GROUND INTAKE DEVICE Russian patent published in 2003 - IPC

FIELD: construction engineering; pipe laying. SUBSTANCE: invention can be used at trenchless laying of pipelines. Proposed device contains core catcher and impact mechanism connected with core catcher by means of fastening unit. Core catcher is provided with support surface for fastening unit whose generatrix is parallel to axis of core catcher being limited at one side by thrust surface square to axis of core catcher. Fastening unit has vertical symmetry plane coinciding with vertical symmetry plane of core catcher, and also support and thrust surfaces. Generatrix of support surface and thrust surface of fastening unit are parallel, respectively, to generatrix of support surface and thrust surface of core catcher. Fastening unit is provided with through cutout on side walls of which conical distance surfaces are made for connection with conical front part of impact mechanism. Conical distance surfaces are parts of conical surface of rotation whose axis is in vertical symmetry plane of fastening unit being parallel to axis of core catcher and displaced to lower edge of through cutout. Fastening unit is installed in core catcher for limited transverse and axial displacement. EFFECT: improved reliability, adaptability to manufacture and longevity of device. 4 cl, 7 dwg