JPH108718A - Coupling clip for concrete form made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a difference in level at the coupling part of wall surfaces and to provide an excellent concrete wall surface by a method wherein coupling clips to couple together concrete forms made of resin are formed in a shape wherein a U-shape part and an L-shape part are connected together, and the shape and the size of each part are set to respective given values. SOLUTION: Press processing is applied on a round steel having elasticity to a coupling clip. An angle at which a plane containing U-shaped parts crosses a plane containing not U-shaped parts is set to 90-135 deg., preferably 100-130 deg.. A vertical line suspending from a low part of a U-shaped part from the plane is set to 50mm or more and a vertical line suspending from a position is set to 40mm or more. Further, an angle β between a straight line η and a straight line θ is set to 2 deg. or more, and an angle αbetween a straight line δ and line ζis set to ±5 deg. or less. A straight line is inserted in coupling clip holes 4 formed in side parts of two concrete forms and the bottom part of the U-shaped part is forced to fall in a direction Y for coupling. This constitution provides a coupling clip which is light and excellent in durability and workability, and excellent in assembly precision of concrete forms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting clip used when two or more resin-made concrete forms having side portions are connected to each other at a side portion thereof. Minimize the gap,
The purpose of the present invention is to prevent concrete slurry from leaking from the gap, minimize sticking to the side surface portion, and reduce the work of concrete formwork.

[0002]

2. Description of the Related Art As a concrete form, a wooden concrete form has been most commonly used. However, materials for wooden concrete formwork have recently become difficult to obtain due to the rainforest conservation movement, and the use of them has been restricted by the government or local government. At present, wooden concrete forms are disposable after several uses. Furthermore, in addition to such resource problems, the use of wood as a material for a concrete form requires the work of a skilled worker to pier, etc. Due to the labor shortage problem, it is desired to integrally form the concrete form. ing.

[0003] For this reason, in recent years, plastic concrete formwork has begun to spread gradually. Plastics are roughly classified into thermoplastic resins and thermosetting resins. Examples of the thermoplastic resins include polyethylene and polypropylene, and are characterized in that a resin molded product can be obtained most efficiently by injection molding. However, rigidity is low as it is for a structural body such as a concrete formwork, and reinforced by glass chops or glass fibers. In addition, large resin products such as concrete formwork are likely to be deformed as a common problem, and in the case of polypropylene or the like, an integrally molded product such as a concrete formwork is used after correcting the side part by cutting or the like. I have. In addition, in the molding of thermoplastic resin by the injection molding method, it is necessary to use a large-sized injection molding machine, which is one of the few in Japan, to produce a large-sized concrete formwork. There are problems such as the need for various expensive molds.

On the other hand, a typical thermosetting resin is a urethane resin, but is rarely used as a structural body. The use of FRP in the hand lay-up method is also conceivable, but has problems such as productivity and uniformity of quality.

On the other hand, recently, as a thermosetting resin, a monomer liquid comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system (also referred to as a metathesis catalyst system) and a metathesis resin containing an activator component A method has been proposed in which a monomer liquid comprising a polymerizable cyclic olefin is mixed, injected into a mold, polymerized and crosslinked in the mold to produce a crosslinked polymer molded product (for example, Japanese Patent Publication No.
No. 28451).

[0006] This reaction injection molding method can use easily available raw material monomers, has a low viscosity of the monomers and low injection molding pressure, has a fast polymerization / crosslinking reaction, has a short molding cycle, and has a large molded product. Has been attracting attention because of its excellent advantages, such as the fact that the compound can be obtained relatively easily and the balance between rigidity and impact resistance.

[0007] In recent years, in residential buildings such as condominiums, the concrete wall surface has been shifted from a conventional method of finishing the surface with a plaster board to a method of directly attaching wallpaper to a concrete surface.
In the early stage of use, the surface is kept smooth, but if it is used several times, the concrete contact surface of the wooden plywood (hereinafter the surface that directly contacts the concrete on which the concrete form is to be solidified and formed) is used as the concrete contact surface. However, the concrete contact surface of the wooden plywood peels off, and the cast concrete surface becomes rough due to the occurrence of abnormal surfaces such as protrusions, and it takes time to obtain a good concrete surface Repairs have been forced.

On the other hand, in the case of a plastic concrete form by injection molding or the like, unlike the wooden concrete form, the concrete surface is not roughened due to surface peeling, but is harder than the wooden concrete form.
In the integrally molded plastic concrete formwork,
Since the flatness of the side part is inferior to that of the wooden concrete formwork by mechanical cutting, a gap is easily formed in the connection part between the concrete formwork, and solid matter called slag ( In the specification of the present application, the slag sticks, and the work of removing the slag to reuse the concrete formwork is troublesome.

[0009] In the method of directly sticking the wallpaper to the concrete surface, if there is a step on the concrete contact surface of each concrete form, the surface of the wallpaper becomes uneven, and the aesthetic appearance is significantly impaired. After forming the concrete wall and before applying the wallpaper, repair work is required to smooth the surface of the concrete. For this reason,
There is also a growing need for the development of a technology for preventing a step (concrete contact surfaces not being on the same plane) from occurring on the concrete contact surface.

