VIP free Foundation reinforcement for slope connection of municipal roads and bridges (adjustment of mixing pile range)
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Note 1. Unless otherwise specified, the dimensions in this drawing are in meters. 2、 Original ground treatment Excavate 0.3m thick arable soil from the surface, remove all obstacles above and below the ground, backfill to the original ground with soil, and compact it with compaction degree K ≥ 0.90 (heavy compaction standard). When the site is low, it shall be backfilled with cohesive soil instead of miscellaneous fill. 3、 The pile location plan and pile length arrangement of deep cement mixing piles are used to reinforce the foundation under the new motor vehicle road within 50m of the bridge head slope section of xx Bridge and within the range affected by the live load of the road surface. The distance between piles is 1.2m under the road surface and 1.4m under the influence of slope. The piles are arranged in quincunx shape with a diameter of 0.5m. Pile length arrangement: see the left table. 4、 Technical requirements for construction of soil cement mixing piles 1. Before the formal construction of soil cement mixing piles, pile forming process test shall be carried out, and the number of piles shall not be less than 2, so as to master the pile forming experience on the site and various necessary technical parameters. 2. Position the mixing pile according to the design requirements, and the error between the actual pile position and the design drawing shall not be greater than 5cm. 3. No. 425 ordinary Portland cement shall be used, and the cement content shall not be less than 45kg per linear meter of pile length. The water cement ratio shall be strictly controlled, which is 0.45~0.50. 4. A certain amount of admixture can be added into the cement through indoor test, and the amount of admixture can be carried out according to relevant specifications and standards. 5. According to the pile forming process test, strictly master the speed and times of the mixer's shotcreting lifting. There should be a special person to record the time of the mixer's sinking or lifting per meter. The depth recording error should not be more than 50 mm, and the time recording error should not be more than 5 seconds. 6. In the process of pile forming, continuous shotcreting shall be ensured and suspended for some reason. When resuming the slurry supply, the shotcreting construction shall be repeated by overlapping 0.5m at the broken surface. If the machine is shut down for more than three hours for some reason, the pipeline shall be disassembled for cleaning. ...... Drawings include: cross section of soil cement mixing pile, layout plan of soil cement mixing pile, reinforcement length table of soil cement mixing pile...... 1 sheet in total