FIELD: mining industry, civil engineering. SUBSTANCE: proposed gear can be used for laying of service lines under obstacles by trench- free method. Gear has frame, carriage and at least one feeding hydraulic cylinder. Frame comes in the form of base and mobile section with guides. Mobile section is put on base for longitudinal movement. Carriage is placed on mobile section for longitudinal movement over its guides. Base and mobile section are kinematically intercoupled by feeding hydraulic cylinder. Carriage is mounted for fixing on mobile section when it comes to its extreme positions and for fixing on base when base and mobile section are moved apart. EFFECT: simplified design, raised operational efficiency. 2 cl, 7 dwg
