JPH0889922A - Waste disposition plant and its building method - Google Patents

Abstract

PURPOSE: To execute reclamation with waste simultaneously with an excavation operation by discharging the sand and soil produced by excavation of the lower side of upper and lower isolating means to sink these upper and lower isolating means into underground walls, throwing the waste to the upper side of the upper and lower isolating means and balancing the pressures acting on the underground walls from the outside and the inside. CONSTITUTION: Box culverts are embedded under the ground and artificial ground 26 are installed thereon and in addition, the underground walls 20 are built by excavating the lower ground in order to build passage spaces 24 for the waste 30 and vehicles 35 for transporting the excavated sand and soil at the time of forming a waste disposition plant 2 under the ground. Subsidence bottom plates 21 capable of subsiding in the underground walls 20 are built below the artificial ground 26. Further, sand and soil transporting shafts 24 are mounted at the holes formed in the subsidence bottom plates 21 and vertical belt conveyors 23 are arranged therein. On the other hand, backholes 22 are installed in the lower spaces of the subsidence bottom plates. The land is reclaimed with the waste 30 by successively repeating respective stages consisting of the excavation below the subsidence bottom plates, the subsidence of the subsidence bottom plates 21 and the upward charge of the waste 30 at the subsidence bottom plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste disposal site and a method of constructing the same, and more particularly, to a waste disposal site for excavating a waste disposal site and at the same time reclaiming the waste. Disposal site and construction method.

[0002]

2. Description of the Related Art In the case of constructing a conventional shaft-type waste disposal site, first, a wall body such as a continuous underground wall that constitutes the side wall of the waste disposal site is constructed in a predetermined area, and this predetermined area is excavated. A vertical shaft space is formed, and then a bottom plate is laid at the bottom of the vertical shaft space to form a waste disposal site. Then, before dumping the waste material into the vertical shaft space or after the vertical shaft space is filled with the waste material, the upper floor slab as a lining plate is installed.

[0003]

However, in the above-mentioned waste disposal site, the dumping of the waste can be started only after the vertical shaft space is completely formed by the wall, and therefore the vertical shaft space is long-term. The inside of the wall is hollow, and the difference in pressure acting on the wall from inside and outside is large. Therefore, in order to withstand this pressure difference, it is necessary to increase the thickness of the wall body, or to provide a support such as an upset or a cut-off in the vertical shaft, which raises a problem that the construction cost increases.

Further, since the waste is dumped after the excavation of the vertical shaft space is completed, a large amount of excavated earth and sand is generated during the excavation in a short period of time, and the disposal thereof becomes a problem. Furthermore, the excavated earth and sand transport vehicle must return to the repository construction site with the cargo bed empty after transporting the excavated soil and sand, while the waste transport vehicle must also transport waste to the landfill site. Must return to the waste location with the cargo bed empty. Therefore, in any case, the transport vehicle must travel one way with the cargo bed empty, which is not efficient and, as a result, the number of times the transport vehicle enters and leaves the waste disposal site increases. , Transport vehicles may cause pollution to the surrounding environment of the waste disposal site.

Therefore, the present invention has been made by paying attention to such a problem, and can be used as a waste disposal site at an early stage, and when the waste disposal site is constructed underground, the waste disposal site is constructed. It is not necessary to thicken the walls that make up the side walls of the to counter the pressure difference inside and outside the walls, and there is no problem of large-scale disposal of sediment, and the number of times a transport vehicle enters and leaves the waste disposal site is reduced. It is to provide a waste disposal site and a construction method thereof.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above objects, and its gist is to allow a subsidence wall that is planarly closed and to subside while vertically separating the inside of the underground wall. An upper and lower separating means, an excavating means for excavating sediment below the upper and lower separating means, and a sediment transporting means for discharging the excavated soil under the upper and lower separating means,
Excavating the bottom of the upper and lower separating means to discharge the earth and sand, sink the upper and lower separating means into the underground wall, and throw waste into the underground wall above the upper and lower separating means, The waste disposal site is characterized in that the pressure acting from inside and outside is balanced on the underground wall.

In the waste disposal site of the present invention, lining means may be provided on the ground above the underground wall.

[0008] In the waste disposal site of the present invention, the upper and lower isolation means provided so as to be able to sink while separating the inside of the underground wall from the upper and lower sides means that the waste is thrown above the upper and lower isolation means, and at the same time, the earth and sand below it. When excavating, the upper waste and the lower sediment and groundwater should be separated so that they do not invade each other, for example, they are formed with an outer peripheral dimension slightly smaller than the inner peripheral dimension of the underground wall. If it is a plate body, it can be submerged while vertically separating the inside of the underground wall. Here, the outer peripheral lower surface may be provided with a convex portion corresponding to the blade of the caisson on the plate body, whereby a space can be obtained on the lower surface of the plate body. Such a space can be used for running a heavy machine for excavation, which will be described later, as excavation means when excavating the lower side of the plate.

