JP5794550B1 - Reinforcement structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure for a building capable of fixing an axial streak without obtaining an anchor in an existing column or the like and obtaining a sufficient reinforcing strength. A specific one or a plurality of successive floors in an intermediate floor of a multi-layer floor are designated as reinforcement target floors B and C, and from above a non-reinforcement target floor A below the reinforcement target floors B and C to above the reinforcement target floor. The periphery of the pillar 1 that continues to the non-reinforcing target floor D is surrounded by the surrounding steel plate 12 in each floor from the lower non-reinforcing target floor A to the upper non-reinforcing target floor D. The grout material 16 is filled between the upper slab and the lower slab of the floor to be reinforced, and continues from the lower non-reinforcing floor A to the upper non-reinforced floor D. An axial streak 19 is embedded, and a lower end 19a and an upper end 19b of the axial streak are in an unfixed state in the grout material 16 provided on the lower non-reinforcing floor A and the upper non-reinforcing floor D, respectively. It was configured to be positioned. [Selection] Figure 1

Description

  The present invention relates to a reinforcing structure for retrofitting an existing building provided with concrete columns.

2. Description of the Related Art Conventionally, there is known a reinforcing structure for a building that later reinforces a concrete column.
This reinforcing structure surrounds the outside of an existing concrete column with a surrounding steel plate with a gap, and fills the grout material between the surrounding steel plate and the column to make it a thick column, and the column is placed inside the grout material. The axial direction stripe | line along the axial direction of this is arrange | positioned (patent document 1). Then, the upper and lower ends of the axial streak are respectively embedded and fixed in a slab or foundation on the beam.

However, in a multi-story building, not all floors must be reinforced in the same way. For example, depending on the building, it may be found that the strength of a specific floor is insufficient afterwards. In such a case, a reinforcing method shown in FIG. 6 is considered as a method for reinforcing only the required floor.
The conventional reinforcing method shown in FIG. 6 is a reinforcing structure that reinforces an existing column 1 only on a floor that needs reinforcement, and the portion to be reinforced is a slab 4 on the ceiling side above the beam 3 from the slab 2 on the floor surface side. Until.
Between the slab 2 and the slab 4, a surrounding steel plate 5 is provided around the column 1 with a space therebetween, and a beam steel plate (not shown) is also provided at the beam 3 portion with a space therebetween. And the grout material is filled into the inside of these enclosure steel plates 5 and the enclosure steel plates for beams.
In FIG. 6, the front side of the enclosure steel plate 5, the enclosure steel plate for beams and the grout material inside are omitted.

Further, axial streaks 6 extending from the floor-side slab 2 to the ceiling-side slab 4 are arranged in the grout material.
Plate nuts 7 and 8 are attached to the upper and lower ends of the axial stripe 6. Then, the upper end of the axial streak 6 is held by a grout material covering the beam 3 via the plate nut 7, and the axial streak 6 placed on the upper surface of the floor-side slab 2 via the plate nut 8. Is held by a grout material filled in the surrounding steel plate 5.
In addition, as shown in FIG. 6, the recessed part 9 surrounding the said pillar 1 is formed in the upper surface of the slab 2. As shown in FIG. By positioning the standing outer peripheral surface of the enclosed steel plate 5 in contact with the inner wall of the recessed portion 9, the enclosed steel plate 5 is positioned and prevented from being displaced.

Then, in order to fix the lower end of the axial streak 6 on the slab 2, a plurality of axial anchors 10 are driven on the slab 2 and a lateral anchor 11 is also driven on the surface of the column 1.
Although not shown, in order to fix the upper end of the axial streak 6, the vertical anchor 10 is driven into the slab 4 on the ceiling side, and the horizontal anchor 11 is driven into the surfaces of the column 1 and the beam 3.
These anchors 10 and 11 increase the adhesiveness between the grouting material filled inside the enclosure steel plate and the slabs 2 and 4, the column 1 and the beam 3, and as a result, upper and lower end portions of the axial streak 6 in the grouting material. Can be fixed to make it difficult to shift.

