JP2013227774A - Reinforcement structure of extremely brittle pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of an extremely brittle pole in which sufficient reinforcement effect is gained while facilitating construction.SOLUTION: In a reinforcement structure of an extremely brittle pole 2, either of a hanging wall 4 or a spandrel wall 3 is or both are continued on both sides. The whole circumference of the pole 2 in an inside measurement part 9 other than a part corresponding to the hanging wall 4 or the spandrel wall 3 is surrounded at a predetermined interval by a reinforcement steel plate 10 for the inside measurement part. Reinforcement steel plates 11, 12 for parts mounted on a wall, which reinforce the part other than the inside measurement part, are provided. The reinforcement steel plates 11, 12 for the parts mounted on the wall includes: pole surrounding sections 11a, 12a surrounding the pole part other than the inside measurement part 9 at the predetermined interval; and contact parts 11b, 12b along the wall along the spandrel wall 3 or the hanging wall 4 of both sides of the pole 2. The reinforcement steel plate 10 for the inside measurement part and the reinforcement steel plates 11, 12 for the parts mounted on the wall are integrated in an axial direction of the pole 2 and continued. Grout materials 18 are filled between the reinforcement steel plate 10 and the reinforcement steel plates 11, 12 for the parts mounted on the wall, and the pole 2.

Description

  The present invention relates to a structure for reinforcing extremely brittle columns in an existing building.

The pillars of concrete buildings include those that are strong against shear but that break by bending deformation, those that are strong against bending but weak against shear, those that are weak against both bending and shear, and those that are strong against both. However, if there is a very brittle column that can be destroyed by a very small deformation, for example, about 1/500, the strength of the entire building becomes extremely low, and it cannot withstand earthquakes. Therefore, it is important for any building to reinforce extremely brittle columns.
In addition, as described above, the condition for forming a very brittle column that cannot withstand slight deformation is that the relationship between the column width D and the effective inner height h of the column is h / D <2. That is, a column whose inner height h is smaller than twice the column width D and whose thickness is short is not easily bent and easily broken. The column width D is a column width parallel to the applied force direction.

FIG. 7 shows that a pillar 2 penetrating the beam 1 is provided with a waist wall 3 and a hanging wall 4 on both sides, and a window frame 5 is provided at an opening between the waist wall 3 and the hanging wall 4. It is a structure.
The window opening is between the waist wall 3 and the hanging wall 4, but in this opening, a base material 6 for attaching the window frame is provided around the window frame 5. Actually, portions other than the waist wall 3 and the hanging wall 4 are not open.
Unlike the walls 3 and 4, the base material 6 is not a structural body, and therefore is not as strong as the wall. Therefore, when a shaking such as an earthquake occurs, it is considered that the pillar 2 is freely bent at the base material 6 portion.

In the structure including the waist wall 3 and the drooping wall 4 as described above, the inner height H1 of the column 1 is particularly short, and thus the above-mentioned extremely brittle column in which H1 / D <2 is often obtained.
Thus, when the column 2 is a very brittle column, it is necessary to reinforce the column 2.
Therefore, conventionally, as shown in FIG. 8, slits 7 and 8 are formed in the waist walls 3 and 3 on both sides of the column 2 and the hanging walls 4 and 4, and the column 2 and the wall are formed by these slits 7 and 8. 3 and 4 were separated. In this way, the slits 7 and 8 are formed, and the effective inner height H2 of the column 2 is increased by separating the column 2 from the waist wall 3 and the hanging wall 4. As described above, in the conventional reinforcing structure, the inner method height H2 is increased so that the inner method height H2 / D> 2, and the bending strength of the column 2 is increased to eliminate extreme brittleness.

In addition, although such an extremely brittle column reinforcing structure has been actually carried out, no literature has been found.
Moreover, the reinforcement structure described in patent document 1, 2 is also known as a general pillar reinforcement structure which is not restricted to extreme brittleness. These reinforcing structures of Patent Documents 1 and 2 surround a pillar with a grout material and a steel plate.

