JPH11221540A - Shielding material and its application method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the shielding material excellent in mechanical strength durability, etc., with the sheets satisfactorily bonded to one another, capable of being easily applied and closing up a hole, it any, by itself. SOLUTION: A titanium plate 11 is arranged on the whole surface of the improved soil 10, and further an asphaltic material 12 is applied thereon. The titanium palate 11 is capable of being elongated, excellent in mechanical strength, durability, chemical resistance, etc., hence the infiltration of harmful matter, etc., into the soil 10 is intercepted, and the effect is maintained over a long period. Further, even if the titanium plate 11 has a hole, the asphalitic material 12 flows into the hole, which is thereby closed. Accordingly, the contamination of the coil with harmful matter, etc., is excellently prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding material for preventing a component derived from a substance placed on the ground or the like from entering the ground or the like, and to the shielding material. Related to the construction method.

[0002]

2. Description of the Related Art Shielding materials (protective materials) are used exclusively in waste disposal sites, etc., and are used when constructing waste disposal sites using depressions in mountain depressions, sediment collection sites, and coastal landfills. The above-mentioned shielding material is laid all over the ground surface, and waste is dumped thereon.

[0003] The reason why the shielding material is laid is to prevent harmful substances derived from waste from seeping into the ground and causing soil contamination and groundwater contamination. Therefore, the shielding material is chemically stable. Therefore, it is required to have a property of not being damaged by various substances, having high mechanical strength and not being damaged, and being capable of completely blocking / blocking water for a long period of time.

As a conventional shielding material, for example, a sheet made of an organic polymer such as a polyvinyl chloride resin, a vulcanized rubber resin, a high density polyethylene resin, and a urethane resin is used. The waste tank is formed by laying down a single layer or multiple layers and joining the respective sheet ends.

[0005] In addition to the method of transporting a sheet manufactured at a factory to a site as described above and performing construction, a method of forming a resin raw material into a sheet at a construction site is also employed. A nonwoven fabric serving as a base material is laid on the ground surface, and a liquid polyethylene-based resin material or a urethane-based resin material is sprayed thereon and solidified to form a shielding material layer.

As another shielding material, concrete is sometimes used, and waste is stored in a hardened concrete wall.

[0007]

However, the above conventional shielding materials have not been satisfactory. That is, for example, in a polyvinyl chloride-based resin shielding sheet, the blended plasticizer or the like causes bleeding (diffusion movement) during long use, and the mechanical strength of the shielding material itself is reduced.
There is a concern that the plasticizer or the like bleeding on the surface of the shielding material elutes from the sheet and contaminates soil, groundwater, etc., and adversely affects the surrounding environment. In the case of an organic polymer sheet,
There is a common problem that the stone or the rock is easily damaged by a sharp cornering abutment.

Further, the vulcanized rubber-based resin shielding material sheet is excellent in mechanical strength of the sheet itself, but has poor heat-fusibility between the sheets, so that the strength of the sheet joint portion is insufficient, and the May occur. Although a method of joining the sheets with an adhesive or the like is also conceivable, strong adhesion cannot be maintained for a long period of time.

In the high density polyethylene resin shielding material sheet, since the sheet is hard, the workability of the work is particularly poor on the site having irregularities or inclinations, and requires a high level of skill for the constructor.

[0010] Also, concrete walls are poor in flexibility,
When the ground causes uneven settlement, there is a problem that the stress is biased to cause cracks and the like.

In any case, the above-mentioned conventional shielding material has a problem that once a hole is formed, a liquid component derived from a waste, particularly various harmful substances, flows out from the hole and continues to have a bad influence on the environment. is there.

Therefore, a shielding sheet having a self-healing function has been proposed. The sheet is a laminated sheet in which water-swelled rubber is sandwiched between two layers of synthetic rubber. When a nail or the like is pierced into the laminated sheet and a hole is opened, water enters through the hole and touches the water-swelled rubber of the intermediate layer. The water-swellable rubber absorbs water and expands to close the pores.

However, in the laminated sheet, the synthetic rubber constituting both the front and back layers has a problem in the strength of the sheet joint similarly to the vulcanized rubber resin shielding material.

