JP2004225351A - Mounting structure of stud - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a stud which can be easily mounted to a beam. <P>SOLUTION: A PC steel rod 11 is inserted in a cylindrical body 10 embedded in the beam 7 to vertically penetrate in the beam 7. By the PC steel rod 11, base plates 4, 5 forming the end of opposed studs M holding the beam 7 are connected. A prestress is introduced to the steel rod 11 by fastening the nut 12. Hence, the strut M is fitted to the beam 7. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure for mounting a steel stud between upper and lower beams of a concrete building, and more particularly to a stud mounting structure effective for mounting a seismic control stud.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a mounting structure of a seismic control stud between upper and lower reinforced concrete beams, for example, there is a structure described in Patent Document 1.
This mounting structure forms a lower stud connection part made of reinforced concrete at the upper part of the lower beam and an upper stud connection part made of reinforced concrete at the lower part of the upper beam in the beam-column frame where the seismic control studs are arranged. A stud made of an extremely low yield point steel material is arranged between the two stud connecting portions, and attached by inserting both ends of the stud into the corresponding stud connecting portions.
[0003]
[Patent Document 1]
JP-A-11-270178
[Problems to be solved by the invention]
In the above mounting structure, when the stud connecting portion is precast, the mounting portion is easily increased in size, and the work of joining to the beam is troublesome.
Also, when the reinforced concrete stud connecting portion is constructed by casting in place, a formwork, a reinforcing bar, and concrete work for the stud connecting portion are required, and accordingly, the construction period becomes longer or it takes time and effort. .
[0005]
Further, since the stud connecting portion is configured to be inserted by inserting an end of the stud, the stud connecting portion needs to be a structure slightly larger than the stud.
In addition, there is a possibility that cracks may occur in the reinforced concrete stud connecting portion and a reduction in rigidity may occur. In this case, it may be assumed that yielding by the stud is delayed and the damping effect cannot be sufficiently exerted.
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a stud mounting structure in which a stud can be easily mounted on a beam.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a mounting structure of a stud made of a steel material to a beam made of reinforced concrete or steel reinforced concrete, and embedded in the beam while penetrating vertically through the beam. And a PC steel material inserted into the cylindrical body and whose upper and lower ends project above and below the cylindrical body, respectively, and a fixing tool is attached to one end of the PC steel material. The end of the PC steel material is fixed to the end of the stud by a connection tool.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a mounting structure of a stud M of this embodiment, and is an example of a case where a stud M made of steel is mounted on a reinforced concrete column-beam frame. The stud M of the present embodiment is a seismic control stud M, which is formed by joining joining steel materials 2 and 3 made of H-section steel to both sides of a stud body 1 made of a low yield point steel material, respectively. The joining steel material 2 constitutes the capital of the stud M, and the lower joining steel material 3 constitutes the column base of the stud M. Flat base plates 4 and 5 are formed on the end surfaces of the upper joining steel material 2 and the lower joining steel material 3, and a PC bar can be inserted into the base plates 4 and 5 as shown in FIG. 2. A plurality of insertion holes 6 are open.
[0008]
As shown in FIG. 3, a tubular body 10 made of a sheath tube with a vertical axis is embedded in each of the beams on each floor constituting the building, as shown in FIG. 3. The upper and lower ends of each cylindrical body 10 are open at the upper and lower surfaces of the beam, and have an inner diameter into which a PC steel rod 11 made of PC steel can be inserted. In FIG. 3, the illustration of the beam reinforcing bars is omitted.
[0009]
Here, the work of embedding the cylindrical body 10 only needs to be arranged at the time of concrete casting when constructing the beam, so that the labor for constructing the beam is not significantly increased. Note that the beam may be made of precast, or may be constructed on site by casting in place. Then, the studs M having the above configuration are arranged between the upper and lower beams 7 on each floor. At this time, as shown in FIG. 3, in the upper-floor studs M and the lower-floor studs M arranged with the beams 7 interposed therebetween, the base plate 5 of the pillar base of the upper-floor stud M and the lower-floor stud M are The base plate 4 of the capital is opposed to the base plate 4 with the beam 7 interposed therebetween, and the insertion holes 6 of the base plates 4 and 5 and the insertion hole 6 of the base plates 4 and 5 are arranged coaxially. A PC steel rod 11 is inserted so as to penetrate the cylindrical body 10, and a nut 12 is screwed and temporarily fixed to the upper end of the PC steel rod 11. In the case of the PC steel rod 11 of FIG. 3, an example is shown in which the bolt head 13 is formed at the lower end, but a nut may be screwed to the lower end to fix. Further, the top and bottom of the PC steel bar 11 may be arranged upside down.
[0010]
After the upper end and the lower end of the stud M are temporarily fixed to the beam 7 in this manner, after prestressing is introduced into each PC steel rod 11, the nut 12 is tightened, so that both ends of each stud M are formed. Each is attached to the beam 7.
Here, when viewed from the mounting structure of the column base of the stairs M on the upper floor, the base plate 4 and the head 13 of the PC steel bar 11 located at the capital of the lower floor stud M constitute a fixing tool, and the PC steel A nut 12 screwed into the upper end of the rod 11 constitutes a connection tool.
[0011]
Also, when viewed from the mounting structure of the capital of the lower floor stud M, the nut 12 screwed to the base plate 5 located on the upper floor stud M column base and the PC steel rod 11 projecting upward from the base plate 5 is as follows: The fixing tool is formed, and the head 13 of the PC steel bar 11 is formed as a connecting tool.
