JP4370277B2 - Shielding machine reaching construction method and reaching part structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a reaching construction method and a reaching portion structure of a shield machine, and in particular, a reaching machine method of a shield machine when a shield machine that reaches a reaching shaft is entered into a tunnel of the reaching shaft, and the reaching method. The present invention relates to the structure of the reach of the shield machine used.

  The shield tunnel construction method is arranged continuously between the starting shaft and the reaching shaft by performing the excavation work with the shield machine while obtaining the reaction force from the segments that are sequentially installed from the starting shaft to the reaching shaft. This is a method of forming a tunnel with a large number of segments. Various shield machines such as a mud pressure shield machine and a muddy shield machine are known as shield machines for carrying out the shield tunneling method.

  In the shield tunnel construction method, when the shield machine is made to reach the arrival shaft, the shield machine is made to enter the tunnel by passing through a wellhead that is formed in a retaining wall constructed by a continuous wall or the like around the arrival shaft. However, for example, by improving the ground around the wellhead, earth and sand and water will flow into the well from the gap between the wellhead with the opening formed and the outer surface of the shield machine that penetrates the ground. There is a device to avoid it. In addition, a method is adopted in which the earth retaining wall in the part where the wellhead is formed is cut using, for example, poorly-mixed concrete, and the retaining wall is directly cut by the shield machine to enter the reach shaft There is also a case. Furthermore, in the ground where the tunnel depth is deep or the groundwater level is high, the interior of the reach shaft is filled with water, and the ground pressure around the entrance is stabilized by this water pressure, and the shield machine is entered into the reach shaft. In some cases, a construction method is adopted. Furthermore, supporting the peripheral edge of the wellhead, attaching a cylinder covering the wellhead from the inside of the well, sealing the end face on the inside of the well of this cylinder and filling the inside with pressurized air, pressurized water, etc. There is a case where a construction method is adopted in which the shield machine is entered into the reaching shaft while stabilizing the ground around the wellhead (see, for example, Patent Document 1).

  Also, in any of the above methods for reaching the shield machine, after the shield machine is passed through the wellhead, the gap is sealed between the outer peripheral surface of the shield machine and the inner peripheral surface of the wellhead. It is common that the entrance seal member to be supported is attached to, for example, a wellhead ring provided along the peripheral edge of the wellhead.

On the other hand, the entrance seal member attached to the periphery of the wellhead is preferably a rubber-type pressure tube that can be inflated and deformed by injecting and filling a pressurized fluid such as pressurized air or pressurized water, a rubber plate type packing, etc. When the shield machine goes through the wellhead while cutting the improved ground or retaining wall, the cutting blade comes into contact with the entrance seal member, or the excavated earth and sand are on the entrance seal member. By depositing or the like, damage or breakage is likely to occur, and earth and sand or glass may be caught inside the entrance seal member and may not be sufficiently adhered to the outer peripheral surface of the shield machine. For this reason, an entrance device provided at the reaching portion of the shield machine has been developed so that damage and breakage of the entrance seal member can be effectively avoided and reliable sealing performance can be obtained. (For example, see Patent Document 2).
JP 2003-74292 A JP 2004-92233 A

  According to the entrance device described in Patent Document 1, a cylindrical entrance chamber closed on the inner side of the shaft is supported and attached to the inner wall surface of the reaching shaft, and at a position close to the entrance in the entrance chamber. A ring-shaped entrance seal member that can be switched between an expanded seal operating state and a reduced standby state, and a protective cylinder disposed inside the entrance seal member are provided. And when the shield excavator passes through the wellhead with the pressure fluid filled in the entrance chamber, the tip of the shield excavator is brought into contact with the inner surface of the tip of the protective cylinder to advance together with the shield excavator. Thus, the protective cylinder body is slid to a position outside the region of the entrance seal member to expose the entrance seal member, and the exposed entrance seal member is expanded to elastically contact the outer peripheral surface of the shield excavator. .

  According to the entrance device of Patent Document 1, after passing through the wellhead, the shield excavator moves forward in the entrance chamber in a state where the tip portion is covered by the protective cylinder, so that the entrance seal member is removed from the protective cylinder. Until it comes off, it becomes possible to effectively avoid contact with the cutting blade of the entrance seal member, excavation earth and sand, etc. by the protective cylinder, but on the other hand, it is sized to accommodate almost the entire shield excavator. It is necessary to have a double cylinder structure consisting of a cylindrical entrance chamber that encloses pressure fluid inside and a protective cylinder installed inside it, and its structure and installation work are complicated As a result, the construction cost increases.

