JP2018199961A - Shoal manufacturing method and sediment throwing device - Google Patents

Abstract

To provide a shoal manufacturing method and a sediment throwing device which can form a shoal in a water area with a shallow water depth at high work efficiency, while suppressing diffusion of pollution in throwing sediment into water.SOLUTION: A throwing pipe 2 installed in a floating body 13 is set with bending or inclining from water surface to water bottom and with turning a lower end portion thereof in a lateral direction. Sediment S thrown in an upper end opening 2a of the throwing pipe 2 is discharged from a lower end opening 2b and deposited on the water bottom. In addition, a part of water W flowing inside the throwing pipe 2 toward the lower end opening 2b is returned into the inside of the throwing pipe 2 at a halfway position in a longitudinal direction of the throwing pipe 2, from a vicinity of the lower end opening 2b of the throwing pipe 2 via a lower end opening 3b of a flexible return pipe 3 adjacently installed to the throwing pipe 2 and through the return pipe 3. A circulation flow circulating through the throwing pipe 2 and the return pipe 3 is generated, and a part of floating sediment S is circulated by the circulation flow together with the water W to suppress diffusion of pollution.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shallow field manufacturing method and earth and sand injection device, and more specifically, when the earth and sand are introduced into water, it is possible to form a shallow field in a shallow water area while suppressing the diffusion of pollution and working efficiency. The present invention relates to a shallow field manufacturing method and earth and sand charging apparatus.

  A method of using a double-pipe tremy device when putting earth and sand into a predetermined range of the bottom of a sea or river is known (for example, see Patent Document 1). In such a double pipe tremy device, the water discharged from the lower end opening of the inner pipe rises between the inner pipe and the outer pipe, and a circulating flow that flows into the inner pipe again is generated. When the earth and sand thrown into the inner pipe is discharged from the lower end opening of the inner pipe, a part of the floating earth and sand is circulated by the circulating flow, so that it is possible to suppress the diffusion of the contamination due to the earth and sand that has been thrown in.

  However, since the circulation path of a certain length is required to generate the above-described circulation flow, the conventional apparatus cannot generate a sufficient circulation flow in a shallow water area. Further, in the conventional apparatus, the double pipe is set in a vertical state from the surface of the water to the bottom of the water. Therefore, the range in which earth and sand accumulate on the bottom of the water is limited to the range just below the double pipe. Therefore, in order to deposit earth and sand over a wide area of the water bottom, it is necessary to frequently move the double pipe horizontally, and it has been difficult to improve work efficiency.

JP 2011-69076 A

  An object of the present invention is to provide a shallow-field manufacturing method and a sand-and-sand injection device capable of forming a shallow field in a shallow water area efficiently while suppressing the diffusion of pollution when the sand is thrown into water. It is in.

  In order to achieve the above object, the shallow-field manufacturing method of the present invention is the installation of a charging pipe extending from the water into the water, and a reflux pipe is installed adjacent to the charging pipe, near the lower end opening of the charging pipe. The lower end opening of the reflux pipe is arranged at the same time, and the inside of the reflux pipe is communicated with the inside of the introduction pipe at a position halfway in the longitudinal direction of the introduction pipe, and the introduction pipe is bent or inclined from the water surface toward the bottom of the water. The bottom end of the charging pipe is set in the horizontal direction, and earth and sand are introduced from the upper end opening of the charging pipe, discharged from the lower opening and accumulated on the bottom of the water, and the inside of the charging pipe is directed toward the lower opening. Part of the flowing water is recirculated from the vicinity of the lower end opening of the input pipe to the inside of the input pipe through the lower end opening of the return pipe, and circulates between the input pipe and the return pipe. Generating a circulating flow And features.

