JPH0259253B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to a self-leveling construction method, and more specifically, a slurry of gypsum, portland cement, or other hydraulic cement material (slurry for cast flooring) is poured onto the subfloor of a structure, and then the slurry is subjected to a specific treatment. This relates to a self-leveling method that forms a horizontally smooth surface with high level accuracy. Conventionally, in the self-leveling method, in order to improve the level accuracy of the floor surface, hydraulic cement slurry is poured onto the sub-floor, and then the surface of the newly formed slurry layer is coated with a plastering tool such as a dragonfly or a trowel. It is being used and leveled. However, in this construction method, after pouring cement slurry onto the sub-floor, within a short period of time, a film (formed due to drying and hardening of the slurry surface) on the surface of the slurry with different properties from the slurry inside. (a thin film that is a surface film that is much more cured than the internal slurry)
This film is troublesome, and the plastering method described above cannot provide sufficient level precision to the surface of the newly formed slurry layer, especially when the construction area is large or the pouring thickness is thin. In some cases, or in cases where there are joints due to the large construction area, it is difficult to obtain a horizontally smooth surface with high level accuracy even with experienced plastering techniques. In view of these circumstances, the present inventors conducted various studies in an attempt to improve the level accuracy of a newly formed floor surface in a self-leveling method more advantageously than before, and found that after pouring hydraulic cement slurry, The inventors have discovered that the object can be achieved by stirring and mixing the slurry with an appropriate device to homogenize it while the slurry is still in a fluid state, and have arrived at the present invention. That is, the present invention provides a self-leveling method in which a slurry of hydraulic cement is poured onto the subfloor of a structure to form a smooth floor surface, and the slurry still remains in a fluid state after being poured onto the subfloor. This relates to a self-leveling method characterized by stirring and mixing the slurry to homogenize it while the slurry is in use. The hydraulic cement used in the method of the present invention is one that has been normally used in conventional self-leveling construction methods, and is based on gypsum or inorganic cements. Examples of gypsum-based cement include α Those based on hemihydrate gypsum, beta hemihydrate gypsum, type anhydrous gypsum, etc., and inorganic cements include, for example, ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, moderate heat Portland cement, and special Portland cement. , blast furnace cement, flyash cement, rapid hardening cement, alumina cement, etc. can be exemplified. These cement base materials are usually mixed with aggregates such as river sand, mountain sand, sea sand, silica sand, various lightweight aggregates, various slags, fly ashes and other aggregates, and if necessary, this type of self-leveling. Additives such as various dispersants, thickeners, expansion inhibitors, shrinkage inhibitors, antifoaming agents, and setting regulators that are commonly used in construction cement are blended. Thus, the hydraulic cement slurry in the present invention refers to a mixture of one or more of the base material, aggregate, and additives, mixed with appropriate water. The subfloor of the structure to be constructed in the present invention is the so-called foundation of the structure,
For example, poured concrete, PC concrete,
New or existing materials such as ALC lightweight concrete, cement mortar, wood wool cement board, and wood chip cement board can be used as examples. In the present invention, the equipment used to stir and mix the slurry to homogenize it may be of any shape or structure as long as it can stir and mix the slurry to homogenize it.・
As long as the effect is achieved, it is desirable from the viewpoint of economy, workability, etc. to use a structure that is as simple and easy to use as possible. Examples of such equipment include, for example, those shown in Figures 1 to 4, in which many rod-shaped protrusions are attached to the conventional plastering dragonfly or trowel, and those with side branch protrusions attached to the bar-shaped protrusions. Examples include those having similar shapes. Below, some of these devices will be explained with reference to the drawings. Figure 1 A is a plastering iron with a number of rod-shaped protrusions attached at right angles to the substrate. As for metal,
Plastic, rubber, wood, bamboo, etc. are used. If the length of the rod-like protrusion is too short, the base of the iron will come into contact with the slurry during work, worsening work efficiency, so the length of the rod is usually at least twice the thickness of the slurry, preferably at least twice as long. do. The tip of the rod should be rounded to allow for smooth stirring operations.If the rod is too thin, it will not have sufficient strength, and if it is too thick, it will unnecessarily disturb the slurry, so the diameter of the rod is usually around 1 to 5 mm. Make it. If the distance between the bar-like protrusions is too narrow, the slurry will move too much during work, and if it is too wide, the slurry will not be stirred and mixed sufficiently.
