CN111560799A - Roadbed heat insulation structure in frozen soil area, construction method and application - Google Patents
Roadbed heat insulation structure in frozen soil area, construction method and application Download PDFInfo
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- CN111560799A CN111560799A CN201911125856.0A CN201911125856A CN111560799A CN 111560799 A CN111560799 A CN 111560799A CN 201911125856 A CN201911125856 A CN 201911125856A CN 111560799 A CN111560799 A CN 111560799A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Agronomy & Crop Science (AREA)
- General Engineering & Computer Science (AREA)
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- Road Paving Structures (AREA)
- Railway Tracks (AREA)
Abstract
The invention discloses a frozen soil area roadbed heat insulation structure, a construction method and application, wherein a sand cushion layer is laid above a roadbed, a polyurethane heat insulation layer is sprayed on the upper part of the sand cushion layer or a polyurethane macadam mixed material layer is laid, geotextile is laid on the upper part of the polyurethane heat insulation layer or the polyurethane macadam mixed material layer, a sand/macadam cushion layer is laid on the upper part of the geotextile, and ballast is arranged on the upper part of the sand/macadam cushion layer; spraying polyurethane heat-insulating layers or paving a polyurethane-broken stone mixed material layer on the side slopes on the two sides of the roadbed, paving geotextile above the polyurethane heat-insulating layers or the polyurethane-broken stone mixed material layer, and paving a sand/broken stone cushion layer above the geotextile; the method is used for treating the frost heaving and thaw collapse diseases of the railway subgrade in the seasonal frozen soil area. The roadbed thermal insulation structure and the construction method have good thermal insulation function, can reduce the influence of external atmospheric temperature change on a frozen layer inside the roadbed, and are favorable for relieving the frost heaving and thawing sinking problems of the roadbed, so that the smoothness of a track line can be effectively maintained.
Description
Technical Field
The invention belongs to the technical field of roadbed restoration, and relates to a roadbed thermal insulation structure in a frozen soil area, a construction method and application, in particular to a roadbed thermal insulation structure for treating frozen swelling and thaw collapse diseases of a railway roadbed in a seasonal frozen soil area, a construction method and application.
Background
Seasonal frozen soil is mainly distributed in three provinces in northeast China, inner Mongolia, Tibet, Xinjiang and other areas, and railway subgrades constructed in the areas are faced with the key technical problem of frost heaving and thawing sinking. The frost heaving and thawing settlement of the railway roadbed in the seasonally frozen soil area is mainly reflected in that the temperature of the surface layer of the roadbed is gradually reduced along with the reduction of the atmospheric temperature in autumn and winter, and when the temperature of the surface layer of the roadbed is lower than 0 ℃, water in soil is frozen into ice. Along with the further reduction of outside atmospheric temperature, the freezing frontal surface further moves from top to bottom, and a seasonal frozen layer is formed inside the roadbed, so that the volume of the roadbed soil body is increased to generate frost heaving. The frost heaving can enable the ballast track structure of the railway to bulge upwards, and the smoothness of the track line is deteriorated. Along with the gradual rising of atmospheric temperature in spring and summer, road bed surface temperature risees along with it, makes the freezing layer that forms in autumn and winter inside the road bed melt, leads to the railway roadbed subsides, can deteriorate track line's ride comfort equally, and the soil body is rich in moisture after the road bed freezing layer melts in addition, causes its intensity to show and reduces.
The frost heaving and thawing settlement of the railway ballast track subgrade in the seasonally frozen soil area mainly occurs in the subgrade bed area, and the fundamental reasons are that the temperature inside the subgrade bed is reduced to lower than 0 ℃ due to the reduction of the outside air temperature and the water content of the subgrade bed filler. Because the external atmospheric temperature of the roadbed is difficult to regulate and control, and the roadbed filling is composed of a solid phase body, a gas phase body and a liquid phase body, the moisture in the roadbed is difficult to eliminate; therefore, the design for preventing the railway subgrade from freezing, swelling and thawing mainly comprises three main ways of regulating the internal temperature of the subgrade bed, reducing the water content of the subgrade bed filler and filling the subgrade bed with the filler with low frost heaviness. The corresponding main engineering measures include the measures of limiting the height of an embankment, arranging water-proof and drainage facilities, improving roadbed fillers, laying an insulating layer and the like, and the measures are widely applied to the railway roadbed construction in seasonally frozen soil areas.
