JPS6114293B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention forms a pressurized air work chamber below the ceiling of the caisson body, and operates a vacuum hoe, tractor shovel, rock drill, etc. in this pressurized air work chamber. This invention relates to a pressurized caisson construction method in which excavation work is carried out using a machine, and materials, earth and sand are transported through passages provided in the ceiling of the caisson body.

``Prior Art'' Conventionally, the operator's seat of the above-mentioned work equipment is open to the pressurized air work chamber, so the operator is constantly exposed to high pressure air while working, and also has to face pressure when getting on and off the work equipment. They had to go back and forth between the lock chamber (lock), which was at atmospheric pressure, and the pressurized work chamber, which was at high pressure.

``Problem to be solved by the invention'' For this reason, there is a risk of contracting high-pressure air sickness (latency sickness), and working hours in pressurized air work rooms are strictly limited from a health and safety standpoint, which significantly reduces work efficiency. It was lowering it.

An object of the present invention is to enable the operator of a working machine to operate the machine under atmospheric pressure conditions at all times, and also to be able to get on and off the working machine without being exposed to the high pressure in the pressurized work chamber.

``Means for Solving Problems'' In the pressurized air caisson construction method of the present invention, a working machine is equipped with a pressure-resistant capsule whose interior is an airtight structure, and a hose is passed through the pressure-resistant capsule to the outside of the pressurized air work chamber. The pressure is maintained at approximately the same pressure as atmospheric pressure. Further, a haunch is provided on the upper wall of the pressure-resistant capsule, and the hatch is opened with the upper wall airtightly closing the lower end opening of the passage in the caisson body.

``Function'' Therefore, the inside of the pressure-resistant capsule, which is the operator's cab of the work equipment, can be maintained at atmospheric pressure at all times, and when getting on and off the capsule, the inside can be airtightly communicated with the passage of the caisson body. .

"Embodiments" Examples of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a caisson main body 1 is installed on foundation ground (or the seabed) 2 and forms a pressurized air work chamber 4 below a ceiling portion 3. As shown in FIG. A passage 5 is provided in the center of the ceiling 3, a lock chamber (lock) 6 is connected above the passage 5, and a hollow shaft 7 is connected above the lock chamber 6. The lock chamber 6 is divided into an upper working chamber 6a and a lower machine chamber 6b, and an upper door 8 is provided between these two chambers. Further, a lower door 10 is attached to the lower end opening 9 of the passage 5. Machine room 6
A plurality of (for example, four) capsule lifting cylinders 12 each equipped with a lifting rod 11 are vertically mounted in the cylinder b as a capsule lifting mechanism. Each suspension rod 11 slidably passes through the ceiling 3 at the periphery of the passage 5.

On the other hand, the work machine 13 assembled in the pressurized air work chamber 4 has a pressure capsule 15 mounted on a machine base 14 equipped with a caterpillar. As shown in FIG. 2, the inside of the pressure-resistant capsule 15 is an air-tight operator's cabin, with an air supply hose 16 and an exhaust hose 17.
It is maintained at atmospheric pressure by being vented to the atmosphere. A hatch 18 is provided on the upper wall of the pressure-resistant capsule 15, and an outward-opening sealing lid 19 is screwed onto the hatch 18 to airtightly close the hatch, and a sealing material 20 is attached around the periphery of the sealing lid 19. ing. Further, at the upper end of the outer surface of the peripheral wall of the pressure capsule 15, the above-mentioned suspension rod 1 on the caisson main body 1 side is attached.
A bracket 21 corresponding to 1 in a one-to-one relationship is provided in a protruding manner. Each bracket 21 is provided with a rod through hole 22 through which the suspension rod 11 can pass through, as shown in FIG. 3, and a funnel for guiding the suspension rod 11 into the rod through hole 22. A shaped guide 23 is provided in a protruding manner.
A lock pawl 24 is pivotally attached to the lower end of the suspension rod 11, and a lock release pin 25 is attached to the peripheral wall of the pressure capsule 15 so as to be slidable inside and outside. The lock pawl 24 is biased in the opening direction by a spring 26.

