JPH10159350A - Reinforcement wall for existing building, and its constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement wall for an existing building and its constructing method capable of making advantage of using block, and capable of reducing the weight. SOLUTION: A reinforcement wall 10 is constructed on a shaft part of a building provided with the shaft part comprising two struts and at least beams 20, 22. The reinforcement wall 10 comprises an anchor rod which is fitted to the beams 20, 22 and projected into a space 24 to be surrounded by the struts and the beam, a plurality of blocks 14 comprising the ready-made light material which is stacked in the vertical direction and arranged in the space 24, a reinforcing bar 16 to be arranged so as to surround the block 14, a placing mold 18 to be arranged so as to surround the reinforcing bar 16, and the mortar which is poured into a gap between the placing mold 18 and the block 14 to embed the anchor rod 12 and the reinforcing bar 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reinforcing wall for an existing building and a method for constructing the same, and more particularly to a reinforcing wall suitable for reinforcing an existing building made of reinforced concrete, steel reinforced concrete or steel concrete, and a method of constructing the same.

[0002]

2. Description of the Related Art In a building provided with a shaft composed of a pillar and a beam, a block wall is formed in a space surrounded by the pillar and the beam, and a connecting beam is arranged on the top of the wall. A method of reinforcing an existing building in which the ends are joined to pillars has been proposed (JP-A-55-55774).

[0003]

The blocks used in the above-mentioned reinforcing method have to be strong and rigid enough to withstand seismic force, so that the weight per unit is heavy, and therefore, the blocks are constructed using the blocks. Due to the weight of the walls, the load on the lower floor beams and foundations of the building increases. This limits the practice of building reinforcement methods by using blocks.

The present invention provides an existing reinforcing wall for a building and a method of constructing the same, which can make use of the advantages of using a block and reduce the weight.

[0005]

SUMMARY OF THE INVENTION The present invention is a reinforcing wall constructed on a shaft of a building having a shaft composed of two columns and at least one beam. The reinforcing wall is attached to the beam, and an anchoring bar projecting into a space surrounded by the column and the beam, and a prefabricated reinforcing bar arranged vertically so as to substantially fill the space in a vertical direction. A plurality of blocks made of a lightweight material, a reinforcing bar arranged so as to surround the block, a driving formwork surrounding the reinforcing bar, and a distance between the driving formwork and the block And mortar injected into the mortar to fill the anchor and reinforcement.

When a seismic load is applied to a building, the seismic load is transmitted to the reinforcing wall via columns and beams. In the reinforcing wall, seismic loads are received by the reinforcing bars and the anchor bars attached to the beams and the mortar in which the reinforcing bars are embedded.

[0007] The rigidity of the reinforcing wall increases as its horizontal sectional area increases. However, according to the reinforcing wall according to the present invention, the block can be used as a core so as to have a large horizontal sectional area. Can have high rigidity. Because of this and the reinforcing bars surrounding the anchor bars and the blocks attached to the beams, sufficient strength can be achieved.

[0008] Since the block is made of a lightweight material, the weight of the entire reinforcing wall can be kept low despite having a large horizontal sectional area. Further, since the block exists as a core material, the amount of mortar to be injected can be reduced. Efficient construction of reinforced walls is possible because blocks that are ready-made at the factory can be used as the blocks and the driving formwork can be used as a part of the wall as it is and there is no need to remove it after the mortar is cured. Can be.

The present invention is also a method of constructing a reinforcing wall on a shaft of a building having a shaft comprising two columns and at least one beam. First, an anchor bar is attached to the beam so as to cover a predetermined length in the axial direction of the beam, and the beam is projected into a space surrounded by the column and the beam. Next, a plurality of blocks made of ready-made lightweight materials are placed one on top of the other in the vertical direction, and the space is substantially filled in the vertical direction. Thereafter, reinforcing bars are arranged so as to surround the block. A driving form is arranged so as to surround this reinforcing bar, and the driving form is held in a fixed state. Then, mortar is injected into a space between the driving form and the block, and the anchor bar and the reinforcing bar are buried in the mortar.

Since the mortar is merely injected into the space between the driving form and the block, the reinforcing wall can be constructed with a small amount of mortar. In addition, anchor bars projecting into a space surrounded by the two columns and beams, a plurality of blocks that substantially fill the space in the vertical direction, reinforcing bars surrounding the blocks, and driving around the reinforcing bars It is to build a so-called reinforcing wall unit with the formwork, and since this reinforcing wall unit is independent from the reinforcing wall unit located adjacent to, a plurality of reinforcing wall units are connected in a horizontal direction and built, In addition to being able to construct a stiffening wall that spans the entire space, the stiffening wall can be constructed to leave a portion of the space for passage or other uses.

