JPH0597181A - Method for preventing corrosion of bolt in prefabricated water tank - Google Patents

Abstract

PURPOSE:To prevent the bolt and nut screwed thereonto to fasten unit panels together from being corroded by the chlorine gas and vapor produced from water in the newly-installed or existing prefabricated water tank. CONSTITUTION:In a bolt 1 and a nut 2 screwed thereonto to fasten unit panels (a) and (b) together, the head of the bolt 1 and its exposed threaded part on the nut side are coated with a viscous resin-made putty 5, the putty coat is covered with resin-made caps 3 and 4 and the putty 5 is filled between the bolt 1 and each of the caps 3 and 4. The caps 3 and 4 are held against the upper parts of the panels (a) and (b) by an engaging instrument 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing corrosion of bolts in an assembled water tank. The present invention relates to a method of preventing corrosion of a bolt, which is a water tank which has been used for a considerable period of time and which can prevent the corrosion of the bolt from progressing further even if the corrosion has progressed considerably.

[0002]

2. Description of the Related Art In a building with three or more floors, it is necessary to install a water tank to supply water to each floor. The reason is that in such a building, it is stipulated that water must be stored in a tank and then supplied. Some aquariums were made in one piece so that they could not be disassembled, but this is not easy to install at the site, so make a unit panel and carry it to the site.
In many cases, panels were combined to form an aquarium on site. This is a prefabricated water tank.

Unit panels were initially made of metal. However, the metal panel is easily rusted and therefore corroded as a water tank. Therefore, a metal panel was coated with a synthetic resin and used as a resin-coated panel. However, the resin-coated panel has a drawback that it is inconvenient to handle because the weight is large because the inside is made of metal. Therefore, it has been decided that the entire panel should be made of resin, and among the resins, polyester resin has been favorably used and has been widely used. In this way, the polyester resin panel reinforced with glass fiber is
It is called a RP panel and has become widely used.

The panel made of FRP was made into a water tank by connecting the panel with bolts and nuts. The bolts and nuts in this case were made of metal, especially iron. Since iron nuts easily rust, it was attempted to coat the surface of the nuts with a synthetic resin, but the bolts and nuts coated with the resin had a difficulty in tightening. In other words, when tightened strongly with a monkey or a wrench, the coating resin is deformed, so that it cannot be tightened strongly, and thus it is difficult to join the panels together in an airtight manner. Therefore, iron bolts and nuts had to be used. Attempts were made to apply nickel plating to the bolts and nuts to prevent them from rusting, but the plating was also damaged when tightened with a monkey or a wrench, and the effect of preventing arrow corrosion was not fully achieved.

To maximize the use of building floor space, aquariums were often installed on the rooftops of buildings. The aquarium on the roof was exposed to wind and rain and was exposed to direct sunlight, so it was put under severe conditions. In particular, the inner surface of the lid is exposed to chlorine gas and water vapor generated from water, and the outer surface is exposed to direct sunlight, so the connecting bolts and nuts attached thereto are particularly corroded. It was As a result, the head of the bolt and the nut are corroded from the surface and the shape is changed to a shape like the head of a rivet,
It became a structure that neither spanner nor monkey was required.
In such a state, the rusty iron pieces fall into the water from the corroded surface, which also pollutes the water.

[0006]

The problem that the bolts and nuts corrode and pollute the water cannot be left as it is. However, since the head of the bolt and the nut cannot be locked with a spanner or the like, it is not easy to disassemble the original panel and replace the bolt and the nut.
Forcibly removing the bolts will damage the panel. Therefore, even though the panel itself could still be used, the water tank had to be discarded and a new water tank installed. This is extremely uneconomical. Therefore,
In such a case, there has been a demand for the appearance of a method of making the aquarium usable by modifying the bolt and the nut. The present invention was made in response to such a demand.

[0007]

SUMMARY OF THE INVENTION The present invention intends to prevent the erosion of the bolt and the nut by touching the head of the bolt and the nut in the above-mentioned case. The means used at that time is to cover the bolt head and nut with synthetic resin caps respectively to prevent erosion of the bolts and nuts, and to fix the caps with locking tools so that they do not fall. Is. Further, the means is to stop the erosion of the bolt and the nut,
The main idea is to apply a viscous resin putty on the surface of the bolt and nut and fill the space between the bolt or nut and the cap to prevent further erosion. Is.

The present invention can be applied not only to a water tank which has been used up but also to a water tank which is about to be newly attached.

