JP3852161B2 - Earthquake-resistant wall expansion method for existing buildings, earthquake-resistant walls to be added to existing buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for expanding a seismic wall that is retrofitted to an existing building.
[0002]
[Prior art]
If an attempt is made to add a seismic wall to an existing building, the conventional method will attempt to add an anchor to the column member or beam member to which the seismic wall is to be added, and then connect the vertical and horizontal bars to the anchor. A mold is attached corresponding to the positions of both sides of the earthquake-resistant wall, and then concrete is placed and cured in the mold, and the mold is disassembled after the concrete is hardened.
[0003]
[Problems to be solved by the invention]
However, in the conventional method for expanding a seismic wall, a large amount of material is required by using the formwork, and a lot of work is required to assemble and disassemble the formwork. In addition, a large noise is generated during the dismantling, which disturbs daily work in the building. In addition, since the entire earthquake-resistant wall is formed of concrete, a large amount of concrete is required, and it is necessary to carry this concrete from the plant factory. For this reason, even if an attempt is made to perform expansion work on a holiday so as not to interfere with daily operations in the existing building, the plant factory is also closed for the holiday and cannot receive the supply of concrete. There is also a problem that it is not possible to plan a proper work schedule. Furthermore, since the amount of concrete used is large, it takes a considerable period of time for curing, and it takes a long time to complete the earthquake-resistant wall.
[0004]
Therefore, as disclosed in, for example, Japanese Examined Patent Publication No. 7-45783 (Int.Cl.E04H 9/02), an earthquake-resistant wall that has been molded in advance by precasting at a factory or the like is fitted between columns and beams of an existing building. However, in this case, it is extremely difficult to carry the earthquake-resistant wall, which is molded as a whole, into the existing building, and in some cases, it is carried into the outer wall of the building. Therefore, it is necessary to form a large opening for the construction, and the construction becomes remarkably large.
[0005]
Further, as disclosed in, for example, Japanese Patent Laid-Open No. 3-76953 (Int.Cl.E04B 2/02), a concrete block in which a seismic wall is divided into a plurality of boxes and precast in a box shape is used. In this case, since the earthquake resistant wall is subdivided by the concrete block, the concrete block can be easily carried into the existing building. However, since the concrete block in this case has a box shape and the inside is hollowed and also serves as a mold, it is necessary to place a large amount of concrete in the cavity after the concrete blocks are stacked. Therefore, the necessity of such a large amount of concrete has a problem that the construction period is prolonged due to the problem of concrete procurement and curing period as in the conventional construction method described above.
[0006]
Therefore, in view of the conventional problems, the present invention can shorten the construction period while eliminating the installation of the formwork that requires time and labor for assembly and disassembly and facilitating the carrying of materials into the existing building. The purpose is to provide a method for expanding a seismic wall to an existing building.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, in the method for extending a seismic wall to an existing building according to claim 1 of the present invention, the inside of the frame surrounded by the column member and the beam member is divided into a plurality of sizes in the vertical and horizontal directions. thereby formed is, a concrete block having a first recess having a spatial volume enough to house the vertical stripe preformed on the left right end, the anchors member provided on the beam member of the skeleton frame, the anchor While connecting the vertical bars to the member and storing the vertical bars in the first recesses, the first recesses are aligned in the vertical direction from the lower stage to the upper stage in the frame. After laminating, the grout material is filled in the first recesses of the laminated concrete blocks.
[0008]
Moreover, in the earthquake-proof wall extension construction method to the existing building shown in Claim 2 of this invention, the 2nd recessed part which has a space volume of the grade which accommodates a horizontal stripe is provided in the upper-lower-end part of the said concrete block, The said frame An anchor member for connecting the horizontal bar to the column member is provided, the horizontal bar to be connected to the anchor member is housed in the second recess, and the concrete block is stacked while arranging the bars inward of the frame, Then, a grout material is filled in the second recess.
