JPH0542391U - Lining structure of concrete structure - Google Patents

Abstract

(57) [Summary] [Purpose] Welding of seams can be performed with good workability without pinching copper wires etc. in the seams of covering materials, and the presence or absence of pinholes at welded points can be easily inspected with a pinhole tester. A lining structure for a concrete structure is provided. [Structure] In a lining structure in which a covering material 2 is laminated and fixed on the ground of a concrete structure 1 and a seam of the covering material 2 is welded with a welding material 4, a conductive adhesive tape is attached to the back side of the seam of the covering material 2. And eliminate copper wires from being caught in the seam.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete lining structure capable of easily inspecting whether or not there is a pinhole at a joint portion of a welded covering material.

[0002]

[Prior Art]

 The inner surface of concrete sewage treatment tanks is easily eroded, and in severe cases, it may be eroded enough to expose the reinforcing bars inside the tank wall. It is thought that the main reason for this is that hydrogen sulfide generated by anaerobic decomposition of organic matter in sewage dissolves in water to form strongly acidic sulfuric acid, and this sulfuric acid corrodes the inner surface of concrete. Also, in concrete tanks that store chemicals and processing liquids, the inner surface of the tank wall is often eroded by the chemicals and processing liquids.

To prevent this, for example, as shown in FIG. 6, a covering material 102 such as a synthetic resin sheet or a synthetic resin plate is laminated and fixed on the inner surface (inner ground surface) of a concrete tank 101 with an adhesive or the like, The anticorrosion lining method of welding the joint portion of the covering material 102 with the welding material 103 such as welding resin has been conventionally used. In that case, if there is a pinhole in the welded part, the liquid in the tank will infiltrate through the pinhole and corrode the inner surface of the concrete tank, so it is necessary to inspect the presence of the pinhole after welding.

A typical example of this inspection is an inspection method in which a pinhole tester is used and high frequency discharge is generated at a high voltage to check the presence or absence of a pinhole. Therefore, in order to be able to perform this inspection, conventionally, as shown in FIG. 6, a copper wire 104 is sandwiched in a joint portion of a covering material 102, and a welding material 103 is welded over the copper wire 104 to thereby form a pinhole tester 105. If there was a pinhole when they were brought close to each other, discharge was made to occur between the copper wire 104.

[0005]

However, when the copper wire 104 is sandwiched and welded in the joint portion of the covering material 102 as described above, the work of sandwiching the copper wire 104 is troublesome and the welding work is difficult. There is a problem that it becomes difficult and welding defects are likely to occur.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to perform an inspection by a pinhole tester and to further improve the welding workability of a joint of a covering material and to provide a good concrete structure. To provide a lining structure for an object.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a conductive adhesive tape on the back side of the seam of the covering material in a lining structure in which the covering material is laminated and fixed on the ground surface of the concrete structure and the seam of the covering material is welded with a welding material. Is attached.

[0008]

[Action]

 According to the lining structure of the present invention, since the conductive adhesive tape is adhered to the back side of the seam of the covering material, it is not necessary to sandwich a copper wire or the like in the seam, and the seam can be welded as it is. It is easy to remove, and welding defects are hardly generated. Then, when the pinhole tester is brought closer after welding, if there is a pinhole in the welded portion, a discharge is generated between the pinhole tester and the conductive adhesive tape, so that the presence or absence of the pinhole can be inspected immediately.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a lining structure of a concrete structure according to an embodiment of the present invention, FIG. 2 is a partial perspective view of a covering material, and FIG. 3 is a partial perspective view of the same lining structure.

In the lining structure illustrated in FIGS. 1 and 3, the coating material 2 is laminated in a non-adhesive state on the inner surface (inner concrete ground surface) of the concrete tank 1 constructed by excavating the ground underground. It is fixed, and the conductive adhesive tape 3 is attached to the back surface of the seam of each covering material 2, and each seam is welded in a watertight manner by a welding material 4. Further, a plurality of drain holes 5 communicating with the contact interface between the concrete tank 1 and the covering material 2 are formed in the lower side wall of the concrete tank 1, and a drain pipe 6 is connected to each drain hole 5. The drainage pipe 6 is led to the ground and opened to the atmosphere.

As shown in FIG. 2, the coating material 2 used in the present invention has a large number of anchor projections 2b on one surface of a synthetic resin plate 2a such as polyvinyl chloride, polypropylene, or polyethylene having good corrosion resistance and chemical resistance. The anchor protrusions 2b are formed integrally by being dispersed in a staggered manner, and each of the anchor protrusions 2b has a pair of protrusions 20b, 20b inclined in directions away from each other and an intermediate coupling piece 21b for coupling the protrusions. Then, with the anchor projections 2b embedded in the inner surface of the concrete tank 1, the covering material 2 is fixed in a non-separable manner. Therefore, the coating material 2 and the inner surface of the concrete tank 1 are in a non-bonded state, and the contact interface between them serves as a continuous water passage as described later. The shape of the anchor protrusion 2b is not limited to that shown in the figure, and may be any shape as long as the tip is swollen and cannot be pulled out.

