FR2843991A1 - Device for fixing posts in ground has tube with spike at insert end and with reinforcing tension ring between flange part and tension plate with vertical tension slit - Google Patents

Abstract

The fixing device has a tube (2) with inner cylindrical opening (3) for the post which has at its lower insert end a spike (5) with several creases (6). A tension element comprising a reinforcing tension ring (12) of pressure and bending resistant material is mounted between a flange part (7) and tension plate (9) and has a vertical tension slit (13). At least one engagement side is formed as a cone with small tension angle and the second engagement side has a horizontal positive lock with the tension ring.

Description

Device for fixing in natural soil or in consolidated soil

  bar-shaped objects, for example tubular poles

Description

  The present invention relates to a device for fixing objects in the form of bars, for example tubular posts, in natural soil or in consolidated soil such as for example asphalt, concrete, packed gravel, in particular on an anchor. anchoring to the ground, with a tube (2), which has a cylindrical interior opening (3) for receiving the object (4) in the form of a bar and which has a point (5) at its lower end, directed in the direction of insertion, and at its upper end a collar portion (7) provided with a radially directed driving wall (8) with a clamping plate (9) which is arranged parallel to the collar portion ( 7), has a passage opening (10) and can be fixed to the collar portion by means of at least three clamping screws (11), and with an annular clamping element, which is arranged between the portion of collar (7) and the clamping plate (9), engages around the object (4) in the form of a bar and has two engagement sides (15, 21, 16) in the form of conical faces and / or stepped towards the

engagement side.

  The use of ground anchors and concreting sleeves is

widespread.

  Document WO 87/02734 A1 thus discloses a device of this type for fixing bar-shaped objects to the ground. It consists of a tube which is provided with a point at its front end, directed in the driving direction. A pot-shaped collar is provided in the region of the rear end of the tube. This device is, in the device described in document DE 196 07 972 C1 for receiving by fixing it a bar-shaped object, for example a post, supplemented by the fact that an elastic clamping element engaging around the post is placed between the part 30 forming a collar and the clamping plate, thus making it possible to obtain an adjustment of the

clamping the post.

  We also know, from the brochure of the firm Dambach, D-76571 Gaggenau, an anchoring sleeve which is used to receive, with tightening and possibility of rapid replacement, posts for road signs. This is a concreting sleeve which consists of a molded body, a thread being formed in the upper region, a thread below which is the seat for a tightening ring of the cuff type. After inserting a gasket, a kind of hollow pad is loosely screwed into the thread. After concreting and drying, the post is inserted as far as it will go in the hole of the hollow pad. The hollow pad is then tightened by means of a nut wrench, via its key flats, so that the clamping ring is pressed against the post and

subjects the latter.

  These concrete footings and sleeves meet user requirements

  as long as exceptional stresses are not taken into account.

  Such exceptional stress occurs when a vehicle collides with a road sign, or when the posts are deformed by acts of vandalism. With the devices of the firm Gebr. Strâb according to documents WO 87/02734 A1 and DE 196 07 972 Cl, this generates an offset of the clamping plate, which results in deformation and damage of the riveted nuts and, in the event of significant impacts, also deformation of the receiving opening in the collar

and therefore the collar itself.

  With the Dambach anchor sleeve, the impact causes the edge of the buffer nut to burst and, in the most severe cases, the molded body to be torn off. Another disadvantage when using plastic or rubber clamping rings is that plastics have the property of aging and creeping, a disadvantage which becomes particularly noticeable when torsional forces are encountered.

  act on the posts as well as in the event of significant temperature variations.

  The object of the present invention is to provide a device which, when driving in a post or engaging around a post, largely avoids damage to the ground anchor body and its fastening elements such as riveted nuts and tightening mechanism, and which allows repositioning

immediately of a new post.

