The Fat Lady Has Sung - TR 565 in Hongkong

© TERRA AG, Reiden, Switzerland
A 535 m (1'800 ft) long HDD bore was to be installed for a new waste water system on an island near Hong Kong. For environmental safety reasons the first 105 m (350 ft) beneath the mainland must be protected by a steel casing. To achieve this, a 1400 mm (55") steel pipe needed to be installed as an exterior protective sleeve for the first 18 m (60 ft). Thereafter a 1200 mm (47") steel pipe would be rammed into the sea bed for a length of 105 m (350 ft). For this most challenging task, contractor Paul Y Construction Ltd. chose the TERRAHAMMER TR 565, which was affectionately nicknamed "the fat lady". Even with the ramming power of 2`400 tons this was a challenge for "the fat lady". To facilitate the successful ram, TERRA's engineers proposed that Paul Y Construction undertake a lubricated pipe ram, using a specialised bentonite mix as is common in HDD drilling operations. Following this methodology, the 1200 mm (47") steel pipe was successfully rammed in for the required 105 m (350 ft). A 350 ton pull-back HDD rig was then able top commence with the pilot bore for the new 800 mm (32") pipe, which was installed through the steel pipe rammed


TERRA AG für Tiefbautechnik - Hauptstrasse 92 - 6260 Reiden - Schweiz - Tel. +41 62 749 10 10 -