Patent AU-2021105983-A4 (AU)
Title: A Construction Method for Reinforced-hoop Gravel Piles by Means of Immersed Tubes for Strengthening Soft Foundations
Inventor: CAO XIULING
IPC: E02D3/08
Filed: 2021-08-19
Granted: 2021-10-28
Abstract: ADstracy 
The present invention discloses a construction method for reinforced-hoop gravel piles by 
means of immersed tubes for strengthening soft foundations. Specifically, implement 
construction on the ground surface of foundation to form pile holes firstly, then, install several 
grouting pipes in the pile holes, wherein, these grouting pipes shall be distributed in 
circumferential direction and uniformly, and shall be installed 0.2-0.3m above the ground level, 
and thus, the grouting can be completed easily. Then, fill in gravel at the entrance located on the 
top of each pile pipe, followed by putting in the completed geogrid tube from the top of each pile 
hole, and then fill gravel into the openings of the geogrid tubes, and thus the reinforced-hoop 
gravel piles can be obtained. After 3-5 days since the formation of these gravel piles, utilize a 
high-pressure grouting pump to inject cement slurry through the retained grouting pipes to fill 
the pores existed in the gravel piles, and thus, the semi-rigid grouting gravel piles can be formed.  
The structure of the pile pipe adopted by the gravel pile of the present invention is simple, and 
the construction method is rapid and simple, which would not cause deformation or collapse of 
wall of hole, and can guarantee the construction quality effectively.
drawings o 1escripions 
SiC01 Build a onstuction pl-atom ofrvel pile, then,i ma the construction platkom of 
gavel pile to the bundati, and:se t up gavel stage bin, a vitating impactor and a 
vibrating immersd tube gavel pile drive on the construction platim ofgravel pile.  
S100 Implement construction on the pound susfice Oftundation to m pile holes frstly.  
theninstl:seveal outing pips in the pile holes, when, these outing pips shall be 
distributed incircuxherential direction and unibaly. and shall be installed slightly above 
theground level, and thus. the gouting can be completed easily.  
S1003. Install the pile pip on the vibiating immersed tube gavel pile driver. then, vibrate 
the ised tube at the designatedtcction ofthe bundation, and stop the vibration aiter 
reaching the designated elevation; ae i tht fill in gavel at the entrance lccated on the top 
ofthe pile pip, then, continue torleish gavel while drawing the pipe with vibration, 
meanwhile, control the amount ofgavel. and thus, it can guarantee that the distance e tween 
the top suftceofvel and the top ofthe pile holeiswithin 3-5 
SlO4 Put in the completed geoprid tube rom the top ofech pile hole, then ill avel into 
the opening ofthe geopid tube and thus the reinbrced-hcop gavel pile can be obtained.  
Whesein, the amount ofgravel fied in shall be sufficient to guarantee that the top elevation 
ofthe reinorced-hcep gavel pile can reach the designated elevatioiL 
S1005. A~er 3-5 days since the creation ofthe grave pileutilize a high-presuregru ting 
pump to inject cement slurry through the retained pouting pipe to 11 the pres existed in th 
gavel pile, and thus, the se-ri-gid pouting gavel pile - be fose 
Figure 1 
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