JP2001032675A - Shaft structure for starting shield machine, and shield machine starting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide shaft structure for starting a shield machine and a shield machine starting method dispensing with shaft cutting work and reducing shaft dimensions. SOLUTION: This shaft structure is provided with a start opening 4 opened in a side wall 2 of a shaft 1 to be the start base of a shield machine, and a part 6 of the shield machine detachably fitted to the start opening 4 so as to cover it. The shield machine is started from the shaft 1 by starting the shield machine covering the start opening 4 of the shaft side wall 2, so that demolishing work and cutting work of the shaft side wall 2 heretofore essential are entirely dispensed with. In addition, since a part 6a of the shield machine fitted to cover the start opening 4 is embedded in the plate thickness T of the side wall 2, the dimension D of the shaft 1 can be reduced by the embedded portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft structure for starting a shield machine and a method for starting a shield machine.

[0002]

2. Description of the Related Art FIG. 5 shows an outline of starting a shield machine from a shaft. As shown in the drawing, first, a shield machine a is carried into a shaft c by a crane b or the like, and is mounted on a gantry d. In the illustrated example, the excavator a completed by the crane b is carried into the shaft c. However, parts of the excavator a may be carried in predetermined blocks and assembled in the shaft c. Thereafter, a reaction force receiving member e with which the propulsion jack in the excavator a contacts is attached to the rear of the excavator a, and the ground f at a portion where the excavator a starts moving is ground-improved. Demolish g and start.

However, in this construction method, it is necessary to improve the ground by injecting a chemical into the ground f as a protective work, so that the construction period is prolonged and the problem of groundwater contamination occurs. In addition, since it is necessary for the worker to tear down the side wall g to obtain the starting port, the pit c is filled with garbage, which deteriorates the working environment and is not preferable in terms of safety. Accordingly, a method has been developed in which the side wall g in front of the excavator a is replaced with a special wall that can be excavated with a cutter bit, and the special wall is excavated with the cutter h to start the excavator a. .

[0004]

However, in the case of this construction method, it is necessary to attach a special bit capable of cutting a special wall to the cutter h, which increases the cost of the shield machine a. In addition, the space for attaching the normal bit to the cutter h is reduced due to the attachment of the special bit, which may lead to a decrease in the excavating ability.

On the other hand, the dimension D (inner diameter) of the shaft c needs to be designed in accordance with the total length L of the excavator a in order to accommodate the completed excavator a in the inside thereof. It is difficult. Reduction of the dimension D of the shaft c is not only low in cost of the shaft c itself, but also leads to reduction of the work site area on the ground.

SUMMARY OF THE INVENTION An object of the present invention created in consideration of the above circumstances is to provide a shaft structure for starting a shield excavator and a method of starting the shield excavator, which can eliminate the need for cutting the shaft and reduce the size of the shaft. To provide.

[0007]

According to a first aspect of the present invention, there is provided a shaft excavation structure for starting a shield excavator, the start excavation being formed on a side wall of a shaft serving as a start base of the shield excavator. And a part or the whole of a shield machine which is detachably attached to the starting port so as to cover the starting port.

In a second aspect of the present invention, there is provided a method for starting a shield machine, wherein a shaft with a part of the shield machine mounted on a starting port of a side wall is buried in the ground to cover the starting port.
The remaining portion of the shield machine is carried into the shaft and connected to the above part to complete the shield machine, and the shield machine is started from the starting port.

In a third aspect of the invention, there is provided a method for starting a shield excavator, wherein a shaft having a shield excavator attached to a start opening of a side wall is buried in the ground to cover the same. It is designed to be started from the starting port.

According to these inventions, starting of the shield excavator from the shaft is performed by starting the shield excavator covered by the start opening of the side wall of the shaft, and thus the shaft excavation which has been conventionally essential is performed. No cutting work is required.

Further, the shield excavator attached so as to cover the start port is partially embedded in the thickness of the side wall, so that the size of the shaft can be reduced by the embedded amount.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a horizontal sectional view of a shaft serving as a starting base of a shield machine, and FIG. 1B is a vertical sectional view of the shaft. As shown in the figure, a shaft 1 is composed of a cylindrical side wall 2 made of steel plate, reinforced concrete, or the like, and a disk-shaped bottom wall 3 provided to cover the bottom. Note that the side wall 2 is not limited to a cylindrical shape as shown in the figure, but may be a square tube shape. In this case, the bottom wall 3 is a square plate shape.

A starting port 4 is formed in the side wall 2 so as to communicate between the inside and the outside. A guide plate 5 formed in a ring shape from steel, stainless steel, resin, or the like is attached to the start port 4. A part of the shield machine is detachably attached to the starting port 4 so as to cover the starting port 4. In the present embodiment, a part of the above-mentioned part employs the front trunk part 6 of the center-bend type shield machine, but is not limited thereto, and may be a front part of a normal shield machine.

