JP2020165217A - Reinforcement structure and reinforcing method of masonry construction structure - Google Patents

Abstract

To provide a reinforcement structure and a reinforcing method of a masonry construction structure capable of recovering strength to that before occurrence of cracking without affecting an exterior appearance.SOLUTION: A structure reinforcing cracking 16 generated in an existing masonry construction structure 10 formed by stacking masonry materials 12 comprises: a groove 22 formed in a joint 18A crossing the cracking 16 and extending in a direction crossing the cracking 16; a reinforcing material 24 disposed in the groove 22; and a solidification material 26 filled in the groove 22 in a state of burying the reinforcing material 24.SELECTED DRAWING: Figure 1

Description

The present invention relates to a reinforcing structure and a method for reinforcing a masonry structure, and relates to a reinforcing structure and a method for reinforcing an existing masonry structure such as a brick wall to reinforce or repair cracks in the existing masonry structure. is there.

Conventionally, in masonry structures such as brick walls, cracks may occur around openings due to earthquakes or deterioration over time, and repairs may be required. As a method of repairing cracks, there is a method of injecting epoxy resin or cement slurry into the cracks. However, in historic buildings, epoxy resins are difficult to use due to problems such as aging, and cement slurries have problems in filling cracks.

In order to restore the cracked masonry to its original yield strength, it is necessary to return it to the same strength as the base metal by injecting it into the crack, and to prevent future cracks, it is necessary to make it even stronger. is there. However, it is difficult to obtain a sufficient repair effect, that is, structural performance equal to or higher than that before the crack, and it is difficult to prevent the damage from spreading after the repair.

On the other hand, as a conventional technique, a method of embedding an aramid rod in a brick joint to reinforce it is known (see, for example, Patent Document 1). However, since the aramid rod has low rigidity as a reinforcing material, it allows a large deformation in order to exert an effect in crack reinforcement, and there is a risk that the damage to the building will be large. Moreover, since the strength is low, local cracks cannot be sufficiently reinforced.

Japanese Unexamined Patent Publication No. 2012-97471

The present invention has been made in view of the above, and provides a reinforcing structure and a reinforcing method for a masonry structure that can restore the strength before cracking without affecting the appearance. The purpose.

In order to solve the above-mentioned problems and achieve the object, the reinforcing structure of the masonry structure according to the present invention is a structure for reinforcing cracks generated in the existing masonry structure formed by stacking masonry materials. It is provided with a groove formed at a joint intersecting the crack and extending in a direction intersecting the crack, a reinforcing material arranged in the groove, and a solidifying material filled in the groove in a manner of burying the reinforcing material. It is characterized by.

Further, in the reinforcing structure of the other masonry structure according to the present invention, in the above-described invention, the joints are misaligned on both sides of the crack, and the groove is formed at one of the joints on both sides. The stiffener is inserted and placed in the groove and the hole drilled in the masonry near the joint on the other side, and the solidifying material is filled in the groove and the hole in a manner of burying the stiffener. It is a feature.

Further, the method for reinforcing a masonry structure according to the present invention is a method for reinforcing cracks generated in an existing masonry structure formed by stacking masonry materials, and is used for joints intersecting with the cracks. It is characterized by including a step of forming a groove extending in a direction intersecting with a crack, a step of arranging a reinforcing material in the groove, and a step of filling the groove with a solidifying material in a manner of burying the reinforcing material.

Further, in the other method for reinforcing a masonry structure according to the present invention, in the above-described invention, when the joints are misaligned on both sides of the crack, a groove is formed in one of the joints on both sides. The step of forming, the step of drilling a hole in the masonry material near the joint on the other side from the formed groove, the step of inserting and arranging the reinforcing material in the groove and the hole, and the groove and the mode of burying the reinforcing material. It is characterized by including a step of filling the pores with a solidifying material.

According to the reinforcing structure of the masonry structure according to the present invention, it is a structure for reinforcing the cracks generated in the existing masonry structure formed by stacking the masonry materials, and is formed at the joints intersecting the cracks. When a masonry structure is cracked, it is provided with a groove extending in a direction intersecting the crack, a reinforcing material arranged in the groove, and a solidifying material filled in the groove in a manner of burying the reinforcing material. , It has the effect that it can be restored to the strength before the occurrence of cracks without affecting the appearance.

