A Construction Method of New Triangular Height Measurement in Large Area Deep Foundation Pit

Abstract

The invention relates to a construction method for new triangular elevation measurement in large-area deep foundation pits; it includes the following steps: writing a construction control measurement plan; reviewing known elevation points; selecting the location of control points in the field area, and laying control piles; establishing the field District elevation control network; according to the construction unit providing at least one known elevation control point Z1, according to the number of project units, two points A1 and A2 are arranged on the foundation pit, and one point KD1 is arranged on the bottom of the foundation pit; the total station is set up at At any position between the two points Z1 and A1, two prisms are erected on the two points, respectively record the elevation Hz1 of the known point and the elevation Ha1 of the control point; then record the elevation data Ha1', Ha2; aim at the KD1 point at the bottom of the foundation pit, The total station automatically reads the data to obtain Hd1 and Hd2; compares whether the data of Hd1 and Hd2 are equal, and completes the data review; measures the elevation of the pit bottom control point at a firm and reliable position, and draws a prominent mark for protection.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a construction method for new triangular elevation measurement in a large-area deep foundation pit. Background technique [0002] Elevation measurement is the measurement work to determine the elevation of the ground point. The elevation can be calculated by measuring instruments such as level, theodolite, and GNSS satellites. When measuring the elevation of the super-large area deep foundation pit, it is known that the elevation control point is far away from the building, the project plane area is large, and the measurement accuracy is required to be high. Accuracy class. [0003] For the elevation measurement of large-area deep foundation pits, two factors are mainly considered in the construction measurement stage: the horizontal distance D and the vertical angle ɑ. When the vertical angle ɑ is between 1° and 25°, and D=100 meters, the error in the...

AI Technical Summary

Problems solved by technology

Using this construction method can effectively control the accuracy and efficiency of foundation pit height measurement. By controlling the horizontal distance D and the vertical angle α value in the measurement process, the measurement accuracy can be ensured, and the super-large-area deep foundation pit height measurement can solve the problem of traditional leveling. Difficulties such as measurement operational limitations and precision instability

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