JP2000136589A - Placing type concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a wire living space in forming e.g. a wall by making the thickness of the wall as thin as possible for reducing the number of part items for cost reduction. SOLUTION: A form member 2 is provided having a sheathing board part 4 for blocking placed concrete at its back and a projecting retainer engagement part 6 provided on the back of the sheathing board part 4 and adapted for engaging a retainer retaining the interval between the back of the sheathing board part 4 and another form. The form member 2 meets the expression: E/h>=1.5×103 where E is the modulus of bending elasticity (kgf/cm2) of the form member 2 and (h) is the thickness (cm) of the form member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete concrete form which is used for driving concrete, that is, for driving concrete, and is used in a state of being embedded in concrete without being detached after driving.

[0002]

2. Description of the Related Art Conventionally, for example, in the construction of a concrete wall of a reinforced concrete building, a concrete formwork is built in. Attaching a thick timber. A concrete is removed. Each process consisting of attaching, repairing, and finishing is required. Such a large number of steps is one of the factors that hinder the labor saving of the concrete wall construction, the shortening of the construction period, and the cost reduction.

Therefore, in recent years, heat insulating materials or non-combustible
A so-called pour-type concrete form has been developed which is formed by using a heat insulating material and is embedded in concrete at the time of placing concrete. By using this formwork, it is possible to omit the construction process of the concrete wall and to reduce the cost.

[0004] As this type of conventional cast-in-place concrete formwork, there is a form in which a dam is formed by using a heat insulating material or a non-combustible heat insulating material instead of plywood, and a crosspiece is attached to the dam. Are known. After the concrete is cast, this mold is in a state in which the heat insulating material or non-combustible / heat insulating material surface of the form is provided on the concrete wall surface. Can be omitted.

[0005] However, the above-mentioned conventional construction requires the steps of attaching and detaching the crosspiece and attaching and detaching the thick ends, which is insufficient in terms of labor saving and shortening the construction period.

[0006] A concrete type formwork which solves such a problem is disclosed in, for example, JP-A-10-121.
As disclosed in Japanese Patent Application Laid-Open No. 614 or Japanese Patent Application Laid-Open No. H10-112485, there has been known one formed of a synthetic resin foam having a heat insulating function, such as styrene foam, without using a crosspiece. This formwork can withstand the lateral pressure during concrete casting without using thick ends,
The product thickness and separator position are devised. By embedding the styrene foam formwork in the concrete wall at the time of casting concrete, it is possible to omit a construction process from attachment of the thick material and removal of the thick material to spraying of urethane.

[0007] However, in the case of the cast-in-place concrete form made of the synthetic resin foam, for example, Japanese Patent Application Laid-Open No.
As shown in FIG. 9 of No. 121485, a hole is formed at the time of use, and an iron pipe or the like is passed through this hole,
A pair of driven concrete forms are held at predetermined intervals. That is, there is a problem that post-processing such as formation of the above holes is necessary when using, and the embedding is troublesome.

[0008] On the other hand, as a drive-in type concrete form which has solved such a problem, a drive-in type concrete form shown in FIGS. 12 (a) to 12 (c) is known. This formwork is a styrene foam weir plate 1 shown in FIG.
1 and the joiner 102 shown in FIG.
2C, a retainer 103 formed by bending a metal bar into a U-shape. For example, two dams 101 are provided to face each other, and the joiner 102 is
Fit into. The retainer 103 is fitted in the fitting hole 102a of the joiner 102 fitted in the weir plate 101, and holds the weir plates 101 at a predetermined interval. Such a drive-in type concrete formwork does not require the above-described post-processing when used, and is easier to lay than the drive-in type concrete formwork.

[0009]

However, in the above-mentioned conventional cast-in-place concrete formwork, the number of components is increased, and an operation for fitting the joiner 102 to the dam board 101 is required. As a result, for example, there is a problem in that the number of man-hours required for installing a drive-in concrete formwork for forming a wall is increased, which leads to an increase in cost.

In particular, in the above-mentioned conventional cast-in-place concrete formwork, the weir plate 101 is made of styrene foam and has low rigidity. For this reason, it is necessary to disperse the concrete placing pressure. In this case, joiner 102
Is small, the concrete placing pressure applied between the weir board 101 and each joiner 102 becomes large. Also, if the strength of the connecting portion between the weir plate 101 and the joiner 102 is weak, when the number of the joiners 102 is small,
The connecting portion cannot withstand the concrete placing pressure. As a result, it is impossible to avoid a situation in which the number of joiners 102 is increased in the above-described conventional concrete concrete formwork.

[0011] Further, in the above-described conventional concrete type formwork having a styrene foam weir board 101,
In order to obtain the desired rigidity of the crest plate 101,
Must be thicker. As a result, when a wall is formed by using the driven-in concrete formwork, there is a problem that the thickness of the wall is unnecessarily thick and the living space is narrowed.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a drive-in type concrete formwork according to the present invention comprises a dam plate portion for damping the poured concrete on the back side, and a back surface of the dam plate portion. A formwork member having a convex retainer engaging portion for engaging a retainer for maintaining a space between the back surface of the weir plate portion and another formwork, and a bending elasticity of the formwork member. Assuming that the rate (kgf / cm ² ) is E and the thickness (cm) of the form member is h, the form member satisfies the formula of E / h ≧ 1.5 × 10 ^3. It is characterized by:

According to the above construction, on the back surface of the weir plate portion,
Since a convex retainer engaging portion for engaging a retainer for maintaining a gap between the back surface of the weir plate portion and another mold is formed, a separate retainer engaging portion such as a joiner is formed. Is unnecessary. As a result, the number of parts can be reduced, and for example, the number of work steps required when erection of a driven concrete formwork for forming a wall can be reduced, and an increase in cost can be suppressed.

