CN112982051B - Roadbed suitable for karst landform and construction method - Google Patents
Roadbed suitable for karst landform and construction method Download PDFInfo
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- CN112982051B CN112982051B CN202110196041.2A CN202110196041A CN112982051B CN 112982051 B CN112982051 B CN 112982051B CN 202110196041 A CN202110196041 A CN 202110196041A CN 112982051 B CN112982051 B CN 112982051B
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- 238000010276 construction Methods 0.000 title claims abstract description 88
- 239000004568 cement Substances 0.000 claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000004567 concrete Substances 0.000 claims abstract description 64
- 239000004571 lime Substances 0.000 claims abstract description 63
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 61
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 61
- 239000000945 filler Substances 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 33
- 239000004576 sand Substances 0.000 claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000012423 maintenance Methods 0.000 claims abstract description 22
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000010426 asphalt Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 108
- 239000010959 steel Substances 0.000 claims description 108
- 230000003014 reinforcing effect Effects 0.000 claims description 68
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000012876 topography Methods 0.000 claims 2
- 238000005266 casting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 238000005336 cracking Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
Classifications
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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
-
- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
-
- 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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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Structures (AREA)
Abstract
A roadbed suitable for karst landforms and a construction method belong to the field of road construction and comprise a sand and stone particle layer, a lime cement mixed layer I, a drainage base layer, a buffer layer, a light filler (EPS) layer, a plain soil layer, a lime cement mixed layer II and an asphalt layer. The construction method disclosed by the invention is simple in process and easy to operate, can be used for quickly erecting the roadbed, can be completed by using the existing construction equipment, and solves the problem of short service life of the existing karst landform road. And can receive the data of concrete structure construction through the signal receiving amplifier, consolidate the adjustment to in the road maintenance stage, can also receive the concrete structure of return water channel both sides and the water level condition in the return water channel.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a roadbed suitable for karst landforms and a construction method.
Background
Karst landforms, named as karst plateau of sulwennia, are also called karst landforms in china, which are one of five major forms of landforms in china. The karst landform is divided into two major categories, namely the earth surface and the underground, wherein the earth surface is provided with a stone bud, a dissolving ditch, a karst funnel, a water falling hole, a dissolving depression, a karst basin, a karst plain, a peak cluster, needle karst and an isolated peak; underground has karst cave and underground river and dark lake. Karst landforms are most widely distributed in China and are intensively distributed in areas of Gui, qian, yunnan and other provinces, and areas of Chuan, yu, xiang, jin, ganzhong and Tibetan and other provinces are also distributed. Karst landforms are predominantly distributed in the rest of the world in the bolblack denna mountain area, the central plateau in france, russia urala mountain area, south australia, the middle eastern united states, the great security of the islands of the column and the middle north vietnam.
Patent 201510162456.2 discloses a method for constructing a tower foundation pit in a karst landform foundation rainy season, which is characterized in that: digging a foundation pit by adopting a water mill drill or step alternating blasting, embedding a PVC water guide pipe in the construction of a foundation pit retaining wall, and wrapping a pipe orifice by adopting a dry straw and fine sand net; dividing the accumulated water into serious, medium and general, and excavating a karst landform foundation pit with serious accumulated water by adopting a clear drainage method; for a karst landform foundation pit with medium ponding, a funnel lifting underwater pouring concrete method is adopted for concrete pouring; for a karst landform foundation pit with water accumulation, a hanging ladle water pumping pouring concrete method is adopted for concrete pouring. The method can effectively improve the construction efficiency of the foundation pit at the tower position, improve the construction safety and avoid the falling and collapse in the construction process of the foundation pit.
The patent 201610824112.8 discloses a karst landform tunnel bead-shaped annular continuous karst cave treatment method, which is characterized in that emergency treatment measures, primary support treatment of a vault karst cave, primary support treatment of a left arch foot karst cave and primary support treatment of a right arch waist karst cave are respectively carried out.
Patent 202020022251.0 discloses a karst landform karst cave district section road bed stone side conveyer. The karst landform karst cave section roadbed rock transportation device comprises a supporting plate; the fixing mechanism comprises a fixing plate, a protruding block, a compression plate, a first supporting rod, a second supporting rod, a spring and a storage groove; the top surface of the supporting plate is provided with the fixing plate, and the side wall of the fixing plate is provided with the storage groove; the bottom surface of the supporting plate is provided with the second supporting rods at equal intervals, the inside of the second supporting rods is connected with the first supporting rods in a sliding mode, and the bottom surface of the first supporting rods is provided with the compression plate with the side wall being arc-shaped; the spring is arranged in the second supporting rod and is connected with the first supporting rod; the top surface of the supporting plate is provided with the convex blocks with arc side walls; a connecting mechanism; and a limiting mechanism. The karst landform karst cave section roadbed stone transportation device provided by the utility model can prevent stones from falling.
