JP4296283B2 - Concrete block with lid plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete block such as a U-shaped groove block or a side groove block, and more particularly to a structure of a joint portion between a cover plate and a main body block in a concrete block of this type having a cover plate. The present invention relates to the structure of the above-mentioned part that prevents the cover plate from rattling due to the shape error of the joint and preventing noise.
[0002]
[Prior art]
A normal side groove block or U-shaped groove block is provided with a notch having an L-shaped cross section on the side in the longitudinal direction of the opening provided on the upper surface thereof, and a flat rectangular cover plate is fitted into this notch portion. The top opening is closed.
[0003]
A concrete block is formed with a welded formwork, but due to the structure of the formwork and the properties of the concrete block, it is impossible to achieve a high dimensional accuracy like a machined metal product. Therefore, in the concrete block provided with the cover plate, there is a problem that the cover plate rattles on the main body block and generates noise due to a dimensional error between the cover side joint surface and the main body block side joint surface.
[0004]
As means for preventing this noise, the inventor of this application disclosed in Japanese Patent Application Laid-Open No. 11-6194 and Japanese Patent Application No. 10-248288 one of the joint surfaces 9 and 14 between the cover plate 3 and the main body block 2. 9 is a plane inclined in a symmetric direction with respect to the center line P of the concrete block, and the other 14 is a concrete block including a cover plate having a partially cylindrical curved surface, and the cover plate 3 and the main body block 2 are mutually connected. One of the joining surfaces 9 and 14 is a plane inclined in a direction symmetrical to the center line P of the concrete block, and the other 14 is provided with a shallow angle ridge line projecting toward the one joining surface 9. A concrete block with a cover plate with a cross-section is proposed.
[0005]
According to the above structure, even if there is a certain amount of error between the shapes of the joint surfaces of the lid plate and the main body block, the lid plate is placed on the main body block in a self-aligned state and joined. As a result, it is possible to obtain a concrete block with a cover plate that does not generate noise even if the accuracy of the formwork is not so high.
[0006]
Furthermore, since the substantial surface pressure of the joint portion can be reduced by increasing the radius of curvature of the cylinder and making the ridge line a ridge line having a shallow angle, there is no problem in strength.
[0007]
[Problems to be solved by the invention]
By presenting a structure not explicitly described in the above proposal, the present invention enriches the variations of the above technology and diversifies the structures that can be selected. It is an object to make the above technical means more widely implemented according to the strength required for the above.
[0008]
[Means for Solving the Problems]
The concrete block provided with the cover plate according to the first aspect of the invention is configured so that one of the joint surfaces 9 and 14 between the cover plate 3 and the main body block 2 is symmetrical with respect to the center line P of the concrete block. In a concrete block provided with a cover plate having an inclined plane and the other 14 having a partially cylindrical curved surface, the cover 11 is parallel to each other and does not have a notch such as a drainage notch, and the inward direction of the lid of the main body block And the other joining surface 14 which is formed into a flat surface having a concave shape with a straight line in the longitudinal direction or toward the lid plate, and is formed into a partially cylindrical curved surface. Is formed in a protruding shape only at the four corners of the cover plate.
[0009]
A second aspect of the present invention is the concrete block provided with the lid plate according to the first aspect, wherein the partially cylindrical curved surface formed in the shape of a protrusion is a portion in which the curvature in the longitudinal direction of the joint surface is smaller than the curvature in the direction perpendicular to the longitudinal direction. It is a via barrel cylindrical curved surface.
[0010]
Further, the invention of claim 3 is the concrete block provided with the lid plate of claim 1, the partially cylindrical curved surface formed in a protruding shape, the curvature in the longitudinal direction of the joint surface is equal to the curvature in the direction perpendicular to the longitudinal direction, It is a partially spherical curved surface.
[0011]
The concrete block provided with the cover plate according to the invention of claim 4 is configured so that one of the joint surfaces 9 and 14 of the cover plate 3 and the main body block 2 is symmetrical with respect to the center line P of the concrete block. In a concrete block having an inclined flat surface and a cover plate having a V-shaped cross section with a ridge line with a shallow angle projecting toward the one joint surface 9 on the other 14 side, the concrete blocks are parallel to each other and have a notch such as a drain notch. The side wall 11 of the lid plate and the inward surface 8 of the lid of the main body block are provided, and the one joining surface 9 as the flat surface is a straight line in the longitudinal direction or a flat surface having a concave shape toward the lid plate side. The other joining surface 14 formed and having the V-shaped cross section is formed in a protruding shape only at the four corners of the cover plate.
