JP2013256832A - Open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a corner part to be excavated in excavation by an open shield machine comprising a front part which is provided with a slide earth retaining board in its front end and a tail part which performs installation of a concrete box and has a shield jack disposed rearward at the front in a machine body.SOLUTION: A swing type cutter 18 is provided at each of both corner parts in a lower part inside a cutting edge of a front part 2 of an open shield machine 1 which comprises: the front part 2 provided with a slide earth retaining board 6 in its front end; and a tail part 3 for performing installation of a concrete box and having a shield jack disposed rearward at the front in a machine body.

Description

  The present invention relates to an open shield machine used for an open shield method.

  As is well known, the open shield method is a rational method that takes advantage of the open cut method (open method) and the shield method.

  First, with this open shield construction method, the front end of the rear aircraft is inserted into the rear end of the front aircraft, so that it can be bent at the mutual fitting part so that it can be bent and the direction can be corrected. There is what I did.

An example of this is shown in the following patent document. As shown in FIG. 7, the open shield machine 1 is basically as long as the left and right side wall plates 1a, 1b and the side wall plates 1a, 1b. The shield machine has a front surface, a rear surface, and an upper surface that are formed of a bottom plate 1c that connects between them.
JP-A-10-96234

  As shown in FIG. 8, the open shield machine 1 divides a rectangular machine body into a plurality of parts in the front-rear direction, and the front end of the rear machine body as the tail part 3 is fitted into the rear end of the front machine body as the front part 2, It is possible to bend at the mutual fitting part.

  The front portion 2 mainly performs excavation, and has a front end and an upper surface as open surfaces, and the middle folding jack 4 is disposed in the rectangular body toward the rear and rearward, and is arranged in a plurality of upper and lower stages. .

  On the other hand, the tail portion 3 is used to install the concrete box 8, and the shield jacks 5 are arranged on the left and right, and in a plurality of stages on the upper and lower sides, facing the front toward the rear in the body. In the figure, 6 is a slide retaining plate (movable split blade) provided at the front end of the front portion 2, 7 is a retaining plate provided at the rear end of the tail portion 3, 9 is a strut, and 10 is a press bar (push angle). .

  As shown in FIGS. 9 to 12, the open shield method using such an open shield machine 1 is constructed between the start pit and the arrival pit. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated with a shovel excavator 12, and the shield jack 5 of the open shield machine 1 is extended to start the start pit 11 The open shield machine 1 is moved forward by taking the reaction force against the reaction wall inside, and the first concrete box 8 forming the underground structure is suspended from above, and within the tail part 3 of the open shield machine 1 Set with the strut 9 and the press bar 10 behind the shrunk shield jack 5.

  Further, the start pit 11 is constituted by a retaining wall such as a sheet pile, and in order to start the open shield machine 1, a part of the retaining wall 11 is mirror-cut, but if necessary, a front portion of the starting pit 11 by chemical injection or the like. The ground may be improved.

  Next, similarly, the excavator 12 such as a backhoe excavates the earth and sand from the front surface or the upper surface of the front portion 2 and discharges it to advance the open shield machine 1, and the second concrete box 8 is placed in front of the first concrete box 8. The second concrete box 8 is suspended in the tail portion 3. Thereafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are successively buried in the ground in columns, and back dumped by the dump 14 on the concrete box 8 at the rear, and an open shield machine When 1 reaches the reaching mine 13, it is disassembled and removed to complete the construction. In the figure, 15 is a grout machine.

  By the way, the excavation of the open shield machine 1 is performed not only by extending the shield jack 5 but also by fixing the shield jack 5 and advancing the front part 2 with respect to the tail part 3 by extending the middle jack 4. Push in two stages, jack 5 and half-fold jack 4.

  At that time, if the left or right of the half-folded jack 4 is extended a lot, the front part 2 changes its direction to the opposite side and bends in that direction. Further, if the upper part or the lower part is extended a lot, the front part 2 changes its direction to the opposite side and bends upward or downward. Such curve construction or direction correction is possible.

  As shown in FIGS. 13 to 15, the open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, the front end of the tail part 3 is reduced in diameter, and enters the rear end of the front part 2. A gap is secured between the portion 2 and the tail portion 3, and this becomes a jack portion (broken portion) 16.

