JPS6332030A - Method for bonding pillar - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for joining columns when using a column in which the inside of a steel pipe is filled with concrete in advance, that is, a concrete-filled steel pipe column. It is about the method.

[Conventional technology]

FIG. 5 is a front view of a joint between columns by a conventional joining method, and FIG. 6 is a detailed sectional view of the joint.

In the figure, 1 and 2 are both upper and lower columns made of square steel pipes, 3 and 4 are connection support pieces that are pre-welded on the outer periphery of the joint 5 of columns 1 and 2, and 6 is a reconnection. A connecting plate 8 connects the support pieces 3 and 4 to the bolt/nut 7, and 8 is a backing metal used when the joint 5 of the columns 1 and 2 is welded. It is fixed.

Next, a method for joining the above pillars will be explained.

First, the pillars 1 and 2 are butted together at the joint portion 5, and then the connecting plate 6 is fastened to the connecting support pieces 3 and 4 using the dowel bolts and nuts 7 to firmly connect the pillars 1 and 2.

Next, the joint portion 5 is welded for the final time, and concrete 9 is placed inside the columns 1 and 2 to integrate the two.

After that, remove the connecting plate 6 and the connecting support pieces 3 and 4, and
Perform the exterior of step 2.

[Problem that the invention seeks to solve]

The conventional method of joining columns was performed as described above.

Therefore, most of the joining work is done on-site, and in particular, the upper and lower columns are welded on-site and then filled with concrete. method), it is difficult to completely fill the concrete with concrete. Therefore, the strength of the steel pipe concrete structure cannot be demonstrated.

Therefore, in order to solve the above-mentioned problems, it is conceivable to use columns whose m-pipes are filled with concrete in advance at a factory. However, in this case, there was a discontinuity with the concrete 1 that was filled from the beginning at the joint of the columns, and it was not easy to completely fill the gap with concrete.

Therefore, an object of the present invention is to provide a column joining method that allows integral connection with internal concrete at the joint part in order to take advantage of the advantages of concrete-filled steel pipe columns.

c) Means for Solving Problems] The column joining method according to the present invention is such that when concrete-filled steel pipe columns are joined on-site, the upper column is joined in a concave portion from the upper end to the lower end in the filled concrete. Using a pipe with continuous holes extending all the way to the end, concrete is poured into the joint between the two types with the steel pipes butt-jointed, and the poured concrete reaches the upper end of the through hole. It was decided that concrete pouring would be completed when the concrete was completed.

It is not good if the size of the through hole is too small, and it is disadvantageous if it is too large. Generally speaking, a diameter of 30 to 100 mm is suitable.

Concrete may be poured through an injection hole on the side of the joint, through a hole in a lower column, or through one of two holes in an upper column. .

If the strength is supplemented by inserting reinforcing bars into the joint in advance, full circumference welding is not necessary when joining steel pipes (partial butt welding only on the sides, excluding some corners, is sufficient).

[For production]

In the present invention, the through holes are provided in the filled concrete inside the steel pipe in a continuous manner from the upper end to the joint at the lower end, so that when concrete is poured into the joint between the upper and lower columns, the through holes are used to vent air. Acting as a hole, the concrete fills the through hole and rises through it to reach the top. Therefore, it can be confirmed that concrete has been filled into the joint at the same time. Moreover,
Since the filled concrete 1 from the beginning and this poured concrete are integrated, the stress between the steel pipe and the internal concrete can be sufficiently transmitted.

〔Example〕

Hereinafter, a structure for joining columns according to the method of the present invention will be explained with reference to the drawings.

FIG. 1 is a cross-sectional view of the first embodiment, showing a case where an injection hole for concrete 1 is provided on the side surface of the joint.

FIG. 2 is a sectional view taken along line 1--2 in FIG. In the figure, 10 and 11 are the upper and lower pillars to be joined, respectively.
Concrete 13 is placed inside each steel pipe 12 in advance.
The one filled at the factory is used. The steel pipe 12 generally has a hollow rectangular cross section, but other polygonal or circular cross sections may be used. Reference numeral 14 denotes a through hole provided in the filling concrete 13 of the upper pillar 10, and the concrete 13
It is formed simultaneously with the filling of the concrete 13, and the upper end of the concrete 13 communicates with the joint part 15 at the lower end. The joint portion 15 is formed in a hollow space recessed upward from the abutting end 12a of the rope 1r12, and its ceiling 15a is a roof-shaped sloped surface communicating with the through hole 14. Reference numeral 16 denotes a joint formed at the upper end of the lower column 11, which is a flat concave portion. Reference numeral 17 denotes reinforcing bars interposed within the rejoining parts 15 and 16, and deformed reinforcing bars are used. Reference numeral 18 denotes a concrete injection hole provided on the side surface of the upper joint 15, and this injection hole 18 is provided with a shutter (not shown) for opening and closing.

