JP2931283B2 - Switchable 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 switchable (dual mode type) shield machine which can be switched to a closed shield machine or an open shield machine depending on the soil to be excavated.

[0002]

2. Description of the Related Art Conventionally, when tunnel construction or the like is performed using a shield machine, a model suitable for the excavated soil has been studied. In the case of the ground, a closed shield machine is adopted, and in the case of the independent ground, the open shield machine is adopted.

[0003] By the way, depending on the construction route where the soil quality changes, it may be preferable to use both shielded shield machines and open shield machines to perform both types of excavation, even when excavating with one shield machine. is there.

In the case of such soil, excavation is performed in the soil by switching from a “sealed shield machine” to an “open shield machine” or vice versa. In addition, a “slip guide” is installed in the chamber to facilitate the collection of excavated earth and sand on the screw conveyor as a soil discharging means.

[0005] The work of installing the slip guide in the chamber is performed by confirming that there is no excavated earth and sand in the chamber, and then inserting the slip guide into the bulkhead by welding or bolting. I have.

[0006] However, the working environment in the chamber stopped during excavation is poor, requiring a lot of work time and labor, and the work requires careful attention to the spouting of sediment water. turn into.

On the other hand, as this kind of prior art, there is a device described in Japanese Utility Model Registration No. 2508363. In this invention, a retractable hopper is provided at the front of the shield body that can be taken in and out of the chamber. And

However, in this prior art, since the retractable hopper provided at the center of the shield machine advances and retreats in the chamber together with the bulkhead, the rotary joint for supplying hydraulic oil to the copy cutter of the cutter head is shielded. It cannot be provided at the machine axis.

When the shield machine becomes large in diameter,
The retractable hopper must also have a large diameter, but a large-capacity propulsion jack is required to make the retractable hopper advance into the chamber against large loads due to earth pressure, and secure installation space in a narrow shield excavator Becomes difficult. In addition, in the case of this configuration, it is also difficult to maintain the accuracy of moving the large-diameter retractable hopper parallel to the axis.

Further, in the case of such a retractable hopper, depending on the specifications of the shield excavator, it may not be installed in a narrow shield excavator.

[0011]

Therefore, in order to solve the above-mentioned problems, the invention according to the present application provides a slip guide that can protrude from the bulkhead in the axial direction below the earth removal device in the chamber, and this slip guide is provided. It is configured such that it can protrude from the inside of the shield machine below the earth removal device or can be stored in the shield body side. By providing a slip guide that can protrude below the earth removal device in the chamber or retreat from the inside of the chamber, an open-type shield machine in which the slip guide is installed by operation from the inside of the machine or a stored sealed The work to switch to the type shield machine can be performed quickly.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The invention according to this application, the bulkhead shielded-body, the Zurigaido possible projecting axially dumping device downwardly in the chamber is provided, drilled in the chamber the Zurigaido in projecting state sediment is formed in a shape to gather the earth discharging device unit, provided the Zurigaido a driving means for retracting the protruding or the chamber into the chamber in the shield body, said chamber opening into the chamber
A storage section for storing the released guide is formed, and this storage
The rod that projects or retracts the slip guide from the part is sealed
Provided inside the main body, and a soil seal is provided around this rod.
ing. By this, if the slip guide formed in a shape in which the excavated earth and sand in the chamber is gathered in the protruding state in the discharging device portion is made to protrude in the axial direction below the discharging device, the excavated sediment in the chamber is removed by the slip guide. Can be retracted from the chamber, and the slip guide can be stored in the bulkhead side if it is retracted from the chamber, and the drill can be easily switched between the open type and the closed type for excavation by moving the slip guide according to the soil quality. . When projecting this slide guide in the axial direction, it may be parallel to the axis of the shield machine or may have a slight angle, and is arranged so that the tip faces upward in consideration of soil quality and space inside the machine. May be. Also, lock
Slide guide in the chamber by expanding and contracting
Can be advanced and retracted, inside the chamber and inside the shield body
And can be sealed only with the rod and earth seal
You.

