JP2021139103A - Stone wall or masonry wall reinforcing method and reinforcing structure - Google Patents

Abstract

To provide a stone wall or masonry wall reinforcing method and reinforcing structure, which can exert a sufficient aseismatic reinforcing property by securely forming a cylindrical solidified layer body that is a uniform and high-quality reinforcing material without including an excavation process (without forming a borehole) even if a cobble stone layer consists of small gravels mixed with fine sediment.SOLUTION: A stone wall or masonry wall reinforcing method includes: a step to insert and position a hollow rod-like reinforcing member 1 on which a plurality of discharge holes 1a are provided in an axial direction into a joint part of a stone mounting layer 21 and remove a sediment component 13 on a circumference of the reinforcing member 1 by a water injecting means or an air blowing means that make use of the discharge holes 1a; a step to slide and set a cylindrical water permeable sheet 2 to the inside of the reinforcing member 1; and a step to form a cylindrical solidified layer body 9 to reinforce on a circumference of the reinforcing member 1 by injecting a solidification material 8 into the water permeable sheet 2 and oozing substantially uniformly the solidification material 8 oozed from the water permeable sheet 2 to the inside of the reinforcing member 1 to the outside through the discharge holes 1a.SELECTED DRAWING: Figure 3

Description

The present invention belongs to the technical field of stone wall or masonry wall reinforcement method and reinforcement structure, and more specifically, preserves the stone wall or masonry wall which is the outer wall part of a building that is historically valuable and has high preservation value, and the inside thereof. Reinforcement technology that achieves the purpose of preservation and reproduction by improving (behind).

In recent years, for example, the techniques according to Patent Documents 1 to 3 are known as slope stabilizers for stabilizing the ground on a slope where the ground of the surface layer may collapse or fall off. These techniques are common inventions in which an injection pipe is placed in a hole excavated in the ground and a reinforcing material is created by an injection material pressure-injected into the injection pipe, and the bearing resistance of the reinforcing material against a pulling force. Some effects such as being able to increase the force are recognized.

However, when the technique according to Patent Documents 1 to 3 is applied to a technique for reinforcing a stone wall or a masonry wall, it is not preferable because a hole is formed including an excavation step, which impairs the appearance. This is especially true for stone walls or masonry walls that are historically valuable and have high preservation value.
On the other hand, Patent Document 4 is a technique for reinforcing a masonry wall without including an excavation process (without forming a hole), and is attracting attention.

As shown in Figs. On the other hand, by placing a reinforcing material at each of a plurality of joints where the plurality of Machi stones abut each other and filling the periphery of the reinforcing material with a grout material, the reinforcing material is applied to the sloped ground. A method of reinforcing a masonry wall that is fixed and the reinforcing material is placed to push a plurality of the stones adjacent to the outer periphery of the joint portion to the outside to mutually restrain the stones. (See the description of claim 2 and the like).
Then, in paragraph [0032] of the same document 4, as a method of filling the grout material around the reinforcing material, for example, a mortar having a predetermined composition of fluidity is applied from the front side of the masonry wall to the periphery of the reinforcing material. A method of press-fitting using a pump (first method), or a method of applying a grout material to the outer peripheral surface of the reinforcing material in advance and placing it together with the reinforcing material (second method). Further, a method in which a supply passage for the grout material is formed inside or outside the reinforcing material, and after the reinforcing material is placed, the grout material is filled around the reinforcing material via the supply passage (third method). ) Can be adopted.

Japanese Patent No. 6259750 Japanese Patent No. 6322542 Japanese Patent No. 6322543 Japanese Patent No. 4316939

Although the invention according to Patent Document 4 has an advantage that the masonry wall can be reinforced without including the excavation step, there is a problem in the method of filling the grout material.
That is, when filling a portion having a large void such as the Kuriishi layer, the mortar inevitably flows down in the direction of gravity at the time of press-fitting because it has fluidity in the first method, and is uniformly around the reinforcing material. There is a problem that a solidified body cannot be formed. In the second method, it is unclear how it can be realized, and even if it can be realized, the effect is ambiguous and there is a problem that the certainty is clearly poor. In the third method, a large amount of grout material is discharged from the passage (hole) near the supply port, the grout material does not reach the sloped ground in the back, and a non-uniform reinforcing material is formed. There is a problem in quality and it is not possible to demonstrate sufficient seismic retrofitting performance.

