JP4749014B2 - Pneumatic caisson - Google Patents

Description

  The present invention relates to a pneumatic caisson used for a pneumatic caisson method in the field of construction and civil engineering.

  The excavation work performed in the pneumatic work room by the pneumatic caisson method has a heavy physical burden on the workers. For this reason, unmanned excavation work under high pressure is being performed, but the excavator requires maintenance work by an operator. Therefore, conventionally, a pneumatic caisson where excavation work is performed using a remotely operated caisson excavator, and when necessary, the excavator is collected in a maintenance room, and an operator descends to an atmospheric pressure maintenance room to perform maintenance work. Is known (see, for example, Patent Document 1).

FIG. 2 is a front sectional view of a conventional pneumatic caisson described in Patent Document 1. In the figure, a pneumatic caisson 100A has a caisson housing 100, and a first slab portion 103 is provided at the lower part of the outer peripheral side wall 101a of the caisson housing 100. The peripheral edge portion of the first slab portion 103 forms a blade edge 102, and a portion surrounded by the lower surface of the first slab portion 103 and the blade edge 102 is a pressurized working chamber 105 for the caisson excavator 114 to perform excavation work. Form.

  An inner peripheral side wall 101b is erected on the upper part of the first slab part 103, and a second slab part 104 is provided above the first slab part 103 on the inner peripheral side of the inner peripheral side wall 101b. A pair of partition walls 106 a and 106 b are erected between the upper part of the first slab part 103 and the lower part of the second slab part 104, and the space is sandwiched between the upper part of the first slab part 103 and the second slab part 104. Among them, one side of the partition wall 106a is in the maintenance chamber 109 provided with the excavator recovery device 110, and the portion sandwiched between the partition wall 106a and the partition wall 106b is in the lift chamber 107 provided with the entrance 120a of the lift unit 120. The other side is formed in an atmospheric pressure adjusting chamber (manlock) 108 having a function of adjusting the difference between the atmospheric pressure on the ground and the pressure working chamber 105. An airtight door 113a is provided in the opening 112a that communicates the lifting chamber 107 and the maintenance chamber 109, and an airtight door 113b is provided in the opening 112b that communicates the lifting chamber 107 and the atmospheric pressure adjustment chamber 108. Confidential doors 111 are provided at the opening portions 110a that communicate with the pneumatic working chamber 105 and can be opened and closed.

  At the time of excavation work, the caisson excavator 114 is lowered into the pressure working chamber 105, and the pressure in the pressure working chamber 105 and the maintenance chamber 109 is increased from the atmospheric pressure to perform the excavation work. The excavation work is remotely operated by the control means 115a of the control room 115.

At the time of maintenance, the caisson excavator 114 is lifted from the pneumatic working chamber 105 to the maintenance chamber 109, the door 114a is closed, and the worker descends from the ground to the lifting chamber 107 by the elevator 120, and the atmospheric pressure in the maintenance chamber 109 is the same as the atmospheric pressure. Then, the worker enters the maintenance room 109 and performs maintenance of the caisson excavator 114.
Japanese Patent Laid-Open No. 2003-268779

  However, in the invention described in Patent Document 1, the lifting / lowering chamber 107, the atmospheric pressure adjustment chamber 108, and the maintenance chamber 109 must be provided in the horizontal direction between the first slab portion 103 and the second slab portion 104. In other words, the bottom area of the caisson housing 100 must be increased. When the pneumatic caisson method is used in a narrow excavation area, the maintenance chamber 109 cannot be provided, and the caisson excavator 114 cannot be sufficiently maintained, and the lift chamber 107 cannot be provided. When the maintenance chamber 109 or the pressure working chamber 105 is entered, the air pressure adjustment chamber 108 may not be provided, and when the worker enters the pressure working chamber 105, the pressure adjustment in the pressure working chamber 105 may be hindered. There's a problem.

  The present invention has been made in view of the above problems, and its purpose is to maintain the caisson excavator by a worker, raise and lower a worker entering and exiting a maintenance room, etc., and a pneumatic working chamber even in a narrow excavation area. It is to provide a pneumatic caisson that does not interfere with atmospheric pressure adjustment.

