JPH05132963A - Anti-corrosion and water proof lining structure of inner face of concrete building and its lining method - Google Patents

Abstract

PURPOSE:To provide a anti-corrosive and water proof lining structure of the inner face of a workable concrete construction in which the synthetic resin plate at true inside face is prevented from peeling off and an excellent anti-corrosion effect and the water proof effect can be realized at the same time. CONSTITUTION:In the anti-corrosive and water-proof lining structure, synthetic resin plates 2 are fixed at the inner face of a concrete construction 1 without adhesion of the synthetic resin plates, in the condition that anchor protrusions 2a of the synthetic resin plates 2 having numbers of anchor protrusions 2a at one side of the plates are buried in the inner face of the concrete structure 1 t6 force the contacting boundary face between the concrete construction 1 and the synthetic resin plates 2 to function as a continuous water pass and to form a drain hole 3 conducting to the contacting boundary face in the concrete construction 1. In this anti-corrosive and water proof lining structure, after the synthetic resin plates 2 are temporarily stuck on the face of inner frame 7 and a cylinder 3a for forming a drain hole is laid down between the synthetic resin plate 2 and the external frame 9, concrete is placed to simultaneously form the concrete construction and adhesion of the synthetic resin plate 2 and the drain hole 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion waterproof lining structure for an inner surface of a concrete structure and a method for the anticorrosion waterproof lining.

[0002]

2. Description of the Related Art The inner surface of a concrete sewage treatment tank or the like is easily corroded, and in severe cases, it may be corroded as the rebar inside the tank wall is exposed. It is considered that the main cause is that hydrogen sulfide generated by anaerobic decomposition of organic matter in sewage dissolves in water to become strongly acidic sulfuric acid, and this sulfuric acid corrodes the inner surface of concrete. In addition, in concrete tanks that store chemicals and processing liquids, the inner surfaces of the tank walls are often eroded by the chemicals and processing liquids.

In order to prevent this, a conventional concrete tank is provided with an anticorrosion lining on its inner surface. A typical construction method is to apply a primer to the inner surface and laminate and adhere a corrosion resistant synthetic resin layer such as FRP. This is the so-called adhesive lining method.

[0004]

However, when the inner surface of a concrete structure constructed underground by excavating the ground such as a sewage treatment tank is protected by the above-mentioned adhesive lining method, the following problems occur. It was

That is, in the concrete structure constructed underground, the concrete itself is a water-permeable material, and since the inner surface is rough and rough, and the synthetic resin layer is difficult to adhere to, underground water around the concrete wall can Penetrates and penetrates into areas of poor adhesion of the synthetic resin layer. When water enters such a poorly adhered area, the synthetic resin layer swells due to the water pressure or vapor pressure and the peeling of the synthetic resin layer progresses.In severe cases, the synthetic resin layer is destroyed and the concrete surface is severely damaged. There was a problem that the surrounding soil was contaminated by the sewage water, the chemical solution, etc. that were eroded and leaked.

In order to deal with such a problem, the concrete structure is sufficiently cured and dried before the lining, and the inner surface portion where infiltration water is seen is waterproofed with quick-hardening cement or the like. However, it often invaded immediately from the vicinity, and it was difficult to completely stop the water. In order to prevent this infiltration of water, it is conceivable to adopt a waterproof method in which the outer surface of the concrete structure is covered with various waterproof sheets.
Applying an anticorrosion lining on the inner surface and waterproofing the outer surface with a sheet is not a good idea because it significantly increases the labor and cost of construction.

The present invention has been made in view of the above, and an object of the present invention is to provide an epoch-making lining structure for the inner surface of a concrete structure capable of simultaneously exhibiting an anticorrosive effect and a waterproof effect, and a lining method therefor. It is in.

[0008]

In order to achieve the above object, the anticorrosion waterproof lining structure of the present invention comprises a synthetic resin plate having a large number of anchor projections formed on one surface thereof and the anchor projections embedded in the inner surface of the concrete structure. In this state, without adhering the synthetic resin plate, it adheres to the inner surface of the concrete structure,
It is characterized in that a drainage hole communicating with a contact interface between a concrete structure and a synthetic resin plate is formed in the concrete structure.

In the anticorrosion and waterproof lining method of the present invention, a synthetic resin plate having a large number of anchor projections formed on one surface is temporarily attached to the mold surface of the inner mold, and drainage is provided between the synthetic resin plate and the outer mold. The present invention is characterized in that concrete is placed between the synthetic resin plate and the outer mold after bridging the hole forming cylinder.

[0010]

According to the anticorrosion waterproof lining structure of the present invention, since the synthetic resin plate adhered to the inner surface of the concrete structure has good corrosion resistance and chemical resistance, corrosion of the inner surface of the concrete structure is prevented for a long period of time. It Moreover, since this synthetic resin plate is fixed at the anchor projections and not bonded to the inner surface of the concrete structure, the contact interface between the synthetic resin plate and the concrete structure excluding the anchor projections functions as a continuous water passage. Fulfill Therefore, when the water that has permeated the concrete structure reaches the contact interface,
Water does not enter the inside of the concrete structure by flowing through the contact interface and discharging from the drain hole to the outside. Since the permeated water is drained in this way, there is almost no increase in water pressure or vapor pressure at the contact interface, and since the synthetic resin plate is firmly fixed with the anchor projection embedded in the inner surface of the concrete structure, There is no risk of the resin plate peeling off due to an increase in water pressure or vapor pressure.