The present invention has been made in view of the above problems, has excellent mechanical strength and durability, has no elution from the shielding material itself, and can perform good joining between sheets. It is an object of the present invention to provide a shielding material that is easy to use. It is still another object of the present invention to provide a shielding material capable of self-closing even when a hole is opened.

[0015]

The shielding material according to the first aspect of the present invention has a structure in which a titanium or titanium alloy plate is disposed on the surface of a smooth and strong ground or a ground or concrete structure subjected to ground reinforcement. The gist is that there is.

For example, in a waste disposal site, a dump truck or the like that carries waste moves on and off the shielding material or on the waste dumped on the shielding material, and the waste and the like are roughly dumped (shielding material). Dropping on it). Therefore, the shielding material is required to have such a property that it expands by absorbing such external stress and mechanical strength enough to withstand the external stress.

In this respect, the shielding material of the first invention is:
Since a titanium or titanium alloy plate (hereinafter sometimes referred to as a titanium plate as a representative thereof) is used on the surface of a smooth and strong ground or a ground or concrete structure subjected to ground reinforcement, the above-mentioned external stress is applied. It is expected to exhibit the mechanical strength enough to withstand the heat and maintain the shielding function. In order to exhibit the required strength, the titanium plate preferably has a plate thickness of 0.1 mm or more, more preferably 0.3 mm or more. The thickness is preferably 10 mm or less, more preferably 1 mm or less, but it is desirable to appropriately set the plate thickness according to the use environment and use conditions.

In addition, the titanium plate is excellent in corrosion resistance and chemical resistance, so that there is little possibility that a hole is opened due to rust or corrosion. In addition, since the titanium plate is also excellent in durability and weather resistance, it can decay even after long use. It is hardly expected that the shielding effect is maintained for a longer time than the conventional resin shielding material.

Further, since the titanium plate can be completely joined by welding and the strength of the joining portion is sufficient, there is little possibility that a gap is formed in the joining portion even if the plate pieces are joined.

The ground subjected to the ground strengthening treatment includes, for example, a ground treatment with cement, and the smooth and strong ground refers to a case where the ground is originally strong without any reinforcement treatment.

Alternatively, the gist of the shielding material according to the second aspect of the present invention is that a plastic fluid material layer is formed on the surface of a titanium or titanium alloy plate.

As described above, since the shielding material of the present invention uses a titanium or titanium alloy plate (hereinafter, may be referred to as a titanium plate as a representative), a mechanical material capable of sufficiently withstanding the external stress is used. It can be expected to exhibit strength and maintain the shielding function. In order to exhibit the required strength in the second invention, it is preferable that the titanium plate has a plate thickness of 0.1 mm or more, more preferably 0.3 mm or more. Because it will be high, the plate thickness is 1
The thickness is preferably 0 mm or less, more preferably 1 mm or less, but it is desirable to appropriately determine the plate thickness according to the use environment and use conditions.

In addition, as described above, the titanium plate has corrosion resistance,
Since it is excellent in chemical resistance, durability and weather resistance, there is little possibility that holes will be opened, and it will hardly decay even if used for a long time, and it can be expected that the shielding effect will be maintained for a long time. Furthermore, since it is possible to completely join by welding and the strength of the joining portion is sufficient, there is little possibility that a gap is formed in the joining portion.

However, sometimes a sharp object such as a nail contained in the waste material pierces the titanium plate almost vertically and a hole is opened in the titanium plate. Following the nail or the like, it flows into the hole and is filled so as to close the gap (hole). In this way, the holes opened in the titanium plate are also self-repaired, so that there is little possibility that harmful substances derived from wastes leak from the shielding material.

The plastic fluid substance preferably has a viscosity at 20 ° C. of 10 ² to 10 ¹⁰ poise, more preferably 10 ³ poise (20 ° C.) or more and 10 ⁸ poise (20 ° C.) or less. is there. With such a viscosity, it can exhibit good plastic flow, flow into the pores, stay in the pores, and close the pores, and can close the pores. Is desired. The thickness of the plastic fluid material layer is preferably 0.5 mm or more, more preferably 1 mm or more. This is because if it is too thin, it is not possible to secure an amount enough to close the hole, but it is better to set it to be thicker or thinner according to the use environment and use conditions.

