JP6103331B1 - Water leakage prevention method for joints of remaining formwork panels - Google Patents

Abstract

[PROBLEMS] To provide a simple, high-efficiency, and reliable water leakage prevention tape using a water leakage prevention tape that can prevent rainwater that has penetrated into a consolidated material from leaking through a gap between joints of a remaining formwork panel for a long period of time. A method for preventing water leakage at the joints of the remaining formwork panel is provided. A method for preventing water leakage at a joint portion of a residual form panel according to the present invention is a water leakage preventing tape 1 comprising a nonwoven fabric tape 2 or an elastomer resin tape having instantaneous water absorption and expansion and having a predetermined thickness and width. Is used to prevent water leakage from the joint portion 12 of the remaining formwork panel. In this water leakage prevention construction method, at least one of the joint portion 12, the nonwoven fabric tape 2, or the joint portion 12, at least one of the elastomer resin tape, so that a margin of approximately 5 mm remains at both ends of the nonwoven fabric tape 2 or the elastomer resin tape, The double-sided adhesive waterproof resin layer 3 or the sealing agent 6 is provided, and the water leakage prevention tape 1 is brought into close contact with the remaining mold panel 11. [Selection] Figure 2

Description

  The present invention relates to a method for preventing water leakage at a joint portion of a remaining formwork panel.

Conventionally, there has been a problem that the surface of the remaining formwork is soiled due to the white flower phenomenon or the like due to water leakage from the gaps in the joints of the remaining formwork panel constituting the remaining formwork.
In order to prevent water leakage of the remaining mold, generally an adhesive sealing material or a waterproof tape is used (for example, Patent Document 1).
Adhesive waterproof materials such as butyl rubber and silicone are used for the adhesive seal material, and these are applied to the gaps in the joints of the remaining formwork panels to ensure waterproofness, and water leaks from the gaps in the joints. The construction method which prevents is generally adopted. On the other hand, butyl rubber-based, acrylic-based, and silicone-based adhesive waterproof tapes are used for waterproof tapes, and these are applied to the gaps in the joints to ensure waterproofness and prevent water leakage. .

JP 2009-243237 A

As a general construction method using a waterproof seal, as shown in FIG. 1A, first, the gap 101 of the joint portion 104 on the back surface of the remaining mold panel 100 (hereinafter also referred to as the residual mold 100) is closed. In this way, the waterproof tape 102 is applied in complete contact. Thereafter, as shown in FIG. 1 (b), the back surface of the remaining mold 100 is filled with concrete 103. However, even though the waterproof tape 102 was installed in close contact with the joint portion 104, as shown in FIG. 1C, a gap 105 due to skin separation between the remaining mold panel 100 and the waterproof tape 102 was obtained. (Hereinafter referred to as a skin separation gap) may be formed. This occurs because the concrete 103 itself is slightly reduced when the concrete 103 is solidified. If it does so, the rain water which penetrate | invaded the concrete frame (concrete 103) will flow out to the surface of the residual formwork panel 100 from the clearance gap 101 of the joint part 104. FIG.
Therefore, with the passage of time, dirty water such as free lime water contained in the filled concrete 103 and air mortar flows out from the gap 101 of the joint portion 104, and the surface (decorative surface) of the remaining mold 100 is white. Fouled by flowering phenomenon.

  Accordingly, the present invention provides a method for preventing the rainwater that has entered the solidified solidified material (concrete frame, etc.) from leaking from the gaps in the joints of the remaining formwork panel over a long period of time. An object of the present invention is to provide a method for preventing water leakage at a joint portion of a residual form panel that uses a leakage prevention tape and dramatically improves the reliability of water leakage prevention in a simple and efficient manner.

