JP3429433B2 - Prevention structure of cold bridge in steel frame building - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold bridge prevention structure in a steel frame building. Specifically, it is intended to prevent cold bridges from the outer wall panels to the beams and from the roof concrete floor to the beams in the external heat insulation building in which the cement plate outer wall panels are stretched over the steel structure. .

[0002]

2. Description of the Related Art In a steel-framed building, the fixing of the finishing material and the steel frame is limited to columns, beams, furring strips, etc.
Since the thermal conductivity of iron is much higher than that of concrete, the steel frame structure is susceptible to cold bridge action from outside (cooling heat conduction action of external cold air), and the cold bridge action causes dew condensation on the steel beams and columns. As a result, the rust corrosion of the steel aggregate is caused, and the aggregate of the building is partially weakened, and there is a risk that the strength as originally designed cannot be guaranteed.

Therefore, in steel frame construction, in order to prevent dew condensation due to the cold bridge action on the iron columns and beams, the outer wall material for the outer heat insulation structure is the outer skin material of the steel sheet and the inner skin. Isoband (trade name) in which a rigid urethane foam is interposed between the materials is used as the outer wall material.
However, since this isoband also causes a cold bridge at the portion where it is attached to the steel aggregate, it is inferior in fire resistance to extruded cement boards and lightweight cellular concrete panels (ALC panels), etc., and the interior finish for living is complicated. , It is commonly used as an outer wall material for outer insulation in warehouses and factories.

As shown in FIG. 4, in the floors of the second floor and above of an outer heat-insulated steel frame building using a conventional extruded cement board as an outer wall material, as shown in FIG. Was fixed by welding, the concrete stopper 12 was fixed to the end on the beam 10, the concrete floor 13 was placed on the deck plate 11, and then the upper Z clip 21 and the lower Z clip (not shown) were attached. Cement board 1,
The through-wall steel materials 15 for Z-clip locking (for lower Z-clip not shown) welded to the beam 10 one by one are sequentially engaged and fixed to form an outer wall.

Rock wool 14 is sprayed on the exposed portion of the steel material of the steel frame to provide a fireproof coating, and a hard urethane foam 26 is sprayed from the inner surface side to the cement plate 1 to form a heat insulating layer. Sealing 2 between the upper and lower cement boards 1
No. 7 was applied, the base for the interior plate and the ceiling base were arranged, and the interior plate 7'and the ceiling plate were attached.

Further, in the beam portion on the uppermost floor, that is, the roof concrete portion, as shown in FIG. 5, the cement plate 1 is engaged and fixed to the beam 10 by the Z clip 21 and the rock wool 14 is exposed on the exposed portion of the iron material. After spraying, the hard urethane foam 26 is sprayed on the inner surface of the cement board 1 to form a heat insulating layer, and the hard urethane foam 26 is sprayed on the lower surface of the roof concrete floor 13 'to form a heat insulating layer. An asphalt-exposed waterproof sheet 18 was stretched on the upper surface of the roof concrete 13 ', and the end of the waterproof sheet was fixed to the cement board 1 with a headstock 20.

[0007]

In the concrete floor 13 portion of each floor above the second floor shown in FIG. 4, the back side of the beams 10 and columns (not shown) is a rigid urethane foam on the inner surface of the cement board 1. 26 cannot be sprayed. Therefore, the cold heat T ₁ due to the external cold air to the cement plate 1 causes a cold bridge action from the cement plate 1 to the beam 10 or the pillar, and the condensation d ₁ generated by the cold bridge is generated. Causes rust corrosion on beams 10 and columns.

Further, the roof concrete floor 1 shown in FIG.
In the 3'portion, the hard urethane foam 26 cannot be sprayed onto the cement plate 1 on the back side of the beam 10 as well.
The hard urethane foam 26 cannot be sprayed onto the lower surface of the roof concrete floor 13 'located on the back side of the beam 10.

Therefore, to the back side of the beam 10, the cold heat T ₁ due to the cold bridge action from the cement plate 1 and the cold heat T ₂ due to the cold bridge action from the end portion of the roof concrete floor 13 'are transmitted and condensed. d ₁ and d ₂ are generated, which also causes rust corrosion on the beam 10.

