JP7703282B2 - Open caisson construction system - Google Patents

Description

The present invention relates to an open caisson construction system used to construct shafts such as departure shafts and arrival shafts.

Conventionally, a method for excavating this type of open caisson is known as the open caisson method, in which the caisson is submerged while the soil inside is excavated using an underwater excavator.

A representative construction system for this conventional open caisson method is disclosed in, for example, Patent Document 1.
This open caisson construction system is
(a) an excavator that can move freely along a traveling rail laid on the lower inner wall of the caisson body in order to excavate soil and sand inside the caisson body;
(b) a self-propelled trackless support machine provided outside the caisson body to support the driving of the excavator;
(c) a lifting device that raises and lowers the excavator along the inner wall of the caisson body, and (d) a self-propelled excavation and lifting device that is provided separately from the support machine and excavates and lifts soil from required areas inside the caisson body and lifts up the soil excavated by the excavator.

Japanese Patent Application Publication No. 11-229394

The open caisson construction system disclosed in the above-mentioned Patent Document 1 uses a self-propelled, trackless support machine to support the driving of the excavator, and a self-propelled excavation and lifting device to excavate and lift soil. This has the advantage of being versatile and has few restrictions on the construction site. However, it has the problem that it requires expertise to operate the support machine and excavation and lifting device, and the construction environment around the caisson body tends to become cluttered.

In view of the problems with the open caisson construction system disclosed in the above-mentioned Patent Document 1, the present invention aims to provide an open caisson construction system that has fewer restrictions on the construction site, is versatile, is easy to automate construction, and can keep the construction environment around the caisson body neat and tidy.

In order to achieve the above object, the open caisson construction system of the present invention is characterized in that a guide rail is laid in a ring shape on the inner wall surface of the caisson body, an excavator is arranged to be movable along the guide rail, and the excavator excavates soil and sand inside the caisson body, a club trolley type overhead crane is installed in the space above the caisson body, a turntable is provided on the club that travels across the crane girder of the club trolley type overhead crane, and a lifting support mechanism for the excavator and a power supply mechanism that supplies power to the excavator are arranged on the turntable.

In this case, a control mechanism is provided that controls the lateral travel of the club trolley overhead crane and the rotation of the turntable, and the control mechanism can be used to control the angular relationship in a plan view between the lifting support mechanism and power supply mechanism arranged on the turntable of the club and the excavator supported on the club via the lifting support mechanism so that it remains constant.

In addition, two crane girders can be placed on the above-mentioned crab trolley type overhead crane, with a turntable provided on the crab that travels across one of the crane girders and a clamshell bucket provided on the crab that travels across the other crane girder.

The space above the caisson body can also be covered with a building.

According to the open caisson construction system of the present invention, a club trolley type overhead crane is installed in the space above the caisson body, a turntable is provided on the club that travels across the crane girder of the club trolley type overhead crane, and a lifting support mechanism for the excavator and a power supply mechanism that supplies power to the excavator are arranged on the turntable. This reduces restrictions on the construction site, is versatile, and makes it easy to automate construction, resulting in a neat and tidy construction environment at the construction site around the caisson body.

In addition, a control mechanism is provided to control the lateral travel of the club trolley overhead crane and the rotation of the turntable, and the control mechanism controls the angular relationship in a plan view between the lifting support mechanism and power supply mechanism arranged on the club turntable and the excavator supported on the club via the lifting support mechanism so that it remains constant, making it possible to automate construction.

In addition, by placing two crane girders on a club trolley type overhead crane and providing a turntable on the club that travels across one of the crane girders and a clamshell bucket on the club that travels across the other crane girder, it is possible to use a common club trolley type overhead crane to assist in driving the excavator and to excavate and lift soil.

In addition, by covering the space above the caisson body with a building, noise generated at the construction site can be prevented from diffusing to the surrounding area.

FIG. 2 is an explanatory diagram showing one embodiment of the open caisson construction system of the present invention. This is an explanatory diagram of the operation of the control mechanism that controls the lateral movement of the club trolley type overhead crane and the rotation of the turntable of the open caisson construction system.

