JP2017089304A - Column form for column base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent destruction of a column form that results from thrusting of a side surface in a cone shape, the destruction being caused by shear force exerted on an anchor bolt.SOLUTION: A reinforced concrete column form (20) supports a column base from below, and includes a plurality of anchor bolts (21), a plurality of main reinforcements (23) arranged to surround the plurality of anchor bolts from outside and extending in a vertical direction, and a plurality of hoop reinforcements (24) arranged in the vertical direction leaving an interval and surrounding the plurality of main reinforcements from further outside. The column form further includes an auxiliary reinforcement (25) located inside of the plurality of main reinforcements and embedded in the column form at a height position coinciding with, or higher than, the hoop reinforcement at a highest position (24h), the auxiliary reinforcement further including an inner side portion engaging with the anchor bolt and an inside portion extending inward into the column form from the inner side portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete foundation that supports a steel column.

  Steel buildings have steel columns, steel beams, and concrete foundations. The concrete foundation connected to and supporting the column base of a steel column is a reinforced concrete structure called a column type. Conventionally, as an exposed column base that is not embedded in concrete and a column type that supports the exposed column base, for example, JP 2001-207461 A (Patent Document 1) and JP 2002-146923 A (Patent Document). Those described in 2) are known. In the technique described in Patent Document 1, a sheath tube is embedded in a reinforced concrete foundation. Anchor bolts are attached and fixed in advance to the steel column bases, and the anchor bolts are suspended and inserted into the sheath tube. Then, the grout material is filled in the gap between the sheath tube and the anchor bolt. In addition, the riser around the anchor bolt is omitted.

  In the technique described in Patent Document 2, a fixing metal member having a large diameter is joined to a base portion of an anchor bolt by welding, and a buffer member is disposed on the upper surface of the fixing metal material, and is embedded in a reinforced concrete foundation. This improves the cone fracture resistance when the anchor bolt is pulled out.

JP 2001-207461 A JP 2002-146923 A

  The force acting on the anchor bolt from the steel column is not only a pulling force but also a shearing force. A conventional column shape is shown in FIG. The column mold 100 includes concrete 100c, a rising bar 101 embedded in the concrete 100c, a hoop bar 102, and an anchor bolt 21. When a shearing force Fs in the outer direction (referring to the direction from the inner side to the outer side of the column mold 100, hereinafter the same) is applied from the column base 10 to the upper end portion of the anchor bolt 21, the upper end portion of the anchor bolt 21 is the side surface of the column mold 100. This causes the concrete to be pushed out to the outside, causing horizontal cone-like breakage in the side surface portion of the column mold 100. For reference, FIG. 13 schematically shows a cone-shaped fracture portion C.

  In particular, when the upper end portion of the rising muscle 101 at the four corners is formed in an inverted U shape, the hoop muscle 102 must be disposed below the upper end portion of the rising muscle. That is, the hoop muscle 102 h arranged at the highest position is arranged at the uppermost position of the straight line portion of the rising muscle 101. Then, the hoop line 102h is shifted to the lower side of the cone-shaped broken part C, and the horizontal cone-shaped broken part C cannot be handled by the hoop line 102h.

  During an earthquake, the shear force Fs becomes significant. For this reason, the conventional column type 100 made of reinforced concrete needs to ensure sufficient strength so as not to cause horizontal cone-like fracture, and has only to increase the concrete volume surrounding a plurality of anchor bolts. If it does so, the burden on construction and cost will become large.

  In view of the above-described circumstances, an object of the present invention is to provide a columnar structure capable of improving the proof strength of an anchor bolt against a shearing force without increasing the size of a column made of reinforced concrete.

  For this purpose, the column type of the column base according to the present invention is arranged so as to surround the plurality of anchor bolts and the plurality of anchor bolts extending in the vertical direction so as to correspond to the holes provided in the outer edge of the column base. In the column type made of reinforced concrete, which is provided with a plurality of main bars extending in the vertical direction and a plurality of hoops arranged at intervals in the vertical direction and further surrounding the main bars from the outside, and supporting the column base from below. An outer portion that is embedded in the column shape so as to be at a height position that overlaps with the hoop muscle arranged at the highest position or at a higher position inside the plurality of main bars, and an outer portion And a reinforcing bar having an inner portion extending from the inner side of the column shape toward the inner side of the column shape.

