JP2006152719A - Low thermal conductive frame material and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide at a low cost a frame material securely fixed to a wall material or the like and having low thermal conductivity and suppressing reduction of strength and having stable strength. <P>SOLUTION: The frame material has a flange part and a web part. Many discontinuous extraction holes are formed on the plate material constituting the web part in the longitudinal direction. The lateral side of the extraction holes are raised to form a slots holes of a stiffening rib by pressing a die on the extraction holes. The long holes are alternately provided in the width direction of the web part, The thermal conductivity is reduced by shielding or lengthen a heat flow path, and reduction of rigidity of the frame material is suppressed by action of the stiffening rib. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a frame material having low thermal conductivity used for an aggregate of a building.

Generally, as a wall structure of a building, an outer wall material is fixed to the outside of a steel stud with a nail or the like, and an inner wall material such as a gypsum board is attached to the inside of the steel stud. In order to provide heat insulation properties, a space surrounded by the outer wall material, the inner wall material, and the steel studs is filled with a heat insulating material such as glass wool or foamed resin. And as an outer wall material, steel plate compacts, such as a square wave, composite metal siding, ceramics siding, etc. are used.
By the way, in the heat insulation wall structure as described above, for example, in the winter, when the outer wall material is cooled by the outside air, the inner wall material is also cooled through the steel studs to cause condensation on the inner wall material surface and the like. When the dew condensation becomes intense, there is a problem that the inner wall material surface and the wallpaper affixed to the inner wall material are wetted, causing stains and molds or peeling off the wallpaper itself.

Such condensation is due to the good thermal conductivity of the steel frames used as the studs.If the outside air temperature is low, the steel studs become heat conductors and the inner wall surface temperature around the stud mounting part immediately decreases. Is attributed.
For this reason, studies for suppressing heat transfer from the steel frame pillars have been made in various directions. For example, in Patent Document 1, when using a frame material having a flange part and a web part made of steel having good thermal conductivity as a steel interframe, in order to reduce heat conduction, the cross-sectional area of the web part in the vicinity of the flange part is used. It has been proposed to use an intermediate web portion having a smaller cross-sectional area. It is intended to suppress the heat received by the flange portion from being transmitted to the flange portion on the opposite side with less heat transfer in the intermediate web portion. And, as a means of reducing the cross-sectional area of the intermediate web part, the intermediate plate thickness of the web part is made thin, the intermediate part of the web part is made into a mesh shape, many holes are made in the intermediate part of the web part, It is mentioned that the plate thickness in the middle of the part is made thin and made into a mesh shape.

Furthermore, in Patent Document 2, in the metallic frame material having the flange portion and the web portion, the thermal conductivity is increased by increasing the length of the heat path in the direction crossing the hole while preventing the strength reduction as much as possible. In order to reduce the size, a configuration has been proposed in which a large number of holes provided in the web portion are formed by raising side portions of cuts formed in a plate material.
JP 2000-87505 A JP 2002-146936 A

However, in the frame material proposed in Patent Document 1, the cross-sectional area of the intermediate web portion is made smaller than the cross-sectional area of the web portion in the vicinity of the flange portion in order to reduce heat conduction. For this reason, the problem that cross-sectional performance falls by the point of mechanical characteristics will generate | occur | produce.
Further, in the frame material proposed in Patent Document 2, the hole provided in the flange portion is formed by raising the side of the cut in the plate material. For this reason, when a cut is made or when the side of the cut is raised, a crack is easily generated at the end of the cut, and this crack tends to cause a problem that the mechanical strength of the portion is lowered. In addition, the cut line is not only deformed by being distorted or stretched when it is formed into a desired frame material shape in a subsequent process, but also the strength stability is lowered due to the notch effect. Furthermore, the hole provided in the flange portion is formed in two steps, a step of making a cut in the plate material and a step of raising the side of the cut. In addition, a roll apparatus is used in any process. For this reason, it is necessary to perform the synchronization operation of the two roll apparatuses with high accuracy, and as a result, the manufacturing cost is also expensive.
Therefore, the present invention has been devised to solve such problems, and can be reliably fixed to a wall material or the like, has low thermal conductivity, and has a stable strength with suppressed strength reduction. It aims at providing the frame material which can obtain a thing at low cost.

In order to achieve the object, the low thermal conductivity frame material of the present invention is a frame material having a flange portion and a web portion, and the web portion is provided with a large number of discontinuous long holes in the length direction. The hole is composed of a punched hole and a stiffening rib that has caused the side of the punched hole.
As the hole, it is preferable that curved surfaces are formed at both ends in the length direction.
In addition, it is preferable that the long holes provided in a discontinuous manner in the web portion are in a plurality of rows, and the long holes in the adjacent rows are provided in a staggered arrangement alternately in the width direction of the web portion.
The frame material having a low thermal conductivity according to the present invention includes a step of forming a large number of holes that are discontinuous in the length direction in a plate material that constitutes the web portion of the frame material having the flange portion and the web portion, and thereafter, Manufactured by including a step of pressing the mold to raise the side of the hole. The two steps may be performed before the plate material is divided into a flange portion and a web portion and molded into a frame material, or may be performed after the molding processing.

