Bolts stopping walls spreading on old properties

1. I was told in my school physics lessons that walls could be pulled back by heating the rod inside the building, tightning the plates and then letting the rod contract as it cooled.

tie rods/wall ties

yes, on older porperties.

they could be to an extent pulled back, but mainly it was to stop them falling apart further, generally after someone cut through something structural, or it rotted away...or they built something on top...

Doing physics must have been very complicated on your planet with two number 3's.

:o)

you just have threaded ends and torque them up.

if the wall has bowed, it's because it is not very stiff to start with.

Huge wrote in news: snipped-for-privacy@mid.individual.net:

The second 3 was a response to first 3.

Well it used to occur on end of terrace buildings where the original adjoining end was bombed during the war. they made a new end wall and seemingly put some bolts through to something structural to keep it from falling over. Much better than a bit of old timber angled and wedged up against the remaining wall! I was born in 1950, and could still see these when I was old enought to remember.

Some of the prefabs were bolted together as well, which I always thought was quite amusing. Brian

Around here it was often precautionary, due to mining, and done by or on behalf of the colliery. Known as "rodding at the chamber joist", apparently (i.e: in the floor void of the 1st floor.

I've certainly heard that explanation too, it always seemed a bit suspicious to me given that they often run between first floor joists.

Changing the subject, I went to a splendid lecture in the late 70's by a guy from the Fasteners division of GKN who had been involved in designing and fitting the rods through the tower at York Minster.

He said the "spec" was described thus:

corrosion resistant................OK each fastener to take x tons.......OK able to pass through 2 inch hole...OK

They are made from standard lengths of 1 inch stainless studding which IIRC are about 20 feet long, connected by simple threaded couplers.

Known as "rodding at the chamber joist",

Now there's a euphemism if ever there was one.

Once upon a time there was a tie beam at first floor knee level in the wall separating the two peasant's hovels.

When they were joined and a door cut in the wall something was needed to absorb the outwards thrust from the roof joists. I've seen some where the door cill is at knee level still.

Andy

En el artículo , newshound escribió:

Why suspicious? If wall spreading was severe enough, the joists could pop out of their mounts, leading to floor collapse. Tying prevents this. Have I missed something?

En el artículo , DerbyBorn escribió:

Tying, or tie-ing.

in extreme cases, the rod was heated then the nuts done up. as the rod cooled, the walls were pulled in.

Tie plate spotting is a thing - some of the designs are quite attractive.

A friend once lived in an old end terrace which had a couple of ties, with the traditional external "X", fitted. I was surprised to find, when lifting an upstairs floorboard, that the inboard end of each was a thin strap (no more than 3 mm) set on top of the joist, which had been cut away to take it, and secured with a couple of no 8 woodscrews.

Chris

How do you heat up a rod sufficiently when it's between floors/joists without setting the building on fire? That's the bit that seems a bit unlikely.

Tim

En el artículo , Tim+ escribió:

Dunno. Maybe it was only done in locations where the tie bar is in free air, such as churches, etc.

This patent for heating tie bars is interesting.

it describes using AC electricity at heavy currents to heat the tie bar. Might have been a bit tricky in the sixteenth century, though.

I have also seen tie roads with a tightning device in the middle. Presumably for situations like this.

Mike Tomlinson wrote in news: snipped-for-privacy@jasper.org.uk:

Thanks - fascinating.

Wouldn't that set fire to the joists/flooring? Or at least put them in danger.

Exactly.