DOUBLE-LEVEL MOTOR TRANSPORT OVERBRIDGE OF TUNNEL TYPE Russian patent published in 2009 - IPC E02D29/00 

FIELD: transportation.

SUBSTANCE: double-tier motor transport overbridge of tunnel type includes tunnel of circular cross section with internal diametre of more than 19 m, concrete shell of which is made of prefabricated reinforced concrete blocks and is separated into two levels with height dimension of each one of at least 4.5 m by parallel reinforced concrete plates, which are installed along the whole length of tunnel with organisation of four one-way traffic lanes for motor transport in every level in opposite directions with road bed width of at least 14.5 m of each one of them, at that in tunnel arc part central ventilation box is installed with valves for servicing of upper level of tunnel, and in lower level there are side ventilation boxes installed, and in order to provide for possibility to service tunnel and provide for efficiency of its ventilation, it is equipped with service tunnel arranged parallel to it at the level of upper level and its ventilation box, which is separated with partition and forms its ventilation box, upper part of which is connected via linkages with central ventilation box. Besides section of ventilation box separated by partition of service tunnel upper part exceeds section of central ventilation box, at that the latter is connected by channels to side ventilation boxes of lower level. At that double-level motor transport overbridge of tunnel type is equipped with technological headers that are arranged in cavity separated into zones under lower level, at that from every level and technological header outlets are provided, which are connected by means of stair flights with space separated with longitudinal partition under partition of service tunnel. And for isolation of transport flows directed to tunnel or from tunnel, roadways are arranged of one-way traffic with transition into different levels each under inclination of 4% in transition zone and their equal displacement to longitudinal axis of tunnel as it approaches it.

EFFECT: lower labour intensiveness of tunnel structure with provision of its optimal throughput capacity and safety of traffic with observation of optimal conditions.

4 cl, 6 dwg