JP3148793B2 - Large septic tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized septic tank which is lightweight, resistant to collisions and excellent in durability. The present invention also relates to a large-sized, integrally formed, non-polluting septic tank that does not require fiber reinforcement, is recyclable, and does not generate harmful gases during incineration.

[0002]

2. Description of the Related Art Conventionally, many septic tanks are molded using fiber reinforced plastic (FRP). In particular, it is molded using an unsaturated polyester resin reinforced with glass fibers. When a septic tank is formed using the unsaturated polyester resin reinforced with glass fiber, a large amount of dust containing glass fiber is generated, and there is a problem that the working environment is deteriorated. In addition, such a septic tank using FRP has a large weight, and has a drawback that when it is dropped during transportation or struck by pebbles during construction, a crack is easily generated by the impact. Further, since the FRP molded article contains glass fibers, it is difficult to crush and pulverize it at the time of disposal, and even if it is incinerated, a large amount of glass fibers remains, and it takes time to process it.

Some of the present inventors have proposed that as a solution to these problems, at least the upper tank and the lower tank are composed of a monomer solution A (solution) comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system. A) is mixed with a monomer solution B (solution B) comprising a metathesis polymerizable cyclic olefin containing an activator component of a metathesis polymerization catalyst system, and the raw material mixture is injected into a mold, and A crosslinked polymer molded product obtained by polymerization and crosslinking reaction was found to be useful as a large-sized septic tank, and a patent application was filed earlier (Japanese Patent Application No. 5-2850).
No. 97; filed on January 15, 1993).

[0004] However, although the large septic tank gives good results as a septic tank, the thickness of the flange portion is small due to the low elasticity of the molding material itself, and when the flange portion is fixed with bolts, the bolt-to-bolt gap is reduced. It was found that the amount of deformation at the center became large, and that water leakage resistance was not always sufficient.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work environment problem which is a disadvantage of fiber reinforced plastic (FRP).
At least the upper tank section and the lower tank section proposed as a solution such as being heavy in weight and having low impact strength include a monomer solution A (solution A) comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system. ) Is mixed with a monomer solution B (solution B) comprising a metathesis-polymerizable cyclic olefin containing an activator component of a metathesis polymerization catalyst system, and the raw material mixture is injected into a mold and polymerized in the mold. And a crosslinked polymer molded product obtained by a cross-linking reaction, between the upper tank flange / lower tank flange, between the upper tank flange / middle tank flange, or between the middle tank flange / lower tank flange. It is an object of the present invention to provide a large-sized septic tank which can be used for a long time without causing a liquid leak from the joint portion.

[0006]

Means for Solving the Problems The inventors of the present invention have intensively studied to solve the above-mentioned object of the present invention, and as a result, a grid for improving rigidity is provided on a flange portion connecting each tank portion of a large-sized septic tank. The present inventors have found that the provision of the ribs prevents the liquid from leaking from the joint portion.

That is, the present invention provides a large-sized septic tank comprising an upper tank section and a lower tank section, or comprising an upper tank section, a lower tank section, and an intermediate tank section of a plate-like band connecting them. The large septic tank comprises: (1) at least an upper tank portion and a lower tank portion each comprising a monomer liquid A (solution A) composed of a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system and an activity of the metathesis polymerization catalyst system; And a monomer solution B (solution B) comprising a metathesis polymerizable cyclic olefin containing an agent component, and the mixture is poured into a mold and polymerized and cross-linked in the mold. Crosslinked polymer molded article,
(2) The upper tank section and the lower tank section, or the upper tank section, the intermediate tank section, and the lower tank section have a structure in which the upper tank section and the lower tank section are joined via a flange provided at a joint section therebetween, and (3). It is a large-sized septic tank characterized in that each flange portion has a grid-like rib on a surface opposite to a joint surface thereof.

According to the present invention, the tank capacity is 2 m ³ or more, preferably ³ to 15 m ³ , particularly preferably 3 to 12 m 3.
A large septic tank of m ³ is provided.

