M.E. CONSTRUCTION ENG. & MANAGEMENT GUJARAT‘ TECHNOLOGICAL UNIVERSITY SNPIT&RC, UMRAKH M.E. CONSTRUCTION ENG. & MANAGEMENT CONSTRUCTION TECHNIQUES(2711402 )

“TRENCHLESS TECHNOLOGY “ PREPAID BY:- 1.LAKDAWALA MIHIR S. (140490714005) 2.PATEL TARUN J. (140490714006) 3.PATEL JATIN D. (140490714014) Guided by: Mr. Rushabh shah Assistant Professor Civil Eng. Department S.N.P.I.T. & R.C.

TRENCHLESS TECHNOLOGY

CONTENT INTRODUCTIO TRENCHLESS TECHNOLOGY METHODS PRE-REQUISTES TECHNIQUES OF TRENCHLESS TECHNOLOGY IN INDIA NEED FOR TRENCHLESS TECHNOLOGY CONCLUSION REFFRENCE

INTRODUCTION Trenchless technology is the science of installing , repairing and renewing underground pipes , ducts and cables using techniques which minimize or eliminate the need for excavation. Trenchless technology is basically making a tunnel below the surface and staling service lines like water or gas pipes, electric or telecommunication cables etc , with out any disruption to the public.

TRENCHLESS TECHNOLOGY METHODS Trenchless technology methods system have been categorized in to two groups: Two groups: 1)New installation 2)Rehabilitation and Renovation

REHABILITATION AND RENOVATION Methods including are: 1)Pipe bursting 2)Pipe eating

PRE-REQUISITES Surveys and site investigations are essential to the success and efficiency of trench less installations and repair techniques. (a)The survey results help to determine the most appropriate system (b)The investigations methods include geophysical survey ,boring and sampling ,measurement of ground water table ,test pits and trenches ,penetration tests ,examination and investigations of exiting structures.

TECHNIQUES OF TRENCHLESS TECHNOLOGY IN INDIA DIRECTIONAL DRILLING RAMMING MOLING AUGER BORING

DIRECTIONAL DRILLING Directional drilling involves steerable tunneling systems for both small and diameter lines . The first stage consists of drilling a small diameter pilot hole along the desired centre line of a proposed line and in the second stage ,the pilot hole is enlarged to the desired diameter to accommodate the utility line and to pull the utility line through the enlarged hole.

Advantages The major advantages is the speed of installation combined with the minimum environmental and social impact. Long and complicated crossing can be accomplished with a great degree of accuracy. Another advantages is that sufficient depth can be accomplished to avoid other utilities. Limitation of access and reception pits is another advantage.

Disadvantages Special equipment and very high degree of operation skill is required. As the cost of the equipment and operation are high , bore length should be sufficient in order for it to be economical. Mainly steel pipe is being installed by the method.

RAMMING In this method ,the pipe is rammed through the soil by using a device attached to the end of the pipe to drive the pipe through the soil . In this method the tool does not create a borehole . It acts as a hammer to drive the pipe through the soil . When ramming pipe ,the leading edge cuts a borehole, the spoil enters the pipe and is compacted as it as being forced to the rear of the pipe.

RAMMING DEVICE

Advantages The pipe ramming is an effective method for installing medium size pipes. The method is economic since the equipment cost is not very high and the operation is simple. The pipe can be installed in one piece or segments. This can be used in almost all types of soils. The method does not require any thrust reaction structure.

DISADVATAGES The major disadvantages is that there is no control over the line and grade and in case of obstruction like boulders , the pipe may be defected. Then work should be stopped immediately. For small diameter pipelines, the method is economical ,but for large diameter pipes, the equipment cost is high.

MOLING Moling is a method ,which forms the borehole by compressing the earth that immediately surrounds the compacting device which is underground piercing(mole)is propelled by a power source . The tool is streamlined into bullet or shape . The method is restricted to relatively small diameter lines in compressible soil condition.

MOLING DEVICE

ADVANTAGES It is a rapid , economic, and effective method of installing small diameter lines. Any type of utility line can be installed using the method. The stability of the soil around the bore hole is increased due to compaction. The investment in equipment is minimum.

DISADVANTAGES Compaction methods are limited in their length by reliability because basic systems are unintelligent ,unguided tools that tend to bury themselves ,surface in the middle road or damage existing lines.

AUGER BORING The auger horizontal earth boring is a process of simultaneously jacking casing through the earth while removing the spoil inside the casing by means of a rotating flight auger. The auger is a lighted tube having dual functions , firstly it has coupling at each end that transmit torque to the cutting head from the power source located in the bore pit and secondly ,it serves to transfer spoil back to the machine.

AUGER BORING DEVICE

ADVANTAGES The major advantages is that the casing is installed at the same time as the borehole excavation take place. This method can be used in a wide variety of soil types.

DISADVANTAGES This method requires different sized cutting heads and auger sizes or each casing diameter , which increase the investment in equipment. The investment in bore ,pit construction, and the initial setup is also required. In case of soil containing large boulders ,this method cannot be used advantageously.

NEED FOR TRENCHLESS TECHNOLOGY (1)The disadvantages and difficulties encountered in conventional trenching methods have resulted in thinking of the need for trenchless technology. (2)The advantages of the no-dig technology are also responsible for the need of this technology to be adopted in mainly urban areas.

CONCLUSION With all round developments in various fields like petrochemicals where conveyance of gas , crude and refined products over long distance is common ,telecommunication and power ,water supply and sewerage etc. Also if costs benefit analysis of the two systems is conducted ,considering both direct and in directed costs, it will help us make informed division on technology selection , under different circumstances.

references 1)www.google.com 2)www.constructor.org 3)Maninder Singh ,Techniques of Trenchless Technology In Use in India, Civil Engineering and Construction Review October 4) Trenchless technologies in pipeline construction(erschienen in 3R international Special Edition 13/2002) Vulkan- Verlag GmbH, Essen

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