  The present invention has been made paying attention to such a conventional problem, and it is effective not to use a double cylinder structure but to effectively use an entrance seal member attached to a wellhead ring portion with a simple and inexpensive configuration. In a shield tunneling machine reaching construction method capable of allowing the shield tunneling machine to reach the reaching shaft while protecting it, and stably sealing the inside of the wellhead ring portion by the entrance seal member, and the reaching construction method It aims at providing the reach | attainment part structure of the shield machine used.

  The present invention is a method for reaching a shield machine when a shield machine that reaches a reaching shaft is made to enter the tunnel of the reaching shaft, and is formed along a peripheral edge of the well that the shield machine reaches. A wellhead ring portion to which an entrance seal member for sealing a gap between the outer peripheral surface of the tunnel and a tunnel is attached is provided so as to protrude from the inner surface of the earth retaining wall to the inside of the reach shaft, and inside the wellhead ring portion, A cylindrical body having a size covering the outer peripheral surface of the tip portion of the shield machine including the rotary cutter is installed with the entrance seal member in close contact with the outer peripheral surface of the cylindrical body, and the end surface on the inner side of the cylindrical body Is closed with a lid member, and the lid member is supported so that it can be pressed from the inside of the mine by an expansion / contraction jack, and the front is penetrated until the tip contacts the lid member. Advance the shield machine and further advance the shield machine together with the cylinder while contracting the telescopic jack, and place the entrance seal member in the outer body or segment of the shield machine behind the cylinder. The above object is achieved by providing a reaching method for a shield machine in which a gap inside the wellhead ring portion is sealed by the entrance seal member by being in close contact with the outer peripheral surface of the shield.

  Moreover, according to the reaching construction method of the shield machine of the present invention, before the shield machine reaches the reaching vertical shaft, the earth retaining wall of the portion of the wellhead is suspended and the suspended portion is applied. After the cylinder body is attached to the wellhead side of the entrance seal member, the tubular body is drawn to the inside of the wellhead, and the tubular body is installed inside the wellhead ring portion. Is preferred.

  Furthermore, according to the reaching construction method of the shield machine of the present invention, the shield machine is further advanced together with the cylinder while the telescopic jack is contracted, and the entrance seal member is moved behind the cylinder. When the outer body of the shield machine or the outer peripheral surface of the segment is brought into intimate contact, after the cylindrical body to which the telescopic jack and the lid member are attached is removed, the shield machine is further pushed out into the shaft of the reaching shaft. Can be.

  Further, the present invention is a shield tunneling machine structure used in the shield tunneling machine reaching construction method, wherein the inner surface of the earth retaining wall along the peripheral edge of the shaft of the reaching shaft that the shield tunneling machine reaches A wellhead ring portion that protrudes inwardly from the vertical shaft, an entrance seal member that is attached to the wellhead ring portion, and is installed on the inside of the wellhead ring portion so that the entrance seal member is in close contact with the outer peripheral surface, and is rotated. A cylindrical body having a size that covers the outer peripheral surface of the tip portion of the shield machine including the cutter, a lid member that closes an end surface on the inner side of the cylindrical body, and the lid member that can be pressed from the inner side. The above object is achieved by providing a reach structure of a shield machine composed of an extension jack.

  According to the reach structure of the shield machine of the present invention, the entrance seal member is arranged in an annular shape along the inner peripheral surface of the wellhead ring portion, and pressurized fluid is injected into the inside to expand and deform. It is preferable that the pressure tube comprises a pressure seal tube and a water stop seal plate disposed in an annular shape adjacent to the well opening side of the pressure tube.

  Moreover, according to the reach | attainment part structure of the shield machine of this invention, it is preferable that the front-end | tip protrusion recessed part which accommodates the fishtail part of the rotary cutter of the said shield machine is provided in the center part of the said cover member.

  Furthermore, according to the reach structure of the shield machine of the present invention, the tip of the shield machine is provided with an auxiliary bit projecting radially outward from the outer peripheral surface thereof, and the cylindrical body is It is preferable that a cross-sectional shape having a peripheral surface protruding recess is provided at a position corresponding to the auxiliary bit.