JP 2005-023745 A JP 2008-240368 A

In the conventional method for reinforcing extremely brittle columns, there is a problem that the existing walls 3 and 4 must be destroyed in order to form the slits 7 and 8, and the construction becomes large. In addition, the column 2 having a longer effective inner height is slightly improved in bending strength, but the walls 3 and 4 formed integrally with the column 2 are separated from the column, so The overall strength may be reduced.
In any case, the reinforcing structure for forming the slits 7 and 8 takes a lot of work, and a sufficient reinforcing effect cannot be obtained.
An object of the present invention is to provide a reinforcing structure for extremely brittle columns that can provide a sufficient reinforcing effect while facilitating construction work.

  1st invention is the reinforcement structure of the extremely brittle pillar which provided the opening part on both sides, and either the waist wall or the drooping wall on both sides, and both continued, Comprising: Except the part corresponding to a waist wall or a drooping wall While enclosing the entire circumference of the inner portion of the extremely brittle column at a predetermined interval with a reinforcing steel plate for inner portion consisting of a plurality of members that are continuous in the circumferential direction with overlapping circumferential ends. The above-mentioned extremely brittle column other than the legal part and the wall-attached part reinforcing steel plate that reinforces the waist wall or the drooping wall continuous to the extremely brittle column other than the inner legal part. A column enclosure part that surrounds the extremely brittle column part other than the above with a predetermined interval, and a wall joint part along a waist wall or a drooping wall on both sides of the extremely brittle column, Reinforced steel sheets for wall-mounted parts are integrated in the axial direction of the above extremely brittle columns Causes continuous and characterized in that it filled with grout between the inside dimension of the portion for reinforcing steel and Kabezuke portion for reinforcing steel and the electrode brittle pillars.

  According to a second aspect of the present invention, there is provided an attachment plate protruding in the axial direction of the extremely brittle column on one of the reinforcing steel plate for inner part and the reinforcing steel plate for wall part adjacent to each other, and A reinforcing steel plate for inner part and a reinforcing steel plate for wall part are brought into contact with the above-mentioned accessory plate.

  According to a third aspect of the present invention, a belt-like sheet is attached to the outside of the inner part reinforcing steel plate and the walled part reinforcing steel plate, and the inner part reinforcing steel plate and the walled part reinforcing steel plate are integrated with each other by the band sheet. It is characterized by that.

In the first invention, by removing the base material of the opening, it is possible to reinforce the extremely brittle column without destroying the wall as in the prior art. The operation of removing the base material in the opening is overwhelmingly easier than forming a slit in an existing wall, and its workability is good.
Moreover, the column surrounded by the reinforcing steel plate and the grout material can obtain a sufficient reinforcing strength. Further, the strength of the wall is not impaired.

According to the side plate of the second aspect of the invention, it is possible to easily perform an operation of accurately continuing the inner portion reinforcing steel plate and the walled portion reinforcing steel plate in the axial direction. Therefore, the workability of the reinforcement work is further improved.
Further, if the side plate is provided on the inner side reinforcing steel plate side, it is possible to prevent the inner side reinforcing steel plate from being shifted outward due to pressure during the filling of the grout material or in the process of solidifying.
If the inner steel plate is displaced outward until the grout is solidified, there will be a gap between the solidified grout material and the column surface or the reinforcing steel plate, or a nest will be formed in the grout material. However, such a problem can be avoided by providing a plate along the reinforcing steel plate for the inner part.
That is, the above-described side plate increases the integrity of the inner portion reinforcing steel plate and the walled portion reinforcing steel plate, and also increases the reinforcing strength.

  Further, according to the third invention, it is possible to integrate the inner portion reinforcing steel plate and the walled portion reinforcing steel plate without performing welding work or the like at the site. If the reinforcing steel plate for the inner part and the reinforcing steel plate for the walled part are securely integrated before filling the grout material, the reinforcing steel plate will not easily shift during the filling of the grout material or in the solidification process. Adhesion between the material and the column surface is also improved, and as a result, a sufficient reinforcing height can be obtained.

