Perforated cast-in-place pile is a pile foundation of reinforced cage and underwater concrete poured by special drill into deeper holes, surrounded by reinforced concrete as a wall. It IS a DEEP FOUNDATION TYPE, suitable for high water table or silt geology, especially across rivers and other places, mainly under friction. The following is the preparation work plan of punching pile construction for Shanghai strong foundation
1Equipment preparation: pile machine wear parts, wire rope, alloy teeth, crane pulley, mud pool setting;
2Connection of impact system:
(1) Steering ring and hammerhead connection: Prepare the connecting ring (diameter50Mm round steel, ca110～120Centimeter-made) is worn on the lower end of the steering ring, and then the two feet of the connecting ring are welded firmly with the hammer head. The length of the weld is not less than30Cm.
(2) hoist and hammer connection: the main pull one end of the wire rope is fixed on the hoist, the other end through the pulley, the top pulley, and the upper end of the steering ring is connected, in order to increase the force radius of the wire rope in the bending part, prolong the service life of the wire rope, in the bending part of the wire rope installed special groove shaped iron. The first buckle of the consolidated wire rope should not be screwed too tightly to avoid injury and break of the wire rope here after being stressed. In general use3The distance between the buckles should be no less than6Double the diameter of the wire rope.
3Buried protective cylinder:
(1) The mouth of the cylinder must be at least above ground level50Centimeter above, in order to keep the water level in the hole higher than the water level outside the hole or the ground, so that the water pressure in the hole increases, conducive to protect the hole wall from collapse.
(2) Backfilling: Fill cohesive soil around the sheath to make the layers dense, prevent the penetration of surface water, and keep the sheath fixed.
(3) Prepare wall protection material: if the surface is soft soil, add flake stone, gravel and loess to the protective cylinder, the proportion of which is roughly3:1:1. Such as the ground for gravel pebbles, in the protective cylinder only add small stones (small particles of gravel) and loess, the proportion is roughly1:1.
4, the preparation and use of wall protection mud
The surface is all backfilled soil, containing more cohesive soil, the principle is the original soil for pulping, and according to the test pile situation, the reserve part of loess (clay soil) is considered for pulping. In the absence of the above properties of clay, clay with slightly worse properties can be used and incorporated30%The plastic index is greater than25The clay of the.
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