JP2016148148A - Lightweight building component and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight building component having high strength and satisfactory fire resistance, and to provide a manufacturing method of lightweight building component.SOLUTION: The lightweight building component is constituted of: a core material of a resin foam; a lath body disposed around the core material; and a mortar surface layer covering entire of the core material with mortar including the lath body. The manufacturing method of the lightweight building component includes the steps of: enclosing the outer periphery of the core material of resin foam with a lath body; fixing the lath body to the surface of the core material; applying mortar on the fixed lath body; and forming the mortar surface layer including the lath body all over the resin foam.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lightweight building member suitable for forming a plate-like building member necessary for building construction, and a method for manufacturing the lightweight building member.

  In recent years, as a wall panel constituting a wall of a building, for example, ALC made of silica powder, cement, quicklime and foaming agent aluminum powder as listed in Patent Document 1 (Japanese Patent Laid-Open No. 7-238614) (Autoclaved Lightweight aerate Concrete) panels are known. For the production of this ALC panel, as described in Patent Document 1, the inorganic material is cured in an autoclave (high heat and high pressure steam kettle) for about 10 hours under a high temperature of 180 ° C. or higher and a steam of 10 atmospheres or higher. There is a problem in terms of cost. In addition, since this ALC panel is essentially an inorganic porous plate, there are certain restrictions on the weight control, and since it is an inorganic porous material, it has water absorption and remains as an outer wall of a building. Cannot be used.

  On the other hand, resin foams such as polystyrene foam are widely used as heat insulating materials for buildings. A large number of closed cells containing air are formed in the heat insulating material made of such a resin foam, and the heat insulating material made of such a resin foam blocks the flow of air in the thickness direction. And the room can be efficiently insulated.

However, such a resin foam is inferior in heat resistance and easily melts down when exposed to flame, and the melted-down resin may burn and cause further fire spread.
The meltdown of the resin foam occurs when the resin foam approaches the flame. For example, as disclosed in Patent Document 2 [Utility Model Registration No. 3103575], concrete is formed on the surface of the resin foam in contact with the flame. The resin foam meltdown and the meltdown resin combustion can be prevented to some extent by arranging the layers so that the resin foam and the flame are not in direct contact.

However, in the heat insulating material disclosed in Patent Document 2, an arbitrarily shaped mesh-like fiber net body made of woven fabric / non-woven fabric is arranged on both sides of the foamed resin board, and the net body has an interval greater than the stitch interval of the net. In this case, the heat insulating material is formed by applying a polymer cement mortar together with the net body.
Therefore, the net body and the polymer cement mortar are not disposed on the side surface and the upper and lower surfaces of the heat insulating material, and the resin foam remains exposed in this portion. Therefore, in the event of a fire or the like, heat flows from the exposed portion of the resin foam, and the resin foam melts down and burns.

Moreover, in the heat insulating material of patent document 2, the net body arrange | positioned on the front and back of a resin foam is stitched | sutured by the connection thread which penetrates a heat insulation board, or is adhere | attached using the surface adhesive of the heat insulation board.
However, when the connecting yarn is passed through the heat insulating board, the front surface and the back surface of the heat insulating material communicate with each other through the hole through which the connecting yarn passes. If there is a hole as described above that communicates the front and back surfaces of the heat insulation board, this hole becomes a cold bridge, and condensation may occur in the part where the cold bridge is formed due to the difference between room temperature and outside air temperature. . There is a problem that such condensation is a major factor that significantly deteriorates building materials.

  Patent Document 2 also shows an aspect in which a net body is bonded to a heat insulating board, but the applied polymer cement mortar exhibits strong alkalinity, and can maintain adhesion for a long time in such a strong alkali atmosphere. There is no adhesive.

JP 7-238614 A Utility Model Registration No. 3103575

An object of the present invention is to provide a lightweight building member that is lightweight, has high strength, and has good fire resistance.
Another object of the present invention is to provide a method for producing a lightweight building member that is lightweight and has high strength and good fire resistance.

