JP2539615B2 - New Matte Case - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pneumatic caisson for use in foundations of concrete structures buried in the ground or the like for excavating work using compressed air.

(Prior Art and Problems Thereof) Conventionally, this type of pneumatic caisson is constructed as shown in FIG. That is, in the figure, 1 'is a caisson, S is a work room for excavation work and the like, 16 is an air lock for adjusting the air pressure, and the air lock 16 is an upper hatch.
16g and a lower hatch 16g '. Reference numeral 17 denotes a shaft for communicating the airlock 16 with the work room S, reference numeral 18 denotes a sediment bucket for transporting excavated sediment, reference numeral 19 denotes a crane,
1 'is a supply pipe and an exhaust pipe. G is the ground,
W is a load water for increasing the load of the caisson 1 '.

Therefore, in the pneumatic caisson having the above configuration, first, the working chamber S, the inside of the shaft 17 and the air lock 16 are
After pressurizing the inside, excavation of the ground G is started, and the excavated earth and sand generated thereby is loaded into the earth and sand bucket 18 and the shaft 17 is excavated.
Into the airlock 16. Then the lower hatch 16
After closing g ′ and depressurizing the inside of the air lock 16 through the exhaust pipe 11 ′, open the upper hatch 16g and
Take out 8 and carry out the earth and sand. The earth and sand bucket 18 is put into the airlock 16 again, the upper hatch 16g is closed to pressurize the inside of the airlock 16, and then the earth and sand bucket 18 is lowered into the working chamber S. And these things are repeated to carry out the earth and sand.

However, the problem here is that there is a pressure difference between the space compressed by compressed air and the atmospheric pressure. Since it is necessary to adjust the atmospheric pressure, it takes time to avoid it, and its operation is difficult, so it is not possible to carry out a large amount of earth and sand continuously, and the greater the depth, the more earth and sand It takes a long time for the bucket to make a round trip between the ground and the work room, and thus the efficiency of unloading sediment is poor.

(Means for Solving Problems) The present invention has been proposed in view of the above points, and an object thereof is to provide a pneumatic caisson capable of efficiently carrying out sediment even in a place having a pressure difference. To provide.

That is, in the present invention, the work chamber S is provided above the work chamber S.
A pressure chamber A communicating with the pressure chamber A is provided, another pressure chamber B serving as a sediment chamber is provided near the pressure chamber A, and the excavated soil g in the working chamber 5 is put into the pressure chamber A. A screw which has a hopper 7 and has a sand hopper 7 and a gate 7g for preventing leakage of air which can be opened and closed between the pressure chambers A and B, and which conveys the excavated soil g to another pressure chamber B side. The above object is achieved by providing the earth and sand transporting device D including a conveyor.

(Function) A pressure-adjusted place is provided with a sand conveyer such as a screw conveyor that communicates with a place where pressure can be adjusted, and an openable / closable gate for preventing air leaks is provided in the conveyer, and the atmospheric pressure is applied from the place where the pressure is generated. A large amount of earth and sand can be carried out downwards and continuously.

(Embodiment) FIGS. 1 and 2 show an embodiment of a pneumatic caisson according to the present invention, in which 1 is a caisson and 2
A blade edge 2a is formed in the lower portion of the side wall of the blade. Further, 3 is a partition wall which is provided inside the side wall 2 and partitions and forms several chambers, and 4 is a first slab which is a lower portion inside the caisson and which is provided between the side walls, and is used for excavation work or the like. The chamber S is partitioned and formed.

Reference numeral 5 is a second slab provided above the first slab 4 and between the partition walls 3 that form a chamber in the central portion. The first compressed air chamber A is provided between the second slab 5 and the first slab 4. Are formed. Reference numeral 6 denotes a third slab provided for partitioning and forming the second pressure chamber B near the first pressure chamber A.
If the inside of the second pressure chamber B is made smaller than the first pressure chamber A by providing the slab 6 at a position lower than that of the second slab 5, the workability of supplying and exhausting the second pressure chamber B is improved. Is preferable and preferable.

Then, the first slab 4 is provided with a sediment carrying port 4h capable of communicating the working chamber S with the first pressure chamber A provided above the working chamber S, and the first pressure chamber A side is provided via the sediment carrying port 4h. An earth and sand carrier such as a vertically movable grab bucket 9 is configured so that the excavated earth and sand g in the work chamber S can be transferred to the outside. If necessary, use a jack at this sediment transport port 4h.
An openable and closable gate 13g operated by 13j may be provided.

The glove bucket 9 is movable via a rail 10 provided on the ceiling surface of the second slab 5, and the earth and sand in the glove bucket 9 is changed from the first compressed air chamber A to the earth and sand reservoir chamber. It is put into the earth and sand transport device D provided over the pressure chamber B and is discharged to the second pressure chamber B. In this example, the earth and sand conveying device D has a gate 7g for preventing air leakage which can be opened and closed by a jack 7j at the bottom, and earth and sand hopper 7 into which earth and sand are thrown, and the earth and sand hopper 7 and the gate 7g portion. A rotatable screw provided inside the casing 8a, which is connected to the casing 8a and has a substantially cylindrical cross-section, which is hermetically penetrated through the partition wall 3 partitioning the first and second pressure chambers A and B.
8b is provided with earth and sand conveying means such as a screw conveyor 8 for conveying earth and sand from the first pressure chamber A to the second pressure chamber B side.

