JPH10151426A - Water interception structure in waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water interception structure in a waste disposal site in which even when heavy machinery is traveled and circled in the upper part, the water interception structure strongly supports load thereof and easily avoids being damaged by deflection and torsion and also even when subsidence due to compression, compaction and decomposition or the like is caused in waste, the water interception structure is not retreated thereby and damaged. SOLUTION: A water interception structure 10 is installed in the bottom of a waste disposal site 11 to prevent sewage from being leaked from the inside of the disposal site 11 to the ground of the circumference. The water interception structure 10 consists of lower layer watertight asphalt 12 which covers the ground 20 of the bottom and is laid, a water permeable asphalt layer 13 provided on the upper face of the lower layer watertight asphalt 12 and upper layer watertight asphalt 14 which covers the upper face of the water permeable asphalt layer 13 and is formed. Further, the water permeable asphalt layer 13 is partitioned into a plurality of compartments 17 by partition weirs 15 and also monitoring pipes are provided in the respective compartments 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water impervious structure in a waste disposal site, and more particularly, it is installed on the bottom ground of a waste disposal site to prevent leakage of sewage from inside the disposal site to the surrounding ground. This is related to the impermeable structure at the waste disposal site for prevention.

[0002]

2. Description of the Related Art For example, landfill-type waste disposal sites for dumping industrial waste and general waste are disposed in a concave ground formed by utilizing natural terrain or excavating the ground. Although it is landfilled and stored, in order to prevent environmental pollution due to the infiltration of sewage leached from landfilled wastewater into the ground, it is mandatory to implement a water barrier in advance on the bottom ground of the disposal site.

[0003] As such a water-blocking work, conventionally, a method of laying a soft synthetic resin-based or rubber-based water-blocking sheet is known from the viewpoint of economy and water-blocking.

[0004] Further, in order to strengthen the water-blocking structure using such a water-blocking sheet and to more reliably prevent leakage of wastewater,
Drainage material is appropriately sandwiched between the water-impervious sheet and the double-layered water-impervious sheet, or such a double-structured water-impervious sheet is divided into a plurality of sections, and a leak detection pipe is provided in each section. By suctioning the sewage through the leak detection tube, it is possible to detect the leakage of the sewage or the breakage of the impermeable sheet, and to detect the damage by injecting and solidifying the injection material through the leak detection tube. It is known to repair a damaged section.

[0005]

However, according to the water-blocking structure constituted by the above-mentioned conventional water-blocking sheet,
Since the impermeable sheet was thin with a thickness of several mm, the bottom ground of the waste disposal site where the impermeable sheet was laid was not stable due to softness or unevenness. In this case, if heavy equipment such as bulldozers and dump trucks is run or turned to spread the discarded waste, etc., above it, the weight of the waste, heavy equipment, etc. causes the impermeable sheet to bend or twist. In addition, there is a problem that the water-impervious sheet is drawn in and easily damaged due to settlement due to compression, consolidation, decomposition, and the like of the waste as well as being easily damaged.

Further, since the water-shielding sheet is difficult to adhere to a drainage material such as a non-woven fabric or a protective material such as protective sand laid above and below the water-shielding sheet, the sheets are not integrated but independent. Therefore, especially on the slope, the protection material is easily blown off by the wind and the water-impervious sheet is exposed, so it is likely to be degraded by solar radiation or easily damaged by crows or other external forces. was there.

Therefore, the present invention has been made in view of the above-mentioned conventional problems. Even when a heavy machine is run or turned upward in order to spread the waste, protective sand, and the like, these loads can be strengthened. To prevent damage due to bending or twisting, and even if the waste is settled due to compression, compaction, decomposition, etc., it will not be drawn in and damaged by this. The purpose is to provide a water-blocking structure at the disposal site.

It is another object of the present invention to provide a water shielding structure in a waste disposal site which is hardly deteriorated even when exposed, and is hardly damaged by external force.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and its gist is that it is installed on the bottom ground of a waste disposal site and extends from the inside of the disposal site to the surrounding ground. A water-blocking structure for preventing sewage from leaking, asphalt laid over the bottom ground,
A lower impermeable layer made of a pavement material such as concrete, a drainage layer provided on the upper surface of the lower impermeable layer, and an upper impermeable layer formed over the upper surface of the drainage layer. In a water-blocking structure at a waste disposal site.

