GB1595420A

GB1595420A - Wire lining for mine and tunnel roof supports

Info

Publication number: GB1595420A
Application number: GB5356077A
Authority: GB
Original assignee: Thyssen Industrie AG
Current assignee: ThyssenKrupp Technologies AG
Priority date: 1977-01-27
Filing date: 1977-12-22
Publication date: 1981-08-12
Also published as: DE2703241C2; DE2703241B1

Description

(54) WIRE LINING FOR MINE AND TUNNEL ROOF SUPPORTS (71) We, THYSSEN INDUSTRIE AG, a Company organised according to the laws of the Federal Republic of Germany of Am Thyssenhaus 1, 4300 Essen, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: The present invention relates to a wire lining mat for a lining for gallery supports in mines and tunnels, comprising wire lining mats which can be coupled together to form a chain of mats and are formed of longitudinal and transverse rods or members welded together at the points of intersection, the longitudinal members being bent out at one end from the plane of the mat towards the interior of the gallery and at the other end are bent over generally at right angles to the plane of the mat in U-shaped form, and in the region of the bent-over longitudinal member ends there is welded-on at least one transverse end member which, in co-operation with the engaged U-shaped ends of the longitudinal members of an adjacent lining mat of similar type which is to be a new introduction into the chain of mats, provides both a connection between the lining mats concerned which is resistant to tensile and compressive stresses and also supports the newly fitted lining mat in order to allow forepoling of the said mat.

From German patent 2159459 a wire lining consisting of lining mats of this kind is known whose longitudinal members at one end, namely at that end which is directed towards the working face after fitting into the lining, are bent over in V-shaped form open towards the gallery wall, and a through transverse member is welded in each case to the apexes situated in one plane and to the free legs of the V-shaped bent-over portions at a spacing from the ends of the longitudinal members. At their opposite ends the longitudinal members are bent round at right angles to the plane of the mat towards the gallery interior to form U-shaped hooks.When a new lining mat is fitted into position, the free ends of these hooks are introduced through between the aforesaid transverse member at the V-shaped bent-over ends of the longitudinal members of the already fitted lining mat, and the lining mat which is to be added to the chain is moved until it comes to abut in the bottom of the hook in the direction towards the working face. In this way a connection resistant to tensile forces is already established between two such lining mats.In order also to make this connection resistant to pressure forces and to hold the new mat as a forepoling section at the face, the free ends of the U-shaped hooks of the forepoled lining mat are than to be bent over at right angles in such a manner oppositely to the direction of forepoling that the internal curve of each longitudinal member end thus bent over bears securely on the transverse member welded to the apexes of the already securely positioned mat.

Although this known wire lining affords the advantage that the connecting points between the lining mats are resistant both to tensile forces and also to compressive forces, on the other hand such wire linings do not meet the expected requirements in every case. More particularly since the connection between the lining mats becomes resistant to pressure forces only by the bending over of the free ends of the U-shaped hooks of the longitudinal members of the new lining mat which is effected after hanging-up, and forepoling of the said new mat is ensured only when some of the bent-over portions take over the task of supporting by abutment on the corresponding transverse members of an already forepoled lining mat of the wire lining.

The invention has as its object to improve a wire lining of the kind specified hereinbefore by suitable construction of the ends of the lining mats, in such a manner that the lining mats of the wire lining are already connected by means of a connection resistant to tensile and compressive forces and are capable of forepoling when coupled into the chain of mats, in other words the connection betwecn an already secured lining mat and a new lining mat to be fitted is resistant to tensile and compressive forces at forepoling without special aids and without subsequent bending-over or folding of longitudinal members or similar measures, simply by fitting into one another the two mutually facing sides of the lining mats which are to be connected together, and so that the new lining mat to be fitted is held in the forepoling position.

According to the present invention there is provided a wire lining mat for a wire lining for roof support in mines and tunnels, the mat being formed of longitudinal and transverse members welded together at the intersections, the free ends of the longitudinal members at one end of the lining mat being bent over at angles substantially within the range 45" to 90 out of the plane of the mat towards the gallery interior, a transverse end member connecting the bent-over free ends of the longitudinal members being weldedon near the bends of the longitudinal members, the other ends of the longitudinal members having U-shaped hooks extending into the interior of the gallery out of the plane of the mat for engaging the transverse end member of an adjacent mat, the free ends of the U-shaped hooks being bent round parallel to the transverse members and all directed in the same direction and the parallel portion being of a length which is smaller than the clear spacing between two neighbouring longitudinal members, the spacing between the bend of each U-shaped hook and its bent-round free end being of such a size that the bent-round ends of the Ushaped hooks of a newly fitted lining mat can abut on the bent-over free ends of the said one end of the longitudinal members of an adjacent already fitted lining mat so that the newly-fitted lining mat is supported on the already fitted lining mat in such a manner as to be capable of forepoling and is situated at least approximately in the plane of the already fitted lining mat.

