Hi folks, new guy alert 
I'm doing some AutoCAD work at the moment and have been asked to find details of a supplier of... well that's the problem - what do you call these trolley-like devices that can be fastened to a steel pipe so that it can be fed through the length of a concrete sleeved tunnel?
I've already drawn one of the devices to the required spec, in longitudinal view (looking down the pipe's length), it resembles a clamp with fingers arrayed around the pipe circumferance to keep it aligned centre-bottom of the sleeve, insulated from the concrete. However, there is also a clamp with three jockey wheels bolted to the bottom, to transport the pipe along the sleeved tunnel as it is welded, I have searched the internet trying to find a supplier, but I think there must be a particular name for this device, as my searches have proved unsuccessful.
Would anybody be able to help me by identifying this device, or giving me a selection of names for it that I can search for a supplier with?
It's frustrating that I've drawn this device a number of times to different specs but never known it's proper name!
I'm doing some AutoCAD work at the moment and have been asked to find details of a supplier of... well that's the problem - what do you call these trolley-like devices that can be fastened to a steel pipe so that it can be fed through the length of a concrete sleeved tunnel?
I've already drawn one of the devices to the required spec, in longitudinal view (looking down the pipe's length), it resembles a clamp with fingers arrayed around the pipe circumferance to keep it aligned centre-bottom of the sleeve, insulated from the concrete. However, there is also a clamp with three jockey wheels bolted to the bottom, to transport the pipe along the sleeved tunnel as it is welded, I have searched the internet trying to find a supplier, but I think there must be a particular name for this device, as my searches have proved unsuccessful.
Would anybody be able to help me by identifying this device, or giving me a selection of names for it that I can search for a supplier with?
It's frustrating that I've drawn this device a number of times to different specs but never known it's proper name!
