JP3499976B2 - Discharge amount adjustment device for shield machine - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to soil discharge amount adjustment device of the shield machine for boring upwards. 2. Description of the Related Art In recent years, in the construction of a shaft connecting the ground and an underground tunnel, a construction method has been proposed in which a shield excavator is excavated upward from inside the underground tunnel. Since no construction site is required, there is an advantage that construction is possible even when it is difficult to secure land, especially in an urban area. [0003] Figure 7 is an example of upward shield machine, a is the cutter, b is the casing, c is a segment. The earth and sand excavated by the cutter a is collected in a funnel-shaped chamber d and discharged downward through an earth discharging pipe e provided at the center. In the discharge pipe e, the ribbon screw f is rotated by the motor g, and the earth and sand in the chamber d is transported downward by the rotation and gravity, and then dropped through the cylindrical reaction force casing h. The reaction casing h is
At the same time as discharging the earth and sand, the propulsion jack i can receive propulsion reaction force to enable propulsion. The lower end of the reaction force casing h is supported on a gantry in the underground tunnel. When the upward excavation is completed for a predetermined distance, the reaction force casing h is extended, and the segment c is assembled by the erector j. [0004] The discharge pipe e is provided with a gear mechanism k for transmitting the driving force of the motor g to the ribbon screw f. A gate valve 1 is provided below the gear mechanism k for adjusting the amount of soil discharged through the earth discharging pipe e. In the gate valve 1, a plate-shaped valve element is slid so as to partition the inside of the discharge pipe e, whereby the inside of the discharge pipe e is opened and closed, and the amount of earth and sand sent from the ribbon screw f is appropriately adjusted. Only the reaction force casing h. [0005] Further, as such an earth removal amount adjusting apparatus, there is an apparatus using a ball valve in addition to the gate valve l. [0006] [SUMMARY OF THE INVENTION Incidentally, in the case of upward shield machine, for drilling soil is discharged in the direction of gravity, easy blockage in the discharge drainpipe e is generated by the action of soil pressure.
For this reason, it is desirable to dispose the earth discharging amount adjusting device such as the gate valve 1 as close as possible to the chamber d, that is, as high as possible. However, the ribbon screw f is inserted into the earth discharging pipe e, and the gate valve l Because of the configuration in which the valve element partitions the inside of the discharge pipe e, the gate valve l must be arranged at the lower part of the gear mechanism k without the ribbon screw f. As a countermeasure against this, it is conceivable that the earth discharging amount adjusting device is constituted by an elastic film provided on the inner wall of the earth discharging pipe. In this case, for example, a shaft portion is provided on a ribbon screw (or a screw shaft or the like), and the elastic film is expanded and contracted by the action of fluid pressure (for example, air pressure) on a radially outer side thereof, thereby forming a connection with the ribbon screw. It is possible to open and close the discharge passage or the discharge pipe between the discharge passages, and at the same time, to position the discharge adjustment device near or above the chamber. However, the properties of the excavated ground usually differ from place to place, and when the pressure inside the chamber suddenly rises suddenly due to this ground change, the elastic membrane using the fluid pressure cannot cope with the situation and is forced to open. As a result, there is a drawback that the earth is erupted and accurate earth removal cannot be performed. Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a shield excavation amount adjusting device for a shield excavator capable of preventing eruption of earth and sand and performing accurate earth removal. To provide. [0010] The order to achieve the above object invention SUMMARY OF] is a dumping amount adjusting apparatus of a shield machine for boring upwards, for discharging the excavated earth and sand downwardly A discharge pipe, an elastic film provided on the discharge pipe, which expands and contracts by the action of fluid pressure to open and close the discharge pipe, and an elastic film provided on the elastic film for mechanically holding the open / close position. Holding means. According to the above construction, when the elastic film expands and contracts and is at a predetermined opening / closing position, the holding means mechanically holds the elastic film at the opening / closing position. Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a vertical sectional front view showing the entire shield excavator . As shown, the shield excavator 1 has a cutter 2 at an upper end thereof to enable upward excavation .
