LABORATORY AND FULL SCALE TESTING OF A PULL-IN-PLACE PVC PIPE

摘要

The Horizontal Directional Drilling (HDD) installation industry is one of the fastest growingrnindustries in the North American underground construction sector, representing a commandingrnshare of utility services installed in urbanized areas. The growing need for renewal of the buriedrnmunicipal infrastructure in urban areas focused much attention on HDD as a technically viablernand cost effective method for the installation of water distribution systems and pressurizedrnsanitary sewers with minimum surface disturbance. Consequently, there is a growing need for arnvariety of pipe products that meet relevant AWWA and CSA standards and are suitable forrninstallation using the HDD method. The paper describes the development and testing of a newrnrestrained joint for rigid pipes that enables the installation of standard C-900 bell-and-spigotrnpipes using the HDD or Pipe Bursting (PB) construction methods. In particular, the paper willrncover the design concept, and laboratory testing for tension and bending, finite element modelingrnof the new joint and the results of a full-scale field test. The latter involved the installation usingrna HDD rig of an 110m long, 100mm diameter, bell-and-spigot C-900 PVC pipe column thatrnutilized the new restrained joint. The pull-head as well as the two leading joints wererninstrumented to measure the tensile and shear stains that developed in the pipe during therninstallation.