JPS6338485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a large concrete block for a river bank or earth retaining bank, and a method of constructing a bank using the same.

``Prior Art'' Conventionally, small stacking blocks or large wave-dissipating footing blocks have been used as river banks or earth retaining banks.

``Problems to be solved by the invention'' However, the former method was time-consuming and unsuitable for emergency cases or large-scale construction. Another disadvantage is that when the water behind the seawall becomes saturated due to heavy rain, etc., the blocks are easy to collapse because they are lightweight.

On the other hand, in the latter case, because the gaps between the blocks were large, the earth and sand on the back of the seawall were washed away, and the land was prone to damage such as collapse. Additionally, large wave-dissipating footing blocks have been very difficult to adapt to small curves.

``Object of the Invention'' The object of the present invention is to be able to be stacked easily and stably, to be adaptable to areas with a small radius of curvature, and to have a bank protection effect, an earth retaining effect, and a force reduction effect against flowing water. To provide a good concrete block and a method of constructing a seawall using the concrete block, which can efficiently construct a seawall even in a place with a small radius of curvature.

``Means for Solving the Problems'' The concrete block according to the present invention has a T-shaped plane as a whole, a drum-shaped side surface, and a constricted constriction by forming a trapezoidal recess in the middle of the upper and lower surfaces. , a small bulge that is almost square in front and has a trapezoidal convexity on both the upper and lower sides, which is continuous on one side of the front and back, and has a width that is almost the same as that, but has a trapezoidal convex part on both the upper and lower sides, and a small bulge that is continuous on the opposite side and has a similar width on both the upper and lower sides. It has a trapezoidal convex part and a large ampullae that is almost horizontally rectangular in the front and has convex parts on both left and right sides, and has a vertically long protruding stripe on one of the left and right end surfaces of the large ampullae, and a vertically long protruding strip on the other side. It is formed by forming a groove.

It is preferable that the constricted portion is provided with large through holes penetrating both left and right side surfaces thereof.

In addition, the method for constructing a seawall according to the present invention uses a large number of concrete blocks having the structure described above, and fits the above-mentioned protrusions and grooves of the concrete blocks of the same level, and also connects the concave portions of the concrete blocks of the lower level. The convex part of the small or large part of the upper concrete block is fitted into the concrete block, and the blocks are sequentially stacked in multiple stages while being filled with backing material.

``Function'' In the left-right direction, the blocks can fit the convex shapes and the grooves on both the left and right ends of the large ampullae, and can be bent into each other in the fitted state. In addition, in the vertical direction, the upper and lower convex portions of the large and small enlarged portions and the concave portions of the constricted portions can be engaged with each other to lock back and forth movement.

By providing large through holes that penetrate both left and right sides of the constriction, running water can be passed through the large through holes to the left and right.

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

FIG. 1 is a plan view of one concrete block (hereinafter referred to as the main block) 1 according to the present invention;
FIG. 2 is a side view thereof. This block 1 has a T-shaped plane as a whole and a drum-shaped side surface, and has a constricted constricted part 3 by forming a trapezoidal concave part 2 in the middle part of both the upper and lower surfaces, and a constricted part 3 that continues from the constricted part 3 on the front side. It consists of a small enlarged part 4 which is substantially square in front and bulges both upward and downward, and a large enlarged part 5 which is substantially oblong rectangular and continues behind the constricted part 3 and bulges out in four directions, up, down, right and left.

The small enlarged part 4 has the same width as the constricted part 3, but by chamfering the upper and lower edges and the left and right edges of the square to form chamfered edges 6, it can fit into the recesses 2 of other blocks 1 on both the upper and lower sides. A trapezoidal convex portion 7 of a size that can be matched is formed.

By chamfering the upper and lower edges of the horizontally long rectangle to form chamfered sides 8, the large ampulla 5 also has a small ampulla 4.
Upper and lower protrusions 9 are formed that are approximately the same size as the protrusions 7, and the height of the large ampulla 5 is the same as that of the small ampulla 4. The large enlarged portion 5 further forms left and right convex portions 10 that protrude on both left and right sides. Each of these convex parts 10 has a curved vertically long convex line 11 on one end face, and a vertically long concave groove 12 that is curved and recessed in order to fit the convex line 11 of another block 1 on the other end face. is forming.

