METHOD OF CONSTRUCTING TUNNEL UNDER TRAFFIC ARTERIES FOR ORGANISING TRAFFIC INTERSECTIONS AT CROSS-ROADS Russian patent published in 2009 - IPC E02D29/45 

FIELD: road construction industry.

SUBSTANCE: invention refers to underground construction and can be used for building large tunnels under traffic arteries for organising traffic intersections at cross-roads, as well as at railway crossings. Method of constructing tunnel for organising traffic intersections at cross-roads, which are formed with traffic arteries located at one and the same level, involves horizontal drilling performed in series and in steps by pre-installing a portal frame with conductor guides along external outline of tunnel for drilling leading wells of small diametre. The method is implemented so that after drilling of leading wells is completed, the end of the boring tool of small diametre is connected to the end of boring tool of large diametre, which is placed in casing pipe. Boring tool of large diametre is moved in the leading well after the boring tool of small diametre together with casing pipe, which is left in the well after drilling is completed, and boring tools are removed. After the required number of casing pipes is fixed along the outline of portal frames, soil is removed from cavity and it is filled with concrete mixture. In secondary traffic artery, by using slurry wall method, there reinforced are installation places of portal frames and ramps are made, which provide the access to organisation of works on construction of tunnel under the main traffic artery. Then upper tunnel covering is installed, after that, side tunnel walls are made by means of the above described method, then wall in the soil which covers tunnel portal is demolished, and soil is removed from the whole internal space of tunnel.

EFFECT: reducing the time required for traffic interruption during construction and labour input during work execution when constructing tunnel.

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