JP3182403B2 - Protective materials for buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective material for a building such as an opening frame, a pillar, a handrail and the like.

[0002]

2. Description of the Related Art Tubular thermoplastic resin foams having continuous cracks in the longitudinal direction are used as architectural curing materials such as open frames, columns, and handrails, cushioning materials for preventing injuries, protective materials for water pipes, and cushioning packaging materials. It is widely used in various fields as a member. As one of the uses, as shown in FIG. 7, for the purpose of protecting the surface of the pillar 1, the gate 2, and the like in the construction, the side edges 5 a, An example is a tubular resin foam architectural curing material 5 for holding and holding 5a. As a conventional technique relating to such a protective material, for example, there is one disclosed in Japanese Utility Model Publication No. 3045483. The purpose of this technology is to provide a safety indicator that can be easily attached and detached, does not stain or damage the scaffold, can be reused, and has an excellent shock absorbing function. . This safety display body is provided with a slit portion which is cylindrical and extends in the longitudinal direction, is colored in a stripe pattern such that yellow and black alternately on the side surface, and is made of plastic containing air bubbles.

[0003]

However, the above-mentioned safety display body is a perfect circular cylindrical foam, which is bulky when packing and shipping, and requires a lot of logistics costs. There was a problem that space was required.

[0004] It is an object of the present invention to solve the above-mentioned problems without increasing the bulk, thereby reducing the logistics cost and storage space, and furthermore, the grip when the material to be protected such as a pillar is covered and held. An object of the present invention is to provide a high-quality building protective material.

[0005]

The protective material for a building according to claim 1 of the present invention has a continuous crack in a longitudinal direction, and both side edges forming the crack overlap each other,
Is in flat shape of the cross section perpendicular to the longitudinal direction, the density of 0.02~0.20g / cm ³ cylindrical polyethylene resin foam or density 0.015-0.15 / cm ³ cylindrical polypropylene A resin resin foam, wherein the overlapping length is 5 to 40% of the length from one side edge to the other side edge, and the maximum outer diameter of the outer diameter passing through the center of the cross section Is 1.3 to 5.0 times the length of the minimum outer diameter passing through the center of the cross section, and the open cell ratio of the foam is 4
0% or less, and the average bubble diameter is 200 to 800 μm.

The building protective material of the present invention enlarges the internal hollow portion when attaching the tubular foam to a pillar or the like. That is, the building protective material is not bulky because the internal hollow portion is reduced in a normal state. Further, according to the protective material for buildings of the present invention, since the cross-sectional shape is flat (not a perfect circle), it can be stably mounted on the work site, and the volume of the hollow portion is reduced in a normal state. , The distribution cost and storage space can be reduced without bulkiness. Furthermore, when it is attached to a protected material such as a pillar, both side edges overlapping each other are expanded, and the protected material such as a pillar is firmly held by the reaction force (grip force) of the both side edges, and furthermore, its construction The object protection material does not protrude very much into the work space, which is advantageous for work.

According to a second aspect of the present invention, there is provided a protective material for a building according to the first aspect, wherein bulging engagement portions are formed on both side edges forming the crack. ADVANTAGE OF THE INVENTION According to the protective material for buildings of this invention, an engaging part engages mutually, and an engaging part engages with a to-be-protected material, and it can hold | maintain a protective material for buildings reliably.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As a base resin for a building protective material (hereinafter simply referred to as a protective material) in the present invention, a polyethylene resin or a polypropylene resin may be mentioned.
The above polyethylene resin and polypropylene resin are
It is the most suitable resin for imparting flexibility, compressive strain recovery, and flexibility to the protective material of the present invention. Polyethylene resin,
The polypropylene-based resin is a resin containing a polyethylene component and a polypropylene component in an amount of 50 mol% or more, for example, branched low-density polyethylene, medium-density polyethylene,
High-density polyethylene, linear low-density polyethylene, linear ultra-low-density polyethylene, ethylene-propylene block copolymer, ethylene-propylene random copolymer, ethylene-butene block copolymer, ethylene-butene random copolymer, Ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, ethylene ionomer resin in which the molecules of ethylene-methacrylic acid copolymer are cross-linked with metal ions, propylene homopolymer, propylene-ethylene random copolymer Propylene-butene random copolymer, propylene-ethylene-butene terpolymer, propylene-acrylic acid copolymer, propylene-maleic anhydride copolymer, and the like. Further, in the present invention, a graft-modified polyethylene resin obtained by impregnating the above-mentioned polyethylene resin or polypropylene resin with a vinyl monomer such as styrene and performing graft polymerization,
Polypropylene resins can also be used.

