JP2016075139A5

JP2016075139A5 -

Info

Publication number: JP2016075139A5
Application number: JP2015089228A
Authority: JP
Filing date: 2015-04-24
Publication date: 2018-03-22
Anticipated expiration: 2035-04-24

Description

前記拡大掘削刃３０は、図２（ａ）、図３（ａ）等に示すように、前記杭本体１０の軸方向に延びる掘削刃片３１と、この掘削刃片３１を前記螺旋翼２０に取り付ける１対の支持片３２とを備える。１対の支持片３２は、螺旋翼２０の面部を挟み込み且つ前記内筒１２寄りの内端側が螺旋翼２０の面部を軸方向に貫通する枢軸３３により螺旋翼２０に搖動可能に取り付けられる。１対の支持片３２の螺旋翼２０の周縁側の外端部に掘削刃片３１が固定（溶接）される。掘削刃片３１は、枢軸３３を支点として螺旋翼２０に対して搖動（回動）し、螺旋翼２０の周縁から杭本体１０の径方向外側の突出可能である。
As shown in FIG. 2A, FIG. 3A, etc., the enlarged excavation blade 30 includes an excavation blade piece 31 extending in the axial direction of the pile body 10 and the excavation blade piece 31 to the spiral blade 20. And a pair of support pieces 32 to be attached. The pair of support pieces 32 are slidably attached to the spiral blade 20 by a pivot 33 that sandwiches the surface portion of the spiral blade 20 and has an inner end near the inner cylinder 12 passing through the surface portion of the spiral blade 20 in the axial direction. The excavation blade piece 31 is fixed (welded) to the outer end portion on the peripheral side of the spiral blade 20 of the pair of support pieces 32 . The excavation blade piece 31 can swing (rotate) with respect to the spiral blade 20 with the pivot 33 as a fulcrum, and can protrude from the peripheral edge of the spiral blade 20 on the radially outer side of the pile body 10.

図１（ａ）、（ｂ）等に示すように、前記外筒１１の杭頭部上端に位置する前記硬化性流動体供給管６０の外周面の個所にはペイントなどでマーク７０が付けられている。外筒１１が前記内筒１２に対して前記ねじ部１６、１７の１ピッチ分軸方向上方に移動したときにマーク７０が外筒１１の杭頭部内に隠れる。これは外筒１１が内筒１２に対して１回転した結果であり、上述したように、この外筒１１の１回転によって前記拡大掘削刃３０が前記螺旋翼２０の周縁から杭本体１０の径方向外側に突出する。したがって、マーク７０が外筒１１の杭頭部内に隠れたことを観測することにより拡大掘削刃３０が杭本体１０の径方向外側に突出したことを検知することが出来る。 As shown in FIGS. 1A, 1B, etc., a mark 70 is marked with paint or the like on the outer peripheral surface of the curable fluid supply pipe 60 positioned at the upper end of the pile head of the outer cylinder 11. ing. The mark 70 is hidden in the pile head of the outer cylinder 11 when the outer cylinder 11 moves upward in the axial direction by one pitch of the screw portions 16 and 17 with respect to the inner cylinder 12 . This is a result of the outer cylinder 11 rotating once with respect to the inner cylinder 12, and as described above, the rotation of the outer excavating blade 30 causes the diameter of the pile main body 10 from the periphery of the spiral blade 20 by one rotation of the outer cylinder 11. Projects outward in the direction. Therefore, by observing that the mark 70 is hidden in the pile head of the outer cylinder 11, it is possible to detect that the enlarged excavation blade 30 protrudes radially outward of the pile body 10.