The invention according to claim 1 is a caisson excavator, a pressurized working chamber having a working space for the caisson excavator, an unloading of excavated material excavated by the caisson excavator, and members of the caisson excavator And a material shaft capable of carrying in and out of materials and equipment, a maintenance room capable of accommodating the caisson excavator, an elevating unit having an elevating unit entrance capable of raising and lowering personnel and maintaining airtightness, and the elevating unit inside A first slab portion that forms a ceiling wall of the pressure working chamber, the maintenance chamber and the lifting chamber are arranged in a vertical direction on the upper side of the pressure working chamber, and the maintenance A second slab part that forms the ceiling wall of the room and a third slab part that forms the ceiling wall of the elevator room are provided in triplicate in the vertical direction, and a ladder for raising and lowering personnel in the maintenance room is provided in the elevator room The material shaft penetrates the hoisting chamber and the third slab part, and the third slab part is provided so as to penetrate the man shaft vertically, and the first slab part has an opening for passing personnel. It is a pneumatic caisson characterized by being provided so as to penetrate the part up and down .

According to the first aspect of the present invention, the maintenance chamber that can accommodate the caisson excavator and the elevator chamber in which the entrance / exit of the elevator unit is provided are vertically disposed above the pressure working chamber for the operation of the caisson excavator. By arranging them side by side, a pneumatic caisson with a small bottom area is formed while securing a place for maintenance of the caisson excavator and a place to provide an entrance / exit of the lifting part. It is possible to realize a pneumatic caisson that can be easily repaired by a worker without causing any troubles in maintenance of the caisson excavator, lifting and lowering of workers entering and leaving the maintenance room, and adjusting the atmospheric pressure in the pressurized working chamber.
In addition, the first slab part, the second slab part, and the third slab part are provided in triplicate, the ceiling wall of the pressure working chamber is the first slab part, and the ceiling wall of the maintenance room is the second slab part. Thus, by forming the ceiling wall of the lift chamber at the third slab portion, the pressurized working chamber, the maintenance chamber, and the lift chamber can be provided in the vertical direction while being separated from each other in an airtight state.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Embodiment 1 of the Invention
A first embodiment of the present invention will be described with reference to FIG.

Figure 1 is a Ru front sectional view der pneumatic caisson in the first embodiment of the present invention.

In FIG. 1, a caisson housing 1a of a pneumatic caisson 1A has a plate-like first slab part 4 extending in the lateral direction on the lower end side of the inner peripheral part of the reinforced concrete side wall 1 extending in the vertical direction and surrounding the side surface. Is provided. The first slab part 4 is made of reinforced concrete manufactured by a precast method (hereinafter referred to as “ PC method”). An opening 11a is formed in the first slab part 4 so as to penetrate the first slab part 4 in the vertical direction, and a substantially cylindrical maintenance hatch part 11 is fitted in the inner peripheral part of the opening 11a. The inner peripheral portion of the maintenance hatch portion 11 is formed to a size that allows a caisson excavator 15 (described later) to pass through. On the upper side of the inner peripheral portion of the maintenance hatch 11, a pair of double doors 11 b and 11 b are provided so as to be openable and closable. The doors 11b and 11b seal the upper side and the lower side in an airtight state in a closed state. Furthermore, the opening part 11c is penetrated to the 1st slab part 4, and the raising / lowering hatch part 34 is inserted in the inside of this opening part 11c. The inner peripheral part of the raising / lowering hatch part 34 is formed in a size that allows personnel to pass through. On the upper side of the inner peripheral portion of the elevating hatch 34, a single-open door 35 is provided so as to be freely opened and closed. When the door 35 is closed, the upper side and the lower side are hermetically sealed.

  A space portion surrounded by the lower side of the first slab portion 4 and the inner peripheral surface of the lower portion of the side wall 1 of the caisson housing 1a is provided with a pressurized working chamber 2 which is a space for a caisson excavator 15 (described later) to perform excavation work. Form. The side wall 1 around the pressure working chamber 2 forms a blade edge 3 that is thinned downward. The lower end of the blade edge 3 forms an open end 3a. A traveling rail 36 for guiding a caisson excavator 15 (described later) is installed in the horizontal direction above the pressure working chamber 2.

Above the first slab part 4, a substantially plate-like second slab part 5 extending in the lateral direction is provided in parallel with the first slab part 4. The second slab portion 5 is also made of reinforced concrete manufactured by the PC method. An opening 5a and an opening 5b are formed in the second slab part 5 and penetrate the second slab part 5 in the vertical direction.

