Drawings for Sewer and Water - City of London

SOUARE FORMED CONCRETE COLLAR
Ex+end ouf 300nm olong existing sewer
oncl 225nm oround borrel orch open¡ng
o-SeeNofes4&8
DOG HOUSE
MA I NTENANCE
HOLE
STRUCTURE
BARREL
A
FLOVJ
l-.' I
EXISTING
SEWER
'DOG HOUSE" MAINTENANCE
:{l
I
I
I
I
I
Þ¡
I
I
I A
t..
t-
l-i Þ'"
iË'
l"i
,lt
BASE
lp'
,¡L
CONCRE TE
COLLAR c0L
HOLE PROFILE
1 200rm MIN
FLOW->
FLOW
CHANNEL
Exìsting sewer Íust be
cut of the sÞring-l ine
ocross ful I înternol
w¡drh or structure
B
SECTION 'A_A'
CONCRETE
COLLAR
FLOW+
REINFORC¡NG
AS SPEC IF IED
I 50Ím
MI
REMOVE TOP HALF OF EX. PIPE AFTER
MAINTENANCE HOLE IS CONSTRUCTED
OR FORM NEAT CI{ANNEL AS SPECIFIED
SIZE OF OPENING TO FIT
EXISTING SEYIER PLUS 75nm
z
=
19rm CRUSHED STONE
BEDDING. MIN 150rm
POURED IN PLACE CONCRETE BASE
PRECAST CONCRETE BASE
SECTION 'B-B'
NoTES
ùtrt/ I ll.Jl\ tt-t
'l . The doghouse rnoinlenonce hole Íìoy only be usecl for plocing o new rnointenonce hole on on exísf ing
sonifory or storm line when instollotion of o s+ondord rno¡ntenonce hole is not Þroc+icol.
2. All mo¡ntenonce hole coñponents ore +o rnee+ oPSD 70'l .
3. Al I benching ¡s fo meet 0PSD 701.21.
4. Al I poured ¡n ploce concrefe to be 30 MPo.
5. Concre+e bond¡ng ogen+ mrs+ be opÞlied +o oll in+erfoces of precost to cost-¡n-Þloce concrete.
6. Full +¡me inspec+ion sholl be provided by +he consul+ing eng¡neer during insfollo+ion of
this s+ruc+ure ond +he consultonf sholl provicle written cer+ifÌcofion of ¡ns+ollot¡on to the
City of London. The strucfure rrust no+ be bockf ¡lled for minirnrm 24 hr ofter consfruc+ion to
ol low for secondory inspec+¡on os required
7. The top of +he existing nrcinline sewer rrusf be fully removed from springline ocross
the ful I ïn+ernol wï