According to the investigation on the roadbed sections of the operated Tibet railway, Lanxin high-speed railway, Hadamard high-speed railway, Jingshen high-speed railway and other lines, the seasonal frost heaving and thaw settlement problem of the roadbed is greatly controlled after the roadbed is treated by the anti-freezing swelling and thaw settlement measures; however, the heat preservation efficiency of the measures is not high, the problem of frost heaving and thaw settlement of the roadbed in the seasonally frozen soil area is not solved radically, and the frost heaving and thaw settlement phenomenon still commonly exists; and the measures greatly increase the maintenance workload of the railway ballast track subgrade section.
Disclosure of Invention
Aiming at the defects in the problems, the invention provides a roadbed thermal insulation structure in a frozen soil area, a construction method and application.
A first object of the present invention is to provide a roadbed thermal insulation structure in a frozen soil area, including: the concrete comprises railway ballast, a sand/gravel cushion layer, geotextile, a polyurethane heat-insulating layer or a polyurethane gravel mixed material layer, a sand cushion layer and a roadbed;
the sand cushion layer is laid above the roadbed, the polyurethane heat-insulating layer is sprayed or the polyurethane gravel mixed material layer is laid above the sand cushion layer, the geotextile is laid above the polyurethane heat-insulating layer or the polyurethane gravel mixed material layer, the sand/gravel cushion layer is laid above the geotextile, and ballast is arranged above the sand/gravel cushion layer;
the side slopes on the two sides of the roadbed are sprayed with the polyurethane heat-insulating layer or paved with the polyurethane gravel mixed material layer, the geotextile is paved above the polyurethane heat-insulating layer or the polyurethane gravel mixed material layer, and the sand/gravel cushion layer is paved above the geotextile.
As a further improvement of the invention, the thickness of the sand cushion layer is 5-10 cm.
As a further improvement of the invention, the thickness of the polyurethane heat-insulating layer is not less than 5cm, and the thickness of the polyurethane macadam mixed material layer is not less than 10 cm.
As a further improvement of the invention, the curing time of the polyurethane heat-insulating layer is 10-20 min, and the curing time of the polyurethane macadam mixed material layer is 30-60 min.
As a further improvement of the invention, the polyurethane macadam mixture layer comprises a polyurethane hard foam material and sand and macadam continuous graded aggregate;
the polyurethane rigid foam material accounts for 10-50% of the total mass, and the maximum grain size of the sand and broken stone continuous graded aggregate is not more than 32.5 mm.
As a further improvement of the invention, the sand/gravel cushion has a thickness of 5-10 cm.
A second object of the present invention is to provide a method for constructing the roadbed thermal insulation structure in the frozen soil region, including:
breaking the bottom and cleaning the screen: screening ballast from the part below the surface layer of the ballast bed to the surface layer of the roadbed;
paving a sand cushion layer above the surface layer of the roadbed;
spraying a polyurethane heat-insulating layer or paving a polyurethane macadam mixed material layer above the sand cushion layer and on the side slopes on the two sides of the roadbed;
after the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer is initially set, laying geotextile on the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer;
laying a sand/gravel cushion layer on the geotextile;
and backfilling and tamping the ballast to a target elevation right above the sand/gravel cushion layer.
The third purpose of the invention is to provide an application of the construction method, and the construction method is used for treating frost heaving and thaw collapse damage of the railway subgrade in the seasonal frozen soil area.
Compared with the prior art, the invention has the beneficial effects that:
the roadbed thermal insulation structure and the construction method have good thermal insulation function, can reduce the influence of external atmospheric temperature change on a frozen layer inside the roadbed, and are favorable for relieving the frost heaving and thawing sinking problems of the roadbed, so that the smoothness of a track line can be effectively maintained.
Drawings
Fig. 1 is a schematic structural view of a roadbed thermal insulation structure in a frozen soil area according to an embodiment of the invention.
In the figure:
1. ballast; 2. a sand/gravel cushion; 3. geotextile; 4. a polyurethane heat-insulating layer/polyurethane broken stone mixed material layer; 5. a sand cushion layer; 6. and (7) roadbed.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the attached drawing figures:
aiming at the defects of the prior art, the invention aims to: 1. the heat preservation efficiency of the heat preservation layer is improved; 2. the adherence between the heat-insulating layer and the surface layer of the roadbed is improved; 3. the overall stress state of the ballast bed is improved.