Usually 2-10cm. The rods can be attached in any way you like, such as randomly, in an array, or in a staggered manner, on the substrate, but usually arranging them in 1 to 5 rows on the substrate in a staggered manner provides the best stirring efficiency. If the number of rows exceeds 5, the workability will deteriorate. B in Fig. 1 is a rod-shaped protrusion in A with side branch protrusions attached, and it is expected that the stirring effect will be better than in the case of using A. FIG. 1C is an example in which a mesh plate is used in place of the substrate in A. Figures 2 to 2 are examples of a case where a rod-shaped protrusion is applied to a plasterer's dragonfly, and Figure 3, e is an example of a case where a mesh-like rotating frame is attached instead of the rod-like protrusion. . In addition, the holes in Fig. 3 are made by attaching bar-shaped protrusions at intervals of 2 to 5 cm along the diameter at the bottom of a wooden or metal disk, ring-shaped frame, etc., or by attaching plate-shaped protrusions instead of bars. This is an example of a case where many objects are attached. Furthermore, ``way'' in FIG. 4 are examples of similar shapes such as garden cleaning rakes and agricultural rakes. In addition, in the above-mentioned dragonfly-shaped or trowel-shaped device to which a rod-shaped projection or a rod-shaped projection with a side branch is attached, a plate-shaped projection with a width of 0.5 to 10 cm and the same height as the projection is used instead of these projections. You can also attach multiple things. At this time, it goes without saying that the intervals between the plate-shaped protrusions, their arrangement, etc. should be set to be suitable for stirring and mixing the slurry. Next, to explain how to use these devices, a film usually forms on the surface of the slurry within a relatively short period of time after construction. After the slurry is formed, find a suitable time while the slurry is still in a fluid state and hold the dragonfly or trowel so that each rod-like protrusion or plate-like protrusion is perpendicular to the slurry surface. The slurry is moved in a straight line or in a circular motion over the entire area of the slurry. When using a dragonfly with a reticulated rotating frame attached, the rotating frame is rolled and moved in the slurry all over the construction surface in the same manner as above. Furthermore, when a device such as a disk or ring-shaped frame with a rod-shaped protrusion or a plate-like protrusion attached is used, the same process as above is performed while rotating the disk etc. with an appropriate power. Note that, if necessary, the dragonfly, trowel, etc. mentioned above can be towed by power, or can be towed while applying power vibrations. By performing such treatment on the hydraulic cement slurry described above that is poured onto the subfloor, the slurry is stirred and mixed to be homogenized. In carrying out the present invention, such treatment can be repeated not only once but as many times as long as the slurry retains its fluidity. Also, depending on the type of slurry used,
After the treatment, a film may be formed on the slurry surface again, so in such a case, the treatment may be repeated until no surface film is formed. Furthermore, in the present invention, even when the viscosity of the slurry increases, the slurry can be sprinkled with water and the process can be repeated, if necessary. Next, to explain the effects of the present invention, according to the present invention, a floor surface with high level accuracy can be formed much more easily and in a shorter time than in the past, as is clear from the examples described later. . In other words, as mentioned above, the conventional method is to pour hydraulic cement slurry onto the subfloor and then level the surface of the newly formed slurry layer using a plasterer's trowel or dragonfly to obtain a horizontally smooth surface. However, such methods require highly skilled plastering techniques and long hours of work, and often do not yield satisfactory results; however, according to the present invention, no plastering techniques are required. Moreover, a finished surface with a higher level of precision than before can be obtained with simple equipment and a short time. In addition, in conventional construction methods, after a while after slurry is poured onto the subfloor, air bubbles are generated in the slurry, which can cause pinholes and craters to form on the floor surface when the slurry hardens. However, according to the present invention, such troubles are not observed, and the present invention is an advantageous method in this respect as well. Next, the present invention will be explained in more detail with reference to Examples. Example () Preparation of slurry for cast flooring materials α-hemihydrate gypsum, β-hemihydrate gypsum, type anhydrite, ordinary Portland cement, blast furnace cement, flyash cement, and blast furnace cement, each alone or in a specific two-type mixture Prepare a predetermined amount of base material consisting of sea sand, sea sand and
