JP2010121406A - Replacement type soil pressure measuring device for shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a replacement type soil pressure measuring device for a shield machine, enabling the presence or absence of flush to be confirmed before a sensor body is replaced. <P>SOLUTION: This replacement type soil pressure measuring device includes: a base 13 which is attached to a mounting hole 5 extending through a partition wall 3 for partitioning a facing side and a mine inner side and has a spherical recess 11 and a communication hole 12 formed by communicating the facing side with the mine inner side in the recess 11; a sensor holding body 15 which comprises a spherical projection 14 matching the recess 11 and supported on the base 13 rotatably between a normal rotating angle and a rotating angle in replacement; a sensor mounting hole 26 which allows the facing side to communicate with the mine inner side when the sensor holding body 15 is at the normal rotating angle and is closed by the inner surface of the recess 11 when the sensor holding body 15 is at the rotating angle in replacement, and the sensor body 27 detachably supported in the sensor mounting hole 26. The base 13 includes a communication passage 37 for confirmation of flush water, one end 37a of which is opened to the inner surface of the recess 11 and the other end 37b of which is opened to the mine inner side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shield type excavator exchanging earth pressure measuring device for measuring earth pressure in front of a bulkhead, and in particular, exchanging type earth pressure measurement of a shield excavator capable of confirming the presence or absence of water discharge before exchanging a sensor body. Relates to the device.

  The shield machine has a cylindrical shield frame, a partition that divides the shield frame back and forth into the face side and the inside of the well, a cutter that is provided on the partition and cuts the face, and earth and sand cut by the cutter are placed in front of the partition. A soil removal device (screw conveyor, etc.) that transports from the (face side) to the rear (inside of the mine), an erector that assembles the segments in a ring shape within the shield frame, and a shield frame that takes reaction force against the segments assembled by the erector And a shield jack that moves forward.

  A mounting hole is formed in the partition wall so as to penetrate the partition wall, and an earth pressure gauge for measuring an earth pressure in front of the partition wall (a so-called earth pressure in the cutter chamber) is provided in the mounting hole. And by controlling the extension speed of the shield jack, the rotation speed of the screw conveyor, etc. according to the detection value of the earth pressure gauge, the earth pressure in the cutter room is kept within a predetermined range, and the face is stabilized. . If the earth pressure in the cutter chamber exceeds a predetermined range and is too high, the ground surface may be raised, and if the earth pressure in the cutter chamber is below the predetermined range and too low, the ground surface may be depressed.

  By the way, the earth pressure gauge may break down due to long-term use or contact with foreign matter (pebbles). In this case, the broken earth pressure gauge must be replaced with a new earth pressure gauge. Therefore, conventionally, a sensor holding body to which the sensor body for measuring the earth pressure is mounted is provided to be movable to the base portion attached to the mounting hole, and the sensor body is normally held at a position where the sensor body is exposed to the cutter chamber. The body was moved and the earth pressure in the cutter chamber was measured with the sensor body, and at the time of replacement, the sensor body was moved to a position where the sensor body was covered with the base, and the sensor body was replaced (Patent Document 1). reference).

JP-A-9-228776

  In such an exchange-type earth pressure measuring device, when the sensor main body is removed from the sensor holding body during replacement, if the groundwater is in front of the sensor main body, the sensor main body is removed from the sensor holding body and at the same time the groundwater Erupts into the mine. Therefore, when there is even a possibility of water discharge, it is necessary to perform a water stop treatment to harden the earth and sand by injecting a chemical into the cutter chamber, and the replacement work cannot be prolonged. Moreover, when such a water stop process cannot be performed, the replacement work may be abandoned.

  An object of the present invention created in view of the above circumstances is to provide a replaceable earth pressure measuring device for a shield machine capable of confirming the presence or absence of water discharge prior to replacement of a sensor body.

