JPH067232Y2 - Valve device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a valve device used for a muddy water supply / drainage circuit in a shield tunnel excavator, and in particular, a water supply channel and a drainage path are mutually connected by a bypass pipe to connect both water channels. The present invention relates to a valve device that can be short-circuited.

(Prior Art) As one of shield-type tunnel excavators, pressurized water is supplied to a region in front of a partition wall through a supply pipe to prevent collapse of a face and spout of groundwater from the face by the pressure of the pressurized water. There is a muddy water pressure type shield tunnel excavator that discharges the pressurized water supplied to the front area along with the excavated shear through the discharge pipe to the area behind the bulkhead.

In this type of excavator, at the start of use, first close the supply pipe and the discharge pipe, and open the bypass pipe provided behind the excavator from the closed position of the supply pipe and the discharge pipe to open the supply pipe and the discharge pipe. Is short-circuited, and in this state, pressurized water is circulated through the bypass pipe, and the pressure of the pressurized water is adjusted to the same pressure as the groundwater pressure during that time.After that, the bypass pipe is shut off and the supply pipe and discharge pipe are opened. The pressurized water is guided to the front area, and the pressurized water is guided to the rear area together with the slip.

The conventional valve device used in this type of shield tunnel excavator is a triple valve device in which a water shutoff valve that only opens and closes the flow path is provided in each of the supply pipe, the discharge pipe, and the bypass pipe. is there.

As described above, in the conventional valve device using three general valves, the water shutoff valve must be arranged in the bypass pipe, and the three valve bodies must be simultaneously rotated. A first stem whose both ends are engaged with the stem connecting portion of the first valve body, a bell crank non-rotatably engaged with the first stem, and a side of the bell crank on a fluid pressure cylinder side. It requires a link mechanism connected to the opposite end and converting the motion of that end into a rotary motion, and a second stem which rotates with the rotary motion of the output shaft of the link mechanism.

Therefore, in such a conventional valve device, the structure of the stem and the driving means for rotating the three valve bodies simultaneously becomes complicated, and the stem and the driving means become large, so that the valve device becomes complicated and large. As a result, when the conventional valve device is used for a small-diameter shield tunnel excavator, particularly for an excavator by the pipe propulsion method in which the shield body is advanced together with the segment rings sequentially arranged behind it, the valve device in the shield body is Occupies a large space, and the work of confirming the forward direction of the shield body becomes complicated.

(Object of the Invention) An object of the present invention is to provide a stem and a drive for activating valve bodies of both switching valves for a supply pipe and a discharge pipe without providing a valve body of a third switching valve in a bypass pipe as in the conventional case. It is an object of the present invention to provide a valve device which has a simple structure and a small size, a simple structure, and a small size.

(Structure of the Invention) A valve device of the present invention includes a casing having a valve seat defining first, second and third openings, and a valve element in the casing for selectively communicating the openings with each other. A pair of switching valves respectively provided, a bypass pipe communicating the third openings of the switching valves with each other, a stem connected to the valve bodies to rotate the valve bodies simultaneously, and the first valve Drive means for rotating both valve bodies through the stem to selectively communicate the second opening and the first opening and the third opening with each other,
The first and second openings of each of the switching valves are formed at positions facing each other, and the third opening of each of the switching valves is on a side orthogonal to an axis connecting the first and second openings. And the valve element of each of the switching valves is provided with first and second flow paths communicating with each other, and from the first and second flow paths in a direction orthogonal to the flow path. Third growing
And the valve element of each switching valve is rotatably arranged in the casing about an axis orthogonal to each of the axes of the first, second and third flow paths. It is characterized by

(Operation and effect of device) When the drive means is operated, both valve bodies are simultaneously rotated.
Thereby, each valve body connects the first opening and the second opening, or the first opening and the third opening. When the first opening and the second opening are in communication with each other, the third opening becomes the first opening.
And since it cuts off from the 2nd opening, both switching valves are not short-circuited. On the other hand, when the first opening and the third opening are communicated with each other, the second opening is blocked from the first and third openings, and the two switching valves are communicated with each other via the bypass pipe. Therefore, the flow passage of the bypass pipe can be opened and closed by operating the valve bodies of the two switching valves.

According to the present invention, since it is not necessary to provide the bypass pipe with a switching valve that is driven at the same time as both the switching valves for the supply pipe and the discharging pipe and that is separate from the aforementioned switching valves, both switching valves for the supply pipe and the discharging pipe are provided. The structure of the stem and the drive means for rotating the valve body of the valve is simplified, the stem and the drive means are miniaturized, and as a result, the structure of the valve device is simplified and the valve device is miniaturized.

