(57) Abstract Topic With sewage work construction and the like, land 20 - 40m intervalWhile so the orbicular shaft digging between the moat and the shaft on side and advancing the sewage workThe manner which lays the tube and the like (metal tubing pressing in construction method) actively the adoptionAnd others the re te it is. With construction, prevention of fall worker and the pedestrian it isThe safe fence is reflected upon around the me and the shaft. As for safe fence, circleIn circumferential direction of casing longitudinal pipe and side flexible pipe of multiple manualsTo install with welding and the hinge etc, after the construction ending, borutona of the hingeTo loosen tsuto and the clamp and etc be withdrawing, in installation dismantlement largeComing job time was required. Solutions As for this device, bottom of longitudinal pipe a certain lengthTo length it does comparatively, cuts half side briefly. This longitudinal pipeThe one where the bottom is long in the inner skin of the orbicular casing, briefer oneApplying to the peripheral face, it makes the vertical standards, to that with the hinge and the clamp sideThe flexible pipe shift, it is something which provides the safe fence. When dismantlingLoosening the hinge and the clamp, to remove the side flexible pipe, the vertical standardsIf it pulls from the steel iron-made orbicular casing and pulls out because it is good, fallIt can install the safe fence for prevention and it can dismantle at brief.
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