Resistance-stabilizing energy-absorbing glass glass reinforced plastic (FRP) anchor with pre-tightening force applying function
A glass fiber reinforced plastic and pre-tightening force technology, applied in the installation of bolts, mining equipment, earth-moving drilling, etc., can solve the problems of glass fiber reinforced plastic bolt damage, poor ductility, dynamic instability disasters, etc.
Inactive Publication Date: 2019-06-25
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, the ductility of conventional FRP materials (about 2%) is very poor, unlike steel, which has good plastic deformation ability (about 16%)
Therefore, due to poor ductility, conventional FRP bolts are prone to fracture and failure, which reduces the support quality of the coal wall of the working face
In addition, under the action of dynamic load in the mining stage, the coal side is prone to dynamic instability disasters, and conventional FRP bolts are more likely to be damaged
Method used
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[0017] figure 1 What is shown is the stable resistance energy-absorbing FRP anchor rod 200 of the present invention with the function of applying pretightening force.
[0018] figure 1 and figure 2 The specific structure of the energy-absorbing FRP bolt 200 provided in the embodiment with the function of applying pre-tightening force is shown. From figure 1 and figure 2 It can be seen from the figure that the high-strength, stable resistance and energy-absorbing fiberglass anchor rod 200 that can be preloaded includes a fiberglass rod body 210, a sleeve 220, a snap ring 230, an inner nut 211, a tray 240 and an outer nut 221.
[0019] Wherein, there is a section of thread on the outer periphery of the end of the fiberglass rod body 210 close to the surrounding rock, which is used for installing the inner nut 211 .
[0020] The inner wall of one end of the casing 220 is a bell mouth, and the outer wall is a threaded section; a non-slip sleeve 223 is provided at the opposi...
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The invention discloses a resistance-stabilizing energy-absorbing glass glass reinforced plastic (FRP) anchor with a pre-tightening force applying function, wherein an anchor body is made of glass glass reinforced plastic, the internal wall of one end of a sleeve is of a horn mouth shape, the outer wall is threaded, a plurality of steel balls are uniformly arranged around the outer circumference of a clamping ring and used to clamp an anchor body and the sleeve, the center of the disc surface of a tray is a circular hole, the diameter of the circular hole is adapted to the outer diameter of the sleeve. The relation between various components are listed as below: the sleeve sleeves the rear end of the anchor body, the horn mouth faces backward, the clamping ring is sleeved by the rear end of the anchor body and placed in the horn mouth of the sleeve, an internal nut is screwed into the threads of the anchor body, a tray sleeve sleeves the sleeve, an outer nut is screwed into the threadsof the outer wall of the sleeve, a reverse end of the horn mouth of the sleeve is provided with a non-slip sleeve. With the adoption of the tray and the outer nut, any pre-tightening force is provided for the anchor. With the adoption of a mechanical structure composed of the sleeve, the clamping ring and the FRP anchor body, stable-resistance extensible shaft support with a large stroke is realized when stable resistance is set at about 80% of the tensile strength of the anchor body.
Description
technical field [0001] The invention relates to a glass fiber reinforced plastic anchor rod in the coal side support of a coal mine roadway, in particular to a stable resistance energy-absorbing glass fiber reinforced plastic bolt with the function of applying a pretightening force. Background technique [0002] In view of the current situation and future development trend of deep mining and high-strength mining in coal mines, the traditional bolt support can no longer meet the support problems brought about by "three highs and one disturbance" and "large cross-section roadway". Therefore, the "high-strength, stable resistance and energy-absorbing" bolt has been vigorously developed in recent years. At the same time, considering that the pre-tightening force plays an important role in enhancing the overall stability of the roadway surrounding rock and reducing the tensile stress area of the surrounding rock, it is necessary to develop a high-strength stability resistance e...
Claims
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Inventor 吴宇郝阳李盼郝观
Owner CHINA UNIV OF MINING & TECH