JP2006219878A - Waterproof member for corner section and waterproof construction method of corner section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof construction in a corner section of a building capable of being simply carried out by having high workability with good finish and exhibiting high waterproof function. <P>SOLUTION: In a waterproof member 10 constructed along a joint of both surfaces from the corner section constituted of surfaces in three directions, it is so constituted that it consists of a waterproof sheet excellent in expansibility and is formed in the shape of a belt, it is placed along the joint from the corner section and consists of an expansible waterproof material 20 having a cohesive layer on the back and a shape maintainable sheet, it is placed in one end in the longitudinal direction on the opposite surface of the cohesive layer of the expansible waterproof material 20 and consists of a corner section abutting piece 30 placed in the corner section and the shape maintainable sheet and that it has an expansible operating piece 40 placed over an overall width of the expansible waterproof material 20 to the end section opposed to the corner section abutting piece 30 on the opposite surface of the cohesive layer of the expansible waterproof material 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a corner waterproofing member and a corner waterproofing method, and more particularly, in a construction work, when a plurality of face materials are assembled, a corner composed of three directions and a seam extending from the corner. A waterproof member used for waterproofing and a method for performing waterproofing using such a corner waterproof member.

When constructing houses or other buildings, at places exposed to the outside such as outer walls, roofs, rooftops, etc., provide sufficient waterproofing to prevent rainwater from entering the joints or boundaries between exterior materials. It is necessary to keep.
As a general waterproofing process, a technique using a waterproof and airtight tape having a good stretch is known and widely used in practice. If a waterproof and airtight tape having an adhesive back surface is applied along the seam between the exterior materials, the seam is waterproofed. Even when the surfaces on both sides of the seam are not on the same surface and have an angle such as a right angle, the waterproof and airtight tape can be flexibly deformed so that the seam can be reliably covered and pasted.

For example, Patent Document 1 discloses a technique of a sheet-like airtight material in which an adhesive layer is laminated on an extensible holding layer made of polyethylene and polybutylene. A sheet-like airtight material is wound in a tape shape and is used by being attached along a seam composed of a plurality of surfaces.
Such a waterproof and airtight tape is easy to stick to a joint where two surfaces extend adjacently at an angle, but in the case of a corner where three orthogonal surfaces are gathered. Is difficult to paste. It is difficult for even a highly skilled engineer to attach a flat waterproof and airtight tape in close contact with a three-dimensional solid shape. Therefore, normally, waterproof waterproof air-tight tape is often repeatedly applied in a straight line along each joint between surfaces extending in a plurality of directions from the corners, so that reliable waterproofing is often achieved.

Patent Document 2 discloses a waterproof sheet technology that facilitates waterproof construction of a corner portion of a flat roof. Two waterproof sheets having a roughly triangular shape are attached to the two surfaces constituting the corner. The left and right waterproof sheets are laminated and bonded with triangular hypotenuses, so that the entire corners are waterproofed.
Japanese Patent Laid-Open No. 11-20071 No. 6-30003

In any of the prior arts described above, the waterproof construction at the corners is cumbersome and difficult.
No matter how much the belt-like waterproof tape extends, it is difficult to stick it securely to the back of the corner. In particular, when waterproofing is performed with a single waterproof tape up to the joint between the surfaces extending from the corner, the direction of the waterproof tape changes greatly depending on how the corner is deformed, and both sides of the joint are evenly distributed. It becomes difficult to extend linearly so as to cover.
The stretchable waterproof tape easily deforms the part where it is pulled or applied, so if the position, direction, or range where the force is applied to the waterproof tape changes even during the pasting operation, It is easy to get worse and to have irregularities, undulations, wrinkles, etc. If a large force is applied locally to the waterproof tape, it may become extremely thin or have holes.

Even when the waterproof tape is laminated in a plurality of directions, a gap is likely to be formed between the waterproof tapes at the back of the corner, and may be lifted. When the waterproof tape attached to the lower side at the corners is lifted, a sufficient waterproof function cannot be achieved no matter how much another waterproof tape is applied on the waterproof tape.
Even in the technique of pasting the triangle-shaped waterproof sheets described in Patent Document 2 in combination, the left and right waterproof sheets are abutted or overlapped at the back or top of the corner, so there is a gap. Or rise easily. In addition, the two waterproof sheets must be pasted in an accurate posture and position, which is difficult for an unfamiliar operator.

  An object of the present invention is to make it possible to easily perform waterproofing work at the corners of the building described above with good workability, good finish, and high waterproof function.

The corner waterproof member according to the present invention is a waterproof member constructed along a joint between surfaces from a corner constituted by three-direction surfaces, and is composed of a waterproof sheet having excellent spreadability, and has a strip shape. None, comprising a spread waterproof material disposed along the seam from the corners and having an adhesive layer on the back surface, and a shape-retaining sheet, on the opposite surface of the spread waterproof material to the adhesive layer, in the length direction A corner abutting piece disposed at one end of the corner, and a shape-retaining sheet, opposite to the corner abutting piece on the opposite surface of the adhesive layer of the spread waterproof material. A spread operation piece disposed over the entire width of the spread waterproof material is provided at the end.
[Corner]
Basically, it may be a corner where waterproof construction is required in normal building construction. Corners that require waterproofing in buildings exist in exterior structures such as flat roofs, rooftops, and eaves that are exposed to outdoor spaces.

