JP6173386B2 - Gap sealing structure and gap sealing method - Google Patents

Description

  The present invention relates to a gap sealing structure and a gap sealing method.

  There are many demands for sealing water gaps in devices such as buildings and civil engineering structures, and devices or equipment to ensure water tightness and air tightness. For example, in buildings, there is a need to connect pipes and signal cables through walls and floors to connect the inside and the outside.

  In general, there is a method of filling the gap with silicon, concrete, caulking material, etc. to secure water tightness and air tightness, but it takes man-hours for work, but it has adhesion, flexibility and proof strength Not all-purpose. In particular, high adhesive strength cannot be expected.

  On the other hand, the two-component reactive curable resin cures in a short time and therefore has good workability and adhesiveness, and is suitable as a sealing material as a general performance such as being strong against water and seawater and excellent in durability.

  Typical examples of the two-component reactive curable resin include an epoxy resin, a urethane resin, and a polyurea resin, and are used, for example, as a waterproof coating material (see, for example, Patent Document 1).

JP 2003-166209 A

  It is effective to coat fine cracks with a two-component reactive curing resin, and as described above, a waterproof coating layer is formed.

  However, in recent years, when trying to seal large gaps between members that are displaced by frequent or concerned earthquakes, even if the gap is filled with a sealing material such as silicon, concrete, or caulking material, the displacement It is expected that water peeling and airtightness cannot be secured due to partial peeling and gaps. Moreover, in the place where the pressure which is going to peel this on the sealed sealing material layer acts, peeling tends to occur.

  Therefore, the main subject of this invention is obtaining the space | gap sealing structure and the space | gap sealing method which show the sealing film with favorable peeling resistance.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
The first member is connected to the outer edge of the membrane so that the first member and the second member penetrating through the first member are sealed and the gap between them is sealed. Covered to adhere to the opening inner edge of the film, forming a sealing film that follows the displacement of the voids by expansion and contraction by polyurea resin or polyurethane urea resin,
Wherein the first portion hardly flexible sealing reinforcing member to member, that one end thereof is fixed by a fixture in a state that is not solid in extending Suruga said second member in the gap, the sealing film The portion covering the member to which the sealing reinforcing member is fixed is bonded to the sealing reinforcing member from one end portion of the sealing reinforcing member, and further passes through the other end portion of the sealing reinforcing member. A void sealing structure, wherein a reinforcing member is bonded to a fixed member.

[Invention of Claim 2]
A metal wire mesh or fiber sheet is provided in the middle of the thickness of the sealing film having an average thickness of 1 mm to 10 mm .
The void sealing structure according to claim 1.

(Function and effect)
A polyurea resin or a polyurethane urea resin exhibits “tensile elongation” defined by JIS-K-6251 and exhibits, for example, 300% or more.

Here, a tensile tester is used to obtain tensile strength at a speed of 200 mm / min, strength when the sample is cut (ruptured) (value obtained by dividing the tensile load value by the cross-sectional area of the test piece), and elongation. The tensile elongation is calculated by the following formula.
Tensile elongation (%) = 100 × (L−Lo) / Lo (1)
Lo: sample length before test L: sample length at break

  Therefore, the tensile elongation is large compared to other plastic materials. Moreover, the tensile strength is high when the stress at break is 10 MPa or more, particularly 20 MPa or more.

  Furthermore, the adhesion strength to metals such as steel plates, plastics, rubbers, ceramics and the like is generally higher than that of the aforementioned silicon, concrete, and caulking materials.

  As a result, it covers the first member and the second member so that the gaps between them are sealed so that each member is bonded at the end of the film, and the polyurea resin or polyurethane When a sealing film made of urea resin is formed, a sealing film with good peel resistance is obtained.

  For example, in the covering of cracks, the displacement between members on both sides of the crack is not considered. However, when the tensile elongation of the polyurea resin or polyurethane urea resin according to the present invention is large, the gap between the first member and the second member is displaced by, for example, vibration during an earthquake (mainly, the gap is enlarged and reduced). In this case, it follows a good effect due to expansion and contraction, so that it exhibits a specific effect that can stably seal the gap. Such a high tensile elongation property of the polyurea resin or the polyurethane urea resin functions so as to further improve the peel resistance to the adherend when a displacement occurs due to vibration.

