JP2001340882A - Tank body of septic tank and septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the tank body of a septic tank capable of effectively preventing water leakage from a joint part. SOLUTION: The tank body of the septic tank (for example, an upper tank body 4) has a flange part 44 which is connected to another tank body (for example, a lower tank body 6) and formed so as to protrude toward the outside. The flange part 44 is made of a polynorbornene resin so that the thickness of the flange part 44 increases gradually from the main body of the tank body T1 to the tip end T2 of the flange part. This tank body of the septic tank can be preferably used as a domestic septic tank for treating the sewage of 5-10 persons, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank for a septic tank made of polynorbornene resin,
The present invention relates to a tank body of a purification tank such as an upper and lower tank body that can prevent water leakage from a joint portion when the tank body is joined to another tank body.

[0002]

2. Description of the Related Art Conventionally, most septic tanks have been molded using fiber reinforced plastic (FRP). Recently, however, polynorbornene-based polyolefins obtained by reaction injection molding (RIM) of metathesis polymerizable cyclic olefins have been used. Practical application of septic tanks made of resin is under way.

For example, Japanese Patent Application Laid-Open No. Hei 7-266434 discloses an upper tank section, a lower tank section, and, if necessary, an intermediate tank section for connecting these upper and lower tank sections. There is disclosed a large septic tank made of polynorbornene-based resin, which is joined, and in which the joints of the tank portions are fixed using a fastener and a polyurethane-based adhesive.

Japanese Patent Application Laid-Open No. 7-276519 discloses a large-sized septic tank made of a polynorbornene-based resin having a specific shape for a flange for joining each tank portion. Further, this publication describes that the flange length is 50 to 150 mm and the thickness of the flange is 4 to 20 mm as the shape of the flange portion.

The septic tanks made of polynorbornene resin disclosed in these publications are simple and lightweight to mold,
It has the advantage of being resistant to impacts and resistant to internal and external pressures.

Incidentally, this type of septic tank is generally assembled after the upper tank section and the lower tank section, and in some cases, the upper tank section, the intermediate tank section, and the lower tank section are separately formed. That is, through a flange having a uniform thickness (see, for example, FIG. 2 of Japanese Patent Application Laid-Open No. 7-276519) provided on each joint surface, using various adhesives, fasteners such as bolts and nuts, It is fixed and assembled.

[0007]

However, when the septic tank assembled in this manner is subjected to a water filling test,
There is a problem that water leaks from a gap between the joined flange surfaces.

[0008] An object of the present invention is to provide a tank body of a septic tank capable of effectively preventing water leakage from a joint portion, and a septic tank using the same.

[0009]

In order to achieve the above object, a tank body of a septic tank according to the present invention has a flange portion to be joined to another tank body, which is directed outward from the tank body body. It is formed so as to protrude, and the thickness of the flange portion is made to gradually increase from the tank body main portion toward the tip portion of the flange portion, characterized in that it is made of a polynorbornene resin. I do.

According to the tank body of the septic tank according to the present invention, the tank body can be firmly fixed to another tank body, and a gap generated between the tank body and the other tank body can be extremely reduced. as a result,
Water leakage from the joint can be effectively prevented.

In the present invention, the flange is preferably formed integrally with the tank body.

In the present invention, the thickness of the flange portion is
What is necessary is just to make "the thickness gradually increase from the tank body main body toward the tip end of the flange". In other words, with respect to the other tank body to be joined, by inclining only the joining surface side to be actually joined, the thickness of the flange portion may be gradually increased. By inclining only the non-joining surface side disposed on the opposite side, the thickness of the flange portion may be gradually increased, or by inclining both the joining surface and the non-joining surface, May be gradually increased.

The present invention can be applied to at least one of the upper tank constituting the upper tank of the septic tank and the lower tank constituting the lower tank, but is preferably applied to both the upper tank and the lower tank. I do. In addition, in addition to the upper tank body and the lower tank body, when there is an intermediate tank body that constitutes an intermediate tank unit that connects these upper and lower tank bodies, the upper tank body, the intermediate tank body, and the lower tank body. Although it can be applied to at least one, it is preferably applied to two or more of the upper tank, the intermediate tank and the lower tank, and more preferably the upper tank, the intermediate tank and the lower tank.