The method for preventing water leakage at the joint portion of the residual mold panel according to the present invention is provided in order to prevent water leakage by closing the gap at the joint portion of the residual mold panel, has instantaneous water absorption and expandability, and has a thickness of approximately. Leakage of the joints of the remaining formwork panel using the water leakage prevention tape of the joints of the remaining formwork panel comprising a strip-shaped nonwoven fabric tape or an elastomer resin tape having a width of 0.5 mm to 10 mm and a width of about 10 mm to 50 mm. This is a water leakage prevention method for the joint part of the remaining formwork panel, and at least one of the joint part, the nonwoven tape, or the joint part so that a margin of approximately 5 mm remains on both ends of the nonwoven tape or the elastomer resin tape. Attach a double-sided adhesive waterproof resin layer with a release sheet attached to at least one of the elastomer resin tapes, peel off the release sheet to expose the adhesive surface, and prevent adhesion to the joints By pressing the water leakage prevention tape on the joint part of the residual mold panel against the residual mold panel so that the center of the resin layer width coincides with the residual mold panel, the gap of the joint part is almost closed, and the residual mold panel panel The nonwoven fabric tape or elastomer resin tape expands due to the surplus water or rainwater infiltrated on the back, and the remaining skin separation gap is automatically closed. Further, the present invention is characterized in that water leakage is prevented from a gap in the joint portion of the remaining formwork panel over a long period of time, and the reliability of water leakage prevention is drastically improved.
In addition, instantaneous water absorption expansibility means expanding about 80% or more in 30 seconds after absorbing water.

In addition, the water leakage prevention method for the joint portion of the residual mold panel of the present invention is provided to prevent water leakage by closing the gap of the joint portion of the residual mold panel, has an instantaneous water absorption expansion property, and has a thickness. Using a non-woven tape or an elastomer resin tape having a width of about 0.5 mm to 10 mm and a width of about 10 mm to 50 mm to prevent water leakage from the joint part of the residual mold panel. It is a water leakage prevention method, and a sealing material for adhesive waterproofing is applied in advance to at least one of the joint part and the nonwoven fabric tape, or at least one of the joint part and the elastomer resin tape, and the adhesive force of this sealing material has not disappeared. The nonwoven fabric tape or elastomer resin tape is applied to the remaining mold panel so that the joint portion and the width of the nonwoven fabric tape or the joint portion and the center of the elastomer resin tape width coincide with each other. By sticking and adhering, the gaps in the joints are accurately closed, and the nonwoven fabric tape or elastomer resin tape expands and closes due to the surplus water or rainwater infiltrated in the back of the remaining formwork panel. By automatically closing the remaining skin separation gap, water leakage is prevented from the gap between the joints of the remaining formwork panel for a long period of time with high efficiency. It is characterized by improving.
In addition, instantaneous water absorption expansibility means expanding about 80% or more in 30 seconds after absorbing water.

  The water leakage prevention tape of the joint part of the residual mold panel used in the method of preventing water leakage of the joint part of the residual mold panel according to the present invention is a non-woven tape having instantaneous water absorption and expansion absorbs moisture such as rainwater, By instantly expanding, the gap between the joints is automatically closed by the double-sided adhesive waterproof resin layer, and the skin separation gap formed between the remaining mold and the consolidated material is automatically closed by the non-woven tape. Can be removed. Then, rainwater can be prevented from entering and leaving the joints through the skin separation gap on the back of the remaining formwork, and sewage such as free lime water contained in rainwater and concrete can be removed from the joints to the front side. It can prevent outflow. Therefore, the water leakage prevention method for the joint portion of the remaining mold panel prevents the white mold phenomenon from occurring on the surface (decorative surface) of the remaining mold panel and prevents the remaining mold from being soiled. In addition, since the gap between the joints is blocked by the water leakage prevention tape at the joints of the remaining mold panel, it is possible to prevent rainwater from entering from the front side of the remaining mold and suppress deterioration of the concrete. .

The method for preventing water leakage at the joint part of the residual form panel according to the present invention is such that at least one of the joint part, the nonwoven tape, or the joint part, the elastomer so that a margin of about 5 mm remains at both ends of the nonwoven fabric tape or the elastomer resin tape. Since the double-sided adhesive waterproof resin layer provided with the release sheet is affixed to at least one of the resin tapes, the gap between the joints can be closed with high accuracy.
In particular, when a double-sided adhesive waterproof resin layer is applied to both the joint portion and the nonwoven fabric tape, the gap between the joint portions can be reliably closed and the nonwoven fabric tape and the remaining mold can be brought into close contact with each other. Similarly, when a double-sided adhesive waterproof resin layer is applied to both the joint and the elastomer resin tape, the gap between the joints can be reliably closed and the elastomer resin tape and the remaining mold can be brought into close contact with each other.
The method for preventing water leakage at the joint portion of the residual mold panel of the present invention can prevent water leakage from the gap of the joint portion of the residual mold panel for a long period of time and dramatically improve the reliability of water leakage prevention. it can.