Further, a combination of the first invention and the second invention is preferable, that is, a titanium or titanium alloy plate is provided on the surface of a smooth and strong ground or a ground or concrete structure subjected to ground reinforcement. It is preferable that a plastic fluid material layer is formed on the surface of the titanium or titanium alloy plate.

In addition, in the first and second inventions, it is preferable that an oxygen-shielding and ultraviolet-shielding layer is formed on the plastic fluid material layer.

The above-mentioned plastic fluid substance is generally an organic substance, so that it may be hardened or embrittled by ultraviolet rays or oxygen and lose its fluidity. Therefore, by forming an oxygen-blocking and ultraviolet-blocking layer as described above to cover the plastic fluid, the ultraviolet and oxygen can be blocked, and the plastic fluidity of the plastic fluid can be maintained for a long time. it can. In addition, as an oxygen-shielding and ultraviolet-shielding layer, an acrylic resin sheet, a vinyl chloride resin sheet, etc. are mentioned.

The plastic fluid material is preferably an asphalt-based material. Since the asphalt-based material has good adhesion to the titanium plate, coating unevenness does not occur on the entire surface of the applied titanium plate. Therefore, even if a hole is opened in any part of the titanium plate, the asphalt-based material on the hole or in the vicinity of the hole flows therein, and the self-repair can be performed as described above.

The plastic fluid material may be a synthetic resin in addition to the asphalt-based material. For example, a resin having a glass transition point of 30 ° C. or lower (low-crosslinked polyurethane-based, acrylic-based, ethylene-vinyl acetate-based resin, etc.) Is mentioned.

Further, in the first and second aspects of the present invention, it is desired that the plastic fluid material such as the asphalt-based material contains a thermoplastic rubber-based material. By adding a thermoplastic rubber-based material to an asphalt-based material or the like, even in a cold environment, the asphalt-based material can maintain good fluidity and adhesiveness without being cured. In the present specification, the “asphalt-based substance” includes a substance containing a thermoplastic rubber-based substance in asphalt.

Examples of the thermoplastic rubber-based material include synthetic rubbers such as isoprene rubber and butylene rubber. The content of the thermoplastic rubber-based material is 5 w / w% or more and 30 w / w.
% Or less, more preferably 10 w / w% or more, 2
It is 5 w / w% or less, but may be appropriately set according to the use environment and use conditions.

The method for constructing a shielding material according to the third aspect of the present invention comprises:
A large number of titanium or titanium alloy plates are placed on the ground surface, the ends of each titanium or titanium alloy plate are joined by welding and shaped as necessary, and a plastic fluid material layer is placed on each titanium or titanium alloy plate. The gist is to form

By welding as described above, the titanium plates are firmly joined without gaps, and there is very little concern about leakage from the joints. In addition, seam welding is mentioned as said welding method. Since the seam welding method is simple, it can be performed relatively easily and inexpensively even on a site having irregularities or inclinations, and can be welded without gaps.

Further, since the titanium plate can be plastically deformed, it can be arranged so as to follow the unevenness or inclination of the ground surface.

As a method of forming the layer of the plastic fluid substance, there is a method of applying the plastic fluid substance on the titanium plate, for example. Such a coating method is easy to construct.

In the construction method according to the third aspect of the present invention, it is preferable that an oxygen-blocking and ultraviolet-blocking layer is formed on the plastic fluid material layer. Examples of the oxygen-blocking and ultraviolet-blocking layer include a resin film. Examples of the method of forming the resin film include affixing a film or coating a resin raw material.

Further, in the construction method according to the third aspect of the present invention, it is preferable that a ground strengthening process is performed on at least a surface portion of the ground before the titanium or titanium alloy plate is arranged on the ground surface.

Alternatively, in the construction method according to the fourth aspect of the present invention, at least a surface portion of the ground is subjected to a ground reinforcement treatment, and a plurality of titanium or titanium alloy plates are arranged on the ground subjected to the reinforcement treatment. The gist of the present invention is that the end of each titanium or titanium alloy plate is joined by welding and shaped as required.