The above-mentioned polyethylene resin and polypropylene resin can be crosslinked by peroxide or radiation.
It may be used as it is without cross-linking, but a non-cross-linkable one which has a simple production process and can be recycled is preferable.

[0010] In the present invention, additives used for ordinary extrusion foaming include a crystal nucleating agent, an ultraviolet absorber, an antioxidant, an antistatic agent, a coloring agent, a bubble regulator, a shrinkage inhibitor, and a conductivity imparting agent. is there. For example, as a crystal nucleating agent, aluminum salt of aromatic carboxylic acid, dibenzylidenesorbitol, 2,2-methylenebis (4,6-di-phosphate)
tert-butylphenyl) sodium.
Examples of the foam control agent include talc, silicon oxide, inorganic powders such as silica, zinc stearate, metal salts of higher fatty acids such as calcium stearate, citric acid, and gas decomposed by heating such as sodium hydrogen carbonate. Chemical blowing agents to be generated. In addition, coloring can be performed by adding a coloring pigment or dye such as black, gray, brown, yellow, red, pink, green, and blue, depending on the purpose and application. When the above additives are added, it is usually preferable to adopt a master batch method in consideration of their dispersibility. The addition amount of each of the bubble regulator, the coloring pigment, and the dye is usually 0.001 to 5 parts by weight per 100 parts by weight of the resin.
In addition, it is no different from the conventional art that a necessary amount of a known additive may be added.

In the present invention, as a foaming agent at the time of extrusion, for example, a thermally decomposable solid compound, a volatile liquid or gas, an inert gas or the like is used alone or in combination. As the thermal decomposition type solid compound, azodicarbonamide, dinitrosopentamethylenetetramine and the like can be used, and as the volatile liquid or gas, propane, normal butane, isobutane, normal pentane,
Saturated aliphatic hydrocarbons such as isopentane and neopentane; saturated aliphatic hydrocarbons such as cyclopentane and cyclohexane; 1-chloro-1,1-dichloroethane; 1,1,1,2-tetrafluoroethane; Halogenated hydrocarbons such as 1,1-chloroethane, ethers such as dimethyl ether, ketones such as acetone, and alcohols such as methanol and ethanol can be used. Carbon dioxide, nitrogen and the like can be used as the inert gas. In addition, water can be used as a blowing agent. Also, a mixed foaming agent with isobutane, normal butane, and 1,1,1,2-tetrachloroethane can be preferably used.

FIG. 1 shows an embodiment of the protective material according to the present invention, FIG. 2 shows a lip 20 of a die for extruding the protective material 10, and FIG. 3 shows the shape of FIG. FIG. 5 is an enlarged view of a main part showing a device immediately after extrusion for forming the protective material 10 of FIG.

The protective material 10 shown in FIG.
12 are formed in a cylindrical shape so as to overlap each other, and have a substantially elliptical cross section perpendicular to the longitudinal direction. As a method of forming the protective material 10,
For example, a tandem extruder of a type in which two extruders are connected in series as an extruder is used, and the thermoplastic resin and the cell regulator are supplied to the first extruder. A foaming agent is injected into a foamable melt, which is cooled in a second extruder to an appropriate temperature for foaming, and extruded under a low pressure from a lip 20 of a die attached to a tip of the extruder to form a foam (protection). Material 10) is obtained. At that time, die 2
Immediately after extrusion from 0, the mandrel 7 as shown in FIG.
It is preferable to isolate the side edges 11 and 12 by means such as 0 so that the side edges 11 and 12 do not fuse with each other. In addition, the mandrel 70
It is more preferable that a water channel or the like is formed inside, and cooling water is flowed through the channel, whereby cooling is performed. Both edges 11,1
For example, a protective material 10 having a shape in which the two are overlapped with each other is formed by using a chestnut-shaped lip 20 as shown in FIG. The central part 1 of the foam is separated by a vacuum conveyor 71 while being isolated from each other so as not to be fused and cooled.
4 in the extrusion direction (arrow MD in FIG. 3).
The foam can be easily manufactured by strongly cooling the outer surface of the foam with cold air while transferring the foam to the outer side, and cooling the outer part more than the inner part of the foam.
This utilizes the phenomenon that the higher the surface temperature of the foam immediately after extrusion, the faster the foaming agent escapes from that portion and the foam shrinks accordingly. If the degree of shrinkage of the inner portion of the foam is increased as described above, the foam separated from the mandrel 70 gradually shrinks to the inside of the foam as the temperature decreases, and has a shape as shown in FIG. Curled up. If the length is appropriately cut after or during the contraction, the protective material 10 having the shape shown in FIG. 1 is obtained. In addition, the protective material 10 obtained by increasing the degree of shrinkage of the inner part of the extruded foam as described above has a larger gripping force on the material to be protected than the one formed into the same shape without utilizing the difference in the shrinkage. It is preferable because it becomes large.

