CN218580376U

CN218580376U - Structure for preventing roadbed from softening

Info

Publication number: CN218580376U
Application number: CN202222484011.4U
Authority: CN
Inventors: 张强
Original assignee: BCEG Civil Engineering Co Ltd
Current assignee: BCEG Civil Engineering Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-03-07
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a prevent soft structure of road bed belongs to the road bed and maintains technical field. The structure for preventing the subgrade from softening comprises an upper soil interlayer stone, an upper emulsified asphalt layer, a core-spun mud rock layer, a lower emulsified asphalt layer, a lower soil interlayer stone, a base flaky stone cushion layer, an upper anti-seepage geotextile and a lower anti-seepage geotextile; the core-spun mud rock stratum on arrange upper emulsified asphalt layer, set up upper soil on the upper emulsified asphalt layer and press from both sides the stone, concrete pavement structure is laid on upper soil presss from both sides the stone, the downside on core-spun mud rock stratum is lower floor's emulsified asphalt layer, lower floor's emulsified asphalt layer has set lower soil and presss from both sides the stone, the tiling has base plate piece stone bed course below the lower soil presss from both sides the stone. The utility model discloses can effectually avoid the contact of core-spun mudstone and air and rainwater, prevent the morals and manners of mudstone, solve the mudstone and met the problem that water softening disintegrates, the humidifying warp, improved the tightness of road bed.

Description

Structure for preventing roadbed from softening

Technical Field

The utility model belongs to the technical field of the structure is maintained to the road bed, specific theory relates to a prevent structure that the road bed is softened.

Background

The roadbed is a strip-shaped structure which is built according to route positions and certain technical requirements and serves as a road foundation, is a highway foundation, is a linear structure built by soil or stones, is continuously increased along with the continuous development of social economy in China, is the foundation of a road surface structure, directly influences the quality of the whole highway, and can be used as a common roadbed filler by locally taking mudstone as a raw material when a newly-built road passes through a region with hilly valley basin landforms in a long distance, such as a wide region in the southwest part of China. If the mudstone is directly used as filler to fill the roadbed according to the characteristics of the mudstone, the problems of softening, disintegration and wetting deformation of the mudstone when meeting water are faced, and the long-distance digging and transporting of high-quality filler are selected to fill the roadbed, so that the construction cost is greatly improved, and the environment is greatly damaged.

Therefore, it is necessary to provide a structure for preventing the subgrade from softening, solving the problem that mudstone is softened and disintegrated and deformed due to wetting, and improving the firmness of the subgrade.

SUMMERY OF THE UTILITY MODEL

In order to overcome the mudstone that exists among the background art and meet water softening disintegration, humidifying deformation, adopt the remote high-quality filler of fortune of digging to carry out the road bed and fill, then can make engineering cost improve greatly, make the environment suffer the problem of very big destruction simultaneously, the utility model provides a prevent structure that the road bed is softened has solved the mudstone and has met water softening disintegration, humidifying deformation's problem, has improved the tightness of road bed.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the utility model provides a structure for preventing roadbed softening, which comprises an upper soil interlayer stone 1, an upper emulsified asphalt layer 2, a core-wrapped mud rock layer 3, a lower emulsified asphalt layer 4, a lower soil interlayer stone 5, a base sheet stone cushion layer 6, an upper anti-seepage geotextile 7 and a lower anti-seepage geotextile 8; core-spun mud stratum 3 above arrange upper emulsified asphalt layer 2, set up upper soil on the upper emulsified asphalt layer 2 and press from both sides stone 1, concrete pavement structure 10 is laid on upper soil presss from both sides stone 1, the downside on core-spun mud stratum 3 is lower floor's emulsified asphalt layer 4, lower floor's emulsified asphalt layer 4 has lower floor's soil to press from both sides stone 5, the tiling has base piece stone bed course 6 below lower floor's soil presss from both sides stone 5.

