JPS6147956B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direction correction device for a shield tunnel machine, in particular for the correction of the propulsion direction.
The present invention relates to a device for correcting the relative propulsion direction of both parts of a shield consisting of two parts, front and rear.

The shield body consists of two parts, namely the front and rear parts of the shield, a tail part, and a head part which is connected to the tail part so as to be able to swing up and down, left and right, and diagonally. A direction correction device for a shield tunnel machine that excavates inside conventionally includes a plurality of single-acting hydraulic jacks with one end pivoted to the head section and the other end pivoted to the tail section, and each hydraulic jack. It was equipped with a pump that supplied pressurized liquid and a switching valve that selectively switched the pressurized liquid from the pump to each hydraulic jack.

The direction correction operation of the direction correction device is performed using a hydraulic jack located on the opposite side of the shield body across the center of the shield body from a hydraulic jack located on the side in the direction in which the shield body is to be guided when direction correction is required. Pressure fluid is supplied to the jack, and the head is operated by pushing. However, in such a pushing operation, the part of the head located in the direction in which the shield body is being guided may encounter some resistance or
For example, since this part does not actively change direction unless subjected to excavation resistance from the soil, a problem has often arisen in that the direction correction is not reliably carried out at the desired position.

In view of the above, as shown in Japanese Patent Application No. 55-127945 (Japanese Unexamined Patent Publication No. 57-54698), one end is pivoted to the head portion of the shield body and the other end is pivoted to the tail portion of the shield body. 4, two of which are arranged on each of two inclined straight lines passing through the center of the head and intersecting each other so as to be arranged symmetrically with respect to a vertical line and a horizontal line passing through the center of the head. a double-acting hydraulic jack for direction correction; a pump for supplying pressure fluid to each hydraulic jack; A direction correction device for a pipe propulsion shield, comprising a switching valve for supplying and shutting off pressure fluid to the pipe, and operating two hydraulic jacks located on the inclined straight line in mutually opposite directions. was proposed.

According to the direction correction device, the drawbacks of the conventional push-button operation described above are eliminated. However, since it is necessary to install four hydraulic jacks within the shield body, there is a limit to reducing the diameter of the shield body and, therefore, the propulsion tube that follows the shield body.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a direction correction device for a shield tunnel machine, which eliminates the disadvantages of push-handed operation and allows the diameter of the propulsion tube to be made as small as possible. be.

Another object of the present invention is to provide a direction correction device for a shield tunnel machine, which facilitates direction correction operations by providing an indicator to indicate the extent to which the head portion of the shield body is deflected relative to the tail portion. Our goal is to provide the following.

The present invention provides a rod having a central axis intersecting a vertical line passing through the center of the head when the rod is in a neutral state with respect to the tail, one end of which is pivoted to the head and the other end is connected to the tail portion via a universal joint, and each rod is arranged symmetrically with respect to the vertical line, one end of each rod is pivotally supported on the head portion, and the other end of each rod is connected to the tail portion. two double-acting hydraulic jacks pivotally supported on the hydraulic jacks, a pump for supplying pressure fluid to both the hydraulic jacks, and a pump disposed between the pumps and each of the hydraulic jacks and from the pump to the It is characterized by including a switching valve for supplying and shutting off pressure fluid to each hydraulic jack.

In addition to the above, the present invention further provides an indicator comprising a scale plate fixed to the tail part and a pointer supported by a support member extending from the head part to the tail part and disposed opposite to the scale plate. It is characterized by containing.

According to a preferred embodiment of the invention, the center of the rod and the centers of the two hydraulic jacks are on the same circle;
They are located at intervals of 120° in the circumferential direction. Therefore, 2
The hydraulic jacks can have the same size and shape, which simplifies the operation.

If the invention includes an indicator, the indicator may be directly observed by the operator when the shield body is large in diameter and allows the operator to enter the shield body. Therefore, at this time, the switching valves for supplying and cutting off the pressure fluid to each hydraulic jack are operated within the shield body by the operator.

