JPH11336475A - Closed face type shield propulsion machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety of work at a closed part on the side of a cutting face, corresponding to closed face type shield propulsion machines of various kinds, by surely checking conditions of a cutting face and natural grounds of walls of a tunnel and conditions of spring water, with the naked eye. SOLUTION: A manhole 13 is provided to allow workers to enter and exit a bulkhead 8 formed between a cutter head and a front drum, and a manhole lid 14, which can be opened and closed, is mounted onto the inside of the manhole 13 by tightening bolts. An inspection hole 17 sufficiently smaller than the manhole 13 is provided on the lid 14 and an inspection lid 18 is attached onto the inside of the hole 17 through hinges 19 and an engaging member 20 so as to be opened and closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition wall between a face-side closed portion and an inside opening portion, which is provided with a manhole large enough for an operator to enter and exit, and a manhole cover covering the manhole is a soil of the closed portion. The present invention relates to a hermetically sealed shield machine mounted to withstand pressure.

[0002]

2. Description of the Related Art In a conventional sealed shield machine,
For example, when it is necessary to replace the cutter or remove obstacles on the face, it is necessary to drain the soil and water from the sealing section (cutter head) at the front of the excavator, and then open the sealing section and the open section inside the machine. The lid of the manhole provided on the partition wall is opened, an operator enters the cutter head from the manhole, and the above-described operation is performed.

[0003] Such an operation of the operator in the cutter head is extremely dangerous when the face is unstable. Normally, the operator injects a chemical solution to stabilize the face and then opens the manhole cover to open the manhole. Is to be entered.
The state of the sediment taken in the cutter head is detected by a pressure detector or the like, and it is determined whether or not the worker can enter.

[0004] In such an excavator, there is a problem that the operator cannot confirm the condition of the face face and the effect of the injection of the chemical solution with his / her own eyes, and open the manhole cover based on the detection value of the pressure detector. It is very uneasy for a worker to enter the cutter head.

In order to solve the above-mentioned problems, a transparent shield window is provided in a partition wall, and a sealed shield excavator capable of confirming the condition in the cutter head can be confirmed from the shield window. It is proposed in Japanese Patent Publication No. 111897.
As shown in a schematic sectional view (a) of FIG. 5 and a sectional view taken along the line D-D (b) of this shield machine 100, a partition wall between the face-side cutter head 101 and the inboard opening part 102 is provided. 103 is provided with a transparent viewing window 104, and a swing arm 106 to which a wiping tool 105 that slides on the viewing window 104 is attached.
Is supported on the cutter head 101 side. This axis 10
Along with attaching a rotation operation handle 108 to 7,
Water injection means 110 for injecting water onto the side of the cutter head 101 of the viewing window 104 is provided. In the shield machine 100, by rotating the shaft 107 from inside the machine via the handle 108, the wiping tool 105 attached to the swing arm 106 swings on the plate surface of the viewing window 104 and adheres. I'm trying to drop the mud that I do.

[0006]

However, in the tunnel machine 100 described in the above publication, the partition 103
When the earth pressure is applied, it becomes difficult to swing the swing arm 106 and the wiping tool 105, and the transparency of the viewing window 104 cannot be maintained, and the inside of the cutter head 101 cannot be confirmed. There is a problem. Further, since the wiping tool 105 and the swing arm 106 are provided on the cutter head 101 side of the partition wall 103, there is also a problem that earth and sand, rocks, and the like taken in from the front face are damaged by contact. Therefore, the tunnel machine 100 is mainly used as a muddy shield machine,
There is a problem that it cannot be used as an earth pressure shield machine.

The present invention has been made in order to solve such a problem, and can cope with various sealed shield excavators regardless of a muddy water type or an earth pressure type. It is an object of the present invention to provide a hermetically sealed shield machine capable of visually confirming the state of ground and spring water on a wall, and improving the safety of work at a face-side closed portion.