Moreover, in the earthquake resistant wall added to the existing building shown in claim 3 of the present invention, the inside of the frame surrounded by the column member and the beam member is formed into a size divided into a plurality of parts in the vertical and horizontal directions. A concrete block provided with a first recess having a space volume enough to accommodate vertical bars at the left and right ends is formed in advance, an anchor member is provided on the beam member of the frame, and the vertical bars are coupled to the anchor member. Then, while storing the vertical bars in the first recess, the plurality of concrete blocks are stacked in the frame so that the first recess is aligned in the vertical direction from the lower stage to the upper stage, and then stacked. The above-mentioned first recesses of these concrete blocks are filled with a grout material.
[0009]
The operation of the present invention with the above configuration will be described below. Claims 1 and 3 construct a seismic wall by laminating concrete blocks formed in a size obtained by dividing the inside of a frame into a plurality of vertical and horizontal directions. In the first recesses formed at the left and right ends of the concrete block at the time of lamination, the vertical bars coupled to the anchor member provided on the beam member are accommodated. And after that, the grout material is filled in the first recesses of the laminated concrete blocks, whereby the concrete blocks are connected to each other and the concrete blocks are connected to the vertical bars. At this time, since the concrete block has a size obtained by dividing the inside of the frame into a plurality of parts in the vertical and horizontal directions, each concrete block is reduced in size and weight, and can be easily carried into an existing building. In addition, since the first recess is formed in a space volume enough to accommodate the vertical stripes, the amount of grout material used to fill the first recess can be greatly reduced. For this reason, since the amount of the grout material is small, it can be easily mixed at the site and there is no need to procure concrete from the plant factory. The work can be performed, and the curing period of a small amount of grout material is short and the construction period can be shortened.
[0010]
According to a second aspect of the present invention, the horizontal bars to be coupled to the anchor members provided on the column members of the frame are stored in the second recesses provided at the upper and lower ends of the concrete block and are arranged inside the frame while the concrete is being arranged. Since the blocks are stacked and then the grout material is filled in the second recess, the concrete block is combined with the transverse bar and integrated. In addition, since the second concave portion has a space volume enough to store the horizontal stripes in the same manner as in the method of claim 1, a small amount of grout material can be filled in the second concave portion. Even if it is combined with the amount of grout material filled in the first recess shown, a small amount of grout material can be used as a whole. And in the earthquake-resistant wall extension construction method using this horizontal reinforcement, the intensity | strength of an earthquake-resistant wall can be increased more combined with the vertical reinforcement used by the structure of the said Claim 1. FIG.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show a first embodiment of a method for expanding a seismic wall to an existing building according to the present invention, FIG. 1 is a front view showing the construction of the seismic wall, FIG. 2 is the same plan view, and FIG. FIG. 4 is a perspective view showing a concrete block, and FIG. 4 is an explanatory view showing a concrete block provided with transverse stripes by a front view of (a), a plan view of (b), and a side view of (c).
[0012]
That is, in the method of adding a seismic wall to an existing building according to this embodiment, the vertical bars 16 and the horizontal bars 18 are arranged in the frame 14 surrounded by the columns 10 and the beams 12 as shown in FIGS. The seismic wall 21 is constructed by laminating a plurality of concrete blocks 20 while straightening. As shown in FIG. 3, the concrete block 20 is formed in a solid rectangular parallelepiped shape having a size obtained by dividing the inside of the frame 14 into a plurality of lengths and widths by precast concrete. The left and right ends of the concrete block 20 are formed with first recesses 20a having a space volume s1 enough to accommodate the vertical streaks 16, and the upper ends of the concrete blocks 20 accommodate the horizontal streaks 18. A second recess 20b having a certain spatial volume s2 is formed. Further, as shown in FIG. 4, in the concrete block 22 laminated on the portion where the horizontal stripe 18 is arranged, the horizontal stripe 18 is embedded in the center in the height direction, and both ends of the concrete blocks 20 and 22 are embedded at both ends. It protrudes from both ends with a length of ½ or more of the lateral width w. The concrete block 22 and the concrete block 20 are formed in exactly the same shape except that the horizontal bars 18 are buried, and the first recess 22a and the second recess 22b are also formed in the concrete block 22 in the same manner. Is done.
