JP2571177B2 - Corrosion protection method for concrete floor and wall surface, and precast plate with anchor used for this 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 preventing corrosion of a concrete surface and a precast plate with an anchor used in this method.

[0002]

2. Description of the Related Art As a method of preventing corrosion on a concrete surface, there is a method of protecting a concrete surface from being eroded by bonding an anticorrosion sheet or an anticorrosion tile to the concrete surface.

[0003] Although this anticorrosion method is relatively simple and efficient, it has the following problems when it is applied to concrete floors and walls such as sewage treatment tanks and chemical storage tanks.

[0004]

That is, when an anticorrosion sheet is adhered to the concrete surface of a floor or a wall, the concrete surface is rough, so that poor adhesion tends to occur, and concrete tends to crack. Since it is a material, groundwater penetrates through cracked portions of concrete and the like, and accumulates at a poorly bonded portion of the sheet.
Then, the water pressure and vapor pressure of the groundwater cause swelling of the anticorrosion sheet, and sheet peeling progresses, and eventually the anticorrosion sheet is destroyed, the concrete is severely eroded, and the chemicals and sewage leaked from the eroded part and surrounding water are used. There was a problem that soil was contaminated.

[0005] On the other hand, when the anticorrosion tiles are bonded, there is a problem that the work is troublesome due to the small size, and the gap between the tiles is likely to be a weak point.

In addition, since formation of these anticorrosion layers requires a considerable amount of time, there has been a problem that the construction period is prolonged.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a new concrete floor and wall surface which can be easily constructed, does not require a long construction period, and can exhibit an excellent anticorrosion effect over a long period of time. And a novel anchored precast plate used in the anticorrosion method.

[0008]

In order to achieve the above object, a concrete floor anticorrosion method according to the present invention uses a mortar made of a mortar having a synthetic resin anticorrosion sheet fixed to the surface and an anchor projected to the back. The precast plates with anchors are laid on the concrete before the concrete cast for floor formation has not yet hardened, and the concrete is cured with the anchors embedded, preventing corrosion of the adjacent precast plates with anchors. The end portions of the sheet are resin-welded.

In the method for preventing corrosion of a concrete wall according to the present invention, the above-mentioned anchored precast plate is erected to form an inner mold or an outer mold or both molds for forming a concrete wall, and a tension member. The inner and outer molds are connected via a slab, and concrete is poured between the inner and outer molds and the concrete is hardened while the anchors are embedded, and the end portions of the anticorrosion sheets of the adjacent precast plates with anchors are joined together. Is resin-welded.

In the precast plate with an anchor of the present invention used in these anticorrosion methods, a large number of projections dispersed on the back surface of a synthetic resin anticorrosion sheet are embedded in a mortar layer containing a reinforcing material. The anticorrosion sheet is fixed on the surface of the mortar layer, and an anchor is provided on the back surface of the mortar layer.

[0011]

[Function] As in the anticorrosion method for concrete floors of the present invention, precast boards with anchors are laid on uncured concrete, and the concrete is hardened while the anchors on the back of the precast boards are embedded. Since it does not come off and the precast plate is firmly fixed to the concrete floor surface, the troublesome work of bonding an anticorrosion sheet or an anticorrosion tile to the concrete floor surface as in the related art is unnecessary. Therefore, after laying, the anticorrosion layer can be formed only by resin welding the end portions of the anticorrosion sheets of the adjacent precast plates with anchors, so that the construction period is not prolonged.

In addition, since the precast plate with anchors is formed by embedding a large number of projections on the back surface of the anticorrosion sheet in the mortar layer and firmly fixing the anticorrosion sheet, the anticorrosion sheet can be peeled off by the pressure of the permeated water or the vapor pressure. It does not occur, and the ends of the anticorrosion sheet are firmly and watertightly joined by resin welding, so this joint may crack due to the pressure of the permeated water or vapor pressure, or chemicals, etc. may come from the joint. No leaks. Therefore, the concrete floor surface constructed by this anticorrosion method can exhibit an excellent anticorrosion effect over a long period of time.

