JP6821638B2 - Fixing element fixing method by rotary construction - Google Patents

Description

In the present invention, when a fixing element such as an anchor bolt is retrofitted to a base material such as concrete, a fixing element fixing agent capsule containing a radical curable resin main agent is used, and the work is carried out by rotary construction without impact. Regarding the method of fixing the fixing element.

Generally, the following methods are used to fix fixing elements such as anchor bolts, anchor bars, and insert hardware to a concrete wall or the like. First, a predetermined hole is drilled in a base material such as reconcrete with a drill, and a capsule containing a resin (fixing agent) is inserted into the hole. After that, the resin capsule is broken by embedding the fixing element while rotating it while hitting it with an embedding machine, causing the fixing agent to flow out and harden in the hole, thereby fixing the fixing element to the hole.

Such a resin capsule for fixing a fixing element is enclosed in a cylindrical container made of glass or synthetic resin in a state where the main component composition of the radical curable resin and the curing agent are separated from each other. Then, when the container is destroyed when the fixing element is embedded, the radical curable resin main composition and the curing agent are mixed, so that curing proceeds and the fixing element is fixed. ..

However, in such a resin capsule, it is common to bury a fixed element by rotation / striking, and there is a problem that noise / vibration is generated at the time of striking. In particular, there is a big problem in construction in a residential area, and there is a problem that the time and period of construction are limited.

Therefore, the applicant has proposed the following Patent Document 1 as a resin capsule for fixing a fixing element for rotary construction, which can reduce the noise level during construction. In Patent Document 1, a radical curable resin main component composition and an aggregate are housed in a glass cylindrical container that can be crushed by rotation, and the radical curable resin curing agent is a main component composition. It is housed in an isolated state. Then, by adjusting the viscosity and thixotropy coefficient of the main ingredient composition, it is possible to perform rotary construction without impact. As the radical curable resin here, an epoxy acrylate resin, a polyester acrylate resin, an acrylic urethane resin, or an unsaturated polyester resin containing a styrene monomer can be used. Further, as the aggregate, an inorganic aggregate such as glass, ceramic, silica stone, or quartz, or an organic aggregate made of hard plastic such as hard vinyl chloride can be used.

Japanese Unexamined Patent Publication No. 2003-56074

In Patent Document 1, the noise level at the time of construction can be reduced by enabling the construction without hitting. However, since a hard material such as glass or ceramic is used as the aggregate, there is a problem in the mixing property of the material only by the rotary construction. Moreover, since a resin containing styrene is used as the radical curable resin, it also has an environmental problem.

By the way, the smaller the diameter of the hole to be drilled in concrete or the like when this kind of fixing agent is actually used, the faster the work can be performed, and the labor for the worker can be further reduced. However, when the hole diameter for embedding is reduced, the gap between the fixing element and the hole is reduced, and the resistance force due to the fixing agent is increased, so that the embedding force of the fixing element is required more than before. On the other hand, Patent Document 1 does not pay particular attention to the amount of the fixing agent with respect to the volume of the fixing element. Therefore, if the diameter of the hole is reduced, it cannot be accurately embedded only by rotary construction without impact as it is. Even if it is constructed only by rotary construction, the fixing force will decrease.

To solve this problem, the diameter of the resin capsule may be reduced as the diameter of the hole for embedding is simply reduced. However, if the diameter of the resin capsule is reduced, the area of adhesion to the base material such as concrete is reduced and the amount of the fixing agent is reduced, so that the fixing force (anchor strength) of the fixing element is also reduced.

Therefore, the present invention solves the above-mentioned problems, and an object of the present invention is only rotary construction without impact even if the work speed and the labor of the operator are improved by reducing the hole for burying the fixing element. It is an object of the present invention to provide a method for fixing a fixing element having a high fixing force.

As a means for that, the present invention breaks the resin capsule by drilling a predetermined hole in a base material such as concrete, inserting a resin capsule for fixing the fixing element into the hole, and then embedding the fixing element. A method of fixing the fixing element to the hole, wherein the resin capsule is contained in a glass cylindrical container that can be crushed by rotation, and a radical curable resin main component composition and a bone. The material and the curing agent of the radical curable resin are housed in a state of being isolated from the main agent composition, the aggregate is silica sand, and the outer diameter of the container is the fixing element. The volume of the main agent composition is 30 to 50% of the volume of the fixing element of the portion embedded in the hole, which is 0.94 to 1.02 times the diameter of the fixing. The element is embedded in the hole by rotary construction without impact.