A lightweight building member of the present invention includes a core material made of a resin foam, a lath body disposed on the entire circumference of the core material, and a mortar surface in which the entire circumference of the core material is covered with mortar along with the lath body It consists of layers.
In addition, the lightweight building member includes, for example, surrounding the outer peripheral portion of a core material made of a resin foam with a lath body, fixing the lath body to the surface of the core material, and mortar from above the fixed lath body. Can be produced by forming a mortar surface layer with a lath body around the entire circumference of the resin foam.
In the lath body around which the foamed resin core material is wound, it is preferable that a metal lath body is disposed on the surface of the foamed resin core material, and the surface of the metal lath body is further surrounded by a resin lath body.

According to the present invention, the periphery is surrounded by a lath body using a foamed resin as a core material, and the mortar surface layer is formed on the surface with the lath body. The mortar surface layer thus formed imparts strength to the lightweight building member of the present invention and imparts fire resistance to the lightweight building member.
That is, the mortar surface layer formed with a lath body on the surface of the resin foam is a hard mortar cured body, and such a mortar cured body is disposed on both surfaces, side surfaces and upper and lower surfaces of the resin foam. Thus, the flexibility of the resin foam is lost by the mortar surface layer, and the whole has a strength as if it is a mortar cured body.
Furthermore, even if the lightweight building member of the present invention is exposed to a flame by arranging it on both surfaces, side surfaces and upper and lower surfaces of the resin foam, the resin used as the core material by the mortar surface layer on the surface There is no heating to such an extent that the foam melts, and the resin foam as the core material does not melt down.

In particular, in the lightweight building member of the present invention, the core material is a resin foam, and the density of the core material is about 20 to 40 kg / m ^3. Therefore, the surface of the mortar with a lath body around the entire circumference of the core material Even if the layer is formed, it is much lighter than a conventional ALC (Autoclaved Lightweight Aerated Concrete) panel. Therefore, it can be used manually even in a narrow construction site where heavy machinery or the like cannot be used.

  In addition, the resin foam, which is the core material used in the present invention, is easily eroded by termites, but the lightweight construction member of the present invention has a mortar surface layer formed all around, and the mortar surface layer is eroded by termites. As a result, the core material inside is not eroded by termites.

FIG. 1 is a partially cutaway perspective view showing an example of the configuration of a lightweight building member of the present invention. FIG. 2 is a partially cutaway perspective view showing an example of the structure of a building structure in which two layers of lightweight building members of the present invention are stacked via cement layers having vertical and horizontal bars.

Next, the lightweight building member and the manufacturing method thereof according to the present invention will be described in more detail along the manufacturing method with reference to the drawings.
As shown in FIG. 1, the lightweight building member 1 of the present invention includes a core material 10 formed of a resin foam, lath bodies 11 and 12 surrounding the entire circumference of the core material 10, and the lath body 11, 12 and a mortar surface layer 14 formed with 12.

  The resin foam as the core material 10 is preferably a resin capable of forming continuous foaming, and examples of such continuously foamable resins include polystyrene, polyolefin, polyvinyl chloride, and polyurethane. be able to. Among these, it is preferable to use polystyrene.

For example, when a molded body (sheet) is produced by continuous foaming using polystyrene, a foaming agent is mixed with polystyrene while applying high shear stress under heating. As the foaming agent used here, an organic foaming agent having a boiling point that vaporizes at the melting temperature of the resin is preferably used.
For example, in the case of polystyrene, a fluorine-based foaming agent, a chlorine-based foaming agent, or a hydrocarbon-based foaming agent can be used. These can be used alone or in combination. In the present invention, it is preferable to use a hydrocarbon-based blowing agent with a low environmental load. In particular, it is preferable to use n-butane and / or iso-butane among hydrocarbon-based blowing agents. In the present invention, n-butane and iso-butane can be blended in any proportion in the molten polystyrene using a high shear roll.

The polystyrene resin in which the foaming agent is blended as described above foams by passing through the main roller while being heated by the preliminary roller.
In order to form the core material of the lightweight building member of the present invention, the temperature and pressure of the main roller are usually adjusted so that the expansion ratio is 20 to 50 times, preferably 20 to 40 times.

