Pipe Bundle ø 500 mm (20 inch) - TERRA-JET DJ 23

TERRA-JET DJ 23 lays a pipe bundle consisting of 10x HDPE pressure pipes underneath a stream over a length of 60 m.
Laying of 10x HDPE Pressure Pipes underneath Small River

Along a main road in Romanshorn in the Canton Thurgau, Switzerland, a pipe bundle had to be layed underneath a small river over a length of 60 m (200 ft). The pipe bundle consisted of 10x HDPE pressure pipes. This trenchless pipe laying job was realized by an HDD specialist who operated for the Swiss Telecom. Due to limited space an open trench was not possible, especially because of the 9 m (30 ft) wide river. This job was realized by a 60 m (200 ft) long HDD bore, which undercrossed the riverbed in a depth of around 3m (10 ft).


Machine Requirements and Reaming Procedure

The pipe bundle of 10x HDPE pipes with a maximum diameter of 160 mm (6.5 inch) required a bore channel of 500 mm (20 inch). Therefore the HDD contractor had chosen the TERRA-JET DJ 23, the most powerful HDD machine of its class.

The ground consisted of gravel, clay and sand. The deeper the bore, the harder the ground conditions. The TERRA-JET DJ 23 with 11 tonnes (23‘000 lbs) thrust and pullback force and the torque of 3100 Nm (2.300 ft.lbs) drilled a pilot bore and reamed in two steps of ø 360 mm (14 inch) and ø 500 mm (20 inch). Each reaming procedure required one day. The entry and exit angle was 30 %.


Pic 1: TERRA-JET DJ 23 lays a pipe bundle consisting of 10x HDPE pressure pipes underneath a stream over a length of 60 m.

Pic 2: Pulling of the pipe bundle with 10x HDPE pipes, connected to the Flycutter ø 500 mm (20 inch).

Pic 3: The Flycutter and the pipe bundle reached the starting pit.

Pic 4: Happy contractor in front of the HDD machine TERRA-JET DJ 23 after the successful bore.


Pulling of the pipe bundle with 10x HDPE pipes, connected to the Flycutter ø 500 mm (20 inch).
The Flycutter and the pipe bundle reached the starting pit.
Happy contractor in front of the HDD machine TERRA-JET DJ 23 after the successful bore.



 up

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