JP2008095434A - Maturation method of concrete and steel form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a maturation method of concrete and a steel form which can realize efficient high-temperature maturation of concrete easily and safely, and which is best suited to application in a construction site of a bulding. <P>SOLUTION: An electrical heater 1 is brought into intimate contact with the outer surface 13 of a steel form 11 with flexible removability, and a plane-surface-shaped heating element having flexibility is built in the electrical heater 1 (a). In this case, a powdery magnet is kneaded on the radiation surface 2a of the electrical heater 1, and the entire part of the radiation surface 2a is made a magnet. Thus, the electrical heater 1 is constituted so that it has flexible removability. Concrete 14 is poured on the inside 12 of the form 11, and the electrical heater 1 is controlled at necessary temperatures, thus the concrete 14 undergoes high-temperature maturation (b). The radiation surface 2a of the electrical heater 1 is brought into intimate contact with the outer surface 13 of the form 11, and maturation of the concrete can be performed by freely controlling the most favorable temperature conditions. A concrete structure 15 can be constructed by formwork removal at an early stage (c). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a concrete curing method and a steel mold used in the method.

  Concrete foundations for housing construction and steel molds were used for various concrete molding in building construction. In this case, the steel formwork was used repeatedly. Further, in this case, various types of accelerated curing are adopted in order to secure the necessary strength of concrete at an early stage and proceed to the next process to shorten the construction period of the entire construction.

  At the construction site, rather than a fully equipped concrete product manufacturing plant, the entire formwork was simply closed, and high-temperature steam was blown from the blower into it to cure the steam. Moreover, the high temperature curing which fills the warm air from a warm air machine within the formwork enclosed with the heat insulating material was also performed (patent document 1).

  Further, an invention has also been proposed in which a belt-like heater is disposed in a wave shape on the outside of a mold and the outside of the heater is covered with a heat insulating sheet (Patent Document 2).

In addition, a method has been proposed in which a concrete placed in a concrete panel is cured at a high temperature by sandwiching a net heater between a fastening formwork and a concrete panel (formwork directly touched with concrete) (Patent Document 3). . In this case, the net heater is configured by forming an electric hotbed from two heating wires, winding the electric hotbed with a glass fiber around the net, and using a plastic binding band.
JP-A-10-227126 JP2002-242434 JP2003-268976

  When using the said warm air machine (patent document 1), you must arrange | position the pipe | tube from a warm air machine along a formwork, and when a pipe | tube is shortened, many numbers of warm air heaters are used. When it was necessary and the tube was lengthened, a large capacity hot air was needed.

  Further, when a belt-shaped heater and a heat insulating sheet are used (Patent Document 2), there is a problem that temperature unevenness occurs between a portion where the heater directly contacts and other portions. Further, since a space is generated between the heater and the heat insulating sheet, heat is diffused, and there is a problem that the heat of the heater cannot be effectively used.

  In addition, when using a net heater (Patent Document 3), it is necessary to sandwich the net heater between the fastening molds, and there is a problem that the assembly work of the molds becomes complicated.

  However, the present invention solves the above-mentioned problems because the planar and flexible electric heater is detachably attached to the outer surface of the steel mold.

  That is, according to the present invention, a planar and flexible electric heater is detachably attached to the outer surface of a steel mold, concrete is placed in the mold, and the electric heater is heated to a necessary temperature. The concrete curing method is characterized in that the concrete is cured at a high temperature.

  Further, the invention of the steel mold is characterized in that a flexible planar electric heater is detachably attached to the outer surface of a steel mold for concrete molding. It is. Here, the electric heater is configured by laminating a flexible sheet-like heating element with a flexible adhesive material having magnetism and a heat insulating material made of a flexible material. It is desirable.

  In this invention, a planar and flexible electric heater is brought into close contact with the outer surface of the steel mold, so that the heat generated by the heating element of the electric heater is efficiently transmitted to the steel mold and further to the concrete, with less energy. Effective high-temperature curing of concrete is possible. Moreover, since it is an electric heater, temperature control is easy, the whole or partial temperature adjustment is possible, and the rise and fall of temperature can also be controlled finely. Moreover, since the electric heater is detachable, the electric heater can be brought into close contact with the formwork at any timing regardless of before and after the formwork construction without affecting the construction and removal work of the formwork. In general, high-temperature curing of concrete can be performed very simply and efficiently, and the construction period and cost can be reduced.

  In addition, since an electric heater is used, no noise is generated during close contact with the formwork, removal work, and curing work, and no fire is used, so no exhaust gas or on-site waste is generated. It is possible to ensure safety and create a clean environment.

