JP2020172809A - Reinforcement structure and reinforcement method for masonry structure - Google Patents

Abstract

To provide a reinforcement structure and a reinforcement method of a masonry structure capable of suppressing the influence on the appearance to a small extent without any trouble.SOLUTION: The structure reinforces an existing masonry structure 10 formed by stacking masonry materials 12. The structure includes: a non-penetrating vertical hole 16 provided from a top 18 of the masonry structure 10 to a lower portion of the masonry structure 10 or the inside of a foundation thereof; a recess 26 provided in a hole wall 24 below the vertical hole 16; a rod-shaped material 20 inserted through the vertical hole 16 and functioning as a tensioning material or a reinforcement material; a fixed portion 22 joined to a lower portion of the rod-shaped material 20 and arranged below the recess 26; and a solidifying material 28 filled at least in the vertical hole 16 at a position of the recess 26 and burying the fixed portion 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a reinforcement structure and a reinforcement method for a masonry structure, for example, to reinforce a masonry structure for seismic reinforcement by providing a PC steel rod or the like on an existing masonry structure such as a brick wall. It relates to the structure and reinforcement method.

Conventionally, in the seismic reinforcement of existing brick (masonry) buildings, a hole is dug vertically from the top of the brick wall, a PC steel rod is inserted inside, the end is fixed, and prestress is introduced. There is a construction method to improve the structural performance of the brick wall. As a method of fixing the PC steel rod at the lower part of the brick wall by this method, a vertical hole is made vertically downward from the top of the brick wall, and a horizontal hole connected to the vertical hole is dug from the side in the lower part of the brick wall or the foundation concrete. A method of attaching and fixing a fixing plate to the lower end of a PC steel rod (see, for example, Patent Document 1), and a method of digging a vertical hole having a larger diameter from a horizontal hole and attaching and fixing the fixing plate in the vertical hole (see, for example, Patent Document 1). For example, refer to Patent Document 2) and the like have been devised. With these methods, it is necessary to make a large hole on the side surface, which is troublesome and has a problem of affecting the appearance of the building and damaging the cultural property value.

On the other hand, the applicant for this patent is proposing a method of not forming a lateral hole (see Patent Document 3). The method described in Patent Document 3 is to cut the lower end portion of the vertical hole to increase the diameter, and insert a PC steel rod having a fixing portion having a size passing through the vertical hole into the diameter. According to this method, since a large hole is not formed on the side surface, the influence on the appearance of the building can be suppressed to a small extent.

Japanese Unexamined Patent Publication No. 2010-281334 JP-A-2018-178646 Japanese Patent Application No. 2018-233747 (Unpublished at this time)

However, in the above-mentioned conventional method of Patent Document 3, there is a possibility that it takes time and effort to greatly increase the diameter of the lower end portion of the vertical hole. For this reason, there has been a demand for a reinforcing technique that can minimize the influence on the appearance of the building without taking such trouble.

The present invention has been made in view of the above, and an object of the present invention is to provide a reinforcing structure and a reinforcing method for a masonry structure capable of suppressing the influence on the appearance to a small extent without any trouble. ..

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 the existing masonry structure formed by stacking masonry materials. A non-penetrating vertical hole provided from the top of the masonry structure to the lower part of the masonry structure or the inside of the foundation thereof, a recess provided in the hole wall below the vertical hole, and an insertion arrangement in the vertical hole. A rod-shaped material that functions as a tensioning material or a reinforcing material, a fixing portion that is joined to the lower part of the rod-shaped material and is arranged below the recess, and a vertical hole at least at the position of the recess are filled to bury the fixing portion. It is characterized by being provided with a solidifying material.

Further, the method for reinforcing a masonry structure according to the present invention is a method for reinforcing an existing masonry structure formed by stacking masonry materials, and the masonry structure is formed from the top of the masonry structure. A step of drilling a non-penetrating vertical hole in the lower part of an object or the inside of its foundation, a step of forming a recess in the hole wall under the vertical hole, and fixing to the lower part of a rod-shaped material that functions as a tensioning material or a reinforcing material. After joining the parts, the rod-shaped material is inserted into the vertical hole and the fixing part is placed below the recess, and at least the vertical hole at the position of the recess is filled with a solidifying material to bury the fixing part. It is characterized by having a step.

Further, in another method for reinforcing a masonry structure according to the present invention, in the above-described invention, the rod-shaped material functions as a tension material, and the lower portion of the rod-shaped material serves as a fixed end and the upper portion serves as a tension end. It is characterized by further including a step of applying a tension force to the material to apply a compressive force in the vertical direction to the masonry structure.

