JP4129707B2 - Installation of the bottom door of the case - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, since the compressed air in the shaft must be exhausted to the atmospheric pressure while keeping the pressure in the working chamber constant at the time of fitting (shaft addition), the shaft connection hole of the caisson is formed in the ceiling of the working chamber. The present invention relates to a method for mounting a bottom door that is closed with a slab.
[0002]
[Prior art]
As is well known, in the caisson work, as the subsidence progresses, locks and shafts are added as fitting equipment.
[0003]
When the shaft is extended during pressure work, the work chamber (box) in the caisson is not vented but only the inside of the shaft is vented to perform the transfer at atmospheric pressure. The connection hole is hermetically sealed with a bottom door, and the work chamber and the shaft are shut off to cut off the air only in the shaft.
[0004]
As for the method of attaching the bottom door, as shown in FIG. 1A, the conventional method is to suspend the bottom door 7 in the work room 3 with the crawler crane 8 so that one worker enters the work room. Installation work is performed by signal cues by the operator of the crawler crane 8 and communication means such as a telephone, a buzzer, a whistle, and a radio.
[0005]
That is, after the bottom door 7 is lifted by the crawler crane 8 to the ceiling slab of the working chamber 3 as shown in FIG. 1B, the special shaft 4 or the cascade is connected as shown in FIG. An operation of fixing with a lever block (registered trademark) 9 suspended from the shaft 5 is performed.
[0006]
This attachment work is not only dangerous but also has poor workability because the operator of the crawler crane 8 lifts the bottom door 7 in accordance with the instructions of the workers in the work room with poor scaffolding.
[0007]
In addition, the conventional bottom door closing operation required 120 minutes of work time by five skilled workers (crawler crane operator, material lock door opening / closing staff, two rigging workers, and caisson work room workers).
[0008]
[Problems to be solved by the invention]
Therefore, the present invention seeks to provide a method by which two workers in the caisson work chamber and the shaft connection hole can safely perform the work of attaching the bottom door of the caisson in a quarter of the conventional time. Is.
[0009]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention according to claim 1 is provided with an operation chain insertion hole for communicating the shaft connection hole and the working chamber in the case, and the operation of the insertion hole is performed. A mecha lid that seals and closes the chamber side is detachably provided, and the chain block is suspended in a special shaft or cascade shaft that is connected to the shaft connection hole, and the operation chain of the chain block is inserted into the insertion hole to end. After hanging the part in the working chamber and operating this operation chain to lift the bottom door until it presses against the ceiling slab in the working chamber, put the thing hanging down in the working chamber of the operation chain into the insertion hole, In this case, the bottom door mounting method of the caisson is characterized in that the insertion hole on the working chamber side is sealed.
[0010]
The invention according to claim 2 is provided with an electric wire of a switch circuit in which both ends are arranged in the shaft connection hole of the caisson and the working chamber, and an outlet or an electric wire terminal is connected to an end portion of the electric wire on the shaft connection hole side. A switch is connected to the room side, and a hoist winch is hung in a special shaft or cascade shaft connected to the shaft connection hole, and its power cord is connected to the outlet or electric wire terminal, and the switch is operated. The bottom door is attached to the ceiling slab of the work room until the bottom door is lifted up.
[0011]
[Action]
According to the present invention, in the case of a pneumatic caisson method provided with a material shaft and a man shaft, the fixing operation of the bottom door is safer in a much shorter time than before by two workers in the caisson work chamber and the shuttle connection hole. Can be done.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 shows an embodiment corresponding to the invention described in claim 1 of the present invention. Reference numeral 10 denotes an insertion hole 12 for accommodating an operation chain 11a communicating with the shaft connection hole 2 of the case 1 and the work chamber 3. FIG. An embedded steel pipe having a diameter of 100 mm to be formed, 11 is a 1t suspension chain block suspended from a cascade shaft 5 connected to a special shaft 4, and an operation chain 11 a is inserted into the embedded steel pipe 10 and an end portion thereof is a working chamber 3. The bottom door 7 is lifted by operating the operation chain 11a.
[0013]
