JP2020125663A - Surface layer part removal method - Google Patents

Abstract

To provide a surface layer part removal method capable of removing a finishing material such as a tile fixed to a surface of a concrete member in the state that an occurrence of noise or vibration is inhibited easily.SOLUTION: The surface layer part removal method for removing a tile 31 adhered to a surface of a floor slab 2 via a mortar 32 comprises a drilling process of forming an injection hole 4 extending from a surface of the tile 31 to a boundary surface of the floor slab 2 and the mortar 32, an injection process of injecting a release agent 5 consisting of an acidic solution of pH 3-5 from the injection hole 4 to the boundary surface and a removal process of removing the tile 31 and the mortar 32 from the floor slab 2.SELECTED DRAWING: Figure 2

Description

The present invention relates to a surface layer removing method.

When remodeling a house, existing finishing materials such as tiles and floor materials (surface layer) that cover the surface of the floor or wall may be removed. As a method of removing such a finishing material, a method of scraping off the finishing material and an adhesive material such as mortar using a tool such as a breaker or a chipper is known.

However, since a breaker, a chipper, etc. are a method of crushing an object (finishing material, mortar, etc.) by striking it, large noise and vibration are generated, and dust and the like are scattered around. Therefore, if the finishing material is removed using a tool in a housing complex that is in service, a residential area, or the like, there is a risk that the neighboring residents will be affected.

Therefore, in Patent Document 1, as a method of removing low vibration and low noise, a groove or a hole is formed so as to surround the periphery of the removal target range, and a load applying hole is formed in the removal target range. A method of peeling off a surface layer portion from a concrete member by applying a load in a peeling direction to a removal target range using a load applying hole is disclosed.

Further, in Patent Document 2, as a method of peeling off only tiles without generating dusty noise and without scattering dust, a concrete member in which tiles are adhered via mortar or the like is used. A method of stripping tiles from the surface of a concrete member by moving a horizontal cutter along the surface is disclosed.

JP, 2010-216160, A JP2012-007463A

In the removal method of Patent Document 1, since a tensile force is applied and the object is peeled off without hitting the object, noise and vibration are small, but it is not easy to peel off the surface layer portion in close contact with the concrete member. Moreover, although the removal method of Patent Document 2 enables noise and the like to be suppressed by cutting using a horizontal cutter, it can cut only a range within which the blade of the horizontal cutter can reach, and thus a wide range of construction work is possible. Not suitable for. Further, when the surface layer portion (joint portion) is removed for the purpose of repairing a deteriorated concrete structure, there is a similar problem.

From such a viewpoint, the present invention makes it possible to easily remove the surface layer portion fixed to the surface of a concrete member such as a floor slab or a structural wall over a wide range while suppressing the generation of noise and vibration. The object is to propose a method for removing the surface layer portion.

In order to solve the above problems, the present invention is a surface layer for removing a surface layer portion fixed by splicing cementitious material such as a leveling material or a base mortar for tiles on the surface of a concrete member such as a floor slab or a structural wall. Part removal method, a hole making step of forming an injection hole from the surface of the surface layer portion to the boundary surface between the concrete member and the surface layer portion, and peeling from the injection hole made of an acidic solution to the interface surface An injection step of injecting the agent and a removal step of removing the surface layer portion from the concrete member are provided.

According to such a surface layer removing method, the cement material is dissolved by the acid of the release agent at the interface with the concrete member by the release material injected from the injection hole formed in the injection step, and the adhesive force at the interface is lowered. In this state, the surface layer portion is peeled off, so that noise and vibration are unlikely to occur. Therefore, the surface layer portion can be removed from the surface of the concrete member with the influence on the neighborhood being minimized. That is, at the interface between the concrete member and the surface layer portion, the alkali component in the cement hydrate (concrete, mortar, etc.) and the acidic solution injected through the injection hole are dissolved by the neutralization reaction, so It becomes easy to peel off the part.

If a liquid containing an organic carboxylic acid and a thickener is used as the release agent, it becomes possible to spread the release material in a plane by press-fitting at a predetermined pressure, and the release material is kept constant. It is possible to prevent it from flowing only to the route (water channel). Further, the release agent preferably has a pH of 3 to 5, and more preferably a pH of 3 to 3.5.

Further, in the removing step, after the anchor is installed on the surface layer portion, the anchor layer may be pulled up by a chain block or the like to separate the surface layer portion from the boundary surface.
Further, in the removing step, the surface layer portion may be cut by a cutter to be divided into a plurality of pieces. At this time, a tool such as a burl may be inserted into the groove formed by cutting with a cutter to peel off the surface layer portion.

According to the surface layer removing method of the present invention, it is possible to easily remove the surface layer fixed to the surface of the concrete member while suppressing the generation of sound and vibration.