  A substantially cylindrical man hatch portion 12 is fitted into the inner peripheral portion of the opening 5a. The inner peripheral part of the man hatch part 12 is formed in a size that allows a human to pass through. A single-open door 12a is provided on the upper side of the inner periphery of the manhatch portion 12 so as to be opened and closed. When the door 12a is closed, the upper side and the lower side are hermetically sealed.

  The inner diameter of the opening 5 b is formed to be the same size as the outer diameter of a material shaft 16 a (described later) of the material lock 16.

  A space part surrounded by the upper side of the first slab part 4, the lower side of the second slab part 5, and the inner peripheral surface of the side wall 1 forms a maintenance chamber 7 that is a space for performing maintenance of a caisson excavator 15 (described later). To do. In the maintenance chamber 7, a ladder 10 for raising and lowering personnel is installed from the upper side of the first slab part 4 to the inner peripheral part of the manhatch part 12.

Above the second slab part 5, a substantially plate-like third slab part 6 extending in the lateral direction is provided in parallel with the second slab part 5. The third slab portion 6 is also made of reinforced concrete manufactured by the PC method. An opening 6a and an opening 6b are formed in the third slab part 6, and penetrate the third slab part 6 in the vertical direction.

  The inner diameter of the opening 6a is the same as the outer diameter of a man shaft 9 (described later) that is a lifting part, and the inner diameter of the opening 6b is the same as the outer diameter of a material shaft 16a (described later).

  A space portion surrounded by the upper side of the second slab part 5, the lower side of the third slab part 6, and the inner peripheral surface of the side wall 1 forms a lifting chamber 8. The elevating chamber 8 forms a space for elevating and lowering personnel using a man shaft 9 (described later), and adjusts the atmospheric pressure and the atmospheric pressure in the pressure working chamber 2 and the maintenance chamber 7. It also has the function as Inside the elevating chamber 8, a mixed gas / oxygen gas supply device (not shown) for supplying various gases into the chamber and a gas operation unit 14 are provided. The gas operation unit 14 is formed by a button or a valve for performing a gas discharge or discharge stop operation from a mixed gas / oxygen gas supply device (not shown).

  Inside the side wall 1, a substantially cylindrical material lock 16 extending in the vertical direction is disposed. The material shaft 16 a of the material lock 16 is inserted into the opening 6 b of the third slab part 6 and the opening 5 b of the second slab part 5 on the lower side, and the upper side projects upward from the upper end part of the side wall 1. ing. In the vicinity of the upper end of the inner peripheral portion of the material shaft 16a, a double door first door 30 and a single door second door 31 are provided so as to be freely opened and closed. The first door 30 and the second door 31 are closed and the upper and lower sides are airtight. At the upper end portion of the material shaft 16a, a lock portion 16b having a mechanism for maintaining the atmospheric pressure in the maintenance chamber 7 and the pressurized working chamber 2 is provided.

  The lower end portion of the material shaft 16a forms an open end portion 16c. The open end portion 16 c faces the inside of the maintenance chamber 7.

  A caisson excavator 15 is provided below the open end 16c. The caisson excavator 15 is an excavator that excavates below, and has a pressure resistance capable of performing excavation work under high pressure. On the base side of the caisson excavator 15, wheels that run on the running rail 36 in the pressure working chamber 2 are attached. A rail that is arranged on the same line as the traveling rail 36 in the pneumatic working chamber 2 is attached to the recovery platform 37. The caisson excavator 15 also has various functions for enabling remote control (a receiving means for receiving a command signal by wireless wire, a demodulating means for demodulating the received signal, a control means for controlling a mechanical operation, etc.). I have.

  The base of the caisson excavator 15 is suspended and supported by the excavator collection device 15a. The collection frame 37 of the excavator collection device 15a is formed of a girder structure such as steel, and includes an engaging portion (not shown) that protrudes at both ends in the width direction and engages with the opening end portion 16c. In some cases, a hole (not shown) through which a bucket (not shown) for carrying out earth and sand can pass is formed through the central portion of the collection rack 37.

  The upper part 38 is joined to the recovery stand 37 by a joining tool (not shown) such as an electromagnetic force or a vacuum attracting force joint provided at the lower end.

