JPH09316901A - Excavation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an underwater place and a water surface from being contaminated with soil excavated by an excavation blade during excavation, in a conventional excavation method wherein by using an excavator having an excavation blade attached to its tip, a water bottom is excavated through rotation of an excavation blade. SOLUTION: After, through operation of a bucket 9 arranged in front of an excavator 1, soil and mud excavated by the bucket 9 are inputted in a containing space formed in the excavator 1, the containing space is sealed with the bucket 9. After soil and mud contained in the containing space are discharged on a ground or a ship through a discharge pump 13, a pipe 13a, and 13b, of which a discharge system is composed, water is fed in the containing space sealed with the bucket 9 and thereafter the bucket 9 is operated to release the containing space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavation method for constructing a subsea tunnel, for example.

[0002]

2. Description of the Related Art Conventionally, when constructing a submarine tunnel such as a submarine tunnel, for example, an excavator having an excavation blade at its tip is used to excavate the excavation blade by rotating the excavation blade to cut the water bottom.

[0003]

However, according to the method of excavating with the excavating blade as in the above-mentioned conventional technique, there is a problem that the water and the water surface are contaminated by the earth and sand scraped by the excavating blade during excavation. there were.

[0004]

The excavating method according to claim 1 of the present invention is a bucket (rotating bucket 9, hydraulic buckets 70d, 70d) provided in front of an excavator (1, 70).
・ ・ ・) Is operated to excavate the soil and mud excavated by this bucket. A storage space (1g, 70e) provided in the excavator.
This storage space was sealed with the bucket after being taken into the storage space, and the earth and sand and the mud stored in the storage space were discharged to the land or ship via the discharge system (discharge pump 13, pipes 13a, 13b). It is a thing. Further, the excavation method according to claim 2 of the present invention is the storage space sealed by the bucket after discharging the earth and sand or the like stored in the storage space as described above on the land or on the ship via the discharge system. Water is then supplied to the container, and then the bucket is operated to open the accommodation space.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. In the following, a case of excavating the seabed when constructing the seabed tunnel will be described as an example.
In each figure, reference numeral 1 is an excavator, and a head propulsion unit 2 and longitudinal cylindrical box bodies (submerged pipes) 3a to 3e ... 5 is propelled while excavating, and boxes 3a to 3e are installed at predetermined positions to construct an undersea tunnel. Head propulsion unit 2
As shown in FIG. 2, is composed of a longitudinal tubular box 2A having a propulsion mechanism on the tip side and having a tubular propulsion body 6 propelled forward by this propulsion mechanism. The tip of the box 2A has a lid 2t
Closed with a jack 7 as a propulsion mechanism on the lid 2t.
Is installed. An outer cylinder 2a is located on the front side of the box 2A, and the lid 2 is provided inside the outer cylinder 2a.
A slide rail cylinder 6a having a substrate 6b parallel to t is located, a partition wall 6t is located at the tip end side of the slide rail cylinder 6a, and a grip portion 8 projecting forward from the partition wall 6t causes the excavator 1 to move forward. A rotary bucket 9 having a C-shaped cross section provided on the tip side, that is, a shape of a substantially hemispherical outer peripheral shell is held. The rotating bucket 9 is driven so as to make a substantially reciprocating half rotation. That is, for example, a side plate (not shown) is attached to a side portion of the rotating bucket 9, the side plate is supported by a bearing, and a rotational force is transmitted to the rotating bucket 9 by a drive mechanism (not shown) on one side plate. An accommodation space 1g is formed by the grip portion 8, and the propelling body 6 is configured by the slide rail cylinder 6a and the grip portion 8. In FIG. 1, 14 is a jack and 15 is a box 3a ...
Is an operating space for supplying and draining 3e ... Propulsion, and is formed between the boxes 3a to 3e.

The hydraulic cylinder 7a of the jack 7 is attached to the base plate 6b, and the base plate 6b is propelled forward by the operation of the jack 7 to move the excavator 1 forward. And earth and sand,
As shown in FIG. 3 (a), the rotary bucket 9 is opened while the mud and seawater are taken into the accommodation space 1g.
As shown in (b), by rotating the rotating bucket 9 9
Cut into. As a result, sediment, mud 5a and seawater 11
Will be stored in the storage space 1g that is closed by the rotation bucket 9 being closed. In other words, the rotary bucket 9 is operated to take in the earth and sand and mud excavated in the rotary bucket 9 into the storage space 1g, and then the storage space 1g is sealed with the rotary bucket 9.

The seawater 11 collected in the upper part of the accommodation space 1g is
A supply connected to the upper part of the accommodation space 1g via a pipe 12a,
The water is discharged to the outside through the pipe 12b by the drainage pump 12 (see FIG. 2). In other words, these supply and drainage pumps 12
A water supply / drainage system is configured by the pipes 12a and 12b. By driving the water supply / drainage pump 12 to the drainage side, the seawater 11 is drained into the sea as shown in FIG. 3 (c). The pipe 12b has a water supply pump 12 at one end.
, And the other end is attached to the outer cylinder 2a so as to face the sea through the outer cylinder 2a, and is composed of a hose tube having a length capable of following the movement of the propulsion body 6.

Then, the earth and sand stored in the storage space 1g,
The mud 5a is discharged from the lower part of the accommodating space 1g to the land sedimentation site or the sand carrier via the head propulsion unit 2 and the boxes 3a to 3c ... That is, the discharge pump 13 is connected to the lower side of the accommodation space 1g through the pipe 13a, and the earth and sand and the mud 5a accommodated in the accommodation space 1g are piped by the discharge pump 13 to the pipe 13b.
It is discharged to the earth sedimentation site or the earth and sand carrier via the. That is, these discharge pump 13 and pipe 13
A discharge system is constituted by a and 13b, and by driving the discharge pump 13, the sediment and mud 5a are discharged to the land sedimentation site or the sediment carrier, as shown in FIG. 3 (d). As described above, since the earth and sand and the mud 5a are not dumped into the sea, the seabed can be excavated without polluting the sea.

