2016-09-30 07:09:12
http://wpb.shueisha.co.jp/2016/09/13/71934/
One after another, a mistake is also detected in structure calculation in a dangerous... Toyosu new market in seismic intensity a little less than 6!
[September 13, 2016]
The Toyosu new market where postponement of opening was decided
Koike Yuriko Governor of Tokyo has decided open postponement in the Toyosu new market scheduled for November 7. An investigation of an earth and ground water pollution and a close inspection of big and full total operating expenses are the postponed reason, but several problems are surfaced in the structure of the building this time.
Toyosu is a landfill originally and foundation is weak. zei of the structure which will be a basis in a building there (It leaks.), when piling up, may not a collapse by a big earthquake also be saved? Such hypothesis, and, when a structure statement of the Toyosu new market will be probed, various moot points have been seen.
The 4th floor where the one is 6 blocks of Toyosu new market (marine relationship wholesale place ridge). The thickness of "suppression concrete" used for floor part in a related monohan emporium and disposal of goods space is light extremely.
Something I rise from the top of concrete on a floor and strike it to protect a prevention water layer, and to make suppression concrete. Though there is about 10 cm of that from thickness 15cm at other floors, there is only only 1 cm of these 2 point. What is a too thin reason? When I ask Miyako, such response has returned.
"The related monohan store is also no problem in the floor strength by this thickness. At least 10 cm of indication which should be here was received for protection of a prevention water layer and it was checked because of on the other hand, using water at disposal of goods space. Then 15cm showed that built one isn't appropriated for a structure statement at a site." (the person in charge of central wholesale market new market Motor Service Department)
The structure statement was wrong. As soon as the contents are made a check by a structure statement on at the urban development bureau which has jurisdiction, and complete, when a correction report is done, I say present and Building Standards Law at a capital.
The same person in charge in a capital says "Maybe the person in charge of a company who undertakes a design overlooked." about a reason of an omission, but when just replacing a number, this isn't the fact that I finish. The one which calculates the number which becomes the basis to do the design which made have earthquake resistance with structure calculation. If that's wrong, earthquake resistance is because itself is shaken from the root.
When suppression concrete of thickness 15cm was increased, struck and done in disposal of goods space on the 4th floor, the weight of the 1300t will be added by simple calculation. In other words, only that's the reason by which the upper part in a building was in the heavy state, but is it that there are no problems with earthquake resistance? Mr. Takashi Moriyama of a construction economist who saw enormous material about a design in Toyosu market points out so.
"Now that the suppression concrete which isn't on a structure statement is constructed, there is a fear that earthquake performance in a building is in the state which doesn't satisfy the standard. When an earthquake occurs, it's said that damage becomes big only that."
Such problem is surfacing one after another in Toyosu market now. --as which specialists of construction have seen the prediction to which they say surprisingly, that even "seismic intensity a little less than 6" is dangerous by a condition of a plan of the current state when a problem is heard conversantly.
The "weekly playboy" selling it pursues more problems of aseismic design in Toyosu market by 39 and 40 combined numbers. I'm inspecting conversantly including the part built already, so could you also read there by all means?
(Coverage, a sentence and photography/Kirishima shun)
■ "Weekly playboy" 39 and 40 combined numbers "There are also no horseflies in seismic intensity a little less than 6 in Toyosu new market!?".
2016-09-30 07:09:12
http://wpb.shueisha.co.jp/2016/09/13/71934/
震度６弱でも危ない…豊洲新市場の構造計算に続々、ミスが発覚！
[2016年09月13日]
開場の延期が決まった豊洲新市場
小池百合子都知事が、１１月７日に予定されていた豊洲新市場の開場の延期を決めた。土壌・地下水汚染の調査や大きく膨らんだ総事業費の精査などが延期の理由だが、今度は建屋の構造にいくつかの問題点が浮かび上がっている。
豊洲はもともと埋め立て地で地盤が弱い。そこに建物の基本となる構造の脆（もろ）さが重なれば、大地震による倒壊も免れないのではないか？ そんな仮説をもとに豊洲新市場の構造計算書を精査してみると、様々な疑問点が見えてきた。
そのひとつが豊洲新市場６街区（水産仲卸売場棟）の４階。関連物販店舗と荷捌きスペースの床部分に使われている「押さえコンクリート」の厚さが極端に薄いのだ。
押さえコンクリートとは、防水層を保護するために床のコンクリートの上から増し打ちするもの。それが他のフロアでは厚さ１５ｃｍから１０ｃｍほどあるのに、この２ヵ所だけ１ｃｍしかない。薄すぎる理由はなんなのか？ 都に尋ねるとこんな答えが返ってきた。
「関連物販店舗はこの厚さでも床強度に問題ありません。一方、荷捌きスペースでは水を使うことから、防水層の保護のために少なくても１０ｃｍはあるはずだとの指摘を受けて確認しました。すると現場では１５ｃｍで施工したものが構造計算書に計上されていないことがわかりました」（中央卸売市場・新市場整備部の担当者）
構造計算書が間違っていたのだ。都では現在、建築基準法を所管する都市整備局で構造計算書のチェックを受けていて、内容が整い次第、修正報告をするという。
記載漏れの理由について、都の同じ担当者は「設計を請け負う会社の担当者が見落としたのではないか」と言うが、これは単に数字を入れ替えれば済む話ではない。構造計算とは、耐震性を持たせた設計をするための基礎となる数字を算出するもの。それが間違っていたら、耐震性そのものが根底から揺らぐからだ。
４階の荷捌きスペースに厚さ１５ｃｍの押さえコンクリートを増し打ちしたとすると、単純計算で１３００ｔの重さが加わることになる。つまり、それだけ建物の上部が重い状態になったわけだが、耐震性に問題はないのだろうか？ 豊洲市場の設計に関する膨大な資料を見た建築エコノミストの森山高至氏はこう指摘する。
「構造計算書にない押さえコンクリートが敷設されている以上、建物の耐震性能が基準を満たさない状態になっている恐れがあります。地震が起きればそれだけダメージが大きくなるということです」
今、豊洲市場にはこうした問題が次々と浮上している。建築の専門家たちに問題点を詳しく聞いたところ、現状の計画のままでは、なんと「震度６弱」でも危ないという予測が見えてきた――。
発売中の『週刊プレイボーイ』３９・４０合併号では、さらに豊洲市場の耐震設計の問題を追求。すでに建てられてしまった部分も含め、詳しく検証しているので、是非そちらもお読みいただきたい。
（取材・文・撮影／桐島 瞬）
■『週刊プレイボーイ』３９・４０合併号「豊洲新市場は震度６弱でもアブない！？」より
