BELL HOLE BOX

A bell hole box with an open bottom for protecting construction workers from wall cave-in when working below a surface of the Earth may utilize two, opposing, generally concave walls with generally straight panels portions. The two walls may be connected using multiple spreaders that are pinned or c...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	Burleson, Michael Todd
Format:	Patent
Sprache:	eng
Schlagworte:	BUILDING BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FORMS FOUNDATIONS HANDLING BUILDING MATERIALS ON THE SITE HYDRAULIC ENGINEERING REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS SCAFFOLDING SHUTTERING SOIL SHIFTING UNDERGROUND OR UNDERWATER STRUCTURES
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