METHOD OF TUNNEL TYPE POURED-IN-PLACE STRUCTURE CONCRETING IN ENLARGED BLOCKS WITH STEP-IN-STEP STRUCTURE COMPONENT ERECTION IN TOP-BOTTOM DIRECTION

摘要

FIELD: building, particularly underground or underwater structures. ^ SUBSTANCE: method involves building foundation; heating thereof before pouring concrete mix and performing concreting cast-in-place blocks by pouring concrete mix having different temperature along structure height; vibrating concrete mix; covering structure surfaces not enclosed by form with water-impermeable and heat-insulating material and curing thereof in form up to obtaining necessary concrete strength. Foundation is formed of piles arranged along tunnel wall axes. Foundation is heated up to 5 - 20oC. Concreting of members supported by wall piles is performed by filling form with concrete mix under temperature of 20 - 30oC up to level located at height exceeding height of wall component with 4 m-1 surface modulus by 500 mm. Remaining wall and floor structure parts are filled with reinforced concrete mix under 10 - 20oC temperature. Concrete of outer pile foundation area having 600 - 800 mm height measured from contact line with concrete mix is heated up to obtaining 0.28 - 0.3 R28 concrete strength. Form material and covering material have thermal resistance of 0.2 - 0.3 (m2.deg)/W. Form for forming wall components having 4 m-1 surface modulus are coated starting from bottom by material having thermal resistance of 0.2 - 0.5 (m2.deg)/W to improve warmth-keeping thereof. Height of form to be covered and concreting block height are determined from given formulae. ^ EFFECT: improved crack-resistance; increased erection rate due to increasing admissible dimensions of blocks to be concreted. ^ 3 dwg, 1 ex