JPS61232191A - Waterproof execution method of heat accumulating tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for waterproofing a heat storage tank used in a thermal storage heat pump system, a hot water supply system using solar heat, and the like.

In thermal storage heat pump systems, solar hot water supply systems, etc., hot water or cold water is stored as a heat medium in a thermal storage tank, but this thermal storage tank is usually installed in the basement of a building, etc. The bottom wall, side wall, which becomes the frame,
It is generally constructed by forming the top wall with a concrete structure, providing a heat insulating layer on the inner surface, and waterproofing the surface of the heat insulating layer.

Conventionally, mortar waterproofing methods, paint film waterproofing methods, sheet waterproofing methods, etc. have been adopted for waterproofing heat storage tanks, but each of these waterproofing methods has advantages and disadvantages.

Although the mortar waterproofing method is easy to construct, the waterproof layer has low tensile strength and elongation, so cracks are likely to occur, and the waterproof layer is easily damaged due to peeling from the base, cracking of the base, etc.

Epoxy resin, which is often used in paint film waterproofing methods, has good heat resistance and durability, and this method is easy to apply even if the surface shape of the base is complex, and a seamless, integrated layer is formed, so it can be applied even if the surface shape of the base is complex. Waterproofing inside a heat storage tank with a shape has great advantages. However, on the other hand, when such a coating film is formed on the surface of a heat insulating material layer, when the heat insulating material is affected by water pressure or deforms due to thermal expansion or contraction due to temperature differences, the coating film will be affected by this deformation. It cannot be followed and is easily damaged.

In the sheet waterproofing method, a waterproof sheet usually made of vinyl chloride resin is stretched along the inner surface of the heat storage tank, but this waterproof sheet has excellent heat resistance and durability, and can easily follow the deformation of the insulation material. This will not cause any damage. However, conventionally, sheets were joined together using a solvent-based adhesive, which required caution against fire and sufficient ventilation, resulting in poor workability. Furthermore, the reliability of joints made using solvent-based adhesives has not always been sufficient.

し　　　　　　p The inner surface of the heat storage tank is not under uniform conditions throughout.

In other words, a characteristic of a heat storage tank is that the tank is never filled with water, and hot water and cold water are stored below the water immersion line, which is a certain distance from the top wall surface, so the inner surface below the water immersion line is It is affected by water pressure and temperature, but this effect has little effect on the inner surface above the water immersion line. Also,
The inner surface of the top wall of the heat storage tank often has a complex shape with exposed incidental structures such as intermediate beams and pipes, but the inner surface of the lower part has a relatively simple shape.

Therefore, it is not a good idea to uniformly waterproof the inner surface of the heat storage tank, where the structure and environment vary depending on the part, using any one of the above-mentioned conventional waterproofing methods.

0 + Therefore, in the present invention, the side and bottom surfaces of the inner surface of the heat storage tank below the water immersion line are covered with a plurality of thermoplastic sheets, and these thermoplastic sheets are watertightly joined to each other by heat fusion. and applying a coating agent to the top surface of the inner surface of the heat storage tank, and connecting the layer of the coating agent to the upper end of the thermoplastic sheet in a watertight manner.

In this way, in the present invention, since the sheet waterproofing method is adopted for the parts of the lower part of the heat storage tank that are affected by water pressure and temperature, even if the insulation material is deformed by water pressure or thermal expansion or contraction, it can easily follow this deformation. A waterproof layer (tarpaulin sheet) is obtained that will not be damaged. However, if such sheet waterproofing is applied to the top surface, which has a complex shape where intermediate beams and pipes are exposed, it will require a large number of man-hours. Since a coating film waterproofing method with high quality is used, construction costs are reduced. In addition, upward work becomes less labor-intensive and can be mechanized, which has great effects in terms of labor safety. It should be noted that the top surface and the upper side parts following it are not affected by water pressure or temperature, so there is no problem even if a coating film waterproofing method is adopted.

