Pipes Laying by HDD and DMA Construction
HDD – Horizontal Direct Drilling and DMA – District Metering Area
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What is Horizontal Directional Drilling
Horizontal Directional Drilling (HDD) is a method of trenchless methods, viz., installing underground pipelines, cables and services without open cut/trench.
MACHINES WE CAN USE:
ZT-120/180 HDD Machine
A ZT 120/180 HDD machine (180-ton capacity) has properties as follows:
Performance and capabilities
- Torque: 78000 Nm.
- Rotation speed: 0–110 rpm.
- Walking speed: 0–3 km/h.
- Mud pump displacement: 850 L/min.
- Mud pump pressure: 10 MPa.
- Entry angle: 8–18°.
- Reamer sizes: Φ400 – Φ1500 mm.
- Weight: 29,000 kg.
- Dimensions: 12,100×2,900×2,950mm.
- Rod size: Φ127 x 6000 mm.
ZT60/120A HDD Machine
ZT60/120A is a A ZT 120/180 HDD machine (60-ton capacity) has properties as follows:
Performance and capabilities
- Max Pulling Force: 600 / 1200 kN (60 / 120 tons)
- Max Thrusting Force: 600 / 1200 kN (60 / 120 tons)
- Torque: 30000 N.m
- Engine: Cummins (194KW / 264KW)
- Max Mud Pump Displacement: 760 L/min
- Weight: 20,000Kg
- Dimensions (L x W x H): 9600 x 2500 x 2500 mm
- Rod Size: Φ89 x 4500mm
ZT-42A HDD Machine
A ZT-42A HDD machine (42-ton capacity) has properties as follows:
Performance and capabilities
- Torque: 18500𝑁.𝑚 max,
- Rotation speed: 0−165 rpm
- Mud pump pressure: 8.0MPa max
- Mud pump displacement: 450 L/min max
- Walking speed: 2.3 km/h
- Entry angle: 8−20∘
- Reamer sizes: Φ200−Φ900
- Weight: 14000kg
- Dimensions: 6980×2280×2500mm
- Rod size: Φ83×3000mm
Directional drilling is a three-stage process:
Pilot Hole
Drilling fluid is pumped through the drill pipe to the drill bit where high-pressure jets and the bit will grind the soils ahead of the drill stem. The drilling fluid will also carry the cuttings back to the entrance pit at the drill rig. Tracking of the pilot hole can be done in several ways depending on the size and complexity of the shot. There is a transmitter or steering tool located near the drill head which sends a signal to the location engineer giving the exact coordinates of the drill stem. Readings are constantly taken which check the depth, alignment and percent slope of the drill head.
Corrections will be made by the operator and locator to keep the pilot hole along the predetermined bore path. Upon reaching the exit point, the beacon housing and bit is detached and replaced with a reamer.
Pre-Reaming
A reamer is pulled back and rotated while pumping drilling fluid to cut and remove solids to enlarge the hole. Bentonite and other additives will be used to ensure a clean and stable hole. Bentonite is used to create a “cake layer” around the outside of the hole during pre-reaming.
Pipe Pullback
The final step is the pullback of the pipe within the pre-reamed hole. The drill rod and reamer will be attached to a swivel, which is utilized between the product line and the reamer to prevent any torsional stress from the rotating drill string being transferred to the product pipe. As the product pipe is pulled into the drill hole, drilling fluid is pumped downhole to provide lubrication to the product pipe.
We have the experience to design & construct full Water Supply Network known as District Metering System (DMA) / pressurized system. AES completed the projects by the name of our team or collaboration with others companies as follows (we work all over Bangladesh):
Experiance
Completed Dhaka WASA DMA and Paurashava Water Supply Pipeline Projects. Thereupon commissioned the projects after installation of PRV/RSV/SV/GV/NRV/BWM/HC etc. District Metering Authority (DMA) is known as pressurized system which furnished by pressure test, system test & finally by water balance tests (about 65,000no. of HC) as well as submitted pressure test – system test – water balance reports to the client Dhaka-WASA and Department of Public Health Engineering (DPHE).
We Collaborately Work with:
- National Construction Company Ltd., BD, ICB 2.1, and
- Cobra Tedagua, Spain JV, ICB 2.5
Name of the Project:
Dhaka Water Supply Sector Development Project (DWSSDP), Dhaka WASA, Bangladesh.
Feature of the aforesaid Project:
- of DMA- completed Design, Drawing, as built and handed Over – 11 no.
- Total Pipeline Length: About 220km
- HDD: about 160km
- Open Trench: about 40km
- Bursting: about 10Km
- House Connection: About 65,000 no.
- Big/Small Water Tight RCC Chamber: 240
- Installation of PSV/PRV: 40 no.
- Assessed DTW: 56 no.
- pressure / system / water balance test and related reports: 33 no.
HDD & Others Works for Others Organisation
- Department pf Public Health Engineering (DPHE), GoB: Completed about 30km of HDD Works.
- Power Development Board (PDB), GoB & Private: Completed about 20km of HDD Works.
- Ductile Iron (DI) Pipes: Ductile Iron Pipe: Gob: Completed about 10.0Km.
- Open Trench with HDPE & UPVC Pipes: Open Trench with Sand Bed, GoB & Private: Completed about 40.0Km.
- Civil Construction Works, Gob (DPHE): Construction-supervision:
- 600-700cum Over Head Tank – 05,
- 600/700cum GW/SW Water Treatment Plant – 05
- Office Buildings, 2 storied – 05,
- 25km Drains – 25 Km &
- Pit Latrines – about 1500 no.
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