Further, the flexural modulus of the form member (kgf / c
m ² ) is E, and the thickness (cm) of the form member is h.
Since the formwork member is made of a material satisfying the formula of E / h ≧ 1.5 × 10 ³ , the deflection of the dam portion during concrete casting is reduced, and for example, when a wall is formed, the thickness of the wall is reduced. It can be made as thin as possible to secure a large living space.

[0015] In the above-mentioned cast-in-concrete formwork, the formwork member is further provided on a back side of the weir plate part, and has a reinforcing rib having a predetermined height in a direction protruding from the back surface of the weir plate part. May be provided.

According to the above configuration, the reinforcing rib having a predetermined height is formed on the back side of the weir plate portion in the direction protruding from the back surface of the weir plate portion, so that the thickness of the weir plate portion is reduced. The thickness can be further reduced. Further, even when a material having high strength and having a larger weight than, for example, a resin foam is used, an increase in the weight of the formwork member can be suppressed.

In the above-mentioned concrete concrete form, each part of the form member may be formed of the same material.

According to the above construction, since each part of the form member, for example, the weir plate portion and the reinforcing rib, or the weir plate portion, the reinforcing rib and the retainer engaging portion are formed of the same material, The mold member can be integrally and easily formed by, for example, a resin molding technique. In this case, the connection strength between the weir plate portion and the retainer engaging portion can be increased. As a result, the number of formed retainer engaging portions can be reduced, and the number of man-hours for engaging the retainer with the retainer engaging portion during the installation of the driven concrete formwork can be reduced.

In the above-mentioned concrete concrete form, the reinforcing rib may be formed in a frame shape along the outer shape of the weir plate.

According to the above configuration, since the reinforcing ribs are formed in a frame shape along the outer shape of the weir plate, the weir plate can be reinforced by the reinforcing ribs. As a result, it is possible to obtain a castable concrete formwork that is lightweight and has high strength.

In the above-mentioned concrete concrete form, the heat transmission coefficient of the weir plate portion is 0.5 W / m ² · K or more and 10 W or more.
/ M ² · K or less.

According to the above construction, since the heat transmission coefficient of the weir is within the range of 0.5 W / m ² · K or more and 10 W / m ² · K or less, the form member, that is, the cast concrete The formwork can have a good insulation function.

[0023] In the above-mentioned concrete concrete form, the weir plate portion may have an air layer inside.

According to the above configuration, since the weir plate portion has an air layer inside, the form member, that is, the cast-in-form concrete form can have a good heat insulating function.

[0025] The above-mentioned cast-in-place concrete formwork may be provided with a heat insulating material provided on at least one of a front surface and a back surface of the weir plate portion of the formwork member in addition to the formwork member.

According to the above construction, since the heat insulating material is provided on at least one of the front surface and the rear surface of the weir, the form member, that is, the cast-in concrete form, has a good heat insulating function. Can be.

[0027] The above-mentioned cast-in-place concrete formwork may be provided with a fireproof material provided on at least one of the front surface and the back surface of the damping plate portion of the formwork member in addition to the formwork member.

According to the above construction, since the fireproofing material is provided on at least one of the front surface and the back surface of the weir plate portion, the form member, that is, the cast-in concrete formwork has a good fireproof function. Can be.

[0029] The above-mentioned cast-in-place concrete formwork may be configured so that the thickness of the formwork member is in the range of 10 mm or more and 45 mm or less.

According to the above configuration, for example, when a wall is formed, the wall can be made as thin as possible to secure a large living space.

[0031] The above-mentioned cast-in-concrete formwork has a structure in which a fitting portion is formed on the outer surface of the form member so that the outer surfaces of the form members arranged adjacent to each other can be fitted to each other. It may be.

According to the above configuration, it is possible to prevent misalignment at the time of embedding of the cast-in type concrete formwork and to prevent outflow of slack.

[0033] The above-mentioned concrete concrete form may be configured such that the same material is polypropylene.

According to the above configuration, a high-strength form member, that is, a cast-in concrete form can be obtained.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 (a) (b)
As shown in FIG.
Has a form member 2 constituting the main body of the driven concrete form 1. On the surface 2a of the mold member 2,
As shown in FIG. 1B and FIG. 2 which is a cross-sectional view taken along the line AA in FIG. 1A, a calcium silicate plate 3 as a fireproof material is adhered.

The form member 2 includes a weir plate portion 4 and a frame plate-like rib 5.
(Reinforcing ribs) and a retainer engaging portion 6. The weir plate portion 4 constituting the flat plate portion of the mold frame member 2 has a rectangular plate shape, and as shown in FIG. 2, has a hollow portion 4a inside for obtaining a heat insulating function. In this hollow part 4a,
A rib structure portion 4b is provided to secure the strength of the form member 2.

