Title:
INSTALLATION AND SINKING METHOD FOR UNDERWATER STRUCTURE AND ITS EQUIPMENT
Document Type and Number:
Japanese Patent JP3358077
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To achieve safe installation work by making ship maneuvering and positioning easier by measuring the underwater position of an underwater structure suspended from a construction craft with its position and height measured by GPS satellite from a relative relation between the construction craft and an existing underwater point and by determining the deviation between the measured position and design position.
SOLUTION: By using GPS type ship position measuring equipment 13, the position of a ship 1 is measured and its corrective calculations are made for azimuth, pitch and roll data of gyrocompass 17, and it is guided to the target installation position while measuring the azimuth and position of a ship 1. After positioning the ship 1, a caisson is sunk, an ultrasonic type underwater position measuring equipment 14 is operated after sinking of the levee crown under sea surface, the distance from an echo sounder receiver on the ship 1 to the sunken caisson 2 and to the echo sounder transmitter installed on an existing caisson 15 is measured, then three-dimensional coordinates of the echo sounder transmitter are calculated, and the absolute position of the caisson 2 and the relative position to the existing caisson 15 are measured and they are guided to the sunk position while controlling the deviation of normal line and mesh intervals. Thus, ship maneuvering and positioning are made easier, and safe installation can be made possible while accurately knowing interval to the existing caisson 15.
Inventors:
Masanori Tajima
Noriaki Moriya
Miyazaki Tadashi
Noriaki Moriya
Miyazaki Tadashi
Application Number:
JP11747097A
Publication Date:
December 16, 2002
Filing Date:
April 22, 1997
Export Citation:
Assignee:
Goyo Construction Co., Ltd.
International Classes:
E02D23/02; E02D29/09; (IPC1-7): E02D29/09; E02D23/02
Domestic Patent References:
| JP8319622A | ||||
| JP4331395A | ||||
| JP835836A | ||||
| JP8285589A | ||||
| JP7110380A | ||||
| JP7270519A | ||||
| JP9165732A | ||||
| JP10115522A | ||||
| JP1060904A | ||||
| JP10123247A |
Attorney, Agent or Firm:
Seiichi Sawaki (1 outside)