JPH05214795A - Bed regulating method - Google Patents

Abstract

PURPOSE:To use an inexpensive fiber sheet excellent in adhesion with mortar and suitable for being embedded in the mortar layer as a reinforcing material, provide a bed regulating method suitably applicable to the use of the fiber sheet, and prevent the peel of a surface finishing material. CONSTITUTION:A mortar 8 is applied to the surface of a concrete skeleton 7. Before the mortar layer 8 is hardened, a porous fiber sheet 11 is pressed by a roller 9 and embedded in the mortar layer 8. At this time, the flowing mortar 8 flows into the fiber sheet 11 and further the surface of the fiber sheet 1 to form projections of mortar. The surface of the fiber sheet 11 is rubbed with a trowel, whereby the projections of mortar are smoothed. The bristles of fibers 2 forming the fiber sheet 11 are exposed onto the smoothed surface. Thereafter, by using this as a bed, tiles 10 are stuck thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preparing a surface for finishing a concrete skeleton, and more particularly to a method of preparing a surface using a fiber sheet such as carbon fiber or aramid fiber.

[0002]

2. Description of the Related Art Generally, a fiber reinforced resin sheet (hereinafter FR
P sheet is abbreviated as “P sheet”, and long fibers of a fiber material having high strength and high elasticity such as carbon fiber and aramid fiber are arranged in one direction with directionality aligned, and a curable resin such as epoxy resin The sheet material impregnated with the agent is laminated, and the long fiber and the sheet material are integrated by curing the resin agent.
Therefore, the FRP sheet manufactured in this way has a mechanical directionality according to the orientation direction of the fibers.
That is, it becomes strong against the longitudinal force in which the fibers are oriented, but very weak against the transverse force.

Therefore, when manufacturing an FRP sheet that is strong against both longitudinal and lateral forces, the unidirectional FRP sheets are laminated in multiple layers with different directions. I am trying to do it. That is, as shown in, for example, Japanese Patent Publication No. 56-54207, when a unidirectional reinforcing fiber is impregnated with a curable resin agent to prepare a plate-shaped FRP sheet having a desired thickness by a prepreg, The fibers are laminated with their orientations crossed to correct the difference in heat shrinkage due to the fiber orientation and warpage due to this, and are cured integrally according to the required thickness with strength in each direction to a predetermined thickness. FRP
Attempts have been made to make sheets and use them by embedding them in concrete or mortar.

[0004]

By the way, in recent years, FRP having high tensile strength, light weight, and excellent corrosion resistance.
Is used as a reinforcing material in concrete-based materials and other building materials, and the composite material is often used in building structures to reduce the weight of the skeleton, improve durability, and save construction work. The tendency is increasing.

However, the conventional FR as described above
Since the molding surface of the P sheet is made smooth by the resin, it has the disadvantage of poor adhesion to concrete-based materials such as mortar and other building materials, and it is difficult to ensure its integrity as a composite material. There was a problem.

Further, in the conventional FRP sheet, it is necessary to laminate a number of long fiber layers in which the orientations of the fibers are aligned in the same direction, and to make the orientations different in various directions.
There is also a problem that manufacturing is troublesome and cost is high to use as a building material.

Also, as one of the above-mentioned technical trends,
When finishing the surface of a concrete skeleton with finishing mortar or with a tile or the like through pasting mortar, the idea is to replace the non-woven fabric or other reinforcing material embedded in the mortar with a stronger FRP sheet. However, as described above, it is difficult to secure the integrity with the mortar with the conventional FRP sheet, so if this is embedded as a reinforcing material in the mortar layer for finishing the surface of the concrete skeleton, temperature change and When a differential movement caused by an earthquake motion or the like occurs, the tile as a finishing material or the mortar itself may be exfoliated.

The present invention has been made in view of the above circumstances, and an object thereof is to have excellent adhesiveness to concrete-based materials such as mortar and other building materials, and thus to be integrated as a composite material. In particular, when finishing the surface of the concrete skeleton with finishing mortar or with tiles or the like through pasting mortar, it is suitable for embedding as a reinforcing material in the mortar layer and is inexpensive. It is an object of the present invention to provide a base adjustment method which uses a fibrous sheet and can be preferably applied in using the fibrous sheet and can prevent the surface finish material from peeling off.

