クラムシェル掘削は，立坑内の作業員がクラムやこぼれた土砂にあたる。また

クラムシェル掘削は，立坑内の作業員がクラムやこぼれた土砂にあたる。

また，クラムが支保工に接触し事故を招く危険性があるので，誘導員の配置と合図を徹底させ，作業半径内の作業を休止し，ロープ張り等により支保工を防護する。

結果 (英語) 1:

Clamshell digging clam, workers in the shaft and spilled debris hits.Also, because there is danger of late shoring to touch things with crumb, ensure alignment of employee induction and signaling, pause and work within a radius of, protecting the shoring by rope tension, etc..

結果 (英語) 2:

Clam shell drilling, workers in the pit falls on crumbs and spilled sediment. In addition, because there is a risk of causing a crumb is brought into contact with the shoring accident, to ensure the placement signals the induction members, to suspend the work of the working radius, to protect the支保Engineering by the rope tension and the like.

結果 (英語) 3:

Clam shell in shaft excavation ， workers clam and fell to earth.The ， ， clam when there is a risk that the timbering accident leads to contact, so ， by signs and placement to suspend work in the working radius ， by the rope on the protection to support.