Pit Workers in the Old Days #14: Wood Cribbing (Collapse Prevention Method by Timbering)
1958 - 1963

Mukashi no Yamabito #14: Ki-kozumi (Koboku ni yoru Boraku Hoho)
[Pit Workers in the Old Days #14: Wood Cribbing (Collapse Prevention Method by Timbering)]
21.2 x 30.3 cm Ink Painting

Text at the Right End
Wood cribbing (ki-kozumi or kozumi) filled with debris (bota) was called mi-kozumi and cribbing which was unfilled and only made of timber was called kara-kozumi. These kinds of cribbing were perfect protective measures against roof falls, able to withstand rock pressure no matter how great it was. However, most pits would not adopt them because of the great expense required, except those in exceptionally good financial condition. Just as a poor person is reluctant to withdraw the last of his/her money from the bank, so too were we loathe to remove these supports. The mi-kozumi was daringly built in long-section workings after removing the main safety coal pillars.
Note: Kara-kozumi and mi-kozumi were sometimes respectively called karako and miko for short.

Text at the Top Left
The karako could be moved after it became unnecessary, but the miko was hard to move.


Translation Assisted by Mr. Nathan Johndro

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