JPS6030816B2 - Pressurized submersible box method and its excavation machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pressurized submerged box construction method for constructing concrete structures in underwater strata or aquatic strata, and to an excavation machine used therein.

As is well known, in the pressurized submersible box construction method, a high-pressure airtight chamber (working chamber) is formed at the bottom of the submersible, high-pressure air is injected into it to remove water from the mine, and workers enter the high-pressure airtight chamber to excavate. Since this is a construction method in which the submersible is submerged during construction, there is a risk that workers may suffer from decompression sickness, and as per Article IS of the Industrial Safety and Health Act and the Hyperbaric Work Safety and Health Regulations, work during normal working hours is prohibited. According to Appended Tables 1 and 2, the time to stay under high pressure (exposure time) and depressurization time are strictly determined.

for example It is stipulated that

For this reason, it was considered impossible to carry out actual work at an atmospheric pressure of 4.0k9 or higher, that is, at a water depth of 4 skins or more, and the submerged box method was not used.

Therefore, in the present invention, the conventional working pressure is 4.0.
We are hereby proposing a pressurized submersible box construction method that can secure about 8 hours of work time per day not only when the weight is 9 kg or less, but also when the weight is 4.0 kg or more.

That is, the present invention forms a working chamber in the lower part of a concrete building, and provides an air chamber in the upper part of the working chamber, into which the lower part is connected to the working chamber and the upper part is connected to the vertical pipe (shaft) through doors. The room is equipped with a pressure control room with an observation window and an excavation machine controlled by a control device inside the pressure control room, and is configured to maintain the pressure control room at atmospheric pressure. This is a submerged box construction method characterized by operating an excavating machine to perform excavation work.

If humans stay under high pressure for a certain amount of time, they will suffer from decompression sickness when the pressure returns to atmospheric due to the nitrogen that enters their bodies.If the exposure time under high pressure could be shortened, decompression sickness would occur. This makes it possible to extend actual working hours without any hassle. The above-mentioned Sho air submersible box construction method according to the present invention makes it possible to shorten the exposure time, and extends the actual working time by keeping the worker under atmospheric pressure during excavation work. . The construction method of the present invention will be explained in detail below with reference to the drawings.

1 is a port box, 2 is a lower part that is transported to a high-pressure work room 4 through a sliding door 3, and an upper part that is transported to a vertical pipe (
A locking chamber 7 is provided at the bottom of the vertical pipe.

8 is a backhoe shovel (excavation machine) that is easy to disassemble and assemble, and is made to be controlled by a control device in a spherical pressure container 9 mounted in the driver's seat.

As shown in FIG. 2, the spherical pressure vessel 9 is equipped with an appropriately provided observation window 10, an outward-opening door 11, a pilot seat 12, and a control rod (not shown), and is connected to atmospheric pressure through a valve i3. A suitable decompression work trachea 14 and a pressurization air pipe 16 communicating with the high pressure work chamber via a valve 15 are provided.

The depressurizing exhaust pipe 14 and the cable 17 are suspended from a runner running on a rail 18 provided on the ceiling of the high-pressure work room, pass through the air chamber 2 and the shaft 6, and are pulled out to the ground.

Reference numerals 19, 20, and 21 are air inlet pipes suitable for the air chamber 2 or the high-pressure work chamber 4, 22 is an exhaust valve, and 23 is a gangway.

Next, to explain the work procedure, first, the air chamber 2 is connected to the high-pressure working chamber 4 of the submersible body 1 with a number of shafts 6.
, close the door 3, and insert the air inlet pipe 1 into the high pressure work chamber 4.
Air is injected through step 9 to remove water from the work chamber. Next, the disassembled backhoe shovel 8 and the spherical pressure-resistant container 9 are carried into a work chamber according to a well-known procedure, and roughened as shown in the figure.

The worker descends into the lock work room 7 and the high pressure work room 4 using the ramp 23 or the elevator, and the worker who descends into the high pressure work room 4 opens the door 11 and enters the spherical pressure vessel 9.

