JP4373906B2 - Shield excavator - Google Patents

Description

  The present invention relates to a shield excavator, and more particularly, to a shield excavator that can effectively exhaust gas entering through a tail seal.

When excavating a shield tunnel using a shield machine, harmful gases in the soil may invade the shield tunnel machine or enter the tunnel tunnel via the shield machine. Sometimes. As a technique for preventing such harmful gas from entering a shield machine or a tunnel mine, for example, there is a harmful gas leakage inflow preventing device for a shield machine disclosed in Patent Document 1.
This harmful gas leakage inflow prevention device is provided with an elastic seal material on the bulkhead side (front side in the direction of travel) from the tail seal, and an annular chamber is formed between the elastic seal material and the tail seal. By pressing the elastic sealing material, the sealing machine body is brought into close contact with the outer peripheral surface of the shield machine body so as to be in a sealed state. In this harmful gas leakage inflow prevention device, pressurized air and muddy water are supplied into the annular chamber, thereby improving the sealing performance of the elastic sealing material and preventing gas from entering the mine.
Japanese Patent No. 2582724

  However, in the harmful gas leakage inflow preventing device disclosed in Patent Document 1, the harmful gas accumulated in the annular chamber is indirectly discharged in accordance with the discharge of muddy water in the annular chamber. For this reason, there was room for improvement in terms of efficiently discharging harmful gases. Further, the configuration such as the harmful gas leakage inflow preventing device disclosed in Patent Document 1 cannot detect the presence or absence of harmful gas in the annular chamber, and cannot know the existence status of harmful gas. was there.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable shield gas excavation to be efficiently discharged of harmful gases that are to enter the shield excavator and to detect the intruded gas relatively easily. Is to provide a machine.

  The shield machine according to the present invention that has solved the above problems is provided with a cylindrical shield machine body portion, and is provided spaced apart in the circumferential direction along the inner peripheral surface of the shield machine body portion so as to generate a reaction force from the segment. A shield excavator comprising a plurality of shield jacks for advancing the shield machine body, wherein the shield jack is relative to the jack body attached to the shield machine body and the jack body. Each of the shield jacks adjacent to each other in the plurality of shield jacks is in contact with the rear segment, and the rod is attached to the tip of the rod and is in contact with the segment. Sometimes it is the front side of the shield machine body between adjacent spreaders, and the inner peripheral surface side of the shield machine body Includes a partition portion for partitioning the predetermined region from the other regions, the partition portion, the shield machine barrel, and by sucking the fluid from the space surrounded by adjacent spreader, characterized in that it comprises a suction discharge portion for discharging.

  In the shield machine according to the present invention, when harmful gases in the soil try to enter the shield machine, the intrusion path is mainly on the front side of the shield machine body between adjacent spreaders. And on the inner peripheral surface side of the shield machine body. Therefore, the shield machine according to the present invention includes a partition portion that is on the front side of the shield machine body between adjacent spreaders and that partitions a certain region on the inner peripheral surface side of the shield machine shell from other regions. I have. By providing this partition part, the harmful gas etc. which are going to penetrate | invade into a shield machine from the soil can be effectively collected in the space enclosed by a partition part, a shield machine trunk | drum, and an adjacent spreader. Further, since the partition portion is provided with a suction / discharge portion that sucks and discharges the fluid from the above space, harmful gas and the like can be effectively discharged.

  Moreover, a partition part consists of a pair of partition wall formed by dividing | segmenting into two, A pair of partition wall can be set as the aspect attached to the spreader which adjoins, respectively.

  Thus, when the pair of partition walls are attached to the adjacent spreaders, when the phases of the forward and backward directions of the rods of the shield jack overlap, they are surrounded by the partition part, the shield machine body part, and the adjacent spreader. A space is formed. Invasion of harmful gas is likely to occur during digging by the shield machine, and when the shield machine is digging, the phases of the shield jack rods are overlapped. Therefore, when the harmful gas is likely to enter, the harmful gas can be suitably collected in the space.

  Furthermore, it can also be set as the aspect by which the gas detection means is provided in the suction discharge part. If it does in this way, the harmful gas discharged | emitted from the suction discharge part can be detected easily, accurately, and effectively.