[0008]

Means for Solving the Problems and Action / Effect In order to achieve the above-mentioned object, a sealed shield machine according to the present invention comprises a partition wall between a face-side sealed portion and a machine-side open portion. A manhole of a size that can enter and exit, a closed shield excavator in which a manhole cover covering the manhole is attached so as to withstand the earth pressure of the closed part, in the required part of the bulkhead is sufficient compared to the manhole A small visual inspection hole is provided, and an inspection hole cover for covering the visual inspection hole is provided so as to be freely opened and closed.

In the present invention, before the worker opens the manhole cover and enters the face-side closed portion to perform the work, the cover for the inspection hole is opened to open the inspection hole for visual inspection, and the inspection hole for visual inspection is opened. A direct visual inspection of the sediment condition, the ground condition, the spring condition, and the like in the sealed portion is performed. Further, since the visual inspection hole is sufficiently smaller than the manhole, the opening and closing operation of the inspection hole cover is performed quickly.

According to the present invention, the safety of the worker when working inside the face-side closed portion can be confirmed directly by visual observation, so that the safety can be improved and the worker himself / herself can maintain the safety. Since the manhole cover can be opened after confirming the above, the worker's anxiety due to the manhole cover opening operation, which is a conventional problem, can be eliminated. It is also possible to check the ground condition by collecting earth and sand and gas in the sealed portion from the visual inspection hole.

Further, according to the present invention, since the opening / closing operation of the inspection hole lid can be performed promptly, there is a danger in the closed portion (when an operator cannot enter).
The inspection hole can be closed quickly.

In the present invention, the visual inspection hole is preferably provided on the manhole cover. By doing so, the condition of the ground near the manhole, where the worker enters and exits, can be checked, so that there is an effect that the work safety can be further improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a sealed shield machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a sealed shield machine 1 according to one embodiment of the present invention, and FIG.
A cross-sectional view is shown in FIG.

In the shielded shield machine 1 according to the present embodiment, the shield frame is a cylindrical front shield frame (hereinafter referred to as a "front body portion"), and corresponds to an inboard opening portion in the present invention. ) 2 and a cylindrical rear shield frame (hereinafter, referred to as a “rear body”) 3 disposed behind the front body 2. The front part of the rear trunk part 3 is swingably fitted to the front trunk part 2 so as to be inscribed in the front trunk part 2, and the rear part (non-fitting part) of the rear trunk part 3 is a front trunk part. The diameter is enlarged to be the same as 2. The swing operation is performed by a swing jack 4 arranged so as to connect the front body 3 and the rear body. Further, a seal is provided on the swinging portion P between the front body portion 2 and the rear body portion 3,
The infiltration of water, earth and sand from the oscillating portion P is prevented.

A cutter head (corresponding to a face-side sealing portion in the present invention) 5 is rotatably mounted on a front portion of the front body portion 2, and a plurality of disk cutters 6 are provided on a front surface of the cutter head 5. A chamber 7 for taking in earth and sand from a face is provided on the back surface of the disk cutter 6. In addition, a bulkhead (corresponding to a partition in the present invention) is provided between the cutter head 5 and the front body 2.
8 are arranged. Further, a chemical solution injector 2a for injecting a chemical solution into the ground is provided on an inner periphery in front of the front trunk portion 2. The chemical injector 2a is also provided on the front surface of the cutter head 5, though not shown.

On the inner peripheral side of the rear body 3, a segment 1 is provided by an erector 9 disposed rearward of the rear body 3.
0 is assembled in a ring shape. In addition, on the inner peripheral surface of the rear body 2, the tip is a segment 1.
Plural shield jacks 1 that can be pressed against the end face
The shield jacks 11 are pressed against the front end face of the existing segment 10 to apply a propulsion reaction force to the rear trunk 3 from the segment 10.