If the ground surface is soft, when a sharp object contained in the waste pierces the shielding material, the ground surface has no resistance and easily penetrates the shielding material. However, if the ground surface treatment is performed on the surface layer of the ground as in the present invention, the ground surface becomes a resistance and the sharp object pierces the shielding material deeply. So that no or only small holes are drilled. In the case where the plastic fluid material layer is formed (third invention), the formed pores are blocked by the flow of the plastic fluid material as described above, but the smaller pores are still blocked. Since it can be completely performed, it is desirable to perform the ground strengthening treatment as described above.

It is preferable that the ground strengthening treatment is performed by a ground treatment with cement. As the ground treatment using cement, for example, a method in which cement is mixed with the soil on the surface layer of the ground and solidified by rolling, or a method in which a mixed liquid of cement and water is injected into the ground to solidify the soil (deep mixing method) Or a combination thereof.

The compressive strength of the ground surface subjected to the above-mentioned ground strengthening treatment is preferably 1 kg / cm ² or more (more preferably 3 kg / cm ² or more), and the ground strength is 3 t / m ² or more (more preferably 10 t / m ² or more). m ² or more) is preferable, but it is desired to appropriately set these according to the use environment and use conditions.

Further, in the construction method according to the third aspect of the present invention, prior to disposing the titanium or titanium alloy plate on the ground surface, concrete may be cast on the ground surface to form a concrete structure. preferable.

Alternatively, in the construction method according to the fifth aspect of the invention, concrete is cast on the ground surface to form a concrete structure, and a large number of titanium or titanium alloy plates are arranged on the concrete structure. The gist is that the ends of the titanium or titanium alloy plates are joined by welding and shaped as necessary.

As described above, even when a sharp object pierces the titanium plate, the concrete structure acts as a resistance and does not penetrate deeply, so that no holes are formed or only small holes are formed. As described above, in the third aspect of the present invention, although the holes are closed by the flow of the plastic fluid, the smaller holes can completely close the holes. It is desirable to form an object.

The concrete structure has a compressive strength of 1 kg / cm ² or more (more preferably 3 kg / cm ²⁾ as described above.
The above is preferable, and the ground bearing strength is preferably 3 t / m ² or more (more preferably 10 t / m ² or more), but may be appropriately set according to the use environment and use conditions.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the shielding material according to the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples and is not limited thereto. It is also possible to implement the present invention with appropriate modifications within a range that can be adapted to the purpose, and all of them are included in the technical scope of the present invention.

<Embodiment 1> FIG. 1 is a sectional view showing a waste disposal site using a shielding material according to Embodiment 1 of the present invention. A pure titanium plate 11 having a thickness of 0.4 mm is disposed on the entire inner wall of the ground 10 which has been subjected to smooth and strong ground reinforcement, and an asphalt-based material 12 is applied on the pure titanium plate 11 to a thickness of 1 mm. The asphalt-based material 12 is, for example, asphalt containing isoprene rubber having a glass transition temperature of −40 ° C.
It contains 0% w / w. The upper end of the dent is
The solid titanium plate 11 is fixed by coating with concrete 18. On the shielding material constructed in this way,
Waste 13 is dumped.

An example of a method for constructing the above-mentioned waste disposal site will be described below. First, the land that will be the disposal site will be improved. That is, cement and water are mixed into the soil of the surface layer on the entire inner wall of the land with the depression, and the compacted and compacted,
It is referred to as improved ground 10 (ground subjected to ground reinforcement processing).

Next, a strip-shaped pure titanium plate 11 having a thickness of 0.4 mm and a width of 1200 mm is placed on the improved ground 10, and ends of the pure titanium plates 11 are appropriately seam-welded and joined.

FIG. 2 is a perspective view for explaining the seam welding method. The ends 11a of the two pure titanium plates 11 are each raised about 2 cm, and these ends 11a are overlapped. Two rotating electrodes 15 sandwich the overlapped end 11a, rotate in the direction of arrow A while pressing in the direction of arrow P, and proceed in the direction of arrow B. At this time, the rotating electrode 15 is energized, and the pure titanium plate 11 is welded. 1
4 is a seam weld.

