JP3591651B2 - Pneumatic caisson - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pneumatic caisson in which a remotely operable excavator is suspended from a ceiling rail of a work room slab, and in particular, a pneumatic caisson capable of collecting the excavator into a lock chamber through an opening of the work room slab. It is about.
[0002]
[Prior art]
Conventionally, when performing foundation work on a structure, a caisson made of reinforced concrete was built, and compressed air was sent to the bottom work room, excavating and discharging earth and sand while preventing groundwater seepage, etc. Is adopted. In large or deep caissons, the compressed air delivered to the working chamber creates a large lift, which requires a weight that can withstand it. Furthermore, even when the caisson subsidence is completed, it is necessary to have a weight that can withstand buoyancy due to groundwater pressure.
[0003]
For this reason, the thickness of the caisson must be greater than the required strength, and construction materials such as reinforcing bars and concrete are used extensively, which is problematic in terms of cost.
[0004]
It has been found that such a point can be improved by reducing the pressure receiving area of the compressed air and reducing the lifting pressure by providing the working chamber not along the entire bottom but in an annular shape along the peripheral wall, This eliminates the need to increase the weight, saves construction materials, and enables cost reduction.
[0005]
[Problems to be solved by the invention]
In the pneumatic caisson, an unmanned excavation method in which an excavator is placed in a work room and the ground is excavated by remotely controlling the excavator is sometimes used. The worker has to enter the working room under high pressure, and the worker may suffer from decompression sickness, working time is restricted on working safety, and there is a problem in efficiency.
[0006]
The present invention has been made in view of such circumstances, and in a pneumatic caisson in which an excavator is arranged in a work room at a lower end, the excavator is easily collected from the work room so that the excavator can be inspected and maintained under atmospheric pressure. The purpose is to propose a possible structure.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above-mentioned problem is characterized in that in a pneumatic caisson in which a ceiling rail is laid on a ceiling of a work room composed of a work room slab and a remotely operable excavator is suspended on the ceiling rail. A lock chamber capable of accommodating the excavator is provided adjacent to an upper portion of the work chamber slab, and an opening through which the excavator can pass is provided in the work chamber slab between the lock chamber and the work chamber. A collection frame that is provided on the ceiling of the work chamber around the opening and that can be inserted into the opening from above and that can be stored in the lock chamber; Is arranged, and a part of the ceiling rail is fixed to the collection gantry, and the ceiling rail is continuously arranged so as to cross the opening by inserting the collection gantry into the opening. Features.
[0008]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the pneumatic caisson includes an annular caisson body, and the working chamber is provided in an annular shape at a lower end of the caisson body, and the annular working chamber is provided. The ceiling rail is laid in an annular shape along the line.
[0009]
According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, in a state where the door is housed in the work chamber slab around the opening, a rail mounting member is provided below the door. The work chamber slab is fixedly provided, and a part of the ceiling rail is fixed to the rail mounting member.
[0010]
According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the opening and closing door is a sliding door, and the rail mounting member is plate-shaped, and is housed in the work chamber slab around the opening. The sliding door is disposed so as to cover the lower side of the slide door in the opened state with the plate-shaped rail mounting member.
[0011]
According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, a pressure receiving means for preventing the recovery gantry from floating due to the excavation reaction force of the excavator is provided. It is characterized.
[0012]
According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, in addition to the excavator suspended on a ceiling rail of the collection gantry, the collection gantry is attached to the air lock. It is characterized by comprising lifting means capable of being lifted in a room, and a truck capable of mounting the recovery gantry in a state where the excavator is suspended.
[0013]
According to a seventh aspect of the present invention, in addition to the configuration of the fifth or sixth aspect, the pressure receiving means is a jack installed between the recovery stand and a ceiling of the lock chamber.
[0014]
According to an eighth aspect of the present invention, in addition to the configuration of the seventh aspect, the jack is provided integrally with the bogie.
[0015]
According to a ninth aspect of the present invention, in addition to the configuration according to any one of the first to eighth aspects, the collection pedestal is provided with a hanging tool that allows a sediment bucket to pass through and is suspended by the wire rope. It is characterized in that an engaging hole is provided through.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0017]
1 to 12 show a pneumatic caisson of this embodiment.
