JP4316941B2 - Masonry wall reinforcement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for reinforcing a masonry wall in which a plurality of stone blocks are stacked so as to be adjacent to each other, and more particularly to an effective reinforcement method when the backfill concrete of an existing masonry wall is aged. .
[0002]
[Prior art]
As a type of retaining wall, there is known an empty-masonry masonry wall in which stone blocks such as machinite are simply stacked, and a masonry-type masonry wall in which stone blocks such as stacked slabs are integrated with backfill concrete. It has been. The latter masonry wall is more stable than the former masonry wall because the stone blocks are constrained by backfill concrete.
[0003]
However, even in such masonry type masonry walls, for example, when the backfilling concrete has deteriorated over time, or when the backfilling concrete is poorly blended and its integrity is weak, Reinforcement such as is necessary.
[0004]
As a seismic reinforcement measure for this type of masonry wall, for example, as described in Non-Patent Document 1, the following six methods have been conventionally employed.
(1). Method of filling mortar in joint part of stone block (2). Construction method of concrete retaining wall in front of masonry wall (3). How to install a lattice frame in front of the masonry wall (4). In this method of placing natural ground reinforcement earthwork from the front of the masonry wall, in this method, since the reinforcing material is deeply placed in the back ground, the length of the reinforcing material needs to be 2 m or more.
(5). Method of placing a ground anchor from the front of the masonry wall (6). However, such a conventional method for reinforcing a masonry wall has the following problems.
[0005]
[Non-Patent Document 1]
Regarding the technology for seismic reinforcement and repair of residential walls, “Foundation” Vol. 29, No.4, pp21-27, 2001.
[0006]
[Problems to be solved by the invention]
That is, in the method (1), the stone blocks are not sufficiently connected to each other, which is effective in preventing the backfill soil from being lost, but the effect on the stability of the entire masonry wall cannot be expected.
[0007]
The method {circle around (2)} has the effect of improving the stability of the masonry wall, but the effect on the fall of the masonry wall caused by the sinking of the backfilled chestnut is low and the construction cost is high. (3) The method has a low effect on the falling of the masonry wall due to the sinking of backfilled chestnut, and there is a possibility that the stone block will come out.
[0008]
(4) With the method, the placement machine becomes large, construction is difficult when the front site is narrow, and the construction cost is high. In the methods (5) and (6), the placement machine becomes even larger than the method (4), and the construction cost is further increased.
[0009]
To summarize the above problems, the conventional masonry wall reinforcement method has a low effect on the stability of the entire masonry if the construction cost is low, and the effective method as a reinforcement measure is very expensive and has a large scale. There was a conflicting problem that required a simple construction machine.
[0010]
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a reinforcing method capable of ensuring the stability of a masonry wall at a relatively low cost. is there.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is configured by stacking a plurality of stone blocks such as chopping stones adjacent to each other with a back-filled chestnut layer interposed on the front surface of an inclined ground, and between the stone blocks. In the method for reinforcing an existing masonry wall filled with embedding concrete, drilling holes reaching the backfilling chestnut layer from the front of the masonry wall are formed at a plurality of locations, and in the drilling hole, before or after pouring grout, Each material was inserted, and by inserting the bar-shaped reinforcing material, the plurality of stone blocks arranged adjacent to each other were pushed outward, thereby restraining the stone blocks to each other and solidifying the grout material The reinforcing part was locally provided.
[0012]
According to the method for reinforcing a masonry wall configured as described above, by providing a local reinforcement portion, a partial improvement and reinforcement effect can be obtained, and the weakening of the backfill concrete can be reinforced, and the existing masonry wall can be Stabilization can be achieved.
[0013]
In this case, in the reinforcing method of the present invention, the length of the drilling hole only needs to reach the backfilled chestnut layer, and this length is slightly longer than the length of the stone block, and is usually 2 m. A drilling hole with this length can be constructed by a small drilling machine such as a hand drill or a small boring machine, and should be easily constructed even in a narrow front area. In addition, the construction cost is low and the construction period can be shortened. Further, when the rod-shaped reinforcing material is inserted, the plurality of stone blocks arranged adjacent to each other are pushed outward to restrain each other, so that the stone block can be stabilized.
[0014]
Moreover, in this invention, the said drilling hole can be formed so that it may penetrate the said backfilling chestnut layer and may reach the said sloping ground.
[0015]
According to this structure, since the reinforcement part which penetrates this is locally provided also in the backfilling chestnut stone layer, the backfilling chestnut stone layer can be stabilized.
