DE202009006707U1 - Clamp connection for U-shaped profile segments - Google Patents

Abstract

Clamping connection (4) for U-shaped profile segments (2, 3) of the resilient underground construction (1), which has a top flap (10) with hook-shaped hook-in flanges (16), a bottom flap (11) with lateral straight flanges (26) and recesses (24, 25) in the Einhängeflanschen (16) and clamping flanges (26) passing through threaded bolts (12) and on the bolts (12) rotatable nuts (13), characterized in that the upper flap (10) between the lateral Einhängeflanschen (16 ) has a retracted middle longitudinal section (14) and between the central longitudinal section (14) and the Einhängeflanschen (16) to the Einhängeflanschen (16) in opposite directions curved locking portions (15).

Description

The The invention relates to a clamping connection for U-shaped profile segments of the yielding underground Expansion according to the characteristics in the preamble of claim 1.

One compliant underground Expansion with U-shaped Profile segments (in a mine or tunnel) is in Form of a bow or ring expansion known. In addition, such an expansion count Support from at least two profile segments. Regardless of the type of expansion (sheet or ring removal, expansion posts) have the essentially U-shaped Profile segments each two curved legs, one connecting the legs Web and two arranged on the web remote from the ends of the legs, sideways directed flanges, which also called ears because of their shape become. In the overlap area of two consecutive profile segments, these become intertwined nested, with the ears of the encompassing profile segment in throats of the inlaid profile segment support, which there on the ears are formed.

The Tensioning of the profile segments in the overlapping area with the help of at least two clamping connections, each clamping connection from a top flap with side hook-shaped hook-in flanges, a bottom flap with lateral straight clamping flanges and recesses in the suspension flanges and clamping flanges penetrating bolts and on the bolts rotatable nuts. While the bottom flap formed largely U-shaped is and next to the side clamping flanges thighs and a the Leg having connecting web, wherein in the transition region of the clamping flanges are provided on the thigh ridges, which are in throats of the Supports ears of the encompassing profile segment, there is the top flap from a straight middle length section as well as to this length section end subsequent hooked Einhängeflanschen. The bolts are with their appropriately adjusted heads in these suspension flanges inserted and enforce with their shanks recesses in the suspension flanges and in the clamping flanges of the bottom flap. With the help of the threaded sections of the bolts turned nuts then the suspension flanges of Upper flap and the clamping flanges of the lower flap pulled against each other, the beads of the lower flap being in the throats of the ears of the embracing Profile segment pressed and the top flap with the transition sections between the middle length section and the suspension flanges the ears of the embedded profile segment overlaps.

Of the Frictional resistance between the overlapping nested profile segments is partially defined over and partly over undefined pressure areas generated from the normal force of the bolt. This is about the Contact areas of the upper flap with the ears of the inserted profile segment an additional one creates lateral pressure, the higher insertion resistance of Profile segments ensured when occurring rock load.

This However, insertion resistance must be dependent on the tolerances the profile segments and also their widths - measured over the outer sides of the ears - considered become. He is only really effective when the transition areas the upper flaps with the ears of the inserted profile segment in a perfect contact. Due to various processing steps, such as tempering, Bending of long strands of profile to a length of for example 8 m cut to length Profile segments can be the width of the profile segments in certain Borders vary. This has the consequence that a clamping connection with a top flap and bottom flap so far have a defect that can be the transition areas between the middle length section a top flap and the suspension flanges not every profile size perfect contact with the outer surfaces of the Have ears, so that the insertion resistance is not the desired Safety can be determined.

Of the Invention is based on the object, a clamping connection for U-shaped profile segments of the yielding underground To create expansion, in which the determined by the upper flap Insertion resistance is guaranteed even then can be when the widths of the profile segments of the nominal size considerably differ.

The solution This object is according to the invention in the features of the claim 1.

advantageous Further developments of the invention are subject matter of claims 2 to 7th

The upper flap should now have between the lateral Einhängeflanschen a retracted central longitudinal section and between the central longitudinal section and the Einhängeflanschen to the Einhängeflanschen oppositely curved locking sections. These latching sections comprise with their inner surfaces the ears of the inserted profile segment. Depending on the actual width of a profile segment, either the mutually facing inner surfaces of the latching sections now lie against the outer surface regions of the ears or the inner surfaces of the latching sections facing away from one another are located on the mutually facing surface areas of the ears. When tightening the nuts thus always the desired insertion resistance can be ensured because the forces exerted by the bolts forces are always transmitted to a surface region of the ears of the inserted profile segment. This improved power transmission is supported by the fact that the upper flap is stiffer due to the retracted middle length.

