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MUNICIPAL CASTINGS. A proposal on the subject of industry standard development. Dimensional based technical specification.
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A PROPOSAL ON THE SUBJECT OF PRIVATE STANDARDIZATION
THE SUBJECT OF PRIVATE STANDARD DEVELOPMENT
Date of proposal: Secretariat of Organization
TCs WGsAuthor of proposal:
THE PROPOSAL
Title of proposal:"Dimensions of special product of vehicular area manhole cover, of round opening, of cast iron construction, size DN.775mm or 30.70in (D.770/775), and 360, 400, 600, 900 kN loading class."Material: - grey cast iron - of grade to fit the loading class in compliance with thicknesses of pieces.
The document proposal comes to settle up a dimensional based private standard document (as case, a publication / deliverable) concerning the dimensions of special product of a street manhole cover - which may be in concordance with requirements of one or more regional basic standard(s) of cast/ductile iron manhole covers, - e.g. the regional CEN standard - "EN124 - Gully tops and manhole tops for vehicular and pedestrian areas. Design requirements, type testing, marking, quality control", - or, with other basic standard concerning street or residential area, manhole covers - as long the basic standard (e.g. as the EN124 is) does not apply for dimensions of special products of manhole covers.
Thus, the proposed private standard document (norm) aims to specify the main dimensions for a special product of a cast iron vehicular area manhole cover of DN.775mm/ 30.70in, of round opening; - and must, as case may be, completed with other standards which refers to testing, marking, quality control. (e.g. the EN124 CEN standard).
Short description of design related to product and main dimensions:
> Round (circular) frame with round opening;
- overall dia. of lid piece: 770mm (30.3125in),
- top opening of frame: dia. 775mm (30.50in), - round,
- top dia. of frame: 820...825mm (~32.375in), - round
- inner opening of base of frame - dia. 825; 920; (995)/1000mm (32.50; 36.25; 39.375in),
to fit a 800mm (32.5in), 36in (915mm), 1000mm dia. of manhole top opening.
- clearance (clear opening) of frame, - about 710...718mm ( 28...28.25in),
- 4 vent/key holes of about 40 sq.cm. (~6.20sq.in) at all clear opening;
which also allow an easy opening using common tools,
- optional, blocks for locking system fixing may be added, - on backside of lid piece.
As conclusion, the proposed document (norm) aims to specify the main dimmensions for a special product of a cast iron vehicular area manhole cover of DN.775mm (D.770/775) / 30.70in round opening; - and must, as case may be, completed with other standards which refers to testing, marking, quality control. (e.g. EN124 CEN standard).
The type of public standard document, as we consider the proposal may later transform into:
> concerning the therminology of EN45020:2006 description: - prestandard (3.3), product standard (5.4), technical specification (3.4), unilaterally aligned standard (6.8), - all of these to complete with the EN124 CEN standard which is a basic standard (5.1).
> concerning the therminology of ISO/CEI-2:2004: - international standard (3.3), technical specification (3.4), technical report (3.5), publicly available specification (3.7).
DN.770 - Lid Piece of D.770/775 Backside view - 4 vent holes design - DN.770 - Lid Piece of D.770/775 Backside view - 4 vent holes design -
Overall dia. O 770 ( 30-5/16”)Overall dia. O 770 ( 30-5/16”)
Central circularreinforcing rib
Central circularreinforcing rib
Intermediate circular
reinforcing rib
Intermediate circular
reinforcing rib
Perimetralreinforcing rib
Perimetralreinforcing rib
Radialreinforcing
rib
Radialreinforcing
rib
CMDCR 155 ( 6-1/8”)CMDCR 155 ( 6-1/8”)
CMDMR 425 ( 16-3/4”)CMDMR 425 ( 16-3/4”)
14;15;1614;15;16
R-4(5/32”)roundedge
R-4(5/32”)roundedge
R-4R-4AA AA
( 5/8”)( 5/8”)
27
0 (
10
-5/8
”)in
be
twe
en
ho
les
cen
tre
s
27
0 (
10
-5/8
”)in
be
twe
en
ho
les
cen
tre
s
MDER 690 ( 27-1/8”)MDER 690 ( 27-1/8”)
- Loading class, - 400; 600; 900 kN- Loading class, - 400; 600; 900 kN
Ribs reinforcement consists in:
- intermediate circular rib medium diameter
- central reinforcing rib medium diameter
- lower width of radial rib - the same shape as the central and intermediate rib - as lower width
Ribs reinforcement consists in:
- intermediate circular rib medium diameter
- central reinforcing rib medium diameter
- lower width of radial rib - the same shape as the central and intermediate rib - as lower width
OD (overall dia.) 770 ( 30-5/16”) OD (overall dia.) 770 ( 30-5/16”)
LIP Piece - DN.775 - 30.70” Backside view
Conical Lid plate design(multiple frustum of cones)
LIP Piece - DN.775 - 30.70” Backside view
Conical Lid plate design(multiple frustum of cones)
Reinforcing blockReinforcing block
AAAA
4 vent / pick holes at 90 degree4 vent / pick holes at 90 degree
75...8075...80
Hole clearance
detail
Hole clearance
detail
R32 R 13.5
4242
3232
Rib centre axe dia. 690 ( 27-1/8”)Rib centre axe dia. 690 ( 27-1/8”)
Outer lower part
Outer lower part
In concordance withvertical section A - Aof conical lid plate structure
In concordance withvertical section A - Aof conical lid plate structure
FRAME Piece - DN.775 - 30.7” Top plane view
- high grade iron construction (350; 400 N/mm2)
Loading class, - 400; 600; 900 kN
Applicable on manhole entry of dia. D 800mm (32”); D 36” (915mm); D1000 mm
FRAME Piece - DN.775 - 30.7” Top plane view
- high grade iron construction (350; 400 N/mm2)
Loading class, - 400; 600; 900 kN
Applicable on manhole entry of dia. D 800mm (32”); D 36” (915mm); D1000 mm
Top opening dia. 775 (30-1/2”) {DN. 775}(top inner dia.)Top opening dia. 775 (30-1/2”) {DN. 775}(top inner dia.)
AA AA
Overall dia. D 940 (37”) ; D 1060 (41-3/4”) ; D 1120 (44-1/8”)Overall dia. D 940 (37”) ; D 1060 (41-3/4”) ; D 1120 (44-1/8”)
Top (outer) dia. D 820...825 (32-3/8”) Top (outer) dia. D 820...825 (32-3/8”)
14...16 at end14...16 at end
RibsRibs
r
1
Cleaanc
dia. 710. .718
(2
8”...28-
/4”)
e
.
)
(clear openingr
1
Cleaanc
dia. 710. .718
(2
8”...28-
/4”)
e
.
)
(clear opening
(Applicable on manhole entry of dia. D 800 / 32” ; D 36”/915mm ; D 1000 mm)(Applicable on manhole entry of dia. D 800 / 32” ; D 36”/915mm ; D 1000 mm)
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