JP2739112B2 - Side structure of landfill site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a side structure of a landfill site mainly disposed inland for disposing of general waste and industrial waste.

[Prior Art] In order to dispose of general waste and industrial waste, it is widely practiced to set up landfill sites on the sea surface or inland and to put the waste there. In these landfill sites, the side surface, or the side and bottom surfaces are covered with a waterproof layer such as concrete, asphalt, rubber sheet, or synthetic resin sheet so that the harmful components in the waste do not leach out and contaminate the surrounding area. Need to be coated.

Especially in inland landfill sites, the entire bottom and side surfaces must be covered to prevent harmful components from contaminating the groundwater, and workability, economic efficiency, uneven settlement resistance, etc. In view of the above, it is common to use a flexible or extensible waterproof sheet made of rubber or synthetic resin.

It is a general disposal method to first apply a covering material of an appropriate thickness to the bottom surface, put waste therein, and when the material becomes an appropriate thickness, repeat the process of applying the covering material again.
At this time, since the water impermeable sheet generally has an elongation of 200 to 500%, it has an advantage that it easily expands and contracts when receiving the weight of the input waste, absorbs the tensile force, and does not break.

However, landfill sites are generally large and it takes a considerable number of days to fill them all. Therefore, the part laid especially on the side of the laid water-impervious sheet will be exposed to the air for a long time, during which the influence of ozone, organic substances, sunlight, acid rain, etc. in the air will be directly affected. It is inevitable that it will be degraded financially upon receipt. In most cases, waste is transported by dump trucks and thrown into a landfill site. At this time, the waste may collide with the side surface or slide down the side surface to damage the impermeable sheet.

Therefore, in order to compensate for these drawbacks, a double-layer covering sheet in which a protective sheet having a shielding property such as a nonwoven fabric or a canvas and a cushioning property are fixed to the surface of the water-blocking sheet by means of welding or bonding and integrated. It is partly laid along the side of the landfill site.

[Problems to be Solved by the Invention] However, landfill sites generally have a depth of about 20 to 50 m, and the amount of waste put into a covering sheet laid on the side of such a landfill site is reduced. When the weight acts, the portion of the protective sheet having substantially zero elongation such as a nonwoven fabric or a canvas will face the tensile force, and if it reaches a weight greater than its tensile strength, it will tear or be damaged. There is a problem.

The present invention has been made in view of such circumstances, and a water-impervious sheet laid on the side surface to prevent leaching of harmful components in waste put into a landfill site and to prevent leaching has been developed over time. The protective sheet provided on the surface of the seepage control sheet is naturally damaged or cracked by the pulling force applied to the lower side by the input waste, as well as not being deteriorated or damaged or splitting when the waste is charged. The invention was invented for the purpose of providing a side structure of a landfill site which does not open and is not damaged or scattered by wind.

[Means for Solving the Problems] A first means for solving the problems is that a protective sheet is laid on a surface of a water-impervious sheet while maintaining an overlapping state, and the protective sheet is attached to the water-impervious sheet. The second invention is a configuration in which the surface of the water-impervious sheet and the protection sheet are connected to each other in the first invention, and the first and the second inventions are in the third invention. In the second aspect of the present invention, the protection sheet is configured to be extendable downward toward the side surface, and is a means for solving the above problem.

[Operation] The protection sheet supported on the surface of the water-shielding sheet shields the water-shielding sheet from the atmosphere and the sun's rays, and also prevents the input waste from directly hitting the water-shielding sheet. In addition, after laying, the protective sheet is held by the water-impervious sheet to prevent fluttering by wind, and the water-impervious sheet is extended by the extension of the water-impervious sheet due to the downward pulling force applied with the input of waste. Is eliminated by sliding and spreading to prevent damage and tearing.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the first invention, for example, a bottom surface of a landfill site 1 having a predetermined area and a predetermined depth constructed by excavating and shaping a flat ground surface or shaping a valley. 2 and the side surface 3, and furthermore, the impermeable sheet 5 over the top end 4.
Is laid. The impermeable sheet 5 has a thickness of, for example, 1 to 3 m.
m, a width of about 5 to 10 m, and is formed of a member such as soft polyvinyl chloride having water-blocking properties, flexibility, and elasticity, and a large number of sheets have the upper end edge 5a formed along the top end 4. Side surfaces 3 fixed by a stopper 7 inserted into the groove 6 and driven into the ground and an asphalt layer 8 filled in the groove 6 are juxtaposed in the longitudinal direction, and the side edges overlapping each other are joined to each other by welding or bonding. Landfill site 1
Are laid without gaps over the entire bottom surface 2 and side surface 3 and over the entire top end 4.