[0013]
In this embodiment, when the concrete blocks 20 and 22 are stacked, first, the post-construction anchor 24 is placed on the lower surface of the beam 12 with the width w of the concrete blocks 20 and 22 as a pitch, and the pillar 10 The post-construction anchor 26 is driven in correspondence with the position where the horizontal stripes 18 are arranged on the inner surface of the post-installation. Connecting reinforcements 24 a and 26 a are coupled to the respective post-installed anchors 24 and 26 so as to protrude inward of the frame 14.
[0014]
In addition, when the concrete blocks 20 and 22 are stacked, those adjacent in the lateral direction are alternately arranged with a height difference of half the height h of the concrete blocks 20 and 22. Therefore, in the lower layer portion where the concrete blocks 20 and 22 are laminated, the auxiliary concrete blocks 28 formed at every other height of 1 / 2h are installed as shown in FIG. Similarly to the concrete block 20, the auxiliary concrete block 28 is also formed with a first recess 28a at the left and right ends and a second recess 28b at the upper end.
[0015]
And in order to construct | assemble the said earthquake-resistant wall 21, after arrange | positioning the said concrete block 20 and the said auxiliary concrete block 28 alternately on the floor slab in the said housing frame 14, the concrete block 20 is laminated | stacked sequentially on each upper side. To do. At this time, the concrete block 20 is laminated in a state where the vertical streaks 16 are housed in the first concave portion 20a of the concrete block 20 and the first concave portion 28a of the auxiliary concrete block 28 that are continuously arranged in the vertical direction. The upper end of the vertical bar 16 is superposed with the connecting bar 24a of the post-installed anchor 24.
[0016]
Further, when the concrete blocks 20 are stacked to a predetermined height of the frame 14, the concrete blocks 22 in which the horizontal bars 18 are buried are arranged every other side, and the ends of the horizontal bars 18 protruding from the concrete blocks 22 are arranged. The parts are polymerized together. At this time, the horizontal bars 18 are housed in the second recesses 20b of the concrete blocks 20 arranged between the concrete blocks 22. Further, the horizontal bars 18 arranged at both ends in the horizontal direction are superposed on the connecting bars 26 a of the post-construction anchor 26.
[0017]
The concrete block 20 is laminated up to the vicinity of the beam 12. Although not shown in the upper end portion of the laminated concrete block 20, half the height 1 / every other horizontal direction is the same as the lower end portion. The auxiliary concrete blocks 28 of 2 h are laminated and leveled to a uniform height. Moreover, when laminating the concrete blocks 20 and 22 and the auxiliary concrete block 28, the first recesses 20a, 22a and 28a are arranged in a straight line in the vertical direction, and in these first recesses 20a, 22a and 28a, Mortar used as a grout material is injected and filled. The first recesses 20a, 22a, 28a communicate with the second recesses 20b, 22b, 28b, respectively, and the mortar filled in the first recesses 20a, 22a, 28a is the second recesses 20b, 22b. , 28a are simultaneously filled. When the concrete blocks 20 and 22 (or the auxiliary concrete block 28) are stacked up to just below the beam 12, the gap between the concrete blocks 20 and 28 and the beam 12 is filled with mortar.
[0018]
By filling the first recesses 20a, 22a, 28a and the second recesses 20b, 22b, 28b with mortar, the concrete blocks 20, 22 and the auxiliary concrete block 28 are coupled to each other and connected to the longitudinal bars 16. The overlapping portion between the streaks 24a and the overlapping portion between the horizontal bars 18 and the connecting bars 26a are lap joints. In addition to the lap joint, a mechanical joint such as a grip joint can be used for the connection between the vertical bars 16 and the horizontal bars 18 and the connecting bars 24a and 26a.
[0019]
Therefore, in the above-described method of adding a seismic wall to an existing building according to the present embodiment, the concrete blocks 20 and 22 and the auxiliary concrete block 28 are carried into the frame 14 surrounded by the columns 10 and the beams 12. These are laminated with the vertical bars 16 and the horizontal bars 18 interposed therebetween, and the first recesses 20a, 22a, 28a and the second recesses 20b, 22b, 28b are filled with mortar, whereby the earthquake resistant wall 21 is constructed. It is like that. Therefore, it is not necessary to use a formwork as in the conventional construction method, so that the work of carrying in and out the formwork material becomes unnecessary, and the work required for this is omitted because the work of assembling and disassembling the formwork is eliminated. , Noise generation during assembly and disassembly can be eliminated.
