JP3971847B2 - Excavator lifting device for buried machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavating body lifting / lowering device for an embedding machine for excavating a groove in order to embed a long body such as a power cable or a communication cable on a seabed or a waterbed.
[0002]
[Prior art]
Conventionally, a method of burying a submarine cable in the seabed is known as a method of digging a groove in the seabed and laying a submarine cable in the groove and burying it. It is used.
[0003]
As the excavation mechanism of the submarine cable excavation body, a method of excavating the sediment on the seabed by jetting a water jet forward from the excavation body obliquely lowered from the aircraft towed from the seabed, and a dredging mechanism on the excavation body There is a method of burying while using excavation by the principle of agricultural implement dredging, or a method using both of them.
[0004]
In the water jet type submarine cable burial machine, as one method for raising and lowering the excavation body, as one method, a weight made of lead or the like is placed on the rear part of the excavation body, and the flow rate of the water jet ejected from the excavation body is set. By adjusting, there is a method to raise and lower the excavated body by the seafloor earth pressure.
In addition, there is a method of directly using the expansion and contraction of the cylinder by attaching a hydraulic cylinder between the buried machine main body and the excavated body.
[0005]
[Problems to be solved by the invention]
However, since the weight is placed on the rear part of the excavated body as described above, since it cannot be operated and managed remotely, it is only adjusted based on experience.
[0006]
Also, in the method of directly using the expansion and contraction of the hydraulic cylinder, if the excavated body suddenly changes (displaces) due to changes in the hardness and softness of the rock mass, it takes a few minutes (example: 1-2 minutes) There is a possibility that a force of an allowable side pressure (for example, 1.5 ton / m) or more is applied to the cable from the responsiveness of the pressure is gradually released.
[0007]
The present invention has been made to solve the above-described problems, and can precisely control the lifting and lowering of the excavated body, and appropriately escapes the reaction force that the excavated body receives from the seabed or the waterbed, and is applied to the cable. An object of the present invention is to provide an excavating body lifting device for an embedded machine that can control a lateral pressure and prevent damage to the excavating body of the embedded machine.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration.
The invention of claim 1 is an embedding machine having a water jet type excavation body, wherein the excavation body is long in the length direction with respect to the width, and is swingable with respect to the airframe about the front end axis. A link body that has a structure that can be immersed in the seabed and that is connected to the excavation body and the machine body so that the two arms can be rotated around the shaft, and between the machine body and the arm of the link body In addition, a driving cylinder device composed of a cylinder and a piston rod is provided. The cylinder device is configured such that a pair of cylinders are fixed to each other and each piston rod is rotatably fixed to each of an arm of a machine body and a link body. There is an excavating body lifting device for a buried machine.
The invention according to claim 2 is the excavating body elevating device for an embedded machine according to claim 1 , wherein the cylinder device is driven and controlled by a hydraulic circuit, and the hydraulic circuit is provided with an accumulator .
The invention according to claim 3 is characterized in that the upper arm of the link body is pivotally attached to the upper part of the fuselage, and the cylinder device is installed above the upper arm. It is an excavation body raising / lowering device of the burial machine described.
[0009]
According to the present invention, in an embedding machine having a water jet excavation body, a link body is provided between the excavation body and the airframe so that two arms are connected to each other so as to be rotatable about an axis. Since a driving cylinder device including a cylinder and a piston rod is provided between the arm and the arm, the excavating body moves up and down through the link body by driving the cylinder device. Therefore, there is an advantage that the amount of movement of the cylinder device can be set by the link ratio of the link body, as compared to directly swinging the excavated body with the cylinder device.
[0010]
In addition, the cylinder device has a pair of cylinders fixed to each other and each piston rod is fixed to each of the airframe and the arm of the link body so as to be rotatable. It can take 3 positions: the state where the cylinder device is extended and the other is contracted, and the state where both cylinder devices are extended, and the excavated body can be easily accommodated, intermediate and excavated with a relatively simple configuration. Can be set.
[0011]
Further, if the cylinder device is provided with an accumulator in the hydraulic circuit, it can be appropriately released even if a reaction force acts on the cylinder device, such as when the excavated body gets over an obstacle.
