JP3775701B2 - Device for detecting the pressing amount of the hermetic packing in a shield machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a tightness detection device for an airtight packing in a shield machine, particularly when a tunnel is constructed in a buried site such as drain material used for improving soft ground, The present invention relates to a tightness detection device for an airtight packing in a shield machine used when replacing a blade cutter for cutting a drain material or the like.
[0002]
[Prior art]
In recent years, a synthetic fiber bundle called a drain material that sucks up moisture contained in the ground has been used to improve the soft ground. When constructing a tunnel in a place where drain material is buried, drain material, etc. will appear on the face of the shield machine and become entangled with the cutter bit of the shield machine, thus obstructing propulsion. Need to cut. Therefore, a shield machine having a device for cutting the drain material has been proposed.
[0003]
FIG. 9 is a side sectional view of a shield machine provided with a cutting device for drain material or the like disclosed in Japanese Patent Laid-Open No. 7-4180.
In the figure, a is a shield machine. A cutter head c to which a cutter bit b is attached is provided at the front end of the shield machine a. The cutter head c is fixed to a rotary shaft d inserted through a partition wall g provided on the front surface of the shield machine a, and can be rotated by a drive motor e via a pinion gear s and a large gear r. . Then, the cutter head c is rotated to excavate the face surface f by the cutter bit b attached to the cutter head c, and the excavated gap is discharged to the outside by the screw conveyor t.
[0004]
The cutter head c is provided with a recess c1 that is open in the front-rear direction. One end of a blade mounting body h is pivotally attached to the inside of the recess c1 by a pin i, and a cutting blade j is pivotally supported on the other end of the blade mounting body h so as to be rotatable. The cutting blade j is rotationally driven by a hydraulic motor disposed inside the blade mounting body h. The blade mounting body h can be tilted 90 ° rearward by a tilting cylinder k pivotally supported on the back surface of the cutter head c.
[0005]
When the blade mounting body h is tilted 90 ° rearward, an opening n is provided in the partition wall g at a position facing the blade mounting body h, and a cutting blade replacement chamber m is provided in the opening n by the propulsion jack u. It is inserted slidably back and forth. Further, a split gate o is provided on the front surface of the cutting blade exchange chamber m, and the joint surface of the gate o can be pressure-tightly sealed. Note that q is a partition plate for closing the cutting blade replacement chamber m when the cutting blade j is replaced, and p is a gate o opening / closing cylinder.
[0006]
When digging with the shield machine a having the above-described configuration, the blade mounting body h is erected to excavate the face surface f, and at the same time, the cutting face f while rotating the cutting blade j pivotally attached to the blade mounting body h. Is cut along the rotation trajectory of the cutting blade j. A drain material or the like entangled with the cutter bit b is cut with a cutting blade j.
[0007]
When exchanging the cutting blade j, the blade mounting body h is rotated 90 ° backward by the raising cylinder k while rotating the cutter head c so that the center of the cutting blade j and the center of the opening n are aligned. Stop at the matching position. Then, the gate o of the cutting blade replacement chamber m is opened by the gate opening / closing cylinder p, the cutting blade replacement chamber m is advanced by the propulsion cylinder u, the gate o is closed, and the peripheral surface of the blade mounting body h is watertight. Press contact. Thereafter, the partition plate q in the cutting blade replacement chamber m is removed, and an operator enters the cutting blade replacement chamber m to replace the cutting blade j.
[0008]
When the replacement of the cutting blade j is completed, the partition plate q is attached, the gate o is opened, the cutting blade replacement chamber m is retracted, the gate o is closed, the blade mounting body h is erected, and the aforementioned drain material Resume cutting work.
[0009]
[Problems to be solved by the invention]
However, in the above conventional shield machine, when replacing the cutting blade j, the blade mounting body h is rotated 90 ° backward so that the recess c1 provided in the cutter head c is opened in the front-rear direction. Therefore, earth and sand will enter between the cutter head c and the partition wall g. In order to prevent intrusion of earth and sand, when the cutting blade j is taken into the cutting blade replacement chamber m, the gate o is closed so that the peripheral surface of the blade mounting body h is pressed in a watertight manner. About trust is not enough.
