JPH09228382A - Airtight keeping device between work room and air lock room in pneumatic caisson, its use, drill device for natural ground of the bottom of the work room - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight keeping device of a pneumatic caisson, by which a work room and an air lock room can be isolated from each other in the caisson. SOLUTION: The airtight keeping device of the invention includes a guide rail 7 fixed to the upper surface of a slab formed to be ring-shaped in a plane view, a swivel base 16 installed along the rail in such a manner as to swivel, a swivel base driving device 22, a hatch elevating plate 28 and a hatch 33. Further, the device includes a pressure proof cover 27 having a hatch opening and closing means fitted to the hatch elevating plate 28 and an elevating means for the hatch elevating plate fitted to the swivel base 16, a packing 29 for keeping air tight between the guide rail 7 and the hatch elevating plate 28, and a packing 30 for keeping air tight between the hatch elevating plate 28 and the hatch 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic caisson between a working chamber and a lock chamber in which the pressure between the working chamber and the lock chamber is made equal or a pressure difference is maintained. The present invention relates to an airtight holding device, a method of using the airtight holding device, and an excavating device for the ground at the bottom of a work chamber.

[0002]

2. Description of the Related Art A concrete slab is used to separate a working chamber of a pneumatic caisson from a lock chamber, and a hole through which a sediment bucket can pass is formed in the slab.

In recent years, with the construction of a caisson at a large depth, an excavator for excavating the ground at the bottom of a work chamber has been collected in a steel container provided on a slab.
In this case, if the caisson has a large flat surface, a rail for running the excavator is fixed to the ceiling surface of the slab on the working room side, the excavator is mounted on this rail, and the excavator is used freely, and the excavator is stored on the slab. It is also possible to set up a steel container for storage and store the excavator in this.

[0004]

However, in the case of a caisson having a small flat surface, it is difficult to mount an excavator running rail on the ceiling surface of the slab on the working room side, and to make the excavator run on the slab. There was a problem that it was not possible to install a steel container for storage and store the excavator.

[0005] In addition, a caisson having a small flat surface may not be able to secure a place for installing an excavator.
Therefore, there were also problems such as difficulty in machine digging with an excavator.

The present invention has been made in view of the above circumstances, and an object thereof is to secure a place for installing an excavator even in a caisson having a small flat surface and to store the excavator in a lock chamber. After the excavator is housed in the lock chamber, the work room in the caisson and the lock chamber are reliably shut off, and the airtightness between the pneumatic caisson work chamber and the lock chamber can maintain airtightness between the two chambers. It is to provide a holding device.

It is another object of the present invention to provide a method of using a hermetic holding device capable of fully exerting the function of the hermetic holding device according to a use situation.

Further, another object of the present invention is to provide an excavating device capable of surely excavating the ground at the bottom of the working chamber by machine with the aid of the airtight holding device even in a caisson having a small flat surface. .

[0009]

In order to achieve the above object, according to the present invention, a slab 4 formed substantially in a ring shape when viewed from a plane and provided between a work chamber 2 and a lock chamber 3 in a caisson 1 is provided. A guide rail 7 fixed to the upper surface of the vehicle, a swivel base 16 formed in a hollow disk shape and installed to be able to swivel along the guide rail 7, and a swivel base 16 is driven to swivel with respect to the guide rail 7. Swivel drive 22
A hatch elevating plate 28 formed in the shape of a hollow disk and disposed above the hole 5 provided in the slab 4 below the swivel table 16 so as to be able to ascend and descend; The divided pieces are combined to form one board, and each of the divided pieces is
A hatch 33 provided to be openable and closable in a hole 5 provided in the slab 4 below the hatch;
8, a pressure-resistant lid 27 having a hatch opening / closing means 34 attached to the swivel 16 and a hatch elevating means for a hatch elevating plate attached to the swivel 16 and a hatch elevating plate 28 of the pressure-resistant lid 27 raised Packing 29 for maintaining airtightness between guide rail 7 and hatch elevating plate 28
And a packing 30 for maintaining the airtightness between the hatch elevating plate 28 and the hatch 33 with the hatch 33 of the pressure-resistant lid 27 closed.