The constricted portion 3 is provided with a large through hole 13 passing through both left and right sides thereof. In addition, this large through hole 13
In the example shown in the figure, it is circular, but it may also be square, hexagonal, etc.

For example, this block 1 has a width of about 1 m from side to side of the large ampulla 5, a total length of about 1 m from front to back including the constriction part 3 and a small ampulla 4, and a weight of about 1 ton. However, the size etc. can be selected as appropriate.

Figures 3 and 4 show an example of construction of a river bank using Block 1 as described above. First, the convex ridges 11 and the grooves 12 of the block 1 are aligned with the small enlarged portion 4 facing forward.
Fit them together and line them up in a row on the left and right on the ground, and install the first stage. In this case, since the thickness of the large ampulla 5 may be relatively thin, the blocks 1 may be arranged at a slight angle to each other while adjusting the gap formed between the protrusions 11 and the grooves 12. This allows it to adapt to curved sections with a practically extremely small radius of curvature, for example, about 30 m. Next, the second stage block 1 is placed on top of the first stage block 1, and the convex part 7 on the lower side of the small enlarged part 4 of the second stage block 1 is placed in the concave part 2 above the first stage block 1.
The block 1 is installed so that the convex part 9 on the upper side of the large enlarged part 5 of the first stage fits into the concave part 2 on the lower side of the second stage. The convex strips 11 and the grooves 12 are fitted together, and the backing material 14 is filled, and the second stage is arranged so that it meshes with the first stage with a difference in the front and back, and is also arranged with a difference in the left and right direction. Stacking, backing material 1
4 and earth and sand 15, etc., are repeated and piled up one after another, forming what is called a cloth pile.

In the river revetment constructed in this way, the concave portions 2 of the upper and lower blocks 1 are engaged with the convex portions 7 and 8, and the convex strips 11 of the left and right blocks 1 are engaged with the concave grooves 12, so that the There is no chance of it slipping due to earth pressure. In addition, the water behind the seawall is
Since water 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. Furthermore, when arranging the blocks 1 from side to side, if there is a slight gap between the protrusions 11 and the grooves 12, and if an erosion control sheet or the like is interposed between the gaps, the drainage of water on the back of the seawall will be further improved. Moreover, it is possible to prevent soil from flowing out from the back.

In addition, on the back of the seawall, as shown in Fig. 4, gaps 16 between the constrictions 3 and small bulges 4 of the left and right blocks 1 are arranged in a staggered pattern alternately in odd-numbered stages and even-numbered stages. Therefore, it has a high roughness coefficient and has a good effect of reducing the force of flowing water. In addition, large through hole 13
When flowing water violently collides with the seawall, a considerable amount of the flowing water passes through this large through hole 13 and creates a complicated flow, so it is very effective in reducing the force of the flowing water in front of the seawall structure. be. Note that since the block 1 itself can be moved and transported using this large through hole 13, there is no need to specially embed hanging reinforcing bars or the like, which is convenient.

Furthermore, by appropriately setting the overall dimensions of the block 1 and the sizes of the concave portions 2 and convex portions 7 and 9,
The slope when stacked up can be matched to a predetermined design slope. In the example of FIG. 3, this slope is set to 5 minutes.

FIGS. 5 and 6 are construction examples of earth retaining revetments or river revetments where the roughness coefficient does not need to be so large. In this example, Figures 3 and 4
The front and rear directions of the blocks 1 are reversed from the case shown in the figure, that is, the large ampulla 5 faces the front side, and the blocks 1 are arranged and stacked in the same manner as above, and the blocks 1 are inserted into the gap between the constriction 3 and the small ampulla 4 of each other. The large through hole 13 is also filled with the backfilling material 14, and the block 1 and the backfilling material 14 are integrated to form a highly stable revetment.