The back surface 2b of the form member 2 has
A frame plate-like rib 5 having a shape rising from a predetermined height is formed. The frame plate-like rib 5 has a rectangular frame shape corresponding to the outer shape of the weir plate portion 4 and is formed along the entire outer periphery of the weir plate portion 4. This frame plate-shaped rib 5
The baffle plate portion 4 is reinforced.

A large number of projecting retainer engaging portions 6 are provided at positions inside the frame plate-like ribs 5 on the back surface 2b of the form member 2. As shown in FIG.
As shown in FIG. 3, three retainer fitting holes 6a for fitting the ends of the retainer 21 (see FIG. 3A) are formed. The retainer engaging portion 6 is located at a position along each inner surface of two opposing sides in the longitudinal direction of the frame plate-like rib 5,
In addition, a plurality of the frame members 2 are arranged side by side at predetermined intervals in the longitudinal direction of the form member 2 at an intermediate position between the two side portions.

The concrete concrete form 1 is shown in FIG.
They are connected by a retainer 21 shown in FIG. As shown in the figure, when the two frame members 2, 2 are arranged in a state where the back surfaces 2b face each other, the retainer 21 sets the distance between the two frame members 2, 2 at a predetermined distance. Is to be held. At this time, one end of the retainer 21 is fitted into the retainer fitting hole 6a of the retainer engaging portion 6 of one mold member 2, and similarly, the other end is connected to the retainer engaging portion of the other mold member 2. Retainer fitting hole 6 of joint 6
a.

FIGS. 3 (a) and 3 (b) show how to use the concrete casting formwork 1 in the above configuration. In addition, in the same figure, for simplification of description, an example in which only two cast-in concrete forms 1 are used is shown,
In practice, a number of drive-in concrete forms 1 are used, for example, to form walls.

When using the concrete concrete form 1, for example, as shown in the figure, two concrete concrete forms 1 are arranged so that the back surfaces 2 b of the form members 2 face each other. These both driven concrete forms 1 are connected by a retainer 21. At this time, one end of the retainer 21 is fitted into the retainer fitting hole 6a of the retainer engaging portion 6 in one of the driven concrete forms 1, and
Similarly, the other end is fitted into the retainer fitting hole 6a of the retainer engaging portion 6 of the other driven concrete formwork 1. Thereby, the double-cast concrete form 1
1 is held at a predetermined interval without falling inward and outward in the facing direction of the two.

In this state, when concrete is driven between the two driven concrete forms 1 and 1,
Each retainer 21 is completely buried in the concrete, and the driven concrete form 1 is also buried in the back side of the concrete.

In the concrete casting formwork 1, it is not necessary to provide a crosspiece in the formwork member 2 at the time of concrete casting, and it is not necessary to use thick ends. Also, it is not necessary to remove the mold, and it is not necessary to spray urethane or paste a gypsum board. Therefore, the execution step can be largely omitted.

As shown in FIG. 1 (a), the direction in which the retainer fitting hole 6a is drilled is
May be set to be parallel to the longitudinal direction of
Further, it may be set so as to be parallel to the width direction of the mold member 2. The former generally refers to the case where the driven concrete formwork 1 is built vertically, and the latter refers to the case where the driven concrete formwork 1 is built horizontally. The distance between the retainer engaging portions 6 is arbitrary, and is determined by, for example, the concrete placing pressure. In addition, if the distance between the retainer engaging portions 6 is small, the number of the retainer engaging portions 6 increases, which results in that much time is spent connecting the driving-type concrete forms 1 by the retainer 21. On the other hand, if it is wide, the concrete casting pressure causes the form member 2, that is, the weir plate portion 4 to bend. In this case, the smoothness of the surface of the weir plate portion 4 is lost.

Further, the weir plate portion 4, the frame plate-like rib 5, and the retainer engaging portion 6 constituting the form member 2 may be formed by integral molding. For example, the retainer engaging portion 6 is formed separately. However, it may be joined to the weir plate portion 4 with an adhesive or a nail.

When the weir plate portion 4, the frame plate-like ribs 5, and the retainer engaging portion 6 are formed of the same material, it is easy to integrally form them. The connection strength with the part 6 can be increased. As a result, the number of the formed retainer engaging portions 6 can be reduced, and the man-hour for engaging the retainer 21 with the retainer engaging portions 6 when the driven concrete formwork 1 is erected can be reduced.

Retainer fitting hole 6a of retainer engaging portion 6
May be perforated at the same time when the mold member 2 and the retainer engaging portion 6 are formed, or may be perforated by post-processing. The shape of the retainer fitting hole 6a depends on the cross-sectional shape of the retainer 21 to be used, but is generally substantially circular from the viewpoint of easy insertion of the retainer 21 (round bar shape).
In addition, the number of the retainer fitting holes 6a formed in one retainer engaging portion 6 is arbitrary, and is not particularly limited.

On the other hand, the heat insulation performance of the cast-in-place concrete form 1 according to the present invention is as follows: from the viewpoint of heat insulation, the heat transmission coefficient of the weir plate portion 4 is 0.5 W / m ² · K or more and 10 W / m ² · K or less. It is preferably within the range. Heat transmissibility is crest plate part 4
Is determined by the heat conductivity and the thickness of the concrete form 1. As a configuration for improving the heat insulation performance of the castable concrete form 1, a material having a low heat conductivity can be selected as the material of the weir board 4, And the like.

