Trenchless Technology
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Transcript of Trenchless Technology
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TRENCHLESS TECHNOLOGY
GUIDED BY PRESENTED BY Ms. PRAJEESHA.M.P DEEPAK.CLecturer. Semester 7,CivilDepartment of Civil Engineering. Roll No:58
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CONTENTS
• INTRODUCTION• TRENCHLESS CONSTRUCTION METHODS• TRENCHLESS RENEWAL METHODS• TRENCHLESS TECHNOLOGY IN INDIA• ADVANTAGES OF TT OVER TRADITIONAL
OPEN CUT TRENCHES• CONCLUSION
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INTRODUCTION
• TT techniques include methods of pipeline & utility installations with minimum amount of surface excavation
• TT techniques are mainly divided into two main areas: TRENCHLESS CONSTRUCTION METHODS(TCM) and TRENCHLESS RENEWAL METHODS(TRM)
• TCM includes all methods for new utility & pipeline installations
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Continuation. . . .
• TRM includes all methods of renewing, rehabilitating, or renovating an existing old or host pipeline or utility system
• Trenchless construction and renewal project is site specific & successful completion of it is dependent on factors such as accuracy, maximum installation length, diameter range, & type of application
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CONSTRENCHLESS TRUCTION METHODS
• Divided into two major categories: - HORIZONTAL EARTH BORING - PIPE JACKING / UTILITY TUNNELING
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HORIZONTAL EARTH BORING
• It includes - Auger Boring - Moling - Pipe Ramming - Water Jetting - Microtunneling
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AUGER BORING
• Used for installation of steel pipes and casings, especially under railways & road embankments
• Very economical• It reduces damage to pavements and
disruption to traffic, hence reduces social costs associated with pipeline installations
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Fig.1: AUGER BORING MACHINE
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MOLING
• Used for laying water pipes • During moling process, a pneumatically
driven machine known as a mole forces its way through the soil along the desired path of the pipe
• Mole is a steel cylinder about 60cm long and 6cm in diameter, works as a pneumatic cylinder with pulsed compressed air causing the head of the mole to repeatedly hammer against the soil in front of the mole
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Fig.2: MOLE
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PIPE RAMMING
• Used for installation of steel pipes and casings over distances usually upto 30m long and upto 1.5m in dia
• It is also used for shallow installations under railway lines and roads
• It can be applied for horizontal as well as vertical installations
• Method is pneumatic
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WATER JETTING
• Method is simple • It uses high speed jet of water to liquefy
and remove soil• Special nozzle is attached to the end of a
solid rod & extended into the bore hole• Disadvantages:- - poor control of overcut - disposal of large quantities of water and muck - possibility of ground settlement
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MICROTUNNELING
• Used to construct small tunnels for laying gravity pipe lines
• Microtunnel boring machines are operated remotely
• Operator controls the machine from a control room on the surface of ground
• Most machines also have video cameras set up to give more information
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PIPE JACKING
Jacking Procedure:
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Fig.4: STEPS IN PIPE JACKING
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TRENCHLESS RENEWAL METHODS
• TRM can be categorized into the following types:
- Coatings - Sliplining - Pipe Bursting - Cured-in-place pipe - Grout
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COATINGS
• To repair cracks in the original pipe, or to protect it from corrosive wastewaters or mechanical abrasion
• Coating is applied to the interior of the deteriorated pipe manually
• Coatings are applied by spray, brush, trowel, or roller
• Must be applied to clean, dry surface• Advantage is that no extra work or
equipment is necessary
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SLIPLINING
• A flexible pipe of slightly smaller dia is slid through an existing pipe
• Used to repair leaks or restore structural stability to an existing pipeline
• Completed by installing a small carrier pipe into a large host pipe grouting the annular space between the two pipes
• Materials used are high density polyethylene, fibre reinforced plastic, polyvinyl chloride
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PIPE BURSTING
Fig.5: PIPE REPLACEMENT BY PIPE BURSTING
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CURED-IN-PLACE PIPE
• CIPP is typically a flexible tube constructed of non woven polyester felt material impregnated with a resin that hardens after installation
• Water pressure is produced with a stand pipe
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A resin saturated, coated filled tube is inverted(left) or pulled (right) into a damaged pipe
Next, hot water or steam is used to cure the resin & form a tight-fitting, jointless & corrosion-resistant replacement pipe Fig.7: CIPP process
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GROUT
• Grout is actually a variety of materials used to fill voids, stabilize soil, hold bricks in place, coat cement, & prevent infiltration
• A typical grouting application in new construction is to seal the joints between segmented concrete pipe
• It seal off ground water infiltration in nonpressure pipelines
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TRENCHLESS TECHNOLOGY IN INDIA
• Need for adoption of trenchless technology in India
• Trenchless market
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DISADVANTAGES OF TRADITIONAL OPEN TRENCH METHOD
• It involves excavation, pipe removal, pipe replacement, backfilling, and site restoration
• Pumping may be required in areas with a high water table
• Using open trench methods to install or repair underground utilities will invariably cause disruption to normal activities
• Traffic may be blocked, surface operations may be interrupted, & an open trench itself presents a danger
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BENEFITS OF TRENCHLESS TECHNOLOGY
• Excavation is not necessary between access points
• Require less space underground, minimizing chances of interfering with existing utilities or abandoned pipes
• Are generally quiet and nondisruptive• Require less exposed working area &
therefore are safer for both workers & the community
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CONCLUSION
• Most recent developments in TT is the use of robotics
• Robots are able to enter hazardous environments
• TT robots are able to provide users with digital data
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REFERENCES
1. Mohammad Najafi, Sanjiv Gokhale, Trenchless Technology, Mc Graw-Hill Professional Publications.2. Steven R Kramer, William Jesse McDonald, James C Thomson,An intoduction to trenchless technology3. Steve Orchad “Directional Drilling And Assoctated Technolagies” No-Dig International Journal, November 20084. Public Works Technical Bulletin 420-49-10, 28 February 1999.5. Brij D.K.Gunjal, 1996, “Trenchless Technology in India”:366-368.6. www.Trechlessonline.Com7. www.tttechnologies.com
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THANK YOU