Here we are doing one semi unitised panel, where I at the beginning I explained a major
project will have unitised panel, semi unitised panels and windows, where unitised panel will
go from factory has fully assembled.
And, the erection at site is like tiling interlocking one after another.
But, in the case of semi unitised suppose the area is not regular, suppose the area
having curvature, suppose the area having less area to cover; we prefer to have semi
unitised, where members of the assembly will go to site prepared for its correctness, fully
cut giving provision for assembly.
And, glass frame will be separately done and bond with the glass and this bonded glasses
will be sent site separately.
So, the site activity will have assembly of mainframes mullions and transoms network attached
to the building with the help of brackets.
And, glass frames carrying the glass bonded from the factory will go and it will mount
to the respective places with the help of hidden fasteners.
Here also the major bonding of the attaching the glass with the frame by structural silicon,
but there will be hidden mechanical fix uh fixings, which will not be expressed at all
outside.
Now, what they are doing is they are doing mullions for this semi unitised assembly.
Ideally, these mullions with carrying connectors this they are doing a connector, where exactly
there horizontal mullion transom will come.
This go separately to the site, they will be attaching this one after another for different
different floors followed by the horizontal transoms which cut and sent to the site.
So, when you see the site activity there will be a framing work where horizontals and verticals
assemble at site on the location of the building and attached to the building elevation with
the help of brackets.
And, proper alignment will be done for its correctness in line and level.
And, even once everything is ready we start moulding the glasses in its respective spaces.
What we are seeing the picture is a connector, where it will receive its horizontal in its
own place . So, the moment we keep the connector exactly
in the location when you cannot do a mistake at site, it will receive the transom there
only.
If you see then for the demo purpose they are doing the assembly of a one particular
panel here namely, 2 mullions and 2-3 transoms.
And, earlier bonded glass will go in its position.
This is nothing, but a semi unitised assembly where we have mullions of around 6 inches
depth and transoms like transoms like earlier I told you, if there is a spandrel panel there
will be additional transom.
If there is an openable panel there is an additional transom, otherwise there will be
transom on top and bottom.
Here all the units are attached together after assembly at site.
So, this transom assembly is continuous, one side of the mullion it will receive the other
side also it will receive and the assembly will be continuous.
But, in the case of unitised it will not be continuous; each panel will be sitting separately
touching each other with the help of gaskets.
So, each panel is allowed to move both way height wise and width wise.
But, here that movement is restricted this connectors and all this assemblies are
done giving a space of 1 millimeter, 2 millimeter.
So, so breathing is done especially in the case of height when it is continuous glazing
is happening after every floor there will be a flexible connection is given.
So, that also in major direction thermal expansion is taken care and each panel is
separately mounded giving space for expansion.
So, glass expansion is also taking taken care, is a mullion here also we have to use lot
of gaskets to avoid contact of the main members with the glass.
And, it will serve as the seals where it will seal the air and water.
We call it as EPDM gaskets, where it has to perform, it is flexible at the same time when
we press each other it will ensure water tightness and air tightness.
And, it will hold the glass flexibly, it will not allow the glass to break, it will give
sufficient space for expansion and contraction.
So, this is a connector receiving the transom, you can see 1440 that is the transom length
cut accordingly, now it is assembly; all assembly facilitated by the design itself, it can take
screw there only.
So, in the design of the system itself all the screws locations are all taken care.
See panel is getting ready, here also there is a connection with connector that connector
is also specially designed.
So, in the semi unitised assembly connectors are playing a major role to assemble the horizontal
and verticals together, this is a part of the system.
Now, the now you see the earlier you see the first unitised panel assembly where I told
you there is an openable panel this is nothing, but that openable panel separately done.
All members assembled together and it is attached at the corners with the process called crimping.
There will be a corner cleat inside that is also a part of the system.
The particular section will have its own corner profile.
So, corner profile is inserted from both side a crimping is done so, that this corner is
attached firmly . So, here there will not be any visible member screws or anything.
So, aesthetically it will be placing.
