JP3709633B2 - Impervious structure in waste disposal site - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-impervious structure in a waste disposal site, and in particular, disposed of at the bottom of the waste disposal site to prevent sewage from leaking from the inside of the disposal site to the surrounding ground. It relates to the water-impervious structure at the site.
[0002]
[Prior art]
For example, a landfill-type waste disposal site that dumps industrial waste and general waste stores landfill in a concave ground created by using natural terrain or excavating the ground. However, in order to prevent environmental pollution due to underground infiltration of sewage leached from landfilled waste, it is obliged to implement a water shielding work in advance on the bottom ground of the disposal site.
[0003]
As such a water-impervious construction, one that has been conventionally performed by laying a soft synthetic resin-based or rubber-based water-impervious sheet is known from the viewpoint of economical efficiency and water shielding.
[0004]
In addition, in order to strengthen the water-blocking structure with such a water-blocking sheet and to prevent leakage of sewage more reliably, drainage materials are sandwiched as appropriate, and the water-blocking sheet is laid in double, A double-layered water-impervious sheet is divided into a plurality of compartments, and a water leak detector pipe is provided in each compartment, and sewage is sucked through the water leak detector pipe, thereby leaking sewage or In addition to detecting the presence or absence of breakage, it is known to repair a section where breakage is detected by injecting and solidifying the injected material through the water leakage detection tube.
[0005]
[Problems to be solved by the invention]
However, according to the water-impervious structure constituted by the conventional water-impervious sheet, the water-impervious sheet is thin with a thickness of about several millimeters. If the bottom of the ground is soft or not stable due to unevenness, run heavy machines such as bulldozers and dump trucks to spread the dumped waste and so on. In addition, the weight of the water-impervious sheet is likely to be bent and twisted due to the weight of waste or heavy machinery, etc., and the water-impervious sheet is easily damaged due to the subsidence caused by compression, compaction, or decomposition of the waste. There was a problem of being easy to do.
[0006]
In addition, the water shielding sheets are difficult to be fixed to drainage materials such as nonwoven fabrics and protective materials such as protective sand, which are laid above and below them, so that they are not integrated into independent layers. Therefore, particularly in the slope, there is a problem that the protective material is easily blown away by the wind and the water shielding sheet is exposed, so that it is deteriorated by solar radiation or easily damaged by crows or other external forces. .
[0007]
Therefore, the present invention has been made paying attention to the above-mentioned conventional problems, and even when heavy equipment is run or swung upward to spread waste and protective sand, etc., these loads are firmly supported. In the waste disposal site, it can be easily avoided from being damaged by bending or twisting, and even if the waste sinks due to compression, compaction, decomposition, etc., it will not be pulled and damaged by this The object is to provide a water shielding structure.
[0008]
Another object of the present invention is to provide a water shielding structure in a waste disposal site that is not easily deteriorated and is not easily damaged by an external force even in an exposed state.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following means.
That is, the invention according to claim 1 is a water-impervious structure which is installed on the bottom ground of a waste disposal site and prevents leakage of sewage from the inside of the disposal site to the surrounding ground, wherein the bottom portion It consists of a lower water-impervious layer composed of an asphalt mixture blended so as to have water-tightness and laid over the ground, and an asphalt mixture blended so as to have water permeability provided on the upper surface of the lower-layer impermeable layer. A drainage layer, and an upper impermeable layer made of an asphalt mixture blended so as to have watertightness, formed to cover the upper surface of the drainage layer, the lower impermeable layer, the drainage layer, and the upper impermeable layer These asphalt mixtures are fixed to each other and integrated .
[0010]
According to the water-impervious structure in the waste disposal site according to the present invention, a lower-layer impermeable layer made of an asphalt mixture blended so as to have water-tightness and laid over the bottom ground, and an upper surface of the lower-layer impermeable layer A drainage layer made of an asphalt mixture formulated so as to have water permeability, and a lower water-impermeable layer made of an asphalt mixture formulated so as to have water-tightness formed so as to cover the upper surface of the drainage layer. A water shielding structure can be constituted by an asphalt structure having a three-layer structure. In this case, the lower water-impervious layer, the drainage layer, and the lower water-impervious layer each have an asphalt mixture, so that the common asphalt mixture can be fixed and integrated with each other, and the entire impermeable structure As a result, the strength and durability can be greatly increased.
