threaded bars on stone wall

[ragnol]

Hello, everyone.

in a niche of discreet size (150xh300cm) will be mounted a wooden panel (artwork) of the weight of about 2.00kn. the panel discharges the weight to the foot, being leaned.

to avoid tipping out (a dumb teenager trying to pull, wind depression etc. :d) will be put 4 brackets (two in low to 80 cm from the foot, two at the top) fixed to the bottom wall using resin ø16 thread bars.

the parade consists of masonry - healthy - in plastered stone, then at the moment of fixing (the position of the anchors is obliged) you can not know if you will drill a stone conical or only the mortar of amorsation.

the various tables (e.g. fischer) give as a minimum seal value ammissibi traction on perforated bricks (the worst support among the tabled ones) for a ø16mm bar about 1.00kn.

you have specific values for stone walls with some table in support (I imagine the question: which stone, how, etc.)? would you use, as I think I do, the values related to perforated bricks and so much greetings?

the body that commissioned the work asks for a handkerchief with indications on the assembly/disassembly procedure and two calculations on the cross on the fixing.. .

 

[Cristallo]

to feel, I think it is easier than fixing tears the wooden panel and fixing by means of resin bar.
Then who said that the fixtures must be 4?
You could (for example) make a homogen bracket with 2 chemical fixtures, spaced in such a way that regardless of positioning 1 strong fixing in the brick, on which the wooden plate is fixed with 1 bolt only. . .
For example, if you know that the block of the brick has a mesh of 8x25, make an omega bracket with holes distant 20cm and the 45° stake respects to the vertical (if even 1 hole catches the mortar the other must happen for forces in a brick).
In short, create an interface that can guarantee you on uncertainty, then it will be masked by the panel itself.
not so much for the kid trying to pull (400 kg of shooting for a person I see it hard), but for the wind, probably with 4 kn on a surface of 4,50mq you wouldn't do it anyway. . .
better some extra fixing and especially eye to fixing on wood.
it would be antipatic to find the fixtures correctly anchored to the wall and the panel with 4 holes, printed on the facade of the building in front.
this always if you respect the conditions you specified, that on the fixings does not weigh the proper weight of the panel, that resting on the ground becomes self-supporting.

 

[ragnol]

hi crystal, thanks for the intervention, but as I specified in the opening message the wall is stone plastered, so I can't know if and where the stones are (it is a building of the 1920s).
for this I thought of using the minimum value I find and stop, at least that uqalcuno does not have higher values.

fixing (type, number and position) are established by the client in concert with the artist (which is not me....magari).

the problem of the wood panel does not arise because the bars are solid to artistic "zampine" that block the wood panel.

Thanks anyway

 

[Cristallo]

So, to sum up, you're telling me that the client:
not from information on support (dimensional and material);
decided the number and size of the fixtures, including their arrangement;
decided the type and size of the interface between fixing and panel;
wants from you calculations (and responsibility) on everything (which she decided and of which she does not know the characteristics).

all (presummary) without making any inquiry (a bit chiselling, a test fixation with a parade test... Nothing)

What to say.. Good luck!

 

[ragnol]

no crystal, nothing so LeoninoDon't worry.

I'm not broken, I won't need luck.

Thank you

 

[Legs]

you have specific values for stone walls with some table in support (I imagine the question: which stone, how, etc.)? would you use, as I think I do, the values related to perforated bricks and so much greetings?

as good the seal of a bar in a stone is not possible in any way to guarantee the seal of the masonry as a whole.
substantially in addition to the anchorage seal you should also ensure the seal of the "wall panel". I know that the forces at stake are modest but who knows how that wall is made.
so that a wall can resist horizontal loads perpendicular to its plane must foresee (as a necessary condition but it is not said that it is sufficient) an axial load (the unloading of a loft so much to say). the fixtures will then be made bypassing with appropriate counter-plants to make the wall panel work.
Another possibility is to create a metal frame and fix everything on the ground.