[0018]
As shown in FIGS. 2 and 3, the caisson 1 has a working chamber 3 formed annularly along the lower end of the caisson frame 2. The working chamber 3 is formed by partitioning an inner peripheral wall 7 and an outer peripheral wall 8 with a working chamber slab 5, and a cutting edge 9 is formed at a lower end of the inner and outer peripheral walls 7, 8.
[0019]
As shown in FIG. 4, between the upper slab 5 above the work chamber slab 5, the lock chamber 4, the elevating chamber 11, the manlock chamber 12, and the material lock chamber 13 are airtightly sealed by a partition wall 60. Are provided. The arrangement, number, size, and the like of these can be set as appropriate without being limited to those illustrated.
[0020]
A hatch 14 as an airtight door is provided on the partition wall 60 between the lock chamber 4 and the lift chamber 11 and on the partition wall 60 between the lift chamber 11 and the man lock chamber 12. Is installed to prevent air leakage.
[0021]
On the other hand, inside water is stored inside the caisson body 2, and a temporary wall 10 is erected from the inner peripheral wall 7 upward in the inside water. Although the upper end of the temporary wall 10 is located in the water in the drawing, the temporary wall 10 may be provided so as to extend such that the upper end of the temporary wall 10 reaches above the water surface.
[0022]
The working chamber slab 5 between each of the lock chambers 4, 4 and the working chamber 3 is provided with an opening 6 communicating between the two chambers 3, 5 as shown in FIGS. I have. A hollow shaft 16 is provided upright on the upper slab 15 of each of the lock chambers 4, 4. The shaft 16 is used for taking in and out of the excavator 22 and the excavating equipment and carrying out the excavated earth and sand. An air lock 17 for preventing the leakage of the compressed air is installed at the upper end thereof.
[0023]
As shown in FIGS. 3 and 5, a man shaft 18 is erected on the upper slab 15 of each of the elevating chambers 11, 11, respectively. The shaft 18 allows an operator to move to and from the ground, and has an elevator, stairs, and the like installed therein. That is, the elevating chamber 11, the hatch 14, and the manshaft 18 constitute a passage section through which the worker moves between the ground and the lock chamber 4.
[0024]
A material shaft 19 is erected on the upper slab 15 of each material lock chamber 13. The shaft 19 carries out excavated earth and sand by an earth and sand bucket (not shown), and an air lock 20 for preventing leakage of compressed air is installed at an upper end thereof.
[0025]
A hatch 21 is provided in each of the manlock chambers 12, 12. Inspection and maintenance of the excavator are performed by collecting the excavator in the lock chamber 4 as described later. In the case of an unrecoverable failure or accident, a worker enters the work room 3 from the hatch 21. . 3 kg / cm in the man lock chamber 12 ² In the above-described operation under high pressure, it is preferable to equip a helium mixed gas or oxygen breathing apparatus to cope with the operation under high pressure.
[0026]
The lock chamber 4 is provided with air pressure adjusting means (not shown) for supplying and discharging compressed air. That is, when compressed air is supplied to the lock chamber 4, the compressed air is sent into the working chamber 3 through the opening 6, and the pressure in the working chamber 3 is properly maintained, while closing the opening 6 as described later. When the compressed air is exhausted, only the inside of the lock chamber 4 can be brought to the atmospheric pressure. Note that the manlock chamber 12 is also provided with the same air pressure adjusting means.
[0027]
As shown in FIG. 1, a pair of ceiling rails 23 are annularly laid on the ceiling of the annular work chamber 3. A ceiling rail 23 is fixed to the work room slab 5 all around the work room 3 except for the opening 6 in the ceiling.
[0028]
A collecting stand 24 that can be fitted from above is disposed in the opening 6, and a part of the ceiling rail 23 having the same width as the ceiling rail 23 fixed to the ceiling of the work room 3 is also provided on the lower surface of the collecting stand 24. Is provided. The collection gantry 24 is fitted into the opening 6 from above, and the partial rail 25 is connected to the ceiling rail 23 fixed to the work chamber 3 by being arranged adjacent thereto.
