JP2008265036A - Impervious sheet, its manufacturing method, impervious structure, and revetment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for manufacturing an impervious sheet which has at least one roughened surface capable of satisfying legal requirements associated with a thickness. <P>SOLUTION: The leading end of the impervious sheet 1 for a raw material wound around an upstream roller UR is pulled out and wound around a downstream roller DR. In this case, a high-temperature molten resin is sprayed in an atomized or linear state onto the upside surface of the impervious sheet 1 from a gun spray S1 which is provided in spray equipment S. Both the upside surface of the impervious sheet 1 and the molten resin are composed of a thermoplastic resin. The molten resin sprayed on the impervious sheet 1 is integrated with the upside surface of the impervious sheet 1 after it is cured. Thus, the one surface of the impervious sheet 1 can be roughened without reducing the thickness of the impervious sheet 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for manufacturing a water shielding sheet, a water shielding sheet, and an application of the water shielding sheet.

A water-impervious structure in which embankment is performed on a water-impervious sheet is used, for example, at a seawall or other revetment. Such revetments are often applied to waste disposal sites that were often constructed in the sea due to land problems, although they were often constructed in the mountains.
The revetment applied to the waste disposal site having the above-described water-impervious structure is typically as follows.
The revetment first has a caisson, which is the base of the revetment, placed on the sea floor and protruding from the sea surface at the top. A large amount of rubble, for example, is arranged around the caisson, particularly on the concave side where waste is discarded later, in order to create a slope with a downward slope from the upper end of the caisson or its vicinity toward the seabed. A water-impervious sheet is placed on the slope made of rubble stone, and embankment is performed on the presser stone placed on the water-impervious sheet. The embankment is mainly intended to protect the water shielding sheet from damage caused by waste, and is used as a space for dumping waste. The water shielding sheet prevents seawater from entering the concave surface from the outside sea outside the revetment, and prevents leachate from waste disposed on the concave surface from flowing out to the outside sea outside the revetment.
When a protective mat formed of, for example, a nonwoven fabric for protecting the water shielding sheet is disposed on or below the water shielding sheet, or both, the water shielding is performed on or above the protection mat, or both. For example, concrete, mortar, solidified soil, bentonite, and other water-impervious materials such as concrete, mortar, bentonite, etc. However, the waste disposal site having the water-impervious structure generally has the structure as described above.

The embankment performed on the water-impervious sheet is necessary for protecting the water-impervious sheet, but also has a negative surface that reduces the volume of the concave surface, which is a space where waste is dumped. Therefore, it is preferable to suppress the thickness of the embankment as much as possible.
However, in particular, in the case of a waste disposal site constructed in the sea area, the angle of the slope is often steep. In such a waste disposal site, it is necessary to prevent slipping from the impermeable sheet of the embankment, so the thickness of the soil is particularly large near the seabed. In other words, the slope of the surface of the embankment is gentler than the slope of the slope where the impermeable sheet is placed, and the base of the embankment will spread to a position far away from the lower end of the impermeable sheet. .
The same applies to the case where a protective mat is disposed on the water shielding sheet. In general, it is necessary to increase the thickness of the embankment particularly in the skirt portion in order to prevent the protective mat that comes into contact with the water-impermeable sheet having a smooth surface from sliding off the water-impervious sheet.

Due to the circumstances as described above, in the conventional water-impervious structure, the embankment is required to have a thickness greater than the thickness necessary to achieve the original purpose of protecting the water-impervious sheet. This is not preferred because it reduces the volume of the concave surface of the waste disposal site, as described above.
The inventor of the present application has repeated research to solve such a problem, and has obtained knowledge that the problem can be solved by making at least one surface of the water shielding sheet constituting the water shielding structure rough. The friction coefficient between the rough surface and the embankment or the rough surface and the protective mat when the rough side surface of such a water impervious sheet is brought into contact with the embankment or the protective mat is as follows. Therefore, the thickness of the embankment can be suppressed because the risk of slipping of the embankment and the protective mat is reduced.

