A roadbed thermal insulation construction method in permafrost regions
A construction method and frozen soil technology, applied in roads, roads, buildings, etc., can solve problems such as subgrade and pavement cracking, subgrade lifting, etc., to avoid frost heaving and thawing settlement, increase net heat release, and inhibit crack development Effect
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Embodiment 1
[0026] The subgrade thermal insulation construction method in permafrost regions of the present invention comprises the following steps:
[0027] (1) Excavate the permafrost below the ground line in the permafrost layer, and lay polypropylene base cloth as the insulation berm;
[0028] (2) Lay the capillary water isolation layer with low liquid limit clay, and roll it 2~3 times with rolling equipment;
[0029] (3) Pave the block stone layer in a one-time pouring method to ensure sufficient pores;
[0030] (4) Lay small stones on the block stone layer to prevent the following reverse filter layer from leaking into the block stone layer and thus affect the ventilation effect. The paving thickness of the block stone layer is 125cm, and the rolling equipment is used to roll 6~8 times;
[0031] (5) Lay the gravel filter layer and the thick medium-coarse sand filter layer; the thickness of the gravel filter layer is 23cm, and it is rolled 7 to 9 times with rolling equipment, and th...
Embodiment 2
[0036] The subgrade thermal insulation construction method in permafrost regions of the present invention comprises the following steps:
[0037] (1) Excavate the permafrost below the ground line in the permafrost layer, and lay polypropylene base cloth as the insulation berm;
[0038] (2) Lay the capillary water isolation layer with low liquid limit clay, and roll it 2~3 times with rolling equipment;
[0039] (3) Pave the block stone layer in a one-time pouring method to ensure sufficient pores;
[0040] (4) Lay small stones on the block stone layer to prevent the following reverse filter layer from leaking into the block stone layer and thus affect the ventilation effect. The paving thickness of the block stone layer is 125cm, and the rolling equipment is used to roll 6~8 times;
[0041] (5) Lay the gravel filter layer and the thick medium-coarse sand filter layer; the thickness of the gravel filter layer is 23cm, and it is rolled 7 to 9 times with rolling equipment, and th...
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