This equipment comprises at least one anchoring assembly including two antagonistic hooks connected to each other through a rod, a first of these hooks having a body crossed by a hole for letting through the rod and being able to be connected to connection means with which the anchoring assembly may be connected to another part of the equipment; said body has an aperture laid out substantially perpendicularly to the axis of said hole, communicating with this hole, and the anchoring assembly has a tightening member which may be engaged into this aperture until it abuts against the rod engaged in the hole, and tightened in order to immobilize this rod in this hole. Said tightening member is directly connected to a part belonging to said connection means, which allows the mounting of the latter on the body of said first hook.