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By D. W. Quinion, G. R. Quinion

This advisor offers information regarding the evaluation of pumping and walling platforms for extracting groundwater. Contents contain research of soil and groundwater, dewatering, defense, trench and underground excavations

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Employers Confederation, London, 1961. Construction edn. Longmans, Harlow, 1986. (General Provisions) Regulations. Building Tomlinson M. J. Foundation design and construction, 5th 47 ICE WORKS CONSTRUCTION G U I D E S Other Access scaffolding, C. /. A. B. Norrey and G. R. Chantler, Forrester Earthworks, P. C Falsework, C. /. Pile driving, W. A. and G. H. Thompson Dawson Site handling equipment, R. Illingworth Site investigation, A. D. Robb Concrete: materials technology, /. F. Troy Concrete site work, Graham series D.

When the groundwater requires lowering to a level too deep for a system installed at or near to ground level to cope, then providing there is space for them, additional 8. EXCAVATIONS USING GROUND SUPPORT SYSTEMS Ground support systems are used for deep excavations, for excavations adjacent to existing structures, pavements and services, and for others where the use of 32 systems can be installed at lower operational levels as shown in Fig. 15. It may be economic to deal with a short length of such a deep trench but continuous sheeting or other methods may be preferable for dealing with restricted access or local ground stability.

Wellpointing Wellpointing is usually installed to extract the water from the ground before the trench is excavated and hence avoid instability of the excavated faces caused by water emerging through them. The method depends on the permeabilities of the soil layers and the requirements for access to the trench. It may entail either a single-sided system with the wellpoints and their header pipe installed along one side of the trench only, or a double-sided system with wellpoints and connecting header pipe on each side of the trench.

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