WO2020250885A1

WO2020250885A1 - Dredger

Info

Publication number: WO2020250885A1
Application number: PCT/JP2020/022680
Authority: WO
Inventors: 小島　徳明; 前田　武俊
Original assignee: 株式会社小島組
Priority date: 2019-06-12
Filing date: 2020-06-09
Publication date: 2020-12-17
Also published as: CN113939629B; CN113939629A; EP3985177A1; JPWO2020250885A1; JP7186986B2; EP3985177A4

Abstract

Provided is a dredger in which a wire is hung vertically from a distal end of a boom that is tiltably supported about a pivot on a hull of the dredger and a bucket device is suspended on the wire, the wire being capable of being wound and unwound by a winch device provided on the hull, the dredger being capable of raking in and excavating soil of an underwater bottom with the bucket device and pumping the soil through a soil transport pipe to a soil storage cite above water, wherein: a boom (B) is tiltably supported about the pivot on a hull (1) and is vertically tiltable underwater; and a wire (W) can be wound and unwound by a winch (2) provided on the hull (1) and can be hung vertically from a distal end (Ba) of the boom (B) while the boom is underwater. As a result, excavation can be conducted efficiently utilizing the deadweight of the bucket device, which is an advantage of a bucket device suspended on a wire, while enabling a solution to the problems of a conventional device in which the wire is hung over a long distance from above the water to the underwater bottom.

Description

Dredging work boat

In the present invention, a bucket device is suspended from a dredging work vessel, particularly a boom pivotally supported on the hull, via a wire that can be wound and unwound by a winch device provided on the hull, and the bottom of the water is suspended by this bucket device. It relates to a dredging work vessel that can scrape and excavate the earth and sand of the earth and can be pumped to the earth and sand storage place on the water through the earth and sand transport pipe.

The dredging work vessel described above is conventionally known as disclosed in Patent Document 1 below. In this, a heavy bucket device is suspended by a wire to move up and down, so that the bottom of the water is utilized by utilizing the weight of the bucket device itself. It has the advantage of being able to efficiently scrape and excavate earth and sand.

Japanese Patent Application Laid-Open No. 7-26580

In the dredging work vessel of Patent Document 1, it is necessary to extend a wire for suspending the underwater bucket device downward from the tip of the boom standing on the water to the bucket device near the bottom of the water for the dredging work. The long wire is susceptible to the effects of wind and waves on the water and the tidal current in the water, which causes a problem that the accuracy of position control of the bucket device at the lower end of the wire is not a little lowered. ..

Further, in the conventional dredging work ship, the hull is fixed to the bottom of the water by a fixing means such as a spud to perform the dredging work. Therefore, each time the dredging work range (position) is changed, the fixing means is used. It is necessary to repeatedly perform the work of releasing the operation, moving the hull, and fixing the position after the movement to the bottom of the water again by the fixing means, which is troublesome to change.

The present invention has been proposed in view of the above, and first solves the above-mentioned problems associated with the use of a wire that hangs long from the water surface to near the bottom of the water while taking advantage of the bucket device suspended from the wire. The second purpose is to enable the dredging work to be performed over a wide range and with high accuracy without fixing the hull to the bottom of the water.

In order to achieve the first object, the present invention hangs a wire that can be wound and unwound by a winch device provided on the hull from the tip of a boom that is pivotally supported on the hull. In a dredging work vessel in which a bucket device is suspended from a wire, and the bucket device is used to scrape and excavate the earth and sand on the bottom of the water and pump it to a sediment storage place on the water through a sediment transport pipe, the boom moves up and down in the water. The first feature is that the wire is configured to be tiltable in a direction and the wire can hang down from the tip of the boom in water.

Further, in order to achieve the second object, in addition to the first feature, the present invention can propel the hull along the water surface in order to adjust the horizontal position of the bucket device in water. Based on the device and the GPS position information of at least one of the hull, the boom and the bucket device, the hull propulsion device is provided so that the bucket device can move the excavation target section of the bottom of the water along a predetermined excavation route. The second feature is to include a control device capable of controlling the operation and controlling the position of the hull.

Further, in the present invention, in addition to the first or second feature, the bucket device injects pressurized air and / or pressurized water into the excavated earth and sand that has been scraped into the bucket device. A third feature is that it is provided with a sediment flow assisting device that assists the flow of sediment toward the sediment storage place via the sediment transport pipe.

Further, the present invention has, in addition to any of the first to third features, a fourth feature that the hull is provided with a sediment storage tank serving as the sediment storage place.

According to the first feature, the boom pivotally supported on the hull is configured to be able to tilt in the water in the vertical direction, and the wire unwound from the winch device on the hull hangs down from the tip of the boom in the water and buckets. Since the device is suspended, the hanging length of the wire from the tip of the boom to the bucket device can be sufficiently shortened while taking advantage of the bucket device by suspending the wire, and the wire can be blown on the water surface. It is possible to eliminate or reduce the influence of waves and waves, and the influence of currents in water. As a result, the deviation of the horizontal position of the bucket device with respect to the hull position (hence, the horizontal position of the boom tip) can be reduced, so that the accuracy of the position control of the bucket device based on the position control of the hull (hence the boom) can be improved. Can contribute.

According to the second feature, a hull propulsion device capable of driving the hull along the water surface in order to adjust the horizontal position of the bucket device in water and a control device for controlling the operation of the hull propulsion device are provided and controlled. The device operates the hull propulsion device based on the GPS position information of at least one of the hull, the boom and the bucket device to control the hull position, so that the bucket device sets the excavation target section of the water bottom into a predetermined excavation route. It will be possible to move along. As a result, the bucket device can move the excavation target section of the water bottom along a predetermined excavation route by using the GPS position information as a clue without fixing the hull to the water bottom. Therefore, the bucket device can be used over a wide range of the water bottom. The dredging work can be performed evenly. Moreover, the position control of the bucket device during this dredging work is accurate due to the effect of eliminating or making it difficult to receive the influence of waves and tidal currents by hanging the wire from the tip of the boom in water as described above. It will be possible to execute well.

