PFM-Stone & Building Art

Q
Progress of PFM in curved/arched staircase technology
A
About the Staircase Design
1.Straight stairs
2.Arched/Curved stairs
3.Circular stairs
4.Spiral stairs
5.Quarter turn stairs
6.Half turn stairs
7.Winder stairs
1.Straight stairs
These are the stairs along which there is no change in direction on any flight between two successive floors.

According to general rules the amount of treads in one straight flight shall not exceed 16. Despite their simple forms pertinent components may communicate a unique style to the stair case.

The most simple in terms of design, manufacture and installation is the staircase with straight flight.
2.Arched/Curved stairs
Curved stairs, like spiral stairs are helical how ever, they tend to be on a much larger radius and typically do not make a full circle. The treads in such stairs are wedge-shaped as well, but tapering at one side is not very vital as that at Winder Stairs.

They are elegant and graceful in appearance, and with pertinent components the staircase looks very effective. For this reason they are almost always located at the entry where it makes the best first impression.

They are very difficult-to-make because all basic details, closed strings and (or)open strings.as well as handrails are curved.
3.Circular stairs



These stairs, when viewed from above, appear to follow circle with a single center of curvature and large radius. Circular staircases have a gap down the middle: these typically have two handrails.

These stairs are generally provided at the rear of a building to give access for servicing at various floors.

All the steps radiate from a newel post in the form of winders. These stairs can be constructed in stone, cast iron or R.C.C.
4.Spiral stairs




These stairs are similar to circular stairs except that the radius of curvature is small and the stairs may be supported by a center post constituting the backup abutment for all treads in the flight. Overall diameter of such stairs may range from 1 to 2.5m.

Here just like in winder stairs and arched stairs the treads are wedge-shaped, but all of them(except for the last one)are uniform-sized.
5.Quarter turn stairs


Quarter Landing Stairs represent a variety of straight stairs, which also include a landing. But here the landing is needed to change a direction of the flight by 90 degrees and at the same time it serves as a place for rest when moving. The landing may change its position in the flight from its beginning and up to its end.

Staircases of this type are more convenient and safe than straight staircases. Due to the presence of the landing the flight is divided into two. thereby reducing quantity of treads in one flight, and makes walking more comfortable.

6.Half turn stairs


Quarter Landing Stairs represent a variety of straight stairs, which also include a landing. But here the landing is needed to change a direction of the flight by 90 degrees and at the same time it serves as a place for rest when moving. The landing may change its position in the flight from its beginning and up to its end.

Staircases of this type are more convenient and safe than straight staircases. Due to the presence of the landing the flight is divided into two. thereby reducing quantity of treads in one flight, and makes walking more comfortable.
7.Winder stairs
Winder Stairs are the stairs with a turn by 90 and 180 degrees, but in contradistinction to Quarter Landing Stairs and Half Landing Stairs on turn the wedge-shaped treads are used for their construction.

It is no need to construct an intermediate landing, and also to reduce the space occupied by  the staircase.

In terms of design, staircases of this type possess soft and flowing lines, which under-line their beauty, of course. And such staircase looks evidently intriguing, as if inviting to go up the radial stairs.
PFM Project about Curved/Arched stairs
A well-designed curved staircase offers much more than its functional purpose. In fact, a staircase is an integral facet of design, a focal point, and often the first piece of furniture seen by visitors. Beautiful and complex, curved stairs are considered the pinnacle of stair craftsmanship, and our team of talented professionals.

The technical difficulty of the stone curved/ arched staircase is indeed the process of the cover plate, base plate and handrail which neither the software nor the experienced master can make it accurately. The maximum they can do is to draw the length of the inner/outer arc as well as the altitude. Before processing, it still need to be adjusted ceaselessly according to the computer wire cut machine and rotary platform machine.
Step 1:Measurement data on site
Step 2:Plan and 3D Design Based on Requirement
Plan
Bird's-eye view
Elevation
Side view
Step 3:Details split CAD
Step 4: Pre construction frame
Step 5:Manufacturing technique
About PFM
PFM is one of the most successful, rapidly expanding construction organizations in our region. Our aim is to continue to grow by taking on projects that more than demonstrate what we’re capable of, surpass expectations and continue to enhance the lives of our people.

Our success is built on fostering strong, long-term relationships with clients and suppliers. 
These relationships are based on trust, respect and transparent, ethical working practices. Our clients’ faith in us inspires us to complete projects on time, and on budget.
To achieve our goals, we will continue to innovate, embracing leading-edge technology and constantly monitoring and enhancing the way we work.

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