[0029]
An excavator 22 is suspended from a pair of ceiling rails 23 provided on the ceiling of the work room 3 with a width smaller than the opening 6 so that the excavator 22 travels so that the width of the work room 3 can be excavated. Is configured. Here, since the excavator 22 is movably connected between the partial rail 25 and the ceiling rail 23 fixed to the work room 3, the excavator 22 can move all around the annular work room 3.
[0030]
The recovery gantry 24 is formed of, for example, a girder structure made of steel or the like. In this embodiment, as shown in FIGS. 6 to 8, for example, the collection gantry 24 includes projections 26 at both ends in the width direction, and these projections 26 are engaged with the step 6 a of the opening 6. . A hole 27 penetrates through the center of the collection gantry 24, and a detachable hanging tool 29 is attached to the wire rope 28 on the collection gantry 24, and the convex portion 29a of the hanging tool 29 is inserted into the hole 27 and fixed. By doing so, the collection gantry 24 can be lifted. The hole 27 of the collection gantry 24 is formed to have a size that allows a sediment bucket attached to a wire rope 28 instead of the hanging tool 29 to pass through, and the earth and sand is carried out through the hole 27 of the collection gantry 24 and the hollow shaft 16. I can do it.
[0031]
Here, it is also possible to adopt a structure in which only the work chamber 3 can be pressurized without raising the pressure in the lock chamber 4 by forming a sealing structure without providing the hole 27 in the recovery gantry 24. In this case, in order to secure a predetermined airtightness, it is preferable to provide a seal or the like at a fitting portion of the collection gantry 24 with the opening 6 or the like. In addition, since the earth and sand cannot be carried out from the opening 6, it is preferable to provide a material shaft and a material lock for carrying out the earth and sand at another position.
[0032]
The upper end of the wire rope 28 is connected to a crane or the like (not shown) on the ground through the hollow shaft 16 so that the collection gantry 24 can be lifted by the wire rope 28. The hanging tool 29 may be attracted to the collection gantry 24 by electromagnetic force, vacuum force, or the like, or may be fixed to the collection gantry 24 by a mechanical lock mechanism.
[0033]
The annular working chamber slab 5 is formed with a pair of side-hole-shaped recesses 30 each having an opening end facing the opening 6, and an opening / closing door 31 and an air cylinder 32 are respectively provided in these recesses 30, 30. Is contained. The pair of opening doors 31 are slid in the circumferential direction of the ring by the air cylinder 32 and protruded into the opening 6, whereby the opening 6 is closed in an airtight state and retracted into the recess 31. , The opening 6 is opened. A rail attachment plate 33 is attached to the lower surface of the work chamber slab 5 around the opening 6, and the open / close door 31 in the retracted state is covered by the rail attachment plate 33.
[0034]
An opening 33a having the same size as the opening 6 is formed in the rail mounting plate 33. The openings 6 and 33a are aligned, and the rail mounting plate 33 is placed over the recess 30 of the work chamber slab 5, and Both ends are fixed to the work chamber slab 5 with anchor bolts 34 (see FIGS. 7 and 8). Further, the ceiling rail 23 is firmly fixed to the rail mounting plate 33, and the excavator 22 is suspended from the ceiling rail 23 of the rail mounting plate 33 so that excavation is possible.
[0035]
Then, as shown in FIG. 9, when the collection gantry 24 is lifted by the wire rope 28 and the air cylinder 32 is operated to close the opening / closing door 31, the opening 6 is sealed. In this state, when the compressed air in the lock chamber 4 is released by the air pressure adjusting means and the pressure is reduced to the atmospheric pressure, the door 31 is pressed against the bottom surface of the concave portion 30. For this reason, it is preferable to provide a sealing material on the bottom surface of the concave portion 30 and the relative portion between the two doors 31 to ensure airtightness.
[0036]
As shown in FIG. 7, a pair of rails 35 are laid along both sides of the opening 6 on the upper surface of the working chamber slab 5, that is, the floor of the lock chamber 4, 36 travels between a position covering the upper portion of the opening 6 shown in FIGS. 9 and 11 and a position where the upper portion of the opening 6 can be completely exposed as shown in FIG.
