本庄大橋に思う

本庄大橋の部材の鋼板にに錆が生じ、板の厚さが殆ど無くなっているところに重量車が通過し、板が切れてしまった。この橋は形式的にはトラスト呼ばれているもので、部材を3角形に組み合わせて作られている。トラスの下の方に車道と歩道がある。これらは、鉄筋コンクリートで作られている。通常は車道と歩道は離れており、その間に部材が通っている。ところが、前に、部材が切れているのが見つかった木曾大橋も同じだが、歩道のコンクリート床版は車道のそれと一体としており、トラス部材は床版コンクリートの中に埋め込まれている。この床版に埋め込まれている部分が錆びてしまったと云うわけだ。一般にコンクリートと鋼は相性が良く、コンクリートの中では鋼は錆びにくいとされてきた。ところが今回の場合は部材は鉄筋のように完全にコンクリートの中に埋め込まれているわけだはなく、部材とコンクリート床版との間はかすかな隙間ができる。そこに、塩などを含んだ水が入り、40年の間に錆びてしまったと云うわけだ。なぜ、このような設計をしたかといえば、コンクリートに対する過信と使用材料を倹約して経済的設計ができると云う利点があったと考えられる。橋には、あまり経済的であることを追及したり、力学に反するような設計をすることは問題じゃ。安物買いの銭失い!

Comments

[投稿情報: hogan usate]

578964579248488316233 [url=http://www.tvbialystok.com/hogan-usate-vendita-nuovo-hogan-usate-negozio-online/]hogan usate[/url] hogan usate

[投稿情報: hogan on line]

695367345100309791340 [url=http://www.tvbialystok.com/hogan-on-line-nuovi-arrivi-hogan-on-line-negozio-online/]hogan on line[/url] hogan on line

[投稿情報: hogan sito]

865555268454563567585 hogan sito http://www.tvbialystok.com/hogan-sito-ultime-hogan-sito-vendita-on-line/ hogan sito

[投稿情報: stock hogan]

916735755286237704591 stock hogan http://www.tvbialystok.com/stock-hogan-vendita-calda-stock-hogan-negozio/ stock hogan

[投稿情報: silk scarves uk]

We’ve considered Pattie Boyd to be our spirit animal ever since we first dove into Wonderful Tonight, and when her autobiography wasn’t delivering delicious tales of her epic love triangle with George Harrison and Eric Clapton (we’re Team Harrison, for the record), we got a firsthand account of what is was like being a supermodel during the cultural revolution that took place during late ’60s and early ’70s. While the music of the time had plenty to say, in many ways the fashion said what lyrics couldn’t. And while we often find ourselves going down the Tumblr rabbit hole of blogs dedicated solely to the styles of Mick Jagger and Jean Shrimpton, the notion of being able to see the far out garb from these eras in person leaves us weary with excitement.

[投稿情報: critmettedarp]

uBvcmJamaEqA Moncler Outlet xDvyuUqspReC Ugg Australia eXnorGiluTnS Canada Goose Jakke jGskqRnskArO Canada Goose oYxklOnjsNpL Isabel Marant Sneakers kRzljXxgoNzU Ugg Greece jYxqkClwtRxD Moncler Sverige vAjzjWtsbWrN Barbour Jacka iUnpfJvtpBfU Belstaff Cazadoras rVqhaUxttJbH Cheap Moncler Jackets

[投稿情報: QuarNuava]

sCwhaWmfjOuB Barbour Uk qNdokQsltQbB Chaquetas Belstaff cLipaGqjtExU Ugg Boots Sale iGiceQgffJwT Parajumpers Norge eBudxQjhcWxV Parajumpers cDmbsRegcHpC Barbour Jackets oOlmjZhqmOkW Woolrich Arctic Parka xHbelBvfpNvP Ugg Sko zZmzaIupqDoV Uggs Rea uFowmGcikDsD Cheap Uggs

[投稿情報: SitahTeat]

qHmrrYegpIeS UGG portugal cSturDkksMhT Moncler Jackets Ireland sWhajAaetGzL Ugg Italia yBnhdTlxtQyG Woolrich Outlet wFcqhMvfyFdI Canada Goose Pas Cher sBcenQcxqSaG Ugg Boots Deutschland nRedrNgxwLuH Woolrich Bologna zVvqnPmhaOmZ Belstaff Outlet xPmtgCkcqVgJ Ugg Baratas cPuijJfizQmS Moncler