Further, the water leakage prevention method for the joint part of the residual form panel according to the present invention is to apply a sealing material in advance to at least one of the joint part and the nonwoven fabric tape, or at least one of the joint part and the elastomer resin tape. The elastomer resin tape can be affixed to the remaining mold, and the gap at the joint can be closed with high accuracy.
In particular, when a sealing material is applied to both the joint portion and the nonwoven fabric tape, the gap between the joint portions can be reliably closed, and the nonwoven fabric tape and the remaining mold can be brought into close contact with each other. Similarly, when the sealing material is applied to both the joint portion and the elastomer resin tape, the gap between the joint portions can be reliably closed and the elastomer resin tape and the remaining mold can be brought into close contact with each other.
The method for preventing water leakage at the joints of the remaining formwork panel can be carried out easily and efficiently, and prevents water leakage from the gaps at the joints of the remaining formwork panels over a long period of time. Can greatly improve the reliability.

It is a figure for demonstrating the water leak prevention construction method of the joint part of the conventional residual formwork panel. (A) Affixed initial state, (b) A state filled with a binder, (c) A state where a skin separation gap is formed It is a figure which shows the water leakage prevention tape of the joint part of the residual mold panel used for the water leak prevention construction method of the joint part of the residual mold panel which concerns on 1st embodiment of this invention. (A) sectional view, (b) perspective view It is a figure which shows the state in which the water leakage prevention tape of the joint part of the residual mold panel used for the water leak prevention construction method of the joint part of the residual mold panel which concerns on 1st embodiment of this invention was provided in the joint part. (A) initial state of application, (b) state in which the nonwoven fabric tape is expanded by absorbing excess water of the consolidated material, (c) state in which a skin separation gap is formed, (d) skin by expansion of the nonwoven fabric tape State where parting gap is closed It is a figure for demonstrating the process of affixing the water leak prevention tape of the joint part of a residual mold panel on the residual mold form in the water leak prevention construction method of the residual mold panel according to the first embodiment of the present invention. is there. It is a figure which shows the water leakage prevention tape of the joint part of the residual formwork panel used for the water leak prevention construction method of the joint part of the residual formwork panel which concerns on 2nd embodiment of this invention. (A) sectional view, (b) perspective view It is a figure which shows the state in which the water leak prevention tape of the joint part of the residual mold panel used for the water leak prevention construction method of the joint part of the residual mold panel which concerns on 2nd embodiment of this invention was provided in the joint part. (A) initial state of application, (b) state in which the nonwoven fabric tape is expanded by absorbing excess water of the consolidated material, (c) state in which a skin separation gap is formed, (d) skin by expansion of the nonwoven fabric tape State where parting gap is closed It is a figure which shows the state in which the water leakage prevention tape of the joint part of the residual mold panel used for the water leak prevention construction method of the joint part of the residual mold panel which concerns on 3rd embodiment of this invention was provided in the joint part. (A) initial state of application, (b) state in which the nonwoven fabric tape is expanded by absorbing excess water of the consolidated material, (c) state in which a skin separation gap is formed, (d) skin by expansion of the nonwoven fabric tape State where parting gap is closed

[First embodiment]
The water leakage prevention construction method for the joint portion of the remaining mold panel according to the present embodiment, and the water leakage prevention tape for the joint portion of the residual mold panel used in the water leakage prevention construction method for the joint portion of the residual mold panel are shown in FIG. A description will be given with reference to FIGS.
The water leakage prevention tape at the joint portion of the remaining mold panel is provided to automatically close the gap between the joint portion and the skin separation gap of the remaining mold panel and prevent water leakage from the gap at the joint portion. As shown in FIG. 2 (a), a water leakage prevention tape 1 (hereinafter referred to as a water leakage prevention tape 1) at the joint portion of the remaining mold panel is composed of a nonwoven fabric tape 2 having instantaneous water absorption and expansion properties, And a double-sided adhesive waterproof resin layer 3 attached to one side of the nonwoven fabric tape 2.
In addition, instantaneous water absorption expansibility means expanding about 80% or more in 30 seconds after absorbing water.