In the waste disposal site of the present invention, the excavating means for excavating earth and sand below the upper and lower separating means is, for example, a multi-axis auger fixed to the lower side of the plate when the upper and lower separating means is a plate. It may be a blind shield or a power shovel. Further, as described above, when the excavation work space is arranged below the vertical isolation means, the excavation means may be a heavy excavation machine such as a manned or unmanned backhoe.

In the waste disposal site of the present invention, the earth and sand conveying means is provided with a vertically communicating hole in the upper and lower separating means, and a concrete or steel pipe tubular body is provided in this hole to form a earth and sand conveying shaft. A vertical belt conveyer, a screw conveyer, a bucket that can be wound up and down by a winch, an air lift, or a suction pump may be provided on the earth and sand transport shaft.

Further, another gist of the present invention is that, in the first section, the underground wall that is planarly closed and the vertically separating means that is provided so as to be able to sink while vertically separating the inside of the underground wall. And a first excavation means for excavating earth and sand below the upper and lower separating means, and a earth and sand conveying means for discharging excavated earth and sand under the upper and lower separating means. In a plurality of compartments connected to one compartment, a waste disposal compartment having the same structure as the first waste disposal compartment is formed, and a passage space for communicating each of the plurality of connected waste disposal compartments with the ground. Is located at the waste disposal site.

In the waste disposal site of the present invention, lining means may be provided on the ground above the underground wall.

In the waste disposal site of the present invention, the plurality of sections connected to the first section are, for example, when the waste disposal site is composed of four rectangular plane sections, the first section is also A total of four sections may be adjacent to each other in two rows and two columns and arranged so that the overall planar outer shape is rectangular. Further, the first section and the plurality of sections connected to the first section may each be configured as a rectangular or a planar-shaped section other than a rectangular shape, and in this case, so as to surround the first section, Each of them may be a plurality of sections arranged circumferentially adjacent to the first section, or may be a plurality of sections arranged linearly on one side or both sides of the first section.

In the waste disposal site of the present invention, forming a waste disposal section having the same structure as the first waste disposal section in a plurality of sections connected to the first section means that the first waste disposal. The compartment and one or more of the plurality of compartments may have the same structure at the same time, and the plurality of compartments adjacent to the first waste disposal compartment are sequentially arranged one by one and have the same composition as the first waste disposal compartment. Also good.

In the waste disposal site of the present invention, each of the plurality of waste disposal sections connected to each other and the passage space communicating with the ground can be constructed by using, for example, a box culvert.

Further, another gist of the present invention is that an underground wall which is closed in a plane is formed, and an upper and lower separating means for vertically separating the inside of the underground wall is provided so as to be submerged, and below the upper and lower separating means. Excavating the soil to discharge the soil, sink the upper and lower isolation means into the underground wall, and throw a waste material into the underground wall above the upper and lower isolation means to externally enter the underground wall. A method for constructing a waste disposal site is characterized in that the pressure of the acting earth and sand or groundwater is balanced with the pressure from the underground wall.

In the method for constructing a waste disposal site of the present invention, a lining may be formed on the ground above the underground wall before or after the formation of the underground wall.

[0018]

According to the present invention, since the upper and lower separating means capable of vertically separating the inside and sinking are provided inside the underground wall which is two-dimensionally closed, the lower part of the upper and lower separating means is excavated to remove the earth and sand. The waste can be discharged and the upper and lower separating means can be sunk into the underground wall, and at the same time, the waste can be put into the underground wall above the upper and lower separating means. Therefore, inside the underground wall, earth and sand are constantly filled below the upper and lower separating means and waste is filled above the upper and lower separating means, and these fillings exert an internal pressure on the underground wall. This internal pressure can counteract the external pressure from the earth and sand around the ground wall and the groundwater, and eliminate the pressure difference between the inside and outside of the ground wall.

