JPH0453224B2 - - Google Patents

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. be.

[Conventional technology]

FIG. 5 is a front view of a column joint made 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 pillars made of square steel pipes, 3 and 4 are connecting support pieces that are pre-welded on the outer periphery of the joints 5 of 1 and 2, respectively, and 6 is both connecting supports. A connecting plate that connects pieces 3 and 4 with bolts and nuts 7, 8 is a column 1,
This is a backing metal used when the joint portion 5 of the two is actually welded, and is fixed to the inner surface of one of the columns by welding in advance.

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, and concrete 9 is placed inside the columns 1 and 2 to integrate them.

After that, the connecting plate 6 and the connecting support pieces 3 and 4 are removed and the columns 1 and 2 are covered.

[Problem that the invention seeks to solve]

The conventional method of joining pillars 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. Difficult to fill completely. Therefore, the strength of the steel pipe concrete structure cannot be demonstrated.

Therefore, in order to solve the above problems, it may be possible to use columns whose steel pipes are filled with concrete in advance at a factory. However, in this case, the joints of the columns were discontinuous with the concrete that had been filled from the beginning, and it was not easy to completely fill the gaps 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.

[Means for solving problems]

In the column joining method according to the present invention, when concrete-filled steel pipe columns are joined on-site, the upper column has a through hole that communicates with the filled concrete column from the upper end to the joint of the recess at the lower end. Using the equipment provided, concrete is poured into both joints with the steel pipes butt-jointed, and the concrete pouring is finished when the poured concrete reaches the upper end of the through hole. This is what I did.

It is not good if the size of the through hole is too small,
It is also inconvenient if it is too large. Generally, the diameter is 30~
A range of 100mm is appropriate.

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

If the strength is supplemented by inserting reinforcing bars into the joints in advance, joining the steel pipes does not require full circumference welding, but only partial butt welding on the sides excluding the corners is sufficient.

[Effect]

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 filling concrete 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 a concrete injection hole is provided on the side surface of the alignment part. FIG. 2 is a sectional view taken along the line of FIG. 1. In the figure, numerals 10 and 11 are upper and lower columns to be joined, respectively, and the inside of each steel pipe 12 is filled with concrete 13 in advance at a factory. 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 column 10, which is formed at the same time as filling the concrete 13, and communicates from the upper end of the concrete 13 to the joint 15 at the lower end. The joint 15 is the butt end 12 of the steel pipe 12
It is formed in a hollow space recessed upward from a, and its ceiling 1
5a is a roof-shaped inclined surface that communicates with the through hole 14. 16 is a joint formed at the upper end of the lower pillar 11, and is a flat concave portion. Reference numeral 17 denotes a reinforcing bar interposed within both joints 15 and 16, and a deformed reinforcing bar is used. 18 is a concrete injection hole provided on the side surface of the upper joint 15;
8 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, the upper column 10 is supported at the upper end of this column 11 by abutting the steel pipes 12 against each other and vertically joining the abutted ends 12a by butt welding or the like.

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

Furthermore, 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, once the concrete 19 fills the joint 15, it gradually rises inside the through hole 14 and finally overflows from the upper end of the column 10. It can thus be seen that the joints 15 and 16 are filled with poured concrete 19. Moreover, the poured concrete 19 is integrated with the filling concrete 12 from the beginning, and together with the reinforcement by the reinforcing bars 17 interposed within the joints 15 and 16, the joint strength is strengthened.

Next, FIG. 3 is a sectional view of the second embodiment, in which the concrete injection hole 18A is connected to the through hole 11A of the lower column.
4A.

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, in which two through holes 14B and 14C are provided in the filling concrete 13A of the upper column 10A. 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 steel pipe, it is possible to further improve the joint strength. 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 pipes are fully utilized. That is,
The column members are homogeneous, making construction easy and shortening the construction period.

(2) The concrete poured into the column joints fills the holes provided in the initial filler concrete and joins with the filler concrete, making it possible to integrate the concrete at the joints. Therefore, discontinuity of the concrete can be prevented, and stress transmission between the steel pipe and the internal concrete can be performed well.

(3) Butt welding of steel pipes is relatively easy because it is possible to integrate the concrete by adding reinforcing bars to the joints to increase the strength. Furthermore, during welding, there is no risk of deterioration of the internal concrete since the joint is left empty.

[Brief explanation of drawings]

Figure 1 shows a first example of a column joining structure according to the method of the present invention.
2 is a sectional view taken along the line of FIG. 1, FIG. 3 is a sectional view of the second embodiment, FIG. 4 is a sectional view of the third embodiment, and FIG. 5 is a sectional view of the conventional method. FIG. 6 is a front view of the joint of the columns, and a detailed sectional view of the joint. 10, 10A, 11, 11A: Column, 12: Steel pipe, 13: Filled concrete, 14, 14A, 1
4B, 14C: Through hole, 15, 16: Joint part, 1
8, 18A, 18B: Concrete injection hole, 1
9: Pouring concrete.

Claims (1)

[Claims] 1 Concrete 1 is placed inside the steel pipe 12 in advance.
In the case where the columns 10, 11 filled with 3 are joined vertically, the upper columns 10, 10A have through holes 14, 14A, 14B in the filled concrete 13 from the upper end to the joint 15 of the recess at the lower end. ,14
C is provided in a continuous manner, and the lower pillars 11, 11A
A recessed joint portion 16 is provided at the upper part of the joint portion 1, and the joint portion 16 is provided in a state where the steel pipes are butt-jointed.
5, 16, and the pouring of concrete is completed when the poured concrete 19 ascends through the through hole and reaches the upper end.