JP4587041B2 - Steel pipe column and steel pipe column joining method - Google Patents

Description

  The present invention relates to a steel pipe column and a steel pipe column joining method, and more particularly to a steel pipe column and a steel pipe column joining method that can be easily and easily constructed in a steel structure building.

  Steel pipe columns of steel structure buildings are fixed to the lower and upper joints by erection pieces protruding from the upper part of the lower and upper part of the upper joint, and then the lower and upper joints are connected. It is common to build by welding each other. For this reason, the erection piece which became unnecessary after construction of the steel pipe column had to be melted by gas. Moreover, after depreciation of the steel structure building, the steel pipe column could not be disassembled unless it was cut with gas. Furthermore, since the steel pipe column after disassembly is cut by gas or the like, it is difficult to reuse the steel pipe column as it is.

  In order to solve such a problem, a joint plate is welded to the inner side of the lower joint column in advance, and the joint plate and the upper joint column are fastened with a high-strength bolt, so that the upper joint column and the lower joint column are A steel pipe column in which is joined is proposed (for example, see Patent Document 1).

JP 2004-285816 A

  However, the construction complexity such as having to weld the joining plate to the inner side of the lower joint column in advance is disliked, and it has not been put into practical use.

  The present invention has been made in view of the above, and in a construction site of a steel structure building, the lower and upper joints can be easily and easily performed without welding the lower joint and the upper joint. An object of the present invention is to provide a steel pipe column and a steel pipe column joining method that are firmly joined to the column.

  In order to solve the above-described problems and achieve the object, the present invention has an erection piece standing outside the extending direction, a lower column having a support bar on the outer periphery of the upper part, and an extending direction outside. The erection piece is erected, and the upper and lower columnar columns, which are provided with bearing bars on the outer periphery of the lower part, are separated from the outer peripheral surfaces of the lower and upper columnar columns. It is characterized by comprising a joint panel in which the lower section column erection piece and the upper section column erection piece are connected and a mortar filled between the lower section column and the upper section column and the joint panel. To do.

  Further, the present invention is characterized in that a support bar is provided at the inner upper end and the inner lower end of the joint panel.

  In addition, the present invention provides an erection piece standing outside the extending direction of the lower joint column provided with the supporting bar on the outer periphery of the upper part and an extending direction outside of the upper joint column provided with the supporting bar on the outer periphery of the lower part. The erection piece is separated from the outer peripheral surfaces of the lower and upper joint pillars by the joint panel and connected in a manner to cover the joint between the lower and upper joint pillars. It is characterized by filling mortar between the node column and the joint panel.

  In the steel pipe column according to the present invention, since the joint panel connects the erection piece of the lower node column and the erection piece of the upper node column, the lower node column and the upper node column are accurately positioned. Further, since the mortar is filled between the lower and upper joint columns and the joint panel, it is possible to provide a steel pipe column that joins the lower and upper joint columns without welding. In addition, by removing the joint panel, the lower joint column and the upper joint column can be easily disassembled, and the lower joint column, the upper joint column, and the joint panel can be reused.

  In addition, since the bearing bar is provided at the inner upper end and inner lower end of the joint panel, when an external force is applied in the direction in which the lower and upper joint columns are separated, the bearing bar and upper joint of the lower joint column are separated. A compressive force is generated in the mortar filled between the column bearing bar and the joint panel bearing bar. As a result, it is possible to provide a steel pipe column in which the lower node column and the upper node column are firmly joined without using welding.

  Further, the steel pipe column joining method according to the present invention is such that after the lower section column erection piece and the upper section column erection piece are connected by the joint panel, the mortar is placed between the lower section column and the upper section column and the joint panel. Therefore, it is not necessary to weld the lower and upper joint columns at the construction site of the steel structure building, and the lower and upper joint columns can be joined easily and easily.