In terms of durability as a material and accuracy of side portions, a metal concrete form is most excellent. However, in addition to being expensive, it is very heavy and requires a crane or the like for assembling, and has drawbacks such as very poor workability. Therefore, improvement is desired.

As described above, timber which has been widely used as a concrete formwork since ancient times needs to be dealt with due to changes in the market environment, and plastics which have been gradually used have their own problems. In order to respond to changes in the construction method, it is difficult to use metal concrete formwork in general, and concrete formwork that satisfies various conditions has not yet been provided. .

[0012]

DISCLOSURE OF THE INVENTION The present inventors have protected the forest resources used in large quantities as concrete formwork materials, and have encountered problems in developing concrete formwork that is easy to assemble even for non-skilled workers. An object of the present invention is to provide an excellent connection clip for preventing the occurrence of a gap between connection portions and a step on a concrete contact surface.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems relating to the concrete formwork. As a result, the cyclic olefin was crosslinked and polymerized in a mold using a metathesis catalyst system. The obtained synthetic resin concrete formwork that was integrally molded was proposed (see, for example, JP-A-7-108520). This concrete formwork has various properties required for concrete formwork, that is, stiffness that can withstand the weight of concrete to be cast, light weight that can be easily transported by workers, nailing and saw cutting required for on-site assembly It is easy to use and durable for repeated use. However, the gap between the connecting portions of the concrete formwork is inferior to that of the wooden concrete formwork, and it is necessary to solve a new problem such as a step at the concrete contact surface.

Therefore, as a result of diligent studies on the solution of this problem, the two causes largely depend on the shape of the connecting clip for connecting the concrete forms, and in order to secure the confidentiality of the concrete form. The present inventors have found that there is a shape of a connection clip having an excellent gripping force with respect to the connection between the concrete forms of the present invention, and have reached the present invention.

That is, the present invention provides: A connecting clip used for connecting two or more resin-made concrete forms, wherein: 1) the shape of the clip is such that one U-shaped part and one L-shaped part are connected at one end thereof; 2) Of the two parts forming the inner arm part of the U-shaped part, the part where the U-shaped part and the L-shaped part are connected to each other, and Let the portion be B, and for the two substantially linear portions of the L-shaped portion, the portion where the U-shaped portion and the L-shaped portion are connected is C, and another 3) The cross sections of a, b, c, and d are each substantially circular, and 4) the straight line formed by connecting the centers of the circular cross sections of i and b is the same. 5) Including a straight line connecting the centers of the circular cross-sections of b A plane X, which is a plane and is orthogonal to the plane Iro, is also orthogonal to a plane Hani including two straight lines formed by connecting the centers of the circular cross sections of C and D. 6) Each circle of A and C On a plane Iha including two straight lines formed by connecting the centers of the cross-sections, an angle γ formed by two straight lines formed by connecting the centers of the respective circular cross-sections of A and C is 90 ° to 135 °. 7) And the distance between two straight lines η and θ formed by connecting the centers of the circular cross sections of A and B becomes narrower in the direction of the opening of the U-shaped portion. 1. A connecting clip for a concrete formwork made of resin, The above 1. Wherein the straight line formed by the intersection of the flat surface and the flat surface is f, and the length of the two portions on a straight line δ connecting the centers of the circular cross sections of the inner portion of the L-shaped portion. The distance between the position E and the straight line when the perpendicular is lowered from the position E corresponding to the midpoint in the above to the straight line is 40 mm or more, and the straight line δ formed by connecting the centers of the circular cross sections of the two. 2. A connecting clip for resin concrete, wherein an angle α formed by the flat surface with the flat surface is within ± 5 °. The angle β formed by two straight lines η and θ formed by connecting the centers of the respective circular cross sections of a and b in the U-shaped portion is 2 ° or more, and a bottom portion of the U-shaped portion When a perpendicular line is dropped down to a straight line from the bottom part の of the U-shaped curve ε formed by connecting the centers of the circular cross sections, the distance between the bottom part と and the straight part is 50 mm or more. The above-mentioned 1. Or 2. 3. A connection clip for a resin concrete formwork according to the above, and A resin concrete form is formed from a monomer solution A (solution A) comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst and a metathesis polymerized cyclic olefin containing an activator component of a metathesis polymerization catalyst. A crosslinked polymer having an integrally molded side surface obtained by mixing a monomer solution (solution B), and injecting the raw material mixture into a mold, and performing polymerization and crosslinking reaction in the mold. 1. A concrete form comprising: 2. Or 3. 3. The connection clip for a concrete concrete formwork according to item 1.

Hereinafter, the present invention will be described more specifically. Examples of the synthetic resin constituting the concrete formwork of the present invention include thermoplastic resins such as polyethylene and polypropylene. Further, a crosslinked polymer of a metathesis polymerizable cyclic olefin is preferably used. As the metathesis polymerizable cyclic olefin, those containing one to two metathesis polymerizable cycloalkene groups in the molecule are used. Preferred are compounds having at least one norbornene skeleton in the molecule. Specific examples of these include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene codimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenylnorbornene, 1,4,5,
8-Dimethano-1,4,4a, 5,6,7,8,8a,
-Octahydronaphthalene, 1,4-methano-1,4,
4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4,5,8-dimetano-1,
4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4-methano-1,4,4
a, 5,6,7,8,8a-octahydronaphthalene,
1,4,5,8-dimethano-1,4,4a, 5,8,8
Examples thereof include a-hexahydronaphthalene and ethylenebis (5-norbornene), and a mixture thereof can also be used. In particular, dicyclopentadiene or a mixture containing 50 mol% or more, preferably 70 mol% or more thereof is suitably used.

