JP2844449B2 - Shield excavator for integrated segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of constructing a segment wall using an integral elastically deformable ring-shaped segment having a predetermined width (for example, 350 to 700 mm) and being continuous in a circumferential direction. Related to shield machine. The ring-shaped segment is mainly formed of a steel pipe or the like, and is carried into the excavator in a state of being flattened into an ellipse. After that, the ring-shaped segment is returned to a true circle and is connected along the excavation direction to form a segment wall.

[0002]

2. Description of the Related Art In a shield machine, excavation work is performed by constructing a segment wall behind and obtaining a propulsive force by pressing a shield jack against the constructed segment wall. It is common to construct a segment wall by connecting a plurality of segment pieces separated in directions in a circumferential direction into a ring shape and connecting the ring-shaped segments also in a digging direction. For example, a shield machine (electr device) using a segment with such a structure
There is one described in JP-A-3-121700. In this type of shield excavator, usually only a cutter disk drive and a shield jack are mounted in the excavator.For example, a shield operation panel, a pump unit and an oil tank unit are mounted on rails laid in an existing segment. It is mounted on the rear bogie that travels.

[0003] In addition, as an excavator (a segment transport reversing device) using an elliptical integrated segment,
There is one described in Japanese Patent Publication No. 8-19836. However, the segments described in the publication are non-deformed.

[0004]

The conventional shield machine described above has the following inconvenience when an integral elastically deformable ring-shaped segment is used.

(1) It is difficult to carry the ring-shaped segment into the excavator in a state where the ring-shaped segment is flattened in an elliptical shape because the rear bogie is in the way.

(2) Even if the ring-shaped segment can be carried into the excavator, when connecting the segment to the existing segment, all the shield jacks need to be contracted and drawn in. There is a danger that the excavator will retreat under pressure or mud pressure.

(3) Compared to the case of constructing a segment wall using segment pieces divided in the circumferential direction, it takes a lot of time to fasten the segment pieces with bolts, and due to poor fastening, etc. Water leakage may occur from the divided part.

(4) In the latter case (Japanese Patent Publication No. Hei 8-19836), the excavator is separate from the excavator, and the earth pressure and the muddy water pressure do not act on the excavator even during excavation. Is not the subject of the task. Although the machine uses an elliptical integrated segment, the segment is not deformed and the type of the segment used is different.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to construct a segment wall using an integral elastically deformable ring-shaped segment continuous in a circumferential direction.
An object of the present invention is to provide a shield machine capable of efficiently and safely excavating a circular tunnel.

[0010]

In order to achieve the above-mentioned object, a shield machine according to the present invention comprises: a) a plurality of shields spaced circumferentially behind a cylindrical shield shell of the shield machine; A jack is arranged, and b) some of these shield jacks are arranged radially inward from the inner diameter of the circular segment restored from the elliptical flat state, and at the rear end of the jack, An abutment piece projecting inward from the inner peripheral wall of the segment is configured to be able to be pressed, and c) the remaining jack extends outside the circular segment along the inner peripheral surface of the shield shell from its rear end. Attachment bar passing through is extended rearward, and at the rear end of the bar, one end of a pressing tool capable of pressing the end face of the segment is bent radially inward at a right angle refraction position and an extension line of the bar. The pivotally pivoted between a rearward deployed position, is biased (by pressing implement its own weight or spring) so as to refract said pusher radially inward. In the above configuration b), `` the jack is arranged radially inward of the inner diameter of the circular segment ''
It means that the piston rod of the jack is arranged to be able to pass inside the circular segment.

According to the shield machine of the present invention having the above configuration, when the segment is carried into the machine,
By pulling the jack for pressing the contact piece to the excavator side so that it does not hinder the loading, the excavator is pressed by pressing the front end face of the existing segment with the pressing tool of the attachment bar of the remaining jack. It can be prevented from retreating due to earth pressure or mud pressure. Also, after loading the segment, pull in the jack with the attachment bar,
Although the front end surface of the segment can be pressed against the existing segment side by the pressing tool, the pressing tool turns upward and escapes during retraction, so that interference with the segment is avoided. Then, during the excavation work, the jack for pressing the contact piece and the jack for pressing the end face of the segment with the pressing tool are simultaneously extended, and the excavator can be advanced gradually.