  The thickness of the core material can be appropriately set according to the thickness of the lightweight building member 1 to be obtained, but in order to have good heat insulating properties and self-form supportability, It is set within a range of 20 to 100 mm, preferably 30 to 70 mm. If the core material is too thin outside the above range, even if a mortar surface layer is formed on the entire peripheral surface, the self-form holding force is not sufficient, and sufficient effects may not be obtained with respect to the heat insulation performance. On the other hand, if the thickness exceeds the upper limit, the wall surface of the building formed using this lightweight building member becomes too thick and lacks practicality.

  Further, the width of the core material of the lightweight building member formed here can be adjusted by cutting in the next step, but may be adjusted at the time of this foam molding, usually 200 to 500 mm, preferably It is adjusted within the range of 300 to 500 mm.

  The core material continuously produced as described above is cut into a desired length in the next step through a cooling step. There is no restriction | limiting in particular in the length of a core material, For example, it adjusts to the length in the range of 600-5000 mm so that it can respond to normal use.

  Since the foaming agent remains in the core material obtained as described above, a step of curing for about 1 day to 4 weeks is preferably provided in order to replace the residual foaming agent with air.

As described above, the core material 10 after the curing process is preferably completed is surrounded by the lath body 11.
As the lath body 11 that first surrounds the foamed resin used here, it is preferable to use a metal lath body having an opening of about 5 to 30 mm. If such a metal lath body has a foaming ratio of the foamed resin within the above range, it can be stably locked to the foamed resin as the core material by a locking means such as staples.
Thus, it is preferable to surround the surface of the core material made of foamed resin with the metal lath body 11 and to dispose the resin lath body 12 on the outside thereof. The resin-made lath body 12 is usually disposed around the metal lath body 11 so as to have at least one round, preferably 2-5 rounds.
Although the metal lath body 11 and the resin lath body 12 may be in contact with each other, as shown in FIGS. 1 and 2, the metal lath body 11 and the resin lath body 12 There may be a mortar surface layer between them.

  The resin-made lath used here is preferably a lath made of a natural resin or a synthetic resin network. In particular, the synthetic resin has little fluctuation in characteristics, and in the present invention, it is preferable to use a network made of synthetic resin as the lath body 12.

  Here, as the resin-made lath body 12, a net-like body made of various resins such as polyolefin, polyamide, polyimide, polystyrene, polyether, polyester and polyamideimide can be used, but this lath body 12 has strong alkalinity. Since it is integrated with the mortar it has, it is preferable to use an alkali-resistant synthetic resin lath. In particular, in the present invention, it is preferable to use polyethylene such as linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) or polyolefin such as polypropylene as a resin for forming a lath body. The resin lath body 12 may be a twisted yarn or a single filament aggregate. Further, the resin lath may be formed from a fiber in which a synthetic resin as described above is combined, or may be formed from a natural resin and a synthetic resin.

  As the resin lath body 12 used in the present invention, it is desirable that the mesh made of the resin as described above is a net body having a size of usually 1 to 50 mm, preferably 4 to 40 mm. In particular, by using a mesh body formed from twisted yarn, mortar penetrates into the twisted yarn to form an integrated product with the mesh body composed of twisted yarn, so that the metal lath body 11 and the resin lath body 12 are accompanied. Further, the mortar surface layer 14 forms a rigid structure, and the strength of the mortar surface layer 14 is increased.

The resin lath body 12 is arranged around the entire core member 10 via the metal lath body 11. In this way, the ends of the lath bodies 11 and 12 surrounding the entire periphery of the core member 10 may be connected to the end portions of the lath bodies 11 or 12 of the previous circulation, Moreover, you may fix to the surface of the core material 10 by latching means, such as a staple. When the lath bodies 11 and 12 are locked by members penetrating the front and back surfaces of the core material 10, a cold bridge is formed on the front and back surfaces of the core material 10 by the locking member, and the wall of the portion where the cold bridge is formed The temperature may be different from other parts. For example, in the winter when the outdoor temperature is low and the room is warm, the temperature of the wall part in the room where the cold bridge is formed may decrease, and condensation may occur. In summer, the room is cooled, so condensation may occur on the part where the outdoor cold bridge is formed.
Such condensation causes cracks in the mortar surface layer on the surface of the lightweight building member of the present invention for a long period of time and causes deterioration.

