JP3844916B2 - Masonry block - Google Patents

Description

[0001]
The present invention relates to a block for a waterworks installed in a river, a masonry road, and the like, and more particularly, relates to a block for a masonry that is installed on a water bottom and protects it from scouring by a water flow .
[0002]
[Prior art]
A conventional floor protection block installed on the riverbed will be described with reference to FIGS. Figure 7 is a top perspective view showing a use state of the block 1 is a view showing a state in which installed a plurality of the blocks 1 and connected by a bolt 2 to the riverbed 3 together. Figure 8 is a front view showing one of a plurality of blocks 1 installed in the riverbed 3. Block 1 of this is a shape planar shape of the cross, are those having a predetermined thickness, tapers becomes lower part.
[0003]
When installing the block 1 of this, as shown in FIG. 8, embedding the bottom sediment and pebbles layer 4 deposited on the riverbed 3 in an upright state each block 1, the earth and sand to hold the block 1 by a layer 6 of the Kuriishi 5 gained Kuriishi 5 diameter of about 60~260mm on the layer 4.
Block 1, by installing the riverbed 3 along the quay river, which in the vicinity of Love lock 1 is installed, it is possible to reduce the rate of water flowing through the gap is what Kuriishi 5. This can make the fish habitat and easy environment of the gap and if Kuriishi 5 in the vicinity of this love lock 1, it is possible to increase the spawning of fish.
In addition, the clearance gap between the chestnuts 5 is an area through which fish can pass, and river water flows in the direction 7 shown in FIGS. 7 and 8 .
[0004]
[Problems to be solved by the invention]
However, in the conventional block 1, by the flow of the river water is part of the sand and pebbles that has been carried from upstream deposited dammed up on the side surface 8 of the upstream side of the lube lock 1 is the installed, this acts as a force pushing the gravel or the like Gab lock 1 which is stopped by the side surface 8 to downstream side. Hand, gravel or the like 4a in the vicinity of the downstream side of the side surface 9 of the block 1 are carried to downstream side by flowing water, it is possible to recess the portion of the riverbed 3 is formed, by this, block 1 of Kuriishi 5 in the vicinity of the downstream side surface 9 collapsed into the recess thereof, it is impossible to support As a result, the block 1 from the downstream side.
In this manner, when the above situation progresses, the bolt 2 is bend weight of each block to the bolt 2 for connecting each block 1 to each other is applied, it is that each block 1 tilts downstream side, appearance There is a problem of getting worse.
[0005]
The present invention aims at providing a difficulty had Mamoruyuka Engineering blocks slope by the water flow.
[0006]
[Means for Solving the Problems]
Engagement RuMamoruyuka Engineering block to the invention of claim 1 includes a main body portion, the body portion provided at the distal end portion of the body portion 3 or more which extend radially in a direction perpendicular to the longitudinal direction A first protrusion and three or more second protrusions which are provided at a base end portion of the main body portion with a distance from the first protrusion and radially extend in a direction perpendicular to the length direction of the main body portion. in Lube lock comprising projections and the center of gravity of the block of this it is characterized in that located in the base end side from the center of the body portion.
Engagement RuMamoruyuka Engineering block to the invention of claim 2, in the first aspect, each of the first and second protrusions has a substantially square cross-sectional shape orthogonal to each extending direction, each of these One diagonal line of the substantially quadrilateral is substantially perpendicular to the length direction of the main body.
[0007]
Engagement RuMamoruyuka Engineering block to the invention of claim 3, in the first or second invention, the body portion is substantially triangular or substantially rectangular cross section perpendicular to the longitudinal direction, the first and Each of the second protrusions extends outward from an intermediate portion of adjacent corner portions of the substantially triangular or substantially quadrangular cross-sectional shape of the main body portion.
Engagement RuMamoruyuka Engineering block to the invention of claim 4, first, in the second, or third invention, the body portion, wherein the proximal end portion is thicker shape than the tip It is what.
[0008]
According to engagement RuMamoruyuka Engineering block of the present invention, since the center of gravity is located at the base end, for example, the second protrusion on the river bed surface in a state of standing approximately vertically main body against riverbed those Ru can be installed by contact. When the block is placed in this manner, gravel or the like in the vicinity of the lower surface of the downstream side of the second projection of the block, for example, carried to downstream side by flowing water quickened speeds by swollen, depression that portion May be formed. However, since the second protrusions are formed radially with respect to the main body portion, the earth and sand that sequentially accumulate in the gaps between the second protrusions enter the depressions, thereby preventing the depressions from being formed. can do.
