JP4456986B2 - Method for producing immediate demolding concrete product and concrete lid - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete lid used for a concrete flat plate or block used for road pavement and a lid for a waterway / gutter such as a U-shaped groove, and particularly manufactured by an immediate demolding method such as vibration pressure molding. The present invention also relates to a method for producing a concrete product in which a sheet-like elastic cushioning material is integrated in order to prevent the occurrence of rattling noise and jumping, and a concrete lid in which the sheet-like elastic cushioning material is integrated.

Concrete products with lids such as road gutters and catchment basins are classified into a lid type and an upper lid type depending on the lid type. In these concrete products, if there are inclusions such as pebbles between the lid hanging part of the main body and the back of the lid, or if the main body or the lid itself is warped or deformed, it is likely to cause jumping up and rattling noise. There was a problem.

Conventionally, with respect to such problems, firstly, a measure for providing a cushioning material such as rubber between the lid hanging portion of the main body and the back surface of the lid (JP-A-1-247624), and secondly, the main body and the lid Measures for fixing sound (utility model registration No. 2526667, etc.), and thirdly, the shape of the lid hooking portion of the main body or the back contact portion of the lid is made special to make a line or point contact, and a measure for expecting a soundproof effect ( Japanese Patent No. 2863151).

Above all, the first countermeasure, in which a cushioning material such as rubber is provided between the lid hanging portion of the main body and the back surface of the lid, has been widely implemented, and the cushioning material such as rubber is integrated with the lid itself. Molded (JP-A-1-247624, etc.) or bonded (Actual Japanese Utility Model Publication No. 5-21587, etc.)
Is known.

JP-A-1-247624 Utility Model Registration No. 2526667 Japanese Patent No. 2863151 Japanese Utility Model Publication No. 5-21587

On the other hand, in a concrete flat plate or block used for road pavement, a rubber chip molded body or a rubber plate is integrated as a product surface layer portion for the purpose of preventing slipping and reducing a load during traveling. Alternatively, a structure in which a buffer layer is provided on the product back layer portion may be considered.

In such concrete products with integrated cushioning material, the concrete is either fixed by placing the cushioning material on the bottom of the mold and integrated with it, except when the concrete is hardened and pasted with an adhesive, etc. Once the concrete is cast and before it is completely cured, a cushioning material is placed on the surface of the uncured concrete, and a means is taken to integrate the concrete simultaneously with the curing of the concrete. In general, some kind of anchor is provided on the back surface of the cushioning material so as not to peel off.

By the way, in general, concrete products are generally manufactured by casting concrete, but for products having a relatively simple shape such as a concrete lid, the manufacturing method by immediate demolding such as vibration pressure molding is efficient. Is. However, in most of the products that are molded integrally with a cushioning material such as rubber as described above, casting molding is assumed,
It is assumed that the method cannot be applied to production by an immediate demolding method. This is because in the immediate demolding method that involves a pressurizing process, when an elastic cushioning material such as rubber is molded as one piece, the concrete cracks or collapses due to the elastic body returning after the pressure is released (spring back). This is because the drowning to do is great.

On the other hand, unlike cast concrete, in the immediate demolding method in which a concrete having a relatively low water content ratio and papasa is used and molded by pressure molding or vibration pressure molding, when the sheet-like cushioning material is molded integrally, Even if it can be molded, its integrity remains a question. For example, when a sheet-like cushioning material is formed integrally, it is conceivable to provide a protrusion having an anchor portion embedded in concrete as disclosed in Japanese Utility Model Publication No. 62-125185. This is because the minute portion does not sufficiently enter the anchor portion, and adhesion may not be ensured. The vibration pressurization immediate demolding method requires a sufficient filling rate, and in order to ensure the integrity with the sheet-like cushioning material, there are unprecedented contrivances regarding the protrusion shape or attachment structure with protrusions or anchors. It is necessary to apply.

Japanese Utility Model Publication No. 62-125185

In producing a concrete product in which a sheet-like elastic cushioning material is integrated by an immediate demolding method such as vibration pressure molding, etc., the present invention eliminates molding obstacles due to springback of the elastic cushioning material depressurized by demolding. The purpose of the present invention is to provide a method for producing a soundproof concrete product in which the sheet-like elastic cushioning material and the concrete are sufficiently integrated, and a concrete lid that prevents rattling noises.

