JP3159042B2 - Precast concrete curtain wall mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete curtain wall (hereinafter abbreviated as "PC curtain wall") mounting structure, and more particularly to a PC curtain wall capable of facilitating repair work after an earthquake. The present invention relates to an improvement in the mounting structure of the above.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a PC curtain wall 2 to be attached to a building as an exterior material has anchor bolts 4 erected at four corners at upper and lower positions on the back surface of the PC curtain wall 2, and the upper floor and the upper floor. Building structure 6 on lower floor
(For example, a slab, a beam, or the like), and is fastened and attached to a fastener 8 formed of an L-shaped bracket or the like fixed to a slab or a beam. Here, the attachment of the fastener 8 to the building structure 6 is usually integrated by welding or the like.

[0003] The load of the curtain wall 2 is supported on the upper or lower floor structure 6 via load receiving bolts 10 at two locations, that is, upper and lower portions thereof.

[0004] By the way, the building is vibrated and deformed by the wind or the earthquake, and when the deformation is large, the interlayer displacement between the upper floor and the lower floor of the building structure 6 accompanying the deformation is directly applied to the curtain wall 2. When it reaches, curtain wall 2
Is destroyed by the action of excessive force. Therefore, it is necessary to attach the curtain wall 2 to the building structure 6 so that the interlayer displacement between the upper floor and the lower floor can be absorbed to some extent. For this reason, as a mounting method for absorbing such interlayer displacement, horizontal movement (sway) has been roughly divided into the conventional methods.
Two methods, a method and a rotation (locking) method, are adopted.

In the horizontal moving system, for example, as shown in FIG. 4 (a), an upper anchor bolt 4a of a curtain wall 2 is rigidly connected to a fastener fixed to a building structure on an upper floor. While the curtain wall 2 is displaced integrally with the building structure on the upper floor, the anchor bolt 4b on the lower side is slidable relative to the fastener fixed to the building structure on the lower floor in the horizontal direction. The one shown in FIG. 3 corresponds to this horizontal movement type. That is, as shown in FIGS. 3A and 3B, the upper anchor bolt 4a is rigidly connected to the fastener 8a welded to the beam 12 (building structure 6) on the upper floor. The lower anchor bolt 4b is fastened and fixed to a fastener 8b provided integrally with the mounting base 16 (building structure 6) of the slab 14 on the lower floor so as to be relatively movable in the horizontal direction. As shown in (c), the anchor bolt 4 formed on the fastener 8b
The insertion hole 9 of b is a horizontally long loose hole.

In the above-mentioned rotation system, for example, as shown in FIG. 4B, four anchor bolts 4 are fastened and connected to each fastener so as to be relatively rotatable.
When the interlayer displacement occurs, the curtain wall 2 is rotated (locked) with the load receiving bolt 10 as a fulcrum to follow the displacement, thereby absorbing the interlayer displacement. In this case, the anchor bolt 4 and the fastener are used. Is relatively small in the horizontal direction and large in the vertical direction, so that a vertically long insertion hole is formed in the fastener.

[0007]

However, in such a conventional mounting structure, when a larger deformation than originally expected occurs in the building structure 6 due to a large earthquake or the like, the interlayer displacement accompanying the deformation is long. The anchor bolt 4 cannot be absorbed by the insertion hole 9 formed as a loose hole.
And the fastener 8 interfere with each other, so that an excessive force is applied to the PC curtain wall 2 and the PC curtain wall 2
There was a problem that was damaged.

[0008] The damage in such a case is a crack generated in the concrete slab 2 a of the PC curtain wall 2, breakage of the welded portion of the fastener 8,
Alternatively, since the form of destruction is diverse and disorderly, such as a breakage of the anchor bolt 4, it may occur at various places. The surrounding area had to be thoroughly investigated.

