JP2012107485A - Steel column anchor device, steel column support structure, and construction method of steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel column anchor device having high drawing resistance, with reduced construction period.SOLUTION: A steel column anchor device comprises a base plate 5 disposed at a lower end of a steel column 3, an approximately U-shaped anchor bolt 6 having screw parts 6a and 6a at both ends which are fixed to fixing holes 5a and 5a provided in the base plate 5 with nuts 7 and 7, and an anchor plate 8 to which the bottom of the approximately U-shaped anchor bolt 6 is fixed nearly in parallel with the base plate 5.

Description

  The present invention relates to an anchor device for a steel column for fixing a lower end portion of a steel column to a concrete foundation, a steel column support structure using the steel column anchor device, and a steel structure having the steel column support structure Is related to the construction method.

  Conventionally, various anchoring devices for steel columns for fixing the lower end of a steel column to a concrete foundation have been proposed and put into practice.

  For example, the conventional steel column anchor device disclosed in Patent Document 1 is configured such that a large pull-out resistance can be obtained by using a substantially U-shaped anchor bolt.

Japanese Patent No. 3729899

  However, in the conventional steel column anchor device such as Patent Document 1 described above, further construction work cannot be performed until the concrete around the anchor bolt at the lower end of the steel column is solidified.

  Therefore, for example, even in a unit building where the construction period can be shortened, there is a problem that the construction period such as the steel frame staircase cannot be shortened when a steel frame staircase is installed around the unit building.

  Accordingly, the present invention provides a steel column anchor device capable of obtaining a large pulling resistance and shortening the work period, a steel column support structure using the steel column anchor device, and a steel frame including the steel column support structure It aims at providing the construction method of a structure.

  In order to achieve the above object, an anchor device for a steel column according to the present invention includes a base plate provided at a lower end portion of a steel column, and fixing portions provided in the base plate, and screw portions formed at both ends by nuts. A substantially U-shaped anchor bolt to be fixed, and an anchor plate to which a bottom portion of the substantially U-shaped anchor bolt is fixed substantially parallel to the base plate.

  Here, the anchor plate is provided with an anchor insertion hole, and an anchor protruding from the upper surface of the concrete foundation is inserted, and the anchor is fixed by a fixing member, so that the anchor can be fixed to the concrete foundation. It is good to be.

  A plurality of the substantially U-shaped anchor bolts may be used.

  Further, the bottom portion of the substantially U-shaped anchor bolt may be provided with a fracture portion or a notch portion, and may be fixed to the anchor plate.

  Further, the base plate is provided with a bolt fixing hole, and a bolt for buckling prevention is screwed into the bolt fixing hole from below so as to be able to support between the base plate and the anchor plate. May be.

  The steel column support structure of the present invention is characterized in that the above-described anchor device for a steel column is installed on a concrete foundation, and at least the height of the base plate is cast with concrete wound.

  Here, it is preferable that at least two of the steel columns are connected in advance by a beam.

  In the method for constructing a steel structure according to the present invention, the steel column provided with the steel column anchor device described above is placed on a concrete foundation, and the upper structure is assembled. It is characterized in that a steel structure is constructed by laying the root winding concrete up to the height of the base plate.

  Such an anchor device for a steel column according to the present invention includes a base plate provided at the lower end portion of the steel column, and a substantially U-shape in which screw portions formed at both ends are fixed to nuts by fixing holes provided in the base plate. And an anchor plate to which the bottom of the substantially U-shaped anchor bolt is fixed substantially parallel to the base plate.

  With such a configuration, the lower end portion of the steel column is temporarily supported by the anchor plate, so that an upper structure of the steel column such as a steel frame stairs can be constructed in advance, and the construction period can be shortened.

  In addition, after concrete is placed around the substantially U-shaped anchor bolt, not only the substantially U-shaped anchor bolt but also the anchor plate resists the pulling force, so that a large pulling resistance is obtained.