Next, a method for joining the pillars will be explained.

The lower pillar 11 is vertically erected using a conventional method. Reinforcing bars 17 are erected within the joints 16 of the columns 11 as necessary.

Next, attach the upper column 10 to the upper end of this column 11 with its steel pipe 12
They are abutted against each other, and their abutted ends 12a are vertically joined and supported by butt welding or the like.

Thereafter, concrete 19 is injected from the concrete 1 injection hole 18 provided on the side surface of the upper joint 15 using a concrete pump (not shown). The injected conc IJ-1-19 fills the lower joint 16 and then the upper joint 15.

Further, the air rises along the roof-shaped ceiling 15a of the joint 15, while the air is discharged through the through hole 14 communicating with the joint 15. Therefore, when the conch IJ-1-19 fills the joint 15, it gradually rises inside the through IL 14 and finally drains from the upper end of the pillar 10. Thus, joint 1
It can be seen that Nos. 5 and 16 were filled with poured concrete I.19. Moreover, the poured concrete 19 is integrated with the filled concrete 1 and 12 from the beginning, and the joint 15.
Coupled with the reinforcement by the reinforcing bars 17 interposed within the joints 16, the joint strength is strengthened.

Next, FIG. 3 is a sectional view of the second embodiment, showing the case where the concrete injection hole 18A is formed through the through hole 14A of the lower column 11A.

In the case of the second embodiment, it is possible to connect to columns further below the column 11A, and it is possible to complete the connections at several locations with one concrete pumping. Since the other configurations are the same as those in FIG. 1, the same reference numerals are given and the explanation will be omitted.

Next, FIG. 4 is a sectional view of the third embodiment, showing the upper column 10A.
Two through holes 14B and 14G in the filled concrete 13A
This is the case when . In this case, one of the through holes 14B is used as a concrete injection hole 18B, and poured concrete 19 is poured from above. Therefore, since there is no need to provide any holes in the ll tube, the joint strength can be further improved. The other configurations are the same as those in FIG. 1.

〔Effect of the invention〕

According to the present invention, there are the following effects.

(1) The advantages of using concrete-filled steel pipe columns are fully utilized. That is, the column members are homogeneous, easy to construct, and the construction period can be shortened.

(2) Since the concrete injected into the joint of the column joins with the filling concrete through the through hole provided in the filling concrete 1 from the beginning, it is possible to integrate the concrete at the joint. Therefore, discontinuity of the concrete can be prevented, and stress transmission between the steel pipe and the internal concrete can be performed well.

(3) By adding reinforcing bars to the joints to increase the strength, it is possible to integrate the concrete, making it relatively easy to butt weld W4 bolts together. Furthermore, during welding, there is no risk of deterioration of the internal concrete since the joint is left empty.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a first embodiment of a column joining structure according to the method of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG.
The figure is a sectional view of the second embodiment, FIG. 4 is a sectional view of the third embodiment, FIG. 5 is a front view of a column joint according to the conventional method, and FIG. 6 is a detailed sectional view of the joint. . 10, IOA, 11. IIA: Column, 12: Steel pipe, 13:
Filled concrete, 14, 14A, 14B. 14C: Through hole, 15, 16: Joint part, 18, 18A, 1
8B: Concrete injection hole, 19: Injected concrete.

Claims (1)

[Claims] Concrete (13) is placed inside the steel pipe (12) in advance.
When joining columns (10), (11) filled with ) until the through holes (14), (14A), (14
B) and (14C) are provided in a continuous manner, and the lower pillar (14C)
1), (11A) are provided with a concave joint (16) at the top, and with the steel pipes butt-joined together, concrete is poured into the joints (15), (16), and this pouring A method for joining columns, characterized in that pouring of concrete (13) ends when the concrete (13) ascends through the through hole and reaches the upper end.