Method for performing shaft orientation survey by using optical plummet
A vertical collimator and shaft technology, which is applied in the field of vertical shaft directional measurement, can solve problems such as large swing and difficulty in stability, and achieve the effects of expanding the scope of use, reducing costs, and improving measurement accuracy and scope of application.
Active Publication Date: 2012-04-18
中铁市政环境建设有限公司
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However, the double vertical line method is affected by the wind and dripping water in the well, and it swings a lot and is not stable.
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[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] Take the diversion tunnel project of Yichang No. 2 Water Plant as an example. The water supply project of the No. 2 Water Plant in Xiaoting District, Yichang City takes water from Shanxichong Reservoir through a pressure tunnel. The total length of the pressure tunnel is 2525.43m, and the diameter of the section after the tunnel is formed is 1.7m. The tunnel is equipped with a secondary cast-in-place reinforced concrete lining of 200mm thick from the inside to the outside, and a primary reinforced concrete prefabricated block assembled lining of 150mm thick. Due to the long tunnel, three branch tunnels need to be set along the main tunnel. According to the location of the main tunnel, combined with the terrain and landform features, a branch tunnel is set at K0+891.909. The type of branch tunnel is a vertical shaft with a circular reinforced concrete structure....
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The invention relates to the field of tunnels, in particular to a method for performing shaft orientation survey by using an optical plummet. The method is characterized by comprising the following steps of: drawing a tunnel axis on two sides on a top surface of a shaft (1), allowing a total station (4) or a transit frame to aim at a tunnel axis far away from the total station or the transit frame, erecting an automatic level laser optical plummet (5) on a tunnel central axis, plumbing a bottom on a shaft bottom embedded steel sheet (7) and marking, after the optical plummet is rotated 90 degrees each time, marking the points plumbed at the shaft bottom, plumbing 5 points on two sides in the range near the wall respectively to obtain the tunnel axis; and replacing survey crew to obtain a regression line again, wherein the bisector of an acute angle which is formed between two regression lines is used as a tunnel excavation direction control line. The method has the advantages that: the using range of the optical plummet is widened, cost is reduced, the survey accuracy is improved and the application range is widened, and the method can be applied to shaft orientation of mines, and tunnels.
Description
[technical field] [0001] The invention relates to the field of tunnels, in particular to a method for vertical shaft orientation measurement using a plummet. [Background technique] [0002] Shaft orientation measurement is the measurement work that transmits the plane coordinates and directions in the ground coordinate system to the downhole through the shaft. According to the orientation method, it can be divided into one-well orientation and two-well orientation. A well orientation is a shaft orientation survey performed in one shaft. It is to hang two heavy hammer lines at the same time in a shaft shaft or emit two visible light beams vertically at the same time, and through the joint measurement of the ground and downhole, the plane coordinates of the center of the two heavy hammer lines or the axis of the beam and the coordinates of the connecting line Azimuth, passed to downhole control points and traverse edges. [0003] At present, the traditional methods of trans...
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IPC IPC(8): E21B47/022
Inventor 岳立章刘雪平邵保民马良王荣高
Owner 中铁市政环境建设有限公司