CN105350417A - High-cold roadbed frozen soil heat insulation construction method - Google Patents

Abstract

The present invention discloses a high-cold roadbed frozen soil heat insulation construction method comprising the following steps: (1) according to whole-line frozen soil exploration data, a whole-line frozen soil roadbed is divided into three sections, namely, a less-ice and much-ice frozen soil area, a rich-ice and full-ice frozen soil area and a soil-containing ice layer road section, (2) the less-ice and much-ice frozen soil area is constructed, (3) the rich-ice and full-ice frozen soil area is constructed, and (4) the soil-containing ice layer road section is constructed. By control of the key technology, the problem of discharge of water in the slope toe of a roadbed with large ground lateral slope, and a frozen layer on the top of a cutting slope can be well solved, water sources can be effectively led away from the roadbed bottom to ensure the permafrost roadbed and the cutting slope are not eroded by overground water, permafrost region roadbed frost heaving and thaw collapse damage can be effectively prevented, permafrost region roadbed and road construction is normalized and standardized, the mechanistic organization is reasonable, and by sectional parallel operation and in-section assembly line operation, work efficiency is improved, construction quality is ensured, and the benefits are more prominent.

Description

A kind of high and cold roadbed frozen soil thermal-insulation construction method

Technical field

The present invention relates to a kind of high and cold roadbed frozen soil thermal-insulation construction method.

Background technology

Along with the fast development of highway in China building cause, high latitude in recent years, extremely frigid zones starts to build highway successively, because highway alignment permafrost distribution is wider, complicated hydrogeological conditions, when highway is implemented, generally only implement roadbed, bridges and culverts, the engineering such as draining and protection, road pavement is not implemented temporarily, all the other sections equal makings asphalt concrete pavement, through runing for many years, above section major part roadbed situation is better, but due to the non-making in road surface, roadbed end face is uneven, and there is the diseases such as frost boiling in various degree in local roadbed, govern the resource transport traffic capacity, the present invention is in conjunction with the disease conditions of existing highway and hydrogeological characteristics, Disease Treatment process is carried out to above section, unimpeded to ensure the transport of highway completely, improve highway capacity along the line.

Summary of the invention

The present invention is exactly for the problems referred to above, provides a kind of high and cold roadbed frozen soil thermal-insulation construction method, can ensure subgrade in permafrost soil zone and cutting not by the erosion of ground water, effectively can prevent and treat the generation of permafrost area embankment frost heave, thaw collapse disease.

For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme, and the heat insulation construction of a kind of high and cold roadbed frozen soil, is characterized in that, comprise the following steps:

(1) according to all fronts frozen soil prospecting data, be divided into three section by frozen earth roadbed completely, be respectively few ice, many ice permafrost region, Fu Bing, full ice permafrost region and contain native ice sheet section;

(2) few ice, many ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, section is high-end is all greater than 2.0m for major part, and according to field investigation, roadbed filling fills with boulder and cobble soil, gravelly soil substantially, and roadbed situation is better, therefore this no longer carries out specially treated, by general subgrade process, only strengthen draining, preventive works, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(3) rich ice, full ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, major part section is high-end is all greater than rational height of roadbed as calculated and critical height of subgrade, therefore for ensureing subgrade stability, take roadbed both sides that insulation banket is set, banket width and height, when roadbed height is greater than 3.0m, banket width 3.0m, height 1.5m; When roadbed height is less than 3.0m, banket width 3.0m, height 1.2m, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(4) construct to containing native ice sheet section:

A () is less than the embankment of 1.8m for roadbed raising, partly fill out and partly dig and cut subgrade, consider in Permafrost Area, grit Pavement Improvement is after flexible pavement, ever-frozen ground will occur significantly to degenerate, frozen earth roadbed heat stability constantly worsens, therefore for ensureing roadbed temperature, this design 50cm place below bed course arranges thick layer 6cmXSP warming plate isolation layer, with the subgrade defect that protection of permafrost steady change causes, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affect subgrade stability, simultaneously according to roadbed height, topographic features is provided with wide 3.0m, high 1.2 ~ 1.5m is incubated banket,