[0020]
Further, the concrete blocks 20 and 22 have a size obtained by dividing the inside of the frame 14 into a plurality of parts in the vertical and horizontal directions, and the auxiliary concrete block 28 is further smaller, so that the concrete blocks 20, 22, and 28 are small and light. It can be greatly facilitated to carry into the existing building. Further, since the first recesses 20a, 22a, 28a and the second recesses 20b, 22b, 20b are formed in spatial volumes s1, s2 that can accommodate the vertical stripes 16 and the horizontal stripes 18, these first recesses 20a. , 22a, 28a and the second recesses 20b, 22b, 28b can be filled with a small amount of mortar. For this reason, the mortar can be covered with an amount produced by kneading on-site, and there is no need to procure concrete from a plant factory. Accordingly, the work can be continued even on a holiday when the work performed in the existing building is stopped, and the work for adding a seismic wall can be efficiently performed without being restricted by the work schedule. In addition, since the amount of mortar used is small, the curing period is shortened and the construction period is shortened. From this point as well, the obstacles to the work in the building are reduced as much as possible.
[0021]
By the way, in this embodiment, since the horizontal bars 18 are provided in the middle part in the vertical direction of the frame 14, a concrete block 22 in which the horizontal bars 18 are embedded in the concrete block 20 in a general part is used at the position where the horizontal bars 18 are provided. However, the transverse bars 18 may be arranged in each step using the concrete block 22 as a general part. In this case, the strength of the earthquake-resistant wall 21 can be further increased. Of course, when the horizontal bars 18 are arranged for each stage in this way, the post-construction anchors 26 are hit on the pillars 10 correspondingly.
[0022]
FIGS. 5 to 11 show a second embodiment of the present invention, FIG. 5 is a perspective view of one concrete block, FIG. 6 is a front view showing a mounting state of the concrete block, and FIG. 7 is a lamination state of the concrete block. FIG. 8 is a plan view showing an end of the laminated concrete block, FIG. 10 is a side view of the laminated concrete block, and FIG. 11 is a side view of the laminated concrete block. It is a principal part top view which shows an example in the case of forming a corner | angular part with a concrete block.
[0023]
That is, in the concrete block 50 of this embodiment, as shown in FIGS. 5 and 6, the first recesses 50 a and 50 b provided at the left and right end portions are such that the first recess 50 a on one side is opened to the front surface, and the other The first recess 50b is formed in a shape that is open to the rear surface, and the second recesses 50c and 50d are formed in a shape that is recessed in the upper and lower ends. Further, the vertical streak 52 and the horizontal streak 54 are inserted and arranged in the first concave portions 50a and 50b and the second concave portions 50c and 50d, respectively, as a set of two parallel bars.
[0024]
As shown in FIGS. 7 to 11, the concrete block 50 accommodates the vertical streak 52 and the horizontal streak 54 in the first concave part 50a and the second concave part 50b, while facing upward from the lower layer in the frame frame not shown. And stack. At this time, as shown in FIG. 6, one horizontal streak 54 is disposed in each of the second recesses 50 c and 50 d of one concrete block 50. Further, it is desirable to adjust the height by arranging an adjuster 56 at the lower end where the concrete blocks 50 are to be laminated as shown in FIG. Furthermore, the first recesses 50a and 50b of the concrete block 50 arranged at the lateral end may cover the open front or rear surface with a lid 58 as shown at the left end in FIG. Moreover, you may form in a cross-sectional U-shape so that a front surface and a rear surface may be covered as shown to the right end part in the figure.
[0025]
Therefore, even in this embodiment, the concrete blocks 50 are stacked while the vertical bars 52 and the horizontal bars 54 are housed in the first recesses 50a and 50b and the second recesses 50c and 50d, and the first recesses 50a and 50b and The seismic wall 59 can be constructed by filling the second recesses 50c and 50d with mortar. Thus, even in this embodiment, the formwork can be eliminated, the concrete block 50 is reduced in size and weight, and the spatial volumes of the first recesses 50a and 50b and the second recesses 50c and 50d are reduced. Therefore, the amount of mortar used can be reduced.