However, since there are many gaps in karst landform, the rainwater is large. In the use process of the road surface, the vehicle runs on the road surface to cause long-time vibration, the rainfall is large, and after long-time use, the sinking and sedimentation of the road surface are easy to form, namely the service life of the road surface with karst landform is obviously lower than that of a common plain area. The roadbed formed by the traditional construction method of the karst landform pavement in the prior art is temporary in rainy season, is easy to collapse and has short service life. Therefore, the novel karst landform roadbed construction method can prolong the service life of the road, has better drainage property, needs to improve the construction progress by adopting the novel construction method in the construction process and is convenient for timely maintenance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a karst landform roadbed construction method, which is characterized in that the service life of the karst landform roadbed is finally prolonged and the problem of short service life of the karst landform roadbed is successfully solved through paving a sand stone particle layer, a lime cement mixed layer I, a drainage base layer, a buffer layer, a light filler EPS layer, a plain soil layer, a lime cement mixed layer II and an asphalt layer.
The invention is realized by the following technical scheme that the roadbed suitable for karst landforms comprises a sand and stone particle layer, a lime-cement mixed layer I, a drainage base layer, a buffer layer, a light filler EPS layer, a plain soil layer, a lime-cement mixed layer II and an asphalt layer,
The sand particle layer is downward 10cm and is an underground horizontal water level line of karst landform,
A sand particle layer is paved below the lime cement mixing layer I,
The lime cement mixed layer I is laid under the drainage base layer,
The drainage base layer is laid under the buffer layer,
The buffer layer is laid under the light filler EPS layer,
Two sides of the light filler EPS layer are provided with a concrete reinforcing layer II,
The light filler EPS layer is laid under the plain soil layer,
The plain soil layer is laid under the lime cement mixed layer II,
And the lime cement mixed layer II is laid below the asphalt layer. The method adopts the paving of a sand particle layer, a lime-cement mixed layer I, a drainage base layer, a buffer layer, a light filler EPS layer, a plain soil layer, a lime-cement mixed layer II and an asphalt layer. The influence of water flow in underground river and dark lake can be eliminated through the sand particle layer. The lime cement mixed layer I and the lime cement mixed layer II adopt the proportion of cement, lime and clay as 5:10:85. The compactness of each of the lime cement mixed layer I and the lime cement mixed layer II is greater than 96%. The compressive property of the roadbed can be improved by adopting the lime cement mixed layer I and the lime cement mixed layer II without reducing the drainage property of the roadbed. The concrete reinforcing layers II are arranged on the two sides of the light filler (EPS) layer, so that water and soil loss of the roadbed caused by long-time flushing in rainy seasons can be effectively avoided.
Preferably, the drainage base layer comprises a concrete reinforcing layer I and a water return channel, wherein the concrete reinforcing layer I is arranged on two sides of the water return channel, and the water return channel comprises a steel wire mesh, U-shaped steel, reinforcing ribs, a light steel supporting plate, a light steel supporting column, a water level detector, a generator fixing frame and an anti-skid base; the top of the drainage base layer is provided with a light steel supporting plate, and the lower part of the light steel supporting plate is provided with a light steel supporting column; the outer side of the light steel support column is provided with a generator fixing frame; a miniature ultrasonic generator is arranged on the generator fixing frame; a water level detector is also arranged on the light steel support column; an anti-skid base is arranged at the bottom of the light steel support column; the upper part of the light steel supporting plate is provided with a reinforcing structure formed by interweaving steel wire meshes with U-shaped steel and reinforcing ribs; the buffer layer is arranged on the upper part of the reinforcing structure; the backwater channel is connected with drainage ditches at two sides of the roadbed; the lower part of the light steel supporting plate is fixedly provided with a miniature signal receiving amplifier which is connected with the water level detector in a wireless way, and the miniature signal receiving amplifier is connected with the miniature ultrasonic generator in a wireless way; the periphery of the miniature signal receiving amplifier is provided with a waterproof structure. The drainage of the drainage base layer can be greatly increased through the arrangement of the internal water return channel, the bearing pressure on the water return channel can be greatly increased through the arrangement of the reinforcing structure, the collapse of the water return channel is avoided, and the anti-cracking performance of the roadbed can be increased through the arrangement of the buffer layer; the construction information of the water level and the concrete structure can be received through the arrangement of the miniature signal receiving amplifier; in the construction stage, the signals of the miniature signal receiving amplifier are received through peripheral communication equipment, namely, the construction conditions of water level and concrete are safely and conveniently monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to be closed, so that the miniature signal receiving amplifier can be opened at any time when maintenance is needed, and the concrete structure and the water level condition at two sides of the water return channel are monitored.
Preferably, the water return channel is internally provided with a supporting structure, and the supporting structure comprises a supporting shaft, a bearing top plate, an adjusting clamping structure, a bearing base, a bearing top plate groove and a bearing base groove; the support structures are uniformly arranged in the water return channel at intervals along the road paving direction; the upper part of the bearing top plate is contacted with the light steel supporting plate; the adjusting clamping structure can enable the bearing top plate to move up and down through rotation; an elastic component is arranged in the pipe fitting between the bearing top plate and the adjusting clamping structure; the elastic component can finely tune the distance between the bearing top plate and the adjusting clamping structure. Through bearing structure's setting, be convenient for erect the water return channel at the construction stage and increased the precipitation volume and when big, the compressive capacity of water return channel is through adjusting screens structure and adjusting bearing structure's vertical height, satisfies different road conditions construction demands. The supporting force can be saved to a certain extent through the arrangement of the high-strength elastic component.
