JP2013057186A - Dredging grab bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dredging grab bucket capable of reducing an amount of spill stream fetched into the bucket when sediment is scooped and obtaining a high mud content.SOLUTION: On a left-right direction center part of cover parts 7, 7 which close upper parts of a pair of left and right shells 2, 2 when the shells 2, 2 are closed, a partition member 8 projecting downwards and extending in a width direction of the shell 2 is provided. Thus, scooped sediment S is fetched so as not to have a gap with the cover part 7 in a dense state between the partition members 8.

Description

  The present invention relates to a dredged grab bucket, and more particularly, to a dredged grab bucket capable of obtaining a high mud content by reducing the amount of residual water taken into the bucket when earth and sand are scooped.

  A grab rod that performs dredging using a grab bucket that is lifted and lowered via a suspension wire by a winch device installed in a work boat or the like is widely known. In this grab dredging, it is difficult to finish the bottom of the water flat, and when finishing digging, thin layer excavation is performed, so the amount of sediment per grip is reduced, and the amount of remaining water in the bucket is increased accordingly. The mud content tends to be low. Therefore, in order to solve this problem, it has been proposed to use a sealed grab bucket in which the maximum digging depth is reduced with a shell wider than usual (see Patent Document 1). By using the proposed grab bucket, the mud content can be improved.

  For example, as shown in FIG. 10, a conventional sealed grab bucket 14 has a pair of left and right shells 2 and 2 rotatably connected to each other by a central support shaft 6a. It is rotatably supported by the support shafts 6b and 6b. On the left and right side surfaces of each shell 2, a through hole 9a for air and water drainage and an opening / closing door 9b for opening and closing it are provided. Then, by raising and lowering the support shaft 6a, the pair of left and right shells 2 and 2 rotate around the support shaft 6b to open and close. When the shells 2 and 2 are closed and the earth and sand S are scooped, the cover portions 7 and 7 provided on the shells 2 and 2 come into contact with each other and the upper portions of the shells 2 and 2 are closed. At this time, residual water W may remain between the scooped earth and sand S and the cover portions 7 and 7. If the amount of the remaining water W is large, extra man-hours and costs are required for the processing. Moreover, since the amount of earth and sand S to be stored at a time is reduced, work efficiency is deteriorated. Therefore, it has been desired to further improve the mud content by reducing the amount of sewage W.

JP 2010-159545 A

  An object of the present invention is to provide a dredged grab bucket capable of obtaining a high mud content by reducing the amount of remaining water taken into the bucket when earth and sand are scooped.

  In order to achieve the above object, the straw grab bucket of the present invention comprises a left shell whose left end is rotatably supported by a support shaft, and a right shell whose right end is rotatably supported by a support shaft. A pair of left and right shells, a connecting shaft for rotatably connecting the shells, a cover portion provided on each shell, and an openable air and drainage mechanism provided on the side surface in the left and right direction of each shell The pair of left and right shells opens and closes to the left and right around the respective support shafts when the connecting shafts are moved up and down, and when the shells are in contact with each other and are closed, the cover portion allows the upper portion of each shell to be opened and closed. In the closed type grab bucket that is closed, a partition member that protrudes downward and extends in the width direction of the shell is provided at the center in the left-right direction of each cover portion. And wherein the door.

  Here, for example, the partition member is formed into a plate-like body. Alternatively, the partition member is a hollow body or solid body having a predetermined width in the left-right direction of the cover portion. The partition member can be configured to be movable in the left-right direction. The tubular body can be extended from the through hole to the partition member, and the through hole can be provided on the side surface of the tubular body. A plurality of the through holes may be provided at intervals in the cylinder axis direction of the cylindrical body, and a lid member that can close a desired through hole among the plurality of through holes may be provided.

  According to the present invention, the partition member that protrudes downward and extends in the width direction of the bucket is provided at the center in the left-right direction of each cover portion that closes the upper part of the shell when the pair of left and right shells are closed. The scooped earth and sand can be taken in between the partition members in a dense state so that there is no gap between them and the cover part. Therefore, it becomes possible to secure a high mud content by reducing the amount of residual water taken into the bucket.