Further, as in the anticorrosion waterproof lining method of the present invention, a synthetic resin plate having anchor projections is temporarily attached to the mold surface of the inner mold, and a drain hole forming cylinder is formed on the synthetic resin plate and the outside. When concrete is laid between the formwork, the anchor projections are embedded in the concrete, the synthetic resin plate is fixed to the inner surface of the concrete structure at the anchor projections, and at the same time, the cylinder is also penetrated into the concrete. A drain hole is formed which is embedded and leads to a contact interface between the concrete structure and the synthetic resin plate.

[0012]

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

FIG. 1 is a sectional view showing an anticorrosion waterproof lining structure for the inner surface of a concrete structure according to an embodiment of the present invention,
2 is a partial perspective view of the synthetic resin plate, and FIGS. 3 and 4 are a partial perspective view and a partial sectional view of the lining structure.

The anticorrosion and waterproof lining structure illustrated in FIG.
A synthetic resin plate 2 is fixed to the entire inner surface of a concrete tank 1 constructed underground by dug down the ground, and a plurality of drain holes 3 communicating with a contact interface between the concrete tank 1 and the synthetic resin plate 2 are provided in the concrete tank 1. It has a structure formed at the bottom of the side wall.

The synthetic resin plate 2 is formed by molding a synthetic resin such as polyvinyl chloride, polypropylene or polyethylene having good corrosion resistance and chemical resistance. As shown in FIG. A large number of anchor projections 2a are formed in a staggered manner. This anchor protrusion 2a
Is a pair of projecting pieces 20a, which are inclined in directions away from each other,
20a and an intermediate connecting piece 21a for connecting the projecting piece. The synthetic resin plate 2 is fixed in a non-separable manner with the anchor projections 2a embedded in the inner surface of the concrete tank 1. Therefore, the synthetic resin plate 2 and the inner surface of the concrete tank 1 are in a non-bonded state, and the contact interface between the two serves as a continuous water passage. The shape of the anchor protrusion 2a is not limited to that shown in the figure, and may be any shape as long as the tip is bulged and does not come off.

As shown in FIG. 3, the joint portion of the synthetic resin plate 2 is water-tightly welded with a welding resin 4 of the same type as the synthetic resin plate so that water that permeates the concrete tank 1 does not enter the inside. ing. As shown in FIG. 4, the drainage hole 3 is formed by embedding a drainage hole forming cylinder 3 a in a lower portion of a side wall of the concrete tank 1 in a penetrating state. The water reservoir tank 10 connected to the drainage hole 3 is formed. Is provided on the outside. And the pipe 5 connected to this water tank 10 is the concrete tank 1
It is led to the ground along the outer surface of the side wall and is open to the atmosphere.

The concrete tank 1 having the inner surface lined with the synthetic resin plate 2 as described above stores sewage, various chemicals, treatment liquids and the like, but the synthetic resin plate 2 covering the inner surface of the concrete tank 1 is preferable. Since it has corrosion resistance and chemical resistance, the inner surface of the concrete tank 1 is prevented from eroding for a long period of time. When the surrounding underground water permeates the concrete tank 1 and reaches the contact interface with the synthetic resin plate 2, this permeated water moves toward the drainage hole 3 toward the drainage hole 3 and collects water from the drainage hole 3. The water flowing out to the tank 10 is evaporated into the atmosphere through the pipe 5. Since the permeated water is drained and evaporated without entering the concrete tank 1 as described above, there is almost no increase in water pressure or vapor pressure at the contact interface, and the synthetic resin plate 2 embeds the anchor protrusions 2a in the inner surface of the concrete tank 1. Since it is firmly fixed in this state, there is no possibility that the synthetic resin plate 2 will peel off due to water pressure or steam pressure, and an excellent waterproof effect will be exhibited.

In this embodiment, the pipe 5 is open to the atmosphere to evaporate the permeated water. However, the pipe 5 may be sucked up by a water suction pump or the like, and the drain hole 3 is provided with a pipe. You may make it connect 5 directly. In short, the method of wastewater treatment may be appropriately determined. In this embodiment, the synthetic resin plate 2 is fixed only to the inner surface of the concrete tank 1. However, in the case of a concrete structure such as a basement or a seabed, the synthetic resin plate 2 is fixed to the outer surface. Complete waterproofing is desirable.

Next, an embodiment of the anticorrosion waterproof lining method of the present invention will be described with reference to FIGS.