[Nonwoven fabric tape 2]
The nonwoven fabric tape 2 expand | swells by absorbing a water | moisture content, and enlarges the thickness (volume) of the water leak prevention tape 1 whole.
The nonwoven fabric tape 2 has a strip shape and is designed to have an arbitrary size. As the nonwoven fabric tape 2, for example, a tape having a thickness of about 3 mm to 10 mm and a width of about 10 mm to 50 mm, which is three times or more the thickness, can be used. The width of the nonwoven fabric tape 2 is preferably at least 3 times the thickness.
For example, a water-expandable nonwoven fabric (KYOWA RUBER, Kyowa Rubber Co., Ltd.) can be used for the nonwoven fabric tape 2.

[Double-sided adhesive waterproof resin layer 3]
The double-sided adhesive waterproof resin layer 3 has adhesiveness on both sides, one surface is adhered to the nonwoven fabric tape 2, and the other surface is provided with a release sheet 4 that can be peeled freely.
The double-sided adhesive waterproof resin layer 3 is designed to be smaller than the size of the nonwoven fabric tape 2 and is attached so as to leave a margin of about 5 mm to 15 mm at both ends of the nonwoven fabric tape 2. In FIG. 2B, the double-sided adhesive waterproof resin layer 3 is provided on the nonwoven fabric tape 2 leaving a margin of 7.5 mm at both ends.
For this double-sided adhesive waterproof resin layer 3, for example, a butyl rubber-based, acrylic-based, or silicone-based adhesive resin can be used.

Next, the water leakage prevention construction method (hereinafter referred to as the water leakage prevention construction method) of the joint portion of the remaining mold panel using the water leakage prevention tape 1 will be described. This water leakage prevention method is intended for the remaining mold 10 that is produced by filling the back surface with concrete 20 as a solidifying material.
In the water leakage prevention method, the release sheet 4 of the double-sided adhesive waterproof resin layer 3 attached to the water leak prevention tape 1 is peeled off to expose the adhesive surface, and the joint 12 and the center of the double-sided adhesive waterproof resin layer 3 width Are pressed so as to match, the double-sided adhesive waterproof resin layer 3 closes and closes the gap 13 of the joint 12.
The consolidated material is not limited to the concrete 20 and can be used as long as it contains water and solidifies with time. For example, mortar, foam mortar, or the like can be used.

First, the remaining formwork panel 11 is stacked at a predetermined position to construct the remaining formwork 10 (residual formwork construction process).
As the remaining formwork panel 11, for example, a concrete rectangular shape can be used. As this remaining formwork panel 11, for example, a panel having a certain size that can be easily carried by hand, such as 30 cm long × 90 cm wide × 3 cm thick can be used.

Next, the water leakage prevention tape 1 is attached to the joint portion 12 of the remaining mold panel 11 (tape application step). Specifically, the release sheet 4 attached to the double-sided adhesive waterproof resin layer 3 is peeled off to expose the adhesive surface. Then, as shown in FIG. 3 (a), the remaining mold panel is formed so that the joint portion 12 and the center of the width of the double-sided adhesive waterproof resin layer 3 substantially coincide with the adhesive surface of the double-sided adhesive waterproof resin layer 3. 11, the double-sided adhesive waterproof resin layer 3 is brought into close contact with the remaining mold panel 11. If it does so, the clearance gap 13 of the joint part 12 of the residual mold panel 11 will be block | closed by the double-sided adhesive waterproof resin layer 3.
At this time, since the double-sided adhesive waterproof resin layer 3 is designed to be smaller than the size of the nonwoven fabric tape 2 and attached, a gap is formed between the nonwoven fabric tape 2 and the remaining formwork panel 11.
As shown in FIGS. 4A and 4B, the water leakage prevention tape 1 is attached to the entire area of the joint portion 12 of the remaining mold panel 11.
In addition, in this embodiment, although the example which affixes the water leak prevention tape 1 on the whole area | region of the joint part 12 is shown, the location where the water leak prevention tape 1 is affixed may be determined appropriately by the installer. For example, it can also be affixed only at a location where the gap 13 of the joint portion 12 is large.

  After affixing the water leakage prevention tape 1, the back surface of the remaining mold 10 is filled with concrete 20 (solidification material filling process). When the concrete 20 is filled, the nonwoven fabric tape 2 absorbs excess water of the concrete 20 as shown in FIG. Then, as indicated by the arrows, the nonwoven fabric tape 2 expands in all directions, and the nonwoven fabric tape 2 closes the gap between the nonwoven fabric tape 2 and the remaining formwork panel 11.