In fact, there are water shielding sheets that can be used for such purposes overseas. The water shielding sheet is as follows.
This water shielding sheet is a resin water shielding sheet having smooth surfaces. This water-impervious sheet is manufactured by blowing hot air onto at least one surface of a material water-impermeable sheet that has been manufactured once in a smooth state, and then roughing the surface while melting it. The surface of the water shielding sheet on which hot air is blown becomes a rough surface after curing.
Such a water shielding sheet can be used in the waste disposal site as described above, but there is a reason to prevent it at least in Japan. In Japan, there is a strict limit on the thickness of the water shielding sheet used in the waste disposal site, and all parts of the water shielding sheet have a certain thickness or more. The reason for this is that it is not allowed to be used. In the above-described water-impervious sheet, the entire surface of at least one surface of the material water-impervious sheet having a predetermined thickness is roughened at random positions, and a portion having a thickness larger than the original thickness and a portion having a smaller thickness are mixed. Because of this, it is difficult to prove that all parts have a certain thickness required by the law. This is particularly noticeable with a water-proof sheet that is rough on both sides.
However, if there is a margin in the thickness of the material impermeable sheet, it will not be so difficult to prove that the material impermeable sheet has the thickness required by law in all parts. . However, if such a means is adopted, the thickness of the final water-impervious sheet is increased, for example, the flexibility is reduced, or the water-impervious sheet that is often handled as a roll is per roll. Many inconveniences occur due to the shortening of the length.

  The present invention provides a technique for producing a water-impervious sheet having a roughened at least one surface capable of satisfying the requirements of the law relating to thickness, and a water-impervious sheet produced by the technique. The issue is to provide applied technology.

The invention of the present application produces a water-impervious sheet having at least one surface thereof made of a resin and having a smooth resin surface, and having a water-impervious material water-impervious sheet and having a higher friction coefficient on the resin surface. It is the manufacturing method of the water-impervious sheet.
In this manufacturing method, the molten resin, which is a molten resin, is attached to the resin surface by spraying it in the form of a mist or a line, and the molten resin attached to the resin surface is cured. The resin surface is made rough by attaching the cured resin which is integrated with the resin surface and cured, thereby increasing the coefficient of friction of the resin surface.
The final thickness of the water shielding sheet described in the prior art may be larger or smaller than the thickness of the material water shielding sheet depending on the portion. On the other hand, in the manufacturing method of the present application, since the water shielding sheet is produced by adhering the molten resin to the material impermeable sheet, the final thickness of the water impermeable sheet is the material impermeable where the molten resin adheres. It becomes larger than the thickness of the sheet, and is the same as the thickness of the material water-impervious sheet where the molten resin is not attached. In other words, in the method for manufacturing a water-impervious sheet of the present application, if a material water-impervious sheet having a thickness greater than that required by law is used, a water-impervious sheet having a roughened resin surface, which is at least one surface of the water-impervious sheet, is manufactured. Not only will it be possible to ensure that the thickness of the manufactured water shielding sheet meets the legal requirements in all parts of the water shielding sheet. In addition, such a water shielding sheet does not become so thick that the thickness is unnecessary.

It is sufficient that at least one surface of the material water-impervious sheet is a smooth resin surface formed of resin. The material water-impervious sheet used in the present invention may be entirely made of resin, or part of it may be made of resin. For example, what coated one side or both sides of film materials other than resin with resin can be used as a material impermeable sheet in this application. In the present invention, when both surfaces of the material water-impervious sheet are resin surfaces, both resin surfaces can be roughened.
The material water-impervious sheet needs to be water-impervious. The term “water shielding” generally means that the hydraulic conductivity is on the order of 10 ⁻⁹ cm / sec or less in the industry of waste disposal sites. Giving meaning to the extent that it is difficult to let water through. The water imperviousness of the material water impervious sheet used in the present application includes a water permeability coefficient of the order of 10 ⁻⁴ cm / sec.

In the method for producing a water shielding sheet of the present application, the resin that forms the resin surface can be a thermoplastic resin, and the resin that becomes the molten resin can be a thermoplastic resin.
By using both the resin that becomes the molten resin and the resin that forms the resin surface as the thermoplastic resin, the molten resin after curing and the resin surface can be well integrated.