  In order to achieve the above object, the present invention is an exchange-type earth pressure measuring device for measuring earth pressure in front of a partition wall that partitions the inside of a shield frame of a shield machine into a face side and an inside of a shaft, and penetrates the partition wall. A base portion having a spherical concave portion and a communication hole formed by communicating the face side and the inner side of the concave portion with the concave portion, and a spherical convex portion coinciding with the concave portion. A sensor holder that is rotatably supported by the base between a rotation angle at a normal time and a rotation angle at the time of replacement, and the sensor holder is formed so as to penetrate the sensor holder. When the face side is connected to the inside of the pit, the sensor holding hole is closed by the inner surface of the recess when the sensor holding body is at the rotation angle at the time of replacement, and the earth pressure is detachably supported by the sensor mounting hole. A sensor body to be measured, and There are those that open to the inner surface of the recess and the other end provided with a communication passage for confirmation flooding opening to downhole side.

  A seal that is located behind the opening on the face side of the sensor mounting hole and stops water between the concave portion and the convex portion when the sensor holding body has a rotation angle at the time of replacement in the concave portion. One end of the communication passage may be opened on the inner surface of the recess that closes the opening on the face side of the sensor mounting hole when the sensor holding body reaches a rotation angle at the time of replacement.

  A pipe or hose may be connected to the opening on the inner side of the communication passage, and an open / close valve may be provided in the pipe or hose.

  A connecting member having a nipple for injecting grease may be connected to the on-off valve.

  According to the exchange type earth pressure measuring device of the shield machine according to the present invention, it is possible to confirm the presence or absence of water discharge before the replacement of the sensor body. Therefore, after confirming that there is no water discharge, the sensor body can be replaced without performing a water stop treatment, and can be replaced quickly.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a front view of a shield machine equipped with a replaceable earth pressure measuring device according to the present embodiment, and FIG. 2 is a side sectional view of the shield machine of FIG.

  The shield machine 1 is a cylindrical shield frame 2, a partition wall 3 that divides the shield frame 2 back and forth into the face side and the inside of the shaft, and is rotatably supported by the partition wall 3 and is driven to rotate by a drive device (not shown). A cutter 4 for cutting the face is provided, and a screw conveyor 5 for transferring the earth and sand cut by the cutter 4 from the front (face side) of the partition wall 3 to the rear (downhole side). In addition, the shield frame 2 is provided with an erector (not shown) for assembling the segment in a ring shape along the inner peripheral surface of the shield frame 2 and also applies a reaction force to the segment assembled by the erector. A shield jack (not shown) for advancing the shield frame 2 is provided.

  A mounting hole 3a is formed in the partition wall 3 so as to measure the earth pressure in front of the partition wall 3 (the earth pressure in the cutter chamber 6 between the cutter 4 and the partition wall 3). An exchangeable earth pressure measuring device 7 is provided. The exchange-type earth pressure measuring device 7 is shown in FIG. 2 as being disposed above the rotating shaft 8 of the cutter 4, but actually, one of the rotating shafts 8 of the cutter 4 is shown in FIG. 1. It is arranged on the side of. Further, another attachment hole 3b is formed through the partition wall 3 on the other side of the rotary shaft 8 of the cutter 4, and a fixed earth pressure measuring device 10 is provided in the attachment hole 3b. A control unit (not shown) controls the extension speed of the shield jack, the rotation speed of the screw conveyor 5 and the like in accordance with the detection values of the earth pressure measuring devices 7 and 10, so that the earth pressure in the cutter chamber 6 is kept within a predetermined range. In order to stabilize the face.

  3 is an enlarged view of a portion of the exchange-type earth pressure measuring device 7 of FIG. 2, FIG. 4 is a view taken along the line IV-IV in FIG. 3, FIG. 5 is a view taken along the line V-V in FIG. 4 is a cross-sectional view taken along the line VI-VI in FIG. 4, and FIG. 7 is a cross-sectional view of the exchange-type earth pressure measuring device 7 when the sensor holder 15 is rotated to the rotation angle at the time of exchange.

  The exchange-type earth pressure measuring device 7 includes a base portion 13 mounted in an attachment hole 3a formed through the partition wall 3, and a sensor holder 15 supported on the base portion 13 so as to be rotatable within a predetermined range.

