JP4607381B2 - Vertical impermeable sheet and method for inspecting impermeable wall constructed using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a vertical water-impervious sheet that constructs a water-impervious wall by burying the lower part thereof in the ground in a state where side edges of adjacent ones are connected.
[0002]
[Prior art]
For example, in order to prevent the outflow of sewage from a waste disposal site, a technique of constructing a water shielding wall using a vertical water shielding sheet is used.
Such a vertical water-impervious sheet is provided with a sheet material provided with a connection portion that can be connected to other connection portions along both side edge portions and provided with water-imperviousness. Then, with the side edges of the adjacent objects fixed by the connection part, the lower part is buried in the ground, and the adjacent water-impervious sheets are continuously connected to construct a water-impervious wall. It is like that.
The above-described connecting portion is generally as follows.
That is, one of the connecting portions provided at both side edge portions of each vertical water-impervious sheet is a receiving portion that is a groove that becomes wider toward the inside, and the other is translated while being along its longitudinal direction. The bulging portion is shaped to be prevented from being pulled out when inserted into the receiving portion. That is, after burying the lower part of one vertical water-impervious sheet in the ground, the bulging part of the adjacent vertical water-impervious sheet fits into the receiving part of the vertical water-impervious sheet, or The impermeable wall is constructed by repeating the work of embedding the lower part of the adjacent vertical impermeable sheet in the ground while the receiving part of the adjacent vertical impermeable sheet is fitted to the bulging part of the sheet. Is done.
[0003]
Although such a vertical water-impervious sheet is useful in itself, there is a point that requires improvement.
That is, after the impervious wall is constructed by embedding the vertical impervious sheet, it is impossible to perform a post-examination on the soundness of the impervious wall.
For example, when the impermeable wall is embedded in the ground, the impermeable sheet itself may be damaged, or the connecting portions of the impermeable sheet may not fit well. If there is such a problem, the water-impervious wall cannot exhibit its water-impervious function. Therefore, when such a problem occurs, it is necessary to reconstruct the vertical water-impervious sheet.
However, there is no useful technique for discovering such a problem at present. In general, visual inspection is performed. However, since the above-described problems occur in the ground, visual inspection is limited. In addition, it has been practiced to dig up the ground around the vertical impermeable sheet once buried, and to conduct a visual inspection in that state, but in order to perform such an inspection, a large amount of earth and sand storage is required. In addition, labor and cost burden tend to be excessive.
[0004]
[Problems to be solved by the invention]
The present invention has been made by recognizing such a problem, and a vertical impermeable sheet capable of performing a subsequent inspection on the soundness of the constructed impermeable wall without requiring excessive labor and cost. It is to provide.
[0005]
[Means for Solving the Problems]
The inventions proposed to solve such problems are roughly divided into two.
Hereinafter, they will be referred to as a first invention and a second invention, and will be described in order.
[0006]
1st invention is based on the vertical water-impervious sheet | seat which builds a water-impervious wall by burying the lower part in the ground in the state which connected the side edge part of adjacent things.
And this vertical water-impervious sheet is provided with connection parts that make connections with other connection parts along both side edge parts, a sheet material provided with water-imperviousness, and the ground of the sheet material And both ends of the sheet material exposed from a portion not embedded in the conductive material, and a conductive body disposed so as to pass through a predetermined range of the portion embedded in the ground of the sheet material.
The soundness of the impermeable wall constructed by burying the vertical impermeable sheet in a state where the side edges of adjacent ones are connected to each other substantially vertically with respect to the ground is determined by It can test | inspect by measuring the resistance between the both ends of the said conductor exposed from the vertical water-impervious sheet | seat of one of what comprises. This is to inspect the breakage that has occurred in the vertical water-impervious sheet when buried in the ground. That is, when the sheet material of the vertical water-impervious sheet is damaged, and the conductor is damaged, the electrical resistance between both ends of the conductor exposed from the sheet material is significantly increased. The vertical water-impervious sheet according to the first invention can perform a subsequent inspection of the soundness of the impermeable wall by detecting this change in electrical resistance.