  Resolution of the fixed goal The invention achieves this goal by a device characterized in that the clamping element is a clamping and reinforcing ring (12) of material resistant to pressure and to bending, which has a clamping slot. vertical (13), and in that the section of the ring (12) for tightening and strengthening, at the point of engagement (15) of the internal opening (3) of the collar (1) and of the support edge (16) of the clamping plate (9), has a flexural strength which corresponds at least to that of

  the object (4) enclosed in the form of a bar, in particular of a tubular post.

  Advantageous embodiments are that - the device is characterized in that at least one engagement side is produced in the form of a cone (14) with a small clamping angle (17) less than 20 and the second engagement side has a positive engagement with the clamping plate (9), or

  conversely the clamping plate (9) is made with a cone less than 20 and the second engagement side has a positive engagement with the collar (1).

  the device is characterized in that the tightening and reinforcement ring is preferably made of a material which does not tend to creep or become brittle under the effect of aging, such as steel, cast steel, sintered metal,

  brass, high-strength plastic or hard aluminum.

  - The device is characterized in that the clamping and reinforcement ring (12) is produced in the horizontal direction in the form of a symmetrical piece, which have

  identical clamping angles (17) forming a symmetrical double angle.

  - The device is characterized in that the upper region (18) of the clamping and reinforcement ring (12) is produced with a smaller section than on the support edge (16) of the clamping plate.

  - the device is characterized in that a thin segment (25) of protective casing is each time attached to the ring (12) for tightening and strengthening,

  segment which protrudes from the height "h" of the upper edge (19) of the clamping and reinforcement ring and surrounds the bar-shaped object above the ground surface (27).

  - The device is characterized in that the clamping and reinforcement ring (12) has a recess (21), in which the clamping plate (9) rests by

the passage opening (10).

  the device is characterized in that the depth of insertion of the clamping ring and of reinforcement in the clamping plate (9) is less than the thickness of the clamping plate (9), and the clamping plate present, in the upper region of the passage opening (10), a chamfer with a chamfer angle (24) of the order of magnitude of oc = 30 to 60. - The device is characterized in that the tightening and reinforcement ring can, by the insertion of the bar-shaped object, be deformed in the region located

above the support edge (16).

  - The device is characterized in that the clamping plate (9) has an outside diameter adapted to the outside contour of the collar.

  - the device is characterized in that the clamping plate (9) has a

curvature (26).

  The basic idea is to introduce, in the region of the interior opening of the collar, a conical clamping ring made of pressure-resistant material - preferably in

  steel-, which serves to reinforce this part and at the same time forms, upwards, a stable protection for the clamping plate, so that in the presence of transverse forces which come from the folded post, these forces are absorbed by the ring , the region of the collar and the clamping plate thus remaining stable and not deformed. Stability must come from the collar and be transmitted to the clamping plate.

  In both cases, a horizontal positive engagement is necessary.

  A conical bearing surface is therefore created in the interior opening of the collar for a tightening and reinforcement ring, in which the ring is inserted during assembly and can slide downwards. The clamping and reinforcement ring is activated by the clamping plate and produces, by clamping, a friction engagement between the post and the collar. As the clamping angle is less than 20 and can be adapted as required, the clamping forces are sufficient for a stable and torsion-resistant fastening in the area of road traffic. The inside diameter of the clamping ring is slightly larger than the outside diameter of the post, so that it can easily slide on the latter. It has a vertical slit which guarantees, despite the manufacture of the ring in pressure-resistant material, a capacity for deformation in bending or even a horizontal elasticity of a few millimeters. The clamping angle must be at least present on the flange side of the clamping and reinforcement ring. However, it is advantageous for the clamping and reinforcement ring to have symmetry

  vertical and horizontal. This allows any mounting direction.

  An additional advantage is obtained if the section of the clamping and reinforcing ring is designed so that the section is continued from the bending edge on the clamping ring to the upper end of the clamping ring. and reinforcement, but with a decreasing section, so that the part of the ring situated above the bearing edge against the clamping plate benefits from an additional recess and directs the radius of curvature of the post 10 upwards , while allowing a deformation of this part. In the presence of significant forces, the ring is then deformed at its upper end, and

thus constitutes a wearing part.

