JPH04371635A - Connection of floorslab and post - Google Patents

Abstract

PURPOSE:To easily construct a connecting part for a post and a floorslab, and obtain a connecting method for the post and floorslab, having the resistance against a bending stress within the post at the time of earthquakes. CONSTITUTION:A beam-form haunch 24 is shaped at the end of a floor slab 10 and a connecting steel member 28 is contained in the beam-form haunch 24 to be freely drawn. And a steel bar 20 having a screw at the end thereof is provided in a specified level of the post 12. After the post 12 is erected at a specified position, the floorslab 10 is raised up to a specified level and the connecting steel member 28 is drawn from the floorslab 10. And then the screw of the steel bar 20 is inserted into the insertion hole 34 provided in the connecting steel member 28 to fit nuts on the screw for fixing the connecting steel member 28 at the steel bar 20. In this way, the floorslab 10 and the post 12 are completely connected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a floor slab and a column used in a building frame, and more particularly to a method for joining a lifting floor slab and a column.

0002

[Prior Art] In recent years, columns are erected in advance, and then the floor slab is lifted up to a predetermined height.
However, a method of constructing a building frame by joining pillars at predetermined positions has become widely used.

0003

[Problems to be Solved by the Invention] The drawbacks of the above construction method are that it is not easy to construct the joint between the column and the floor slab, and that the column has sufficient rigidity and strength to withstand the bending stress that occurs during an earthquake. It is difficult to ensure that The present invention has been made in view of the above circumstances, and its purpose is to easily construct the joint between a column and a floor slab, and to reduce the bending stress within the column during an earthquake. It is an object of the present invention to provide a method for joining a column and a floor slab that has resistance against the above-mentioned problems.

0004

[Means for Solving the Problems] In order to solve the above problems, a method for joining a floor slab and a column according to claim 1 of the present invention includes the following steps:
A joining member is attached to the end of the floor slab so that it can be freely pulled out within the surface of the floor slab, and a column having a floor slab connection part that connects the floor slab is erected at a predetermined position at a predetermined height, A joining member attached to an end of the column is opposed to a floor slab connecting portion of the column, the joining member is pulled out from the floor slab end, and the joining member is further connected to the floor slab connecting portion. It is characterized by:

[0005] The method for joining a floor slab and a column according to claim 2 of the present invention is the method according to claim 1, wherein the joining member has a through hole bored at an end thereof. The floor slab connection part is a rigid material, and the floor slab connection part is equipped with a steel rod with a thread formed at the end, and in the process of connecting the joining member to the floor slab connection part, Insert the male thread at the end of the equipped steel rod into the through hole of the rigid member for joining, and screw a nut onto the male thread to connect the rigid member for joining and the floor slab connection part. It is characterized by this.

[0006] Furthermore, the method for joining a floor slab and a column according to claim 3 of the present invention is the method according to any one of claims 1 and 2, wherein a corbel is formed at an end of the floor slab. The joining member is installed in the corbel so that it can be freely pulled out.

[0007]

[Operation] According to the method of claim 1, by pulling out the joining member from the end of the floor slab and further connecting the joining member to the floor slab connection part of the pillar, the pillar and the floor slab can be easily joined. can be completed.

According to the method according to claim 2, the male thread at the end of the steel rod installed at the floor slab connection part of the column is inserted into the through hole drilled in the rigid member for joining, and the male thread is By screwing a nut into the column, you can more easily complete the connection between the column and the floor slab.

According to the method described in claim 3, by forming corbels at the ends of the floor slab, it is possible to provide the floor slab with sufficient resistance against bending stress applied to columns during earthquakes. It is.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for joining a floor slab and a column according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, FIGS. 1 and 2 are diagrams showing a joint structure between a floor slab 10 and a column 12 formed according to this embodiment. The pillar 12 is a vertically erected prism with a square cross section, and its material is appropriately selected in consideration of the required cross-sectional area and required strength. As examples, concrete columns, steel pipe columns, concrete-filled steel pipe columns, reinforced concrete columns, etc. can be used.

