JPH0768855B2 - Sealed shield machine tip inspection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tip inspection device for an earth pressure type or muddy type sealed shield machine.

<< Background of the Invention and its Problem >> In a sealed shield machine such as a mud pressure type or a mud pressure type,
For some reason, you may be unable to dig during shield digging.

The causes are adhesion of earth and sand in the pressure chamber chamber, obstacles in front of the cutter, wear and damage of the cutter bit, and generation of cavities due to ground collapse.

When such a situation occurs, pressure is applied to the front side of the partition wall due to muddy water or filled mud, so that the situation inside the chamber chamber in front of the partition wall is facilitated. Could not be observed.

In addition, the front surface of the cutter could not be visually observed, and the wear or damage of the cutter bit could not be directly detected.

As a means for detecting wear and damage of the cutter bit, for example, there is an ultrasonic diagnostic type wear detecting device shown in JP-A-60-144607, but it is indirect and is provided in parallel with the cutter bit. Since the wear of the detection bit is detected and replaced with the degree of wear of another cutter bit, the wear of the cutter bit is estimated from the detection result, and an accurate wear state cannot be detected.

This invention was made based on the above background,
It is an object of the present invention to provide a tip inspection device for a shield machine, which is capable of performing an inspection with an endoscope even in a pressurized tip portion of the shield machine.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has a shield machine having a cutter that is rotationally driven at its tip, and defining a chamber chamber by a partition wall provided on the back side of the cutter. In the above, the opening / closing means attached to the partition wall, the seal tube connected to the opening / closing means, the pressure-resistant tube which is liquid-tightly or air-tightly and slidably inserted in the seal tube, and at least the transparent end portion of which is transparent. By supplying pressurized air into the endoscope inserted into the tube and the chamber, the water level of the muddy water is lowered to a position below the opening / closing means to form a cavity in the chamber or the front of the cutter. And a pressurized air supply means capable of

<< Operation >> According to the tip inspection device of the sealed shield machine having the above configuration,
By forming a cavity in the front of the chamber or the cutter by the pressurized air supply means and ensuring a field of view suitable for inspection, a pressure resistant tube with a transparent tip is provided in the cavity through a seal tube connected to the opening / closing means. The endoscope inserted into the pressure resistant tube is moved back and forth and rotated in the hollow portion.
As a result, it is possible to accurately and surely perform a wide range of investigations and observations such as the state of adhesion of earth and sand in the chamber, the wear and damage of the cutter bit, the soil condition of the cutting face, and the collapse.

<< Embodiment >> An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the entire construction of a muddy water pressure type shield machine to which the inspection device of the present invention is applied.

The shield machine shown in the figure has a cylindrical body with open ends.
The main body 10 includes a cutter 12, a cutter 12 rotatably attached to an opening on the tip side of the main body 10, and a partition wall 14 fixed to the main body 10 at a predetermined distance on the back side of the cutter 12. A chamber 16 is defined on the tip side of the.

A large number of cutter bits 12a are fixed to the front surface of the cutter 12.

A mud pipe 18 for supplying pressurized mud into the chamber 16 is connected to the upper side of the partition wall 14, and a mud pipe 20 for discharging the excavated earth and sand together with the mud is provided to the lower side of the partition wall 14. Are connected.

Further, the mud pipe 18 is connected to a pressurized air supply means capable of supplying pressurized air into the chamber 16 as described later.

An opening / closing valve 22 as an opening / closing means is attached to the partition wall 14 below the mud pipe 18.

The mounting state of the on-off valve 22 is shown in FIG.

The opening / closing valve 22 is composed of a ball valve or a gate valve, and is closed in a steady state such as when the shield machine is driven forward, and a blind lid 24 is attached.

An inspection device 26 shown in FIG. 3 is attached to the open / close valve 22 with the blind lid 24 removed when observing the chamber 12 and the bit 12a of the cutter 12.

The inspection device 26 includes a seal tube 26a, one end of which is connected to the blange of the opening / closing valve 22, and both ends of which are open, and a pressure-resistant tube which is inserted into the seal tube 26a through a seal member 26b so as to be liquid-tight or air-tight and slidable. 26c and the endoscope 26 inserted in the pressure resistant tube 26c.
It consists of d and.

The pressure-proof tube 26c has an open rear end and is closed at the front end side, and at least the front-end side portion is made of transparent pressure-resistant glass or the like so that light can be transmitted.

A television monitor, an image analysis device, a light source device, and the like are connected to one end of the optical fiber of the endoscope 26d.

A plurality of guide rods 26e for guiding the pressure resistant tube 26c are provided between the rear end of the seal tube 26a and the rear end of the pressure resistant tube 26c at intervals in the circumferential direction.

In addition, a plurality of water jet water supply pipes 28 for cleaning the pressure resistant pipes 26 are provided in the vicinity of the mounting portion of the opening / closing valve 22 to the partition wall 14.