Preferably, in the reinforcing structure, the steel wire mesh is arranged in a shape of a Chinese character 'mi', the reinforcing ribs are uniformly arranged along the road paving direction, the U-shaped steel is uniformly arranged along the direction perpendicular to the road paving direction, the reinforcing ribs are made of metal materials, and the steel wire mesh, the U-shaped steel and the reinforcing ribs are connected together through welding. The strength of the reinforced structure can be improved by the arrangement of the steel wire meshes in the shape of the Chinese character 'mi', the specific arrangement mode of the reinforcing ribs and the U-shaped steel. The reinforcing ribs are uniformly distributed along the road paving direction, so that the pressure of the road can be uniformly spread.
Preferably, the lime-cement mixed layer I and the lime-cement mixed layer II are formed by mixing lime and cement, and the compression modulus of the lime-cement mixed layer I and the lime-cement mixed layer II is Es and is not less than 3MPa; the buffer layer can be one of CA mortar and EVA rubber sheets; the thickness of the buffer layer is 10-20cm; the compression modulus of the buffer layer is Es, and Es is more than or equal to 0.5MPa and less than or equal to 0.7MPa. The arrangement of the lime cement mixed layer I and the lime cement mixed layer II greatly enhances the compression resistance of the roadbed, and meanwhile, the drainage property of the roadbed is not reduced.
Preferably, the anti-skid base comprises a bottom fixing device and a rotating shaft positioned in the middle of the bottom fixing device, and a light steel support column is sleeved on the rotating shaft; the anti-skid base is positioned in the lime cement mixing layer I. The light steel support column can be fixed through the arrangement of the anti-skid base embedded in and fixed on the lime cement mixed layer I.
In addition, a construction method of the roadbed suitable for karst landforms is provided:
Step 1: uniformly paving a sand particle layer on the settled pavement, wherein the sand particle layer is about to be 10cm above the underground level uniform water line of the karst landform;
step 2: paving a lime-cement mixed layer I on the stone particle layer, wherein the lime-cement mixed layer I is paved by adopting lime and cement in multiple layers at intervals, the thickness of the lime-cement mixed layer I is 25-30cm, and a road roller repeatedly rolls and compacts the lime-cement mixed layer I on the lime-cement mixed layer I;
step 3: erecting the drainage base layer on the lime-cement mixed layer I, erecting the support structures of the water return channels at intervals along the road construction direction, burying the anti-skid base in the lime-cement mixed layer I at intervals, and connecting light steel support columns on the anti-skid base; erecting a light steel supporting plate on the bearing top plate, and fixing the bearing top and the light steel supporting plate; laying a steel wire mesh, U-shaped steel and reinforcing ribs on the light steel support plate, firstly arranging the steel wire mesh in a meter shape, then uniformly arranging the reinforcing ribs along the road laying direction, and then uniformly arranging the U-shaped steel along the direction perpendicular to the road laying direction; welding and fixing the steel wire mesh, the U-shaped steel and the reinforcing ribs; concrete structures are poured on two sides of the water return channel; the upper surface of the concrete structure is leveled with the water return channel horizontal plane;
Step 4: paving a buffer layer on the drainage base layer, wherein the thickness of the buffer layer is 10-20cm; performing rolling pressure test, wherein the compression modulus of the buffer layer is Es, and Es is more than or equal to 0.5MPa and less than or equal to 0.7MPa;
Step 5: paving a light filler (EPS) layer on the buffer layer, wherein the thickness of the light filler layer is 10-20cm, and repeatedly rolling and compacting the road roller on the light filler layer; paving concrete reinforcing layers II on two sides of the light filler (EPS) layer; the thickness of the concrete reinforcing layer II is consistent with that of the light filler layer;
Step 6: paving an plain soil layer on the light filler (EPS) layer; the thickness of the plain soil layer is 10-15cm, and the roller repeatedly rolls and compacts the plain soil layer;
step 7: paving a lime cement mixed layer II on the plain soil layer; the thickness of the lime cement mixed layer II is 10-15cm, and the roller repeatedly rolls and compacts the lime cement mixed layer II;
Step 8: and paving an asphalt layer on the lime cement mixed layer II.
Through the arrangement of the construction steps, the construction method of the roadbed applicable to the karst landform can be applicable to new roadbed construction, the construction method is simple in process and easy to operate, the roadbed can be quickly erected, the existing construction equipment can be used for completing the construction, and the problem that the service life of the existing karst landform road is short is solved. And can receive the data of concrete structure construction through the signal receiving amplifier, consolidate the adjustment to in the road maintenance stage, can also receive the concrete structure of return water channel both sides and the water level condition in the return water channel. The invention is beneficial to realizing the construction and maintenance of karst landforms, and provides reference value and reference significance for roadbed construction with other similar geological conditions.
