JP4771386B2 - Block member for rainwater storage tank - Google Patents

Description

  The present invention relates to a block member used in a rainwater storage tank that prevents flooding, soil runoff, and the like.

  For example, this type of block member described in Patent Documents 1 to 6 is molded from a synthetic resin such as polypropylene, and is used by being buried vertically and horizontally and buried in the ground. For such a use state, the block member is required to have compressive strength in the horizontal direction and the vertical direction.

JP 2002-309658 A JP 2006-200376 A JP 2002-309658 A JP-A-11-222886 JP 2007-16533 A JP 2008-157026 A

  By the way, in recent years, following the enforcement of the Containers and Packaging Recycling Law, plastic containers and packaging discharged from households are collected separately in municipalities, and the waste plastics that can be used are sorted by polypropylene and polyethylene. Attempts have been made to produce pellets by crushing, washing, etc., and molding an alternative product of the plastic product from the pellets.

  However, there are limits to removing impurities such as unnecessary plastic resin, wood scrap, glass, iron scrap, and paper scrap from waste plastics, and the current situation is that multiple synthetic resins and these impurities are mixed in the pellet material. It has become. When the block member is formed from such a pellet, the strength of the block member is reduced as compared with the case where the block member is formed from one synthetic resin (polypropylene) as in the prior art.

  Therefore, the present invention is a container packaging plastic material using a multilayer film material composed of a plurality of synthetic resins including polypropylene and polyethylene, even when using waste plastic so-called "containable material" It is an object of the present invention to provide a block member capable of ensuring the above.

In order to achieve the above object, the block member of the present invention is formed from waste plastic containing film-based polypropylene and polyethylene as main components, and is used for a rainwater storage tank, and projects upward from the base portion. A cylindrical peripheral wall and a leg portion having a top wall connected to the upper end of the peripheral wall, and the peripheral wall of the leg portion is formed such that the upper half is thicker than the lower half , and the upper half of the peripheral wall The part is formed so as to gradually increase in thickness over the top wall .

  According to the present invention, since the thick portion is formed in the leg portion, the compression strength of the leg portion can be easily improved in structure. In addition, by making the thick part partly, we consider reduction of material cost and weight reduction compared with the case where the thickness of the whole leg part (or the whole base part and leg part) is made uniform. However, the compressive strength can be ensured. Therefore, even when film-based polypropylene and polyethylene-based composite materials are used as raw materials, that is, when using “containable materials” that are generally said not to be strong, block members that ensure strength are provided. can do.

Preferably, the top wall may be formed to a thickness comparable to the upper end of the peripheral wall. By setting it as such a structure, compressive fracture strength can be improved about the upper part of the leg part far from a base part.

  In addition, the block member of the present invention may be molded from the above-mentioned waste plastic (“containable material”) to which a compatibilizing agent is added. By doing so, physical properties such as the strength of the waste plastic (“recovery material”) are improved, and the strength of the block member can be increased in terms of material.

It is a bottom view of the block member concerning an embodiment. It is sectional drawing of the block member cut | disconnected by the AA line shown in FIG. It is a right view of the block member shown in FIG.

A block member according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the block member 1 is integrally formed of a base portion 2 and four leg portions 3 protruding upward from the base portion 2. The number and position of the leg portions 3 are arbitrary. For example, in the case of one, the leg portions 3 may be projected from the center of the base portion 2.

  The base portion 2 includes a flat plate portion 10 having a square shape in plan view, and an edge portion 11 rising on the frame along the outer periphery of the flat plate portion 10. The flat plate portion 10 has four relatively large through holes 12 at the center, and also has through holes 14 in other portions such as a peripheral portion. The lower surface 16 of the flat plate portion 10 is formed as a flat surface, while a plurality of ribs 20 are formed on the upper surface 18 of the flat plate portion 10 so as to protrude upward. The rib 20 is connected to the edge portion 11 to increase the strength of the block member 1. In addition, the shape of the base part 2 can be changed in design as appropriate. For example, the flat plate part 10 can be circular.

  The leg portion 3 includes a cylindrical peripheral wall 30 and a top wall 32 that closes the upper end of the peripheral wall 30. The peripheral wall 30 protrudes upward from the upper surface 18 of the flat plate part 10, and is formed in a tapered shape so as to gradually become a small diameter upward. The cross section of the peripheral wall 30 can be arbitrarily formed such as a circle, an ellipse, or a polygon, but in the case of this embodiment, the center of curvature is alternately positioned inside and outside the leg portion 3. A plurality of curved surfaces are formed in line symmetry. The peripheral wall 30 is not formed with a through portion such as a hole. On the other hand, the flat top wall 32 is formed with four through holes 34, and a pair of engaging projections 36, 36 and a pair of engaging holes 38, 38 are formed outside the through hole 34. Yes.

