JP5335955B2 - Grab bucket for dredging construction - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a grab bucket for dredging work that can easily discharge residual water in a shell scooped together with earth and sand when the shell is closed and the earth and sand are scooped out.

  In dredging work, the thickness of the layer to be dredged is first determined, and dredging work is carried out in multiple steps at the same place for thick sand and the like that are difficult to dredge at once. In such a case, in the final finishing dredging work, the remaining soil layer is thin, and when dredging work is performed, a lot of water often enters the shell.

  Also, in dredging work for removing contaminated sediment, a lot of water often enters the shell in order to drastically reduce the soil thickness.

  In this way, when a lot of water is contained in the shell, if the shell is pulled up to the surface of the water and the water in the shell is drained, and then the sediment in the shell is accumulated, it takes time to drain and浚 渫 Work cannot be done quickly and work efficiency is very poor.

  It is also possible to raise soil and sand containing a lot of water to the surface of the water and accumulate it quickly without draining it sufficiently, and then perform the next dredging work. There is a problem that a lot of time and cost must be spent on muddy water treatment.

  In recent years, in a dredging work using a grab bucket, a sealed grab bucket is often used. In general, a sealed grab bucket, after scrubbing the earth and sand, until the water is pulled up to the surface of the water, dirt and water inside the shell hardly leaks to the outside. There is no.

  However, when a sealed grab bucket is used, the water in the shell must be discharged to the outside after the shell is opened until the earth and sand are scooped out. It is difficult to leave water inside the shell, and when the shell is closed after the sand and sand are scooped up, the shell is highly sealed, and almost no excess water in the shell is discharged outside the shell. Drainage, etc. will be more problematic.

  With respect to the problems of such a sealed grab bucket, an upper frame supported by the bucket moving means, a lower frame supported via an opening / closing operation means that moves up and down relative to the upper frame, A pair of shells supported by the lower frame via a pivot shaft and pivotable in the opening and closing directions around the pivot shaft, and between the shell and the upper frame. The arm includes a connected arm and an upper closing lid that closes the upper open portion when the both shells are gripped, and the shells are opened and closed by moving the lower frame up and down relative to the upper frame by the opening and closing operation means. In the sealed grab bucket, the upper closing lid is located in the upper opening when each shell is gripped, and the base end side of the upper closing lid is connected to the arm connection of the shell. The upper surface of each upper closing lid and the arm are connected with an interlocking link, and the relative angle between the shell and the arm during the operation in the closing direction side of the two shells is connected. There is a sealed grab bucket characterized in that both upper closing lids are rotated downward by change (see, for example, Patent Document 1).

  In this sealed grab bucket, a lid (upper closing lid) that can be opened and closed toward the outside is provided at the upper end of each shell. Therefore, when grabbing earth or sand, the upper closing lid opens to the outside. In addition, the water can be discharged, and the upper closing lid is closed after grabbing the earth and sand, so that the airtightness can be maintained.

  However, this sealed grab bucket does not forcibly drain the residual water in each shell to the outside, but simply opens and closes the top lid (top closure lid) so as not to hinder drainage. Because it is a thing, it does not lead to sufficient drainage.

  Further, this sealed grab bucket can change the grab capacity by providing a plurality of types of upper closing lids and interlocking links with different lengths (see Patent Document 1, claim 4). When the upper closing lid and the interlocking link are exchanged so that the capacity is reduced, the space enclosed by the upper surface of the upper closing lid and the inner surface of the upper part of the shell is generated in the upper part of the shell as the grab capacity is reduced. When the grab is pulled up with the remaining water filled and the sediment in the shell is accumulated (drained), the remaining water is also accumulated together. The effect of eliminating this does not occur.

JP 2011-84372 A

  In view of the above-described problems, the present invention provides a dredging construction grab bucket that can surely drain residual water in each shell in a short time and that is not a sealed grab bucket but also has an effect of preventing water pollution. This is the issue.

  As a result of intensive studies to solve the above problems, the present inventor has obtained an upper support member suspended by a support wire, an arm member having one end pivotally supported by both ends of the upper support member, A shell that is pivotally supported on the other end of the arm member and has an open upper end, and a lower support in which an end of each shell is pivotally supported below the upper support member and an open / close wire is connected In a grab bucket for dredging construction consisting of members, a bag that is inflated in each shell in order to push the water in the upper part of each shell outward from the open upper end of each shell when both shells are closed and soil and sand are scooped If the body is installed at the upper part in each shell and the upper stopper member and the lower stopper member for suppressing the vertical movement of the inflated bag body are provided at the upper part of each shell, With the bag inflated in the above, the water in the upper part of each shell is forcibly discharged to the outside, so that reliable drainage can be performed in a short time, so that dredging work can be performed efficiently. Since it is performed near the bottom of the water during the dredging operation, it does not sprinkle dirty water in the process of pulling the shell above the water surface, and it is not a sealed grab bucket, but by covering the upper end of the opening with a bag They found out that they can be pulled up with the earth and sand securely held up to the surface of the water.