Further, as in the method for preventing corrosion of a concrete wall according to the present invention, a precast plate with anchors is erected to form an inner mold or an outer mold or both molds, and the inner and outer molds are connected by a tension member. When a precast plate with anchors is firmly fixed by placing concrete between the frames and used as a permanent formwork, the work of bonding anticorrosion sheets or anticorrosion tiles to the concrete wall after demolding as in the conventional case Since it is unnecessary, the construction period is not prolonged, and a concrete wall surface with excellent anticorrosion properties can be easily constructed simply by welding resin ends of the anticorrosion sheets of the precast plate with anchors.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a construction procedure of a concrete floor anticorrosion method according to the present invention. According to this embodiment, first, as shown in FIG. H
Concrete 1 is cast at a height h from which the thickness T of the precast plate with anchor (the plate thickness not including the anchor) is subtracted in advance to finish the surface almost horizontally. Then, a support 2 serving as a ruler for horizontally laying and arranging the precast plates is placed in the concrete 1. As the support 2,
Hardware or concrete blocks having a T-shaped cross section as shown in the figure are used, and the upper surfaces of the supports 2 are all aligned to have a height h.

Next, before the concrete 1 has hardened yet, as shown in FIG.
The concrete 1 is hardened with the anchor 4 projecting from the back surface of the precast plate 3 embedded in the surface of the concrete 1 while the end of each precast plate 3 is supported by the support 2 and kept horizontal. When the concrete 1 is hardened while the anchor 4 is embedded in this way, the anchor 4 cannot be removed from the concrete 1 and the precast plate 3 is firmly fixed. Then, the space between the precast plates 3 that are laid out is filled with non-shrinkable mortar (not shown). If the gap is small, an epoxy resin or the like may be filled.

The above precast plate 3 with anchor is
As shown in FIG. 4, the anticorrosion sheet 3a is fixed to the surface of the mortar layer 3b, and a plurality of anchors 4 are protruded from the back surface of the mortar layer 3b. Of the reinforcing material 3c is embedded.

The anticorrosion sheet 3a on the surface of the precast plate is
Corrosion resistance, good polyvinyl chloride chemical resistance, polypropylene, obtained by molding a synthetic resin such as polyethylene, as shown in FIG. 4, a number of projections 30a on the sheet back side thousand
Each of the protrusions 30a is provided in a bird-like shape, and is provided in a protruding manner .
As shown in FIG. 5, a pair of projecting pieces 31a, 31a inclined in directions away from each other are connected by an intermediate connecting piece 32a. The anticorrosion sheet 3a is firmly fixed to the surface of the mortar layer 3b by burying the projections 30a in the mortar layer 3b so as not to come out. The protrusion 30a is not limited to the shape shown in the figure, but may be any shape such as a T-shaped cross section, an arrow, a mushroom, or any other shape as long as its tip bulges and does not come off the mortar layer 2b .

The anchor 4 projecting from the back surface of the precast plate is made of a concavely curved metal or the like.
Both upper ends of the anchor 4 are fixedly attached to the reinforcing member 3c so as not to fall off from the b. This anchor 4
Since the precast plate 3 is cut into the concrete 1 when the precast plate 3 is laid and fixed, the precast plate 3 is fixed. Therefore, in addition to the above-mentioned concave metal parts, a metal rod or an L-leg piece having a bulged portion at the tip end. For example, any protrusion may be used as long as it does not penetrate the concrete 1 and does not come out.

As shown in FIG. 5, the precast plate 3 with an anchor having such a structure is formed such that the anticorrosion sheet 3a is
It is easily manufactured by laying in the formwork 6 with the reference numeral 0a facing upward, placing the reinforcing material 3c to which the anchor 4 is attached on the anticorrosion sheet 3a with the anchor 4 pointing upward, and then pouring the mortar 3b. be able to. In that case,
The protrusions 30a of the board 3a are staggered and protruded.
In this case, compared to the case where continuous ribs are
In all, the filling of the mortar 3b is improved.
This prevents the formation of internal voids in the layer,
A uniform precast plate 3 can be obtained. As the mortar 3b, a normal cement mortar, a high strength mortar such as a polymer cement mortar or a polymer mortar is suitably used. Thickness T of precast plate 3 to be manufactured
The thinner the film, the easier it is to handle, but if it is too thin, there is a risk of cracking. Therefore, the thickness is preferably about 20 mm, and the thickness t of the anticorrosion sheet 3a on the surface is suitably about 3 to 5 mm.

