JP2002250197A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield machine that can efficiently convey segment and exhaust earth in a narrow underground mine. SOLUTION: In a shield machine which takes in excavated earth into a chamber 3 and supports a facing with earth pressure, and then conveys the excavated earth with a screw conveyor 4 into a main body 1 of the shield machine, an mud stock chamber 7 to stock the excavated earth is provided into the main body of the shield machine. Simultaneously a distance between the screw conveyor 7 and the mud stocking chamber 7 is connected by an excavated earth conveyance pipe line 8 which is opened or closed by a gate valve 9, and the mud stocking chamber 7 is connected to a water supply pump 12 installed on the ground with a water supply pipe 10. With a state that the excavated earth conveyance pipe line 8 is closed by the gate valve 9, water is supplied into the mud stacking chamber using water pimp 12. Thus, the shield machine is composed in such a way that the excavated earth in the mud chamber 7 can be sent up to the ground through a mud discharge pipe 11 without an earth relay pump installed inside the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth pressure shield excavator for supporting a face by earth pressure of excavated earth and sand, and more particularly, to an earth pressure shield excavator suitable for constructing a small-diameter underground pit having a finished inner diameter of 1350 mm or less. It is.

[0002]

2. Description of the Related Art In a shield method, a shield excavator excavates a face to form an underground pit, assembles segments on the peripheral wall of the underground pit, linings, and excavates excavated earth and sand generated by excavation of the face. Discharge. As such a shield method, a muddy water shield method and an earth pressure type shield method are well known. Of these, in the muddy shield method, excavated earth and sand is muddy and taken into the chamber, the cutting face is supported by the muddy water pressure in the chamber, and the muddy excavated earth and sand in the chamber is passed through the shield body and the underground pit. It is discharged to the outside of the mine by a mud pipe. In the earth pressure type shield method, excavated earth and sand is plasticized and fluidized as needed, and is taken into the chamber.The face of the excavated earth and sand in the chamber is supported by the earth pressure of the excavated earth and sand. After the excavated sediment is transferred into the shield body by the excavated sediment transfer device, the excavated sediment is transferred to a slippery carriage, transported to the starting shaft, and discharged out of the pit.

An object of the present invention is to improve a shield machine used for implementing the latter earth pressure shield method. In the normal earth pressure type shield construction method, in order to discharge the excavated earth and sand to the outside of the mine and transport the segment to the segment assembling site, a slip bogie that transports the excavated earth and sand in the shield body to the starting shaft, The segment is transported along with a segment transport vehicle that transports the segment to the vicinity of the segment assembly site at the rear of the shield main body. Therefore, a track common to both vehicles is laid in the underground shaft. In addition, in the underground mine,
Tracks for running multiple succeeding bogies each equipped with a power unit, control panel, power panel, etc. are also laid,
The trailing bogie is moved with the excavation of the shield excavator. In this case, the segment transport trolley, the shear trolley, and the subsequent trolley are arranged so as not to interfere with each other during traveling.

[0004] However, it becomes increasingly difficult to arrange the slip bogies and the following bogies side by side so as not to interfere in the tunnel, as the diameter of the underground tunnel becomes smaller. For this reason, in the small-diameter shield construction method in which the finished inner diameter of the underground pit is about 1350 mm or less, the segment transport vehicle and the shearing vehicle are sequentially arranged in series after the succeeding bogie following the shield body and run, and excavation of clew conveyors and the like is performed. A belt conveyor is erected between the sediment transporting device and the shearing carriage using the space above the succeeding bogie and the segment carrier, and the excavated sediment transported into the shield body by the excavating sediment transporting device is sheared by the belt conveyor. The method of carrying in is adopted.

[0005] When transporting segments and discharging excavated earth and sand by such a method, first, before starting the excavation of the shield excavator, the segment transport truck loaded with the segments and the empty shear truck are sequentially approached behind the succeeding bogie. Move to let. Next, the segments loaded on the segment transport trolley are lowered into the mine, and after excavation is started, excavated earth and sand is carried into the shear trolley by the belt conveyor. When the segment is assembled after excavating one ring of the segment through such a process, the slip carriage and the segment carrier are sequentially returned to the starting shaft. Next, after transferring the excavated soil in the slip bogie to the sediment reservoir in the starting shaft and loading a new segment into the segment transport bogie, the segment transport bogie and the shear bogie are transferred to the subsequent bogie until the next excavation starts. It is transported again to the side, and thereafter, the same process is repeated to transport the segment and discharge the excavated earth and sand.

However, by such a method,
When the diameter of the underground pit becomes smaller than 1350 mm, it becomes difficult to obtain a sufficient head space above the succeeding bogie and the segment transport bogie to mount a belt conveyor. Therefore, even if such a method is adopted, it can be adopted only for an underground pit having a finished inner diameter of at most about 1200 mm (the outer diameter of the shield body is about 19630 mm). In addition, in this method, since both the slip bogie and the segment transport bogie must be repeatedly reciprocated in a narrow underground mine, there is also a problem that the working efficiency is remarkably reduced particularly when the shield boring machine is excavated for a long distance. occured.

