JP2010202487A - Formwork heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heat a formwork up to a temperature nearly equal to the melting point of sulfur by housing the formwork in a heater body and ejecting steam in the manufacture of a sulfur solidified body panel by forming a heated and melted sulfur-containing material with the formwork and solidifying. <P>SOLUTION: The formwork heating device includes: the box type heating body 1 housing the formwork 6 for filling the sulfur-containing material melted by heating to a set temperature ranging equal to and above the melting point of sulfur from an opening part on the upper surface in the inside and heating; a fall-prevention member 2 provided on the bottom of the heater body 1 and for keeping the heater body 1 to an erection state; an upper cap 3 mounted detachably in the opening part of the upper surface of the heater body 1 and closing the opening part; a steam ejecting pipe 4 connected to a part of the side surface of the heater body 1 to eject steam to the inside; and a steam discharge pipe 5 connected to the other one part of the side surface of the heater body 1 to discharge steam of the inside. The formwork 6 is housed in the heater body 1 and heated to the temperature nearly equal to the melting point of the sulfur by ejecting steam. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, when a sulfur solidified panel is manufactured by molding and solidifying a sulfur-containing material that is heated and molten using a mold, the mold is accommodated in a heater body and steam is injected. The present invention relates to a mold heating apparatus that heats the mold to a temperature about the melting point of sulfur.

In general, concrete in which aggregates are bonded with cement is used as a material for civil engineering and construction. And in the flat panel manufactured with the conventional mortar concrete, since durability as a material is insufficient, intensity | strength might be insufficient in a severe environment. In addition, reinforcing bars and other reinforcing materials are added to reinforce the strength, which increases the thickness and weight of the product. Under such circumstances, a flat panel having high strength is desired as a material for civil engineering and construction.

  On the other hand, in recent years, paying attention to the property of sulfur that is solid at room temperature and melts when heated to about 119 ° C to 159 ° C, a predetermined sample is blended with this sulfur, and it is used for civil engineering and construction. Attempts have been made to use it as one of the materials. The sulfur-containing material using sulfur is known as a material having high strength, excellent water barrier properties, and high acid resistance as compared with ordinary concrete using cement. And since a sulfur containing material is apparently similar in finish and handling to normal concrete, the solidified material is sometimes referred to as sulfur concrete or sulfur solidified material (see, for example, Patent Document 1).

  Here, since sulfur has an ignitability and is handled as a dangerous substance, it is difficult to melt and cast and solidify it on site. In order to improve such a situation, it has been attempted to produce a modified sulfur by mixing a sulfur modifier as an additive with molten sulfur to modify the sulfur. Also, the modified sulfur and fine powder are mixed to produce a molten modified sulfur intermediate material, and the modified sulfur intermediate material and aggregate are mixed and solidified to form modified sulfur. Attempts have been made to produce solidified bodies (see, for example, Patent Document 2).

  Then, in order to cool and solidify the molten sulfur-containing material (or modified sulfur intermediate material) as described above to form a sulfur solidified body (or modified sulfur solidified body), a predetermined shape inside the mold The above sulfur-containing material was poured into and cooled and solidified.

Japanese Patent Laid-Open No. 2004-160693 JP 2005-82475 A

  Here, the sulfur-containing material in a molten state as described above starts to solidify at a point below the solidification temperature of sulfur (about 119 ° C.) and solidifies to a strength higher than that of ordinary concrete. In this case, when the molten sulfur-containing material is poured directly into the mold at room temperature, the sulfur-containing material filled in the mold is rapidly cooled and solidified in the process of solidifying the sulfur-containing material in the mold. It shrunk and a void was formed in the upper part or inside of the sulfur solidified body (specifically, the sulfur solidified body panel), the upper surface was depressed, or bubbles were easily formed on the surface. Therefore, the finish of the sulfur solidified body (sulfur solidified panel) is not clean and the product value is inferior. In addition, when the cavity is large, repair may not be possible.

  In view of this, the present invention addresses such problems and creates a cavity in the upper part or inside of the molded sulfur solidified body (specifically, the sulfur solidified body panel), the upper surface is depressed, or bubbles are formed on the surface. A mold heating device that heats a mold for filling with a sulfur-containing material in a molten state to a temperature about the melting point of sulfur in order to prevent the melting of sulfur. The purpose is to provide.

