NZ4202 - Unitec

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