Furthermore, in the present invention, a thermoplastic sheet is used as the waterproof sheet, and each sheet is joined by heat welding, so the workability is better than the conventional joining method using a solvent-based adhesive, and the reliability of the joint is improved. improves. Further, by attaching a fixing member that can be heat-sealed to the thermoplastic sheet along the corners and ridges of the inner surface of the heat storage tank, and heat-sealing the thermoplastic sheet to this fixing member, the thermoplastic sheet can be heat-sealed to the thermoplastic sheet. The sheet can be easily and firmly fixed to the inner surface of the heat storage tank.

Support JLJ Hereinafter, the waterproofing method of the present invention will be explained with reference to the accompanying drawings.

FIG. 1 is a cutaway view showing the inside of a heat storage tank 1 that has been waterproofed by the method of the present invention, and 2 is a concrete frame that constitutes the outer wall of the heat storage tank 1. A heat insulating material layer 6 is fixed to each inner surface of the frame 2 by appropriate means. The heat insulating material layer 6 is made of a heat insulating material such as expanded polystyrene or hard polyurethane. The chain line W indicates the position of the water immersion line, and the hot water and cold water in the main heat storage 11 are stored below this water immersion line W, and the water surface of the hot (cold) water never exceeds this water immersion line W.

If hot (cold) water is directly poured into such a heat storage tank and stored, the hot (cold) water will penetrate into the insulation layer 6, reducing its insulation properties, and will further leak to the outside through the concrete frame. Therefore, it is necessary to perform a waterproofing treatment on the surface of the heat insulating material layer 6, and this waterproofing treatment is performed by the following construction method. That is, the side surfaces 4 and bottom surface 5 below the water immersion line W are covered with a thermoplastic sheet 7, these thermoplastic sheets 7 are watertightly joined to each other by heat fusion, and a coating agent is applied to the top surface 3. A waterproofing treatment is performed by coating the thermoplastic sheet 7 to form a coating layer 8 and connecting the coating layer 8 to the upper end of the thermoplastic sheet 7 in a watertight manner.

More specifically, first, a rigid fixing member 10 is disposed along each ridgeline 9 where the side surface 4 and the bottom surface 5 or the respective side surfaces 4 intersect, and this fixing member 10 is attached to the anchor bolt 11.
Due to the insulation material! ! 6 and lock it to the frame 2.

The fixing member 10 is made of polyethylene, as shown in FIG.
It is constructed by covering a rigid base material 12 made of polypropylene, glass fiber reinforced resin, aluminum plate, etc. with a covering material 13 made of the same material as the thermoplastic sheet 7 and heat-sealable to the thermoplastic sheet 7. In addition, a fixing member having the same configuration and having a shape that matches the corner is secured to a corner where the two side faces 4 and the bottom face 5 intersect.

Then, as described above, a plurality of thermoplastic sheets 7 are stretched along the side surfaces 4 and bottom surface 5 below the water immersion line W and covering the fixing member. Make sure that all the inner surface below W is covered. As the thermoplastic sheet 7, a sheet made of, for example, vinyl chloride resin or a thermoplastic elastomer as disclosed in JP-A-59-18741 may be used. Next, each thermoplastic sheet 7 is watertightly joined to each other by heat fusion, and this joining method is as follows:
The mutually overlapping edges of the thermoplastic sheets 7 may be joined by heat fusion as in the joint part 14a shown in FIG. 1, or each thermoplastic sheet 7 as in the joint part 14b. A band-shaped sheet 15 made of the same material as the sheet 7 may be attached across the mutually abutting edges of the sheet 7, and these may be joined together by heat fusion. A molded sheet 17 molded to match the shape of this portion is attached to the corner portion 16 where the three planes come together.