Preferably, the sand and stone particle layer in the step 1 is paved by crushed stones with the diameter of 8-10 cm, and the compressive strength of the sand and stone particle layer is not less than 22MPa; and (3) the compressive strength of the concrete structure poured in the step (3) is not less than 10MPa. The sand particle layer can exclude the influence of water flow of underground river and dark lake. The strength of the roadbed is improved through the concrete structure, the concrete reinforcing layer I and the concrete reinforcing layer II. The concrete reinforcing layer II is arranged on two sides of the light filler (EPS) layer, so that the loss of the light filler (EPS) layer can be prevented, the service life of the roadbed is greatly prolonged, and the construction technology is innovative compared with the construction technology in the prior art.
Preferably, in step 3, a water level detector is further disposed on the light steel support column; the outer side of the light steel support column is provided with a generator fixing frame; a miniature ultrasonic generator is arranged on the generator fixing frame; in the construction stage, the peripheral communication equipment receives signals of the miniature signal receiving amplifier, so that the water level and the construction condition of the concrete can be monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to close the equipment, so that the miniature signal receiving amplifier can be opened at any time to receive corresponding signals when maintenance is needed, and the concrete structures and water level conditions on two sides of the water return channel are monitored. The construction information of the water level and the concrete structure can be received through the arrangement of the miniature signal receiving amplifier; in the construction stage, the peripheral communication equipment receives signals of the miniature signal receiving amplifier, so that the water level and the construction condition of the concrete can be monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to be closed, so that the miniature signal receiving amplifier can be opened at any time when maintenance is needed, and the concrete structure and the water level condition at two sides of the water return channel are monitored. Compared with the prior art, the pavement condition can be detected when needed, whether maintenance is carried out or not is selected according to the specific actual use condition of the pavement, and the maintenance cost is greatly saved. Preferably, the buffer layer in the step 4 may be composed of two layers of 10mm thick CA mortar and EVA rubber sheets laid in a staggered manner. The anti-cracking property of the roadbed can be improved through the arrangement of the buffer layer; construction time can be saved through laying of fashioned EVA rubber sheet, promotes the construction progress greatly.
The beneficial effects of the invention are as follows:
The construction method is simple in process, easy to operate, capable of quickly erecting the roadbed and capable of being completed by using existing construction equipment, and solves the problem that an existing karst landform road is short in service life. The strength of the roadbed is improved through the concrete structure, the concrete reinforcing layer I and the concrete reinforcing layer II. The anti-cracking property of the roadbed can be improved through the arrangement of the buffer layer; through bearing structure's setting, be convenient for erect the return water way and increased the compressive capacity of return water way at the construction stage, through adjusting screens structure and adjusting bearing structure's vertical height, satisfy different road conditions construction demands. The supporting force can be saved to a certain extent through the arrangement of the high-strength elastic component. The strength of the reinforced structure can be improved by the arrangement of the steel wire meshes in the shape of the Chinese character 'mi', the specific arrangement mode of the reinforcing ribs and the U-shaped steel. The reinforcing ribs are uniformly distributed along the road paving direction, so that the pressure of the road can be uniformly spread. The arrangement of the lime cement mixed layer I and the lime cement mixed layer II greatly enhances the compression resistance of the roadbed, and meanwhile, the drainage property of the roadbed is not reduced.
The concrete reinforcing layer II is arranged on two sides of the light filler EPS layer, so that loss of the light filler (EPS) layer can be prevented, and the service life of the roadbed is greatly prolonged. The miniature signal receiving amplifier can be opened at any time when maintenance is needed, and the concrete structure and the water level condition at two sides of the water return channel are monitored. Compared with the prior art, the pavement condition can be detected when needed, whether maintenance is carried out or not is selected according to the specific actual use condition of the pavement, and the maintenance cost is greatly saved. The anti-cracking property of the roadbed can be improved through the arrangement of the buffer layer; construction time can be saved through laying of fashioned EVA rubber sheet, promotes the construction progress greatly. The invention is beneficial to realizing the construction and maintenance of karst landforms, and provides reference value and reference significance for roadbed construction with other similar geological conditions.
Drawings
FIG. 1 is a schematic view of a roadbed structure according to the present invention;
FIG. 2 is a partial top view of the water return channel of the present invention;
FIG. 3 is a plan view of the water return channel of the present invention;
FIG. 4 is a schematic view of the support structure in the sewer of the present invention;
fig. 5 is a schematic view of the construction flow of the present invention.