Further, a protective sheet 9 is laid on the surface of the waterproof sheet 5. The protective sheet 9 is formed of a sheet material having a shielding property and a cushioning property, such as a nonwoven fabric or a canvas having a thickness of about 3 to 10 mm and a width of about 5 to 10 m. The protective sheet 9 is laid from the portion near the side surface 3 of the top end 4 to the entire surface of the side surface 3 and the portion near the side surface 3 of the bottom surface 2 in the surface of the waterproof sheet 5. 5 may be laid only on the side surface 3 portion or over the entire surface.

Furthermore, a locking device is provided on the top end 4 and the bottom surface 2 of the landfill site 1.
10a, 10b are respectively driven at appropriate intervals in the longitudinal direction of the side surface 3, and a rope 11 such as a rope is attached to the surface portion of the protective sheet 9 between these fasteners 10a, 10b. The cable 11 holds the protection sheet 9 while pressing the protection sheet 9 against the surface of the impermeable sheet 5.

According to the embodiment having such a configuration, the water-impervious sheet 5 laid on the surface of the landfill site 1 is formed of soft polyvinyl chloride having flexibility and extensibility and the like. It is excellent in unequal subsidence, and the part of the side surface 3 is shielded from the atmosphere or the sun rays by the shielding sheet 9 having the shielding property arranged on the surface, so it takes a long time to complete the landfill. This also prevents deterioration over time.

Further, even if the waste collides with the side surface 3 or slides down the side surface 3 when the waste is thrown in, the protective sheet 9 covers the water-impervious sheet 5 so that there is no fear of breakage. Even if a thin-walled material is used, leaching of harmful components in waste is prevented over a long period of time, and a highly reliable landfill site is provided.

In addition, the impermeable sheet 5
The water-impermeable sheet 5 dissipates the downward tensile force applied to the protection sheet 9 by displacing the water-impermeable sheet 5 downwards while sliding on the surface of the water-impermeable sheet 5. Is not damaged or split.
At this time, the protection sheet 9 slides very easily because the moisture or rainwater contained in the waste that enters between the water shielding sheet 5 and the protection sheet 9 reduces the friction between them.

Furthermore, since the protection sheet 9 is held on the surface of the water-impervious sheet 5 by the cable 11 stretched along the surface,
It will not be damaged, ruptured or scattered by the wind during the landfill.

FIGS. 2, 3 and 4 show another embodiment of the first invention, in which water impermeable laying on the surface of a landfill site 1 is the same as in the embodiment shown in FIG. The protective sheet 9 is laid on the surface of the sheet 5, and the top end 4 and the side surface 3 of the bottom surface 2 are provided.
A rope 11 is stretched along the surface of the protection sheet 9 between the locking tools 10a and 10b driven into the vicinity of the protection sheet 9, and the protection sheet 9 is held on the surface of the water-blocking sheet 5 by the rope 11. ing. In this embodiment, different from the above-described embodiment, a plurality of cords 11 are stretched from the top end 4 to the bottom face 2 at right angles to the longitudinal direction of the side surface 3. The surface is inserted through through members 12 arranged at appropriate intervals in three directions in the side surface, and bump-like projections 13 larger than the insertion holes of the through members 12 are formed at predetermined intervals. As shown in FIG. 3, the lower projections 13A are in contact with the lower ends of the through members 12A, and the upper projections 13B and 13C are located above the lower projections 13A and 13B. Are arranged so that the distances a and b between the through members 12B and C disposed opposite to each other are sequentially increased upward.

