Apparatus and method for sinking concrete shaft
AssigneeIcian Engineering Contractors Co., Ltd.
InventorMing-Yang Lan
Life of this patent
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Abstract
A shaft sinking apparatus for sinking a concrete shaft in a pit includes at least one first steel beam disposed to span the concrete shaft, two second steel beams disposed on the first steel beam, at least two tightening units configured to force the second steel beams into abutment against the first steel beam, and at least two jack members provided among the first and second steel beams. When each of the jack members is actuated, the first steel beam is driven by the jack members to move downwardly away from the second steel beams to thereby force a lower surrounding edge of the concrete shaft to sink into a bottom surface of the pit.
Claims11
A shaft sinking apparatus for sinking a concrete shaft which has an upper surrounding edge and a lower surrounding edge, and which is disposed on a bottom surface of a pit beneath a working platform, said shaft sinking apparatus comprising:
- at least one first steel beam extending in a front-rear direction, and for being disposed on the upper surrounding edge to span the concrete shaft;
- two second steel beams extending in a left-right direction, and disposed on said first steel beam to be spaced apart from each other in the front-rear direction;
- at least two first tightening units each of which is configured to tighten a respective one of said second steel beams onto the first steel beam, and each of which includes
- two first tightening bars each having a first upper segment with a first outer threaded surface, and a first lower segment for being fastened to the working platform, said first upper segments of said first tightening bars extending in an upright direction through said respective second steel beam to have said first steel beam disposed therebetween, and
- two first tightening nuts which are provided on of said respective second steel beam, and which respectively have two first inner threaded surfaces configured to be brought respectively into threaded engagement with said first outer threaded surfaces of said first upper segments of said first tightening bars so as to force said respective second steel beam into abutment against said first steel beam;
- and
- at least two first jack members each having a first cylinder which is secured in said first steel beam, and a first piston rod which is received in a respective one of said second steel beams such that when said first piston rod of each of said first jack members is actuated to extend along a first axis in the upright direction from a first retracted position to a first extended position, said first steel beam is driven by said first jack members to move downwardly away from said second steel beams, to thereby force the lower surrounding edge of the concrete shaft to sink into the bottom surface of the pit.
A method for sinking a concrete shaft, comprising the steps of:
- a1) disposing the concrete shaft on a bottom surface of a pit;
- a2) disposing at least one first steel beam on an upper surrounding edge of the concrete shaft to permit the first steel beam to span the concrete shaft in a front-rear direction;
- a3) disposing two second steel beams, which extend in a left-right direction and which are spaced apart from each other in the front-rear direction, on the first steel beam;
- a4) providing at least two first jack members each of which is in a first retracted position, and each of which has a first cylinder secured in the first steel beam, and a first piston rod received in a respective one of the second steel beams, the first piston rod being actuatable to extend along a first axis in an upright direction from the first retracted position to a first extended position;
- b1) after steps a1), a2), a3, and a4), forcing the second steel beams into abutment against the first steel beam;
- and
- b2) after step b1), actuating each of the first jack members from the first retracted position to the first extended position so as to move the first steel beam downwardly away from the second steel beams, to thereby force a lower surrounding edge of the concrete shaft to sink into the bottom surface of the pit.
Dependencies are inferred from the claim text.