JPH0663300B2 - Steel frame type curtain wall and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steel frame type curtain wall as an exterior material of a building and a method for manufacturing the same.

[Conventional technology]

Recently, attempts have been made to use fiber-reinforced concrete panels as curtain walls for building exterior materials. in this case,
In order to secure dimensional stability, it is essential to perform autoclave curing at a maximum temperature of 180 ° C (about 10 atm). In addition, a metal frame is connected to the back of the panel in order to secure the strength of the concrete panel and to easily attach it to the building skeleton material, but it is necessary to use a connection method that absorbs the contraction and bending of concrete. Flexible anchors were used for.

[Problems to be solved by the invention]

When autoclave curing is performed, when stone materials are used for decorative finish, strength deterioration and discoloration often occur in the main stone and discoloration in the raster tile. Therefore, it was difficult to manufacture an FRC curtain wall product with a stone finish. On the other hand, on the other hand, there is no autoclave curing equipment, and there is a disadvantage in terms of transportation cost because it cannot be manufactured near the site.

Further, in the conventional product, the joining method of absorbing the shrinkage of the FRC panel with the metal frame has to be adopted, which makes it difficult to directly apply the strength of the metal frame to the FRC panel. .

The present invention is intended to solve such a problem, and has established a technique for producing a curtain wall made of fiber reinforced concrete panels without autoclave curing, and by devising the curtain wall production, high strength and low strength are achieved. The purpose is to provide an FRC curtain wall capable of shrinking stone materials.

[Means for solving problems]

According to the present invention, there is provided a steam frame type curtain wall in which a framed steel frame is directly connected to an underside of a fiber reinforced concrete panel cured by using low shrinkage and low alkali cement by using an anchor.
The steam frame curtain wall according to the present invention comprises:
Set the steel frame to which the anchor is attached in advance on the formwork for the panel, and place the fiber-reinforced concrete that does not solidify yet with low shrinkage and low alkali cement in the formwork so that the anchor is embedded in the concrete. It is advantageously manufactured by casting and curing without autoclave curing. At that time, an anchor consisting of an insert embedded in the panel side and a bolt screwed into this insert is used, and the bolt embedded in the panel is screwed through the bolt hole of the steel frame. Good to wear.

In particular, the present invention can provide a steel frame type FRC curtain wall with a stone decorative finish. In this case,
Set the steel frame and the stone material with the anchors attached to the panel formwork in advance, and add the fiber-reinforced concrete that does not solidify yet using the low shrinkage / low alkali concrete so that the anchors are embedded in the concrete. It is placed inside and cured without autoclave curing. As a result, a high-strength decorative curtain wall is provided in which a framed steel frame is directly connected to the back surface of a fiber reinforced concrete panel having a stone decorative surface on its front surface by using anchors. In addition, FRC
Further strength can be secured by arranging mesh reinforcements in the panel substantially parallel to the panel surface and locking the anchors to the mesh reinforcements.

As the reinforcing fibers used in the present invention, carbon fibers, metal fibers such as stainless fibers, synthetic fibers such as aramid fibers and vinylon fibers are suitable. The low shrinkage / low alkali cement used in the present invention is, for example, the chemical composition of SiO ₂ : 22 to 24%, Al ₂ O ₃ : 10 to 12.
%, Fe ₂ O ₃ : 0.5 to 2%, CaO: 45 to 52%, SO ₂ : 7 to 10%
There is one. As the aggregate to be mixed, it is recommended to use powdered silica or silasburn. If necessary, thickening agents, defoaming agents, and coagulation regulators may be used for steam curing at around 40 ° C.

Furthermore, especially when concrete reinforced with conductive fibers is used, a local battery is formed at the portion where the conductive fiber and the surface of the metal embedded in the concrete come into contact, and this local battery action causes corrosion of the metal. Therefore, it is preferable to provide an insulating layer that cuts off the direct contact between the conductive fiber and the metal because it may accelerate the process. In practice, it is better to coat the metal surface with an insulating layer having an electric resistance of 100Ω or more.

