Filler supply and discharge system

Abstract

To provide a filler supply / discharge system for a jacking method that can suppress cost increases even when equipped with multiple jacking devices. [Solution] A filler supply and discharge system 6 used for multiple propulsion devices spaced apart in the tunnel axial direction, comprising a conduit connecting a first space whose volume changes according to the amount of extension and contraction of a first jack provided on a first propulsion device, and a second space whose volume changes according to the amount of extension and contraction of a second jack provided on a second propulsion device linked to the first propulsion device, and when the first jack is retracted, the filler filled in the first space is supplied to the second space through the conduit.

Description

[Technical Field]

[0001] The present invention relates to a filler supply and discharge system. [Background technology]

[0002] At the junctions of road tunnels and the station areas of railway tunnels, it is sometimes necessary to form underground spaces with a larger cross-section than normal main line tunnels.Patent Document 1 discloses a method for constructing a large cross-section underground space, in which a radial space is formed from an existing tunnel in a direction perpendicular to the tunnel axis, and then a circular tunnel formed by a jacking method is connected to the side wall of this radial space to form a cylindrical outer shell that surrounds the existing tunnel, and the portion surrounded by the cylindrical outer shell is excavated to form the large cross-section underground space.

[0003] The jacking method is a construction method for constructing a tunnel by sequentially pushing multiple boxes into the ground using a jack installed inside the starting shaft. In addition, with the jacking method, a lubricant (filler) is filled into the gaps around the tunneling machine and the jacking box to reduce friction between the jacking box and the ground, stabilize the ground around the jacking box, prevent ground collapse and consolidation, and prevent subsidence or uplift above ground.

[0004] In the jacking method, when the thrust of the main jack cannot be sufficiently transmitted to the tunnel tip, such as when the tunnel has sharp curves or is long, it is necessary to install a jacking device (such as a central jacking device) equipped with a jacking jack at an appropriate location in the tunnel axial direction (including inside the tunnel boring machine). One known jacking device is described in Patent Document 2, for example. This jacking device comprises a double-structured inner tube that surrounds the jack, and an outer tube that surrounds the inner tube. The inner tube is expandable and contractable in accordance with the expansion and contraction of the jack. A filler material is filled in the space between the inner tube and the outer tube and the space between the outer tube and the natural ground, and the natural ground is held in place by the pressure of this filler material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7498146 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-032794 Summary of the Invention [Problem to be solved by the invention]

[0006] The volume of the space between the inner tube and the natural ground changes depending on the extension / retraction of the jack. The cross-sectional area of ​​this space is large, and the pressure of the filler material changes as the jack extends or retracts, which may affect the natural ground. Therefore, in tunnel construction with a propulsion unit in the middle of the tunnel, it is preferable to provide a filler supply / discharge system that can supply filler material to the space when the jack extends and discharge filler material from the space when the jack retracts. When propulsion units are installed before and after a row of boxes consisting of multiple connected boxes, the row of boxes is pushed forward by retracting the jack of the front propulsion unit while extending the jack of the rear propulsion unit. However, providing independent filler supply / discharge systems for multiple propulsion units increases equipment costs in proportion to the number of propulsion units.

[0007] An object of the present invention is to provide a filler supply and discharge system for a jacking method that can suppress cost increases even when multiple jacking devices are provided. [Means for solving the problem]

[0008] To solve the above problem, the present invention provides a filler supply / discharge system for use with a plurality of propulsion devices spaced apart in the tunnel axial direction, the system comprising a conduit that connects a first space whose volume changes in response to the amount of extension / retraction of a first jack provided on a first propulsion device with a second space whose volume changes in response to the amount of extension / retraction of a second jack provided on a second propulsion device that is linked to the first propulsion device; The pipeline includes a portion of a main pipeline extending from a supply source of filler material into the tunnel, a first pipeline extending from the portion of the main pipeline to the first space, a second pipeline extending from the portion of the main pipeline to the second space, a first on-off valve capable of opening and closing the first pipeline, and a second on-off valve capable of opening and closing the second pipeline, and when the first on-off valve and the second on-off valve are in an open state, When the first jack is retracted, the filler filled in the first space Due to pressure difference The gas is supplied into the second space through the pipeline.