  A man shaft 9 is disposed inside the side wall 1. The man shaft 9 is an elevator, and a substantially cylindrical hoistway 9 a extending in the vertical direction is fitted into the opening 6 a of the third slab portion 6 and protrudes upward from the upper end portion of the side wall 1. Inside the hoistway 9a, there are provided an elevator car 19a on which a person can ride and an elevator rail 19 which is installed in the vertical direction and guides the elevator car 19a. The elevator car 19a is suspended by a wire (not shown), and the end of the wire is joined to a winding means (not shown) that is rotationally driven by a motor (not shown).

  A ground side doorway 18 is formed in the vicinity of the upper end of the hoistway 9a, and the ground side doorway 18 is provided with a ground side doorway 18a that can be opened and closed. In the vicinity of the lower end portion of the hoistway 9a, a hoisting chamber side entrance 13 is opened and located inside the hoisting chamber 8, and the hoisting chamber side entrance 13 is provided with a hoisting chamber side entrance door 13a that can be opened and closed. . In the closed state, the elevator chamber side door 13a seals the interior of the hoistway 9a and the interior of the elevator chamber 8 in an airtight state.

  A control room 25 is provided outside (on the ground) of the caisson housing 1a, and a control means 26 is provided inside the control room 25. The control means 26 includes storage means such as a CPU (Central Processing Unit) and various semiconductor memories, and controls the pressure inside the pneumatic working chamber 2 and excavation work of the caisson excavator 15 (excavation of earth and sand and inside the pneumatic working chamber 2). Movement) and the opening and closing of the doors 11b and 11b and the door 12a are controlled by remote operation.

  The construction work of the pneumatic caisson 1A of the first embodiment will be described.

  First, reinforced concrete is formed in a covered cylindrical shape, the blade edge 3 and the first slab portion 4 are constructed, and the pressurized working chamber 2 is formed inside. The maintenance hatch portion 11 is fitted into the opening portion 11 a formed in the first slab portion 4. A traveling rail 36 is installed below the first slab portion 4.

  A material lock 16 is provided above the first slab portion 4. A side wall 1 made of reinforced concrete and a second slab part 5 are constructed above the first slab part 4, and a maintenance chamber 7 is formed inside. The man hatch part 12 is fitted into the opening part 5 a provided in the second slab part 5.

  A man shaft 9 is provided above the second slab portion 5. A side wall 1 made of reinforced concrete and a third slab part 6 are constructed above the second slab part 5, and a lifting chamber 8 is formed inside. The side wall 1 extends further upward as excavation progresses.

  Various members and materials are carried into the maintenance chamber 7 from above the material lock 16, and an excavator recovery device 15a is mounted on the open end 16c. A caisson excavator is mounted on the recovery platform 37 of the excavator recovery device 15a. 15 is installed. The elevator chamber 8 is provided with the terminal gas operation unit 14, the control chamber 25 is provided on the ground, and the control means 26 is installed.

  Excavation work by the pneumatic caisson 1A of the first embodiment will be described.

  When performing excavation work, the worker performs an operation by remote operation from the control unit 26 of the control room 25. The door 12a of the man hatch part 12, the first door 30 and the second door 31 of the material lock 16 are closed, the doors 11b and 11b of the maintenance hatch part 11 are opened, and the atmospheric pressure inside the maintenance chamber 7 and the pressurized working chamber 2 Is higher than atmospheric pressure.

  When the atmospheric pressure in the maintenance chamber 7 and the pressure working chamber 2 becomes substantially the same as the pressure in the lower portion of the opening surface 3a (the pressure at which the sand or the like below the opening surface 3a presses the pressure working chamber 2), the excavator recovery device The caisson excavator 15 is lowered from the maintenance chamber 7 to the pressurized working chamber 2 by driving 15a. The caisson excavator 15 moves in the pressure working chamber 2 by the guide of the traveling rail 36, and excavates the soil and the like below the opening surface 3a. When carrying out excavated soil to the ground, the first door 30 and the second door 31 of the material lock 16 are opened, and a bucket for carrying earth and sand (not shown) connected to a wire rope or the like from the upper part of the material shaft 16a. The pressure is lowered to the pressurized working chamber 2 through the open end 16c and the maintenance hatch 11. A bucket (not shown) is loaded with excavated soil by the operation of the caisson excavator 15, and after loading, is pulled up from the material shaft 16a by a wire rope or the like (at this time, the pressure in the pressurized working chamber 2 and the maintenance chamber 7 is Maintain higher pressure than atmospheric pressure).