In addition, since the peripheral portion of the fastener 8 is usually covered with a refractory material or the like, it takes a lot of labor, labor and time to find the damaged portion alone, and furthermore, it has various destruction forms. There is a problem that it is necessary to perform various repairs in response to the repairs, and it takes a lot of cost and time to recover the repairs.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent a PC curtain wall of a building from being damaged during an earthquake disaster as much as possible, and to provide a method for preventing damage to a PC curtain wall. Not only can be concentrated on a predetermined part, but also its destruction form can be assumed in advance,
Accordingly, it is an object of the present invention to provide a PC curtain wall mounting structure capable of recovering a building and promptly reusing the building.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a bolt integrally provided on the back surface of a precast concrete curtain wall is fastened to a fastener provided on a building structure side. In the mounting structure of the precast concrete curtain wall to be fixed and fixed, while the fastener is detachably fixed to the building structure, and the fastener,
When the force transmitted to the precast concrete curtain wall via the fastener becomes excessive due to the deformation of the building structure, a stress absorbing portion that yields and deforms in advance before the curtain wall is damaged is provided. It is characterized by.

According to the PC curtain wall mounting structure of the present invention having the above-described structure, even if a large deformation occurs in the building structure due to an earthquake or the like, the stress of the fastener is first absorbed before each part of the PC curtain wall is damaged. Since the part yields and deforms and absorbs the force transmitted to the curtain wall, damage to the PC curtain wall can be prevented as much as possible.

In addition, it is possible to concentrate the rupture points due to the deformation of the building structure on the fastener, and it is possible not only to anticipate the destruction form in advance, but also to use the zipper when the PC curtain wall is damaged. Since yield deformation has occurred, the damage state of the PC curtain wall can be predicted by first examining the damage state of the fastener.
If the damage is limited to the deformation of the fastener, it can be easily repaired simply by removing and replacing it.

Therefore, the damage situation can be easily investigated, and the repair work of the building can be performed efficiently and easily, and the restoration and reuse of the building can be made as early as possible.

Here, the fastener is an L-shaped metal fitting having a plate piece connected to the building structure side and a plate piece connected to the curtain wall side, and the fastener has the stress. The absorbing part can be formed as a cross-sectional defect formed in the metal fitting.

Further, as described in claim 3, it is preferable that the cross-section deficient portion is formed in a groove shape extending along the direction of the wall surface of the curtain wall in each of the two plate pieces of the L-shaped bracket.

Further, as set forth in claim 4, claim 2,
In 3, when the plate portion of the fastener connected to the building structure side is disposed so as to be vertically oriented, it is particularly excellent in absorbing horizontal displacement and suitable for adoption in a horizontal movement system.

On the other hand, as shown in claim 5, claim 2,
In 3, when the plate portion of the fastener coupled to the building structure side is arranged so as to be oriented in the horizontal direction, it is particularly excellent in absorbing vertical displacement, and is suitable for use in a rotating system.

[0019]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a main part of a mounting structure of a PC curtain wall according to an embodiment of the present invention, and shows a mounting portion corresponding to a lower right corner of the PC curtain wall as viewed from the inside of a building. Things. Here, even in the present embodiment, the PC curtain wall is generally mounted such that four bolts that are integrally erected at the four corners on the back surface are fastened to fasteners provided on the building structure side, respectively. The basic structure is almost the same as that of the prior art shown in FIG. 3 described above. In this example, an anchor bolt is used as the bolt, and the upper anchor bolt is provided on a beam (building structure) on an upper floor. The fastener is rigidly connected to the fastener and moves integrally. In the following description, the same members as those in the related art described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 2 is a PC curtain wall, and 4 is an anchor bolt (lower anchor bolt 4).
b) and 16 are mounting pedestals (building structure 6) integrally formed with the floor slab 14. As shown in the figure, the lower anchor bolts 4b are erected in a raised block 2b which protrudes in a box shape on the back surface of the concrete slab 2a of the PC curtain wall 2 and is integrally formed. A load receiving bolt 10 is provided on the lower surface of the raised block portion 2b.
Of the PC curtain wall 2 through the floor slab 14
It is supported on the side.

A mounting base 16 is integrally provided on the floor slab 14, and a primary fastener 20 is provided on the mounting base 16 so as to be integrated therewith. The primary fastener 20 is an L-shaped bracket, and the vertical side plate piece 20 a that stands upright in the vertical direction is directed in a direction perpendicular to the wall surface of the curtain wall 2.

A secondary fastener 22 is attached to the vertical side plate piece 20a of the primary fastener 20. The secondary fastener 22 is also connected to the building structure 6 (here, the above-described vertical plate 20a) side.
And a curtain side plate piece 22b joined to the PC curtain wall 2 side. The structure side plate piece 22a is sandwiched between the attachment plate 24 and the vertical side plate piece 20a and is attached and detached with bolts 26. It is fixed as possible.