Further, the chestnut stone layer is not always composed of coarse stones such as chestnut stones, but may be composed of rubble mixed with fine earth and sand. In that case, there is also a problem that the injection material such as grout material cannot be uniformly filled in the Kuriishi layer.

Therefore, the present invention has been devised in view of the above-mentioned problems of the background technology, and the purpose of the present invention is to provide uniform and high-quality reinforcement without including an excavation process (no drilling is formed). It is an object of the present invention to provide a reinforcing method and a reinforcing structure for a stone wall or a masonry wall, which can exhibit sufficient seismic retrofitting performance by surely forming a tubular solidified layer body which is a material.
Further, in the present invention, even when the chestnut stone layer is composed of earth and sand components such as stone gravel mixed with fine earth and sand, the tubular solidified layer which is a uniform and high quality reinforcing material does not include an excavation process. It is an object of the present invention to provide a reinforcing method and a reinforcing structure of a stone wall or a masonry wall, which can exhibit sufficient seismic retrofitting performance by surely forming a body.

As a means for solving the above problems, the method for reinforcing a stone wall or a masonry wall according to the invention according to claim 1 is a method for reinforcing a stone wall or a masonry wall.
A hollow rod-shaped reinforcing member provided with a plurality of discharge holes in the axial direction is inserted into the joint portion of the stone layer for positioning, and the hollow rod-shaped reinforcing member is positioned by a water injection means or an air blow means using the discharge holes. The process of removing the earth and sand components on the outer circumference and
A step of sliding and setting a cylindrical water-permeable sheet inside the hollow rod-shaped reinforcing member, and
The solidifying material is injected into the tubular water-permeable sheet, and the solidifying material that has exuded from the water-permeable sheet to the inside of the hollow rod-shaped reinforcing member is exuded substantially evenly to the outside through the discharge holes. The process of forming a tubular solidified layer on the outer circumference of the hollow rod-shaped reinforcing member to reinforce it,
It is characterized by having.

According to the second aspect of the present invention, in the method for reinforcing a stone wall or a masonry wall according to the first aspect, the hollow rod-shaped reinforcing member exists at its inner end via a chestnut stone layer behind a stone-building layer. It is characterized in that positioning is performed by fixing to the fixing layer, and the tubular solidified layer body is formed on the chestnut stone layer to reinforce it.

According to the third aspect of the present invention, in the method for reinforcing a stone wall or a masonry wall according to the first or second aspect, the discharge hole of the hollow rod-shaped reinforcing member is opened in the upper half portion when the solidifying material is injected. It is characterized in that it is provided as follows.

The invention according to claim 4 is the method for reinforcing a stone wall or a masonry wall according to any one of claims 1 to 3, in which the solidifying material is injected and then fixed to the base end portion of the hollow rod-shaped reinforcing member. A plate is provided to support the stone wall or the masonry wall.

The reinforcing structure of the stone wall or the masonry wall according to the invention according to claim 5 is
A hollow rod-shaped reinforcing member with a cylindrical permeable sheet is positioned behind the stone layer.
The hollow rod-shaped reinforcing member is provided with a plurality of discharge holes in the axial direction, and the solidifying material discharged from the discharge holes through the hollow portion of the cylindrical water-permeable sheet exudes substantially evenly to the outside and is solidified. As a result, a tubular solidified layer is formed on the outer periphery of the hollow rod-shaped reinforcing member to be reinforced.

