JPH0830381B2 - Construction method for undercoating on buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is a plasterer whose main material is cement, lime, gypsum, polymer cement mortar, etc., which is strong and hard to peel off in the building frame in repair work of a building. The present invention relates to a method of applying a base coat to a building for forming a base coat of a coating material for a base.

<Conventional technology> Conventionally, as a base coating construction method for a building to form a coating layer of a coating material mainly composed of mortar, lime, gypsum, polymer cement mortar, etc. on the surface of the building frame, A synthetic resin emulsion is applied to the surface of the body as an adhesion enhancer or is mixed with a coating material to enhance the adhesion between the surface of the body and the coating layer.

In rare cases, apply permeable synthetic resin to the skeleton to strengthen the skeleton surface, use the coating material as the coating base, and apply the middle coating or top coating,
Or it is a general construction method that finishes such as painting, spraying, and tiling are applied.

<Problems to be Solved by the Invention> However, there are the following various problems in the coating base prepared by the conventional method. That is, in the repair work, poor adhesion between the skeleton and the base mortar,
Alternatively, if mortar is applied to a base that is a fragile surface such as lightweight foam concrete (ALC plate), or a base that is significantly weakened due to salt damage, chemical damage, deterioration, or neutralization, etc. Accidents such as shrinkage, vibration of building frame, deformation, expansion and contraction, cracks and peeling due to asymmetry between the base and finish.

The synthetic resin emulsion penetrates the surface of the building structure from the surface, and the synthetic resin emulsion does not have a large penetration depth, and when the layer to be strengthened is not effective, the effect is not exerted and it is strengthened according to the drying shrinkage of the coating material. Cracks and peeling occur between the permeated part and the fragile non-penetrated part.

In other repair work, paint, oil, or other substances that are harmful to the adhesion of the coating material adhere to the surface of the coating, and if removal is insufficient, even if the corner coating is applied, peeling will occur in a short time.

Therefore, in order to reduce the above problems as much as possible, careful work such as removing fragile portions and hard-to-attach base surfaces and expensive coating materials are required, resulting in high cost.

<Means for Solving Problems> An explanation will be given with reference to the drawings. The base coating construction method for a building according to the present invention is applied to a building for forming a coating layer of a plastering coating material mainly composed of mortar, lime, gypsum, polymer cement mortar or the like on the surface of the building body. In the undercoating application method, the polymer cement mortar 4 is applied to the coated surface of the building frame 2, and then the synthetic fiber net 8 is applied to the surface of the polymer cement mortar 4 in an undried state by a trowel.
The net 8 is embedded by moving the trowel smoothly along the surface while replenishing the polymer cement. After the polymer cement mortar 4 is dried, the tack 6 is driven into the polymer cement mortar 4 and the net embedded polymer cement is tacked by the tack head 6b. Mortar 4
And a second polymer cement mortar 7 is applied to the outside of the net-embedded polymer cement mortar 4 and the tack head 6b, and a polymer cement mortar coating layer is applied to the building body. Is to join.

<Embodiment> A first embodiment will be described with reference to FIGS. 1 to 9. In FIG. 1, 2 is a skeleton.

First step: As shown in FIG. 2, a polymer cement mortar 4 is applied on the surface of the skeleton 2 in a thickness of 3 to 5 mm.

Second step: In the undried state of the polymer cement mortar 4, the synthetic fiber net 8 is stretched on the surface of the polymer cement mortar 4 and the trowel is smoothly moved along the surface while the polymer cement mortar 4 is replenished by the iron, as shown in FIG. A net 8 is embedded near the surface of the polymer cement mortar 4.

Third step: As shown in FIG. 4, the skeleton 2 is penetrated through the polymer cement mortar 4 in a dry state in which the net 8 is embedded.
Drill a hole 10 with a drill 11.

Fourth step ... As shown in FIG. 5, chips 2b and 4b in the hole 10 are removed by air from the air nozzle 13.

