JPH1088588A - Concrete placing form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a concrete placing form while keeping the strength and having fixed flame retardancy by sticking a flame retardant plate material onto the interior side surface of a form body formed of a plastic material heightened in ignition point by mixing a filler thereto. SOLUTION: A form body 16 formed of a first panel 20, a second panel 22, a rib 24, a block 28, a first fitting part 34 and a second fitting part 36 is extrusion molded by a plastic material increased in ignition point by mixing a flame retardant filler thereto. A heat insulating layer 26 is continuously formed out of an air layer formed of the first panel 20, the second panel 22 and the rib 24. A nonwoven fabric 30 is fixed as water permeable layer on the concrete wall 14 side surface of the hollow block 28, and the space surrounded by the block 28, the first panel 20 and the nonwoven fabric 30 forms a conduit 32. The ignition point of the form body 16 is increased, whereby a plate material 18 can be thinned to reduce the whole thickness and the weight, and since it is not required to provide a cavity between the form body 16 and the plate material 18, a sufficient strength can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete driving form, and more particularly, to a concrete driving form which is used, for example, for driving concrete walls and has flame retardancy.

[0002]

2. Description of the Related Art Plastic building materials are treated as combustibles in accordance with the Building Standards Law, and therefore cannot be used as they are as finishing materials for places requiring a certain level of flame retardance, such as parking lots and basements. Therefore, conventionally, a non-combustible plate such as an aluminum plate or a calcium silicate plate has been attached to the surface of a plastic building material to impart a certain level of flame retardancy.

[0003]

In the prior art, a non-combustible plate material or the like is attached to impart a certain level of flame retardancy to plastic building materials. For this purpose, the thickness of the plate material must be sufficiently large. However, there has been a problem that the weight becomes heavy as a whole. As a means to solve this problem, providing a cavity between the plastic building material and the board,
The use of foamed plastic building materials has been used to reduce the weight, but in this case, there was another problem that the overall strength was insufficient and the material was easily broken.

[0004] Therefore, a main object of the present invention is to provide a concrete driving formwork which can be reduced in weight without causing insufficient strength and has a certain flame retardancy.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a mold body formed of a plastic material having a water permeable layer, a headrace, and a heat insulating layer and having a higher ignition point by mixing a filler than in the case of no mixing. , And a concrete driving form provided with a plate material that is attached to the indoor side surface of the form body and has flame retardancy equal to or higher than semi-flammability.

[0006]

[Function] Since the mold body is molded from a plastic material mixed with a filler and having a higher ignition point, and the flame retardancy is imparted to the mold body itself, it is semi-flammable attached to the surface of the mold body. Alternatively, the non-combustible plate may be thin.

[0007]

According to the present invention, the thickness of the plate can be reduced, so that the overall weight can be reduced. Also,
Since there is no need to provide a cavity between the plate material and the form body or to foam the plastic material, sufficient strength can be ensured. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete driving form 10 of the embodiment shown in FIGS.
And includes a form body 16 and a plate 18 attached to the indoor side surface of the form body 16. The mold body 16 includes a first panel 20 and a second panel 22 arranged in parallel with each other. The first panel 20 and the second panel 22 are connected by a plurality of ribs 24 extending in the vertical direction, and an air layer formed by the first panel 20, the second panel 22 and the ribs 24 is continuously formed in the horizontal direction. 26. A plurality of vertically extending hollow blocks 28 are formed at regular intervals on the surface of the first panel 20 on the concrete wall 14 side, and a nonwoven fabric 30 as a water-permeable layer is formed on the surface of each block 28 on the concrete wall 14 side. Is fixed. The space surrounded by the block 28, the first panel 20, and the nonwoven fabric 30 becomes the water conduit 32. At one end and the other end of the heat insulating layer 26, a first fitting portion 34 and a second fitting portion 36 for connecting to another mold 10 are formed. Then, the plate member 18 is attached to the surface of the second panel 22 on the basement room 12 side.

