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Micro tunneling

MicrotunnelingMicro tunneling is a process that uses a remotely controlled, Micro tunnel boring machine (MTBM) Combined with the pipe jacking technique to directly install product pipelines underground in a single pass, this process avoids the need to have long stretches of open trench for pipe line laying, which causes extreme Disruption to the community. Typical Microtunnel equipment spread consists of an MTBM matched to the expected Sub surface conditions and the pipe diameter to be installed, hydraulic jack system to pipe jacking the pipeline.

Horizontal Directional Drilling

shree rg infraThe HDD method contains impact support and is called the Grundodrill Technique. It enables Trench less Installation Up to 500 m length. The Spectrum of Application includes all Pipe Construction Measures within the bounds of gas, district heating and Drinking Water Supply, the installation of Pressure lines for sewers as well as cable protection pipe for Telephone or television Cables. The HDD Method is Extremely Protective towards the environment and causes no ecological damage at all. The HDD method is advantageous because surfaces worth conserving are neither broken up nor damaged, restoration and Repair are not required, witch leads to high economical advantages.

There are several reasons for the application of the directional technique in central town areas, The mainly concern the construction costs, construction periods, permission Procedures, soil displacement surface restoration and the traffic, compared to open Trenching methods. the normal course taken by the drilling operation Includesplanning , preliminary survey ,selecting the drilling units and drilling tools, pilot bore and detection, back reaming or upsizing bore and pulling in the pipe. To overcome mechanical soil resistance high thrust and tension forces are required. The application of bentonite might relive the pilot bore and the pipe traction and provide the ability to steer in difficult soil qualities.

Jack Pushing

Pipe Jacking

  • The excavator digs up soil and a suitable Drive pit is made.
  • Thrust wall and thrust bed are made by RCC/PCC/Steel frame /Wooden frame.
  • Hydraulic rigs and jacks are lowered.
  • Pipe segments are lowered on the rig.
  • Jacks are fitted to the pipe to the jack holder.
  • The earth is excavated from inside the pipe manually.
  • The pipe is then pushed forward by hydraulic jacks.
  • On completion of jacking of one segment of pipe, the next segment is lowered
    and the operation is again repeated till the pipe reaches other side in the Exit Pit.

Auger Boring

Auger boring is one of the oldest methods of trenchless construction and was in wide use many years before the term “trenchless technology” became popular. Horizontal Auger Boring method is a cost-effective and versatile technique for installing steel casing or product pipes under rail tracks, roads and highways or inner-city.
This is a method of forming a bore, usually from a drive pit, using a rotating cutting head that bores through the soil mass installing sections of pipe as it advances and the process is called Auger Boring Method in Trenchless Technology. Soil is removed back to the Drive pit by helically wound auger flights rotating in a steel casing. The advantages of this trenchless method are that it causes little or no disruption to soil surface and no disruption to traffic. This method has its inherent limitations which include requirement of through soil investigation as large boulders or very soft soil strata can cause serious problems.

Box Pushing

Box Pushing tunnelThis is a method of jacking precast concrete box units through soil mass to form a horizontal opening under Railway/ Road embankments or any existing formations, without disturbing the top amenities.

The technique itself is completely hydraulically controlled and promises a great accuracy of driving. The reaction at the rear face is taken by a Thrust Wall suitably designed. The first box unit is headed by a specially designed steel head termed as “shield” which forms the working face and from this end the soils are manually excavated. The technique has the inherent advantage of being an extremely safe method of working.

This is a method by which large concrete boxes are installed beneath existing railway or highway infrastructure to provide new under bridges with little or no disruption to traffic flows, unlike the traditional cut and cover methods.


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