On the other hand, in order to construct such a small-diameter underground pit, recently, a special shield method called a mini-shield method in which segment transportation and discharge of excavated earth and sand are alternately performed. In this mini-shielding method, devices mounted on a succeeding bogie such as a power unit, a control panel, and a power panel are installed in a shield body. Then, after the excavated sediment transferred into the shield main body by the excavated sediment transfer device such as a screw conveyor is put into the sediment receiver, the sediment in the sediment receiver is screwed through the excavated sediment feed line into the slipper truck behind the sediment receiver. Feeding is performed by a feeder, and during this time, the segment carrier truck loaded with the segments is made to stand by in the starting shaft.

When the segment is conveyed and the excavated earth and sand is discharged by the mini-shield method, the excavated earth and sand is fed into the slip carriage as described above after the shield excavation is started. When the excavation for one ring of the segment is completed through this process, the bogie containing the excavated sediment is cut off from the excavated sediment feeding line, and then sent to the starting shaft to remove the excavated sediment in the bogie from the starting shaft. Transfer to a sand basin. Further, when the slip cart is sent to the starting shaft, the segments are loaded, the segment carrier cart that has been waiting is run, moved to near the segment assembling site, and the segment is lowered into the shaft. Next, at the rear part of the shield body, the segment is assembled, and after the segment assembling operation is completed, the segment carrier is returned to the starting shaft. When the segment transport trolley arrives at the starting shaft, this time, the empty slip trolley is transported again to the back of the sediment receiver and connected to the excavation sediment introduction pipe, and thereafter, the same process is repeated to transport the segment and excavate sediment. And discharge are performed alternately.

In this mini-shielding method, when the excavated earth and sand transported into the shield body is carried into the slip bogie, a belt conveyer is installed in the upper space of the succeeding bogie and the segment transport bogie as described above. Since the excavated sediment feeding pipe line that does not take up space is connected to the slip bogie, a smaller diameter underground pit can be constructed than the above method. However, in the mini-shield method, the transport of the segments and the discharge of the excavated earth and sand are performed alternately, not in parallel. Therefore, when excavating over a long distance exceeding 1000 m, the time for the traffic between the slip bogie and the segment transport bogie is required. Has become extremely long, and again, there has been a problem that the working efficiency is reduced.

[0010]

As described above, the conventional shield method is suitable for the construction of a small-diameter underground pit, but both the slip carriage and the segment carrier are used in a narrow underground pit. There was a problem in terms of work efficiency because the robot had to reciprocate repeatedly while repeating. In particular,
Recently, the need to perform long-distance construction with shield excavators has increased dramatically.However, if long-distance construction is performed using the conventional shield method, it takes enormous time to transport segments and discharge excavated earth and sand. Since the efficiency is remarkably reduced, it is desired to develop a shield machine capable of solving such difficulties.

The present invention has been made to meet such a demand, and a technical problem of the present invention is to provide a shield excavator capable of efficiently transporting and discharging a segment in a narrow underground pit. .

[0012]

SUMMARY OF THE INVENTION The technical object of the present invention is to provide a shield body, a cutter head provided in front of the shield body for excavating a face, and an excavated earth and sand provided between the cutter head and the shield body. And an excavation earth and sand transfer device that can transfer the excavation earth and sand in the chamber into the shield body and adjust the amount of the excavation earth and sand to adjust the earth pressure of the chamber. In a shield machine that discharges excavated earth and sand to the ground and transports the segment to the segment assembling site, excavation installed in or behind the shield body so that it can move together with the shield body and transferred by the excavated earth and sand transfer device Mud storage chamber for storing sediment, and excavated sediment that carries excavated sediment transferred by the excavated sediment transfer device into the mud storage chamber An inlet pipe and an opening / closing device for opening and closing the excavated sediment carrying pipe were provided, the mud storage chamber was connected to a water pump installed on the ground or in a starting shaft, and the excavated sediment carrying pipe was closed with the opening / closing apparatus. By sending water with a water pump into the mud storage chamber in the state, the excavated sediment in the mud storage chamber can be placed on the ground or in the start shaft, even if the mud relay relay pump is not provided in the underground mine formed by the excavation of the shield machine. This is achieved by being configured to be able to be sent by a pipeline.

[0013] Since the shield machine of the present invention is configured as described above, during excavation, the excavated sediment in the chamber transferred into the shield main body by the excavated sediment transfer device is stored in the excavated sediment carry-in channel. It can be carried into the chamber and stored. At that time, the pressure control of the chamber can be appropriately performed by adjusting the transfer amount of the excavated earth and sand. When the excavation is stopped for a predetermined length while discharging the excavated sediment in the chamber in this manner, the excavated sediment carrying-in pipeline is closed by the opening / closing device, and the water is pumped into the mud storage chamber by the water supply pump. The excavated sediment accumulated in the mud storage chamber can be piped to the ground or into a starting shaft.

In this case, since the water is pumped into the mud storage chamber with the excavated sediment carrying pipe closed by the opening and closing device, the excavated sediment transporting device and the mud storing chamber are directly connected by the excavated sediment carrying pipe to store the water. Even when the excavated earth and sand is carried into the mud chamber, the pressure of the water supply pump does not act on the chamber, and the pressure of the chamber is appropriately maintained. Therefore, even if the pressure of the water supply pump is increased to a pressure sufficient to send excavated earth and sand into the ground or into the starting shaft, there is no adverse effect on the face, so the mud type shield excavator is provided. There is no need to install such a drainage relay pump in an underground pit formed by excavation. As a result, the space in the underground mine where the segment carrier truck travels is not narrowed by the mud discharging relay pump.

