| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete guard fence by which a block in the middle of the lengthwise direction can be removed independently and easily.SOLUTION: A concrete guard fence comprises a lower projecting block 2 in which a lower projecting part 5 is protruded at the lower part of both sides of the lengthwise direction, an upper projecting block 3 in which an upper projecting part 6 arranged on the lower projecting part 5 is protruded at the upper part of both sides of the lengthwise direction, and a steel pipe 15 which connects the lower projecting block 2 with the upper projecting block 3 in a state that the upper projecting part 6 of the upper projecting block 3 is arranged on the lower projecting part 5 of the lower projecting block 2. By releasing the connection by the steel pipe 15, the upper projecting block 3 in the middle can be lifted and removed. By removing the upper projecting blocks 3 and 3 on both sides, the lower projecting block 2 between the upper projecting blocks can be lifted and removed.SELECTED DRAWING: Figure 4 |