Below, an embodiment of the open caisson construction system of the present invention will be explained with reference to the drawings.

1 and 2 show one embodiment of the open caisson construction system of the present invention.
This open caisson construction system is used to construct shafts such as departure shafts and arrival shafts, and involves laying a ring-shaped guide rail 21 for the excavator on the inner wall surface of the caisson body 1, positioning an excavator (underwater excavator) 2 so that it can move along the guide rail 21, and using the excavator 2 to excavate soil and sand inside the caisson body 1.In this open caisson construction system, a club trolley type overhead crane 3 is installed in the space above the caisson body 1, a turntable 33 is provided on a club 32 that travels across the crane girder 31 of the club trolley type overhead crane 3, and a lifting support mechanism 34 for the excavator 2 and a power supply mechanism 35 that supplies power to the excavator 2 are arranged on the turntable 33.

Here, the excavator 2 can be equipped with a drive mechanism for moving along the guide rail 21, a drive mechanism for the excavation means, a position detection mechanism for the excavator 2 (e.g., a position sensor attached to the guide rail 21), etc., similar to the one disclosed in Patent Document 1.

In addition, the lifting support mechanism 34 is equipped with a wire reel, and the power supply mechanism 35 is equipped with a cable reel, and a hoisting winch 36 is used to wind up and lower the cable that sends wire, electricity (and, if necessary, pressure oil) and operating signals to the excavator 2.
Here, the wire reel of the lifting support mechanism 34 is arranged at a position on the turntable 33 that supports the excavator 2 at the center position of the turntable 33 by a wire suspended from the wire reel.

In addition, the space above the caisson body 1 is covered to a predetermined extent by a building 4, and the running rails 37 of the club trolley type ceiling crane 3 are laid on the beams 41 of the building 4.
By providing the building 4, noise generated at the construction site can be prevented from diffusing to the surrounding area, thereby eliminating noise problems particularly in urban areas.

In addition, in the crab trolley type ceiling crane 3, in addition to the crane girder 31 on which the crab 32 equipped with the turntable 33 moves, a second crane girder 38 is arranged, and a clamshell bucket 6 is provided on a crab 39 that moves across the crane girder 38.
This makes it possible to use a common crab trolley type overhead crane 3 to assist in driving the excavator 2 and to excavate and lift soil using the clamshell bucket 6.

A maintenance stand 22 for maintaining the excavator 2 that has been raised to the ground is installed on the ground inside the building 4 around the caisson body 1, and a control room 51 for controlling the pressing of the pressing equipment 5 of the caisson body 1 and a hydraulic unit 52 for supplying pressurized oil to the pressing equipment 5 are installed on the ground outside the building 4.

The excavator 2 placed on the maintenance stand 22 and maintained is connected to the lifting support mechanism 34 and power supply mechanism 35 of the crab 32 that travels across the crane girder 31 of the crab trolley type overhead crane 3.
In this state, the excavator 2 is lifted via the lifting support mechanism 34, the club trolley type ceiling crane is run horizontally, and the excavator 2 is suspended via the lifting support mechanism 34 at the reference position 21a where the guide rail 21 is cut out, and attached to the guide rail 21, so that it is positioned so that it can move along the guide rail 21, and the soil inside the caisson body 1 can be excavated.

Incidentally, this open caisson construction system is provided with a control mechanism that controls the lateral movement of the club trolley type ceiling crane 3 and the rotation of the turntable 33, and this control mechanism controls the angular relationship in a plan view between the lifting support mechanism 34 and power supply mechanism 35 arranged on the turntable 33 of the club 32 and the excavator 2 supported on the club 32 via the lifting support mechanism 34 so that it remains unchanged.
This makes it possible to automate construction work and also makes it possible to prevent twisting of the wire suspended from the wire reel of the lifting support mechanism 34 and the cable suspended from the cable reel of the power supply mechanism 35.