[0012] As described in claim 2, it is preferable that d) a starting device such as a cutter disk driving device, an oil tank, and a control panel be provided in the excavator.

According to the shield machine described in claim 2,
Since the rear bogie on which the starting device is mounted becomes unnecessary, when the segments are carried into the excavator in an elliptical flat state, the segments can be carried in smoothly and in a short time.

[0014] According to a third aspect of the present invention, e) a rear portion of the excavator is divided into a main body portion in front of the excavator, and the divided rear portion is connected to the main body portion so as to be swingable in a horizontal direction. A jack may be disposed rearward from the body portion through the interior of the split rear.

According to the shield machine described in claim 3,
Even if the tunnel is bent in the horizontal direction, the rear part of the excavator is bent in the bending direction of the tunnel with respect to the main body, and the loading work is facilitated by loading the segments into the rear part, and the existing equipment is installed. The work of connecting the carried-in segments to the segments can also be performed smoothly.

According to a fourth aspect of the present invention, f) the segment supporting base is extended forward from the front end of the self-propelled bogie.
It is preferable to provide a segment carrying truck provided with a support portion for supporting the segment, which is flattened in an elliptical shape, on the front end portion of the segment support table so as to be capable of turning.

According to the fourth aspect of the present invention, the flattened segment can be easily and smoothly loaded into the excavator, and the segment can be easily turned in a predetermined direction after being loaded. However, it can be arranged in a state where it can be connected to the existing segment.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shield machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a central longitudinal sectional view showing an embodiment of a shield machine, FIG. 2 is a plan sectional view showing an embodiment of a shield machine, FIG. 3 (a) is a sectional view taken along line AA of FIG. 3B is a sectional view taken along line BB of FIG. 1, and FIG. 3C is a sectional view taken along line CC of FIG.

As shown in FIGS. 1 and 2, the shield machine 1 of this embodiment is divided into a front part (main body) 2 and a rear part 3, and a rear part 3 is provided.
Is pivotally connected to the main body 2 in a horizontal direction by pivot connection pin mechanisms 4 at the upper and lower portions in the center. The main body 2 has a cylindrical shield shell 2a, and the rear part 3 has a cylindrical shield shell 3a. At the front end of the main body 2, a cutter disk 5 is rotatably center-supported by a bearing 6a and a support shaft 6b. A cylindrical frame 5a extends rearward from the peripheral edge of the cutter disk 5, and a ring gear 7a is fixedly provided at the rear end. Drive gears 7b of a plurality of drive motors 7 mesh with the ring gears 7a, respectively. The cutter disk 5 is rotated by the simultaneous rotation. The front end opening of the screw conveyor device 8 extends through the bulkhead 5c into the cutter chamber 5b, while the rear end of the screw conveyor device 8 extends slightly upward into the rear portion 3. On the lower surface of the rear end of the screw conveyor device 8, an outlet 8a for earth and sand is opened, and a gate 8b is attached to the outlet 8a so as to be openable and closable.

From the rear end in the main body 2, a plurality of wires (8 in this example)
As shown in FIG. 3 (a), the shield jack 9 of the present invention is disposed at a circumferential interval toward the rear end in the rear portion 3.

In the main body 2, all the starting devices 1 such as an oil tank 11 as a power unit and an operation panel 12 are provided.
0 is mounted. Further, at the rear of the shield machine 1 (rear part 3), an existing segment S 'formed by sequentially connecting the ring-shaped segments S is constructed, and the center of the lower surface of the existing segment S' is shown in FIG. As shown in c), the segment carry-in (and assembling) cart 15 travels. The carry-in carriage 15 is self-propelled and has a segment support 15a projecting forward from the front end of the carry-in carriage 15 to protrude therefrom.
A support portion 15b is erected on the front end of the support member 15a, and the segment S is supported on the upper end of the support portion 15b so as to be pivotable in the vertical direction. The segment S is pulled into an elliptical flat state by a chain block or the like at the time of loading, a shaft (not shown) is attached between the short diameter positions of the segment S, and a support portion is provided via the shaft (not shown). 15b. The segment S used in this example has an outer diameter of about 2 m,
The board width is about 700 mm and the board thickness is about 12 mm. Further, on the inner peripheral surface of the segment S 'at the foremost position of the existing segment S', the contact piece Sa can be detached inwardly at an interval in the circumferential direction as shown in FIG. To protrude. The number and position of these contact pieces Sa correspond to the number and position of the shield jack 9. The fixing of the contact piece Sa to the inner peripheral surface of the segment S ′ is performed by using the contact piece Sa.
Is bent rearward at a right angle, the bent portion is formed in a locking piece, and the engaging groove of the locking piece is
May be provided on the inner peripheral surface of the device, or may be detachable by using a magnetic force. In addition, a contact piece Sa may be provided on the inner peripheral surface of each segment S, and the segment S may be slightly rotated in the circumferential direction as necessary.

