Device and method used for reinforcing by combining vacuum preloading and circular electro-osmosis

The invention relates to a device and method used for reinforcing by combining vacuum preloading and circular electro-osmosis. The device comprises two outer tubes, an inner tube and an electrode bar are inserted in each outer tube, the two electrode bars are connected with the positive pole and the negative pole of a power supply, the two inner tube are connected with a jet pump, the surfaces of the two inner tubes are each wrapped by a reverse osmosis membrane, the two outer tubes are inserted into soft soil, and top openings of the two outer tubes are located above the soft soil. The method includes the following steps that firstly, holes are drilled in the soft soil; secondly, the outer tubes are fixed; thirdly, the electrode bars are powered on; fourthly, water is sucked; fifthly, the poles of the power supply are exchanged; sixthly, the jet pump is stopped and the power supply is switched off; seventhly, concrete is injected. The reverse osmosis membranes effectively prevent positive and negative ions in the soil from entering the inner tubes, and loss of the positive and negative ions in the soil is prevented; the positive and negative poles, connected with the electrode bars, of the power supply are exchanged, so that the moving directions of the positive and negative ions in the soil are changed, and the soil is reinforced again in the movement process of the positive and negative ions.