JP3504196B2 - Dredging device and dredging method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging device for swinging a suction pipe to perform dredging, and more particularly to a dredging device and its dredging method capable of detecting an abnormal load applied to a suction port.

[0002]

DISCUSSION OF THE INVENTION In rivers and lakes, dredging is performed for the purpose of securing flow rate and water storage during floods, and for purification purposes. For this purpose, pump dredgers with cutters are used. However, if an attempt is made to dredge the vicinity of an existing structure with such a pump dredger with a cutter, the cutter may damage an existing revetment or an existing root consolidation work. For example, in the existing revetment using a sheet pile, if the sheet pile corrodes, it tends to be damaged by a small impact,
In addition, in the case of root consolidation, since the root consolidator may have moved from the original installation position due to subsidence due to scouring, it is not possible to know the exact location of the root consolidator. difficult. For this reason, generally, the vicinity of the existing structure is a portion left uncut without dredging, and when dredging must be performed near such an existing structure, a grab dredger has been used.

By the way, the same applicant as the above-mentioned applicant has a utility model of Sho 63-8.
According to Japanese Patent Publication No. 44-44, in a dredging device in which a base end portion of a suction pipe is provided at an appropriate position in a main body of a dredging ship or the like, a suction port is provided at a distal end of the suction pipe through a flexible tube, and one end is used as a suction port. We have proposed a dredging safety device (the scope of utility model registration claim) in which a wire rod is provided with a constant tension on the end of the main body, and a tension change detection device is provided in an appropriate position of the wire rod. In this dredging safety device, When the suction port comes into contact with an obstacle during a swing and a load of a certain amount or more is applied to the suction port, a tension of a certain amount or more is applied to the wire rod, and the limit switch operates to detect the obstacle.

Therefore, in the case of using a safety device that simply stops when an obstacle comes into contact with it, if the safety device is constantly operated, the safety device will not work even if the safety device is not needed due to a shrub, boulders or dust. The swing stops and the device stops unnecessarily, which reduces work efficiency,
It is expected that the safety device cannot be operated according to the conditions of the dredging site. Also, with such a safety device,
When a rubber sleeve is used, when the suction port comes into contact with an obstacle during the swivel, the rubber sleeve is deformed into a curved shape, so that the repulsive force increases.

Therefore, an object of the present invention is to provide a dredging device and a dredging method thereof, which can set a safety device according to a dredging place and can improve work efficiency.

[0006]

According to a first aspect of the present invention, a base end portion of a suction pipe that swings at an appropriate position of a dredging boat is provided, and a suction port is provided at a tip end of the suction pipe through a flexible pipe, and one end of the suction pipe is suctioned. On the mouth side, with the other end on the dredger side, install the wire rod with constant tension,
And, in the dredging device provided with a tension detecting device at an appropriate position of the wire rod, the tension detecting device detects the tension of the wire rod, and when the detected tension becomes a set value or more, a safety device that stops the swing of the suction pipe. The flexible tube is a rubber sleeve, and the set value can be changed.
The bending stress remains almost constant when the knuckle is bent over a specified angle.
It will be.

According to the structure of claim 1, the set value can be changed according to the type of the existing structure at the dredging place so that the suction port does not come into contact with the existing structure and an unreasonable load is applied to the existing structure.
Further, in a place where there is no existing structure, the set value can be increased to eliminate unnecessary interruption during work. By changing the setting value according to the dredging conditions,
The dredging work can be performed efficiently. Further, when the suction port comes into contact with the existing structure or the like and the rubber sleeve bends at a predetermined angle or more, the load is not applied to the existing structure any more. Thereby, for example, even when the suction pipe is undulated and comes into contact with the root-bottoming work of the water bottom, the load applied to the root-covering work can be suppressed to a substantially constant value or less.