Further, according to the reinforcing structure of another masonry structure according to the present invention, the joints are misaligned on both sides of the crack, and the groove is formed at one of the joints on both sides to reinforce the joint. The material is inserted and placed in the groove and the hole drilled in the masonry near the joint on the other side, and the solidifying material is filled in the groove and hole in the manner of burying the reinforcing material, so that both sides of the crack. Even if there is a step in the joint, the strength can be restored to the strength before the crack occurred without affecting the appearance.

Further, according to the method for reinforcing a masonry structure according to the present invention, it is a method for reinforcing a crack generated in an existing masonry structure formed by stacking masonry materials, and is used at a joint intersecting the crack. On the other hand, since it includes a step of forming a groove extending in a direction intersecting the crack, a step of arranging a reinforcing material in the groove, and a step of filling the groove with a solidifying material in a manner of burying the reinforcing material, masonry construction is provided. When a structure is cracked, it has the effect of being able to recover the strength before the crack occurred without affecting the appearance.

Further, according to another method for reinforcing a masonry structure according to the present invention, when the joints are misaligned on both sides of the crack, a step of forming a groove in one of the joints on both sides. From the formed groove, a step of drilling a hole in the masonry material near the joint on the other side, a step of inserting and arranging a reinforcing material in the groove and the hole, and a step of burying the reinforcing material solidify into the groove and the hole. Since it is provided with a step of filling the material, even if there is a step on both sides of the crack, the strength before the crack can be restored without affecting the appearance.

FIG. 1 is a view showing an embodiment of a reinforcing structure and a reinforcing method of a masonry structure according to the present invention, (1) is a front view, and (2) is a side sectional view. FIG. 2 is a perspective view showing a strip-shaped reinforcing material. FIG. 3 is an explanatory view of a reinforcing method when there is a vertical step between the left and right horizontal joints of the crack, (1) is a horizontal sectional view, and (2) is a front view. 4A and 4B are explanatory views of an experiment conducted for verifying the effect of the present invention, in which FIG. 4 is a horizontal sectional view, FIG. 4 is a front view, and FIG. 4 is a side view. FIG. 5 is a graph showing the experimental results.

Hereinafter, embodiments of the reinforcing structure and the reinforcing method of the masonry structure according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

In the present embodiment, the masonry wall 10 as shown in FIG. 1 will be described as an example of the masonry structure to be reinforced. The masonry wall 10 is a wall body formed by stacking rectangular parallelepiped masonry members 12, and has an opening 14 on the lower left side. A crack 16 is formed in the masonry wall 10 from the corner of the opening 14 in the upper right direction. Joints 18 made of mortar, grout, etc. are provided between the masonry materials 12 adjacent to each other on the top, bottom, left, and right. The joint 18 is composed of a horizontal joint 18A extending in the horizontal direction and a vertical joint 18B extending in the vertical direction. The masonry material 12 is composed of, for example, bricks, concrete blocks, stone materials, and the like. Examples of the masonry wall 10 include a brick wall in which bricks are piled up, a concrete wall in which concrete blocks are piled up, and a wall in which stone materials are piled up.

(Embodiment 1)
First, Embodiment 1 of the present invention will be described.
The reinforcement method of the first embodiment is performed by the following construction procedure.

First, as shown in FIG. 1, an injection material 20 such as an epoxy resin or cement slurry is injected into the crack 16 generated in the masonry wall 10.

After the injection material 20 is hardened, the horizontal joint 18A of the portion crossing the crack 16 generated in the masonry wall 10 is cut from the wall surface and dug in a groove shape. As a result, a groove 22 extending in the direction intersecting the crack 16 is formed in the horizontal joint 18A. The groove 22 is formed so as to cross the crack 16 and have a sufficient length on both sides of the crack 16.

Next, a rod-shaped or strip-shaped reinforcing material 24 is inserted into the groove 22, and then a filler 26 (solidifying material) such as mortar or grout is filled in the groove 22 to bury the reinforcing material 24. The reinforcing material 24 is embedded in the horizontal joint 18A that crosses the crack 16 or the position where the crack 16 is likely to develop in the future, crossing the extending direction of the crack 16 and taking a fixing length L of a sufficient length on both sides from the crack 16. .. The reinforcing material 24 shall be embedded only in the horizontal joint 18A and not in the vertical joint 18B. For the fixing length L, for example, it is desirable to secure about 40d or more (d is the diameter or thickness of the reinforcing member 24). The reinforcing material 24 has a size that fits within the horizontal joint 18A. Since the joint width of a brick wall is usually about 10 mm, the diameter of the rod-shaped reinforcing material 24 is 10 mm or less, and the thickness of the strip-shaped reinforcing material 24 is 10 mm or less. Further, it is desirable that the depth of the groove 22 is at least twice the width of the groove 22.

