Dome: Difference between revisions

Latest revision as of 15:25, 17 February 2026

There are two domes, one in the UK and one in the EU. Both domes are the same spec and have a radius of 4.75m. One is in Weeze_Storage and the second one is in UK Storage (unclear where - ask EMF people).

Problems

EMF 2024

A new tarp can be ruined after several strong gusts of wind. We need ground ankers and 200m of high tensile rope for each dome to prevent this from happening again + improved plans on setting up the dome and adding a tarp so it's clear for newbies.

WHY 2025

Multiple screws (4-5?) could not be removed during teardown and had to be cut with an angle grinder, it felt like it was more than normally.

The dome was anchored with relatively small rebar anchors in the fears that it will fly away. There is no possible scenario in which the dome will fly off in strong winds. If that were to happen we will likely be dead by then. To prevent this the anchors needed would be those 50-100cm massive pegs for big festival tents, not the tiny things that were used. Adding those tiny anchors just makes teardown more difficult and serves no practical purpose. I'm not running any simulations to prove that I'm right but I also suspect that there is no data to prove that anchors are needed.

The tarp was rubbing on a joint and developed a hole, this was fixed with duct tape.

Buildup

Diagram

Struts

The dome is built out of struts.

Amount	Color	Length	Notes
35	Blue	about 3 meters	"The long ones"
30	Red	about 2.66 meters	"The short ones"

There is also a box with bolts and required tools which is likely to be stored next to the struts as well as a tarp used to cover the dome.

Tools

17 wrench, 17 ratchet with extra long nut driver.

Bolts

Preference;

EN 15048 DIN 933 bolts in M10x150
Matching nuts and washers

EN 15048 is for "Non preloaded structural bolting"
DIN 933 determines the bolt has a full thread

These bolts are a good high strength steel meant for steel construction that doesn't move/shift/vibrate much. Basically tensile or shearing forces only.

Emergency use only:

Materials:
- (ungraded or unknown) Zinc Galvanized Steel
- (ungraded or unknown) Stainless Steel

These materials can and will suffer from Galling or cold weld when the dome is built. You will need an anglegrinder or saw to remove these bolts after use.

Bolt types:
- DIN 931

This bolt type has a partial thread, meaning the dome struts cannot be properly fastened

Tarp

@TODO

Benches

Wood

Measurements.pdf

Screws

Woodscrews 4.5mm diameter 4.5cm long.

like http://i.ebayimg.com/thumbs/images/m/mDJf7KpPBwFp1AFym1DO9kQ/s-l225.jpg

@@ Line 2: / Line 2: @@
 File:dome.jpg
 File:dome_night.jpg
+File:EMF24_Sunrise_Dome.jpg
+File:Dome being built up at why 2025.jpg
 </gallery>
-The radius is 4.75m. Both domes (UK and EU) are the same spec. One is in [[Weeze_Storage]] and the second one is in UK Storage (unclear where - ask EMF people).
+There are two domes, one in the UK and one in the EU. Both domes are the same spec and have a radius of 4.75m. One is in [[Weeze_Storage]] and the second one is in UK Storage (unclear where - ask EMF people).
 == Problems ==
@@ Line 11: / Line 13: @@
 A new tarp can be ruined after several strong gusts of wind.
 We need ground ankers and 200m of high tensile rope for each dome to prevent this from happening again + improved plans on setting up the dome and adding a tarp so it's clear for newbies.
+=== WHY 2025 ===
+Multiple screws (4-5?) could not be removed during teardown and had to be cut with an angle grinder, it felt like it was more than normally.
+The dome was anchored with relatively small rebar anchors in the fears that it will fly away. There is no possible scenario in which the dome will fly off in strong winds. If that were to happen we will likely be dead by then. To prevent this the anchors needed would be those 50-100cm massive pegs for big festival tents, not the tiny things that were used. Adding those tiny anchors just makes teardown more difficult and serves no practical purpose. I'm not running any simulations to prove that I'm right but I also suspect that there is no data to prove that anchors are needed.
+The tarp was rubbing on a joint and developed a hole, this was fixed with duct tape.
 == Buildup ==
@@ Line 16: / Line 26: @@
 === Diagram ===
 [[File:Dome diagram.gif]]
+=== Struts ===
+The dome is built out of struts.
+{| class="wikitable" style="margin:auto"
+|-
+! Amount !! Color !! Length !! Notes
+|-
+| 35 || Blue || about 3 meters || "The long ones"
+|-
+| 30 || Red || about 2.66 meters || "The short ones"
+|-
+|}
+There is also a box with bolts and required tools which is likely to be stored next to the struts as well as a tarp used to cover the dome.
 === Tools ===
-Needed: 17 wrench, 17 ratchet with extra long nut driver.
-=== Screws ===
+wrench, 17 ratchet with extra long nut driver.
-nuts and bolts M10
+=== Bolts ===
+Preference;
+* [https://www.nen.nl/en/nen-en-15048-1-2016-en-222710 EN 15048] DIN 933 bolts in M10x150
+* Matching nuts and washers
+EN 15048 is for "Non preloaded structural bolting" <br />
+DIN 933 determines the bolt has a full thread
+These bolts are a good high strength steel meant for steel construction that doesn't move/shift/vibrate much. Basically tensile or shearing forces only.
+Emergency use only:
+* Materials:
+** (ungraded or unknown) Zinc Galvanized Steel
+** (ungraded or unknown) Stainless Steel
+These materials can and will suffer from [https://en.wikipedia.org/wiki/Galling Galling] or [https://en.wikipedia.org/wiki/Cold_welding cold weld] when the dome is built. You will need an anglegrinder or saw to remove these bolts after use.
+* Bolt types:
+** DIN 931
-M10 ring nut to hang things
+This bolt type has a partial thread, meaning the dome struts cannot be properly fastened
-like https://www.bauhaus.info/ringmuttern/stabilit-ringmutter/p/10800114
 == Tarp ==