Conditions for spraying the molten resin onto the resin surface can be appropriately determined. The material of the molten resin, the temperature of the molten resin, the viscosity of the molten resin, the pressure or initial speed applied to the molten resin when spraying the molten resin on the resin surface, the amount of molten resin sprayed per unit area of the resin surface, the molten resin Equipment used when spraying on resin surface (for example, nozzle), shape when using nozzle when spraying molten resin on resin surface, resin from nozzle when using nozzle when spraying molten resin on resin surface The distance to the surface and the like can be appropriately selected depending on the circumstances of the rough surface formed on the resin surface.
The condition for spraying the molten resin on the resin surface is such that the coefficient of friction is 0.4 or more when earth, sand, nonwoven fabric, or woven fabric is placed on the rough resin surface. It can be a condition. (Note that in this application, the coefficient of friction is determined in relation to the object to be placed on the resin surface, and is necessarily determined in relation to earth and sand, non-woven fabric, and woven fabric. If there is such a coefficient of friction, the amount of embankment required when this waterproof sheet is used at a waste disposal site can be reduced. For example, the molten resin is sprayed onto the resin surface under such a condition that the friction coefficient when the above-described object is placed on the rough resin surface is about 0.4 to 0.6. be able to.

In the manufacturing method of the water-impervious sheet in the present application, the long material water-impervious sheet formed into a roll is unwound from the front end side and wound up from the front end side to form a roll again, and moves between the two rolls. You may make it spray the said molten resin on the said resin surface of a raw material impermeable sheet. In this manufacturing method, molten resin is sprayed on the material water-impervious sheet once manufactured by the conventional method. This manufacturing method has an advantage that the water shielding sheet can be used even if it is not an integral resin.
In the manufacturing method of the water-impervious sheet in the present application, the material impermeable sheet is formed into a long shape by extrusion molding by extrusion from the extrusion port, and is wound from the front end side into a roll, and moves from the extrusion port toward the roll. The molten resin may be sprayed onto the resin surface of the material water-impervious sheet. This manufacturing method has an advantage that it can be performed consistently from the manufacture of the material water-impervious sheet to the manufacture of the water-impervious sheet. It is preferable to spray the molten resin onto the material water-impervious sheet in a state where rough heat is removed from the material water-impervious sheet extruded from the extrusion port. For example, the temperature of the resin surface of the material water-impervious sheet to which the molten resin is sprayed is preferably 20 ° C. to 30 ° C., or the inside or outside thereof.
In either case of the above-described two methods, the molten resin can be sprayed onto the material impermeable sheet on both surfaces of the material impermeable sheet. In either case of the above-mentioned two methods, after the molten resin is sprayed onto the material impermeable sheet only on one side of the material impermeable sheet, the former of the above two methods is again treated as the material impermeable By performing on the surface of the sheet on which the molten resin is not sprayed, both surfaces of the water-impervious sheet can be roughened.

The present application also proposes a water shielding sheet that can be manufactured by the method for manufacturing a water shielding sheet described so far.
For example, the present application is a material water-impervious sheet having at least one surface formed of a resin and having a water-impervious property, and a molten resin that is a molten resin. On the other hand, a water shielding sheet having a mist shape or a linear shape, sprayed and attached, and then cured to be integrated with the resin surface is proposed.
This water shielding sheet not only has a roughened resin surface as at least one surface, but also can guarantee that the thickness meets the legal requirements in all parts of the water shielding sheet. . In addition, such a water shielding sheet does not have a thickness that is unnecessarily thick.

The present invention comprises a water-impervious sheet disposed on the slope so that the resin surface is on the front side, and a banking disposed on the resin surface of the water-impervious sheet, a water-impervious structure Propose. The waterproof sheet used for this waterproof structure is the waterproof sheet manufactured by the manufacturing method demonstrated so far, or the above-mentioned waterproof sheet.
This water-impervious structure can be provided in a waste disposal site, for example. This water shielding structure can cover, for example, the entire concave surface of the waste disposal site. The waste disposal site can be provided in the sea area, but it may be provided on land such as a conventional mountainous area or suburb. When the impermeable structure is provided at a waste disposal site in the sea area, the structure provided with the impermeable structure can be regarded as a revetment provided at the water's edge.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a method for manufacturing a water-impervious sheet will be described, and further a waste disposal site having a water-impervious structure to which the water-impervious sheet is applied will be described. In this embodiment, there are two types of methods for manufacturing the water shielding sheet. These are first described as production method 1 and production method 2.