In a steel frame structure, the beam 10 is joined to each iron material, and the iron material is concrete.
Since it has nine times the thermal conductivity, the cold bridge action on the beam 10 causes dew condensation in various places in the building and also causes mold to deteriorate the habitability. The present invention is intended to prevent such a cold bridge action on a beam, prevent partial weakening of the steel aggregate due to rust corrosion, and maintain the service life of the steel frame building as designed.

At least an upper frame 2 and a lower frame 4 are provided, and a cement plate 1, a synthetic resin foam heat insulating layer 6 and an interior plate 7 are provided.
Using the composite panel W laminated and integrated by coagulation and adhesion of the heat insulating layer 6 of synthetic resin foam as the outer wall material, the upper frame 2 and the lower frame 4 are stretched on the beam 10 by the mounting hardware 33, 33 ', 38, and An insulating layer 16 of synthetic resin molded foam is stretched over the entire upper surface of the roof concrete floor 13 'to form a composite panel W.
Hard urethane foam 26 is used for the upper and lower panel spacing.
And only field spraying, the upper frame 2 of the composite panel W top and spacing the extrusion foaming port of the heat insulating layer 16 on the roof concrete floor 13 '
The polystyrene plate 17 is placed, the upper surface of the heat insulating layer 16 is covered with the waterproof layer 18, and the cement board 1 of the composite panel W is
Also, the cold heat transfer by the external cold air from the roof concrete floor 13 'to the beam 10 is blocked. The “cement board” in the present invention means an extrusion-molded cement board or a lightweight aerated concrete board (ALC panel).

Since the upper frame 2 and the lower frame 4 of the composite panel having the heat insulating layer 6 are mounted on the beam 10 by the mounting hardware, the panel can be easily mounted without damage. Moreover, the building has the heat insulating layer 6 on the back side of the beams and columns, and the heat insulating layer 16 also on the entire upper surface of the roof concrete floor 13 '. And, spraying on site in the vertical interval of the composite panel W
Extruded expanded polystyrene foam 17 exists between the upper part of the upper frame 2 of the panel and the heat insulating layer 16 on the roof concrete floor 13 ′, where the hard urethane foam 26 is crushed.
Therefore, the cement board 1 and the roof concrete floor 13 '
The cold bridge effect on the beam 10 is prevented, the dew condensation and the rust corrosion on the beam 10 are prevented, and the mold formation due to the cold bridge effect from the outer wall in the building can be prevented. Moreover, since the panel also has the interior plate 7, the construction for tensioning the interior plate after forming the outer wall is not necessary.

In addition, since the cement board 1 and the interior board 7 of the composite panel W are integrated by solidifying and adhering the synthetic resin foam as the heat insulating layer 6, the space between the layers can be obtained only by injecting the synthetic resin foam. Lamination adhesion can be achieved without gaps, and the panel W can be easily and uniformly manufactured in the factory.
Moreover, since the heat insulating layer 6 is covered and protected by the upper and lower frames and the interior plate 7, damage to the synthetic resin foam having low mechanical strength can be avoided.

Further, the composite panel W can be adjusted with respect to both the panel W and the beam 10 by the upper mounting hardware 33, 33.
'And the lower mounting hardware 38 adjustable to the beam
Since the upper frame 2 and the beam 10 are attached to the beam 10 so as to be slidable relative to each other, the panel W is not damaged even when the beam sways due to an earthquake or the like , and the mounting position of each mounting metal object can be adjusted.
It can be installed easily and evenly.

Further, the heat insulating layer 16 is stretched over the entire upper surface of the roof concrete floor 13 ', and as shown in FIG. 2 (B), it is extruded into the space between the upper part of the panel upper frame 2 and the heat insulating layer 16.
Since the cold heat transfer from the roof concrete floor 13 ′ to the beam 10 was also blocked by interposing the foam polystyrene foam 17, the concrete floor 13 ′ from the vicinity of the boundary with the composite panel W of the roof concrete floor 13 ′ and the cement board of the panel. Cold bridges via route 1 can also be prevented.