In this inspection, it is only necessary to measure the electric resistance between both ends of the conductive body exposed from the sheet material, so that an excessive burden of labor and cost cannot occur.
[0007]
The conductor may be composed of any material. For example, this can be constituted by a conducting wire.
Both ends of the conductor need to be exposed from the ground even after the vertical water-impervious sheet is embedded in the ground. In addition, at least a part of the intermediate portion of the conductive body needs to be located in the ground after the vertical water shielding sheet is embedded in the ground. As long as this condition is satisfied, the arrangement of the conductors is not particularly limited. Further, as long as this condition is satisfied, the conducting body may be constituted by a plurality of members.
As described above, both ends of the conductive body may be exposed from the ground even after the vertical water-impervious sheet is embedded in the ground. For example, what is necessary is just to distribute | arrange so that the both ends may be exposed from the upper edge part of a vertical water-impervious sheet. In this way, when the vertical water-impervious sheet is embedded in the ground from below, both ends of the conductive body are exposed from the ground unless the vertical water-impervious sheet is completely embedded. In this case, the conductor may be arranged so that both end portions thereof are exposed from the vicinity of both side edge portions of the upper edge portion of the sheet material.
As described above, at least a part of the intermediate portion of the conductor needs to be located in the ground after the vertical water-impervious sheet is embedded in the ground. In this case, any path may be used for the conductor. The conductor may meander the sheet material over the entire surface.
The conductor may be arranged so that a part thereof is along the lower edge of the sheet material in the vicinity of the lower edge of the sheet material. By disposing a conductive body in the vicinity of the lower edge of the sheet material, which is likely to be damaged, the sheet material can be efficiently detected. The conductor may also be arranged so as to pass near the periphery of the sheet material. By passing through the vicinity of the peripheral portion of the sheet material even in the portion other than the vicinity of the lower edge portion, the breakage of the sheet material can be found more efficiently. In this case, both ends of the conductor are exposed from the vicinity of both side edges of the upper edge of the sheet material.
Further, at least a part of the conductive body may be embedded in the sheet material.
[0008]
The specific shape of the sheet material is not questioned. Considering the construction of a water shielding wall using a plurality of these, it is preferable that the side edges are parallel. The shape of the upper edge portion and the lower edge portion is not particularly limited, but can also be parallel to each other. The sheet material can be, for example, a substantially rectangular shape.
The connecting portion provided in the sheet material may be integrated with the sheet material. Moreover, you may become another member. For example, the sheet material is a connection between the substantially rectangular sheet base material and another connection member, and is a separate member from the sheet base material, and along both edges of the sheet base material. And a connecting member attached thereto. In this case, the above-described conductors are connected to each of the connecting members, and are exposed from the upper end portion of the connecting member and are arranged so as to extend near the lower end portion of the connecting member, It can be composed of a horizontal conductor disposed near the lower edge of the sheet material while conducting the vicinity of the lower end portion of the longitudinal conductor.
[0009]
Next, the second invention will be described.
The second invention is based on a vertical water-impervious sheet that constructs a water-impervious wall by burying the lower part in the ground with the side edges of adjacent ones connected.
And this vertical water-impervious sheet is provided with connection parts that make connections with other connection parts along both side edge parts, a sheet material provided with water-imperviousness, and the ground of the sheet material One end is exposed from a portion that is not embedded in the conductive material, and the other end is positioned near the lower end of the sheet material, and the conductive body is connected near the lower end of the conductive body. A contact body provided, and the conductive body is appropriately connected to a connection portion of an adjacent vertical water-impervious sheet, with the connection portion in the vicinity of the conductive body through which the conductive body is conducted. Sometimes, it is configured to conduct with a contact body provided in the vicinity of the connecting portion of the adjacent vertical water shielding sheet.