In this way, the second protrusions are embedded under the earth and sand carried by running water and are firmly fixed to the riverbed. Further, the first and second protrusions can be water flow resistance and reduce the speed of water.
[0009]
According to engagement RuMamoruyuka Engineering block to the invention of claim 2, when the a block of this example, a second protrusion installed in a state of standing on the riverbed in the bottom, the first and second of each projection Since the upper and lower surfaces on the upper side of the river form an inclined surface that extends upward or downward with respect to the direction in which the water flows, water flows upward or downward along the inclined surface. Thus, gravel or the like that has been carried from upstream by flowing water can be reduced force to push the block of this the downstream side.
[0010]
According to engagement RuMamoruyuka Engineering block to the invention of claim 3, the second protrusions make a body portion facing downward, one corner of the plurality of corner portions formed on the side surface of the main body portion Can be changed to the left and right along the flat left and right side surfaces on the upper river side of the main body to change the direction of the flow. And the water divided into right and left can be divided up and down along the flat upper and lower surfaces on the river upper side of the first and second protrusions, thereby changing the direction of the flow.
[0011]
According to engagement RuMamoruyuka Engineering block to the invention of claim 4, body portion proximal end since it is thicker shape than the tip portion, when installed in an upright body portion, of this block The center of gravity can be lowered.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment of the engagement RuMamoruyuka Engineering block of the present invention will be described with reference to the drawings. This block is made of concrete, for example, as shown in FIG. 2 (a), it can be installed and used in river or the bottom of the channel (riverbed). In each figure, 10 is a main body, 11 is a first protrusion, and 12 is a second protrusion. 1 (a) is a plan view of a block, and FIG. 1 (b) is a front view of a block, FIG. 2 (a) is a front view of the block that is installed from the front of the oblique 45 °.
As shown in FIGS. 1 and 2, the main body 10 is a columnar body having a square cross-sectional shape orthogonal to the length direction (center axis) 13 of the main body 10.
[0013]
Four first protrusions 11 are radially extended from the distal end (upper end) 14 of the main body 10 in a direction perpendicular to the direction of the central axis 13 of the main body 10. Each of the first protrusions 11 has the same shape, and extends outward from an intermediate portion of the corner portions 15 adjacent to each other in the square cross-sectional shape of the main body portion 10 and is provided on the same horizontal plane. . That is, as shown in FIG. 1A, the four first protrusions 11 have a cross shape in plan view. As shown in FIG. 1B, each first protrusion 11 has a square cross-sectional shape orthogonal to the extending direction, and one diagonal line 16 of each square is perpendicular to the central axis 13. It is formed in the direction. Then, the lower edge of each first protrusion 11 is chamfered, and the width of the surface 17 formed by the chamfering in the direction parallel to the corresponding diagonal line 16 is directed toward the tip end portion 14 of the first protrusion 11. Has spread according to.
[0014]
As shown in FIGS. 1 and 2, four second protrusions 12 are radially extended from the base end (lower end) 18 of the main body 10 in a direction perpendicular to the central axis 13. These four second protrusions 12 have a shape that is substantially symmetrical with the four first protrusions 11 in the vertical direction, and outward from an intermediate portion of the corner portions 15 adjacent to each other in the square cross-sectional shape of the main body portion 10. It is extended and provided on the same horizontal plane. The upper edge of each second protrusion 12 is chamfered, and the width of the surface 19 formed by the chamfering in the direction parallel to the diagonal line 20 increases toward the tip end portion 14 of the second protrusion 12. ing.
The chamfering of the first and second protrusions 11 and 12 is due to manufacturing convenience. Therefore, the chamfering can be omitted by changing the shape of the mold, for example, so that the lower edge of the first protrusion 11 and the upper edge of the second protrusion 12 do not need to be chamfered. .
