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Anonymous users2024-02-06Generally, the end point of the arc chord and the end pile position are determined on the ground first. Then take the endpoint as the center of the circle, draw an arc with a known radius, and the two arcs will intersect at a point, which is the center of the circle, so that the central pile position will be determined. Then, with the center pile as the center of the circle, an arc is drawn between the end piles with a known radius.
The required arc shape can be measured.
If the position of the central pile in the design is already known, just use the central pile as the center of the circle and use the given radius to draw an arc between the end piles. r=(b2+4h2) 8hr(radius); b (bow base); h (bow height) This formula is easy to put on an arc beam.
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Anonymous users2024-02-05The traditional methods of construction surveying of arc plane graphics can be summarized as direct line drawing method, geometric drawing method, coordinate system method, and theodolite measurement method, among which theodolite measurement method is commonly used in theodolite angle measurement method, tangent branch distance method and chord line support distance method. The direct pull line method is to fix the center of the circle pull radius, suitable for the situation that the arc radius is small, the radius of this project is large, and the three center of the circle are all outside the building, so the method can not be used for lofting. The geometric drawing method is used in the flat site of the site, and the site of this project is not flat in the early stage of foundation construction, and there is a local deepening and cushion cap brick tire mold, so this method cannot be used to loft out.
The coordinate system method is to re-establish the coordinate system at the appropriate position in the plan, calculate the coordinates of each positioning point, and use the coordinate system to pull the distance and graze sheep, this method still requires the terrain to be flat, so this project is still not used. Although the theodolite goniometric method in the theodolite measurement method can realize the measurement and positioning of this project, the measurement and positioning from the control point to the deep foundation pit can not control the distance, and the distance angle measurement work must be carried out many times, which is very cumbersome and can not meet the requirements of the construction period.
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Anonymous users2024-02-04r=(b2+4h2) 8hr(radius); b (bow base); h (bow height) to tell you this formula, you can put the arc beam is very easy, I am also a professional in building construction pay-off.
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Anonymous users2024-02-03Convert the arc to the chord height of each point, and connect the points to make the arc, and the denser the point, the closer it is to the arc.
In the construction and installation site, it is often encountered that the arc pay-off, such as the circular structure or decoration in the highway, railway, water conservancy, electric power, building construction, municipal garden engineering, etc., almost where there is a building construction, there is a need for arc pay-off. It can be said that how to achieve accurate arc fixed-point pay-off is what every field technician must face. The application of analogy method summarizes the more common three types of five arc pay-off methods, two of which are the ruler method to do the construction site arc pay-off is the first systematic summary and proposed, its advantage is that it is intuitive, simple and easy to operate, and the construction personnel with junior high school mathematics knowledge can check and restore the missing points at any time with the simplest ruler, so it is worth promoting and applying.
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Anonymous users2024-02-021. The oldest method: make a sample on the flat ground, draw the plane figure of the beam according to the length, width and arc radius of the beam of the drawing, cut out the paper pattern with hard paper, and then put it directly to the corresponding position of the construction site.
2. The most commonly used method: at the construction site, directly according to the length, width and arc radius of the beam of the drawing, after determining the center of the circle, use a wooden strip longer than the radius to nail two iron nails (the spacing is equal to the radius), one is fixed in the center of the circle, and one is used to draw the line.
3. Advanced methods, total station pay-off, total station are used by full-time surveyors, you can not understand, but surveyors must understand.
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Anonymous users2024-02-01Use the total station to find the center of the arc beam! It's okay to stake?!
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Anonymous users2024-01-31Indeed, a circle or an arc needs to have a center and a radius to be easy to find. But what if the center of the circle is missing? Using the bow height method (calculus), the surface layer of the Yizhou Municipal Square project has a radius of 200 meters, and the center of the circle is indoors, which cannot be determined.
You can only find two points on the arc and then calculate it, get a point, and then find another point in segments, gradually divide it, and combine it into an arc with tiny straight line segments.
Dear, I hope this answer can help you [smile].
Liang Huan's radio program, in fact, I don't like it, because it's always a spoof, some people, it really makes me feel very awkward, I don't like this radio form very much, so I'm more irritable with his radio program. <>
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