Obstacle breaking device and obstacle breaking method

Abstract

To provide an obstacle crushing apparatus capable of rapidly crushing an obstacle to a size capable of being taken in by the screw conveyor provided to the back of a chamber even when a large-sized obstacle is taken in the chamber, and an obstacle crushing method.SOLUTION: An obstacle breaking device 100 for breaking an obstacle taken into a chamber of a shield machine includes an outer pipe 30 extending to a chamber 10 through an insertion hole 13 of a partition wall 12, an inner pipe 40 inserted into the outer pipe 30 and provided with a high-pressure injection nozzle 47, a rotating device 50 for rotating the inner pipe 40, a first opening and closing valve 74 attached to a rear side of the outer pipe 30 and configured to open and close the outer pipe 30, and a pushing rod 90 inserted into the outer pipe 30 through the first opening and closing valve 74. A static crushing agent 80 arranged in an outer pipe 30 is pushed into a bottomed hole H of an obstacle G by a pushing rod 90.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to an obstacle breaking device and an obstacle breaking method. [Background technology]

[0002] When constructing a shield tunnel by digging a shield machine, there is a trend toward longer and deeper shield tunnels, and as a result, there are cases where unexpected strata are encountered during shield construction.In such unexpected strata, it is common for unexpectedly large boulders and other objects to be drawn into the chamber at the back of the cutter head through the opening. If large boulders or other objects that are taken into the chamber in this way remain inside the chamber and are not discharged onto a screw conveyor extending to the rear of the shield tunneling machine's interior through a shutter gate or the like located below the bulkhead that forms the chamber, this may hinder continued tunneling. As such, large boulders and large concrete shells remaining in the ground can become obstacles to the shield tunneling machine when it excavates, and therefore are referred to as "obstacles" in this specification.

[0003] Therefore, what is needed is an obstacle crushing device and method that can quickly crush large obstacles into sizes that can be taken in by the screw conveyor at the back of the chamber, even if the large obstacles are taken into the chamber.

[0004] Patent Document 1 proposes a slurry shield machine that removes gravel obstacles that the machine encounters during excavation from the front of the excavation. This slurry shield machine is equipped with a cutter face that is rotatably mounted at the front end of the shield frame and has the required number of slits for catching debris, a mud feeding means to a pressure chamber defined on the back side of the cutter face, and a mud discharge means from this pressure chamber, and a water jet nozzle is attached to the cutter face with an opening facing the outer periphery of the front face. High-pressure water is sprayed from a water jet nozzle attached to the cutter face into the ground surrounding a gravel obstacle in front of it, eroding the ground and, as the ground is eroded, moving the gravel obstacle from its front position toward the outer periphery of the cutter face, removing the gravel obstacle. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-127378 Summary of the Invention [Problem to be solved by the invention]

[0006] The slurry shield machine described in Patent Document 1 is said to be able to easily remove gravel obstacles in front of the cutter face from the front position of the cutter face toward the outer periphery in a short period of time. However, it does not disclose a solution to the above-mentioned problem, i.e., a means for quickly breaking down large obstacles into pieces that can be taken in by the screw conveyor at the back of the chamber when they are taken into the chamber.

[0007] The object of the present invention is to provide an obstacle crushing device and an obstacle crushing method that can quickly crush large obstacles into a size that can be taken in by a screw conveyor at the back of the chamber, even when the large obstacles are taken into the chamber. [Means for solving the problem]

[0008] In order to achieve the above object, one aspect of the obstacle breaking device according to the present invention is: An obstacle breaking device for a shield tunneling machine, the obstacle breaking device comprising: a main body; a cutter head that rotates forward in the excavation direction of the main body; and a partition wall that forms a chamber together with the cutter head inside the main body, the obstacle breaking device breaking up an obstacle that has been taken into the chamber, an outer tube extending into the chamber through a through hole formed in the partition wall; an inner tube inserted into the outer tube and equipped with a high-pressure injection nozzle; a rotating device that rotates the inner tube; a first opening / closing valve attached to the rear of the outer tube to open and close the outer tube; a push rod that is inserted into the outer tube via the first opening / closing valve, The tip of the outer tube is placed inside a bottomed hole created by drilling the obstacle with high-pressure jet from the high-pressure jet nozzle that extends from the end of the outer tube and rotates, and the inner tube is pulled out from the outer tube, and the static crushing agent placed in the outer tube is pushed into the bottomed hole by the pushing rod.