According to the reinforcing method and the reinforcing structure of the stone wall or the masonry wall according to the present invention, the following effects are obtained.
(1) A stone wall or masonry that exhibits sufficient seismic retrofitting performance by reliably forming a tubular solidified layer that is a uniform and high-quality reinforcing material without including the excavation process (no drilling is formed). The wall can be realized (regenerated).
In addition, even if the chestnut stone layer is composed of earth and sand components such as stone gravel mixed with fine earth and sand, the tubular solidified layer, which is a uniform and high-quality reinforcing material, is surely obtained without including the excavation process. By forming it, it is possible to realize a stone wall or a masonry wall that exhibits sufficient seismic retrofitting performance.
(2) Since it does not include an excavation process, it has the advantage of preserving the appearance, and preserves the stone wall or masonry wall, which is the outer wall part of a building that is historically valuable and has a high preservation value, and improves the inside (behind) of it. The purpose of preservation / reproduction can be achieved.

It is explanatory drawing which showed the construction situation of the reinforcement construction method of the stone wall or the masonry wall which concerns on this invention. It is a front view (left side view) of FIG. It is a vertical cross-sectional view which roughly showed the reinforcement construction method and the reinforcement structure of the stone wall or the masonry wall which concerns on this invention. It is a front view (left side view) of FIG. A is an overall view showing a hollow rod-shaped reinforcing member having a cylindrical water permeable sheet according to the present invention, B is a front view showing a hollow rod-shaped reinforcing member, and C is a tubular water permeable member. It is a front view which showed the sex sheet. FIG. 5A is an enlarged cross-sectional view taken along the line XX of FIG. 5A. A is an enlarged cross-sectional view taken along the line AA of the hollow rod-shaped reinforcing member of FIG. 5B, and B is an enlarged cross-sectional view taken along the line BB. FIG. 5C is an enlarged cross-sectional view of the tubular water permeable sheet of FIG. 5C.

Next, the reinforcing method and the reinforcing structure of the stone wall or the masonry wall according to the present invention will be described with reference to the drawings.

1 to 8 show an example of a reinforcing method and a reinforcing structure of the stone wall 20 according to the present invention.
The reinforcement method of the stone wall 20 is performed by inserting a hollow rod-shaped reinforcing member 1 provided with a plurality of discharge holes 1a in the axial direction into the joint portion of the stone layer 21 and positioning the stone wall 20, and using the discharge holes 1a. A step of removing earth and sand components 13 such as stone gravel on the outer periphery of the hollow rod-shaped reinforcing member 1 by a water injection means or an air blow means (see FIGS. 1 and 2).
The step of sliding and setting the tubular water permeable sheet 2 inside the hollow rod-shaped reinforcing member 1, and the step of injecting the solidifying material 8 into the tubular water permeable sheet 2 and using the water permeable sheet 2 to the above. By allowing the solidifying material 8 that has exuded to the inside of the hollow rod-shaped reinforcing member 1 to seep out substantially evenly to the outside through the discharge hole 1a, a tubular solidified layer 9 is formed on the outer periphery of the hollow rod-shaped reinforcing member 1. It has a step of reinforcing (see FIGS. 3 and 4).

In this embodiment, the hollow rod-shaped reinforcing member 1 has a cement, grout, or the like on the anchoring layer 23 such as a ground that exists via the chestnut stone layer 22 behind the stone-building layer (stone) 21 at the inner end thereof. Positioning is performed by fixing with the fixing material 12 of the above, and the tubular solidified layer 9 is formed on the Kuriishi layer 22 to be reinforced.
As the solidifying material 8, urethane foam is used in this embodiment, but foam grout can also be used. However, in stone walls 20 and the like, which are important cultural properties, if the chestnut stone 22 and the solidifying material 8 are fixed, the value as a cultural property is lost. Therefore, the chestnut stone 22 can be fixed by filling the gap of the chestnut stone layer 22 and easily. Urethane foam that can be separated is desirable.

