JP2872898B2 - Mud type shield machine and mud water supply method in mud type shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy shield excavator capable of uniformly circulating and fluidizing muddy water supplied to a pressure chamber holding a face collapsed earth pressure, thereby preventing the adhesion, accumulation and blockage of earth and sand slurry. And a method for supplying muddy water in a muddy shield machine.

[0002]

2. Description of the Related Art A conventional muddy shield machine is shown in FIG.
As shown in FIG. 4, a rotating body (bulk head inner cylindrical portion) 4 rotates around a shield axis O via a bearing 3 in a partition wall (bulk head) 2 provided at a front portion of a shield main body 1 having a circular cross section. A cutter head 6 is provided via a plurality of support legs 5 which are freely disposed and project forward from the rotating body 4. The cutter head 6 has a plurality of cutter bits 9 attached to an edge of a sediment inlet 8 formed in a cutter face plate 7 in a radial direction, and a ring gear 10 provided at a rear end of the rotating body 4. The pinion 12 driven by the drive motor 11 is engaged and is rotationally driven. The space between the partition wall 2 and the cutter head 6 is formed as a pressure chamber 13 for holding the collapsed earth pressure of the face, and a pressure chamber 13 is connected to the pressure chamber 13 through the upper part of the partition wall 2 and connected thereto. Muddy water is supplied into the pressure chamber 13 along the direction of the inner shield axis O, and the soil and the muddy water excavated and taken in by the cutter head 6 in the pressure chamber 13 are stirred and kneaded to maintain the face pressure. , The partition wall 2 just below the shield axis O and on both sides thereof
Are discharged from the three drainage pipes 15 connected to the pressure chamber 13 through the drainage pipe. This muddy shield excavator excavates a tunnel while circulating muddy water in the pressure chamber 13 and forms an impermeable film on the facet with muddy water to protect the facet and prevent ground collapse, It is constructed so that the impermeable membrane and mud pressure control the outflow of groundwater and support the face pressure. Reference numeral 16A denotes a central agitator provided on the rotating body 4 for stirring earth and sand slurry, and 16B denotes a discharge agitator provided on the partition wall 2 near the entrance of the exhaust pipe 15 for stirring earth and sand slurry.

[0003]

However, in the above configuration, the cutter head 6 is inserted into the pressure chamber 13 from the mud feed pipe 14.
Muddy water sprayed and supplied along the shield axis O direction toward the bottom, while being mixed and agitated with the excavated earth and sand, descends with its own weight and the rotation of the cutter head, and is discharged from the mud discharge pipe 15, In particular, there is a problem that the slurry hardly flows at the center of rotation of the pressure chamber 13 where the rotational force of the cutter head 6 is hardly transmitted, that is, at the shield axis O, and the earth and sand slurry easily stays and closes. In particular, in the case of the inner cylinder rotating type shown in FIG. 3 in which the rotating body 4 and the cutter head 6 in the central part of the partition wall 2 rotate relative to each other, relative movement of muddy water is hard to occur, and sediment slurry adhesion, adhesion and blockage occur more. Cheap.

SUMMARY OF THE INVENTION The present invention solves the above problems and promotes fluidization of muddy water in a pressure chamber, thereby preventing sediment adhesion and stagnation and clogging of sediment slurry, thereby enabling efficient muddy shield excavation. An object of the present invention is to provide a method for supplying muddy water in an excavator and a muddy shield excavator.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a partition head in the front of a shield body provided with a cutter head rotatable around a shield axis via a bearing. It supplies the mud from Okudoro tube in the pressure chamber between, in a shield machine for discharging the gravel slurry from waste sludge pipe, left from a position directly above the shield axis
The first and second mud pipes are pierced through the right and left bulkheads
At the same time, a drainage pipe is pierced in the partition below the pressure chamber,
The first mud pipe and the second mud pipe correspond to the rotation direction of the head.
From the position just above the shield axis,
Muddy water into the pressure chamber from the mud pipe on the rear side
It is configured so that

