Grouting consolidation method for full casing borehole guide prefabricated pile and prefabricated pile therefor

Abstract

A grouting consolidation method for a full casing borehole guide prefabricated pile, comprising the following steps: S1, driving a drilling rig carrying a casing (1) to perform borehole construction, the borehole construction being performed to a preset hole depth to form a borehole (2); S2. the casing (1) being housed in the borehole (2); S3. implanting a prefabricated pile (4) into the borehole (2) so that the prefabricated pile (4) reaches a hole bottom of the borehole (2); S4. injecting a slurry (3) into the borehole (2); S5. pulling out the casing (1) so that the prefabricated pile (4) and an inner cavity of the borehole (2) are fixed and cemented into an integrated structure. Also provided is a prefabricated pile, comprising a pile body and a grouting channel (5) provided on the pile body, wherein a liquid inlet end (11) of the grouting channel (5) extends out from an upper end surface of the pile body and a liquid outlet end (12) of the grouting channel (5) extends out from a lower end surface of the pile body and/or a side surface of the pile body.

1 . A method for grouting and consolidating a full casing borehole guide prefabricated pile, wherein,
 the method is used for foundation construction of water projects and comprises the following steps:   S1. driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth to form a borehole;   S2. housing the casing in the borehole;   S3. implanting a prefabricated pile into the borehole so that the prefabricated pile reaches a hole bottom of the borehole;   S4. injecting a slurry into the borehole;   S5. pulling out the casing so that the prefabricated pile and an inner cavity of the borehole are fixed and cemented into an integrated structure.   
     
     
         2 . The method according to  claim 1 , wherein,
 the implanting a prefabricated pile into the borehole so that the prefabricated pile reaches a hole bottom of the borehole in step S3 comprises the following steps:   pre-injecting a slurry into the borehole;   before solidification of the slurry, the prefabricated pile is implanted into the borehole to reach the hole bottom of the bore.   
     
     
         3 . The method according to  claim 1 , wherein,
 the prefabricated pile is prefabricated with a grouting channel for injecting the slurry into the borehole,   the pulling out the casing in step S5 comprises continuously grouting into the borehole through the grouting channel on the prefabricated pile during the process of pulling out the casing, and/or   the injecting the slurry into the borehole in step S4 comprises grouting into the borehole through the grouting channel on the prefabricated pile before pulling out the casing.   
     
     
         4 . The method according to  claim 3 , wherein,
 the grouting channel comprises a first grouting channel on a bottom surface of the prefabricated pile;   the pulling out the casing in step S5 comprises continuously grouting into the borehole through the first grouting channel during the process of pulling out the casing, and/or   the injecting the slurry into the borehole in step S4 comprises grouting into the borehole through the first grouting channel before pulling out the casing.   
     
     
         5 . The method according to  claim 3 , wherein,
 the grouting channel comprises a second grouting channel located at a side of the prefabricated pile for grouting between the prefabricated pile and the bore hole; and   the method further comprises a step S6, grouting between the prefabricated pile and the bore hole through the second grouting channel.   
     
     
         6 . The method according to  claim 1 , wherein,
 during the foundation construction of water projects with a water area having a base rock layer at a bottom thereof,
 the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises the following steps: 
 sinking the casing to the base rock layer; 
 sinking a drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and 
 drilling the base rock layer to form a base rock borehole in the base rock layer; and 
   the removing the drilling bit of the drilling rig from the base rock borehole, and housing the casing in the base rock borehole in step S2 comprises,
 removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and 
 the borehole comprises the base rock borehole. 
   
     
     
         7 . The method according to  claim 1 , wherein
 during the foundation construction of water projects with a water area having a bottom comprising a loose layer and a base rock layer sequentially from up to down,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises:
 sinking the casing to the loose layer, and the drilling rig drilling the loose layer to drive the casing through the loose layer to form a loose layer borehole; 
 removing mud and sand from the casing; 
 sinking the drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and drilling the base rock layer to form a base rock borehole in the base rock layer; 
   the removing the drilling bit of the drilling rig from the borehole, and housing the casing in the borehole in step S2 comprises,
 removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and 
 the borehole comprises the loose layer borehole and the base rock borehole. 
   
     
     
         8 . The method according to  claim 1 , wherein,
 during the foundation construction of water projects with a water area having a loose layer at a bottom thereof,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises:
 sinking the casing to the loose layer, and the drilling rig drilling the loose layer to form a loose layer borehole to bring the casing into the loose layer; 
 removing mud and sand from the casing. 
   
     
     
         9 . The method according to  claim 6 , wherein
 an upper end of the prefabricated pile is located above a water surface of the water area, or   an upper end of the prefabricated pile is located below a water surface of the water area.   
     
     
         10 . The method according to  claim 1 , wherein
 the slurry comprises cement slurry and/or mortar and/or chemical slurry.   
     