Further, since the heat insulating layer 16 on the upper surface of the roof concrete floor 13 'is a synthetic resin foam plate, it can be rationally produced in the factory, and the waterproof layer 18 is provided on the upper surface.
High thermal insulation performance can be maintained for a long time.

Therefore, a composite panel W in which the cement board 1, the synthetic resin foam heat insulating layer 6 and the interior board 7 are laminated and integrated by coagulation adhesion of the synthetic resin foam heat insulating layer is stretched on the beam as an outer wall material. At the same time, a heat insulation layer 16 is stretched over the entire upper surface of the roof concrete floor 13 ', and further, a hard urethane foam 26 is provided in the space between the upper and lower composite panels, and the upper frame 2 of the panel W and the heat insulation layer 16 on the roof concrete floor. Since the extruded expanded polystyrene foam 17 is present in the interval between
An advantageous steel frame that can prevent cold heat transfer from the cement board 1 to the back side of the beam 10 as well as cold heat transfer from the end of the roof concrete floor 13 'to the back side of the beam 10 or the pillar, and prevent cold bridge action from the outside air. A built structure is obtained.

[0018]

EXAMPLES [Composite Panel W] As shown in FIG. 3, three extruded cement boards 1 having a width of 600 mm, a length of 2800 mm, and a thickness of 60 mm, which are used as conventional outer wall materials, are arranged side by side in a factory, and are angled. The upper frame 2, both side frames 3 and the lower frame 4 made of steel (equal angle steel) are in a form in which one side of the upper frame and both side frames stands vertically from the cement plate 1, and the lower frame 4 has one side of the cement plate 1. Welded in a downward facing configuration to support the lower edge.

Also, an angle steel piece 19 is attached to the lower frame 4.
Was used to weld a steel plate 5 vertically from the cement plate 1 to form a form, and the form was placed on the parallel cement plate 1. Further, the Z clips 21 are vertically attached to the cement plate 1 as in the conventional case, and the Z clips 21 are locked to the horizontal sides of the upper frame 2 and the lower frame 4 to attach the cement plate to the mold body. The upper frame 2 is L (30
mm) lower.

Further, the upper frame 2, the steel plate 5 and the angle steel piece 1
A bolt hole 8 was drilled in the overlapping portion of 9 and a nut 9 was welded and fixed to the inside of the mold body. Next, a 12.5 mm-thick gypsum board as the interior plate 7 was placed on the vertical sides of the four sides of the form body, and the steel plate 5 was held with the interior plate 7 held by a press plate (not shown). A hard urethane foam material was injected from the injection hole 0 of 1., and a composite panel W integrally formed by the solidification adhesive force of urethane was formed by factory production.

[Mounting of outer wall material (FIG. 1 (A))] FIG. 1 (A)
As shown in, the lower part of the composite panel W, which is the outer wall material of the upper floor, is attached to the outer (wall side) upper part of the beam 10 by the lower mounting hardware 38 with respect to one beam 10, and becomes the outer wall material of the lower floor. The upper part of the composite panel W is attached to the beam 1 by the upper mounting hardware 33.
Although it is attached to the outer upper part of 0, the attachment positions on the beam 10 are apart from the lower attachment hardware 38 and the upper attachment hardware 33.

On the panel W side, the lower mounting hardware 38 is hinged to the nut 9 on the lower inner surface of the panel W with a bolt V ₂ , and on the beam 10 side in the front-back direction with respect to the beam 10 (direction orthogonal to the beam 10). Beam 10 of panel W through a long hole (not shown)
The bolt V ₀ is hinged to the nut 9 welded to the lower surface of the beam 10 by adjusting the front-back position of the beam V ₀ .

On the panel side, the upper mounting hardware 33 has a nut formed by welding a bolt V ₁ through a long hole (not shown) in the longitudinal direction with respect to the beam 10 to the inside of the upper frame of the panel W through a slipper washer 9a. 9 is hinged, and on the beam 10 side, the bolt V ₀ is attached to the nut 9 on the lower surface of the beam 10 while adjusting the longitudinal position of the panel W with respect to the beam 10 through an elongated hole (not shown) in the longitudinal direction with respect to the beam 10. Wear a butterfly.