  In a structure in which a first member and a second member penetrating the first member, for example, a pipe, a cable tray, a duct, etc. (hereinafter referred to as “pipes”) are arranged through the wall, a gap between them The first member is covered with the outer edge of the sealing film and the second member is bonded with the inner edge of the opening of the sealing film, and the sealing film is made of polyurea resin or polyurethane urea resin. Even in the form in which is formed, the same effect is obtained.

  As the area where pressure (typically water pressure) acts on the sealing film increases, the peel force increases. Therefore, it is desirable that the area where pressure acts on the sealing film is small. By making the sealing film thick, it becomes possible to suppress deformation and withstand the peeling force. However, since the resin material is expensive, it is not practical.

  Accordingly, since at least one of the first member and the second member has a sealing reinforcement member such as a steel plate that is difficult to be bent, a part of the sealing reinforcement member extends into the gap. The applied pressure acting on the sealing film covering the sealing reinforcing member is small, and the peeling force is reduced. In addition, the sealing film can be adhered to the portion where the sealing reinforcing member extends into the gap, and the adhesion area can be increased, so that the peel resistance can be improved.

(Reference effects)
When sealing the part where the piping penetrates the floor or wall with resin, the expansion and contraction of the sealing film does not follow the displacement between the piping and the member constituting the penetration due to an earthquake, etc., causing peeling or breaking The seal may not be maintained. In order to solve this problem, it is preferable that a non-adhesive portion or a weakly bonded portion that only absorbs displacement is formed at the close boundary of the sealing film. As a result, in the event of an earthquake or the like, the non-bonded portion or the weakly bonded portion is in a peeled state, and the force applied to the sealing film can be relaxed by bending the peeled and separated portion, thereby ensuring watertightness and airtightness.

  Since the sealing film has high expansion and contraction strength and adhesive strength, if the relative displacement between the casing such as the floor and the wall and the piping is large, there is a possibility that the construction object is destroyed. A base material that shows deformation or breakage against displacement in the thickness direction applied during an earthquake is fixed with its thickness end face facing the gap, and the sealing film covers the base material. As a result of the deformation or destruction of the base material, the force applied to the sealing film due to shaking can be alleviated, and watertightness and airtightness can be secured. Moreover, if the site | part which should avoid a damage is previously covered with the base material, it will lead to the damage prevention of the site | part which should avoid a damage.

[Invention of Claim 3]
The first member is connected to the outer edge of the membrane so that the first member and the second member penetrating through the first member are sealed and the gap between them is sealed. Covered to adhere to the inner edge of the opening of the film, forming a sealing film that follows the displacement of the gap by expansion and contraction by polyurea resin or polyurethane urea resin,
Wherein the first portion hardly flexible sealing reinforcing member to member, that one end thereof is fixed by a fixture in a state that is not solid in extending Suruga said second member in the gap, the sealing film The portion covering the member to which the sealing reinforcing member is fixed is bonded to the sealing reinforcing member from one end portion of the sealing reinforcing member, and further passes through the other end portion of the sealing reinforcing member. A gap sealing method comprising forming a reinforcing member so as to be adhered to a fixed member.

[Invention of Claim 4]
The sealing film is formed by spraying, and a metal wire net or a fiber sheet is provided in the middle of a thickness having an average thickness of 1 mm to 10 mm .
The void sealing method according to claim 3.

(Function and effect)
The same effects as those of the first and second aspects are obtained.

(Reference effects)
When the sealing film is formed by spraying polyurea resin or polyurethane urea resin, if the backup material is provided in the target gap, the first member and the second member are straddled during spraying. It becomes easy to form a sealing film, and workability is enhanced. When the resin is sprayed from the non-pressurized side of the backup material, a sufficient bonding area with respect to the voids of the resin (sealing film) can be secured, and a large adhesive strength can be obtained. As a result, the peel strength is increased.

  In this case, as the backup material, in particular, as shown in FIG. 3, the back-up material has a shape in which the center of the cross section draws an arc swelled from the pressure side to the non-pressure side, and has a wedge shape in the gap. Is desirable. This wedge shape can surely increase the adhesion area of the resin (sealing film) to the gap, increase the adhesion area of the resin (sealing film) to the gap, and obtain a larger adhesive strength. As a result, the peel strength is further increased.

