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Ground Conditions

Assuming that you don't want your marquee to blow away you will need to anchor it to the ground. The most common way of doing this is to use steel pegs (some times called stakes or pins these are normally steel rods, for most small marquees around 25mm x 1000mm).

These will only resist pull out if they are used correctly. For example if the pegs are used on sand they will be almost useless.

Traditional Marquees

These marquees will need special consideration as the pegs form part of the marquees integral structure. Depending on the site / time of year and ground conditions it is normal to "double up" on corners and seams.

This means that each corner of the marquee has two or more guy ropes and pegs. This both improves pre tension (the force applied to the roof before wind or snow loading). You can almost not have enough pre tension on a marquee as this will reduce the amount of flapping that occurs. Less flapping will reduce the shock loading a peg will receive, reducing the chance of exceeding the pegs capacity.

The pegs should be angled away from the marquee when driven into the ground and the guy attached as low to the ground as possible (this increases resistance to pull out).

Careful consideration should be given to the exact location of the pegs. If they are too far away from the marquee there will not be enough down force to keep the side poles from lifting causing the structure to fail. Too near and the roof will not be tensioned enough to resist the wind. A compromise is to have two sets of pegs one closer in than the other. The correct distance is normally just less then half the height of the side pole away from the marquee.

Another consideration is the amount of water contained within the ground. If the ground is saturated this will dramatically reduce the holding capacity of the ground. As the rain will run off the marquee at the edges this concentrates the water logging around the edge of the marquees.

Framed Marquees

Framed or Clear-span are not immune from blowing away! The wind has two effects. Firstly the wind tries to push the marquee horizontally which does not normally cause a problem. However the second effect is lift on the lea side of the marquee roof. This will lift the marquee. Although a marquee may only be lifted with a few kg of lift, the repeated lifting and falling of the marquee over many hours will knock the pegs out 1mm at a time.

Resistance to this can be improved by angling the pegs so as they are not in line with the lift. If the pegs do fail then the marquee will be lifted up then crashed down. This will cause the marquee to fail. If high winds are forecast you can guy a framed marquee down.

Rather than putting the guy ropes at a right angle to the marquee walls. You can put them parallel in line with the walls which provides excellent resistance to prevent the marquee from lifting.

Customers!

Your customers have an almost lemming like ability to do the wrong thing! You must stress both in your contract / T's and C's and face to face that if you open up the marquee on anything other than a calm day then a opening on a upwind wall must be matched with an equal size opening in the lea side wall.

At the same time impress on them the importance of not removing the guy ropes / pegs or cross bracing!

For more information please see the following:-

Temporary Structure Guidance

Wind Speed Statement

Safe use and operation of temporary demountable fabric tructures

HSE Event Saftey Guide (Second Edition)

Codes of Practice For Marquee Hire

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