| 主权项 |
1. A series of substantially identical attenuating elements, each of said attenuating elements being placed adjacent to another of said attenuating elements with each said attenuating element oriented substantially in a same way, each said attenuating element comprising:
i) a first half attenuating element part made of concrete, and ii) a second half attenuating element part made of concrete, the first half attenuating element part place against the second half attenuating element part, each of the first and second attenuating element parts respectively having a half head part, a half neck part, and a half base part that together define a head part, a neck part and a base part of the attenuating element, wherein, the neck part connects the head part to the base part by one end of the neck part connecting to the head part and another end of the neck part connecting to the base part,
the neck part has a smaller cross-sectional area than a cross-sectional area of the head part and than a cross sectional area of the base part, and in each attenuating element, the head part is positioned over the base part, and each of the half head parts of said attenuating elements share a common first plane, each of the half neck parts of said attenuating elements share a common second plane, and each of the half base parts of said attenuating elements share a common third plane and whereinan interspace is formed between each of the head parts of adjacent attenuating elements, and a channel is formed between each of the neck parts of the adjacent attenuating elements. |
