Secondary support grouting anchor rod with self-adaptive function

Abstract

The invention discloses a self-adaptive secondary support grouting anchor rod, and relates to the technical field of support equipment. The technical problem that secondary grouting reinforced supporting is carried out by automatically adapting to mine pressure change is solved. The self-adaptive secondary support grouting anchor rod comprises a grouting mechanism, an anchoring mechanism, a monitoring mechanism and a positioning mechanism, wherein the grouting mechanism comprises a grouting box, a grouting motor, a one-way valve, a grouting stopping plug and a grouting hole. The grouting box is internally provided with a lead screw structure and a push plate, and the one-way valve is arranged at an outlet of the grouting box. The grouting hole is formed in the front section of a rod body,and the grouting stopping plug is arranged at the rear end of the rod body. The anchoring mechanism comprises an inner nut, a pad plate, an outer nut and the rod body. The monitoring mechanism includes a pressure sensor and a threshold starting switch, and the pressure sensor is arranged between the pad plate and a drilling hole. The positioning mechanism includes a sliding positioning device, andthe sliding positioning device is provided with a ball. The self-adaptive secondary support grouting anchor rod has the advantages that by using the anchor rod for supporting, the anchor rod can be fixed in the middle axis position of the drilling hole, automatic grouting can be achieved according to the change of the mine pressure, the construction is convenient, and the degree of automation ishigh.

Description

technical field [0001] The invention relates to the technical field of bolt support equipment, in particular to a bolt capable of secondary support and grouting with an adaptive function. Background technique [0002] With the rapid development of my country's economic construction, the demand for energy development, transportation and other infrastructure construction continues to increase. Tunnels and underground chambers are the main structural forms of highways, railway tunnels and mining projects. The safety, quality, schedule and economic benefits of the project have a decisive impact. The traditional surrounding rock reinforcement methods for tunnels and underground caverns in my country include bolt reinforcement, grouting reinforcement, anchor cable reinforcement, anchor net support, etc., but all of them have certain disadvantages. The length of the bolt is an important factor restricting the anchor bolt to strengthen the coal pillar; the grouting support improves ...

AI Technical Summary

Problems solved by technology

[0003] The deficiencies existing in the support of hollow bolts at home and abroad mainly include: (1) When using anchoring agent to anchor the bolt, because the anchoring agent still has fluidity in the initial stage, it is easy to cause the anchor to sink due to gravity and other factors. It cannot be centered and anchored, and the thickness of the mortar protection layer cannot meet the requirements of the specification

(2) Since it takes a certain amount of time for the anchoring agent to form strength, for weak and broken rock formations, the bolt cannot immediately work together with the anchoring agent to form the initial anchoring force, and cannot prevent the deformation of the rock mass and strengthen the support immediately.

(3) The non-grouting section of the hollow bolt near the end of the rock body is a dead spot for anti-corrosion of the bolt body, which cannot guarantee the stable and effective work of the bolt body in the later stage

(4) After the anchoring agent is crushed by the anchor rod, it is difficult to fully stir and compact it, and it cannot be fully bonded with the surrounding rock mass, which affects the effective anchoring length of the anchoring agent section in the mid-term

(5) The contact surface between the backing plate at the outer end of the hollow anchor rod and the wall is too direct, which is not conducive to the uniform force of the backing plate and the wall and the buffering of rock vibration.

(6) The grout stopper cannot guarantee good airtightness during grouting of anchor bolts, and it will leak air or even mortar, which cannot guarantee the effect of full grouting

(7) The existing bolts are used for one-time anchoring, and cannot be re-reinforced according to changes in roadway surrounding rock or mine pressure, and cannot further reduce the possibility of mine disasters

[0004] Based on the above existing defects affecting hollow bolt support, as well as Chinese patent applications CN201610152410, CN201711322431, and CN201810076569, it is found that the existing grouting bolts are all grouted in the previous stage to increase the stability of the surrounding rock, and do not have real-time monitoring and according to The set stress-strain threshold automatically has the self-adaptive ability of secondary grouting to strengthen the surrounding rock, so the present invention further improves the existing bolt support equipment

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