[0009]

Means for Solving the Problems In order to achieve the above-mentioned object, a method of preparing a groundwork of the present invention comprises applying mortar to the surface of a concrete skeleton, and before the mortar is cured, carbon fibers or aramid constituting a sheet. 3 fibers such as fibers
A fiber sheet having a large number of holes entwined in the dimension direction and bound to each other and penetrating the sheet surface is pressed against the mortar to form protrusions of the mortar on the surface of the fiber sheet. The surface of the fiber sheet is rubbed to expose the hairs of the fiber of the fiber sheet on the surface of the fiber sheet while smoothing the protrusions.

In addition, before or at the same time as smoothing the projections, mortar is further applied onto the fiber sheet to smooth the projections.

A roller is provided on the surface of the fiber sheet,
The present invention is characterized in that the fiber sheet and the mortar are brought into close contact with each other by pressing them with a pressing plate or the like, and then the protrusions formed on the surface of the fiber sheet are smoothed with a trowel or the like.

Further, the mortar is a polymer cement containing a polymer, cement and aggregate.

Furthermore, the fiber sheet has a thickness of 1 mm.
It is characterized by being the following non-woven fabric.

As the fiber sheet, carbon fiber sheet, aramid fiber sheet and the like can be preferably used.

Further, the fiber sheet is specifically obtained by dispersing short fibers in a liquid containing a resin as a binder, heating the paper to dry it, and binding the fibers to each other with a resin. Various sheets can be used, such as a sheet having a papermaking structure, or a sheet obtained by impregnating a felt with a resin as a binder, or a sheet obtained by compressing with a pressure roller and heating and drying while impregnating the resin. When using a fiber sheet containing heat fusion fibers,
The sheets may be heated so that the fibers are bound together by thermal fusion. Any of these fiber sheets has air permeability.

The thickness of the fiber sheet is preferably 0.3 mm or more and 1 mm or less. A fiber sheet having a thickness of less than 0.3 mm is not preferable because it is difficult to fluff each fiber constituting the fiber sheet. On the other hand, if it exceeds 1 mm, the thickness of the mortar to be applied at the time of finishing becomes unnecessarily thick and it becomes difficult to integrate the mortar and the fiber sheet, which is not preferable.

The fibrous sheet may be a woven fabric as long as fluffing can be secured, but since the woven fabric is generally made of long fibers, fluffing of the fibers is difficult and expensive.
The fiber sheet used in the present invention is preferably a non-woven fabric.

Although the thin fiber sheet is sometimes called paper, the present invention also includes such paper.

The binding between the fiber materials constituting the fiber sheet is carried out by thermosetting resin such as phenol, epoxy (thermosetting), polypropylene (PP), polyphenyl sulfide (PPS), epoxy (thermosoftening). , Acrylonitrile butylene styrene (ABS) or other heat-softening resin, pitch, or the like.

In particular, the fiber sheet applied to the present invention must have holes penetrating the sheet.
The through hole preferably has a diameter of 1 to 4 mm. Diameter 1
This is because if the thickness is less than mm, it is difficult for the mortar to flow out from the holes, and if it exceeds 4 mm, the shear strength becomes low particularly in the case of tile finishing.

The pitch of the holes is preferably 5 to 15 mm from the viewpoint of ensuring the shear strength in tile finishing. The most preferred embodiment is a fiber sheet in which holes having a diameter of about 1.5 mm are perforated at a pitch of about 10 mm.

[0022]

The fiber sheet used in the present invention generally has
A large number of short fibers are entwined in a three-dimensional direction and are bound to each other with a resin or the like, and the ends of the short fibers are erected on the surface so that they can be fluffed. Therefore, when the fiber sheet is used in the method of the present invention, the surface of the fiber sheet is kept fluffed, or the surface of the fiber sheet is rubbed with a trowel to increase the fluffiness, and when it is combined with a building material, This fluff acts as an anchor and the fiber sheet mechanically adheres to the building material,
Adhesion between them is improved and they become firmly integrated.

