JP3335535B2 - Shield excavator and muddy shield construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator and a muddy shield construction method, and more particularly, to a shield excavator for excavating a tunnel having a deformed section while using muddy water to oppose earth pressure and a shield excavator. It relates to the muddy water shield method used.

[0002]

2. Description of the Related Art In general,
In a muddy shield construction method for constructing tunnels such as railways and underpasses, it is fundamental to excavate a tunnel having a circular cross section.

A shield excavator used for such excavation includes a shield excavator body having a circular cross section, and a shield chamber is defined between the shield excavator body and a disk-shaped cutter provided at the tip of the shield excavator body. You.

[0004] When a tunnel having a circular cross section is excavated by a shield excavator having a circular cross section as described above, the advantage of the tunnel cross section is low. Specifically, for example, when excavating a subway, an underground road, a common ditch, or the like, an unnecessary portion occurs in the excavated circular tunnel cross section.

[0005] Therefore, in order to enhance the advantage of the tunnel cross section, a shield excavator for excavating tunnels having various deformed cross sections close to a target cross section has been used. As a shield excavator that excavates tunnels with this irregular cross section,
For example, a shield excavator for excavating a tunnel having a rectangular cross section includes a shield excavator body having a rectangular cross section, and a drum-shaped drum cutter is provided at a distal end portion of the shield excavator body.

When a tunnel is excavated by this shield excavator, in the case of the muddy water shield method, a mud outlet connected to a mud pipe is formed above a center line of a rectangular partition wall, and the mud outlet is provided in the shield excavator body. The pressurized muddy water is supplied into the shield chamber from one mud feed pipe to fill the shield chamber, and the excavated earth and sand is taken into the muddy water.

[0007] The drum cutters are usually provided in pairs on the upper and lower sides. Two ring cutters are provided between the pair of drum cutters. The drum cutter and the ring cutter are provided with a plurality of cutter bits at predetermined intervals, and a tunnel is excavated by rotating the drum cutter and the ring cutter and moving the cutter bits.

During excavation, earth and sand adhere to the drum cutter and the ring cutter, and the excavation efficiency is reduced. Specifically, excavated earth and sand adhere to a plurality of cutter bits provided on the drum cutter and the ring cutter, so that excavation becomes difficult.

The higher the viscosity of the earth and sand, the more easily the earth and sand adhere to the cutter bit, so that the excavation efficiency is further reduced.

A drain port connected to a drain pipe is formed below the center line of the rectangular partition wall, and the excavated earth and sand is transported from one drain pipe through the drain port as fluid. It is supposed to.

In order to discharge the excavated earth and sand more reliably, the muddy water in the shield chamber is agitated by using an agitator or the like to prevent the occurrence of the accumulation of earth and sand.

When a tunnel having a circular cross section is excavated by a shield excavator having a circular cross section, for example, the excavated soil is concentrated at the lower center of the shield chamber. It is possible to take in the excavated earth and sand almost surely from the mouth and discharge it through the mud pipe.

However, when excavating a tunnel with a rectangular cross section, unlike the case of excavating a tunnel with a circular cross section,
The excavated earth and sand are difficult to concentrate near the center of the lower part in the shield chamber of the shield excavator having a rectangular cross section.

An object of the present invention is to provide a shield excavator capable of efficiently removing earth and sand adhering to a cutter, and a muddy water shield method using the shield excavator.

Another object of the present invention is to provide a shield excavator for excavating a tunnel having a rectangular cross section which can prevent the formation of sediment in a shield chamber of a shield excavator, and a muddy water shield method using the shield excavator. Is to provide.

[0016]

[0017]

[0018]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The invention of Claim 1 includes a shield chamber formed between the drum cutter disposed at the distal end of the shield excavating machine body and said shield excavating machine body of the partition wall, feeding of the shield excavating machine body A shield excavator that supplies muddy water from a mud pipe to excavate while opposing earth pressure, comprising: a branch pipe for washing the drum cutter branched from the mud pipe to the drum cutter; Is arranged so that muddy water can be sprayed from inside the gear case toward the surface of the drum cutter in the shield chamber through a gear case for transmitting a driving force to the drum cutter. .