The lower end of the upper panel W is attached to the single beam 10 by the lower mounting hardware 38, and the upper end of the lower panel W is mounted by the upper mounting hardware 33 at intervals in the longitudinal direction of the beam 10. The bolt holes (not shown) for the beam 10 and the welding nut 9 are also provided at intervals in the longitudinal direction of the beam.

[Mounting of outer wall material on the uppermost floor (FIG. 2 (A))] The panel W for the uppermost floor is also the same structure that basically has the same function as the other panels W, but the upper frame of the cement board 1 The protrusion length from 2 was set to be slightly longer. And the upper mounting hardware 33 '
As shown in FIG. 2A, on the panel W side, the bolt V ₁ passes through a long hole (not shown) in the left-right direction (longitudinal direction with respect to the beam) of the metal piece 33 ′ through the slide allowance washer 9 a. The nut 9 in the frame is hinged, and on the beam 10 side, a long hole (not shown) in the front-rear direction (the direction orthogonal to the beam) of the metal 33 'is fitted to the bolt welded and fixed to the upper surface of the beam 10. After adjusting the front and rear position, tighten the nut.

[Finishing] In the intermediate beam portion shown in FIG. 1, after the hard urethane foam 26 is sprayed on site in the space between the upper and lower panels, concrete stoppers 12 are provided in the gap between the lower end of the panel inner surface and the beam 10. Then, a concrete floor 13 was cast, and then rock wool 14 was sprayed on the beams 10 and columns (not shown) to apply a fireproof layer coating. Then, a sealing 27 was provided between the cement plates of the upper and lower panels.

In the upper part of the uppermost floor panel W shown in FIG. 2, a plate material of extruded expanded polystyrene foam 17 is placed on the upper part of the upper frame 2, and concrete is placed in the gap between the inner surface of the panel W and the beam 10. Deck plate 11 with stop 12
A roof concrete floor 13 'is cast on the roof concrete floor, and a 75 mm thick hard urethane foam board 16 is adhered to the upper surface of the roof concrete floor 13' by a molten asphalt agent so as to be flush with the upper surface of the cement board 1. An asphalt exposed waterproof sheet 18 was adhesively stretched on the surface of the board 16, and stopped at the upper end of the outer wall, that is, at the upper part of the cement board 1 with an aluminum alloy head 20.

The obtained cold bridge prevention structure is a panel W mounting portion (FIG. 1A) where the upper mounting hardware 33 and the lower mounting hardware 38 of the panel W are present in the middle floor beam portion of FIG. In that case, cement board 1-> upper frame 2 (steel plate 5)-> mounting hardware 3
3 (38) → There is theoretically a cold bridge of beams, but in the conventional structure (Fig. 4) cement plate 1 → through angle 15 → in the cold bridge of beam 10, the through angle 15 contacts the entire width of the cement plate 1. On the other hand, since the mounting hardware 33 (38) of the present invention is present on the panel W at intervals, the cold bridge of FIG. 1 has a smaller amount of heat transfer than the cold bridge of FIG.

In addition, theoretically, there is no cold bridge from the cement board 1 to the beam 10 in the portion where the mounting hardware 33 (38) does not exist (FIG. 1 (B)). Since there is no cold heat transfer T ₁ to the back surface of the beam 10 or column (not shown) due to external cold air on the surface of the cement board 1 where the heat insulating layer is absent, the amount of cold heat transfer to the beam 10 or column is the same as in the conventional case. It can be reduced to less than 1/2, and the temperature difference between inside and outside is 20 ° C
In the front and rear and relative humidity of about 35%, no dew condensation phenomenon that would adversely affect the pillars and beams did not occur, so that the cold bridge effect could be substantially prevented.