  Both the front part 2 and the tail part 3 are rectangular bodies having front, rear and upper surfaces made of a beam plate and a bottom plate between the left and right side wall plates. Among them, the front unit 2 is a sliding earth retaining plate (movable) at the front end. The front partition wall 21 is formed at the center.

  The conventional open shield method is excavated from above while forming a slope in the forward direction of the face with an excavator 12 such as a backhoe inside the bulkhead 21 and both sides of the front part 2 of the shield machine 1. To go.

  At this time, the slide earth retaining plates 6 mounted on both sides of the open shield machine 1 are sequentially extended forward from the upper slide earth retaining plate 6 to loosen the ground on both sides of the open shield machine 1. Suppress.

  In particular, when the open shield machine 1 has a relatively hard ground near the bottom, it is necessary to excavate both corners with an excavator 12 such as a backhoe to reduce thrust. At the lower corner of the face, the bucket portion of the backhoe protrudes from the side of the shield machine, resulting in an excessive moat (excavation) and a risk of collapse in the vicinity.

  As shown in FIG. 13 and FIG. 14, when excavating a natural ground near the bottom plate corner portion of the open shield machine 1 with an excavator 12 such as a backhoe, the natural ground is hard, so as shown in FIG. The excessive digging tends to be large, and when the corner portion is not excavated sufficiently, the unsoiled soil increases the resistance when propelling the shield machine, making it difficult to control the attitude of the shield machine.

  In addition, the excavation part cannot be seen under certain conditions of groundwater, and excessive overexcavation or insufficient excavation of the corner part is likely to occur. Occurs.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to excavate the corner portion without using a backhoe. Since a backhoe is not used for excavation of a corner portion, an object of the present invention is to provide an open shield machine in which a side ground is protected by a retaining plate and can be safely excavated inside a face.

  In order to achieve the above object, the present invention according to claim 1 is to install a front part provided with a slide retaining plate at the front end and a concrete box, and to a shield jack facing rearward to the front part in the machine body. The gist of the present invention is that a swinging cutter is provided at the corner portion inside the blade edge of the front portion of the open shield machine including the tail portion provided with the.

  According to the first aspect of the present invention, by providing a rocking cutter at the corner portion of the shield machine, the lower corner mountain of the shield machine is rubbed with the rocking cutter to reduce the resistance of the corner mountain. be able to.

  Thus, since the corner portion is excavated by the cutting cutter, the corner portion can be excavated without the need for excavation by the backhoe bucket and without reducing the sliding earth retaining plate. Since the earth retaining plate is not reduced, the side ground is protected by the earth retaining plate and can safely be excavated inside the face.

  According to a second aspect of the present invention, two swinging cutters are provided side by side at the left and right corners, and a torque generating jack is connected to each cutter, and the two jacks are used when each jack extends. The gist is that they are arranged so that they can be rotated in different directions with respect to the shaft.

  According to the second aspect of the present invention, when one jack is extended, the other jack is contracted, and as a result, it is possible to express the same torque even when rotating in any direction.

  As described above, the open shield machine according to the present invention has a front part provided with a slide retaining plate at the front end and a concrete box, and a shield jack is arranged at the front part toward the rear in the machine body. In an open shield machine composed of a tail part, the corner part can be excavated without using a backhoe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of an open shield machine of the present invention, FIG. 2 is a vertical side view of the same as above, and the open shield machine 1 is divided into a plurality of bodies in the front-rear direction as in the conventional example, and a tail portion The front end of 3 is reduced in diameter and enters the rear end of the front portion 2, whereby a gap is secured between the front portion 2 and the tail portion 3, and this becomes a jack portion (a middle bent portion) 16.

  Both the front part 2 and the tail part 3 are rectangular bodies having front, rear and upper surfaces made of a beam plate and a bottom plate between the left and right side wall plates. Among them, the front unit 2 is a sliding earth retaining plate (movable) at the front end. The front partition wall 21 is formed at the center.

  Although not shown in the figure, the middle folding jacks are arranged rearward and rearward of the front bulkhead 21 in the body, and are arranged in a plurality of stages.

  The tail part 3 is provided with a jack part partition wall 17 at the front end, which is also not shown in the figure, but the shield jacks are arranged on the left and right sides of the front part toward the rear in the body and arranged in a plurality of stages.

