Diego Alonso Cacheiro– Maltby Surveys

Contents Stations

Description………………………………………………………………………………………………………… Page 04

Stations location map……………………………………………………………………………………………………... Page 07

Chainage Field Sheets……………………………………………………………………………………………………… Page 08

Stadia Tachiometry…………………………………………………………………………………………………………. Page 10

Radial Observation …………………..………………………………………………………………………………….… Page 11

Calculation of Angles…………………………………………………………………………………………………….… Page 12

Cross Brace Calculation…………………………………………………………………………………………………... Page 13

Traverse Calculation……………………………………………………………………………………………………….. Page 14

Co-ordinated Points………………………………………………………………………………………………………... Page 15

Method Statement…………………………………………………………………………………………………………. Page 16

Risk Assesment……………………………………………………………………………………………………………….. Page 17

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Survey Report…………………………………………………………………………………………………………………. Page 18

Assistance……………………………………………………………………………………………………………………….. Page 18

Summary………………………………………………………………………………………………………………………… Page 19

Specification……………………………………………………………………………………………………………………. Page 19

Survey Site………………………………………………………………………………………………………………………. Page 19

Survey Planning………………………………………………………………………………………………………………. Page 19

Equipment List………………………………………………………………………………………………………………… Page 20

Conclusion………………………………………………………………………………………………………………………. Page 21

Drawing…………………………………………………………………………………………………………………………… Page 22

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STATIONS LOCATION MAP

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METHOD STATEMENT* Proposed Site Survey Work: Springfield Farm , Scaynes Hill

* Company: Maltby Land Surveys

* Client: Andrew Crumpler

* Dates: 01/11/2015

* Personnel:

- Diego Alonso: Surveyor

- Nerea Buenavida: Assistant

* Working On Site:

- The work to be carried out on the site will involve the use of a total station (Geomax Zoom80) which will be used to measure distances and angles, it will also involve a level device (Leica NA720) to measure the levels of stations and surrounding areas.

- All permanent control station established during the course of the survey will take the form of PK nails hammered into the floor.

- The survey will be carried out by two personnel from Maltby Land Surveys.

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RISK ASSESMENTBefore I carried out my work I had to produce a risk assessment to highlight and eradicate the chances of any accidents/injuries to myself, my colleague, the public, or any of my kit at the specific site. During the process of drawing up my risk assessment I thought of any dangers that could occur and if they were to occur I thought of how I could make sure to the best of my abilities these did not happen. Whilist planning my survey I visited the site and carried out a site walk to plan how to carry out my survey in the safest possible way and to also highlight the main risks which could be a problem. As the survey was carried out nowhere near a main road the risks were minimalized instantly. The main risk would be a trip hazard for a member of public either tripping up over a tripod or an instrument box, which is alsoa risk for damage of kit. The best way to eradicate this risk was to put cones aroundeach of the tripods, leave the instrument box underneath the tripod when the instrument was safely placed and screwed on top of the tripod and to also put the stations out the way as best as possible.

Activity/Task Hazard Actionrequired

PersonsResponsible

Residual Risk

General Site Work

Trip hazard of tripods and boxes.

All stations will be attempted to be kept out the way as bes as possible.Boxes will be left under tripods when not needed.

Surveyor/Assistant Members of the public tripping over and injuring themselves. Sureyor and Assistant being injured.

General Site Work

Slipping over in muddy conditions.

Suitale footwear to be worn.

Surveyor/Assistant Surveyor or assistant being injured by slippingover.

General Site Work

Member of public falling over a tripod.

All stations will be kept out the way as much as possible and also barrier protected.

Surveyor/Assistant Member of public injuring themselves. Damage to kit.

General Site Work

Slipping over into the Lake

Suitale footwear to be worn and be aware.

Surveyor/Assistant Surveyor or assistant being injured by slippingover into the lake.

The staff involved on this project will wear appropiate safety clothing, approved high

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visibility jackets and steel toe capped boots when engaging on surveying operationsand once arriving on site.

The project manager can be contacted at the main office located in Haywards Heath. Mobile phone numbers of all site staff can also be obtained from Maltby LandSurveys main office.

SURVEY REPORTAfter placing the control I created the station descriptions. This ensured the survey stations could be relocated if extra survey work was needed, or if there were any errors in control, which would result in a site revisit.

My next part of the survey was to undertake the instrument work. I began by settingmy instrument, on Station 3. From here, I observed Station 1 as my backsight and also took a measurement to Station 2. After setting my Station 3 observed XXXXX points of detail.

