JP2013011062A - Steel form device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel form device that is excellent in workability and can inexpensively and efficiently cure a concrete skeleton constructed by a steel form.SOLUTION: A steel form device constructs a concrete skeleton using a steel form 1 where a plurality of vertical battens 2 are joined to the back surface thereof along the horizontal direction at predetermined intervals and a plurality of lateral battens 3 are respectively fixed to the vertical battens 2 along the material axis direction of the vertical battens 2. The plurality of lateral battens 3 are fixed to the plurality of vertical battens 2 in a state having a clearance to the back surface of the steel form 1. Concrete curing members, for example, a heating sheet 41 and a heat shielding sheet 42, are provided between the vertical battens 2 in the clearance, and an expansion/contraction member 5 that expands/contracts by the flow in/out of fluid is provided between the curing members and the lateral battens 3. The curing members such as the heating sheet 41 and the heat shielding sheet 42 are fixed to the back surface of the steel form 1 by the expansion of the expansion/contraction member 5.

Description

  The present invention relates to a steel formwork apparatus capable of efficiently curing a concrete frame constructed using a steel formwork in which a plurality of vertical butterflies and a plurality of horizontal butterflies are joined to the back side.

  In recent years, when a reinforced concrete structure including columns and walls is constructed by placing concrete, steel formwork (metal foam) is often used from the viewpoint of divertability and workability. In addition, the concrete to be placed does not exhibit a predetermined strength in a low temperature environment such as a winter season or a cold region, and there is a concern about initial frost damage. It has the property of causing cracks and the like. Therefore, in formwork construction, concrete is cured for the purpose of keeping warm and moistening after placing concrete in the formwork.

  Here, as for the curing method of concrete in a low temperature environment, a blue sheet or a heat insulating sheet is directly applied to the concrete frame including the mold, and the concrete is heated by the hydration heat of the concrete. In general, a concrete frame is heated by interposing a heating sheet or the like (see, for example, Patent Document 1). In addition, in the summer when the temperature is high, water is sprayed on the concrete frame, and further, a heat shielding sheet is applied to block direct sunlight to avoid a sudden dry state.

  However, as concrete curing under low temperature environment such as in winter, cold regions, and extremely cold regions, simply applying a blue sheet, etc. causes the blue sheet to swell due to the wind, etc. In addition to being discharged and cold air flowing into the interior, heat may also escape directly to the outside through a blue sheet or the like. For this reason, it is difficult for the curing method to simply hang blue sheets or the like to keep the temperature suitable for curing concrete, and it takes a long time until the concrete is damaged by frost or developed to a predetermined strength. In addition, in order to avoid the release of heat and the inflow of cold air, the concrete frame is covered with a sheet, and it is also possible to wind and fix the rope etc., but construction to construct a large-scale concrete frame such as a pillar or wall However, such work cannot be performed, and heat cannot be prevented from directly escaping to the outside through a blue sheet or the like.

On the other hand, in the form work of pillars and walls, it was possible to remove the mold after confirming that the compressive strength of the cast concrete was 5 N / mm ² or more.・ By revising “JASS5 Reinforced Concrete Work”, the standard value of the same strength has been changed to 10 N / mm ² or more. Thereby, the retention period of a formwork will be extended, and the problem that the construction period delay (lengthening) and construction cost increase arises. Therefore, particularly in the case of formwork in winter, there is a demand for a method of efficiently curing the concrete frame and promoting the solidification of the concrete.

  Therefore, many techniques other than the above-mentioned patent document 1 have been proposed for efficiently curing concrete by using a steel mold frame to which a heat generating sheet is fixed (for example, refer to patent documents 2 and 3). ).

Japanese Patent Laid-Open No. 01-158884 Japanese Patent Laid-Open No. 08-021087 JP 2003-293380 A

  However, since the prior art described in Patent Document 1 is directed to a wooden mold, it is possible to easily attach a flat heating element (film heater) or the like to the mold with a fixing bracket. However, when applied to a steel mold, there is a problem that it is necessary to provide fixing means in advance by processing or the like, which takes time. In addition, since the fixed hardware is attached to the mold at predetermined intervals in the height direction, the workability is not good, and the fixed hardware is made of metal and has high thermal conductivity, so that heat easily escapes. There is also a problem that the solidified state of the concrete differs between the fixed position and the non-fixed position, and uneven strength is likely to occur. Furthermore, when a curing member such as a heat generating sheet is used, the heat generating sheet or the like may be strongly crushed by the fixing bracket because it is locally fixed to the mold by the fixing bracket. There is a risk of damaging the curing member such as disconnecting the heating element (film heater).

