JPS6073921A - Underwater excavator - Google Patents

Abstract

PURPOSE:To perform efficient excavation of rocks and mud on the river bed and the sea bottom without making water turbid, by a method wherein a pneumatic caisson is elevatably located in an opening at the central part of a ship, and an excavating means, a draning means, and a pneumatic means are provided in the caisson. CONSTITUTION:A hole-like opening 2 is formed in the central part of a ship 1, and a casing 3, which has a closed upper part and is provided at the lower side with a cutting member 4, is elevatably mounted in the holelike opening 2. Further, a jet pump excavator 11, moved and operated by means of a manipulator 31 for control, a draining means 19 and 21 for water in the casing, and pneumatic means 24 and 5, which bring the interior of the casing into a pneumatic condition, are mounted to the interior of the casing 3. This permits dredging and excavating of rocks and mud on the river bed and the sea bottom without making a river water turbid.

Description

[Detailed Description of the Invention] Is unexploded FJA soil or soft soil in water? This relates to equipment for excavating and transporting water without polluting it.

Water pollution caused by dredging of rivers, lakes and marshes by excavating raw sand from rivers has become a major problem.

The present invention has been made in view of the above circumstances, and its purpose is to enable excavation of underwater soil without polluting rivers, improve the efficiency of jet pump excavators, and reduce the rock mud ratio. It is an object of the present invention to provide an underwater drilling device that can be significantly improved.

The present invention will be described below with full reference to the drawings. In the drawing, reference numeral 1 denotes a hull, and a hole 2 is formed in the center of the hull 1. A casing body 3 is provided in the hole 2 so as to be able to rise and fall. The cutting casing 4 is attached.

The upper flII opening portion of the casing body 3 is closed by a lid body 5. The hull 1 is equipped with an elevating cylinder 6, and the elevating cylinder 6 has 10 rods at the top of the casing body 3! This is the conclusion.

Inside the casing body 3 is a jet pump excavator +1.
A lamp plate 31'ft for operation is provided.

The operating manipulator 31 includes a running body 13 that is movably provided on a rail 12 provided on the lower surface of the lid body 5, and an arm 14 is swingably provided on the running body 13. The mounting base 15 can be mounted in the swing period 1.

An arm swing cylinder 16 is attached to the traveling body 13, and a swing cylinder 17 is attached to the arm 14. A jet pump 18 is attached to the mounting base 15,
Vacuum generator 2 via jet pump 18 hose 19
Ejected through 1- through 0? 721. The vacuum generator 2o is connected to the suction side of the high-pressure pump 22 via a pipe body 23.

A compressor 24 is installed in the hull 1 , and the discharge side of the compressor 24 communicates with the inside of the casing body 3 via a pipe 25 . A spud 26 is provided on the hull 1 so as to be movable up and down in the front, rear, left and right directions.

A ship maneuvering winch 27 and an operation room 28 are provided at the front and rear of the hull I.

Next, the operation will be explained.

When starting excavation, set the underwater drilling equipment at the excavation position. This setting is performed by winding the wire 29 from the anchor 30 provided at a different location using the ship maneuvering winch 27 and applying a tensile force to the wire 29. Note that the excavation position is controlled and determined by a computer installed in the operation room 28.

When the excavation position determination is completed, the spud 26 is lowered and the hull 1 is fixed against the water bottom GL.

Next, the hydraulic pressure source is pivoted, and the lifting cylinder 6 is fully operated.
Then, the casing body is lowered by 3 feet and the cutting casing 4 is pushed into the soil. When the pushing force becomes insufficient, the capacity of the lifting cylinder 6 is set so that the entire weight of the underwater drilling equipment can be loaded onto the cutting casing 4, so it is possible to increase the load per unit length.

The pushing amount is g+h.

H is the excavation depth, h is the soil quality and the required amount of root cutting at the water level.

Next, compressed air is fed into the casing body 3 from the compressor 24 while the water in the casing body 3 is discharged by the jet pump excavator 11 to balance the air pressure with the water pressure at the excavation depth.

When the drainage and pressurization in the casing body 3 are completed, the high-pressure pump 22 sends water under pressure to the vacuum generator 1a20 to generate a vacuum. The jet pump 1g is pushed into the excavated soil using the operating manipulator 31, excavated, and discharged.

When the excavation inside the casing body 3 is completed, water is poured into the casing body 3 to complete the excavation.

When the excavation is completed, the lifting cylinder 6vi-operates 1 and the casing body 3 and cutting casing 4"ft-
Then lift the spud 26 and return to the moving position.

The above is one cycle of excavation work.

As described in detail above, the present invention has a hole-like part 2 entirely provided in the center part of the hull l, and an upper opening part is closed in this hole-like part 2.
A jet pump excavator is provided with a cutting casing 4 for raising and lowering the casing body 3, a lifting cylinder 6 for operating the lifting and lowering movement of the casing body 3 is provided in the hull 1, and the jet pump excavator is moved and operated by an operating manipulator 31 inside the casing body 4. 11, and the hull 1 is provided with a drainage means for discharging water in the casing body I, and a pressure air generating means for bringing the inside of the casing body I into a pressurized state.

Therefore, the casing body 3 is inserted into the location to be excavated in advance, taking into account the root cutting, and the water inside the casing body 3 is drained, and the inside of the casing body 3 is pressurized to balance the water pressure until the excavation position is reached. The pump excavator 11 can excavate and remove earth, sand and sludge. For this reason, the excavated earth and sludge are under pressure, which improves the efficiency of the jet pump excavator and dramatically improves the rock-sludge ratio. Therefore, all excavation pollution can be completely prevented.

FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views of the same operation.

1#'i hull, 3Fi casing body, 4 cutting casing, 6 lifting cylinder, 11 jet pump excavator.

Applicant: Komatsu Construction Industry Co., Ltd. Agent: Patent Attorney Masaaki Yonehara Patent Attorney Hamamoto Tadashi

Claims (1)

[Claims] A hole 2 is provided in the center of the hull 1, and within this hole 2,
A casing body 3 with a closed upper opening portion is provided so as to be movable up and down, and a cutting casing 4 is provided on the lower end side of the casing body 3, and an elevating cylinder 6 for operating the elevating movement of the casing main body 3 is provided on the hull 1. A jet pump excavator 11 that is moved and operated by an operating manipulator 3I is installed in the hull 1, and a casing body 1 is installed in the hull 1.
An underwater excavation device characterized in that it is provided with a drainage means for discharging a water pipe inside the casing body 1 and a pressure generation means for bringing the inside of the casing body 1 into a pressurized state.