  For adhesion of the sealing film to the first member and the second member, it is preferable to form a sealing film of polyurea resin or polyurethane urea resin without applying a primer in the middle part of the film including the part facing the gap. . By not applying a resin primer, the non-bonded portion or the weakly bonded portion can be formed.

  ADVANTAGE OF THE INVENTION According to this invention, the space | gap sealing structure and the space | gap sealing method which show the sealing film with favorable peeling resistance can be obtained.

It is sectional drawing of the basic example of a space | gap sealing structure. It is sectional drawing of the example which provided the sealing reinforcement member. It is sectional drawing of the example which provided the backup material. It is sectional drawing of the example which provided the base material and provided the weak adhesion part. It is sectional drawing of the example which aimed at sealing membrane reinforcement. It is sectional drawing of the example which provided the film thickness reference material. It is sectional drawing of the example which embedded the film thickness measurement board. It is sectional drawing of the example of a process of a leakage part. It is the perspective view It is a perspective view of a spray construction booth example.

Next, the form for implementing this invention is demonstrated.
FIG. 1 shows a basic example of a gap sealing structure. The end of the film is formed so as to straddle the first member 1 and the second member 2 and seal the gap between them. The gap sealing structure is shown in which each member is covered with a sealing film 10 made of polyurea resin or polyurethane urea resin.

  In the present invention, a polyurea resin or a polyurethane urea resin having a large tensile elongation and a high tensile strength as a stress at break is used for forming the sealing film 10.

  As a result, each member is covered with the end portion of the film 10 so as to straddle the first member 1 and the second member 2 and seal the gap between them, so that the polyurea resin or the polyurethane urea is covered. When the sealing film 10 made of resin is formed, the sealing film 10 having good peeling resistance is obtained.

  For example, in the covering of cracks, the displacement between members on both sides of the crack is not considered. However, the large tensile elongation of the polyurea resin or polyurethane urea resin according to the present invention is that the gap between the first member 1 and the second member 2 is displaced by, for example, vibration during an earthquake (mainly the gap is enlarged). And the like, it follows a good effect due to expansion and contraction, and thus exhibits a specific effect that can stably seal the air gap. Such a high tensile elongation property of the polyurea resin or the polyurethane urea resin functions so as to further improve the peel resistance to the adherend when a displacement occurs due to vibration.

  As shown in FIG. 2, a structure in which a first member 1 and a second member 2 passing through the first member 1, for example, piping, a cable tray, a duct (hereinafter referred to as “piping”) piping are arranged through the wall. The first member 1 is covered with the outer edge portion of the sealing film 10 and the second member 2 is bonded with the inner edge portion of the opening of the sealing film 10 so as to seal the gap between them. Even in the case where the sealing film 10 made of polyurea resin or polyurethane urea resin is formed, the same effects can be obtained.

  Similarly, when attention is paid to FIG. 2, a hardly-flexible sealing reinforcing member 11 is fixed to at least one of the first member 1 and the second member 2 in a state where a part thereof extends into the gap S, A gap sealing structure in which the sealing film 10 covers the sealing reinforcing member 11 is also proposed.

  As the area where pressure P (typically, for example, water pressure) acts on the sealing film 10 increases, the peel force increases, so it is desirable that the area where pressure acts on the sealing film 10 be small. By making the sealing film 10 thick, it is possible to suppress deformation and withstand the peeling force. However, since the resin material according to the present invention is expensive, it is not practical.

  Accordingly, a fixing member such as a bolt is provided in a state in which a sealing reinforcement member such as a steel plate, which is difficult to bend, is extended to the gap S at least one of the first member 1 and the second member 2. By fixing with 12, the cross-sectional area of the space S can be reduced, the applied pressure acting on the sealing film 10 covering the sealing reinforcing member 11 becomes small, and the peeling force is reduced. In addition, the sealing film 10 can be adhered to the portion where the sealing reinforcing member 11 extends into the gap S, and the adhesion area can be increased, whereby the peel resistance can be improved. .

