JP3370399B2 - Half-fold shield machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention A half-fold type shield constructed such that a shield body is divided into a plurality of shields and each of the shields is rotatably connected to each other so that the shield can be bent. It is about an excavator and is about to radically change the traditional folding mechanism. 2. Description of the Related Art In a shield machine for excavating an underground mine such as a tunnel, there is a case where it is necessary to change a direction of excavation and make a turn, for example, when excavating a curved tunnel. Occurs. In particular, recently, the construction of underground tunnels using shield excavators has been concentrated in urban areas, and there are various restrictions when excavating underground tunnels. Is growing.
As such a shield excavator, a so-called center-fold type shield excavator in which a shield body is divided into a plurality of shields and each shield is rotatably connected so that the shield can be bent in the middle is conventionally known. Have been. In the conventionally known center-folding shield excavator, a plurality of shields are configured to be capable of being bent by fitting and connecting adjacent ends of the shields so as to be rotatable with each other. A plurality of jacks called mid-fold jacks are pivotally mounted between adjacent shields, and these jacks are driven with a stroke difference, so that the front shield is rotated with respect to the rear shield, and the shield body is Was broken. The present invention seeks to create an innovative mid-fold type shield excavator in which the conventional mid-fold mechanism is completely changed in such a conventional mid-fold type shield excavator. [0003] First, an outline of a conventional general half-folding shield machine will be described below with reference to FIGS. 8 and 9. FIG. 8 is a longitudinal sectional view of a conventional general half-fold shield machine, and FIG. 9 is a transverse sectional view of a conventional general half-fold shield machine. [0004] In the figures, reference numerals 1 and 2 denote front and rear trunk portions as divided shields for constructing the shield main body so that the shield main body can be bent, and 3 designates a lining on an underground pit to cover the underground pit. Segment. The front body 1 has a rear end fitted to the outer periphery of the front end of the rear body 2 so as to be able to rotate in the horizontal direction with respect to the rear body 2. Reference numeral 15 denotes a cutter head for excavating a cutting face attached to the front body portion 1 so as to be rotatable, and 16 denotes a screw conveyor or the like for carrying and discharging excavated earth and sand of the cutting face excavated by the cutter head 15. An earth removal device, 17 is a shield jack for propelling the shield body while taking a reaction force in the segment 3, 18 is a device for performing lining work of an underground pit by the segment 3, and 19 is a front trunk portion 1.
And a rear jack 2 which is pivotally mounted on the rear body 2 and which is installed in the shield body. As shown in FIG. 9, a plurality of the center folding jacks 19 are provided so as to face each other on the left and right sides in the shield main body. In FIG. 9, 19L represents a plurality of center-floor jacks provided on the left side, and 19R represents a plurality of center-floor jacks provided on the right side. As described above, in the conventional half-fold type shield excavator, a large number of left and right half-fold jacks 19L and 19R are provided in the shield body.
