JP2001193142A - Concrete block with cover plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete block with a cover plate, preventing noises due to the rattling of the cover plate resulting from a molding error in a junction between the cover plate and a body block by placing the cover plate on the body block in the state of being automatically aligned even if there is some error between the junction planes of the cover plate and the body block. SOLUTION: One 9 of the junction planes 9, 14 of the cover plate 3 and the body block 2 is a plane inclined to the direction symmetrical with a center line P of the concrete block and the other 14 is a partially cylindrical face. The torsion of the cover plate 3 and the error of the junction plane of the body block in height are automatically absorbed by the shift of the cover plate from side to side. The junction planes at both sides are kept in a contacting condition even if there are errors in inclination at the side of the plane and the center or radius of curvature at the side of the cylindrical face.

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 main 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 by 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]

A concrete block provided with a cover plate according to the present invention comprises a cover plate 3 and a main body block 2.
One of the joint surfaces 9 and 14 is a plane inclined in a direction symmetrical with respect to the center line P of the concrete block, and the other 14 is a partially cylindrical curved surface. When the center Q is inclined with respect to the center line R of the main body block in a plan view, an error between the main body side joining surface and the lid side joining surface is absorbed.

The cover plate of the concrete block of the present invention has a projection smaller than the gap 20 formed between the main body block 2 at the longitudinal center of the side surface 11 on the side where the joint surfaces 14, 9 with the main body block 2 are provided. It can be provided with a quantity of protrusions 21. Also, instead of providing the above-mentioned projection on the lid plate, the joining surface 9 of the main body block with the lid plate 2,
At the center in the longitudinal direction of the inner surface 8 of the opening on the side provided with 14, a projecting portion having a projecting amount smaller than the gap 20 formed with the cover plate 3 can be provided.

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. It is characterized by having a partially cylindrical curved surface.

[0011]

The concrete block of the present invention has a basic form in which the joint surfaces 9, 14 of the cover plate 3 and the main body block 2 are in contact with each other on a cylindrical surface and a flat surface. Since one of the joint surfaces 9 is an inclined surface inclined in a direction symmetrical with respect to the center line P of the concrete block, the twist of the cover plate 3 and the error in the height direction of the joint surface 9 of the main body block are reduced. Is automatically absorbed by the left-right deviation of the cylinder, and the contact state between the cylindrical surface and the flat surface is ensured. Also, since one of the joining surfaces is a flat surface and the other is a cylindrical surface, errors in the inclination angle of the flat surface and the center of curvature and the radius of curvature of the cylindrical surface are caused when securing the contact state between the two joining surfaces. No obstacles.

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.
Since the lid plate 3 placed on top is self-aligned, the production of the formwork and the accuracy control of the product are very easy, and the lid plate 3 can be prevented from rattling.

[0013] The above operation is, when the cylinder is placed on a plane,
Whatever the radius of curvature of the cylinder, no matter what orientation the cylinder is placed in, even if the cylinder is rolled,
Furthermore, even if the cylinder is a cone, it can be clearly understood from the fact that the contact between the cylinder surface and the plane does not change.

Further, by increasing the radius of curvature of the cylinder, it is possible to reduce the substantial surface pressure at the joint, so that there is no problem in strength.

The lateral movement of the cover plate 3 in the width direction can be suppressed by providing the protrusions 21 having a protrusion amount smaller than the gap 20 formed between the cover plate and the main body block on the side surface 11 of the cover plate. This effect can also be achieved by providing the protrusion at the longitudinal center of the inner surface 8 of the opening of the main body block.

In the main body block according to the second aspect, since the main body side joining surface 14 for supporting the lid plate 3 is a partially cylindrical curved surface, the shape of the lid plate can be made simple, and the lid plate can be made simple. It is possible to mold with a multi-cavity mold.

[0017]

FIG. 1 and FIG. 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 pair of lid plates 3 closing the water channel 1.

