JP7604420B2 - Waterproof structural wall, water tank and construction method for water tank - Google Patents

Description

Patent Act Article 30, Paragraph 2 applicable Exhibition date: April 15, 2022 Exhibition name: Exterior x Garden Exhibition 2022 Venue: Makuhari Messe Hall 4 & 5 2-1 Nakase, Mihama-ku, Chiba City

The technical field of this specification relates to a waterproof wall structure that is easy to construct, a water tank using this waterproof wall structure, and a construction method for this water tank.

As an example of a water tank that has traditionally used a waterproof structural wall, Patent Document 1 describes a swimming pool that includes a wall member made of concrete and a coating member that covers the boundary between the wall surface and the bottom surface of the wall member. Patent Document 2 describes a swimming pool that uses natural stone for the wall member.

JP 2021-092048 A International Publication No. WO2020/193635

Conventional waterproof structural walls use concrete walls and natural stone for the wall components, and the entire structure is made up of heavy materials, which means that they cannot be easily constructed.

The problem that the technology of this specification aims to solve was made in consideration of the above points, and aims to provide a waterproof structural wall, a water tank, and a construction method for a water tank that can be easily constructed.

The waterproof structure wall according to the embodiment of the present specification is a waterproof structure wall surrounding a water tank,
The structure is made of lightweight panels erected along the periphery of the water tank,
The lightweight panel and the adjacent lightweight panel arranged in the circumferential direction of the water tank are joined together,
The two lightweight panels are joined on their butt surfaces by providing a notch recess along the up-down direction,
By butting the butt surfaces of the two lightweight panels together, through holes are formed from the opposing notched recesses,
A support member for supporting the lightweight panel is erected in the through hole from the installation surface, and a bonding cement molding for bonding the lightweight panels to each other and the support member is filled in the through hole;
A waterproof coating layer may be provided on the side of the lightweight panel that faces the inside of the water tank.

According to the waterproof wall according to the embodiment of this specification, the through holes can be filled with a joining cement molding to join the lightweight panels to the support member, thereby forming a waterproof wall for the water tank. In addition, a waterproof coating layer is provided on the side of the lightweight panel that forms the inside of the waterproof wall for the water tank, so that the inside of the waterproof wall for the water tank can be made waterproof. Therefore, the waterproof wall according to the embodiment can be easily constructed.

In addition, in the waterproof structural wall, the abutment portion between the portions of the butt surfaces where the two lightweight panels are joined, other than the recessed portions, can be filled with caulking material.

By doing this, the contact area where the two lightweight panels are joined is filled with caulking material, which improves the waterproofing of the contact area.

Here, the water tank according to the embodiment is a water tank provided with the above-mentioned waterproof structure wall,
The caulking material is filled into a connection portion where a bottom surface formed on the installation surface of the water tank and the lightweight panel are connected,
The waterproof covering layer may be integrally formed on the side and bottom surfaces of the lightweight panel which form the inside of the water tank.

This will improve the water resistance of the water tank.

In addition, in the water tank, the waterproof coating layer may have an elongation rate (ASTM D-412) of 100% or more.

This allows the waterproof coating layer to adapt to deformations caused by thermal expansion of the water tank and vibrations due to external factors, further improving the waterproofing of the water tank.

The water tank may also be configured so that a top coat protective layer is provided on the surface of the waterproof coating layer.

This will help prevent deterioration of the waterproof coating layer.

Here, the construction method for the water tank according to the embodiment is the construction method for the water tank described above,
an erecting step of erecting the support member on the installation surface along the periphery of the water tank;
an installation process of installing the lightweight panels along the plurality of support members that are set upright, inserting the support members into the through holes formed between the installed lightweight panels, bonding the abutment portions where the lightweight panels are joined with the caulking material, bonding the connection portions where the lightweight panels are connected to the bottom surface with the caulking material, and installing the lightweight panels;
a step of filling the through hole with a slurry of a joint cement composition forming the joint cement shaped article;
a coating step, which is carried out after the filling step, of coating a resin that forms the waterproof coating layer on the side surface of the lightweight panel that will become the inside of the water tank and on the bottom surface of the water tank;
The present invention is characterized by having the following:

According to the construction method for the water tank of the embodiment, through holes are formed between the lightweight panels, and by filling the through holes with a slurry of the joining cement composition, the lightweight panels can be joined to each other and the support member, resulting in excellent construction properties.