The reinforcing material 24 is preferably made of a material that does not easily rust. For example, (1) a stainless steel rod-shaped reinforcing material (stainless steel reinforcing bar, stainless steel shredded bolt) having an uneven surface, and (2) a resin-coated reinforcing bar. , (3) Plated shredded bolts, (4) Stainless steel strip-shaped reinforcing material (flat bar) with a plurality of holes to increase the adhesion strength and the like can be used. FIG. 2 shows an example of a strip-shaped reinforcing material. As shown in this figure, a plurality of holes 28 are provided at intervals along the longitudinal direction of the reinforcing member 24. When the strip-shaped reinforcing member 24 is provided in the groove 22, the longitudinal direction of the reinforcing member 24 and the extending direction of the horizontal joint 18A are made to coincide with each other, and the through hole 28 is provided in the groove 22 in the vertical direction. ..

According to the first embodiment, when a crack 16 occurs in the vicinity of the opening 14 of the masonry wall 10, the strength before the crack can be restored without affecting the appearance. In addition, by increasing the amount of reinforcement, it is possible to prevent the recurrence and development of cracks in the future. By applying it to masonry walls before the occurrence of cracks, it is possible to prevent the occurrence and progression of cracks.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described.
As shown in FIG. 3, the second embodiment is a reinforcing method when the deformation is large on both sides of the crack 16 and the horizontal joint 18A of the portion crossing the crack 16 is displaced (upper and lower steps). The second embodiment is carried out by the following construction procedure.

First, with respect to the horizontal joint 18A on one side (left side of the figure) of the crack 16, a groove 22 is dug in the same manner as in the first embodiment, and the other side of the crack 16 (right side of the figure) is drilled from the groove 22. The masonry material 12 is drilled to form a hole 30. It is desirable that the depth a of the groove 22 is at least twice the width of the groove 22 (for example, about 40 mm). Next, the reinforcing member 24 is inserted into the hole 30 from the side of the groove 22. As described above, it is desirable that the length to be inserted is 40 d or more in the groove 22 and 40 d or more in the hole 30 with the crack 16 interposed therebetween. After that, the inside of the hole 30 and the inside of the groove 22 are filled with a filler 26 (solidifying material) such as mortar or grout.

According to the second embodiment, when the deformation is large on both sides of the crack 16 and the horizontal joint 18A of the portion crossing the crack 16 is misaligned (for example, a vertical step), the crack does not affect the appearance. It can be restored to the strength before the outbreak. In addition, by increasing the amount of reinforcement, it is possible to prevent the recurrence and development of cracks in the future. By applying it to masonry walls before the occurrence of cracks, it is possible to prevent the occurrence and progression of cracks.

The reinforcing method of the second embodiment can be applied even when the horizontal joints 18A on both sides of the crack 16 are not misaligned. For example, it can be applied when the joint width of the horizontal joint 18A is small.

(Verification of the effect of the present invention)
Experiments were conducted to verify the effect of the present invention. The contents and results will be described below.

In this experiment, as shown in Fig. 4, the brick masonry was divided into two parts on the left and right, and grout was injected into a gap of 5 mm assuming cracks to repair the cracks, and a small-diameter stainless steel bar was added to one horizontal joint. (D6) was embedded and reinforced, and a three-point bending type force was applied to investigate the reinforcing effect. The test bodies were the following four bodies.

-Comparative example 1: A masonry made of one piece without cracks-Comparative example 2: A product in which only grout is injected into cracks-Example 1: Grout injection into cracks and stainless steel streaks D6 in one horizontal joint -Example 2: Grout injection into cracks and four stainless steel bars D6 embedded in one horizontal joint.

