JPH0781383B2 - Mortar construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying mortar (painting material) such as cement mortar or resin mortar onto a concrete ground surface such as a building or a civil engineering structure.

[0002]

BACKGROUND OF THE INVENTION Conventionally, the following methods [A] to [D] have been proposed as a method of applying cement mortar or resin mortar on a concrete base surface. [A] Mortar construction method The first step is to treat the concrete surface. That is, if the concrete surface is deteriorated, the deteriorated part is scraped off, and if dirt or dust is attached, it is washed and removed, and the adhesive force between the concrete surface and the mortar to be coated is improved. In order to improve the surface treatment, a base treatment is performed.

As the second step, a primer is applied.
That is, a primer is applied with a brush or a roller in order to enhance the adhesion between the concrete base surface and the mortar.
As the primer, polyacrylic acid ester,
A resin emulsion such as ethylene butadiene rubber or polyvinyl acetate diluted 3 to 4 times with water, or an epoxy resin or a urethane resin is generally used.

As a third step, the kneaded mortar is applied. That is, cement mortar or resin mortar kneaded under a predetermined mixing condition is applied to a concrete base surface with a predetermined thickness by using a metal trowel or the like.
In this mortar application method [A], application work is easy and the application efficiency is excellent, but the applied mortar is liable to float or peel off. That is, although the concrete base surface and the applied mortar adhere via the primer, it is difficult to obtain a reliable and reliable adhesion property. In particular, when the concrete ground surface to which the mortar is applied is deteriorated and becomes fragile, the concrete ground surface is dirty with dust or dust, or the concrete ground surface is oily or lubricated,
The non-adhesive force between the concrete ground surface and the mortar is not sufficient, and the mortar is likely to float or peel off after the construction.

As the first step of the mortar construction method [B], as in the case described above, the concrete surface is treated. As the second stage, as in the case above,
Apply primer. As the third step, the kneaded mortar is applied to a position where a steel mesh or the like is embedded. That is, a cement mortar or a resin mortar kneaded under a predetermined mixing condition is applied to a position where a steel mesh or the like is embedded with a metal iron.

As a fourth step, a net material is arranged. That is, a net material such as a fiber mesh made of fibers such as steel mesh, metal lath, wire lath, carbon fiber, GRC fiber and vinylon fiber is arranged on the mortar surface applied in the third step. As a fifth step, mortar is applied to finish.

In this mortar construction method [B], the drying shrinkage of the mortar can be reduced by the net material inside the mortar,
Floating and peeling can be reduced, and even if cracks occur,
Although it is possible to suppress floating and peeling, floating and peeling of the applied mortar easily occur. That is, since the adhesive force of mortar is nothing but the adhesive force between the mortar and the concrete surface, it is difficult to obtain a reliable and reliable adhesive property as described in the case of [A] above. Is. In particular, peeling is likely to occur when the concrete base surface is fragile or oily.

[C] Method of applying mortar As the first step, the concrete surface is treated as in the case described above. As the second step, a hole is made in the concrete surface with a drill or the like. As the third step, a primer is applied as in the above case. In the fourth step, a net material such as a steel mesh or a metal lath is fixed with a fixing anchor at a predetermined distance from the base surface. That is,
Insert the fixing anchor into the hole drilled on the concrete surface and fix it. As the fixing method, a method of enlarging the tip part where the driving method or the tightening method is used to fix the fixed anchor, a method of pouring epoxy resin or cement mortar into the hole, and a cartridge type adhesive,
A method of applying an impact to this cartridge to react and fix the adhesive can be mentioned. The connection between the fixed anchor and the steel mesh may be performed by welding or by bolting to the screw of the head of the fixed anchor.

As a fifth step, the mortar which has been kneaded and mixed is poured into the mortar, and the mortar is painted and finished with a gold iron. This [C] mortar construction method can reduce the occurrence of cracks in the mortar,
It can prevent floating and peeling. In other words, the occurrence of mortar cracking is significantly reduced by embedding and integrating steel mesh etc. in the mortar,
Even if the adhesive force between the lower ground and the mortar is reduced, since the mortar is fixed via the fixing anchor, floating and peeling can be effectively prevented.

However, since the mortar is poured from above the steel mesh, the adhesive force between the base surface and the mortar is small. That is, when directly applying the mortar to the base surface with a metal trowel, no void can be formed between the base surface and the mortar, and high adhesion can be obtained, but when the mortar is poured from the upper part of the steel mesh, Since it is applied from the top of the steel mesh, voids are likely to be formed, and it is difficult to expect high adhesive force. Especially, when mortar is kneaded, voids are easily formed and it is difficult to expect high adhesive force.

