JPS6338486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to concrete blocks for seawalls of rivers, ports, etc., and a method of constructing seawalls using the concrete blocks.

``Conventional technology and its problems'' In narrow rivers, blocks are often piled up about 5 minutes apart on the slope of the bank. However, in areas where rapids flow, there are no suitable large stacking blocks, so conventionally large blocks for wave-dissipating root consolidation have been used instead. However, since the original purpose of these blocks was to dissipate waves, the gaps between the blocks were too large, and the backfilling material and earth and sand from the back of the seawall leaked, causing the buried soil to cave in. In addition, curved sections require irregularly shaped blocks, making construction difficult especially in areas with a small radius of curvature, which is the biggest factor in increasing construction costs.

``Object of the Invention'' The object of the present invention is to provide a concrete block for a bank revetment that can be easily and stably connected and piled up and has a good revetment effect and a force reducing effect against flowing water, and a concrete block with a radius of curvature using the same. To provide a method for constructing a seawall that can efficiently construct a seawall even for small areas.

"Means for solving the problem" The concrete block for seawall according to the present invention has the following features:
A trapezoidal recess is formed in the middle part of both the upper and lower surfaces of the rectangular parallelepiped, and the upper and lower edges of the front and rear ends of the rectangular parallelepiped are chamfered to form trapezoidal upper and lower convex parts on both the front and rear sides of the recess. In addition, a projection for maintaining the distance is integrally provided in the middle part of at least one of the left and right sides, and a small through hole for inserting the iron rod is provided from the center of the projection to the opposite surface, and on both the front and rear sides thereof, A large through hole is provided that passes through both left and right side surfaces of the rectangular parallelepiped.

In addition, the method for constructing a seawall according to the present invention further uses a large number of concrete blocks with the tip of the projection having a corrugated surface, and connects the corrugated tip surface of each projection with a plurality of concrete blocks as one unit. After connecting the concrete blocks by inserting iron rods into the matching small through holes, the multiple sets of connected concrete blocks are fitted with their upper and lower recesses and protrusions, and then filled with backing material. They are stacked in multiple tiers while doing so.

``Function'' By inserting an iron rod into the small through hole, blocks can be connected to each other in any desired number by maintaining a constant distance from each other by the protrusions.
The concrete connected bodies connected in this manner can be stacked with their respective trapezoidal upper and lower concave portions and convex portions interlocking with each other so as to be staggered in the front and back. Since gaps are formed between the blocks by the protrusions, the force of flowing water can be reduced in the gaps. Moreover, since there are large through-holes that penetrate from side to side on both sides of the protrusion, waves that enter the gap further pass through these through-holes.
Kills are reduced more effectively.

In the method of the present invention, the required number of connected concrete blocks are stacked as described above, so construction can be carried out efficiently. In addition, we use a large number of blocks with the tips of the protrusions mentioned above as wavy surfaces,
In order to match and connect their corrugated surfaces, the blocks can also be installed in a meandering manner as a whole.

"Embodiments" The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 1 is a side view of one concrete block (hereinafter referred to as the main block) 1 according to the present invention.
FIG. 2 is a plan view thereof. This block 1 is a nearly rectangular parallelepiped that is long from front to back, and in the middle of both the top and bottom sides,
Trapezoidal upper and lower recesses 2 having a size of approximately one-third of the length of the rectangle are provided, and chamfered sides 3 are chamfered along the upper and lower edges of the rectangle at both front and rear ends of the rectangle. The four parts between the chamfered sides 3 at these four corners and the upper and lower recesses 2 are then
The trapezoidal convex portion 4 is large enough to fit into the concave portion 2 of the present invention. Further, protrusions 5 having a length of approximately one-fourth of the thickness of the rectangular parallelepiped and having a height extending between the bottom surfaces 2a of the upper and lower recesses 2 are integrally provided on both left and right sides of the rectangular parallelepiped. .

These protrusions 5 have a width that is approximately the same as the width of the bottom surface 2a of the recess 2, and gradually taper toward the tip from the base end, and the tip surface 5a has a gentle S shape from the front edge to the rear edge. It has a wavy surface that draws a letter shape. As shown in FIG. 3, the S-shape is oriented in opposite directions on the left and right in order to engage with the tip end surface 5a of another block 1. In this case, if the front and rear ends of the distal end surfaces 5a do not coincide with each other and a slight gap 6 is formed between them, they can be connected to each other with flexibility in bending.

