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Let $\mathbb F$ be a real closed field. We define the notion of a maximalframing for a representation of the fundamental group of a surface with valuesin ${\rm Sp}(2n,\mathbb F)$. We show that ultralimits of maximalrepresentations in ${\rm Sp}(2n,\mathbb R)$ admit such a framing, and that allmaximal framed representations satisfy a suitable generalisation of theclassical Collar Lemma. In particular this establishes a Collar Lemma for allmaximal representations into ${\rm Sp}(2n,\mathbb R)$. We then describe aprocedure to get from representations in ${\rm Sp}(2n,\mathbb F)$ interestingactions on affine buildings, and, in the case of representations admitting amaximal framing, we describe the structure of the elements of the group actingwith zero translation length.

Maximal representations, non Archimedean Siegel spaces, and buildings