The invention also provides a wire lining composed of such mats interengaged with one another.

A wire lining within the present invention has the advantage over the prior art wire lining constructions that it can be produced by simply fitting the lining mats together without using any special tools, and the connection between two lining mats is stable against tension and compression immediately after the new mat is hung in the chain of mats, and the newly hung lining mat is held in the forepoling position. This obviates undesired oblique positioning or displacement of the lining. When using a wire lining within the present invention below a gallery roof, the forepoled lining mat will in fact bend slightly because of its own dead weight as a result of the elasticity of the steel, but it bears effectively against the lining mat already fitted. so that any undesirable amount of sagging is reliably avoided.

The reduction in undesired sagging of the forepoled lining mat and the resistance of the connection between two wire lining mats against compressive stresses can be also improved by a preferred arrangement in which the spacing between the bend of each U-shaped hook and its bent-round free end is of such a size that the said free ends can abut on the bent-over free ends of the said one ends of the longitudinal members of the already fitted lining mat and on the transverse end member which connects the bentover free ends of the said one end of this lining mat. This arrangement is useful in the case of lining mats wherein the free ends of the longitudinal members at one side of the lining mat are bent-over at an angle of less than about 75 out of the plane of the lining mat towards the interior of the gallery.

According to a further preferred feature it may be advantageous in many cases to make the free ends of the U-shaped hooks of the longitudinal members bent-round in the first instance to form a portion parallel to the transverse members, and then to have a portion bent back in U-shaped manner parallel to the longitudinal members towards the mat end, so that the thus-formed horizontal hooks of the forepoled lining mat surround the bent-over free ends of the longitudinal members of the already fitted lining mat and secure the forepoled lining mat against lateral displacement.

Particular embodiments of the invention will now be described by way of example only with reference to the accompanying drawings, in which: Fig. I shows a view in perspective of the connection region between two lining mats of a wire lining (fragmentary view), Fig. 2 shows the area "A" from Fig. 1 on a larger scale before the final connection is established between the two lining mats, Fig. 3 is a schematic view of the area "A" for showing the mutual positioning of the rods in an embodiment wherein the free ends of the longitudinal members are bent over out of the plane of the lining mat at an angle of less than 75 , Fig. 4 shows the connection region corresponding to the area "A" in Fig. I with a further embodiment of hook construction.

A wire lining comprises a plurality of lining mats 1 and 2 of which the lining mats 1 are already fitted and supported by the usual roof support frames 3, and the lining mats 2 are forepoled (for greater clarity in the drawings, only the mutually facing different ends of the lining mats 1 and 2, which are otherwise of completely identical construction, are shown in a partial view of the wire lining structure). The lining mats 1, 2 comprise longitudinal members 4, 14 respectively, and also transverse members 5 and 5a, and 15 respectively, these respective longitudinal and transverse members being connected by welding in a manner known per se at the points of intersection.The free ends 6 at one end of the longitudinal members 4 directed in the advancing direction indicated by arrow 16 are bent over at an angle a of about 45 out of the plane of the mat towards the gallery interior (see Fig. 2). Near the bend 7 of the bent-over free ends 6 of the longitudinal members 4 there is welded to these a transverse end member 5a which is engaged by U-shaped hooks 8 at the other ends of the longitudinal members 14 of the lining mat 2 being forepoled which lie on the transverse end member 5a.The free ends 9 of the U-shaped hooks 8 are bent round, all directed in the same direction indicated by arrow 10, to be parallel to the transverse members 5, 5a, 15 and the length 11 of the parallel portion of the free ends 9 of the Ushaped hooks 8 is shorter than the clear spacing 12 between two neighbouring longitudinal members 4. The spacing 13 of the bent-round free end 9 of the U-shaped hook 8 of each longitudinal member from the bend of the U-shaped form, is made of such a magnitude that these free ends 9 abut on the bent-over free ends 6 of the longitudinal members 4 of the already fitted lining mat 1, so that the newly fitted lining mat 2 bears on the free ends 6 and is thereby situated in substantially the same plane as the lining mat 1.In this position the lining mat 2 is held cantilevered out freely, that is to say forepoled, so that the fitting of further roof support frames is facilitated.