Therefore, the load from waste and heavy machinery can be supported by the bottom ground while widely dispersing, so even if the bottom ground is soft or uneven, the top load is firmly supported with almost no deformation. can do. As a result, even if a heavy machine is run or swiveled to spread waste and protective sand, it will not bend or break, and the waste will be compressed or consolidated. Even if subsidence due to decomposition or the like occurs, it is possible to continue to maintain stable water shielding performance without being pulled and damaged by them.
[0011]
In addition, since the drainage layer interposed between the lower impermeable layer and the upper impermeable layer can function as a protective layer or a buffer layer for the lower impermeable layer, the load from above is dispersed to lower the impermeable layer It can be transmitted to the layer, and the durability and stability of the lower impermeable layer can be improved.
[0012]
Furthermore, since the lower water-impervious layer and the upper water-impermeable layer can exert a double water-impervious function, even if one breaks, the water-impervious structure as a whole is not impaired, It can continue to maintain a stable water barrier.
[0013]
Furthermore, even if the upper impermeable layer is exposed, it is not deteriorated by solar radiation or damaged by wild birds such as crows, and the function as the upper impermeable layer can be maintained.
[0014]
The invention according to claim 2 is a water-impervious structure in the waste disposal site according to claim 1, wherein the drainage layer is partitioned into a plurality of sections by a partition.
[0015]
According to the water-impervious structure in the waste disposal site according to the present invention, 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 in the compartment.
[0016]
The invention according to claim 3 is the water shielding structure in the waste disposal site according to claim 2, wherein one end of a water leakage detection pipe is disposed in the plurality of sections, and the water leakage detection The other end of the pipe communicates with a management pit formed at a depth reaching the bottom part of the waste disposal site, and by inspecting the water quality flowing into the management pit via this water leakage detection pipe, It is characterized by detecting the presence or absence of water leakage to each section.
[0017]
According to the water shielding structure in the waste disposal site according to the present invention, the water quality in each section can be easily inspected by collecting the water in each section in the management pit by natural flow.
[0018]
The invention according to claim 4 is the water-impervious structure in the waste disposal site according to claim 2, wherein the plurality of sections communicate with the ground by partitioning partitions extending in parallel in the same direction. Each partition is provided with a perforated pipe for water leakage detection having a pore water pressure gauge inside and extending to at least a depth from the ground to the bottom surface of the waste disposal site. And
[0019]
According to the water-impervious structure in the waste disposal site according to the present invention, it is possible to easily detect the presence or absence of water leakage to each section by detecting fluctuations in the water pressure, and to introduce the injection material through the perforated pipe for water leakage detection. By injecting, it becomes possible to easily repair a section where water leakage has occurred.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention, that is, examples will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the water-impervious structure 10 according to the first embodiment of the present invention is an example of a waste disposal site 11 created by excavating a vast site in a mountainous area or the like into a concave shape and leveling as an example. As shown in FIG. 2 and FIG. 3, the lower-layer watertight asphalt as a lower-layer impermeable layer laid so as to cover the bottom ground 20 is provided so as to cover the bottom ground 20 including the slope. 12, a water-permeable asphalt layer 13 as a drainage layer provided on the upper surface of the lower-layer water-tight asphalt 12, and an upper-layer water-tight asphalt 14 as an upper impermeable layer formed so as to cover the water-permeable asphalt layer 13 It has a three-layer structure consisting of
[0024]
And the lower layer water-tight asphalt 12 can be formed using the various well-known asphalt mixture mix | blended so that it may be equipped with the water-tightness generally used for asphalt concrete pavement, for example, quarrying etc. on the bottom ground 20 The asphalt mixture can be easily formed on the roadbed 19 by laying the asphalt mixture to a thickness of about 5 cm, for example, and using various machines used for paving work.