The front torso 6 has a front torso shield frame 7 formed in a tubular shape, a partition 8 provided therein to partition the face side and the inside of the pit, and is rotatably attached to the partition 8. And a screw conveyor base 10 attached to the partition wall 8. The front torso shield frame 7 is dimensioned to be slidably fitted to the guide plate 5 of the starting port 4. The cutter 9 is driven to rotate by a motor (not shown), and substantially excavates the ground 11.
have.

The screw conveyor base 10 is provided with an opening / closing shutter 12 capable of closing the conveying passage in a watertight manner. The opening / closing shutter 12 suppresses the spout of groundwater when the shutter is closed, and is opened and closed by a cylinder 13. 3 (b)
The screw conveyor extension 14 is connected as shown in FIG. Thereby, the screw conveyor 15 is completed.
The screw conveyor 15 conveys earth and sand excavated by the bit 11 and taken into the cutter chamber 16 into the shaft 1.

In the case of a muddy water shield, not a mud pressure shield as in the present embodiment, a mud feed pipe base and a mud discharge pipe base are provided on the partition wall 8 in place of the screw conveyor base 10, and these feed pipes are provided. By closing the on-off valves provided at the bases of the mud pipes and the drain pipes, it is possible to suppress the spurting of groundwater. The mud pipe extension and the mud pipe extension are connected to the mud pipe and mud pipe bases (at the stage shown in FIG. 3B), respectively.

As shown in FIGS. 1A and 1B, the front body 6
The part 6 a is embedded and accommodated in the thickness T of the shaft wall 2, and is detachably attached to the shaft wall 2 via the fixing bracket 17. The fixing bracket 17 is fixed to the side wall 2 and is formed in a cylindrical shape so as to surround the front body shield frame 7 at a predetermined distance from the front body shield frame 7.
And a detachable fitting 19 attached to the end of the base fitting 18 and attached to and detached from the front trunk shield frame 7.

The attachment / detachment 19 may be a disc with a hole formed in a flange shape, or may be composed of a plurality of rods spaced at predetermined intervals in the radial direction. Detachable bracket 1
9 and the front body shield frame 7 are fixed by welding, bolts and the like, and separated by welding and removing the bolts and the like. At the time of this separation, the detachable fitting 19
May be left attached to the base fitting 18, or the detachable fitting 19 may be detached from the base fitting 18 (see FIG. 3 (b)).

As shown in FIGS. 1 (a) and 1 (b),
On the inner peripheral surface, there are provided two rows of seal members 20 for sealing the space between the front body shield frame 7 and the front trunk shield frame 7 at predetermined intervals in the axial direction. The sealing members 20 in each row are configured by arranging a ring-shaped material such as rubber, resin, or a brush so as to abut the front body shield frame 7, and only seals the gap between the front body shield frame 7 and the body. FIG. 4
As shown in (c) and (d), when the shield machine starts, the space between the shield 21 and the segment 21 is also sealed.

That is, the sealing members 20 in each row are
In (c) and (d), the spring plate 22 is formed to have a predetermined length capable of contacting the segment 21 while maintaining a sufficient pressing force. The spring plate 22 presses the seal member 20 toward the segment 21 forward in the digging direction. And a holding plate 23 for preventing the seal member 20 from reversing rearward in the digging direction.
have. The spring plate 22 and the holding plate 23 are
The length of the seal member 20 need not be sufficient. 1 (a) and 1 (b), the space defined by the base bracket 18, the seal member 20, and the front body shield frame 7 may be filled with a sealing agent in which fibers are mixed with grease oil or the like. Good.

As shown in FIG. 4C, when the seal members 20 in the rear row get over the tail seal 24 of the shield excavator, the seal members 20 in the front row are positioned at the rear as shown in FIG. When the seal member 20 in the front row gets over the tail seal 24 of the shield machine, the seal member 2 in the rear row
0 is set as an interval for sealing with the segment 21. Thereby, at least one of the seal members 20 always exerts a sealing function, so that the sealing property at the time of getting over can be ensured. In addition, the sealing member 20
The number of rows is not limited to two, but may be three or more.

The shaft 1 shown in FIGS. 1 (a) and 1 (b) having the above structure is buried underground as shown in FIGS. 2 (a), 2 (b) and 2 (c). First, as shown in FIG. 2 (a), on the ground,
The shaft 1 shown in FIGS. 1 (a) and 1 (b) in which the front body 6 of the shield machine is attached to the starting port 4 of the side wall 2 so as to cover the starting port 4.
And place it on the ground 26. At this time, FIG.
The opening and closing shutter 12 of the screw conveyor base 10 shown in FIGS. 1A and 1B is closed by a cylinder 13.