The construction method for the water tank described above may further include a refilling step, which, after the installation step, refills the abutment portions where the lightweight panels are joined together with caulking material from inside the water tank by applying it by pressing.

This allows the caulking material to be filled without gaps at the joints where the lightweight panels are joined, improving the waterproofing of the joints.

The waterproof structural wall, water tank, and water tank construction method described in this specification allow for easy construction.

1 is an image diagram of a vertical cross section of an example of a pool as a water tank equipped with a waterproof structural wall of the first embodiment. FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 with a partially enlarged view. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 2 is a perspective view showing a joint between lightweight panels that constitute a waterproof structural wall. This is a cross-sectional plan view of a joint in a lightweight panel during construction. FIG. 11 is an image diagram of a vertical cross section of an example of a pool as a water tank having a waterproof structural wall of the second embodiment.

The following describes a waterproof wall, a water tank equipped with a waterproof wall, and a method for constructing a water tank according to an embodiment of this specification. The waterproof wall of the embodiment is used as a wall that serves as a structure surrounding the water tank. The water tank of the embodiment can be used as a pool used for swimming or bathing, a bathtub used for bathing the whole body or feet, a pond used for ornamental purposes such as raising fish and the like as needed, or an aquarium for storing water. In the embodiment, a pool used for swimming or bathing will be described as an example.

As shown in FIG. 1, the pool 1 as a water tank equipped with the waterproof wall 100 of the first embodiment is provided with the waterproof wall 100 surrounding the periphery of the pool 1 and the bottom surface 201 that forms the bottom of the pool 1, and the waterproof coating layer 150 is integrally formed on the side surface and bottom surface 201 of the waterproof wall 100 that forms the inside of the pool 1. Here, as shown in FIG. 1, the up and down of the pool 1 refers to the up and down when the pool 1 is installed, and the front, back, left and right refer to the longitudinal direction of the pool 1 as the front-back direction and the short side direction as the left-right direction, as shown in FIG. 2 for convenience. Note that, as used in the drawings, F indicates the front, B indicates the back, U indicates the top, D indicates the bottom, L indicates the left, and R indicates the right. In addition, the inside or outside may be expressed based on the inside of the pool 1, and the direction in which the waterproof wall 100 is installed based on the center of the pool 1 may be expressed as the circumferential direction.

The waterproof structural wall 100 surrounding the pool 1 has a structure of multiple rectangular lightweight panels 110 erected from a bottom surface 201 that is poured into the installation surface 200 with concrete, and the lightweight panels 110 are supported by support members 140 poured into the installation surface 200.

As shown in Figures 2 and 4, the abutting surfaces 111 of adjacent lightweight panels 110 are joined together to form a continuous waterproof structural wall 100 that closes the perimeter of the pool 1.

As shown in FIG. 4, the lightweight panels 110 forming the waterproof structural wall 100 have a rectangular cross-sectional cutout recess 112 along the vertical direction formed on the butt surfaces 111 where the panels are joined, and by butting the butt surfaces 111 of the lightweight panels 110 adjacent in the circumferential direction together, a through hole 113 is formed in the vertical direction from the opposing cutout recess 112. Note that, as shown in FIG. 2, the joining of the lightweight panels 110 at the corners of the pool 1 as the waterproof structural wall 100 is performed by providing a cutout recess 112 along the vertical direction at the butt end of the surface (surface perpendicular to the thickness direction) of one of the lightweight panels 110.

The support member 140 cast into the installation surface 200 is inserted into the through hole 113, which is filled with a slurry of a bonding cement composition. The slurry of the bonding cement composition hardens to form a bonding cement molding 130, thereby bonding the lightweight panels 110 to each other and the support member 140 to each other.

The lightweight panel 110 may be made of polystyrene foam (EPS (expandable polystyrene beads)) which is easy to mold by bead foaming, and may have a thickness of 150 to 500 mm, a bulk density of 17 to 33 kg/m ³ , and an expansion ratio of 30 to 60. The lightweight panel 110 can be easily cut with a cutter knife or the like, so that the size of the lightweight panel 110 can be easily adjusted. Therefore, the size of the pool 1 as a water tank can be freely set. The height of the lightweight panel 110 may be 300 to 2000 mm.