Hereinafter, the present invention will be described more specifically. As the metathesis-polymerizable cyclic olefin for forming the crosslinked polymer constituting the septic tank of the present invention, those containing one to two metathesis-polymerizable cycloalkene groups in the molecule are used. Preferred are compounds having at least one norbornene skeleton in the molecule. Specific examples of these include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene co-dimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenylnorbornene, 1,4,5,8-dimetano. -1,4,4a, 5,6,
7,8,8a-octahydronaphthalene, 1,4-methano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4,5,8-dimethano- One,
4,4a, 5,6,7,8,8a-octahydronaphthalene,
6-ethylidene-1,4,5,8-dimetano-1,4,4a,
5,6,7,8,8a-Heptahydronaphthalene, 1,4,
5,8-Dimethano-1,4,4a, 5,6,7,8,8a-hexahydronaphthalene, ethylenebis (5-norbornene), and the like, and a mixture thereof can also be used. In particular, dicyclopentadiene or a mixture containing 50 mol% or more, preferably 70 mol% or more thereof is suitably used.

[0010] If necessary, a metathesis polymerizable cyclic olefin having a polar group containing a different element such as oxygen or nitrogen can be used as a copolymer monomer. Such a copolymer monomer also preferably has a norbornene structural unit, and as a polar group, an ester group,
Preferred are an ether group, a cyano group, an N-substituted imide group, a halogen group and the like. Specific examples of such a copolymerized monomer include 5-methoxycarbonylnorbornene, 5- (2-
Ethylhexyloxy) carbonyl-5-methylnorbornene, 5-phenyloxymethylnorbornene, 5-cyanonorbornene, 6-cyano-1,4,5,8-dimethano-1,4,4a, 5,6,7,8 , 8a-octahydronaphthalene, N-butylnadecimide, 5-chloronorbornene, and the like.

The monomer solution A (solution A) of the present invention contains a catalyst component of a metathesis polymerization catalyst system. As such a catalyst component, salts such as halides of metals such as tungsten, rhenium, tantalum and molybdenum are used, and a tungsten compound is particularly preferable. As such a tungsten compound, tungsten hexahalide, tungsten oxyhalide and the like are preferable, and more specifically, tungsten hexachloride, tungsten oxychloride and the like are preferable. Further, an organic ammonium tungstate or the like can be used. It has been found that such a tungsten compound immediately starts cationic polymerization when added directly to a monomer, which is not preferable. Therefore, it is preferable that the tungsten compound is used by suspending it in an inert solvent such as benzene, toluene, chlorobenzene or the like in advance and solubilizing by adding a small amount of an alcohol compound and / or a phenol compound. Further, as described above, it is preferable to add about 1 to 5 mol of a Lewis base or a chelating agent to 1 mol of the tungsten compound in order to prevent undesired polymerization. Examples of such additives include acetylacetone, alkyl acetoacetates, tetrahydrofuran, and benzonitrile. When a polar monomer is used, as described above, the polar monomer itself may be a Lewis base, and in some cases, the compound may have its action without adding any of the above compounds. As described above, the monomer liquid A containing the catalyst component (solution A) has substantially sufficient stability.

On the other hand, the monomer solution B (solution B) of the present invention contains an activator component of a metathesis polymerization catalyst system. The activator-forming component is preferably an organometallic compound mainly composed of an alkylated metal of Group I to Group III of the periodic table, particularly a tetraalkyltin, alkylaluminum compound or alkylaluminum halide compound. Examples thereof include diethyl aluminum, ethyl aluminum dichloride, trioctyl aluminum, dioctyl aluminum iodide, and tetrabutyl tin. By dissolving the organometallic compound as an activator component in the monomer, a monomer liquid B (solution B) is formed.

Basically, a desired molded article of the crosslinked polymer can be obtained by mixing the solution A and the solution B and injecting the mixture into a mold. Is initiated so quickly that curing can occur while not sufficiently flowing into the mold, often causing problems. Therefore, it is preferable to use an activity regulator. As such regulators, Lewis bases are generally used, among others, ethers, esters,
Nitriles and the like are used. Specific examples include ethyl benzoate, butyl ether, diglyme and the like. Such a regulator is generally used by being added to the solution (solution B) of the component of the activator of the organometallic compound. When a monomer having a Lewis base is used as described above, it can also serve as a regulator.

The amount of the metathesis polymerization catalyst system used is, for example, when a tungsten compound is used as a catalyst component, the ratio of the tungsten compound to the raw material monomer is as follows:
It is about 1,000 to 1 to 15,000 to 1, preferably about 2,000 to 1, on a molar basis, and when the activator component is an alkyl aluminum, an aluminum compound based on the raw material monomer is used. Is from about 100: 1 to 10,000: 1 on a molar basis, preferably 20: 1.
A neighborhood of 0: 1 to 500: 1 is used. Further, as described above, the masking agent and the adjusting agent can be appropriately adjusted and used according to the amount of the catalyst system to be used by experiments.