The drainage layer may be sand or quarry as long as it has a compression stiffness that does not cause deformation due to the overload of waste or heavy equipment, and a water permeability that allows the passage of groundwater or leaked sewage. Etc. and JP-A-8-19
A hard thread made of synthetic resin such as polypropylene, nylon, polyethylene and pinyl chloride as a core material constituting a construction drainage material described in No. 9548 was entangled in a loofah shape and three-dimensionally molded to a predetermined thickness. Although a plate material or the like can be used, it is particularly preferable to form the drainage layer with water-permeable asphalt.

The upper water-impervious layer can be provided by using various materials such as a water-blocking sheet as long as the material has watertightness. In particular, a pavement material such as asphalt or concrete is used. It is preferable to form it.

[0012] According to the impermeable structure in the waste disposal site of the present invention, it is preferable that the drainage layer is partitioned into a plurality of sections by a partition wall.

Further, one end of a water leak detection pipe is disposed in each of the plurality of compartments, and the other end of the water leak detection pipe is formed at a depth reaching the bottom of the waste disposal site. By communicating with the management pit and inspecting the quality of the water flowing into the management pit via the water leak detection pipe, the presence or absence of water leak into each section can be detected.

Further, the plurality of sections are partitioned in a state where they are communicated with the ground by partition walls extending in parallel in the same direction, and each section is provided at least from the ground to the bottom of the waste disposal site. A perforated pipe for detecting water leakage, which has a pore water pressure gauge therein, which extends to a maximum depth may be provided.

According to the water-impervious structure of the waste disposal site of the present invention, the lower impermeable layer laid over the bottom ground is made of a water-tight pavement material such as asphalt, concrete or the like. It has excellent durability and supports the load on the bottom ground even when the bottom ground is soft or the bottom ground is uneven, by dispersing the load caused by waste and heavy equipment over a wide range. In addition, since the rigidity hardly deforms, even if the waste is settled by compression, compaction, decomposition, or the like, the waste is not drawn in and settled.

The drainage layer interposed between the lower water-impermeable layer and the upper water-impermeable layer acts as a protective layer or a buffer layer for the lower water-impervious layer, thereby dispersing a load from above and distributing the lower water-impervious layer. It can be transmitted to the water-permeable layer, which makes it possible to further improve the durability and stability of the lower water-impermeable layer.

Further, the upper water-impermeable layer can be easily laid in a stable state above the lower water-impermeable layer and the drainage layer, which have considerable strength and less unevenness, and
In addition, with the lower water-impervious layer, it exhibits a double waterproof function,
Even if one of them is damaged, it is possible to easily maintain the water shielding of the water shielding structure.

If the drainage layer is made of water-permeable asphalt, it can be easily integrated with the lower water-impermeable layer by adhesion, and its superior strength and durability can reduce a load from above. It can be transmitted to the lower impermeable layer in a stable state.

Further, the upper impermeable layer is made of asphalt,
If it is made of pavement material such as concrete, its excellent strength and durability will allow the load from above to be transmitted to the lower impermeable layer in a stable state, and will also prevent deterioration due to solar radiation and damage due to crows etc. Will not occur.

Further, in the water shielding structure according to the present invention, if the drainage layer is divided into a plurality of sections by a partition wall,
Even when the upper impermeable layer is damaged and the sewage flows into the drainage layer, the permeation area of the sewage can be kept only in the compartment.

Furthermore, one end of a water leak detection pipe is arranged in a plurality of sections, and the other end of the water leak detection pipe is formed to a depth reaching the bottom of the waste disposal site. If it communicates with the management pit, it is possible to easily inspect the water quality in each section by collecting the water in each section in the management pit by natural flow.