In order to achieve the above object, the first invention of the present application is embedded in concrete in an immediate demolding method of a concrete product integrated with a sheet-like elastic cushioning material molded by pressure molding or vibration pressure molding. The sheet-like elastic cushioning material provided with projections is pre-installed in a mold and cut and arranged longer than the maximum size of the concrete fine aggregate to be placed on both ends of the projections. The second invention of the present application is characterized in that the sheet-like elastic cushioning material is made of rubber or resin having elasticity.

In order to achieve the above object, the third invention of the present application is characterized in that the projection of the sheet-like elastic cushioning material is provided with an anchor portion at the top thereof, and the fourth invention of the present application is The length of the projection of the sheet-like elastic cushioning material from the sheet surface to the lower surface of the anchor is not less than the maximum size of the fine aggregate of the concrete, and the fifth invention of the present application is a protrusion from the side of the projection of the anchor A method for producing an immediate demolding concrete product, characterized in that the length is ½ or less of the maximum size of the fine aggregate of the concrete.

According to a sixth aspect of the present invention, in the lid of a concrete product manufactured by pressure molding or vibration pressure molding, a contact surface of the back surface of the concrete product with the lid engaging portion of the concrete product in order to prevent rattling noise. A configuration in which sheet-like elastic cushioning material is integrally installed and both longitudinal ends of projections embedded in the concrete of the sheet-like elastic cushioning material are cut at least longer than the maximum size of the concrete fine aggregate; This is an immediate demolding concrete lid.

Further, according to a seventh aspect of the present invention, the projection portion in which the sheet-like elastic cushioning material is embedded in the lid body has an anchor portion at the top portion, and the length of the anchor portion from the seat surface is the length of the concrete. An instantly-demolded concrete lid characterized in that it is configured to be larger than the fine aggregate maximum dimension, and the seventh invention of the present application is characterized in that the protruding length of the anchor portion from the side surface of the protrusion is the fine bone of the concrete An immediate demolding concrete lid characterized in that it is configured to be ½ or less of the maximum material size.

Since the present invention is configured as described above,
(1) At the time of molding in immediate mold removal, there is no crack etc. at the end of the concrete product due to the spring back of the sheet-like elastic cushioning material,
(2) Adhesion between the sheet-like elastic cushioning material and concrete is sufficient.
(3) It is possible to provide a method for producing an immediate demolding concrete product integrated with a sheet-like elastic cushioning material,
(4) A concrete lid with excellent soundproofing effect can be produced continuously.
There are effects such as.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIG. 1 is a flow diagram of the method of the present invention, which is the same as the production method of a normal immediate demolding concrete product. When a reinforcing bar such as a reinforcing bar mesh is required, the reinforcing bar is arranged by a spacer or the like so as to have a certain cover.

As the sheet-like elastic cushioning material used in the present invention, commercially available embedding rubber sheets A _1, A _{2 and} A ₃ as shown in FIGS. 2 (a), (b) and (c) are used. However, in the present invention, as shown in FIG. 2 (c), a belt-like sheet main body 1, an upright portion 2 protruding from the center in the width direction of the sheet main body 1, and an anchor provided on the top portion thereof. A sheet-like elastic cushioning material A3 composed of an embedding protrusion 4 composed of the portion ₃ is recommended. The material of the sheet-like elastic cushioning material is preferably made of rubber, but may be made of resin as long as it has a certain elastic effect, and may be recycled material or compound material.

However, in the present invention, as shown in the concrete product of FIG. 3, the sheet-like elastic cushioning material A (A _1, A _2, A ₃ ) shown in FIG. 2 (a), (b) and (c) respectively. And the longitudinal direction both ends 4A and 4B of the projection part 4 are cut from the edge part R of the concrete product W at least longer than the fine aggregate maximum dimension of the concrete used. That is, for example, when the maximum aggregate size of the fine aggregate is 5mm, the longitudinal ends 4A and cut length L ₁ of 4B of the projections 4 is greater than 5mm, respectively.

Further, in the present invention, the type of sheet-like elastic cushioning material A ₃ shown in FIG. 2 (c), has proposed a desirable form for the standing part 2 and the anchor portion 3 constituting the protruding portions 4. That is, as shown in FIG. 4, the rising length L ₂ from the upper surface 1A of the seat body 1 standing portion 2 is at least fine aggregate maximum dimension of the concrete for pouring, as desired form, the anchor portion protruding length L ₃ than the standing part 2 side of the 3 is proposing that 1/2 or less of the fine aggregate maximum dimension of the concrete. Hereinafter, the present invention will be described based on examples.