Further, as shown in FIG.
A roller conveyor device 16 is provided in parallel with and adjacent to the transport path No. 5. The front portion of the roller conveyor device 16 has a telescopic structure. The roller conveyor device 16 enters and exits forward from the position of the segment S supported by the support portion 15b of the carry-in vehicle 15, and the front end of the roller conveyor device 16 extends in the extended state. The screw conveyor 8 reaches just below the outlet 8a. Therefore, it does not hinder the loading of the segment S or the turning operation.
It is necessary to supply power to the drive motor 7 and the like in the excavator 1, and this is achieved by connecting a power cable (not shown) from the inner peripheral surface of the existing segment S ′ to the shield shells 3 a and 2 a.
Are introduced into the excavator 1 along the inner peripheral surface of the roller, so that they do not hinder the loading of the segment S and the turning work as in the roller conveyor device 16.

In order to use the ring-shaped segment S in the shield machine 1 of the present invention, the following points have been devised the most. That is, after removing the chain block or the like and restoring the segment S to a circular shape by the elastic force thereof, the segment S is turned upright by approximately 90 ° about the upper end of the support portion 15b in the vertical direction. In the state where the circular segment S is arranged at the center of the inside, each shield jack 9 is connected to the body of the excavator 1 so that the piston rod 9a of the shield jack 9 passes through the inside of the segment S as shown in FIG. 2 are arranged. And, it is configured such that the contact piece Sa in the segment S can be pressed by the tip of each piston rod 9a. Further, one end of the attachment bar 17 is fixed to the tip of the piston rod 9a of every other shield jack 9 (hereinafter, referred to as jack 9A) in the circumferential direction so that the attachment bar 17 can pass outside the segment S, The other end of the attachment bar 17 extends rearward. Note that the attachment bar 17
Is hereinafter referred to as a jack 9B.

As shown in FIG. 4, a base end of a substantially L-shaped pressing member 18 is pivotally attached to the rear end of the attachment bar 17 by a pivoting member 19 so that the front end thereof can pivot vertically. At the same time, in a state where the pressing tool 18 is rotated clockwise (forward / downward) by its own weight, the stopper member 20 is attached to the attachment bar 17 so that the pressing tool 18 does not rotate forward from the radially inward right-angle refraction position. Projecting downward at right angles to the lower surface of the rear end. Then, at the right angle refraction position, the inner bent portion of the pressing tool 18 is brought into contact with the end surface of the segment S as shown in FIG. On the other hand, when the shield jack 9 is contracted and pulled in, the pressing tool 18 comes into contact with the outer end of the segment S and turns counterclockwise (upward and backward) against its own weight to avoid interference with the segment S. And moves forward past the outside of the segment S. The pressing tool 18 may be positively urged clockwise using a spring without depending on its own weight.

Next, the excavation operation of the shield excavator 1 according to the present embodiment configured as described above will be described. Here, a case where a narrow (350 mm) segment S is used is taken as an example. 5 and 6 are partial front views sequentially showing the steps of excavation and segment construction.

A plurality (eight) of shield jacks 9
Of which jacks 9B are arranged every other in the circumferential direction
To the existing segment S ′.
And the pressing member 18 at the rear end of the attachment bar 17 of the remaining jack 9A is brought into contact with the front end surface of the segment S. In this state, each shield jack 9A / 9B
The excavator 1 is gradually advanced while simultaneously extending, and the cutter disk 5 is rotated to perform excavation work (FIG. 5).
(a)).

With the pressing tool 18 of the attachment bar 17 of each jack 9A in contact with the front end surface of the segment S, the remaining jack 9B is contracted, and the piston rod 9a is separated from the contact piece Sa of the segment S. .