After collecting the detail from Station 3, I did another check shot to my reference object, Station 1 to ensure the Total Station has not moved during the survey.

Next, I moved to Station 1 where I would measure detail usingusing chain and offset. This is an old-fashioned method of surveying but it is still used for setting out, when a very high degree of accuracy is not needed. To complete this part of thesurvey I set a tape between Station 1 and Station2. I measured points of detail using a second tape, measuring at right angles to the main tape.

My final point of survey was done measuring detail using my NA720 level and levelling staff. The method of survey here would be Stadia Tachiometry, which involved recording three different measurement per point. Whilist at Station 2, I took check shots to my other Stations. I thought this would be helpful despite knowing the accuracy of distance here would only be to the nearest 0.1 metres. using chain and offset.

The Bottom of Bank, Top of Bank, Footpath, and Sand detail was surveyed with the Total Station for identification purpouses.

ASSISTANCEDuring the Survey, I received assistance from a senior surveyor from my company so this helped as she was able to check over what I was doing and make sure I was completing the process correctly to save having to revisit the site.

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SUMMARYAfter surveying using the three different methods, I made some interesting discoveries. I found using the tape and offset method of survey surprisingly quick and efficient. The main problems I could see with using the chain and offset methodwas failing to measure off the chain at a 90 degree angle, which would misplace anydetail. I found that I had to be careful when surveying using the NA720 level as I was reading the three lines of the level I had to ensure I was not rushing and reading the wrong level as this would have resulted in an inaccurate survey.

I was pleased with the results of my traverse and the data I had collected and I´m confident that it is to a suitable degree of accuracy after clocing my triangle traverse. I was pleased with the calculated angles and did not feel the need to check any of the measurements at a further date after calculating and correcting them. I learnt the importance of doing check shots as I had further confidence in mysurvey due to extra measurements.

SPECIFICATIONFor this practice, I was asked to plan and complete a survey using three methods of measurement, which should include three survey stations. To do this I needed to setup on all of my stations and measure the distances of the sides of the traverse. I was also told to measure detail with different equipment. I needed to collect between 20 - 30 points of detail using a total Station, 20 - 30 points using Stadia Tachiometry and up to 30 points using the Tape and Offset method. I would then need to record this date and process it towards producing a plan with all three data sets plotted, to scale, on an A2 sheet.

SURVEY SITEAfter I found out the location of the site to be surveyed I looked on Google Maps as a convenient way to view the area.

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SURVEY PLANNINGBefore my survey was to begin I visited the site so that I could anticipate methods of surveying to be used and to check if there would be any difficulties in carrying out the survey. On visiting the site, I walked the site to decide where my three points of control would be located. I placed three Pegs with a PK nail on each. I aimed to create a triangle of control with no large angles, to ensure it would be more accurate. This was particulary relevant when measuring the sides of the triangle using a tape, as accuracy here would be harder to achieve.

EQUIPMENT LIST- Geomax Zoom80

- Leica Round Prism x1

- Tripod x2

- 30m Tape Measure

- 10m Tape Measure

- Hi Vist Jacket x1

- Safety boots x1

- Clipboard

- Pencil x2

- Field Sheets

- Plastic Shaft Hammer

- PK Survey Nail Box

- NA720 Level

- 4 metre Levelling Staff

- Geomax Detail Pole

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CONCLUSIONOverall, I was pleased with the outcome of my triangle traverse and with the data I had collected. I found the survey interesting as I was able to compare different methods of surveying and learn how accurate each method was.

During the survey, I learnt how it is important to take check shots, even if they are not a necessary part of the survey but I saw hoe they can be useful and often prevent a revisit to site, if any data was potentially incorrect.

I would put the misclosure of my traverse down to the method of survey and the difficulty of holding the tape in the correct place whilist measuring the distances. I felt that it was difficult to obtain an extremely high level of accuracy with a tape, but that it was good to know the method of survey should there be a time where I could use it.

If I was to do the survey again, I would try to find a way of fixing the tape better. I thought that extending it past the nail so that if the distnace between the two points was ten metres, then I could have an extra metre each side with the tape fixed in place. This way I could reduce inaccuracies of holding the tape on the point and also the danger of misjudging where the zero mark is on the end of the tape.

I was pleased with the end result and the final plan. I am satisfied with the traverse and will continue to use what I have learnt from conducting this task for my future work. I will also remember the uses of the other methods of survey, should I ever have a problem with a total station or if, for whatever reason it is my only available method of survey, that I could conduct a tape offset survey for soft detailing.

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