[0025]
Moreover, the water-permeable asphalt layer 13 can be formed using the asphalt mixture mix | blended so that a water-permeability coefficient may be set to about 1 * 10 ^<-2 > cm / s, for example used for a well-known drainage pavement, for example. The asphalt mixture can be easily formed on the lower-layer watertight asphalt 12 by using various machines used for paving work and spreading the asphalt mixture to a thickness of, for example, about 5 cm.
[0026]
Further, the upper layer watertight asphalt 14 can be formed using various known asphalt mixtures formulated to have water tightness, which is generally used for asphalt concrete pavement, similarly to the lower layer watertight asphalt 12. The asphalt mixture can be easily formed on the water-permeable asphalt layer 13 by using various machines used for pavement work and spreading the asphalt mixture to a thickness of, for example, about 5 cm.
[0027]
And according to the water-impervious structure 10 as a three-layer structure asphalt structure formed in this way, the lower layer water-tight asphalt 12, the permeable asphalt layer 13, and the upper layer water-tightness having considerable strength and durability. As the asphalt 14 is fixed and integrated with each other, the strength and durability of the asphalt 14 can be further enhanced, and the intermediate water-permeable asphalt layer 13 can function as a buffer layer. This makes it possible to effectively prevent the lower layer watertight asphalt 12 and the upper layer watertight asphalt 14 from being damaged by the load from the upper side.
[0028]
Further, according to the water-impervious structure 10 of the first embodiment, the water-permeable asphalt layer 13 interposed between the lower layer water-tight asphalt 12 and the upper layer water-tight asphalt 14 is divided into a plurality of sections 17 by the partition wall 15. In addition to being partitioned vertically and horizontally, each section 17 is provided with one end of a monitoring pipe 16 serving as a water leakage detection pipe.
[0029]
Here, the partition wall 15 is made of water-tight asphalt, raised to a height of about 5 cm that matches the thickness of the water-permeable asphalt layer 13, and the water-permeable asphalt layer 13 has a size of about 20 m × 20 m, for example. It is possible to easily block the groundwater and sewage from flowing out from the section 17 to the adjacent section 17.
[0030]
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, and the tip portion to be arranged in each section 17 has a hole with a large number of holes around it. It is configured as a pipe and is extended so as to penetrate the partition wall 15 (see FIG. 4), and the other end reaches the bottom surface portion 21 of the waste disposal site 11 as shown in FIG. The presence or absence of water leakage to each section 17 is detected by communicating with the management pits 18 formed in the depth and checking the quality of water flowing into the management pits 18 by natural flow through the monitoring pipe 16. At the same time, it is possible to easily identify the section where water leakage has occurred due to the damage of the upper watertight asphalt 14.
[0031]
Further, each monitoring pipe 16 communicating with the management pit 18 can be connected to an injection pump for feeding, for example, cement-based or resin-based injection material having a curing property in the management pit 18. Thus, by injecting and solidifying the injection material into the damaged section 17 by the injection pump, the damaged section 17 can be easily repaired.
[0032]
As shown in FIG. 4, the partition wall 15 and the monitoring pipe 16 are disposed after the lower water-tight asphalt 12 is provided and before the water-permeable asphalt layer 13 is laid and installed, and then the water-permeable asphalt layer 13. Can be easily provided inside the water-permeable asphalt layer 13.
[0033]
Further, in FIG. 4, each section 17 is provided with two tip portions of the monitoring tube 16, but one monitoring tube 16 whose tip is open at a high position in each section 17 has the other end. It also serves as an air vent when the injection material is pumped into the respective compartments 17 through the monitoring pipe 16. That is, when the injection material is pumped, the injection material is heavy, so that the injection material is filled from a low position, and the whole of the compartment 17 is filled while the air and water in the compartment 17 are expelled from the monitoring pipe 16 opened to a high position. . Therefore, it can be confirmed that the injection material is sufficiently filled into the compartment 17 by confirming that the injection material comes out of the monitoring tube 16 whose tip portion is open at a high position. In addition, when the repair by injection | pouring of an injection material is not performed only by the detection of a water leak, what is necessary is just to arrange | position one front-end | tip part of the monitoring pipe | tube 16 in each division 17.