  According to the reaching construction method of the shield machine or the reaching part structure of the shield machine of the present invention, the entrance seal member attached to the wellhead ring part can be provided with a simple and inexpensive configuration without using a double cylinder structure. While effectively protecting the shield machine, it is possible to reach the reaching shaft, and the entrance seal member can stably seal the inside of the wellhead ring portion.

  A shield tunneling machine 11 according to a preferred embodiment of the present invention is a shield tunneling machine 11 that tunnels toward a tunnel shaft 12 as shown in FIG. 1 in a shield tunneling method using, for example, a mud pressure shield tunneling machine. After reaching the reach shaft 12 through the wellhead 14, the shield machine 11 is preferably pulled out into the shaft of the reach shaft 12 and inverted, and then, for example, an upstream line formed in advance using the reach shaft 12 as the start shaft In addition to this shield tunnel, it was adopted when forming a new shield tunnel for the down line.

  In addition, the reaching construction method of the present embodiment is formed by penetrating the wellhead opening 14 formed in the retaining wall 13 constructed by a continuous wall by, for example, the SMW (cement mixing wall) method surrounding the periphery of the reaching shaft 12, When the shield machine 11 is made to enter the shaft of the reaching shaft 12, the sand and water are prevented from flowing into the mine from the gap between the inner peripheral surface of the wellhead 14 and the outer peripheral surface of the shield machine 11, The entrance seal member 15 that prevents the inflow of earth and sand from such gaps is prevented from being damaged or broken by contact with the cutting blade of the shield machine 11 or the earth and sand, and its sealing function. It is adopted in order to be able to exhibit the effect effectively.

  And the reach | attainment construction method of the shield machine of this embodiment is a construction method at the time of making the shield machine 11 which reaches | attains the arrival shaft 12 enter the inside of the arrival shaft 12, Comprising: The wellhead which the shield machine 11 reaches | attains A wellhead ring portion 16 to which an entrance seal member 15 for sealing a gap between the wellhead 14 and the outer peripheral surface of the tunnel is attached is projected from the inner side surface of the earth retaining wall 13 to the inside of the reaching shaft 12 along the peripheral edge portion 14. The cylindrical body 17 having a size covering the outer peripheral surface of the tip portion of the shield machine 11 including the rotary cutter 11 a is provided inside the wellhead ring portion 16, and the entrance seal member 15 is provided on the outer peripheral surface of the cylindrical body 17. Are installed in close contact with each other, and the end surface on the inner side of the cylindrical body 17 is closed with a lid member 18, and the lid member 18 is pushed from the inner side by the telescopic jack 19. To be able to and support the state. From this state, the shield machine 11 is advanced until it penetrates the wellhead 14 and the tip abuts against the lid member 18 (see FIG. 10), and the shield machine 11 is further advanced together with the cylindrical body 17 while the telescopic jack 19 is contracted. Then, the entrance seal member 15 is brought into close contact with the outer body (skin plate) 11b of the shield machine or the outer peripheral surface of the segment 20 behind the tubular body 17 (see FIG. 11). The gap inside the ring portion 16 is sealed.

  According to the present embodiment, before the shield machine 11 reaches the reaching shaft 12, as shown in FIGS. 2 and 3, the retaining wall along the peripheral edge of the portion where the wellhead 14 is formed. The wellhead ring portion 16 is attached to the inner surface of the well 13, and the retaining wall 13 in the inner region of the attached wellhead ring portion 16 is picked up and mirror-cut to form the wellhead 14. Prior to mirror cutting, the ground where the wellhead 12 is formed and the outer peripheral ground around it are formed by improving the ground by a CJG (column jet) method or the like, thereby forming an improved ground 21. deep. Further, in the stage shown in FIG. 3, the outer surface portion of the retaining wall 13 is left with a thickness of, for example, about 30 mm without being mirror cut over the entire thickness of the retaining wall 13 at the wellhead 12 portion. To do. By these, when performing mirror cutting of the wellhead 14 portion by, for example, manual work, more sufficient safety is ensured.