Further, the invention of claim 2 is in a proper position of the dredger.
The suction pipe that swings is provided with a proximal end, and the suction pipe is flexible at the tip.
A suction port is provided through the pipe, and one end is connected to the suction port side.
A wire rod is provided with a constant tension with its end on the dredger side, and
In a dredging device with a tension detecting device in place,
The tension detection device detects the tension of the wire and the detected tension
Is above the set value, stop the swing of the suction pipe
Equipped with a safety device that allows the set value to be changed,
The bending angle of the flexible tube is detected .

According to the structure of the second aspect, the load applied to the contacted object can be calculated according to the bending angle.

According to the invention of claim 3, a hose body of the rubber sleeve is provided with a shape-retaining ring.

According to the third aspect of the present invention, by providing the shape-retaining ring on the center side, a predetermined bending stress can be obtained in the rubber sleeve by bending, and a kink is formed between the shape-retaining ring and the end. It can be set so that the bending stress does not increase when it occurs and becomes a certain value or more.

A fourth aspect of the present invention is a dredging method using the dredging device according to the first or second aspect , wherein the set value is changed in the vicinity of the existing structure and the other to perform the dredging.

According to the structure of the fourth aspect, the dredging work can be efficiently performed by changing the set value according to the condition of the dredging place.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 8 show a first embodiment of the present invention.
An embodiment is shown, and as shown in the figure, a base end portion of a rudder 2 is provided in a front portion of a dredger 1 so as to be capable of undulating by a pivot portion 2A, and a suction pipe 3 is provided in the rudder 2. Further, guides 4 and 4 are provided on the left and right sides of the front side of the ladder 2, one side of the pair of left and right swing wires 5 and 5 is connected to the swing winches 6 and 6 equipped on the dredger 1, and the other end is connected to the guide 4 , 4 are connected to the anchors 7, 7. Therefore, by winding the swing wire 5 by one winch 6 and sending the swing wire 5 by the other winch 6, the rudder 2 swings to one side around the spats (not shown) at the rear of the dredger 1, and conversely. If you do, swing to the other side. A rubber sleeve 8 which is a flexible tube is connected to the tip side of the suction tube 3, and a suction tube 9 is connected to the tip of the rubber sleeve 8, and a downward suction port 10 is provided at the tip of the suction tube 9. A net body 11 is stretched over the suction port 10. A plurality of jet nozzles 12 are provided around the suction pipe 9, and a flexible high-pressure water supply pipe 13 is connected to the jet nozzles 12. The high-pressure water supply pipe 13 is connected to the dredger 1
High-pressure water is supplied from a pump (not shown) that is a pressure-feeding means of the water, and the high-pressure water is ejected from the jet nozzle 12 to crush the mud and the like at the bottom of the water and facilitate the suction of the mud. . Further, on the tip side of the ladder 2,
The up-and-down wire 15 is connected through the connecting rod 14, and the up-and-down winch 16 provided on the dredging boat 1 winds up and down the up-and-down wire 15 to thereby up-and-down the suction pipe 3.

Left and right overhanging members on the tip side of the ladder 2.
17 and 17 are provided, and guides are provided at the tips of these overhanging members 17 and 17.
18 and 18 are provided, and one side 19A of the wire rope 19, which is a wire, is connected to one side of the suction cylinder 9 in the swing direction, and halfway is hung on the guide 18 and the other side 19B is tensioned to one side. Connect to the detector 21L. On the other side in the swing direction of the suction cylinder 9, one side 20 of the other side wire rope 20 that is a wire rod
While connecting A, the guide 18 is hooked partway, and the other side 20B is connected to the other side tension detecting device 21R. Note that the one-side and the other-side hearing detection devices 21L and 21R have the same configuration.