Fifth step: The polymer cement mortar 4a is applied to the leg portion 6a of the tack 6 shown in FIG. 9 as shown in FIG. 6, and then it is driven by the hammer 12, and as shown in FIG.
Then, the net 8 embedded polymer cement mortar 4 is pressed toward the skeleton 2.

Step 6 ... As shown in FIG. 8, a second polymer cement mortar 7 is further applied to the outside of the net 8 embedded polymer cement mortar 4 and the tack head 6b. In this case, the second
The second net 8 may be embedded near the surface of the second polymer cement mortar 7 by sticking the net 9 and pushing the net 9 with the trowel while smoothly moving the trowel along the surface.

A second embodiment will be described with reference to FIGS. 9 to 11.

6 is a tack, 5 is a hollow pipe made of the same material, 2 is a building frame, 4 is polymer cement mortar, and 8 is a synthetic fiber net. As the material of the tack 6, it is preferable to use a synthetic resin such as stainless steel or polypropylene having a strength that does not easily corrode.

The embodiment shown in FIG. 10 is convenient when the construction is performed by a small number of people or when the surface of the skeleton 2 is uneven. A pipe 10 shown in FIG. 11 which is hollow in advance and has a spiral groove therein is bored in a building body 2 by drilling a hole 10. The length of the pipe 5 is between 2.5 and 8 cm. Next, the body 2 is coated with the polymer cement mortar 4, a synthetic fiber net 8 is attached before the coated polymer cement mortar 4 dries, and the trowel is smoothly moved along the surface while supplementing the polymer cement mortar with the trowel. A net 8 is embedded near the surface of the polymer cement mortar 4. Polymer cement mortar
4a is attached to the leg 6a of the tack 6, and the tack 6 is fitted to the pipe 5. If necessary, in the vicinity of the outer side of the head 6b of the tack 6 the second
The net 9 may be set up. After the polymer cement mortar 4 is hardened, the second polymer cement mortar 7 is applied and surface-conditioned to form an undercoat.

A third embodiment will be described with reference to FIGS. 9, 12, and 13.

Reference numeral 1 denotes a separator head piece that remains in the recess 3 of the building frame 2 after removing the cone at the end of the separator when the plywood form is disassembled after the concrete is cast. 5 is a pipe fitted in the separator head piece 1,
It has small undulations (not shown) on the inner and outer surfaces. 4 is recess 3
It is a polymer cement mortar filled inside. 6 is a tack inserted into the pipe 5 from the side opposite to the separator head piece 1, and 7 is a polymer cement mortar applied to the surface of the building frame 2. Reference numeral 8 is a synthetic fiber net embedded in the polymer cement mortar 7 by the means described in the description of FIG. 3 above, and 9 is a second synthetic fiber net covering the tack head 6b.

Explaining the construction method, first, a coating material such as caulking agent or polymer cement slag that has high fluidity and does not corrode the iron portion is applied to the inside of the pipe 5, fitted into the separator head piece 1, and the recess 3 is formed. The polymer cement mortar 4 is filled, and the pipe 5 is bonded and fixed to the building frame 2. Subsequently, the surface of the building frame 2 is coated with a polymer cement mortar 4 having a thickness of 3 to 5 mm, the net 8 is embedded in the polymer cement mortar by the means described in the explanation of FIG. 3 above, and the tack 6 is caulking agent. Or, after applying polymer cement slag, drive the stud legs 6a into the pipe 5 and press the stud head 6b so that a circle or rectangular second net 9 with a diameter of 10 to 30 cm is stretched, and then the second net 9 is laid on it. Apply the second polymer cement mortar 7. As described above, since the second polymer cement mortar 7 which is the coating layer of the coating base is joined to the building frame 2, the building frame 2
A strong coating base is formed even if the vibration of the body 2 or the surface layer of the body 2 is slightly weak.