B () is for the filled-up ground of roadbed raising 1.8 < H≤2.5m, for ensureing subgrade stability, this adopts the existing old road of cutouts and arranges sheet, block stone ventilated embankment, sheet, block stone ventilation thickness 0.8m, on it thick macadam of making 20cm levelling after carry out heavy type and roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm;

C () is for roadbed raising H > 2.5m, this considers that roadbed height is higher, and old road based filler is better, and existing old road base resistance to overturning is better, therefore take to arrange insulation banket in roadbed both sides, the wide 3.0m of banket, high 1.2 ~ 1.5m;

D () is for section of bursting and become muddy when a thaw sets in along the line, take according to roadbed raising and topographic features: 1.8m section is greater than for roadbed raising, after taking to excavate old road frost boiling part to stabilized zone position, rubble ventilation embankment is set, sheet, block stone ventilation thickness 0.8m, it carries out heavy type after thick macadam leveling layer of making 20cm roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm; Roadbed raising is less than to embankment and the excavation section of 1.8m, after taking to excavate old road part, roadbed scope (80cm) is changed and fills out grit process, and thick layer 6cmXSP warming plate isolation layer is set at 50cm place, bottom surface, road surface.

The invention has the beneficial effects as follows: this high and cold roadbed frozen soil thermal-insulation construction method, by the control of key technology, solve the roadbed toe that lateral slope of ground is larger preferably, the rafting problem of cutting top suprapermafrost water, effectively water source is deflected from the bottom of roadbed, ensure subgrade in permafrost soil zone and cutting not by the erosion of ground water, can effectively prevent and treat permafrost area embankment frost heave, the generation of thaw collapse disease, permafrost area embankment, pavement construction standardizes, standardization, mechanization tissue is reasonable, by piecewise-parallel operation, continuous productive process in section, increase work efficiency, ensure construction quality, its benefit is more outstanding.

Detailed description of the invention

A kind of method utilizing earthworm to raise chickens of the present invention:

(1) according to all fronts frozen soil prospecting data, be divided into three section by frozen earth roadbed completely, be respectively few ice, many ice permafrost region, Fu Bing, full ice permafrost region and contain native ice sheet section;

(2) few ice, many ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, section is high-end is all greater than 2.0m for major part, and according to field investigation, roadbed filling fills with boulder and cobble soil, gravelly soil substantially, and roadbed situation is better, therefore this no longer carries out specially treated, by general subgrade process, only strengthen draining, preventive works, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(3) rich ice, full ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, major part section is high-end is all greater than rational height of roadbed as calculated and critical height of subgrade, therefore for ensureing subgrade stability, take roadbed both sides that insulation banket is set, banket width and height, when roadbed height is greater than 3.0m, banket width 3.0m, height 1.5m; When roadbed height is less than 3.0m, banket width 3.0m, height 1.2m, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(4) construct to containing native ice sheet section:

A () is less than the embankment of 1.8m for roadbed raising, partly fill out and partly dig and cut subgrade, consider in Permafrost Area, grit Pavement Improvement is after flexible pavement, ever-frozen ground will occur significantly to degenerate, frozen earth roadbed heat stability constantly worsens, therefore for ensureing roadbed temperature, this design 50cm place below bed course arranges thick layer 6cmXSP warming plate isolation layer, with the subgrade defect that protection of permafrost steady change causes, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affect subgrade stability, simultaneously according to roadbed height, topographic features is provided with wide 3.0m, high 1.2 ~ 1.5m is incubated banket,

B () is for the filled-up ground of roadbed raising 1.8 < H≤2.5m, for ensureing subgrade stability, this adopts the existing old road of cutouts and arranges sheet, block stone ventilated embankment, sheet, block stone ventilation thickness 0.8m, on it thick macadam of making 20cm levelling after carry out heavy type and roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm;

C () is for roadbed raising H > 2.5m, this considers that roadbed height is higher, and old road based filler is better, and existing old road base resistance to overturning is better, therefore take to arrange insulation banket in roadbed both sides, the wide 3.0m of banket, high 1.2 ~ 1.5m;