The fiber sheet used in the present invention is
Since it has many holes penetrating the sheet surface, when the fiber sheet is embedded in mortar, not only the fluff on the surface functions as an anchor and mechanically adheres to the mortar, but the mortar also has holes in the fiber sheet. The mortar flows into the part and solidifies to be intertwined with each other, and more particularly, the mortar flows out to the surface of the fiber sheet through the holes to form mortar protrusions on the surface of the fiber sheet.

Mortar was applied in order to positively make the protrusions and in order to eliminate air existing between the mortar and the fiber sheet and to improve the adhesion between the mortar and the fiber sheet. After that, it is preferable that the fiber sheet is placed on the mortar before the mortar is cured and the surface of the fiber sheet is pressed toward the mortar layer with a roller, a pressing plate or the like.

Thereafter, the mortar projections are smoothed with a trowel or the like, with or without applying mortar on the fiber sheet on which the mortar projections are formed. When the fluidity of the mortar is good, the pore size is large, or the number of pores is large, it is possible to omit applying the mortar onto the fiber sheet. In particular, when a roller having a large number of needles on the surface is used and mortar having a good fluidity is used, the pressing work and the smoothing work can be performed at the same time by including the mortar in this roller.

Since the protrusion of mortar has a height of about 1 to 3 mm, the surface of the fiber sheet is inevitably rubbed when it is smoothed with a trowel or the like, and the ends of the fibers of the fiber sheet are separated from the surface of the mortar layer. Exposed to ensure fiber fluff. Due to the exposure of the fibers, the adhesion with the finishing mortar applied thereon is increased. At this time, if the thickness of the mortar on the fiber sheet is excessively thick, the fibers are not exposed on the mortar, so when applying a finishing material on this,
The adhesion between the finish and the mortar on the fiber sheet no longer increases. Therefore, a suitable mortar thickness on the fiber sheet is 0.5-5 mm, preferably 1-3 mm. However, if the mortar smoothed on the fiber sheet is also used as the finishing mortar and the construction is completed by coating on this, the thickness of the mortar on the fiber sheet may be thick. This is because the fibers have entered the finishing mortar.

When a surface finish is applied after the surface conditioning method according to the present invention is applied, mortar is applied, and when mortar is applied on a fiber sheet, the applied mortar is left for about 1 week after application, and it will occur in the future. After the occurrence of cracks, it is preferable to finish with a finishing mortar, or to finish with a tile through a sticking mortar.

At this time, due to the presence of fibers in the fiber sheet, adhesion between the mortar and the applied mortar and the finishing mortar when used, or between the mortar and the applied mortar and the applied mortar and tile. The strength can be increased. Particularly, according to the present invention, since the mortar is made to protrude from the holes of the fiber sheet and then smoothed, the adhesive strength between the mortar and the applied mortar and the finishing mortar, the applied mortar and the tile is increased, and therefore the out-of-plane is obtained. The peel strength can be increased.

[0029]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a manufacturing process of a fiber sheet applied to the present invention. As shown in the figure, this fibrous sheet 1 is oriented by randomly entwining short fibers 2 of a carbon fiber or aramid fiber, which is a fiber material having high strength, high elasticity, and excellent corrosion resistance and fire resistance, in a three-dimensional direction. Then, the long felt-like fibrous body 3 formed to have a constant width dimension H and a predetermined thickness D is further processed. In the felt-like fiber body 3, an epoxy resin is previously applied as an uncured resin to the surface of each of the short fibers 2 constituting the felt-like fiber body 3 by dipping or the like, and the felt-like fiber body 3 is formed as a prepreg mat. ing. Further, this felt-like fiber body 3 has a large void between each short fiber 2 and has a so-called sponge shape, and can be compressed to an arbitrary thickness by applying pressure.

