Antenna Foundation Construction
Antenna Foundation Construction #8
The antenna foundation work is almost completed. The rest is scheduled to be slightly reworked by the end of November.
We took a commemorative photo with the contractors Co. TAKEHANA-GUMI and NANSHIN Electric Industry Co.. We thank you for the solid construction despite the strict requirements.
(Expansion of antenna basic room)
(Antenna foundation panoramic view: 32m in diameter)
Antenna Foundation Construction #7
The finished inspection of the antenna foundation was completed on November 1st. The interior of the power building is still under construction.
The photo below shows the completed inspection of the antenna foundation (on November 1).
The distance from the antenna foundation room to the rail anchor bolt installed near a radius of 16m is being measured by transit. Since it takes time to measure all 900 pieces one by one, we will check the data measured in advance and confirm it by unannounced inspection. Both passed.
Place a corner reflector (laser reflector) on the rail anchor bolt and measure accurately.
Exterior of the power building
Antenna Foundation Construction #6
The skeleton work for the antenna foundation was completed on October 12. Currently, the finishing work of the antenna equipment room is underway. Interior work is still underway for the electric power building.
Antenna basic panoramic view (on October 6.)
The distance from the antenna foundation room to the rail anchor bolt installed near a radius of 16m is being measured by transit. Since it takes time to measure all 900 pieces one by one, we will check the data measured in advance and confirm it by unannounced inspection. Both passed.
Antenna base chamber and Az rotating structure anchor frame set (on September 25)
FEP pipe laying between antenna foundation and power building (on September 29)
Status of construction site on October 10.
Antenna Foundation Construction #5
Of the antenna foundations, the master collimator foundation and rail foundation were completed on September 14, and the backfilling of the surplus soil was started. In addition, construction of the foundation room has begun.
Antenna basic panoramic view
Antenna rail anchor frame installation status (In the assembly and construction of the anchor frame, Corona Giken made a lot of effort to keep the error within a few millimeters.)
Construction status of the electric power building
Status of construction site on September 11
Antenna Foundation Construction #4
The anchor frame for the master collimator foundation, the anchor frame set for the antenna rail, and the concrete placement were completed on August 9.
Laying work of 150mmφ FEP pipe
Master collimator anchor bolt position measurement
Overall view of the antenna rail foundation
Status of construction site on August 9
Antenna Foundation Construction #3
Pile driving was completed on July 13, and the foundation work was started.
The photo below shows the root cutting of the master collimator foundation at the heart of the antenna.
The photo below shows the pile cueing of the antenna rail foundation.
Status of construction site on July 3
Antenna Foundation Construction #2
On June 7, 21 out of 24 piles were completed. The photo below shows the status of pile driving work. A total of 24 piles with a diameter of 1.8 m will be driven into the bedrock.
Center the stakeout area (Centering)
Excavate with casing
Remove waste soil in the casing and Continue it until you reach the bedrock
Insert a rebar cage into the excavated hole
Placing concrete
Status of construction site on June 6
Antenna Foundation Construction #1
Preparatory work for antenna foundation work started on April 28.
The photo below shows the situation on May 8.
Status of construction site on May 9
Confirmation of antenna center position
Prior to the start of the antenna foundation work, a survey was conducted to drop the antenna foundation center specified in the design drawing into the construction site, and the center position was determined and confirmed on April 21.
The center position of the antenna was confirmed by using both the surveying method using two reference points on the Tateshina skyline and the GPS surveying method.
The photo below shows the survey situation. As a result, the foundation center could be set with an error of several mm with respect to the drawing position.
