JPH07102637A - Joint structure for steel pipe columns - Google Patents

Abstract

PURPOSE:To insert an upper floor column in space between the splice plates of a lower floor column even in an aslant state at the time of jointing both columns to each other, and make fine adjustment for erection accuracy after the insertion of the upper floor column by tightening and jointing both columns to each other with a unidirectional bolt via splice plates). CONSTITUTION:Jointing splice plates 3 are projected from the upper end of a lower floor column 1, while slits 6 of length approximately equal to jointing length with the lower floor column 1 are formed at four corners on the lower end of an upper floor column 2. Then, the lower end of the upper floor column 2 is inserted in space between the splice plates 3 on the upper end of the lower floor column 1, and the column 2 is tightened and fixed to the column 1 with unidirectional high tensile bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between steel pipe columns, which are closed cross-section materials, in the fields of civil engineering and construction.

[0002]

2. Description of the Related Art As an example of using a unidirectional bolt that can be tightened from only one side as a structure for joining closed cross-section materials such as steel pipe columns to each other, conventionally, for example, those shown in FIGS. is there.

This is because, when joining an upper floor pillar and a lower floor pillar made of steel pipes, splice plates 3 are normally high strength bolts 4 or one-way type on both inner and outer sides of the four side surfaces of the upper end portion of the lower floor pillar 1. The splice plate 3 is fixed in advance by bolts, and the upper portion of the splice plate 3 is projected upward from the upper end portion of the lower floor pillar 1. Then, at the construction site, the lower portion of the upper floor pillar 2 is inserted between the inner and outer splice plates 3 protruding from the lower floor pillar 1, and the lower end portion of the upper floor pillar 2 is joined to the upper end portion of the lower floor pillar 1, The lower part of the upper pillar 2 and the splice plate 3 are fastened and fixed with a unidirectional bolt 5.

[0004]

In the structure in which the lower portion of the upper floor pillar 2 is inserted between the splice plates 3 which doubly project from the upper portion of the lower floor pillar 1 as described above, the upper floor pillar 2 is replaced by the lower floor pillar 1 Must be vertically installed from directly above, and cannot be inserted between the splice plates 3 of the lower floor pillar 1 even if the upper floor pillar 2 is slightly inclined as shown in FIG.

Further, since the upper floor 2 has a closed cross-section material and the four side surfaces are not individually moved, the upper floor 2 is inserted between the splice plates 3 of the lower floor 1 as shown in FIG. After that, it is almost impossible to adjust the erection accuracy in the horizontal direction or the diagonal direction indicated by the arrow.

The object of the present invention is to eliminate the disadvantages of the conventional example, and to fix the lower floor pillar and the upper floor pillar with a one-way bolt through a splice plate so that the lower floor pillar and the upper floor pillar are fixed. When joining steel pipe columns, it is possible to insert the upper floor columns between the splice plates of the lower floor columns even in an oblique state, and to make fine adjustments to the erection accuracy after insertion. It is in.

[0007]

In order to achieve the above object, the present invention provides a splice plate for joining to the upper end of a lower floor pillar so that the lower floor pillar is provided at four corners of the lower end of the upper floor pillar. A slit is formed with almost the same length as the joint length of the upper floor pillar, and the lower end of the upper floor pillar is inserted between the splice plates attached to the upper ends of the lower floor pillars. The gist is to tighten and fix, and to form a stop hole at the upper end of the slit.

[0008]

According to the present invention as set forth in claim 1, since each side surface of the lower end portion independently moves due to the slit formed in the lower end portion of the upper floor pillar, only this portion is not a closed cross section, and thus, the upper floor is formed. It can be inserted between the splice plates of the lower columns even if the columns are diagonal. Further, even after the insertion, since each side surface of the lower end portion of the upper floor can be independently moved, the erection accuracy can be adjusted.

According to the second aspect of the present invention, in addition to the above action, since the stop hole is formed at the upper end of the slit, it is possible to prevent the occurrence of cracks due to stress concentration or the like.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a front view of an embodiment of a joining structure of steel pipe columns and steel pipe columns according to the present invention before joining, and FIG. 2 is a perspective view of a lower portion of an upper floor column, which is shown in FIGS. The same components as those of the conventional example are designated by the same reference numerals.

