| 摘要 |
PCT No. PCT/SE91/00369 Sec. 371 Date Nov. 19, 1993 Sec. 102(e) Date Nov. 19, 1993 PCT Filed May 24, 1991 PCT Pub. No. WO92/20901 PCT Pub. Date Nov. 26, 1992.A device for injecting concrete, plastic or the like into cracks in a concrete structure, a rock face or the like comprises an elastic, radially expandable and substantially tubular body adapted to be securely and sealingly engaged within a bore hole in communication with the cracks. The body has a first end portion with a non-return valve to be introduced deepest into the bore hole and a second end portion adapted to be connected to a feed pipe for the material to be injected. The elastic body is formed as an integral unit and is adapted to expand into engagement with the bore hole before the non-return valve opens at a predetermined pressure to inject the material into the bore hole.
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