According to the reinforcement structure of the masonry structure according to the present invention, the structure reinforces the existing masonry structure formed by stacking the masonry materials, and the masonry structure is formed from the top of the masonry structure. A non-penetrating vertical hole provided at the bottom of an object or the inside of its foundation, a recess provided at the hole wall below the vertical hole, and a rod-shaped material that is inserted through the vertical hole and functions as a tensioning material or a reinforcing material. And, since it is provided with a fixing portion joined to the lower part of the rod-shaped material and arranged below the recess, and a solidifying material filled in at least the vertical hole at the position of the recess and burying the fixing portion, the recess is filled. A shear key is formed between the solidified material and the masonry structure, and a large shearing force can be transmitted. Since the compression struts are formed diagonally from the fixing portion toward the shear key, a large fixing strength can be obtained. In addition, the fixing portion can be constructed only by working from above without making a horizontal hole on the side surface. Since no holes are formed on the side surfaces, the effect on the appearance of the masonry structure can be suppressed to a small extent.

Further, according to the method for reinforcing a masonry structure according to the present invention, it is a method for reinforcing an existing masonry structure formed by stacking masonry materials, and masonry is performed from the top of the masonry structure. A step of drilling a non-penetrating vertical hole in the lower part of a structure or the inside of its foundation, a step of forming a recess in the hole wall below the vertical hole, and a lower part of a rod-shaped material that functions as a tensioning material or a reinforcing material. After joining the fixing part to the vertical hole, the rod-shaped material is inserted through the vertical hole and the fixing part is placed below the recess, and at least the vertical hole at the position of the recess is filled with the solidifying material to form the fixing part. Since it is provided with a step of burying, a shear key is formed between the solidifying material filled in the recess and the masonry structure, and a large shearing force can be transmitted. Since the compression struts are formed diagonally from the fixing portion toward the shear key, a large fixing strength can be obtained. In addition, the fixing portion can be constructed only by working from above without making a horizontal hole on the side surface. Since no holes are formed on the side surfaces, the effect on the appearance of the masonry structure can be suppressed to a small extent.

Further, according to another method for reinforcing a masonry structure according to the present invention, the rod-shaped material functions as a tensioning material, and the rod-shaped material is tensioned with the lower portion as a fixed end and the upper portion as a tensioning end. Since the step of applying a force to apply a compressive force in the vertical direction to the masonry structure is further provided, when the compressive force is applied to the masonry structure, the influence on the appearance of the masonry structure is affected. It has the effect of being able to provide a reinforcement method that can be kept small.

FIG. 1 is a front sectional view showing an embodiment of a reinforcing structure and a reinforcing method of a masonry structure according to the present invention. FIG. 2 is a front sectional view showing a modified example of the reinforcing structure and the embodiment of the reinforcing method of the masonry structure according to the present invention. FIG. 3 is a front sectional view showing an example of a sectional shape of the recess.

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 brick wall 10 as shown in FIG. 1 will be described as an example of the masonry structure to be reinforced. The brick wall 10 is a wall body formed by stacking bricks 12 as a masonry material, and is constructed on a concrete foundation provided in the ground (not shown). Brick 12 is a rectangular parallelepiped building material made by baking or compressing clay, shale and mud. Joints 14 made of mortar, grout, or the like are provided between the bricks 12 adjacent to each other on the top, bottom, left, and right. The masonry structure of the present invention is not limited to a brick wall, and may be, for example, a concrete wall in which concrete blocks are stacked as a masonry material, or a wall in which stones or the like are stacked as a masonry material.

Further, in the present embodiment, the case where the rod-shaped material is a PC steel rod (tension material) will be described as an example, but the rod-shaped material of the present invention is not limited to this. For example, it may be a tension material such as a PC steel wire, a stranded wire made of FRP, a rod, or a reinforcing material such as a reinforcing bar.

The reinforcement method of this embodiment is carried out by the construction procedure of steps 1 to 6. The construction contents of each step will be described below.

(Step 1)
First, as shown in FIG. 1, a hole is dug in the vertical direction from the upper end 18 (top) of the brick wall 10 toward the lower end. Hereinafter, this hole will be referred to as a vertical hole. The vertical hole 16 is a non-penetrating hole having a circular cross section, and is a position where the lower part of the brick wall 10 or the lower part of the PC steel rod 20 in the concrete foundation is fixed without penetrating under the brick wall 10 or the concrete foundation (not shown). Punch up to. As will be described later, the hole diameter of the vertical hole 16 is set to be slightly larger than the diameter or the maximum size of the fixing plate 22 (fixing portion) to be joined to the PC steel rod 20. Although not particularly shown, a plurality of vertical holes 16 are formed at intervals along the length direction of the brick wall 10.