In FIG. 2, reference numeral 27 is a glass window, 28 is a valve, 29 is a control lever, 30 is a power cable, and 31 is a communication cable. These cables 30, 31, the air supply hose 16, and the exhaust hose 17 are as follows: The caisson body 1 is suspended from a cable suspension rail 32 attached to the lower surface of the ceiling 3 of the caisson body 1, and is movable along the cable suspension rail 32.

The driver gets on and off the work machine 13 according to the following procedure.

The pressure capsule 15 is located directly below the passage 5,
The upper door 8 is closed and the lower door 9 is opened to open the work room 6.
The worker in a is using the capsule lifting cylinder 12.
is operated to lower the suspension rod 11 so that its lower end passes through the rod through hole 22 of the bracket 21 of the pressure capsule 15, as shown in FIG. The lower end of the penetrating hanging rod 11 engages with the bracket 21 by the lock pawl 24, so that it is prevented from coming off. Next, the lifting rod 11 is raised to lift the pressure capsule 15 together with the machine base 14 as shown in FIG. 4, that is, the entire working machine 13 is lifted.
The upper wall of the pressure capsule 15 is connected to the lower end opening 9 of the passage 5.
Press it against the rim of the mouth. Since a sealing material 20 is attached to the upper wall of the pressure capsule 15, the lower end opening 9 is airtightly closed. In this state, open the upper door 8.
is opened to expose the machine room 6b and passage 5 to the atmosphere,
Open the airtight lid 19 of the hatch 18 and pressurize the capsule 1.
Enter and exit from 5. Once the operator has entered the pressure capsule 15, he closes the airtight lid 19 and the upper door 8, lowers the lifting rod 11 to lower the work implement 13 onto the foundation ground 2, and then releases the lock release pin 25.
is pushed inside the pressure capsule 15 to release the engagement between the lock pawl 24 and the bracket 21, and the suspension rod 11 is raised.

Therefore, the driver can enter and leave the pressure capsule 15 without being exposed to the high pressure within the pressurized air work chamber 4. In addition, the inside of the pressure capsule 15 is maintained at atmospheric pressure by being ventilated with the outside of the pressurized air work chamber 4 through the air supply hose 16 and the exhaust hose 17. The work equipment 13 can be operated below. When exiting from the inside of the pressure-resistant capsule 15 to the pressurized air working chamber 4, the airtight lid 19 can be easily opened by opening the valve 28 to make the inside of the pressure-resistant capsule 15 at the same pressure as the pressurized air working chamber 4.

As shown in Fig. 5, the work equipment 13 is dismantled with the pressure inside the pressurized air work chamber 4 as low as possible after the improvement of the foundation ground 2 and the pouring of the bottom concrete 33 have been partially or completely completed. Carry it out.

Next, FIGS. 6 to 8 show other embodiments. In this example, in order to suspend a plurality of work machines 13 from the ceiling part 3 of the caisson body 1 in a ceiling traveling manner, the ceiling part 3 is
Hanging rails 34 for running the working machine are attached to the lower surface and on both sides of the lower end opening 9 of the passage 5. In addition to the above-mentioned bracket 21, a cylinder base plate 35 is provided protruding from the outer surface of the peripheral wall of the pressure capsule 15, and a plurality of wheel lifting cylinders 36 are vertically mounted on the cylinder base plate 35. Tip (upper end) of piston rod 37 of each cylinder 36
A retractable wheel assembly 38 is attached to the suspension rail 3.
4, the entire working machine 13 is suspended from the suspension rail 34 so as to be movable. In addition,
The movement of the working machine 13, the lifting and lowering of the wheel assembly 38 by the cylinder 36, and the opening and closing thereof are carried out by the lock chamber 6.
This is done by remote control inside the building.

The driver gets on and off the work machine 13 suspended in this way using the following procedure.

