4 Shields can be steered by varying the thrust of the jacks from left side to right side or from top to bottom, thus varying the tunnel direction left or right or up or down. The jacks shove against the tunnel lining for each forward shove. The cycle of operation is forward shove ,line, muck, and then another forward shove. The shield used about 1955 on the third tube of the Lincoln Tunnel in New York City was 18 feet (5.5meters) long and 31.5 feet (9.6meters) in diameter. It was moved ahead 32 inches (81.2cm) per shove, permitting the fabrication of a 32-inch support ring behind it.
5 Sunken-tube tunnels. Where the riverbed subsoil is firm and the river current is not excessive,shore-fabricated tunnel sections can be towed over a prepared trench in the river bottom and suck into place to form a underwater tunnel. The first major prefabricated,floated,and sunken tunnel was the Detroit River Tunnel between Detroit and Windsor,Ontario.This vehicular tunnel was built in 1906-1910. The next important vehicular tunnel built by this method was the Posey Tube ,which was completed in 1928.It runs under a saltwater arm between Oakland and Alameda,Calif.Since then many other sunken-tube tunnels have been built under rivers and saltwater bodies,notbly the Transbay Tunnel between Oakland and San Francisco.
6 The cylindrical tunnel sections usually are made of steel in an onshore yard,Each section is about 300 feet (90 meters) long and 28 to 48 feet (8,5-14.6 meters) in diameter. After the openings at each end of a sevtion are closed with steel bulkheads, the tube is ready for launching in the manner of a ship . Once in the water, a section is ballasted with concrete until a minimum buoyancy is attained. Then the section is to the tunnel site. Before the arrival of the section,dredges and underwater excavators dig a trench to the proper depth of the tunnel.When the tube section is positioned precisely over its final location,additional concrete is added until the section sinks into prepared trench.All sections of the tunnel are transported and sunk in place in the same way.
《道路与桥梁工程专业英语》翻译
Professional English for Road and Bridge Engineering.
公路、桥梁工程专业英语翻译
Research is one of the most important aspects of scientific and engineering practice. A researcher usually works as a member of a team with other scientists and engineers. He or she is often employed in a laboratory that is financed by government or industry. Areas of research conne...
专业英语(土木工程专业“路桥方向”)文章 求翻译
在朝派ruban和郊区areas径流水域公亩处理通过a系统的排水srructures引去参考向某样的人雨水道和他们的appurtenances.The排水问题存在增加在朝派这些areas主要对于两reasoms:the不能透过的本质的区域创造a非常高度runoff;and那里存在很少寄宿为天然的东西流泪courses它存在常常becessary向收取整个猛袭waterinto ...
道路桥梁专业英语翻译 帮忙啊 各位大虾。。。(急)。。。
Soft-ground隧道掘进高线驱动的全部或大部分是通过柔软的材料。在很松软的地面,很少或根本没有爆破是必要的,因为这个材料容易挖掘。起初,forepoling是唯一的方法,为建设隧道通过地面很软很重的厚木板.Forepoles大约5英尺(1.5米)长,加剧了一点。他们被注入到顶部单杠的支撑的面部隧道。当时的forepoles赶进...
哪位英语专业人士帮忙翻译一下这三段文字!!哭求!!跪求!!
1、Natural scientist A Luo receive then, he, and companion health Cerney blue in · Der, in the once ocean is captured , have mounted parrot's shell trumpet submarine unexpectedly, thus begun to explore in the sea floor full of legendry. Parrot owner Buddhist nun of shell ...
哪位可以帮忙翻译下 土木工程专业英语的一段话.感谢,紧急.
手工翻译:deck、through,专有名词,如楼上所说,这里意译。In recent years,bridges can be divided into two kinds -"deck" or "through" types.近年来,桥梁可被划分为两种类型:“甲板型”和“贯穿型”。In the deck type of bridge, the roadway is above the supporting structure, that ...
哪位英语高手,帮我翻译下这篇小短文! 我感激不尽!!!
on a story, Drawing on political themes in the way to establish the value and significance of the incompetent performance of the ADC is not proper. One day, if the story not well, and failed to catch up with the opportunity to show his face, everything will be in vain. The...
哪位英语高手帮我把下面这段中文翻译成英文?我的毕业设计,谢谢大家!
mainly on the dredging of some of the knowledge, including six parts: (a) Dredging world history and current situation, (b) the world dredger status quo and development trend , (3) China's dredging history and current situation, (d) the development of China's need for dredging...
跪求 哪位英语高手帮我翻译一下下面的文字
is the important means that the university student obtains the information, the study knowledge, recreational amusement, is also important tool of their social association.Be a kind of new social intercourse method, have it the fresh and clear ages characteristics and the community applic...
用英语翻译一下下面的这段文字,谢谢!
I think that a best friend is the one who can make me feel warm and happy .she can help me when I feel helpless and warn me when I was pride .But the most important thing is she can understand what I am thinking about very clear . And , I should also doing like this...