  The earth and sand charging device of the present invention comprises a charging pipe installed on a floating body and extending from above the water to the water, and a reflux pipe installed adjacent to the charging pipe, and is located near the lower end opening of the charging pipe. A lower end opening of the reflux pipe is disposed, and the inside of the reflux pipe communicates with the inside of the introduction pipe at a position halfway in the longitudinal direction of the introduction pipe to form a circulation path formed by the introduction pipe and the reflux pipe. The pouring pipe is bent or inclined from the water surface to the water bottom and the lower end portion thereof is set in the horizontal direction, and the earth and sand thrown through the upper end opening of the pouring pipe is set in the pouring pipe. A portion of the water that is discharged from the lower end opening of the pipe and flows inside the input pipe toward the lower end opening passes through the circulation path from the vicinity of the lower end opening of the input pipe through the lower end opening of the reflux pipe. Characterized by a circulating configuration

  According to the present invention, the reflux pipe is installed adjacent to the introduction pipe extending from the water to the water, the lower end opening of the reflux pipe is disposed in the vicinity of the lower end opening of the introduction pipe, and the inside of the reflux pipe is connected to the introduction pipe. A circulation path is formed by the introduction pipe and the reflux pipe by communicating with the inside of the introduction pipe at a position halfway in the longitudinal direction. Then, since the charging pipe is bent or inclined from the water surface toward the water bottom and the lower end portion thereof is set in the horizontal direction, the circulation path can be lengthened even when the water depth is shallow. Therefore, even in a shallow water area, by introducing earth and sand from the upper end opening of the input pipe, it is possible to sufficiently generate a circulating flow that circulates in the circulation path. In the vicinity of the opening at the lower end of the input pipe, part of the suspended sediment is circulated by the circulating flow together with water. Therefore, even if the soil is discharged from the lower end opening of the input pipe, the diffusion of pollution can be suppressed. Moreover, since the earth and sand are discharged laterally from the lower end opening of the input pipe, it becomes easy to deposit the earth and sand in a wide area of the bottom of the water, which is advantageous for forming a shallow field efficiently in a shallow water area.

It is explanatory drawing which illustrates the earth and sand injection apparatus of this invention by a front view. It is explanatory drawing which illustrates the earth-and-sand injection apparatus of FIG. 1 by planar view. It is explanatory drawing which illustrates the process which manufactures a shallow place by a front view. It is explanatory drawing which illustrates the process of FIG. 3 by planar view. It is explanatory drawing which illustrates typically the inside of the injection pipe of FIG. 3 by a longitudinal cross-sectional view. It is explanatory drawing which illustrates the state which rotated the injection pipe of FIG. It is explanatory drawing which illustrates another embodiment of the earth and sand throwing-in apparatus by a front view.

  Hereinafter, a method for manufacturing a shallow field and an apparatus for depositing earth and sand according to the present invention will be described based on the embodiments shown in the drawings.

  The present invention is applied when a shallow field is formed by depositing earth and sand on the bottom of a shallow water area. The depth of the target water area is, for example, about 1 m to less than 5 m, or about 2 m to 4 m. By depositing earth and sand on the bottom of the water, a shallow field having a water depth of about 0.5 m to 2 m is formed.

  1 and 2, the earth and sand charging device 1 of the present invention is installed on a floating body 13 and extends from the surface of the water into the water, and a reflux pipe 3 installed adjacent to the charging pipe 2. It has. The input pipe 2 extends from the floating body 13 while being bent or inclined toward the water bottom, and the lower end portion thereof is set in the lateral direction. This horizontal orientation is not limited to complete horizontal, but includes a direction inclined about 45 ° up and down with respect to the horizontal.

  Therefore, as the input pipe 2 and the reflux pipe 3, a flexible pipe body such as a resin pipe is used. Even if it is a metal tube, if it is a specification with flexibility, such as a bellows tube, it can be used as the input tube 2 or the reflux tube 3. Even if the input pipe 2 and the reflux pipe 3 are not of a specification having flexibility in the entire length, it is only necessary that the lower end portion can be set in the lateral direction with the specification having flexibility in a part of the entire length.

  In order to prevent clogging of the earth and sand S, it is preferable that the inner surfaces of the charging pipe 2 and the reflux pipe 3 have specifications with no irregularities or small irregularities (smooth inner surfaces). In addition, when each of the charging pipe 2 and the reflux pipe 3 is a tube having a constant cross-sectional area in which the cross-sectional area does not change in the longitudinal direction, it becomes easy to smoothly flow the internal water W and earth and sand S.

