JPH07329096A - Large-scale purification cistern - Google Patents

Abstract

PURPOSE:To make the title tank easy in molding, light in weight and strong against a shock and endure sufficiently inner and outer pressure, by a method wherein in a flange part, a latticelike rib is provided on the face opposite to its joint. CONSTITUTION:A monomer solution comprising a metathesis polymerizable cyclic olefin containing a metathesis polymer catalyst series catalyst component and a monomer solution comprised of the metathesis polymerizable cyclic olefin containing metathesis polymer catalyst series activation agent component are mixed up with each other, the raw material mixed solution is cast into a mold, polymerizing and crosslinking reactions are made to perform within the mold, through which at least, an upper tank part and lower tank part are formed. The upper and lower tank parts are fixed through a flange part 5. Latticelike ribs 7, 7' to improve rigidity are formed on the flange part 5.

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 collision and excellent in durability. The present invention also relates to a pollution-free, integrally-molded large-sized septic tank that does not require fiber reinforcement, can be recycled, and does not generate harmful gas during waste incineration.

[0002]

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

As a solution to these problems, some of the inventors of the present invention at least in the upper tank portion and the lower tank portion include a monomer liquid A (solution) composed of a metathesis-polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system. A) and a monomer liquid B (solution B) composed of a metathesis-polymerizable cyclic olefin containing an activator component of a metathesis polymerization catalyst system are mixed, and the raw material mixed liquid is injected into the mold, It was found that the crosslinked polymer molded product obtained by the polymerization and the crosslinking reaction is useful as a large-scale septic tank, and the patent application was previously filed (Japanese Patent Application No. 5-2850).
No. 97 specification; filed on January 15, 1993).

However, although the large septic tank gives good results as a septic tank, since the molding material itself has a low elastic modulus, when the flange portion is thin and the flange portion is fixed with bolts, etc. It was found that the amount of deformation in the central part became large and the water leakage resistance was not always sufficient.

[0005]

The object of the present invention is to solve the problem of working environment which is a drawback of fiber reinforced plastics (FRP).
At least the upper tank portion and the lower tank portion, which have been proposed as a solution to the problem of being heavy in weight and having low impact strength, at least the upper tank portion and the lower tank portion are composed of a monomer liquid A (solution A containing a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system). ) And a monomer liquid B (solution B) composed of a metathesis-polymerizable cyclic olefin containing an activator component of a metathesis polymerization catalyst system, and the raw material mixed liquid is injected into the mold to polymerize in the mold. And a cross-linked polymer molded product obtained by causing a cross-linking reaction, between the upper tank part flange / lower tank part flange, the upper tank part flange / middle tank part flange, or the middle tank part flange / lower tank part flange. It is intended to provide a large-scale septic tank which can be used for a long period of time without liquid leakage from the joint part of.

[0006]

DISCLOSURE OF THE INVENTION As a result of intensive studies conducted by the present inventors in order to solve the above-mentioned object of the present invention, a grid for improving rigidity in a flange portion connecting each tank portion of a large-scale septic tank. The present invention has been completed by finding that the liquid leakage from the joint portion does not occur by providing the ribs.

That is, the present invention is a large-scale septic tank composed of an upper tank part and a lower tank part, or an upper tank part, a lower tank part and an intermediate tank part of a plate-shaped belt connecting them. The large-scale septic tank has (1) at least an upper tank portion and a lower tank portion, a monomer liquid A (solution A) made 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. It is obtained by mixing a monomer liquid B (solution B) composed of a metathesis-polymerizable cyclic olefin containing an agent component, injecting the raw material mixed liquid into a mold, and causing polymerization and crosslinking reaction in the mold. Is a cross-linked polymer molded article,
(2) The upper tank part and the lower tank part, or the upper tank part, the intermediate tank part, and the lower tank part have a structure in which they are joined via a flange provided in a portion to be joined to each other, and (3) The large septic tank is characterized in that each of the flange portions has a grid-like rib on the surface opposite to the joining surface.

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

The present invention will be described in more detail below. As the metathesis-polymerizable cyclic olefin for forming the crosslinked polymer that constitutes the septic tank of the present invention, those containing 1-2 metathesis-polymerizable cycloalkene groups in the molecule are used. A compound having at least one norbornene skeleton in the molecule is preferable. Specific examples thereof include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene co-dimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenyl norbornene, 1,4,5,8-dimethano -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- 1,
4,4a, 5,6,7,8,8a-octahydronaphthalene,
6-ethylidene-1,4,5,8-dimethano-1,4,4a,
5,6,7,8,8a-heptahydronaphthalene, 1,4,
5,8-Dimethano-1,4,4a, 5,6,7,8,8a-hexahydronaphthalene, ethylene bis (5-norbornene) and the like can be mentioned, and a mixture thereof can also be used. Particularly, dicyclopentadiene or a mixture thereof containing 50 mol% or more, preferably 70 mol% or more is suitably used.