  The suction / discharge section includes a suction port provided in the partition wall, a suction unit that sucks fluid from the suction port, a hose that connects the suction port and the suction unit, and a hose that follows the advance and retreat of the spreader. It can also be set as the aspect which has the hose reel to guide. In this way, the hose can be guided by the hose reel while following the advance and retreat of the spreader. Therefore, the hose can be prevented from being scattered in the shield machine body, and the space in the shield machine body can be effectively used.

  Furthermore, a partition part can also be set as the aspect provided only in the upper part among the internal peripheral surfaces in a shield machine body part. Harmful gas is lighter than air, so by providing the partition only on the upper part of the inner peripheral surface of the shield machine body, it collects harmful gas efficiently while preventing enlargement of equipment be able to.

  According to the shield excavator according to the present invention, it is possible to efficiently discharge harmful gas that is about to enter the shield excavator, and it is possible to detect the intruded gas relatively easily. Become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side sectional view of a shield machine according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is an enlarged view of an arrow A portion in FIG. It is an expansion perspective view for performing operation explanation which shows the relation between the advance and retreat movement of a spreader, and a partition part.

  As shown in FIG. 1, the shield excavator 1 </ b> A according to the present embodiment includes a shield machine body 10. The shield machine body portion 10 includes a front body portion 11 and a rear body portion 12, and the front body portion 11 is attached to the rear body portion 12 so as to be swingable. Between the front body part 11 and the rear body part 12, a folding jack 13 is provided. A plurality of the middle folding jacks 13 are provided apart from each other in the circumferential direction of the shield machine body portion 10, and the swing angle of the front body portion 11 is adjusted by extending the middle folding jack 13 at a predetermined position. The direction of excavation in the shield excavator 1A is controlled.

  A shield cutter 14 is provided at the front end portion of the front body portion 11 in the forward direction (opposite to the rear body portion 12 side). The shield cutter 14 includes a disc-shaped cutter portion 14a and a drive portion 14b having a circular front shape. A plurality of bits 14c are attached to the surface of the cutter unit 14a, and a natural ground is excavated by the bits 14c when the cutter unit 14a rotates.

  The drive part 14b is provided in the inner position of the front trunk | drum 11 in the back of the cutter part 14a, and is connected with the cutter part 14a via the bearing. A drive motor 14d is provided at the rear of the cutter unit 14a and the drive unit 14b, and the cutter unit 14a is rotated by the drive motor 14d. The drive unit 14b is fixed to the front trunk unit 11 during excavation work, and the shield cutter 14 moves forward together with the shield machine trunk unit 10.

  A mud pipe 16 and a mud pipe 17 are provided in the shield machine body 10. One end of each of the mud feeding pipe 16 and the mud discharging pipe 17 is disposed between the cutter part 14 a and the driving part 14 b in the shield cutter 14. From the mud pipe 16, high-concentration mud water is supplied between the cutter unit 14 a and the drive unit 14 b to increase the pressure of the shield cutter 14. Further, the mud discharge pipe 17 discharges the high-concentration mud water supplied from the mud feed pipe 16 between the cutter unit 14a and the drive unit 14b and the muddy water made of excavated soil so as to lower the pressure of the shield cutter 14. I have to. Thus, the pressure of the shield cutter 14 is adjusted by the amount of water supplied from the mud pipe 16 and the amount of mud discharged from the mud pipe 17. Further, a gap is appropriately formed between the front trunk portion 11 and the cutter portion 14a, and a small amount of muddy water flows out from these gaps and is filled between the shield excavator 1A and the tunnel.

  An erector 15 is provided at the rear portion of the rear trunk portion 12. The erector 15 sequentially assembles the segments S in the holes formed by the shield cutter 14. A tail seal 18 is provided on the inner peripheral surface of the rear portion of the rear trunk portion 12. The tail seal 18 closes the gap between the segment S and the rear trunk portion 12, and prevents fluid such as water from entering the natural ground during excavation work.

  A plurality of shield jacks 19 are attached to a connection portion between the front body portion 11 and the rear body portion 12. As shown in FIG. 2, the plurality of shield jacks 19 are provided apart from each other in the circumferential direction along the inner circumferential surface of the rear trunk 12, and the shield machine trunk 10 is advanced by taking a reaction force from the segment S. The plurality of shield jacks 19 are equally arranged so that the intervals between the adjacent shield jacks 19, 19 are all the same.