According to the present embodiment, since the cords 11 are inserted and supported by the through members 12 provided on the surface of the protection sheet 9, the protection sheet 9 is securely held by the water-blocking sheet 5, and the effect of preventing the fan from being swirled by the wind. Is big. In addition, since the protrusion 13 formed on the cable 11 cannot pass through the through member 12, unnecessary protection of the protection sheet 9 is restricted, and furthermore, when a certain or more tensile force is applied to the protection sheet 9 due to waste input. The through member 12 is split in order from the lower side of the side surface 3 in response to the tensile force, and the operation of slightly sliding the protective sheet 9 is repeated, whereby the tensile force can be gradually and efficiently eliminated. It is.

FIGS. 5 and 6 show an embodiment of the second invention. The overall structure is almost the same as that of the embodiment shown in FIG. Not been.
Further, the rope 11 holding the protection sheet 9 includes two ropes 11a extending in the vertical direction of the side surface 3 and being stretched at appropriate intervals from each other.
11b, one rope 11a is inserted through a through member 12 provided on the protective sheet 9, and the other sheet 11b is inserted through a through member 14 provided on the impermeable sheet 5. Then, a connecting rope 15 having an end fixed to the rope 11a on the surface of the protection sheet 9 and penetrating the protection sheet 9 between the adjacent through members 12 is provided, and the connecting rope 15 and the rope 11b on the surface of the waterproof sheet 5 are provided. Is loosely bundled by the annular connecting member 16 so that the protection sheet 9 laid on the surface of the water-impermeable sheet 5 is slidably connected to the surface of the water-impermeable sheet 5 toward the side surface 3 by a predetermined distance. ing.

According to this embodiment, the rope 11 attached to the protection sheet 9
a and the rope 11b attached to the impermeable sheet 5
Since the protection sheet 9 and the water-blocking sheet 5 are connected to each other by the connecting member 16, the protection sheet 9 can be reliably prevented from being broken or scattered by the wind.

FIGS. 7 and 8 show another embodiment of the second invention, and the overall structure is almost the same as that of the embodiment shown in FIGS. 5 and 6. Unlike the example in which the ropes 11a and 11b constituting the cable 11 are inserted through the through members 12 and 14 and attached to the surfaces of the protective sheet 9 and the water-impervious sheet 5, respectively, the ropes 11a and 11b are respectively impermeable sheets. 5 and a plurality of load distribution members formed of steel, hard synthetic resin or the like formed of steel, hard synthetic resin, or the like, which are disposed at appropriate intervals on the surface of the protection sheet 9 and which are fixed by the fixing members 17. In that they are attached to the surfaces of the water-impervious sheet 5 and the protective sheet 9 by being connected to the supporting rods 18 for use.

According to the present embodiment, the impermeable sheet 5 and the protection sheet 9
The ropes 11 and the load-dispersing support rods 18 provided on the surfaces of the pegs disperse the external forces acting on the entire surface, so that the water-impervious sheet 5 and the protective sheet 9 are locally exposed to the wind. Even if pushed, it has a great effect of preventing damage, tearing and scattering.

In this embodiment, the support rods 18 are provided on both the water shielding sheet 5 and the protection sheet 9. However, the support rods 18 are provided only on the protection sheet 9 which is easily affected by wind. The water sheet 5 may have the same configuration as the embodiment shown in FIG.

In each of the embodiments shown in FIGS. 1 to 8, since the edge on the top end 4 side of the protective sheet 9 is overlapped with the edge on the top end 4 side of the water-blocking sheet 5, it is discarded. When the protective sheet 9 slides downward on the side surface 3 due to the pulling force caused by the input of an object, there is a concern that a part of the waterproof sheet 5 may be exposed. This problem can be easily solved by taking measures such as providing the extra length portion held by the top end 4 when the portion laid on the side surface 3 slides in the direction of the bottom surface 2. it can.

FIGS. 9 and 10 show an embodiment of the third invention. Like the above embodiments, a protective sheet is provided on the surface of a water-impervious sheet 5 laid without any gap on the surface of the landfill site 1. 9 are laid. The protection sheet 9 is provided with a hook 10a driven into the top end 4 and a cord 11 laid on a locking tool (not shown) driven near the side surface 3 on the bottom surface. It is inserted through the through members 12 arranged at appropriate intervals in the vertical direction, and is slidably held on the surface of the water impermeable sheet 5.

