JPS6037313A - Concrete block - Google Patents

Abstract

PURPOSE:To lessen damage to projections of a concrete block as well as improve the catching performance of the block by a method in which ridge lines are formed on the tops of a regular tetrahedron form by cutting off the flat and ridge portions of the block, two large recessions are formed in the ridge lines, and widewardly long recessions are formed on the other ridge lines. CONSTITUTION:A set of ridge lines not crossing each other and through holes 2 crossing each other are provided for a concrete block of regular tetrahedron form. The same sizes of faces in parallel with the bottom faces are cut off at each top of the regular tetrahedron to form flat faces A, B, C and D, and the acute angle portions of each ridge line of the regular tetrahedron are cut off to form ridge lines 1. Cut-in lines 4 are then formed by cutting the portion from the tops of two ridge lines 1 having through holes 2 to the adjacent faces of regular tetrahedron, and two large trapezoidal recessions 5 connecting the tips of the cut-in lines 4 in parallel with the edge lines 1 are formed. The other edge lines 1 are cut off at the centers into a trapezoidal form to form sidewardly long recessions 6. Projections 7 are provided to the tops of the faces 3 of regular tetrahedron to form a block.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concrete blocks used for wave-dissipating works in rivers, ports, etc.

Blocks used for wave dissipation works in rivers, ports, etc. (hereinafter simply referred to as "blocks") are designed to be easy to fit together, have an appropriate porosity, prevent members from breaking, and have high stability. Something expensive is desired. Special application No. 58-6427 of Showa
No. 1 was developed for this purpose, but in order to improve the mutual hooking of the blocks, patent application No. 58-9323 was applied.
No. 4 was developed. The present invention further improves these, improves the mutual catching of the blocks, facilitates the manufacture of the blocks, and reduces damage to the protrusions. This will be explained below using examples. FIG. 1 shows the first process in which the concrete block of the present invention (hereinafter simply referred to as the "main block") is formed. First, a set of parallel ridge lines of a regular tetrahedron], A cylinder 2 with a circular cross section is penetrated so as to be perpendicular to A ridgeline work is formed by connecting each point approximately xi from the end of the long side and cutting off the acute angle of each ridgeline, and on the top of the cool tetrahedron are hexagonal planes A, B, O,
D is in a molded state. In this case, the cross section of the cylinder is not limited to a circular shape, and may of course be square, hexagonal, or the like. Figure 2 shows the second process in which this block is molded, in which a large trapezoidal recess is formed in the ridgeline part with the through hole shown in Figure 1, and a horizontally elongated trapezoidal recess is formed in the center of the other ridgeline part. 04, which is a side view of the molded state, shows the through holes 2 extending parallel to the surface 3 of the regular tetrahedron in contact with the legs from two positions slightly inside the top of the ridgeline portion having the through holes.
(shown as a dotted line), tie its tip parallel to the ridgeline 1, cut off the ridgeline, and create two large trapezoidal recesses (the other one is in the shadow of the top C). (You can't see it because it looks like this) The other ridgeline portions are cut into a horizontally elongated trapezoidal shape at their central portions to form recesses 6. Figure 3 shows the side surface of the main block completed in the third process.
The block is completely molded with a slight protrusion about 5 to 0.2 times thicker. FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a perspective view of FIG. 3.

Since this block is formed in the shape of the toshi described above, it remains in the same state no matter which way it rolls, has a low center of gravity, and has good stability. Also, the tip of this block is V-shaped when viewed from either direction, with two sections rigidly connected, so for example, when an external force is applied to the apex of this block,
Since the force is distributed between the two members, it is very important from a mechanical point of view. On the other hand, conventional general blocks have protrusions that protrude in an angular shape, so they have to resist external force with a single breakage, which makes them prone to breakage. Furthermore, this block has four large trapezoidal parts 5 cut out from the ridgeline and a concave part 6 cut out into a horizontally long trapezoidal shape from the center of the other ridgeline. The major difference here from Japanese Patent Application No. 58-93234 is that there is no claw-like protrusion 2 shown in FIGS. 2 to 4 of that patent application. The claw-like protrusions 2 are used to better secure the blocks together, but on the other hand, such small protrusions make the formwork that much more complicated, and furthermore, during the block manufacturing process, the concrete cannot be sufficiently circulated to the corners of the crock. This has the disadvantage that the strength is reduced and it is easy to break. In order to prevent this, a great deal of effort was required to produce the blocks. Because this block does not have such protrusions, it is easy to manufacture, and even when stacking a large number of blocks in an orderly manner or randomly, the top (cut ends A, B, G, etc.) D) are easy to fit into the large recesses 5 of other book blocks, and 5 has a large opening facing outward and a deep English patent application No. 58-6.
When scraping a large number of blocks of No. 427γ and No. 58-93234, when the surface corresponding to surface 3 of this block comes into contact with the surface, the blocks cannot be locked together because there is no convex part, and the blocks are mutually separated. The disadvantage was that it was easy to slide.

On the other hand, this block has a slight protrusion so that the blocks lock each other, eliminating the drawback of easy sliding. If the protrusion is too thick, not only will the top of the block not be able to fit into the recess 5, but if a large protrusion is attached to the top, the protrusion will easily break. The slightly convex part 7 of this block eliminates the above-mentioned drawbacks and brings out the advantages of the convex part.
, the blocks fit or lock each other and do not easily collapse in any stacked state. Even when viewed as a single unit, the center of gravity is low, and there is a through hole 2 in the concave part 5, which is easily affected by waves, so for example, when waves act from the left in Fig. 2, it is difficult to topple the block. However, when a large amount of waves pass through the through hole 2, and when waves act from the right, an uplift force will be applied to this block, but in this case too, a large amount of waves will pass through the through hole 2. Not only is the external force acting on this block greatly reduced, but the waves that pass through the through holes disturb the entire wave, so when many blocks are stacked, the wave dissipation effect is still zero.

[Brief explanation of drawings]

Figure 1: Diagram of the first forming process of the φ main block, Figure 2...
- Side view of the second forming process, Fig. 3 - Side view of the zero block, Fig. 4 - Plan view, Fig. 5 - Enlarged perspective view. 1... Ridge line, 1... Ridge line part, 2... Through hole,
3... Surface, 4... Cut line, 5.6... Concave, 7@... Convex. A, B, O, D-@Kirishiro at the top of the fist. Patent applicant: Ken Ishikura 5 Kasumi

Claims (1)

[Claims] A cylinder whose cross section is square, hexagonal, or circular is passed through so as to be orthogonal to a pair of parallel ridge lines of a regular tetrahedron, and each top of the regular tetrahedron is connected to a bottom surface that is mutually null. Cut to the same size on parallel planes, measure from the end of the side length of the equilateral triangle at the opening, connect the points of , cut the acute angles of each ridgeline, and make the ridgeline part with a through hole. Cut υ from two positions slightly inside from the top to the vicinity of the through hole parallel to the surface 3 of the adjacent regular tetrahedron, tie the end of the cut in parallel to the ridgeline part, and then cut the ridgeline part. Cut out and form two large trapezoidal concave parts, and cut the other ridgeline parts into horizontally elongated trapezoidal shapes at their center parts, and then form 3 sides of the original tetrahedron.
A concrete block characterized by a slight convexity on the top surface.