In order to achieve the above object, in the present invention, a hollow packing 76 having a hollow portion 77 is used for the packings 29 and 30 so that compressed air can be supplied to the hollow portion 77.

In order to achieve the above object, according to the present invention, when the swivel base 16 is swung, the hatch elevating plate 28 and the members attached thereto are lowered by the elevating means for the hatch elevating plate of the pressure-resistant lid 27. The hatch lift plate 28 is separated from the guide rail 7 by the
During the stop of the turning of the hatch, the hatch elevating plate 28 of the pressure-resistant lid 27 is
And the members attached thereto are pulled up to maintain the airtightness between the guide rail 7 and the hatch elevating plate 28 via the packing 29, the hatch 33 is closed by the hatch opening / closing means 34 of the pressure-resistant lid 27, and the hatch is The airtightness between the lifting plate 28 and the hatch 33 is maintained.

Further, in order to achieve the above object, in the present invention, the excavator revolving structure 5 is attached to the revolving base 16 of the airtight holding device.
1 and the excavator 50 is attached.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 4 show an embodiment of the airtight holding device according to the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a hatch of a pressure-resistant lid is closed, and FIG. FIG. 3 is an enlarged vertical cross-sectional view of a swivel drive unit, and FIG. 4 is an enlarged vertical cross-sectional view of a lifting unit for a hatch lifting plate.
FIG. 5 is a longitudinal sectional view showing an operation state of an excavator mounted on a swivel of the airtightness holding device via an excavator revolving body.

The airtight holding device 6 of the embodiment shown in FIGS.
Is installed on a concrete slab 4 provided between the work chamber 2 of the caisson 1 and the lock chamber 3. The caisson 1 is formed in a relatively small plane. The slab 4 has a hole 5 through which the earth and sand bucket passes.

The airtight holding device 6 includes a guide rail 7
, Swivel 16, swivel drive 22, pressure-resistant lid 27
It is comprised including.

As shown in FIG. 3, the guide rail 7 has a first rail member 8 having a substantially E-shaped cross section and a second rail member 9 made of a channel steel in contact with a web portion.
It is formed by combining together and is formed in a substantially ring shape as a whole when viewed from a plane. The guide rail 7 includes a lower flange 10 formed on the first rail member 8, a roller guide surface 11 formed on the second rail member 9, and a door stop formed on the first rail member 8. An upper flange 12 having a surface 13 and a pin gear 23 provided between the second rail member 9 and the upper flange 12 are provided. And the guide rail 7 is a slab 4
Is fixed by anchor bolts 15 with a packing 14 interposed between the upper surface of the lower flange 10 and the lower flange 10.

As shown in FIGS. 1 and 2, the swivel base 16 includes a swivel base plate 17 and a traveling roller 19.
And a guide roller 21. The turning base plate 17 is formed in a hollow disk shape when viewed from a plane, and is installed so as to be able to turn above the guide rail 7. The running roller 19 is attached to a lower portion of the turning base plate 17 via a roller bracket 18 and is installed on a lower flange of the second rail member 9 of the guide rail 7, and moves the turning base plate 17 along the guide rail 7. It is designed to run.
As shown in FIG. 5, the guide roller 21 is attached to the lower part of the swivel base plate 17 via another roller bracket 20, and is in contact with the web of the second rail member 9 of the guide rail 7. Is guided along the guide rail 7.

As shown in FIG. 3, the turntable drive device 22 includes a pin gear 23 provided between the upper flange 12 of the first rail member 8 of the guide rail 7 and the second rail member 9, It comprises a hydraulic motor 24 as a rotary drive source mounted on a base plate 17, and a pinion 26 attached to a rotating shaft 25 of the hydraulic motor 24 and engaged with the pin gear 23. Can be turned.

As shown in FIGS. 1 and 2, the pressure-resistant lid 27 is provided with a hatch elevating plate 28 and packings 29 and 3.
0, a hatch 33 formed by combining a plurality of divided pieces, a hatch opening / closing means 34, and a lifting / lowering means 41 for a hatch lifting / lowering plate.

The hatch elevating plate 28 is formed in the shape of a hollow plate when viewed from above, and the swivel base plate 1
7 and above the hole 5 of the slab 4 so as to be able to move up and down.