[0015]
As shown in the front view of FIG. 1B, the main body 10 has a width and depth that increase from the upper end surface 21 toward the center of the first protrusion 11, and the first protrusion 11 extends from the center. The width and depth become narrower toward the lower edge. The width and depth increase from the lower edge of the first protrusion 11 toward the center of the second protrusion 12, and from this center to the lower edge of the second protrusion 12 (the lower end surface 22 of the main body 10). The width and depth become narrower as you go. The width and depth of the main body 10 are longer at the proximal end 18 than at the distal end 14. This ensures that the center of gravity of the block is to be located on the base end portion 18 side than the center of the main body portion 10.
[0016]
Mamoruyuka Engineering for blocks configured as described above, for example, as shown in the plan view of FIG. 3 (a), perpendicular to the direction 7 of flow of the river being in contact all the blocks from one another A plurality of rows can be arranged in the direction and installed at the same height on the riverbed 3 for use. And this time, as appearing in FIG. 3 (a), with one of the diagonal lines 23 of the respective body portion 10 as viewed from above is parallel to the direction 7 of flow of the river, each block (figure even columns 3 (a) is appears that block in the second column.) are block of the first column into two blocks adjacent to each other of the odd-numbered column of the upstream side (FIG. 3 (a) Is shown in the middle position).
2 (a) is a diagram showing one of a plurality of blocks shown in FIG. 3 (a). 2 is a layer of earth and sand and pebbles, and 6 is a layer of chestnut stone 5. This block second protrusion four of 12 is embedded in the layer 4 of the gravel or the like, the four upper portion of the first protrusion 11 is exposed from the surface of the layer 6 of Kuriishi 5. The gap between the chestnut stones 5 is a dimension through which fish can pass, and the fish can use this gap as a house.
[0017]
According to Mamoruyuka Engineering for this block, the portion of sand and pebbles that has been carried from upstream by flowing water, FIG. 2 (a), the as shown in FIG. 3 (a), of the installation which do Lube lock The upper side 26 and the lower side 27 on the river upper side of each of the four first projections 11 and the river upper side of each of the four second projections 12 are divided into right and left along the two side surfaces 24 and 25 on the river upper side of the main body 10. It is divided into upper and lower sides along the upper surface 28 and the lower surface 29 and is carried downstream. As a result, it is possible to gravel or the like to reduce the force to push the block of this the downstream side. Hand, gravel or the like in the vicinity of the downstream side of the lower surface 30 of the second protrusion 12 of the block, for example, carried to downstream side by flowing water quickened speeds by flooding, dimple 31 in this portion is formed However, the earth and sand accumulated in the gaps between the second protrusions 12 provided in a radial pattern, and the earth and sand accumulated in the gaps in succession are indentations 31 near the second protrusions 12. This can prevent a depression from being formed in the lower portion of the second protrusion 12. As a result, lube lock is installed in the riverbed 3 can be prevented tipping downstream side.
[0018]
Then, FIG. 2 (a), the as shown in FIG. 3 (a), flowing water, the flow direction change is divided into right and left along the two sides 24, 25 of the upstream side of the main body portion 10 of the block The direction of the flow is changed by dividing vertically along the upper surface 26 and the lower surface 27 on the river upper side of the four first protrusions 11 and the upper surface 28 and 29 on the upper surface of the river side of the four second protrusions 12. Will head to the downstream side. By changing the direction of the flow in this way, the speed of the flowing water in the gap between the chestnut stones 5 can be reduced, so that the fish can inhabit and lay eggs easily.
[0019]
In addition, since the first protrusions 11 and the second protrusions 12 are radially provided at both end portions 14 and 18 of the main body 10, the main body 10 flows in the direction of the river 7 when the typhoon or the like increases. and a horizontal state in a substantially right angle with respect to, even in a state where the main body portion 10 is parallel to the direction 7 of flow of the river, is less likely to this block is passed through to the downstream side, the downstream structure it is possible to avoid damage by block of Monooko.
[0020]
However, in the above embodiment, as shown in FIG. 2 (a), the four second protrusions 12 of the block Yes embedded in the layer 4 of the gravel or the like, the four upper portion of the first protrusion 11 is Kuriishi 5 of it are installed in a state of being exposed from the surface of the layer 6, instead of this, FIG. 2 (b), the river bottom and the lower edge of the second protrusion 12 in an upright state block 3 You may install by mounting in the upper surface. Each block, as in the above embodiment, as shown in FIG. 3 (a), by arranging a plurality of rows in a direction at right angles to the direction of flow of the river in a state in contact all the blocks from one another is there.