In the example shown in Figure 3, the free end 9 of the longitudinal member 14 abuts both on the bent-over free end 6 of the longitudinal member 4 and also on the transverse end member 5a, so that a reliable and pressure-resistant holding of the forepoled lining mat 2 on the lining mat 1 is ensured. (In the figure, a space is shown between the free end 9 and the end member 5a. This is merely to show clearly the interengagement of the ends 9 and 6 and the rod 5a. In reality the end 9 abuts the rod 5a, at least after forepoling, to prevent relative longitudinal displacement of coupled mats.) In the embodiment of the invention shown in fragmentary form in Figure 4, another arrangement of the connection between two lining mats of a wire lining system is illustrated.In this the free ends 9 of the U-shaped hooks 8 of the longitudinal members 14 of a forepoled mat 2, were initially bent parallel to the transverse member 5a, then end portions were bent back parallel to the longitudinal members 14 in U-shaped manner towards the end of the mat. In this way a horizontal further hook is formed which after the forepoling of the lining mat 2 engages about the bent-over free ends 6 of the longitudinal members 4, and beneath the transverse end member 5a of an already fitted lining mat, so that the forepoled lining mat is also secured against lateral displacement and tilting transversely.

The forepoling of the lining mat 2 will be explained with reference to Figure 2. The way in which it is carried out is that the lining mat 2 is placed with the ends of the longitudinal members 14 having the Ushaped hooks 8 lying on the transverse end member 5a of the lining mat 1, the U-shaped hooks 8 being approximately in the position shown in broken lines. Then the lining mat 2 is advanced in the direction of advance 16 until the U-shaped hooks 8 abut on the transverse final member 5a of the lining mat 1 (position shown in full lines). Then the lining mat 2 is displaced in the direction 17 until its longitudinal members 14 abut on the longitudinal members 4 (see Figure 1 and Figure 3).Thus the forepoling operation is completed and the connection between the lining mat 1 and the lining mat 2 which has been produced is resistant to both tensile and compressive forces.

Under certain underground conditions it may be advantageous for the U-shaped hooks 8 of the new lining mat 2 being fitted to be provided with ends parallel to the longitudinal wires 14, as shown in broken lines in Figure 2. The final step in making a mat according to the invention, namely the bending-round of these ends 9 in the shape of a hook as shown in Figures 3 and 4, is then carried out at the actual site; this has the advantage that the plane of the lining mat 2 can be positioned at an angle to the plane of the already fitted lining mat 1 and held therein.

WHAT WE CLAIM IS: 1. A wire lining mat for a wire lining for roof support in mines and tunnels, the mat being formed of longitudinal and transverse members welded together at the intersections, the free ends of the longitudinal members at one end of the lining mat being bent over at angles substantially within the range 45 to 90 out of the plane of the mat towards the gallery interior, a transverse end member connecting the bent-over free ends of the longitudinal members being weldedon near the bends of the longitudinal mem

