| 摘要 |
A spreader pipe for use in erecting concrete walls. The spreader pipe may contain at least one hole in its wall which is then covered with an impermeable cuff to prevent the poured concrete from passing into the spreader pipe. Once the wall has been erected and the boarding plates removed, grout may be injected into the spreader pipe in such a manner that it flows through the at least one hole and passes from the cuff into the hollow spaces and cracks in the concrete wall around the spreader pipe thereby making the concrete wall substantially waterproof. Alternatively, the spreader pipe may contain weak spots, rather than the at least one hole, which are punctured by the pressure of the grout being forced into the spreader pipe, thereby filling the hollow spaces and cracks in the concrete wall around the spreader pipe.
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