As another structure for improving the heat insulating performance of the weir plate portion 4, it is effective to provide an air layer 4c as shown in FIG. In addition, the concrete form 1
Then, as shown in FIG. 2, the cavity 4a as an air layer
Is provided. The method for providing the air layer 4c is not particularly limited. For example, the box-shaped weir plate portion 4 may be formed by bonding two plates. In addition, weir board section 4
The material may be resin, and the air layer 4c may be provided inside the damping plate portion 4 by foam molding or hollow molding. When the foam molding is performed, the air layer 4c is formed of a foam. With respect to imparting heat insulating performance by foam molding and hollow molding, the thermal conductivity of the weir plate portion 4 is reduced, and the thickness of the weir plate portion 4 is increased at the same weight, so that it becomes easier to secure a necessary thickness. In addition, it is not necessary to use a special method for each molding method of the form member 2,
There is no problem with a general method.

The cast-in-concrete formwork 1 is provided with a heat insulating material 9 on the surface 2a of the formwork member 2 as shown in FIG. 6 (a), and a fireproof material as shown in FIG. In the example of FIG. 6, a calcium silicate plate 3) is provided, or FIG.
As shown in (a), the provision of the fire / insulation material 10 can provide a heat insulation function, a fire prevention function, or both. In addition, the heat insulating material 9, the fire protection material and the fire protection / heat insulating material 1
The bonding surface of the form member 2 to which the bonding material such as 0 is bonded is not limited to the front surface side, and may be the rear surface side. Further, the above-mentioned adhesive material may be attached to the front surface 2a and the back surface 2b of the form member 2. Further, the adhesive material on the front surface 2a and the adhesive material on the back surface 2b may be the same. Further, for example, the adhesive material on the front surface 2a may be different from a fireproof material, and the adhesive material on the rear surface 2b may be a heat insulating material. That is, the bonding surface of each bonding material and the material of the bonding material may be determined according to the use purpose and the required function. Further, as shown in FIG. 6B, an air layer 4c is provided on the weir plate portion 4 and the surface 2
A heat insulating material 9, a fireproof material or a fireproof / heat insulating material 10 may be attached to “a”. It should be noted that the cast-in concrete formwork 1 in which a fire protection function is imparted to the surface of the formwork member 2 is mainly used for the outer wall surface of a concrete building.

[0051] In the concrete frame 1 with a sticking material provided with a sticking material such as the above-mentioned heat insulating material 9, fireproof material (for example, calcium silicate plate 3) or fireproof / heat insulating material 10 in advance. It has such advantages.

A) It is possible to produce a driving-type concrete form 1 with a sticking material at a factory. For example, as compared with a case where the setting material is provided on the driving-type concrete form 1 at a construction site, A high-quality cast-in-place concrete formwork 1 can be easily obtained.

That is, in the case where the driving-in type concrete formwork 1 with a sticking material is manufactured at a factory, the state of attachment of the sticking material to the driving-in type concrete formwork 1 is uniform, and a high-quality driving-in type mold with a sticking material is used. The concrete form 1 can be obtained. Further, the attachment of the adhesive material to the driving-type concrete formwork 1 can be performed at the same time, for example, when the form member 2 is formed by a mold, and the production of the driving-type concrete formwork 1 with the adhesive material is easy. Becomes On the other hand, when the sticking member is stuck on site, the sticking operation is troublesome, and the sticking state tends to be uneven.

B) When the cast-in type concrete form 1 is provided with a form member 2 having high rigidity, the form member 2 is transported by, for example, an adhesive material provided on the surface thereof during transportation or concrete pouring. Can be protected from damage.

Examples of the material having the fire prevention and heat insulation functions include inorganic heat insulation and heat insulation materials such as rock wool and phenol resin foams. It is preferable that the shape of the material is basically plate-like in view of workability. Further, as the fireproof material, there are many silicate compounds, for example, calcium silicate and the like, and it is preferable that the fireproof material has a plate shape like the fireproof / heat insulating material. Also, as insulation,
Examples include urethane foam, styrene foam, polyethylene foam, phenol foam, insulation board, and sheathing board.

The method of attaching the heat-insulating material 9, the fire-proof material or the fire-protecting / heat-insulating material 10 is not particularly limited. That is, these adhesive materials may be attached after the form member 2 is manufactured, or may be attached when the form member 2 is manufactured.

Here, the fireproof material will be described. According to the Building Standards Law, the fireproof material, that is, the fireproof material is classified into four grades of non-combustible material, quasi-non-combustible material, flame-retardant material and quasi-flame-retardant material, and is certified. These are defined as follows.

Non-combustible material A non-combustible material is a material which does not generate harmful cracks, melting, deformation, etc. in combustion or fire prevention in a normal fire and does not generate harmful smoke or gas in fire prevention. At home,
It has the highest fire protection performance and has passed the strictest of several fire protection material tests (fire protection material qualification tests). This includes materials such as concrete, brick, roof tile, asbestos slate, steel, aluminum, glass, mortar, and plaster.

Quasi-noncombustible material A quasi-noncombustible material is a material having a fire protection performance equivalent to that of a noncombustible material. It hardly burns in a normal fire, generates little smoke and gas, and has a harmful crack in fire prevention. It is a material that does not cause melting, deformation, etc. These include wood wool cement boards, gypsum boards, and other materials specified by the Minister of Construction. Most of the materials are made of non-burnable inorganic materials, so they do not spread fire by burning. .

