JP3551998B2 - Earthquake-resistant wall - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shear wall having a precast plate disposed between an upper structural member such as a beam and a lower structural member.
[0002]
[Prior art]
Some conventional earthquake-resistant walls using precast plates have built-in steel plates combined in V-shape, Λ-shape, diamond shape, etc. On the other hand, it exerts earthquake resistance by applying a tensile force and a compressive force to the built-in steel plate. In that case, the concrete forming the precast plate is used as a buckling prevention and a fireproof coating when the steel sheet is subjected to a compressive force.
[0003]
[Problems to be solved by the invention]
The above-mentioned earthquake-resistant wall is mainly made of steel as a load-bearing element, and since the connection with the structural member is made by on-site welding and high-strength bolt connection, installation at the time of construction is troublesome. Also, it is very likely that the earthquake-resistant wall will be damaged in the event of a large earthquake, but in order to replace the damaged precast plate, you must cut the welded part and remove the bolts, Precast versions could not be easily replaced.
[0004]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an earthquake-resistant wall which has sufficient earthquake resistance and can be easily mounted at the time of construction or replaced when damaged.
[0005]
[Means for Solving the Problems]
The earthquake-resistant wall according to claim 1, wherein a precast plate is disposed between a lower structural member and an upper structural member arranged in parallel, and the precast plate is provided from a lower side facing the lower structural member. A strength mechanism is provided obliquely over an upper side facing the upper structural member and symmetrically disposed with respect to an axis extending along the vertical direction of the precast plate to resist a compressive force acting in the axial direction. For joining the precast plate and each structural member between the lower side of the precast plate located at the lower end of the precast plate and the lower structural member and between the upper side of the precast plate located at the upper end of the load bearing mechanism and the lower structural member means are provided respectively, resistant force mechanism comprises a hoop which surrounds the straight rebar and iron muscle arranged diagonally across the upper side from the lower side of the precast version, form a precast plate Is embedded in that concrete, characterized by comprising.
[0008]
According to a second aspect of the present invention, there is provided the earthquake-resistant wall according to the first aspect , wherein the joining means in the first wall comprises a female screw portion provided on one of the precast plate and the upper and lower structural members, and a female screw portion provided on the female screw portion. The pre-cast plate and a male screw member that is pressed against one of the upper and lower structural members, the protrusion end protruding from the female screw portion by rotating in a direction to release the screw engagement.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the earthquake-resistant wall of the present invention will be described with reference to FIGS.
The earthquake-resistant wall shown in FIG. 1 includes a precast plate 10 between a lower steel girder (lower structural member) 2 and an upper steel girder (upper structural member) 3 which are vertically separated from each other between columns 1 and 1. Are arranged.
[0010]
The precast plate 10 is a rectangular concrete plate whose vertical width is slightly shorter than the interval between the columns 1 and 1 and whose horizontal width is longer than the vertical length. In addition, a proof mechanism 12A, 12B is provided between the lower side 10a facing the lower girder 2 and the upper side 10b opposing the upper girder 3, and resists the compressive force acting in the axial direction. Have been.
[0011]
Each of the bearing mechanisms 12A and 12B includes a plurality of reinforcing bars 13 extending linearly between the center of the upper side 10b and both ends of the lower side 10a, and a spiral hoop bar 14 surrounding the reinforcing bars 13. When these are buried in the concrete 15 together with the reinforcing bars 11, strength against the compressive force acting in the direction in which the reinforcing bars 13 are provided is given.
[0012]
Lower joining means 20A and 20B are provided between the lower girder 2 and the precast plate 10, and upper joining means 30 is provided between the upper girder 3 and the precast plate 10.
[0013]
As shown in FIG. 2, both of the lower joining means 20A and 20B are provided with female screw cups 21 provided on the lower girders 3 opposite to both ends of the lower side 10a of the precast plate 10, and with female screw cups 21 respectively. It comprises a stopper cup 22 provided at each end of the lower side 10 a of the precast plate 10, and a male screw member 23 interposed between the female screw cup 21 and the stopper cup 22 and screwed to the female screw cup 21.
[0014]
The female screw cup 21 has a bottomed cylindrical shape, is opened upward, and is fixed by welding in a state where the axial direction is perpendicular to the flange surface of the lower large beam 3. Further, a female screw portion 21 a is formed on the inner peripheral surface of the female screw cup 21.
[0015]
The stopper cup 22 has a cylindrical shape with a bottom that is shallower than the female screw cup 21, is opened downward, and is fixed to the rebars 11 and 13 by welding in a state where the axis coincides with the axis of the female screw cup 21, and a part of the stopper cup 22 is welded. It is buried in concrete 15.
