JP6466196B2 - Reinforcement structure and reinforcement method for existing columns - Google Patents

Description

  The present invention relates to a reinforcing structure or the like for seismic reinforcement of an existing column.

  In order to prevent the collapse of the structure due to an earthquake, a structure such as a pillar is required to have a seismic strength of a predetermined level or more. However, since structures that were constructed before the current seismic standards were not required to be as severe as current seismic strength, the old structures may not meet the current seismic standards.

  However, it takes time and cost to newly rebuild all structures such as pillars. For this reason, the method of reinforcing the existing pillar is taken.

  As a method of reinforcing such an existing column, there is a method of constructing a reinforced concrete root winding portion by placing concrete around the column base portion of the existing column (for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-018424

  FIG. 6 is a side view showing the column reinforcing structure 100. The existing pillar 101 is an assembly pillar (truss pillar), for example, and is disposed on the base plate 103. The base plate 103 is fixed to the foundation 107 with anchor bolts 105. The base plate 103 is provided with reinforcing ribs 109. The column reinforcement structure 100 covers a predetermined height of the column base of the existing column 101 with concrete 113 in which a reinforcing bar 111 is embedded.

  However, in such a root winding column base method, it is general that the cross-sectional area of the concrete 113 is at least twice the cross-section of the existing column portion, and the height of the concrete 113 is also about 2 m. For this reason, in a factory etc., there is a problem that the usable range around the existing pillar 101 is limited and the passage is narrowed.

  Further, since it is completely buried by the concrete 113, for example, even when the existing column 101 is an assembly column as shown in the drawing, the field of view is blocked and the other side of the existing column cannot be visually recognized.

  This invention is made | formed in view of such a problem, and it aims at providing the reinforcement structure of the existing pillar etc. which minimizes the increase in the area of an existing pillar.

  In order to achieve the above-described object, the first aspect of the present invention includes a reinforcing plate fixed to a foundation to which a base plate of an existing column is fixed, and at least a pair of members that are joined to the reinforcing plate and arranged outside the existing column. A reinforcing structure for an existing column comprising: a reinforcing column; and a joining plate that connects the reinforcing columns to each other and is joined to at least a part of an outer surface of the existing column.

  Concrete may be cast so as to cover the reinforcing plate.

  In this case, the reinforcing plate may be fixed to the foundation with a plurality of anchor bolts, reinforcing bars may be installed in a direction substantially perpendicular to the anchor bolts, and the reinforcing bars may be embedded in the concrete.

  The existing pillar may be an assembly pillar.

  According to the first invention, a new reinforcing column is provided outside the existing column, and a part of the stress received by the existing column is transmitted to the reinforcing column by joining a part of the reinforcing column and the existing column. It is possible to reinforce existing pillars. At this time, unlike the pierced column piercing method, which is reinforced with concrete, it is reinforced with a reinforcing column, so it can be constructed on the outer periphery of an existing column. For this reason, the increase in the cross-sectional area of the column can be minimized.

  In addition, by placing the concrete so as to cover the reinforcing plate, the joint portion between the reinforcing plate and the reinforcing column can be reinforced. In this case, it is sufficient that the reinforcing plate or the like can be covered, so that it is not necessary to place concrete at a height of several meters unlike the root winding column base method.

  Moreover, the reinforcement of the lower part of a reinforcement pillar can be more reliably performed by embedding a reinforcing bar in concrete.

  Further, when the existing column is an assembly column, the field of view is not blocked by the reinforcing column.

  According to a second aspect of the present invention, there is provided a step of fixing a reinforcing plate having at least a pair of reinforcing columns fixed to a foundation on which a base plate of an existing column is fixed, and arranging the reinforcing columns on the outside of the existing columns; And a step of joining the joining plate to at least a part of the outer surface of the existing pillar.

  Furthermore, you may comprise the process of placing concrete so that the said reinforcement board may be covered.

  Before placing the concrete, a step of installing a reinforcing bar in a direction substantially perpendicular to an anchor bolt for fixing the reinforcing plate to the foundation may be provided, and the reinforcing bar may be embedded in the concrete.

  According to the second invention, the existing pillar can be easily reinforced. At this time, an increase in the cross-sectional area of the column can be minimized.

  ADVANTAGE OF THE INVENTION According to this invention, the reinforcement structure of the existing pillar etc. which minimizes the increase in the area of an existing pillar can be provided.

The side view which shows the reinforcement structure 1 of a pillar. It is AA sectional view taken on the line of FIG. 1, Comprising: Sectional drawing which shows the reinforcement structure 1 of a pillar. The side view which shows the reinforcement structure 1a of a pillar. FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3 and showing a column reinforcing structure 1a. Sectional drawing which shows the reinforcement structure 1b of a pillar. The figure which shows the reinforcement structure 100 of the conventional pillar.

  Hereinafter, a column reinforcing structure 1 according to an embodiment of the present invention will be described. FIG. 1 is a side view showing a column reinforcing structure 1, and FIG. 2 is a cross-sectional view taken along line AA of FIG. The column reinforcing structure 1 includes a reinforcing column 5 formed on the outer periphery of the existing column 3.