Even when the shield body is large in diameter and allows workers to enter the shield body, in the case of tube propulsion, the indicator may be observed from outside the shield body and the propulsion tube following this shield body. There is also. Similarly, in the case of tube propulsion, if the diameter of the shield body is small and the operator cannot enter the shield body, observation from the outside is essential. At this time,
For example, the indicator can be observed using a transit or leveler, and a TV camera is installed inside the shield body, while a monitor TV is installed outside, and the indicator imaged by the TV camera is observed on the monitor TV. You can also do that. From the viewpoint of accuracy, speed, and reliability of operation, it is preferable to use a television camera and a television monitor. When observing the indicator externally, use a switching valve that can be controlled remotely, such as an electromagnetic switching valve, and place the switching valve itself as close as possible to the hydraulic jack.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a tube propulsion shield tunnel machine will be described below with reference to the accompanying drawings.

The direction correction device of the present invention corrects the direction by swinging the head portion 12 of the shield, which serves as the shield main body 10 and includes a head portion 12 and a tail portion 14, in vertical, horizontal, and diagonal directions with respect to the tail portion 14. . A propulsion tube 16 follows the shield body 10, and the shield body 10 is propelled by receiving a pressing force from a main pusher (not shown) via the propulsion tube 16. Note that when the present invention is applied to a general shield tunnel machine, the shield body 10
Propulsive force is provided by a plurality of hydraulic jacks (not shown) disposed between the tail section 14 and the lining section.

A cutter head 20 is rotatably attached to a partition wall 18 at the tip of the head portion 12. This cutter head 20 rotates in response to rotational force transmitted from an electric motor 22 via a reduction gear 24, and excavates a cutting face. A mud-feeding pipe 26 and a mud-discharging pipe 28, which are opened on the face side of the partition wall 18, are fixed to the partition wall 18. Excavation of the face is performed while the mud water sent to the face through the mud feed pipe 26 is balanced with earth pressure and/or water pressure, and shear is discharged through the mud drain pipe 28. The construction described is known per se for shields for tube propulsion and general tunneling machines.

A shield member 29 is installed at the connection between the head portion 12 and the tail portion 14, and the head portion 12 can swing relative to the tail portion 14 in a liquid-tight state. For this rocking motion, one rod 30 and two hydraulic jacks 32, 34 are arranged.

The rod 30 serves to secure the head 12 as it swings relative to the tail 14. As shown in FIGS. 1 and 2, this rod 30 has a head portion 12 and a tail portion 14.
Its central axis intersects perpendicularly with a vertical line H passing through the center O of the head portion 12 when it is in a neutral state with no directional displacement relative to the head portion. This rod 30
is rotatably supported by a pin 36 on a bracket 13 provided on the head portion 12, and the tail portion 1
It is connected to a bracket 15 provided at 4 by a universal joint 38. The rod can also be connected to the bracket 13 via a universal joint. Universal joint 38
are respectively rotatable around two pins 36 that are perpendicular to each other.

The hydraulic jacks 32, 34 are double-acting hydraulic cylinders having the same size and shape. As shown in FIG. 2, the central axis of the rod 30 and the central axes of the two hydraulic jacks 32, 34 are parallel to each other and on the same circle C. Since the central axis is located at a distance of 120° from the central axis of the rod 30,
The same force may be applied to the head portion 12. Therefore, it is possible to use hydraulic jacks having the same size and shape. As this hydraulic jack, any known hydraulic jack can be used as is, as long as it is a double-acting type, that is, a hydraulic cylinder that operates the rod 33 both in the pushing direction and in the pulling direction. Since this hydraulic jack is subjected to torsional forces during direction correction, it is preferably connected to the head section 12 and the tail section 14, respectively, by a self-centering connection structure constructed as follows.

As shown in FIG. 3, for example, a hole 42 in a bracket 40 of a hydraulic jack has a shoulder 43, and an outer race 4 of a self-aligning bearing 44 fitted in the hole 42.
5 is locked to this shoulder 43, and the other end of the outer race 45 is positioned by a retaining ring 48.