[0037]
The carriage 36 includes a fork 37 on which the recovery gantry 24 is mounted while the excavator 22 is suspended on the partial rail 25, and a jack 38 as pressure receiving means. The forks 37 are supported by front and rear columns 39 and 40, and are disposed in a pair on the left and right along the front-rear direction. The width between the pair of forks 37 is smaller than the width of the collection gantry 24, and The excavator 22 is large enough to be disposed therebetween (see FIGS. 12 and 13). On the other hand, the jacks 38 are disposed at four positions on the front, rear, left and right of the bogie 36. Each jack 38 includes a lower jack portion 38 a hanging down from the fork 37 and an upper jack portion 38 b extending upward from the support 39. Become. The lower jack portion 38a is disposed at a position where the upper surface of the collection gantry 24 can be pressed, and the upper jack portion 38b is disposed at a position where the upper slab 15 can be pressed.
[0038]
In such a pneumatic caisson 1, excavation work is usually performed while the work room 3 is unmanned while blowing compressed air into the work room 3 to prevent the seepage of groundwater. This excavation work is performed by remotely operating the excavator 22 from the ground or the like, moving the excavator 22 on the ceiling rail 23 including the partial rail 25, and excavating the ground 50 in the work room 3.
[0039]
During this excavation work, excavated earth and sand is carried out by reciprocating a bucket (not shown) through the material shaft 19. For excavation inside the inner wall of the caisson 1, underwater excavation using a clamshell, a hammer grab, or the like is preferable (see FIG. 3). It is necessary not to dig deeper than the mouth. FIG. 3 shows a state where the bottom-filled concrete 51 is poured into the work room 3 after the settlement.
[0040]
At the time of this excavation work, the ground around the lower part of the opening 6 is also excavated. At this time, the bogie 36 is run on the rail 35 and, as shown in FIG. This positioning can be performed by detecting the position of the carriage 36 by remote control using a position detection sensor (not shown) provided in the lock chamber 4 or a monitor camera 62, for example.
[0041]
Then, at this position, the upper jack portion 38b provided on the cart 4 is extended to press the upper slab 15, and the lower jack portion 38a is extended to press the upper surface of the collection gantry 24. The excavator 22 is pressed downward from the upper slab 15 with a predetermined pressure, and in this state, the excavator 22 is suspended on the partial rail 25 of the recovery gantry 24 to excavate the ground. At this time, it is preferable that the pressing force of the upper jack portion 38b and the pressing force 38a of the lower jack are detected by a pressure sensor or the like, and the pressing force of the collection gantry 24 is adjusted to a predetermined value.
[0042]
Next, a method of collecting the excavator 22 in the lock chamber 4 for inspection and maintenance will be described.
[0043]
First, as shown in FIG. 1, the excavator 22 is moved by remote control to move the ceiling rail 23 in the same manner as in the excavation work, and is stopped and fixed immediately below the collection gantry 24, that is, the partial rail 25. At this time, in the lock chamber 4, the cart 36 is stopped at a position completely retreated from above the opening 6.
[0044]
Then, while being monitored by the monitor camera 62, the hanging tool 29 is lowered, and the projection 29 a is fitted and fixed in the hole 27 of the collection gantry 24. Next, the recovery gantry 24 is lifted together with the excavator 22.
[0045]
After the recovery gantry 24 is lifted to a predetermined height, the carriage 36 is advanced, and the forks 37 of the recovery gantry 24 are arranged above the opening 6. This position may be arranged by remote control while confirming the image by the monitor camera 62, but may be automatically determined by, for example, a sensor capable of detecting the position of the cart.
[0046]
Then, when the forks 37, 37 have completely sunk below the position where the partial rails 25, 25 of the recovery platform 24 are sandwiched, the carriage 36 is stopped (see FIG. 9). Next, the collection gantry 24 is lowered and placed on the forks 37, 37. At this time, since the recovery gantry 24 has a substantially U-shape in plan view, the excavator 22 suspended on the partial rail 25 of the recovery gantry 24 can be disposed between the forks 37.