  Here, as shown in an enlarged view in FIG. 14, the wellhead ring portion 16 is attached to the inner surface of the earth retaining wall 13 with one flange portion 22 a and attached in a ring shape along the peripheral portion of the wellhead 12. It consists of a steel member 22 having an I-shaped cross section and a concrete portion 23 that is cast and formed in a ring shape having a horizontally long and substantially rectangular cross section so as to cover the outside of the steel member 22. On the inner side surface of the rib portion 22b of the steel member 22, a pressurizing tube 24 is arranged in an annular shape along the inner peripheral surface of the wellhead ring portion 16. And the entrance seal member 15 which consists of the water stop sealing board 25 arrange | positioned adjacent to the wellhead side of this pressurization tube 24 in an annular | circular shape is attached via the fixing metal fittings 26 with a volt | bolt etc. In addition, the concrete portion 23 has one end opened to be openable and closable at an end surface on the inner side of the concrete portion 23, and the other end is opened to the rib portion 22 b of the steel member 22 on the wellhead side of the entrance seal member 15. One end of the digested soil injection pipe 27 and the cutout portion 23 a of the concrete portion 23 are openable to the other flange portion 22 c of the steel member 22, and the other end communicates with the inside of the pressure tube 24. The pressurized air injection pipes 28 opened to the rib portions 22b of the steel member 22 are respectively embedded and installed at predetermined positions in the circumferential direction.

  The entrance seal member 15 composed of the pressure tube 24 and the water stop seal plate 25 wraps the pressure tube 24 from the inside with a water seal plate 25 that can be deformed flexibly, and the inner surface of the tube 17 The pressurizing tube 24 and the water stop seal plate 25 are brought into close contact with the outer peripheral surface, the outer peripheral surface of the shield machine 11 or the outer peripheral surface of the segment 20 while being elastically deformed. The gap between the peripheral surface and the inner peripheral surface of the wellhead ring portion 16 is effectively sealed. Further, when closely contacting each outer peripheral surface, the pressurized tube 24 is further expanded and deformed by supplying pressurized air to the inside of the pressurized tube 24 via the pressurized air injection tube 28, thereby further strengthening the entrance seal member 15. The sealing property can be secured.

  When the wellhead ring portion 16 is installed along the peripheral edge of the wellhead 12 and the retaining wall 13 of the wellhead 12 portion is removed while leaving the outer surface portion, for example, as shown in FIG. 4 and FIG. The operation of arranging the cylindrical body 17 inside is performed. In other words, a split piece member obtained by dividing the cylindrical body 17 into a plurality of pieces in the circumferential direction is preferably arranged so as to cover the portion of the wellhead 12 that has been cut off, and is assembled in a ring shape on the wellhead 14 side of the entrance seal member 15. A body 17 is formed (see FIG. 4). After that, for example, the cylindrical body 17 assembled by using the chain block 29 is drawn toward the inner side of the reaching shaft 12, thereby installing the cylindrical body 17 inside the wellhead ring portion 16 (see FIG. 5). As a result, the entrance seal member 15 is disposed in close contact with the outer peripheral surface of the cylindrical body 17 while interposing the water-stop seal plate 25 bent inwardly between the outer peripheral surface of the cylindrical body 17 and the pressure tube 24. Will be.

  Here, according to the present embodiment, as shown in FIG. 15, the cylindrical body 17 arranged inside the wellhead ring portion 16 has an inner diameter that is, for example, 200 mm larger than the outer diameter of the outer body 11 b of the shield machine 11. It is formed in a substantially circular ring shape that is increased to some extent. Further, the cylindrical body 17 is formed with a length of about 1200 mm, for example, so that the outer peripheral surface of the rotary cutter 11a and the gap between the rotary cutter 11a and the outer body 11b at the tip of the shield machine 11 are formed. The outer periphery and the outer peripheral surface of the front end portion of the outer body 11b provided with the auxiliary bit 30 (see FIG. 1) protruding outward in the radial direction are provided with a length capable of continuously covering the outer periphery.

  The auxiliary bit 30 has, for example, a pipe-shaped convex portion 31 (see FIG. 1) for arranging a backfill injection pipe extending in the axial direction of the tunnel on the outer peripheral surface of the rear portion of the shield machine 11. In order to cut the portion corresponding to the belt-like convex portion 31 for piping into the outside of the shield machine 11 and excavate it in advance, the outer end of the outer body 11b is radially outward. It is a cutting blade provided protruding in the direction. In the case where such an auxiliary bit 11c is provided so as to protrude from the outer peripheral surface of the shield machine 11, the cylindrical body 17 is preferably provided at a predetermined position on the upper portion corresponding to the auxiliary bit 30, and the peripheral surface protruding concave portion 17a. (See FIG. 15).