[0009] With this filler supply and discharge system, when multiple propulsion devices are used, filler can be supplied to the necessary locations using a common filler supply and discharge system, eliminating the need to install multiple filler supply systems and enabling reductions in equipment costs. [Effects of the Invention]

[0011] According to the filler supply / discharge system of the present invention, even when it is provided for a plurality of propulsion devices, it is possible to suppress an increase in costs. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram showing a filler supply / discharge system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view showing a propulsion box. [Figure 3] FIG. 2(a) is a perspective view showing the tunneling machine, and FIG. 2(b) is a perspective view showing the tunneling machine when the machine jack is extended. [Figure 4] 1A and 1B are diagrams showing a tunneling machine, in which (a) is a longitudinal section and (b) is a cross-sectional view. [Figure 5] FIG. 1A is a perspective view showing the inner push device, and FIG. 1B is a perspective view showing the inner push device when the inner push jack is extended. [Figure 6] 1A and 1B are diagrams showing an inner push device, in which (a) is a cross-sectional view and (b) is a longitudinal section. [Figure 7] FIG. 1 is a schematic diagram showing an overview of a primary injection facility. [Figure 8] This is a flowchart showing the steps of a tunnel construction method, where (a) is the first stage, (b) is the second stage, and (c) is the third stage. [Figure 9] FIG. 10 is an explanatory diagram showing the operation of the filler supply and discharge system during the tunneling machine advancing process. [Figure 10] FIG. 10 is an explanatory diagram showing the operation of the filler supply / discharge system in the inner pushing / propelling process. [Figure 11] FIG. 10 is an explanatory diagram showing the operation of the filler supply / discharge system in the second inner pushing / propelling process. [Figure 12]FIG. 10 is an explanatory diagram showing the operation of the filler supply / discharge system in the end pushing / propelling process. DETAILED DESCRIPTION OF THE INVENTION

[0013] In this embodiment, a case where a tunnel is constructed using the jacking method will be described. The jacking method involves constructing a tunnel by sequentially pushing multiple jacking boxes 2 into the ground using a main jack 31 (main jacking device 3) installed in the shaft T. Figure 1 shows an overview of the propulsion system 1 of this embodiment. As shown in Figure 1, the propulsion system 1 comprises a main jacking device 3, a tunneling machine 4, a center jacking device 5, and a filler supply / discharge system 6. In this embodiment, the tunnel is long and the thrust of the main jack 31 is not sufficiently transmitted to the tip of the tunnel, so multiple propulsion devices (tunneling machine 4, center jacking device 5) are installed at appropriate locations in the tunnel axial direction.

[0014] The propulsion box 2 is pushed into the ground by the main pushing device 3. Figure 2 shows the propulsion box 2 of this embodiment. As shown in Figure 2, the propulsion box 2 has a steel shell that is rectangular in cross section. The propulsion box 2 of this embodiment has main girders 21 formed in a frame shape by combining steel materials, vertical ribs (not shown) interposed between adjacent main girders 21 in the axial direction, an outer shell 22 that covers the outer surfaces of the main girders 21, and support columns 23 erected within the propulsion box 2. The configuration of the propulsion box 2 is not limited; for example, the support columns 23 may be provided as needed. The cross-sectional shape of the propulsion box 2 is also not limited; for example, it may be circular.

[0015] As shown in FIG. 1 , the main pushing device 3 is provided in the vertical shaft T and applies a propulsive force to the propulsion box body 2. The main pushing device 3 is provided on a stand (not shown) formed in the vertical shaft T and has a plurality of main pushing jacks 31. The main pushing jacks 31 secure a reaction force from the stand and apply a propulsive force to the propulsion box body 2.

