SLIP FORMING
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SLIP FORMING.
INTRODUCTION:-

Civil engineering course put more attention to concrete and reinforcement while almost ignoring the major component like formwork. No attention is paid to economic design of formwork. Formwork costs approximately 10% of the total cost of the construction projects but at the same time sheltering/scaffolding involves major capital investment.
The construction industry today lacks Engineers who can design a good formwork system. There are enough Engineers to do concreting, reinforcement and a structural design but there are not many to improve upon the formwork.The procedures so far has been mainly hit and trial at least for the smaller construction companies. In spite of being such a major capital cost component, no enough research has been done to minimize the cost of formwork.
Ever since man began to building structures he has to cope up with technical limitation, practical problems limit the height of sky crapper and lengths of bridge. To constantly challenge the limits of what we can achieve, new techniques are created and discovered by people in all fields of construction.
The increasing shortage off skilled carpenters, the cost of timber and economic disadvantages of economic disadvantages of traditional purpose built forms have made the use of SLIP FORMING is necessary. So that revolutionary technique called SLIP FORMIG is in introduced.
Slip forming is technique of construction using mechanized formwork. Slip forming is process of continuous lifting of formwork by a hydraulic system of jacks and pumps
A technique that was first used in America in 1910 gained prominence and technical advance in Europe in 1960. The earlier systems were manually operated and cumbersome. But as time passed it has gained new dimensions. This slip forming technique the unprecedented synthesis of maximum output and minimum input.
In India since, 1982 SLIPCO CONCTRUCTION (P) LTD LARSEN AND TURBO has been pioneers in this field. For LARSEN AND TURBO “NO STRUCTURE IS COMPLICATED BY SLIP FORMING.
Also one example of ASHOKA GROUP who had constructed a bridge near Pandharpur in 38 days was record .it was just possible due to technique of SLIP FORMING.
What is sliding formwork?
On the basis of construction drawings, we plan the performance of sliding formwork with drawings and slide profiles for openings and embedded items. The moulds, which are 1.1 metres high, are made of wood covered with a 1 mm steel sheet. According to the load and design in question, we fit lifting yokes and hydraulic jacks. The jacks are fitted to scaffolding that is gradually moved as the slide progresses. Lasers are used for vertical checking, while spirit levels are used for horizontal checks. The work platform itself is fitted to beams with a hanging platform mounted below. During operation, all the jacks are controlled by a central unit. Each lift normally raises the slide 20-25 mm. Casting and reinforcement work is normally performed continuously as the sliding formwork works its way up. The intended hardening front is approximately 90 cm, which means that this is located around 20 cm from the bottom edge of the mould. The setting time is regulated by additives (acceleration/retardation) so that it matches the progress of the mould.
The normal slide rate is 2.5-3.5 metres per day, but depending on the construction project, we can produce 7-8 metres per day
Preconditions
As for all projects, success depends on good planning. Choosing to use sliding formwork for construction early in the planning process means that the project can be prepared for this technique. Important parameters such as concrete quality must be checked. Unintended variations in the concrete quality must be avoided, and efficient, accurate control of the concrete setting time is particularly important. Moreover, reinforcement should be standardised with as few posts as possible, and particular attention must be paid to the distance between the reinforcement bars, bar length and the shape of angles and bows. If required, tensioning cables are fitted simultaneously with the other work, so stringent requirements apply to pre-positioning and preparation. Openings and embedded items must also be adapted to the sliding casting method, as such items must not extend beyond the wall surface of the construction. Normally, such items need to be 15-20 mm thinner than the wall(s) in question. Sliding profiles with the correct contour height and position need to be prepared.
It is just as important to recognise that a sliding operation is a team effort, where the slide is in continuous motion, and where parties other than Interform are involved in casting, reinforcement, positioning of openings, cleaning etc
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