The soundness of the impermeable wall constructed by embedding this vertical impermeable sheet with the side edges of adjacent ones connected to each other almost vertically with respect to the ground constitutes the impermeable wall. It can test | inspect by measuring the resistance between the said one ends of the two conductors each provided in the vicinity of the connection part mutually connected of two adjacent water-impervious sheets of what to do. This test | inspects whether the connection parts of a vertical water-impervious sheet | seat are completely fitting when embed | buried in the ground. In this vertical water-impervious sheet, at the time of construction of the water-impervious wall, the two conductors provided near the two connecting parts connected to each other, and the contact bodies respectively connected to these are (conductors) ⇒ A series of circuits of (contact body) ⇒ (contact body) ⇒ (conducting body) is formed. However, this series of circuits is formed only when the adjacent connection portions are appropriately connected to each other. When the adjacent connection portions are not properly connected, the connection between the two contact bodies is not established. It will be cut or become insufficient.
Therefore, when the above resistance measurement is performed, if the resistance is remarkably large, if the connection portions are not properly connected, otherwise the connection portions are appropriately connected. Can be judged. Thus, according to this vertical water-impervious sheet, it becomes possible to perform a subsequent inspection of the soundness of the water-impervious wall. Note that the contact body is preferably provided in the vicinity of the lower edge of the sheet material in consideration of the fact that it is near the lower edge of the sheet material that is likely to cause a failure in fitting between the connecting portions.
In this inspection, too much labor and cost are not caused as in the case of the first invention.
[0010]
As in the case of the first invention, the conductor may be composed of any material.
Moreover, each upper end part of a conductor needs to be exposed from the ground even after the vertical water-impervious sheet is embedded in the ground. If this is satisfied, there is no particular limitation on the shape and path of the conductor. The conductive body may be arranged in the vicinity of both connection portions of the sheet material so as to be along the connection portion. You may distribute | arrange so that the both ends may be exposed from the both-sides edge part vicinity of the upper edge part of a sheet | seat material. In this way, when the vertical water-impervious sheet is embedded in the ground from below, both ends of the conductor are necessarily exposed from the ground unless all the vertical water-impervious sheets are embedded. On the other hand, the lower end portions of the two conductive bodies are electrically connected to the contact portion directly or using another.
Further, at least a part of the conductive body may be embedded in the sheet material.
[0011]
As in the case of the first invention, the specific shape of the sheet material is not questioned. As in the case of the first invention, various shapes can be adopted. The sheet material can be, for example, a substantially rectangular shape.
The connecting portion provided in the sheet material may be integrated with the sheet material. Moreover, you may become another member. For example, the sheet material is a connection between the substantially rectangular sheet base material and another connection member, and is a separate member from the sheet base material, and along both edges of the sheet base material. And a connecting member attached thereto. In this case, the above-described conducting body can be arranged on each of the connection members so as to be exposed from the upper end portion of the connection member and to extend near the lower end portion of the connection member.
The shape of the connecting member is not questioned. It is sufficient if the connection members can be connected in a state where the water shielding performance can be exhibited. For example, one of the connecting members provided on the sheet material has a receiving portion that is a groove that becomes wider toward the inside, and the other of the connecting members is moved in parallel with the longitudinal direction of the connecting member and moved to receive the receiving member. You may make it have a bulging part made into the shape which is pulled out when inserted in a part. In this case, a contact body that is electrically connected to the conductive body provided in the connecting member having the receiving portion is arranged inside the vicinity of the lower end of the receiving portion, and the conductive body is electrically connected to the outside of the vicinity of the lower end of the bulging portion. You may arrange | position the made contact body.
The contact body may be made of any material that can conduct electricity. The material can be a metal and the shape can be a plate. If this is formed with a metal plate and covers both side edges of the lower edge portion of the sheet material, the contact body can also have a function of protecting the sheet material in addition to the function of conducting. Become.