Then, the segment S, which is made to travel in the existing segment S 'and is pulled flat by a chain block or the like on the support base 15a of the segment carry-in vehicle 15, is placed horizontally, and the rear portion 3 is shielded. It is carried into the shell 3a. Then, after removing the chain block or the like of the segment S to make it a perfect circle, it is turned upright by 90 ° to stand. During this time, shield machine 1
Is prevented from retreating by the existing segment S 'via the jack 9A and the attachment bar 17 / pressing member 18 (FIG. 5B).

The jack 9B is extended, and its piston rod 9a penetrates the inside of the loaded segment S and is brought into contact with the contact piece Sa temporarily provided on the existing segment S '.
The carry-in segment S is slightly rotated in the circumferential direction so that the piston rod 9a does not hit the contact piece Sa. Subsequently, the jack 9A is contracted, and the pressing tool 18 of the attachment bar 17 is moved forward of the loading segment S. However, when the pressing tool 18 comes into contact with the outer end of the loading segment S, the pressing tool 18 rotates counterclockwise and escapes. The forward movement of the attachment bar 17 is not hindered. During this time, the shield machine 1 is connected to the existing segment S ′ via the piston rod 9a of the jack 9B.
This prevents retreat (FIG. 6 (c)).

The jack 9A is extended, the front end face of the carry-in segment S is pressed by the pressing tool 18 of the attachment bar 17, and the carry-in segment S is loosely fitted into the existing segment S '. After this, the piston rod 9 of the jack 9B
a is contracted and pulled forward, the carry-in segment S is slightly rotated in the circumferential direction, the piston rod 9a of the jack 9B is extended, and the contact piece S temporarily attached to the carry-in segment S is extended.
a, and the carry-in segment S is firmly fitted into the existing segment S ′. As a result, the carry-in segment S is connected to the existing segment S ′ (FIG. 6D).

Thereafter, by repeating the above-described steps in order, the excavator 1 excavates and a tunnel is excavated, and at the same time, a segment wall ′ is constructed behind the excavator 1.

FIG. 7 shows another embodiment of the shield machine. In this embodiment, the shield S is loaded with the segment S standing upright. For this reason, the width of the segment carrying vehicle 15 is increased corresponding to the segment S. The support portion 15b at the front end of the support base 15a supports a shaft (not shown) attached between the short diameters of the segment S in the up-down direction, and horizontally extends about 90 degrees around the shaft (not shown). ° It is possible to turn. Therefore, in this example, the segment S is pulled up and down into an elliptical flat state, loaded into the shield shell 3a of the rear portion 3 by the segment loading cart 15, and then restored to a perfect circle, and then approximately 90 degrees in the horizontal direction. ° Turn. Subsequent operations are the same as those in the above-described embodiment, and thus description thereof is omitted.

Although the embodiment of the shield machine according to the present invention has been described above, the embodiment can be implemented as follows.

A) The excavator is constituted by a single body without connecting the rear portion 3 to the main body 2 so as to be swingable in the horizontal direction, and the shield jack 9 is disposed rearward at the rear portion.

B) Use a muddy shield excavator instead of the mud pressure type. In this case, the end of the mud feeding pipe faces the cutter chamber 5a and is connected to the bulkhead 5b, and the end of the mud drain pipe similarly faces the cutter chamber 5b and is connected to the bulkhead 5c. An opening / closing valve is provided in the middle of the mud pipe and the mud pipe, respectively, and when the segment S is carried in, the mud pipe and the mud pipe at positions where the carrying is obstructed are removed and separated. After carrying in, connect mud pipes and mud pipes.

C) As a connecting structure of the segments S, for example, a small-diameter portion having a step in the radial direction is formed at one end, and a large-diameter opening into which the small-diameter portion can be fitted is formed at the other end. I do. Alternatively, a connecting ring having a narrow width is projected to one side and welded to the inner peripheral surface at one end of the single segment S,
The end of another single segment S is fitted around the connecting ring and connected.

D) Of the plurality of shield jacks 9,
A jack 9B for pressing the contact piece Sa of the segment S is disposed at a position where the piston rod 9a passes through the inside of the segment S, and a jack 9A for pressing the front end face of the segment S is disposed at a position outside the jack 9B. I do.