  Here, an anchor insertion hole is provided in the anchor plate, and the anchor can be fixed to the concrete foundation by inserting the anchor protruding from the upper surface of the concrete foundation and fixing the anchor with a fixing member. In this case, when constructing the upper structure of the steel column in advance, the lower end of the steel column can be temporarily provisionally supported, the workability can be improved, and the anchor plate is fixed to the concrete foundation. A larger pulling resistance can be obtained.

  Further, when a plurality of substantially U-shaped anchor bolts are used, when the upper structure of the steel column is constructed in advance, the substantially U-shaped anchor is used even when the weight of the upper structure is large. The bolt portion can be prevented from buckling, and, in addition, an even greater drawing resistance can be obtained by the increase in the number of substantially U-shaped anchor bolts.

  Further, when the bottom of the substantially U-shaped anchor bolt is provided with a rupture portion or a notch and is fixed to the anchor plate, the bottom of the substantially U-shaped anchor bolt is fixed to the anchor plate by welding. Can reduce the adverse effects of welding distortion due to the presence of the fractured part or the notch part, and can improve the overall accuracy.

  Furthermore, the base plate is provided with a bolt fixing hole, and a bolt for preventing buckling is screwed into the bolt fixing hole from below, so that it can be supported between the base plate and the anchor plate. When constructing the upper structure of a steel column in advance, even when the weight of the upper structure is larger, not only the U-shaped anchor bolt but also the buckling prevention between the base plate and the anchor plate Since it is also supported by the bolt for use, the substantially U-shaped anchor bolt portion does not need to buckle.

  Such a steel column support structure of the present invention has a structure in which the above-described anchor device for a steel column is installed on a concrete foundation, and the root concrete is cast at least up to the height position of the base plate.

  Because of this structure, if the steel column anchor device described above is installed on a concrete foundation that has been previously placed and the root concrete is driven at least up to the height of the base plate, the effect of the steel column anchor device described above is achieved. It is possible to easily construct a steel column support structure that achieves the above.

  Here, when at least two steel columns are connected in advance by a beam, the step of connecting the steel columns at the site by the beam can be omitted, and therefore the construction period can be further shortened.

  Such a method for constructing a steel structure according to the present invention is a method for mounting a steel column provided with the above-described anchor device for a steel column on a concrete foundation, assembling an upper structure, and The structure is such that a steel structure is constructed by placing concrete at least to the height of the base plate.

  With such a configuration, a steel structure can be constructed with high accuracy and with a reduced construction period.

It is a front view which shows schematic structure of the steel column support structure of Example 1. FIG. 1 is a front view showing a schematic configuration of an upper part of a steel column in Example 1. FIG. It is a front view which shows schematic structure of the anchor apparatus for steel frames of Example 1. FIG. FIG. 4 is a side view of FIG. 3. It is an AA arrow directional cross-sectional view in FIG. In the construction method of the steel structure of Example 1, it is description which shows the state which assembled the steel structure stairs as an upper structure. It is a front view which shows schematic structure of the anchor apparatus for steel columns of Example 2. FIG. FIG. 8 is a side view of FIG. 7. FIG. 8 is a cross-sectional view taken along line B-B in FIG. 7. It is a front view which shows schematic structure of the anchor apparatus for steel columns of Example 3. FIG. It is a side view of FIG. It is CC sectional view taken on the line in FIG. It is a front view which shows schematic structure of the anchor apparatus for steel columns of Example 4. FIG. FIG. 14 is a side view of FIG. 13. It is DD sectional view taken on the line in FIG. It is a front view which shows schematic structure of the anchor apparatus for steel columns of Example 5. FIG. FIG. 17 is a side view of FIG. 16. It is the EE arrow directional cross-sectional view in FIG. It is a front view which shows schematic structure of the anchor apparatus for steel columns of Example 6. FIG. FIG. 20 is a side view of FIG. 19. FIG. 20 is a cross-sectional view taken along line FF in FIG. 19.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on Examples 1-6 shown on drawing.

