JPS6160932B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an excavator used for burying steel pipes and the like in the seabed, and has an object to enable smooth excavation when excavating seabed ground in a trench shape and to simplify the structure. The aim is to provide a submarine excavator that can do this.

Therefore, the gist of the present invention is to provide a movable base with an endless track on the bottom of the frame, and a plurality of jet nozzles at the tip of the base to connect to a high-pressure pump. An excavated soil suction unit includes an excavated part that excavates in a groove shape, an excavated soil suction port provided near the jet nozzle, and connected to a sand pump, and an excavated soil suction pipe connected to the sand pump with an exhaust port provided outside the base. The present invention includes a discharge device, and a chain plate that is rotatably erected on both sides of the base and moves while contacting the wall surface of the excavation groove.

Embodiments of the present invention will be described in detail below with reference to an excavator shown in the drawings.

FIG. 1 is a plan view of the excavator, and FIG. 2 is a side view thereof. The frame designated by reference numeral 1 has a substantially rectangular shape, and an endless track 2 is installed at the center of the lower surface of the frame 1 to constitute a base B. A hydraulic motor for driving is connected to the endless track 2 to form the base B. It makes it movable.
A plurality of jet nozzles 3 are disposed on the tip of the base B on its short side, and a high-pressure pump 4 connected to the jet nozzles 3 is provided in the center to constitute an excavation section C. The excavation section C excavates the seabed ground in a groove shape by ejecting seawater pressurized by a high-pressure pump 4 as a high-pressure jet stream from a jet nozzle 3, and a plurality of jet nozzles 3 are arranged in a vertical and horizontal direction. As it goes downward, it protrudes forward. That is, the jet nozzles 3 are arranged such that the lower sides are arranged in a horizontal line, the both sides are arranged in a vertical line, and the central part is arranged in a horizontal line. Each jet nozzle 3 has one tube section 5
The pipe section 5 is connected to the high pressure pump 4. Further, a suction port 6 is provided at the tip of the base B.
This suction port 6 surrounds the jet nozzles 3 arranged in a horizontal line in the center, and is located slightly inside the jet nozzles 3 arranged on the lower side and both sides, and is inclined to match the inclined arrangement of the jet nozzles 3 to collect the excavated soil. This makes it easier to inhale seawater.
From the suction port 6, a trap-shaped suction portion 7 that gradually narrows inward is formed, and a pipe portion 8 is connected to the narrowest end of the suction portion 7 to a sand pump 9. The sand pump 9 is driven by a hydraulic motor 10 to suck excavated soil and seawater, and
The soil is discharged through the discharge pipe 11. The earth discharge pipe 11 has one end connected to the sand pump 9 and the other end protruding outward from the base B. The suction section 7, the sand pump 9, and the earth discharge pipe 11 constitute an excavated soil suction and discharge device P, which removes the excavated soil in the excavation section C together with seawater.

At the center of both sides of the base B, a chain plate Q is erected in contact with the wall surface of the excavated groove. As shown in FIG. 3, this chain plate Q includes a crawler track 12 in which a plurality of steel flat plates are arranged in parallel and seamlessly connected.
stands on the side of the base B in two stages, and is supported so as to rotate between a drive shaft 13 provided in front and a driven shaft 14 provided in the rear. The drive shaft 13 is
A shaft joint 15 is fixed to its upper end and connected to a hydraulic motor 16 for driving. Four bearings 17 are fitted to the upper and lower ends and the middle part of the drive shaft 13 to ensure smooth rotation of the shaft, and a chain gear is installed between the bearings 17 at the upper end and the middle part, and between the middle part and the lower end. A chain 19 that fits into the chain 18 and is fixed to the inside of the crawler track 12.
mesh with. Bearings 17 are fitted on the driven shaft 14 at its upper and lower ends and in the middle, and a chain gear 18 is fitted on the drive shaft 13 at the same height as the chain gear 18 and meshes with the chain 19. The inside of the chain plate Q standing on both the left and right sides of the base B is a cover 20.
A hydraulic motor 16 that drives the chain plate Q
is arranged at the top of the cover 20. Then, the top of the base B except for the front surface is sealed with a cover that completely covers the top of the base B.

The submarine excavator having the above configuration operates in response to commands from land or from a ship at sea. That is, a control panel and a hydraulic unit for operation are installed on land or on a ship, and an operation signal is sent from there, and the high-pressure pump 4 is first activated based on this operation signal. High pressure pump 4
The seawater discharged from the jet nozzle 3 becomes a jet water flow and jets out onto the seabed ground in front of the jet nozzle 3.
The jet nozzles 3 arranged vertically and horizontally cut and collapse the seabed ground into grooves with the jet water flow therefrom, thereby dispersing the soil. The crushed ground is sucked together with seawater as excavated soil by the sand pump 9 from the suction port 6, and is discharged to the outside of the base B from the earth discharge pipe 11.

The base B moves forward by the operation of the endless track 2 as the jet nozzle 3 excavates the seabed, and at the same time, the base B moves forward.
The chain plate Q provided on the side surface rotates while contacting the wall surface of the excavated groove. The chain plate Q gives forward force to the base B while preventing the ground from collapsing. It goes without saying that the endless track 2 and the chain plate Q are interlocked, and both can be rotated not only in the forward direction but also in the backward direction.

As the excavation progresses, there is a possibility that the depth of excavation and fabric digging may change depending on the gentle slope of the seabed. Therefore, an adjustment cylinder 21 is provided at the front of the base B, and the depth is adjusted to an appropriate level by operating the adjustment cylinder 21. That is, the ejection angle of a plurality of jet nozzles 3 provided on the lower front side of the base B is changed by the adjustment cylinder 21 to adjust the elevation angle of the front part of the base B. If the excavation angle continues to increase and the excavation becomes deeper, the excavator is moved backward, the operation of the sand pump 9 is stopped, and the high-pressure pump 4 is operated to backfill the seabed with water from the jet nozzle 3.

In the above embodiment, the excavated soil is sucked and simply discharged from the soil discharge pipe 11 to the outside of the base B, but the soil discharge pipe 11 is extended to the rear of the base B,
The excavated soil from the earth removal pipe 11 is discharged into the excavated trench in which the steel pipe is embedded, and backfilling work can be performed at the same time as excavation.

As is clear from the above description, according to the present invention, the ground is excavated by jet water flow, so the structure is simpler and more waterproof than a structure in which excavation is performed by bringing a cutter into direct contact with the ground. Further, by driving the chain plate, it is possible to obtain a large propulsive force in the sea where there is a large resistance, and there is an advantage that it can move forward smoothly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a submarine excavator showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view showing a state in which a chain plate is supported. B... Base, C... Excavation section, P... Excavated soil suction and discharge device, Q... Chain plate, 1... Frame, 2...
...Endless track, 3...Jet nozzle, 4...High pressure pump, 6...Suction port, 9...Sand pump, 1
1...Earth removal pipe.

Claims (1)

[Claims] 1. A base that is movable by providing an endless track on the lower surface of the frame, an excavation section that excavates seabed ground in a groove shape by disposing a plurality of jet nozzles at the tip of the base and connecting it to a high-pressure pump, and the jet nozzles. An excavated soil suction port is provided near the base and connected to a sand pump, and the sand pump is equipped with an excavated soil suction/discharge device to which an excavated soil pipe having a discharge port is connected outside the base. A submarine excavator comprising a chain plate that is movably erected and moves while contacting the wall surface of the excavation trench.