The epoxy resin applied to the surface of the short fibers 2 is a thermosetting resin and solidifies in a state where the short fibers 2 are integrated with each other.

The above-mentioned felt-like fibrous body 3 is continuously supplied to a press roller pair 4 which pressurizes while rotating, and is cold-pressed by the press roller pair 4 so that the respective short fibers 2 are separated from each other. It is bound by an epoxy resin and molded into a single fiber sheet 1. The thickness d of the formed fiber sheet 1 is approximately equal to the spacing between the press roller pair 4, and the width dimension is maintained at the original width dimension H. The thickness of the fiber sheet 1 is preferably 0.3 mm or more and 1 mm or less. A fiber sheet having a thickness of less than 0.3 mm is not preferable because it is difficult to fluff each fiber constituting the fiber sheet. On the other hand, if it exceeds 1 mm, the thickness of the mortar to be applied at the time of finishing becomes unnecessarily large and it becomes difficult to integrate the mortar and the fiber sheet, which is not preferable.

In this fibrous sheet 1, the short fibers 2 are entangled with each other in a state of having voids according to the compression ratio in the thickness direction, and in this state, they are integrally bound by solidification of the epoxy resin. Such a long fiber sheet 1 is continuously formed. Further, by sequentially cutting the above-mentioned long fiber sheet 1 to a predetermined size, the fiber sheet 1 having a uniform length, width, and length can be obtained.

Therefore, in the fibrous sheet 1 obtained as described above, the short fibers 2 are three-dimensionally oriented and entangled, and are integrated with the resin in a state of being compressed in the thickness direction. The strength in the orthogonal thickness direction can be sufficiently secured, and the strength is high in the three-dimensional direction without delamination.

Further, since the felt-like fibrous body 3 of the fibrous sheet 1 is formed by entwining a large number of short fibers 2 in the three-dimensional direction, the surface of the fibrous sheet 1 has the short fibers 2.
The end of is raised and can be fluffed. For this reason, when the fiber sheet 1 is bonded to a building material such as a plate material to be composited as a laminated board, or embedded in a building material such as a concrete material or a gypsum board to be composited, the surface thereof is obtained. Since the fluffs of the fibers function as anchors for the building material and are mechanically fixed, the adhesion between the fiber sheet 1 and the building material is improved and the fibers are firmly integrated.

The fibrous sheet 1 described above may be a woven fabric as long as fluffing can be secured, but since the woven fabric is generally made of long fibers, fluffing of the fibers is difficult and expensive. The fiber sheet 1 used in the example is preferably a non-woven fabric. Although a thin fiber sheet is sometimes referred to as paper, the fiber sheet in this specification includes such paper.

The compression ratio D / d during molding is
It can be appropriately set in consideration of the thickness of the fiber sheet 1 to be obtained and the required strength in the thickness direction.

FIG. 2 shows a fiber sheet 11 applied to the present invention.
FIG. 3 is a diagram showing the process itself, and FIG. Here, this fiber sheet 11 is obtained by further processing the above-mentioned fiber sheet 1. That is, in the manufacturing process shown in FIG. 1B, when the felt-like fiber body 3 is press-formed into a sheet shape,
As shown in FIG. 3, a large number of slits 5 are formed in a zigzag pattern on the sheet surface, and thereafter, by pulling the fiber sheet 11 in a width direction orthogonal to the slits 5, as shown in FIG. A large number of holes 6 penetrating the sheet surface of the sheet 11 are arranged in a mesh pattern. The fiber sheet 11 having such a configuration is embedded in the mortar layer when adjusting the foundation of the concrete skeleton, and is particularly suitable for use as a reinforcing material.

The holes penetrating the seat surface preferably have a diameter of 1 to 4 mm. This is because if the diameter is less than 1 mm, it is difficult for mortar to flow out from the holes, and if it exceeds 4 mm, the shear strength becomes low particularly in the case of tile finishing. The pitch of the holes is 5 from the viewpoint of ensuring the shear strength in tile finishing.
-15 mm is preferred. The most preferred embodiment is a fiber sheet in which holes having a diameter of about 1.5 mm are perforated at a pitch of about 10 mm.

