JP5825668B2 - Impermeable purification system for sea surface waste disposal site - Google Patents

Description

  The present invention relates to a water-impervious purification system for a sea surface waste disposal site using a steel pipe sheet pile formed by fitting steel pipes together with a steel pipe joint.

  Conventionally, a steel pipe sheet pile wall in which each steel pipe is fitted with an H-shaped steel is known.

  This type of steel pipe sheet pile wall is an integral connection of steel pipes with H-shaped steel with flange edges joined to the peripheral surface of each steel pipe. Male and female joints are provided on the opposite side of the mutual connection. Is provided. In the fitting of the male joint and the female joint, the flange of the male joint enters between the flanges of the female joint, and the tip of the flange is close to the female joint so that an enclosed sealed space is formed. Then, this sealed space is filled with a filler such as concrete or mortar using a tremy tube, and the joint between the male and the male and the filler are used to improve the bond strength between the male and female joints and the proof stress at the joint. (For example, Patent Document 1).

2008-19608 publication

  However, in the steel pipe sheet pile wall of Patent Document 1, when a water channel occurs due to poor construction of the joint part, etc., the mortar is filled in the depth direction of the joint. It was difficult to do. In addition, even if the location of the water path can be specified by a sensor or the like, there is a problem that it is difficult to repair the water path.

  The present invention has been made in view of the above problems, eliminates the difficulty of finding and repairing water paths, and makes it possible to easily perform long-term management of water-blocking performance and repairs associated therewith. The purpose is to provide an on-site impermeable purification system.

In order to solve the above problems and achieve the above object, the first aspect of the present invention provides:
A water shield purification system of sea waste disposal site with a steel pipe sheet piles formed by fitting the steel each other by steel joint is constructed as a waste landfill seawall at the boundary sea and waste disposal sites, H-section steel and a steel pipe joint using the H-shaped steel linked fitted to each other, the fitting is the gap only swellable water stopping material filling is not steel pipe sheet pile wall formed on overlapping portions of another of the steel pipe fittings And a liquid which is injected into a cavity space formed by the inner wall of the steel pipe joint of the steel pipe sheet pile fitted to each other, and is a four-side sealed cavity by the inner wall of the steel pipe joint of the steel pipe sheet pile and the swellable water stop material level of the liquid that is injected into the space is the low potato than the height of the waste landfill site in contact with the steel pipe sheet pile wall.

  According to the present invention, since the steel pipe joints are fitted with each other, and the steel pipe sheet pile wall filled with the swellable waterstop material in the gap formed in the overlapping portion of the fitted steel pipe joints is provided. However, unlike the conventional case, it does not cause difficulty in finding and repairing the water channel, and the swellable water blocking material filled in the gap formed in the overlapping portion of the steel pipe joint is deteriorated and the water shielding performance is deteriorated. Even if it falls, the long-term management of the water shielding performance and the accompanying repair can be easily performed. In other words, for long-term management of the water-blocking performance, the water level in the cavity space is monitored, and the water level in the cavity space rises significantly, so that the steel pipe sheet pile wall on the sea area side and the disposal site side on the steel pipe joint part or on one side. Deterioration of water shielding performance can be found. Furthermore, the level of liquid injected into the hollow space is lower than the height of the waste disposal site in contact with the steel pipe sheet pile wall, so that the amount of leachate from the waste layer flowing into the hollow space increases. The infiltrated leachate can be shut off by collecting and draining with a pump, etc., and the leachate from the waste layer that can contain water-soluble harmful substances is drained to the pumping device. It is possible to purify harmful substances.

The second aspect of the present invention relates to a water-impervious purification system for a sea surface waste disposal site according to the first aspect, wherein the water permeability coefficient of the steel pipe joint of the steel pipe sheet pile on the waste disposal site side is 1 0.0 × 10 ⁻¹¹ m / s or more.

According to the present invention, the hydraulic conductivity of the steel pipe joint of the steel pipe sheet pile on the waste disposal site side is set to a high hydraulic conductivity of 1.0 × 10 ⁻¹¹ m / s or more, and therefore, from the waste layer flowing into the hollow space The amount of harmful substances advancing with both leachable water increases, and it is possible to purify the harmful substances from the waste layer in a wide range and improve the purification promotion performance.