The molded article of the present invention can be basically obtained by mixing the above-mentioned solution A and solution B and injecting them into a mold. In this case, the catalytic activity of the metathesis catalyst system formed by mixing the solution A and the solution B can be represented by the time from when the two solutions are mixed to when the mixture loses fluidity. That is, if the time until the fluidity is lost is defined as the time from when both solutions are placed in a glass container equipped with a stirrer until the solution gels and entangles on the stirring shaft of the stirrer, the present invention is defined as follows. Solution A
And the time of losing the fluidity at 30 ° C.
It is desirable that the time be 120 seconds, preferably between 2 and 100 seconds.

The molded article of the crosslinked polymer obtained by the present invention may further contain various additives according to the purpose in order to improve or maintain its properties in practical use. Such additives include fillers, pigments, antioxidants, light stabilizers, flame retardants, polymer improvers, and the like. Such an additive cannot be added after the crosslinked polymer of the present invention has been formed, so that it is necessary to add the additive to the above-described raw material solution beforehand.

The easiest method is to use the solution A
And a method in which it is added in advance to one or both of solution B, but in this case, it does not react practically with a strongly reactive catalyst component or activator component in the solution. And must not inhibit polymerization. In the case where the polymerization does not substantially inhibit the polymerization even if the reaction is unavoidable, the third liquid can be prepared by mixing with the monomer and used immediately before the polymerization. Further, a third solution containing a polymerization catalyst or an activator, and a solution A or a solution B containing no third solution.
It is also conceivable to add the above additives to the mixture. Further, in the case of a solid filler, in the case where both components are mixed and the shape is such that the voids can be sufficiently filled immediately before the start of the polymerization reaction or during the polymerization, the filler is filled in the mold. It is also possible to keep. Reinforcing agents or fillers as additives are effective in improving flexural modulus. Such materials include glass fibers, mica, carbon black, wollastonite and the like. Those surface-treated with a so-called silane coupler or the like can be suitably used.

It is preferable that an antioxidant is added to the molded article according to the present invention. Therefore, it is desirable to add a phenol or amine antioxidant to the solution in advance. Specific examples of these antioxidants include 2,6-di-t-butyl-p-cresol, N, N ′
-Diphenyl-p-phenylenediamine, tetrakis [methylene (3,5-di-t-butyl-4-hydroxycinnamate)] methane and the like.

The molded article of the present invention can be obtained by adding another polymer in a monomer solution state at the time of molding. As such a polymer additive, the addition of an elastomer is effective in increasing the impact resistance of the molded product and adjusting the viscosity of the solution. Elastomers used for such purposes include styrene-butadiene-styrene triblock rubber, styrene-isoprene-styrene triblock rubber, polybutadiene, polyisoprene,
A wide range of elastomers can be mentioned, such as butyl rubber, ethylene propylene-diene terpolymer, and nitrile rubber.

Examples of the material of the mold for forming the septic tank of the present invention include steel, cast or forged aluminum or zinc alloy, and spraying, electroforming such as nickel and copper, and resin. In addition, the structure of the mold is simple enough because the pressure generated in the mold during molding is several kg / cm ² , which is extremely low as compared with other molding methods. Can be made.

One of the features of the cyclic olefin crosslinked polymer molded article of the present invention is that it has excellent impact resistance, and it is not easily broken even when dropped or when a solid such as pebbles collides. . Further, the molded article of the present invention basically does not need to particularly use a reinforcing material such as glass fiber. Therefore, the flexural modulus is generally lower than those using these reinforcing materials. The present inventors have already proposed as a means for solving this problem that a shape having a concave and convex rib having a specific structure is effective for a large-sized septic tank (Japanese Patent Application No. 5-285097; November 1993). On March 15). The large septic tank proposed above is a large septic tank composed of an upper tank section and a lower tank section or an upper tank section, a lower tank section, and an intermediate tank section of a plate-like band connecting them. The large septic tank is (1) a cross-linked polymer molded article of the cyclic olefin, and (2) at least the upper tank section and the lower tank section have rectangular uneven ribs in the vertical direction, and the uneven ribs are located laterally of the septic tank. The average width of the ribs in the direction is 1.5 to 5 per m, and (3) each of the concave and convex ribs has the following shape characteristics (i) to (iv) (i) 10 ≦ H ≦ 50 ( ii) 30 ≦ W ≦ 200 (iii) 2 ≦ R <H, 2 ≦ R ′ <H (iv) 3 ≦ t [where t is the average thickness of the molded product having a cross section perpendicular to the length direction of the uneven ribs] H indicates the height of the projection from the surface of the molded article, W indicates the width of the projection, and R and R 'indicate Each shows the radius of the bent portion of the uneven portion. The units of t, H, W, R and R 'are expressed in millimeters (mm). ] Is satisfied. The large septic tank of the present invention can have such a rib, and it is more preferable. When an intermediate tank is provided, the intermediate tank may have a similar rib.