In the figure: 1-steel wire mesh, 2-U-shaped steel, 3-reinforcing ribs, 4-light steel supporting plates, 5-light steel supporting columns, 6-water level detectors, 7-generator fixing frames, 8-anti-skid bases, 9-sand particle layers, 10-drainage base layers, 11-buffer layers, 13-light filler (EPS) layers, 15-supporting shafts, 16-bearing top plates, 17-adjusting clamping structures, 18-bearing bases, 19-bearing top plate grooves, 20-bearing base grooves, 22-lime cement mixed layers I, 23-lime cement mixed layers II, 24-plain soil layers and 25-asphalt layers.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1: as shown in fig. 1-4, the roadbed suitable for karst landforms comprises a sand and stone particle layer 9, a lime-cement mixed layer I22, a drainage base layer 10, a buffer layer 11, a light filler EPS layer 13, a plain soil layer 24, a lime-cement mixed layer II23 and an asphalt layer, wherein the sand and stone particle layer 9 is 10cm downwards and is an underground level water-equalizing line of the karst landforms,
A sand particle layer 9 is paved below the lime cement mixed layer I22,
The lime cement mixed layer I22 is laid under the drainage base layer 10,
The drainage base layer 10 is laid under the buffer layer 11,
The buffer layer 11 is laid under the light filler EPS layer 13,
Concrete reinforcing layers II are arranged on two sides of the light filler EPS layer 13, the light filler EPS layer 13 is laid under the plain soil layer 24,
The plain soil layer 24 is laid under the lime cement mixed layer II23,
And the lime cement mixed layer II23 is laid below the asphalt layer. The sand and stone particle layer 9, the lime-cement mixed layer I22, the drainage base layer 10, the buffer layer 11, the light filler EPS layer 13, the plain soil layer 24, the lime-cement mixed layer II23 and the asphalt layer are paved. The influence of the water flow in the underground river and the dark lake can be eliminated through the sand particle layer 9. The lime cement mixed layer I22 and the lime cement mixed layer II23 adopt the proportion of cement, lime and clay of 5:10:85. The compactness of the lime cement mixed layer I22 and the lime cement mixed layer II23 is greater than 96%. The lime cement mixed layer I22 and the lime cement mixed layer II23 are adopted, so that the compression resistance of the roadbed can be improved, and the drainage of the roadbed is not reduced. The concrete reinforcing layers II are arranged on the two sides of the light filler EPS layer, so that water and soil loss of the roadbed caused by long-time flushing in rainy seasons can be effectively avoided.
Example 2: other structures are the same as those of the embodiment 1, on the basis of the embodiment 1, the drainage base layer 10 comprises a concrete reinforcing layer I and water return channels, the concrete reinforcing layer I is arranged on two sides of the water return channels, and the water return channels comprise a steel wire mesh 1, a U-shaped steel 2, reinforcing ribs 3, a light steel support plate 4, a light steel support column 5, a water level detector 6, a generator fixing frame 7 and an anti-skid base 8; the top of the drainage base layer 10 is provided with a light steel supporting plate 4, and the lower part of the light steel supporting plate 4 is provided with a light steel supporting column 5; the outer side of the light steel support column 5 is provided with a generator fixing frame 7; a miniature ultrasonic generator is arranged on the generator fixing frame 7; the light steel support column 5 is also provided with a water level detector 6; an anti-skid base 8 is arranged at the bottom of the light steel support column 5; the upper part of the light steel supporting plate 4 is provided with a reinforcing structure formed by interweaving a steel wire mesh 1 with a U-shaped steel 2 and reinforcing ribs 3; the upper part of the reinforcing structure is provided with the buffer layer 11; the backwater channel is connected with drainage ditches at two sides of the roadbed; the lower part of the light steel supporting plate 4 is fixedly provided with a miniature signal receiving amplifier which is connected with the water level detector 6 in a wireless way, and the miniature signal receiving amplifier is connected with the miniature ultrasonic generator in a wireless way; the periphery of the miniature signal receiving amplifier is provided with a waterproof structure. The drainage performance of the drainage base layer 10 can be greatly increased through the arrangement of the internal water return channel, the bearing pressure on the water return channel can be greatly increased through the arrangement of the reinforcing structure, the water return channel is prevented from being collapsed, and the anti-cracking performance of the roadbed can be increased through the arrangement of the buffer layer 11; the construction information of the water level and the concrete structure can be received through the arrangement of the miniature signal receiving amplifier; in the construction stage, the peripheral communication equipment receives signals of the miniature signal receiving amplifier, so that the water level and the construction condition of the concrete can be monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to be closed, so that the miniature signal receiving amplifier can be opened at any time when maintenance is needed, and the concrete structure and the water level condition at two sides of the water return channel are monitored.
Example 3: other structures are the same as those of the embodiment 2, and on the basis of the embodiment 2, a supporting structure is further arranged in the water return channel, and comprises a supporting shaft 15, a bearing top plate 16, an adjusting clamping structure 17, a bearing base 18, a bearing top plate groove 19 and a bearing base groove 20; the support structures are uniformly arranged in the water return channel at intervals along the road paving direction; the upper part of the bearing top plate 16 contacts with the light steel supporting plate 4; the adjusting clamping structure 17 rotates to enable the bearing top plate 16 to move up and down; an elastic component is arranged in the pipe fitting between the bearing top plate 16 and the adjusting clamping structure 17; the elastic assembly allows fine tuning of the distance between the load-bearing top plate 16 and the adjustment detent structure 17. Through bearing structure's setting, be convenient for erect the return water way and increased the compressive capacity of return water way at the construction stage, adjust bearing structure's vertical height through adjusting screens structure 17, satisfy different road conditions construction demands. The supporting force can be saved to a certain extent through the arrangement of the high-strength elastic component.