The corner portion is usually formed by gathering surfaces in three directions orthogonal to each other. Generally, it is composed of two vertical planes orthogonal to the plane. A corner having a shape in which two vertical planes form 90 ° and is recessed may be referred to as an entrance corner, and a corner in a shape in which two vertical surfaces form a projection of 270 ° may be referred to as an exit corner. However, there are also corners in which surfaces in three directions form angles other than orthogonal, corners formed by inclined surfaces other than a plane and a vertical surface, and corners formed by curved surfaces.
If the corners are integrally formed by molding, cutting, or deforming a single member, no seam is formed, so waterproofing is unnecessary. When the corner is constituted by two or more members, it is necessary to waterproof the joint between the members.

In the corner portion constituted by the surfaces in the three directions, a joint between the surfaces extends in the radial direction from the apex or bottom point of the corner portion. The seam may extend in multiple directions.
The corner waterproof member integrally waterproofs the seam in all directions and the predetermined length of the seam extending in one direction from the apex or bottom of the corner as described above. Install.
[Expanded waterproof material]
Affixed to the corners and seams extending from the corners to provide a waterproof function.
Before construction, the whole is formed into a flat sheet shape, and is used by being deformed according to the shape of the corner or the like at the time of construction.

<Waterproof sheet with excellent spreadability>
It consists of a waterproof sheet with excellent spreadability, which is also used in ordinary waterproof sheets and waterproof tapes. Expandability is different from elastic elasticity, which stretches when force is applied and restores elastically when the force is removed in the stretched state. It means a characteristic that maintains the extended state as it is even if it is removed. As a sheet material having good spreadability, a rubber-like material having improved spreadability by combining a synthetic resin such as polyethylene and a synthetic rubber such as polybutylene is known. Specifically, EPDM rubber is mentioned.

If the elongation percentage of the waterproof sheet is appropriate, it can be easily applied along the corners and seams, and the waterproof function can be satisfactorily exhibited. Specifically, an elongation rate of 100 to 150% is preferable.
The thinner the waterproof sheet is, the easier it is to stretch and bend it, but it is easier to tear or make a hole. Therefore, the thickness can be set to 0.65 to 1.3 mm.
<Shape structure>
The spread waterproof material has a strip shape such as a substantially rectangular shape. One end side is arranged at the corner, and the other end side is arranged at a position away from the corner along the seam. The shape of the spread waterproof material is made to correspond to the shapes of the corners and joints to be constructed, the shape of the corner contact pieces and the spread operation pieces. Usually, the shape of the spread waterproof material is the shape of the corner waterproof member. In part, there may be a portion where the spread waterproof material projects outward than the corner waterproof member. In addition, in the construction state, the spread waterproof material is stretched or deformed, which is different from the shape before construction.

As a specific shape of the spread waterproof material, in addition to the rectangular shape, the end portion on the side arranged at the corner has a wedge-shaped shape, the taper shape that narrows from the corner side to the other end side, the length A shape with a step or a dent in the middle of the direction can also be adopted.
The width of the spread waterproof material can be set to 5 to 30 cm. If the width is narrow, it is difficult to reliably cover corners and seams. Even if the width is too wide, the waterproof function is not so high, it becomes difficult to handle, and the economic efficiency is impaired. The length of the spread waterproof material is set in accordance with the length from the corner to the seam to be waterproofed. The longer one can be waterproofed over a wide area at a time, and it is easy to exhibit a flexible spreading function in the spreading section described later, but it becomes difficult to handle if it is too long. Specifically, the length of the spread waterproof material can be set to 5 to 30 cm.

<Adhesive layer>
An adhesive layer is provided on the back surface of the spread waterproof material. The adhesive layer can employ the same material and structure as the adhesive layer in a normal waterproof sheet. A material having high extensibility which can follow the deformation of the waterproofing material while being highly connectable to the building members constituting the corners and seams is preferable.
Usually, an adhesive is applied to the back surface of the spread waterproof material. A double-sided pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is provided on both front and back surfaces can also be pasted. As the pressure-sensitive adhesive, it is preferable to blend a rubber material having excellent spreadability similar to the material of the waterproof sheet as the spread waterproof material.
By attaching a release sheet to the surface of the adhesive layer, handling of the spread waterproof material and the corner waterproof member such as transportation and storage becomes easy.

Conventionally, a waterproof sheet or waterproof tape known as a waterproof material product, which has an adhesive layer or a release sheet on the back surface, can be used as it is for a spread waterproof material.
(Corner contact piece)
It consists of a shape-retaining sheet, and is disposed at one end in the length direction on the surface opposite to the adhesive layer of the spread waterproof material. It is arrange | positioned at a corner part, the waterproof function of a corner part is improved, and construction of the waterproof member for corner parts is made easy. If a part of the corner abutment piece comes into contact with each of the three surfaces constituting the corner, the spread waterproof material is securely brought into contact with the corner and brought into close contact with each other, thereby achieving a good waterproof function. .
The corner abutting pieces are arranged in a flat state in the corner waterproofing member, and at the time of construction, a predetermined portion is bent in accordance with the shape of the corner to form a three-dimensional shape. In order to facilitate this bending operation, a shape-retaining sheet is used.

<Shape retention sheet>
The shape-retaining sheet has a certain degree of mechanical strength, rigidity, deformation resistance, and shape maintenance, is difficult to deform in the surface direction, and when bent, it retains the bent deformation state as it is and is elastic It is a material that is unlikely to be restored. For example, a soft metal plate is applicable. A stretched polyolefin sheet made of a polyolefin resin and greatly stretched in a uniaxial direction can also be used. When the uniaxially stretched resin sheet is bent along a line parallel to the stretching direction, the uniaxially stretched resin sheet is easily bent and the return after bending is reduced. A shape-retaining sheet made of a synthetic resin is lightweight, easy to handle and process, and has corrosion resistance. Polyolefin resin is easy to dispose of such as incineration. Polycarbonate resin can also be used as a material for the shape-retaining sheet.

