JP3184486B2 - Concrete block with lid plate - Google Patents

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]

According to the present invention, one of the 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. , and the Ru curved der of the other 14 partial cylindrical shape
By, Conch errors can be absorbed between the body-side bonding surface and the lid-side bonding surface by a longitudinal center Q of the cover plate 3 is obliquely in plan view with respect to the center line R of the main body block
It provides a particularly effective structure for the REIT block.
You.

According to the first aspect of the present invention, the amount of protrusion of the lid plate is smaller than the gap formed between the main body block and the side surface of the side surface on which the joining surfaces with the main body block are provided. Is provided. In addition, the main body block according to claim 2 has a projection smaller than the gap 20 formed between the lid plate 3 and the longitudinal center of the inner surface 8 of the opening provided with the joint surfaces 9 and 14 with the lid plate 2. It is characterized by having an amount of protrusion.

[0010] The above structure is a body block 2 has a groove blocks, concrete blocks where the body side joining surface 14 for supporting the cover plate 3 of the groove block and partial cylindrical curved surface
Can be adopted.

[0011]

In the concrete block of the present invention in a preferred form, the joining surfaces 9 and 14 of the cover plate 3 and the main body block 2 are in line contact with each other (actually, line contact having a finite width due to deformation or buckling of the concrete surface). ) Do the basic form
Things. In such a concrete block, one of the joining surfaces 9 is an inclined surface which is inclined in a direction symmetrical with respect to the center line P of the concrete block.
And the error in the height direction of the joint surface 9 of the body block are automatically absorbed by the displacement of the cover plate in the left-right direction, and the line contact state of the joint surfaces on both sides is ensured. In addition, since one of the joining surfaces is a plane 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:
It does not become an obstacle when securing the line contact state of both joint 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.

[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 line contact with the flat surface can always be maintained.

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 cover plate according to the first aspect of the present invention is provided with a protrusion 21 having a protrusion amount smaller than a gap 20 formed between the side plate 11 and the main body block, so that the cover plate 3 can be moved in the width direction in parallel. Can be suppressed. This effect is achieved by claim 2
As described, connect the protrusion to the joint surface of the opening of the body block.
It can also be achieved by providing the inner surface 8 on the side provided with 9 and 14 at the center in the longitudinal direction.

The main body block 2 is a groove block.
And the body-side joining surface 1 supporting the lid plate 3 of the groove block.
The block having a partially cylindrical curved surface 4 can have a simple structure of the cover plate, and the cover plate can be formed by a multi-cavity mold.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a connector having a cover plate .
First joint between the cover plate of the concrete block and the main body block
3 shows a structural example . The concrete block of this structural example includes a U-shaped groove block 2 having a channel 1 and a channel 1.
And a pair of lid plates 3 for closing the lid.

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 quarter 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 joint structure between the cover plate and the main body block.
This is an example . U-shaped groove block 2 of this structural example
Is provided with a step surface 15 parallel to the upper surface 6, and a ridge 16 having a semicircular cross section is provided at the center thereof. On the other hand, cover plate 3
A groove 17 having an inverted V-shaped cross section is provided on both sides of the lower surface 13 of FIG. The space between the inverted V-shaped grooves 17 is slightly smaller than the space between the ridges 16. When the cover plate 3 is placed on the U-shaped groove block 2, the outer inclined surface 9 of the V-shaped groove 17 is It contacts the outer part of the arc surface 14.

FIG. 4 shows a third joint structure between the cover plate and the main body block.
This is an example. This structural example is the second bonding structural example
In the same structure as above, the interval between the inverted V-shaped grooves 17 is provided to be slightly wider than the interval between the ridges 16. When the cover plate 3 is placed on the U-shaped groove block 2, Groove 17
Contact the inner part 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 bonding structure example .

FIG. 5 shows a fourth joining structure of the cover plate and the main body block.
This is an example. In this structural example , the positional relationship between the ridge 16 and the V-groove 17 of the third joining structure is reversed, and the ridge 16 is provided on the cover plate side and the V-shaped groove 17 is formed in a U-shape. It is provided on the step surface 15 of the groove block 2. The space between the V-shaped grooves 17 is provided slightly smaller than the space between the ridges 16. When the cover plate 3 is placed on the U-shaped groove block 2, the arc surface 14 of the ridge 16 becomes a V-shaped groove. 17 contacts the outer inclined surface 9.

