Column fixation structure and column fixation method

Abstract

To provide a column fixation structure and a column fixation method, allowing the size of a base part to be minimized, and capable of forming the base part into a shape concentrated around a column.SOLUTION: A column fixation structure comprises: a stud 3 arranged on a slab 21; a base part 4 connected on a lower end part of the stud 3 and arranged on an upper surface 211 of the slab 21; fixation members 5 arranged along a side surface 221 of a beam 22 supporting the slab 21 below the slab 21; anchor bolts 6 penetrating through the slab 21 to fix the base part 4 and the fixation members 5; and adhesive-based anchors 7 fixing the fixation members 5 to the beam 22 from the side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pillar fixing structure and a pillar fixing method. [Background technology]

[0002] Generally, when a steel pillar is placed on a concrete beam or foundation, a base plate provided at the base of the pillar is fixed to the beam or foundation with an anchor bolt (see, for example, Patent Document 1). When reinforcing an existing building for the purpose of strengthening earthquake resistance, etc., the existing building may be reinforced by installing steel studs and braces. In such cases, the base plate attached to the foot of the stud may be fixed to the beam with an adhesive anchor. An example of the adhesive anchor is Chemical Anchor (registered trademark). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-25288 A Summary of the Invention [Problem to be solved by the invention]

[0004] The brace action generates both compressive and tensile axial forces in the studs. For this reason, it is necessary to install many adhesive anchors to prevent cone-shaped destruction when tensile axial forces act on the studs. When the number of adhesive anchors increases, the base plate becomes larger accordingly. In addition, since the adhesive anchors are inserted into the beams, in order to install many adhesive anchors, they must be arranged in the longitudinal direction of the beams, and the base plate becomes elongated along the longitudinal direction of the beams. For this reason, there is a risk that equipment planned to be installed around the studs will interfere with the base plate and cannot be installed in the desired position.

[0005] Therefore, an object of the present invention is to provide a pillar fixing structure and a pillar fixing method that can minimize the size of the base part (base plate) and enable the shape of the base part to be concentrated around the pillar (partition stud). [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the column fixing structure of the present invention comprises a column provided on a slab, a base portion joined to the lower end portion of the column and provided on the upper surface of the slab, a fixing member provided below the slab along the side of a beam supporting the slab, an anchor bolt that penetrates the slab and fixes the base portion and the fixing member, and an adhesive anchor that fixes the fixing member to the beam from the side.

[0007] In order to achieve the above-mentioned objective, the method of fixing a column according to the present invention involves fixing a base portion joined to the lower end of a column and provided on the upper surface of a slab to a fixing member provided along the side of a beam supporting the slab below the slab with an anchor bolt that penetrates the slab, and fixing the fixing member to the beam from the side with an adhesive anchor.

[0008] In the present invention, the adhesive anchors for fixing the fixing member to the beam are inserted laterally into the beam below the slab, so that the strength against cone-shaped destruction can be increased and the number of adhesive anchors can be reduced compared to adhesive anchors inserted into the beam from above the slab. This allows the number of adhesive anchors arranged in the longitudinal direction of the beam to be reduced, and the longitudinal direction of the fixing member and the base member fixed to the fixing member can be reduced. As a result, the size of the base part can be minimized, and the shape of the base part can be concentrated around the column. In addition, in the present invention, the adhesive anchors for fixing the fixing member to the beam are inserted into the beam without the slab, so that the embedded length (insertion length) can be shortened compared to when the adhesive anchors are inserted into the beam via the slab, i.e., when they are inserted into the slab and the beam.

[0009] In order to achieve the above-mentioned object, the column fixing structure of the present invention comprises a column provided on a slab, a base portion joined to the lower end of the column and provided on the upper surface of the slab, a bracket joined to the column above the base portion, a fixing member provided below the slab along the side of a beam supporting the slab, a first adhesive anchor that fixes the base portion to the beam from above the slab, an anchor bolt that penetrates the slab and fixes the bracket and the fixing member, and a second adhesive anchor that fixes the fixing member to the beam from the side.

