NZ4202 - Unitec
NZ4202 - Unitec
NZ4202 - Unitec
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SNZ NZSr4202 95 = 8583169 0042532 T32<br />
Issued June 1995 NZS 4202: 1 995<br />
SECTION 24 - DRAINAGE<br />
24.1 OVERVIEW<br />
Refertosection O, General rules, which shall be read in conjunction with this section.<br />
24.2 PREAMBLES<br />
24.2.1 Rates to include<br />
(a)<br />
(b)<br />
Ratesfor trenching shall include excavation, backfilling, consolidation, carting<br />
away surplus material, maintaining and supporting sides of trenches, grading<br />
bottoms and keeping free from water;<br />
Rates for pipework shall include jointwork and cutting of pipes.<br />
24.3 GENERAL PRINCIPLES<br />
24.3.1<br />
Trenches shall be scheduled in metres.<br />
24.3.2<br />
Each size and quality of pipe shall be scheduled separately in metres. The<br />
description shall include the type of material and method of jointing.<br />
24.3.3<br />
Foul drains shall be scheduled separately from stormwater drains.<br />
24.4 MEASUREMENT PROCEDURE<br />
24.4.1<br />
Trench excavation for foul and stormwater drains shall be measured separately.<br />
24.4.2<br />
Trench excavation shall be measured stating the depth as 0-1.5 m, 0-3.0 m,<br />
0-4.5 m and so on in increments of 1.5 m and the average depth shall be stated.<br />
Backfill to excavations with hardfill or imported material shall be measured as extra<br />
value.<br />
24.4.3<br />
Rock excavation shall be measured in cubic metres as an extra value in accordance<br />
with the trench widths as determined by pipe diameter plus 300 mm or the following<br />
table whichever is the greater.<br />
i<br />
Size of pipe<br />
Trench width (m)<br />
Up to 1.0 m 1.0 m to 1.5 m Over 1.5 m<br />
in depth in depth in depth<br />
Up to 150 mm<br />
250 mm<br />
300 mm and over<br />
24.4.4<br />
Opening of roads, footpaths, and the like shall be measured as extra value. Making<br />
good if required shall be measured and described separately.<br />
1 .o<br />
1.1<br />
1.2<br />
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Copyright Standards New Zealand<br />
Provided by IHS under license with SNZ<br />
Document provided by IHS Licensee=<strong>Unitec</strong> Inst of Technology/5911177001,<br />
03/02/2005 18:31:52 MST Questions or comments about this message: please call<br />
the Document Policy Group at 303-397-2295.<br />
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