In the present invention, in a cross section perpendicular to the longitudinal direction, the thickness of the central portion 14 and the side edges 11, 12
The thickness of the center portion 14 may be greater than the thickness of the side edges 11 and 12, although the thickness may be the same. If no part is provided, the thickness of the central part 14 of the protective material 10 is
It is preferable that the thickness is larger than the thickness of the first and second layers. The reason for this is that both sides 1 are attached to a bar-shaped object such as a handrail.
This is to reduce the step when the layers 1 and 12 overlap each other. The protective material 10 having the side edges 11 and 12 thinner than the central portion 14 can be easily obtained by using a die lip 20 having the shape shown in FIG. In the lip 20 having the shape shown in FIG. 2, the size of the gap is substantially the same between the end 21 of the lip and the center 22 of the lip.
Since the extrusion rate of the foamable melt is lower and the amount of extrusion is smaller in the lip than in the central portion 22 of the lip, as a result, the foam having a thinner side edge 11, 12 than the central portion 14 (That is, the protective material 10) is obtained.

In the present invention, when the protective material 10 is extruded, as the take-up speed increases with respect to the extrusion speed, the surface irregularities tend to decrease and the surface condition tends to improve. However, as the take-up speed increases, the total cross-sectional area of the foam portion of the protective material 10 decreases, so the take-up speed is set in consideration of these points.

In the present invention, the cross-sectional shape of the protective member 10 perpendicular to the longitudinal direction is preferably a flat shape (substantially elliptical shape) as shown in FIG. Since the flattened material is not bulky, for example, the number of the protective materials 10 housed in a certain volume such as a cardboard box packing is greatly increased, and the distribution cost and storage space per one can be reduced. When the cross-sectional shape is flat, the maximum outer diameter (long axis) of the outer diameter passing through the center of the protective material 10 in a cross section perpendicular to the longitudinal direction
Is preferably 1.3 to 5.0 times the minimum outer diameter (short axis) of the outer diameter passing through the center of the protective material 10.
When the ratio of the major axis / minor axis is smaller than 1.3, the effect of reducing the distribution cost is small. On the other hand, if the ratio of the major axis to the minor axis is larger than 5.0, the workability is deteriorated when the material to be protected is covered and fixed, and the protective material 10 may fall off depending on the shape of the protective material 10. There is. In addition, the code | symbol 13 in FIG.
This is a crack formed in the protective material 10.

In the present invention, in the section perpendicular to the longitudinal direction, the length at which the side edges 11 and 12 of the protective material 10 overlap each other is determined from the end of one side edge 11 of the protective material 10 to the other side edge 12. The length to the end, that is, 5 to 40% of the entire width is preferable. If the overlapping length is less than 5%, the effect of reducing storage space and distribution costs is small. On the other hand, if it exceeds 40%, the workability may be deteriorated when the protective material 10 is spread and fixed on the material to be protected. In the present invention, the protective material in a mode in which the cross-sectional shape is a perfect circular shape and the side edges 11, 12 overlap with each other is a cross-sectional shape in the perfect circular shape and the side edges 11, 1 are overlapped.
The storage space and distribution costs can be reduced as compared with the case where the two do not overlap.

FIG. 4 shows another embodiment of the protective member according to the present invention, and FIG. 5 shows a lip 60 of a die for extruding the protective member 50. FIG. 6 shows a state in which the protection member 50 is attached to a column 80 made of H-shaped steel. The protection member 50 shown in FIG. 4 is formed in a cylindrical shape so that the locking portions 51 and 52 mesh with each other, and further, they have a substantially elliptical cross section perpendicular to the longitudinal direction. I have. Further, although the locking portions 51 and 52 shown in FIG. 4 are formed continuously in the longitudinal direction of the protection member 50, they may be formed intermittently. The protective material 50 shown in FIG. 4 has a flat shape and is not bulky as compared with a perfect circular shape, which contributes to a reduction in distribution cost per one. The degree of the flattening is such that the length of the maximum outer diameter (long axis) of the outer diameter passing through the center of the protective material 50 is equal to the length of the minimum outer diameter (short axis) of the outer diameter passing through the center of the protective material 50, which is 1. 3-5.0
Preferably it is twice. When the ratio of the major axis / minor axis is smaller than 1.3, the effect of reducing the distribution cost is small. On the other hand, if the ratio of the major axis to the minor axis is larger than 5.0, it is too flat and may hinder the covering and fixing of the material to be protected. In addition,
Reference numeral 53 in FIG. 4 denotes a crack formed in the protective material 50.