  In order to achieve the above object, a mold heating apparatus according to the present invention provides a mold for filling a molten sulfur-containing material heated within a set temperature range equal to or higher than the melting point of sulfur from an opening on the upper surface. A box-shaped heater body that is housed inside and heated, a tipping prevention member that is provided on the bottom surface of the heater body and holds the heater body in an upright state, and an opening on the top surface of the heater body An upper lid that can be mounted and closes the opening, a steam injection pipe that is connected to a part of the side surface of the heater body and injects steam therein, and an internal part that is connected to another part of the side surface of the heater body And a steam discharge pipe for discharging the steam. The mold is accommodated in a heater body, steam is injected, and the mold is heated to a temperature about the melting point of sulfur.

  With such a configuration, in a state in which the heater body is held in an upright state by a fall prevention member provided on the bottom surface of the box-shaped heater body, the molten state is heated within a set temperature range above the melting point of sulfur. A formwork for filling the sulfur-containing material is accommodated in the opening from the opening on the upper surface of the heater body, and an upper lid is attached to the opening to close the opening. Steam is injected into the interior with a steam injection pipe connected to a part, and the internal steam is exhausted with a steam discharge pipe connected to another part of the side surface of the heater body. Heat to a temperature around the melting point of.

  An upper lid receiving member for placing the upper lid in a standby state is provided in the vicinity of the opening on the upper surface of the heater body. Accordingly, the upper lid can be placed in a standby state by the upper lid receiving member provided in the vicinity of the opening on the upper surface of the heater body.

  Furthermore, a draining drainage board is provided inside the heater body to support the lower part of the mold housed therein and to drip water adhering to the mold frame. Thereby, the lower part of the mold house accommodated in the inside is supported by the draining drainboard provided inside the heater body, and the water adhering to the mold frame is dropped.

  Furthermore, the said formwork is formed in the flat box shape whose height dimension is small with respect to a bottom area by the upper surface opening shape. As a result, the mold formed in a flat box shape having a top opening shape and a small height with respect to the bottom area is heated to a temperature about the melting point of sulfur.

  According to the invention of claim 1, heating is performed within a set temperature range equal to or higher than the melting point of sulfur while the heater body is held upright by the overturn prevention member provided on the bottom surface of the box-shaped heater body. A mold for filling the melted sulfur-containing material is received from the opening on the upper surface of the heater body, and an upper lid is attached to the opening to close the opening; Injecting steam into the inside with a steam injection pipe connected to a part of the side of the main body, and discharging the internal steam with a steam discharge pipe connected to another part of the side of the heater body, The mold can be heated to a temperature around the melting point of sulfur. Therefore, when the above-mentioned mold is heated to a melting point of sulfur or higher and filled with a sulfur-containing material in a molten state, the sulfur-containing material filled in the mold is not rapidly cooled and solidified. It is possible to improve the finish of the product by preventing a void from being formed in the upper part or the inside of the formed sulfur solidified body panel, the upper surface from being depressed, or bubbles from being formed on the surface.

  Moreover, according to the invention which concerns on Claim 2, an upper cover can be put in a standby state with the upper cover receiving member provided in the vicinity of the opening part of the upper surface of a heater main body. Therefore, it is possible to easily close the opening with the upper lid in a state where the mold is accommodated in the heater body.

  Furthermore, according to the invention which concerns on Claim 3, the lower part of the formwork accommodated in the inside is supported and the water | moisture adhering to this formwork is dripped with the draining drainboard provided in the inside of a heater main body. Can do. Therefore, moisture adhering to the mold taken out from the heater body can be reduced.

  Furthermore, according to the invention according to claim 4, the mold formed in a flat box shape having a top opening shape and a small height with respect to the bottom area can be heated to a temperature about the melting point of sulfur. it can. Therefore, a thin plate-like sulfur solidified body panel can be manufactured by molding and solidifying a molten sulfur-containing material that is heated within a set temperature range that is equal to or higher than the melting point of sulfur, using the mold.