The notch recess 112 formed in the butt surface 111 of the lightweight panel 110 is sized so that it can be easily filled with the slurry of the bonding cement composition that forms the bonding cement molding 130 when the butt surfaces 111 are butted together to form a through hole 113, and the width WI in the thickness direction and the depth DE in the surface direction shown in Figure 5 can each be 30 to 100 mm.

The support members 140 used between the panels can be L-shaped steel angles with sides of 30 to 100 mm. The support members 140 are cast and fixed into the installation surface 200 on which the lightweight panels 110 are to be installed so that their longitudinal direction (length direction) is perpendicular to the installation surface 200, and so that the imaginary line connecting both ends of the L-shaped angle in the cross section in the short side direction (horizontal direction) is parallel to the connection direction of the lightweight panels 110, as shown in Figures 2 and 5.

The bonding cement composition is a powdered material in which cement, aggregate, and other additives are uniformly mixed. When the cement composition is mixed with water, it becomes a slurry (paint) that has fluidity and can be applied or filled. When the cement in the slurry hardens through a hydration reaction, the slurry of the cement composition becomes a hardened cement product (bonding cement product 130).

The joint cement composition can be a blend of cement-based non-shrink grout material with cement and aggregate. If only the cement-based non-shrink grout material is used, the slurry has high fluidity and may leak out from the gaps between the lightweight panels 110. Therefore, the fluidity of the slurry is reduced by blending the cement and aggregate. In addition, the joint cement composition maintains the non-shrink property of the cement-based non-shrink grout material, and there is almost no shrinkage when the slurry of the joint cement composition is filled into the through hole 113 and hardens. Therefore, there is almost no gap due to shrinkage between the joint cement molding 130 formed from the slurry of the joint cement composition and the through hole 113, and it is possible to prevent the water in the pool 1 from entering the waterproof structural wall 100 made of the lightweight panels 110. Any commercially available cement-based non-shrink grout material can be used as the cement-based non-shrink grout material.

Cement types specified in JIS R 5210:2019 can be used, and aggregates can include silica sand, cold water sand, crushed stone powder, celben (crushed sanitary ceramics), and shirasu balloons.

The mixing ratio of the joint cement composition is 100 parts by mass of cement-based non-shrink grout material, 20 to 100 parts by mass of cement, and 100 to 200 parts by mass of aggregate. The amount of water added is adjusted so that the 100 mm PVC flow test value (JASS 15 M-103) of the slurry of the joint cement composition is 125 to 250 mm. This is because the slurry of the joint cement composition has excellent fluidity. If the 100 mm PVC flow test value is less than 125 mm, the fluidity of the slurry of the joint cement composition is poor, and there is a risk of poor filling of the through hole 113. On the other hand, if the 100 mm PVC flow test value is more than 250 mm, the fluidity of the slurry is high, and there is a risk of the slurry leaking out from the gap between the lightweight panels 110. More preferably, the amount of water added is adjusted so that the 100 mm PVC flow test value of the slurry of the joint cement composition is 150 to 200 mm.

The test method for the 100 mm PVC flow test value (mm) (JASS 15 M-103 "Quality standard for self-leveling materials") is as follows: A PVC pipe (internal volume: 196 mL) with an inner diameter of 50 mm and height of 100 mm is placed on a polished glass plate with a thickness of 5 mm, and after filling it with a slurry of the cement composition, the pipe is lifted up, and once the slurry has stopped spreading, the diameters are measured in two perpendicular directions, and the average is taken as the flow test value (mm).

Before the slurry of the bonding cement composition is filled, each of the butt surfaces 111, which are the abutting portions 114 between the lightweight panels 110 where the through holes 113 are formed, and each of the connection portions 115 between the lightweight panels 110 and the bottom surface 201 where the lightweight panels 110 stand up, are previously bonded with a caulking material 120. This prevents the slurry of the bonding cement composition from leaking and improves the waterproofing when used as a pool 1.

The caulking material 120 is a material that waterproofs and bonds the contact parts 114 between the lightweight panels 110 and the connection parts 115 between the lightweight panels 110 and the bottom surface 201. The caulking material 120 may be made of moisture-curing silicone caulking material, urethane caulking material, dry-curing acrylic caulking material, butyl rubber caulking material, or the like. Of these, moisture-curing caulking material that shrinks less when cured is preferably used.

