Karst collapse prevention foundation grouting tec

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Karst collapse prevention foundation grouting technology

~ 0,7:1 slurry of about 2t, then pull out the drill pipe, filling in fine sand, sand cement added 15 as the viscous agent. I Section 2 were injected into sand cave 10t, cement and construction MINE DESIGN 7544 Vol.33 No. 3 t; Ⅱ section of a cave into the sand about 45t, cement 189t. Ⅲ of a cave into the cement lt, construction of a total renovation of this 3 Karst Cave, which I drilled L14 a paragraph. Into the cement 217t. Sand 10t, 5t {Ⅱ sodium silicate drilling Ll6 a paragraph, into the cement 301t, sand 45t, water glass 7t; Ⅱ】 L1 segment were drilled, injected cement 145t, water glass 2.5t. L41 play a total of three sections, namely, extended 589.7 m, outlay of 425 ordinary Portland cement 663t, sand 55t, water glass l2.5t, quality inspection L9 months, into extended 130.3 In, sealed with cement L 2t. 5 5.1 grouting quality control and quality control checks by the following main quality control of foot work to ensure that the regulation effects; (1) foot of pre-construction workers who are learning organizations, and technical tests; (2) the implementation of work organization and management of foot The key to specify the high level of technology professionals, technicians and other staff for duty; (3) Based on available geophysical, drilling, grouting specification foot work; (4) well before grouting materials, size ratio test to select the appropriate technical parameters; (5) grouting works are special foot foot work, shift change to do on site face to face handover in order to maintain the continuity of the foot work; (6) prepare geophysical exploration, drilling, grouting abnormal parts of the detailed records and complete technical data tables foot work. 5.2 Quality Inspection in accordance with relevant requirements of grouting, grouting after 28 days, respectively, playing in each paragraph dealing with inspection holes 3, L depth of foundation rock the following 5In, according to drilling revealed that their characteristics are as follows: after grouting , overburden drilling easier, not the core problems such as grouting the phenomenon before. Remove the soil from the point of view. The length of the king in one strong body of cement, indicating that the basic slurry Compilation r soil filling the gaps in; surface soil cement strong body of sports vein, repeated soil part of the proof is split, split along the crack spread slurry rock surface and surface-based drilling watertight contact zone, coring and found a large number of strong cement, and some rock for the core half of the body half of the cement, rock and cement bond firm. Show that the contact zone has been filled, and well cemented. 2L, respectively, have penetrated the I, I section of the cave, drilling, back water, caves mostly within the core of sand and cement bond such as cave fillings, but because of the low cement content, so low intensity, lever can be broken. Cave mud further dense consolidation. To sum up, on a shallow overburden remediation Karst Cave, the feasible method is supplemented by the survey report is based on radar detection, to drill L sand filling, pouring cement slurry, cement slurry of a silicate double solution as the comprehensive management tools, it is not only technically feasible and economically reasonable, and the construction is simple, do not pollute the groundwater and surrounding environment and also have positive ecological improvement, therefore, have some social benefits, is a good effective methods. References [1] Chen happiness. Tongling street over a large area such as land subsidence control project completion report ER]. Changsha Changsha Institute of Mining Research. 1993. Ez] Dujia Hong, et al. Grouting underground construction manual EM]. Beijing: Social Science from j short. 1992 [3] Ground Handling Manual will be compiled stack. Ground Handling Manual [M] Beijing: China Building Industry Press. 1988. [4] Wei Han Tao, et al. 91 National Water Symposium Proceedings grouting Zhu [CS Guangzhou: 1991. (Continued from page 40) other constructors and strengthening measures; buried eight-foot steel column embedded part of the type set of studs, steel columns set in a strong position based on the surface of the stiffener to withstand the pressure of concrete came black, steel column column foot steel floor plate by calculation, in order to avoid column stress concentration soles of the feet were crushed under the concrete. 4 Conclusion damage that non-embedded the foot, especially in the ground with two non-buried I column base is easy to produce damage. Therefore, there are requirements for seismic resistance of the structure, should give priority to using embedded column base, if in the basement of a large range of stiffness, and reliable measures, they can be considered one type of non-embedded column base. References: [1] Chen Fusheng kitchen; country Hua, Fan heavy steel high-rise building design M]. Beijing: China Building Industry Press, 2000 [. ] GB] 7-89, building foundation design [s]. [Women YB90B2 ~ 97 reinforced concrete structural design procedures ravioli Is3. [4] GB 』10-89, Design of Concrete Structures Is] [5] Cai Yiyan steel reinforced concrete structure dig node design ¨ j]. Building structure. 2000. (】). (2).
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