Control method for increasing air pressure intensity in pile sleeve of sand pile through extrusion

The invention provides a control method for increasing the air pressure intensity in a pile sleeve of a sand pile through extrusion. The method comprises the following contents that an air pressure intensity sensor arranged in the pile sleeve is connected with an electric control system, a pneumatic pressurizing valve and a pneumatic pressure reducing valve are also connected with the electric control system, the inside and outside pressure balance principle of the pile sleeve is used, and the air pressure intensity target value in the pile sleeve is calculated through the position of the bottom of the pile sleeve relative to a water layer and a mud layer and the length of a sand post in the pile sleeve; the electric control system determines the opening and the closing of the pneumatic pressurizing valve and the pneumatic pressure reducing valve according to the deviation between the measuring value of the air pressure intensity sensor and the air intensity target value in the pipe sleeve, so that the measuring value of the pressure intensity sensor always maintains the air pressure intensity target value in the pile sleeve. The control method has the advantages that the opening and the closing of the pneumatic pressuring value and the pneumatic pressure reducing valve are controlled through the electric control system, the automation degree is high, the construction precision is high, a great amount of manual operation control is avoided, and the labor resources are saved.