FIG. 5 of JP2008-240368A

In the conventional reinforcing structure shown in FIG. 6, a number of longitudinal anchors 10 are added to an existing structure such as the pillar 1, the beam 3, and the slabs 2 and 4 in order to maintain the axial streaks arranged only on a specific floor. And the transverse anchor 11 must be driven.
However, depending on the existing structure, if a large number of anchors are driven afterwards, the structure may be damaged and the strength may be lost. When the anchor cannot be driven in this way, the end portion of the axial streak cannot be fixed, so that sufficient reinforcing strength may not be obtained.
An object of the present invention is to provide a reinforcing structure for a building that can fix an axial streak and obtain a sufficient reinforcing strength without driving an anchor into an existing column or the like.

  1st invention makes the specific 1 or several continuous floor in the intermediate | middle floor of a multilayer floor into a reinforcement object floor, and the non-reinforcement object floor above the said reinforcement object floor from the non-reinforcement object floor under this reinforcement object floor The surrounding pillars are surrounded by a surrounding steel plate on each floor from the lower non-reinforcement target floor to the upper non-reinforcement target floor, and a grout material is filled between the surrounding steel plate and the above-mentioned pillars. An axial streak that passes through the upper slab and the lower slab of the floor to be reinforced in the material and continues from the lower non-reinforcing floor to the upper non-reinforcing floor is embedded, and the lower end of this axial streak The upper end and the upper end are positioned in a non-fixed state in the grout material provided on the lower non-reinforcing floor and the upper non-reinforcing floor, respectively.

The non-fixed state of the end portion of the axial streak is a state where the end portion of the axial streak is not fixed so as not to be displaced in the axial direction and the direction perpendicular thereto with respect to the slab. When an earthquake force occurs, the end side of the non-fixed axial streak may be separated from the column.
On the other hand, the fixed state of the axial streak is a state in which the end of the axial streak is held so as not to shift in the axial direction and the direction orthogonal thereto.

  According to a second aspect of the present invention, the upper end of the portion corresponding to each of the reinforcement target floors in the axial reinforcement is held by a grout material in an enclosed steel plate arranged on the floor above the reinforcement target floor, The lower end of the portion corresponding to each floor to be reinforced is configured to be held by a grout material in an enclosed steel plate arranged on the floor below the floor to be reinforced.

  The third invention is characterized in that a predetermined distance is maintained between the lower end of the enclosure steel plate provided on the lower non-reinforcing floor and the slab facing the lower end.

  The fourth invention is characterized in that a predetermined interval is maintained between the upper end of the surrounding steel plate provided on the floor to be reinforced and the beam facing the upper end.

According to the first invention, the upper and lower ends of the axial line corresponding to the reinforcement target floor can be held and fixed by the grout material provided on the upper and lower non-reinforcement target floors of the reinforcement target floor. Therefore, in order to fix the axial streak, it is not necessary to drive anchors for holding both ends of the axial streak into existing structures such as columns, beams, and slabs on the floor to be reinforced. Therefore, even when the anchor cannot be driven, the reinforcement target floor can be sufficiently reinforced.
In addition, in the upper and lower non-reinforcing floors, a certain degree of reinforcing effect can be expected because the columns are surrounded by the surrounding steel plates and grout materials. In the upper and lower non-reinforcing floors, one end of the axial streak is in an unfixed state, so that part may be displaced when an earthquake occurs. Therefore, the non-reinforcing target floor cannot obtain the same reinforcing strength as the reinforcing target floor, but, for example, the strength of about 50% of the reinforcing strength of the reinforcing target floor can be obtained, and the strength of the entire building can be increased. .

  According to the second invention, both ends of the axial streak corresponding to each reinforcement target floor are held by the grout materials on the upper and lower floors of the reinforcement target floor. For example, when the floors to be reinforced cover multiple floors, the grout material on one floor of the floors to be reinforced continuously exhibits the function of holding the axial streak corresponding to the other floor, There is no need to drive anchors on the floor.

According to the third invention, since the slab facing the enclosure steel plate on the lower end side of the axial streak is separated, even when a deviation occurs between the enclosure steel plate and the slab due to an earthquake or the like, The slab does not press and destroy the surrounding steel plate.
According to the fourth aspect of the invention, since the beam facing the upper end of the surrounding steel plate on the upper end side of the axial streak is separated, even when a deviation occurs between the surrounding steel plate and the beam due to an earthquake or the like. The beam does not press and destroy the surrounding steel plate.
When the enclosure steel plate is destroyed, the enclosing force of the enclosure steel plate with respect to the grout material is lost, so that the internal grout material collapses. However, in the third and fourth inventions, the surrounding steel plate can be prevented from being destroyed by the slab or the beam, so that the grout material can be prevented from collapsing.