[0021]
Even when installing a block as shown in FIG. 2 (b), without thereby recess the second protrusion 12 a layer 4 of gravel or the like in the vicinity of the downstream side of the lower surface 30, and therefore, this block Will not tilt down the river. And this way, the upright state is maintained without block tilts, gravel or the like that has been carried by the flowing water will sequentially deposited on the second protrusion 12, eventually the second protrusion 12 is sediment It will be in the state embedded in etc. It becomes this state, block is in a state of being fixed securely to the riverbed 3.
Installation method shown in FIG. 2 (b), Ki de be used if you try to reduce the flow rate of the water, detail because they act on the installation method the same way as shown in FIGS. 2 (a) Description is omitted.
[0022]
Then, in the above embodiment, when looking at a large number of blocks placed from above, it has been installed in sequence as shown in FIG. 3 (a), instead of this, FIG. 3 (b), the 4 ( You may arrange and install as shown to a) or FIG.4 (b). In other words, FIG. 3 (b), the FIG. 4 (a), the and shown to block in FIG. 4 (b), as shown in FIG. 3 (a), in a direction perpendicular to the direction 7 of flow of the river It is arranged in multiple rows and installed at the same height on the riverbed. And with one of the diagonal lines 23 of the respective body portion 10 as viewed from above is parallel to the direction 7 of flow of the river, each block of the even columns, the two blanking mutually adjacent odd-th column of the upstream-side It is located at the middle position of the lock.
Here, in the arrangement shown in FIG. 3 (b), the first projection 11 of each block (second projection 12) Yes disposed so as to be aligned on the same line, there against the respective distal end surface .
Figure 4 where the sequence of shown to block in (a) is different from that shown in FIG. 3 (a), those shown in FIG. 3 (a) is contacted with each other which blocks are adjacent to each other whereas there, than that shown in FIG. 4 (a), the place where adjacent coupling vellus locks are spaced apart from one another. The rest of the arrangement is the same as that shown in FIG.
[0023]
4 where (b) to indicate to the block sequence is different from that shown in FIG. 3 (a), those shown in FIG. 3 (a), each block of the even columns are in the upstream side whereas in contact with two both blocks adjacent to each other of the odd-numbered column that is installed, those shown in FIG. 4 (b), each block of the even columns are in the upstream side While one is in contact with one of the two blocks adjacent to each other of the odd-numbered column that is located at a place that is not in contact with the other. The rest of the arrangement is the same as that shown in FIG.
[0024]
Moreover, in the said embodiment, as shown to Fig.2 (a), it installed in the riverbed 3 in the state which stood the main-body part 10 with the 2nd protrusion 12 down, but it replaces with this and shows in FIG. As described above, the main body portion 10 can be laid down and the first protrusion 11 can be directed toward the river upper side and the second protrusion 12 can be disposed toward the downstream side. In addition, 4 shown in FIG. 5 is a layer of earth and sand and pebbles, and 6 is a layer of chestnut stone 5. At this time, for example, they can be arranged as shown in the plan view of FIG . 6 (a) or FIG. 6 (b) .
In the arrangement shown in FIG. 6 (a), side by side a plurality of rows along the direction 7 of flow of the river all blocks in a state spaced from each other, are installed at the same height in the riverbed 3. Then, while the first projection 11 of each block of the first protrusion 11 of each of the blocks of one row of two adjacent rows other row corresponding to each other of the second protrusion 12 It is arranged.
[0025]
In the arrangement shown in FIG. 6 (b), by arranging a plurality of rows in a direction at right angles to the direction 7 of flow of the river in a state in contact all the blocks from each other, it is installed at the same height in the riverbed 3. Each block of the even columns is is arranged in an intermediate position of the two blocks adjacent to each other of the odd-numbered column of the upstream side.