Add a specified amount of river sand or silica sand, and add Melment (trade name, melamine formalin condensate manufactured by Showa Denko Co., Ltd.) and Mighty as additives.
FD (product name, naphthalene sulfonate, manufactured by Kao Soap Co., Ltd.), Work 500 (product name, manufactured by Nippon Zeon Co., Ltd.) [dispersant], carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), polyvinyl alcohol (PVA) ), Kelzan (trade name, polymer polysaccharide manufactured by Kaneda Yuka Co., Ltd.) Methylcellulose (MC)
[Thickeners listed above], Pufftard (product name, Ajinomoto Co., Inc. product), peptone, sodium citrate,
K ₂ CO ₄ , Na ₂ SO ₄ , Ca(OH) ₂ [Condensation regulators]
A predetermined amount of water was added to a mixture prepared by adding a predetermined amount of the following, and the mixture was kneaded for 5 minutes to prepare slurries for various flooring materials. (Refer to Table 1 for the composition and physical properties of each slurry.) () Casting Each slurry obtained in () was coated with an adhesive commonly used in this type of construction (acrylic ester copolymer emulsion). ), dried and primed 10 square meters (2
A slurry pump (discharge rate 5 /
minutes). At that time, the thickness of the slurry was varied in the range of 5, 10, and 15 mm depending on the type of slurry. Next, in order to improve the level accuracy of the newly formed floor surface immediately after construction, 30 minutes later, and 60 minutes later, stirring and mixing treatment according to the method of the present invention was performed, and as a comparative example, a conventional method was used. The surface of each sample slurry was leveled using a plasterer's mark, a trowel, etc., and after the slurry had hardened in each case, JASSST-604 (Test method for flatness of concrete finish) was applied.
The level accuracy was determined by measuring the flatness of the newly formed floor surface at 60 points on all construction surfaces using the method according to the following. The construction conditions and the results obtained are shown in Table 1. In addition, "none", "trowel", "dragonfly", "present invention 1", "present invention 2" and "present invention 3" in the "treatment method" column of Table 1 refer to the following treatments, respectively. means. "None": No treatment, that is, no treatment was performed to improve the level accuracy of the newly formed floor surface after construction. "Tron" or "Tombo": A conventional plastering trowel or a dragonfly is used to level the surface of the slurry layer (full surface smoothing process), and the trowel used at this time is made of iron with a length of 15 cm and a width of 4 cm. things,
The dragonfly was made of wood and was 30cm long and 5cm wide. "Invention 1", "Invention 2" and "Invention 3";
Invention 1 is a trowel-like device (15 cm long and 4 cm wide) that is mounted on a rectangular wooden board with a length of 50 cm as shown in Fig. 1A.
This is a processing method in which stirring and mixing is carried out in one reciprocating operation from side to side, over the entire area of the slurry layer described above, using iron bar-shaped protrusions 3 mm thick and arranged in a staggered manner at 3 cm intervals. The present invention 2 is a process in which the above-mentioned equipment is used to stir and mix the entire area of the poured slurry layer by moving the equipment thoroughly in a circular motion horizontally to the construction surface. is a dragonfly-shaped device shown in Figure 2 D (a rectangular wooden board measuring 30 cm long and 10 cm wide, with iron bar-like protrusions 50 mm long and 3 mm thick arranged in a staggered manner at 4 cm intervals).
This refers to a process in which stirring and mixing is performed in one traction operation over the entire area of the poured slurry layer. Note that the numerical values in the "Level Accuracy" column in Table 1 indicate that the larger the value of the denominator is, the smaller the value is, and the better the level accuracy is.

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[Table] As is clear from the description in Table 1, when the method of the present invention was applied to the slurry after pouring and the level accuracy was improved, new formations were formed that were larger in width than with the conventional method. Not only is the level accuracy of the floor surface improved, but the time required for processing can also be significantly shortened compared to conventional methods.

[Brief explanation of the drawing]

In each drawing of FIGS. 1 to 4, the figures indicated by the symbols I to Y each represent slurry stirring and mixing equipment preferably used in the present invention.

Claims (1)

[Claims] 1 In the self-leveling construction method in which a slurry of hydraulic cement is poured onto the subfloor of a structure to form a smooth floor surface, after the slurry is poured onto the subfloor, while the slurry is still in a fluid state, A self-leveling method characterized by stirring and mixing slurry to homogenize it.