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A trench box in use with chains still attached and a ladder in place. Trench shields (also called trench boxes or trench sheets) are steel or aluminum structures used to avoid cave-ins and protect utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by ...
A box crib is the simplest, most stable and most common method of cribbing. It is constructed by arranging sets (two or more) of matched blocks in a regular log-cabin style to form a rising square or rectangular frame. The more blocks on each level, the greater the number of support points and therefore the greater the strength of the crib tower.
Trench shoring is the process of bracing the walls of a trench to prevent collapse and cave-ins. The phrase can also be used as a noun to refer to the materials used ...
A box cut (box pit) is a small open cut built to supply a secure and safe entrance as access to a slope to an underground mine. Generally the box cut is sunk until sufficiently unweathered rock is found to permit the development of the decline. [ 1 ]
In the close confines of a trench, rifles and fixed bayonets were often too long for effective use, and entrenching tools were often used as auxiliary arms for close quarters combat. [13] In Nancy Mitford 's 1945 novel, The Pursuit of Love , there hangs over the chimney-piece an entrenching tool "with which, in 1915, Uncle Matthew had whacked ...
However, it seems more likely that it originally alluded to pillar boxes, with a comparison being drawn between the loophole on the pillbox and the letter-slot on the pillar box. [ 4 ] The term is found in print in The Times on 2 August 1917, following the beginning of the Third Battle of Ypres ; and in The Scotsman on 17 September 1917 ...
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