JP2002089053A - REINFORCING STRUCTURE OF EXISTING BUILDING BY PCa CONCRETE MEMBER - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure capable of performing construction work in a comparatively short period of time without reducing comfortable living property in an existing building. SOLUTION: PCa concrete members 11 having substantially the same width as an existing column 50 and substantially the same length with an interval between upper and lower parts of an existing beam 52 are opposingly arranged across a clearance on an outer side of the existing column, and joint mortar 31 is provided at a predetermined position of the clearance 35. Holes 52a, 12a passing through the existing beam and an upper end part of the PCa concrete member, respectively, are provided, and tension members 27 are inserted into these holes, respectively, to introduce a tension force so as to rigidly join the upper end part of the PCa concrete member. Holes 15a, 51a passing through one section of a lower end part of the PCa concrete member and a slab member 51 of the existing concrete building opposing to the lower end part thereof are provided, and tension members 15 are inserted into the holes to introduce a tension force so as to fix the lower end part of the PCa concrete member turnably and pivotally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for an existing concrete building using PCa concrete members.

[0002]

2. Description of the Related Art Conventionally, in order to reinforce an existing concrete building, a brace has been conventionally attached to the outside of an existing column or an existing beam, an existing column has been reinforced with reinforced concrete, and furthermore, the inside of an existing column or beam frame has been required. Walls are being built with cast-in-place concrete. However, when the brace is attached to the outside of the existing building, there is a drawback that the view from the window is obstructed, and when the brace is used as the veranda, it is difficult to get in and out, and the veranda becomes narrow and the comfort is reduced. In addition, when adding existing columns or adding walls with cast-in-place concrete, it is difficult to use existing buildings for a relatively long time, so it is difficult to apply them to existing buildings with residents. there were.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reinforcing structure capable of performing construction in a relatively short period of time without lowering the livability of existing buildings. is there.

[0004]

According to the present invention, there is provided a reinforcing structure for an existing concrete building, wherein a PCa concrete member having substantially the same width as the existing column and substantially the same length as the vertical interval between the existing beams is provided on the outside of the existing column. A pressure receiving member is provided in a gap between the upper end of the PCa concrete member and the existing beam to hold the gap, and an existing beam on both sides sandwiching the existing column and the upper end of the PCa concrete member are provided. The upper part of the PCa concrete member is rigidly joined by applying a tension to the tension member inserted into each of the holes.
A hole is provided at one position between the lower end of the PCa concrete member and the slab material of the existing concrete building facing the lower end, and a tension member is inserted into the hole to introduce a tension into the tension member. This provides a reinforcing structure for an existing building in which the lower end portion of the PCa concrete member is pivotably connected to the lower end.

[0005] In the present invention, the PCa concrete member is provided with a through hole vertically penetrating, the through hole is formed as one hole penetrating to the slab material in claim 1, and a predetermined position of the through hole is provided. If a tension member having a fixing member such as a nut provided at the upper end thereof is inserted into the through hole, the tension member can be fixed by the pressure plate. Also, at the upper end of the PCa concrete member,
It is preferable to form convex portions extending to the existing beams on both sides of the existing column. In this case, holes are respectively provided through the existing beams from the convex portions on both sides, and the tension members are inserted into the holes, respectively. The upper end of the PCa concrete member may be rigidly joined by introducing tension into the PCa. Furthermore, the pressure-receiving member only needs to have a frictional resistance that does not easily cause a sliding failure at a crimped portion between the upper end portion of the PCa concrete member and the existing beam-to-column joint. The gap may be filled with mortar.

In the present invention, a notch is provided at the lower end of the PCa concrete member, so that a surface of the PCa concrete member which comes into contact with the slab material or a pressure receiving member (for example, joint mortar) provided between the slab material and the slab material is reduced. Preferably, such a configuration makes it relatively easy to pivot at the lower end of the PCa concrete member at one location,
Damage occurring at the lower end can be reduced.

In the present invention, a PCa concrete member, which is a reinforcing structure of an existing concrete building and has a width substantially equal to an existing column and a length substantially equal to a vertical interval of an existing beam, has a predetermined gap outside the existing column. In order to hold the gap, pressure receiving members are fixed to upper and lower ends of the PCa concrete member and the existing beams, respectively, and penetrate the upper and lower ends of the PCa concrete member and the existing beams. A hole is provided, and a tension is introduced into the tension member inserted into the hole, thereby providing a reinforcing structure for an existing building formed by pressing the PCa concrete member along the existing column.