The U-shaped groove block 2 has a bottom portion 4 and side wall portions 5.
The water channel 1 is formed by the above, the channel side ridge portion of the upper surface 6 of the side wall portion is cut in an inverted V-shape in cross section, and this notch is formed by an inner surface 8 having a draft angle and a lower edge of the inner surface. And a joining surface 9 extending downward and inclining from the inside. The inner surface 8 and the joining surface 9 on both sides are symmetric with respect to the center line P of the U-shaped groove block 2.

On the other hand, the cover plate 3 has a width slightly smaller than a distance between the inner surfaces 8 of the side wall portions in a plan view and a length which is usually one-half to one-fourth of the groove block. Is a rectangular shape having a half length. 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. The portion where the lower surface 13 and the side surface 11 continue
The joining surface 14 has a partially cylindrical shape. 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.

FIG. 3 shows a second embodiment of the present invention. The U-shaped groove block 2 of the present embodiment has a stepped surface 15 parallel to the upper surface 6, and a ridge 1 having a semicircular cross section at the center.
6 are provided. On the other hand, grooves 17 having an inverted V-shaped cross section are provided on both sides of the lower surface 13 of the cover plate 3. The space between the inverted V-shaped grooves 17 is slightly smaller than the space between the ridges 16, and when the cover plate 3 is placed on the U-shaped groove block 2, the V-shaped grooves 1 are formed.
The outer inclined surface 9 of 7 contacts the outer portion of the arc surface 14 of the ridge 16.

FIG. 4 shows a third embodiment of the present invention. In this embodiment, in the same structure as the second embodiment, the interval between the inverted V-shaped grooves 17 is provided slightly wider than the interval between the ridges 16, and the lid plate 3 is mounted on the U-shaped groove block 2. When placed, the inner inclined surface 9 of the inverted V-shaped groove 17 comes into contact with the inner portion of the arc surface 14 of the ridge 16. In such a contact state, the component force of the load applied to the cover plate 3 acts in the direction of expanding the side wall portion 5 of the block and is opposite to the direction of earth pressure around the block. Stress can be reduced. This is the same for the first and second embodiments.

FIG. 5 shows a fourth embodiment of the present invention. In this embodiment, the positional relationship between the ridge 16 and the V-groove 17 of the third embodiment is reversed, and the ridge 16 is provided on the cover plate side, and the V-shaped groove 17 is formed on the step of the U-shaped groove block 2. Face 15
It is provided in. The interval between the V-shaped grooves 17 is a ridge 16
When the cover plate 3 is placed on the U-shaped groove block 2, the arcuate surface 14 of the ridge 16 comes into contact with the outer inclined surface 9 of the V-shaped groove 17.

In the structure as in the second to fourth embodiments,
When the arc surface 14 of the ridge 16 is in contact with one inclined surface of the V-shaped groove 17, a gap 18 is formed between the other inclined surface of the V-shaped groove 17 and the ridge 16. However, if the dimension of the gap 18 is designed to be sufficient and sufficient to absorb the torsion of the cover plate 3 and the error in the height direction of the U-shaped groove block 2, the cover plate 3 is subjected to unexpected external force. Is shifted in the width direction, the shift width can be limited within the range of the gap 18, and the cover plate 3 can be prevented from being unnecessarily shifted.

FIGS. 6 to 8 show a fifth embodiment of the present invention. The main body block 2 of the concrete block according to the fifth embodiment is a variable gradient type block, and has a rectangular opening 19 closed at the center of its upper surface by two cover plates 3,3. 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 centrally convex partial cylinder which is entirely inclined in a direction in which the inner surface becomes lower inward from a lower edge of the inner surface. And a planar joining surface 14. The inner surface 8 and the joining surface 14 on both sides are the main body block 2.
Is symmetric with respect to the center line P.

On the other hand, the cover plate 3 has a rectangular shape whose width is slightly smaller than the interval 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 partially cylindrical main-body-side joining surface 14. 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, Side 11 and inner surface 8 of opening
Of the gap 20 formed between the projections 21).

