Our company has succeeded to achieve respectable position in the market as a trusted manufacturer and supplier of GT Manhole Covers. To manufacture these covers, our expert workforce uses quality grade materials. These covers are mainly used as a lid to cover the manhole in streets. Clients can avail these GT Manhole Covers from us in different sizes and finishing as per their requirements. We offer this cover at reasonable prices to clients.
Features:
Further Details:
The Precast concrete manhole covers & frames were introduced to the construction industries due to the necessity of suitable alternative to cast iron manhole covers & frames. The cost of cast iron is increasing day by day and cast iron manhole covers are prone to pilferage and misuse since they possess a high resale value, causing financial loss due to the need for replacement of stolen covers, accidents due to the open manholes and other environmental problems. Precast manhole covers & frames are found to satisfy the basic requirements and are also found to be economical substitute to cast iron manhole covers & frames, and these concrete cover & frame are gaining fast popularity and are being used everywhere in sewerage and water works.
Merits of precast concrete manhole cover / Frame over CI cover / Frame.
Characteristics |
C I Covers |
Precast Concrete Covers |
Durability |
Brittle |
Highly Durable |
Strength |
Equal |
Equal |
Susceptibility to Thefts |
High |
Nil |
Scrap Value |
High |
Very Low |
Cost |
100 % |
40 % |
Grade and Types
Manhole Covers and frames shall be of the following four grades and types:
Grade |
Grade Designation |
Type/Shape of Cover |
Light Duty |
LD-2.5 |
Rectangular, Square, Circular |
Medium Duty |
MD-10 |
Rectangular, Square, and Circular |
Heavy Duty |
HD-20 |
Rectangular (Scrapper Manhole), Square, Circular and Lamphole |
Extra Heavy Duty |
EHD-35 |
Rectangular (Scrapper Manhole), Square and Circular |
Recommended Locations for Placement :
Material
The raw materials are being used in manufacture of Precast Concrete Manhole cover and frame are according to the specification of IS v12592 : 2002.
Manufacture :
Finishing
The maximum load which the manhole cover withstands without fracture for a minimum period of 30 seconds is reported as the breaking load.
The breaking load of individual covers when tested is not less than the values specified in Table.
Grade of Cover |
Type |
Diameter of Block (mm) |
Load (kN) |
EHD-35 |
Rectangular, square of circular |
300 mm |
350 |
HD-20 |
Rectangular, square of circular |
300 mm |
200 |
MD-10 |
Rectangular, of circular |
300 mm |
100 |
LD-2.5 |
Rectangular, square of circular |
300 mm |
25 |
All the tests are conducted on samples of covers and frames are confirming to IS 12592 : 2002, The number of covers and frames required for the test are taken at random basis.
Sampling Nad Inspection
For the conformity of the materials in the lot to the requirements of this specification, samples are tested from each lot separately. The number of cover and frames to be selected from the lot are depend on the size of the lot and are according to given table.
No. of Covers or Frame in the lot |
Dimensional Requirements |
No. of samples for load Test on cover only |
|
Sample size |
Acceptance Number |
||
Up to 100 |
10 |
1 |
2 |
101 to 200 |
15 |
1 |
3 |
201 to 300 |
20 |
2 |
4 |
301 to 500 |
30 |
3 |
5 |
The number of covers and frames with dimensions outside the tolerance limit and or with visual defects among those inspected shall be less than or equal to the corresponding acceptance number given in column 3 of table.
Product Range :
Product Description |
Grade Designation |
Shape |
Clear Opening in Frame |
Frame Size |
Cover Size |
||||
B |
C |
D |
E |
Thickness |
Diameter of Cover |
||||
Light Duty |
LD-2.5 |
Square |
450 x 450 |
50 |
50 |
50 |
50 |
50 |
566 |
Light Duty |
LD-2.5 |
Rectangular |
450 x 600 |
50 |
50 |
50 |
50 |
50 |
570 x 720 |
Light Duty |
LD-2.5 |
Circular |
450 |
50 |
50 |
50 |
50 |
50 |
566 |
Light Duty |
LD-2.5 |
Circular |
560 |
50 |
50 |
50 |
50 |
50 |
676 |
Medium Duty |
MD-10 |
Square |
600 x 600 |
70 |
50 |
50 |
50 |
70 |
720 x 720 |
Medium Duty |
MD-10 |
Rectangular |
450 x 600 |
70 |
50 |
50 |
50 |
70 |
570 x 720 |
Medium Duty |
MD-10 |
Circular |
500 |
70 |
50 |
50 |
50 |
70 |
620 |
Medium Duty |
MD-10 |
Circular |
560 |
70 |
50 |
50 |
50 |
70 |
680 |
Medium Duty |
MD-10 |
Circular |
600 |
70 |
50 |
50 |
50 |
70 |
720 |
Heavy Duty |
HD-20 |
Square |
560 x 560 |
90 |
50 |
50 |
50 |
90 |
740 x 740 |
Heavy Duty |
HD-20 |
Rectangular |
450 x 900 |
90 |
75 |
75 |
75 |
90 |
630 x 1080 |
Heavy Duty |
HD-20 |
Circular |
500 |
90 |
75 |
75 |
75 |
90 |
680 |
Heavy Duty |
HD-20 |
Circular |
560 |
90 |
75 |
75 |
75 |
90 |
740 |
Heavy Duty |
HD-20 |
Circular |
600 |
90 |
75 |
75 |
75 |
90 |
780 |
Extra Heavy Duty |
EHD-35 |
Circular |
560 |
100 |
75 |
75 |
75 |
100 |
738 |
Extra Heavy Duty |
EHD-35 |
Circular |
600 |
100 |
75 |
75 |
75 |
100 |
778 |
All Above Precast Concrete Cover can also be provided with suitable hole as per customer requirement for rain water drainage |
Note :