It is a top view which shows embodiment of the formwork heating apparatus by this invention, and shows the state which attached the upper cover to the opening part of the upper surface of a heater main body. It is a front view which shows the said mold heating apparatus, and shows the state which attached the upper cover to the opening part of the upper surface of a heater main body. It is a right view which shows the said mold heating apparatus, and shows the state which put the upper cover in the standby state on the upper cover receiving member provided in the vicinity of the opening part of the upper surface of a heater main body. It is a top view which shows the formwork which is the target object heated with the said formwork heating apparatus. It is a bottom view which shows the said formwork. It is a front view which shows the said formwork. It is a side view which shows the said formwork. It is an enlarged view which shows the A section in FIG. 4, (a) is an enlarged plan view of a nozzle | cap | die attachment part, (b) is an enlarged side sectional view of a nozzle | cap | die attachment part. It is a perspective view which shows the use condition of the said formwork heating apparatus, and shows the state which inserts a formwork. It is a perspective view which shows the use condition of the said mold heating apparatus, and shows the state after inserting a mold. It is a perspective view which shows the use condition of the said mold heating apparatus, and shows the state which covers a top cover after inserting a mold and heats a mold. It is a perspective view which shows the state which fills the molten sulfur containing material in the upper surface opening part of the said formwork after the said heating. It is a perspective view which shows the sulfur solidified body panel which manufactured by placing a sulfur containing material in the formwork heated with the formwork heating apparatus by this invention, and demolding.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
1 is a plan view showing an embodiment of a mold heating apparatus according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a right side view of FIG. The mold heating apparatus accommodates the mold in the heater body when steamed sulfur-containing material is molded and solidified using a mold to produce a solidified sulfur panel. And the mold is heated to a temperature of about the melting point of sulfur, and comprises a heater body 1, an overturn prevention member 2, an upper lid 3, a steam injection pipe 4, and a steam discharge pipe 5. .

  First, a mold that is an object to be heated by the mold heating apparatus according to the present invention will be described. 4 to 7, the mold 6 is made of a metal such as iron, and is formed in a flat box shape. FIG. 4 is a plan view of the mold 6, and the bottom plate 7 is formed in a horizontally long rectangle, for example, and a frame member 8 having a predetermined height is provided around the bottom plate 7. The bottom plate 7 and the four-round frame member 8 are formed in a flat box shape having a top opening shape and a small height with respect to the bottom area. The dimensions of the flat box shape are, for example, 400 mm (vertical) × 800 mm (horizontal) × 12 mm (height). The height may be increased up to about 40 to 50 mm depending on the thickness of the frame member 8.

  In FIG. 4, reference numeral 9 is an opening pin for forming a hole to be opened in the flat portion of the sulfur solidified body panel as a product, and reference numeral 10 is a handle that is held by hand when carrying the mold 6. is there. FIG. 5 is a bottom view of the mold 6, and a bottom frame member 11 having an L-shaped cross section having a predetermined height is provided around the back surface of the bottom plate 7. An anti-slip material 12 for mounting on the work table is provided. FIG. 6 is a front view of the mold 6, and FIG. 7 is a side view of the mold 6.

  4 and 5, a base 13 for injecting pressure air is attached to two locations of the frame member 8 on one side. The base 13 is for injecting pressure air into the boundary between the panel-like object and the mold 6 when the panel-like object molded in the mold 6 is taken out from the mold 6. ), An air injection hole 14 is formed in the boundary portion between the frame member 8 and the bottom plate 7 on the surface of the bottom plate 7. By injecting pressure air from the air injection hole 14, the panel-like material molded in the mold 6 can be peeled off and taken out from the mold 6. In addition, as shown in FIG.8 (b), the inner peripheral edge part of the frame member 8 which contact | connects the surface of the baseplate 7 is made into the inward inclined surface. Thereby, as for the panel-shaped object shape | molded in the said mold 6, the peripheral part of one flat surface is formed in a chamfering shape.

  The mold heating device for heating the mold 6 configured as described above is configured as shown in FIGS. First, the heater main body 1 is heated in a set temperature range equal to or higher than the melting point of sulfur, and the mold 6 for filling the molten sulfur-containing material into the inside from the opening 16 (see FIG. 3) on the upper surface. It is housed and heated and is made of a metal such as iron and is formed in a vertically placed box shape that can house the mold 6. Specifically, since the dimension of the flat box shape of the mold 6 is, for example, 400 mm (vertical) × 800 mm (horizontal) × 12 mm (height), the plate surface of the mold 6 of this size It is formed in a box shape having a space that can be inserted into the interior with the vertical direction being substantially vertical. The surrounding four side surfaces and bottom surface other than the opening 16 on the upper surface are closed with a plate material, and the inner space into which the mold 6 is inserted is sealed by covering the opening 16 with the upper lid 3 described later. It has become. The dimensions of the heater body 1 are not limited to those described above, and may be appropriately selected according to the size of the mold 6 to be heated.