The structure side plate portion 22a extends toward the PC curtain wall 2, and its extended end is bent at a right angle to be integrally formed as an L-shaped curtain side plate portion 22b. An insertion hole 9 for inserting a lower anchor bolt 4a erected on the raised block portion 2b of the PC curtain wall 2 is formed in the curtain side plate piece portion 22b so as to be long in the lateral direction. Bolt 4b
Is inserted and fixed with a nut so as to be relatively movable in the horizontal direction. A spacer 28 is engaged between the raised block 2b and the curtain-side plate piece 22b, and a predetermined space is provided between a portion near the root of the curtain-side plate piece 22b near the bent portion and the raised block 2b. Part is formed.

The secondary fastener 22 is attached to the secondary fastener 22 in accordance with the deformation of the building structure 6 due to an earthquake or the like.
When the force transmitted to the PC curtain wall 2 via the PC curtain wall 2 becomes excessive, the PC curtain wall 2 is provided with a stress absorbing portion which yields and deforms before the PC curtain wall 2 is damaged. The stress absorbing portion is constituted by a groove-shaped cross-section defect formed in the secondary fastener 22, and specifically, two plate pieces of the L-shaped metal fitting forming the secondary fastener 22, that is, a structure side plate piece The grooves 30 and 32 are formed on the side plate portion 22 b and the curtain side plate portion 22 b, respectively, and extend vertically along the wall surface direction of the PC curtain wall 2. The groove 30 on the structure side plate portion is located at a position close to the primary fastener 20. The groove 30 of the curtain side plate piece 22b is formed at a position close to the base of the bent portion.

Although not shown, a lower anchor bolt on the left side of the PC curtain wall 2 is also connected to the building structure via a primary fastener and a secondary fastener having the same configuration as in FIG. The upper anchor bolt has the same structure as that shown in FIG.
Although it is connected to the building structure side via the next fastener, in this embodiment, since the PC curtain wall 2 is horizontally moved integrally with the building structure on the upper floor side,
The insertion hole of the secondary fastener through which the upper anchor bolt is inserted is not formed as a long hole as a loose hole, but is formed as a tight hole in a perfect circle shape corresponding to the bolt diameter.

Therefore, in the PC curtain wall mounting structure as described above, if the interlayer displacement of the building vibration due to the earthquake falls within the initially assumed range, the PC curtain wall 2 is mounted similarly to the conventional case. Moves horizontally with the beam 12 of the building structure 6 on the upper floor, while the lower anchor bolt 4b slides horizontally in the elongated insertion hole 9 of the secondary fastener 22 to move the building structure on the lower floor. It is displaced relative to the body 6. For this reason, the interlayer displacement is absorbed and the PC curtain wall 2 is not transmitted with an excessive force to break it.

On the other hand, when a large earthquake occurs in which the interlayer displacement of the building vibration exceeds the range originally assumed, the interlayer displacement cannot be absorbed by the insertion hole 9 of the horizontally long loose hole. The side anchor bolt 4 b interferes with the secondary fastener 22 in the insertion hole 9. However, even if such interference causes a large force due to interlayer displacement to be transmitted to the PC curtain wall 2 via the primary and secondary fasteners 20 and 22,
Since the cross-section defect portion as the stress absorbing portion is formed in the groove shape in the next fastener 22, the secondary fastener 22 precedes yield deformation in the groove portions 30 and 32 before the PC curtain wall 2 is damaged. And bends, thereby absorbing the interlayer displacement.

As a result, it is possible to prevent a force enough to cause damage to the PC curtain wall 2 to be transmitted through the secondary fastener 22 as much as possible, and the PC curtain wall 2 is cracked in its concrete slab 2a. And breakage such as breakage of the anchor bolt 4 is prevented as much as possible.

When such a large earthquake occurs, before the PC curtain wall 2 is damaged, the PC curtain wall 2 must be removed.
Since the secondary fastener 22 yields and deforms in advance, and the rupture points concentrate on the secondary fastener 22, if the destruction state of the secondary fastener 22 is examined, it is determined whether the PC curtain wall 2 is damaged or not. It is possible to predict the state of the form and the like to some extent. If the damage is limited only to the yield deformation of the secondary fastener 22, it can be easily repaired simply by removing and replacing it.