[0026]
5, FIG. 6 (a), the said installation the block as shown in FIG. 6 (b), the portion of sand and pebbles that has been carried from upstream by flowing water, as shown in FIG. 5 or the like, the installed have Lube locking each side of the shape extending toward the downstream side from the upstream side of the main body portion 10 24,25,32, divided into the left and right of the upper left and lower side along the ..., 4 The upper side 33 and the lower side 26 on the upstream side of each of the first projections 11 and the upper side 34 and the lower side 28 on the upper side of each of the four second projections 12 are divided into upper and lower sides and are carried downstream. . As a result, it is possible to gravel or the like to reduce the force to push the block of this the downstream side. Hand, gravel or the like in the vicinity of each of the lower surface 27, 29 of the downstream side of the first and second protrusions 11 and 12 of the block, for example, carried to downstream side by flowing water quickened speeds by flooding, A small depression is about to be formed in this part, but earth and sand carried from the river enters the depression in the vicinity of the first and second protrusions 11, 12, thereby the first and second protrusions. It is possible to prevent the depression of the portion of the layer 4 such as earth and sand 11 and 12 on the downstream side. As a result, lube lock is installed in the riverbed 3 can be prevented tipping downstream side. The first and second protrusions 11 and 12 are shaped so that the earth and sand carried from the upstream can be directed downstream along the upper and lower surfaces of the downstream. The depression is filled with earth and sand.
[0027]
Then, 5, as shown in FIG. 6 (a), FIG. 6 (b), the flowing water, to the upper left and right side surfaces 32, 32 and lower left and right side surfaces 24, 25 of the main body portion 10 of the block The direction of the flow is changed in four directions along the upper surface 33 and the lower surface 26 on the river upper side of each of the four first protrusions 11, and the upper surface 34 and the lower surface 28 on the river upper side of each of the four second protrusions 12. It will be divided up and down along the direction of the flow and will change to the downstream side. Thereby, since the speed of the flowing water in the clearance gap between the chestnut stones 5 can be reduced, it is possible to facilitate fish inhabiting and egg laying.
[0028]
And in the said embodiment, as shown in FIG. 1, although the cross-sectional shape orthogonal to the central axis 13 of the main-body part 10 was made into square, it is good also as polygons or circles other than a square. When the cross-sectional shape is a triangle, the first and second protrusions 11 and 12 are formed to extend outward from an intermediate portion of the corner portions 15 adjacent to each other in the triangular cross-sectional shape of the main body portion 10. Accordingly, the three first protrusions 11 are provided at the distal end portion 14 of the main body 10 and extend radially in a direction perpendicular to the central axis 13 of the main body 10. The three second protrusions 12 are provided at the base end portion 18 of the main body portion 10 and extend radially in a direction orthogonal to the central axis 13 of the main body portion 10. Of course, five or more first and second protrusions 11 and 12 may be provided.
[0029]
Moreover, although the 1st and 2nd protrusions 11 and 12 made the cross-sectional shape orthogonal to the extending direction square, it is good also as polygons or circles other than a square.
Furthermore, in the said embodiment, although the 1st protrusion 11 and the 2nd protrusion 12 were made into the same length, you may form the 2nd protrusion 12 longer than the 1st protrusion 11. FIG. The second protrusion 12 may be thicker than the first protrusion 11. Thus, as compared with that shown in FIG. 1, it can be located more proximal end 18 side than the center of the center of gravity of the main body portion 10 of the block of this, as a result, when installed is erected It can be made difficult to tilt.
[0030]
【The invention's effect】
According to engagement RuMamoruyuka Engineering block of the present invention, since the center of gravity is located at the base end side from the center of the body portion, for example, stable in a state of upright body portion relative to the riverbed installation can do. And since the 2nd protrusion is formed radially and earth and sand etc. accumulates sequentially in those crevice, make sure that a hollow is not formed in the river bottom near the lower face of the 2nd protrusion on the downstream side. Can do. This can the installed blocks in the river bed is prevented from tilting.
The second projection is in a state of being buried under the soil that has been carried from upstream, since the be firmly fixed to the riverbed, this block is, by the force of impact and sediment of the water flow It does not tilt.
In addition, the first and second protrusions can resist water flow and reduce the speed of the water. For example, by placing chestnuts on the bottom of the river, it is easy for fish to live in the gaps between the chestnuts. Can increase the spawning of fish.
Furthermore, since the first protrusion and the second protrusion are provided radially at both ends of the main body part, when the typhoon or the like increases the water, for example, the main body part that has fallen in the direction in which the river flows. state and having a substantially right angle against main body portion even in a state parallel to the direction of flow of the river, less likely to this block is passed through to the downstream side, this structure of the downstream it is possible to avoid damage by block.