  Moreover, in the prior art described in Patent Document 2, all the curing members such as a heating element and a heat insulating material are fixed by being fitted between a plurality of ribs formed on the back surface of the steel mold, so that workability is improved. There is a problem of being bad.

  Moreover, in the prior art described in Patent Document 3, there is a problem that the heating element is fixed to the steel mold using the magnetic force of the magnet, which is costly.

  Therefore, the present invention provides a steel formwork apparatus that is excellent in workability, inexpensive, and can be efficiently cured for a concrete frame constructed using a steel formwork. Objective.

In order to achieve the above object, the steel formwork apparatus of the invention according to claim 1 of the present application is configured such that a plurality of vertical butter materials are joined to the back surface side at predetermined intervals along the horizontal direction. A steel formwork device for constructing a concrete frame using a steel formwork in which a plurality of horizontal butter materials are respectively fixed along a material axial direction of the material, wherein the plurality of horizontal butter materials are It is fixed to the vertical butter material in a state having a gap with respect to the back surface of the steel mold, and a curing member for concrete is provided between the plurality of vertical butter materials in the gap, and the curing member and the plurality of horizontal butter materials are provided. An expansion / contraction member that expands and contracts when fluid enters and exits is provided, and the curing member is pressed against and fixed to the back surface of the steel mold by expansion of the expansion / contraction member.
Thereby, workability is good, it is cheap, and the concrete frame constructed | assembled using a steel formwork can be cured efficiently.
A steel mold apparatus according to claim 2 of the present application is the steel mold apparatus according to claim 1, wherein the fluid is air.
By using air that is easy to manage and handle in the field as a fluid, the workability can be further improved and the concrete frame can be efficiently cured. Does not adversely affect the environment.
Moreover, the steel mold apparatus of the invention which concerns on Claim 3 of this application is a steel mold apparatus of Claim 1 or Claim 2, WHEREIN: The said curing member is a heat generating member, a heat retention member, and a heat insulation member. One or more of them are provided.
As a result, even in the case of construction in places with severe temperature conditions, such as in cold regions or extremely cold regions, or in the case of long-term construction that is performed not only in the winter but also in the summer, the curing is performed according to the site environment at that time. By selecting one or more heat generating members, heat retaining members, and heat shielding members as members, the concrete frame can be efficiently cured.

  According to the steel formwork apparatus of the present invention, an expansion / contraction member that expands / contracts when fluid enters and exits is provided between the curing member and the plurality of horizontal butter materials, and the curing member is made of steel by the expansion of the expansion / contraction member. Because it is pressed and fixed uniformly against the back of the formwork, it is possible to cure the concrete frame constructed by the steel formwork with good workability, low cost, and efficiency. .

It is a perspective view which shows the assembly state of the steel formwork apparatus which concerns on this invention. It is a perspective view which shows the assembly state of the steel formwork apparatus which concerns on this invention following FIG. It is explanatory drawing which shows an example of the structure of the heat generating sheet applied as a curing member of the steel formwork apparatus which concerns on this invention. It is a perspective view which shows the assembly state of the steel formwork apparatus which concerns on this invention following FIG. It is the top view which shows one Embodiment of construction using the steel formwork apparatus which concerns on this invention, and the expanded sectional view which each shows A part and B part in the top view. FIG. 6 is a side view of the embodiment shown in FIG. 5. It is a front view of one Embodiment shown in FIG.

  First, the assembly procedure of the steel formwork apparatus according to the present invention will be described with reference to the drawings.

≪Assembly procedure of steel formwork equipment≫
FIG. 1 is a perspective view showing a state in which a plurality of vertical butter materials 2 are joined at predetermined intervals to the back surface 1a side of a steel mold 1 constituting the steel mold apparatus according to the present invention.