  When the cylindrical body 17 is installed inside the wellhead ring portion 16, as shown in FIG. 6, the end surface on the inner side of the cylindrical body 17 is closed by the lid member 18, and the lid member 18 is pressed from the inner side of the tunnel by the extension jack 20. A supported state is assumed. Here, the lid member 18 has a front shape that substantially matches the cross-sectional shape of the cylindrical body 17. For example, after the flange alignment with the distal end flange portion 17 b (see FIG. 15) of the cylindrical body 17, By joining using a bolt etc., it attaches to the cylinder 17 integrally in the state which sealed the end surface inside the pit of the cylinder 17. In addition, the center portion of the lid member 18 is provided with a tip protruding concave portion 18a having a circular cross section protruding inward of the well. When the shield machine 11 that has reached the end vertical shaft 12 moves forward until the rotary cutter 11b at the tip contacts the inner surface of the lid member 18 as will be described later, the fishtail portion of the rotary cutter 11b 11c is accommodated (see FIG. 10). The tip of the tip protruding recess 18a is hermetically sealed by a sealing lid 32 that can be opened and closed. It should be noted that the sealing lid 32 is appropriately opened so that, for example, an operator can enter the cylindrical body 17 and the wellhead 14 from the tip protruding recess 18a, and the sealing lid 32 is closed, The inside of the cylindrical body 17 and the wellhead 14 can be used as a sealed space.

  On the front surface of the lid member 18 installed so as to cover the end surface of the cylindrical body 17, a plurality of press assisting members 33 are appropriately interposed around the front surface except for the tip protruding concave portions 18 a, and a plurality of well-balanced arrangements are provided. The telescopic jack 19 is attached in a state where the lid member 18 is supported so as to be pressed. The telescopic jack 19 is composed of, for example, a hydraulic jack, and is supported by a support base (not shown) that is simply and firmly assembled by a steel material such as a temporary H-shaped steel, and reaches, for example, a portion facing the wellhead 14. The lid member 18 can be stably supported with a considerable pressing force while obtaining a support reaction force from the earth retaining wall 13 of the shaft 12.

  Further, according to the present embodiment, pressurized air is applied to the pressurizing tube 24 of the entrance seal member 15 attached to the inner side of the wellhead ring portion 16 and in close contact with the outer peripheral surface of the cylindrical body 17 via the pressurized air injection pipe 28. By supplying, the pressurizing tube 24 is inflated and deformed to generate an urging force inward in the radial direction, and is brought into close contact with the outer peripheral surface of the cylindrical body 17 in a stronger and stable state.

  By these, the arrival structure 10 of the shield machine for performing the ultimate construction method of this embodiment is from the inner surface of the earth retaining wall 13 along the peripheral edge of the wellhead 14 of the arrival shaft 12 to which the shield machine 11 reaches. A wellhead ring portion 16 that protrudes inward of the reaching shaft 12, an entrance seal member 15 that is attached to the wellhead ring portion 16, and an entrance seal member 15 that is installed inside the wellhead ring portion 16 while closely contacting the outer seal surface. The cylindrical body 17 having a size that covers the outer peripheral surface of the tip portion of the shield machine 11 including the rotary cutter 11b, the lid member 18 that closes the end surface on the inner side of the cylindrical body 17, and the lid member 18 from the inner side. It is comprised by the expansion-contraction jack 19 supported so that a press is possible, and it will be installed in the reaching shaft 12.

  Moreover, according to this embodiment, as shown in FIG.7 and FIG.8, in the space inside the cylinder 17 and the wellhead 14 sealed by the lid member 18 of the installed reaching structure 10, preferably, By filling the curable fluidized soil 34, the shield machine 11 passes through the wellhead 14 until the shield machine 11 reaches the reaching shaft 12 (see FIG. 9), and the cover member 18 is contacted. Until contact is made (see FIG. 10), the improved ground 21 facing the wellhead 14 is pressed down so as to be in a stable state without collapsing. That is, for example, the sealing lid 32 that seals the tip protruding recess 18a of the lid member 18 is opened, and an operator enters the inside of the cylindrical body 17, and the outer surface of the retaining wall 13 at the part of the wellhead 14 that is mirror-cut is left. The portions are sequentially lifted from below to above (see FIG. 7). Preferably, when suspended at a predetermined height divided into a plurality of parts in the vertical direction, the fluidized soil injection pipe 27 disposed at the upper end of the wellhead ring portion 16 after the worker goes out of the cylinder 17 and retreats each time. The curable fluidized soil 34 is injected to a predetermined height from the fluidized soil injection pipe 27 disposed at the lower portion of the wellhead ring portion 16 while venting the inside. When the injected curable fluidized soil 34 has hardened, the worker enters the interior again, and after the outer surface portion above the retaining wall 13 of the wellhead 12 portion is picked up, the worker evacuates and the curable fluidization treatment is performed. The soil 34 is injected and filled into the cylinder 17 and the wellhead 14 to be cured (see FIG. 8). This makes it possible to hold the improved ground 21 facing the wellhead 14 in a stable state by the hardened curable fluidized soil 34.

