公开(公告)号：US5427475A

公开(公告)日：1995-06-27

申请号：US199715

申请日：1994-02-22

Applicant: Timothy R. Coss

Inventor： Timothy R. Coss

IPC: E21B7/20 ,  E21B7/28 ,  E21B10/00 ,  F16L1/032 ,  F16L1/028

CPC classification number: E21B7/28 ,  E21B10/00 ,  E21B7/205 ,  F16L1/032

Abstract: A corrective trenchless pipeline installation method basically includes the operational steps of, first, forming a substantially irregular initial pilot hole underground in earthen matter between a pair of spaced entry and exit pits formed in the earthen matter, second, reforming the substantially irregular initial pilot hole into a substantially straight corrected pilot hole, third, reaming the corrected pilot hole to provide an expanded straight pilot hole, and, fourth, pulling a pipeline through the expanded corrected pilot hole. In reforming the irregular initial pilot hole to the straight corrected pilot hole a cutter blade is concurrently reciprocated back and forth through the irregular pilot hole and rotated relative to the irregular pilot hole to form the corrected straight pilot hole therefrom.

Abstract translation: 一种纠正无开挖管道安装方法基本上包括以下操作步骤：首先，在形成于土壤物体中的一对间隔开的入口和出口凹坑之间，在土壤中形成基本不规则的初始导向孔，第二，重建基本上不规则的初始导向孔 进入基本上直的校正导向孔，第三，使修正后的导向孔扩孔以提供扩张的直接导向孔，第四，通过扩大的校正导向孔拉动管道。 在将不规则的初始导向孔重新设置到直线校正导向孔时，切割刀片同时经由不规则导向孔往复运动，并相对于不规则导向孔旋转，从而形成校正后的直通孔。