[0012]
Both the first invention and the second invention described above can be implemented independently, but can also be implemented by combining them. In that case, it is also possible to share a part of the conductor of the first invention and the conductor of the second invention.
For example, the vertical conductor in the first invention can be shared with the conductor in the second invention.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of a preferred embodiment of the present invention will be described.
[0014]
The vertical water-impervious sheet S according to this embodiment is as shown in FIGS. 1 and 2. FIG. 2 is a view showing the vertical water-impervious sheet S shown in FIG. 1 as viewed from below (the AA direction in FIG. 1).
[0015]
The vertical water-impervious sheet S includes a sheet material 100. The sheet material 100 includes a sheet base 110, a male connection member 120, and a female connection member 130. The sheet base 110, the male connection member 120, and the female connection member 130 may be integrated, but in this embodiment, they are separate members.
[0016]
The sheet substrate 110 is not necessarily so, but has a rectangular shape. The sheet base material 110 has a water shielding performance. The material may be any material as long as it has water shielding performance, but it can be made of, for example, high density polyethylene.
One of the male connection member 120 and the female connection member 130 is attached to one of the side edge portions of the sheet base material 110, and the other is attached to the other of the side edge portions of the sheet base material 110. The male connection member 120 and the female connection member 130 are configured to be connected to each other over the length direction. Further, the connection is such that the water shielding performance can be maintained.
[0017]
The male connection member 120 and the female connection member 130 may have a cross section as shown in FIG. 2, for example. The male connection member 120 and the female connection member 120 are also provided with water shielding performance. The material may be any material as long as it has water shielding performance. In this embodiment, the material is made of high-density polyethylene.
[0018]
The male connecting member 120 includes a plate-shaped male plate portion 121 and a bulging portion 122 provided in a direction away from the sheet base material 110. The male plate portion 121 is for connection with the sheet base material 110. Although not limited to this, in this embodiment, the male plate part 121 and the sheet base material 110 are connected by thermal welding. The bulging portion 122 is thicker than the male plate portion 121. As shown in FIG. 2, the bulging portion 122 in this embodiment has a cross section formed in an arrow shape.
A male conductor 123 is disposed on the male connection member 120 along the male connection member 120. The male conductor 123 in this embodiment is arranged inside the male connection member 120 so as to extend over the entire length of the male connection member 120, and its upper end is exposed from the upper end of the female connection member 130. It is like that. The male conducting wire 123 is arranged inside the male connecting member 120 when the male connecting member 120 is manufactured. In addition, both the male connection member 120 and the female connection member 130 in this embodiment have the same cross section at any position in the length direction. Such a shape can be easily molded by using a resin extrusion molding technique, and is convenient in production. While embedding the male conducting wire 123 in the inside, a member having the same cross section as that of the male connecting member 120 and longer than the male connecting member 120 is manufactured, and then cut into an appropriate length. The male connection member 120 is manufactured.
Further, on both surfaces of the male plate portion 121, male contact bodies 124, which are rectangular metal plates formed of a conductive metal, are respectively disposed. The male contact body 124 is formed of a conductive metal, and is fixed to the male plate portion 121 by a rivet 125 that penetrates the two male contact bodies 124 together with the male plate portion 121. Further, the rivet 125 comes into contact with the male conductor 123 described above. As a result, the male contact body 124 is electrically connected to the male conductor 123 via the rivet 125.
Further, a lateral conductor 140 is provided in the vicinity of the lower edge portion of the sheet base 110 so as to follow the lower edge portion. The rivet 125 is in contact with the horizontal conductor 140.
[0019]
The female connection member 130 includes a plate-shaped female plate portion 131 and a receiving portion 132 provided in a direction away from the sheet base material 110. The female plate portion 131 is for connection with the sheet base 110. Although not limited to this, in this embodiment, the female plate portion 131 and the sheet base 110 are connected by thermal welding. The receiving portion 132 is a groove that becomes wider toward the inside. The receiving portion 132 in this embodiment substantially corresponds to the shape of the bulging portion 122, as shown in FIG. That is, the groove is formed so that the cross section of the groove has an arrow shape corresponding to the bulging portion 122.