  Here, as the curable fluidized soil 34, for example, a mixed soil that has been fluidized by mixing poor mortar can be used. Such a curable fluidized soil 34 has sufficient fluidity to be injected through the fluidized soil injection pipe 27, and quickly hardens after injection, and is compressed enough for a person to ride. It has strength and cutting strength that can be easily cut by the rotary cutter 11b of the shield machine 11. In order to hold down the improved ground 21 facing the wellhead 14 in a stable state, a pressurized fluid such as pressurized air or pressurized water is injected and filled inside the cylinder 17 sealed by the lid member 18. However, the improved ground 21 facing the wellhead 14 in a more solid and stable state by filling the cylinder 17 with the curable fluidized soil 34 and curing it. It becomes possible to hold down.

  When the reaching structure 10 is installed as described above, as shown in FIG. 9, the shield machine 11 is advanced toward the reaching shaft 12, and the tip portion thereof penetrates the wellhead 14, so that the shield machine 11 is It reaches the reaching shaft 12. That is, according to the present embodiment, the shield machine 11 cuts the improved ground 21 with the rotary cutter 11a at the tip, and advances while obtaining the digging reaction force from the segment 20 assembled backward by extending the shield jack 11d. 10 (see FIG. 10), and further through the wellhead 14 while cutting the curable fluidized soil 34 filled inside the wellhead 14 and the cylindrical body 17, as shown in FIG. 10, of the rotary cutter 11a It advances until the tip abuts against the inner surface of the lid member 18.

  When the tip of the shield machine 11 comes into contact with the inner surface of the lid member 18, the rotation of the rotary cutter 11 a is stopped, and as shown in FIG. 11, the shield jack is contracted while the telescopic jack 19 disposed in front of the lid member 18 is contracted. 11 d is extended, and the shield machine 11 is further advanced together with the cylinder 17 until the entrance seal member 15 is disengaged rearward of the outer peripheral surface of the cylinder 17. As a result, the entrance seal member 15 that has been in close contact with the outer peripheral surface of the cylindrical body 17 is in close contact with the outer peripheral surface of the outer body 11b of the shield digging 11 while expanding its cross-sectional shape inward by a radially inward biasing force. And the clearance gap between the inner shell 11b inside the wellhead ring part 16 is sealed. Further, the pressurized tube 24 is further inflated and deformed by supplying pressurized air to the pressurized tube 24 of the entrance seal member 15 that is in close contact with the outer peripheral surface of the outer body 11b through the pressurized air injection tube 28. While generating an inward biasing force, the outer peripheral surface of the outer body 11b is brought into close contact with the outer body 11b in a stronger and stable state.

  According to the present embodiment, when the entrance seal member 15 is brought into close contact with the outer peripheral surface of the outer body 11b of the shield machine 11 behind the cylinder 17, as shown in FIG. 12, the telescopic jack 19 and the lid member 18 are used. After the cylindrical body 17 attached with is removed, the shield machine 11 is further advanced so as to be pushed into the shaft of the reaching shaft 12. Here, after the entrance seal member 15 is brought into close contact with the outer peripheral surface of the outer body 11b behind the cylinder 17, the entrance seal member 15 comes into contact with the cutting blade of the shield machine 11 or excavated earth and sand. Since there is no damage or breakage, the shield machine 11 can be pulled out into the shaft of the reaching shaft 12 in the same manner as in the conventional reaching method.

