| 摘要 |
<p>Inflow and outflow openings are closable by valves with soft tubes linking the openings. These are incorporated in a sheath of flexible material e.g. plastics, for accommodating forwarded and hard-setting substances for filling hollow spaces, esp. in mining. The sheaths are connected to each other and to the support wall, or surface to be supported, by force and/or form-locking action. Fixtures may be provided at the edges, which overlap on adjacent sheaths and are pierced by bolts in the overlap area. The edges may have alternating or mutually offset grooves. Each sheath front and rear wall can be inter-connected by pref. hollow cross arm stems and the rear wall is pref. more resilient than the front one.</p> |