As shown in FIG. 4, the tension detecting device 21
L and 21R are provided with a hydraulic circuit 22, and this hydraulic circuit 22 includes
A cylinder 23 and a piston rod 24 are provided, and the piston rod 24 has the other ends 19B of the wire ropes 19 and 20,
20B is connected. Further, the hydraulic circuit 22 includes a hydraulic pressure source 25, a check valve 26 that feeds oil sent from one side of the hydraulic pressure source 25 only to the cylinder 23 side, and a check valve 26 and the cylinder 23. Is provided with a control box 27, the control box 27 is provided with a relief valve 41, a return channel 28 is connected to the return side of the relief valve 41, and the other side of the return channel 28 is the above-mentioned. It is connected to the other side of the hydraulic power source 25. The control box 27 is capable of continuously setting the relief pressure of the relief valve 41 by the electromagnetic control means 42, and the electromagnetic control means by the set value input by the set value input means 43 such as a keyboard.
42 operates to set a relief pressure, and further includes a pressure sensor 44 for detecting the pressure in the cylinder 23, and stops the winch 6 for swing based on the pressure output by the pressure sensor 44, An alarm device 45 can issue an alarm. In this case, the amount of movement of the piston rod 24 and the amount of deformation of the rubber sleeve 8 can be known by the increase in the pressure of the cylinder 23, and therefore the amount of movement or the amount of deformation can also be used for control. Further, a limit switch 29 operated by the piston rod 24 is provided on the pulling direction side of the piston rod 24, the piston rod 24 moves to the position of the limit switch 29, and the relief valve 41 is set to a value equal to or more than a set value. When pressure is applied, the contact object T is subjected to a load equal to or more than a predetermined load value. Therefore, the winch 6 is stopped and an alarm is issued. Then, the tension detecting devices 21L and 21R and the limit switch
The safety device 46 is composed of 29. The tension detecting devices 21L and 21R can be provided on the base end side of the ladder 2.

The details of the rubber sleeve 8 will be described below. As shown in FIG.
A short pipe 32 with a flange 31 is provided on both sides, and a bulging portion 33 is provided around the inner end side surface of the short pipe 32. The flange 31, the short pipe 32, and the bulging portion 33 are made of a hard material such as steel. Inner ends of the short pipes 32, 32 made of a material are connected by a hose body 34 having elasticity, and a shape-retaining ring 35 is embedded in the hose body 34 at the center side in the longitudinal direction. The shape-retaining ring 35 is made of steel or the like that is harder than the hose body 34. Also, the shape retaining ring 35
And the dimension S of the inner end of the short pipe 32 and the inner diameter dimension N of the hose body 34 are substantially the same. Incidentally, for example, the dimension S is 375 mm and the inner diameter dimension N is 358 mm.

A predetermined bending stress is obtained and the hose body 34
In order to prevent the occurrence of kinks and to make the bending stresses almost the same after kinking, a plurality of prototypes having the same configuration as the rubber sleeve 8 of FIG. It was created and a bending experiment was conducted. For example, when two shape-retaining rings 35 are embedded at intervals of 300 mm, a kink occurs, but since the shape-retaining ring 35 and the short tube 32 are short in size, the bending force after the kink due to the restraining force of these causes The bending stress increased with increasing. Therefore, as shown in FIG. 6, an experiment was carried out with one shape retaining ring 35 provided in the central portion. This experiment
As shown in FIG. 7, the flange 31 located on the lower side is fixed, the plate material 36 is fixed to the upper flange 31, the wire 37 is locked to the hook 37 provided on the plate material 36, and the rubber sleeve 8
The wire 37 was pulled so as to be substantially orthogonal to the inclination angle θ of, and the horizontal displacement amount δ at that time and the load required for the pulling were graphed, and the result as shown in FIG. 8 was obtained.

In this experiment, before the δ reaches about 500 mm, a kink K is generated between the lower short tube 32 and the shape-retaining ring 35, and the horizontal displacement δ is between 0 and 460 mm. The horizontal displacement amount δ and the load P are almost proportional, and when δ is 460 or more,
It was confirmed that the load P was almost constant. Then, based on the data of FIG. 8 and the like, the load applied to the contact object T when the suction cylinder 9 contacts the contact object T and the rubber sleeve 8 is displaced becomes the existing value. The load applied to the object T can be calculated, and the rubber sleeve 8
It is also possible to calculate the load applied to the contact object T from the horizontal deformation amount δ or the inclination angle θ obtained from the horizontal deformation amount δ and control so that the safety device 46 is activated before this load exceeds a predetermined load value.