[0012]
According to a fifth aspect of the present invention, in the concrete block provided with the cover plate according to the fourth aspect, the V-shaped cross-sectional portion formed in a protruding shape has a shallower angle than the V-shaped direction perpendicular to the longitudinal direction of the joining surface. This is a V-shaped cross-sectional portion having a ridge.
[0013]
According to a sixth aspect of the present invention, in the concrete block having the lid plate according to the fourth aspect, the V-shaped cross-sectional portion formed in a protruding shape has an angle equal to the V-shaped direction perpendicular to the longitudinal direction of the joint surface. It is a V-shaped cross-section portion having a shape ridge.
[0014]
When a partially cylindrical curved surface or V-shaped cross section is provided on the lid plate side, the projecting curved surface or V-shaped cross section is formed at the four corners of the lid plate, and the partially cylindrical curved surface or V-shaped cross section is the main body. When provided on the block side, the projecting curved surface or V-shaped cross-section is formed in a portion facing the four corners of the lid plate when the lid plate is placed on the main body block.
[0015]
[Action]
In the conventional structure proposed by the inventor of this application, if only the linearity in the longitudinal direction between the joint surfaces of the cover plate 3 and the main body block 2 is managed, the cover plate 3 placed on the main body block 2 is It is self-aligning, and the lid 3 does not play back. The management of the straightness is to prevent the joining surface from being curved in a convex shape in the longitudinal direction toward the other side. When the joining surface has an intermediate convex shape, the cover plate is supported by the main body block so as to be swingable like a seesaw, and therefore it is obvious that the cover plate will rattle.
[0016]
Since an error in manufacturing always occurs in the product, the linearity in the longitudinal direction of the joint surface between the cover plate and the main body block is managed so that the error appears in a concave shape. Such control is generally performed on the joint surface of the concrete block, but how much error occurs when molding the block depends on the level of mold manufacturing technology and block molding technology. It depends on. When designing a mold for molding a concrete block, the joining surface is designed to have a slightly concave shape toward the mating side in consideration of manufacturing errors occurring on the joining surface. The degree of making the recesses is determined in consideration of the level of technology of how accurately the molds and concrete blocks can be manufactured and molded.
[0017]
In the above-described conventional structure, when the degree of the concave portion in the longitudinal direction of the joint surface is set larger than necessary, the cover plate is substantially supported at the four corners. Since a mathematically exact straight line cannot be realized when manufacturing an actual concrete block, strictly speaking, a cover plate of a concrete block having a cover plate manufactured by the above-described prior art has four-point contact at the four corners and the joint surface. It can be said that it is supported in an intermediate contact state with the line contact in the strict sense of the longitudinal direction.
[0018]
The present invention clarifies that the curved surface or the V-shaped cross section of the joining surface in the conventional means can be formed in the four corners of the lid plate in the shape of protrusions from the above-described reality. There is no substantial difference between designing the joint surface to have a slightly concave shape in the longitudinal direction and forming the curved surface and V-shaped cross-section at low corners at the four corners of the lid plate. It is.
[0019]
In the inventions of claims 2 and 5, when a cylindrical curved surface or V-shaped cross section is formed at the four corners of the cover plate, the shape of the projection is a curved surface or shallow ridge having a small curvature also in the longitudinal direction of the joint surface. It is clarified that a V-shaped cross-section having the following can be obtained. Incidentally, a straight line in the longitudinal direction of the joint surface means that the curved surface has a curvature of 0 and a V-shaped cross section having an angle of 180 degrees in that direction. The smaller the curvature and the angle in the longitudinal direction of the joint surface (the shallower the shallower), the smaller the stress at the contact portion, which is preferable in terms of strength.
[0020]
The inventions of claims 3 and 6 show that the protrusion can be a V-shaped cross section having ridges of the same angle in the longitudinal direction and the longitudinally perpendicular direction of the partial spherical surface or the joining surface. However, this shape is disadvantageous in that the local stress at the contact portion is higher than those in claims 2 and 4, and is not a preferred shape. This structure is practical only when the load applied to the cover plate is small.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a first embodiment of the present invention. The concrete block of this embodiment includes a U-shaped groove block 2 having a water channel 1 and a set of two cover plates 3 that close the water channel 1.
