CONTACT US
- +971 4 2510057
- gsndrc@gulfstardrainage.ae
- As per the drawings provided for the location where directional drilling works to be carried out, detailed information of the existing utilities, proposed route drawings and references marks.
- Carry out survey to locate all existing utilities by making trail pits and by using Electronic detectors if necessary to trace underground utilities and then to make soil test to understand the ground condition. A surface level is taken prior to all Drilling works.
- Make a bore plan (profile)clearly mentioning all existing utilities, exact location of entry and exit pits and the different levels in which the directional drilling (Pilot bore) is to be carried out.
- Prepare the drilling location with all necessary safety materials, machines and required length and diameter of HDPE pipes joined together using butt fusion welding machine.
SERVICE DETAILS
Reaming & Pullback
Enlarging the pilot hole is accomplished using either prereaming passes prior to pipe installation or simultaneously during pipe installation. Reaming tools typically consist of a circular array of cutters and drilling fluid jets and are often custom made by contractors for a particular hole size or type of soil.
Monitering
The pilot hole path may also be tracked using a surface monitoring system called locator.The locator is an electronic signal receiver is used to track the pilot from the ground surface. This helps the head to deviate to desired angle and depth as the pilot is pushed by the drilling unit without rotating and later drilled by pushing and rotating the pilot.When the drill head reaches the planned destination it is steered to the ground surface and obtained in the receiving place on exit pit made.
The reamer
The back reamer is designed and made in different shapes and sizes so as to reach the user requirement according to the soil condition and size of the pipe to be installed as the size differs from diameter 200mm, 300mm,400mm and 500mm so as to be used for installation
Pipe installing
A swivel is attached to the back reamer, connected to the pipes to be installed, towing to the machine (entry pit) side. Back reaming and pulling the pipes at the same times will allow the pipes to be installed underground without excavation, during this process the drill fluid will assist the lubrication factor and creating a slurried area around the drill hole for the pipe to be installed without any void.
The back reaming and pull back will continue until reamer and pipes reach the launch side of the directional drilling, then disconnect swivel and towing head from the pipes will complete the drilling work.
A surface level is again repeated later six months and one year after the directional drilling job is finished as for the surface settlement limit is not more than 2 mm at period of six months and not more than 5 mm at period of one year.
The formula for maximum surface settlement is : Smax = 0.313 VLD2/i D excavated diameter of bore/tunnel distance form bore/tunnel centerline to point of inflexion of settlement trough Smax maximum settlement with a settlement trough VL volume loss as ratio of notional excavated volume of tunnel
The machine (drill unit)
is anchored to the ground, location supposed to be the entry pit with anchor stakes for proper fixing the machine.
The pilot
a sonde contained metal body with angled bit is drilled into the ground in the desired angle as to start the pilot bore as per the bore plan or profile made
Heat Exchanger Cleaning
the machine mixing system comes with a 1000 gal mixing capacity and can attain a maximum flow rate of 300 gal per minute. Normal flow rate used is 10 gal per minute during pilot bore and 30 gal per minute during back reaming/pipe pulling.
The fluid
a mixture of Bentonite (pure clay oil) and water mixed in a proper proportion to obtain good slurry is sprayed with pressure through the pilot head (angle bit) at 10gal per minute to lubricate the drill procedure and to cool the electronic tracking device sonde inside the pilot.