Title:
METHOD AND DEVICE FOR CONSTRUCTING IMPROVED GROUND
Document Type and Number:
Japanese Patent JP2968407
Kind Code:
B2
Abstract:
PURPOSE: To accurately control and grasp the dimension of an improved ground constructed by using an improved foundation constructing method including injecting and agitating a sedimenting coagulant in sludge after drilling, separating water and mud by means of agitation, and measuring the drilled cavity using ultrasonic waves.
CONSTITUTION: As a stiffener injection rod 11 is rotated and high pressure water is injected from a high pressure water injection nozzle 14, a device advances into the ground to drill a cavity in the ground. Next, a sedimenting coagulant is injected from a sedimenting coagulant nozzle 15 into turbid sludge generated by drilling and is agitated and the turbid sludge is separated into water and mud by the action of the sedimenting coagulant. Cavity measurement using ultrasonic waves, which is possible immediately when the water and mud are separated to some degree and the water becomes clear, is carried out using an ultrasonic wave sensor 16. When the cavity is found to be less than a predetermined dimension from the measurements, drilling is continued, whereas when the cavity is found to have reached the predetermined dimension a high pressure stiffener is injected from a stiffener injection nozzle 13 to replace the sludge in the cavity.
Inventors:
NAKANISHI WATARU
Application Number:
JP35406292A
Publication Date:
October 25, 1999
Filing Date:
December 15, 1992
Export Citation:
Assignee:
ENU AI TEI KK
International Classes:
E02D3/12; E02D27/26; G01B17/00; G01B17/06; (IPC1-7): E02D3/12
Domestic Patent References:
| JP59106624A | ||||
| JP61137914A | ||||
| JP62146906U |
Attorney, Agent or Firm:
Takashiro Kojima