As described above, in the shield machine according to the present invention, the excavated earth and sand transferred into the shield main body can be sent to the ground or into the starting shaft by the water supply pump by a pipe, so that it can be used even in a narrow underground shaft. , Can be efficiently discharged. In addition, since it is not necessary to transport with a slipper unlike the conventional method, the underground pit formed by excavation can be used as a traveling space dedicated to the segment transport trolley, in which case the space in the underground pit is relayed by mud relay. There is no need to narrow with a pump. Therefore, even in a narrow underground mine, the segment carrier can be freely moved back and forth to efficiently transport the segment to the segment assembling site.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, various embodiments of how the present invention is actually embodied will be described with reference to FIGS. 1 to 3 to clarify the embodiments of the present invention. . FIG. 1 is a longitudinal sectional view showing a state where a shield construction method is performed by a shield machine according to a first embodiment of the present invention;
FIG. 2 is a longitudinal sectional view showing a state where a shield construction method is being performed by a shield machine according to a second embodiment of the present invention.
FIG. 6 is a longitudinal sectional view showing a state where a shield construction method is being performed by a shield machine according to a third embodiment of the present invention.

First, a shield machine according to a first embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a shield body which comprises a front body 1a and a rear body 1b and forms a body of a shield machine.
Reference numeral 1c denotes a bulkhead as a partition wall for shielding the inside of the shield main body 1 from the outside of the machine, 2 denotes a cutter head which is rotatably installed in front of the shield main body 1 via the bulkhead 1c and excavates a face, and 2a denotes the cutter head 2a. Drive device for driving the rotation of the cutter head 3 and the cutter head 2 and the bulkhead 1
and c, a screw conveyor as an excavated earth and sand transfer device for transferring the excavated earth and sand in the chamber 3 into the shield body 1 by taking up and filling the excavated earth and sand to support the face at earth pressure. Reference numeral 4a denotes a motor for rotationally driving the screw conveyor 4;
Is a shield jack that is provided in the circumferential direction of the shield body 1 and propells the shield body 1 while taking a reaction force by the existing segment 25. 6 is a plurality of shield jacks provided in the circumferential direction of the shield body 1 and attaches the front body 1a to the rear body. This is a center-folding jack that tilts the shield main body 1 by tilting with respect to 1b.

The shield machine excavates a face with the cutter head 2 while propelling the shield body 1 with the shield jack 5 to form an underground pit. At this time, the collapse of the face is prevented by applying earth pressure by the excavated earth and sand in the chamber 3. An additive for plastically fluidizing the excavated earth and sand taken into the chamber 3 is injected into the chamber 3 as needed, and is mixed with the excavated earth and sand in the chamber 3 by stirring. The face is supported by the earth pressure of the excavated earth and sand in the plastic flow generated in this way, and the collapse is prevented. This excavated earth and sand is transferred into the shield main body 1 by the screw conveyor 4, and the amount of excavated earth and sand transferred can be adjusted by the rotation speed of the screw conveyor 4. Therefore, the earth pressure in the chamber 3 is
By adjusting the number of revolutions of the screw conveyor 4, the transfer amount of excavated earth and sand can be adjusted to an optimum value for supporting the face. The technical contents described above are common to the general technical contents of an earth pressure type shield excavator that supports a face with earth pressure. INDUSTRIAL APPLICABILITY The present invention is applied to an earth pressure type shield machine, regardless of whether it is a center-fold type or not.

Reference numeral 7 denotes a mud storage chamber for storing the excavated sediment transferred into the shield main body 1 by the screw conveyor 4, and reference numeral 8 denotes an excavated sediment transporting the excavated sediment transferred by the screw conveyor 4 into the mud storage chamber 7. A pipe 9 is a gate valve as an opening / closing device for opening and closing the excavated sediment carrying-in pipe 8, 10 is a water pipe for supplying pressurized water pressurized by a water pump 12 described later into the mud storage chamber 7, and 11 is a storage pipe. A mud pipe for discharging the excavated earth and sand in the mud chamber 7 to the ground, 12 is a water pump installed on the ground near the starting pit to generate pressurized water and supply it to the water pipe 10, and 13 is an auxiliary equipment of the shield machine It is a trailing bogie for mounting.

In the example shown in FIG. 1, the mud storage chamber 7 is installed in the shield main body 1 and is arranged adjacent to the screw conveyor 4. Since the excavated sediment carrying-in line 8 is formed by a short pipe which directly connects the screw conveyor 4 and the mud storage chamber 7, the excavated sediment transferred by the screw conveyor 4 passes through the excavated sediment carrying-in conduit 8. It is fed into the mud storage chamber 7 without much resistance. Although the mud storage chamber 7 is installed in the shield main body 1 in the example shown here, it may be installed behind the shield main body 1 and pulled by the shield main body 1 as described later. As long as the shield excavator is installed so that it can move together with the shield main body 1 when the shield excavator excavates, the shield excavator may be installed inside or behind the shield main body 1.

