FPC Aug 6, 2022:

More Navigating fasteners can be confusing as even dedicated websites don't always use terms consistently. The concept is there anyway and unless one has a picture and a shared glossary for a specific applicatio / client, the process can turn to splitting hairs without even reaching a conclusion

https://sudfixation.com/fr/15-fixation-visserie-boulonnerie-...

https://sudfixation.com/fr/15-fixation-visserie-boulonnerie-...

https://www.doityourself.com/stry/lag-bolts-vs-carriage-bolt...

FPC Aug 6, 2022:

Look Not much difference , if any

https://www.doityourself.com/stry/selecting-and-using-concre...

https://civiconcepts.com/blog/types-of-concrete-anchors#What...

Maria Hansford (asker) Aug 5, 2022:

@Althea Draper There is no reference to wood in the text - living in North America, I automatically thought of wood, commonly used in construction here. However, this is a large public building. So, it is reasonable to assume that these metal structures are to be connected to concrete elements:
"Anchor bolts are used to connect structural and non-structural elements to concrete"

Althea Draper Aug 5, 2022:

I found this parking post on Leroy Merlin's site. It states, "Il se fixe facilement au sol avec 2 boulons à bûche.".
https://www.leroymerlin.fr/produits/quincaillerie/quincaille...
When you look at the manufacturer's website and scroll along the photos, you can see a drawing of the kit contents and in another photo you can see a description of the device in various languages. In the French version, what was called 'boulons à bûche' in the Leroy site are called "deux tiges d'ancrage" and are called "2 anchor rods" in English.
https://ducatihome.it/products/my-park-2110
There is a video showing how these are fitted see https://www.youtube.com/watch?v=J_1rJgSSikE from 2mins 54secs onwards.

Since the source talks of a steel structure (rather than wood) with base plates, could it be talking about anchor rods/bolts or if it is a lag screw then would it need a lag shield anchor?

FPC Aug 5, 2022:

@ Maria The document linked in my comment to Samuel has a picture in a parts list: you can see it quite clearly

Maria Hansford (asker) Aug 5, 2022:

@Samuel I think you are right, this is a five-floor building.
"lag bolts are special bolts used to secure heavy-weight projects. This includes things like roof beams, garage pillars, and other major building projects."

Bashiqa Aug 5, 2022:

@ Tony Thanks, coach bolt had escaped my frazzled brain. Have to admit that hot weather does not suit me as well as it did like 40 years ago.

Tony M Aug 5, 2022:

@ Bashiqa I think what you are describing is a 'coach bolt' — but I believe Samuël has the right answer with 'lag bolt' etc.

FPC Aug 5, 2022:

@Samuel I think you're correct. It's a "lag screw / bolt". Post your answer

https://fr.manuals.plus/manteau-de-cheminée/manuel-du-suppor...

Samuël Buysschaert Aug 5, 2022:

Fwiw If i'm not mistaken, boulons à bûches makes me think of a type of anchor bolt.
https://en.wikipedia.org/wiki/Anchor_bolt

Also can be a type of "tire-fond" so lag screw/bolt
https://provenproductivity.com/lag-screws-use/
https://bricoleurpro.ouest-france.fr/dossier-181-tirefond.ht...

depending if wood is involved for the fixation of the structure in your context.

Bashiqa Aug 5, 2022:

I suspect these are bolts with square section underneath the head that is pulled into the timber to prevent turning while tightening. Specific name escapes me at present.