The Greenway The HDD Professionals.
Greenway Contracting LLC Head office is located in Emirates of Dubai, U.A.E, We are specializes in the application of Trenchless technologies, Electrical cable laying and associated civil works.
Our focus and objective is always the safe completion of drilling and installation to ensure the health and well-being of not only our team members, but all others related to each project.
At Greenway Contracting LLC, we also take our responsibilities very seriously when it comes to environmental protection and adhere strictly to all regulations, policies and procedures. You can count on our professionalism, expertise and experience to get the job done accurately, safely and successfully each and every time on bore holes ranging from 2” to 24” and distances of up to 410 meters in length.
The company continues to deliver and improve on objectives through a multi skilled workforce, Greenway Contracting LLC service consists of:
Focusing on Client objectives and providing added value.Continuously improving Trenchless Technologies and Management Processes.
Making Health and Safety a priority in all business activities.
Managing impact on the environment.
High business principles and values.
Developing arrangements to meet future requirements and developments in the industry.
Profitably Managing the Business.
Through sharing knowledge and best practice Greenway Contracting LLC continues to establish new clientele as well as maintain and develop existing relationships
Only then we can really be enthusiastic and take pride of the Vision we have embarked on.
We are your partner and we are "Building Your Way for the Future".
For Greenway Contracting LLC
Dubai.U.A.E
Contact us.
Organization Chart.
Directional Drilling Machines
A major use for HDD is installing high pressure gas and oil pipelines under obstacles like waterways, airports, and major roads and other large natural features or urban structures. By putting the pipeline deep underground, often in solid rock, it's protected from damage by dredging, anchors or surface trenching. It also protects it from accidental or deliberate damage, helping to manage risk and eliminate threats to the pipeline.As with gas and oil, HDD can be used to carry water and sewerage pipelines under and around almost anything. Lucas has also used HDD to drill directly into deep underground sewer tunnels. Apart from avoiding the cost and disruption of surface trenching, HDD's ability to maintain a precise gradient and travel deep underground has dramatically reduced the need for pumping stations, simplifying the sewerage system and reducing long-term costs.
As well as carrying conduits for fiber optic cables beneath rivers and other obstacles, Lucas has used HDD to carry them to near-inaccessible mountain tops and microwave transmission towers. By placing them deep into bedrock beneath the coastal sands and surf zone, these fiber-optic cables are protected in the most vulnerable part of their route.
High-tension cables can be placed deep underground, protected from damage and avoiding surface obstacles.
HDD has a wide variety of environmental uses: draining landslip-prone hillsides, extracting methane gas from coal seams before mining, restoring sand to beaches, creating underground barriers to reduce movement of contaminants, draining slag heaps and rubbish dumps.
Directional Drilling Method Statement
Purpose: Install utilities (Pipes & or cables) underground, without disturbing ground surface.
ü 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.
ü 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.
ü 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.
ü Prepare the drilling location with all necessary safety materials, machines and required length and dia meter of HDPE pipes joined together using butt fusion welding machine.
ü The machine (drill unit) is anchored to the ground, location supposed to be the entry pit with anchor stakes for proper fixing the machine.
ü 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.
ü Fluid mixing system (Bentonite mixer): the Ditch Witch FM 13 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.
ü 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.
ü The locater: 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.
ü 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.
ü 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 110mm, 200mm, 225mm, 300mm,350mm,380mm, 415mm, 450mm and 480mm so as to be used for installation pipes diameter differing from 100mm,110mm,160mm,180mm,200mm,315mm,400mm and also installing number of pipes together like 3 way,4 way and 6 way of 100 mm and 110 mm,
3-way and 4 ways of 160mm, 180mm pipes and also 3-way of 200mm pipes.
ü The back reaming: when the drill head is received in the exit pit it is then de-attached from the drill pipes and a back reamer is attached to it which is then pulled back to the entry side using slurry with a pressure depending on the soil condition (30 gal per minute for normal soil). The back reaming process is made a number of times in different sizes to reach the required size of drill whole for the pipe to freely run through it.
ü 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.
ü 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.
ü 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 2mm at a period of six months and not more than 5mm at a period of one year. The formula for maximum surface settlement is:
Smax = 0.313 VLD2/i
D excavated diameter of bore/tunnel
I 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
As per O’Reilly and New proposal the relation between i and Zo for normal soil is:
i = 0.28Zo – 0.12
Pilot Detail History
During Drilling we are main ting record of each Pilot for our client reference's.
