EP0023619B1 - Two-part clamping device - Google Patents

Abstract

1. Pair of connecting strainers for interlocated reciprocally braced ends of channel-shaped mine-lining frames, of which the clamping connectors (A, B) comprise, engaging under the gallery-side lining profile (2) and bearing on the flanges (6) thereof, half-clamps (9, 9'), the flanges (13) of which are traversed by the shanks of hook-head bolts (11), the hook heads of which engage over the flanges (5) of the face-side lining profile (1) and bolted onto the ends of which are clamping nuts (12) which are braced on those sides of the flanges (13) of the half-clamps (9, 9') which are remote from the face-side lining profile (1), the clamping connector (A), which is associated with the end of the face-side lining profile (1) having, to bridge this, a cover plate (10) provided, for the hook heads of the bolts (11) of the clamping connector (A), with in each case a throughway aperture (25, 26) and with a drive member (15) associated with the face-side lining profile (1), a drive member (14) being provided on the halb-clamp (9') of the clamping connector (B) associated with the end of the gallery-side lining profile (2) and being associated with the gallery-side lining profile (2), characterised in that at least the half-clamp (9) of the clamping connector (A) which is associated with the face-side lining profile consists of two parts (16) which are separably connected to each other in the regions of their contacting face (17), the mutually contacting contours of half-clamp (9) and gallery-side lining profile (12) and the throughway apertures (25, 26) in the cover plate (10) being so formed that by separating the two parts (12), it is possible to bring about an opening-out movement of hook-head bolts (11) and half-clamp parts (16), permitting of a friction-inhibited and limited slipping of the gallery-side lining profile (2).

Description

The invention relates to a pair of clamping connections for mutually lying, mutually supporting ends of trough-shaped pit support frames, the clamping connections of which have the track-side expansion profile, under which the half-clamps rest against the flanges, the flanges of which are penetrated by the shanks of hook-head screws, the hook heads of which flanges of the butt-side expansion profile on the ends of which clamping nuts are screwed, which are supported on the sides of the flanges of the half clamps facing away from the butt-side expansion profile, the tensioning connections assigned to the end of the butt-side expansion profile having a bridging tab which provides a passage opening for the hook heads of the screws of this tensioning connection is equipped with a driver assigned to the expansion profile on the impact side, and on the half-clamp of the clamping connection assigned to the end of the expansion profile on the track side A driver is provided, which is assigned to the route-side expansion profile.

A pair of clamping connections of the aforementioned type is known from DE-PS 2 547 407. Two clamping connections are provided at an overlap point, which are arranged at a distance from one another. The segments of multi-part expansion frames made of channel profiles are under very high tension in the overlap areas due to insertion, etc. These voltages must be absorbed by the connections. The segments of such expansion arches must, for. B. in the transitional area strut / line or when robbing the arches from each other.

In particular, the tension connection, which is assigned to the end face of the butt-side expansion profile, is subjected to strong tensions, while the tension connection, which is assigned to the end face of the track-side profile, is less loaded. This is due to the fact that under the effect of the stresses arising from the stress on the expansion frame, in particular bending stresses in the expansion level, a pair of forces is formed on a small lever arm with a tensile force component on the clamping connection which is assigned to the end face of the butt profile and with a compressive force component on the connection, which is assigned to the end face of the track-side expansion profile. Therefore, when the connections are removed, the connections assigned to the end face of the track-side profiles are first released. This can be done safely. If the screws of the connection assigned to the end face of the butt profile are now loosened, the last screw of this connection that has not yet been loosened is subjected to increased tension, u. U. To such an extent that the nut can be removed from the screw if it is only engaged with 1 to 2 threads with the screw. This does not represent a significant risk of an accident. The more severe the expansion profiles that must be used underground, the more this connection applies.

In order to avoid this disadvantage, it is known to use a robbery device which has a two-part robbery fork which is pivotably mounted in a traverse. A hydraulic cylinder with a bayonet lock can be used in the traverse. When the tensioning connection is released, the robbery fork is placed on the tab of the tensioning connection, while the piston of the hydraulic cylinder is supported on the route side on the half-clamp of the connection. By loading the hydraulic cylinder, the tension connection is relieved, so that the nuts can be safely removed from the screws. However, this known robbery device has the disadvantage that the robbery fork cannot be easily placed on the butt-side flap if warping material and rock pressed into the track do not allow this. In addition, the robbery device has a comparatively high weight and the application of hydraulic pressure to the cylinder requires a relatively long time, so that its handling is difficult, which often leads to the robbery fork not being used, but this is associated with considerable dangers.