In a structure like the second to fourth joining structures , when the arc surface 14 of the ridge 16 is in contact with one inclined surface of the V-shaped groove 17, the V-shaped groove 17 A gap 18 is formed between the other inclined surface and the ridge 16, and the size of the gap 18 is determined by the twist of the cover plate 3 or the U-shaped groove block 2.
If the gap is designed to have a necessary and sufficient gap to absorb the error in the height direction, when the cover plate 3 is shifted in the width direction by an unexpected external force, the shift width is limited to the range of the gap 18. It is possible to prevent the cover plate 3 from shifting more than necessary.

FIGS. 6 to 8 show a first embodiment of the present invention. The main body block 2 of the concrete block of the first embodiment is a block of a variable gradient type, and has a rectangular opening 19 closed at the center of its upper surface by two cover plates 3,3. Both sides of this 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 the 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. At the center in the longitudinal direction of the side surface 11 of the cover plate 3, a 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. This
In the concrete block of the embodiment and each of the joining structure examples, the play of the cover plate 3 when there is an error between the main body side joining surface 14 and the lid side joining surface 9 is as shown in FIG. In addition, the absorption is made because the longitudinal center Q of the cover plate 3 is 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 bonding structure example in which the lid-side bonding surface 14 is partially cylindrical is suitable.
When molding with a multi-cavity mold, the body side joint surface 1
The structure as in the first embodiment in which 4 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.

As shown in the second embodiment of FIG.
Even in the cover plate 3 having the conventional structure in which the joining surface is parallel to the upper surface 12, the protrusion 21 for suppressing the movement of the entire cover plate in the width direction is provided at the center in the longitudinal direction of the side of the joining surface, so that Disorder in the posture of the cover plate 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. Hereinafter, some examples of the joint structure between the lid plate and the main body block will be described for the sake of clarity.

The fifth joining structure example shown in FIG. 10 belongs to a structure similar to that of the first embodiment shown in FIG. 7, and a flat surface in which the lid-side joining surface 9 is inclined and a body-side joining 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.

In the sixth joining structure example shown in FIG. 11, a partial cylindrical surface is provided at a ridge portion of the main body-side joining surface having a shallow V-shaped cross section.

FIGS. 12 and 13 show a seventh joining structure example . As is clear from the description of the above operation, the joint surface between the cover plate 3 and the main body block 2 is not necessarily formed integrally with the cover plate 3 or the main body block 2 and is not necessarily used. It suffices if the cover plate is placed on the main body block and is substantially integrated. In the seventh joining structure example shown in FIGS. 12 and 13, a joining surface forming member 26 having the inclined surface 25 shown in FIG. 13 as a cylindrical surface is adhered to the step surface 15 of the conventional body block 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. The structure of the seventh joining structure example is as follows.
When the concrete block of the conventional structure is already installed, the joining surface forming member 2 is attached to the installed main body block.
The attachment 6, the present invention by replacing only the cover plate 3
It is possible to realize a particularly preferable joining structure .

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 example of a joint structure between a cover plate and a main body block .

FIG. 2 is an enlarged view of a main part of a first bonding structure example .

FIG. 3 is an enlarged view of a main part of a second bonding structure example .

FIG. 4 is an enlarged view of a main part of a third joining structure example .

FIG. 5 is an enlarged view of a main part of a fourth bonding structure example .

FIG. 6 is an exploded perspective view of the first embodiment.

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

FIG. 8 is a plan view of a main part of the first embodiment.

FIG. 9 is a perspective view of a lid plate according to a second embodiment .

FIG. 10 is an enlarged view of a main part of a fifth bonding structure example .

FIG. 11 is an enlarged view of a main part of a sixth joining structure example .

FIG. 12 is an enlarged view of a main part of a seventh bonding structure example .

FIG. 13 is a perspective view of a bonding surface forming member of a seventh bonding structure example .

FIG. 14 is an enlarged view of a main part of the eighth joining structure example .

[Explanation of symbols]

 2 U-shaped groove block 3 Cover plate 9 Inclined 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)

(57) [Claims] 1. A gap (20) formed at a longitudinal center of a side surface (11) provided with a joint surface (14, 9) with a main body block (2). Small protrusions (2
A cover plate of a concrete block provided with a cover plate, which is provided with 1). 2. A gap (20) formed between the inner surface (8) of the opening provided with the joint surface (9, 14) and the lid plate (3) at the longitudinal center thereof. A) a main block of a concrete block with a lid plate, characterized in that it comprises a projection of a smaller projection.