JPH0768854B2 - Sealed shield machine tip inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention is applicable to a tip inspection device for a sealed shield machine such as an earth pressure type or a muddy type.

<< 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 the wear and damage of the cutter bit, there is an ultrasonic diagnostic type wear detecting device disclosed in, for example, Japanese Patent Laid-Open No. 60-144607, but it is indirect, and the detection is provided in parallel with the cutter bit. Since the wear of the cutter bit is detected and replaced with the wear degree of another cutter bit, the wear of the cutter bit is estimated from the detection result, and the 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 fluid-tight or air-tight and slidably inserted sheath tube in the seal tube, and the tip portion of the sheath tube By supplying pressurized air to the endoscope inserted projectingly and the chamber 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 chamber or the front surface 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,
A cavity is formed in the front of the chamber or the cutter by the pressurized air supply means, and after securing a field of view suitable for inspection, the sheath tube is inserted into the cavity through the seal tube connected to the opening / closing means, The endoscope inserted into the sheath tube is moved back and forth and rotated in the cavity. 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 pipe 26a, one end of which is connected to the flange of the opening / closing valve 22, and a sheath pipe 26 which is inserted into the seal pipe 26a via a seal material 26b so as to be liquid-tight or air-tight and slidable.
c and the endoscope 26d with the distal end protruding through the sheath tube 26c.
It consists of and.

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.

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 while the open / close valve 22 is closed, and the seal tube 26a is attached.

Then, the sheath tube 26c in which the endoscope 26d is inserted into the seal tube 26a
The sheath tube 26c is advanced with the opening / closing valve 22 opened, the distal end portion of the endoscope 26d is positioned in the hollow portion, and the sheath tube 26c is gradually advanced or rotated to move the chamber inside the chamber 16. Observe.

When the observation is completed, the tip of the endoscope 26d is retracted to the rear of the opening / closing valve 22, the opening / closing valve 22 is closed, and the sealing tube 26 is closed.
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 hollow portion A is also formed around the cutter bit 12a. To ensure the formation of the hollow portion A, for example, , The shield machine may be retracted a little 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.

FIG. 4 shows another embodiment of the present invention. In the embodiment shown in FIG. 4, the inside of the chamber 16 and the cutter bit 12a are washed prior to the observation by the endoscope 26d.

Therefore, in this embodiment, when the cavity A is formed and the seal pipe 26b is attached to the opening / closing valve 22, the water pipe 28 having the same diameter as the sheath pipe 26c is liquid-tight and slidable on the seal pipe 26a. It is movably inserted, and the opening / closing valve 22 is opened to advance to the cavity A, and jet water is jetted from the tip of the water supply pipe 28.

Then, with jet water, inside the chamber 16 or the cutter bit
The sheath tube 26c is inserted into the seal tube 26a in a state where the 12a is cleaned, and these observations are performed by the endoscope 26d.

In this way, by observing the inside of the chamber 16 and the cutter bit 12a with jet water, the wear state of the cutter bit 12a can be more accurately confirmed by observing.

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.

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, the sheath tube is inserted into the cavity through the seal tube connected to the opening / closing means, and the endoscope inserted through the sheath tube in the cavity is moved back and forth and rotated. As a result, the adhesion of soil in the chamber, the wear and damage of the cutter bit, the soil condition of the cutting face,
Accurate and reliable survey observations such as collapse can be performed over a wide range. 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.
FIG. 4 is a cross-sectional view of the same device mounted on the on-off valve of FIG. 2, and FIG. 4 is an explanation of another embodiment of the device of the present invention. 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 pipe, 26c …… Sheath pipe 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 fluid-tight or air-tight and slidably inserted sheath tube in the seal tube, an endoscope having a distal end projectingly inserted in the sheath tube, and pressurized air is supplied into the chamber to supply muddy water. And a pressurized air supply means capable of forming a cavity in the front face of the chamber or the cutter by lowering the water level to a position below the opening / closing means. apparatus.