[0047]
When the collection gantry 24 is lowered and placed on the forks 37, 37, the hanging tool 29 is separated from the collection gantry 24, and the cart 36 is retracted from the opening 6 as shown in FIG. Inspection and maintenance of the excavator 22 are performed. Prior to this inspection and maintenance, the air cylinder 32 is driven to close the opening / closing door 31, the working chamber 3 and the lock chamber 4 are air-tightly separated, and the air pressure adjusting means is used to adjust the inside of the lock chamber 4 to atmospheric pressure. Reduce pressure. When the pressure inside the lock chamber 4 is reduced to the atmospheric pressure, the worker may open the hatch 14 and enter the lock chamber 4 from the elevating chamber.
[0048]
When the inspection and maintenance are completed, the excavator 22 can be returned to the work room 3 in the reverse order of the above. The cart 36 is moved again to a position immediately above the opening 6 so that each jack 38 is extended and installed between the upper surface of the collection gantry 24 and the ceiling 4a of the lock chamber 4 (see FIG. 11).
[0049]
According to such a pneumatic caisson 1, the inspection and maintenance of the excavator 22 can be performed in the lock chamber 4 under the atmospheric pressure. Therefore, the work time is not restricted and the work efficiency is greatly improved.
[0050]
Since the partial rail 25 which is a part of the ceiling rail 23 is fixed to the collection stand 24 inserted into the opening 6, the ceiling rail 23 can be laid across the opening 6 and excavation can be performed. The excavator 22 can be easily collected in the lock chamber 4 from the traveling and excavation positions of the excavator 22.
[0051]
Further, it is not necessary to provide an opening for collecting the excavator 22 into the lock chamber 4 separately from the track of the ceiling rail 23, and it is not necessary to separately arrange a collecting rail or the like, so that the equipment can be simplified.
[0052]
Further, in a caisson having a work chamber whose width is so narrow that it is difficult to provide the opening 6 separately from the ceiling rail 23, for example, in the annular caisson of this embodiment, the opening is provided on the track of the ceiling rail 23. Therefore, it can be collected in the lock chamber 4 and can be suitably used for a caisson having a narrow working chamber.
[0053]
In addition, in the pneumatic caisson 1 having the work chamber 3 having a narrow width, there is a case where there is no space for accommodating the door 31 between the opening 6 and the inner and outer peripheral walls 7, 8. Is located on the track of the ceiling rail 23. In particular, in the case of the opening / closing door 31 that is opened and closed by sliding, the accommodation space for the opening / closing door 31 tends to be large, and the door 31 is likely to be located on the track of the ceiling rail 23. Even in such a case, if the rail mounting plate 33 is fixed to the work room slab 5 so as to cover the lower part of the opened and closed door 31 and the ceiling rail 23 is fixed to the rail mounting plate 33, the ceiling rail 23 can be secured.
[0054]
Furthermore, since the lift chamber 11 is arranged adjacent to the side of the lock chamber 4 and these chambers 4 and 11 are communicated via the hatch 14, the volume of the lock chamber 4 can be reduced, and The air pressure can be adjusted in a short time, and the working efficiency is further improved.
[0055]
Further, since the excavator 22 is raised and lowered through the wire rope 28 on the hollow shaft 16 erected on the upper slab 15 of the lock chamber 4, there is no need to dispose a lifting device in the lock chamber 4. Not only can a sufficient inspection space for the excavator 22 be secured, but also there is an effect that the excavating equipment can be easily taken in and out of the work room 3.
[0056]
Further, since the work room 3 is annular, a ceiling rail 23 and a partial rail 25 are provided on a circular track along the work room 3, and an excavator 22 capable of excavating the width of the work room 3 is suspended on the partial rail 25. Since the work chamber 3 can be excavated only by excavating the excavator 22 by moving the excavator 22 forward or backward, the excavator 22 can be controlled more easily.
[0057]
As shown in FIG. 11, since the recovery gantry 24 is pressed by the jack 38, even if the excavator 22 is excavated while the excavator 22 is suspended on the partial rail 25 of the recovery gantry 24, the excavation reaction force from the excavator 22 Can be received by the jack 38, and the recovery gantry 24 can be prevented from being lifted by the excavation reaction force, so that reliable excavation can be performed.
[0058]
Further, since the recovery gantry 24 is lifted together with the excavator 22 to the lock chamber 4 and the recovery gantry 24 is placed on the trolley 36, the recovery of the excavator 22 into the lock chamber 4 is facilitated, and the work time is reduced. Useful for shortening.