FIG. 1 is a front view of a state in which the front portion of the enclosure steel plate of the first embodiment is omitted. FIG. 2 is a perspective view of a specific reinforcement target floor according to the first embodiment. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a front view of a state in which the front portion of the enclosure steel plate of the second embodiment is omitted. FIG. 5 is a cross-sectional view of the third embodiment. FIG. 6 is a front view showing a state in which the front portion of the conventional steel plate is omitted.

1st Embodiment shown in FIGS. 1-3 makes intermediate floors B and C among the continuous 4 floors A to D the reinforcement target floor, and the lowermost floor A of the above four floors is the lower non-reinforcement target floor. This is a reinforcing structure in which the top floor D is reinforced as the upper non-reinforcing target floor.
As shown in FIG. 1, a pillar 1 to be reinforced is a concrete pillar penetrating all floors A to D.
In the first embodiment, in each floor A to D, the periphery of the pillar 1 is surrounded by a surrounding steel plate 12 while maintaining a space, and the beams 13a to 13c of the floors A to C are also spaced and used for beams. The surrounding steel plate 14 is provided, and the grout material 16 is filled therein.
In addition, the codes | symbols 15a-15e in FIG. 1 are slabs.

In the floor B to be reinforced, the floor side slab 15b to the beam 13b and in the floor C to be reinforced the slab 15c to the beam 13c are surrounded by the steel plates 12 and 14, but the lower non-reinforcing floor In A, the interval s1 is maintained between the lower end of the enclosure steel plate 12 and the floor-side slab 15a, and in the upper non-reinforcing floor D, the interval s2 is maintained between the upper end of the enclosure steel plate 12 and the beam 13d. I have to.
As described above, in the lower non-reinforcing floor A, the gap s1 is maintained at the lower end of the enclosure steel plate 12, so that when the grout material 16 is filled in the enclosure steel plate 12, the bottom surface of the enclosure steel plate 12 is pressed. A sealing member (not shown) is provided below the surrounding steel plate 12 so as to prevent the grout material 16 from flowing out at the interval s1. When the grout material 16 is solidified, the sealing member is removed.

In addition, in this 1st Embodiment, as shown in FIG. 2, the axial direction length of the said surrounding steel plate 12 is made shorter than the length of the pillar 1 part enclosed in each floor, and the some steel plate 12 is made into an up-down direction. They are stacked and arranged around the pillar 1. However, the enclosure steel plate 12 may not be divided in the axial direction.
Further, as shown in FIG. 3, the enclosure steel plate 12 is composed of four unit steel plates having an L-shaped cross section, and the ends of the unit steel plates are overlapped to surround the entire circumference of the column 1. Yes. However, the shape of the reinforcing steel plate 12 is not limited to that of four members, and any shape may be used as long as it can surround the pillar 1.

Further, the steel plate 14 for beams provided on the reinforcement target floors B and C and the lower non-reinforcement target floor A includes stop portions 14a on both the left and right sides of the U-shaped enclosure as shown in FIG. This stopper 14 a is fixed to the beam 13 with a set screw 17. FIG. 2 is a view in which the slab is omitted. In this figure, the beams 13 a to 13 c on each floor are represented as beams 13.
In the first embodiment, the width of the beam steel plate 14 is larger than the width of the wall steel plate 12 surrounding only the column 1 portion. You may make it equivalent to the enclosure steel plate 12. FIG. Moreover, you may comprise the said surrounding steel plate 14 for beams with several unit steel plates, such as a pair of unit steel plates with a L-shaped cross section, for example.

Furthermore, although omitted in FIG. 1, in this first embodiment, a belt-like sheet 18 is bonded to the surfaces of the surrounding steel plates 12 and 14 (see FIGS. 2 and 3). By bonding the belt-like sheet 18, the unit steel plates divided in the circumferential direction of the pillar 1 can be connected to each other, or the stacked surrounding steel plates 12 can be integrated in the vertical direction.
Moreover, if the strip | belt-shaped sheet 18 is affixed on the outer periphery of the enclosure steel plates 12 and 14, the tensile strength of the strip | belt-shaped sheet 18 can be added to the intensity | strength of the said enclosure steel plates 12 and 14. FIG.
Note that the unit steel plates that are continuous in the circumferential direction or vertically may be connected using welding, bolts, or the like instead of the belt-like sheet 18.