Next, the structure of the large-sized septic tank of the present invention will be described with reference to the drawings. The large-sized septic tank of the present invention is basically composed of two or three members. That is, it is composed of two members, an upper tank part and a lower tank part, or is composed of three parts, an upper tank part, a lower tank part and an intermediate tank part of a plate-like band connecting them.

FIG. 1 shows an example of a large-sized septic tank according to the present invention, in which A is a front view and B is a side view. In FIG. 1, 1 is an upper tank and 2 is a lower tank.
In FIG. 1, the upper tank 1 and the lower tank 2 are fixed by flanges 3 and 3 '. Further, the upper tank section 1 and the lower tank section 2 may be fixed by an intermediate tank section of a plate-like band connecting them. This intermediate tank section is not shown in FIG.
The intermediate tank section is fixed firmly between the upper tank section and the lower tank section usually through a flange. By providing this intermediate tank portion, a purification tank having an increased internal volume can be obtained. In the large-sized septic tank of FIG. 1, ribs 4 and 4 ′ are provided in the upper tank section and the lower tank section, respectively, in the vertical direction (the number of ribs is 4 in the front view and 2 in the side view in FIG. 1). Book).

In the large-sized septic tank of the present invention, at least the upper tank section and the lower tank section are molded articles of the crosslinked polymer of the metathesis polymerizable cyclic olefin described above, preferably the upper tank section,
All of the lower tank section and the intermediate tank section are molded articles of this crosslinked polymer. Each of these upper tank part, lower tank part and intermediate tank part is also characterized in that it is an integrally molded product.

Once installed, the septic tank is used for a long period of time of 10 to 20 years or more. Since water enters the septic tank, water pressure is applied to the inside of the tank. Strictness is also required for durability and heat resistance, for example, pressure is always applied.

In order to meet such strict requirements, the large-sized septic tank of the present invention has a joint between an upper tank and a lower tank, or an upper tank, a lower tank, and an intermediate tank of a plate-like band connecting them. The above-mentioned required characteristics are overcome by fixing with a specific flange provided in the above.

That is, the molded article of the present invention does not contain a reinforcing material such as glass fiber, so that the material itself has low rigidity, but grid-like ribs are provided on the surface opposite to the bonding surface of the flange portion. Thus, the structure is resistant to water leakage due to internal pressure and external pressure.

The ribs may be provided in the vertical direction of the septic tank to supplement the rigidity of the material itself, and the ribs may be provided on the bottom to increase the rigidity of the bottom. These reinforcing structures are also characterized in that they can be obtained as an integrally molded product with the septic tank body.

[0029] The C in FIG. 2 cross-sectional view of the grid-shaped ribs provided on the opposite surface and the bonding surface of the flange portion is shown schematically. In FIG. 2C , reference numeral 5 denotes a flange portion, and reference numeral 6 denotes a joining surface at the flange portion. Lattice ribs 7 and 7 ′ are provided on the surface opposite to the joining surface 6. The height of the grid-like ribs 7, 7 'is denoted by h, and the width of the grid-shaped ribs is denoted by w. In FIG. 2C , the height h of the lattice rib is preferably in the range of 2 to 15 mm, and particularly preferably in the range of 5 to 12 mm. Height h
Is smaller than 2 mm, the improvement in rigidity of the structure is reduced. On the other hand, when it exceeds 15 mm, the lattice rib depth is too large, and handling during molding becomes troublesome. The grid-like ribs need not have the same rib height. Rib width w
Is preferably in the range of 2.5 to 5 mm, particularly preferably in the range of 3 to 4 mm. When the width w is smaller than 2.5 mm, it is not preferable in terms of long-term physical properties of the material. When the width w is larger than 5 mm, it does not contribute to weight reduction.