[0010] In order to achieve the above-mentioned object, in the method for fixing a column of the present invention, a base portion joined to the lower end of a column and provided on the upper surface of a slab is fixed from above the slab to a beam supporting the slab with a first adhesive anchor, a bracket joined to the column above the base portion is fixed to a fixing member provided along the side surface of the beam below the slab with an anchor bolt that penetrates the slab, and the fixing member is fixed to the beam from the side with a second adhesive anchor.

[0011] In the present invention, the base part is fixed by the first adhesive anchor, and the fixing member, which is connected to the bracket and anchor bolt connected to the column above the base part, is fixed to the beam below the slab by the second adhesive anchor. Therefore, the number of first adhesive anchors fixing the base part can be reduced compared to when only the base part is fixed to the beam from above the slab by the adhesive anchor. As a result, the size of the base part can be minimized, and the shape of the base part can be concentrated around the column. In addition, in the present invention, the second adhesive anchor fixing the fixing member to the beam is inserted into the beam without the slab, so the embedment length (insertion length) of the second adhesive anchor can be shortened compared to when the adhesive anchor is inserted into the beam via the slab, i.e., when it is inserted into the slab and the beam.

[0012] In addition, in the column fixing structure according to the present invention, a brace may be joined to the column.

[0013] With this configuration, the compressive and tensile forces acting from the brace can be reliably transmitted from the column to the beam. Effect of the Invention

[0014] According to the present invention, the size of the base portion can be minimized, and the shape of the base portion can be concentrated around the pillar. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a vertical cross-sectional view of the pillar fixing structure according to the first embodiment. [Diagram 2] FIG. 2 is a plan view of the pillar fixing structure according to the first embodiment. [Diagram 3] FIG. 3 is a view taken in the direction of the arrow B in FIG. 2. [Figure 4] FIG. 11 is a vertical cross-sectional view of a pillar fixing structure according to a second embodiment. [Diagram 5] 5 is a cross-sectional view taken along line CC in FIG. 4. [Figure 6] FIG. 5 is a cross-sectional view taken along line DD in FIG. [Figure 7] 7 is a cross-sectional view taken along line EE in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) Hereinafter, a pole fixing structure and a pole fixing method according to a first embodiment of the present invention will be described with reference to Figs. 1 to 3. The pillar fixing structure 1A and pillar fixing method according to the first embodiment shown in Figures 1 to 3 are a structure and method for fixing a stud 3 to an existing building 2 when reinforcing the existing building 2 by providing a stud 3 (pillar) and a brace (not shown).

[0017] The stud 3 is, for example, a steel column such as a steel frame column. The stud 3 in this embodiment is an H-shaped steel. The stud 3 is provided on the slab 21 of the existing building 2. The brace is joined to the stud 3. The brace is, for example, a steel material such as a shaped steel. A beam 22 that supports the slab 21 is provided below the slab 21. The stud 3 is provided overlapping the upper side of the beam 22 in the vertical direction. Hereinafter, the horizontal direction in which the beam 22 extends is referred to as the X direction. The horizontal direction perpendicular to the X direction in the width direction of the beam 22 is referred to as the Y direction. The two flanges 31, 31 of the stud 3 face each other in the X direction. The surface of the web 32 of the stud 3 faces the Y direction. The slab 21 is a concrete slab made of reinforced concrete, reinforced steel concrete, etc. The beam 22 is a concrete beam made of reinforced concrete, reinforced steel concrete, etc.

[0018] The column fixing structure 1A has a stud 3, a base 4, a fixing member 5, an anchor bolt 6, and an adhesive anchor 7. The base 4 is joined to the lower end of the stud 3, and is installed on the upper surface 211 of a slab 21. The fixing member 5 is provided along the side surface of a beam 22. The anchor bolt 6 fixes the base 4 and the fixing member 5. The adhesive anchor 7 fixes the fixing member 5 to the beam 22 from the side.