If necessary, a metathesis-polymerizable cyclic olefin having a polar group containing a different element such as oxygen and nitrogen can be used as a copolymerization monomer. Such a copolymerizable monomer also preferably has a norbornene structural unit, and the polar group is an ester group,
Ether groups, cyano groups, N-substituted imide groups, halogen groups and the like are preferable. Specific examples of the copolymerization monomer include 5-methoxycarbonylnorbornene and 5- (2-
Ethylhexyloxy) carbonyl-5-methylnorbornene, 5-phenyloxymethylnorbornene, 5-cyanonorbornene, 6-cyano-1,4,5,8-dimethano-1,4,4a, 5,6,7,8 Examples include 8,8a-octahydronaphthalene, N-butyl nadecimide, 5-chloronorbornene, and the like.

The monomer solution A (solution A) in the present invention contains a catalyst component of a metathesis polymerization catalyst system. As the catalyst component, salts such as halides of metals such as tungsten, rhenium, tantalum and molybdenum are used, and tungsten compounds are particularly preferable. As such a tungsten compound, tungsten hexahalide, tungsten oxyhalide, etc. are preferable, and more specifically, tungsten hexachloride, tungsten oxychloride, etc. are preferable. Further, organic ammonium tungstate or the like can also be used. It has been found that when such a tungsten compound is directly added to the monomer, it immediately starts cationic polymerization, which is not preferable. Therefore, such a tungsten compound is preferably suspended in an inert solvent such as benzene, toluene, chlorobenzene and the like in advance and solubilized by adding a small amount of an alcohol compound and / or a phenol compound to be used. Further, as described above, it is preferable to add about 1 to 5 mol of Lewis base or chelating agent to 1 mol of the tungsten compound in order to prevent undesired polymerization. Examples of such additives include acetylacetone, acetoacetic acid alkyl esters, tetrahydrofuran, and benzonitrile. When a polar monomer is used, it may be a Lewis base itself as described above, and it may have its action even if the above compound is not added. As described above, the monomer liquid A (solution A) containing the catalyst component has substantially sufficient stability.

On the other hand, the monomer liquid B (solution B) in the present invention contains an activator component of the metathesis polymerization catalyst system. This activator component is preferably an organometallic compound centered on an alkylated compound of a metal of Group I to Group III of the Periodic Table, particularly a tetraalkyltin, an alkylaluminum compound, an alkylaluminum halide compound, and specifically a chloride. Examples thereof include diethyl aluminum, diethyl aluminum chloride, trioctyl aluminum, dioctyl aluminum iodide, and tetrabutyl tin. A monomer liquid B (solution B) is formed by dissolving the organometallic compound as the activator component in the monomer.

Basically, the solution A and the solution B are mixed and poured into a mold to obtain a molded article of the desired crosslinked polymer. Is initiated very quickly, so that curing can occur before it has flowed sufficiently into the mold, which is often a problem. Therefore, it is preferable to use an activity regulator. As such a regulator, 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 adding it to the solution (solution B) side 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 the catalyst component, the ratio of the tungsten compound to the raw material monomer is
It is about 1,000 to 15,000 to 1, preferably about 2,000 to 1 on a molar basis, and when an alkylaluminum is used as the activator component, an aluminum compound for the above raw material monomer is used. The ratio of about 100 to 1 to 10,000 to 1, preferably 20.
The vicinity 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 depending on the amount of the catalyst system used by experiments.

The molded article of the present invention can basically be obtained by mixing the above-mentioned solution A and solution B and injecting them into a mold. At that time, the catalytic activity of the metathesis catalyst system formed by mixing the solution A and the solution B can be expressed by the time from when the two solutions are mixed to when the mixed solution loses fluidity. That is, if the time until the fluidity is lost is defined as the time from when both solutions are put in a glass container equipped with a stirrer until the solution gels and entangles with the stirring shaft of the stirrer, Solution A
And the solution B has a time of 1 to 1 at which the fluidity is lost at 30 ° C.
It is desired to be 120 seconds, preferably between 2 and 100 seconds.