  Therefore, in the lightweight building member of the present invention, the lath bodies 11 and 12 are not locked so as to penetrate the front and back surfaces of the resin foam that is the core material 10, and the surface of the core material 10 is made of metal with staples or the like. It is preferable to fix the made lath body 11. The staple is a U-shaped metal needle, and has a sufficient ability to lock the metal lath body 11 and the resin lath body 12 with respect to a resin foam having an expansion ratio of 20 to 60 times.

  In the above description, the front and back surfaces of the core material 10 have been described mainly. It is preferable to surround and fix with.

  In the present invention, as described above, the entire periphery of the core member 10 is surrounded by the metal lath body 11 and the resin lath body 12, and then the resin lath body is disposed on the resin lath body 12 or above. While the mortar is applied, the mortar surface layer 14 with the metal lath body 11 and the resin lath body 12 is formed.

  Further, a mold having an open top is formed, and a mortar and a resin lath body 12 are previously laminated on the five sides of the mold, and the surface is surrounded by a metal lath body 11. The lightweight building member of the present invention can also be manufactured by fitting the core material 10 and then curing the resin lath body 12 and mortar on the upper surface.

  As the mortar used here, mortar formed from various commercially available Portland cements such as early strength, cement components such as slag cement and water can be used, but in the present invention, Portland cement or early strength is used. It is preferable to use a specific amount of fly ash mixed with Portland cement.

  Fly ash is fine particles having fine pores generated when coal or the like is burned, and is collected by applying a voltage. Fly ash is classified into type I to type IV. In the present invention, it is preferable to use fly ash having an average particle size within the range of 2 to 5 μm classified as type II. That is, type I fly ash has an average particle size that is too small to form a highly uniform mortar during kneading, and type III and type IV fly ash has a large particle probability. The mortar surface layer formed by coating by using type II fly ash, whereas the process for smoothing the surface of the lightweight building member of the present invention is newly required Can be finished evenly without any finishing process. In particular, mortar using Type II fly ash hardens early due to the addition effect of Type II fly ash and can achieve very high workability, and Type II fly ash contains a large amount of hollow particles. Therefore, it acts well on the heat insulation of the lightweight building member of the present invention.

This type II fly ash is very compatible with the Portland cement and the like to be added, and a uniform mixture can be obtained in a short time when mixed with powder-powder. In addition, when preparing mortar by adding water to such a mixture, there is no lifting of Type II fly ash, and a uniform mortar can be rapidly formed as a whole.
Furthermore, the curing time of the mortar can be shortened by using this type II fly ash.

  And when the adherend surface is a resin foam surface such as polystyrene with a metal lath body and a resin lath body, the mortar formed from Portland cement containing Type II fly ash is the most biting. It has also been found that a mortar surface layer can be formed well and stably. There are various reasons why such a result can be obtained. However, since the particle sizes of Portland cement and a large amount of Type II fly ash are balanced, Type II fly ash is contained in Portland cement. Easily incorporated and hardened early, Class II fly ash is compatible with resin foam such as polystyrene, metal lath, and resin lath such as polyolefin. It may be rich. In addition, since the type II fly ash is fine particles having fine pores, the formed mortar surface layer contains air and can be reduced in weight, and this layer also has heat insulation properties. Such a characteristic is an effect which is not recognized when only Portland cement is used.

In order to obtain the effects as described above, in the present invention, the type II fly ash is usually in the range of 5 to 40 parts by weight, preferably in the range of 10 to 35 parts by weight with respect to 100 parts by weight of Portland cement. Use in quantity.
However, when fly ash cement is used as a cement component, it is necessary to determine the amount of type II fly ash to be added in consideration of the type and amount of fly ash that has already been blended.

It is preferable that the resin component is mix | blended with the mortar used by this invention.
In the present invention, the resin component is preferably a re-emulsified powder resin. Such a re-emulsified powder resin is a powder and does not form a cured body with mortar unless water is added. Therefore, a cement component, type II fly ash, and a re-emulsified powder resin are not included. A mortar having an arbitrary viscosity can be formed by mixing uniformly in a powder state, adding water to the mixture thus prepared, and kneading.

