JP4076673B2 - Sealing material and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing material for preventing rainwater and the like entering from the hem of a storage tank and preventing corrosion of a tank bottom plate.
[0002]
[Prior art]
The bottom plate of a storage tank, for example, an annula plate of an oil tank, may move up and down depending on the presence or absence of oil in the tank or the outside air temperature, creating a gap between the concrete foundation and the annula plate as the installation base. . In other words, the annula plate is flat when oil is in it, and its end is in close contact with the concrete foundation. Corrodes the bottom plate of the tank.
[0003]
Therefore, conventionally, as shown in FIG. 3A, a waterproof sheet 10 has been laid so as to cover the end portion of the annula plate 8. The waterproof sheet 10 has a flat plate shape, and is closely attached so that the space between the installation base 7 and the annular plate 8 can be stopped. However, since the displacement of the annular plate 8 is locally large, a load is directly applied to the waterproof sheet 10 due to the behavior of the annula plate 8, and the waterproof sheet 10 may be torn as shown in FIG.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sealing material that can follow the behavior of a storage tank bottom plate such as an annual plate without directly placing a burden on the sealing material, and a construction method therefor.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, the gist of which is to provide a folded portion at one end of the flexible member, the lower surface of the folded portion and the lower surface of the other end of the flexible member, Each of the sealing materials serves as a watertight attachment portion to the installation base or the bottom plate of the storage tank, and preferably the folded portion has a cross-sectionally-letter shape and stores the longer one with the different arm lengths. It relates to a sealing material that is adapted to attach the shorter side to the installation base on the bottom plate of the tank. The flexible member is an EPDM vulcanized rubber having a breaking elongation of 450% or more, a tensile strength of 75 kgf / cm 2 or more, and a tear strength of 25 kgf / cm or more, and a thickness of 2.0 mm or more and 5. It is a sealing material in which a self-adhesive layer of unvulcanized rubber-based butyl rubber having a breaking elongation of 1300% or more is provided on each of the watertight mounting portions.
[0006]
In addition, as a method of applying the sealing material, a base reinforcing agent is applied to the installation base, and an iron part base treating agent and a butyl rubber base treating agent are applied to the bottom plate of the storage tank, and the lower surface of the folded portion at the end of the flexible member and the possible The watertight attachment part with a butyl rubber self-adhesion layer on the lower surface of the other end of the flexible member is bonded to the installation base or the bottom plate of the storage tank, respectively, so that the water between the installation base and the bottom plate of the storage tank is stopped. is there.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The sealing material of the present invention is made of a flexible member. Various rubbers, resins, and the like can be used as the flexible member, but EPDM-based or butyl rubber-based vulcanized rubber that is weather-resistant rubber is preferable. Further, water resistance and durability are also required, and it is particularly preferable that the breaking elongation is 450% or more, the tensile strength is 75 kgf / cm 2 or more, and the tear strength is 25 kgf / cm or more. Furthermore, the thickness of the flexible member is preferably 1.0 mm or more in consideration of durability and the like. In particular, the installation stability in the circumferential direction of the storage tank, that is, the familiarity of the sheet with the dog running portion and the overall From the viewpoint of typical workability, it is preferable to set the thickness to 2.0 mm. However, even if the thickness exceeds 5.0 mm, the installation stability does not change.
[0008]
Further, the sealing material of the present invention has a folded portion at one end of the flexible member. That is, by turning up, for example, a letter shape is obtained. Therefore, even if a gap is formed between the bottom plate of the storage tank and the installation base, the displacement is absorbed by the rising of the L-shaped tip, so that it does not break like a conventional waterproof sheet. It is. The folded portion is not limited to a letter shape, but may be a letter shape, a Z shape, an S shape, or the like. In addition, when installing the sealing material of the present invention, if the long side of the letter shape with different arm lengths is bonded to the bottom plate of the storage tank and the short side is bonded to the installation base, the top of the letter shape will be on the installation base side. However, in this case, the sealing material acts so that the installation base side is lifted by the behavior of the tank bottom plate to absorb the displacement. However, conversely, the shorter arm may be used as the tank bottom plate side, and in this case, the L-shaped tip is lifted on the tank bottom plate side.