One of the packings 29, 30 is provided on the upper surface of the hatch elevating plate 28 near the guide rail 7 side, and when the hatch elevating plate 28 is raised, the guide rail 7 Is in contact with the lower surface of the upper flange 12 of the first rail member 8 to maintain the airtightness between the guide rail 7 and the hatch elevating plate 28. The other packing 30 is provided on the lower surface of the hatch elevating plate 28 near the hatch 33 side, and when the hatch 33 is closed, the hatch 33 is closed.
Are in contact with each other to maintain the airtightness between the hatch lifting plate 28 and the hatch 33. The packing 29 may be provided on the lower surface of the upper flange 12 of the guide rail 7, and the packing 30 may be provided on the upper surface of the guide rail 7 with the hatch 33 closed.

The hatch 33 is formed into a single disk shape by combining a plurality of divided pieces such as two in the circumferential direction. Also,
The divided pieces of the hatch 33 are attached to a hatch bracket 31 fixed to a lower portion of the hatch elevating plate 28 via pins 32 so as to be openable and closable. And hatch 33
Is arranged below the hatch elevating plate 28 so as to open and close in a hole 5 provided in the slab 4.

A plurality of sets of the hatch elevating means 34 are provided between the hatch elevating plate 28 and the hatch 33 in accordance with the number of divided pieces of the hatch 33. Each of the hatch opening / closing means 34 is provided with a hydraulic cylinder 39 attached to a bracket 35 fixed to a lower portion of the hatch elevating plate 28 through a pin 37,
3 is fixed to the lower part of the divided piece and a pin 38 is attached to the yoke 36.
And a rod 40 connected via the rod 40. The divided pieces of the hatch 33 are opened and closed by the hydraulic cylinder 39 via the rod 40.

Elevating means 41 for the hatch elevating plate
As shown in FIG. 4, a mounting table 42 fixed on the revolving base plate 17, a hydraulic cylinder 43 mounted on the mounting table 42, and a piston rod inserted into the hydraulic cylinder 43 and extending downward 44 and an inverted T-shape having a large diameter portion 45 'at the lower end, and the shaft portion is inserted through the hatch elevating plate 28 and the revolving base plate 17, and the lower end of the piston rod 44 is connected via a hinge 46. And a connecting pin 45 connected thereto. A bush 47 is interposed between the pivot base plate 17 and the shaft portion of the support pin 45, and the hatch elevating plate 28 and the support pin 45
A bush 48 is interposed between the shaft portions. The lifting means 41 raises the piston rod 44 by means of the hydraulic cylinder 43 so that the support pin 45
The hatch elevating plate 28 and the members attached thereto are raised through the large-diameter portion 45 ′, and the piston rod 44 is lowered by the hydraulic cylinder 43 and the support pin 45 is lowered. Is lowered by its own weight.

A place for excavator installation is secured on the swivel base 16, and an excavator 50 is mounted on the swivel base 16 as shown in FIG.

The embodiment of the excavator 50 shown in FIG. 5 includes an excavator revolving body 51 mounted on the revolving base plate 17 of the revolving base 16, a boom 52 hinged to the excavator revolving body 51, and a boom operation. Jack 53 and a jib 56 connected to the boom 52 via a joint 54 and a jib operation link 55 and a jib bracket 57.
And jacks 58 and 59 for jib operation, an excavating bucket 60 connected to the jib 56 via a hinge and a link 61 for bucket operation, a jack 62 for bucket operation, and the like.

In FIG. 5, the pressure-resistant lid 27 of the airtight holding device 6 is shown in a simplified manner.

Next, the operation of the airtight holding device 6 and the operation of the excavator including the excavator 50 will be described.

First, when assembling the excavator 50 when excavating the ground G at the bottom of the working chamber 2 in the caisson 1, the turntable 16 of the airtight holding device 6 is stopped. Also,
The hatch 33 of the pressure-resistant lid 27 of the airtight holding device 6 is closed. Then, the components of the excavator 50 are carried into the lock chamber 3 of the caisson 1 and assembled.