The shaft 1 has a leg 28 formed in a ring shape along the edge on the bottom surface 27 of the bottom wall 3, so that when the shaft 1 is placed on the ground 26, the leg 28 and the bottom surface 27 The work space 29 is defined by the ground 26. The ground 30 in the work space 29 is
Drilled by one. The digging device 31 includes a trolley portion 32 that moves by engaging with a guide rail laid on the bottom surface 27 along the circumferential direction of the shaft 1, and a bucket portion attached to the trolley portion 32 via an elevating mechanism and a telescopic cylinder. 3
3 and the work space 2
The whole area of the ground 30 in 9 can be excavated. The earth and sand excavated by the excavating device 31 is
It is transported upward by a soil discharging bucket 35 that moves up and down.

When the ground 30 in the work space 29 is excavated by the excavator 31, the shaft 1 is dropped by its own weight in accordance with the excavation, as shown in FIGS. 2 (b) and 2 (c). . The shaft 1 is dropped into the work space 29.
It is appropriately controlled by supplying compressed air from a compressor (not shown). That is, by adjusting the air pressure in the work space 29 by the compressor, the drop force by the dead weight of the shaft 1 and the lifting force by the air pressure are balanced, and the drop is controlled. In this way, the shaft 1 is lowered to a predetermined depth as shown in FIGS. 2 (c) and 3 (a).

At this time, since the front body 6 functions as a cover member for closing the starting port 4, groundwater and earth and sand are not spouted in the shaft 1. That is, as shown in FIGS. 1 (a) and 1 (b), the side ground 36 and the inside of the shaft 1 are separated by the partition wall 8 in the front trunk shield frame 7 of the front trunk 6,
Sediment and groundwater do not enter the shaft 1. Also,
Since the opening and closing shutter 12 of the screw conveyor base 10 is closed, groundwater and earth and sand do not erupt from the screw conveyor base 10. Further, between the front body shield frame 7 and the base bracket 18, seal members 20, 2 are provided.
Since 0 is provided, groundwater and earth and sand do not erupt from between them.

Further, since only the front body 6 of the shield machine is mounted at the starting port 4 of the shaft 2, the discharging device (the discharging bucket 35 and the pressure holding pipe 34) is installed in the shaft 1.
) Can be secured. That is, as shown in FIG. 3 (b), when the shield excavator 42 of a complete form is installed so as to close the starting port 4, the shield excavator 42 is disposed substantially at the center of the shaft 1 shown in FIGS. 2 (a) and 2 (b). This makes it impossible to install a soil removal device (such as the soil removal bucket 35 or the atmospheric pressure holding pipe 34). However, if the above-described unloading device (such as the unloading bucket 35 and the atmospheric pressure holding pipe 34) is arranged at the corner 38 of the shaft 1 (see FIG. 1A), as shown in FIG. It is also possible to install a shield excavator 42 of a complete form in advance so as to close the launch port 4.

As shown in FIGS. 2 (c) and 3 (a), when the shaft 1 is buried to a predetermined depth, the remaining portion of the shield excavator 42 (from the opening at the top of the shaft 1 by a crane) Rear trunk 39) and screw conveyor extension 14
The gantry 40 and the reaction force receiving member 41 are carried into the bottom of the shaft 1, and the gantry 40 is installed on the shaft bottom wall 3, as shown in FIG. Connected to form a complete shield machine 42, the screw conveyor extension 14 is connected to the base 10 to form a complete screw conveyor 15, and the reaction force receiving member 41 is installed on the rear side wall 2 of the rear trunk 39.

The rear trunk portion 39 seals a space between the rear trunk shield frame 43 formed in a cylindrical shape, a plurality of propulsion jacks 44 provided inside the rear trunk shield frame 43 at predetermined intervals in the circumferential direction, and the segment 21. And a tail seal 24. The segment 21 is assembled in the rear trunk shield frame 43 by an unillustrated erector, and serves as a substantial tunnel wall and also serves as a thrust transmitting member for transmitting the thrust of the propulsion jack 44 to the reaction force receiving member 41. Between the rear torso shield frame 43 and the front torso shield frame 7, a middle bend seal 45 is provided and a middle bend jack (not shown) is provided.

When the complete shield excavator 42 is assembled at the bottom of the shaft 1 in this way, the propulsion jack 44 is operated to position the excavator 42 against the earth pressure of the side ground 36. After being held, the detachable metal fitting 19 is separated from the front torso shield frame 7 and removed. Then, the open / close shutter 12 of the screw conveyor 15 is opened. At this time, earth pressure and water pressure applied to the inside of the screw conveyor 15 are held by a shutter, a rotary feeder, and the like (not shown) provided at the outlet 46 of the conveyor 15. Preparation for starting is thus completed.