[0009]
Furthermore, if a self-adhesive layer of unvulcanized rubber-based butyl rubber is provided in the watertight mounting portion of the sealing material, the stress on the lower surface of the mounting portion generated when the sealing material is lifted can be relieved. The unvulcanized rubber-based butyl rubber is preferably one having a breaking elongation of 1300% or more.
[0010]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a sealing material of the present invention. The flexible member 2 constituting the sealing material 1 is an ethylene / propylene / terpolymer, has a breaking elongation of 450% or more, a tensile strength of 75 kgf / cm 2 or more, and a tear strength of 25 kgf / cm or more. A 6008 certified product. The thickness is 2.0 mm. As shown in FIG. 1, the flexible member 2 is provided with a folded portion 3 at one end, and has a letter shape as a whole. The length of the longer arm in the letter shape, that is, the total width L1 of the sealing material is 300 mm, and the width L2 of the shorter arm is 110 mm. In addition, the L-shaped tip portion 4 is integrated to double the thickness of 4.0 mm, and the width L3 of the tip portion 4 is 20 mm.
[0011]
Further, an unvulcanized butyl rubber adhesive sheet 5 having a thickness of 0.7 mm and a width of 80 mm is attached to the lower surface of the long arm having a letter shape, and the bottom plate of the storage tank, that is, the oil tank in this embodiment. Bonded to the annula plate. On the other hand, an unvulcanized butyl rubber adhesive sheet 6 having a thickness of 0.7 mm and a width of 60 mm is also attached to the lower surface of the shorter arm of the letter shape, and is adhered to the installation base, that is, asphalt mortar in this embodiment. The In addition, the release paper is attached to the unvulcanized butyl rubber adhesive sheets 5 and 6 before construction.
[0012]
FIG. 2 is a cross-sectional view showing the behavior when the sealing material of the present invention is applied to an annula plate of a petroleum tank. In this embodiment, the longer side of the letter shape with different arm lengths is bonded to the annula plate 8 and the shorter side is bonded to the asphalt mortar 7. In the state where no oil is contained in the tank, the end of the annular plate 8 is bent upward and deformed as shown in FIG. 2, but the letter-shaped tip 4 of the flexible member 2 is lifted and the letter is Opens and the deformation is absorbed. Therefore, since the burden is not applied to the sealing material, it is possible to ensure excellent water stop without breaking. Here, the lift of the tip 4 and the degree of opening of the letter shape are mainly determined by the length of the opening (L2-L3) and the width of the unvulcanized butyl rubber adhesive sheet 6 bonded to the asphalt mortar 7, It is selected appropriately according to the situation of the location.
[0013]
Next, a method for applying the sealing material of the present invention to an annulus plate of a petroleum tank will be described. First, if there is an existing waterproof sheet, it is removed. Also, remove dust and foreign substances from the annula plate, asbestos mortar, which will be the installation base, and clean it. Next, Sandine 121 (an asphalt mortar base reinforcing agent) is applied to the asphalt mortar to treat the base. On the other hand, Sandine 732B (iron part surface treating agent, butyl rubber ground surface treating agent) is applied to the annula plate. Further, sandine 732B is further applied to asphalt mortar, and sandine 732B is also applied to the butyl rubber self-adhering layer of the sealing material. Then, after the alignment, the longer ones in the letter shape with different arm lengths of the sealing material are attached to the annula plate and the shorter ones are attached to the asphalt mortar to complete the construction.
[0014]
The sealing material having a length of 2 m and a thickness of 2.0 mm shown in the embodiment of the present invention is applied to the annulus plate of the oil tank by the method of the embodiment, and the sealing material is contaminated, peeled, misaligned, damaged (tear, hole) As a result of inspection after 1 month, 3 months, and 6 months, no abnormalities were found as a result of seven items of (drilling), deterioration (surface crack, carbonized), swelling, and water accumulation (water intrusion).
