Category: Verticality check using theodolite

Just set up total station in front of tank about equal distance to the height of tank. See through objective glass the top edge of tank structure and lower the telescope to the foot,if line of sight goes away from structure measure putting a steel foot or tape and find the deviation from plumb. If line of sight goes towards the structure then sight the edge at the bottom and take it to the top and move the line to the edge at top then bring line of sight again downward and measure.

This will show the difference from plumb. With those SW you may analyze the 3D data and prepare a report. About the survey with a total station I agree with Tom Ameson you can also measure a lot of vertical sections that you highlighted before on the tank's surface and analyze the data with the SW listed above.

You can verify the verticality and also the squareness. That is a tough question. You could use a laser scanner instead to scan the tank and check the vertically. The total station would be used to set the control points for the scanner and the spheres. I hope this helps. The simplest reference for verticality is also the easiest to convey to a client - a plumb bob in windless conditions. If too windy to protect, then a plumbed range pole.

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Land Surveyor Arif Mahmood June 28, at pm. Land Surveyor Timothy Watato June 28, at am. Hope this helps. Seeking Employment Maurice Heter June 27, at pm. Amr Hussien June 27, at pm. You can make 4points around the tank and take readings with reflector less and you make the points around tank is your station and then check on autocad 3d or 2nd and check how many difference.

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Check vertical alignment of a tower

Include the plumb bob in your scan and you have the perfect reference for comparison. All other "control" methods have at least 2 dependencies vs. This reply was deleted. Note: this page contains paid content. Please, subscribe to get an access. Cancel Subscribe. Stevens and Associates, Inc.How do you check for the verticality of a tower? There is no vertical line in the structure since the components are angled up to the top. The tip of the tower from where I am standing sems to be not at the center.

This is only an observation becaise there are a lot of antenae at the top. For a building you can observe the edges while moving the telescope in a vertical motion keeping horizontal movement locked on the total station.

Tower I am observing is a TV ,Radio transmission tower made from metal girders and not solid concrete. If you know the different diameters at the top and bottom you could calculate the design offset versus the actual offset. Ie if the tower is 3. Maybe measure the top and bottom on all four sides? The top four points should be centered within the bottom four points.

We had a small job where we had to ensure some tapered mobile phone towers got installed exactly vertical. It would have been easy except the towers were cast concrete in two parts and because the join between the upper and lower section was so rough, the towers were actually slightly kinked!

We did the best we could and the client ended up happy thankfully. Is this a 'lattice tower', square in plan with four legs tapering up to a 'shoulder'? Usually above the shoulder there's a bolted on pyramid with a lightning rod, and as you suggest, near but not on the centre. If you can't climb the tower and place a centre mark up at shoulder level you will have to measure the horizontal component of the taper preferably on all four legs. I used to do this regularly on towers, stacks and chimneys.

If the taper is the same for all four legs then the tower is vertical. The method I use is to lay a levelling staff horizontal at base level, set up a 5" theodolite well back from the tower so that sighting up to the top is comfortable. Sight top and bottom and rotate down to the staff and record the readings, averaging face left and face right is best. You could do two set ups at 90 degrees to each other and aligned with the tower faces or, four set ups at 45 degrees to the tower faces, ie at right angles to the tower diagonals.

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All depends how many obstructions there are to seeing the structure. Make sure you get the exact same points every time, it's easy to confuse the main structure with brackets, plates etc, especially against a bright sky. A typical UK lattice tower, it tapers then the upper part is vertical.

This photo was taken about three years ago, there's even more stuff on it now! Artie, Yes that is the type of tower I need to measure. There are so many attached components that you don't know where the center actually is.

verticality check using theodolite

I will try to understand your method that you suggested.To check a tower vertically by using a theodolite, you must first check for collimation and check the vertical axis of the theodolite. If all is okay, then set up your theodolite a bit away from the tower and clamp the horizontal plate, then check the tower zenith transit. To check vertical deviation of tower using theodolite, measure the distance between the target and the point of burst in the plane.

There must be a normal line of position along a line perpendicular to the lateral deviation. A theodolite measures angles and axis needed for site surveying. The horizontal and vertical angles are measured using a theodolite. A theodolite is actually a mounted telescope used in building. A theodolite is an instrument that is used in archaeoastronomy. To change the face for taking angle measurements when using a theodolite you must turn the telescope by degrees.

Face left and face right are taken to reset the posoition of the theodolite so additional measurements can be raken. Setting up the Theodolite: This includes mounting the theodolite on a tripod and making sure it is comfortable for the user. Unlock the upper horizontal clamp. Rotate the theodolite until the arrow in the upper or lower rough sight points to the feature of interest and lock the clamp.

HOW TO CHECK VERTICALITY OF BUILDING DURING CONSTRUCTION - IT'S METHODS TO CHECK

Look through the main eyepiece and use the upper horizontal adjuster to align the vertical lines on the feature of interest. The reading is taken by looking through the small eyepiece.

Using the minutes and seconds adjuster set the one of the degrees on the horizontal scale so the single vertical line on the bottom scale is between the double vertical lines under the selected degree. The reading is the degree which has been aligned and the minutes and seconds read from the right hand scale and is the horizontal angle from the reference line.

Unlock the vertical clamp and tilt the eyepiece until the point of interest is aligned on the horizontal lines. Lock the clamp in place. Looking through the small eyepiece, use the minutes and seconds adjuster to align one of the degrees on the vertical scale with the double lines just below it.

The reading is the degree that has been aligned and the minutes and seconds is read from the right hand scale. To complete the reading, it may be necessary to measure the distance from the theodolite to the point of interest.