"Effects of the Invention" As detailed above, the concrete blocks of the present invention can be stacked easily and stably, and in the vertical direction, the upper and lower convex portions and concave portions of the blocks are engaged with each other. Since the blocks can be stacked together and arranged by fitting the left and right protrusions and grooves of the large bulges of the blocks in the left and right direction, the bank protection effect is high. Moreover, since the blocks can be arranged at an angle with their left and right protrusions and grooves fitted together, it is possible to adapt to a small radius of curvature. Furthermore, since the blocks can be arranged with gaps formed by their own large bulges, and have large through-holes penetrating left and right, they have a good effect of reducing the force of flowing water and have good integrity with the backing material.

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 plan view of an example of the concrete block of the present invention, and FIG. 2 is a side view thereof. 3 and 4 are a sectional view and a front view of an example of the construction of a river bank using this block, and FIGS. 5 and 6 are a sectional view and a front view of an example of the construction of an earth retaining bank. 1... Concrete block, 2... Recess, 3
... constriction, 4 ... small ampulla, 5 ... large ampulla, 7, 9, 10 ... convex section, 11 ... protrusion, 12
...Concave groove, 13...Large through hole, 14...Backing material.

Claims (1)

[Scope of Claims] 1 The plane as a whole is T-shaped, the sides are drum-shaped, and a trapezoidal concave part 2 is formed in the middle part of both the upper and lower surfaces to form a constricted constricted part 3, which is continuous on one side of the front and rear sides. The width is almost the same as that, but there is a small enlarged part 4 which is almost square in the front and has trapezoidal protrusions 7 on both the upper and lower sides, and a similar trapezoidal protrusion 9 which continues on the opposite side and has trapezoidal protrusions 9 on both the upper and lower sides. It also has a large ampulla 5 which is substantially horizontally rectangular in the front and has convex portions 10 on both left and right sides, and has a vertically long protrusion 11 on one of the left and right end surfaces of the large ampulla 5 and a vertically long concave on the other side. Groove 12
A concrete block characterized by forming. 2 The plane as a whole is T-shaped, the sides are drum-shaped, and the constriction 3 is constricted by forming a trapezoidal concave part 2 in the middle part of both the upper and lower surfaces, and the constriction part 3 is continuous on one side of the front and back, and the width is almost the same as that constriction part 3 However, it has a small enlarged part 4 which is almost square in the front face with trapezoidal convex parts 7 on both the upper and lower sides, and a similar trapezoidal convex part 9 on both the upper and lower sides that continues on the opposite side, and also has trapezoidal convex parts 9 on both the left and right sides. It consists of a large enlarged part 5 which is substantially oblong rectangular in front and has a protrusion 10 on the front side, and a vertically long protruding strip 11 on one of the left and right end surfaces of the large enlarged part 5, and a vertically elongated groove 12 on the other side.
, and is further provided with large through holes 13 penetrating both left and right sides of the constricted portion 3. 3 The plane as a whole is T-shaped, the sides are drum-shaped, and the constriction 3 is constricted by forming a trapezoidal concave part 2 in the middle part of both the upper and lower surfaces, and the constriction part 3 is continuous on one side of the front and back, and the width is almost the same as that constriction part 3 However, it has a small enlarged part 4 which is almost square in the front face with trapezoidal convex parts 7 on both the upper and lower sides, and a similar trapezoidal convex part 9 on both the upper and lower sides that continues on the opposite side, and also has trapezoidal convex parts 9 on both the left and right sides. It consists of a large enlarged part 5 which is substantially oblong rectangular in front and has a protrusion 10 on the front side, and a vertically long protruding strip 11 on one of the left and right end surfaces of the large enlarged part 5, and a vertically elongated groove 12 on the other side.
A large number of concrete blocks 1 are used, and the convex strips 11 and grooves 12 of the concrete blocks 1 in the same stage are fitted together, and the concave portions 2 of the concrete blocks 1 in the lower stage are fitted into the recesses 2 of the concrete blocks 1 in the upper stage. A method for constructing a seawall, which comprises sequentially stacking the convex portions 7 of the small bulge portion 4 or the bulge portions 9 of the large bulge portion 5 in multiple stages while filling them with a backing material 14.