JPH0822530B2 - Molding method for concrete block such as fish reef - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for molding a concrete block such as a fish reef having an internal space and a communication hole for communicating the internal space with the outside.

(Prior art) Recently, an artificial fish reef was installed in the sea, and algae were added to this fish reef.
Rooting of seaweed, etc. is being carried out to increase the resources of fish and shellfish.

There are many types of fish reefs, such as fish reefs, shellfish reefs, and shrimp fish reefs, but these fish reefs usually have an internal space and a large number of communication holes that connect this internal space to the outside. Through this communication hole, fish, shellfish, etc. can enter the inner space and live there.

(Problems to be Solved by the Invention) By the way, when the fish reef is to be molded from concrete, there are the following disadvantages.

(1) The fish reef to be formed is one large block, for example, a cube having a side length of 4 m, and as described above, it has an internal space and a large number of communication holes. ing. Therefore, the mold for the fish reef to be molded has a complicated space inside. Therefore, when concrete is poured into this space, the concrete may not be sufficiently poured into each part of the space.

Therefore, conventionally, in order to ensure the filling of this concrete, it has been practiced to add sufficient water to this concrete to provide sufficient fluidity. However, in this case, there is an inconvenience that the setting time of the concrete becomes long, that is, the molding time becomes long.

(2) When the cross-sectional area of the internal space is larger than the cross-sectional area of the communication hole, if the fish reef is to be integrally formed as one block, the die-cutting work of the internal space becomes extremely complicated. Therefore, conventionally, the fish reef is composed of a plurality of blocks, these are individually molded, and then these blocks are joined together. However, in this case, in addition to the forming work of each block, a work for connecting these blocks is required, and thus the forming work of the fish reef is complicated accordingly.

(Object of the Invention) The present invention has been made by paying attention to the above circumstances, and in the case where a concrete block to be molded is relatively large and has an internal space and a large number of communication holes. Even if there is, it is an object of the present invention to enable the molding work of this concrete block in a short time and easily.

(Structure of the Invention) A feature of the present invention in order to achieve the above object is a method for molding a concrete block having an internal space and a large number of communication holes for communicating the internal space with the outside, Place the lower step outer frame corresponding to the general surface of the side outer peripheral surface of the lower step of the concrete block to be formed on the work surface, and cut the die so as to correspond to the internal space and the communication hole in the upper and lower steps. Arranged in the lower part outer frame, then filling the space in the lower part outer frame with concrete to solidify it, and then removing the die and collapsible filler into the cavity after the die is removed. Then, the upper step outer frame corresponding to the general surface of the side outer peripheral surface in the upper step part of the concrete block is placed on the lower step outer frame, and the concrete is placed in the space in the upper step outer frame. It is in the point of filling and solidifying.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, 1 is a concrete fish reef, and this fish reef 1 shows an example of a concrete block to be molded. First, the structure of the fish reef 1 will be described in detail. The fish reef 1 has a rectangular parallelepiped shape as a whole, and has a rectangular parallelepiped internal space 2 and a plurality of lower communication holes 3 for communicating the internal space 2 with the outside. It has an upper communication hole 4. Each of the communication holes 3 and 4 has a rectangular cross section, and its cross-sectional area is smaller than that of the internal space 2. In addition, a recess 5 is formed in each of the corners on the outer side surface of the fish reef 1 in the middle of the vertical direction.

 Next, a method for forming the fish reef 1 will be described.

In FIG. 4, first, the fish reef 1 to be formed.
Is geometrically divided into upper and lower stages, and each of the sections is formed from the bottom to a lowermost step portion 15, a lower intermediate portion 16, a central portion 17, an upper intermediate portion 18, and an uppermost portion 19. In this case, the joint surface between the sections passes through the upper and lower surfaces of the lower communication hole 3 and the upper communication hole 4 in order to facilitate the die-cutting work as described later.

In FIG. 5, in the first step, the outermost frame 21 of the lowermost step portion corresponding to the general outer surface of the side portion of the lowermost step portion 15 is attached to the work surface.
It is placed on top of this, and concrete 23 is filled in the outermost frame 21 of the lowermost part. When the concrete 23 is solidified to some extent, the work of the next step is performed.