Examples of the drawings will be described below.

〔Example〕

FIG. 1 is a view of the entire steel frame type FRC curtain wall of the present invention seen from the back side, FIG.
The figure is an enlarged cutaway view of the portion A in FIG. In the figure, 1
Indicates a square FRC panel, and 2 indicates a framed steel frame. The FRC panel 1 has a side edge portion 3 protruding at the same height on the back surface side at its peripheral edge, and a steel frame 2 is directly connected to the back surface of the panel surrounded by the side edge portion 3. In the illustrated example, the steel frame 2 uses a cross-section type steel, but instead of this type, a working type or L type is used.
A mold or a mouth-shaped one may be used. In any case, the steel frame 2 is directly connected to the back surface of the FRC panel 1 by using the anchor member 4 (that is, the two are in contact with each other instead of being attached separately),
And it is framed in a predetermined shape. In the illustrated example, this frame is composed of a rectangular main frame and a plurality of (two in the vertical direction in the figure) auxiliary bars stretched in the main frame,
The rectangular main frame is sized to fit inside the side edge 3 at a slight distance.

FIG. 3 shows a connection structure of the present invention for directly connecting the steel frame 2 to the FRC panel 1 by using the anchor member 4. The anchor member 4 is composed of an insert 5 embedded on the FRC panel 1 side and an anchor bolt 8 screwed to the insert 5. As shown in FIG. 4, the insert 5 is composed of a tubular body 6 having an internal thread on the inner wall thereof and a projecting member 7 projecting from the tubular body 6 in a direction perpendicular to the axis thereof. A rod having a predetermined length is used as this, and this rod is joined to the bottom portion of the tubular body 6 by welding at approximately the center thereof to form an inverted T type insert. Insert this insert 5 as shown in FIG.
It is embedded in the RC panel 1 so that the upper edge of the tubular body 6 is aligned with the surface of the panel 1, the anchor bolt 8 is passed through the bolt hole 9 provided in the steel frame 2, and the washer is also used.
The steel frame 2 is directly joined to the FRC panel 1 by screwing the female screw of the tubular body 6 through 10. At that time, a mesh streak 11 is embedded in the FRC panel 1 in parallel with the panel surface, and the protruding member 7 of the insert 5 is locked to the mesh streak 11. Further, the bolt hole 9 provided in the steel frame 2 may be made slightly larger than the diameter of the bolt 8 to allow the unavoidable contraction of the panel 1.

When joining the steel frame 2 and the FRC panel 1, the insert 5 to be embedded in the panel is attached to the steel frame 2 in advance, and the steel frame 2 with the insert 5 is not set yet after being set in the mold. It is advantageous to adopt the prescription of driving the FRC. This manufacturing method will be described below with reference to FIGS. 5 and 6.

First, as shown in FIG. 5, a rectangular outer mold 14 having an upper surface and a lower surface opened and an inner mold 15 having a smaller diameter than this are formed on a mold base 13.
Set. Inner mold 15 is a base with a gap corresponding to the panel thickness
It is opened and set between 13 and outer mold 14 and inner mold 15
The gap between and is the side edge 3 of the peripheral edge of the panel (see FIGS. 1-2).
It becomes the casting space that forms the. On the other hand, the preassembled steel frame 2 is set in the inner mold 15. At that time, the anchor member 4 is attached to the steel frame 2 in advance.
That is, as described with reference to FIGS. 3 to 4, by inserting the anchor bolt 8 into the bolt hole 9 of the steel frame 2 via the washer 10 and screwing the female screw of the cylindrical body of the insert 5 into the bolt 8. With the insert 5 preliminarily attached to the steel frame 2, the steel frame 2 is set to the mold at a position where it is embedded in the FRC in which the insert 5 is placed. When this set is completed, the FRC 16 which is not yet set is placed as shown in FIG. As a result, the steel frame 2 and the FRC are joined together with the insert embedded. Curing is performed in an integrated state with the steel frame 2, and at that time, steel curing is performed without autoclave curing.

