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Sir,i have some issues to ask about getting started for building layout such foundation and gridline offset,which method advisable and accurate to use in 300m x 108m building by coordinates method or angle/chaining method.thank you sir i realy need ur advise.thank u
This Content Originally Published by a land surveyor to Land Surveyors United Network
topcon ES 105 total station sir,
Your question is unclear but I hope to help. By coordinate method I am assuming you are referring to radial stake out? I prefer to perform a simple boundary(footprint) of building, holding a long side and double centering each turn. By "double centering", I am assured my gun is flopping within spec and can set my offset grid lines at the same time. Now keeping in mind, The form setters most likely will not be within my accepted accuracy which is why I prefer to set my own batterboard and string line.
Getting started is a control network, and there is no difference between a rectangular coordinate method and a polar coordinate method, however, this is a repeat of a previous post for which, perhaps, no agreeable answers were provided.
If fishing for answers with a net that has large holes does not catch a precise answer, try greater precision in the construction of your net.
That is, please furnish more, or maybe less, information.
I like to help people, but I have to understand the problem or question before I can do so.
looks like someone is taking a piss and some suckers are buying....
Thomas Putku <confused> Do you have something of value to add? Mr.Wilt helped by suggesting a control network put in place which could be as simple as a trans/rotation to found cors. How would you help the OP in his' quest for knowledge?
Aside from the routine instrument procedures, I think old-school is still the best way to go. No radial staking, except for one baseline, that's for sure.
Consider picking a long side of the building to stake, does not matter if actual building line or offset as long as you keep track of where you are and it is dead clear to those who will be using your points. That is your baseline, control line, whatever you want to call it. From then on, the only angle you should EVER turn on that job is a RIGHT angle.
Set your various main building grid points along that line per the plan, [email protected] for ex., label them same as the plan labels the lines, not your own personal stationing terminology. Those are the points you will be occupying to turn your strong 90 degree angles off that baseline each time to get those perpendicular grid lines. Hopefully the end of each of those perpendicular grid lines will be the face of an old exposed wall. So you can then have permanent markings and no stakes being ripped out on that side of the job. If your electronic measurements are to face of that wall, do the basic subtraction and write the offset to that particular building line each time at each of those +'s. The offsets may vary a few 0.01' if that old wall is not parallel to your baseline, that's OK. You should be able to chain along that face of wall to check the individual grid distances from + to + .
If you have no existing wall to place markings on, then that side of the project will be just as exposed to damage or removal as your baseline. Job superintendents are willing to help you protect your points; or they might make suggestions as to where they would like the offsets. They know their project will slow down otherwise.
Anyway, it always has worked for me and for the guys who got me started a long time ago.
Oh sorry. One more tidbit of course, once you have that baseline radial staked in, it goes without saying to make whatever checks you need to make to the perimeter of the project, other control or improvements until you are satisfied with that baseline.
I think me and Charlie both answered this ?" in the first post. Coordinates can be use in both methods.
Since coordinates is the key word, rectangular and polar are coordinates. Angles are used in both method and as I said coordinates can be used in both methods.
Chaining is the only difference,but he asked Angles/chaining/tape as a method. Is one to assume that coordinate method,what ever that is, is not being chained . I gave him the ? is this Radially or Right Angle and that coordinates can be used in each one he did not asked anything about GPS. Charlie gave him his input on using GPS. I told him no matter what you use, check your 90's and your diagonals and using a EDM was better than chaining. Chaining is a lost art in todays modern survey teams. Very few know how to do it correct . Only well seasons Surveyors could layout this building with a steel Tape( Chain) and plumb bobs.
Now lets go back to Coordinate Method. I have never use this term in this way. Coordinate method term refers to calculating Area and this is the only way I have seen it used. And I no nothing in my past as a reference to a Angle/ Chaining method. What angle, you wouldn't try to do this radially. So please someone show me a reference in a Text were these TWO are defined as terms in surveying where coordinate method has nothing to do with AREA and Angles and chaining is not Polar Coordinates or conventional traverse or Right Angle layout with a steel tape . Surveyors all over the world use different terms that in itself could be a discussion.
ok then, waht tolerances are you working and what is exactly the purpose of your excersise?
This is my ?. What is a Coordinate Method. I can only assume what a Angle /Chaining method is.
But lets move on. Like I said surveyors all over the world use different terms. So please tell me what a coordinate method is. Are you referring to use a onboard TS program using jobs file,entering coordinates, then use setting out to layout this building. Lets go back to terminology , "Setting Out" was and is used many other ways. Layout, Stakeout , Point Staking or Staking Points all mean the same thing as Setting Out. So is Coordinate method as you referring to using a Total Sta. by Setting out program with coordinates. Since I know of these programs long ago when they first used in the TS, I have never had to use them. I have always calculated my own Angles and distances and never spent time entering all this point data. Then Data collectors came along. I have always preferred to use a calculator or Data Coll.
I know TS data collection has come a long way, but I still prefer a Data Collector or just a calculator. Some TS setting out programs or point staking do not show the angle you are turning . Each point staked the angle reading is 0°-00"-00' , I like to see the angle that is being turned so I have never like this system. There are many who use this, I do not, but to each his own. Surveyors all over the world survey different. And Kudos to you for surveying a building this large. You will more and likely will find more errors in the plans than you make. I have never used this term Coordinate Method in this way,but again I do not survey all around the world. And young surveyors use different terminology than the older.