[0022]
The U-shaped groove block 2 forms a water channel 1 by a bottom portion 4 and both side wall portions 5, and a water channel side ridge line portion of the upper surface 6 of the side wall portion is cut out in a reverse-shaped cross section. , An inward surface 8 having a draft angle, and a joint surface 9 extending from the lower edge of the inward surface so as to be inclined downward are formed. The inward surfaces 8 and the joint surfaces 9 on both sides are symmetric with respect to the center line P of the U-shaped groove block 2.
[0023]
On the other hand, the cover plate 3 is a rectangular plate shape whose width is slightly narrower than the interval between the inward surfaces 8 of the side wall portions in a plan view, and the length is usually 1/2 to 1/4 of the groove block. The cover plate 3 has a side surface 11 parallel to the inward surface 8 of the side wall, and the upper surface 12 and the lower surface 13 of the cover plate are parallel to each other. A portion where the lower surface 13 and the side surface 11 are connected is an inclined surface 16 having the same angle as the joint surface 9 of the U-shaped groove block 2, and a partial cylindrical low protrusion 14 is formed at both end portions (four corner portions of the cover plate). Is formed.
[0024]
The protrusion 14 has a partial short cylindrical shape with a longitudinal curvature of 0 as shown in FIG. 1, a partial via barrel cylindrical shape with a curvature smaller than the longitudinally perpendicular direction to the longitudinal direction, as shown in FIG. It can be a partial spherical shape as shown.
[0025]
FIG. 5 shows a second embodiment of the present invention, in which the cross-sectional shapes of the projections 14 at the four corners of the cover plate 3 are shallow V-shapes facing diagonally outward.
[0026]
The protrusion 14 of the second embodiment has a shape in which a linear ridge line is formed in the longitudinal direction as shown in FIG. 6, and a V-shaped cross section that is shallow in the longitudinal direction as shown in FIG. The shape of the protrusion can be a rhombus shape, or, as shown in FIG. 8, the protrusion can have a square shape with a V-shaped cross section having an angle equal to the direction orthogonal to each other.
[0027]
In the first and second embodiments described above, the projections 14 are provided on the lid plate side. Such projections are U-shaped groove blocks as shown in the third embodiment of FIGS. It can also be provided on the second side. The positions where the protrusions 14 are provided in this case are portions facing the four corners of the cover plate 3 placed in the upper surface opening. Any of the various shapes shown in the first embodiment and the second embodiment can be adopted as the shape of the protrusion 14, and the feature of each shape is a U-shaped groove block even when provided on the cover plate side. It is the same when it is provided on the side.
[0028]
The main body block 2 shown in FIGS. 9 and 10 is a variable gradient type block, and the opening 19 on the upper surface thereof is closed by two cover plates 3. Both sides of the opening 19 are notched in an inverted cross-sectional shape. The notch is formed by an inward surface 8 having a draft angle and a slope 16 that is inclined in a direction that is lowered inward from the lower edge of the inward surface. The low protrusion 14 of the partial cylindrical shape is formed in the longitudinal both ends and center part of the said slope.
[0029]
On the other hand, a portion where the lower surface 13 and the side surface 11 of the cover plate 3 are connected to each other is a cover-side joint surface 9 formed of a plane parallel to the slope 16 on the main body side. At the center in the longitudinal direction of the side surface 11 of the cover plate 3, half the difference between the distance between the inward facing surfaces 8 of the openings and the width of the cover plate 3 (when the cover plate 3 is placed at the exact center of the opening 19, Side projections 21 having a projection amount smaller than the dimension of the gap 20 formed between the side 11 and the inward surface 8 of the opening are provided. By providing such side projections 21 on the side surface 11 of the cover plate or the inward surface 8 of the main body block, it is possible to prevent the cover plate 3 from moving laterally on the main body block 2.
