JP2010190014A - Portal cut-off structure, and method of advancing shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cut-off structure for cutting off underground water flowing out of a clearance between the lower face of an upper stage cutter part of a shield machine and a portal when the upper stage cutter part enters the natural ground from a space or enters the space from the natural ground, and a method of advancing a cut-off structure part. <P>SOLUTION: The cut-off structure 2 of the portal 3 includes a first cut-off means 7 mounted to an earth retaining wall 1 along the peripheral edge of the portal 3, and a second cut-off means 10 provided inside the first cut-off means 7. The first cut-off means 7 is composed of the first cut-off material 8 formed in an annular shape, and a first backup material 9 provided at the space 6 side rather than the first cut-off material 8. The second cut-off means 10 is composed of a second cut-off material 11 with both ends connected to the inner peripheral edge of the first cut-off material 8, and a second backup material 12 provided at the space 6 side rather than the second cut-off material 11. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a water blocking structure for a wellhead and a method for advancing a shield machine when the shield machine starts and reaches.

  With regard to a shield machine that underpasses a road or the like, the present applicant, for example, in Patent Document 1, combines a plurality of main shields that can be moved forward and backward independently from each other in a predetermined arrangement, and independently separates the main shields. The shield machine which excavates and excavates the natural ground is disclosed. When excavating a tunnel with this shield machine, first, the main shield located outside the uppermost stage of the plurality of main shields is dug first, and then the main shield located inside is dug up to the top. Project all the upper main shield, and then dig the lower main shield.

Patent Document 2 discloses a method of propelling a shield machine in which a cutter part is divided into an upper stage and a lower stage in a state where the upper cutter part protrudes in a traveling direction from the lower cutter part. . In this method, the shield machine is installed in a state where the upper part of the lower cutter part is exposed above the ground surface in a state where the shield machine is tilted. The earth retaining wall is excavated, and then the earth is excavated while excavating the earth with the upper and lower cutters.
JP 2006-46061 A JP 2006-207141 A

  However, in the shield machine described in Patent Document 1, since a propulsion device such as a jack and a soil removal device such as a screw conveyor are installed for each of the plurality of main shields, the weight of the front part of the shield machine becomes heavy. Therefore, linear control during propulsion is difficult. Further, when excavating a small earth covering section, there is a problem that the earth covering is affected as soon as a slight deviation occurs in the linear control because the earth covering is shallow.

  Moreover, in the propulsion method of the shield machine described in Patent Document 2, there is almost no cover thickness when the upper cutter portion of the shield machine enters the ground. Therefore, since the weight of the earth covering portion is smaller than the friction force generated between the ground and the shield machine as the shield machine enters the ground, the upper cutter part of the shield machine enters the ground. At that time, there was a problem that the earth covering portion was pulled in the traveling direction of the shield machine and raised, and the ground was damaged.

  On the other hand, the present applicant has arranged the cutter parts that can be driven independently from each other in the upper stage and the lower stage, and the upper and lower stage cutter parts are predetermined in the advancing direction in which the upper stage cutter part is lower than the lower stage cutter part Has been proposed (Japanese Patent Application No. 2008-93221). By using this shield machine, it is possible to solve the problem that, when entering the ground, the earth covering portion is pulled up in the traveling direction of the shield machine and rises and damages the ground.

  When starting this shield machine from a space such as a shaft or light toward the ground, the cutter head of the upper and lower cutters are driven to rotate and the shield machine body is extended by extending the shield jack. First, the shield machine is entered into the natural ground while excavating the natural ground located in the traveling direction with the cutter head of the upper cutter section. When the upper cutter enters the natural ground, the shield machine main body is advanced, and then the shield machine main body enters the natural ground while excavating the natural ground with the cutter head of the lower cutter.

  On the other hand, when this shield machine reaches a space such as a shaft or a light from a natural ground, the cutter head of the upper cutter part and the lower cutter part is driven to rotate, and the shield jack is extended by extending the shield jack. First, the upper cutter is moved into the space. When the upper cutter unit enters the space, the shield machine main body is advanced, and then the shield machine main body enters the space while excavating a natural ground with the cutter head of the lower cutter unit.