  That is, while obtaining a reaction force from the segment 20 assembled inside the outer body 11b of the shield machine 11, the shield jack 11d is extended to push the shield machine 11 into the mine, as shown in FIG. The excavator 11 is pulled out into the shaft of the reaching shaft 12 with the segment 20 left behind. Further, the entrance seal member 15 which has moved forward by the shield machine 11 and has come off the rear side of the outer body 11b has the sectional shape of the segment 20 installed rearward while enlarging its cross-sectional shape inward by a radially inward biasing force. It closely adheres to the outer peripheral surface and seals the gap between the inner side segment 20 of the wellhead ring portion 16. Further, the pressurized tube 24 is further inflated and deformed by supplying pressurized air to the pressurized tube 24 of the entrance seal member 15 that is in close contact with the outer peripheral surface of the segment 20 via the pressurized air injection tube 28, so that the radial direction While generating an inward biasing force, the segment 20 is brought into close contact with the outer peripheral surface of the segment 20 in a more stable and stable state. Further, the back filling material 35 is filled in the rear portion of the entrance seal member 15 that is in close contact with the outer peripheral surface of the segment 20.

  In addition, according to this embodiment, after the shield machine 11 pulled out in the shaft of the reaching shaft 12 is inverted as described above, the upstream shaft preferably formed in advance is preferably used as the starting shaft 12. It will be reused to form a new shield tunnel along with the shield tunnel. Further, when the shield machine 11 is pushed out into the shaft of the reaching shaft 12, the entrance seal member 15 attached to the wellhead ring portion 16 is a strip-shaped convex portion for piping extending on the outer peripheral surface of the rear portion of the shield machine 11. 31. However, it is possible to absorb such displacement of the stepped portion by the elasticity of the pressurizing tube 24 and the water stop seal plate 25 and to maintain the strong sealing performance by the entrance seal member 15. become.

  And according to the reaching construction method of the present embodiment as described above, the entrance seal member 15 attached to the wellhead ring portion 16 is effectively protected by a simple and inexpensive configuration without using a double cylinder structure. While the shield machine 11 can reach the reaching shaft 12, the entrance seal member 15 can seal the inner side of the wellhead ring portion 16 in a stable state. That is, according to the present embodiment, the wellhead ring portion 16 to which the entrance seal member 15 is attached, the cylindrical body 17 that covers the outer peripheral surface of the tip portion of the shield machine 10, and the end surface on the inner side of the cylindrical body 17 are closed. The reaching structure 10 constituted by the lid member 18 and the expansion / contraction jack 19 that supports the lid member 18 so as to be pressed from the inside of the mine is installed, and the shield machine 11 is made to pass through the wellhead 14 and contact the lid member 18. The shield engraving machine 11 is further advanced together with the cylindrical body 17 while the telescopic jack 19 is contracted, and the entrance seal member 15 is brought into close contact with the outer peripheral surface of the outer casing 11b of the shield engraving machine 11 behind the cylindrical body 17. As a result, the gap inside the wellhead ring portion 16 is sealed by the entrance seal member 15. It is possible to simply and easily installed by the steel, while supporting the telescopic jack 19 by firmly assemblable support cradle, without by double tubular structure, it is possible to easily and inexpensively construction.

  Further, until the rotary cutter 11a of the shield machine 11 passes through the wellhead ring portion 16, the entrance seal member 15 is covered with the cylindrical body 17, and the contact with the cutting blade, excavated earth and sand, cutting glass and the like is cut off. Therefore, the sealing performance is impaired when the entrance seal member 15 is damaged or broken, or earth and sand or glass is caught inside the entrance seal member and cannot sufficiently adhere to the outer peripheral surface of the shield machine 10. Can be effectively avoided.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the present invention is not limited to a mud pressure shield excavator, but can be employed to reach other reaching shield shafts such as a mud shield excavator. In addition, the shield machine that reached the reach shaft is not limited to the one that reverses and tunnels again, but can be removed from the reach shaft, or newly directed toward the opposite side of the reach shaft Tunnel excavation may be performed. Further, the entrance seal member attached to the wellhead ring portion does not necessarily need to be composed of a pressure tube that is inflated and deformed by injection of pressurized fluid and a water-stop seal plate. A wire for tightening is attached to the inner edge of the ring-shaped rubber packing, and a rubber packing is attached to the outer peripheral surface of a shield machine, etc. by tightening this wire. Various well-known entrance seal members, such as those that can be brought into close contact with each other to exert a sealing function, can also be used. Furthermore, it is not always necessary to provide a tip protruding recess at the center portion of the lid member or a peripheral surface protruding recess on the outer peripheral surface of the cylinder.