The molded article of the crosslinked polymer obtained according to the present invention may further contain various additives depending on the purpose in order to improve or maintain the characteristics in practical use. Such additives include fillers, pigments, antioxidants, light stabilizers, flame retardants, polymer modifiers and the like. Such additives cannot be added after the crosslinked polymer of the present invention has been molded, and therefore, when added, it is necessary to add them to the above-mentioned raw material solution in advance.

The easiest method is the solution A described above.
And a solution B may be added in advance to either or both of them, but in that case, they do not react to a certain extent with the catalyst component and activator component having strong reactivity in the liquid and do not react to some extent. , And it should not interfere with the polymerization. If the reaction does not substantially hinder the polymerization even when the reaction is unavoidable, it is possible to prepare a third liquid by mixing with the monomer and mix and use it immediately before the polymerization. Further, the polymerization catalyst or activator is used as the third liquid, and solution A or solution B containing no third catalyst is used.
A method of adding the above-mentioned additive to the above is also considered. Further, in the case of a solid filler, when the two components are mixed and the shape is such that the voids can be sufficiently filled immediately before starting the polymerization reaction or during the polymerization, it is filled in the molding die. It is also possible to keep it. Reinforcing agents or fillers as additives are effective in improving the bending modulus. Examples of such a material include glass fiber, mica, carbon black, wollastonite and the like. Those obtained by surface-treating these with a so-called silane coupler can be preferably used.

Further, it is preferable to add an antioxidant to the molded article according to the present invention. Therefore, it is desirable to add a phenol type or amine type antioxidant to the solution in advance. Specific examples of these antioxidants include 2,6-di-t-butyl-p-cresol and N, N '.
-Diphenyl-p-phenylenediamine, tetrakis [methylene (3,5-di-t-butyl-4-hydroxycinnamate)] methane and the like.

Further, the molded product 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 enhancing the impact resistance of the molded product and controlling the viscosity of the solution. Elastomers used for such purpose include styrene-butadiene-styrene triblock rubber, styrene-isoprene-styrene triblock rubber, polybutadiene, polyisoprene,
There may be mentioned a wide range of elastomers such as butyl rubber, ethylene propylene-diene terpolymer, nitrile rubber.

Examples of the material of the mold for molding the septic tank of the present invention include steel, cast or forged aluminum, casting of zinc alloy and the like, thermal spraying, electroforming of nickel and copper, and resin. Also, the structure of the mold is sufficient because the pressure generated in the mold at the time of molding is several kg / cm ² , which is extremely low compared to other molding methods, and is therefore simpler and cheaper than molds of other molding methods. Can be made.

One of the features of the cyclic olefin cross-linked polymer molded article of the present invention is that it has excellent impact resistance and is not easily broken even when dropped or when solid matter such as pebbles collides. . Further, the molded article of the present invention basically does not need to use a reinforcing material such as glass fiber. Therefore, the flexural modulus is generally lower than those using these reinforcing materials. As a means for solving this, the present inventors have already proposed that a shape having an uneven rib having a specific structure is effective for a large-scale septic tank (Japanese Patent Application No. 5-285097; November 1993). 15th application a month). The large septic tank proposed earlier is a large septic tank composed of an upper tank part and a lower tank part, or an upper tank part, a lower tank part and an intermediate tank part of a plate-shaped belt connecting them, The large-sized septic tank is (1) a cross-linked polymer molded product of the cyclic olefin, and (2) at least the upper tank portion and the lower tank portion have rectangular concave and convex ribs in the longitudinal direction, and the concave and convex ribs are lateral to the septic tank. The average length of the width in the direction is 1.5 to 5 per 1 m, and (3) each of the uneven 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 in a cross section perpendicular to the length direction of the uneven ribs] , H indicates the height of the convex portion from the surface of the molded product, W indicates the width of the concave and convex portion, and R and R ′ are 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 characterized in that it satisfies. The large septic tank of the present invention may have such ribs, and is rather preferable. When the intermediate tank portion is provided, the intermediate tank portion can also have the same rib.

Next, the structure of the large-scale septic tank of the present invention will be described with reference to the drawings. The large-scale 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 members, an upper tank part, a lower tank part, and a plate-shaped intermediate tank part connecting them.

