JPH11280377A - Earth-pressure gauge fixture for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth-pressure gauge fixture for a shield machine, in which the pressure-receiving surface of an earth-pressure gauge for the shield machine can be protected from the earth pressure and impact force of soil and sand in a cutter chamber, by which the earth-pressure gauge can be replaced easily and safely from the machine inside and in which damage is prevented in spite of simple constitution and the frequency of replacing works is reduced. SOLUTION: The installation of a masking plate 32 between the pressure- receiving surface of an earth-pressure gauge 5 and soil and sand S as well as the interposition of an elastic body 33 between the masking plate 32 and the pressure-receiving surface and the mutual-fast sticking of these masking plate, pressure-receiving surface and elastic body are aimed at. An earth-pressure mounting seat 8 mounting the earth-pressure gauge 5 on a chamber partition wall 3, the elastic body 33 set up on the cutter chamber 4 side while being brought into contact with the pressure-receiving surface 11 of the earth-pressure gauge 5 and the masking plate 32 brought into contact with the elastic body 33 while being brought into contact with soil and sand S in the cutter chamber 4 are fitted at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth pressure gauge mounting device for a shield excavator, and more particularly to an earth pressure gauge mounting device for a shield excavator for mounting an earth pressure gauge for measuring an earth pressure in a cutter chamber in a shield excavator. Things.

[0002]

2. Description of the Related Art An installation structure of an earth pressure gauge in a conventional shield machine will be briefly described. FIG. 3 is a schematic cross-sectional view of a portion of the cutter 2 and the chamber partition 3 in the shield machine 1.
The earth pressure gauge 5 faces the cutter chamber 4 defined by the above. The earth pressure gauge 5 has an earth pressure gauge main body 6 and a mounting flange 7.

[0003] The earth pressure gauge main body 6 has a strain gauge or the like therein and is attached to an opening 9 of an earth pressure gauge mounting seat 8 welded and fixed to the chamber partition 3. That is, the mounting flange 7 is fixed to the chamber partition wall 3 by the mounting bolt 10.
To the earth pressure gauge mounting seat 8.

[0004] The earth pressure gauge 5 can measure the pressure (earth pressure) when the earth and sand S in the cutter chamber 4 comes into contact with the pressure receiving surface 11 of the earth pressure gauge main body 6 at a predetermined pressure.

In such a configuration, as the cutter 2 rotates, the earth S in the cutter chamber 4 is agitated and collides with the pressure receiving surface 11 of the earth pressure gauge 5, and as a result, the earth pressure gauge 5 is damaged by debris in the earth S. It is possible and should be replaced in case of damage. However, when the earth pressure gauge 5 is replaced, when the mounting bolt 10 is removed and the earth pressure gauge 5 is removed from the earth pressure gauge mounting seat 8 portion, the inside of the machine 12 opposite to the cutter chamber 4 across the chamber partition 3 and the cutter chamber 4 Since there is no partition portion between them, there is a problem that the earth and sand S in the cutter chamber 4 enters the inside of the machine 12 through the opening 9 and cannot be actually replaced.

FIG. 4 is a schematic sectional view showing another conventional mounting structure. In this mounting structure, the earth pressure gauge 5 is mounted on a rotating body 13 mounted on the chamber partition 3 and the rotating shaft of the rotating body 13 is rotated. The earth pressure gauge 5 can be rotated about 14. When the earth pressure gauge 5 retreats from the opening 9 to the inside of the machine 12 due to this rotation, another part of the rotating body 13 can close the opening 9 to cut off the cutter chamber 4 from the inside of the machine 12, and Exchange is possible. However, in such a configuration, there are problems that the device becomes large, the number of parts is large, and the cost is high.

FIG. 5 is a front view showing still another conventional mounting structure. In this mounting structure, the pressure receiving surface 11 of the earth pressure gauge 5 is covered to separate the pressure receiving surface 11 from the soil S in the cutter chamber 4. A rotatable lid member 15 is provided so as to protect the device, and the rotatable lid member 15 is rotatable around a rotary shaft 16. At the time of normal excavation (at the time of measurement), the cover member 15 is opened (the virtual line in the figure), and when the earth pressure gauge 5 is replaced, the cover member 15 is closed (the solid line in the figure). However, actually, there is a problem that the structure of the lid member 15 cannot withstand the impact force from the earth and sand S, and is likely to be broken down.

FIG. 6 is a front view showing another conventional mounting structure, and FIG. 7 is a schematic cross-sectional view of the same. This mounting structure is similar to the structure shown in FIG. Is provided. That is, the pressure receiving surface 11 of the earth pressure gauge 5 is on the cutter chamber 4 side (the earth and sand S side).
Although the pressure receiving surface 11 is protected from the earth and sand S by providing the protection rod 17 on the front surface, there is an obstacle in front of the pressure receiving surface 11, which causes a problem of pressure detection. is there. There is also a problem that the earth and sand S may enter the concave portion between the pressure receiving surface 11 and the protection rod 17 and cause clogging.