Thereafter, the concrete 20 is solidified. As the concrete 20 solidifies, the nonwoven fabric tape 2 is fixed to the concrete 20. Then, as the concrete 20 shrinks in the process of solidifying, the nonwoven fabric tape 2 is drawn toward the concrete 20 as shown in FIG. If it does so, a skin separation will arise between the nonwoven fabric tape 2 and the residual formwork panel 11, and the skin separation gap 21 will be formed.
The actual size of the skin separation gap 21 is about 0.1 mm to 0.5 mm. However, for convenience of explanation, the size is shown larger than the actual size in the drawings. The same applies to the following drawings.

  When rainwater enters from the skin separation gap 21 or the bubbles or capillaries of the filled concrete 20, the nonwoven fabric tape 2 further absorbs moisture and expands in the entire circumferential direction as shown by the arrows in FIG. Power is generated. In the water leakage prevention tape 1, the periphery other than the remaining mold panel 11 side is hardened with concrete 20. Therefore, the nonwoven fabric tape 2 expands to the remaining mold panel 11 side, and accordingly, the double-sided adhesive waterproof resin layer 3 also moves to the remaining mold panel 11 side. Then, the gap 13 in the joint portion 12 is automatically closed by the double-sided adhesive waterproof resin layer 3, and the skin separation gap 21 is automatically closed by the nonwoven fabric tape 2.

Next, the effects of the water leakage prevention method and the water leakage prevention tape 1 according to this embodiment will be described.
The water leakage prevention tape 1 is such that the nonwoven fabric tape 2 absorbs moisture such as rainwater and expands, so that the gap 13 of the joint portion 12 is automatically closed by the double-sided adhesive waterproof resin layer 3, and the nonwoven fabric tape 2 The separation gap 21 is automatically closed. Then, rainwater can be prevented from entering the gap 13 of the joint portion 12 from the skin separation gap 21 on the back surface of the remaining mold 10, and sewage such as free lime water contained in the rainwater or the concrete 20 is prevented. It is possible to prevent outflow from the gap 13 to the front side. Therefore, by providing the water leakage prevention tape 1 in the gap 13 of the joint portion 12 by the water leakage prevention construction method, the white mold phenomenon does not occur on the surface (decorative surface) of the remaining mold panel 11, and the remaining mold panel 11 The surface can be prevented from being soiled.
In addition, since the nonwoven fabric tape 2 is maintained in an expanded state and can retain moisture in the fibers constituting the nonwoven fabric tape 2, the gap 13 of the joint portion 12 is blocked by the water leakage prevention tape 1. The state can be maintained for a long time.

  Furthermore, since the gap 13 of the joint portion 12 is closed by the double-sided adhesive waterproof resin layer 3, rainwater can be prevented from entering from the front side of the remaining mold 10. By preventing the intrusion of rainwater from the front side of the remaining mold 10, deterioration of the concrete 20 can be suppressed.

  The water leakage prevention construction method according to the present embodiment is a simple construction method in which the water leakage prevention tape 1 only needs to be attached to the joint portion 12 of the remaining mold 10, and the joint portion of the remaining mold panel 11 is maintained over a long period of time. Since the water leakage from the 12 gaps 13 can be prevented, the reliability of the water leakage prevention can be drastically improved.

[Second Embodiment]
In the present embodiment, a water leakage prevention tape 1 in which a waterproof resin layer 5 is attached to a nonwoven fabric tape 2 and a water leakage prevention method using the water leakage prevention tape 1 will be described with reference to FIGS. 5 and 6. .
The water leakage prevention tape 1 used for the water leakage prevention construction method of the present embodiment is the same as the water leakage prevention tape 1 of the first embodiment except that the waterproof resin layer 5 is attached. Hereinafter, it demonstrates centering on the characteristic part of the water leak prevention tape 1 of this embodiment.

As shown in FIGS. 5A and 5B, the waterproof resin layer 5 is attached to the entire surface of the nonwoven fabric tape 2 on the side opposite to the surface on which the double-sided adhesive waterproof resin layer 3 is provided.
The waterproof resin layer 5 is waterproof and prevents moisture from entering the nonwoven fabric tape 2 from the outside. For the waterproof resin layer 5, for example, a butylene rubber-based or silicone-based adhesive resin material or the like can be used. Note that the material is not limited to the above as long as the material is highly waterproof.