[0016] The tunneling machine 4 is shown in Figures 3 and 4. As shown in Figure 3(a), the tunneling machine 4 has the same cross-sectional shape (rectangular) as the propulsion box 2, and includes a front body 42 and a rear body 43. The tunneling machine 4 of this embodiment is longer at the bottom than at the top, in accordance with the curved tunnel alignment with an upward gradient. As shown in Figure 4(a), the front body 42 is equipped with a cutter head 44 on its front side. The rear body 43 is equipped with multiple machine jacks 41 (propulsion jacks) and a rear slab 45 to which the rear ends of the machine jacks 41 are attached and which abuts against the propulsion box 2. The tunneling machine 4 cuts the natural ground with the cutter head 44, and the machine jacks 41 receive reaction force from the propulsion box 2 at the rear, which imparts propulsive force to the tunneling machine 4, thereby controlling its direction as it moves forward. In other words, the tunneling machine 4 of this embodiment also functions as a propulsion device.

[0017] As shown in FIGS. 4(a) and (b), the rear body 43 includes a cylindrical inner tube 46 that houses the machine jack 41, and an outer tube 47 that covers the inner tube 46. The outer tube 47 has a cylindrical portion 48 that is provided around the outer surface of the inner tube 46, and a square tube portion 49 that is shaped to match the outer shape of the tunneling machine 4. The square tube portion 49 surrounds the three cylindrical portions 48, and a space into which filler material enters during construction is formed between the cylindrical portion 48 (inner tube 46) and the square tube portion 49 of the rear body 43. As shown in FIGS. 3(a) and (b), the rear body 43 expands and contracts as the outer tube 47 slides along the outer surface of the inner tube 46 as the machine jack 41 expands and contracts. When the machine jack 41 extends, the inner tube 46 is exposed at the rear of the tunneling machine 4, expanding the space into which filler material enters during construction.

[0018] The central pushing device 5 is disposed between the main pushing device 3 and the tunneling machine 4 and applies a thrust to the tunneling machine 4 with respect to the propulsion box 2 (see FIG. 1). The central pushing device 5 is shown in FIGS. 5 and 6. As shown in FIG. 5(a), the central pushing device 5 has the same cross-sectional shape (rectangular) as the propulsion box 2. In this embodiment, the central pushing device 5 is longer at the bottom than at the top, in accordance with the curved tunnel alignment with an upward gradient. As shown in FIG. 6(a), the central pushing device 5 comprises three propulsion units 50, 50, 50 arranged side by side. The left and right propulsion units 50 are each provided with a plurality of central pushing jacks 51, 51, ... arranged in a ring shape, and the central propulsion unit 50 is provided with a plurality of central pushing jacks 51, 51, ... arranged horizontally in two rows, one above the other. The rear ends of the multiple central pushing jacks 51, 51, ... are attached to a rear plate 52 that abuts against the rear propulsion box 2.

[0019] As shown in FIGS. 6(a) and 6(b), the inner pushing device 5 includes an inner cylinder 53, 53, 53 surrounding the multiple inner pushing jacks 51, 51, ... of each propulsion unit 50, and an outer cylinder 54 surrounding the inner cylinder 53. The outer cylinder 54 has a cylindrical portion 55 provided around the outer surface of the inner cylinder 53 and a square cylindrical portion 56 shaped according to the outer shape of the inner pushing device 5. The square cylindrical portion 56 surrounds the three cylindrical portions 55, and a space into which filler material enters during construction is formed between the cylindrical portion 55 (inner cylinder 53) and the square cylindrical portion 56. As shown in FIGS. 5(a) and 5(b), the inner pushing device 5 expands and contracts as the outer cylinder 54 slides along the outer surface of the inner cylinder 53 as the inner pushing jack 51 expands and contracts. When the inner pushing jack 51 expands, the inner cylinder 53 is exposed at the rear of the inner pushing device 5, expanding the space into which filler material enters during construction.

