Cast-in-place through-penetration firestop device

1 . A cast-in pass-through firestop device, comprising:

a hollow tubular body, wherein the hollow tubular body comprises a first tubular body part and a second tubular body part, the first tubular body part overlapping with the second tubular body part along a principal axis;

a bayonet locking mechanism for adjusting overlap of the first tubular body part and the second tubular body part, wherein the bayonet locking mechanism comprises:

a key pin radially projecting from the first tubular body part,

a key passage radially recessed in the second tubular body part, and

the key pin being radially engaged with the key passage, wherein the key passage comprises at least two first sections being arranged in different planes which are perpendicular to the principal axis, and a second section arranged at least partly in parallel to the principal axis and connecting the at least two first sections, and

a sealing ring, wherein the sealing ring is mounted rotatably on the first tubular body part and comprises a radially projecting sealing ridge engaged with the second section of the key passage, and

an inlay made of an intumescent firestop material arranged within the hollow tubular body.

2 . The cast-in pass-through firestop device according to claim 1 , wherein the at least two first sections are displaced to each other along the principal axis by first distances, and the key pin is displaced to the sealing ring by a second distance, wherein the second distance is different to the first distance.

3 . The cast-in pass-through firestop device according to claim 1 , wherein a dimension along the principal axis of the at least two first sections is smaller than a dimension along the principal axis of the sealing ridge.

4 . The cast-in pass-through firestop device according to claim 1 , comprising a lid removably attached to the hollow tubular body, the lid comprising one or more threads for engaging with the hollow tubular body, and wherein each thread of the one or more threads is formed by one or more ribs that are arranged along a helical curve and separated along the helical curve by a gap.

5 . The cast-in pass-through firestop device according to claim 1 , comprising a base plate and a metallic ring, wherein the metallic ring is arranged between the base plate and the inlay.

6 . The cast-in pass-through firestop device according to claim 5 , wherein the metallic ring comprises radially extending fingers, and

wherein the hollow tubular body comprises radial slits into which the fingers are engaged.

7 . The cast-in pass-through firestop device according to claim 6 , wherein the metallic ring is made of two halves.