In this state, the hatch elevating plate 28 is in close contact with the lower surface of the upper flange 12 of the guide rail 7 of the airtightness holding device 6 by sandwiching the packing 29 provided on the upper surface of the hatch elevating plate 28 of the pressure-resistant lid 27. The hatch 33 is provided on the lower surface of the hatch elevating plate 28 with the packing 30 provided on the lower surface of the hatch elevating plate 28 interposed therebetween.
Of the airtight holding device 6
Thus, the work chamber 2 and the lock chamber 3 in the caisson 1 are shut off. Therefore, the lock chamber 3 is set to the atmospheric pressure so that the worker can easily work, and the work chamber 2 can be formed in a pressurized atmosphere in preparation for excavation of the ground G at the bottom of the work chamber.

After assembling the excavator 50 in the lock chamber 3, when excavating the ground G at the bottom of the work chamber of the caisson 1 by the excavator 50, the turntable 16 of the airtightness holding device 6 is used.
Need to be turned.

In this case, the hydraulic cylinder 4 constituting the lifting means 41 for the hatch lifting plate of the pressure-resistant lid 27 is used.
3, the piston rod 44 is lowered, and the support pin 45
Is lowered. As a result, the hatch elevating plate 28 and the members attached thereto are lowered by their own weight. In this state, as can be seen from FIG. 2, the hatch elevating plate 28 and the packing 29 provided on the hatch elevating plate 28 are separated from the upper flange 12 of the guide rail 7.
Can turn freely.

When excavating the ground G at the bottom of the working chamber of the caisson 1, as shown in FIG. 2, the hatch 3 of the pressure-resistant lid 27 is used.
Open 3 When the hatch 33 is opened, a hydraulic cylinder 39 of each hatch opening / closing means 34 provided below the hatch elevating plate 28 so as to correspond to the divided pieces of the hatch 33.
, The tow rod 40, and the hatch elevating plate 2
Opening operation of the divided piece of the hatch 33 hinged to the lower portion of 8.

As described above, the hatch elevating plate 28 of the pressure-resistant lid 27 and the members attached thereto are lowered, and the pressure-resistant lid 2
When the hatch 33 of 7 is opened, the working chamber 2 and the lock chamber 3 in the caisson 1 are placed under the same pressure.

Next, the excavator 50 mounted on the swivel 16 of the airtightness holding device 6 via the excavator revolving body 51.
Is introduced into the work chamber 2 through the hole 5 provided in the slab 4, and the excavator 50 excavates the ground G at the bottom of the work chamber as shown in FIG.

When excavating the ground G at the bottom of the working chamber,
Hydraulic motor 24 which is a rotary drive source of swivel drive 22
The pinion 26 is rotated by the pinion 23 provided on the guide rail 7 fixed on the slab 4 and the pinion 26, and the swivel base 16 is swung around the guide rail 7 so that the entire excavator 50 is guided by the guide rail. Turn along 7. Further, the excavator 50 itself is turned through the excavator turning body 51. Further, the boom 52, the jib 56 and the digging bucket 60
Operates in the dimensional direction. The earth and sand excavated by the excavation bucket 60 is also put into an earth and sand bucket (not shown) by a usual method, pulled up to the ground through a hole 5 provided in the slab 4, and discharged. These operations are performed by remote control from the ground.

By repeating the above operation, even if the caisson 1 has a small flat surface,
Moreover, the ground G at the bottom of the working chamber can be excavated without any gap.

After the excavation of the ground G at the bottom of the work chamber of the caisson 1, the swivel 16 of the airtight holding device 6 is stopped. Then, the excavator 50 was moved from the caisson 1 work room 2 to the lock chamber 3
The excavator 50 is stored in the lock chamber 3. After that, the piston rod 44 is raised by the hydraulic cylinder 43 of the raising / lowering means 41 for the hatch lifting plate of the pressure-resistant lid 27 of the airtight holding device 6, and the hatch lifting plate 28 and the hatch lifting plate 28 are moved by the support pins 45 connected to the piston rod 44. The attached member is raised, and a packing 29 provided on an upper surface of a hatch elevating plate 28 is sandwiched between the lower surface of the upper flange 12 of the guide rail 7 and the hatch elevating plate 2.
8 is adhered. Further, the rod 40 is extended by the hydraulic cylinder 39 of each hatch opening / closing means 34 of the pressure-resistant lid 27, and the divided pieces of the hatch 33 are rotated in the closing direction to sandwich the packing 30 provided on the lower surface of the hatch elevating plate 28. A hatch 33 on the lower surface of the hatch elevating plate 28.
Make the upper surface of the device stick. Thereby, as shown in FIG.
The work chamber 2 of the caisson 1 and the lock chamber 3 are shut off, and airtightness between the two chambers can be maintained.