The front trunk portion 1 is rotated with respect to the rear trunk portion 2 by the difference in expansion and contraction of the left and right center folding jacks 19L and 19R, thereby forming a middle folding posture of the shield body. [0005] In the conventional folding machine, a large number of folding jacks had to be installed in the shield body as described above. When such a large number of half-jacks are installed in the shield body, the space inside the shield body, which is the working space, is further narrowed, and it becomes a significant obstacle to smoothly work inside the shield body. . In other words, in the shield body, various equipment such as shield jacks, conveyors, cutter drive motors, etc. are installed so that there is no place for footsteps, and in addition, many half-fold jacks must be installed If so, the effective working space in the shield body will be severely constrained. The present invention has been made in view of the above-mentioned problems associated with the installation of a center-fold jack in the prior art. An object is to provide a folding shield machine. SUMMARY OF THE INVENTION An object of the present invention is to provide a shield body by connecting adjacent ends of a plurality of body parts so as to be rotatable with each other. Supply and discharge of pressurized oil in a half-fold shield excavator that is configured to rotate the front body of the adjacent body relative to the rear body so as to drive the shield body to bend The middle folding back for pushing for applying a pushing force to the front trunk by the expansion force at the time of expansion, and the expansion and contraction due to the supply and discharge of the pressure oil, and is drawn into the front trunk by the expansion force at the time of expansion. A plurality of actuators each including a retractable folding back for applying force are arranged in the circumferential direction of the adjacent end of the body, and the pushing middle folding back and the retracting middle folding back are respectively provided on the front body. Provides push and pull forces When transmitting the pushing force and the retracting force, a pushing force transmitting portion and a retracting force transmitting portion for transmitting the pushing force and the retracting force are provided on the front body portion, and the pushing force and the retracting force are respectively transmitted to the pushing force transmitting portion and the retracting force transmitting portion. A reaction force receiving portion for receiving a reaction force when transmitting the force to the portion is provided on the rear trunk portion. " [0008] Since the center folding type shield machine according to the present invention has such a configuration, one of the center folding backs in the actuator including the pushing middle folding back and the retracting middle folding back is inflated. By driving the plurality of actuators by contracting the other, and applying a pushing force or a retracting force to the front body via a pushing force transmitting unit or a retracting force transmitting unit, each part thereof is Can be arbitrarily pushed forward or backward, and by controlling the drive of the actuator, the front torso is rotated in a predetermined direction with respect to the rear torso, and the shield is rotated. The main body can be bent in a predetermined direction. An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view of a half-fold shield machine of an embodiment of the present invention, FIG. 2 is a cross-sectional view of a half shield shield machine of an embodiment of the present invention, and FIG. FIG. 4 is a longitudinal sectional view of a main part showing a state in which the center folding mechanism is not driven in the example half-folding type shield machine, and FIG. FIG. 5 is a longitudinal sectional view of a main part showing a state in which a drawing force is applied to the center folding mechanism in the center folding type shield excavator according to the embodiment of the present invention. FIG. 6 is a horizontal sectional view of a main part showing a half-fold state of the half-folding shield machine according to the embodiment of the present invention. FIG. It is a basic hydraulic circuit diagram regarding. In FIGS. 1 to 6, parts denoted by the same reference numerals as those in FIGS. 8 and 9 represent the same parts as those in FIGS. In FIG. 1 to FIG. 5, reference numeral 20 denotes a center folding bag for forming an actuator of a center folding mechanism in a center folding type shield excavator. It expands and contracts due to supply and discharge. As is clear from FIG. 1, the center folding back 20 is disposed at the front and rear portions at the adjacent end portions of the front trunk portion 1 and the rear trunk portion 2. The actuator of the folding mechanism is configured. The front folded back 20 is
The inflation force at the time of inflation applies a pushing force to the front body 1, and the rear half-folded bag 20 applies a drawing force to the front body 1 by the inflation force at the time of inflation. Further, as is apparent from FIG. 2, the pair of front and rear middle folding bags 20 are disposed so as to face left and right. In the present embodiment, the center folding backs 20 arranged on the front, rear, left and right are all of the same standard. However, in order to be able to distinguish the positions where they are arranged, in FIGS. Back sign 2
After 0, letters L, R, F, and B are added. That is, when the character added to the reference numeral 20 is L, R
Means the right side, F means the front part, and B means the center folding back part located at the rear part. Therefore, for example, 20L is a left center folded back arranged on the left side, 20F is a front center folded back arranged on the front, and 20RB is a right center folded back arranged on the right side and front. Means folded back 20. Reference numeral 21 denotes a center folding back holding frame formed rearward on the inner periphery of the rear end portion of the front body portion 1, and a pushing force transmitting piece 21a for transmitting the pushing force of the center folding back 20 when inflated.
