This document discusses ground support systems for underground mining, including support profiles, rock bolt straps, and accessories. It describes the main advantages of support profiles like TH, HEB, and UNP profiles which are used as passive ground control elements. Rock bolt straps and mats are used in combination with rock bolts to secure excavated surfaces, with straps preferred in hard rock and mats in soft rock. The document provides specifications for the different support profile types and rock bolt straps.

1. Support Profiles and Rock Bolt Straps

2. 2

3. Introduction .................................................................................................................. 3
Fields of Application ...................................................................................................... 4
Main Advantages ........................................................................................................... 4
System Description ...................................................................................................... 4
Specifications. .............................................................................................................. 5
Accessories .................................................................................................................. 6
TH Profiles, HEB Profiles, and UNP
Profiles are successfully used as passive
ground control elements in underground
construction.
Although the importance of conventional
steel support has recently decreased,
it is still successfully used in deep-level
underground coal mining as well as
for special supporting constructions in
Tunneling and cavern construction.
Rock bolt straps and mats are used in
combination with rock bolts for securing
the excavation surface. In hard rock
Mining, rock bolt straps are preferably
used, whereas soft rock and coal Mining
prefer flexible rock bolt mats or mesh.
Contents
Introduction
3

4. ■■ Ground support in Underground
Mining
■■ Shaft construction support
■■ Support of junctions and cross-
sections
■■ Rock bolt mats and straps for
connecting individual rock bolts
■■ Flexible adaptation of the beam
geometry to the respective excavated
cross-section
■■ Well-proven passive mine support
■■ Flexible extension by using yielding
locks
■■ Large-scale profile cross-sections
ensure longer life times
■■ Mine support steel 31Mn4 according to
DIN 21544
■■ Bent to the corresponding profile
■■ Single overlapping segments are usually
connected by two locks
■■ Alternative TH locks are available
on request
■■ I Profile – HEB broad flange girder
■■ Primary material S235JRG2 or
S355J2G3 according to EN 10025-2
■■ Bent to the corresponding profile
■■ Connection of the segments via head
plates that are available in different
designs
■■ Alternative connection of the abutting
segments via laces
■■ Different lace types and lace screws
are available on request
■■ U Profile with inclined inner surfaces
of the flanges
■■ Primary material S235JRG2 or
S355J2G3 according to EN 10025-2
■■ Bent to the corresponding profile
■■ Connection of the segments via
welded-on and screwed head plates
or flange connections
■■ Different lace types and lace screws
are available on request
■■ Connection of single bolts
Fields of Application
System Description
Main Advantages
TH Profile
HEB Profile
UNP Profile
Rock Bolt Straps
4

5. Support Profiles
TH Profile
HEB Profile
UNP Profile
Specifications
Type/characteristic
value
Symbol Unit TH 21 TH 25 TH 29 TH 36
Weight m [kg/m] 21 25 29 36
Profile height H [mm] 108 118 124 138
Profile width B [mm] 124 135 151 171
Neutral axis e [mm] 52 58 58 69
Section modulus Wx [cm³] 61 80 94 136
Type/characteristic
value
Symbol Unit UNP 80 UNP 100 UNP 120 UNP 140 UNP 160
Weight m [kg/m] 8.9 10.9 13.7 16.4 19.3
Profile height H [mm] 80 100 120 140 160
Profile width B [mm] 45 50 55 60 65
Neutral axis e [cm] 1.45 1.55 1.60 1.75 1.84
Section modulus Wy [cm³] 6.4 8.5 11.1 14.8 18.3
Type/characteristic
value
Symbol Unit HEB 100 HEB 120 HEB 140
Weight m [kg/m] 20.9 27.4 34.5
Profile height H [mm] 100 120 140
Profile width B [mm] 100 120 140
Section modulus Wx [cm³] 89.9 144 216
5

6. ■■ Alternative profile types and
connection elements are available
on request
■■ Screws, nuts, and bolts are available
in different designs
■■ Rock bolt tension straps and
underpinnings
■■ GRP mesh and rock bolt straps
Accessories
Specifications
Rock Bolt Straps
OSRO straps 1)
W-straps 1)
Length
[mm]
Width
[mm]
Horizontal bar
diameter
[mm]
Strapping bar
diameter
[mm]
1,000 - 6,000 250 - 1,000 6 - 10 5.5
Length
[mm]
Width
[mm]
Wall thickness
[mm]
Hole spacing
[mm]
1,000 - 3,.000 220 - 500 1.5 - 6.0 500
1) Alternative dimensions available on request
6

7. 7

8. 04349-1/02.13-webhe
Please note:
This brochure serves basic information
purposes only. Technical data and information
provided herein shall be considered
non-binding and may be subject to change
without notice. We do not assume any liability
for losses or damages attributed to the use
of this technical data and any improper
use of our products. Should you require
further information on particular products,
please do not hesitate to contact us.
"ALWAG" (AM 952/79), "AT" (AM 6138/2003),
"AT-SYSTEM” (AM 6139/2003),
"DYWI®" (4197869), "LSC" (AM 4326/2008),
"OMEGA-BOLT®" (3258282),
"POWER SET" (AM 6163/2002), and
"TUBESPILE" (AM 4328/2008) are registered
trademarks of DYWIDAG-Systems International GmbH.
"Combi Coat®" and "CT-Bolt" are trademarks
of Vik Ørsta AS.
DYWIDAG-Systems International GmbH
is a partner of Vik Ørsta AS.
DSI Austria
DYWIDAG-Systems International GmbH
Alfred-Wagner-Strasse 1
4061 Pasching/Linz, Austria
Phone +43-7229-610 49 0
Fax +43-7229-610 49 80
E-mail alwag@dywidag-systems.at
www.alwag.com
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