FIG. 1 is a front view of symmetrical reinforcement in an embodiment of the present invention. FIG. 2 is a front view of the reinforcing structure of the embodiment. FIG. 3 is a perspective view in which a portion corresponding to two beams is omitted in the reinforcing structure of the embodiment. FIG. 4 is a cross-sectional view of a portion of a column corresponding to the inner portion of the embodiment and its surroundings. FIG. 5 is a cross-sectional view of a column corresponding to the waist wall of the embodiment and the periphery thereof. FIG. 6 is a cross-sectional view of the side plate portion of the embodiment. FIG. 7 is a front view of a structure having extremely brittle columns. FIG. 8 is a front view of a conventional extremely brittle column reinforcing structure.

The embodiment of the present invention shown in FIGS. 1 to 6 includes a waist wall 3 and a drooping wall 4 that are continuous on both sides of the pillar 2, and the base material 6 is provided between the waist wall 3 and the drooping wall 4. In the structure in which the window frame 5 is attached to the provided opening, the pillar 2 is reinforced.
The column 2 has a length other than that corresponding to the waist wall 3 and the drooping wall 4, that is, an effective inner length H1 which is the length of the portion corresponding to the opening, which is smaller than twice the column width D. It is a very brittle column.

Further, in FIG. 1, the boundary between the waist wall 3 and the hanging wall 4 and the opening is indicated by a broken line, but in reality, a surface material is provided so that the boundary of the opening is not apparent.
In the reinforcing structure of this embodiment shown in FIG. 2, in the inner portion corresponding to the opening, the entire circumference of the extremely brittle column 2 is surrounded by a reinforcing steel plate 10 for inner portion, and the other portions are reinforced. Is covered with the reinforcing steel plates 11 and 12 for the walled portion and the reinforcing steel plate 13 for the beam portion and reinforced.

The inner steel portion reinforcing steel plate 10 is composed of four surrounding plate members 10a as shown in FIG.
Each of the surrounding plate members 10a is a plate member that is bent at a right angle along an axial fold line, and the both ends of the surrounding plate members 10a are overlapped with the adjacent surrounding plate member 10a to form the inner portion reinforcing steel plate 10. Yes.
In order to provide such a reinforcing steel plate 10 for the inner portion in the inner portion of the column 2, an opening corresponding to the inner height H1 of the column 2, that is, the inner method shown by a two-dot chain line in FIG. The base material 6 of the corresponding portion 9 is removed, and a space is formed on the outer periphery of the inner portion of the pillar 2.

Then, the inner-law-part reinforcing steel plate 10 is provided in the inner-method-corresponding portion 9 including the space formed excluding the base material 6, and the outer periphery of the column 2 is predetermined by the inner-method-part reinforcing steel plate 10. Enclosed with an interval. In this interval, grout material 18 is filled as will be described later.
In addition, in order to keep the space | interval of the said pillar 2 and the reinforcement steel plate 10 for internal parts, a formwork may be provided in the outer side of the reinforcement steel plate 10 for internal parts, or a spacer may be provided inside.
Further, the number of the surrounding plate members 10a constituting the inner portion reinforcing steel plate 10 is not limited to four as long as the entire circumference of the pillar 2 can be enclosed, and may be any number.

  Further, the walled partial steel plate 11 surrounding the portion corresponding to the waist wall 3 in the column 2 includes a column surrounding portion 11a having a substantially U-shaped cross section as shown in FIGS. It is a member provided with wall-side contact portions 11b and 11b protruding on both sides. And the column enclosure part 11a is made to oppose the front surface of the pillar 2, and the wall joint part 11a is being fixed to the waist wall 3 with the volt | bolt 14. FIG.

Further, a portion of the pillar 2 corresponding to the drooping wall 4 is surrounded by a wall-attached partial steel plate 12 for the drooping wall 4, and a portion corresponding to the beam 1 is surrounded by a beam portion reinforcing steel plate 13.
The walled portion reinforcing steel plate 12 and the beam portion reinforcing steel plate 13 have the same shape as the walled portion reinforcing steel plate 11.
That is, the wall-reinforced portion reinforcing steel plate 12 includes a column surrounding portion 12a and a wall-contacting portion 12b, and the beam portion reinforcing steel plate 13 includes a column-enclosing portion 13a and a beam-contacting portion 13b. These wall-side contact portions 12 b and beam-side contact portions 13 b are fixed to the hanging wall 4 or the beam 1 with bolts 14.