In order to connect the blocks 1 to each other with an iron rod, a nut hole 7 is provided at the center of the left and right protrusions 5, and a small through hole 8 for inserting the iron rod is provided between the centers of the left and right nut holes 7. Further, two large through holes 9 are provided on both the front and rear sides of the projection 5, passing through both the left and right sides of the rectangular body. Although these large through holes 9 are circular in the illustrated example, they may be square or hexagonal.

In the examples shown in FIGS. 1 and 2, the protrusions 5 are provided on both the left and right sides, but they may be provided on only one side. However, in that case, the tip end surface 5a of the protrusion 5 is not waveformed but is made flat.

Next, a method of constructing a seawall using a large number of such blocks 1 will be explained.

First, as shown in FIG. 4, a plurality of blocks having projections 5 on both sides (hereinafter referred to as block 1a) are connected as one unit to form a first concrete block connected body A, or one side As shown in FIG. 5, a required plurality of blocks having protrusions 5 on only one side (hereinafter referred to as blocks 1b) are connected as one unit to form a second concrete block connected body B.

In the case of the first concrete block connected body A, the tip surfaces 5a of the protrusions 5 of the blocks 1a are engaged with each other as shown in FIG. 3, and one iron rod 10 is inserted into the matching small through holes 8. and tighten it with a nut inside the nut hole 7. In this concrete block connected body A, the blocks 1a are connected to each other by the protrusions 5 of both.
The spacing is maintained by Since the length of the protrusion 5 is approximately one quarter of the thickness of the rectangular parallelepiped as described above, the gap 11 between the blocks 1a is approximately half the thickness of the rectangular parallelepiped of one block 1a. .

In the case of the second concrete block connected body B, the sides of the blocks 1b without projections 5 are engaged with each other, or the tip surface 5a of the projection 5 of one block 1b is connected with the side surface of the other block 1b without projections. Engage and connect with iron rod in the same way. This concrete block connected body B has two configurations: blocks 1b that are joined to each other without any gaps, and blocks 1b that are connected with a gap 12 equal to the length of one protrusion 5.

Figures 6 and 7 show examples of construction of a seawall using these concrete block connections A and B. First, after installing the first stage of the first concrete block connected body A or the second concrete block connected body B in a row on the ground, the next stage of the concrete block connected body A or B is placed on top of it. The convex part 4 on the lower front side of the next block fits into the concave part 2 on the upper side of the lower block 1a or 1b, and the convex part 4 on the rear upper side of the lower block fits into the concave part 2 on the lower side of the next block. Concrete block connected body A or B is placed in such a way that they fit together, filled with backing material 13, and inserting erosion control sheet 15 between backing material 13 and buried soil 14. Stack them one after another, with the front and back discrepancies. In this case, as shown in FIG. 7, for example, the beginning of the end of the first stage is the second concrete block connected body B, and the first concrete block connected bodies A are then connected to this side by side in sequence. In the second stage, conversely, the beginning is the first concrete block connected body A, the end is the second concrete block connected body B, and the space between them is the first concrete block connected body A,
If the third stage is the same as the first stage, and the fourth stage is the same as the second stage, and they are stacked one after another, the block gaps 11 and 12 of the odd-numbered stages and those of the even-numbered stages will be arranged in a staggered manner. .

The revetment constructed in this way has the concave portions 2 and convex portions 4 of the upper and lower blocks interlocking with each other.
It will not slide due to earth pressure from the back. In addition, since the water behind the revetment flows out from the gaps between the left and right blocks or the gaps between the upper and lower blocks, residual water pressure will not be applied to the revetment structure. Since it is locked by the projections 5 within the gaps 11 and 12, it will not flow out to the front of the seawall.

Furthermore, by appropriately selecting the overall dimensions of the block 1a or 1b and the sizes of the concave portions 2 and convex portions 4, it is possible to match the slope when the concrete block combinations A and B are stacked to a predetermined design slope. Can be done. In the example in Figure 6, this slope is 5
There is a minute.