In this case, the gate 7g provided on the earth and sand hopper 7 side is opened and closed to connect and disconnect the first compressed air chamber A and the second compressed air chamber B.
Leakage in the pressure chamber A is prevented. The gate 7g may be provided near the discharge port 8c of the screw conveyor 8. Further, although only one device is shown in the figure, it is possible to provide an appropriate number.

Thus, the third slab 6 forming the second pressure chamber B is also provided with an open / closed earth / sand loading port 6h via the gate 6g operated by the jack 6j, and the earth / sand loading of the screw conveyor 8 is performed via this loading / unloading port 6h. The earth and sand carried into the second pressure chamber B from the carry-out port 8c is carried out upward by the grab bucket 12.

The second and third slabs 5 and 6 are respectively provided with an air supply pipe 11 for compressed air and an exhaust pipe 11 'for exhaust. A shaft 12 is connected to the second slab 5, and the shaft 12
An air lock (not shown) is provided on the upper part of the device if necessary.

 Next, the earth and sand carrying method of the present invention will be described.

As shown in FIG. 1, the earth and sand g excavated in the working room S is thrown into the earth and sand hopper 7 by the grab bucket 9 through the earth and sand carry-out port 4h. At this time, the gate 7g is closed,
The compressed air in the working chamber S and the first compressed air chamber A does not leak through the screw conveyor 8 or the like.

Next, as shown in FIG. 2, the gate 6g of the second pressure chamber B is closed and the inside is pressurized to the same pressure as the first pressure chamber A. After that, the gate 7g is opened, and the earth and sand in the earth and sand hopper 7 is conveyed to the second pressure chamber B by the screw conveyor 8. Alternatively, if the inside of the second pressure chamber B is pressurized in advance, even if the gate 7g of the earth and sand hopper 7 is not closed, the inside pressures of the first pressure chamber A, the second pressure chamber B and the working chamber S are the same, so the pressure inside them is the same. It is possible to carry out the earth and sand from the working chamber S to the second pressure chamber B without changing the temperature.

Next, as shown in FIG. 1, after closing the gate 7g of the earth and sand hopper 7, the gate 6g of the second pressure chamber B is opened, and the earth and sand carry-out port 6h
Through the clamshell 12 etc., you can bring earth and sand to the ground.

FIG. 3 is an application example of the present invention. In addition to providing a conveying means such as a screw conveyor 8 from the first pressure chamber A to the second pressure chamber B in order to efficiently carry out the earth and sand to the ground side, Looking from the first pressure chamber A to the second pressure chamber B, for example, an adjacent chamber in a direction orthogonal to this is defined as a third pressure chamber C, and the screw conveyor 8 is also provided in the third pressure chamber C, for example. I am configuring. Other configurations are almost the same as those in FIGS. 1 and 2.

Further, in this example, the sediment carrying-out work to the ground on the second and third pressure chambers B and C side is alternately performed so that the sediment can be carried out to the ground side more efficiently.

That is, the earth and sand carried out from the working room S shown in FIG. 1 and stored in the pair of earth and sand hoppers 7, 7 are stored in two second,
Of the third pressure chambers B and C, while transferring one of the gates 6g to the closed pressure chamber, open the gate 6g of the other pressure chamber,
Since the earth and sand stored in the clam shell 12 etc. can be carried out to the ground, it is possible to carry out the earth and sand continuously.

In addition, when carrying out the earth and sand to the ground side, the earth and sand in the second pressure chamber B and the third pressure air chamber C can be stored to a certain extent and can be carried out to the ground even after the completion of the subsidence excavation. Even if it is deep, the process is not restricted when it is taken out to the ground.

(Effect of the invention) As described above, according to the present invention, a pressure chamber that can communicate with the work chamber is provided in the upper part of the work chamber, and another pressure chamber that serves as a sediment chamber is provided near the pressure chamber. It has a sand hopper between the pressure chambers and a gate for air leak prevention that can be opened and closed freely, and is equipped with a sediment transfer device consisting of a screw conveyor that conveys the sediment to other pressure chambers. By opening and closing the air leakage prevention gate as appropriate, the sediment in the working chamber can be transferred from the pressure chamber provided above it to the sediment chamber almost continuously, in large quantities, and in a short time. It is also possible to carry out a large amount of earth and sand at one time by increasing the capacity of the clam shell etc. without taking the trouble of pressure control when carrying out the earth and sand from other pressure chambers to the ground. You can

In addition, since the earth and sand reservoir is provided so that the earth and sand can be accumulated, there is an effect that the excavation work and the carry-out work can be performed separately.

[Brief description of drawings]

1 and 2 are explanatory views of an embodiment according to the present invention,
FIG. 3 is a partial plan view of an application example of the embodiment according to the present invention, and FIG. 4 is an explanatory view of a conventional example. S: working chamber, A: first pressure chamber, B: second pressure chamber,
D: Sediment carrier

Claims (1)

(57) [Claims] 1. A pressure chamber (A) communicating with the work chamber (S) is provided in the upper part of the work chamber (S), and another pressure chamber (B) serving as a sediment chamber is provided near the pressure chamber (A). And a earth and sand hopper (7) into which the excavated earth and sand (g) in the working chamber (5) is placed in the pressure chamber (A), and between the pressure chambers (A) and (B). In addition, the earth and sand hopper (7) and a gate (7 g) for preventing air leakage that can be opened and closed, and a earth and sand conveying device including a screw conveyor that conveys the excavated earth and sand (g) to another pressure chamber (B) side. A pneumatic caisson characterized by having (D).