The above is al true, but doesn't discuss the practical uses of a theodolite. For example, if you want to know the height of the top of the gable on a house, you could use a theodolite.

verticality check using theodolite

First, set up the theodolite btw, I made one with a piece of copper tube, a protractor and a cheap wooden tripod as noted above, make sure the ground is pretty level between the house and the theodolite, and then measure the distance from the vertical side of the house to the theodolite.

You may choose to move the theodolite so that the distance is the square of a whole number. Then aim the scope tube at the upper-most point of the gable and note the degree of angle on the protractor. If you have pretty level ground between the theodolite and the house, the angle at the intersection of the side of the house and the ground should be 90 degrees.

So, now we have two angles the 90 degrees at the intersection of the side of the house and the ground, and whatever angle you recorded at the theodolite and a side the distance from the house to the theodolite. With this information, you can calculate the third angle and the other two sides, one of which will be the hypotenuse and the other will be -- tada!

Maverick buzzed the control tower after the exercise was over. Using the HP tower that is specific for your HP model would be best.Checking verticality works would encounter during building construction at several stages such as during installing vertical formworks of columns and transferring levels up successive floors of multi-storey structures.

Various methods which to control or check verticality works during building construction are discussed. It is an instrument that sight directly down or directly up. Optical plummet has an automatic compensator which increases its accuracy significantly compare with other methods used for controlling verticality. Up next. Author Engineering Discoveries.

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Various methods which to control or check verticality works during building construction are discussed Methods used to check or control verticality works include 1- Plumb-bob technique. The heavyweight will suspend under gravity and provide a perfectly vertical line that is known as a plumb line.

This process is useful for examining or managing vertical line of structural elements specifically indoors like lift shaft.

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With addition to that, it gets the ability to manage verticality of foundation, walls, and columns. Small to medium lateral movement of plumb-bob can be decreased favourably by moistening it in oil or water. This tool is very suitable for managing verticality of small scale works as for instance verifying formworks and door frames.

If spirit level is applied for approximate checks, then it becomes essential to examine the verticality with more precise technique. Theodolite is a considerably robust instrument that can be utilized to verify the verticality works throughout construction by maintaining exactness and correctness.

It is undertaken for examining or managing verticality of towers, wall, foundation and columns; a specifically huge number of columns along a one grid line. The slope out of the plumb line of the member can be calculated with Theodolite in conjunction with a tape.

With two readings at the equivalent level, it will be possible to recognize any curvature on the surface.Forums New posts Search forums. What's new New posts New profile posts Latest activity. About Us. Log in. What's new.

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JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. How to check verticality and deviation of monopole tower using Theodolite. Hein Htet Aung Newbie. Hi AllHow can I check vertical and deviation in this monopole tower using Theodolite?

Please kindly suggest to me. First set yours instrument in front of monopole tower almost 25Mthen draw same 25M long line which is parallel to yours instrument at both side of tower. Horizontal and vertical height can be measured using theodolite.

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Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Hi everyone. However, I am tasked to check verticality erection deviations of steel columns with splice connections.

The structure is a cement plant tension tower appr. Pease see picture below. Code of practice Eurocode says to check deviations at one storey in relation to storey below or deviations at one storey in relation to column base. Any idea how to approach it and what limit to use?

verticality check using theodolite

Or maybe completely change the approach? How do I allow for manufacturing imperfections? I will use theodolite to check deviations. I was also advised to get coordinates of the column at the bottom and at the splice and then get the difference. But how will I convert it to millimetres??

Thank you!! I have performed many "vertical column plumb surveys".Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. VIP members get additional benefits.

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By registering, you agree to the Terms of Service and Privacy Policy. Lost your password? Please enter your email address. You will receive a link and will create a new password via email. Sorry, you do not have permission to ask a question, You must login to ask question. Become VIP Member. Do you need to remove the ads? Checking verticality works would encounter during building construction at several stages such as during installing vertical formworks of columns and transferring levels up successive floors of multi storey structures.

Various methods which to control or check verticality works during building construction are discussed. Plumb-bob as shown in Figure 2 consist of a weight with pointed tip on the bottom attached to end of a string.

The heavy weight will hang under gravity and offer a precise vertical line which is called plumb line.

How Verticality Of Structure Is Checked During Construction

This method is applied for checking or controlling vertical line of structural elements especially indoors such as lift shaft. Added to that, it is used to control verticality of foundation, walls, and columns. The plumb line or vertical line of plumb-bob is influenced by wind force and it will lose its accuracy and precision.

Small to moderate lateral movement of plumb-bob can be reduced satisfactorily by damping it in oil or water. If the height of structural member is large, then it is possible to replace the string with a long wire, but substantial cautions should be plasticized so as to avoid imposing risks to the personals working below.

This tool is appropriate for controlling verticality of small scale works for example checking formworks and door frames. If spirit level is employed for approximate checks, then it is required to check the verticality with more accurate technique. Theodolite is substantially powerful instrument which can be used to check verticality works during construction with great precision and accuracy.

It is suitable for checking or controlling verticality of towers as shown in Figure 8, wall, foundation and columns as shown in Figure 9; specifically large number of columns along a one grid line. It is possible to measure the slope of out of plumb line of the member by using Theodolite in combination with a tape.

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It is an instrument that sight directly down or directly up. Optical plummet has an automatic compensator which increases its accuracy significantly compare with other methods used for controlling verticality.

Sign Up Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Have an account? Sign In Now. Free Signup or Login to continue Reading Remember Me! Don't have account, Sign Up Here. Forgot Password Lost your password? VIP Dashboard. Plumb-Bob Technique 2. Spirit Level Method 3.

Theodolite Method 4. Optical Plummet Method. Previous article.