According to the third feature, by injecting pressurized air and / or pressurized water into the excavated earth and sand that has been scraped into the bucket device, the flow of earth and sand from the bucket device to the earth and sand storage place via the earth and sand transport pipe is assisted. Since it is equipped with a sediment flow assisting device, even if the bucket device is left in the water, the excavated sediment that has been scraped into the bucket device is diffused to increase the fluidity, and it is smoothly forced to the sediment storage place on the water through the sediment transport pipe. Can be transported.

According to the fourth feature, since the dredging work vessel is provided with a sediment storage tank, the dredging work vessel itself can store the dredging sediment without having to put the soil carrier sideways on the dredging work vessel. , Dredging work can be continued even if there is no soil carrier, and even when the dredging work is interrupted due to a failure of the bucket device etc., the earth and sand accumulated in the dredging work ship can be transshipped to the soil carrier. , Work efficiency is improved as a whole.

FIG. 1 is an overall side view showing a dredging work vessel according to the first embodiment of the present invention. FIG. 2 is a plan view of a main part of the dredging work vessel (cross-sectional view taken along line 2-2 of FIG. 1), a partially enlarged plan view, and a partially enlarged perspective view. FIG. 3 is a front view of the grab bucket (enlarged view of the three arrow viewing portion of FIG. 1). FIG. 4 is a side view of the grab bucket (4 arrow view of FIG. 3). FIG. 5 is a vertical cross-sectional view (5-5 line cross-sectional view of FIG. 4) of the grab bucket viewed in the same direction as that of FIG. FIG. 6 is a plan view of the grab bucket (6 arrow view of FIG. 5). FIG. 7 is a cross-sectional view corresponding to FIG. 5 showing the relationship between the grab bucket at the position of the alternate long and short dash line in FIG. 1 and the bottom of the water. FIG. 8 is a process diagram showing an example of the closing process of the grab bucket. FIG. 9 is a cross-sectional view corresponding to FIG. 5 showing a modified example of the extension plate portion. FIG. 10 is a side view (corresponding to FIG. 4) of the grab bucket according to the second embodiment. FIG. 11 is a sectional view taken along line 11-11 of FIG. 10 (corresponding to FIG. 5). FIG. 12 is a plan view (corresponding to FIG. 6) of the grab bucket according to the second embodiment.

A ... Sediment flow assisting device B ... Boom Ba ... Tip C ... Control device D ... Hull propulsion device E ... Underwater G, G'... Grab bucket S as a bucket device S ... Dredging work vessel M2 ... Second winch device as a winch device W2 ... Second wire p1 as a wire ... 1 ... Hull 3 ... Sediment storage tank as a sediment storage place 4 ... Sediment 8 ... Sediment transport pipe

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, the dredging work vessel S has a hull 1 floating on the water surface, for example, a hull propulsion device D capable of propelling the hull 1 along the water surface, and can swing (tilt) vertically with respect to the hull 1. The boom B is pivotally supported, the first wire W1 whose one end is connected to the tip Ba of the boom B, and the other end side of the first wire W1 provided on the hull 1 can be wound and unwound. A first winch device M1 for tilting the boom, a grab bucket G as a bucket device suspended from the tip Ba of the boom B via a second wire W2, and a second wire W2 provided on the hull 1 are wound. It is provided with a second winch device M2 for raising and lowering a bucket that can be taken out and taken out, and a pair of left and right sediment storage tanks 3 installed on the hull 1 to form a sediment storage place on the water.

The first winch device M1 includes a drum capable of winding the first wire W1 and a motor for rotationally driving the drum. Then, by winding or unwinding the first wire W1 by the first winch device M1, the boom B connected to the wire W1 can be tilted upward or downward.

Further, the second winch device M2 includes a drum capable of winding the second wire W2 and a motor for rotationally driving the drum. Then, by winding or unwinding the second wire W2 by the second winch device M2, the grab bucket G suspended from the wire W2 can be raised or lowered. The first and second wires W1 and W2 are provided in pairs on the left and right, but may be one each or three or more each.

As will be described later, the grab bucket G is configured so that the earth and sand 4 on the bottom E can be squeezed and excavated, and the excavated earth and sand squeezed into the grab bucket G is a flexible earth and sand transport pipe. It is pumped to the earth and sand storage tank 3 on the water through 8. Therefore, in the dredging work, it is not necessary to pull up the grab bucket G to the water one by one, and the work efficiency can be improved. The grab bucket G is an example of the bucket device of the present invention. The specific structure of the grab bucket G will be described later.

In the boom B, the base end portion Bb of the boom B is pivotally supported by the carriage portion 5b of the movable support 5 mounted on the front portion of the hull 1 so as to be movable only back and forth, and the boom B is provided around the shaft support p1 portion. It can swing up and down not only on the water but also in the water. As is clear from the partially enlarged perspective view of FIG. 2, the bogie portion 5b has a notch-shaped boom relief portion 5bk for avoiding interference between the boom B and the movable support 5 regardless of the tilting posture of the boom B. have.

The movable support 5 is interlocked with a drive device provided between the bogie portion 5b and the hull 1 thereof, and can be driven back and forth on the hull 1 together with the base end portion Bb of the boom B. As the drive device, for example, as shown in FIG. 2, a motor (not shown) is a drive wheel 5w with a brake mechanism that is axially supported by the trolley portion 5b and can travel along a guide rail 9 fixed to the hull 1. It is possible to adopt a structure in which deceleration is driven by a motor, or a structure in which a pinion with a brake mechanism that meshes with a rack fixed to the hull 1 and is pivotally supported by the trolley portion 5b is decelerated and driven by a motor, although not shown.

Thus, with the movable support 5 fully advanced, the boom B is in a state of projecting to the frontmost side as shown in FIG. 1, and has an upward swing limit standing above the water surface and below the water surface. It is possible to swing up and down with the downward swing limit that sinks in. The front end of the hull 1 is provided with a relief portion 1a for allowing the boom B to swing to the downward swing limit in water, and the relief portion 1a is opened upward / downward and forward. It is formed in a notch shape.

In the state where the movable support 5 is finally retracted with the boom B in the horizontal posture, the boom B is in the most retracted retracted state as shown by the chain line in FIG. This stored state is selected when the dredging work vessel S is moved for a long distance, when the grab bucket G is inspected and maintained, and the like.

Further, at the front part of the hull 1, a support frame 6 formed in a gate shape so as to straddle the front-back movement locus of the movable support 5 is erected. A first guide roller r1 that guides and passes through an intermediate portion of the first wire W1 unwound from the first winch device M1 is rotatably supported on the upper portion of the support frame 6.

