JP3409016B2 - Waterproof sheet, joint structure of waterproof sheet and waterproofing construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet for covering a base made of concrete or the like, a joint structure for the waterproof sheet, and a waterproof construction method.

[0002]

2. Description of the Related Art For example, in a construction for waterproofing a floor such as a rooftop of a building by using a waterproof sheet, waterproof sheets formed into a desired shape such as a belt or a rectangle are laid out and a gap between adjacent waterproof sheets is sealed. And tape work. Also,
It is also practiced to obtain a more reliable waterproof performance by coating a laid waterproof sheet with a liquid waterproof material such as urethane resin and laminating a waterproof coating film on the waterproof sheet.

The waterproof sheet is generally formed of asphalt, rubber asphalt, vinyl chloride, rubber, polyethylene or the like as a main material, and adjacent waterproof sheets are joined together by overlapping edges of the waterproof sheets. It is common to let them join together. The edges of the waterproof sheets that have been overlapped with each other are bonded by adhesives, liquid-bonding with a solvent, heat fusion, and a fixing screw (anchor pin) that has penetrated through the edges of the waterproof sheet and reached the base to form a joined state. It is normal to maintain.

However, as described above, in the joint portion in which the edges of the waterproof sheets are simply overlapped, the thickness of the waterproof sheets overlapped from the outside so as to cover the edge of the waterproof sheet on the base side becomes a step. However, there are problems that it may look unattractive and that it may easily peel off after many years of use. In addition, there is a problem that the protruding size of the joint portion from the base becomes large, which affects the aesthetics and interferes with walking. In view of this problem, for example, FIGS.
As shown in FIG. 1, a joining structure has been proposed in which the adjacent waterproof sheets 1 and the thin portions 2 and 3 respectively formed at the edges are overlapped. In this joint structure, by adjusting the total thickness of the thin portions 2 and 3 to be equal to or less than the thickness of the waterproof sheets 1 and 1, the joint portion 5 formed by superposing the thin portions 2 and 3 The protruding size from the base 4 can be easily suppressed.

The thin portions 2 and 3 are obtained, for example, by molding. At the boundary between the waterproof sheet 1 and the other portions, step portions 6 and 7 corresponding to the difference in thickness are formed. The boundary between the stepped portion 6 of the thin portion 2 on the base 4 side and the tip 3a of the thin portion 3 superposed on the thin portion 2 is sealed by a sealing material (not shown). The shape of the waterproof sheet 1 is appropriately adjusted by cutting or the like according to the floor area to be laid, the shape of the laid floor surface, etc., and the gap 8 between the tip 3a of the thin portion 3 is not formed as much as possible. To do so.

[0006]

However, as shown in FIG.
In the joint structure as shown in FIG. 9, the reduction of the gap 8 by adjusting the dimensions of the waterproof sheet 1 is a laborious work, and even after the dimensions are adjusted, the unevenness, the curvature, the water gradient, etc. of the surface of the base 4 cause. It is difficult to completely eliminate the occurrence of the gap 8 due to an error, and in many cases, the gap 8 is wide open. Also, if an object is caught in the gap 9 between the tip of the thin portion 2 on the base 4 side and the stepped portion 7 of the waterproof sheet 1 overlaid on the upper side, or a small protrusion on the base 4 enters, a gap is formed. 8 easily expands. The wide open gap 8 takes a lot of time and labor for the sealing work, and eventually hinders shortening of the entire waterproofing work period and cost reduction.

The present invention has been made in view of the above-mentioned problems, and (1) it is possible to reduce the projecting dimension (sheet adhered thickness) of the portion (joint portion) where adjacent waterproof sheets are superposed from each other. (2) Even if the stacking position of the waterproof sheet to be joined to the underlying waterproof sheet changes, it is difficult to form a gap between the waterproof sheets, and excellent waterproofness can be secured. (3)
Between the joined waterproof sheets, a waterproof sheet and a joined structure of the waterproof sheet exhibiting an excellent effect that air permeability can be easily ensured by communicating the ventilation grooves on the lower surface of each waterproof sheet, and (4) the joined waterproof sheet Make it easier to energize between the conductor layers, and check for defects such as pinholes in the waterproof coating formed by coating a liquid waterproof material on these waterproof sheets continuously over multiple waterproof sheets. It is an object of the present invention to provide a waterproof construction method that enables the above.

[0008]

The waterproof sheet according to claim 1 is a waterproof sheet for covering an underlayer made of concrete or the like, and the taper of which the thickness is gradually reduced from the central portion side in the sheet surface direction to the outer side. -Shaped overlapping part is provided at the edge, and a ventilation groove is formed on the lower surface of the seat facing the base
And the communication groove communicating with this ventilation groove is
It is characterized in that it is formed on the lower surface facing the base . This waterproof sheet is separated by overlapping the overlapping portions so as to cover the edges of the waterproof sheet that does not have the overlapping portions, or by overlapping the overlapping portions with respect to the waterproof sheets having similar overlapping portions. Basically, it is joined with the waterproof sheet of. In this case, due to the taper-shaped overlapped portion of which the thickness dimension changes, between the joints of the waterproof sheets and the other portions, the thickness of the sheet adhered on the base (for the two joints, The total thickness of the waterproof sheet becomes the sheet adhered thickness), and the level difference does not occur at all. Moreover, since the overlapping portion to be overlapped with the other waterproof sheet is formed thinner than the other portions of the waterproof sheet, it is possible to suppress the sheet deposition thickness on the base of the joint portion between the both waterproof sheets. Since the shape-following property with respect to the waterproof sheet on the base side is excellent, there is an advantage that it is easy to secure waterproof performance due to close contact. In addition, the joining target of this waterproof sheet is not limited to the waterproof sheet, and includes, for example, various equipment projecting on the base, rising parts such as parapets of a building roof, etc. However, it is easy to stack the overlapping portions while suppressing the step and ensuring the waterproof property.

In the waterproof sheet according to the present invention, it is more preferable to adopt the following constitution. According to a second aspect of the present invention, in the waterproof sheet according to the first aspect, an elastomer layer made of an elastomer such as asphalt, rubber asphalt, vinyl chloride, rubber or polyethylene is provided on the lower surface side of the sheet, and the overlapping portion is the elastomer. The layer is formed in a taper shape, and the ventilation groove and the communication groove are grooves formed in the elastomer layer. The invention according to claim 3 is the same as claim 1 or
The waterproof sheet according to the second aspect is characterized in that a display is provided on the surface of the sheet facing the lower surface of the sheet, the display being a guide for the overlapping position of the overlapping portion of another waterproof sheet.