It is a perspective view showing a part of floor structure concerning an embodiment of the present invention. It is a perspective view which shows the drilling process of the surface layer removal method which concerns on embodiment of this invention. It is sectional drawing which shows the injection process which concerns on embodiment of this invention. It is sectional drawing which shows the condition which installs an anchor in the removal process which concerns on embodiment of this invention. It is sectional drawing which shows the condition which removes a surface layer part by an anchor in the removal process which concerns on embodiment of this invention. It is a perspective view which shows the condition which removes a surface layer part by a burl in the removal process which concerns on embodiment of this invention.

In the present embodiment, as a bathroom remodeling, a surface layer removing method for removing an existing tile 31 (surface layer 3) will be described. In the bathroom floor 1, as shown in FIG. 1, the surface (upper surface) of a concrete floor slab (concrete member) 2 is covered with a plurality of tiles 31 as finishing materials. A mortar 32 is provided as an adhesive layer between the floor slab 2 and the tile 31. That is, the surface layer portion 3 of the floor 1 is composed of a mortar 32 which is a cement-based material spliced onto the surface of the floor slab 2 which is a concrete member, and a plurality of tiles 31 which cover the surface of the mortar 32. When the tile 31 is removed, the mortar 32 is also removed at the same time to expose the surface of the floor slab 2.

The surface layer removing method includes a hole making step, an injecting step, and a removing step.
As shown in FIG. 2, the drilling step is a step of forming an injection hole 4 extending from the surface of the tile 31 to the boundary surface (the surface of the floor slab 2) between the floor slab 2 and the adhesive layer (mortar 32). .. It is desirable that a plurality of injection holes 4 be formed at a predetermined interval. The injection hole 4 is preferably formed so as to penetrate the tile 31, but may be formed in the joint 33 between the tiles 31. The inner diameter of the injection hole 4 is not limited, but is within the range of 5 mm to 20 mm. Further, the number and arrangement of the injection holes 4 are not limited, and the release material injected through the injection holes 4 is arranged so as to entirely spread over the entire interface. The drilling means for forming the injection hole 4 is not limited, and for example, a low vibration drill, a hammer drill, an electric drill, a core drill, or the like may be used. After the drilling step, it is desirable to remove the cutting chips generated by the drilling of the injection hole 4 from the inside and outside of the injection hole 4.

As shown in FIG. 3, the injection step is a step of injecting the stripping agent 5 made of an acidic solution from the injection hole 4 to the boundary surface between the floor slab 2 and the mortar 32 (surface layer portion 3). The stripping agent 5 is press-fitted at a predetermined pressure using the injection pump P. The type of the injection pump P for press-fitting the release agent 5 is not limited, and, for example, a foot-operated type, a manual type, or an electric type may be used.

The stripping agent 5 is an acidic solution having a pH of 3 to 5, more preferably a pH of 3 to 3.5, and uses a mixture of an organic carboxylic acid and a thickener. The type of organic carboxylic acid is not limited, and for example, a monovalent or divalent or higher valent organic carboxylic acid such as citric acid, gluconic acid, acetic acid or malic acid is used. The degree of saturation of the organic carboxylic acid is in the range of 40 to 100%, preferably 80 to 90%, of the solubility in water. For example, since citric acid has a solubility in water of 73 g/100 g, when it is used as the stripping agent of the present invention, a solution in which about 58 to 66 g is dissolved in 100 g of water may be used. As the thickener, for example, a thickener for a general aqueous solution such as methylcellulose, xanthan gum, or pectin may be used. In addition, the material and composition of the stripping agent 5 are not limited as long as they are acidic solutions containing an acidic solution and a thickener as main components and may contain other adjusting liquids such as water. Not something.

The release agent 5 is prepared so that the viscosity is in the range of about 50 mPa·s to about 2000 mPa·s (viscosity of salad oil to about condensed milk), but preferably in the range of 500±100 mPa·s. desirable. Although the viscosity of the stripping agent 5 is not limited, if the viscosity of the stripping agent 5 is less than 50 mPa·s, the stripping agent 5 injected from the injection hole 4 flows only through a certain route by spontaneous flow. , If you don't go all over On the other hand, when the viscosity of the release agent 5 exceeds 2000 mPa·s, the viscosity is too high and it becomes difficult to press-fit from the injection hole 4.

When the release agent 5 is injected from the injection hole 4, the alkali component (Ca(OH) ₂ ) in the cement hydrate of the concrete of the floor slab 2 and the mortar 32 of the adhesive layer and the organic main carboxylic acid in the release agent 5 are removed. Undergoes an acid-base neutralization reaction, the joint portion at the interface between the floor slab 2 and the mortar 32 is dissolved, and the floor slab 2 and the mortar 32 are separated. The release agent 5 is injected into all the injection holes 4 so that the floor slab 2 and the mortar 32 are entirely separated. The release agent 5 may be injected into a plurality of injection holes 4 at the same time, but the injection holes 4 may be sequentially injected from the hole at the end closest to the wall surface to the adjacent injection hole 4. It is desirable to go.

