JPH06104976B2 - Concrete block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to large-sized retaining wall blocks, drainage channel blocks, fence ditch channel blocks, box culverts, etc., which are used when making retaining walls, drainage channels, drainage tunnels, etc. The present invention relates to a concrete block that is well installed.

[Conventional technology]

Conventionally, for example, when constructing a retaining wall block, this retaining wall block is lowered onto a base (foundation with crushed foundation stones) with a truck crane, etc. After arranging them side by side with the blocks, the right and left side edge parts of the retaining wall plates are correctly butted together, but since the base is not necessarily flat, the right and left side edges of the respective retaining wall plates are correctly butted together. It was extremely difficult to arrange them in one row because it was more difficult to handle than large concrete blocks.

Therefore, the retaining wall block is lifted with a truck crane, etc. every time the construction is performed, an intervening object is interposed between the base and the bottom wall, and the crane is operated to push the large concrete block to correctly abut the side edges and the retaining wall. Although the front of the board has been corrected so that it is flush with the surface, the work is very troublesome and there is a drawback that the work efficiency is reduced.

[Problems to be Solved by the Invention]

The present invention solves such a drawback, and the concrete block is rocked or slid by using the fulcrum projection as a fulcrum without pushing the concrete block while operating the crane. It is a technical problem to provide a concrete block that can be easily placed in a predetermined position and can be properly and easily fixed on the base by filling the space between the bottom surface of the bottom wall and the base by holding the correct posture.

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

A fulcrum protrusion 2 is provided on the lower surface 1 ′ of the bottom wall 1 of the block a in the center of gravity of the block a or in the vicinity of the center of gravity so as to project downward, and a plurality of postures are provided at positions apart from the fulcrum protrusion 2. A nut 1 provided with a holding bolt 10 on the bottom wall 1 of the block body a
The present invention relates to a concrete block characterized in that the lower end of the posture holding bolt 10 is screwed in and out from the lower surface 1'of the bottom wall 1 so as to be vertically adjustable via 0 '.

[Action]

An example of the retaining wall block will be described. The block body a is placed on the base 3 by a truck crane or the like and the retaining wall plate 4 is used.
The right and left side end portions 4a are hung so that they can be correctly abutted with each other and the front and rear positions are aligned with a predetermined position.

At this time, when the block body a is slightly displaced from the predetermined position, the block body a is slightly raised above the base 3 with the fulcrum protrusion 2 projectingly formed on the lower surface 1 ′ of the bottom wall 1 serving as a fulcrum. Since the lower surface 1'of the bottom wall 1 is mounted on the base 3 more easily than the case where the lower surface 1'of the bottom wall 1 is exactly mounted on the base 3.

Therefore, it is possible to easily correct the heavy and large concrete block to the correct position and the correct state at all times.

For example, it is easy to align the front surface of the retaining wall plate 4 flush with the correct inclination state, or to align the left and right with the adjacent block body a.

In this state, for example, when the four posture holding bolts 10 arranged at the four corners are moved up and down and the lower ends are brought into contact with the base 3, the correct posture is maintained, and the base 3 and the lower surface 1'of the bottom wall 1 are held.
Block concrete a can be correctly fixed on the base 3 by stuffing concrete into the gap 12 between the block a and the base.

〔Example〕

The drawing shows an example of a preferred embodiment in which the present invention is applied to a large retaining wall block. A fulcrum protrusion is provided on the bottom surface 1 ′ of the bottom wall 1 of the block body a at or near the center of gravity of the block body a. 2 is provided so as to project downward, and a plurality of posture holding bolts 10 are provided at positions apart from the fulcrum projection 2 via the nuts 10 'provided on the bottom wall 1 of the block body a. Is provided so that the lower end thereof can be screwed in and out from the lower surface 1'of the bottom wall 1 so as to be vertically adjustable.