The protective member 50 shown in FIG. 4 uses a die lip 60 having substantially circular enlarged portions 61, 61 having a larger diameter at the end than the other portions as shown in FIG. Since it is formed by the same method as the protection member 10 of the above embodiment, the description is omitted.

The protective member 50 thus formed is
As shown in FIG. 6, when attached to the H-section steel column 80, the locking portions 52, 53 are engaged with the H-section steel flanges 81, 81.
And the protection member 50 is securely held on the pillar 80.

In the protective members 10 and 50 according to the present invention, in a section perpendicular to the longitudinal direction, a portion parallel to the direction of the maximum outer diameter passing through the center of the section (for example, the central portion 1).
4, 54) are preferably flat. The reason for this is that distribution costs and storage space can be further reduced due to the presence of flat portions. In addition, since it is difficult to roll, handling at the work site is further improved. Further, the flat portion such as a pillar is easily brought into surface contact with the material to be protected. Lip 20 of FIG.
And each protective material 1 obtained through the lip 60 of FIG.
Both ends (ends of side edges 11, 12 or side edges 51, 52) in the direction perpendicular to the longitudinal direction of 0,50 are not formed by being cut after extrusion foaming, but are formed by cutting open bubbles. (A skin at the time of extrusion foaming is formed at both ends). Such open cells may damage the surface when in contact with the material to be protected. Therefore, if such a protective material having no open air bubbles is used, even a protected material whose surface is easily damaged can be prevented from being damaged, and can be used with confidence. In the present invention, as the continuous crack, it is preferable that the cracks 13 and 53 formed by the side edges 11 and 12 of the protection member 10 in FIG. 1 and the both edges 51 and 52 of the protection member 50 in FIG. Good workability when attaching and detaching.

The protective members 10 and 50 of the present invention preferably have a length in the longitudinal direction of 5.0 m or less.
More preferably, it is 3.0 m. If it is too long, it is difficult to handle it during transportation and storage, and if it is too short, a plurality of pieces must be attached to the material to be protected, which slightly deteriorates workability. The thickness of the protective members 10 and 50 at the central portions 14 and 54 is preferably 3 mm or more, more preferably 5 mm or more. The thickness of the other portions (excluding the portion extending up to 10 mm from both ends in the direction perpendicular to the longitudinal direction of the protective material) is preferably 2 mm or more, more preferably 4 mm or more. In any case, when the thickness is small, there is a possibility that the grip strength when fixing to the material to be protected is inferior.

In the present invention, the state in which the protective material is fixed to the material to be protected includes, for example, a point contact, a line contact, and a surface contact, and a line contact or a surface contact is preferable.

In the present invention, in a section perpendicular to the longitudinal direction, the radius 1 of the protection members 10 and 50 shown in FIGS.
Preferably, there are 5,55. This round part 15,5
If there is no 5, there is a possibility that the gripping force may be weakened when fixing to the material to be protected.

In the present invention, the density of the foam constituting the protective materials 10 and 50 differs depending on the base resin. For example, in the case of a polypropylene resin, the density is 0.015 to 0.15.
g / cm ³ , and 0.02-0.03 for polyethylene-based resin.
20 g / cm ³ is preferred. As a method for measuring the protective material density, the measurement was performed according to JIS A6767. If the density of each foam constituting the protective material exceeds the upper limit of each density range, the gripping force will be too large when fixing to the protected material, the mounting workability will be inferior, and the cushioning will also be reduced. I do. On the other hand, when the density is below the lower limit of each density range, the gripping strength when fixing to the protected material is inferior, and there is a possibility that sufficient fixing cannot be performed.

