Self-drilling rock anchor
Inactive Publication Date: 2008-11-20
HILTI AKITIENGELLSCHAFT
View PDF3 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0010]These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a rock anchor of the type discussed above in which the receptacle of the drilling head has a centering section that cooperates with a counter-centering section provided at the free end of the mixing member adjacent to the drilling head. In this way, the free end of the mixing member, which is located adjacent to the drilling head, as a result of the press-out process, upon being displaced, is automatically received in the drilling head receptacle. This takes place without use of a separate spacer or an additional guide member arranged in the receiving tube such as, e.g., a ramp. When the free end of the mixing member impacts an edge of the drilling head adjacent thereto, the mixing member, as a result of the shape of the free end thereof, upon continuation of the press-out process, is deflected in the receptacle of the drilling head. As soon as the free end of the mixing member occupies a proper position in the centering section of the receptacle of the drilling head, the mixed hardenable mass can flow through the through-opening in the drilling head and fill the space that surrounds the receiving body.
[0013]The manufacturing costs of the inventive rock anchor in comparison with the known rock anchor are reduced, which is an important advantage of such a mass-produced element. Despite this, a perfect use of the self-drilling rock anchor is insured.
[0014]Advantageously, the centering section of the receptacle of the drilling head has a funnel shape and tapers toward the free end of the drilling head. This shape of the centering section facilitates joint displacement with the free conical end of the mixing member tapering in a direction of the drilling head.
[0019]Preferably, a stop for the mixing member is provided in the receptacle of the drilling head, which limits the displacement of the mixing member. The stop is formed, e.g., as a circumferential rim provided in the receptacle of the drilling head in the direction of the free end of the drilling head adjacent to the centering section. The stop would limit the displacement of the mixing member during the press-out process. This insures that the end region of the free end of the mixing member is not deformed, during its displacement, to an extent that the discharge of the mixed, pressed-out mass is restricted.
Problems solved by technology
In this way, the need in an expensive hardenable mass is limited to the amount necessary to fill the space between the outer body and the bore wall.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025]A self-drilling rock anchor 11, which is shown in FIG. 1, has a hollow cylindrical receiving body 12, a drilling head 16 provided at a first, facing in the setting direction S, end 13 of the receiving body 12, and rotation application means 15, e.g., in form of a polygon connectable with a rotary drilling tool, and which is provided at an opposite, second end 14 of the receiving body 12. The drilling head 16 has a through-opening 17 and a receptacle 18 with a funnel-shaped centering section 20 tapering toward the free end of the drilling head 16.
[0026]In the receiving body 12, and inner tube 21 is arranged in which a pressable-out and hardenable mass 26, which is packed in a foil bag, is arranged. The inner tube 21 has an outlet opening 22 spaced from the drilling head 16. In the inner tube 21, between the hardenable mass 26 and the drilling head 16, there is provided a displaceably supported mixing member 31 in an end region of which at the free end 32 of the mixing member 31...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A self-drilling rock anchor includes a drilling head (16; 46) provided at one end (13) of the receiving body (12), an inner tube (21) for receiving a pressurable-out hardenable mass (26) and provided in the receiving body (12) and having an outlet opening (22) spaced from the drilling head (16; 46), and a mixing member (31; 61) displaceably supported in the inner tube (21), with the drilling head (16; 46) having a receptacle (18; 48) adjacent to the mixing member (31; 61) for receiving a free end (32; 62) of the mixing member (21; 61) and a through-opening (17) for the hardenable mass (26), and the receptacle (18; 48) of the drilling head (16; 46) having a centering section (20; 50) that cooperates with a counter-centering section (33; 63) provided at the free end (32; 62) of the mixing member (31; 61) adjacent to the drilling head (16; 46).
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a self-drilling rock anchor including a hollow cylindrical receiving body, a drilling head provided at one end of the receiving body, an inner tube for receiving a pressurable-out hardenable mass and provided in the receiving body and having an outlet opening spaced from the drilling head, a mixing member displaceably supported in the inlet tube, with the drilling head having a receptacle adjacent to the mixing member for receiving a free end of the mixing member and a through-opening for the hardenable mass.[0003]2. Description of the Prior Art[0004]Rock anchors are attachment elements which are used for stabilization of walls of hollow spaces such as tunnels, galleries, and the like and, in particular, for connecting rock regions adjacent to a wall with each other. In many cases, the regions which are located immediately adjacent to the wall and mechanical characteristics of which, in ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): E21D20/00
CPCE21D20/021E21D21/0033E21D2021/0053E21D21/0053
InventorBAYERL, MICHAELLUDWIG, WOLFGANGHEEMANN, KAY
OwnerHILTI AKITIENGELLSCHAFT