FIG. 1 shows an example of a large-scale septic tank of the present invention, A is a front view thereof, and B is a side view thereof. In FIG. 1, 1 is an upper tank part and 2 is a lower tank part.
In FIG. 1, the upper tank portion 1 and the lower tank portion 2 are fixed by flanges 3 and 3 '. Further, the upper tank portion 1 and the lower tank portion 2 may be fixed to each other by a plate-shaped intermediate tank portion connecting them. This intermediate tank part is not shown in FIG.
The intermediate tank portion is fixed between the upper tank portion and the lower tank portion, usually via a flange, between them. By providing this intermediate tank portion, a septic tank having an increased internal volume can be obtained. Further, in the large-sized septic tank of FIG. 1, ribs 4 and 4 ′ are provided in the vertical direction in the upper tank portion and the lower tank portion, respectively (the number of concave and convex ribs is four in the front view and two in the side view in FIG. 1). Is a book).

In the large-scale septic tank of the present invention, at least the upper tank portion and the lower tank portion are molded products of the crosslinked polymer of the metathesis-polymerizable cyclic olefin described above, preferably the upper tank portion,
All of the lower tank portion and the intermediate tank portion are molded products of this crosslinked polymer. Each of the upper tank portion, the lower tank portion, and the intermediate tank portion is also characterized in that they are integrally molded products.

Once the septic tank is installed, it will be used for a long period of 10 to 20 years or more, and water will enter the inside of the septic tank, so that water pressure will be applied to the inside of the septic tank. The durability and heat resistance are also required to be severe, such as the constant pressure.

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

That is, since the molded article of the present invention does not contain a reinforcing material such as glass fiber, the material itself has a low rigidity, but a rib in a grid pattern is provided on the surface opposite to the adhesive surface of the flange portion. It has improved rigidity and is a structure that can withstand water leakage due to internal pressure and external pressure.

Further, in order to supplement the rigidity of the material itself, an uneven rib shape may be provided in the longitudinal direction of the septic tank, and in order to increase the rigidity of the bottom part, the uneven part may be provided on the bottom part. 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 , 5 is a flange portion, and 6 is a joint surface in the flange portion. Lattice-shaped ribs 7 and 7 ′ are provided on the surface opposite to the joint surface 6. The height of the grid ribs 7 and 7'is h, and the width of the grid ribs is w. In FIG. 2C , the height h of the grid-like ribs is preferably in the range of 2 to 15 mm, particularly preferably 5 to 12 mm. Height h
Is less than 2 mm, the rigidity of the structure is less improved. On the other hand, when it is more than 15 mm, the lattice rib depth is too large, and the handling during molding becomes troublesome. The grid-shaped ribs do not need to 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. If the width w is smaller than 2.5 mm, it is not preferable in terms of the long-term physical properties of the material, and if it is thicker than 5 mm, it will 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 repeating distance d of the grid-like ribs (distance between the center lines of two grid-like ribs that are spaced apart and parallel to each other) is 10 to 150 mm, and the other distance d'is in the range of 10 to 1000 mm, preferably 10 to 100 mm, respectively. The range is -100 mm. When the repeating interval is smaller than 10 mm, not only the handling at the time of molding becomes troublesome, but also the lightness which is a characteristic of the glass-free structure is impaired. If the interval is too long, the rigidity will not be improved. The rib direction of the rib group having the interval d is preferably parallel to the longitudinal direction of the flange (the septic tank main body) or within a range intersecting with the septic tank main body at an angle of 30 ° or less. This is because the rigidity of the flange is more effective when the rib direction is closer to the parallel to the septic tank main body. An example is shown in FIG. 3 (partially enlarged plan view of the flange). The intersecting angles r and r ′ of the lattice ribs are in the range of 20 to 160 °, preferably 30 to 150 °. When the angle is smaller than 20 ° or larger than 160 °, one set of intersections always has an extremely acute angle, which is troublesome in molding. It is not necessary that all the crossing 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 existing in the flange portion (the surface opposite to the joint surface) viewed from the upper part (or the lower part) when the large-scale septic tank is assembled. FIG. 3 shows an example in which a set of grid-shaped ribs is provided substantially parallel to the longitudinal direction of the flange end portion 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 an intermediate tank part is formed separately. The molding method is already known,
For example, it is molded by the method disclosed in Japanese Examined Patent Publication No. 3-28451. Flange portions that serve as joints are provided at the openings of the upper tank portion and the lower tank portion, and by combining the flange portions, the upper tank portion and the lower tank portion are combined to form a septic tank. In the present invention, the volume of the septic tank can be increased by sandwiching the strip-shaped intermediate tank portion having upper and lower flanges between the flange portions of the upper tank portion and the lower tank portion. An adhesive may be used for the flange joint portion, and a band-shaped packing material made of synthetic rubber may be sandwiched.