     
         11 . A prefabricated pile, comprising
 a pile body, and   a grouting channel, arranged on the pile body, wherein a liquid inlet end of the grouting channel extends out of an upper end surface of the pile body, and a liquid outlet end of the grouting channel extends out of a lower end surface of the pile body and/or a side surface of the pile body.   
     
     
         12 . The prefabricated pile according to  claim 11 , wherein,
 the pile body is a reinforced concrete prefabricated pile, and the grouting channel is a grouting pipe prefabricated on a steel cage of the pile body.   
     
     
         13 . The method according to  claim 4 , wherein,
 the grouting channel comprises a second grouting channel located at a side of the prefabricated pile for grouting between the prefabricated pile and the bore hole; and   the method further comprises a step S6, grouting between the prefabricated pile and the bore hole through the second grouting channel.   
     
     
         14 . The method according to  claim 2 , wherein,
 during the foundation construction of water projects with a water area having a base rock layer at a bottom thereof,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises the following steps:   sinking the casing to the base rock layer;   sinking a drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and   drilling the base rock layer to form a base rock borehole in the base rock layer; and   the removing the drilling bit of the drilling rig from the base rock borehole, and housing the casing in the base rock borehole in step S2 comprises,   removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and   the borehole comprises the base rock borehole.   
     
     
         15 . The method according to  claim 3 , wherein,
 during the foundation construction of water projects with a water area having a base rock layer at a bottom thereof,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises the following steps:   sinking the casing to the base rock layer;   sinking a drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and   drilling the base rock layer to form a base rock borehole in the base rock layer; and   the removing the drilling bit of the drilling rig from the base rock borehole, and housing the casing in the base rock borehole in step S2 comprises,   removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and   the borehole comprises the base rock borehole.   
     
     
         16 . The method according to  claim 4 , wherein,
 during the foundation construction of water projects with a water area having a base rock layer at a bottom thereof,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises the following steps:   sinking the casing to the base rock layer;   sinking a drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and   drilling the base rock layer to form a base rock borehole in the base rock layer; and   the removing the drilling bit of the drilling rig from the base rock borehole, and housing the casing in the base rock borehole in step S2 comprises,   removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and   the borehole comprises the base rock borehole.   
     
     
         17 . The method according to  claim 5 , wherein,
 during the foundation construction of water projects with a water area having a base rock layer at a bottom thereof,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises the following steps:   sinking the casing to the base rock layer;   sinking a drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and   drilling the base rock layer to form a base rock borehole in the base rock layer; and   the removing the drilling bit of the drilling rig from the base rock borehole, and housing the casing in the base rock borehole in step S2 comprises,   removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and   the borehole comprises the base rock borehole.   
     
     
         18 . The method according to  claim 2 , wherein
 during the foundation construction of water projects with a water area having a bottom comprising a loose layer and a base rock layer sequentially from up to down,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises:
 sinking the casing to the loose layer, and the drilling rig drilling the loose layer to drive the casing through the loose layer to form a loose layer borehole; 
 removing mud and sand from the casing; 
 sinking the drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and drilling the base rock layer to form a base rock borehole in the base rock layer; 
   the removing the drilling bit of the drilling rig from the borehole, and housing the casing in the borehole in step S2 comprises,
 removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and 
 the borehole comprises the loose layer borehole and the base rock borehole. 
   
     
     
         19 . The method according to  claim 3 , wherein
 during the foundation construction of water projects with a water area having a bottom comprising a loose layer and a base rock layer sequentially from up to down,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises:
 sinking the casing to the loose layer, and the drilling rig drilling the loose layer to drive the casing through the loose layer to form a loose layer borehole; 
 removing mud and sand from the casing; 
 sinking the drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and drilling the base rock layer to form a base rock borehole in the base rock layer; 
   the removing the drilling bit of the drilling rig from the borehole, and housing the casing in the borehole in step S2 comprises,
 removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and 
 the borehole comprises the loose layer borehole and the base rock borehole. 
   
     
     
         20 . The method according to  claim 4 , wherein
 during the foundation construction of water projects with a water area having a bottom comprising a loose layer and a base rock layer sequentially from up to down,   the driving a drilling rig carrying a casing to perform borehole construction to a preset hole depth in step S1 comprises:
 sinking the casing to the loose layer, and the drilling rig drilling the loose layer to drive the casing through the loose layer to form a loose layer borehole; 
 removing mud and sand from the casing; 
 sinking the drilling bit of the drilling rig to the base rock layer through the inner cavity of the casing, and drilling the base rock layer to form a base rock borehole in the base rock layer; 
   the removing the drilling bit of the drilling rig from the borehole, and housing the casing in the borehole in step S2 comprises,
 removing the drilling bit of the drilling rig from the base rock borehole and the casing sequentially, and a lower end of the casing entering an opening edge of the inner cavity of the base rock borehole; and 
   
       the borehole comprises the loose layer borehole and the base rock borehole.