According to the present invention, the drum cutter in the shield chamber is cleaned by supplying muddy water from the drum cutter cleaning branch pipe provided inside the gear case. Here, when the tunnel is excavated, the drum cutter is rotated, so that the entire drum cutter is sequentially washed,
Sediment attached to the cutter bit provided on the entire drum cutter can be removed. Thereby, the excavation efficiency by the shield excavator can be increased.

Further, since the muddy water is supplied to the drum cutter from the branch pipe, the muddy water flow can be set over the entire area in the shield chamber by the rotation of the drum cutter, and the muddy water in the shield chamber is formed. Occurrence can be prevented.

According to a second aspect of the present invention, in the shield excavator according to the first aspect , at least one pair of the drum cutters is provided, and a ring cutter is disposed between the pair of the drum cutters. Having a branch pipe for washing the ring cutter branched from the pipe to the ring cutter,
The branch pipe is attached along the gear case, and is arranged toward the surface of the ring cutter.

According to the present invention, the surface of the ring cutter in the shield chamber is cleaned by supplying muddy water from the branch pipe for cleaning the ring cutter provided in the gear case. Here, when the tunnel is excavated, the ring cutter is rotated, so that the entire ring cutter can be sequentially washed to remove earth and sand attached to the cutter bit provided on the entire ring cutter. Thereby, the excavation efficiency by the shield excavator can be further improved.

Further, since the muddy water is supplied from the branch pipe to each of the plurality of drum cutters, the muddy water flow path can be set over the entire area of the shield chamber, and the occurrence of sediment accumulation in the seal chamber can be prevented. .

Further, since the muddy water is supplied from the branch pipe to each of the plurality of ring cutters, the muddy water flow path can be set over the entire area of the shield chamber, and the occurrence of sediment accumulation in the seal chamber can be further reduced. It can be further prevented.

[0025] The invention of claim 3 is claim 1 or claim 1.
3. In the shield excavator according to 2 , the total cross-sectional area of the branch pipe and the cross-sectional area of the mud pipe are configured to be equal, and the total supply amount of mud from the branch pipe is maintained at the mud pressure in the shield chamber. The supply amount is sufficient to satisfy the supply amount of mud for use.

According to the present invention, supplied from a mud pipe,
The muddy water for maintaining the muddy water pressure in the shield chamber is branched, and the muddy water for cleaning supplied to the drum cutter and the ring cutter is also used as the muddy water for maintaining the muddy water pressure. Muddy water for cleaning can be supplied with an inexpensive configuration using existing equipment without using any special equipment. Therefore, it is possible to maintain a sufficient muddy water pressure together with a sufficient cleaning action.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In the shielded excavator according to any one of the above, a plurality of mud holes are formed at a lower portion of the bulkhead, and the plurality of mud holes are switched by a switching valve to form different mud channels in the shield chamber. It is provided at a possible position.

According to the present invention, different muds outlets in the shield chamber form mud channels in accordance with the excavation conditions and the like, and the mud for cleaning is switched into a plurality of muds and flows in. It is possible to prevent the accumulation of sediment at the lower portion in the shield chamber.

According to a fifth aspect of the present invention, a shield chamber formed between a drum cutter disposed at the tip of the shield excavator main body and a partition wall of the shield excavator main body includes a shield chamber inside the shield excavator main body. In a muddy shield construction method in which mud is supplied from a mud pipe to excavate while opposing earth pressure, the drum cutter branched from the mud pipe to the drum cutter and disposed inside the drum cutter A pressurized muddy water is supplied from a washing branch pipe toward the surface of the drum cutter in the shield chamber to maintain the muddy water pressure in the shield chamber.

According to the present invention, since the pressurized mud supplied from the mud feed pipe is also used as the mud for washing the drum cutter, the mud pressure in the shield chamber is maintained, and
Sufficient cleaning of the drum cutter can be performed.

According to a sixth aspect of the present invention, in the muddy water shield method according to the fifth aspect , the mud pipe is branched into at least a pair of ring cutters disposed between the pair of drum cutters. Supplying pressurized muddy water from the branch pipe for washing the ring cutter disposed outside the ring cutter toward the surface of the ring cutter in the shield chamber to maintain the muddy water pressure in the shield chamber. I do.