  First, the configuration of the first embodiment will be described.

  FIG. 1 shows a schematic configuration of the steel column support structure of the first embodiment.

  In the steel column support structure according to the first embodiment, a root concrete 2 is placed on a concrete foundation 1 placed on the ground, and a lower end portion of the steel pillar 3 is supported in the root concrete 2. ing.

  Next, while explaining the construction method of the steel structure of Example 1, the details will be described.

  First, as shown in FIGS. 2 and 3, reinforcing bars 10 are arranged in the concrete foundation 1 placed on the ground.

  Then, two holes are drilled substantially vertically from the upper surface of the concrete foundation 1 with a drill or the like, and two anchors 4 and 4 having threaded portions 4a on the upper side are projected in these holes by post-construction. .

  Here, as shown in FIG. 2, the upper ends of the steel columns 3 and 3 are connected in advance by a beam 11 and have a substantially gate shape.

  Further, the lower end portion of the steel column 3 includes the steel column anchor device of the first embodiment.

  That is, the steel column anchor device according to the first embodiment is mainly composed of the base plate 5, the substantially U-shaped anchor bolt 6, and the anchor plate 8 as shown in FIGS. 3 and 4. .

  Here, the base plate 5 has a rectangular flat plate shape and is fixed to the lower end portion of the steel column 3 by welding.

  In addition, the substantially U-shaped anchor bolt 6 has two fixing holes 5a and 5a provided in the base plate 5 and screw portions 6a and 6a formed at both ends by nuts 7 and 7 via washers 7a, respectively. It is fixed.

  The installation height position of the steel column 3 can be finely adjusted by the fixing positions of the screw portions 6a and 6a with the nuts 7 and 7.

  Furthermore, the anchor plate 8 has a rectangular flat plate shape, and is fixed to the bottom of the substantially U-shaped anchor bolt 6 by welding so as to be substantially parallel to the base plate 5.

  Here, the anchor plate 8 is provided with two anchor insertion holes 8a, 8a having a slightly larger diameter than the anchor 4 projecting from the concrete foundation 1 in the post-construction.

  And through these anchor insertion holes 8a, 8a, threaded portions 4a, 4a of the anchors 4, 4 projecting from the concrete foundation 1 are inserted, and the steel column 3 is placed on the upper surface of the concrete foundation 1. .

  Then, when the nuts 9 and 9 as the fixing members are fixed to the threaded portions 4a and 4a of the anchors 4 and 4 through the washers 9a, the steel column 3 is temporarily supported by the anchor plate 8 portion ( (See also FIG. 5).

  In this state, as shown in FIG. 6, a steel-structured staircase K as an upper structure is assembled ahead of the unit building U that has already been constructed.

  The anchor insertion holes 8a, 8a provided in the anchor plate 8 are slightly larger in diameter than the anchor 4, so that it is necessary to correct the horizontal position when assembling the steel stairs K. It is possible to respond to any occasion.

  Thus, when the root-wrapped concrete 2 is placed up to the position indicated by the two-dot chain line in FIGS. 3 and 4 above the base plate 5, the entire steel-structured staircase K as a steel-frame structure is constructed.

  Next, the effect of Example 1 is demonstrated.

  Such a steel column anchor device according to the first embodiment includes a base plate 5 provided at the lower end of the steel column 3, and screw portions 6a formed at both ends of the fixing holes 5a and 5a provided in the base plate 5. 6a is configured to include a substantially U-shaped anchor bolt 6 fixed by nuts 7 and 7 and an anchor plate 8 to which the bottom of the substantially U-shaped anchor bolt 6 is fixed substantially parallel to the base plate 5. ing.

  Since it is such a structure, since the lower end part of the steel column 3 is temporarily supported by the anchor plate 8, the upper structure of the steel column 3 such as a steel stairs can be constructed in advance, and the construction period can be shortened. .

