BRIDGE-TYPE PASSING ON PERMAFROST Russian patent published in 1995 - IPC

FIELD: civil engineering. SUBSTANCE: bridge-type passing on permafrost has access bank with side and river slopes positioned on the ground of base 3. Access part of the bank has lower tier 1 and upper one 2. In plane the lower tier has curvilinear convex shape. The upper tier has base area 4 and laid banks 5. The bridge has span abutments comprising abutment body 7 and abutment foundation. The abutment foundation is made in the form of union surface structure stacked on the lower tier and having carrier plate type member 8 and thermal insulating member 9. Surface structure is led in river banks 10 and broadened in the direction of river bed on the value of l equal to structure height. Cross dimension of the lower tier in the cross section beginning from lengthwise axis of the bridge through back face of the abutment is b₁≥ 2mh. The lower tier is taken out from the front face of the abutment as to lengthwise direction to river bed on the value of b₂≥ mh, with side and river banks of the upper tier having slope equal to (1:4) to (1: 7). A cut of deep equal to height of the upper tier and b₃ width equal to that of span structure is made in the upper tier directly over the span structure. EFFECT: decreased cost of the foundation, decreased man-hours, decreased time limits to construct the structure. 8 dwg