Patent ID: 6848865

Claim:
A trench shoring device consisting of rails, which are provided on either side thereof with an outer and an inner guide relative to interior of a trench and spaced in pairs alongside the wall of trench, of vertically mobile trusses to uphold rails of each pair of rails, and large shoring panels sliding vertically between adjacent rails within the outer and inner guides creating respectively an outer shoring wall and an inner shoring wall relative to the interior of the trench, and wherein: the rail having a main tube of rectangular shape, a back flange welded on the narrow side of said main tube touching the wall of the trench, two lateral tubes of rectangular shape, smaller in size than said main tube, which are welded parallel on both wider sides of said main tube at a distance relative to said back flange and projecting inward past said main tube, and two front flanges each of them welded on a narrow side of said lateral tube farthest away relative to said back flange; said back flange extending laterally in the lengthwise direction of the trench on either side of said main tube at a distance comparable to the width of said lateral tube so that an outer guide is outlined on either side along entire rail between said back flange, long side of the main tube and proximal narrow side of said lateral tube; said back flange being provided alongside thereof with a strip or round bar welded flush to the lip of inner side relative to said outer guide so that an outer shoring panel interlocks when sliding vertically within the outer guide of the rails; each said front flange being slightly and equally extended into a gap between lateral tubes, past said main tube, enough to shape a frontal guide of C-shape type along entire rail that contours to the guiding edge of a truss or spreader to slide interlocked within the frontal guide of the rails; for at least the bottom half of the rail, said front flange being extended laterally in opposite directions relative to said main tube in the lengthwise direction of the trench from said lateral tube at a distance slightly bigger than the width of said lateral tube, so that an inner guide is outlined between said front flange and the longer side of said lateral tube; each said front flange provided alongside with a strip or round bar welded flush to the lip of inner side of the front flange relative to said inner guide so that an inner shoring panel interlocks when sliding vertically within the inner guide of the rails; said outer shoring panel and said inner shoring panel having laterally guide channels to fit the said outer guide and said inner guide of said rail; the vertically mobile truss or individual spreader having guiding edges to fit the said frontal guide of the rail to slide interlocked within the frontal guide of the rails; said articulated truss or said individual spreader provided with roller to displace vertically along said front flanges of said rail.