JPH0220782B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a method for preventing warpage of a floorboard of a sound insulating floor. Conventionally, a so-called wet floating floor construction method has been implemented as one of the construction methods for blocking floor impact noise. This is a construction method in which glass wool, rock wool, or a similar flexible material (buffer material) is installed around the walls of the building frame and on top of the floor, the entire surface is covered with a waterproof sheet, and then concrete is poured to form the floor. The weight of concrete and the spring characteristics of the cushioning material form a vibration-proof structure that blocks floor impact noise. In this case, there is no restraint around the floating floorboards, so the concrete that has been poured will warp as the water dries from the surface, and often does not return to its original state even after drying. In order to finish the sled, the top part of the sled had to be re-repaired by sanding. Various methods have been considered to prevent this warping, such as installing support rods on the surface of the floating floorboards above the ceiling, or attaching jigs to the wall to restrain the floating floorboards from now on. However, when there were a large number of rooms, a considerable number of rods and jigs were required, and they also had the disadvantage of interfering with other construction work, such as interior decoration. There is also a method of directly joining the floor of the building structure and the floating floorboards using anchors, etc., but although this method prevents warping, the vibrations applied to the floor are transmitted to the floor of the structure through the anchors. This is undesirable as it will cause the floating floor to become stagnant and impair the effect of the floating floor. In addition, a method of arranging reinforcement in poured concrete to effectively prevent warpage deformation has been implemented, but this method has the disadvantage that it is hardly effective when the pouring area becomes large. The present invention solves the above-mentioned drawbacks and provides a method for preventing warping of floating floorboards, and its gist is as follows:
In the floating floor construction method, in which cushioning material is laid on the upper surface of the floor that makes up the building frame, and cement concrete is poured on top of it through a waterproof sheet, the general formula RO(AO)nH (1) is used in the cement concrete to be poured. (In the formula, R is an alkyl group having 1 to 7 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms, and A is a cycloalkyl group having 2 to 6 carbon atoms.
one or two alkylene groups of 3, n is 1 to 10
is the number of ) A method for preventing warping of floating floorboards, which is characterized by blending a compound represented by: In the present invention, the compound represented by general formula (1) is
It can be easily obtained by adding alkylene oxide such as ethylene oxide and/or propylene oxide to an alcohol having 7 or less carbon atoms. In the general formula (1), R is an alkyl group having 1 to 7 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms. Such groups include methyl group, ethyl group,