[0039]

As is apparent from the above description,
The shield machine according to the present invention has the following excellent effects.

(1) Since the excavator can be prevented from retreating due to earth pressure or muddy water pressure while not obstructing the loading of the segment, an integrated elastically deformable ring-shaped segment is used. Circular tunnels can be drilled while building segment walls. Further, since the integrated segment is used, unlike the related art, there is no need to fix the divided segment pieces with bolts, so that the construction of the segment is simple, and there is no risk of water leakage due to poor fastening or the like.

(2) In the shield machine according to the second aspect,
Since the rear bogie equipped with the starting device is not required, the segments can be smoothly and quickly loaded into the excavator.

(3) In the shield machine according to the third aspect,
When the tunnel is bent in the horizontal direction, it is easy to carry the segment into the rear of the excavator,
The work of connecting the carry-in segment to the existing segment can also be performed smoothly.

(4) In the shield machine according to the fourth aspect,
The segment in the flat state can be easily and smoothly carried into the excavator, and after being carried in, the segment can be easily turned in a predetermined direction to be ready in a short time so that the segment can be connected to the existing segment.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an embodiment of a shield machine according to the present invention.

FIG. 2 is a plan sectional view showing the shield machine shown in FIG. 1;

3A is a sectional view taken along line AA of FIG. 1, FIG. 3B is a sectional view taken along line BB of FIG. 1, and FIG. 3C is a sectional view taken along line CC of FIG. .

FIG. 4 is an enlarged partial cross-sectional view showing a portion A in FIG. 1;

5 (a) and 5 (b) are partial front views sequentially showing steps of excavation and segment construction by the shield excavator of FIG. 1.

6 (c) and 6 (d) are partial front views sequentially showing the steps of excavation and segment construction by the shield excavator of FIG. 1 following FIGS. 5 (a) and 5 (b).

FIG. 7 (c) shows another embodiment of the shield machine.
It is sectional drawing corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Main body (front part) 2a, 3a Shield shell 3 Rear part 5 Cutter disk 8 Screw conveyor device 9, 9A, 9B Shield jack 9a Piston rod 10 Starting device 15 Segment carrying truck 16 Roller conveyor device 17 Attachment bar 18 Press Tool SS ・ Segment Sa Contact piece

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-191899 (JP, A) JP-A-54-58920 (JP, A) Japanese Patent Publication No. 8-19836 (JP, B2) (58) Field (Int.Cl. ⁶ , DB name) E21D 11/40

Claims (4)

(57) [Claims] 1. An integrated elastically deformable ring-shaped segment having a predetermined width and continuous in the circumferential direction is carried into an excavator in a state of being flattened in an elliptical shape, and then the segment is restored to a circular shape and the excavation direction is set. A shield excavator that excavates while constructing a segment wall by connecting to a plurality of shield jacks that are circumferentially spaced apart from each other at a rear part in a cylindrical shield shell of the excavator; Some jacks of the shield jack,
Arranged radially inward from the inner diameter of the circular segment, the rear end of the jack is configured to be able to press a contact piece projecting inward from the inner peripheral wall of the segment. Attachment bar extending from the end along the inner peripheral surface of the shield shell to the outside of the circular segment extends rearward, and at the rear end of the bar, a pressing tool capable of pressing the end surface of the segment. One end is pivotally supported between a radially inward right-angle bending position and an extended rearwardly extending position of the bar, and biases the pressing tool to bend radially inward. A shield excavator for an integrated segment, characterized in that: 2. The shield excavator for an integral segment according to claim 1, wherein a starting device such as a cutter disk drive, an oil tank, and an operation panel is provided in the excavator. 3. A rear portion of the excavator is divided into a main body portion in front of the excavator, and the divided rear portion is connected to the main body portion so as to be swingable in a horizontal direction. 3. A shield excavator for an integral segment according to claim 1, wherein the shield excavator is disposed rearward through the rear portion. 4. A supporter for extending a segment supporter from a front end of a self-propelled carriage toward the front, and rotatably supporting an oval-shaped segment on the front end of the segment supporter. The shield excavator for an integral segment according to any one of claims 1 to 3, further comprising a segment carrying truck provided with a segment.