Flame-retardant material A flame-retardant material is a material made of wood or plastic, which is originally flammable, made less flammable by adding a special agent or covering it with a metal plate. With The combustion in the early stage of the fire is small,
It is a material that hardly generates harmful cracks, melting, deformation, etc., which generate a large amount of smoke or gas that affects human life and hinders evacuation. Flame-retardant plywood, flame-retardant fiberboard, and flame-retardant plastic boards are representative materials that have been certified.

Semi-flame-retardant material The semi-flame-retardant material is inferior in performance to the flame-retardant material in that it generates a large amount of smoke and gas and melts in the event of a fire, but is less flammable like the flame-retardant material Material. The quasi-flame-retardant materials include a polycarbonate plate, a glass fiber reinforced polyester plate, and a hardened vinyl chloride plate.

Tables 1 and 2 show specific examples of the above fire prevention materials.

[0063]

[Table 1]

[0064]

[Table 2]

The flexural modulus E (kgf
/ Cm ² ) and h (cm) of the mold member 2 (FIG. 6A)
(Refer to (b))) is to reduce the deflection of the formwork member 2, that is, the dam plate portion 4 at the time of concrete casting, and to make the thickness (wall thickness) of the wall to be formed as thin as possible in the living space. It is desirable to satisfy the following equation from the viewpoint of increasing When the form member 2 has the frame plate-shaped ribs 5 and the retainer engaging portions 6, the thickness h is a thickness including these and the weir plate portions 4.

E / h ≧ 1.5 × 10 ³ The thickness (form) of the mold member 2 is preferably in the range of 10 mm or more and 45 mm or less from the viewpoint of making the wall thickness as thin as possible.

Here, a concrete formwork 1 made of glass fiber-containing polypropylene (hereinafter referred to as a polypropylene formwork), having the same shape as the formwork 1 and expanded polystyrene (expansion ratio about 30 times) The results of comparison with a comparative cast-in concrete formwork (hereinafter referred to as a foamed polystyrene formwork) comprising: The polypropylene mold has a hollow layer having a thickness of 1 mm in the weir plate portion 4.

When the bending elastic modulus E, E / h, and bending stiffness EI of a 0.5 cm thick polypropylene mold were examined, the results were as follows. In addition,
I is the second moment of area determined from the shape of the polypropylene mold, and the flexural modulus E is the flexural stiffness EI.
Is divided by the second moment of area I. The bending stiffness EI can be obtained by directly measuring the mold or by simulation.

(Thickness 0.5 cm) E = 44640 kgf / cm ² E / h = 89280
EI = 23250 Whereas the thickness or h is 0.5 cm and 5
cm of the foamed polystyrene mold having a flexural modulus E
/ H and bending stiffness EI were as follows.

(Thickness 0.5 cm) E = 60 kgf / cm ² E / h = 120
EI = 31.25 (thickness 5 cm) E = 60 kgf / cm ² E / h = 12
EI = 31250 From the above results, the conventional expanded polystyrene mold was
/ H is a value sufficiently smaller than 1.5 × 10 ³ . In addition, the polypropylene mold that satisfies E / h ≧ 1.5 × 10 ³ has a sufficiently high EI even when the thickness is small as compared with the conventional foamed polystyrene mold. In addition, the deflection with respect to the concrete pouring pressure during concrete pouring is reduced. Thereby, if a polypropylene mold is used, a concrete structure with less deformation can be obtained. This point is due to the fact that E / h (E / h ≧ 1.5) is larger than the conventional expanded polystyrene mold.
The same applies to the case of using a cast concrete form 1 of × 10 ³ ).

Here, the second moment of area I and the bending stiffness EI will be described.

First, the second moment of area I will be described. As shown in FIG. 7, when a minute area dA is taken in an arbitrary plane figure and a distance between the minute area and the x axis is y, y ² dA is called a second moment of the minute area dA about the x axis. The sum of these quantities for the entire area of the plane figure is used to calculate the second moment of area (mome
nt of inertia of area). This is denoted by I _X ,
A quantity having a dimension of the fourth power of length, and is expressed by the following equation.

I _X = ∫y ² dA (1) Similarly, the second moment of area I _y about the y-axis is I _y = ∫x ² dA (2) The sectional form can be expressed by an algebraic equation. If possible, the second moment of area is determined analytically.

Now, passing through the rectangular centroid C shown in FIG.
A second moment of area about the x-axis parallel to one side is obtained. Considering a micro area with a micro width dy at a position y away from the axis, the second moment of area _{IX with} respect to the x axis passing through the centroid C is as follows.

[0075]

(Equation 1)

Here, Tables 3 and 4 show examples of cantilever beams and both-end supporting beams, respectively, and the deflection angle and the maximum deflection thereof. The relationship between the bending stiffness EI and the difficulty in bending the beam is clear from the examples in both tables.