  In the first embodiment, a description will be given of an operation when the maintenance operation of the caisson excavator 15 is performed in the maintenance chamber 7.

  When maintenance of the caisson excavator 15 is performed after the excavation work is completed, the excavator collection device 15a is driven to lift the caisson excavator 15 from the pressurized working chamber 2 to the maintenance chamber 7. The doors 11b and 11b of the maintenance hatch 11 are closed, and the atmospheric pressure in the maintenance chamber 7 is lowered to atmospheric pressure while maintaining the atmospheric pressure in the pressurized working chamber 2 higher than atmospheric pressure.

  After the air pressure in the maintenance chamber 7 is lowered, an operator enters the elevator car 19a from the ground side entrance 18 of the man shaft 9 and descends, and enters the elevator chamber 8 through the elevator chamber side entrance 13. The worker opens the door 12 a of the man hatch part 12, uses the ladder 10 to descend into the maintenance room 7 and performs maintenance work on the caisson excavator 15. Tools and parts necessary for maintenance are supplied by a worker on the ground down to the maintenance room 7 from the material shaft 16a.

  In the first embodiment, a description will be given of an operation in the case where the maintenance operation of the caisson excavator 15 is performed in the pressurized working chamber 2.

  When the caisson excavator 15 cannot be pulled up to the maintenance chamber 7 due to a failure of the excavator collecting device 15a, the work is lowered by the man shaft 9 while the doors 11b and 11b of the maintenance hatch 11 are left open. A member enters the elevator room 8. The operator closes the elevator chamber side entrance door 13a of the elevator chamber side entrance 13 and then operates the gas operation unit 14 so that the air pressure in the elevator chamber 8 becomes the same as that in the pressurized working chamber 2 and the maintenance chamber 7. Adjust to. After the pressure adjustment is completed, the worker opens the door 12a of the man hatch 12 and descends to the maintenance chamber 7, and further descends from the maintenance hatch 11 to the pressurized working chamber 2 to excavate the caisson in the pressurized working chamber 2. Maintenance of the machine 15 is performed. Also in this case, tools and parts necessary for maintenance are supplied by being lowered from the material shaft 16a. In the case of a large depth, the operator operates the gas operation unit 14 at the end in the lifting / lowering chamber 8, attaches a gas mask connected to the gas hose to the face, and enters the working chamber 2 while breathing gas.

  As described above, in the first embodiment, the up-and-down movement in which the maintenance chamber 7 capable of accommodating the caisson excavator 15 and the entrance and exit of the man shaft 9 are provided above the pressurized air working chamber 2 where the caisson excavator 15 performs excavation work. By arranging the chambers 8 side by side in the vertical direction, while maintaining the hoisting chamber side entrance 13 and the elevating chamber 8 which are the entrance to the hoisting chamber 8 side of the man shaft 9 and the maintenance place of the caisson excavator 15 A pneumatic caisson 1A having a small bottom area can be formed. In a narrow excavation area, a pneumatic caisson method can be realized in which the caisson excavator 15 is sufficiently repaired by an operator under atmospheric pressure.

  In the first embodiment, the first slab part 4, the second slab part 5, and the third slab part 6 are provided in triplicate, and the ceiling wall of the pressurized working chamber 2 is maintained by the first slab part 4. By forming the ceiling wall of the chamber 7 at the second slab portion 5 and the ceiling wall of the lifting / lowering chamber 8 at the third slab portion 6, the pressure working chamber 2, the maintenance chamber 7 and the lifting / lowering chamber 8 are mutually connected. The pressure working chamber 2, the maintenance chamber 7, and the lifting / lowering chamber 8 can be brought into different atmospheric pressure states depending on the purpose, while being arranged in the vertical direction while being separated from each other in a highly airtight state.

In the first embodiment, the first slab part 4, the second slab part 5, and the third slab part 6 are all made of reinforced concrete manufactured by the PC method, thereby constructing the slab part. The first slab part 4, the second slab part 5, and the third slab part 6 can be constructed with a solid reinforced concrete with a short construction period and at a reduced cost.

  In the first embodiment, a gas operation unit 14 at a terminal for operating a mixed gas / oxygen gas supply device (not shown) is provided inside the lift chamber 8, and the lift chamber 8 has a function as an atmospheric pressure adjustment chamber and is mixed. By combining the supply function of gas and oxygen gas, the pneumatic caisson 1A with a small bottom area can keep the air pressure in the pressurized working chamber 2 and the maintenance chamber 7 properly, and in the event of an emergency Can breathe mixed gas and oxygen gas.

