Overwintering protection structure for foundation pit bottom in seasonal frozen soil area and construction method
A technology of protective structure and construction method, applied in basic structure engineering, soil protection, excavation, etc., can solve the problem of difficult frost heave risk, reduce frost heave risk, improve air temperature, and ensure the effect of winter protection effect
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Embodiment 1
[0037] The overwintering protection structure at the bottom of the foundation pit in the seasonally frozen soil area includes a protective layer 1 , a heating drainage tank 2 , an overhead overwintering protection bag 3 and a thermal insulation and antifreeze layer 4 .
[0038] The protective layer 1 is a covering layer with functions of heat preservation, waterproofing and fire prevention, and is laid on the bottom 6 of the foundation pit in the seasonal frozen soil area as the main body of overwintering protection. The protective layer 1 is waterproof cloth and fireproof cloth from bottom to top; the fireproof cloth and waterproof cloth are selected to have the same width and are laid along one direction. Less than 300mm; the joints of fireproof cloth and waterproof cloth are sealed and connected to prevent rain or snow from infiltrating; the joints of fireproof cloth are covered with square logs or soil bags. The protective layer 1 is provided with waterproof vent holes, wh...
Embodiment 2
[0044] The construction method of the overwintering protection structure at the bottom of the foundation pit in the seasonally frozen soil area comprises the following steps:
[0045] 1) For foundation pits that cannot be continued due to winter in seasonally frozen soil areas, the bottom of the foundation pit should be covered with thermal insulation and antifreeze construction. After the soil layer is reserved above the design level of the bottom of the foundation pit, clean up the construction waste and accumulated water at the bottom 6 of the foundation pit to ensure that it is clean, free of foreign matter, and free of accumulated water.
[0046] 2) In the bottom of the foundation pit where water is easy to accumulate 5 (such as sump pits, independent foundation overexcavation areas, etc.), the thermal insulation and antifreeze layer 4, the uninflated overhead winter protection bag 3 are laid in sequence; the air intake valve 3-2 is connected with the heating The air pump...
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