JP2001020681A - Cave constructing method and cave constructing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cave constructing method which is free from a fear of halting and clogging at some midpoint of a mud discharging pipe even if a cave constructing machine is used as a mud discharging device for discharging mud to the outside via the mud discharging pipe, and to provide the cave constructing machine. SOLUTION: There is provided a cave constructing method in which a power- driven excavator main body carries out excavation as a leading body and a propeller pipe is sequentially propelled from the rear of the excavator while earth pressure being supported. The cave constructing method comprises a first soil inflow step of allowing soil excavated at the front end of the excavator main body to flow into the excavator main body, a second soil inflow step of allowing the soil flowing in the first soil inflow step to flow into an agitating tank 17, and an agitating step of agitating the soil flowing into the agitating tank 17 in the second soil inflow step. After the agitation of the soil in the agitating tank, the soil is discharged to the outside via a mud discharging pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal hole construction method and a horizontal hole construction machine used when constructing a horizontal shaft such as a tunnel or constructing a sewer underground.

[0002]

2. Description of the Related Art Conventionally, for example, semi-shielding machines such as earth-pressure semi-shielding machines, mud pressurization-type semi-shielding machines and mud-concentrating semi-shielding machines, or side holes such as semi-shielding methods and propulsion methods using these machines. The construction method is widely used when constructing a horizontal shaft such as a tunnel or constructing a sewer pipe underground because of its wide applicable soil and excellent operability. Then, among the above-mentioned respective lateral hole construction methods, for example, an earth pressure type semi-shield method will be described. This method is an excavator or excavator equipped with a power driven excavator as a leading conductor, a direction correcting jack or the like. This is a method of excavating the propulsion pipe with a jack installed at the rear of the propulsion pipe inside the starting shaft while preventing the collapse of the ground by the main body, used when performing such earth pressure type semi-shield method An earth pressure type semi-shielding machine is disclosed in, for example, JP-A-57-15797, JP-A-57-74498 or JP-B-61-74498.
No. 25879. The earth pressure type semi-shielding machine described in these publications has a cutter head which is driven to rotate by a drive motor and has a plurality of bits fixed on the front, and a cutter head formed on the back side of the cutter head. And a sludge discharging device such as a screw conveyor that is formed on the back side and discharges the soil generated by excavation of the ground due to the rotational drive of the cutter head. It is discharged outside.

[0003]

Incidentally, large gravels are often mixed in the ground excavated by the lateral hole construction machine including the semi-shield machine. However, when such large gravel flows into the excavator body, there is a high risk that the large gravel will not flow into the sludge discharge device, and even if the large gravel once flows into the sludge discharge device, it will move on the way. It may be clogged without it. In this way, once the excavated material such as gravel is clogged and stopped in a sludge discharging device such as a sludge pipe, the driving of the side hole construction machine is stopped,
Since it is necessary to remove internal gravel and the like, the actual situation is that the construction period is significantly extended.

Accordingly, the present invention has been proposed to solve the above-mentioned problems of the conventional lateral hole construction machine, and is intended to discharge earth and sand to the outside using a mud pipe as a mud discharging device. Even in this case, it is an object of the present invention to provide a lateral hole construction method and a lateral hole construction machine which do not have a risk of stopping and clogging in the middle of the exhaust pipe.

[0005]

Means for Solving the Problems The present invention has been proposed to solve the above problems, and the first invention (the invention described in claim 1) relates to a lateral hole construction method. In the lateral hole construction method of excavating underground with a power driven excavator body as a leading conductor and sequentially propelling a propulsion pipe from behind the excavator body while supporting earth pressure, A first earth and sand inflow step of allowing the excavated earth and sand to flow into the excavator body, a second earth and sand inflow step of causing the earth and sand that have flowed in the first earth and sand inflow step to flow into the stirring tank, Agitating the earth and sand that has flowed into the agitation tank by the earth and sand inflow step of the above, after the earth and sand is agitated in the agitation tank, is discharged to the outside via a mud pipe. It is characterized by the following.

[0006] In the first invention, the earth and sand excavated by the excavator body flows into the excavator body, and then flows into the stirring tank. Then, the earth and sand stirred in the stirring tank becomes earth and sand, and thereafter, is discharged to the outside via a drain pipe. Therefore, the sediment flowing into the sludge pipe, the relatively large gravel is also finely divided into the sludge pipe by the stirring step in the stirring tank, and flows into the sludge pipe. It can be effectively avoided.

