Field Investigations on Wave-Dissipating Concrete Blocks Covering Vertical Wall Breakwater

1997 ◽  
Author(s):  
Michio Gomyoh ◽  
Kazuhiko Sakai ◽  
Tomotuka Takayama ◽  
Kojiro Suzuki ◽  
Shigeo Takahashi
Keyword(s):  
Vertical Wall ◽  
Field Investigations ◽  
Concrete Blocks

scholarly journals EXPECTED DISCHARGE OP IRREGULAR WAVE OVERTOPPING

1968 ◽  
Vol 1 (11) ◽  
pp. 54 ◽  
Author(s):  
Senri Tsuruta ◽  
Yoshimi Goda
Keyword(s):  
Vertical Wall ◽  
Laboratory Data ◽  
Irregular Waves ◽  
Linear Summation ◽  
Wave Overtopping ◽  
Irregular Wave ◽  
Concrete Blocks ◽  
Vertical Walls ◽  
Expected Values ◽  
Sea Wall

An experiment was carried out on the overtopping of mechanically generated irregular waves over vertical walls. The experimental discharge was almost in agreement with the expected discharge which had been calculated with the wave height histogram and the data of regular wave overtopping based on the principle of linear summation. The expected values of overtopping discharge were calculated for various laboratory data, which had been represented in a unified form of non-dimensional quantities. The calculation has yielded two diagrams of expected overtopping discharge, one for the sea wall of vertical wall type and the othei for the sea wall covered with artificial concrete blocks.

scholarly journals THE STRUCTURAL BEHAVIOUR AND THE SHELTERING EFFICIENCY OF THE SUBMERGED BREAKWATER AT THE ENTRANCE TO THE PORT OF LEIXOES MAINTENANCE CHARGES AND EFFECTS

1964 ◽  
Vol 1 (9) ◽  
pp. 38
Author(s):  
Duarte Abecasis
Keyword(s):  
Vertical Wall ◽  
Structural Behaviour ◽  
Sandy Bottom ◽  
Submerged Breakwater ◽  
Rocky Bottom ◽  
Model Study ◽  
Concrete Blocks ◽  
New Type ◽  
The Cost ◽  
Conventional Type

The urgent necessity for providing a system of protective works of the harbour of Leixoes with complementary works to improve the poor con ditions of the shelter in the basin and to protect ships entering the port became evident in 193^* In fact, the frequency of disaster to trawlers and to other ships within the basin during southwestern gales as well as the very dangerous conditions at the entrance under such gales were incompatible with the increasing economic importance of Oporto and its hinterland. These bad conditions culminated in the foundering of the 9000 T Dutch steamship "Orania" at anchor in the basin colliding on the 19th December 193^ with the steamship "Luanda" when entering the harbour under severe hurricane. The construction of the 1000 m long new breakwater was started wit a 15 m wide vertical wall to be set partly on rocky bottom and partly o a sandy bottom. Before leaving the rocky bottom the upper part of the wall was destroyed by a strong gale (Fig. l). For the advancement of t work the contractor and an official commission recommended the adoption of the Casablanca type of slope work. For economical reasons and on those of the sure possibility of its conversion into a conventional type of work, would it become convenient it was decided, at the author's suggestion, and after model study at Lausanne School of Engineer's Laboratory, to adopt a new type of submerged work, to replace the unsuccessful vertical type or the type of Casablanca proposed by the contractor (Fig. 2). The section adopted coi prised a rubble mound core of stones to 1• with the crest at level (-9m00), and berms of rubble to kF, 12 m wide to the sea side and 10 m wide to the port side (Fig. l). T The top and slopes of the mound were protected by an armour of 90 concrete blocks with the corners cut for best accommodation. The cost of the work could be reduced to half of that corresponding to the last of these types of breakwaters and its maintenance charge greatly reducec The estimated cost of the works would be reduced from JL 1.770.000 to £. 880.000 and the maintenance charges foreseen reduced from £ 35*^00 yearly to £ 2.800 yearly (comparison with the Casablanca type).

Field Investigations in Surf Zones

1974 ◽  
Author(s):  
Hans Henning Dette ◽  
Alfred Führböter
Keyword(s):  
Field Investigations

Use of Foam Polystyrene Waste in the Conditions of a Reinforced Concrete Products Factory

2020 ◽  
pp. 49-52
Author(s):  
S.E. YANUTINA ◽  
Keyword(s):  
Reinforced Concrete ◽  
Precast Concrete ◽  
Expanded Polystyrene ◽  
Insulation Material ◽  
Design Strength ◽  
Foam Polystyrene ◽  
Secondary Use ◽  
Concrete Blocks ◽  
Polystyrene Waste ◽  
Factory Laboratory

The relevance of research in the factory laboratory of JSC «198 KZHI», which is part of the HC GVSU «Center», is dictated by the need to dispose of foam polystyrene waste that occurs in large quantities when producing the precast concrete. In the production of three-layer external wall panels, polystyrene heatinsulating plates of the PPS 17-R-A brand are used as an effective insulation material. The secondary use of PPS 17-R-A for its intended purpose, as a heater, is not possible. The volume of foam polystyrene produced varies from 25 to 45 m3 per month. Utilization (disposal) of foam polystyrene waste is an expensive undertaking. Its use as a filler in the production of expanded polystyrene blocks was tested in the factory’s laboratory to produce foam polystyrene concrete with specified physical and mechanical characteristics. The results of testing of expanded polystyrene concrete of classes B2.5 and B 7.5 are presented. It is shown that under the conditions of the reinforced concrete factory technology, the production of polystyrene concrete blocks is possible with the achievement of the design strength. The information presented in the article is aimed at motivating specialists who produce recast concrete to the possibility of using foam polystyrene waste for low-rise construction. Keywords: foam polystyrene, ecology, energy efficiency, foam polystyrene concrete, foam polystyrene heat insulation plates, precast concrete.

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