Next, the dredging method by the dredger 1 will be described. While jetting high-pressure jet water from the jet nozzle 12, the mud on the bottom of the water is sucked from the suction port 10 and the swing winches 6 and 6 are operated. Swing in one direction and the other direction to perform dredging. Here, when the existing structure, for example, the contact object T is an existing revetment, when performing dredging in the vicinity of the existing revetment, before the suction cylinder 9 applies a load of a predetermined load value or more to the existing revetment, the swing winch is used. The relief pressure of the relief valve 41 is set so that 6 stops, and the safety device 46 is activated when the tension of the wire ropes 19 and 20 exceeds a set value. In this case, depending on the type of existing revetment, the setting corresponding to the predetermined load value is performed.
Therefore, even if the suction cylinder 9 hits the existing structure during dredging, the limit switch 29 is actuated, the swing winches 6 and 6 are stopped, and the rudder 2 is stopped before the existing structure is affected. It does not adversely affect existing structures. On the other hand, when performing the dredging at a position away from the existing structure, set the relief pressure higher than that of the dredging near the existing structure, and set the upper limit setting value for the tension of the wire ropes 19 and 20 to a higher level. By doing so, even if the suction cylinder 9 comes into contact with a tree, rocks, dust, or the like, the swing does not stop unnecessarily and the dredging can be performed efficiently.
Moreover, as shown in FIG. 3, even if the suction cylinder 9 comes into contact with the contact object T by undulating the ladder 2, there is an existing structure such as a rooting work as the contact object T on the bottom of the water.
When the rubber sleeve 8 bends to a predetermined angle and kinks K, the load is not applied to the contact object T any more, and it is possible to cope with dredging of the upper part of the rooting work, which was difficult in the past.

As described above, in this embodiment, in accordance with the first aspect, the base end portion of the suction pipe 3 which swings in a proper place of the body of the dredging boat 1 or the like is provided, and the rubber sleeve 8 as a flexible pipe is provided at the tip of the suction pipe 3. A wire rope 19, which is a wire rod, with the suction port 10 provided through the one end and the other end being the suction port 10 side and the other end being the dredger 1 side.
In a dredging device in which 20 is provided with a constant tension and tension detecting devices 21L and 21R are provided at appropriate positions of the wire ropes 19 and 20, the tension detecting devices 21L and 21R include a safety device 46 that stops the swing of the suction pipe 3. Since the set value can be changed, the set value can be changed depending on the type of the existing structure at the dredging place, and the swing can be stopped before the suction port 10 comes into contact and an unreasonable load is applied to the existing structure, It is possible to prevent damage to existing structures. Also, in places where there are no existing structures, the set value can be increased to eliminate unnecessary interruption during work,
By changing the set value according to the condition of the dredging place in this way, the dredging work can be efficiently performed.

Further, in this manner in the present embodiment, according to claim 1
Corresponding to, the flexible tube is a rubber sleeve 8, and when the rubber sleeve 8 is bent at a predetermined angle or more, the bending stress becomes substantially constant, so that the suction port 10 comes into contact with an existing structure or the like and the rubber sleeve 8 When 8 is bent at a predetermined angle or more, the load is not applied to the existing structure beyond this, and, for example, the suction pipe 3
Even when the undulations are undulated and come into contact with the root-bottoming work of the water bottom, the load applied to the root-covering work can be suppressed to a substantially constant value or less.