Further, according to the present invention, there is provided a reinforcing structure for an existing concrete building, in which PCa concrete members having substantially the same width as the existing columns and substantially the same length as the vertical spacing of the existing beams are connected to the upper and lower layers. Holes are respectively provided facing the outside of the existing column with a predetermined gap therebetween, and holes are respectively provided through the existing beam on both sides sandwiching the existing column and the upper end of the PCa concrete member, and the tension members respectively inserted into the holes are provided. While the upper end of the PCa concrete member is rigidly joined by the introduction of tension, a hole is formed through the PCa concrete member in the vertical direction and the slab material of the existing concrete building. Tension is introduced into the tension member inserted into the hole so as to be continuous with the story, so that the upper and lower ends of the PCa concrete member are rigidly attached to the slab material. Reinforcing structure of an existing building comprising engaged is provided.

In the present invention, the PCa concrete member may be a member into which prestress is introduced.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing a reinforcing structure 10 in an existing building provided with a veranda, an outer corridor, and the like on the outside of a living room, FIG. 2 is a side view of the reinforcing structure in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line III-III, and FIG.
FIG. 2 is an enlarged cross-sectional view of the upper and lower end portions of FIG. In FIG. 1 to FIG. 4, the reinforcing structure 10 is provided outside the existing column 50 in an existing building, for example, on a veranda or outside corridor (not shown), and the PCa concrete member 11 is provided outside the existing column 50. The upper end of the existing beam 5 is provided by a PC steel rod 27 serving as a tension member at two places at the upper end.
2 while the lower end is made of PC steel bar 1
5 is rotatably connected to the veranda slab 51 or the slab in the corridor.

Here, the PCa concrete member 11
Is formed to have a width substantially equal to the width of the existing column 50 and a length substantially equal to the vertical interval of the existing beam 52, and to have a concave groove 13 substantially at the center of the upper end.
A fixing portion 12 extending to the existing beam 52 is provided on both sides, and a cutout portion 14a is formed at a lower end portion. The notch 14a cuts the lower end of the PCa concrete member 11 and makes the surface in contact with the veranda slab 51 or the joint mortar 22 at the lower end smaller, thereby rotating the lower end of the PCa concrete member 11. And the PCa concrete member 11
This also reduces the damage that occurs at the lower end of the device. Also PC
In the concrete member 11, a through-hole 11 a for inserting the PC steel rod 15 is vertically extended, and both the fixing portions 12 are provided with through-holes 12 a that penetrate the front and back of the PCa concrete member 11. Vertical through hole 1
The support plate 16 is buried near the upper end of 1a, and has a diameter such that at least the nut 19 can be inserted into the section 11a 'above the support plate 16 in the through hole 11a. In addition,
The PCa concrete member 11 may be a prestressed concrete member in which a PC steel material is buried and tension is previously introduced according to the strength required for the member.

An existing building reinforced by the PCa concrete member 11 includes an existing beam 52 on both sides of an existing column 50.
A through hole 52a penetrating the inside and outside of the living room is formed in the living room, and a through hole 51a penetrating up and down at a position corresponding to the existing column 50 is formed in the veranda slab 51. At this time, the existing beam 52
It is preferable that the through-hole 52a is formed as close to the existing column 50 as possible, and the through-hole 51a of the veranda slab 51 is formed at the lower end of the PCa concrete member 11 attached with a predetermined gap 35 from the existing column 50. Drill at a position facing the part.

The through hole 51a on the veranda slab 51
Is mounted around the mortar form ring 22a, and the mortar joint 22 is formed around the mortar form ring 22a. This mortar joint 22 is made of PC
a It is formed before the concrete member 11 is attached. A mortar form ring 31a is similarly fixed around the through hole 52a of the existing beam 52, and a mortar joint 31 is formed around the mortar form ring 31a. This mortar joint 31 is made of PC
a It can be formed regardless of before and after the work of attaching the concrete member 11.