Further, if the slip guide is formed in a plate shape and a rod is provided at a predetermined position of the slip guide, the rod driving force required for projecting or retracting the slip guide into excavated earth and sand in the chamber can be reduced.

Further, if the rod is formed with a circular cross section,
Water stoppage between the inside of the chamber and the inside of the shield body can be performed with a simple configuration such as an O-ring.

Further, if a concave portion having a predetermined depth is formed at the rear end of the rod and the driving means is connected to the bottom of the concave portion, the protruding amount of the driving means inside the machine can be reduced.

Further, by providing a sediment discharge port that can be opened and closed on the inside of the storage section, the sediment that has entered the storage section can be quickly discharged when the slip guide is stored during soil compaction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. In this embodiment, a switching type (dual mode type) shield excavator capable of switching between an open type shield machine and a mud pressure shield machine which is a closed type shield machine will be described as an example.

FIG. 1 is a sectional view of a front portion of a shield machine showing an embodiment of the invention according to the present application, and FIG.
3 is a sectional view taken along line BB of FIG. 2, and FIG. 4 is a sectional view taken along line CC of FIG.

As shown, the switchable shield machine M
The cutter head N provided at the front of the drive unit 3 provided within the shield body 2 via the cutter beam 1
Is turned. In this drive, the cutter beam 1 is turned by a turning gear 5 meshed with a gear (pinion) 4 of the driving device 3. In this embodiment, the cutter beam 1 is constituted by an outer peripheral support structure provided on an outer peripheral portion.

A rotary joint 6 is provided between the center of the bulkhead R provided on the front surface of the shield body and the center of the cutter head N, and a copy cutter 7 provided on the cutter head N is provided. And the like.

The bulkhead R has a shield body 2
A manhole 8 for communicating the inside of the chamber S with the inside of the chamber S, and a screw conveyor 9 as an earth discharging device for carrying out the excavated earth and sand in the chamber S are provided. The screw conveyor 9 is fixed to the shield main body 2 with its tip protruding into the chamber S by a predetermined amount, and is provided in a state where the excavated earth and sand in the chamber S can be efficiently carried out.

Further, in this embodiment, the outer peripheral side of the cutter beam 1 is formed so as to follow the front end shape of the shield main body 2, and by rotating the cutter head N, the cutter beam 1 is moved below the chamber S. The excavated soil W is configured to be lifted up.

At a predetermined position below the screw conveyor 9, there is provided a slip guide G projecting below the screw conveyor 9 in the chamber S and to the side, and projects from the bulkhead R into the chamber S, or It is configured such that it can be stored in the bulkhead R from inside S.

The slip guide G is provided so as to be opened in the chamber S and housed in a housing 10 provided from the front surface of the bulkhead R toward the shield main body. The excavated earth and sand which is scraped up and dropped by 1 is collected in 9 parts of the screw conveyor. In this example,
Both sides are formed in a substantially V-shape facing upward. The slip guide shape may be any shape as long as excavated earth and sand falling from above both sides of the screw conveyor 9 can be collected on the screw conveyor 9 part.

The slip guide G includes a guide plate 11 formed in a plate shape, and a rod 12 provided at a predetermined position of the guide plate 11 to move the guide plate 11 forward and backward. In this embodiment, Two rods 12 are provided at symmetric positions.

A bulkhead R for accommodating the rod 12
The storage section 13 having a circular cross section provided in the storage section 13 functions as a guide section on which the rod 12 slides, and a seal cylinder 14 is provided inside the storage section 13.
Sealing member 15 that stops water by contacting the outer peripheral surface of rod 12
Is provided. In this embodiment, the rod 12 is formed in a circular cross section, so that a simple sealing member 15 such as an O-ring can be used. This rod 12
May be a polygonal cross section or the like in addition to the circular cross section, and may not be necessary if the guide plate 11 has sufficient strength.

