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Description: C:\Users\cust\Desktop\Sony Data Feb 2018\ATIF\ALPINE STEEL INDUSTRY\LOGOS\IMG-20180227-WA0000.jpg

 

MANHOLE COVERS and GRATINGS

 

 

Description: C:\Users\cust\Desktop\Sony Data Feb 2018\ATIF\ALPINE STEEL INDUSTRY\LOGOS\IMG-20180227-WA0000.jpg has been supplying good quality manhole covers, surface boxes and gully grates to the market for over20 years in the across Pakistan.  The company has been in this light manufacturing since 1990 and which enable us to offer a complete range of covers and gratings, from standard products right through to bespoke special products, designed in house on CAD. We have supplied these products to flagship projects throughout the Pakistan, working with contractors and specifiers to ensure the right product is designed. All iron covers are manufactured to British Standard Specifications - BS EN124:1994 and BS 497. This specification includes loading categories for certain application areas as explained in the undersigned paragraphs.

Our highly knowledgeable staff are on hand to deal with all your requirements and to offer advice and technical backup across the full range of products.

 

 

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Design Load Requirement Table

Loading

BS 497

Grade

BS  497

Test Load

BS EN 124

CLASS

BS EN 124

Test Load

Areas imposing particularly high wheel loads – Group 6,

Airport Taxiways

Ultra Heavy Duty

-

-

F900

900 kN

Areas imposing high wheel loads

 Group 5, Airport Apron

Super Extra Heavy Duty

-

-

E600

600 kN

Carriageways of roads (heavy duty) – Group4, Forklifts, Earth moving eqpts.

Extra Heavy Duty

D

A

400 kN

350 kN

D400

400 kN

Gully tops in kerb side channels of roads – Group 3

Heavy Duty

-

-

C250

250 kN

Footways, no heavy vehicle areas etc.  Group 2

Medium Duty

B

150 kN

B125

125 kN

Areas inaccessible to motor vehicles for pedestrians – Group1

Light Duty

C

10 kN

A15

15 kN

 

“The appropriate class of manhole top or gully top to be used depends upon the place of installation. The selection of the appropriate class is the

responsibility of the designer. Where there is any doubt the stronger class should be selected.”

BS EN124-A 15

Light Duty Grey Iron Single/ Double Seal

BS EN124-B 125

Medium Duty Grey Iron Single/ Double Seal

BS EN124-C 250

Heavy Duty Grey Iron Single/ Double Seal

BS EN124-D 400

Extra Heavy Duty Grey Iron Single/ Double Seal

 

 

 

FITTING INSTRUCTIONS:

 

General.

1. Covers and frames are manufactured as a unit – ensure that corresponding covers and frames match and fit correctly before commencing installation.

2. The frame of an access cover must be fully supported . Any load placed onto the access cover is transferred to the structural opening via the frame. If the frame is only partially supported,

 the unit will not carry the load it is designed for and will ultimately fail . – please see sketches below.

3. Recessed covers (excluding paving infill) must be fully infilled with grade C25 concrete , by volume, 1 cement, 2 sand, 3 coarse aggregate ( 9.5 to 3mm), to achieve their stated loading capacity.

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Single unit covers.

1.     Place empty frame ( cover and frame with hinged units ) around the chamber, centralizing it to the structural opening. Pack up the frame to the required level with suitable hard packing material, such as tile.

Care must be taken to ensure the frame does not over hang the opening. If the frame is provided with fixing pads, these must be used to bolt the frame to the sub-floor.

2. Fill the unsupported areas of the frame with suitable grouting material. The underside of the frame must be fully supported. Allow grout to fully harden.