The pure titanium plate seam-welded as described above is formed in a state in which the joining portion (end portion 11a) rises. If there is a corner at the base of the rising portion, the corner is formed. There is a concern that the strength of the part may be weakened. However, if the base is rounded, there is no such a concern, and the possibility of generating a weak portion in strength is reduced.

After welding is completed, it may be left standing or may be folded into any of the titanium plates.

FIG. 3 is a perspective view for explaining a welding method when welding locations intersect. The rising portion (joining portion) of the end portion 11a of the pure titanium plate welded earlier is folded down on one of the titanium plate sides, and then the end portions 11a of the welding portions are raised and stacked in the same manner as described above. Perform seam welding. It is not necessary to perform the above-mentioned convolution on all of the rising portions that have been welded earlier, and it may be performed only on the portion to be welded next.

In this way, the pure titanium plate 11 is laid all over the ground to be the disposal site, and if necessary, the pure titanium plate 11 is shaped so as to follow the shape of the ground.

Next, if the asphalt-based material 12 is applied on the entire surface of the pure titanium plate 11 to a thickness of 1 mm, a disposal site in which shielding materials are laid is completed.

Since the asphalt-based material 12 applied to the inclined surface descends by its own weight, it may be partially peeled off above the inclined surface depending on the inclination angle and the like. In this case, a net may be disposed on the surface of the titanium plate, and the asphalt-based material may be entangled with the net to prevent the asphalt-based material from falling. When the net is used in this way, the asphalt-based material can be kept on the surface of the titanium plate even when the titanium plate is set up almost vertically.

Next, the titanium plate 11 is sharpened with a sharp object such as a nail.
The following describes how the shielding material of the present invention self-repairs when a hole is formed in the hole.

FIG. 4 is a sectional view showing this state.
6, a hole 17 is formed in the pure titanium plate 11 as a shielding material. When the nail 16 is pierced in this way, the asphalt-based material 1
2 follows the nail 16 and flows into the hole 17 (arrow C) to close the hole 17. Therefore, harmful substances derived from waste do not leak to the ground 10.

<Embodiment 2> FIG. 5 is a sectional view showing a waste disposal site using a shielding material according to Embodiment 2 of the present invention. In the second embodiment, an acrylic resin sheet 19 is further laid on the shielding member of the first embodiment.

In the second embodiment, since the acrylic resin sheet 19 blocks light (ultraviolet light) and air (oxygen), the hardening of the asphalt-based material 12 is prevented.
Can maintain fluidity over a long period of time.

Incidentally, the improved ground 1 in the first and second embodiments.
Instead of 0, a concrete structure may be provided. For example, it is preferable that concrete is smoothly poured into a thickness of about 50 mm. Further, concrete may be further cast on the improved ground 10 (ground subjected to ground reinforcement processing).

In the first and second embodiments, the case where the asphalt-based material 12 is applied to a thickness of 1 mm is shown, but this thickness may be appropriately set according to the use environment and use conditions. Or even 1 mm or more. Next, a test performed on the shielding material according to the present invention will be described.

FIG. 6 is a cross-sectional view showing a pebble method anti-protrusion object test apparatus. A gravel 21 is put under the cylindrical container 20 having a diameter of 200 mm and crushed. A test material (shielding material) 22 is placed on the gravel 21, and the lower side of the container 20 is sandwiched between both sides of the test material 22. And the upper side is stopped using bolts 23 and sealed. At this time, the test material 22 is placed so that the asphalt-based material-applied surface thereof is in contact with the gravel 21 side.

After water 24 was put on the test material 22 and it was confirmed that there was no leakage, air was blown from the suction port 25 and pressurized from above the water 24 (30 t / m ² (3 kgf / cm ² )) to leak water. Check for cracks and cracks in the test material.

The gravel 21 has a round shape and a size.
Tests were performed for each case using 10 to 20 mm or 20 to 30 mm, or square and 10 to 20 mm, or 20 to 30 mm in size.