In a curved part of a river, the radius of curvature and the extension of the curve of the arranged blocks are different between the lower and upper stages. In this case, in the past, irregularly shaped blocks were used in some areas, or the uneven extension of the upper and lower tiers was unavoidable and the construction was continued as is. On the other hand, the first concrete block connected body A
According to the method, since the blocks can be freely bent to each other at the corrugated tip surface 5a of the protrusion 5, it is possible to accurately correspond to the radius of curvature at the site.
However, since the tip surface 5a has the above-mentioned waveform, the blocks 1a do not rotate about the iron rod 10. In addition, regarding the difference in curve extension, the length of protrusion 5 may be slightly changed (within a range of 5 to 25 mm).
By simply adjusting the gap between the connecting bodies by a few mm when the first concrete block connecting bodies A are arranged in succession, it is possible to accurately accommodate differences in the curve extension of each stage. In addition, adjusting the length of the protrusion 5 means that blocks that can accommodate any curve section can be created by simply replacing the molding frame, and various irregularly shaped blocks can be created depending on the radius of curvature. There is no need to prepare anything.

Furthermore, since the first and second concrete block connections A and B have gaps 11 and 12 formed by the protrusions 5, this is effective in weakening the force of flowing water. In addition, the front and rear large through holes 9 are such that when flowing water violently collides with the seawall, a considerable amount of the flowing water passes through these large through holes 9 and creates a complicated flow, so the force of the flowing water in front of the sea wall structure is reduced. It is very effective in reducing Furthermore, since the blocks 1a and 1b themselves and the concrete block connected bodies A and B can be moved and transported using this large through hole 9,
There is no need to specially embed hanging reinforcing bars, etc.
It's convenient.

The blocks 1a and 1b can be used not only for river bank protection, but also for preventing collapse of slopes of roads, railways, etc.

"Effects of the Invention" As detailed above, the concrete blocks for seawall of the present invention can be easily and stably connected and stacked, and the blocks can be stacked with their recesses and projections interlocking with each other. It is highly effective as a sea wall. Furthermore, the blocks can be connected to each other on the left and right by forming gaps with their own protrusions, and have large through holes that penetrate on both the left and right sides, so they have the effect of reducing the force of running water and preventing the backfilling material from flowing out. expensive.

Further, according to the construction method of the present invention, it is possible to efficiently construct a seawall suitable for the site even in areas with a small radius of curvature.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of a concrete block for a seawall according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged view of the blocks in a state where their protrusions are engaged with each other. FIG. 4 is a front view of a concrete block connected body in which a plurality of blocks are connected, and FIG. 5 is a front view of a concrete block connected body in which blocks having protrusions on only one side are connected. FIGS. 6 and 7 are a cross-sectional view and a front view of an example of the construction of a seawall using these connected concrete blocks. 1... Concrete block, 2... Recess, 3
...Chamfered side, 4...Protrusion, 5...Protrusion, 5a...
... Tip surface, A, B ... Concrete block connection body, 10 ... Iron rod, 13 ... Backfilling material.

Claims (1)

[Claims] 1. A trapezoidal recess 2 in the middle of both upper and lower surfaces of the rectangular parallelepiped.
At the same time, the upper and lower edges of the front and rear ends of the rectangular parallelepiped are chamfered to form trapezoidal upper and lower convex portions 4 on both the front and rear sides of the recessed portion 2, and at least one intermediate portion of the left and right sides is formed with a trapezoidal convex portion 4. , a projection 5 for maintaining the distance is integrally provided, and a small through hole 8 for inserting the iron bar is provided from the center of the projection 5 to the opposite surface, and both left and right sides of the rectangular body are provided on both the front and rear sides of the hole 8. A concrete block for a seawall characterized by being provided with a large through hole 9. 2 Trapezoidal recess 2 in the middle part of both the upper and lower sides of the rectangular parallelepiped
At the same time, the upper and lower edges of the front and rear ends of the rectangular parallelepiped are chamfered to form trapezoidal upper and lower convex parts 4 on both the front and rear sides of the recessed part 2, and a tip end surface is formed at the middle part of both the left and right sides. Protrusions 5 for maintaining distance with 5a as a corrugated surface are integrally provided, and a small through hole 8 for inserting an iron bar is provided through the center of both protrusions 5.
A large number of concrete blocks 1 are provided with large through holes 9 passing through both left and right sides of the rectangular parallelepiped on both front and rear sides thereof, and the corrugated tip surfaces 5a of the protrusions 5 are used as one unit. After connecting the concrete blocks by inserting iron rods into the matching small through holes 8, the plurality of sets of connected concrete blocks are fitted with each other's recesses 2 and protrusions 4, and A method of constructing a seawall characterized by stacking it in multiple stages while filling it with backfill material.