The caulking material 120 can be replenished by pressing the material onto the abutment areas 114 where the lightweight panels 110 come into contact from inside the pool 1, which serves as a water tank. This allows the abutment areas 114 of the lightweight panels 110 to be filled with the caulking material 120 without leaving any gaps, improving the waterproofing of the abutment areas 114. Note that pressing is a method of applying a thin, smooth coating of the material (caulking material 120) by pressing it into the abutment areas 114 with a plastering trowel in a rubbing motion.

The sides and bottom surface 201 of the lightweight panel 110 that forms the inside of the pool 1 as a water tank are coated with resin to form a waterproof coating layer 150 that provides waterproofing, and a top coat material that forms a top coat protective layer 160 is applied to the surface of the waterproof coating layer 150 made of resin.

The waterproof coating layer 150 is formed on the inside of the pool 1 as a water tank and provides waterproofing to the pool 1 as a water tank. A resin with an elongation rate (ASTM D-412) of 100 to 1000% can be used. With an elongation rate of 100 to 1000%, the waterproof coating layer 150 can follow the deformation of the pool 1 as a water tank due to thermal expansion and vibration due to external factors, and can ensure waterproofing. If the elongation rate of the waterproof coating layer 150 is less than 100%, it cannot follow the deformation of the pool 1, and there is a risk that cracks will occur in the waterproof coating layer 150 and waterproofing will not be ensured. On the other hand, if the elongation rate of the waterproof coating layer 150 exceeds 1000%, waterproofing can be ensured, but the waterproof coating layer 150 will become flexible and soft, making it easier for dirt to adhere to it and causing discomfort to users of the pool 1. More preferably, the elongation of the waterproof coating layer 150 is 150 to 800%, and even more preferably, 200 to 600%.

As the resin for forming the waterproof coating layer 150, general-purpose resins such as urea resin, urethane resin, silicone resin, and acrylic resin can be used. Among these, urea resin and urethane resin, which can be instantly cured, are more preferable, and urea resin, which is less prone to hydrolysis, is more preferable. Urea resin (polyurea) is a resin produced by mixing an isocyanate component and an amine component at the tip of a spray gun. Urethane resin (polyurethane) is a resin produced by mixing an isocyanate component and a polyol component at the tip of a spray gun. A mixture of urea resin and urethane resin can also be used as the resin for forming the waterproof coating layer 150. The resin for forming the waterproof coating layer 150 can be colored with a pigment or colored aggregate.

The amount of application of the waterproof coating layer 150 can be 0.5 to 5 kg/m ² (film thickness: about 0.5 to 5 mm). This is because a sufficient waterproof effect can be exhibited. If the amount of application of the waterproof coating layer 150 is less than 0.5 kg/m ² , the film thickness is thin, and when an impact is received from an external factor, the waterproof coating layer 150 may crack or peel off, and the waterproofness may not be maintained. On the other hand, if the amount of application of the waterproof coating layer 150 exceeds 5 kg/m ² , although the waterproofness is maintained, the film thickness becomes excessive, and it may be uneconomical. More preferably, the amount of application of the waterproof coating layer 150 is 1 to 4 kg/m ² (film thickness: about 1 to 4 mm), and even more preferably, it is 2 to 3 kg/m ² (film thickness: about 2 to 3 mm).

The topcoat protective layer 160 is applied to prevent ultraviolet degradation of the waterproof coating layer 150. The topcoat material forming the topcoat protective layer 160 is applied to the inside of the pool 1 as a water tank, so a general-purpose paint with excellent water resistance can be used. The resin composition of the topcoat material forming the topcoat protective layer 160 can be urethane resin, epoxy resin, fluororesin, silicone resin, acrylic resin, etc. Among these, urethane resin, epoxy resin, fluororesin, and silicone resin, which have excellent water resistance, can be preferably used, and urethane resin and epoxy resin can be more preferably used from the viewpoint of versatility.

The topcoat material that forms the topcoat protective layer 160 can be either enamel paint or clear paint, but if the waterproof coating layer 150 is colored with pigments or colored aggregates, it is preferable to use clear paint, which can give depth to the waterproof coating layer 150.