FIG. 5 shows the relationship between the load obtained by the experiment and the displacement. As shown in this figure, the proof stress of the one in which the stainless steel bars are embedded (Examples 1 and 2) is greatly increased as compared with the case of only the crack injection repair (Comparative Example 2), and the more the stainless steel bars are, the greater the proof stress is. became. In this experiment, the stainless steel bar D6 (2 pieces) exerted a yield strength close to that of the original non-cracked brick masonry, and the stainless steel bar D6 (4 pieces) greatly exceeded the yield strength of the original crackless brick masonry. It was. From the results of this experiment, it can be seen that the present invention exerts a great effect on repairing and reinforcing cracks.

As described above, according to the reinforcing structure of the masonry structure according to the present invention, the structure reinforces the cracks generated in the existing masonry structure formed by stacking the masonry materials. A masonry structure is provided with a groove formed at an intersecting joint and extending in a direction intersecting a crack, a reinforcing material arranged in the groove, and a solidifying material filled in the groove in a manner of burying the reinforcing material. When a crack occurs, the strength before the crack can be restored without affecting the appearance.

Further, according to the reinforcing structure of another masonry structure according to the present invention, the joints are misaligned on both sides of the crack, and the groove is formed at one of the joints on both sides to reinforce the joint. The material is inserted and placed in the groove and the hole drilled in the masonry near the joint on the other side, and the solidifying material is filled in the groove and hole in the manner of burying the reinforcing material, so that both sides of the crack. Even if there is a step in the joint, it can be restored to the strength before the crack occurred without affecting the appearance.

Further, according to the method for reinforcing a masonry structure according to the present invention, it is a method for reinforcing a crack generated in an existing masonry structure formed by stacking masonry materials, and is used at a joint intersecting the crack. On the other hand, since it includes a step of forming a groove extending in a direction intersecting the crack, a step of arranging a reinforcing material in the groove, and a step of filling the groove with a solidifying material in a manner of burying the reinforcing material, masonry construction is provided. When a structure is cracked, it can be restored to the strength before the crack occurred without affecting the appearance.

Further, according to another method for reinforcing a masonry structure according to the present invention, when the joints are misaligned on both sides of the crack, a step of forming a groove in one of the joints on both sides. From the formed groove, a step of drilling a hole in the masonry material near the joint on the other side, a step of inserting and arranging a reinforcing material in the groove and the hole, and a step of burying the reinforcing material solidify into the groove and the hole. Since it is provided with a step of filling the material, even if there are steps on both sides of the crack, the strength before the crack can be restored without affecting the appearance.

As described above, the reinforcing structure and the reinforcing method of the masonry structure according to the present invention are useful for repairing and reinforcing cracks generated in the masonry structure such as an existing brick wall. It is suitable for restoring the strength before cracking without affecting the appearance.

10 Masonry wall (masonry structure)
12 Masonry 14 Opening 16 Cracks 18 Joints 18A Horizontal joints 18B Vertical joints 20 Injection material 22 Grooves 24 Reinforcing material 26 Filling material (solidifying material)
28,30 holes

Claims (4)

It is a structure that reinforces cracks in existing masonry structures made by stacking masonry materials.
It is characterized by including a groove formed at a joint intersecting with a crack and extending in a direction intersecting the crack, a reinforcing material arranged in the groove, and a solidifying material filled in the groove in a manner of burying the reinforcing material. Reinforcing structure for masonry structures. The joints were misaligned on both sides of the crack, grooves were formed in one of the joints on both sides, and reinforcements were drilled in the groove and the masonry near the other joint. The reinforcing structure of a masonry structure according to claim 1, wherein the solidifying material is inserted into and arranged in a hole, and the solidifying material is filled in the groove and the hole in a manner of burying the reinforcing material. It is a method to reinforce cracks in existing masonry structures made by stacking masonry materials.
For the joint that intersects the crack, a step of forming a groove extending in the direction intersecting the crack, a step of arranging a reinforcing material in the groove, and a step of filling the groove with a solidifying material in a manner of burying the reinforcing material. A method of reinforcing a masonry structure, which is characterized by being provided. When the joints are misaligned on both sides of the crack, the step of forming a groove in one of the joints on both sides and the hole from the formed groove to the masonry material near the joint on the other side. The set according to claim 3, further comprising a step of drilling, a step of inserting and arranging a reinforcing material in the groove and the hole, and a step of filling the groove and the hole with a solidifying material in a manner of burying the reinforcing material. How to reinforce masonry structures.

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