In the first embodiment, the pressure chamber 2, the maintenance chamber 7, and the lift chamber 8 are arranged close to each other by providing the lift chamber 8 having a function as an atmospheric pressure adjustment chamber above the maintenance chamber 7. Recovery and maintenance work of the excavator 15 and adjustment of the atmospheric pressure can be easily performed. Further, the pressure working chamber 2, the maintenance chamber 7, and the lifting / lowering chamber 8 are arranged in the vertical direction in order from the bottom, and the doors 11b and 11b for sealing the pressure working chamber 2 and the maintenance chamber 7 in an airtight state are provided. The doors 11b and 11b are opened, the excavation work is performed with the pressure working chamber 2 and the maintenance chamber 7 at a high pressure, and the doors 11b and 11b are closed so that the pressure in the maintenance chamber 7 is the same as the atmospheric pressure. Maintenance of the caisson excavator 15 can be performed under atmospheric pressure. Furthermore, by providing the raising / lowering hatch part 34, there exists an effect that a worker can easily enter and exit the pressurized working chamber 2.

Oite to the first embodiment, although man shaft 9 has an automatic elevator having an elevator car 19a, without being limited thereto, it is also possible to form the stairs or the like.

Oite to the first embodiment has a configuration which has both a pressure adjustment function to the lifting chamber 8 is not limited to this, the partition wall is erected between the second slab portion and the third slab portion It is also possible to set one side as a lift chamber and the other as a pressure adjustment chamber.

Oite to the first embodiment, in the lifting chamber side entrance 13, but the lifting chamber side entrance door 13a is configured to seal the interior of the elevator chamber 8 and the interior of the hoistway 9a airtight, in such a configuration Instead, in the ground side entrance 8, the ground side entrance door 18 a may be configured to hermetically seal the hoistway 9 a and the outside.

Oite to the first embodiment, the first slab portion 4, the second slab portion 5, the third slab section 6 has been made of reinforced concrete produced by PC method, instead of such a configuration, the first slab portion 4 , at least one of the second slab part 5 and the third slab part 6 may be formed of steel frame concrete, or the first slab part 4 , the second slab part 5 , and the third slab part 6 . At least one of them may be made of reinforced concrete integrally formed with the side wall 1. Further, for example, the first slab portion 4 is made of precast reinforced concrete, the second slab portion 5 is the steel frame concrete, third slab portion 6 is made of steel, as in the first slab portion 4, the second slab portion 5, You may form each of the 3rd slab part 6 with a different material.

The first embodiment is intended to illustrate the present invention, the present invention is not meant to be limited only to the above embodiments.

It is front sectional drawing of the pneumatic caisson in Embodiment 1 of this invention. It is front sectional drawing of the pneumatic caisson of a prior art example.

Explanation of symbols

1 A · ·· Pneumatic caisson 2 ... gas working chamber 4 ... the first slab part
5, ... the second slab part
6 · · · the third slab section 7 ... maintenance chamber 8 ... lifting chamber 9 ... Man shaft (lifting part)
15 ... Caisson excavator
16 ... Material lock

Claims (1)

Caisson excavator,
A pressure working chamber having a working space for the caisson excavator inside;
A material shaft capable of carrying out the excavated material excavated by the caisson excavator and carrying in / out the members and materials of the caisson excavator;
A maintenance room capable of accommodating the caisson excavator;
Elevating part with elevating part entrance / exit where personnel can go up and down and keep airtight,
An elevating chamber provided with the elevating part inside,
The maintenance chamber and the lift chamber are arranged in the vertical direction on the upper side of the pressure working chamber ,
A first slab part that forms the ceiling wall of the pneumatic working chamber, a second slab part that forms the ceiling wall of the maintenance room, and a third slab part that forms the ceiling wall of the lift room are tripled in the vertical direction. Attached to the
A ladder for raising and lowering personnel is provided in the maintenance room so as to reach the lifting / lowering room, the material shaft penetrates the lifting / lowering room and the third slab part, and the man shaft is vertically penetrated to the third slab part. The pneumatic caisson is provided in the first slab portion so as to vertically penetrate an opening for passing a person .

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