A new type of wave dissipating block with 4 hollows on the surface
RAKUNA
NIKKEN KOGAKU CO.,LTD.http://nikken.kogaku.co.jp
It was demonstrated by Joint Reserch with Water Resources University and Nikken Kogaku Co.,Ltd. (2011)
where H s Significant wave heightr s Mass density of concreter w Mass density of water (r s / r w ) - 1
D n Nominal DiameterThis coefficient is valid for 1:1.5 slope.
K D value for Hudson's formulaK D = on trunk sectionsK D = on breakwater heads7.2
=N s = H s /(D n )
10.8
2.53
RAKUNA is NETIS registration technology.NETIS:New Technology Information System of
MLIT(Ministry of Land, Infrastructure, Transport and Tourism) in Japan
Sloping Breakwaterhydraulic stability
It was demonstrated by Joint Reserch with Kyoto University and Nikken Kogaku Co.,Ltd. (2007)
N s has a value for each deepwater wave steepness S 0 .S 0>0.04 N s =0.04S 00.02 N s =0.02>S 0 N s =
where H 0 deepwater wave heightL 0 deepwater wavelengthS 0 deepwater wave steepness (=H 0 /L 0 )These coefficients are valid for 1:1.5 slope.
K D value for Hudson's formulatrunk sections K D =
K D =K D =
breakwater heads K D =K D =K D =
note:
9.446.35
7.80
H s /(D n )
11.71
=
You can use the same value in Two layer. We confirmed that Two layer has the equal stability with thefull face form by the hydraulic experiments with irregular waves.
0.04S 00.020.02>S 0
6.294.23
2.60
S 0>0.04
2.42
0.02>S 0
0.04S 00.02
N s
2.12
S 0>0.04
Upright Breakwater
Shape size
The filleting is attached to more than 40t type.
cb2a
HD
HL
LD
e
19.06 2,447 2,683 2,959
1,810 1,984 2,1894t 3.92 1.707 10.45
1,475 1,6172t 2.12 0.924 6.94Calculated by 2.3t/m3
15.89
8.736
8t 7.85
16t
10t 9.72 4.225
Concretevolume (m3)
Size
30.93
6t
3.415
6.908
20t 20.09
Metal formarea (m2)
Actual weight (t)
49.82 21.661
64t
10.861
49.16
59.92 26.055
80t
40t 40.92
80.74 35.104
50t
21.76
6.25 14.19
25t
17.792
35.76
32t 32.35 14.065
24.98
63.39
2.716
16.54
12t 11.85 5.154
42.49
56.05
77.33
26.45
Basic dimensionsunitmmH
2,112
2,280
2,615
2,884
3,118
3,353
3,655
3,956
4,225
4,493
4,962
L
2,315
2,499
2,866
3,160
3,417
3,675
4,005
4,321
4,614
4,907
5,420
D
2,553
2,756
3,161
3,486
3,769
1,783
4,053
4,418
4,783
5,107
5,431
5,999
630
a
680
780
730
860
540
440
930
1,000
1,090
1,180
1,260
1,340
1,480
658
b
710
814
459
564
762
898
971
1,044
1,138
1,181
1,261
1,341
1,481
c
555
599
687
388
476
643
758
819
881
960
1,039
1,110
1,180
1,304
e
1,874
2,023
2,320
1,309
1,607
2,172
2,558
4,403
2,767
2,975
3,243
3,511
3,749
3,987
The standard of the block slope is 1:1.3 - 1:2.0.
Required block number N is calculated by the next formula.
V 1 N required block number concrete volume of one blockm3 Total construction volume of RAKUNAm3 void ratio56.5
unitm
8.6510t 3.00 2.74 3.74
2.70 3.83 4.58 4.504t 2.20 2.03 2.782.20 3.11 3.72 3.652t 1.80 1.66 2.27
Layerthickness
: hSize
2-levee crown rows
N v
8t2.386t
12t
2.552.80
3.20 2.93
4.487.15
B' B(common)
B'
4.61 5.22 5.155.68
8.33
6.43 6.35
B(common) 1.5
5.352.55 3.40
3.253.50
n=1.3
4.02 3.90
4.85 5.80
5.63 6.723.65 5.19 6.19
7.408.10
3-levee crown rows
3.155.70
1.5
4-levee crown rows
1.5B' B
(common) 1.3
5.25 6.63
9.42
7.50
6.606.10 7.69 8.69
8.00
9.30
1.3
Vertical breakwater covering form
2-layer covering method
Calcuration of required block number
B'
1 : n Bh
The above table is a standard size. We can do this other designs, please feel free to consult with us.