As the radical curable resin, a radical curable resin containing no styrene is preferable. Specifically, acrylic-modified vinyl ester resin, urethane-modified vinyl ester resin, epoxy acrylate resin, polyester acrylate resin, acrylic resin, or unsaturated polyester resin, which do not contain styrene, can be used.

In the present invention, since silica sand is used as the aggregate, the kneadability with the resin is improved, and the fixing force is improved only by the rotary construction. It is known that silica sand is used as an aggregate in this type of resin capsule for fixing fixed elements, but there is a document that describes that silica sand has excellent kneadability among various aggregates such as glass and ceramics. not exist.

Further, in the present invention, the diameter of the container (resin capsule) is made smaller than before. Specifically, it is made as thin as 1.02 times or less with respect to the diameter of the fixing element (generally 1.03 times or more with respect to the diameter of the fixing element in the conventional resin capsule). As a result, the diameter of the hole for burying the fixing element to be drilled in the base material such as concrete can be reduced, and the work speed and the labor of the worker can be improved.

However, if it is left as it is, the resin resistance at the time of rotary construction increases, the adhesion area with the base material such as concrete decreases, and the amount of the fixing agent decreases, so that a sufficient fixing force may not be obtained. Therefore, by adjusting the volume of the main ingredient composition contained in the container to 30 to 50% of the volume of the fixing element of the portion embedded in the hole, it can be smoothly embedded even by rotary construction alone. It is possible to obtain an excellent fixing force (anchor strength).

Further, if a non-styrene resin is used as the radical curable resin, the generation of VOC, which is one of the causes of environmental problems, can be suppressed.

The resin capsule for fixing fixed elements used in the present invention has been developed for rotary construction that can secure a high fixing force (anchor strength) only by rotary construction, but at a work site where noise problems do not occur. It does not deny the construction by rotary impact.

It is sectional drawing of the resin capsule for fixing a fixing element.

Hereinafter, the present invention will be described in detail. As shown in FIG. 1, the fixing element fixing resin capsule (hereinafter, simply referred to as a resin capsule) 1 used in the present invention is a container 2 and a main component of a radical curable resin sealed and housed in the container 2. The composition 3, the curing agent 4, and the aggregate 5 are provided, and the main composition 3 and the curing agent 4 are housed in a state of being isolated from each other so that they do not come into contact with each other and react with each other.

The container 2 is a bottomed cylindrical cylindrical container, which has a certain rigidity (shape retention) for storage, and is made of glass that can be crushed by rotation. If the container 2 is made of glass, the radical curable resin sealed inside has lower permeability than the resin container, and is therefore suitable for long-term storage. The length of the container 2 is generally about 70 to 200 mm. The opening of the container 2 is sealed by a polyethylene cap 6.

Then, the diameter of the container 2 is set to 1.02 times or less, preferably 1.00 times or less, and more preferably 0.98 times or less with respect to the diameter of the fixing element. As a result, the diameter of the hole for burying the fixing element to be drilled in the base material such as concrete can be made smaller than before. On the other hand, when the diameter of the container 2 is 1.03 times or more, the gap between the fixing element and the hole becomes small when the hole diameter for embedding the fixing element to be drilled in the base material is reduced, and the resistance due to the fixing agent Since the force increases, the force for embedding the fixed element is required more than before, so that the hole diameter for embedding the fixed element cannot be reduced to improve the work efficiency. The lower limit of the diameter of the container 2 is not particularly limited, but may be 0.85 times or more, preferably 0.90 times or more the diameter of the fixing element in relation to the amount of resin described later.

The radical curable resin is not particularly limited, and basically all known resins conventionally used in this type of resin capsule can be used. Specific examples thereof include epoxy acrylate resin, polyester acrylate resin, acrylic urethane resin, and unsaturated polyester resin. Reactive monomers can be mixed and used in these radical curable resins.