Further, as shown in FIGS. 5B and 7A and 7B, the hollow rod-shaped reinforcing member 1 is implemented by a hollow porous tube made of a thick hard metal or the like. In this embodiment, as an example, a steel pipe having an inner diameter of 13 mm, an outer diameter of 28.5 mm, and a total length of 2800 mm is used. A drilling bit (lost bit) 7 is rotatably connected to the back end portion via a rod ring or the like.
On the peripheral wall of the intermediate portion (corresponding to the region of the chestnut stone layer 22) of the hollow rod-shaped reinforcing member 1, a discharge hole 1a (about φ5 to 8 mm in this embodiment) that communicates inside and outside over a length of 1500 mm in the axial direction is provided. , A large number of rows (2 rows in this embodiment) are provided at a predetermined pitch in the axial direction (37.5 mm pitch in this embodiment) at predetermined intervals in the circumferential direction. Specifically, as shown in FIGS. 7A and 7B, the two rows are provided at two locations symmetrically at positions on both the left and right sides of the vertical line when viewed in cross section, and the solidifying material is provided. The structure is such that 8 can be equally discharged diagonally upward.

The size of the discharge hole 1a is preferably about φ5 to 8 mm as described above. In this embodiment, the diameter on the front side (stone 21) side where the injection port is close and the discharge amount of the solidifying material 8 tends to be large is small φ5 mm (see FIG. 7A), and the discharge amount of the solidifying material 8 is far from the injection port. The diameter on the back side (fixing layer 23) is large (see FIG. 7B), and the pitch (hole spacing) is shortened toward the back side (for example, 25 mm pitch) to the outside. The discharge amount of the above is adjusted so as to be substantially uniform from the front side to the back side, and the tubular solidified layer 9 formed in the Kuriishi layer 22 is devised so as to have an even and well-balanced shape.
Of course, the diameter, arrangement interval, and number of holes of the discharge holes 1a are not limited to these, and are appropriately designed according to the structural design on the premise that the solidifying material 8 can be efficiently discharged and diffused into the Kuriishi layer 22. It can be changed.

As shown in FIGS. 5C and 8, the tubular water-permeable sheet 2 has a thickness of 0.2 mm, an outer diameter (φ) of 17.8 mm, and a length so that it can be installed in the hollow rod-shaped reinforcing member 1. It is manufactured in a substantially cylindrical shape of about 1500 mm.
In this embodiment, after the earth and sand component 13 such as stone gravel is removed by the water injection means or the air blow means, the water permeable sheet 2 molded in a cylindrical shape in advance is internally fitted into the inner peripheral portion of the hollow rod-shaped reinforcing member 1. , The intermediate portion (Kuriishi layer 22) in which the discharge hole 1a is arranged is slid and positioned until it covers the entire area. However, the total length of the water permeable sheet 2 is not limited to covering the entire intermediate portion (Kuriishi layer 22) as shown in the illustrated example, and may be carried out with a length reaching the stone building layer 21 (about 2300 mm). can.
There are various positioning means, but in this embodiment, the key points of the water permeable sheet 2 are fixed to the inner peripheral portion of the hollow rod-shaped reinforcing member 1 by attaching a tape material (for example, double-sided tape).
The performance (permeability) of the water-permeable sheet 2 makes it possible to exude the injected solidifying material 8 to the outside (inner peripheral portion of the hollow rod-shaped reinforcing member 1) substantially evenly and moderately while blocking the injected solidifying material 8, for example. The hydraulic conductivity ^{is preferably about 5 × 10 -3} cm / s.

In the reinforcement method of the stone wall 20, when the chestnut stone layer 22 is composed of earth and sand components 13 such as stone gravel mixed with fine earth and sand, the filling effect of the solidifying material 8 to be injected later, particularly the foaming effect, is removed. It is carried out in order to demonstrate the above efficiently and surely.