  As shown in FIG. 1, the shield jack 19 includes a cylinder 19a, a rod 19b, and a spreader 19c. The cylinder 19a is fixed to the inner peripheral surface of the shield machine body 10 with the advancing / retracting rod 19b facing rearward, and the advance / retreat direction of the rod 19b is substantially parallel to the axial direction of the shield machine body 10. As shown in FIG. 3, a spreader 19c is attached to the tip (rear end) of the rod 19b. The rod 19b and the spreader 19c are connected via a ball joint 19e, and the spreader 19c can swing about 3 degrees.

  As shown in FIG. 4, the spreader 19c has a flat plate shape having a curved portion 19d corresponding to the shape of the inner peripheral surface of the rear barrel portion 12, and as the rod 19b expands and contracts, the curved portion 19d becomes an inner portion of the rear barrel portion 12. Slide along the circumference. A rear plane (hereinafter referred to as “rear face”) of the spreader 19c is brought into contact with the segment S, and a front plane (hereinafter referred to as “front face”) is connected to the rod 19b of the shield jack 19 via the ball joint 19e. Yes.

  The rods 19b of the plurality of shield jacks 19 extend and contract independently. Therefore, a predetermined distance D is provided between the adjacent spreaders 19c so as not to interfere with each other. That is, when the adjacent spreaders 19c, 19c,... Are in contact with the segment S in the plurality of shield jacks 19, 19,. In the present embodiment, the gap formed by the peripheral surface corresponds to a certain region.

  The harmful gas that has entered through the tail seal 18 is most likely to enter the shield machine body 10 through this gap. Therefore, in the shield excavator 1A, a partition portion 20 is provided that partitions this gap from other regions on the front side (shield cutter 14 side) of the shield machine body portion 10, and is a space surrounded by the partition portion 20 and the spreader 19c (hereinafter referred to as the space). Contain toxic gases and liquids in a “toxic gas enclosure”. Then, the fluid such as the contained gas is intensively sucked and discharged by the suction / discharge section. Hereinafter, the partition part 20 and the suction / discharge part will be described in detail.

  As shown in FIGS. 2 and 4, the partition portion 20 includes a pair of partition walls 21 and 21 that are separately attached to two adjacent spreaders 19 c and 19 c. The pair of partition walls 21 and 21 are provided on the front surface of the spreader 19c, and a substantially rectangular casing with the radially outer surface (the surface on the inner peripheral surface side of the shield machine body 10) open is equally divided into two. Make the shape. One of the end portions (circumferential end portions) 21c at the position of the split surface divided into two is closed by sliding in contact with the other. Further, a guide plate 21a is provided at the circumferential end 21c. The guide plate 21a has a sliding surface parallel to the axial direction of the shield machine body 10, and guides the sliding of the partition walls 21 when the phases of the spreaders 19c and 19c overlap each other. The shape of the radially outer end portion (sliding contact end portion) 21b of the partition wall 21 corresponds to the shape of the inner peripheral surface of the shield machine barrel portion 10, and is in sliding contact with the inner peripheral surface of the rear barrel portion 12. Block.

  In the present embodiment, as shown in FIG. 2, the partition portion 20 is provided only in the upper half portion of the rear trunk portion 12 (upper half in the vertical direction with reference to the shield excavator 1A during excavation work). 20 is provided. This is because, since the specific gravity of harmful gas is often lighter than air, if the partitioning portion 20 is provided only in the upper half, harmful gas can be effectively collected.

  Next, the suction / discharge unit in the present embodiment will be described. The partition wall 21 is formed with a through-hole that is a suction port portion 22. A suction pipe 23 made of a flexible hose is fixed to the suction port portion 22 in a communicating state. As shown in FIGS. 1 and 2, the suction pipe 23 extends to the cylinder 19 a of the shield jack 19 in a slack state and is connected to the collecting pipe 24. The slack of the suction pipe 23 is such that the length of the advancing / retreating cylinder 19a can be allowed. As shown in FIG. 2, the collecting pipe 24 is arranged in a semi-annular shape so as to straddle the plurality of cylinders 19a, and is attached to each cylinder 19a. All of the plurality of suction pipes 23 connected to each partition 20 are connected to the collecting pipe 24.

