JP2001123665A - Execution method for concrete structure, bar arrangement stand, balloon spacer, and form used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an execution method for a concrete structure generating no cold joint at the connection portions between the column sections and wall sections of the concrete structure, capable of easily obtaining the prescribed strength and durability of the concrete structure, sharply simplifying the erecting work of forms required for forming the wall sections, and making these work very accurate and simple and provide bar arrangement stands, balloon spacers, and the forms used for the execution method. SOLUTION: Forms are erected at the interval corresponding to the thickness of the wall sections connecting the column sections arranged with reinforcing bars, a proper number of bar arrangement stands are erected at portions for both end sections of the wall sections and between them, and balloon spacers are closely arranged between both end sections of the bar arrangement stands and the forms. Concrete is filled between the forms, the balloon spacers are removed before the concrete is hardened, concrete is filled after the balloon spacers are removed, and the column sections and the wall sections of the concrete structure are integrally formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete structure in which a cold joint does not occur, a reinforcing arrangement stand used for the method, and a balloon spacer.

[0002]

2. Description of the Related Art As is well known, when a pillar formed at a position opposite to a wall and a wall connecting the pillars are to be constructed with concrete, a reinforcing bar is built in each pillar. At the same time, molds are erected while maintaining an interval corresponding to the thickness of the wall portion, and these molds are buried in the wall portions, with the interval being maintained via a number of gap holding metal fittings. The required number of rebars are erected and held via the gap holding fittings.

[0003] After that, concrete is filled over the entire form, and after the form is hardened, the form is removed to perform the work.

[0004]

However, in the above-mentioned conventional method of constructing a pillar portion and a wall portion, an assembling operation using a large number of gap holding fittings is required to hold a gap between the formwork. Therefore, there is a problem that such work is very complicated, and the construction cost is increased, and the concrete of the pillar portion to be filled before the wall portion is completely hardened before the wall is hardened. When the concrete is filled into the wall in this state, the cold joint is formed in the cold joint. (Defective joints) are formed and the strength of the wall is greatly reduced, and after the wall is completed, it is easy to peel off and separate from the cold joint of the wall and to cause water leakage. It has been a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to eliminate the possibility of generating a cold joint at the joint between a column and a wall in a concrete structure. As a result, the desired strength and durability of the concrete building can be easily obtained, and the work of assembling the rebar and forming the formwork required for forming the wall is greatly simplified. An object of the present invention is to provide a bar arrangement stand and a balloon spacer that can be operated very accurately and simplified.

[0006]

In order to achieve the above object, in a method for constructing a concrete structure according to the present invention, a method for constructing a concrete structure according to the present invention comprises the steps of: Along with erecting the formwork while maintaining an interval corresponding to the above, after erecting a suitable number of reinforcing stand between the formwork and the portions to be both ends of the wall portion, A required number of reinforcing bars are erected through reinforcing bar holding grooves formed in the vertical direction of the reinforcing bar stand, and at least both ends of the reinforcing bar stand and the formwork which are erected at least at portions to be both ends of the wall portion. In the meantime, after densely arranging balloon spacers for restricting the inflow of the concrete to be filled into the pillars in the wall direction, concrete is filled between the formwork, and when the filled concrete is uncured. The concrete structure by removing the balloon spacers. It is characterized in that to form the column portion and the wall portion of the object.

Further, according to the present invention, a reinforcing stand used for the method of constructing a concrete structure is provided with a vertical plate having a height corresponding to a wall height, and a lower portion of the vertical plate. A fixed flange portion extending horizontally from
And a reinforcing-bar holding groove formed at a required interval on an edge portion of the vertical plate portion.

In this case, it is desirable that the rebar holding groove is formed so as to be inclined so that the rebar is dropped and held.

Further, the present invention is characterized in that a curved holding piece for holding the outer peripheral surface of the balloon spacer is extended on the reinforcing bar stand.

Further, the present invention is characterized in that the balloon spacer used in the method for constructing a concrete structure has a concave groove in which both ends of the reinforcing bar stand can be fitted and held. It is.

The formwork used in the construction method according to the present invention includes a vertical plate portion, a flange portion horizontally extending outward from a lower end portion of the vertical plate portion, and a longitudinal portion of the flange portion. And a column fitting hole penetrated at required intervals along the direction, and the lower end portion of the column supporting the vertical plate portion penetrates through the column fitting hole to form a foundation or soil. It is characterized in that it is driven into the inside to support the formwork at predetermined intervals.

In this case, each of the columns supporting the opposed formwork is connected at its upper end, for example, by a substantially inverted concave connecting metal fitting having wedge-shaped engaging portions at both ends, thereby reducing the formwork interval. It is desirable to regulate.

Further, in the present invention, it is desirable that the connection fitting is configured to be slidably adjustable in accordance with the interval between the molds.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the accompanying drawings.