In the joining structure of the waterproof sheets, one or both of which is the waterproof sheet according to the present invention, it is preferable to adopt the following joining structure. The invention according to claim 4 is a joint structure of a waterproof sheet for joining between a plurality of waterproof sheets covering a base made of concrete or the like,
3. The waterproof sheet according to any one of 3 above is overlapped with each other. According to this invention, since a joint portion in which the tapered overlapping portions are overlapped with each other is formed, between the joint portion and the other portion of the waterproof sheet,
It is possible to have the same or almost no change in the sheet deposition thickness on the substrate. Further, even if there is a difference in the sheet adhered thickness on the base between the joint between the waterproof sheets applied to the base and the portion other than the joint of the waterproof sheet, the change in the sheet adhered thickness is extremely gentle. It does not cause a step.

According to a fifth aspect of the present invention, the lap portion of the waterproof sheet arranged on the base side is fixed to the base by an anchor pin penetrating the lap portion and driven into the base, and the lap portion on the base side is fixed. It is characterized in that a portion including the anchor pin driving position is concealed by superimposing the overlapping portion of another waterproof sheet. According to the present invention, the anchor pin driving position of the base-side overlapping portion is hidden by the overlapping portion of another waterproof sheet that is overlapped so as to cover the overlapping portion. Adhesive between the overlapping parts with adhesive,
The watertightness can be easily ensured by applying a sealing material, sealing by filling, or the like, so that the waterproofness at the anchor pin driving position can be easily and reliably ensured. Further, the overlapping portion for concealing the anchor pin driving position has a function of preventing the anchor pin from coming off, tilting, deforming or the like due to an impact force or a pulling force. Further, the overlapping portion for concealing the anchor pin driving position, by covering the anchor pin, exerts a bad influence (protrusion, etc.) on the coating film (waterproof coating film) of the liquid waterproof material formed on the waterproof sheet having a plurality of bonded sheets. It also functions to prevent this. Further, for example, when the waterproof coating film is not separately provided on the waterproof sheet, there is an advantage that the appearance is secured by the exposure prevention (concealment) of the anchor pin driving position by the overlapping portion.

A sixth aspect of the present invention is a waterproof sheet joining structure for joining a plurality of waterproof sheets that cover a base made of concrete or the like, wherein the waterproof sheet joining structure is as set forth in any one of the first to third aspects . The overlapping portion of the waterproof sheet is overlapped so as to cover the edge portion of the underside waterproof sheet from the outside, and a ventilation groove formed on the lower surface of the underside waterproof sheet facing the underside,
It is characterized in that it communicates with the communication groove on the lower surface of the overlapping portion so as to allow ventilation. When the overlapping part of the waterproof sheet is overlapped with the edge of the waterproof sheet on the base side, the position of the communication groove on the overlapping part side is adjusted and communicated with the ventilation groove of the waterproof sheet on the base side. As a result, the ventilation grooves on the lower surfaces of the two waterproof sheets to be joined can be easily communicated with each other so as to allow ventilation. As a result, a flow path for exhausting a gas such as water vapor generated from the base is formed by the ventilation grooves that are in communication with each other.

[0013] waterproofing execution method of a seventh aspect, claim 1
To 3 of the waterproof sheet on the base side of the waterproof sheet so as to cover the edge portion of the waterproof sheet from the outside so that the conductive layers provided in the waterproof sheets are in a laminated state. After joining the sheets and forming a waterproof coating film by coating a liquid waterproof material on the joined waterproof sheets, between the electrodes arranged on the surface of the waterproof coating film and the conductor layer of the waterproof sheet. It is characterized in that the discharge occurrence point is detected by the applied voltage. In this waterproof construction method, by checking the presence or absence of a discharge location by the applied voltage between the electrode arranged on the waterproof coating formed on the waterproof sheet and the conductor layer of the waterproof sheet, the pinhole of the waterproof coating is detected. For example, it can be confirmed whether there is a defect that causes water leakage. The waterproof coating film that is formed by spraying a liquid waterproofing material onto the waterproof sheet, applying it, and then curing it may have no conductivity or that forms a layer (coating film) with extremely low conductivity. Adopted. If the waterproof coating has a sufficient film thickness, the waterproof coating will electrically insulate the electrodes arranged on the waterproof coating from the conductor layer of the waterproof sheet, and pinholes, etc. At a location where the waterproof coating film does not exist, such as a scratch formed due to such a cause, discharge is caused to occur between the electrode and the conductor layer by the applied voltage. Accordingly, by detecting the occurrence of the discharge, it is possible to detect the presence of the defective portion such as the pinhole. As a result of changing the installation position of the electrode and checking the presence / absence of a discharge location over the entire waterproof coating, if no discharge location is found anywhere, there is no defective location such as a pinhole or scratch on the entire waterproof coating. It can be seen that the coating layer is secured. Further, by repairing the found defective portion, even a waterproof coating film formed over a vast area can surely secure excellent waterproof performance.

By the way, in order to check the presence or absence of a defective portion of the waterproof coating film formed on the waterproof sheet laid on a plurality of lower grounds such as on the roof of a building, electric conductivity is ensured between the conductor layers of each waterproof sheet. Therefore, it is preferable to make the electrode function like a continuous conductor layer in order to efficiently detect a defective portion such as a pinhole in a waterproof coating film formed in a wider area. Therefore, in the present invention, a structure is adopted in which one of the waterproof sheets is overlapped with the edge of the waterproof sheet on the base to bond the waterproof sheets together, and the conductor layers of the respective waterproof sheets are laminated. As a result, the conductor layers of the respective waterproof sheets are stacked close to each other due to the taper shape of the overlapping portion, and therefore when a voltage is applied between the conductor layers of the waterproof sheet and the electrodes, the waterproof property Leakage current between the conductor layers of the sheets allows the conductor layers to be energized, and the plurality of joined conductor layers of the waterproof sheet function as one continuous conductor layer with respect to the electrodes. Can be made. As a result, for example, while the voltage is applied between the conductor layer of the waterproof sheet and the electrode, the electrode is moved along the surface of the waterproof coating film to generate a discharge point or a leakage current (or a change in leakage current). ), It is possible to continuously and efficiently detect a defective portion such as a pinhole regardless of the boundary of the waterproof sheet. The detected defective parts are repaired with a liquid waterproof material or other repair material. Thereby, it is possible to surely obtain excellent waterproof performance of the waterproof coating film.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. The waterproof sheet 10 (waterproof cushioning sheet) shown in FIGS. 1 and 2 is formed by applying an elastomer layer 12 made of asphalt or rubber asphalt to a base cloth 11 made of resin fiber or the like.
The waterproof sheet 10 is laid so that the elastomer layer 12 faces the underlayer 13 and covers the underlayer 13. In FIG. 1, the upper surface of the base 13 forms a substantially horizontal floor surface, and a plurality of waterproof sheets laid on the base 13 are joined together to be waterproofed. Further, a waterproof coating film is formed on the laid waterproof sheet 10 by spraying, coating, or the like with a liquid waterproof material made of, for example, a urethane resin, and this waterproof coating film and the waterproof sheet 10 form a waterproof layer. To be done. The waterproof sheet 10 is fixed to the base 13 by an anchor pin or the like that penetrates the waterproof sheet 10 and is driven into the base 13. As the base cloth 11 and the elastomer layer 12, those through which the anchor pin can penetrate are adopted. Further, concrete is generally used as the base 13.