[0020] The filler supply and discharge system 6 supplies filler (lubricant) to the gap between the natural ground and the tunnel (the propulsion box 2, the tunnel excavator 4, the thrust device 5, etc.). Injecting lubricant around the tunnel reduces the frictional resistance that occurs when the propulsion box 2 is advanced into the ground, thereby reducing the required thrust and preventing loosening of the natural ground. In this embodiment, filler is injected from the front body of the tunnel excavator 4 to the outside of the tunnel to stabilize the natural ground (see FIG. 7). Secondary injection (see FIG. 1) is performed to replenish the filler injected in the primary injection due to deterioration or penetration into the natural ground. Secondary injection is performed from the propulsion box 2 disposed behind the tunnel excavator 4 to the outer periphery. In addition, a supply and discharge facility 61 is added to the conventional secondary injection facility to supply or discharge secondary injection material to areas where the volume of the propulsion device (the tunnel excavator 4, the thrust device 5) changes significantly.

[0021] For the primary injection, a primary injection equipment 65 is used. Figure 7 shows the primary injection equipment 65. As shown in Figure 7, the primary injection equipment 65 includes a primary injection tank 651 that stores the filler material, a primary injection pump 652 that pumps the filler material, a primary injection main pipe 653 that extends from the primary injection tank 651 into the tunneling machine 4, and a primary injection branch pipe 654 that extends from the primary injection main pipe 653 to the grout hole in the front body.

[0022] As shown in Figure 1, the filler supply and discharge system 6 of this embodiment includes a supply and discharge facility 61 that supplies and discharges the lubricant (filler) for the propulsion device, and a secondary injection facility 62 that aims to replenish the lubricant. The supply and discharge facility 61 supplies filler at a set injection rate and injection pressure as soon as excavation begins. The supply and discharge facility 61 includes a piping system that runs from a supply and discharge tank 611 outside the tunnel to the propulsion device. The secondary injection facility 62 supplies filler when it is determined that the thrust force has increased and the friction-reducing effect of the filler injected by primary injection has decreased, and includes a piping system that runs from a secondary injection tank 621 to the propulsion box 2.

[0023] The supply and discharge equipment 61 includes a supply and discharge tank 611 for storing the filler material, a supply and discharge injection pump 612 for pumping the filler material, a main supply and discharge pipe 613 extending from the supply and discharge tank 611 into the tunnel shaft, and a supply and discharge branch pipe 614 leading from the main supply and discharge pipe 613 to the propulsion jacks (machine jack 41, center push jack 51). The spaces around the machine jack 41 of the tunneling machine 4 and the space around the center push jack 51 of the center push device 5 can communicate with each other via the supply and discharge branch pipe 614 and the main supply and discharge pipe 613.

[0024] The secondary injection equipment 62 comprises a secondary injection tank 621 for storing the filler material, a secondary injection pump 622 for pumping the filler material, a secondary injection main pipeline 623 extending from the secondary injection tank 621 into the tunnel shaft, and a secondary injection branch pipeline 624 extending from the secondary injection main pipeline 623 to the grout hole in the propulsion box body 2.

[0025] The supply / discharge branch pipe 614 and the secondary injection branch pipe 624 are each provided with an on-off valve 63 and a pressure gauge 64 . The supply and discharge injection pump 612, secondary injection pump 622 and on-off valve 63 are configured to be controllable by a control means not shown, and the filler material can be supplied and discharged according to the progress of the tunnel (such as the advancement and retreat of the propulsion jack) and the measurement value of the pressure gauge 64, etc.

[0026] A tunnel construction method using the propulsion system of this embodiment will now be described. Figure 8 shows the steps of the tunnel construction method. In the departure stage (first stage) when the tunneling machine 4 departs from the vertical shaft 13, only the tunneling machine 4 and the end-pushing device 3 are the basic components. As shown in Figure 8(a), the tunnel construction method in the first stage comprises a tunneling machine advancing step S11, an end-pushing advancing step S12, and a propulsion box installation step S13.