  A particularly advantageous configuration consists in combining the horizontal symmetry of the clamping and reinforcement ring with this additional reinforcement, so that a double cone is obtained. The protruding part of the clamping plate upwards protects the post against corrosion. This protection can be reinforced by bringing up a thin

  protective envelope segment, which is narrower than the gap.

  For pressure transmission, it is sufficient that, on the side of the clamping plate, a narrow height transmission surface acts on the clamping and reinforcing ring. This makes it possible to further shorten the lever arm, by practicing a

chamfer on the clamping plate.

  Possible materials are steel, cast iron, sintered metal, aluminum, brass

  as well as high strength plastics.

  The section of the clamping and reinforcing ring at the point of engagement of the upper edge of the interior opening of the collar and of the upper bending edge of the clamping plate has here a resistance to bending which is at least the same. order of magnitude as that of the section of the pole respectively enclosed.

  The invention will now be explained in more detail using several embodiments and the accompanying drawings, among which: FIG. 1 is an exploded representation of the device in front view, FIG. 2 is a half-section of the device in the region of the collar, the clamping plate and the clamping and reinforcement ring, FIG. 3 represents the upper part of the device in the assembled state, FIGS. 4 to 7 are enlarged detailed views of the Figure 2 in the region of the clamping and reinforcement ring. Figure 1 shows the structure of the device for fixing objects in the form of bars. The base consists of the tube with the collar and the riveted nuts. The collar has an interior opening which has a cone on the upper edge. 10 The clamping and reinforcement ring is located above; it is represented as a symmetrical piece. The slot is visible at the front. The clamping plate is located above the ring; it has approximately the same outside diameter as the collar. The clamping plate is slightly curved for reinforcement. It has countersinks for the screws, in order to obtain a flat surface. The bar-shaped object to be fixed is above. In the example, the clamping plate is fixed to the collar by four screws. The clamping ring is

  then activated, and clamps the bar-shaped object.

  FIG. 2 represents the assembled state of the collar and clamping plate part 20 of the device shown in FIG. 1, the screws not being retracted. The clamping and reinforcement ring is produced in the form of a symmetrical double cone and is mounted in a conical recess in the interior opening of the collar. The enlarged tube, the weld bead and the clamping and reinforcing ring form a stable reinforcement in the uppermost region of the collar, ie where the greatest bending forces occur. This reinforcement is transmitted over the region of the clamping plate which is located, at the level of the passage opening, only a few millimeters away from the surface of the collar, so that the lever arm during deformation of the bar-shaped object is kept as small as possible. The clamping plate is reinforced by a curvature and has, for a complete covering of the ground and maximum stability, the contour

outside of the collar body.

  Figure 3 shows in the closed state the device for fixing objects in the form of bars according to Figure 1. The clamping and reinforcement ring in the form of a double cone is here approximately flush with the upper face of the plate. Tightening. The retracted screws are, as in Figure 2, tightened so that the curved clamping plate rests on the edge of the collar, the tightened screws giving

  the clamping plate an internal prestress.

  Figure 4 shows in section the device for fixing objects in the form of bars.

  The clamping and reinforcement ring has a recess in which the clamping plate rests by its passage opening. The clamping plate has, in the upper region of the passage opening, a 10 oc angle chamfer, which gives free space to the folded post. A reverse execution, according to which the cone is placed in the clamping plate and the collar has a recess,

  is also possible but has not been shown.

  FIG. 5 shows a clamping and reinforcing ring in symmetrical execution, with identical clamping angles. The narrowed upper region shows that deformation is possible in this region when exercising a

horizontal force.

  FIG. 6 shows the same tightening situation as in FIG. 5, but by adding a segment of corrosion protection envelope of height "h".

  The thickness of this envelope is less than the gap between the collar and the post.