The block has a hole penetrating in a direction substantially perpendicular to an imaginary plane including the axis of each of the two columns, and the driving form is inserted into the hole of the block to A bolt having threads at both ends extending through the driving form and fixed by a jig arranged outside the driving form substantially parallel to the imaginary plane and coupled to the bolt. It is preferable to be kept in a state.

One end of the bolt inserted into the hole of the block is penetrated through a driving form located on one side with respect to the imaginary plane, and is connected to an outer jig. The driving form is located on the other side with respect to the imaginary plane, and is penetrated to be connected to an outer jig, so that the driving form is fixed. When mortar is injected in this fixed state,
Bolts are embedded in the mortar. After the mortar has hardened, remove the jig.

Although a jig exists outside the driving formwork, the jig may have a thickness enough to allow a screw of a bolt to pass therethrough, and can be formed sufficiently small. As a result, when constructing the reinforcing wall, it is possible to avoid inconvenience caused by the presence of obstacles that hinder the work or hinder the traffic of people outside the driving formwork.

[0014]

DETAILED DESCRIPTION OF THE INVENTION A stiffening wall is constructed on a shaft of an existing building having a shaft consisting of two columns and at least one beam. When the building is a one-story building, the shaft portion is composed of two pillars, one upper beam, and two pillars, two beams of an upper beam and a lower beam. Also,
When the building has two or more floors and a plurality of floors, the shaft portion on the upper floor of the building is composed of two pillars and two beams above and below. The reinforcing wall according to the present invention can be applied to the shaft of any building.

[0015] When the building has an upper beam, the anchor bar is attached to the upper beam and protrudes downward into a space surrounded by two columns and one beam. If the building has an upper beam and a lower beam, the anchor bars are attached to the upper beam and the lower beam, respectively, and two columns and two beams are provided.
It projects downward from the upper beam and upward from the lower beam into the space surrounded by the two beams.

[0016] A plurality of blocks made of lightweight material are arranged in a vertical direction so as to substantially fill the space in the vertical direction. The block has a specific weight of 1.2 to 1.4ton / m
^3. Can be mass-produced in factories using lightweight concrete. Since lightweight concrete has poor fluidity and has a property that the strength tends to vary when vibration is applied, it is not advisable to construct the entire reinforcing wall using lightweight concrete. However, in the reinforcing wall according to the present invention, the block functions as a core material of the reinforcing wall, and the seismic load is taken up by the mortar, the reinforcing bars, and the anchor bars outside the block. No problem. The block can be formed in a rectangular parallelepiped shape of, for example, 300 × 200 × 100, and when made of lightweight concrete having a specific weight of 1.2 ton / m ³ , the total weight of each block is 7.2 kgf. The blocks may be provided with a concave portion on the top surface and a convex portion on the bottom surface for the convenience of stacking a plurality of blocks in the vertical direction. The concave portion and the convex portion have a dimensional relationship such that the convex portion on the bottom surface of another block disposed above one block fits into the concave portion on the top surface of the one block. The blocks can also be made using foam.

The block is surrounded by reinforcing bars such as a wire mesh, and a driving form is arranged so as to surround the reinforcing bars. The driving formwork is formed, for example, by mixing carbon fiber into mortar and extruding it, and is available from Showa Denko Kenzai Co., Ltd. under the trade name of "ACE panel". It is preferable that the mortar injected into the space between the driving form and the block to fill the anchor streaks and the reinforcing streaks is a high-strength non-shrink mortar.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A reinforcing wall 10 is constructed on a shaft of a building having a shaft consisting of two pillars and at least one beam, and shows a perspective view in FIG. 1 and a sectional view. Referring to FIG. 2, an anchor bar 12, a plurality of blocks 14, a reinforcing bar 16, and a driving form 18 are provided.