  In addition, after the root winding concrete 2 is placed around the substantially U-shaped anchor bolt 6, not only the substantially U-shaped anchor bolt 6 but also the anchor plate 8 resists the pulling force. Drawing resistance is obtained.

  Furthermore, since the root winding concrete 2 is driven up to the upper side of the base plate 5, the base plate 5 also resists the pulling force, so that a larger pulling resistance is obtained.

  Here, the anchor plate 8 is provided with anchor insertion holes 8a, 8a, through which the anchors 4, 4 protruding from the upper surface of the concrete foundation 1 are inserted, and the anchors 4, 4 are nuts 9 as fixing members. , 9 can be fixed to the concrete foundation 1.

  For this reason, when an upper structure such as a steel-structured staircase supported by the steel column 3 is constructed in advance, the lower end portion of the steel column 3 can be temporarily temporarily supported, and workability can be improved. Since the anchor plate 8 is fixed to the concrete foundation 1, an even greater drawing resistance can be obtained.

  Screw portions 6a and 6a are formed at both ends of the substantially U-shaped anchor bolt 6.

  For this reason, fine adjustment of the installation height position of the steel column 3 is possible by the fixing position by the nuts 7 and 7 in the screw parts 6a and 6a.

  Further, the anchor insertion holes 8 a and 8 a provided in the anchor plate 8 are slightly larger in diameter than the anchor 4.

  For this reason, when an upper structure such as a steel-framed staircase supported by the steel column 3 is constructed in advance, it is possible to cope with the need for horizontal position correction.

  In such a steel column support structure of Example 1, the steel column anchor device of Example 1 described above is installed on the concrete foundation 1, and the root wound concrete 2 is placed to a height position above the base plate 5. It is set as the structure.

  Since it is such a structure, the steel column support structure which has the effect of the anchor apparatus for steel columns of Example 1 mentioned above can be constructed | assembled easily.

  Here, the upper ends of the two steel columns 3 and 3 are connected in advance by the beam 11.

  For this reason, since the process of connecting the steel columns 3 and 3 at the site with the beam 11 can be omitted, the construction period can be further shortened.

  In the construction method of the steel structure of Example 1 as described above, the steel column 3 provided with the above-described anchor device for a steel column is placed on the upper surface of the concrete foundation 1, and a steel-structured staircase K as an upper structure is provided. After assembling the steel structure, it is configured to construct the entire steel-structured staircase K as a steel-framed structure by placing the root winding concrete 2 up to a height above the base plate 5 of the steel column anchor device. Yes.

  With such a configuration, the entire steel structure stairs K as a steel structure can be constructed with high accuracy and with a shortened construction period.

  Next, Example 2 will be described.

  In addition, the description which attaches | subjects the same code | symbol about the description of the same thru | or equivalent part as the content demonstrated in Example 1, and demonstrates.

  7-9 has shown schematic structure of the anchor apparatus for steel columns of Example 2. FIG.

  The steel column anchor device according to the second embodiment is mainly different from the steel column anchor device according to the first embodiment described above in that two substantially U-shaped anchor bolts 6 are used.

  For this reason, when the steel-structured staircase K as an upper structure supported by the steel column 3 is constructed in advance, the number of floors is large. The portions of the letter-shaped anchor bolts 6 and 6 do not need to buckle. In addition, since the number of the substantially U-shaped anchor bolts 6 is increased, an even greater pull-out resistance is obtained.

  7 and FIG. 8 above the base plate 5 is driven to the position indicated by the two-dot chain line, the appearance is the same as the steel column support structure of Example 1 shown in FIG. The steel column support structure of Example 2 is obtained.

  Other configurations and functions and effects are substantially the same as those in the first embodiment, and thus description thereof is omitted.

  Next, Example 3 will be described.

  In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in Example 1,2.

  10-12 has shown schematic structure of the anchor apparatus for steel columns of Example 3. FIG.