It is a schematic sectional drawing explaining the reaching construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is a schematic sectional drawing explaining 1 process of the ultimate construction method of the shield machine which concerns on preferable one Embodiment of this invention. It is an expanded sectional view of a well mouth ring part and an entrance seal member. It is a front view explaining the positional relationship of the outer body and cylinder of a shield machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shielding machine reaching structure 11 Shielding machine 11a Rotating cutter 11b Outer body 11c Fishtail part 11d Shield jack 12 Reaching shaft 13 Earth retaining wall 14 Wellhead 15 Entrance seal member 15a Shield tunnel tip 16 Wellhead ring part 17 Cylindrical body 18 Lid member 19 Telescopic jack 20 Segment 21 Improved ground 22 Steel member 23 Concrete part 24 Pressure tube 25 Water seal plate 26 Fixing metal fitting 27 Fluidized soil injection pipe 28 Pneumatic injection pipe 29 Chain block 30 Auxiliary bit 31 Band shape for piping Convex part 32 Sealing lid 33 Press auxiliary member 34 Hardening fluidized soil 35 Backfilling material

Claims (7)

A shield tunneling machine reaching construction method when the shield tunneling machine reaching the reaching shaft is entered into the tunnel of the reaching shaft,
A wellhead ring portion to which an entrance seal member for sealing a gap between the wellhead and the outer peripheral surface of the tunnel is attached along the peripheral edge portion of the wellhead reached by the shield machine from the inner side surface of the earth retaining wall to the inside of the reach shaft. A cylindrical body of a size that covers the outer peripheral surface of the tip portion of the shield machine including a rotary cutter inside the wellhead ring portion, and the entrance seal member on the outer peripheral surface of the cylindrical body The end face on the inner side of the tubular body is closed with a lid member, and the lid member is supported so that it can be pressed from the inner side by an extension jack,
The shield machine was advanced until it penetrated the wellhead and the tip abutted against the lid member, and the shield machine was further advanced together with the cylinder while contracting the telescopic jack, so that the shield machine was detached from the cylinder. Arrangement of the shield machine to seal the gap inside the wellhead ring portion by the entrance seal member by bringing the entrance seal member into close contact with the outer peripheral surface of the outer body or segment of the shield machine. Method.   Prior to the shield machine reaching the reach shaft, the earth retaining wall of the wellhead portion is removed, and the shield wall is disposed so as to cover the removed portion, and the entrance seal member is closer to the wellhead side than the entrance seal member. 2. The shield tunneling machine reaching construction method according to claim 1, wherein after the cylinder is attached, the cylinder is pulled to the inside of the well and the cylinder is installed inside the wellhead ring portion.   When the shield machine is further advanced together with the cylinder while contracting the telescopic jack, and the entrance seal member is brought into close contact with the outer surface of the shield machine or the segment behind the cylinder The reaching construction method for a shield machine according to claim 1 or 2, wherein the shield machine is further pushed into the shaft of the reaching shaft after the tubular body to which the telescopic jack and the lid member are attached is removed. The reaching structure of the shield machine used in the method for reaching the shield machine according to any one of claims 1 to 3,
A wellhead ring portion provided so as to project inward from the inner surface of the earth retaining wall along the peripheral edge portion of the wellhead reaching the shield tunnel, and an entrance seal member attached to the wellhead ring portion A cylinder having a size covering the outer peripheral surface of the front end portion of the shield machine including the rotary cutter, the cylinder being installed on the inner side of the wellhead ring portion while bringing the entrance seal member into close contact with the outer peripheral surface; A reach structure of a shield machine that includes a lid member that closes an end surface on the inner side of a mine and an expansion jack that supports the lid member so as to be pressed from the inner side of the mine.   The entrance seal member is arranged in an annular shape along the inner peripheral surface of the wellhead ring portion, and is adjacent to the wellhead side of the pressurizing tube, which is inflated and deformed by injecting a pressurized fluid therein. The reach structure of the shield machine according to claim 4, further comprising a water stop seal plate arranged in an annular shape.   The reaching portion structure of the shield machine according to claim 4 or 5, wherein a tip projecting recess for receiving a fishtail portion of a rotary cutter of the shield machine is provided at a central portion of the lid member. The front end portion of the shield machine is provided with an auxiliary bit protruding radially outward from the outer peripheral surface thereof, and the cylinder has a cross section having a peripheral surface protruding recess at a position corresponding to the auxiliary bit. The reaching part structure of the shield machine according to any one of claims 4 to 6, wherein the shield machine has a shape.

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