[0009] According to this embodiment, the outer tube extends into the chamber through an insertion hole opened in the partition, the inner tube equipped with a high-pressure injection nozzle is inserted into the inside of the outer tube so that the high-pressure injection nozzle protrudes from the tip of the outer tube, the tip of the outer tube is disposed inside the bottomed hole created by drilling the obstacle with the high-pressure injection, and the inner tube is pulled out in a state where the static crushing agent disposed in the outer tube is pushed into the bottomed hole with a pushing rod, so that the obstacle can be crushed by the expansion pressure (expansion force) generated when the static crushing agent expands inside the bottomed hole. In addition, by inserting a push rod into the outer tube through the first opening / closing valve attached to the rear of the outer tube, the static crushing agent arranged in the outer tube can be pushed into the bottomed hole by the push rod by opening the first opening / closing valve, and when the pushing of the static crushing agent is completed, the first opening / closing valve can be closed to prevent muddy water etc. in the chamber from spraying into the machine through the outer tube. The obstacles that have been crushed to smaller sizes can be smoothly discharged onto the screw conveyor through a shutter gate or the like provided in the chamber.

[0010] Here, obstacles include boulders, concrete slabs, etc. Geologically, a "boulder" refers to a gravel with a particle size of 256 mm or more, but in this specification, "boulder," "large boulder," and "large obstacle" refer to an obstacle of such size that it is difficult to discharge it from the chamber onto a belt conveyor in, for example, an earth pressure shield tunneling machine.

[0011] Another aspect of the obstacle breaking device according to the present invention is An insertion tube including a second opening / closing valve that can open and close the insertion hole is attached to a position on the back surface of the partition wall corresponding to the insertion hole, and the outer tube and the inner tube inserted into the insertion tube extend into the chamber through the insertion hole, with the second opening / closing valve in an open position.

[0012] According to this aspect, the outer tube and inner tube are inserted into an insertion tube including a second opening / closing valve attached at a position corresponding to the insertion hole on the back surface of the partition wall, and extend through the insertion hole into the interior of the chamber via the second opening / closing valve in the open position. This allows the outer tube and inner tube to communicate between the interior of the chamber and the interior of the machine on the back surface of the chamber, which have different air pressures, and when the outer tube is not inserted into the insertion hole, the interior of the chamber can be completely isolated from the interior of the machine.

[0013] Another aspect of the obstacle breaking device according to the present invention is A first pre-bender is attached to the rear side of the first opening / closing valve in the outer pipe, A second pre-bender is attached to the rear side of the second opening / closing valve in the insertion tube, The outer tube is inserted into the second prepender while being sealed between the outer tube and the second prepender, and is inserted into the insertion tube and the second opening / closing valve, The push rod is inserted into the first prepender while being sealed between the first prepender and the outer tube and the first opening / closing valve.

[0014] According to this aspect, the pusher rod is inserted into the outer tube while being sealed between the first prepender attached to the back side of the first opening / closing valve in the outer tube, and the static crushing agent is pushed into the bottomed hole, thereby realizing the pushing of the static crushing agent by the pusher rod while ensuring watertightness. Also, the outer tube is inserted into the insertion tube while being sealed between the second prepender attached to the back side of the second opening / closing valve in the insertion tube, and the outer tube is pushed into the chamber, thereby ensuring watertightness, and the outer tube can be extended from the inside of the machine into the chamber through the partition.

[0015] Another aspect of the obstacle breaking device according to the present invention is A guide rod is attached to the back surface of the partition or the insertion tube, A feeding device for feeding out the outer tube is provided so as to be slidable relative to the guide rod.

