Structures and structural members made wholly or partly of wood
AssigneeBalfour Beatty Limited
InventorsRichard G. Tyrer, James Milne
Life of this patent
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Abstract
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, fluid-impermeable 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.
Claims14
A method of impregnating with wood preservative at least a wooden part of a structure that is exposed to the atmosphere, which method comprises surrounding said exposed wooden part of the structure by a closely fitting, fluid-impermeable covering and sealing boundary edges of the covering to form a substantially fluid-tight enclosure;
- evacuating air and any other fluid from cracks and any other voids in the said wooden part of the structure and from within the fluid-tight enclosure;
- and allowing wood preservative in a flowable state to enter the enclosure and the cracks and other voids in said wooden part of the structure until said wooden part of the structure is fully impregnated with wood preservative.
A method of impregnating with wood preservative that part of an upright wooden pole that is exposed to the atmosphere, which method comprises surrounding at least a section of said exposed part of the pole by a closely fitting, fluid-impermeable flexible shroud and sealing boundary edges of the shroud to form a substantially fluid-tight enclosure;
- evacuating air and any other fluid from cracks and other voids in said section of said part of the pole and from within the fluid-tight enclosure;
- and allowing wood preservative in a flowable state to enter the enclosure and the cracks and other voids in said section of said part of the pole until said part is fully impregnated with wood preservative.
Dependencies are inferred from the claim text.