[0019] The base portion 4 is a steel member. The base portion 4 has a base plate 41, a first rib plate 42, and a second rib plate 43. The base plate 41 is a steel plate with a rectangular surface shape. The lower ends of the studs 3 are joined to the upper surface of the base plate 41. The studs 3 are joined to the center of the base plate 41 in a plan view. The base plate 41 is installed on the upper surface 211 of the slab 21 at a position vertically above the beam 22. The dimension of the base plate 41 in the Y direction is larger than the dimension of the beam 22 in the Y direction (beam width dimension). Both end portions 411, 411 of the base plate 41 in the Y direction are located outside the side surfaces 221, 221 of the beam 22 in the Y direction in a plan view. A plurality of holes 412 penetrating in the up-down direction are formed at both end portions 411, 411 of the base plate 41 at intervals in the X direction. Anchor bolts 6 are inserted into the holes 412.

[0020] The first rib plate 42 and the second rib plate 43 are joined to the upper surface of the base plate 41. The first rib plate 42 is joined to the center of the base plate 41 in the Y direction with its plate surface facing the Y direction. The first rib plates 42 are arranged on both sides of the stud 3 in the X direction. The second rib plates 43 are joined in plurality to the upper surface of the base plate 41 at intervals in the X direction with their plate surfaces facing the X direction. The ends of the first rib plate 42 and the second rib plate 43 that come into contact with the stud 3 are both joined to the stud 3.

[0021] The fixing member 5 has an L-shaped piece 51 and a rib plate 52. The L-shaped piece 51 is a steel member having an L-shaped cross section. The L-shaped piece 51 is a long member extending in the X direction, and is installed in an orientation that forms an L shape when viewed from the Y direction. The rib plate 52 is joined to both ends of the L-shaped piece 51 in the X direction.

[0022] The fixing member 5 is installed along the corner 23 formed by the lower surface 212 of the slab 21 and the side surface 221 of the beam 22. The fixing member 5 is provided on each of both sides in the Y direction of the beam 22. The fixing member 5 overlaps in the up-down direction with both end portions 411, 411 of the base plate 41 in the Y direction via the slab 21. The dimension of the fixing member 5 in the X direction is approximately the same as the dimension of the base portion 4 in the X direction. The L-shaped piece 51 has a first fixing piece 511 that is one side of the L-shaped cross-sectional shape and a second fixing piece 512 that is the other side.

[0023] The first fixing piece 511 is in contact with the lower surface 212 of the slab 21 with its plate surface facing the horizontal plane. The second fixing piece 512 is in contact with the side surface 221 of the beam 22 with its plate surface facing the Y direction. A corner 515 between the first fixing piece 511 and the second fixing piece 512 is disposed along the corner 23 formed by the side surface 221 of the beam 22. The first fixing piece 511 has a plurality of holes 513 penetrating in the up-down direction and spaced apart in the X direction. The anchor bolts 6 are inserted into the holes 513. The second fixing piece 512 has a plurality of holes 514 penetrating in the Y direction and spaced apart in the X direction. The adhesive anchors 7 are inserted into the holes 514. The first fixed piece 511 overlaps in the vertical direction with both end portions 411 in the Y direction of the base plate 41 via the slab 21. The second fixed pieces 512 of the fixing members 5 provided on both sides of the beam 22 in the Y direction face each other in the Y direction via the beam 22.

[0024] The anchor bolt 6 penetrates the slab 21 and fixes the base plate 41 of the base portion 4 and the first fixed piece 511 of the fixing member 5. The anchor bolt 6 is inserted into the hole 412 of the base plate 41 and the hole 513 of the first fixed piece 511. The anchor bolt 6 penetrates the hole 412 of the base plate 41, the slab 21, and the hole 513 of the first fixed piece 511 from above with the head 61 facing upward and the shaft 62 facing downward, and a nut 63 is fastened to the shaft 62 below the first fixed piece 511.

[0025] The adhesive anchor 7 fixes the second fixing piece 512 of the fixing member 5 to the beam 22. The adhesive anchor 7 is inserted into the hole 514 of the second fixing piece 512. The adhesive anchor 7 is inserted into the hole 514 of the second fixing piece 512 and the beam 22 from the Y direction. The adhesive anchor 7 fixes the fixing member 5 to the beam 22 in a position extending in the Y direction. The shaft 73 and the agent 74 (adhesive) of the adhesive anchor 7 are inserted inside the beam 22.