The self-aligning bearing 44 consists of an outer race 45 and an inner race 46. The inner periphery of the outer race 45 is a convex spherical surface 49, and the outer periphery of the inner race 46 is a convex spherical surface 50 that matches the spherical surface 49. Instead of this, ordinary self-aligning bearings,
Of course, it is also possible to use commercially available self-aligning bearings which are known per se and have balls or rollers fitted between the outer race and the inner race.

The mounting seat 52 is fixed to the head portion 12, and two brackets 53 and 54 are spaced apart from each other and project toward the hydraulic jack 32. The bracket 40 of the hydraulic jack 32 is inserted between the brackets 53 and 54. Bracket 53,5
4 has a hole 55, and the pin 5 is inserted into this hole 55.
6 has been inserted. The pin 56 is fitted into the hole 51 of the inner race 46 of the self-aligning bearing 44. The pin 56 has a head 57 at one end which is engaged with one of the brackets 53, 54 and extends from the bottom 5 through a hole 55 in the other bracket.
A bearing retainer 58 having a number 9 is inserted. The bearing retainer 58 abuts the inner race 46 of the self-aligning bearing 44 at its tip to hold it in place and also holds the inner race 46 of the self-aligning bearing 44 in place.
Prevents it from coming off. A bolt 60 is inserted into a hole 61 provided in the bottom portion 59, and this bolt 60 is attached to the pin 56.
A shoulder 62 provided on the outer periphery of the bearing holder 58 is secured to the end of the hole 55 of the bracket 54 by screwing it into a screw hole provided in the bracket 54 .

The hydraulic jacks 32, 34 are connected to the pump 70 as shown in FIG. The piping 72 connected to the outlet of the pump 70 is divided into two branch pipes 74 and 76.
The branch pipes 74 and 76 are connected to electromagnetically operated switching valves 78 and 80, respectively. On the other hand, return pipes 75 and 77 are connected from each switching valve 78 and 80 to an oil tank 82. Two pipes 84, 85 and 86 are provided on the outlet side of each switching valve 78, 80, respectively.
87 is connected. Pipes 84 and 85 connected to one of the switching valves 78 are connected to liquid chambers 90 and 91 separated by a piston 88 in the hydraulic jack 32 via pilot check valves 92 and 94, respectively. , the pipes 86 and 87 connected to the other switching valve 80 are connected to the liquid chamber 9 of the hydraulic jack 34.
Pilot check valve 96 at 0 and 91, respectively.
It is connected via 98.

The pilot check valves 92, 94, 96,
98 is actuated by the pressure fluid in the other pipe of the pipes extending from the same switching valve to the same hydraulic jack, and in this case, the function as a check valve is lost. For example, when pressure fluid is supplied to the piping 84, the pilot check valve 92 acts in the same way as a normal check valve. 90
guided by. On the other hand, due to the pressure liquid in the pipe 84,
Since the pilot check valve 94 in the pipe 85 is opened, it no longer functions as a check valve, and liquid flows from the liquid chamber 91 of the hydraulic jack 32 toward the switching valve 78. A similar operation is performed for the other pilot check valves. As described above, the hydraulic jacks 32 and 34 used in the present invention are of the double-acting type, and forces act on the piston rod 33 in both axial directions. Therefore, in order to hold the piston 88 connected to the piston rod 33 in a predetermined position, it is necessary to prevent the liquid from flowing out from each liquid chamber 90, 91, as shown in the figure.
This function is best accomplished using a pilot check valve.

As shown in FIG. 4, an electromagnetically operated unload valve 100 is provided, and the unload valve is operated in conjunction with the switching valves 78 and 80. When the switching valves 78 and 80 are switched from the neutral position shown to either port, they act simultaneously to change from the communication state shown to the disconnection state. As a result, pressurized fluid from pump 70 is sent to the hydraulic jack.
When the pump 70 is constantly rotating to increase the pressure of the liquid, it is undesirable to return the oil to the oil reservoir 82 via the relief valve 102 as this will increase the temperature of the liquid. By arranging the valve 100, such inconvenience is eliminated.

