Underground Tunnel Construction - Al Nubla General Contracting Company LLC

In early 1997, Al Nubla General Contracting Company LLC launched our tunneling division using state-of-the-art micro-tunneling technology and pipe jacking method. Since that time, we have successfully constructed more than 80 KM of pipelines of varying diameters by the non-disruptive method using the ISEKI TCC 600, ISEKI TCC 800, HERRENKNECHT AVN 600, AVN 800B, AVN 800A, AVN 1000, AVN 1200, AVN 1400, AVN 1600, AVN 1800 & AVN 2500 micro-tunneling machines in diverse ground conditions, with and without groundwater tables at different soil strata. Pipelines constructed by the non-disruptive method were primarily in the Emirate of Abu Dhabi for clients such as Abu Dhabi Municipality, Abu Dhabi Sewerage Services Company (ADSSC), public works, ADWEA & TRANSCO (ADDC). We have also carried out tunneling works in Dubai for Dubai Municipality and M/s. DEWA, as well as in Sharjah and Ajman for the local municipalities. The construction of pipelines utilizing the non-disruptive method has been carried out by using micro-tunneling technologies in two ways (a) by encasing the carrier pipe, which in most cases is GRP/GRE with reinforced concrete, and jacking it directly to the correct line and level or (b) by jacking a steel or RC pipe as a sleeve, installing the carrier pipe inside it, and grouting the annulus space by a non-shrink grout or a foam concrete.

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