T-shaped reamed pile, composite foundation, and construction method for composite foundation

Abstract

Provided are a T-shaped reamed pile, a composite foundation, and a construction method for the composite foundation, relating to the technical field of civil engineering. The composite foundation is composed of a T-shaped reamed pile, soil between piles, and a cushion layer. The T-shaped reamed pile is composed of a core pile, a reamed body surrounding the outside of the core pile. A depth of the core pile is not lower than that of the reamed body, the reamed body includes an upper reamed body, and a lower reamed body, and a diameter of the upper reamed body is larger than that of the lower reamed body. The core pile is a precast pile, the reamed body is a cast-in-place reamed body, and the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer.

What is claimed is: 
     
         1 . A T-shaped reamed pile, wherein the T-shaped reamed pile is composed of a core pile, and a reamed body surrounding the outside of the core pile; a depth of the core pile is not lower than that of the reamed body, and the reamed body comprises an upper reamed body, and a lower reamed body; and a diameter of the upper reamed body is larger than that of the lower reamed body. 
     
     
         2 . The T-shaped reamed pile according to  claim 1 , wherein the core pile is a precast pile, and the reamed body is a cast-in-place reamed body. 
     
     
         3 . The T-shaped reamed pile according to  claim 1 , wherein the diameter of the upper reamed body is 1.5-2.5 times an outer diameter of the core pile, and a length of the upper reamed body is 5-10 times the outer diameter of the core pile. 
     
     
         4 . The T-shaped reamed pile according to  claim 1 , wherein the length of the upper reamed body is not less than 2 m. 
     
     
         5 . The T-shaped reamed pile according to  claim 1 , wherein a material of the reamed body is selected from fine aggregate concrete, a cement-soil mixture, or a cement-bentonite slurry; and the core pile is selected from a prestressed concrete thin-walled pipe pile, a prestressed concrete square pile, a hollow square pile, or a prestressed concrete variable diameter pipe pile. 
     
     
         6 . A composite foundation, wherein the composite foundation is composed of a T-shaped reamed pile, soil between piles, and a cushion layer; and the T-shaped reamed pile is the T-shaped reamed pile according to  claim 1 . 
     
     
         7 . The composite foundation according to  claim 6 , wherein the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer, and the cushion layer has a thickness of 300-500 mm. 
     
     
         8 . The composite foundation according to  claim 7 , wherein the cushion layer is a reinforced cement-soil cushion layer, a reinforced material of the cushion layer is a double-layer steel plate mesh structure, and a thickness of a protective layer is not less than 80 mm. 
     
     
         9 . A construction method for the composite foundation according to  claim 6 , comprising the following steps:
 Step one, drawing out soil at a pile location by a drill bit with an aperture opening function and a long spiral drill pipe to form a hole, thus forming a T-shaped pile hole;   Step two, pouring a material of a reamed body into the T-shaped pile hole;   Step three, after the pouring of the material of the reamed body is completed, driving a core pile to a designed depth of the T-shaped pile hole; and   Step four, after the curing of the material of the reamed body is completed, constructing a cushion layer, wherein the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer.   
     
     
         10 . The construction method for the composite foundation according to  claim 9 , wherein when the cushion layer is a reinforced cement-soil cushion layer, the cement soil is constructed by a compaction method, and a compressive strength is not less than 3 MPa. 
     
     
         11 . The T-shaped reamed pile according to  claim 3 , wherein the length of the upper reamed body is not less than 2 m. 
     
     
         12 . The T-shaped reamed pile according to  claim 2 , wherein a material of the reamed body is selected from fine aggregate concrete, a cement-soil mixture, or a cement-bentonite slurry; and the core pile is selected from a prestressed concrete thin-walled pipe pile, a prestressed concrete square pile, a hollow square pile, or a prestressed concrete variable diameter pipe pile. 
     
     
         13 . The T-shaped reamed pile according to  claim 3 , wherein a material of the reamed body is selected from fine aggregate concrete, a cement-soil mixture, or a cement-bentonite slurry; and the core pile is selected from a prestressed concrete thin-walled pipe pile, a prestressed concrete square pile, a hollow square pile, or a prestressed concrete variable diameter pipe pile. 
     
     
         14 . The composite foundation according to  claim 6 , wherein the core pile is a precast pile, and the reamed body is a cast-in-place reamed body. 
     
     
         15 . The composite foundation according to  claim 6 , wherein the diameter of the upper reamed body is 1.5-2.5 times an outer diameter of the core pile, and a length of the upper reamed body is 5-10 times the outer diameter of the core pile. 
     
     
         16 . The composite foundation according to  claim 6 , wherein the length of the upper reamed body is not less than 2 m. 
     
     
         17 . The composite foundation according to  claim 6 , wherein a material of the reamed body is selected from fine aggregate concrete, a cement-soil mixture, or a cement-bentonite slurry; and the core pile is selected from a prestressed concrete thin-walled pipe pile, a prestressed concrete square pile, a hollow square pile, or a prestressed concrete variable diameter pipe pile. 
     
     
         18 . The composite foundation according to  claim 14 , wherein the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer, and the cushion layer has a thickness of 300-500 mm. 
     
     
         19 . The construction method for the composite foundation according to  claim 9 , wherein the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer, and the cushion layer has a thickness of 300-500 mm. 
     
     
         20 . The construction method for the composite foundation according to  claim 19 , wherein the cushion layer is a reinforced cement-soil cushion layer, a reinforced material of the cushion layer is a double-layer steel plate mesh structure, and a thickness of a protective layer is not less than 80 mm.