A floor slab connection portion 14 for connecting the floor slab 10 is provided at a predetermined height of the column 12. Through holes 16 and 18 are bored in the floor slab connection portion 14 in the horizontal direction so as to pass through the column 12. Through holes 16, 18
are formed along directions perpendicular to each other. Further, the through holes 16 and 18 are formed at different heights so as not to communicate with each other. And these through holes 16,1
A steel rod 20 having threads formed at both ends is inserted through the column 8 so that the male threads at both ends protrude from the column 12. This steel rod 20 may be a so-called PC steel rod.

On the other hand, the floor slab 10 is a reinforced concrete slab with reinforcing bars 22 disposed therein, and is disposed in a horizontal plane and supported by columns 12. A beam-shaped haunch 24 is formed at the end of the floor slab 10 surrounding the column 12 in a direction along the axial direction of the steel rod 20 attached to the floor slab connection part 14 of the column 12. Each beam type haunch 2
4, a passage 26 is provided along the axial direction of the steel rod 20.
is formed.

[0013] A joining steel material 28 is inserted into the passage 26 so as to be freely drawn out within the surface of the floor slab 10. The joining steel material 28 includes an H-shaped steel 30 and an H-shaped steel 3 at one end of the H-shaped steel 30.
0 and a thick steel plate 32 vertically welded. The joining steel material 28 is inserted into the passage 26 so that the flange portion of the H-section steel 30 is arranged horizontally. Note that the passage 26 of the floor slab 10 and the H-shaped steel 30 of the joining steel material 28 are in contact with almost no gap. That is, passage 26
It is also formed to have an H-shaped cross section. However, the surface of the H-section steel 30 is coated with a release agent such as grease, which does not adhere to concrete. Therefore, the H-shaped steel 30 can easily reciprocate within the passage 26 without being obstructed.

The thick steel plate 32 is exposed from the floor slab 10. The thick steel plate 32 is provided with a through hole 34 that penetrates in the thickness direction. The through holes 34 are formed at positions corresponding to the through holes 16 and 18 of the pillar 12. The end portions of the steel rods 20 that have been inserted into the through holes 16 and 18 are also inserted into the through holes 34 . Steel rod 2
Both ends of 0 protrude thick steel plates 32 of two joining steel materials 28 which are also adjacent and facing each other. Nuts 36 are screwed onto both ends of the steel rod 20, and by tightening the nuts 36, the thick steel plate 3 of the joining steel material 28
2 is fixed to the pillar 12.

As described above, the floor slab 10 and the column 12 are joined to each other by connecting the joining steel member 28 attached to the floor slab 10 to the column 12. As shown in FIGS. 1 and 2, a space 38 is provided between the pillar 12 and the floor slab 10 body joined to the pillar 12, and this space 38 is filled with concrete. ,
It is filled by post-filling.

Next, a method for forming the above-described joint structure between the floor slab 10 and the pillars 12 will be explained with reference to FIGS. 3 to 5. First, as shown in FIG. 3, a pillar 12 is erected at a predetermined position. At this time, the floor slab connection part 1 of the column 12
A steel rod 20 is attached to each of the through holes 16 and 18 of 4. Meanwhile, the floor slab 10 is also placed in a predetermined position. At this time, a joining steel material 28 is attached to each passage 26 of the floor slab.

Next, as shown in FIG. 4, the floor slab 1
0 and align it with the floor slab connection part 14 of the column 12 at the same height. In this way, the thick steel plate 32 of the joining steel material 28 attached to the end of the floor slab 10 is made to face the floor slab connection part 14. The joining steel material 28 is then slid along the passage 26 and pulled out from the floor slab 10. Then, the end of the steel rod 20 is inserted into the through hole 34 of the thick steel plate 32 of the joining steel material 28, and the nut 36 is screwed onto the male thread of the end. In this way, the joining steel material 28 is fastened to the pillar 12, and the joining between the floor slab 10 and the pillar 12 is completed.

Subsequently, as shown in FIG. 5, concrete is post-cast in the space 38 between the floor slab 10 body and the pillar 12 using an appropriate formwork to fill the space 38. .

Next, with reference to FIG. 6, the behavior of the frame structure mainly composed of the floor slab 10 and columns 12 constructed as described above during an earthquake will be explained.