In the embodiment shown in FIG. 9, the protective sheet 9 has a configuration in which a plurality of sheet members 9a, 9b, 9c,... In the embodiment shown in FIG. 10, a plurality of slack portions 19a, 19b, 19c,... Extending in the longitudinal direction of the side surface 3 of the landfill site 1 are provided at appropriate intervals in the vertical direction of the side surface 3 by folding. With
The folded edges of the loose portions 19a, 19b, 19c,... Are fixed to each other by a connector 20.

According to these embodiments, when a downward tensile force is applied to the protective sheet 9 along with its own weight and the input of waste, the protective member 9 is subjected to the tensile force by the sheet member 9a, 9a in the embodiment shown in FIG. At least one of 9b, 9c, ... is side 3
By sliding downward, the entire protective sheet 9 is extended, and in the embodiment shown in FIG. 10, the connecting body 20 is cut and the loose portions 19a, 19b,
Since at least one of 19c, ... is extended to eliminate the tensile absorption force, there is no damage or splitting.

In the embodiment shown in FIG. 10, each of the loose portions 19a, 19b, 19, 19
The loosening portions 19a, 19b, 19, 1 are formed by gradually decreasing the fixing strength of the connecting body 20 at c,.
9c,... Are sequentially extended from below as the waste is put in, and the tensile force can be eliminated efficiently in a stepwise manner. Further, in the present embodiment, since the loosened portions 21a, 21b and 21c are formed on the water-blocking sheet 5 as well as the protective sheet 9, the water-blocking sheet 5 itself can be extended by input of waste to improve durability. Can be. Further, in the embodiment shown in FIG. 9, similarly to the embodiment shown in FIG. 10, the connection ends of the respective sheet members 9a, 9b, 9c,. Is formed in order from the top end 4 side to the lower side, so that the sheet member can be slid stepwise from the lower sheet member in order and spread, and the tensile force can be surely eliminated.

[Effects of the Invention] As described above, in the present invention, since the protective sheet having the shielding property is laid on the surface of the water-impermeable sheet, it is shielded from the air and the sun rays, and even if it takes a long time to complete the landfill. This prevents deterioration over time and eliminates the risk of damaging the seepage control sheet even if the waste collides with the side surface or slides down the side surface when thrown in. The purpose of the present invention is to provide a highly reliable landfill site by preventing leaching of harmful components in waste over the years. Also,
Since the impermeable sheet is in direct contact with the landfill site, it is excellent in terms of workability, economic efficiency, unequal settlement resistance, etc.

On the other hand, since the protective sheet is held or connected to the surface of the impermeable sheet laid and fixed at the landfill site, there is no fear that the protective sheet will be damaged, split or scattered by the wind. In addition, since the protective sheet slides on the surface of the waterproof sheet, and in addition to the sliding, the protective sheet itself extends, the self-weight and the tensile force in the bottom direction applied with the input of waste are effectively used. There is no damage and no splitting.

[Brief description of the drawings]

FIG. 1 is a partial perspective sectional view showing an embodiment of the first invention,
FIG. 2 is a perspective partial sectional view showing a different embodiment of the first invention, and FIGS. 3 and 4 are ropes of the embodiment shown in FIG.
FIG. 5 is an explanatory view showing the operation of the projection 11 and the projection 13, FIG. 5 is a partial perspective view showing an embodiment of the second invention, FIG. 6 is an enlarged partial view showing a part of FIG. FIG. 7 is a perspective partial sectional view showing a different embodiment of the second invention, FIG. 8 is an enlarged partial view showing a part of FIG. 7, and FIGS. 9 and 10 are third inventions, respectively. FIG. 4 is a partial cross-sectional perspective view showing an embodiment of the present invention. 1 ... landfill site, 3 ... side view, 5 ... impermeable sheet, 9 ... protection sheet.

Claims (3)

(57) [Claims] 1. A protection sheet (9) is laid on a surface of a water-impervious sheet (5) laid along a side surface (3) of a landfill site (1) while maintaining an overlapping state. A side structure of a landfill site, wherein a protective sheet (9) is slidable with respect to the impermeable sheet (5). 2. The side structure of a landfill according to claim 1, wherein the protection sheet (9) is connected to the impermeable sheet (5). 3. The side structure of a landfill site according to claim 1, wherein the protection sheet (9) is extendable downwardly on the side surface (3).