PRECAST CABLE TRENCHES
LAYING CABLES WITH A TECHNOLOGY THAT’S ABLE
Cable trenches are available in wide range of sizes starting from 600mm to 1500mm in width and 600mm to 1500mm in height. These trenches can be used for indoor and outdoor applications. They come with cover slabs, which are designed for various load conditions.
These are factory made, casted in a closed environment, having superior quality and well suited for fast paced construction.
Standard Cover Slab thickness
Medium Duty : 50mm
Heavy Duty : 170mm
MATERIAL SPECIFICATION
Concrete : Grade 40 to Grade 45
Steel : Fe500
Nominal cover : 25mm
REQUIREMENTS
Density of backfill soil should be minimum18 Kn/m3
Backfill material adjacent to side wall should be of granular type
Backfilling and compaction to be performed layer by layer alternatively on
DESIGN CRITERIA
Structural design of the Cable Trenches are in accordance to:
BS 5400 : Part 4 : 1990 | BD 31/01 | MS 1293 : Part 1 : 1992
IRC 6 – Cl 214.1.1.3 | IS 456 : 2000
LOADS:
The thicknesses of side walls, base slab and cover slabs of these drains are dependent on the type of loading coming on to the drains.
Three variants are – Light Duty, Medium Duty and Heavy duty.
Light duty
Light duty means, the drain is designed only for lateral Earth Pressure and a Live Load of 150 Kg/Sqm. Cover slab on top of these drains will also be of light duty in nature because only human load will be on top and there cannot be movement of any loads more than 150 Kg/Sqm.
Medium duty
Medium duty means the drain is designed for lateral Earth pressure, Live Load Surcharge (for an equivalent height of 1.2 m earth fill) and vehicular traffic will be passing by adjacent to the drain wall. Here again, the cover slabs will be of light duty, as there can be only human traffic over it and no vehicles will be passing.
Heavy duty
Heavy duty drain means, the drain is designed for lateral Earth pressure, Live Load Surcharge (for an equivalent height of 1.2 m earth fill) and heavy Vehicles over the drain. Here the cover slabs on the drain top will be of heavy duty, as it has to take the load of Heavy Vehicles.
In cable trenches, it is important that water should not get stagnated inside, which is very much possible in conventional trenches. In precast trenches, since there will be no joints, the chance of water permeating is not possible. For additional protection, it is better to put a layer of HDPE sheet and then the trench can be erected. This is required in sensitive applications. In open areas, where rain water can enter through the cover slabs, the water has to be drained out properly.
Cable trays can be fixed on the drain walls by fixing Hilti anchors. Line and level can be got easily.