The water pipe 10 is laid so as to be connected to the mud storage chamber 7 from the water pump 12 via the starting shaft and the underground shaft. Similarly, the drainage pipe 11 is laid so as to be connected from the mud storage chamber 7 to a muddy water treatment facility on the ground via an underground shaft and a starting shaft. Although not explicitly shown in the figure, the starting shaft is located at a position where the water supply pipe 10 and the drainage pipe 11 have risen. The water pump 12 supplies high-pressure water into the mud storage chamber 7 to increase the fluidity of the excavated sediment in the mud storage chamber 7 to make it muddy, and pressurizes the mud storage chamber 7 with high-pressure water. , And serves to send excavated earth and sand to a muddy water treatment facility on the ground through a drainage pipe 11. In the example of FIG. 1, since the screw conveyor 4 and the mud storage chamber 7 are directly connected by the excavated sediment carrying pipeline 8, when the water supply pump 12 pressurizes the mud storage chamber 7, the pressure is transmitted to the chamber 3. Therefore, the pressure in the chamber 3 may be unnecessarily increased to adversely affect the face. The gate valve 9 has a function of closing the excavated sediment carrying-in pipeline 8 so that the pressure does not act on the face when the inside of the mud storage chamber 7 is pressurized by the water supply pump 12.

At first glance, such an earth removal method is similar to the earth removal method of the muddy shield excavator. However, in the muddy shield excavator, the pressure of the muddy water supplied to the chamber is optimized for supporting the face. It is necessary to maintain the pressure, and the soil must be drained by the pressure. Therefore, the flow velocity in the drain pipe 11 decreases on the way due to the lack of pressure, and a mud relay pump for compensating for the lack of pressure needs to be shielded. It is necessary to provide them appropriately in various places in the underground mine formed by the machine. On the contrary,
In this earth pressure type shield excavator, the pressure in the chamber 3 is adjusted by the transfer amount of the excavated earth and sand as described above, and the pressure of the water pump 12 is not applied to the face, so that the excavated earth and sand is appropriately applied. The pressure of the water supply pump 12 can be set to a pressure high enough to be sent to the ground at the flow rate, and it is not necessary to install a mud relay pump in the underground pit, which hinders the traveling of the segment carrier.

There is no need to strictly control the viscosity and specific gravity of the water supplied into the mud storage chamber 7 by the water pump 12 unlike the muddy water shield. In the example shown here, the water pump 12
Is installed on the ground, so the head between the ground and the underground pit,
The water pump 12 may be installed in a starting shaft, although it can be used for a force for sending excavated earth and sand. In the example shown here, the excavated earth and sand in the mud storage
2, the auxiliary pump is provided in the starting shaft and the excavated soil in the mud storage chamber 7 is sent to the auxiliary pump in the starting shaft by the water supply pump 12, and the excavation sent to this auxiliary pump is performed. The earth and sand may be discharged to a muddy water treatment facility on the ground by an auxiliary pump.

FIG. 1 shows a trailing truck 1 having an oil tank incorporating a power unit as the trailing truck 13.
3a shows a trailing bogie 13b equipped with a control panel and a trailing bogie 13c equipped with a power board. These trailing trucks 13a, 13b, and 13c are connected to each other, and are installed behind the segment assembling device 20 described below so as to be pulled by the shield body 1. In addition, when carrying out the shield construction method with this shield machine, a segment carrier is used, but the segment carrier is not shown.

Reference numeral 20 denotes a segment assembling apparatus for grasping and positioning the segment pieces and assembling the segments 28 along the peripheral wall of the excavated underground pit. The segment assembling apparatus 20 can be roughly classified into an erector main body 21 for gripping a segment piece, a turning wheel 22 for turning the erector body 21, a turning motor 23 for driving the turning wheel 22 and a turning motor for turning the turning wheel 22. It comprises a pivoting wheel support frame 24 that supports the pivotal wheel, a sliding jack 25 that drives the pivoting wheel support frame 24 back and forth, and a sliding jack support frame 26 that supports the sliding jack 25. The erector body 21 has a segment grip device for gripping the segment piece and a pressing jack capable of moving the segment piece in the radial direction of the shield body 1, and is attached to the front end of the turning wheel 22. Rollers 27 for sliding the segment pieces mounted on the upper outer peripheral portions are provided on the upper outer peripheral portions of the revolving wheel support frame 24 and the sliding jack support frame 26, respectively.
Are provided, and wheels are provided below the turning wheel support frame 24 and the sliding jack support frame 26, respectively. The two support frames 24 and 26 roll the wheels and follow the shield machine when the shield machine excavates.

Since the segment assembling apparatus 20 has such a structure, the segment pieces transported by the segment transport cart can be gripped by the segment grip device of the erector body 21 and the revolving wheel support frame 24 slides. By moving with the jack 25, the gripped segment piece can be moved in the axial direction of the shield main body 1. Further, by rotating the revolving wheel 22 by the revolving motor 23, the gripped segment piece can be revolved in the circumferential direction of the shield main body 1, and the segment piece is moved in the radial direction by the pressing jack of the erector main body 21. can do. The segment assembling apparatus 20 can assemble the segment 28 by positioning the segment piece at a predetermined position by combining these operations.