The cutter 2 is rotatably supported by a shield casing 3 and is rotated by a cutter drive motor 4. The shield casing 3 has an outer cylinder 5 extending vertically and a funnel-shaped chamber 6 provided at an upper end of the outer cylinder 5. Chamber 6
An earth discharging pipe 7 for discharging the excavated earth and sand is connected to a central portion of the lower end. The discharging pipe 7 extends along the axial direction of the outer cylinder part 5, and has a split structure here, and a lower end thereof is connected to the reaction force casing 8. Reaction force casing 8
, As described above, is formed on the splittable tubular is spliced with the excavation of the shield machine 1. Inside, the earth and sand dropped from the discharge pipe 7 falls directly to the underground tunnel. The discharge pipe 7 has an upper end formed therein and connected to the chamber 6, an outlet pipe 9, a pinch valve 10 connected to a lower part of the outlet pipe 9, and a lower part of the valve casing 11. It is mainly constituted by an extension pipe 12 which is connected and extends to the reaction force casing 8. Outlet pipe 9
A partition plate 13 is connected to the outer peripheral portion of the
The interior is partitioned. An erector 15 for assembling the segment 14 is rotatably attached to a lower portion of the extension pipe 12.
6 is appropriately rotated and moved by a positioning motor 17 provided in the motor 6. A plurality of propulsion jack support beams 16 are fixed to the extension pipe 12 and are radially extended, and a propulsion jack 17 a for pushing up the partition plate 13 and propelling the shield casing 3 is provided at each end thereof. . When the shield casing 3 is propelled, the tail seal 18 at the lower end of the shield casing 3 slides on the segment 14. A plurality of support jacks 19 are provided along the inner peripheral wall of the outer cylinder 5, which abut against the upper end of the segment 14 to receive a propulsion reaction force and assist the excavator 1 when the reaction force casing 8 is added. Support. FIGS. 1 and 3 are a vertical sectional front view and a cross-sectional plan view of a soil discharging amount adjusting device according to the present invention. The earth removal amount adjusting device 20 has the above-described pinch valve 10 connected to a lower portion of the outlet pipe 9. The pinch valve 10 has a valve casing 11 composed of a flange plate 21 positioned above and below, and an intermediate cylinder 22 fixed between the flange plates 21. The flange plate 21 has a ring-shaped groove 23 opened to the intermediate cylinder 22 side, and a ring-shaped holding piece 24 protruding toward the intermediate cylinder 22 inside the groove 23 in the radial direction. The holding piece 24 air-tightly holds the upper and lower ends of the elastic film 26 between the holding piece 24 and an obliquely formed corner 25 of the intermediate cylinder 22. The elastic film 26 is made of an elastic material such as rubber and is formed in a cylindrical shape having a relatively large thickness, and is normally in contact with the straight pipe portion 27 of the intermediate cylindrical body 22 and has the same inner diameter as the outlet pipe 9. By introducing a fluid pressure, in this case, an air pressure, into the cylinder 22, it is expanded or bulged radially inward as indicated by a phantom line to close the discharge pipe 7. Intermediate tube part 2 of intermediate cylinder 22
Numeral 8 is bulged radially outward in a round shape, and is provided with an air pressure introduction port 29 so that air pressure is introduced from a pressure guiding tube 29a. The pressure guiding pipe 29a is connected to an air pressure supply device (not shown) such as a compressor. The pressure guiding tube 29a is also provided with a pressure sensor 30a for measuring the pressure of the fluid chamber 30 between the intermediate cylinder 22 and the elastic film 26. As shown in FIG. 1, below the pinch valve 10, a transfer means for appropriately transferring earth and sand in the earth discharging pipe 7, that is, a driving device 32 for rotationally driving the paddle screw 31 is provided. The drive device 32 is meshed with a casing 33 connected to the lower flange plate 21 of the pinch valve 10 via the connection pipe 12a, a drive motor 34 attached to the casing 33, and a pinion gear 34a of the drive motor 34. It mainly includes the driving member 35. The driving member 35 is rotatable around the center of the discharging pipe 7 by upper and lower bearings 34b arranged in a circumferential direction,