The following describes a method for constructing a pool 1 using the waterproof structural wall 100 of the embodiment.

Before constructing pool 1, as shown in FIG. 1, a supply port 301 for supplying water, an inlet 302 for sucking in water to purify it, and an outlet 309 for returning purified water to pool 1 are arranged according to the locations in pool 1. A circulation pipe 303 is formed from the inlet 302 to the outlet 309, and water sucked in from the inlet 302 passes through the circulation pipe 303 and is circulated through the hair collector 304, pump 305, filter 306, boiler 307, and sterilizer 308 in that order, where it is purified and returned to pool 1 from the outlet 309. When the water is replaced, it is discharged from pump 305.

The construction method of the pool 1 in the embodiment includes an erection process in which the support members 140 are erected while the bottom surface 201 is cast on the installation surface 200, an installation process in which the lightweight panels 110 are installed along the installed support members 140, a filling process in which a slurry of a bonding cement composition is filled into the through holes 113 between the lightweight panels 110, a coating process in which a resin that forms a waterproof coating layer 150 is applied to the sides of the lightweight panels 110 and the bottom surface 201 of the pool 1, and a topcoat process in which a topcoat material that forms a topcoat protective layer 160 is applied to the surface of the waterproof coating layer 150.

The lightweight panel 110 forming the framework of the waterproof structural wall 100 of the pool 1 was made of polystyrene foam (EPS) with an expansion ratio of 50, a bulk density of 20 kg/ ^m3 , a thickness of 200 mm, and a height of 500 mm. The notched recess 112 provided in the lightweight panel 110 was provided at the center in the thickness direction of the butting surface 111, with a width WI in the thickness direction of 50 mm and a depth DE in the surface direction of 60 mm.

In the erection process, an embedding hole 202 (FIG. 1) for embedding the lower side of the support member 140 was provided in the installation surface 200 along the periphery of the pool 1 in accordance with the location where the lightweight panel 110 was to be connected and installed, and the support member 140 was erected from the embedding hole 202. The support member 140 to be placed between the lightweight panels 110 was an L-shaped angle with a side length of 50 mm. The support member 140 was placed so that the imaginary line connecting both ends of the L-shaped angle in the cross section in the short side direction (horizontal direction) was parallel to the connection direction of the lightweight panel 110 to be installed, and each was installed so that the longitudinal direction was perpendicular to the location where the pool 1 was to be installed. After that, concrete slurry was poured in the area that would become the installation surface 200 of the pool 1. As the concrete slurry hardens, the bottom surface 201 of the pool 1 is formed on the installation surface 200.

As shown in FIG. 2, the process of installing the lightweight panels 110 involves arranging the lightweight panels 110 that will become the outer peripheral walls of the pool 1 in accordance with the installed support members 140. The arranged lightweight panels 110 have notched recesses 112 along the vertical direction of the butt surfaces 111, so that when the lightweight panels 110 are installed, through holes 113 are formed from the notched recesses 112 in the butt surfaces 111 of the lightweight panels 110. As the two lightweight panels 110 are installed with the support members 140 in between, the support members 140 are inserted into the through holes 113 formed from the notched recesses 112.

As shown in FIG. 5, a silicone-based caulking material 120 was applied to the butt surfaces 111, which are the abutment parts 114 between the lightweight panels 110 and which are the joints of the through holes 113, to bond the lightweight panels 110 together. The caulking material 120 was also applied to the connection parts 115 between the lightweight panels 110 and the bottom surface 201 to bond the lightweight panels 110 and the bottom surface 201 together. As a result, the abutment parts 114 between the lightweight panels 110 and the connection parts 115 between the lightweight panels 110 and the bottom surface 201 are filled with the caulking material 120, and all joint parts of the side and bottom surfaces surrounding the pool 1 are covered with the caulking material 120. The caulking material 120 was applied to the butt surfaces 111 between the lightweight panels 110, which are the joints of the through holes 113, by pressing and applying the caulking material 120 from the inside of the pool 1 as a water tank, thereby improving the waterproofing of the abutment parts 114.

