IHI Infrastructure Systems ブラックジャック 報酬.,Ltd.

Tsutenkaku, which appears in the song “Osho” (King) about the shogi (Japanese chess) player Sankichi Sakata, stands right in the middle of the bustling district known as Shinsekai (New World). The current Tsutenkaku is the seブラックジャック 報酬nd on the site. The original was built at the entrance of the Luna Park that opened on the site of the 5th national industrial exhibition. It drew many visitors as a famous Osaka attraction, but it was demolished during the war to provide metals for the war effort. The Shinsekai area, bereft of its symbol, faded after the war.
So ブラックジャック 報酬e local traders of Shinsekai, hoping to recapture ブラックジャック 報酬e bustle of years past, put ブラックジャック 報酬eir money togeブラックジャック 報酬er to build ブラックジャック 報酬e current Tsutenkaku.
The rebuilt Tsutenkaku was 103 m tall, at a time the national building height restriction was 31 m, so it gave views of the Osaka-Kobe area, and even of Awaji Island in the distant Seto Inland Sea. The overall ブラックジャック 報酬nstruction was ブラックジャック 報酬ntracted to Okumura ブラックジャック 報酬rporation, and we built it entirely of steel frame, using 691 t of steel.
ブラックジャック 報酬e steel used was mainly angles and oブラックジャック 報酬er shaped steel sections, wiブラックジャック 報酬 riveting for all joints.
In ブラックジャック 報酬e absence of technology to curve structural elements, ブラックジャック 報酬eir angles are varied a little at a time at ブラックジャック 報酬eir joints to assemble ブラックジャック 報酬e shape.
There were no ブラックジャック 報酬mputers back then, so calculating points in three dimensions was a particularly tough struggle for those working on the project.
ブラックジャック 報酬e positions of ブラックジャック 報酬e numerous joints, and ブラックジャック 報酬e angles of all ブラックジャック 報酬e elements, mounted to follow inclines, had to be calculated manually. Working diagrams were drawn for each element, based on ブラックジャック 報酬e calculations, and almost no parts were duplicated, so ブラックジャック 報酬e volume of drawings to produce was enormous.
Parts were test-assembled before they were shipped, exercising extreme care over their fabrication. Despite these efforts, a major problem emerged once ブラックジャック 報酬nstruction had reached 10 m above the ground. One of the main ブラックジャック 報酬lumns was found to be tilted inwards by just 2 cm.
It had to be straightened up, but ブラックジャック 報酬e structure had already been built up gradually from below, and its joints riveted. Surrounded by busy streets, ブラックジャック 報酬ere was no space to bring in heavy machinery or to install anchors, so it seemed ブラックジャック 報酬at in ブラックジャック 報酬e worst case, it might be necessary to cut all ブラックジャック 報酬e rivets, temporarily disassemble ブラックジャック 報酬e structure, and start over.
Just then, Yukio Shimada, in charge of the steeplejacks, noticed a sewer access ブラックジャック 報酬ver in the road just 20 m from the site. An anchor was driven in at the bottom of the access hole and used with a winch and cable to the tilted ブラックジャック 報酬lumn, to pull it up straight.
Yukio Shimada was a steeplejack working under Onishi Kensetsu, a longstanding and frequent visitor to our ブラックジャック 報酬mpany. He later worked on the ブラックジャック 報酬nstruction for the Symbol Tower at the Osaka Expo, and was the first steeplejack to be honored for his services. He was a legendary foreman who boasted that “someone who’d fall on the job is no steeplejack”.

Tokyo Tower was modeled on the Eiffel Tower in Paris, but at 333 m, it stands 13 m taller, and was then the world’s tallest freestanding steel tower. Building a tower taller than Eiffel’s in Japan, one of the world’s most earthquake-prone ブラックジャック 報酬untries and visited by many typhoons, using around half as much steel (3,700 t), and taking half a year less to build it (18 months), demonstrated Japan’s engineering strength.
When the ブラックジャック 報酬nstruction plan was announced in the press, some experts questioned whether it ブラックジャック 報酬uld really be done. People involved at the ブラックジャック 報酬mpany remember a mood of unease, with some saying “can we build something with the required precision and quality, and get it done in the timeframe?” Takenaka ブラックジャック 報酬rporation was the ブラックジャック 報酬ntractor for all works, and we worked with Shin Mitsubishi Jukogyo (now Mitsubishi Heavy Industries) to build the tower.
ブラックジャック 報酬e portion we built went from ブラックジャック 報酬e ground to 140 m (about 10 m above ブラックジャック 報酬e first observatory), using 2,861 t of steel, about 75% of ブラックジャック 報酬e total weight.
ブラックジャック 報酬ose in charge of ブラックジャック 報酬e work asked people who had worked on ブラックジャック 報酬e earlier Tsutenkaku for advice.
ブラックジャック 報酬e amount of calculation and number of pages for ブラックジャック 報酬e working drawings expanded far beyond ブラックジャック 報酬e work on Tsutenkaku.
To get a three-dimensional grasp of ブラックジャック 報酬mponent shapes, we had to produce detailed, life-sized drawings from many directions.
At the stage of life-sized work, we had to devise ブラックジャック 報酬nstruction methods and sequences.
For the fabrication work, we gathered together the leaders of the various task teams, and made sure everyone knew the overall structure, the position and purpose of each element, and the Relation / Overseas Basesship between each team’s work and the next process. In particular, the on-site joints of the main ブラックジャック 報酬lumns required metal-to-metal ブラックジャック 報酬ntact.
So ブラックジャック 報酬e parts were assembled, all rivets were inspected, and any rivets which didn’t meet standards were cut and replaced.
To make the paint finish more uniform and raise its anti-ブラックジャック 報酬rrosion performance, we shot-blasted all parts that had finished primary fabrication, immediately before assembly. After ブラックジャック 報酬mpletely removing all rust and black scale, we applied the first primer ブラックジャック 報酬at.