From DE-U-1 816 715 a sliding, multi-part tensioning connection is known for the nested ends of gutter profiles of pit expansion frames that are supported flat against one another. This has a half-clamp that grips under the extension profile on the track side and a strap that bridges the extension profile on the butt end. Half-clamp and bracket are penetrated by the shafts of cylindrical fastening screws, on the ends of which clamping nuts are screwed, which are supported on the sides of the flanges of the half-clamps facing away from the butt-side expansion profile. The half clamp is of split design and its parts are releasably connected to one another in the areas of their division by means of screw bolts with screwed-on nuts. In one embodiment, the same double wedges are provided between the half-shells and the flanges of the section profile on both sides, while these can also be omitted in a further embodiment. The purpose of this tensioning connection is to provide a sliding connection for expansion frames, which enables the user to change the set pageant during operation, either to avoid that the pressure effects exerted on the frame cause an excessive narrowing of the cross-section of the stud or result in deformation of its components, or in order to adapt the resistance of the connections to the stresses to which they are exposed without having to remove them during operation. During operation, it is thus possible to pull the wedges out far enough to loosen the nut that unites the two parts of the half-clamp to give way to a large, temporary pressure from the building. As soon as this wears off, the wedges can be pushed in again and the aforementioned nut tightened again in order to produce the greatest sliding resistance.

Starting from this prior art, the invention has for its object to improve a pair of clamping connections of the type mentioned in such a way that this enables a safe release of the clamping connections without the use of special aids.

According to the invention, this is achieved in that at least the half-clamp of the clamping connection assigned to the end of the butt-side expansion profile consists of two parts which are detachably connected to one another in the areas of their contact surface, the contours of the half-clamps and track-side expansion profile touching and the passage openings in the tab are shaped such that, by loosening the two parts, a spreading movement of hook-head screws and half-clamp parts takes place, which enables a friction-restricted and limited slipping of the extension profile on the route side. This configuration ensures that the parts of the half-clamp gap after the connection between them has been loosened under the effect of the tension between the mutually lying ends of the track-side and butt-side expansion profile, the hook-head screws pivoting and the parts of the half-clip sliding upwards on the track-side expansion profile, whereby a not inconsiderable braking effect is achieved by the shape of the parts and, if applicable, their abutment (warping, rock). The junction of the two parts of the half-clamp is easily accessible, so that it can be loosened without being hindered by rocks or warpage. In addition, a special robbery device is no longer required, but only a tool to release the connection of the two half-clamp parts, which can be carried out in a simple manner.

The half-clamp is advantageously divided in half, so that both parts are identical and can be produced with the same tool. The subdivision is located in the central area of the floor of the track-side expansion profile, which is easily accessible.

According to a further feature of the invention, the parts of the half clamp in the areas of their division have mutually associated, stepped division surfaces which engage in one another in a form-fitting manner. This design results in a positive connection in every direction, so that the fastening means have not, or at most only slightly, been sheared.

According to another proposal by the Erfin. The parts of the half clamp are equipped in the areas of their division with protruding, mutually organized approaches that serve to attach the fastener or fasteners. The lugs can be flange-shaped and can be provided with through openings aligned with one another, into which one or more fastening means connecting the parts of the half clamp are inserted. Heavy-duty locking pins, screw bolts, eye bolts, etc., which can be secured by split pins, snap rings, etc., can serve as fastening means in this embodiment. However, it is also possible to shape the lugs of the two parts in such a way that they form a columnar or tubular body. At their lower edges, these have beads which complement one another to form a closed ring and are surrounded by one or more fastening means, for example in the form of clamp-like rings, etc.

The fasteners can be released from the secured area by pressing, pulling, blowing up, etc. the fasteners.

According to a further proposal of the invention, the entrainment of the hook screws has an approximately eyeglass-shaped outline, the two outer parts of which are arranged in a plane parallel to the plane of the central part, support surfaces for the hook head screws being provided in the recesses of the tab, which are in the central longitudinal axis of the recesses in the edge areas of the tabs merge into the edges of the recesses. This design of the tabs entails that after loosening the fasteners of the two parts of the half-clamp the hook-head screws can perform a pivoting movement, the free ends of their heads pushing further into the inner profile and their ends provided with the screws being opened both parts of the half clamp swing away from the expansion profiles.

• Fig. 1 in abgebrochener Darstellung eine Spannverbindung in Seitenansicht in bekannter Ausführung,
• Fig. 2 eine Vorderansicht der Fig. 1,
• Fig. 3 eine Vorderansicht der Halbschelle gemäß der Erfindung,
• Fig. 4 eine Draufsicht der Fig. 3,
• Fig. 5 eine Seitenansicht der Fig. 3,
• Fig. 6 eine Vorderansicht einer anderen Ausführungsform der Halbschelle,
• Fig. 7 eine Draufsicht der Fig. 6,
• Fig. 8 eine Seitenansicht der Fig. 6,
• Fig. eine Draufsicht eines Teils der Halbschelle,
• Fig. 10 eine Draufsicht der Lasche,
• Fig. 11 eine teilweise geschnittene Vorderansicht der Fig. 10 gemäß der Linie X-X der Fig. 10 und
• Fig. 12 eine Vorderansicht der Fig. 1, jedoch mit gelösten Teilen der Halbschelle.