The work machine 13 is moved until the pressure capsule 15 is located directly below the passage 5, and the lifting rod 11 is
is lowered and the work equipment 13 is suspended thereon as described above, the wheel assembly 38 is opened and lowered to release the suspension from the suspension rail 34, and then the suspension rod 11 is raised and the pressure resistant The lower end opening 9 of the passage 5 is hermetically closed with the upper wall of the capsule 15, and the sealing lid 19 is opened. To suspend the working machine 13 from the suspension rail 34 again, perform the reverse operation. In this case, the lock claw 24 of the suspension rod 11 is also released by remote control.

"Effects of the Invention" As described above, according to the present invention, the pressure inside the pressure-resistant capsule, which is the operator's cabin, can be maintained at approximately the same pressure as atmospheric pressure, so the operator of the work equipment can always operate under atmospheric pressure conditions, and The lower end opening of the passage in the caisson body is airtightly closed by the upper wall of the pressure capsule, and the hatch is opened to establish airtight communication between the inside of the pressure capsule and the passage, so the operator is exposed to high pressure in the pressurized work chamber. You can get on and off without any problems.

Therefore, it is possible to prevent hyperbaric illness, and since there is no restriction on working time in the pressurized work room, work efficiency can be improved.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a longitudinal sectional view of the whole, Figure 2 being an enlarged sectional view of the pressure capsule, and Figure 3 being an enlarged sectional view of the part that suspends the pressure capsule. Figure 4 is a vertical cross-sectional view showing the state of entering and exiting from the pressure capsule, Figure 5 is a vertical cross-sectional view showing the disassembled state of the working machine, Figures 6 to 8 show other embodiments, and Figure 6 is A vertical sectional view, FIG. 7 is a plan view showing the relationship between the pressure capsule, a suspension rail for working travel, and a passage, and FIG. 8 is an enlarged vertical sectional view showing the state in which the pressure capsule is moved in and out of the pressure capsule. 1... Caisson body, 2... Foundation ground, 3...
Ceiling section, 4... Pressurized air work room, 5... Passageway, 6...
Lock room, 6a...Work room, 6b...Machine room, 7
... Shaft, 8 ... Upper door, 9 ... Lower end opening of passage, 10 ... Lower door, 11 ... Hanging rod, 12 ... Capsule lifting cylinder, 13
... Working equipment, 14 ... Machine base, 15 ... Pressure-resistant capsule, 16 ... Air supply hose, 17 ... Exhaust hose, 18 ... Hatch, 19 ... Airtight lid, 20 ...
Seal material, 21... Bracket, 22... Rod through hole, 23... Guide, 24... Lock claw, 2
5...Lock release pin, 26...Spring, 2
7...Glass window, 28...Valve, 29...Control lever, 30...Power cable, 31...Communication cable, 32...Cable hanging reel, 33...Concrete bottom plate, 34...Hanging for running the work machine Rail, 35...Cylinder base plate, 36...Cylinder for wheel elevation, 37...Piston rod, 38...Wheel assembly.

Claims (1)

[Scope of Claims] 1. A pressurized air work chamber is formed below the ceiling of the caisson body, and excavation work, etc. is carried out using a working machine in this pressurized air work chamber, and materials are transported through a passage provided in the ceiling. In the pressurized air caisson construction method for transporting earth and sand, the work equipment is equipped with a pressure-resistant capsule with an airtight operating chamber inside, and the inside of this pressure-resistant capsule is ventilated with the outside of the pressurized air work chamber through a hose to maintain atmospheric pressure. The pressure caisson construction method is characterized in that a hatch is provided on the upper wall of the pressure capsule, and the hatch is opened with the lower end opening of the passageway being airtightly closed by the upper wall. 2. The pressure caisson construction method according to claim 1, characterized in that the pressure capsule is raised at a position below the passage and its upper wall is brought into airtight pressure contact with the lower end opening of the passage. 3. Claim 2, characterized in that the upper wall of the pressure-resistant capsule is brought into airtight pressure contact with the lower end opening of the passage by lifting the pressure-resistant capsule by lifting it by a capsule lifting mechanism attached to the caisson body. Pressurized air caisson construction method described in .