JPH0932108A - Reinforcing method for concrete structure and concrete molding form and reinforcing member - Google Patents

Abstract

PURPOSE: To shorten a time for assembly and removal at a site and to remarkably increase strength against an earthquake by a method wherein the inner surface of a form body built by processing steel sheets is filled with a number of stud bolts or doweled bars. CONSTITUTION: A steel sheet is bent or welded to form a form body 1 and flanges 3a-3d are integrally formed at the peripheral edge thereof. The flanges 3a-3d and the inner front of the form body 1 are filled with a number of stud bolts or doweled bars 7 for welding to form forms for molding concurrent and a reinforcing member. The forms and reinforcing member is used as a part or the whole of forms for the given part, such as columns 2, beams 4 and 4, of a concrete structure and remains as it is after placing and curing of concrete. This constitution forms the form body 1 completely integrally with concrete and structurally reinforces the concrete structure.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a reinforced concrete (R)
The present invention relates to a method for strengthening a steel frame reinforced concrete (SRC) structure or C) and a reinforcing member that also serves as a mold for concrete molding.

[0002]

2. Description of the Related Art Conventionally, in the case of molding concrete in this kind of structure, it takes time and time to assemble a wooden formwork, pour concrete into the formwork to cure and solidify, and then remove the formwork. To do. This method is the same regardless of the size of the structure.

In the Great Hanshin Earthquake of January 1995, which collapsed buildings, highways, bridges, many houses and the like, it is required to further strengthen concrete structures.

Therefore, as a countermeasure against this, it is conceivable to increase the number of reinforcing bars or increase the thickness and size of the steel frame, but this has its own limit, and existing columns and beams made of concrete are made of steel plates. Adhesive coating is also being considered,
Since this iron plate is not completely integrated with the concrete structure, there is a fear of peeling or the like against a large earthquake, and the strength is insufficient.

[0005]

DISCLOSURE OF THE INVENTION The present invention reduces the time and effort required for assembling and dismantling a formwork on site, and is also a formwork that has a significantly higher strength against earthquakes than conventional concrete structures. The present invention proposes a reinforcing member.

[0006]

The present invention is an iron plate (steel plate).
Forming a concrete column or beam by bending or welding to prefabricate it, and part of the molding object such as the wall, column or beam adjacent to the molding object A strip-shaped overhanging piece (flange) is integrally formed so as to be in contact with each other, and a large number of stud bolts or dowel bars are implanted and welded on the entire inner surface of the formwork including this overhanging piece. After the concrete is cast inside the mold and solidified, the mold is left as it is and used as a reinforcing member for externally applying columns, beams and the like.

[0007]

By using such a formwork, for example, in a portion where the load is structurally most applied, it is not only completely integrated with the object to be molded after the concrete is poured, but also one of the adjacent molded objects is Since the parts are completely integrated, the structural strength is greatly increased.

An embodiment in which the formwork / reinforcing member of the present invention is applied to a pillar of a reinforced concrete building will be described below with reference to the drawings.

[0009]

EXAMPLE 1 1 is a mold body, which is formed by bending a steel plate having a thickness of 6 to 12 mm into an L-shaped cross section corresponding to a corner post 2 of a concrete molding target, and the length thereof is an upper / lower floor slab. If the length is too long, it will be connected by welding at the site. Reference numeral 3 denotes a strip-shaped flange projecting outward along the entire periphery of the mold body 1, which is formed by further bending the periphery of the body 1 or by welding the same material as the body 1. .

When the object to be molded is the corner post 2, the left and right upper ends of the mold 3 are connected to the post 2, respectively.
A notch 3e is formed so as to match the cross-sectional shape of No. 4, and an outward flange 3b bent in an L-shaped side surface is provided at the notch 3e. Reference numeral 3c denotes an outward flange formed on the head edge of the main body 1, which contacts the lower surface of the upper slab floor slab (not shown), and flanges 3a, 3a on the left and right side edges of the main body 1 contact the walls 5, 5, 1 The flange 3d at the bottom edge is the lower slab floor slab 6
Will be in contact with the upper surface of.