As shown in FIG. 1, a concrete structure 1 according to this embodiment has a wall portion W connecting columns (not shown) on which reinforcing bars 2 are arranged, and a wall portion W having a thickness equal to the thickness of the wall portion W. The molds 10 and 10 are erected while maintaining a corresponding interval D, and a portion between the molds 10 and 10 that is both ends of the wall portion W and an appropriate number of reinforcing stand S are provided therebetween. After being erected, a required number of reinforcing bars 11 are erected through a plurality of reinforcing bar holding grooves 22 formed in the up and down direction of each of the reinforcing bar stands S, and at least a portion serving as both ends of the wall W. After the balloon spacers 30, 20 for restricting the inflow of the concrete filled in the pillar portion in the direction of the wall portion are densely interposed between both ends of the reinforcing bar stand erected in the form and the formwork, Frame 10,
When the filled concrete is uncured, the balloon spacer 30 is removed, and sufficient vibration is applied to the concrete that has been later driven into the wall W or the beam to impart sufficient vibration to the balloon spacer 30. The concrete part 1 is cast into the pillars and the wall W
And are formed.

The formwork 10 used in the construction method according to this embodiment includes a vertical plate portion 12 and the vertical plate portion 12.
13 extending horizontally outward from the lower end of the
And a column fitting hole 14 penetrated at predetermined intervals along the longitudinal direction of the flange portion 13, and the column fitting hole 14 supports the vertical plate portion 12. Prop 15
Is penetrated and driven into a foundation or soil to support the formwork at predetermined intervals.

The mold 10 is made of hard resin or steel, and when it is made of steel, its surface is coated with an inorganic material which becomes vitreous at room temperature to prevent scratches. It is desirable to form it and to have excellent releasability from concrete.

The upper ends of the supporting columns 15 for supporting the opposed formwork 10, 10 are connected by a substantially inverted concave connecting metal fitting 50 having wedge-shaped engaging portions 52, 54 at both ends. To regulate the form spacing.

As shown in FIG. 1, the connecting fitting 50
It has an engaging portion 52 so as to be slidably adjustable in accordance with the interval between the mold frames 10, 10, and has a screw body 56.
Are fixed to each other, and a movable piece 53 having an engaging portion 54 and a sliding long hole 55 is engaged with the upper end of one of the columns 15. After the screw 56 of the fixed piece 51 is inserted into the elongated hole 55 and the movable piece 53 is slid so as to correspond to the distance between the two columns 15, 15, a nut is screwed into the screw 56 and the nut is screwed. Are tightened so that the intervals between the molds 10 and 10 are accurately maintained. Needless to say, the connection fitting may be one in which the fixed piece and the movable piece are integrated.

As shown in FIG. 2, the reinforcing bar stand S has a vertical plate portion 2 having a height corresponding to the height of the wall portion W.
1, a fixed flange portion 23 extending horizontally from a lower portion of the vertical plate portion 21, and the reinforcing bar holding grooves 22 formed at required intervals on an edge portion of the vertical plate portion 20. ing.

In this case, the reinforcing bar holding groove 22 is
For example, it is formed to be inclined downward by about 30 to 45 degrees so that 1 is dropped and held.

On the other hand, as shown in FIG. 2, the balloon spacer 30 is formed with a groove 31 capable of fitting and holding both ends of the reinforcing bar stand S, and the groove 31 is attached to the reinforcing bar 11. Later, the bar arrangement stand S and both spacers 30, 30 are fitted by being fitted to both ends of the bar arrangement stand S and held upright.
However, since the space between the molds 10 and 10 is closed, there is no fear that the concrete filled in the pillar portion flows into the molds, and therefore, the occurrence of cold joints can be reliably prevented. Reference numeral 32 in the drawing denotes an air discharging tube.

FIG. 3 shows a modification of the bar arrangement stand S used in the present invention.
Except that a required number of curved holding pieces 24 for holding the outer peripheral surface of the balloon spacer 30 are formed along the vertical direction of both end portions, other configurations are the same as those of the reinforcing bar stand shown in FIG. .

[0024]

As described above, according to the first aspect of the present invention, the wall connecting the pillars on which the reinforcing bars are arranged is maintained at an interval corresponding to the thickness of the wall. After erecting the formwork, and after erecting a suitable number of reinforcing bar stands between the formwork and the portions serving as both ends of the wall, and
A required number of reinforcing bars are erected through reinforcing bar holding grooves formed in the up and down direction of each of the reinforcing bar stands, and both ends of the reinforcing bar stand and a formwork which are erected at least at portions which become both end portions of the wall portion. After densely arranging a balloon spacer for restricting the inflow of the concrete to be filled into the pillar in the wall direction, the concrete is filled between the formwork, and the filled concrete is uncured. At this time, the balloon spacer is removed, and at this time, the brittle concrete on the surface layer of the concrete adhered to the surface of the balloon spacer can also be removed, and the column and wall of the concrete structure are integrally formed. As a result, there is no concern that a cold joint will occur at the connection between the column and the wall in the concrete structure, and the predetermined strength and It is possible to obtain a durability easily, standing 設作 industry mold required to form the wall portion is greatly simplified, and further, they work becomes very accurately yet simply.