The removal step is a step of removing the surface layer portion 3 from the floor slab 2. As shown in FIG. 4, in the removing step, first, the tile 31 and the mortar 32 are cut (by forming the groove 6) by a cutter to divide the floor surface into a plurality of pieces. Next, the anchor 7 is inserted into one injection hole 4 and the anchor 7 is fixed (locked) to the surface layer portion 3 (mortar 32). Then, as shown in FIG. 5, the anchors 7 are lifted up by a lifting device such as a chain block or the like to peel off the tiles 31 and the mortar 32 from the floor slab 2. When a part of the tile 31 and the mortar 32 is peeled off from the floor surface, as shown in FIG. 6, by utilizing the concave portion 8 formed by removing the tile 31 and the mortar 32, the surrounding tiles 31 and the mortar 32 are used. To remove. That is, a tool T having a flat tip such as a bar is inserted from the recess 8 into the interface between the floor slab 2 and the mortar 32, and the tool T is peeled off using the lever principle. At this time, since the floor slab 2 and the mortar 32 are separated by the release agent 5, they can be peeled off with a relatively small force. By repeating the same operation, the tile 31 and the mortar 32 can be removed to expose the entire surface of the floor slab 2.

The method of peeling off the tile 31 and the mortar 32 is not limited. For example, after cutting the tile 31 and the mortar 32 with a cutter to form the groove 6, a tool T such as a bar is inserted into the groove 6. You may peel it off with. Further, the entire surface layer portion 3 may be removed by repeating the lifting and peeling work by the anchor 7. Alternatively, the anchor 7 may be fixed by using an anchor hole formed separately from the injection hole 4. Further, the surface layer portion 3 does not necessarily have to be divided in advance. The tile 31 and the mortar 32 may be peeled off by pushing up using a jack device or the like connected to the anchor 7.

According to the surface layer removing method of the present embodiment, since the mortar 32 is separated by dissolving the cement hydrate at the interface between the floor slab 2 and the mortar 32 with the release material, the generation of noise and vibration is minimized. You can keep it to the limit. That is, since noise and vibration are generated only when the injection hole 4 is drilled or when it is cut by a cutter as necessary, noise and vibration are more reduced than in the conventional removal method in which the tile 31 is crushed by a breaker or a chipper. And vibration can be significantly reduced. Therefore, the tile 31 can be removed from the surface of the floor slab 2 while the influence on the neighborhood is minimized.

Further, since the floor slab 2 and the mortar 32 are separated by the release agent 5, the tile 31 can be removed with a small force. Therefore, it can be removed manually, and work can be performed even in a small work space. Moreover, since the tile 31 can be removed only by drilling the injection hole 4 and injecting the release agent 5, the workability is excellent. Therefore, even when the work is performed over a wide range, the work can be completed in a relatively short time. In addition, since the stripping agent 5 is removed together with the removed mortar 32 or is dried in a relatively short time, that is, in about 1 to 2 hours, it does not adversely affect the portion to be left (the floor slab 2). ..

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the respective constituent elements described above can be appropriately modified without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the tile 31 of the bathroom is removed has been described, but the construction site and the object are not limited. For example, the surface layer removing method may be adopted when removing the floor material at the entrance or the like. The finishing material is not limited to the tile 31. Further, the surface layer portion 3 is not limited to the tile 31 and may be concrete or the like spliced to a concrete member. That is, when removing the concrete on the surface side of the cold joint in the repair work of the concrete structure, the surface layer removing method of the present invention may be adopted.

The material forming the adhesive layer is not limited to the mortar 32, and may be, for example, a cement material such as cement paste or a resin material such as so-called joint material.
The surface of the floor slab 2 (concrete member) after the removal of the surface layer portion 3 may be subjected to a surface treatment, if necessary.

1 floor 2 floor slab (concrete member)
31 tiles (surface layer)
32 mortar (surface layer)
33 joints 4 injection holes 5 peeling agent 6 grooves 7 anchors 8 recesses P injection pump T tool

Claims (4)

A surface layer removing method for removing a surface layer fixed by cementing a cement-based material on the surface of a concrete member,
From the surface of the surface layer portion, a drilling step of forming an injection hole reaching the boundary surface between the concrete member and the surface layer portion,
An injection step of injecting a stripping agent made of an acidic solution from the injection hole to the boundary surface;
And a removal step of removing the surface layer from the concrete member. The surface layer removing method according to claim 1, wherein the stripping agent is a liquid containing an organic carboxylic acid and a thickener. The said removal process WHEREIN: After installing an anchor in the said surface layer part, the said surface layer part is peeled off from the said boundary surface by lifting using the said anchor, The surface layer of Claim 1 or Claim 2 characterized by the above-mentioned. Part removal method. The said removal process WHEREIN: The said surface layer part is cut|disconnected by a cutter, and it divides|segments into multiple, The surface layer part removal method of any one of Claim 1 thru|or 3.

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