Further, the second invention (the invention according to claim 2)
In the first aspect of the present invention, a mud material is injected into the stirring tank, the mud material and earth and sand are stirred in the stirring tank to form mud, and then discharged to the outside through a drain pipe. It is characterized by having such a configuration.

According to the second aspect of the present invention, the earth and sand and the mud material are agitated in the stirring tank, and the earth and sand and the mud material flow together into the drain pipe. Therefore, the clogging of the drainage pipe can be further prevented as compared with the first aspect.

The third invention (the invention according to claim 3)
Is characterized in that, in the first or second invention, a step of injecting a mud material into the earth and sand which has flowed into the excavator body in the first earth and sand inflow step is characterized in that .

According to the third aspect of the present invention, the mud material is injected into the earth and sand that has flowed into the excavator body and then stirred in the stirring tank, or Since the mud material is injected and the mud material is further injected even in the stirring tank, the composition fluid is improved and the mud soil is further prevented from being clogged in the drain pipe. It becomes possible.

The fourth invention (the invention according to claim 4)
The present invention relates to a horizontal hole construction machine, and has an excavator body formed at its tip with a cutter head that is rotated by driving means and excavates earth and sand, and is formed in the excavator body and excavated by the cutter head. A sediment inflow space into which the sediment flows, a stirring tank formed in the excavator main body, provided behind the sediment inflow space, and communicating with the sediment inflow space, and a stirring tank disposed in the stirring tank. A stirrer that stirs the earth and sand that has flowed into the tank by a drive motor, and a mud discharge pipe that discharges the earth and sand stirred in the stirring tank to the outside, and the earth and sand excavated by the cutter head is fed into the stirring tank. And then discharged to the outside through a mud pipe after being stirred.

[0012] In the fourth invention, the earth and sand excavated by the cutter head first flows into the earth and sand inflow space,
After that, it flows into the stirring tank, and is stirred by the stirring blade driven by the drive motor in the stirring tank, so that the earth and sand is turned into mud and then discharged to the outside via a drain pipe. Therefore, the mud flowing into the mud pipe is
Since the air is further reduced in the stirring tank and flows into the exhaust pipe, the danger of stopping and clogging in the exhaust pipe can be effectively avoided as in the first invention.

A fifth invention (an invention according to claim 5)
In the fourth aspect of the present invention, the driving means for driving the cutter head is a driving motor for driving the stirring blade.

In the fifth aspect, the driving means for driving the cutter head is the same as the driving motor for driving the stirring blade, and the driving motor for the stirring blade is not the same as the cutter head. In addition, the configuration inside the excavator body is simplified, and the cutter head and the stirring blade are the same due to the configuration of the gear that connects the drive motor and the cutter head and the gear that connects the drive motor and the stirring blade. , And different rotation speeds.

The sixth invention (the invention according to claim 6)
In the invention described in the fourth or fifth aspect, in the stirring tank, a mud material inflow port for injecting a mud material into the stirring tank is formed, and the earth and sand and the mud material are filled in the stirring tank. It is characterized in that it is configured to be discharged to the outside from a drain pipe in a kneaded state.

According to the sixth aspect of the present invention, the mud material is injected into the stirring tank from the mud material inflow port, and the mud material and the earth and sand are agitated in the stirring tank, and then are passed through the drain pipe. Therefore, as in the second aspect, it is possible to further prevent clogging of the exhaust pipe.

The seventh invention (the invention according to claim 7)
According to the fourth, fifth or sixth aspect of the present invention, there is provided a mud material injection port for injecting a mud material into a mud inflow space formed behind the cutter head. Things.

According to the seventh aspect of the invention, after the mud material is injected into the sediment inflow space formed behind the cutter head, it is stirred in the stirring tank, or is added to the sediment inflow space. After the mud is injected, the mud is also injected into the stirring tank, so that it is possible to further prevent clogging of the exhaust pipe.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a lateral hole construction machine according to an embodiment of the present invention and a lateral hole construction method using the lateral hole construction machine will be described in detail with reference to the drawings. The horizontal hole construction machine described below is an application of the present invention to a mud-type semi-shield machine.