[0009]

SUMMARY OF THE INVENTION The present invention provides an assembly type water tank in which unit panels are connected by metal bolts, and a resin cap for covering the legs of bolts or the heads of the bolts with nuts is prepared. Providing locking projections or depressions and notches or small holes in part of the cap, apply viscous resin putty around the head and feet of the bolt, or fill the cap with the putty. , Put the cap on the head and foot of the bolt, and confirm that the putty is filled between the bolt and the cap through the notch or small hole, and then insert one end of the locking tool into the protrusion or the recess of the cap. Fit and lock the locking tool on the cap, and lock the other end of the locking tool to the protrusion or recess of another cap located at the other end of the same bolt, or lock the other end to the panel. To let The symptom, it is an gist corrosion prevention method of the bolts in the prefabricated tank.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the method of the present invention will be described with reference to the drawings as follows. FIG. 1 is a partially cutaway sectional view of a lid of a prefabricated water tank showing an example of an implementation process of the method of the present invention. FIG. 2 is a partially cutaway sectional view of a lid of a prefabricated water tank showing another example of the process of carrying out the method of the present invention.

In FIGS. 1 and 2, a and b are
It is a unit panel that constitutes the lid of the aquarium. here,
The bolts 1 and the nut 2 connect the panels a and b. 3 and 4 are resin caps, which have the same shape. A resin putty 5 is filled between the bolt 1 and the cap 3. 6 and 7 are locking tools.

The resin putty 5 is preferably a viscous silicone resin, but may be a resin adhesive.
As the adhesive, it is preferable to use an epoxy resin that is curable in water, which is called “underwater bond”. The resin putty 5 may also be a curable polyester resin. Further, it is preferable that the resin putty does not significantly shrink in volume after application. For this purpose, a polyvinyl acetate resin adhesive containing a large amount of filler, for example, an inorganic filler such as calcium carbonate may be used.

The caps 3 and 4 shown in FIG. 1 are made of synthetic resin and have the same shape and size. Hard vinyl chloride resin, polyolefin, polyester resin and the like are suitable as the synthetic resin. As shown in the cap 3, these caps have a small hole 31 at the tip of the top. The small hole 31 also serves as a recess provided on the outer surface of the cap.

In FIG. 1, in the unit panel b,
It is shown that the resin panel 5 may be applied around the feet of the bolt 1 and the nut 2, the putty 5 may be thickly raised and adhered, and the cap 4 may be put on the putty 5. At this time, since the putty 5 is viscous, the space between the bolt 1 and the nut 2 and the cap 4 is filled up, and the excess putty 5 leaks out from the small hole 41 formed at the top of the cap 4. Become. This makes it possible to confirm that the putty 5 is filled in the cap 4 without any gap.

In the present invention, a locking tool is used to prevent the cap from falling off. The locking tool can be made of a hard resin having elasticity, for example, polyethylene resin, polypropylene resin, polyester resin, polyamide resin, hard vinyl chloride resin, vinylidene chloride resin, or the like.
The locking tool is formed in a U shape as a whole, and plays a role of pressing the cap by the elasticity of the opening portion of the U shape of the U shape. A locking projection is provided on the inner side of the opening, and the projection is locked to the cap.

The engaging member 6 of FIG. 1 is provided with protrusions 61 and 62 in the inner ring of the opening. These protrusions are small holes 31 on the cap 3 that are covered on both ends of the bolt 1.
And the small hole 41 on the cap 4 is just fitted. Therefore, insert the locking tool 6 between the two panels, and position it so that the connecting portion between the panel a and the panel b is inserted in the opening of the locking tool 6, and the space between the protrusions 61 and 62 is difficult. The projection 61 is fitted into the small hole 31 of the cap 3, and the projection 62 is likewise fitted into the small hole 41 of the cap 4. Then, the two caps are pressed by the elastic force of the locking tool 6 and held on the panel. Thus, the method of the present invention covers the head and foot of the bolt 1 with the caps 3 and 4.

The embodiment shown in FIG. 2 is greatly different from that of FIG. 1 in three points. First, the cap does not have a depression, but instead has a protrusion.
Second, the cap has notches instead of small holes. Third, the fasteners are not spanned between the caps, but instead are spanned between the cap and the panel. This point will be described below.

In FIG. 2, the caps 3 and 4 have slopes 32 and 4 having a small inclination on the way from the top to the base.
2 and. Therefore, the top of the cap forms a protrusion. Therefore, an annular portion 71 that surrounds the top of the cap 4 is installed on the crocodile 7 so that the cap is engaged with the cleats, so that there is no recess on the cap, It means that a protrusion is provided on the.

