JPH0755453Y2 - Water head differential pressure level measuring device hose expansion device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention is a head differential pressure level measuring device for measuring the excavation level of a shield machine or a tunnel machine, in which a hose is provided between the liquid tank on the reference side and the liquid tank on the measurement side. The present invention relates to a hose expanding / contracting device for extending a shield excavator or the like as it progresses, contracting after advancing a required distance, and then expanding again with the next progress.

[Prior art]

The applicant of the present invention has disclosed, as a level measuring device of this type, Japanese Patent Laid-Open No.
The one described in Japanese Patent Publication No. 105796 has already been provided. This device directly connects the measuring-side liquid tank mounted on the machine and the reference-side liquid tank fixed at the reference position with rubber hoses so that their liquid levels are always at the same level. The bottom pressure or the liquid level (head) is separately detected as an electric quantity, and the excavation level is obtained by electrically calculating the difference. The rubber hose is connected to the reel as the excavator advances. I simply pulled it straight out.

[Problems to be solved by the device]

Therefore, when the rubber hose is pulled out from the reel,
Due to the acceleration of the liquid in the rubber hose due to the rotation of the reel and the withdrawal of the rubber hose while swinging up and down greatly, the liquid violently flows in the rubber hose and spills over to both liquid tanks, causing the liquid surface to dig during and afterwards. It will fluctuate for a while. As a result, there are drawbacks such as a large measurement error and the fact that level measurement cannot be actually performed during excavation.To avoid this, wait until the liquid level in the liquid tank stabilizes before performing the measurement. There was a problem such as becoming longer. Therefore, between the reference side liquid tank and the measurement side liquid tank, a telescopic tube that is used in the mud shield construction method, earth and sand pressure feeding method, etc., for example, a telescopic tube that expands and contracts with a telescope structure as shown in FIG. It is conceivable to dispose a telescopic tube having a bending and folding structure as shown in FIG. In the case of FIG. 7, a small-diameter pipe 50 is slidably inserted into a large pipe 51, and a seal is provided between the two pipes 50 and 51 with a packing, and both ends are pulled by a winch or the like to contract. . In the case of FIG. 8, both ends are sequentially rotatably connected by joints 53 so that a plurality of pipes 52 can be bent vertically.
The joint 53 expands by increasing the bending angle and contracts by decreasing the bending angle. Similarly, the contraction is performed by pulling both ends with a winch or the like. However, in the case of the telescope structure, 2
Since it is composed of two tubes, the volume of the inner tube is the total volume in the contracted state, but the volume of the inner tube and the outer tube is the total volume in the expanded state, resulting in a volume change. . So this affects the head of the liquid tank,
I can't get correct readings. In the case of the bent and folded structure, since the pipe makes a vertical bending motion, the liquid in the pipe violently flows as the whole pipe expands and compresses, and this spreads to the liquid tank and causes a large measurement error. The present invention aims to solve various problems as described above.

[Means for Solving the Problems]

The present invention includes a liquid tank on the reference side and a liquid tank on the measuring side mounted on a shield machine or the like, and connects these liquid tanks via a hose or further via a differential pressure detector. The device is characterized in that a part of the required length of the hose in the previous term was meandered by a stretchable rage tongue and horizontally supported.

[Action]

For example, when the hose is pulled along with the excavation of the excavator, the rage tong extends, and only a part of the hose which is meanderingly and horizontally supported by the rage tongue extends while reducing the waviness of the meandering. Further, when the rage tongs are contracted, the hose contracts while increasing the meandering swell. The stretched and contracted portion expands and contracts without being vertically moved while being horizontally supported by the rage tongs, so that the liquid flows in the hose due to the expansion and contraction very little.