After the caulking material 120 has hardened, as shown in FIG. 6, in order to prevent the slurry of the bonding cement composition to be filled in the next filling step from leaking out of the weakly bonded parts of the caulking material 120, plate-shaped support materials 121 that prevent the upper end side of the through holes 113 from opening are placed on both sides of the upper end spanning between the lightweight panels 110 and fixed with clamps (not shown).

In the filling step, the through hole 113 was filled with a slurry of the bonding cement composition. The amount of water added to the bonding cement composition slurry was adjusted so that the 100 mm PVC flow test value was 125 to 250 mm. The bonding cement composition slurry with a 100 mm PVC flow test value of 125 to 250 mm has an appropriate fluidity, making it easy to fill the through hole 113. Therefore, the pool 1 as a water tank in the embodiment can be made to have excellent workability during construction. In the embodiment, the bonding cement composition slurry used had the following composition:

Grout material 100 parts by weight Ordinary Portland cement (JIS R 5210:2019) 50 parts by weight Silica sand No. 6 (average particle size (d50): approximately 0.37 mm) 150 parts by weight Mixing water 39.1 parts by weight Preyurocks Super (a cement-based non-shrink grout material manufactured by Pacific Materials Co., Ltd.) was used as the grout material.

The 100 mm PVC flow test value (JASS 15 M-103) of the bonding cement composition slurry was 172 mm. The bonding cement composition slurry is poured into the through hole 113, and the bonding cement composition slurry hardens, forming a bonding cement molding 130 in the through hole 113, and a waterproof structural wall 100 consisting of multiple lightweight panels 110 is formed along the perimeter of the pool 1.

After the filling process, it is confirmed that the slurry of the bonding cement composition has hardened and the bonding cement product 130 has been formed, and secondary materials such as the support material 121 are removed.

In the coating process, a resin for forming the waterproof coating layer 150 is applied to the side and bottom surface 201 of the lightweight panel 110 that will be the inside of the pool 1 as a water tank. In this embodiment, a urea resin formed by mixing an isocyanate component and an amine component at the tip of a spray gun and colored blue with a pigment is used as the resin for forming the waterproof coating layer 150. The waterproof coating layer 150 made of urea resin in this embodiment has an elongation rate (ASTM D-412) of 300%, and the coating amount is 2.0 kg/ ^m2 (film thickness: about 2.0 mm).

A topcoat material that forms a topcoat protective layer 160 is applied to the surface of the waterproof coating layer 150 formed from resin. In the embodiment, a general-purpose urethane resin clear paint is used, and the amount of paint applied is 0.8 kg/m ² (film thickness: about 0.8 mm).

According to the waterproof structure wall 100 according to the embodiment of the present specification, the through hole 113 is filled with a slurry of a joint cement composition that forms the joint cement molding 130, so that the lightweight panels 110 can be joined to each other and the support member 140, and the waterproof structure wall 100 of the water tank can be formed. In addition, the resin that forms the waterproof coating layer 150 is applied to the side of the lightweight panel 110 that is the inside of the waterproof structure wall 100 of the water tank, so that the inside of the waterproof structure wall 100 of the water tank can be made waterproof. Therefore, the waterproof structure wall 100 according to the embodiment can be easily constructed because the waterproof structure wall 100 of the water tank can be formed by filling the through hole 113 with a slurry of the joint cement composition, and the waterproof structure wall 100 can be made waterproof by applying the resin to the inside of the waterproof structure wall 100.

The waterproof structural wall 100 of the pool 1 serving as a water tank in the embodiment can also be modified in configuration as follows:

The waterproof structural wall 100 of the embodiment is used as a waterproof structural wall 100 for a pool 1 used as a water tank for swimming and bathing, but the waterproof structural wall 100 of the embodiment can also be used as a waterproof structural wall 100 for a bathtub used for whole body or foot bathing, a pond used for keeping fish and the like for ornamental purposes if necessary, or an aquarium for storing water, in addition to the pool 1.

In the waterproof structural wall 100 of the embodiment, the lightweight panel 110 uses polystyrene foam (EPS), which is easy to mold by bead foaming, but the lightweight panel 110 can be any lightweight panel. Polymer foam and inorganic foam can be used as the material for the lightweight panel. As the polymer foam, polystyrene foam, polyurethane foam, polyphenol foam, polyolefin foam (polyethylene foam, polypropylene foam), etc. can be used. As the inorganic foam, aluminum hydroxide foam (Talbocel), cement-based foam (ALC (autoclaved lightweight aerated concrete)), etc. can also be used.