The ring body 35a housed inside the casing 33 is in sliding contact with the uneven outer surface of the seal ring 36 to prevent intrusion of earth and sand. In particular, the seal ring 36 forms a part of the earth discharging pipe 7 or the extension pipe 12 together with the upper and lower end plate portions 33a of the casing 33 and the connecting pipe 12a. A spoke 37 extends from the ring body 35a toward the center, and the spoke 3
The tip of 7 is fixed to a boss 38, and the boss 38 is fixed to a shaft portion 39 of the paddle screw 31 to substantially drive the paddle screw 31. Referring to FIGS. 1 and 2, paddle screw 3
The first shaft portion 39 extends in the axial direction of the discharging pipe 7, and has an upper end portion rotatably supported by a bearing portion 40 of the cutter 2. And the shaft part 3 of the paddle screw 31
A plurality of paddle members 41 projecting outward in the radial direction are fixed to 9. The paddle member 41 protrudes relatively short to the vicinity of the inner wall surface in the discharge pipe 7, but extends longer than these in the chamber 6. In particular, a paddle member 41 is provided at a portion of the pinch valve 10 that passes through the elastic film 26.
Is provided, and the collar 43 whose vertical movement is restricted by the upper and lower rings 42 is rotatably mounted. Then, as shown, the elastic film 26 abuts on the collar 43 when inflated, and stops the collar 43 with respect to the rotating shaft portion 39. Note that a paddle member 44 similar to the paddle screw 31 is also fixed to the outlet pipe 9. These paddle members 41,
The cross-section of 44 is now a downwardly contracting triangle. Referring particularly to FIGS. 1 and 3, the elastic film 26 of the pinch valve 10 is provided with a holding means 50 for mechanically holding the open / close position or the expanded / contracted state of the elastic film 26. Provided. The holding means 50 includes the elastic film 2
6, a holding member 51 disposed outside the holding member 51.
Are formed in a rectangular plate shape with hard rubber, plastic, or the like, and each pair is provided on the opposite side of the elastic film 26. The pair of holding members 51 are separated from each other, are bridged by a curved connecting member 52, and a rod 54 of a hydraulic cylinder 53 is connected to an intermediate portion of the connecting member 52. The rod 54 is inserted into the fluid chamber 30 from the insertion port 55 provided in the intermediate pipe part 28 so as to be airtight and freely insertable / removable, and the cylinder part 56 of the hydraulic cylinder 53 is attached to a mount member 57. The mount member 57 is formed in an L shape, and its base end is firmly fixed to the flange plate 21 by welding or the like. The insertion port 55 of the intermediate pipe 28 is hermetically sealed by a seal member 55a. As shown particularly in FIG. 4, a cap 58 made of an elastic material such as a relatively thin rubber is fixed to the outer surface of the elastic film 26. Inside the cap 58,
The holding body 51 is accommodated with a certain gap. The cap body 58 has a flange portion 59 fixed to the elastic film 26, an inner shape adapted to the holding body 51 and formed to have a larger size, and a connection member formed in a hole 61 formed in the end plate portion 60. 52 are inserted with a gap. A metal contact plate 62 is embedded in the inner surface of the cap body 58. The distance between the elastic film 26 and the contact plate 62 of the end plate portion 60 is made larger than the thickness of the cap body 58, whereby the holding body 51 is accommodated in the cap body 58 with a margin and the elastic film 26 expands. -The contraction operation is not restricted. The holding member 51 is operated by the hydraulic cylinder 53 so that the opposing members move close to and away from each other. This operation is performed cooperatively or in synchronization with the supply of air pressure to the fluid chamber 30. Therefore, in order to enable this cooperative operation, each hydraulic cylinder 53 and the pressure sensor 30a are connected to a computer-type control device 63 (see FIG. 1).