[0031]
According to engagement RuMamoruyuka Engineering block to the invention of claim 2, when the a block of this example, a second protrusion installed in a state of standing on the riverbed in the lower, water, the first and second It flows toward the upper side or the lower side along the upper and lower surfaces of the upper side of each projection. Thus, gravel or the like that has been carried by flowing water from upstream can be effectively reduced force to push the block of this the downstream side. As a result, lube lock is installed in the river bed can be prevented inclined downstream side. And since the 1st and 2nd protrusion can change the direction where each upper and lower surface of a river flows into the upper side and the lower direction, the speed of water can also be reduced by this.
[0032]
According to engagement RuMamoruyuka Engineering block to the invention of claim 3, the second protrusions make a body portion facing downward, one corner of the plurality of corner portions formed on the side surface of the main body portion Since the cross-sectional shape of the main body is a triangle or a quadrangle, the water of the river that collided with the main body is divided into left and right along the flat left and right sides of the upper side of the main body. To change the direction of flow. Thus, gravel or the like that has been carried by flowing water from upstream can be effectively reduced force to push the block of this the downstream side. As a result, lube lock is installed in the river bed can be prevented from tilting. And since the main-body part can change the flow direction of water on the left and right surfaces on the upper side of the river into the left side and the right side, the speed of the water can also be reduced.
[0033]
According to engagement RuMamoruyuka Engineering block to the invention of claim 4, body portion proximal end since it is thicker shape than the tip portion, when installed in an upright body portion, of this block The center of gravity can be lowered. This can the installed blocks the stand and is hard to fall by flowing water.
[0034]
[Brief description of the drawings]
Figure 1 is a view showing the engagement RuMamoruyuka Engineering block to an embodiment of the present invention, (a) is a plan view, (b) a front view.
Figure 2 is a side view showing an installed state of upright engagement RuMamoruyuka Engineering block to the embodiment, (a) is a diagram showing a case where embedded block to the riverbed, (b) is It is a figure which shows the case where it mounts on a riverbed.
[3] (a), (b) is a plan view showing an example of arrangement of engaging RuMamoruyuka Engineering block to the embodiment.
[4] (a), it is a plan view showing another example of (b) an array of engagement RuMamoruyuka Engineering block to the embodiment.
5 is a side view showing a state where the installed aged engagement RuMamoruyuka Engineering block the riverbed to the embodiment.
6 (a), is a plan view showing another example of (b) an array of engagement RuMamoruyuka Engineering block to the embodiment.
FIG. 7 is a perspective view of a state in which a plurality of conventional floor protection blocks are connected and installed, as viewed obliquely from above.
FIG. 8 is a side view showing a state where one of the conventional floor protection blocks shown in FIG . 7 is installed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 River bed 4 Layers of earth and sand 5 Kuriishi 6 Kuriishi layer 7 Water flow direction 10 Main body part 11 First protrusion 12 Second protrusion 13 Central axis 14 Front end part 15 Corner part 18 Base end part 16, 20 Diagonal line

Claims (4)

A main body, three or more first protrusions provided at a distal end of the main body and extending radially in a direction perpendicular to the length direction of the main body, and the first protrusion spaced apart from each other; in Lube lock and a three or more second protrusions which extend radially in a direction perpendicular to the longitudinal direction of the body portion provided at the proximal end portion of the body portion, of this block features and to RuMamoruyuka Engineering blocks that the center of gravity is located in the base end side from the center of the body portion. In the floor protection block according to claim 1, each of the first and second protrusions has a substantially quadrangular cross-sectional shape perpendicular to the extending direction, and one diagonal line of each of the substantially quadrangular shapes is the above-described diagonal line. features and to RuMamoruyuka Engineering blocks that form a substantially right angle to the length direction of the main body portion. 3. The floor protection block according to claim 1, wherein the main body has a substantially triangular or substantially quadrangular cross-sectional shape perpendicular to the length direction, and the first and second protrusions are formed by the main body. features and to RuMamoruyuka Engineering block that extending outwardly from the intermediate portion of the adjacent corner portions to each other cross-sectional shape of a substantially triangular or substantially rectangular parts. In Mamoruyuka Engineering block of claim 1, 2 or 3, the body portion, wherein the to RuMamoruyuka Engineering block that the base end portion is thicker shape than the distal portion.

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