A fourth embodiment of the present invention will be described with reference to FIGS. 14 and 15. In the tack 6 of this embodiment, the portion corresponding to the leg of the solid tack used in the third embodiment of FIGS. 12 and 13 is replaced by the pipe-shaped leg 6a, and the head 6b and the pipe are integrated. It has a simplified structure. Explaining the construction method, the concave portion 3 is filled with a solid polymer cement mortar 4, and before it is dried, the surface of the building body 2 is coated with the polymer cement mortar, and the means described in the explanation of FIG. Thus, the net 8 is embedded, the pipe-shaped leg 6a is fitted to the separator head piece 1, and the building frame 2 and the polymer cement mortar 7 in which the net 8 is embedded are joined and fixed. In this case, the tack shown in FIG. 9 can be further pushed and used together.

The first embodiment shown in FIGS. 1 to 8, FIGS. 10 and 11
The second embodiment shown in the drawing, the third embodiment shown in FIGS. 12 and 13 and the fourth embodiment shown in FIGS. 14 and 15 are often mixed and carried out at the construction site. The point is that either one may be adopted depending on the staffing and the condition of the groundwork.

Incidentally, as is well known, in the repair work of a building, it goes without saying that the construction method may slightly change depending on the deterioration condition of the groundwork and the finishing use.

<Effects of the Invention> The method for applying a base coating on a building according to the invention described above is superior to conventional methods in the following points.

Even an unskilled plasterer can easily apply a solid and reliable undercoat by short-term learning.

Construction is easy and the construction period is shortened with only lightweight drills, tacks and synthetic fiber nets.

It is possible to reduce the required amount of adhesive and binder such as synthetic resin.

Therefore, the burden of site management including safety is reduced.

The synthetic fiber net is flexible and easy to handle, and has excellent durability when embedded in a polymer cement mortar. In addition, 4 layers of polymer cement mortar embedded with synthetic fiber net form one strong plate-like object, which is pressed against the skeleton 2 by the rivet head 6b and is joined to the skeleton, which is partially unsatisfactory. Even if there is such a portion, since it is in the form of one strong plate, the dried polymer cement mortar does not partly peel off and become brittle.

[Brief description of drawings]

1 to 9 show a first embodiment of the present invention,
Fig. 1 is a side view of the body to be repaired, which is cut vertically, and Fig. 2 is the first.
The vertical cutting side view showing the process, FIG. 3 is the vertical cutting side view showing the second process, FIG. 4 is the vertical cutting side view showing the third process, and FIG. 5 is the vertical cutting side view showing the fourth process. 6 and 7 are vertical sectional side views showing the fifth step, and FIG. 8 is a vertical sectional side view showing the sixth step. FIG. 9 is a perspective view of a tack. FIGS. 10 and 11 show a second embodiment of the present invention, and FIG. 10 is a vertical cut side view of the second embodiment.
The figure is an external view and a partial cross-sectional view of the pipe. Fig. 12 and
FIG. 13 shows a third embodiment of the present invention. FIG. 12 is a sectional view showing a construction situation of the third embodiment of the present invention, and FIG. 13 is a sectional view of a pipe. 14 and 15 show the fourth of the present invention.
Fig. 14 shows an example, and Fig. 14 is a sectional view showing the construction situation.
FIG. 15 is a rear perspective view of the tack. 1 …… Separator head piece 2 …… Body 2b …… Chips 4,4a …… Polymer cement mortar 4b …… Chips 5 …… Pipes 6 …… Sticks 6a …… Legs 6b …… Head 7 …… Second Polymer cement mortar 8 …… Net 9 …… Second net 10 …… Hole 11 …… Drill 12 …… Hammer 13 …… Air nozzle

Claims (1)

[Claims] 1. A method of undercoating a building for forming a coating layer of plastering material on the surface of a building frame,
Applying the polymer cement mortar on the coated surface of the building body, and then applying a synthetic fiber net to the surface of the polymer cement mortar in its undried state, and smoothly moving the iron along the surface while supplementing the polymer cement mortar with the iron. Embedding a net, driving a tack into the polymer cement mortar after drying the polymer cement mortar, suppressing the outer surface of the net-embedded polymer cement mortar with a tack head, and finally the net-embedded polymer cement mortar and A method for applying an undercoat to a building, which comprises applying a polymer cement mortar coating layer to a building body by a process including applying a second polymer cement mortar to the outside of a tack head.