On the other hand, in the segment assembling apparatus 20, since the rollers 27 are particularly provided on the upper outer peripheral portions of the revolving wheel support frame 24 and the jack support frame 26, the segment pieces transported by the segment transport vehicle after the succeeding vehicle 13c are provided. Can be transferred onto the support frames 24 and 26, and can be conveyed to the erector main body 21 by sliding with the rollers 27 while guiding the upper outer peripheral portion. Revolving wheel support frame 24 and sliding jack support frame 2
6 is such that the shield body 1 can be assembled by the erector body 21 at the rear part of the shield body 1.
It is installed in an underground mine near the rear end, and moves in the underground mine as the shield body 1 advances. By installing the support frames 24 and 26 as support portions of the segment assembling apparatus 20 outside the shield main body 1 in this manner, it is possible to suppress a decrease in the effective space in the small-diameter narrow and narrow shield main body 1 and to reduce the shield. The length of the excavator is not lengthened, and the excavation in a curved shape by the operation of the center bending jack 6 can be performed smoothly.

A method of performing a shield method using the shield machine of the first embodiment will be described. When the shield excavator is excavated by excavating the face with the cutter head 2 while propelling the shield main body 1 with the shield jack 5, excavated earth and sand generated by excavation of the face loses the chamber 3.
The mixture is taken in, and additives are added as required, followed by stirring and mixing. Then, the excavated earth and sand is plastically fluidized to raise the earth pressure, and the face is supported by the earth pressure. The excavated earth and sand in the chamber 3 is transferred into the shield main body 1 by the screw conveyor 4, and the pressure in the chamber 3 can be appropriately controlled by adjusting the transfer amount of the excavated earth and sand.

At this time, since the gate valve 9 is open, the excavated sediment transferred into the shield main body 1 by the screw conveyor 4 is carried into the mud storage chamber 7 through the excavated sediment carry-in line 8 and stored therein. Can be When the excavation in the chamber 3 is discharged and the excavation is stopped and the excavation is stopped by closing the gate valve 9, the excavated sediment carrying-in line 8 is closed.
In this state, when the water supply pump 12 is driven to supply water into the mud storage chamber 7 through the water supply pipe 10, the inside of the mud storage chamber 7 is pressurized. , And is sent to a muddy water treatment facility on the ground through a drainage pipe 11.

In this case, the water pump 1 is inserted into the mud storage chamber 7 with the excavated sediment carrying-in line 8 closed by the gate valve 9.
2, the pressure of the water pump 12 is
, And the pressure in the chamber 3 is appropriately maintained. For this reason, even if the pressure of the water pump 12 is increased to a pressure sufficient to send the excavated earth and sand to the ground, there is no adverse effect on the face, so that the drainage pump provided by a muddy shield excavator is used. There is no need to install a mud relay pump in an underground pit formed by excavation.
As a result, the space in the underground mine where the segment carrier truck travels is not narrowed by the mud relay pump.

As described above, in the shield machine, the excavated earth and sand transferred into the shield body 1 is stored in the mud storage chamber 7.
, So that it can be sent on the ground by the water pump 12 through the mud pipe 11 without being transported by the slip cart.
Even in a narrow underground mine, it is possible to discharge soil efficiently.
In addition, since it is not necessary to transport the vehicle by a slipper unlike the conventional method, the underground pit formed by excavation can be used exclusively as a traveling space for the segment transport trolley. In this case, the space in the underground mine is drained. There is no need to narrow with a relay pump. Therefore, even in a narrow underground pit, the segment carrier can be freely moved back and forth to transport the segment to the segment assembling site without any delay. Therefore, in the shield machine, the transport of the segments and the discharge of the soil can be efficiently performed in the narrow underground pit. As a result, when performing a long-distance construction, there is no such a problem that the work efficiency is remarkably reduced by taking a long time for transporting the segments and discharging the excavated earth and sand unlike the conventional technique.

Next, a shield machine according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the parts denoted by the same reference numerals as those in FIG. 1 represent the same parts as those in FIG.

The shield machine is provided so as to be movable with the shield main body 1 and stores a mud storage chamber 7 for storing excavated sediment transferred by the screw conveyor 4, and a mud storage chamber 7 for storing excavated sediment transferred by the screw conveyor 4. An excavated sediment carrying pipe 8 to be carried into the chamber 7 and a gate valve 9 for opening and closing the excavated sediment carrying pipe 8 are provided. The mud storage chamber 7 is connected to a water supply pump 12 installed on the ground, and excavation is performed. By feeding water with a water pump 12 through a water pipe 10 into the mud storage chamber 7 in a state where the sediment carrying pipe 8 is closed by the gate valve 9, a mud relay relay pump is inserted into the underground pit formed by the excavation of the shield excavator. Even if not provided, the excavated sediment in the mud storage chamber 7 can be sent to the ground through the mud pipe 11 in that It does not change the field excavator.

The difference between the shield machine and the shield machine according to the first embodiment will now be described. In this shield machine, the mud storage chamber 7 is provided behind the shield body 1. That is, the mud storage chamber 7 is installed near and behind the sliding jack support frame 26 in the segment assembling apparatus 20, and the succeeding bogie 13 is installed behind this mud storage chamber 7. The excavated sediment carrying-in pipeline 8 is, as in the first embodiment, the screw conveyor 4.
And the mud storage chamber 7 are directly connected to each other. However, since the mud storage chamber 7 is installed behind the segment assembling apparatus 20, the mud storage chamber 7 is formed of a long pipe, and the resistance of the pipe is reduced in the first embodiment. Larger than possible.

