Civil Engineering

A tunnel boring machine (TBM) is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They can bore through hard rock, sand, and almost anything in between. Tunnel diameters can range from a metre (done with micro-TBMs) to 19 metres. Tunnels of less than a metre or so in diameter are typically done by horizontal directional drilling rather than TBMs.

Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional 'hand mining' in soil. A TBM has the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in heavily urbanized areas. The major disadvantage is the upfront cost. TBMs are expensive to construct, difficult to transport and require significant infrastructure. The biggest is built by Herrenknecht AG of Schwanau, Germany to dig the 57km Gotthard Base Tunnel. It has a diameter of 19 meters.

The diagonal terms give the variances. The square root of which gives the standard deviations. The diagonal terms give the variances. The square root of which gives the standard deviations.

There is no such thing as normal water pressure, it is changing all the time due to demand in the water distribution system. If a PRV is needed then the pressure is higher upstream than is wanted.

48"

A scale model of a Roman aqueduct will have water flowing from a higher source into a series of channels. An easy way to accomplish this would be to stack different size plastic bowls, with the smallest at the top. Each bowl will have a small hole in the bottom for drainage. The bottom bowl could be sitting on a piece of sod with ditches cut into it.

seam less pipes are having with out weld but produced by extension process it is costly than seam

vicats apparatus is used for initial setting time of cement.

it is the process of densifying granular soils. especially soils with silt content upto 20%

HV = 2.9 * Y Where HV - Vickers hardness Y - Yiekd stress in KG/mm2

None. Jet engines don't have cylinders.

While Jet engines don't have cylinders they have combustors (which can also be called combustion chambers). Due to turbulence and other problems early jet engines had multiple small combustors, most modern jet engines have only one large combustor as it is simpler to build. some jets have combustion 'cans' which are cylinders but have no moving parts within

"Load bearing" is a term used to describe any structure or support system designed to bear a load of some sort. "High load bearing," by definition, implies that the item will hold heavier weights and higher levels of stress.

2

Are standard two way road in Britain is 12 feet. That's all I know.

Er... you press on it and see. If you can press on the release bar with 90 N of force (basically 9 kg or 20 lb) for 15 seconds without the door opening, it fails. This includes the pressure of the door latch release and any spring/hydraulic door closer. (For the latter, only force to initial travel is an issue, not force to open wide.)

You can often get a statement from a manufacturer, but you can also measure directly: just get a cheap postal scale with enough capacity, turn it on its side, and press with it. Multiply the reading by 9.8 N/kg. That won't be super-accurate, but as long as the measured force is below 90 N with more safety margin than the inaccuracy of your measurement, you've proved it. (Don't forget that the scale will read low, i.e. negative, when turned on its side, so you have to re-zero it or mathematically adjust for the negative starting point of the measurement.)

As a practical matter, most fire door hardware is far enough below the limit that a very crude measurement is sufficient; the fire inspector just presses on it with his or her "calibrated arm" and can tell that there's no need to measure more precisely.

If you're working close to the limit, the NRC probably knows about test procedures.

rror code e-86 for most topcons is a communication error between the instrument and the data collector. MOst common causes are a loose/bad cable or low batterypower in the collector.

Go there by plane

10 length

A construction joint is required to allow the structure to be built. Say there is an existing structure in the way of a wall. Part of the wall is built, then later the existing bit is removed, and the rest of the wall constructed. The place where the first and second parts of the wall meet is a construction joint. This kind of joint is usually built so that no movement is allowed. An expansion joint is one that allows movement between the two elements. There will be a comparitely soft material, such as rubber, asphalt or impregnated board placed between the parts. The latest innovation has lead to use non bituminous filler boards like polymer based HD100 board. It is also known as micro cellular filler boards. (More details about filler boards you have to visit hd100.in or kampun.com from there in-depth product knowledge available.) If it is concrete construction, any reinforcing bars will be arranged to allow movement. In most cases, if movement was prevented, the structure would crack or buckle. The joint allows controlled movement.

For last two decades, we are in industry and supplying required range of colour coated roofing sheets, there are high numbers of designs and various metal roofing sheets are offered. According to place and shape, we manufacture roofs that are suitable to your business needs. It might be size or shape; it can help you out undoubtedly. Low in maintenance and comfort in design is assured from us. Standard of manufacturing and shaping it in affordable price can be competitive in the market and there is an expected service for customers as and when it is required to clients who are using our products. We are one of the leading manufacturing companies in India for developing material that we offer in variety of range and colours.

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Not being an engineer but having worked at a narrow-gauge and diesel railway theme park, I know that it was because of the mountain curves that narrow-gauge rails were used in logging to accommodate them because the larger gauge rails could not; "transition curve" sounds like it's a very gradual turn that ever narrows into the required tighter radius.

when reading a blueprint, a general tolerance would apply for all dimensions that are not individually identified. eg, all tolerances are +\- .030" General tolerances are normally found in the information blocks of the blueprint. If for example a tighter tolerance is required, then a specific tolerance is noted for certain areas of the blueprint. These tolerances are normally found beside the affected area.

There are 8 squares to an acre. a "Square" of land is approximately four hundred and five (405) square metres or 16 perches. Please note for clarity that 40 perches are equal to a quarter of an acre of land.

88 MPa.m-1/2

Maths is a must. Physics is also a very good idea since engineering in general deals with the weights, lengths and its effects etc.

i am not sure it might be 250 ml