[0026] In the method for fixing a column according to the first embodiment, first, a stud 3 with a base portion 4 joined thereto is placed on a slab 21. A fixing member 5 is placed under the slab 21, and the base plate 41 and the fixing member 5 are fixed with an anchor bolt 6 that penetrates the slab 21. The fixing member 5 is fixed to a beam 22 with an adhesive anchor 7 whose shaft portion extends in the Y direction.

[0027] Next, the functions and effects of the pillar fixing structure and pillar fixing method according to the first embodiment will be described. In the column fixing structure 1A and column fixing method according to the first embodiment, the adhesive anchors 7 for fixing the fixing member 5 to the beam 22 are inserted laterally into the beam 22 below the slab 21, so that the strength against cone-shaped fracture can be increased and the number of adhesive anchors 7 can be reduced compared to the adhesive anchors 7 inserted into the beam 22 from above the slab 21. This allows the number of adhesive anchors 7 arranged in the X direction to be reduced, and the dimensions in the X direction of the fixing member 5 and the base plate 41 fixed to the fixing member 5 can be reduced. As a result, the size of the base plate 41 can be minimized, and the shape of the base part 4 can be concentrated around the stud 3. In addition, since the adhesive anchors 7 for fixing the fixing member 5 to the beam 22 are inserted into the beam 22 without the slab 21, the embedded length (insertion length) can be reduced compared to the case where the adhesive anchors are inserted into the beam 22 via the slab 21, i.e., the case where the adhesive anchors are inserted into the slab 21 and the beam 22. In the column fixing structure 1A according to the first embodiment, a brace is joined to the stud 3. In the column fixing structure 1A according to the first embodiment, the compressive force and tensile force acting from the brace can be reliably transmitted from the stud 3 to the beam 22.

[0028] Second embodiment Next, a second embodiment will be described. The same or similar members and parts as those in the first embodiment described above are designated by the same reference numerals, and the description will be omitted. Only the configurations different from the first embodiment will be described. As shown in FIG. 4, the pillar fixing structure 1B according to the second embodiment has a stud 3, a base portion 4B, a bracket 8, a fixing member 5B, an anchor bolt 6B, a first adhesive anchor 71, and a second adhesive anchor 72. As shown in Figs. 4 and 5, the base portion 4B has a base plate 41B. The base portion 4B of the second embodiment is not provided with a rib plate as in the base portion 4 of the first embodiment. The base plate 41B is formed in a flat plate shape and is installed on the upper surface 211 of the slab 21 with the plate surface oriented in a horizontal plane. The base plate 41 is disposed at a position overlapping the beam 22 upward. The dimension of the base plate 41 in the Y direction is approximately the same as the width dimension (dimension in the Y direction) of the slab 21. The partition 3 is joined to the center of the base plate 41B in a plan view. The base plate 41B is formed with a hole 413 penetrating in the vertical direction. The first adhesive anchor 71 is inserted into the hole 413.

[0029] As shown in Figs. 4, 6 and 7, the bracket 8 is a steel member having a C-shaped cross section. The bracket 8 extends in the Y direction and is joined to the stud 3 above the base portion 4B with the C-shaped cross section opening in the X direction. The bracket 8 has a first piece 81, a second piece 82 and a third piece 83. The first piece 81, the second piece 82 and the third piece 83 are each flat. The first piece 81 and the second piece 82 are each oriented such that their plate surfaces are horizontal, and the first piece 81 is disposed above the second piece 82. The third piece 83 is oriented such that its plate surface is a vertical surface facing the X direction, and its upper edge is connected to the end of the first piece 81 in the X direction and its lower edge is connected to the end of the second piece 82 in the X direction. In this embodiment, three brackets 8 are provided at intervals in the X direction. The three brackets 8 are denoted as a first bracket 84, a second bracket 85, and a third bracket 86 from one side to the other in the X direction.

[0030] The first bracket 84 has a C-shaped cross section that opens to one side in the X direction, and the third piece 83 is joined to the flange 31 on one side in the X direction of the partition 3. The third bracket 86 has a C-shaped cross section that opens to the other side in the X direction, and the third piece 83 is joined to the flange 31 on the other side in the X direction of the partition 3. The second bracket 85 has a C-shaped cross section that opens to the other side in the X direction. The second bracket 85 is divided into two in the Y direction. One divided piece 851 of the second bracket 85 is joined to the web 32 of the partition 3 from one side in the Y direction, and the other divided piece 852 is joined to the web 32 from the other side in the Y direction.