In the present invention, discontinuous long holes are provided in the length direction of the web portion of the frame material, that is, perpendicular to the heat flow direction. For this reason, the heat flow path is interrupted or complicatedly bent and lengthened, so that the thermal conductivity can be lowered as a result.
Moreover, since the discontinuous long hole is composed of a punched hole and a stiffening rib that causes the side of the punched hole, the strength, particularly rigidity, of the web portion can be increased.
Furthermore, by arranging the long holes in adjacent rows in a staggered manner, the heat flow path is further lengthened, so that not only the thermal conductivity can be lowered, but also the stiffening ribs are increased and the strength is increased. It can contribute to further improvement.
Furthermore, if irregularities are formed in the flange portion of the frame material, the area of the outer wall material and the portion in contact with the inner wall material is reduced, and the heat transfer area is reduced, resulting in lowering the thermal conductivity of the frame material. it can.
And since the above long holes can be easily formed by punching and subsequent press work, the low thermal conductive frame material of the present invention is manufactured with low cost and high accuracy.
The frame material of the present invention can be used not only as a steel frame pillar for supporting a wall material, but also as a roof base support material, a floor support material, a ceiling support material, a partition support material, and the like. .

The frame material of the present invention is not particularly limited as long as it has a flange portion and a web portion. For example, in addition to the lip groove steel having the cross-sectional shape as shown in FIG. 1, a lightweight groove steel, lip Z groove steel, lightweight square steel, I-shaped steel, H-shaped steel, hat-shaped steel, GT type In addition to steel and the like, angle steel and square tubes can also be used.
Since it does not require particularly strong strength, an aluminum alloy or ordinary steel material is sufficient as the material. However, since dew condensation may occur as described above, it is preferable to have corrosion resistance. From this point of view, it is preferable to use one provided with anticorrosion plating, anticorrosion coating, or the like.

  The shape and size of the discontinuous long holes provided in the length direction of the web portion are not particularly limited. It is preferable that the elongated holes are elongated in the longitudinal direction parallel to the longitudinal direction of the web, that is, perpendicular to the heat flow direction. One long hole is preferably 500 mm or less. If the long hole length is too short, the effect of reducing heat conduction is reduced. Conversely, if the length is too long, the strength decreases. As shown in FIG. 2, the long holes are preferably provided in a plurality of rows and in a staggered arrangement alternately in the width direction of the web portion. When the heat flow path is provided in this manner, the heat flow path is interrupted or complicatedly bent and lengthened, so that the thermal conductivity can be lowered as a result.

However, regarding the hole forming the long hole, it is preferable that the curved surface is formed at both ends in the length direction.
For example, as shown in FIG. 3A, if the hole is a simple vertically long rectangle, cracks are likely to occur at the corner when the stiffening rib is subsequently formed. When cracks occur, the strength of the frame material also decreases, and as shown in FIGS. 3B and 3C, round curved surfaces are formed at both ends in the length direction so that cracks do not occur. It is preferable to be shaped as follows.

  There is no restriction | limiting in particular about the formation means of such a hole. A flat protrusion having a sharp tip may be regularly provided on the roll surface, and the roll may be used to form the roll. You may shape | mold by press molding using the metal mold | die which provided the flat protrusion with the sharp tip regularly. Or drilling may be sufficient. In order to form continuously, accurately, and at low cost, it is preferable to mold by punching using a punch whose tip is adjusted to a predetermined shape.

There is no particular limitation on the means for forming the stiffening rib by raising the side of the hole provided in the web portion. Any molding method may be used as long as the side of the hole is raised. For example, the stiffening rib can be easily formed by pushing a punch having an inclined side surface into a hole provided in the web portion.
When the shape of the hole is as shown in FIGS. 3 (a) and 3 (b), it has a cross-sectional shape that is similar to the hole and larger than the stiffening rib forming region, as shown in FIG. It is preferable to push a punch P having a cross-sectional shape having a sharp tip and an inclined side surface into a punched hole formed in the web portion. Even if the shape is as shown in FIG. 3C, the punch having the same shape is used when it is pushed into the hole having the shape shown in FIG. 3B, regardless of the shape of the hole.

The inclination angle of the punch P indicated by α in FIG. 4 is determined by a desired raising angle of the stiffening rib formed by raising the side of the hole. Although depending on the formability of the material metal plate, the raising angle of the stiffening rib is preferably in the range of 20 to 90 degrees. The greater the angle, the greater the resistance to buckling, but the design and other aspects of the mold become extremely difficult due to the effects of springback and other factors. In addition, when it is 30 degree | times or more, the strength improvement effect will become remarkable.
Moreover, it is not necessary to restrict | limit about the width | variety of the side part raised, ie, the height of a stiffening rib part. However, the height of the stiffening rib portion is increased as the width is increased in the side side portion, and a frame material having high rigidity is obtained. Generally, the width is about the same as the width of the first formed hole.