  In particular, as shown in FIG. 2, the peripheral wall 30 of the leg 3 is partially formed thick to increase product strength. Specifically, the upper half portion 40 of the peripheral wall 30 is formed to be thicker than the lower half portion 42, and the upper half portion 40 of the peripheral wall 30 gradually increases in thickness toward the top wall 32. Is formed. The top wall 32 is also formed with the same thickness as the upper end portion of the peripheral wall 30. For example, the thickness of the flat plate 10 and the lower half 42 of the peripheral wall 30 is the same at 5 mm, whereas the thickness of the upper end 40 and the top wall 30 of the upper half 40 of the peripheral wall 30 is 7 to 8 mm. It has become. In order to increase the compressive fracture strength on the upper end side of the leg portion 3, it is preferable to increase the curvature of the arc portion connecting the peripheral wall 30 and the top wall 32. In another embodiment, the lower half 42 of the peripheral wall 30 may be partially thickened, or the top wall 32 may not be thickened. Strength can be improved.

  A plurality of the block members 1 configured as described above are stacked in the vertical direction in such a manner that the two are inverted in the vertical direction. In detail, in the stacked state, the two block members 1, 1 that are continuous in the vertical direction have the legs 3, 3 face each other, and the engagement protrusion 36 of one block member 1 is the other block member 1. By being engaged with the engagement holes 38, the coupling is performed. Further, in the other two consecutive block members 1, 1, the lower surfaces 16, 16 of the base portions 10, 10 are abutted against each other. At this time, they are coupled to each other by the engagement of the engagement protrusions formed on the respective base portions 10 and 10 and the engagement holes (both not shown). Finally, the plurality of block members 1 are mechanically connected in the vertical direction and the horizontal direction (or the edges 11 of the base part 2 are abutted against each other) so that they are connected in the vertical and horizontal directions and assembled. .

  The block member 1 is molded by a low-pressure injection molding method using a “container” waste plastic mainly containing film-based polypropylene and polyethylene as a main material. Usually, the method molded in Japan is a high-pressure injection molding method, but a film-type container packaging material having low fluidity is not suitable. Therefore, a low pressure injection molding method is used. Waste plastic is waste that is used for recycling mainly composed of plastic, and includes various plastic products discarded after use and impurities such as waste generated in the manufacturing process. The “recycled material” waste plastic according to the present embodiment is discharged from households, and is mainly composed of olefin plastics (so-called mixed olefins) such as film-based polypropylene and polyethylene, and the plastics as subcomponents. It contains impurities such as different unwanted plastics, wood chips, glass, iron scraps and paper scraps.

  A series of processes until the block member 1 is manufactured after the waste plastic is collected based on the container recycling method will be briefly described. First, polyethylene and polypropylene that can be used are selected from waste plastics, which are containers and packages provided by municipalities, etc., crushed, washed, separated by specific gravity, heated and melted, and made of stainless steel of 0.1 mm or less. The granular plastic raw material from which the foreign matter has been removed is manufactured using the above filter. Next, the plastic raw material is kneaded with a compatibilizing agent (additive) or the like to produce pellets, and the pellets are molded. Thereby, the block member 1 is shape | molded.

  Here, as the compatibilizing agent, for example, a reactive ethylene copolymer or the like can be used to improve physical properties such as strength of the plastic raw material, and among these, maricon is preferably used. Further, the blending ratio of the compatibilizing agent and the plastic raw material is preferably in the range of 1: 100 to 5: 100, more preferably 3: 100.

  According to the present embodiment described above, even if the block member 1 is molded using “plastic material” waste plastic, which is difficult to ensure strength, a thick portion (the upper half 40 and the top wall) is formed on the leg 3. 32) is formed, the compression strength of the leg 3 can be easily improved in structure. Moreover, since the thick part is not formed uniformly over the entire leg 3, but is formed partially on the leg 3, the material cost can be reduced while ensuring the compressive strength. Can do. In addition, since the weight can be reduced, there is an advantage that the transport efficiency of the block member 1 is improved.

  1: Block member 2: Base part 3: Leg part 30: Peripheral wall 32: Top wall

Claims (3)

In block members molded from waste plastics containing polypropylene and polyethylene as main components, and used in rainwater storage tanks,
A base part;
A cylindrical peripheral wall protruding upward from the base portion and a leg portion having a top wall connected to the upper end of the peripheral wall ;
The peripheral wall of the leg is formed such that the upper half is thicker than the lower half ,
The upper half part of the said surrounding wall is a block member currently formed so that it may become thick gradually toward the said top wall . Before Kiitadakikabe, the are formed in the thickness of the same level as the upper end of the peripheral wall, the block member according to claim 1. The block member according to claim 1 or 2 , wherein the block member is formed from a waste plastic added with a compatibilizing agent.

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