JP2905339B2 - Bottom door opening and closing device in the pneumatic caisson method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom door opening and closing device in a pneumatic caisson method.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, opening and closing of a bottom door in a pneumatic caisson method is performed by connecting a bottom cylinder 10 divided in advance on the ground to a hollow cylindrical standing pipe continuous from a locking device 6 by a crane or the like. Hanging in 7,
Lower to work room 2. Then, the workers assemble together in the work room 2.

Next, the integrally assembled bottom door 10 is lifted by a wire rope 19 such as a crane, brought into close contact with the opening 4 of the ceiling slab 3, and the pressure inside the lock device 6 and the standing pipe 7 is reduced. . When the pressure in the lock device 6 and the riser 7 is reduced, a pressure difference is generated between the pressure in the work chamber 2 and the pressure in the lock device 6 and the riser 7. 4 is tightly fixed to the peripheral portion.

Next, an operator descends from the upper part of the lock device 6 through the standpipe 7 onto the bottom door 10 and
Unwind the wire rope 19 hanging the.

[0005]

The opening and closing of the bottom door in the conventional pneumatic caisson method is performed in the above-described manner. However, operations such as assembling the bottom door 10 and connecting a wire rope 19 for suspending the bottom door 10 are performed. However, since all the workers need to enter the work room 2 and perform the work manually, there is a disadvantage that the work is complicated and it takes a long time to complete the work. In addition, the working time in the working room is restricted as the sinking depth of the submersible body 1 becomes deeper, and furthermore, there is a drawback that there is a danger for work such as crane.

The present invention has been proposed to solve the above-mentioned conventional problems, and a bottom door in a pneumatic caisson method capable of safely opening and closing the bottom door without putting an operator in a work room. It is an object of the present invention to provide a switchgear.

[0007]

The bottom door opening and closing device in the pneumatic caisson method according to the present invention comprises:
A bottom door that is in close contact with a receiving ring attached to an upper end of the bottom shaft to close the upper end of the bottom shaft; a support arm that supports the bottom door in the bottom shaft; and an opening / closing device that rotates the bottom door vertically. And raising and lowering the bottom door, and
And a lifting / lowering device that is brought into close contact with the motor.

[0008]

1 is a longitudinal sectional view of an embodiment of a bottom door opening / closing device in a pneumatic caisson method according to the present invention, FIG. 2 is a transverse sectional view thereof, and FIG. 3 is a longitudinal sectional view of a caisson showing its installation position. FIG.

In the drawing, an opening 4 is provided in a ceiling slab 3 of a working chamber 2 of a submersible body 1, a bottom shaft 5 is installed on the opening 4, and the working chamber 2 and A hollow cylindrical standing pipe 7 configured to communicate with the outside via a lock device 6 provided at an upper portion is provided.

The bottom shaft 5 is hermetically fixed around the opening 4 by a plurality of anchor bolts 8. The standing pipe 7 is integrally joined to the upper end of the bottom shaft 5 by a plurality of connecting bolts 9.

In the bottom shaft 5, a bottom door 1 for closing the upper end of the integrally assembled bottom shaft 5 is provided.
0, a support arm 11 for supporting the bottom door 10 and an elevating device 13 for bringing the bottom door 10 into close contact with a receiving ring 12 attached to the upper end of the bottom shaft 5 are fixed to the inner wall of the bottom shaft 5 by support pins 14. It is installed by. The bottom door 10 can be freely opened and closed by rotating the bottom door 10 up and down around a support pin 14 by an opening and closing device 15.

The switchgear 15 has an operation power cable 16
The operation power cable 16 penetrates the side wall of the bottom shaft 5 in an airtight manner and extends to the operation panel 17 on the ground.
10 can be freely opened and closed.

An opening and closing device 15 for opening and closing the bottom door 10
A hydraulic or pneumatic power source may be used as the power source of the motor.

Next, a method of opening and closing the bottom door 10 will be described in order.