[0006]

[0007]

Further, the method of supplying muddy water is a method in which a pressure chamber formed between a partition in front of the shield main body and a cutter head rotatably supported around the shield axis by the partition at the front of the partition. A first mud feed pipe or a second mud feed pipe connected through right and left partition walls from a position immediately above the shield axis, respectively.
Along with supplying muddy water from a mud feed pipe, upon discharging earth and sand slurry from a mud pipe connected to a pressure chamber through the lower part of the partition wall, corresponding to the rotation direction of the cutter head,
The muddy water is supplied to the pressure chamber from a mud pipe connected to a rear side in the rotation direction of the cutter head from a position immediately above the shield axis among the first mud pipe and the second mud pipe.

[0009]

According to the above-mentioned apparatus and method, it is supplied from a mud pipe.
Mud is generated mainly by the rotation of the cutter head.
Revolves in the direction of rotation of the tta head and descends to the drain pipe
Swirling mud and its own weight to descend downward
And is dispersed with the descending mud which reaches the mud pipe and circulates in the pressure chamber
I do. Therefore, the cutter can be used from the position just above the shield axis.
It is supplied from a mud pipe connected to the opposite side of the head rotation direction.
The amount of swirling mud and the amount of descent are almost evenly distributed.
Muddy water evenly distributed throughout the pressure chamber.
Can increase the fluidity of the sediment slurry,
Adhesion, stagnation, and blockage can be prevented.

[0010]

[0011]

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a muddy shield machine according to the present invention will be described below with reference to FIGS. The same members as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

In the pressure chamber 13, four switchable mud feeding tubes 21A, 21B, 22A, 22B are connected. That is, right above the shield axis O of the partition 2 (0 °
(Right) (rear in the rotation direction A of the cutter head 6)
Then, the first main mud feed pipe 21A is connected to the pressure chamber 13 through the partition wall 2 at a predetermined position within the range of α1 = 5 ° to 45 °, and is directly above the shield axis O of the partition wall 2 ( On the left side (0 ° position) (forward in the rotation direction A of the cutter head 6),
The second main feed pipe 21B is connected to a predetermined position within a range of α2 = 5 ° to 45 °.

The muddy water supplied from the first and second main mud feed pipes 21A and 21B is mainly composed of descending muddy water A descending downward on its half surface on the mud feed pipe mounting side by its own weight, and rotation of the cutter head 6. And is swirled together with the swirling muddy water B descending on the opposite half surface on the mud pipe attachment side. Therefore, by equalizing the amounts of the descending muddy water A and the swirling muddy water B distributed on the left and right sides of the shield axis O from the first and second main feed pipes 21A and 21B, the muddy water in the entire pressure chamber 13 is increased. In addition, the fluidization of the earth and sand slurry is promoted, so that the adhesion, stagnation and clogging of the earth and sand slurry can be prevented. Therefore, the on-off valves 23A and 23B interposed in the first and second main feed pipes 21A and 21B, respectively, are operated to rotate the cutter head 6 in the rotation direction A.
Or, corresponding to B, the muddy water is supplied only from one of the first main mud pipe 21A and the second main mud pipe 21B on the rear side in the rotation direction of the cutter head 6 from immediately above the shield axis O (position of 0 °). Is supplied. The first and second main feed pipes 21A, 21A
The connection position of 1B is 5 ° to 45 ° depending on the shape of the pressure chamber 13 and the cutter head 6 and the properties of earth and sand and muddy water.
Are set in the range of 20 ° to 25 ° with particularly high dispersion efficiency in this embodiment. Here, if the first and second main feed pipes 21A and 21B are connected at less than 5 °, the amount of muddy water flowing forward in the rotation direction of the cutter head 6 becomes excessive, and conversely, 45 °. Is exceeded, the amount of muddy water flowing backward in the rotation direction of the cutter head 6 becomes excessive.