According to the second aspect of the present invention,
A reinforcing plate stand used for the method of constructing the concrete structure, a vertical plate portion having a height dimension corresponding to the wall height, and a fixed flange portion extending horizontally from a lower portion of the vertical plate portion. And the reinforcing bar holding grooves formed at required intervals on the edge of the vertical plate, so that the work of mounting the reinforcing bar on the wall is greatly simplified.

Further, according to the third aspect of the present invention, the reinforcing bar holding groove is formed so as to be inclined so that the reinforcing bar is dropped and held. Work) is accurate, and the work is greatly simplified.

According to the fourth aspect of the present invention, a curved holding piece for holding the outer peripheral surface of the balloon spacer is extended from the reinforcing arrangement stand. It is easy to seal with the reinforcement arrangement stand and the balloon spacer, and it is possible to reliably prevent concrete from flowing from the pillar portion.

According to the fifth aspect of the present invention, since the balloon spacer used in the method of constructing a concrete structure has recesses formed at both ends of the reinforcing arrangement stand so as to be fitted and held. The structure of the bar arrangement stand can be greatly simplified, and the manufacturing cost can be reduced.

According to a sixth aspect of the present invention, there is provided a formwork comprising a vertical plate portion, a flange portion extending horizontally outward from a lower end portion of the vertical plate portion, and a longitudinal portion of the flange portion. And a column fitting hole penetrated at required intervals along the direction, and the lower end portion of the column supporting the vertical plate portion penetrates through the column fitting hole to form a foundation or soil. Since it is configured to be driven into the mold and to support the formwork at a predetermined interval, there is no need to attach and hold a large number of holding brackets as in the related art so as to maintain the formwork interval, so assembling work of the formwork Is dramatically simplified, and since the holding bracket is not buried in the concrete as in the prior art, there is no problem that a void is generated around the holding bracket, so that the wall A decrease in strength can be reliably prevented.

In the invention according to claim 7,
Since the upper ends of the columns supporting the opposed formwork are connected by a connection fitting to regulate the formwork interval, there is no fear that the connection fitting is buried in the concrete, and again. Since it can be used, manufacturing costs can be reduced.

Further, in the invention according to claim 8, since the connecting fitting is configured to be slidably adjustable in accordance with the spacing between the molds, even if the dimensions of the molds are different, it is possible to adjust the size. There are many excellent effects, such as the ability to connect both columns in correspondence.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for constructing a concrete structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a balloon spacer used in the construction method.

FIG. 3 is a perspective view showing a modified example of a reinforcing stand used in the construction method.

[Explanation of symbols]

 S Reinforcement stand 1 Concrete building 10 Formwork 11 Reinforcement 12 Vertical plate 13 Flange 14 Support post fitting hole 15 Prop 21 Vertical plate 22 Reinforcing bar holding groove 23 Fixed flange 30 Spacer 31 Depressed groove

Claims (8)

[Claims] Claims: 1. A wall connecting a column on which a reinforcing bar is arranged,
The formwork is erected while maintaining an interval corresponding to the thickness of the wall, and portions between the formwork which are both ends of the wall and an appropriate number of reinforcing bars are erected therebetween. After that, a required number of reinforcing bars are erected through reinforcing bar holding grooves formed in the up and down direction of each of the reinforcing bar stands, and both ends of the reinforcing bar stands erected at least at portions that become both ends of the wall portion. After tightly interposing a balloon spacer for restricting the inflow of concrete to be filled into the pillar portion in the wall direction between the mold and the formwork, concrete is filled between the formwork and the filled concrete. A method for constructing a concrete structure, comprising forming a column and a wall of a concrete structure by removing the balloon spacer when the material is not yet cured. 2. The bar arrangement stand comprises a vertical plate having a height corresponding to a wall height, a fixed flange extending horizontally from a lower portion of the vertical plate, and the vertical plate. The reinforcing bar stand used in the method for constructing a concrete structure according to claim 1, wherein the reinforcing bar groove is formed at a required interval at an edge of the portion. 3. The reinforcing bar stand according to claim 2, wherein the reinforcing bar holding groove is formed to be inclined so that the reinforcing bar is dropped and held. 4. The arrangement according to claim 2, wherein a curved holding piece for holding an outer peripheral surface of the balloon spacer is extended from the reinforcing arrangement stand. Muscle stand. 5. The concrete according to claim 1, wherein the balloon spacer is formed with a concave groove capable of fitting and holding both ends of the reinforcing bar stand. Balloon spacers used in the construction method of structures. 6. The formwork includes a vertical plate portion, a flange portion extending horizontally outward from a lower end portion of the vertical plate portion, and a flange extending at required intervals along a longitudinal direction of the flange portion. And a support hole provided therein, wherein a lower end portion of a support supporting the vertical plate portion can be driven into the support hole. A formwork used in the method for constructing a concrete structure according to claim 3. 7. Each strut supporting the opposed formwork,
7. The formwork according to claim 6, wherein the upper ends thereof are connected by connecting fittings to regulate the formwork interval. 8. The mold according to claim 7, wherein the connection fitting is configured to be slidable.