  In the steel column anchor device of the third embodiment, a bolt fixing hole 12 is provided in the approximate center of the base plate 5, and a nut 13 is fixed to the upper portion of the bolt fixing hole 12 by welding. .

  Then, the bolt 14 for buckling prevention is screwed into the bolt fixing hole 12 from below so that the space between the base plate 5 and the anchor plate 8 can be supported. Mainly different from the anchor device.

  For this reason, when the steel structure stairs K as the upper structure supported by the steel column 3 are constructed in advance, the weight of the steel structure stairs K is further increased due to a large number of floors and heavy members used. Even when it is large, the space between the base plate 5 and the anchor plate 8 is supported not only by the substantially U-shaped anchor bolts 6, 6 but also by the buckling prevention bolts 14. The part 6 is not buckled.

  Here, when the root concrete 2 is placed up to the position shown by the two-dot chain line in FIGS. 10 and 11 above the base plate 5, the steel column support structure and the external appearance of the first and second embodiments shown in FIG. The steel column support structure of the same Example 3 is obtained.

  Other configurations and functions and effects are substantially the same as those of the first and second embodiments, and thus description thereof is omitted.

  Next, Example 4 will be described.

  In addition, the description which attaches | subjects the same code | symbol about the description of the same thru | or equivalent part as the content demonstrated in Example 1, and demonstrates.

  FIGS. 13-15 has shown schematic structure of the anchor apparatus for steel columns of Example 4. FIG.

  In the anchor device for a steel column of the fourth embodiment, the fracture portion 15 having a slight gap is provided at the bottom of the substantially U-shaped anchor bolt 6 so that the anchor device for the steel column of the first embodiment described above. And mainly different.

  Here, the part of the fracture | rupture part 15 is not welded.

  For this reason, the presence of the fracture portion 15 can reduce the adverse effects of welding distortion and improve the overall accuracy.

  Moreover, since the substantially U-shaped anchor bolt 6 should just use a pair of substantially J-shaped anchor bolts, it can process easily and can be implemented cheaply.

  Here, when the root winding concrete 2 is placed up to the position indicated by the two-dot chain line in FIGS. 13 and 14 above the base plate 5, the appearance is the same as that of the steel column support structure of the first embodiment shown in FIG. The steel column support structure of Example 4 is obtained.

  Other configurations and functions and effects are substantially the same as those in the first embodiment, and thus description thereof is omitted.

  Next, Example 5 will be described.

  In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in Example 1,2.

  FIGS. 16-18 has shown schematic structure of the anchor apparatus for steel columns of Example 5. FIG.

  In the anchor device for a steel column of the fifth embodiment, the fracture portion 15 having a slight gap is provided at the bottom of the substantially U-shaped anchor bolt 6. And mainly different.

  Here, the part of the fracture | rupture part 15 is not welded.

  For this reason, the presence of the fracture portion 15 can reduce the adverse effects of welding distortion and improve the overall accuracy.

  Moreover, since the substantially U-shaped anchor bolt 6 should just use a pair of substantially J-shaped anchor bolts, it can process easily and can be implemented cheaply.

  Here, when the root winding concrete 2 is placed up to the position indicated by a two-dot chain line in FIGS. 16 and 17 above the base plate 5, the appearance is the same as that of the steel column support structure of the first embodiment shown in FIG. The steel column support structure of Example 5 is obtained.

  Other configurations and functions and effects are substantially the same as those in the second embodiment, and thus description thereof is omitted.

  Next, Example 6 will be described.

  In addition, the description which attaches | subjects the same code | symbol about the description of the part same or equivalent to the content demonstrated in Example 1, 3. FIG.

  FIGS. 19-21 has shown schematic structure of the anchor apparatus for steel columns of Example 6. FIG.

  In the anchor device for a steel column of the sixth embodiment, the fracture portion 15 having a slight gap is provided at the bottom of the substantially U-shaped anchor bolt 6. And mainly different.

  Here, the part of the fracture | rupture part 15 is not welded.

