We installed Y_plus pylon and measure Y_minus pylon position roughly.
I will report detail one tomorrow morning.
Installation of the Y+ Pylon
move and installY+ Pylon
To transport the pylon to the Y+ side, it was moved through the area beneath the arm. A waterproof sheet had been laid at the installation location. Therefore, the sheet was cut approximately 1 cm outside the perimeter of the pylon base, and the section beneath the pylon was removed before installation.
Rust-like material was observed on the tapped holes in the floor. This material was not removed before installation.
The pylon was installed while being suspended using a chain block and slings. No shims were placed beneath the pylon. After the pylon was secured with bolts, no rocking was observed; however, gaps remained between parts of the pylon base and the floor. The tightening torque of the bolts was not controlled.
Measurement of the Pylon Height
The height of the pylon was measured using a laser level. The reference datum was the centerline of the left and right BS OUT ports, as surveyed on March 15, 2017.
A scale was placed vertically on top of the pylon, and the position at which the laser line crossed the scale was recorded. Measurements were taken at four locations, as shown in the figure.
(①, ②, ③, ④) = (133.5, 133.5, 133.5, 133.5) mm
According to the drawing, the design value should be 125 mm. However, since the height of the TM center is currently unknown, these measurements should be regarded as reference values only.
