JPH11152788A - Concrete block with cover plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the looseness of a cover plate due to molding error in the joining sections of the cover plate and a main-body block and the generation of noises by placing the cover plate on the main-body block under the state, in which the cover plate is self-aligned, even when there is an error in some extent between the mutual joint surfaces of the cover plate and the main-body block. SOLUTION: One 9 of the mutual joint surfaces 9, 14 of the cover plate 3 and a main-body block 2 is formed in a plane inclined in the symmetrical direction to the center line P of the concrete block, and the other 14 is formed in a partial cylindrical curved surface or the other 14 is formed in a V-shaped cross section having a ridgeline at a shallow angle projected towards one joint surface 9. The torsion of the cover plate 3 and an error in the height direction of the joint surface 9 of the main-body block are absorbed automatically by displacement in the horizontal direction of the cover plate 3, and the line-contact states of the joint surfaces on both sides are ensured even when there are the errors of the angle of inclination on the side formed in the plane and the center of curvature and the radius of curvature on the side formed in the cylindrical surface at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 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-described portion, which prevents generation of noise due to rattling of a cover plate due to a shape error of a joint portion between a plate side and a body block side.

[0002]

2. Description of the Related Art An ordinary side groove block or U-shaped groove block is provided with a notch having an L-shaped cross section on a longitudinal side of an opening provided on an upper surface thereof. When fitted, the top opening of the block can be closed.

[0003] Concrete blocks are formed using a welded formwork, but due to the structure of the formwork and the properties of the concrete block product, it is impossible to achieve 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 to generate noise due to a dimensional error between the joint surface on the cover side and the joint surface on the main body block side.

As means for preventing this noise, a structure in which a rubber sheet is attached to the joint between the cover plate and the main body block, or a structure in which the joint surface between the cover plate and the main body block is an inclined surface (Japanese Utility Model Application Laid-Open No. 63-18590). And a structure in which the joint surface between the cover plate and the main body block is formed into a curved surface that is geometrically similar to each other (see Japanese Patent Application Laid-Open No. 6-248688).

[0005] It should be noted that the lid plate of this type of concrete block has a structure in which both opposing sides parallel to each other are supported by the main body block side, and there is a shape error in the torsional direction of the lid plate and the joining of the main body block. Due to an error in the height direction of the surface, one corner of the lid plate floats when the lid plate is placed on the main body block, and when a load is applied to the floated portion due to the passage of a car or the like, the lid plate is lifted. It produces rattling noise.

[0006]

The structure in which a rubber member is provided on the joint surface between the cover plate and the main body block is relatively frequently employed, but has a problem of durability such as wear and deterioration. If the joint surface between the lid plate and the main body block is an inclined surface with the same inclination angle or a curved surface with a geometrically identical cross-sectional shape, it is assumed that both joint surfaces are in surface contact. High precision is required for the shape and dimensions of the mold, especially in the case of a structure with a curved joining surface, the radius of curvature and the positional accuracy of the center of curvature must be controlled when manufacturing the mold. Difficult to do.

[0007] In view of the above-mentioned problems of the various conventional structures, the present invention provides a self-aligning lid plate even if there is some error between the shapes of the joint surfaces between the lid plate and the main body block. When placed on the main body block in a state, the backlash of the joint surface is absorbed, so that it is possible to obtain a concrete block with a cover plate that does not generate noise without increasing the precision of the formwork so much. The challenge is to

[0008]

According to the first aspect of the present invention, there is provided a concrete block provided with a cover plate, wherein one of the mutual joining surfaces 9, 14 of the cover plate 3 and the main body block 2 is formed of a concrete block. It is a plane inclined in a direction symmetrical with respect to the center line P, and the other 14 is a V-shaped cross section having a shallow angle ridge projecting toward the one joint surface 9. .

According to a second aspect of the present invention, in the concrete block provided with the lid plate according to the first aspect, the main body block 2 is a groove block, and the main body side joint surface 14 for supporting the lid plate 3 of the groove block is formed. A V-shaped cross section having a shallow ridge is provided.

[0010]

In the concrete block of the present invention, the joining surfaces 9, 14 of the cover plate 3 and the main body block 2 are in line contact with each other (actually, there is a line contact having a finite width due to deformation or buckling of the concrete surface). Is the basic form. One of the joint surfaces 9 is connected to the center line P of the concrete block.
The torsion of the cover plate 3 and the error in the height direction of the joint surface 9 of the main body block are automatically absorbed by the displacement of the cover plate in the left-right direction. The line contact state of the joint surface is ensured. Further, since one of the joining surfaces is a flat surface and the other is a ridge line having a shallow angle, an error in the inclination angle of the flat surface does not become an obstacle in securing a line contact state between the two joining surfaces.