  First, as shown in FIG. 1, the number of steel molds 1 necessary for constructing a concrete frame are laid out with the surface 1b side thereof on the ground side, and adjacent steel made by a dedicated clip or the like. The molds 1 are connected to each other. Thereafter, a plurality of vertical flaps 2 are placed on the back surface 1a side of the steel mold 1 at a predetermined interval along the horizontal direction (longitudinal direction in the figure) of the steel mold 1. These are joined to the steel mold 1 by known methods such as mounting brackets and bolts. Each vertical butterfly member 2 is formed with a plurality of openings 21 along the material axis direction so that a horizontal butterfly member described later can be fixed therethrough.

  FIG. 2 is a perspective view showing a state in which a heat generating member 41 and a heat retaining member 43 are provided on the back surface 1a of the steel mold 1 in the above state, and a plurality of horizontal butter materials 3 are installed between the plurality of vertical butter materials 2. .

  As shown in FIG. 2, on the back surface 1 a side of the steel mold 1, first, a heat generating sheet 41 having a heat generating function as a curing member for curing the placed concrete between the plurality of vertical butter materials 2. Lay down. Moreover, the heat insulating material 43 which has a heat retention function in the recessed part enclosed by the rib is similarly fitted as a curing member at the both ends (the left and right both ends in the longitudinal direction) of the back surface 1a of the steel mold 1 .

  Further, although not shown in FIG. 2, the heat from the outside is cut off as another curing member on the upper surface side of the heat generating sheet 41 between the plurality of vertical flap members 2 on the back surface 1 a of the steel mold 1. A heat shield sheet 42 having a function is provided (see FIG. 4). Note that the heat generating sheet 41 and the heat shielding sheet 42 are not separate sheets, but may be configured by laminating these sheets as a single sheet. Furthermore, a heat insulating sheet or a heat insulating sheet (not shown) having a heat insulating function may be separately provided between the heat generating sheet 41 and the heat shielding sheet 42. Of course, only the heat generating sheet 41 may be used without providing the heat shielding sheet 42.

  And after spreading the heat-generating sheet | seat 41 and the heat-insulation sheet | seat 42 between the some vertical flap material 2 in the back surface 1 side of the steel formwork 1, as shown in FIG. Two other horizontal flaps 3 are passed through the openings 21 every other, and the vertical flaps 2 and the horizontal flaps 3 are fixed by mounting brackets or the like.

  At that time, in the steel mold apparatus of the present invention, a contracted state, which will be described later, is formed between the heat generating sheet 41 and the heat shielding sheet 42 spread on the back surface 1a side of the steel mold 1 and the plurality of horizontal butter materials 3. A plurality of horizontal flaps 3 are fixed to the vertical flaps 2 with a gap of about several centimeters passing through the expansion / contraction member. Of course, the heat generating sheet 41 and the heat shielding sheet 42 may be spread after the horizontal butter material 3 is fixed to the vertical butter material 2.

  FIG. 3 is an explanatory view showing an example of the structure of the heat generating sheet 41 applied as a curing member.

  As shown in FIG. 3, the heat generating sheet 41 used in the steel mold apparatus of the present invention has a surface covered with UV protection sheets 41a and 41d that prevent deterioration due to ultraviolet rays, and generates heat by energization. A film-like heat generating body (film heater) 41b and a film-shaped heat insulating (heat insulating) sheet 41c for preventing the heat generated by the heat generating body 41b from escaping as much as possible are provided in a laminated state. The structure of the heat generating sheet 41 is an example, and the heat insulating sheet 41c and the UV protective sheets 41a and 41d may be omitted, or a heat insulating sheet is further laminated on the heat insulating sheet 41c. But of course. In short, any material capable of generating heat (heating) for curing concrete may be used.

  FIG. 4 shows a heat generating sheet 41 and a heat shielding sheet 42 on the steel mold 1 by means of an expansion / contraction member 5 disposed between the heat shielding sheet 42 and the horizontal flap material 3 on the back surface 1 a side of the steel mold 1. It is a perspective view which shows the state fixed by the lamination | stacking state.