An earth pressure type semi-shielding machine 1 (hereinafter, referred to as a semi-shielding machine) according to this embodiment is provided at the tip of a cylindrical propulsion pipe (not shown) and is shown in FIG. As shown in the figure, a rear shield cylinder 2, a front shield cylinder 3 fixed to the tip of the rear shield cylinder 2, an outer cone 4 fixed to a tip of the front shield cylinder 3, and an outer cone 4 And an inner cone 5 rotatably disposed inside the inner cone 5 and a cutter head 6 fixed to a tip of the inner cone 5. In addition, the cutter head 6 to the rear shield cylinder 2 are an excavator body constituting the present invention.

The cutter head 6 is fixed to the tip of a drive shaft 8 connected to a drive motor described later, and a number of cutter bits 7 are fixed to the tip (front). The semi-shield machine 1 excavates underground with these cutter bits 7. In addition, on the back surface of the cutter head 6, a back side bit 6a is formed. Openings (not shown) are formed in the cutter head 6, and earth and sand excavated by the cutter bit 7 pass through the openings from the back side of the cutter head 6, that is, the outer cone 4 and the inner cone 5.
Flowed in between. The back side of the cutter head 6 is a sediment inflow space constituting the present invention. The outer diameter of the outer cone 4 is the same as the diameter of the front shield tube 3, and the inner peripheral surface is gradually reduced in diameter from the front end to the rear end. Have been. The inner cone 5 is fixed to the front end of the drive shaft 8 at the center position, and has a gradually increasing diameter from the front end to the rear end. Therefore, the earth and sand flowing between the outer cone 4 and the inner cone 5 from the opening formed in the cutter head 6 flows while the outer cone 4 and the inner cone 5 are gradually narrowed. A large number of projections 4a, 5a are formed on the inner peripheral surface of the outer cone 4 and the outer peripheral surface of the inner cone 5, respectively. If large gravel is included, it is finely divided.

The earth and sand that has passed between the outer cone 4 and the inner cone 5 is
Flows into. The base end of the drive shaft 8 is supported by a bearing 9 at the center of the inside of the front shield tube 3. The bearing 9 is formed from the inner periphery of the front shield tube 3 toward the center. 1st and 2nd disk part 10,1
1 supported. The first disk portion 10 is formed at a front-end portion of the front shield tube 3, and the second disk portion 11 is formed at a rear-end portion of the front shield tube 3. Then, these first and second disk portions 1
Each of 0 and 11 has two circular openings (not shown). Therefore, the outer cone 4
The earth and sand passing between the inner cone 5 and the inner cone 5 moves to the rear of the semi-shield machine 1 through these openings.

In the front shield tube 3,
Behind the second disk portion 11, a stirring tank 12 constituting the present invention is formed. The stirring tank 12 includes a back surface of the second disk portion 11, an inner peripheral surface of the front shield tube 3, and a partition 13 that partitions a rear end of the front shield tube 3 and a front end side of the rear shield tube 2. This is a closed site. A stirring device 14 is provided in the stirring tank 12. The stirring device 14 includes a rotating member 16 fixed at the center to a base end of the driving shaft 8 and a distal end of a speed reducer 15 connected to the driving shaft 8, and a stirring member formed on the outer periphery of the rotating member 16. And the blades 17. Therefore, the earth and sand flowing into the stirring tank 12 from the two openings formed in the second disk portion 11 is rotated by the rotation driving force of a drive motor described later, and the stirring device 14 is rotated. The mud is further refined and simultaneously plasticized.

The partition 13 is formed with two openings (not shown), and the tip of the drainage pipe 18 is fixed to these openings. As shown in FIG. 2, this mud drain pipe 18 has a branch pipe 18a connected to two openings formed in the partition wall 13, and a rear end side to which these branch pipes 18a are connected, And a sludge pipe main body 18b installed up to the end. In addition, as shown in FIG. 2, a pinch valve 19 is disposed on the tip end side of the main body 18b. A drive motor 20 is disposed in the rear shield cylinder 2 and behind the partition 13 as shown in FIG. 1, and the speed reducer 15 is disposed at an end of the drive motor 20. The drive shaft 8 is fixed to the speed reducer 15. Also, in the rear shield cylinder 2, three direction correcting jacks 2 are provided.
1, 22, 23 (see FIG. 3) are provided. In addition,
A propulsion jack (not shown) is provided behind the semi-shield machine 1, and the thrust of the propulsion jack includes the semi-shield machine 1 and a shield tube (not shown) following the semi-shield machine 1. The whole is configured to propel while correcting in a direction designed in advance by the direction correcting jacks 21, 22, and 23.

