Anchor rod capable of adapting to surrounding rock deformation

Abstract

The invention provides an anchor rod capable of adapting to surrounding rock deformation. The anchor rod comprises a rod body and a tray. The rod body comprises an extending section connected with theanchor tail. An extending device capable of moving relative to the rod body is mounted on the extending section and the anchor tail in a sleeving mode. The extending device comprises a sleeve and a spring. The sleeve comprises a movable end capable of being used for moving relative to the rod body. The spring is limited between the anchor tail and the movable end of the sleeve. The tray is detachably mounted on the sleeve. The tray is tightly pressed on the rock wall where the anchor rod is inserted when anchoring of the anchor rod is completed. The anchor rod has the beneficial effects thatthrough arrangement of the extending device, the effects that when surrounding rock is subjected to certain deformation, the length of the anchor rod is extended, so that deformation in the surrounding rock can be released, after the anchor rod extends, the working resistance of the anchor rod can be increased, and stability of the surrounding rock is maintained again are achieved; and through matching arrangement of the movable end of the sleeve and the spring of the extending section, the effect that during surrounding rock deformation, the extending device is subjected to relative displacement along with the rod body and thus adapts to surrounding rock deformation is achieved.

Description

technical field [0001] The invention relates to the protection facility technology of civil engineering, in particular to an anchor rod which can adapt to the deformation of surrounding rock, and can be applied to support projects such as tunnels and side 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 burie...

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 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

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