  In the present invention, a swinging cutter 18 is provided at a corner portion inside the blade edge of the front portion 2 of the open shield machine 1.

  The oscillating cutter 18 is provided with a hook-shaped rotating plate 20 at the tip of a torque transmission shaft 19 that is supported on the shaft, and a triangular comb-like cutter 22 having a sharp tip is arranged on the arc from the rotating plate 20. The rods of the torque generating jacks 24a and 24b are connected to the rear part of the torque transmission shaft 19 via the cam 23.

  Two torque generating jacks are equipped. The two torque generating jacks 24a and 24b are arranged so as to be rotated in different directions with respect to the shaft when the respective jacks extend. In FIG. 6, the rotation direction of the torque transmission shaft 19 is reversed when the torque generating jack 24a is extended and when the torque generating jack 24b is extended. When the torque generating jack 24a extends downward and the torque generating jack 24b contracts to the left, the right swinging cutter 18 of the two swinging cutters 18 arranged in the right corner of FIG. 3 rotates counterclockwise. Half a turn.

  Further, when one jack is extended, hydraulic piping is performed so that the other jack contracts. (P / T branch is provided between the three-way switching valve 25 and the jack, and hydraulic piping is provided so that it is connected to the push side / return side of different jacks.)

  By doing so, when one jack is extended, the other jack is contracted, and as a result, it is possible to develop an equivalent torque when rotating in either direction.

  The expansion / contraction operation of the jack is performed manually or automatically (solenoid valve and various sensors). By selecting and operating the rotation direction of the left and right corners, the direction controllability of the shield machine can be improved.

  In the present embodiment, two swing cutters 18 are provided side by side, and the torque generating jack 24a is shared. In both the swing type cutters 18, the cutter 22 rotates in the same direction, and the shield machine lower corner mountain is rubbed with the swing type cutter to reduce the resistance of the corner natural ground.

  In this way, as shown in FIGS. 4 and 5, when excavating with the shovel excavator 12, the corner excavation area α is removed by the rocking cutter 18 instead of the excavator 12. Excavation can be performed, there is no excess excavation, and the collapse of natural ground in the corner can be suppressed.

  Since the corner can be reliably excavated, the excavation resistance can be reduced and the shield machine can be easily controlled.

  Unlike the backhoe shovel excavator 12, the corner portion can be excavated without visual observation, and underwater excavation is also possible.

  In the above-described embodiment, the open shield machine 1 has been described with respect to the case where the machine body is divided into two parts such as the front part 2 and the tail part 3, but the middle machine between the front part 2 and the tail part 3 is not divided. Thus, the present invention can be applied even in the case of three or more divisions.

It is a top view which shows embodiment of the open shield machine of this invention. It is a vertical side view which shows embodiment of the open shield machine of this invention. FIG. 2 is a C arrow view and a D arrow view of FIG. 1. It is a top view of the excavation state of the open shield machine of the present invention. It is a vertical side view of the open shield machine of this invention in the excavation state. It is operation | movement explanatory drawing of a rocking | swiveling cutter. It is a vertical front view which shows the outline | summary of an open shield machine. It is a vertical side view which shows the outline | summary of an open shield machine. It is a side view which shows the 1st process of an open shield method. It is a side view which shows the 2nd process of an open shield method. It is a side view which shows the 3rd process of an open shield method. It is a side view which shows the 4th process of an open shield method. It is a top view which shows excavation by the conventional open shield method. It is a top view which shows the excavation excavation by the conventional open shield method. It is a front view which shows the excavation excavation by the conventional open shield method.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front part 3 ... Tail part 4 ... Middle-fold jack 5 ... Shield jack 6 ... Slide retaining plate 7 ... Earth retaining plate 8 ... Concrete box 9 ... Strut 10 ... Press bar 11 ... Starting pit 12 ... Excavator 13 ... Area 14 ... Dump 15 ... Grout machine 16 ... Jack part 17 ... Jack part bulkhead 18 ... Oscillating cutter 19 ... Torque transmission shaft 20 ... Rotating plate 21 ... Front Bulkhead 22 ... Cutter 23 ... Cams 24a, 24b ... Torque generating jack 25 ... 3-way switching valve

  The present invention relates to an open shield machine used for an open shield method.

