JP6889980B2 - Joint formation method - Google Patents

Description

The present invention relates to a joint forming method.

If you want to form joints on a cement-based material layer (hereinafter, also referred to as a base material) formed of a cement-based composition such as self-leveling material or mortar, use a solid material (joint type) such as a joint rod in the formwork. The method of attaching and pulling out after curing the base material, the method of pressing the mold when the base material is semi-cured, the method of grooving using a grooving machine (cutter) after the base material is cured, etc. are known (see, for example, Patent Document 1). Has been done. Further, a metal joint rod (for example, brass) is embedded in a base material, and the base material is scraped to expose the joint (joint rod).

Japanese Unexamined Patent Publication No. 2012-184549

In the above method of pulling out the joint bar, it is necessary to make the joint bar into a shape that is easy to pull out, and therefore, the corner portion of the joint of the base material becomes an obtuse angle, and it is not possible to form a sharp (substantially right angle) groove shape. In addition, the corners were easily damaged by applying force when pulling out.

In the method of pressing the mold when the base material is semi-cured, the corners of the joints of the base material become obtuse as described above, it is difficult to determine the timing of embossing, and a strong force must be applied at the time of embossing. , It took a lot of effort to construct.

The method of grooving with a cutter or the like may damage the base layer by the cutter, and it is particularly difficult to apply the method when the base layer is a waterproof layer. In addition, the construction machine was difficult to handle, and it took time and effort to construct a narrow space.

The method of embedding a metal joint bar in the base material and shaving it requires a great deal of labor. Moreover, it could not be applied when it was desired to form the joint in a groove shape.

The present invention has been made in view of such a problem, and a main object thereof is to easily form a joint having a sharp shape.

In order to achieve such an object, the joint forming method of the present invention is used.
The mortar installation process of providing mortar on the base layer and
A joint mold consisting only of a joint embedding material formed of metal and a joint release mold material fixed to the joint embedding material and having water repellency is provided so that the joint release mold material is located above the joint embedding material. The joint type installation process provided on the mortar and
An adjustment step of pressing the joint mold against the mortar to adjust the height of the joint mold, and
A cement composition casting step of placing a self-leveling material as a cement composition on the base layer excluding the joint mold at least to a position higher than the lower surface of the joint release mold material.
After the cement composition is cured, the joint release material removing step of removing the joint release material and the joint release material removal step.
It is characterized by having.
According to such a joint forming method, a joint having a sharp shape can be easily formed.

In such a joint forming method, in the joint mold installation step, the joint mold in which the joint release mold material is fixed on the joint embedding material may be installed on the base layer.

In such a joint forming method, in the joint mold installation step, the joint embedding material may be installed on the base layer, and then the joint release material may be installed on the joint embedding material.

Such a joint forming method may have a water repellency imparting step of imparting water repellency to the joint release type material.
According to such a joint forming method, it is possible to increase the types of materials for the joint release type material.

In such a joint forming method, the water repellency imparting step may be performed before the joint release type material is installed on the joint embedding material.

In such a joint forming method, the water repellency imparting step may be performed after the joint release type material is installed on the joint embedding material.

In such a joint forming method, it is desirable that the water repellency imparting step imparts water repellency to at least a side surface of the joint release mold material.

According to such a joint forming method, the surface of the cement composition can be formed flat.

According to the present invention, a joint having a sharp shape can be easily formed.

It is a figure which shows the state of the implementation of the joint formation method in this embodiment. 2A to 2D are schematic cross-sectional views for explaining the joint forming method of the present embodiment. It is a conceptual diagram for demonstrating the difference in the shape of the joint part between a comparative example and this embodiment.

=== Embodiment ===
<About joint formation method>
Hereinafter, the joint forming method of the present embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a state of implementation of the joint forming method in the present embodiment, and FIGS. 2A to 2D are schematic cross-sectional views for explaining the joint forming method of the present embodiment.

First, a base layer 1 is formed inside the formwork 2 with concrete or the like, and as shown in FIG. 2A, a joint bar 10 (corresponding to a joint mold) is erected on the base layer 1 using a mortar 3 (corresponding to a joint mold). Equivalent to the joint type installation process). The joint bar 10 has a buried layer 11 made of brass (corresponding to a joint buried material) and a thickening layer 12 made of foamed polyethylene (corresponding to a joint release type material), and is thickened with the buried layer 11. The layer 12 is fixed with double-sided tape or the like. The joint bar 10 is placed on the base layer 1 so that the thickening layer 12 is located above the buried layer 11 and the upper surface of the thickening layer 12 is at the finishing level (for example, the upper end of the formwork 2). Press against mortar 3. As described above, in the present embodiment, since the joint bar 10 is erected on the base layer 1 using the mortar 3, the height (upper surface) of the joint bar 10 even when the surface of the base layer 1 is not flat. Can be adjusted to the finishing level. That is, even if the surface of the base layer 1 is uneven as shown in FIG. 2A, the heights of the joint bars 10 can be easily aligned. As described above, in the joint bar 10 of the present embodiment, the buried layer 11 and the thickening layer 12 are fixed in advance, but the present invention is not limited to this, and for example, the buried layer 11 is placed on the base layer 1. After standing in, a thickening layer 12 may be provided on the buried layer 11 to form a joint bar 10.

