SOIL-BACKFILLED BRIDGE Russian patent published in 2017 - IPC E01D4/00 E01D21/00 

FIELD: construction.

SUBSTANCE: bridge structure is made prefabricated of fibrous concrete elements equipped with embedded parts and a structure of plates and a geogrid, that allows to distribute vertical pressure from the rolling stock to the unpressurized arch zone. Supports are made prefabricated, mounted on a grillage combining the piles, and a parabolic-shaped arch made of fibrous concrete and consisting of separate blocks hingedly connected to one another along the outer arch surface rests on the supports. On the upper surface of each block, there are niches in its corners, in which there are metal embedded lugs, two pieces in a niche on one side of the block, and four - on the opposite side; each lug has an opening for the bolts, the axis of which coincides with the point of intersection of the lateral and the upper surface of the blocks. On the contacting surfaces of each block, projections are made on one side, and recesses on the other side, which are combined during the installation of the arch, the central part of which is the unpressurized zone, i.e. not experiencing lateral bearing reaction of the soil. Sandy cushions are placed on the boundaries of the unpressurized zone, on which transitional reinforced concrete slabs rest, a layer of sand is poured onto the slabs; after its compaction, a polymeric geogrid with a slope from the vertical axis of the arch to the side of the bridge supports is placed within the soil backfilling cage. Road pavement layers are laid over the sand. The bridge facade along the entire height is laid out with gabions interconnected by reinforcement, the last row of which serves as a guard rail, the gabions being installed during the arrangement of the soil cage of the bridge backfilling.

EFFECT: simplifying the installation of bridge structures, reducing eccentric loads on the arch, increasing the strength of load-bearing elements by using fibrous concrete.

7 dwg