[0018]
A wide plate is fixed to the head before or after insertion into the drilling hole, and the plurality of stone blocks arranged adjacent to the outer periphery of the joint are supported on the rod-shaped reinforcing material. , Can be restrained.
[0019]
According to this configuration, since the plurality of stone blocks arranged adjacent to the outer periphery of the joint portion are supported and restrained by the wide plate, the stability of the masonry wall is increased.
[0020]
The front side of the stone block is covered with a covering material such as a netting material or a sheet before or after the rod-shaped reinforcing material is placed, and when the reinforcing material is placed, the wide plate The covering material can be locked and fixed to the front surface of the stone block.
[0021]
According to this configuration, by covering the covering material on the front surface of the stone block, the integration of the masonry wall can be further strengthened, and the covering pitch of the reinforcing material can be widened by covering the covering material. be able to.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a reference example showing a basic configuration of a method for reinforcing a masonry wall according to the present invention.
[0027]
In the reinforcing method shown in the figure, a plurality of stone blocks 14 are stacked in the vertical direction with a backfilled chestnut layer 12 interposed on the front surface of the sloped ground mountain 10 so as to be adjacent to each other. It is applied to the existing masonry wall 16 of the kneading method filled with the backfill concrete 15. The back-filled chestnut layer 12 is a laminate of chestnut stones with a predetermined thickness.
[0028]
The stone block 14 is composed of crushed stone and the like, has a substantially square front surface, is aligned so that the holding length L is substantially the same, and is formed so that the vertical cross section has a substantially triangular shape.
[0029]
Such a stone block 14 is stacked in a multi-stage shape, with the outer peripheral end faces adjacent to each other in the left and right and up and down directions, as seen from the front side, so that some of the corners and sides abut each other. An existing masonry wall 16 is constructed.
[0030]
Such a masonry wall 16 is more stable than the case of the empty product method because each stone block 14 is integrated with the backfill concrete 15, but the backfill concrete 15 is aged or poorly mixed. When concrete is used, it becomes brittle and requires seismic reinforcement.
[0031]
Further, as a result of the vibration experiment, the masonry wall 16 having such a structure has the back-filled chestnut layer 12 of the masonry wall 16 subsided due to vibration, and the masonry wall 16 protrudes from the front surface or the head It is known that the phenomenon of part tilting occurs and it becomes unstable.
[0032]
Therefore, in this reference example , a method for stabilizing the masonry wall 16 and preventing the settlement of the backfilled chestnut layer 12 was devised. In this reinforcing method, a drilling hole 18 that reaches the backfilled chestnut layer 12 from the front surface of the masonry wall 16 is formed, and a grout material 20 is injected into the drilling hole 18 to solidify the grout material 20. Was provided locally.
[0033]
In the case of this reference example , the drill holes 18 are provided in the joint portions of the stone block 14 and are arranged in a staggered manner at every other joint portion adjacent in the vertical and horizontal directions. The hole 18 is constructed from the front side of the masonry wall 16 by a small hole drilling machine such as a hand drill or a small boring machine.
[0034]
In the case of this reference example , the drilling hole 18 is provided so as to penetrate the backfilled chestnut layer 12 so that the tip reaches the inclined ground mountain 10 and penetrates into the ground mountain 10 for a predetermined length. However, the drilling hole 18 only needs to be provided up to a position where the tip reaches the backfilling chestnut layer 12.
[0035]
The grout material 20 has a predetermined fluidity in an initial state and is solidified or hardened with the passage of time. For example, the grout material 20 is composed of mortar, resin mortar, or the like.
[0036]
When the grout material 20 having fluidity is injected into the drill hole 18, the grout material 20 is formed along the crack portion of the ground backfilling concrete 15 and the gap between the chestnut stones of the backfilled chestnut layer 12. It flows outward and then solidifies over time.
[0037]
At this time, in the backfilled chestnut stone layer 12, since the gap between the chestnut stones is relatively large, the grout material 20 flows over a wider range. As a result, the reinforcing portion 22 has a diameter at the portion of the chestnut stone layer 12, The shape becomes larger than other parts.
[0038]
According to the method for reinforcing a masonry wall configured as described above, by providing the local reinforcing portion 22, a partial improvement and a reinforcing effect can be obtained, the weakening of the backfill concrete 15 is reinforced, and the existing stone masonry is strengthened. The wall 16 can be stabilized.
[0039]
In this case, in the reinforcing method of this reference example , the length of the hole 18 only needs to reach the backfilled chestnut layer 12, and this length is slightly longer than the length L of the stone block 14. In general, it is a relatively short value within 2m, and drilling of this length can be done with a small drilling machine such as a hand drill or a small boring machine, even if the front site is narrow. It can be easily constructed, and the construction cost is low, and the construction period can be shortened.
