DE1987686U - INJECTION TIE ANCHORS. - Google Patents

Description

. ", _1a ^u Stuttgart, March 25th, 1968

Gymnasiumstr, 31B ° /

TgI. 0711/293133 Dr, W / kn

Re. s Utility model registration P / G 3435

Axihi. s Prof. Dr.-Ing. Arthur Scornfully

7 Stuttgart-Vaihingen
Döffinger Yieg 11

Injection tie rods

The innovation "relates to an injection tie rod in particular for permanent anchoring of supporting structures 0. Like. In the ground, in which one of a plastic hose or pipe enveloped prestressing steel is provided, its in the ground insertable end of one close to the plastic tube subsequent anchor foot is wrapped and fixed there.

Injection tie rods have already been proposed at which the risk of corrosion of the prestressing steels should be excluded. It has now been shown that the tension member in a known embodiment of an infection tie rod

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not in all cases after it has been introduced into the jacking pipe guided and held in a straight line in the force application area because the elastic plastic hose or the elastic plastic pipe reaching up to the anchor foot cannot guarantee perfect centering.

The present furnace avoids this factual part by that the anchor foot with a solid tubular extension piece is provided, which is approximately the length of the force application area owns and surrounds the prestressing steel. This embodiment is an advantageous development of the known Injection tie rods achieved which in the area of the later force application area an exact straight line guidance of the tension member allowed. After the pressed-in concrete jacket has hardened, there is no risk of undesired deflection forces occur in the tension member or bending forces in the concrete, which could lead to the formation of cracks. In addition, can be achieved be that the tension member is exactly centered within the concrete shell to lie-comes what a particularly favorable Eraft distribution on the ground enables. In the end it is also possible with the new design, at least to the. Part of the forces from the shell concrete on the adhesion between to transfer the concrete and the extension piece to the tension member, so that the pressure in the vicinity of the anchor foot can be kept lower.

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line advantageous embodiment results when the extension piece is designed as a steel tube seated tightly in the anchor foot via which the plastic hose at the upper end is pulled. This embodiment allows a simple and secure attachment, especially when the steel pipe is screwed into an anchor foot, which is preferably also made of metal s shape can be selected in such a way that its service life increases the service life of the supporting structure is adapted so that there are no disadvantages due to the use of metal as a material for anchor foot and anchor attachment piece = The tension members inside are in any case from corrosion protected because they are in a similar way, as with the subject of the main patent, with plastic compound within the Steel pipe and can be cast within the anchor foot.

The new design of the anchor foot allows it in particular advantageously, at the upper end of the extension piece or the steel pipe on which the plastic hose is tightly drawn, a known spacer to attach, for example, from two vertically ■ standing oval wire loops that can consist of the rohi-like extension piece are clamped on. This spacer made possible at. The subject of the present control is a perfect centric arrangement of the prestressing steels in the

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Area of the force transmission path within the gate drive pipe, because the tubular extension piece can be held centrally within the drive pipe at both ends by the anchor foot corresponding approximately to the diameter of the drive pipe and by the spacer located at the other end. This central position can be maintained during the compression of the concrete _s because the Vortreibrohr is known withdrawn gradually.

In the drawing, the subject of the innovation is shown using an exemplary embodiment.

Ji s ζ own 8

]? ig. 1 is a schematic side view of the new anchor foot for an injection tie rod, partly in section,

igo 2 the cross section through the tubular extension piece.des Anchor foot of Figo 1 and

lig. 3 arranged at the upper end of the tubular extension piece Spacers.

In the 3? Ig. 1 is the Änkerfuß 10 with a tubular extension piece 10a provided, which in this embodiment from

There is steel and is screwed into the anchor foot 10, which is also made of steel, with a thread 10b. The material of the anchor foot 10 and the steel tube 10a is that it has the same lifetime as the material of the support Bauwerkes to be supported by the new Ingektionszuganker ,, "The steel pipe Löa has approximately the" juänge selected so the later force introduction region It and can absorb about a third of the forces to be transmitted from the tension member 2a to the ground over its length due to the adhesion between the later pressed concrete and the Sohrwand. The second of the forces is transferred to the concrete shell via the anchor base 1O _5, in particular via the wedge-shaped surfaces 18 of the anchor base 10 the end of the tube has been pulled up.

Inside the steel pipe 10a and the plastic hose 9 run the individual tension wires 2a around a spacer coil 23 are arranged around centrally and between them an interior filled with plastic potting compound 14 also includes the rest of the seam 13 between the Tension wires 2a and the steel pipe 10a. is with plastic Potting compound filled. In the same way, the introduction opening 16 for the tension wires 2a is at the lower end of the anchor foot 10 filled with plastic potting compound, with

the embodiment shown, the tension wires 2a in one are clamped in the anchor foot 10 screwed 3?

At the upper end of the steel tube 10a is arranged a ATostandshalter the j _s in particular from the Pig. " 3 can be seen, consists of the two wire loops 22a and 22b which are arranged perpendicular to one another and which are clamped onto the steel tube 10a. This spacer, which has the same diameter as the anchor foot 10, allows after the introduction of the tension member into the ground together with the anchor foot a perfect centering of the steel pipe IGa and thus the tension wires 2a within the Yortreibrohres, so that after pressing the concrete and Pulling off the Yortreibrohres also ensures that the tensioning wires in the area of the force introduction section L are straight and arranged centrally within the concrete shell, üialenkkräf te within the tensioning wires 2a or bending forces in the concrete can therefore not occur after the injection tie rod has been inserted.

Claims (5)

1. Tension member for an injection tie rod, in particular for permanent "'anchoring of supporting structures o, the like., In Soil where one of a plastic hose or -pipe-coated- prestressing steel is provided, whose in the Soil insertable end encased by a tightly adjoining the plastic hose anchor foot and there is attached, characterized in that the Jjikerfuß (10) with a solid tubular extension piece. (10a) is provided j that 'is approximately the length of the force application area (L) and surrounds the prestressing steel (2a) » “Tension member according to claim 1, characterized in that the extension piece is designed as a steel tube ( 10a) which sits tightly in the anchor foot (10) and over which the plastic hose (9) is pulled. ο tension member according to claims 1 and 2, characterized in that that the steel tube (10a) is screwed into an anchor foot (10), which is preferably also made of metal is. 4. Tension member according to claim 1 and one of the other claims, characterized in that on the tubular extension piece a spacer on the end applied by the anchor barrel (10) (22a, 22Id) with the diameter of the Yorttsib tube is arranged. 5. tension member according to claim 4, characterized in that the spacer consists of two vertically aligned and clamped onto the tubular extension piece (10a) There are wire loops (22a and 22b) *