  The base 13 is circular when viewed from the back as shown in FIG. 4, is formed in a substantially triangular shape when viewed from the side as shown in FIGS. 3 and 5, and is attached to the mounting hole 3a of the partition wall 3 by welding or the like. It is attached. A concave portion 11 formed in a spherical shape is provided in the base portion 13, and a communication hole 12 is formed in the concave portion 11 to communicate the face side of the partition wall 3 with the inside of the pit. The sensor holding body 15 has a spherical convex portion 14 coinciding with the concave portion 11, and is exchanged for a normal rotation angle (see FIG. 3) with the convex portion 14 fitted in the concave portion 11 of the base portion 13. It is possible to rotate between rotation angles (see FIG. 7).

  As shown in FIGS. 4 and 6, rotation shafts 16 are attached to both ends of the sensor holder 15, respectively. The rotary shaft 16 has a base end portion 16a attached to the sensor holding body 15 having a quadrangular cross section. The base end portion 16a is inserted into the mounting hole of the sensor holding body 15 and fixed by a bolt 17. ing. The intermediate portion 16b of the rotating shaft 16 is formed in a circular cross section, and is rotatably inserted into the bearing fitting 18. The bearing fitting 18 is fixed to the base portion 13 with bolts 19. The distal end portion 16 c of the rotating shaft 16 is formed in a hexagonal cross section, and is inserted into the mounting hole of the lever 20 and fixed by the bolt 21. Thereby, the sensor holding body 15 is rotated with respect to the base portion 13 by rotating the lever 20 around the rotation shaft 16.

  As shown in FIGS. 3 and 5, the left and right levers 20 have different mounting phase angles with respect to the rotating shaft 16. Each lever 20 is formed with a screw hole 22, and a bolt 23 is screwed into the screw hole 22. Each bolt 23 has a tip abutted against the partition wall 3 and functions as a stopper that prevents the lever 20 from rotating unexpectedly. These bolts 23 hold the sensor holder 15 so as not to move from the normal rotation angle with respect to the base 13. Further, by loosening the bolt 23 in FIG. 5 and screwing in the bolt 23 in FIG. 3, the sensor holding body 15 at the normal rotation angle in FIG. 3 rotates counterclockwise with respect to the base portion 13. It becomes the rotation angle at the time of replacement. The sensor holding unit 15 is provided with a stopper 24 for determining the position of the normal rotation angle and a stopper 25 for determining the rotation angle at the time of replacement.

  As shown in FIGS. 6 and 7, a sensor attachment hole 26 is formed through the sensor holder 15. 3 and 6, the sensor mounting hole 26 communicates the face side and the inside of the shaft when the sensor holding body 15 is at a normal rotation angle, and the sensor holding body 15 is exchanged as shown in FIG. 7. The sensor holding body 15 is formed so as to be closed by the inner surface of the recess 11 when the rotation angle is. The sensor mounting hole 26 includes a large-diameter portion 26a, a small-diameter portion 26b, and a step portion 26c. A sensor main body 27 for measuring earth pressure in the cutter chamber 6 in front of the partition wall 3 is provided in the sensor mounting hole 26. It is detachably supported. The sensor main body 27 has a flange 28 that comes into contact with the stepped portion 26c of the sensor mounting hole 26, and this flange 28 is detachably attached to the stepped portion 26c by a hexagon socket bolt 29. The flange 28 is provided with a ring-shaped water seal (such as a rubber O-ring) 30 that is pressed against the step portion 26c.

  As shown in FIGS. 6 and 7, the concave portion 11 of the base portion 13 is located behind the opening 26 d on the face side of the small diameter portion 26 b of the sensor mounting hole 26 when the sensor holding body 15 reaches the rotation angle at the time of replacement. The housing groove 31 is formed in a ring shape so as to surround the convex portion 14, and the housing groove 31 has a ring shape that stops water between the concave portion 11 and the convex portion 14. A seal (rubber O-ring or the like) 32 is accommodated. In addition, a dust seal 33 is attached in the vicinity of the communication hole 12 formed in the base portion 13 to prevent foreign matter in front of the partition wall 3 from entering the gap between the concave portion 11 and the convex portion 14 from the communication hole 12. . The dust seal 33 is formed in a ring shape from rubber, Teflon (registered trademark) or the like, and the press plate 34 formed in a ring plate shape is fixed to the base portion 13 with bolts 35 so that the dust seal 33 is attached to the base portion 13. Yes.

