TRENCHLESS TECHNOLOGY. Department of Civil Engineering.
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1 TRENCHLESS TECHNOLOGY GUIDED BY Ms. PRAJEESHA.M.P Lecturer. Department of Civil Engineering. PRESENTED BY DEEPAK.C Semester 7,Civil Roll No:58
2 CONTENTS INTRODUCTION TRENCHLESS CONSTRUCTION METHODS TRENCHLESS RENEWAL METHODS TRENCHLESS TECHNOLOGY IN INDIA ADVANTAGES OF TT OVER TRADITIONAL OPEN CUT TRENCHES CONCLUSION
3 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
4 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
5 CONSTRENCHLESS TRUCTION METHODS Divided into two major categories: - HORIZONTAL EARTH BORING - PIPE JACKING / UTILITY TUNNELING
6 HORIZONTAL EARTH BORING It includes - Auger Boring - Moling - Pipe Ramming - Water Jetting - Microtunneling
7 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
8 Fig.1: AUGER BORING MACHINE
9 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
10 Fig.2: MOLE
11 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
12 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
13 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
14 Jacking Procedure: PIPE JACKING
15
16 Fig.4: STEPS IN PIPE JACKING
17 TRENCHLESS RENEWAL METHODS TRM can be categorized into the following types: - Coatings - Sliplining - Pipe Bursting - Cured-in-place pipe - Grout
18 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
19 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
20 PIPE BURSTING Fig.5: PIPE REPLACEMENT BY PIPE BURSTING
21 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
22 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
23 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
24 TRENCHLESS TECHNOLOGY IN INDIA Need for adoption of trenchless technology in India Trenchless market
25 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
26 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
27 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
28 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 technology 3. Steve Orchad Directional Drilling And Assoctated Technolagies No-Dig International Journal, November Public Works Technical Bulletin , 28 February Brij D.K.Gunjal, 1996, Trenchless Technology in India :
29 THANK YOU
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