Therefore, if only the linearity between the joining surfaces of the two blocks in the longitudinal direction is controlled, the main body block 2 can be controlled.
The lid plate 3 placed on the top is self-aligned, and the line contact state is maintained at both sides facing each other, so that the production of the mold and the precision control of the product become very easy, and There is a feature that the play of the plate can be prevented.

[0012] The above-described operation is achieved when one of the joints is formed as a ridge line having a V-shaped cross section, even if the vertex angle of the cross section of the ridge line or the member provided with the ridge line is inclined, the line between the ridge line and the plane. It is clear considering that the contact state is maintained.

Further, by making the ridgeline a ridgeline having a shallow angle, it is possible to reduce the substantial surface pressure at the joint portion, so that there is no problem in strength.

In the main body block according to the second aspect, the main body-side joining surface 14 supporting the cover plate 3 has a V-shaped line having a ridge line having a shallow angle.
Since the shape of the lid plate is a cross section, the shape of the lid plate can be made a simple structure, and the lid plate can be formed by a multi-cavity mold.

[0015]

FIG. 1 shows 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 cover plate 3 for closing the water channel 1.

The U-shaped groove block 2 forms a water channel 1 by a bottom portion and both side wall portions, and a water channel side ridge portion of the upper surface 6 of the side wall portion is cut in an inverted U-shaped cross section. Form an inner surface 8 having a draft angle and a joining surface 9 which extends downward from the lower edge of the inner surface so as to be inclined inward. The inner surface 8 and the joint surface 9 on both sides are aligned with the center line P of the U-shaped groove block 2.
Is symmetric with respect to

On the other hand, the cover plate 3 has a rectangular shape whose width is slightly smaller than the distance between the inner surfaces 8 of the side walls in plan view and whose length is usually one half to one quarter of the groove block. The cover plate 3 has a side surface 11 parallel to the inner surface 8 of the side wall portion, and the upper surface 12 and the lower surface 13 of the cover plate are parallel. A joining surface 1 having a V-shaped cross section facing obliquely outward between a side surface 11 and a lower surface 13 of the lid plate.
4 are formed. The thickness of the lid plate 3 is such that the upper surface 12 of the lid plate and the upper surface 6 of the U-shaped groove block are flush with each other when the bonding surface 14 comes into contact with the bonding surface 9 of the side wall portion.

FIGS. 2, 3, and 5 show a second embodiment of the present invention. The main body block 2 of the concrete block according to the second embodiment is a block of variable gradient type, and has a rectangular opening 1 closed at the center of its upper surface with two cover plates 3,3.
9 are provided. Both sides of the opening are cut out in a substantially letter-shaped cross section. The notch is formed with an inner surface 8 having a draft angle and a ridge line having a shallow angle which is entirely inclined in a direction in which the inner surface becomes lower inward from a lower edge of the inner surface. V-shaped cross section having The inner surface 8 and the joint surface 14 on both sides are symmetric with respect to the center line P of the main body block 2.

On the other hand, the cover plate 3 has a rectangular shape whose width is slightly smaller than the distance between the inner surfaces 8 of the side wall portions in plan view and whose length is half the length of the opening 19. The cover plate 3 has a side surface 11 parallel to the inner surface 8 of the opening 19, and the upper surface 12 and the lower surface 13 of the cover plate are parallel. The portion where the lower surface 13 and the side surface 11 continue
The lid-side joining surface 9 is a flat surface having an angle substantially equal to the overall inclination angle of the body-side joining surface 14 having a shallow V-shaped cross section.
In the longitudinal center of the side surface 11 of the cover plate 3, half of the difference between the distance between the inner surfaces 8 of the openings and the width of the cover plate 3 (when the cover plate 3 is placed exactly at the center of the opening 19, The protrusion 21 is provided with a protrusion amount smaller than the size of the gap 20 formed between the side 11 and the inner surface 8 of the opening.

The projections 21 suppress the parallel movement of the cover plate 3 in the width direction when the cover plate 3 is placed on the main body block 2. In the concrete block according to the present invention, the play of the cover plate 3 when there is an error between the main body-side joint surface 14 and the lid-side joint surface 9 is, as shown in FIG. The direction center Q is absorbed by being slightly inclined with respect to the center line R of the main body block in plan view. On the other hand, the parallel movement of the cover plate 3 in the width direction with respect to the main body block 2 only has a function of slightly tilting the upper surface of the cover plate 3 in the width direction, and does not directly contribute to the prevention of rattling. By providing a projection 21 for suppressing the widthwise movement at the center of the cover plate 3 (the protrusion 21 may be provided on the main body block side in some cases), it is possible to prevent the cover plate 3 from moving unnecessarily on the main body block 2. Can be prevented.