Inside the surrounding steel plates 12 and 14 arranged as described above, axial reinforcing bars 19 such as reinforcing bars are arranged along the four corners of the pillar 1 as shown in FIGS. These axial streaks 19 are continuous from the inside of the surrounding steel plate 12 of the lower non-reinforcing floor A to the inside of the surrounding steel plate 12 of the upper non-reinforcing floor D, and are formed in the slabs 15b, 15c, 15d on the intermediate floor. It penetrates the hole. The through hole formed in each slab is provided at a position where the axial streak 19 is arranged along the column 1 in a straight line.
Moreover, the lower end 19a of the axial direction reinforcement 19 is located above the lower end of the enclosure steel plate 12 of the lower non-reinforcement target floor A, and the upper end 19b of the axial direction reinforcement 19 is the enclosure steel plate of the upper non-reinforcement target floor D. 12 is positioned below the upper end of 12 (see FIG. 1). By setting the positions of the lower end 19a and the upper end 19b of the axial streak 19 as described above, when the grout material 16 is filled in the surrounding steel plate 12, the upper and lower ends 19b and 19a of the axial streak 19 are completely grouting. 16 will be covered.

Thus, if the axial direction stripe | line | wire 19 is arrange | positioned in the enclosure steel plates 12 and 14, the grout material 16 will be filled in the enclosure steel plates 12 and 14 of each floor, and it will solidify.
When the grout material 16 is solidified, the axial streak 19 is held by the grout material, and the lower end and the upper end of the axial streak 19 corresponding to the reinforcement target floors B and C are fixed.
Here, the fixation of the axial streak 19 indicates a fixed state where the axial streak 19 passes through the slab and does not shift in the axial direction and the direction perpendicular to the axis.

Specifically, the axial streak 19 arranged on the reinforcement target floor B is arranged below the floor side slab 15b on the lower non-reinforcement target floor A, which is the lower floor of the reinforcement target floor B. It is held by the grout material 16 in the surrounding steel plate 12, and the lower end of the axial streak 19 on the reinforcement target floor B is fixed at the penetrating position of the slab 15b.
Further, the upper end of the axial streak 19 in the reinforcement target floor B is held by the grout material 16 in the enclosure steel plate 12 arranged in the reinforcement target floor C, which is the floor above the reinforcement target floor B, and penetrates the slab 15c. It will be fixed at the position.

  Furthermore, the axial streak 19 on the reinforcement target floor C is also fixed in the same manner as the reinforcement target floor B. That is, the lower end of the axial streak 19 in the reinforcement target floor C is held by the grout material 16 in the enclosure steel plate 12 arranged on the reinforcement target floor B, which is the floor below the reinforcement target floor C, and the slab 15c. The upper end is held by the grout material 16 in the surrounding steel plate 12 arranged on the non-reinforcement target floor D, which is the upper floor of the reinforcement target floor C, and is at the penetration position of the slab 15d. It will be fixed.

In this way, on the floors B and C to be reinforced, the upper and lower sides of the axial streak 19 are held by the grout material 16 provided on the upper and lower floors, so that the columns are near the upper and lower ends as in the conventional example shown in FIG. Even if the vertical anchor 10 and the horizontal anchor 11 are not driven into a slab or the like, the axial streak 19 is fixed. Therefore, existing pillars 1 and the like are not damaged by driving a large number of anchors 10 and 11.
For this reason, the reinforcing structure of the first embodiment can be implemented even at a site where an anchor cannot be driven into an existing structure such as the pillar 1.

Further, in the lower non-reinforcing floor A, the pillar 1 and the beam 13a are surrounded by the steel plates 12 and 14, and the grout material 16 is filled with the axial streak 19 disposed on the inner side thereof. Floor A will also be reinforced.
However, in the non-reinforcing target floor A, the upper end side of the axial streak 19 is held by the grout material 16 provided in the reinforcing target floor B and fixed at the penetration position of the slab 15b as described above. The lower end 19a of the streak 19 is only positioned in the grout material 16 in the surrounding steel plate 12, and is not fixed. Therefore, for example, when an earthquake force is applied, the lower end 19a side of the axial streak 19 may be displaced, and the reinforcement strength equivalent to the reinforcement target floors B and C may not be obtained.

