Drawing $3$ Culvert

This is a section through a precast concrete box culvert beneath a road. Hereese the details

$1$ Project title recast Concrete Box Culvert beneath Road and Cycle path'

$2$ Culvert length to be $25m$

$31$ in $100$ fall

$4$ Backfill material will be Class $6N$

$5$ Fill over the culvert consists of Class $6N$

$6$ Culvert to have internal width of $2000mm$

$7$ Culvert to have internal cross$-$sectional area of at least $3\mathrm{.}9m^2$

$8$ Culvert to be manufactured and supplied by Marshalls Civil and Drainage $($see their table of stock sizes$)$

$9$ Height between top of culvert and formation level of road above to be minimum $800mm$

$10$ Top of culvert to be suitably waterproofed

$11$ No requirement for drainage layers alongside culvert

$12$ Benching of excavations to be $1$ in $1$

$13$ Original ground level located $2m$ below road level

Table of stock sizes by Marshalls Civil and Drainage

STOCK SIZES $-$ Designed to suit LM$1-$ LM$3$ loading with $0\mathrm{.}300-2\mathrm{.}00m$ cover

$\backslash$table$[[$Reference$,$Eff. Area,$\backslash$table$[[$Internal$],[$Dimensions$]],,\backslash$table$[[$External$],[$Dimensions$]],\backslash$table$[[$Normal$],[$Thickness$]],\backslash$table$[[$Approx$],[$Weight$]],],[$Stock item,m$.$sq$,$Width m$,$Height m$,$Length m$,$Width m$,$Height m$,$Walsmm,Slabs mm$,$Tonnes$],[$MC $10\mathrm{.}05,0\mathrm{.}485,1\mathrm{.}000,0\mathrm{.}500,2\mathrm{.}000,1\mathrm{.}300,0\mathrm{.}800,150,150,2\mathrm{.}76],[$MC $12\mathrm{.}07,0\mathrm{.}904,1\mathrm{.}250,0\mathrm{.}750,2\mathrm{.}000,1\mathrm{.}550,1\mathrm{.}050,150,150,5\mathrm{.}26],[$MC $15\mathrm{.}10,1\mathrm{.}440,1\mathrm{.}500,1\mathrm{.}000,2\mathrm{.}000,1\mathrm{.}850,1\mathrm{.}350,175,175,3\mathrm{.}60],[$MC $15\mathrm{.}15,2\mathrm{.}190,1\mathrm{.}500,1\mathrm{.}500,2\mathrm{.}000,1\mathrm{.}850,1\mathrm{.}850,175,175,6\mathrm{.}13],[$MC $17\mathrm{.}07,1\mathrm{.}252,1\mathrm{.}750,0\mathrm{.}750,2\mathrm{.}000,2\mathrm{.}100,1\mathrm{.}100,175,175,5\mathrm{.}26],[$MC $20\mathrm{.}10,1\mathrm{.}940,2\mathrm{.}000,1\mathrm{.}000,2\mathrm{.}000,2350,1\mathrm{.}350,175,175,6\mathrm{.}13],[$MC $20\mathrm{.}20,3\mathrm{.}940,2\mathrm{.}000,2\mathrm{.}000,2\mathrm{.}000,2\mathrm{.}400,2\mathrm{.}400,200,200,9\mathrm{.}06],[$MC $25\mathrm{.}15,3\mathrm{.}690,2\mathrm{.}500,1\mathrm{.}500,1\mathrm{.}500,2900,1\mathrm{.}950,200,225,7\mathrm{.}32],[$MC $27\mathrm{.}18$ A$,4\mathrm{.}800,2\mathrm{.}700,1\mathrm{.}800,1\mathrm{.}500,3\mathrm{.}150,2\mathrm{.}300,225,250,9\mathrm{.}11],[$MC $30\mathrm{.}10$ A$,2\mathrm{.}940,3\mathrm{.}000,1\mathrm{.}000,1\mathrm{.}500,3\mathrm{.}450,1\mathrm{.}500,225,250,8\mathrm{.}33]]$

Corner Splays $-$ MC$.10\mathrm{.}05-0\mathrm{.}1500\mathrm{.}050m$ MC$.12\mathrm{.}07-0\mathrm{.}2250\mathrm{.}075m$ All other sizes $-0\mathrm{.}3000\mathrm{.}100m$

Typical notes for drawing

$1$ THE TRENCH SHALL BE EXCAVATED TO A WIDTH EQUAL TO THE BOX CULVERT PLUS $600MM$

$2$ BEDDING SHALL COMPRISE WELL COMPACTED SELECTED GRANULAR MATERIAL OVER THE FULL WIDTH OF THE TRNCH TO A MINIMUM DEPTH OF $200MM$

$3$ BLIND THE SURFACE WITH FINE MATERIAL TO ASSIST IN LEVELLING

$4$ AN ALTERNATIVE TO GRANULAR BEDDING IS A $75$MM THICK CONCRETE BLINDING LAYER

$5$ BACKFILLING SHOULD COMMENCE AS SOON AS POSSIBLE AFTER BOX CULVERTS HAVE BEEN LAID

$6$ FILL THE TRENCH TO THE LEVEL OF THE TOP OF THE BOX CULVERT WORKING EVENLY ON EACH SIDE

$7$ USE SELECTED BACKFII.I. MATERIAI, WEI. COMPACTED II $200MM$