<Manufacturing method 1>
In the manufacturing method 1, the process which is demonstrated below is performed to a raw material water-impervious sheet, and a water-impermeable sheet is manufactured. The material water-impervious sheet is generally called a water-impervious sheet.

The material water-impervious sheet used in the production method 1 is formed in a sheet shape and has water-impervious properties. This material water-impervious sheet is also not necessarily required, but also has a certain air permeability. The material water-impervious sheet needs to be made of at least one surface of a resin, more specifically, a thermoplastic resin. The both sides of the material water-impervious sheet of this embodiment are made of a thermoplastic resin. The entire material water-impervious sheet may be an integral resin, but in this embodiment, it has a three-layer structure as shown in FIG.
The material water-impervious sheet 1 includes a central layer 1A and has a structure in which both surfaces thereof are covered with a coating layer 1B.
The center layer 1A is a nonwoven fabric formed by compressing polyethylene fibers at high density. The center layer 1 </ b> A has a function of providing the material water-impervious sheet 1 with water shielding and appropriate air permeability.
The covering layer 1B is a nonwoven fabric formed by compressing polypropylene fibers at a high density, and is integrated with the central layer 1A. The coating layer 1B has a main role of protecting the central layer 1A.
The water permeability coefficient of the material water-impervious sheet 1 is set to the order of 10 ⁻⁴ cm / sec to 10 ⁻⁹ cm / sec. But the water permeability coefficient of the raw material impermeable sheet 1 may be smaller than the above-mentioned value. For example, the hydraulic conductivity may be on the order of 10 ⁻¹² cm / sec. The air permeability of the material water-impervious sheet 1 is about 220 m ³ / m ² / 24h to 1800 m ³ / m ² / 24h in this embodiment. As the above-mentioned material water-impervious sheet 1, for example, the apex sheet described in “Gas ventilation / rainwater control sheet capping system” which is a technical document created in April 2003 by the Ventilation / Waterproof Sheet Capping Method Study Group, A GLC sheet can be used.

Next, the installation and method for manufacturing a water-impervious sheet using the material water-impervious sheet 1 as described above will be described.
In this embodiment, the material water-impervious sheet 1 is long. First, as shown in the right side of FIG. 2, the material water-impervious sheet 1 is wound around the upstream roller UR into a roll shape. The roll-formed material water-impervious sheet 1 is unwound as the upstream roller UR rotates. The front end of the material water-impervious sheet 1 is connected to the downstream roller DR. The material water-impervious sheet 1 is wound up from the front end side with the rotation of the downstream roller DR.
That is, the material water-impervious sheet 1 is initially wound around the upstream roller UR, but is wound around the downstream roller DR as the upstream roller UR and the downstream roller DR rotate.
In this embodiment, the material water-impervious sheet 1 moves from the upstream roller UR toward the downstream roller DR while maintaining horizontal or substantially horizontal between the upstream roller UR and the downstream roller DR. The same applies to the manufacturing method 2 to be described later, but the facility for executing the manufacturing method 1 includes a function for applying a force for moving the material impermeable sheet 1 to the material impermeable sheet 1, and a material. Usually, other rollers having a function of supporting the water-impervious sheet 1 are provided, but illustration and explanation thereof are omitted because they are general-purpose techniques.
A spray facility S is provided between the upstream roller UR and the downstream roller DR. The spray facility S includes a gun nozzle S1, a molten resin feeder S2, and a pipe S3 that connects the gun nozzle S1 and the molten resin feeder S2.
The molten resin feeder S2 sends the molten resin produced by melting solid resin to the gun nozzle S1 via the pipe S3. The molten resin feeder S2 can be heated from the outside, for example, in order to melt the resin. The resin that becomes the molten resin is a thermoplastic resin. The molten resin may be polypropylene, polyethylene, or the like, but is polyethylene in this embodiment. The pipe S3 is formed in a tubular shape from a material that can withstand the heat of the molten resin. The gun nozzle S1 blows out the molten resin sent from the molten resin feeder S2 through the pipe S3 at a predetermined pressure from its tip. The molten resin is blown out in the form of a mist or a line from a hole (not shown) provided at the tip of the gun nozzle S1. In this embodiment, the gun nozzle S1 is provided on the upper side of the material water-impervious sheet 1 that moves from the upstream roller UR toward the downstream roller DR while maintaining horizontal or substantially horizontal, and is blown out from the gun nozzle S1. The molten resin is sprayed onto the upper surface of the material water-impervious sheet 1.
Although only one gun nozzle S1 is shown in FIG. 2, there may be a plurality of gun nozzles S1. For example, by arranging a plurality of gun nozzles S1 at appropriate intervals in the width direction of the material water-impervious sheet 1, the molten resin can be sprayed evenly over the entire width direction of the material impermeable sheet 1. Further, the gun nozzle S <b> 1 may be movable in a direction parallel to the material impermeable sheet 1, for example, in the width direction of the material impermeable sheet 1. In this case, even if the number of gun nozzles S1 is reduced, it becomes easy to spray the molten resin evenly over the entire width direction of the material water-impervious sheet 1. When the gun nozzle S1 is movable as described above, the pipe S3 connected to the gun nozzle S1 can be bent so as to follow the movement of the gun nozzle S1, and is made of, for example, a flexible material.