In the present invention, the open cell ratio of the foam constituting the protective material is preferably 40% or less, and 25% or less.
The following are more preferred. When the open cell ratio is increased, the gripping force when fixing to the material to be protected is inferior, and there is a possibility that sufficient fixation cannot be performed, and the buffering property also deteriorates. The open cell ratio is defined as the maximum size that can be accommodated in a sample cup of a measuring device without deformation, while the foam is cut into a length of 25 mm ± 1 mm, the thickness is kept as it is (the sample accommodated in the sample cup). Must be at least 6250 mm ³ , if one sample is less than this volume, use more than one at a time to exceed the volume), and transfer this sample to ASTM D-2856-70 (Procedure C) The ratio of the true volume of the foam in the measurement sample was determined using an air-comparison hydrometer according to the above method, and the open cell ratio was calculated.
The apparent volume is an apparent volume obtained from the outer dimensions of the sample: Va (cm ³ ). The true volume of the foam to be measured: Vx (cm ³ ) is the sum of the volume of the resin constituting the foam and the total volume of the closed cells in the foam. Therefore, the volume of the interconnected bubbles (open cell ratio) can be determined by the following equation. However, the weight of the foam to be measured: W (g), the density of the base resin of the foam to be measured:
ρ (g / cm ³ ). Open cell ratio (%) = (Va−Vx) × 100 / (Va−W / ρ)

In the present invention, the average cell diameter of the foam constituting the protective material is preferably 200 to 800 μm.
400 to 600 μm is more preferred. Average bubble diameter of 20
In order to reduce the thickness to less than 0 μm, it is usually necessary to add a large amount of a bubble adjusting agent, which increases the cost. Average bubble diameter is 800μ
When it is larger than m, the surface irregularities of the foam become large or the toughness is poor. As a method of measuring the average cell diameter, the measurement sample is prepared by arranging the central portion 14, 54 at an arbitrary cross section perpendicular to the extrusion direction of the foam.
Was measured for the number of bubbles in the thickness direction: N (pieces) and the thickness at the center thereof: L (μm), and the average bubble diameter was calculated by the following equation. Average bubble diameter (μm) = (L / N)

The protective materials 10 and 50 of the present invention are used as protective materials for buildings such as open frames, columns and handrails.

Hereinafter, the present invention will be described in more detail with reference to Examples.

EXAMPLE 1 In order to obtain the cross-sectional shape of the protective material 10 shown in FIG. 1, a screw made of a branched low-density polyethylene resin (melting point 107 ° C., MI = 4.7 g / 10 min) having a barrel inner diameter of 90 mm was used. Into the feeding section of the mold extruder at a rate of 50 kg per hour, and simultaneously, a cell regulator (talc) at a rate of 1.7 parts by weight per 100 parts by weight of the resin,
Further, an anti-shrinkage agent (stearic acid monoglyceride) was supplied at a ratio of 1.4 parts by weight. Then, a foaming agent (isobutane) was injected into the mixing section of the extruder at a ratio of 6.5 parts by weight to 100 parts by weight of the resin, and the resin and the foaming agent were mixed, as shown in FIG. Extrusion was performed after cooling the resin temperature between the extruder tip and the die to 106 ° C. using a die lip 20. Immediately after the die is extruded, the extruded foam is cooled by a mandrel 70 also serving as a cooling device.
The foams 1 and 12 are isolated so as not to be fused and cooled, and the outer surface of the foam is strongly cooled by cold air while being conveyed by the vacuum conveyor 71, and then cut to a predetermined length by a cutting machine while holding the rolls (not shown). Is done. Then, after a room temperature of 23 ° C. and 72 hours, a protective material 10 having the shape of FIG. 1 is obtained. The density of the obtained protective material 10 is 0.046 g / cm.
³ , the protective material 10 in a cross section perpendicular to the longitudinal direction.
Of the maximum outer diameter (long axis) of the outer diameter passing through the center of the body and the protective material 1
The ratio of the minimum outside diameter (short axis) of the outside diameter passing through the center of 0 to the major axis / minor axis ratio was 1.8, and the minor axis length was 50 mm. The thickness of the central portion 14 of the protective material 10 is 10 mm,
The thickness of the round portion was 9 mm, and the thickness at a position 15 mm from the side edge was 6 mm.