Above all, it is preferable to use a non-styrene type resin having a low environmental load. Specifically, it is preferable to use an acrylic-modified vinyl ester resin, a urethane-modified vinyl ester resin, an epoxy acrylate resin, a polyester acrylate resin, an acrylic resin, or an unsaturated polyester resin, each of which does not contain a styrene monomer. In particular, an acrylic modified vinyl ester resin is preferable. The acrylic-modified vinyl ester resin has a higher adhesive force than other resins and has a low transmittance for a polyethylene cap, so that it can be stored for a long period of time. The main component composition of the radical curable resin means all uncured resin components other than the curing agent.

These radical curable resins contain polymerizable monomers, but in the present invention, monomers other than styrene-based monomers are preferable. Specifically, a (meth) acrylic monomer is used. Examples of the (meth) acrylic monomer which is a polymerizable monomer include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isodecyl (meth) acrylate. , Lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, furfuryl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) Acrylate, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, 2-Methacryloxyethyl 2-hydroxypropylphthalate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, glycidyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene Glycoldi (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, 1,10-decanediol di (Meta) acrylate, trimethylolpropane tri (meth) acrylate, glycerindi (meth) acrylate, methoxytriethylene glycol (meth) acrylate, butoxyethyl (meth) acrylate, neopentyl glycol di (meth) acrylate, trifluoroethyl ( Examples thereof include meta) acrylate, perfluorooctylethyl (meth) acrylate, allyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopentenyloxyethyl (meth) acrylate. One of these may be used alone, or two or more thereof may be mixed.

The (meth) acrylic monomer is preferably contained in an amount of 10 to 80% by weight, more preferably 20 to 60% by weight, based on the total amount of the main ingredient composition 3. If the content of the acrylic monomer is less than 10% by weight, the degree of polymerization of the radical curable resin is insufficient and the fixing force is lowered. On the other hand, even if it exceeds 80% by weight, there is no big difference in the fixing force, which is a waste of cost.

Further, the base composition 3 contains a thixotropy agent and an esterification catalyst, if necessary, within a range that does not impair the effects of the present invention (for example, about 0.01 to 5% by weight based on the total amount of the base composition 3). Additives such as polymerization inhibitors, radical generators, curing accelerators, colorants, pigments, ultraviolet absorbers, and surfactants can be added and mixed.

Examples of the thixotropy agent include fine powder silica, powderless alumina, talc, asbestos, colloidal hydrous aluminum silicate organic composite, bentonite, castor oil derivative and the like.

As the esterification catalyst, a commonly used catalyst can be used, and a tertiary amine such as triethylamine, dimethylbenzylamine, or tributylamine; a quaternary ammonium salt such as trimethylbenzylammonium; an inorganic salt such as lithium chloride or chromium chloride. Imidazole compounds such as 2-ethyl-4-methylimidazole; tetraphenylphosphine bromide, tetramethylphosphonium chloride, diethylphenylpropylphosphonium chloride, triethylphenylphosphonium chloride, benzyltriphenylphosphonium chloride , Phosphonium salts such as dibenzylethylmethylphosphonium chloride, benzylmethyldiphenylphosphonium chloride; phosphines such as triphenylphosphine and tritrilphosphine; tetrabutylurea; triphenylstibin and the like. Only one kind of these catalysts may be used, or two or more kinds may be appropriately mixed and used.

The polymerization inhibitor may be any one capable of suppressing the polymerization reaction of the product or unsaturated monobasic acid due to the epoxidation reaction. For example, 4-methoxyphenol, hydroquinone, methylhydroquinone, methoxyhydroquinone, tert- Butyl hydroquinone, benzoquinone, catechol, copper naphthenate, copper powder and the like can be used. One of these may be used alone, or two or more thereof may be mixed.