For this reason, the vacuum pump 14 for reducing the pressure in the mud storage chamber 7 is connected to the mud storage chamber 7 so that the excavated sediment can be carried into the mud storage chamber 7 without stagnation through the excavated sediment carry-in line 8. Connected by pipe. By providing such a vacuum pump 14, the excavated earth and sand sent from the screw conveyor 4 into the excavated earth and sand carrying pipe 8 can be sucked and carried into the mud storage chamber 7. In FIG. 2, the vacuum pump 14 is shown outside the underground pit for convenience of illustration, but the vacuum pump 14 can be provided near the mud storage chamber 7.

Since the shield machine has such a structure, in addition to the above-mentioned effect that the segment can be efficiently transported and unloaded in a narrow underground pit, the excavated earth and sand can be carried in. Even when the pipe 8 is formed by a long pipe, the excavated earth and sand transferred by the screw conveyor 4 can be carried into the mud storage chamber 7 without any trouble. Further, by installing the mud storage chamber 7 behind the shield main body 1, the mud storage chamber 7 can be installed in an underground pit having more space than in the shield main body 1. Maintenance such as cleaning and repair can be easily performed. here,
An example is shown in which the vacuum pump 14 is provided when the excavated sediment carrying line 8 is formed by a long pipe.
When the vacuum pump 14 is provided when is formed by a short tube,
The clogging of the excavated earth and sand carrying pipe 8 with the excavated earth and sand can be prevented.

Finally, a shield machine according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 3, the parts denoted by the same reference numerals as those in FIGS. 1 and 2 represent the same parts as those in FIGS.

The shield machine, similar to the shield machine of the second embodiment, is provided behind the shield body 1 so as to be able to move together with the shield body 1 and is used for storing the excavated earth and sand transferred by the screw conveyor 4. A mud storage chamber 7, an excavated sediment carrying pipe 8 for carrying excavated sediment transferred by the screw conveyor 4 into the mud storing chamber 7, and an opening / closing device for opening and closing the excavated sediment carrying pipe 8 are provided.
The mud storage chamber 7 is connected to a water supply pump 12 installed on the ground, and water is pumped into the mud storage chamber 7 by a water supply pump 12 through a water supply pipe 10 in a state where the excavated sediment carrying-in line 8 is closed by a switchgear. The construction is such that the excavated earth and sand in the mud storage chamber 7 can be sent to the ground through the mud pipe 11 without providing a mud relay relay pump in the underground pit formed by the excavation of the shield machine. When the mud storage chamber 7 is installed behind the shield main body 1, the mud storage chamber 7 is installed behind the segment assembling apparatus 20, and the trailing bogie 13 is installed behind the mud storage chamber 7. A vacuum pump 14 for reducing the pressure in the inside 7 is connected to the mud storage chamber 7 by a pipeline, and the basic structure is the same as the shield machine of the second embodiment.

The difference between the shield machine and the shield machine according to the second embodiment will now be described. In the shield machine, the excavated earth and sand transfer device is constituted by a discharge pipe 15 provided with a pinch valve 16. , This discharge pipe 15
, Like the screw conveyor 4, is attached to the bulkhead 1c and installed on the side of the front trunk 1a. When the excavated sediment carry-in line 8 is provided, a sediment pit 17 capable of receiving and storing the excavated sediment transferred by the excavated sediment transfer device is installed in the rear body 1b of the shield body, and the excavated sediment carry-in conduit 8 is provided. Is connected to the earth and sand pit 17. Above the sediment pit 17, a gravel separating device 18 such as a screen for separating the gravel in the excavated sediment is attached to the lower part of the earth discharging pipe 15 and installed. The excavated sediment carrying-in pipeline 8 can be opened and closed by an opening and closing device (not shown).

The pinch valve 16 is, in the example shown here,
An elastic body 16a is provided along the inner peripheral wall of the discharge pipe 15 so as to form an air chamber between the inner peripheral wall and the inner peripheral wall, and the air is adjusted and supplied to the air chamber. The elastic body 16a expands when air is supplied to the air chamber to shield the discharge pipe 15, and when the air is discharged from the air chamber, contracts to open the discharge pipe 15, and the elastic body 16a is connected to the air chamber. The opening amount of the discharge pipe 15 can be adjusted by adjusting the amount of supplied air. The excavated earth and sand transfer device using the pinch valve 16 has no power source for transferring the excavated earth and sand, and the excavated earth and sand in the chamber 3 is transferred into the shield body 1 by the earth pressure of the chamber 3 itself through the earth discharging pipe 15. Then, the transfer amount is adjusted by adjusting the opening amount of the pinch valve 16.

In this shield machine, the excavated sediment transporting device is constituted by the discharge pipe 15 provided with the pinch valve 16, and the internal structure of the excavated sediment transporting device has a simple pipe-like structure. Even if excavated sediment mixed with gravel is introduced into the excavated sediment transfer device, the excavated sediment is hardly clogged, and even if large excavated sand is mixed in the excavated sediment in the chamber 3, the excavated sediment can be transferred into the shield body 1 without any trouble. it can. Therefore, it is possible to excavate various types of soil with a mixture of small pebbles and large gravel from a normal ground, so that the applicable range for the soil can be expanded.