[0010]
The present invention has been devised in view of such problems of the prior art, and when exchanging the cutting blade, it is attached to the front end face of the maintenance hole in order to ensure the water tightness of the cutting blade replacement chamber (maintenance hole). It is an object of the present invention to provide a tightness detecting device for tightness packing in a shield machine that detects tightness of tightness packing.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a blade cutter case for accommodating a blade cutter that is provided near the outer periphery of the front surface of a cutter head of a shield machine and rotates to cut a drain material or the like embedded in a natural ground. With the airtight packing on the front end surface against the rear end surface, press the maintenance hole that can be moved forward and backward, open the hatch cover in front of the maintenance hole, and pull the blade cutter into the maintenance hole, the allowance for the airtight packing This is a device for detecting the tightness of an airtight packing in a shield machine to detect, and pushes the tip of a rod that can be advanced into a through hole provided in the hatch cover against the rear end surface of a blade cutter case to advance the maintenance hole. The amount of tightness of the airtight packing is detected by detecting the amount of the rod pushed back. Providing interference detecting device of the airtight packing in the shield machine and detecting.
[0012]
According to a preferred embodiment of the present invention, a ball valve through which the rod can penetrate is provided inside the through hole of the opening / closing lid of the maintenance chamber.
[0013]
According to a preferred embodiment of the present invention, the detection device is attached to the rod, a spring that biases the rod in a protruding direction, a cylindrical body that houses the rod and the spring, and a rear end of the cylindrical body. And a potentiometer for detecting the push-back amount of the rod.
[0014]
According to the present invention, the tightening allowance of the airtight packing attached to the front end surface of the maintenance hole can be reliably detected by the tightening allowance detecting device, so that the watertightness of the maintenance hole can be sufficiently ensured. Increased safety.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of the shield machine, and FIG. 2 is a front view.
1 and 2, reference numeral 1 denotes a shield machine. Reference numeral 2 denotes a cutter head provided in front of the shield machine 1, and a number of cutter bits 3 are attached to the front end portion thereof. The cutter head 2 can be rotated by a cutter head rotation driving device 24, and a tunnel is constructed by excavating the natural ground 4 while rotating. A blade cutter 6 that rotates and cuts an obstacle such as a drain material 23 embedded in the ground 4 is provided near the outer periphery of the front surface of the cutter head 2. In the present embodiment, two blade cutters 6 are provided one above the other on the paper surface. A body 6a supports the blade cutter 6, and a center shaft 6b is housed in a blade cutter case 7 provided to extend rearward of the cutter head 2. Reference numeral 7a denotes a rear end portion of the blade cutter case 7, and reference numeral 28 denotes a lid removably attached to the rear end portion 7a. Reference numeral 1 a denotes a plurality of shield jacks for propelling the shield machine, which are disposed on the rear inner peripheral surface of the shield machine 1.
[0016]
The blade cutter 6 is supported by a body 6a attached to the front end of the center shaft 6b. During the excavation work, the shield machine 1 stands up outward in the radial direction, rotates with the cutter head 2 while rotating, and cuts an obstacle such as the drain material 23 embedded in the ground 4. To do. On the other hand, when exchanging, the front end of the blade cutter replacement jack 22 is engaged with the rear end of the center shaft 6b, the body 6a is rotated, the blade cutter 6 is tilted sideways by 90 °, and the blade cutter 6 is in the blade cutter case. The center shaft 6b is pulled out rearward so as to be able to pass through the inside 7 and taken out into a maintenance hole 9 to be described later and placed on the table lifter 25.
[0017]
The maintenance hole 9 is accommodated in a maintenance hole case 9a provided at the rear of the blade cutter case 7 so as to be fixed to the partition wall 27, and can be slid in the front-rear direction by the forward / backward moving device 21 (FIGS. 5 to 8). It has become. Further, an airtight packing 8 is attached to the front end of the maintenance hole 9, and when the blade cutter 6 is replaced, it is pressed against the rear end portion of the blade cutter case 7 to maintain watertightness. As shown in FIG. 4, the hatch cover 10 is pivotally supported by pins 20 and 20 a via a link 19 in the front of the maintenance hole 9. As shown in FIG. 3, reference numeral 16 denotes a ball valve attached to a through hole 11 provided in the hatch cover 10, which has a through hole concentric with the through hole 11 of the hatch cover 10 and is opened and closed by an opening / closing lever 17. It is possible. Then, an interference detection device 5 described later is attached to the ball valve 16. 5 to 8, reference numeral 22 denotes a blade cutter replacement jack, and reference numeral 25 denotes a blade cutter replacement table lifter having a plurality of rollers 25a disposed on the upper surface thereof, which can be moved up and down by a lifting device (not shown). .