The formation of the hole and the formation of the stiffening rib may be performed at the same time without being divided into two stages.
For example, a punched hole and a stiffening rib can be formed at the same time by press molding using a mold whose tip is adjusted to a predetermined shape and regularly provided with protrusions having inclined side surfaces.
Or you may form by roll shaping | molding using the roll by which the front-end | tip was adjusted to the predetermined shape on the surface, and the processus | protrusion which has an inclined side surface was provided regularly.

There is no particular limitation on the forming means for the unevenness formed in the flange portion to reduce the contact area with other members. It is sufficient if irregularities are formed on the surface, the contact area with the inner wall material and the outer wall material is reduced, and the function of lowering heat conduction is exhibited.
Unevenness may be formed by multi-stage roll forming, or roll forming may be performed using a roll having unevenness formed on the surface, or press forming may be appropriately performed.

C-89 × 40 × 20 × 1.0 lip groove steel (JIS G 3350-1987), which is a JIS G 3321-1998 SGLCC 55% Al-Zn plated steel sheet formed into the cross-sectional shape shown in Fig. 1. . As shown in FIG. 2, punching is performed by a pressing method at a central portion of the web other than the effective width of the plate element under compressive stress, with a width of 2.0 mm, a length of 56 mm, and 1.0 mmR at both ends. Then, the side of the hole was raised by pushing a punch with a tip angle of 90 degrees, and stiffening ribs with a raised width of 1.0 mm and 2.0 mm were formed.
For comparison, a sample having the same hole area and no stiffening ribs was also produced.
Such long holes were provided in four rows parallel to the web direction, and the long holes in adjacent rows were alternately positioned (see FIG. 2).

For the frame material shown in FIG. 1 without a long hole, the frame material with a long hole with stiffening ribs, and the frame material with only a long hole consisting of a simple hole, heat transfer and bending rigidity investigated.
About how heat is transmitted, the heat transmissivity was calculated and evaluated by the heat transmissibility calculation software “TB3D / FDM” of Living Amenity Association. As shown in FIG. 6, the heat transmissivity is obtained by using a C-89 × 40 × 20 × 1.0 channel steel 12 as an intermediate column, and both flanges of the channel steel have a plywood 12 as an outer wall and an inner wall as an inner wall. A gypsum board 14 is arranged, and a wall body model in which a heat insulating material 13 is filled between the plywood 12 and the gypsum board 14 is produced, and the thermal conductivity from the plywood 11 on the outer wall side to the gypsum board 14 on the indoor side is calculated. Was determined by In addition, in FIG. 6, 15 is a hollow layer in a shape steel.

The bending rigidity was determined by a four-point bending test based on JIS A 1414-1994. The bending test is a “spelling” in which the lip channel steel having the cross section shown in FIG. 1 is used as a test material and the two webs are aligned with each other and fixed with bolts as shown in FIG. The distance was set to 1000 mm, and the load was applied in the vertical direction to the flange.
The evaluation results are shown in the following table.

As can be seen from this result, in the frame material provided with the long holes provided in the web portion in order to reduce the thermal conductivity, the stiffening ribs are caused by raising the side as compared with the long holes consisting only of the punched holes. The thing provided with the formed long hole can suppress a strength fall.
Similarly, a frame material with low thermal conductivity and high strength was obtained when the holes were 2.0 mm and 2.3 mm in width.

Diagram explaining the cross-sectional shape of lip channel steel A perspective view of the frame material of the present invention in which a long hole is provided in the web portion of the lip channel steel The figure explaining the shape of the hole which forms a long hole The figure explaining the mode which raises the side of the hole Cross-sectional view explaining the “stitching” tightness of two frame materials Schematic diagram of the wall model for calculating the thermal conductivity

Claims (4)

  A frame material having a flange portion and a web portion, wherein the web portion is provided with a large number of discontinuous long holes in the length direction, and the long holes are composed of a stiffening rib that causes a side hole of the hole and the hole. A low thermal conductive frame material characterized by being made.   The low thermal conductive frame material according to claim 1, wherein the hole is formed with curved surfaces at both ends in the length direction.   3. The long holes provided in a discontinuous manner in the web part in a plurality of rows, and the long holes in adjacent rows are provided in a staggered arrangement alternately in the width direction of the web part. Low thermal conductive frame material.   A step of forming a large number of holes that are discontinuous in the length direction in the plate material constituting the web part of the frame material having the flange part and the web part, and then pressing a die against the hole to cause the side of the hole. The manufacturing method of the low heat conductive flame | frame material characterized by including a process.

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