  A third aspect of the present invention relates to a water-impervious purification system for a sea surface waste disposal site according to the first aspect, wherein the water permeability coefficient of the steel pipe joint of the steel pipe sheet pile on the waste disposal site side is the disposal It is characterized by having the same or less than the hydraulic conductivity of waste at the landfill site.

  The amount of leachate flowing into the hollow space from the waste layer is affected by the higher one of the permeability coefficient of the steel pipe joint and the permeability coefficient of the waste layer. According to the present invention, the water permeability coefficient of the steel pipe sheet pile joint on the waste disposal site side is set to be substantially equal to or less than the water permeability coefficient of the waste disposal site waste, thereby promoting the purification of harmful substances from the waste layer. Performance can be improved.

A fourth aspect of the present invention relates to a water-impermeable purification system for a sea surface waste disposal site according to any one of the first to third aspects, wherein the clay layer is located at the bottom of the waste disposal site. The water permeability coefficient is set to 1.0 × 10 ⁻¹⁰ m / s or less.

According to the present invention, the permeability coefficient of the clay layer at the bottom of the waste disposal site is set to a low permeability coefficient of 1.0 × 10 ⁻¹⁰ m / s or less, so that the advection from the clay layer at the bottom of the waste is performed. Because hazardous substances are reduced, hazardous substances can be contained in waste disposal sites. As a result, when there are few harmful substances advancing from the bottom of the waste, the harmful substances present in the waste layer concentrate on the steel pipe joint that is the only outflow path, and as a result, the purification promotion performance can be improved. .

  According to the present invention, since the water level of the liquid injected into the hollow space is lower than the height of the waste at the waste disposal site in contact with the steel sheet pile wall, the amount of leachate from the waste layer flowing into the hollow space is reduced. By increasing the amount of leachate that has flowed in and collecting it with a pump, etc., it is possible to shut off the water, and by draining leachate from waste that may contain water-soluble harmful substances to the pumping device, It is possible to purify hazardous substances in the waste layer.

It is a perspective view of the sea surface waste disposal site in one embodiment of the present invention. It is a top view of the connection part of the steel pipe and steel pipe of the steel pipe sheet pile wall in one Embodiment of this invention. It is explanatory drawing of the swelling water stop material with which the clearance gap formed in the overlap part of the steel pipe joint of the connection part was filled. It is a figure which shows the AA cross section of FIG. It is a figure which shows the relationship between the water level hold | maintained in the cavity space formed inside the steel pipe joint of a steel pipe sheet pile, and the mass flux of a harmful substance. It is a figure which shows the concentration distribution time calendar of the hazardous | toxic substance of a waste at the time of changing the water permeability coefficient of the steel pipe joint of the steel pipe sheet pile at a waste disposal site side. It is a figure which shows the relationship between the water permeability of the steel pipe joint of the steel pipe sheet pile of a waste disposal site side, and the mass flux of a harmful substance. It is a relationship between the permeability coefficient of the waste layer and the mass flux of harmful substances in the purification section. It shows the relationship between the hydraulic conductivity of the clay layer at the bottom of the waste disposal site and the mass flux of harmful substances. It is a figure which shows the relationship between the hydraulic conductivity of the clay layer of the waste bottom of a waste disposal site, and the density | concentration of a harmful substance in a density | concentration measurement cross section.

  Hereinafter, an embodiment of a water-impermeable purification system for a sea surface waste disposal site according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a sea surface waste disposal site according to an embodiment of the present invention.

The waste disposal site 1 is constructed at a position adjacent to the sea surface, and surrounds the waste 2 with a steel pipe sheet pile wall 3 (see FIG. 1). A clay layer 4 is deposited at the bottom of the waste disposal site 1, and the bottom surface is shielded by the clay layer 4 at the bottom of the waste disposal site 1. The steel pipe sheet pile wall 3 connects the cylindrical steel pipes 5 to each other by a steel pipe joint 6. Here, the steel pipe 5 and the steel pipe joint 6 are joined together by welding. In addition, although this embodiment demonstrates the steel pipe joint using H-section steel and H-section steel, it is not restricted to this, Steel pipe joint using P-section steel and T-section steel, L-section steel and T-section steel The steel pipe joint used may be used.