If necessary, a metathesis polymerizable cyclic olefin having a polar group containing a different element such as oxygen or nitrogen can be used as a copolymer monomer. The copolymer monomer to be hung is also preferably one having a norbornene structural unit, and the polar group is an ester group,
Preferred are an ether group, a cyano group, an N-substituted imide group, a halogen group and the like. Specific examples of such a copolymerized monomer include 5-methoxycarbonylnorbornene, 5- (2-
Ethylhexyloxy) carbonyl-5-methylnorbornene, 5-phenyloxymethylnorbornene, 5-cyanonorbornene, 6-cyano-1,4,5,8-dimetano-1,4,4a, 5,6,7,8 , 8a-octahydronaphthalene, N-butylnadic imide, 5-chloronorbornene, and the like.

The monomer liquid A (solution A) in the present invention contains a catalyst component of a metathesis polymerization catalyst system. As such a catalyst component, salts of metals such as tungsten, rhenium, tantalum and molybdenum, and salts of ammonium and the like are used, and a tungsten compound is particularly preferable. As such a tungsten compound, tungsten hexahalide, tungsten oxyhalide and the like are preferable, and more specifically, tungsten hexachloride, tungsten oxychloride and the like are preferable. Further, an organic ammonium tungstate or the like can be used. It has been found that such a tungsten compound immediately starts cationic polymerization when added directly to a monomer, which is not preferable. Therefore, it is preferable to use the tungsten compound after suspending it in an inert solvent such as benzene, toluene, chlorobenzene or the like in advance and solubilizing by adding a small amount of an alcohol compound and / or a phenol compound. Further, as described above, it is preferable to add about 1 to 5 mol of a Lewis base or a chelating agent to 1 mol of the tungsten compound in order to prevent undesired polymerization. Examples of such additives include acetylacetone, alkyl acetoacetates, tetrahydrofuran, and benzonitrile. When a polar monomer is used, as described above, the polar monomer itself may be a Lewis base, or the compound may have its action without adding any of the above compounds. As described above, the monomer liquid A containing the catalyst component (solution A) has substantially sufficient stability.

On the other hand, the monomer liquid B (solution B) of the present invention contains an activator component of a metathesis polymerization catalyst system. This activator component is represented by the following I-
Organometallic compounds centered on alkylated group III metals, especially tetraalkyltin, alkylaluminum compounds, alkylaluminum halide compounds are preferred,
Specific examples include diethyl aluminum chloride, ethyl aluminum dichloride, trioctyl aluminum, dioctyl aluminum iodide, tetrabutyl tin and the like. By dissolving the organometallic compound as an activator component in a monomer, a monomer solution B
(Solution B) is formed.

Basically, by mixing the solution A and the solution B and injecting the mixture into a mold, a molded product of a desired crosslinked polymer can be obtained. Is initiated so quickly that curing can occur while not sufficiently flowing into the mold, which is often problematic. Therefore, it is preferable to use an activity modifier. As such a regulator, Lewis bases are generally used, and above all, ethers, esters, nitriles and the like are used. Specific examples include ethyl benzoate, butyl ether, diglyme and the like. Such a regulator is generally used by being added to the solution (solution B) of the component of the activator of the organometallic compound. When a monomer having a Lewis base is used as described above, it can also serve as a regulator.

The amount of the metathesis polymerization catalyst system used is, for example, when a tungsten compound is used as a catalyst component, the ratio of the tungsten compound to the raw material monomer is as follows:
About 1,000 to 15,000 to 1, preferably 1,500 to 2,500 to 1 is used on a molar basis, and when the activator component is an alkyl aluminum, The ratio of the aluminum compound to the raw material monomer is about 100: 1 to 10,000: 1, preferably 200: 1 to 1,000: 1, on a molar basis. Further, as described above, the chelating agent regulator may be appropriately subjected to experiments depending on the amount of the catalyst system used,
It can be adjusted and used.

The molded product of the crosslinked polymer obtained according to the present invention may further contain various additives depending on the purpose in order to improve or maintain its properties in practical use. Such additives include fillers, pigments,
There are antioxidants, light stabilizers, flame retardants, polymer improvers and the like. Such an additive cannot be added after the crosslinked polymer of the present invention has been formed, and therefore must be added to the above-described raw material solution in advance when added.

The easiest method is to add it to one or both of the solution A and the solution B in advance. In this case, a highly reactive catalyst component in the solution, It must not react with the agent component in a practically acceptable degree and must not inhibit polymerization. Even if the reaction inevitably coexists, if the reaction does not substantially inhibit the polymerization or if the inhibition requires a certain amount of time, mix with the monomer to prepare a third liquid, and immediately before polymerization, They can be mixed and used. Further, in the case of a solid filler, both components are mixed and immediately before the start of the polymerization reaction or a material having a shape capable of sufficiently filling the voids during the polymerization, is filled in the molding die in advance. It is also possible to put it.
Reinforcing agents or fillers as additives are effective in improving flexural modulus. Such materials include glass fiber, mica, carbon black, wollastonite and the like. Those surface-treated with a so-called silane coupler or the like can be suitably used.

