Embedded bolt - Umekomi bolt

…After the war, the Japanese mountaineering world recovered rapidly, thanks to the import of superior equipment and new techniques, as well as the influence of the first ascent of Manaslu in 1956, which gave rise to many mountaineering enthusiasts. Along with the widespread use of imported equipment, rock climbing became popular, and in particular the use of recessed bolts and double rope techniques for artificial climbing made it possible to climb difficult vertical walls and rock overhangs, and many new routes were created, but this also created the problem of multiple complicated first ascent routes overlapping on narrow rocky areas. However, difficult ascents continued to be carried out on these routes in the harsh winter. …

*Some of the terminology that refers to "embedded bolts" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…戦後，急速に立直りをみせた日本登山界は，優秀な用具や装備とそれに伴う新しい技術の輸入や，56年のマナスル初登頂の影響などもあって多くの登山愛好者を生んだ。輸入された用具の普及とあいまって岩登りが流行し，とくに，埋込みボルトの使用とダブルロープ技術による人工登攀によって，困難な垂直壁や岩びさしなどの登攀が可能になり，多くの新しいルートがつくられたが，狭い岩場で煩雑な初登ルートが重なり合うような弊も生まれた。しかし，これらのルートでは厳冬期の困難な登攀が続いて実行された。…

※「埋込みボルト」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報