In the embodiment shown, the anchor bars 12 are attached to the upper beam 20 and the lower beam 22, respectively.
In a space 24 surrounded by the pillars and the beams, they protrude downward from the beams 20 and upward from the beams 22. The anchor bars 12 are to be implanted in beams 20 and 22 of an existing building by post-processing, and are arranged at positions deviating from blocks 14 described later, as shown in FIG. That is, the axis of the beam is such that there is one group of anchor bars 12 on one side of the block 14 in the axial direction of the beams 20,22 and another group of anchor bars 12 on the other side of the block 14 in the axial direction. Block 14 in direction
Place in consideration of the length of

The plurality of blocks 14 are arranged in a vertical direction so as to substantially fill the space 24, that is, from the lower beam 22 to the upper beam 20. The block 14 is a ready-made one manufactured at a place different from the site where the reinforcing wall 10 is to be constructed, and is made of lightweight concrete. The block 14 functions as a core material of the reinforcing wall 10, and may be a rectangular parallelepiped or a cube.
Further, in addition to a hollow type having a hole penetrating in the vertical direction, a solid type without a hole can be used, but it is preferable that the device be formed small in consideration of transportation convenience.

The block 14 shown in FIG. 3 is a solid rectangular solid type as a whole, having a concave portion 26 on the top surface and a convex portion 28 on the bottom surface. The concave portion 26 and the convex portion 28 have a dimensional relationship such that when another block of the same shape and size is overlaid on the block 14, the convex portion of another block fits into the concave portion 26 of the block 14. The positions of the blocks superimposed on each other are determined to prevent the blocks from shifting. Block 1 shown
4 further includes a plurality of recesses 31 on the front surface 30 and a plurality of recesses 33 on the side surface 32, and a recess on the rear surface parallel to the front surface 30 and another side surface parallel to the side surface 32. A through hole 34 for a bolt is formed horizontally from the front surface 30 to the rear surface. In the illustrated embodiment, block 1
4. The dimensions of A, B and C are 300mm, 200mm and 100mm respectively.
It is. The blocks 14 are arranged in the space 24 so that the front surface 30 is parallel to the beams 22, and are superposed one by one. It is not necessary that the plurality of superimposed blocks 14 be fixed to each other.

When a plurality of blocks 14 are overlapped, there may be a gap between the uppermost block 14 and the upper beam 20. This clearance is smaller than the height of one block, and can be filled with mortar described later.
Reinforcing bars 16 surrounding the plurality of superposed blocks 14 are provided with a plurality of reinforcing bars 3 arranged vertically at a lateral interval.
6 and a plurality of reinforcing transverse bars 38 which are horizontally arranged at intervals in the vertical direction and are mutually connected to the main reinforcing bars 36.

The driving form 18 is arranged so as to surround the reinforcing bar 16. In the embodiment shown in FIG.
8 is a front mold 40 and a rear mold 42 of substantially the same shape and size.
And two side dies 44, and the two side dies 44 are sandwiched between the front die 40 and the rear die 42. Accordingly, by fixing the front mold 40 and the rear mold 42 with the bolts 46, the driving form 18 is held in a fixed state, and the mortar 48 is injected into the space between the driving form 18 and the block 14. it can. The mortar 48 embeds the anchor bar 12 and the reinforcing bar 16 and integrally connects the block 14 and the driving form 18. In order to ensure the connection between the mortar 48 and the driving form 18, irregularities are provided on the inner surface of the driving form 18.

Referring to FIGS. 4 to 7 schematically showing a method of constructing the reinforcing wall, an axis including two columns (only one is shown in the drawing) 50 and at least one beam 20 is shown. A reinforcing wall is constructed on the shaft portion 52 of a building having the portion 52. In the illustrated embodiment, the shaft 52 is attached to the lower beam 22.
It is included.

First, the anchor bars 12 are attached to the beams 20 and 22 so as to extend over a predetermined length in the axial direction of the beams 20 and 22, and are protruded into a space 24 surrounded by the columns 50 and the beams 20 and 22 (FIG. 4). Here, the predetermined length is, as described with reference to FIGS. 1 and 2, a group of anchor bars on each side of the block 14 in the axial direction of the beam, and one reinforcing wall 10 Since two groups of anchor bars 12 are required, the length can be determined in consideration of the length of the block 14 in the axial direction of the beam and the size occupied by the group of anchor bars 12.
In FIG. 4, anchor bars 12 are attached to the beams to construct three reinforcing walls.

After the anchor bars 12 are attached to the beams 20 and 22, a plurality of blocks 14 made of ready-made lightweight materials are arranged vertically one above the other, and the space 24 is substantially filled in the vertical direction (FIG. 5). . Next, reinforcing bars are arranged so as to surround the block 14 (FIG. 6). After that, reinforcing bars 16
Is placed so as to surround the frame, and the driving form 18 is held in a fixed state (FIG. 7). Driving formwork 18
Has a certain length in which the cross-sectional shape shown in FIG. 2 is continued in the axial direction.

