Steel pipe-concrete composite pile, process for production of the pile, and steel pipe for use in steel pile-concrete composite pile

Abstract

Disclosed is a steel pipe-concrete composite pile, in which the inside of a steel pipe is lined with a concrete or a concrete is filled in the inside of a steel pipe. In the steel pipe-concrete composite pile, the relationship represented by the formula: 325 N / mm2 2) represents the design yield strength of the steel pipe; and sc (N / mm2) represents the compressive strength of the concrete) is fulfilled. In the steel pipe-concrete composite pile, the relationship represented by the formula: D / t = 80+80(2R / D)1 / 4 (wherein D (mm) represents the diameter of the steel pipe; t (mm) represents the thickness of the steel pipe sheet; and R (mm) represents the thickness of the concrete) is also fulfilled. The steel pipe-concrete composite pile has the most suitable structure for the use of a material having high yield strength.

Description

technical field [0001] The present invention relates to a steel pipe concrete composite pile (Steel Composite Concrete Pile) composed of a steel pipe and concrete integrated on the inner surface of the steel pipe, a manufacturing method thereof, and a steel pipe used for the steel pipe concrete composite pile. [0002] In this specification, terms expressing the material strength of steel pipes are defined as follows. [0003] (a) Design yield strength (design yield strength) [0004] The design yield strength (σyd) means the yield value used in various design criteria such as buildings, roads, and port fields, or design calculations approved by the Minister of Land, Infrastructure, Transport and Tourism. Here, the design yield strength is set in the vicinity of the lower limit value (standard lower limit value) within the range of the deviation in consideration of the variation in the actual yield strength. In the current field of pile foundations, steel pipe piles and conc...

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Problems solved by technology

[0018] However, the interaction between the steel pipe and concrete of the steel pipe concrete composite pile is complicated by the early buckling of the steel pipe, the decrease in the strength of the pile due to the crushing of the concrete, or the increase or decrease in the strength of the concrete due to the degree of confinement of the steel pipe. It is not possible to simply increase the strength of steel pipes or concrete

[0019] However, in the current situation, there are no documents showing the optimum structure of the concrete-filled steel pipe composite pile in the case of using high-strength steel materials, and development is desired.

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