Before the final tightening (before the introduction of prestress), if necessary, the upper end surface or the lower end surface of the stud M is connected to the beam 7 for the purpose of adjusting the height or flattening the surface of the beam 7. Fill grout in between. In the drawings of the present embodiment, a case where the grout 14 is filled between the lower end surface of the stud M and the upper surface of the beam 7 is illustrated.
[0012]
Further, if necessary, grout is filled in the cylindrical body 10 in order to protect the PC steel rod 11 from corrosion and to cause adhesion between the cylindrical body 10 embedded in the beam 7 and the PC steel rod 11. May be. However, when the PC steel rod 11 is made of a steel material that has been subjected to an effective rust prevention treatment such as an unbonded steel material, it is not necessary to inject grout into the cylinder 10.
[0013]
Further, in the above description, the case where the studs M are arranged continuously on the upper and lower floors is described. However, for example, when another stud M is not arranged on the upper side such as the top floor, the studs M of the upper stairs M are arranged. Instead of the base plate 5, a support plate having the same configuration as the base plate 5 may be provided to fix the upper end of the PC steel bar 11.
In addition, even when another stud M is not arranged on the lower side, a supporting plate having the same configuration as the base plate 4 is arranged instead of the base plate 4 of the lower stud M, and the lower end of the PC steel rod 11 is arranged. What is necessary is just to fix.
[0014]
Here, a supplementary example of the mounting work of the studs M in the case where the studs M are arranged in a multilayer structure continuously above and below.
First, in order to attach the capital of the stud M temporarily fixed to the top floor, prestress is introduced into the PC steel bar 11 and the capital of the stud M is attached to the beam 7. Next, after filling the gap between the column base of the stud M and the beam 7 with grout, the PC steel rod 11 connecting the column base of the stud M of the top floor and the capital of the stud M of the lower floor is filled. To introduce prestress. As a result, the column base of the stud M on the top floor and the capital of the stud M arranged on the immediately lower floor are attached to the beam 7. By repeatedly performing the above construction toward the lower floor, the capitals and the pedestals of all the studs M are attached to the beam 7.
[0015]
In addition, when grout is filled in a column capital, it reverses to the above-mentioned construction procedure, and is performed from the lowest floor where the stud M is arranged to the position of the top floor where the stud M is arranged.
Next, the operation and effects of the above-described mounting structure will be described.
In the mounting structure of the stud M to the beam 7, the PC steel rod 11 is simply inserted into the cylindrical body 10 embedded in the beam 7 and prestress is introduced into the PC steel rod 11, so that the stud M is mounted. It is easy and can be constructed in a short construction period.
[0016]
In addition, since the mounting of the stud M is a mounting structure in which the stud M is crimped to the beam 7 by introducing prestress, it is possible to secure a sufficient degree of fixing to the column base and the column head. That is, since the rigidity of the attachment portion of the stud M to the beam 7 is high, it is possible to prevent a delay in yielding in the stud body 1 and to exert a sufficient vibration damping effect. That is, as shown in FIG. 4, since the stud body 1 exhibits elastic behavior until it yields, it is possible to yield at the stud body 1 at an early stage, and a large vibration damping effect (for example, by absorbing seismic energy). The effect of suppressing the shaking of the building) can be exhibited. FIG. 4 also shows the behavior in the case of the conventional example by a dashed line for comparison.
[0017]
Further, in the present embodiment, since the mounting member is also the cylindrical body 10 or the PC steel rod 11, the cost can be reduced.
Also, the main frame has almost no effect on the reinforced concrete work, and the stud M can be attached at any time after the reinforced concrete work is completed. When the grout is not filled in the cylindrical body 10, the seismic control studs M can be easily replaced by removing the nut 12.
[0018]
Further, since a stud M connecting portion for inserting the stud M as in the related art is unnecessary, the cross-sectional shape of the stud mounting portion can be designed to be small, so that the degree of freedom of the plan around the seismic control stud M is improved.
Here, the studs M are exemplified as the studs M, but the present invention is not limited to this, and any studs M made of steel can be attached.
[0019]
In addition, although the PC steel rod 11 is exemplified as the PC steel material, the prestress may be introduced by using another PC steel material such as a PC steel wire.
In addition, although the nut 12 is illustrated as the fixing device and the connecting device, fixing may be performed by using another fastening device.
Further, in the above description, the case where the beam is made of reinforced concrete is exemplified, but the beam may be made of steel reinforced concrete.
[0020]
【The invention's effect】
As described above, adopting the stud mounting structure of the present invention has an effect that the stud can be easily fixed to the beam.
[Brief description of the drawings]
FIG. 1 is a front view illustrating a stud mounting structure according to an embodiment of the present invention.
FIG. 2 is a plan view showing a base plate according to the embodiment according to the present invention.
FIG. 3 is an enlarged cross-sectional view illustrating details of a stud mounting structure according to an embodiment according to the present invention.
FIG. 4 is a view for explaining the restoring force of the damping stud in the mounting structure according to the embodiment according to the present invention.
[Explanation of symbols]
M stud 1 stud main body 2 steel material for upper joint 3 steel material for lower joint 4, 5 base plate 6 bolt insertion hole 7 beam 10 cylinder (sheath tube)
11 PC steel bar (PC steel material)
12 Nuts (connectors)
13 bolt head (fixer)
14 grout for joints

Claims (1)

An attachment structure of a stud made of steel to a beam made of reinforced concrete or steel reinforced concrete,
A tubular body embedded in the beam while penetrating the beam vertically, and a PC steel material inserted into the tubular body and having upper and lower ends protruding above and below the tubular body, respectively. A fixing tool is attached to one end of the PC steel material, and an end of the PC steel material is fixed to an end of the stud by a connecting tool.

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