In the case where the present invention is applied to the upper tank, the "other tank" is a lower tank or an intermediate tank.
The “other tank” when applied to the lower tank is an upper tank or an intermediate tank, and the “other tank” when applied to the intermediate tank is an upper tank and / or It is a lower tank body.

The tank body of the septic tank according to the present invention can be preferably used, for example, in a household septic tank having 5 to 10 persons to be treated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 is a schematic sectional view showing an upper and lower tank body as one embodiment of a tank body of a septic tank according to the present invention, FIG. 2 is an enlarged view of a portion II in FIG. 1, and FIG. 3 is an upper and lower tank body in FIGS. 1 shows an assembled state, and FIG.
It is an enlarged view corresponding to a part.

As shown in FIG. 1, a septic tank 2 according to the present embodiment is used for purifying domestic wastewater discharged from ordinary households, such as flush water from flush toilets, wastewater from kitchen, and bathwater. The treatment septic tank, wherein the upper tank body 4
And a lower tank body 6. After assembling components (not shown) such as a partition plate and a filter bed inside, the upper and lower tank bodies 4 and 6 are assembled by overlapping. The upper tank body 4 is formed with three manhole cover mounting portions 46 necessary for maintenance of the septic tank along the longitudinal direction of the tank body. A manhole cover (not shown) is attached to each manhole cover attaching portion 46.

In this embodiment, the tank body portions 42 and 62 constituting the upper and lower tank members 4 and 6 respectively have flange portions 4 and 6.
4, 64 are formed, and these joining surfaces 444, 64 are formed.
The septic tank 2 is assembled by joining the four.
The flange portions 44 and 64 are respectively connected to the tank body main portions 42 and 64.
It is formed integrally with the tank body 62 from the tank body portions 42, 62 toward the outside (= direction of arrow X). Holes 442 and 642 are formed in the flange portions 44 and 64, respectively, to allow the fastening members 8 such as bolts (see FIG. 3) to be inserted therein, and the fastening members 8 (see FIG. 3) are inserted through the holes. By fixing them, the flange portions 44 and 64 of the upper and lower tank bodies 4 and 6 can be firmly fixed to each other.

As shown in FIG. 2, in this embodiment,
The thickness of both flange portions 44 and 64 of the upper and lower tank bodies 4 and 6 may be adjusted from the side of the tank body main portions 42 and 62 to the flange portions 44 and 6.
4 is adjusted so as to gradually increase in thickness toward the tip (= direction of arrow X). However, in the present invention, the upper and lower tank bodies 4,
It is sufficient that the thickness of at least one of the flanges 6 is adjusted to a predetermined range.

In this embodiment, the thickness of each of the flange portions 44 and 64 is gradually increased by inclining only the joining surfaces 444 and 644 to be actually joined. 444,644
The non-joining surfaces 446 and 646 arranged on the opposite side are flat. However, in the present invention, the non-joining surface 44
The thickness of the flange portions 44 and 64 may be gradually increased by inclining only the 6,646 side or inclining both the joint surfaces 444 and 644 and the non-joint surfaces 446 and 646.

In this embodiment, the flange portion 44 of the upper tank body 4 has a thickness T1 on the tank body main body 42 side of preferably 3 to 3.
It is 20 mm, more preferably 4 to 15 mm, and the thickness T2 on the tip side is preferably 4 to 25 mm, more preferably 5 to 20 mm. In order to make the effect of the present invention more remarkable, (T2−T1) is preferably set to 0.5 to 5 mm, more preferably 1 to 3 mm. However, the preferable range (T2-T1) is considered to also depend on the length L1, so that the flange portion 44 in this case is used.
Is preferably 30 to 150 mm.

In the present embodiment, the thickness T3 of the flange portion 64 of the lower tank body 6 on the tank body main body 62 side is preferably 3 to 3.
It is 20 mm, more preferably 4 to 15 mm, and the thickness T4 on the tip side is preferably 4 to 25 mm, more preferably 5 to 20 mm. Further, in order to make the effect of the present invention more remarkable, (T4−T3) is preferably set to 0.5 to 5 mm, more preferably 1 to 3 mm. However, since the preferable range (T4−T3) is considered to depend on the length L2, the flange portion 64 in this case is considered.
Is preferably 30 to 150 mm.