  In this embodiment, the charging pipe 2 and the reflux pipe 3 are flexible in their entire length, and the reflux pipe 3 extends along the longitudinal direction of the charging pipe 2. And the upper end opening 2a of the injection pipe | tube 2 is connected to the lower end of the hopper 11 mounted in the center part of the floating body 13 by planar view. The input pipe 2 is bent from the surface of the water toward the bottom of the water, and the lower end thereof is set in the horizontal direction (generally in the horizontal direction) along the water bottom. A belt conveyor 12 is disposed above the hopper 11.

  The floating body 13 only needs to be able to stably hold the charging tube 2. In this embodiment, the eight base boats 13a that are rectangular in a plan view are connected in an annular shape, so that a floating body 13 having a cavity in the center in a plan view is formed.

  A lower end opening 3 b of the reflux pipe 3 is disposed in the vicinity of the lower end opening 2 b of the charging pipe 2. The lower end opening 3b can be disposed below the lower end opening 2b, but is preferably disposed on the upper side or the side. It is more preferable to arrange the lower end opening 3b above the lower end opening 2b as in this embodiment.

  The upper end opening 3 a of the reflux pipe 3 is connected to a position in the longitudinal direction of the input pipe 2. Thereby, the inside of the reflux pipe 3 communicates with the inside of the feed pipe 2 at a position in the longitudinal direction of the feed pipe 2, and a circulation path is formed by the feed pipe 2 and the reflux pipe 3. If the length of the circulation path is too small, the circulation flow is difficult to occur. Therefore, in order to lengthen this circulation path, it is preferable that the upper end opening 3a of the reflux pipe 3 is as close as possible to the upper end opening 2a of the charging pipe 2 and is disposed below the surface of the water area.

  Furthermore, it is preferable that the cross-sectional area of the reflux pipe 3 is, for example, 80% to 100% with respect to the cross-sectional area of the input pipe 2. When the size of the cross-sectional area of the input pipe 2 and the reflux pipe 3 is made equal, it becomes easy to generate a sufficient circulation flow. In order to increase the cross-sectional area of the reflux pipe 3, a plurality of the reflux pipes 3 can be provided. When a plurality of reflux pipes 3 are provided, the total cross-sectional area of each of the reflux pipes 3 is preferably 80% to 100% with respect to the cross-sectional area of the input pipe 2.

  In this embodiment, an openable / closable lid 4 is installed in the lower end opening 2b. The open / close lid 4 can be optionally provided. A wire 8b is connected in the vicinity of the lower end opening 2b. The wire 8b is wound and fed out by a winch 8a installed on the floating body 13. When the wire 8b is wound by the winch 8a, the lower end opening 2b moves upward, and when the wire 8b is fed by the winch 8a, the lower end opening 2b moves downward. Accordingly, the winch 8a and the wire 8b serve as a vertical movement mechanism 8 that moves the lower end opening 2b up and down. The vertical movement mechanism 8 can be arbitrarily provided.

  The midway of the wire 8a is supported by being wound around a support roller 9. The support roller 9 can be fixed at a predetermined position with respect to the carriage 13, but in this embodiment, the support roller 9 is attached to the tip of the support rod 10. The rear end of the support rod 10 is rotatably attached via a hinge, and the support rod 10 can be raised and lowered. Further, the support rod 10 has a telescopic structure, and its length can be changed.

  The turntable 6 is placed on the floating body 13. The lower surface of the center part of the turntable 6 is a recess 6a. The peripheral surface of the recess 6 a engages with the engaging portion 13 b protruding from the upper surface of the floating body 13, so that the rotating disk 6 can rotate around the central portion of the floating body 13 in plan view.