  Moreover, in the electric heater of the present invention, if a steel sheet is formed by laminating a planar heating element with a flexible adhesive material having magnetism and a heat insulating material made of a flexible material, Since heat is radiated only to the adhesive material side, not radiated to the heat insulating material side, and radiated only to the adhesive material side, heating with good thermal efficiency can be realized. Moreover, since the thickness of each material can be made thin, the electric heater itself can be formed thin and the formwork to be applied can be expanded.

In the curing method of the present invention,
(1) The electric heater 1 having flexibility (or flexibility) is detachably attached to the outer surface 13 of the steel molds 11 and 11 (FIG. 1A).
(2) Concrete 14 is placed on the inner side 12 of the mold 11, and the electric heaters 1 and 1 are controlled to a necessary temperature to cure the concrete at a high temperature (FIG. 1 (b)).
(3) Since the electric heater 1 is used to adhere to the formwork 11, the optimum temperature condition can be freely controlled, the curing can be performed under the optimum condition, and the concrete structure 15 can be constructed by early demolding ( FIG. 1 (c)).

  Further, in order to attach the electric heater 1 to the mold 11 in a detachable manner, the heat radiating surface 2a of the electric heater 1 is magnetized, and the magnetic shape is applied to the heat radiating surface 2a of the electric heater 1. The magnet is affixed to the heat radiation surface 2a, or a granular or linear magnet is embedded, or a powdered magnet is kneaded. In this case, in order to attach the electric heater 1 to the mold 11 in a detachable manner, it is desirable to magnetize the heat radiating surface of the electric heater 1, but other means such as an adhesive material can also be used. . In addition, the other surface of the heat radiating surface 2a of the electric heater 1 restricts heat radiation by a heat insulating material.

  Embodiments of the present invention will be described with reference to the drawings.

(1) Configuration of Electric Heater 1 An electric heater 1 includes a magnet silicon rubber (adhesive material) 2 (for example, a thickness of 1.5 mm), a planar thin film alloy heating element (planar heating element) 3, and an intermediate silicon rubber 6 Then, a silicon sponge heat insulating material (heat insulating material) 7 (for example, a thickness of 5 mm) is laminated in order (FIGS. 2A and 2B). Any of the materials 2, 6, and 7 have flexibility (or flexibility). In this case, the outer surface 2a of the magnet silicon rubber 2 becomes a heat radiating surface.
Overall, continuous use temperature 200 ° C
・ Maximum temperature 250 ℃
-Satisfies waterproof performance in a pressure test of 1500V x 1 minute in water.
Formed with. Further, if the size is about 25 mm × 50 mm to 700 mm × 700 mm, it can be applied to the outer surface 13 of various molds 11. The thickness can be about 7 mm.

(a) Magnet silicon rubber 2
Magnetic powder is uniformly mixed in a heat-insulating silicon material and solidified to constitute the magnet silicon rubber 2 of the present invention. For example, it is formed so as to have a magnetism of about 400G.

(b) Planar thin film alloy heating element 3
A metal thin film 5 is formed in a folded pattern on a substrate 4 made of silicon material by etching (FIG. 2A). The board | substrate 4 is comprised from the material which has heat insulation, waterproofness, and electrical insulation.
Electrical characteristics, for example, capacity tolerance ± 10%
Absolute resistance value 100MΩ or more
Withstand voltage 1500 V / 1 minute.

(c) Intermediate silicone rubber 6
The intermediate silicone rubber 6 is made of a material having heat insulating properties, waterproof properties, and electrical insulating properties.

(d) Silicon sponge insulation 7
The silicon sponge heat insulating material 7 is a material that is lightweight and has high heat insulating properties by interposing minute bubbles in the silicon material. In our experiment, even when the outer surface 2a of the magnet silicon rubber 2 was 150 ° C., the outer surface 7a of the silicon sponge heat insulating material 7 could maintain 90 ° C.

  When the electric heater 1 of this embodiment is used, since it is planar, there is very little heat generation unevenness compared to the case where a linear heater is used, and since it is planar, it consumes less heat loss. Less power is required. Moreover, since the planar thin film alloy heating element 3 formed by etching is used, the current density per unit area is small, so there is no risk of electric shock due to an error. In contrast, when a linear heater is used, there is a risk of electric shock because the current is concentrated.

  Further, in the planar thin film alloy heating element 3, when a load that changes the resistance is applied, current flows while avoiding the loaded portion, so that excessive heat generation is unlikely to occur in the loaded portion. In such heaters, an excessive current may flow in a loaded portion, which may cause uneven heating and failure.

