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Strengthening the foundation under the building practice of artificial


The strength of mud to play faster, such as initial setting time of cement 400, only 2O minutes, 12 hours, the compressive strength can be achieved 400ksf/cm. . Grouting of water-cement ratio of about 1:0.6 control, such as when the grouting holes drill holes or grouting abnormal flow too fast, change the Note l: l cement mortar grouting materials to ensure the timely supply of continuous injection pulp. 3. Slurry mixing: the use of artificial or mechanical stirring, into the hole by pressure injection pump, pay attention to adjust the slurry concentration, it is necessary to ensure a timely flow into the hole, but also be able to play quick-setting role. 4. Grouting pressure; control at 4 atmospheres, from weak to strong gradually, gradually pressurized, since the initial pressure grouting, ever injection pressure is too large, it's easy to run pulp. Middle atmospheric pressure is 0.4 ~ 1.3, the final injection pressure to expand the scope of grouting mixed, into the soil easily, the pressure of not less than four atmospheres, ensure grouting. Should pay attention to the upper structure in a pressurized crack with or without changes,[link widoczny dla zalogowanych], such as fracture deformation had stabilized, and no official pressure to stop the continued grouting, cracks to be stable after the injection, such as the surface appears to take slurry, immediately cease and injection pressure pulp. 5. Grouting sequence: first,[link widoczny dla zalogowanych], note the outer layer, and then note the inner, indoor Foreign Minister asked to pay attention. Note that the first outside of the transformer between the South and the Northeast outside, while injection room, and then note down outside the Northwest, and finally closed things outside. General outdoor than indoor two-hole lead, alternate construction, the support angle at the injection hole, control the weak parts. 6. Grouting distance: according to design requirements for the 1.2 ~ 2.0m, but in practice is continuously adjusted (based on the lateral wall of the lot length and crack encryption or relax). Note first before jumping Note 4m, and then gradually encryption, the final pitch to the impulse to prevent the passage of the principle of water. 7. Do i1 paste record, record the amount of each hole grouting, speed, hole depth, timely analysis of the quality and results. Drive room 163 grouting holes were arranged, plasma hole total footage i250m, the actual injection hole 163, hole plasma total footage u41.1Om, the average depth per hole grouting 7m. Third, the grouting project site layout and test the tension, when determining the grouting program, from preparation to open: [only 6 days, rotating workers must make arrangements on the one hand, posts and quota, division of labor, another On the one hand to do the construction site layout, ease of material supply, process and reasonable, then f operation and management,[link widoczny dla zalogowanych], this time we combine the actual layout of the construction site area as shown in Figure 3. Figure 3 Schematic layout of grouting grouting process quality inspection department to take any samples, the average sampling 1O a side wall, through observation and testing the strength and core samples to determine the grouting effect of molding conditions, such as the kind of core integrity of bulk cement Rui Rui rarely broken or scattered and fragmentary, or cushion-like core compressive strength and compressive strength are basically the same, then the grouting effect is good. 5O core samples through the test, and the slurry cushion the stones had been cemented in the l days of both the overall, average compressive strength of core samples reached 30 to 40 oysters f / ∞. Actually play a dual role of water pressure. Acceptance, in order to experience 'the reliability of land-based, but also outside the moisture away from 3m at the dug wells, dug to a 2.10 basis as the elevation at the bottom, the foundation is very strong, similar to rock. Fourteen, the treatment effect of a foundation grouting the end of May immediately after the construction of multiple fractures on both the rejection of epoxy and glue the patch cracks, and on the ground water and underground drainage system to re-divert flow. And time each week observing changes in the housing degree of tilt and settlement. In early July,[link widoczny dla zalogowanych], once again drive the engine room and subjected to heavy rains, the whole structure and foundation of the upper house had no new deformation, crack no development. Formal operation in 1986 driving machine about five years so far, producing normal,[link widoczny dla zalogowanych], proved effective. The grouting area (grouting range) to 839.28m, a total consumption of cement volume 412.9t, the average amount per square meter of cement grouting 0.492t, grouting invested 423,800 yuan, the average per square meter construction area of 957 yuan strengthening investment, although the unit cost is higher, but by the child to ensure that the full mine production on time for the state to restore the loss of 17.576 million yuan by the crowd, made great social and economic benefits. Fifth, the experience and lessons-driven artificial foundation grouting room building in the mine is the first time using this method for emergency rescue works with better performance, but also accumulated a lot of experience, but it should be clear that Serious lessons learned, the key is to strengthen the construction management, especially in multi-unit synchronization under construction, but also to fragmentation is responsible for overall planning and unified leadership of the command of the audience area of the drainage mitigation measures implemented to ensure the smooth. When the design of alternating layers of sand and gravel used in building construction of artificial foundations should also meet the education foundation trench around the intercept, and then distributed to divert efflux to avoid the instability of the incident ground, should really learn a lesson. One good l
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