[0031] The three brackets 84-86 are disposed at the same height. The Y-direction dimension of each of the three brackets 84-86 is set to be greater than the Y-direction dimension of the base portion 4B. The Y-direction end portion of each of the three brackets 84-86 is disposed further outward in the Y-direction than the Y-direction end portion of the base portion 4B. Holes 811, 812 penetrating in the up-down direction are formed in the Y-direction ends of the first piece 81 and the second piece 82 of each of the three brackets 84-86. An anchor bolt 6B is inserted into the holes 811, 812.

[0032] As shown in FIG. 4 and FIG. 7, the fixing member 5B has an L-shaped piece 51 and a rib plate 52, similar to the fixing member 5 of the first embodiment. The first fixing piece 511 and the second fixing piece 512 of the L-shaped piece 51 have holes 513, 514, respectively. The fixing members 5B are provided in pairs on both sides of the beam 22 below the slab 21, arranged vertically. The upper fixing members 5B, which are arranged vertically, are provided along the corner 23 formed by the lower surface 212 of the slab 21 and the side surface 221 of the beam 22. The first fixing piece 511 of the lower fixing member 5B contacts the lower end of the second fixing piece 512 of the upper fixing member 5, and the second fixing piece 512 contacts the side surface of the slab 21.

[0033] 4 to 7, the anchor bolt 6B penetrates the slab 21 and joins the bracket 8 and the fixing member 5B. The anchor bolt 6B is inserted from above into a hole 811 in the bracket 8, penetrates the slab 21, and is inserted into holes 513 in the first fixing pieces 511 of the two fixing members 5B arranged side by side, one above the other. The anchor bolt 6B has nuts 63 fastened to its shaft portion 62 below the first fixing piece 511 of the upper fixing member 5 and above and below the lower first fixing piece 511.

[0034] The first adhesive anchor 71 fixes the base plate 41B from above to the beam 22. The first adhesive anchor 71 is inserted into the hole 413 of the base plate 41B, and is inserted into the slab 21 and the beam 22.

[0035] The second adhesive anchor 72 fixes the second fixing pieces 512 of the two upper and lower fixing members 5B to the beam 22. The adhesive anchor 7 is inserted into the hole 514 of the second fixing piece 512. The adhesive anchor 7 is inserted into the hole 514 of the second fixing piece 512 and the beam 22 from the Y direction. The adhesive anchor 7 fixes the fixing member 5 to the beam 22 in a position extending in the Y direction. The shaft 73 and drug 74 of the second adhesive anchor 72 are inserted inside the beam 22.

[0036] In the method for fixing a pillar according to the second embodiment, first, the stud 3 to which the base portion 4 and the bracket 8 are joined is placed on the slab 21. The base plate 41B of the base portion 4 is fixed to the beam 22 from above the slab 21 with the first adhesive anchor 71. A fixing member 5B is placed under the slab 21, and the bracket 8 and the fixing member 5B are fixed with an anchor bolt 6B that penetrates the slab 21. The fixing member 5B is fixed to the beam 22 with a second adhesive anchor 72 whose shaft portion extends in the Y direction.

[0037] In the column fixing structure 1B and column fixing method according to the second embodiment, the base portion 4 is fixed to the beam 22 from above the slab 21 by the first adhesive anchor 71, and the fixing member 5B, which is connected to the bracket 8 joined to the stud 3 above the base portion 4 by the anchor bolt 6B, is fixed to the beam 22 below the slab 21 by the second adhesive anchor 72. Therefore, the number of first adhesive anchors 71 for fixing the base portion 4 can be reduced compared to the case where only the base portion 4 is fixed to the beam 22 by the adhesive anchor. As a result, the size of the base portion 4 can be minimized, and the shape of the base portion 4 can be concentrated around the stud 3. In addition, the second adhesive anchor 72 for fixing the fixing member 5B to the beam 22 is inserted into the beam 22 without passing through the slab 21, and therefore the embedment length (insertion length) can be shortened compared to the case where the adhesive anchor is inserted into the beam 22 via the slab 21, i.e., the case where the adhesive anchor is inserted into the slab 21 and the beam 22.

