JPH05209445A - Stacking-up construction for concrete block - Google Patents

Abstract

PURPOSE:To improve workability by bonding blocks to each other with one- component urethane resin for making an NCO group including quantity specific, when the hollow concrete blocks are stacked up, and by placing mortar after reinforcements are arranged in the hollow sections of the blocks. CONSTITUTION:The adhesives of one-component urethane foam resin system or the like including the NCO group of 4-25% is set. After that, with the use of this, a plurality of hollow concrete blocks are bonded to each other to be stacked up. After that, reinforcements are arranged in the hollow sections of the blocks, and then, mortar is placed to be hardened. Then, by the adhesives, water content in air is absorbed, and carbonic acid gas is generated, and the adhesives is expanded to be hardened in a short time, and the small quantity of the adhesives is enough, and bonding can be prevented from being deteriorated due to compounding error, and the storing stability of the adhesives can be improved, and work can be executed quickly and easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block stacking method for stacking a plurality of hollow concrete blocks to construct a building or structure.

[0002]

2. Description of the Related Art Conventionally, it has been known that concrete blocks (hereinafter abbreviated as "blocks") are piled up to construct a wall surface, a fence, etc., but generally, iron bars are arranged at desired positions at appropriate positions. Are placed to form a concrete foundation, and fresh concrete is placed on it, and then the block is placed repeatedly to build a block fence.

Since the number of skilled workers who can perform such complicated work has decreased in recent years, as a simple method which does not require much skill, it is possible to omit placing fresh concrete between blocks and stack the blocks. After that, a method of pouring ready-mixed concrete into the cavity of the block and hardening it has been adopted.

[0004]

In the above construction method, the blocks are simply stacked,
There is a risk that the part without the horizontal bar may fall or collapse. Further, there are drawbacks such as contact with an operator, collapse of blocks due to impact when pouring ready-mixed concrete, and displacement of installation position. In order to solve such a drawback, a method of using a support material such as plates from both sides of the stacked blocks is adopted, but it takes time and effort to manufacture the support material, and after the work is completed. Has to remove the supporting material and requires an extra work, so that there is a problem that a quick and simple construction cannot be performed.

In view of the above problems, according to the present invention, a small amount of one-component urethane resin adhesive is used as an adhesive for adhering a plurality of stacked hollow concrete blocks to each other. It does not have the risk of causing adhesion failure accidents due to formulation mistakes like two-component adhesives, but it has excellent storage stability despite a short curing time, and is quick and easy. The purpose is to provide a concrete block loading method that can perform various types of construction.

[0006]

In order to achieve the above-mentioned object, a concrete block hoisting method according to the present invention uses a one-component urethane resin-based adhesive to mutually stack a plurality of hollow concrete blocks. While gluing,
It is characterized by pouring mortar after arranging reinforcing bars in the cavity formed by stacking the hollow concrete blocks. As a one-component urethane resin adhesive, 4% to 25% of NCO is used. The one with a group content is used.

The one-component moisture-curable urethane resin adhesive will be described below. Moisture-curable urethane resin-based adhesives should be produced by blending the urethane polymer obtained by the reaction of polyol and polyisocyanate with a catalyst for adjusting the curing time and various additives as necessary. You can

As the polyol, a conventionally known one can be used. For example, low molecular weight polyols (ethylene glycol, propylene glycol, glycerin, trimethylolpropane, triethanolamine, pentaerythritol, sorbitol, etc.), water, low molecular weight polyols and polyamines (ethylenediamine, diethylenetriamine tolylenediamine, etc.), and alkylene oxides (ethylene oxide). , Propylene oxide, etc.) is added to the polyether polyol. A polyester polyol obtained by reacting a dicarboxylic acid (succinic acid, maleic acid, sebacic acid, adipic acid, fumaric acid, phthalic acid, dimer acid, etc.) with the low molecular weight polyol. Lactone (γ
-Butyl lactone, epsilon-caprolactone, etc.). Polytetramethylene glycol obtained by ring-opening polymerization of tetrahydrofuran. Castor oil or its alkylene oxide addition modified product. As a polymer of a diene compound (butadiene, isoprene, etc.), a polydiene polyol having a hydroxyl group at a terminal or a hydrogenated product thereof can be mentioned. These polyols can be used alone or as a mixture of two or more kinds.

As the polyisocyanate, conventionally known ones can be used. For example, aromatic polyisocyanates (2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, polymethylene polyphenylene Polyisocyanate etc.). Aliphatic polyisocyanates (hexamethylene diisocyanate, etc.). Alicyclic polyisocyanate (3-isocyanatomethyl-
3,5,5-trimethylcyclohexyl isocyanate, 4,4'-cyclohexylmethane diisocyanate, etc.). There are examples of arylaliphatic polyisocyanates (xylyldiisocyanate and the like) and carbodiimide-modified or isocyanurate-modified polyisocyanates thereof, and these polyisocyanates can be used alone or as a mixture of two or more thereof. Among them, aromatic polyisocyanate is preferable, and particularly preferable one is
4,4'-diphenylmethane diisocyanate, 2,
4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate and the like.

The ratio of polyol to polyisocyanate is usually 1.5 equivalents of polyisocyanate to 1 equivalent of polyol, preferably 1.7 to 5 equivalents. The urethane polymer is usually obtained by heating and stirring a polyol and a polyisocyanate at 30 ° C to 120 ° C, and a preferable temperature is 50 ° C to 100 ° C.