The elastomer layer 12 is waterproof and has a thickness of about several mm, preferably about 2 mm. Further, a large number of protrusions 14 are formed on the lower surface side (the lower surface side of the waterproof sheet) of the elastomer layer 12 facing the base 13, and the ventilation grooves 15 formed between the protrusions 14 are meshed over the entire lower surface of the elastomer layer 12. Is formed to extend in a shape. The protrusion 14 and the ventilation groove 15 are, for example, when roll-forming the waterproof sheet 10 using a roll with a mold,
It is formed by pressing the roll mold against the elastomer layer 12. 1 and 2, the protrusion 14 has a hexagonal shape, but the shape is not limited to this, and various shapes such as a circle, a rectangle, and a rhombus can be adopted as the shape of the protrusion 14. Since the elastomer layer 12 made of an elastomer such as rubber asphalt has elasticity, when it is laid on the underlayer 13, for example, an impact generated by walking of a person on the waterproof sheet 10 is applied to the protrusion 14. It can be absorbed and buffered by elastic deformation. As a result, the waterproof sheet 10 exhibits excellent performance as a cushioning sheet.
The ventilation groove 15 also functions as a space for facilitating elastic deformation of the protrusion 14. Further, as the base cloth 11, in view of ensuring the adhesiveness of the liquid waterproof material composed of the elastomer layer 12 or urethane resin, a material composed of polyester non-woven fabric or the like is adopted.

At the edge of the waterproof sheet 10, there is provided a stacking portion 16 which is overlaid on the edge of another waterproof sheet. The overlapping portion 16 extends in a strip shape from the end surface 17 of the waterproof sheet 10 along the edge portion with a width t of 10 to 20 cm, and gradually extends outward (in the end surface direction) from the sheet surface direction central portion side. It is tapered so that the thickness dimension is reduced. In the present embodiment, in the overlapping portion 16, the thickness of the base cloth 11 does not change, but only the thickness of the elastomer layer 12 changes, and the overlapped portion 16 is formed in a tapered shape. In the vicinity of the waterproof sheet end surface 17, the elastomer layer 12 has almost no thickness.

On the lower surface side of the base end portion 18 of the overlapping portion 16 located on the central portion side of the waterproof sheet 10 facing the base 13, the communication grooves 19a, 19b communicating with the ventilation groove 15 on the lower surface of the waterproof sheet 10 are formed. (See FIG. 2) are formed.
Specifically, two types of communication grooves 19 are provided in the base end portion 18.
a and 19b are provided, and one communication groove 19a is
A groove extending perpendicularly to the extending direction of the edge portion of the waterproof sheet 10 on the lower surface side of the elastomer layer 12, and is continuously provided in parallel along the edge portion of the waterproof sheet 10. The other communication groove 1
9b is a communication region 19 adjacent to the communication groove 19a on the lower surface side of the waterproof sheet 10 on the outer side in the surface direction of the waterproof sheet 10.
It is a groove secured between a plurality of small projections 19d provided on the c, and is communicated with the ventilation groove 15 through the communication groove 19a. The communication groove formed in the seat base end portion 18 is
It is needless to say that the communication grooves 19a and 19b illustrated in FIG. 2 are not limited and other configurations can be adopted. However,
As the communication groove, a structure that is in communication with the ventilation groove 15 is adopted. Further, the communication groove formed in the base end portion 18 may be only one of the communication grooves 19a and 19b illustrated in FIG. 2, and in the following description, the communication groove provided on the lower surface side of the base end portion 18 will be described. 19a and 19b may be collectively referred to as "communication groove 19". 1 and 2, each communication groove 1
The length of 9a is about 20 to 30 mm, but the length is not limited to this, and for example, the communication groove 19a may reach the waterproof sheet end surface 17 and the communication groove 19b may be omitted.

Embodiments of the waterproof sheet joining structure according to the present invention will be described below with reference to examples.

(First Embodiment) FIG. 3 is a diagram schematically showing a joint structure of the overlapping portions 16 of the waterproof sheet 10.
(A) is a plan view, (b) is a front sectional view showing a state in which the overlapping portions 16 having the same shape are substantially aligned and overlapped with each other, (c)
FIG. 4 is a front cross-sectional view showing a state in which only the vicinity of the tip of the overlapping portion 16 of the waterproof sheet 10 is overlapped. FIG. 3 (a),
As shown in (b), when the overlapping portions 16 having the same shape (the width dimension t, the change in the thickness dimension and the like are the same) are made to substantially coincide with each other and are overlapped with each other, the joint portion 2 in which the overlapping portions 16 are overlapped with each other.
Since the whole of 1 has substantially the same thickness dimension as the waterproof sheet 10, the waterproof sheets 10 can be joined substantially flush with each other without a step.

At the joint portion 21, one of the waterproof sheets 10 is provided.
(Hereinafter, this is referred to as a waterproof sheet 10a for convenience of description.)
The overlapping portion 16 of another waterproof sheet 10 (hereinafter, referred to as a waterproof sheet 10b for convenience of description) is overlapped on the overlapping portion 16 on the base 13 side. Both waterproof sheets 10 to be joined
In both a and 10b, the elastomer layer 12 is used as the base 13
Since it is laid toward the side, the overlapping portion 16 on the base 13 side
The elastomer layer 12 of the overlapping portion 16 of another waterproof sheet 10b is overlaid on the base fabric 11 of FIG.

Since the elastomer layer 12 made of asphalt, rubber asphalt or the like has self-adhesiveness, when the elastomer layer 12 of the overlapping portion 16 of another waterproof sheet 10b is superposed on the waterproof sheet 10a, it is in a semi-adhesive state. Displacement is less likely to occur, and after positioning, the waterproof sheet 10a,
It is possible to prevent positional displacement until fixing work is performed with the anchor pin 10b or the like. In addition, it goes without saying that the waterproof property of the joint portion 21 is ensured because the elastomer layer 12 comes into close contact with the contacting side. The overlapped portions 16 may be adhered to each other with an adhesive. In addition, the boundary 22 (the waterproof sheet 10 where the overlapping portions 16 are overlapped with each other)
The boundary between the end surface 17 of b and the waterproof sheet 10a) is preferably water-tight with a sealing material or the like separately. With this sealing material, the end surface 17 of the waterproof sheet 10b and the base 13 are
It is easy to completely eliminate the step by filling the step between the side waterproof sheet 10a.