The thicker the shape-retaining sheet, the higher the mechanical strength and the like. However, when the thickness is too thick, bending deformation becomes difficult. Usually, the thickness can be set to 0.65 to 1.3 mm. As a characteristic value for evaluating the shape-retaining property of the shape-retaining sheet, a bending return angle when a flat sheet is bent by 90 ° can be applied. Those having a bending return angle of 5 ° or less are excellent in shape retention and are useful as materials for the corner contact pieces.
<Fixed part, overhang part>
The shape of the corner contact piece is set according to the construction conditions such as the shape of the corner to be constructed.
For example, a fixed portion that is disposed on one surface at the corner and the side end side is disposed along the remaining surface, and that protrudes from the side end side of the fixed portion, is bent with respect to the fixed portion, and is cornered. And an overhanging portion disposed on the remaining surface of the portion.

The fixing portion has two side edges adjacent to each other, and the side edges are arranged so as to be symmetrically inclined with respect to the center line in the length direction of the spread waterproof material. However, what is arrange | positioned in strip | belt shape along each side edge of a fixing | fixed part is employable.
As the shape of the fixed portion, a relatively simple figure shape such as a square or a rectangular shape can be adopted. As the shape of the overhanging portion, a rectangular band shape or the like can be adopted. In any case, it is also possible to combine shapes such as curved portions, unevenness, and steps as required.
<Easily bent line>
An easy-bending line that facilitates bending can be provided at a portion to be bent, such as between the fixed portion and the overhang portion. The easy bending line can be applied to a technique for facilitating bending which is also employed in a normal plate material or sheet material. For example, a shallow dent line or a weak line can be employed. It is desirable to adopt a depth and shape that do not break or get a hole when bent. The easy-bending line is usually a straight line, but a gentle curve can also be adopted. Usually, it is a continuous line, but it may be an intermittent broken line. Short easy bending lines can be provided only at both ends of the bent portion.

When a uniaxially stretched resin sheet is used for the shape-retaining sheet, the material of the corner contact piece should be removed so that the direction of the bending line to be bent is parallel to the stretching direction or is not inclined as much as possible. If done, it may be easily bent without an easy bend line.
[Expansion operation piece]
Like the corner contact piece, it is made of a shape-retaining sheet and is disposed on the opposite surface of the adhesive layer of the spread waterproof material.
The spreading operation piece is disposed across the entire width of the spreading waterproof material at the end opposite to the corner contact piece. After the corner contact piece is arranged in the corner, the spread operation piece can be grasped and the spread waterproof material can be extended to a predetermined direction and position. By sticking and fixing the spread waterproof material on the back side of the spread operation piece to the construction surface, the spread waterproof material can be constructed in a predetermined position, posture and form.

The spread operation piece is arranged over the entire width of the spread waterproof material, so that the spread waterproof material can be subjected to predetermined deformation such as stretching the entire spread waterproof material. The total length of the spreading operation piece may be the same as or different from the width of the corner contact piece.
As the shape of the spreading operation piece, a relatively simple band shape or rectangular shape is usually adopted. Depending on the construction conditions, there may be more complicated irregularities, or a part of the outer shape may be configured by a curve or a bent line. A shape that can be easily stretched is preferable. Of the dimensions of the spreading operation piece, the width of the spreading operation piece in the length direction of the corner waterproofing member can be set to 5 to 50 mm, for example.

The spreading operation piece is flat when placed on the corner waterproof member, but may be bent during construction. In order to facilitate bending at this time, it is effective to use a shape-retaining sheet. In the case where the shape-retaining sheet is a uniaxially stretched resin sheet, if the bending line of the spreading operation piece is set in parallel to the stretching direction, it becomes easy to bend. In general, the spreading operation piece only needs to be subjected to a relatively simple unidirectional bending deformation. Therefore, there are many cases where it is not necessary to provide an easy-bending line. Of course, if necessary, an easy-bending line can be provided. If the spreading operation piece is divided into a plurality of parts in the width direction of the corner waterproofing member, it is easy to bend the divided parts.
[Expansion part]
In the spread waterproof material in which the corner contact piece and the spread operation piece as described above are arranged, the spread waterproof material is exposed on the surface between the corner contact piece and the spread operation piece. An extended part is generated. In the extended portion, the corner contact piece and the extended operation piece that are relatively difficult to be deformed do not exist, so that the extended waterproof material can be flexibly deformed.

The greater the proportion of the spread part, the easier the deformation of the spread waterproof material. The stretchable length of the spread waterproof material by the spread operation piece can also be increased. However, if the extension part becomes too wide, it becomes difficult to handle the waterproof member for the corner part, or problems such as inadvertent bending or excessive deformation when stretched with the extension operation piece arise.
Therefore, in the length direction of the corner waterproofing member, the length of the spread portion represented by the distance between the inner end portions of the corner contact piece and the spread operation piece can be set in a range of 1 to 30 cm, for example. .
[Manufacture of waterproof parts for corners]
The corner waterproofing member can be manufactured by applying a normal sheet processing technique.

Specifically, for example, a waterproof sheet that becomes a spread waterproof material and a shape-retaining sheet that becomes a corner contact piece and a spread operation piece are bonded together using an adhesive or a double-sided adhesive tape, and a predetermined shape is obtained. Can be punched into The shape-retaining sheet can be bonded to the waterproof sheet after being processed into the shape of the corner contact piece and the spreading operation piece. After the shape-retaining sheet and the waterproof sheet are bonded together, only the shape-retaining sheet is processed with cuts corresponding to the shapes of the corner abutting pieces and the spreading operation pieces, and the shape-retaining sheets at other locations are attached. It can also be removed.
The easy-bending line can also be pressed in the same manner as punching and cutting of the shape-retaining sheet.