Daily Site ReportClient : Date :
Consultant : Project No. :
Utilities check list: Type of Drilling :
Rod No. / Position of pilot Head / Angle / Depth
Remarks : ______
______
______
Site Supervisor Client Representative
SITE SAFETY CHECK LISTS
Contract Ref:Date of Inspection : Time :
Work Description / Location :
Sl. No. / Item to be checked / If OK
√ / Not OK
Х / Not Applicable / Remarks
1. / Wear appropriate Personal Protective Equipment (P.P.E.), e.g. helmets, safety shoes, goggles, masks, gloves, safety belts, ear plugs etc.
2. / Accident & Near misses recorded & investigated
3. / Safety & Warning signs placed
4. / Safe pedestrian access to buildings and roads to be provided
5. / Protection & support to under-ground utility services
6. / Sides are shored / sheathed
7. / Open excavated area being barricaded
8. / Road side / Public area to be warned with flashing lights during night time
9. / No Environmental Impact
10. / Excavated material are stacked properly
11. / Site kept clean
12. / Electrical sockets, connections, lifting equipments and machineries
13. / First Aid Kit
14. / Proper lighting arrangement during night work
Notes :
……………………………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………………………
Name of Inspector: …………………………………………………. Signature: …………………………………
Butt Welding of PE pipes
Butt Welding is the most common method to joint HDPE pipes, stub ends, tees, elbow, bends etc.
The pieces to be welded are not added any welding material but the surfaces to be pointed are heated up by means of a heater plate. The melted surfaces are then pressed together and the molecule chains will thus intrude each other and form a strong joint. There is no chemical connection between the molecule chains; the strength of the joint is based mainly on cohesion between the molecules.
The pressure applied in the weld will vary from stage to stage of the welding operation. For each size of a welding machine the respective hydraulic pressures to be used for different outside diameters and wall thickness.
Provided that the pipe ends are properly trimmed butted and aligned, the ends softened by the heat will fuse and will remain so when the weld cools. A small bead has been formed inside and outside during the operation.
The butt-welding is carried out with machines specially designed for this purpose. The machines have a strong body frame, guide rods for the pipe end trimmer electric heater plate. The compressive thrust is produced hydraulically or by means of lever or spring mechanism. To achieve a good welding result one always has to use a machine for the operation.
Working Procedure
The Butt fusion operation is divided in to the following steps:
- Fixing of pipe to the machine
- Aligning and trimming of pipe ends
- Heating up of surfaces to be welded
- Removal of heater plate
- Welding
- Cooling
- Dismantling of the pipe from the machine Inspection
Project References
Client : Dubai Municipality
Location : U.A.E. (Dubai)
Scope of Work : Directional Drilling
Purpose : DEWA Power cable (HV and LV cables)
Pipe Type : H D P E
Diameter of Pipe User : 110 mm / 160 mm
Length of Drilling : 2000 Lm
Work Schedule : 2007, completed
Machines Use : Ditch Witch 2720, Trailer, and Water Tanker and
Mitsubishi Pickup with Hulbe Crane
Manpower : Drilling Team of 6 Persons
HDPE pipe welding Team of 3 persons
Client : Time Electro & Contracting Company
Location : U.A.E (Dubai, Abu Dhabi )
Scope of Work : Directional Drilling
Purpose : HV and LV cables for DEWA & ADEWA
Pipe Type : H D P E
Diameter of Pipe User : 110 mm / 160 mm / 200 mm
Length of Drilling : 1500 Lm
Work Schedule : 900 Lm completed and still going on
Machines Use : Ditch Witch 2720, Trailer, and Water Tanker and
Mitsubishi Pickup with Hulbe Crane
Manpower : Drilling Team of 6 Persons
Client : K.C.C (Kuwait Contracting Company)
Location : U.A.E. (Dubai)
Scope of Work : Directional Drilling
Purpose : DEWA Power cable (HV and LV cables)
Pipe Type : H D P E
Diameter of Pipe User : 110 mm / 160 mm
Length of Drilling :250 Lm
Work Schedule : 2007, on going
Machines Use : Ditch Witch 2720, Trailer, and Water Tanker and
Mitsubishi Pickup with Hulbe Crane
Manpower : Drilling Team of 6 Persons
HDPE pipe welding Team of 3 persons
Client : Ghantoot Gulf Contracting.
Location : U.A.E. (Dubai)
Scope of Work : Directional Drilling.
Purpose : DEWA Power cable (HV and LV cables)
Pipe Type : H D P E
Diameter of Pipe User : 110 mm / 160 mm
Length of Drilling :850 Lm
Work Schedule : 2007, on going
Machines Use : Ditch Witch 2720, Trailer, and Water Tanker and
Mitsubishi Pickup with Hulbe Crane
Manpower : Drilling Team of 6 Persons
HDPE pipe welding Team of 3 persons
Client Centaur Electromechanical Contracting Company
Location : U.A.E (Dubai - Jabel Ali)
Scope of Work : Directional Drilling
Purpose : HV cables