According to the present invention, since the pressurized mud supplied from the mud pipe is also used as the mud for washing the ring cutter, the mud pressure in the shield chamber is maintained,
Sufficient cleaning of the ring cutter can be performed.

[0033] The invention of claim 7 is based on claims 5 and 6.
In the muddy water shield construction method according to any one of the above, from the branch pipe, from the start of digging for one ring of a segment formed in the rear part of the shield excavator main body to the start of digging for one ring of the next segment continuously. And supplying the pressurized muddy water.

According to the present invention, since the muddy water is continuously supplied not only during the excavation but also during the excavation is stopped, that is, during the assembling operation of the segments, the muddy water pressure in the shield chamber is constantly maintained, and the face is stabilized. Can be achieved.

The invention of claim 8, the shield chamber formed between the drum cutter and ring cutter which is arranged at the distal end of the shield excavating machine body and said shield excavating machine body of the partition wall, the shield excavator In a muddy shield construction method in which mud is supplied from a mud pipe in the main body to excavate while opposing earth pressure, the mud pipe and the mud pipe are branched to the drum cutter, and the A branch pipe for cleaning the drum cutter disposed therein; and a branch pipe for cleaning the ring cutter, wherein the mud feeding pipe is branched to the ring cutter and disposed outside the ring cutter. And supplying the pressurized muddy water by any one or more of the above, and maintaining the muddy water pressure in the shield chamber.

According to the present invention, the drum cutter and the ring cutter can be cleaned using the branch pipe of the drum cutter and the branch pipe of the ring cutter, respectively.

In this case, since the pressurized muddy water is supplied by one or more of the mud feed pipes or the branch pipes, the muddy water pressure in the shield chamber can be maintained. For example, during excavation, pressurized mud is supplied only from the mud feeding pipe to maintain the mud pressure, and washing is appropriately performed using each branch pipe. By supplying the pressurized muddy water from the pipe and the branch pipe for cleaning the ring cutter, the muddy water pressure in the shield chamber can be constantly maintained.

[0038]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of a rectangular shield excavator according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of the rectangular shield excavator shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of a shield chamber of the rectangular shield excavator shown in FIG. 4, and FIG. 4 is a diagram for explaining a muddy water shield construction method using the rectangular shield excavator shown in FIG.

This rectangular shield excavator is a so-called box shield machine, and a shield chamber provided between the partition wall 24 at the tip of the rectangular shield excavator body 10 and the cutter 12 for excavating a tunnel having a rectangular cross section. The muddy water is supplied from the mud feed pipe 200 into the
The mud is drained from 0 to maintain the inside of the shield chamber 20 at a predetermined mud pressure, and the mud is used to excavate while opposing the earth pressure.

The cutter 12 is composed of two upper and lower cutter units 40. Each cutter unit 40
Has two drum cutters 42 arranged on both left and right sides,
The upper and lower ring cutters 44 are provided between the drum cutters 42.

The shield excavator main body 10 includes a front trunk 100
It is of a middle-bend type formed by the front body part 100 and the rear body part 110. The middle body-bending jack 31 bends the front body part 100 to enable curved construction.

In the front body 100, four cutter driving motors 36 are provided. The cutter driving motor 36 is connected to the drum cutter 42 and the ring cutter 44 via a plurality of gears (not shown) in a gear case 38 that penetrates the partition wall 24 at the front end of the front body portion 100. The drum cutter 42 and the ring cutter 44 are rotationally driven by the electric motor 36.

The drum cutter 42 is rotated about a shaft 46 connected to gears in the gear case 38, and the ring cutter 44 is rotated about a shaft 48 connected to gears in the gear case 38.

A hood 18 projects from the front end of the front body 100, and the hood 18 allows the front body 10 to protrude.
A shield chamber 20 is defined between the cutter 12 and the partition wall 24 at the leading end of the zero.

The rear body 110 is provided with an erector 32 for assembling the segment 14 therein.
Are operated by the hydraulic motor 34 for turning the erector.

Further, in the shield excavator body 10,
A plurality of shield jacks 30 are provided, and these shield jacks 30 are brought into contact with the tips of the segments 14 in the rear body 110 to propell the shield excavator body 10 to excavate a tunnel.