[0030]

Embodiment 2 A protective member 50 having a sectional shape as shown in FIG.
In order to obtain the same, a die lip 60 as shown in FIG. 5 was used. In order to obtain this protective material 50, similarly to the first embodiment, a branched low-density polyethylene resin, a cell regulator,
The anti-shrinkage agent was fed to a screw extruder. Then
The butane foaming agent was injected into the mixing section provided in the extruder, the resin and the foaming agent were mixed, and the resin was extruded after cooling and controlling the resin temperature between the extruder tip and the die. The extruded foam (protective material 50) is isolated and cooled by a mandrel similar to that shown in FIG. 3 so that the both ends are not fused, and the outer side of the foam is strongly cooled by cold air while being conveyed by a vacuum conveyor. Then, it was cut to a predetermined length to obtain a protective material 50. The density of the obtained protective material 50 is 0.046 g / cm.
³ , the length of the maximum outer diameter (long axis) of the outer diameter passing through the center of the protective material 50 in a cross section perpendicular to the longitudinal direction and the protective material 50
Of the minimum outside diameter (short axis) of the outside diameter passing through the center of the
The short axis ratio was 1.6, and the length of the short axis was 52 mm. The thickness of the central portion 54 of the protective material 50 was 9 mm, the thickness of the round portion was 7 mm, and the thickness at the position 20 mm from the side edge (the neck portion at the locking portions 52 and 53) was 7 mm.

[0031]

As described above, the building protective material according to the first aspect has a continuous crack in the longitudinal direction, and both side edges forming the crack overlap with each other to form a cross section perpendicular to the longitudinal direction. Has a flat shape and a density of 0.02-
0.20 g / cm ³ of a tubular polyethylene-based resin foam or a density of 0.015 to 0.15 / cm ³ of a tubular polypropylene-based resin foam, wherein the mutually overlapping length is from one side edge. 5-4 of the length to the other side edge
At 0%, the length of the maximum outer diameter passing through the center of the cross section is 1.3 to less than the length of the minimum outer diameter passing through the center of the cross section.
5.0 times, wherein the open cell ratio of the foam is 40% or less, and the average cell diameter is 200 to 800 μm. ADVANTAGE OF THE INVENTION According to the protective material for buildings of this invention, since a cross-sectional shape is flat shape (it is not a perfect circle), it can be stably mounted on a work site, and the volume of the hollow part is reduced in the normal state. Therefore, it is possible to reduce distribution costs and storage space without bulkiness. Furthermore, when it is attached to a protected material such as a pillar, both side edges overlapping each other are expanded, and the protected material such as a pillar is firmly held by the reaction force (grip force) of the both side edges, and furthermore, its construction The object protection material does not protrude very much into the work space, which is advantageous for work.

A second aspect of the present invention is directed to a building protective material according to the first aspect, wherein bulging engagement portions are formed on both side edges forming the crack. ADVANTAGE OF THE INVENTION According to the protective material for buildings of this invention, an engaging part engages mutually, and an engaging part engages with a to-be-protected material, and it can hold | maintain a protective material for buildings reliably.

[Brief description of the drawings]

FIG. 1 is a perspective view of a protective member according to an embodiment of the present invention, in which both side edges overlap each other.

FIG. 2 is a front view showing a lip shape of a die for forming the protective material of FIG. 1;

FIG. 3 is an enlarged perspective view of a main part showing a part of a device immediately after extrusion for forming the protective material of FIG. 1;

FIG. 4 is a perspective view of a protective member according to another embodiment of the present invention, the protective member having locking portions on both side edges.

FIG. 5 is a front view showing a lip shape of a die for forming the protective material of FIG. 4;

FIG. 6 is a cross-sectional view showing a state where the protection member of FIG. 4 is attached to a protected member.

FIG. 7 is a perspective view showing an example of a usage mode of a conventionally used protective material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Protective material 11, 12 Side edge 13 Split 14 Central part 15 Round part 20 Lip 50 Protective material 51, 52 Engaging part 53 Split 54 Central part 55 Round part 60 Lip 61 Enlarged part 70 Mandrel 71 Vacuum conveyor 80 H-shaped steel 81 Flange

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 21/30

Claims (2)

(57) [Claims] 1. A has a cleft longitudinally continuous, the
Both side edges forming the fracture overlap each other, the shape of the cross section perpendicular to the longitudinal direction is flat, and the density is 0.02 to 0.02.
A cylindrical polyethylene resin foam or density 0.015-0.15 / cm ³ cylindrical polypropylene resin foam 0.20 g / cm ^3, long the overlapping each other
5 to 4 of the length from one side edge to the other side edge
At 0%, the length of the maximum outer diameter passing through the center of the cross section is 1.3 to less than the length of the minimum outer diameter passing through the center of the cross section.
It is 5.0 times, the open cell ratio of the said foam is 40% or less, and the average cell diameter is 200-800 micrometers, The protective material for buildings characterized by the above-mentioned. 2. The building protection material according to claim 1, wherein bulging engagement portions are formed on both side edges forming the crack.