And a retracting force transmitting piece 21b for transmitting the retracting force of the center folding bag 20 when inflated, and these transmitting pieces 21a, 21b
And an arc-shaped connecting plate 21c for connecting. Since the middle folded back holding frame 21 having such a configuration is formed on the front body 1, when the inner periphery of the rear end of the front body 1 is fitted to the outer periphery of the front end of the rear body 2, the body is The push-in force transmitting piece 21a and the pull-in force transmitting piece 21 of the adjacent end portion of the body portions 1 and 2 and the center folding back holding frame 21
b, the connecting plate 21c forms a center folding back installation space. Reference numeral 22 denotes a reaction force receiving piece protruding from the inner periphery of the front end of the rear trunk portion 2. The reaction force receiving piece 22 transmits the pushing force and the drawing force of the center folding back 20 to the transmission pieces 21a and 21b, respectively. It works to receive. This reaction force receiving piece 22 is shown in FIGS.
When the rear end portion of the front body portion 1 is fitted to the outer periphery of the front end portion of the rear body portion 2, as shown in FIG.
The projection is provided so as to be located between the pushing force transmitting piece 21a and the pulling force transmitting piece 21b. Therefore, the center folding back installation space formed by the adjacent end portions of the body portions 1 and 2 and the center folding back holding frame 21 uses the reaction force receiving piece 22 to form the front installation space 23a and the rear installation space 23a. It is partitioned so that the installation space 23b is formed. In the front installation space 23a, a front center folding back 20F as a pushing center folding back that applies a pushing force to the front body 1 when inflated is installed, and in the rear installation space 23b, the front body folding when inflated. A rear center folding bag 20B is provided as a center folding bag for pulling in, which gives a pulling force to 1. This pair of installation spaces 23a and 23b is
In this embodiment, as is well shown in FIG. 6, the center folding bags 20RF and 20LF as the center folding bags for pushing and the center folding bags as the center folding bags for pull-in are provided so as to be opposed to each other on the left and right. 20 RB and 20 LB are installed. In this manner, the center folding mechanism of the center folding type shield excavator is constructed, but when the center folding mechanism is not driven, FIG.
It is in the initial state as shown in FIG. In this initial state, the front half-fold back 20F and the rear half-fold back 20B are set to have the same volume by adjusting the supply amount of the pressurized oil, and the front body 1 and the rear body 2 The adjacent end face is in a state where the distance a is maintained. In such an initial state, if
When the pressurized oil is supplied to the front center folding bag 20F and discharged from the rear center folding bag 20B, the front center folding bag 20F expands and the rear center folding bag 20B contracts. Then, while the expansion force at the time of expansion of the front center folding back 20 </ b> F is transmitted to the pushing force transmission piece 21 a provided on the front body 1, the reaction force is received by the reaction force receiving piece 22 provided on the rear body 2. Therefore, the expansion force becomes a pressing force and is applied to the front body 1 via the pressing force transmitting piece 21a. As a result, the front trunk 1
As shown in FIG. 4, the portion to which the pressing force is applied is pushed forward, and the distance between the adjacent end face with the rear trunk portion 2 increases from a to b. In the initial state shown in FIG.
If pressurized oil is supplied to the rear half-fold bag 20B and discharged from the front half-fold bag 20F, the rear half-fold bag 20B
Expands, and at the same time, the front center folding back 20F contracts. Then, while the expansion force at the time of expansion of the rear half-fold back 20B is transmitted to the retraction force transmission piece 21b provided on the front body 1, the reaction force is received by the reaction force receiving piece 22 provided on the rear body 2. Therefore, the expansion force becomes the retraction force and is applied to the front body 1 via the retraction force transmission piece 21b. As a result, as shown in FIG. 4, in the rear trunk portion 2, the portion to which the pressing force is applied is retracted rearward, and the distance between the adjacent end surface with the front trunk portion 1 is reduced from a to c. Next, a description will be given of a center folding mechanism driving device for driving such a center folding mechanism with reference to FIG.