  As shown in FIG. 7, when the sensor holding body 15 reaches the rotation angle at the time of replacement, the base 13 is used to check whether or not groundwater has entered the space 36 at the front of the sensor body 27. A communication passage 37 for confirming water discharge is formed. The communication passage 37 has one end 37 a that opens to the inner surface of the recess 11 that communicates with the space 36, and the other end 37 b that opens to the inner side of the back surface of the base portion 13. That is, one end 37 a of the communication passage 37 opens to the inner surface of the recess 11 that closes the opening 26 d on the face side of the sensor mounting hole 26 when the sensor holding body 15 reaches the rotation angle at the time of replacement. The end 37 b is open to the inner side of the back surface of the base portion 13. A pipe 38 or a hose is connected to the other end 37 b of the communication passage 37, that is, an opening inside the pit, and an open / close valve 39 is provided in the pipe 38 or the hose. The on-off valve 39 is opened and closed by operating the lever 40. A connecting member 43 having a nipple 41 for injecting grease and a plug nut 42 is connected to the on-off valve 39.

  The operation of the present embodiment having the above configuration will be described.

  When the earth pressure in the cutter chamber 6 is measured by the exchange earth pressure measuring device 7 described above, the bolt 23 in FIG. 5 is tightened until the stopper 24 comes into contact with the base 13, and then the bolt 23 in FIG. Tighten until 13 abuts. As a result, the sensor holding body 15 is fixed at the normal rotation angle, and the sensor main body 27 faces the cutter chamber 6 as shown in FIG. 6, and the earth pressure in the cutter chamber 6 is detected by the sensor main body 27. be able to.

  When replacing the broken sensor body 27, the bolt 23 of FIG. 5 is loosened and the bolt 23 of FIG. 3 is screwed to rotate the sensor holder 15 counterclockwise in FIG. 3, as shown in FIG. Then, the sensor holder 15 is rotated counterclockwise until the stopper 25 comes into contact with the base portion 13. Thereby, the sensor holding body 15 is fixed at the rotation angle at the time of replacement, and the opening 26d on the face side of the sensor mounting hole 26 is closed by the inner surface of the recess 11.

  In FIG. 7, whether or not the groundwater has entered the front space 36 of the sensor body 27 through the gap between the dust seal 33 and the convex portion 14 from the cutter chamber 6 in front of the partition wall 3 is determined by removing the plug nut 42. This can be detected by opening the on-off valve 39. That is, the groundwater that has entered the space 36 in the front part of the sensor body 27 is prevented by the seal 32 from entering the pit through the gap between the concave portion 11 and the convex portion 14, so the plug nut 42 is removed and the on-off valve 39 is opened. If the groundwater spouts from the portion of the connecting member 43 from which the plug nut 42 is removed when it is opened, it can be determined that the groundwater has entered the space 36 in the front of the sensor body 27. It can be judged that there is no.

  In the former case, a water stop treatment is performed to solidify the earth and sand in the cutter chamber 6 by injecting a chemical (solidifying agent) into the cutter chamber 6, and the sensor main body 27 is replaced after the groundwater stops being ejected. In the latter case, the sensor body 27 is immediately replaced. Thus, since the presence or absence of water discharge can be confirmed prior to replacement of the sensor main body 27, in the latter case where it has been confirmed that there is no water discharge, the sensor main body 27 can be replaced without performing a water stop treatment. Can be replaced. In the latter case, since the earth pressure water pressure is not applied to the sensor main body 27, the zero point adjustment of the sensor main body 27 can be performed even if the sensor main body 27 is not broken down, and measurement with high accuracy is possible.