  Referring to FIG. 4, for adhesion of the sealing film 10 to the first member 1 and the second member 2, a non-bonded portion or a weakly bonded portion 10 </ b> A is formed in an intermediate portion of the film 10 including a portion facing the gap S. An air gap sealing structure is also proposed.

  When the part where the piping penetrates the floor or wall is sealed with resin, the expansion and contraction of the sealing film 10 does not follow the displacement between the piping and the member constituting the penetration part due to an earthquake or the like, and peeling or breakage occurs. The seal may not be maintained.

  Therefore, according to this example, a non-adhesive portion or a weakly-adhesive portion 10 </ b> A that only absorbs displacement is formed at the tight boundary of the sealing film 10. As a result, in the event of an earthquake or the like, the non-bonded portion or the weakly bonded portion 10A is in a peeled state, and the force applied to the sealing film 10 can be relaxed by bending the peeled and separated portion, thereby ensuring watertightness and airtightness.

  As a method of forming the non-adhesive portion or the weakly-adhesive portion 10A, a primer of polyurea resin or polyurethane urea resin may not be applied, or a non-adhesive liquid may be applied.

  Further, as shown in FIG. 4, at least one of the first member 1 and the second member 2 is provided with a base material 13 that is deformed or broken with respect to a displacement in the thickness direction applied during an earthquake, and its thickness end face is a gap S. A gap sealing structure is proposed in which the sealing film 10 is fixed in a facing state and the sealing film 10 covers the base material 13.

  Since the sealing film 10 has high expansion and contraction strength and adhesive strength, if the relative displacement between the casing such as the floor or wall and the piping is large, there is a possibility that the construction object is destroyed. When the base material 13 which shows deformation or destruction with respect to the displacement in the thickness direction applied at the time of an earthquake is fixed with the thickness end face facing the gap, the sealing film 10 has a structure covering the base material 13. In such a case, as a result of the base material 13 being deformed or broken, the force applied to the sealing film 10 due to shaking can be alleviated, and water tightness and air tightness can be secured. Moreover, if the site | part which should avoid a damage is previously covered with the base material 13, it will lead to the damage prevention of the site | part which should avoid a damage.

  In this case, for example, “Fenova board” manufactured by Sekisui Chemical Co., Ltd. can be used as the base material 13.

  As shown in FIG. 3, a backup material 14 is provided in a gap between the first member 1 and the second member 2 penetrating the first member 1. The sealing film 10 can be formed by spraying polyurea resin or polyurethane urea resin so that the member 1 is covered with the outer edge of the film 10 and the second member 2 is covered with the opening inner edge of the film 10. As the backup material 14, typically, an annular metal plate, corrugated board, plastic plate, or the like made of an appropriate material can be used.

  When the sealing film 10 is formed by spraying polyurea resin or polyurethane urea resin, if the backup material 14 is provided in the target gap S, the first member 1 and the second member 2 It becomes easy to form the sealing film 10 across the substrate and workability is improved. When the resin is sprayed, if the spraying is performed from the non-pressurized side of the backup material 14, the adhesion area of the resin (sealing film 10) with respect to the gap increases, and a large adhesive strength is obtained.

  In this case, the backup material 14 has a shape in which the center of the cross section of the backup material 14 draws an arc that swells from the pressure side toward the non-pressure side, and has a wedge shape in the gap. In particular, as shown in FIG. 3, the backup material 14 has a shape in which the center of the cross section of the backup material 14 draws an arc that swells from the pressure side to the non-pressure side, and has a wedge shape in the gap. Is desirable. This wedge shape can surely increase the adhesion area of the resin (sealing film) to the gap, increase the adhesion area of the resin (sealing film) to the gap, and obtain a high adhesive strength. As a result, the peel strength is increased.

  On the other hand, increasing the thickness of the sealing film 10 increases the film strength. However, this increases the cost of the resin material, which is not preferable. Therefore, as shown in FIG. 5, it is preferable to form the sealing film 10 by providing, for example, a metal wire mesh 15 or a mesh-like fiber sheet in the middle of the thickness. A mesh or mesh is preferable because it has excellent deformability including elongation.

  The sealing film is formed mainly by spraying. Therefore, it is difficult to manage the construction of the film thickness, and there is no choice but to rely on the operator's intuition. However, this is not suitable for quality control, and is desirable because, for example, a pin-shaped film thickness reference material 20 shown in FIG. 6 is fixed to the target surface and spraying is performed on the surface.