In order to achieve the purpose, the invention provides a roadbed thermal insulation structure in a frozen soil area, a construction method and application, wherein the roadbed thermal insulation structure comprises the following components in parts by weight:
as shown in fig. 1, the present invention provides a roadbed thermal insulation structure in a frozen soil area, including: the concrete comprises railway ballast 1, a sand/gravel cushion layer 2, geotextile 3, a polyurethane heat-insulating layer or polyurethane gravel mixed material layer 4, a sand cushion layer 5 and a roadbed 6; wherein the content of the first and second substances,
the structure right above the roadbed 6 of the invention is as follows: a sand cushion layer 5 is laid above a roadbed 6, a polyurethane heat-insulating layer is sprayed on the upper side of the sand cushion layer 5 or a polyurethane gravel mixed material layer 4 is paved, geotextile 3 is paved above the polyurethane heat-insulating layer or the polyurethane gravel mixed material layer 4, a sand/gravel cushion layer 2 is paved above the geotextile 3, and ballast 1 is arranged above the sand/gravel cushion layer 2.
The structure of the side slopes on two sides of the roadbed 6 is as follows: and (3) spraying a polyurethane heat-insulating layer or paving a polyurethane-broken stone mixed material layer 4 on the side slopes on the two sides of the roadbed 6, paving geotextile 3 above the polyurethane heat-insulating layer or the polyurethane-broken stone mixed material layer 4, and paving a sand/broken stone cushion layer 2 above the geotextile 3.
The design requirements of the above-mentioned each layer structure of the invention are as follows:
the thickness of the sand cushion layer 5 is 5-10 cm.
The thickness of the polyurethane heat-insulating layer 4 is not less than 5cm, and the thickness of the polyurethane macadam mixed material layer 4 is not less than 10 cm.
The curing time of the polyurethane heat-insulating layer 4 is 10-20 min, and the curing time of the polyurethane macadam mixed material layer 4 is 30-60 min; wherein the polyurethane macadam mixed material layer 4 comprises a polyurethane hard foam material and sand and macadam continuous graded aggregate; the polyurethane rigid foam material accounts for 10-50% of the total mass, and the maximum grain size of the sand and broken stone continuous graded aggregate is not more than 32.5 mm; the 2-hour compressive strength of the polyurethane broken stone mixed material layer 4 is more than 1.0 MPa; meanwhile, the anti-aging agent can be added into the polyurethane, so that the anti-aging performance of the polyurethane is excellent; the closed cell content of the polyurethane is more than 90 percent.
The thickness of the sand/gravel cushion layer is 5-10 cm.
The invention provides a construction method of a roadbed heat insulation structure in a frozen soil area, which comprises the following steps:
the treatment method under the ballast bed comprises the following steps:
confirming the beginning of sealing and well protecting construction;
breaking the bottom and cleaning the screen: screening ballast from the part below the surface layer of the ballast bed to the surface layer of the roadbed;
paving a sand cushion 5 of 5-10cm above the surface layer of the roadbed 6;
spraying a polyurethane heat-insulating layer 4 which is not less than 5cm thick and can be quickly cured on the sand cushion layer 5 or paving a polyurethane macadam mixed material layer 4 which is not less than 10cm thick and can be quickly cured;
after the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer 4 is initially set, the geotextile 3 is laid on the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer 4;
laying a 5-10cm sand/gravel cushion layer 2 on the geotextile 3;
backfilling and tamping the ballast 1 to a target elevation right above the sand/gravel cushion layer 2;
restoring the line;
the next skylight point repeats the above work until remediation is complete.
The treatment method of the roadbed slopes at two sides comprises the following steps:
clearing and leveling the roadbed side slope;
spraying a polyurethane heat-insulating layer 4 which is not less than 5cm thick and can be quickly cured or paving a polyurethane broken stone mixed material layer 4 which is not less than 10cm thick and can be quickly cured on side slopes on two sides of the roadbed 6;
after the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer 4 is initially set, the geotextile 3 is laid on the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer 4;
and paving a 5-10cm sand/gravel cushion layer 2 on the geotextile 3.