As the catalyst, a catalyst having excellent storage stability of the adhesive obtained by blending, for example, bis (morpholinoethyl) ether, bis (2,6-dimethylmorpholinoethyl) ether and other bismorpholinoethyl ethers, Tris. (2,6-Dimethylmorpholinoethyl) amine, bis (dimethylaminoethyl) ether and the like are used.
Although the amount of the catalyst used varies depending on the curing time and the type of the catalyst used, it is usually 0.01 to 5 parts by weight, particularly 0.05 to 3 parts by weight, relative to 100 parts by weight of the urethane polymer. Weight parts are preferred.

Various additives are used as necessary,
Examples of additives include fillers (calcium carbonate, titanium dioxide, carbon black, inorganic fillers such as clay, hollow organic polymers, etc.), thixotropic agents, defoamers, antioxidants, ultraviolet absorbers, colorants ( Pigments, dyes), stabilizers, etc.

The NCO content of the adhesive is 4% to 20%, preferably 8% to 20%. If it is 4% or less, the foaming of the adhesive will be less and the effect of filling the cavity of the block will be too small, so a large amount of adhesive will be required, and if it is 20% or more, the cured product of the adhesive will be. Is fragile. Adhesive viscosity is 10 ps to 5
It is 000 ps.

In the urethane resin composition, a catalyst, a stabilizer and various additives may be added to the urethane prepolymer, but when the urethane prepolymer is manufactured, a part of the catalyst, the stabilizer and various additives may be added in advance. You may add the whole amount.
The urethane resin composition containing a catalyst and various additives is filled and stored in a container capable of blocking moisture (eg, can, cylindrical container (cartridge) laminated with aluminum, tube, bag, etc.). If necessary, the container is opened and filled, coated and coated by a usual method, and then cured by reacting with moisture in the air or water.

[0015]

Next, the operation of the concrete block loading method according to the present invention will be described. The one-pack type moisture-curable urethane resin-based adhesive used in the method of the present invention reacts with moisture in the air to generate carbon dioxide gas and cures while expanding.
The catalyst is used for controlling the time of the curing reaction, but usually, when the curing time is shortened, the storage stability of the adhesive becomes poor, and the selection of the catalyst is important for making the adhesive. The filler is then used to control the viscosity and flowability of the adhesive.

[0016]

EXAMPLES Examples of the concrete block loading method according to the present invention will be described below. (Example 1) (One-component moisture-curable urethane resin adhesive) MEIWASOL CX-3H5 CONC (Meiwa Yuka Kogyo Co., Ltd. urethane polymer NCO content 16%
1000 parts, Samprene NCG-1000 (Sanyo Chemical Co., Ltd. urethane polymer) 15 parts, Aerosil 200 (Nippon Aerosil Industry Co., Ltd.) 30 parts,
30 parts of Expancel 551DE (Nihon Philite Sales Co., Ltd.) in a universal mixer at 50 ° C to 60 °
Mix at C for 1 hour. Then, 3 parts of bis (2,6-dimethylmorpholinoethyl) ether was added and mixed for another hour. The NCO content of the adhesive thus obtained is 15
%, Viscosity 4000 ps to 5000 ps (25 ° C.). (Example 2) MEIWASOL CX-3H5 CON
C (Maywa Yuka Kogyo Co., Ltd. urethane polymer NCO
Content of 16% 1000 parts and bis (2,6-dimethylmorpholinoethyl) ether 3 parts were added and mixed for an additional hour, the NCO content of the adhesive was 16%, viscosity 100 ps.
(25 ° C).

Blocks were adhered using the one-component moisture-curable urethane resin-based adhesive thus obtained, and all were cured in 30 minutes, and good adhesive strength could be obtained. And even when the fresh concrete was poured into the cavity of the block, the block did not fall or collapse.

[0018]

The concrete block hoisting method according to the present invention is constructed as described above and has the following effects. That is, a plurality of hollow concrete blocks that have been stacked are adhered to each other with a one-component urethane resin adhesive, and after reinforcing bars are laid in the cavities formed by stacking the concrete blocks, mortar Since the urethane resin-based adhesive is a resin that is poured in, the urethane resin-based adhesive generates carbonic acid gas due to the moisture in the air and hardens in a short time while expanding, so it is only necessary to use a small amount of adhesive. As described above, there is no fear of causing adhesion failure due to a mistake in the composition. In addition, it has excellent storage stability even though the curing time is short, and it has an excellent feature that quick and simple construction can be performed.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical indication location E04B 2/02 (72) Inventor Takeshi Yamaguchi 5-chome Mitsuigaoka, Neyagawa-shi, Osaka 1-89-102 (72) Inventor Shuichiro Furuya 3-16 Karigigaoka, Hirakata-shi, Osaka B-8-301

Claims (2)

[Claims] 1. A plurality of hollow concrete blocks that have been stacked are adhered to each other with a one-component urethane resin adhesive, and reinforcing reinforcing bars are arranged in the cavities formed by stacking the hollow concrete blocks. After that, the concrete block loading method is characterized by pouring mortar. 2. The concrete block stacking method according to claim 1, wherein a one-component urethane resin-based adhesive having a —NCO group content of 4% to 25% is used.