Line drawing method for construction excavation contour line of three-centred circular arch roadway
A contour line and three-center circle technology, applied in the field of roadway construction, can solve the problems of high labor intensity, heavy workload of excavation contour lines, and poor quality of excavation molding, so as to improve the efficiency of line drawing and ensure excavation Molding quality and effect of reduced workload
Active Publication Date: 2015-12-23
CHONGQING JUNENG CONSTR GRP +1
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Problems solved by technology
[0005] 1) Due to too much data, the workload of drawing the excavation outline of the three-center circular arch roadway on the construction site is heavy, time-consuming and laborious, and the labor intensity of the staff is extremely high, and the efficiency is low
[0006] 2) The arch portion of the traditional drawing method can only be located by drawing points. Since the points are connected by line segments, the drawn line is not a continuous line segment. The roadway outline drawn on site has a large error with the design. The quality of the excavation is poor, and it is easy to cause over- and under-excavation phenomena
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[0025] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0026] Such as figure 1 As shown, the essence of a three-centered circular arch is an approximate semi-ellipse, so the definition of an ellipse can be used to draw a three-centered circular arch. The mathematical definition of an ellipse is "the sum of the distances from a moving point to two fixed points is a constant", the trajectory of this moving point is an ellipse, and the two fixed points are the two foci of the ellipse; according to the above definition, as long as you know The distance between this "constant" and two "fixed points" can determine the size and shape of the ellipse.
[0027] As we all know, an ellipse has a semi-major axis, a semi-minor axis, and two foci. To determine an ellipse, you only need to know the semi-major axis and semi-minor axis of the ellipse or know the focal length of the two foci and the sum of the distances from the m...
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The invention discloses a marking method for a three-centred arch roadway excavation contour line. The marking method comprises the following steps of calculating the distance between two focuses of an ellipse, manufacturing a marking tool, calibrating a springing line, aligning the springing line and measuring a centre line point by using the marking tool, marking by using a cotton rope, and the like. According to the marking method for the three-centred arch roadway excavation contour line disclosed by the invention, data used by marking can be greatly reduced, only four data are required by full-section dimension control by using the marking tool, the marking becomes very simple and fast, and the amount of work is reduced by tens of times, and therefore, not only is the labor strength of workers reduced but also the marking work efficiency is effectively improved. The three-centred arch roadway excavation contour line marked by the marking method disclosed by the invention is accurate in positioning. The contour line is a continuous smooth curve, errors in design (hand drawing) are very small, and the marking accuracy is effectively improved, and thus, the excavation forming quality of the arch of a three-centred arch roadway can be ensured, and the phenomena of overexcavation and under-excavation are avoided occurring.
Description
technical field [0001] The invention belongs to the technical field of roadway construction, and specifically relates to a line drawing method for defining and simplifying the excavation contour line of an arch part of a three-center circular arch roadway by using an ellipse. Background technique [0002] The commonly used cross-section forms of shaft and roadway engineering include straight wall semi-circular arch, straight wall three-center circular arch, trapezoid, curved wall and curved arch section, etc. The straight wall semi-circular arch section is often used in main roadways with relatively weak surrounding rock conditions; Round arches are used in main roadways with relatively good surrounding rock conditions; trapezoidal sections are often used in mining area roadways; curved wall arches are often used in main roadways with poor surrounding rock conditions. [0003] During the construction of all roadways, the location of the roadway excavation outline is based on...
Claims
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IPC IPC(8): E21D11/00E21D9/00
Inventor 张钢
Owner CHONGQING JUNENG CONSTR GRP