[投稿情報: toobbebsibiat]

bYsjvGwhkUyH Ugg Saappaat xZrrtWnzxYsV Woolrich zStreSwnmGlS Barbour Jackets sLkmvVmcqBjG Isabel Marant Pas Cher zQkyeGiqhTfP Moncler Danmark zUjvpXevsPtZ Moncler iBbdzCxonHgX Uggs Boots Sale wWabxFduoStD Moncler qSukpNocvPsF Belstaff Jakke wVnqqUjnkGhJ Canada Goose Outlet

[投稿情報: critmettedarp]

aBkmxVfgdUnR Woolrich pEncoAvgxCaZ Barbour Sverige ePhahCktaCnO Canada Goose Uk hRfffYxfkLfO Canada Goose Wien tZvozKsmtWiJ Ugg Outlet uGsevKifxJwV Barbour Jackets iJxatUegvYcV Canada Goose Outlet yFrftKedxQlQ Barbour Jackets Sale jTgnaUmpdKdH Cheap Uggs Boots mSmubMewiEtH Ugg

[投稿情報: QuarNuava]

pByrqBjwhKtI Woolrich Jakke jWybuUejsJeF Canada Goose Rea iTnntNwscEiV Belstaff Uk mPpyaUhabMlU Belstaff zKucuCjowTxT Giacche Belstaff aQkswCozzRmG Woolrich Jassen hYshzGaatTpO Canada Goose Doudoune tEfcyEqpfPhR Canada Goose Sverige mGqfwBjsuIqI Canada Goose Jacke bHiegGhiuFtV Uggs Kopen

[投稿情報: QuarNuava]

kFnhwPwldXtW Moncler wQjebTkwiNqZ Ugg Pas Cher cAkxoDthuWpC Botas Ugg Baratas lUwihVyfrAiN mQemaWkkfUqW Moncler oQtpaKamwBhQ Canada Goose Pas Cher bLwskTwrcWxY Uggs Sale zMufoTjjmObG Belstaff Italia fEqtoVdzlCdZ Moncler Jacket fBfrtIvomFdF Canada Goose Stockmann

[投稿情報: intenihek]

xPpavLphzYyN Ugg Australia wGeegNveiDqJ Ugg bJlvcAwohLmJ Canada Goose Doudoune qEtheNwxhQsK Moncler Online pRnhyWceqXyN Uggs On Sale tObfuIojoNxE Parajumpers dHxsbLxyrCbW Ugg Online eYxemCtexCkH Parajumpers qDpxaEusuHcD Isabel Marant Dicker Boots eYdwnUcatEbG Canada Goose

[投稿情報: toobbebsibiat]

kEohdFrefRzR Ugg Australia gKcceWibiYbX Barbour lVuemItuhLwP Canada Goose Jakke eIzyhGcuzYnB Moncler Jackets Ireland aJvdfVmfoBgE Woolrich yNxhsHerfNoH Canada Goose qTzzdIrmyYlD Giubbotti Moncler nYorbMajeYnU Moncler Outlet dLtofSykjTjS Ugg Sale dFsqaTafwQnK Parajumpers Norge

[投稿情報: SitahTeat]

rRgazGzosSoK [url=http://www.proof-improved.co.uk/includes/barbour/]Barbour Uk[/url] nHdnpMolcImC [url=http://www.villinginvesi.fi/logs/uggs.html]Ugg Suomi[/url] nSmksMlfkGqW [url=http://www.lincolntourism.co.uk/logs/isabel-marant-sneakers/]Isabel Marant Wedge Sneakers[/url] oVkyjZnlvDyA [url=http://www.joomlatipset.se/modules/canada-goose.html]Canada Goose Rea[/url] lCcilHzpqUwY [url=http://www.dijoser.pt/includes/uggs.html]UGGs[/url] nUvtoXhafMoV [url=http://www.andreagaler.co.uk/media/belstaff.html]Belstaff Jackets[/url] kJjgmSnpjNiT [url=http://www.nmkgjovik.no/templates/beez/uggs.html]Uggs[/url] sCxqdPlahTlN [url=http://www.groupe-sce.fr/plugins/ugg-pas-cher.html]Bottes Ugg Pas Cher[/url] pJlmaVsncRqS [url=http://www.accademiadeileggieri.org/media/giubbotti-moncler/]Moncler[/url] nCyzzMdvqHdK [url=http://www.dijoser.pt/includes/moncler-jacket.html]moncler jacket[/url]

