Centre grouted poured post-grouting pile construction methods, and grouter and grout injector used thereby

The invention discloses a centre grouted post-grouting pile construction methods, and a grouter and a grout injector used thereby, and solve the problems of incorrect insertion position of a grouting pipe, easy deformation of the grouting pipe, low construction efficiency, high construction cost, small bearing force, poor efficiency of reinforcing loose soil at the bottom of a bore and the like in a bore bottom and bore side post-grouting construction method. The method I and the method IV comprise steps of downwards lowering the grout injector through a core tube of a drilling tool and then injecting concrete into the bore through the core tube of the drilling tool; the method II comprises steps of downwards lowering the grout injector through a steel tube and then injecting concrete into the bore through the steel tube; the method III comprises a step of downwards lowering the body of a grout injecting tube through a convoying device of the grout injecting tube; a broken stone feeding guide plate of the grouter and a concrete conveying pipe are communicated with a feed tube of the grout injecting tube respectively; a compression ring and a concrete baffling steel ring are fixedly arranged on the outer wall of the pore bottom grout injecting tube of the grout injector adopted by the method I and the method II; and a convoying device body is sleeved on the grout injector body adopted by the method III. The centre grouted post-grouting pile construction methods, the grouter and the grout injector are applied in the technical field of concrete grouted pipe construction.