Here, the first panel 20 and the second panel 2
2, the rib 24, the block 28, the first fitting portion 34 and the second fitting portion 36 are made of a plastic base material such as hard vinyl chloride or the like and a flame-retardant material such as silicate glass, aluminum hydroxide or antimony trioxide. It is extruded and molded from a plastic material having a higher ignition point than the case where no filler is mixed. In addition, as the plate material 18, a semi-combustible or non-combustible material such as an aluminum plate, a calcium silicate plate, or a gypsum board is used. Then, the type and mixing ratio of the flame-retardant filler, the type of the plate material 18, and the like are selected so that the entire concrete driving formwork 10 can be certified as quasi-incombustible under the Building Standards Law.

The inventors of the present invention used a rigid vinyl chloride base material having an ignition point of 454 ° C., changed the type and mixing ratio of the flame-retardant filler and the type of the plate material 18, and constructed each concrete driving form 10. A quasi-incombustible fire test (perforation test) according to the standard method was performed. Table 1 summarizes the experimental results in a table, and FIGS. 4 to 7 are graphs of the experimental results.

[0011]

[Table 1]

FIG. 4 is a graph showing the relationship between the type and mixing ratio of the flame-retardant filler and the smoke generation coefficient when a calcium silicate plate (incombustible material) having a thickness of 6 mm is used as the plate 18. In order to be certified as non-combustible under the Building Standards Law, the smoke emission coefficient must be 60 CA or less,
FIG. 4 shows that this requirement is satisfied regardless of the type and mixing ratio of the flame-retardant filler.

FIG. 5 is a graph showing the relationship between the type and mixing ratio of the flame-retardant filler and the smoke generation coefficient when a 9 mm-thick gypsum board (quasi-noncombustible material) is used as the plate 18. FIG. 5 shows that when silicate glass is used as a flame-retardant filler in an amount of 20% or more, aluminum hydroxide is used in an amount of 13% or more, or antimony trioxide is used in an amount of 20% or more, the smoke generation coefficient is 6%.
It becomes 0 CA or less, and it turns out that the requirement of quasi-nonflammability is satisfied.

FIG. 6 is a graph showing the relationship between the type and mixing ratio of the flame-retardant filler and the afterflame time when a calcium silicate plate (incombustible material) having a thickness of 6 mm is used as the plate material 18. In order to be certified as non-flammable under the Building Standards Act, the afterflame time must be 90 (seconds) or less.
It is understood that this requirement is satisfied when 4% or more, 5% or more of aluminum hydroxide or 2% or more of antimony trioxide is mixed.

FIG. 7 is a graph showing the relationship between the type and mixing ratio of the flame-retardant filler and the residual flame time when a gypsum board (quasi-incombustible material) having a thickness of 9 mm is used as the plate 18. FIG. 7 shows that when silicate glass is used as a flame-retardant filler at 40% or more, aluminum hydroxide at 28% or more, or antimony trioxide at 9% or more, the after-flame time is 90%.
(Seconds) or less, which indicates that the requirement for semi-incombustibility is satisfied.

Therefore, when a calcium silicate plate (incombustible material) having a thickness of 6 mm is used as the plate material 18, 24% or more of silicate glass, 5% or more of aluminum hydroxide, or 2% or more of antimony trioxide are mixed. When a gypsum board (quasi-incombustible material) having a thickness of 9 mm is used as the plate material 18, when 40% or more of silicate glass, 28% or more of aluminum hydroxide, or 20% or more of antimony trioxide are mixed, respectively. It can be understood that the concrete driving form 10 of the present invention satisfies the requirement of quasi-incombustibility in both the smoke generation coefficient and the after-flame time.