There are various types of molds for molding the main body block 2 and the cover plate 3. It is of course possible to form the lid plates one by one, but since it has a simple shape, a structure in which a plurality of lid plates are molded at once using a single-frame with a multi-cavity mold. Is widely used. Cover plate 3
When forming one by one, a structure like the first embodiment in which the lid-side joining surface 14 has a shallow V-shaped cross section is suitable, and when forming the lid plate 3 with a multi-cavity mold, the main body side is used. Joint surface 14
The structure as in the second embodiment having a shallow V-shaped cross section is suitable. A generally used U-shaped groove block (including a side groove block) has a structure in which one to four cover plates are provided in one main body block, so that the main body side joining surface 14 has a shallow V-shaped cross section. However, it is possible to reduce the formwork cost as a whole.

It is clear from the above description, especially the means for solving the problems and the description of the operation section, what kind of means the present invention has provided to solve what problems. In the following, some further embodiments will be described just in case.

In the third embodiment shown in FIG. 4, as in the first embodiment shown in FIG. 1, the cover plate-side joining surface 14 has a V-shaped cross section having a ridge line having a shallow angle, and the body-side joining surface 9 has This is an example of an inclined plane. In the third embodiment, the lid-side joining surface 1
One surface (the surface indicated by 14a in FIG. 1) forming the V-shaped cross section of FIG. 4 is the same as the lower surface 13 of the lid plate, and belongs to the same embodiment as the example of FIG.

FIGS. 6 and 7 show a fourth embodiment of the present invention. As is clear from the configuration and operation of the present invention, the joint surface between the cover plate 3 and the main body block 2 does not necessarily have to be formed integrally with the cover plate 3 or the main body block 2 and is not necessarily used. At that time, that is, when the cover plate is placed on the main body block, it is sufficient if they are substantially integrated. In the fourth embodiment shown in FIGS. 6 and 7, a joining surface forming member 26 having a V-shaped cross section of the slope 25 shown in FIG. 7 is adhered to the step surface 15 of the main body block having the conventional structure with a double-sided tape or the like. , The main body block 3 having the configuration shown in FIG. Such a joint surface forming member 26 can be formed of an aluminum casting, a machined stainless steel, a hard rubber, a synthetic resin, or the like. In the structure of the fourth embodiment, when the concrete block of the conventional structure is already installed, the joining surface forming member 26 is attached to the installed main body block.
And the present invention can be implemented by replacing only the cover plate 3.

FIG. 8 shows an example in which a cover plate made of a metal grid (called a grating) is used as the cover plate 3. In the example of FIG. 8, the joining surface 14 on the side of the main body block 2 is a joining surface having a V-shaped cross section at a shallow angle, while the cover plate 3 made of a metal grid has an inclined U-shaped section having an inclined lower surface. Are welded to form the lid-side joining surface 9 on the lower surface of the leg member. Even in the case of using a metal grid lid plate, it is needless to say that the lower surface of the leg member 27 of the lid plate can be formed in a V-shaped cross section by making the joint surface on the main body block side an inclined plane.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a first embodiment.

FIG. 2 is a plan view of a main part of a second embodiment.

FIG. 3 is a perspective view of a lid plate having a support surface parallel to the upper surface.

FIG. 4 is an enlarged view of a main part of the third embodiment.

FIG. 5 is an enlarged view of a main part of the second embodiment.

FIG. 6 is an enlarged view of a main part of the fourth embodiment.

FIG. 7 is a perspective view of a joining surface forming member according to a fourth embodiment.

FIG. 8 is an enlarged view of a main part of the fifth embodiment.

[Explanation of symbols]

 2 U-shaped groove block 3 Cover plate 9 Inclined flat joint surface 11 Side surface of cover plate 14 Joint surface of V-shaped cross section 20 Gap 21 Projection P Center line of main body block

Claims (2)

[Claims] 1. One of the mutual joining surfaces (9, 14) of the cover plate (3) and the main body block (2) is inclined in a direction symmetrical with respect to the center line (P) of the concrete block. Plane, on the other hand
(14) A concrete block provided with a cover plate, wherein the concrete block has a V-shaped cross section having a shallow ridge protruding toward the one joining surface (9). 2. The main body block (2) is a groove block,
Body side joining surface (14) supporting lid plate (3) of this groove block
2. A concrete block provided with a cover plate according to claim 1, wherein the main body block has a V-shaped cross section having a shallow ridge.