In the joining structure shown in FIG. 4, the overlapping portion 16 of the waterproof sheet 10a arranged on the base 13 side is replaced by the overlapping portion 16
It is fixed to the base 13 by an anchor pin 29 penetrating through the base and driven into the base 13, and the superposed part 16 of the waterproof sheet 10b is superposed on the superposed part 16 of the waterproof sheet 10a. Since the flange portion 29a of the anchor pin 29 is arranged on the overlapping portion 16 of the waterproof sheet 10a on the side of the base 13, the flange portion 29a presses the overlapping portion 16 against the base 13 so as not to float. When the driving position of the anchor pin 29 is concealed by overlapping the overlapping portions 16 of the waterproof sheets 10a and 10b,
The anchor pin 29 can be protected from the action of external force such as impact force and the change of weather. Further, the joint portion 21a
Is sealed by overlapping the overlapping portions 16 with each other, and excellent waterproofness can be easily and surely secured. Therefore, the anchor pin 2 can be used without special work such as injecting a sealing material.
There is also an advantage that the waterproof property in the vicinity of the driving position of 9 can be easily ensured. An excellent waterproof property can be easily ensured by sealing the space between the overlapping portions 16 with an adhesive or a sealing material. The overlapping portion 16 that is concealed by covering the driving position of the anchor pin 29 from the outside is the elastomer layer 1
Since the thickness of the flange portion 29a on the overlapping portion 16 and other protrusions of the anchor pin 29 can be absorbed by the cushioning performance of No. 2, there are few steps or irregularities on the surface side of the overlapping portion 16 (or there is no such difference). ) A smooth surface can be obtained. Thereby, the waterproof sheets 10a, 10b
It is also easy to obtain a flat surface on the waterproof coating film formed above.

For example, the anchor pins 29 for fixing the waterproof sheets 10a and 10b to the base 13 are all driven.
If the joining portion 21a is used, the waterproof sheet 10a, without exposing the anchor pin 29 at all,
10b can be fixed to the base 13. Moreover, as described above, since the anchor pin 29 can be protected at the joint portion 21a and the waterproof property at the driving position can be easily secured, it is excellent as an entire waterproof lining layer formed by joining a plurality of waterproof sheets. Waterproof performance is secured. In this case, the portions of the waterproof sheets 10a and 10b located between the joint portions 21a do not need to be integrally fixed to the base 13, and the base 13
It is also possible to allow a slight displacement with respect to.
If the portions of the waterproof sheets 10a, 10b located between the joints 21a are displaceable with respect to the base sheet 13, there is no risk that the deformation of the base sheet 13 will be transmitted to the waterproof sheets 10a, 10b. It is possible to avoid the deformation and cracking of the waterproof coating film formed on, and to maintain excellent waterproof performance.

On the entire lower surface of the waterproof sheet 10a and the entire lower surface of the waterproof sheet 10b excluding the overlapping portion 16, the elastomer layer 12 in contact with the base 13 is in a so-called semi-adhesive state due to the self-adhesiveness of the elastomer layer 12, Displacement is prevented. The overlapping portion 16 of the waterproof sheets 10a and 10b is
Since the elastomer layer 12 is thin and has excellent flexibility as compared with the main body portion 24 of the waterproof sheets 10a and 10b, the overlapping portion 16 of the waterproof sheet 10a is deformed and comes into close contact with the underlayer 13 so as to follow, and the waterproof sheet The overlapping portion 16 of 10b is deformed and closely contacts the overlapping portion 16 of the waterproof sheet 10a.

By the way, the overlapping work of the overlapping portions 16 of the waterproof sheets 10a and 10b is carried out by the respective waterproof sheets 10a and 10b.
Although the work is performed while looking at the base fabric 11 side of a and 10b, and the communication groove 19 which is a guide of the overlapping base end portion 18 cannot be visually confirmed, the surface of the base fabric 11 facing the lower surface of the waterproof sheet 10a, 10b (waterproof). The position of the overlapping portion 16 of each waterproof sheet 10a, 10b can be confirmed by using the indicators 23a, 23b provided on the sheet surface) by printing or the like as a guide (FIG. 3).
In (a), the illustration of the display on the waterproof sheet 10b side is omitted). In FIG. 3A, one display 23a
Is provided on the surface of the base cloth 11 (the surface of the waterproof sheet) corresponding to the communication groove 19, and the other display 23b is provided at a position of several tens of mm from the display 23a toward the end surface 17 of the waterproof sheet. As shown in FIGS. 3 (a) and 3 (b), the base cloth 1 near the overlapping portion 16 of the waterproof sheet 10 a on the base 13 side or in the vicinity thereof.
If the end surface 17 of the waterproof sheet 10b is positioned and the overlapping portion 16 is overlapped in the range between the two lines 23a and 23b, which are two lines printed separately from each other on one surface, the joint area between the overlapping portions 16 is increased. Is secured and sufficient waterproofness can be secured, and the joint 21 and the waterproof sheet 10 on both sides thereof are secured.
There is little or no step between a and 10b. In this joined state, the joined waterproof sheets 10a, 1
If a liquid waterproof material made of urethane resin or the like is applied on the surface 0b, a smooth finished surface without steps can be easily obtained. The fact that there is no step or that there is no step also contributes to the improvement of the efficiency of the liquid waterproof material coating operation itself.

As shown in FIG. 1, the display 23c provided on the surface of the base fabric 11 is also provided by printing or the like, but unlike these displays 23a and 23b, it is a standard of the coating thickness of the liquid waterproof material. It will be. That is, here, the target film thickness is secured by using a translucent liquid waterproofing material and checking the degree of concealment of the display 23c. When the display 23c can be visually confirmed through the coating film of the liquid waterproof material, the coating thickness of the liquid waterproof material is insufficient.
Buried and hidden so that c could not be visually confirmed,
It is preferable to obtain the required coating thickness. As a result, it is possible to prevent the occurrence of an extremely thin portion of the liquid waterproof material coating film, and
It is possible to reliably ensure waterproofness on the entire floor above. Display 23
Other than printing, a and 23b can also be formed by, for example, adhering an adhesive tape or spraying paint.