The base adjusting method according to the present invention to which the above fiber sheet 11 is applied will be described below with reference to FIG. 4 (A) to 4 (C) are cross-sectional views showing an example of construction when the surface of the concrete skeleton 7 is tiled, in the order of work steps. As shown in FIG.
First, mortar 8 is applied to the surface of concrete skeleton 7 to form a mortar layer. As the mortar 8 to be applied, for example, polymer, cement, polymer cement containing aggregate, or the like is preferable. At this time, in order to improve the adhesion, it is preferable to apply the primer on the surface of the concrete skeleton 7 and then apply the mortar 8. Then, before the mortar layer 8 is cured, the mortar layer 8 shown in FIG.
As shown in (B), the fiber sheet 11 is pressed and embedded by the roller 9 or the like. At this time, the fluid mortar 8 flows into the fiber sheet 11 and further to the surface of the fiber sheet 11 to form mortar protrusions described later. Then, by rubbing the surface of the fiber sheet 11 with a trowel or the like,
The protrusions of this mortar are smoothed. The bristles of the fibers 2 forming the fiber sheet 11 are exposed on the smoothed surface. After that, the tile 10 is pasted with this as a base, as shown in FIG.

The formation of the protrusions of the mortar 8 and the construction associated therewith will be described in more detail with reference to FIGS.

Since the fiber sheet 11 has a large number of holes 6 penetrating its sheet surface, when the fiber sheet 11 is embedded in the mortar 8, the fluff on the surface functions as an anchor and the mortar 8 and the mechanical surface. Mortar 8 enters into the holes 6 of the fiber sheet 11 and solidifies to become entangled with each other.
The mortar 8 flows out to the surface of the fiber sheet 11 through the holes 6 to form the protrusions 20 of the mortar 8 on the surface of the fiber sheet 11 (see FIG. 5A). Here, in the fiber sheet 11, as a whole, a large number of short fibers 2 are bound together by a resin or the like while being entwined in a three-dimensional direction, and the surface of the fiber sheet 11 is fluffed by the ends of the short fibers 2 standing up. Therefore, the fiber sheet 11 has increased fluffing while the surface of the fiber sheet 11 is kept fluffed or the surface of the fiber sheet 11 is rubbed with a trowel to smooth the protrusions 20. When composited with this, the fluff functions as an anchor, and the fiber sheet 11 is mechanically fixed to the building material, and their mutual adhesiveness is improved so that they are firmly integrated.

By the way, in order to positively form the protrusions 20 and in addition, the mortar 8 and the fiber sheet 11 are brought into close contact with each other to eliminate air existing between them, and thus the mortar 8 is removed.
In order to improve the adhesion between the fiber sheets 11 and each other, after applying the mortar 8, the fiber sheet 11 is placed on the mortar 8 before the mortar 8 is cured, and the surface of the fiber sheet 11 is applied to the mortar layer 8. It is preferable to press it toward the roller 9 or a pressing plate.

Thereafter, the mortar protrusion 20 is smoothed with a trowel or the like, with or without further addition of mortar on the fiber sheet 11 on which the mortar protrusion 20 is formed (see FIG. 5B). When the fluidity of the mortar 8 is good, the pore diameter is large, or the number of pores is large, it is possible to omit applying the mortar onto the fiber sheet 11. Especially when using a roller with a large number of needles on the surface and using a mortar with good fluidity,
By including mortar in this roller, the pressing work and the smoothing work can be performed at the same time.