Further, at the bolt or rivet position where the flange is joined, the thickness can be increased by raising the height of the grid rib. As a result, the workability of mounting is improved and the structure has a strong strength.

The thickness of the septic tank of the present invention is 3 mm or more, preferably 4 mm or more, more preferably 4.5 m because of its strength.
It is 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 the inside of a normal septic tank, and is divided according to each function such as an anaerobic tank, an aerobic tank, and a disinfection tank. Is filled with various members for efficiently purifying drainage and is provided with a running water channel. The large-scale septic tank of the present invention can be used as a single tank for treating human waste only or as a combined septic tank for purifying both human waste and domestic wastewater.

[0036]

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

[Mold] An aluminum mold containing the product shape shown in FIG. 1 was used. The dimensions of the septic tank made in the examples 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 solution] [Preparation of solution A] 20 parts by weight of tungsten hexachloride were added to 70 parts by weight of dry toluene under a nitrogen stream, and then a solution 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 produced by the reaction of tungsten hexachloride and nonylphenol, and further 10 volume of the solution. To 1 part by weight, 1 volume part of acetylacetone was added to obtain a polymerization catalyst.

Next, ethylene was added to a monomer mixture consisting of 95 parts by weight of purified dicyclopentadiene (purity 99.7% by weight, hereinafter the same) and 5 parts by weight of purified ethylidene norbornene (purity 99.5% by weight, hereinafter the same). 70
3% by weight of ethylene-propylene-ethylidene norbornene polymer rubber in mol%, and Ethanox 7 as an oxidation stabilizer
The above catalyst solution for polymerization was added to a solution containing 22 parts by weight so that the tungsten content was 0.01 / liter to prepare a monomer solution A (solution A) containing a catalyst component.

[Preparation of Solution B] Trioctylaluminum 85, dioctylaluminum iodide 15, and diglyme 100 were mixed and prepared at a molar ratio of 95 parts by weight of purified dicyclopentadiene and 5 parts by weight of purified ethylidene norbornene. Parts, ethylene content 70
A monomer mixture consisting of 3 parts by weight of ethylene-propylene-ethylidene norbornene polymer rubber (mol%) was mixed at a ratio of aluminum content of 0.03 mol / liter to prepare a monomer solution B (solution B) containing an activator component. Prepared. The viscosity of solution B was 300 cps at 30 ° C.

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

[Evaluation as a septic tank] The upper and lower tanks of the obtained cross-linked polymer molded product were fixed with bolts and adhesives through the flanges to obtain a product for evaluation. The product is FR
Three P partition plates are used and fixed with the same bolt and adhesive. The product satisfied both the rigidity test and the durability test based on JISA4101.

[Brief description of drawings]

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

FIG. 2 shows an example of a grid-like rib provided on the side opposite to the joint surface in the flange portion of the large-sized septic tank according to the present invention, where C is a cross-sectional view, and D is a pair of grid-like ribs that are separated from each other. The figure which showed the crossing part typically is shown.

FIG. 3 shows an enlarged view of a portion of the large-sized septic tank of the present invention in which the lattice ribs of the flange portion are present.

[Explanation of symbols]

 1 septic tank upper tank part 2 septic tank lower tank part 3, 3'flange 4, 4'rib 5 flange part 6 joint surface in flange part 7, 7'lattice-like rib 8 septic tank main body part 9 flange end part 10 bolt

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B29K 23:00 B29L 22:00

Claims (2)

[Claims] 1. A large-sized septic tank comprising an upper tank part and a lower tank part, or an upper tank part, a lower tank part and an intermediate tank part of a plate-shaped belt connecting them. (1) At least the upper tank part and the lower tank part contain 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 activator component of the metathesis polymerization catalyst system. Monomer liquid B containing the metathesis-polymerizable cyclic olefin contained therein (solution B)
And (2) a cross-linked polymer molded article obtained by mixing and mixing the raw material mixed solution into a mold to cause a polymerization and a cross-linking reaction in the mold. Alternatively, the upper tank portion, the intermediate tank portion, and the lower tank portion have a structure such that they are joined via a flange provided in a portion to be joined to each other, and (3) at each flange portion A large-scale septic tank having a grid-like rib on the opposite surface. 2. The grid-shaped rib has the following shape characteristics (i) to
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 shape Indicates the rib height of the rib in millimeters,
w is the average rib thickness in millimeters, d is the rib spacing of one set of grid ribs in millimeters, d'is the other rib spacing in millimeters, and r is the grid. The angle of the cross rib which comprises a shape is shown. ]