[0038] The above describes the embodiments of the pillar fixing structure and pillar fixing method according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the present invention. For example, the column fixing structures 1A, 1B and column processing method of the above embodiment are adopted as the fixing structure and fixing method for the partition 3 to which a brace is joined, but they may be adopted as the fixing structure and fixing method for a column other than the partition 3, or as the fixing structures 1A, 1B and fixing method for a column to which a brace is not joined.

[0039] In the above embodiment, the stud 3 is a steel frame column made of H-shaped steel, but it may be a column made of steel other than H-shaped steel. The base portion 4 in the first embodiment may be composed of only the base plate 41, so long as it has a shape capable of fixing the anchor bolt 6. The base portion 4B in the second embodiment may be provided with a rib plate as in the first embodiment, so long as it has a shape capable of fixing the first adhesive anchor 71. In the above embodiment, the fixing members 5, 5B have a configuration including the L-shaped piece 51 and the rib plate 52, but may have other configurations as long as they are installed on the side of the beam 22, the anchor bolts 6, 6B can be fixed, and the fixing members 5, 5B can be fixed to the beam 22 by the adhesive anchor 7 and the second adhesive anchor 72. For example, the fixing members 5, 5B may be composed of only the L-shaped piece 51, or may be a steel material having a cross-sectional shape other than an L-shape, such as a C-shape, a square steel pipe, or the like.

[0040] In the above second embodiment, the bracket 8 is a steel material having a C-shaped cross section, but it may be a steel material having a cross section other than a C shape, such as an L-shape, or may be a square steel pipe. In the above embodiment, the beams 22 are concrete beams, but they may also be steel beams.

[0041] The Sustainable Development Goals (SDGs) are among the 17 international goals adopted at the United Nations Summit in September 2015. The pillar fixing structure and pillar fixing method according to this embodiment can contribute to achieving the 17 SDGs goals, such as goal 9. "Create infrastructural foundations for industry, innovation and sustainable development." [Explanation of symbols]

[0042] 1A,1B Fixed structure 3 Studs (pillars) 4,4B Base part 5,5B Fixing member 6,6B Anchor bolt 7 Adhesive anchors 8 Bracket 21 Slab 22 Beam 41,41B Base plate 71 First adhesive anchor 72 Second Adhesive Anchor 84 First Bracket 85 Second Bracket 86 3rd Bracket Above 211 Side 221

Claims

1. A column on the slab; A base portion joined to the lower end portion of the column and provided on the upper surface of the slab; A fixing member provided below the slab along a side surface of a beam supporting the slab; An anchor bolt that penetrates the slab and fixes the base portion and the fixing member; A column fixing structure having an adhesive anchor that fixes the fixing member to the beam from the side.

2. A column on the slab; A base portion joined to the lower end portion of the column and provided on the upper surface of the slab; A bracket joined to the pillar above the base portion; A fixing member provided below the slab along a side surface of a beam supporting the slab; a first adhesive anchor that secures the base portion to the beam from above the slab; An anchor bolt that penetrates the slab and fixes the bracket and the fixing member; A column fixing structure having a second adhesive anchor that fixes the fixing member to the beam from the side.

3. The column fixing structure according to claim 1 or 2, wherein a brace is connected to the column.

4. A base portion connected to the lower end of the column and provided on the upper surface of the slab is fixed to a fixing member provided along the side of a beam supporting the slab below the slab with an anchor bolt penetrating the slab; A method for fixing a column in which the fixing member is fixed to the beam from the side with an adhesive anchor.

5. A base portion joined to the lower end portion of the column and provided on the upper surface of the slab is fixed to a beam supporting the slab from above the slab with a first adhesive anchor; A bracket joined to the column above the base portion is fixed to a fixing member provided along a side surface of the beam below the slab with an anchor bolt penetrating the slab; A method for fixing a column, comprising fixing the fixing member to the beam from the side with a second adhesive anchor.

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