[0019]

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

FIG. 1 is a perspective view of a waste disposal site according to the present invention as set forth in claim 2, and an underground part around the waste disposal site is omitted for the sake of explanation. 2 is a line in FIG.
FIG. 3 is a sectional view taken along line II-II, and FIG. 3 is a line III-III in FIG.
It is sectional drawing along. The waste disposal site 1 of the present invention shown in FIGS. 1 to 3 is arranged in two rows and two columns so that the overall planar outer shape is rectangular. And the fourth waste disposal zone 10, 11, 12,
13 and a passage space 24 that connects the first, second, third, and fourth waste disposal sections 10, 11, 12, and 13 to the ground. Then, the first waste disposal section 10 has four underground walls 10a, 1 that are flatly closed.
0b, 10c, 10d, a sinking bottom slab 21 as an upper and lower isolation means provided inside the underground wall, and a backhoe 22 (see FIG. 4) as an excavating means for excavating sediment below the sinking bottom slab 21. A vertical belt conveyor 23 and a sediment transport shaft 24 as sediment transport means for discharging the soil excavated below the sinking bottom plate 21. Also,
Second, third and fourth waste disposal areas 11, 12, 13
Although not shown in FIGS. 1 to 3, it also has a configuration similar to that of the first waste disposal section 10.

The underground walls constituting the first, second, third and fourth waste disposal sections 10, 11, 12 and 13 may be shared by adjacent sections as shown in FIG. it can.
That is, the underground wall 10a of the first waste disposal section 10,
10d can be the same as the underground walls 13c and 11b of the fourth and second waste disposal sections 13 and 11, respectively,
Also, the underground walls 12b, 12 of the third waste disposal section 12
c can be made the same as the underground walls 13d and 11a of the fourth and second waste disposal sections 13 and 11, respectively, so that the four underground walls can be reduced. Therefore, when arranging multiple waste disposal areas,
Many underground walls can be reduced by arranging them so that the number of adjacent surfaces is maximized, as if the second, third, and fourth waste disposal areas were arranged adjacently in two rows and two columns. Therefore, the number of wall areas can be reduced as compared with the case where a plurality of sections are constructed without adjoining each other.

The passage space 24 is arranged around the entire first, second, third and fourth waste disposal sections so as to rotate the box culvert and is constructed in the ground near the ground surface. Two openings 10 ', 11', 12 ', 13' are formed on the surface facing the respective waste disposal areas, and one opening is used when the transport vehicle 35 throws in the waste. The other opening is used for excavating earth and sand.

The sinking bottom plate 21 is formed on a plate having an outer peripheral dimension slightly smaller than the inner peripheral dimension of the underground wall, and a convex portion 21 corresponding to a blade of a caisson is formed on the lower surface of the outer periphery of the plate.
a is provided, and a lubricant injection pipe 21b (see FIG. 5) that connects the plate side surface 21d and a lubricant pump (not shown) is provided inside the plate, and a thin steel plate or a resin sheet is used as a hanging shaft. As described above, the friction reducing sheet 21c (see FIG. 5) formed by being wound in the casing is provided on the plate side surface 21d. Here, the friction reducing sheet 21c is pulled out from the inside of the casing as the sinking bottom plate 21 sinks.
1 and the underground wall to reduce mutual wear, and together with the underground wall shields waste from groundwater. Also, from the lubricant injection pipe 21b, the plate side surface 21d
A lubricant is injected between the ground surface and the ground wall, whereby the side surface 21d of the plate body and the ground wall can be prevented from being worn away by the sand or the like sandwiched therebetween, and the friction reducing sheet 21c can be reduced. It is possible to finish the surface 21d on which is laid smooth.

The sediment carrying shaft 25 is used for the sinking bottom plate 2
1 extends from the hole formed in 1 to the opening 10 ′ of the passage space 24.
A vertical belt conveyor 23 is provided inside the. 1 to 3, the first waste disposal section 1
Although only the soil transport shaft 25 and the vertical belt conveyor 23 are shown for 0, they are similarly provided in the second, third and fourth waste disposal sections.

On the ground surface of each of the above-mentioned waste disposal sections, an artificial ground 26 having a large span is provided which does not require an intermediate support pile. As such artificial ground 26,
The artificial ground described in Japanese Patent Application Laid-Open No. 5-214821 filed by the applicant of the present application can be used, and the upper surface of the artificial ground has a soccer field, a rugby field, an athletic field, and a tennis competition, as in FIG. It may be used as a sports facility such as a field.

FIG. 4 is a partial cross-sectional perspective view of the waste disposal site of the present invention according to claim 1. The waste disposal site 2 of the present invention described in claim 1 has the same structure as one waste disposal section of the waste disposal site 1 described in claim 2. That is, the waste disposal site 2 has four underground walls 20 that are planarly closed, a subsidence slab 21 as an upper and lower isolation means, a backhoe 22 as an excavation means, and a vertical belt conveyor 23 as a sediment transport means. The earth and sand transport shaft 24 is provided as a main part. In addition to this main part, a passage space 24 that connects the inside of the underground wall 20 and the ground
And an artificial ground 26 provided on the passage space 24.