[0030]
When the cover plate 3 is fitted in the opening 19 of the main body block 2, the longitudinal ends of the joint surfaces 9 on both sides of the cover plate are portions that are half the length of the protrusion 14 at the end of the inclined surface 16 on the main body and the protrusion at the center. Supported by The rattling of the cover plate 3 can be prevented by the aligning action similar to the case of FIGS. When the protrusion 14 has a shape as shown in FIGS. 3, 4 and 7, 8, the central protrusion is formed by two adjacent protrusions.
[0031]
As shown in FIG. 11, the protrusion 14 may be formed by sticking a protrusion forming member 26 having a cylindrical surface with the slope 25 shown in FIG. it can. Of course, the protrusion forming member 26 may have a V-shaped cross section as shown in FIG. Such a protrusion forming member 26 can be formed of an aluminum casting, stainless steel cut out, hard rubber, synthetic resin, or the like. In this structure, when a concrete block having a conventional structure is already installed, the projection forming member 26 is attached to the installed main body block, and only the cover plate 3 is replaced, so that the present invention can be implemented.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a first embodiment. FIG. 2 is an enlarged view of a main part of the first embodiment. FIG. 3 is a perspective view showing another shape of a cover plate of the first embodiment. FIG. 5 is a perspective view showing still another shape of the lid plate of the embodiment. FIG. 5 is an enlarged view of a main part of the second embodiment. FIG. 6 is a perspective view of the lid plate of the second embodiment. FIG. 8 is a perspective view showing another shape of the lid plate of the second embodiment. FIG. 9 is an exploded perspective view of the third embodiment. FIG. 10 is a third embodiment. Fig. 11 is an enlarged view of the main part of the fourth embodiment. Fig. 12 is a perspective view of the protrusion forming member of the fourth embodiment.
2 U-shaped groove block 3 Lid plate 9 Inclined planar joining surface
11 Side of cover plate
14 Partially cylindrical or V-shaped protrusion P Center line

Claims (6)

One of the joint surfaces (9, 14) of the cover plate (3) and the main body block (2) (9) is a plane inclined in a direction symmetrical to the center line (P) of the concrete block, and the other ( In a concrete block with a cover plate having a partially cylindrical curved surface as shown in FIG.
A side wall (11) of the lid plate that is parallel to each other and has no cutout and an inward surface (8) of the lid of the main body block, and one joining surface (9) that is the plane is straight or longitudinally It is formed in a flat surface with a concave shape toward the cover plate side, and the other joining surface (14) which is the curved surface of the partial cylindrical shape is formed in a protruding shape only at the four corners of the cover plate. , Concrete block with lid plate. The concrete block provided with a cover plate according to claim 1, wherein the partially cylindrical curved surface formed in the shape of a protrusion is a curved surface of a partial via barrel cylindrical shape in which the curvature in the longitudinal direction of the joint surface is smaller than the curvature in the direction perpendicular to the longitudinal direction. . The concrete block provided with the cover plate according to claim 1, wherein the partially cylindrical curved surface formed in a protruding shape is a partially spherical curved surface in which the curvature in the longitudinal direction of the joint surface is equal to the curvature in the direction perpendicular to the longitudinal direction. One of the joint surfaces (9, 14) of the cover plate (3) and the main body block (2) (9) is a plane inclined in a direction symmetrical to the center line (P) of the concrete block, and the other ( In a concrete block provided with a cover plate having a V-shaped cross section with a shallow ridge line protruding toward the one joint surface (9) 14),
A side wall (11) of the lid plate that is parallel to each other and has no cutout and an inward surface (8) of the lid of the main body block, and one joining surface (9) that is the plane is straight or longitudinally A lid characterized in that it is formed in a flat surface with a concave shape toward the lid plate side, and the other joint surface (14) having the V-shaped cross section is formed in a protruding shape only at the four corners of the lid plate. Concrete block with board. 5. The lid plate according to claim 4, wherein the V-shaped cross-sectional portion formed in a protruding shape is a V-shaped cross-sectional portion provided with a V-shaped ridge having a shallower angle than the V-shaped perpendicular to the longitudinal direction of the joint surface. Concrete block. 5. The lid plate according to claim 4, wherein the V-shaped cross-sectional portion formed in a protruding shape is a V-shaped cross-sectional portion provided with a V-shaped ridge having an angle equal to a V-shaped direction perpendicular to the longitudinal direction of the joint surface. Concrete block.

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