In addition, if the upper arm of the link body is pivotally attached to the upper part of the fuselage and the cylinder device is installed above the upper arm, the cylinder device can be used even when the excavated body is in the soil. Or it is above the bottom surface of the water, and sand and mud are not applied to the cylinder device, and failure can be prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is an overall explanatory view of an embedding machine according to an embodiment, FIG. 2 is a mechanism explanatory view of an excavating body lifting device of the embedding machine, and FIG. 3 is an explanatory view of each lifting state of the excavating body.
[0013]
As shown in FIGS. 1 and 2, the embedding machine 10 includes a water jet excavation body 12. The excavated body 12 is long in the length direction with respect to the width, and a plurality of water jet nozzles 14 are disposed on the lower surface portion 12a. The excavated body 12 can swing with respect to the airframe 16 and is inclined at various angles. It has a structure that can be immersed in (excavate the hole groove 26a). A plurality (three) of water supply passages 18 are provided inside the excavated body 12, and the plurality of water supply passages 18 are divided into a plurality of sets (three sets in the embodiment) in the length direction of the excavated body 12. The nozzles 14 are individually communicated with each group.
[0014]
The airframe 16 is made up of housings 20 and 20 for sliding the seabed to the left and right at intervals in the direction of traveling of the buried machine, and pipe materials that connect the left and right housings 20 and 20 in a generally portal shape when viewed from the front. It has a main body base frame 22 combined with a truss structure, and is roughly in the shape of a catamaran. A tow wire cable 16p that connects the buried machine 10 to a barge (not shown) is fixed to the front end of the machine body 16. The left and right housings 20 and 20 are provided with wheels 20 h that are pulled by barges so that they can easily travel on the unsteady rock bed on the seabed.
[0015]
The excavation body 12 is provided with a swing fulcrum shaft 24 that is positioned at the center of the width of the main body base frame 22 and is rotatably supported by the front end of the machine body 16 on the front end 12a of the excavation body 12. The rear end side can be submerged deeper into the sea floor than the side.
[0016]
Further, the excavated body 12 has a substantially box shape that is long in the front-rear direction, and the rear end portion has a shape that rises slightly rearward. And in the upper part, a cable passage having a circular cross section for guiding in a state where the submarine cable 28 to be buried is supported in a hole groove (26a) formed by excavating the seabed (26) with a water jet, The submarine cable 28 is formed so as to surround from all sides.
[0017]
In addition, there are a plurality of water jet nozzles 14 of the excavated body 12 and they are arranged in the front-rear direction in pairs in the width direction of the excavated body 12 at the same interval. In the lower part of the inner side of the excavated body 12, a different water supply passage 18 is formed for each set of nozzles 14 in the cable passage.
[0018]
In order to swing up and down the excavation body 12 (FIG. 1 shows each position of the excavation body swinging), a link structure 44 is provided between the main body base frame 22 and the rear end of the excavation body 12. And is driven by a hydraulic cylinder device 46. Further, a bendable cable guide 48 is attached to the front end portion of the excavation body 12 so that the submarine cable 28 to be laid is passed through the cable passage in the excavation body 12 and further embedded in a groove excavated at the rear. It is like that.
[0019]
The mechanism of the link structure 44 and the hydraulic cylinder device 46 is as shown in FIG. That is, the bracket 50 protrudes upward on the rear upper side of the main body base frame 22, which is partially shown in FIG. 2. A link structure 44 is provided between the excavated body 12 and the main body base frame 22 of the machine body 16 so that the two arms 44a and 44a are connected to each other so as to be rotatable about a shaft 44b.
A hydraulic cylinder device 46 composed of a cylinder 46 a and a piston rod 46 b is provided between the main body base frame 22 and the upper arm 44 a of the link structure 44. The hydraulic cylinder 46 is configured such that the tail ends of the pair of cylinders 46a and 46a are fixed to each other, and the piston rods 46b and 46b can advance and retract independently in opposite directions. At the same time, the piston rods 46b and 46b are fixed to the bracket 50 protruding from the main body base frame 22 and the upper arm 44a of the link structure 44 so as to be rotatable (shafts 52 and 54).
[0020]
In this case, the upper one piston rod 46 b in FIG. 2 is pivotally supported on the upper portion of the bracket 50, and the upper arm 44 a is coupled to the base portion of the bracket 50 by the shaft 56. Further, the front end portion of the lower arm 44 a is rotatably connected to a bracket 12 a provided on the upper portion near the rear end portion of the excavated body 12 via a shaft 58. The one cylinder 46a has an accumulator 60 (two are provided in the drawing but may be one depending on the circuit) incorporated in the hydraulic circuit 62, and the accumulator 60 controls the pressure of the hydraulic circuit 62. It can be adjusted.