Also in the present invention, the lower floor pillar 1 and the upper floor pillar 2 which use steel pipe columns having a closed cross-section are joined by tightening and fixing them with the unidirectional bolt 5 via the splice plate 3. As in the conventional case, the splice plate 3 is normally pre-tightened with the high-strength bolts 4 on the inside and outside of the upper surface of the lower floor pillar 1 so that the upper portion of the splice plate 3 projects from the upper portion of the lower floor pillar 1. deep.

On the other hand, slits 6 are formed at the four corners at the lower end of the upper pillar 2 as shown in FIG. This slit 6
Is formed to have substantially the same length as the joint length that is the protruding length of the splice plate 3 from the lower floor pillar 1. A stop hole 7 may be formed at the upper end of the slit 6.

As described above, in order to join the upper floor pillar 2 to the lower floor pillar 1, the lower portion of the upper floor pillar 2 is inserted between the inner and outer splice plates 3 protruding from the lower floor pillar 1. . In this case, since the slit 6 is formed in the lower part of the upper floor pillar 2, each side surface moves independently in this lower part as shown in FIG. Therefore, even if the upper floor pillar 2 is in a slanted state, it can be inserted between the splice plates 3 of the lower floor pillar 1, and the erection accuracy can be adjusted even after the insertion.

After inserting the upper floor pillar 2 between the splice plates 3 of the lower floor pillar 1, the protruding portion of the splice plate 3 and the upper floor pillar 2 are fastened and fixed with unidirectional bolts 5.
As a result, the upper floor pillar 2 is joined to the lower floor pillar 1 via the splice plate 3.

In this joined state, the splice plate 3
Since the upper end of is located at almost the same level as the slit 6,
The slit 6 does not significantly impair the bonding strength.

The stop hole 7 formed at the upper end of the slit 6 disperses the stress concentrated at the root of the slit 6 to prevent cracking due to stress concentration.

[0017]

As described above, the joining structure of the steel pipe pillar and the steel pipe pillar according to the present invention is performed by tightening and fixing the lower floor pillar and the upper floor pillar with the unidirectional bolt through the splice plate. When the upper floor pillar is joined to the floor pillar, the upper floor pillar can be inserted between the splice plates of the lower floor pillar even in an oblique state, and the erection accuracy after insertion can be finely adjusted.

[Brief description of drawings]

FIG. 1 is a front view of a steel pipe column and a steel pipe column joining structure according to an embodiment of the present invention before joining.

FIG. 2 is a perspective view of a lower portion of an upper floor column showing an embodiment of the joining structure of the steel pipe column and the steel pipe column of the present invention.

FIG. 3 is an explanatory view showing the operation of the lower portion of the upper floor column showing the embodiment of the joining structure of the steel pipe column and the steel pipe column of the present invention.

FIG. 4 is a front view of a joined state showing an embodiment of a joined structure of a steel pipe column and a steel pipe column of the present invention.

FIG. 5 is a front view of a conventional example of a joint structure of steel pipe columns and steel pipe columns before joining.

FIG. 6 is a front view of a state after joining showing a conventional example of a joining structure of steel pipe columns and steel pipe columns.

FIG. 7 is a cross-sectional plan view showing a joined structure of steel pipe columns and a steel pipe column in a conventional example after joining.

FIG. 8 is a front view of a joining structure of a steel pipe column and a steel pipe column at the time of joining by a conventional example.

FIG. 9 is a front view showing another example of the joining structure of the steel pipe columns and the steel pipe columns according to the conventional example when joining.

[Explanation of symbols]

 1 ... Lower pillar 2 ... Upper pillar 3 ... Splice plate 4 ... Normal high-strength bolt 5 ... Unidirectional bolt 6 ... Slit 7 ... Stop hole

Claims (2)

[Claims] 1. A splice plate for joining is provided at the upper end of the lower floor pillar so as to project, and slits are formed at the four corners of the lower end of the upper floor pillar at a length substantially the same as the length of the joint with the lower floor pillar, Steel pipe column and steel pipe column characterized in that the lower end of the upper floor column is inserted between the splice plates attached to the upper ends of the lower floor columns and the upper column is fastened and fixed to the lower column with one-way bolts. Joint structure. 2. The joint structure of a steel pipe column and a steel pipe column according to claim 1, wherein the slit forms a stop hole at the upper end.