Tire tread having incisions

A tread made of a rubber compound for a tire, this tread having a thickness E and comprising a plurality of raised elements delimited by cuts, each raised element comprising:

• a contact face intended to come into contact with the road surface, and
• lateral faces intersecting this contact face along edge corners,
• wherein a collection of contact faces of the raised elements forms a tread surface of the tread,
• wherein at least one of these raised elements comprises at least one sipe of a maximum depth (H) at most equal to the thickness (E) of the tread, this at least one sipe running in a main direction determined by the ends of the line of the at least one sipe on the tread surface in the as-new condition and a secondary direction running into the thickness of the tread,
• wherein this at least one sipe is made up of a first part and a second part,
• wherein the sipe first part runs in the secondary direction between the contact face in the as-new condition and a depth (H1) at least equal to 40% of the maximum depth (H), and
• wherein the sipe second part extends the sipe first part into the thickness of the tread,
• wherein this sipe second part extends over a depth (H2),
• wherein the sipe first part, of total length (L) measured on the tread surface when the tread is in the as-new condition in the main direction, divides the raised element over the depth (H1) into two raised-element parts which are disjointed from one another, wherein:
• the sipe second part comprises, in the main direction of the sipe, at least one first portion and at least one second portion, these two portions each having a length less than the length (L),
• each first portion being formed of a sipe comprising at least two branches disjointed from one another, wherein these at least two branches are spaced from one another by a maximum distance (D1), and wherein the at least two branches of a first portion are not offset from each other relative to the main direction of the sipe, and
• each second portion, situated in the extension of a first portion in the main direction of the sipe and disjointed from any first portion, being formed in such a way as to create a mechanical connection between the extensions into the depth over the height (H2) of the raised-element parts that are disjointed from one another between the contact face and the depth (H1).