[0016] According to this aspect, the feeding device for feeding the outer tube is slidably mounted on a guide rod attached to the back of the partition wall, etc., so that the feeding device can feed the outer tube into the chamber while performing the function of preventing buckling, in which the outer tube is pushed into the inside of the machine due to the pressure inside the chamber.

[0017] Another aspect of the obstacle breaking device according to the present invention is A buckling prevention device is attached to the back surface of the partition or to the insertion tube, and the buckling prevention device is attached to a part of the outer tube.

[0018] According to this aspect, the buckling prevention device attached to the back surface of the bulkhead, etc., is attached to a part of the outer tube, so that even if there is no guide rod, for example, the buckling prevention device can prevent buckling in which the outer tube is pushed into the inside of the aircraft due to the pressure inside the chamber.

[0019] Furthermore, one aspect of the obstacle crushing method according to the present invention is to 1. A method for crushing an obstacle taken into a chamber in a shield tunneling machine comprising: a main body; a cutter head that rotates forward in the excavation direction of the main body; and a partition wall that forms a chamber together with the cutter head inside the main body, the method comprising: an outer tube extending into the chamber through an insertion hole formed in the partition wall; an inner tube having a high-pressure jet nozzle at its tip is inserted into the outer tube, a bottomed hole is drilled in the obstacle by high-pressure jet from the rotating high-pressure jet nozzle, and the tip of the outer tube is disposed in the bottomed hole; The method is characterized in that the inner pipe is pulled out from the outer pipe, a static crushing agent is placed in the outer pipe, the static crushing agent is pushed into the bottomed holes with a pushing rod, and the bottomed holes are filled with a solidification material.

[0020] According to this embodiment, the outer tube is extended into the chamber through an insertion hole opened in the partition, the inner tube equipped with a high-pressure injection nozzle is inserted into the inside of the outer tube so that the high-pressure injection nozzle protrudes from the tip of the outer tube, the tip of the outer tube is positioned inside the bottomed hole created by drilling the obstacle with the high-pressure injection, the inner tube is then pulled out, a static crushing agent is placed in the outer tube and pushed into the bottomed hole with a pushing rod, and the bottomed hole is filled with a solidifying material, thereby crushing the obstacle with the expansion pressure (expansion force) generated when the static crushing agent expands inside the bottomed hole. Obstacles that have been crushed into smaller pieces can be smoothly discharged onto a screw conveyor through a shutter gate or the like installed in the chamber. Therefore, even if large boulders or other large objects are taken into the chamber, the boulders or other large objects can be quickly crushed and discharged as smaller pieces, allowing the shield tunneling machine to continue excavating. [Effects of the Invention]

[0021] According to the obstacle breaking device and obstacle breaking method of the present invention, even if a large obstacle is taken into the chamber, the obstacle can be broken down into a size that can be taken in by the screw conveyor at the back of the chamber. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B are diagrams illustrating an example of an obstacle breaking device according to an embodiment in a pre-formation state and boulders to be broken in a chamber. [Figure 2] FIG. 10 is a diagram showing an example of an obstacle breaking device according to an embodiment, illustrating a state in which the tip of the fed inner pipe has reached a boulder. [Figure 3] 10 is a diagram showing a state in which an example of an obstacle breaking device according to an embodiment is drilling a boulder to form a bottomed hole. FIG. [Figure 4] FIG. 10 is a diagram showing a state in which a separate outer tube (extension tube) is attached to the other end of the outer tube. [Figure 5] FIG. 10 is a view showing a state in which a drawn tube is inserted into a separate outer tube. [Figure 6] 10 is a view showing a state in which the pull-out tube connected to the other end of the inner tube is pulled out and the inner tube is pulled out from the outer tube. FIG. [Figure 7] This is a diagram showing a state in which a static crushing agent is placed in a separate outer tube and is ready to be pushed in by a pushing rod. [Figure 8] FIG. 10 is a view showing a state in which the static crushing agent is pushed into the bottomed hole by a pushing rod inside the outer tube. [Figure 9] FIG. 10 is a diagram showing a state in which a solidifying material is filled in a bottomed hole. [Figure 10] 10 is a view showing a state in which the outer tube is being pulled out from the bottomed hole and the insertion tube. FIG. [Figure 11] FIG. 10 shows the state in which boulders are crushed by the expansion of static crushing agents. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an obstacle breaking device and an obstacle breaking method according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components are designated by the same reference numerals, and redundant description may be omitted.