[0026]
Of course, even in this embodiment, the vertical bars 52 and the horizontal bars 54 are connected to anchors post-placed on beams and columns. Further, the number of the horizontal bars 54 can be reduced or eliminated from the strength required for the earthquake resistant wall 59. By the way, when laminating the concrete block 50, it is desirable to provide a decorative joint by providing a slight gap between the vertically adjacent left and right ones.
[0027]
Moreover, as shown in FIG. 11, when it is necessary to form a corner | angular part in the earthquake-resistant wall 59, the 1st recessed part 50a of the one side of the concrete block 50 and the 1st recessed part 50b of the other side are joined at right angle. It is desirable that one of these recesses is formed in a U-shaped cross section and the lid body 58 is disposed in the other recess.
[0028]
12 and 13 show a third embodiment of the present invention, FIG. 12 is a perspective view of a concrete block, and FIG. 13 is a process diagram showing the lamination of the concrete blocks in order from (a) to (d).
[0029]
That is, in this embodiment, a solid concrete block 60 in which the first concave portion 60a is formed at the left and right end portions and the second concave portion 60b is formed at the lower end portion is formed as a pair of left and right columns as shown in FIG. The housing frame 66 formed between the upper and lower beams 62 and the pair of upper and lower beams 64 is formed in advance in a size that is divided into a plurality of parts vertically and horizontally, and the concrete block 60 is laminated inside the housing frame 66. Incidentally, in this embodiment, the concrete block 60 is formed with a height h1 = 200 mm, a lateral width L = 400 mm, and a depth w1 = 200 mm. Of course, the first recess 60a is formed to have a spatial volume enough to accommodate the vertical stripes 68, and the second recess 60b is also formed to have the same spatial volume.
[0030]
When laminating the concrete block 60, first, as shown in FIG. 13A, an engraving 64a having a wall thickness is provided on the opposite surface of the beam 64 by a water jet or “hanger”. The depth of the engraving 64a in this case is preferably such that stirrup appears. Then, as shown in FIG. 4B, the connecting bars 70 are projected by anchoring to the engraving 64a of the upper and lower beams 64. At this time, it is necessary to drive anchors while avoiding stirrups and main bars of the beam 64. Next, as shown in FIG. 6C, the concrete blocks 60 are stacked while the vertical bars 68 are housed in the first recesses 60a, and the first recesses 60a and the second recesses 60b are filled with mortar. Then, as shown in FIG. 4D, when the concrete block 60 is stacked up to the vicinity of the upper beam 64, mortar is pressed into the gap between the upper concrete block 60 and the beam 64 to fill it. Yes.
[0031]
Therefore, even in this embodiment, the mold can be eliminated, the concrete block 60 is reduced in size and weight, and the first recess 60a and the second recess 60b are formed with a small spatial volume, so that the mortar. The amount of use can be reduced.
[0032]
【The invention's effect】
Claims 1 and Walls In the expansion method and shear wall that is added to an existing building, the size obtained by dividing the skeleton frame into a plurality of vertical and horizontal directions to an existing building shown in 3 of the present invention as described above The concrete block formed on the right and left ends of the concrete block is stacked in the first concave portion while accommodating the vertical stripes coupled to the anchor member provided on the beam member , and the grout is placed in the first concave portion. Since the seismic wall was constructed by filling the material, the concrete block is divided into multiple parts in the vertical and horizontal directions in the frame, so each concrete block can be reduced in size and weight, and it can be reduced in the existing building. Carrying in can be significantly facilitated. In addition, since the first recess is formed in a space volume enough to accommodate the vertical stripes, the amount of grout material used to fill the first recess can be greatly reduced. For this reason, since the amount of the grout material is small, it can be easily mixed on site, and there is no need to procure concrete from the plant factory. In addition, since the amount of the grout material is small, the curing period is shortened, so that the construction period can be shortened, and the trouble of the work accompanying the expansion work can be reduced as much as possible.