When the concrete wall 14 is cast using the concrete casting formwork 10, first, as shown in FIG. 2, a groove 42 is formed on the upper surface of a slab 40 in which a spring tank 38 is formed. Then, a water passage 44 is provided in the groove 42.
Then, the mold 10 is assembled on the water passage 44 such that the bottom surface contacts the stopper 46 of the water passage 44. Then, the concrete wall 14 is cast between the formwork 10 and the concrete retaining wall 48. Before the concrete wall 14 is hardened, the excess water of the concrete flows into the water conduit 32 through the nonwoven fabric 30 as the water permeable layer, flows down the water conduit 32, and passes through the water conduit 44 and the water conduit 50 provided in the slab 40. The water is discharged to the spring tank 38. On the other hand, after the concrete wall 14 has hardened, the water leaked to the surface of the concrete wall 14 through the cracks 52 formed in the concrete wall 14 is discharged to the spring tank 38 in the same manner as the surplus water. Further, heat from the concrete wall 14 is blocked by the heat insulating layer 26, so that dew condensation on the surface of the formwork 10 can be prevented.

Further, if a fire occurs in the basement 12 after the construction, the flame and heat are shut off by the semi-incombustible or non-combustible plate member 18, and the ignition point of the form body 16 is raised. Combustion of the mold 10 can be prevented. According to this embodiment, since the firing point of the form body 16 is raised, the thickness of the plate 18 can be reduced. Therefore, the overall thickness and weight can be reduced. Further, as in the prior art, the form body 16 and the plate 18
Since there is no need to provide a cavity between them, sufficient strength can be ensured.

The form body 16 may be of various shapes as disclosed in Japanese Patent Application No. 4-181958, in addition to the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a use state of the embodiment in FIG. 1;

FIG. 3 is a perspective view showing a use state of the embodiment in FIG. 1;

FIG. 4 is a graph showing the relationship between the type of concrete driving formwork and the smoke generation coefficient.

FIG. 5 is a graph showing the relationship between the type of concrete driving formwork and the smoke generation coefficient.

FIG. 6 is a graph showing the relationship between the type of concrete driving form and the after-flame time.

FIG. 7 is a graph showing the relationship between the type of concrete driving formwork and the after-flame time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Concrete casting formwork 12 ... Basement 14 ... Concrete wall 16 ... Form body 18 ... Plate material 20 ... First panel 22 ... Second panel 24 ... Rib 26 ... Heat insulation layer 28 ... Block 30 ... Nonwoven fabric 32 ... Waterway

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Kobayashi 1-5-43 Shitennoji, Tennoji-ku, Osaka Muramoto Construction Co., Ltd. Osaka Head Office (72) Inventor Naohiro Kawaguchi 1-5 Shitennoji, Tennoji-ku, Osaka No. 43 Muramoto Construction Co., Ltd. Osaka Head Office (72) Inventor Masami Yamashita 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Head Office (72) Inventor Koichi Iwanami 1-chome Kyobashi, Chuo-ku, Tokyo No. 7-1 Toda Ken Construction Co., Ltd. Head Office (72) Inventor Akihiro Miwa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Ken Construction Co., Ltd. Head Office (72) Inventor Hideki Kajiwara 64 Ishizukitamachi, Sakai City, Osaka Prefecture No. 64 Inside Kubo Tavinyl Pipe Plant Co., Ltd. (72) Inventor Rikuo Watanabe 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside Kubo Tavinyl Pipe Plant (72) Who Kazutaka Takada Sakai, Osaka Prefecture Ishizukita-cho, 64 address, Ltd. Kubo Tabinirupaipu in the factory (72) inventor Tomoaki Hori Sakai, Osaka Prefecture Ishizukita-cho, 64 address, Ltd. Kubo Tabinirupaipu in the factory

Claims (1)

[Claims] 1. A mold body formed of a plastic material having a water-permeable layer, a headrace, and a heat insulating layer and having a higher ignition point than that of a non-mixed case by mixing a filler, and a chamber of the mold body. A concrete driving formwork comprising a plate material attached to an inner surface and having a flame retardancy equal to or higher than semi-flammability.