As shown in FIG. 3, the flange portions 44 and 64, which are the connection portions of the upper and lower tank bodies 4 and 6, are usually fastened and fixed by fasteners 8 such as bolts and nuts.
At that time, preferably, the flange joining surfaces 444, 644
For example, an adhesive such as a polyurethane-based, epoxy-based, or polyacrylate-based adhesive is applied, and then tightened and fixed.
At the time of fastening, a packing (not shown) made of, for example, butyl rubber, acrylonitrile-butadiene rubber, urethane elastomer, silicone rubber or the like may be interposed.

In the present embodiment, the upper and lower tank bodies 4, 6 as described above are made of a polynorbornene resin. The polynorbornene-based resin can be obtained by reaction injection molding (RIM) of a reaction stock solution usually containing a metathesis catalyst and an activator in addition to the norbornene-based monomer. In particular, it is preferable to be formed of a ring-opened polymer of a norbornene-based monomer modified with an elastomer.

As the norbornene-based monomer, cycloolefins having a norbornene ring such as dicyclopentadiene, dihydrodicyclopentadiene, tetracyclododecene, and tricyclopentadiene are preferred.

The metathesis catalyst may be any known metathesis catalyst known as a catalyst for bulk polymerization of norbornene-based monomers such as organic ammonium molybdates such as tungsten hexachloride, tridodecyl ammonium molybdate and tri (tridecyl) ammonium molybdate. Although there is no particular limitation, ammonium organic molybdate is particularly preferred. In addition, as a metathesis catalyst, a known ruthenium carbene complex (WO97 / 06185, Japanese Patent Application Laid-Open No.
0-508891 and JP-A-11-329553) can also be applied.

Examples of the activator (cocatalyst) include alkyl aluminum halides such as ethyl aluminum dichloride and diethyl aluminum chloride, alkoxyalkyl aluminum halides thereof, and organotin compounds. When a ruthenium carbene complex is used as a metathesis catalyst, an activator may or may not be used.

Examples of the elastomer include polybutadiene, styrene-butadiene copolymer (SBR), and styrene-butadiene-styrene block copolymer (SB).
S), polyisoprene, styrene-isoprene-styrene block copolymer (SIS), ethylene-propylene-diene terpolymer (EPT) and the like. The mixing ratio of the elastomer is 1 to 20 parts by weight, preferably 2 to 15 parts by weight, based on 100 parts by weight of the norbornene-based monomer. If the proportion of the elastomer is small, the flexibility is reduced. Conversely, if the proportion of the elastomer is too large, the glass transition temperature decreases and the strength decreases, which is not preferable.

In the present invention, the above-mentioned norbornene-based monomer is used by dividing into two or more reaction stock solutions. Specifically, at least two reaction stock solutions are prepared: a stock solution of a norbornene-based monomer containing a metathesis catalyst (solution B) and a stock solution of a norbornene-based monomer containing an activator (solution A). It is preferable that each of the liquid A and the liquid B is placed in a separate tank. Each of the reaction stock solutions alone does not cause polymerization of the norbornene-based monomer, but when each of the reaction stock solutions is mixed, bulk polymerization occurs. The sum of the components contained in each reaction stock solution corresponds to the amount of the components required for the bulk polymerization of the present invention. When performing bulk polymerization, two or more reaction stock solutions are instantaneously mixed using a mixing head or the like, and the mixed solution is immediately injected into a mold cavity to start polymerization. And
Bulk polymerization in the cavity of mold equipment (reaction injection molding)
Is completed, and the mold is opened at the stage when the molded body is solidified, whereby the molded body (upper and lower tank bodies 4, 6) is obtained. The material and size of the mold to be used, the polymerization time during molding, the mold temperature, and other conditions may be the same as those of ordinary molding by bulk polymerization of polynorbornene-based resin.