On the other hand, the intermediate portion of the second wire W2 unwound from the second winch device M2 is rotatably supported by the second guide roller r2 supported by the movable support 5 and the front and rear portions rotatably supported by the tip portion Ba of the boom B. It is guided by and passed through the pair of third guide rollers r3, and hangs down from the tip Ba of the boom B. The second guide roller r2 is pivotally supported by the upper end portion of the support base 5a erected on the carriage portion 5b of the movable support 5. Further, the pair of front and rear third guide rollers r3 allow the second wire W2 to pass between them.

Next, a structural example of the grab bucket G will be described mainly with reference to FIGS. 3 to 8. The grab bucket G is formed of a bottomed cylindrical main frame 11 and a cylindrical shape with open upper and lower ends, and is slidably fitted to the outer periphery of the main frame 11 via a plurality of annular seal members 18. The base is pivoted to the lower end of the elevating cylinder 12 via hinge brackets b2 and b3 so that the elevating cylinder 12 as an elevating body and the open lower end of the elevating cylinder 12 can be opened and closed to scrape the earth and sand 4 of the water bottom E inside. A pair of squeezing plates 13 connected to each other (shaft support) p2, a first hydraulic cylinder Cy1 as an opening / closing drive device for opening / closing both squeezing plates 13, and an elevating cylinder 12 are driven up / down with respect to the main frame 11. The second hydraulic cylinder Cy2 as an elevating drive device and the other end Po are connected to the upstream end of the earth and sand transport pipe 8 by opening Pi at one end in the bottom wall 11b of the main frame 11 and fixed in the main frame 11. A check valve 15 for preventing the backflow of the earth and sand 4 pushed out from the sand discharge pipe P to the earth and sand transport pipe 8 side is provided.

The annular seal member 18 is fitted into an annular groove provided on either one of the facing peripheral surfaces of the main frame 11 and the elevating cylinder 12, and is in sliding contact with the other of the opposing peripheral surfaces.

The upper end wall 11a of the main frame 11 is connected and supported at the free end, that is, the lower end of the second wire W2. Then, the second wire W2 can drive the main frame 11 (hence, the grab bucket G) in the horizontal direction and the vertical direction in water in conjunction with the movements of the hull 1, the second winch device M2, and the boom B.

The lower end wall of the main frame 11, that is, the bottom wall 11b is formed in the shape of a hemispherical plate that is curved downward, and a sand drain pipe is formed at the central portion of the bottom wall 11b, that is, the central top of the hemispherical surface that bulges downward. The large-diameter lower end (that is, one end of the sand drain pipe P) Pi of the truncated cone-shaped lower half pipe portion of P is opened and fixed. The upper half pipe portion of the sand removal pipe P is formed in a cylindrical shape, and the lower end of the upper half pipe portion is integrally connected to the small diameter upper end of the lower half pipe portion, and the upper end of the upper half pipe portion (that is, The other end of the sand removal pipe P) is connected to the upstream end of the earth and sand transport pipe 8 via a joint.

Further, the intermediate portion of the sand removal pipe P is fixed and supported on the inner peripheral wall of the main frame 11 via a plurality of support plates 16, and the upper portion penetrates and is fixed to the upper end wall 11a of the main frame.

The check valve 15 prevents the backflow of earth and sand downward, and in the illustrated example, only one check valve 15 is installed in the upper half pipe portion of the sand drain pipe P, but the number of check valves 15 installed and the installation The site and the valve body structure are not limited to the embodiments and can be appropriately set. For example, in addition to / or instead of the installation mode of the embodiment, the check valve 15 may be installed in the vicinity of the lower end Pi of the lower half pipe portion of the sand removal pipe P or in the intermediate portion.

Further, the check valve 15 of the present embodiment has a valve structure having a single leaf valve body of a single opening type, but in particular, a large diameter portion of the sand drain pipe P (for example, near or in the middle of the lower end Pi of the lower half pipe portion). When the check valve 15 is installed in the section), a valve structure having a pair of double-door (that is, double-door) leaf valve bodies may be used. Regardless of where the check valve 15 is installed, the inner surface of the sand drain pipe P is a valve for avoiding interference with the valve body of the check valve 15 and ensuring smooth opening and closing operation of the valve body. It is desirable to recess the body escape part (not shown). Further, on the inner peripheral surface of the sand removal pipe P, a stopper protrusion (not shown) capable of engaging with the valve body is provided so that the valve body of the check valve 15 does not open downward from the fully closed position and rotate. Provided.

Further, the pair of scraping plates 13 have a symmetrical shape with each other, and in a state where both are closed (see FIGS. 3 and 5), the pair of scraping plates 13 have a hemispherical plate shape that is close to and faces the lower surface of the hemispherical plate-shaped bottom wall 11b of the main frame 11. (That is, the hemispherical plate is further divided into two equal parts). Then, the excavated earth and sand 4 scraped by both scraping plates 13 is forcibly pushed into the sand removal pipe P by driving the elevating cylinder 12 upward with respect to the main frame 11 with the scraping plates 13 closed. ..

The edge portions that serve as the mating surfaces of the pair of scraping plates 13 are formed in a slightly tapered cross section in order to make it difficult for earth and sand to be pinched when both scraping plates 13 are closed. If necessary, a plurality of claws capable of efficiently crushing the bottom sediment may be alternately fixed to the edge portions (particularly the lower end edge portion) of both scraping plates 13.

At the lower end of the elevating cylinder 12, a base portion of a short cylindrical extension plate portion 12a extending downward from the lower end of the elevating cylinder 12 is continuously provided, and the tip, that is, the lower end of the extension plate portion 12a is scratched. When the insert plate 13 is closed, it comes into contact with the upper end edges of both suction plates 13. As a result, the gap between the lower end edge of the elevating cylinder 12 and the upper end edge of both the suction plates 13 in the fully closed state can be made substantially zero or small, which is compatible with the sealing effect of the annular sealing member 18 described above. In addition, the space 40 between the fully closed both scraping plates 13 and the bottom wall 11b of the main frame 11 can be made substantially sealed, and the excavated earth and sand and the earth and sand flow assisting device A described later can be applied through the gap. It is possible to effectively suppress the leakage of pressurized air and pressurized water to the outside.