Further, it is not easy to dispose the net material so as to float above the concrete base surface. That is, first, the fixing anchor and the net surface can be started only after the fixing anchor and the base surface have been cured and integrated, so that a rapid hardening material that cures extremely quickly is used. If the fixed anchor is not used to fix it to the base surface, it requires a curing period, which is troublesome. Also, when fixing with a space between the net material and the concrete base surface, it is necessary for a person to ride on the net material to perform the work. However, there is a problem that the installation work is extremely difficult and the construction efficiency is extremely low.

Furthermore, it is necessary to use a material having a high rigidity that does not deform even if a person rides on it, and the material of the mesh material is limited, and for example, a carbon fiber mesh, a GRC fiber mesh, or a fiber mesh having a low rigidity can be used. Absent. [D] Mortar construction method Fix a steel mesh, metal lath, etc. to the concrete ground surface and apply mortar (fix the concrete ground surface and the steel mesh in contact). This construction method is the same as the above-mentioned [C] mortar construction method, except that the steel mesh is fixed in contact with the concrete base surface.

In this mortar construction method [D], the work of attaching the steel mesh is easy, but since the mortar is poured from the upper portion of the steel mesh and applied, the adhesion between the concrete ground surface and the mortar is small, and Since the steel mesh is arranged in contact with the concrete base surface, the bottom of the steel mesh cannot be filled with mortar, and voids are likely to occur. Therefore, in addition to not being able to obtain high adhesive strength, water vapor that has permeated from the bottom of the concrete accumulates in the voids, rusting steel mesh, etc. However, the durability is poor.

Further, since the position of the steel mesh is in contact with the concrete base surface, the integration of the steel mesh and the mortar is not sufficient, the effect of preventing cracking due to drying shrinkage of the mortar is small, and the mortar floats or peels off. The prevention effect is small.

[0015]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a mortar construction method in which the foundation surface and the mortar are highly integrated, the mortar layer has high durability, and the workability is excellent. An object of the present invention is a mortar construction method in which a mortar layer having a thickness of (A + B) is provided on a base surface , including (1) a first step of forming a hole in the base surface, and (2) A second step of inserting the temporary pins, and (3) after the second step, a mol having a thickness of about A is formed on the base surface.
The third step of applying tal, and (4) the thickness of the mortar is about A
A fourth step of arranging so that there is no gap between them, and (5) after removing the temporary pin, insert the fixed anchor into the hole.
And a fifth step of fixing the net material, and (6) after the fifth step, a mol having a thickness of about B is formed on the net material.
And a sixth step of applying tar .

The present invention will be described more specifically. In the repair (repair) construction work of concrete members such as buildings and civil engineering structures, the first step is to treat the concrete ground surface. This is done in the same way as described in the previous section. The second step is to make a hole in the ground concrete. That is, a hole for fixing the fixing anchor is made in the base concrete with a concrete drill or the like. It should be noted that the diameter of the hole is not particularly limited as long as it can be fixed by inserting a fixing anchor, but is usually 5 to 10 mm.
It only needs to be high. Further, the interval (density) between the holes is appropriately determined depending on the conditions of use, the type of mortar to be applied, and the like.

As a third step, the temporary pin is inserted into the hole. The provisional pin is inserted so that the mortar does not flow into the hole when the mortar is applied, and the position of the hole is known when the mortar is applied. The temporary pins may be rigid, but those formed of an elastic body such as rubber are suitable for applying a primer or applying mortar.

In the fourth step, a resin emulsion of polyacrylic acid ester, ethylene butadiene rubber, polyvinyl acetate, etc. is diluted 3 to 4 times with water,
Apply a primer made of epoxy resin or urethane resin with a brush or roller. The primer application work may be carried out immediately after the first stage base treatment. In the fifth step, the mixed cement mortar and resin mortar are applied with a thickness of approximately A by means of a metal trowel or the like.