  As shown in FIG. 4, a cylinder that is between the plurality of vertical butter members 2 on the back surface 1 a side of the steel mold 1 and that expands and contracts between the heat shield sheet 42 and the plurality of horizontal butter members 3 due to fluid entry and exit. Three expansion / contraction members 5 that can hold a sealed state are provided. As the expansion / contraction member 5, an air tube which is generally widely distributed in the market is optimal in terms of workability and price. The number of the expansion / contraction members 5 is not limited to three and can be arbitrarily set. Moreover, the shape is not limited to a cylindrical shape, and may be a form such as a rectangular cushion covering the entire back surface 1a of the steel mold 1 between the vertical flaps 2, and the shape is not particularly limited. . Furthermore, the material may be made of rubber or soft vinyl chloride resin as long as it has elasticity even in an expanded state, and the fluid that enters and exits is also a gas such as air or nitrogen gas or a liquid such as water. As long as it does not impair its elasticity.

  Then, when compressed air from, for example, a compressor (not shown) is injected into each expansion / contraction member 5 disposed in the gap between the heat generating sheet 41 and the heat shielding sheet 42 and the horizontal butter material 3, the expansion / contraction occurs. The member 5 expands, and the heat generating sheet 41 and the heat shield sheet 42 are uniformly pressed against and fixed to the back surface 1a of the steel mold 1 by the expansion pressure.

  As described above, in the steel mold apparatus according to the present invention, the expansion / contraction member 5 that expands / contracts by the entry / extraction of fluid is adopted as means for fixing the curing member such as the heat generating sheet 41 to the back surface 1a of the steel mold 1. Therefore, there is no need to use a metal fixture or magnet as in the prior art, and a curing member such as a heat insulating material is provided between the plurality of ribs formed on the back surface 1a of the steel mold 1. The work to insert the is also unnecessary. Therefore, the curing member can be fixed to the back surface 1a of the steel mold 1 with good workability, low cost, and efficiency.

  Furthermore, even when the heat generating sheet 41 and the heat shielding sheet 42 are fixed to the back surface 1a of the steel mold 1, the expansion / contraction member inflated by the fluid has elasticity, so the film in the heat generating sheet 41 This prevents the heating element such as the heater from being damaged, and improves workability. Moreover, since the heat generating sheet 41 is uniformly pressed against and fixed to the back surface 1a of the steel mold 1 by the expansion / contraction member 5, the solidified state of the concrete becomes almost uniform and the strength is less likely to be uneven. Therefore, the quality of the concrete frame is also improved.

  Furthermore, since the air injected into the expansion / contraction member 5 has a thermal conductivity that is significantly lower than that of metal, it is difficult for the heat of the concrete frame to escape to the outside. In addition, since the compressor at the site can be used, it is easy to manage and handle. Even if the air is exhausted after the construction is completed, the site environment is not adversely affected. But it ’s excellent.

  In addition, in the steel mold apparatus of this embodiment, the vertical butter material does not exist on both sides of both ends (the left and right ends in the longitudinal direction in FIGS. 2 and 4) of the back surface 1 a of the steel mold 1. For this reason, even if the expansion / contraction member 5 is provided in these ranges, there is a possibility that the expansion / contraction member 5 may come off the steel mold 1. Therefore, although the expansion / contraction member 5 is not provided, an example in which the heat insulating material 43 as a heat retaining member is provided in the recess between the ribs formed on the back surface 1a of the steel mold 1 has been described. If the member 5 does not come off from the steel mold 1, the expansion / contraction member 5 may be provided at both ends. In this case, instead of the heat insulating material 43 which is a heat retaining member, the above-described sheet-like curing member is used. Of course.

  Next, an embodiment of construction using the steel formwork apparatus after assembly of the present invention will be described.

<< One Embodiment of Steel Formwork after Assembly >>
Fig.5 (a) is a top view which shows one Embodiment of the construction using the steel formwork apparatus of this invention, FIG.5 (b) and FIG.5 (c) are A parts in the same top view, respectively. It is an expanded sectional view which shows a B part. 6 and 7 are a side view and a front view of the embodiment shown in FIG. 5, respectively.

  The steel formwork apparatus shown in FIGS. 5 to 7 is an embodiment showing construction in the case of constructing a concrete wall such as a mid-to-high-rise condominium, and a pair of opposing steel formwork is respectively divided by the thickness of the concrete wall. It is assembled in a state where it is only spaced apart.