[Constant Angle Cone Method Protrusion Resistance Test-Part 1
(No Hole)] FIG. 7 is a sectional view showing a fixed angle cone method projection tester. A constant angle cone 27 is placed on a flat table 26, and a test material 22 is placed thereon such that an asphalt-based material application surface is in contact with the constant angle cone 27, and the table 26 is sandwiched between both sides of the test material 22. The cylindrical upper container 28 (200 mm in diameter) is sealed by bolting. The constant angle cone 27 is a conical shape having a top angle of 60 ° C. and a height of 20 mm, and the tip of the top has a radius of 0.1 mm.

After water 24 was put on the test material 22 and it was confirmed that there was no leakage, air was blown from the suction port 25 and pressurized from above the water 24 (30 t / m ² (3 kgf / cm ² )) to leak water. And the presence or absence of cracks in the test material 22 are checked.

[Constant Angle Cone Method Protrusion Resistance Test-Part 2
FIG. 8 is a cross-sectional view for explaining this test method. The fixed angle cone 2 is placed on the flat base 26 as described above.
7, and the test material 22 is placed thereon so that the asphalt-based material application surface is in contact with the fixed-angle cone 27. Next, the test material 22 is pierced by the fixed angle cone 27 and a hole having a diameter of about 2 cm is formed. The table 26 and the cylindrical upper container 28 are sandwiched between both sides of the test material 22.
(Radius: 200mm) and screw tight. Incidentally, the fixed angle cone 27 is the same as the above-mentioned test method 1, that is, it is a conical type having a top angle of 60 ° C. and a height of 20 mm, and the radius of the top end thereof is 0.1 mm.

Next, water 24 is put on the test material 22 and air is blown from the suction port 25 to pressurize the water 24 (30 t / m ^2).
(3kgf / cm ² )), check for leaks and for new cracks.

The temperature condition in each of the above tests was 0 ° C.
And 20 ° C. In the test at 0 ° C., a small amount of diethylene glycol was added to the water 24 as an antifreeze.

As a test material in the above-mentioned gravel method and fixed angle cone method anti-protrusion test (No. 1 and No. 2), a plate thickness of 0.4 mm was used.
Asphalt-based material (20w / w)
% Asphalt containing 1% isoprene rubber)
(Test material No. 1) and one coated to a thickness of 5 mm (test material No. 2).

Table 1 below shows the results of the above-mentioned gravel method anti-protrusion test and the above-mentioned fixed angle cone method anti-protrusion test-No. 1 (without holes) and No. 2 (with holes).

[0074]

[Table 1]

As can be seen from Table 1 above, test material Nos.
No cracks or water leaks were observed in any of the samples 2, and the film was excellent in shielding effect.

Further, even when a hole was previously formed in the test material as in the above-mentioned fixed angle cone method 2 (with holes), the cracks in the pure titanium plate did not progress further and water leakage occurred. The result is that there is no shielding material, and thus it is understood that the shielding material has self-healing properties. Next, the piercing test will be described.

[Piercing Test] FIG. 9 is a diagram for explaining this piercing test method. A cone 31 having a sectional diameter of 2.5 mm and a radius of 0.1 mm is gently pushed up against the test material 32 to apply a load to the cone 31, and the load at the time when the hole is opened in the test material 32 is defined as a piercing load. .

As the test material 32 in the piercing test,
0.4mm thick pure titanium plate (test material No.3) and 4mm thick
Using a synthetic rubber sheet (test material No. 4)
Fix the test material to the bottom, and a clay layer (thickness: 50mm) under the test material.
3 and a concrete (thickness 30 mm) 34 were tested. The above piercing test was performed three times each, and the average of the results is shown in Table 2 below.

[0079]

[Table 2]

As shown in Table 2, pure titanium plate (test material No.
3) In the case where a hole is not opened until a load as high as 26 kg is applied, and concrete is provided under the test material,
It can be seen that the hole was not opened until a high load of 59 kg was applied, and thus the shield was well shielded.