In the illustrated example, the tip of the extension plate portion 12a is directly in contact with the upper end edge of both the suction plates 13 in the fully closed state, but the tip of the extension plate portion 12a and the both suction plates 13 in the fully closed state are brought into direct contact with each other. A sealing member (not shown) made of an elastic material (for example, a rubber material) may be attached to at least one of the upper end edges of the space 40, and in this case, the sealing effect of the space 40 can be further enhanced. It becomes. Further, in the illustrated example, the extension plate portion 12a is formed integrally with the main body portion of the elevating cylinder 12, but the extension plate portion 12a is formed separately from the main body portion of the elevating cylinder 12 and is retrofitted. It may be fixed (for example, welded) to the elevating cylinder 12.

Further, FIG. 9 shows a modified example of the extension plate portion. In this modification, a base portion of an arc plate-shaped extension plate portion 13a extending upward from the upper end of each scraping plate 13 is continuously provided at the upper end portion of each scraping plate 13, and the extension plate portion 13a is provided. The tip, that is, the upper end of the pipe is brought into contact with the lower edge of the elevating cylinder 12 when both the scraping plates 13 are closed. Then, according to the extension plate portion 13a of this modified example, as in the extension plate portion 12a of the embodiment, the gap between the lower end edge of the elevating cylinder 12 and the upper end edge of both the suction plates 13 in the fully closed state. Can be substantially zero to very small.

A seal member may be attached to the tip of the extension plate portion 13a and / or the lower end of the elevating cylinder 12, and in this case, the sealing effect of the space 40 can be further enhanced. Further, the extension plate portion 13a may be formed separately from the scraping plate 13 and fixed (for example, welded) to the scraping plate 13 by retrofitting.

A pair of first hydraulic cylinders Cy1 are installed for each of the individual scraping plates 13. For example, the base end of the first hydraulic cylinder Cy1 is pivotally connected to the upper part of the outer peripheral wall of the elevating cylinder 12 via a hinge bracket b1, and the tip is a refracting link mechanism 17 composed of a pair of links that can be refracted from each other. A pivotal connection p6 is made to the base of each scraping plate 13 via. That is, both ends of the refraction link mechanism 17 are pivotally connected to the elevating cylinder 12 and each scraping plate 13 via hinge brackets b2 and b3, respectively, and the intermediate portion (that is, the refraction point) of the refraction link mechanism 17 is connected. The tip of the first hydraulic cylinder Cy1 is pivotally connected to the pivotally connected portion).

Further, the second hydraulic cylinder Cy2 is installed in pairs on the left and right at positions that are out of phase with the first hydraulic cylinder Cy1. For example, the base end of the second hydraulic cylinder Cy2 is pivotally connected to the upper part of the outer peripheral wall of the main frame 11 via a hinge bracket b4, and the tip is connected to the lower part of the outer peripheral wall of the elevating cylinder 12 via a hinge bracket b5. The pivotal connection is p8.

The first and second hydraulic cylinders Cy1 and Cy2 are supplied and controlled with their respective operating hydraulic pressures from a hydraulic control circuit including a hydraulic source and a control valve installed on the hull 1 via a flexible hydraulic pipe that passes through water. To. The hydraulic control circuit and the hydraulic conduit are not shown.

By injecting pressurized air and pressurized water into the earth and sand 4 pushed into the sand removal pipe P, the earth and sand 4 in the sand removal pipe P is diffused into the grab bucket G, and the earth and sand transport pipe 8 is diffused from the sand removal pipe P. A sediment flow assisting device A is provided to assist the flow of the sediment 4 toward the sediment storage place 3 through the above.

The earth and sand flow assisting device A of the present embodiment includes a large number of air injection nozzles Na arranged and fixed inwardly at intervals in the circumferential direction and the vertical direction on the peripheral wall of the sand removal pipe P, and the same as the sand removal pipe P. A large number of water injection nozzles Nw arranged and fixed inwardly at intervals in the circumferential direction and the vertical direction on the peripheral wall, and air supply for supplying pressurized air and pressurized water to these air injection nozzles Na and water injection nozzles Nw, respectively. It is provided with a pipe Lai and a water supply pipe Lwi.

Each of the air injection nozzle Na and the water injection nozzle Nw is arranged in a direction in which the injection port is inclined slightly downstream (upper side in the drawing) toward the axis of the sand discharge pipe P, and is injected from there. Due to the flow pressure of the pressurized air and the pressurized water, the excavated earth and sand 4 pushed into the sand discharge pipe P can be efficiently diffused and efficiently pumped to the downstream side (that is, the earth and sand transport pipe 8 side).

Further, on the outer peripheral portion of the hemispherical plate-shaped bottom wall 11b of the main frame 11, a plurality of air injection nozzles Na'and water injection nozzles Nw' are directed outward (more specifically) at intervals in the circumferential direction and the vertical direction. Is arranged and fixed in a direction in which the sand drain pipe P is slightly inclined downward in the radial direction. These air injection nozzle Na'and water injection nozzle Nw'are also connected to the air supply pipe Lai and the water supply pipe Lwi, respectively.

Then, the pressurized air and the pressurized water injected from the air injection nozzle Na'and the water injection nozzle Nw' are injected into the narrow space 40 between the fully closed suction plate 13 and the bottom wall 11b of the main frame 11. By doing so, the excavated earth and sand 4 scraped into the scraping plate 13 is efficiently diffused in the scraping plate 13 from before being pushed into the sand removal pipe P to improve the fluidity. , It is possible to efficiently push it into the sand removal pipe P.

Thus, the air injection nozzle Na and the water injection nozzle Nw constitute the first injection means in the sediment flow assisting device A, and the air injection nozzle Na'and the water injection nozzle Nw' are in the sediment flow assisting device A. It constitutes a second injection means.

The air supply pipe Lai and the water supply pipe Lwi are supplied from the air supply control device including the pressurized air source and the air control valve installed on the hull 1, and the water supply control device including the pressurized water source and the water control valve, respectively. Pressurized air and pressurized water are supplied and controlled, respectively, via the flexible air conduit Lao and the water conduit Lwo.

