This document proposes a private standard for the dimensions of a specialized cast iron manhole cover. It specifies the main dimensions, including an overall diameter of 770mm for the lid piece, a top opening diameter of the frame of 775mm, and an inner opening diameter of the frame ranging from 825 to 1000mm to fit various manhole sizes. Reinforcing ribs are included in the lid and frame designs. The proposed standard aims to specify dimensions for this specialized manhole cover product in concordance with regional standards like EN124, and could take the form of a pre-standard, product standard, technical specification, or other standard type according to terminology in EN45020:2006 or ISO/IEC 2:2004.
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Comment optimiser l'utilisation de votre portail Nomination ?
Découvrez 3 exemples d'usage pour :
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DN775 - Grey Cast Iron Manhole Cover - 400 kN
1. A PROPOSAL ON THE SUBJECT OF PRIVATE STANDARDIZATION
THE SUBJECT OF PRIVATE STANDARD DEVELOPMENT
Date of proposal:
Secretariat of Organization
TCs
WGs
Author 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).
2.
3.
4. DN.770 - Lid Piece of D.770/775
Backside view - 4 vent holes design -
- Loading class, - 400; 600; 900 kN
MDER
690
CMDMR
CMDCR
155
( 27-1/8”)
425
( 16-3/4”)
( 6-1/8”)
Radial
reinforcing
rib
in between
holes centres
A
270 ( 10-5/8”)
Perimetral
reinforcing rib
A
R-4
14;15;16
( 5/8”)
Intermediate
circular
reinforcing rib
R-4
(5/32”)
round
edge
Overall dia.
Central circular
reinforcing rib
O 770
( 30-5/16”)
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
5.
6. LIP Piece - DN.775 - 30.70”
Backside view
In concordance with
vertical section A - A
of conical lid plate structure
Conical Lid plate design
(multiple frustum of cones)
4 vent / pick holes
at 90 degree
A
75...80
A
Reinforcing
block
Outer
lower
part
Rib centre axe dia. 690
OD (overall dia.)
Hole
clearance
detail
32
R32 R 13.5
42
770
( 27-1/8”)
( 30-5/16”)
7.
8. 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.
(top inner dia.)
A
775 (30-1/2”)
{DN. 775}
”)
1/4
8..2
.
8”
(2
A
8
.71
0..
71
.
dia g )
ce in
a n pe n
r
ea o
Cl lear
(c
14...16
at end
Ribs
Top (outer) dia. D 820...825 (32-3/8”)
Overall dia. D 940 (37”) ; D 1060 (41-3/4”) ; D 1120 (44-1/8”)
(Applicable on manhole entry of dia. D 800 / 32” ; D 36”/915mm ; D 1000 mm)