[0040]
Further, in the case of this reference example , since the drilling hole 18 reaches the inclined ground 10, the reinforcing portion 22 is provided so as to penetrate the backfilled chestnut layer 12. By providing, the backfilling chestnut stone layer 12 can be partially improved and reinforced, and the backfilling chestnut stone layer 12 as a whole can be prevented from sinking.
[0041]
In addition, the hole 18 of this reference example can be formed not only in the joint portion of the stone block 14 but also in the periphery of the stone block 14 from the front surface of the masonry wall 16. It is also possible to use the joint hole 18 shown in the embodiment together.
[0042]
FIGS. 3 to 5 show a first embodiment of a method for reinforcing a masonry wall according to the present invention. The same or corresponding parts as those in the above-mentioned reference example are denoted by the same reference numerals and description thereof is omitted. Only the characteristic points will be described in detail below.
[0043]
In the embodiments shown in these drawings, similarly to the first embodiment, a drill hole 18a reaching the backfilled chestnut layer 12a is formed in the joint portion of the stone block 14a, and the grout material 20a is formed in the drill hole 18a. The reinforcing portion 22a is locally provided by filling.
[0044]
In the case of the present embodiment, the rod-shaped reinforcing member 24a is inserted into the hole 18a before or after the grout material 20 is injected after forming the hole 18a. The rod-shaped reinforcing member 24a is, for example, a reinforcing bar or the like, and contacts the plurality of stone blocks 14a adjacent to the joint portion when inserted into the drilling hole 18a, thereby removing these stone blocks 14a. It has the necessary diameter to constrain them.
[0045]
Further, in the case of the present embodiment, a screw is engraved on the head of the rod-shaped reinforcing member 24a, and when the reinforcing member 24a is inserted, the threaded portion protrudes to the front side of the masonry wall 16a. Insert into.
[0046]
When the insertion of the reinforcing material 24a is completed and fixed by the grout material 20a, as shown in FIGS. 4 and 5, a wide plate 26a is attached to the head of the reinforcing material 24a, and the nut 28a is attached to the reinforcing material. It is fixed by being screwed onto the screw 24a.
[0047]
The wide plate 26a is a flat plate having a size covering the ends of the four stone blocks 14a arranged adjacent to the joint portion, and is formed in a circular shape in the case of the present embodiment, and is formed on the head of the reinforcing member 24a. When fixed, the wide plate 26a comes into contact with the surface of the four stone blocks 14a adjacent to the joint portion where the reinforcing member 24a is inserted, and supports and restrains them. The shape of the wide plate 26a is not limited to a circle, and may be, for example, a polygon or an ellipse.
[0048]
In this embodiment, the rod-shaped reinforcing member 24a is inserted into the hole 18a and fixed with the grout material 20 to form the reinforcing portion 22a. Therefore, the rigidity of the reinforcing portion 22a is increased and local reinforcement is performed. Increases effectiveness.
[0049]
Further, in this embodiment, in addition to restraining the reinforcing material 24a to push the stone block 14a outward, a plurality of stone blocks 14a (maximum) arranged adjacent to the outer periphery of the joint portion by the wide plate 26a. 4) is supported and restrained, so that the stability of the masonry wall 16a is further increased.
[0050]
6 and 7 show a second embodiment of the method for reinforcing a masonry wall according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted. Only the characteristic points will be described below.
[0051]
In the embodiments shown in these drawings, similarly to the first embodiment , a drill hole 18b reaching the backfilled chestnut layer 12b is formed in the joint portion of the stone block 14b, and the grout material 20b is formed in the drill hole 18b. By injecting and filling, the reinforcing portion 22b is locally provided, and the rod-shaped reinforcing material 24b is inserted into the hole 18b.
[0052]
The reinforcing members 24b are arranged in a zigzag shape as a whole, and come into contact with a plurality of stone blocks 14b adjacent to the joint portions so that these stone blocks 14b are pushed outward to restrain them. It has the necessary diameter.
[0053]
In the case of the present embodiment, the reinforcing member 24b is set so that the tip of the reinforcing member 24b penetrates the backfill chestnut stone layer 12b and penetrates the inclined ground mountain 10b by a predetermined length when placed. The wide plate 26b is fixed in advance.
[0054]
The wide plate 26b has a function of supporting and restraining a plurality of stone blocks 14a (up to four) arranged adjacent to the outer periphery of the joint portion, as in the first embodiment . In the embodiment configured in this manner, in addition to the operational effects of the above-described embodiment, the reinforcing material 24b penetrates to the back ground 10b, so that the masonry wall 16b is deformed to the front side by the retaining effect of the reinforcing material 24b. It becomes possible to prevent that.