  A fall prevention member 2 is provided on the bottom surface of the heater body 1. This overturn prevention member 2 holds the heater body 1 in an upright state, and is made of a channel material such as iron having a U-shaped cross section as shown in FIG. 2, and the heater body as shown in FIG. 1 has a length of about three times the depth dimension of the heater body 1 and is divided into a plurality of positions (four in the example shown in FIGS. ) Is provided. In addition, the number of the fall prevention members 2 is not limited to four, and may include three or five or more including two at both ends of the width of the heater body 1. Further, the heater body 1 is supported in an upright state on the front side surface and the rear side surface of the heater body 1 in accordance with the positions of the fall prevention members 2 and is reinforced against the water vapor pressure applied to the heater body 1. Auxiliary member 17 that works is provided upright. The auxiliary member 17 is also made of, for example, a channel material made of iron having a U-shaped cross section.

  The upper lid 3 is detachably attached to the opening 16 on the upper surface of the heater body 1. The upper lid 3 closes the opening 16 and is made of a metal such as iron. As shown in FIG. 1, the upper lid 3 covers the entire opening 16 (see FIG. 3) of the heater body 1. The bolt 19 is fastened and fixed to a flange 18 (see FIGS. 9 and 10) that is formed in a flat plate shape and protrudes from the peripheral edge of the opening 16.

  An upper lid receiving member 20 is provided in the vicinity of the opening 16 on the upper surface of the heater body 1. The upper lid receiving member 20 places the upper lid 3 before closing the opening 16 in a standby state. As shown in FIG. 3, the upper lid receiving member 20 is horizontally oriented toward one side surface at the top of the heater body 1. For example, it is made of a channel material such as iron having a U-shaped cross section. In FIG. 1 to FIG. 3, reference numeral 21 indicates a grip portion that is held by hand when the upper lid 3 is moved.

  A steam injection tube 4 is connected to a part of the side surface of the heater body 1 as shown in FIG. The steam injection pipe 4 injects steam into the heater body 1 and is connected to a pipe for supplying steam from a boiler chamber (not shown). A steam discharge pipe 5 is connected to another part of the side surface of the heater body 1. The steam discharge pipe 5 discharges the steam inside the heater body 1 and is connected to a pipe for returning the steam to a boiler chamber (not shown). Reference numeral 22 denotes a pressure meter for measuring the pressure of the injected steam inserted into the steam injection pipe 4, reference numeral 23 denotes a steam opening / closing valve provided in the steam injection pipe 4, and reference numeral 24 denotes a steam discharge pipe. 5 shows a steam open / close valve provided in FIG.

  Furthermore, as shown in FIGS. 2 and 3, a draining slat 25 is provided inside the heater body 1. This draining drainboard 25 supports the lower part of the mold 6 accommodated inside the heater body 1 and drops water adhering to the mold 6 and is made of a metal such as iron. As shown in FIG. 2, the heater body 1 is formed in a slat-like shelf over the entire length of the lateral width of the heater body 1 at a position close to the bottom surface inside the heater body 1.

  In FIG. 3, reference numeral 26 denotes one end of the overturn prevention member 2 that holds the heater body 1 in an upright state on the bottom surface of the heater body 1 and the front side surface of the heater body 1. A reinforcing channel member that is diagonally stretched between the upper end portion of the auxiliary member 17 that supports the heater body 1 in an upright state and that serves to reinforce the steam pressure applied to the heater body 1 is shown. Yes. The channel material 26 can also be used for temporarily placing the mold 6.

  Next, the use of the mold heating apparatus configured as described above will be described with reference to FIGS. First, the mold 6 configured as shown in FIGS. 4 to 7 is inserted into the inside through an opening 16 on the upper surface of the heater main body 1 formed in a vertical box shape as shown in FIG. . Next, holding the holding portion 21 of the upper lid 3 shown in FIG. 10, the upper lid 3 is put on the opening 16 on the upper surface as shown in FIG. 11, and the surrounding bolts 19 are tightened to fix the upper lid 3. In this state, the open / close valve 23 of the steam injection pipe 4 is opened to inject steam into the heater body 1, and the open / close valve 24 of the steam discharge pipe 5 is opened to discharge the steam inside the heater body 1. The mold 6 is heated to a temperature of about the melting point of sulfur (119 ° C.). In this case, for example, water vapor pressurized to 1.5 to 2 atmospheres is injected for 4 to 5 minutes, and the mold 6 is heated to about 120 to 130 ° C.