  According to the present invention, the reinforcing bars embedded in the upper end portion of the column mold even when the outer side shearing force acts on the upper end portion of the anchor bolt and the side surface portion of the column mold is likely to be pushed outward. Receives shearing force. Therefore, it is possible to prevent the cone-shaped destruction of the side surface portion of the column type. The outer portion of the reinforcing bar that engages with the anchor bolt means that the outer portion of the reinforcing bar is caught by the anchor bolt.

  The shape of the reinforcing bar is not particularly limited, and can take a wide variety of shapes. The reinforcing bar has, for example, a shape that opens toward the inside of the column base and closes to the outside of the column base in a plan view, and restricts the outer movement of the anchor bolt. Alternatively, the reinforcing bar may have a shape such as a ring that not only closes to the outside of the column base but also closes to the inside of the column base. As one embodiment of the present invention, the reinforcing bar is a bar material including a bent central portion and both ends extending opposite to each other. The central portion engages with an anchor bolt, and both ends are columnar than the central portion. It is buried so as to be inside. According to this embodiment, a reinforcing bar can be created with a simple shape such as a U-shape, with the central portion of the bar as the outer portion and both ends of the bar as the inner portion. Reinforcing bars can be easily created simply by bending bars such as deformed bars. Both ends of the reinforcing bar may extend in a V shape. Alternatively, the reinforcing bars may have different lengths at both ends, such as an L shape. In another embodiment, the reinforcing bar may be a saddle shape such as a J-shape. As another embodiment, a strip-shaped metal object may be prepared, a plurality of through holes may be formed in the longitudinal direction of the metal object, and an anchor bolt may be engaged with the through hole formed at one end of the metal object. As a result, the remaining through-holes of the hardware are filled with concrete, and the hardware firmly adheres to the concrete of the column base.

  The reinforcing bar is desirably provided on all anchor bolts. The reinforcing bars provided on each anchor bolt may be separated from each other, or may be joined. As a preferred embodiment of the present invention, the reinforcing bar is a bar including a central region and bent end regions, and one end region is engaged with one anchor bolt and the other end region is the other. Engage with the anchor bolt. According to this embodiment, two anchor bolts can be reinforced with one reinforcing bar, and the number of reinforcing bars can be halved. As another embodiment, one reinforcing bar may engage with three or more anchor bolts.

  The posture of the reinforcing bar is not particularly limited. As one embodiment of the present invention, a reinforcing bar relates to a plurality of anchor bolts arranged in a square shape including a vertical side and a horizontal side, and engages with the anchor bolts arranged in the corners and extends in a diagonal direction. According to this embodiment, the anchor bolt arrange | positioned at the corner | angular part of a column shape can be reinforced with the reinforcing bar extended diagonally. Alternatively, when both ends of the reinforcing bar are respectively engaged with the anchor bolt, the central region of the reinforcing bar extends inside the column shape, so that both ends of the reinforcing bar are the outer portion and the central region of the reinforcing bar is the inner portion. be able to.

  Alternatively, as another embodiment, the reinforcing bars are vertically engaged by engaging with anchor bolts arranged in the middle between adjacent corners, with respect to a plurality of anchor bolts arranged in a rectangular shape including vertical sides and horizontal sides. Extending in the direction and / or lateral direction. According to this embodiment, the anchor bolt arrange | positioned in the middle of the column-shaped corners can be reinforced with the reinforcing bar extended in the vertical direction and / or the horizontal direction. Alternatively, when both ends of the reinforcing bar are respectively engaged with anchor bolts arranged between the corners of the column type, the central region of the reinforcing bar extends inside the column type. The central region of the reinforcing bar can be the inner portion. In another embodiment, the reinforcing bars may be bent at some points in the central region, extending in a diagonal direction in part, and extending in the vertical direction and / or the horizontal direction in the other part.

  Alternatively, as another embodiment, the reinforcing bars are obliquely engaged with the anchor bolts arranged in the middle between adjacent corners with respect to a plurality of anchor bolts arranged in a square shape having a vertical side and a horizontal side. It may extend in the direction.

  The outer part of the reinforcing bar engages with one anchor bolt. Alternatively, as another embodiment, the outer portion of the reinforcing bar extends along the side surface of the column base and engages at least two anchor bolts.

