Material or article handling – Elevator or hoist and loading or unloading means therefor – With external cooperating movable feeding or discharging means
Patent
1996-07-08
1998-09-15
Werner, Frank E.
Material or article handling
Elevator or hoist and loading or unloading means therefor
With external cooperating movable feeding or discharging means
4141418, 4141412, 198317, 198549, B65G 4100
Patent
active
058070591
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a ready mixed concrete conveying apparatus which can vertically convey ready mixed concrete up to a required height, and which can continuously and quantitatively feed the conveyed ready mixed concrete onto a belt conveyor to continuously and quantitatively supply the ready mixed concrete to a concrete placing position as a target position.
DISCUSSION OF THE BACKGROUND
Ready mixed concrete which is used at a concrete placing position such as a dam is concrete which generally contains large diameter of aggregates and poor mix (the mix proportion of concrete is small). In addition, in most of cases, the ready mixed concrete is required to be conveyed to a relatively high place. For these reasons, use of a concrete pump is not appropriate to forcibly convey the ready mixed concrete. In most of cases, use of a bucket has been adopted for conveyance.
Conveying and placing ready mixed concrete by such a bucket e.g. by use of a tower crane or a cable crane has an advantage in that ready mixed concrete which includes aggregates having relatively large diameters of 80 mm-150 mm and poor mix can be guided and placed to a high position without its properties being degraded. On the other hand, it has disadvantages in that a small placing volume per a unit time lengthens a term of construction work, and that each concrete placing interval widens to crease a problem in terms of thermal stress of placed concrete.
Conveying and placing ready mixed concrete by a bucket using such a tower crane requires an operator skilled in special technique of e.g. crane operation, which means that it is necessary to keep such a skilled operator for a long term.
Conveying and placing ready mixed concrete by use of a cable crane requires many facilities and much labor for stretching a cable, and involves inconvenience wherein the stretch of the cable and the like are accompanied by environmental disruption.
A construction method of conveying ready mixed concrete by dump trucks is good at conveying and placing a large volume of ready mixed concrete for a relatively short time under good placing conditions. On the other hand, such construction method requires that e.g. a cable crane or a tower crane be additionally installed to place dam concrete by these conventional construction methods when dam concrete placing is made at a portion close to the top of a dam with a narrow surface to place dam concrete, or at a riverbed.
A construction method of conveying ready mixed concrete by dump trucks creates problems in e.g. placing dam concrete at a small-scale dam where a surface to place dam concrete is not suitable for dump trucks to run thereon, or placing dam concrete at a sand control dam where a surface to place dam concrete is not suitable for dump trucks to run thereon either.
Taking these problems into account, it has been considered that when dam concrete is placed, a tower with a bucket elevator is installed to place dam concrete by use of the bucket elevator on the tower.
It is predicted that the construction method of placing dam concrete by use of such a bucket elevator offers advantages in that it is possible to convey ready mixed concrete including large diameter of aggregates and having a low slump like the conventional bucket method, and that it is possible to convey more ready mixed concrete to a placing position in comparison with the conventional ready mixed concrete conveyance by use of e.g. a tower crane or a cable crane.
However, when such a bucket elevator is used to place dam concrete, it is supposed that the cost of equipment becomes comparatively high, that it is inconveniently difficult to take out the dam concrete at an arbitrary position because of complexity in operations of e.g. driving portions, and that the cost of maintenance increases in an inconveniently significant manner. It is also predicted that it is necessary to wash many buckets whenever each concrete placing is made.
In addition, it is supposed that the engagement between chains and sprocket wheels,
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Kabuki Construction Co., Ltd.
Werner Frank E.
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