  A drive motor 7 fixed on the base boat 13 is in contact with the outer peripheral surface of the turntable 6. By rotating the drive motor 7, the turntable 6 rotates. The winch 8, the support rod 10, and the hopper 11 are fixed to the turntable 6. Therefore, the upper end portion of the charging pipe 2, the hopper 11, the winch 8, the support roller 9, and the support rod 10 rotate together with the rotating disk 6.

  When the upper end portion of the input tube 2 rotates together with the turntable 6, the horizontal position of the lower end opening 2b of the input tube 2 changes. Therefore, the turntable 6 and the drive motor 7 serve as a rotation mechanism 5 that rotates the lower end opening 2b in the horizontal direction. The rotation mechanism 5 can be provided arbitrarily.

  The procedure of the method for producing the shallow field of the present invention is exemplified below.

  The floating body 13 in which the earth and sand charging device 1 is installed is moved to the construction target water area and moored, and the earth and sand charging apparatus 1 is arranged in the construction target water area. In this water area, the charging pipe 2 is extended from above the water. Then, the vertical movement mechanism 8 is operated to bend or incline the charging tube 2 as illustrated in FIGS. 1 and 2 and set the lower end portion thereof in the lateral direction. With the charging pipe 2 set in this way, the lower end opening 3b of the reflux pipe 3 is disposed in the vicinity of the lower end opening 2b of the charging pipe 2, and the inside of the reflux pipe 3 is located in the middle in the longitudinal direction of the charging pipe 2 And communicates with the inside of the charging pipe 2.

  It is preferable that the lower end portion of the charging pipe 2 is positioned slightly above the bottom of the water so as not to contact the bottom of the water, and is set in a direction within 15 ° up and down with respect to the horizontal. At this time, the support roller 9 is positioned at an appropriate position by adjusting the length and undulation angle of the support rod 10 so that the wire 8b does not contact the floating body 13.

  Next, as illustrated in FIGS. 3 and 4, the earth and sand S are repeatedly put into the hopper 11. As in this embodiment, the earth and sand S can be input using the belt conveyor 12 or can be input using a bucket or the like. The earth and sand S introduced into the hopper 11 enters the inside of the introducing pipe 2 from the upper end opening 2a of the introducing pipe 2 and flows toward the lower end opening 2b. The flowing earth and sand S presses and opens the opening / closing lid 4 and is discharged to the outside through the lower end opening 2b. The earth and sand S discharged from the lower end opening 2b accumulates on the water bottom in the lateral direction of the lower end opening 2b.

  Here, when the earth and sand S is introduced into the introduction pipe 2, the density of the water W (mixed water with the earth and sand S) inside the introduction pipe 2 becomes larger than the density of the surrounding water W. As illustrated, the water level inside the charging pipe 2 is lowered. When the water surface inside the charging pipe 2 is lower than the upper end opening 3a of the reflux pipe 3, the water W existing in the reflux pipe 3 flows into the charging pipe 2 through the upper end opening 3a.

  In the vicinity of the lower end opening 2b, the water W discharged from the lower end opening 2b diffuses outside, but part of the water W flows into the lower end opening 3b. In this way, a part of the water W flowing inside the charging pipe 2 toward the lower end opening 2b is recirculated from the vicinity of the lower end opening 2b through the lower end opening 3b of the reflux pipe 3 to the inside of the charging pipe 2 through the reflux pipe 3. To do. As a result, a circulating flow is formed with the charging pipe 2, the reflux pipe 3, and the circulation path.

  The lowered water surface inside the input pipe 2 rises by reaction, and since this decrease and increase are repeated, the water surface inside the input pipe 2 fluctuates up and down. And if the new earth and sand S is thrown into the introducing pipe 2 before the earth and sand S thrown into the introducing pipe 2 is discharged | emitted from the lower end opening 2b, this circulation flow will continue without interruption.

  In the vicinity of the lower end opening 2b of the input pipe 2, a part of the floating sand S is circulated through the circulation path (the input pipe 2 and the return pipe 3) together with the water W by the circulating flow, so the earth S is discharged from the lower end opening 2b. Can suppress the diffusion of pollution. Since the fine earth and sand S causing the pollution is likely to float upward, if the lower end opening 3b is arranged above the lower end opening 2b as in this embodiment, the fine earth and sand S can be easily circulated to suppress the diffusion of the pollution. Will become more and more advantageous.

