International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Introduction to advanced TUNNEL Formwork system: Case study of ‘Rohan - Abhilasha’ Mr. Manas A. Shalgar1, Mr. Tejas D. Aradhye2 1.
Post graduate student, Department of Civil Engineering, Maharashtra Institute of Technology, Pune (Maharashtra, India).
Civil Engineer (ME-Construction and Management), Rohan Builders India Pvt. Pune. (Maharashtra, India) ---------------------------------------------------------------------***--------------------------------------------------------------------2.
Abstract: Now a day construction industry is becoming very time conscious. Time (i.e project completion time) or duration of the project is very important factor in construction industries these days. The quote “ Time is money” is becoming truth, because time loss is ultimately money loss. Also as current situation of labour availability is very less, so industry should move from labour oriented to machine oriented. And formwork is best factor where we can move from labour to machine. Formwork perform key role in construction, in time as well as costs. Only formwork costs nearly 25% of total project cost. We know the complications & wastage in construction by using conventional formwork system. So we moved to formworks like mivan, aluminium for simplicity and good finish, but it is not enough. As we discussed time factor, by using systems like mivan, aluminum off course there is time saving but not up to that extent. So there is new emerging technology named TUNNEL formwork. Which is much beneficial than that of aluminium or mivan formwork. This paper describes the introduction to advanced TUNNEL formwork.
formwork system. Formwork should be properly designed, fabricated, and erected to receive fresh concrete. If formwork is not done properly the desired shape of concrete is not possible. When concrete is compacted, it exerts pressure and the formwork must be strong and stable to take this pressure. The form should be leak proof to retain the concrete & slurry. Advanced Tunnel formwork identified to be suitable for Indian conditions for mass construction, where quality and speed can be achieved at high level. The speed of construction by this system will surpass speed of most of the other construction systems. The labour in coordination with heavy machineries (eg. tower crane) handles this method effectively to speed up the construction, to assure quality control and durability. Adoption of this system reduces overall cost of the structure. This paper mainly focuses on advanced tunnel formwork systems, its components, working cycle and its benefits based on speed and economy.
2. OBJECTIVE Objective of this paper is to introduce Indian construction industry to advanced TUNNEL formwork systems which is rapid and if used effectively ultimately economical based on, a. Components b. Working cycle c. Economy. d. Benefits and disadvantages.
Key Words: TUNNEL formwork, slab cycle, economy, time saving. 1. INTRODUCTION Indian construction is known for its use of conventional/ typical formwork system, and it has not adapted advanced formwork systems in RCC works compared to developed nations. Formwork plays vital role in RCC framed / load bearing structures. Formwork is a mould or die used to shape and support the concrete until it attains sufficient strength to carry its own weight. The formwork is a kind of “baking tin”, which holds the concrete until it hardens to attain the required shape and size. Formwork constitutes 30% of the cost and 60% of the time in concrete construction. Quality of concrete finish and soundness of concrete depends very much on the
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3. THEORETICAL CONTENT 3.1 Current trends in formwork systems. At present in Indian construction industry various types of formwork systems being used. Based on type of material, purpose of use and method of erection formwork systems listed as follows. 1. Conventional formwork. 2. Climbing formwork system.
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