An embodiment of the invention is explained in more detail with reference to the drawing, namely shows

• 1 is a broken view of a clamping connection in side view in a known embodiment,
• 2 is a front view of FIG. 1,
• 3 is a front view of the half clamp according to the invention,
• 4 is a plan view of FIG. 3,
• 5 is a side view of FIG. 3,
• 6 is a front view of another embodiment of the half clamp,
• 7 is a plan view of FIG. 6,
• 8 is a side view of FIG. 6,
• FIG. 1 shows a top view of part of the half clamp,
• 10 is a plan view of the tab,
• 11 is a partially sectioned front view of FIG. 10 along the line XX of FIG. 10 and
• Fig. 12 is a front view of FIG. 1, but with parts of the half clamp released.

The expansion profile facing the mountains is referred to as the impact-side expansion profile 1 and lies in the overlapping track-side expansion profile 2. The two profiles are congruent and are supported on one another in the area near the ground and on the webs generally designated 3 and 4. At their ends, the webs 3, 4 merge into the flanges 5 and 6.

At the overlap, the profiles are connected using the two clamping connections A and B. The tension connection A is assigned to the end face 7 of the butt-side expansion profile 1, while the tension connection B is assigned to the end face 8 of the track-side profile 2.

The tensioning connection A has a half-clamp 9 which grips under the extension profile 2 on the stretch side and a strap 10 bridging the extension profile 1 on the impact side. Half-clamp 9 and strap 10 are penetrated by the shafts of the fastening screws 11, which are designed as hook-head screws. Clamping nuts 12 are screwed onto the ends of the fastening screws 11, which are supported on the sides of the flanges 13 of the half-clamp 9 facing away from the butt-side expansion profile 1. The flanges 13 of the half clamp 9 rest on the undersides of the flanges 6 of the track-side expansion profile 2. The flanges 13 of the half clamp 9 and the outer regions of the tab 10 are provided with through openings, through which the fastening screws 11 pass.

In the case of the tensioning connection B, two drivers 14 are forged onto the half-clamp 9 'and bear against the end face 8 of the track-side expansion profile 2.

The effect of the drivers 14 of the half clamp 9 'of the clamping connection B corresponds to that of the driver 15 of the tab 10 of the clamping connection A, which bears against the end face 7 of the expansion profile 1 on the impact side.

The mode of operation of a connection consisting of the two tensioning connections A, B is known per se from DE-PS-2 547 407, to which reference is made to avoid repetition.

The connection according to the invention can be seen from FIGS. 3 to 9. Thereafter, the half-clamp 9 is divided, exactly half, so that the two identical parts 16 result. In the area of their dividing surface 17, the parts 16 are provided with a step 18, which results in a positive connection in each direction of the half-clamp 9. The step 18 does not have to run in a straight line so that identical half-clamp halves are provided.

The parts 16 of the half-clamp 9 are equipped in the areas of their division 17 with projecting, mutually associated lugs 19 which serve to connect the two parts 16 to one another.

In the embodiment according to FIGS. 3-5, the projecting lugs 19 are flange-like and are provided with aligned through openings 20, into which a fastener connecting the parts 16 is inserted, for. B. an eyebolt, which is not shown in detail.

In the embodiment according to FIGS. 6-8, the projecting projections 19 are shaped such that they form a columnar or tubular body, the cross section of which is approximately rectangular in the exemplary embodiment shown. At their lower edges, the lugs 19 have beads which complement one another to form a closed ring 21. The approaches 19 are of a fastener, not shown, for. B. a clamp-shaped ring or the like., Gripped so that the two parts 16 of the half-clamp 9 are connected to each other.

10 and 11 show the structure of the tab 10, which has an approximately eyeglass-shaped outline, so that a central bow-shaped section 22 can be distinguished from the two adjacent outer areas 23, 24. The bow-shaped section 22 lies in the main plane of the tab 10, while the outer regions 23, 24 are arranged in a plane parallel to the plane of the bow-shaped section 22, as can be seen in FIG. 11. In the middle section 22 and in the outer regions 23, 24, recesses 25, 26 are provided which are penetrated by the shafts and head regions of the fastening screws 11. In the recesses 25, 26 of the tab 10, support surfaces 27 are provided for the fastening screws, which merge into the edges of the recesses 25, 26 in the central longitudinal axis 28 of the recesses 25, 26 in the outer regions 23, 24 of the tab, i. H. run with these. This configuration of the support surfaces 27 gives the possibility of a pivoting movement for the fastening screws 11, as is explained in detail below with reference to FIG. 12.