  In addition to the above-described embodiment, the column type of the column base according to the present invention includes a plurality of anchor bolts arranged in correspondence with bolt holes provided in the outer edge of the column base and extending in the vertical direction, and a plurality of anchor bolts on the outside. Made of reinforced concrete that has a plurality of main bars arranged so as to surround from the top and extending in the vertical direction, and a plurality of hoop bars arranged at intervals in the vertical direction and surrounding the plurality of main bars from the outside, and supporting the column base from below In the column type, the anchor bolts are embedded in the column type so that they are on the inner side of the arrangement of the plurality of main bars and overlap with the hoop muscle arranged at the highest position or at a higher position. It further comprises a closed reinforcing bar that surrounds from the outside.

  According to such an embodiment, since the closed type reinforcing bars that surround the arrangement of the anchor bolts from the outside are provided, the outward shearing force acting on the upper end portion of the anchor bolts can be received by the closed type reinforcing bars. Therefore, it is possible to prevent the cone-shaped destruction of the side surface portion of the column type. The closed-type reinforcing bars are formed in accordance with the arrangement of the anchor bolts by bending one reinforcing bar at several points along the way. At this time, both ends of the reinforcing bar are bent so as to overlap. For example, a rectangular reinforcing bar is created by bending a single reinforcing bar at four points in the middle and overlapping both ends. Alternatively, the closed-type reinforcing bars may be added by overlapping the ends of several reinforcing bars. For example, four L-shaped reinforcing bars are prepared, and end portions are overlapped and added to form a square reinforcing bar. The closed reinforcing bar is preferably in direct contact with the anchor bolt.

  Conventionally, the upper end of the main bar arranged at the corner of the column shape is formed in an inverted U shape. Alternatively, as another embodiment, a fixing hardware may be provided at the upper end of the main bar, and the hoops may be disposed adjacent to the lower side of the fixing metal. According to this embodiment, compared with the case of the main muscle of an inverted U shape, a hoop line | wire can be arrange | positioned more upwards. Accordingly, the uppermost hoop line is arranged so as to overlap the aforementioned cone-shaped fracture portion C, and the outer direction shearing force acting on the upper end portion of the anchor bolt can be received by the uppermost hoop line.

  As described above, according to the present invention, it is possible to improve the proof stress against the shearing force in the outer direction acting on the anchor bolt without increasing the concrete volume of the columnar shape as in the prior art.

It is a longitudinal section showing a 1st embodiment of the present invention. It is a top view which shows 1st Embodiment. It is a cross-sectional view which shows 1st Embodiment. It is a cross-sectional view which shows 1st Embodiment. It is a top view which shows typically the column type | mold which becomes 2nd Embodiment of this invention. It is a side view which shows typically 2nd Embodiment of this invention. It is a top view which shows typically the column type | mold which becomes 3rd Embodiment of this invention. It is a top view which shows typically the column shape which becomes 4th Embodiment of this invention. It is a top view which shows typically the column type | mold which becomes 5th Embodiment of this invention. It is a top view which shows typically the column type | mold which becomes 6th Embodiment of this invention. It is a top view which shows typically the column type | mold which becomes 7th Embodiment of this invention. It is a side view which shows typically 8th Embodiment of this invention. It is a side view which shows the conventional exposed column base and column type typically.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a column mold according to a first embodiment of the present invention, and is shown together with an exposed column base. FIG. 2 is a plan view showing the column mold and the exposed column base according to the first embodiment, and shows a state seen from II-II in FIG. FIG. 3 is a transverse sectional view showing the first embodiment, and shows a state in which the section is cut along III-III in FIG. FIG. 4 is a transverse cross-sectional view showing the first embodiment, and shows a state in which the cross section is cut along IV-IV in FIG.

  The first embodiment has a basic configuration as the present invention. The column base 10 is an exposed column base similar to the conventional one, and includes a column member 11 and a base plate 12. The column member 11 is, for example, a steel square pipe, or an H-shaped steel (not shown). A plate-like base plate 12 is coupled to the lower end of the column member 11 extending in the vertical direction. The base plate 12 is a horizontal rectangular plate material, and holes 13 through which anchor bolts 21 are passed are formed at four corners of the base plate 12.

  The column type 20 is a foundation made of reinforced concrete, and is integrally coupled to a foundation beam 31 extending in the vertical direction and the horizontal direction in a horizontal posture. As shown in FIG. 1, the column shape 20 is formed in two stages including an upper stage of a small square and a lower stage of a large square, but it may be a rectangular parallelepiped having no level difference. The unevenness of the upper surface of the column 20 is adjusted horizontally by the mortar 22.