n-propyl group, isopropyl group, n-butyl group, isobutyl group, n-pentyl group, isopentyl group, cyclopentyl group, cyclohexyl group, n
-hexyl group, isohexyl group, n-heptyl group and isoheptyl group. Considering the effect of preventing cement warpage of these groups, the carbon number is 1~
5 is preferably an alkyl group or a cyclohexyl group, particularly a butyl group. In the case of an alkyl group having 8 or more carbon atoms, the solubility in water may decrease, and furthermore, if a large amount of alkylene oxide is added to the extent that it becomes sufficiently water-soluble, properties as a surfactant may not be expressed. , the foaming property becomes high, which is not preferable.
If a foamy compound is mixed with cement to make concrete, air will be entrained in the concrete, which may lead to a significant decrease in strength. A is an alkylene group having 2 to 3 carbon atoms, and examples thereof include an ethylene group and/or a proprene group. Also, n (number of moles of alkylene oxide added)
is from 1 to 10. When n is less than 1, there is a problem that when mixed with cement, the anti-warping effect is small and the volatility of the alcohol becomes significant.
If n is more than 10, the warping prevention effect will be reduced and air will be entrained in the concrete, which is undesirable. The above n has a preferable range depending on the type of alkylene oxide to be added. For example, when ethylene oxide is used as the alkylene oxide, it is preferably used in an amount of 1 to 5 moles per mole of alcohol in terms of anti-warp effect, odor, amount of air entrainment, etc. When propylene oxide is used as the alkylene oxide, it is preferably used in an amount of 1 mole per mole of alcohol from the viewpoint of anti-warp effect and economical efficiency. Further, when ethylene oxide and propylene oxide are used together as alkylene oxides, the number of moles added is usually 2 to 10 moles per mole of alcohol. At this time, C ₂ H ₄ O/
The molar ratio of C ₃ H ₆ O is preferably within the range of 0.2 to 5.0 from the viewpoint of low foaming properties and warpage prevention effect. When used in combination, alkylene oxide may be added by either random addition or block addition, both of which provide the same effect from the standpoint of preventing warpage, but random addition is preferred from the standpoint of low foaming. The compound represented by general formula (1) is obtained by adding ethylene oxide and/or propylene oxide to alcohol as described above,
This compound is an alkylene oxide obtained by co-adding other oxides such as butylene oxide and styrene oxide with an alkylene oxide having 2 to 3 carbon atoms to the extent that performance is not impaired (usually 50% by weight or less of the total oxyalkylene group). It's okay to be hot. Examples of the compound represented by the above general formula (1) include CH ₃ O-(C ₂ H ₄ O-) ₃ H, CH ₃ O-(C ₃ H ₆ O-) ₁ H,
C ₂ H ₅ O− (C ₂ H ₄ O−) ₁ H, CHO− (C ₃ H ₆ O−) ₁ H,
C ₂ H ₅ O− (C ₂ H ₄ O) ₄ (——C ₃ H ₆ O−) ₄ H, n−C ₃ H ₇ O
−(C ₂ H ₄ O−) ₅ H, i−C ₃ H ₇ O−(C ₃ H ₆ O−) ₁ H, i−
C ₃ H ₇ O− (C ₂ H ₄ O) ₅ (——C ₃ H ₆ O−) ₁ H, n−C ₄ H ₉ O
−(C ₂ H ₄ O−) ₃ H, i−C ₄ H ₉ O− (C ₃ H ₆ O−) ₁ H, n−
C ₄ H ₉ O− (C ₂ H ₄ O) ₂ (――C ₃ H ₆ O−) ₈ H, n−C ₅ H ₁₁ O
−(C ₂ H ₄ O−) ₂ H, i−C ₅ H ₁₁ O−(C ₂ H ₄ O) ₄ (――――
C ₃ H ₆ O−) ₂ H,