  Next, the steel pipe sheet pile wall 3 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a top view of the steel pipe sheet pile wall connecting portion of the steel pipe sheet pile wall according to one embodiment of the present invention, and FIG. 3 is a swellable stopper filled in a gap formed in the overlapping portion of the steel pipe joint of the connecting portion. It is explanatory drawing of a water material.

  The steel pipe sheet pile wall 3 is constructed at the boundary between the sea surface and the waste disposal site 1, and is connected to the steel pipe 5 by fitting the steel pipe joints 6 to each other (see FIG. 2). Specifically, a female joint 8 (width 300 mm, height 300 mm (see FIG. 3)) of the steel pipe joint 6 is joined by welding around one steel pipe 5, and a steel pipe joint is joined around the other steel pipe 5. A male joint 9 (width 250 mm, height 250 mm (see FIG. 3)) smaller than the female joint 8 of 6 is joined by welding, and the end of the male joint 9 is fitted into the end of the female joint 8. Steel pipes 5 are connected to each other. And the swelling water stop material 12 is filled in the clearance gap of the connected part of the mutually connected steel pipe joint 6 (refer FIG. 3). The swellable waterstop material 12 swells after being applied to the overlapping portion of the steel pipe joint 6. Thereby, the gap of the overlapping portion is filled with the swellable waterstop material 12. Thus, the water-blocking function is ensured by applying the swellable water-stopping material 12 to each contact surface of the gap between the overlapping portions of the female joint 8 and the male joint 9. The female joint 8 and the male joint 9 form a hollow space 11 inside the steel pipe joint 6 fitted to each other. In this way, the steel pipe sheet pile wall 3 in which the steel pipe joints 6 are connected to each other and connected to each other, and the gap formed in the overlapping portion of the connected steel pipe joints 6 is filled with the swellable waterproofing material 12 is provided. Thus, there is no difficulty in finding and repairing the water channel as in the prior art, and the swellable water-stopping material 12 filled in the gap formed in the overlapping portion of the steel pipe joint 6 is provided. Even if the water shielding performance deteriorates due to deterioration, the long-term management of the water shielding performance and the accompanying repair can be easily performed. That is, for long-term management of the water shielding performance, the water level of the hollow space 11 is monitored, and the water level of the hollow space 11 rises significantly, so that the steel pipe joint 6 on the sea area side of the steel pipe sheet pile wall 3 and the disposal site side. It is possible to detect the deterioration of the water shielding performance of both or one.

  Next, a water shielding / purifying technique using the hollow space 11 will be described with reference to FIGS. 4 and 5. 4 is a diagram showing a cross section AA of FIG. 2, and FIG. 5 is a diagram showing the relationship between the water level held in the hollow space formed inside the steel pipe joint of the steel pipe sheet pile and the mass flux of harmful substances. . FIG. 5 is performed using a model in which the influence of the waste layer does not reach the clay layer. Here, a steel pipe sheet pile is a building material in which two steel pipes are connected by a steel pipe joint.