The first and second main feed pipes 21
A and 21B are configured such that their discharge ports 21a are inclined by 45 ° with respect to the shield axis O in a plane including the shield axis O, for example, and inject muddy water to the shield axis O side. As a result, the amount of muddy water fed to the shield axis O is increased, and the earth and sand to be attached and deposited at the center of rotation (shield axis O) in the pressure chamber 13 is caused to flow to flow the earth slurry. Can be promoted. Therefore, the effective inclination angle of the discharge ports 21a of the first and second main feed pipes 21A and 21B is set to β = 10 ° capable of supplying muddy water to the shield axis O side according to the structure of the shield machine.
What is necessary is just to select arbitrarily from the range of 90 degrees.

In the vicinity of the shield axis O of the rotating body 4, for example, two auxiliary mud feed pipes 22 penetrate through the rotating body 4 and are provided in the pressure chamber 13, and a rotary joint provided at the rear of the rotating body 4. The muddy water is supplied from the discharge port of the auxiliary mud feeding pipe 22 to the rotation center of the pressure chamber 13 along the shield axis O direction by operating the on-off valve 25. The muddy water supplied to the center of rotation in the pressure chamber 13 can fluidize the sediment that is stagnant, adheres and closes. Of course, the pressure chamber 13
The muddy water can be arbitrarily supplied from the auxiliary mud feeding pipe 22 depending on the state of the inside, or can be always supplied. Also,
The number of the auxiliary mud feeding pipes 22 is two, but may be one,
There may be three or more.

Next, a method of supplying muddy water with the above configuration will be described. When the cutter head 6 is driven to rotate in the direction of arrow A, muddy water is supplied into the pressure chamber 13 from the first main mud feed pipe 21A, and muddy water is supplied from the sub mud feed pipe 22. The muddy water supplied from the discharge port 21a of the first main mud pipe 21A is discharged toward the shield axis O side, and at the same time, is dispersed almost equally to the descending muddy water A and the swirling muddy water B. , Is also sufficiently fed to the shield axis O side. Further, muddy water from the auxiliary mud feeding pipe 22 is jetted to the rotation center (the shield axis) of the pressure chamber 13. Therefore,
Fluidization of the muddy water and the earth and sand slurry in the pressure chamber 13 is promoted by the descending muddy water A and the swirling muddy water B that are evenly sent, and the muddy water discharged toward the shield axis O side and the auxiliary mud pipe 22 Fluid of the earth and sand slurry in the center of rotation of the pressure chamber 13 is promoted by the muddy water, and it is possible to reliably prevent the adhesion and accumulation of earth and sand and blockage.

When the cutter head 6 is driven to rotate in the direction of arrow B, the muddy water is supplied from the discharge port 21a of the second main mud feed pipe 21B into the pressure chamber 13 and the muddy water is supplied from the sub mud feed pipe 22. Is done. The mud supplied from the second main feed pipe 21B is discharged toward the shield axis O side, and at the same time, is dispersed substantially evenly to the descending muddy water A and the swirling muddy water B, and at the same time, Sufficiently sent to O side. Further, muddy water from the auxiliary mud feeding pipe 22 is jetted to the rotation center (the shield axis) of the pressure chamber 13. Therefore,
Fluidization of the muddy water and the earth and sand slurry in the pressure chamber 13 is promoted by the descending muddy water A and the swirling muddy water B that are evenly sent, and the muddy water discharged toward the shield axis O side and the auxiliary mud pipe 22 Fluid of the earth and sand slurry in the center of rotation of the pressure chamber 13 is promoted by the muddy water, and it is possible to reliably prevent the adhesion and accumulation of earth and sand and blockage.