It is a front view which illustrates the grab bucket of this invention. It is a side view of the grab bucket of FIG. It is a front view which illustrates the state where the grab bucket of FIG. 1 opened the shell fully. It is explanatory drawing which illustrates a finish digging process. It is explanatory drawing which illustrates the inside of the shell at the time of scooping earth and sand with the grab bucket of FIG. It is explanatory drawing which illustrates the inside of the shell at the time of providing another partition member and scooping earth and sand. It is a front view which illustrates the state where the grab bucket of another embodiment opened the shell fully. It is explanatory drawing which illustrates the inside of the shell at the time of scooping earth and sand with the grab bucket of FIG. It is a side view of the grab bucket of FIG. It is explanatory drawing which illustrates the inside of the shell at the time of scooping earth and sand with the conventional closed type grab bucket.

  Hereinafter, the straw grab bucket of this invention is demonstrated concretely based on embodiment shown to a figure.

  As illustrated in FIG. 1 to FIG. 3, the sealed straw grab bucket 1 of the present invention (hereinafter referred to as bucket 1) has an upper frame 3 connected to a suspension wire 11 a, Two arms 5 and 5 are rotatably supported at one end portions thereof via a support shaft 6c. The other shells 2 and 2 are rotatably supported on the other ends of the arms 5 and 5 via a support shaft 6b. The upper ends of the shells 2 and 2 are rotatably supported by a support shaft 6 a provided on the lower frame 4. That is, a pair of left and right shells 2, 2 having a left shell 2 rotatably supported by a support shaft 6 b on the left end and a right shell 2 rotatably supported by a support shaft 6 b on the right end. Are rotatably connected to each other by a support shaft 6a.

  The lower frame 4 is moved up and down with respect to the upper frame 3 by an opening / closing wire 11b. When the lower frame 4 is moved downward, the support shaft 6a is moved downward, and the respective shells 2 and 2 are rotated about the support shafts 6b and 6b so that they are opened as illustrated in FIG. Become.

  When the lower frame 4 moved downward is moved upward by the opening / closing wire 11b, the support shaft 6a is moved upward, and the respective shells 2 and 2 are rotated about the support shafts 6b and 6b so as to face each other. It will be in the closed state by contacting the part. Each shell 2, 2 is provided with a cover part 7, 7, and when the pair of shells 2, 2 are closed, the cover part 7, 7 closes the upper part of each shell 2, 2. It is like that.

  In addition, it can also be set as the structure which provides a fixed angle in each shell 2 and 2 and provides the cover part 7 to a fixed angle so that attachment or detachment is possible. By providing fixed angles at a plurality of different positions (up and down positions) or attaching cover portions 7 having different shapes, the bucket capacity can be changed.

  When the pair of shells 2 and 2 are closed, the earth and sand S are taken into the sealed space formed by the pair of shells 2 and 2 and the cover portions 7 and 7. It is preferable to provide a seal member that ensures hermeticity at the mutually opposing portions of the pair of shells 2 and 2. The volume of this sealed space becomes the bucket capacity.

  As illustrated in FIG. 2, the pair of shells 2 and 2 has a width B and a bucket depth d. In addition, open / close doors 9b that open and close through holes 9a formed on the side surfaces are provided on the side surfaces of the respective shells 2 and 2 in the left-right direction. The through hole 9a and the open / close door 9b serve as an open / close type air and water drain mechanism.

  A partition member 8 that protrudes downward and extends in the width direction of the shells 2 and 2 is provided at the center in the left-right direction of each cover portion 7 and 7. In this embodiment, the partition member 8 is a plate-like body, and protrudes from the cover portions 7 and 7 vertically downward (0 ° with respect to the vertical) with the shells 2 and 2 closed. The direction of the partition member 8 can be appropriately set within a range of ± 30 ° with respect to the vertical, for example. The partition member 8 extends substantially over the entire length in the width direction of the shell 2.

  As illustrated in FIG. 4, a crane is provided on the work boat 13, and the suspension wire 11 a is wound and fed by the winch device 12 of the crane. A bucket 1 (upper frame 3) is attached to the hanging wire 11a. Then, using this bucket 1, for example, finishing digging is performed at a finishing depth t. The bucket depth d is larger than the finishing depth t.

  When excavating, the bucket 1 is thrown into the bottom of the water with the pair of shells 2 and 2 being opened as illustrated in FIG. At this time, since the opening / closing door 9b is opened and water passes through the through hole 9a, smooth dropping is possible. At this time, the inside of the pair of shells 2 and 2 is filled with water.