On the other hand, a plurality of sections are partitioned in a state where they are communicated with the ground by partition walls extending in parallel in the same direction, and each section has at least a depth extending from the ground to the bottom of the waste disposal site. If a perforated pipe for water leakage detection having a pore water pressure gauge is provided inside, it is possible to detect fluctuations in water pressure and easily detect the presence or absence of water leakage to each section. By injecting the injection material through the perforated tube for detecting water leakage, it is possible to easily repair the section where the water leakage has occurred.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention, that is, embodiments, will be described below in detail with reference to the accompanying drawings. As shown in FIG. 1, a water-blocking structure 10 according to a first embodiment of the present invention includes, as an example, a waste disposal site 11 formed by excavating and leveling a vast site in a mountainous area or the like in a concave shape. Bottom ground 20 including slope
As shown in FIGS. 2 and 3 in an enlarged manner, a lower watertight asphalt 12 as a lower impermeable layer laid over the bottom ground 20,
A water-permeable asphalt layer 13 as a drainage layer provided on the upper surface of the lower water-tight asphalt 12 and an upper water-tight asphalt 14 as an upper impermeable layer formed over the water-permeable asphalt layer 13. It has a layered structure.

The lower watertight asphalt 12 is
It can be formed by using various known asphalt mixtures which are generally used for asphalt concrete pavement and which are blended so as to have water tightness. For example, on a base 19 formed by laying quarries or the like on the bottom ground 20. The asphalt mixture can be easily formed by spreading the asphalt mixture to a thickness of, for example, about 5 cm and rolling it using various machines used for pavement work.

The permeable asphalt layer 13 is used, for example, for a well-known drainage pavement.
The asphalt mixture can be formed using an asphalt mixture blended to be about 10 ^-2 cm / s, and the asphalt mixture can be formed on the lower watertight asphalt 12 by using various machines used for paving work. For example, it can be easily formed by laying down to a thickness of about 5 cm and rolling uniformly.

Further, the upper watertight asphalt 14 is
Similar to the lower water-tight asphalt 12, it can be formed using various known asphalt mixtures that are commonly used for asphalt concrete pavement and that are formulated to have water-tightness. The asphalt mixture can be easily formed by spreading the asphalt mixture to a thickness of, for example, about 5 cm and rolling it using various machines used for paving work.

According to the thus formed water-blocking structure 10 as a three-layered asphalt structure, the lower water-tight asphalt 12 and the water-permeable asphalt layer 13 having considerable strength and durability. The upper watertight asphalt 14 and the upper watertight asphalt 14 are fixed to each other and integrated, thereby exhibiting greater strength and durability, and the middle water-permeable asphalt layer 13 functions as a buffer layer. The lower watertight asphalt 12 and the upper watertight asphalt 1
4 can be effectively prevented.

Further, according to the water shielding structure 10 of the first embodiment, the water permeable asphalt layer 1 interposed between the lower watertight asphalt 12 and the upper watertight asphalt 14.
3 is vertically and horizontally partitioned by a partition wall 15 into a plurality of sections 17, and one end of a monitoring pipe 16 as a leak detection pipe is arranged in each section 17.

Here, the partition wall 15 is made of watertight asphalt and is erected at a height of about 5 cm corresponding to the thickness of the permeable asphalt layer 13, and the permeable asphalt layer 13 is, for example, about 20 m × 20 m. , And can easily block outflow of groundwater or sewage from the section 17 to the adjacent section 17.

The monitoring tube 16 is made of, for example, a cylindrical tube made of vinyl chloride or stainless steel having a diameter of about 25 mm. It is constructed as a perforated pipe, and is extended so as to penetrate the partition wall 15 (see FIG. 4), and the other end is, as shown in FIG. 21 is communicated with the management pits 18 formed at a depth reaching 21, and the quality of water flowing into the management pits 18 through the monitoring pipe 16 by natural flow is checked to determine whether or not water leaks into each section 17. Is detected, and a section in which water has leaked due to breakage of the upper watertight asphalt 14 can be easily specified.

Further, each of the monitoring pipes 16 communicating with the management pit 18 is connected to an injection pump for feeding a hardening injection material, for example, of a cement type or a resin type, at the management pit 18. Compartment 17 that has been damaged by this infusion pump.
By injecting and solidifying the injection material, the damaged section 17 can be easily repaired.