Core-spun argillite layer 3 include argillite layer 31 and bordure filling material layer 32, bordure filling material layer 32 parcel sets up in argillite layer 31 side, is provided with upper anti-seepage geotechnological cloth 7 between upper soil inclusion stone 1 and the upper emulsified asphalt layer 2, is provided with lower floor's anti-seepage geotechnological cloth 8 between core-spun argillite layer 3 and the lower emulsified asphalt layer 4.

Preferably, the mudstone layer 21 and the bound filling material layer 32 are overlapped by a step method.

Preferably, a geogrid 9 is arranged between the overlapping surfaces of the mudstone layer 31 and the edge-covered filling material layer 32.

Preferably, the geogrid 9 and the anti-seepage geotextile 11 are respectively arranged between the step faying surfaces of the mudstone layer 31 and the tipping filling material layer 32.

Preferably, the upper soil inclusion stone 1 is a soil inclusion stone with a stone content of more than 40% and the lower soil inclusion stone 5 is a soil inclusion stone with a stone content of more than 40% and a thickness of 0.5 m.

The utility model has the advantages that:

the utility model discloses an anti-seepage geotechnological cloth makes mudstone and air and water isolated, prevents the mudstone morals and manners, and geogrid can effectively reduce by the adverse effect of production such as load, temperature, ground cavity and improve the anti-reflection crack ability of borduring filling material layer and mudstone layer overlap joint, can effectually avoid the contact of core-spun mudstone layer and air and rainwater, prevents the morals and manners of mudstone, has solved the mudstone and has met the problem that water softening disintegration, humidifying warp, has improved the tightness of road bed.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a schematic structural view of the geogrid of the present invention.

In the figure, 1-upper soil interlayer stone, 2-upper emulsified asphalt layer, 3-core-spun clay stratum, 4-lower emulsified asphalt layer, 5-lower soil interlayer stone, 6-base sheet stone cushion layer, 7-upper impermeable geotextile, 8-lower impermeable geotextile, 9-geogrid, 10-concrete pavement structure, 11-lap surface impermeable geotextile, 31-clay stratum and 32-edge-covered filling material layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail a preferred embodiment of the present invention with reference to the accompanying drawings to facilitate understanding of the skilled person.

As shown in fig. 1-2, the structure for preventing the subgrade from softening comprises an upper soil interlayer stone 1, an upper emulsified asphalt layer 2, a core-wrapped argillite layer 3, a lower emulsified asphalt layer 4, a lower soil interlayer stone 5, a base sheet stone cushion layer 6, an upper impermeable geotextile 7 and a lower impermeable geotextile 8; core-spun mud stratum 3 above arrange upper emulsified asphalt layer 2, set up upper soil on the upper emulsified asphalt layer 2 and press from both sides stone 1, concrete pavement structure 10 is laid on upper soil presss from both sides stone 1, the downside of core-spun mud stratum 3 is lower floor's emulsified asphalt layer 4, lower floor's emulsified asphalt layer 4 has lower floor's soil presss from both sides stone 5, the tiling has base piece stone bed course 6 below lower floor's soil presss from both sides stone 5.

Core-spun mud rock stratum 3 include mud rock stratum 31 and bordure the filling material layer 32, bordure the filling material layer 32 parcel and set up in mud rock layer 31 side, be provided with upper anti-seepage geotextile 7 between upper soil inclusion stone 1 and the upper emulsified asphalt layer 2, be provided with lower floor's anti-seepage geotextile 8 between core-spun mud rock stratum 3 and the lower floor's emulsified asphalt layer 4, upper anti-seepage geotextile 7 and lower floor's anti-seepage geotextile 8 are the key link of mud rock core-spun filling, can make mud rock and air and water isolated, prevent the weathering of mud rock.