  Further, the collecting pipe 24 is connected to a blower 25 disposed rearward as shown in FIG. 1, and an exhaust gas pipe 27 communicating with the inside of the ventilation passage 26 is laid on the blower 25. . The blower 25 is mounted on a cart (not shown) and moves following the shield machine body 10 that moves forward. In the present embodiment, the blower 25 corresponds to the suction means in the present invention.

  A gas detector 28 corresponding to a gas detection means is provided at the tip of an exhaust gas pipe 27 communicating with the inside of the ventilation passage 26. The gas detector 28 detects the harmful gas sucked by the blower 25 after being sealed in the harmful gas sealing space. By providing the gas detector 28 at the tip of the exhaust gas pipe 27, it is possible to effectively detect harmful gases sent from the blower 25 in a concentrated manner. Although not shown, the gas detector 28 is also provided outside the partition wall 21 described above (inside the rear trunk portion 12). This gas detector is used for determining whether or not harmful gas is leaking into the shield machine body 10. As described above, the suction / discharge section according to the present embodiment includes the suction port section 22, the suction pipe 23, the collecting pipe 24, the blower 25, the exhaust gas pipe 27, and the gas detector 28.

  Operation | movement of 1 A of shield excavators comprised as mentioned above is demonstrated. In the shield machine 1A, the segments are sequentially assembled by the erector 15 from the state where the segments for one round of the shield tunnel are assembled. In a state where the segments for one round of the shield tunnel are assembled, the rod 19b is extended in all of the plurality of shield jacks 19.

  From this state, when assembling the segment, the rod 19b of the shield jack 19 corresponding to the position where the segment is attached is contracted by the erector 15 to form a space for arranging the segment. Meanwhile, in the shield jack 19 corresponding to a position other than the position where the segment is attached, the rod 19b is extended, and the spreader 19c is brought into contact with the already assembled segment.

  When the segment to be attached is assembled, the rod 19b of the shield jack 19 corresponding to this segment is slightly extended, and the spreader 19c is brought into contact with the attached segment. Then, in order to attach the segment to a position next to the attached segment, the rod 19b of the shield jack 19 corresponding to the attached segment is contracted.

  Thereafter, the segments for one turn are assembled by attaching the segments over one turn in the circumferential direction of the tunnel through the same process. When the assembly of the segment S for one round is completed, the rods 19b of all the shield jacks 19 are slightly extended, and the spreader 19c is in contact with the segment S. From this state, when the shield jack 19 is extended, the cylinder 19a presses the spreader 19c against the segment S to take a reaction force and the shield machine body 10 moves forward. Thus, the tunnel tunnel progresses.

  In this way, in the process of the shield machine body 10 moving forward, the harmful gas staying in the natural ground is caused by the gap between the inner peripheral surface of the shield machine body 10 and the segment S, and in the shield machine body 10 and the tunnel mine. Trying to break into. Hazardous gas that tries to enter is prevented from entering by the tail seal 18, but a small amount of the harmful gas passes through the tail seal 18 and reaches the spreader 19 c. If this harmful gas enters the shield machine body 10 and the mine shaft, it may cause an adverse effect of the excavation work.

  In this regard, in the shield machine 1A according to the present embodiment, the pair of partition walls 21 and 21 provided in the adjacent spreaders 19c and 19c are combined with each other, and the partition portion 20 is configured to be a closed space. A harmful gas enclosure space is formed. Therefore, the harmful gas that has entered from the gap formed between the adjacent spreaders 19c, 19c and the inner peripheral surface of the rear trunk portion 12 is enclosed in the harmful gas sealing space.

  In particular, while the shield machine 1A is digging, the shield machine 1A moves forward in the ground, so that harmful gas intrusion is likely to occur while the shield machine 1A is digging. ing. Further, while the shield machine 1A is digging, since all the shield jacks 19 shift from the substantially contracted state to the extended state, the phases of the rods 19b in each shield jack 19 are in an overlapped state. . When the phases of the rods 19b are overlapped, the harmful gas enclosure space is formed by the partition wall 21 and the like, so that the harmful gas enclosure space can be formed when the harmful gas easily enters. it can. Therefore, invasion of harmful gas can be effectively prevented.

  Further, the harmful gas enclosed in the harmful gas enclosure space is discharged to the ventilation passage 26 by driving the blower 25. For this reason, the harmful gas that has passed through the tail seal 18 can be quickly and intensively discharged to the ventilation passage 26 by the blower 25. Accordingly, it is possible to effectively prevent harmful gas from entering the shield machine body 10 and the tunnel.