  When the shield machine proposed by the present applicant in Japanese Patent Application No. 2008-93221 enters the ground from the space or from the ground to the space, the shield machine body is surrounded by a water-stopping material. Groundwater does not flow into the space through the gap between the machine body and the wellhead. However, when reaching or starting a shield machine in a vertical shaft or space with a thick earth covering, since the upper cutter part protrudes from the lower cutter part, only the upper cutter part moves from the space to the natural ground or the natural ground. When entering the space from the ground, there is a problem that groundwater flows out from the gap between the lower surface of the upper cutter part and the wellhead.

  Therefore, the present invention has been made in view of the above problems, and when the upper cutter portion of the shield machine enters the ground from the space or from the ground to the space, the lower surface of the upper cutter portion. It aims at providing the water stop structure which stops the groundwater which flows out from the crevice between a pit and a wellhead, and the progress method of the water stop structure location.

  In order to achieve the above object, according to the present invention, the cutter parts that can be driven independently from each other are arranged in the upper stage and the lower stage, and the upper and lower cutter parts are in the traveling direction of the upper cutter part than the lower cutter part. It is a water stop structure of a wellhead that is opened in a retaining wall in order to allow a shield machine that is fixedly arranged so as to protrude from the space to the ground or from the ground to the space. Is smaller than the outer shape of the shield machine, the outer dimension is formed larger than the outer shape of the shield machine, the outer periphery of the first water-stop material attached to the earth retaining wall along the peripheral edge of the wellhead The earth retaining wall at a height corresponding to a boundary portion between the upper cutter portion and the lower cutter portion when the shield machine passes through the wellhead inward of the first water stop material. It can be attached to , A band-shaped second water stop material whose both ends are connected to the first water stop material, and provided on the space side of the first water stop material, than the first water stop material. An annular first backup material having high rigidity and flexibility, provided on the space side of the second water stop material, having higher rigidity than the second water stop material, and And a belt-like second backup material having flexibility.

  According to the well stop structure of the wellhead of the present invention, since the first water stop material and the first back-up material are provided, it passes through the gap between the shield machine body and the wellhead opened in the earth retaining wall. The groundwater can be stopped. In addition, since the second water-stopping material and the second backup material are provided, the groundwater passing through the gap between the lower surface of the upper cutter part of the shield machine and the wellhead opening in the retaining wall is stopped. can do. Therefore, groundwater can be prevented from flowing into the space.

  Furthermore, even if the pressure of the groundwater under pressure that has passed through the gap acts on the first and second water-stopping materials, the first backup material and the second backup material are provided. Support the first and second waterstops and bear the pressure. Therefore, the first and second water-stopping materials are not broken by the pressure of the groundwater under pressure, and the water-stopping property can be reliably maintained.

  In the present invention, the second waterstop material and the second backup material may be detachable from the earth retaining wall.

  According to this invention, when the lower cutter part of a shield machine passes, a 2nd water stop material and a 2nd backup material can be removed. Therefore, the second water stop material and the second backup material can be reused.

  The advancing method of the shield machine of the present invention is annular, the inner dimension is smaller than the outer dimension of the shield machine, the outer dimension is larger than the outer dimension of the shield machine, and the outer peripheral part is at the peripheral part of the wellhead. A first waterstop attached to the earth retaining wall along the inner side of the first waterstop, at the boundary between the upper cutter part and the lower cutter part of the shield machine A belt-like second water-stopping material attached to the earth retaining wall at a corresponding height and having both ends connected to the first water-stopping material, and the space more than the first water-stopping material. Provided on the side, higher in rigidity than the first water-stopping material, and provided with an annular first backup material having flexibility, and provided on the space side than the second water-stopping material, The belt-like second bar has higher rigidity than the second water-stopping material and has flexibility. Cutter parts that can be driven independently from each other from the space to the natural ground or from the natural ground to the space are arranged on the upper and lower stages, In the traveling method when the upper and lower cutter portions pass through a shield machine that is fixedly arranged so that the upper cutter portion protrudes in the traveling direction from the lower cutter portion, the upper cutter portion is the first cutter portion. Advancing between one water-stopping material and the second water-stopping material, and stopping the periphery of the upper cutter portion with the first water-stopping material and the second water-stopping material, Supporting them with the first backup material and the second backup material, respectively, when the lower cutter part of the shield machine reaches just before the retaining wall, stop the shield machine, the second Waterproofing material and The second backup material is removed, the entire shield machine is advanced inside the first water stop material, the water around the shield machine is stopped with the first water stop material, and the first It is characterized by supporting it with one backup material.