When waste leachate containing water-soluble hazardous substances flows from the waste disposal site 1 through the steel pipe sheet pile wall 3 to the outside of the waste disposal site (such as the sea), the hollow space 11 in the steel pipe joint (steel pipe joint) 11 Will definitely pass. A liquid 13 (for example, water) is injected into the hollow space 11. The water level of the liquid 13 injected into the hollow space 11 is set lower than the height of the waste 2 in the waste disposal site 1 in contact with the steel pipe sheet pile wall 3. This is because the water level of the liquid 13 injected into the hollow space 11 is set to be lower than the height of the waste 2 in the waste disposal site 1 in contact with the steel pipe sheet pile wall 3 to purify the joint of the steel pipe joint 6 of the steel pipe sheet pile. This is because the acceleration performance is enhanced (see FIG. 5). This will be described with reference to FIG. As shown in FIG. 5, when the water level held in the hollow space 11 formed inside the steel pipe joint 6 is −10 m, the mass flux of harmful substances passing through the purification cross section is about 0.15 l regardless of the elapsed time. / M ² · year. On the other hand, when the water level held in the hollow space 11 formed inside the steel pipe joint 6 is kept at -5 m or -1 m, the mass flux of harmful substances passing through the purification cross section is about 0.095 l / m ^2. Year, about 0.0055 1 / m ² · year, and the purification performance decreases as the water level retained in the cavity 11 increases. This is because the amount of leachate from the waste layer that flows into the cavity space 11 is reduced due to an increase in the water level of the cavity space 11, and as a result, the amount of harmful substances that are transferred along with the leachate is also reduced. Thus, since the water level of the liquid 13 injected into the hollow space 11 is set lower than the height of the waste 2 in the waste disposal site 1 in contact with the steel pipe sheet pile wall 3, the waste layer flowing into the hollow space 11 from the waste layer The amount of leached water increases, and the infiltrated leached water is collected and drained by a pump (not shown) or the like, and can be blocked. Further, by draining leachate from a waste layer that may contain water-soluble harmful substances to a pumping device (not shown), it is possible to purify the harmful substances in the waste layer.

  Next, the containment performance and purification promotion performance of harmful substances in the steel pipe sheet pile wall 3 will be described with reference to FIGS. FIG. 6 is a diagram showing a concentration distribution time calendar of waste hazardous substances when the water permeability coefficient of the steel pipe sheet pile on the waste disposal site side is changed, and FIG. 7 is a steel pipe sheet pile on the waste disposal site side. It is a figure which shows the relationship between the water permeability of a steel pipe joint, and the mass flux of a harmful substance. 6 and 7 are conducted using a model in which the influence of the waste layer does not reach the clay layer.

The water permeability coefficient of the steel pipe joint 6 of the steel pipe sheet pile on the waste disposal site side is set to 1.0 × 10 ⁻¹¹ m / s or more. This is because the water permeability coefficient of the steel pipe sheet pile 6 of the steel pipe sheet pile on the waste disposal site side is set to a high water permeability coefficient of 1.0 × 10 ⁻¹¹ m / s or more, so that the waste layer flowing into the cavity space 11 This is because the amount of harmful substances transferred along with the leachate increases, and the purification of harmful substances from the waste layer can be performed in a wide range, and the purification promotion performance can be improved. This will be specifically described below.

As shown in FIG. 6, when a low water level environment is formed in the hollow space 11 inside the steel pipe joint 6, regardless of the water permeability coefficient of the steel pipe joint 6, harmful substances in the waste layer from the vicinity of the steel pipe joint 6 can be seen. Purification is ongoing. Further, the higher the water permeability coefficient of the steel pipe joint 6, the wider the purification range. That is, a wider range can be purified as the water permeability coefficient of the steel pipe joint 6 is higher. Here, the initial concentration of the disposal site side steel pipe joint in FIG. 6 is “0”, the total head is −10 m, the initial concentration of the waste layer is “1”, and the total head is 2 m. Further, as shown in FIG. 7, the mass flux of harmful substances passing through the purification cross section has a water permeability coefficient of the steel pipe joint 6 on the waste disposal site side of k = 1.0 × 10 ⁻⁷ m regardless of the elapsed time. / S, k = 1.0 × 10 ⁻⁹ m / s and k = 1.0 × 10 ⁻¹¹ m / s, about 3.4 l / m ² · year, about 0.15 l / m, respectively ² · year, about 0.027 l / m ² · year. As described above, the higher the water permeability of the steel pipe joint 6 is, the better the purification promotion performance is. This is because the influence of advection is prominent as the water permeability coefficient of the steel pipe joint 6 increases, and as a result, the purification promotion performance of the joint of the steel pipe joint 6 is dramatically improved. Therefore, the joint of the steel pipe joint 6 can exhibit excellent purification promoting performance by increasing the water permeability coefficient of the steel pipe joint 6.