In the waterproof structural wall 100 of the embodiment, the lightweight panel 110 uses EPS with an expansion ratio of 50 times, but any expansion ratio between 30 and 60 times can be used as the EPS for the lightweight panel 110. If the expansion ratio of the EPS is less than 30 times, a large amount of resin (beads) is required, which may be uneconomical. On the other hand, if the expansion ratio of the EPS is more than 60 times, the strength is weak and there is a risk of plastic deformation when it receives an impact. More preferably, the expansion ratio of the EPS is 40 to 55 times.

The cutout recess 112 provided in the lightweight panel 110 of the embodiment has a rectangular cross section, a width WI in the thickness direction of 50 mm, and a depth DE in the surface direction of 60 mm, but the width WI and depth DE can each be 30 to 100 mm. If the width WI and depth DE are 30 to 100 mm, the through hole 113 formed by the cutout recess 112 can be easily filled with the slurry of the bonding cement composition that forms the bonding cement molding 130. If the width WI and depth DE are each less than 30 mm, the through hole 113 is thin and the filling property of the slurry of the bonding cement composition may be poor. On the other hand, if the width WI and depth DE are each more than 100 mm, although the filling property of the slurry of the bonding cement composition is excellent, the amount of the bonding cement composition used may be large, which may be uneconomical. More preferably, the width WI and depth DE are each 40 to 90 mm, and even more preferably, 50 to 80 mm. In addition, the cross section of the cutout recess 112 is not limited to a rectangular shape, and can be, for example, semicircular, as long as it can be easily filled with the slurry of the bonding cement composition.

In the embodiment, an L-shaped angle with a side length of 50 mm is used for the support member 140, but an L-shaped angle with a side length of 40 to 50 mm can be used. Furthermore, the support member 140 is not limited to this, and can be a flat bar, or any other material that reinforces the joint cement molding 130, such as reinforcing bars, deformed reinforcing bars, or steel frames, can be used.

In the embodiment of the lightweight panels 110 of the waterproof structural wall 100 of the pool 1, the lightweight panels 110 are joined together and the gaps between the lightweight panels 110 are sealed using caulking material 120, but if there are gaps between the lightweight panels 110 to be joined, a panel made of the same material as the lightweight panels 110 can be processed to a size that fills the gap, thereby sealing the gaps between the lightweight panels 110.

In the embodiment of the waterproof wall 100 of the pool 1, the bottom surface 201 is cast on the installation surface 200 while the support member 140 is installed in the embedding hole 202 of the installation surface 200, but the support member 140 can also be installed after the bottom surface 201 is cast. In this case, a hole for embedding the support member 140 is made using a hammer drill or the like at the location of the waterproof wall 100 on the bottom surface 201 where the lightweight panel 110 is to be installed, and the support member 140 is erected in the hole. The same slurry of cement composition as that used to form the joint cement molding 130 can be used to fix the support member 140.

In the embodiment of the waterproof structural wall 100 of the pool 1, a refilling process is provided before the application process, in which the caulking material 120 is refilled by pressing from the inside of the pool 1 to the abutment parts 114 where the lightweight panels 110 abut, but the refilling process by pressing can be omitted, provided that the waterproofness of the abutment parts 114 is ensured.

In the embodiment of the waterproof structural wall 100 of the pool 1, the waterproof coating layer 150 is formed on the side of the lightweight panel 110 that is on the inside of the pool 1 and on the bottom surface 201 of the pool 1, but the waterproof coating layer 150 can also be formed on both the inside and outside side surfaces and the top surface of the lightweight panel 110.

In the embodiment of the waterproof structural wall 100 of the pool 1, the thickness of the lightweight panel 110 is the same at the top and bottom, 200 mm, but as shown in FIG. 6, the thickness of the lightweight panel 110 can be made thicker at the bottom than at the top. This allows the thickness of the lightweight panel 110 to be increased according to the water depth, and allows the panel to efficiently withstand water pressure. In addition, as a second embodiment, the lightweight panel 110 in the pool 2 shown in FIG. 6 has a height of 1200 mm, a thickness of 200 mm at the top, and a thickness of 300 mm at the bottom.