An earth discharging device 12 for discharging earth and sand, water and the like taken into the chamber 7 backward is disposed so that the front end thereof is located in the chamber 7 of the cutter head 5. Further, a pressure detector (not shown) is provided in the chamber 7 of the cutter head 5, and the state of the earth and sand taken into the chamber 7 is detected by a signal from the pressure detector.

In this embodiment, as shown in FIG. 2, the bulkhead 8 is provided with a manhole 13 large enough for an operator to enter and exit, and a manhole cover 14 is provided around the manhole 13 so as to cover the manhole 13. Is attached by bolting. The manhole cover 14 has a hinge 15 attached to a lower portion, and handles 16 for opening and closing are attached to left and right portions of an upper portion. After the bolt is removed, the manhole cover 14 is pivotally opened about the hinge 15 by pulling the handle 16 backward (two-dot chain line in FIG. 1), and the manhole 13 is opened. Is done.

As shown in the front view (a) of FIG. 3 and the sectional view taken along the line BB of FIG. 3, the inspection hole 1 is sufficiently smaller than the manhole 13 on the manhole cover 14.
An inspection lid 18 is attached to the inside of the manhole cover 14 so as to cover the inspection hole 17. The inspection lid 18 has one side (the right side in this embodiment) attached to the manhole cover 14 via a hinge 19, and the other side (the left side in this embodiment) rotatably attached to the manhole cover 14. It is held down by a locking member 20 to be attached. The locking member 20 has a substantially rectangular shape, and the locking state with respect to the surface of the inspection lid 18 is released by rotating upward (or downward) by 90 ° (two-dot chain line in FIG. 3A). It has been. An opening / closing handle 21 is attached to the left side of the inspection lid 18. The inspection cover 18 pivots the locking member 20 to the position shown by a dashed line in FIG. 3 (a) to release the locking state, and pulls the handle 21 to the inside of the machine to thereby center the hinge 19 around the hinge 19. It is pivotally opened (FIG. 3 (b), two-dot chain line), and the inspection hole 17 is opened.

The sealed shield machine 1 thus constructed is advanced by pressing the shield jack 11 against the front end surface of the segment 10 while rotating the cutter head 5 to extend the shield jack 11. At this time, the excavated earth and sand taken into the chamber 7 by the rotation of the cutter head 5 is carried backward by the earth discharging device 12. Thus, the excavator 1 performs the excavation work on the ground.

During the excavation, if it becomes necessary for the operator to enter the chamber 7 of the cutter head 5, for example, to remove an obstacle or replace the disk cutter 6, the situation is detected by the pressure detector. After all of the soil, water, etc. taken into the chamber 7 is discharged and emptied, the locking member 20 is rotated by 90 ° to release the locking of the inspection cover 18 and the handle 21 is released. Is pulled, and the inspection lid 18 is opened. In some cases, it may be necessary to inject and harden a chemical into the ground by the chemical injector 2a depending on the soil condition obtained from the pressure detector.

In this way, the inspection hole 17 is opened, and the face at the forefront of the inspection hole 17 is visually observed by the operator.
From this visual observation, how much spring water from the ground is
The state of collapse of the ground, the state of the geology, the solidification state of the chemical solution, and the like are confirmed, and it is determined whether or not the worker can enter the chamber 7 and perform work. At this time, if it is determined that there is a danger in the ground condition or the spring condition, the inspection cover 18 is closed, the locking member 20 is turned 90 °, and the manhole cover 14 is pressed down to check the inspection hole 17. Is closed.

When it is determined from the inspection hole 17 that an operator can enter the vehicle, all bolts attached to the entire circumference of the manhole cover 14 are removed, and the handle 16 moves the manhole cover 14 downward. And the manhole 13 is opened. In this way, the worker enters the chamber 7 through the manhole 13 and the work is performed.