  Next, the relationship between the water permeability coefficient of the steel pipe joint 6 and the water permeability coefficient of the waste layer will be described. FIG. 8 shows the relationship between the water permeability of the waste layer and the mass flux of harmful substances in the purification section. FIG. 8 is performed using a model in which the influence of the waste layer does not reach the clay layer.

The water permeability coefficient of the steel pipe joint 6 of the steel pipe sheet pile of the waste disposal site 1 is made substantially equal to or less than the water permeability coefficient of the waste material 2 of the waste disposal site 1. This will be specifically described below.

As shown in FIG. 8, the waste pipe has a water permeability coefficient of k = 1.0 × 10 ⁻⁵ m / s and k = 1.0 × 10 ⁻⁸ m / s, and is a steel pipe joint on the waste disposal site side. When the water permeability coefficient of 6 is k = 1.0 × 10 ⁻⁹ m / s, the mass flux of the harmful substance passing through the purification cross section regardless of the elapsed time is about 0.15 l / m ² · year, On the other hand, when the hydraulic conductivity of the waste layer decreases to k = 1.0 × 10 ⁻¹¹ m / s, the mass flux of harmful substances passing through the purification cross section regardless of the elapsed time is about 0.055 l / m ^2.・ Year. Thus, when the water permeability coefficient of a waste layer becomes lower than the water permeability coefficient of the steel pipe joint 6, it turns out that the purification promotion performance of the joint of the steel pipe joint 6 also reduces. This is because the amount of inflow from the waste disposal site 1 to the hollow space 11 inside the steel pipe joint 6 is affected by the lower permeability coefficient of the waste layer and the steel pipe joint 6. That is, when the permeability coefficient of the waste layer is higher than the permeability coefficient of the steel pipe joint 6, the flow rate of the water flowing through the waste layer is determined by the permeability coefficient of the steel pipe joint 6 on the waste disposal site side. On the other hand, when the permeability coefficient of the waste layer is lower than the permeability coefficient of the steel pipe joint 6, the flow rate of water flowing through the waste layer is slower than the flow rate of water flowing through the steel pipe joint 6 on the waste disposal site side. As a result, the flow rate flowing into the hollow space 11 through the steel pipe joint 6 is reduced, and the promotion of purification of harmful substances accompanying advection is suppressed. Thus, in this embodiment, since the hydraulic conductivity of the steel pipe joint 6 of the steel pipe sheet pile on the waste disposal site side is set to be substantially equal to or less than the hydraulic conductivity of the waste 2 of the waste disposal site 1, the waste layer The performance of promoting the purification of harmful substances can be improved.

Next, the relationship between the water permeability of the clay layer 4 and the purification promotion performance and containment performance will be described. 9 shows the relationship between the permeability coefficient of the clay layer at the bottom of the waste disposal site (the permeability coefficient of the steel pipe joint 6 is k = 1.0 × 10 ⁻⁹ m / s) and the mass flux of harmful substances. FIG. 10 is a diagram showing the relationship between the hydraulic conductivity of the clay layer at the bottom of the waste in the waste disposal site and the concentration of harmful substances in the concentration measurement section.

The hydraulic conductivity of the clay layer 4 at the bottom of the waste disposal site 1 is set to 1.0 × 10 ⁻¹⁰ m / s or less. This will be specifically described below.

First, the relationship between the water permeability coefficient of the clay layer 4 and the purification promotion performance will be described. As shown in FIG. 9, waste disposal is performed both when the permeability coefficient of the clay layer 4 is k = 1.0 × 10 ⁻⁸ m / s and when k = 1.0 × 10 ⁻¹² m / s. The mass flux of the harmful substance passing through the disposal site side end of the hollow space 11 inside the steel pipe joint 6 on the site side is about 0.12 l / m ² · year, and shows the same purification promotion performance. From this, it can be said that even if the water purification coefficient of the clay layer 4 changes, the purification promotion performance of the joint of the steel pipe joint 6 is not affected. This is because the amount of leaching water from the waste layer flowing into the hollow space 11 inside the steel pipe joint 6 is the same regardless of the water permeability coefficient of the clay layer 4, so that the harmful substances contained in the leaching water are the same. Because. However, as shown in FIG. 8, the purification promotion performance when the influence of the waste layer does not reach the clay layer 4 is about 0.15 l / m ² · year. It can be said that the purification promotion performance is better in the case of. This is because when the waste layer does not affect the clay layer 4, harmful substances present in the waste layer concentrate on the joint of the steel pipe joint 6, which is the only outflow path. The reason is that the acceleration performance becomes high.