  As is well known, the open shield method is a rational method that takes advantage of the open cut method (open method) and the shield method.

  First, with this open shield construction method, the front end of the rear aircraft is inserted into the rear end of the front aircraft, so that it can be bent at the mutual fitting part so that it can be bent and the direction can be corrected. There is what I did.

An example of this is shown in the following patent document. As shown in FIG. 7, the open shield machine 1 is basically as long as the left and right side wall plates 1a, 1b and the side wall plates 1a, 1b. The shield machine has a front surface, a rear surface, and an upper surface that are formed of a bottom plate 1c that connects between them.
JP-A-10-96234

  As shown in FIG. 8, the open shield machine 1 divides a rectangular machine body into a plurality of parts in the front-rear direction, and the front end of the rear machine body as the tail part 3 is fitted into the rear end of the front machine body as the front part 2, It is possible to bend at the mutual fitting part.

  The front portion 2 mainly performs excavation, and has a front end and an upper surface as open surfaces, and the middle folding jack 4 is disposed in the rectangular body toward the rear and rearward, and is arranged in a plurality of upper and lower stages. .

  On the other hand, the tail portion 3 is used to install the concrete box 8, and the shield jacks 5 are arranged on the left and right, and in a plurality of stages on the upper and lower sides, facing the front toward the rear in the body. In the figure, 6 is a slide retaining plate (movable split blade) provided at the front end of the front portion 2, 7 is a retaining plate provided at the rear end of the tail portion 3, 9 is a strut, and 10 is a press bar (push angle). .

  As shown in FIGS. 9 to 12, the open shield method using such an open shield machine 1 is constructed between the start pit and the arrival pit. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated with a shovel excavator 12, and the shield jack 5 of the open shield machine 1 is extended to start the start pit 11 The open shield machine 1 is moved forward by taking the reaction force against the reaction wall inside, and the first concrete box 8 forming the underground structure is suspended from above, and within the tail part 3 of the open shield machine 1 Set with the strut 9 and the press bar 10 behind the shrunk shield jack 5.

  Further, the start pit 11 is constituted by a retaining wall such as a sheet pile, and in order to start the open shield machine 1, a part of the retaining wall 11 is mirror-cut, but if necessary, a front portion of the starting pit 11 by chemical injection or the like. The ground may be improved.

  Next, similarly, the excavator 12 such as a backhoe excavates the earth and sand from the front surface or the upper surface of the front portion 2 and discharges it to advance the open shield machine 1, and the second concrete box 8 is placed in front of the first concrete box 8. The second concrete box 8 is suspended in the tail portion 3. Thereafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are successively buried in the ground in columns, and back dumped by the dump 14 on the concrete box 8 at the rear, and an open shield machine When 1 reaches the reaching mine 13, it is disassembled and removed to complete the construction. In the figure, 15 is a grout machine.

  By the way, the excavation of the open shield machine 1 is performed not only by extending the shield jack 5 but also by fixing the shield jack 5 and advancing the front part 2 with respect to the tail part 3 by extending the middle jack 4. Push in two stages, jack 5 and half-fold jack 4.

  At that time, if the left or right of the half-folded jack 4 is extended a lot, the front part 2 changes its direction to the opposite side and bends in that direction. Further, if the upper part or the lower part is extended a lot, the front part 2 changes its direction to the opposite side and bends upward or downward. Such curve construction or direction correction is possible.

  As shown in FIGS. 13 to 15, the open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, the front end of the tail part 3 is reduced in diameter, and enters the rear end of the front part 2. A gap is secured between the portion 2 and the tail portion 3, and this becomes a jack portion (broken portion) 16.

  Both the front part 2 and the tail part 3 are rectangular bodies having front, rear and upper surfaces made of a beam plate and a bottom plate between the left and right side wall plates. Among them, the front unit 2 is a sliding earth retaining plate (movable) at the front end. The front partition wall 21 is formed at the center.

  The conventional open shield method is excavated from above while forming a slope in the forward direction of the face with an excavator 12 such as a backhoe inside the bulkhead 21 and both sides of the front part 2 of the shield machine 1. To go.