In this embodiment, a predetermined length of the rod 12 inside the machine is formed in a cylindrical shape, and the inside concave portion 12a
A drive jack 16 as drive means for projecting or retreating the slip guide G is connected to the bottom of the drive jack 16, and the rear end of the drive jack 16 is fixed to the shield body 2.
As described above, by connecting the tip of the driving jack 16 to the bottom of the concave portion 12 a formed inside the rod 12,
The projecting length of the drive jack 16 inside the machine is reduced.
The entire rod 12 is formed of a rod material.
May be connected to the rear end of the drive jack 16. V
Is the projecting length of the slip guide G, and the drive jack 16 only needs to have a stroke equal to or greater than this length.

According to the switchable shield excavator M configured as described above, it is different by switching from the “mud pressure shield machine” to the “open type shield machine” or vice versa as follows. It is possible to excavate soil construction lines continuously and efficiently.

That is, in the case of soil that can be efficiently excavated by excavating with a mud pressure shield machine, the slip guide G
Is excavated in a state where it is stored in the storage section 10, and the excavated earth and sand taken into the chamber S is efficiently carried out by the screw conveyor 9.

When the excavation by the open-type shield machine becomes more effective in excavation due to a change in soil quality, as shown in a BB cross-sectional view of the slip guide projecting state shown in FIG. Is extended so that the slip guides G protrude from the storage sections 10 and 13 and are installed below and on the side of the screw conveyor 9. In this state, the excavated sediment W taken into the chamber S is lifted up by the rotation of the cutter beam 1, and excavated sediment W dropped from the cutter beam 1.
Fall on the slip guide G and are collected at the screw conveyor 9, and are efficiently carried out to the rear of the shield machine M by the screw conveyor 9.

As described above, when used as an open shield machine, the slip guide G is protruded by an operation from the inside of the machine, so that the excavated earth and sand excavated by the cutter head N and taken into the chamber S is cut into the cutter beam 1. If it is lifted up and dropped onto the slip guide G, it is collected to the screw conveyor 9 by the slip guide G, so that the screw conveyor 9 can efficiently carry it out even in the open state.

In this embodiment, the slip guide G is moved to the chamber S.
In the case of installation in the chamber S, the plate-shaped guide plate 11 housed in the housing portion 10 opened in the chamber S is projected into the chamber S by extending the plurality of rods 12, Even if it is full of earth and sand, the area to penetrate into the earth and sand is a small area only on the front of the plate-shaped slip guide and the entire surface of the rod,
It can be projected with a small force.

As described above, by controlling the drive jack 16 provided in the shield main body 2 in the machine, only the slip guide G can be installed or stored.
The time and labor required for the work of switching the shield machine can be greatly reduced. Moreover, it is also possible to use a conventionally used rotary joint,
The switching type shield machine M can be configured without requiring a special joint.

[0034] Therefore, from "mud pressure shield machine" to "open shield machine", and conversely, "open shield machine"
The function to switch the function from the “Soil pressure shield machine” to the “Soil pressure shield machine” can be performed quickly and quickly from the inside of the machine.

As described above, if the slip guide is protruded into the chamber, the mode is switched to the open type shield machine, and if the slip guide is retracted from the chamber, the mode is switched to the mud pressure (closed type) shield machine. , And can be continuously and efficiently excavated with an open or closed shield machine. If a switching device (not shown) for performing this switching is provided, automatic switching between the open type and the closed type in conjunction with the advance / retreat of the slip guide becomes possible.

In the above embodiment, the cutter beam 1 has a structure capable of scraping up the earth and sand. However, means for scraping up the earth and sand in the chamber S may be provided as a separate member from the cutter beam 1. However, the present invention is not limited to this.

In the above embodiment, the two rods 12 are provided at symmetrical positions. However, the rods 12 are preferably arranged in a preferable position in accordance with the size of the shield machine M and the size of the slip guide G. The position is not limited to the above position.

