Construction operations: (1) building or to remove loose concrete base section, remove the old concrete surface concrete surface layer to expose new ballast water to rinse the surface after use interface treatment agent roughed or brushing AJ302 agent and then poured concrete . Before the construction of water will need to be further pouring wet concrete surface, grout mixing water use tap water without grease and other chemicals, to be consistent with "concrete mixing water standards" artificial stirring, for a total of 12 to 13% water, to join 2/3 of mixing water 2min, followed by the remaining water is added to the homogeneous mixture, stirring every grout ensure use it up within 40min. (Mixing location near grout should place) grout with mobility 260 ~ 290mm completely overcome the narrow portion of the site filling adverse conditions, the construction by gravity or a little chopped stream can flow into the desire of filling all voids, and compaction grouting material itself, can guarantee filling parts of compactness. (2) generate action after grouting material and water volume expansion, expansion coefficient greater than 0.02%, after hardening grout can get full filling effect. (3) Filling 1d compressive strength greater than 22MPa, 3d up to 45MPa, help speed up the progress of the project. (4) The bond strength grouting material with smooth steel is greater than or equal to 6MPa, and twisted steel bond strength is greater than or equal to 10MPa, cohesive force to fully meet the requirements to ensure that the grouting material and reinforced in the building has sufficient adhesion, achieve the purpose of integration. (5) grout should be finished immediately stamped within 30min wet straw bags or rockwool, should be kept moist, and should ensure adequate curing time.