It is preferable that an antioxidant is added to the molded article according to the present invention. Therefore, it is desirable that a phenol or amino antioxidant is added to the solution in advance. Specific examples of these antioxidants include 2,6-di-t-butyl-p-cresol, N, N
'-Diphenyl-p-phenylenediamine, tetrakis [methylene (3,5-di-t-butyl-4-hydroxycinnamate)] methane and the like.

The molded product of the present invention can be obtained by adding another polymer in the state of a monomer solution before molding. As such a polymer additive, the addition of an elastomer is effective in increasing the impact resistance of the molded product and adjusting the viscosity of the solution. Elastomers used for such purposes include styrene-butadiene-styrene triblock rubber, styrene-isoprene-styrene triblock rubber, polybutadiene, polyisoprene,
A wide range of elastomers such as butyl rubber, ethylene-propylene-diene-terpolymer, nitrile rubber can be mentioned.

As the material of the mold used for molding the concrete formwork of the present invention, casting or thermal spraying of steel, cast or forged aluminum or zinc alloy, etc.
Examples include electroforming of nickel or copper or resin.
In addition, since the pressure generated in the mold at the time of molding is several kg / cm ² , which is extremely low as compared with other molding methods, a simple structure is sufficient. It can be made cheaper than a mold.

Since the concrete formwork of the present invention is generally used for casting concrete as it is, reinforcing ribs and bosses are provided on the surface on the back side with respect to the concrete contact surface, and the concrete formwork is attached to the periphery. A frame for joining (also referred to as a side portion in the present specification) is provided. The frame (side portion) is provided with a hole for a connecting clip for connecting the concrete forms.

In general, more than a dozen concrete forms are connected at their respective side portions, and the surfaces which are the concrete contact surfaces are opposed to each other.
Assemble as a set frame. The facing concrete forms are fixed with a jig called a separator to keep the space. A reinforcing skeleton called a flap angle is attached to the back surface of the concrete formwork. Concrete is poured between two sets of concrete forms facing each other,
After the concrete has solidified, the concrete formwork is removed and a concrete wall is created.

In order to connect the concrete forms at the side portions, a connecting clip is usually used.
If the concrete forms are not tightly adhered to each other when assembling the concrete forms, a large amount of the poured concrete leaks out from the gap between the joints,
The slag adheres to the side of the concrete formwork, necessitating repairs to remove it.

In order to prevent such a connection failure between the concrete forms, it is necessary to consider a mold for improving the lateral accuracy of the molded product. It has been found that the performance of the connecting clip, especially its shape, is important.

Next, the structure of the connecting clip to which the present invention is directed and the structure of a molded concrete formwork integrally formed will be described.

FIG. 1 shows an example of the connecting clip of the present invention, and FIG. 2 shows the spatial relationship of each part of the connecting clip according to the present invention. FIG. 1A is a top view of the connecting clip, showing a U-shaped portion and an L-shaped portion. B is A
C shows a side view as viewed from a direction perpendicular to B. FIG. D is a perspective view showing one aspect at the time of attaching the connecting clip.

Here, a means a portion connected to the L-shaped portion of the U-shaped portion which forms the arm portion of the U-shaped portion, B means another portion, and C means the L-shaped portion. Of the two substantially linear portions of the shaped portion, the portion connected to the U-shaped portion of the two portions is the other portion. The cross sections of I, B, C and D are substantially circular. The plane iro shown in FIG. 2 is a plane including a straight line formed by connecting the centers of the respective circular cross sections of A and B, and a plane X
Is a plane that includes a straight line formed by connecting the centers of the circular cross sections of A and is a plane that is orthogonal to the plane Iro, and the plane hani is formed by connecting the centers of the respective circular cross sections of C and D. The plane X is orthogonal to both the plane iro and the plane hani. The symbol F indicates a straight line formed by intersecting the plane iro and the plane hani.

The angle α shown in FIG. 1 C, the straight line δ formed by connecting the centers of the inner two circular cross-section (represented by chain lines ζ Figure 1 C in one point) plane Gray L-shaped part and Angle. If the intersection of the chain line ζ a point in the line δ and Figure 1 C is on the right side of FIG. 1 C towards the Figure 1 C is, alpha is +
(+) Sign, and conversely, when it is on the left side,-
(Minus) sign.

The angle β shown in FIG. 1A is an angle formed by two straight lines η and θ formed by connecting the centers of the respective circular cross sections of A and B, and the angle γ shown in FIG. Is
On a plane i including two straight lines formed by connecting the centers of the respective circular cross sections of b and c, at an angle formed by two straight lines formed by connecting the centers of the respective circular cross sections of a and c is there.

The symbols "nu" and "u" are side portions of two concrete forms (corresponding to a frame 3 described later with reference to FIG. 3).

