Source: steel pipe lifting Secondly, ensure the flatness of lifting equipment and the verticality of guiding frame (vertical deviation shall not be more than 1.5%; piling deviation shall not be more than somm).
Originally from: Quality problems and reasons frequently occurring in the construction of deep mixing piles
In the manufacture of molds, attention must be paid to ensure the parallelism between the end face of the tensile concave mold and the bottom of the lower base plate (parallelism is required to be 0.012mm), and the perpendicularity between the edge bus of the discharge concave mold and the lower base plate (perpendicularity is required to be 0.025mm), and the perpendicularity between the edge of the discharge convex mold and the upper template (perpendicularity is required to be 0.025mm), and the verticality between the edge of the discharge convex mold and the upper template (verticality is required to be 0.025mm). The perpendicularity between the edge of the dropout convex mold and the upper template is 0.025mm, the parallelism between the dropout convex mold and the upper template is 0.02mm, and the rounded corners of the concave mold must be even and rounded.
Sourced from: micro-motor shell stretch forming process In order to ensure the verticality of the hole and improve the force conditions of the drill pipe, the drilling pressure should not be greater than 80% of the weight of the drilling tool in the medium (mud or water), nor less than 5 percent, otherwise the efficiency is too low.
Source: large diameter bored pile construction technology
Tests have confirmed that one of the keys to blanketing small holes is the verticality of the hole; if the verticality is greater than 0.02 millimeters, it is difficult to ensure that the hole reaming gb tolerance.
Source: small hole boring and reaming process research in a variety of piles require large diameter bored piles into the hole verticality deviation of less than 1%, otherwise drilling base, large diameter bored piles are bridges, tortoise factory and other important piles will be difficult to put a person in the conduit or cage, the quality of the filling industry and civil engineering come to use more of a form of deep foundation.
Source: Large Diameter Bored Pile Hole Formation Quality Inspection
Finally, the verticality of the mixer force axis is adjusted by the hydraulic system and the support system, and the deviation of the verticality is controlled to be less than 1.5%.
From: Reinforcement of soil-mixed piles for silt seawall foundation
The most difficult control points are: main girder upper arch, web verticality, side bending and 25000mm degree.
Sourced from: 25t/5t gantry crane box main girder fabrication technology
-The largest measured value of deviation of verticality of the hole is 2.8%.
Source: Large diameter drilled pile hole quality inspection The centerline of the crystallizer and the centerline of the tractor must be coincident, and the horizontal degree of the crystallizer is controlled within 1mm, and the vertical degree of the crystallizer is controlled within 0 ~ - 1mm.
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