Further, the upper non-reinforcing floor D is also reinforced by the surrounding steel plate 12, the grout material 16, and the axial streak 19, but the upper end 19b of the axial streak 19 is not fixed, so the upper end 19b side may be shifted. Yes, the reinforcement strength equivalent to the reinforcement target floors B and C cannot be obtained.
In other words, in the reinforcing structure of the first embodiment, a certain degree of reinforcing strength is obtained even for the non-reinforcing target floors A and D, and by adding this strength, the strength of the entire building is increased. It can be made larger than the case where only B and C are individually reinforced.

Moreover, in this 1st Embodiment, the space | interval s1 is maintained between the lower end of the surrounding steel plate 12, and the floor side slab 15a in the lower non-reinforcing object floor A. Since such an interval s1 is maintained, even when a shift occurs between the lower end of the enclosure steel plate 12 and the floor slab 15a due to an earthquake or the like, the slab 15a presses and destroys the enclosure steel plate 12. There is no end.
Further, in the upper non-reinforcing floor D, an interval s2 is maintained between the upper end of the surrounding steel plate 12 and the beam 13d. Since such an interval s2 is maintained, even when a deviation occurs between the upper end of the enclosed steel plate 12 and the beam 13d due to an earthquake or the like, the beam 13d presses and destroys the enclosed steel plate 12. There is no.
When the enclosure steel plate 12 is destroyed, the grout material 16 inside collapses, so that the reinforcing structure is destroyed. However, as in the first embodiment, by keeping the distances s1 and s2 at the lower and upper ends of the surrounding steel plate 12, the surrounding steel plate 12 is prevented from being broken by the slab 15a and the beam 13d, and the reinforcing structure is maintained. To be.

Furthermore, the bonding area between the grout material 16 and the axial streak 19, that is, the holding length of the axial streak 19 varies depending on the length of the axial streak 19 in the surrounding steel plate 12 on the non-reinforcing floors A and D. If the holding length of the axial streak 19 on the non-reinforcement target floors A and D becomes longer, the heavier axial streak 19 can be held accordingly.
Therefore, the axial length of the surrounding steel plate 12 in the non-reinforcing target floors A and D and the length of the axial streak 19 disposed inside are based on the thickness, length, and weight of the axial streak 19 to be held. It is necessary to decide.
In addition, although the case where the two consecutive floors are designated as the reinforcement target floors B and C is described here, the reinforcement target floor is not limited to the second floor and may be only the first floor, or may be the third or more consecutive floors. .

Further, in this first embodiment, no lateral streak along the beam 13 is provided in the grout material 16 surrounded by the beam steel plate 14 (see FIG. 2). As shown in FIG. 2, in the configuration in which the beams 13 that are continuous in a straight line are connected to both sides of the pillar 1, sufficient reinforcing strength can be obtained without providing lateral stripes along the beams 13. .
However, in the case where the column 1 is a prism and the beam is not connected to both sides, it is preferable to provide a lateral stripe along the beam inside the enclosure steel plate for the beam.

The axial streak 19 is continuous from the lower non-reinforcing target floor A to the upper non-reinforcing target floor D, but may not be a single one having the entire length from the beginning. In consideration of transportability and workability, it is realistic to connect and use a plurality of axial streaks having a short axial length at the site of reinforcement work. For the connection of the above-mentioned axial direction stripes, any method can be used as long as the axial direction stripes 19 after connection can be kept in an integrated state, such as a dedicated connection fitting, welding, and a lap joint. Good.
The lap joint is a method of connecting the two by burying them in the grout material 16 by overlapping the axial positions of the axial streaks to be connected without using a special connecting fitting or the like. Such a lap joint is useful for a reinforcing structure of a building in which the thickness of a pillar is thicker on the lower floor side than the upper floor.

FIG. 4 shows a second embodiment using the lap joint.
This 2nd Embodiment is the reinforcement structure of the building which changed the thickness of the pillar 1 between the reinforcement | strengthening floors B and C, and the axial streak which divided | segmented the axial streak 19 of 1st Embodiment up and down 19 ′ and 19 ″. The other configurations are substantially the same as those of the first embodiment. Therefore, the same reference numerals as those in FIG. Description of is omitted.
And, from the lower non-reinforcement target floor A to the reinforcement target floor C, the pillar 1 is surrounded by the surrounding steel plate 12 that matches the thick part of the pillar 1, and in the upper non-reinforcement target floor D, the thin part of the pillar 1 is The pillar 1 is enclosed by the enclosed enclosure steel plate 12. FIG.