[Waterproofing construction]
Using the corner waterproofing member described above, waterproofing can be performed along the joint between the surfaces from the corner constituted by the surfaces in three directions. Specifically, a method including the following steps (a) and (b) can be employed.
Step (a): The corner abutting piece of the corner waterproof member is arranged at the corner, the corner abutting piece is deformed, and the waterproofing of the back side of the corner abutting piece on all three directions is performed. Paste the material.
The flat corner contact piece is deformed into a three-dimensional shape in accordance with the three-dimensional shape formed by the three surfaces of the corner. The corner contact piece can be easily constructed at a predetermined position and posture by using the structure such as the fixed portion and the overhang portion described above and the easy-bending line provided therebetween. If the spread waterproof material is strongly pressed against the construction surface from the surface side of the corner abutment piece via the corner abutment piece, the spread waterproof material can be securely adhered to the center of the corner or the back of the joint. it can.

In the state where the corner contact piece is attached at a predetermined position and posture, the extension operation piece at the length direction of the corner waterproof member and the end in the length direction is accurately the direction of the seam extending from the corner Will turn to.
Step (b): Pulling the spreading operation piece of the corner waterproofing member, stretching the spreading waterproof material and covering and pasting the seam.
When the spreading operation piece is pulled, the spreading portion of the spreading waterproof material between the spreading operation piece and the corner contact piece is greatly stretched. If there is no spreading operation piece, it is difficult to grasp the end of the soft spreading waterproof material and stretch it evenly, but if you hold the spreading operation piece with some rigidity, it will be equal to the entire width of the spreading part It is easy to stretch with force. In addition, if the corner contact piece is securely attached and fixed, the corner contact piece will not be peeled off even if the extension operation piece is pulled strongly to greatly extend the extension part. The spreading operation piece can be pulled while holding the corner contact piece.

With the spreading part stretched to a predetermined length and the spreading operation piece reaching the predetermined position, cover the spreading waterproof material on the back of the spreading operation piece over the seam extending from the corner. Affix to the construction surface. If necessary, the spreading operation piece can be bent and deformed.
Thus, waterproofing can be performed by covering the area from the corner to the predetermined range of the seam with the spread waterproof material. Since both ends are securely fixed by the spreading operation piece and the corner contact piece, the extension of the spreading waterproof material does not return or rise over time.
In addition, in the location of the spreading operation piece and the corner contact piece, the spreading waterproof material can be strongly adhered to the construction surface by strongly pressing from the surface. If the shape of both ends is determined by the spread operation piece and the corner contact piece, the spread waterproof material easily adheres to the construction surface even in the intermediate spread portion. However, if necessary, if the work of pushing the spread waterproof material into the seam or pressing it against the construction surface is performed even in the spread part, stronger attachment, that is, waterproof construction becomes possible. Even if the work to partially hold the spread part is performed, the spread waterproof material is fixed by the spread operation pieces and the corner contact pieces at both ends, so the other parts are greatly displaced or deformed excessively It is difficult to cause problems such as

<Other processes>
There may be a case where all the joints cannot be waterproofed with only the corner waterproofing member. In that case, waterproof construction may be performed by combining a normal waterproof tape or a waterproof sheet. For example, a corner waterproofing member is used for a corner that is difficult to construct with a conventional waterproof tape and a joint near the corner, and a simple flat surface or one-direction bent surface is waterproofed with a normal waterproof tape. Efficient and workable waterproof construction is possible.
After the waterproof construction in the predetermined range is completed, the finishing process and the cover work similar to the normal building construction can be freely performed. For example, finish mortar coating, paint finishing, and attaching a cover sheet.

The corner waterproof member according to the present invention is a simple and reliable way to connect a corner called a projecting corner, an entrance corner, etc., and a joint extending from the corner, out of places where waterproof construction is required in a building such as a house. Waterproof construction is possible.
Specifically, when the corner abutting piece is disposed at the corner and the corner is covered with the spread waterproof material on the back surface of the corner abutting piece, the waterproof construction of the corner is completed. Depending on the shape of the corner contact piece, the corner contact piece can be naturally placed in an appropriate position at an appropriate position of the corner, so that even a skilled engineer can shorten the good finish. Can be achieved in time. Differences in finish by workers are unlikely to occur, and stable quality performance can be maintained.

After the corner abutting piece is constructed in a predetermined position and posture, it extends from the corner by pulling the spreading operation piece to stretch the spreading waterproof material and sticking the spreading operation piece to the construction surface A wide range of seams can be securely covered with a spread waterproof material for waterproofing. Since it is not necessary to directly grip the spread waterproof material that is soft and difficult to handle, there is hardly any difference in the finish depending on the skill level, and a stable finish is always obtained.
In addition, if the spread waterproof material is fixed to the construction surface in the correct position and posture at both ends of the corner contact piece and the spread operation piece, the details of the spread waterproof material can be reliably obtained at the intermediate position. In addition, it is easy to push the seam into the seam, and it is possible to perform waterproof construction with higher reliability and higher quality accuracy.