Further, along the upper and lower ends of the reinforcing steel plate 10 for the inner method, side plates 15, 15 projecting in the axial direction are provided as shown in FIG. 6. The side plate 15 is fixed to the column 2 side surface of the internal reinforcing steel plate 10 via a welded portion 16.
And the reinforcing steel plates 11 and 12 with a wall adjacent to this reinforcing steel plate 10 for internal methods are provided in contact with the side plates 15 and 15.
If such a side plate 15 is provided, the wall-attached partial reinforcing steel plates 11 and 12 can be provided in contact with the side plate 15. , 12 can be reliably and easily aligned.

As described above, the reinforcing steel plates 10 to 13 are kept at a predetermined distance from the surface of the pillar 2, and the outer surfaces of all the reinforcing steel plates 10 to 13 are substantially flush with each other. The reinforcing steel plates 10 to 13 are integrated in the axial direction of the column 2 by attaching a fiber sheet (not shown).
As described above, a plurality of reinforcing reinforcing bars 17 are erected and the grout material 18 is filled in the space between the column 2 and the reinforcing steel plates 10 to 13 provided at a predetermined distance from the surface thereof. If the material 18 is solidified, the reinforcing structure of this embodiment is completed.

When the filled grout material 18 is solidified, the column 2 is integrated with the reinforcing reinforcing bar 17 and the reinforcing steel plates 10 to 13 through the grout material 18. Therefore, the post-reinforced column 2 surrounded by the reinforcing steel plates 10 to 13 includes the reinforcing reinforcing bar 17 and is also connected to the walls 3 and 4 and has sufficient reinforcing strength.
Further, the reinforcing structure of this embodiment does not need to form the slits 7 and 8 by destroying the waist wall 3 and the hanging wall 4 which are existing structures as in the above-described conventional reinforcing structure. The construction can be simplified because the inner steel reinforcement steel plate 10 can be provided simply by removing the material 6.

In this embodiment, the reinforcing steel plates 11 to 13 other than the inner portion reinforcing steel plate 10 are similarly provided on both sides of the walls 3 and 4 (see FIGS. 4 and 5). The wall portion reinforcing steel plates 11 and 12 and the beam portion reinforcing steel plate 13 may be provided only on one side of the walls 3 and 4 and the beam 1 as long as sufficient reinforcing strength is obtained.
Moreover, in this embodiment, although the board 15 is provided along the upper and lower sides of the reinforcement steel plate 10 for internal parts, such a board 15 is made into the reinforcement steel plate 13 for a beam part, the reinforcement steel plate 12 for a wall part, If it also provides between, the alignment of the reinforcing steel plate 13 for the beam portion becomes easy, and the workability is further improved. However, the side plate 15 is not an essential component in the reinforcing structure of the extremely brittle column of the present invention.

Further, the side plate 15 may be provided on any one of the reinforcing steel plates that are continuous in the axial direction, and may be provided on the side of the reinforcing steel plates 11 and 12 for the walled portion instead of the inner portion reinforcing steel plate 10. .
However, as in this embodiment, if the side plates 15 are provided above and below the inner portion reinforcing steel plates 10 instead of the walled portion reinforcing steel plates 11 and 12, the work of aligning the reinforcing steel plates is performed. In addition to improving the properties, even if the pressure of the grout material 18 filled between the pillars 2 is applied, the inner steel portion reinforcing steel plate 10 can be hardly displaced outward.

The reason is as follows.
Among the reinforcing steel plates 10 to 13, the reinforcing steel plates 11 and 12 for the walled portion and the reinforcing steel plate 13 for the beam portion are respectively attached to the waist wall 3, the drooping wall 4, and the beam 1, the wall-joining portions 11 b and 12 b, and the beam. Since it is fixed with the bolt 14 via the contact portion 13b, it is difficult to shift outward even when the pressure of the grout material 18 acts.
On the other hand, since the inner portion reinforcing steel plate 10 is not fixed to a wall or the like, it is considered that the inner steel portion reinforcing steel plate 10 is likely to shift outward due to the pressure of the grout material 18 as compared with the other reinforcing steel plates 11 to 13.