The female connecting member 130 is provided with a female conductor 133 along the same. The female conductor 133 in this embodiment is arranged inside the female connection member 130 so as to extend over the entire length of the female connection member 130, and its upper end is exposed from the upper end of the female connection member 130. It is like that. The female conductor 133 is disposed inside the female connection member 130 when the female connection member 130 is manufactured. Note that both the female connection member 130 and the female connection member 130 in this embodiment have the same cross section at any position in the length direction. Such a shape is advantageous during manufacture, as in the case of the male connection member 120.
A portion of the female connecting member 130 extending from the outer surface of the receiving portion 132 to the opening of the receiving portion 132 is covered with a female contact body 134 formed by bending a metal plate of a conductor. The female contact body 134 is formed of a conductive metal, and is fixed to the female plate portion 131 by a rivet 135 that penetrates both female contact bodies 134 together with the female plate portion 131. The rivet 135 is in contact with the female conductor 133 described above. Thereby, the female contact body 134 is electrically connected to the female conductor 133 via the rivet 135. The rivet 135 is also in contact with the horizontal conductor 140 described above.
Note that a plate spring 136 formed of a conductive metal is attached to the female contact body 134 at a position facing the receiving portion 132 in a state of being electrically connected to the female contact body 134. As will be described later, the leaf spring 136 functions to force the male contact body 124 and the female contact body 134 to contact each other when the bulging portion 122 is fitted into the receiving portion 132.
[0020]
Next, the usage method of the vertical water-impervious sheet S described above, that is, a method for constructing a water-impervious wall by using this and a method for confirming the soundness of the impermeable wall will be described.
[0021]
In order to construct a water-impervious wall using this vertical water-impervious sheet S, first, one vertical water-impervious sheet S is buried in the ground while maintaining a substantially vertical depth to a predetermined depth. The vertical impermeable sheet S can be embedded by using a penetrating machine such as a known high-frequency vibrator or press-fitting construction machine, or by using a water jet. Next, a second vertical water-impervious sheet S is embedded next to the second vertical water-impervious sheet S. At this time, the bulging part 122 of the second vertical water-impervious sheet S is fitted to the receiving part 132 of the vertical impermeable sheet S already buried, or the vertical impermeable sheet S already buried is fitted. The receiving part 132 of the second vertical water-impervious sheet S is fitted to the bulging part 122. That is, the bulging part 122 of the other vertical water-impervious sheet S moves in parallel within the receiving part 132 of the one vertical water-impervious sheet S. This state is shown in FIG. As apparent from FIG. 3, the first vertical water-impervious sheet S and the second vertical water-impervious sheet S are separated from the receiving part 132 of the vertical water-impervious sheet S on the one side thereof. The bulging portion 122 is prevented from being removed. By repeating this, a water shielding wall in which the vertical water shielding sheets S are continuous is constructed. An example of the constructed impermeable wall is shown in FIG. In addition, even if it repeats the above-mentioned process, the water shielding performance in the joint of the vertical water shielding sheets S is ensured to some extent. However, in order to further improve the water shielding performance, a water-expandable rubber may be disposed between the receiving portion 132 and the bulging portion 122 that are fitted together. If water expandable rubber is arranged here, when water enters between the receiving portion 132 and the bulging portion 122, the water expandable rubber expands so as to fill the gap. It is almost impossible for water to pass through here, and the water imperviousness of the impermeable wall can be improved.
[0022]
Next, an inspection method for confirming the soundness of the constructed impermeable wall will be described.
First, an inspection method for investigating whether there is any breakage in one of the impermeable walls will be described.
