |
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