After loosening the fastener, not shown, from or from the lugs 19 of the parts 16 of the half clamp 9, the tension connection A gapes apart and assumes the position shown in FIG. When the parts 16 of the half clamp 9 are spread apart, the fastening screws 11 perform a pivoting movement, the hook-shaped parts of which move further into the interior of the butt-side expansion profile 1, while the ends of the fastening screws 11 are pivoted away from the expansion profiles 1. At the same time, the nested ends of the expansion profiles 1, 2 stand out from each other while reducing their tension, so that there is a space between them.

It is particularly advantageous that the tensioning connection A according to the invention can be brought in the divided state for days, where it may need to be checked and disassembled the construction of the individual parts can be prepared for a new underground use.

During the gaping movement, the flanges 13 of the half-clamp 9 slide along the outer sides of the flanges 6 of the track-side expansion profile 2, so that there is a high braking effect due to the friction of these parts against one another, in particular due to the spreading apart, which results in a safe gaping apart of the parts 16 Half clamp 9 brings with it, furthermore also when warping material and rock lie close to the connections.

The loosening of the fastener, not shown, can be done from a secured field, with the possibility of equipping the connection point of the two parts 16 with a collecting basket, net or the like, so that one under tension of the nested ends of the expansion profiles, for example after loosening ejected bolt or the like can be caught.

Claims (9)

1. Pair of connecting strainers for interlocated reiprocally braced ends of channel-shaped mine-lining frames, of which the clamping connectors (A, B) comprise, engaging under the gallery-side lining profile (2) and bearing on the flanges (6) thereof, half-clamps (9, 9'), the flanges (13) of which are traversed by the shanks of hook-head bolts (11), the hook heads of which engage over the flanges (5) of the face-side lining profile (1) and bolted onto the ends of which are clamping nuts (12) which are braced on those sides of the flanges (13) of the half-clamps (9, 9') which are remote from the face-side lining profile (1), the clamping connector (A), which is associated with the end of the face-side lining profile (1) having, to bridge this, a cover plate (10) provided, for the hook heads of the bolts (11) of the clamping connector (A), with in each case a throughway aperture (25, 26) and with a drive member (15) associated with the face-side lining profile (1), a drive member (14) being provided on the halb-clamp (9') of the clamping connector (B) associated with the end of the gallery-side lining profile (2) and being associated with the gallery-side lining profile (2), characterised in that at least the half-clamp (9) of the clamping connector (A) which is associated with the face-side lining profile consists of two parts (16) which are separably connected to each other in the regions of their contacting face (17), the mutually contacting contours of half-clamp (9) and gallery-side lining profile (12) and the throughway apertures (25, 26) in the cover plate (10) being so formed that by separating the two parts (12), it is possible to bring about an opening-out movement of hook-head bolts (11) and half-clamp parts (16), permitting of a friction-inhibited and limited slipping of the gallery-side lining profile (2).

2. Pair of connecting strainers according to claim 1, characterised in that the half-clamp (9) is sub-divided into halves.

3. Pair of connecting strainers according to claim 1 or 2, characterised in that the parts (16) of the halb-clamp (9) have in the regions of their contacting face (17) mutually associated stepped portions (18) which engage into one another in a form-locking fashion.

4. Pair of connecting strainers according to claim 1 or one of the preceding claims, characterised in that the parts (16) of the half-clamp (9) are provided in the regions of their contacting face (17) with protruding and mutually associated lugs (19).

5. Pair of connecting strainers according to claim 4, characterised in that the lugs (19) are of flange-like construction and are provided with mutually aligned throughway apertures (20) into which are inserted one or more fixing means which connect to one another the parts (16) of the half-clamp (9).

6. Pair of connecting strainers according to claim 4, characterised in that the lugs (19) of the two parts (16) are so shaped that they form a column ortube-like member.

7. Pair of connecting streiners according to claim 6, characterised in that at their bottom edges, the lugs (19) have beads which supplement the lugs so that they form a closed ring (21).

8. Pair of connecting strainers according to claim 6 or 7, characterised in that the lugs (19) habe one or a plurality of fixing means engaging underneath them.

9. Pair of connecting strainers according to claim 1 or one of the preceding claims, characterised in that the cover plate (10) has a more or less spectacle-shaped plan view, the two outer zones (23, 24) being disposed in a plane parallel with the plane of the stirrup-shaped portion (22) and in that there are in the cut-outs (25, 26) of the cover plate (10) supporting faces (27) for the heads of the fixing bolts (11), which, in the central longitudinal axis (28) of the cut-outs (25, 26) in the marginal zones (23, 24) of the cover plate (10), merge into the edges of the cut-outs (25, 26).

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