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Fig. 6 shows a graph representing a relationship between the Hudson stability coefficient and the rate of damage depending on the placement of the half-loc. Fig. 7 shows a graph representing a relationship between the Hudson stability coefficient and the rate of damage for the placement of the half-loc shown in Fig. 3 to 5 Fig. 5. Fig. 8 shows a graph representing a relationship of the stability depending on the rate of weigh of the half-loc. The detailed description of this invention would refer the attached drawing,
10 DFTA11 FD DESCRIPTION OF THE PRFFFRIIFD F1ofRODITAFNTS A new form of the middle armor block of a half-loc (hereinafter "half-loe) of an embodiment of this invention is shown in Figs. IA and 1B. The half-loc mainly comprises a body 10 and a leg 14. The body 10 is formed a shape of octagon column with a rectangle side and a perforated hole 12 at the center of the top surface. The 15 perforated hole 12 has a shape of rectangle or preferably a square. Four legs 14 are integrally formed and attached alternatively to the side of the body 10. Alm, a protruding foot 16 is formed at a lower portion and/or upper portion of the leg 14. The protruding foot 16 is disposed upward or downward direction at each of top and bottom of the legs. Each corner of the lower portion and upper portion of no the leg 16 and the foot 14 is chamfered. The perforated hole 12 at the center of the body 10 is designed to pass the water upward or downward to disperse an up-lifting force. The perforated hole 12 has a shape of square. Each side of the perforated hole 12 is parallel to the side of the body, which does not have a leg. The perforated hole 12 is disposed at the center of 25 the top of the body in order to avoid the concentration of the stress. Each foot 16 formed on the top and bottom of the leg 14 will be locked in the upper and lower coated layer rocks of the breakwater or seawall and minimize the slippage. Therefore, it will improve the reinforcement of the upper and lower coated layer rocks and increase the stability of the hydraulic characteristics. Also, the corners of the leg 14 are chamfered 30 to disturb the water flows over the blocks. The detailed dimensions of the half-loo of an embodiment as shown in Fig. IA are shown in Fig. 2. The maximum length of the half-loc is shown in Fig. 2, i.e., a dimension C measured from an outside of the leg 14 to the opposite side of the leg 14 that is assumed 35 a scale of 100. It is favorable dimension of the half-Inc having a thickness of the leg
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