In this tunnel excavation, first, excavation is performed for one ring of the segment 14, and then the rear trunk 11
Within 0, the arranged erector 32 is operated by the erector turning hydraulic motor 34 to assemble the segment 14. The space between the rear trunk portion 110 and the segment 14 is sealed by the tail seal 16.

Further, the partition 2 in the shield chamber 20
4 is provided with a mud port 26 at the upper center on the center line. The mud port 26 is connected to a mud pipe 200 disposed in the shield excavator body 10.

The mud feeding pipe 200 is connected to an adjusting tank 330 installed on the ground, and sends out muddy water from the adjusting tank 330. Further, the mud feeding pipe 220 is provided with a mud feeding pump 306.
And the shield chamber 20 are branched into a mud pipe 200a and a mud pipe 200b. These branch pipes 20
0a and 200b have switching valves 302 and 30 respectively.
4 are provided.

In the shield excavator main body 10, there is provided a mud pipe 210 in which a mud pipe 200 is branched at a predetermined position. The mud pipe 210 is provided with a switching valve 332, a sand pump 334, and a switching valve 336 sequentially from the adjustment tank 330 side. Opening and closing of the branch pipe 210 is switched by the switching valve 332, and the sand pump 3
34, the mud amount is appropriately adjusted.
The opening and closing of the branch pipe 210 is switched.

The mud feeding pipe 210 is connected to the shield chamber 2
The 0 side is further branched, and branch pipes 220 and 230 for cleaning the drum cutter 42 and branch pipes 240 and 250 for cleaning the ring cutter 44 are provided.

Further, the branch pipe 220 includes a branch pipe 221a,
221b, the branch pipe 230 is divided into branch pipes 231a and 231b.
The branch pipe 240 is branched into branch pipes 241a and 241b, and the branch pipe 250 is branched into branch pipes 251a and 251b.

Branch pipes 221a, 221b, 231a, 2
The reference numerals 31 b pass through the corresponding gear case 38 and are disposed toward the respective drum cutters 42 in the shield chamber 20.

The branch pipes 241a, 241b, 251
a and 251b are disposed from the outside of each ring cutter 44 to the surface of each ring cutter 44 in the shield chamber 20 through the corresponding gear case 38, respectively.

Each branch pipe 220, 230, 240, 2
The switching valve 3 is provided between the shield chamber 20 and the shield chamber 20.
42, 344, 346, and 348 are provided, respectively, and the branch pipes 220, 230, 240, and 25 are switched by opening and closing the switching valves 342, 344, 346, and 348, respectively.
Switch to 0 to supply muddy water.

Specifically, the branch pipes 221a and 221b provided for the two drum cutters 42 in the upper cutter unit 40a will be described.

As shown in FIG. 1, the branch pipes 221a and 221b where the branch pipe 220 is branched at a predetermined position (not shown) in the shield excavator body 10 are respectively passed through the partition wall 24, and further the gear case 38. After passing through the inside of the drum cutter 42, it is disposed in the gear case 38 inside the drum cutter 42. At this time, the distal end portion 22 of the branch pipes 221a and 221b
The reference numerals 2a and 222b are disposed so as to face the drum cutter 42 in the shield chamber 20.

The branch pipes 221a, 221 and 2
By supplying muddy water to the two drum cutters 42 in the upper cutter unit 40a from the tips 222a, 222b of the 21b, the two drum cutters 42 are washed. Thereby, two drum cutters 4
The earth and sand adhering to the plurality of cutter bits 50 provided in each of the cutter bits 2 are removed.

Similarly, the lower cutter unit 40b
In the two drum cutters 42, the branch pipe 231 is also provided.
a and 231b are arranged in the gear case 38 inside the drum cutter 42 such that their tips face the surface of the drum cutter 42, respectively. These branch pipes 23
By supplying muddy water to the drum cutters 42 from the tip portions 1a and 231b, sediment attached to the plurality of cutter bits 50 provided on the two drum cutters 42 in the lower cutter unit 40b is removed. Is done.

Next, the 2 in the lower cutter unit 40b
The branch pipes 251a and 251b provided for each of the ring cutters 44 will be described.