  Such re-emulsifying powder resin is usually a powder mainly composed of polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, vinyl acetate / versaic acid vinyl ester, vinyl acetate / versaic acid vinyl ester / acrylic acid ester, etc. Resin. These powdery resins can be used alone or in combination.

  Such a re-emulsifying powder resin is preferably used in an amount in the range of 1 to 20 parts by weight with respect to 100 parts by weight of the cement component.

  By using the re-emulsified powder resin in this way, the resulting mortar surface layer is obtained by combining the type II fly ash and the re-emulsified powder resin with a resin foam, particularly the polystyrene core 10 and the core. The adhesion state to the metal lath body 11 and the resin lath body 12 surrounding the entire circumference of the material surface is remarkably improved.

The mortar used in the present invention is applied to a core material surrounded by a metal lath body and a resin lath body to form a mortar surface layer. The water / cement ratio varies depending on the method of forming the mortar surface layer.
The water / cement ratio should be in the range of 20% to 40% when gunning the mortar surface layer, and it should be in the range of 23% to 35% when coating with pestle. It is good.

  When forming a mortar plane layer, you can use a normal mortar blower or a slag, or after using a normal mortar blower to form a mortar surface layer, use a combination of the two, such as stroking the surface. Of course.

The thickness of the mortar surface layer thus formed is usually 1 to 25 mm, preferably 2 to 20 mm. Such a mortar surface layer is formed not only on the front and back surfaces of the core material surrounded by the lath body but also on both side surfaces and upper and lower surfaces of the resin foam.
By forming a mortar surface layer having such a thickness, the resulting mortar surface layer has a very high affinity for a polystyrene resin foam in which a lath body is surrounded by a polystyrene foam as a core material. The lightweight building member of the present invention forms a strong plate-like body.

Moreover, since the entire circumference is covered with a mortar surface layer, there is almost no water absorption, water resistance is high, and since the resin foam is not exposed, the building is also affected by the damage of termites that prefer to erode the resin foam. Can be protected.
The lightweight building element of the present invention is appearance of the core material but mortars a resin foam is very lightweight, usually 500 kg / m ³ or less, preferably in the range of 500~100kg / m ³ It has a high density, can be operated by human power, and can be used easily even in places where heavy machinery cannot be used such as in narrow alleys.

The lightweight building member of the present invention is excellent in mechanical properties such as bending properties.
The lightweight building member according to the present invention has a bending strength in which a light-weight building member to be tested is placed on a support base having a circular cross section at a position 500 mm away from the center point in the longitudinal direction of the light-weight building member. The member is placed so that the center point is located at the center of the support base, and a load of 25 kg is sequentially applied to the center point of the lightweight building member. The strength of the member was used. The maximum load was 250 kg.
As will be apparent from the following examples, the lightweight building member of the present invention does not break even when a load of 250 kg is applied, and has excellent mechanical strength.
Therefore, the lightweight building member of the present invention can be suitably used as a housing for a wall structure, a floor structure, a roof structure, a ceiling structure, etc. of a building.

  Although the lightweight building member 1 of the present invention can be used as it is, as shown in FIG. 2, the intermediate layer in which the two lightweight building members (rectangular columns) 1, 1 are arranged with a number of horizontal bars 22 and vertical bars 24. It can be used as the structure 2 formed by laminating through 20.

  In order to manufacture the structure 2, two lightweight building members 1 obtained as described above are prepared. This lightweight building member (rectangular column) 1 has a resin foam as a core material 10, and a mortar surface layer 14 is formed with a metal lath body 11 and a resin lath body 12 on the entire circumferential surface thereof.

  A cement mortar layer is formed as an intermediate layer 20 on one surface of the prism 1. The cement mortar used here may be the mortar used for the formation of the lightweight building member 1, but use a cement mortar having a low water / cement ratio in order to give higher strength to the resulting structure. Is preferred. The water / cement ratio of the cement mortar that can be used here is preferably in the range of 20% to 30%, and it is preferable to form a cement mortar that is stiffer than when the lightweight building member 1 is manufactured. The cement mortar is preferably blended with fine aggregate or the like so that the cement mortar maintains a certain shape.