Further, in the present embodiment, the first injection means (Na, Nb) of the earth and sand flow assisting device A injects both pressurized air and pressurized water to the earth and sand 4 pushed into the sand discharge pipe P. However, the first injection means (Na, Nb) of the earth and sand flow assisting device A injects either pressurized air or pressurized water (for example, only pressurized water) to the earth and sand 4 pushed into the sand discharge pipe P. It may be a structure to be used. Further, the second injection means (Na', Nb') of the earth and sand flow assisting device A is the same as the first injection means, that is, either one of the pressurized air or the pressurized water (for example, the space 40). A structure that injects only pressurized water) may be used.

Further, the downstream part of the earth and sand transport pipe 8 is wound up and unwound by a drum device 20 provided on the hull 1 near the earth and sand storage tank 3. This drum device 20 has a pair of left and right earth and sand outlet pipes 20a communicating with the downstream end of the earth and sand transport pipe 8, and the earth and sand conveyed through the earth and sand transport pipe 8 is a pair of left and right earth and sand outlet pipes 20a. It is put into the earth and sand storage tank 3 and stored.

Further, the intermediate portion of the earth and sand transport pipe 8 fed out from the drum device 20 passes through the through hole portion 5ah in the front-rear direction provided in the support base 5a of the movable support 5, and is placed on the plurality of fourth guide rollers r4 above the boom B. Extends to the front side in a substantially straight line. In this case, the arrangement of the plurality of fourth guide rollers r4 is such that the earth and sand transport pipe 8 is reasonably bent downward at the tip portion Ba of the boom B.

It should be noted that, on the bottom surface of the through hole portion 5ah of the support base 5a, a medium-high rounded surface that guides the earth and sand transport pipe 8 reasonably is formed. Further, a sheet material having a low friction coefficient for smoothly guiding the earth and sand transport pipe 8 may be adhered to the bottom surface of the through hole portion 5ah, or a guide roller (not shown) may be provided.

Further, the hydraulic conduit connected to the first and second hydraulic cylinders Cy1 and Cy2 and the air conduit Lao and the water conduit Lwo may be bundled and extended to the hull 1 side, or they may be extended to the hull 1 side. At least a part of the above may be extended to the hull 1 side alone.

By the way, at the rear part of the hull 1, a main propulsion device 21 for propelling the hull 1 in the front-rear direction is provided. The main propulsion device 21 includes, for example, a main screw 21a and a power unit 21u that rotationally drives the main screw 21a.

Further, on the bottom surface of the front part of the hull 1, a side thruster 22 for propelling the front part of the hull 1 in the left-right direction is provided. The side thruster 22 includes, for example, a thrust water injection unit 22a provided at the left and right central portions of the front bottom surface of the hull 1, and a high-pressure water supply device 22s for supplying high-pressure thrust water to the thrust water injection unit 22a. Then, the front portion of the hull 1 can be propelled in the left-right direction by the reaction of the high-pressure thrust water injected from the left and right thrust water injection portions 22a of the side thruster 22 to either the left or right side.

The side thruster 22 is not limited to a structure as in the embodiment in which thrust water is jetted laterally. For example, the side thrusters 22 are left and right lateral auxiliary screws provided on both left and right sides of the front part of the hull 1, and the front part of the hull 1. May be propelled in the left-right direction.

Further, at the rear part of the hull 1, a strut frame 24 fixed to the hull 1 and a strut frame 24 slidable up and down and supported in an upright posture, and the tapered lower end can be driven into the earth and sand 4 of the bottom E and fixed. The spud 25 is formed by pressing the long spud 25 of the book, the spud elevating drive device 26 capable of elevating and lowering the spud 25 while maintaining the upright posture, and the spud 25 fixed by driving it into the earth and sand 4 of the bottom E in the front-rear direction. On the other hand, a spud front-rear drive device 27 for accurately moving the hull 1 back and forth within a predetermined stroke range is provided.

The spud elevating drive device 26 is installed on, for example, a support column frame 24, and has a conventionally known structure capable of elevating and driving the spud 25 with respect to the hull 1. As the structure, for example, a structure in which a wire having one end connected to the spud 25 is lifted or suspended by a winch device fixed to the hull 1 or the support frame 24 can be adopted.

The intermediate portion of the spud 25 is slidably fitted in a guide hole 1g long in the front-rear direction provided in the hull 1, and the hull 1 is provided with an actuator 28 for pressing the spud 25 in the front-rear direction. .. The actuator 28 has an output arm portion 28a that engages with the spud 25 in a relative immovable manner in the front-rear direction, and the reaction of the output arm portion 28a pressing the spud 25 in the front-rear direction causes the actuator 28 to interact with the spud 25. The hull 1 can be driven back and forth. The actuator 28 and the guide hole 1g cooperate with each other to form the spud front / rear drive device 27.

Therefore, the spud 25, the spud elevating drive device 26, and the spud front / rear drive device 27 cooperate with each other to form a spud type hull propulsion mechanism SP that advances the hull 1 back and forth by a predetermined amount with high accuracy.

Further, the main propulsion device 21, the side thruster 22, and the spud type hull propulsion mechanism SP cooperate with each other to form the hull propulsion device D described above, and the hull propulsion device D is underwater. The hull 1 can be propelled back and forth and left and right along the water surface in order to adjust the horizontal position of the grab bucket G at.

By the way, the first winch device M1 raises and lowers the grab bucket G by tilting the boom B up and down via the first wire W1, and the second winch device M2 raises and lowers the grab bucket G via the second wire W2. Can be made to. Therefore, since any of the winch devices M1 and M2 can function as an underwater lifting drive means for the grab bucket G, these winch devices M1 and M2, and the boom B and the second wire W2 for suspending the grab bucket G The hull propulsion device D described above cooperates with each other to form a driving means K for moving the grab bucket G underwater.

Further, in the work command room 30 provided near the rear part of the hull 1, a steering system for steering the dredging work vessel S and each part of the dredging work vessel S (for example, a main propulsion device 21, a side thruster 22, a spud type hull propulsion mechanism) For various operation systems (not shown) other than the steering system for operating the SP, first and second winch devices M1, M2, first and second hydraulic cylinders Cy1, Cy2, etc., and each operation system. A control device C having a microcomputer as a main part is provided.