As shown in FIGS. 3 (a) and 3 (b), when the end face 17 of the waterproof sheet 10b is aligned with the display 23a on the base end 18 side of the waterproof sheet 10a, the overlapping portions 16 are substantially aligned with each other. As a result, they are overlapped with each other and a joined state with almost no step is obtained. End surface 17 of the waterproof sheet 10b
Is aligned with the display 23b on the end face 17 side of the waterproof sheet 10a, only the tip portion (near the end face 17) of the overlapping portion 16 is overlapped, and a slight depression is formed in the vicinity of the joint portion 21, as shown in FIG. 3 (c). However, between the joint portion 21 and the waterproof sheets 10a and 10b on both sides of the joint portion 21, the thickness of the sheet adhered on the underlayer 13 changes gently due to the taper shape of the overlapping portions 16, and there is almost no step. Moreover, by burying the joint portion 21 by applying the liquid waterproof material, it is possible to easily obtain a smooth finished surface without a step. The small number of steps also contributes to improving the efficiency of the coating work of the liquid waterproof material. In order to obtain sufficient waterproofness, the overlapping width (distance between the end faces 17 of the waterproof sheets 10 that are overlapped with each other.
The overlapping width L1 in (b) and the overlapping width L2 in FIG.
It is necessary to secure 0 mm or more. Waterproof sheet 10
The overlapping width varies depending on the overlapping position of the overlapping portion 16 of the waterproof sheet 10b joined to a.

Further, when the overlapping portions having different sizes are overlapped with each other, although not shown, for example, an overlapping portion having a width dimension t larger than that of the overlapping portion on the base 13 side is on the underlying 13 side. There are cases in which the waterproof sheet is superposed on the main body of the waterproof sheet, and even in such a case, due to the taper shape of the overlapping section, the joint section and the waterproof sheets on both sides of the joint section are formed. Between the main body portion and the main body portion, the thickness of the adhered sheet gently changes, and no step is formed.

This joint structure has a waterproof sheet 10 to be joined.
a and 10b, the tapered overlapping portions 16 are superposed on each other so as to be laminated on the base 13, and are joined together.
Moreover, as can be seen from the comparison of FIGS. 3B and 3C, the overlapping portions 16 having the same shape are not completely coincident with each other, and even in a joined state in which only a part of the overlapping portions 16 are overlapped, There is no gap between the edge of the waterproof sheet 10a on the side of the base 13 and the overlapping portion 16 of the waterproof sheet 10b superposed on the waterproof sheet 10a, and excellent waterproofness is surely obtained. Therefore, even if the overlapping width of the waterproof sheets 10a and 10b varies depending on the positional relationship between the waterproof sheets 10a and 10b, the display 23
As long as the overlapping width does not become abnormally large or extremely small to deviate from the range between a and 23b,
It is possible to proceed with the joining work without performing the readjustment of the dimensions by cutting the waterproof sheets 10a, 10b and the like, and moreover, it is possible to surely obtain excellent waterproofness.

(Second Embodiment) FIGS. 5 (a), 5 (b),
As shown in (c), in the bonding structure of this embodiment, the base 1
The edge portion 27b of the waterproof sheet 27 is joined to the edge portion 27b of the waterproof sheet 27 by covering the edge portion 27b of the waterproof sheet 27 so as to cover the edge portion 27b.
The thickness dimension from 7b to the main body portion 27a of the waterproof sheet 27 is constant. The waterproof sheet 27 is different from the waterproof sheet 10 only in that it has no overlapping portion, and other configurations are the same as those of the waterproof sheet 10. Between the edge portion 27b of the waterproof sheet 27 and the overlapping portion 16 of the waterproof sheet 10,
You may adhere | attach using an adhesive agent.

A linear display 23d is provided on the base cloth 11 at the edge 27b of the waterproof sheet 27. A joint portion 28 formed by overlapping the edges of both the waterproof sheets 10 and 27.
Then, the overlapping portion 16 of the waterproof sheet 10 is overlapped with the end surface 17 of the waterproof sheet 10 near the display 23d. Thereby, the ventilation groove 15 of the waterproof sheet 27 and the communication groove 19 of the waterproof sheet 10 come close to each other, and the communication groove 1
The ventilation grooves 15 of both the waterproof sheets 10 and 27 communicate with each other through 9 so as to allow ventilation. As a result, various gases such as water vapor generated from the underlayer 13 and gases generated from the water-based bond applied on the underlayer 13 are protected from the waterproof sheets 10, 27.
A flow path for guiding air to a deaerator (not shown) from between the underlayer 13 and the underlayer 13 can be formed by the communicating ventilation groove 19. Similarly, when a large number of waterproof sheets are continuously joined so that the ventilation grooves communicate with each other, the gas on the lower surface side of each waterproof sheet can be efficiently degassed, and a plurality of waterproof sheets can be used together. By sharing two deaerators, the number of deaerators installed can be reduced.

If the overlapping position of the overlapping portion 16 of the waterproof sheet 10 with respect to the edge portion 27b of the waterproof sheet 27 is within a range of several mm from the display 23d of the waterproof sheet end surface 17, the ventilation groove 1
It is possible to make 5 communicatively connectable. The overlapping width of the waterproof sheets 10 and 27 (distance between the end surfaces 17 and 27c of the waterproof sheets 10 and 27 that are overlapped) is 7
It goes without saying that if 0 mm or more is secured, the waterproof performance is secured at the joint between the waterproof sheets 10 and 27. Moreover, due to the tapered shape of the overlapping portion 16 of the waterproof sheet 10, the base 13 is formed between the joint portion 28 and the main body portions 24, 27a of the waterproof sheets 10, 27 on both sides of the joint portion 28.
Since the thickness of the upper sheet is gently changed, it has an excellent aesthetic appearance and does not interfere with human walking.

However, in the vicinity of the end surface 27c of the waterproof sheet 27, due to the difference in position between the surface facing the lower surface of the waterproof sheet 17 facing the underlayer 13 side and the surface of the underlayer 13, the overlapping portion of the waterproof sheet 27 may be different. 16 has a slight step. However, this step difference is mitigated by the taper shape of the overlapping portion 16 as compared with the case where the edge portions 27b are overlapped with each other, and therefore becomes minute in appearance. Further, when a liquid waterproof material made of urethane resin or the like is applied onto the waterproof sheets 10 and 27 which have been joined, it is easy to bury the entire joined portion 28, and a flat finished surface can be obtained regardless of the above-mentioned step. Obtainable.