In FIG. 2, a line segment G is drawn from a position E corresponding to the midpoint of the length of the length D on a straight line δ connecting the centers of the circular cross sections of the length D to a straight line formed by the intersection between the plane iro and the plane Hani. Is the distance between the position E and the straight line when the perpendicular is lowered, and the line segment R is a U-shaped curve ε formed by connecting the centers of the circular cross-sections at the bottom of the U-shaped portion. This is the distance between the bottom part C and the straight line when a perpendicular is dropped from the bottom part C to the straight line. Note that the length of the d on the straight line δ connecting the centers of the circular cross sections of d is the point at which the straight line δ intersects the straight line formed by connecting the centers of the circular cross sections of the partial c, and the straight line δ is the free Indicates the length connecting the end (the end that is not connected to the part C) and the point where it intersects.

FIG. 3 shows a concrete form which is integrally formed as an example of the concrete form of the present invention. E is a plan view,
F is a side view in the longitudinal direction, G is a side view in the horizontal direction, and H is a cross-sectional view of XX section of E. In FIG. 3, the concrete form is a rectangular (rectangular) plate-shaped body 1 as shown in a plan view E , and the frame 3 (side surface portion) is formed on one side thereof along the periphery as shown in the figure. ), And has one or more (four in FIG. 3) ribs 2 in the longitudinal direction. The surrounding frame 3 and the plurality of ribs 2
Surface opposite to the surface where There has been formed (the opposite side of FIG. 3 E) is a concrete contact surface is a plane in the case of FIG. 3 (generally not flat, but may be curved) .

The structure of the concrete formwork of the present invention is such that a plane part having a size d.times.e of 900.times.1800 mm or 600
X1800 mm or the like can be applied as it is, but it is not limited to this shape. The thickness (g in FIG. 3H ) of the plate-like body 1 forming the concrete contact surface is suitably in the range of 3 to 12 mm.

The frame 3 provided on the periphery has a thickness (FIG. 3).
F) of E is preferably in the range of 5 to 10 mm.
The height (h in FIG. 3G ) of the (side portion) is preferably in the range of 50 to 80 mm, and is generally 60 to 62 mm of Kanto size and 7 of Kansai size used for wooden concrete formwork.
0 mm or the like is used as it is.

The hole for the frame 3 through a connecting clip, bolt or the like for connecting the concrete form each other (Fig. 3 F
4) is provided. Further, the frame 3 may be provided with a small hole 5 for nailing for hitting a wooden frame or the like.

The joining clip of the present invention is a joining clip to be used for connecting two or more sheets of resin concrete form as described above, it will be described by Figure 1 D, L-shaped part two the partial, side portions Nu which aligned with as shown in FIG. 1 D, was inserted into the hole 4 for the passage of the connecting clips in LE, the bottom portion of the U-shaped portion in the direction of arrow Y in FIG. 1 D by pushing down, connecting the two concrete formwork in its side portions, when removing the joining clip, the bottom portion of the U-shaped portion, a hammer from a direction opposite to the Y direction in FIG. 1 D It is used by hitting to loosen the connection. 1)
~ 7), 2. Or 3. This is a clip having the shape shown in FIG.

The above symbols correspond to the above-mentioned 1 .. 1) to 7), 2. 3. Or 4. Corresponding to the symbol in.

[0044] Of the above, the angle γ in the case of less than 90 DEG, the bottom portion of the U-shaped portion at the time of removal of the connection clip from the direction opposite to the Y direction in FIG. 1 D when striking a hammer The connecting clip may be buckled and difficult to remove. On the other hand, if it is larger than 135 °, a long connecting clip is required to obtain sufficient tightening at the time of connecting.
Therefore, the angle should be within 90 ° to 135 °, and the range of 100 ° to 130 ° is more desirable in terms of easy attachment and detachment.

As the material of the connecting clip, a metal having elasticity is generally used. Preferably, a round steel is pressed and used.

[0046] For the diameter of the holes 4 for connecting clips provided on the side surface portion of the concrete form, so that it can be inserted easily two portions in FIG. 1 A, somewhat than the maximum diameter of the cross section of part of two It is necessary to be large, and from workability, 0.5 to 1.0 mm from the maximum diameter of the cross section of the two parts
Was found to be desirable, but at the same time,
It has been found that when the connecting clip is tightened, a step as described above may occur at the concrete contact surface of the two connected concrete forms.

Therefore, as a result of studying this prevention,
When the inner portion of the L-shaped portion penetrates the hole for the connecting clip, the straight line δ formed by connecting the centers of the circular cross sections of the two portions is caused by the center line of the hole. When they are not along, a force acts to shift the side portions of the two concrete forms to each other, and specifically, the angle α formed by the straight line δ formed by connecting the centers of the circular cross sections of the two with the plane iro is If the angle exceeds the range of ± 5 °, the force of this shift causes the side portions of the concrete forms to shift, that is, the step at the concrete contact surface as described above occurs. It has been found that the step at the concrete contact surface as described above can be prevented by keeping the thickness within ゜.

With respect to the U-shaped portion, the side surfaces of the two concrete forms to be connected are overlapped, sandwiched between the U-shaped portions, and have the function of fastening the concrete forms together.

According to the present invention, in order to efficiently tighten the side portion of the concrete form when the concrete form is tightened, the above-mentioned 1. As in 7), the distance between the two straight lines η and θ formed by connecting the centers of the circular cross sections of A and B becomes narrower in the direction of the opening of the U-shaped portion. It is also characterized by.

