JP2961152B2 - Shield excavation method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavation method, and more particularly to a method of excavating while measuring azimuth in a horizontal direction using a gyro compass while performing azimuth control.

"Conventional technology and problems that the invention does not solve"
A digging method is adopted in which the azimuth (direction) of the shield machine is measured by a gyro compass at any time during excavation and the azimuth of the shield machine is corrected and controlled while grasping a deviation value from the direction of the excavation route.

However, since the gyro compass has its own inherent deflection, the accuracy of the azimuth measurement is poor, and the directional control must be performed repeatedly during excavation (see the curve of the gyro compass value in FIG. 1 and the excavation). The direction is corrected at the position where the base line of the route crosses the base line).

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides a method of measuring the orientation of a shield machine at required intervals measured a plurality of times by a gyro compass during excavation movement in a Scherrer cycle (85 minutes). It proposes a digging method in which the value of the angle is converted to a moving average, and a horizontal moment is given by jacking in the direction of eliminating the difference between this moving average and the direction of the digging route of the shield machine by jacking. is there.

"Action" In order to use the moving average value in the statistical Scherrer cycle as the data for azimuth correction control, a large number of measurement values of the gyro compass and the inherent vibration are averaged to obtain a highly accurate value, The shield machine can be excavated in an appropriate direction, and the number of times of the direction correction control (the direction is corrected at the position where the moving average curve crosses the base line of the direction of the excavation route in FIG. 2) is reduced. Time loss of excavation and horizontal meandering of the machine can be reduced.

[Embodiment] The present invention will be described below with reference to an embodiment shown in the drawings. During the excavation movement of the shield machine, the azimuth angle of the shield machine is shortened for a short time, for example, 20 seconds by a gyro compass every statistical Scherer cycle (85 minutes) Measure many times at intervals and enter into the computer.

Then, the calculation processing by the computer is performed, and a moving average value is obtained from a large number of measured values in each Scherrer cycle, and the shielding machine is moved in a direction to eliminate the difference between the moving average value 85 minutes before the present time and the direction of the shield machine excavation line. On the other hand, a jack is operated to give a horizontal moment, and the digging is performed while correcting the direction (correcting the direction at the position where the curve of the moving average value and the baseline of the direction of the digging route line intersect in FIG. 2).

[Effects of the Invention] As described above, according to the present invention, the moving average value in the Scherrer cycle is employed as the data for the azimuth correction control, so that the measured values of the gyro compass many times and the inherent shake are averaged, and the accuracy is improved. , The shield machine can be dug in an appropriate direction, and the number of direction correction controls can be reduced to reduce the time loss of the excavation and the horizontal meandering of the machine.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a measured value of a gyrocompass in a Scherrer cycle, FIG. 2 is a diagram showing a value of a gyrocompass obtained by performing a moving average process on the values of FIG. 1, and FIG. 3 is a diagram of FIG. FIG. 3 is a diagram obtained by combining FIG. 2 with FIG.

Claims (1)

(57) [Claims] An azimuth value of a shield machine measured a plurality of times at required intervals by a gyro compass during a digging movement at a Scherrer cycle (85 minutes) is converted into a moving average value, and this moving average value and the digging of the shield machine are performed. A shield excavation method characterized by excavating by giving a horizontal moment by jack operation in a direction to eliminate a difference from a direction of a route.