[0016]
The male screw member 23 has a cylindrical shape substantially equal to the inner diameters of the female screw cup 21 and the stopper cup 22, and has a male screw portion 23 a formed on the peripheral surface thereof, and is screwed to the female screw cup 21, and the upper end 23 b is formed of a stopper cup. 22 are fitted inside. As a result, the precast plate 10 is placed on the lower girder 3 and is joined via the lower joining means 20.
[0017]
As shown in FIG. 3, the upper connection means 30 includes a female screw cup 31 provided at the center of the upper side 10 b of the precast plate 10, a stopper cup 32 provided on the upper beam 2 opposite to the female screw cup 31, A male screw member 33 interposed between the female screw cup 31 and the stopper cup 32 and screwed to the female screw cup 31.
[0018]
The female screw cup 31 has the same shape as the female screw cup 21, is opened upward, and is fixed to the reinforcing bars 11 and 13 by welding in a state where the axial direction is perpendicular to the flange surface of the upper girders 2. Are buried in the concrete 15. Further, a female screw portion 31a is formed on the inner peripheral surface of the female screw cup 31.
[0019]
The stopper cup 32 has the same shape as the stopper cup 22, is opened downward, and is fixed to the flange surface of the upper large beam 2 by welding with its axis coinciding with the axis of the female screw cup 31.
[0020]
The male screw member 33 has the same shape as the male screw member 23, and has a male screw portion 33 a formed on the peripheral surface thereof and is screwed to the female screw cup 31, and the upper end 33 b is fitted inside the stopper cup 22. I have. Thereby, the precast plate 10 is in a state of being joined to the upper girders 2 via the upper joining means 30.
[0021]
Here, in the upper joining means 30, the control screw 33c is pierced in the male screw member 33 in the diametrical direction on the peripheral surface as shown in FIG. The male screw member 33 is moved upward by rotating the control screw 33c in a direction in which the male screw member 33 is disengaged from the female screw cup 31, and is fitted inside the stopper cup 32 located above. When the male screw member 33 is further rotated from this state, the upper end 23b of the male screw member 33 is pressed against the stopper cup 32, and a force can be generated in a direction to separate the female screw cup 31 and the stopper cup 32. The same applies to the lower joining means 20, and the precast plate 10 is locked between the upper girders 2 and the lower girders 3 using this force.
[0022]
A construction procedure of the earthquake-resistant wall configured as described above will be described. First, the female screw cup 21 constituting the lower joining means 20 is arranged on the lower large beam 2 at an appropriate interval, and the stopper cup 32 constituting the upper joining means 30 is arranged on the upper large beam 3. Next, the male screw member 23 is screwed into the female screw cup 21 on the lower girder 2, the stopper cup 22 is aligned with the upper end 23 a, and the precast plate 10 is placed and raised. Then, the male screw member 33 previously screwed into the female screw cup 31 is rotated and moved upward, and its upper end 33 a is fitted into the stopper cup 32. After that, the male screw members 23 and 33 are further rotated to press the lower beam 2 and the upper beam 3 respectively, thereby locking the precast plate 10 between the lower beam 2 and the upper beam 3.
[0023]
Next, FIG. 5 shows a case where a horizontal external force caused by an earthquake acts.
First, as shown in FIG. 5A, when an external force A is applied to the precast plate 10, a reaction force against the external force A acts between the upper joining means 30 and the lower joining means 20A via the proof mechanism 12A. , An axial compressive force acts along the bearing mechanism 12A. As shown in FIG. 5B, when an external force B is applied to the precast plate 10, a reaction force against the external force B acts between the upper joining means 30 and the lower joining means 20B via the proof mechanism 12B. , An axial compressive force acts along the bearing mechanism 12B.
[0024]
The anti-seismic wall can exhibit effective anti-seismic properties as a whole, since the precast plate 10 withstands external forces in the horizontal direction by the compressive forces acting in the axial direction by the anti-seismic mechanisms 12A and 12B.
[0025]
If the horizontal external force caused by the earthquake is very large and the compressive force acting on the load bearing mechanisms 12A, 12B exceeds the compressive strength, the precast plate 10 itself is intentionally destroyed and the energy of the external force is reduced. Can also be absorbed. At this time, since the broken precast plate 10 is connected to the lower girder 2 and the upper girder 3 by the lower bonding means 20 and the upper bonding means 30, respectively, and is easily removed, the broken precast plate 10 and the precast Each part integrated with the plate 10 is removed, a new precast plate 10 is attached according to the above-described construction procedure, and the earthquake-resistant wall can be regenerated. Therefore, it is possible to shorten the construction period and reduce the operation cost.