  A plurality of anchor bolts 21 are arranged to correspond to the arrangement of the holes 13 and extend in the vertical direction. The anchor bolt 21 is embedded in the concrete 20c of the column mold 20 except for the upper end portion. A fixing hardware 26 having a size larger than the outer diameter of the large anchor bolt 21 is fixed to the lower end of the anchor bolt 21. A male screw is formed on the outer periphery of the upper end portion of the anchor bolt 21 protruding upward from the mortar 22.

  In order to ensure the strength of the column mold 20, as shown in FIG. 1 and FIG. 3, main bars 23 (rise bars) and hoop bars 24 are further embedded in the concrete 20 c at the side edges of the column mold 20.

  The plurality of main bars 23 are arranged so as to surround the four anchor bolts 21 from the outside and extend in the vertical direction. The main bars 23 of the present embodiment are embedded in the four corners of the column shape. The upper end portion of each main bar 23 is formed in an inverted U shape and firmly fixed to the upper concrete 20c. The lower end of each main bar 23 is bent and formed in an L shape, and firmly fixed to the lower concrete 20c.

  The hoop bars 24 are installed in a square frame shape and surround the plurality of main bars 23 from the outside. A plurality of hoop lines 24 are arranged at intervals in the vertical direction. The distance (cover) from the hoop line 24 to the columnar side surface 20f is sufficiently and sufficiently secured.

  All the hoop muscles 24 are arranged below the upper end of the inverted U shape of the main muscle 23. That is, the uppermost hoop line 24 h does not cover the arc-shaped portion at the upper end of the main line 23.

  In the present embodiment, reinforcing bars 25 are further embedded in the concrete 20c of the columnar mold 20. As shown in FIG. 4, the reinforcing bar 25 has an outer portion 25 f near the side surface 20 f of the columnar mold 20 and an inner portion 25 c near the center of the columnar mold 20 in plan view. The outer portion 25f is engaged with the anchor bolt 21. The outer portion 25f is preferably in direct contact with the anchor bolt 21, but may be separated within a range of more than 0 mm and not more than 100 mm. In any case, the outer portion 25f is disposed outside the anchor bolt 21.

  The reinforcing bar 25 of the present embodiment is made of deformed bar steel, like the main bar 23 and the hoop bar 24, and is formed by bending the center of a straight bar into a U shape. That is, the reinforcing bar 25 is a bar having a U-shape at the center and extending at both ends facing each other, and is engaged with the anchor bolt 21 at the outer portion 25f that becomes the center of the U-shape. The inner portion 25c is embedded so as to be inside the column mold 20 rather than the central portion. Specifically, the semicircular outer portion 25 f is engaged so as to wrap around the outer periphery of the anchor bolt 21, thereby preventing the anchor bolt 21 from moving outside the column mold 20.

  The curvature of the inside of the outer portion 25f that extends in a curved manner is naturally larger than the diameter of the anchor bolt 21, but it is better that the curvature is smaller, and is preferably 1 to 4 times the diameter of the anchor bolt 21. The length of the inner portion 25c may reach the center of the column mold 20, or may be shorter than that, and preferably extends in a straight line with the diameter of the reinforcing bar 25 being four times or more.

  When the side close to the side surface 20f of the column mold 20 in the plan view is defined as the outside, and the side close to the center of the column mold 20 is defined as the inside, the main bar 23 and the hoop bar 24 are the side surfaces of the column mold 20 as shown in FIG. The anchor bolt 21 is disposed outside the main bar 23 and the hoop bar 24, and the outer portion 25 f of the reinforcing bar 25 is disposed outside the anchor bolt 21 and the reinforcing bar 25. The inner portion 25c is disposed inside the anchor bolt 21. The outer diameter of the reinforcing bar 25 is preferably equal to or smaller than the outer diameter of the main bar 23, but is not limited thereto. The outer diameter of the reinforcing bar 25 is preferably equal to or smaller than the outer diameter of the anchor bolt 21, but is not limited thereto.

  The reinforcing bars 25 are embedded in the concrete 20c of the column mold 20 so as to be at a height position overlapping with the hoop bars 24h arranged at the highest position or at a higher position. The reinforcing bars 25 are embedded in a horizontal posture. However, as a modification (not shown), the outer portion 25f may be at a height position or a higher position where it overlaps with the hoop muscle 24h, and the inner portion 25c may be lower than the outer portion 25f. .