[0038]

The invention according to this application is implemented in the form described above, and has the following effects.

[0039] and open the shield machine is protruded into the chamber to Zurigaido, since the Zurigaido can be switched to a closed type shield machine retracted from the chamber, preferably open by advancing and retracting the Zurigaido depending on soil It is possible to excavate efficiently with a shield machine of a mold type or a closed type.

Further, since the slip guide installation work and the removal work in the chamber can be easily and quickly performed from the inside of the shield machine without entering the chamber, the worker can quickly operate without worrying about the burial of earth and sand. The switching operation can be performed.

Further, a storage portion is formed in the chamber to store the slip guide, and a rod for projecting or retracting the slip guide from the storage portion is extended and retracted from the shield body, so that the installation or storage of the slip guide can be easily performed from inside the machine. The sealing can be easily performed between the inside of the chamber and the inside of the shield body only with the earth and sand seal of the rod.

If the slip guide is formed in a plate shape and a rod is provided at a predetermined position of the slip guide, the rod driving force required for projecting or retracting the slip guide into the excavated earth and sand in the chamber can be reduced. The driving means can be reduced in size.

If this rod is formed in a circular cross section, it becomes possible to stop water between the inside of the chamber and the inside of the shield body by a simple structure such as an O-ring.

Further, if a concave portion having a predetermined depth is formed at the rear end of the rod, and the driving means is connected to the bottom of the concave portion, the protruding amount of the driving means inside the machine can be reduced.

Further, by providing a sediment discharge port that can be opened and closed on the inside of the storage unit, the sediment that has entered the storage unit when the slip guide is stored can be quickly discharged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a front part of a shield machine showing an embodiment of the invention according to this application.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along the line CC of FIG. 2;

FIG. 5 is a BB diagram showing a state in which the slip guide shown in FIG. 3 protrudes;
It is sectional drawing.

[Description of Signs] 1 ... Cutter beam 2 ... Shield body 3 ... Driver 4 ... Gear (pinion) 5 ... Slewing gear 6 ... Rotary joint 7 ... Copy cutter 8 ... Manhole 9 ... Screw conveyor 10 ... Storage section 11 ... Guide plate DESCRIPTION OF SYMBOLS 12 ... Rod 13 ... Storage part 14 ... Seal cylinder 15 ... Seal member 16 ... Drive jack W ... Excavated earth N ... Cutter head R ... Bulkhead S ... Chamber G ... Slip guide M ... Switching type shield excavator

Continuation of front page (72) Inventor Keiichi Tanaka 1-3-1, Higashikawasaki-cho, Chuo-ku, Kobe City, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Kobe Main Office (56) References Real Opening Hei 1-444632 (JP, U) Utility Model Registration 2508363 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/12

Claims (5)

(57) [Claims] 1. A shield excavator having an earth removal device for taking earth and sand excavated by a cutter head provided at a front portion of a shield body into a chamber and carrying the earth and sand in the chamber to the rear of the shield excavator. In the bulkhead of the shield body, a slip guide that can protrude in the axial direction below the earth removal device in the chamber is provided. Driving means for projecting the sliding guide into or out of the chamber is provided in the shield body , and the chamber is provided in the chamber.
Forming a storage section for storing the open slide guide in the chamber
And a lock for projecting or retracting the slip guide from the storage portion.
A shield in the body of the shield,
Switching shield excavator characterized by the provision of 2. The slip guide is formed in a plate shape, and a rod is provided at a predetermined position of the slip guide.
1. The switchable shield machine according to 1. 3. A process according to claim 1 or claim 2 switchable shield machine, wherein the forming the rod with circular cross-section. 4. a recess at the rear end to a predetermined depth of the rod, switching type according to claim 1, characterized in that it has connected the drive means to the bottom of the recess Shield machine. 5. A switching type shield machine according to any one of claims 1 to 4, an openable and closable sediment discharge port provided on the inboard side of the housing portion, characterized in that the measures during soil compaction .