[0027] In the tunneling machine advancing step S11, the machine jack 41 of the tunneling machine 4 is extended to move the tunneling machine 4 forward. Once the tunneling machine 4 has been advanced to a predetermined position, the propulsion box 2 is pushed into the ground by the propulsion device 3 (propulsion advancing step S12). In the propulsion advancing step S12, the machine jack 41 of the tunneling machine 4 is retracted while the propulsion jack 31 is extended to move the propulsion box 2 arranged behind the tunneling machine 4 forward. Once the propulsion jack 31 is extended a predetermined length and the propulsion box 2 has been advanced a predetermined length, a new propulsion box 2 is arranged (propulsion box installation step S13). In the propulsion box installation step S13, the propulsion jack 31 is retracted to form a gap between the propulsion jack 31 and the propulsion box 2 arranged at the rear, and a new propulsion box 2 is installed in the gap. Once a new propulsion box 2 has been installed, a base jack 31 is placed against that propulsion box 2. Thereafter, by repeating the tunneling machine advancing step S11, the base jack advancing step S12, and the propulsion box installation step S13, the tunneling machine 4 is advanced and a predetermined number of propulsion boxes 2 are pushed into the ground.

[0028] When the tunnel construction has progressed a predetermined length and the first stage is completed, the center pushing device 5 is supplied from the vertical shaft T, and construction is carried out with the center pushing device 5 (first center pushing device) interposed between the tunneling machine 4 and the main pushing device 3 (second stage). As shown in Figure 8(b), the second stage involves the center pushing device installation process S21, the tunneling machine advancing process S22, the center pushing advancing process S23, the main pushing advancing process S24, and the advancing box installation process S25.

[0029] In the center pusher device installation step S21, the center pusher device 5 is installed in the gap formed between the retracted main pusher jack 31 and the rearmost propulsion box body 2. Once the center pusher device 5 is installed, the machine jack 41 is extended to move the excavator 4 forward while the excavator 4 cuts the natural ground (excavator advancing step S22). Once the excavator 4 has been advanced to a predetermined position, the machine jack 41 is retracted while the center pusher jack 51 of the center pusher device 5 is extended to move the propulsion box 2 installed between the center pusher device 5 and the excavator 4 forward (center pusher advancing step S23).

[0030] After the central jack 51 has been extended to a predetermined length, the central jack 51 is retracted while the main jack 31 is extended, and the propulsion box 2 disposed between the central device 5 and the main device 3 is advanced (main jack advancing step S24). After the main jack 31 has been extended to a predetermined length and the propulsion box 2 has been advanced to a predetermined position, the main jack 31 is retracted. A new propulsion box 2 is disposed in the space formed between the main jack 31 and the propulsion box 2 disposed at the rear end by retracting the main jack 31 (propulsion box disposing step 25). After the new propulsion box 2 has been disposed, the main jack 31 is placed against the propulsion box 2. Subsequently, by repeating the tunneling machine advancing step S22 to the propulsion box disposing step 25, the tunneling machine 4 is advanced to a predetermined position and a predetermined number of propulsion boxes 2 are pushed into the ground.

[0031] As the jacking construction progresses further, a separate jacking device 5 (second jacking device) is supplied from the shaft T, and construction is carried out using multiple jacking devices 5 (third stage). As shown in Figure 8(c), in the third stage, the jacking device installation process S31, the tunneling machine jacking process S32, the first jacking device jacking process S33, the second jacking device jacking process S34, the main jacking device jacking process S35, and the jacking box installation process S36 are carried out.