The shield excavator has a sediment pit 1 capable of storing excavated sediment transferred by the excavated sediment transfer device.
7 is provided to carry the excavated sediment accumulated in the sediment pit 17 into the mud storage chamber 7, so that the excavated sediment transferred by the earth discharging pipe 15 is transferred to the sediment pit 17 and the mud storage chamber 7.
And can be shared. Therefore, the mud storage chamber 7 can be reduced in size, and the excavated sediment stored in the mud storage chamber 7 can be discharged while the excavated sediment is being stored in the sediment pit 17 during excavation. The earth and sand can be discharged not only when the excavation is stopped but also during excavation, so that the excavation work can be performed efficiently. In addition, since the gravel separating device 18 is provided on the sediment pit 17, the gravel in the excavated sediment transferred by the excavated sediment transporting device can be separated by the gravel separating device 18 and sent to the excavated sediment carrying pipeline 8. You can also excavate in soils with gravel.

In the example shown here, the earth discharging pipe 15 forming the excavated earth and sand transferring device is attached to the front body 1a side, and the earth and sand pit 17
Is installed on the side of the rear body 1b, and a sediment pit 17 is arranged below the discharging pipe 15 so that the discharging pipe 15 and the sediment pit 1 are disposed.
7 and the shield body 1
, The rocking of the excavated sediment transporting device is not transmitted to the mud storage chamber 7 even if the excavated sediment transporting device is rocked accordingly. Therefore, the shield body 1
It is possible to prevent the swinging power from being transmitted to the mud storage chamber 7 at the time of folding in without breaking any special means.

Although not shown in FIG. 3, a screw feeder is provided to transfer the excavated sediment accumulated in the sediment pit 17 to the mud storage chamber 7, and the excavated sediment in the sediment pit 17 is passed through the screw feeder. Mud storage chamber 7
It can also be carried in. For example, a screw feeder is provided in the lower part of the earth and sand pit 17, and the excavation earth and sand carrying pipeline 8 is connected to the screw feeder,
A screw feeder is connected between the sediment pit 17 and the excavated sediment carry-in line 8 to carry the excavated sediment in the sediment pit 17 into the mud storage chamber 7. When such a method is adopted, when the excavated sediment in the sediment pit 17 is carried into the mud storage chamber 7 through the excavated sediment carry-in line 8, the vacuum pump 14 and the screw feeder cooperate to carry the excavated sediment into the mud storage chamber 7. Therefore, the accumulation of the excavated sediment in the sediment pit 17 and the clogging of the excavated sediment in the excavated sediment carrying-in pipeline 8 can be prevented.

FIGS. 1 to 3 show an example in which the excavated sediment in the mud storage chamber 7 can be sent to the ground by the water supply pump 12. The pump 12 may be configured to be able to be sent into the starting shaft. In this case, an auxiliary pump is provided in the starting shaft, so that the excavated earth and sand sent into the starting shaft can be discharged to the ground by the auxiliary pump. When such a method is employed, the excavated earth and sand in the mud storage chamber 7 is
And the auxiliary pump can be shared and sent to the ground, so that not only the capacity of the water supply pump can be reduced, but also the pressure resistance of the mud storage chamber 7 and the piping of the water supply and discharge system can be reduced.

FIGS. 1 to 3 show a mud storage chamber 7 for storing excavated earth and sand when the segment 1 ring length is excavated.
Although the example in which one was provided was shown, such a mud storage chamber 7 may be divided into two. In that case, the excavated sediment carrying-in line 8 is selectively connected to any one of the two mud storage chambers 7 so that the excavated sediment transferred by the excavated sediment transfer device can be carried in, and the water pipe 10 Is selectively connected to any one of the two mud storage chambers 7 so that the excavated sediment accumulated in the mud storage chamber 7 can be discharged by the water supply pump 12.

When the mud storage chamber 7 is divided into two parts as described above, the excavated sediment carrying pipe 8 is connected to one of the mud storage chambers 7 during the excavation of the shield machine, and the excavated sediment is stored. After closing the excavated sediment loading section of the mud chamber 7,
The excavated sediment carrying pipe 8 is connected to the other mud storage chamber 7 to store excavated sediment. During this time, the water pipe 10 is connected to the one mud storage chamber 7 so that
The excavated earth and sand in the inside is discharged by the water supply pump 12, and FIG.
Unlike the above example, the soil is excavated during excavation. When the water accumulates in the other mud storage chamber 7, the excavated sediment carrying-in portion of the other mud storage chamber 7 is closed, and a water pipe 10
Is connected, the excavated earth and sand in the other mud storage chamber 7 is continuously discharged by the water supply pump 12.

Therefore, by dividing the mud storage chamber 7 into two parts in this manner, the soil can be discharged not only when the excavation of the shield excavator is stopped but also during excavation without adversely affecting the face. Can be done As a result, the amount of soil discharged per unit time can be reduced, so that the capacity of the water pump 12 can be reduced, which contributes to the reduction of the manufacturing cost, and the size of the drainage pipe 11 can be reduced. This contributes to the expansion of the effective space in the shield body 1 and the underground mine.

[0050]

As is apparent from the above description, the present invention employs the means described in the section of "Means for Solving the Problems". Thus, a shield machine capable of efficiently transporting and discharging the segment can be obtained. As a result, when excavating over a long distance with a shield machine, the problem of the conventional technology, which requires a long time to transport the segment and discharge the excavated earth and sand, which significantly reduces the work efficiency, is solved. You.

