Comparative Study of Jump Formwork with Conventional Formwork

In tall-building construction with reinforced concrete structures, enormous efforts for enhancing formwork efficiency are invested in ensuring successful project completion. Formwork operations represent approximately 25% of the total construction duration and directly affect subsequent construction activities, such as electrical, mechanical, and finishing work. To secure the business value of the project, tall-building projects also require reduced cycle times per floor, so many modular formwork systems with standard-sized and prefabricated forms, such as aluminum forms and Sky deck(PERI GmbH, Weissenhorn, Germany)are used to make formwork erection easier. Furthermore, systems with mechanical devices such as auto climbing systems (ACSs) are introduced for automating the formwork construction process. As trends toward simplification of structural systems and lack of skilled labor continue. One of the more-useful alternatives for improving the productivity of horizontal formwork. In applying the table formwork method, the lifting system is one of the crucial factors affecting productivity and costs for table formwork operation. The rental of the lifting system accounts for a large portion of the total formwork costs, and the capacity and operating processes largely determine the idle time between activities. The tower crane (T/C) method is used generally for vertical transportation of table forms with other materials. However, this lifting method causes productivity losses by frequent idle times occurring at the stripping floor because the T/C has to support table forms during their transportation and installation. Moreover, an increase in lifting loads for the T/C can lead to an increase in the planned cycle times for the concrete framework. To address these problems, several construction sites have recently usedindependent lifting systems. To lift the table forms, the system raises the lifting platform itself through independent lifting masts (DOKA GmbH, Amstetten, Austria) or uses a winch attached above the platform (PERI GmbH, Weissenhorn, Germany), which enables the crane-independent transportation of table forms. However, the initial setup of these systems requires much time, and the initial cost increases significantly because of their complicated configurations and heavy weight. Moreover, subsidiary work for raising and fixing the system itself might be repeatedly required, depending on the progress of construction work. ● Generally, jump formwork systems comprise the formwork and working platform for cleaning/fixing of the formwork, steel fixing and concreting. ● Jump formwork, often described as climbing formwork. It is suitable for construction of

● It is highly productive system design to increases speed and efficiency while minimizing labor and time.

1. Normal jump or climbing form 2. Guided – jump form 3. Self- climbing jump form

[2.3] Hisham A. Abou Ibrahim & Farook R. Hamzeh – ( 2015):The importance of advanced high-rise formwork systems in streamlining the workflow of concrete and other downstream activities, allowing for better resource allocation, more waste reduction, smaller work batches, less inventory, and safer working environment. Advanced formwork systems provide innovative solutions for today‘s complex high-rise developments, and open the doors for greater improvements in Take time calculation. [2.4] Hisham A. Abou Ibrahim & Farook R. Hamzeh – ( 2015) : This paper describes an advanced scheduling methodology that is part of a research program devoted to the topic of Location Based Repetitive Scheduling Method for housing projects in India. Now a day there is a cut throat competition in all fields of Engineering and construction in India. To gain the success in the field of construction in these evolving times, project managers must emphasize efficiency in all aspects of their operations, including resource flow process, mainly the labor crew performance. Most often project manager has to plan location based repetitive projects. [2.5] Ramesh Kannan.Ma & Helen Santhi. Ma (2013): One of the most important requirements is the advancement in forming technology. Though the conventional or traditional method of forming high-rise building is economical, it suffers seriously on the time, quality, safety and sustainability factors. The advanced systems known as climbing formwork was introduced later. The climbing formwork is relatively new technology developed from the slipform in late 1960s. A valid comparison of different climbing formwork with the conventional formwork is done for the lift core-wall in the 20 storey high-rise building model using Building Information Modeling (BIM).

Following parameters were compared, 1. Shuttering area 2. Reinforcement binding 3. Concrete with RMC 4. Brick masonry

6. External plaster Quantities for comparison for both formworks are calculated for all items and work which require formwork.