The partition wall 15 and the monitoring pipe 16 are, as shown in FIG.
After arranging the permeable asphalt layer 13, the permeable asphalt layer 13 can be easily provided inside the permeable asphalt layer 13 by arranging the permeable asphalt layer 13 before laying and installing the permeable asphalt layer 13.

In FIG. 4, each section 17 is provided with two monitoring pipes 16 each having a distal end portion. One of the monitoring pipes 16 has an opening at a high position in each section 17. Also serves as an air vent when the injection material is pumped into each section 17 through the other monitoring pipe 16. That is, when the injection material is pressure-fed, the injection material is filled from a low position due to its heavy weight, and is partitioned from the monitoring pipe 16 opening at a high position.
The inside of the section 17 is filled while expelling the air and water in the section 7. Therefore, by confirming that the injection material comes out from the monitoring tube 16 whose tip portion is opened at a high position, it is possible to confirm that the injection material is sufficiently filled in the compartment 17. In addition, when the repair by the injection of the injection material is not performed only by the detection of the water leakage, one end portion of the monitoring pipe 16 may be provided in each section 17.

According to the water-blocking structure 10 of the first embodiment having the above-described structure, the lower water-tight asphalt 12, the water-permeable asphalt layer 13, and the upper water-tight asphalt 14 have strength and durability. When running or turning heavy equipment such as dump trucks, bulldozers, backhoes, etc., in order to spread and compress the protective material 22 and wastes 23 placed above them, because of their superiority. However, the possibility of damage is extremely reduced, and even if the waste 23 sinks due to compression, consolidation, decomposition, or the like, this prevents the waste 23 from being pulled in.

Further, even when the water-blocking structure 10 is exposed on a slope or the like before being covered with the waste 23 (see FIG. 1), the water-blocking structure 10 may be deteriorated by sunlight due to its excellent strength and durability. Damage to the water-blocking structure 10 due to crows or other external forces can be easily avoided.

FIGS. 6 and 7 show a water shielding structure 30 according to a second embodiment of the present invention. That is,
The water shielding structure 30 of the second embodiment has a lower water-tight asphalt 32 as a lower water-impermeable layer and a drainage layer provided on the upper surface of the lower water-tight asphalt 32 as in the first embodiment. Of a water-permeable asphalt layer 33 and an upper water-tight asphalt 34 as an upper water-impermeable layer formed over the water-permeable asphalt layer 33. The partition wall 35 is made of a watertight asphalt extending in parallel in the same direction, and is divided into a number of parallel vertically long sections 37 partitioned in a state of communicating with the ground.

Each section 37 has a perforated pipe for monitoring as a perforated pipe for leak detection, which has a pore pressure gauge inside and extends to a depth from the ground to the bottom 21 of the waste disposal site 11. 38 are provided.

According to the water-blocking structure 30 of the second embodiment, similarly to the water-blocking structure 30 of the first embodiment, the lower water-tight asphalt 32 and the water-permeable asphalt having considerable strength and durability are provided. Layer 33 and upper watertight asphalt 3
4 are integrated to exhibit high strength and durability, and the intermediate water-permeable asphalt layer 33 functions as a buffer layer, and the lower watertight asphalt 32 and the upper watertight Asphalt 3
4 can be effectively prevented.

Further, the possibility of damage by a heavy machine traveling or turning upward is extremely reduced, and even when the waste 23 sinks due to compression, consolidation, decomposition or the like, the waste 23 is prevented from being trapped by this and can be shielded. Even when the water structure 30 is exposed, it is possible to easily prevent the water structure 30 from being deteriorated by solar radiation or damaged by crows or other external forces.

Further, the fluctuation of the water pressure can be detected by the pore water pressure gauge arranged in the perforated pipe 38 for monitoring, and the presence or absence of water leakage to each section 37 can be easily detected. Perforated pipe 38 for monitoring detected
Is connected to an infusion pump, and the infused solidified material is injected into the infusion pump. The infused solidified material is injected into the entirety of the section 37 where the breakage has been detected through a large number of holes formed in the perforated pipe 38 for monitoring. It becomes possible to easily inject and fill.

