a question for those with 2 post car lifts

macafee2 · 26th July 2020, 17:51

How far into the concrete floor do the fixings go, to hold the posts in place?

macafee2

Mickyboy · 26th July 2020, 18:04

When we fitted our new 4 poster ramp I can’t remember how deep the bolts went down but it was deep, the anchor bolts were something like M18 x 180mm however more importantly was the type of concrete, our builder said we needed this type

C40 mix is the strongest we offer and is largely used for industrial projects such as roads, workshop floors and roadworks, support beams, swimming pools and septic tanks.

I’d say it’s even more important with a 2 poster as the weight is distributed across only 2 posts rather than 4

Hope that helps
Mick

macafee2 · 26th July 2020, 18:36

Quote:

Originally Posted by Mickyboy

When we fitted our new 4 poster ramp I can’t remember how deep the bolts went down but it was deep, the anchor bolts were something like M18 x 180mm however more importantly was the type of concrete, our builder said we needed this type

C40 mix is the strongest we offer and is largely used for industrial projects such as roads, workshop floors and roadworks, support beams, swimming pools and septic tanks.

I’d say it’s even more important with a 2 poster as the weight is distributed across only 2 posts rather than 4

Hope that helps
Mick

yes it does, thank you, I never considered the type of concrete.

macafee2

Xavier · 27th July 2020, 13:49

I have just read the Twin Busch instructions and it states a floor base of 200mm minimum and the bolt lengths are 160mm. Hope this helps

macafee2 · 27th July 2020, 14:39

Quote:

Originally Posted by Xavier

I have just read the Twin Busch instructions and it states a floor base of 200mm minimum and the bolt lengths are 160mm. Hope this helps

yes it does, appreciate you letting me know, thank you
Does it by any chance advise on what the bolts must go into?

macafee2

macafee2 · 27th July 2020, 15:39

concrete base needs to be C30/37 if area could get frost or c20/25 if no frost and 8 inches depth is required for the bolts. I'll suspect frost

The costs is going up but f the chance comes

macafee2

COLVERT · 27th July 2020, 20:23

I have personally fixed hundreds of holding down bolts on various building sites.

Drilling is OK. ( sort of. )--( Casting in is the correct way. )

You need to know the fixing hole centres.

Use a timber cross piece with a square of 1/2 ply at each end.

Drill holes in the ply at the fixing hole centres. Put the bolts head down through the hole after fitting a square steel plate on each bolt against the head. To stop the bolts falling out put the nuts on the thread sticking out at the top. Make sure you have enough thread for fixing down the pillars when you come to it.
You will, no doubt, be placing steel mesh in your concrete floor slab. Fix your timber cross piece, with the bolts where you want them, to the reinforcement steel.
Carefully pour the concrete.---

----to the correct level.

Use short steel pins driven into the ground with the top of the pins at finished concrete level.

The concrete will take a week to achieve half strength.

A month to achieve full strength.

Don't load up the bolts too soon. ( Minimum a week after pouring the slab. )

COLVERT · 27th July 2020, 20:30

A little bit more to the above post.

If you need a bit of movement on the concreted in bolts you can buy polystyrene cones to fit on the bolts before concreting. The cones are removed by pouring a small quantity of petrol on them and they will dissolve down to nothing, leaving a space around the bolt shank allowing it to move in any direction.

Happy concreting.---

You can buy the square steel plates mentioned in the above post at the same builders merchants you can buy the cones from, also the steel bolts.

COLVERT · 27th July 2020, 20:38

PPS.--

Don't be tempted to use Rawlplug expanding bolts.

In this type of critical work ( supporting a car in the air)

The concrete must not be stressed !!!!!

75driver · 27th July 2020, 21:00

Quote:

Originally Posted by COLVERT

PPS.--

Don't be tempted to use Rawlplug expanding bolts.

In this type of critical work ( supporting a car in the air)

The concrete must not be stressed !!!!!

Do you know if chemical anchor bolts are suitable for a lift installation?

Sent from my iPhone using Tapatalk

26th July 2020, 17:51	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,926 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	a question for those with 2 post car lifts How far into the concrete floor do the fixings go, to hold the posts in place? macafee2

26th July 2020, 18:04	#2
Mickyboy SERVICING AND DEALER DIAGNOSTICS MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	When we fitted our new 4 poster ramp I can’t remember how deep the bolts went down but it was deep, the anchor bolts were something like M18 x 180mm however more importantly was the type of concrete, our builder said we needed this type C40 mix is the strongest we offer and is largely used for industrial projects such as roads, workshop floors and roadworks, support beams, swimming pools and septic tanks. I’d say it’s even more important with a 2 poster as the weight is distributed across only 2 posts rather than 4 Hope that helps Mick __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE] Last edited by Mickyboy; 26th July 2020 at 18:14..

27th July 2020, 20:23	#7
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	I have personally fixed hundreds of holding down bolts on various building sites. Drilling is OK. ( sort of. )--( Casting in is the correct way. ) You need to know the fixing hole centres. Use a timber cross piece with a square of 1/2 ply at each end. Drill holes in the ply at the fixing hole centres. Put the bolts head down through the hole after fitting a square steel plate on each bolt against the head. To stop the bolts falling out put the nuts on the thread sticking out at the top. Make sure you have enough thread for fixing down the pillars when you come to it. You will, no doubt, be placing steel mesh in your concrete floor slab. Fix your timber cross piece, with the bolts where you want them, to the reinforcement steel. Carefully pour the concrete.-------to the correct level. Use short steel pins driven into the ground with the top of the pins at finished concrete level. The concrete will take a week to achieve half strength. A month to achieve full strength. Don't load up the bolts too soon. ( Minimum a week after pouring the slab. ) Last edited by COLVERT; 27th July 2020 at 20:31..

27th July 2020, 20:30	#8
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	A little bit more to the above post. If you need a bit of movement on the concreted in bolts you can buy polystyrene cones to fit on the bolts before concreting. The cones are removed by pouring a small quantity of petrol on them and they will dissolve down to nothing, leaving a space around the bolt shank allowing it to move in any direction. Happy concreting.--- You can buy the square steel plates mentioned in the above post at the same builders merchants you can buy the cones from, also the steel bolts. Last edited by COLVERT; 27th July 2020 at 20:34..

27th July 2020, 13:49	#4
Xavier Avid contributor MG ZT 260 SE Join Date: May 2014 Location: Weardale Posts: 133 Thanks: 89 Thanked 21 Times in 20 Posts	I have just read the Twin Busch instructions and it states a floor base of 200mm minimum and the bolt lengths are 160mm. Hope this helps

27th July 2020, 15:39	#6
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,926 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	concrete base needs to be C30/37 if area could get frost or c20/25 if no frost and 8 inches depth is required for the bolts. I'll suspect frost The costs is going up but f the chance comes macafee2

27th July 2020, 20:38	#9
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	PPS.-- Don't be tempted to use Rawlplug expanding bolts. In this type of critical work ( supporting a car in the air) The concrete must not be stressed !!!!!