  In addition, when the toxic gas is a flammable gas such as methane gas that may induce an explosion, it stays in the shield machine body 10 to a certain concentration (5% to 15%, especially 9.5%). This increases the risk of explosion. When the gas staying state in the natural mountain is a thick gas reservoir, the gas harmfully invading into the shield machine body 10 may be mixed with air to be in the above-mentioned fixed range. Therefore, by exhausting toxic gases quickly and intensively to the ventilation passage as in the shield excavator 1A, the gas concentration can be promptly exhausted before reaching the certain range, thereby reducing the risk of explosion. Can be resolved.

  Furthermore, in the shield machine 1 according to the present embodiment, a gas detector 28 for detecting harmful gas is provided. When harmful gas is detected by the gas detector 28, an alarm can be issued to urge the workers in the tunnel to evacuate, or to pay attention to the work so as not to cause sparks. .

  Here, when the harmful gas is detected by the gas detector 28, in the shield excavator 1A, since the harmful gas is intensively discharged to the ventilation passage 26 in a high concentration state, the harmful gas is detected by the gas detector 28. It can be detected relatively easily and with high accuracy. Furthermore, since the shield excavator 1A is configured to intensively capture harmful gas and discharge it to the ventilation passage 26, the ventilation passage 26 is large enough to ventilate the entire shield machine body 10. There is no need for equipment, and a small-scale one is sufficient, so the merit from the cost side is also high.

Subsequently, a shield excavator according to a second embodiment of the present invention will be described. Since the basic configuration of the shield excavator is the same as that of the shield excavator described above, the differences will be mainly described. In addition, about the same structure, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
5 is a side cross-sectional view of the shield machine body portion centering on the shield jack, FIG. 6 is an enlarged side cross-sectional view showing the arrow B portion of FIG. 5, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. It is sectional drawing along the internal peripheral surface of a shield machine body part.

  As shown in FIG. 5, the shield excavator 1 </ b> B according to the present embodiment is provided with a hose reel 29 for winding the suction pipe (hose) 23. The hose reel 29 is fixed to the cylinder 19 a, and the suction pipe 23 is drawn out and wound in a direction substantially parallel to the axial direction of the shield machine body 10. Further, the hose reel 29 is adapted to exert a biasing force in the direction in which the suction pipe 23 is wound up. Therefore, when the rod 19b is extended, the suction pipe 23 is pulled out against this urging force, and when the rod 19b is retracted, it is wound around the hose reel 29. The suction pipe 23 is connected to a collecting pipe 24 via a hose reel shaft, and the collecting pipe 24 is connected to a blower 25. The collecting pipe 24 is connected to a shaft pipe of a hose reel 29 attached to each cylinder 19a. Thus, the hose reel 29 guides the suction pipe (hose) 23 while following the advance / retreat of the spreader 19c.

  As shown in FIG. 7, the suction pipe 23 is connected to the partition portion 20, but is not connected to all the partition walls 21, and instead of the pair of partition walls 21 and 21 forming the partition portion 20. It is sufficient if it is connected to either one. Therefore, in this Embodiment, as shown in FIG. 8, the spreader 19c to which the suction piping 23 is connected and the spreader 19c which is not connected are provided. In the spreader 19c to which the suction pipe 23 is connected, the suction pipe 23 is connected at the center from the partition walls 21 and 21 at both ends in the circumferential direction and is wound around the hose reel 29 as a single suction pipe 23. . The hose reel 29 is attached only to the shield jack 19 provided with the suction pipe 23.

  Moreover, in the shield excavator 1B according to the present embodiment, a hinge 30 with a spring is attached to the front surface of the spreader 19c. As shown in FIG. 6, the spring hinge 30 is formed by connecting two long plates so as to be swingable with one long side as a fulcrum. One elongated plate of the hinge 30 with the spring is fixed in the vicinity of the upper end in the radial direction of the front surface of the spreader 19c. Further, a rectangular flat plate-shaped sealing member (rubber plate) 31 is attached to the other long plate. Further, a spring that biases the seal member (rubber plate) 31 to be pressed against the inner peripheral surface of the rear trunk portion 12 is attached to the hinge 30 with the spring. As shown in FIG. 8, the seal member 31 extends from the central portion of the spreader 19c to the partition wall 21, and seals the sliding gap between the spreader 19c and the rear trunk portion 12.