(Step 2)
Next, the hole wall 24 below the vertical hole 16 is cut to form a ring-shaped (annular) recess 26 in the hole wall 24. At least one recess 26 is provided above the upper surface of the fixing plate 22. The concave portion 26 may have a ring-shaped concave portion as a whole, and may have a discontinuous portion in the circumferential direction. Further, the shape is not limited to the ring shape, and may be formed spirally with respect to the hole wall 24. A plurality of recesses 26 may be provided at intervals in the vertical direction. The vertical cross section of the recess 26 may have any shape, for example, as shown in FIG. 3, (1) square shape, (2) triangular shape, (3) arbitrary polygonal shape, and (4) round shape in vertical cross-sectional view. , (5) Any curved shape may be used.

(Step 3)
Next, after attaching the fixing plate 22 to the lower end of the PC steel rod 20, the PC steel rod 20 is inserted into the vertical hole 16 from the upper end 18 of the brick wall 10. As described above, the size and shape of the fixing plate 22 are set to be smaller than the diameter of the vertical hole 16 and to be inserted from the upper end 18 of the vertical hole 16. The fixing portion of the present invention is not limited to this, and any fixing portion may be used as long as a fixing head is added to a rod-shaped material such as a PC steel rod. For example, a fixing nut of a type screwed into a PC steel rod may be used, or a steel plate or the like may be provided on the fixing nut. A fixing plate may be attached to the tension material or the reinforcing material by welding, friction welding, or screw joining, or the tension material or the reinforcing material itself may be molded to form a head. Further, as shown in FIG. 2, a plurality of fixing plates 22 may be provided at the lower end portion of the PC steel rod 20 at intervals in the vertical direction. In this case, it is necessary to set so that there is at least one recess 26 above the fixing plate 22 arranged at the uppermost portion.

(Step 4)
Subsequently, the PC steel rod 20 is inserted until the fixing plate 22 fits below the recess 26 of the vertical hole 16. It is preferable to secure a constant vertical distance between the recess 26 and the fixing plate 22. This is because a compression strut (bundle) is formed between the fixing plate 22 and the recess 26 to transmit the fixing force.

(Step 5)
Next, the solidifying material 28 is filled in the vertical holes 16. It is not necessary to fill the entire length of the vertical hole 16 with the solidifying material 28, but at least the range from the periphery of the fixing plate 22 serving as the fixing portion of the PC steel rod 20 to the recess 26 is always filled. As the solidifying material 30, it is desirable to use a material having a higher compressive strength than the existing brick wall 10. The solidifying material 28 can transmit the force acting from the fixing portion of the PC steel rod 20 to the ring-shaped recess 26 of the hole wall 24, such as an inorganic material such as mortar, grout, or concrete, or an organic material such as epoxy resin. Anything is fine.

(Step 6)
Next, after the solidifying material 28 is solidified, tension is applied to the PC steel rod 20 with the lower end of the PC steel rod 20 as the fixed end and the upper end as the tension end, and the upper end of the PC steel rod 20 is the upper end of the brick wall 10. It is fixed to a fixing plate or the like (not shown) provided in 18. As a result, a compressive force in the vertical direction is applied between the upper end 18 of the brick wall 10 and the lower fixing plate 22 to reinforce the brick wall 10, and the reinforcing structure 100 of the masonry structure according to the present embodiment is used. Can be obtained.

According to this reinforcing method, when the solidifying material 28 filled in the ring-shaped recess 26 is solidified, a ring-shaped shear key is formed between the solidifying material 28 and the brick wall 10, and a large shearing force can be transmitted. A compression strut is formed diagonally from the fixing portion of the PC steel rod 20 toward the ring-shaped shear key, and a large fixing strength is exhibited.

Further, according to this reinforcing method, in the method of reinforcing the brick wall 10 in which the PC steel rod 20 is inserted in the vertical direction, a large fixing strength can be obtained only by drilling from above without performing drilling work from the side surface. It is possible to form a lower fixing portion to have. Therefore, almost no excavation amount is generated.

Further, since the side hole of the brick wall 10 is not formed, the influence on the appearance of the brick wall 10 is small or almost nonexistent. Therefore, according to the present embodiment, it is possible to reinforce the brick wall 10 while suppressing the influence on the appearance to a small extent with relatively little effort. Therefore, it is possible to prevent the brick wall 10 from deteriorating in value as a cultural property.

Further, since it is not necessary to greatly increase the diameter of the lower portion of the vertical hole 16, the cutting work for forming the ring-shaped recess 26 can be lightened, and the cost can be reduced, the construction period can be shortened, and the noise can be reduced.