  Thus, when the sulfur-containing body panel is manufactured by molding and solidifying the sulfur-containing material in a molten state, which is heated within a set temperature range equal to or higher than the melting point of sulfur, using the mold 6, the mold 6 is heated. It can be accommodated in the vessel body 1 and heated to a temperature about the melting point of sulfur. Then, after heating the mold 6, the bolt 19 is loosened to remove the upper lid 3 in FIG. 11, the mold 6 inserted inside is taken out with the handle 10, and sent to the subsequent process.

  FIG. 12 is a perspective view showing a state in which a molten sulfur-containing material is placed in the upper surface opening of the mold 6 in a post-process. In this placing step, in FIG. 11, the heated form 6 is taken out of the heater body 1, placed on the upper surface of the work table 27 shown in FIG. 12, and the sulfur-containing material in a molten state in the form 6 Fill. In other words, the handle 10 of the mold 6 is held and transported above the work table 27, and the bottom frame member 11 and the slip stopper 12 (see FIG. 5) on the back surface are placed on the upper surface of the work table 27 to open the upper surface opening. The mold 6 is placed horizontally and the molten sulfur-containing material 29 accommodated in the container 28 is filled so as to spread over the entire upper surface opening of the mold 6, and the sulfur-containing material 29 is filled. Is placed in the mold 6. At this time, the molten sulfur-containing material 29 may be filled while vibrating the work table 27 to vibrate the mold 6. This is to make it difficult to form a cavity in the filled sulfur-containing material 29.

  In addition, it is good to apply | coat a peeling material in the upper surface opening part of this mold 6 before filling the sulfur-containing material 29 in the said mold 6. FIG. This is for facilitating demolding when taking out the panel-like material filled and molded in the mold 6 from the mold 6. Moreover, it is good to grind up and wipe off the air injection hole 14 of the nozzle | cap | die 13 which inject | pours the pressure air shown to FIG.

  Here, the sulfur-containing material 29 will be described. This sulfur-containing material is solid at room temperature and uses the property of sulfur to melt at approximately 119 to 159 ° C., so that coal ash or sand, It is called a solidified sulfur product produced by mixing gravel and the like, kneading while maintaining approximately 119 to 159 ° C., and cooling and curing the mixture. Alternatively, sulfur that is heated and melted in the same manner and a sulfur modifier that modifies the molten sulfur are mixed to produce modified sulfur, and coal ash, sand, gravel, etc. are mixed with the modified sulfur. In the same manner as described above, it is kneaded while being heated, and is called a modified sulfur solidified body produced by cooling and curing this. That is, the sulfur-containing material includes the above-mentioned sulfur solidified body and the modified sulfur solidified body, and in the following, when simply referred to as sulfur solidified body, it means that the modified sulfur solidified body is included. Suppose there is.

  The modified sulfur solidified body will be described in more detail. The modified sulfur solidified body is produced using sulfur, sulfur modifier, fine powder, and aggregate as raw materials. First, molten sulfur and a sulfur modifier are mixed to produce modified sulfur. Sulfur is normal elemental sulfur, for example, sulfur produced naturally or by desulfurization of petroleum or natural gas. Sulfur modifiers modify molten sulfur by modifying, for example, polymerizing sulfur. The sulfur modifier may be any compound that can polymerize sulfur, for example, an olefinic hydrocarbon or diolefinic hydrocarbon having 4 to 20 carbon atoms, specifically, cyclic olefins such as limonene and pinene. Aromatic hydrocarbons such as hydrocarbon, styrene, vinyltoluene, methylstyrene, dicyclopentadiene (DCPD) and its oligomers, cyclopentadiene, tetrahydroindene (THI), vinylcyclohexene, vinylnorbornene, ethylidenenorbornene, cyclooctadiene And a mixture with one or more of diene-based hydrocarbons and the like. The mixing of the sulfur and the sulfur modifier is performed in a state where sulfur is melted, that is, at a temperature of 119 to 159 ° C, preferably 130 to 150 ° C.