Example 4: other structures are the same as embodiment 2, on the basis of embodiment 2, in the reinforcing structure, the steel wire mesh 1 is the rice style of calligraphy and arranges, the strengthening rib 3 is evenly arranged along the road direction of laying, the U-shaped steel 2 is evenly arranged along the direction of laying perpendicular to road, the strengthening rib 3 is the metal material, the steel wire mesh 1, U-shaped steel 2, strengthening rib 3 are in the same place through welded connection. The strength of the reinforcing structure can be improved through the specific arrangement mode of the steel wire mesh 1 in the shape of the Chinese character 'mi', the reinforcing ribs 3 and the U-shaped steel 2. The reinforcing ribs 3 are uniformly distributed along the road paving direction, so that the pressure of the road can be uniformly spread.
Example 5: other structures are the same as those of the embodiment 1, on the basis of the embodiment 1, the lime-cement mixed layer I22 and the lime-cement mixed layer II23 are formed by mixing lime and cement, and the compression modulus of the lime-cement mixed layer I22 and the lime-cement mixed layer II23 is Es not less than 3MPa; the buffer layer 11 can be one of CA mortar and EVA rubber sheets; the thickness of the buffer layer 11 is 10-20cm; the compression modulus of the buffer layer 11 is Es, and the Es satisfies 0.5MPa or more and is not more than 0.7MPa or less. The arrangement of the lime cement mixed layer I22 and the lime cement mixed layer II23 greatly enhances the compression resistance of the roadbed, and meanwhile, the drainage property of the roadbed is not reduced.
Example 6: other structures are the same as those of the embodiment 2, and on the basis of the embodiment 2, the anti-skid base 8 comprises a bottom fixing device and a rotating shaft positioned in the middle of the bottom fixing device, and a light steel support column 5 is sleeved on the rotating shaft; the anti-slip base 8 is positioned in the lime cement mixed layer I22. The light steel support column 5 can be fixed through the arrangement that the anti-skid base 8 is buried and fixed in the lime cement mixed layer I22. As to the road construction method, as shown in fig. 5, the present invention provides a construction method for a roadbed suitable for karst landforms:
step 1: uniformly paving a sand particle layer 9 on the settled pavement, wherein the sand particle layer 9 is about to be 10cm above the underground level uniform water line of the karst landform;
Step 2: paving a lime-cement mixed layer I22 on the stone particle layer, wherein the lime-cement mixed layer I22 is paved by adopting lime and cement in multiple layers at intervals, the thickness of the lime-cement mixed layer I22 is 25-30cm, and a road roller repeatedly rolls and compacts the lime-cement mixed layer I22;
Step 3: erecting the drainage base layer 10 on the lime-cement mixed layer I22, firstly erecting a supporting structure of the water return channel, burying the anti-skid base 8 in the lime-cement mixed layer I22 at intervals, and connecting the anti-skid base 8 with a light steel supporting column 5; erecting a light steel supporting plate 4 on the bearing top plate 16, and fixing the bearing top and the light steel supporting plate 4; laying a steel wire mesh 1, U-shaped steel materials 2 and reinforcing ribs 3 on the light steel support plate 4, firstly arranging the steel wire mesh 1 in a meter shape, then uniformly arranging the reinforcing ribs 3 along the road laying direction, and then uniformly arranging the U-shaped steel materials 2 along the direction perpendicular to the road laying direction; welding and fixing the steel wire mesh 1, the U-shaped steel 2 and the reinforcing ribs 3; concrete structures are poured on two sides of the water return channel; the upper surface of the concrete structure is leveled with the water return channel horizontal plane;
Step 4: paving a buffer layer 11 on the drainage base layer 10, wherein the thickness of the buffer layer 11 is 10-20cm; performing rolling pressure test, wherein the compression modulus of the buffer layer 11 is Es, and the Es is more than or equal to 0.5MPa and less than or equal to 0.7MPa;
Step 5: paving a light filler (EPS) layer 13 on the buffer layer 11, wherein the thickness of the light filler layer is 10-20cm, and repeatedly rolling and compacting the road roller on the light filler layer; paving a concrete reinforcing layer II on two sides of the light filler (EPS) layer 13; the thickness of the concrete reinforcing layer II is consistent with that of the light filler layer;
step 6: laying a layer of plain soil 24 on said layer of light filler (EPS) 13; the thickness of the plain soil layer 24 is 10-15cm, and the roller repeatedly rolls and compacts the plain soil layer;
step 7: paving a lime cement mixed layer II23 on the plain soil layer 24; the thickness of the lime cement mixed layer II23 is 10-15cm, and the roller repeatedly rolls and compacts the lime cement mixed layer II;
step 8: and paving an asphalt layer on the lime cement mixed layer II 23.