  At this time, the slide earth retaining plates 6 mounted on both sides of the open shield machine 1 are sequentially extended forward from the upper slide earth retaining plate 6 to loosen the ground on both sides of the open shield machine 1. Suppress.

  In particular, when the open shield machine 1 has a relatively hard ground near the bottom, it is necessary to excavate both corners with an excavator 12 such as a backhoe to reduce thrust. At the lower corner of the face, the bucket portion of the backhoe protrudes from the side of the shield machine, resulting in an excessive moat (excavation) and a risk of collapse in the vicinity.

  As shown in FIG. 13 and FIG. 14, when excavating a natural ground near the bottom plate corner portion of the open shield machine 1 with an excavator 12 such as a backhoe, the natural ground is hard, so as shown in FIG. The excessive digging tends to be large, and when the corner portion is not excavated sufficiently, the unsoiled soil increases the resistance when propelling the shield machine, making it difficult to control the attitude of the shield machine.

  In addition, the excavated part cannot be seen under certain conditions of groundwater, and excessive cornering or insufficient excavation of the corner is likely to occur, and the propulsion resistance increases when propelling the shield machine due to loose or unexposed ground on the shield machine side Occurs.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to excavate the corner portion without using a backhoe. Since a backhoe is not used for excavation of a corner portion, an object of the present invention is to provide an open shield machine in which a side ground is protected by a retaining plate and can be safely excavated inside a face.

In order to achieve the above object, the present invention according to claim 1 is to install a front part provided with a slide retaining plate at the front end and a concrete box, and to a shield jack facing rearward to the front part in the machine body. Two swinging cutters are arranged in the left and right corners at the corner part inside the blade edge of the front part of the open shield machine consisting of the tail part provided with a torque, and torque is applied to each of the two arranged cutters. The gist is that the two jacks connected to the generated jacks and connected to the cutters arranged side by side are arranged so as to be rotated in different directions with respect to the shaft when each jack extends. Is.

  According to the first aspect of the present invention, by providing a rocking cutter at the corner portion of the shield machine, the lower corner mountain of the shield machine is rubbed with the rocking cutter to reduce the resistance of the corner mountain. be able to.

  Thus, since the corner portion is excavated by the cutting cutter, the corner portion can be excavated without the need for excavation by the backhoe bucket and without reducing the sliding earth retaining plate. Since the earth retaining plate is not reduced, the side ground is protected by the earth retaining plate and can safely be excavated inside the face.

In addition, two swing cutters are provided side by side at the left and right corners, and a torque generating jack is connected to each cutter. The two jacks are different from each other when the jacks are extended. Since it is arranged so as to be rotated in the direction, when one jack is extended, the other jack is contracted, and as a result, it is possible to express the same torque when rotating in any direction.

  As described above, the open shield machine according to the present invention has a front part provided with a slide retaining plate at the front end and a concrete box, and a shield jack is arranged at the front part toward the rear in the machine body. In an open shield machine composed of a tail part, the corner part can be excavated without using a backhoe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of an open shield machine according to the present invention. FIG. 2 is a vertical side view of the same. The front end of 3 is reduced in diameter and enters the rear end of the front portion 2, whereby a gap is secured between the front portion 2 and the tail portion 3, and this becomes a jack portion (a middle bent portion) 16.

  Both the front part 2 and the tail part 3 are rectangular bodies having front, rear and upper surfaces made of a beam plate and a bottom plate between the left and right side wall plates. Among them, the front unit 2 is a sliding earth retaining plate (movable) at the front end. The front partition wall 21 is formed at the center.

  Although not shown in the figure, the middle folding jacks are arranged rearward and rearward of the front bulkhead 21 in the body, and are arranged in a plurality of stages.

  The tail part 3 is provided with a jack part partition wall 17 at the front end, which is also not shown in the figure, but the shield jacks are arranged on the left and right sides of the front part toward the rear in the body and arranged in a plurality of stages.

  In the present invention, a swinging cutter 18 is provided at a corner portion inside the blade edge of the front portion 2 of the open shield machine 1.

  The oscillating cutter 18 is provided with a hook-shaped rotating plate 20 at the tip of a torque transmission shaft 19 that is supported on the shaft, and a triangular comb-like cutter 22 having a sharp tip is arranged on the arc from the rotating plate 20. The rods of the torque generating jacks 24a and 24b are connected to the rear part of the torque transmission shaft 19 via the cam 23.