[0024] [Obstacle Breaking Device and Obstacle Breaking Method According to the Embodiment] An example of an obstacle breaking device and an obstacle breaking method according to an embodiment will be described with reference to FIGS. FIG. 1 shows an example of an obstacle breaking device according to an embodiment in a pre-formation state and a boulder to be broken in a chamber. FIG. 2 shows an example of an obstacle breaking device according to an embodiment, showing the tip of the delivered inner tube reaching the boulder. FIG. 3 shows an example of an obstacle breaking device according to an embodiment drilling a boulder to form a bottomed hole. FIG. 4 shows a separate outer tube (extension tube) attached to the other end of the outer tube. FIG. 5 shows a drawing tube being inserted into the separate outer tube. FIG. 6 shows the drawing tube connected to the other end of the inner tube being withdrawn, and the inner tube being withdrawn from the outer tube. FIG. 7 shows a separate outer tube with a static crushing agent disposed therein, ready for pushing with a pusher rod. FIG. 8 shows a state in which the static crushing agent has been pushed into the bottomed hole by the pusher rod inside the outer tube. FIG. 9 shows a state in which the bottomed hole is filled with a solidification material. Furthermore, Figure 10 shows the state in which the outer tube is being pulled out from the bottomed hole and the insertion tube, and Figure 11 shows the state in which the boulders are being crushed by the expansion of the static crushing agent.

[0025] Figures 1 to 11 show an enlarged view of a portion of a bulkhead 12 that forms a chamber 10 together with a cutter head (not shown) that rotates forward in the excavation direction of the main body of a shield tunneling machine that excavates the ground, and also show an enlarged view of a portion of the chamber 10 of the bulkhead 12 and a portion of the interior of the machine 15.

[0026] Below the partition wall 12 is a shutter gate (not shown) that can be opened and closed freely, and inside the machine 15, a screw conveyor (not shown) extends rearward from the shutter gate, allowing the excavated soil that has been stirred and plastically fluidized inside the chamber 10 to be discharged.

[0027] The following description will be given assuming that an unexpectedly large boulder G (an example of an obstacle) has been taken into chamber 10 at the back of a cutter head (not shown) through an opening in the cutter head. Note that the boulder G in the illustrated example is large enough that it cannot be discharged by a screw conveyor through a shutter gate (not shown), and since the boulder G remaining inside chamber 10 can make it difficult for the shield machine to continue excavating, the following description will describe an apparatus and method for crushing the boulder G inside chamber 10 to a size that can be discharged, thereby enabling the shield machine to continue excavating.

[0028] 1, a through-hole 13 is formed in the bulkhead 12, and one end 20a of an insertion pipe 20 equipped with a second on-off valve 24 is attached by welding or bolting to a position on the back surface 12a of the bulkhead 12 corresponding to the through-hole 13. The diameter of the through-hole 13 may be, for example, about 2 to 3 inches.

[0029] A second pre-bender 28 is attached to the other end 20b of the insertion tube 20.

[0030] 1, the second on-off valve 24 is closed to prevent muddy water, groundwater, etc. in the chamber 10 from leaking into the interior of the machine 15. In this way, the state in which the outer pipe 30 is not inserted into the insertion pipe 20 occurs during the process of assembling the obstacle breaking up device 100 as shown in FIG. 1, or at the stage in which the outer pipe 30 is pulled out of the insertion pipe 20 into the interior of the machine 15 after the breaking up of boulders G is completed, and therefore the second on-off valve 24 is closed each time.