  The existing pillar 3 is an assembly pillar constituted by a plurality of trusses, for example, but may be a prismatic pillar or an H steel pillar. When the existing pillar 3 is an assembly pillar, the back side of the pillar can be visually recognized.

  The existing pillar 3 is constructed on the foundation 23. On the base 23, the base plate 11 is fixed with anchor bolts 13. On the base plate 11, the reinforcing ribs 21 are joined vertically and horizontally, and the existing pillar 3 having a substantially L-shaped cross section is joined to the inside of the reinforcing ribs 21. When the existing pillar 3 is an assembly pillar, the existing pillars 3 are further joined by a plurality of trusses.

  The reinforcing plate 9 is disposed on the base plate 11 with respect to the existing pillar 3 configured as described above. For example, as illustrated in FIG. 2, the reinforcing plate 9 is a substantially rectangular member, and is disposed outside the reinforcing rib 21 on the short side of the base plate 11. That is, the reinforcing plate 9 is disposed avoiding interference with the reinforcing ribs 21 and the anchor bolts 13 on the base plate 11.

  The reinforcing plate 9 is provided with a hole, and is fixed to the foundation 23 by a reinforcing anchor bolt 15. The position and number of reinforcing anchor bolts 15 are not limited to the illustrated example, and any position may be used as long as interference with other anchor bolts 13 on the base plate 11 can be avoided. Further, the reinforcing anchor bolt 15 may be fixed by a notch that opens to the outer peripheral side, instead of forming a hole in the reinforcing plate 9. In this case, it is desirable to increase the thickness of the washer.

  A reinforcing column 5 is joined on the reinforcing plate 9. The reinforcing column 5 may be bonded to the reinforcing plate 9 in advance, or the reinforcing column 5 may be bonded on the reinforcing plate 9 in the field. By joining the reinforcing column 5 to the reinforcing plate 9 in advance, the welding work at the site can be reduced and the joining can be performed with higher accuracy.

  At least a pair of reinforcing pillars 5 are arranged. In the example shown in FIG. 2, the reinforcing pillars 5 are arranged at four places, two on each of the outer sides on the short side of the existing pillar 3. Further, in the illustrated example, the reinforcing pillar 5 is a substantially U-shaped member, for example, and is arranged so that the opening side faces inward.

  After the reinforcing pillars 5 are installed, adjacent reinforcing pillars 5 are connected to each other by a joining plate 7 at a predetermined height. The joining plate 7 exhibits a function of preventing buckling of the reinforcing column 5. Note that the joining plate 7 may be provided at one place or at a plurality of places.

  In addition, although the shape and arrangement | positioning of the reinforcement pillar 5 are not restricted to the example shown in figure, it is desirable for the side surface which the reinforcement pillars 5 which mutually oppose correspond to be arrange | positioned on a substantially straight line. Specifically, in the illustrated example, the respective surfaces C and C of the pair of reinforcing pillars 5 arranged on the same side and parallel to the direction of arrangement are arranged on a substantially straight line and arranged on opposite sides. It is desirable that the surfaces D and D of the pair of reinforcing pillars 5 that are parallel to each other in the opposing direction are arranged on a substantially straight line. By using these surfaces, the connection by the joining plate 7 is facilitated.

  All the existing pillars 3 are at least partially joined to the joining plate 7. For example, in FIG. 1, the intersection of the existing pillar 3 and the joining plate 7 is welded together. By doing in this way, the stress of the existing pillar 3 can be transmitted to the reinforcing pillar 5. In addition, since the stress will be transmitted if the joining of the joining plate 7 and the existing pillar 3 is joined at least one place, it is not necessary to weld all the intersections.

  Further, in order to easily join the joining plate 7 and the existing pillar 3, for example, the reinforcing pillar 5 is arranged so that a part of the surface of the existing pillar 3 coincides with the straight line connecting the aforementioned surfaces D and D. It is desirable to arrange. In this case, the joining plate 7 facilitates joining between the reinforcing pillars 5 and joining the existing pillars 3.

  The reinforcing pillar 5 may have a height of about 1 to 2 m, for example. This is because the reinforcing column 5 only needs to reinforce only a portion where the existing column 3 receives a large moment.

  As described above, according to the present embodiment, the structure is simple and the construction period can be shortened as compared with the conventional neckline column base method. Moreover, compared with what covers the whole existing column with a reinforced concrete, the increase in the cross-sectional area of a column can be suppressed to the minimum.

  Moreover, when the existing pillar 3 is an assembly pillar, even if the reinforcement pillar 5 is installed, the other side of the pillar can be visually recognized.

