FIELD: civil engineering. SUBSTANCE: invention relates to construction of tunnels using jack plant for forcing case of tube sections when building small-diameter tunnels under ground. Proposed jack plant consists of frame with guides, pressure plate installed on guides of frame for displacement in direction of forcing through, support plate, pumping station, control system and hydraulic cylinders with housing and rod coupled with pressure and support plates, and expanding device. Frame of plant is furnished additional with guides on which rods or cylinder housings are installed for displacement to side opposite to direction of forcing through. Said rods or cylinder housings are connected with support plate. Separate control of cylinders is provided. Support plate consists of two parts, right-hand and left-hand ones, each being connected by joint with rod or housing of corresponding cylinder. Expanding device consists of links, jacks and devices for locking jacks of expanding device relative to frame longitudinally. EFFECT: improved reliability of forcing through and operation of jack plant. 3 cl, 5 dwg
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