In FIG. 2, there is nothing to see as a small hole on the outer surface of the cap, but instead a notch 31 at the base of the cap.
Or 41 is provided. When the resin putty is filled in the cap and the cap is put on the head or foot of the bolt 1, the excessive putty protrudes from the notch 31 or 41.
It can be confirmed that the putty is filled between the bolt and the cap. The putty that has been eaten out is wiped off. The notches 31 and 41 are preferably located on the top of the cap. This will prevent the natural flow of putty.

In FIG. 2, the locking member 7 is, as described above,
The annular portion 71 locks the cap and the other end locks to the panel. More specifically, the locking tool 7 is provided with an intermediate piece 74 in the opening of the U-shaped body and has a Y-shape, and between the end piece 72 and the intermediate piece 74, the panels a and b are provided. The connection part is sandwiched. The end piece 72 and the intermediate piece 74 are provided with a locking projection 75 on the inner ring of the opening. This protrusion is
The panel is inserted into the recess formed in the crocodile to lock the locking tool 7 on the panel.

The method of the present invention can be carried out in various modes other than the examples shown in FIGS. 1 and 2. Also,
In FIGS. 1 and 2, the bolts and nuts retain their complete shape, and the case where they seem to be new water tanks has been described as an example, but the method of the present invention shows that the water tanks have already been used up. However, the present invention can also be carried out for a bolt that is eroded to form a rivet. That is, even if the bolt head or nut is eroded and the bolt or nut cannot rotate with the spanner, as long as the bolt connects the panel members to each other to some extent, the method of the present invention is carried out, It is possible to prevent the erosion from progressing above.

In order to carry out the method of the present invention on a used water tank, the heads or nuts of the bolts are first washed to remove rust. At this time, check if the bolt still retains the force to connect the panel. If it is confirmed to hold, the method of the present invention is applied. At that time, if necessary, a rust preventive paint is applied to the heads or nuts of the bolts, and then the method of the present invention is applied. Its application is
It is exactly the same as the case of the above-mentioned new construction.

[0023]

According to the method of the present invention, the head and foot of the metal bolt connecting the unit panels are covered with the resin cap that covers the head and foot. It is possible to prevent chlorine gas from directly contacting the bolts and nuts, and thus to prevent the progress of erosion between the bolts and nuts. Also, in that case,
Since the resin putty is filled between the cap and the bolt or nut, the putty is also prevented from contacting the bolt or nut with steam and chlorine gas, and therefore the erosion of the bolt and nut is further ensured. Can be prevented. At that time, since the cap has a small hole or notch, it is possible to confirm that the viscous resin putty is about to ooze out from the small hole or notch when the cap is covered, and therefore, the filling of the putty is completed. Can be ensured. Further, since the cap has a projection or a recess, one end of the locking tool is fitted into the projection or the recess, and the cap is locked by the locking tool, and the other end of the locking tool is the other end of the same bolt. Since the other end of the locking tool is locked to the protrusion or the recess of the other cap located at, or the other end of the locking tool is locked to the panel, the locking tool can surely prevent the cap from falling off. Since the heads and feet of the bolts are covered with the caps in this way, the bolts and nuts can be prevented from being eroded, and the method of the present invention is extremely effective in extending the life of the water tank.

[0024]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a cover of a prefabricated water tank showing an implementation process of the method of the present invention.

FIG. 2 is a partial cross-sectional view of a cover of a prefabricated water tank showing an implementation process of the method of the present invention.

[Explanation of symbols]

 a and b are unit panels 1 bolts 2 nuts 3 and 4 are resin caps 5 viscous resin putties 6 and 7 are fasteners

Claims (1)

[Claims] 1. An assembly type water tank in which unit panels are connected by metal bolts, and a resin cap for covering the foot of the bolt in which the nut is fitted or the head of the bolt is prepared.
Providing a locking projection or recess on the outer surface of the cap and providing a notch or small hole in a part of the cap, apply viscous resin putty around the head and foot of the bolt, or in the cap described above. Fill the putty, put the cap on the head and foot of the bolt, check that the putty is filled between the bolt and the cap through the notch or small hole, and then lock in the protrusion or recess of the cap One end of the tool is fitted to lock the locking tool on the cap, and the other end of the locking tool is locked to the protrusion or recess of another cap located at the other end of the same bolt, or the other end is locked. A method of preventing corrosion of a bolt in a prefabricated water tank, which is characterized in that it is locked to a panel.