The invention provides an application of the construction method, and the construction method is used for treating the frost heaving and thaw collapse diseases of the railway subgrade in the seasonal frozen soil area.
The invention has the advantages that:
the invention sprays a polyurethane heat-insulating layer which is not less than 5cm and can be quickly cured or paves a polyurethane macadam mixed material layer which can be quickly cured on the sand cushion layer, wherein the polyurethane heat-insulating layer is cured for about 15min, the polyurethane macadam mixed material layer is cured for about 40min, and the next operation can be carried out after the curing; meanwhile, the heat-insulating layer sprayed on site can well adapt to the shape of the existing foundation bed, and is more favorable for playing the heat-insulating effect.
The roadbed thermal insulation structure and the construction method have good thermal insulation function, can reduce the influence of external atmospheric temperature change on a frozen layer inside the roadbed, and are favorable for relieving the frost heaving and thawing sinking problems of the roadbed, so that the smoothness of a track line can be effectively maintained.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a frozen soil district road bed insulation construction which characterized in that includes: the concrete comprises railway ballast, a sand/gravel cushion layer, geotextile, a polyurethane heat-insulating layer or a polyurethane gravel mixed material layer, a sand cushion layer and a roadbed;
the sand cushion layer is laid above the roadbed, the polyurethane heat-insulating layer is sprayed or the polyurethane gravel mixed material layer is laid above the sand cushion layer, the geotextile is laid above the polyurethane heat-insulating layer or the polyurethane gravel mixed material layer, the sand/gravel cushion layer is laid above the geotextile, and ballast is arranged above the sand/gravel cushion layer;
the side slopes on the two sides of the roadbed are sprayed with the polyurethane heat-insulating layer or paved with the polyurethane gravel mixed material layer, the geotextile is paved above the polyurethane heat-insulating layer or the polyurethane gravel mixed material layer, and the sand/gravel cushion layer is paved above the geotextile.
2. The subgrade thermal insulation structure in the frozen soil area of claim 1, wherein the thickness of the sand cushion layer is 5-10 cm.
3. The roadbed thermal insulation structure in the frozen soil area, according to claim 1, wherein the thickness of the polyurethane thermal insulation layer is not less than 5cm, and the thickness of the polyurethane-crushed stone mixture layer is not less than 10 cm.
4. The roadbed thermal insulation structure in the frozen soil area as claimed in claim 1, wherein the curing time of the polyurethane thermal insulation layer is 10-20 min, and the curing time of the polyurethane macadam mixture layer is 30-60 min.
5. The roadbed thermal insulation structure in the frozen soil area, according to claim 4, wherein the polyurethane broken stone mixed material layer comprises polyurethane hard foam material and sand and broken stone continuous grading aggregate;
the polyurethane rigid foam material accounts for 10-50% of the total mass, and the maximum grain size of the sand and broken stone continuous graded aggregate is not more than 32.5 mm.
6. The subgrade thermal insulation structure in the frozen soil area according to claim 1, wherein the thickness of the sand/gravel cushion is 5-10 cm.
7. A construction method of the roadbed thermal insulation structure in the frozen soil area according to any one of claims 1 to 6, which comprises:
breaking the bottom and cleaning the screen: screening ballast from the part below the surface layer of the ballast bed to the surface layer of the roadbed;
paving a sand cushion layer above the surface layer of the roadbed;
spraying a polyurethane heat-insulating layer or paving a polyurethane macadam mixed material layer above the sand cushion layer and on the side slopes on the two sides of the roadbed;
after the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer is initially set, laying geotextile on the polyurethane heat-insulating layer or the polyurethane broken stone mixed material layer;
laying a sand/gravel cushion layer on the geotextile;
and backfilling and tamping the ballast to a target elevation right above the sand/gravel cushion layer.
8. The use of the method according to claim 7 for treating frost heaving and thaw collapse of railroad beds in seasonal frozen soil areas.
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| CN201911125856.0A CN111560799B (en) | 2019-11-18 | 2019-11-18 | Roadbed heat insulation structure in frozen soil area, construction method and application |
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| CN201911125856.0A CN111560799B (en) | 2019-11-18 | 2019-11-18 | Roadbed heat insulation structure in frozen soil area, construction method and application |
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| CN111560799B CN111560799B (en) | 2022-07-01 |
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