[0034]
And according to the water-impervious structure 10 of the first embodiment having the above-described configuration, the lower layer watertight asphalt 12, the water permeable asphalt layer 13, and the upper layer watertight asphalt 14 are excellent in strength and durability. Therefore, even if heavy equipment such as dump trucks, bulldozers, backhoes, etc. are run or swung to spread and roll the protective material 22 or waste 23 placed above this, The possibility of doing so is extremely low, and even if the waste 23 sinks due to compression, compaction, decomposition, etc., it will not be pulled in by this.
[0035]
Further, for example, even when the water shielding structure 10 is exposed on a slope before being covered with the waste 23 (see FIG. 1), due to its excellent strength and durability, it is deteriorated by solar radiation, crows, It is possible to easily avoid the water shielding structure 10 from being damaged by other external force.
[0036]
On the other hand, FIG.6 and FIG.7 shows the water-impervious structure 30 which concerns on 2nd Example of this invention. That is, the water-impervious structure 30 of the second embodiment is similar to the first embodiment described above in that the lower-layer water-tight asphalt 32 as the lower-layer impermeable layer and the drainage provided on the upper surface of the lower-layer water-tight asphalt 32 The water-permeable asphalt layer 33 is composed of a three-layer structure including a water-permeable asphalt layer 33 as a layer and an upper water-tight asphalt 34 as an upper impermeable layer formed so as to cover the water-permeable asphalt layer 33. 33 is divided into a large number of parallel vertical sections 37 partitioned by a partition wall 35 made of watertight asphalt extending in parallel in the same direction and in communication with the ground.
[0037]
Each section 37 is provided with a monitoring perforated pipe 38 as a leak detecting perforated pipe having a pore water pressure gauge inside, extending to a depth from the ground to the bottom 21 of the waste disposal site 11. It is installed.
[0038]
And according to the water-impervious structure 30 of the second embodiment, as with the water-impervious structure 30 of the first embodiment, the lower layer water-tight asphalt 32, the water-permeable asphalt layer 33 having considerable strength and durability, In addition, the upper layer watertight asphalt 34 is integrated to exhibit high strength and durability, and the intermediate water permeable asphalt layer 33 functions as a buffer layer, and lower layer watertightness due to a load from above. It becomes possible to effectively prevent the asphalt 32 and the upper watertight asphalt 34 from being damaged.
[0039]
In addition, the possibility of being damaged by heavy machinery traveling or turning upward is extremely reduced, and even when the waste 23 sinks due to compression, compaction, decomposition, etc., it is not pulled in by this, and the water shielding structure 30 Even if it is exposed, it can be easily avoided that it is deteriorated by solar radiation or damaged by crows or other external forces.
[0040]
Furthermore, it is possible to easily detect the presence or absence of water leakage to each section 37 by detecting the fluctuation of the water pressure by the pore water pressure gauge arranged in the monitoring perforated pipe 38, and the fluctuation of the water pressure is detected. If the perforated pipe for monitoring 38 is connected to an infusion pump and the solidified material is poured into this, the entire section 37 in which breakage is detected is detected through a number of holes formed in the perforated pipe for monitoring 38. In addition, it is possible to easily inject and fill the injection solidified material.
[0041]
In addition, this invention is not limited to the thing of the aspect of each said Example, In the range of the structure described in each claim, various changes can be employ | adopted. For example, the drainage layer does not necessarily need to be formed of water-permeable asphalt, and the upper impermeable layer can be formed using, for example, a water shielding sheet.
[0042]
Furthermore, it is also possible to detect the presence or absence of water leakage to each compartment of the drainage layer by vacuuming each compartment divided by an electrical method, and the drainage layer is not necessarily divided into a plurality of compartments by a partition wall. There is no need to partition.
