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Old October 28th, 2008, 03:15 PM   #121
japanese001
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大橋シールドマシンが貫通 - 首都高速道路「大橋ジャンクション」報道公開

首都高速道路は23日、東京都目黒区に建設中の「大橋ジャンクション」の地下ルートを掘り進んできた「大橋シールドマシン」を報道公開した。今回は、同マシンが国道246号と環状6号(山手通り)の地下を、片道約430m掘り進んだところで折り返し、再び出発点に戻ってきた時点での公開となる。この到達で、中央環状新宿線(熊野町ジャンクション~大橋ジャンクション間、11km)のシールド掘削はほぼ終了ということになる。
大橋ジャンクションは、国道246号上を通過する高速3号渋谷線と、中央環状新宿線(2009年完成予定)と中央環状品川線(2013年完成予定)を接続するループ状のジャンクションで、高架を走る渋谷線と地下を通り抜ける中央環状線を結ぶための大規模な工事が現在も進められている。敷地面積は国立競技場のグラウンドと同程度。地上ループ部分は4層構造、地下連絡部分は上下線が縦に並ぶ「上下併設」構造になっていて、ループ中央部分は換気所などが設けられる。
大橋シールドマシンには世界初の試みがある。上下に並べられたトンネルをつくるにあたり、上段部分のトンネルを2006年夏から掘り始めた同マシンは、折り返し地点となる大橋ジャンクション地下部分でUターンし、下段まで高さを落として再び下段部分を掘削していくというジャッキダウン・Uターン方式を採用。この世界初となるUターンで、大幅なコスト削減につなげている。
今回の報道公開では、大橋ジャンクション地下から、すでに地下トンネルとして整備された3号方面連絡路(上段)を約430m歩き、大橋シールドマシンの出発点である「松見坂立杭」(山手通り)内の地下を見学した。中央環状新宿線方面連絡路となる下段には、任務をほぼ終えた大橋シールドマシンが顔を出し、両方向の道路が縦に並ぶ状態を確認できた。
ループ部分の屋上も見学。屋上部分は緑化され一般の入場が可能な公園として整備される。また、同ジャンクションに隣接するかたちで、地上27階建てと41階建ての再開発ビルが2棟建設される。屋上の公園とこの再開発ビルは連絡歩道橋で結ばれる予定だ。
中央環状新宿線の大橋ジャンクション~西新宿ジャンクション間が開通すると、3号渋谷線の東名高速道方面と、放射状に延びる中央道、東北道、常磐道、京葉道とが、中央環状線で結ばれ、都心を経由せずに連絡できるようになる。同区間は2009年度の開通を目指し、現在急ピッチで工事が進められている。

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Old October 28th, 2008, 04:32 PM   #122
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Two TBM tubes one above another and above all street with viaduct? Masterwork!
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Old October 29th, 2008, 06:59 AM   #123
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Ohashi JC
they say 50% of expressways traffic jam is solved by this



































http://radiate.jp/archives/2006/08/10164126.php
http://radiate.jp/archives/2007/12/15123333.php

Last edited by castermaild55; October 29th, 2008 at 08:01 AM.
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Old October 29th, 2008, 07:12 AM   #124
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OMG!! those videos are just impressive....
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Old October 29th, 2008, 01:36 PM   #125
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Some traffic volumes for the Tokyo area. (source: Japanese wikipedia).

Remember nearly all Tokyo expressways are 2x2 lanes.

Route C1 (Inner Circular): 120,000
Route C2 (Central Circular): 97,000
Route 1 (Ueno / Haneda): 47,000 (Tokyo airport vicinity)
Route 2 (Meguro): 45,000
Route 3 (Shibuya): 98,000
Route 4 (Shinjuku): 97,000
Route 5 (Ikebukuro): 90,000
Route 6 (Mukojima): 77,000
Route 7 (Komatsugawa): 57,000
Route 9 (Fukagawa): 56,000
Route 11 (Daiba): 68,000
Route S1 (Kawaguchi): 82,500

Under optimal alignement, 70,000 is about the limit for a free-flow situation (2x2 lanes). Tokyo's expressways are far from optimal alignement due to too compact interchanges and curves, so it's not a surprise most expressways are jammed a lot.
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Old October 29th, 2008, 01:44 PM   #126
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japan is indeed top of the world
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Old October 29th, 2008, 02:40 PM   #127
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Quote:
Originally Posted by castermaild55 View Post
Ohashi JC
they say 50% of expressways traffic jam is solved by this

What is this?
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Old October 29th, 2008, 02:41 PM   #128
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I think it's a loop. Near the Shibuya Route (#3).
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Old October 29th, 2008, 02:59 PM   #129
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Loop? What does that mean
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Old October 29th, 2008, 03:29 PM   #130
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Interchange looks like a building. Inside that loop structure is a expressway interchange.
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Old October 29th, 2008, 05:46 PM   #131
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Why would that solve traffic jams?
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Old October 29th, 2008, 06:21 PM   #132
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Because there's no beltway on the western side of Tokyo. Eastern and Northern side have the C2, which is planned to be a nearly full loop from the Bayshore Route.
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Old October 29th, 2008, 10:17 PM   #133
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Rainbow Bridge, Tokyo:
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Old October 30th, 2008, 01:11 AM   #134
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Quote:
Originally Posted by Timon91 View Post
Why would that solve traffic jams?
yep i was thinking that too... it's just an interchange in smaller area... and first time i saw something like that at all...
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Old October 31st, 2008, 12:31 AM   #135
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Can anyone describe what exactly is in that building? Or draw, or show some pic from the inside?
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Old October 31st, 2008, 12:37 AM   #136
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I think it's here
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Old October 31st, 2008, 12:43 AM   #137
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Is this loop (or whatever it is) just meant to turn around, or? I don't get it. And it isn't finished yet, right?
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Old October 31st, 2008, 12:47 AM   #138
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Does Chris mean the intersection between the expy's? I don't see any building over there....
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Old October 31st, 2008, 12:51 AM   #139
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Quote:
Originally Posted by Verso View Post
Is this loop (or whatever it is) just meant to turn around, or? I don't get it. And it isn't finished yet, right?
It is explained by this graphic:
http://img123.imageshack.us/img123/8992/008lwu8.jpg

Two tunnels are coming from the north as new section of the ring highway (http://img123.imageshack.us/img123/9...0230198nt1.jpg) and then spiral up in this building to finally intersect with the radial highway going from central Tokyo to the south-west (through Shibuya).

For me this is genious... to connect two highways, with such a height difference, on such a small area, in an urban setting... incredible.
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Old October 31st, 2008, 01:23 AM   #140
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I get it now, thanks. Really marvelus solution.
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