In this case, as is done using the resistance meter indicated by T1 in FIG. 4, between the male conductor 123 and the female conductor 133 exposed from the upper end of the vertical water-impervious sheet S where it is desired to know whether there is damage. Measure resistance. At this time, a circuit of (male conductor 123) → (rivet 125) → (lateral conductor 140) → (rivet 135) → (female conductor 133) is formed from the male conductor 123 to the female conductor 133. However, the resistance value of this circuit increases remarkably if any part of the circuit (for example, the horizontal conductor 140) is cut or damaged. Therefore, as a result of the above resistance measurement, when the resistance of this circuit is not significantly larger than the expected resistance value, the vertical water-impervious sheet S is not damaged and the resistance is significantly increased. If it is, it is determined that the vertical water-impervious sheet S is damaged.
Next, a method for inspecting whether or not the connection between the male connection member 120 that connects one impermeable wall and the adjacent impermeable wall and the female connection member 130 is appropriately performed will be described.
In this case, as performed using the resistance meter indicated by T2 in FIG. 4, the male connection member 120 to which the adjacent vertical water shielding sheet S is connected and the upper end of the female connection member 130 are respectively exposed. The resistance between the male conductor 123 and the female conductor 133 is measured. At this time, from the male conductor 123 to the female conductor 133, a circuit of (male conductor 123) ⇒ (rivet 125) ⇒ (male contact body 124) ⇒ (female contact body 134) ⇒ (rivet 135) ⇒ (female conductor 133). Is formed. However, if this circuit is cut off somewhere in the circuit, or if the connection between the male contact body 124 and the female contact body 134 becomes insufficient, the resistance value thereof increases significantly. . Therefore, as a result of the above resistance measurement, if the resistance of this circuit is not significantly higher than the expected resistance, the resistance will be significantly increased if the vertical water shielding sheets S are properly connected. If it is, it is determined that the connection between the vertical water shielding sheets S is inappropriate.
[0023]
【The invention's effect】
Since the vertical water-impervious sheet according to the present invention is as described above, a post-examination of the soundness of the impermeable wall constructed using the sheet can be performed without requiring excessive labor and cost. .
[Brief description of the drawings]
FIG. 1 is a diagram showing an overview of a vertical water-impervious sheet according to an embodiment of the present invention.
2 is a diagram showing the vertical water-impervious sheet shown in FIG. 1 as viewed from the direction AA in FIG. 1;
FIG. 3 is a view showing a vicinity of a connection portion when the vertical water-impervious sheet shown in FIG. 1 is connected to another vertical water-impervious sheet as viewed from the direction AA in FIG. 1;
FIG. 4 is a view showing an example of use of the vertical water shielding sheet shown in FIG.
[Explanation of symbols]
S vertical water-impervious sheet 100 sheet material 110 sheet base material 120 male connection member 121 male plate part 122 bulging part 123 male conductor 124 male contact body 125 rivet 130 female connection member 131 female plate part 132 receiving part 133 female conductor 134 female contact Body 135 Rivet 140 Horizontal conductor

Claims (11)

It is a vertical water-impervious sheet that builds a water-impervious wall by burying the lower part of the adjacent parts in the ground with the side edges of adjacent ones connected to each other, along the side edges of the other connecting parts. Are connected to the sheet material, and both ends thereof are exposed from a portion of the sheet material that is not embedded in the ground, and embedded in the ground of the sheet material. A vertical water-impervious sheet comprising a conductive body arranged to pass through a predetermined range of a portion to be formed ,
The sheet material is for connecting a substantially rectangular sheet base material and another connecting member, is a separate member from the sheet base material, and is attached along both edge portions of the sheet base material. And the conductive member is disposed on each of the connection members so as to be exposed from the upper end portion of the connection member and to extend in the vicinity of the lower end portion of the connection member. A vertical conductive body of the book, and a horizontal conductive body disposed near the lower edge of the sheet material while conducting the vicinity of the lower end portion of the vertical conductive body,
Vertical water shielding sheet.   The vertical water-impervious sheet according to claim 1, wherein at least a part of the conductive body is embedded in the sheet material. Along with the both side edges, there are connecting parts that connect with other connecting parts, and both ends are exposed from the sheet material provided with water shielding properties and the part of the sheet material that is not embedded in the ground. And a conductive body arranged so as to pass through a predetermined range of a portion embedded in the ground of the sheet material, the sheet material being a substantially rectangular sheet base material, and the like And a connecting member that is a separate member from the sheet base material and is attached along both edge portions of the sheet base material, and the conductive body. Are connected to each of the connection members so as to be exposed from the upper end of the connection member and to extend near the lower end of the connection member, and the lower end of the vertical connection While making the neighborhood conductive, under the sheet material A transverse conductive member which is disposed in the vicinity of parts, consisting of a vertical water shield sheet, in a state of connecting the side edges of adjacent ones of water shield wall constructed by burying the downward Ground A method for inspecting a water-impervious wall to check its soundness,
Including a step of measuring a resistance between both end portions of the conductive body exposed from a vertical water shielding sheet of one of the water shielding walls.
