Supporting method for underground soft rock roadway of coal mine
A roadway support and soft rock technology, applied in tunnels, shaft equipment, shaft linings, etc., can solve problems such as high cost, unreasonable input-output ratio, and inability to meet rapid construction, and achieve improved control and enhanced contact Effects of area and compactness
Inactive Publication Date: 2017-04-26
大唐陇东能源有限公司
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Problems solved by technology
The existing soft rock support technologies mainly include anchor net support technology, steel frame shed support technology, masonry support technology, pressure relief support technology, etc. These support technologies are used in the surrounding rock support of some soft rock roadways. It has been widely used in the field, but there are certain defects. The cost
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[0019] The specific implementation of a method for supporting a soft rock roadway in a coal mine is described in detail below with reference to the accompanying drawings. The embodiment is only used to illustrate the present invention and not to limit the scope of the present invention. All modifications in equivalent forms fall within the scope defined by the appended claims of this application.
[0020] Such as figure 1 , A method for supporting soft rock roadways in underground coal mines, including the following steps: (1) Bolt-net support: After digging or brushing and expanding the roadway, first use bolt-net support, and bolts with specifications of φ20mm×2200mm or φ20mm×2400mm, The material is left-handed non-longitudinal ribs and other strong rebar bolts. The anchor support plate is made of Q235 steel, with a specification of 150mm×150mm×8mm. The metal mesh is welded by steel bars with a diameter of φ6mm. The metal mesh must be close to the rock surface. The connection ...
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Abstract
The invention provides a supporting method for an underground soft rock roadway of a coal mine. The supporting method for the underground soft rock roadway of the coal mine is characterized by comprising the following steps of (1) supporting through an anchor net, specifically, after the roadway is tunneled or expanded through brushing, the anchor net is used for supporting the roadway firstly, and then end anchoring is conducted through an anchoring agent; (2) erecting of a steel support, specifically, U-shaped steel is machined into two or more round steel supports with the inner diameters being matched with the diameter of the roadway, an anchor rod and the steel supports are fixed through high-strength U-shaped clamping cables, and every two adjacent supports are connected through a pull rod; (3) concrete pouring, specifically, after the supports are mounted, a reinforcing mesh is laid on the inner edges of the supports, used air duct cloth is laid on the reinforcing mesh to serve as a formwork, concrete starts to be poured, and the concrete is compacted through vibration of a vibrating spear; and (4) back-filled grouting, specifically, a grouting anchor rod is arranged on a poured concrete outer wall with a round cross section in a punched mode. According to the supporting method for the underground soft rock roadway of the coal mine, cracks in surrounding rock are filled with cement paste after back-filled grouting is conducted, the surrounding rock is in an intact state again, the stability of the surrounding rock is enhanced, and supporting can be brought into play more effectively.
Description
technical field [0001] The invention relates to the technical field of mining, in particular to a method for supporting soft rock roadways in coal mines. Background technique [0002] The strength of the surrounding rock in the soft rock roadway in the coal mine is low, and most of them are expansive. After the roadway is excavated, it is easy to be seriously damaged under the action of the original rock stress and the mining stress. Under the condition of rich water, the surrounding rock is easy to expand and soften when it encounters water. The characteristics of the rock exacerbated its degree of damage, and the surrounding rock showed strong rheological characteristics. The existing soft rock support technologies mainly include anchor net support technology, steel frame shed support technology, masonry support technology, pressure relief support technology, etc. These support technologies are used in the surrounding rock support of some soft rock roadways. It has been w...
Claims
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Login to view more IPC IPC(8): E21D11/10E21D21/00E21D20/02
CPCE21D11/107E21D20/003E21D20/02E21D21/008
Inventor 蒋建设魏宝锋张少峰李永建沈浩
Owner 大唐陇东能源有限公司
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