DYWI^® Drill Hollow Bar

Introduction

DYWI^® Drill Hollow Bar is a fully threaded self-drilling system installed into loose or collapsing soils without the need for casing. The bar features a hollow bore which enables it to be simultaneously drilled and grouted. The hollow bar incorporates a left-hand thread for standard rotary percussive drilling.

Manufactured from high grade steel tubing to EN 10083-1, DYWI^® Drill Hollow Bar is cold rolled to form standard rope thread or “T” thread profiles. The DYWI^® Drill rolling process refines the grain structure of the steel, increasing the yield strength and producing a robust drill steel suitable for a range of drilling and grouting applications.

The DYWI^® Drill Hollow Bar System includes a full range of drill bits, adaptor sleeves, couplers, nuts and bearing plates. In addition, the range of DYWI^® Drill injection adaptors and drill tooling enables the hollow bar to be used with a wide range of drilling equipment.

Key Features

• European Technical Approval
  • The DYWI^® Drill Hollow Bar System has a full European Technical Approval covering all bars and accessories ETA-12/0603
• Manufactured in Europe
  • DYWI^® Hollow Bars are produced in a specialist facility in Pasching, Austria
• No Casing Required
  • Bars can be drilled into loose or collapsing soils without the need for a casing to support the borehole.
• Fully Threaded Rod Sections
  • Continuous thread ensures that rods can be cut and coupled at any point, or extended.
• Simultaneous Drill and Grout Installation
  • Grout is injected at all points of the borehole as drilling is advanced, permeating the local strata for increased bond performance and producing bulbing in softer sections of the soil.
• Rotary Percussive Drilling
  • This drilling technique is highly efficient, ensures good directional stability of the drill string and helps to consolidate the grout within the borehole.
• High Strength Threads
  • Both the Rope threads and “T” threads provide a strong and robust thread ensuring a high level of bond with the borehole grout.
• Self-Drilling System
  • The self-drilling function enables bars to be drilled into most ground conditions for both tension or compression applications, and is also used as an injection conduit.
• Left-Hand Thread