In this reinforcement method, first, the hollow rod-shaped reinforcing member 1 is inserted into the joint portion of the stone layer 21 by a drilling machine (lightweight boring machine, not shown) such as a drifter that applies a striking force while rotating, and then in the horizontal direction. A slope (for example, about 5 to 10 degrees) is formed slightly diagonally downward, and the stone is driven toward the anchoring layer 23 such as a ground. In this embodiment, although not shown, the inner bit connected to the drilling machine via a rod is inscribed in the drilling bit 7 at the tip of the hollow rod-shaped reinforcing member 1, and the drilling is performed. A striking force (propulsive force) is applied while rotating the rod and the inner bit by operating the machine, and the drilling bit 7 is driven by rotating the drilling bit 7 following (interlocking) the rotation of the inner bit.
In this embodiment, in consideration of the good flow of the solidifying material 8, the solidifying material 8 is cast on the fixing layer 23 with a slope slightly diagonally downward in the horizontal direction, but the casting is not limited to this, and the solidifying material 8 is cast in the horizontal direction. Of course, it can also be carried out.

After driving (or driving) the hollow rod-shaped reinforcing member 1 to a predetermined position of the fixing layer 23, water or water or water from the injection port of the hollow rod-shaped reinforcing member 1 to the hollow portion while rotating the hollow rod-shaped reinforcing member 1. By injecting air at a predetermined pressure, the air is injected or air blown from the discharge hole 1a into the external Kuriishi layer 22 through the hollow portion, and fine earth and sand in the Kuriishi layer 22 around the hollow rod-shaped reinforcing member 1 is performed. The earth and sand component 13 such as mixed stone gravel is removed (washed).

After the removal work is completed, the hollow rod-shaped reinforcing member 1 is fixed to the fixing layer 23 in a state where the rear end thereof is positioned so as to slightly protrude from the outside of the stone wall 20. At this stage, as shown in FIG. 6, the discharge hole 1a of the hollow rod-shaped reinforcing member 1 is provided so as to open in the upper half portion. The significance of providing the discharge hole 1a upward is to discharge and diffuse the solidifying material 8 discharged from the discharge hole 1a not only below the peripheral portion of the hollow rod-shaped reinforcing member 1 but also upward as much as possible. Is. This is to form a high-strength, high-quality tubular solidified layer 9 having a wide solidified region.

In the fixing work, position adjustment is performed such as inserting an injection tube (for example, about φ13 mm, not shown) for injecting a fixing material 12 such as cement or grout into the hollow portion of the hollow rod-shaped reinforcing member 1 to the back. .. If necessary, the injection part and the non-injection part are separated by inserting an insert packer equipped with a check valve packer to prevent leakage.
Next, the fixing material 12 is injected through the injection tube and discharged from the inner end of the hollow rod-shaped reinforcing member 1 to the outside, and as shown in FIG. 3, the fixing layer around the hollow rod-shaped reinforcing member 1 is formed. 23 is consolidated by the fixing material 12 to impose the role of an anchor.

Next, the cylindrical water-permeable sheet 2 is internally fitted into the inner peripheral portion of the hollow rod-shaped reinforcing member 1 from the injection port of the hollow rod-shaped reinforcing member 1, and the intermediate portion (where the discharge hole 1a is arranged) is arranged. Kuriishi layer 22) Slide and position until it covers the entire area. In this embodiment, this positioning operation is carefully performed by the operator's fingers in order to prevent the water permeable sheet 2 from being damaged.

After setting the tubular water-permeable sheet 2 inside the hollow rod-shaped reinforcing member 1, the solidifying material (urethane foam) 8 is injected into the cylindrical water-permeable sheet 2. The solidifying material 8 exudes substantially evenly to the outside (inside of the hollow rod-shaped reinforcing member 1) over the entire length of the water-permeable sheet 2 through the hollow portion of the water-permeable sheet 2, and further, the chestnut layer 22 passes through the discharge hole 1a. It is discharged and diffused to. Thus, not only the inside of the hollow rod-shaped reinforcing member 1 but also the chestnut stones 22 are consolidated while filling the gap formed between the chestnut stones 22 around the hollow rod-shaped reinforcing member 1, thereby improving the chestnut stone layer 22 to a predetermined strength and rigidity. The solidified layer 9 is formed.

After that, the stone wall 20 is supported by joining the fixing plate 11 to the protruding portion of the rear end portion (base end portion) of the hollow rod-shaped reinforcing member 1 by joining means such as bolts and welding.

