Arrow anchor rod of multi-section clamping grouting anchoring and using method thereof

Abstract

The invention relates to the field of slope reinforcement and surrounding rock support control of underground engineering, disclosing an arrow anchor rod of multi-section clamping grouting anchoring,which comprises a sleeve (5), a grouting rod body device and a sealing device, wherein the grouting rod body device is arranged in the sleeve (5); the grouting rod body device comprises a grouting rodbody (7) and a plurality of groups of anchor heads (6); each group of anchor heads (6) forms a clamping anchoring structure and are connected to the outer wall of the grouting rod body (7) in hinge mode; the sleeve (5) is provided with a slotted hole (5002) which is in one-to-one correspondence with the anchor head (6) and suitable for the anchor head (6) to pass; the anchor head (6) is guided into the rock mass along the slotted hole (5002) by the external force of propelling grouting rod body device; a sealing structure is formed between the sleeve (5) and the grouting rod body device by utilizing a sealing device and is fixed on the rock wall (9). By adopting the technical innovation of the arrow anchor rod of multi-section clamping grouting anchoring, continuous high-resistance and high-strength working resistance can be provided timely and efficiently, so that the long-term stability of the engineering geotechnical mass maintenance under the environment of high stress or strong power disturbance can be truly achieved.

Description

technical field [0001] The invention relates to the fields of side slope reinforcement and surrounding rock support control in underground engineering, in particular to a multi-section clamping grouting anchoring arrow bolt. Background technique [0002] At present, in the process of urban rail transit construction, excavation of mountain or hydropower tunnels, deep resource mining, and even major slope treatment projects, unfavorable rock and soil layers with complex occurrence conditions are often encountered, with well-developed joints, strong structural composites, and structural stresses. The level is high, and the anchoring quality of traditional bolts will be severely tested when the mine construction method is used for maintenance and control. If it is subjected to strong dynamic disturbances such as blasting excavation, mining disturbances, and seismic waves in the later stage, it is difficult to control the overall anchoring system at this time. Failure due to poor...

AI Technical Summary

Problems solved by technology

However, for the common round steel bonded solid anchor rod widely used at present, it is divided into end anchorage or full-length anchorage, as a main supporting structure, but its anchoring agent is cement mortar and resin coil, and the anchorage in the hole wall The fullness is difficult to control, and the anchoring effect is also difficult to guarantee. In the reinforcement of rock and soil in complex environments, the rod body is often cut or pulled out to form a cavity in the surrounding rock and fail.

As a hollow grouting bolt suitable for unfavorable rock and soil layers, although the gap between the rod body and the hole wall is filled with grouting, and a protective anchoring layer with a uniform thickness is achieved, the cross-sectional size weakens its tensile strength. Solid anchor high resistance breaking pullout force

[0004] Furthermore, in order to enhance the comprehensive performance of traditional bolts and improve the stability of rock and soil under complex geological conditions, in the past inventions and technologies, most of the designed bolt support devices have optimized structures at the ends to enhance the anchoring force, or The anchoring strength of the designed segmental anchoring device is often insufficient, and its stability needs to be verified on site. Therefore, it has a single function or limited adaptability conditions, and it is difficult to adapt to geotechnical engineering with high ground stress or strong disturbance and strict deformation control.

For example, the patent CN104929670B discloses a wing-type anchor rod, in which an expandable clamping wing is provided on the anchoring section for anchoring at the end. The anchoring force of this anchor rod is mainly provided by the end wing device. The ability to resist bending moments is limited, and it is difficult to withstand complex geological environments

Patent CN107939427A discloses an energy-absorbing-seismic bolt that can greatly absorb the deformation energy of the surrounding rock and quickly yield pressure at the same time. It has many advantages such as high strength, stable support, elastic reset, and high damping. The rod body reduces the overall shear force, and it is easy to cause uneven deformation of the surrounding rock mass and be sheared and failed

Patent CN104832201B discloses an expandable anchor rod. The invention mainly expands the lower end of the anchor sleeve through the anchor rod head to clamp it in the slope. Its principle is similar to the mechanical working principle of the expansion screw, but the anchor rod at the expanded end The sleeve is only clamped to the surface of the hole wall, and the whole is not grouted and solidified. At the free end, there is no tray member similar to the traditional anchor rod that strengthens the supporting plate force at the end, so the overall anchoring force cannot be guaranteed, and the free end Easy to cause nut slippage failure

Patent application CN107620603A discloses a new type of grouting anchor rod with a steel sleeve rod. The hollow threaded steel anchor rod is modified by adding a steel sleeve rod, and the steel rod is stretched out and supported by the rock mass Direct contact, and increase the overall tensile and shear capacity of the grouting material and the anchor rod by means of grouting. The structural defect of this invention is that the steel rod is stretched out and the hole rock wall is in contact with the hole rock wall to enhance the anchoring force. However, when the steel rod encounters a strong dynamic disturbance The connecting rod is susceptible to sliding deformation due to the influence of deviatoric stress. In addition, the effective support point will be lost after the hole wall is cracked and reamed, which will lead to the failure of the anchor point

The patent application CN108457684A discloses an extendable anchor rod. The main consideration is that the extension device and the rod body will be displaced relative to each other to adapt to the large deformation of the surrounding rock. However, the rod body structure built into the surrounding rock has no advantage over the traditional anchor rod. At the same time, the setting of the extension device and the exposed end of the surrounding rock affect the net section size of the roadway to a certain extent.

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