D () is for section of bursting and become muddy when a thaw sets in along the line, take according to roadbed raising and topographic features: 1.8m section is greater than for roadbed raising, after taking to excavate old road frost boiling part to stabilized zone position, rubble ventilation embankment is set, sheet, block stone ventilation thickness 0.8m, it carries out heavy type after thick macadam leveling layer of making 20cm roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm; Roadbed raising is less than to embankment and the excavation section of 1.8m, after taking to excavate old road part, roadbed scope (80cm) is changed and fills out grit process, and thick layer 6cmXSP warming plate isolation layer is set at 50cm place, bottom surface, road surface.

To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, therefore all changes be intended in the implication of the equivalency by dropping on claim and scope are included in the present invention, any Reference numeral in claim should be considered as the claim involved by limiting.

The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims (1)

1. a high and cold roadbed frozen soil thermal-insulation construction method, is characterized in that, comprise the following steps:

(1) according to all fronts frozen soil prospecting data, be divided into three section by frozen earth roadbed completely, be respectively few ice, many ice permafrost region, Fu Bing, full ice permafrost region and contain native ice sheet section;

(2) few ice, many ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, section is high-end is all greater than 2.0m for major part, and according to field investigation, roadbed filling fills with boulder and cobble soil, gravelly soil substantially, and roadbed situation is better, therefore this no longer carries out specially treated, by general subgrade process, only strengthen draining, preventive works, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(3) rich ice, full ice permafrost region are constructed: by adding elevated formation level analysis to former Subgrade of old road height and this, major part section is high-end is all greater than rational height of roadbed as calculated and critical height of subgrade, therefore for ensureing subgrade stability, take roadbed both sides that insulation banket is set, banket width and height, when roadbed height is greater than 3.0m, banket width 3.0m, height 1.5m; When roadbed height is less than 3.0m, banket width 3.0m, height 1.2m, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affects subgrade stability;

(4) construct to containing native ice sheet section:

A () is less than the embankment of 1.8m for roadbed raising, partly fill out and partly dig and cut subgrade, consider in Permafrost Area, grit Pavement Improvement is after flexible pavement, ever-frozen ground will occur significantly to degenerate, frozen earth roadbed heat stability constantly worsens, therefore for ensureing roadbed temperature, this design 50cm place below bed course arranges thick layer 6cmXSP warming plate isolation layer, with the subgrade defect that protection of permafrost steady change causes, and strengthen roadbed both sides waterproof and drainage design, to dredge roadbed periphery charge for remittance, anti-sealing infiltrates roadbed, affect subgrade stability, simultaneously according to roadbed height, topographic features is provided with wide 3.0m, high 1.2 ~ 1.5m is incubated banket,

B () is for the filled-up ground of roadbed raising 1.8 < H≤2.5m, for ensureing subgrade stability, this adopts the existing old road of cutouts and arranges sheet, block stone ventilated embankment, sheet, block stone ventilation thickness 0.8m, on it thick macadam of making 20cm levelling after carry out heavy type and roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm;

C () is for roadbed raising H > 2.5m, this considers that roadbed height is higher, and old road based filler is better, and existing old road base resistance to overturning is better, therefore take to arrange insulation banket in roadbed both sides, the wide 3.0m of banket, high 1.2 ~ 1.5m;

D () is for section of bursting and become muddy when a thaw sets in along the line, take according to roadbed raising and topographic features: 1.8m section is greater than for roadbed raising, after taking to excavate old road frost boiling part to stabilized zone position, rubble ventilation embankment is set, sheet, block stone ventilation thickness 0.8m, it carries out heavy type after thick macadam leveling layer of making 20cm roll, then making 20cm grit leveling, loaded filter, the levelling size controlling of rubble is at 5 ~ 10cm; Roadbed raising is less than to embankment and the excavation section of 1.8m, after taking to excavate old road part, roadbed scope (80cm) is changed and fills out grit process, and thick layer 6cmXSP warming plate isolation layer is set at 50cm place, bottom surface, road surface.