【正文】 跨徑 90米，橫跨 M62公路和巴利 A665公路與 Prestwick 公路銜接，與 A665 公路最小橋下凈空高度為 ，與 M62公路的橋下凈空 則大約為 米。 根據(jù)檢測(cè)出的問題作出判斷。 雷達(dá)測(cè)繪為主 內(nèi)徑表面檢查儀檢驗(yàn)裂縫為輔 在完成對(duì)橋梁結(jié)構(gòu)雷達(dá)檢測(cè)后，再使用內(nèi)徑表面檢 查儀來驗(yàn)證被預(yù)知的裂縫。首先通過磁帶記錄下數(shù)字化雷達(dá)所掃描到的原始數(shù)據(jù)，再通過相關(guān)的設(shè)置和處理程序轉(zhuǎn)化為精確和可靠的數(shù)據(jù)。 雷達(dá)脈沖波檢測(cè)技術(shù)的運(yùn)用大大增加了對(duì) Besses o’ th’ Barn鐵路 橋評(píng)估結(jié)論的可信度。最低頻率的穿透能力最強(qiáng)，但是分辯率最低。 顯然，鉸接縫處鋼筋束完全暴露在外是不切實(shí)際的，因此相比較而言，用雷達(dá)檢測(cè)鋼筋束管道中的孔隙十分高效的，慶幸的是通過鉸接縫的放置鋼絞束的鋼制管道是斷開的，可以用雷達(dá)檢測(cè)管道槽內(nèi)的鋼絞束和孔隙。 鉸接縫和支座處有關(guān)排水裝置各種的問題。物理檢查、非損傷雷達(dá)檢測(cè)及其它的研究方法均已被用來去調(diào)查橋梁中潛在的缺陷。 隨著經(jīng)濟(jì)和政治的發(fā)展，土木工程，尤其是橋梁工程至今沒能形成某種統(tǒng)一陣線。 關(guān)于知識(shí)的傳播，目前似乎已出現(xiàn)了 2種非常不同的方式、英美主要集中于在相關(guān)期刊出版物上發(fā)表首要的研究成果，例如 ASCE、 LCE及其它期刊，而歐洲內(nèi)陸國家主要集中于在專門會(huì)議上展示其重要的研究成果，后者存在著局限性，新的研究成果的發(fā)布受到了限制。因?yàn)檫@ 種橋梁可能會(huì)毫無預(yù)兆地出現(xiàn)脆性斷裂，后張法鋼絞線在預(yù)制段搭接部位的防腐工作是影響這種類型橋梁長(zhǎng)期穩(wěn)定性的主要因素。 現(xiàn)澆混凝土表面大片的剝落部位和暴露在外的生銹的加強(qiáng)筋。 為了對(duì)比，選定了 10 個(gè)觀測(cè)孔，小孔是垂直向下鉆進(jìn)導(dǎo)管。這種轉(zhuǎn)換是使用一種 16 位的模擬信號(hào)變流器，它能使數(shù)據(jù)獲得相當(dāng)高的分辨率，以便用于后續(xù)的數(shù)據(jù)處理。 Bridge research in Europe A brief outline is given of the development of the European Union, together with the research platform in Europe. The special case of posttensioned bridges in the UK is discussed. In order to illustrate the type of European research being undertaken, an example is given from the University of Edinburgh portfolio: relating to the identification of voids in posttensioned concrete bridges using digital impulse radar. Introduction The challenge in any research arena is to harness the findings of different research groups to identify a coherent mass of data, which enables research and practice to be better focused. A particular challenge exists with respect to Europe where language barriers are inevitably very significant. The European Community was formed in the 1960s based upon a political will within continental Europe to avoid the European civil wars, which developed into World War 2 from 1939 to 1945. The strong political motivation formed the original munity of which Britain was not a member. Many of the continental countries saw Britain’s interest as being purely economic. The 1970s saw Britain joining what was then the European Economic Community (EEC) and the 1990s has seen the widening of the munity to a European Union, EU, with certain political goals together with the objective of a mon European currency. Notwithstanding these financial and political developments, civil engineering and bridge engineering in particular have found great difficulty in forming any kind of mon thread. Indeed the educational systems for University training are quite different between Britain and the European continental countries. The formation of the EU funding schemes —. Socrates, Brite Euram and other programs have helped significantly. The Socrates scheme is based upon the exchange of students between Universities in different member states. The Brite Euram scheme has involved technical research grants given to consortia of academics and industrial partners within a number of the states— a Brite Euram bid would normally be led by an industrialist. In terms of dissemination of knowledge, two quite different strands appear to have emerged. The UK and the USA have concentrated primarily upon disseminating basic research in refereed journal publications: ASCE, ICE and other journals. Whereas the continental Europeans have frequently disseminated basic research at conferences where the circulation of the proceedings is restricted. Additionally, language barriers have proved to be very difficult to break down. In countries where English is a strong second language there has been enthusiastic participation in international conferences based within continental Europe —. Germany, Italy, Belgium, The Netherlands and Switzerland. However, countries where English is not a strong second language have been hesitant participants }—. France. European research Examples of research relating to bridges in Europe can be divided into three types of structure: Masonry arch bridges Britain has the largest stock of masonry arch bridges. In certain regions of the UK up to 60% of the road bridges are historic stone masonry arch br