Next, a water leakage prevention method using this water leakage prevention tape 1 will be described. Since the process of constructing the residual mold 10 and the process of applying the water leakage prevention tape 1 are the same as those in the first embodiment, the description thereof is omitted.
In the water leakage prevention method according to the present embodiment, as shown in FIG. 6A, the double-sided adhesive waterproof resin layer 3 is attached to the remaining mold 10, and then the back surface of the remaining mold 10 is filled with concrete 20. When the concrete 20 is filled, the nonwoven fabric tape 2 absorbs excess water from its side surfaces (upper part and lower part in the drawing), and as shown by the arrows in FIG. The gap that expands in the direction and is formed between the nonwoven fabric tape 2 and the remaining mold panel 11 is closed by the nonwoven fabric tape 2. The nonwoven fabric tape 2 does not absorb surplus water from the surface opposite to the surface to which the double-sided adhesive waterproof resin layer 3 is attached (the surface in contact with the concrete 20), and the upper portion and the lower portion absorb a large amount of moisture. . Therefore, the surface of the water leakage prevention tape 1 to which the waterproof resin layer 5 is attached is warped.
Thus, the point from which excess water is not absorbed from the surface (concrete 20 side) to which the waterproof resin layer 5 of the nonwoven fabric tape 2 is attached is different from the water leakage prevention tape 1 of the first embodiment.

When the concrete 20 is solidified, a skin separation gap 21 is formed as shown in FIG.
And if rainwater etc. penetrate | invade into the skin separation gap 21, the nonwoven fabric tape 2 will absorb a water | moisture content, and the force which expands to all directions as shown by the arrow of FIG.6 (d) will arise. Since the periphery of the non-woven tape 2 other than the remaining mold panel 11 side is hardened with concrete 20, the non-woven tape 2 expands to the remaining mold panel side 11, and accordingly, the remaining mold of the double-sided adhesive waterproof resin layer 3 Move to the panel 11 side. Then, the gap 13 of the joint portion 12 is automatically closed by the double-sided adhesive waterproof resin layer 3, and the skin separation gap 21 is automatically closed by the nonwoven fabric tape 2.

The water leakage prevention tape 1 used for the water leakage prevention construction method of the present embodiment is that the nonwoven fabric tape 2 absorbs moisture such as rainwater and expands to automatically fill the skin separation gap 21. It is possible to prevent rainwater from entering the gap 13 of the joint portion 12 from the skin separation gap 21 on the back surface, and the same effect as the water leakage prevention tape 1 of the first embodiment can be obtained.
Moreover, in the water leak prevention tape 1 used for the water leak prevention construction method of this embodiment, the waterproof resin layer 5 is provided in the whole surface on the opposite side to the surface where the double-sided adhesive waterproof tape 3 was attached. By providing this waterproof resin layer 5, when the concrete 20 is filled, it is possible to prevent excess water from being absorbed from the surface of the nonwoven fabric tape 2 on the concrete 20 side, so that the expansion of the nonwoven fabric tape 2 is completed during construction. It is possible to suppress the situation (the expansion state reaches the limit). Therefore, the expansion force of the nonwoven fabric tape 2 can be maintained as compared with the water leakage prevention tape 1 of the first embodiment.
Therefore, when rainwater or the like enters, the skin leakage gap 21 and the gap 13 of the joint portion 12 can be reliably closed by the water leakage prevention tape 1.

  In addition, although this embodiment demonstrated the example of the water leak prevention construction method using the water leak prevention tape 1 with which the double-sided adhesive waterproof resin layer 3 was attached to the nonwoven fabric tape 2, double-sided adhesive waterproof resin layer 3 is a joint part. 12, What is necessary is just to affix on at least one of the nonwoven fabric tapes 2. In particular, when the double-sided adhesive waterproof resin layer 3 is applied to both the joint portion 12 and the nonwoven fabric tape 2, the nonwoven fabric tape 2 can be brought into close contact with the remaining formwork panel 11, and the gap 13 of the joint portion 12 is reliably closed. be able to.

