| 摘要 |
PCT No. PCT/SE81/00398 Sec. 371 Date Nov. 19, 1982 Sec. 102(e) Date Nov. 19, 1982 PCT Filed Dec. 30, 1981 PCT Pub. No. WO82/03240 PCT Pub. Date Sep. 30, 1982.In the manufacturing of wood poles a number of sections are glued together along abutting side surfaces (7, 8) so that a tubular pole (19) with a central cavity is formed. The side surfaces (7, 8) which have been provided with glue are brought into intimate contact with each other so as to give a tube (19). Sealing covers (20, 21) of the lika are placed at both ends of the tube so that these are sealed, whereafter air is pumped out from the central cavity (23) through one or both of the said covers so as to give a vacuum in the cavity in comparison with the external pressure, whereby the contact pressure between the abutting side surfaces increases. The vacuum is maintained until the glued joints (31) have been fixed. |
