GB2244072A

GB2244072A - Mine roadway support

Info

Publication number: GB2244072A
Application number: GB9108301A
Authority: GB
Inventors: Linsingen-Heintzmann Peter Von
Original assignee: LINSINGEN HEINTZMANN VON
Current assignee: LINSINGEN HEINTZMANN VON
Priority date: 1990-05-15
Filing date: 1991-04-18
Publication date: 1991-11-20
Also published as: GB9108301D0; DE4015585C1

Abstract

A mine roadway support, comprises a series of interconnectable supporting arches (1) arrayed along the length of the roadway and assembled in the arch direction from rolled steel segments (2, 3) with local overlapping zones (Ü). The rolled steel segments (2, 3) have a profile cross-section comprising a trough zone (21, 31) bordered by two narrower edging troughs (22, 32) open to the opposite face from the trough zone (21, 31). The arches (1) are assembled from outer rolled steel segments (2) disposed with the backs of the trough zones (21) facing the rock, together with inner rolled steel segments (3) disposed with the backs of the trough zones (31) facing the roadway, but leaving a yielding gap (A). The backs of the edging troughs (22, 32) of the inner rolled steel segments (3) run yieldably in the trough zones (21) of the outer rolled steel segments (2). <IMAGE>

Description

-2 2.4 _11; 0 1 - MINE ROADWAY SUPPORT The invention relates to a roadway

support, more particularly for underground mine workings, having a series of interconnectable supporting arches arrayed along the length of the roadway and assembled in the arch- direction from rolled steel segments with local overlapping zones, the rolled steel segments having a profile cross-section comprising a trough zone bordered by two narrower edging troughs open to the opposite face from the trough zone. The expression "roadway" also covers a tunnel, gallery, gate road etc for the purpose of the invention. The supporting arches can be of the more or less inverted U-shape or complete rings. It is selfevident that a back-filling is usually provided between the supporting arches and the rock-face, in the form of backfilling concrete, mortar or the like.

In the roadway support to which the invention relates (DE-PS 30 32 521), all the rolled steel segments have the same profile, comprising an arcuate trough zone and arcuate edging troughs. The edging troughs simultaneously act as Positive locking features for the longitudinal interconnections, being in the way commonly adopted with corrugated iron sheeting. The backs of the trough zones face the roadway and the trough floor carries transvese beading. It is self-evident that adjacent supporting arches are attached to each other by fixing means. The latter can be simple bolts or components acting simultaneously as rock-face anchors. The intention is to assemble a closed supporting system extending along the overlapped between one supporting arch and the next length of the roadway. No provision is made for yielding in relation to the roadway cross-section. Telescopic yielding in the overlaps would be obstructed-by the transverse beading. In the absence of yieldability, the load carrying capacity of the known roadway support is primarily a stability problem. Consequently, correspondingly robust rolled steel segments are required.

The object of the invention is to provide a roadway support of the basic structure already described with means to sustain yielding, and to attain an outstandingly high load carrying capacity, immune from serious stability problems, whilst minimising the weights of the rolled steel segments.

According to the present invention there is provided a roadway support for underground mine workings, comprising a series of interconnectable supporting arches arrayed along the length of the roadway and assembled in the arch direction from rolled steel segments with local overlapping zones, the rolled steel segments having a profile cross-section comprising a trough zone bordered by two narrower edging troughs open to the opposite face from the trough zone, the supporting arches being assembled from outer rolled steel segments disposed with the backs of the trough zones facing the rock, together with inner rolled steel segments disposed with the backs of the trough zones facing the roadway but leaving a yielding gap, the backs of the edging troughs of the inner rolled steel segments running yieldably in the trough zones of the outer rolled steel segments.

Thus, in accordance with the invention, the outer 1 1 3 - rolled steel segments on the one hand and the inner rolled steel segments on the other hand are shaped differently, to an extent which allows the backs of the edging troughs of the inner rolled steel segments to run as specified in the trough zones of the outer rolled steel segments. A very welldefined yieldability is attained in this way. It is selfevident that appropriate clamping means must be provided in the overlaps between the yieldably disposed rolled steel segments. They can consist of clamping shoes attached to the backs of the edging troughs of the outer rolled stel segments, to be tightened with clamping b olts, or one can use straps and provide openings in the backs of the edging troughs of the outer rolled steel sections to accommodate the strap components. It is selfevident that no back-filling concrete will normally be introduced in the vicinity of the yielding gaps, or that a yieldable back-filling will be used.