  Next, the pair of shells 2 and 2 are closed and the earth and sand S are scooped with the bucket 1. As illustrated in FIG. 5, earth and sand S are taken into the sealed space formed inside the bucket 1. Since the partition member 8 is provided at the center in the left-right direction of the cover portions 7 and 7, the scooped earth and sand S is taken in between the partition members 8 and 8 in a dense state. Thereby, between the partition members 8 and 8, it will be in the state with which the taken-in earth and sand S were filled between the cover parts 7, with almost no clearance.

  The remaining water W remains on the left side and the right side of the position where the partition member 8 of the right shell 2 is provided from the position where the partition member 8 of the left shell 2 is provided. The lower level of the remaining water W is approximately the same level as the lower end of the partition member 8. Thus, although the residual water W remains in the bucket 1, it becomes possible to reduce the amount of the residual water W compared with the conventional bucket illustrated in FIG. The rate can be secured.

  In order to reduce the amount of remaining water W and improve the mud content, if the length of the cover portion 7 in the state in which the pair of shells 2 and 2 are closed is L, the left-right direction of the partition member 8 The position of each cover portion 7 is more preferably within a range of about 0.3 L to the left and right with respect to the center in the left-right direction of the cover portion 7 (that is, the range width is about 0.6 L). A plurality (for example, two or three) of partition members 8 can be attached to the left and right in the range of 0.3L. In addition, the length of the partition member 8 (the length protruding downward from the cover portion 7) is in the range of about 0.3 to 0.6 times (0.3d to 0.6d) the bucket depth d. It is more preferable.

  The partition member 8 can be fixed to a fixed position of the cover portion 7 by welding or the like. Alternatively, it can be provided so as to be movable in the left-right direction. Moreover, the partition member 8 can be provided with a specification having a different projecting length downward from the cover portion 7, and an appropriate specification can be selected and attached.

  After taking in the earth and sand S, the bucket 1 is pulled up on the water with the pair of shells 2 and 2 closed. At this time, the earth and sand S taken in by the open / close door 9b closing the through hole 9a is prevented from leaking to the outside.

  As described above, according to the present invention, the amount of remaining water W remaining in the bucket 1 can be reduced as compared with the conventional case, which is advantageous in reducing the man-hours and costs for treating the remaining water W. Moreover, since a mud content rate can be improved, it is advantageous also to the improvement of work efficiency.

  The partition member 8 is not limited to a plate-like body, and may be a hollow body or a solid partition member 8a having a predetermined width C in the left-right direction of the cover portion 7 as illustrated in FIG. The predetermined width C is, for example, about 0.1 to 0.3 times (0.1 L to 0.3 L) the length L of the cover portion 7 in the left-right direction. The only difference between the partition member 8a and the partition member 8 of FIG. 5 is that the cross-sectional shape is different.

  When this partition member 8a is provided, a portion where the partition member 8a is provided becomes a dead space, and the scooped earth and sand S is taken in between the partition members 8a and 8a in a dense state as in the previous embodiment. Thereby, between the partition members 8a and 8a, it will be in the state with which the earth and sand S taken in was filled without leaving a clearance gap between the cover parts 7. FIG.

  The remaining water W remains on the left side and the right side of the position where the partition member 8a of the right shell 2 is provided from the position where the partition member 8a of the left shell 2 is provided. The lower level of the remaining water W is approximately the same level as the lower end of the partition member 8a. Therefore, it becomes possible to reduce the amount of the residual water W, and accordingly, a high mud content can be secured.

  A more preferable arrangement of the partition member 8a is the same as that of the plate-like partition member 8 described above. Moreover, the same arrangement as the partition member 8 of the plate-like body described above can also be applied to this partition member 8a.

  In the embodiment illustrated in FIGS. 7 to 9, with respect to the bucket 1 illustrated in FIG. 5, the tubular body 10 is extended from the respective through holes 9 a to the partition member 8, and is formed on the side surface of the tubular body 10. A through hole 10a is provided. The cylindrical body 10 may be cylindrical or rectangular, and one end opening of the cylindrical body 10 is larger in diameter than the through hole 9a and communicates with the through hole 9a, and the other end opening is blocked by the partition member 8. It is.

  In this embodiment, a plurality of through holes 10 a are provided at intervals in the cylinder axis direction of the cylindrical body 10. That is, in a state where the pair of shells 2 and 2 are fully opened, a plurality of through holes 10 a are provided at intervals in the vertical direction of the cylindrical body 10. A lid member 10b that can close a desired through hole 10a among the plurality of through holes 10a is provided. The number, size, and arrangement of the through holes 10a can be determined as appropriate.

