Resistance-increasing-type anchor rod

Abstract

The invention provides a resistance-increasing-type anchor rod. An anchor rod body comprises a resistance-increasing section connected with the anchor tail; the resistance-increasing section and the anchor tail are sleeved with a resistance-increasing device which can move relative to the rod body; the resistance-increasing device comprises a sleeve and a rubber cylinder; the rubber cylinder is closely attached to the outer circular surface of the resistance-increasing section, and the sleeve comprises a movable end which can move relative to the rod body; the rod body can penetrate through the sleeve, and the rubber cylinder is limited between the anchor tail and the movable end of the sleeve; the anchor rod further comprises a tray which is detachably mounted on the sleeve; and the trayis tightly pressed on the rock wall where the anchor rod is inserted when the anchor rod is anchored. The beneficial effects of the resistance-increasing-type anchor rod are embodied in that through arrangement of the resistance-increasing device, when surrounding rock deforms to a certain extent, the length of the anchor rod is increased, thus deformation in the surrounding rock can be released,the working resistance of the anchor rod is increased, and the stability of the surrounding rock is maintained again; and through matched arrangement of the movable end of the sleeve and the resistance-increasing section as well as the movable end of the sleeve and the rubber cylinder, when the surrounding rock deforms, the resistance-increasing device and the rod body relatively move so as to adapt to surrounding rock deformation.

Description

technical field [0001] The invention relates to the protection facility technology of civil engineering, in particular to a resistance-increasing anchor rod, which can be applied to support projects such as tunnels and slopes. Background technique [0002] The anchoring technology in geotechnical engineering is to use anchor rods or anchor cables to reinforce the rock mass. It fully exerts the stability of the rock and soil mass itself. It is a kind of small disturbance to the original rock, fast construction speed, safe and reliable. Cost-effective reinforcement technology. The bolt can actively strengthen the rock and soil mass, effectively control its deformation, and prevent the collapse and damage of the rock and soil mass. The many advantages of the bolt support technology have made the bolt support technology the main support method in the field of geotechnical engineering. [0003] However, if the surrounding rock of a deep buried tunnel or deep roadway has a large ...

AI Technical Summary

Problems solved by technology

However, the ultimate tensile length of the anchor bolts in the prior art is small. When the surrounding rock of the underground engineering undergoes a large deformation, the anchor bolt is often unable to adapt to the large deformation of the surrounding rock, and damage such as failure of the anchor head and breakage of the anchor bolt occurs, and then Cause landslides, roof falls and other accidents, and even cause the loss of underground engineering functions

The ideal anchoring effect cannot be achieved due to the inflexibility of the bolt itself and the small friction with the surrounding rock.

When the deformation of the surrounding rock gradually increases, due to the large tensile stiffness and poor shear resistance of the ordinary anchor, it cannot provide sufficient elastic deformation, resulting in problems such as the anchor being pulled away from the surrounding rock, the anchor being pulled off, and the pallet failing. , eventually lead to the failure of supporting equipment such as anchor rods, which will bring unpredictable damage to the project, and may cause major safety accidents in severe cases

[0004] Due to the low elongation rate of the anchor bar itself, it may be broken if a slight deformation occurs under the ultimate stress, and once the anchor is broken, the entire anchor support system will fail; Within the range, the bolt support resistance is also difficult to increase with the small deformation of the rod body, which still cannot meet the needs of the deformation of the surrounding rock.

Therefore, in order to avoid the occurrence of the above-mentioned geological disasters, how to provide a bolt that can adapt to the deformation of the surrounding rock within a certain range when the surrounding rock is deformed, overcome the problem of low elongation of the bolt, and make it play a good role. The supporting effect is an important technical problem that needs to be solved

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