[0031] As shown in Figure 2, an outer tube 30 is inserted into the insertion tube 20 via a second pre-pender 28 attached to the other end 20b, and the outer tube 30 is inserted through a second opening / closing valve 24 which is open in the X1 direction, and one end 31 (tip) of the outer tube 30 is extended in the X2 direction into the interior of the chamber 10 through the insertion hole 13 of the partition wall 12, thereby forming an obstacle crushing device 100.

[0032] As shown in the illustrated example, the outer pipe 30 is sealed between the second prepender 28 and inserted into the second prepender 28 and the insertion tube 20, with a portion of it protruding into the chamber 10, making it possible to send the outer pipe 30 into the chamber 10 while preventing muddy water, etc. in the chamber 10 from leaking into the interior of the machine 15.

[0033] An inner pipe 40 is inserted inside the outer pipe 30, a joint pipe 45 is connected to one end 41 (tip) of the inner pipe 40, and a high-pressure injection nozzle 47 (rotating nozzle) is connected to the joint pipe 45, so that at least the high-pressure injection nozzle 47 protrudes from one end 31 of the outer pipe 30.

[0034] One end 41 (rear end) of the inner tube 40 is attached to the rotation axis of the rotation device 50, and when the rotation device 50 is driven, the outer tube 30 does not rotate, but the inner tube 40 rotates around its axis in the X3 direction (see Figure 3).

[0035] The inner pipe 40 may be a single pipe or a double pipe, and a double pipe configuration is used when the rotational force of the rotation device 50 is transmitted to the high-pressure injection nozzle 47 using air as power, and a single pipe configuration is used when the high-pressure injection nozzle 47 is rotated by water pressure.

[0036] 2, a high-pressure water supply device 55 is attached below the rotation device 50, and the high-pressure water supply device 55 is connected to the hollow inside of the inner pipe 40. One end 55a of the high-pressure water supply device 55 is adapted to be attached to the end of a water supply hose or a water supply pipe (not shown).

[0037] Although not shown in the figures, a guide rod may be arranged below the insertion tube 20 on the back surface 12a of the partition wall 12, a feeding device that moves along the guide rod may be attached to the guide rod, the inner tube, etc. may be held by the feeding device, and the inner tube, etc. may be fed toward the chamber side as the feeding device moves along the guide rod.

[0038] Since the pressure inside the chamber 10 is several atmospheres and the pressure inside the interior 15 is about 1 atmosphere, the inner pipe 40 and the outer pipe 30, which partially protrude into the chamber 10, are pushed toward the interior 15 due to the pressure difference between the chamber 10 and the interior 15, and may retreat toward the interior 15 (buckling).

[0039] Therefore, as shown in FIG. 3, a buckling prevention device 60 is attached to a part of the outer tube 30 to prevent buckling between the outer tube 30 and the inner tube 40.

[0040] Here, the illustrated buckling prevention device 60 has an axial member 61, a fixed end 62 provided at one end of the axial member 61 and fixed to the back surface 12a of the partition wall 12, and a chuck 63 provided at the other end of the axial member 61 and gripping a portion of the outer tube 30.

[0041] The rotation device 50 is driven to rotate the inner tube 40 around its axis in the X3 direction, and the inner tube 40 and the outer tube 30 are moved in the X4 direction toward the chamber 10. This rotation of the inner tube 40 also rotates the high-pressure injection nozzle 47 attached to the tip of the inner tube 40 in the X3 direction.

[0042] At this time, high-pressure water is supplied in the Y1 direction through a hose or the like (not shown) attached to one end 55a of the high-pressure water supply device 55, and the high-pressure water is supplied into the inside of the inner pipe 40 through the high-pressure water supply device 55. The high-pressure water that flows inside the inner pipe 40 in the Y2 direction toward the chamber 10 is then sprayed at high pressure sideways in the Y3 direction from the wall surface of the rotating high-pressure spray nozzle 47.

[0043] In this way, by forcing the high-pressure jet nozzle 47 in a rotating position against the boulder G and jetting high-pressure water laterally from the high-pressure jet nozzle 47, a bottomed hole H is formed inside the boulder G.

