Self-propelled hollow slip casting anchor rod with stress-measuring function and operating method

Abstract

The invention relates to the technical field of tunnel and underground construction anchoring equipment, in particular to a self-propelled hollow slip casting anchor rod with a stress-measuring function and an operating method. The self-propelled hollow slip casting anchor rod with the stress-measuring function includes a rod body with a hollow structure, a self-propelled drill is connected at thefront end of the rod body, and the back end of the rod body is provided with a slip casting opening which communicates with an inner cavity of the rod body; and the rod body is further provided witha stress-measuring device and an anchoring structure which is close to the self-propelled drill. According to the self-propelled hollow slip casting anchor rod with the stress-measuring function, thestress-measuring device is arranged to combine the processes of drilling, anchoring and slip casting into the same construction process, and the anchoring can be achieved in short time; and stress conditions of all sections of the anchoring rod in the supporting process can be monitored, so that the supporting mechanism of action and the stress conditions of the anchoring rod under the various kinds of surrounding rock conditions can be known, and critical evidences and references are supplied to the research of design parameters for the anchoring rod, improvement of the construction techniqueand the surrounding rock failure mechanism.

Description

technical field [0001] The invention relates to the technical field of anchoring equipment for tunnels and underground engineering, in particular to a self-advancing hollow grouting anchor rod with a force-measuring function and a use method thereof. Background technique [0002] As a safe and efficient main support method for tunnel engineering, bolt support has been widely promoted and applied in tunnel engineering and coal mine roadway support in my country. Bolt support is to anchor one end of the bolt in the surrounding rock body, and apply an axial pre-tightening force to the bolt outside the rock mass, and restrict the deformation, delamination and fragmentation of the surrounding rock by setting the attached components on the bolt Misaligned with slip. [0003] When using conventional technology for bolt support, it is required that the surrounding rock has good structural integrity, and it is possible to drill holes for bolt installation, and after the drilling is ...

AI Technical Summary

Problems solved by technology

There are various deficiencies in the application of several existing anchors: such as full-length bonded anchors (ordinary cement mortar anchors, early-strength cement mortar anchors, resin roll anchors, cement powder roll anchors), Drilling, anchoring and grouting cannot be completed continuously in one construction; the strength of the existing bolts is low, and in high ground stress tunnels and underground projects, the bolts will be broken quickly as the deformation of the surrounding rock increases; The existing metal anchors are inconvenient to process, and the cost of using metal anchors is relatively high. The threaded steel resin anchors and a small amount of glass fiber reinforced plastic resin anchors mainly used in the market are not strong and easy to break, and they are too fast after installation. It takes a period of time to obtain a certain amount of solid force; in the case of hard rock, joints and cracks in rock formations that are open and mixed with mud or groundwater is developed, the commonly used bolts cannot quickly form initial support, making it impossible to control the deformation of the surrounding rock at the initial stage of anchorage. The rod can obtain higher anchoring strength, and at the same time, it can quickly obtain higher strength at the initial stage of anchoring. Anchoring agent is added during anchoring, but the anchoring agent cannot immediately form a higher anchoring strength, and the anchoring agent will worsen the working environment.

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