JPH1144101A - Repairing reinforcement construction method of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To visually confirm a mortar filling condition from outside at work when mortar is invertedly placed on an increased concrete wall or the like. SOLUTION: A concrete wall 4 or a brace is installed or constructed among a floor 1, a column 2 and a beam 3 or an existing wall of a reinforced concrete building or the like in a condition of not directly contacting one or four sides with them. Next, a porous sheet 6 having pores in a degree of holding an interval in the almost same as a thickness of the concrete wall 4 or the like or slightly thinner than that and of hardly flowing out internally injected mortar before curing, is arranged in a noncontact part, and mortar is filled in a space formed between porous sheets 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for reversing a mortar on a concrete wall or a brace or the like and a method for reinforcing a concrete column or a concrete beam by filling and coating the mortar around its periphery. The present invention relates to a method for repairing and reinforcing concrete structures in which the state of filling of mortar can be visually recognized during work.

[0002]

2. Description of the Related Art Reinforced concrete structures such as reinforced concrete buildings or reinforced concrete bridges need to be reinforced with the improvement or change of required performance standards.

[0003] As a method of reinforcement, if the place is a wall, the existing wall is removed, a new wall is reconstructed, a wall is added (newly installed), a steel frame brace is newly installed, or these are added. In general, this is performed.

[0004] The conventional method generally used in these works is that, when the work is a wall, the upper end of the work is about 20 to 3 from a beam or the like as shown in FIGS. 5 and 6, for example.
After constructing a wall main body a in which a reinforcing bar or the like is buried so as to be directly connected to the floor surface on both sides so that it is located about 0 cm below, and the lower end is directly connected to the floor surface, After closing both sides with a template e having an air vent c and a press-in port d, a slat f and a single-tube presser g, mortar is pressed into the space b through the press-in port d formed in the template e. (Reverse strike) to fill it. In this case, in order to prevent the outflow of the mortar that has been hit in the reverse direction, it is necessary to attach a mortar seal h on the upper and lower sides.

When a brace is to be newly installed, the brace body is mounted between a concrete floor, a concrete column, a concrete wall, a concrete beam, etc. without directly contacting any of them. In the same manner as when the wall is used for the wall, a template or the like is attached, and the mortar is reverse-punched in the space formed between the template.

On the other hand, as a method of reinforcing a column or a beam, as shown in FIG. 7, a steel plate is wound around a column j having an inner diameter larger than the outer circumference of an existing column i (generally referred to as steel plate winding). .), The mortar was filled by press-fitting into the space b formed between the column i and the cylinder j. There has also been a method of arranging a so-called reinforcing cage so as to form an appropriate space around the pillar, further arranging a template around the cage, and filling the inside with concrete (concrete wrapping) ( Not shown).

[0007]

In the above conventional example,
When rebuilding or adding a wall, as described above, the work of attaching and removing the template e and the like is required, so that not only time is required but also labor is added, and the construction period is prolonged. It was.

However, in either method, since the template e or the steel plate is formed of an opaque material,
Since the space b is concealed by the template e or the cylinder j, the mortar pressed into the space b is
It was impossible to visually check whether or not the space b was evenly filled. In this case, the mortar injected into the space b was leaked from the air vent port c and was used as the only criterion for estimating the filling condition. However, this is used as an accurate criterion for determining the filling condition. It was not promising, and as a result, the mortar loading was not always inadequate. In particular, in the case of walls and braces, etc., a gap that should not be created between the mortar and the lower surface of the beam existing above the mortar may result, or an upper part of a space into which the mortar is pressed, for example, When severe unevenness is present on the lower surface of the beam, the entire area of the concave portion is not completely filled with the mortar, and may remain as a void. Moreover, these construction results can be confirmed only after the template e and the tube j are removed, and when the mortar amount is insufficient, the construction must be performed again. It had a very big problem.

[0009]

In order to solve the above-mentioned problems, a method for repairing and reinforcing a concrete structure according to the present invention (claim 1) has been developed. After installing or constructing a concrete wall or brace between the concrete beam or existing concrete wall without directly contacting one to four sides, the non-contact portion has a thickness substantially equal to or greater than the thickness of the concrete wall or brace. A porous sheet or a porous plate having a slightly thinner space and having such an extent that the mortar injected therein is hard to flow out before curing is provided and formed between the porous sheet or the porous plate. The mortar is filled in the space to be formed.