  After the cement mortar layer (half layer of the intermediate layer) is formed on one surface of the lightweight building member (prism column) 1 as described above, the horizontal bars 22 and the vertical bars 24 are placed on the cement mortar layer surface. . The horizontal stripes 22 and the vertical stripes 24 used here are intended to remarkably improve the strength of the structure 2 obtained by the vertical and horizontal stripes.

  Therefore, after arranging the horizontal streak 22 and the vertical streak 24 as described above, the horizontal streak 22 and the vertical streak 24 are embedded in the intermediate layer 20 by applying a cement mortar layer in the same manner as described above.

In the present invention, the diameter of the transverse and longitudinal bars used for the intermediate layer is usually 1.5 to 10 mm, preferably 2 to 7.4 mm, and more preferably 2 to 5 mm.
The vertical and horizontal stripes are arranged with a predetermined width, and the width of the vertical and horizontal stripes is usually 5 to 20 cm, preferably 7 to 15 cm.

  As described above, the horizontal bars 22 and the vertical bars 24 are arranged on the surface of the half cement mortar layer forming the intermediate layer 20, and the remaining half of the cement mortar layer of the intermediate layer 20 is placed on the horizontal bars 22 and the vertical bars 24. The intermediate layer 20 is formed by coating and installing the horizontal streaks 22 and the vertical streaks 24 embedded in a cement mortar layer as an intermediate layer.

  After the intermediate layer 20 is formed in this way, the other lightweight building member (rectangular column) 1 is placed on the surface of the intermediate layer 20 and pressed, and the lightweight building member (rectangular column) 1 / intermediate layer 20 / lightweight. The building member (rectangular column) 1 forms a structure 2 laminated in this order. The thickness of the intermediate layer 20 thus formed is usually in the range of 2 to 20 mm, preferably 4 to 15 mm. By having the intermediate layer having such a thickness, the strength of the structure 2 is remarkably improved. Further, since the resin foam is not contained in the intermediate layer 20, even if the fire spread is extremely intense, the intermediate layer 20 becomes a complete fire barrier.

  The thickness of the structure 2 formed in this way is usually 22 to 150 mm for one lightweight building member 1, and 44 to 300 mm for the two lightweight building members 1. Since the thickness of the intermediate layer is 2 to 20 mm, the total thickness is about 46 to 320 mm.

The structure formed using the lightweight building member of the present invention has a configuration in which the core material forming the lightweight building member is a resin foam, and a mortar surface layer is formed around the entire periphery with a lath body. Since the mortar surface layer disposed around has a very high nonflammability, the lightweight building member of the present invention itself has a high nonflammability, and at the same time, the mortar surface layer cured with a lath body is a core material. A very high mechanical strength is imparted to the resin foam.
Despite having such characteristics, the structure manufactured using the lightweight building member of the present invention is very lightweight and can be assembled manually even in a narrow work site where heavy machinery cannot be inserted. .

  In addition, since there are no fasteners, holes, etc. penetrating the heat insulating material, which cause the occurrence of cold bridges, according to the present invention, condensation due to the formation of cold bridges does not occur, and buildings are built for a long period of time. Can be maintained under suitable conditions.

  In addition, since the entire periphery of the lightweight building member of the present invention is covered with the mortar surface layer and the resin foam is not exposed, no termite damage is caused.

  Furthermore, the use of fly ash opens up new ways of using fly ash.

  EXAMPLES Next, the present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited thereto.

[Example 1]
[Bending strength]
A foamed polystyrene core material having a core material length of 1740 mm, a width of 240 mm, and a thickness of 50 mm was prepared as follows.
Using foaming agent of 5% by weight (use; n-butene: iso-butene weight ratio = 1: 1) with respect to the amount of polystyrene used, foaming is performed at a foaming temperature of 170 to 190 ° C. and a foaming ratio of 20 times for 7 days. Cured.