  For this reason, the presence of the fracture portion 15 can reduce the adverse effects of welding distortion and improve the overall accuracy.

  Moreover, since the substantially U-shaped anchor bolt 6 should just use a pair of substantially J-shaped anchor bolts, it can process easily and can be implemented cheaply.

  Here, when the root winding concrete 2 is placed up to the position indicated by the two-dot chain line in FIGS. 19 and 20 above the base plate 5, the appearance is the same as the steel column support structure of the first embodiment shown in FIG. The steel column support structure of Example 6 is obtained.

  Other configurations and functions and effects are substantially the same as those of the third embodiment, and thus description thereof is omitted.

  As mentioned above, although the form for implementing this invention has been explained in full detail based on Examples 1-6 with reference to drawings, the concrete structure is not limited to these Examples 1-6, Design changes that do not depart from the gist are included in the present invention.

  For example, in Examples 1 to 6 described above, the root wound concrete 2 was placed up to a position above the base plate 5. However, the present invention is not limited thereto, and the root wound concrete 2 is placed up to the height position of the base plate 5. May be implemented.

  Moreover, in above-mentioned Examples 1-6, although the upper structure was implemented as the steel structure staircase K, it is not limited to this, For example, you may implement as a steel structure hallway, a balcony, or an entrance gate. .

  Furthermore, in above-mentioned Examples 3-6, although the fracture | rupture part 15 was provided in the bottom part of the substantially U-shaped anchor bolt 6, it was not limited to this, For example, instead of the fracture | rupture part 15, a notch part is provided. Even if it implements, the bad influence by welding distortion can be reduced and the whole precision improvement can be aimed at.

DESCRIPTION OF SYMBOLS 1 Concrete foundation 2 Necklace concrete 3 Steel column 4 Anchor 4a Anchor threading part 5 Base plate 5a Base plate fixing hole 6 U-shaped anchor bolt 6a U-shaped anchor bolt screw part 7 Nut 7a Washer 8 Anchor plate 8a Anchor plate anchor insertion hole 9 Nut (fixing member)
9a Washer 10 Reinforcing bar 11 Beam 12 Bolt fixing hole 13 Nut 14 Buckling prevention bolt 15 Broken part K Steel structure staircase (upper structure)
U unit building

Claims (8)

  A base plate provided at the lower end of the steel column, a substantially U-shaped anchor bolt in which a screw part formed at both ends is fixed to a fixing hole provided in the base plate by a nut, and substantially parallel to the base plate An anchor device for a steel column comprising an anchor plate to which a bottom portion of the substantially U-shaped anchor bolt is fixed.   An anchor insertion hole is provided in the anchor plate, and an anchor protruding from the upper surface of the concrete foundation is inserted, and the anchor can be fixed to the concrete foundation by fixing with a fixing member. The steel column anchor device according to claim 1.   The steel column anchor device according to claim 1 or 2, wherein a plurality of the substantially U-shaped anchor bolts are used.   The bottom part of the said substantially U-shaped anchor bolt is provided with the fracture | rupture part or the notch part, and is being fixed to the said anchor plate, The steel pillar column of any one of Claim 1 thru | or 3 characterized by the above-mentioned. Anchor device.   The base plate is provided with a bolt fixing hole, and a bolt for buckling prevention is screwed into the bolt fixing hole from below so that it can be supported between the base plate and the anchor plate. The anchor device for a steel column according to any one of claims 1 to 4, wherein:   The steel column anchor device according to any one of claims 1 to 5, wherein the steel column anchor device is installed on a concrete foundation, and at least the height of the base plate is cast with concrete wound. Support structure.   The steel column support structure according to claim 6, wherein at least two of the steel columns are connected in advance by a beam.   After mounting the steel column provided with the steel column anchor device according to any one of claims 1 to 5 on a concrete foundation and assembling an upper structure, at least the steel column anchor device is provided. A method for constructing a steel structure, characterized in that a steel structure is constructed by placing root winding concrete up to the height of a base plate.