  In addition, in the present invention, the input pipe 2 is bent or inclined from the water surface toward the water bottom and the lower end portion thereof is set in the horizontal direction, so that the circulation path can be lengthened even when the water depth is shallow. Therefore, even in a shallow water area, by introducing the earth and sand S from the upper end opening 2a of the input pipe 2, a circulating flow circulating in the circulation path can be sufficiently generated. In the water region where the water depth from the water surface to the water bottom is 1 m or more and less than 5 m, the length of the input pipe 2 and the reflux pipe 3 may be set to 1 m or more longer than the water depth, more preferably 2 m or more longer.

  Furthermore, in the present invention, the earth and sand S are discharged laterally from the lower end opening 2b. Therefore, compared with the conventional apparatus which discharges the earth and sand S vertically downward, the present invention makes it easier to deposit the earth and sand S over a wide range of the bottom of the water, and is advantageous for forming a shallow field efficiently in a shallow water area. Become.

  In this embodiment, the opening / closing lid 4 prevents the earth and sand S from being discharged from the lower end opening 2b to the outside at an excessive discharge speed. Therefore, it is advantageous to suppress the diffusion of pollution due to discharged earth and sand S.

  In this embodiment, as illustrated in FIG. 6, the horizontal position of the lower end opening 2 b of the charging pipe 2 is changed using the rotation mechanism 5, and the earth and sand S is discharged from the lower end opening 2 b at each changed position. can do. Therefore, since the earth and sand S can be deposited in a relatively wide range without moving the floating body 13, a shallow field can be formed more efficiently.

  In this embodiment, the lower end opening 2b can be rotated 360 ° about the hopper 11 in plan view, but the rotation angle is not limited to this. For example, the rotation angle of the lower end opening 2b may be about 30 ° to 90 °, and may be configured not to rotate. If this rotation angle is zero or small, the support rod 10 can be omitted.

  As the rotation mechanism 5, for example, the upper end opening 2a of the charging pipe 2 can be rotatably attached to the lower end of the hopper 11, and a moving device such as a crane for moving the lower end opening 2b can be provided. With this moving device, the lower end opening 2b can be rotated to a desired horizontal position around the hopper 11.

  In this embodiment, the vertical movement mechanism 8 is used to change the vertical position of the lower end opening 2b of the charging pipe 2 according to the position of the water bottom, and the soil S is discharged from the lower end opening 2b at each changed position. can do. Therefore, since the earth and sand S can be deposited evenly over a relatively wide range, it is advantageous to form a flat shallow field.

  If water W is poured into the upper end opening 2a of the charging pipe 2 together with the sand S, it is advantageous to prevent clogging of the earth and sand S in the charging pipe 2. For example, the water W in the water area is sucked up by a pump or the like and introduced into the hopper 11.

  After finishing the loading of the earth and sand S at the position where the floating body 13 is moored, the floating body 13 is moved to another position and moored, and similarly, the earth and sand S is thrown into the bottom of the water. The creation of the shallow area is completed by carrying out the entire range of the water area subject to this work.

  The embodiment of the earth and sand charging apparatus 1 illustrated in FIG. 7 is different from the previous embodiment only in the reflux pipe 3. In this embodiment, a charging pipe 2 is inserted into the reflux pipe 3, and a double pipe is formed in which the charging pipe 2 is an inner pipe and the reflux pipe 3 is an outer pipe. In this embodiment, the structure can be simplified, and the cross-sectional area of the reflux pipe 3 (the cross-sectional area between the outer peripheral surface of the input pipe 2 and the inner peripheral surface of the reflux pipe 3) can be easily increased. .