In order to solve the above-mentioned problems, a method for repairing and reinforcing a concrete structure according to the present invention (claim 2) is provided on the outer periphery of a concrete pillar or a concrete beam of a reinforced concrete structure such as a reinforced concrete building or a reinforced concrete bridge. Winding a porous sheet or a porous plate having pores of such a degree that the same or slightly smaller than the additional filling thickness and having such a degree that the mortar injected therein hardly flows out before curing, The mortar is filled in a space formed between the outer peripheral surface and the porous sheet or the porous plate.

Further, in the method for repairing and reinforcing a concrete structure according to the present invention (claim 3), in order to solve the above problems, the mortar is a non-shrink mortar.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a method for repairing and reinforcing a concrete structure according to the present invention will be described with reference to FIGS. An existing concrete floor of a reinforced concrete structure such as a reinforced concrete building, 2 is a concrete column, and 3 is a concrete beam.

4 is such that both ends are adhered to the concrete pillar 2 (or existing concrete wall) and the lower end is adhered to the concrete floor 1 so that the upper end is located about 20 to 30 cm below the lower end of the concrete beam 3. The reinforcing concrete wall (not shown) is naturally arranged in the additional concrete wall 4. Further, since the additional concrete wall 4 is constructed as described above, a space 5 is formed at the upper end between the concrete beam 3 and the upper end thereof.

Reference numeral 6 denotes two porous sheets or porous plates disposed in the space portion 5 while maintaining a gap substantially equal to the thickness of the additional concrete wall 4. Here, the porous sheet is referred to as a porous sheet. For example, a wire mesh or a porous plate refers to a metal plate or the like having a large number of holes.

The space 5 between the two porous sheets 6 and the like is filled with mortar as described later, so that the holes of the porous sheets 6 and the like are filled with the mortar before curing. It is formed in such a size that it does not easily flow out accidentally. The porous sheet 6 and the like have one or more mortar pressure inlets (not shown) formed in a part thereof.

Then, the mortar is pressed into the space 5 from the mortar pressure inlet (reverse strike). Then, the mortar can be visually observed from the outside through the holes of the porous sheet 6 or the like, and as a result, the filling state of the mortar in the space 5 can be visually recognized. When the filling of the mortar is started, the air in the space 5 is continuously discharged to the outside through the holes of the porous sheet 6 or the like, so that the filling of the mortar can be performed smoothly.

The porous sheets 6 and the like may be provided with the same interval as the thickness of the additional concrete wall 4, for example, but may be provided at an interval smaller than the thickness of the additional concrete wall 4, and moreover. The concrete wall 4 may be disposed at a position slightly retracted inside from both sides, and in this case, the reverse mortar layer is thinner than the additional concrete wall 4, that is, it is formed in a concave shape. By applying a mortar from the outside so as to fill the recess, the mortar can be finished flush with the additional concrete wall 4, and the appearance is improved.

Although the flow value of the mortar used for the reverse beating is not particularly limited, the porous sheet 6
It is preferable to set the value to such an extent that the mortar does not flow out of the holes, and in consideration of the condition after curing, it is preferable to use a non-shrinkable mortar. Reinforcement is also arranged in this reverse mortar layer.

In the above, a new concrete wall is newly installed (extended) in a place where no existing concrete wall exists.
Although the above example has been described, the same applies when a new wall is reconstructed after the existing wall is removed by destruction or the like.

In the above description, an example in which the additional concrete wall 4 is newly constructed or rebuilt has been described. However, the case where the brace 7 is installed is basically the same.

As shown in FIG. 3, the space 5 of the steel frame brace 7 is supported by a reinforcing bar or the like so as not to be in direct contact with the concrete floor 1, the concrete column 2, the concrete beam 3 or the existing concrete wall. It is attached in a floating state. Therefore, although the space 5 ′ is inevitably formed on the four circumferences of the brace 7, the porous sheet 6 with respect to the space 5 ′ on the four circumferences of the brace 7 is different from the additional concrete wall 4 and the like. The mounting of the mortar and the reverse of the mortar are exactly the same.

Next, a method for reinforcing concrete columns or concrete beams among the embodiments of the method for repairing and reinforcing concrete structures according to the present invention will be described with reference to FIG.