[投稿情報: SitahTeat]

wRkisDeqqHiK [url=http://www.dutchablechennai.nl/templates/moncler-jas.html]Moncler Jas[/url] iHuhzXaufRiQ [url=http://www.sustema.se/includes/ugg/]Uggs Rea[/url] wXvucGzslVtC [url=http://www.h2k.no/components/ugg.html]Ugg Norge[/url] jIjkdBfxtSiZ [url=http://www.logothetisautogas.gr/logs/ugg/]Ugg Boots Greece[/url] aExpqCiunRpA [url=http://www.groupe-sce.fr/plugins/moncler-pas-cher.html]Doudoune Moncler[/url] kZravHqpiMsD [url=http://www.gertzoptik.se/media/belstaff.html]Belstaff Jacka[/url] iLlmiSuuqQiD [url=http://www.sfpb.ie/logs/ugg.html]Uggs Boots Ireland[/url] xLomkDxxzRsK [url=http://www.parladori.it/logs/belstaff.html]Giacche Belstaff[/url] fMxakWmdnAoQ [url=http://www.tonet.ch/modules/moncler-online.html]Moncler[/url] rSsciBegnOyK [url=http://www.batterikongen.dk/modules/ugg.html]Ugg Støvler Tilbud[/url]

[投稿情報: critmettedarp]

jYnziVumcPtS [url=http://lgfoot.lavenir.net/components/chaussure-isabelle-marant.html]Chaussure Isabelle Marant[/url] hUkolGqhbTjU [url=http://www.samoffice.nl/libraries/moncler/]Moncler[/url] vVaaxZnmjZiH [url=http://www.lmsroadracing.se/tmp/database/canada-goose.html]Canada Goose[/url] yMnypDmqbPsM [url=http://www.mooi-hairbeauty.nl/components/uggs.html]Goedkope Uggs[/url] fBixaXufeJjM [url=http://www.icsguinizelli.it/logs/duvetica/]Duvetica Outlet[/url] mBghyAhigEaF [url=http://www.tonet.ch/modules/moncler-online.html]Moncler Jacken[/url] lSpjfBqsfGpK [url=http://www.gr8corp.com.au/newsletter/oakley/]Oakley Sunglasses Australia[/url] pLlahChuvTlL [url=http://www.samoffice.nl/libraries/uggs/]Goedkope Uggs[/url] oGuyyAxkqDhL [url=http://www.masterwax.it/templates/ugg/]Ugg Italia[/url] cBuheWkanPrZ [url=http://www.sunsetpictures.ca/cache/canada-goose/]Canada Goose[/url]

[投稿情報: QuarNuava]

aDvfcQnlyUmV [url=http://www.klubkomm.de/logs/uggs.html]UGGs[/url] jBhfzPwixDxR [url=http://www.parladori.it/logs/giubbotti-moncler.html]Moncler Outlet[/url] oJgneYmheLxC [url=http://www.clubpresse-anjou.fr/logs/moncler/]Doudoune Moncler[/url] cLfczFzurTwG [url=http://www.diy-hq.net/includes/ugg/]Uggs On Sale[/url] cRydeFsfaAtR [url=http://www.masterwax.it/modules/duvetica/]Duvetica Piumini Outlet[/url] iHxiyYeseVkL [url=http://www.schuletriengen.ch/joomla/cache/ugg.html]Ugg Boots Schweiz[/url] wUtzvAnpsYbL [url=http://www.comnia.se/bl/data/woolrich.html]Woolrich Jacka[/url] jYoirMxloCrN [url=http://www.stallrex.se/components/canada-goose.html]Canada Goose Sverige[/url] sFoplNahxUmQ [url=http://www.gertzoptik.se/media/belstaff.html]Belstaff[/url] gPjhjAnvhRjC [url=http://mathfinance.sns.it/templates/moncler.html]Moncler[/url]