The PCa concrete member 11 is shown in FIG.
As shown in detail in FIG. 2, the through hole 11a provided in the up-down direction and the through hole 51a of the veranda slab 51 are placed on the mortar joint 22 so as to communicate with each other, and are inserted through these through holes 11a, 51a. The upper end of the PC steel bar 15 is fixed to the support plate 16 by a nut 19, and the lower end of the PC steel bar 15 is fixed to the lower surface of the veranda slab 51 by the support plate 25 and the nut 26.
A tension of about 1000 kN is introduced. The lower end of the PCa concrete member 11 has only one PC
Since it is press-bonded by the steel bar 15, even when a horizontal displacement is transmitted to the lower end, the shearing force can be transmitted downward without generating bending stress. Also PCa
The upper end of the concrete member 11 is arranged such that the through hole 12a and the through hole 52a of the existing beam 52 communicate with each other at two places, and the joint mortar 31 is filled in the gap 35 around the through holes 12a, 52a. A pressure receiving member is formed, and both ends of the PC steel rod 27 inserted into the two through holes 12a and 52a are respectively supported by the support plate 20,
28 and nuts 21 and 29, and a PC steel rod 27
, A tension of about 500 to 1000 kN is introduced at the time of tightening. Since the upper end of the PCa concrete member 11 is press-bonded at two places by the PC steel rod 15, the upper end is displaced in the horizontal direction similarly to the existing building.

A projection 14c as shown in FIG. 5 may be provided on the lower end surface of the PCa concrete member 11, so that a slippage occurs between the PCa concrete member 11 and the mortar joint 22. Can be prevented. Also, the through-hole 51a of the veranda slab 51 and the PCa
By forming an unbonded structure without filling the grout material with the through hole 11a of the concrete member 11, even if a horizontal displacement occurs in the existing building, the joint portion between the PCa concrete member 11 and the veranda slab 51 is formed. P
The displacement can be transmitted by the rotation of the C steel bar 15. Through holes 12a and 52a other than these through holes 11a and 51a
Whether or not the grout material is filled may be appropriately selected. Further, although not shown, the upper end of the PCa concrete member 11 and the veranda slab 5 opposing the upper end.
The mortar may be filled in the gap between the slab 51 and the lower surface of the slab 51 to thereby reinforce the veranda slab 51.

Next, the operation of the reinforcing structure 10 shown in FIGS. 1 to 4 will be described. When an external force such as an earthquake acts on an existing building reinforced by the reinforcing structure 10, a horizontal displacement occurs between each story. At this time, since the upper end of the PCa concrete member 11 is rigidly joined at two places of the existing beam 52 by crimping with the PC steel bar 27, the PCa concrete member 11 moves in the horizontal direction by the same displacement together with the existing column 50 and the existing beam 52. On the other hand, the lower end of the PCa concrete member 11 is connected to the PC steel bar 27 at one location of the existing veranda slab 51.
Since it is joined rotatably by crimping with
Even if the existing column 50 or the existing beam 52 is displaced, the PCa concrete member 11 is rotated around the PC steel bar 27 at the lower end thereof to prevent the bending stress from being generated therein and to reduce the shearing force. To communicate.

FIGS. 6A and 6B are simplified cross-sectional views for explaining the difference in the shape of the PCa concrete member that occurs when the arrangement of the existing columns and the existing beams is different.
7A corresponds to FIG. 6A, and FIG. 7B corresponds to FIG.
FIG. 3 is a simplified perspective view of a PCa concrete member corresponding to FIG. In FIG. 6A, the existing pillar 50 is connected to the existing beam 5 on the living room side.
On the outside of the living room, the existing pillar 50 and the existing beam 52 are arranged so that the surfaces thereof are flat and continuous,
The PCa concrete member 11 to be attached to such an existing building is, as shown in FIGS.
The one having a flat surface facing the existing building is used, which can be the same as the PCa concrete member 11 shown in FIGS. In FIG. 6B, the existing pillar 60 is disposed so as to protrude beyond the existing beam 62 outside the living room, and P is attached to the outside of the living room.
The Ca concrete member 70 is shown in FIGS.
As shown in (b), the fixed portion 71 at the upper end is
The one provided with the convex portion 71a so as to project toward 2 is used. As can be seen by comparing FIGS. 6A and 6B, the PCa concrete member 70
The configuration excluding 1a can be formed exactly the same as the PCa concrete member 11.

Next, FIG. 8A is a front view showing a reinforcing structure 60 of an existing building in which a veranda or an outside corridor is not provided outside the living room, unlike FIGS. 1 to 4, and FIG. )
8 is a side view of FIG. 8A, and FIG. 9 is a reinforcing structure 6 of FIG.
FIG. 5 is an enlarged cross-sectional view showing the vicinity of the upper and lower ends of the PCa concrete member 61 at 0. 8 and 9, the PCa concrete member 61 is formed to have a width substantially equal to that of the existing column 80 and a length substantially equal to the vertical interval of the existing beam 82, and fixed portions 62 extending to the existing beam 82 on both sides of the upper and lower ends.
The four fixed portions 62 are provided with through holes 62a penetrating from front to back. Note that the fixing portion 62
Is preferably formed as short as possible within a range that allows the PCa concrete member 61 to be crimped to the existing beam 82 by the PC steel rod 73 described later.