  In the shield machine 1B according to the present embodiment having the above configuration, when the shield machine 1 moves forward, the harmful gas or the like is enclosed in the harmful gas enclosure space as in the first embodiment. The invasion of harmful gas into the shield machine 1 and the tunnel is prevented.

  As described above, according to the shield excavator 1B according to the present embodiment, the same operation and effect as the shield excavator 1A described above are obtained, and the hose reel 29 is provided, so that the suction pipe 23 does not become slack. The narrow space in the shield machine body 10 can be used efficiently. Further, in the shield excavator 1B, the seal member 31 seals the gap between the spreader 19c and the rear trunk portion 12 by the action of the hinge 30 with the spring, so that gas can be prevented from entering through this gap.

  Furthermore, in the shield machine 1B according to the present embodiment, a hose reel 29 for winding the suction pipe 23 is provided. By providing such a hose reel 29, the suction pipe 23 can be smoothly taken in and out. Further, by accommodating the suction pipe 23 in the hose reel 29, it is possible to prevent the suction pipe 23 from being scattered in the shield machine 1 and the tunnel. Therefore, it is possible to prevent the suction pipe 23 from getting in the way in the shield machine 1 and the tunnel, thereby ensuring a wide and safe working area.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, eight shield jacks 19 are provided, but other numbers may be used. Moreover, although the partition part 20 is provided only in the upper half of a perpendicular direction, it can also be provided only in the upper side from the upper half, and conversely, it can also be provided in the lower side from the upper half. Furthermore, in the said embodiment, although the partition part 20 is provided in the spreader 19c, it provides in the state which fixed the partition plate to the shield body part 10 between the spreaders 19c of the adjacent shield jack 19, and encloses harmful gas A space can also be formed.

It is a sectional side view of the shield machine which concerns on 1st embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is an enlarged view of the A arrow part in FIG. It is an expansion perspective view for performing operation explanation which shows the relation between the advance and retreat movement of a spreader, and a partition part. It is a sectional side view of the shield machine body part centering on the shield jack concerning a second embodiment. It is an expanded side sectional view which shows the B arrow part of FIG. It is VII-VII sectional drawing of FIG. It is sectional drawing along the internal peripheral surface of a shield machine body part.

Explanation of symbols

1A, 1B ··· Shield excavator 10 ··· Shield machine body 18 ··· Tail seal 19 ··· Shield jack 19a · · · Cylinder 19b · · · Rod 19c ··· · Spreader 20 ··· Partitioning portion 21 ··· Partitioning wall portion 23 ··· Suction piping 24 · · · Collecting tube 25 · · · Blower 28 · · · Gas detection S ... Segment

Claims (5)

A plurality of shields having a cylindrical shield machine body and spaced apart in the circumferential direction along the inner peripheral surface of the shield machine body to advance the shield machine body by taking a reaction force from a segment A shield excavator with a jack,
The shield jack is attached to a jack body attached to the shield machine body, a rod that moves relative to the jack body in the axial direction of the shield machine body, and a tip of the rod; A spreader in contact with the segment;
When each spreader of shield jacks adjacent to each other in the plurality of shield jacks abuts a rear segment, it is the front side of the shield machine body between the adjacent spreaders, and the shield machine body A partition part that partitions a constant region on the inner peripheral surface side from other regions,
A shield excavator comprising a suction discharge unit that sucks and discharges fluid from a space surrounded by the partition part, the shield machine body part, and the adjacent spreader. The partition part is composed of a pair of partition walls formed by being divided into two parts,
The shield excavator according to claim 1, wherein the pair of partition walls are respectively attached to the adjacent spreaders.   The shield excavator according to claim 1 or 2, wherein gas suction means is provided in the suction / discharge section.   The suction discharge unit includes a suction port portion provided in the partition wall, a suction unit that sucks fluid from the suction port unit, a hose that connects the suction port unit and the suction unit, and the hose that is connected to the spreader. The shield excavator according to claim 2, further comprising a hose reel that guides the vehicle while following and retreating.   The shield machine according to any one of claims 1 to 4, wherein the partition portion is provided only on an upper portion of an inner peripheral surface of the shield machine body portion.

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