(Embodiment) A valve device 10 shown in FIGS. 1 to 4 includes a pair of switching valves 1.
Including 2,14. The two switching valves 12 and 14 have the same shape and shape, and are provided with a casing 16 as will be described below as a representative of the one switching valve 14.

The casing 16 includes a boring portion 18, first and second holes facing each other through the boring portion, and the boring portion 18.
To a third hole that is open to a side orthogonal to the axes of the first and second holes, and a hole that is opened from the boring portion 18 to a side that is orthogonal to the axes of the first, second, and third holes. 4 holes.

A pipe 20 defining a flow path communicating with the first hole is fixed to both casings 16. Both casings 1
6 is arranged such that the first and second holes extend horizontally, the third hole extends vertically, the fourth hole is aligned with each other, and the pipe 20 is parallel. ing.

The boring 18 of the casing 16 is provided with a shoulder extending around the first hole along the first hole, the valve seat defining an opening 22 for fluid. 24 are arranged. The valve seat 24 has a concave spherical surface, and a substantially spherical valve body 26 having a convex spherical surface matching the concave spherical surface is in contact with the concave spherical surface.

A valve seat 30 defining an opening 28 for fluid is arranged on the side of the casing 16 opposite the valve seat 24. Valve seat 3
0 has the same shape as the valve seat 24, and the casing 1
6 is in contact with the shoulder portion of the pressing member 32 screwed into the second hole 6 and is further pressed by the pressing member 32 against the concave spherical surface of the valve seat 24. The pressing member 32 has a flow path 34 communicating with the opening 28.

The third hole in the casing 16 has an opening 36 for fluid.
The valve seat 38 that defines Each switching valve 12,
The openings 36 of 14 are communicated with each other by a bypass pipe 40 fixed to the casing 16 with bolts.

A bearing 42 is fitted in the fourth hole of the casing 16, and a stem 44 for rotating the valve body 26 is rotatably and liquid-tightly supported in the bearing. Both ends of the stem 44 are square poles, and are non-rotatably fitted in recesses provided in the valve body 26.

As shown in FIG. 5, the valve body 26 includes three flow paths 46, 48, 50 which are in communication with each other. Channels 46, 48
Form one through hole that allows the second openings 22 and 28 to communicate with each other. On the other hand, the flow path 50
Extends from the through hole in a direction orthogonal to its axis. Further, the valve body 26 is arranged such that an axis line 52 orthogonal to each of the axis lines of the flow paths 46, 48, 50 coincides with the axis line of the fourth opening and is rotatably arranged around the axis line 52. Has been done.

As the valve element 26, a rod-shaped element may be used in addition to the ball-shaped element as in the above embodiment.

The valve device 10 also includes a hydraulic cylinder 54 that operates the valve body 26 via the stem 44. Fluid pressure cylinder 54
The cylinder tube 56 is rotatably connected to a fitting 58 fixed to the pipe 20, and the piston rod 60 is connected to a pulley 62 fixedly arranged at the longitudinal center of the stem 44. The pulley 62 has a protruding portion 74 protruding from one end portion in the radial direction thereof, and is connected to the piston rod 60 at the protruding portion 74 via a pivot connector 76.

The end of the wire 64 is wound around the pulley 62 and the end of the wire is fixed. Wire 6
4 is connected to a display 68 via a protective tube 66 fixed to the casing. The display 68 is the switching valve 1
Whether or not the first and second openings 22.28 of 2, 14 are in communication with each other and the opening thereof are displayed. The indicator 68 includes a scale plate 70 fixed to a support base 78 of a device in which the valve device 10 is arranged, for example, a shield tunnel excavator, and the scale plate 70 movably supported on the scale plate along the scale of the scale plate. And the pointer 72 connected to the other end of the wire 64
With. One end of the tube 66 is fixed to one casing 16 by a fitting 80, and the other end is fixed to a support base 78 by a fitting 82.

In this valve device 10, as shown in FIGS. 1 to 3, when the piston rod 60 is retracted into the cylinder tube 56, the flow passage 46 of the valve body 26 is aligned with the opening 22 and the flow is reduced. Channel 48 is aligned with opening 28 and channel 50
Are arranged so as to open downward. In this state, the openings 22 and 28 are in communication with each other via the flow paths 46 and 48 of the valve body 26, but the opening 36 is closed by the valve body 26. Therefore, the pipes 20 of the sluice valves 12 and 14 and the pressing member 32 are in communication with each other, whereas the sluice valves 12 and 14 are not in communication with each other. The pointer 72 of the display 68 is moved to a position indicating that the openings 22 and 28 of the switching valves 12 and 14 are completely communicated with each other.