【Example】

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram of a digging level measuring device equipped with a hose expanding / contracting device according to the present invention. This measuring device includes, for example, a measurement side unit 2 mounted on a shield machine 1;
A reference side unit 3 placed at a determined reference position,
A hose support unit 5 that supports a hose 4 that connects these units 2 and 3, and a level display unit 6 that processes an electric signal from the reference side unit 3 and displays a digging level.
Composed of and. As the hose 4, it is preferable to use a tube for pneumatic driving equipment piping, which is made of nylon or polyurethane and has a small deformation and a small internal resistance. The measurement-side unit 2 has a liquid tank 8 attached to a frame or a case 7, and a hose connecting pipe 9 is connected to the bottom of the liquid tank 8. The hose connection pipe 9 is provided with a hose joint 10 and a manual valve 11 for drain treatment. The inside of the liquid tank 8 is opened to the atmosphere by an atmosphere open pipe 12. The reference side unit 3 has a frame or case 13 to which a liquid tank 14 and a differential pressure detector 15 are attached, and the following piping is provided. Inside the differential pressure detector 15, a first and second pressure receiving chambers 1 are provided by a diaphragm 16 which is a differential pressure movable body.
Liquid-divided into 7,18. Each of the pressure receiving chambers 17 and 18 is connected to the liquid tank 14 via a connecting pipe 20 having a manual valve 19.
And a hose connection pipe 23 via a connection pipe 22 having a manual valve 21. As described above, the first and second pressure receiving chambers 17 and 18 are both connected to the liquid tank 14 and the hose connecting pipe 23, but in use, one of the two manual valves 19 is opened and the other is closed. Similarly, by opening one of the two manual valves 21 and closing the other, the one pressure receiving chamber is made to communicate with the liquid tank 14, and the other pressure receiving chamber is made to communicate with the hose connecting pipe 23. A hose joint 24 is provided at one end of the hose connecting pipe 23, and a water injection port 25 is provided at the other end. Also, the hose connection pipe
A manual valve 26 for water injection is installed in the middle of 23, and for the first use, open this manual valve 26 and
A predetermined amount of water (or another liquid) is poured into the reference side liquid tank 14 and the measurement side liquid tank 8 from 25. Liquid tank 14
The inside is opened to the atmosphere by an atmosphere opening pipe 27. As shown in FIGS. 2 and 3, the hose supporting unit 5 includes a hose reel 28 for winding the hose 4 and a hose expanding / contracting device 29 for supporting the hose 4 pulled out from the hose reel 28. It is mounted on the sliding table 30 in the shape of a circle. The hose reel 28 is rotatably mounted between a pair of bearings 31 provided on the slide base 30. The hose reel 28 may be supported in a cantilever manner. As shown in FIG. 2, the hose expanding / contracting device 29 is constructed by horizontally mounting a rage tongue 33 on a horizontal frame 34, in which a large number of links 32 are sequentially intersected and the intersections and both ends are pin-connected. . The base end of the lathe tongue 33 is fixed to the horizontal frame 34, and the pins at the link intersections other than the base end are slidably fitted in the guide grooves 35 provided on the horizontal frame 34. It stretches back and forth while always maintaining a horizontal position. Hose 4 pulled out from hose reel 28
Is bent in a direction orthogonal to the expansion / contraction direction of the rage tongs 33 and is repeatedly meandered horizontally, and is lightly supported at each link intersection of the rage tongs 33. Therefore, the hose 4 has a meandering shape when the ledge tongue 33 extends and the center-to-center distance of the link 33 increases at the length 4a from the base end to the tip of the rage tongue 33 as shown in FIGS. 4 to 5. When the rage tongue 33 contracts, it expands while reducing the undulations, and when the rage tongue 33 contracts, it contracts while increasing the meandering swell. A portion 4b of the hose 4 ahead of the hose expansion / contraction device 29 is connected to the hose joint 10 on the measurement side unit 2 side via the trailing carriage 36 of the shield machine 1. On the other hand, the base end side of the hose 4 that is pulled out to the rear of the hose reel 28.
4c is supported halfway by a hanger 37 and has its base end connected to the hose joint 24 of the reference side unit 3. Now, assuming that the first pressure receiving chamber 17 is connected to the hose connecting pipe 23 and the second pressure receiving chamber 18 is connected to the liquid tank 14, the first pressure receiving chamber 15 of the differential pressure detector 15 of the reference side unit 3 is Pressure chamber
Although 17 is connected to the liquid tank 8 of the measurement side unit 7 via the hose 4, the second pressure receiving chamber 18 is blocked by the diaphragm 16. The liquid tank 14 of the reference side unit 3 is
As described above, it communicates with the second pressure receiving chamber 18,
Since the first pressure receiving chamber 17 is shut off by the manual valve 19, the water on the liquid tank 8 side of the measurement side unit 2 and the water on the liquid tank 14 side of the reference side unit 3 are shut off from each other by the diaphragm 16. The diaphragm 16 covers both liquid tanks 8,
It will bend according to the difference in the head pressure of 14. The differential pressure detector 15 has an electric quantity conversion unit 38 that converts the amount of bending of the diaphragm 16 into an electric quantity by a piezoelectric element or the like. Therefore, the differential pressure detector 15 is used in the liquid tank 8 of the measurement side unit 2.
Therefore, a current signal corresponding to the difference between the above-described head pressure and the head pressure of the liquid tank 14 of the reference side unit 3 (hereinafter, this difference is referred to as a head difference) is output. This current signal is transmitted to the remote level display panel 40 via the cable 39. The level display board 40 includes a distributor 41, a first-order delay calculator 42, a level display 43, a zero reset circuit 44, and a zero reset level display 45.
The current signal corresponding to the head pressure difference detected at 15 is converted into a DC voltage by the distributor 41, and then calculated by the first-order delay calculator 42. Then, the level from the reference position of the shield machine 1 is displayed on the level indicator 43.
Further, when a zero reset is performed by the zero reset circuit 44, the level at that time (zero reset level) is displayed on the zero reset level indicator 45. The data can be recorded by connecting an appropriate data logger to the data recording DC output terminal 46. The excavation level measuring device is configured as described above, and its operation and usage will be described below. On the reference side unit 3 side, it is selected to open or close the manual valves 19 and 21, and for example, the first pressure receiving chamber 17 of the differential pressure detector 15 is connected to the measurement side liquid tank 8 via the hose 4, while the second side is connected to the second side. The pressure receiving chamber 18 is communicated with the liquid tank 14 of the reference side unit 3. Also, the rage tongs 33 are contracted. When the shield machine 1 is advanced in this state, the hose 4 is pulled and the rage tongue 33 extends as shown in FIGS. 4 to 5, and accordingly, only the elastic portion 4a of the hose 4 is supported by the rage tongue 33. It extends as it is and is not pulled out from the hose reel 28. In this case, the stretchable part 4a of the hose 4
Supported by the rage tongs 33, the meandering swell is gradually reduced while maintaining the horizontal state, and the swelling is extended without vertical vibration. Therefore, the water flow in the hose 4 accompanying the extension is extremely small. Therefore, the pressure fluctuation caused by the expansion of the hose 4 is small, and the fluctuation does not reach the extent of bending the diaphragm 16, and the diaphragm 16 keeps the head pressure difference between the liquid tanks 8 and 14 even while the hose 4 is expanded. Accurately, the level of the shield machine 1 relative to the reference position is accurately displayed on the level display board 40 with little error. Measurement side liquid tank 8
Since the water in the liquid tank 14 and the water in the liquid tank 14 on the reference side are insulated from each other by the diaphragm 16 of the differential pressure detector 15, the diaphragm 16 has a difference between the water head pressure of the liquid tank 8 and the water head pressure of the liquid tank 14. When the excavation occurs, the shield excavator 1 flexes immediately in response to the difference, so that the level variation of the shield machine 1 is displayed on the level display board 40 momentarily with high responsiveness and with little error even during excavation. When the shield machine 1 digs one span, the stretchable portion 4a of the hose 4 extends by a predetermined length. Therefore, the hose 4 is pulled out from the hose reel 28 by the length of the extension (the reference side unit 3 is placed at the fixed position as described above), and the entire hose support unit 5 is required as shown in FIG. While moving forward by a distance, the rage tongue 33 is contracted by, for example, manual operation, and the retracted part of the hose 4 is newly supported by the contracted rage tongue 33,
Similarly, the shield machine 1 is excavated.