Inspection method for impermeable walls.   It is a vertical water-impervious sheet that builds a water-impervious wall by burying the lower part of the adjacent parts in the ground with the side edges of adjacent ones connected to each other, along the side edges of the other connecting parts. The sheet material provided with water-imperviousness, one end of the sheet material exposed from the portion not embedded in the ground, and the other end near the lower end of the sheet material. And a contact body provided so as to conduct with the conducting body in the vicinity of the lower end of the conducting body, and the conducting body is electrically connected to the conducting body. When the connection part in the vicinity of the conductive body is appropriately connected to the connection part of the adjacent vertical water-impervious sheet, a contact body provided in the vicinity of the connection part of the adjacent vertical water-impervious sheet; A vertical water shield that is configured to conduct. Door. The said electrically conductive body is a vertical water-impervious sheet | seat of Claim 4 distribute | arranged so that the both connection parts vicinity of the said sheet | seat material may be followed along the said connection part. 6. The vertical water-impervious sheet according to claim 4 , wherein each of the conductive bodies is arranged so that both end portions thereof are exposed from the vicinity of both side edge portions of the upper edge portion of the sheet material. The vertical water-impervious sheet according to claim 4 , wherein at least a part of the conductive body is embedded in the sheet material. The sheet material is for connecting a substantially rectangular sheet base material and another connecting member, is a separate member from the sheet base material, and is attached along both edge portions of the sheet base material. Each of the connection members is disposed so as to be exposed from the upper end portion of the connection member and to extend near the lower end portion of the connection member. vertical water shield sheet according to claim 4, wherein. One of the connecting members has a receiving portion that is a groove that becomes wider toward the inside, and the other of the connecting members is translated along the longitudinal direction and inserted into the receiving portion. and comprising a bulging portion which is shaped to be retaining when the, vertical water shield sheet according to claim 8. The vertical impermeable sheet according to claim 9 , wherein at least one of the contact bodies is formed of a metal plate. Along with the both side edges, there are provided connection portions that connect to other connection portions, and one end is exposed from the sheet material provided with water-imperviousness and the portion of the sheet material that is not embedded in the ground. And a conductor disposed so that the other end is positioned near the lower end of the sheet material, and a contact body provided so as to be electrically connected to the conductor near the lower end of the conductor. And when the connecting portion in the vicinity of the conducting body to which the conducting body is connected is appropriately connected to the connecting portion of the adjacent vertical water shielding sheet, the adjacent vertical water shielding Constructed by embedding a vertical water-impervious sheet that is configured to conduct with a contact body provided near the connection part of the sheet, with the lower part embedded in the ground with the side edges of adjacent ones connected. To check the soundness of the impervious walls A method of inspecting,
Including the step of measuring the resistance between the one ends of the two conductors respectively provided in the vicinity of the connection portion of the two adjacent water-impervious sheets of the water-impervious wall that are connected to each other.
Inspection method for impermeable walls.

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