[Third embodiment]
In this actual embodiment, using the sealing material 6 and a strip-shaped nonwoven fabric tape 2 (water leakage prevention tape 1) having instantaneous water absorption and expansion, having a thickness of about 3 mm to 10 mm and a width of about 10 mm to 50 mm, A water leakage prevention method for preventing water leakage at the joints of the remaining mold panel will be described.
As the sealing material 6, it is possible to use a deformed silicone type, polyurethane type, acrylic urethane type, silicone type, butyl rubber type or the like.
First, as shown in FIG. 7 (a), the sealing material 6 is applied in advance to the gap 13 of the joint portion 12 of the remaining mold panel 11 in a range that leaves a margin of about 5 mm to 15 mm from both ends of the nonwoven fabric tape 2. Before the adhesive force of the sealing material 6 disappears, the nonwoven fabric tape 2 is pressed against the sealing material 6 so that the joint portion 12 and the center of the width of the nonwoven fabric tape 2 coincide with each other. The gap 13 of the portion 12 is closed with high accuracy.

When concrete 20 is filled on the back of the remaining mold 10, the nonwoven fabric tape 2 absorbs excess water and expands in all directions as indicated by the arrows in FIG. 11 is closed by the nonwoven fabric tape 2.
When the concrete 20 is solidified, a skin separation gap 21 is formed as shown in FIG. Thereafter, when the nonwoven fabric tape 2 absorbs rainwater or the like from the skin separation gap 21, a force that expands in all directions of the nonwoven fabric tape 2 is generated, as indicated by an arrow in FIG. Since the periphery of the non-woven tape 2 other than the remaining mold panel 11 side is hardened with concrete 20, the non-woven tape 2 expands to the remaining mold panel side 11 where the skin separation gap 21 is formed. Then, the gap 13 and the skin separation gap 21 of the joint portion 12 are automatically closed by the nonwoven fabric tape 2.

In the water leakage prevention method according to the present embodiment, since the sealing material 6 is applied in advance to the gap 13 of the joint portion 12, the gap 13 of the joint portion 12 can be closed with high accuracy.
In addition, in the water leakage prevention method, the intrusion of excess water or the like of the concrete 20 in which the nonwoven fabric tape 2 (water leakage prevention tape 1) pressed and adhered to the sealing material 6 is filled on the back surface of the remaining formwork panel 11 The nonwoven fabric tape 2 and the sealing material 6 automatically close the gaps 21 and the gaps 13 of the joint portions 12. Therefore, it is possible to prevent water leakage from the gap 13 of the joint portion 12 of the remaining mold panel 11 over a long period of time, and to greatly improve the reliability of preventing water leakage.
In this embodiment, an example in which the sealing material 6 is applied to the joint portion 12 has been described. However, the sealing material 6 may be applied to at least one of the joint portion 12 and the nonwoven fabric tape 2. In particular, when the sealing material 6 is applied to both the joint portion 12 and the nonwoven fabric tape 2, the nonwoven fabric tape 2 can be brought into close contact with the remaining mold panel 11, and the gap 13 of the joint portion 12 can be reliably closed.

Instead of the nonwoven fabric tape 2 of the water leakage prevention tape 1 used in the water leakage prevention construction method of the first embodiment to the third embodiment, an elastomer resin tape having instantaneous water absorption and expandability can also be used. The water leakage prevention tape 1 has the same configuration as that of the first embodiment except that an elastomer resin tape is used instead of the nonwoven fabric tape 2.
This elastomer resin tape has a strip shape and is designed to have an arbitrary size. As the elastomer resin tape, for example, a tape having a thickness of about 0.5 mm to 5.0 mm and a width of about 10 mm to 50 mm can be used.
As this elastomer resin tape, for example, a tape in which an instantaneous water-swellable water-absorbing layer composed of a polymer absorber (SAP) is laminated on the surface of a base material composed of an olefin layer can be used.
The water leakage prevention construction method using the water leakage prevention tape provided with the elastomer resin tape can be carried out in the same manner as the method described in the first embodiment to the third embodiment.
Even when the water leakage prevention tape 1 including the elastomer resin tape is used, when the rainwater or the like enters, the skin separation gap 21 and the gap 13 of the joint portion 12 can be reliably closed.

  The first embodiment to the third embodiment have been described above. In addition to the above, unless otherwise departing from the gist of the present invention, the configuration described in the above embodiment is selected or appropriately changed to another configuration. Is possible.

