Drainage anti-slide pipe pile suitable for open channel project of expansive soil in cold and arid regions and construction method thereof

Abstract

A drainage anti-slide pipe pile suitable for an open channel project of expansive soil in cold and arid regions and a construction method thereof are provided. The pipe pile includes a pile body, wherein the pile body is provided with a dewatering section and an embedded section arranged up and down, a wall of the dewatering section of the pile body is provided with a plurality of drainage channels for consolidation drainage; and the embedded section of the pile body is embedded in a solid rock stratum to provide an anti-slide effect. The drainage anti-slide pipe pile is more targeted at the expansive soil channel project in cold and arid regions, which can effectively control seepage water level behind a channel slope in an operational period, quickly reduces lagging dewatering level behind the slope in the initial stage of a shutdown period, and improves the stability of the entire slope.

What is claimed is: 
     
         1 . A drainage anti-slide pipe pile suitable for an open channel project of expansive soil in cold and arid regions, comprising a pile body, wherein the pile body is provided with a dewatering section and an embedded section arranged up and down, a wall of the dewatering section of the pile body is provided with a plurality of drainage channels for consolidation drainage; and the embedded section of the pile body is embedded in a solid rock stratum to provide an anti-slide effect. 
     
     
         2 . The drainage anti-slide pipe pile according to  claim 1 , wherein a pile cover is arranged on a side of the dewatering section of the pile body far away from the embedded section to prevent soil particles from entering an interior of the drainage anti-slide pipe pile. 
     
     
         3 . The drainage anti-slide pipe pile according to  claim 2 , wherein the dewatering section, the embedded section, and the pile cover of the pile body are all cast with steel slag concrete. 
     
     
         4 . The drainage anti-slide pipe pile according to  claim 1 , wherein a geomembrane is attached to an inner wall of the pile body. 
     
     
         5 . The drainage anti-slide pipe pile according to  claim 1 , wherein a water pumping channel is arranged at an end of the dewatering section of the pile body adjacent to the embedded section. 
     
     
         6 . The drainage anti-slide pipe pile according to  claim 1 , wherein a ratio of a total area of the plurality of drainage channels to a side area of the pile body is less than 0.03; the plurality of drainage channels are arranged along a long direction of the pile body at a spacing of 0.5 m; and a diameter of each of the plurality of drainage channels is 1/10 of an outer diameter of the pile body. 
     
     
         7 . The drainage anti-slide pipe pile according to  claim 1 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         8 . The drainage anti-slide pipe pile according to  claim 7 , wherein a plurality of water level sensors are arranged from top to bottom on an inner side wall of the dewatering section of the pile body, the plurality of water level sensors are electrically connected to a water level controller, and the water level controller is electrically connected to the water pump. 
     
     
         9 . A construction method of the drainage anti-slide pipe pile according to  claim 1  in a middle of a channel slope, comprising the following steps:
 S 110 : performing on-site surveying and mapping, and determining a piling location and a length of the drainage anti-slide pipe pile according to on-site water level and channel slope data during an operational period; 
 S 120 : according to the piling location, drilling a hole by rotary drilling, the hole extending to a water pumping pipe of a box culvert structure at a bottom of the channel slope, then hoisting the drainage anti-slide pipe pile to a drilling position, slowly piling, lowering the embedded section and the dewatering section of the pile body in sections, hoisting the embedded section of the pile body to align with a construction hole, checking a verticality of the pile body during a piling process, controlling a vertical deviation to be less than or equal to 0.5% when a first section of the pile body and the embedded section are inserted into ground, starting to press the drainage anti-slide pipe pile after requirements are met, stopping pile delivering when the embedded section is lowered to 1000 mm above a soil body, and completing laying of a geomembrane on an inner wall of the drainage anti-slide pipe pile in advance before sinking the drainage anti-slide pipe pile; 
 S 130 : hoisting the dewatering section of the pile body to the piling location, welding the dewatering section and the embedded section into an integral structure after checking the verticality of the pile body, checking a verticality of a welded integral pile body, and completing a pile delivering process; and 
 S 140 : after the pile delivering process is completed, connecting a pre-buried drainage pipe with a hole of the dewatering section, pouring steel slag concrete into the drainage anti-slide pipe pile, and mounting a pile cover made of the steel slag concrete after a pouring and a curing are completed. 
 
