METHOD OF TUNNEL PIERCING UNDER RAILWAY EMBANKMENT Russian patent published in 2008 - IPC E02D29/45 

FIELD: road construction industry.

SUBSTANCE: invention refers to underground excavations and can be used for big-section transport tunneling under railway embankments as well as for conduit pipes' construction under railway embankments. Method of tunnel piercing under railway embankment includes boring of a number of wells along the outline of tunnel being constructed with subsequent concreting and soil removal from outline resulted from boring process. Wells are bored step by step in horizontal plane, with portal frames with conductor guides preinstalled on two sides of embankment slopes along their external outline. Leading small well is bored by means of determining boring direction by hole provided in conductor. After the leading well is bored, end of small boring tool is hinged to end of big boring tool arranged in casing pipe. Big boring tool moves in leading well behind small boring tool together with casing pipe, which is installed in well after boring is completed, and boring tools are removed. After required number of casing pipes is installed along outline of portal frames, soil is removed from their cavity and they are filled with concrete mix. Soil is removed from outline formed by continuous rows of casing pipes along the whole section and throughout the length of tunnel.

EFFECT: reduction of risk of integrity damage, protection of railway embankment from deformations and breakage without road traffic stop when piercing a tunnel.

2 dwg