Through the arrangement of the construction steps, the construction method of the roadbed applicable to the karst landform can be applicable to new roadbed construction, the construction method is simple in process and easy to operate, the roadbed can be quickly erected, the existing construction equipment can be used for completing the construction, and the problem that the service life of the existing karst landform road is short is solved. And can receive the data of concrete structure construction through the signal receiving amplifier 21, consolidate the adjustment to in the road maintenance stage, can also receive the concrete structure of return water channel both sides and the water level condition in the return water channel. The invention is beneficial to realizing the construction and maintenance of karst landforms, and provides reference value and reference significance for roadbed construction with other similar geological conditions.
Preferably, the sand and stone particle layer 9 in the step 1 is paved by crushed stones with the diameter of 8-10 cm, and the compressive strength of the sand and stone particle layer 9 is not less than 22MPa; and (3) the compressive strength of the concrete structure poured in the step (3) is not less than 10MPa. The layer of sand particles 9 can exclude the influence of the water flow of the underground river and the dark lake. The strength of the roadbed is improved through the concrete structure, the concrete reinforcing layer I and the concrete reinforcing layer II. The concrete reinforcing layer II is arranged on two sides of the light filler (EPS) layer 13, so that the loss of the light filler (EPS) layer 13 can be prevented, the service life of the roadbed is greatly prolonged, and compared with the construction technology in the prior art, the construction technology is innovative.
Preferably, in step 3, a water level detector 6 is further disposed on the light steel support column 5; the outer side of the light steel support column 5 is provided with a generator fixing frame 7; a miniature ultrasonic generator is arranged on the generator fixing frame 7; in the construction stage, the signals received by the miniature signal receiving amplifier are checked through peripheral communication equipment, so that the water level and the construction condition of the concrete can be monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to be closed, and the miniature signal receiving amplifier can be opened at any time to receive corresponding signals when maintenance is needed, so that the concrete structure and the water level condition at two sides of the water return channel are monitored. Compared with the prior art, the pavement condition can be detected when needed, whether maintenance is carried out or not is selected according to the specific actual use condition of the pavement, and the maintenance cost is greatly saved. As the roadbed maintenance period in the karst landform area is relatively short and the conditions of each road section are not completely the same, the maintenance cost can be greatly reduced by arranging the detection structure.
Preferably, the buffer layer 11 in the step 4 may be composed of two layers of CA mortar and EVA rubber sheets with a thickness of 10mm which are laid in a staggered manner. The anti-cracking property of the roadbed can be increased through the arrangement of the buffer layer 11; construction time can be saved through laying of fashioned EVA rubber sheet, promotes the construction progress greatly.
Claims (6)
1. The roadbed is characterized by comprising a sand particle layer, a lime cement mixed layer I, a drainage base layer, a buffer layer, a light filler EPS layer, an plain soil layer, a lime cement mixed layer II and an asphalt layer, wherein the sand particle layer is downwards 10cm an underground horizontal water level line of the karst landform, the sand particle layer is paved under the lime cement mixed layer I, the lime cement mixed layer I is paved under the drainage base layer, the drainage base layer is paved under the buffer layer, the buffer layer is paved under the light filler EPS layer, concrete reinforcing layers II are arranged on two sides of the light filler EPS layer, the light filler EPS layer is paved under the plain soil layer, the plain soil layer is paved under the lime cement mixed layer II, and the lime cement mixed layer II is paved under the asphalt layer;
The drainage base layer comprises a concrete reinforcing layer I and a water return channel, wherein the concrete reinforcing layer I is arranged on two sides of the water return channel, and the water return channel comprises a steel wire mesh, U-shaped steel, reinforcing ribs, a light steel supporting plate, a light steel supporting column, a water level detector, a generator fixing frame and an anti-skid base; the top of the drainage base layer is provided with a light steel supporting plate, and the lower part of the light steel supporting plate is provided with a light steel supporting column; the outer side of the light steel support column is provided with a generator fixing frame; a miniature ultrasonic generator is arranged on the generator fixing frame; a water level detector is also arranged on the light steel support column; an anti-skid base is arranged at the bottom of the light steel support column; the upper part of the light steel supporting plate is provided with a reinforcing structure formed by interweaving steel wire meshes with U-shaped steel and reinforcing ribs; the buffer layer is arranged on the upper part of the reinforcing structure; the backwater channel is connected with drainage ditches at two sides of the roadbed; the lower part of the light steel supporting plate is fixedly provided with a miniature signal receiving amplifier which is connected with the water level detector in a wireless way, and the miniature signal receiving amplifier is connected with the miniature ultrasonic generator in a wireless way; the periphery of the miniature signal receiving amplifier is provided with a waterproof structure;
The back water channel is internally provided with a supporting structure, and the supporting structure comprises a supporting shaft, a bearing top plate, an adjusting clamping structure, a bearing base, a bearing top plate groove and a bearing base groove; the support structures are uniformly arranged in the water return channel at intervals along the road paving direction; the upper part of the bearing top plate is contacted with the light steel supporting plate; the rotation of the adjusting clamping structure can enable the bearing top plate to move up and down; an elastic component is arranged in the pipe fitting between the bearing top plate and the adjusting clamping structure; the elastic component can finely adjust the distance between the bearing top plate and the adjusting clamping structure;
In the reinforced structure, the steel wire mesh is arranged in a rice shape, the reinforcing ribs are uniformly arranged along the road paving direction, the U-shaped steel is uniformly arranged along the direction perpendicular to the road paving direction, the reinforcing ribs are made of metal materials, and the steel wire mesh, the U-shaped steel and the reinforcing ribs are connected together through welding.