[0032] In the center pusher installation process S31, a separate center pusher (second center pusher) 5 is interposed between the existing center pusher (first center pusher) 5 and the main pusher 30. Once the new center pusher 5 is supplied, the tunneling machine advancing process S32 by the tunneling machine 4, the first center pusher advancing process S33 by the first center pusher, the second center pusher advancing process S34 by the second center pusher, and the main pusher advancing process S35 by the main pusher 3 are carried out to advance the propulsion box 2, and then the propulsion box installation process S36 is carried out. By repeating the tunneling machine advancing process S32 to the propulsion box installation process S36 in the same way, the tunneling machine 4 is advanced to a predetermined position while pushing a predetermined number of propulsion boxes 2 into the ground. Thereafter, by adding an inner pushing device 5 as necessary and repeating the tunneling machine advancing step S32 to the advancing box arrangement step S36, a tunnel of a predetermined length is constructed.

[0033] Next, the operation of the filler supply / discharge system in each process will be described. In the tunneling machine advancing steps S11, S22, and S32, construction is performed with the on-off valve 63 of the first injection branch pipeline, which communicates with the space around the machine jack 41, open (see Figure 9). In addition, the on-off valve 63 on the discharge side of the supply / discharge injection pump 612 is opened. This supplies filler material to the space around the machine jack 41 (see Figure 3(b)), maintaining pressure on the natural ground. As with backfill injection in the shield tunneling method, two injection control methods are set. One is to set upper and lower pressure limit values ​​and inject while managing the pressure, and the other is to set an injection rate according to the tunneling stroke and inject while managing the injection rate. Generally, both methods are set, and the pump inverter increases or decreases the injection rate to achieve the set injection rate through injection rate management, and the pump is started according to the lower pressure limit and stopped according to the upper pressure limit.

[0034] In the inner jack advancing step S23 (first inner jack advancing step S33), first, an on-off valve (first on-off valve) 63 of a first supply / discharge branch pipe 614 (first pipe) that communicates with the space (first space) around the machine jack 41 (first jack) and an on-off valve (second on-off valve) 63 of a second supply / discharge branch pipe 614 (second pipe) that communicates with the space (second space) around the inner jack 51 (second jack) in the inner jack 5 (second propulsion device) that is closest to the tunneling machine 4 (first propulsion device) are opened (see FIG. 10). This brings the extension / contraction section (first space) of the machine jack 41 and the extension / contraction section (second space) of the inner jack 51 into communication. Thereafter, when the machine jack 41 starts to retract and the inner jack 51 starts to extend, the volume of the first space decreases, increasing the pressure of the filler material, while the volume of the second space increases, decreasing the pressure of the filler material. This pressure difference causes the filler to move from the first space to the second space, making it easier to maintain the initial pressure value.

[0035] Here, in tunnel construction, upper and lower limit values ​​for the pressure of the supply and discharge branch pipe 614 are set in advance. When the pressure in the first space and the second space reaches the lower limit, the filler material is replenished. Replenishment is performed by opening the on-off valve 63 near the supply and discharge injection pump 612 and operating the supply and discharge injection pump 612. Furthermore, when the pressure in the first space and the second space reaches the upper limit, the pressure is adjusted by withdrawing the filler material. Removal is performed by opening the on-off valve 63 near the supply and discharge tank 611 and discharging the filler material into the supply and discharge tank 611. When pushing by the central push jack 51 is completed, all on-off valves 63 are closed.

[0036] In the second internal jacking propulsion step S34, first, the on-off valve 63 of the first supply / discharge branch pipeline 614 (first pipeline) that communicates with the space (first space) around the internal jack 51 (first jack) in the internal jacking device 5 (first propulsion device) on the face side, and the on-off valve 63 of the second supply / discharge branch pipeline 614 (second pipeline) that communicates with the space (second space) around the internal jack 51 (second jack) in the internal jacking device 5 on the wellhead side (the internal jacking device 5 closest to the internal jacking device 5 on the face side: the second propulsion device) are opened (see FIG. 11). This places the first space and the second space in communication. After that, when the internal jack 51 of the internal jacking device 5 on the face side begins to retract and the internal jack 51 of the internal jacking device 5 on the wellhead side begins to extend, the volume of the first space decreases, increasing the pressure of the filler material, while the volume of the second space increases, decreasing the pressure of the filler material. This pressure difference causes the filler to move from the first space to the second space, and the pressure returns to the original value. When the pushing by the inner push jack 51 is completed, all the on-off valves 63 are closed.