unitm
2t 1.95 3.27 4.59
3.55
4.50
3.8020t3.23 9.036.13
4.60 9.8510.56
7.946.653.45
6.085.57
4.444.74
5.00
4.30 7.34
12.80
4-levee crown rows
10.24 10.10
11.80
14.80
11.14 11.0011.95
12.10
12.9712.43 14.08
15.0013.23
11.449.10
14.0715.35
2.82
10.25
2-levee crown rows
6t 4.70
3-levee crown rows
4t 2.40
50t
32t40t
5.1010t 3.26 5.45
3.04
5.53
3.49
6.62
17.20
20t25t
4.02 5.64
7.59
12.32
8t
6.96
9.388.93
11.0511.2517.42
4.47
7.15
6.43 9.024.10
8.32
Crown width : B'
7.80
10.055.9810.99
8.4311.706.40
6.83
7.16 8.553.767.745.40 9.27
5.15
4.85
7.20
5.906.20
4.104.04
4.964.634.43
6.60
3.84
5.27
Size
80t
8.85
16t
6.10 7.425.35
13.90
7.518.13
7.20
10.509.90
8.40
15.94
16t
10.08
12t
50t40t
64t
32t25t
5.505.20
15.75
12.42
10.5511.43
13.20
6.61 15.54
4.82
14.089.37
5.91
9.80
64t80t
Full face covering methodB'
1 : n
The standard of the block slope is 1:1.3 - 1:2.0.
Required block number N is calculated by the next formula.
V 1 N required block number concrete volume of one blockm3 Total construction volume of RAKUNAm3 void ratio56.5
unitm
10.28 12.28 12.107.10 7.78 9.78 9.6010t 3.00 5.28 7.28
5.77 7.10 7.57 9.06 8.906.16 7.38 7.255.752t 1.80 3.21 4.43
4t 2.20 3.92 5.41 5.256t
3-levee crown rowsB
(common)B'
n=1.3
Layerthickness
: h
6.15
7.84 7.60
6.76
4-levee crown rowsB
(common)B'
6.80
1.3
7.264.30 4.66 5.88
8.36 10.54
6.60 7.20 9.10
vN
6.348t
12t
Size
2.55 4.612.80 4.90
3.20 5.66
9.508.908.868.49 8.30
1.51.5
10.30
5-levee crown rowsB
(common)B'
11.06 13.24
11.2011.4010.59
1.3
13.00
1.5
10.40
2-layer covering methodB'
1 : n B
h
Sloping breakwater form
Calcuration of required block number
The above table is a standard size. We can do this other designs, please feel free to consult.
unitm
10t 5.45 7.59 9.76
2t 3.27 4.59 5.91
25t
16t20t
4.85
4.103.80
50t
6.25
8.5617.65
13.1014.30
12.20
9.7010.60
6t
11.50
8.66 9.15 11.569.90
8.409.00
32t
80t 10.99
11.8613.35 16.8912.46 15.76
8t
40t5.20
4.50
3.55
64t 5.50
16.56
14.0213.10
15.28
13.39
11.5810.62
12.48
14.64
12.20
5.10
Crown width : B'3-levee crown rows
13.0015.30
4t 4.02 5.64 7.26
24.45
16.5018.0018.34
14.0014.20
19.00 20.30 24.00
20.80
14.20
21.19
15.40
6.96 9.80
15.4016.5017.55
6.43 9.02
4.70
19.4518.83
11.30 14.4615.68
12.05
17.94 22.57
18.13
11.61
9.21
10.74
8.53
13.41
19.5019.86
16.81
4-levee crown rows 5-levee crown rows
22.15
15.54 20.01
6.62
13.59
15.99
64t
11.43
13.20
14.73
14.08
12.66
5.91 8.32
7.15
17.0450t10.05
9.05 12.59
Size
10.30 14.45
20t
7.88
9.2810.0110.94
7.226.70
16t12t
9.6580t 6.10
9.3712.42
10.5532t
8.85
25t8.137.51
40t
Full face covering methodB'
1 : n
The side form is set up in the bottom form, and installing the cap of leg.
Casting concrete. Multiplying the vibrator carefully so that the bubble should not occur.
Compacting enough with the vibrator, and the levee crown is finished up.
After the formwork is cleaned enough with the keren stick, and apply the release agent.
Assembling the bottom form, side forms and side form's top.
Fabrication and setting
The special mount is prepared more than 40t type. For 6t-32t type, subsidence prevention components make up 1 set.