As described above, the reinforcement of the concrete columns 8 and the like is performed by thickening the existing concrete columns 8 and the like. In this case, the porous sheet 6 and the like are wound around the outer periphery of the concrete columns 8 and the like. I will attach it. That is, the porous sheet 6 or the like is wound around the existing concrete column 8 with a thickness for filling the mortar to be added to the outer periphery or a slightly smaller interval than the thickness. As a result, the shape of the porous sheet 6 or the like assumes a cylindrical shape.

Then, mortar is filled in the space 5 "formed between the concrete pillars 8 and the like between the porous sheets 6 and the like. The other processes are the same as those for the additional concrete wall 4.

[0025]

As described above, according to the method for repairing and reinforcing concrete structures according to the present invention (claim 1), concrete floors, concrete columns, concrete beams or existing concrete walls of reinforced concrete structures such as reinforced concrete buildings. In the meantime, after attaching or constructing a concrete wall or a brace without directly contacting one to four sides, the non-contact portion is maintained at a distance substantially equal to or slightly smaller than the thickness of the concrete wall or the brace, and Arrange a porous sheet or a porous plate having pores to such an extent that the mortar injected therein is difficult to flow out before curing, and fill the space formed between the porous sheet or the porous plate with the mortar. In this way, the filling condition of mortar that strikes inside the space can be visually recognized from the outside, and as a result The necessary and sufficient amount of mortar can be back-struck, the back-mortar can be securely bonded to the beam, and the air in the space must be continuously discharged when the mortar is filled. To become
It is possible to perform smooth mortar injection, and since there is no work of attaching and detaching a template or the like as in the above-described conventional example, not only the labor can be significantly reduced, but also the construction period can be shortened. This has the effect.

According to the method for repairing and reinforcing a concrete structure according to the present invention (claim 2), the outer periphery of a concrete pillar or a concrete beam of a reinforced concrete structure such as a reinforced concrete building or a reinforced concrete bridge has the same thickness as the additional filling thickness. Wrap a porous sheet or a porous plate having holes that are slightly thinner than that, and have such a degree that the mortar injected into the interior is difficult to flow out before curing, and the outer surface of the column or beam and the porous Since the mortar is filled in the space formed between the sheets or the porous plates, the filling state of the mortar to be filled in the space can be visually recognized from the outside, and as a result, necessary and sufficient mortar filling can be performed. It has the effect that it can be performed and the same effect as described above.

Further, according to the concrete structure repair / reinforcement method according to the present invention (claim 3), the mortar is a non-shrink mortar, so that in addition to the above-mentioned effects, deformation of the filled mortar even after curing. It has the effect of not coming.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a method of mortar reverse-facing a concrete wall or a brace in a method of repairing and reinforcing a concrete structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing another example of a mortar backlash method for a concrete wall or a brace in the method of repairing and reinforcing a concrete structure according to the present invention.

FIG. 4 is a cross-sectional view showing one embodiment of a method for reinforcing concrete columns or concrete beams in the method of repairing and reinforcing concrete structures according to the present invention.

FIG. 5 is a front view showing a conventional example of a mortar reverse hitting method for a concrete wall or a brace.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a cross-sectional view showing a conventional example of a concrete column reinforcing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete floor 2 Concrete pillar 3 Concrete beam 4 Additional concrete wall 5, 5 ', 5 "space 6 Porous sheet 7 Brace 8 Concrete pillar

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI E04B 2/56 621 E04B 2/56 621P 632 632B 632P

Claims (3)

[Claims] 1. After a concrete wall or brace is attached or constructed between a concrete floor, a concrete column, a concrete beam or an existing concrete wall of a reinforced concrete structure such as a reinforced concrete building without directly contacting one to four sides, In the non-contact part,
A porous sheet or a porous plate is provided which has an interval substantially equal to or slightly smaller than the thickness of the concrete wall or the brace, and which has holes such that the mortar injected therein hardly flows out before curing. A method for repairing and reinforcing concrete structures, characterized in that a mortar is filled in a space formed between the porous sheets or the porous plates. 2. A concrete column or a concrete beam of a reinforced concrete structure, such as a reinforced concrete building or a reinforced concrete bridge, is maintained at an interval equal to or slightly smaller than an additional filling thickness, and a mortar injected into the inside is cured before curing. Wrapping a porous sheet or a porous plate having holes that are difficult to flow out, and filling the mortar into the space formed between the outer peripheral surface of the column or the beam and the porous sheet or the porous plate. Repair and reinforcement method for concrete structures characterized by the following. 3. The method for repairing and reinforcing concrete structures according to claim 1, wherein the mortar is a non-shrink mortar.