The mudstone layer 21 and the edge-covered filling material layer 32 are overlapped by adopting a step method, the overall stability of the roadbed can be improved, the geogrid 9 or the geogrid 9 and the anti-seepage geotextile 11 of the overlapping surface are arranged between the overlapping surface of the mudstone layer 31 and the edge-covered filling material layer 32, the geogrid 9 can reduce the end part of a joint or a crack with concentrated stress between the mudstone layer 21 and the edge-covered filling material layer 32, and meanwhile, the tensile and anti-shearing capacity of the structure between the mudstone layer 21 and the edge-covered filling material layer 32 can be changed, so that the adverse effects caused by load, temperature, foundation void and the like and the anti-reflection crack capacity of the overlapping part of the mudstone layer 21 and the edge-covered filling material layer 32 can be effectively reduced.

The upper layer soil stone 1 is made of soil stones with a stone content of more than 40% and the lower layer soil stone 5 is made of soil stones with a stone content of more than 40% and a thickness of 0.5m, so that rainwater and air can be prevented from permeating all the year round, and weathering of mudstones is prevented.

In order to guarantee the construction quality of the mudstone roadbed, the utility model discloses a construction technology strictly carries out "urban road roadbed design standard" (GJJ 94), and the saturated water compressive strength of rubble material is not lower than 15MPa, for solving the large-scale borrowing of roadbed filler, and the mudstone construction super grain size granule is more, meets water softening, wait unfavorable problem, takes the layering backfill to the mudstone filled roadbed rubble layer, and every layer of filling height is not more than 50cm according to the standard requirement, and the rubble grain size is not more than every layer thickness 2/3; in order to prevent external water from entering, an upper-layer impermeable geotextile 7 and a lower-layer impermeable geotextile 8 are laid, the upper-layer impermeable geotextile 7 and the lower-layer impermeable geotextile 8 are lapped in a hot-melt welding mode, the lapping position is not less than 10cm, and in order to ensure the tightness of a welding seam, an ultrasonic detection method is carried out for special inspection after the welding is finished. The core-spun mud rock layer 3 is backfilled to avoid rainy days, sufficient rainproof facility materials are required, the backfilling process is strictly backfilled according to parameters obtained by a construction scheme and an experimental road section, the backfilling thickness of each layer is controlled, compactness detection is carried out after each layer of backfilling is finished, and a mud rock edge wrapping line is required to be released during each layer of backfilling to ensure that the thickness of the left and right edge-wrapped road building materials is 5 m.

The utility model discloses a working process:

during construction, firstly, measuring and setting line, measuring and setting a middle pile and a side pile of a road, and excavating a boundary trench for a ground; and secondly, laying a base sheet stone cushion layer 6, manually placing and filling the stone materials with the size of more than 20cm downwards to be stably and tightly closed when the artificial filling is matched with mechanical paving, filling small stone blocks or stone chips into all gaps, crushing the stone materials with the super grain size to meet the requirements, performing layered compaction on the filled stone embankment by using a 25t vibration road roller, continuously filling joints with the small stone blocks or the stone chips during compaction until the top surface of a compacted layer is stable and does not sink any wheel tracks, the stone blocks are tight and the surface is smooth, inspecting by using a porosity index on site, recording, determining as rolling compaction when the porosity is qualified, and measuring a settlement difference value after the roadbed is qualified.

Thirdly, filling 40 percent of soil-included stones with the thickness of 50cm on the base sheet stone cushion layer 6, using lower soil-included stones 5 as anti-seepage geotextile as a transition protection layer, and making the transverse gradient of the transition protection layer be 3 percent and the compaction degree be more than 93 percent; fourthly, laying a lower emulsified asphalt layer 4 on the transition protective layer, pressing the road into the road from the roadside when rolling by a road roller, and keeping the compacted material as a supporting edge all the time; and fifthly, after the lower emulsified asphalt layer 4 is detected to be qualified, laying the lower anti-seepage geotextile 8 on the lower emulsified asphalt layer 4, symmetrically laying the lower anti-seepage geotextile 8 along the road from two sides to the center of the road, staggering lap joints of the short edges of two adjacent lower anti-seepage geotextiles 8, wherein the lap joints are not less than 50cm, and the lap joints of the lower anti-seepage geotextile 8 are welded by hot melting, and the lap joint length is 10cm.