Therefore, the damage situation can be easily investigated, and the repair work of the building can be performed efficiently and easily, so that the restoration and reuse of the building can be made as early as possible.

The embodiment of FIG. 1 described so far is
Although it is useful for the application to the horizontal movement method, when applied to the rotation method, the secondary fastener 22 shown in FIG. 1 is turned sideways by 90 degrees as shown in FIG. The primary fastener 20 is oriented by directing the portion 22a in the horizontal direction.
And the PC curtain wall 2. In this case, it is preferable to use an H-beam or an I-beam for the primary fastener 20.

[0033]

As described above in detail, according to the mounting structure of the PC curtain wall according to the present invention, even if a large deformation occurs in the building structure due to an earthquake or the like, each part of the PC curtain wall is damaged. First, the stress absorbing portion of the fastener first yields and deforms to absorb the force transmitted to the curtain wall, so that damage to the PC curtain wall can be prevented as much as possible.

In addition, it is possible to concentrate the rupture points due to the deformation of the building structure on the fastener, and it is possible not only to anticipate the form of the failure in advance but also to use the zipper when the PC curtain wall is damaged. Since the yield deformation has occurred, the damage state of the PC curtain wall can be predicted by first examining the damage state of the fastener. If the damage is limited to the deformation of the fastener, it can be easily repaired simply by removing and replacing it.

Accordingly, the damage situation can be easily investigated, and the repair work of the building can be performed efficiently and easily, and the restoration and reuse of the building can be made as early as possible.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a main part of an embodiment of a mounting structure of a PC curtain wall according to the present invention.

FIG. 2 is a partial perspective view showing a main part of another embodiment of the mounting structure of the PC curtain wall according to the present invention.

FIG. 3 is a cross-sectional view showing a conventional PC curtain wall mounting structure.

FIG. 4 is a view schematically illustrating two methods, a horizontal movement (sway) method and a rotation (locking) method, which are conventionally adopted as a mounting method for absorbing interlayer displacement.

[Explanation of symbols]

2 PC curtain wall 4 Anchor bolt 4a Upper anchor bolt 4b Lower anchor bolt 6 Building structure 8 Fastener 9 Insertion hole 10 Load receiving bolt 12 Beam 14 Slab 16 Mounting pedestal 20 Primary fastener 22 Secondary fastener 22a Structure side plate Part 22b Curtain side plate piece part 24 Attached plate 28 Spacer 30, 32 Groove (stress absorbing part) as cross-section defective part

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Masataka Sekine 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (58) Field surveyed (Int. Cl. ⁷ , DB name) E04B 2 / 56-2/70 E04B 2/88-2/96 E04F 13/08-13/18

Claims (5)

(57) [Claims] 1. A mounting structure for a precast concrete curtain wall, wherein bolts integrally erected on the back surface of a precast concrete curtain wall are fastened and fixed to fasteners provided on the building structure side, wherein the fastener is attached to the building structure. The fastener is detachably fixed to the fastener wall, and when the force transmitted to the precast concrete curtain wall via the fastener becomes excessive due to the deformation of the building structure, the curtain wall may be damaged. A mounting structure for a precast concrete curtain wall, wherein a stress absorbing portion which yields and deforms in advance is provided. 2. The fastener according to claim 1, wherein the fastener comprises an L-shaped fitting having a plate piece connected to the building structure and a plate piece connected to the curtain wall, and the stress absorbing portion is formed in the metal fitting. The mounting structure for a precast concrete curtain wall according to claim 1, wherein the mounting structure comprises a cut-out portion having a cross section. 3. The cross-section-deficient portion is formed in a groove shape extending along a wall surface direction of a curtain wall in each of two plate pieces of an L-shaped bracket.
The mounting structure of the described precast concrete curtain wall. 4. A mounting structure for a precast concrete curtain wall according to claim 2, wherein a plate piece portion connected to the building structure side of the fastener is arranged so as to be vertically oriented. 5. The mounting structure for a precast concrete curtain wall according to claim 2, wherein a plate portion connected to the fastener on the building structure side is arranged in a horizontal direction.