| 摘要 |
<p>The specification discloses a double sleeve pipe coupler for coupling coaxially juxtaposed plain end steel pipe sections or pipe pile in metal-to-metal leakproof contact and at the same time providing a high strength connection under tension. Several forms of couplers are disclosed, all essentially having two rigid metallic cylindrical sleeves of different diameter arranged coaxially one within the other with an annular space therebetween at each end into which the wall of the plain end pipe or pipe pile may be driven as by hammering or by a pile driving hammer. The annular space between the sleeves flares radially outwardly toward the center of the coupler or expands in diameter to a larger diameter toward the center of the coupler. Thus, as the pipe or pipe pile is hammered or driven into the coupler, the wall of the pipe or pipe pile is expanded over the inner sleeve to form a metal-to-metal seal therewith. The outer sleeve restrains the separating movement of the pipe or pipe pile sections away from each other when placed under tension. In the case of pipe pile, a central wall separating the annular spaces at opposite ends of the coupler provides a drive ring via which one section of expanded pipe pile may coaxially drive another section of pipe pile.</p> |