An earth pressure gauge 45 (see FIG. 2) for detecting the pressure in the chamber 6 is also connected to the control device 63. Next, the operation of the above embodiment will be described. The earth and sand excavated by the cutter 2 is sent into the chamber 6, and is cut or divided by the rotating paddle member 41, and is collected in the outlet pipe 9 by gravity. Then, also in the outlet pipe 9, cutting is performed by the paddle members 41 and 44, and the earth and sand is sequentially dropped downward. And, the earth discharging passage 7a between the elastic film 26 of the pinch valve 10 and the collar 43,
It sequentially passes between the spokes 37 of the drive member 35 and the like, that is, passes through the discharge pipe 7 and falls in the reaction force casing 8.
The earth and sand that has fallen to the lower end of the reaction casing 8 is received by a conveyor or the like, conveyed through an underground tunnel, and discharged. As described above, the paddle screw 31 is different from a ribbon screw or the like in a conventional screw conveyor in that the earth and sand are not actively transported but cut off to promote gravity transfer, thereby achieving a relatively high earth pressure. This is to prevent blockage at the time. The cutting of the earth and sand is also performed by the cooperative action of the paddle members 41 and 44 of both the paddle screw 31 and the outlet pipe 9. In order to adjust the amount of earth and sand discharged, that is, the amount of earth removed, air pressure is introduced and derived from the fluid chamber 30 between the intermediate cylinder 22 and the elastic film 26, and the elastic film 26 is appropriately expanded and contracted. This is performed by opening and closing the inside of the discharge pipe 7. At this time, as will be described later in detail, the holder 51 only moves in accordance with the deformation of the elastic film 26. When the elastic film 26 is completely expanded, the phantom line in FIG. 1 or FIG. 5 is obtained, and the discharging passage 7 a in the discharging pipe 7 or between the discharge pipe 7 and the collar 43.
Is closed, thereby restricting the falling of sediment. In this manner, with the elastic pad 26, the rotating paddle screw 31 can be opened and closed to open and close the earth discharging passage 7a there between, so that the earth discharging amount adjusting device 20 can be moved above the driving device 32 or the chamber 6 can be opened and closed. It can be located nearby. Then, blockage of the earth and sand in the lower portion of the chamber 6 and the inside of the earth discharging pipe 7 is prevented, and stable and continuous earth discharging and operation can be performed. Since the collar 43 is provided, the elastic film 2
Since there is no direct contact between the shaft 6 and the shaft portion 39, abrasion of the elastic film 26 due to sliding is avoided. The pressure in the chamber 6 can be controlled by adjusting the amount of earth removal. Here, opening and closing of the earth discharging passage 7a is mainly performed by controlling expansion and contraction or air pressure of the elastic film 26, and at this time, the holding body 51 only moves in accordance with the deformation of the elastic film 26. Specifically, when the elastic film 26 moves in the radial direction during the expansion and contraction process, the hydraulic cylinder 53 becomes free, and the holding body 51 moves by being pushed by the contact plate 62 or the elastic film 26 in the cap body 58. . When the air pressure becomes constant and the elastic film 26 is fixed in a predetermined expanded state, that is, in the open / close position, the hydraulic cylinder 53 fixes the holding body 51 to the position at that time by hydraulic pressure, and the elastic film 2
6 is mechanically held at the open / close position. Alternatively, the following control is also possible.