The PCa concrete member 61 is opposed to the existing pillar 80 with a predetermined gap 65 therebetween by interposing a joint mortar 75 around the through hole 62a. The through-hole 82a penetrating inside and outside is inserted into the through-hole 6 of the PCa concrete member 61.
2a, PC steel rods 73 are inserted into the respective through holes 62a, 82a, and both ends of each PC steel rod 73 are fixed by the support plate 71 and the nut 72.
A tension of about 1000 kN is introduced into each PC steel bar 73 to form the reinforcing structure 60. In this way, in the reinforcing structure 60, the upper end and the lower end of the PCa concrete member 61 are respectively press-bonded to the existing beam 82 via the joint mortar 75 at two places. Each is rigidly connected to the existing beam 82.

In an existing building reinforced by the above-described reinforcing structure 60, the horizontal strength of the vertical members such as the existing columns 80 is improved, and the rigidity between layers and planes is corrected. Even when an external force acts, it is possible to prevent the column portion from being rapidly broken.

Next, a reinforcement structure different from those shown in FIGS. 1 and 8 will be described with reference to FIGS. 10 and 11, the PCa concrete member 91 is formed to have substantially the same width as the existing column 80 and substantially the same length as the vertical spacing of the veranda slab 84, and the existing beams 82 on both sides of the upper end.
A fixing portion 92 is provided extending to the two fixed portions 92.
In addition, a through hole 92a penetrating from the front to the back and a through hole 94 penetrating vertically are used at two places.

The PCa concrete member 91 has a joint mortar 96a, 96b interposed between the upper and lower end surfaces of the PCa concrete member 91 and the upper and lower veranda slabs 84 for each story, and is provided with a predetermined width from the outer surface of the existing column 80. Are opposed to each other with a gap 98 therebetween. In addition, through holes are provided in the upper and lower veranda slabs 84 so as to be continuous with the through holes 94 of the PCa concrete member 91,
Also, a through hole 82a penetrating the existing beam 82 into and out of the living room.
Are provided so as to be continuous with the through holes 92a of the PCa concrete member 91, and joint mortars 97 as pressure receiving members are provided in gaps 98 near these through holes 82a and 92a. Then, P is inserted into the through hole 94 and the through hole of the veranda slab 84 so as to penetrate all the PCa concrete members 91 arranged at the same position in the upper and lower layers.
C strand 95 is inserted, and this PC strand 95
After the tension is introduced into the slab, the upper and lower ends thereof are fixed to the uppermost slab (not shown) and the lowermost slab (not shown) by the support plate or the nut. Also, the through hole 82a of the existing beam 82 and the through hole 9 of the PCa concrete member 91 are provided.
2a, a PC steel rod 93c is inserted and inserted into each PC.
Both ends of the steel bar 93c are fixed by a support plate 93a and a nut 93b, and a tension is applied to each PC steel bar 93c to form a reinforcing structure 90.

[0023]

In the reinforcing structure according to the first aspect, the PCa concrete member is disposed facing the outside of the existing column with a predetermined gap therebetween via the pressure receiving member, and the upper end of the PCa concrete member is rigidly connected to the existing beam. Since the lower end is pivotally connected to the existing slab material, the upper end of the PCa concrete member moves horizontally by the same displacement together with the existing columns and beams, and the lower end of the PCa concrete member is tensioned. Since it can rotate around the material and transmit the shearing force to the lower layer, it is possible to prevent the occurrence of bending stress there.

In the reinforcing structure of the present invention, a PCa concrete member having substantially the same width as the existing column and substantially the same length as the vertical interval of the existing beam is attached to the outside of the existing column as a reinforcing material. Thus, the field of view and the daylighting area can be maintained almost the same as before the reinforcement without the openings such as the windows being blocked by the reinforcing material.

Further, in the reinforcing structure of the present invention, the work on the existing building is only the work of providing a through hole in the existing beam or the existing slab material and the work of attaching the PCa concrete member. Compared with the piling method and the wall extension method, it is possible to shorten the construction period and reduce the on-site work, and it is possible to form the reinforcing structure without lowering the livability in the existing building in use.