[0044] A bottomed hole H of a predetermined length is formed in the boulder G, and while maintaining a portion of the outer tube 30 disposed in the bottomed hole H, the rotation device 50 is removed from the other end 42 of the inner tube 40, as shown in Figure 4, and one end 71 of a separate outer tube 70 (which may be a component of the outer tube 30) is attached to the other end 32 of the outer tube 30.

[0045] The separate outer pipe 70 is provided with a first on-off valve 74 and a first pre-bender 78 at the other end 72 thereof.

[0046] 5, the first opening / closing valve 74 is opened in the X5 direction, the drawing pipe 35 is inserted into a separate outer pipe 70 in the X6 direction, and one end 36 of the drawing pipe 35 is connected to the other end 42 of the inner pipe 40. For example, the other end 42 of the inner pipe 40 is provided with a female thread, and one end 36 of the drawing pipe 35 is provided with a male thread, and the drawing pipe 35 can be rotated to screw the male thread into the female thread, thereby connecting the two.

[0047] As shown in Figure 6, the inner pipe 40 is pulled out from the outer pipe 30 by pulling the extraction pipe 35 towards the inside of the machine 15 and extracting the inner pipe 40 (and the joint pipe 45 and high-pressure injection nozzle 47 at its tip) towards the inside of the machine 15 in the X7 direction via a separate outer pipe 70.

[0048] In addition, by closing the first opening / closing valve 74 in the X8 direction in response to the pulling out of the inner pipe 40 from the outer pipe 30, muddy water and the like in the chamber 10 is prevented from leaking into the interior 15 of the machine via the outer pipe 30.

[0049] As shown in FIG. 7, a static crushing agent 80 is placed in a separate outer tube 70, and a pushing rod 90 is inserted into the separate outer tube 70 in the X9 direction, with one end 91 of the pushing rod being brought into contact with the static crushing agent 80.

[0050] Here, as the static crushing agent 80, Bryster (registered trademark) can be applied, and in the illustrated example, a pack-type static crushing agent is used.

[0051] As shown in FIG. 8, the first opening / closing valve 74 is opened in the X10 direction, the pushing rod 90 is inserted into the outer tube 30 in the X11 direction, and the static crushing agent 80 is pushed into the bottomed hole H with its tip 91.

[0052] As shown in Figure 9, the outer pipe 30 is pulled out from the bottomed hole H in the X12 direction, and the bottomed hole H containing the static crushing agent 80 is filled with solidification material 85. Furthermore, the pushing rod 90 is pulled out from the outer pipe 30 in the X13 direction, and the first opening / closing valve 74 is closed in the X14 direction to prevent muddy water and the like from leaking out.

[0053] As shown in FIG. 10, the outer tube 30 is pulled out from the insertion tube 20 toward the inside of the machine 15 in the direction X15, and the second opening / closing valve 24 is closed in the direction X16 to prevent muddy water or the like from leaking out.

[0054] After the static crushing agent 80 is forced into the bottomed hole H, for example, after a few tens of minutes, the static crushing agent 80 expands as shown in Figure 11, and this expansion pressure causes cracks C to form inside the boulder G from the side of the bottomed hole H, and the boulder G is crushed by the generation of multiple cracks C.

[0055] According to the obstacle breaking device 100 shown in the figure and the obstacle breaking method using this device, even if an obstacle such as a large boulder G is taken into the chamber 10, the obstacle can be quickly broken down into a size that can be taken in by the screw conveyor at the back of the chamber 10. This allows the shield tunneling machine to continue excavating, preventing problems such as the suspension of shield tunnel construction and the extension of the construction period due to the intake of unexpected boulders.

[0056] Furthermore, the obstacle breaking device 100 shown in the figure is not a large-scale device, so it is easy to handle and can be easily installed even in a small internal space, making it applicable to shield tunneling machines with a variety of internal dimensions.