【formula】

[Formula] i-C ₆ H ₁₃ O- (C ₂ H ₄ O-) ₄ H, n-C ₇ H ₁₅ O- (C ₂ H ₄ O) ₃ - (C ₃ H ₄ O-)
₅ H, i−C ₇ H ₁₅ O−(C ₂ H ₄ O−) ₄ H, n−C ₆ H ₁₃ O−(
Examples include C ₂ H ₄ O−) ₅ H. However, of course, the present invention is not limited to these compounds, and any compound corresponding to general formula (1) can be used. In the present invention, one kind or a mixture of two or more kinds of compounds represented by the general formula (1) can be used, and a diluent (such as water) can also be added thereto. Examples of the cement that can be used in the present invention include ordinary Portland cement, early strength Portland cement, moderate heat Portland cement, alumina cement, blast furnace cement, and fly ash cement. Among these, preferred are ordinary Portland cement and early strength Portland cement. The amount of the compound of general formula (1) added in the present invention is:
Although it can be varied depending on the number of carbon atoms in the alkyl group of the compound, the number of moles of alkylene oxide added, etc., it is usually 0.5 to 10% by weight based on the cement.
Preferably it is 1.5 to 5% by weight. If the amount added is less than 0.5% by weight, the warpage prevention effect will be small, while if it exceeds 10% by weight, the strength of concrete etc. will be about 2/3 or less compared to that without additives, which is not sufficient for practical use. The amount of water used to harden the cement may be any amount necessary for hardening the cement, and the amount of water/the amount of cement is usually 29-90% by weight, preferably 30-90% by weight.
It is sufficient if the amount is 70% by weight. When mixing cement, add pebbles, if necessary.
Aggregates such as sand, pumice, and calcined perlite can be used. The amount of aggregate is such that the amount of cement/the amount of aggregate is usually 10 to 200% by weight, preferably 15 to 100% by weight. At this time, the amount of admixture is usually 0.5 to 10% by weight based on the cement, and usually 0.1 to 10% based on the total weight of the admixture, water and aggregate.
It is 5% by weight. In addition, other components (optional) may be blended, such as metal chlorides such as calcium chloride and sodium chloride; metal sulfates such as sodium sulfate; and known cement hardening accelerators such as organic amines such as triethanolamine. Agents: Known cement hardening retardants such as alcohols, sugars, starch, cellulose, and glycerin; Known reinforcing steel rust preventive agents such as sodium nitrite and calcium nitrite; Lignosulfonic acid, oxycarboxylic acid, naphthalenesulfonic acid formalin condensation Various agents such as well-known cement dispersants can be blended. The amounts of these optional ingredients are usually the same for cement.
It is 0.1 to 5% by weight. In the present invention, the means for adding the compound represented by the general formula (1) may be the same as in the case of cement admixtures that are generally used. For example, an appropriate amount of the above compound is mixed in advance with mixing water, Means such as kneading cement and aggregate beforehand, or adding an appropriate amount of the above-mentioned compound during kneading of a mixture of cement, aggregate and water can be adopted. According to the present invention, concrete floorboards containing the compound of general formula (1) do not warp when drying. Therefore, there is no need for a finishing step to correct and smooth the surface after construction, so the time and effort required for this can be omitted, and floating floor construction can be carried out efficiently. Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Examples and Comparative Examples The floating floor construction method was constructed in two rooms measuring 8 x 4 m. At this time, one room was filled with concrete containing CH ₃ O-(C ₂ H ₄ O-) ₃ H, and the other room was filled with concrete containing no CH ₃ O-(C ₂ H ₄ O-) ₃ H. Each was installed.
The mix of concrete compositions other than CH ₃ −(C ₂ H ₄ O−) ₃ H is as follows and is the same for both concretes.

[Table] In concrete containing CH ₃ O−(C ₂ H ₄ O−) ₃ H, 3% by weight of CH ₃ O−(C ₂ H ₄ O−) ₃ H was added to the weight of cement. . Note that the amount of kneading water at this time was reduced by the weight of CH ₃ O-(C ₂ H ₄ O-) ₃ H added. The drawings show the structure of the floating floor, and in the case of this example and comparative example, the thickness of the cushioning material (glass wool) 1 is 25 mm,
The thickness of the waterproof sheet 2 is 0.15 mm, the thickness of the concrete 3 is 50 mm, and the reinforcement reinforcing bars 4 (3.2 mmφ, mesh size
100×100mm) were placed in a single layer in the center of concrete 3. The results after being left for one month were as follows. The warpage of the concrete floor plate containing CH ₃ O−(C ₂ H ₄ O−) ₃ H was approximately 1 mm in large places. Therefore, even when construction errors were taken into account, almost no warping occurred, and the surrounding area remained at almost the same level as when it was poured, and no warping that would impede the finishing of the floor material occurred. On the other hand, in concrete floor plates that do not contain CH ₃ O− (C ₂ H ₄ O−) ₃ H, the warpage at the edges is on average 10 to 15 mm, and the warped parts must be made to the same level as the surrounding areas by some method. It was necessary to carry out construction work.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing the structure of the floating floor. 1...Buffer material, 2...Waterproof sheet, 3...Concrete, 4...Reinforcement reinforcing bars.

Claims (1)

[Scope of Claims] 1. In the floating floor construction method in which a cushioning material is laid on the upper surface of the floor constituting the building frame and cement concrete is poured on top of it through a waterproof sheet, the general formula RO is used in the cement concrete to be poured. (AO)nH (1) (wherein, R is an alkyl group having 1 to 7 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms, and A is a cycloalkyl group having 2 to 6 carbon atoms.
one or two alkylene groups of 3, n is 1 to 10
is the number of ) A method for preventing warping of floating floorboards, which is characterized by incorporating a compound represented by: