GB2178783A - Mat for the lining of underground spaces and process for production - Google Patents

Abstract

At the other end of the mat each longitudinal rod 1 is formed with a cornegation 9 aligned with the longitudinal rod 1 and an end portion to extending downwardly and sideways. A transverse rod 8 is welded to the lowest portion 7 of the cornegations 9 and a further transverse rod 13 is welded to the end portion 10. Adjacent mats are joined as shown. <IMAGE>

Description

SPECIFICATION Gap-closure matforthe lining of underground spaces and process for production The invention relates in classification to a gap-closure matforthe lining of underground spaces, with welded lattice of longitudinal rods and transverse rods, in which the longitudinal rods are shaped at one hook mat end into U-shaped hooks lying in the plane ofthe mat with one free hook leg, at the complementary mat end into attachment elements for the hooks of an identically formed closure mat to be attached, whiletheattachmentelementscomprisea piece bent off to the plane of the mat and a longitudinal rod end attached thereto and again bent towards the plane of the mat,whileasupporttransverserodforthehooks of the mat to be attached is arranged in the deepest part ofthe bending.It is required of such gap-closure mats, which are also called combination mats, that they are easy to fit and use as lining in underground spaces and that in the installed condition they are capable oftaking up high traction forces. The invention further relates to a processforthe production of such gap-closure mats.

In the known gap-closure mat (Fed. German P.S.

2,805,200, Figure 1, Figure 1 a) the longitudinal rod ends bent again towards the plane ofthe mat adjoining the pieces bent over obliquely to the plane ofthe mat are guided in a projection on to the plane ofthe mat obliquely ofthe direction ofthe longitudinal rods.

They form stops for the free hook legs which pivot out under load, which moreover rest with the opposite hook leg on the supporttransverse rod. Intheknown form ofembodimentthe coupling effected with the hooks of U-shaped curvature and the described attachment elements with supporttransverse rod is in need of im provement with regard to firmness of configuration and stability ofthe coupling in advance lining and with regard to the traction strength inthe taking up ofthe rock forces.In the tasking up oftraction forces caused by the rock forces it is not possibleto prevent the U-shaped hooks from slipping with their deepest hook parts on the obliquely bent-off piece of the longitudinal rods and the free hook legs from bending out of the plane ofthe mattowards the oppo- site side and slipping from the stops.

On the other hand the invention is based upon the problem of improving a gap-closure mat according to classification as regards firmness of configuration and stability in advance lining and with regard to the traction strength in the taking up of rock forces.

For the solution ofthis problem the invention instructs that the longitudinal rockendstogetherwith the bent off pieces firstlyform a corrugation the projection of which on to the plane ofthe mat extends in the direction ofthe longitudinal rods,whilethesup- port transverse rod is arranged in the deepest part of the corrugation, andthatthe longitudinalrodends, adjoining the corrugation after a bending extending substantially in the plane of the mat and in the direction ofthe longitudinal rods, in a projection on to the plane of the mat are bentoffobliquely ofthe direction ofthe longitudinal rods to form a passageforthefree hook legs and are united by a concluding support transverse rod for both hook legs of the gap-closure matto be attached. The corrugationscan bemadefor example as V-shaped corrugations but they can also be of U-shaped configuration. A preferred form of embodiment ofthe inventidn, which is distinguished in the stability respect and renders possible a short style of construction of the coupling as a whole, is characterised in that the longitudinal rod ends,following the bending, are bent off perpendicularly in a projection in the plane of the mat.

The invention is based upon the determination of the fact that in the known form ofembodimentthe longitudinal rod ends attached to the pieces bent off at right angles to the plane ofthe mat and benttothe plane ofthe mat again are not sufficient for a gapclosure mat which is distinguished in assembly by adequate firmness of configuration and stability and takes up the traction forces caused by the rock forces.

In fact it is known (Fed. German P.S. 2,805,200, Figures 2 to 6) furtherto deform the longitudinal rod ends so that they grasp overthefree hook legs trans versely ofthe extent of the longitudinal rods, but this leads to considerable difficulties in handling technique which have hitherto opposed the introduction of such gap-closure mats in practice, and also causes considerable difficulties in manufacturing technique since the longitudinal rods must be correspondingly pre-deformed before they can be united with the transverse rods to form the welded lattice. On the other hand the production of the closure mats according to the invention is especially simple.To this extent a processforthe production of a gap-closure mat of the described assembly from a flat welded lattice, where at one end the U-shaped hooks are formed by bending on the hook mat end, is of special importance. It is characterised in that at the complementary mat end in oneoperationthecorrugationsareformed and then orthereafter all longitudinal rod ends with the concluding support transverse rod are further deformed in common into the passages. It is of especial advantage that without difficulty it is possible to work with longitudinal rods which are doubled by zones or over the entire length.

The invention will be explained in greater detail below by reference to a drawing representing only one example of embodiment, wherein, in diagrammatic representation: Figure 1 shows in perspective a detail of a gapclosure mat according to the invention, namely for the one partthe hookmatend, forthe other partthe complementary mat end, in the coupled condition, Figure 2 shows the enlarged detail A of the object of Figure 1, and Figures3 and 4show measures in the production of a gap-closure mat according to the invention and Figure Sshows the enlarged detail B of the o bject of Figure 4.

The gap-closure mat as represented in Figures 1,2 and 4is intendedforthe lining of underground spaces. In its fundamental assembly it consists of a welded lattice G of longitudinal rods 1 and transverse rods 2. The longitudinal rods 1 are shaped at one hook mat end into U-shaped hooks 3 lying in the plane of the mat with a free hook leg 4, and at the complementarymatend into attachmentelements5forthehooks 3 of an identically formed gap-closure mat to be attached. The two mat parts M in Figure 1 show this attachment. They combine moreover into a gapclosure mat according to the invention. The attachment elements 5 consist of a piece 6 bent off out of the plane ofthe mat, which continues the longitudinal rods 1 in a projection on to the plane ofthe mat, and of a longitudinal rod end attached thereto and again bent towards the mat.In the deepest part 7 ofthe bending there is arranged a supporttransverse rod 8 for the hooks 3 ofthe mat to be attached. From comparison of Figures 1 and 2 it is seen that the longitudinal rod ends together with the bent-off pieces 6 firstlyform a corrugation 9 the projection of which on to the plane of the mat extends in the direction ofthe longitudinal rods 1, whilethe supporttransverse rod 8 is arranged in the deepest part 7 of the corrugation.

The longitudinal rod ends 10, adjoining thecorruga- tion, after a bending 11 extending in the plane ofthe mat, are bent in a projection on to the plane ofthe mat obliquely ofthe direction ofthe longitudinal rods 1 to form a passage 12 for the free hook legs 4. They are further united by a concluding supporttransverse rod 13 for the U-shaped hooks 3 ofthe matto be attached in each case, in which connection reference is made especially to Figure 2.

The Figures show the preferred form of embodi ment ofthe invention in which the corrugation 9 is made as a V-shaped corrugation. They could also be shaped as U-shaped corrugation, that is with steeper corrugation legs, so to speak. In the example of embodiment the longitudinal rod ends 10 are bent off perpendicularly, adjoining the bending 11, in a projection in the plane ofthe mat. If the strength and stability relationships are examined, it is seen that the gap-closure mat according to the invention in assemblywithidenticallysimilargap-closure mats is distinguished by special firmness of configuration and stability in advance lining and by high traction resist ance in the taking up of rock forces.

Figures 3to 5 show how a gap-closure mataccord- ing to the invention can be manufactured in a simple manner. Commencement is here madefrom a welded lattice G as represented in Figure 3. This is a flat welded lattice having longitudinal rods 1 protruding far at one end. These are bent overto form the U-shaped hooks 3 and then form the hook mat end. At the complementary mat end the corrugations 9 are formed in one operation, in which connection refer ence is made to Figure 4. Then orthereafter all the longitudinal rod ends 10 are further deformed with the concluding supporttransverse rod 13 in common to form the passages 12. In Figures 4 and 5 it is seen at 14thatthen the longitudinal rod ends 10, after bending over in the mat plane, are bent off in a projection on to the plane ofthe mat obliquely ofthe direction of the longitudinal rods 1. Itis understoodthatthe longitudinal rods 1 can be doubled in part or as a whole over the entire length,to increase the bearing capacity ofthe gap-closure mat.

Claims (7)

1. Gap-closure matfor lining underground spaces, with welded lattice of longitudinal rods and transverse rods, where the longitudinal rods are shaped at one hook mat end into U-shaped hooks lying in the plane of the mat with a free hook leg, at the complementary mat end into attachment elements forthe hooks of an identically formed closure mat to be attached, while the attachment elements comprise a piece bentofftowardsthe planeofthe matanda longitudinal rod end attached thereto and again bent towards the plane of the mat, while in the deepest part ofthe bending there is arranged a supporttransverse rod forthe hooks of the mat to be attached, characterised inthatthelongitudinal rod ends (10) together with the bent-off pieces (6) firstly form a corrugation (9) the projection of which on to the plane ofthe mat extends in the direction ofthe longitudinal rodsf1),whilethesupporttransverse rod (8) is arranged in the deepest part (7) ofthe corrugation, and in that the longitudinal rod ends (10), adjoining the corrugation (9), after a bending (11) extending substantially in the plane ofthe mat and in the direction ofthe longitudinal rods (1), are bentoffin a projection on to the mat plane obliquely ofthe direction ofthe longitudinal rods (1 )to form a passage (12) forthefree hook legs (4) and are united by a concluding supporttransverse rod (13) for both hook legs of the U-shaped hooks (3) of the closure mat to be attached.

2. Gap-closure mataccordingto Claim 1,characterised in that the corrugation (9) is made as a V-shaped corrugation.

3. Gap-closure mataccording to Claim 1,characterised in that the corrugation (9) is made as a U-shaped corrugation.

4. Gap-closure mat according to one of Claims 1 to 3, characterised in that the longitudinal rod ends (10), adjoining the bending, are bent off perpendicularly in a projection in the plane of the mat.

5. Processforthe production of a gap-closure mat according to one of Claims 1 to 4from aflatwelded lattice,where on the one hand the U-shaped hooks are bent on the hook mat end, characterised in that at the complementary matend in one operation the corrugationsareformed and then orthereafterall longitudinal rod ends with the concluding support transverse rod are further deformed in common to form the passages.

6. Agap-closurematsubstantiallyasdescribed with reference to and as illustrated by any one ofthe embodiments shown in the accompanying drawings.

7. A process as claimed in claim 5, substantially as hereinbefore described.