Specifically, dicyclopentadiene (DC
P) 85% by weight of tricyclopentadiene trimer 15
% By weight, and a styrene-isoprene-styrene block copolymer (Clayton 1170, manufactured by Shell)
Was dissolved in 5% by weight and 2% by weight of Irganox 1010 (manufactured by Ciba Specialty Chemicals), which is a phenolic antioxidant, was placed in two containers, and one of them was added with diethyl aluminum chloride (DEAC) based on the monomer. ) Is added to a concentration of 40 mmol, n-propanol to a concentration of 44 mmol, and silicon tetrachloride to a concentration of 20 mmol (solution A). On the other hand, tri (tridecyl) ammonium molybdate is added to the monomer in an amount of 10%.
It is added so as to have a millimolar concentration (solution B). The solution A and the solution B thus prepared are respectively sent to a mixing head by a gear pump so as to have a volume ratio of 1: 1 and subjected to collision mixing. Next, it is injected into the mold at a mold temperature of 70 ° C. and an injection pressure of 0.2 MPa or less.
In the mold, the reaction is performed for 2 to 4 minutes, and a series of these operations are performed under a nitrogen atmosphere. Thereafter, the lower tank 6 can be obtained by removing the molded product from the mold. The upper tank body 4 can be formed in the same manner.

In the present embodiment, the thickness of both flange portions 44 and 64 of the upper and lower tank bodies 4 and 6 are set to be equal to each other.
The thickness is adjusted so that the thickness gradually increases from the 62 side toward the tip portions of the flange portions 44 and 64. Therefore, as shown in FIG. 3, when the two flange portions 44 and 64 are fixed using the fastening member 8, the flange portions 44 and 64 can be more firmly tightened, and the two flanges 44 and 6 can be further tightened.
4 can be further reduced. As a result, water leakage from the inside can be more effectively prevented.

Further, according to the present embodiment, the upper and lower tank bodies 4,
6 is made of a polynorbornene-based resin obtained by a reaction injection molding method.
4 can easily form a tank body of a relatively large septic tank integrally formed with the tank body main portions 42 and 62, and is lightweight and excellent in impact resistance.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and may be implemented in various modes without departing from the gist of the present invention. Of course.

For example, in the above-described embodiment, the septic tank 2 composed of the upper tank 4 and the lower tank 6 has been described as an example, but the septic tank 2 is formed of the upper tank 4 and the lower tank 6. In addition, an intermediate tank body that connects the upper and lower tank bodies 4 and 6 may be further provided. In the intermediate tank in this case, it is preferable that the flange to be joined to at least one of the upper and lower tanks 4, 6 is a specific flange of the present invention.

[0035]

As described above, according to the present invention, it is possible to provide a septic tank body and a septic tank using the same that can effectively prevent water leakage from the joint.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an upper and lower tank as an embodiment of a tank of a septic tank according to the present invention.

FIG. 2 is an enlarged view of a portion II in FIG.

FIG. 3 shows an assembled state of the upper and lower tank bodies of FIGS. 1 and 2, and is an enlarged view corresponding to a portion II in FIG.

[Description of Signs] 2 ... Septic tank 4 ... Upper tank body (tank body of septic tank or other tank body) 42 ... Tank body main body 44 ... Flange section 442 ... Hole 444 ... Joining surface 446 ... Non-joining surface 46 ... Manhole Lid attachment part 6 ... Lower tank body (other tank body or tank body of septic tank) 62 ... Tank body main part 64 ... Flange part 642 ... Hole 644 ... Joining surface 646 ... Non-joining surface 8 ... Fastening member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08L 45:00 C08L 45:00 65:00 65:00 F term (Reference) 4D027 AA01 AA12 AB01 AB12 4F071 AA12 AA13 AA21 AA39 AH19 BA02 BB01 BB12 BC04 4J011 AA05 BB01 DA02 FA06 FB20 GA05 GB07 PA54 PA65 PA76 PA78 PA79 PB40 PC02 PC08 PC15

Claims (2)

[Claims] A flange portion to be joined to another tank body is formed so as to protrude outward from the tank body body portion, and the thickness of the flange portion is set to the tank body body portion. A tank body of a septic tank made of a polynorbornene-based resin whose thickness gradually increases toward the tip of the flange. 2. A flange part to be joined to another tank body is formed so as to protrude outward from the tank body main part, and the thickness of the flange part is set to the tank body main part. A purification tank having a tank body made of a polynorbornene-based resin whose thickness gradually increases toward the tip of the flange portion.