If the waterproof sheet 10 has a structure in which the overlapping portion 16 is provided only on the edge portion on one side and the overlapping portion 16 is not provided on the edge portion on the opposite side, the edge portion on the side where the overlapping portion 16 is not provided. Can be regarded as the edge portion 27b of the waterproof sheet 27 described in the present embodiment, and in this case, the plurality of waterproof sheets 10 can be continuously joined via the joining portion 28. In this case, by the same work, the work of joining a large number of waterproof sheets 10 can be efficiently advanced, and the work period can be shortened. In addition, generally, in a construction site where waterproofing is performed using a large number of waterproof sheets, in addition to the joint portion 28 described in the present embodiment, various types of joint structures described in the first embodiment are appropriately adopted. Although the waterproof sheets will be joined together, if the joining structure described in the first and second embodiments is adopted, the overlapping width between the waterproof sheets can be changed. It is possible to efficiently carry out the joining work by reducing the number of steps as much as possible, and it is possible to shorten the construction period and reduce the cost.

(Third Embodiment) FIG. 6 is a graph of FIG.
Waterproof sheet 10 joined by the joining structure shown in (c)
It is a figure which shows the state which formed the waterproof coating film 30 by spraying and apply | coating a liquid waterproofing material on a and 10b, Comprising: It is sectional drawing which shows especially the junction part 21 vicinity. At the joint portion 21 and its vicinity, since there is almost no step due to the overlapping of the overlapping portions 16 of the waterproof sheets 10a and 10b, the waterproof coating film 30 can be formed without any step, and the waterproof coating film 30 has a smooth surface. A smooth surface is obtained.

FIG. 7 shows a waterproof sheet 10 (waterproof sheet 10
It is sectional drawing which shows a, 10b). In FIG. 7, a base fabric 11 of a waterproof sheet 10 includes a reinforcement layer 11a (glass cloth or the like) adhered to an elastomer layer 12 made of asphalt or rubber asphalt, and a conductor laminated on the reinforcement layer 11a. The layer 11b and the surface cloth 11c laminated on the conductor layer 11b are adhered and integrated. Between the conductor layer 11 and the reinforcement layer 11a, the conductor layer 1
If necessary, a binder layer is provided between 1b and the outer cloth 11c in order to secure adhesive strength and dimensional stability for restraining the behavior of the liquid waterproof material or its coating film due to temperature change. It is provided as appropriate. As the reinforcement layer 11a, it is preferable to use glass cloth or the like from the viewpoint of dimensional stability and the like. As the conductor layer 11b, one having an excellent conformability to the base during sheet winding and construction is suitable, and for example, aluminum foil or the like is adopted. The conductor layer made of aluminum foil can satisfy all the above-mentioned properties required for the conductor layer. Table cloth 11
For c, the adhesiveness of a liquid waterproof material is also required. For example, a urethane waterproof material made of polyester nonwoven fabric is used. Needless to say, the structure of the waterproof sheet 10 shown in FIG. 7 is also applicable to the waterproof sheets used in the joining structures of the first and second embodiments described above.

(Waterproof construction method) In FIG. 6, reference numeral 31 is an electrode. A waterproof coating film 30 made of urethane waterproof material or the like having no conductivity (or very low conductivity) is used as the waterproof sheet 1.
0a, 10b, a voltage is applied between the electrode 31 and the conductor layer 11b of the waterproof sheet 10a, 10b, which are formed close to the surface of the waterproof coating film 30, and by the applied voltage,
For example, if the waterproof coating film 30 has pinholes, a discharge is generated between the electrode 31 and the conductor layer 11b. Therefore, the presence of pinholes can be detected by electrically or visually detecting this discharge. Not limited to pinholes, for example, flaws such as scratches on the waterproof coating film 30 where the waterproof coating film 30 is not reliably formed can be detected by detecting discharge between the electrode 31 and the conductor layer 11b. The electrical detection of discharge is, for example, a test device 32 that is electrically connected to the electrode 31 or the conductor layer 11b and has a function of applying a voltage for detecting a defective portion between the electrode 31 and the conductor layer 11b. From the above, it is to notify the occurrence of the discharge by a notification means such as voice or blinking of a lamp based on the change of the current value due to the occurrence of the discharge. The visual detection of discharge is, for example, to visually confirm an arc generated by the discharge. For example, the electrode 31 and the conductor layer 1
When a voltage of about 20,000 V is applied between 1b and 1b, a discharge arc of a visually easy degree is generated at a defective portion such as the pinhole (where the waterproof coating film 30 does not exist).
The visual detection is facilitated.

Conductor layer 11 of waterproof sheets 10a and 10b
The electrode 31 brought into close proximity to the electrode 31b while applying a voltage
By moving along the surface of the waterproof coating film 30, defects such as pinholes of the waterproof coating film 30 can be detected efficiently in a short time in a wide range. As a result, even minute defects such as pinholes can be easily found, and excellent waterproof performance can be reliably obtained by repairing the found defective parts.
By the way, in the joint portion 21 shown in FIG. 6, the waterproof sheet 1 superposed on the waterproof sheet 10a on the base 13 side.
Since the thickness of the overlapping portion 16 of 0b is smaller than that of other portions of the waterproof sheet 10b, the base fabric 11 of the overlapping portion 16 of the waterproof sheet 10b approaches the base fabric 11 of the waterproof sheet 10a on the base 13 side. And then stacked. Here, when a high voltage (for example, about 20,000 V) is applied between the electrode 31 and the conductor layer 11b, a leakage current is generated between the conductor layers 11b of the base cloth 11 laminated at the joint portion 21. , Conductor layer 1
Power is supplied between the ones. In particular, since the base cloths 11 of the superposed waterproof sheets 10a and 10b can be brought close to each other near the tip of the overlapping portion 16 in the protruding direction toward the outside of the waterproof sheet 10b, it is possible to surely energize. As a result, the conductor layer 11b of the base cloth 11 of the waterproof sheets 10a and 10b joined via the joint portion 21 functions as a single conductor layer with respect to the electrode 31, and thus the waterproof sheet. By moving the electrode 31 along the surface of the waterproof coating film 30 formed on the 10a and 10b, a defective portion such as a pinhole existing in the waterproof coating film 30 can be spread over a wide range regardless of the boundary between the waterproof sheets 10a and 10b. Can be detected efficiently.