Therefore, in the semi-shield machine 1 according to this embodiment, the cutter head 6 is rotated by the rotational driving force of the drive motor 18, and the cutter bit 7 excavates underground by the rotation of the cutter head 6. The excavated earth and sand passes through the opening formed in the cutter head 6 and flows between the outer cone 4 and the inner cone 5.
, And flows into the front shield tube 3 and further flows into the stirring tank 12. In the stirring tank 12, a stirring blade 17 constituting the stirring device 14 is provided.
After that, the air flows into the branch pipe main body 18b from the branch pipe 18a and flows out to the outside.

Further, in the semi-shielding machine 1 according to the present embodiment, as shown in FIG. 4, a mud material injection passage 25 is formed. The humidification material injection path 25 includes a main pipe 26 having a base end connected to a humidification material injection device (not shown) provided on the ground, and a flow divider 27 provided at a distal end of the main tubing 26. A first branch pipe 28 having a base end connected to the flow divider 27 and a distal end communicating with the stirring tank 12, and a base end connected to the flow divider 27 and a distal end The second branch pipe 29 communicates with the inner peripheral surface of the outer cone 4. The tip of the first branch pipe 28 is inserted into a first muddy material inflow port 13 a formed in the partition wall 13, and the second branch pipe 29 is connected to the front of the rear shield tube 2 from the inside. It passes through the inside of the shield cylinder 3 and is inserted into a second mud material inflow port 4b formed from the back surface of the outer cone 4 to the inner peripheral surface.

Therefore, in the semi-shielding machine 1 according to this embodiment, the earth and sand flows between the outer cone 4 and the inner cone 5 through the opening formed in the cutter head 6, and At the point of time when the cone 5 is made finer by rotation, it is mixed with the mud material flowing from the second mud material inflow port 4b (first mud material injecting step). In the state where the humidified material flowing from the first humidified material inflow port 13a is agitated (the second humidified material injecting step), it flows from the inside of the branched pipe 18a into the branched pipe main body 18b to be externally stirred. Spilled to. Therefore, according to the semi-shielding machine 1, clogging in the drainage pipe 17 can be further prevented by the first and second mud material injection steps.

In the above embodiment, the present invention is applied to a mud type semi-shield machine.
The present invention may be applied to a muddy pressurized semi-shield machine or an earth pressure semi-shield machine.

In the semi-shielding machine 1 according to the above embodiment, the cutter head 6 formed at the tip is
Although the semi-shielding machine 1 of the type in which a large number of cutter bits 7 are fixed and the ground is excavated with these cutter bits 7 is illustrated and described, the cutter head according to the present invention is not necessarily such a type of cutter head. There is no necessity. For example, a roller bit (not shown) may be rotatably provided, and the roller bit may be configured to excavate underground.

[0030]

As is clear from the above description of the embodiment of the present invention, in the present invention (the invention according to claim 1), the earth and sand excavated by the excavator main body is stored in the excavator main body. After flowing, it flows into the stirring tank. And
The mud stirred in the stirring tank is then discharged to the outside via a drain pipe. Therefore, since the mud flowing into the mud pipe is made into relatively large gravel by the stirring process in the stirring tank and then flows into the mud pipe, there is a danger that the mud is stopped and clogged in the mud pipe. It can be effectively avoided. As a result, it is not necessary to stop the driving of the horizontal hole construction machine due to the clogging of the drainage pipe and remove the internal gravel and the like as in the conventional case, and it is possible to effectively prevent the construction period from being extended.

The second invention (the invention according to claim 2)
According to the method, the mud and the mud material are agitated in the stirring tank, and the mud and the mud material flow integrally into the mud drain pipe. It is possible to prevent clogging of the exhaust pipe.

The third invention (the invention according to claim 3)
According to the, the muddy material is injected into the earth and sand that has flowed into the excavator body, and then stirred in the stirring tank, or the muddy material is injected into the earth and sand that has flowed into the excavator body, Since the mud material is also injected into the stirring tank, it is possible to further prevent the mud from being clogged in the drainage pipe.