  When the column type 20 made of reinforced concrete is constructed, the column base 10 is disposed above the column type 20, and the upper end portion of the anchor bolt 21 is inserted into each hole 13 of the column base 10. A mortar 22 is filled between the lower surface of the base plate 12 and the upper surface of the column mold 20. The nut 27 is screwed onto the upper end portion of the anchor bolt 21 from the upper side of the base plate 12, and the column base 10 is connected and fixed to the column mold 20. A washer 33 is preferably interposed between the nut 27 and the base plate 12, but the washer 33 can be omitted.

  By the way, 1st Embodiment surrounds the some anchor bolt 21 and the some anchor bolt 21 which are arranged corresponding to the some hole 13 (FIG. 2) provided in the outer edge part of the column base 10, and are extended in an up-down direction from the outer side. 1 and a plurality of main bars 23 (FIG. 1) extending in the vertical direction, and a plurality of hoop bars 24 arranged at intervals in the vertical direction and surrounding the plurality of main bars 23 from the outside. In the column type 20 made of reinforced concrete supported from below, the column type 20 is inside the column type 20 and is higher than or higher than the plurality of main bars 23 and overlaps with the hoop bars 24h arranged at the highest position. An outer portion 25f embedded in the column mold 20 so as to be in position and engaging the anchor bolt 21, and an inner portion extending from the outer portion 25f toward the inside of the column mold 20 Reinforcement 25 and a 5c and further comprising (Fig. 4).

  According to the first embodiment, even if the column base 10 rolls during an earthquake or the like, and the shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bars 25 are Responsible for shearing force. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a second embodiment of the present invention will be described. FIG. 5 is a diagram schematically showing a column shape according to the second embodiment of the present invention. In order to facilitate understanding, the reinforcing bar in the concrete is viewed from above and represented by a perspective method. In the drawing, the base plate, the nut, and the upper ends of several anchor bolts are omitted. FIG. 6 is a view showing an exposed column base and a column shape according to the second embodiment of the present invention, and schematically shows a state viewed from the side by perspective. About 2nd Embodiment, about the structure which is common in embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted, and a different structure is demonstrated below. The column mold 20 of the second embodiment is larger than the column mold 20 of the first embodiment described above, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and eight. The U-shaped reinforcing bar 25 is provided.

  The anchor bolt 21 is disposed between each corner of the base plate 12 and between the adjacent corners. Also in the embodiment shown in FIG. 5, the main bars 23 are arranged outside the anchor bolts 21 as in the embodiment shown in FIG. 4 described above. In the embodiment shown in FIG. 5, the main bars 23 are arranged at each corner of the column mold 20, and a plurality of main bars 23 are arranged in the middle between adjacent corners. That is, the anchor bolts 21 are arranged in the vertical direction and the horizontal direction in plan view, and form a square arrangement.

  The anchor bolt 21 is provided on the anchor bolt 21 at each corner and the anchor bolt 21 disposed in the middle between adjacent corners. The reinforcing bars 25 provided on the anchor bolts 21 at the corners extend diagonally with respect to the square arrangement of the anchor bolts 21. The reinforcing bars 25 provided on the anchor bolts 21 in the middle between adjacent corners extend in the vertical direction and the horizontal direction with respect to the square arrangement of the anchor bolts 21.

  As shown in FIG. 6, all the hoop muscles 24 are arranged below the upper end portion of the U shape of the main muscle 23. That is, the uppermost hoop line 24 h does not cover the arc-shaped portion at the upper end of the main line 23. The reinforcing bar 25 is arranged at a position higher than the uppermost hoop bar 24h.

  According to the second embodiment, even if the column base 10 rolls during an earthquake or the like, and the shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bar 25 shears. Take charge of power. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a diagram schematically showing a column shape according to the third embodiment of the present invention. In order to facilitate understanding, the reinforcement inside the concrete is shown by a perspective method when viewed from above. In the drawing, a part of the base plate and a part of the anchor bolt are omitted from the upper end. In the third embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. The column mold 20 of the third embodiment has substantially the same dimensions as the column mold 20 of the above-described second embodiment, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and four. A U-shaped reinforcing bar 25 and two U-shaped reinforcing bars 28 at both ends are provided.