[0018]
FIG. 3 is a side sectional view of the interference detection device 5. As shown in the figure, the fastening allowance detecting device 5 is inserted into the through hole 16a and the through hole 11 and has a ball valve 16 having a through hole 16a attached to the through hole 11 of the hatch cover 10. Rod 12, a spring 13 that biases the rod 12 in a protruding direction, a cylindrical body 14 that houses the rod 12 and the spring 13, and a push-back of the rod 12 that is attached to the rear end of the cylindrical body 14 The potentiometer 15 detects the amount. In addition, 15a is a rod of the potentiometer 15 which contacts the rear end of the rod 12 and transmits the pushback amount of the rod 12. As shown in FIGS. 5 to 8, when the tip of the rod 12 is pressed against the rear end surface 7a of the blade cutter case 7 and the maintenance hole 9 is advanced, the amount of the rod 12 pushed back is detected. ing. Reference numeral 17 denotes an opening / closing handle for opening / closing the ball valve 16. Reference numeral 18 denotes a spring stopper externally fitted to the rod 12, and the rod 12 is always urged to protrude forward by the spring 12 fitted to the outer periphery thereof.
[0019]
5 and 6 show a state in which the hatch cover 10 is closed, the tightening margin detection device 5 is attached to the hatch cover 10, the maintenance hole 9 is advanced, and the hermetic packing 8 is pressed against the rear end surface 7a of the blade cutter case 7. FIG. 5 is a side sectional view, and FIG. 6 is a view taken along the line AA in FIG. Reference numeral 26 denotes a knife gate (see the one-dot chain line in FIG. 2) which is provided on the front surface of the blade cutter case 7 and slides in the vertical direction. When replacing the blade cutter 6, when the blade cutter 6 is pulled out, the blade cutter case 7 is closed to prevent inflow of earth and sand into the blade cutter case 7 and the maintenance hole 9.
[0020]
FIGS. 7 and 8 show a state in which the maintenance hole 9 is advanced from the state shown in FIGS. 5 and 6 with the interference detecting device 5 attached, and the hermetic packing 8 is pressed against the rear end surface 7 a of the blade cutter case 7. ing.
[0021]
Next, the operation based on the above embodiment will be described.
When replacing the blade cutter 6, the cutter head 2 is rotated and stopped at a position where the blade cutter case 7 and the maintenance hole 9 coincide. Then, the interference detection device 5 is attached to the rear of the ball valve 16 attached to the hatch cover 10, the ball valve 16 is opened, and the rod 12 of the interference detection device 5 is opened as shown in FIGS. Is passed through the through hole 16a and the through hole 11, and the rod 12 is projected to the stroke end. Subsequently, the maintenance hole 9 is advanced by the maintenance hole forward / backward moving device 21, and the airtight packing 8 is brought into contact with the rear end portion 7 a of the blade cutter case 7. At this time, if the tip of the rod 12 coincides with the front end face of the airtight packing 8 in advance or protrudes from the front end face of the airtight packing 8, the amount of the rod 12 pushed back can be detected. The tightness of the airtight packing 8 after contact can be detected. That is, at the time of the temporary assembly of the shield machine 1, the relationship between the pushback amount and the tightening allowance may be measured to reproduce the state. After pressing the airtight packing 8 in this manner and maintaining watertightness, the interference detecting device 5 is removed from the hatch cover 10, the hatch cover 10 is opened, and the lid 28 at the rear end of the blade cutter case 7 is also removed. The blade cutter replacement jack 22 is moved forward to engage the rear end of the center shaft 6b, and after the blade cutter replacement jack 22 is rotated, the blade cutter replacement jack 22 is moved backward to bring the maintenance shaft together with the center shaft 6b. 9 is pulled out and an operator enters the maintenance hole 9 to replace the blade cutter 6.
