Types of Prestressed Concrete Pipes and Their Uses

We realized that pipes are utilized to ship gas or fluid substance starting with one spot then onto the next spot. 

Various types of pipes, for example, steel pipe, PVC, uPVC, and RCC pipes are utilized in water transportation and PSC (Prestressed Concrete Pipe) pipe is one among them. The choice of line depends on the reason, area, functionality, and required strength. 

The prestressed concrete pipes (PSC) use developed lately and supplanted the regular pipes, for example, RCC pipe, Steel pipe dependent on both strength and cost. 

Types of prestressed concrete pipes

Types of prestressed concrete pipes 

Prestressed concrete pipes are arranged into two unique types as follows: 

  • Prestressed Concrete Lined Cylinder Pipes 
  • Prestressed Concrete Non-cylinder Pipes 

1. Prestressed Concrete Lined Cylinder Pipes 

In this sort of Prestressed Concrete Pipes, the concrete center line is lined by a steel cylinder which is wrapped with a helix of profoundly prestressed wire and this wire game plan is secured by a layer of concrete mortar or thick concrete. Steel cylinder contains steel joint rings at its closures which are utilized to associate two pipes during establishment. 

2. Prestressed Concrete Non-cylinder Pipes 

Prestressed Concrete Non-cylinder Pipes doesn’t contain steel cylinders between prestressed wiring and the concrete center line and this is the lone distinction among cylinder and non-cylinder type pipes. In this sort round prestressing is straightforwardly given on the concrete center line. 

Assembling Methods of Prestressed Concrete Pipes 

Prestressed concrete pipes can made in two distinct manners which are 

  • Monolyte Construction 
  • Two Stage Construction 

1. Monolyte Construction 

Monolyte strategy for prestressed concrete pipes making comprises a vertical steel form which has an inward shell and external shell. 

External shell of shape comprises longitudinal areas which are held together by sprint plans. Internal shell of the form comprises an expandable elastic film. 

In this technique, concrete is poured from the highest point of the form under high recurrence vibration. 

When the concrete is poured, the longitudinal areas of the external shell licenses the shape to grow and the elastic layer in the internal shell additionally begins extending. 

Also read: Principles of Building Planning

This presents prestress in concrete and relieving is finished by steaming in monolyte strategy. 

In monolyte construction, the entire creation measure is done in a solitary stage or cycle. 

2. Two Stage Construction 

Two stage construction of prestressed concrete pipes, contains two stages of making and this strategy can be utilized to make both cylinder and non-cylinder type pipes. 

To fabricate Non-cylinder type P.S.C pipe, concrete is projected over a tensioned longitudinal support in the primary stage. 

In the wake of relieving of concrete, in the second stage, prestressed wires are twisted around the boundary of the concrete line under pressure and a concrete mortar layer is covered on it. 

Longitudinal burdens actuated in the first stage are useful in the second stage to oppose breaking because of circumferential winding and breaking during establishment of pipes. 

If there should arise an occurrence of cylinder type pipes, the steel cylinder is lined with concrete within and this cylinder is wrapped utilizing profoundly focused wire. 

In the wake of wrapping the wire, a rich concrete mortar is covered as an assurance layer. 

The wires and the grafts are fixed at close by utilizing rounded clasp. 

For exceptionally high pressing factors, bigger breadth pipes are utilized which may require twofold twisting of wires and twofold mortar covering. 

Uses of PSC pipes 

The PSC pipes are significantly utilized for water transportation frameworks where a high pressing factor of water is provided. 

The PSC pipes can support a high pressing factor of water stream so it is fundamentally utilized in drinking water and lift water system frameworks. 

  • Utilized in the gravity sewer framework 
  • Utilized in sewage water removal rather than stoneware pipe. 
  • Utilized in mechanical sewage removal 
  • Utilized as a duct in the street because of its high strength. 
  • Points of interest of prestressed concrete pipes 
  • It is prudent contrasted with different types of pipes. 
  • PSC pipes are exceptionally hard so ordinary refilling is adequate. 
  • No unique apparatus or devices needed for establishment. 
  • The upkeep cost is low. 
  • The laying strategy is straightforward and doesn’t need exceptionally talented labor. 
  • It is impermeable so it doesn’t influence the groundwater. 
  • The line laying work can be finished quick because of its simplicity of functionality. 

FAQ on Prestressed Concrete Pipes

What is a PSC Pipe or Prestressed Concrete Pipe? 

Prestressed Concrete Pipes are ordinarily utilized with an enormous width pipe fabricated by concrete and the high malleable steel wire which is helically positioned around the concrete center under explicit pressure that invigorates elastic lines. 

The concrete is solid against pressure power and frail against strain power so steel is put around the concrete center to make it solid against both pressure and strain power.

IS code for PSC 

The assembling detail of prestressed concrete lines has been referenced in IS code 784. The choice of the correct material for assembling and quality, strength testing technique likewise indicated in that. 

Which evaluation of concrete is utilized in strengthened concrete pipes? 

The evaluation of concrete relies upon the strength needed for the particular work and M15 is the base evaluation of concrete utilized for assembling the strengthened concrete line. 

Pipe design

Mechanical calculation

The pipes are dimensioned with the procedure developed in the Instruction of the Eduardo Torroja Institute for reinforced or prestressed concrete pipes of September 2007 and which takes into account the following hypotheses:

  • Tube type: Post-tensioned or reinforced concrete
  • Calculation instruction: Torroja.
  • Inner diameter in mm
  • Type of placement: Ditch, common in irrigated areas.
  • Seat bed type: Granular at 90º, usual with elastic joint and irrigation.
  • Compacted fill.
  • Backfill height: 1 to 3 m above the upper generatrix of the tube (it may be higher).
  • Traffic overload: 13 t axle (typical traffic load if not indicated otherwise).
  • Nominal pressure (PN): 5-7.5-10-12.5-15-17.5-20 atm. The usual ones in irrigation.

Hydraulic calculation

The use of the Darcy-Weisbach formula for conduction pressure drops is always recommended.

The value of K (Colebrook) for reinforced or post-tensioned concrete pressure pipes with a sheet metal jacket is normally of the order of 0.03 mm. In order to consider other factors, such as joints, alignment changes, etc., in normal networks it is advisable to adopt the global value of K = 0.1 to 0.2 mm. Lower values ​​of the roughness coefficient for large diameters are not advisable in any type of material, insisting that the value of this coefficient is influenced more by additional factors (joints, etc.) than by the roughness of the tube itself.

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