There are several possibilities for the further modification and adaptation of the object of the invention, in detailed respects. In one preferred embodiment of the invention, the outer rolled steel segments and the inner rolled steel segments have edging troughs of similar shape, fitting one inside another, but differ in the width of their trough zones. It is recommended in this connection to adopt an arrangement whereby the edging troughs have a trapezium- shaped cross-section, with flanges facing towards the adjacent supporting arches. Looking along the length of the roadway the trough zones preferably run straight.

In the yieldability zones between successive 4 supporting arches in the roadway support as described, there appear as it were windows, the height of which is reduced as the telescopic yielding action progresses. It is preferred to provide clamping members in the vicinity of the yielding gaps, attaching them to the backs of the edging troughs of the outer rolled steel segments. It is possible in this case to adopt an arrangement whereby the flanges of the inner rolled steel segments are yieldably clamped between the clamping members and the backs of the edging troughs of the outer rolled steel segments. It is self-evident that the clamping is effected with the aid of suitable bolts.

proposal of the invention is characterised that that successive supporting arches abut each other with the flanges on the edging troughs of the outer rolled steel segments, optionally through interposed positive locking members, A further connecting members being disposed on the backs of the edging troughs in the abutment area. It is again possible in this case to clamp the flanges of the inner rolled steel segments yieldably between the connecting members and the backs of the edging troughs of the outer rolled steel segments.

In order to bring the supporting structures into connection with the backfilling concrete, the outer rolled steel segments can be provided with anchoring elements on t he backs of their trough zones. Alternatively, the outer rolled steel segments can have openings through which rock-face anchors can be introduced.

The manufacture and forming of the rolledsteel segments can be effected by a wide range of methods. In 4 - particular, the outer rolled steel segments and/or the inner rolled steel segments can be single-piece steel components. However, it is equally possible to weld together the outer rolled steel segments and/or the inner rolled steel segments 5 from separate shaped components.

The invention will now be described in greater detail, by way of example, with reference to the accompanying drawings, in which:- Figure 1 is a schematic view in perspective of an assembled roadway support of the invention; Figure 2 is a cross-section on a larger scale than Figure 1, through a roadway support of the invention, in the form of a complete ring of supporting arches; and Figure 3 is a section taken on the line A-A of Figures 1 and 2.

The roadway support shown in the drawings is intended more particularly for underground mine workings, and consists basically of a series of interconnectable supporting arches 1 arrayed along the length of the roadway and assembled in the arch direction from rolled steel segments 2, 3, with local overlapping zones 0. The rolled steel segments 2, 3 have a profile cross-section comprising a trough zone 21,_ 31 bordered by two narrower edging troughs 22, 32. The edging troughs 22, 32 are open to the opposite face from the trough zone 21, 31.

It will be seen more particularly by comparing Figures 1 and 3 that the supporting arches 1 are assembled from outer rolled steel segments 2 disposed with the backs of the trough zones 21 facing the rock, together with inner rolled steel segments 3 disposed with the backs of the trough zones 31 facing the roadway but leaving a yielding gap A. The arrangement is such that the backs of the edging troughs 32 of the inner rolled steel segments 3 run yieldably in trough zones 21 of the outer rolled steel segments 2. In the embodiment shown the outer rolled steel segments 2 and the inner rolled steel segments 3 have edging troughs 22, 32 of similar shape but differ in the width of their trough zones 21, 31. The edging troughs 22, 32 have a trapezium-shaped cross-section, with flanges 22, 32 facing towards the adjacent supporting arches 1. Figure 3 particularly clearly shows that looking along the length of the roadway the floors of the trough zones 21, 31 run straight.

In the vicinity of the yielding gaps A between the rolled steel segments 2, 3 there are provided clamping members 4 attached to the backs of the edging troughs 22 of the outer rolled steel segments 2 with the aid of bolts 5. The clamping members 4 can be made from steel sheet or plate. it will be seen that the flanges 33 of the inner rolled steel segments 3 are clamped between the clamping members 4 and the backs of the edging troughs 22 of the outer rolled steel segments 2. Telescopic yieldability is provided in this way.