[0057] Furthermore, since the device is configured to insert the outer pipe 30 and inner pipe 40 into the chamber 10 through a small-diameter insertion hole 13, for example, of about 2 to 3 inches, opened in the partition wall 12, obstacles G inside the chamber 10 can be smoothly crushed without causing any damage to the shield tunneling machine.

[0058] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0059] 10: Chamber 12: Bulkhead 12a: Back 13: Insertion hole 15:In the cabin 20: Insertion tube 20a: one end 20b: other end 24: Second opening and closing valve 28: Second Prepender 30:Outer tube 31: One end (tip) 32: Other end 35: Pull-out pipe 36: One end 40: Inner tube 41: One end 42: Other end 45: Joint pipe 47: High-pressure spray nozzle 50: Rotating device 55: High-pressure water supply device 60: Buckling prevention device 61: Shaft member 62: Fixed end 63: Zipper 70: Separate outer tube 71: One end 72: Other end 74: First opening and closing valve 78: First Prepender 80: Static demolition agent 85:Solidification material 90: Push rod 91: One end 100: Obstacle Breaker G: Boulder (obstacle) H: Bottom hole C: Crack

Claims

1. An obstacle breaking device for a shield tunneling machine, the obstacle breaking device comprising: a main body; a cutter head that rotates forward in the excavation direction of the main body; and a partition wall that forms a chamber together with the cutter head inside the main body, the obstacle breaking device breaking up an obstacle that has been taken into the chamber, an outer tube extending into the chamber through a through hole formed in the partition wall; an inner tube inserted into the outer tube and equipped with a high-pressure injection nozzle; a rotating device that rotates the inner tube; a first opening / closing valve attached to the rear of the outer tube to open and close the outer tube; a push rod inserted into the outer tube via the first opening / closing valve, An obstacle crushing device characterized in that the tip of the outer tube is arranged inside a bottomed hole created by drilling the obstacle with high-pressure jet from the high-pressure jet nozzle that protrudes from the end of the outer tube and rotates, the inner tube is pulled out from the outer tube, and the static crushing agent arranged in the outer tube is pushed into the bottomed hole by the pushing rod.

2. 2. The obstacle breaking device according to claim 1, wherein an insertion tube including a second opening / closing valve that can freely open and close the insertion hole is attached to a position on the back surface of the partition corresponding to the insertion hole, and the outer tube and the inner tube inserted into the insertion tube extend into the chamber through the insertion hole with the second opening / closing valve in an open position.

3. A first pre-bender is attached to the rear side of the first opening / closing valve in the outer pipe, A second pre-bender is attached to the rear side of the second opening / closing valve in the insertion tube, The outer tube is inserted into the second prepender while being sealed between the outer tube and the second prepender, and is inserted into the insertion tube and the second opening / closing valve, The obstacle breaking device according to claim 2, characterized in that the pushing rod is inserted into the first prepender while being sealed between the first prepender and the outer tube and the first opening / closing valve.

4. A guide rod is attached to the back surface of the partition or the insertion tube, 4. The obstacle breaking device according to claim 3, wherein a feeding device for feeding out said outer tube is provided so as to be slidable relative to said guide rod.

5. 4. The obstacle breaking device according to claim 3, wherein a buckling prevention device is attached to the back surface of said partition wall or to said insertion tube, and said buckling prevention device is attached to a part of said outer tube.

6. 1. A method for crushing an obstacle taken into a chamber in a shield tunneling machine comprising: a main body; a cutter head that rotates forward in the excavation direction of the main body; and a partition wall that forms a chamber together with the cutter head inside the main body, the method comprising: an outer tube extending into the chamber through an insertion hole formed in the partition wall; an inner tube having a high-pressure jet nozzle at its tip is inserted into the outer tube, a bottomed hole is drilled in the obstacle by high-pressure jet from the rotating high-pressure jet nozzle, and the tip of the outer tube is disposed in the bottomed hole; A method for breaking up obstacles, comprising the steps of: pulling out the inner pipe from the outer pipe; disposing a static crushing agent in the outer pipe; forcing the static crushing agent into the bottomed hole with a pushing rod; and filling the bottomed hole with a solidification material.

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