[0055]
8 and 9 show a third embodiment of the method for reinforcing a masonry wall according to the present invention. The same or corresponding parts as those in the above embodiment are given the same reference numerals and the description thereof is omitted. Only the characteristic points will be described below.
[0056]
In the embodiments shown in these drawings, similarly to the first and second embodiments , a hole 18c reaching the ground 10c is formed in the joint portion of the stone block 14c, and the grout material 20c is formed in the hole 18c. By injecting and filling, the reinforcing portion 22c is locally provided, and the rod-shaped reinforcing material 24c is inserted into the hole 18c.
[0057]
A wide plate 26c is fixed to the head of the reinforcing member 24c in advance. In the case of the present embodiment, a covering material 30c such as a net or sheet is covered on the front side of the masonry wall 16c so as to cover the surface of the stone block 14c before placing the reinforcing material 24c. As the covering material 30c, a wire net or a synthetic resin net, a synthetic resin sheet, a fiber sheet, or the like netted in a predetermined mesh is used.
[0058]
When the reinforcing member 24c is inserted into the hole 18c, the wide plate 26c is engaged and fixed so that the covering member 30c is sandwiched between the wide plate 26c and the surface of the stone block 14c. In the reinforcing method configured as described above, the following effects can be obtained in addition to the functions and effects of the above embodiment.
[0059]
In the case of the present embodiment, the covering 30c is provided on the front side of the stone block 14c before the reinforcing member 24c is installed, and the covering 30c is locked and fixed to the front of the stone block 14c by the wide plate 26c. By covering the covering material 30c, the integration of the masonry walls 16c can be further strengthened, and the covering pitch of the covering material 30c can increase the arrangement pitch of the reinforcing members 24c.
[0060]
In the third embodiment shown in FIGS. 8 and 9, the reinforcing member 24c having the wide plate 26c fixed in advance on the head is used. However, the wide plate 26c is fixed in advance on the reinforcing member 24c. Is not always necessary, for example, as in the second embodiment, the wide plate 26a is not fixed to the reinforcing member 24a in advance, and the covering member 30c is covered on the front surface of the stone block 14a after the reinforcing member 24a is installed. Thereafter, the wide plate 26a can be fixed to the head of the reinforcing member 24a.
[0070]
【The invention's effect】
As described above in detail, according to the method for reinforcing a masonry wall according to the present invention, the stability of the masonry wall can be ensured at a relatively low cost.
[Brief description of the drawings]
FIG. 1 is a plan view of a construction completion state showing a reference example of a method for reinforcing a masonry wall according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view of a construction initial state showing a first embodiment of a method for reinforcing a masonry wall according to the present invention.
FIG. 4 is a plan view of a construction completion state showing a first embodiment of a method for reinforcing a masonry wall according to the present invention.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a plan view of a construction completion state showing a second embodiment of the method for reinforcing a masonry wall according to the present invention.
7 is a cross-sectional view taken along line CC in FIG.
FIG. 8 is a plan view of a construction completion state showing a third embodiment of the method for reinforcing a masonry wall according to the present invention.
9 is a cross-sectional view taken along the line DD of FIG.

Claims (4)

In the method of reinforcing an existing stone masonry wall in which a backfilled chestnut stone layer is interposed on the front of an inclined ground mountain, and a plurality of stone blocks such as crushed stones are stacked adjacent to each other, and the backfill concrete is filled between the stone blocks. ,
Drilling holes that reach the backfilled chestnut layer from the front of the masonry wall are formed at a plurality of locations, and a rod-shaped reinforcing material is inserted into the drilling holes before or after the injection of grout, respectively. A masonry wall characterized in that a plurality of stone blocks arranged adjacent to each other are pushed outward to restrain the stone blocks to each other, and a reinforcing part that solidifies the grout material is locally provided. Reinforcement method. 2. The method for reinforcing a masonry wall according to claim 1, wherein the hole is formed so as to penetrate the backfilled chestnut layer and reach the inclined ground. The rod-shaped reinforcing member is supported by supporting a plurality of stone blocks arranged adjacent to the outer periphery of the joint portion by fixing a wide plate on the head before or after insertion into the drilling hole, The method for reinforcing a masonry wall according to claim 1, wherein the method is restrained. The front side of the stone block is covered with a covering material such as a netting material or a sheet before or after the reinforcement material is installed, and the covering material is locked and fixed to the front surface of the stone block with the wide plate. The method for reinforcing a masonry wall according to any one of claims 1 to 3, wherein:

Images