JPH084318A - Repairing method of curtain wall and bearing device used therefor - Google Patents

Abstract

PURPOSE:To increase bearing capacity of a bracket for bearing a new curtain wall in the case the new curtain wall is installed to an outdoor side of the existing curtain wall. CONSTITUTION:An opening 11 is formed in the existing exterior walling 1 forming the existing curtain wall, a bracket 3 and a fastener 4 are projected from the opening 11 an outdoor side of a beam 2, and in a method for installing a new curtain wall to an outdoor side of the existing exterior walling 1, the bracket 3 lower than the beam depth is detailed between both upper and lower flanges 21 and 22. The bracket 3 is mounted on the lower flange 22 of the beam 2 in a state to constrain the movement to the beam 2 side and is fixed to the beam 2, and the fastener 4 passing through the opening 11 of the existing exterior walling 1 is fixed to an outdoor side of the bracket 3. A mullion 5 is connected to the fastener 4, and a new exterior walling 6 is borne on the mullion 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curtain wall repairing method for newly constructing a curtain wall while leaving an existing curtain wall, and a supporting device used therefor.

[0002]

2. Description of the Related Art A method for newly constructing a curtain wall on the outside of an existing curtain wall supported by a skeleton while leaving an existing curtain wall is disclosed in Japanese Patent Laid-Open No. HEI-2.
-Part of the existing outer wall material that constitutes the curtain wall like No. 70866 is partially cut out at a position corresponding to the beam of the frame, and a bracket or the like is projected from the notch to the outdoor side of the beam to remove the existing outer wall material. This is done by joining the bracket to the bracket on the outdoor side and supporting the new outer wall material on this bracket.

In this example, an anchor bolt penetrating a beam is embedded in a slab, and a bracket is fixed to the anchor bolt. The vertical load of the upright joined to the bracket and the new outer wall material is the shear strength of the anchor bolt. Alternatively, since the frictional force between the bracket and the web of the beam is transmitted to the beam, there is a limit to the load of the new curtain wall that the bracket can support.

In addition, a moment due to the vertical load of the erection and the new outer wall material acts on the joint between the bracket and the beam around the lower end of the bracket, but the stability of the bracket against the moment is uncertain because it is supported only by the anchor bolts. In addition, since the bracket is joined to the beam web, the arm length of the moment is large, and the moment is resisted by the axial force of the anchor bolt, so that the moment is in a disadvantageous supporting state.

The present invention has been made by paying attention to the weak points of the above-mentioned conventional method, and proposes a repairing method and a supporting device for a structure having a high bracket supporting ability.

[0006]

According to the present invention, a bracket mounted on a lower flange of a beam is fixed to the beam between the upper and lower flanges so that the vertical load of the upright supported by the bracket and the new outer wall material is supported by the beam. Directly to the bracket to enhance the support capability of the bracket, shorten the length of the fastener that supports the new curtain wall, and reduce the moment at the joint between the fastener and the bracket.

The height of the bracket is smaller than that of the beam, and the bracket is placed between the upper flange and the lower flange, and is placed on the lower flange of the beam and fixed to the beam while the movement toward the beam is restricted. On the outdoor side of the bracket, a cuboid that penetrates the opening of the existing outer wall material and constitutes the new curtain wall and a fastener that supports the new outer wall material are fixed.

Since the bracket is fixed to the beam while being sandwiched between the upper and lower flanges of the beam, the vertical load of the new vertical outer wall material is directly transmitted from the lower flange to the beam, and the bracket is extended to the beam side. By fixing the movement in a restrained state, the positive and negative wind pressure applied to the new outer wall material is also transmitted to the beam. The transmission of wind pressure to the beam by restraining the movement of the bracket to the beam side is performed by a wind pressure receiver fixed to the web of the beam and integrated with the bracket.

The bracket is also secured to the beam while abutting both the upper and lower flanges to ensure stability against moments.

Further, since the bracket is located between the upper and lower flanges of the beam and the fastener is joined to the bracket, the extension length of the fastener from the beam (the moment arm is larger than that when the fastener is joined to the web of the beam). (Length) is shortened, and the moment at the joint between the fastener and the bracket is reduced.

The bracket and the fastener integrated with the wind pressure receiver constitute a support device for supporting the upright and the new outer wall material on the beam.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 forms an opening 11 as shown in FIGS. 1 and 5 in an existing outer wall material 1 which constitutes an existing curtain wall and is supported by a skeleton. This is a method of projecting a bracket 3 and a fastener 4 on the outdoor side, and installing a cuboid 5 and a new external wall material 6 forming a new curtain wall on the outdoor side of the existing outer wall material 1 to repair the curtain wall.

The opening 11 is formed by partially cutting out the position of the existing outer wall member 1 corresponding to the beam 2 by a size such that the bracket 3 can be inserted.