When the laying of the anchored precast plate 3 is completed, as shown in FIG. 3, the ends of the anticorrosion sheets 3a of the adjacent precast plates 3 are welded to each other with a resin 5 so as to be joined in a watertight manner. The anticorrosion sheet 3a of the peripheral precast plate 3 and the anticorrosion sheet of the wall surface are similarly resin-welded. This resin welding is desirably performed using the same type of polypropylene resin rod or high-density polyethylene resin rod as the anticorrosion sheet 3a. Before welding, the joint is cleaned and the end surface of the anticorrosion sheet 3a is cut with a knife or the like. It is desirable to expose the new end face by stripping. By performing such pretreatment, welding defects are eliminated, and joining strength and water tightness are greatly improved.

When the concrete floor surface is constructed by the above-described anticorrosion method, after the hardening of the concrete 1 as in the prior art, the troublesome work of bonding the anticorrosion sheet or the anticorrosion tile to the surface becomes completely unnecessary, and the adjacent precast plates 3 are not required. Since it is only necessary to weld the ends of the anticorrosion sheet 3a to each other with resin, the construction period is not prolonged. In addition, the precast plate 3 with anchors to be laid is formed by the projections 30 on the back of the anticorrosion sheet.
a is embedded in the mortar layer 3b so that it cannot escape and the anticorrosion sheet 3a is firmly fixed, so that the anticorrosion sheet 3a does not peel off due to the pressure of water or vapor pressure penetrating from below. Since the ends of the anticorrosion sheet 3a are firmly and watertightly joined by resin welding, this joint does not crack due to the pressure or vapor pressure of permeated water, and does not leak chemicals or the like from the joint. .
Therefore, the concrete floor surface constructed by the anticorrosion method of the present invention exhibits an excellent anticorrosion effect over a long period of time.

Next, an embodiment of the concrete wall anticorrosion method according to the present invention will be described with reference to FIGS.

In this embodiment, first, as shown in FIG.
An outer formwork 7 for forming a concrete wall is erected, and a plurality of the above-mentioned anchored precast boards 3 are stacked and erected inside the outer formwork 7, and each precast board 3 is connected to the outer formwork 7 via a tension member 8. The inner formwork of the precast plate 3 is formed by connecting at regular intervals. The tension member 8 may be any material as long as the distance between the inner mold frame and the outer mold frame 7 of the precast plate 3 can be kept constant. For example, a foam tie 8b is screwed to both ends of the separator 8a, and a horizontal flap (pipe) is sandwiched. Washer 8c
Of the type that is tightened with a nut is used.

When the assembling of the formwork is completed, concrete 1 is cast between the inner formwork and the outer formwork 7 of the precast plate 3 as shown in FIG. 8, and each anchor 4 of the precast plate 3 is embedded. The concrete 1 is hardened as it is, and the precast plate 3 is firmly fixed.

When the concrete 1 hardens, as shown in FIG. 9, the foam tie 8b, the washer 8c, the horizontal flutter and the like of the tendon 8 are removed, and only the outer form 7 is removed while the precast plate 3 remains as a permanent form. Type. Then, mortar or the like is filled in the hole of the concrete wall 1 after the foam tie 8b has been extracted, and the hole of the anticorrosion sheet 3a on the surface of the precast plate is closed by means of resin welding or the like.
Are welded with the resin 5 in the same manner as described above. It is also possible to lock the separator 8a by providing a locking means such as a screw on the inner frame of the precast plate 3 or to directly attach the separator 8a to the anchor 4. In such a case, , Anticorrosion sheet 3a on the surface of the precast plate
The operation of closing the hole with resin welding or the like can be omitted.