As described above, according to the reinforcement structure of the masonry structure according to the present invention, it is a structure for reinforcing the existing masonry structure formed by stacking masonry materials, and is a structure for reinforcing the existing masonry structure. A non-penetrating vertical hole provided from the top to the lower part of the masonry structure or the inside of the foundation thereof, a recess provided in the hole wall below the vertical hole, and a tension material or reinforcement arranged through the vertical hole. It includes a rod-shaped material that functions as a material, a fixing portion that is joined to the lower part of the rod-shaped material and is arranged below the recess, and a solidifying material that is filled in at least a vertical hole at the position of the recess and embeds the fixing portion. Therefore, a shear key is formed between the solidifying material filled in the recess and the masonry structure, and a large shearing force can be transmitted. Since the compression struts are formed diagonally from the fixing portion toward the shear key, a large fixing strength can be obtained. In addition, the fixing portion can be constructed only by working from above without making a horizontal hole on the side surface. Since no holes are formed on the side surfaces, the influence on the appearance of the masonry structure can be suppressed to a small extent.

Further, according to the method for reinforcing a masonry structure according to the present invention, it is a method for reinforcing an existing masonry structure formed by stacking masonry materials, and masonry is performed from the top of the masonry structure. A step of drilling a non-penetrating vertical hole in the lower part of a structure or the inside of its foundation, a step of forming a recess in the hole wall below the vertical hole, and a lower part of a rod-shaped material that functions as a tensioning material or a reinforcing material. After joining the fixing part to the vertical hole, the rod-shaped material is inserted through the vertical hole and the fixing part is placed below the recess, and at least the vertical hole at the position of the recess is filled with the solidifying material to form the fixing part. Since it is provided with a step of burying, a shear key is formed between the solidifying material filled in the recess and the masonry structure, and a large shearing force can be transmitted. Since the compression struts are formed diagonally from the fixing portion toward the shear key, a large fixing strength can be obtained. In addition, the fixing portion can be constructed only by working from above without making a horizontal hole on the side surface. Since no holes are formed on the side surfaces, the influence on the appearance of the masonry structure can be suppressed to a small extent.

Further, according to another method for reinforcing a masonry structure according to the present invention, the rod-shaped material functions as a tensioning material, and the rod-shaped material is tensioned with the lower portion as a fixed end and the upper portion as a tensioning end. Since the step of applying a force to apply a compressive force in the vertical direction to the masonry structure is further provided, when the compressive force is applied to the masonry structure, the influence on the appearance of the masonry structure is affected. It is possible to provide a reinforcement method that can be kept small.

As described above, the reinforcing structure and the reinforcing method of the masonry structure according to the present invention are earthquake-resistant by introducing prestress into an existing masonry structure such as a brick wall with a PC steel rod or the like. It is useful for reinforcement and for reinforcing by inserting reinforcing bars into the existing masonry structure without any trouble, especially for the appearance of the existing masonry structure. It is suitable for seismic reinforcement with a small effect.

10 Brick wall (masonry structure)
12 bricks (masonry)
14 joints 16 vertical holes 18 upper end (top)
20 PC steel rod (rod-shaped material)
22 Fixing plate (fixing part)
24 Hole wall 26 Recess 28 Solidifying material 100 Reinforcement structure of masonry structure

Claims (3)

It is a structure that reinforces the existing masonry structure made by stacking masonry materials.
Non-penetrating vertical holes provided from the top of the masonry structure to the lower part of the masonry structure or the inside of the foundation thereof, recesses provided in the hole wall below the vertical holes, and insertion arrangement in the vertical holes. A rod-shaped material that functions as a tensioning material or a reinforcing material, a fixing portion that is joined to the lower part of the rod-shaped material and is arranged below the recess, and a vertical hole at least at the position of the recess are filled to bury the fixing portion. A reinforced structure of a masonry structure characterized by being provided with a solidifying material. It is a method of reinforcing an existing masonry structure made by stacking masonry materials.
A step of drilling a non-penetrating vertical hole from the top of the masonry structure to the bottom of the masonry structure or the inside of its foundation,
The step of forming a recess in the hole wall below the vertical hole,
After joining the fixing part to the lower part of the rod-shaped material that functions as a tensioning material or a reinforcing material, the step of inserting the rod-shaped material through the vertical hole and arranging the fixing part below the recess.
A method for reinforcing a masonry structure, which comprises at least a step of filling a vertical hole at a concave portion with a solidifying material and burying a fixing portion. The rod-shaped material functions as a tension material, and a step of applying a tension force to the rod-shaped material with the lower part of the rod-shaped material as a fixed end and the upper part as a tensioning end to apply a compressive force in the vertical direction to the masonry structure. The method for reinforcing a masonry structure according to claim 2, further comprising.

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