As shown in FIG. 3, the block 14 has a hole 34 penetrating in a direction substantially orthogonal to an imaginary plane including the axis of each of the two columns. Therefore, the driving form 1
A hole is made in a portion facing the hole 34 of No. 8. In this case, it is not necessary that the hole of the driving form 18 is opposed to the hole of each of the blocks 14 that are superimposed. For example, the driving form 18 is opposed to any of the holes of the two blocks 14.
The position of the hole to be drilled in the driving formwork 18 can be selected such that the one hole of the hole faces the other. The driving formwork 18 thus formed is, as shown in FIG.
A bolt 46 having threads at both ends, which is inserted into said hole and extends through the driving form 18, and a bolt 46 disposed outside the driving form 18 so as to be substantially parallel to the imaginary plane; And can be held in a fixed state by the jig 54 coupled to the second member. The jig 54 can be formed of two straight bars, and is formed of two straight bars having a U-shape in plan view and a connecting material connecting these bars. be able to. Forming bar 1
8, the end of the bolt 46 is penetrated through the bar, and the nut 56 is screwed into the screw to form the driving form 18.
Is fixed.

After the driving form 18 is fixed, high-strength non-shrinkable mortar is injected into the space between the driving form 18 and the block 14, and the anchor muscle 12 and the reinforcing muscle 16 are buried in the mortar 48, and are driven. The formwork 18 and the block 14 are integrally connected. When the jig 54 is removed after the mortar 48 has hardened, the reinforcing wall 10 (FIGS. 1 and 2) is constructed.

In the above embodiment, one block 14 is arranged so that the horizontal dimension is longer than the vertical dimension.
In this form, a plurality of blocks 14 are overlapped to construct a reinforcing wall. Alternatively, one block 14 may be arranged so that the vertical dimension is longer than the horizontal dimension, and a plurality of blocks may be stacked in this form to construct a reinforcing wall. In this case, in order to prevent the width of the reinforcing wall in the axial direction of the beam from becoming small, one block is formed by two rows of blocks which are vertically overlapped and arranged adjacent to each other.
You only need to build one reinforcement wall.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of an embodiment of an existing building reinforcing wall according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of an embodiment of the block.

FIG. 4 is a schematic diagram showing a method for constructing an existing building reinforcing wall according to the present invention.

FIG. 5 is a schematic view showing a method for constructing an existing building reinforcing wall according to the present invention.

FIG. 6 is a schematic view showing a method of constructing an existing building reinforcing wall according to the present invention.

FIG. 7 is a schematic view showing a method for constructing an existing building reinforcing wall according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforcement wall 12 Anchor bar 14 Block 16 Reinforcing bar 18 Driving form 20, 22 Beam 24 Space 50 Column 52 Shaft

Continuing on the front page (72) Inventor Koichi Sato 1043 Oga Onigabo, Tsukuba-shi, Ibaraki Pref. Inside the Kumagaya Gumi Technical Research Institute Co., Ltd. In-house (72) Inventor Hideki Koyama 1043 Oga Onigabo, Tsukuba, Ibaraki Pref.

Claims (3)

[Claims] 1. A reinforcing wall constructed on a shaft of a building having a shaft composed of two columns and at least one beam, the reinforcing wall being attached to the beam and surrounded by the column and the beam. Anchor blocks protruding into the space to be formed, a plurality of blocks made of ready-made lightweight materials that are arranged in a vertically overlapping manner so as to substantially fill the space in the vertical direction, and are arranged so as to surround the blocks. And a mortar that is injected into the space between the driving form and the block to fill the anchor and the reinforcement. , Reinforced walls for existing buildings. 2. A method of constructing a reinforcing wall on a shaft of a building having a shaft comprising two columns and at least one beam, the reinforcing wall being provided over a predetermined length in the axial direction of the beam. Attaching an anchor bar to the beam and projecting it into a space surrounded by the column and the beam; arranging a plurality of blocks made of a ready-made lightweight material in an up-down direction so that the space is substantially vertical; Arranging a reinforcing bar so as to surround the block, arranging a driving form so as to surround the reinforcing bar, and holding the driving form in a fixed state; and the driving form and the block. Mortar is injected into the space between the mortar and the anchoring bar and the reinforcing bar are buried in the mortar. 3. The block has a hole penetrating in a direction substantially orthogonal to an imaginary plane including an axis of each of the two columns, and the driving form is inserted into the hole of the block. A bolt having threads at both ends, extending through the driving form, and a jig arranged outside the driving form so as to be substantially parallel to the virtual plane and coupled to the bolt. The method for constructing an existing building reinforcing wall according to claim 2, wherein the building is held in the fixed state.