  Embodiments of a steel pipe column and a steel pipe column joining method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  1 is a perspective view showing a steel pipe pillar according to an embodiment of the present invention, FIG. 2 is a perspective view showing an upper joint pillar and a lower joint pillar, FIG. 3 is a perspective view showing a joint panel, and FIG. 4 is FIG. It is a schematic diagram which shows the dynamic mechanism of the shown steel pipe column.

  The steel pipe pillar concerning the Example of this invention comprises a steel structure building, and has the lower joint pillar 1, the upper joint pillar 2, and the some joint panel 3, as shown in FIG.

  The lower node column 1 and the upper node column 2 are steel pipes having the same cross-sectional shape, and the lower node column 1 and the upper node column 2 illustrated in this embodiment are rectangular as shown in FIGS. 1 and 2. This is a square steel pipe having the following cross-sectional shape. In addition, erection pieces 11 and 21 are erected at positions at which the outer peripheries of the lower node column 1 and the upper node column 2 are equally divided. Specifically, as shown in FIG. 2, the erection is performed at a position where the outer peripheries of the lower and upper columnars 1 and 2 are equally divided, that is, at substantially the center of each side of the lower and upper columnars 1 and 2. Pieces 11 and 21 are erected. The erection pieces 11, 21 are for connecting the lower node column 1 and the upper node column 2 and are provided by welding rectangular plate-like pieces to the lower node column 1 and the upper node column 2. These erection pieces 11, 21 extend in the extending direction of the lower joint column 1 and the upper joint column 2, and through holes 11 a, 21 a for fastening the joint panel 3 are formed in these erection pieces 11, 21. is there. Furthermore, bearing bars 12 and 22 are provided on the upper outer periphery of the lower joint column 1 and the lower outer periphery of the upper joint column 2. The bearing bars 12, 12 are provided by welding reinforcing bars or the like to the lower node column 1 and the upper node column 2.

  As shown in FIG. 1, the erection piece 11 of the lower joint column 1 and the erection piece 21 of the upper joint column 2 are connected by a plurality of joint panels 3. The joint panel 3 is separated from the outer peripheral surfaces of the lower node column 1 and the upper node column 2 and covers the joint between the lower node column 1 and the upper node column 2, and the erection piece 11 of the lower node column 1 and the upper The erection piece 21 of the node pillar 2 is connected. In the steel pipe column exemplified in the present embodiment, four joint panels 3 are separated from the outer peripheral surfaces of the lower and upper joint columns 1 and 2 and cover the joint portion of the lower and upper joint columns 1 and 2. In an aspect, the erection piece 11 of the lower joint pillar 1 and the erection piece 21 of the upper joint pillar 2 are connected. Accordingly, one joint panel 3 covers the outer peripheries of the lower joint column 1 and the upper joint column 2 by a quarter.

  As shown in FIG. 3, each joint panel 3 is formed to have a substantially L-shaped cross section, and extends outward from the lower and upper columnars 1 and 2 on both sides thereof. A mounting portion 31 is formed. A through hole 31 a for fastening the erection pieces 11, 21 is provided in the attachment part 31, and after the erection pieces 11, 21 are sandwiched between the attachment parts 31 of the adjacent joint panels 3, the through holes of the attachment part 31 are provided. The erection pieces 11, 21 and the joint panel 3 are fastened by screwing nuts 5 into bolts 4 passing through the through holes 11 a, 21 a of the erection pieces 11, 21, and the through holes 31 a of the attachment portion 31. In addition, bearing bars 32 and 33 are provided at the inner upper end and the inner lower end of the joint panel 3. The support bars 32 and 33 are provided by welding reinforcing bars or the like to the joint panel 3.

  A mortar 6 is filled between the lower and upper pillars 1 and 2 and the joint panel 3. For this reason, as shown in FIG. 4, between the bearing bar 12 provided on the upper outer periphery of the lower joint column 1 and the bearing bar 33 provided on the inner lower end of the joint panel 3, on the lower outer periphery of the upper joint column 2. The filled mortar 6 is interposed between the provided bearing bar 22 and the bearing bar 32 provided at the inner upper end of the joint panel 3.