     
     
         10 . A construction method of the drainage anti-slide pipe pile according to  claim 1  at a top of a channel slope, comprising the following steps:
 S 210 : performing on-site surveying and mapping, and determining a piling location and a length of the drainage anti-slide pipe pile according to on-site water level and channel slope data during an operational period; 
 S 220 : arranging a water level sensor on an inner wall of the dewatering section of the pile body in advance before pile delivering, and connecting an end of the water level sensor with a water level controller; 
 S 230 : according to the piling location, drilling a hole by rotary drilling, the hole extending to a water pumping pipe of a box culvert structure at a bottom of the channel slope, then hoisting the drainage anti-slide pipe pile to a drilling position, slowly piling, lowering the embedded section and the dewatering section of the pile body in sections, hoisting the embedded section of the pile body to align with a construction hole, checking a verticality of the pile body during a piling process, controlling a vertical deviation to be less than or equal to 0.5% when a first section of the pile body and the embedded section are inserted into ground, starting to press the drainage anti-slide pipe pile after requirements are met, stopping pile delivering when the embedded section is lowered to 1000 mm above a soil body; 
 S 240 : hoisting the dewatering section of the pile body to the piling location, welding the dewatering section and the embedded section into an integral structure after checking the verticality of the pile body, checking a verticality of a welded integral pile body, and completing a pile delivering process; and 
 S 250 : after the pile delivering process is completed, connecting a pre-buried drainage pipe with a hole of the dewatering section, pouring steel slag concrete into the drainage anti-slide pipe pile, and mounting a pile cover made of the steel slag concrete after a pouring and a curing are completed. 
 
     
     
         11 . The drainage anti-slide pipe pile according to  claim 2 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         12 . The drainage anti-slide pipe pile according to  claim 3 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         13 . The drainage anti-slide pipe pile according to  claim 4 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         14 . The drainage anti-slide pipe pile according to  claim 5 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         15 . The drainage anti-slide pipe pile according to  claim 6 , wherein when arranged at a top of a channel slope, the drainage anti-slide pipe pile further comprises an automatic water pumping and drainage device, the automatic water pumping and drainage device comprises a water pumping and drainage pipe positioned in the pile body, a first end of the water pumping and drainage pipe extends to the embedded section, and a second end of the water pumping and drainage pipe extends to an outer side of the pile body and is connected to a water pump. 
     
     
         16 . The construction method according to  claim 9 , wherein in the drainage anti-slide pipe pile, the pile cover is arranged on a side of the dewatering section of the pile body far away from the embedded section to prevent soil particles from entering an interior of the drainage anti-slide pipe pile. 
     
     
         17 . The construction method according to  claim 16 , wherein in the drainage anti-slide pipe pile, the dewatering section, the embedded section, and the pile cover of the pile body are all cast with the steel slag concrete. 
     
     
         18 . The construction method according to  claim 9 , wherein in the drainage anti-slide pipe pile, the geomembrane is attached to an inner wall of the pile body. 
     
     
         19 . The construction method according to  claim 9 , wherein in the drainage anti-slide pipe pile, a water pumping channel is arranged at an end of the dewatering section of the pile body adjacent to the embedded section. 
     
     
         20 . The construction method according to  claim 9 , wherein in the drainage anti-slide pipe pile, a ratio of a total area of the plurality of drainage channels to a side area of the pile body is less than 0.03; the plurality of drainage channels are arranged along a long direction of the pile body at a spacing of 0.5 m; and a diameter of the drainage channel is 1/10 of an outer diameter of the pile body.