Generally, a concrete mold made of a synthetic resin is often deformed on its side due to shrinkage or thermal distortion after molding. Deformation also occurs in a concrete formwork in which a cross-linked polymer made of a metathesis polymerizable cyclic olefin is integrally molded. As shown in FIG. Often have. Here, FIG. 4 shows a case where two concrete forms are arranged such that their side surfaces in the longitudinal direction are in contact with each other.
H shows a part of a cross section corresponding to the cross section of H ,
Since the side portion is bent outward in the shape of a "ku", a gap shown by reference numeral 8 is generated. For this reason, unless the side portion (for example, number 7 in FIG. 4) closer to the concrete contact surface than the inflection point (number 6 in FIG. 4), the side portions of the concrete form cannot be sufficiently adhered to each other. Therefore, for this purpose, the opening of the U-shaped portion of the connecting clip needs to be narrower than the bottom portion of the U-shaped portion. Therefore, the above 3. , The angle β formed by two straight lines η and θ formed by connecting the centers of the circular cross-sections A and B of the U-shaped part.
Has been found to be more preferably at least 2 °.

There are two types of concrete forms, Kanto type and Kansai type. The height (h in FIG. 3G ) of the side of the concrete form is 60 to 62 m in the former.
m and 70 mm in the latter case, but the inflection point (number 6 in FIG. 4) which is inflected in the shape of a “ku” as described above regardless of which of them is used. In order to be able to tighten the side portion (for example, number 7 in FIG. 4) close to the surface that comes into contact with the concrete, it was also found that the distance in FIG. 2 was 40 mm or more and the distance was 50 mm or more. Was done.

The connecting clip of the present invention can be used not only for concrete forms made of a crosslinked polymer of cyclic olefins, but also for concrete forms made of other resins, for example, concrete forms made of polyethylene, polypropylene or unsaturated polyester resin. It is valid.

[0053]

The present invention will be described below with reference to examples. The examples are illustrative and the invention is not limited thereto. In the following Examples and Tables, the angle alpha, as previously described, if the intersection of the chain line ζ a point in the line δ and Figure 1 C is on the right side of FIG. 1 C towards the Figure 1 C + ( It has a plus sign, and conversely, if it is on the left, it has a minus sign. Also,
For the angle β, the interval between the two straight lines η and θ is U
When it becomes narrower in the direction of the opening of the character-shaped portion, it has a + (plus) sign, and when it becomes wider, it has a-(minus) sign.

Reference Example 1 (Preparation of Solution A) 28 parts by weight of tungsten hexachloride was added to 80 parts by weight of dry toluene under a nitrogen stream, and then t
A solution of 1.3 parts by weight of butanol dissolved in 1 part by weight of toluene was added and stirred for 1 hour.
A solution consisting of 8 parts by weight and 14 parts by weight of toluene was added and stirred for 5 hours under a nitrogen stream. Further, 14 parts by weight of acetylacetone was added. Stirring was continued overnight under a nitrogen stream while expelling by-produced hydrogen chloride gas to prepare a polymerization catalyst solution.

Next, purified dicyclopentadiene (purity 9
9.7% by weight, the same shall apply hereinafter) 95 parts by weight and purified ethylidene norbornene (purity 99.5% by weight, the same applies hereinafter) 5 parts by weight of a monomer mixture comprising ethylene-propylene-ethylidene norbornene having an ethylene content of 70 mol%. 3 parts by weight of polymerized rubber, Ethanox 7 as oxidation stabilizer
02 was added to the solution to which 2 parts by weight of No. 02 was added so that the tungsten content was 0.01 M / L to prepare a monomer solution A (solution A) containing a catalyst component.

Reference Example 2 (Preparation of Solution B) Ethylene-propylene-ethylidene norbornene copolymer rubber containing 70 mol% of ethylene based on a monomer mixture consisting of 95 parts by weight of purified dicyclopentadiene and 5 parts by weight of purified ethylidene norbornene Trioctyl aluminum 8 was added to the solution in which 3 parts by weight were dissolved.
5, a polymerization activator mixture prepared by mixing and preparing dioctyl aluminum iodide 15 and diglyme 100 in a molar ratio is added at a ratio where the aluminum content becomes 0.03 M / L, and a monomer solution B containing an activator component is added. (Solution B) was prepared.

Example 1 (Molding) A forged aluminum mold having a cavity for obtaining a crosslinked polymer concrete form having the shape shown in FIG. 3 was used for molding. The dimensions of the mold were as follows (symbols are as shown in FIG. 3). Regarding the shape of the plate-like body Length in the horizontal direction (d) = 600 mm Length in the longitudinal direction (e) = 2062 mm Thickness (g) of the plate-like body 1 = 4 mm Regarding the frame 3 around the plate-like body Thickness (f) = 8 mm Height of frame 3 (h) = 62 mm Regarding longitudinal ribs (four) Rib thickness (i) = 8 mm Rib height (h) = 62 mm

The aluminum mold for molding was heated to a cavity mold of 90 ° C. and a core mold of 70 ° C., and the mold was closed. After that, the solution A of Reference Example 1 was mixed in a mixing head using a RIM molding machine. And solution B of Reference Example 2 were collision-mixed and injected. Five minutes after the liquid injection and filling, the mold was opened, and a cross-linked polymer concrete form was taken out.