As the radical generator, an organic peroxide or an azo compound can be used. Examples of organic peroxides include ketone peroxides, peroxyketals, hydroperoxides, diallyl peroxides, diacyl peroxides, peroxyesters and peroxydicarbonates. Specific examples include, for example, benzoyl peroxide, dicumyl peroxide, diisopropyl peroxide, di-t-butyl peroxide, t-butylperoxybenzoate, 1,1-bis (t-butylperoxy) -3,3. , 5-trimethylcyclohexane, 2,5-dimethyl-2,5-bis (t-butylperoxy) hexin-3,3-isopropylhydroperoxide, t-butylhydroperoxide, dicumyl peroxide, dicumylhydro Peroxide, acetyl peroxide, bis (4-t-butylcyclohexyl) peroxydicarbonate, diisopropylperoxydicarbonate, isobutyl peroxide, 3,3,5-trimethylhexanoyl peroxide, lauryl peroxide, dicumylper Examples thereof include oxide, di-t-butyl peroxide, t-butyl hydroperoxide, azobisisobutyronitrile, and azobiscarboxylicamide. One of these may be used alone, or two or more thereof may be mixed.

Examples of the curing accelerator include N, N-dimethylaniline, N, N-diethylaniline, N, N-dimethyl-P-toluidine, N, N-dihydroxypropyl-P-toluidine, N, N-dihydroxypropyl-P-. Examples thereof include aromatic anilines such as toluidine and N, N-dihydroxyethyl-P-toluidine, metal soaps such as cobalt naphthenate, and chelate compounds such as vanadylacetylacetonate. Only one kind of these curing accelerators may be used, or two or more kinds may be mixed.

The aggregate 5 adjusts the rotational resistance at the time of rotational construction. As the aggregate 5, silica sand is used. According to this, the kneadability with the resin material is higher than that of other aggregates generally used conventionally, and as a result, the fixing force is improved. The silica sand may be a natural product obtained by weathering granite or quartzite, or artificial silica sand obtained by crushing silica stone. The content of the aggregate 5 may be about 20 to 80% by weight, preferably 40 to 60% by weight, based on the weight of the main ingredient composition 3. This is because if the content of the aggregate 5 is less than 20% by weight, the rotational resistance with respect to the fixing element is too small, and if it exceeds 80% by weight, the rotational resistance becomes too large.

The curing agent 4 is housed with a partition wall 7 that avoids contact with the main agent composition 3. Specifically, it can be stored in a hollow tubular isolation container that does not react with the main agent composition 3, or can be stored in a state of being wrapped by a cured film of a radical curable resin. Examples of the curing agent 4 include hydrooxides such as cumene peroxide, dialkyl peroxides such as dicumyl peroxide, diacyl peroxides such as benzoyl peroxide, ketone peroxides such as methyl ethyl ketone peroxide, and bis- ( 4-t-Butylcyclohexyl) Peroxyketals, organic peroxides such as peroxyesters such as t-butylperoxybenzoate, and organic peroxides such as dicyclohexylphthalate, calcium carbonate, etc. Those diluted with an inorganic substance such as calcium sulfate can also be used. One of these may be used alone, or two or more thereof may be mixed.

Examples of the curing agent diluent include inorganic substances such as calcium sulfate and calcium carbonate, dimethylphthalate, dibutylphthalate, dicyclohexylphthalate, dioctylphthalate, aliphatic hydrocarbons, aromatic hydrocarbons, silicone oil, liquid paraffin polymerizable monomer, water and the like. Can be mentioned. One of these may be used alone, or two or more thereof may be mixed.

The curing agent 4 is preferably contained in an amount of 1 to 70% by weight based on the weight of the main ingredient composition 3. If it is less than 1% by weight, the amount of the curing agent is too small and it is difficult to obtain a sufficient cured state of the radical curable resin. If it exceeds 70% by weight, problems occur in the moldability and strength of the cured molded product. This is because it becomes easier. The content of the curing agent 4 is preferably 3 to 30% by weight, more preferably 5 to 10% by weight, based on the weight of the main ingredient composition 3.

Further, additives such as thixotropy agent, diluent, and plasticizer can be added and mixed to the curing agent 4 as needed, as long as the effects of the present invention are not impaired.

According to the resin capsule 1 of the present invention, low noise, that is, low noise level and short noise generation time can be easily obtained by rotary construction without impact. For this reason, unlike the conventional method, the construction time zone, construction time, and construction location are not restricted due to noise, and the fixed element is avoided while avoiding the influence of noise on neighboring residents and residents who perform construction. It is possible to carry out fixing work and construction of seismic structural members.