In the manufacturing method 1, the molten resin is sprayed from the gun nozzle S1 to the entire upper surface of the material water-impervious sheet 1 that moves while being kept horizontal or substantially horizontal between the upstream roller UR and the downstream roller DR (material blocking). It does not mean that the molten resin is sprayed so that the molten resin adheres to all the surfaces of the upper surface of the water sheet 1), and the molten resin is adhered to the upper surface of the material water-impervious sheet 1.
The high temperature molten resin is once cured after partially melting a part of the upper surface of the material impermeable sheet 1 and integrated with the upper surface of the material impermeable sheet 1. When the molten resin hardens, the material water-impervious sheet 1 is exposed from most of the upper surface of the material water-impervious sheet 1, but rises from the material impermeable sheet 1 in the form of streaks or dots. In this state, the molten resin is integrated. In this way, the upper surface of the material water-impervious sheet 1 becomes a rough surface. In this embodiment, the coefficient of friction determined by the relationship with the object placed on the roughened surface of the material water-impervious sheet 1 (in this embodiment, it is not necessarily limited to non-woven fabric) is 0. 0.4 or more, more specifically, within a range of about 0.4 to 0.6.
The molten resin is preferably cured before the material water-impervious sheet 1 is wound around the downstream roller DR. In order to make this possible, for example, the position of the gun nozzle S1 that sprays the molten resin onto the material water-impervious sheet 1 may be separated from the downstream roller DR.

The friction coefficient between the two when a placement object (the placement object in this case is also a non-woven fabric) is placed on the rough surface of the material impermeable sheet 1 is 0.40 to 0. The conditions suitable for setting to about 60 are shown below.
The gun nozzle S1 used in this embodiment is an AD31 system 16FT manufactured by Nordson Corporation.
[Table 1]
Temperature of resin to be sprayed: 140 ° C to 160 ° C
Spray pressure: 20-30 kgf / cm ²
Gun nozzle temperature: 130 ° C to 140 ° C
Nozzle and water shielding sheet distance: 10 cm to 30 cm
Amount of molten resin per unit area: 30 to 40 g / m ²

As an example, conditions suitable for setting the friction coefficient between the two when a nonwoven fabric as a placement object is placed on the roughened surface of the material water-impervious sheet 1 are shown below.
Under such conditions, when one surface of the material water-impervious sheet 1 is roughened, the rough surface of the material water-impervious sheet 1 includes a molten resin integrated into the material impermeable sheet 1 in a mesh shape. In addition, about 200 pieces / 100 cm ² of molten resin, which were formed into granular protrusions and integrated with the material water-impervious sheet 1, were observed.
[Table 2]
Spraying resin temperature: 150 ° C
Spray pressure: 26 kgf / cm ²
Gun nozzle temperature: 135 ° C
Nozzle and water shielding sheet distance: 20cm
Amount of molten resin per unit area: 30 to 40 g / m ²