The embodiment shown in FIG. 1 represents a corner waterproofing member used for waterproof construction such as a corner portion on a peripheral wall surrounding the outer periphery on the roof of a house, and waterproof construction using the corner waterproof member.
[Waterproof material for corners]
As shown in FIG. 1, the corner waterproof member 10 includes a spread waterproof material 20, a corner contact piece 30, and a spread operation piece 40.
<Expanded waterproof material>
The spread waterproof material 20 constituting the entire outer shape of the corner waterproof member 10 is made of an EPDM rubber sheet, and is a waterproof sheet excellent in spreadability with a thickness of 1.3 mm and an elongation rate of 150%. More specifically, a commercially available waterproof and airtight tape for housing [trade name “Hyperflash” No. 695, manufactured by Nitto Denko Corporation).

The outer shape of the corner waterproofing member 10, that is, the spread waterproofing material 20, is generally a band shape and one end is pointed in a triangular shape. For example, the width can be set to 60 mm and the total length can be set to about 110 mm.
An adhesive layer 24 is provided on the entire back surface of the spread waterproof material 20. The surface of the pressure-sensitive adhesive layer 24 is covered with a release sheet 26. When the release sheet 26 is peeled off, the adhesive layer 24 is exposed, and the spread waterproof material 20 and the corner waterproof member 10 can be attached and attached.
<Corner contact piece>
The corner contact piece 30 is made of a shape-retaining sheet, and has a thickness of 0.2 mm and a bending return angle of 90 ° when bent by 90 °. The shape-retaining sheet exhibits excellent shape-retaining properties by being stretched at a high magnification. In Fig.1 (a), it arrange | positions so that the length direction of the waterproof member 10 for corners may become in parallel with the extending | stretching direction of a shape-retaining sheet | seat. As a specific example of the shape-retaining sheet, a commercially available uniaxially stretched polyolefin sheet or polycarbonate sheet can be used.

The corner contact piece 30 has a square-shaped fixing portion 32. Each side of the fixing portion 32 is disposed so as to be inclined at an angle of 45 ° with respect to the length direction of the corner waterproofing member 10. The diagonal line of the fixing portion 32 is the width of the corner waterproofing member 10. If the width of the corner waterproofing member 10 is 60 mm, the side length of the fixed portion 32 is about 42 mm. A pair of side sides of the corner contact piece 30 protrudes in a triangular shape from the end of the corner waterproofing member 10.
The corner abutting piece 30 has projecting portions 34 and 34 projecting outward in the form of strips on the two sides opposite to the side projecting from the end of the fixed portion 32. The width of the overhang portion 34 is set to 10 mm, for example. The overhang portion 34 has a shape that is obliquely cut off on both sides of the corner waterproofing member 10.

The entire surface of the corner contact piece 30 is integrally joined to the spread waterproof material 20. Specifically, it is bonded through a double-sided adhesive film (not shown). Therefore, the portion of the spread waterproof material 20 that is bonded to and integrated with the corner contact piece 30 can be deformed in the thickness direction, but substantially not deformed in the surface direction.
<Easily bent line>
An easy-bending line 36 is provided along the boundary between the fixed portion 32 and the overhang portion 34 in the corner contact piece 30.
The easy-bending line 36 is easier to bend than the surrounding portion by pressing the corner contact piece 30 made of a shape-retaining sheet and providing a small dent line on the surface. In FIG. 1A, it is drawn with a broken line for easy understanding, but it is actually a continuous dent line.

<Expansion operation piece>
The spreading operation piece 40 is made of the same shape-retaining sheet as the corner contact piece 30.
It arrange | positions in the edge part opposite to the edge part in which the corner contact piece 30 is arrange | positioned among the waterproof members 10 for corners.
The spreading operation piece 40 has a narrow rectangular band shape, and is disposed over the entire width along the edge of the corner waterproofing member 10. For example, the width of the spreading operation piece 40 can be set to 10 mm. Also in the case of the spreading operation piece 40, the extending direction of the shape-retaining sheet is arranged so as to be parallel to the length direction of the corner waterproofing member 10.

Similarly to the corner contact piece 30, the spread operation piece 40 is integrally joined to the spread waterproof material 20 via a double-sided adhesive film. Even in the portion of the spread waterproof material 20 that is joined and integrated with the spread operation piece 40, it becomes difficult to deform in the surface direction.
<Expansion part>
The spread waterproof material 20 whose surface is covered with the corner contact piece 30 and the spread operation piece 40 as described above is spread waterproof in the space between the corner contact piece 30 and the spread operation piece 40. The extended portion 22 has the surface of the material 20 exposed.
In this extended part 22, the spreadability which the extended waterproof material 20 originally has can fully be exhibited.

<Example of change>
In the form of the corner waterproofing member 10 shown in FIG. 1, the shape of the fixing portion 32 can be changed from a square to another shape.
For example, it is possible to employ a fixing portion 32 in which rectangular bands are combined in an L shape along easy-bending lines 36 and 36 having an L shape. This is because, if the fixing portion 32 is useful for sticking the spread waterproof material 20 around the corner portion and the seam extending in the horizontal direction, the portion away from the corner portion is not so important for the waterproof function. In the case of the L-shaped fixing portion 32, it is desirable to have a width that facilitates operations such as positioning and pressing.

A fixed portion 32 having a shape obtained by cutting off the entire portion protruding in a triangular shape at the end portion of the corner waterproofing member 10 or a part on the end portion side can also be employed. The total length of the corner waterproofing member 10 can be shortened.
[Waterproofing construction]
FIG. 2 shows a construction state of the corner waterproofing member 10.
In the roof portion of the house, a floor material 64 in the horizontal direction and peripheral wall materials 62 and 63 constituting the peripheral wall of the roof are constructed. Each face material 64 is composed of a wood material, a ceramic building material board, or the like. Corners where the face materials 62, 63, 64 are adjacent to each other at right angles are the corners. At this corner, a seam extends in three directions from the center point of the bottom. Specifically, the joint between the face member 62 and the face member 64 and the joint between the face member 63 and the face member 64 extend in the horizontal direction perpendicular to each other, and the joint between the face member 62 and the face member 63 extends in the vertical direction.