[0077]

[Table 3]

[0078]

[Table 4]

Further, in the concrete concrete form 1, the frame plate-like ribs 5 of the form member 2 have a concave-convex shape so that the adjacent concrete concrete forms 1 and 2 can be fitted together. It may be something. This uneven shape is
For example, FIGS. 9A and 9B are cross-sectional views taken along line BB in FIG. 9A, and FIG. 9C is a cross-sectional view taken along line CC in FIG. 9A. 10 (a) which is an enlarged view of a portion E in FIG. 9 (b), and FIGS. 10 (b), 11 (a) and 11 which are enlarged views of an F portion in FIG. 9 (b).
This is shown in FIG. FIG. 10C is an enlarged view of a portion G in FIG. 9B, and FIG. 10D is a cross-sectional view taken along line DD in FIG. 10C. That is,
The form member 2 has a protruding portion 5a (fitting portion) that is continuous on the outer surface of one side in the longitudinal direction of the frame plate-shaped rib 5 and one side in the width direction that is continuous with this side. A concave portion 5b (fitting portion) is provided on the outer surface of the other side in the width direction and the other side in the width direction continuous with this side.

As described above, the projecting portion 5a and the recessed portion 5b, which enable the adjacently arranged driving-type concrete forms 1.1 to be fitted to each other, are formed in the frame plate-shaped rib 5, so that
It is possible to prevent misalignment at the time of embedding the cast-in concrete formwork 1 and to prevent outflow of flax. In addition, even when the frame member 2 does not have the frame plate-shaped ribs 5, it is possible to form an uneven shape on the outer surface of the frame member 2.

The retainer engaging portion 6 of the form member 2
As shown in FIG. 10D, the diameter of the end of the retainer fitting hole 6a on the side where the retainer 21 is fitted is large. This is because the retainer 2 is inserted into the retainer fitting hole 6a.
This is for facilitating the fitting of No. 1.

The material used for forming the mold member 2 is not particularly limited, but a resin material is preferably used in view of productivity and processability, and a thermoplastic resin is particularly often used. Examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, ABS resin, polyimide, general thermoplastic resins such as polycarbonate, modified polymer alloys thereof, and mixtures thereof. Is preferably used. When polypropylene is used, a high-strength form member 2, that is, a cast-in concrete form 1 can be obtained.

A reinforcing material such as a reinforcing fiber or an inorganic particle filler is blended with such a thermoplastic resin to improve the strength and the elastic modulus. Examples of the reinforcing fiber include an inorganic fiber such as a glass fiber, a carbon fiber, and an alumina fiber and an organic fiber such as a Kepler, and an inorganic fiber, particularly, a glass fiber is preferably used. The length of the reinforcing fiber is 0.1 to 50
mm, preferably in the range of 0.5 to 15 mm. The fiber diameter is in the range of 1 to 50 μm, preferably 1 to 20 μm. Examples of the inorganic particle filler include whiskers such as potassium titanate and various conventionally known reinforcing fillers such as talc and wollastonite.

The reinforcing fibers and the inorganic particle filler as the reinforcing material may be used alone or in any combination. The amount used depends on the type of reinforcing material used, but is generally 5 to 50 as a content in the thermoplastic resin composition.
%, Preferably in the range of 10 to 40 weight%. If the content is lower than this range, it is difficult to obtain a sufficient reinforcing effect, while if it exceeds this range, there is a problem in molding.

The method for manufacturing the concrete form 1 (form member 2) is not particularly limited, and may be manufactured in the same manner as a normal concrete form made of plywood. It may be manufactured by bonding with a nail or an adhesive. When the material is a resin, for example, a thermoplastic resin, it may be a usual thermoplastic resin molding method, and can be manufactured by, for example, a hot pressing method.

As shown in FIGS. 3 (a) and 3 (b), it is preferable that the driven concrete form 1 is used so that the two driven concrete forms 1 form a pair. , Can be used in pairs with other molds.

In each of the cast-in concrete forms 1 having the air layer 4c (including the cavity 4a),
Although the ratio of the volume of the air layer 4c to the whole of the weir plate 4 is set to approximately 20 to 95%, this ratio is appropriately determined according to the heat transmission coefficient of the weir plate 4, the thickness of the weir plate 4, and the like. Can be changed.

For example, in the concrete concrete form 1 having the air layer 4c (including the cavity 4a) shown in FIGS. 2, 5 and 6B, FIG.
As shown in (a) to (c), a foamed resin layer 11 may be formed as an air layer.

The foamed resin layer 11 may be made of the same material as the material of the weir plate portion 4 (the mold member 2), or may be made of a material different from that of the weir plate portion 4. In the latter case, the material of the foamed resin layer 11 can be appropriately selected in accordance with the conditions of use, the purpose of use, the manufacturing conditions, and the like of the castable concrete formwork 1. Further, the foamed resin layer 1
Various functions can be provided according to one material. The foamed resin layer 11 may be in the form of open cells or closed cells, but closed cells are preferred in order to obtain higher heat insulating performance.

Further, with respect to the heat insulating performance of the form member 2, that is, the cast-in type concrete form 1, those having different forms of the weir plate portion 4 were compared. The results are shown in Table 5 and FIG.
Shown in

The comparison of the heat insulation performance was made by the
Is a resin molded article, a foam molded article, a hollow molded article, and a urethane foam injection molded article. The above-mentioned resin molded body has no air layer inside the weir board part 4, and the foam molded body is a foamed resin layer 11 made of the same material as the weir board part 4 as an air layer inside. The hollow molded body has a cavity as an air layer inside. The urethane foam injection-molded article has a urethane foam layer as an air layer inside, and is made of urethane which is a material different from the above-described form member 2, that is, a material of the weir plate part 4. It is injected into the cavity formed in the part 4 and foamed.