When the piston rod 60 is projected from the cylinder tube 56, the valve body 26 is rotated by 90 degrees counterclockwise in FIG. 2 around the axis 52 from the position by the fluid pressure cylinder 54. , Channel 46 opens downwards, channel 48 aligns with opening 36, and channel 5
0 is aligned with opening 28. In this state, the openings 28 and 36 are communicated with each other via the flow paths 48 and 50 of the valve body 26, and the opening 22 is closed by the valve body 26. Therefore, the switching valves 12 and 14 are connected to the bypass pipe 40.
Are communicated with each other. Since the wire 64 is wound around the pulley 62, the pointer 72 of the display device 68 has the switching valve 1
2 and 14 have been moved to a position indicating that they are communicated with each other via the bypass pipe 40.

When the valve body 26 is rotated 90 degrees in the opposite direction by the hydraulic cylinder 54, the valve body 26 again aligns the flow path 46 with the opening 22, the flow path 48 with the opening 28, and The flow path 50 is arranged so as to open downward. At this time, since the wire 64 is rewound from the pulley 62, the pointer 72 of the indicator 68 is opened by the openings 22, 28 of the switching valves 12, 14.
Have been moved to a position that indicates they are in full communication.

The valve device 10 described above can be used in equipment in which two pipes are arranged and the pipes need to be short-circuited. For example,
When applied to the shield body of the shield type tunnel excavator, it is assembled in the shield body 100 as shown in FIG.

The shield body 100 is provided with a cutter head 101 for excavating a face. The cutter head 101 is a spoke type or a slit type. The shield body 100 includes a hydraulic jack 1 installed in a vertical hole 102.
It is propelled laterally from the vertical hole 102 by 03. After the majority of the shield body 100 is propelled, a shield pipe 104 is applied to the rear side of the shield body 100, and the shield body 100 is propelled by the hydraulic jack 103 via the shield pipe 104, which causes the shield pipe to reach the ground. It will be buried sequentially.

A pressure gauge 105 for measuring the groundwater pressure of the face is attached to the front end of the shield body 100, while the pump 1
Pressurized water supply pipe 107 for supplying pressurized water from 06 to the face
A pressure gauge 108 for measuring the supply water pressure is incorporated in the.

Gate valves 12 and 14 of the valve device 10 are arranged in the pressurized water supply pipe 107 and the shear discharge pipe 109, respectively. The pressurized water supply pipe 107 includes the pipe 20 of the sluice valve 12 and the pressing member 32.
The shear discharge pipe 109 is connected to the pipe 20 of the sluice valve 14 and the pressing member 32. The fluid pressure cylinder 54 of the valve device 10 is connected to a hydraulic unit 110 installed in the shield body 100, and the hydraulic unit 110 can be operated by an operation panel 111 outside the shield pipe 104.

The compressed water supply pipe 107 and the shear discharge pipe 109 are the expansion pipe 1
12 and 113 are connected to the main pipes 114 and 115, respectively. Main pipe 11 to which pressurizing pump 106 is connected
4, a butterfly type pressure adjusting valve 116 and a water shutoff valve 1
And 17 are provided. A water shutoff valve 119 is provided in the main pipe 115 to which the suction pump 118 is connected. A bypass pipe 121 including a bypass valve 120 is connected between the source pipe 114 and the source pipe 115 and closer to the shield body 100 than the pressure adjusting valve 116.

The pressure adjusting valve 116 and the pressurized water supply pipe 107 are for adjusting the water supply pressure in advance. As the distance between this position and the pressure gauge 108 increases, the above-mentioned pressure fluctuation increases. In the illustrated example, the switching valves 12, 14
Are connected to each other by a bypass pipe 40, and the double switching valve 1
2, 14 and the bypass pipe 40 are provided with the functions of the bypass pipe 121 and the bypass valve 120 in addition to the control of the pressurized water supply and the shear discharge. However, in order to exercise caution in operating the shield propulsion device, the bypass pipe 12
1 and the bypass valve 120 are preferably provided as they are.