According to the lining method of the present invention, the inner formwork 7 is first installed using the support material 6, and the synthetic resin plate 2 is temporarily attached to the mold surface. The temporary attachment of the synthetic resin plate 2 is preferably performed by a method of attaching the edge of the synthetic resin plate 2 using a double-sided adhesive tape 8 as shown in FIG. When the synthetic resin plate 2 is hit with a nail or the like, the work of removing the inner formwork 7 and then cutting off the protruding portion of the nail and welding the resin for waterproofing is extremely troublesome, but it is easy to temporarily attach it with the double-sided adhesive tape 8. In addition, since the inner formwork 7 can be removed and no troublesome work such as resin welding is required, there is an advantage that workability is significantly improved. Further, use of such a double-sided adhesive tape 8 has an advantage that concrete can be prevented from leaking out from the joint of the synthetic resin plate 2. As the double-sided pressure-sensitive adhesive tape 8, for example, one in which an acrylic rubber-based pressure-sensitive adhesive is applied to the surface on the synthetic resin plate side and a polyethylene pressure-sensitive adhesive having a higher adhesive force is applied to the surface on the inner mold side is preferably used. .. Such a double-sided adhesive tape 8 is peeled off from the synthetic resin plate 2 when the inner frame 7 is removed.
This is because the work of peeling it off is unnecessary.

Then, the outer frame 9 is installed by using the support member 6, and the cylindrical body 3a for forming the drainage hole is attached to the synthetic resin plate 2 and the outer frame 9.
It is laid across and fixed between, and if necessary, a reinforcing bar (not shown) is inserted. Then, concrete 1a is cast between the synthetic resin plate 2 and the outer mold 9 to solidify. When the concrete 1a is cast in this manner, the anchor projections 2a of the synthetic resin plate 2 are formed in a staggered manner, so that the concrete 1a can be circulated without a gap to form a side wall of a concrete tank without a gap. .. Then, the anchor protrusion 2a is embedded in the concrete 1a and the synthetic resin plate 2 is firmly fixed at the anchor protrusion 2a, and at the same time, the cylindrical body 3a is also embedded in the concrete 1a in a penetrating state to form the drainage hole 3. It The bottom wall of the concrete tank may be formed by pouring concrete on the bottom and laying the synthetic resin plate 2 on it to solidify the anchor projections 2a.

When the concrete 1a is solidified, the inner formwork 7
The outer frame 9 is removed, and the joint portion of the synthetic resin plate 2 is welded with the welding resin 4. This resin welding can be efficiently performed because the synthetic resin plate 2 is a molded product of the thermoplastic synthetic resin described above, and it is possible to reliably prevent the intrusion of water from the joint portion. Then, the drainage pipe 5 is connected to the drainage hole 3 to complete the construction.

[0023]

As is apparent from the above description, the anticorrosion and waterproof lining structure of the present invention can prevent the inner surface of the concrete structure from being eroded by the synthetic resin plate fixed to the inner surface and penetrates from the surroundings. By discharging water from the drainage hole through the contact interface between the concrete structure and the synthetic resin plate, it is possible to reliably prevent the intrusion of water into the concrete structure. There is no fear of peeling, and since only the inner surface is lined, there is a remarkable effect that the labor and cost of construction can be saved compared to the case of double-sided lining.

The anticorrosion and waterproof lining construction method of the present invention has extremely good workability because the construction of the concrete structure and the inner surface lining can be performed at the same time, and the construction period can be remarkably shortened as compared with the conventional adhesive lining construction method. Has a great effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an anticorrosion waterproof lining structure for an inner surface of a concrete structure according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of a synthetic resin plate used in the present invention.

FIG. 3 is a partial perspective view of the lining structure.

FIG. 4 is a partial cross-sectional view of the same lining structure.

FIG. 5 is a cross-sectional view illustrating a corrosion-resistant and waterproof lining construction method for an inner surface of a concrete structure according to an embodiment of the present invention.

FIG. 6 is a partial perspective view showing an inner mold and an outer mold to which a synthetic resin plate is temporarily attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete tank (concrete structure) 2 Synthetic resin plate 2a Anchor protrusion 3 Drainage hole 3a Drainage hole forming cylinder 4 Welding resin 7 Inner formwork 8 Double-sided adhesive tape 9 Outer formwork 1a Concrete

Claims (2)

[Claims] 1. A concrete structure in which a plurality of anchor projections are formed on one surface of a synthetic resin plate and the anchor projections are embedded in the concrete structure inner surface, and the synthetic resin plate is fixed to the concrete structure inner surface without adhering. An anticorrosion and waterproof lining structure for the inner surface of a concrete structure, characterized in that a drainage hole communicating with the contact interface between the object and the synthetic resin plate is formed in the concrete structure. 2. A synthetic resin plate having a large number of anchor projections formed on one surface thereof is temporarily attached to the mold surface of an inner mold, and a cylinder for drainage hole formation is bridged between the synthetic resin plate and the outer mold. After that, concrete is placed between the synthetic resin plate and the outer formwork, and the anticorrosion and waterproof lining method is applied to the inner surface of the concrete structure.