Settlement driving control structure and method for forced-settlement rectification

Abstract

A settlement driving control structure for forced-settlement rectification and a settlement driving control method for forced-settlement rectification are provided. The settlement driving control structure includes: a vertical hole is formed in a raft of a building, a lower end of an anchor bolt is anchored at the bottom of the vertical hole and the other end of the anchor bolt extends out of the vertical hole to be connected to a tensioning device, two grouting pipes are configured for grouting to form an anchorage body, and two waterstop rubber rings are spaced apart on a position of the anchor bolt above the anchorage body. For a building with a great load on the upper part, a building foundation and a deep stable stratum are connected as a whole by stress application through the device.

What is claimed is: 
     
         1 . A settlement driving control structure for forced-settlement rectification, comprising:
 a vertical hole formed in a raft of a building and extending vertically into a soil layer of a building foundation;   an anchor bolt having a lower end anchored at a bottom of the vertical hole and an other end extending out of the vertical hole to be connected to a tensioning device;   two grouting pipes extending along the anchor bolt and configured for grouting to form an anchorage body at the bottom of the vertical hole; and   two waterstop rubber rings spaced apart on a position of the anchor bolt above the anchorage body, wherein micro-expansive early-strength concrete is filled above the anchorage body to reinforce the vertical hole to form a mini pile.   
     
     
         2 . The settlement driving control structure for forced-settlement rectification according to  claim 1 , wherein one of the waterstop rubber rings is arranged in a middle of the raft, and an other one of the waterstop rubber rings is arranged at a lower edge of the raft. 
     
     
         3 . The settlement driving control structure for forced-settlement rectification according to  claim 1 , wherein a positioning frame arranged between the raft and the anchorage body is threadedly assembled to the anchor bolt, and an outer periphery of the positioning frame is supported on an inner wall of the vertical hole. 
     
     
         4 . The settlement driving control structure for forced-settlement rectification according to  claim 1 , wherein a length of the anchorage body is greater than five times a spacing between an upper edge of the anchorage body and an upper edge of the vertical hole, and the spacing between the upper edge of the anchorage body and the upper edge of the vertical hole is greater than a thickness of the raft of the building and is greater than 1 meter. 
     
     
         5 . The settlement driving control structure for forced-settlement rectification according to  claim 1 , wherein the tensioning device comprises a first lock nut, a first bearing plate, a jack, a second bearing plate, a first locking auxiliary sleeve, a third bearing plate, a stress gauge, and a fourth bearing plate that are mounted to the anchor bolt from top to bottom sequentially, and the third bearing plate abuts against an opening of the vertical hole;
 the anchor bolt is provided with a second lock nut that is arranged inside the first locking auxiliary sleeve correspondingly and abuts against the second bearing plate, and the first locking auxiliary sleeve is provided with a hand hole corresponding to the second lock nut.   
     
     
         6 . The settlement driving control structure for forced-settlement rectification according to  claim 5 , wherein the grouting pipes are cut off below a level of the waterstop rubber rings upon a completion of grouting. 
     
     
         7 . A settlement driving control method for forced-settlement rectification, comprising steps of
 step S 1 : forming a vertical hole in a raft of a building;   step S 2 : mounting a positioning frame, two grouting pipes and waterstop rubber rings to an anchor bolt, and settling the anchor bolt to a bottom of the vertical hole;   step S 3 : injecting cement slurry to the bottom of the vertical hole through the grouting pipes to form an anchorage after the cement slurry solidifies;   step S 4 : cutting off the grouting pipes, assembling a tensioning device at an upper end of the anchor bolt, tensioning the anchor bolt by the tensioning device, and carrying out construction of soil-excavation forced-settlement at a soil layer during a tensioning process until an inclination of the building is reverted; and   step S 5 : removing the tensioning device, cutting off the anchor bolt, and injecting micro-expansive early-strength concrete into the vertical hole to reinforce the soil layer below the building.   
     
     
         8 . The settlement driving control method for forced-settlement rectification according to  claim 7 , wherein the two grouting pipes are configured for grouting successively to complete injection of the cement slurry, an injection pressure of the cement slurry for first grouting is 0.5 to 0.8 Mpa, and an injection pressure of the cement slurry for later grouting is greater than or equal to 1.5 Mpa. 
     
     
         9 . The settlement driving control method for forced-settlement rectification according to  claim 7 , wherein in the step S 4 , tensioning the anchor bolt comprises:
 locking a first lock nut and driving a jack for jacking; and   retracting the jack after locking a second lock nut, locking the first lock nut again, and carrying out the construction of soil-excavation forced-settlement upon alternative locking with the first lock nut and the second lock nut until a reading of a stress gauge reaches a preset parameter.   
     
     
         10 . The settlement driving control method for forced-settlement rectification according to  claim 9 , wherein when a parameter of the stress gauge reaches 50% of a design value during the construction of soil-excavation forced-settlement, the alternative locking with the first lock nut and the second lock nut is repeated until an inclination of the building is reverted.