In the control device C, based on the GPS position information of at least one of the hull 1, the boom B, and the grab bucket G, the grab bucket G sets the excavation target section of the water bottom E along a predetermined excavation route as a predetermined subsection ( A control program that can control the position of the hull 1 by operating and controlling the hull propulsion device D so that it can move in units of (hereinafter, simply referred to as a predetermined section), and can execute the control based on the operation input to the operation system in advance. It has been incorporated.

For example, a GPS antenna is attached to the tip Ba of the boom B, and the position information of the tip Ba of the boom B (hence, the position information of the grab bucket G directly under the tip Ba) is detected based on the GPS signal received by this antenna. By controlling the operation of the hull propulsion device D, the dredging work by the grab bucket G can be accurately and sequentially executed for each predetermined section in which the excavation target section is divided into a plurality of sections.

Further, for example, when a GPS antenna is attached to an appropriate position on the hull 1 and the position information of the hull 1 is detected based on the GPS signal received by this antenna, the position information of the hull 1 and the GPS antenna of the hull 1 are detected. The position of the boom tip Ba (hence, the position information of the grab bucket G directly under the tip Ba) is estimated from the misalignment information between the mounting part and the boom tip Ba, and the hull propulsion device D is operated based on the estimated value. By controlling, the dredging work by the grab bucket G can be accurately and sequentially executed for each predetermined section in which the excavation target section is divided into a plurality of sections.

In this case, the misalignment information includes the length of the boom B and the tilt angle (this tilt angle can be directly measured by the angle sensor or can be estimated from the wire W1 winding amount of the first winch device M1). By taking this into consideration, it is possible to estimate more accurately.

Further, the hull 1 is provided with a depth sensor (for example, an ultrasonic sensor) 31 (not shown) capable of measuring the depth of the bottom E and the depth of the grab bucket G in a non-contact manner, and the detection information of the depth sensor 31 is also controlled by the control device C. It is output to and used to control the grab bucket G.

Next, the operation of the first embodiment will be described.

In the dredging work, first, the dredging work vessel S is operated and driven by itself to the dredging water area, but at this time, the boom B is held in the standby position on the water (for example, the X position or the Y position in FIG. 1). deep.

Then, when the dredging work vessel S arrives at the dredging water area, the spud 25 is lowered and driven into the bottom E to be fixed. At this time, the hull 1 is held in advance with respect to the spud 25 within the guide hole 1g within a predetermined retreat limit by the spud front / rear driving device 27. Further, by adjusting the water flow in each of the left and right directions injected from the thrust water injection portion 22a of the side thruster 22, the turning of the hull 1 around the spud 25 is suppressed.

Next, by feeding out the first wire W1 from the first winch device M1, the boom B is swung downward and placed in a tilted posture below the water surface (for example, the Z position in FIG. 1). Then, by feeding out the second wire W2 from the second winch device M2, the second wire W2 is hung down from the tip Ba of the boom B existing in the water, and the grab bucket G is subsided to the bottom E, which will be described below. The excavation work of the bottom sediment by the grab bucket G, that is, the dredging work is started.

First, the grab bucket G causes the pair of suction plates 13 to be fully opened by contracting the first hydraulic cylinder Cy1 before it reaches the bottom E, and the elevating cylinder 12 is extended by extending the second hydraulic cylinder Cy2. The main frame 11 is lowered to the lowering limit. Then, when both the scraping plates 13 bite into the earth and sand of the water bottom E as shown in FIG. 7, the both scraping plates 13 are closed in the first hydraulic cylinder Cy1 as shown in FIGS. 8A to 8B. By forcibly rotating the cylinder, the bottom sediment is scraped into both scraping plates 13 and excavated.

With the start of this dredging work, pressurized air and pressurized water are injected from the air injection nozzles Na and Na'and the water injection nozzles Nw and Nw' of the sediment flow assisting device A, respectively. The pressurized air and pressurized water flow only from the sand discharge pipe P to the earth and sand transport pipe 8 side, especially when both suction plates 13 are closed, and the inside of the earth and sand transport pipe 8 is on the upper side (that is, the earth and sand storage tank). It is used to transport excavated earth and sand toward (3 side).

Then, when both the scraping plates 13 are closed to the fully closed position as shown in FIG. 8 (b), the elevating cylinder 12 is raised by the second hydraulic cylinder Cy2 to the ascending limit as shown in FIG. 8 (c). As the rise, the both scraping plates 13 approach the bottom wall 11b of the main frame 11 and open the excavated earth and sand 4 in both scraping plates 13 (that is, in the space 40) into the sand drain pipe P. Push it in mechanically and forcibly from the lower end Pi. In the state where both suction plates 13 are closed, the earth and sand scraped into both suction plates 13 is particularly the injection pressure of pressurized air and pressurized water from the air injection nozzle Na'and the water injection nozzle Nw'. In order to increase the fluidity by being sufficiently agitated by the above, the lifting cylinder 12 is pushed into the sand removal pipe P efficiently and smoothly by the pushing action of both scraping plates 13.

Further, the earth and sand immediately after being pushed into the sand discharge pipe P is assisted by the injection pressure of the pressurized air and the pressurized water from the air injection nozzle Na and the water injection nozzle Nw, and check back to the upstream side, that is, the earth and sand transport pipe 8 side. It is smoothly pumped and flowed through the valve 15.

Since one excavation cycle by the grab bucket G is completed in this way, the spud 25 is then pushed backward by the spud front / rear drive device 27 to advance the hull 1 by a predetermined amount. Then, both the scraping plates 13 are opened and swung to the fully open position again, and then lowered again to bite into the earth and sand of the bottom E as shown in FIG. 7. After that, both the scraping plates 13 are swung again in the closing direction to execute the above-mentioned excavation cycle. During this time, the excavated earth and sand 4 pushed into the sand discharge pipe P is pumped and stored in the earth and sand storage tank 3 of the hull 1 via the earth and sand transport pipe 8 by utilizing the injection pressure of the pressurized air and the pressurized water described above. To. Then, by repeating such an excavation cycle several times, the dredging work for one predetermined section of the bottom E is completed.

Next, the hull 1 is swiveled around the spud 25 by a predetermined small angle by adjusting the water flow in the left-right direction jetted from the thrust water injection portion 22a of the side thruster 22, and then the hull 1 is stopped at the swivel position. Then, the spud 25 is pressed in the front-rear direction by the spud front-rear drive device 27 to move the hull 1 forward or backward by a predetermined amount, and during that time, the same excavation cycle as described above is repeated, so that the next next section adjacent to the predetermined section is adjacent to the previous section. The dredging work for the predetermined section is executed.