Next, the relationship between the hydraulic conductivity of the clay layer 4 and the containment performance will be described. As shown in FIG. 10, when the hydraulic conductivity of the clay layer 4 is k = 1.0 × 10 ⁻⁸ m / s, the concentration of harmful substances in the concentration measurement section after 100 years is about 18%, When the water permeability coefficient of the clay layer 4 is k = 1.0 × 10 ⁻¹² m / s, the concentration of harmful substances in the concentration measurement section after 100 years is about 1.8%. This is because the outflow of harmful substances accompanying advection is promoted as the water permeability coefficient of the bottom clay layer 4 increases. Further, when the water permeability coefficient of the clay layer 4 is k = 1.0 × 10 ⁻¹⁰ m / s and k = 1.0 × 10 ⁻¹² m / s, it is harmful in the concentration measurement cross section after 100 years. The concentration of each substance is about 1.8%. This is because when the water permeability coefficient of the clay layer 4 is k = 1.0 × 10 ⁻¹⁰ m / s or less, the influence of advection is hardly received and the outflow occurs due to diffusion of harmful substances. As described above, when the water permeability coefficient of the clay layer 4 is k = 1.0 × 10 ⁻¹⁰ m / s or less, an excellent water-soluble harmful substance containment function can be exhibited. In this embodiment, the permeability coefficient of the clay layer 4 at the bottom of the waste disposal site 1 is set to a low permeability coefficient of 1.0 × 10 ⁻¹⁰ m / s or less. Since the harmful substances to be transferred are reduced, the hazardous substances can be contained in the waste disposal site. As a result, when there are few harmful substances advancing from the bottom of the waste, the harmful substances present in the waste layer are concentrated on the steel pipe joint 6 which is the only outflow path. As a result, the purification promotion performance can be improved. it can.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Waste disposal site 2 Waste 3 Steel pipe sheet pile wall 4 Clay layer 5 Steel pipe 6 Steel pipe joint 8 Female joint 9 Male joint 11 Cavity space 12 Swellable water stop material 13 Liquid

Claims (4)

A water-impervious purification system for a sea surface waste disposal site using a steel pipe sheet pile that fits steel pipes with steel pipe joints,
Built as a waste reclamation revetment at the boundary between the sea surface and the waste disposal site, the H pipes and H pipes using H pipes are connected together and connected, and the overlapping parts of the steel pipe fittings that are fitted together A steel pipe sheet pile wall in which a swellable water-stopping material is bonded only to the gap formed in
Liquid injected into a cavity space formed by the inner wall of the steel pipe joint of the steel pipe sheet piles fitted to each other,
Inner wall and level of the liquid to be injected into the four-way sealed the cavity space by the swelling water stopping material of a steel pipe joint of the steel pipe sheet piles, have lower than the height of the waste landfill site in contact with the steel pipe sheet pile wall seepage control purification system of sea-level waste disposal site. The water-impermeable purification system for a sea surface waste disposal site according to claim 1, wherein the water permeability coefficient of the steel pipe joint of the steel pipe sheet pile on the waste disposal site side is 1.0 x 10 ^-11 m / s or more. . 2. The sea surface waste disposal site according to claim 1, wherein a water permeability coefficient of the steel pipe joint of the steel pipe sheet pile on the waste disposal site side is set to be substantially equal to or less than a water permeability coefficient of the waste at the waste disposal site. Water purification system. The sea surface waste according to any one of claims 1 to 3, wherein the permeability coefficient of the clay layer at the bottom of the waste disposal site is 1.0 x 10 ^-10 m / s or less. Water shielding purification system for disposal sites.

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