As described above, after the work chamber 2 of the caisson 1 is shut off from the lock chamber 3, the pressure in the lock chamber 3 is reduced to the atmospheric pressure. Then, the worker enters the air lock chamber 3, disassembles the excavator 50, pulls it up outside the caisson 1, and removes it.

FIG. 6 is an enlarged longitudinal sectional view showing another embodiment of the lifting means for the hatch lifting plate in the hermeticity maintaining device of the present invention.

The elevating means 64 for the hatch elevating plate of the airtight holding device 6 shown in FIG. 6 has a large diameter portion 6 at the lower end.
A screw rod 65 having a 5 ', a nut 66 attached to the hatch elevating plate 28, into which the screw portion of the screw rod 65 is fitted, and a thrust bearing 67 attached just above the large diameter portion 65' of the screw rod 65 And a set of bearing covers 69,
Screw rod 65 in swivel base plate 17
A pair of a thrust bearing 68 and a bearing cover 70 attached to the insertion portion of the screw rod 65, a cross-shaped rod spanner insertion hole 72 viewed from the top on the upper end side, and a bolt and nut at the upper end of the screw rod 65. And a rotation operation member 71 connected by 73 and 74.

The lifting means 64 for the hatch lifting plate inserts a rod spanner (not shown) into a rod spanner insertion hole 72 provided on the rotation operating member 71, and passes the screw rod through the rotation operating member 71. By rotating 65 in the forward or reverse direction, the hatch elevating plate 28 can be raised or lowered by the so-called screw action of the nut 66 attached to the hatch elevating plate 28 and the screw portion of the screw rod 65. .

Therefore, the lifting / lowering means 64 shown in FIG.
If the hatch elevating plate 28 is adopted, the hatch elevating plate 28 and the members attached thereto can be manually and lightly moved up and down.

FIG. 7 is an enlarged vertical sectional view of a hollow packing portion provided between an upper flange of a guide rail and a hatch elevating plate of the airtightness maintaining device of the present invention.

The hollow packing 76 of the embodiment shown in FIG.
Is made of an elastic material such as rubber or synthetic rubber. The hollow packing 76 includes a hollow portion 77 and a flat mounting portion 78. The inside of the hollow portion 77 is connected to a compressed air supply (not shown) through a hose 79,
The inside of the hollow portion 77 can be filled with compressed air to be enriched.

The hollow gasket 76 is provided between the upper flange 12 of the guide rail 7 and the hatch elevating plate 28.
Then, the mounting portion 78 is mounted by a fixing means 80 such as a bolt, a rivet or an adhesive.

A spacer 81 is mounted near the hollow packing 76 so that the hollow portion 77 is not crushed beyond a predetermined height.

When the hollow packing 76 is employed, the pressure of the compressed air to be introduced into the hollow portion 77 is adjusted so that the gap between the upper flange 12 of the guide rail 7 and the hatch elevating plate 28 and between the hatch elevating plate 28 and the hatch 33 can be suitably sealed with an appropriate pressure. Further, if this hollow packing 76 is adopted for maintaining the airtightness between the upper flange 12 of the guide rail 7 and the hatch elevating plate 28, the swivel 16 of the airtightness maintaining device 6 can be used.
When it is necessary to rotate the guide rail 7 by contracting the hollow portion 77 of the hollow packing 76.
Since the upper flange 12 and the hatch elevating plate 28 can be separated, the elevating means for the hatch elevating plate can be omitted.