Moreover, as another example, conditions suitable for setting the coefficient of friction between the two when a nonwoven fabric as a placement object is placed on the roughened surface of the material water-impervious sheet 1 are as follows: Show.
Under such conditions, when one surface of the material water-impervious sheet 1 is roughened, the rough surface of the material water-impervious sheet 1 includes a molten resin integrated into the material impermeable sheet 1 in a mesh shape. In addition, about 250 pieces / 100 cm ² of molten resin, which were formed into granular protrusions and integrated with the material water-impervious sheet 1, were observed.
[Table 3]
Spraying resin temperature: 150 ° C
Spray pressure: 26 kgf / cm ²
Gun nozzle temperature: 140 ° C
Nozzle and water shielding sheet distance: 20cm
Amount of molten resin per unit area: 45 to 55 g / m ²

In the manufacturing method 1, the water-impervious sheet having one surface made rough from the material impermeable sheet 1 was manufactured as described above.
In addition, it is also possible to make both surfaces of the raw material impermeable sheet 1 rough.
In that case, for example, the above-described gun nozzle S1 is disposed not only on the upper surface side but also on the lower surface side of the material water-impervious sheet 1, and the material water-impervious material is received from both the upper surface side and the lower surface side of the moving material impermeable sheet 1. The molten resin may be sprayed on the sheet 1.
Alternatively, a roll of the material water-impervious sheet 1 whose one surface is roughened by the manufacturing method 1 is arranged on the upstream roller UR described above, and the manufacturing method 1 is repeated once more, so that both surfaces of the material water-impervious sheet 1 are roughened. Can be. In this case, the upper surface of the material water-impervious sheet 1 that moves from the upstream roller UR toward the downstream roller DR is made to be a surface that is not a rough surface.

<Manufacturing method 2>
In the manufacturing method 2, the process from the production of the material impermeable sheet to the production of the impermeable sheet is performed in a consistent process.

The facilities and method for manufacturing a water-proof sheet by the manufacturing method 2 will be described.
The equipment for executing the manufacturing method 2 includes a material water-impervious sheet manufacturing apparatus M for manufacturing a material water-impervious sheet. The material impermeable sheet manufacturing apparatus M may be a general-purpose impermeable sheet manufacturing apparatus. In this embodiment, the material impermeable sheet manufacturing apparatus M generates a material impermeable sheet by extruding molten resin. The material impermeable sheet manufacturing apparatus M includes a supply apparatus (not shown) that supplies a raw material thermoplastic resin (for example, polyethylene) by softening it at a high temperature and a linear lip that molds the supplied resin. A mold (generally a T-die) M1. The resin extruded from the linear mold M1 becomes a long sheet, which becomes the material water-impervious sheet 1.
The equipment for executing the manufacturing method 2 is provided with the same downstream roller DR as in the manufacturing method 1. The downstream roller DR is connected to the front end of the material water-impervious sheet 1 and sequentially winds the material water-impervious sheet 1 manufactured continuously by the material impermeable sheet manufacturing apparatus M. In the manufacturing method 2, the material impermeable sheet 1 that moves from the material impermeable sheet manufacturing apparatus M toward the downstream roller DR is kept horizontal or substantially horizontal.
Between the material water-impervious sheet manufacturing apparatus M and the downstream roller DR, a spray equipment S configured in the same manner as described in the case of the manufacturing method 1 is provided. As described above, the spray facility S includes the gun nozzle S1, the molten resin feeder S2, and the pipe S3 connecting the gun nozzle S1 and the molten resin feeder S2. Even in the case of the manufacturing method 2, it is desirable that the molten resin is cured before the material water-impervious sheet 1 is wound around the downstream roller DR. For example, the spray equipment S is connected to the downstream roller. As described above, it is only necessary to move away from the DR.