As shown in FIG. 1, the branch pipe 250 is branched at a predetermined position in the shield chamber 20.
1a and 251b are arranged outside the ring cutter 44. At this time, the distal ends 252a and 252b of the branch pipes 251a and 251b are disposed so as to face the surface of the ring cutter 44 in the shield chamber 20.
This is because, in the ring cutter 44, the branch pipe 251
Since a and 251b cannot be inserted into the inside, muddy water for cleaning is ejected from the outside.

The branch pipes 251a, 2
The two ring cutters 44 are washed by supplying muddy water from the tip portions 252a and 252b of the 51b to the two ring cutters 42 in the lower cutter unit 40b, respectively. Thereby, two ring cutters 4
The earth and sand attached to the plurality of cutter bits 50 provided in each of the cutter bits 4 are removed.

Similarly, the upper cutter unit 40a
Also in the two ring cutters 44, the branch pipe 241
a and 241b are arranged outside the ring cutter 44 such that their tips face the surface of the ring cutter 44, respectively. By supplying muddy water to the ring cutters 44 from the branch pipes 241a and 241b, sediment attached to the plurality of cutter bits 50 provided on the two ring cutters 44 in the upper cutter unit 40a is removed. Is done.

The partition 24 in the shield chamber 20
At both lower ends, two mud collecting plates 90a and 90b having an appropriate inclination are provided, respectively.

The partition 2 in the shield chamber 20
4, two mud collecting plates 90a, 90
At a position closer to the center line of the partition wall 24 than the arrangement position of b,
Three drain holes 28a, 28b, 28c are provided.

Further, agitators 60a and 60b for agitating the earth and sand are disposed between the mud holes 28a and 28b and between the mud holes 28a and 28c, respectively.

The three mud outlets 28a, 28b, 28c are:
Three branch pipes 4 arranged in the shield excavator body 10
10a, 410b, and 410c, respectively. Further, three branch pipes 410a, 410b, 410
c is a drainage pipe 4 disposed in the shield excavator body 10.
00 are connected by a branch 70 provided at a predetermined position. In addition, each branch pipe 410a, 410b, 410c
Switching valves 320a, 320b, 320c are provided between the mud holes 28a, 28b, 28c and the branch portion 70, respectively.

These switching valves 320a, 320b,
The switch 320c is automatically or manually switched. The switching valves 320a,
By switching between 20b and 320c, different muddy water passages can be formed between the mud port and the mud port.

The mud pipe 400 is provided with mud pumps 310 and 312 for discharging mud, and the mud pipe 400 is connected to a mud treatment plant (not shown) provided on the ground. It is connected to the.

Next, a muddy water shield construction method using the above-described rectangular shield excavator will be described.

First, earth and sand, water, and the like are mixed at an appropriate ratio in an adjustment tank 330 provided on the ground to generate muddy water. The muddy water is supplied to a mud pipe 200 by a mud pump 308.
Sent to

In the mud pipe 200, the switching valves 302, 3
By opening and closing 04, the muddy pipes 200a and 200b are appropriately switched, muddy water is supplied into the shield chamber 20 via the mud hole 26, and the shield chamber 20 is filled.
Maintain a predetermined mud pressure and stabilize the face.

As described above, the pressurized mud which is sent out for cleaning the drum cutter 42 and the ring cutter 44 in the shield chamber 20 is also used as the mud for maintaining the mud pressure in the shield chamber 20.

On the other hand, the muddy water through the mud pipe 210 is also sent out to the shield chamber 20 side, and is used as muddy water for cleaning the drum cutter 42 and the ring cutter 44.

At this time, switching valves 342, 344, 346, and 348 provided in each of the branch pipes 220, 230, 240, and 250 from which the mud feeding pipe 210 is branched are switched to provide a desired cleaning branch pipe. Muddy water.

Note that the branch pipe 220 is a branch pipe 221a, 22
1b, the branch pipe 230 is connected to the branch pipes 231a and 231b,
The branch pipe 240 is connected to the branch pipes 241a and 241b.
50 is further branched into branch pipes 251a and 251b, so that branch pipes 220, 230, 240 and
The muddy water is supplied from the branch pipe connected to the branch pipe selected and switched among the 50 pipes. Thus, each drum cutter 42 and each ring cutter 44 are cleaned.