Then, by repeating such dredging work one after another for each adjacent predetermined section, the fan-shaped or annular excavation target section over a desired turning angle range (maximum 360 degrees) centered on the spud 25 is dredged. Can be done.

When the dredging work of one excavation target section is completed in this way, the hull 1 is moved to the next excavation target section. At the time of this movement, the spud 25 is once pulled up from the bottom E, and then the hull 1 is moved forward or backward by a predetermined distance by the main propulsion device 21, and then the spud 25 is driven into the bottom E again and fixed.

Then, in the same procedure as the dredging work for the immediately preceding excavation target section, the dredging work is sequentially executed for each predetermined section in the next excavation target section. In this case, since the history of the position information of the tip portion Ba of the boom B (therefore, the grab bucket G immediately below the tip portion Ba) is completely stored in the storage unit of the control device C, the previous (thus) from the position information history That is, it is possible to omit the dredging work and move to the next predetermined section for the predetermined section that is presumed to overlap with the predetermined section (which has already been dredged).

Through the above process, the grab bucket G can dredge the bottom E to be excavated over a wide area.

In the dredging work vessel S of the present embodiment described above, the boom B pivotally supported by the hull 1 is configured to be able to tilt not only on the water but also in the water in the vertical direction. Then, the second wire W2 unwound from the second winch device M2 on the hull 1 can hang from the tip portion Ba of the boom B in the water during the dredging work process to suspend the grab bucket G.

As a result, the grab bucket G can efficiently excavate the bottom sediment by utilizing its large weight, and while taking advantage of the grab bucket G by suspending the wire, the second wire W2 from the boom tip Ba. Since it is possible to shorten the hanging length of the wire as much as possible, the second wire W2 eliminates or makes it difficult to receive the influence of wind and waves on the water surface and the influence of tidal current in water (especially in water near the water surface). be able to. As a result, the deviation of the horizontal position of the grab bucket G with respect to the position of the hull 1 (hence, the horizontal position of the boom tip Ba) can be effectively reduced, so that the grab bucket G can be associated with the position control of the hull 1. The accuracy of the position control of is improved.

In particular, the dredging work vessel S of the present embodiment controls the operation of the hull propulsion device D capable of propelling the hull 1 along the water surface and the operation of the hull propulsion device D in order to adjust the horizontal position of the grab bucket G in water. The control device C controls the position of the hull 1 by operating the hull propulsion device D based on the GPS position information of at least one of the hull 1, the boom B and the grab bucket G. By doing so, the grab bucket G can move the excavation target section of the water bottom E by a predetermined section along a predetermined excavation route.

As a result, the grab bucket G moves the excavation target section of the water bottom E by a predetermined section along a predetermined excavation route by using the position information of the hull 1, that is, the GPS position information as a clue, without fixing the hull 1 to the bottom E. Since it is possible, the dredging work by the grab bucket G can be performed evenly over a wide area of the water bottom E. Moreover, the position control of the grab bucket G during the dredging work is combined with the effect of making the second wire W2 hang down from the boom tip Ba in the water to eliminate or make it difficult to receive the influence of waves and tidal currents. Therefore, it is possible to execute it with high accuracy.

Further, since the hull 1 of the dredging work vessel S of the present embodiment is provided with the earth and sand storage tank 3, the dredging work vessel S itself can store the dredging earth and sand 4 without having to put the earth carrier sideways on the dredging work vessel S to stand by. Will be. As a result, for example, the dredging work can be continued even when the soil carrier is not on standby, and even when the grab bucket G or the like breaks down and the dredging work is interrupted, the dredging work up to that point is performed in the earth and sand storage tank 3. The earth and sand stored in the dredging can be transshipped to the earth carrier, improving work efficiency as a whole.

Further, in the grab bucket G of the present embodiment, a pair of scraping plates 13 are pivotally supported p2 at the lower end of the lifting cylinder 12 which can be driven up and down with respect to the main frame 11 so as to be openable and oscillating. The excavated earth and sand 4 scraped into the sand 13 is forcibly pushed into the sand removal pipe P by driving the elevating cylinder 12 upward with respect to the main frame 11 with both scraping plates 13 closed. As a result, the scraping plate 13 is responsible for the function of scraping (that is, excavation) the bottom sediment, and the lifting cylinder 12 is mainly responsible for the function of pushing the scraped sediment into the sand discharge pipe P. The 13 and the elevating cylinder 12 can be optimally designed according to their respective functions, and the degree of freedom in design is increased as a whole. Further, since the amount of the above-mentioned scraped earth and sand pushed into the sand discharge pipe P is determined by the raising and lowering stroke of the elevating cylinder 12, a sufficient pushing amount is required without making the scraping plate 13 particularly large or increasing the stroke in the opening / closing direction. Can be secured.

Moreover, the bottom wall 11b of the main frame 11 is formed in a downwardly convex hemispherical shape, and one end Pi of the sand removal pipe P is opened at the central top of the bottom wall 11b. Further, the pair of scraping plates 13 are formed in a hemispherical shape corresponding to the hemispherical shape of the bottom wall 11b in the closed state, and when the elevating cylinder 12 reaches the ascending limit, both scraping plates 13 The space 40 between the inner surface and the lower surface of the bottom wall 11b is sufficiently filled, that is, both scraping plates 13 are close to and face the lower surface of the bottom wall 11b. As a result, the excavated earth and sand that have been scraped into the pair of scraping plates 13 can be efficiently pushed into the sand removal pipe P without bias, and the pushing efficiency can be improved.

Further, according to the grab bucket G of the present embodiment, the air injection nozzles Na, Na'and the water injection nozzles Nw, Nw'of the earth and sand flow assisting device A are used for the excavated earth and sand immediately before and after being pushed into the sand removal pipe P. By injecting pressurized air and pressurized water, respectively, the earth and sand can be sufficiently diffused to increase the fluidity, and the earth and sand flow from the sand discharge pipe P to the earth and sand storage tank 3 via the earth and sand transport pipe 8. Can be fully assisted. Moreover, the injection pressure of the pressurized air and the pressurized water for the sediment diffusion (improvement of fluidity) can be effectively utilized as the transport pressure of the sediment in the sediment transport pipe 8. As a result, the efficiency of sediment pumping through the sand removal pipe P and the sediment transport pipe 8 can be effectively increased.