According to the present embodiment, whether or not an operator can enter the chamber is determined based on only information from a conventional pressure detector or the like.
Since the state of spring water and the state of solidification of the chemical solution can be directly visually checked, the soil of the excavated layer and the gas in the chamber 7 can be collected.
This has the effect of improving work safety in the interior. In addition, since the inspection hole 17 is provided on the manhole cover 14, it is possible to confirm the ground condition near the manhole 13 where the worker actually enters and exits.

Further, according to the present embodiment, the inspection lid 18 is sufficiently smaller than the manhole lid 14 and the opening / closing operation is easy, so that even if a danger is confirmed in the chamber 7, This has the effect of closing quickly and securely.

In the present embodiment, the inspection lid 18 is configured to rotate and open in the left-right direction. However, the invention is not limited thereto, and the inspection lid 18 may be configured to rotate and open in the vertical direction. .

In the sealed shield machine according to another embodiment of the present invention, as shown in FIG. 4, an inspection hole 17 'is provided slightly to the left (or to the right) from the center position on the manhole cover 14'. An inspection lid 18 'is slidably mounted on the inside of the machine above the inspection hole 17' so as to be openable and closable in the left-right direction. On the manhole cover 14 ', two slide rails 21 are disposed to slightly sandwich the inspection cover 18' from above and below and slide in the left and right direction slightly to the right (or to the left) from the center of the inspection hole 17 '. Slightly left of the center of the inspection hole 17 'and the inspection lid 1
A substantially rectangular locking member 20 'is rotatably provided at two locations above and below 8'. These locking members 20 'normally hold the inspection lid 18' against the manhole lid 14 ',
It is configured such that the presser is released by rotating it by 0 ° (two-dot chain line in FIG. 4A). This inspection lid 1
The structure other than the opening and closing mechanism 8 'is the same as that of the above embodiment.

In this embodiment, when inspecting the inside of the chamber 7 as described above, the locking member 20 'is rotated by 90 degrees to release the pressing of the inspection lid 18'.
8 'is leftward (rightward) along the slide member 21
Inspection hole 17 'is opened by the movement (2) (FIG. 4 (a), (b) two-dot chain line). With such a configuration, the same operation and effect as described above can be obtained.

In this embodiment, the inspection lid 18 'is configured to slide in the left-right direction. However, the invention is not limited thereto, and the inspection lid 18' may be configured to slide in the vertical direction.

In each of the above embodiments, the inspection hole and the inspection cover are provided on the manhole cover. However, the present invention is not limited to this, and the inspection hole and the inspection cover may be attached to the bulkhead.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIGS. 3A and 3B are a front view (a) and a cross-sectional view taken along line BB (b) of the manhole cover of the present embodiment.

FIG. 4 is a front view (a) of a manhole cover and CC of a sealed shield machine according to another embodiment of the present invention.
It is a line sectional view (b).

FIG. 5 is a schematic sectional view (a) and a sectional view taken along line DD (b) illustrating a conventional shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealed shield machine 2 Front trunk 2a Chemical liquid injector 3 Rear trunk 4 Oscillating jack 5 Cutter head 6 Disk cutter 7 Chamber 8 Bulkhead 9 Electa 10 Segment 11 Shield jack 12 Earth removal device 13 Manhole 14 Manhole cover 15 Hinge 16 Handle 17 Inspection hole (visual inspection hole) 18 Inspection lid (Inspection hole lid) 19 Hinge 20 Locking member 21 Handle 22 Slide rail

Claims (2)

[Claims] 1. A manhole of a size that allows an operator to enter and exit a partition wall between a face-side closed portion and an inboard opening portion,
In a closed shield excavator in which a manhole cover covering the manhole is attached so as to withstand the earth pressure of the sealed portion, a visual inspection hole sufficiently smaller than the manhole is provided in a required portion of the bulkhead, A sealed shield machine in which an inspection hole cover for covering the inspection hole is provided so as to be freely opened and closed. 2. The sealed shield machine according to claim 1, wherein the visual inspection hole is provided on the manhole cover.