MONITORING OF HDPE PIPE DURING HORIZONTAL DIRECTIONAL DRILLING INSTALLATIONS

摘要

This paper presents the results of three field installations of high-density polyethylenern(HDPE) using the Horizontal Directional Drilling (HDD) process. One each of 114 mm (4 in.)rndiameter standard dimension ratio (SDR) 17 HDPE pipe, 219 mm (8 in.) diameter SDR 17rnHDPE pipe, and 324 mm (12 in.) diameter SDR 17 HDPE pipe were installed in a cohesionlessrnsoil medium. Various testing parameters were captured during the pullback phase of these threerninstallations. These testing parameters consisted of utilizing pressure transducers to capture thernpullback and rotational pressures on the drilling rig, linear potentiometers installed inside thernHDPE pipe to measure the axial strain on the pipe, and the application of an external load cell tornquantify the loading on the pipe during the pullback phase. Comparisons of the pullback andrnrotational pressure on the drilling rig, loading on the HDPE pipe, and average and maximumrnstrain experienced by the HDPE pipe are presented with respect to the installed pipe diameter.