  Next, a second embodiment will be described. 3 is a side view (partial perspective view of the concrete 19) showing the column reinforcing structure 1a according to the second embodiment, and FIG. 4 is a sectional view taken along line BB of FIG. 3 (perspective view of the concrete 19). Figure). In the following description, the same functions as those of the column reinforcing structure 1 are denoted by the same reference numerals as those in FIGS. The column reinforcement structure 1 a is substantially the same as the column reinforcement structure 1, but is different in that the reinforcement plate 9 and the like are embedded in the concrete 19.

  The concrete 19 is placed after the reinforcement pillar 5 is installed. The concrete 19 embeds a fixing portion of the reinforcing plate 9 and the reinforcing anchor bolt 15 and a joint portion between the reinforcing plate 9 and the reinforcing column 5. For this reason, the lower end part vicinity of the reinforcement pillar 5 can be reinforced.

  When placing concrete 19, it is desirable to embed a reinforcing bar 17 inside. In this case, the upper end of the anchor bolt 15 for reinforcement is projected on the reinforcing plate 9 by about 50 to 200 mm (to the extent that it is embedded in the concrete 19). A nut is attached as a fixing portion in the vicinity of the upper end portion of the protruding reinforcing anchor bolt 15. Further, an annular reinforcing bar 17 is installed in the fixing portion substantially horizontally (in a direction substantially perpendicular to the reinforcing anchor bolt 15).

  The concrete 19 reinforces the vicinity of the joint between the reinforcing column 5 and the reinforcing plate 9. For this reason, it is sufficient to form to a height of about 100 to 200 mm. For this reason, the part where the cross-sectional area of the column increases is limited to the lower end of the reinforcing column 5 and does not hinder traffic and visibility.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Moreover, since the most stressed site | part of the lower end part of the reinforcement pillar 5 is reinforced with the concrete 19, the existing pillar 3 can be reinforced more reliably. Moreover, since the concrete 19 reinforces only the lower end part of the reinforcement pillar 5, visibility etc. are not disturbed.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the shape and arrangement of the reinforcing plate 9 are not limited to the example described above. FIG. 5 is a cross-sectional view showing a column reinforcing structure 1b. The column reinforcing structure 1b is substantially the same structure as the column reinforcing structure 1, but the form of the reinforcing plate 9a is different. The reinforcing plate 9 a is disposed so as to surround the periphery of the base plate 11. In this case, the reinforcing plate 9a is processed so as not to interfere with the reinforcing rib 21.

  The reinforcing plate 9a is composed of a pair of substantially U-shaped members. In addition, each reinforcement board 9a may join a mutual butting part, and does not need to join. By doing in this way, the freedom degree of arrangement | positioning of the reinforcement pillar 5 and arrangement | positioning of the reinforcement anchor bolt 15 can be raised. Thus, in the present invention, the arrangement and shape of the reinforcing plate can be appropriately designed according to the arrangement of the reinforcing pillars 5 and the arrangement of the anchor bolts 15 for reinforcement.

DESCRIPTION OF SYMBOLS 1, 1a, 1b ......... Column reinforcing structure 3 ......... Existing column 5 ......... Reinforcing column 7 ......... Joint plate 9, 9a ......... Reinforcement plate 11 ......... Base plate 13 ......... Anchor bolt 15 ......... Reinforcement anchor bolt 17 ......... Reinforcing bar 19 ... Concrete 21 ......... Reinforcement rib 23 ......... Base 100 ......... Pillar reinforcement structure 101 ...... Existing pillar 103 ......... Base plate 105 ... ... Anchor bolt 107 ... Foundation 109 ... Reinforcing rib 111 ... Reinforcing bar 113 ... Concrete

Claims (7)

A reinforcing plate fixed to a foundation on which a base plate of an existing pillar is fixed;
At least a pair of reinforcing columns joined to the reinforcing plate and disposed outside the existing columns;
A joining plate that connects the reinforcing pillars and is joined to at least a part of the outer surface of the existing pillar;
A structure for reinforcing an existing pillar, comprising:   2. The existing column reinforcement structure according to claim 1, wherein concrete is placed so as to cover the reinforcement plate. The reinforcing plate is fixed to the foundation with a plurality of anchor bolts,
Reinforcing bars are installed in a direction substantially perpendicular to the anchor bolt,
The reinforcing structure for an existing column according to claim 2, wherein the reinforcing bar is embedded in the concrete.   The reinforcing structure for an existing column according to any one of claims 1 to 3, wherein the existing column is an assembly column. Fixing a reinforcing plate on which at least a pair of reinforcing columns are fixed to a foundation on which a base plate of an existing column is fixed, and placing the outer side of the existing columns;
Connecting the reinforcing columns with a bonding plate, and bonding the bonding plate to at least a part of the outer surface of the existing column;
A method for reinforcing an existing pillar, comprising:   6. The method for reinforcing an existing column according to claim 5, further comprising a step of placing concrete so as to cover the reinforcing plate. Before placing the concrete, comprising the step of installing a reinforcing bar in a direction substantially perpendicular to the anchor bolt for fixing the reinforcing plate to the foundation;
The method for reinforcing an existing column according to claim 6, wherein the reinforcing bar is embedded in the concrete.

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