  Here, as described above, in the steel formwork apparatus of the present embodiment, the plurality of vertical butter materials 2 are predetermined along the horizontal direction of the steel formwork 1 on the back surface 1a side of the steel formwork 1. A plurality of horizontal butter materials 3 are formed on each vertical butter material 2 with a gap of about several centimeters passing through the contracted expansion / contraction member 5 with respect to the back surface 1a. Each of the openings 21 is inserted and fixed.

  And as shown in FIG.5 (b), between the some vertical-batter material 2 in the back surface 1a side of the steel formwork 1, the heat_generation | fever sheet | seat 41 which generate | occur | produces heat by electricity supply, and the heat insulation sheet | seat 42 which interrupts | blocks heat are included. In an overlapped state, it is fixed to the steel mold 1 by an expansion / contraction member 5 that is inflated by injecting a fluid.

  On the other hand, on the back surface 1a of the steel mold 1, on the outer side of the outermost vertical butterfly material 2 positioned on both ends, as shown in FIG. 43 is fitted in the recess between the ribs. Here, the two heat insulating materials 43 are fitted in a stacked state, but need not be two.

  As shown in FIGS. 6 and 7, the vertical butterfly member 2 is provided with a hanging eyebolt 62 at an appropriate position at the upper end, and a screw jack for height adjustment (see FIG. 6) at an appropriate position at the lower end. Not shown.) Is attached. The steel mold 1 is hung at a predetermined installation position by a crane (not shown) using an eyebolt 62 in a state where flatness is secured by the vertical butterfly material 2 and the horizontal butterfly material 3, Height adjustment and horizontal adjustment are performed using a screw-type jack (not shown), and it is erected at a predetermined position.

  In addition, as shown in FIG. 7, the standing steel formwork 1 is configured such that the support 63 for erection adjustment fixed to the slab concrete 61 via the anchor bolt 63 a is supported on the upper part of the vertical butter material 2. It is fixed so that it can withstand the lateral pressure of concrete placed between the steel molds 1 and the horizontal load during work. In FIG. 7, 64 is a width determining material for determining the width between the opposing steel molds 1, and 65 is a separator. The width determining material 64 determines the distance between the opposing steel molds 1, and The steel molds 1 are fastened and fixed by a separator 65. Reference numeral 66 denotes a mounting bracket for fixing the horizontal butterfly material 3 to the vertical butterfly material 2, and 67 and 68 denote the interval between the opposing vertical butterfly materials 2, that is, the interval between the steel molds 1. It is a support member and a fastening bolt for holding. In FIG. 7, the erection adjustment support 63 is provided only on the steel mold 1 on the right side in the figure, but is actually provided on both sides.

As described above, the steel formwork apparatus of the present embodiment is assembled, and concrete is placed between the opposing steel formwork 1. After placing the concrete, the heating sheet 41 is energized at a low temperature such as in winter, while the concrete is cured without energizing the heating sheet 41 at a high temperature in summer. As a result, the concrete frame can be cured while always maintaining the optimum concrete curing temperature throughout the year, so that the compression strength when demolding the placed concrete is 10 N / mm ² or more. It is possible to remove the mold within the planned number of days without increasing the period until the initial strength, ie, the period until the initial strength of the concrete is developed.

  Therefore, according to the steel mold apparatus of the present invention, as a means for fixing the curing members such as the heat generating sheet 41 and the heat shielding sheet 42 to the back surface 1a of the steel mold 1, the expansion and contraction that expands and contracts by entering and exiting the fluid is performed. Since the member 5 is adopted, there is no need to use a metal fixed hardware or magnet as in the prior art, and a heat insulating material is provided between all the ribs formed on the back surface 1a of the steel mold 1. The operation | work which inserts curing members, such as, becomes unnecessary. Therefore, the curing member can be fixed to the back surface 1a of the steel mold 1 with good workability, low cost, and efficiency.