There is a hidden corner cleat that cleat will have its location for the pressing the
aluminium metal.
So, that when we press at that particular location it will attach together without expressing
any fasteners; all 4 corners we have to crimp it now.
Now, from here we are going to see the assembly of a window, where you can see the profile,
their cutting; unlike in unitised and semi unitised here window demands a mitre cutting
where almost all the corners will be 45 degree.
When we have 45 degree 45 degree assembled together will get 90 degree, usually in window
construction all the corners will be of 90 degree.
So, a 45 degree cutting required here.
It is nothing, but a slider profile where they are doing the work on a outer frame,
where provision for tracks would be there.
There will be 2 or 3 shatters running or sliding on this.
So, it is called a sliding system where it can carry 2 or 3 shatters.
It is for a dual sliding having an additional track for fly mesh.
These after cutting they will prepare the edges for assembly purpose either a cleat
can be used like earlier or hidden screws can be used with the corner cleat.
For that they are preparing the edges and in sliding system, you can see the tracks.
When glass heat on the what the water heat on the glass, it will come to the track and
we have to give escape route for the water.
Here that space is created, if you see the at the edge of the system there is a space
there.
So, there will be a hole to immediately attract the water towards the bottomest chamber and
there will be a drainage hole a slot, you can see he is making a slot a long slot which
will facilitate the water to go out.
So, when we fixed from the fixed the window in the building always the water drainage
you can see on the outside.
The chamber bottom of chamber will take the water and it will drain out.
To avoid the pressure due to wind blowing in the window direction building inside direction
there will be a cap provider for that.
So, when there is then when the wind blowing in the opposite direction this drainage hole
will close automatically.
We do not allow the wind with water coming inside.
You can see the water holes, usually it will be a slotted hole 2 to 3 numbers.
This again this machine is called a copy router, where the required slot will be kept on top.
The system will give the same slot on the aluminium members.
Now, again they are going back to the semi unitised assembly once again.
So, as a part of the program today we had a factory visit, where still factory visit.
Out of that we have covered majorly two things, how a unitised panel assembled and kept ready
to send to the site.
And, there is a semi unitised panel assembly and how this construction have done
will be done at site.
Major difference I told you semi unitised panel will be assembled fully at factory,
glass attached to it by a process called structural bonding and floor to floor panels will be
sent to site.
Site will be doing the erection of this panels floor to floor like tiling, a interlocking
method is used here with the help of floor mounded hidden brackets.
So, after the unitised panel assembly after discrete completion you cannot see any fixing
mechanism from outside or inside, these are all hidden.
This is fast where major areas of the building big facades 1000, 10,000 or 50,000 square
meter of the façade.
Regular facade we always prefer this because, lifting using mechanical means we can have
floor small cranes on top of the building, pulling this panel up to the position and
we can insert by standing inside the building.
So, this particular kind of construction is good for regular building, large areas and
high rise building were scaffolding and other kind of application is difficult, where
it does not demand a scaffolding we can do the work from inside.
Locations are marked for the bracket from inside, panel to panel width is marked and
floor mounded brackets will be fixing then assembly will be happening.
But, in the case of semi unitised where small areas or irregular areas, where building is
having a curvature or having a tapered shape or we have limited areas of the building having
the glazing, we have to go for semi unitised.
This particular one is a semi unitised application where mullions and transoms cut and semi assembled
form will go from the factory.
It will be assembled on the building façade, later glass frames attached to the glass will
go and it will be mounded on the required space.
This kind of application will be little slow, it demands scaffolding from the outside because,
always we have to apply the glass panels from the outside.
We have to push it and we have to fix it in position, but it will be easy for doing one
small area we can do one day, other small area we can do another day.
So, intermittent applications semi unitised should be better and all small buildings and
residential buildings usually this unitised semi unitised will not be serving the purpose
of our functional requirements.
Small window this will be tackled by window system either a sliding window or openable
window or fixed window as per the clients requirement.
So, these three areas we touch together.
Thank you.