The setting conditions in this case are as follows. Skin layer of each weir board part 4 (skin layer in weir board part 4)
Thickness: 1 mm Foaming ratio of foam molded article: 1.5 times, 2 times, 3 times Thermal conductivity of resin of each dam 4: 0.3 W / m · K Thermal conductivity of urethane foam: 0.028 W / m ・ K

[0093]

[Table 5]

From the results shown in Table 5 and FIG. 14, it was found that the foamed molded article, the hollow molded article and the urethane foam-injected molded article had higher heat insulation performance than the resin molded article. In particular, it was found that the urethane foam injection-molded article had high heat insulating performance. As described above, by selecting a material having high rigidity as the damping plate portion 4, that is, the mold frame member 2, while selecting a material having high heat insulation performance as the foamed resin layer 11 as the air layer, It is possible to obtain a driven concrete formwork 1 having excellent rigidity and heat insulation.

[0095] The cast-in-concrete formwork of the present invention has a configuration in which, in addition to the formwork member, a fireproof and heat-insulating material provided on at least one of the front surface and the back surface of the damping plate portion of the formwork member. Is also good.

According to the above construction, since the fire prevention and heat insulating material is provided on at least one of the front surface and the rear surface of the weir, the form member, that is, the cast-in concrete form, can provide good fire prevention and heat insulation. Functions can be provided.

[0097]

As described above, the drive-in type concrete formwork of the present invention is provided on the back surface of the weir plate portion for damping the poured concrete on the back side,
A mold member having a convex retainer engaging portion for engaging a retainer for maintaining a space between the back surface of the weir plate portion and another mold; and a flexural modulus of the mold member (kgf / c
When m ² ) is E and the thickness (cm) of the form member is h, the form member is configured to satisfy the formula of E / h ≧ 1.5 × 10 ³ .

[0098] This eliminates the need for another member such as a joiner constituting the retainer engaging portion. Therefore, it is possible to reduce the number of parts, for example, to reduce the man-hours required for installing a drive-in concrete formwork to form a wall, and to suppress an increase in cost.

In addition, there is an effect that the deflection of the baffle portion at the time of placing concrete is reduced, for example, when the wall is formed, the thickness of the wall is made as thin as possible, so that a large living space can be secured. .

[0100] In the above-mentioned cast-in-concrete formwork, the formwork member is further provided on a back side of the weir plate portion, and has a reinforcing rib having a predetermined height in a direction protruding from the back surface of the weir plate portion. It is a configuration provided with.

As a result, the thickness of the weir plate portion can be further reduced. Further, even when a material having high strength and having a larger weight than, for example, a resin foam, is used, it is possible to suppress the increase in the weight of the form member.

The above-mentioned cast-in-place concrete formwork has a structure in which each part of the formwork member is formed of the same material.

Thus, the frame member can be integrally and easily formed by, for example, a resin molding technique.
In this case, the connection strength between the weir plate portion and the retainer engaging portion can be increased. As a result, it is possible to reduce the number of formed retainer engaging portions, and to reduce the number of steps for engaging the retainer with the retainer engaging portion during the installation of the driven concrete formwork.

[0104] The above-mentioned cast-in-place concrete form has a configuration in which the reinforcing ribs are formed in a frame shape along the outer shape of the weir plate.

Thus, the reinforcing plate can be used to reinforce the weir plate portion. As a result, it is possible to obtain an impact-type concrete formwork having light weight and high strength.

In the above-mentioned concrete concrete form, the heat transmission coefficient of the weir plate portion is 0.5 W / m ² · K or more and 10 W or more.
/ M ² · K or less.

As a result, the form member, that is, the cast-in-form concrete form has an effect that it can have a good heat insulating function.

[0108] The above-mentioned cast-in-place concrete formwork has a structure in which the weir plate portion has an air layer inside.

As a result, the form member, that is, the cast-in concrete form has an effect that it can have a good heat insulating function.

[0110] The above-mentioned cast-in-place concrete formwork has a structure in which, in addition to the formwork member, a heat insulating material provided on at least one of the front surface and the back surface of the weir plate portion of the formwork member.

Thus, the form member, that is, the cast-in type concrete form, has an effect that it can have a good heat insulating function.

[0112] The above-mentioned cast-in-place concrete formwork has a configuration in which, in addition to the formwork member, a fireproof material is provided on at least one of the front surface and the back surface of the weir plate portion of the formwork member.

As a result, the form member, that is, the cast-in-place concrete form has an effect that it can have a good fire prevention function.

[0114] The above-mentioned cast-in-place concrete form has a configuration in which the thickness of the form member is in the range of 10 mm or more and 45 mm or less.

As a result, for example, when a wall is formed, the wall can be made as thin as possible, so that a large living space can be secured.

[0116] The above-mentioned cast-in-place concrete formwork has a structure in which a fitting portion is formed on the outer surface of the form member so that the outer surfaces of the form members arranged adjacently can be fitted to each other. It is.

As a result, it is possible to prevent misalignment at the time of embedding the cast-in concrete formwork and to prevent outflow of the slack.

[0118] The above-mentioned cast-in-place concrete form has a structure in which the same material is polypropylene.

As a result, there is an effect that a high-strength form member, that is, a cast-in-place concrete form can be obtained.

[Brief description of the drawings]

FIG. 1 (a) is a perspective view showing a back structure of a castable concrete formwork according to an embodiment of the present invention, and FIG. 1 (b) is a perspective view showing the same surface structure.