  Each reinforcing bar 25 is arranged on an anchor bolt 21 at each corner and extends along a diagonal with respect to the square arrangement of anchor bolts 21. Each reinforcing bar 28 is disposed on an anchor bolt 21 in the middle between adjacent corners, and extends in the vertical direction and the horizontal direction with respect to the square arrangement of the anchor bolts 21. The reinforcing bars 25 and 28 are arranged at a position higher than or overlapping with the uppermost hoop line 24h.

  Each reinforcing bar 28 is formed by bending both end regions of a linear reinforcing bar into a U-shape, and engages with two anchor bolts 21 at both end regions, and the intermediate region extends linearly. In other words, the reinforcing bar on one side included in the U shape that engages with one anchor bolt 21 and the reinforcing bar on the one side included in the U shape that engages with another anchor bolt 21 are integrally coupled to each other. .

  According to the third embodiment, even if the column base 10 rolls during an earthquake or the like and a shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bars 25 and 28. Is responsible for the shearing force. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a fourth embodiment of the present invention will be described. FIG. 8 is a diagram schematically showing a column shape according to the fourth embodiment of the present invention. In order to facilitate understanding, the reinforcement in the concrete is viewed from above and represented by a perspective method. In the drawing, a part of the base plate and the upper ends of some anchor bolts are omitted. In the fourth embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. The column mold 20 of the fourth embodiment has substantially the same dimensions as the column mold 20 of the second embodiment described above, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and four. A U-shaped reinforcing bar 25 and a reinforcing bar 29 are provided.

  Each reinforcing bar 25 engages with an anchor bolt 21 at each corner and extends along a diagonal with respect to the square array of anchor bolts 21. On the other hand, the reinforcing bars 29 do not engage with the anchor bolts 21 at each corner, but engage with the anchor bolts 21 located between the adjacent corners, and in an oblique direction with respect to the square arrangement of the anchor bolts 21. Extend. The reinforcing bars 25 and 29 are arranged at a position higher than or overlapping with the uppermost hoop bars 24h.

  The reinforcing bars 29 are formed in a U shape by bending both ends of the linear reinforcing bars, and engage with the two anchor bolts 21 at the bent portions on both ends. In other words, the first L-shaped reinforcing bar composed of two arms engages with the first anchor bolt 21, the second L-shaped reinforcing bar engages with the second anchor bolt 21, and the first One arm included in the L-shaped reinforcing bar and one arm included in the second L-shaped reinforcing bar are integrally coupled to each other.

  The reinforcing bars 29 are preferably arranged by connecting four U-shaped reinforcing bars in a diamond shape. The reinforcing bars 29 are engaged with the anchor bolts 21 arranged in the middle between adjacent corners and extend in an oblique direction with respect to the plurality of anchor bolts 21 arranged in a rectangular shape composed of a vertical side and a horizontal side. . Alternatively, the reinforcing bar 29 may be a diamond-shaped reinforcing bar in which linear reinforcing bars are bent at four locations and both end portions are overlapped.

  According to the fourth embodiment, even if the column base 10 rolls during an earthquake or the like, and the shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bars 25 and 29. Is responsible for the shearing force. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a fifth embodiment of the present invention will be described. FIG. 9 is a diagram schematically showing a column shape according to the fifth embodiment of the present invention. In order to facilitate understanding, the reinforcement inside the concrete is shown by a perspective method when viewed from above. In the fifth embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. The column mold 20 according to the fifth embodiment has substantially the same dimensions as the column mold 20 according to the second embodiment described above, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and four. A reinforcing bar 30 for the book.

  The reinforcing bar 30 is formed by bending the center of a linear reinforcing bar and further bending both ends inward. The central portion of each reinforcing bar 30 engages with the anchor bolt 21 at each corner. Both ends of the reinforcing bar 30 engage with the anchor bolts 21 adjacent to the anchor bolts 21 at the corners, respectively. That is, the reinforcing bars 30 are arranged at each corner with respect to the square arrangement of the anchor bolts 21, and one reinforcing bar is engaged with the three anchor bolts. The reinforcing bar 30 is disposed at a position higher than or overlapping with the uppermost hoop line 24h.

  Regarding two reinforcing bars 30 arranged adjacent to each other, one end of one reinforcing bar 30 and the other end of the other reinforcing bar 30 are arranged to overlap each other. In other words, the anchor bolt 21 disposed in the middle between adjacent corners engages with the two reinforcing bars 30 and 30.