The corner waterproofing member 10 is used for waterproofing from such a corner to the middle of the seam extending in the vertical direction of the face members 62 and 63.
The corner waterproof member 10 peels off the release sheet 26 on the back side of the spread waterproof material 20 to expose the adhesive layer 24. As the construction work proceeds, the spread waterproof material 20 can be attached while peeling off the release sheet 26 little by little from the end on the corner contact piece 30 side.
The corner contact piece 30 of the corner waterproofing member 10 is brought close to the corner. The fixing portion 32 is disposed on the surface of the face material 64. The easy-bending line 36 that is the side edge of the fixing portion 32 is made to coincide with the outer side of the face member 64, that is, the joint with the face member 62 and the joint with the face member 63. The overhanging portion 34 is bent upward from the position of the easy bending line 36. The bent overhang portions 34 and 34 are disposed on the surfaces of the face material 62 and the face material 63, respectively.

In this state, if the fixing portion 32 and the overhang portion 34 are strongly pressed from the surface side to the face materials 62 to 64, the spread waterproof material 20 is strongly bonded via the adhesive layer 24. Since the fixing portion 32 and the overhanging portion 34 are flat and shape-retaining, it is easy to evenly apply the entire surface of the spread waterproof material 20. It is possible to prevent the spread waterproof material 20 from being unevenly deformed or wrinkled, or having a large dent or a hole in a finger or the like. In particular, even in the vicinity of the center of the corner where the joints in the three directions gather, according to the rectangular parallelepiped shape formed by the fixed portion 32 and the overhang portions 34 and 34, it can be surely brought into close contact.
In the state in which the corner contact piece 30 is installed, the center line in the length direction of the corner waterproof member 10 having a strip shape is accurately positioned at a position corresponding to the vertical seam between the face member 62 and the face member 63. Placed in.

When the spreading operation piece 40 is pulled upward, the spreading waterproof material 20 is stretched. After extending to a predetermined length, the spreading operation piece 40 is bent at a right angle at the center. Since the crease is formed along the extending direction of the shape-retaining sheet serving as the spreading operation piece 40, it is bent relatively easily. The spreading operation piece 40 bent into a square shape is strongly pressed against the surfaces of the face materials 62 and 63, and the spreading waterproof material 20 is attached and fixed.
The spread portion 22 of the spread waterproof material 20 stretched between the spread operation piece 40 and the overhang portions 34 of the corner contact piece 30 is centered in the same manner as the spread operation piece 40. It is bent and attached to the face materials 62 and 63. It can also be pressed from the surface of the spread part 22 so that the spread part 22 is strongly joined to the face materials 62 and 63. Since both ends of the spread waterproof material 20 are securely fixed between the spread operation piece 40 and the overhang portions 34 and 34 of the corner contact piece 30, the spread operation piece 40 is slightly biased to the middle spread portion 22. Even if a force is applied, the extended portion 22 is not bent so as to be disengaged from the joint, and excessive wrinkles or uneven deformation does not occur. By using a spatula or the like to strongly push the center line of the extended portion 22 into the seam, it is possible to eliminate the gap or lift of the extended waterproof material 20 that is easily formed at the seam.

The corner waterproofing member 10 thus constructed is an entrance corner composed of the face materials 62, 63, 64, and includes a seam in three directions from the center of the corner to the vicinity of the center, and a seam in the vertical direction. The middle part can be covered accurately and powerfully with the spread waterproofing material 20 to exhibit a good waterproof function.
The linear seam remaining outside the corner waterproofing member 10 can be easily waterproofed by applying a normal waterproof tape.
After the waterproof construction is completed, the surface finishing material can be applied, the mortar finish, the surface finish coating, etc. can be applied in the same manner as the normal construction work.

[Waterproof construction to the top surface]
The construction mode shown in FIG. 3 is basically the same as the construction mode shown in FIG. The differences are mainly explained.
The installation of the corner contact piece 30 and the operation of pulling up the spread operation piece 40 and extending the spread portion 22 of the spread waterproof material 20 are the same as in the above embodiment.
In the above-described embodiment, the spreading operation piece 40 is lifted only halfway in the vertical seam, but in this embodiment, the spreading operation piece 40 is pulled up to a position exceeding the upper ends of the face materials 62 and 63. The spread part 22 of the spread waterproof material 20 is greatly stretched.

Thereafter, the spread operation piece 40 is pressed against the surface of the corner portion where the upper end surfaces of the face materials 62 and 63 intersect, and the spread waterproof material 20 is attached.
The spread portion 22 of the spread waterproof material 20 having very excellent spreadability covers the both sides of the vertical seam by the face materials 62 and 63, and the middle of the upper surface from the upper edge of the face materials 62 and 63. A complicated three-dimensional deformation is made so as to cover the entire area. Similar to the above-described embodiment, if the surface of the extended portion 22 is strongly pressed against the face materials 62 and 63 or is pushed with a spatula along the joint, a gap or a lift is left between the face materials 62 and 63. The waterproof function by the spread waterproof material 20 can be exhibited satisfactorily without causing close contact.