When the present invention is embodied, particularly when embodied in claim 2, not only the capacity of the water supply pump can be reduced, but also the capacity of the mud storage chamber and the water supply and drainage system can be reduced. The pressure resistance of the pipe can also be reduced.
When the present invention is embodied, and particularly when embodied as described in claim 3, the excavated sediment transferred by the excavated sediment transfer device is shared by the sediment pit and the mud storage chamber. Because it is possible to accumulate, the mud storage chamber can be downsized, and the excavated sediment stored in the mud storage chamber can be discharged while the excavated sediment is being accumulated in the sediment pit while excavating, Excavated earth and sand can be discharged not only when the excavation is stopped but also during excavation, so that the excavation work can be performed efficiently.

When the present invention is embodied, and particularly when embodied in claim 4, the gravel in the excavated sediment transferred by the excavated sediment transfer device is separated by the gravel separating device. The excavated sediment can be sent to the excavated sediment loading pipeline, so that the shield excavator can be excavated even in soils with contaminated soil. When the present invention is embodied, and particularly when embodied as described in claim 5, when the excavated sediment accumulated in the sediment pit is carried into the mud storage chamber through the excavated sediment carrying-in conduit. , The vacuum pump and the screw feeder can cooperate to carry the excavated sediment in the sediment pit and prevent the excavated sediment from clogging in the excavated sediment carrying-in channel. . When the present invention is embodied, and particularly when embodied as described in claim 6, the internal structure of the excavated sediment transporting apparatus has a simple pipe-like structure, Even if excavated sediment mixed with excavated sediment is introduced into the excavated sediment transfer device, the excavated sediment is not clogged. Can be expanded.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state where a shield construction method is being performed by a shield machine according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a shield construction method is being performed by a shield machine according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a state where a shield construction method is being performed by a shield machine according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 1a Front trunk 1b Rear trunk 1c Bulk head 2 Cutter head 3 Chamber 4 Screw conveyor 5 Shield jack 6 Middle folding jack 7 Mud storage chamber 8 Excavation earth and sand carry-in line 9 Gate valve 10 Water pipe 11 Drain pipe 12 Water pump 13 Subsequent bogie 14 Vacuum pump 15 Discharge pipe 16 Pinch valve 17 Sediment pit 18 Screen 20 Segment assembling device 28 Segment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Go Tsuyoshi Owada 2-5-1 Koraku Bunkyo-ku, Tokyo Inside Hitachi Construction Machinery Co., Ltd. (72) Inventor Tsutomu Mizutani 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Inside the Tsuchiura Plant Co., Ltd. (72) Inventor Hitoshi Takahashi 650 Kandamachi, Tsuchiura City, Ibaraki Prefecture F-term in the Tsuchiura Plant Hitachi Construction Machinery Co., Ltd. 2D054 AC04 DA01 DA03 DA19 DA25 DA33 DA37

Claims (6)

[Claims] 1. A shield body, a cutter head provided in front of the shield body for excavating a face, and a chamber provided between the cutter head and the shield body for taking excavated earth and sand and supporting the face with earth pressure. An excavated sediment transfer device capable of transferring excavated sediment in the chamber into the shield main body and adjusting the amount of excavated sediment transferred to adjust the earth pressure of the chamber; A shield mud chamber installed in the shield main body or behind the shield main body so as to be able to move together with the shield main body, and for storing excavated sediment transferred by the excavated sediment transfer device, An excavated sediment carrying pipe for carrying the excavated sediment transferred by the transfer device into the mud storage chamber, and an open / close port for opening and closing the excavated sediment carrying pipe. Providing a closing device and connecting the mud storage chamber to a water pump installed on the ground or in a starting shaft, and using a water pump to feed water into the mud storage chamber with the excavated sediment carrying-in pipeline closed by the opening and closing device. Thereby, the excavated earth and sand in the mud storage chamber can be sent to the ground or in the starting shaft by a pipeline without providing a mud discharging relay pump in the underground mine formed by the excavation of the shield machine. Shield machine. 2. The shield excavator according to claim 1, wherein the excavated soil in the mud storage chamber is configured to be sent into the start shaft by a pipeline, and the start shaft is provided by an auxiliary pump provided in the start shaft. A shield machine capable of discharging excavated earth and sand sent into the ground to the ground. 3. The shield machine according to claim 1, wherein when the excavated sediment carrying-in conduit is provided, a sediment pit is provided for receiving and storing the excavated sediment transferred by the excavated sediment transfer device. Connect the sediment carrying pipeline to the sediment pit, and install a vacuum pump to reduce the pressure in the mud storage chamber.The excavated sediment transferred by the excavated sediment transfer device is stored in the sediment pit and then suctioned by the vacuum pump. A shield excavator wherein the excavated sediment is carried into a mud storage chamber through an excavated sediment carrying pipeline. 4. The shield machine according to claim 3, further comprising a gravel separating device provided on the earth and sand pit for separating the gravel in the excavated earth and sand. 5. The shield machine according to claim 3, wherein the excavated earth and sand accumulated in the earth and sand pit is carried into a mud storage chamber via a screw feeder. 6. The shield machine according to claim 1, wherein the excavated earth and sand transfer device is constituted by a discharge pipe provided with a pinch valve.