Concrete inside interface processing structure and method for secant pile construction

A processing method of concrete inside interface in secant pile construction, comprising:

• step 1:
• cleaning up a sprayed surface;
• removing a loose part of a soil body at an interface between enclosure piles according to an excavation sequence of a foundation pit, after excavating each layer of soil between formed plain concrete piles;
• step 2:
• drilling holes with a vertical spacing on each formed plain concrete pile along an axis direction of each formed plain concrete pile;
• welding a ribbed steel bar and a Y-shaped connecting piece together and anchoring the ribbed steel bar and the Y-shaped connecting piece on the formed plain concrete piles by a bar glue;
• step 3:
• preparing a steel mesh sheet;
• step 4:
• installing the steel mesh sheet;
• wherein the sprayed surface is ensured flat before hanging the steel mesh sheet, and steel mesh sheet nodes on both sides of the steel mesh sheet are hanged to two hooks of the Y-shaped connecting piece to make a connection of the steel mesh sheet and the Y-shaped connecting piece firm;
• step 5:
• driving a U-shaped connecting, piece into the sprayed surface after the U-shaped connecting piece is connected with middle nodes of the steel mesh sheet to firmly fix the steel mesh sheet to the soil body between the formed plain concrete piles;
• step 6:
• spraying concrete;
• wherein spraying operation is carried out in sections. zones and layers from top, to bottom in sequence;
• step 7:
• repeating steps 2 to 6;
• wherein double layers of steel mesh sheet are used between the formed plain concrete piles, the concrete is sprayed in layers, and a concrete layer is finally formed;
• step 8:
• constructing a reinforced concrete pile;
• leveling a site and setting out lines for positioning;
• constructing a concrete guide wall on a top of the reinforced concrete pile;
• positioning a drilling machine after a strength of the concrete guide wall meets a requirement;
• removing soil to form a pile hole and placing a steel reinforcement cage into the pile hole;
• grouting concrete by grouting pipe, and pulling out the grouting pipe to complete a construction of the pile hole;
• step 9:
• constructing of rotary jet grouting piles;
• adding four rotary jet grouting piles with same diameter as the reinforced concrete pile on both sides of the reinforced concrete pile;
• wherein the rotary jet grouting piles interlock with the reinforced concrete pile and are tangent to the formed plain concrete pile and the secant concrete pile;
• leveling the site and setting out lines for positioning;
• drilling a rotary jet grouting pile hole. and then inserting a grouting pipe to spray concrete grout after a drill is positioned.