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Friday, April 5, 2019

Establishing a TBM on Site

Establishing a TBM on SiteSRV P2.Our tutor gave us an OSBM and we had to lay downwardly a TBM on site by carrying out a series of flying take aims. The equipment I employ was a dumpy take aim, a tripod cornerstone and a staff. We started by setting our equipment up, we had to make sure the stand was at an appropriate height that suited you and that the dumpy level was do level by sort outing it so the bubble was in the middle. Someone accordingly stood at the point with the staff which we were asked to measure, in our case it was the drains. We made note of the measurement thuslyce moved the person with the staff moved to the next point. We and and so had to adjust the dumpy level to make it level again before we took another measurement. We kept the dumpy level in the same place until the staff got so far away that when we looked through the dumpy level it looked over the staff. This is when we moved the dumpy level this would be our starting time change point. It conti nued until we reached the TBM.SRV M1.My Collimation method looks homogeneousSRV P1.When our group carried out a linear survey surrounding a plot of land we first set up our ranging poles, these are cylinder shaped timber poles which are usually 2.5mm in length. We then used a fibreglass tape to measure the distance of each object from each pole. The trueness of nearly measurements whitethorn be affected by a range of different reasons, for example shift If, on a 30m tape, the difference in height at each end is less than 600mm then accuracy can be achieved.Sag If the distance being measured was in an arc then the tape should sag more than 300mm in the centre of a 30m tape.Temperature If it is warmer than 20c then this may cause the tape to expand or contract if it is cooler. However, if the temperature does not vary from 18c then accuracy can be achieved.Tension To impede the tape from sagging it may be pulled, this results in the tape stretching. These can often be avoided.E rrors can also occur whilst booking and measuring. Examples of some errors could be, miscounting, misreading and recording the wrong measurement. If these mistakes do not get noticed early enough then the survey will squander to be redone. The best way to avoid these mistakes is to double check that what you have written is the same as the measurement you have just read. However, not all errors are down to the person conducting the survey. Some errors may occur due to poor equipment. For example, using a tape that has spread out due to exposure to a high temperature or a tape that has been permanently stretched whilst trying to prevent it from sagging. You can prevent this by comparing the tape to a standard steel tape. Some errors may just be small. The surveyor could be short sighted therefore his readings are affected. The only way to cross this error is for the surveyor to repeatedly check their readings.

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