Thereafter, as shown in FIGS. 4 (c) and 4 (d), the propulsion jack 44 is extended while rotating the cutter 9, and the shield machine 42 is started from the start port 4 toward the side ground 36. Let it. When the propulsion jack 44 is fully extended, it is contracted to form a space, and the sediment discharged from the outlet 46 of the screw conveyor 15 or the point where the segment 21 is assembled by the erector is conveyed by a belt conveyor or a truck. About points etc., it is the same as that of a normal shield machine.

According to this embodiment, the shield machine 42
Starting from the shaft 1 is started by starting the shield excavator 42 in a state where the shield excavator 42 is covered with the starting port 4 of the shaft 2 of the shaft, so that the excavator a required in the prior art shown in FIG. No demolition or cutting work of the front shaft wall g is required at all. Therefore, it is possible to avoid filling the pit 1 with dust that is generated during the demolition work and the cutting work, so that the working environment is improved and the safety is improved.

In the prior art shown in FIG. 5, if the side wall g in front of the excavator a is a special wall that can be excavated,
Since it is necessary to attach a special bit capable of cutting a special wall to the cutter h of the excavator a, the excavator a itself increases in cost, and the cutter h
However, according to the present embodiment, the cutter 9 of the excavator 42 has only the ground 36 without excavating the shaft side wall 2 at all. , The cutter 9 only needs to be fitted with a normal earth and sand digging bit 11,
The cost reduction of the excavator 42 itself can be promoted, and a decrease in the excavating ability can be avoided.

In the prior art shown in FIG. 5, the dimension D (inner diameter) of the shaft c is adjusted to "the total length L of the machine a" in order to accommodate the completed shield machine a at the bottom of the shaft c. According to the present embodiment, as shown in FIGS. 1 (a) and 1 (b), the front body 6 of the shield machine 42 attached so as to cover the starting port 4 is required. Since the part 6a is buried in the thickness T of the side wall 2, the dimension D of the shaft 1 can be reduced by the amount of the buried portion (length T). That is, according to the present embodiment, the dimension D (inner diameter) of the shaft 1 is “the total length L of the excavator 42” − “the length embedded in the thickness of the side wall 2, as shown in FIG. T ". Reducing the dimension D of the shaft 1 not only reduces the cost of the shaft 1 itself, but also reduces the work site area on the ground, so that the effect of the construction on the ground is reduced.

[0035]

As described above, according to the shaft structure for starting a shield excavator and the method for starting a shield excavator according to the present invention, the cutting work of the shaft is not required and the shaft size can be reduced. Cost reduction can be promoted, construction period can be shortened, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a shaft structure for starting a shield excavator according to an embodiment of the present invention. FIG. 1 (a) is a horizontal sectional view, and FIG. 1 (b) is a vertical sectional view.

2 is a diagram showing a process of burying a shaft in the ground, FIG. 2 (a) is a first step diagram, FIG. 2 (b) is a second step diagram,
FIG. 2C is a third step diagram.

FIGS. 3A and 3B are explanatory diagrams showing a starting method of the shield machine according to the embodiment of the present invention. FIG. 3A is a first step diagram, and FIG. 3B is a second step diagram.

FIG. 4 is an explanatory view showing a continuation of the above-described starting method, and FIG.
FIG. 4C is a third step diagram, and FIG. 4D is a fourth step diagram.

FIG. 5 is an explanatory view of a shaft structure for starting a shield machine as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical shaft 2 Side wall 4 Start-up port 6 Front part as a part of shield machine 39 Rear part as the rest of shield machine 42 Shield machine

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yoshihiko Tabata 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Inside (72) Inventor Tomokazu Matsui 1 Higashi-Shinmachi, Higashi-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Stock In-house (72) Inventor Koji Yamada 1 Higashi-shinmachi, Higashi-ku, Nagoya-shi, Aichi Prefecture Inside Chubu Electric Power Co., Inc. (72) Inventor Yoru Yoshida 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima Harima Heavy Industries Ltd. 72) Inventor Yuji Sakuma 11-1, Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd.Aichi Plant (72) Inventor Takashi Watari 11-11 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. Terms (reference) 2D054 AC01 EA01 EA07

Claims (3)

[Claims] 1. A starting port formed on a side wall of a shaft which serves as a starting base of a shield excavator, and a part or all of a shield excavator detachably attached to the starting port so as to cover the starting port. And a shaft structure for starting a shield machine. 2. A pit in which a part of a shield machine is attached so as to cover a start port of a side wall, and the shaft is buried underground. A shield excavation machine connected to a section of the vehicle to complete the shield excavation machine, and the shield excavation machine is started from a start port. 3. A shield, wherein a shaft having a shield excavator attached to a start opening of a side wall so as to cover the same is buried in the ground, and the shield excavator is started from the start opening. How to start the excavator.