[0022]
When the replacement of the blade cutter 6 is completed, the blade cutter replacement jack 22 is again advanced to pass the center shaft 6b through the blade cutter case 7, and is positioned in front of the cutter head 2, and the blade cutter 6 is raised 90 °. Thereafter, the blade cutter replacement jack 22 is retracted, the lid 28 and the hatch cover 10 at the rear end of the blade cutter case 7 are closed, the maintenance hole 9 is retracted, and normal excavation work is performed.
[0023]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.
[0024]
【The invention's effect】
As described above, according to the present invention, when replacing the blade cutter, the maintenance hole is advanced and pressed against the blade cutter case, and the blade cutter case and the maintenance hole are made watertight, and then the blade cutter is maintained. The maintenance hole is pulled out into the hole and replaced in the maintenance hole.At this time, the maintenance hole is pushed forward while detecting the tightness of the airtight packing attached to the front end surface of the maintenance hole. There are excellent effects such as being able to reliably keep watertight.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a shield machine showing one embodiment of the present invention.
FIG. 2 is a front view of a shield machine showing an embodiment of the present invention.
FIG. 3 is a side sectional view of an interference detection device showing an embodiment of the present invention.
FIG. 4 is a top view of a hatch cover showing an embodiment of the present invention.
FIG. 5 is a side sectional view showing a state in which the hatch cover of the maintenance hole is closed and the tightening margin detection device is attached to the hatch cover.
6 is an AA arrow view of FIG. 5;
FIG. 7 is a side sectional view showing a state in which a tightness detection device is attached to the opening / closing lid, the maintenance hole is advanced, and the airtight packing at the front end of the maintenance chamber is pressed against the rear end portion of the blade cutter case.
FIG. 8 is a view taken along arrow BB in FIG.
FIG. 9 is a side sectional view of a shield machine showing an example of conventional technology.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 1a Shield jack 2 Cutter head 3 Bit 4 Ground 5 Tightening detection device 6 Blade cutter 6a Body 6b Center shaft 7 Blade cutter case 7a Blade cutter case rear end 8 Airtight packing 9 Maintenance hole 9a Maintenance hole case DESCRIPTION OF SYMBOLS 10 Hatch cover 11 Through-hole 12 Rod 13 Spring 14 Tubular body 15 Potentiometer 15a Potentiometer rod 16 Ball valve 16a Through-hole 17 Ball valve opening / closing handle 18 Spring stopper 19 Link 20, 20a Pin 21 Maintenance hole forward / reverse device 22 Blade cutter replacement Jack 23 Drain material 24 Cutter head rotary drive device 25 Table lifter 25a Roller 26 Knife gate 27 Bulkhead 28 Lid a Shield machine b Cutter bit c Head c1 Concave part d Rotating shaft e Drive motor f Face face g Bulkhead h Blade mounting body i Pin j Cutting blade k Cutting cylinder m Cutting blade replacement chamber n Opening o Gate o1 Watertight pressure contact part p Gate opening / closing cylinder q Partition plate r Large gear s Pinion gear t Screw conveyor u Cutting blade replacement room propulsion jack

Claims (3)

An air-tight packing is provided on the front end surface of the blade cutter case that houses the blade cutter that rotates around the front surface of the cutter head of the shield machine and rotates to cut the drain material embedded in the ground. When a maintenance hole that can be moved forward and backward is pressed, the hatch cover in front of the maintenance hole is opened, and the blade cutter is pulled into the maintenance hole, the allowance for the tight seal of the shield machine that detects the tightness of the tight seal packing is detected. A detecting device, wherein when the tip of a rod that can enter and exit into a through hole provided in the hatch cover is pressed against the rear end surface of a blade cutter case and the maintenance hole is advanced, the amount of the rod pushed back is measured. Shielding excavation characterized by detecting tightness of airtight packing by detecting Interference detection device of the air-tight packing in the machine. The tightness detection device for an airtight packing in a shield machine according to claim 1, wherein a ball valve through which the rod can penetrate is provided inside a through hole of a hatch cover of the maintenance hole. The detection device includes a rod that urges the rod in a protruding direction, a cylindrical body that accommodates the rod and the spring, and a potentiometer that is attached to the rear end of the cylindrical body and detects a pushback amount of the rod. An apparatus for detecting a tightness of an airtight packing in a shield machine according to claim 1.

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