- 1 What is a linker Rod?
- 2 How do you read survey elevations?
- 3 How do you read a Philadelphia rod?
- 4 What is RL in surveying?
- 5 How do you establish an elevation?
- 6 What is Rod level?
- 7 How do you shoot a grade?
- 8 How do you read tenths?
- 9 How do you use laser grading?
- 10 How is transit grade calculated?
- 11 How do you calculate land grade?
Direct Reading, or True Elevation (also known as Lenker style) is a Grade Rod with a moveable tape face allowing you to set the actual benchmark elevation, or any elevation, above or below the bench into the rod. … Since no math is involved, grade shots are much faster than conventional style rods.
How do you read survey elevations?
To find an elevation, simply set the rod foot at any location on the job within the range of your laser or optical instrument. Run the detector and / or front rod section up or down until you pick up the “on grade” signal from your detector. Read the number opposite the pointer. That number is your true elevation.
How do you read a Philadelphia rod?
Each foot on the Philly rod is divided into hundredths of a foot. The distance between the hundredths is painted black on a white background. The bottom of the black mark is odd values, and the top of the black mark is even values. The rod must be placed on the correct point exactly and held plumb throughout.
What is RL in surveying?
From Wikipedia, the free encyclopedia. Relative level in surveying refers to equating elevations of survey points with reference to a common assumed datum. It is a vertical distance between survey point and adopted datum plane.
How do you establish an elevation?
An easy-to-remember equation for finding change in elevation as a decimal is “rise over run,” meaning the rise (the change in vertical distance) divided by the run (the change in horizontal distance). As an example, let’s say the rise is 2 and the run is 6. So, you’d take 2 over 6 (or 2/6) to get .
What is Rod level?
: a graduated rod used in measuring the vertical distance between a point on the ground and the line of sight of a surveyor’s level.
How do you shoot a grade?
As important as it is, shooting grade is simple.
- Set up the tripod of the laser level or transit; spread the three legs, each an equal distance from the other two. …
- Position you partner within the building site or in the pipe trench. …
- Set the grade rod at different locations on the site.
How do you read tenths?
Convert your inches to tenths, keeping in mind that a tenth is one tenth of a foot, which is 12 inches—a tenth, therefore, is 12/10 or 1.2 inches. If you measure your water heater’s circumference as 144 inches, for example, you can convert it to tenths as follows: 144/1.2 = 120 tenths.
How do you use laser grading?
How to Set Grade with a Laser Level
- Set up the laser level on a tripod on firm dry ground. …
- Turn on the laser level and give it a moment to self-level.
- Identify the initial height of your grade. …
- Place the bottom of the leveling rod at the desired height.
- Adjust the laser detector up or down until you hear a beep.
How is transit grade calculated?
How to Use a Transit Level for Grading
- Set up the transit level. The device is affixed to a solid three-legged or four-legged base. …
- Hold a marked stick at a reference point for the grading project. …
- Move the stick to the first point in the project and repeat the process. …
- Compare a series of measurements to establish a grade or slope for a road or sidewalk.
How do you calculate land grade?
In other words, the number of feet the land rises or falls over a horizontal distance. Slope is often described in terms of percent. For example, an area that rises 12 feet over a distance of 100 feet has a 12% slope. Similarly, an area that falls 10 feet over a 30 feet distance has a 33% slope.