[Brief description of the drawings]

FIG. 1 is a front view of a reinforcing structure in an existing building of the present invention.

FIG. 2 is a side view of the reinforcing structure of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view of a portion surrounded by a circle IV in FIG.

FIG. 5 is a cross-sectional view showing the lower end of the PCa concrete member in the reinforcing structure of the present invention in an enlarged manner from the front.

FIGS. 6A and 6B are simplified cross-sectional views for explaining a difference in the shape of a PCa concrete member caused when the arrangement of an existing column and an existing beam is different.

FIG. 7 (a) corresponds to FIG. 6 (a), and FIG.
It is a simple perspective view of a PCa concrete member corresponding to (b).

8 (a) is a front view of a reinforcing structure of the present invention different from FIG. 1, and FIG. 8 (b) is a side view of FIG.

9 is an enlarged cross-sectional view showing the upper and lower ends of the PCa concrete member in the reinforcing structure of FIG. 8;

FIG. 10 is a front view of a reinforcing structure according to the present invention, which is different from FIGS. 1 and 8;

FIG. 11 is a side view of the reinforcing structure of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforcement structure 11 PCa concrete member 11a, 12a, 51a, 52a Through hole 15 PC steel rod (tensile material) 27 PC steel rod (tensile material) 31 Joint mortar (pressure receiving member) 35 Gap 50 Existing column 51 Veranda slab (slab material) ) 52 Existing beam 52a Through hole 60 Reinforcement structure 61 PCa concrete member 62a, 82a Through hole 73 PC steel rod (tensile material) 75 Joint mortar (pressure receiving member) 80 Existing column 82 Existing beam 84 Veranda slab (slab material) 90 Reinforcement structure 91 PCa concrete member 93c PC steel rod (tensile member) 94 Through hole 95 PC strand (tensile member) 97 Joint mortar (pressure receiving member)

Claims (4)

[Claims] A precast concrete member (hereinafter referred to as PC) having a reinforcing structure of an existing concrete building and having a width substantially equal to that of an existing column and a length substantially equal to a vertical interval of an existing beam.
a concrete member) is disposed facing the outside of the existing column with a predetermined gap therebetween, and the PC is used to hold the gap.
aA pressure receiving member is provided in a gap between the upper end of the concrete member and the existing beam, and the existing beam and the PC on both sides sandwiching the existing column are provided.
The upper end of the PCa concrete member is provided with a hole penetrating therethrough, and the tension member is inserted into each of the holes to apply a tension, whereby the upper end of the PCa concrete member is rigidly joined, while the PCa concrete is A hole is provided at one position between the lower end of the member and the slab material of the existing concrete building opposed to the lower end, and the tension is introduced into the tendon inserted through the hole, whereby the PC is inserted.
a Reinforcement structure of an existing building in which the lower end of a concrete member is pivotally connected. 2. The PCa concrete member is provided with a through hole vertically penetrating therethrough, and the through hole is formed as one hole penetrating to the slab material according to claim 1, and is supported at a predetermined position of the through hole. 2. The reinforcing structure for an existing building according to claim 1, wherein a pressure plate is buried, a tension member is inserted into the through-hole, and an upper end thereof is fixed by the support plate. 3. A reinforcing structure for an existing concrete building, wherein a PCa concrete member having substantially the same width as the existing column and substantially the same length as the vertical interval of the existing beam is disposed facing the outside of the existing column with a predetermined gap. A pressure receiving member is fixed to opposing surfaces of the upper and lower ends of the PCa concrete member and the existing beam to hold the gap, and holes are provided through the upper and lower ends of the PCa concrete member and the existing beam. A reinforcing structure for an existing building, wherein the PCa concrete member is crimped along the existing column by introducing tension into the tendon material inserted into the hole. 4. A reinforcing structure for an existing concrete building, wherein PCa concrete members having substantially the same width as the existing columns and the same length as the vertical spacing of the existing beams are respectively connected to the existing columns so as to be continuous with the upper and lower layers. The existing beam on both sides sandwiching the existing column and the P
Holes are provided to penetrate the upper end of the Ca concrete member, respectively, and a tension member is inserted into the holes to apply a tension to the upper end of the PCa concrete member. A hole penetrating the member in the vertical direction and the slab material of the existing concrete building is provided, and a tension is introduced into the tension material inserted into the hole so as to be continuous with the upper and lower layers, thereby forming the PCa concrete. A reinforcing structure for an existing building in which upper and lower ends of members are rigidly joined to the slab material.