  Separately from this, use early-strength Portland cement, add 30 parts by weight of type II fly ash to 100 parts by weight of early-strength Portland cement, add 5 parts by weight of re-emulsifying resin, and mix well. Cement mortar was prepared by adding water and kneading so that the water / cement ratio was 30% so that it could be applied by glazing.

A metal lath having an opening of 15 mm was wound around the above-mentioned foamed polystyrene core material, and the ends were driven and fixed to the foamed polystyrene core material with a stapler. The lath body was fixed to the expanded polystyrene core material in the same manner for the side and upper and lower surfaces.
A polyethylene lath having an opening of 5 mm was wound around the expanded polystyrene core surrounded by a metal lath as a whole while applying the cement mortar to a thickness of 5 mm. The curing process was performed three times to create a lightweight building member of the present invention.
In the lightweight building member thus obtained, a mortar surface layer with a lath body having a thickness of 30 mm is formed over the entire circumference of the core material, and there is no portion where the polystyrene core material is exposed.

The lightweight building member after curing as described above is placed on two spacer bars (width: 1000 mm) having a circular section of 500 mm from the center in the longitudinal direction, and 25 kg to 250 kg in the center portion from above. However, it was confirmed that the lightweight building member did not break and had sufficient strength as a building material.
Moreover, although the obtained lightweight building member was set on fire for 1 minute, ignition, meltdown of the polystyrene foam as a core material, and further collapse of the lightweight building member were not recognized.

DESCRIPTION OF SYMBOLS 1 ... Lightweight building member 2 ... Structure 10 ... Core material 11 ... Metal lath body 12 ... Resin lath body 14 ... Mortar surface layer 16 ... (mortar ) Side layer 18 ... (mortar) Top and bottom layer 20 ... Intermediate layer 22 ... Horizontal stripes 24 ... Vertical stripes

Claims (16)

  A core material made of a resin foam, a lath body disposed on the entire circumference of the core material, and a mortar surface layer in which the entire circumference of the core material is covered with mortar with the lath body. A lightweight building material.   2. The lightweight building member according to claim 1, wherein the lath body includes a metal lath body disposed on a core surface and a resin lath body disposed on an outer periphery of the metal lath body. .   The lightweight building member according to claim 1, wherein the resin foam is a polystyrene foam.   The lightweight building member according to claim 2, wherein the resin lath body is made of a synthetic resin network, and the opening of the synthetic resin network is in the range of 1 to 50 mm.   The lightweight building member according to claim 1, wherein the core material has a thickness in a range of 20 to 100 mm.   The lightweight building member according to claim 1, wherein the thickness of the mortar surface layer formed with the lath body is in the range of 1 to 25 mm. 2. The lightweight building member according to claim 1, wherein an overall density of the lightweight building member is 500 kg / m ³ or less.   The lightweight building member according to claim 1, wherein the lightweight building member has a thickness in a range of 22 to 150 mm.   Surrounding the outer peripheral portion of the core material made of resin foam with a lath body, fixing the lath body to the surface of the core material, coating mortar on the fixed lath body, A method for producing a lightweight building member, wherein a mortar surface layer with a lath body is formed on the entire circumference.   The method for producing a lightweight building member according to claim 9, wherein the lath body is fixed to the surface of the core material with staples.   The method for producing a lightweight building member according to claim 9, wherein the resin foam is a polystyrene foam.   The lath body includes a metal lath body and a network made of alkali-resistant glass and / or a synthetic resin, and the mesh has an opening of 1 to 50 mm. Item 10. A method for producing a lightweight building member according to Item 9.   The method for manufacturing a lightweight building member according to claim 9, wherein the thickness of the core material is in a range of 20 to 100 mm. 10. The lightweight building member according to claim 9, wherein mortar is applied around the core material surrounded by the lath body so that the overall density of the lightweight building member is 500 kg / m ³ or less. Production method.   The method for producing a lightweight building member according to claim 9, wherein the mortar surface layer formed with the lath body has a thickness in the range of 1 to 25 mm.   The method of manufacturing a lightweight building member according to claim 9, wherein the thickness of the lightweight building member is in a range of 22 to 150 mm.

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