ROBIT ® FOREPOLING PRODUCT CATALOGUE ROBIT ® FOREPOLING PRODUCT CATALOGUE RoX+ 76,1 systems RoX+ 88,9 systems RoX+ 101,6 systems RoX+ 114,3 systems RoX 139,7 systems RoX+ 168,3 systems RoX+ GFRP 76,1 systems

ROBIT® FOREPOLING PRODUCT CATALOGUE Copyright © 2015, Robit Rocktools Ltd All rights reserved. No part of this catalogue may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher. Trademarks Robit is a trademark of Robit Rocktools Ltd. Publisher Robit Rocktools Ltd. www.robit.fi Printed: March 2015 Robit reserves all rights to any changes in the products and the specifications without prior notice.

Contents ROBIT® FOREPOLING APPLICATION ROBIT® FOREPOLING WORKFLOW ROBIT® FOREPOLING PRODUCTS ROBIT® PATENTED SPIRAL LOCKING SYSTEM ROBIT® DIMENSIONS EXPLANATION ROBIT® RoX GFRP IN BRIEF ROBIT® FOREPOLING DRILLING SYSTEMS ROBIT® PRODUCT CODES & PART NUMBERS: RoX+ ROBIT® PRODUCT CODES & PART NUMBERS: RoX+ GFRP ROBIT® RODS ROBIT® DRILL TUBES

Robit® Forepoling Application

Forepoling Forepoling, also known as tube umbrella, is an application used to strengthen tunnel roof in broken rock conditions. Drilling system consists of casing tubes which are drilled through the overburden as an umbrella and filled with grouting. Robit® Casing System allows easy driving of the casing tubes into the ground with low torque demand. In modern forepoling also fibreglass casings can be used for ultra-long facebolts. Robit® Casing Systems mostly used in forepoling are RoX+ 88,9/8, RoX 114,3/10 and RoX 139,7/10.

CASING SHOE CASING/DRILL TUBE DRILL ROD GROUTING HOLES - ø 12 mm

STARTER CASINGS Casing tubes • • • • Typically one pile consist of several steel casings of 1,5 – 3 meters Connection by thread Injection valves for grouting Standard casing diameters: 88,9 - 114,3 - 139,7 - 168,3 mm Preparation CASINGS, DRILL TUBES Robit® Ring Assembly is factory welded to the first casing (starter casing) by casing shoe Welding norm: - EN499: E42 6B 42 H5 - AWS/ASME: SFA – 5.1/ E7018-1 - DIN8529: ESY 42 76 Mn B Required Equipment • • • • Almost any drill rig with standardized equipment can be used to drill tube umbrella Jumbo drill is commonly used A basket boom installed for...

Typical design • • • • 20-40 casing tubes per advance Each pile 15 meters long, which gives about 12 meter tunnel advancement Tubes are inclined 3-5 degrees from tunnel advance direction Casing size and other specifications are determined by qualified tunnel engineers and geologists based on the soil conditions Tubes Steel frames Cross section of single pipe forep

Single pipe forepoling

Robit® Forepoling Workflow At the jobsite all tools must be stored in clean and safe place. No damages for casings or dirt for threads is allowed. Robit® delivers full package of forepoling tools for drilling: pilots, ring bits, tubes, starter casings, drill rods, grouting plugs & shanks. 1 Threads must be inspected and if necessary greased before lifting them to jumbo’s basket (you may check thread connection by using e.g. grouting plug’s female end) Thread the pilot to the extension r

Prepare a set of starter casing extension rod inside (threads well greased) and lift to the basket. Wash/clean jumbo’s feed and boom from dirt. 5 Connect the extension rod to the shank. Drive the set of pilot & rod until the ring bit assembly and lock it by rotating it counterclockwise.

Press the front support firmly against the rock before drilling. Collar the rock surface softly with the pilot until the casing assembly has drilled few centimeters - after that start rotation. Increase drill parameters step by step. When the starter casing has been fully installed, unlock the pilot by rotating clockwise and perform sufficient flushing while moving pilot in/out of the casing. Repeat this step after every casing has been installed. 9 Lock the pilot again to the ring assembly, disconnect the shank from extension rod and pull it out . Install a new set of extension casing and extension...

Connect the extension rod to the shank. When the last pile of the arc has been installed... 13 14 15 16 Install the grouting plug (end cap) to the casing and inject the soil using cement or polyurethane grout. ... it’s time to pick up grouting tools.

If the tunnel face has been stabilized with Robit® RoX GFRP (fiberglass tubes) system with injected grout, it’s easy to demolish for example with an excavator. Reinforce ceiling, install steel frames and shotcrete tunnel face. Separate fiberglass from the excavated soil and recycle it. 17 18 19 20 Start a new section by supporting the tunnel face with Robit® RoX GFRP system

Robit® Forepoling Products

. Pilot Bits . Ring Assemblies . Drill Rods . Starter Casings . Extension Casings . Grouting Plugs (end caps) . Adapters . Grouting Valves . Forepoling Drilling Systems

Robit® Patented Spiral Locking System Automatic spiral locking (Patented): 1.) Drive the pilot bit through the casing tube 2.) Rotate to locked position in the ring bit 3.) Robit® Casing System is READY TO DRILL 4.) Finish drilling by rotating the pilot bit in opposite direction and pulling it out

Robit® Dimensions Explanation Casing System dimensions Top Hammer Pilot bit Wall thickness Outer diameter of pilot bit Outer diameter (OD) Outer diameter

Robit® RoX in Brief: system parts Single-use system for top hammer drilling Robit® Single Casing Systems can be used with traditional top hammer machinery. Typically Robit® Single-Use system for Top Hammer is used in applications with relatively short hole requirement 12-15 m and where the casing is left in the ground, such as: • • • forepoling or tube umbrella anchoring micropiling Drilling parameters example: Jumbo drill RoX+ 139,7/10 Product Rock / Ground conditions All rock and ground formations Application Tube Umbrella, Forepoling Top hammer thread C45 Rotation speed 30 - 40 RPM Torque...