JPS63194057A - Reinforced pillar - 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 (Industrial Field of Application) The present invention provides a reinforced column that achieves greater strength by providing an inorganic fiber mat between a steel pipe and concrete placed inside the steel pipe. Regarding.

(Prior art) Conventionally, reinforced concrete columns that support the load of the upper part of buildings are made by appropriately arranging concrete that is strong in compression and reinforcing bars that are strong in tension, and the cross section and shape can be freely selected and formed. Mainly used in high-rise buildings.

(Problems to be Solved by the Invention) However, as buildings in recent years have become even taller, the load supported by columns has increased, and even greater strength has become necessary.

For the strength of concrete, it is better to add less water to the concrete, but in order to pour concrete smoothly into the formwork of a long column, more water is better, so it is not possible to reduce the amount of water too much. On the other hand, during curing, it is necessary to maintain an appropriate temperature with sufficient humidity for as long as possible, but if the formwork is exposed to sunlight or the outside air, the temperature may rise or fall. Also, sufficient curing was not possible because water flowed out of the formwork. Furthermore, there were other problems such as the assembling of formwork requires skill and high labor costs, and expenses such as removal and transportation are required, leading to an increase in costs.

(Means for Solving the Problems) The present invention was provided in order to solve the above problems, and it is an inorganic fiber added to the inner peripheral surface of the steel pipes 2 that are successively installed. The mat 3 is a reinforcing column 1 that absorbs and supports at least a part of the surplus water of the concrete 4 placed inside the steel pipe 2, and increases the strength of the concrete 4 inside the steel pipe 2 by sufficient curing, and also strengthens the concrete 4. The material is reinforced by a mat 3 impregnated with a portion of the material.

(Function) The reinforcing column 1 of the present invention is constructed by pouring concrete 4 into a steel pipe 2 with an inorganic fiber mat 3 attached to the inner circumferential surface, and the surplus water of the concrete 4 becomes the inorganic fiber mat. Since the concrete 4 is contained by the water-impregnated mat 3, water does not escape.
Moreover, since the steel pipe 2 constitutes an integrated structure with the concrete 4 and the mat 3, and is not removed, it is cured with sufficient humidity for a long period of time, and is protected from outside air, sunlight, etc. The effects of cooling, heating, etc. are blocked by the inorganic fiber mat 3 acting as a heat insulating layer, allowing sufficient curing at a suitable temperature, resulting in concrete 4 with strength and durability, and the steel pipes 2 increasing bending strength. is reinforced, resulting in a large reinforced column with high compressive strength.

(Example) Examples of the reinforcing column according to the present invention will be described below with reference to the drawings.

Reference numeral 2 denotes a steel pipe having a rectangular cross section, and a mat 3 of inorganic fiber such as glass wool, rock wool, carbon fiber, etc. is attached along the inner peripheral surface. Inside the steel pipe 2, reinforcing bars 5 consisting of main bars running in the length direction of the steel pipe 2 and stirrups perpendicular to the main bars are arranged, and concrete 4 is poured into the steel pipe 2. Water is absorbed by the inorganic fiber mat 3, and the water is carried by the mat 3, and the columnar concrete 4 is supplied with moisture from the surrounding surface and cured.

In addition, the reinforcing column 1 is made by fitting a joint pipe 2° into the upper end of the steel pipe 2 and fixing it by welding or riveting, and fitting another steel pipe 2 into this joint pipe 2°, and performing reinforcement and concrete pouring. They can be set up sequentially.

The surface of the mat 3 is covered with a knitted or woven carbon fiber fabric to withstand concrete pouring.

(Effects) As described above, in the reinforced column according to the present invention, the inorganic fiber mat added to the inner circumferential surface of the steel pipes that are successively installed is used to absorb at least a portion of the surplus water of the concrete cast inside the steel pipes. The moisture absorbed within the inorganic fiber mat provides sufficient moisture, and both the mat and steel pipes are integrated with the column-shaped concrete, so it can last for a long time. Sufficient curing is given over a period of time. Furthermore, the mat prevents heating and cooling caused by sunlight and outside air from the outside of the steel pipe, allowing curing to occur at an appropriate temperature, resulting in high-quality concrete with high strength.

Furthermore, as excess water is absorbed into the mat as described above, it is possible to have a relatively high water-to-cement ratio, which facilitates driving.

Furthermore, there is no need for a formwork for concrete pouring, and there is no need for expenses such as formwork costs, assembly, removal, transportation, etc.

As a result, the column has both the bending strength of a steel pipe and the compression strength of a concrete column, and is insulated by an inorganic fiber mat surrounding the outer peripheral surface of the concrete column.
It is an excellent reinforced pillar that also has fire resistance.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of a reinforcing column according to the present invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a perspective view of a joint portion of the same embodiment. 1... Reinforced column, 2... Steel pipe, 2°... Joint, 3...
...mat, 4...concrete, 5...reinforcement.

Claims (1)

[Claims] A reinforced column characterized in that an inorganic fiber mat attached to the inner circumferential surface of sequentially installed steel pipes absorbs and supports at least a portion of surplus water of concrete cast within the steel pipes. .