Device and method for grouting and reinforcing secondary casing pipe of coal seam floor

Abstract

The invention discloses a device and a method for grouting and reinforcing a secondary casing pipe for a coal seam floor. The device comprises a flange pipe connected with a gate valve and a grouting flange pipe, wherein the flange pipe connected with the gate valve is arranged at the upper part of the grouting flange pipe; the flange pipe connected with the gate valve comprises a flange plate, a hard pipe with threads fixedly connected to the upper end of the flange plate and a casing pipe with threads fixedly connected to the lower end of the flange plate; the grouting flange pipe comprises a flange plate, a casing pipe with threads fixedly connected to the lower end of the flange plate and a grouting hose connection pipe fixedly connected to one side of the casing pipe with threads; the flange plate of the flange pipe connected with the gate valve and the flange plate of the grouting flange pipe are connected with each other through bolts; the hard pipe with threads at the upper end of the flange pipe connected with the gate valve is connected to a choke plug gate valve. The method is characterized by grouting and reinforcing the secondary casing pipe by using the device; the device and the method can be used for effectively reinforcing a gap between an outer casing pipe layer and an inner casing pipe layer; the problems that grout and water are leaked when the grout is injected into the drilled surface and the casing pipe is released in the later period can be solved; the device is convenient to demount after being used and can be repeatedly used.

Description

technical field [0001] The invention relates to a coal seam floor grouting reinforcement device and method, in particular to a coal seam floor grouting reinforcement secondary casing device and method. Background technique [0002] Coal is an important basic energy source in China. my country's coal resources are very rich and its uses are very extensive, which is of great significance to the development of my country's national economy. The dominance of coal in primary energy production and consumption has not been shaken. In terms of coal consumption, coal consumption in the power, steel, building materials and chemical industries accounts for more than 80% of coal consumption. [0003] With the continuous extension of coal mining depth and the continuous expansion of mining area, the ground stress increases, geological anomalies also gradually increase, water pressure gradually increases, hydrogeological conditions become more and more complex, and the threat of water in...

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Problems solved by technology

[0005] The invention overcomes the problems in the prior art that the gap between the outer casing and the inner casing is not easy to reinforce when the secondary casing is drilled and grouted, resulting in grout leakage and water leakage during the drilling ground grouting and loosening of the casing in the later stage. A device and method for strengthening the secondary casing by grouting the coal seam floor with simple structure and convenient use are provided

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