Then, the construction steps described in the above paragraphs [0023] to [0029] are repeated according to the number of the hollow rod-shaped reinforcing members 1 to be cast (12 in a substantially staggered arrangement in the illustrated example), and thus the stone wall 20 The reinforcement method of is completed.

Thus, in the reinforcing structure constructed by the above-mentioned stone wall 20 reinforcing method, the hollow rod-shaped reinforcing member 1 is positioned and fixed to the fixing layer 23 via the chestnut stone layer 22 behind the stone building layer 21, and the tubular water permeable member 1. The solidifying material 8 exuded substantially evenly to the outside (inside of the hollow rod-shaped reinforcing member 1) over the entire length of the water-permeable sheet 2 through the hollow portion of the property sheet 2 is discharged and diffused substantially evenly from the drain hole 1a to the outside. By solidifying the hollow rod-shaped reinforcing member 1, a uniform and high-quality tubular solidified layer 9 is formed on the outer periphery of the hollow rod-shaped reinforcing member 1 to exhibit a reinforced structure.

Although the examples have been described above based on the drawings, the present invention is not limited to the illustrated examples, and includes a range of design changes and application variations normally performed by those skilled in the art within a range that does not deviate from the technical idea thereof. I will mention it just in case.
For example, the dimensions, performance, and the like of the hollow rod-shaped reinforcing member 1 and the water-permeable sheet 2 are merely examples. Of course, the hollow rod-shaped reinforcing member 1 can be implemented in a configuration in which pipe materials whose ends are threaded are connected to each other by a coupler, in addition to the real one.
Further, in this embodiment, the stone wall 20 has been mainly described, but the same can be applied to a masonry wall.

1 Hollow rod-shaped reinforcing member 1a Discharge hole 2 Water permeable sheet 3 Protective pipe 3a Slit 4 Drilling bit (lost bit)
8 Solidifying material 9 Cylindrical solidifying layer 11 Fixing plate 12 Fixing material (cement)
13 Sediment components (stone gravel, etc.)
20 Stone wall 21 Stone layer (stone)
22 Kuriishi layer (Kuriishi)
23 Settlement layer (ground)

Claims (5)

A hollow rod-shaped reinforcing member provided with a plurality of discharge holes in the axial direction is inserted into the joint portion of the stone layer for positioning, and the hollow rod-shaped reinforcing member is positioned by a water injection means or an air blow means using the discharge holes. The process of removing the earth and sand components on the outer circumference and
A step of sliding and setting a cylindrical water-permeable sheet inside the hollow rod-shaped reinforcing member, and
The solidifying material is injected into the tubular water-permeable sheet, and the solidifying material that has exuded from the water-permeable sheet to the inside of the hollow rod-shaped reinforcing member is exuded substantially evenly to the outside through the discharge holes. The process of forming a tubular solidified layer on the outer circumference of the hollow rod-shaped reinforcing member to reinforce it,
A method of reinforcing a stone wall or a masonry wall, which is characterized by having. The hollow rod-shaped reinforcing member is positioned by fixing its inner end portion to a fixing layer existing via a chestnut stone layer behind the stone wall, and the tubular solidified layer is formed on the chestnut stone layer. The method for reinforcing a stone wall or a masonry wall according to claim 1, wherein the stone wall or the masonry wall is reinforced. The method for reinforcing a stone wall or a masonry wall according to claim 1 or 2, wherein the discharge hole of the hollow rod-shaped reinforcing member is provided so as to open in the upper half portion when the solidifying material is injected. .. 6. Reinforcement method for stone walls or masonry walls. A hollow rod-shaped reinforcing member with a cylindrical permeable sheet is positioned behind the stone layer.
The hollow rod-shaped reinforcing member is provided with a plurality of discharge holes in the axial direction, and the solidifying material discharged from the discharge holes through the hollow portion of the cylindrical water-permeable sheet exudes substantially evenly to the outside and is solidified. A reinforcing structure for a stone wall or a masonry wall, characterized in that a tubular solidified layer is formed and reinforced on the outer periphery of the hollow rod-shaped reinforcing member.

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