In the manufacturing method 2, the molten resin is blown from the gun nozzle S1 to the entire upper surface of the material impermeable sheet 1 that moves between the material impermeable sheet manufacturing apparatus M and the downstream roller DR while maintaining horizontal or substantially horizontal. The molten resin is adhered to the upper surface of the material water-impervious sheet 1. The conditions given to the gun nozzle S1, the molten resin, etc. at this time can be the same as in the manufacturing method 1.
In addition, although the material impervious sheet 1 which came out from the material impervious sheet manufacturing apparatus M is high in temperature to some extent, the gun nozzle S1 used in the manufacturing method 2 has a molten resin on the raw material impervious sheet 1 in a state where rough heat is removed. It is good to provide in the position where can be sprayed. The material water-impervious sheet 1 coming out of the material water-impervious sheet manufacturing apparatus M generally has a temperature of about 160 ° C., but after it has dropped to about 20-30 ° C., the molten resin is sprayed. It is good.
The material water-impervious sheet 1 in which the sprayed molten resin is cured and integrated with the upper surface thereof has a rough surface on the upper surface for the same reason as in the manufacturing method 1. The material water-impervious sheet 1 whose upper surface is a rough surface is wound around the downstream roller DR to complete the water-impervious sheet.

  The water-impervious sheet produced by the production method 2 is rough only on one side, but a roll of the water-impervious sheet having only one side roughened is arranged on the upstream roller UR in the production method 1, By executing the method, both surfaces of the water shielding sheet can be roughened. In this case, the upper surface of the material water-impervious sheet 1 that moves from the upstream roller UR toward the downstream roller DR is made to be a non-rough surface.

<Waste disposal site>
A waste disposal site manufactured by applying the above-described manufacturing method 1 or manufacturing method 2 and applying a water shielding sheet having at least one rough surface will be described with reference to FIGS.

The waste disposal site in this embodiment is created in the sea area.
The waste disposal site has a caisson 20 disposed on the foundation rubble 10. The caisson 20 is hollow, and after being placed on the foundation rubble 10, a weight capable of withstanding waves is given by, for example, stuffing sand therein. The inside (the right side in FIG. 4) when viewed from the caisson 20 of the waste disposal site becomes the concave surface of the waste disposal site, and the waste is dumped there. The upper end of the caisson 20 is exposed at an appropriate height from the sea surface K so that even if some waves are generated, the seawater does not enter the concave surface beyond the caisson 20.
Note that the waste disposal site may be entirely surrounded by the caisson 20, but only a part of the outer periphery may be surrounded by the caisson 20 to have a structure as shown in FIG.
Inside the waste disposal site caisson 20, a rubble 30 is arranged. The rubble 30 is disposed after the caisson 20 is disposed. The rubble 30 creates a slope with a downward slope that extends from the upper end of the caisson 20 to the seabed by its upper surface.
On the slope, a water shielding structure 40 is made.

As shown in the cross-sectional view of FIG. 5, the water-impervious structure 40 has a five-layer structure in this embodiment. The water-impervious structure 40 is formed by sequentially laminating a protective material 41, a protective mat 42, a water-impervious sheet 43 (manufactured using the production method 1 or the production method 2), a protective mat 44, and a protective material 45 from the bottom. It is constructed on the above-mentioned slope formed by the rubble 30.
Of these, only the water shielding sheet 43 is essential. The protective material 41, the protective mat 42, the protective mat 44, and the protective material 45 may be provided as necessary.
Moreover, the lower end of the water-impervious structure 40 in this embodiment does not necessarily need to do so, but it is applied to the seabed beyond the lower end of the slope.
The water impervious sheet 43 has water impermeability and appropriate air permeability. Water-blocking prevents the intrusion of seawater that has entered the rubble 30 through the gap between the adjacent caissons 20 and the foundation rubble 10 under the caissons 20 into the concave surface, and is also discarded in the concave surface. Is required to prevent the leachate from flowing out of the concave surface. The moderate air permeability is to prevent the collapse of the rubble 30 or to cause the breakage of the water proof sheet 43 by discharging the air that has entered the rubble 30 for some reason into the concave space. It is useful for preventing the floating of the.
Both the protective members 41 and 45 and the protective mats 42 and 44 have a function of protecting the water shielding sheet 43. The protective members 41 and 45 are constituted by, for example, a material formed by filling a water-impervious material such as concrete, mortar, solidified soil, bentonite, or a material that swells and absorbs water such as water-absorbing rubber. The protective mats 42 and 44 are made of, for example, a woven fabric or a non-woven fabric.

