Bridges and Tunnels

It's an arch.

most are prevailing wage jobs and greatly varies from state to state,im in the union so its a big difference . anywhere from 30 to 50 dollars an hour,again depending on what part of the country you are working

Slump check does not measure strength. It measures workability. Workability is the ease with which concrete can be placed in position. Correct as far as it goes! Slump refers to workability however it is also, all telling as to the water content of the mix. The more water, the easier it will work! Problem becomes, too much water will increase the porosity making the concrete weak and susceptible to early degradation because contaminates are able to enter and commence corrosion of embedded steel. A concrete that is easy to work that has a high water content [ more than .40 ] is known for shrinkage cracking due to rapid evaporation of the high water content. These cracks caused by rapid loss of water decrease compressive strength and invite early corrosion. This type of concrete also experiences, curling and ASR as well as efflorescence in a very short time period. Strength is a function of correct hydration, slow internal curing and careful design of a mix for the intended service criteria and not a whole lot to do with slump!

triangle ANS 2 - There is no 'best shape' - each bridge is designed for a particular place and can be almost any kind of construction.

A total of 27 bridges cross the Han River are From the west to the east Hangang Railway Bridge and Hangang Bridge Ilsan Bridge; 일산대교 Gimpo Bridge; 김포대교 Haengju Bridge; 행주대교 Banghwa Bridge; 방화대교 Gayang Bridge; 가양대교 Seongsan Bridge; 성산대교 Yanghwa Bridge; 양화대교 Dangsan Railway Bridge; 당산철교 Seogang Bridge; 서강대교 Mapo Bridge; 마포대교 Wonhyo Bridge; 원효대교 Hangang Railway Bridge; 한강철교 Hangang Bridge; 한강대교 Dongjak Bridge; 동작대교 Banpo Bridge with Jamsu Bridge; 반포대교와 잠수교 Hannam Bridge; 한남대교 Dongho Bridge; 동호대교 Seongsu Bridge; 성수대교 Yeongdong Bridge; 영동대교 Cheongdam Bridge; 청담대교 Jamsil Bridge; 잠실대교 Jamsil Railway Bridge; 잠실철교 Olympic Bridge; 올림픽대교 Cheonho Bridge; 천호대교 Gwangjin Bridge; 광진교 Gangdong Bridge; 강동대교 Paldang Bridge; 팔당대교

The swing bridge has very long spans, and behaves better in earthquakes then heavy rigid bridges. ANS 2 -Swing bridges can allow passage of very wide and high ships in a waterway.

1779, made of sast iron and was constructed in Coalbrookdale, England ANS 2 - constructed of 'Cast iron' , and is still in use today.

With trusses you can obtain high strength of the bridge using rather thin and simple (i.e. cheap) elements. A drawback is that the required height of the side of the bridge rises with the span of the bridge, so trusses become less effective for larger spans compared to the cable bridges. Railway bridges have to sustain higher load than road bridges (trains are heavier), so trusses are an efficient design to increase strength.

Truss bridges are lighter than beam girder bridges. They take up more height but are strong and carry loadd in tension and compression rather than bending.

The idea came up in 1802, construction began in 1988, and it was opened in 1994. Does that answer your question?

The mixes of grades M5 M10, M15, M20 and M25 correspond approximately to the mix proportions (1:4:8), (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively.

the bridge having a deck from where truck n all vehicles pass by having a pratt which bridge is having...

Well, as far as I know, the beam bridge is inefficient compared to other bridges. Single piece beam bridges made from wood or any other easily bent material deflects.

In this M refer to Maximum compressive strength and 20 refer that concrete that with stand upto 20KN compressive strength.

Goren bridge counting system

If I under stand your question correctly, you are asking a technical question : What is CRS bar? CRS is Corrosion Resistant Steel reinforcement bars used in Reinforced Cement Concrete. This is not as good as Stainless steel, but better than ordinary Reinforcement bars and is manufactured by some manufacturers like Tata Steel (in India) by giving some surface chemical treatment to the bars. Trust this answers your question.

a key stone

Xerxes used and bridge called the "Pontoon" bridge which is a colum of boats tied together side by side to get across the Hellespont (Dardanelles).

suspention

A cable suspension bridge is a kind of bridge hung from cables.

Type your answer here.. The outer columns of any bridge or culvert is called Abutment .There is two abutments in one bridge and inner columns of bridge is called piers. Hence there is more piers in one bridges but there is just two Abutments in one columns .

It can hold whatever it's designed to hold, there's no definite limit. If you want it stronger, just add more/thicker cables.. Got that from another website. abUT i REALY WANT TO KNOW.. How does the bridge withstand the loads placed upon it? PLZZ ANSWER IT! Read more: http://wiki.answers.com/Q/How_much_can_a_cable-stayed_bridge_hold#ixzz1KRVjd3Zs

Manhattan is 13.4 miles (21.6 kilometers) long and 2.3 miles (3.7 kilometers) wide at its widest point.

like it an awesome bridge ANS 2 - It's called 'cantilever' because of the way it was built. Nothing to do with 'how it works' - It spans a gap just like any other bridge.

There is a competition between the plants for light,water and soil nutrients and the harvesting of one crop component can damage the others.