  The steel pipe column described above includes the erection piece 11 erected on the lower node column 1 and the erection piece 21 erected on the upper node column 2 after metal touching the lower node column 1 and the upper node column 2. The joint panel 3 is used for connection. Then, the joint panel 3 is separated from the outer peripheral surfaces of the lower node column 1 and the upper node column 2 and covers the joint portion between the lower node column 1 and the upper node column 2. Then, the steel pipe column is constructed by filling the mortar 6 between the lower and upper node columns 1 and 2 and the joint panel 3.

  As shown in FIG. 4, the steel pipe column constructed in this way is obtained when an external force is applied in a direction in which the lower node column 1 and the upper node column 2 are separated from each other. Therefore, a compressive force (resistance force) acts on the mortar 6 filled in between. More specifically, the bearing pressure provided between the bearing bar 12 provided on the upper outer periphery of the lower joint column 1 and the bearing bar 33 provided on the inner lower end of the joint panel 3 and the lower outer periphery of the upper joint column 2. A compressive force acts between the bar 22 and the support bar 32 provided at the upper end of the joint panel 3.

  On the other hand, when disassembling the steel pipe column constructed in this way, the disassembly of the steel pipe column is completed by removing the joint panel 3 and removing the exposed mortar 6. Since the lower joint column 1, the upper joint column 2 and the joint panel 3 thus disassembled are not damaged by fusing or the like, they can be reused (reused) as they are.

  In the steel pipe column according to the above-described embodiment, after the lower node column 1 and the upper node column 2 are metal-touched, the erection piece 11 erected on the lower node column 1 and the erection piece 21 erected on the upper node column 2. Are coupled by the joint panel 3, so that the lower node column 1 and the upper node column 2 can be positioned with high accuracy. After that, if the mortar 6 is filled between the lower joint column 1 and the upper joint column 2 and the joint panel 3, the steel pipe column is completed, so that it is not necessary to perform welding work at the construction site of the steel structure building. And it can be easily constructed. Moreover, if the joint panel 3 is removed from the steel pipe column and the exposed mortar 6 is removed, the steel pipe column can be disassembled, so that the dismantling property is also good. Furthermore, since the disassembled lower joint pillar 1, upper joint pillar 2 and joint panel 3 are not damaged, they can be reused as they are.

  In addition, although the lower joint pillar 1 and the upper joint pillar 2 concerning the Example mentioned above were comprised with the square steel pipe, they are not restricted to a square steel pipe, You may comprise with a circular steel pipe. Moreover, although the supporting bar 12, 22, 32, 33 of the lower joint pillar 1, the upper joint pillar 2, and the joint panel 3 was formed by welding a reinforcing bar, it is not restricted to a reinforcing bar, but a flat bar (flat It may be formed by welding or the like.

  Moreover, although the bearing bar 32,33 shall be provided in the internal upper end and internal lower end of the joint panel 3 of the steel pipe column concerning the Example mentioned above, the swallowing length La (refer FIG. 5) of a column is enough. In the case of being long, since the frictional force of the mortar 6 works effectively between the lower joint column 1 and the joint panel 3 and between the upper joint column 2 and the joint panel 3, the bearing bar 32, Even if 33 is not provided, it is possible to prevent the lower and upper pillars 1 and 2 from coming out.

  Here, taking the upper joint column 2 as an example, in order to consider the relationship between the shearing force of the upper joint column 2 and the swallowing length La of the upper joint column 2, the action state of the force at the moment when the upper joint column 2 is pulled out think of. FIG. 5 and FIG. 6 are diagrams showing the action state of the force in the joint portion at the moment when the upper node column comes off.