Since the lowermost step 15 has a flat shape, when the concrete 23 is poured into it, the concrete
Even if 23 does not have sufficient fluidity, this concrete 23 is sufficiently filled into every corner of the lowermost step portion 15. Therefore, since the concrete 23 is not required to have high fluidity, its water content is reduced, and the concrete 23 contains a solidification accelerator.

Therefore, if the lowermost outer frame 21 is filled with concrete 23, the solidification proceeds rapidly, and the concrete 23 is solidified in an extremely short time. Concrete 23 below
This is also the same as the above, and the water content is suppressed to a low level and a solidification accelerator is mixed.

In FIG. 6, as a second step, a lower intermediate portion outer frame 25 corresponding to the general outer peripheral surface of the lower intermediate portion 16 is placed on the lowermost step outer frame 21 so as to be superposed. In this case, since the lower middle part 16 includes the lower part of the internal space 2, the lower middle part outer frame 25 is provided with the first punching die 26 corresponding to the lower part of the inner space 2 in the lower part of the inner space 2. Is placed at the position to be molded.

Further, since the upper and lower midway portions 16 also include the lower communication holes 3, the second punching die 27 having a shape corresponding to each of the lower communication holes 3 is formed in the upper and lower midway outer frame 25. The hole 3 is arranged at the position to be molded. Then, the space in the lower middle part outer frame 25 is filled with concrete 23.

In the above case, the upper surface of the concrete 23 filled in the outermost frame 21 of the lowermost portion is roughened in advance. Therefore, the concrete 23 in the outermost frame 21 of the lowermost step and the concrete 23 solidified in the outer frame 25 of the lower middle portion are firmly bonded and integrated.

In FIG. 7, as a third step, as shown by an arrow A in the drawing, each of the cutting dies 26 and 27 is pulled out from the inside of the lower middle portion outer frame 25. And the cavity after the removal
Insert dry sand 29 as a filler into 28 and lightly tamper it.

In FIG. 8, as a fourth step, a central outer frame 31 corresponding to the general outer peripheral surface of the central portion 17 is placed on the lower midway outer frame 25 so as to be superposed. In this case, since the central portion 17 includes the vertical midway portion of the internal space 2, the third punching die 32 corresponding to the vertical midway portion of the internal space 2 is provided in the central outer frame 31 of the internal space 2 as above. The upper and lower midway portions are arranged at the positions to be molded.

Also, since the central portion 17 includes the recess 5, the fourth punching die corresponding to the recess 5 in the outer frame 31 of the central portion.
33 is placed at the position where the recess 5 is to be formed. And
The space inside the central outer frame 31 is filled with concrete 23. In this case, since the sand 29 is inserted into the cavity 28 formed in the lower middle part outer frame 25, the concrete 23 is prevented from flowing into the cavity 28.

The relationship between the lower midway portion 16 and the central portion 17 in the fourth step is that the lower midway portion 16 is the lower step portion, while the central portion 17 is the lower step portion.
Is the upper step portion, and therefore, the lower middle part outer frame 25 is the lower step outer frame, and the central outer frame 31 is the upper step outer frame.

In FIG. 9, as the fifth step, the above concrete is used.
If 23 solidifies to some extent, like the third step,
The third punching die 32 and the fourth punching die 33 as shown by an arrow A in the drawing are pulled out from the inside of the central outer frame 31. Then, each hollow portion 34 after the removal is filled with sand 29.

In FIG. 10, as the sixth step, as in the second step and the third step, on the central part outer frame 31 corresponding to the central part 17 and the upper middle part outer frame corresponding to the upper middle part 18. 35 is placed, and concrete 23 and sand 29 are filled in the upper middle part outer frame 35 using the first and second cutting dies 26 and 27.

The relationship between the central portion 17 and the upper middle portion 18 in the sixth step is that the central portion 17 is the lower step portion, whereas the upper middle portion 18 is the upper step portion thereof. The outer frame of the lower part becomes the outer frame, and the outer frame 35 of the upper middle part becomes the outer frame of the upper part.

As shown in FIG. 10 above, as the seventh step, the uppermost step outer frame 36 is placed so as to be superposed on the upper middle step outer frame 35, and the concrete 23 is filled in the uppermost step outer frame 36.

Then, as the final step, if the concrete 23 in the uppermost step outer frame 36 is solidified, each outer frame 21, 25, 31, 35, 36 is removed, and then the sand 29 filled in each cavity 28, 33 is removed. And remove it. Then, the fish reef 1 as shown in FIGS. 1 to 4 is formed.