2. The roadbed applicable to karst landforms of claim 1, wherein the lime-cement mixed layer I and the lime-cement mixed layer II are formed by mixing lime and cement, and the compression modulus of the lime-cement mixed layer I and the lime-cement mixed layer II is Es not less than 3MPa; the buffer layer adopts one of CA mortar and EVA rubber sheets; the thickness of the buffer layer is 10-20cm; the compression modulus of the buffer layer is Es, and Es is more than or equal to 0.5MPa and less than or equal to 0.7MPa.
3. The roadbed applicable to karst topography according to claim 2, wherein the anti-skid base comprises a bottom fixing device, a rotating shaft positioned in the middle of the bottom fixing device, and a light steel support column sleeved on the rotating shaft; the anti-skid base is positioned in the lime cement mixing layer I.
4. A construction method for a roadbed applicable to karst landforms according to any one of claims 2 to 3, characterized in that the construction method is implemented by the steps of:
Step 1: uniformly paving a sand particle layer on the settled pavement, wherein the sand particle layer is about to be 10cm above the underground level uniform water line of the karst landform;
Step 2: paving a lime-cement mixed layer I on the sand particle layer, wherein the lime-cement mixed layer I is paved by adopting lime and cement layers at intervals, the thickness of the lime-cement mixed layer I is 25-30cm, and a road roller repeatedly rolls and compacts the lime-cement mixed layer I on the lime-cement mixed layer I;
Step 3: erecting the drainage base layer on the lime-cement mixed layer I, erecting the support structures of the water return channels at intervals along the road construction direction, burying the anti-skid base in the lime-cement mixed layer I at intervals, and connecting light steel support columns on the anti-skid base; erecting a light steel supporting plate on the bearing top plate, and fixing the bearing top plate and the light steel supporting plate; laying a steel wire mesh, U-shaped steel and reinforcing ribs on the light steel support plate, firstly arranging the steel wire mesh in a meter shape, then uniformly arranging the reinforcing ribs along the road laying direction, and then uniformly arranging the U-shaped steel along the direction perpendicular to the road laying direction; welding and fixing the steel wire mesh, the U-shaped steel and the reinforcing ribs; casting a concrete reinforcing layer I on two sides of the water return channel; the upper surface of the concrete reinforcing layer I is leveled with the water return channel horizontal plane;
Step 4: paving a buffer layer on the drainage base layer, wherein the thickness of the buffer layer is 10-20cm; performing rolling pressure test, wherein the compression modulus of the buffer layer is Es, and Es is more than or equal to 0.5MPa and less than or equal to 0.7MPa;
Step 5: paving a light filler EPS layer on the buffer layer, wherein the thickness of the light filler EPS layer is 10-20cm, and repeatedly rolling and compacting the road roller on the light filler EPS layer; paving concrete reinforcing layers II on two sides of the light filler EPS layer; the thickness of the concrete reinforcing layer II is consistent with that of the light filler EPS layer;
Step 6: paving an plain soil layer on the light filler EPS layer; the thickness of the plain soil layer is 10-15cm, and the roller repeatedly rolls and compacts the plain soil layer;
step 7: paving a lime cement mixed layer II on the plain soil layer; the thickness of the lime cement mixed layer II is 10-15cm, and the roller repeatedly rolls and compacts the lime cement mixed layer II;
Step 8: and paving an asphalt layer on the lime cement mixed layer II.
5. The construction method for the roadbed applicable to karst landforms according to claim 4, wherein the sand and stone particle layer in the step 1 is paved by broken stone with the diameter of 8-10 cm, and the compressive strength of the sand and stone particle layer is not less than 22MPa; and (3) the compressive strength of the concrete reinforcing layer I poured in the step (3) is not less than 10MPa.
6. The construction method for the roadbed applicable to karst topography according to claim 4, wherein in step 3, a water level detector is further provided on the light steel support column; the outer side of the light steel support column is provided with a generator fixing frame; a miniature ultrasonic generator is arranged on the generator fixing frame; in the construction stage, the signals received by the miniature signal receiving amplifier are checked through peripheral communication equipment, so that the water level and the construction condition of the concrete can be monitored; after the construction is finished, the peripheral communication equipment sends out an instruction to enable the miniature signal receiving amplifier to be closed, and the miniature signal receiving amplifier can be opened at any time to receive corresponding signals when maintenance is needed, so that the concrete reinforcing layer I and the water level condition at two sides of the water return channel are monitored.
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