It should be noted that the present invention is not limited to the embodiments of the above-described embodiments, but can be variously modified and adopted within the scope of the structure described in each claim. For example, the drainage layer does not necessarily need to be formed of water-permeable asphalt, and the upper water-impermeable layer can be formed using, for example, a water-blocking sheet.

Further, the presence or absence of water leakage into each section of the drainage layer can be detected by an electric method or by vacuum suctioning each of the partitioned sections. There is no need to divide into compartments.

[0043]

As described above in detail, according to the water impermeable structure in the waste disposal site of the present invention, the lower impermeable layer made of pavement material such as asphalt and concrete laid over the bottom ground is provided. A drainage layer provided on the upper surface of the lower water-impervious layer, and an upper water-impervious layer formed over the upper surface of the drainage layer. Therefore, even when the heavy equipment is run or turned upward to spread the waste, protective sand, etc., these loads are strongly supported, and breakage due to bending or twisting can be easily avoided. In addition, even when the waste is settled due to compression, compaction, decomposition, or the like, the waste is hardly damaged, and even when the waste is exposed, deterioration and damage due to external force can be easily avoided.

Therefore, leakage of wastewater from the waste disposal site to the surrounding ground can be reliably and stably prevented.

In addition, if the drainage layer is divided into a plurality of sections by partition walls, and a leak detection pipe or a perforated pipe is provided in each section, the section in which water has leaked due to breakage can be easily specified. At the same time, the damaged section can be easily repaired.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating a waste disposal site employing a water-blocking structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A of FIG. 1 showing a configuration of a water shielding structure according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a perspective view showing an example of the arrangement of partition walls and water leakage detection pipes.

FIG. 5 is a schematic cross-sectional view showing a situation in which a water leakage detection pipe is provided so as to communicate with a management pit.

FIG. 6 is a schematic cross-sectional view illustrating a waste disposal site employing a water-blocking structure according to a second embodiment of the present invention.

FIG. 7 is a top view taken along the line CC of FIG. 6 for explaining the arrangement of partition walls and perforated pipes for detecting water leakage.

[Explanation of symbols]

 10, 30 impermeable structure 11 waste disposal site 12, 32 lower watertight asphalt (lower impervious layer) 13, 33 permeable asphalt layer (drainage layer) 14, 34 upper watertight asphalt (upper impermeable layer) 15, 35 Partition ridge 16 Monitoring pipe (Pipe for water leakage detection) 17,37 Section 18 Management pit 20 Bottom ground 21 Bottom part 38 Perforated pipe for monitoring (Perforated pipe for water leakage detection)

Claims (6)

[Claims] Claims: 1. Installed on the bottom ground of a waste disposal site,
A water-impervious structure for preventing sewage from leaking from the inside of the disposal site to the surrounding ground, asphalt laid over the bottom ground, a lower impermeable layer made of a pavement material such as concrete, An impermeable structure in a waste disposal site, comprising: a drainage layer provided on an upper surface of the lower impermeable layer; and an upper impermeable layer formed over the upper surface of the drainage layer. 2. The impermeable structure in a waste disposal site according to claim 1, wherein the drainage layer is made of permeable asphalt. 3. The impermeable structure in a waste disposal site according to claim 1, wherein the upper impermeable layer is made of a pavement material such as asphalt or concrete. 4. The impermeable structure in a waste disposal site according to claim 1, wherein the drainage layer is divided into a plurality of sections by a partition embankment. 5. An end of a water leakage detection pipe is disposed in each of the plurality of compartments, and the other end of the water leakage detection pipe is formed at a depth reaching a bottom surface of the waste disposal site. The presence or absence of water leaking into each section is detected by communicating with the management pit thus set and inspecting the quality of water flowing into the management pit via the water leak detection pipe. Impermeable structure at a waste disposal site. 6. The plurality of sections are partitioned in a state where they are communicated with the ground by partition walls extending in parallel in the same direction, and each section has at least a bottom surface of the waste disposal site from the ground. 5. The water shielding structure in a waste disposal site according to claim 4, wherein a perforated pipe for leak detection having a pore water pressure gauge therein is provided extending to a maximum depth.