  Assuming that the shear force generated in the upper joint column 2 is Qs, the column rotates around the point A by the action of Qs, and the bearing bar 22 provided on the lower outer periphery of the upper joint column 2 pushes up the mortar, and the joint panel 3 A frictional force is generated between the mortar 6 and the mortar 6. At this time, the support pressure N of the joint panel 3 and the mortar 6 is assumed to be a triangular distributed load as shown in FIG. When the maximum support pressure per unit area is 2/3 cFm, the support pressure Fx generated at the position of the height x from the point A can be obtained by Equation 1.

  Further, as shown in FIG. 6, the effective cross section of the joint panel 3 that receives the supporting pressure is assumed to have a triangular distribution with a projected length Lp equal to the outer shape (width) of the column as a base. At this time, the length Lx of the portion that receives the supporting pressure at the position of the height x from the point A can be obtained by Equation 2.

  When the friction coefficient μ between the joint panel 3 and the mortar 6 is 0.5, the frictional force μN between the joint panel 3 and the mortar 6 can be obtained by Expression 3.

  Therefore, the formula of the balance between the moment due to the frictional force μN and the moment due to both shears Qs of the upper joint column 2 is the distance Lm from the point A to the center of gravity position of the effective cross section of the joint panel 3 that receives the support pressure, and the upper joint column 2 Using the height Lb up to the inflection point of the moment distribution, it can be expressed by Equation 4.

  In Formula 4, when the moment due to the frictional force on the right side is larger than the moment due to the column shearing force on the left side, the upper node column 2 does not slip out. From Equations 2, 3, and 4, when the compressive strength of the mortar 6 and the shapes and dimensions of the joint panel 3 and the upper joint column 2 are determined, the equation for calculating the pulling load Qs of the upper joint column 2 is represented by Equation 5. Show. An equation for calculating the swallowing length La of the upper joint column 2 necessary for a predetermined shear force of the upper joint column 2 is shown in Equation 6.

  As described above, the steel pipe columns and the steel pipe column joining method according to the present invention are useful for steel structure buildings, and are particularly suitable for steel structure buildings considering workability and dismantling properties.

It is a perspective view which shows the steel pipe pillar concerning the Example of this invention. It is a perspective view which shows an upper joint pillar and a lower joint pillar. It is a perspective view which shows a coupling panel. It is a schematic diagram which shows the dynamic mechanism of the steel pipe column shown in FIG. It is a longitudinal cross-sectional view which shows the effect | action state of the force in the junction part at the moment when the upper node pillar slips out. It is a cross-sectional view which shows the action state of the force in the junction part at the moment when the upper node pillar comes out.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower joint pillar 2 Upper joint pillar 3 Joint panel 4 Bolt 5 Nut 6 Mortar 11,21 Erection piece 11a, 21a Through-hole 12, 22, 32, 33 Bearing bar 31 Attachment part 31a Through-hole

Claims (3)

While installing the erection piece outside in the extending direction, the lower joint column with the support bar on the upper outer periphery,
An upright column with an erection piece standing outside in the extending direction and a supporting bar on the outer periphery of the lower part,
A joint in which the lower and upper erection pieces are connected in such a manner that they are separated from the outer peripheral surfaces of the lower and upper joint columns and cover the joint between the lower and upper joint columns. A panel,
A steel pipe column comprising a mortar filled between a lower node column and an upper node column and a joint panel.   The steel pipe column according to claim 1, wherein a supporting bar is provided at an inner upper end and an inner lower end of the joint panel. An erection piece erected outside the extending direction of the lower joint column provided with the supporting bar on the upper outer periphery and an erection piece erected outside the extending direction of the upper column provided with the supporting bar on the outer periphery of the lower part, After connecting with the joint panel in a manner to separate from the outer peripheral surfaces of the lower and upper joint pillars and cover the joint between the lower and upper joint pillars,
A steel pipe column joining method characterized by filling mortar between the lower and upper joint columns and the joint panel.

Images