CONCRETE RETAINING BLOCK WALL SPECIFICATION AND BILL OF QUANTITIES EXAMPLES NOW AVAILABLE ON AUTOSPEC
:
Article Date: 23 January 2008
 The Concrete Manufacturers Association (CMA) has announced that samples of a detailed standard specification document and a standard bill of quantities layout for concrete retaining block walls (CRB) are now available on AutoSpec, the web-based product specification tool for the construction industry.
CMA director, John Cairns, says this should help specifiers prepare proper job specifications for CRB wall construction.
“In many instances South African CRB wall contractors are being issued with job specifications which lack essential information and are quite inadequate, and the posting of sample specification and bills of quantity documents on AutoSpec will help alleviate this situation.
“There should be no excuse for the submission of inadequate CRB wall specifications, nor for the omission of drawings. All CRB wall specifications should be accompanied by a set of drawings showing heights, and all the other pertinent information.
“In addition to AutoSpec, the CMA has published a CRB wall installation manual which includes a typical bill of quantities and covers all the requirements for constructing a CRB wall. The Association has also produced a film (available on CD) which provides step-by-step construction guidelines.
“CRB wall specifiers should also refer to two SABS standards, SANS 207 for geofabric material used to stabilize crb walls, and SANS 508 : 2007, a specification for retaining blocks. The latter is in its final draft form and should be approved during the first half of 2008,” advises Cairns.
The unfortunate consequences of what can and does happen if a CRB wall is not properly specified are clearly demonstrated in this picture
This is an excellent example of a CRB wall which has been properly specified and then constructed according to those specifications.
|