[0043]
【The invention's effect】
As described above, according to the water-impervious structure in the waste disposal site of the present invention, a lower water-impermeable layer made of an asphalt mixture blended so as to have water-tightness, laid over the bottom ground, From a drainage layer composed of an asphalt mixture formulated so as to have water permeability, provided on the upper surface of the lower impermeable layer, and an asphalt mixture formulated so as to have water tightness formed so as to cover the upper surface of the drainage layer. Since the water-blocking structure is composed of a three-layered asphalt structure consisting of a lower impermeable layer, a common asphalt mixture is fixed to each of the lower impermeable layer, drainage layer, and lower impermeable layer. Can be
Therefore, the strength and durability of the entire water-impervious structure can be greatly increased , so even if heavy machinery is run or swung to spread waste and protective sand, the load is strengthened. So that it will not be damaged by bending or twisting, and even if the waste is sunk due to compression, consolidation, decomposition, etc., it will be pulled and damaged by them Therefore, it is possible to continue to maintain stable water shielding performance.
Moreover, it is possible to reliably prevent sewage from leaking from the waste disposal site to the surrounding ground, and to maintain stable water shielding performance.
Furthermore, while partitioning the drainage layer into a plurality of compartments with a partition wall, and disposing a water leak detection pipe and a perforated pipe in each compartment, it is possible to easily identify the compartment where water leakage has occurred due to breakage, The damaged section can be repaired easily .
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view illustrating a waste disposal site that employs a water shielding structure according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG. 1, showing the structure of the water shielding structure according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along the line BB of FIG.
FIG. 4 is a perspective view showing an example of an arrangement situation of partition walls and water leakage detection pipes.
FIG. 5 is a schematic cross-sectional view showing a situation where a water leakage detection pipe is communicated with a management pit.
FIG. 6 is a schematic cross-sectional view illustrating a waste disposal site that employs a water shielding structure according to a second embodiment of the present invention.
7 is a top view taken along the line CC of FIG. 6 for explaining the arrangement of the partition wall and the leak detection perforated pipe.
[Explanation of symbols]
10,30 Impervious structure 11 Waste disposal site 12,32 Lower watertight asphalt (lower impermeable layer)
13,33 Permeable asphalt layer (drainage layer)
14,34 Upper watertight asphalt (upper impermeable layer)
15, 35 Partition 16 Monitoring pipe (pipe for water leakage detection)
17, 37 Section 18 Management pit 20 Bottom ground 21 Bottom surface 38 Perforated pipe for monitoring (perforated pipe for water leakage detection)

Claims (4)

It is installed on the bottom ground of the waste disposal site and has a water shielding structure to prevent sewage from leaking from the inside of the disposal site to the surrounding ground,
A lower water-impermeable layer made of an asphalt mixture that is laid over the bottom ground and blended so as to have water-tightness;
A drainage layer made of an asphalt mixture formulated to have water permeability, provided on the upper surface of the lower impermeable layer;
An upper impermeable layer made of an asphalt mixture formulated so as to have water-tightness formed to cover the upper surface of the drainage layer,
A water shielding structure in a waste disposal site, wherein the asphalt mixture of each of the lower impermeable layer, the drainage layer, and the upper impermeable layer is fixed and integrated with each other .   The water-impervious structure in the waste disposal site according to claim 1, wherein the drainage layer is partitioned into a plurality of sections by a partition.  In the plurality of sections, one end of a water leakage detection pipe is arranged, and the other end of the water leakage detection pipe is formed in a management pit formed at a depth reaching the bottom surface of the waste disposal site. The waste disposal site according to claim 2, wherein the presence or absence of water leakage to each section is detected by communicating and inspecting the quality of water flowing into the management pit via the water leakage detection pipe. Impermeable structure.   The plurality of compartments are partitioned in a state of communicating with the ground by partitioning partitions extending in parallel in the same direction, and each compartment extends at least to a depth from the ground to the bottom surface of the waste disposal site. The water-impervious structure in the waste disposal site according to claim 2, wherein a perforated pipe for water leakage detection having a pore water pressure gauge is disposed therein.

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