Further, the fourth invention (the invention according to claim 4)
Then, the earth and sand excavated by the cutter head
It flows into the sediment inflow space, then flows into the stirring tank,
And in this stirring tank, it is stirred by the stirring blade driven by the drive motor, and the mud is thereafter discharged to the outside via a drain pipe. Therefore, the mud flowing into the drain pipe is made fine and plastic fluidized in the stirring tank and flows into the drain pipe, so that the mud stops and clogs in the drain pipe as in the first invention. And the like can be effectively avoided.

Further, the fifth invention (the invention according to claim 5)
Then, the driving means for driving the cutter head is the same as the driving motor for driving the stirring blade, and the driving motor for the stirring blade is not the same as the cutter head. In addition to being simplified, the cutter head and the stirring blade can have the same rotation speed by the configuration of the gear that connects the drive motor and the cutter head and the gear that connects the drive motor and the stirring blade. At the same time, it is possible to set different rotation speeds.

The sixth invention (the invention according to claim 6)
According to the mud material is injected into the stirring tank from the mud material inflow port, and after the mud material and the earth and sand are stirred in the stirring tank,
Since the air is discharged to the outside via the exhaust pipe, the clogging of the exhaust pipe can be further prevented as in the second aspect.

The seventh invention (the invention according to claim 7)
According to, after the mud material was injected into the sediment inflow space formed behind the cutter head, it was stirred in the stirring tank, or the mud material was injected into the sediment inflow space. Since the mud material is further injected into the stirring tank later, it is possible to further prevent clogging of the drainage pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a tip side of a muddy semi-shield according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a rear end side of the muddy semi-shield according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an arrangement position of a drainage pipe.

FIG. 4 is a sectional view showing a configuration of a mud material injection path.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mud-type semi-shielding machine 2 Rear shield cylinder 3 Front shield cylinder 6 Cutter head 12 Stirrer tank 17 Stirrer blade 18 Drainage pipe 20 Drive motor 25 Mud material injection path 28 First branch pipe 29 Second branch pipe Road

Claims (7)

[Claims] 1. A lateral hole construction method for excavating underground by an excavator body driven by power as a leading conductor and sequentially propelling a propulsion pipe from behind the excavator body while preventing collapse of the ground. A first sediment inflow step in which the sediment excavated at the tip of the excavator body flows into the excavator body, and a second sediment inflow in which the sediment flowing in the first sediment inflow step flows into the stirring tank. And a stirring step of stirring the earth and sand that has flowed into the stirring tank in the second earth and sand inflow step. After the earth and sand is stirred in the stirring tank, the earth and sand is discharged to the outside through a mud pipe. Side hole construction method characterized by being constituted as follows. 2. A method in which a mud material is injected into the stirring tank, the mud material and earth and sand are stirred in the stirring tank, and then discharged to the outside via a drain pipe. The method for constructing a lateral hole according to claim 1, wherein: 3. The side hole construction method according to claim 1, further comprising a step of injecting a mud material into the earth and sand that has flowed into the excavator body in the first earth and sand inflow step. . 4. An excavator main body having a cutter head formed at the tip thereof for excavating the earth and sand rotated by a driving means, and a sediment inflow into which the earth and sand excavated by the cutter head formed in the excavator main body flow. A space, an agitation tank formed in the excavator body and provided in communication with the sediment inflow space provided behind the sediment inflow space, and a sediment disposed in the agitation tank and flowing into the agitation tank. A stirring blade for stirring by a drive motor, and a mud discharge pipe for discharging earth and sand stirred in the stirring tank, and after the earth and sand excavated by the cutter head is stirred in the stirring tank, A side hole construction machine configured to be discharged to the outside via a mud pipe. 5. The horizontal hole construction machine according to claim 4, wherein the driving means for driving the cutter head is a driving motor for driving the stirring blade. 6. The agitation tank is formed with a humidification material inflow port for injecting a humidification material into the agitation tank, and the inside of the agitation tank is provided with a mud discharge pipe in a state where earth and sand are mixed with the agitation material. The side hole construction machine according to claim 4, wherein the side hole construction machine is configured to be discharged from the outside. 7. The side hole according to claim 4, wherein a mud material injection port for injecting a mud material into a sediment inflow space formed behind the cutter head is provided. Construction machine.