CONSTRUCTION SURVEYING HIGH-RISE BUILDINGS

Today, in order to meet the demand for construction of a series of high-rise buildings across the country, surveying in general and surveying high-rise buildings, in particular, is considered an integral part of the modern construction. on a large scale. The layout of a relatively large structure such as tall buildings requires appropriate geodetic techniques to transfer the design drawings to the field. And to better understand the process as well as the importance of surveying high-rise buildings, we refer to the following content:

Axis rotation

Depending on the conditions of equipment, structure, and number of floors, the preferred method of moving cylinders is to minimize the cumulative error, the axis below the bottom of the foundation pit or the floors transferred from the accent on the 1st floor…

Assume that if you have to move the point A from the nail onto a certain floor T, then on axis A go to the point A1 in the direction of the theodolite; After concentrating and weighing machine to observe point A, fixed horizontal angle, angle of view lens to floor T marked A ‘; Reversing the same performance is the point A “. The middle point of A ‘and A’ is that the trailing A has been moved to the T.

Use a vertical projector located at point A on the first floor of the building. The vertical projection of the machine will radiate A on the floor of the tier. Accuracy Δh = 0.001875 × h + n. Where: h – height of one floor, n – a number of floors. To make this method need to let the holes through the floor, hole up the layout in the corner.

Move to the next level:

Using two leveling machines, the steel, and the steel to convey the height to the floor. The layout is as shown below:

HC = MA + a + (n2 – n1 ) – b

HC = MA + a + (n2 – n1) – b

Of which: MA – base elevation; a number reading on the mold at the mold M; n1, n2 – the number read on the steel plate corresponding to the gauge height of the leveling machine at the foundation and floor; b – number of readings on the floor at floor T. The accuracy of the method mh = 1.5 + 0.25 n (mm).

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Subdivisions of surveying:

Surveying and mapping: It is known that the topographical mapping is not only for civil purposes (cadastral work, construction planning, …) but also for the military as above East Sea…

Geodetic survey: is the survey of construction design before construction, during the construction and supervision of construction. Monitoring of displacement monitoring and prediction of deformation of works, foundations throughout the life of the project. The tool is mainly measured by the usual type of measuring machine: theodolite, water level, laser dash, electronic total, …

Photogrammetry: This is a field study of the mapping of airplanes, terrestrial imagery, satellite imagery, using imagery instead of traditional methods to build specialized maps. for land management. At the same time, the land surveyor will process the results of the survey.

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Higher geodesy: is a global scale measurement used to apply or solve global problems.

Mining geodesy: This sector has its own characteristics and is divided into two minor disciplines: mining geodesy – works and application of geo-informatics in researching and monitoring natural resources. To detect and conduct the prediction of the location of ore mines and minerals.

Remote Sensing: This is a subdivision of surveying from aerial photography (aircraft, …) after the flight, by ship (drawing continental shelf, ocean floor, …). Measurement tools can be cameras, ultrasound devices, radio radar, …

Satellite positioning (GPS): locating and geotagging (special remote sensing)

Geographic Information System (GIS): is specialized in software and geographic databases (information technology).

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