Next, a water repellent agent is applied to the thickening layer 12 to impart water repellency to at least the side surfaces of the thickening layer 12 (corresponding to the water repellency imparting step). In the present embodiment, a silicon-based water repellent having a contact angle with water of more than 90 degrees is applied to the upper surface and the side surface of the thickening layer 12 using a brush. The water repellent is not limited to silicon-based ones, and other water-repellent agents (for example, fluorine-based water repellents) may be used. Further, in the present embodiment, the joint bar 10 is erected on the base layer 1, and then the water repellent is applied to the thickening layer 12, but the present invention is not limited to this. For example, the thickening layer 12 to which the water repellent agent is applied in advance (water repellency is imparted) is fixed on the buried layer 11 to form the joint bar 10, and the joint bar 10 is used as the base layer 1. It may be erected on top.

After the joint bar 10 is installed, the self-leveling material 20s is placed on the base layer 1 excluding the joint bar 10 to the finishing level position as an example of the cement-based composition (cement composition placing step). As shown in FIG. 2B, the base material 20 (cement-based material layer) is molded.

Here, the self-leveling material 20s is a material that has self-fluidity and can finish a flat and smooth surface without pressing. The self-leveling material 20s preferably has a flow value of 200 to 300 mm, and particularly preferably 200 to 250 mm. The flow value of the self-leveling material 20s means a value measured by the method described in the Architectural Institute of Japan standard JASS15M-103 "Quality standard of self-leveling material". The self-leveling material 20s of the present embodiment is a cement-based self-leveling material, which is cement (Portland cement, alumina cement, Irwin cement, etc.), sand (fly ash, river sand, sea sand, silica sand, limestone, etc.), and water. As the main component, fluidizing agents (naphthalic acid type, melamine sulfonic acid type, polycarboxylic acid type, aminosulfonic acid type, lignin sulfonic acid type, caseins, etc.), sulfates (potassium sulfate, sulfuric acid, etc.) Sodium, aluminum sulfate, etc.), phosphate (condensed phosphate, etc.), thickener (polyacrylic acid, hydroxyethyl cellulose, methyl cellulose, etc.), defoaming agent (silicon-based, nonionic surfactant, etc.), etc. It is a combination. The flow value of the self-leveling material 20s can be adjusted mainly by changing the water content, but the type, properties (for example, sand particle size, shape, etc.) or blending amount of various components other than water, etc. It can also be adjusted by changing. The self-leveling material 20s is generally sold and supplied in a premixed state containing components other than water, and water necessary for obtaining a desired flow value at the time of use is added and blended.

After the self-leveling material 20s is cured (after molding the base material 20), the thickening layer 12 is removed as shown in FIG. 2C. As a result, a sharp groove-shaped joint 22 is formed on the base material 20. In the present embodiment, the depth of the groove of the joint 22 can be easily changed by adjusting the thickness of the thickening layer 12, and the corner portion of the base material 20 is removed when the thickening layer 12 is removed. Can be prevented from being damaged.

Then, as shown in FIG. 2D, the surface of the base material 20 is painted to form the coating layer 30.

FIG. 3 is a conceptual diagram for explaining the difference in the shape of the joint portion between the comparative example and the present embodiment. The left side of FIG. 3 is a comparative example, and the right side is the present embodiment.

Here, as a comparative example, a hydrophilic thickening layer 12'is provided on the buried layer 11. In this case, when the self-leveling material 20s is cast, the surface of the base material 20 around the thickening layer 12'becomes concave as shown in the figure due to surface tension. Therefore, when the thickening layer 12'is removed, the base material 20 around the joint 22 has a raised shape, resulting in poor design.

On the other hand, since the thickening layer 12 of the present embodiment has water repellency, it is difficult to get wet when the self-leveling material 20s is cast, and the surface of the base material 20 tends to be flat. As a result, when the thickening layer 12 is removed, a sharp groove-shaped joint 22 is formed on the flat base material 20 as shown in the figure.

As a method of forming joints on the base material of the cement-based composition, a method of burying a joint rod in a mold and pulling it out after curing, a method of pressing the mold when the base material is semi-cured, a cutter or the like is used. There are known methods such as grooving and shaving by embedding a metal joint bar in the base material, but these methods cannot form sharp joints or damage the corners of the base material. There were also problems such as excessive labor required for construction. On the other hand, in the present embodiment, as described above, a sharp groove-shaped joint can be easily formed.

As described above, in the joint forming method of the present embodiment, the joint bar 10 including the buried layer 11 and the water-repellent thickening layer 12 is provided, and the thickening layer 12 is located above the buried layer 11. As described above, the step of standing on the base layer 1 (joint type installation step) and the self-leveling on the base layer 1 excluding the joint bar 10 up to the position of the finishing level (upper surface of the thickening layer 12). It has a step of placing the material 20s (a step of placing a cement composition) and a step of removing the thickening layer 12 after the self-leveling material 20s is cured (a step of removing the joint release type material). Thereby, in the present embodiment, the base material 20 can be flattened, and the joint 22 having a sharp groove shape can be easily formed.