Table 1 shows ordinary concrete with a coarse aggregate maximum dimension of 10 mm and a fine aggregate maximum dimension of 5 mm (fine aggregate ratio of 64%, water cement ratio of 36.5%), coarse aggregate maximum dimension of 15 mm, and fine aggregate maximum dimension of 5
mm cinder (fine aggregate ratio of 60%, water-cement ratio of 30%) using a sheet-like elastic with different end portions 4A and cut length L ₁ of the 4B of the protruding portions 4 into a mold bottom plate of the vibrating press molding machine The result of arranging and forming the buffer material is shown. The sheet-like elastic cushioning material, using the sheet-like elastic cushioning material A ₃ of the type shown in the FIG. 2 (c).

When both longitudinal ends 4A and 4B cut length L ₁ of the projecting portion 4 is less fine aggregate maximum dimension of the concrete for pouring the cracks toward the upper surface from the pressure surface is likely to occur, cut length L ₁ is not such a crack was observed in the case longer than the fine aggregate maximum dimension of the concrete for pouring. The one concrete filling of the corners of the product W is bad if: coarse aggregate maximum dimension of concrete cut length L ₁ is pouring, the corner of the product W in case of greater than coarse aggregate maximum dimension of the concrete Concrete filling was sufficient in the part.

In this way, the longitudinal end portions 4A and 4B of the projection 4 formed on the sheet-like elastic cushioning material A are cut and arranged longer than the maximum size of the concrete fine aggregate to be placed, so that the elastic cushioning material It is possible to eliminate molding obstacles due to springback at the time of demolding, and to prevent generation of cracks. In order to sufficiently fill the four corners of the product W with concrete, the concrete may be cut longer than the maximum size of the coarse aggregate of the concrete.

FIG. 4 shows a sheet-like elastic cushioning material with a projection for embedding. In the present invention,
The protrusion 4 of the sheet-like elastic cushioning material A is specified in detail for immediate demolding using hardened concrete. That is, the protruding portion 4 embedded in the concrete is provided with an anchor portion 3 having a width larger than the width of the standing portion 2 at the top of the standing portion 2, and the lower surface of the anchor portion 3 from the seat surface 1A of the standing portion 2. up to a length L ₂ of the concrete used the fine aggregate maximum diameter or less on, preferably, protruding length L ₃ than the standing part 2 side of the anchor portion 3 is fine aggregate maximum diameter of the concrete 1 / 2 or less.

Table 2, the effect on the integral of the length L ₂ from the sheet surface 1A of the standing portion 2 constituting the protruding portions 4 of the sheet-like elastic cushioning material A to the anchor portion 3 lower face immediate demolding concrete Table 3 shows the upright portion 2 of the anchor portion 3 that also constitutes the protruding portion 4.
Protrusion of the side surface length L ₃ is obtained by considering the effect on the integral of the immediate demolding concrete. The sheet-like cushioning material A ₃ (type (c)) in which the normal concrete composition and the cut length L ₁ are made larger than the fine aggregate maximum size as in Example 1 is used to form a sheet on the mold bottom plate of the vibration press molding machine. A cushioning material was placed and molded by a vibration press molding machine.

No integrity when the sheet surface 1A of the standing portion 2 anchor portion 3 lower surface to the length L ₂ is extremely short, in a state where after the concrete curing even sheet causes easily peeled. Minimum length of L ₂ is the maximum diameter of the fine aggregate, it is necessary mortar enters enough. On the other hand, the longer L ₂ is, the greater the unity is. However, there is a concern that when the protrusion 4 is not reinforced, it is crushed by the applied pressure. Further, the protruding length L ₃ from the side of the standing portion 2 of the anchor portion ₃
If this is long, it is considered that a gap is formed in the lower part of the anchor part 3, and the integrity is insufficient even if the sheet does not come off. The protrusion of the anchor portion 3 does not need to be excessively provided, and is desirably set to be ½ or less of the maximum size of the fine aggregate so that the mortar portion can sufficiently move below the anchor portion.