  Two torque generating jacks are equipped. The two torque generating jacks 24a and 24b are arranged so as to be rotated in different directions with respect to the shaft when the respective jacks extend. In FIG. 6, the rotation direction of the torque transmission shaft 19 is reversed when the torque generating jack 24a is extended and when the torque generating jack 24b is extended. When the torque generating jack 24a extends downward and the torque generating jack 24b contracts to the left, the right swinging cutter 18 of the two swinging cutters 18 arranged in the right corner of FIG. 3 rotates counterclockwise. Half a turn.

  Further, when one jack is extended, hydraulic piping is performed so that the other jack contracts. (P / T branch is provided between the three-way switching valve 25 and the jack, and hydraulic piping is provided so that it is connected to the push side / return side of different jacks.)

  By doing so, when one jack is extended, the other jack is contracted, and as a result, it is possible to develop an equivalent torque when rotating in either direction.

  The expansion / contraction operation of the jack is performed manually or automatically (solenoid valve and various sensors). By selecting and operating the rotation direction of the left and right corners, the direction controllability of the shield machine can be improved.

  In the present embodiment, two swing cutters 18 are provided side by side, and the torque generating jack 24a is shared. In both the swing type cutters 18, the cutter 22 rotates in the same direction, and the shield machine lower corner mountain is rubbed with the swing type cutter to reduce the resistance of the corner natural ground.

  In this way, as shown in FIGS. 4 and 5, when excavating with the shovel excavator 12, the corner excavation area α is removed by the rocking cutter 18 instead of the excavator 12. Excavation can be performed, there is no excess excavation, and the collapse of natural ground in the corner can be suppressed.

  Since the corner can be reliably excavated, the excavation resistance can be reduced and the shield machine can be easily controlled.

  Unlike the backhoe shovel excavator 12, the corner portion can be excavated without visual observation, and underwater excavation is also possible.

  In the above-described embodiment, the open shield machine 1 has been described with respect to the case where the machine body is divided into two parts such as the front part 2 and the tail part 3. Thus, the present invention can be applied even in the case of three or more divisions.

It is a top view which shows embodiment of the open shield machine of this invention. It is a vertical side view which shows embodiment of the open shield machine of this invention. FIG. 2 is a C arrow view and a D arrow view of FIG. 1. It is a top view of the excavation state of the open shield machine of the present invention. It is a vertical side view of the open shield machine of this invention in the excavation state. It is operation | movement explanatory drawing of a rocking | swiveling cutter. It is a vertical front view which shows the outline | summary of an open shield machine. It is a vertical side view which shows the outline | summary of an open shield machine. It is a side view which shows the 1st process of an open shield method. It is a side view which shows the 2nd process of an open shield method. It is a side view which shows the 3rd process of an open shield method. It is a side view which shows the 4th process of an open shield method. It is a top view which shows excavation by the conventional open shield method. It is a top view which shows the excavation excavation by the conventional open shield method. It is a front view which shows the excavation excavation by the conventional open shield method.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front part 3 ... Tail part 4 ... Middle-fold jack 5 ... Shield jack 6 ... Slide retaining plate 7 ... Earth retaining plate 8 ... Concrete box 9 ... Strut 10 ... Press bar 11 ... Starting pit 12 ... Excavator 13 ... Area 14 ... Dump 15 ... Grout machine 16 ... Jack part 17 ... Jack part bulkhead 18 ... Oscillating cutter 19 ... Torque transmission shaft 20 ... Rotating plate 21 ... Front Bulkhead 22 ... Cutter 23 ... Cams 24a, 24b ... Torque generating jack 25 ... 3-way switching valve

Claims (2)

  The front part of an open shield machine that consists of a front part with a sliding earth retaining plate at the front end and a tail part with a shield jack installed at the front part at the front in the machine body. An open shield machine characterized in that a rocking cutter is provided at the corner inside the blade edge.   Two swinging cutters are provided side by side at the left and right corners, and a torque generating jack is connected to each cutter, and these two jacks have different orientations with respect to the shaft when each jack extends. The open shield machine according to claim 1, which is arranged to be rotated.

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