Further, a mounting portion of the panel W to the beam 10 (see FIG. 2).
Even in (A)), there is theoretically a cold bridge of cement plate 1 → upper frame 2 → upper mounting hardware 33 ′ → beam 10, but cement plate 1 → through angle in the conventional structure (FIG. 5) In the cold bridge of 15 → beam 10, the through angle is in contact with the entire width of the cement plate and is a cold bridge between the full length of the through angle and the beam, whereas in the structure of FIG. 'Is present on the panel W at intervals, so that the cold bridge of the present invention (see FIG.
The heat transfer amount of (A)) is smaller than that of the conventional cold bridge (Fig. 5).

Moreover, theoretically, there is no cold bridge from the cement board 1 to the beam 10 in the portion other than the mounting portion of the panel W (FIG. 2 (B)), and in the conventional structure of FIG. The cold bridge T ₁ from the cement board 1 side to the beam 10 backside does not occur. Moreover, 'because of the presence of the entire upper surface adiabatic layer 16, the conventional structure (FIG. 5) in at roof concrete floor 13' roof concrete floor 13 is cold bridges T ₂ of the the beam 10 from the end portion of the completely Did not occur.

Then, the beam 10 of the conventional roof floor (FIG. 5) is used.
Since the amount of heat transferred to the cold bridges T ₁ and T ₂ was T ₂ ≧ T ₁ , the amount of heat transferred to the cold bridge of the present invention (FIG. 2) was
It can be reduced to about one-fifth of that in the conventional structure (Fig. 5), and under normal operating conditions, the dew condensation phenomenon that adversely affects columns and beams does not occur, so the cold bridge action is practically I was able to prevent it.

Further, since the composite panel W as the outer wall material is a factory-produced product, the thickness of the laminated form is uniform, and the outer heat insulating building is easily formed only by attaching the composite panel W as the outer wall material to the steel frame structure. Yes, the conventional work of spraying hard urethane foam on the inner surface of the cement board can be omitted, the installation work of the interior board 7'can also be omitted, and the thickness of the outer wall (thickness from the outer surface of the cement board to the inner surface of the interior board) can be made thin. The effective space can be increased and the construction period can be significantly shortened.

In addition, when mounting the composite panel W on the upper portion, the upper mounting metal member 33 is arranged so that the panel upper frame 2 and the beam 10 can relatively slide.
The panel W slides between the upper mounting hardware 33 and the panel W even when the beam 10 is shaken by an earthquake or the like.
It was possible to prevent damage and fall.

[0035]

EFFECTS OF THE INVENTION A composite panel having a cement board, a heat insulating layer, and an interior board is provided with upper and lower frames, and the frame is attached to the beam with a mounting hardware, so that the composite panel can be stretched easily. Then, the composite panel is stretched over the beam to form the outer wall, and the upper and lower panel spacing is hard.
Since the quality urethane foam 26 has only scene spraying, also on the back side of the outer wall of the external insulation form and become by beams and columns exist insulation layer, cold bridges acting from the outside of the cement board is prevented, condensation for beams and columns It can also prevent rust corrosion and mold formation.
Moreover, since the heat insulating layer is formed by injecting the synthetic resin foam between the cement board and the interior material, the adhesion between the layers can be achieved without a gap, and a homogeneous composite panel W can be easily manufactured in a factory. . Further, the lower frame of the composite panel is a lower mounting hardware that is adjustable with respect to the beam, and the upper frame is relatively slidable between the upper frame and the beam with an upper mounting hardware 38 that is adjustable with respect to the panel W and the beam. Since it is movably mounted, an outer wall can be formed that minimizes damage to the panel even if the beam shakes due to an earthquake or the like. Moreover, since the panel is stretched on the beam with the adjustable mounting hardware, it is even and easy.

Further, a heat insulating layer is stretched over the entire upper surface of the roof concrete floor of the steel frame building, and the top floor panel W
Thermal insulation layer 1 on top of upper frame 2 and roof concrete floor 13 '
Since the extruded expanded polystyrene foam 17 was placed also in the interval with 6, the roof concrete floor 13 ′ is shown in FIG.
As shown in FIG. 2, the heat insulating layer 16 on the upper surface and the extrusion on the panel upper frame 2
The expanded polystyrene foam 17 and the panel heat insulating layer 6 can prevent the cold bridge action into the building, and can prevent dew condensation and rust corrosion on the steel aggregate inside the building.