=== About other embodiments ===
The above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. It goes without saying that the present invention can be modified and improved without departing from the spirit thereof, and the present invention includes an equivalent thereof. In particular, even the embodiments described below are included in the present invention.

In the above-described embodiment, the base layer 1 is a concrete layer, but the present invention is not limited to this. For example, it may be a waterproof layer.

Further, in the above-described embodiment, brass is used as the material of the buried layer 11, but the present invention is not limited to this, and other metals (for example, stainless steel) may be used, or materials other than metal (for example, plastic) may be used. ) May be used.

Further, in the above-described embodiment, foamed polyethylene is used as the material of the thickening layer 12, but the present invention is not limited to this, and other materials may be used. For example, the thickening layer 12 may be formed of a fluororesin material whose material itself has water repellency, and may be fixed on the embedded layer 11 with double-sided tape or the like. In this case, the work of applying the water repellent agent becomes unnecessary, and the construction can be performed more easily. On the other hand, if the water repellent agent is applied as in the above-described embodiment, the material itself does not have to have water repellency, and the types of the material of the thickening layer 12 can be increased.
Further, in the above-described embodiment, the water repellent agent is applied to the upper surface and the side surface of the thickening layer 12, but it is sufficient that at least the side surface has water repellency. That is, it is not necessary to apply a water repellent agent to the upper surface.

Further, in the above-described embodiment, the self-leveling material 20s is used as the material of the base material 20, but the present invention is not limited to this, and other cement-based compositions may be used. For example, mortar may be used. However, in this case, it is necessary to press and level with a trowel or the like after placing the mortar.

Further, in the above-described embodiment, the surface of the base material 20 is painted to form the coating layer 30, but it is not necessary to paint (the coating layer 30 may not be provided). Further, by using a cement-based composition containing a coloring pigment as the material of the base material 20, painting may be omitted.

Further, in the above-described embodiment, the joint bar 10 is fixed on the base layer 1 by the mortar 3, but the present invention is not limited to this. For example, it may be fixed using an adhesive or metal fittings. When the mortar 3 is used, as described above, when the surface of the base layer 1 is not flat, the height of the joint bar 10 (the position of the upper surface of the thickening layer 12) can be easily adjusted.

Further, in the above-described embodiment, the self-leveling material 20s is cast up to the position of the upper surface of the thickening layer 12 in accordance with the finishing level of the upper surface of the thickening layer 12, but the present invention is not limited to this, and at least The self-leveling material 20s may be placed at a position higher than the lower surface of the thickening layer 12. For example, the upper surface of the thickening layer 12 may be made higher than the finishing level (thickness is increased), and the self-leveling material 20s may be cast up to the finishing level. Even in this case, if the side surface of the thickening layer 12 has water repellency, the surface of the base material 20 becomes flat, and when the thickening layer 12 is removed, the groove-shaped joint 22 similar to the above-described embodiment is used. Is formed.

1 Base layer 2 Formwork 3 Mortar 10 Joint bar (joint type)
11 Buried layer (joint burial material)
12 Thickening layer (joint release type material)
20 Base material 22 Joint 20s Self-leveling material 30 Coating layer

Claims (7)

The mortar installation process of providing mortar on the base layer and
A joint mold consisting only of a joint embedding material formed of metal and a joint release mold material fixed to the joint embedding material and having water repellency is provided so that the joint release mold material is located above the joint embedding material. The joint type installation process provided on the mortar and
An adjustment step of pressing the joint mold against the mortar to adjust the height of the joint mold, and
A cement composition casting step of placing a self-leveling material as a cement composition on the base layer excluding the joint mold at least to a position higher than the lower surface of the joint release mold material.
After the cement composition is cured, the joint release material removing step of removing the joint release material and the joint release material removal step.
A joint forming method characterized by having. The joint forming method according to claim 1.
In the joint mold installation step, a joint forming method characterized in that the joint mold in which the joint release mold material is fixed on the joint embedding material is installed on the base layer. The joint forming method according to claim 1.
The joint mold installation step is a method for forming a joint, which comprises installing the joint burying material on the base layer and then installing the joint releasing material on the joint burying material. The joint forming method according to any one of claims 1 to 3.
A joint forming method comprising a water repellency imparting step of imparting water repellency to the joint release type material. The joint forming method according to claim 4.
The joint forming method, characterized in that the water repellency imparting step is performed before the joint release type material is installed on the joint burying material. The joint forming method according to claim 4.
The joint forming method, characterized in that the water repellency imparting step is performed after the joint release type material is installed on the joint burying material. The joint forming method according to any one of claims 4 to 6.
The joint forming method is characterized in that the water repellency imparting step imparts water repellency to at least a side surface of the joint release type material.

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