The bracket 3 has a height such that it can be accommodated between the upper and lower flanges 21 and 22 of the beam 2 and is mounted on the lower flange 22. Beam 2 is on top of bracket 3
A gap adjusting bolt 31 that abuts on the upper flange 21 of the above and fills the gap between the bracket 3 and the beam 2 which is different depending on the beam formation is screwed in.
The gap adjustment bolt 31 hits the upper flange 21 in a state where it is housed between 1 and 22, and the movement in the height direction is restricted, so that the bracket 5 supports the upright 5 and the new outer wall material 6 which are supported vertically through the fastener 4. The load is transferred from the lower flange 22 directly to the beam 2. Since the bracket 3 is restrained from moving in the height direction by the clearance adjusting bolt 31, the stability of the bracket 5 against the moment due to the vertical load of the upright 5 and the new outer wall member 6 is high.

The bracket 3 is also fixed to the wind pressure receiver 7 which is fixed to the outside of the web 23 of the beam 2, and the new outer wall member 6 is provided.
The out-of-plane movement is restricted, and the positive and negative wind pressure received by the new outer wall member 6 is transmitted from the web 23 to the beam 2.

The fastener 4 penetrates through the opening 11 of the existing outer wall material 1 and is fixed to the mounting piece 32 of the bracket 3 facing the outdoor side with bolts 8 so that the end of the outdoor side projects from the existing outer wall material 1 to the outdoor side. To do. Since the moment due to the vertical load of the upright 5 and the new outer wall material 6 acts on the joint portion of the fastener 4 with the bracket 3, the fastener 4 is joined in the height direction with two bolts 8, 8 in the embodiment. ing.

The support device according to the second aspect of the present invention is a wind pressure receiver 7
The bracket 3 and the fastener 4 integrated with each other are used to support the upright 5 and the new outer wall member 6 on the beam 2.

After the fastener 4 is joined to the bracket 3, the upright 5 is joined to the fastener 4 so that the new outer wall material 6 is supported by the upright 5, and the repair work is completed.

FIGS. 1 and 2 show an embodiment in which the bracket 3 is made of a single material. However, when the beam formation is particularly large, as shown in FIGS. The bracket 3 is composed of two unit members 30, 30 whose height as the bracket 3 can be set at the position. In this case, the two unit members 30 and 30 are joined to each other with the height of the bracket 3 adjusted, and fixed to the beam 2 by the gap adjusting bolt 31 and the wind pressure receiver 7 as in the case of FIG.

[0020]

As described above, the present invention is a method of fixing a bracket on the lower flange of the beam to the beam between the upper and lower flanges. And, the vertical load of the new outer wall material can be directly transmitted to the beam, and the support capacity of the bracket can be enhanced. In particular, since the bracket is fixed to the beam while hitting both the upper flange and the lower flange, the stability against the moment in the fixed state is high.

Further, the bracket is located between the upper and lower flanges of the beam, and as a result of the fastener being joined to the bracket, the protrusion length of the fastener from the beam (the length of the arm of the moment is longer than that when the fastener is joined to the web of the beam). Is shortened, and the moment at the joint between the fastener and the bracket can be reduced.

Further, since the bracket is fixed while being restrained from moving toward the beam, positive and negative wind pressure received by the new outer wall material is also transmitted to the beam.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a relationship between an existing outer wall material and a new outer wall material.

2 is a cross-sectional view of FIG.

FIG. 3 is a vertical cross-sectional view showing the relationship between an existing outer wall material and a new outer wall material when the beam formation is large.

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is an elevation view showing a formation position of an opening in an existing outer wall material.

[Explanation of symbols]

1 …… Existing outer wall material, 11 …… Opening, 2 …… Beam, 21 …… Upper flange, 22 …… Lower flange, 23 …… Web, 3 ……
Bracket, 30 …… Unit member, 31 …… Gap adjustment bolt,
32 …… Mounting piece, 4 …… Zipper, 5 …… Square, 6 ……
New outer wall material, 7 ... Wind pressure receiver, 8 ... Bolt.

Claims (2)

[Claims] 1. An opening 11 is formed by partially cutting out a position corresponding to a beam 2 of a frame of an existing outer wall material 1 which constitutes a curtain wall and is supported by the frame, and an opening 11 is formed from this opening 11. This is a method of repairing a curtain wall in which a bracket 3 and a fastener 4 are provided on the outside of the room, and a vertical 5 and a new outside wall material 6 are newly installed on the outside of the existing exterior wall material 1, which is a bracket having a height smaller than that of the beam. 3 is housed between the upper flange 21 and the lower flange 22, and is placed on the lower flange 22 of the beam 2 while being restrained from moving toward the beam 2 and fixed to the beam 2. 1. A method of repairing a curtain wall, in which a fastener 4 penetrating the opening 11 of 1 is fixed, and a stile 5 is joined to the fastener 4 to support the new outer wall material 6 on the sill 5. 2. A device for supporting the upright 5 and the new outer wall member 6 on the beam 2 by the method according to claim 1, which is housed between the upper flange 21 and the lower flange 22 of the beam 2 and is in contact with both of them. A fastener fixed to the beam 2 and having a wind pressure receiver 7 fixed to the outdoor side of the web 23 of the beam 2 and a bracket 3 penetrating through the opening 11 of the existing outer wall material 1 and fixed to the outdoor side of the bracket 3. Support device consisting of 4.