On the water-impervious structure 40, an embankment 50 made by embankment is provided. In addition, before making the embankment 50, you may make it place the embankment 50 on the water-impervious structure 40 appropriately, and the embankment 50 may be made on it.
After making the embankment 50, the seawater in the concave surface is drained and the waste disposal site is completed.

In addition, in the waste disposal site of this embodiment, although it is not necessarily required, the 2nd water-impervious structure 60 extended on the foundation rubble 10 toward the inner side of a concave surface from the lower end of the caisson 20 is provided. The second water-impervious structure 60 has a five-layer structure similar to the water-impervious structure 40. The function of the second water-impervious structure 60 is substantially the same as that of the water-impervious structure 40, and complements the function of the water-impervious structure 40.
In the case where such a second water-impervious structure 60 is disposed, the caisson 20 may be disposed on the foundation rubble 10 and then disposed before the rubble 30 is disposed.

Sectional drawing which shows the structure of the raw material water impervious sheet used with the manufacturing method 1 of this invention. The figure which shows roughly the installation used with the manufacturing method 1 of this invention. The figure which shows roughly the installation used with the manufacturing method 2 of this invention. 1 is a partial cross-sectional view showing a configuration of a waste disposal site according to an embodiment of the present invention. Sectional drawing which shows the structure of the water-impervious structure of the waste disposal site shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Material impervious sheet 10 Foundation rubble 20 Caisson 30 Rubble 40 Water-impervious structure 41 Protective material 42 Protective mat 43 Water-impervious sheet 44 Protective mat 45 Protective material 50 Embankment 60 2nd water-impervious structure

Claims (8)

A water-impervious sheet that produces a water-impervious sheet having a larger coefficient of friction on the resin surface by using a material water-impervious sheet having at least one surface made of resin and having a water-impervious property. A manufacturing method of
The molten resin, which is a molten resin, is attached to the resin surface by spraying it in the form of a mist or a line,
Curing the molten resin adhered to the resin surface and integrating it with the resin surface;
The resin surface is roughened by adhering the cured molten resin, thereby increasing the friction coefficient of the resin surface.
A method of manufacturing a water shielding sheet. The resin that forms the resin surface is a thermoplastic resin,
The resin to be the molten resin is a thermoplastic resin.
The method for producing a water shielding sheet according to claim 1. The molten resin is applied to the resin surface under such a condition that the coefficient of friction with respect to the earth, sand, nonwoven fabric, woven fabric, and other objects to be placed on the resin surface that is roughened is 0.4 or more. Spray,
The manufacturing method of the water-proof sheet | seat of Claim 1 or 2. Unroll the long material impermeable sheet in a roll from its tip side and wind it from its tip side to make a roll again.
Spraying the molten resin on the resin surface of the material impermeable sheet moving between the two rolls,
The manufacturing method of the waterproof sheet of any one of Claims 1-3. The material impermeable sheet is molded into a long shape by extrusion molding by extrusion from the extrusion port, and rolled up from its tip side,
Spraying the molten resin onto the resin surface of the material impermeable sheet moving from the extrusion port toward the roll;
The manufacturing method of the waterproof sheet of any one of Claims 1-3. At least one surface thereof is a smooth resin surface formed of a resin, and a material water-impervious sheet having water-imperviousness,
It is a molten resin that is a molten resin, and is sprayed and adhered to the resin surface in the form of a mist or a line, and then cured to be integrated with the resin surface. And
Water shielding sheet having The water shielding sheet manufactured by the manufacturing method according to any one of claims 1 to 5, or the water shielding sheet according to claim 6, which is arranged in a state where the resin surface is on the front side on the slope.
Embankment disposed on the resin surface;
Comprising a water shielding structure. It is provided at the waterside and has the water shielding structure according to claim 7.
Revetment.

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