Further, since the composite panel W in which the cement board, the heat insulation layer and the interior material are laminated and integrated is stretched over the beam as the outer wall material, and the heat insulation layer is stretched over the entire upper surface of the roof concrete floor, the cement board It is possible to prevent cold heat transfer from the back of the beams and columns to the back of the beams and columns, and also to prevent the heat transfer from the edges of the roof concrete floor to the back of the beams and columns, thus improving the durability of the steel building.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a beam portion between floors of the present invention, in which (A) is a mounting structure of a panel W and (B) is a diagram showing a place without a mounting hardware.

FIG. 2 is a vertical cross-sectional view of the roof beam portion of the present invention,
(A) is a figure which shows the attachment structure of the panel W, (B) is a figure which shows the place without an attachment metal object.

3A and 3B are views showing a panel W of the present invention, in which FIG. 3A is an overall perspective view, FIG. 3B is a horizontal sectional view, and FIG.

FIG. 4 is a partial vertical perspective view of a conventional beam section between floors.

FIG. 5 is a vertical cross-sectional view of a conventional roof beam portion.

[Explanation of symbols]

1 ... Cement board 2 ... Upper frame 3 ... Side frame 4 ... Bottom frame 5 ... Steel plate 6 ... Hard urethane foam (heat insulation layer) 7, 7 '... Interior plate 8 ... Bolt hole 9 ... Nut 10 ... Beam 11 ... Deck plate 12 ... Concrete stop 13 ... Concrete floor 13 '... Roof concrete floor 14 ... Rock wool 15 ... Through angle 16 ... Hard urethane foam board (heat insulation layer) 17 ... Extruded expanded polystyrene foam 18 ... Asphalt exposure waterproof 20 ... Kasagi 27 ... Ceiling

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Setsuya Matsumoto               48-1 Higashi-ku Kita 48-jo Higashi 14-chome, Sapporo, Hokkaido               No. Matsumoto Kenko Co., Ltd. (72) Inventor Kazuhisa Morimoto               48-1 Higashi-ku Kita 48-jo Higashi 14-chome, Sapporo, Hokkaido               No. Matsumoto Kenko Co., Ltd. (72) Inventor Takamitsu Sakuraba               Hokkaido Kita 39 Higashi-ku East 20-chome 1-10               No. within Tesuku Co., Ltd.                (56) References JP-A-61-146944 (JP, A)                 Actual exploitation Sho 57-47616 (JP, U)                 Actual Kaihei 5-64327 (JP, U)                 Japanese Patent Publication 6-63292 (JP, B2)

Claims (2)

(57) [Claims] 1. A cement board (1), a synthetic resin foam heat insulating layer (6), and an interior board (7) comprising at least an upper frame (2) and a lower frame (4), and a synthetic resin foam The composite panel (W) laminated and integrated by solidification and adhesion of the heat insulating layer (6) is used as an outer wall material, and the upper frame (2) and the lower frame (4) are attached to the beam (10) by the mounting hardware (33, 33 ', 38). ), And a heat insulating layer (16) of synthetic resin molded foam is stretched over the entire upper surface of the roof concrete floor (13 ′),
Hard urethane is placed between the upper and lower panels of the composite panel (W).
And only situ spray form (26), upper and roof concrete floor (13 ') extrusion foaming the distance between the heat insulating layer (16) on polystyrene of the upper frame of the composite panel (W) (2) follower
From the cement board (1) of the composite panel (W) and the roof concrete floor (13 ') by placing the boom (17) and covering the upper surface of the heat insulation layer (16) with the waterproof layer (18). A cold bridge prevention structure in a steel-framed building in which cold heat transfer to the beam (10) by external cold air is blocked. 2. A composite panel (W) having an upper mounting hardware (33, 3) adjustable with respect to both the panel W and the beam 10.
The upper frame (2) and the beam (10) are relatively slidably attached to the beam (10) by means of 3 ') and a lower mounting hardware (38) adjustable with respect to the beam (10). Item 1. Cold bridge prevention structure.