In the above case, each outer frame can be easily removed by decreasing or increasing the inner dimension of each outer frame from the bottom to the top and further providing each outer frame with a draft.

Further, as shown in FIG. 11, if each drafting die 26, 27, 32, 33 is provided with a draft on the outer periphery of the side surface, the pulling out work can be facilitated. Also, a hook latch 37 for the hoist used when arranging and removing the cutting dies 26, 27, 32, 33.
If the above-mentioned cutting dies are provided, the above-mentioned respective works will be easier.

Furthermore, if the heights of the lower midway portion 16 and the upper midway portion 18 are the same as those of the central portion 17 and the second punching die 27 and the fourth punching die 33 have the same shape, they can be used together. Becomes
Further, the second punching die 27 and the fourth punching die 33 may be combined to form the first punching die 26 and the third punching die 32. In this case, the types of the shapes of the punching die can be reduced as much as possible. .

Further, in the final step described above, the fish reef 1 may be one in which the hollows 28 and 34 are filled with the sand 29. In this case, when the fish reef 1 is submerged in the sea, the sand 29 is gradually collapsed by the waves and eventually becomes the fish reef 1 shown in FIGS. 1 to 4.

Further, another example of the filler will be described.
In addition to sand as described above, this filler includes water (including seawater,
The same shall apply hereinafter), or noodles that are physically or biologically disintegrated by microorganisms in water. Further, the filler may be an adhesive, water glass or the like which is chemically disintegrated by water (including the meaning of dissolution).

(Effect of the Invention) According to the present invention, when a concrete block is to be formed, first, the lower step portion is concrete-formed, and then the upper step portion is concrete-formed by being piled up. At this time, the filler is inserted into the cavity of the lower step so that the concrete of the upper step does not flow into the cavity formed in the lower step. Since this filler can be collapsed, if the filler is removed by this collapse, the desired concrete block will be finally obtained.

In the above case, since the lower step and the upper step are part of the shape of the concrete block, each outer frame for each of these steps,
The space formed between the die and the die arranged in the outer frame has a simple shape. Therefore, the concrete to be poured into these is not required to have a large fluidity, so that the water content thereof can be suppressed to a low level and a strong solidification accelerator can be used. Therefore, the concrete block can be molded in a short time.

Further, since the internal space of the concrete block is formed by inserting the filler into the concrete and removing the filler after solidification of the concrete, the concrete block to be obtained is formed as one piece. be able to. Therefore, in order to facilitate the die-cutting, conventionally, the concrete block is composed of a plurality of blocks, and after these are individually molded, these blocks are bonded to each other as compared with the concrete block molding work. Becomes extremely easy.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a perspective view of a fish reef,
Figure 2 is a partial plan view of a fish reef, and Figure 3 is III- in Figure 1.
Sectional view taken along the line III, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1, and FIG. 5 to FIG. 10 are perspective views sequentially showing the method for forming fish reef, and FIG. It is a side view. 1 ... Fish reef (concrete block), 2 ... Internal space, 3 ... Lower communication hole, 4 ... Upper communication hole, 16 ... Lower middle part (lower part), 17 ... Central part (upper part), 23 …… Concrete, 25 …… Lower middle part outer frame (lower part outer frame), 26 ……
1st die, 27 …… 2nd die, 28 …… cavity, 29 ……
Sand (filler), 31 …… Central outer frame (upper outer frame), 32…
… 3rd punching die, 33 …… 4th punching die, 34 …… cavity, 35…
… Upper middle part outer frame.

Claims (1)

[Claims] 1. A method of molding a concrete block having an internal space and a large number of communication holes for communicating the internal space to the outside, which comprises first forming a side outer peripheral surface of a lower step portion of the concrete block to be molded. Place the lower part outer frame corresponding to the general surface on the work surface, place the die in the lower part outer frame so as to correspond to the internal space and the communication hole in the upper and lower part, and then to the lower part. The space in the outer frame is filled with concrete to solidify it, and then the punching die is removed and a collapsible filler is inserted into the cavity after the extraction, and then the side of the concrete block at the upper step A method for forming a concrete block such as a fish reef in which an upper step outer frame corresponding to the general outer peripheral surface is placed on the lower step outer frame and the space in the upper step outer frame is filled with concrete and solidified.