It has proven to be advantageous if the middle length section the top flap between the curved locking portions straight extends.

Of the Insertion resistance is further improved by the fact that the middle length section of the Upper flap is retracted by about the thickness of the upper flap.

Further can at the bottom of the concave inner surfaces the latching portions pockets may be formed. Secure the bags a perfect investment of the outer surfaces of the Ears of the inserted profile segment on the concave inner surfaces of Latching sections. The transverse to the upper flap pockets can have oval contours.

Of Furthermore, it is appropriate that the convex outer surfaces of the Locking sections are provided with frontal chamfers.

Around also the bottom flap with regard to the bulges between the lateral ones Clamping flanges and thighs a perfect investment in the To secure throats of the encompassing profile segment are the beads provided with central recesses. In this way, they are next to you The recesses lying areas of the beads properly in the throats the ears of the encompassing profile segment.

The Invention is illustrated below with reference to the drawings embodiments explained in more detail. It demonstrate:

1 a section of an underground arch expansion in the area of two overlapping profile segments;

2 a cross section through the representation of 1 along the line II-II seen in the direction of the arrows II a;

3 the representation of 2 in a sheet removal with narrower profile segments;

4 a top flap of a clamp connection of the sheet expansion in the front view;

5 a plan view of an end portion of the upper flap of 4 seen in the direction of the arrow V;

6 a side view of the upper flap of 4 seen in the direction of the arrow VI;

7 an end view of a lower flap of a clamping connection of the sheet structure of 1 and

8th a side view of the bottom flap of 7 seen in the direction of arrow VIII.

In the 1 is a longitudinal section of a compliant underground arcuate extension 1 shown, which can be used in mining or tunneling. The expansion 1 consists of several identically formed profile segments 2 . 3 , Two each in the circumferential direction UR of the expansion 1 successive profile segments 2 . 3 be according to the presentation of the 1 and 2 placed in each other and in the overlapping area B by means of two spaced-apart clamping connections 4 so braced together that at mountain loads the tense profile segments 2 . 3 can be relatively limited to each other, with a shortening of the expansion 1 takes place in the circumferential direction UR.

The profile segments 2 . 3 are identical and each have a U-shaped cross-section, consisting of two curved legs 5 , one the thighs 5 connecting footbridge 6 and two at the footbridge 6 opposite ends of the legs 5 arranged ears 7 composed. The ears 7 are directed sideways outward and have a the bridge 6 remote convex surface area 8th as well as the footbridge 6 facing concave area in the form of a throat 9 , especially the 2 shows that the nested profile segments 2 . 3 support each other in such a way that the convex outer surfaces 8th the ears 7 of the encompassing profile segment 2 in the throats 9 the ears 7 of the inner profile segment 3 lie.

The clamp connections 4 for the nested profile segments 2 . 3 each consist of one's ears 7 of the engaging profile segment 3 overlapping upper flap 10 , one the encompassing profile segment 2 encompassing bottom flap 11 as well as two lateral bolts 12 and nuts 13 ,

Every one of the 4 to 6 in detail resulting upper flap 10 has a straight middle length section 14 , two at this length section 14 subsequent arcuate curved locking sections 15 as well as two lateral ha kenförmige Einhängeflansche 16 on. The resting sections 15 are to the suspension flanges 16 curved in opposite directions. It's the 4 to deduce that the middle length section 14 about the thickness D of the upper flap 10 is retracted in the direction of a plane EE, which the convex surfaces 17 the suspension flanges 16 affected.

At the bottom of the concave inner surfaces 18 the resting sections 15 are bags 19 formed, extending across the top flap 10 extend and have oval contours ( 4 and 5 ).

The convex outer surfaces 20 the resting sections 15 are with front chamfers 21 Mistake ( 4 to 6 ).

As the 1 and 2 clearly show possess the bolts 12 heads 22 , which are the insides of the suspension flanges 16 Contour-matched and with their shafts 23 recesses 24 in the suspension flanges 16 and 25 in clamping flanges 26 the bottom plates 11 (see also 7 and 8th ) push through.