Next, the construction method of the waste disposal site of the present invention will be described with reference to FIG.

When constructing a waste disposal site underground, prevent the scattering of dust and the inflow of rainwater, and the above ground part is a sports facility such as a park, a soccer field, a rugby field, an athletic field, or a tennis field. When it is used as, etc., prior to the construction of a waste disposal site, the transport vehicles for waste and excavated earth and sand 35, 3
In order to construct the passage space 24 of No. 5, the box culvert is buried underground, and the artificial ground 26 is laid on the box culvert.

Next, the ground below the artificial ground 26 is excavated to the height of the lower end of the box culvert, and the underground wall 20 is constructed to a predetermined depth in a planarly closed arrangement.

After constructing the underground wall 20, this underground wall 20
A vertical anchor 27 (see FIG. 3) is placed on the ground surrounded by, the upper end is fixed to the artificial ground 26, and the lower end is made to reach the impermeable layer 32 of the ground, and the fixing portion 28 (see FIG. 3) is used. Fix it. The vertical anchor 27 is provided to be used as a reaction force member or a guide for forcibly sinking the sinking bottom slab 21 into the underground wall with a hydraulic jack (not shown) or the like. It may be omitted if the side friction is not a problem due to the type of waste, or if it is geologically easy to ensure settlement accuracy.

When the arrangement of the vertical anchors 27 is completed, the subsidence slab 21 is constructed below the artificial ground 26 so as to be able to subside in the underground wall. Where subsidence plate 21
A hydraulic jack (not shown) is provided below as a support for supporting the sinking bottom plate 21 and as a means for forcibly sinking the sinking bottom plate 21. The vertical anchor 27 is slidably provided so as to penetrate the sinking bottom plate 21. Further, a hole (not shown) is formed in the sinking bottom plate 21,
An earth / sand conveying shaft 24 is provided in this hole, and a vertical belt conveyor 23 is arranged inside the shaft. Furthermore, before and after the construction of the sinking bottom plate 21, a backhoe 22 is installed in a space below the sinking bottom plate 21. The vertical belt conveyor 2
3 or backhoe 22, if the ground is soft, a multi-axis auger (not shown) on the bottom surface of the sinking bottom plate 21
And an air lift or a sediment pump (not shown) may be provided inside the sediment transport shaft 24. When the ground is hard, a power shovel (not shown) is fixed to the lower surface of the sinking bottom plate 21. Winding up with a winch
A bucket (not shown) that can be freely lowered and a vertical belt conveyor 23 may be provided.

Next, under the sinking bottom plate 21, a backhoe 22
The vertical belt conveyor 23 conveys the excavated earth and sand to the passage space 24, discharges the excavated earth and sand to the buckets 33 and the like installed in the passage space 24, and sequentially conveys them to the ground by the conveyance vehicle 34.

When the lower part of the submerged bottom plate 21 is excavated to a predetermined depth, the submerged bottom plate 21 is forcibly submerged by a hydraulic jack while applying a reaction force to the vertical anchor 27, and the submerged bottom plate 21 does not tilt during subsidence. The submerged bottom plate 21 is submerged while the submerged bottom plate 21 is supported by the hydraulic jack as described above. Along with the sinking bottom plate 21 sinking, the friction reducing sheet 21c (see FIG. 5) is pulled out from the inside of the casing and is arranged between the sinking bottom plate 21 and the underground wall 20. Prior to the sinking of the sinking bottom slab 21, the lubricant is injected between the side surface of the sinking bottom slab 21 and the underground wall 20 via the lubricant filling pipe 21b.

Settling the bottom plate 21 by a predetermined depth,
When a space for loading the waste 30 is formed above the sinking bottom plate 21, the waste is loaded by the transport vehicle 35 through the passage space 24 and the loading is started. At this time, sinking bottom plate 2
The waste 30 above 1 is spread by a small bulldozer 36 or the like.

The above-described steps of excavation below the sinking bottom plate 21, sinking of the sinking bottom plate 21 and throwing wastes above the sinking bottom plate 21 are simultaneously or sequentially repeated and landfilled with the waste 30. Perform. When the subsidence slab 21 reaches the impermeable layer 32, the hydraulic jack below the subsidence slab 21 is removed, and the backhoe 22 is lifted to the same height as the passage space 24 with a winch or the like (not shown) through the earth and sand transport shaft 25, Transport it to the ground.