[0059]
Further, since the jack 38 is integrally provided on the cart 36, the collection gantry 24 can be easily attached to and detached from the opening 6 and workability is further improved.
[0060]
Furthermore, since the collection rack 24 allows a soil bucket to pass therethrough and penetrates the hole 27 in which the convex portion 29a of the hanging tool 29 suspended by the wire rope 28 is engaged, the hanging tool 29 is It is possible to exchange the bucket with a bucket and pass it through the hole 27 of the recovery stand 24 to carry out the excavated earth and sand.
[0061]
Although one embodiment of the present invention has been described, the present invention is not limited to this.
[0062]
For example, in the above-described embodiment, an example of an annular caisson has been described. However, a caisson of another shape such as a rectangular caisson may be used, and a ceiling rail for traveling of the excavator 22 is laid so as to cross the opening 6. The present invention can be similarly applied to any caisson to be used.
[0063]
Further, in the above embodiment, the pair of opening / closing doors 31 slidable in the circumferential direction is provided in the opening 6. However, the number of the opening / closing doors may be one, and further, the direction intersecting with the circumferential direction, That is, an opening / closing door that slides in a direction intersecting with the ceiling rail may be used. In addition, it is also possible to mount a double door type door instead of the sliding door.
[0064]
【The invention's effect】
As described above, according to the first aspect of the present invention, a lock chamber capable of accommodating an excavator is provided adjacent to an upper portion of a work chamber slab, and a work chamber between the lock chamber and the work chamber is provided. The slab is provided with an opening through which the excavator can pass, and a collection rack that can be inserted from above and that can be accommodated in the lock chamber is disposed in the opening, and a part of the ceiling rail is fixed to the recovery rack. Therefore, the ceiling rail can be laid so as to cross the opening of the work room slab, and the excavator can be easily collected in the lock chamber from the traveling and excavation position of the excavator. Further, since there is no need to provide an opening for collecting the excavator into the lock chamber separately from the track of the ceiling rail, there is no need to separately arrange a collecting rail or the like, and the equipment can be simplified. Further, since there is no need to provide an opening separately from the track of the ceiling rail, the excavator can be collected in the lock chamber even from a narrow working room.
[0065]
In particular, in the case of a pneumatic caisson in which the working chamber is provided annularly at the lower end of the annular caisson body as in the invention described in claim 2, the width of the working chamber is likely to be narrow, so that the excavator needs to be operated carefully. It is easy and easy to provide an opening for collecting into the lock chamber, which is preferable.
[0066]
Further, according to the third or fourth aspect of the present invention, the rail mounting member is fixed to the work chamber slab below the open / close door in a state where the open / close door is housed in the work room slab around the opening. When the door is located on the rail of the ceiling rail due to the lack of space for accommodating the door at the opening because the part of the ceiling rail is fixed to the rail mounting member. Even so, the supporting strength of the ceiling rail can be ensured.
[0067]
According to the invention of claim 5, even when excavation is performed in a state where the excavator is suspended on the rail of the recovery gantry, excavation reaction force from the excavator can be received by the jack and the lifting of the recovery gantry can be performed. Prevention and reliable excavation are possible.
[0068]
According to the invention of claim 6, the excavator can be easily collected in the lock chamber, which contributes to shortening the working time.
[0069]
According to the seventh aspect of the present invention, the structure of the pressure receiving means is simplified, which is advantageous in cost.
[0070]
According to the invention of claim 8, attachment and detachment of the jack to and from the opening of the collection gantry become easy, and workability is further improved.
[0071]
According to the ninth aspect of the present invention, it is possible to replace the hanging tool suspended on the wire rope with the earth and sand bucket, and to carry out the excavated earth and sand through the hole of the collection stand, and to carry out the excavated earth and sand. Increase, and work efficiency is improved.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the vicinity of an opening provided in a partition of a working chamber and a lock chamber in a pneumatic caisson according to an embodiment of the present invention.
FIG. 2 is a view showing a caisson buried underground in the embodiment, and is a cross-sectional view taken along line CC of FIG. 5;
FIG. 3 is a view showing a caisson buried underground in the embodiment, and is a cross-sectional view taken along line DD of FIG. 5;
FIG. 4 is a sectional view taken along line AA of FIG. 2 showing the caisson of the embodiment.