In addition to the above, for example, Japanese Utility Model Laid-Open No. 1-1205
In No. 94, a contact plate is provided on the cutter chamber side of the pressure receiving surface of the earth pressure gauge, and an oil chamber is formed between the contact plate and the pressure receiving surface, and oil of a predetermined pressure is filled, and the earth pressure is applied to the pressure receiving surface. In addition to being able to transmit, the earth pressure gauge can be protected by a patch. However, there is a problem that the structure is complicated, the number of parts is large, and the cost is high. Further, it is necessary to remove the backing plate in connection with the work of replacing the earth pressure gauge, and as in the case of the mounting structure shown in FIG. 3, the intrusion of earth and sand is not considered.

Further, Japanese Utility Model Laid-Open No. 2-47288 employs a double pipe structure in which an outer pipe having a ball valve and an inner pipe which is movable within the outer pipe are employed. An earth pressure gauge is attached to the piping so that the earth pressure gauge can be drawn to the ball valve position when replacing the earth pressure gauge. However, there is a problem that the outer diameter is increased due to the double piping structure of the outer pipe and the inner pipe, which increases the size of the apparatus, and that it is necessary to use a smaller diameter earth pressure gauge to cope with this.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a soil excavator that can easily and safely replace an earth pressure gauge of a shield excavator from inside the machine. It is an object to provide a pressure gauge mounting device.

Another object of the present invention is to provide an earth pressure gauge mounting device for a shield machine which can protect the pressure receiving surface of the earth pressure gauge from the earth pressure of earth and sand in the cutter chamber and its impact force.

The present invention has a simple structure,
An object of the present invention is to provide an earth pressure gauge mounting device for a shield machine which is hardly damaged and requires less replacement work.

[0014]

That is, according to the present invention, a shield plate is provided between a pressure receiving surface of earth pressure gauge and earth and sand, and an elastic body is interposed between the shield plate and the pressure receiving surface. An earth pressure gauge mounting device for a shield excavator that attaches an earth pressure gauge to an opening of a chamber partition facing a cutter chamber in a shield excavator, wherein the earth pressure gauge is attached to the chamber partition. A pressure gauge mounting seat, an elastic body made of rubber or the like provided on the cutter chamber side in contact with the pressure receiving surface of the earth pressure gauge, and a shielding plate made of stainless steel or the like in contact with the elastic body and in contact with earth and sand in the cutter chamber. And an earth pressure gauge mounting device for a shield machine.

A stopper step is formed on the earth pressure gauge mounting seat, and an engaging flange engageable with the stopper step is formed on a peripheral edge of the shield plate. A sealing member such as an O-ring can be provided.

In the earth pressure gauge mounting device of the shield machine according to the present invention, the pressure of the earth and sand in the cutter chamber is transmitted to the pressure receiving surface of the earth pressure gauge via the shield plate and the elastic body. The earth pressure gauge and its pressure-receiving surface can be protected by the shield plate while maintaining the pressure measurement action. In addition, since the shield plate transmits pressure to the pressure receiving surface of the earth pressure gauge via the elastic body, even if an excessive earth pressure acts, it can be buffered by the elastic body and transmitted to the pressure receiving surface.

Further, if a stopper step is formed in the earth pressure gauge mounting seat of the earth pressure gauge, the engaging flange of the shielding plate is engaged with the stopper step to prevent movement into the machine, so that the opening is closed. Can be maintained. In addition, a seal member can prevent water from entering the machine from the cutter chamber side, and even if the earth pressure gauge is removed from the earth pressure gauge mounting seat, earth and sand and water will not enter the machine easily and safely. Can be exchanged.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An earth pressure gauge mounting device 30 for a shield machine according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIGS. 3 to 7 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows an earth pressure gauge mounting device 30 of the shield machine 1.
Front view from the side of the cutter chamber 4 of FIG.
FIG. 3 is a cross-sectional view, showing the earth pressure gauge mounting device 30 including the earth pressure gauge mounting seat 8, a shielding plate mounting seat 31, a shielding plate 32,
The elastic body 33, the sealing member 34, and the mounting bolt 1
0.

The shield plate mounting seat 31 is made of, for example, stainless steel or other material having a required rigidity and rust prevention effect, and is fixed to the earth pressure gauge mounting seat 8 by mounting bolts 35.

The shielding plate 32 is also made of, for example, stainless steel, and has an O-ring or other sealing member 34 interposed between the shielding plate 31 and the opening of the shielding plate mounting seat 31. This is fitted in the part 36. The shielding plate 32 has an engaging flange 37 protrudingly formed on the periphery thereof on the earth pressure gauge 5 side from the sealing material 34, and can be engaged with a stopper step 38 formed on the earth pressure gauge mounting seat 8.

