Anchor rod assembly and anchor rod pre-tightening device
A technology of bolts and components, applied in the installation of bolts, mining equipment, earth-moving drilling, etc., can solve the problems of difficulty in producing the expected preloading effect, loss of preloading force, etc., and reduce deformation recovery and deformation loss. , the effect of reducing the amount of deformation
Pending Publication Date: 2021-02-23
TIANDI SCI & TECH CO LTD
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Problems solved by technology
[0005] The present invention provides an anchor rod assembly and an anchor rod pre-tightening device, which is used to solve the problems in the prior art that the pre-tightening force of the anchor rod generated by tensioning and locking the anchor rod is prone to loss of pre-tightening force, and it is difficult to produce the expected pre-tightening effect Defects, to achieve the effect of reducing the deformation of the free section of the anchor rod, increasing the axial force of the anchor rod, and increasing the pre-tightening force by 25% to 40%.
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[0022] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.
[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The embodiments and simplified descriptions of the invention do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed a...
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The invention relates to the technical field of supporting, in particular to an anchor rod assembly and an anchor rod pre-tightening device, the anchor rod assembly comprises an anchor rod and a supporting accessory, the supporting accessory comprises a tray structure, an elastic piece and a lock, the tray structure, the elastic piece and the lock are sequentially arranged outside of the anchor rod in a sleeving mode in the axial direction of the anchor rod, one end of the elastic piece abuts against the tray structure, and the other end of the elastic piece is abutted against the lock. When the anchor rod is tensioned, a tensioning jack is connected with the anchor rod, tensioning force is provided, the anchor rod is stretched in the axial direction under tensile force, meanwhile, a surrounding rock body is subjected to compression force equal to the tensile force to generate compression deformation, when the anchor rod is locked, the lock locks the anchor rod, and at the moment, deformation of the elastic piece recovers rapidly, so that the surrounding rock body keeps the compression deformation generated in the tensioning process, the deformation recovery of the surrounding rockbody due to the change caused by the tension to the locking state is reduced, the deformation loss of the surrounding rock body is further reduced, the deformation amount of the free section of the anchor rod is reduced, the axial force of the anchor rod is improved, and the pre-tightening force of the anchor rod is improved by 25%-40%.
Description
technical field [0001] The invention relates to the technical field of support, in particular to an anchor rod assembly and an anchor rod pretensioning device. Background technique [0002] Bolt support is the main support form of coal mine roadway in my country, and it is one of the essential key technologies for high-yield and efficient production of coal mines. With the increase of coal mining depth, there are more and more difficult roadways. High-strength, high prestress and strong support technology are widely used in coal mines. Reasonable bolt pre-tightening force can increase the confining pressure of rock mass, which is beneficial to To maintain the stability of the surrounding rock of the roadway, the pre-tightening force of the bolt is the main parameter of the bolt support, and it is also an important indicator of whether the bolt material can play a role. Tensioning and locking the bolt is one of the effective means to increase the preload of the bolt. [000...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21D21/00E21D21/02
CPCE21D21/0026E21D21/008E21D21/0093E21D21/02
Inventor 吴志刚吴拥政张镇褚晓威王涛焦建康郝登云
Owner TIANDI SCI & TECH CO LTD