First, in order to close the bottom door 10, the opening and closing device 15 is operated by remote control on the operation panel 17 on the ground, and the support arm 11 connected to the opening and closing device 15 is supported by the support pin.
Rotate around 14 until it is almost vertical.

Next, the lifting device 13 is operated by remote control on the operation panel 17 on the ground to raise the bottom door 10 directly above and bring the bottom door 10 into close contact with the receiving ring 12. In addition, receiving ring
An airtight packing 18 is embedded in 12 so that the bottom door 10 adheres tightly to the closed state.

Next, the pressurized air in the lock device 6 and the standpipe 7 is released to reduce the pressure in the lock device 6 and the standpipe 7. When the air pressure in the lock device 6 and the vertical pipe 7 is reduced, the air pressure in the work chamber 2 and the lock device 6 and the vertical pipe 7 are reduced.
A pressure difference occurs in the internal pressure, and the bottom door 10 receives the receiving ring 12
And is fixed in close contact with the airtight packing 18.

On the other hand, in order to open the bottom door 10, the pressure in the lock device 6 and the riser 7 is increased until the pressure in the work chamber 2 becomes the same as the pressure in the work chamber 2.

Next, the elevator 13 is operated by remote control on the operation panel 17 on the ground to lower the bottom door 10, and is separated from the airtight packing 18 of the receiving ring 12.

Next, the opening / closing device 15 is operated by remote control on the operation panel 17 on the ground to move the support arm 11 to the support pin.
Rotate around 14 until it is almost horizontal.

By the above operation, the bottom door 10 can be freely opened and closed without an operator entering the work room 2.

[0022]

Since the present invention is configured as described above, it has the following effects.

The opening and closing of the bottom door is performed by an opening / closing device and an elevating device.
Is configured so that it can be done in two steps
Can open and close the bottom door more reliably
And open and close the bottom door smoothly even in tight spaces
Can be done. Also, the opening and closing of the bottom door is narrow
Opening and closing the bottom door by opening and closing the doors
The equipment and lifting equipment can be made as compact as possible.
Wear. For this reason, the bottom shaft and this bottom shaft
The standpipe installed on the upper side of the roof is removed with the switchgear and lifting device
There is no need to increase the diameter to prepare for
I can plan. Further, since the opening and closing of the bottom door can be performed by complete remote control on the ground, there is no need to open and close the bottom door by putting an operator in the working room of the submersible body.

Therefore, the bottom door can be opened and closed safely in a short time without being restricted by the work time even if the submerged body is deepened.

Further, the worker can be released from the troublesome work under pressure and can provide a comfortable working environment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a bottom door opening / closing device in a pneumatic caisson method according to the present invention.

FIG. 2 is a cross-sectional view of the bottom door opening / closing device in the pneumatic caisson method shown in FIG.

FIG. 3 is a longitudinal sectional view of the submersible body showing an installation position of a bottom door opening / closing device in the pneumatic caisson method shown in FIG.

FIG. 4 is a longitudinal sectional view of a main body of a submersible box showing a conventional method of opening and closing a bottom door in a pneumatic caisson method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Submersible box main body, 2 ... Work room, 3 ... Cover slab, 4 ... Opening, 5 ... Bottom shaft, 6 ... Locking device, 7 ... Standing pipe,
8 anchor bolt, 9 connection bolt, 10 bottom door, 11 support arm, 12 receiving ring, 13 elevating device,
14 ... support pin, 15 ... switchgear, 16 ... operation power cable,
17 ... operation panel, 18 ... airtight packing, 19 ... wire rope.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-69406 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 23/00

Claims (1)

(57) [Claims] 1. A bottom door opening / closing device according to a pneumatic caisson method, wherein the bottom door is in close contact with a receiving ring attached to an upper end of the bottom shaft to close the upper end of the bottom shaft, and the bottom door is inserted into the bottom shaft. A bottom arm in a pneumatic caisson method, comprising: a supporting arm for supporting; an opening / closing device for rotating the bottom door in a vertical direction; and a lifting / lowering device for raising / lowering the bottom door and bringing the bottom door into close contact with the receiving ring. apparatus.