Following assumptions are obtained from data collected by site visit at OMKAR 1973, Worli. 1. Jump form we consider 35 repetitions. 2. In conventional shuttering consider 10 repetitions. For both systems concreting is done with RMC using concrete pump and Tower crane. No external plaster is required for jump form system.

The surface area of timber formwork is 1769 sq. m. Consider 100 sq. m. of Timber Formwork Hence for 1 sq. m. the cost of formwork is Rs.1,694.20 Cost for 1 sq.m. is Rs.1,694.20 The total surface area is 1,769 sq.m. Hence cost of conventional formwork for 1 floor

= 1,769 X 1,694.20

=Rs.29,97,039.8 Since the no. of repetitions for conventional formwork is 10,

The surface area for Jump form system is 2400 sq. m. Consider 100 sq. m. of Jump form shuttering

Hence for 1 sq. m. the cost of formwork is Rs. 4,913.04 Cost for 1 sq.m. is Rs.4,913.04 The total surface area is 2400 sq.m. Hence cost of conventional formwork for 1 floor = 4,913.04 x 2,400 =Rs.1,17,91,296/- Since the no. of repetitions for Jump formwork is 35. So that after 10 repetitions for Jump formwork is = (10 x 3,36,894.1714) /35

= 96,255.47/-

Total area 150 m2

For 1 day work 1 carpentor + 2 labour = 5 m2 area covered Manpower output = 150/5 =30 days Required days = 30/3 = 10 days Hence for 150 m2 area 3 carpentors and 6 labours complete the work in 10 day

Total area 150 m2

For 1 day work 1 carpentor + 2 labour = 50 m2 area covered Manpower output = 150/50 =3 days Required days = 3/3 = 1days Hence for 150 m2 area 3 carpentors and 6 labours complete the work in 1 day

following points, ■ Since the initial cost of jump form system is more but due to more number of repetitions it is more than 31.13% economical as compare to conventional type. ■ Jump form system is time saving process& it save 10% time than conventional type formwork. ■ Jump form system gives good finishing and aesthetic view. ■ Due to all above factors jump form system is more advisableespecially for high rise construction.

We would like to thank our Principal of institute Prof. Dr. D. D. Shah, HOD Civil Department Prof. Dr. A. W. Dhawale and Asst. Prof. S.M.Barelikar for guidance &Asst. Prof. S.R.Suryawanshifor co-operative guidance, all faculty members and all our dear friends for their support.

Arditi, D., Sikangwan, P., and Tokdemir, O. B. (2002). Scheduling System for High Rise Building Construction. Journal of Construction Management and Economics, 20: pp. 353-364 Arditi, D., Sikangwan, P. & Tokdemir, O.B. (2002). ―Scheduling system for high rise building construction‖, Construction Management and Economics, Vol. 20, No. 4, pp. 353-364. Ketan Shah, (2005). ―Modular formwork for faster, economical and quality Construction‖, Indian Concrete Journal, Vol-79, pg. 6-23. C. S. Poon, Robin C.P. YIP, (2005). ―Comparison of conventional and low waste formwork in Hong Kong‖ World Sustainable Building Conference, Tokyo, 27-29 September 2005, pg. 42-48. Nuzul Azam Haron, Ir. Salihuddin Hassim, Mohd. Razali Abd. Kadir and Mohd Saleh Jaafar, (2005). ―Building Cost Comparison between Conventional and Formwork System: A Case Study of Fourstorey School Buildings in Malaysia‖, American Journal of Applied Sciences, pg. 819-823.

economical and quality construction‖ Indian Concrete Journal, Volume 79, pg. 6-23. Nuzul Azam Haron, SalihuddinHassim (2005). ―Building Cost Comparison between Conventional Formwork System and Industrial Building System‖ Journal Technology (university Technology Malaysia) 43(B) pg. 1-11. Sameer S. Malvankar (2013). ―Factors Affecting The Selection, Economics Involved In Formwork‖ The master builder.

Assistant Professor, JSPM‘s Imperial College of Engineering and Research, Wagholi, Pune