Although not shown, the second embodiment (FIG. 5)
Even when a waterproof coating film is formed on the waterproof sheets 10 and 27 joined by the joining structure (joint portion 28) described in (a) to (c)), the defective portions such as pinholes of the waterproof coating film are not removed. The detection is exactly the same as in the case of the waterproof coating film 30 of FIG. That is, the electrodes to which a voltage is applied between the waterproof sheets 10 and 27 and the conductor layer of the base cloth 11 are moved along the surface of the waterproof coating film to electrically generate the discharge generated between the conductor layers and the electrodes. Alternatively, by visually detecting, it is possible to easily detect a defective portion such as a pinhole of the waterproof coating film where the waterproof coating film 30 does not exist. Joining part 2 shown in FIGS.
8 also, the base cloth 11 of the overlapping portion 16 of the waterproof sheet 10 has the taper shape of the overlapping portion 16 so that the waterproof sheet 10 is
Since it is closer to the base cloth 11 of the waterproof sheet 27 on the side of the base 13 compared to the other portions, the electrodes arranged on the surface of the waterproof coating on the waterproof sheets 10 and 27 and the base cloth 1 of the waterproof sheets 10 and 27.
The conductive layers of the base cloth 11 of the waterproof sheets 10 and 27 are energized by an applied voltage (for example, a high voltage of about 20,000 V) between the conductive layers of 1 and the base cloth of the plurality of waterproof sheets 10 and 27. The eleven conductor layers function as one continuous conductor layer with respect to the electrodes.
It is possible to efficiently detect a defective portion such as a pinhole (here, a portion where the waterproof coating film does not exist) regardless of the boundary of the.

According to the waterproofing method of the present invention, a plurality of waterproof sheets each having a conductive layer on the base cloth 11 are laid on the base 13 so as to cover the edge of the waterproof sheet on the side of the base 13. Since the conductor layers of the base fabric of the joined waterproof sheets can be placed close to each other by the joining structure (joint portion) in which the tapered overlapping portions 16 of the other waterproof sheet 10 are overlapped, it is formed on the waterproof sheet. Waterproof coating 30
By applying a voltage between the electrode 31 disposed on the surface and the conductor layer of the waterproof sheet, the conductor layers of all the waterproof sheets joined by the joining structure can be energized. To the electrode 31 like a continuous conductor layer. As a result, by merely moving the electrode 31 along the surface of the waterproof coating film, a defective portion such as a pinhole can be detected regardless of the boundary between the waterproof sheets by detecting the discharge between the conductor layer and the electrode 31. Can detect efficiently over a wide range in a short time. The waterproof sheet joining structure according to the waterproofing method of the present invention has a structure in which conductor layers are closely laminated by superimposing a tapered overlapping portion 16 of another waterproof sheet on the edge of the underlying waterproof sheet. As long as it can be done, various configurations can be adopted,
It is not limited to the one shown in FIG.

Needless to say, the waterproof sheet and the joining structure of the waterproof sheet of the present invention are not limited to the configurations described in the above-mentioned embodiments, and various modifications can be made. For example, the material forming the elastomer layer is not limited to asphalt or rubber asphalt, but vinyl chloride,
Rubber, polyethylene, etc. can also be adopted. As the joint structure of the waterproof sheet, for example, also in the joint portion 21 shown in FIG. 3, it is possible to adopt a configuration in which the ventilation grooves of the waterproof sheet communicate with each other so as to allow ventilation. For example, in FIG.
A communication groove that reaches the tip of the overlapping portion 16 (near the end surface 17 of the waterproof sheet) is formed in the waterproof sheet 10 on the third side, and the ventilation grooves 15 of both the waterproof sheets 10 communicate with each other through the communication groove. It is possible to adopt a configuration or the like. In this case, since the elastomer layer 12 is thin at the tip of the overlapping portion 16, for example, a hole or a notch for opening the communication groove that has reached the vicinity of the tip of the overlapping portion 16 is formed in the overlapping portion 1.
It may be formed at the 6 tip. As the waterproof sheet applied to the waterproofing method according to the present invention, any waterproof sheet may be used as long as it has a conductive layer evenly over the entire surface, and various configurations can be adopted. For example, one in which the base cloth itself functions as a conductor layer, one in which a conductor layer is provided between the elastomer layer and the base cloth, one having a conductor layer in the elastomer layer, and one in which the elastomer layer itself functions as a conductor layer. It is possible to employ various configurations such as those (including those not provided with a base cloth).

[0043]

As described above, according to the waterproof sheet of the present invention, the edge portion is provided with the tapered overlapped portion whose thickness is gradually reduced from the central portion side in the sheet surface direction to the outside. Since the overlapping portion is overlapped and joined to the edge portion of another waterproof sheet, etc., between the joining portion where the overlapping portion is overlapped and joined to the other side and the periphery of this joining portion, Due to the taper shape of the overlapping portion, the thickness of the sheet adhered on the underlayer changes gently, and no step is formed. For this reason, it is possible to obtain an excellent aesthetic appearance, and it is difficult for pedestrians walking on the finished surface to get in the way.Furthermore, the liquid waterproof material makes it easy to obtain a flat finished surface, and the coating itself is easy. It has an excellent effect.

[0044] Furthermore, the the sheet lower face directed to ground the ventilation grooves are formed, since the communication groove which communicates with the ventilation grooves are formed on the lower surface directed to said base for the overlapped portion, the underlying etc. The generated gas can be exhausted from between the waterproof sheet and the base through the ventilation groove and the communication groove, so that the waterproof sheet constructed so as to cover the base can be prevented from swelling. By forming the communication groove in the overlapping part, by overlapping this overlapping part with another waterproof sheet or deaerator that can receive exhaust gas from the ventilation groove,
The ventilation groove can be communicated with each other through the communication groove, and an excellent effect is achieved that efficient exhaust can be realized.

An elastomer layer made of an elastomer such as asphalt, rubber asphalt, vinyl chloride, rubber or polyethylene is provided on the lower surface side of the sheet, and the overlapping portion is formed by tapering the elastomer layer. And, if the communication groove is a groove formed in the elastomer layer, excellent waterproof performance is obtained by the elastomer layer, and the ventilation groove and the communication groove can be easily obtained by molding the elastomer layer. It has an excellent effect that cost can be reduced.

On the surface of the sheet facing the lower surface of the sheet,
If a display is provided as a guide for the overlapping position of the overlapping portion of another waterproof sheet, it is possible to easily grasp an appropriate overlapping position that does not cause a step when overlapping another waterproof sheet. Further, it has an excellent effect that the work efficiency of joining the sheets to each other can be improved.

According to the joint structure of the waterproof sheet of the fourth aspect, the superposed portions of the waterproof sheet according to any one of the first to third aspects are overlapped with each other so that the superposed portions are overlapped with each other. Can be made flush with or substantially flush with the waterproof sheet other than the joint portion, improving the finishing workability and obtaining an excellent aesthetic appearance. Even if the overlapping width of the waterproof sheets changes to some extent, there is no gap between the waterproof sheets due to the overlapping of the tapered overlapping parts.Therefore, the overlapping width between the waterproof sheets can be changed within the range where waterproofness can be secured. As a result, it is possible to absorb the dimensional error of another waterproof sheet with respect to the overlapping portion of the waterproof sheet on the base side, the positional deviation in the actual construction, etc., so that it is possible to improve the construction efficiency of the waterproof sheet. Play.