  According to the fifth embodiment, even if the column base 10 rolls during an earthquake or the like, and the shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bar 30 shears. Take charge of power. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a sixth embodiment of the present invention will be described. FIG. 10 is a diagram schematically showing a column shape according to a sixth embodiment of the present invention. In order to facilitate understanding, the reinforcing bar inside the concrete is viewed from above and is represented by a perspective method. Regarding the sixth embodiment, the same components as those described in the above embodiments are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described below. The column mold 20 of the sixth embodiment has substantially the same dimensions as the column mold 20 of the second embodiment described above, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and a closure. And a reinforcing bar 32 of the mold.

  The reinforcing bars 32 are arranged in a square shape corresponding to the square arrangement of the anchor bolts 21 composed of the vertical sides and the horizontal sides. The reinforcing bar 32 is a closed type reinforcing bar in which a linear reinforcing bar is bent at four locations and both end portions are overlapped. Since the reinforcing bars 32 extend along the side surface 20 f of the column mold 20, the reinforcing bars 32 are not divided into the inner part and the outer part of the column base 20 in a plan view, but the reinforcing bars 32 surround all the anchor bolts 21. Each corner of the reinforcing bar 32 engages with the anchor bolt 21 at each corner.

  Alternatively, the reinforcing bars 32 may be arranged such that four U-shaped reinforcing bars are connected in a square shape. Both ends of each reinforcing bar 32 are engaged with anchor bolts 21 according to two adjacent corners. The central part of each reinforcing bar 32 is arranged outside the anchor bolt 21 arranged in the middle between adjacent corners. That is, the reinforcing bars 32 are arranged on each side with respect to the square arrangement of the anchor bolts 21. The reinforcing bar 32 is disposed at a position higher than or overlapping with the uppermost hoop line 24h.

  According to the sixth embodiment, the height position overlaps with the hoop muscle 24h that is located on the inner side of the plurality of main bars 23 and on the outer side of the plurality of anchor bolts 21 and arranged at the highest position, or higher. The reinforcing bars 32 are embedded in the column mold 20 so as to be positioned and extend along the side surface 20 f of the column mold 20. According to the column type 20 including the reinforcing bars 32 that surround all the anchor bolts 21 so as to close, the column base 10 rolls during an earthquake or the like, and the shearing force from the inside to the outside of the column type 20 causes the anchor bolts 21 to shear. Even if it acts on the upper end of the reinforcing bar 32, the reinforcing bar 32 is responsible for the shearing force. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, a seventh embodiment of the present invention will be described. FIG. 11 is a diagram schematically showing a column shape according to a seventh embodiment of the present invention. In order to facilitate understanding, the bar arrangement in the concrete is represented by a perspective method when viewed from above. Regarding the seventh embodiment, the same components as those described above are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described below. The column mold 20 of the seventh embodiment has substantially the same dimensions as the column mold 20 of the above-described second embodiment, and includes eight anchor bolts 21, twelve main bars 23, a plurality of hoop bars 24, and reinforcement. A muscle 29 and a closed reinforcing bar 32 are provided.

  According to the seventh embodiment, even if the column base 10 rolls during an earthquake or the like and a shearing force from the inside to the outside of the column mold 20 acts on the upper end portion of the anchor bolt 21, the reinforcing bars 29 and 32. Is responsible for the shearing force. Therefore, there is no fear that the side surface 20f of the column mold 20 is broken in a cone shape toward the outside, and the side breakdown of the column mold 20 can be prevented.

  Next, an eighth embodiment of the present invention will be described. FIG. 12 is a diagram schematically showing a columnar shape according to the eighth embodiment of the present invention, and the reinforcement inside the concrete is expressed by a perspective method when viewed from the side in order to facilitate understanding. In the eighth embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. The upper end portion of the main bar 23 of the eighth embodiment is not formed in the inverted U shape described above, but extends linearly in the vertical direction. A fixing metal 23 m is attached and fixed to the upper end portion of the main bar 23. The uppermost hoop line 24h is arranged adjacent to the lower side of the fixing hardware 23m. The height position of the reinforcing bar 25 overlaps with the height position of the hoop line 24h. Alternatively, although not shown, the reinforcing bar 25 is disposed at a position higher than the height position of the hoop line 24h.