As shown by the white frame arrow in FIG. 6, a horizontal load is applied to this frame structure during an earthquake. For this reason, column 1
2 is inclined obliquely, and rotational force is applied to the joining steel material 28. At this time, the beam-shaped haunch 24 of the floor slab 10 is attached to the joining steel material 2.
Since it resists the rotation of the column 8, the inclination of the column is suppressed as a result. Therefore, the beam-shaped haunches 24 need to be able to exhibit sufficient resistance to withstand large bending moments and shearing forces. In addition, the joining steel material 28
The bending rigidity and yield strength of the material need to be commensurate with this resistance.

Although one embodiment of the present invention has been described above with reference to the drawings, it goes without saying that the present invention is not limited to the above-described embodiment and that various modifications, variations, and additions are possible. stomach. For example, in the above embodiment, H-beam steel 30 is used as the joining steel material 28, but it goes without saying that materials with other cross sections may be used. Further, in the above embodiment, the space 38 between the floor slab 10 body and the column 12 is filled with concrete, but it goes without saying that other filling materials, such as mortar, may be used.

[0022]

[Effects of the Invention] As is clear from the above explanation, the method for joining floor slabs and columns of the present invention exhibits the following excellent effects. That is, according to the method according to claim 1,
By pulling out the joining member from the end of the floor slab and further connecting the joining member to the floor slab connection part of the column,
You can easily complete the connection between columns and floor slabs. During this joining, there is no work such as welding or connecting reinforcing bars, and workability is extremely good. Further, since the joining member can be freely pulled out, lifting of the floor slab to a predetermined height can be easily carried out without any damage.

According to the method according to claim 2, the male thread at the end of the steel rod installed at the floor slab connection part of the column is inserted into the through hole drilled in the rigid member for joining, and the male thread is By screwing a nut into the column, you can more easily complete the connection between the column and the floor slab.

According to the method described in claim 3, by forming corbels at the ends of the floor slab, it is possible to provide the floor slab with sufficient resistance against bending stress applied to columns during earthquakes. It is.

[Brief explanation of drawings]

FIG. 1 is a side view showing a joint structure of a floor slab and a column formed by a method according to an embodiment of the present invention.

FIG. 2 is a top view of the joining structure of FIG. 1;

FIG. 3 is a diagram for explaining a method according to an embodiment of the present invention, and is a side view showing a state in which a floor slab is placed after pillars are erected.

4 is a side view showing a state in which the floor slab is joined to a column after being lifted from the state shown in FIG. 3; FIG.

5 is a side view showing a state in which concrete is post-cast and filled between the floor slab and the columns from the state shown in FIG. 4; FIG.

FIG. 6 is a side view showing the behavior of the joint structure in FIG. 1 during an earthquake.

[Explanation of symbols]

10 Floor slab 12 pillars 14 Floor slab connection part 20 Steel bar 24 Haunch 28 Steel material for joining (rigid material for joining) 34 Through hole 36 Nut.

Claims (3)

[Claims] Claim 1: A joining member is attached to an end of a floor slab so that it can be pulled out within the surface of the floor slab, while a column having a floor slab connection part that connects the floor slab is erected at a predetermined position at a predetermined height. The joining member attached to the end of the floor slab is opposed to the floor slab connecting portion of the pillar, the joining member is pulled out from the end of the floor slab, and the joining member is connected to the floor slab. A method for joining floor slabs and columns, which is characterized by connecting them to the sections. 2. The method according to claim 1, wherein the joining member is a rigid member for joining with a through hole bored at an end, and the floor slab connection part includes a joining member having a through hole at an end. A steel rod with a thread formed thereon is equipped, and in the process of connecting the joining member to the floor slab connection part, the male thread at the end of the steel rod installed in the floor slab connection part is connected to the rigid joining member. A method for joining a floor slab and a column, characterized in that the rigid material for joining and the floor slab connection portion are connected by inserting the material into a through hole and screwing a nut onto the male thread. 3. The method according to claim 1, wherein a corbel is formed at an end of the floor slab, and the joining member can be freely pulled out into the corbel. A method for joining floor slabs and columns, characterized in that the floor slabs and columns are attached to.