The side portion (frame 3) of the taken out crosslinked polymer concrete form is about 3 mm from the concrete contact surface side.
As shown in FIG. 4, it is bent outward in the form of opening outward to the vicinity of 5 mm, and from the vicinity of 35 mm (inflection point 6 in FIG. 4) to the outside (inflection point in FIG. 4). Curve 6
(The side opposite to the concrete contact surface with respect to) drawn a light arc and extended almost perpendicular to the concrete contact surface.

When the two concrete forms are brought into close contact with each other with the concrete contact surface facing downward, the gap between the side surfaces at the position of the concrete contact surface (corresponding to numeral 8 in FIG. 4). In ()), a gap of 1 mm was formed at the concrete contact surface portion.

[0061] the side surface portion of the crosslinked polymer made concrete form, a hole diameter 14mm for passing a clip as shown in the hole 4 of FIG. 3 F, from the concrete contacting surface 35
The center of the hole is located at a position of 5 mm, and five holes are provided at equal intervals in the longitudinal direction of the concrete formwork. As a result, the gap between the side portions at the position of the concrete contact surface (corresponding to No. 8 in FIG. 4) was 0.1 mm.
It was 1 mm or less. The dimensions of the connecting clips used were as follows (symbols are shown in FIGS. 1 and 2). Dimensions of connecting clip Part A, Part B, Part C, Part D = 13 mm φ Part A length = 34 mm Part B length = 34 mm Part C length = 50 mm Part D length = 20 mm Distance G = 50 mm Distance = 80mm Angle α = + 1 ° Angle β = + 3 ° Angle γ = 110 °

(Evaluation as Concrete Formwork) Two sets of the concrete formwork (hereinafter referred to as a formwork set) connected as described above, and the surface of the two formwork sets (the longitudinal direction of the concrete formwork being up and down) Concrete contact surfaces) are arranged so that they are facing each other and parallel to each other with a distance of 150 mm, and when the concrete is poured into the space between the concrete contact surfaces of this formwork, the left and right sides of the formwork do not flow out. With wooden plywood. Thereafter, concrete was poured into the gap from above.

As a result, no deformation such as the movement of the concrete form (the position of the concrete form is displaced) and the spread (the plate-like body 1 in FIG. 3 expands due to the pressure of the concrete) during the driving of the concrete does not occur. Was.
After the concrete has hardened, the formwork can be easily peeled off, and no discoloration or poor curing of the concrete surface is observed.
Extrusion of concrete into the gap between the joints of the concrete formwork is also minimal, and only powdery deposits are recognized,
It could be easily removed by wiping. Also, almost no step was found on the concrete contact surface of the concrete formwork, and it was not necessary to level the surface of the concrete before applying the wallpaper directly to the concrete surface.

[Comparative Example 1] (Connection of Formwork) Using the crosslinked polymer concrete formwork of Example 1 and connecting the concrete formwork using the connecting clips having the following specifications, as in Example 1. I went to. At this time, the gap (corresponding to No. 8 in FIG. 4) between the side surfaces at the position of the concrete contact surface was 1 mm. Dimensions of the connecting clip The thickness of each part A, B, C, and D = 13 mm φ The length of the part A = 27 mm The length of the part B = 27 mm The length of the part C = 36 mm The length of the part D = 20 mm Distance G = 37mm Distance = 48mm Angle α = + 6.5 ° Angle β = + 1.5 ° Angle γ = 145 °

(Evaluation as Concrete Formwork) Using two sets of the linked formwork, a concrete wall was cast in the same manner as in Example 1. Thickness of the protruding concrete adhered to the gap between the joints of the concrete form removed after the concrete had hardened, and it had to be removed little by little with a hammer. In addition, concrete projections were formed on the concrete surface corresponding to the connection portions of the concrete formwork, and it was necessary to perform repair work over time. In addition, the step on the concrete contact surface of the concrete formwork is also 0.5 to 1 mm, and accordingly, a step is also generated on the concrete surface,
In order to apply the wallpaper directly to the concrete surface, it was necessary to cut and smooth the surface in advance.

[Comparative Examples 2 and 3] In the same manner as in Comparative Example 1 except that the values shown in Table 1 were used, the connection of the formwork and the evaluation as a concrete formwork were performed. As a result, as shown in Table 2, there was more slag and a step was generated as compared with the examples.

[0067]

[Table 1]

[0068]

[Table 2]

[0069]

Industrial Applicability The fastening clip for concrete formwork of the present invention is formed integrally, is easy to handle, is lightweight, and has excellent durability for synthetic resin formwork which is excellent in durability against repeated use many times. In addition to being excellent in the accuracy of assembling the concrete formwork, it is possible to obtain a good concrete wall surface. Therefore, to promote the spread of concrete forms made of synthetic resin, to meet the strong demands from the market, such as protecting natural resources, responding to the shortage of skilled workers, and responding to various shapes and sizes required by the market. Becomes possible.

[Brief description of the drawings]

FIG. 1 shows an example of a connection clip for a resin concrete formwork of the present invention. A is a top view, B is a side view, and C is a side view in a direction orthogonal to B. D shows a usage mode of the connecting clip.

