Abstract: An expansion device for breaking solid materials, including at least one hose element having an inner expansion chamber with a non-circular cross section before pressurization or having an inner pressuring means and/or a reinforcement arranged on the outside of the inner expansion chamber which has a non-circular cross section before pressurization. The inner pressuring means is arranged around the inner expansion chamber and the reinforcement is arranged around the inner pressuring means. Optionally an outer layer is arranged around the reinforcement, having at least one “directional-breaking-force amending” material portion which is arranged outside the reinforcement. The at least one hose element has a coupling connection on a first end of the hose element, and optionally a second coupling connection on a second end of the hose element.

Abstract: A device for breaking solid material comprises an expansible hose element which is insertable into a hole in the solid material and has an externally substantially geometrically regular cross-section. At least at one of its ends, the hose element comprises a coupling. The device further comprises at least one expansion portion with an expansion chamber. The hose element further comprises an expansion limiter which has a varying radial distance from the outside of the hose element along the circumferential direction of the hose element.