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. lining mats 1 and 2 of which the lining mats 1 are already fitted and supported by the usual roof support frames 3, and the lining mats 2 are forepoled (for greater clarity in the drawings, only the mutually facing different ends of the lining mats 1 and 2, which are otherwise of completely identical construction, are shown in a partial view of the wire lining structure). The lining mats 1, 2 comprise longitudinal members 4, 14 respectively, and also transverse members 5 and 5a, and 15 respectively, these respective longitudinal and transverse members being connected by welding in a manner known per se at the points of intersection.The free ends 6 at one end of the longitudinal members 4 directed in the advancing direction indicated by arrow 16 are bent over at an angle a of about 45 out of the plane of the mat towards the gallery interior (see Fig. 2). Near the bend 7 of the bent-over free ends 6 of the longitudinal members 4 there is welded to these a transverse end member 5a which is engaged by U-shaped hooks 8 at the other ends of the longitudinal members 14 of the lining mat 2 being forepoled which lie on the transverse end member 5a.The free ends 9 of the U-shaped hooks 8 are bent round, all directed in the same direction indicated by arrow 10, to be parallel to the transverse members 5, 5a, 15 and the length 11 of the parallel portion of the free ends 9 of the Ushaped hooks 8 is shorter than the clear spacing 12 between two neighbouring longitudinal members 4. The spacing 13 of the bent-round free end 9 of the U-shaped hook 8 of each longitudinal member from the bend of the U-shaped form, is made of such a magnitude that these free ends 9 abut on the bent-over free ends 6 of the longitudinal members 4 of the already fitted lining mat 1, so that the newly fitted lining mat 2 bears on the free ends 6 and is thereby situated in substantially the same plane as the lining mat 1.In this position the lining mat 2 is held cantilevered out freely, that is to say forepoled, so that the fitting of further roof support frames is facilitated. In the example shown in Figure 3, the free end 9 of the longitudinal member 14 abuts both on the bent-over free end 6 of the longitudinal member 4 and also on the transverse end member 5a, so that a reliable and pressure-resistant holding of the forepoled lining mat 2 on the lining mat 1 is ensured. (In the figure, a space is shown between the free end 9 and the end member 5a. This is merely to show clearly the interengagement of the ends 9 and 6 and the rod 5a. In reality the end 9 abuts the rod 5a, at least after forepoling, to prevent relative longitudinal displacement of coupled mats.) In the embodiment of the invention shown in fragmentary form in Figure 4, another arrangement of the connection between two lining mats of a wire lining system is illustrated.In this the free ends 9 of the U-shaped hooks 8 of the longitudinal members 14 of a forepoled mat 2, were initially bent parallel to the transverse member 5a, then end portions were bent back parallel to the longitudinal members 14 in U-shaped manner towards the end of the mat. In this way a horizontal further hook is formed which after the forepoling of the lining mat 2 engages about the bent-over free ends 6 of the longitudinal members 4, and beneath the transverse end member 5a of an already fitted lining mat, so that the forepoled lining mat is also secured against lateral displacement and tilting transversely. The forepoling of the lining mat 2 will be explained with reference to Figure 2. The way in which it is carried out is that the lining mat 2 is placed with the ends of the longitudinal members 14 having the Ushaped hooks 8 lying on the transverse end member 5a of the lining mat 1, the U-shaped hooks 8 being approximately in the position shown in broken lines. Then the lining mat 2 is advanced in the direction of advance 16 until the U-shaped hooks 8 abut on the transverse final member 5a of the lining mat 1 (position shown in full lines). Then the lining mat 2 is displaced in the direction 17 until its longitudinal members 14 abut on the longitudinal members 4 (see Figure 1 and Figure 3).Thus the forepoling operation is completed and the connection between the lining mat 1 and the lining mat 2 which has been produced is resistant to both tensile and compressive forces. Under certain underground conditions it may be advantageous for the U-shaped hooks 8 of the new lining mat 2 being fitted to be provided with ends parallel to the longitudinal wires 14, as shown in broken lines in Figure 2. The final step in making a mat according to the invention, namely the bending-round of these ends 9 in the shape of a hook as shown in Figures 3 and 4, is then carried out at the actual site; this has the advantage that the plane of the lining mat 2 can be positioned at an angle to the plane of the already fitted lining mat 1 and held therein. WHAT WE CLAIM IS:

1. A wire lining mat for a wire lining for roof support in mines and tunnels, the mat being formed of longitudinal and transverse members welded together at the intersections, the free ends of the longitudinal members at one end of the lining mat being bent over at angles substantially within the range 45 to 90 out of the plane of the mat towards the gallery interior, a transverse end member connecting the bent-over free ends of the longitudinal members being weldedon near the bends of the longitudinal mem

bers, the other ends of the longitudinal members having U-shaped hooks extending into the interior of the gallery out of the plane of the mat for engaging the transverse end member of an adjacent mat, the free ends of the U-shaped hooks being bent round parallel to the transverse members and all directed in the same direction and the parallel portion being of a length which is smaller than the clear spacing between two neighbouring longitudinal members, the spacing between the bend of each U-shaped hook and its bent-round free end being of such a size that the bent-round free ends of the U-shaped hooks of a newly fitted lining mat can abut on the bent-over free ends of the said one end of the longitudinal members of an adjacent already fitted lining mat so that the newly fitted lining mat is supported on the already fitted lining mat in such a manner as to be capable of forepoling and is situated at least approximately in the plane of the already fitted lining mat.

2. A lining mat according to claim I wherein the spacing between the bend of each U-shaped hook and its bent-round free end is of such a size that the said free ends can abut on the bent-over free ends of the said one ends of the longitudinal members of the already fitted lining mat and on the transverse end member which connects the bent-over free ends of the said one end of this lining mat.

3. A lining mat according to claim I wherein the bent-round free ends of the Ushaped hooks are bent back parallel to the longitudinal members in U-shaped form towards the end of the mat, and is engageable below the transverse end member of the adjacent mat.

4. A lining mat substantially as herein described with reference to and as illustrated in Figs. I and 2, or Fig. 3 or Fig. 4 of the accompanying drawings.

5. A wire lining for a gallery roof composed of a plurality of wire lining mats as claimed in any one of the preceding claims, the U-shaped hooks of the said other ends of the longitudinal members of one mat being engaged round the transverse end member at the one end of an adjacent mat and the bentround ends of the U-shaped hooks abutting on the bent over free ends of the said one ends of the longitudinal members of the said adjacent mat.