1) each plates assembling 2) release agent (oil) spraying 3) bottom plate installation
4) side plates installation 5) concerte casting 6) spacing and leveling
Flow
Please see the construction manual about the security precautions of details and the high-place work, etc.The time of the stripping depends on the strength of stripping examination book.
After casting concrete, it covers with sheet etc. and curing is done until the required strength is filled.
Stripping of the side form. More curing, stripping of the bottom form after required strength is filled.
7) curing 8) demolding side plates 9) demolding bottom plate and lifting to stock yard
10) stock 11) transportation 12) setting
L1(D+a)n1+aS1L+2a for one rowL23.5a(n2-1)+D+1S2L+1 for one rown1the number of block rows of the concrete casting yardn2the number of block rows of the transposition yard
a
aa
a
LD
L1
S1
3.5a500500 50
050
0
L2
S2
Required area of fabricationPlease secure an enough area for the fabrication yard to work safe and efficiently. A required area of the fabrication yard is different depending on the field conditions of the block size, the production volume and the amount of the metal form, etc. This calculation method is general yard arrangement. Please consider the heavy equipment road and the haul road additionally.Please level the yard so as not to cause the warp of the metal form.
Concrete casting yard
Transposition yard
Temporary storage yard (stock yard)temporary storage yard area(m2) = occupation area per one block * K K = total production volume - n1 - n2
Required area of the concrete casting, transposition and temporary storage yard (reference)Required area of the concrete casting, transposition and temporary storage yard (reference)
This table assuming 100 blocks fabrication and 10 metal forms.
Echizen fishing port in Fukui Pref. 64t
2t 0.44 1.617 1.783 22.7 2.5 16.7 2.74t 0.54 1.984 2.189 27.9 3.1 20.2 3.0
6t 0.63 2.315 2.553 32.5 3.6 23.4 3.4
8t 0.68 2.499 2.756 35.1 3.9 25.2 3.5
10t 0.73 2.683 2.959 37.7 4.2 27.0 3.7
12t 0.78 2.866 3.161 40.2 4.5 28.8 3.9
16t 0.86 3.160 3.486 44.4 4.9 31.6 4.220t 0.93 3.417 3.769 48.0 5.3 34.1 4.5
25t 1.00 3.675 4.053 51.6 5.7 36.6 4.7
32t 1.09 4.005 4.418 56.2 6.2 39.8 5.1
40t 1.18 4.321 4.783 60.9 6.7 43.0 5.4
50t 1.26 4.614 5.107 65.0 7.2 45.8 5.764t 1.34 4.907 5.431 69.1 7.6 48.7 6.080t 1.48 5.420 5.999 76.3 8.4 53.7 6.5
2.7 216
2178
2482
319
87 61 4.0 320 468
57 46
1167
1369
15721864
637440
512
672
27953399
816
960
11041312
1536
1752
19762408
966
10.2
12.0
13.816.4
6.4
8.4
133
154
173203
409
468
218
255
295349
113
5.5
24.730.1
233
262
293350
19.2
21.9
Basic dimensions(m)
a
526641
(casting,
transposition,stock yard)
(m2)
117
137
181
80
89
Stock yard(for 100 blocks)
Stock yard area*k (m2)
Occupied area perblock (m2/piece)
Casting yard areaL1*S1 (m2)
Size
Casting yard(for a row composed of 10 blocks)
Transposition yard(for a row composed of 10 blocks)
L2(m) S2(m)Transposition yard
areaL1*S1 (m2)
159 100 7.4 592 851
L D L1(m) S1(m)
738
RAKUNA was developed in 2007. Before now, It was been used more than 300,000t.
64t, Wave absorbing breakwater, Fuji Coast, Shizuoka Prefecture25t, Foot protection works,
Sarahama fishing port, Okinawa Prefecture
50t, Wave absorbing breakwater, Fuji Coast, Shizuoka Prefecture
RAKUNA has been also active in the recovery from the 2011 Tohoku Earthquake Tsunami Disaster.
20t, Wave absorbing breakwater,Hachinohe Port, Aomori Prefecture
HEAD OFFICE17F Nittochi-Nishishinjuku bldg. 6-10-1 Nishishinjuku, Shinjuku-ku, Tokyo 160-0023, Japan
+81-3-3344-6811 [email protected]
INTERNATIONAL DIVISION+81-3-6361-0028 [email protected]
HANOI REPRESENTATIVE OFFICE19F LADECO Build, No.266 Doi Can Str, Lieu Giai Ward, Ba Dinh Dist, Hanoi Vietnam
+84(0)4-37621682 +84(0)[email protected]
Sep.2012-RAKUNA010E-mail.
E-mail.Tel. Fax.
Tel.
Tel. Fax.
Fax. E-mail.