After entering the spherical pressure vessel 9, the worker closes the door 11, closes the valve 15, and opens the valve 13, exhausting the high pressure air inside the spherical pressure vessel 9 to atmospheric pressure, and making the room large. After reaching atmospheric pressure, operate the control equipment and begin excavation work.

During excavation work, the valve 15 is opened as appropriate to introduce air necessary for breathing and for ventilation.

The excavated earth and sand are discharged by alternately opening and closing the doors 3 and 5 in a known manner, and by passing through the shaft 6 and the air chamber 2 and using a bucket suspended in the high-pressure work chamber 4.

After completing the excavation work, the worker closes the valve 13, opens the valve 15, introduces high-pressure air into the spherical pressure-resistant container 9 from the air pipe 16, and leaves the high-pressure work chamber 4 after making it equal to the external pressure. Then, in the same manner as before, the lock working chamber 7 is passed through the air chamber 2.
Exit to the outside using gangway 23 or elevator.

As mentioned above, although the method of the present invention involves work inside a high-pressure chamber,
Because workers stay under atmospheric pressure, their working hours are not regulated by the Industrial Safety and Health Act and the Hyperbaric Occupational Safety and Health Regulations, making it possible to work for long hours that would have been unimaginable under the 8-hour day. This is an innovative construction method when considering work efficiency.

Furthermore, since workers are raised and lowered under atmospheric pressure, there are practical benefits such as making it possible to use a simple elevator at the same time as preventing falls. The spherical pressure vessel 9 in the embodiment has a door 11
Because it opens outward, external pressure is applied during work, and airtightness is maintained completely.

Moreover, since it is spherical, the wall thickness of the container can be made thin, and it can be provided at low cost. Furthermore, since breathing air is introduced from the high-pressure work chamber 4 through the air supply pipe 16, the structure can be made simpler than when the air is supplied from outside the submersible. In this embodiment, a pressure-resistant container 9, ie, a pressure-resistant control room, is provided in the driver's seat of the backhoe excavator, and the excavation work is carried out while checking the geological conditions inside the container, so that the excavation is carried out reliably.

Digging under the blade is also possible. Note that the pressure vessel 9 can also be used for purposes other than excavation, such as checking the work status.

Here, it has been explained that the backhoe shovel 8 and the pressure container 9 are carried in through the working air chamber, but a carrying air chamber may be provided separately.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a spherical pressure-resistant container. 1. ... Submerged body, 2... Air chamber, 3 and 5...
・Door, 4. ．． ... High pressure work chamber, 6 ... Shaft, 7 ... Lock work room, 8 ... Backhoe shovel, 9 ... Spherical pressure vessel, 10. …
...observation window, 11...door, 12...cockpit, 1
3 and 15... Valve or valve, 14...
・Exhaust pipe, 16... Air pipe, 17... Cable, 18... Rail, 19 and 20... Air pressure pipe, 21, 21... Exhaust pipe, 22...
...exhaust valve, 23... gangway. Figure 2: Ship

Claims (1)

[Claims] 1. A high-pressure working chamber is formed in the lower part of a concrete building,
At the top thereof, there is provided an air lock chamber which communicates with the high-pressure working chamber at the lower part and the vertical pipe (shaft) at the upper part through doors, and the high-pressure working chamber is connected to atmospheric pressure through an outward opening door and a valve. Equipped with a pressure-resistant control room equipped with an observation window equipped with a pressure-reducing exhaust pipe and a pressurizing air pipe connected to the high-pressure work chamber via a valve, and equipped with an excavation machine controlled by a control device in this pressure-resistant control room, A pressure submerged box construction method characterized in that the inside of the pressure control chamber is maintained at atmospheric pressure by operating the valve, and a worker operates the excavation machine from inside the pressure control chamber to perform excavation work. 2. An excavation machine equipped with a spherical pressure-resistant control chamber equipped with an observation window, an outward-opening door, a depressurizing exhaust pipe communicating with atmospheric pressure via a valve, and a pressurizing air pipe communicating with the high-pressure work chamber via a valve.