The bottom flaps 11 the clamp connections 4 are U-shaped ( 2 . 3 . 7 and 8th ) and indicate at the transitions from the lateral straight clamping flanges 26 on curved, by means of a bridge 27 connected thighs 28 beads 29 on, the upper flap 10 are facing. These beads 29 take in the throats 9 of the encompassing profile segment 2 ,

Furthermore, the show 7 and 8th that center of these beads 29 recesses 30 are provided, so that the beads 29 only with the end sections in the throats 9 lie.

Get profile segments 2 . 3 with a larger profile width PB used, as it is in the 2 is shown, it can be seen that when tightening the bolts 12 with the help of nuts 13 an additional frictional resistance between the upper flap 10 and the ears 7 of the engaging profile segment 3 is constructed by the facing areas of the inner concave surfaces 18 the resting sections 15 on the opposite surface portions of the ears 7 according to the arrows PF to the plant.

Will the same clamp connection 4 in profile segments 2 . 3 with smaller profile widths PB1 applied ( 3 ), it can be seen that when tightening the bolts 12 with the help of nuts 13 then the opposing inner concave surfaces 18 the resting sections 15 with the opposite convex surface areas 8th the ears 7 of the engaging profile segment 3 come into contact (arrows PF1).

Otherwise, the embodiment corresponds to 3 that of the 2 , so that can be dispensed with a repeated explanation.

1

expansion

2

encompassing profile segment

3

engaging profile segment

4

clamp connections

5

Thighs v. 2 . 3

6

Bridge v. 2 . 3

7

Ears v. 2 . 3

8th

convex surfaces V. 7

9

Throats v. 7

10

top flap

11

under tab

12

bolts

13

nuts

14

middle section v. 10

15

Rest sections v. 10

16

Hook-on flanges v. 10

17

convex surfaces v. 16

18

concave inner surfaces v. 15

19

Bags in 18

20

convex outer surfaces v. 15

21

Chamfers on 20

22

Heads v. 12

23

Shafts v. 12

24

Recesses in 16

25

Recesses in 26

26

Clamping flanges v. 11

27

Bridge v. 11

28

Thighs v. 11

29

beads

30

Recesses in 29

D

Thickness v. 10

E-E

Level 17

PB

profile width

PB1

profile width

PF

arrows

PF1

arrows

UR

Circumferential direction v. 1

B

overlap area

Claims (7)

Clamp connection ( 4 ) for U-shaped profile segments ( 2 . 3 ) of yielding underground construction ( 1 ), which a top flap ( 10 ) with lateral hook-shaped hook-in flanges ( 16 ), a bottom flap ( 11 ) with lateral straight clamping flanges ( 26 ) and recesses ( 24 . 25 ) in the suspension flanges ( 16 ) and clamping flanges ( 26 ) passing through bolt ( 12 ) and on the bolts ( 12 ) rotatable nuts ( 13 ), characterized in that the upper flap ( 10 ) between the lateral suspension flanges ( 16 ) a recessed middle length section ( 14 ) and between the middle section ( 14 ) and the Hook-in flanges ( 16 ) to the suspension flanges ( 16 ) oppositely curved locking portions ( 15 ) having. Clamping connection according to claim 1, characterized in that the central longitudinal section ( 14 ) of the upper flap ( 10 ) between the curved latching sections ( 15 ) extends in a straight line. Clamping connection according to claim 1 or 2, characterized in that the central longitudinal section ( 14 ) of the upper flap ( 10 ) by about the thickness (D) of the upper flap ( 10 ) is recovered. Clamping connection according to one of claims 1 to 3, characterized in that at the bottom of the concave inner surfaces ( 18 ) of the latching sections ( 15 ) Bags ( 19 ) are formed. Clamping connection according to claim 4, characterized in that the transverse to the upper flap ( 10 ) extending pockets ( 19 ) have oval contours. Clamping connection according to one of claims 1 to 5, characterized in that the convex outer surfaces ( 20 ) of the latching sections ( 15 ) with frontal bevels ( 21 ) are provided. Clamping connection according to one of claims 1 to 6, characterized in that the U-shaped lower flap ( 11 ) at the transition from the clamping flanges ( 26 ) on the thighs ( 28 ) with the upper flap ( 10 ) facing beads ( 29 ) is provided, the center of a recess ( 30 ) exhibit.