[0033]
Moreover, in the earthquake-resistant wall extension construction method to the existing building shown in Claim 2 of this invention, the horizontal stripe couple | bonded with the anchor member provided in the column member of a frame is provided in the upper-lower-end part of the said concrete block. 2 Since the concrete blocks are stacked while being placed in the recess and placed inside the frame, the grout material is filled in the second recess, so the amount of grout material used to fill the second recess There are various excellent effects that the strength of the seismic wall can be further increased while reducing the amount of vibration.
[Brief description of the drawings]
FIG. 1 is a front view in the middle of construction of a seismic wall according to a first embodiment of the present invention.
FIG. 2 is a plan view in the middle of construction of the earthquake-resistant wall showing the first embodiment of the present invention.
FIG. 3 is a perspective view of a concrete block used in the first embodiment of the present invention.
FIG. 4 is a view showing a front surface (a), a plane surface (b), and a side surface (c) of the concrete block used in the first embodiment of the present invention.
FIG. 5 is a perspective view of a concrete block used in the second embodiment of the present invention.
FIG. 6 is a front view of a concrete block attached state showing a second embodiment of the present invention.
FIG. 7 is a front view of a state in which concrete blocks showing a second embodiment of the present invention are laminated.
FIG. 8 is a plan view of an essential part of a laminated concrete block showing a second embodiment of the present invention.
FIG. 9 is a plan view showing a state where the end portions of the laminated concrete blocks are finished, showing a second embodiment of the present invention.
FIG. 10 is a side view of a laminated concrete block showing a second embodiment of the present invention.
FIG. 11 is a plan view of an essential part of an example in the case where corners are formed with a concrete block showing a second embodiment of the present invention.
FIG. 12 is a perspective view of a concrete block used in the third embodiment of the present invention.
FIGS. 13A to 13D are process diagrams sequentially illustrating the lamination of concrete blocks according to a third embodiment of the present invention from (a) to (d).
[Explanation of symbols]
10, 62 Columns 12, 64 Beams 14, 66 Frames 16, 52 Vertical bars 18, 54 Horizontal bars 20, 22, 50, 60 Concrete blocks 20a, 22a, 28a, 50a, 50b, 60a First recesses 20b, 22b, 28b , 50c, 50d, 60b Second recess 21, 59 Seismic walls 24, 26 Post-installed anchors 24a, 26a, 70 Connecting bars 28 Auxiliary concrete block

Claims (3)

The inside of the frame surrounded by the column member and the beam member is formed in a size that is divided into a plurality of portions in the vertical and horizontal directions, and a first recess having a spatial volume enough to store the vertical streak is provided at the left and right ends thereof. concrete blocks preformed, the beam member of the skeleton frame in providing the anchors member couples the vertical line to the anchor member, while the vertical line is accommodated in the first recess, said plurality of said concrete block An existing structure characterized in that the first recesses are stacked so that the first recesses are aligned in the vertical direction from the bottom to the top in the frame, and then the grout material is filled into the first recesses of the stacked concrete blocks. Construction method for adding earthquake resistant walls to buildings.   A second recess having a space volume sufficient to store a horizontal stripe is provided at the upper and lower ends of the concrete block, an anchor member for connecting the horizontal stripe is provided to a column member of the frame, and the horizontal stripe coupled to the anchor member 2. The concrete block according to claim 1, wherein the concrete block is laminated while the second concave portion is housed in the second concave portion, and the grout material is filled in the second concave portion. A method for expanding seismic walls to existing buildings. The inside of the frame surrounded by the column member and the beam member is formed in a size that is divided into a plurality of parts in the vertical and horizontal directions, and a first recess having a spatial volume enough to store the vertical streak is provided at the left and right ends thereof. A concrete block is formed in advance, an anchor member is provided on the beam member of the frame, the vertical bars are coupled to the anchor member, and the vertical bars are accommodated in the first recesses, and a plurality of the concrete blocks are stored in the frame. In the frame, the first recesses are stacked so that the first recesses are aligned in the vertical direction from the lower stage to the upper stage, and then the grout material is filled in the first recesses of the stacked concrete blocks. Seismic walls to be added to existing buildings.

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