(2) Temperature controller Temperature range -20 to 200 ° C
Setting error 0.5% FS
Return error 1.5 ℃
Operating environment -10 ~ 50 ℃ Humidity 95% RH
Power consumption 3W
Voltage AC220V
Use a temperature controller with the following specifications (not shown).

(3) Curing method Curing is performed according to the following procedure.

(a) The steel molds 11 and 11 are arranged according to the shape of the concrete structure by a normal method.
The electric heaters 1 and 1 are attached to the outer surface 13 of the steel mold 11 (FIG. 1A). The electric heater 1 is attached so that the outer surface 2a of the magnet silicon rubber 2 is in close contact with the outer surfaces 13, 13 of the molds 11, 11. Even if some irregularities are formed on the outer surface 13 of the mold 11, if the part of the outer surface 2 a of the electric heater 1 can be brought into close contact with the outer surface of the mold, the electric heater is formed by a part of the magnet silicon rubber 2 1 can be attached.
In addition, after the mold 11 is constructed, the electric heaters 1 and 1 are attached, or the electric heater 1 is attached to the outer surface 13 of the mold 11 in advance, or both, thereby constructing the molds 11 and 11. At the same time, the electric heaters 1 and 1 can be attached.
Each of the electric heaters 1 and 1 can be wired in a predetermined manner and connected to a temperature controller (not shown) to increase or decrease the temperature based on a constant temperature or a predetermined program. Moreover, it can also be set to high temperature or low temperature partially (for example according to the thickness of concrete).

(b) When the arrangement of the predetermined molds 11 and 11 and the structural reinforcing bars (not shown) is completed, the concrete 14 is placed on the inner side 12 of the molds 11 and 11 (FIG. 2B). . Subsequently, the electric heaters 11 and 11 are heated based on a preset program. Since the heating of the electric heater 11 is directly transmitted in a planar shape from the outer surface 2a of the magnet silicon rubber 2 to the outer surface 13 of the mold 11, the outer surface side of the concrete 14 can be heated uniformly. Therefore, high temperature curing can be performed very efficiently.
Also, if for some reason the progress of the solidification reaction of the concrete becomes uneven in a certain part, the temperature of the specific electric heater 1 in the corresponding part is raised to promote curing from the surroundings, or the temperature is increased. It can also be lowered to delay the curing from the surroundings.

      (c) When the predetermined curing is completed, if the molds 11 and 11 are removed, the concrete 14 is solidified and the concrete structure 15 can be constructed (FIG. 1 (c)). At this time, the electric heaters 1 and 1 can be easily removed from the removed molds 11 and 11 (FIG. 1 (c), chain lines 1 and 11). Therefore, the formwork 11 is handled in a rough manner during the work of peeling off the adhered concrete or cleaning work, but the electric heater 1 is removed, so that such work is not hindered.

In general, the electric heaters 1 and 1 can be attached and removed without affecting the normal installation and removal of the molds 11 and 11, and the concrete can be cured efficiently. Therefore, the construction period can be shortened and the cost can be reduced.
Moreover, since the electric heater 1 has a waterproof specification, a curing environment equivalent to a high-temperature steam curing can be realized by replenishing moisture around the molds 11 and 11. Moreover, if various sheets are covered on the mold 11, the curing efficiency can be further increased (not shown).

(A)-(b) is the curing method of this invention, and is the schematic longitudinal cross-sectional view explaining construction of a concrete structure. In the heater used for carrying out the present invention, (a) is a plan view partially broken, and (b) is an enlarged sectional view.

Explanation of symbols

1 Electric heater 2 Magnet silicon rubber (adhesive material)
2a Magnet silicon rubber outer surface (heat dissipation surface)
3 Sheet thin film alloy heating element (planar heating element)
4 Substrate of planar thin film alloy heating element 5 Metal thin film of planar thin film alloy heating element 6 Intermediate silicon rubber 7 Silicon sponge insulation (insulation material)
7a Outer surface of silicon sponge insulation 9 Code 11 Steel mold 12 Internal surface of steel mold 13 Outer surface of steel mold 14 Concrete 15 Concrete structure

Claims (3)

A planar and flexible electric heater is detachably attached to the outer surface of the steel mold, and concrete is placed in the mold, and the electric heater is controlled to a required temperature, A method for curing concrete, characterized by high-temperature curing of concrete. A steel formwork characterized in that a flexible planar electric heater is detachably attached to the outer surface of a steel formwork for concrete molding. The electric heater is constructed by laminating a flexible sheet-like heating element with a flexible adhesive material having magnetism and a heat insulating material made of a flexible material. A steel formwork according to claim 2.

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