Successive supporting arches 1 abut each other with the flanges 23 on the edging troughs 22 of the outer rolled steel segments 2, where positive locking members 6 are interposed in the embodiment shown. In this case, connecting members 7 are disposed on the backs of the edging troughs 22 1 1.

7 of the outer rolled steel segments 2 in the abutment area.. These members again serve the further purpose of clamping the flanges 33 of the inner rolled steel segments 2. Once again, yieldability can be controlled by the bolts 5.

Figure 3 shows that the outer rolled steel segments 2 are provided with anchoring elements 8 on their backs, for anchoring to the back-filling concrete 9. Figure 3 also shows that the outer rolled steel segments 2 have openings 10 through which rock-face anchors 11 are introduced. The outer flanks of the edging troughs 22 of the outer rolled steel segments can be extended tow ards the rockface as indicated on the left in Figure 3. This creates as it were compartments between the rock-face and the outer rolled steel segments 2, which can be very completely filled with concrete without difficulty. It is obviously possible to seal the endfaces of these compartments and provide holes for the injection of concrete.

In the embodiment shown, the outer rolled steel segments 2 and the inner rolled steel segments 3 are welded from separate shaped components. They could however consist of single-piece components.

Claims

1. A roadway support for underground mine workings, comprising a series of interconnectable supporting arches arrayed along the length of the roadway and assembled inthe arch direction from rolled steel segments with local overlapping zones, the rolled steel segments having a profile cross-section comprising a trough zone bordered by two narrower edging troughs open to the opposite face from the trough zone, the supporting arches being assembled from outer rolled steel segments disposed.with the backs of the trough zones facing the rock, together with inner rolled steel segments disposed with the backs of the trough zones facing the roadway but leaving a yielding gap, the backs of the edging troughs of the inner rolled steel segments running yieldably in the trough zones of the outer rolled steel 1-5 segments.

2. A support as in Claim 1, wherein the outer rolled steel segments and the inner rolled steel segments have edging troughs of similar shape, but differ in the width of their trough zones.

3. A support as in either of Claims 1 and 2, wherein the edging troughs have a trapezium-shaped cross-section, with flanges facing towards the adjacent supporting arches.

4. A support as in any of Claims 1 to 3, wherein the trough zones have straight trough floors, looking along the length of the gallery.

5. A support as in any of Claims 1 to 4, wherein clamping members are provided in the vicinity of the yielding z j! gaps, attaching them to the backs of the edging troughs of the outer rolled steel segments.

6. A support as in Claim 5, wherein flanges of the inner rolled steel segments are yieldably clamped between the clamping members and the backs of the edging troughs of the outer rolled steel segments.

7. A support as in any of Claims 1 to 6, wherein successive supporting arches abut each other with the flanges of the edging troughs of the outer rolled steel optionally through interpose.d positive locking segments, members.. connecting members being disposed on the backs of the edging troughs in the abutment area.

8. A support as in Claim 7, wherein flanges of the inner rolled steel segments are yieldably clamped between the connecting members and the backs of the edging troughs of the outer rolled steel segments.

9. A support as in any of Claims 1 to 8, wherein the outer rolled steel segments are provided with anchoring elements on their backs, for backfilling concrete.

10. A support as in any of Claims 1. to 9, wherein the outer rolled steel setments have openings through which rock-face anchors can be introduced.

11. A support as in any of Claims 1 to 10, wherein the outer rolled steel segments and/or the inner rolled steel segments are formed in a single piece from steel plate.

12. A support as in any of Claims 1 to 10, wherein the outer rolled steel segments and/or the inner rolled steel segments are welded together from separate shaped components.

-

13. A roadway support substantially as hereinbefore described with reference to the accompanying drawings.

Published 1991 at The Patent Office. Concept House, Cardiff Road. Newport. Gwent NP9 1RH. Further copies may be obtained fmro Sales Branch. Unit 6. Nine Mile Point Cwrafelinfach. Cross Keys. Newport NP1 7HZ. Printed by Multiplex techniques ltd, St Mary Cray. Kent.