The pump 70, the electric motor 71 that drives the pump 70, the switching valves 78, 80, etc. are installed in the shield body 10 at a position as close as possible to the hydraulic jacks 32, 34.

As shown in FIG. 1, inside the shield body 10,
It is preferable to install an indicator 110 consisting of a pointer 106 and a scale plate 108. According to this indicator 110, the degree of deflection of the head portion 12 with respect to the tail portion 14 becomes clear as will be described later.

The pointer 106 is fixed to a portion 113 located inside the tail portion 14 at the rear end of a support member 112 attached to the head portion 12, and has a
As shown in FIG. 5, a cross hand 107 is provided. On the other hand, the scale plate 108 is fixed to a bar 114 attached to the tail portion 14 and is disposed opposite to the cross needle 107 of the pointer. As described above, the direction correction device of the present invention is for swinging the head portion 12 around the rod 30, and in this case, the position of the fulcrum is approximately in the axial direction of the shield body 10 of the shield body 29. It is assumed to be the center of the length. Therefore, the scale plate 108 is arranged on an arc centered on this fulcrum, and the pointer 10
The cross hand 107 of No. 6 is arranged opposite to the scale plate 108, and both are formed so as to move along the scale plate. As shown in FIG. 5, the scale plate 108 shows the center of the head section when the head section 12 is in a neutral position where it is not deflected with respect to the tail section 14;
Therefore, latitude lines and meridian lines 109 indicate deflection angles in the vertical and horizontal directions from the center point O, which is also the center of the tail part.
It is preferable that this is entered.

In FIG. 1, reference numeral 116 is a television camera, which is installed on the tail portion 14 of the shield body 10 so that an indicator 110 consisting of a pointer 106 and a scale plate 108 is visible. The indicator 110 image captured by this television camera 116 is
It is displayed on a monitor television 118 placed outside the shield body and the propulsion tube.

the rod 30, two hydraulic jacks 32,
34 means that when the piston of each hydraulic jack is located at the center of the cylinder and the lengths of the piston rods in the axial direction of the liquid chambers 90 and 91 provided on both sides of the piston are substantially equal, the head portion 12 is It is set to be in a neutral state in which it is not deflected with respect to the tail portion 14, and is used. Therefore, although the rod 30 could be constituted by a hydraulic cylinder, in use it is set as described above.

To correct the direction of the head portion 12 using the direction correction device of the present invention, proceed as follows. Now, pull the hydraulic jacks 32 and 34 to make the head portion 12 face upward when viewed from the rear of the shield body in the direction of travel, as shown in FIG. For this purpose, the switching valves 78 and 80 are switched so that the first ports 78a and 80a of each switching valve are connected to the branch pipes 74 and 76 and the return pipe 7.
5 and 77, respectively. As a result, the pressure liquid is introduced into the pipes 85 and 87 connected to the hydraulic jacks 32 and 34, respectively, so this pressure liquid enters the liquid chamber 91, while the liquid in the liquid chamber 90 flows from the pipes 84 and 86 to each pipe. After passing through the switching valve, the return pipe 75,
77 and returns to the oil reservoir 82. When the head portion 12 is turned upward by the above operation, the pointer 106 of the indicator 110 moves downward with respect to the scale plate 108, so when the cross hand 107 moves to a predetermined angle, the switching valves 78, 80 to the neutral position.

To direct the head 12 downwards, press the hydraulic jacks 32, 34. For this purpose, each switching valve 7
The second ports 78b and 80b of No. 8 and 80 are communicated with branch pipes 74 and 76 and return pipes 75 and 77, respectively.

Next, to turn it to the right, push the hydraulic jack 32 and pull the hydraulic jack 34 a little. For this purpose, switch the switching valve 78 to the second port 78b,
The switching valve 80 is switched to the first port 80a. To turn leftward, push the hydraulic jack 34 and pull the hydraulic jack 32 slightly. In these cases, the degree of push and pull can be easily determined by observing the indicator 110. In the above operation, by changing the degree of pushing or pulling, it is possible to swing the head diagonally, thus making it possible to swing the head in all directions.

