JPS62133235A - Centrifugal force molded concrete member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a centrifugally formed concrete member having tensile, bending and shear resistance that can be used as a structural member of a building.

(Prior Art) Conventionally, centrifugally formed concrete members have generally been formed by embedding reinforcing bars as reinforcing materials within the concrete body.

(Problems to be Solved by the Invention) Although the conventional centrifugal force-molded concrete members have resistance to axial compressive force, they have weak resistance to tension, bending, and shearing, and are therefore prone to cracking. Moreover, the use of reinforcing bars increases the weight, and furthermore, the reinforcing bars deteriorate due to corrosion, resulting in poor durability.

(Means for Solving the Problems) The present invention solves the above-mentioned disadvantages, provides sufficient resistance not only to axial compressive force but also to tensile, bending, and shearing, as well as lightweight and durable centrifugal force. The object of the present invention is to provide a molded concrete member, in which short fibers with high tensile strength are dispersed in the concrete body, and continuous fibers with high tensile strength are embedded in a swamp in the axial direction.

The concrete body is molded into a desired shape, such as a cylinder or a prism, using a centrifugal molding frame using a conventional centrifugal force molding method.

Examples of short fibers with high tensile strength to be dispersed in the concrete body include inorganic fibers such as carbon fibers, glass fibers, and ceramic fibers, aromatic polyamides, aromatic polyetheramides, aromatic polysulfide amides, and aromatic polysulfones. Organic fibers such as amide, aromatic polyketone amide, aromatic polyamine amide, vinylon, etc. are used alone or in combination, and are applied to the concrete body at a rate of 0.
Disperse at a rate of 5-3 vol.

The continuous fibers with high tensile strength to be dispersed in the concrete body include strands of the same type of fiber as the short fibers, fiber bundles of parallel fibers, and fibers made by impregnating and binding a fiber bundle with a binder such as epoxy resin. A fibrous body consisting of a fiber bundle formed by knitting the strands into a braided form, a fiber body comprising a fiber bundle formed by knitting the strands into a braided form, the surface of which is coated with a substance that has an affinity for concrete, such as an underwater adhesive epoxy resin. A fiber body formed by impregnating and binding a fiber bundle formed by knitting the strands into a braid shape with a binder such as an epoxy resin is used singly or in combination. It goes without saying that the strands themselves can be used alone or in combination.

Such a fibrous body has a cross-sectional area ratio of 0 to the concrete body.
．． Blend at a ratio of 1 to 1 inch.

(Example) The present invention will be described below with reference to the accompanying drawings.

1 in the figure shows a concrete body centrifugally formed into a hollow prismatic body with a square cross section, and inside the concrete body 1 are short Li fibers 2 of aromatic polyamide fibers with a fiber length of 0.5 to 2 cm.
υ0.5 to 3 vat % to concrete body 1
In the illustrated example, six continuous fiber bodies 4 made of aromatic polyamide fibers are buried along the axis 3 direction of the concrete body 1. The continuous fibers 4 are buried at a cross-sectional area ratio of 0.1 to 1 inch to the concrete body 1. The continuous fibrous body 4 used in this example was one in which strands 5 of aromatic polyamide fibers were knitted into a braided cord shape and impregnated with an epoxy resin 6 and bound as shown in the third figure.

(Effects of the Invention) According to the present invention, short fibers with high tensile strength are dispersed within the concrete body to increase the strength of the concrete itself, and continuous fibers with high tensile strength are swamped and buried in the axial direction. By increasing the strength of the formed concrete member, it has sufficient resistance not only to axial compressive force but also to tension, bending, and shearing, so it can be used not only as a PC pile but also as a structural member such as columns and beams. This has the effect of providing a centrifugally formed concrete member that is lightweight and durable.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the centrifugally formed concrete member of the present invention, Fig. 2 is a sectional view taken along the line ■-■, and Fig. 3 is an enlarged plan view of the braided continuous fiber body used in the embodiment. It is a diagram. 1... Concrete body 2... Short fibers 3...
Axis 4...Continuous fiber in vitro 2 people

Claims (1)

[Claims] A centrifugally formed concrete member made by dispersing short fibers with high tensile strength in the concrete body and embedding continuous fibers with high tensile strength along the axial direction.