According to the joint structure of the fifth aspect , the anchor pin driving position of the base side overlapping portion is hidden by the overlapping portion of another waterproof sheet which is overlapped so as to cover the overlapping portion. It has excellent effects such as ensuring the waterproofness of the pin driving position and preventing the anchor pin from coming off, tilting or deforming due to impact force or pulling force.

According to the joint structure of the waterproof sheet of the sixth aspect, the overlapping portion of the waterproof sheet according to the present invention is overlapped so as to cover the edge portion of the underside waterproof sheet from the outside, and the underside waterproof sheet is provided. Of the gas, such as water vapor, generated from the ground between the different waterproof sheets by communicating with the ventilation groove extendingly formed on the lower surface facing the ground and the communication groove on the lower surface of the overlapping portion so as to be breathable. Since the flow path for exhausting gas from between the base and the waterproof sheet is formed, it becomes easy to guide the gas to the exhaust position and exhaust it. In addition, it is possible to freely set the exhaust position and reduce the number of deaerators installed at the exhaust position.

According to the waterproofing method of the present invention, the presence or absence of a discharge location due to the applied voltage between the electrode arranged on the waterproof coating film formed on the waterproof sheet and the conductor layer of the waterproof sheet is checked. You can check whether there are any defects such as pinholes in the waterproof coating that may cause water leakage. According to this waterproofing method, it is possible to detect (nondestructively) the defective portion of the waterproof coating film as described above without damaging the waterproof coating film. When another waterproof sheet is overlapped on the edge of the waterproof sheet on the base and the waterproof sheets are joined together, and the conductor layers of each waterproof sheet are laminated, the conductive shape of each waterproof sheet will be changed due to the taper shape of the overlapping section. The body layers are stacked close to each other, and the applied voltage between the conductor layers of the waterproof sheet and the electrodes causes a leakage current between the conductor layers of the joined waterproof sheets to energize the conductor layers. Since the conductive layer of each of the plurality of waterproof sheets joined together can function as one conductive layer with respect to the electrode, the detection electrode can be used as the conductive layer of the waterproof sheet. By moving along the surface of the waterproof coating film while applying the electrode between the electrodes to detect the discharge location, it is possible to continuously detect defective locations such as pinholes.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a waterproof sheet of the present invention.

FIG. 2 is an enlarged perspective view of the overlapping portion of the waterproof sheet of FIG. 1 viewed from the lower surface side.

FIG. 3 is a diagram showing a first embodiment of the waterproof sheet joining structure of the present invention, in which (a) is a plan view showing a state in which overlapping portions of the same shape are substantially aligned and overlapped with each other; 8C is a front cross-sectional view, and FIG. 13C is a front cross-sectional view showing a state in which only the front end portions of the overlapping portions are overlapped with each other.

FIG. 4 is a cross-sectional view showing another embodiment of the joining structure of FIG. 3, in which the overlapping portion of the waterproof sheet on the underside is fixed to the underlayer by using an anchor.

5A and 5B are views showing a second embodiment of the waterproof sheet joining structure of the present invention, wherein FIG. 5A is a plan view, FIG. 5B is a front sectional view, and FIG.

FIG. 6 shows a waterproof coating film formed by spraying a liquid waterproof material on a waterproof sheet joined by the joining structure shown in FIGS. 3 (a) to 3 (c), and a test device for performing a pinhole test thereof. It is a figure, and is a sectional view especially showing the junction vicinity.

FIG. 7 is a cross-sectional view showing a waterproof sheet.

FIG. 8 is a perspective view showing a conventional waterproof sheet and a waterproof sheet joining structure.

FIG. 9 is a front sectional view showing a conventional waterproof sheet and a waterproof sheet joining structure.

[Explanation of symbols]

10, 10a, 10b ... Waterproof sheet, 11b ... Conductor layer, 12 ... Waterproof sheet, 13 ... Underlayer, 15 ... Ventilation groove, 1
6 ... Overlap part, 19 ... Communication groove, 23a, 23b, 23d ...
Display, 27 ... Waterproof sheet, 27b ... Edge, 29 ... Anchor pin, 30 ... Waterproof coating, 31 ... Electrode.

Claims (7)

(57) [Claims] 1. A waterproof sheet covering the base made of concrete or the like, the tapered overlapping portion gradually thickness is reduced toward the sheet surface direction central portion side to the outer side with the edge, the underlying The waterproof sheet is characterized in that a ventilation groove is formed on a lower surface of the sheet to be directed, and a communication groove communicating with the ventilation groove is formed on a lower surface of the overlapping portion facing the base. 2. An elastomer layer made of an elastomer such as asphalt, rubber asphalt, vinyl chloride, rubber, or polyethylene is provided on the lower surface side of the sheet, and the overlapping portion is formed by tapering the elastomer layer. waterproof sheet according to claim 1, wherein the ventilation groove and the communicating Tsumizo is characterized by a groove formed in the elastomeric layer. To wherein said seat bottom surface facing the seat surface, also claim 1, characterized in that the display which is a measure of the overlapping position of the overlapping portions of another waterproof sheet is provided
Is the waterproof sheet described in 2 . 4. A bonding structure for a waterproof sheet for bonding between a plurality of tarpaulins for covering the base made of concrete or the like, is superimposed is superimposed portions of the waterproof sheet according to any one of claims 1 to 3 The joint structure of the waterproof sheet, which is characterized by 5. The lap portion of the waterproof sheet arranged on the base side is fixed to the base by an anchor pin penetrating the lap portion and driven into the base, and the anchor pin driving position of the lap portion on the base side is fixed. The joint structure of a waterproof sheet according to claim 4 , wherein the portion including the portion is covered by the overlapping of the overlapping portions of another waterproof sheet. 6. A waterproof sheet joining structure for joining a plurality of waterproof sheets that cover a substrate made of concrete or the like, wherein the overlapping portion of the waterproof sheet according to any one of claims 1 to 3 is on a substrate side. The ventilation groove is formed so as to cover the edge portion of the waterproof sheet from the outside, and the ventilation groove formed on the lower surface of the base waterproof sheet facing the base, and the communication groove on the lower surface of the overlapping portion are communicably connected to each other. The joint structure of the waterproof sheet, which is characterized by 7. A conductive member provided on each of the waterproof sheets by stacking the stacked portion of the waterproof sheet according to claim 1 on the edge portion of the base-side waterproof sheet so as to cover the edge portion from the outside. After joining the two waterproof sheets with the body layer in a laminated state and forming a waterproof coating film by coating a liquid waterproof material on the joined waterproof sheets, the electrodes and the waterproof sheet arranged on the surface of the waterproof coating film. 2. A waterproof construction method characterized by detecting a discharge occurrence point due to a voltage applied to the conductor layer.