ugg schuhe Static crushing method used to open rel

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Static crushing method used to open relief slot by cutting wall

a. Xu thirty plant using 88 l / 3 static cracking agent, in the middle row of 3 holes each hole charge volume,[link widoczny dla zalogowanych], the upper and lower JJI ~ L Volume 1 charge per hole. In order to enhance the crushing effect, respectively, in the upper and lower two rows of holes in two adjacent holes to increase an empty hole, no charge, the actual fragmentation better. The shaft did not affect mine production in the premise, in September 1998 completed the treatment, the current status of the well bore is normal. In addition, the current law has been broken open by the static pressure relief groove cut coal mine shaft there Yokogawa auxiliary shaft, mine shaft of Luwa, Chensilou mine wells 7 wells Jane, they are in the mine do not stop the implementation of the case. Enterprises so as to save a lot of project costs. 5 Conclusion (1) mine production for the park drainage, subsidence caused by ground shaft fracture, the rehabilitation treatment is one of the best ways to cut relief in the wall in the opening slot, the release produced out of the vertical wall attached stress. (2) static fragmentation method using open cut wall of outer tank wall and the pressure relief bore no influence on the pipeline facilities, construction of safe and reliable. (3) breaking the law by static pressure relief tank wall does not require cutting open continuous construction, so do not stop in case of rupture of shaft repair governance a reality, its advanced technology, economic efficiency is very significant. [References [1] E straight book. Lu Lan ground subsidence control method when the rupture of wall [J] Northeast coal technology,[link widoczny dla zalogowanych], 1995 (6) (the transfer l6 page) Construction Technology 2001, Volume 2 A two-step anchor support shell construction. Initial support, the first of about 25mm with a thickness of the rock surface spray layer closure, arch spacing of 0.8m of the resin bolt installation; then install continuous steel shell support,[link widoczny dla zalogowanych], the use of stents as part of its gradual release of the flexible wall rock deformation can . After completing their initial support, according to a second rock deformation timely support, re-spray lOOmm about concrete, the steel shell support of the small span steel arch shell two-way all the coverage, creating a shell lining, as as a permanent support. 23.4 application results reinforced shell support with a considerable number of ordinary steel supports two-way short span steel arch hull, the jet shear layer suffered was significantly reduced tensile and compressive strength are fully utilized, and thus their ability to support than ordinary steel Net sprayed layer greatly enhanced. A shell support can be reduced to spray layer joints have certain properties to pressure, which both shotcrete and rock joint deformation, but also to provide greater support to the power of rock. Roadway observations show that the shell support to install a stable month after deformation, the total deformation is 8 ~ 20ram, were deformed in a reasonable range, that support good effect. Comparison of material costs per meter tunnel Annex. Seen from the table,[link widoczny dla zalogowanych], the use of shotcrete shell A 29U steel support than support costs per meter of roadway can save 555 yuan, about their ability to support savings, the second after re-spraying of concrete surrounded by public 3O%, the economy obvious benefits. Schedule cost per meter of roadway compared 3 Conclusion (1) roof for the composite roof, in the soft rock interface prone to separation phenomenon. Once generated anchoring outside the scope of separation caused by subsidence or collapse the roof, the bolt will be completely included in the sinking or collapse within; so simple beam theory and reinforcement by forming support design theory is difficult to ensure the reliability of support must be the basis of conventional bolting reinforcement measures taken. (2) high-strength bolts,, J, pore size cable and shell support roadway support is an effective means to meet the intense rock deformation, are too loose, by the dynamic pressure of the tunnel support requirements. They are the hardness and softness of the active support form, can better adapt to the characteristics of strata behaviors. (3) to complete drilling equipment, particularly eye roof drilling equipment. Otherwise, when asked the increased drilling, drilling costs, quality assurance is difficult to affect the support effect. (4) Bolt rock support can give full play to its carrying capacity, effectively control the surrounding rock deformation and destruction. Engineering practice shows that Bolt was better than supporting frame roof support,[link widoczny dla zalogowanych], greatly reducing the amount of roadway maintenance services during the period, eliminating the need for the working face advanced studio drift up and down process, helping improve the speed of face advance . About the Song Wensheng (1967). Male, 199o graduated from the Jiaozuo Mining Institute engineers are now set mine production car Yongmei Group Division has published technical papers (on the next page 25) [2] Long-dimensional chess special blasting [M Beijing: Metallurgical Industry Press】 993. 268 ~ 269. Aunt straight section l About the Book (1963 a), male. Associate Professor MA, since 1984 been engaged in research and teaching work, the Ministry of Coal Branch Zhu won the second prize an offer Anhui Science and Technology Progress Award 1 1 State Education Commission Science and Technology Progress Award Rotary. Published nearly 20 din
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