Form body 1 and flange 3 on the entire periphery thereof
Inside the (3a to 3d) (that is, the inner surface as the form), a large number of stud bolts (or gibber streaks) 7 are provided over the entire surface.
Is implanted and welded by a stud welder.

However, the mold body 1 in which a large number of stud bolts (or gibber muscles) 7 are thus implanted is manufactured in advance in a factory and transported to the site, and a structurally large load is mainly applied. It is used as a part or all of the formwork of the part, that is, the corner post 2 which is the main pillar or the part such as the beam as in the present embodiment, and the other parts are assembled by a wooden formwork on site as in the conventional case. To be

When the formwork main body 1 is a formwork for a column and is long, the main body 1 divided in the lengthwise direction is connected by welding or bolting on site.

When the concrete corner post 2 is molded as shown in the figure, after the reinforcing bars 8 are assembled inside, a mold formed by the mold body 1 and a wooden mold (not shown). Concrete 9 is cast in the frame, and when it is solidified, the wooden form is removed, but the form body 1 made of steel plate is left as it is.

As a result, the formwork body 1 is completely integrated with the solidified concrete 9 through the stud bolts (or gibber bars) 7, and not only for the columns 2 as shown in the drawing, but also for the peripheral flanges 3. Stud bolt (or gibber muscle)
Since the wall 5 and the upper and lower floor slabs 6 are also integrated with each other through 7, the mold body 1 serves as a reinforcing member and has an extremely strong structure.

In this embodiment, the example applied to the pillar of the reinforced concrete structure has been described, but it can also be applied to beams, pedestals of elevated expressways, bridge piers, etc., such as a cylindrical pier. In this case, a cylindrical form body 1 vertically divided into 2 or 3 to 4 is used, and the flange 3 is unnecessary, and a large number of stud bolts 7 (or gibber streak) planted on the inner surface of the body 1. By doing so, it is possible to make it a strong bridge pier by biting it into the cast concrete and integrating it.

[0017]

The present invention is as described above, and a concrete structure such as a pillar or a beam to which a large load is structurally applied is obtained by preliminarily implanting a large number of stud bolts (or gibber bars) on the inner surface of a steel plate mold. It is used as a part or all of the mold for molding, and after pouring and solidifying the concrete, the mold is left as it is, so that it is completely integrated with the concrete to be molded as a reinforcing member, so it is extremely strong. It has a unique structure and can handle a large earthquake.

Moreover, since this formwork / reinforcing member is manufactured in advance in a factory, there is no need to assemble it on site like conventional wooden formwork and remove it after solidification of concrete, so that the construction period can be shortened. It has advantages such as

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example in which a concrete molding formwork / reinforcement member according to the present invention is used for molding a corner column of a reinforced concrete building.

FIG. 2 is a perspective view of the reinforcing member serving also as the mold frame shown in FIG. 1, as viewed from the inside.

FIG. 3 is a plan explanatory view of FIG. 1.

[Explanation of symbols]

 1-Form Main Body 2-Corner Pillar 3-Outward Flange 4-Beam 5-Wall 6-Deck Slab 7-Stud Bolt (or Gibel Reinforcement) 8-Reinforcing Bar 9-Concrete

Claims (2)

[Claims] 1. A large number of stud bolts or gibber streaks are planted on the inner surface of a form body formed of steel plate in the form of a concrete forming target, and the stud bolts or dowel lines are provided at predetermined portions such as columns and beams of concrete structures. Used as part or all of the formwork of
A method for strengthening a concrete structure, characterized in that after the concrete is poured and solidified, it is left as it is to completely integrate the formwork body with the concrete and structurally strengthen it. 2. A form body for forming a concrete target pillar, beam or the like is formed by bending or welding a steel plate, and a peripheral edge of the form body is adjacent to the object to be formed. A flange is integrally formed so that a part of the object to be molded such as a wall, a pillar, or a beam also comes into contact, and a large number of stud bolts or dowels are implanted and welded on the entire inner surface of the flange and the form body. Reinforcing member that also serves as a formwork for concrete molding.