[Effect of device]

As described above, according to the hose expansion / contraction device of the present invention, a part of the hose expands / contracts without being vertically moved while being horizontally supported by the rage tongs, so that the liquid flow in the hose due to the expansion / contraction is very small, Therefore, the level measurement can be performed much more accurately than in the past.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an excavation level measuring apparatus equipped with a hose expanding / contracting device according to the present invention, FIG. 2 is a plan view of the hose expanding / contracting device of the present invention, FIG. 3 is a side view thereof, and FIGS. The figure is a diagram for explaining the expansion and contraction operation. FIG. 7 shows a telescopic tube having a conventional telescope structure, and FIG. 8 shows a telescopic tube having a conventional bending and folding structure. In each drawing, (a) shows a contracted state and (b) shows an extended state. 1 ... Shield machine, 4 ... Hose, 29 ... Hose expansion / contraction device, 8 ... Measuring side liquid tank, 14 ... Reference side liquid tank, 33 ... Rage tongs.

Claims (1)

[Scope of utility model registration request] 1. A head differential pressure type level comprising a reference side liquid tank and a measuring side liquid tank mounted on a shield machine or the like, and connecting these liquid tanks via a hose or further via a differential pressure detector. In the measuring device, a part of the required length of the hose is supported by a stretchable rage tongue in a meandering manner so as to be horizontally supported.