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...

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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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Beschreibung
Zusammenfassung:	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 connected to each of the two, opposing walls. Each longitudinal end of the bell hole box is open to permit passage of a pipeline through it. Numerous vertical guard posts may be connected around a top frame rail and joined together with chains. The bell hole box may be lifted in and out of a hole with mounted lifting hooks.