As a sixth step, a net material composed of steel mesh, metal lath, wire lath, carbon fiber, GRC fiber, vinylon fiber, etc. is placed on the mortar having a thickness of about A. In this case, if there is a gap between the applied mortar and the net material, it is advisable to lightly press it with a metal trowel or the like. As a seventh step, the net material and the base concrete are fixed using a fixed anchor. That is, the temporary pin inserted in the third step is removed, and the fixing anchor is inserted and fixed in the hole. Fixing can be performed by filling the hole with an adhesive such as cement mortar or epoxy resin and inserting a fixed anchor, whereby the net material is fixed to the base concrete through the anchor. The structure of the fixed anchor may be any structure as long as the net material such as steel mesh can be pressed and can be integrated with the adhesive material filled in the hole. For example, there are T-shaped members and "shaped members.

In the eighth step, mortar is applied on the fixed net material to a predetermined thickness. Applying this mortar, even immediately after fixing the net material with a fixed anchor,
It does not matter even after the under-kneaded mortar has hardened to such an extent that it is not deformed even when a person rides on it. The mortar construction method according to the present invention has the following features. (1) Not only is the adhesion between the base surface and the mortar excellent, but because the net material and the base are connected and fixed via a fixing anchor, a reliable adhesion force is obtained, and the mortar floats or peels off. Can be reliably suppressed.

(2) Since the net material is embedded in the mortar, the occurrence of cracks due to the drying shrinkage of the mortar can be reduced. (3) When the net material is fixed by providing a space between the base surface and the net material, and then the mortar is applied, the mortar application force of the metal iron is well transferred to the mortar below the net material. However, a void is generated between the base surface and the mortar, and high adhesive force cannot be expected. However, in the present invention, a void is not generated between the base surface and the mortar, and high adhesive force can be expected.

(4) Since voids are not easily formed between the base and the mortar layer and in the mortar layer itself, vapor permeated from the base concrete is rarely accumulated, and rusting of the reinforcing bars and deterioration of the adhesive force are extremely small. (5) Easy construction and good workability. (6) There are few restrictions on the net material. That is, a mesh having a low rigidity such as a carbon fiber mesh or a GRC fiber mesh can be used.

[0023]

1 to 4 are process drawings showing an embodiment of a mortar construction method according to the present invention. First, as shown in FIG. 1, the surface of the base concrete 1 is ground and pretreated, and at the same time, the holes 2 are formed in the base concrete 1 with a concrete drill, and then the temporary pins 3 are inserted into the holes 2.

After this, a resin emulsion of polyacrylic acid ester, ethylene butadiene rubber, polyvinyl acetate or the like diluted 3 to 4 times with water, or a primer made of epoxy resin or urethane resin is applied. next,
As shown in FIG. 2, a mortar 4 such as kneaded cement mortar or resin mortar is applied with a thickness of about A using a metal iron.

After this, as shown in FIG. 3, a net material 5 such as a carbon fiber mesh is placed on the mortar 4.
In this case, it is lightly pressed by a metal trowel or the like so that no gap is formed between the applied mortar 4 and the net material 5. afterwards,
The temporary pin 3 is pulled out, the fixed anchor 6 is inserted into the vacant hole 2, and the fixed anchor 6 is fixed to the foundation concrete 1. The fixed anchor 6 can be fixed by filling the hole 2 with an adhesive such as cement mortar or epoxy resin. Then, as shown in FIG. 4, a mortar 7 having a thickness B is applied on the fixed mesh material 5 using a metal iron.

[0026]

[Effect] According to the mortar construction method of the present invention, the foundation and the mortar are highly integrated, the mortar layer is highly durable, and the workability is excellent.

[Brief description of drawings]

FIG. 1 is a first process diagram of a mortar construction method according to the present invention.

FIG. 2 is a second process diagram of the mortar construction method according to the present invention.

FIG. 3 is a third step diagram of the mortar construction method according to the present invention.

FIG. 4 is a fourth step diagram of the mortar construction method according to the present invention.

[Explanation of symbols]

 1 Foundation concrete 2 Hole 3 Temporary pin 4 Mortar 5 Netting material 6 Fixed anchor 7 Mortar

Claims (1)

[Claims] 1. A mortar construction method in which a mortar layer having a thickness of (A + B) is provided on the lower ground surface, which is (1) a first step of making a hole in a base surface, and (2) a temporary pin in the hole. And (3) after the second step, a mol having a thickness of about A is formed on the base surface.
A third step of applying tal, and (4) a net material on the mortar having a thickness of approximately A
A fourth step of arranging so that there is no gap between them, and (5) after removing the temporary pin, insert the fixed anchor into the hole.
And a fifth step of fixing the net material, and (6) after the fifth step, a mol having a thickness of about B is formed on the net material.
And a sixth step of applying tar .