That is, the present invention includes an upper support member suspended by a support wire, an arm member having one end pivotally supported at both ends of the upper support member, and a pivot support rotatably supported at the other end of the arm member. A grab bucket for dredging construction comprising a shell having an open upper end and a lower support member pivotally supported below the upper support member and connected to an opening / closing wire.
In order to push out the water in the upper part of each shell from the upper open end of each shell to the outside when scooping earth and sand etc. by closing both shells, a bag body to be inflated in each shell is installed at the upper part in each shell. And an upper stopper member and a lower stopper member that suppress the movement of the inflated bag body in the vertical direction are provided on the upper part of each shell, respectively.

  Furthermore, if a water permeable plate body on which the bag body is placed is slidably provided in each shell between the upper stopper member and the lower stopper member, the bag body does not come into direct contact with earth or sand. Therefore, it is preferable that the bag body can be prevented from being damaged, and if the bag body is inflated with air or liquid, the bag body can be quickly inflated simply by press-fitting air or liquid from above the water surface. Therefore, the dredging operation can be performed quickly, and in particular, when air is press-fitted, the shell or the like can be easily lifted by the buoyancy of the bag inflated with air, which is preferable.

  The grab bucket for dredging construction according to the present invention includes an upper support member suspended by a support wire, an arm member rotatably supported at both ends of the upper support member, and an arm member at the other end of the arm member. Dredging construction comprising shells that are rotatably supported and open at the upper ends, and lower support members that rotatably support the end portions of the shells below the upper support members and to which open / close wires are connected. This is a grab bucket for each shell, and in order to push out the water in the upper part of each shell to the outside from the upper open end of each shell when scooping earth and sand etc. by closing both shells, a bag body inflated in each shell An upper stopper member and a lower stopper member that are installed at the upper portion of the inside and suppress the movement of the inflated bag body in the vertical direction are provided at the upper portion of each shell. With the bag inflated in the above, the water in the upper part of each shell is forcibly discharged to the outside, so that reliable drainage can be performed in a short time, so that dredging work can be performed efficiently. Since it is performed near the bottom of the water during the dredging operation, it does not sprinkle dirty water in the process of pulling the shell above the water surface, and it is not a sealed grab bucket, but by covering the upper end of the opening with a bag It is possible to pull up the soil and the like while securely holding it up to the surface of the water.

  Furthermore, in the aspect in which the water-permeable dish body on which the bag body is placed is slidably provided in each shell between the upper stopper member and the lower stopper member, the bag body is in direct contact with earth and sand. It is preferable that the bag body can be prevented from being damaged, and in the embodiment in which the bag body is a bag body inflated with air or liquid, the bag body can be quickly removed by simply press-fitting air or liquid from above the water surface. Since the bag can be inflated, the dredging operation can be performed quickly. In particular, when air is press-fitted, the shell or the like is easily lifted by the buoyancy of the bag inflated with air, which is preferable.

It is front explanatory drawing which shows one Example of the grab bucket for dredging construction concerning this invention. It is a front view explanatory drawing which shows the state which is scooping up earth and sand etc. with the grab bucket for dredging construction of FIG. It is front view explanatory drawing which shows the state which scooped up earth and sand etc. with the grab bucket for dredging construction of FIG. It is a partial cross section explanatory drawing of the shell currently used for the grab bucket for dredging work of FIG. FIG. 4 is a partial cross-sectional explanatory view showing a state in the shell in FIG. 3. FIG. 6 is a partial cross-sectional explanatory view showing a state in which air or the like is injected into the bag body in the state of FIG. 5 and water in the shell is drained to the outside.

  Hereinafter, the dredging construction grab bucket according to the present invention will be described in detail with reference to the drawings.

  An upper support member 1 is suspended by a support wire W1, and an arm member 2 is pivotally supported at both ends of the upper support member 1 at both ends. Reference numeral 3 denotes a shell that is rotatably supported on the other end of the arm member 2 and has an open upper end. Reference numeral 4 denotes an end portion of each shell 3 that is rotatably supported below the upper support member 1 for opening and closing. It is a lower support member to which the wire W2 is connected. The shell 3 in the present invention is opened and closed by opening / closing means constituted by the opening / closing wire W2, the lower support member 4 and the like as shown in FIGS. It is also possible to use an opening / closing means using a general hydraulic mechanism having

  The grab bucket for dredging construction according to the present invention includes an upper support member 1 suspended by a support wire W as described above, an arm member 2 pivotally supported by the upper support member 1, and a shell 3 pivotally supported by the arm member 2. Since it is basically composed of the lower support member 4 and the like to which the opening / closing wire W2 is connected, and is characterized by the structure of the shell 3 as will be described later, many components are conventional. Can be used as is.