  The height difference from the upper surface of the column mold 20 of the present embodiment to the neck lower part of the fixing metal 23m is defined as Ld. For comparison, as shown in FIG. 13, the distance Lc is defined as the distance Lc from the upper surface of the columnar mold 100 of the conventional example to the uppermost height position of the straight line portion of the rising stripe 101. Then, the relationship Lc> Ld is established. In this embodiment, the hoop muscle 24h can be arranged at a position higher than the hoop muscle 102h of the other embodiments.

  According to the eighth embodiment, since the upper end portion of the main bar 23 is a straight line instead of being formed in an inverted U shape and the fixing hardware 23m is provided, the height position of the uppermost hoop bar 24h is fixed. The hoop line 24h can be brought close to the upper surface of the column 20 by bringing it close to the height position of the hardware 23m. Therefore, the hoop muscle 24h is arranged at the cone-shaped fracture portion C shown in FIG. 13, and the strength of the column mold 20 against the shearing force of the anchor bolt 21 can be further increased.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The column type of the column base according to the present invention is advantageously used in a steel structure building.

10 column base, 11 column material, 12 base plate,
13 holes, 20 pillars, 20c concrete,
20f side, 21 anchor bolt, 22 mortar,
23 main bars, 23m anchor hardware, 24,24h hoop bars,
25 reinforcing bars, 25c inner part, 25f outer part,
27 Nuts, 28, 29, 30, 32 Reinforcing bars.

Claims (9)

A plurality of anchor bolts arranged to correspond to holes provided in the outer edge of the column base and extending in the vertical direction, a plurality of main bars arranged to surround the plurality of anchor bolts from the outside and extending in the vertical direction, and the vertical direction In a column type made of reinforced concrete that is provided with a plurality of hoop bars that are further disposed from the outside, and that supports the column base from below.
An outer portion that is embedded in the column shape and engages with the anchor bolt so as to be at a height position that overlaps with the hoop muscle arranged at the highest position or at a position higher than the plurality of main bars. And a column base of the column base, further comprising a reinforcing bar having an inner portion extending from the outer portion toward the inside of the column shape.   The reinforcing bar is a bar material including a central part that is bent and both ends extending opposite to each other, and engages the anchor bolt at the central part, and the both end parts are more columnar than the central part. The column type of the column base according to claim 1, which is embedded so as to be inside. The reinforcing bar is a bar including a central region and both end regions of a bent shape,
One of the both end regions engages with one anchor bolt,
The column type of the column base according to claim 1, wherein the other of the both end regions engages with the other anchor bolt.   The reinforcement bars are engaged with the anchor bolts arranged at corners and extend in a diagonal direction with respect to the plurality of anchor bolts arranged in a square shape including a longitudinal side and a lateral side. The column type of the column base in any one of 3.   The reinforcing bars are engaged with the anchor bolts arranged in the middle between adjacent corners with respect to the plurality of anchor bolts arranged in a rectangular shape composed of a vertical side and a horizontal side. Or the pillar type | mold of the column base in any one of Claims 1-3 extended in a horizontal direction.   The reinforcing bars are engaged with the anchor bolts arranged in the middle of adjacent corners and extend in an oblique direction with respect to the plurality of anchor bolts arranged in a square shape including a vertical side and a horizontal side. The column type of the column base according to claim 3.   2. The columnar column shape according to claim 1, wherein the outer portion of the reinforcing bar extends along a side surface of the column base and engages with at least two anchor bolts arranged side by side. A plurality of anchor bolts arranged to correspond to the bolt holes provided in the outer edge portion of the column base and extending in the vertical direction, a plurality of main bars arranged to surround the plurality of anchor bolts from the outside and extending in the vertical direction, and the top and bottom In a column type made of reinforced concrete that is provided with a plurality of hoop bars that are arranged at intervals in the direction and surround the plurality of main bars from the outside, and that supports the column base from below,
The anchor bolts are embedded on the outer side of the plurality of main bars and embedded in the column shape so as to be at a height position that overlaps with the hoop bars arranged at the highest position or at a higher position. A column base of a column base, further comprising a closed reinforcing bar surrounding the column base. A fixing hardware is provided at the upper end of the main bar,
The pillar type of the column base according to any one of claims 1 to 8, wherein the hoop line is disposed adjacent to a lower side of the fixing hardware.

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