Manholes

Cement concrete structures corrode in H2S environments. So why install a corrodible manhole in a system that is deemed corrosive? Simply stated, with polymer concrete, you get completely inert structures. Now the industry has a solution to break the cycle of corrosion. No more band-aid coatings or liners.

Manhole Classifications:

Manholes and inspection chambers are mainly classified are as follows

  1. Inspection Chambers
  2. Type 1 manholes
  3. Type 2 manholes
  4. Type 3 manholes

Inspection chambers:

S/NID No.Manhole DIA (mm)Pipeline DIA (mm)Depth range (m)
1T1-0.6600Up to 2001.5
2T1-0.8800Up to 2001.85
3T1-1.01000Up to 2003

Type 1 Manholes:

S/NID No.Manhole DIA (mm)Pipeline DIA (mm)Depth range (m)
1T1-1.21200Up to 4004
2T1-1.51500Up to 4005
3T1-1.81800Up to 9005
4T1-2.02000Up to 10006
5T1-2.22200Up to 14006
6T1-2.42400Up to 16006.5
7T1-2.82400Up to 20008

Type 2 manholes:

S/NID No.Manhole DIA (mm)Pipeline DIA (mm)Depth range (m)
1T2-1.51500Up to 50020
2T2-1.81800Up to 90010
3T2-2.02000Up to 100011
4T2-2.12100Up to 140010
5T2-2.22200Up to 140010
6T2-2.42400Up to 160011
7T2-2.82800Up to 200012

Type 3 manholes:

S/NID No.Manhole DIA (mm)Pipeline DIA (mm)Depth range (m)
1T3-1.81800Up to 90020
2T3-2.12100Up to 140020
3T3-2.22200Up to 140015
4T3-2.42400Up to 160019
5T3-2.82800Up to 200025

Type 4 manholes:

S/NID No.Manhole DIA (mm)Pipeline DIA (mm)Depth range (m)
1T4-2.12100Up to 140030

Manhole Units:

Types of units are described as follows

  1. Height adjusting unit or compensation unit: – Used to adjust the manhole height up to the ground level. Also can be designed as per DI cover design
  2. Cover slab: – The cover slab shall be generally with 600mm opening for all manholes.
  3. Chamber Ring or shaft ring: – Chamber ring shall be of various diameter and heights as per design.
  4. Reducing slab or Adaptor plate: – Used to reduce the shaft diameter of type 2 and type 3 manholes.
  5. Base slab: – Base slab holds the total weight of manhole including traffic load, and it will varies with diameter and thickness as per design

Joint Configuration Properties of Polymer Concrete Manholes and chambers:

Leak-tightness of manholes and their joints tested as per BS EN 14636-2

Exfiltration:

Withstands an internal pressure of 1 bar for 15 minutes without any sign of leakage, damp patches or water droplets.

Infiltration:

Withstands an internal negative pressure of 0.8 bar for 15 minutes without any damage to its components nor exhibit specified change in pressure.

Properties of polymer mortars

Polymer mortar contains high amount of resin which gives great adhesive property.

  1. Density – 15.7 KN/ m^3
  2. Compatibility – Compatible to bind between polymer concrete, GRP ,uPVC ,Clay and Concrete pipes

Advantages of polymer concrete manholes:

  1. Rapid curing at ambient temperatures.
  2. High tensile, flexural, and compressive strengths.
  3. Good adhesion to most surfaces like any pipe connections.
  4. Good long-term durability with respect to freeze and thaw cycles.
  5. Low permeability to water and aggressive solutions.
  6. Good resistance against corrosion.
  7. Adaptable for quick and easy installation methods.
  8. Compatible for many possible modification with less effort.

Applications:

  1. Sewer system both urban and industrial
  2. Pumping stations
  3. Industrial waste
  4. Seashores
  5. House connection chambers
QGPC | Range of Manholes

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