In addition, on the inner side of the surrounding steel plate 12, an axial streak 19 ′ that extends from the lower non-reinforcing floor A to the middle of the reinforcing floor C, and the upper non-reinforcing floor D to the middle of the reinforcing floor C. The axial streaks 19 "are arranged to be continuous with each other. The axial positions near the upper and lower ends of the axial streaks 19 'and 19" are overlapped and embedded in the grout material 16 and surrounded by a broken line. J is configured (see FIG. 4).
In the second embodiment, since the force is transmitted between the axial streaks 19 ′ and 19 ″ through the grout material 16 at the lap joint J, the divided axial streaks 19 ′ and 19 ″ are It functions as a continuous axial streak 19 and the same effect as the first embodiment is obtained.
In order to constitute the lap joint J, it is necessary to overlap the axial streaks 19 'and 19 "by a certain length or more. This necessary overlap length is determined by the adhesive force between the axial streaks and the grout material. Although it depends on the relationship with the strength of the axial streak and can be obtained by structural calculation, if the structural calculation is not performed, the overlap length is set to about 40 times the diameter of the axial streaks 19 ', 19 ". It is preferable.

The third embodiment shown in FIG. 5 is used when the entire circumference of the pillar 1 is not desired to be enclosed by a steel plate, or when the walls are continuous on both sides of the pillar 1 and the entire circumference of the pillar 1 cannot be enclosed. This is a useful reinforcing structure, which is not a reinforcing structure that surrounds the entire circumference of the pillar 1 with the steel plate 12 as in the first embodiment, but a reinforcing structure that surrounds only a specific surface of the pillar 1 on the floor to be reinforced.
As shown in FIG. 5, the third embodiment differs from the first embodiment in that only the front surface 1a of the pillar 1 is enclosed and covered with a steel plate 20, but the other configurations are the same as those in the first embodiment. Is the same. Therefore, in the following description, FIG. 1 is referred to, and in FIG. 5, the same reference numerals as those of the first embodiment are used for the same constituent elements as those of the first embodiment.

The enclosure steel plate 20 shown in FIG. 5 is composed of a pair of unit steel plates 21 and 22 having an L-shaped cross section, and each of the unit steel plates 21 and 22 includes front portions 21 a and 22 a arranged in parallel to the front surface 1 a of the pillar 1. The side portions 21b and 22b are orthogonal to these. And the axial direction length of each unit steel plate 21 and 22 is made into the length which divided | segmented the axial direction length of the column 1 which opposes into plurality.
Further, bolt holes 21c and 22c are formed in the side portions 21b and 22b.

  The front ends 21a and 22a of the pair of unit steel plates 21 and 22 as described above are overlapped with each other and the width thereof is matched to the width of the existing column 1 so that these front portions 21a and 22a are separated from the front surface 1a of the column 1. The column 1 is sandwiched by arranging the side portions 21b and 22b in close contact with both side surfaces of the column 1 while maintaining a predetermined interval. Then, the bolt 23 is passed through the bolt holes 21 c and 22 c, the nut 24 is tightened via the washer 25, and the side surfaces 21 b and 22 b are fixed to the side surface of the column 1.

Further, a plurality of enclosure steel plates 20 made of the unit steel plates 21 and 22 are installed in the vertical direction of the column 1.
Further, a belt-like sheet 18 is bonded to the surface of each enclosure steel plate 20, and a pair of unit steel plates 21, 22 connected in the circumferential direction of the column 1 are connected by the belt-like sheet 18, and the steel plates 20 arranged vertically. They are also connected to each other.
The enclosure steel plate 20 is the same as that of the first embodiment except that the enclosure steel plate 20 is used instead of the enclosure steel plate 12 of the first embodiment shown in FIG. However, the beam steel plate 14 is also provided only on the front surface 1a side of the column 1.