Fig. 7 shows FRC after stone 17 is laid on base 13.
6 shows a state similar to that of FIG. The stone material 17 is processed into a thin plate as shown in FIGS. 8 to 9, and an example in which a coil spring anchor 18 is attached to the back surface thereof is shown. That is, the double hole type anchor 18 is inserted into the inclined hole 19 provided on the back surface of the stone material 17 and locked by utilizing elasticity. At that time, the inclined hole 19 may be filled with an adhesive. When CFRC (carbon fiber reinforced concrete) is used as the FRC, it is preferable to interpose an insulating sheet on the back surface of the stone material 17. A vinyl sheet is suitable as this insulating sheet. In the present invention, since the FRC panel is cured without autoclave curing, strength deterioration or discoloration can be avoided even if the main stone (granite) or the raster tile is used as the stone material 17. Further, an insulating resin coat, for example, an epoxy resin coat is preferably applied to a portion where the insert, the fastener, and the steel frame are in contact with CFRC.

An example of fabrication using CFRC is given below.

Tables 1 to 3 show the properties of the carbon fibers, cement and aggregate used. Further, Table 4 shows the formulation of CFRC. The CFRC kneading was performed using an omni mixer. As shown in Figure 8, stone 17 (granite: thickness 25 mm,
Double spring type anchor 18 was attached to the surface (polished finish), and it was clamped in the form as shown in Fig. 7, and Hamaite (Y-1700) and silica sand No. 3 were used as the back surface treatment.
In addition, hamatite (NA-14) was used as a filling material for stone joints. Then, as shown in FIG. 7, the steel frame 2 to which the anchor member 4 was attached was set and CFRC was placed. The steel frame used SS41 steel. In addition,
Mesh reinforcements with a diameter of 5 mm and a pitch of 100 x 100 mm are arranged in the panel, and as shown in Fig. 3, the protruding member 7 of the anchor 5 is provided.
Was sunk under the mesh and locked. CFRC
The casting was performed using a hopper, and the curing was performed by steam curing at a maximum temperature of 40 ° C for 17 hours, and then as secondary curing by hanging a sheet outdoors until the age of 7 days and allowing it to stand still.

The obtained curtain wall was exposed vertically to the outside and exposed to the outdoors to measure the warpage and observe the appearance. Deformation rate after 12 months = total length of curtain wall (l)
The ratio of the amount of deformation (δ) in the central part to δ = δ / l was used as a measure of warpage, and the deformation rate was 1/1593 or less. In addition, even after these 12 months of exposure, no cracks, stains or stains on the main stone were found.