[0021]
According to the embedding machine of the embodiment, at the time of operation, as shown in FIG. The hole 26a is drilled.
Since the excavating body 12 is moved up and down through the link structure 44 by driving the hydraulic cylinder device 46, the amount of movement of the cylinder is set by the link ratio of the link structure as compared to directly swinging the excavating body with the cylinder. can do.
[0022]
The hydraulic cylinder device 46 has cylinders 46a and 46a fixed to each other, and each piston rod 46b is pivotally fixed to each of the body 16 and the arm 44a of the link structure 44. Therefore, both the piston rods 46b and 46b are contracted to reduce the link-shaped vee-shaped opening angle θ to the smallest (accommodated state of the excavated body 12 shown in FIG. 3), and one piston rod 46b is extended to the other. The piston rod 46b is contracted to make the opening angle θ intermediate (the intermediate state of the excavated body 12 shown in FIG. 4), and both the piston rods 46b are extended to make the opening angle θ maximum (FIG. 5). 3), and the position of the excavated body 12 can be set with a relatively simple configuration.
[0023]
Further, since the cylinder device 46 is provided with an accumulator in the hydraulic circuit of the upper cylinder, the pressure applied to the cable can be adjusted and the reactivity is better than that of an ordinary hydraulic release mechanism. You can avoid it. Further, even when a reaction force acts on the cylinder device, such as when the excavation body hits an obstacle, it can be appropriately released, and since an excessive force is not applied, the excavation body 12 can be prevented from being damaged. In other words, the upper cylinder 46a has a function as a shock absorber in addition to the lifting function, and the lower cylinder 46b is dedicated to the lifting function.
[0024]
Further, the upper arm 44a of the link structure 44 is pivotally attached to the upper end portion of the airframe 16, and the cylinder device 46 is installed above the upper arm 44a, so that the excavated body 12 is in the soil. Even in this case, the cylinder device is above the surface of the seabed 46, and sand and mud are not applied to the cylinder device 46, so that failure can be prevented, and there is no fear of oil leakage due to breakage of the cylinder device.
[0025]
In the above embodiment, the preferred example of the present invention has been described, but the present invention is not limited to this. For example, it can be used to embed a cable in the bottom of the water.
[0026]
【The invention's effect】
As described above, according to the present invention, the excavation body can be finely controlled, and the reaction force received by the excavation body from the seabed or the water bottom can be appropriately released to control the side pressure applied to the cable. Can be prevented.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory views of a drilled body structure of a submarine cable burying machine according to an embodiment of the present invention, as viewed from the front and side.
FIG. 2 is an explanatory view of the mechanism of the excavator lifting device.
FIG. 3 is an explanatory diagram of an excavated body in a rising end state.
FIG. 4 is an explanatory diagram of an intermediate state of the excavated body.
FIG. 5 is an explanatory diagram of a lowered state of the excavated body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Burial machine 12 Excavation body 14 Water jet nozzle 16 Machine body 22 Main body base frame 44 Link mechanism 46 Hydraulic cylinder device 46a Cylinder 46b Piston rod 50 Bracket 60 Accumulator 62 Hydraulic circuit

Claims (3)

In a buried machine having a water jet type excavation body,
The excavated body is long in the length direction with respect to the width, and has a structure that can swing about the front end axis with respect to the aircraft and can be inclined and immersed in the seabed.
Between the excavated body and the machine body, a link body that connects the two arms so as to be pivotable by an axis is provided.
A driving cylinder device consisting of a cylinder and a piston rod is provided between the airframe and the arm of the link body.
An excavating body lifting device for an embedded machine, wherein a pair of cylinders is fixed and each piston rod is rotatably fixed to each of an airframe and an arm of a link body. 2. The excavating body lifting / lowering device for an embedded machine according to claim 1 , wherein the cylinder device is driven and controlled by a hydraulic circuit, and the hydraulic circuit is provided with an accumulator .   The excavation body of an embedded machine according to claim 1 or 2, wherein the upper arm of the link body is pivotally attached to the upper part of the airframe, and the cylinder device is located above the upper arm. lift device.

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