trench without shoring

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• Shoring — is a general term used in construction to describe the process of supporting a structure in order to prevent collapse so that construction can proceed. The phrase can also be used as a noun to refer to the materials used in the… …   Wikipedia

• Trench shield — Trench shields are steel or aluminum structures used for protecting utility workers while performing their duties within a trench. They are customarily constructed with sidewalls of varying thicknesses held apart by steel or aluminum spreaders.… …   Wikipedia

• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

• international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …   Universalium

• performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical.       The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains …   Universalium

• New Zealand — New Zealander. /zee leuhnd/ a country in the S Pacific, SE of Australia, consisting of North Island, South Island, and adjacent small islands: a member of the Commonwealth of Nations. 3,587,275; 103,416 sq. mi. (267,845 sq. km). Cap.: Wellington …   Universalium

• Roman infantry tactics — refers to the theoretical and historical deployment, formation and maneuvers of the Roman infantry from the start of the Roman Republic to the fall of the Western Roman Empire. The article first presents a short overview of Roman training. Roman… …   Wikipedia

• Retaining wall — A retaining wall is a structure that holds back soil or rock from a building, structure or area. Retaining walls prevent downslope movement or erosion and provide support for vertical or near vertical grade changes. Cofferdams and bulkheads,… …   Wikipedia

• Arthur Wellesley, 1st Duke of Wellington — Duke of Wellington and The Iron Duke redirect here. For subsequent dukes, see Duke of Wellington (title). For the film, see The Iron Duke (film). Field Marshal His Grace The Duke of Wellington KG GCB …   Wikipedia