FAQ
This is technique used for construction by using the metal/wooden forms of height appx 1.0 to 1.2m & may be high 2.0m in some case.
The structure is made up of
- Shuttering plates
- Yoke Legs
- Wallers
- Waller clamps
- Head beam
- Jacks
- Jack Rods
- Platform brackets with railing post
- Hanging platform
The Progress of Industry and the development of cities imposes on all building contractors an ever growing task that cannot be carried out unless they adopt the most up to date method of building. One such method is the use of slip-forms. In many RCC constructions, industrial infrastructure or special structures can be built rapidly without the aid of any auxiliary scaffolding. These Structures may be made of concrete, reinforced concrete, pre-stressed concrete as long as the concrete is exposed on one or both faces of the wall.
In Slipform construction technique the entire shuttering arrangement gets lifted upward by means of hydraulic system at the rate of 150mm to 200mm/hrs & you have pour the concrete & bind the reinforcement continuously.
We can achieve the speed of 1.5m to 2m/day in continuous manner.
Those systems which remain intact and move semi-continuously while concrete is being poured are referred to as slip forms. Those which remain in position until the concrete has partially cured and are then moved intact to the next position are called jump forms.
a) Slipform
- We required the speed of construction is more.
- In order to avoid the scaffolding for high rise structures.
- Where jumpform fixing is time consuming at heights.
b) Jumpform
- Structures having lots of corners.
- Not is geometrical shape or odd shapes.
- Slender structures
- Needs form finished concrete
- Useful when you have the jumpform material already manufactured & having reparative type of construction orders.
Slip form construction involves pouring concrete into the top of a continuously moving formwork. As the concrete is poured, the formwork is raised vertically at a speed that allows the concrete to harden before it is free from the formwork at the bottom.
It is widely used in construction projects and is also called the continuously formed or slipform construction method. The well-known method is used for the construction of both vertical and horizontal structures such as dams, roadways, bridges, silos, chimney, jack wells, underground shafts, buildings, and towers.
Slip Forming is an economical, fast, and accurate form of construction Technique that is used for the construction of various types of high-rise structures.
Formwork may be made of wood, metal, plastic, or composite materials: Traditional timber formwork. The formwork is built on site out of timber and plywood or moisture-resistant particleboard. It is easy to produce but time-consuming for larger structures, and the plywood facing has a relatively short lifespan.
Types:-
1) Traditional formwork.
2) Slipform work.
3) Jumpform work (Mechanical & Hydraulic).
4) Tunnel shuttering / Gantry- hydraulics & mechanical.
5) Tunnel Forms.
Timber, Plywood, Steel, Aluminium, Plastics. Magnesium, Fabric & Carbon, fibres.
1. It should be adequately strong to withstand an extensive variety of dead and live loads. For instance, self-weight, weight of reinforcement, weight of wet concrete, loads of workers, and any other loads during and after casting of concrete.
2. It should be inflexibly built and efficiently propped and supported to hold its shape without undue deflection.
3. The joints in the formwork should be tight enough to prevent leakage of cement grout.
4. The formwork should be created in such a way that it may allow the evacuation of different parts in the desired sequence without shaking or damaging the concrete.
5. The material of the formwork should be inexpensive, easily accessible and can be reused for several times.
6. The surface of the formwork should be plain and smooth, and set properly to the desired line and level.
7. The material of the formwork should not bend or get perverted in presence of sun, rain or water at the time of concreting.
8. It should be lightweight.
9. Number reoperation & lift of formwork to be more
> Jamming of The Structure- This is one of the main risks involved in the process of slip-forming in which the shuttering system get stuck with the
concrete for various reasons. Some of the reasons for this are Power failure, Failure of jacks, Improper supervision, Setting of concrete, Uneven pouring of the concrete & Sudden stoppage of the work
> Tilting of the structure
> Twisting or rotation of the structure
> Roughness of the concrete surface
> Deviation dimension
Steel formwork is very durable and can bear heavy loads. Provides a uniform and smooth surface finish. Can be reused many times over. Easy to install and dismantle Steel shuttering plate is the best type of shuttering because this is watertight shuttering which can bear the load of cement concrete placed on it. This shuttering can be used for horizontal, vertical, or any other shape required for the work. It gives a leveled & smooth surface that has a good appearance.
Utilizing slip form formwork in your project will greatly increase the efficiency of your workforce through its automated method of producing vertical castings of concrete. The result is a project completed faster, with the same or improved quality standards as conventional forms, with no reliance on manual labour, thus enabling manufacturers to produce concrete forms at a faster rate than previously possible.
The method used by slip form formworks permits continuous, uninterrupted vertical concrete casting, thereby eliminating the traditional 'start-stop' method of constructing reinforced concrete structures. By doing so, large industrial structures such as silos, chimneys, and core walls can be manufactured 24 hours a day, 7 days a week with faster cycle times and lower dependency on labour while increasing production. Slip form formwork represents one of the most productive construction methods available today and is used to achieve rapid construction of high-rise buildings in the industrial sector.