[0037] In the base pushing steps S12, S24, and S35, first, the on-off valve 63 of the supply / discharge branch pipe 614 that communicates with the propulsion jack closest to the base jack 31 (machine jack 41 or center jack 51: center jack 51 in FIG. 12) is opened (FIG. 12). This connects the space around the propulsion jack to the supply / discharge tank 611 via the main supply / discharge pipe 613. When the base jack 31 begins to extend and propulsion by the base jack 31 begins, the volume of the space around the center jack 51 decreases, and the pressure of the filler material increases. When this pressure exceeds a threshold value, the on-off valve 63 near the supply / discharge tank 611 is opened, and the pressure is adjusted by drawing out the filler material via the main supply / discharge pipe 613. When propulsion by the base jack 31 is completed, all on-off valves 63 are closed.

[0038] According to the construction method of this embodiment, even when multiple propulsion devices are used, the filler is supplied and discharged by a common filler supply and discharge system 6, so there is no need to install multiple filler supply and discharge systems, which makes it possible to reduce equipment costs. Also, it is easier to manage than when multiple filler supply and discharge systems are installed.

[0039] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-described components can be modified as appropriate within the scope of the invention. The shape of the tunnel constructed using the propulsion system is not limited, and may be, for example, a long-distance tunnel, a tunnel with sharp curves, a circular tunnel, or the like.

[0040] The number of thrust devices (internal thrust devices 5) used in tunnel construction is not limited, and may be determined appropriately in relation to the thrust length, required thrust force, etc. It is desirable to automatically control the propulsion jacks and on-off valves involved in tunnel construction via control means, but they may also be controlled manually. In the above embodiment, the length of the lower part of the tunnel tunneling machine and the thrust device is longer than that of the upper part, but the shapes of the tunnel tunneling machine and the thrust device are not limited. For example, in the case of a linear tunnel, the length of the tunnel tunneling machine and the thrust device in the axial direction may be constant in all directions. [Explanation of symbols]

[0041] 1 Propulsion System 2 Propulsion box 21 Main girder 22 Outer shell 23 Pillar 3 Main push device 31 Push jack 4 excavator 41 Machine jack (propulsion jack) 42 Front body 43 Rear fuselage 44 Cutter Head 45 later edition 46 Inner cylinder 47 Outer cylinder 48 Cylindrical part 49 Square tube part 5. Center push device 50 Propulsion Unit 51 Center jack 52 later edition 53 Inner cylinder 54 outer cylinder 55 Cylindrical part 56 Square tube part 6 Filler supply and discharge system 61 Supply and drainage equipment 611 Supply and discharge tank (supply source) 612 Injection pump for supply and discharge 613 Main supply / discharge pipeline 614 Supply and exhaust branch pipes 62 Secondary injection equipment 621 Secondary Injection Tank (Source) 622 Secondary Infusion Pump 623 Secondary injection main line 624 Secondary injection branch line 63 On-off valve 64 Pressure gauge T-shaped pit

Claims

[Claim 1] A filler supply and discharge system used for a plurality of propulsion devices spaced apart in the tunnel axial direction, comprising: a conduit that connects a first space whose volume changes according to the extension and contraction amount of a first jack provided in the first propulsion device with a second space whose volume changes according to the extension and contraction amount of a second jack provided in a second propulsion device that is linked to the first propulsion device; The conduit comprises a portion of a main conduit extending from a source of fill material into the tunnel; a first pipeline extending from a portion of the main pipeline to the first space; a second pipeline extending from a portion of the main pipeline to the second space; a first on-off valve capable of opening and closing the first pipeline; a second on-off valve capable of opening and closing the second pipeline, A filler supply and discharge system characterized in that, when the first opening / closing valve and the second opening / closing valve are opened and the first jack is retracted, the filler filled in the first space is supplied into the second space through the pipeline due to a pressure difference.

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