The elastic body 33 is made of, for example, urethane rubber, and is in contact with both the back surface of the shielding plate 32 and the pressure receiving surface 11 of the earth pressure gauge 5. That is, the pressure receiving surface 1 of the shielding plate 32, the elastic body 33, and the earth pressure gauge 5
1 have a structure in which they are in close contact with each other.

In the earth pressure gauge mounting device 30 of the shield machine 1 having such a configuration, the earth pressure of the earth and sand S received from the inside of the cutter chamber 4 by the shielding plate 32 is uniformly applied to the pressure receiving surface 11 of the earth pressure gauge 5 via the elastic body 33. To communicate. That is, the pressure can be accurately transmitted through the elastic body 33.

The shielding plate 32 itself protects the pressure receiving surface 11 of the earth pressure gauge 5. In addition to this, the elastic body 33 buffers an excessive impact force generated in the cutter chamber 4 from the inside of the cutter chamber 4, and 11 can be further enhanced. Therefore, the frequency of failure of the earth pressure gauge 5 can be reduced.

When replacing the earth pressure gauge 5, the earth pressure gauge 5 can be easily removed from the earth pressure gauge installation seat 8 by removing the mounting bolt 10 from the earth pressure gauge installation seat 8. At this time, the engaging flange 37 of the shielding plate 32 engages with the stopper step 38 of the earth pressure gauge mounting seat 8 and the shielding plate 3
2 is prevented from moving in the cabin 12 direction.
Numeral 6 can maintain the closed state, so that the intrusion of the earth and sand S into the cabin 12 can be avoided, and the intrusion of water can be prevented by the seal member 34 so that the water can be stopped. That is, at the time of replacing the earth pressure gauge 5, the operation can be performed easily and safely without worrying about the intrusion of the soil S and the water.

[0025]

As described above, according to the present invention, since the shield plate and the elastic body are interposed on the front side of the earth pressure gauge so as to be in contact with each other, the pressure receiving surface of the earth pressure gauge is protected and the failure frequency is reduced. In addition to being able to reduce the number, the earth pressure gauge can be easily replaced simply by removing the mounting bolt, and can be safely performed without worrying about intrusion of earth and sand or water. Furthermore, since the structure is simple and the number of parts is small as compared with the conventional replaceable earth pressure gauge, it can be manufactured relatively small and at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of an earth pressure gauge mounting device 30 of a shield machine according to an embodiment of the present invention as viewed from a cutter chamber 4 side.

FIG. 2 is a sectional view of the same.

FIG. 3 is a schematic cross-sectional view showing a mounting structure of an earth pressure gauge 5 in the conventional shield machine 1 and showing a cutter 2 and a chamber partition 3 in the shield machine 1;

FIG. 4 is a schematic sectional view showing another conventional mounting structure.

FIG. 5 is a front view showing still another conventional mounting structure.

FIG. 6 is a front view showing still another conventional mounting structure.

FIG. 7 is a schematic sectional view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Cutter 3 Chamber partition 4 Cutter chamber 5 Earth pressure gauge 6 Earth pressure gauge main body of earth pressure gauge 5 7 Mounting flange of earth pressure gauge 5 8 Earth pressure gauge mounting seat 9 Opening of chamber bulkhead 3 10 Mounting bolt 11 Earth pressure gauge 5 Pressure receiving surface 12 Inside the machine 13 Rotating body (Fig. 4) 14 Rotating shaft 15 Lid member (Fig. 5) 17 Bar material for protection (Fig. 6) 30 Earth pressure gauge mounting device for shield machine (Embodiment, Fig. 1) 31 Stainless steel Shielding plate mounting seat made of material 32 Shielding plate made of stainless steel 33 Elastic body made of rubber material 34 O-ring or other sealing member 35 Mounting bolt 36 Opening of shielding plate mounting seat 31 37 Engagement flange of shielding plate 32 38 Sat Stopper step of pressure gauge mounting seat 8 S Sand in cutter chamber 4

Claims (2)

[Claims] 1. An earth pressure gauge mounting device for a shield excavator for mounting an earth pressure gauge on an opening of a chamber partition facing a cutter chamber in a shield excavator, the earth pressure gauge mounting seat for mounting the earth pressure gauge on the chamber partition. A shield excavator, comprising: an elastic body provided on the cutter chamber side in contact with a pressure receiving surface of the earth pressure gauge; and a shield plate in contact with the elastic body and in contact with earth and sand in the cutter chamber. Earth pressure gauge mounting device. 2. A stopper step is formed on the earth pressure gauge mounting seat, and an engaging flange engageable with the stopper step is formed on a peripheral edge of the shielding plate, and the cutter chamber is formed from the engaging flange. The earth pressure gauge mounting device for a shield machine according to claim 1, wherein a seal member is provided on the side.