As described above, in this embodiment, the second aspect
Corresponding to, suction that swings to the proper place of the main body of the dredger 1 etc.
A rubber tube that is a flexible tube is provided at the tip of the suction tube 3 by providing the base end of the tube 3.
Suction port 10 is provided through the leave 8 and one end is suctioned
Wire rod that is the wire rod with the other end on the mouth 10 side and the dredger 1 side.
Provided flops 19, 20 at a constant tension, and the wire rope 19,
For a dredging device with tension detection devices 21 L and 21 R installed in 20 appropriate places
In addition, the tension detecting devices 21 L and 21 R swing the suction pipe 3
Equipped with a safety device 46 to stop the setting value can be changed,
Since the inclination angle θ that is the bending angle of the rubber sleeve 8 that is the flexible tube is detected, the load applied to the contacted object can be calculated according to the bending angle of the rubber sleeve 8.

As described above, in this embodiment, the third aspect
Corresponding to the shape retention ring on the hose body 34 of the rubber sleeve 8
Since 35 is provided, a predetermined bending stress can be obtained in the rubber sleeve 8 by bending, and a kink is generated between the shape-retaining ring 35 and the end so that the bending stress does not increase when a certain value or more is reached. can do.

As described above, in this embodiment, the dredging method using the dredging device according to claim 1 or 2 corresponds to claim 4 , and the set value is changed in the vicinity of the existing structure and the other. Since this is a dredging method of performing dredging, the dredging work can be efficiently performed by changing the set value according to the conditions of the dredging place.

Further, as an effect of the embodiment, since a plurality of jet nozzles 12 are arranged around the suction port 10 and the high pressure water is jetted from these jet nozzles 12, the dredging efficiency can be improved. Further, since the pressure sensor 44 as a displacement means for detecting the inclination angle θ and the horizontal displacement amount δ of the rubber sleeve 8 is provided, the load applied to the contact object T is detected by the displacement of the rubber sleeve 8, and a load equal to or more than a predetermined load is detected. It can be prevented from adding to the contact object T such as an existing structure.

9 and 10 show a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Equipment 46
In addition to the tension detecting means 21L and 21R, the moving amount detecting means 51
10 is provided as the movement amount detecting means 51.
As shown in FIG. 7, a plurality of limit switches 29, 29A, 29B, 29C are arranged in parallel at the extended position of the piston rod 24, and the plurality of limit switches 29, 29A, 29B, 29C are provided.
The amount of movement of the wire ropes 19 and 20 is detected by C at each position. In this way, the horizontal displacement amount δ and the inclination angle θ can be calculated from the movement amounts of the wire ropes 19 and 20,
The bending stress of the rubber sleeve 8 at each position can be calculated,
Since the bending stress is a load applied to the contact object T, the contact object T
It is possible to stop the swing by stopping the winches 6 and 6 before adversely affecting the swing.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, as the tension detection device, various types can be used as long as they can detect the tension of the wire. Also, in FIG. 4, the limit switch
It is also possible to make the positions of 29 variable and to detect them by disposing the limit switch 29 at a position corresponding to the horizontal displacement amount δ and the inclination angle θ. Further, the shape-retaining ring 35 only needs to be provided on the hose body 34, and the size, shape, number, position, etc. thereof can be appropriately selected.

[0028]

According to the first aspect of the present invention, a base end portion of a suction pipe swinging at an appropriate position of a dredger is provided, a suction port is provided at a tip end of the suction pipe via a flexible pipe, and one end is provided on the suction port side. In a dredging device in which a wire rod is provided at a constant tension with its end on the dredging vessel side, and a tension detection device is provided at an appropriate position of the wire rod, the tension detection device detects the tension of the wire rod, and the detected tension exceeds a set value. When this happens, a safety device to stop the swing of the suction pipe is provided, and the set value can be changed, and the flexible
The tube is a rubber sleeve, and the rubber sleeve has a predetermined angle or less.
When bent upward, and is the bending stress is approximately constant for, it is possible to set the safety device in accordance with the dredging place,
It is possible to provide a dredging device capable of improving work efficiency.