FIG. 2 shows a spatial relationship of each part of the connecting clip according to the present invention.

FIG. 3 shows an example of a concrete formwork used in the present invention. E is a plan view, F is a longitudinal side view, G
Indicates a lateral side view, and H indicates a cross-sectional view of the XX section of E.

FIG. 4 is a cross-sectional view showing a side portion of the integrally formed concrete form that is bent in the shape of a square.

[Explanation of symbols]

A part of the U-shaped part that is connected to the L-shaped part of the part that forms the arm part. B The part of the U-shaped part that is different from the part A that forms the arm part. (C) a portion of the two L-shaped portions which are substantially linear and which is connected to the U-shaped portion; (d) a portion of the two substantially linear portions of the L-shaped portion A plane containing two straight lines formed by connecting the centers of the circular cross sections of the parts I and B. A plane containing a straight line formed by connecting the centers of the circular cross sections of A and B A plane that is perpendicular to the plane Iro (also perpendicular to the plane Hani) Hani A plane containing two straight lines formed by connecting the centers of the circular cross sections of H and D A plane containing two straight lines formed by connecting the two. At the position corresponding to the midpoint of the length of d on the straight line δ connecting the centers of the cross-sections, f. A straight line formed by the intersection of the plane iro and the plane h. Distance between the straight line and the bottom of the U-shaped curve ε formed by connecting the center of the circular section at the bottom of the U-shaped part. Distance to straight line nu Side part of concrete formwork Le Side part of concrete formwork α Angle formed by straight line δ formed by connecting the centers of circular cross-sections of two cross-sections with plane plane β Angle formed by straight lines η and θ γ An angle formed by two straight lines formed by connecting the centers of the circular cross sections of A and C on the plane Iha δ A straight line formed by connecting the centers of the two circular cross sections ε Bottom of the U-shaped part U-shaped curve formed by connecting the centers of the circular sections of Line η generated when the iro is viewed along the plane η A straight line formed by connecting the centers of the circular cross-sections of イ θ A straight line formed by connecting the centers of the circular cross-sections of ロ 1 1 Plate-like body 2 Rib 3 Frame 4 Hole for connecting clip 5 Small hole 6 Inflection point 7 Example of side portion closer to concrete contact surface than inflection point 8 Gap between side portions at position of concrete contact surface d Length of plate-like body in the horizontal direction e Length of plate-like body Length in direction f Thickness of frame 3 g Thickness of plate 1 h Height of frame 3 (side portion) i Thickness of ribs in frame 3

Continued on the front page (72) Inventor Nobuo Yoshikiyo 2-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Teijin Meton Co., Ltd.

Claims (4)

[Claims] 1. A connecting clip used for connecting two or more resin-made concrete formwork, wherein: 1) the clip has one U-shaped part and one L-shaped part; 2) With respect to two portions forming an inner arm portion of the U-shaped portion, a portion where the U-shaped portion and the L-shaped portion are connected to each other. A, the other part is B, and for the two substantially linear parts of the L-shaped part, the part where the U-shaped part and the L-shaped part are connected is C) If the other part is d, 3) the cross-sections of a, b, c, and d are each substantially circular; 4) formed by connecting the centers of the circular cross-sections of a and b The straight line to be drawn is on the same plane iro. X, which is a plane that includes a straight line and is orthogonal to the plane Iro, is also orthogonal to a plane Hani that includes two straight lines formed by connecting the centers of the circular cross sections of C and D. On a plane iha including two straight lines formed by connecting the centers of the respective circular cross sections, an angle γ formed by two straight lines formed by connecting the centers of the respective circular cross sections of a and c is 90 °. And 135 °, 7) and the distance between two straight lines η and θ formed by connecting the centers of the circular cross sections of A and B is the direction of the opening of the U-shaped portion. A connecting clip for a resin concrete formwork, characterized in that the connecting clip narrows toward the front. 2. The connecting clip according to claim 1, wherein, when a straight line formed by the intersection of the flat surface and the flat surface is set to f, the center of the circular cross section of the inner portion of the L-shaped portion is connected. The distance between the position E and the straight line when the perpendicular is dropped from the position E corresponding to the midpoint in the length of the two lines on the straight line δ to the straight line is 40 mm or more, and the center of the circular cross section of the two The angle α formed by the straight line δ formed by connecting
Is within ± 5 mm. 3. Two straight lines η and θ formed by connecting the centers of the respective circular cross sections of A and B in the U-shaped portion.
Is greater than or equal to 2 °, and a U-shaped curve ε formed by connecting the center of the circular cross section of the bottom of the U-shaped portion
3. The resin-made resin according to claim 1, wherein a distance between the bottom portion and the straight line is 50 mm or more when a perpendicular is dropped from the bottom portion to a straight line. Connecting clip for concrete formwork. 4. A concrete form made of resin contains a monomer liquid A (solution A) comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst and an activator component of a metathesis polymerization catalyst. A monolithic side portion obtained by mixing a monomer solution (solution B) composed of a metathesis-polymerized cyclic olefin, injecting the raw material mixture into a mold, and causing polymerization and cross-linking reaction in the mold. A concrete form comprising a crosslinked polymer having the following:
4. The connecting clip for a resin concrete formwork according to 2 or 3.