When the cascade shaft 5 is connected as the case 1 sinks, the bottom door 7 is attached by using a ladder (not shown) provided in the ladder and the shaft connection hole 2 from the work chamber 3 first. The chain block 11 is suspended from the cascade shaft 5 and the end of the operation chain 11a is dropped into the embedded steel pipe 10 from the shaft connection hole 2 side.
[0014]
Next, the hook 11c of the lifting rope 11b of the chain block 11 is connected to the bottom door 7 via the wire 13 with the suspension base, the operation chain 11a is operated, and the bottom door 7 is lifted until it comes into close contact with the ceiling slab. Is pushed into the embedded steel pipe 10, and the mecha lid 14 is screwed into the end of the embedded steel pipe 10 and sealed as shown in FIG.
[0015]
As a result of this work, the working chamber 3 is sealed and ventilated. Next, when the manlock (not shown) provided on the cascade shaft 5 is opened, the inside of the cascade shaft becomes atmospheric pressure, and the connection of the cascade shaft is under atmospheric pressure. Will be able to do it.
[0016]
In the embodiment described above, the structure is such that the attachment of the meckle lid 14 is screwed into the end of the embedded steel tube 10, but the mecha lid 14 is attached to the end of the embedded steel tube 10 with a bolt 15 as shown in FIG. It is good also as a structure fixed to the provided flange 10a.
[0017]
FIG. 5 shows an embodiment corresponding to the second aspect of the present invention, which is an electric bottom door mounting device.
[0018]
In the figure, 16 is an embedded electric wire, one end is connected to an outlet 17 provided on the shaft connection hole 2 side, and the other end is connected to a switch 18 attached to the wall surface of the work chamber 3.
[0019]
Reference numeral 19 denotes a 0.75-t hoist winch suspended from the special shaft 4. The power cord 19 a is connected to the outlet 17. Since the buried electric wire is connected to the lighting in the working room or the power source for the crane excavator, when the switch 18 is turned on, the hoist winch 19 operates to lift and fix the bottom door 7 to the ceiling slab.
[0020]
The fixing operation of the bottom door 7 to the ceiling slab may be performed in the same procedure as in the manual operation, and the operation is self-explanatory and will not be described.
[0021]
【The invention's effect】
As can be seen from the above description, according to the present invention, two workers in the caisson working chamber and the shaft connection hole can perform the mounting (sealing) operation of the bottom door 7, so that the conventional crawler crane can be used. As in the case of using it, the work can be performed safely in a shorter time than before without paying attention to the contact instruction of the worker outside the caisson.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a conventional bottom door mounting method. FIG. 2 is a schematic view when the bottom door is lifted in the first embodiment of the invention. FIG. 3 is a schematic view when the bottom door is closed in the first embodiment of the invention. FIG. 4 is a cross-sectional view of another embodiment of a meka lid. FIG. 5 is a schematic view of a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Case 2 Shaft connection hole 3 Work chamber 4 Special shaft 5 Cascade shaft 6 Material lock 7 Bottom door 8 Crawler crane 9 Lever block (trademark)
10 Embedded steel pipe 11 Chain block 12 Insertion hole 13 Wire with suspension base
14 Mekura lid 15 Bolt 16 Buried wire 17 Outlet 18 Switch 19 Hoist winch

Claims (2)

A special shaft that has an operation chain insertion hole that connects the shaft connection hole and the work chamber in the case, a removable lid that hermetically closes the work chamber side of the insertion hole, and is connected to the shaft connection hole. Alternatively, the chain block is suspended in the cascade shaft, the operation chain of the chain block is inserted into the insertion hole, the end is suspended in the work chamber, and the operation door is operated to press the bottom door against the ceiling slab of the work chamber. A method of attaching the bottom door of the caisson, wherein the operation chain is suspended in the work chamber, and the operation hole is inserted into the insertion hole, and the insertion hole on the work chamber side is sealed with a cover lid.   A switch circuit wire with both ends arranged in the shaft connection hole of the caisson and the work chamber is provided, and an outlet or a wire terminal is connected to the end of the shaft connection hole side of the wire, and a switch is connected to the work chamber side. At the same time, a hoist winch is suspended in a special shaft or a continuation shaft connected to the shaft connection hole, its power cord is connected to the conset or electric wire terminal, and the switch is operated to connect the bottom door to the work room. A method of attaching a bottom door of a caisson, characterized by lifting up to a pressure contact with a ceiling slab.

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