Create anchor plan

Have you ever asked yourself: How do I create an anchor plan for anchoring permanent scaffolding anchors in façades to protect them so that I can incorporate this plan into the façade planning and the revision drawings and, ideally, pass it on to the façade builder / scaffolder? If you can answer this question with a sustainable YES, we offer you here an exemplary guide to creating an anchor plan with isorocket® permanent scaffolding anchors.

The basis: DIN 4426

First of all, however, we would like to remind you that the “Anchoring of scaffolding in façades” is regulated in Germany by DIN 4426, Section 7. In brief, this can be summarized as follows. Basically, as a planner/architect, you must provide appropriate devices for future work on façades if the project has an eaves height of over 8 m and no façade access system.

  • These permanent devices (permanent anchor points) should be planned in anchorage levels that do not exceed 4.00 mtr.
  • The respective anchoring points with their characteristic actions must be dimensioned in total so that 2.25 kN per running meter of façade length can be absorbed at right angles to the façade (i.e. pull-out value / tensile load-bearing capacity).
  • Furthermore, the anchor point parallel to the façade (i.e. transverse load-bearing capacity) must be able to absorb 0.75 kN per running meter of façade length.

These are actually the essential requirements on the basis of which you can create the anchor plan with the following description, or you can calculate how many anchor points will be necessary when using the isorocket® permanent scaffold anchor on the respective side of the façade.

1. choosing the right anchor

As we are presenting the creation of an anchor plan with isorocket® permanent scaffolding anchors at this point, we naturally assume that you only want to work with products approved by the building authorities. Accordingly, there are only two relevant questions to answer:

  • To which substrate (masonry or concrete) are the permanent anchors fixed?
  • What construction thickness (wall former to outer edge) do you need?

isorocket® permanent scaffolding anchors are available for both masonry and concrete for the following construction thicknesses:

  • isorocket® Mini 100 – 179 mm
  • isorocket® Midi 180 – 259 mm
  • isorocket® Maxi 260 – 339 mm
  • isorocket® Mega 340 – 419 mm

For our example anchor plan, we assume a concrete substrate and an isorocket® Midi Concrete

2. number of anchoring levels

First, we determine the façade height and the façade width of the façade to be equipped by us with an anchor plan, e.g:

Building height: 9.00 mtr.
Building length: 12.50 mtr.

The building height divided by 4 meters results in the minimum number of horizontal anchoring levels on the corresponding façade:

9.00 mtr. ÷ 4 = 2.25 = 2 anchoring levels must be planned

These can be 4 and 8 mtr., but can also be set by the planner to building-specific requirements of 3.50 and 7.40 mtr. if this appears to be sensible due to the storeys, the geometry or any building technology.

This means that we have basically already decided the first important step and now of course still have to answer the question of how many anchor points need to be positioned on the three anchorage levels in order to comply with DIN 4426.

3. number of anchors per anchorage level and in total

To calculate the number of anchors, we have to take into account the two load-bearing capacities required by DIN 4426 (tensile load-bearing capacity 2.25 kN per running meter of façade length and transverse load-bearing capacity 0.75 kN per running meter of façade). facade length and transverse load-bearing capacity 0.75 kN per running meter. facade length) and arrive at the following values to be achieved:

Façade length: 12.50 mtr.
Total tensile load-bearing capacity (DIN): 28.1 kN (12.50 x 2.25 kN)
Total transverse load-bearing capacity (DIN): 9.4 kN (12.50 x 0.75 kN)

For the final calculation, we now need the exact values of the isorocket® Midi Concrete (building authority approval, page 12):

Midi Concrete / tensile load-bearing capacity: 43.4 kN
Midi Concrete / transverse load-bearing capacity: 2.56 kN when installed

With a required load-bearing capacity of 28.1 kN, 1 piece of isorocket® Midi Concrete is sufficient to achieve the tensile load-bearing capacity in this case. Formula: 28.1 ÷ 43.4 = 0.65.

The situation is somewhat different for the transverse load-bearing capacity. Here we need 9.4 kN on one anchoring level and must calculate as follows:

Transverse load-bearing capacity: 9.4 kN ÷ 2.56 kN = 3.67 or 4 isorocket® Midi Concrete permanent scaffold anchors per anchoring level. With the 2 anchoring levels determined in advance, we thus arrive at a total of:

8 Permanent scaffolding anchors

As a planner/architect, you can now plan and draw these as evenly as possible on each anchoring level where you think it is best positioned.
They should be planned as evenly spaced as possible and approx. 50 cm away from the corner of the façade in the outer area, whereby it is advantageous if the individual anchoring levels are planned slightly offset above one another so that the anchor points are not always congruent with one another. In principle, it is also possible to plan the determined number of permanent scaffolding anchors in the sample façade calculation on 3 anchoring levels if this is necessary for any reason. In this case, however, you should plan one more anchor so that there are 3 permanent anchors per anchoring level.

Conclusion

Further design resistances (e.g. for interaction or displacement under service load) are noted in the approval, which we will not go into at this point. In the case of separate, more precise calculations, these are corresponding values that will provide your structural engineer with further information at the point of more detailed calculations. It may be that the local scaffolder complains that these anchor points are not in the grid dimension of his system scaffolding and that it is therefore more complex to anchor. However, this is a fact that will come up again and again, because a different scaffolder will come along with his bay sizes when the scaffolding is refitted at a later date.
It is therefore correct and important from a planning perspective to have the planner/architect plan the anchor points according to the local requirements so that the respective scaffolder can and must adapt to them. The scaffolder can then install an internal brace, from which he can also occupy the anchor point accordingly. Alternatively, there is the holistic system solution from isorocket® with the rocketrail, for which you can find more information on our website.

Online calculator for the anchor quantity per façade side

Finally, we offer you the following link to an ingenious permanent anchor calculator, with which you can easily determine and tender the required quantity of permanent scaffolding anchors (in accordance with DIN 4426) for any number of walls.