  The modified sulfur can be obtained by melting and mixing sulfur and a sulfur modifier. At this time, the use ratio of the sulfur modifier is based on the total amount of sulfur and the sulfur modifier. Usually, a ratio of 0.1 to 30% by mass, particularly 1.0 to 20% by mass is preferable. The obtained modified sulfur is mixed with fine powder heated to a predetermined temperature (for example, 140 ° C.) to obtain a modified sulfur intermediate material. As the fine powder, one or more of coal ash, silica sand, silica fume, glass powder, fuel incineration ash, electrostatic dust collection ash, and shell pulverized material may be selected.

  The obtained modified sulfur intermediate material is mixed with an aggregate heated to, for example, about 130 to 140 ° C. while being maintained at a temperature capable of maintaining a molten state (for example, 130 to 140 ° C.). . The aggregate is not particularly limited as long as it can be used as an aggregate, and an aggregate generally used in concrete can be used. Examples of such aggregates include natural stone, sand, rubble, dredged sand, steel slag, ferronickel slag, copper slag, by-products generated during metal production, molten slag, shells, and mixtures thereof. 1 type (s) or 2 or more types selected from a group are mentioned. The modified sulfur intermediate material and the aggregate are mixed by using, for example, a kneading apparatus to produce a modified sulfur material, and this is cooled and solidified to produce a modified sulfur solidified body. Such a modified sulfur solidified body can be produced using, for example, a modified sulfur solidified body production system described in Japanese Patent No. 4007997.

  After placing the sulfur-containing material 29 as described above into the upper surface opening of the mold 6 as shown in FIG. 12, the mold 6 is gradually cooled in the air by natural cooling. The panel-like product molded in the mold 6 is taken out from the mold 6 and demolded, and the taken-out panel-like product is cooled in air and cured.

  By performing the above steps, the sulfur-containing material 29 is molded and solidified using the mold 6 (see FIGS. 4 to 6), and the sulfur solidified body panel 30 is manufactured as shown in FIG. Can do. Specifically, for example, a solidified sulfur panel 30 having a size of 400 mm (length) × 800 mm (width) × 12 mm (thickness) and a weight of about 8.5 kg is manufactured. In addition, the thickness of the sulfur solidified body panel 30 can be increased to about 40 to 50 mm by increasing the thickness of the frame member 8 of the mold 6. Moreover, the code | symbol 31 has shown the hole opened in the plane part of the sulfur solidified body panel 30 with the pin 9 for opening of the mold 6 shown in FIG.

  In addition, the sulfur solidified body panel 30 manufactured in this way can be widely used as civil engineering and construction materials. For example, it is used as a corrosion-resistant material for sewer facilities.

DESCRIPTION OF SYMBOLS 1 ... Heater main body 2 ... Fall prevention member 3 ... Top cover 4 ... Steam injection pipe 5 ... Steam discharge pipe 6 ... Formwork 16 ... Opening part 17 ... Auxiliary member 18 ... Flange 19 ... Bolt 20 ... Top cover receiving member 21 ... Top cover Gripping part 25 ... draining drainboard 29 ... sulfur-containing material

Claims (4)

A box-shaped heater body that heats a mold for filling a molten sulfur-containing material that is heated within a set temperature range that is equal to or higher than the melting point of sulfur, and accommodates it inside the opening on the upper surface;
A fall prevention member provided on the bottom surface of the heater body to hold the heater body in an upright state;
An upper lid that is detachably attached to the opening on the upper surface of the heater body and closes the opening;
A steam injection pipe connected to a part of the side surface of the heater body and injecting steam therein;
A steam discharge pipe connected to another part of the side surface of the heater body and discharging steam inside, and
A mold heating apparatus, wherein the mold is accommodated in a heater body, steam is injected, and the mold is heated to a temperature about the melting point of sulfur.   2. The mold heating apparatus according to claim 1, further comprising an upper lid receiving member that places the upper lid in a standby state in the vicinity of the opening on the upper surface of the heater body.   The draining drainage board for supporting the lower part of the mold house accommodated in the inside of the heater main body and dropping water adhering to the mold frame. Formwork heating device.   The formwork according to any one of claims 1 to 3, wherein the formwork is formed in a flat box shape having a top opening shape and a small height with respect to a bottom area. Heating device.

Images