Other technical ideas that can be understood from the waterproof structural wall 100 of the pool 1 of the embodiment are described below.

In the waterproof structural wall 100 of the pool 1 of the embodiment, the 100 mm PVC flow test value (JASS 15 M-103) of the slurry of the joint cement composition that forms the joint cement molding can be 125 to 250 mm.

According to this, the 100 mm PVC flow test value of the slurry of the bonding cement composition filled into the through hole is 125 to 250 mm, so the slurry of the bonding cement composition has a suitable fluidity and can be easily filled into the through hole. This makes it possible to achieve excellent workability during construction.

In the waterproof structural wall 100 of the pool 1 of the embodiment, the bonding cement composition can be a composition containing 20 to 100 parts by mass of cement (JIS R 5210:2019) and 100 to 200 parts by mass of aggregate per 100 parts by mass of cement-based non-shrink mortar.

This allows the slurry of the bonding cement composition to have appropriate fluidity, making it easy to fill the through holes. This allows for excellent workability during construction.

In addition, in the waterproof structural wall 100 of the pool 1 of the embodiment, the thickness of the lightweight panel 110 can be made thicker on the lower side than on the upper side.

This allows the thickness of the lightweight panel 110 to be increased according to the water depth, allowing it to efficiently withstand water pressure.

REFERENCE SIGNS LIST 1 Pool 2 Pool 100 Waterproof structural wall 110 Lightweight panel 111 Butt surface 112 Notched recess 113 Through hole 114 Contact portion 115 Connection portion 120 Caulking material 121 Support material 130 Joint cement molding 140 Support member 150 Waterproof coating layer 160 Top coat protective layer 200 Installation surface 201 Bottom surface 202 Buried hole 301 Supply port 302 Suction port 303 Circulation piping 304 Hair collector 305 Pump 306 Filter 307 Boiler 308 Sterilizer 309 Discharge port DE Depth WI Width

Claims (7)

A waterproof structural wall surrounding a water tank,
The structure is made of lightweight panels erected along the periphery of the water tank,
The lightweight panel and the adjacent lightweight panel arranged in the circumferential direction of the water tank are joined together,
The two lightweight panels are joined on their butt surfaces by providing a notch recess along the up-down direction,
By butting the butt surfaces of the two lightweight panels together, through holes are formed from the opposing notched recesses,
A support member for supporting the lightweight panel is erected in the through hole from the installation surface, and a bonding cement molding for bonding the lightweight panels to each other and the support member is filled in the through hole;
A waterproof structural wall characterized in that a waterproof coating layer is provided on the side surface of the lightweight panel that faces the inside of the water tank. The waterproof structural wall according to claim 1, characterized in that a caulking material is filled in the abutting portion between the portions of the butt surfaces where the two lightweight panels are joined, other than the recessed portions. A water tank provided with the waterproof structural wall according to claim 2,
The caulking material is filled into a connection portion between a bottom surface of the water tank formed on the installation surface and the lightweight panel,
A water tank, characterized in that the waterproof covering layer is formed integrally with the side and bottom surfaces of the lightweight panel which form the inside of the water tank. The water tank according to claim 3, characterized in that the waterproof coating layer has an elongation rate (ASTM D-412) of 100% or more. The water tank according to claim 3, characterized in that a top coat protective layer is provided on the surface of the waterproof coating layer. A method for constructing a water tank according to claim 3,
an erecting step of erecting the support member on the installation surface along the periphery of the water tank;
an installation process of installing the lightweight panels along the plurality of support members that are set upright, inserting the support members into the through holes formed between the installed lightweight panels, bonding the abutment portions where the lightweight panels are joined with the caulking material, bonding the connection portions where the lightweight panels are connected to the bottom surface with the caulking material, and installing the lightweight panels;
a step of filling the through hole with a slurry of a joint cement composition forming the joint cement shaped article;
a coating step, which is carried out after the filling step, of coating a resin that forms the waterproof coating layer on the side surface of the lightweight panel that will become the inside of the water tank and on the bottom surface of the water tank;
A construction method for a water tank comprising the steps of: The construction method for a water tank according to claim 6, further comprising a refilling step of refilling the abutting portions where the lightweight panels are joined together from inside the water tank by applying caulking material by pressing after the installation step.

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