In order to realize such a construction form, the length of the spread part 22 or the spread ability is sufficiently provided. If it does so, the additional waterproof construction by another waterproof tape like the construction form of the said FIG. 2 will become unnecessary, and the improvement of work efficiency can be achieved. For example, if the height of the face materials 62 and 63 is about 50 mm, it is possible to sufficiently cope with the construction conditions. When there is a height higher than that, it is more practical to adopt the construction form shown in FIG.
[Waterproofing from the top corner]
In the embodiment shown in FIG. 4, the same corner waterproofing member 10 is applied to the corner at the upper end of the outer periphery.

The face materials 62 and 63 are abutted against each other with the end face cut off at 45 °. At the upper end of the corner portion thus configured, there is a corner portion where the upper surfaces of the face members 62, 62, the outer surface of the face member 62, and the outer surface of the face member 63 are gathered at right angles to each other. Is done.
The corner contact piece 30 of the corner waterproofing member 10 is disposed and fixed at the corner. Two sides of the fixed portion 32, that is, easy-bending lines 36 and 36, are arranged on the outer peripheral edges of the face materials 62 and 63. The overhang portions 34, 34 are bent downward and attached to the outer surfaces of the face members 62, 63. 2 and 3, the bending direction of the overhang portion 34 is reversed, but if there is an easy-bending line 36, it can be bent relatively easily.

After the spreading operation piece 40 is pulled downward, it is bent into a square shape at the center as described above. The folded spreading operation piece 40 is pressed against the surfaces of the face materials 62 and 63 and pasted. The middle part of the joint extending vertically downward from the corner is reliably covered with the spread waterproof material 20.
[Application form of waterproof material for corners]
In the embodiment shown in FIG. 5, the corner waterproofing member 10 is used at the corner at the upper end of the inner periphery.
In this case, the corner contact piece 30 is disposed in the middle of the vertical seam. The corner contact piece 30 is folded in half along the diagonal line of the fixed portion 32, and the left and right triangular portions are disposed on the surfaces of the face material 62 and the face material 63, respectively. Since it folds along a fold line parallel to the extending direction of the shape-retaining sheet serving as the corner contact piece 30, it can be folded in a relatively easy and accurate manner. The overhanging portion 34 is disposed on the same surface as the fixed portion 32.

From this state, the spreading operation piece 40 is pulled up and attached to the upper end surfaces of the face materials 62 and 63 in the same operation as in the embodiment of FIG.
In this way, with the corner waterproofing member 10, waterproofing can be performed up to the middle of the joint extending vertically downward from the corner at the upper end of the inner periphery.
However, in the case of this construction form, it is a simple form waterproof member in which the spreading operation pieces 40 are arranged at both ends without using the corner waterproof member 10 having the shape shown in FIG. There is also a good case.
[Example of changing the shape of the waterproof member for the corner (1)]
The corner waterproofing member 10 shown in FIG. 6 is slightly different from the embodiment shown in FIG. Basically, there are many common parts, so the differences will be mainly described.

The point which has the spreading | dampening waterproofing material 20, the corner contact piece 30, and the spreading operation piece 40 is the same. It has the same layer configuration as FIG. 1 (b), and also includes an adhesive layer 24 and a release sheet 26.
However, the overall shape of the corner waterproofing member 10 and the spread waterproofing material 20 is a rectangular strip with the same cut-off shape at both ends.
In the corner contact piece 30, the end portion side of the corner waterproof member 10 has a rectangular shape parallel to the length direction of the corner waterproof member 10. On the central side of the corner waterproofing member 10, there are easy-bending lines 36 and 36 and V-shaped projecting portions 34 and 34 that form V-shapes that expand from side to side in the width direction.

The corner waterproofing member 10 having such a configuration can realize the construction shown in FIG.
The vertical face material 62 and the face material 63 are orthogonal to each other, and a horizontal face material 64 is disposed on the lower surface thereof. The so-called protruding corner is called between the protruding corner of the face materials 62 and 63 and the face material 64. Corners are configured.
The corner contact piece 30 of the corner waterproofing member 10 is disposed on the face material 64 outside the corner. The left and right easily bent lines 36 and 36 are arranged along the face materials 62 and 63. The overhang portions 34, 34 are bent upward and are attached to the surfaces of the face materials 62, 63. The spreading operation piece 40 is pulled upward, and the spreading part 22 is stretched in the vertical direction. The spreading operation piece 40 is bent into a dogleg shape at the center and pressed against the surfaces of the left and right face members 62 and 63 and pasted. The spread waterproof material 20 of the spread part 22 covers the surfaces of the face materials 62 and 63 on both sides across the joint.

As a result, the corner waterproofing member 10 can be waterproofed well from the protruding corner formed by the face members 62, 63, 64 to the middle of the joint extending vertically upward.
[Example of changing the shape of waterproof material for corners (2)]
The embodiment shown in FIGS. 8 and 9 has the same basic form as the embodiment shown in FIG. The overlapping description will be omitted, and the differences will be mainly described.
As shown in FIG. 8A, the corner contact piece 30 is composed only of the rhombus-shaped fixing portion 32, and the overhanging portion 34 and the easily bent line 36 as in the above-described embodiment do not exist. A commercially available polycarbonate resin sheet having a thickness of 0.4 mm is used as the material of the corner contact piece 30.