[投稿情報: critmettedarp]

lTihdYditMkG [url=http://www.sociologiapplicata.it/media/canada-goose/]Canada Goose Italia[/url] mGgxxFgnyAeI [url=http://www.samoffice.nl/plugins/canada-goose-nederland.html]Canada Goose Outlet[/url] qJlnaTejpVlU [url=http://www.icsguinizelli.it/plugins/peuterey-roma.html]Peuterey[/url] xKwaaNkgkGwV [url=http://www.dijoser.pt/includes/moncler/]Moncler[/url] aYpkjOlttUhD [url=http://www.lmsroadracing.se/cache/canada-goose/]Canada Goose Stockholm[/url] 锘縠NcdnPftmNfR [url=http://www.comhaltastlachtga.ie/includes/ugg.html]Uggs Boots Ireland[/url] eDvfuQppaDiH [url=http://www.parladori.it/logs/duvetica/]Duvetica[/url] eCnjiYuidIxM [url=http://www.topfloorcarpets.co.uk/includes/isabel-marant-uk.html]Isabel Marant Shoes[/url] vSvjaIrwzOeY [url=http://www.cumulus-support.no/libraries/fof/uggs.html]Uggs Norge[/url] cXmblEngzXvN [url=http://www.dutchablechennai.nl/libraries/uggs/]Uggs[/url]

[投稿情報: SitahTeat]

hMwrjMsqwUeD [url=http://www.parladori.it/logs/spaccio-woolrich.html]Woolrich[/url] sSdtzSvikKfV [url=http://www.logothetisautogas.gr/logs/ugg/]Ugg Boots[/url] gHsdrTdlvQdI [url=http://www.sutostainu.it/logs/peuterey/]Peuterey Piumini[/url] zHnnpHefiUrM [url=http://www.mooi-groesbeek.nl/includes/moncler-jas.html]Moncler[/url] jZywtSfrkMlX [url=http://www.fials.no/libraries/openid/canada-goose.html]Canada Goose Norge Nettbutikk[/url] mDvggKwnnAwM [url=http://www.easysdi.org/logs/isabel-marant-boots.html]Isabel Marant Sneakers[/url] nIhlxUhqoIiG [url=http://www.trynorway.no/includes/domit/uggs.html]Uggs Norge[/url] hUvpmMaycKwA [url=http://www.comunecastrezzato.it/logs/ugg-boots-italia.html]Ugg Boots Italia[/url] pYaziTxzzIfX [url=http://www.comunecastrezzato.it/cache/peuterey/]Giacche Belstaff[/url] rKtrqIcpsNsJ [url=http://www.puvab.se/includes/woolrich/]Woolrich[/url]

[投稿情報: QuarNuava]

xVfewLlzgSkI [url=http://www.fials.no/cache/canada-goose/]Canada Goose Norge[/url] lJvqtBkhwIyP [url=http://www.easysdi.org/logs/isabel-marant-boots.html]Isabel Marant Boots[/url] jPwchTqqpEwS [url=http://www.ossa.gr/includes/uggs/]Ugg Μποτες[/url] oSvezMgkxQvS [url=http://www.rckkenya.org/includes/moncler.html]Moncler Jackets Uk[/url] uNyxkRwihUuM [url=http://www.masterwax.it/templates/ugg/]Stivali Ugg[/url] fQkhgJmhvMzH [url=http://www.gr8corp.com.au/newsletter/oakley/]Oakley Sunglasses Australia[/url] tMafdPnarQyK [url=http://www.delicesdegentinnes.be/libraries/moncler-online.html]Moncler Online[/url] nUjxwJsrjLfZ [url=http://www.clubpresse-anjou.fr/logs/canada-goose.html]Doudoune Canada Goose[/url] lNqvvYwqiNoR [url=http://www.lmsroadracing.se/cache/canada-goose/]Canada Goose[/url] jCpeoAfbkZsE [url=http://www.groupe-sce.fr/logs/canada-goose-doudoune.html]Canada Goose Solde[/url]

[投稿情報: critmettedarp]

dFreeJqaxXwS [url=http://www.clubpresse-anjou.fr/logs/moncler-pas-cher.html]Moncler Pas Cher[/url] rXdcgFiweIoM [url=http://www.parladori.it/logs/spaccio-woolrich.html]Woolrich[/url] gGupiYcxrRcF [url=http://www.groupe-sce.fr/logs/canada-goose/]Canada Goose[/url] hIgqbLxlkPhY [url=http://www.xscape.pl/templates/ugg-polska.html]Ugg[/url] oIxtjRntpAyP [url=http://www.rasch4you.at/plugins/content/canada-goose-parka.html]Canada Goose Jacke[/url] yThtcZqclLbX [url=http://www.koffieservicedirekt.nl/components/moncler-jas.html]Moncler[/url] cZewnNftrMzM [url=http://www.bekkefaretspeiderne.no/modules/uggs/]Uggs[/url] cRtmgSoslGrO [url=http://www.sorgues-du-comtat.com/templates/canada-goose.html]Canada Goose Pas Cher[/url] eGygwSoyuTrC [url=http://www.reiki-land.de/media/jce/belstaff.html]Belstaff Outlet[/url] lGkvoVuylMoP [url=http://www.halshotel.dk/includes/canada-goose/]Canada Goose Danmark[/url]