For example, the nonwoven fabric tape 2 can contain a polymer absorbent (SAP). In this case, the polymer absorber expands and gels, and rainwater becomes jelly-like. Therefore, rainwater cannot enter the skin separation gap 21 and the gap 13 of the joint portion 12.
Moreover, in 2nd embodiment, the waterproof resin layer 5 of the water leak prevention tape 1 can also be attached not to the whole surface of the nonwoven fabric tape 2, but to a part. Further, the sealing material 6 is not limited to the above-described material, and any material may be used as long as it closes the gap 13 of the joint portion 12 and adheres the remaining mold panel 11 and the nonwoven fabric tape 2.
Moreover, the nonwoven fabric which has instantaneous water absorption expansion | swelling property differs in the expansion speed and the degree of expansion | swelling according to the difference in the kind of fiber, the contained substance, etc., and the kind of fiber etc. which comprise are selected according to a use. Therefore, the installer of the remaining mold 10 in the present embodiment can appropriately select the nonwoven fabric tape 2 having a predetermined expansion speed and degree of expansion according to the construction conditions such as the moisture content of the consolidated material.

1 Water leakage prevention tape (water leakage prevention tape) for joints of remaining formwork panels
2 Nonwoven fabric tape 3 Double-sided adhesive waterproof resin layer 4 Release sheet 5 Waterproof resin layer 6 Sealing material 10 Residual mold 11 Residual mold panel 12 Joint part 13 Crevice 20 Concrete (solidification material)
21 Skin separation gap 100 Remaining formwork panel (remaining formwork)
101 Gap 102 Waterproof tape 103 Concrete 104 Joint part 105 Skin separation gap

Claims (2)

A strip-shaped nonwoven fabric tape that is provided to block the gaps in the joints of the remaining formwork panel to prevent water leakage, has instantaneous water absorption and expandability, has a thickness of approximately 0.5 mm to 10 mm, and a width of approximately 10 mm to 50 mm. Alternatively, the method for preventing water leakage at the joint portion of the remaining mold panel is to prevent water leakage at the joint portion of the residual mold panel by using the water leakage prevention tape at the joint portion of the residual mold panel provided with the elastomer resin tape. Because
A release sheet is attached to at least one of the joint portion, the nonwoven fabric tape, or at least one of the joint portion and the elastomer resin tape so that a margin of approximately 5 mm remains on both ends of the nonwoven fabric tape or the elastomer resin tape. Affixed double-sided adhesive waterproof resin layer,
The release sheet is peeled off to expose the adhesive surface, and the residual mold is attached with the water leakage prevention tape on the joint part of the residual mold panel so that the joint part and the center of the double-sided adhesive waterproof resin layer width coincide with each other. By pressing and closely contacting the panel, the gap between the joints is generally closed,
The nonwoven fabric tape or the elastomer resin tape expands due to excess water or rainwater infiltrating the back of the residual form panel, and the remaining skin separation gap is automatically closed. By
Simple and highly efficient, and prevents water leakage from the gap between the joints of the remaining formwork panel over a long period of time, dramatically improving the reliability of water leakage prevention,
A method for preventing water leakage at the joints of the remaining formwork panel. A strip-shaped nonwoven fabric tape that is provided to block the gaps in the joints of the remaining formwork panel to prevent water leakage, has instantaneous water absorption and expandability, has a thickness of approximately 0.5 mm to 10 mm, and a width of approximately 10 mm to 50 mm. Or use an elastomer resin tape,
A method for preventing water leakage at the joint portion of the residual mold panel, which prevents water leakage at the joint portion of the residual mold panel, wherein the joint portion, at least one of the nonwoven fabric tape, or the joint portion, the elastomer resin. Apply a sealing material for adhesive waterproofing to at least one of the tapes in advance, and before the adhesive force of this sealing material disappears, the joint portion and the nonwoven fabric tape width or the joint portion and the center of the elastomer resin tape width By pressing the nonwoven fabric tape or the elastomer resin tape against the remaining formwork panel so as to be in close contact with each other, the gap between the joints is accurately closed,
The nonwoven fabric tape or the elastomer resin tape expands due to excess water or rainwater infiltrating the back of the residual form panel, and the remaining skin separation gap is automatically closed. By
Simple and highly efficient, and prevents water leakage from the gap between the joints of the remaining formwork panel over a long period of time, dramatically improving the reliability of water leakage prevention,
A method for preventing water leakage at the joints of the remaining formwork panel.

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