  Further, as shown in FIG. 7, the film thickness measuring plate 21 is fixed to the target surface, and the film thickness is measured by the film thickness measuring device 22 that measures the film thickness by the signal attenuation on the surface of the film thickness measuring plate 21. Can also be done.

  The curing time of the polyurea resin or polyurethane urea resin is short, and the workability (film forming property) is excellent. However, as shown in FIG. 8, for example, even when resin is sprayed from the second member 2 to a site where water W or air has already leaked and pressure has been applied, the sealing film 10 is formed and leaked. It is difficult to prevent.

  Therefore, as shown in FIG. 8 and FIG. 9, for example, a metal annular cover 30 with a nozzle 30 </ b> A for releasing the pressure is prepared. A method of spraying resin so as to cover the cover 30 and the second member 2 while releasing water and pressure from the nozzle 30A, and sealing the nozzle 30A with a plug 30B after the resin is completely cured It is preferable to adopt In this case, the cover 30 corresponds to the first member 1 of the present invention.

  When spraying with a polyurea resin or polyurethane urea resin, when spraying with a two-component mixing gun, it is important to prevent the particles from spreading over a wide range. When scattering of particles occurs, the particles adhere and are extremely difficult to remove.

  Therefore, at the time of construction, it is desirable to provide a dedicated construction booth 30 and a dust collection facility 31 for collecting scattered particles as shown in FIG. The construction booth 30 uses an extendable frame 32 and a seat 33 so that the size can be freely changed according to the construction object and interference object, and controls the air flow to prevent the scattered particles from adhering to the outside. In order to prevent this, it is possible to adopt a form in which a mesh or a porous sheet 34 is used for the upper part of the booth 30, sucked from the upper sheet 34, and exhausted from the lower part by the dust collecting equipment 31. Reference numeral 35 denotes an exhaust fan.

  In addition, a water scrubber is originally optimal for collecting the resin scattered particles, but there are cases where water cannot be used. Furthermore, ordinary filters can quickly become clogged and must be replaced many times, which is uneconomical.

  Therefore, it is desirable to use a labyrinth-type collision dust collection equipment 31 that uses the particle size weight and adhesive force of the scattered particles to reliably collide the scattered particles. In this case, as the material of the collision dust collection equipment 31, it is possible to employ a material that is easy to obtain such as corrugated cardboard, cardboard, and various boards and that is economical.

Next, construction and resin materials will be exemplified.
Prior to the formation of the sealing film, a primer can be provided. The primer can be applied by a known method such as roller, brush or spraying alone or in combination. As the primer, for example, an asphalt primer, a resin primer, or the like can be used. Any pavement tar, straight asphalt, cutback asphalt, asphalt emulsion, ethylene vinyl acetate-based or acrylic synthetic resin emulsion, epoxy resin, or the like that is usually used as a primer can be used.

  After the primer is dried, the sealing film 10 is formed. A known method such as spraying can be used to form the sealing film 10. As this polyurea resin or polyurethane urea resin, the touch curing time may be 2 seconds to 60 seconds, and more preferably 5 seconds to 15 seconds. This is because if the touch curing time is too short, it is difficult to obtain the continuity of the sealing film. On the other hand, if it is too long, the mixed liquid before curing flows, and the film formability and work efficiency are lowered. The two-component curable resin is desirably mixed immediately before application of the two components, and a dedicated spray gun that is applied while mixing can be used.

  The average thickness of the sealing film to be formed may be 1 mm to 10 mm, and more desirably 2 mm to 3 mm. This is because if it is too thin, not only the function as a waterproof layer is not sufficient, but also the hole may be easily opened by water pressure. Moreover, it is because there exists a possibility that a projection part may penetrate a waterproof layer partially if it is too thin by the unevenness | corrugation of a foundation | substrate. On the other hand, if the thickness is too thick, the function of the waterproof layer will not change much, but it will not only require a lot of materials and will be wasted, but also the shrinkage stress during curing may hinder the adhesion between the substrate and the waterproof layer. is there. Further, the elongation percentage of the cured resin may be 50% to 1000%, and more preferably 300% to 500%. In order to satisfy the durability due to the load during and after the construction, if it is too small, it may break, and if it is too large, the membrane strength may be reduced and the waterproof function may be lowered.

