| 摘要 |
<p>A wooden part of a structure or structural member, e.g. a telegraph pole,that is exposed to the atmosphere is impregnated with wood preservative by a vacuum impregnation process. The exposed wooden part of the pole is surrounded by a closely fitting, fluidimpermeable covering, e.g. a polythene shroud, and boundary edges of the covering are sealed to form a substantially fluid-tight enclosure. Air and any other fluid is evacuated from voids in the said wooden part of the pole and from within the fluid-tight enclosure and wood preservative in a flowable state is allowed to enter the enclosure and the voids in said wooden part of the pole until said wooden part is fully impregnated with wood preservative.</p> |