That is, the position of the elastic film 26 corresponding to the value of the air pressure is input to the control device 63 in advance, the stroke of the hydraulic cylinder 53 is performed according to this value, and the holding body 51 is moved in accordance with the position of the elastic film 26. Let it. With this arrangement, the opening and closing position of the elastic film 26 is determined by the air pressure, while the position is mechanically or rigidly held by the holding body 51 and the hydraulic cylinder 53 and the like. The position is fixed. Therefore, especially when fully closed, the internal pressure of the chamber 6 rises rapidly,
Even when a force is applied to the elastic film 26 to open the elastic film 26, the hydraulic cylinder 53 or the like functions as a tension rod to reliably maintain the elastic film 26 in the fully closed state, and to spout the earth and sand. Excessive soil removal is also prevented. Further, even when the elastic film 26 has an intermediate opening, the opening can be held more accurately, the positioning accuracy of the elastic film 26 can be improved, and the adjustment accuracy of the earth removal amount can be improved. Next, a modified embodiment will be described. As shown in FIG. 6, in this modified embodiment, the holding means 50 has a rack and pinion mechanism 65 for moving the holding body 51. The rack 66 connected to the connecting member 52 is meshed with the pinion gear 67 and driven from outside by a motor 68. Motor 68
Is attached to a mount member 69 extending from the flange plate 21. The motor 68 is connected to the control device 63 as described above, and the rotation of the motor 68 is controlled by an appropriate amount. With such a configuration, it is possible to achieve the same operation and effect as described above. As another modified embodiment, although not shown, the pinch valve 10 can be added to the lower part of the driving device 32 of the paddle screw 31, and the elastic film 26 can be provided with the same holding means 50 as described above. In this way, even if one of the pinch valves 10 is broken, the other pinch valve 10 can adjust the amount of earth removal. In this case, since the paddle screw 31 is not inserted into the lower pinch valve 10, it is not necessary to provide a pair of holding bodies 51 so as to straddle the paddle screw 31, and a configuration in which one holding body 51 is provided on each side may be used. In addition to the above embodiment, the present invention can be modified and changed in various modes.
3 can be replaced with a pneumatic cylinder or the like. The present invention exhibits the following excellent effects. (1) It is possible to prevent the eruption of earth and sand and perform accurate earth removal. (2) Excessive earth removal can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional front view showing one embodiment of an earth removal amount adjusting device according to the present invention. 2 is a vertical sectional front view showing the entire shield machine. FIG. 3 is a cross-sectional plan view of the earth removal amount adjusting device according to the present invention. FIG. 4 is a vertical sectional front view showing a mounting state of a holding body. FIG. 5 is a cross-sectional plan view showing a fully closed state of the earth removal amount adjusting device according to the present invention. FIG. 6 is a longitudinal sectional front view showing a modified embodiment. 7 is a longitudinal sectional front view showing an entire conventional shield machine. [Description of Signs ] 1 Shield excavator 7 Discharge pipe 7a Discharge passage 20 Discharge amount adjusting device 26 Elastic film 31 Paddle screw 46 Supply pipe 47 Elastic band 48 Storage section 49 Pores 50 Supply pipe 51 Supply passage 52 Supply pipe

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Wanashi 111-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Maju Industry Co., Ltd. Inside the Aichi Factory (72) Inventor Kenichi Kaneko 1-25-chome Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Construction Co., Ltd. (72) Inventor Michika Kaneko 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Tetsuya Sugito 1-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Taisei Construction Co., Ltd. (72) Inventor Shuichi Hara 2-82-2 Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. (72) Inventor Kiyoshi Tanaka 2-2-2 Koraku, Bunkyo-ku, Tokyo No. Goyo Construction Co., Ltd. (72) Inventor Shin Sato 2-5-2, Koraku, Bunkyo-ku, Tokyo Goyo Construction Co., Ltd. (56) References JP-U 4-65893 (JP, U) JP-U 58-112228 ( JP, U) JP 6-54075 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/12 E21D 3/00

Claims (1)

(57) A dumping amount adjusting apparatus of Claims 1] shield machine for excavating upward, and discharging clay pipe for discharging the excavated earth and sand downwardly, the exhaust drainpipe An elastic film that is provided and expands and contracts by the action of fluid pressure to open and close the inside of the discharge pipe;
Provided the elastic membrane, drilling shield is characterized in that a holding means for mechanically holding the closing position
A machine for adjusting the amount of earth removed in advance .