The spread waterproof material 20 has both sides of the spread part 22 projecting in a “h” shape and forming a stretch side 23. The overhang amount of the overhang side 23 is, for example, about 5 mm. An adhesion reinforcing layer 25 is laminated between the pressure-sensitive adhesive layer 24 and the release sheet 26 on the back surface side of the spread waterproof material 20. The adhesion reinforcing layer 25 is provided only in a range corresponding to the corner contact piece 30 and is made of a commercially available double-sided adhesive acrylic film (thickness 0.27 mm). The adhesion reinforcing layer 25 does not elastically deform greatly in the surface direction unlike the pressure-sensitive adhesive layer 24.
In the usage form of the corner waterproofing member 10 shown in FIG. 9, when the corner abutting piece 30 is disposed at the corner constituted by the floor surface material 64 and the peripheral wall materials 62, 63, the fixing portion 32 is the floor. Arranged on the face material 64, the side end faces in two directions adjacent to the fixing portion 32 abut against the peripheral wall surface materials 62 and 63, respectively. In this state, the corner contact piece 30 is positioned.

On the back side of the corner contact piece 30, the spread waterproof material 20 is joined to the floor material 64 by the adhesion reinforcing layer 25 in addition to the adhesive layer 24. Even when the adhesive layer 24 alone is insufficiently bonded, the presence of the adhesion reinforcing layer 25 allows the corner contact piece 30 and the spread waterproof material 20 to be strongly bonded to the floor material 64. If the corner contact piece 30 and the spread waterproof material 20 are strongly joined to the floor material 62, the floor material 62 can be obtained even if the spread operation piece 40 is pulled strongly to greatly extend the spread waterproof material 20. It is possible to satisfactorily prevent a part of the spread waterproof material 20 from being peeled off or lifted.
A corner formed on the side end surface of the fixed portion 32 of the corner contact piece 30 is pressed against the joint between the floor surface material 64 and the peripheral wall materials 62 and 63, and the spread waterproof material 20 is connected to the back of the joint. Can be reliably bonded.

  The spread part 22 of the spread waterproof material 20 is stretched in the vertical direction and simultaneously deforms so that the width on the left and right is reduced and narrowed. In the case of the said embodiment, as shown in FIG. 2, a width | variety becomes narrow in the center of the up-down direction of the extending part 22. As shown in FIG. However, in this embodiment, since there is a projecting side 23 projecting to the left and right, the width is substantially the same from the top to the bottom of the extended portion 22 as shown in FIG. The extended portion 22 does not become extremely narrow in part. The entire surface in the vertical direction can contact the peripheral wall members 62 and 63 with a sufficient area, and can exhibit a good waterproof function.

  The waterproofing member for corners of the present invention can easily and accurately waterproof the corners of rooftops and the like and conventionally connected seams in buildings such as houses, where waterproofing has been difficult. . The work efficiency of housing construction can be increased and productivity can be greatly improved.

The top view (a) and sectional drawing (b) of the waterproofing member for corners showing embodiment of this invention Perspective view showing construction status Perspective view showing another construction state Perspective view showing another construction state Perspective view showing another construction state The top view of the waterproofing member for corners which is another embodiment Perspective view showing construction status The top view (a) and sectional drawing (b) of the waterproofing member for corners which are another embodiment Perspective view showing construction status

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Waterproof member for corner part 20 Spreading waterproof material 22 Spreading part 24 Adhesive layer 26 Release sheet 30 Corner contact piece 32 Fixing part 34 Overhang part 36 Easy bending line 40 Spreading operation piece 62, 63, 64 surface Material

Claims (6)

It is a waterproofing member that is constructed along the joint between the surfaces from the corners composed of three-direction surfaces,
A waterproof sheet made of a waterproof sheet having excellent spreadability, having a strip shape, arranged along the seam from the corner, and having a pressure-sensitive adhesive layer on the back surface;
Consists of a shape-retaining sheet, on the opposite surface of the adhesive layer of the spread waterproof material, disposed at one end in the length direction, and a corner contact piece disposed at the corner,
A spreading operation piece made of a shape-retaining sheet, disposed on the opposite surface of the adhesive layer of the spread waterproof material at the end opposite to the corner contact piece, over the entire width of the spread waterproof material. A corner waterproofing member. The corner contact piece is
A fixed portion disposed on one surface at the corner and having side edges disposed along the remaining surface;
The corner waterproofing member according to claim 1, further comprising an overhanging portion that protrudes from a side edge of the fixing portion and is bent with respect to the fixing portion and disposed on the remaining surface of the corner portion. The fixing portion has side edges in two adjacent directions, and the side edges are arranged to be symmetrically inclined with respect to the center line in the length direction of the spread waterproof material,
The overhanging portion is arranged in a strip shape along each side edge of the fixed portion,
Furthermore, the waterproof member for corners of Claim 2 provided with the easy bending line which makes a bending easy between the said overhang | projection part and the said fixing | fixed part. The waterproof member for corners according to any one of claims 1 to 3, wherein the spread waterproof material is a waterproof sheet made of EPDM rubber, having a thickness of 0.65 to 1.3 mm and an elongation rate of 100 to 150%. The shape-retaining sheet is made of a resin sheet selected from the group consisting of polyolefin resin and polycarbonate resin, has a thickness of 0.2 to 0.4 mm, and a bending return angle when bent by 90 ° is 5 ° or less. The waterproofing member for corners according to any one of claims 1 to 4. Using the waterproofing member for corners according to claim 1 to 5, a method for waterproofing along the joint between the surfaces from the corners constituted by three-direction surfaces,
The corner abutting piece of the waterproof member for the corner is arranged at the corner, the corner abutting piece is deformed, and the spread waterproof material on the back side of the corner abutting piece is attached to all the three directions. Attaching (a);
A corner including a step (b) of pulling the spreading operation piece of the waterproofing member for the corner, stretching the spreading waterproof material between the spreading operation piece and the corner contact piece, and covering and covering the seam Waterproof construction method for the part.

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