When the concrete wall is constructed by the anticorrosion method as described above, the troublesome work of bonding the anticorrosion sheet or the anticorrosion tile to the concrete wall after removing the inner and outer formwork as in the related art becomes completely unnecessary. The construction period will not be prolonged, and simply by welding the holes of the anticorrosion sheet 3a on the surface of the precast plate 3 (extracting holes of the foam tie) and resin welding between the sheet ends, the concrete wall surface with excellent anticorrosion properties can be easily constructed. be able to.

In this embodiment, only the inner formwork is formed by the precast plate 3 with anchors. However, when the outer surface of the concrete wall is to be protected from corrosion, the outer formwork may be formed by the precast plate 3 and both sides are formed. If it is necessary to prevent corrosion, the inner and outer molds may be formed by the precast plate 3.

[0029]

As is apparent from the above description, according to the method for preventing corrosion of concrete floors and walls according to the present invention, it is troublesome to bond an anticorrosion sheet or an anticorrosion tile to the surface after hardening the concrete as in the prior art. Since no work is required, the construction period can be shortened, and
Concrete floors that can exhibit an excellent anticorrosion effect over a long period of time because they do not cause peeling of the anticorrosion sheet on the surface of the precast plate or cracks at the joints due to the water pressure or vapor pressure penetrating the concrete on the floor or wall Surfaces and walls can be constructed. And the pre-capacitor of the present invention
The strike plate has no internal voids in the mortar layer and has uniform strength.
It becomes

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a state where concrete for forming a floor is cast.

FIG. 2 is a partial cross-sectional view showing a state in which precast plates with anchors are laid out before the concrete on the floor hardens.

FIG. 3 is a partial cross-sectional view showing the end portions of the anticorrosion sheets of adjacent precast plates with anchors, which are welded with resin.

FIG. 4 is a sectional view showing one embodiment of a precast plate of the present invention.

FIG. 5 is a cross-sectional view illustrating a method for manufacturing the precast plate.

FIG. 6 is a partially enlarged perspective view of the anticorrosion sheet fixed to the surface of the precast plate.

FIG. 7 is a cross-sectional view showing a state in which an inner mold formed of a precast plate with anchors and a general outer mold are connected by a tension member 8;

FIG. 8 is a sectional view showing a state where concrete is cast between an inner mold and an outer mold.

FIG. 9 is a cross-sectional view showing a state in which a foam tie or the like of a tendon is removed, an outer mold is removed, and ends of the anticorrosion sheet on the surface of the anchored precast plate are resin-welded.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 concrete 2 support 3 precast plate with anchor 3 a anticorrosion sheet 30 a projection 3 b mortar layer 3 c reinforcing material 4 anchor 5 welding resin 7 outer mold 8 tension member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication E04F 15/18 8702-2E E04F 15/18 A (72) Inventor Kenichi Hotta Azuchi-cho, Chuo-ku, Osaka-shi No. 2-313 in Takiron Co., Ltd. (56) References JP-A-2-192934 (JP, A) JP-A-3-197701 (JP, A) JP-A-1-134116 (JP, U) Kaihei 4-20517 (JP, U)

Claims (3)

(57) [Claims] 1. A mortar anchored precast plate having a synthetic resin anticorrosion sheet fixed to the front surface and an anchor projecting from the back surface is used to cast a mortar anchored precast plate before forming concrete for forming a floor. A method for preventing corrosion of a concrete floor surface, characterized by laying on the concrete, curing the concrete while embedding an anchor, and resin welding end portions of the anticorrosion sheets of adjacent precast plates with anchors. 2. An inner mold or outer mold for forming a concrete wall by erection of a mortar anchored precast plate having a synthetic resin anticorrosion sheet fixed to the front surface and an anchor projecting from the back surface. Or forming both molds,
The inner and outer forms are connected via a tension member, concrete is poured between the inner and outer forms and the concrete is hardened while the anchor is embedded, and the end of the anticorrosion sheet of the adjacent precast plate with anchors Corrosion prevention method for concrete wall, characterized in that parts are welded with resin. 3. A plurality of projections dispersedly provided on the back surface of a synthetic resin anticorrosion sheet are embedded in a mortar layer containing a reinforcing material to fix the anticorrosion sheet to the surface of the mortar layer.
Precast plate with anchors, with anchors projecting from the back of the mortar layer.