Geotechnical Services

Drilling & Grouting

In the last few years, the necessity of Drilling and Grouting method has increased due to the limitation of the dewatering capacity and high number of karst features found in the rock formations during the excavation phase.

In terms of continues development, Geotunnel has established new section for cement grouting activities which can be employed for in karst feature filling, permeation grouting soil nailing and rock bolting which minimizes the risk of excessive water inflows and soil collapsing during excavation.

Shotcreting

Shotcrete is applied pneumatically onto a surface through hose at high velocity. It is made up of a mixture of cement, aggregate with maximum aggregate size of 5 or 10 mm and water, optional admixtures or additives, which developed its properties through the hydration of the cement. Using the wet mix method and the automatic spraying robot which is owned by Geotunnel, it provides a safe working environment in excavations with small rebound of about 5 to 10%.

Piling Works

Piling rigs can be used to aid in the excavation of shafts, trenches, or pits. Geotunnel has successfully implemented excavation method using piling rigs for shafts with various diameters and depths. Consists of piling rig drilling a specific pattern of holes within the shaft envelope, which enables a faster excavation cycle and allows for time and cost savings as well as improved safety.

Geotunnel has two piling rigs which are manufactured by Bauer: BG 28 and BG 11H. BG 28 (larger) can reach up to 50m depth and BG 11 H (smaller) can reach up to 28m depth.