  In this embodiment, as illustrated in FIG. 7, when the bucket 1 is thrown into the water bottom with the pair of shells 2, 2 open, the air A and water inside the pair of shells 2, 2 are transferred to the lid member 10 b. Flows out of the shell 2 through the through-hole 10a and the through-hole 9a that are not blocked.

  Next, as illustrated in FIG. 8, the pair of shells 2 and 2 are closed, and the earth and sand S are scooped with the bucket 1. The earth and sand S are taken into the sealed space formed inside the bucket 1. Since the partition member 8 is provided at the center in the left-right direction of the cover portions 7 and 7, the scooped earth and sand S is taken in between the partition members 8 and 8 in a dense state. Thereby, between the partition members 8 and 8, it will be in the state with which the earth and sand S taken in were filled without leaving a clearance gap between the cover parts 7. FIG.

  On the other hand, air A that cannot completely escape from the inside of the shell 2 remains through the through hole 10a and the through hole 9a that are not blocked by the lid member 10b. For example, air A remains in a range surrounded by a broken line in FIG.

  Thereby, when the embodiment of FIG. 8 is compared with the embodiment of FIG. 5, the amount of the remaining water W can be reduced by the amount of the remaining air A. Along with this, the mud content can be improved. That is, in this embodiment, the amount of the remaining water W is reduced by intentionally providing an air reservoir inside the pair of shells 2 and 2.

  If the amount of air A remaining in the pair of shells 2 and 2 is excessive, a large amount of air A leaks during excavation, resulting in turbidity in the water area. When the position of the through hole 10a is changed, or when there are a plurality of through holes 10a, the amount of the remaining air A is changed by changing the position of the through hole 10a closed by the lid member 10b. For example, the amount of air A remaining inside the shell 2 when the pair of shells 2 and 2 are closed increases as the position of the through hole 10a opened in the state of FIG. Therefore, the position where the through hole 10a is provided or the position of the through hole 10a closed by the lid member 10b may be set to an appropriate position according to various field conditions.

  Also in this embodiment, the more preferable arrangement of the partition member 8 is the same as the partition member 8 of the plate-shaped body described above. Further, the same arrangement as that of the partition member 8 of the plate-like body described above can also be applied to this partition member 8.

  The bucket 1 of the present invention can be used not only for finishing excavation but also for normal excavation.

DESCRIPTION OF SYMBOLS 1 Grab bucket 2 Shell 3 Upper frame 4 Lower frame 5 Arm 6a, 6b, 6c Support shaft 7 Cover part 8, 8a Partition member 9a Through hole 9b Open / close door 10 Cylindrical body 10a Through hole 10b Lid member 11a Suspension wire 11b Open / close wire 12 Winch Device 13 Work Ship 14 Conventional Grab Bucket

Claims (6)

  A pair of left and right shells consisting of a left shell whose left end is rotatably supported by a support shaft and a right shell whose right end is rotatably supported by a support shaft, and these shells are rotatable. A connecting shaft to be connected, a cover portion provided on each shell, and an openable air and drainage mechanism for opening and closing a through hole provided on a lateral side surface of each shell, and raising and lowering the connecting shaft As a result, a pair of left and right shells open and close to the left and right around each support shaft, and when the shells come into contact with each other and close, the cover portion closes the upper part of each shell. The bucket grab bucket according to claim 1, wherein a partition member that protrudes downward and extends in a width direction of the shell is provided at a central portion in the left-right direction of each cover portion.   The straw grab bucket according to claim 1, wherein the partition member is a plate-like body.   The straw grab bucket according to claim 1, wherein the partition member is a hollow body or a solid body having a predetermined width in the left-right direction of the cover portion.   The straw grab bucket according to claim 1, wherein the partition member is movable in the left-right direction.   The straw grab bucket according to any one of claims 1 to 3, wherein a cylindrical body is extended from the through hole to the partition member, and a through hole is provided on a side surface of the cylindrical body.   The glazed grab according to claim 5, wherein a plurality of the through holes are provided at intervals in the cylinder axis direction of the cylindrical body, and a lid member capable of closing a desired through hole among the plurality of through holes is provided. bucket.

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