Double-pull bolt and its supporting method for small coal pillars in gob-side excavation
A technology of small coal pillars and bolts, which is applied to the installation of bolts, earthwork drilling, mining equipment, etc., and can solve the problem of uncoordinated support system and coal pillar deformation, failure to consider large deformation characteristics, and failure of support structures and other issues to achieve the effect of strong promotion and application value, strong practicability, and guaranteed safety and stability
Active Publication Date: 2017-11-10
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
However, these support methods do not take into account the large deformation characteristics of small coal pillars in gob-side excavation, which makes the support system and coal pillar deformation inconsistent, resulting in failure of the support structure and the final overall failure of the coal pillar. Improvement and development are urgently needed for the support device and method of small coal pillars in roadway
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[0020] Such as Figure 5 As shown, a pair-pull type bolt used for small coal pillars in goaf excavation, which consists of an intermediate tie rod 15, two rubber stopper valves 17 sleeved on the middle tie rod 15, and symmetrically connected to both ends of the middle tie rod 15. Large deformation device, and supporting nut 9 and tray 10;
[0021] Described large deformation device comprises sleeve 13, high-strength compression spring 16, fastening bolt 12 and connector 14; Image 6 As shown, the bottom end of the above-mentioned sleeve 13 is provided with a back cover with a through hole 18, and the open end is provided with an internal thread; as Figure 7 As shown, one end of the above-mentioned connector 14 is provided with an external thread connected with the open end of the sleeve 13, and the other end is provided with an internal thread connected with the middle tie rod 15; the above-mentioned high-strength compression spring 16 is loaded into the sleeve 13, and then ...
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The invention discloses a pair-pull anchor rod for small coal pillars in goaf excavation and a supporting method thereof. The middle pull-type anchor rod is provided with two rubber stopper valves at intervals on the middle tie rod. A grouting hole is provided on one of the rubber stopper valves; a large deformation device with the same structure and supporting trays and nuts are symmetrically connected to both ends of the middle tie rod; the large deformation device includes a bottom cover with a through hole at one end, The other end is an open end sleeve, a high-strength compression spring, fastening bolts and connecting pieces; the open end and the connecting piece, and the connecting piece and the intermediate tie rod are all threaded; a high-strength compression spring is installed in the sleeve, and the fastening bolt passes through The threaded head of the high-strength compression spring is exposed from the through hole at the bottom of the sleeve; when using this bolt support, the support method of grouting in the middle and pre-tightening at both ends is formed for the small coal pillar, which not only adapts to the large deformation of the coal pillar , and ensure the safety and stability of the coal pillar.
Description
technical field [0001] The invention relates to the support technology of coal mine recovery roadway, in particular to the support technology of small coal pillars along goaf roadway. Background technique [0002] In the process of coal mining, gob-side entry has good technical advantages and economic benefits. It not only effectively alleviates the tension of mine working face replacement, but also significantly improves the recovery rate of coal resources. It is of great significance to the realization of safe and efficient modern mining in coal mines. However, due to the structural evolution of the overlying strata and the strong disturbance of mining, small coal pillars in gob-side excavation are severely damaged, deformed, and poor in stability. As the service time of the roadway increases, the bearing capacity of the coal body gradually decreases. The support problems include: The lateral deformation of small coal pillars is large, and slabs occur from time to time; ②T...
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IPC IPC(8): E21D21/00E21D20/02
CPCE21D20/02E21D21/00
Inventor 赵同彬张玉宝张连生
Owner SHANDONG UNIV OF SCI & TECH