Further, for example, as shown in FIG. 3, the thermoplastic sheet 7 covering the side surface 4 and the thermoplastic sheet 7 covering the bottom surface 5 are heat-sealed to each other by overlapping their edges along the fixing member 10, Furthermore, the covering material 13 of the fixing member 10 is also thermally fused. In this way, the thermoplastic sheet 7 can be attached to the fixing member 10.
It is not necessary to provide special means for fixing the thermoplastic sheet 7 to the surface of the heat insulating layer 6. The same applies to the joints between each thermoplastic sheet 7 covering two adjacent side surfaces 4. Alternatively, as shown in FIG. 4, a joint 14C between the thermoplastic sheets 7 is provided at a location away from the ridgeline 9, and the fixing member 10 is applied on the thermoplastic sheet 7 at the ridgeline. The thermoplastic sheet 7 may be sandwiched between the fixing member 10 and the heat insulating layer 6, and the fixing member 10 may be fixed using the anchor bolts 11. In this case, a sealing material 18 is used to seal between the head of the anchor bolt 11, the end of the fixing member 10, and the thermoplastic sheet 7.

The upper edge of the thermoplastic sheet 7 covering the side surface 4 is sandwiched between a fixing member 10 similar to the fixing member 10 and a heat insulating material 116 and fixed with anchor bolts 11, as shown in FIG. A coating agent such as epoxy resin is then applied to the top surface 3 to form a coating film 118, and this coating agent is applied continuously from the top surface 3 to the upper end of the thermoplastic sheet 7 via the surface of the fixing member 10. to form a coating layer portion 8a that connects the coating layer 8 to the upper end of the thermoplastic sheet 7 in a watertight manner.

Since the upper end of the thermoplastic sheet 7 is fixed by a fixing member 10 and an anchor bolt 11, the thermoplastic sheet 7
There is no fear that the coating layer 8 will peel off from the thermoplastic sheet 7 or crack due to the difference in expansion coefficient between the thermoplastic sheet 7 and the coating layer 8.

In this way, the inner surface of the heat storage tank is covered with a continuous and completely watertight waterproof layer over the entire surface, consisting of the thermoplastic sheet 7 in the lower part from the water immersion line W and the coating layer 8 in the upper part.

As described above, according to the present invention, each part of the heat storage tank can be waterproofed most appropriately and economically according to the respective water pressure and temperature conditions, and the waterproof layer as a whole is highly durable and reliable. can be obtained at relatively low construction costs. Furthermore, each work, especially upward facing work, is less labor intensive, and since no adhesive is used to join the sheets, great effects can be obtained from the aspect of labor safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the inside of a heat storage tank waterproofed by the method of the present invention, Fig. 2 is a sectional view of the fixing member, Fig. 3 is an enlarged sectional view of part A in Fig. 1, and Fig. 4 is a cross-sectional view of the fixing member. The figure is a cross-sectional view showing a modification of the same portion, and FIG. 5 is an enlarged cross-sectional view of the portion B in FIG. 1. 1... Heat storage tank, 2... Cap body, 3... Top surface, 4...
・Side surface, 5...Bottom surface, 6...Insulating material layer, 7...Thermoplastic sheet, 8...Painting nM, 9...Ridge line, 10.
...Fixing member, 11...Anchor bolt, 12...
Base material, 13... Covering material, 14... Joint portion, 15...
- Band-shaped sheet, 16... Corner portion, 17... Molded sheet, 18... Sealing material.

Claims (2)

[Claims] (1) In a method of waterproofing the inner surface of a heat storage tank equipped with a heat insulating material layer, the sides and bottom of the inner surface of the heat storage tank below the water immersion line are covered with a plurality of thermoplastic sheets, and the heat The plastic sheets are watertightly joined to each other by heat fusion, a coating agent is applied to the top surface of the inner surface of the heat storage tank, and the layer of the coating agent is watertightly connected to the upper end of the thermoplastic sheet. A waterproof construction method for a heat storage tank characterized by the following. (2) A fixing member that can be heat-sealed to the thermoplastic sheet is attached along the ridgeline of the inner surface of the heat storage tank, and the thermoplastic sheet is heat-sealed and fixed to the fixing member. Waterproofing construction method.