For example, the noise can be suppressed to 60 dB or less by performing the construction using a rotary tool for rotary construction whose output is preferably 600 W or less without impact. In addition, the rotation construction time can be shortened as compared with the subordinate, and it can be actually performed in about 10 seconds. Such a noise reduction effect is remarkably exhibited among the fixing elements, particularly those having an outer diameter of about 16 mm to 22 mm. These sizes are the sizes of anchor bars suitable for use in seismic structure addition works. The noise can be measured by a sound level meter conforming to JIS C1502 according to the conditions specified in JIS Z8731. If the work site does not cause noise problems, it can be constructed by rotary impact.

In addition, the volume of the main ingredient composition 3 contained in the container 2 (resin capsule 1) is the volume of the fixed element of the portion embedded in the hole for burying the fixed element drilled in the base material such as concrete. And adjust so that it becomes 30 to 50%. If the accommodating amount (volume amount) of the main agent composition 3 is less than 30% with respect to the volume of the fixing element, the absolute amount of resin is insufficient and high fixing force cannot be obtained. On the other hand, if it exceeds 50%, the resin resistance at the time of embedding the fixed element increases, so that it cannot be accurately embedded only by the rotary construction without impact, and if it is performed only by the rotary construction, the fixing force decreases. To do.

A cylindrical glass container having the external dimensions shown in Table 1 and one of which was sealed was filled with the styrene-free uncured resin composition shown in Table 1 in the amount shown in Table 1 and separately contained in a glass tube. , Insert a curing agent tube containing 0.8 g of benzoyl peroxide, further fill with 11.5 g of natural glass sand of an appropriate particle size, and seal with a polyethylene cap to obtain a resin capsule for fixing fixed elements. It was.

Using these, drill holes of the sizes shown in Table 1 in concrete with a concrete drill, clean the inside of the holes, insert each resin capsule into the holes, and use a rotary drill to drill the diameters shown in Table 1. The anchor muscle was embedded to the bottom of the hole only by rotation. Table 1 shows the time required to embed the anchor muscles to the bottom of the hole at that time.

After the anchor embedding was completed, the anchor was cured and cured for 24 hours, and then the pull-out strength of the anchor was measured. Along with the results, the adhesion strength and fracture pattern of the adhesive are also shown in Table 1.

From the results in Table 1, the outer diameter of the container (resin capsule) is 1.02 times or less of the diameter of the fixing element, and the volume of the main ingredient composition is embedded in the holes formed in the base material. It was confirmed that in Examples 1 to 12, which were 30 to 50% of the volume of the fixed element of the portion, the construction time was short and the fixing force was good. In particular, comparing Example 12 using a thick anchor bar having a diameter of 24 mm and Comparative Example 3, the construction time can be shortened in Example 12 by reducing the diameter of the hole for burial. Further, even in Examples 1 to 12 of only rotary construction, the same fixing force (anchor muscle strength) as that of the reference example constructed by the same rotary impact as in the conventional case was provided.

On the other hand, in Comparative Example 1, the volume of the main ingredient composition exceeds 50% with respect to the volume of the fixing element of the portion embedded in the hole, and in Comparative Example 2, the outer diameter of the container (resin capsule) The anchor strength was low because was more than 1.02 times the diameter of the fixed element.

1 Resin capsule 2 Container 3 Main composition 4 Hardener 5 Aggregate

Claims (1)

A predetermined hole is drilled in a base material such as concrete, a resin capsule for fixing a fixing element is inserted into the hole, and then the resin capsule is destroyed by embedding the fixing element to fix the fixing element to the hole. It is a method of fixing fixed elements.
The resin capsule contains a radical curable resin main ingredient composition and an aggregate in a glass cylindrical container that can be crushed by rotation, and the radical curable resin curing agent contains the radical curable resin main ingredient composition. It is housed in isolation from objects and
The aggregate is silica sand,
The outer diameter of the container is 0.94 to 1.02 times the diameter of the fixing element.
The volume of the main agent composition is 30 to 50% with respect to the volume of the fixing element of the portion embedded in the hole.
A method for fixing a fixing element, which comprises embedding the fixing element in the hole by rotary construction without impact.

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