Further, the invention of claim 2 is in a proper position of the dredger.
The suction pipe that swings is provided with a proximal end, and the suction pipe is flexible at the tip.
A suction port is provided through the pipe, and one end is connected to the suction port side.
A wire rod is provided with a constant tension with its end on the dredger side, and
In a dredging device with a tension detecting device in place,
The tension detection device detects the tension of the wire and the detected tension
Is above the set value, stop the swing of the suction pipe
Equipped with a safety device that allows the set value to be changed,
And also for the detecting the bending angle of the flexible tube, in accordance with the dredging location can set a safety device, it is possible to provide a dredging apparatus capable of improving the working efficiency.

According to the third aspect of the present invention, the hose body of the rubber sleeve is provided with a shape-retaining ring, and a safety device can be set in accordance with the dredging location to improve work efficiency. It is possible to provide a dredging device capable of performing.

A fourth aspect of the present invention is a dredging method using the dredging device according to the first or second aspect , wherein the set value is changed in the vicinity of the existing structure and the other, and the dredging is performed. The safety device can be set according to the dredging location,
A dredging method capable of improving work efficiency can be provided.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a dredging device showing a first embodiment of the present invention.

FIG. 2 is a side view of a main part of the dredging device showing the first embodiment of the present invention.

FIG. 3 is a side view of the suction pipe distal end side in the up-and-down motion according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a tension detecting device showing the first embodiment of the present invention.

FIG. 5 is a block diagram around a control box showing a first embodiment of the present invention.

FIG. 6 is a sectional view of a flexible tube showing a first embodiment of the present invention.

FIG. 7 is a front view illustrating an experiment of the flexible tube according to the first embodiment of the present invention.

FIG. 8 is a graph of horizontal displacement and load obtained from an experiment of the flexible tube according to the first embodiment of the present invention.

FIG. 9 is a block diagram showing a second embodiment of the present invention.

FIG. 10 is an explanatory diagram of a main part of a movement amount detection unit showing a second embodiment of the present invention.

[Explanation of symbols]

1 Dredger 3 Suction pipe 8 Rubber sleeve (Flexible pipe) 10 Suction port 19, 20 Wire rope (Wire) 21L, 21R Tension detector 34 Hose body 35 Shape ring θ Inclination angle

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsu Kawauchi 3300, 3300, Minami-cho, Nishiminato-cho, Niigata City, Niigata Prefecture 3 Honma-gumi Co., Ltd. (56) Reference JP-A-8-26672 (JP, A) Sho 63-844 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02F 3/90

Claims (4)

(57) [Claims] 1. A wire rod having a base end portion of a suction pipe swinging at an appropriate position of a dredger, a suction port provided at the tip of the suction pipe through a flexible tube, and one end of which is on the suction port side and the other end of which is on the dredger side. In a dredging device provided with a constant tension, and a tension detecting device at a proper position of the wire rod, the tension detecting device detects the tension of the wire rod, and when the detected tension exceeds a set value, the suction pipe Equipped with a safety device to stop the swing,
The set value can be changed, and the flexible tube is a rubber sleeve.
When the rubber sleeve is bent over a predetermined angle,
Dredging apparatus bending stress is characterized that you almost constant. 2. A base of a suction pipe that swings into place on a dredger.
An end is provided, and a suction port is provided at the tip of the suction pipe through a flexible tube.
Wire rod with one end on the suction port side and the other on the dredger side.
Is installed with a constant tension, and a tension detecting device is installed at an appropriate position on the wire.
In the provided dredging device, the tension detecting device is the wire rod.
Detected tension, and the detected tension exceeds the set value
A safety device for stopping the swing of the suction pipe,
The setting value can be changed and the bending angle of the flexible tube can be detected.
Dredging apparatus according to claim that you out. 3. A dredging apparatus according to claim 1, characterized in that a shape-retaining ring hose body of the rubber sleeve. 4. A dredging method using the dredging device according to claim 1 or 2 , wherein the dredging method is performed by changing the set value in the vicinity of an existing structure and another.