  As shown in FIG. 7, when the sensor holder 27 is rotated to the rotation angle at the time of replacement, the dust seal 33 is in a state where the convex portion 14 is in contact with the dust seal 33. Therefore, even if groundwater exists in the cutter chamber 6, the groundwater may not enter the space 36 in the front part of the sensor main body 27. Also in this case, the sensor main body 27 can be replaced without performing the water stop treatment. Therefore, the water stop treatment is required prior to the replacement of the sensor main body 27 when ground water exists in the cutter chamber 6 and the water stop function of the dust seal 33 is deteriorated.

  Further, by injecting grease from the nipple 41 for injecting grease provided in the connecting member 43, the grease is supplied between the concave portion 11 and the convex portion 14, and the sensor holding body 15 is exchanged for the normal rotation angle. While reducing the frictional resistance at the time of rotating with respect to the rotation angle of time, the water stop between the recessed part 11 and the convex part 14 may be improved.

  In the state of FIG. 7, when the ground water in the cutter chamber 6 has entered the space 36 in the front part of the sensor body 27, the earth pressure gauge (water pressure) is inserted into the grease nipple 41 with the plug nut 42 attached. If the sensor main body 27 is in a state of failure, the water pressure in the cutter chamber 6 can be detected.

  The pipe 38 may be omitted, and a plug nut attached to the other end 37b of the communication passage 37 in a normal state and removed in a water discharge test may be directly and detachably screwed.

It is a front view of the shield machine equipped with the exchange-type earth pressure measuring device concerning one embodiment of the present invention. It is a sectional side view of the shield machine of FIG. It is an enlarged view of the part of the exchange-type earth pressure measuring apparatus of FIG. It is the IV-IV line arrow directional view of FIG. FIG. 5 is a view taken along line VV in FIG. 4. It is the VI-VI sectional view taken on the line of FIG. It is sectional drawing of the exchange-type earth pressure measuring apparatus when rotating a sensor holding body to the rotation angle at the time of replacement | exchange.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Shield frame 3 Bulkhead 5 Mounting hole 7 Exchange-type earth pressure measuring device 11 Concave part 12 Communication hole 13 Base part 14 Convex part 15 Sensor holding body 26 Sensor mounting hole 26d Opening part 27 Sensor main body 32 Seal 37 Communication path 37a One end 37b Other end 38 Piping 39 On-off valve 41 Nipple 43 Connection member

Claims (4)

An exchange-type earth pressure measuring device that measures the earth pressure in front of a partition wall that partitions the shield frame of the shield machine into the face side and the inside of the mine shaft,
A base having a spherical recess and a communication hole formed by communicating the face side and the inner side of the recess with the mounting hole formed through the partition wall;
A sensor holding body having a spherical convex portion coinciding with the concave portion and supported on the base portion so as to be rotatable between a normal rotation angle and a rotation angle at the time of replacement;
The sensor holding body is formed to penetrate, and when the sensor holding body is at a normal rotation angle, the face side and the inner side of the shaft are communicated. When the sensor holding body is at a rotation angle at the time of replacement, the sensor holding body is blocked by the inner surface of the recess. Sensor mounting holes,
A sensor body that is detachably supported in the sensor mounting hole and measures the earth pressure,
An exchange-type earth pressure measuring device for a shield machine, characterized in that a communication passage for confirming water discharge is provided in the base, one end of which opens to the inner surface of the recess and the other end of which opens to the inside of the pit. A seal that is located behind the opening on the face side of the sensor mounting hole and stops water between the concave portion and the convex portion when the sensor holding body has a rotation angle at the time of replacement in the concave portion. Provided,
2. The shield machine according to claim 1, wherein one end of the communication passage is opened on the inner surface of the recess that closes the opening on the face side of the sensor mounting hole when the rotation angle at the time of replacement of the sensor holder is reached. Exchange-type earth pressure measuring device.   The exchange type earth pressure measuring device for a shield machine according to claim 1 or 2, wherein a pipe or a hose is connected to an opening inside the mine of the communication passage, and an open / close valve is provided in the pipe or hose.   The exchange type earth pressure measuring device for a shield machine according to claim 3, wherein a connecting member having a nipple for injecting grease is connected to the on-off valve.

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