Here, for example, each of the branch pipes 220 and 23
By making the total amount of muddy water supplied from 0, 240, and 250 about 3/10 of the amount of muddy water supplied from the mud pipe 210, the drum cutter 42 and the ring cutter 44 can be optimally cleaned. .

The washing mud is also used as the mud for maintaining the mud pressure in the shield chamber 20. Therefore, the drum cutter 42 and the ring cutter 44
The number of branch pipes is set so that the value of the total cross-sectional area of each branch pipe corresponding to the above becomes equal to the value of the cross-sectional area of the mud feed port 26. For example, when the inside diameter of the mud port 26 is about 20 cm and the inside diameter of each branch pipe is about 5 cm, a total of 16 branch pipes are provided for the drum cutter and the ring cutter.

Thus, the muddy water is not supplied from the mud feed port 26 by switching the switching valves 302 and 304, and the branch pipe 2 is switched by switching the switching valves 342, 344, 346 and 348.
By supplying mud only from 20, 230, 240 and 250, it is possible to clean the drum cutter 42 and the ring cutter 44 and to supply pressurized mud to the shield chamber 20.

When excavating a tunnel, the four cutter driving motors 36 are operated. Thereby, the gear case 3
8, the shaft 46 of the drum cutter 42 and the shaft 48 of the ring cutter 44 are driven, and the drum cutters 42 and the ring cutters 44 of the upper and lower cutter units 40a and 40b rotate, The ground is excavated in a rectangular shape by the plurality of cutter bits 50 provided on them.

The excavated earth and sand is transferred to the shield chamber 20.
It is taken into the pressurized mud inside. Here, the branch pipes 410a, 410b, 410c are switched by switching the switching valves 320a, 320b, 320c. Therefore, a muddy flow path is formed for the mud outlet connected to the branch pipe selected by this switching, and muddy water is discharged.

The branch pipes 410a, 410b, 4
As the switching method of 10c, for example, the switching valve 3
20a, 320b, and 320c are all opened and connected to three branch pipes 410a, 410b, and 410c, respectively.
The muddy water may be simultaneously discharged from the two mud holes 28a, 28b, 28c. As a result, the mud holes 26 and 3
Three muddy water passages are always formed between the two mud holes 28a, 28b, 28c to discharge mud.

Further, the switching valves 320a, 320b,
320c may be switched periodically in an arbitrary order to discharge muddy water from any of the three drainage outlets 28a, 28b, 28c. Thereby, the muddy water flow path can be arbitrarily switched and formed.

The muddy water discharged from the shield chamber 20 is sent out to a muddy water treatment plant (not shown) provided on the ground by a mud feed pump 312 and a mud feed pump 310 via a mud drain pipe 400.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

In the above-described embodiment, one washing branch pipe is provided for each drum cutter 42 and each ring cutter 44. However, the present invention is not limited to this. The number of the branch pipes may be an optimal number for cleaning the drum cutter 42 and the ring cutter 44, and these arrangement positions are arranged at optimal positions for cleaning the drum cutter 42 and the ring cutter 44. It is desirable.

In the description, the number of mud holes provided in the shield chamber 20 is three, but the number of mud holes is three.
The number is not limited to one and any number may be used.

In the above-described rectangular shield excavator,
Although only one mud hole is described, a plurality of mud holes may be provided.

Regardless of the above embodiment, for example, during excavation, pressurized muddy water is supplied only from the mud feed pipe to maintain the muddy water pressure, and washing is appropriately performed using each branch pipe. During stop, by supplying pressurized muddy water from the branch pipe for drum cutter cleaning and the branch pipe for ring cutter cleaning,
The mud pressure in the shield chamber can be constantly maintained.

[0091]

[Brief description of the drawings]

FIG. 1 is a top view of a rectangular shield excavator according to an embodiment of the present invention.

FIG. 2 is a sectional view of the rectangular shield excavator shown in FIG.