, 31 is driven by the prime mover M to drive an actuator consisting of a right front middle folding back 20RF and a right rear middle folding back 20RB and an actuator consisting of a left front middle folding back 20LF and a left rear middle folding back 20LB. Pump 32a for supplying pressure oil generated by the hydraulic pump 31, a supply line 32b for discharging the pressure oil of each actuator, and 33 a supply line The pressure oil in the line 32a is
a or a directional switching valve that switches to lead to the pipeline 34b. When the direction switching valve 33 is operated to switch from the neutral position to the position a, the pressure oil in the supply line 32a is guided to the line 34a through the input port, and the pressure oil in the line 34b is transferred to the hydraulic tank 38 through the tank port. Discharge. When the switching operation is performed from the neutral position to the position b, the pressure oil in the supply line 32a is guided to the line 34b through the input port, and the pressure oil in the line 34a is discharged to the hydraulic tank 38 through the tank port. A right front middle folding back 20RF and a left rear middle folding back 20LB are connected to the pipeline 34a, and a right rear middle folding back 20RB and a left front middle folding back 20LF are connected to the pipeline 34b. In addition, 35 is a variable throttle which can adjust the discharge flow rate of the pressure oil in the discharge line 32b, and 36, 37a and 37b limit the maximum pressure of the supply line 32a, the line 34a and the line 34b, respectively. It is a relief valve for preventing the folding mechanism driving device from being damaged. Since the center folding shield machine according to the embodiment of the present invention has the above-described structure, when the directional control valve 33 is switched to the position a, the hydraulic pump 3 is operated.
1 is supplied from the supply line 32a to the direction switching valve 3
3 to the pipeline 34a, the right front center folded back 2
The same amount of pressure oil is supplied to the 0RF and the left rear folding bag 20LB, and the pressure oil already supplied to the right rear folding bag 20RB and the left front folding bag 20LF is discharged from the pipe 34b through the direction switching valve 33. Conduit 32
b and is discharged to the tank 38 by the same amount. Then, the actuator composed of the right front center folding back 20RF and the right rear center folding back 20RB is driven as shown in FIG. 4, applying a pushing force to the front body 1 and matching the portion with the supply flow rate. Push forward a distance. At the same time, the actuator composed of the left front half-fold back 20LF and the left rear half-fold back 20LB is driven as shown in FIG. Pull back a distance. As a result, the front torso 1 rotates to the right with respect to the rear torso 2 to form a center-folding posture as shown in FIG. When the direction switching valve 33 is switched to the position b, the pressure oil generated by the hydraulic pump 31 is supplied from the supply line 32a through the direction switching valve 33 to the line 3.
4b, supplied to the right rear center folding back 20RB and the left front center folding back 20LF, and the pressure oil already supplied to the right front center folding back 20RF and the left rear center folding back 20LB. From 34 a, it is guided to the discharge line 32 b through the direction switching valve 33 and discharged to the tank 38. As a result, the front torso 1 rotates to the left with respect to the rear torso 2 to form a half-bend posture opposite to that shown in FIG. As described above, in the half-folding type shield excavator of the present embodiment, the conventional method is completely changed so that the shield body can be half-folded by a new idea using a plurality of half-folding backs. It can be folded without using a jack. As a result, it is possible to solve the problem of the related art caused by using the half-fold jack, which restricts the effective working space in the shield body. Further, since a plurality of middle folding bags having the same structure may be used, the number of parts is small, which can contribute to improvement in production efficiency. In this embodiment, an example of a half-fold shield excavator in which an actuator constituted by a half-fold back is arranged symmetrically on the body and the shield main body is bent in the horizontal direction has been described. The actuator can arbitrarily apply a pushing force or a retracting force to the front body to push or pull each part forward or backward by an appropriate distance, or to retract the body. The shield body can be folded in a predetermined direction by arranging a plurality in the circumferential direction and controlling the driving of each actuator. When the shield body is to be bent only in the horizontal direction as in this embodiment,