DESCRIPTION OF SYMBOLS 1 Sediment injection apparatus 2 Input pipe 2a Upper end opening 2b Lower end opening 3 Reflux pipe 3a Upper end opening 3b Lower end opening 4 Opening / closing lid 5 Turning mechanism 6 Turning board 6a Recess 7 Driving motor 8 Vertical movement mechanism 8a Winch 8b Wire 9 Support roller 10 Support Rod 11 Hopper 12 Belt conveyor 13 Floating body 13a Carrier ship 13b Engagement part S Earth and sand

Claims (12)

A charging pipe is installed extending from the water into the water, a reflux pipe is installed adjacent to the charging pipe, a lower end opening of the reflux pipe is disposed in the vicinity of a lower end opening of the charging pipe, and the reflux pipe The inside of the inlet pipe is communicated with the inside of the inlet pipe at a position in the longitudinal direction of the inlet pipe, the inlet pipe is bent or inclined from the water surface toward the bottom of the water, and the lower end portion thereof is set sideways,
Sediment is introduced from the upper end opening of the input pipe, discharged from the lower end opening and deposited on the bottom of the water, and a part of the water flowing in the input pipe toward the lower end opening is partly removed from the lower end of the input pipe. A method for manufacturing a shallow field, wherein a circulating flow is circulated between the charging pipe and the reflux pipe by causing the reflux pipe to return to the inside of the charging pipe through the reflux pipe from the vicinity of the opening through the lower end opening of the reflux pipe. .   The depth of the water from the said water to the said water bottom is 1 m or more and less than 5 m, The manufacturing method of the shallow field of Claim 1 which sets the length of the said injection | throwing-in pipe and the said reflux pipe to 1 m or more longer than the previous water depth.   The method for manufacturing a shallow field according to claim 1 or 2, wherein the horizontal position of the lower end opening of the charging pipe is changed, and the earth and sand are discharged from the lower end opening at each changed position.   The method for producing a shallow field according to any one of claims 1 to 3, wherein the vertical position of the lower end opening of the charging pipe is changed according to the position of the water bottom, and the earth and sand are discharged from the lower end opening at each changed position. .   The method for manufacturing a shallow place according to any one of claims 1 to 4, wherein water is poured into the upper end opening of the charging pipe together with the earth and sand.   A charging pipe installed in the floating body and extending from above the water to the water, and a reflux pipe installed adjacent to the charging pipe, the lower end opening of the reflux pipe is disposed in the vicinity of the lower end opening of the input pipe, The inside of the return pipe communicates with the inside of the input pipe at a position in the longitudinal direction of the input pipe, and has a circulation path formed by the input pipe and the return pipe, and the input pipe is And bent or inclined from the bottom to the bottom of the water, and the lower end thereof is set in the horizontal direction, and the sand introduced from the upper end opening of the input pipe is discharged from the lower end opening of the input pipe. A part of the water flowing inside the charging pipe toward its lower end opening circulates in the circulation path from the vicinity of the lower opening of the charging pipe through the lower end opening of the reflux pipe. Sediment throwing device.   The sediment injection device according to claim 6, wherein a water depth from the surface of the water to the bottom of the water is 1 m or more and less than 5 m, and a length of the input pipe and the reflux pipe is set to be 1 m or more longer than a water depth.   The earth and sand throwing-in apparatus of Claim 6 or 7 provided with the rotation mechanism which rotates the lower end opening of the said injection pipe in a horizontal direction.   The earth and sand throwing-in apparatus in any one of Claims 6-8 provided with the up-and-down moving mechanism which moves the lower end opening of the said throwing pipe up and down.   The earth and sand injection | throwing-in apparatus in any one of Claims 6-9 by which the lower end opening of the said reflux pipe is arrange | positioned at the upper side or the side of the lower end opening of the said injection pipe.   The earth and sand injection according to any one of claims 6 to 10, wherein the input pipe is inserted into the return pipe, and a double pipe is formed with the input pipe as an inner pipe and the return pipe as an outer pipe. apparatus.   The earth and sand injection device according to any one of claims 6 to 11, wherein a cross-sectional area of the reflux pipe is set to 80% to 100% with respect to a cross-sectional area of the input pipe.

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