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, the structure as in the first embodiment in which the lid-side joining surface 14 is a partially cylindrical surface is suitable. When the lid plate 3 is formed with a multi-piece mold, the main-body-side joining surface is used. A structure like the fifth embodiment in which the surface 14 is a partial cylindrical surface is suitable. A generally used U-shaped groove block (including a side groove block) has a structure in which two to four lid plates are provided in one main body block. The overall formwork cost can be reduced.

Incidentally, as shown in FIG.
Also in the cover plate 3 having the conventional structure parallel to the plate 2, the projection 21 for suppressing the movement in the width direction of the cover plate as a whole is provided at the center of the side surface longitudinal direction on the joint surface side, so that the position of the cover plate on the main body block. Can be reduced.

From the above description, particularly the means for solving the problems and the description of the operation section, it is clear what kind of means the present invention has and what the problems have been solved. In the following, some further embodiments will be described just in case.

The sixth embodiment shown in FIG. 10 belongs to the same embodiment as the fifth embodiment shown in FIG. 7, in which a flat surface in which the lid-side joint surface 9 is inclined and a body-side joint surface 14 are partially This is an example of a cylindrical curved surface, in which the partial cylindrical surface is provided between a step surface 15 formed by cutting off an inner upper edge of a main body block and an inner wall surface forming a water channel 1.

The seventh embodiment shown in FIG.
A partial cylindrical surface is provided at a ridgeline portion of the body-side joint surface formed in a shape.

FIGS. 12 and 13 show an eighth 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 eighth embodiment shown in FIGS. 12 and 13, a bonding surface forming member 26 having a slope 25 shown in FIG. 13 as a cylindrical surface 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. 7 is formed. Such a joint surface forming member 26 is made of aluminum casting, stainless steel cut, hard rubber,
It can be formed of a synthetic resin or the like. In the structure of the eighth embodiment, when the concrete block of the conventional structure is already installed, the joint surface forming member 26 is attached to the installed main body block, and only the cover plate 3 is replaced to implement the present invention. It is possible to

FIG. 14 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. 14, the joint surface 14 on the side of the main body block 2 is a partially cylindrical joint surface, while the lid plate 3 made of a metal grid is provided with a leg member having an inclined lower U-shaped section having an inclined lower surface. 27 is welded to form the lid-side joint surface 9 on the lower surface of the leg member. Even in the case of using a metal lattice lid plate, it is of course possible to make the joint surface on the body block side an inclined plane and make the lower surface of the leg member 27 of the lid plate a cylindrical surface.

[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 an enlarged view of a main part of the second embodiment.

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 fourth embodiment.

FIG. 6 is an exploded perspective view of a fifth embodiment.

FIG. 7 is an enlarged view of a main part of the fifth embodiment.

FIG. 8 is a plan view of a main part of a fifth embodiment.

FIG. 9 is a perspective view of a lid plate having a support surface parallel to the upper surface.

FIG. 10 is an enlarged view of a main part of the sixth embodiment.

FIG. 11 is an enlarged view of a main part of the seventh embodiment.

FIG. 12 is an enlarged view of a main part of the eighth embodiment.

FIG. 13 is a perspective view of a bonding surface forming member according to an eighth embodiment.

FIG. 14 is an enlarged view of a main part of the ninth embodiment.

[Explanation of Signs] 2 U-shaped groove block 3 Cover plate 9 Slant flat joint surface 11 Side surface of cover plate 14 Partially cylindrical joint surface 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 the center line of the concrete block.
(P) is a plane inclined in a symmetrical direction with respect to the other (1
4) is a partially cylindrical curved surface, which is the longitudinal center of the lid plate (3).
(Q) is inclined in plan view with respect to the center line (R) of the main body block, thereby absorbing an error between the main body side joining surface and the lid side joining surface. Equipped concrete block. 2. The main body block (2) is a groove block,
Body side joint surface (14) that supports the lid plate (3) of this groove block
2. The main body block of a concrete block provided with a cover plate according to claim 1, wherein is a partially cylindrical curved surface.