[0030] D of FIG. 2 is a portion of grid-like ribs 7, 7 to two pairs of隔接present on the surface opposite to the bonding surface of the flange portion 'is crossover that shown schematically. The repetition interval d (distance between the center lines of two adjacent and parallel lattice ribs) of the lattice rib is 10 to 150 mm, and the other interval d 'is within the range of 10 to 1000 mm, preferably 10 to 100 mm, respectively. １００100 mm. When the repetition interval is smaller than 10 mm, not only the handling at the time of molding becomes troublesome, but also the lightness characteristic of the structure without glass is impaired. If the interval is too long, the rigidity is not improved. The rib direction of the rib group having the interval d is desirably parallel to the longitudinal direction of the flange (the septic tank main body) or within a range intersecting the septic tank main body at an angle of 30 ° or less. This is because the closer the rib direction is to the parallel with the septic tank main body, the more effective the rigidity of the flange is. An example is shown in FIG. 3 (partial enlargement of the flange plan view). The angles r and r 'at which the lattice ribs intersect are in the range of 20 to 160 °, preferably 30 to 150 °. If the angle is smaller than 20 ° or larger than 160 °, one set of intersections will always be an extremely acute angle, and handling in forming will be troublesome. It is not necessary that all the cross angles have the same value, and they may be changed depending on the liquid flow during molding.

FIG. 3 is a partially enlarged view of the grid-like ribs present on the flange portion (the surface opposite to the joint surface) when viewed from the upper (or lower) side when a large-sized septic tank is assembled. FIG. 3 shows an example in which a set of grid-like ribs is provided substantially parallel to the longitudinal direction of the flange end 9.

The septic tank of the present invention is generally divided into two parts, an upper tank part and a lower tank part, and if necessary, if there is an intermediate tank part, they are formed separately. The molding method is already known,
For example, it is formed by a method disclosed in Japanese Patent Publication No. 3-28451. A flange portion serving as a seam is provided at the opening of the upper tank portion and the lower tank portion, and by joining the flange portions, a purification tank is obtained in which the upper tank portion and the lower tank portion are combined. In the present invention, the volume of the septic tank can be increased by inserting a band-shaped intermediate tank section having upper and lower flanges between the upper tank section and the lower tank section flange section. In addition to using an adhesive, the flange joint can sandwich a band-shaped packing material made of synthetic rubber.

The bolt or rivet position for joining the flange portion may be raised to the height of the lattice rib to increase the thickness. As a result, the mounting workability is improved, and the structure has a firm strength.

The thickness of the septic tank of the present invention is 3 mm or more in strength, preferably 4 mm or more, more preferably 4.5 m or more.
m or more. The thickness of the entire flange is preferably 0.8 to 5 times the average thickness of the septic tank.

Although the inside of the septic tank of the present invention is not shown, it has basically the same structure as that of a normal septic tank, and is divided according to each function such as an anaerobic tank, an aerobic tank, and a disinfecting tank. Is filled with various members for purifying waste water efficiently, and a flowing water channel is provided. The large septic tank of the present invention can be used as a single tank for only human waste treatment or as a combined septic tank for purifying both human waste and domestic wastewater.

[0036]

The present invention will be described below with reference to examples. It should be noted that the examples are for explanation, and the present invention is not limited to these.

[Mold] An aluminum mold incorporating the product shape shown in FIG. 1 was used. The dimensions of the septic tank produced in the example were as follows. C = 2326 mm D = 950 mm E = 800 mm F = 1140 mm A flange incorporating the product shape shown in FIG. 2 was used. (I) h = 10 mm (ii) d = 15 mm d '= 15 mm (iii) r = 45 ° (135 °)

[Monomer liquid] [Preparation of solution A] 20 parts by weight of tungsten hexachloride was added to 70 parts by weight of dry toluene under a nitrogen stream, and then a solution consisting of 2 parts by weight of nonylphenol and 16 parts by weight of toluene was added. A 0.5M tungsten-containing catalyst was prepared by purging the solution with nitrogen gas overnight to remove hydrogen chloride gas generated by the reaction of tungsten hexachloride with nonylphenol, and further adding 10 volumes of the solution. 1 part by volume of acetylacetone was added to each part to prepare a polymerization catalyst.

Next, a monomer mixture comprising 95 parts by weight of purified dicyclopentadiene (purity: 99.7% by weight, the same applies hereinafter) and 5 parts by weight of purified ethylidene norbornene (purity: 99.5% by weight, the same applies hereinafter) was mixed with ethylene containing 70
3% by weight of an ethylene-propylene-ethylidene norbornene polymerized rubber in mole%, and Ethanox 7 as an oxidation stabilizer
To the solution to which 022 parts by weight were added, the above-mentioned catalyst solution for polymerization was added so that the tungsten content was 0.01 / liter, to prepare a monomer solution A containing a catalyst component (solution A).