The conductive adhesive tape 3 attached to the back surface of the seam of the covering material 2 is preferably a metal tape such as an aluminum foil or a copper foil having an adhesive applied on one side, and the seam is welded. As the material 4, a welding resin similar to that of the coating material 2 is preferably used.

The concrete tank 1 having such a lining structure is efficiently constructed by the following method. That is, as shown in FIG. 4, the covering material 2 is temporarily attached to the mold surface of the inner mold 7 of the concrete tank with the double-sided adhesive tape 8 or the like, and the conductive adhesive tape 3 is attached to the joint of the covering material 2. . Then, a cylinder (not shown) for forming drainage holes is bridged between the covering material 2 and the outer mold 9 of the concrete tank, concrete is placed, and after demolding, the seam of the covering material 2 is resin-welded. The material 4 is welded in a watertight manner, and the drainage pipe 6 is connected to each drainage hole 5.

When the concrete is poured as described above, the anchor projections 2a of the covering material 2 are formed in a staggered manner, so that the concrete circulates without any gaps and the concrete tank 1 without voids is formed. The anchor protrusion 2a is embedded in the concrete, and the covering material 2 is firmly fixed at the anchor protrusion 2a. Since the conductive adhesive tape 3 is attached to the seam of the covering material 2 before the concrete is placed, concrete does not leak from the seam, and the seam of the covering material 2 is removed from the seam. When welding with the resin welding material 4, it is not necessary to insert an obstructive copper wire or the like into the joint as in the conventional case, and the welding operation can be performed as it is. Therefore, the workability of welding is greatly improved and the number of welding defects is greatly reduced.

In the concrete tub 1 having the inner surface lining structure as described above, the conductive adhesive tape 3 is attached to the back surface of the seam of the covering material 2. Therefore, as shown in FIG. When there is a pinhole, a discharge is generated between the adhesive tape 3 and the conductive adhesive tape 3. Therefore, it is possible to immediately inspect whether or not there is a pinhole at the welded portion depending on the presence or absence of discharge.

Although sewage, various chemicals, treatment liquids, etc. are stored in the concrete tank 1, the synthetic resin coating 2 covering the inner surface of the concrete tank 1 has good corrosion resistance and chemical resistance. Therefore, it is possible to prevent erosion of the inner surface of the concrete tank 1 for a long period of time. Moreover, since the coating material 2 is not adhered to the concrete tank 1 but is fixed by the anchor projections 2b, the contact interface between the both functions as a water passage for water that permeates the concrete tank 1. Therefore, when the surrounding underground water permeates the concrete tank 1 and reaches the contact interface with the coating material 2, the permeated water moves through the contact interface toward the drain hole 5 and flows out from the drain hole 5. Water evaporates into the atmosphere through the drainage pipe 6. Therefore, since the water pressure or vapor pressure of the permeated water at the contact interface hardly rises, there is no possibility that the coating material 2 is peeled off by the water pressure or vapor pressure, and an excellent waterproof effect is exhibited.

In this embodiment, the drainage pipe 6 is opened to the atmosphere to evaporate the permeated water, but it may be configured to suck up the water with a water suction pump or the like, and the drainage hole 5 is used. A water tank may be provided between the drainage pipe 6 and the drainage pipe 6. In short, the method of wastewater treatment should be decided appropriately. Further, although a special synthetic resin coating material 2 having anchor projections 2b is used in this embodiment, a general synthetic resin sheet or synthetic resin plate is used as the coating material and is bonded to the ground of a concrete structure. It goes without saying that you can do it.

[0019]

[Effect of the device]

 As is clear from the above description, the lining structure of the present invention can prevent the erosion of the concrete structure by the covering material, and furthermore, the conductive adhesive tape is attached to the back surface of the seam of the covering material. Therefore, it is not necessary to sandwich copper wire etc. in the seam as in the past, and the welding workability of the seam is greatly improved, and welding defects can be reduced. If a pinhole is present in the welded part, a discharge will occur between it and the conductive adhesive tape, so that the presence of a pinhole can be easily inspected.

[Brief description of drawings]

1 is a sectional view showing an embodiment of a lining structure for a concrete structure according to the present invention.

FIG. 2 is a partial perspective view of a covering material used in the present invention.

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

FIG. 4 is a perspective view illustrating a construction method of the lining structure.

FIG. 5 is an explanatory diagram of a method for inspecting a welded portion in the same lining structure.

FIG. 6 is an explanatory diagram of a method for inspecting a welded portion in a conventional lining structure.

[Explanation of symbols]

 1 Concrete Tank (Concrete Structure) 2 Covering Material 2a Anchor Protrusion 3 Conductive Adhesive Tape 4 Welding Material 7 Inner Form 9 Outer Form

Claims (1)

[Scope of utility model registration request] 1. In a lining structure in which a covering material is laminated and fixed on the ground of a concrete structure, and a seam of the covering material is welded with a welding material, a conductive adhesive tape is attached to the back side of the seam of the covering material. The lining structure of the characteristic concrete structure.