On the centerline of the center fold, the upper and lower portions of the front trunk portion and the rear trunk portion may be pivotally connected with pins. As is apparent from the above description, the present invention relates to a center folding type shield excavator which "expands and contracts by supply and discharge of pressurized oil and expands and contracts by the expansion force at the time of expansion. An actuator comprising a push-in folding back for applying a pushing force, and a retractable folding back for applying a pull-in force to the front body portion by an inflating force at the time of expansion and contraction due to supply and discharge of pressure oil. Are arranged in the circumferential direction of the adjacent end of the body, and when the push-in folding back and the pull-in folding back apply the pushing force and the pulling force to the forward body, respectively, the pushing force and A pushing force transmitting portion and a retracting force transmitting portion for transmitting the retracting force are provided on the front body portion, and a reaction force when transmitting the pushing force and the retracting force to the pushing force transmitting portion and the retracting force transmitting portion, respectively. After receiving the reaction force receiving part The `` provided in the torso '' configuration eliminates the problem of the prior art, which can be bent without using a center-folding jack, which limits the effective working space in the shield body. Can be. Furthermore, since it is sufficient to use a plurality of folding back bags having the same structure, the number of parts is small,
The effect that the production efficiency can be improved can also be achieved. According to the present invention, the prior art, which is based on the premise that the shield main body is bent using the center-folding jack, is completely changed, and the shield main body is bent by a remarkable technical means using a plurality of folding backs. It is made possible, and the idea is innovative.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a center-folding shield machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the center folding type shield machine according to the embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a main part showing a state in which a center folding mechanism is not driven in the center folding type shield excavator according to the embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a main part showing a state where a pushing force is applied to the center folding mechanism in the center folding type shield excavator according to the embodiment of the present invention. FIG. 5 is a longitudinal sectional view of a main part showing a state where a retracting force is applied to the center folding mechanism in the center folding type shield excavator according to the embodiment of the present invention. FIG. 6 is a horizontal cross-sectional view of a main part showing a half-fold state of the half-fold type shield machine in the embodiment of the present invention. FIG. 7 is a basic hydraulic circuit diagram relating to a half-folding mechanism driving device in the half-folding shield machine according to the embodiment of the present invention. FIG. 8 is a longitudinal sectional view of a conventional general half-fold shield machine. FIG. 9 is a cross-sectional view of a conventional general half-fold shield machine. [Description of Signs] 1 front trunk 2 rear trunk 20 center folded back 21 center folded back holding frame 21L left center folded back 21R right center folded back 21F front center folded back 21B rear center folded back 21a Push force transmission piece 21b Retraction force transmitting piece 21c Connecting plate 22 Reaction force receiving piece

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/06 311

Claims (1)

(57) [Claims 1] A shield main body is formed by fitting and connecting adjacent ends of a plurality of body portions so as to be rotatable with each other. A half-fold shield excavator, which is driven to rotate the front body with respect to the rear body so that the shield body is bent, expands and contracts due to the supply and discharge of pressurized oil and expands during expansion. A center folding back for pushing to apply a pushing force to the front body by force, and a retracting to give a drawing force to the front body by the expanding force at the time of expansion and contraction due to the supply and discharge of pressurized oil. A plurality of actuators each including a half-fold back are arranged in the circumferential direction of the adjacent end of the trunk, and the pushing half-fold back and the retracting half-fold back apply a pushing force and a pulling force to the front trunk, respectively. The pushing force and the pulling force. A push force transmitting portion and a retracting force transmitting portion for transmitting and transmitting the force are provided on the front trunk portion, and the reaction force receiving the reaction force when transmitting the pushing force and the retracting force to the pushing force transmitting portion and the retracting force transmitting portion, respectively. A half-fold shield excavator characterized in that a force receiving portion is provided on a rear trunk portion.