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New three-heart arch design


gtifle $) k = InputBox (msg2j}, msgtitle $) ho = B/k0 [= 2atn (2 / k) r = (hn + b'2 / 4-2 {hO {r1) / (B-2} r1 ) PrintTab (6); 1O period of the arch will be able to get accurate parameter values. Calculated using three parameters arch heart procedures in Table 2 were checking the parameters, the results shown in Table 4. In italics in Table 4 and Table 2 corresponding to the formula and common parameters (constants) have a more significant differences. Table 4 New approximation E, 6 arch arch geometry parameters in Table 3 to draw fast and accurate three-heart arch above procedure to calculate the relevant parameters, you can quickly and accurately make three hearts arch tunnel arch graphic . Shown in Figure 1, three hearts arch tunnel arch graphic approach as follows: 1) the first arch to make roadway centerline 1 and baseline 2,true religion outlet, 1 and 2 at point D. Then from D to take the amount left and right, respectively, B / 2 have point A and point C. The amount taken up from the D h point was point F. From point A to the right amount of r too small arc center 0, the amount taken from point C to the left was another small arc center r 0:. 2) from D DO have to point down the amount of O,ed hardy uk, O is a big arc center point. 3) to 0 for the center to R is the radius, central angle to make a big arc; respectively, O and O of a circle, radius r, making central angle of the mouth of two small arc. Using AUTOCAD for three heart arch arch then you just need to make the right half (or left arch), with the Right half of the arch of the fast approach is as follows: first, to make roadway centerline 1 and baseline 2, 1 and 2 arch at point D. Volume were down from D to take the right amount of DO and DO for a large arc center point O and a small arc center 0. According to the known parameters can quickly make the right half of the arch. ※ information information infrastructure information ※, 8 we can see from the drawing process, the mapping method to remember. 4 Conclusion using the new three-heart arch arch parameters formula and the new method of calculation so that the three heart arch arch parameters results more accurate. Since most coal mines (especially the large number of small coal mines) there is no calculation of three-heart arch parameters and draw the three-heart arch graphics software, so quickly and accurately calculate the three-heart arc arch arched roadway geometry parameters and quickly and accurately draw the three-heart graphic arc arch arched tunnel still has its practical significance. First establish a precise calculation of three-heart arch arch parameters of mathematical formulas, and then write accurate calculation of three-heart arch arch parameters of the program, you can quickly and accurately calculate the three-heart arc arch arched roadway geometry, but also You can quickly and accurately draw the three-heart arch arch graphic. References: [1] Zhang Rongli. Mining Engineering Handbook [M]. Beijing: Coal Industry Press,MBTシューズ 販売店, 2o05. (Editor Pan Kai-) Jin and Lu Jixiang overall strengthening of energy cooperation, s the afternoon of September 16 seats, respectively, Shanxi and Shandong, Hebei and Hunan provinces to sign an intergovernmental framework agreement on economic cooperation in the field of strategic, overall strengthening of the coal between the provinces of Shanxi and energy exchanges and cooperation. Shanxi and Shandong provinces cooperation framework agreement: to encourage projects to develop power, coal for the power transmission system to promote change, and strengthening cooperation and the establishment of provinces, coal production and sales of long-term stable cooperative relations, and actively promote the coal base and power grid construction ; provinces to speed up cooperation and development suited to the requirements of an integrated transport network; to strengthen the backbone enterprises in the provinces, especially the mining equipment manufacturing, engineering, textile machinery and electrical integration of technical cooperation and personnel exchange, participate in a variety of ways to support mining and other areas in the restructuring. Shanxi and Hebei Province Cooperation in the energy, industry and investment,knock off oakleys, tourism, modern agriculture and other fields. Agreement include: to actively promote the coal, electric power companies long-term stable cooperative relations, to encourage coal power projects to develop and promote the two provinces in coal, electricity and petrochemicals, coal bed methane and other aspects of production and marketing cooperative, complementary advantages; key support coal chemical enterprises in the provinces, steel, equipment manufacturing and other fields. Cooperation agreement with Shanxi Province, Hunan Province, the main contents are: the establishment of coal, electricity sector long-term stable cooperative mechanism to speed up secondary energy output, and actively promote the construction of UHV power transmission project; strengthen bilateral cooperation in coal equipment, heavy equipment, coal chemicals, high voltage power transmission equipment, electromechanical integration,Salvatore Ferragamo outlet, and high-tech cooperation, to encourage provinces to establish a common research platform related businesses, co-development of domestic and foreign markets. [Lang Yajuan] 14
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