Pins in footings..

[ali68]

When setting the pins in a strip footing trench as a guide for the concrete level, is it normal to run them down the centre line of the footing, or zig-zag them either side of the centre line?

Any advantageous/disadvantages?

Thank you.

 

[mikric]

stick em in the middle mate you wont go far wrong . Are you leaving them in or takeing them out after concreteing ?

 

[ali68]

Hoping to leave them in, unless you are about to tell me different

 

[noseall]

they need to roughly line up through the trench centre. this way your tamping board will strike each peg when you tamp, allowing you to finish the concrete with accuracy.

it is at the centre of the trench that the brick/blockwork should be located.

 

[mikric]

Hoping to leave them in, unless you are about to tell me different

just was not sure of your method thats all if the foundations are not to deep i usually knock pins in then mark levels with electrical tape or simillar ,then pull em out when concrete is in, saves time searching for pins to level to ,if you get to much concrete in

 

[Thermo]

i always mark with spray paint either side of the trench wall where they are, just in case that happens

 

[mikric]

i always mark with spray paint either side of the trench wall where they are, just in case that happens

yep also a good tip there Thermo but what about when they have been flattened by driver keen to dump his 6 m2 as fast as possible. lol

 

[noseall]

you should not underestimate the importance of trench pegs.

we use 25mm x 38mm roofing lathe. we normally drive a cold chisel into the ground first allowing the peg to go in deep and stay solid. we rarely lay foundations less than 600mm thick! this requires a minimum 750mm long peg.
these obviously remain buried.

the peg nearest to the concrete lorry shute will take the most stick. this can be stabilized by fixing a diagonal brace to the top of the peg and drive it into the ground further back down the trench, or fix it to the bottom of a neighbouring peg.

always get the driver to wet the mix up a bit.

 

[ali68]

i always mark with spray paint either side of the trench wall where they are, just in case that happens

I've marked the sides of the trenches, thought I was being to fussy, glad I did it now., waiting for BCO to ok the footings before driving in the pins.

Using 20mm rebar spaced at a meter apart, going to have to barrow the concrete in unfortunately, approx 4cu. Depth of concrete is 200mm.

Thanks for your input guys.