[0081]

The shielding materials according to the first and second aspects of the present invention are high in strength and excellent in durability, weather resistance and corrosion resistance. Even if a hole is opened, the hole is closed by self-healing by the plastic fluid material, so that the risk of leakage of harmful substances and the like is reduced, and good shielding properties are maintained. In the first aspect of the present invention, since the lower portion of the titanium plate is reinforced by concrete or the like, there is little possibility that a hole is easily formed in the titanium plate.
Therefore, concerns about adverse effects on the surrounding environment such as soil and groundwater are reduced. Such a shielding material can be used as a shielding / water shielding sheet for a roof or wall, a factory wastewater treatment tank, a sedimentation pond, and the like in addition to being used in a waste disposal site. Further, the method for constructing the shielding material according to the present invention is simple.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a waste disposal site using a shielding material according to a first embodiment of the present invention.

FIG. 2 is a perspective view for explaining a seam welding method.

FIG. 3 is a perspective view for explaining a case where welding locations intersect.

FIG. 4 is a cross-sectional view showing how the shielding material of the present invention self-repairs when a hole is made in a titanium plate with a nail.

FIG. 5 is a sectional view showing a waste disposal site using a shielding material according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an apparatus for a pebble method projection test.

FIG. 7 is a cross-sectional view showing an apparatus for a fixed angle cone method projection test (part 1).

FIG. 8 is a cross-sectional view showing an apparatus for a fixed angle cone method projection test (part 2).

FIG. 9 is a view for explaining a piercing test method.

[Explanation of symbols]

 Reference Signs List 10 ground 11 titanium plate 11a end 12 asphalt-based material 13 waste 14 seam welded part 15 rotating electrode 16 nail 17 hole 18 concrete 19 resin sheet 20 container 21 gravel 22, 32 test material 23 bolt 24 water 25 suction port 26 stand 27 Fixed angle cone 28 upper container 31 cone 33 clay layer 34 concrete 35 wooden frame

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Anno 566-1 Kurosaki, Kurashiki-shi, Okayama Prefecture Inside Takao Shoji Co., Ltd. (72) Yoshitaka Yamamoto 4-3-1 Bigocho, Chuo-ku, Osaka Kobe Steel, Ltd. Office Osaka Office

Claims (13)

[Claims] 1. A shielding material characterized in that a titanium or titanium alloy plate is arranged on the surface of a smooth and strong ground or a ground or concrete structure subjected to ground reinforcement processing. 2. The shielding material according to claim 1, wherein a plastic fluid material layer is formed on a surface of the titanium or titanium alloy plate. 3. A shielding material characterized in that a plastic fluid material layer is formed on the surface of a titanium or titanium alloy plate. 4. An oxygen-blocking and ultraviolet-blocking layer is formed on the plastic flowable material layer.
Or the shielding material of 3. 5. The shielding material according to claim 2, wherein the plastic fluid material is an asphalt-based material. 6. The shielding material according to claim 5, wherein the asphalt-based material is an asphalt containing a thermoplastic rubber-based material. 7. A method for constructing a shielding material on a ground surface, comprising the steps of: arranging a plurality of titanium or titanium alloy plates on the ground surface, joining ends of the titanium or titanium alloy plates by welding, and applying as necessary. A method of constructing a shielding material, comprising forming a plastic fluid material layer on each titanium or titanium alloy plate. 8. The method according to claim 7, wherein an oxygen-blocking layer and an ultraviolet-blocking layer are formed on the plastic flowable material layer. 9. The method for constructing a shielding material according to claim 7, wherein a ground strengthening treatment is performed on at least a surface layer portion of the ground before placing the titanium or titanium alloy plate on the ground surface. 10. The method according to claim 7, wherein prior to disposing the titanium or titanium alloy plate on the ground surface, concrete is cast on the ground surface to form a concrete structure. . 11. A method of constructing a shielding material on a ground surface, comprising: performing a ground strengthening process on at least a surface layer portion of the ground, and arranging a plurality of titanium or titanium alloy plates on the ground subjected to the strengthening process. A method of constructing a shielding material, characterized in that the ends of each titanium or titanium alloy plate are joined by welding and shaped as required. 12. The ground strengthening treatment is performed by a ground treatment with cement.
Construction method of the shielding material described in the above. 13. A method of constructing a shielding material on a ground surface, wherein concrete is cast on the ground surface to form a concrete structure, and a plurality of titanium or titanium alloy plates are arranged on the concrete structure. A method for constructing a shielding material, comprising joining the ends of each titanium or titanium alloy plate by welding and shaping as necessary.