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Method for fastening anchoring means and device suitable for this purpose

a technology of fastening means and anchoring devices, which is applied in the direction of fastening means, mechanical equipment, mining structures, etc., can solve the problems of long cure time and vice versa

Inactive Publication Date: 2005-05-12
HILTI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] Surprisingly, it has turned out that it is possible to initiate or bring about the curing of the curable mortar composition by passing microwave energy over the component into the curable mortar composition present in the borehole.

Problems solved by technology

This means that, when the pot life of the curable mortar composition is long, the curing time is also long and vice versa.
The problems, which arise when anchoring means are fastened in boreholes, are not disclosed in any publication.

Method used

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  • Method for fastening anchoring means and device suitable for this purpose
  • Method for fastening anchoring means and device suitable for this purpose
  • Method for fastening anchoring means and device suitable for this purpose

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] The two components of a curable, two-component mortar composition are prepared from the following constituents:

Component A:

[0036] 30.0% epoxide resins based on bisphenol A (Araldit GY 250) [0037] 20.0% butylene glycol diglycidyl ether [0038] 50.0% powdered quartz

Component B: [0039] 40.0% oligomeric Mannich base [0040] 20.0% triethylenetetramine [0041] 40.0% powdered quartz

[0042] After the two components A and B are prepared by mixing the individual constituents, they are mixed in a ratio above volume of 3:1 with the help of a static mixer. The curable mortar composition, obtained in this way, has a pot life at room temperature of about 30 minutes. The mortar composition is then brought into a borehole, which is drilled with an internal diameter of 14 mm and a depth of 130 mm in concrete of quality C20. The anchor rod, with an external diameter of 12 mm, is then introduced into the borehole, the adapter unit is connected frictionally over the collet chuck with the end of...

example 2

[0044] A curable two-component mortar composition is prepared from the following constituents.

Component A:

[0045] 20.0% polyurethane methacrylate [0046] 30.0% trimethylolpropane trimethacrylate [0047] 43.0% quartz sand [0048] 5.0% of the above microcapsules [0049] 2.0% pyrogenic silica (Cab-O-Sil R 202)

Component B: [0050] 40.0% benzoyl peroxide / phthalate paste (50% BPO) [0051] 20.0% di-isobutyl phthalate [0052] 37.0% powdered quartz [0053] 3.0% pyrogenic silica

[0054] The microcapsules, contained in Component A, where formed by encapsulating diethylaniline and carbon black (Vulcan XC72R) jointly in a melamine resin. These microcapsules have a diameter of 1 to 150 μm and the following composition: [0055] 35% of the microcapsule wall material (melamine resin) [0056] 60% of diethylaniline [0057] 5% of carbon black (Vulcan XC 72R)

[0058] The two components A and B are mixed in a ratio by volume of 7:1 with the help of a static mixer and form a curable mortar composition with a pot l...

example 3

[0059] A curable one-component mortar composition is prepared from the following constituents: [0060] 50.0% pentaerythritol tetraacrylate [0061] 24.0% polyurethane hexaacrylate (Craynor 975) [0062] 3.0% pyrogenic silica (Aerosil TS 720) [0063] 5.0% tetrabutylammonium persulfate [0064] 1.0% 1,3-di(2-t-butylperoxy isopropyl)benzene (DIPP-2) [0065] 15.0% quartz sand [0066] 1.5% ferromagnetic mixed oxides (Bayferrox 318 M) [0067] 0.5% conductive carbon black (Vulcan XC72 R)

[0068] The curable mortar composition obtained, with a pot life at room temperature of more than two weeks, is introduced into the borehole as a single component in the manner described in Example 1, the anchor rod is set, the adapter unit is arranged and microwave radiation with a power of 500 W is passed for 30 seconds over the anchor rod into the curable mortar composition. A load value of the anchor rod of 44 kN is achieved after insolation lasting 15 minutes.

[0069] It can be seen from the above examples that, w...

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PUM

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Abstract

A method is described for fastening anchoring means, especially anchor rods, reinforcing iron, etc. in solid substrates by introducing a curable mortar composition and the anchoring means into a borehole provided in the solid substrate and curing the mortar composition, the curing of the mortar composition being initiated or brought about by introducing microwave energy over the anchoring means into the borehole. Furthermore, a device is described for carrying out this method, the device having an adapter unit (1), which can be connected over a coaxial cable or a waveguide (2) with the microwave generator, and a collet chuck (3), for frictionally fixing the adapter unit to the anchoring means (4) and for passing microwave energy into the mortar composition (7) present in the borehole (5) of the solid substrate (6), and a shielding (8), surrounding the collet chuck (3).

Description

1. BACKGROUND OF THE INVENTION [0001] 1. Field of Invention [0002] The present invention relates to a method for fastening anchoring means, especially anchor rods, reinforcing iron, etc. in solid substrates such as concrete or masonry, by introducing a curable mortar composition and the anchoring means into a borehole, which is provided in the solid substrate, and curing the mortar composition, as well as to a device for carrying out this method. [0003] 2. Description of the Prior Art [0004] Normally, in order to fasten anchoring means such as anchor rods, reinforcing iron or similar elements in a borehole in solid, mineral substrates, such as concrete or masonry, curable mortar compositions, especially two-component mortar compositions based on (methh)acrylates or epoxide resins are used. After the components of the curable mortar composition, which react with one another, are mixed, these curable mortar composition have a certain pot life, during which the element, which is to be ...

Claims

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Application Information

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IPC IPC(8): E21D20/02F16B13/14
CPCF16B13/141E21D20/02
Inventor HETTICH, RAINERBUERGEL, THOMASSCHAEFERS, KLAUSLEIBHARD, ERICH
Owner HILTI AG