Next, as shown in FIG. 3 (e), by driving the water supply / drainage pump 12 to the water supply side, the seawater 11
The jack 7 is contracted while taking into the storage space 1g. At this time, the box 2A is pushed forward by the propulsion jack 14 attached to the rear of the box 2A, so that the box 2A can be propelled.

Next, when the rotary bucket 9 is reversed and opened forward from the state shown in FIG. 3 (e), the accommodating space 1g was filled with seawater 11, so earth and sand and mud were vigorously accommodated together with the seawater. Entering the space 1g, seawater and sand,
The mud mixes so it doesn't pollute the sea.

At the next stage, as shown in FIG. 3 (a), the rotary bucket 9 is pressed halfway while the rotary bucket 9 is pressed, and thereafter, the same work as in FIGS. 3 (b) to 3 (e) is performed. The excavation work is advanced by repeating.

As described above, after the earth and sand and the mud contained in the accommodation space 1g are discharged to the land or on the ship via the discharge system (after FIG. 3 (d)), the accommodation space 1g sealed by the rotary bucket 9 is provided. Water is then supplied to the storage space 1g, and then the rotary bucket 9 is operated to open the storage space 1g into the sea, so that when moving to the next stage of excavation work, dirt, mud, etc. are efficiently taken into the storage space 1g. Then, since a large amount of earth and sand or mud can be excavated at one time by the rotating bucket 9 having the shape of the substantially hemispherical outer peripheral shell, the excavation work can be efficiently advanced without polluting the sea.

According to the excavation method according to the first embodiment, excavation work for constructing a subsea tunnel can be performed without polluting the underwater and water surfaces, and further, this excavation work can be efficiently advanced.

Embodiment 2 FIG. The second embodiment of the present invention will be described below with reference to FIGS. 7 in each figure
Reference numeral 0 denotes an excavator for realizing the excavation method according to the second embodiment, which is in contact with the outer periphery of the head propelling unit 2 on the tip end side of the box body 2A via the seal member 70s and has a sharp tip. 70a, a substrate 70b provided at the center of the outer cylinder 70a, and the substrate 70 attached to the partition wall 6z.
a jack 70c for pressing b and a hydraulic bucket 7 attached to the base plate 70b and positioned so as to face forward.
0d, 70d ... The earth and sand to be excavated is the earth and sand storage space 70 in which the buckets 70d are arranged side by side.
It is guided by the guide 70f in the e direction. still,
A pipe 13a is attached to the lower portion of the substrate 70b corresponding to the earth and sand storage space 70e, and the pipe 13a, the discharge pump 13, and the pipe 13b constitute a discharge system similar to that of the excavator 1 of FIG. To be done. In such a configuration, when the bucket 70d is opened while the bucket 70d is opened as shown in FIG. 4 and the pressing force is applied to the substrate 70b by the jack 70c as shown in FIG. 5, the bucket 70d closes the soil 50. The bite and the earth and sand are drawn into the accommodation space 70e and sealed. The sediment stored in the storage space 70e is sucked rearward through the pipe 13a by the function of the pump 13, and is sent to the earth sedimentation site on land via the pipe 13b or deposited on the ship.

Also in the excavation method according to the second embodiment,
After the sand and sand are once drawn into the storage space 70e by the bucket 70d and sealed, and then discharged by the discharge pump 13 to the outside of the water, the sand and sand are agitated during excavation, so
There is no such thing as polluting the water surface. Therefore, underwater,
Excavation work for building a subsea tunnel can be performed without polluting the water surface.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining an excavation method according to a first embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of an excavator for realizing the excavation method according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory diagram for explaining the excavation method according to the first embodiment of the present invention.

FIG. 4 is an internal configuration diagram of an excavator for realizing an excavation method according to a second embodiment of the present invention.

FIG. 5 is an internal configuration diagram of an excavator for realizing an excavation method according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an excavation method according to a second embodiment of the present invention.

[Explanation of symbols]

1,70 excavator, 1g, 70e accommodation space, 9 rotation bucket, 70d hydraulic bucket, 13 discharge pump (discharge system), 13a, 13b pipe (discharge system).

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hirofumi Tatsu 1-8 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Branch, Inc. No. Kumagai Gumi Tokyo Head Office (72) Inventor Ryo Nagata No. 2 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Main Office (72) Inventor Panyu Kawauchi No. 8 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Branch

Claims (2)

[Claims] 1. An excavation method for excavating soil under water with an excavator, wherein a bucket provided in front of the excavator is operated to provide the excavator with earth and sand or mud to be excavated by the bucket. The excavation method, characterized in that the storage space is sealed with the bucket after being taken into the storage space, and the earth and sand and the mud stored in the storage space are discharged to the land or on the ship via the discharge system. . 2. An excavation method for excavating soil under water with an excavator, wherein a bucket provided in front of the excavator is operated to provide the excavator with earth and sand or mud to be excavated by the bucket. After accommodating into the accommodating space, the accommodating space is sealed with the bucket, and after the earth and sand and mud contained in the accommodating space are discharged to the land or ship via the discharge system, the accommodating space sealed with the bucket. A method of excavating, characterized in that water is supplied to the container and then the bucket is operated to open the accommodation space.