FIG. 2 is a cross-sectional view taken along line AA in FIG.

FIG. 3 (a) is a perspective view showing a use state of the driven concrete formwork shown in FIG. 1, and FIG. 3 (b) is a longitudinal sectional view of the same.

FIG. 4 is an enlarged view of the vicinity of a retainer engaging portion shown in FIG.

FIG. 5 is a cross-sectional view showing another example of the driven concrete formwork shown in FIG.

6 (a) is a cross-sectional view showing still another example of the driven concrete formwork shown in FIG. 2, and FIG. 6 (b)
It is sectional drawing which shows another example of the driving type concrete formwork shown in FIG.

FIG. 7 is an explanatory diagram of a second moment of area of a beam.

FIG. 8 is an explanatory diagram of a second moment of area of a beam having a rectangular cross section.

9 (a) is a rear view of the drive-in type concrete formwork showing an example in which the frame plate-shaped ribs of the drive-in type concrete formwork shown in FIG. 1 (a) are provided with an uneven structure; FIG. (B)
9 is a sectional view taken along line BB in FIG.
(C) is a sectional view taken along line CC in FIG. 9 (a).

10 (a) is an enlarged view of a portion E in FIG. 9 (b), FIG. 10 (b) is an enlarged view of a portion F in FIG. 9 (b), and FIG. 10 (c) is a view in FIG. 9 (b). G part enlarged view, FIG.
FIG. 10D is a sectional view taken along line DD in FIG. 10C.

11A is an enlarged view showing a projection of the frame plate-like rib shown in FIG. 9A, and FIG. 11B is a view showing FIG. 9B.
FIG. 4 is an enlarged view showing a concave portion of the frame plate-shaped rib shown in FIG.

FIG. 12 (a) is a perspective view showing a use state of a conventional cast-in-place concrete formwork, and FIG. 12 (b) is a view showing FIG.
FIG. 12C is a perspective view of the joiner shown in FIG.
FIG. 13 is a front view of the retainer shown in FIG.

13 (a) is a cross-sectional view showing a configuration in which a foamed resin layer is formed in a cavity in the cast-in-place concrete formwork shown in FIG. 2, and FIG. 13 (b) is shown in FIG. FIG. 13 (c) is a cross-sectional view showing a configuration in which a foamed resin layer is formed on an air layer in the cast-in-place concrete formwork.
It is sectional drawing which shows the structure in which the foamed resin layer was formed in the air layer in the driving-type concrete formwork shown to (b).

FIG. 14 is a view showing the thickness and the thickness of each of the weird board sections in which the form of the weir board section is a resin molded article, a foam molded article, a hollow molded article, and a urethane foam injection molded article in the cast-in-concrete formwork according to the embodiment of the present invention. It is a graph which shows the relationship with a heat transmission coefficient.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving concrete formwork 2 Formwork member 3 Calcium silicate board (fireproof material) 4 Weir board part 4a Cavity part 4b Rib structure part 5 Frame plate-shaped rib (reinforcing rib) 5a Convex part (fitting part) 5b Concave part ( Fitting part) 6 Retainer engaging part 6a Retainer fitting hole 9 Heat insulating material 10 Fireproof / heat insulating material 11 Foamed resin layer

Claims (11)

[Claims] The present invention relates to a dam plate portion for blocking the poured concrete on the rear side, and a retainer provided on the back surface of the dam plate portion for maintaining a gap between the rear surface of the dam plate portion and another formwork. A mold member having a convex-shaped retainer engaging portion for fitting, wherein the flexural modulus (kgf / cm ² ) of the mold member is E, and the thickness (cm) of the mold member is h. The cast-in-form concrete form, wherein the form member satisfies a formula of E / h ≧ 1.5 × 10 ³ . 2. The method according to claim 1, wherein the form member further includes a reinforcing rib provided on a back side of the weir plate portion and having a predetermined height in a direction protruding from the back surface of the weir plate portion. The cast-in concrete formwork according to claim 1. 3. The cast-in concrete formwork according to claim 1, wherein each part of the formwork member is formed of the same material. 4. The reinforcing rib is formed in a frame shape along the outer shape of the weir plate portion.
3. A concrete concrete formwork according to claim 1. 5. A heat transmission coefficient of said weir plate portion is 0.5 W / m ^2.
The cast-in type concrete formwork according to claim 1, characterized in that it is in a range of not less than K and not more than 10 W / m ² · K. 6. The cast-in-place concrete formwork according to claim 1, wherein said weir plate portion has an air layer inside. 7. The driving method according to claim 1, further comprising a heat insulating material provided on at least one of a front surface and a back surface of the damping plate portion of the form member in addition to the form member. Mold concrete formwork. 8. The driving method according to claim 1, further comprising a fireproof material provided on at least one of a front surface and a back surface of the dam member in addition to the mold member. Mold concrete formwork. 9. The mold member having a thickness of 10 mm or more and 45 mm or more.
The cast-in concrete formwork according to claim 1 or 2, wherein the diameter is within a range of not more than mm. 10. A fitting portion is formed on an outer surface of the form member so that the outer surfaces of adjacent form members can be fitted to each other. 2. The cast-in concrete formwork according to 1. 11. The cast-in-place concrete formwork of claim 3, wherein said same material is polypropylene.