Sixthly, backfilling the mudstone layer 31, marking two 5m side lines on the lower anti-seepage geotextile 8, filling each layer of filled and constructed two-side edge-wrapped 40% soil-rock material, then filling core-wrapped mudstone, compacting each layer of filled and constructed material by a road roller, then filling a second layer, laying 4m wide geogrids 9 at the lap joint part of the two-side edge-wrapped filling material layer 32 and the mudstone layer 31 when the filling height reaches 1m, and laying 6m wide geogrids 9 or lap joint anti-seepage geotextiles 11 at the lap joint part of the two sides when the filling height reaches 3 m; seventhly, laying an upper emulsified asphalt layer 2 in the same construction mode as the fourth step; and eighthly, laying upper-layer impermeable geotextile 7 in the same construction mode as the fifth step, then laying upper-layer soil laminated stones 1, and laying a concrete pavement structure 10 on the upper-layer soil laminated stones 1.

The utility model discloses an anti-seepage geotechnological cloth makes mudstone and air and water isolated, prevents the mudstone morals and manners, and geogrid can effectively reduce by load, temperature, the adverse effect that ground cavity etc. produced and improve the anti-reflection crack ability of borduring filling material layer 32 and the 31 lap-joint of mudstone layer, can effectually avoid the contact of core-spun mudstone layer 3 with air and rainwater, prevents the morals and manners of mudstone, has solved the mudstone and has met the problem that water softening disintegration, humidifying warp, has improved the tightness of road bed.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims

1. A structure for preventing roadbed softening is characterized in that: the structure for preventing the roadbed from softening comprises an upper-layer soil-sandwiched stone (1), an upper-layer emulsified asphalt layer (2), a core-wrapped mud rock layer (3), a lower-layer emulsified asphalt layer (4), a lower-layer soil-sandwiched stone (5), a base sheet stone cushion layer (6), an upper-layer anti-seepage geotextile (7) and a lower-layer anti-seepage geotextile (8); an upper emulsified asphalt layer (2) is arranged on the core-spun mud rock layer (3), an upper soil interlayer stone (1) is arranged on the upper emulsified asphalt layer (2), a concrete pavement structure (10) is laid on the upper soil interlayer stone (1), a lower emulsified asphalt layer (4) is arranged on the lower side of the core-spun mud rock layer (3), a lower soil interlayer stone (5) is arranged below the lower emulsified asphalt layer (4), and a base flaky stone cushion layer (6) is laid below the lower soil interlayer stone (5);

core-spun mud rock stratum (3) including mud rock stratum (31) and bordure filling material layer (32), bordure filling material layer (32) parcel sets up in mud rock stratum (31) side, is provided with upper anti-seepage geotechnological cloth (7) between upper soil clamp stone (1) and upper emulsified asphalt layer (2), is provided with lower floor's anti-seepage geotechnological cloth (8) between core-spun mud rock stratum (3) and lower floor's emulsified asphalt layer (4).

2. A structure for preventing a roadbed from softening according to claim 1, wherein: the mudstone layer (31) and the edge-covered filling material layer (32) are overlapped by adopting a step method.

3. A structure for preventing a roadbed from softening according to claim 1 or 2, wherein: and a geogrid (9) is arranged between the overlapping surfaces of the mudstone layer (31) and the edge-covered filling material layer (32).

4. A structure for preventing a roadbed from softening according to claim 2, wherein: the step faying surface of mudstone layer (31) and bordure filling material layer (32) between be provided with geogrid (9) and faying surface prevention of seepage geotechnological cloth (11) respectively.

5. A structure for preventing a roadbed from softening according to claim 1, 2 or 4, wherein: the upper layer soil stone (1) is the soil stone with the stone content of more than 40% and the lower layer soil stone (5) is the soil stone with the stone content of more than 40% and the thickness of 0.5 m.

6. A structure for preventing a roadbed from softening according to claim 3, wherein: the upper layer soil stone (1) is the soil stone with the stone content of more than 40% and the lower layer soil stone (5) is the soil stone with the stone content of more than 40% and the thickness of 0.5 m.