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1
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The quality of various pile raw materials shall meet the design and specification requirements; the admixture shall be suitable for the cement type
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2
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The length of precast pile shall meet the design requirements
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Generally, the method of connecting piles should not be used to meet the length requirements
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When it is necessary to connect piles, the welding method should be used instead of the slurry anchor method
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The number of joints at the same elevation of piles should not be more than 50% of the total number of piles, and should be staggered
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When the pile is difficult to sink, it should not be cut at will
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The position of the supporting points in the precast pile row pile wall shall be accurate and the supporting shall be timely
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C the precast pile row pile wall shall be closely and firmly connected with the crown beam and waist beam
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3
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The designed pile length must be ensured when the hole is formed
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The installation of reinforcement cage shall meet the direction requirements specified in the design, and the position of moment reinforcement shall be accurate
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There should be no broken pile and the length of embedded pile should meet the design requirements
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4
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Before the crown beam construction, the pile head of the supporting pile shall be chiseled and cleaned, and the length of the steel bar exposed from the pile top shall meet the design anchorage length requirements; during the waist beam construction, its position and the connection between the beam and the pile shall meet the design requirements
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5
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The straightness of the tooth groove can’t be checked by sight, sometimes it seems to be straight, but there will still be great resistance during the construction, and even the pile will be brought into the soil layer
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If a short sample pile is used to pull along the tooth mouth of the sheet pile for one time, if it can pass smoothly, there will be no big resistance during the construction in the future
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6
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The support structure in the water bearing stratum often causes groundwater leakage from the pit to the pit due to improper water stop measures, and a large number of soil particles are drained, resulting in the settlement of soil outside the pit and endangering the facilities outside the pit
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Therefore, there must be reliable water stop measures
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These measures include deep mixing pile curtain, high pressure jet grouting waterproof curtain, grouting curtain or dewatering well (point), etc., which are selected according to different conditions
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7
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The construction site shall be flat and compacted, and there shall be no settlement deformation endangering the construction safety during the construction
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