The block body a in the drawing has two retaining walls 5 integrally provided at the back of the retaining wall plate 4 and integrally connecting projection walls 6 at the left and right end portions 4a of the retaining wall plate 4, and also has a rectangular horizontal shape. A case where concrete injection holes 7 for pouring concrete into the gap 12 between the base 3 and the bottom wall 1 are drilled at several positions on the bottom wall 1 is illustrated.

The fulcrum protrusion 2 in the drawing is such that the bolt 9 is screwed from the bottom side to the nut plate 8 embedded in the bottom wall 1 and the head of the bolt 9 is used as the fulcrum protrusion 2 to adjust the degree of protrusion and the degree of oscillation. However, the structure is not limited to this, and the fulcrum projection 2 is integrally formed on the lower surface 1'of the bottom wall 1 in concrete molding as shown in FIG. The fulcrum protrusion 2 may be formed by projecting or by partially embedding a rod-shaped body such as a bolt in a projecting state as shown in FIG. In either case, it is desirable that the lower end of the fulcrum protrusion 2 be formed into a curved surface in order to facilitate the swinging and shearing movement of the block body a.

Further, as shown in FIG. 6, the posture holding bolt 10 has a nut 10 'embedded in a corner of the bottom wall 1 and the posture holding bolt 10 is screwed into the nut 10' in a penetrating state so that the block a is correctly mounted. When installed in the correct position, the posture holding bolts 10 at the corners are respectively screwed downward so that the lower end is brought into contact with the base 3 to hold the correct posture.

As a result of repeated tests by the applicant, it has been confirmed that the fulcrum projection 2 can exhibit a sufficient effect by projecting about 2 cm from the lower surface 1'of the bottom wall 1.

If the block body a is large, a plurality of fulcrum protrusions 2 may be provided in close proximity to each other instead of one, and the fulcrum protrusions 2 may be provided in a large gathered state near the center of gravity to withstand the load.

Reference numeral 11 in the figure is a form plate that closes a gap 12 between the lower surface 1 ′ of the bottom wall 1 and the base 3, and a gap closed by this form plate 11.
It is convenient in terms of work to pour concrete from the concrete injection hole 7 into the concrete 12, harden the concrete, fix the bottom wall 1 on the base 3, and then remove it.

〔The invention's effect〕

Since the present invention is configured as described above, for example, the retaining wall block is placed on the base, and the right and left end portions of the retaining wall plate are exactly abutted with each other, and the front surface of the retaining wall plate is in a correct position. And when installed side by side in the correct posture, the block body can be supported on the base only by the fulcrum protrusion.
You can swing it with a small amount of force, and you can also slide it with a small amount of force.

Therefore, it is also possible to properly join neighboring block bodies,
Also, it is possible to make the wall surface of the neighbors flush with each other, and it is possible to correct it extremely easily without using a truck crane or the like, and the degree of protrusion of the posture holding bolt below the bottom wall of the posture holding bolt apart from the fulcrum protrusion. It will be possible to easily maintain the correct posture by adjusting the amount, and then if concrete is filled in the gap between the bottom wall and the base, the block body is fixed on the base in the correct position and posture. It becomes a concrete block which is excellent in practicability and which is extremely improved in construction efficiency.

The present invention is particularly effective for large concrete blocks.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a perspective view of a block body, FIG. 2 is a side sectional view of the block body, FIG. 3 is a sectional view of a main part, and FIGS. Sectional view of essential part of another example, sixth
The figure is a cross-sectional view of another example of a state in which the posture holding bolt is screwed into the corner portion of the bottom wall. a: Block body, 1 ... bottom wall, 1 '... bottom surface, 2 ...
Support point protrusion, 10 ... posture holding bolt, 10 '... nut.

Claims (1)

[Claims] Claims: 1. A fulcrum projection is provided on a lower surface of a bottom wall of a block body so as to project downward at or near a center of gravity of the block body, and a plurality of posture holding bolts are provided at positions apart from the fulcrum projection. Is provided so that the lower end of the posture holding bolt is screwed in and out from the lower surface of the bottom wall through a nut provided on the bottom wall of the block body.