Further, if necessary, concrete is filled under the settling bottom slab 24 that has reached the impermeable layer 32 through the earth and sand transport shaft 25.

By constructing a plurality of waste disposal areas sequentially or simultaneously by such a waste disposal area construction method, a waste disposal area having a plurality of waste disposal areas according to claim 2 is also constructed. be able to.

[0038]

As described above, according to the present invention, since the vertically separating means capable of vertically separating and sinking is provided inside the underground wall which is planarly closed, the conventional underground buried type waste disposal. Even if it is not after completely forming a hollow shaft space by walls like a place, excavation below the vertical isolation means to discharge the earth and sand and at the same time into the underground wall above the vertical isolation means. Waste can be input. Therefore, it is possible to accelerate the start of use as a waste disposal site.
In addition, the soil and / or waste of the ground is always filled inside the underground wall, and the internal pressure on the underground wall due to this filling causes the external pressure from the soil and groundwater around the ground wall. Since it is balanced with, it can be formed thinner than the underground wall of a conventional underground buried waste disposal site.

Further, in the present invention, since the excavation of the vertical shaft space and the dumping of the waste are performed at the same time, the transport vehicle transports the waste to the disposal site, and then transports the excavated earth and sand on the empty loading platform. Therefore, it is possible to reduce the number of times the transport vehicle goes in and out of the waste disposal site, and since the transport vehicle passes through the underground passage, it is possible to prevent pollution of the environment surrounding the waste disposal site by the transport vehicle.

Furthermore, the disposal of a large amount of earth and sand generated during excavation, unlike the conventional underground buried waste disposal site, does not pose a problem. Furthermore, in the present invention, a reliable water leakage preventing effect can be obtained by placing the friction reducing sheet at the time of use and placing the friction reducing sheet and the concrete under the bottom slab after use.

[Brief description of drawings]

FIG. 1 is a perspective view of a waste disposal site according to claim 2 of the present invention.

2 is a cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a partial cross-sectional perspective view of the waste disposal site according to claim 1 of the present invention.

FIG. 5 is a partially enlarged cross-sectional view of a sinking bottom plate as an upper and lower separating means of the present invention.

[Explanation of symbols]

 1, 2 waste disposal site 10 1st waste disposal section 10a, 10b, 10c, 10d underground wall 11 2nd waste disposal section 11a, 11b, 11c, 11d underground wall 12 3rd waste disposal Sections 12a, 12b, 12c, 12d Underground wall 13 Fourth waste disposal section 13a, 13b, 13c, 13d Underground wall 20 Underground wall 21 Subsidence plate (upper and lower isolation means) 22 Backhoe (excavation means) 23 Vertical conveyor (Sediment transport means) 24 Passage space 25 Sediment transport shaft (sediment transport means) 26 Artificial ground (lining) 30 Waste

Claims (5)

[Claims] 1. An underground wall that is planarly closed, an up-and-down isolation means provided so as to be able to sink while vertically separating the interior of the underground wall, and an excavation means for excavating earth and sand below the up-down isolation means. And a earth and sand conveying means for discharging the earth and sand excavated below the upper and lower separating means, the lower part of the upper and lower separating means is excavated to discharge the earth and sand, and the upper and lower separating means sinks into the underground wall. At the same time, the waste is thrown into the underground wall above the upper and lower isolation means to balance the pressure acting on the underground wall from inside and outside. 2. In the first section, a ground wall that is planarly closed, a vertical isolation means that is submerged while vertically separating the interior of the underground wall, and a lower side of the vertical isolation means. To form a first waste disposal section including excavation means for excavating sediment and earth and sand transporting means for discharging the excavated sediment under the upper and lower isolation means, and a plurality of multiple wastes connected to the first division A waste disposal site, wherein a waste disposal section having the same configuration as the first waste disposal section is formed in the section, and a passage space is provided that connects each of the plurality of connected waste disposal sections to the ground. 3. The waste disposal site according to claim 1 or 2, further comprising lining means on the ground above the underground wall. 4. An underground wall that is planarly closed is formed, and a vertical isolation means that vertically isolates the interior of the underground wall is provided so as to be submerged, and the bottom of the vertical isolation means is excavated to discharge earth and sand. Then, while lowering the upper and lower isolation means into the underground wall,
Disposing wastes above the upper and lower isolation means to balance the pressure of earth and sand or groundwater acting on the underground wall from the outside with the pressure from inside the underground wall. How to build a place. 5. The method for constructing a waste disposal site according to claim 4, wherein a lining is formed on the ground above the underground wall before and after the formation of the underground wall.