Further, FIGS. 10 to 12 show a second embodiment of the present invention, which differs from the first embodiment only in the structure of the grab bucket. That is, in the first embodiment, the main frame 11 of the grab bucket G is cylindrical, the bottom wall 11b thereof is hemispherical, the elevating cylinder 12 is also cylindrical, and the pair of scraping

plates

13 and 13 are formed. In the second embodiment, the main frame 11'of the grab bucket G'is rectangular in cross section (more concretely), whereas the hemispherical plate is formed in the closed state (that is, the hemisphere plate is bisected). The bottom wall 11b'is semi-cylindrical, and the elevating cylinder 12'is also rectangular (more specifically, square) in cross-section, and a pair of scrapes. The plates 13'and 13'are formed to be semi-cylindrical in the closed state (that is, the semi-cylindrical plate is bisected by the cut surface in the bus direction).

Since the other structures of the second embodiment are the same as those of the first embodiment, each component of the second embodiment is limited to the reference code of the corresponding component of the first embodiment, and more. The description of is omitted.

And, also in the second embodiment, the same action and effect as in the first embodiment can be achieved.

Although the first and second embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various design changes can be made without departing from the gist thereof.

For example, in the above embodiment, the hull propulsion device D includes a spud type hull propulsion mechanism SP in addition to the main propulsion device 21 and the side thrusters 22, and the spud type hull propulsion mechanism SP moves the hull 1 back and forth by a predetermined amount. While advancing, the hull 1 is swiveled and rotated by a predetermined angle around the spud 25 by the side thruster 22, and the bucket device V moves and drenchs the fan-shaped or annular excavation target section of the water bottom E by a predetermined section. Shown what was possible. However, in the present invention, the main propulsion device 21 and the side thruster 22 are operated based on the GPS position information of at least one of the hull 1, the boom B and the grab bucket G without using such a spud type hull propulsion mechanism SP. By controlling the hull 1 to move forward or backward by a predetermined amount, or laterally move in either one of the left and right directions, the excavation target section of the bottom E is moved and dredged by a predetermined section along a predetermined excavation route. May be good. In that case, the side thrusters 22 are not only arranged at the front of the bottom of the hull 1 as in the above embodiment, but are also arranged at the rear of the bottom of the hull 1.

Further, in the above embodiment, the hull propulsion device D controls the position of the hull 1 in the dredging operation by controlling the operation based on the GPS position information of at least one of the hull 1, the boom B and the grab bucket G. As shown, instead of or in addition to the GPS position information, the hull propulsion device D is operated and controlled based on the position information from another position sensor capable of detecting the hull position to control the position of the hull 1. It may be.

Further, in the above embodiment, the sediment storage of the hull 1 via the sediment transport pipe 8 is utilized by utilizing the injection pressure of the pressurized air and the pressurized water from the sediment flow assisting device A provided in the grab bucket G (for example, the sand drain pipe P). Although the excavated earth and sand are pumped into the tank 3, in addition to the earth and sand flow assisting device A, for example, a jet pump means (JP) as shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2008-115610. May be provided in the middle of the sediment transport pipe 8 to assist the sediment flow in the sediment transport pipe 8. In this case, in addition to the injection pressure of the pressurized air and the pressurized water injected from the earth and sand flow assisting device A into the sand discharge pipe P, the injection pressure of the pressurized air and the pressurized water from the jet pump means (JP) also transports the earth and sand. Since it is used for the sediment transport pressure in the pipe 8, the excavated sediment can be pumped more efficiently into the sediment storage tank 3 of the hull 1.

Further, in the above embodiment, when the dredging work vessel S is operated far from the dredging water area, the dredging work vessel S is operated so as to run by itself to the dredging water area. In such a case, the dredging work vessel S is towed to another ship. It may be moved to the dredged water area.

Further, in the above embodiment, the sediment storage tank 3 provided in the hull 1 of the dredging work vessel S is illustrated as a sediment storage place on the water, but it is installed in a ship (for example, a soil carrier) or a water facility different from the dredging vessel S. The sediment storage tank may be used as a sediment storage place.

Further, in the first embodiment, the bottom wall 11b of the main frame 11 is formed in a hemispherical plate shape, and in the second embodiment, the bottom wall 11b'of the main frame 11'is formed in a hemispherical plate shape. In the present invention, the shape of the bottom wall of the main frame is not limited to the embodiment, and can be formed into a pair of closed scraping plates according to the shape, for example, even if it is a horizontal flat plate. Good.

Claims

A wire (W2) that can be wound and unwound by a winch device (M2) provided on the hull (1) from the tip (Ba) of the boom (B) that is pivotally supported (p1) on the hull (1). The bucket device (G, G') is suspended from the wire (W2), and the bucket device (G, G') is used to scrape and excavate the earth and sand on the bottom (E) and excavate the earth and sand transport pipe. In a dredging work boat that can be pumped to the sediment storage area (3) on the water through (8)
The boom (B) is configured to be tiltable in the vertical direction in water, and the wire (W2) can be dredged from the tip end portion (Ba) of the boom (B) in water. Work boat.
The hull propulsion device (D) capable of propelling the hull (1) along the water surface in order to adjust the horizontal position of the bucket device (G, G') in water, the hull (1), and the boom ( Based on the GPS position information of at least one of B) and the bucket device (G, G'), the bucket device (G, G') follows a predetermined excavation route in the excavation target section of the bottom (E). The dredging work vessel according to claim 1, further comprising a control device (C) capable of controlling the operation of the hull propulsion device (D) so as to be able to move the hull (1). ..
The bucket device (G, G') sprays pressurized air and / or pressurized water onto the excavated earth and sand (4) that has been scraped into the bucket device (G, G'), thereby causing the bucket device (G, G'). Claim 1 or claim 1, further comprising a sediment flow assisting device (A) that assists the flow of sediment (4) from G') to the sediment storage location (3) via the sediment transport pipe (8). The dredging work vessel described in 2.
The dredging work vessel according to any one of claims 1 to 3, wherein the hull (1) is provided with a sediment storage tank (3) serving as the sediment storage place.