  Reference numeral 5 denotes a bag body inflated in each shell 3. This bag body 5 is used to push out the water in the upper part of each shell 3 from the open upper end of each shell 3 to the outside when scooping earth and sand etc. by closing both shells 3 and installed in the upper part in each shell 3 Has been. If this bag body 5 is a bag body that is inflated with air or liquid, it can be quickly inflated simply by press-fitting air or liquid from the surface of the water, so that dredging work can be performed quickly, especially when air is injected. In this case, the shell or the like can be easily pulled up by the buoyancy of the bag 5 inflated with air, which is preferable.

  Reference numerals 6 and 7 denote an upper stopper member and a lower stopper member, respectively, for suppressing the movement of the inflated bag body 5 in the vertical direction. The upper stopper member 6 and the lower stopper member 7 are provided on the upper part of each shell 3, respectively. It has been.

  8 is a water-permeable dish body on which the bag body 5 is placed, and this dish body 8 is slidably provided between the upper stopper member 6 and the lower stopper member 7 in each shell 3. Although not shown, the bottom surface of the dish body 8 is formed in a lattice shape with a metal material, or is formed on a wire mesh or the like, so that water permeability is ensured. Moreover, since the bag body 5 does not come into direct contact with earth and sand or the like by using the dish body 8, damage to the bag body 5 can be prevented.

  In order to actually use such a grab bucket for dredging work according to the present invention, firstly, it is investigated how much the bottom of the water needs to be dredged so as to have a predetermined water depth, and this book to be used. The work plan of how many times the work is performed by the grab bucket for dredging work according to the invention is made.

  And in the actual dredging work, as in the normal dredging work, the grab bucket for dredging construction according to the present invention is lowered toward the bottom of the water, the shell 3 is opened largely as shown in FIG. As shown in FIG. 2, the bottom of the water 3 is started to be scooped while the shell 3 is closed, and finally the shells 3 are completely closed as shown in FIG.

  In this case, the inside of the shell 3 is in a state in which the upper portion is filled with the remaining water as shown in FIG. In this state, air or the like is sent from above the water surface to the bag body 5 through an injecting hose, and the bag body 5 is greatly inflated above the shell 3 where there is residual water, thereby discharging the residual water to the outside of the shell 3. (FIG. 6).

  In addition, when dredging the same part several times, in the first dredging work, the shell 3 may be filled with earth and sand and may contain little residual water. The bag body 5 may be slightly inflated in advance, or the normal dredging work may be repeated without inflating, and only the last dredging work that has a high possibility of containing a large amount of excess water is required. 5 may be sufficiently inflated to perform the above drainage operation.

  As the bag body 5 used in this manner, for example, a pneumatic fender often used as a cushioning material between a ship and a quay can be preferably used. In the case of such a pneumatic fender, it is strong and difficult to break, so there are few cases where the bag 5 is broken and the dredging operation is interrupted.

  If the dish body 8 as shown in FIGS. 4 to 6 is provided, the bag body 5 does not come into direct contact with earth and sand, sharp rocks contained therein, or metal waste. It can be made difficult to break.

  Further, although not shown, the bag body 5 may be an assembly in which a plurality of relatively small bags communicate with each other, or an assembly in which each bag can be injected and exhausted (liquid) that is not in communication. In this case, the plurality of bags can be further inflated along the shape of the upper part of the shell, so that the draining effect of the remaining water can be enhanced.

  Moreover, the grab bucket for dredging work according to the present invention can be used in a state where the bag body 5 is inflated to some extent before scooping earth and sand. In this case, the inflated bag body 5 is in the way, making it difficult to drain, but the time for injecting and discharging air or the like is not necessary, and the working efficiency can be improved. In addition, when using the bag body 5 inflated to some extent in advance, in order to ensure drainage from the shell 3 covered with the bag body 5, a groove, a pipe or the like is previously provided between the shell 3 and the bag body 5. It is good to secure a water channel.

DESCRIPTION OF SYMBOLS 1 Upper support member 2 Arm member 3 Shell 4 Lower support member 5 Bag body 6 Upper stopper member 7 Lower stopper member 8 Dish body
W1 support wire
W2 Open / close wire

Claims (3)

An upper support member (1) suspended by a support wire (W1), an arm member (2) rotatably supported at both ends of the upper support member (1), and the arm member (2) A shell (3) that is rotatably supported at the other end of each of the first and second ends, and an end portion of each shell (3) is rotatably supported below the upper support member (1) and an opening / closing wire. In the grab bucket for dredging construction comprising the lower support member (4) to which (W2) is connected,
When both the shells (3) are closed and the soil and the like are scooped, the water in the upper part of each shell (3) is inflated in each shell (3) in order to push the water from the open upper end of each shell (3) to the outside. An upper stopper member (6) and a lower stopper member (7) that suppress the vertical movement of the inflated bag body (5) are installed in the upper portion of each shell (3). Are provided at the upper part of each shell (3), respectively.   A water permeable dish (8) on which the bag (5) is placed is slidably provided in each shell (3) between the upper stopper member (6) and the lower stopper member (7). The grab bucket for dredging construction according to claim 1.   The grab bucket for dredging construction according to claim 1 or 2, wherein the bag body (5) is a bag body inflated with air or liquid.

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