Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1988-06-27
1989-11-21
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405150, E21D 1700
Patent
active
048818534
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates in general to mining and in particular to a new and useful mine support section for a mine and tunnel support, comprising two I-sections, whose abutting inner flanges are joined together to form a box section.
There are various known support sections for the supports of mines, especially support of the face and the headway, which are able to perform the function of roof timbers and binding beams. This includes the preferred web sections, such as I-sections, trough sections and box sections, although the trough sections are used as a rule for gallery arches. During the process of their installations, either the sections must be supported by props or, when rock bolts are employed, it is necessary to suspend the sections from the hanging wall by means of butt straps reaching underneath the sections. Generally, the sections are joined together by butt straps which reach around and lie outside of the abutting ends. The props which are to be installed, like the butt straps, are a hindrance, for various reasons. Apart from the outlay of material, the props interfere with the making of upward and downward cuts, for example. The same applies to the sufficient propping of the transition from working face to gallery, particularly in the area of the machine room, as the props here curtail the space available for installation of drive units of the conveyors and excavating machinery. Finally, the continual laying and removing of props to support the binding beam sections in the area of the gallery parallel dam is expensive and bothersome. The underpinning of the support sections and their joining by means of butt straps arranged on the outside is a hindrance, since the sections are no longer suitable for use as running rails for transportation of machinery and materials, if need be. The invention proposes to remedy this.
SUMMARY OF THE INVENTION
The invention provides a support section for a mine and tunnel support which can be installed free of support, which enables an add-on of additional sections at the ends without exterior butt straps; and which can be used consequently as running rails.
According to the invention, a support has a box section with installation recesses in its upper I-flange and in its lower I-flange. The installation recesses are arranged at selected intervals on the central axis of the I-flanges; and the upper and lower installation recesses intersect each other, at least in vertical projection. In accordance with the invention, a box section is used as the support section, which can be adequately secured to the rock and especially to the hanging wall by means of rock bolts, e.g. expanding sleeve bolts, cement mortar bolts, or bolts embedded in plastic mortar. For this, the bolts can be installed through the installation recesses. Consequently, the support section of the invention can be installed without supports or propping, in either the lengthwise or the transverse direction of the face and the galleries. In addition, it is possible to join the section to its neighbor in the area of the abutting ends without an external butt strap. This is because the joining fixtures can be accommodated in the hollow spaces of the box sections being joined and, they can be locked after insertion in the hollow spaces via the installation recesses.
Inasmuch as the installation of the support section of the invention is done without supports or propping, there is now sufficient room available for unimpeded installation of conveyors and excavation machinery while making upward or downward cuts, as well as for installation of machine rooms, while the laying and removing of props is eliminated during production of gallery parallel dams. Furthermore, the support sections of the invention can be arranged one above the other and locked in the area of the installation recesss, regardless of whether the support sections are intersecting or parallel.
It is also possible to install suspension devices in the lower installation recesses of the centrally bolted
REFERENCES:
patent: 2749713 (1956-06-01), Paurat
patent: 2780067 (1957-02-01), Jacobi et al.
patent: 3076672 (1963-02-01), Heintzmann et al.
patent: 3163011 (1964-12-01), Groetschel
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