Next, a method of mounting the inspection device 26 will be described. When observing the inside of the chamber 16, the shield machine is first stopped to lower the water level of the muddy water inside the chamber 16 to below the opening / closing valve 22.

In this case, pressurized air is injected from the mud pipe 18 to partially form the cavity portion A having a pressure slightly higher than the face pressure.

In this case, if the inflow of groundwater is small and the stability of the face and surrounding ground can be maintained, it is not always necessary to form the cavity A by using the pressurized air.

Further, also in the mud pressurization type sealed shield machine, the earth and sand in the chamber are removed to form the hollow portion A in the same manner as described above.

When the cavity A is formed, the blind lid 24 is removed with the open / close valve 22 closed, and the seal tube 26a is attached.

Then, the pressure resistant tube 26c with the endoscope 26d inserted in the seal tube 26a is inserted while being guided by the guide rod 26e,
After that, the pressure-resistant tube 26c is moved forward with the opening / closing valve 22 opened, the distal end portion of the endoscope 26d is positioned in the cavity A, and the pressure-resistant tube 26c is gradually moved forward or rotated to move the chamber inside the chamber 16. Observe.

At this time, jet water is injected from the supply pipe 28 to
It is desirable to clean the especially transparent parts of 26c.

When the observation is completed, the tip of the pressure resistant pipe 26c is retracted to the rear of the open / close valve 22, and the open / close valve 22 is closed to close the seal pipe 26.
Remove a.

On the other hand, when observing the wear state of the cutter bit 12a of the cutter 12, first, the position of the opening / closing valve 22 and the slit hole of the cutter 12 for taking in the sediment are matched.

In this state, when pressurized air is sent into the chamber 16 to lower the water level of the muddy water, the cavity A is formed around the cutter bit 12a as well. To ensure the formation of the cavity A, For example, the shield machine may be slightly retracted while feeding pressurized air.

After the cavity A is formed, the subsequent operations are performed in the same manner as the observation inside the chamber 16.

In the observation of the degree of wear of the cutter bit 12a, the cutter 12 may be rotated to sequentially observe the bits 12a provided corresponding to the slit holes.

Although the partition 14 is provided with one opening / closing valve 22 in the above embodiment, the embodiment of the present invention is not limited to this. Observation with the mirror 26d may be performed at a plurality of locations.Furthermore, one opening / closing valve is equipped with a water jet water jet pipe in a liquid-tight and slidable manner.
Prior to the observation, the chamber 16 and the cutter bit 12
By cleaning a and observing them with the endoscope 26d, a more accurate and reliable situation can be grasped.

Further, the opening / closing means to which the seal pipe 26a is connected is not limited to the opening / closing valve 22. For example, a shutter-shaped member may be used to open / close between the seal pipe 26a and the chamber 16.

<< Effects of the Invention >> As described in detail above, according to the tip inspection device for the hermetically sealed shield machine according to the present invention, a cavity is formed in the chamber chamber or the front surface of the cutter by the pressurized air supply means for inspection. After securing a suitable field of view, a pressure resistant tube having a transparent tip is inserted into the cavity through a seal tube connected to the opening / closing means, and the endoscope inserted into the pressure tube is moved back and forth in the cavity. Rotate. As a result, it is possible to accurately and surely perform a wide range of investigations and observations such as the state of adhesion of earth and sand in the chamber, the wear and damage of the cutter bit, the soil condition of the cutting face, and the collapse. Then, when repair is necessary by observing the situation, it can be used as a preliminary observation before the worker enters the chamber or as a confirmation monitor of the work.

[Brief description of drawings]

FIG. 1 is an explanatory view of a shield machine to which the device of the present invention is applied,
FIG. 2 is a sectional view of an opening / closing valve to which the same device is attached, and FIG.
The figure is a cross-sectional view of the same apparatus mounted on the on-off valve of FIG. 10 …… Shield machine main body 12 …… Cutter 12a …… Cutter bit 14 …… Differential wall, 16 …… Chamber chamber 22 …… Opening / closing valve, 26 …… Inspection device 26a …… Seal tube, 26c …… Pressure resistant tube 26d …… Endoscope, A ... cavity

Claims (1)

[Claims] 1. A shield machine having a cutter, which is driven to rotate, at its tip, and which defines a chamber by a partition provided on the back side of the cutter, and an opening / closing means attached to the partition and the opening / closing means. A seal tube connected to
A pressure-resistant tube having at least a distal end portion transparently inserted into the seal tube so as to be liquid-tight or air-tight and slidable, an endoscope inserted into the pressure-resistant tube, and pressurized air is supplied into the chamber. A tip of a hermetically sealed shield machine, further comprising: pressurized air supply means capable of lowering the water level of the muddy water to a position below the opening / closing means to form a cavity in the front of the chamber or the cutter. Inspection device.