  FIG. 7 shows a tightening and reinforcement ring damaged by the action of a force. The clamping and reinforcing ring is deformed in the upper region. But the chamfer is large enough for additional deformation to be possible without coming up against the upper edge

  opening of the clamping plate.

  List of numerical references 1 device for fixing bar-shaped objects 2 tube 3 interior opening 3 4 bar-shaped object point 6 folds 7 collar-forming part 10 8 push-in wall 9 clamping plate passage opening 11 clamping screw 12 clamping and reinforcement ring 15 13 clamping slot 14 cone engagement point 16 support edge 17 clamping angle 20 18 upper region 19 upper edge gap 21 recess 22 screw hole 25 23 chamfer 24 chamfering angle envelope segment protection 26 curvature 27 ground surface

Claims (11)

claims   1. Device for fixing in natural soil or in consolidated soil objects in the form of bars, for example tubular posts, with a tube (2), which has a cylindrical internal opening (3) for receiving the object ( 4) in the form of a bar and which has a point (5) at its lower end, directed in the direction of introduction, and at its upper end a collar portion (7) provided with a driving wall (8) radially directed, with a clamping plate (9), which is arranged parallel to the collar part (7), has a passage opening (10) and can be fixed to the collar part by means of at least three clamping screw (11), and with an annular clamping element, which is arranged between the collar part (7) and the clamping plate (9), engages around the bar-shaped object (4) and has two engagement sides (15, 21, 16) in the form of conical faces and / or stepped towards the engagement side ement, characterized in that the clamping element is a clamping and reinforcing ring (12) of material resistant to pressure and bending, which has a vertical clamping slot (13), and in that the cross-section the clamping and reinforcement ring (12), at the point of engagement (15) of the interior opening (3) of the collar (1) and of the support edge (16) of the clamping plate (9), has a flexural strength which corresponds at least to that of the object (4) enclosed in the form of a bar, including a tubular post.   2. Device according to claim 1, characterized in that at least one engagement side is produced in the form of a cone (14) with a small clamping angle (17) less than 20 and the second engagement side has an engagement positive 25 with the clamping plate (9), or conversely the clamping plate (9) is made with a cone less than 20 and the second engagement side has a   positive engagement with the collar (1).   3. Device according to claim 1, characterized in that the tightening and reinforcement ring is preferably made of a material which does not tend to creep or become brittle under the effect of aging, such as steel, cast steel, sintered metal, brass, high-strength plastic or hard aluminum.   4. Device according to claim 1, characterized in that the clamping and reinforcement ring (12) is produced in the horizontal direction in the form of a symmetrical piece, which have identical clamping angles (17) forming a symmetrical double angle.   5. Device according to claim 3, characterized in that the upper region (18) of the clamping and reinforcement ring (12) is produced with a smaller section than on the support edge (16) of the clamping plate . 6. Device according to claim 1, characterized in that a thin segment (25) of protective envelope is each time attached to the ring (12) for tightening and reinforcement, segment which exceeds the height "h" of the edge   upper (19) of the clamping and reinforcing ring and surrounds the bar-shaped object 10 above the ground surface (27).   7. Device according to claim 1, characterized in that the ring (12) for tightening and strengthening has a recess (21), in which the   clamping plate (9) rests through the passage opening (10).   8. Device according to claim 7, characterized in that the depth of insertion of the clamping ring and of reinforcement in the clamping plate (9) is less than the thickness of the clamping plate (9), and the clamping plate has, in the upper region of the passage opening (10), a chamfering with a chamfering angle (24) of the order of magnitude of oa = 30 to 600.   9. Device according to claims 1 and 5, characterized in that the   clamping and strengthening ring can, by driving the object in the form of   bar, be deformed in the region above the support edge (16).   10. Device according to claim 1, characterized in that the clamping plate (9) has an outside diameter adapted to the outside contour of the collar. 25 11. Device according to claim 10, characterized in that the   clamping plate (9) has a curvature (26).