Since the protrusion 20 of the mortar has a height of about 1 to 3 mm, the surface of the fiber sheet 11 is inevitably rubbed when it is smoothed with a trowel or the like, and the end of the fiber 2 of the fiber sheet 11 is mortar. Exposed from the surface of the layer 8 ensures the fluffing of the fibers 2. Due to the exposure of the fibers 2, the adhesive force with the finishing mortar 21 applied thereon is increased (see FIG. 5C). At this time, if the thickness of the mortar 8 on the fiber sheet 11 is excessively thick, the fibers 2 are not exposed on the mortar 8. Therefore, when a finishing material such as the finishing mortar 21 or the tile 10 is applied on this, the finishing material The adhesive force between the mortar 8 on the fiber sheet 11 and the mortar 8 on the fiber sheet 11 does not increase. Therefore, the thickness of the mortar on the fiber sheet 11 is 0.5 to 5 mm, preferably 1 to 3 mm. However, when the mortar 8 smoothed on the fiber sheet 11 is also used as the finishing mortar and the construction is completed by coating on this, the thickness of the mortar 8 on the fiber sheet 11 is It may be thick. This is because the fibers 2 have entered the mortar 8 that is the finish.

In the case where the surface finishing is carried out after the base adjustment method according to the present invention is applied, as shown in FIGS. 5C and 5D, the mortar 8 and the fiber sheet 11 are provided with mortar. The applied mortar is left for about 1 week after application, and cracks are generated in the future, after which it is finished with finishing mortar 21 or applied mortar 22
It is preferable to perform tile finishing through the.

At this time, due to the presence of the fibers 2 of the fiber sheet 11, between the mortar 8 and the applied mortar and the finishing mortar 21 when used, or between the mortar 8 and the applied mortar and pasted mortar 22 when used. The adhesive strength with the tile 10 can be increased. In particular, according to the invention, the mortar 8 is filled with holes 6 in the fiber sheet 11.
Since the mortar 8 and the applied mortar and the finishing mortar 21, the sticking mortar 22 and the tile 10 are increased in strength after being projected from the surface, the out-of-plane peel strength can be increased.

As is clear from the above description, the fiber sheet 11 embedded in the mortar layer 8 and interposed between the concrete frame 7 and the tiles 10 and the like serves as a strong reinforcing material. Then, this makes it possible to relieve the stress caused by the generation of the differential movement, and the exposure of the fibers 2 constituting the fiber sheet 11 from the mortar 8 also functions as an anchor for the tile 10 and the like. Therefore, it is extremely effective in preventing the tile 10 and the finishing mortar 21 from peeling off.

Further, the fiber sheet 1 applied to this embodiment
Since No. 1 does not cause rust due to corrosion, it has excellent durability and also has good fire resistance.

Since the fiber sheet 11 does not require the work of stacking layers in which long fibers are aligned in one direction and oriented in different layers, which is different from conventional ones, the fiber sheet 11 is much easier to manufacture than the conventional one. Therefore, the manufacturing cost becomes low. Furthermore, since the short fibers 2 are used as the fiber-based material, it is advantageous in terms of material cost as compared with the conventional example using long fibers.

The holes 6 provided on the sheet surface of the fiber sheet 11 are not limited to those shown in FIG. 2, and for example, as shown in FIGS. 6 (A) to 6 (C), holes having an appropriate shape can be formed by punching. You may make it provide many 6. Even in this case, it goes without saying that the same effects as those of the above-described embodiment can be obtained.

<Experimental Example> The effect of the present invention will be clarified further by an experimental example.

Portland cement: 1 part by weight, SBR
Water was added to 0.1 part by weight of a mixed polymer of EVA and EVA and 1 part by weight of sand, and the mixture was kneaded with a hand mixer to obtain a mortar. Put this mortar on the concrete surface with a trowel 2-3 mm
Was applied.

A carbon fiber sheet having a papermaking structure and a size of 1 mm × 1 m with a thickness of 0.6 mm (fibers are bonded to each other by an epoxy resin. Fiber thickness is about 13 μm, and hole pitch is shown in Table 1. Table 5), the hole spacing from the adjacent row is 5 mm, and the others are shown in Table 1) were pressed onto the coated mortar with a tension roller. By this pressing, in the case of a perforated fiber sheet, mortar flowed out from the holes, and mortar projections were formed on the fiber sheet. A small amount of mortar was applied and the protrusions were smoothed with a trowel. When smoothing with a trowel, the surface of the carbon fiber sheet is inevitably rubbed.