However, in this embodiment, when the side plates 15 provided at the upper and lower ends of the inner portion reinforcing steel plate 10 receive the pressure of the grout material 18, the walled portion reinforcing steel plates 11, 12 adjacent in the axial direction are provided. Therefore, the inner portion reinforcing steel plate 10 can be prevented from shifting outward.
Thus, it is difficult for the inner portion partial reinforcing steel plate 10 to slip outwardly by the filled grout material 18, which means that the inner portion partial reinforcing steel plate 10 and the walled portion reinforcing steel plates 11 and 12 are displaced. It is difficult. Therefore, the reinforcing steel plates adjacent in the axial direction are reliably integrated with each other, and the strength as the reinforcing structure is further increased.

In this embodiment, the reinforcing reinforcing bars 17 are provided between the reinforcing steel bars 10 to 13 integrated in the axial direction and the existing columns 2. However, depending on the purpose, the reinforcing reinforcing bars 17 may not be provided. .
Further, in this embodiment, a belt-like fiber sheet is attached to the outer surfaces of the inner portion reinforcing steel plate 10, the walled portion reinforcing steel plates 11, 12 and the beam portion reinforcing steel plate 13, but this fiber A sheet may not be used. If a fiber sheet is affixed, the reinforcing steel plates 10-13 adjacent to the said axial direction can be integrated by this fiber sheet.

Further, in order to continuously integrate the reinforcing steel plates 10 to 13 in the axial direction, adjacent reinforcing steel plates may be connected by welding instead of bonding of fiber sheets.
However, the reinforcing steel plates 10 to 13 that are continuous in the axial direction can be integrated by the filled grout material 18 without integrating the reinforcing steel plates 10 to 13 by attaching or welding the fiber sheet. is there.

  The reinforcing structure of the present invention is useful for reinforcing a building having a very brittle column having a small effective inner height.

2 (extremely brittle) pillar 3 waist wall 4 drooping wall 5 window frame 6 (opening) base material 9 inner law-corresponding part 10 inner part reinforcing steel bar 11 walled part reinforcing steel bar 11a pillar enclosure 11b wall Creeping part 12 Reinforced steel plate 12a with wall part Column enclosure part 12b Walling part 15 Side board 18 Grout material

Claims (3)

It is provided with openings on both sides, and is a reinforcing structure of extremely brittle columns in which either one or both of the waist wall and the hanging wall are continuous on both sides,
The inner part of the inner part of the extremely brittle column other than the part corresponding to the waist wall or the drooping wall is a reinforcing steel plate for inner parts made up of a plurality of members in which the circumferential ends are overlapped in the circumferential direction. While enclosing with a predetermined interval,
The above-mentioned extremely brittle column other than the inner legal part, and a reinforcing steel plate for a walled part that reinforces the waist wall or the drooping wall continuous to the extremely brittle column other than the inner legal part,
This reinforced steel sheet for walled parts consists of a column enclosure that surrounds the extremely brittle column part other than the inner part at a predetermined interval, and a wall joint part that extends along the waist wall or the hanging wall on both sides of the extremely brittle column And consist of
The inner part reinforcing steel plate and the walled part reinforcing steel plate are integrated and continued in the axial direction of the extremely brittle column, the inner part reinforcing steel plate, the walled part reinforcing steel plate, and the extremely brittle column, Reinforced structure of extremely brittle columns filled with grout material between. Provided with an attachment plate protruding in the axial direction of the extremely brittle column on one of the reinforcing steel plate for inner part and the reinforcing steel plate for wall part adjacent to each other,
2. The extremely brittle column reinforcing structure according to claim 1, wherein the inner portion reinforcing steel plate and the walled portion reinforcing steel plate adjacent to each other are brought into contact with the accessory plate.   A strip-shaped sheet is affixed to the outside of the reinforcing steel sheet for inner part and the reinforcing steel sheet for wall part, and the reinforcing steel sheet for inner part and the reinforcing steel sheet for wall part are integrated by the strip sheet. Is a reinforcing structure of extremely brittle columns according to 2.

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