[0050]

As described above, in the airtight holding device of the present invention, the upper surface of the slab 4 which is formed in a substantially ring shape when viewed from the top and which is provided between the working chamber 2 and the lock chamber 3 in the caisson 1. , A swivel base 16 formed in a hollow disk shape and installed to be able to swivel along the guide rail 7, and a swivel for swiveling the swivel base 16 with respect to the guide rail 7. A table driving device 22, a hatch elevating plate 28 formed in a hollow disk shape and arranged to be able to ascend and descend above the hole 5 provided in the slab 4 below the swivel 16; A hatch 33 which is divided and formed into a single board in a state in which the divided pieces are combined, and which can be opened and closed in the hole 5 provided in the slab 4 below the hatch elevating plate 28. When The hatch opening and closing means 24 attached to the hatch elevating plate 28, the swivel deck 16
A pressure-resistant lid 27 having a lifting means for the hatch lifting plate attached to the, and a packing for maintaining airtightness between the guide rail 7 and the hatch lifting plate 28 in a state where the hatch lifting plate 28 of the pressure resistant lid 27 is raised. 29,
With the hatch 33 of the pressure-resistant lid 27 closed, the hatch lifting plate 28 and the packing 30 for maintaining the airtightness between the hatch 33 are provided. There is an effect that a place for installing the excavator 50 is secured, and the excavator 50 is stored in the lock chamber 3 in the caisson 1, and the excavator 5 is placed in the lock chamber 3.
After storing 0, the working chamber 2 in the caisson 1 is covered by the pressure-resistant lid 27.
Since the work room 2 can be kept in a pressurized state, the work room 2 can be depressurized to the atmospheric pressure, and the worker can assemble the excavator 50 in this work room 3 by keeping the work room 2 under atmospheric pressure. In addition, there is an effect that the work of servicing, disassembling, and removing can be performed safely, and there is also an effect that a problem caused by depressurization of the working chamber 2 can be prevented.

Further, according to the present invention, the packing 29, 30 has a hollow packing 7 having a hollow portion 77.
6, the compressed air can be supplied to the hollow portion 77. Therefore, the airtightness between the guide rail 7 and the hatch elevating plate 28, the hatch elevating There is an effect that the airtightness between the plate 28 and the hatch 33 can be maintained in a suitable state, respectively. In particular, when the airtightness maintaining device between the upper flange 12 of the guide rail 7 and the hatch elevating plate 28 is employed, When the rotary member 16 is turned, the hollow portion 77 of the hollow packing 76 is contracted, so that the upper flange 12 of the guide rail 7 and the hatch lift plate 2
8 can be cut off, so that there is also an effect that the lifting means for the hatch lifting plate can be omitted.

According to the method of using the airtight holding device of the present invention, when the swivel table 16 is swung, the hatch elevating plate 28 and the members attached thereto are lowered by the elevating means for the hatch elevating plate of the pressure-resistant lid 27. The hatch elevating plate 28 from the guide rail 7
6, the hatch elevating plate 2 of the pressure-resistant lid 27 is stopped.
8 and the members attached thereto are pulled up to maintain the airtightness between the guide rail 7 and the hatch elevating plate 28 via the packing 29, and the hatch 33 is closed by the hatch opening / closing means 34 of the pressure-resistant lid 27, and the packing 30 is Since the airtightness between the hatch elevating plate 28 and the hatch 33 is maintained, there is an effect that the function of the airtightness maintaining device 6 can be sufficiently exhibited according to the use situation.

Further, in the excavator of the present invention, since the excavator 50 is attached to the swivel base 16 of the airtightness retaining device 6 via the excavator revolving structure 51, the airtightness retaining device 6 can be used even in a caisson having a small flat surface. Work room 2 with support from
There is an effect that the natural ground G at the bottom of the can be reliably machined.

[Brief description of drawings]

FIG. 1 shows an embodiment of an airtightness maintaining device of the present invention.
It is a longitudinal cross-sectional view in the state where the hatch of the pressure-resistant lid was closed.

FIG. 2 is a longitudinal sectional view of the airtightness holding device shown in FIG. 1 in a state where the hatch is opened.

FIG. 3 is an enlarged vertical sectional view of a swivel drive unit of the airtight maintenance device shown in FIG.

FIG. 4 is an enlarged vertical sectional view of an elevating means for a hatch elevating plate of the airtightness holding device shown in FIG. 1;

FIG. 5 is a longitudinal sectional view showing an operating state of the excavator of the present invention in which an excavator is attached to a swivel of the airtight holding device.

FIG. 6 is an enlarged longitudinal sectional view showing another embodiment of the lifting means for the hatch lifting plate in the hermeticity maintenance device of the present invention.

