B, D, E CLASS PROPS: WHAT IS THE DIFFERENCE AMONG THEM?

GBM produces three different classes of heavy duty post shores, subdivided in several different models according to the maximum extension they can reach. The legislation DIN EN 1065 sets the standards that every component and every characteristic of the post shores has to meet, among them it is important to note the quality of steel, the data in the marking made by the producer, the extension of the items and above all the key factor: the Characteristic Strength that post shores need to have.

Acknowledging that this is the value that determines the capacity of a post shore, that is obtained by dividing the characteristic strength for a factor of 1,65, here are the requirements of the various classes in details.

DIN EN 1065 Class B post shores

Class B post shores can only be classed as such if and only if in EVERY extension that they reach, the characteristic strength is higher or equal to the one provided by the legislation; the strength is given by the formula 68,0*l/l^2, where l means the extension of the post shore expressed in meters.

To understand better what this means practically, creating a graph in which every value of l is substituted in the formula above, we obtain a curved line called line of the characteristic strength of class B post shores. In order to comply with the legislation, visually speaking, the post shore needs to be placed in the area above the curved line (blue).

Class B post shores of GBM fulfil this condition widely, as illustrated by the lines representing these three models B30, B35 and B40.

DIN EN 1065 Class D post shores

Class D post shores can only be classed as such if and only if in EVERY extension that they reach, the characteristic strength is higher or equal to the one provided by the legislation; the strength is given by a fixed value of 34,0 Kn.

Turning this value into a graph we obtain a straight line called line of the characteristic strength of class D post shores; in order to comply with the legislation, visually speaking, the post shore needs to be placed in the area above the straight line (blue).

Also in this case, Class D post shores of GBM fulfil this condition widely, as illustrated by the lines representing the five models D30, D30 ECO, D35, D40 and D55.

DIN EN 1065 Class E post shores

As in the case of class D, Class E post shores can only be classed as such if and only if in EVERY extension that they reach, the characteristic strength is higher or equal to the one provided by the legislation; the strengths is given by a fixed value of 51,0 kN.

Turning this value into a graph we obtain a straight line called line of the characteristic strength of class E post shores; In order to comply with the legislation, visually speaking, the post shore needs to be placed in the area above the straight line (blue).

Also in this case Class E post shores of GBM fulfil this condition widely, as illustrated by the lines representing the three models E30, E35 and E40.

So, is there a way to understand which post shore better meets my needs?

If you already know the extension and the capacity you need even before to use post shores, then yes, there is.

Consulting the table below, it is possible to understand which class(-es) of post shores is/are the ideal, based on the extension of use and on the capacity needed.

For instance:

1) Having to work at an height of 2,8 meters inside a building site, and needing a capacity of 19 kN, a class B post shore may not be enough, since at that height nominally it has to have a capacity of at least 14,71 kN. In case of the GBM class B post shores, at that height, all the models would be post shoreer, since they have the following capacities:

• 24,8 kN for the model B30;
• 21,1 kN for the model B35;
• 22,8 kN for the model B40.

2) Having to work at an height of 3,4 meters inside a building site and needing a capacity of 29 kN, class B post shores do not reach those capacities at such height so since the needed capacity is higher than the minimum one of the class D, a class D or E post shore should be used. The GBM post shores that fulfil such capacities at the extension here required are the following:

• 31,9 kN for the model D40
• 39 kN for the model D55;
• 35,3 kN for the model E35;
• 41 kN for the model E40.