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MIDAS - Expandable Friction bolt is used for temporary rock reinforcement in underground works.

This rock bolt is made of a welded tube folded on itself and sealed at one end while the other end

is consisting of special head bushing used for inflation. It is expanded using a high-pressure water

pump. The high load bearing capacity combined with excellent elongation properties ensure safer

working conditions and faster excavation cycles for low costs.

​ Installation Procedure

  • Drilling of hole in the rock
  • Insert the Expandable Friction Rock Bolt

  • Inflation of bolt to a set pressure using a high pressure water pump.


Various Capacity :120kN, 160kN, 240kN

Minimum Elongation: 10%, 20%

Delivery Lengths: 1-8 mtr.


Face plates are used to create a local surface support around the bore hole collar area. They are

also utilized to maintain local roof stability, to prevent key block movement and to retain surface

support like mesh.The plates are manufactured from high quality steel and meet or exceed the

properties stated in the individual specification.


Main Advantages of Expandable Friction Rock Bolts

  • Full load bearing capacity over the entire installed bolt length.

  • Ability to maintain load bearing capacity even during underground deformations.

  • Safe & easy installation with no additional building materials is required for installations.


Expandable Rock Bolt Pump

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The excellent equipment of the high pressure bolt pump is a guarantee for durability and low maintenance. In the standard with 14 ltr. Water per minute at 300 bar. On request also with 21 ltr. Water at 300 bar possible. Anchor setting times for 4m anchors are approx. 25 seconds with the pump 300/14, approx. 10 seconds with the  300/40, using the specific accessories (setting gun, setting lance, setting head). Due to its high pressure and water performance, the pump is also suitable for intensive cleaning tasks, e.g. on tunnel boring trucks. On request, the pump can also be supplied in a mobile manner and with a permanently installed hose reel.

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