FIG. 7 is an enlarged vertical sectional view of a hollow packing portion for maintaining airtightness between an upper flange of a guide rail and a hatch elevating plate of the airtightness maintaining device of the present invention.

[Explanation of symbols] 1 Caisson 2 Working chamber 3 Air lock chamber 4 Slab 5 Hole through which a sand bucket passes G Ground at the bottom of working chamber 6 Airtight holding device 7 Guide rail 10 Lower flange of guide rail 11 Roller guide surface of guide rail 12 Upper flange of guide rail 16 Swivel base 17 Swivel base plate 19 Traveling roller 21 Guide roller 22 Swivel base drive device 23 Pin gear 24 Hydraulic motor as a rotation drive source 26 Pinion 27 Pressure-resistant lid 28 Hatch lift plate 29, 30 Packing 33 Hatch 34 Hatch Opening / closing means 39 Hydraulic cylinder for hatch opening / closing means 40 Rod for hatch opening / closing means 41 Lifting means for hatch lifting plate 43 Hydraulic cylinder for lifting means 44 Piston rod for lifting means 45 Supporting pin for lifting means 50 Excavator 51 Excavator swinging body 52Form 56 Jib 60 Drilling bucket 64 Lifting means for hatch lifting plate 65 Screw rod of lifting means 66 Nut of lifting means 71 Rotating operation member of lifting means 76 Hollow packing 77 Hollow packing hollow part 79 Hollow part and compressed air supply source Hose connecting to

Claims (4)

[Claims] 1. A guide rail 7 fixed to the upper surface of a slab 4 which is formed in a substantially ring shape when seen from a plane and is provided between a working chamber 2 and a lock chamber 3 in a caisson 1, and a hollow disc shape. A swivel base 16 formed on the guide rail 7 so as to swivel along the guide rail 7, a swivel drive device 22 that swivels the swivel base 16 with respect to the guide rail 7, and a swivel plate shape. In addition, a hatch lifting plate 28 that is vertically movable above the hole 5 provided in the slab 4 below the swivel base 16 is divided into a plurality of pieces in the circumferential direction, and the divided pieces are combined to form one A hatch 33, which is in the form of a plate and is openable and closable within the hole 5 provided in the slab 4 below the hatch lifting plate 28, is attached to the hatch lifting plate 28. Hatch opening / closing means 34 and the swivel base 16
A pressure-resistant lid 27 having a lifting means for a hatch lifting plate attached to the, and a packing for maintaining airtightness between the guide rail 7 and the hatch lifting plate 28 in a state where the hatch lifting plate 28 of the pressure-resistant lid 27 is raised. 29, and a packing 30 for maintaining airtightness between the hatch lifting plate 28 and the hatch 33 in a state where the hatch 33 of the pressure-resistant lid 27 is closed, and a working room of the pneumatic caisson, Airtight holding device between the air lock chambers. 2. The packing according to claim 1, wherein
30. An airtightness maintenance device between a working chamber and a lock chamber of a pneumatic caisson, wherein a hollow packing 76 having a hollow portion 77 is used for the hollow portion 30, and compressed air can be supplied to the hollow portion 77. 3. The airtight maintenance device between a working chamber and a lock chamber of a pneumatic caisson according to claim 1 or 2,
When the swivel 16 is swung, the hatch elevating plate 28 and the members attached thereto are pulled down by the elevating means for the hatch elevating plate of the pressure-resistant lid 27 to lower the guide rail 7.
The hatch elevating plate 28 is separated from the base plate, and while the rotation of the swivel base 16 is stopped, the hatch elevating plate 28 of the pressure-resistant lid 27 and the members attached thereto are pulled up, and the airtightness between the guide rail 7 and the hatch elevating plate 28 A method of using the airtightness maintaining device, wherein the airtightness between the hatch lifting plate 28 and the hatch 33 is maintained through the packing 30 by closing the hatch 33 by the hatch opening / closing means 34 of the pressure-resistant lid 27. 4. An airtight holding device between a working chamber and a lock chamber of a pneumatic caisson according to claim 1 or 2,
An excavator for excavating a natural rock at the bottom of a work chamber, wherein an excavator 50 is attached to a swivel base 16 of the airtight holding device via an excavator swivel body 51.