The pressure regulating valve 116 is opened to the middle, and the water shutoff valve 117 and the water shutoff valve 1
19 is opened, the bypass valve 120 is closed (the operation of these valves is performed manually or automatically), and the fluid pressure cylinder 54 is operated to connect the pressurized water supply pipe 107 and the shear discharge pipe 109 by the switching valves 12 and 14. Closed, switching valves 12, 14
Are short-circuited by the bypass pipe 40. In this state, the pressure pump 106 and the suction pump 118 are operated,
Both pumps are balanced and pressure gauge 105 and pressure gauge 108
Compare the pressure with.

When the pressures of both pressure gauges are not equal and the groundwater pressure is higher than the pressurized water pressure, the degree of opening of the pressure regulating valve 116 is increased. Conversely, when the groundwater pressure is lower than the pressurized water pressure, the pressure regulating valve is increased. By adjusting the opening of 116, both pressures are adjusted to be equal. When pressure oil is supplied to the fluid pressure cylinder 54 when the two pressures become equal, the valve bodies 26 of the two switching valves 12 and 14 are rotated 90 degrees, so that the pressurized water supply pipe 107 and the shear discharge pipe 109 are supplied.
Is opened and the bypass pipe 40 is closed at the same time. As a result, the pressurized water reaches the face from the pressurized water supply pipe 107,
After that, it is circulated to the settling tank 122 through the shear discharge pipe 109, so that the ground is kept stable.

In this case, since the switching valve 12 of the pressurized water supply pipe 107 and the switching valve 14 of the shear discharge pipe 109 are simultaneously operated, the above-mentioned inconvenience caused by the aging operation does not occur. Moreover, the number of the fluid pressure cylinders that are the actuators of the valve device may be one, and the stem 4 that rotates the valve body 26 of the switching valves 12 and 14
Since 4 is common, the space between the pressurized water supply pipe and the shear discharge pipe can be made sufficiently small, and as a result, the shield body and the shield pipe can be made smaller in diameter. For example, in a shield propulsion device in which the inner diameters of the pressurized water supply pipe and the shear discharge pipe are 50 mm, the centerline distance between the two pipes may be 230 mm, and the outer diameter of the shield pipe may be about 490 mm.

According to the valve device 10, since it is not necessary to provide the bypass pipe with a switching valve that is separate from the conventional switching valve that is driven at the same time as the switching valves for both the supply pipe and the discharge pipe, which is required in the conventional valve device, The structure of the stem and the driving means for rotating the valve body simultaneously becomes simple, and the stem and the driving means become small,
As a result, the structure of the valve device is simplified and the valve device is downsized. Therefore, even if the valve device 10 is used for a shield tunnel excavator having a small diameter, particularly for an excavator by a pipe propulsion method in which a shield body is advanced together with segment rings sequentially arranged behind the shield tunnel excavator, The occupied space is small, and the work of confirming the forward direction of the shield body will not be complicated.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of a valve device according to the present invention in section, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a cross-sectional view taken along line 3, FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1, FIG. 5 is a cross-sectional view showing an embodiment of the valve body, and FIG. 6 is a valve body. 2 is a sectional view similar to that of FIG. 2 when it is rotated, FIG. 7 is a sectional view taken along the line 7-7 of FIG. 6, and FIG. 8 is a valve device of the present invention for a shield propulsion device. FIG. 10: Valve device, 12, 14: Switching valve, 16: Casing, 22, 28, 36: Opening, 24, 30, 38: Valve seat, 26: Valve body, 40: Bypass pipe, 44: Stem, 46, 48 , 50: flow path, 52: axis line, 54: fluid pressure cylinder.

Claims (1)

[Scope of utility model registration request] 1. A valve device for use in a muddy water supply / drainage circuit of a shield tunnel excavator, comprising: a casing having a valve seat defining first, second and third openings, and the opening in the casing. A pair of switching valves each having a valve body that selectively communicates with each other, a bypass pipe that communicates the third openings of the two switching valves with each other, and both valve bodies for simultaneously rotating the two valve bodies. A stem connected to the first opening, the first opening, the second opening, and the first opening.
Drive means for rotating both valve bodies through the stem so as to selectively communicate the third opening and the third opening, and the first and second openings of each switching valve face each other. Is formed in a portion of the switching valve, and the third opening of each switching valve is formed in a portion on a side orthogonal to an axis connecting the first and second openings, and the valve element of each switching valve is formed. Has first and second flow paths communicating with each other, and a third flow path extending from the first and second flow paths in a direction orthogonal to the flow paths. The valve device is arranged in the casing so as to be rotatable around an axis orthogonal to each of the axes of the first, second and third flow paths.