[投稿情報: critmettedarp]

kVhveLakrJgQ [url=http://www.cosmed.fr/includes/ugg.html]Ugg Pas Cher[/url] yXabtPpfnWaR [url=http://www.parladori.it/logs/giubbotti-moncler.html]Moncler Outlet[/url] nDylfHojuXiF [url=http://www.cosmed.fr/cache/ugg.html]Bottes Ugg Pas Cher[/url] oQwvxAbxnVyK [url=http://www.supportgruppen.dk/libraries/canada-goose.html]Canada Goose Danmark[/url] mKddaCedwBrZ [url=http://www.reiki-land.de/logs/ugg-sale.html]Ugg Boots Deutschland[/url] eMjffVahsEcV [url=http://www.nugat.com.pl/libraries/ugg.html]Ugg[/url] iGqmzTpfzBnT [url=http://www.uturnuk.org/logs/isabel-marant-boots/]Isabel Marant Boots[/url] wMbpcQvcbFcF [url=http://www.foerderverein-hfc.de/cache/ugg-boots.html]Ugg Boots Sale[/url] pQeeyAjaiToY [url=http://www.lowiczsportacademy.pl/includes/moncler.html]Moncler Polska[/url] hWmmfApvnWgO [url=http://www.eldata.se/logs/moncler.html]Moncler[/url]

[投稿情報: QuarNuava]

lIqxwFmutRkJ [url=http://www.parladori.it/test/config.html]Hogan Scarpe[/url] hSzdvLcusIqB [url=http://www.grafiskgourmet.dk/logs/woolrich/]Woolrich[/url] wGxnsAcraUpC [url=http://fr.rsm-rsa.com/media/canada-goose.html]Canada Goose Pas Cher[/url] xPzofEyooNnP [url=http://www.comunecastrezzato.it/plugins/moncler-italia.html]Moncler Italia[/url] bJuzaMlxvErL [url=http://www.eo2.fr/export/net.html]Isabel Marant Pas Cher[/url] iSctsPemrCsB [url=http://www.viford.com]viford.com[/url] bNgwhKndzUuN [url=http://www.eldata.se/media/moncler/]Moncler Stockholm[/url] hEzjxSvzgFtH [url=http://www.partyquijote.es/descargas/router.html]Bolsos Michael Kors[/url] uRafoMudmJiK [url=http://www.andreagaler.co.uk/plugins/tmp/tooltip.html]Michael Kors Bags[/url] kIziwLjurQiE [url=http://www.sociologiapplicata.it/media/canada-goose/]Canada Goose Italia[/url]

[投稿情報: fleedsViejess]

pUwaeAkvnEuG [url=http://www.comunecarimate.it/logs/canada-goose-jacket.html]Canada Goose Italia[/url] fKenmUdzbUcZ [url=http://www.pagery.com.pl/templates/canada-goose.html]Canada Goose Kurtka[/url] oLcxnPptkItQ [url=http://www.castor-suedblockade.de/doc/dio/canada-goose-outlet.html]Canada Goose[/url] mHanxWlbsBrA [url=http://www.rakennusurakointilehtonen.fi/cache/canada-goose/]Canada Goose Stockmann[/url] qLytyQagyRuU [url=http://www.samoffice.nl/libraries/moncler/]Moncler Outlet[/url] qMfrvUzlfOuY [url=http://fr.rsm-rsa.com/media/moncler-pas-cher.html]Moncler Pas Cher[/url] jYchaQdbxMpF [url=http://www.clubpresse-anjou.fr/logs/moncler-pas-cher.html]Moncler Doudoune[/url] bIredExexQfN [url=http://www.baltimore.ie/cache/moncler/]Moncler Jackets Uk[/url] nChsjWgcuQjJ [url=http://www.e-television.es/media/ugg/]Ugg España[/url] jJlqoNeozGeJ [url=http://www.tselios-catering.gr/includes/ugg.html]Ugg Μποτες[/url]