[0026]
In the present embodiment, the lower girder 2 and the upper girder 3 are made of steel. However, the upper and lower structural members supporting the precast plate 10 may be steel or reinforced concrete.
[0027]
【The invention's effect】
According to the earthquake-resistant wall of the first aspect, the precast plate is inclined from the lower side facing the lower structural member to the upper side facing the upper structural member to oppose the compressive force acting in the axial direction. A bearing mechanism is provided, and the precast plate and each structural member are joined between the lower side of the precast plate and the lower structural member and the upper side of the precast plate and the upper structural member at the end of the bearing mechanism. Since the joining means are provided respectively, when a horizontal external force is applied to the precast plate, the external force with respect to this external force is provided between the joining means on the lower structural member side and the joining means on the upper structural member side via a bearing mechanism. The reaction force acts, and the axial compressive force acts along the bearing mechanism, but the resisting mechanism opposes this compressive force, so the precast plate withstands the external force. It is possible to exert an effective earthquake resistance to.
Further, according to the earthquake-resistant wall described in claim 1, since the bearing mechanism is arranged symmetrically with respect to the axis along the vertical direction of the precast plate, the precast plate withstands alternating external forces in the horizontal direction, Further, effective earthquake resistance can be exhibited.
Further, according to the earthquake-resistant wall according to the first aspect, as the reinforcing mechanism, the linear reinforcing bar and the hoop reinforcing bar surrounding the reinforcing bar are buried in the concrete forming the precast slab, so that the axial compression is achieved. High strength against force can be obtained.
[0030]
According to the earthquake-resistant wall described in claim 2 , the joining means is screwed to the female screw portion provided on one of the precast plate and the upper and lower structural members, and the female screw portion is released. When it is rotated in the direction of rotation, it protrudes from the female screw portion and its protruding end is composed of a precast plate and a male screw member pressed against one of the upper and lower structural members, and is easily attached to and removed from the upper and lower structural members This eliminates the need for time-consuming operations such as welding and bolt joining, so that it is possible to shorten the construction period and reduce operating costs.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of a shear wall according to the present invention.
FIG. 2 is a side sectional view showing a joint portion between a lower structural member and a precast plate in FIG.
FIG. 3 is a side sectional view showing a joint portion between an upper structural member and a precast plate in FIG. 1;
FIG. 4 is a state explanatory view showing the movement of the joining means arranged between the upper and lower structural members and the precast plate.
FIG. 5 is an explanatory diagram showing a state of balance of forces in a precast plate when a horizontal external force is applied to a shear wall.
[Explanation of symbols]
2 Lower girders (lower structural members)
3 Upper girders (upper structural members)
DESCRIPTION OF SYMBOLS 10 Precast plate 12 Strength mechanism 13 Reinforcing bar 14 Hoop bar 20 Lower joining means (joining means)
21 Female screw cup (Female screw part)
23 male screw member 30 upper joining means (joining means)
31 Female screw cup (Female screw part)
33 Male thread member

Claims (2)

An earthquake-resistant wall in which a precast plate is arranged between a lower structural member and an upper structural member arranged in parallel,
The precast plate has a compression that is disposed obliquely from the lower side facing the lower structural member to the upper side facing the upper structural member , and is arranged symmetrically with respect to the axis along the vertical direction of the precast plate, and acts in the axial direction. A proof mechanism against the force is provided,
Between the lower side of the precast plate located at the lower end of the load-bearing mechanism and the lower structural member, and between the upper side of the precast plate located at the upper end of the load-bearing mechanism and the lower structural member, the precast plate and each structural member are placed. Joining means for joining are respectively provided ,
The load-bearing mechanism is characterized in that a linear reinforcing bar obliquely arranged from the lower side to the upper side of the precast plate and a hoop reinforcing bar surrounding the reinforcing bar are embedded in concrete forming the precast plate. Shockproof wall. In the earthquake-resistant wall according to claim 1 ,
The joining means is a female screw portion provided on one of the precast plate and the upper and lower structural members,
The female screw portion is screwed into the female screw portion, and the male screw member is protruded from the female screw portion by rotating in a direction to release the screw engagement, and the protruding end thereof is pressed against one of the precast plate and one of the upper and lower structural members. An earthquake-resistant wall characterized by that.

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