After being left for one week, a tile of 45 mm × 95 mm × 8 mm was attached through a mortar for tile application (cement: 1 part by weight, sand: 1.8 parts by weight, methyl cellulose: 0.08 parts by weight).

After standing for 4 weeks, shear strength (in-plane strength) and peel strength (out-of-plane strength) were measured in order to examine the adhesive strength of the tile. The measurement results are shown in Table 1.

Shear strength was measured by pushing the tile parallel to the plane. The peel strength was measured by attaching a jig to the surface of the tile with an adhesive and pulling the tile in a direction perpendicular to the surface.

[0057]

[0058]

In summary, in the present invention, since the fiber sheet having a large number of holes penetrating the sheet surface is used, it is interposed between the mortar coated on the surface of the concrete skeleton and the fiber sheet. Air can be easily eliminated to enhance the adhesive effect between the mortar and the fiber sheet,
Further, this fiber sheet is pressed against the mortar applied to the concrete skeleton side, thereby forming protrusions of mortar on the surface of the perforated fiber sheet, aiming at integration of the fiber sheet and mortar, and then the surface of the fiber sheet. The fibers are exposed on the surface of the fiber sheet while smoothing the protrusions by rubbing the edges of the fiber sheet so that the ends of these fibers can be raised and fluffed. It is possible to improve the adhesiveness by being adhered to the surface of the concrete, and when the surface is finished with a finishing material such as tiles, the fibrous sheet is embedded as a strong reinforcing material to form the groundwork on the concrete skeleton side, and the groundwork is adjusted. As a result, the stress caused by the occurrence of the differential movement can be relaxed, and Te, fiber sheet, since not occur such as occurrence of rust corrosion I be a 俟 also phase having also good fire resistance is excellent in durability, and extremely effective to spalling prevention of finish.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a manufacturing process of a fiber sheet applied to the present invention.

FIG. 2 is a perspective view showing an example of a fiber sheet applied to the present invention.

FIG. 3 is a diagram showing an intermediate process of manufacturing the fiber sheet shown in FIG.

FIG. 4 is a diagram illustrating an example of construction when the surface of a concrete skeleton is tiled.

FIG. 5 is a diagram showing an example of formation of mortar protrusions and accompanying construction in the base adjustment method according to the present invention.

FIG. 6 is a diagram showing a modified example of the fiber sheet.

[Explanation of symbols]

 1,11 Fiber sheet 2 Fiber 6 Hole 7 Concrete skeleton 8 Mortar 9 Roller 10 Tile 20 Protrusion

Front page continuation (72) Inventor Noriyuki Furuya 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (72) Inventor Yasuhiko Kunihara 4-640 Shimoseido, Kiyose-shi Tokyo Metropolitan Research Institute Inc.

Claims (5)

[Claims] 1. A mortar is applied to the surface of a concrete skeleton, and while the mortar does not harden, the fibers such as carbon fibers and aramid fibers constituting the sheet are entangled in a three-dimensional direction and bound to each other and the sheet. A fiber sheet having a large number of holes penetrating a surface is pressed against the mortar to form protrusions of the mortar on the surface of the fiber sheet, and the surface of the fiber sheet is rubbed to smooth the protrusions. A base adjusting method for finishing the surface of a concrete skeleton, characterized in that the hairs of the fibers of the fiber sheet are exposed on the surface of the fiber sheet. 2. The undercoat adjusting method according to claim 1, wherein mortar is further applied onto the fiber sheet before or at the same time as smoothing the projections so as to smooth the projections. 3. The surface of the fiber sheet is pressed by a roller, a pressing plate or the like to bring the fiber sheet into close contact with the mortar, and then the protrusions formed on the surface of the fiber sheet with a trowel or the like are used. The base adjustment method according to claim 1, wherein the base adjustment method comprises smoothing. 4. The mortar comprises polymer, cement,
The groundwork adjusting method according to any one of claims 1 to 3, which is a polymer cement containing aggregate. 5. The method of preparing a groundwork according to claim 1, wherein the fibrous sheet is a non-woven fabric having a thickness of 1 mm or less.