FIG. 3 is a sectional view of a shield chamber of the rectangular shield excavator shown in FIG. 1;

FIG. 4 is a diagram illustrating a muddy water shield method using the rectangular shield excavator of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Shield excavator main body 12 Cutter 14 Segment 16 Tail seal 18 Hood 20 Shield chamber 24 Partition wall 26 Mud outlet 28a, 28b, 28c Mud outlet 60a, 60b Agitator 70 Branch part 90a, 90b Mud collecting plate 200 Mud pipe 220 , 230, 240, 250 Branch pipes 302, 304 Switching valves 320a, 320b, 320c Switching valves 342, 344, 346, 348 Switching valves 221a, 221b, 231a, 231b Branch pipes 241a, 241b, 251a, 251b Branch pipes 400 Pipe 410a, 410b, 410c Branch pipe

────────────────────────────────────────────────── ─── Continuing on the front page (72) Masahiro Nakagawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Makoto Okekagawa 1-1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Inside Construction Co., Ltd. (72) Inventor Yuji Tatekawa 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References JP-A-7-76993 (JP, A) JP-A-3-2496 (JP, A) JP-A-61-92294 (JP, A) JP-A-7-158384 (JP, A) JP 7-549 (JP, Y2) JP 7-8632 (JP, Y2) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/08

Claims (8)

(57) [Claims] 1. A muddy water pipe in the shield excavator body includes a shield chamber formed between a drum cutter disposed at a tip of the shield excavator body and a partition wall of the shield excavator body. In the shield excavator which excavates while supplying against the earth pressure, the branch excavator has a branch pipe for washing the drum cutter branched from the mud pipe to the drum cutter, and the branch pipe has the drum A shield excavator, which is provided so that muddy water can be sprayed from inside the gear case to the surface of the drum cutter in the shield chamber through a gear housing for transmitting a driving force to the cutter. 2. The shield excavator according to claim 1 , wherein at least one pair of the drum cutters is provided, and a ring cutter is disposed between the pair of drum cutters. A shield pipe excavating machine having a branch pipe for cleaning the ring cutter, the branch pipe being attached along the gear case, and being disposed toward the surface of the ring cutter. . 3. A shield excavating machine according to claim 1 or claim 2, wherein the cross-sectional area of the total cross-sectional area of the branch pipe and the Okudoro tube configured equally, the total supply of mud from the branch pipe The shield excavator according to claim 1, wherein the amount is a supply amount sufficient to satisfy a supply amount of the mud for maintaining the mud pressure in the shield chamber. 4. A shield excavating machine according to any of claims 1 to 3, wherein the plurality of discharge mud port at the bottom of the partition walls, the plurality of exhaust mud port is switched by the switching valve ,
A shield excavator, which is provided at a position where different muddy water flow paths can be formed in the shield chamber. 5. A muddy water pipe in the shield excavator body includes a shield chamber formed between a drum cutter disposed at a tip of the shield excavator body and a partition wall of the shield excavator body. In the muddy water shield construction method of excavating while supplying against the earth pressure, the branch pipe for branching from the mud pipe to the drum cutter and washing the drum cutter disposed inside the drum cutter is provided. A muddy water shield method comprising: supplying pressurized muddy water toward the surface of the drum cutter in the shield chamber to maintain the muddy water pressure in the shield chamber. 6. The muddy water shield construction method according to claim 5 , wherein the mud pipe is branched to at least a ring cutter disposed between the pair of drum cutters and disposed outside the ring cutter. A pressurized muddy water is supplied from the obtained branch pipe for washing the ring cutter toward the surface of the ring cutter in the shield chamber, and the muddy water pressure in the shield chamber is maintained. . 7. The muddy water type shield method according to claim 5 and claim 6, wherein the branch pipe, the shield excavator rear from 1 ring portion of the drilling start of the segment to form the next body A muddy shield construction method, wherein the pressurized muddy water is continuously supplied until the start of excavation for one ring of the segment. 8. A mud pump in the shield excavator main body, in a shield chamber formed between a drum cutter and a ring cutter disposed at a tip of the shield excavator main body and a partition wall of the shield excavator main body. In a muddy shield construction method in which mud is supplied from a pipe to excavate while opposing earth pressure, the mud pipe and the mud pipe are branched into the drum cutter, and are disposed inside the drum cutter. One of the branch pipe for cleaning the drum cutter, and the branch pipe for cleaning the ring cutter, wherein the mud feed pipe is branched to the ring cutter and disposed outside the ring cutter. Alternatively, a muddy water shield method comprising supplying pressurized muddy water by a plurality of fluids and maintaining the muddy water pressure in the shield chamber.