  The two-part curable resin according to the present invention includes a two-part curable polyurethane resin and / or a polyurea resin. More specifically, some of these resins comprise a polyamine component and / or a polyol component and a polyisocyanate component. What is obtained when a polyamine component is used is a polyurea resin composition, and what is obtained when a polyol component is used is a polyurethane resin composition. Moreover, what is obtained when using a mixture of a polyamine component and a polyol component is a polyurethane / polyurea resin composition. Especially, a polyurea-type resin composition can be used suitably. As such a commercially available product, a polyurea resin handled by one of the applicants of the present invention can be used.

  Although it does not specifically limit as a polyamine component, For example, polyoxyalkylene polyamine, aromatic diamine, and a mixture thereof can be mentioned.

  The polyol component is not particularly limited, and examples thereof include polyether polyol, polyester polyol, and hydroxyl group-containing acrylic resin. Moreover, in order to adjust the physical property of the obtained cured resin film, you may use together the thing of the low molecular weight whose number average molecular weight is 62-1000 and the high molecular weight thing of 1000-about 10,000.

  Examples of the polyisocyanate component include organic polyisocyanates, isocyanate prepolymers, and mixtures thereof.

  The mixing ratio of the polyisocyanate component and the polyamine and / or polyol component is such that the equivalent ratio of the amino group and hydroxyl group in the polyamine and / or polyol component to the isocyanate group in the polyisocyanate component is 1 / 0.7 to A ratio of 1 / 1.5 is preferred.

  The two-component curable resin comprising the polyisocyanate component and the polyamine and / or polyol component is preferably solventless. Moreover, auxiliary agents such as plasticizers, flame retardants, fillers, various stabilizers, colorants and the like that are usually used can be used as necessary.

  The present invention is applicable as a gap sealing structure and a gap sealing method.

DESCRIPTION OF SYMBOLS 1 ... 1st member, 2 ... 2nd member, 10 ... Sealing film, 10A ... Weak adhesion part, 10B ... Primer layer, 11 ... Sealing reinforcement member, 13 ... Base material, 14 ... Backup material, 15 ... Wire mesh, 30 ... cover, W ... water droplet, P ... pressure, S ... gap S.

Claims (4)

The first member is connected to the outer edge of the membrane so that the first member and the second member penetrating through the first member are sealed and the gap between them is sealed. Covered to adhere to the opening inner edge of the film, forming a sealing film that follows the displacement of the voids by expansion and contraction by polyurea resin or polyurethane urea resin,
Wherein the first portion hardly flexible sealing reinforcing member to member, that one end thereof is fixed by a fixture in a state that is not solid in extending Suruga said second member in the gap, the sealing film The portion covering the member to which the sealing reinforcing member is fixed is bonded to the sealing reinforcing member from one end portion of the sealing reinforcing member, and further passes through the other end portion of the sealing reinforcing member. A void sealing structure, wherein a reinforcing member is bonded to a fixed member. A metal wire mesh or fiber sheet is provided in the middle of the thickness of the sealing film having an average thickness of 1 mm to 10 mm .
The void sealing structure according to claim 1. The first member is connected to the outer edge of the membrane so that the first member and the second member penetrating through the first member are sealed and the gap between them is sealed. Covered to adhere to the inner edge of the opening of the film, forming a sealing film that follows the displacement of the gap by expansion and contraction by polyurea resin or polyurethane urea resin,
Wherein the first portion hardly flexible sealing reinforcing member to member, that one end thereof is fixed by a fixture in a state that is not solid in extending Suruga said second member in the gap, the sealing film The portion covering the member to which the sealing reinforcing member is fixed is bonded to the sealing reinforcing member from one end portion of the sealing reinforcing member, and further passes through the other end portion of the sealing reinforcing member. A gap sealing method comprising forming a reinforcing member so as to be adhered to a fixed member. The sealing film is formed by spraying, and a metal wire net or a fiber sheet is provided in the middle of a thickness having an average thickness of 1 mm to 10 mm .
The void sealing method according to claim 3.

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