According to the direction correction device of the present invention, the head portion of the shield body is supported at three locations relative to the tail portion, and two of these locations are supported by hydraulic jacks, so the number of hydraulic jacks is lower than that of the conventional direction correction device. This is half the amount compared to the equipment. Therefore, the space for installing the hydraulic jack is reduced, and it can be applied even when the diameter of the shield body is small. When a direction correction device was formed according to the present invention, it was also applicable to a propulsion tube with an outer diameter of 485 mm. Since there are two hydraulic jacks, only two switching valves are required to operate the hydraulic jacks, and the piping can be simplified. In addition, since there are few switching valves to be operated, the operation is easy. Reducing the number of hydraulic jacks by half means that the number of cables required for operation can be reduced by half, especially when remote control is used and the diameter of the shield body is small. , which is extremely preferable for work.

[Brief explanation of the drawing]

Fig. 1 is a sectional view schematically showing the direction correction device of the present invention, Fig. 2 is an explanatory view showing the positional relationship between the rod and the hydraulic jack as seen from the rear in the direction of travel, and Fig. 3 is the head of the hydraulic jack. FIG. 4 is a piping diagram, and FIG. 5 is a front view of the indicator as viewed from the direction of the television camera. 10: Shield body, 12: Head part, 14:
Tail part, 16: Propulsion tube, 18: Partition wall, 30: Rod, 32, 34: Hydraulic jack, 36: Pin,
38: Universal joint, 70: Pump, 78, 80: Switching valve, 90, 91: Liquid chamber, 92, 94, 96, 9
8: Pilot check valve, 106: Pointer, 10
8: Scale plate, 110: Indicator.

Claims (1)

[Scope of Claims] 1. A device for correcting the direction of the head portion of a shield body including a head portion and a tail portion following the head portion, with respect to the tail portion, wherein the head portion is in a neutral state. A rod having a center axis that intersects a vertical line passing through the center of the head at a certain time, one end of which is pivotally supported by the head and the other end connected to the tail through a universal joint. one rod, and two double-acting rods arranged symmetrically with respect to the vertical line, each having one end pivotally supported by the head portion and each other end pivotally supporting the tail portion. a hydraulic jack, a pump for supplying pressure fluid to both of the hydraulic jacks, and a pump disposed between the pump and each of the hydraulic jacks and supplying pressure fluid from the pump to each hydraulic jack. , a switching valve for shutting off, each hydraulic jack is divided into two fluid chambers by a piston sliding in a cylinder, and a pilot check valve is provided in the piping connecting each fluid chamber and the switching valve. is arranged, and the pilot check valve is switched from the liquid chamber to which the piping in which the pilot check valve is located is connected only when pressure is applied to a pipe other than the piping in which the pilot check valve is located. A direction correction device for shield tunnel machines that allows liquid flow to the valve. 2. According to claim 1, the central axis of the rod and the central axes of the two hydraulic jacks are parallel to each other and are located on the same circle at an interval of 120° in the circumferential direction. direction correction device. 3. A device for correcting the direction of the head portion of a shield body, which comprises a head portion and a tail portion following the head portion, with respect to the tail portion, the head portion being in a neutral state. a rod having a central axis intersecting a vertical line passing through the center of the rod, one end of which is pivotally supported by the head portion, and the other end of which is connected to the tail portion via a universal joint; , two double-acting hydraulic jacks arranged symmetrically with respect to the vertical line, each having one end pivotally supported by the head portion and each other end pivotally supporting the tail portion; , a pump that supplies pressure fluid to both the hydraulic jacks, and a switching valve that is disposed between the pump and each of the hydraulic jacks and that supplies or cuts off the supply of pressure fluid from the pump to each of the hydraulic jacks. and an indicator comprising a scale plate fixed to the tail part and a pointer supported by a support member extending from the head part to the tail part and disposed opposite to the scale. direction correction device. 4. The support member has one end fixed to the head portion, the pointer is attached to the other end of the support member, and the pointer is a cross hand, according to claim 3. direction correction device.