[Preparation of Solution B] A polymerization activator mixed solution prepared by mixing and preparing trioctylaluminum 85, dioctylaluminum iodide 15, and diglyme in a molar ratio of 100 was mixed with 95 parts by weight of purified dicyclopentadiene and 5 parts by weight of purified ethylidene norbornene. Part, ethylene content 70
A monomer mixture consisting of 3 parts by weight of an ethylene-propylene-ethylidene norbornene polymerized rubber in an amount of 0.03 mol / l was mixed with a monomer liquid B containing an activator component (solution B). Prepared. Solution B had a viscosity of 300 cps at 30 ° C.

[Molding] An aluminum mold for molding was heated to a cavity mold of 90 ° C. and a core mold of 60 ° C., and the mold was closed.
Using a RIM molding machine, equal amounts of the solution A and the solution B were collision-mixed and injected into the mixing head. The mold was opened 2 minutes after the liquid injection and filling, and the crosslinked polymer product was taken out 3.5 minutes later.

[Evaluation as a purification tank] The upper and lower tanks of the obtained crosslinked polymer molded product were fixed with bolts and an adhesive via a flange portion to obtain a product for evaluation. In addition, the product is FR
It is fixed with the same bolt and adhesive using three P-partition plates. The product satisfied both the rigidity test and the durability test based on JIS A4101.

[Brief description of the drawings]

FIG. 1 shows an example of a large-sized septic tank according to the present invention, wherein A is a front view and B is a side view.

[Figure 2] shows an example of the grid-shaped ribs provided on the opposite side of the joint surface of the flange portion of a large septic tank according to the present invention, C is cross-sectional view, D is a grid-like ribs which two sets of隔接The figure which showed the intersection part typically was shown.

FIG. 3 is an enlarged view of a part of the large-sized septic tank according to the present invention in which lattice-shaped ribs of a flange portion are present.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Septic tank upper tank part 2 Septic tank lower tank part 3, 3 'flange 4, 4' rib 5 Flange part 6 Joining surface in a flange part 7, 7 'Grid-shaped rib 8 Purification tank main body part 9 Flange end part 10 Bolt

Continuation of the front page (56) References JP-A-3-223310 (JP, A) JP-A-3-164216 (JP, A) JP-A-3-115322 (JP, A) JP-A-2-239915 (JP) JP-A-63-241008 (JP, A) JP-A-63-222824 (JP, A) JP-A-7-290484 (JP, A) JP-A-7-137070 (JP, A) 3-54798 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 C02F 3/02

Claims (2)

(57) [Claims] 1. A large-sized septic tank comprising an upper tank section and a lower tank section or an upper tank section, a lower tank section, and an intermediate tank section of a plate-like band connecting them. (1) At least the upper tank part and the lower tank part contain a monomer liquid A (solution A) comprising a metathesis polymerizable cyclic olefin containing a metathesis polymerization catalyst system catalyst component and a metathesis polymerization catalyst system activator component. Monomer liquid B comprising a metathesis polymerizable cyclic olefin (solution B)
And a mixture of the raw materials is poured into a mold and polymerized and cross-linked in the mold to obtain a crosslinked polymer molded article, wherein (2) an upper tank section and a lower tank section Alternatively, the upper tank section, the intermediate tank section, and the lower tank section have a structure in which the upper tank section, the lower tank section, and the lower tank section are joined via a flange provided at a joint section with each other. A large-sized septic tank having a grid-like rib on the opposite surface. 2. The lattice-shaped rib has the following shape characteristics (i):
The large-sized septic tank according to claim 1, which satisfies (iv). (I) 2 ≦ h ≦ 15 (ii) 2.5 ≦ w ≦ 5 (iii) 10 ≦ d ≦ 150, 10 ≦ d ′ ≦ 1000 (iv) 20 ° ≦ r ≦ 160 ° [where h is a lattice Indicates the rib height of the rib in millimeters,
w is the average rib thickness in millimeters, d is the distance between one set of ribs in the grid-like ribs in millimeters, d 'is the other distance between the ribs in millimeters, and r is the grid 3 shows the angles of the cross ribs forming the shape. ]