FIG. 5 is a sectional view taken along line BB of FIG. 2 showing the caisson of the embodiment.
FIG. 6 is a view showing a part of FIG. 1 showing the caisson of the embodiment, showing a state in which the excavator is moved.
FIG. 7 is a sectional view taken along line EE of FIG. 6 showing the caisson of the embodiment.
FIG. 8 is a sectional view taken along line FF of FIG. 6 showing the caisson of the embodiment.
FIG. 9 is a diagram showing a process of collecting the caisson excavator of the embodiment into the lock chamber.
FIG. 10 is a diagram showing a state in which the caisson excavator according to the embodiment is recovered in the lock chamber.
FIG. 11 is a diagram showing a state in which the caisson excavator of the embodiment is returned to a work room.
FIG. 12 is a front view showing the cart of the caisson of the embodiment.
FIG. 13 is a side view of FIG. 12 showing the caisson of the embodiment.
FIG. 14 is a plan view of FIG. 12 showing the caisson of the embodiment.
[Explanation of symbols]
1 Pneumatic caisson
2 caisson frame
3 Working room
4 lock chamber
5 Workroom slab
6 opening
6a Step
7 Inner wall
8 Outer side wall
9 cutting edge
11 elevator room
14 Hatch
15 Upper slab
16 Hollow shaft
17 Airlock
18 man shaft
19 Material shaft
22 excavator
23 ceiling rail
24 Collection stand
25 part rail
26 protrusion
27 holes
28 wire rope
29 Hanging equipment
30 recess
31 Door
32 air cylinder
33 Rail mounting plate
35 rails
36 trolley
37 fork
38 jack
60 partition

Claims (9)

In a pneumatic caisson in which a ceiling rail is laid on the ceiling of a work room composed of a work room slab and a remotely operable excavator is suspended on the ceiling rail,
A lock chamber capable of accommodating the excavator is provided adjacent to an upper portion of the working chamber slab,
An opening through which the excavator can pass is provided in the working chamber slab between the lock chamber and the working chamber, and an opening / closing door capable of closing the opening in an airtight manner is provided around the opening around the opening. Arranged on the ceiling of the room,
A recovery platform that can be inserted into the opening from above and that can be accommodated in the lock chamber is disposed, and a part of the ceiling rail is fixed to the recovery platform.
The pneumatic caisson wherein the ceiling rail is continuously arranged so as to cross the opening by inserting the collection gantry into the opening. The pneumatic caisson is provided with an annular caisson body, the work chamber is provided in an annular shape at a lower end of the caisson body, and the ceiling rail is laid in an annular shape along the annular work chamber. Item 2. A pneumatic caisson according to Item 1. In a state in which the door is housed in the working room slab around the opening, a rail mounting member is fixed to the working room slab below the opening and closing door, and the ceiling is attached to the rail mounting member. The pneumatic caisson according to claim 1 or 2, wherein a part of the rail is fixed. The opening and closing door is a sliding door, the rail mounting member is plate-shaped, and the plate-shaped rail mounting member is provided below the sliding door in a state of being housed in the work chamber slab around the opening. The pneumatic caisson according to claim 3, wherein the pneumatic caisson is disposed so as to cover the caisson. The pneumatic caisson according to any one of claims 1 to 4, further comprising pressure receiving means for preventing the recovery gantry from rising due to a reaction force of the excavator. Elevating means capable of lifting the recovery gantry in the lock chamber with the excavator suspended from the ceiling rail of the recovery gantry, and a dolly capable of mounting the recovery gantry in a state where the excavator is suspended. The pneumatic caisson according to any one of claims 1 to 5, further comprising: The pneumatic caisson according to claim 5 or 6, wherein the pressure receiving means is a jack provided between the recovery stand and a ceiling of the lock chamber. The pneumatic caisson according to claim 7, wherein the jack is provided integrally with the bogie. 9. The collection platform according to claim 1, wherein a hole through which a sediment bucket can pass and through which a hanging tool suspended by the wire rope engages is provided. 10. The described pneumatic caisson.

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