  Even when the heat generating sheet 41 and the heat shielding sheet 42 are fixed to the back surface 1 a of the steel mold 1, the expansion / contraction member that is in an expanded state by the fluid has elasticity, so the heat generated in the heat generating sheet 41 is generated. The body (heating body) 41a, wiring, etc. can be fixed without damaging them. Furthermore, since the heat generating sheet 41 is uniformly pressed against and fixed to the back surface 1a of the steel mold 1 by the expansion / contraction member 5, the solidified state of the concrete becomes almost uniform, and unevenness in strength is less likely to occur. Therefore, the quality of the concrete frame is also improved.

  Further, in this embodiment, the air injected into the expansion / contraction member 5 has a heat conductivity significantly lower than that of metal and high heat insulation (heat insulation), so the curing member is fixed with a metallic fixed hardware or magnet. It is harder for the heat of the concrete frame to escape to the outside. In addition, since the compressor at the site can be used, it is easy to manage and handle. Even if the air is exhausted after the construction is completed, the site environment is not adversely affected. But it ’s excellent.

  From the above, according to the steel formwork apparatus of the present invention, the heatability and heat retention are improved as compared with the prior art, especially in formwork construction in a low temperature environment such as winter and cold districts. It becomes possible to prevent the initial frost damage of the installed concrete and to promote the strength development in the initial curing of the concrete. The standard value of compressive strength when demolding the placed concrete was changed in accordance with the revision of “Standard Specification for Building Work / Same Explanation JASS5 Reinforced Concrete Work”. Since the concrete can be cured efficiently and the quality is improved, it is possible to remove the mold in a predetermined period without extending the period of time for the formwork.

  In the present embodiment, as a curing member that is pressed against and fixed to the back surface 1a of the steel mold frame 1 by the expansion / contraction member 5 between the plurality of vertical flap members 2 on the back surface 1a side of the steel mold frame 1, Although the heat generating sheet 41 and the heat shielding sheet 42 have been described as examples, these curing members do not have to be sheet-like, for example, rectangular tiles (blocks such as the heat insulating material 43 shown as the heat retaining member) ).

  Moreover, although this embodiment demonstrated the example which provided the heat generating sheet 41 between the some vertical flap materials 2 in the back surface 1a side of the steel formwork 1, the heat generating sheet 41 was used for the surface 1b of the steel formwork 1. You may provide in the side, ie, the concrete casting surface side. At this time, only the heat insulating sheet 42 or the heat insulating material 43 or the heat insulating sheet and the heat insulating sheet 42 may be provided between the vertical flaps 2 on the back surface 1 a side of the steel mold 1.

  Furthermore, in the present embodiment, the construction in the case of constructing a concrete wall such as a mid-to-high-rise apartment has been described as an example, but the steel formwork apparatus of the present invention is not limited to this, for example, a retaining wall or Needless to say, the present invention can also be applied to reinforced concrete structures such as piers and waterways.

DESCRIPTION OF SYMBOLS 1 Steel formwork 1a Back surface 1b Surface 2 Vertical flap material 21 Opening part 3 Horizontal flap material 41 Heat generating sheet (heating member / curing member)
42 Heat shield sheet (heat shield member / curing member)
43 Insulation (heat insulation and curing materials)
5 Air tube (expansion / contraction member)

Claims (3)

A steel mold in which a plurality of vertical butter materials are joined to the back surface side at predetermined intervals along the horizontal direction, and a plurality of horizontal butter materials are fixed to the vertical butter material along the material axis direction, respectively. A steel formwork apparatus for constructing a concrete frame using a frame,
The plurality of horizontal butter materials are fixed to the plurality of vertical butter materials in a state having a gap with respect to the back surface of the steel mold,
While providing a concrete curing member between the plurality of vertical flaps in the gap,
An expansion / contraction member that expands / contracts by entering and exiting the fluid is provided between the curing member and the plurality of horizontal flap materials,
The curing member is pressed against and fixed to the back surface of the steel mold by expansion of the expansion / contraction member,
The steel formwork apparatus characterized by the above-mentioned. The steel mold apparatus according to claim 1, wherein
The fluid is air;
The steel formwork apparatus characterized by the above-mentioned. In the steel mold apparatus of Claim 1 or Claim 2,
The curing member is
Including any one or more of a heat generating member, a heat retaining member, and a heat shield member,
The steel formwork apparatus characterized by the above-mentioned.

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