[0015]
【The invention's effect】
In the sealing material of the present invention, for example, a letter-shaped folded portion is provided at one end of the flexible member, and the lower surface of the folded portion and the lower surface of the other end of the flexible member are respectively connected to the installation base or the bottom plate of the storage tank. Since the watertight mounting portion is used, even if a gap is generated between the installation base and the bottom plate of the storage tank, the folded portion is lifted so that the displacement is absorbed and the conventional waterproof sheet is not broken. If the flexible member is an EPDM vulcanized rubber having a breaking elongation of 450% or more, a tensile strength of 75 kgf / cm 2 or more, a tear strength of 25 kgf / cm or more, and particularly a thickness of 2 mm or more, If the self-adhesive layer of unvulcanized rubber-based butyl rubber with a breaking elongation of 1300% or more is provided in each of the watertight mounting parts, the stress generated in the sealing material will be excellent. Can be relaxed.
[0016]
The sealing material construction method of the present invention includes applying a base reinforcing agent to the installation base and applying an iron base treating agent and a butyl rubber base treating agent to the bottom plate of the storage tank, and a folded portion at one end of the flexible member. By attaching the watertight attachment part with a butyl rubber self-adhesive layer on the bottom surface and the bottom surface of the other end of the flexible member to the installation base or the bottom plate of the storage tank, respectively, the water between the installation base and the bottom plate of the storage tank is stopped. Therefore, it is possible to prevent rainwater entering from the periphery of the tank skirt and effectively prevent corrosion of the tank bottom plate.
[Brief description of the drawings]
FIG. 1 is a side view showing a sealing material of the present invention.
FIG. 2 is a cross-sectional view showing the behavior when the sealing material of the present invention is applied to an annula plate of an oil tank.
FIG. 3 is a cross-sectional view showing the behavior when a conventional waterproof sheet is applied to an annula plate of an oil tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Seal material 2 Flexible member 3 Folding part 4 Tip part 5 Unvulcanized butyl rubber adhesive sheet 6 Unvulcanized butyl rubber adhesive sheet 7 Installation base (asphalt mortar)
8 ... Bottom plate of storage tank (annular plate)
10 ··· Waterproof sheet L1 · L-shaped long arm length (full width of sealing material)
L2 ... Length of the shorter arm of L shape L3 ... Width of the tip of L shape

Claims (6)

In the sealing material that stops water between the installation base and the bottom plate of the storage tank, a folded portion is provided at one end of the flexible member, and the bottom surface of the folded portion and the bottom surface of the other end of the flexible member are respectively connected to the installation base or A sealing material characterized in that it is a watertight attachment portion with a bottom plate of a storage tank. 2. The folded portion has a letter shape in cross section, and the longer one with the different arm length is attached to the bottom plate of the storage tank, and the shorter one is attached to the installation base. The sealing material as described in. 3. The seal according to claim 1, wherein the flexible member is an EPDM vulcanized rubber having a breaking elongation of 450% or more, a tensile strength of 75 kgf / cm 2 or more, and a tear strength of 25 kgf / cm or more. Wood. The sealing material according to claim 1, wherein a thickness of the flexible member is 2.0 mm or greater and 5.0 mm or less. 5. The sealing material according to claim 1, wherein a self-adhesive layer of unvulcanized rubber-based butyl rubber having a breaking elongation of 1300% or more is provided in each of the watertight mounting portions. Apply base reinforcing agent to the installation base and apply iron part base treating agent and butyl rubber base treating agent to the bottom plate of the storage tank, and butyl rubber on the lower surface of the folded portion at one end of the flexible member and the lower surface of the other end of the flexible member A sealing material construction method characterized in that a watertight attachment portion with a self-adhesive layer is bonded to an installation base or a bottom plate of a storage tank to stop water between the installation base and the bottom plate of the storage tank.

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