Everything you need to know about Slip Formwork?
TweetSlip Framework: Definition
A dynamic or moving framework structure is used in the current technique of casting concrete known as slip formwork or slip form. Using this technique, concrete is poured as the formwork is raised slowly. Only when the desired casting length is reached does the procedure come to an end.
In order to prevent the forms from being lifted too quickly, the slip form method requires constant monitoring of the concrete pouring and setting pace. This cutting-edge method also depends on the concrete's quick setting and cooling characteristics.
In unusual structures such as cooling towers, chimneys, silos, roadways, and bridges, slip formwork is the best technique to accomplish fast and rapid construction
There are some structures that do not work well with slip forming. In structures with a height greater than 16 meters, slip formwork techniques are used.
Slip construction methods are completely dependent on mechanization. The quickest erection process in the building sector, it takes into account around 7.2 m per day. Since it is a highly quick and time-saving erection technique and requires less manpower overall, it is also cost-effective.
Elements of the Slip Formwork
Vertical Formation
Metal, wood staves, plywood, glass-fibre reinforced plastic, or a mix of these materials are used to create vertical formations. Vertical forms are mostly used to shape concrete.
Yokes
Structures are supported by yoke legs that lift and hold weight. By transmitting the lifting forces safely, it ensures the integrity of the jacks and the walls. Supporting platforms, scaffolding, and beams can also be connected with yoke legs.
Wales
There are a number of ways in which Wales can be used to hold vertical forms in place. In addition to this, it can also be used to support scaffoldings and other platforms.
Varieties of Slip Formwork
Following is a discussion of the different types of slip formwork that can be used.
Horizontal Slip Formwork
Walls for traffic separation and pavement are constructed using horizontal slip forms. Using this technique, concrete is spread out, worked on, and settled in place while the shape progressively advances.
Vertical Slip Formwork
In the production of concrete, the vertical slip forming method makes use of the extrusion idea. Between the initial strength growth and the capacity to operate, the concrete's rapid setting qualities must be present.
In order to lift the concrete form and working platform simultaneously in a continuous vertical sliding action, hydraulic jacks are used throughout the concreting process.
Egg Shaped Slip Form System
The leap from the idea, on which this method is built, can be applied to any geometric shape. The axis and vertical circumferential slope adjustments can be used to change individual curvature. It has goods that are in the best possible functioning condition and may be individually adjusted on either side of the wall.
Canonical Slip formwork
By using Canonical Slipforming, decreasing layouts and increasing layouts can be constructed monolithically without any steps. Formwork structures that can be moved horizontally are used for slip-forming variable cross-sections. Hydraulic elements adjust the tapering of these elements.
The above girder star's centrepiece, which joins all of the major beams to a consistent, closed scaffolding, serves as the tower's focal point. It also functions as an upper work platform at the same time.
The conical slip-forming technique was created to build buildings with continually varying wall thicknesses and dimensions.
Merits of Slip Formwork
The merits/advantages of Slip formwork are as follows:
- Concrete is being poured non-stop. A fourfold increase in speed.
- A high rate of production
- Safe working conditions are provided for workers.
- A reduction in labour costs.
- Enhances workspace availability.
- Cranes are not required when using the slip form technique.
- It is possible to obtain uniform wall sections and layouts.
- It is more than just regular work that makes you strong and accurate.
- Reduces the number of formwork materials used.
- There is no need for plastering.
- Concrete finishing should be improved.
- It is not necessary to construct scaffolding.
- The structure does not require joints.
Demerits of Slip from Construction
The demerits of using slip from in construction are as follows:
- There is a very high cost associated with the initial investment.
- Arranging various components is a time-consuming process
- The operation and supervision of this process require expert knowledge.
- Materials cannot be easily stocked on site.
- Organizing the site and coordinating well is essential.
- Regardless of the weather, the work must be continued or otherwise, it will cause more problems.
- Equipment such as generators, lighting systems, and hoists are required in large quantities.
Safety measurements and features
- Working platforms should be included in the system along with platforms, ladders, guard rails, and windshields.
- Despite its fragility, the formwork system is sturdy once completed.
- It is possible for workers to become familiar with health and safety issues quickly.
- There should be no formwork or jack jams, and all sections should move uniformly.
- Supports must be provided on the sides of the forms.