Although a detailed description of the same configuration as that of the first embodiment is omitted, the reinforcing structure of the third embodiment also includes the axial streak 19 along the pillars 1 of the reinforcement target floors B and C of the middle layer. It can hold | maintain with the grout material 16 of the lower non-reinforcement object floor A and the upper non-reinforcement object floor D, and can fix the both ends of the axial direction stripe | line 19 in the reinforcement object floors B and C. FIG. Therefore, also in the third embodiment, sufficient reinforcement strength of the reinforcement target floors B and C can be obtained without driving the vertical anchor 10 and the horizontal anchor 11 as in the conventional example shown in FIG. Can do. Moreover, a certain degree of reinforcement strength can be expected even in the non-reinforcing target floors A and B.
Moreover, since the reinforcement structure which arrange | positions the surrounding steel plate 20 only to the front surface 1a side like this 3rd Embodiment, when the said surrounding steel plate 20 is arrange | positioned to the outer wall side, the pillar 1 does not become thick on the indoor side, There is also an advantage that the building can be reinforced without narrowing the indoor space.

In addition, since the said 3rd Embodiment is a structure which fixes the side parts 21b and 22b of a pair of unit steel plates 21 and 22 which comprise the enclosure steel plate 20 to the side surface of the pillar 1, the wall surface where the side surface of the pillar 1 continues on both sides. If it does not protrude forward, it cannot be implemented.
For example, when the front surface 1 a and the wall surfaces on both sides are flush with each other, the surrounding steel plate 20 cannot be fixed to the side surface of the column 1. However, when the surrounding steel plate 20 cannot be fixed to the side surface of the pillar 1, the surrounding steel plate 20 is fixed to the front surface 1 a via a guide member, or the surrounding steel plate 20 disposed to face the front surface 1 a is formed with a formwork or the like. You can hold it using.
Regardless of the configuration of the surrounding steel plates and the method of maintaining the arrangement, as shown in FIG. 1, the axial streaks 19 that are continuous between the upper and lower non-reinforcing floors sandwiching the reinforcing floor are grouting on each floor. By embedding in the material 16, sufficient reinforcement strength can be obtained without hitting the vertical anchor 10 or the horizontal anchor 11 (see FIG. 6) on the existing column 1 or slab.

  In the above description, the first and second embodiments have been described in which the periphery of the concrete pillar 1 having a rectangular cross section is reinforced. However, the pillar 1 is not limited to a concrete pillar. For example, even if it is steel column, such as H steel, the reinforcement structure of each said embodiment is applicable by surrounding the circumference | surroundings with a surrounding steel plate and grout material, and embedding an axial streak. Also in this case, it is not necessary to drive the anchor into the slab or the steel column.

  The present invention is a multi-storey building, and is particularly useful in situations where intermediate floor reinforcement is required.

A (lower) non-reinforcing target floor B, C reinforcing target floor D (upper) non-reinforcing target floor 1 Column 12 Enclosure steel plates 13a-13d Beams 15a-15e Slab 16 Grout material 19 Axes 19 ', 19 "axis Direction stripe 19a Lower end 19b Upper end 20 Enclosure steel plate

Claims (4)

A specific floor or a plurality of consecutive floors in the middle floor of a multi-layer floor is a floor to be reinforced,
Surround the pillars that continue from the non-reinforcement target floor below the reinforcement target floor to the non-reinforcement target floor above the reinforcement target floor in each floor from the lower non-reinforcement target floor to the upper non-reinforcement target floor. Enclose with steel plate and fill grout material between this steel plate and the above pillars,
In this grout material, an axial streak that penetrates the upper slab and the lower slab of the floor to be reinforced and that extends from the lower non-reinforced floor to the upper non-reinforced floor is embedded. The lower end and upper end of the building are respectively reinforced in a structure in which the lower non-reinforcing floor and the upper non-reinforcing floor are positioned in a non-fixed state in the grout material provided on the non-reinforcing floor.   The upper end of the portion corresponding to each reinforcement target floor in the axial reinforcement is held by the grout material in the enclosed steel plate arranged on the floor above the reinforcement target floor, and the reinforcement target floor in the axial reinforcement The reinforcing structure for a building according to claim 1, wherein a lower end of a corresponding portion is held by a grout material in an enclosure steel plate arranged on a floor below the floor to be reinforced.   The reinforcing structure of a building according to claim 1 or 2, wherein a predetermined interval is maintained between a lower end of an enclosure steel plate provided on the lower non-reinforcing target floor and a slab facing the lower end.   The reinforcing structure of a building according to any one of claims 1 to 3, wherein a predetermined interval is maintained between an upper end of the surrounding steel plate provided on the upper non-reinforcing floor and a beam facing the upper end.

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