Specifically, the excavator 2, which has been placed on the maintenance stand 22 and maintained, is transported from the position shown in Figure 2 (a) to the reference position 21a shown in Figure 2 (b), and at this position, the excavator 2 is attached to the guide rails 21 so that it is positioned so that it can move along the guide rails 21.
As shown in FIG. 2(b) to FIG. 2(e), the excavator 2 moves 180 degrees along the guide rail 21.
While moving, excavation is performed around and below the inner surface of the caisson body 1.
At this time, the control mechanism that controls the lateral movement of the club trolley type overhead crane 3 and the rotation of the turntable 33 controls the rotation of the turntable 33 so that the reference line L of the turntable 33 always points toward the center O of the caisson body 1, based on the position information (position on the circumference of the caisson body 1) emitted by the position detection mechanism of the excavator 2 moving along the guide rail 21, in accordance with the positions of the crane girder 31 and club 32 of the club trolley type overhead crane 3 which move laterally in accordance with this, thereby ensuring that the angular relationship in a planar view between the lifting support mechanism 34 and power supply mechanism 35 arranged on the turntable 33 of the club 32 and the excavator 2 supported by the club 32 via the lifting support mechanism 34 remains unchanged.

When the excavation work in the range of 180° is completed, the excavator 2 returns to the reference position 21a and performs the same excavation work in the range of 180° in the opposite direction.
Here, it is also possible to perform excavation work continuously within a range of 360° from the reference position 21a.

According to this open caisson construction system, a club trolley type overhead crane 3 is installed in the space above the caisson body 1, a turntable 33 is provided on the club 32 that travels across the crane girder 31 of the club trolley type overhead crane 3, and a lifting support mechanism 34 for the excavator 2 and a power supply mechanism 35 that supplies power to the excavator 2 are arranged on the turntable 33. This reduces restrictions on the construction site, is versatile, and makes it easy to automate construction, resulting in a neat and tidy construction environment at the construction site around the caisson body 1.

The open caisson construction system of the present invention has been described above based on its embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the configuration can be changed as appropriate within the scope of the spirit of the invention.

The open caisson construction system of the present invention has the characteristics of having few constraints on the construction site, being versatile, being easy to automate construction, and being able to keep the construction environment around the caisson body neat and tidy, so it can be widely used to construct shafts such as departure shafts and arrival shafts.

1. Caisson body 2. Excavator (underwater excavator)
21 Guide rail 21a Reference position 22 Maintenance platform 3 Crab trolley type overhead crane 31 Crane girder 32 Crab 33 Turntable 34 Lifting support mechanism 35 Power supply mechanism 36 Hoisting winch 37 Traveling rail 38 Crane girder 39 Crab 4 Building 41 Beam 5 Pressing equipment 51 Control room 52 Hydraulic unit 6 Clamshell bucket L Reference line of turntable

Claims (4)

1. An open caisson construction system in which a guide rail is laid in a ring shape on the inner wall surface of a caisson body, an excavator is positioned so that it can move along the guide rail, and the excavator is used to excavate soil and sand inside the caisson body. A club trolley type overhead crane is installed so that a crane girder runs in the space above the caisson body, a turntable is provided on the club that runs laterally over the crane girder of the club trolley type overhead crane, and a lifting support mechanism for the excavator and a power supply mechanism for supplying power to the excavator are arranged on the turntable. A control mechanism is provided that controls the lateral travel of the club trolley type overhead crane and the rotation of the turntable to align the positions of the crane girder and club of the lateral-traveling club trolley type overhead crane based on position information on the circumference of the caisson body generated by the position detection mechanism of the excavator moving along the guide rail, and controls the angular relationship in a plan view between the lifting support mechanism and power supply mechanism arranged on the turntable of the club and the excavator supported by the club via the lifting support mechanism so that it remains constant . An open caisson construction system as described in claim 1, characterized in that a maintenance platform for maintaining the excavator raised to the ground is installed around the caisson body at a position connectable to the lifting support mechanism and the power supply mechanism . The open caisson construction system according to claim 1 or 2, characterized in that two crane girders are arranged on the crab trolley type overhead crane, a turntable is provided on the crab that travels across one of the crane girders, and a clamshell bucket is provided on the crab that travels across the other crane girder. The open caisson construction system described in claim 1, 2 or 3, characterized in that the space above the caisson body is covered with a building.

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