In the above embodiment, in order to fluidize the muddy water and the earth and sand slurry in the pressure chamber 13 to prevent stagnation and blockage, the central part agitator 16A and the discharge part agitator 16B have three requirements, namely the rotation of the cutter head 6. First and second main mud pipes 21 that can be switched according to the direction
A, 21B, first and second main mud feed pipes 21A, 21B capable of ejecting muddy water to the shield axis O side, and auxiliary mud feed pipes 22A, 22B provided on the rotating body 4 are simultaneously used. Due to the synergistic effects of each, an effective fluidization of the earth and sand slurry in the pressure chamber 13 is realized, but by using each alone or in any combination, fluidization of the muddy water and the earth and sand slurry in the pressure chamber 13 is achieved. Can be promoted.

[0021]

According to the present invention, there is provided a muddy water shield excavator having the above-described structure.
According to the muddy water supply method, the rotating direction of the cutter head
Supply mud from the first or second mud pipe at the back
The muddy water is mainly entrained by the rotation of the cutter head.
To rotate in the direction of cutter head rotation and opposite the mud pipe mounting surface.
Mud is fed by the swirling muddy water descending to the side and its own weight.
Almost evenly dispersed in the downward muddy water descending to the pipe mounting surface side
And circulate through the pressure chamber,
Enhance fluidity to prevent sediment adhesion, stagnation and blockage
be able to.

[0022]

[0023]

[0024]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a pressure chamber showing one embodiment of a muddy shield machine according to the present invention.

FIG. 2 is a schematic front sectional view showing a pressure chamber of the muddy shield machine.

FIG. 3 is a central longitudinal sectional view showing a conventional muddy shield excavator.

FIG. 4 is a front half sectional view showing a conventional muddy shield excavator.

[Explanation of symbols]

 O Shield axis 1 Shield body 2 Partition wall 3 Bearing 4 Rotating body 5 Support leg 6 Cutter head 7 Cutter face plate 8 Sediment intake 9 Cutter bit 10 Ring gear 11 Drive motor 12 Pinion 13 Pressure chamber 14 Mud pipe 15 Mud pipe 16A Central Unit agitator 16B Discharge unit agitator 21A First main mud feed pipe 21B Second main mud feed pipe 21a Discharge port 22 Secondary mud feed pipe 23A Open / close valve 23B Open / close valve 24 Rotary joint 25 Open / close valve

──────────────────────────────────────────────────の Continuing on the front page (72) Kazuya Sasaki 5-28-3, Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Emiko Higashi5, Nishikujo-5, Konohana-ku, Osaka-shi, Osaka No. 3-28, Hitachi Zosen Corporation (56) References JP-A-61-92294 (JP, A) JP-A-54-484727 (JP, U) JP-A-58-72297 (JP, U) 59-16072 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 301

Claims (2)

(57) [Claims] A cutter head rotatable around a shield axis is provided on a partition wall in front of a shield body via a bearing, and muddy water is supplied from a mud pipe into a pressure chamber between the partition wall and the cutter head, and drainage is performed. In a shield machine that discharges sediment slurry from a mud pipe, the right and left from the position just above the shield axis
When the first mud pipe and the second mud pipe are penetrated in the partition walls on both sides,
In both cases, a drainage pipe is pierced in the partition below the pressure chamber,
The first mud pipe and the second mud pipe correspond to the rotation direction of the head.
Cutter head from the position just above the shield axis of the mud pipe
Supply muddy water into the pressure chamber from the mud pipe on the rear side in the
A muddy shield excavator characterized by being configured as follows . 2. A pressure chamber formed between a partition wall at the front of the shield body and a cutter head rotatably supported around the shield axis at the partition wall at the front of the partition wall. The muddy water is supplied from a first mud feed pipe or a second mud feed pipe connected through the partition walls on both the left and right sides from the position, and a mud pipe connected through the lower part of the partition wall and connected to the pressure chamber. In discharging the earth and sand slurry, a mud feeder connected to a rear side in the rotational direction of the cutter head from a position immediately above the shield axis, of the first mud feeder pipe and the second mud feeder pipe, corresponding to the rotational direction of the cutter head. A method for supplying muddy water in a muddy shield machine, comprising supplying muddy water from a pipe into a pressure chamber.