From the above results, when the cut length L ₁ is longer than the maximum size of the concrete fine aggregate, cracks do not occur in the corners of the product W, but the cut length L ₁ is less than the maximum size of the concrete fine aggregate. In this case, it can be seen that cracking occurs and molding is impossible. Further, even when the long cut length L ₁ than the fine aggregate maximum dimension of the concrete, in particular, of the concrete in which the length L ₂ of the protruding portion 4 of the sheet-like elastic bumpers protrusion portion 4 is embedded fine bone not less than the maximum dimension of the wood, and if the protrusion length L ₃ than the standing part 2 side of the anchor portion 3 was used is 1/2 or less fine aggregate maximum dimension of the concrete, the sheet-like elastic cushioning material a It can be seen that the unity of concrete is strong.

Table 4 shows a comparison of rattling noise with a conventional lid that does not have a sheet-like elastic cushioning material by fitting the side-groove lid of the sheet-like elastic cushioning material A integrated in Example 1 and Example 2 into the side groove body. It is. It was found that the sheet-like elastic cushioning material-integrated side groove lid manufactured in Example 1 and Example 2 has no backlash and has a sufficient noise reduction effect. However, if L ₁ becomes excessively long, the exposure of the concrete becomes large and the silencing effect becomes insufficient. If L ₂ becomes excessively long, the sheet-like elastic cushioning material A is easily deformed and becomes uneconomical, and the L ₃ is excessive. Since the anchor effect is lost when the length becomes shorter, L ₁ is the maximum size of the fine aggregate, and is approximately the maximum size of the coarse aggregate, L ₂
Is slightly larger than the largest dimension of the fine aggregate, L ₃ is substantially it is desirable that the maximum dimension half the fine aggregate.

It is a flowchart figure which shows the process of this invention method. It is a perspective view of an embodiment which omitted a part of sheet-like elastic buffer material. They are a front view (a), a right side view (b), and a bottom view (c) of a concrete product integrated with a sheet-like elastic cushioning material. It is an expansion partial perspective view of a sheet-like elastic buffer material.

Explanation of symbols

A sheet-like elastic cushioning material 1 strip-shaped sheet body 2 standing part 3 anchor part 4 projection part 4A, 4B both ends of the projection part L ₁ cut length of the projection part L ₂ length from the sheet surface of the standing part to the lower surface of the anchor part L ₃ Projection length from side of standing part of anchor part W Concrete product

Claims (8)

In a method for immediate demolding of a concrete product integrated with a sheet-like elastic cushioning material molded by pressure molding or vibration pressure molding, the sheet-like elastic cushioning material provided with protrusions embedded in the concrete is pre-molded A method for producing an immediate demolding concrete product, characterized in that it is cut and arranged and molded longer than the maximum size of the concrete fine aggregate to be placed on both ends of the projection. 2. The method for producing an immediate demolding concrete product according to claim 1, wherein the sheet-like elastic cushioning material is made of rubber or resin having elasticity. The method for producing an immediate demolding concrete product according to claim 1 or 2, wherein the protrusion of the sheet-like elastic cushioning material is provided with an anchor at the top. 4. The method for producing an immediate demolding concrete product according to claim 3, wherein a length from the sheet surface of the protruding portion of the sheet-like elastic cushioning material to the anchor portion is equal to or greater than a maximum fine aggregate size of the concrete. The immediately extruding concrete product according to claim 4, wherein a protruding length of the sheet-like elastic cushioning material from the side surface of the protrusion of the anchor portion is ½ or less of a maximum fine aggregate size of the concrete. Production method. In the lid of concrete products manufactured by pressure molding or vibration pressure molding, in order to prevent rattling noise, a sheet-like elastic cushioning material is installed integrally on the contact surface with the lid engaging portion of the concrete product on the back of the lid Immediate demolding, characterized in that the sheet-like elastic cushioning material has a configuration in which both ends in the longitudinal direction of the projection embedded in the concrete are cut longer than the maximum size of the fine aggregate of the concrete. Concrete lid. The protrusion embedded in the lid body of the sheet-like elastic cushioning material has an anchor portion at the top thereof, and the length until the anchor portion rises from the sheet surface is equal to or greater than the maximum size of the concrete fine aggregate; The instantly-demolded concrete lid according to claim 6, wherein 8. Immediately demolding concrete according to claim 7, characterized in that the length of protrusion of the sheet-like elastic cushioning material from the side surface of the protruding portion of the anchor portion is ½ or less of the maximum fine aggregate size of the concrete. Lid made.

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