Also, this real stone driven CFRC curtain wall (panel area: 2744 mm × 1723 mm, main stone thickness: 25 mm, CFRC
An out-of-plane deformation experiment with a thickness of 60 mm was performed. Test is age 45
An evenly distributed load due to water pressure was applied during the day. A load of 170 kgf / m ^{2 of the} specimen excluding the steel frame was always applied to the specimen, and the displacement of the center of the specimen was examined. The results are shown in the load-displacement curve in FIG. This curtain wall displacement in the central portion of the specimen with respect to the design wind load P _{w =} 440kgf / m ² as used in the supposed height 35.7m is 1.31 mm, the _{3.0 × P w 4.98mm, 3.4 ×} P w Then
It was 5.72 mm, and the residual displacement after the experiment was 0.42 mm. Therefore, this sample exhibited the characteristics of being highly elastic and having a large restoring force. FIG. 11 shows the load-strain curve of the test, and Table 5 shows the strain degree of each material. As can be seen from these results, the strain degree of each material was sufficiently smaller than that at the yield (proportional limit) even under the maximum load (3.4 × P _w ). Also, in this test, the main stone surface (surface)
There was no cracking on both the CFRC surface (rear surface), no cracks were found due to edge cutting at the stone-joint material, and the main stone-CFRC interface, and no abnormalities were found in the steel frame and anchor members. . Therefore, it was confirmed that this steel frame type curtain wall is sufficiently safe as a building material.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an example of a steel frame type curtain wall according to the present invention as seen from the back side, FIG. 2 is an enlarged cutaway perspective view of portion A of FIG. 1, and FIG. Is a schematic sectional view showing a state in which a steel frame and an FRC panel are joined using an anchor according to the present invention, FIG. 4 is a perspective view of an insert portion of the anchor, and FIG. 5 is a steel frame type curtain wall according to the present invention. Fig. 6 is a cross-sectional view showing the set state of the form and steel frame before the FRC is placed during the manufacturing of the steel, Fig. 6 is a cross-sectional view showing the state of the FRC placed from the set state of Fig. 5, and Fig. 7 is a stone 6 is a sectional view similar to FIG. 6 when manufacturing a finished steel frame type curtain wall according to the present invention, FIG. 8 is a sectional view showing an example of stone material used in FIG. 7, and FIG. 9 is FIG. Of stone FIG. 10 is a plan view, FIG. 10 is a load-displacement curve diagram when a curtain wall manufactured according to the present invention is tested, and FIG. 11 is a load-strain curve diagram when a curtain wall manufactured according to the present invention is tested. 1 …… FRC panel, 2 …… Steel frame, 3 ……
Side edge of FRC panel, 4 ... Anchor member, 5 ... Insert, 6 ... Female threaded cylinder, 7 ... Projecting member, 8
…… Anchor bolts, 9 …… Bolt holes in steel frame, 10 …… washers, 11 …… Mesh streaks.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroaki Nakagawa Inventor Hiroaki Nakagawa 2-191-1 Tobita-cho, Chofu-shi, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Keiichi Taniguchi 2-1-11-1 Tobita, Chofu-shi, Tokyo No. 56 Kashima Construction Co., Ltd. Technical Research Institute (56) Reference Japanese Patent Laid-Open No. 63-304856 (JP, A) Actual Opening Sho 54-20514 (JP, U) Actual Opening Sho 63-59921 (JP, U) Actual Opening Sho 63 -51013 (JP, U) Special table Sho 57-501737 (JP, A)

Claims (6)

[Claims] 1. A surface of a fiber reinforced concrete panel using low shrinkage and low alkali cement is provided with a tile finish, a stone finish or a pseudo stone finish, and a framed steel frame is provided on the back surface of the panel. A steel frame type curtain wall that is directly connected using an anchor. 2. The curtain wall according to claim 1, wherein the metal embedded in or in contact with the fiber reinforced concrete is coated with an insulating layer having an electric resistance of at least 100 Ω on the surface in contact with the concrete. 3. A steel frame to which an anchor is previously attached is set in a panel formwork, and a fiber-reinforced concrete which is not yet solidified using low shrinkage and low alkali cement is embedded in the concrete. A method for producing a steel frame type curtain wall, which comprises setting in a mold and curing without autoclave curing. 4. A steel frame to which an anchor is attached in advance and a decorative material are set on a frame for a panel, and the shrinkage is low.
A steel frame mold characterized in that a fiber-reinforced concrete that does not solidify yet is cast in a low-alkali cement into the mold so that the anchor is embedded in the concrete, and is cured without autoclave curing. Curtain wall manufacturing method. 5. The method according to claim 3, wherein the mesh reinforcements are arranged substantially parallel to the panel surface in the cast concrete. 6. The method according to claim 3, 4 or 5, wherein the metal to be buried or contacted with the concrete to be poured is covered with an insulating layer having an electric resistance of at least 100 Ω or more on the surface before casting. Manufacturing method.