  According to the proceeding method of the shield machine of the present invention, the first waterstop material, the first backup material, the second waterstop material, and the second backup material are shielded while water is stopped around the upper cutter portion. Since the machine is advanced, groundwater can be prevented from flowing into the space.

  In addition, when the lower cutter enters the natural ground, the ground water flows into the space because the shield machine is advanced while the periphery of the shield machine body is stopped with the first water stop material and the first backup material. Can be prevented.

  Furthermore, even if the pressure of the groundwater under pressure that has passed through the gap between the shield machine and the wellhead acts on the first and second water stop materials, the first backup material and the second backup material are provided. Therefore, these backup materials support the first and second water stop materials and bear the pressure. Therefore, the first and second water-stopping materials are not broken by the pressure of the groundwater under pressure, and the water-stopping property can be reliably maintained.

  And when the lower cutter part of the shield machine reaches just before the earth retaining wall, the second water stop material and the second backup material are removed, so the second water stop material and the second backup material are reused. can do.

  The advancing method of the shield machine of the present invention is annular, the inner dimension is smaller than the outer dimension of the shield machine, the outer dimension is larger than the outer dimension of the shield machine, and the outer peripheral part is at the peripheral part of the wellhead. A first waterstop attached to the earth retaining wall along the inner side of the first waterstop, at the boundary between the upper cutter part and the lower cutter part of the shield machine A belt-like second water-stopping material attached to the earth retaining wall at a corresponding height and having both ends connected to the first water-stopping material, and the space more than the first water-stopping material. Provided on the side, higher in rigidity than the first water-stopping material, and provided with an annular first backup material having flexibility, and provided on the space side than the second water-stopping material, The belt-like second bar has higher rigidity than the second water-stopping material and has flexibility. Cutter parts that can be driven independently from each other from the space to the natural ground or from the natural ground to the space are arranged on the upper and lower stages, In the traveling method when the upper and lower cutter portions pass through a shield machine that is fixedly arranged so that the upper cutter portion protrudes in the traveling direction from the lower cutter portion, the upper cutter portion is the first cutter portion. Advancing between one water-stopping material and the second water-stopping material, and stopping the periphery of the upper cutter portion with the first water-stopping material and the second water-stopping material, Supporting them with the first backup material and the second backup material, respectively, when the lower cutter part of the shield machine reaches just before the retaining wall, rotate the lower cutter part, the lower stage Cuckoo While crushing the second water stop material and the second backup material at the first part, the whole shield machine is advanced inside the first water stop material, and the periphery of the whole shield machine is The water is stopped with one water-stop material, and is supported by the first backup material.

  According to the proceeding method of the shield machine of the present invention, the first waterstop material, the first backup material, the second waterstop material, and the second backup material are shielded while water is stopped around the upper cutter portion. Since the machine is advanced, groundwater can be prevented from flowing into the space.

  In addition, when the lower cutter enters the natural ground, the ground water flows into the space because the shield machine is advanced while the periphery of the shield machine body is stopped with the first water stop material and the first backup material. Can be prevented.

  Furthermore, even if the pressure of the groundwater under pressure that has passed through the gap between the shield machine and the wellhead acts on the first and second water stop materials, the first backup material and the second backup material are provided. Therefore, these backup materials support the first and second water stop materials and bear the pressure. Therefore, the first and second water-stopping materials are not broken by the pressure of the groundwater under pressure, and the water-stopping property can be reliably maintained.

  And when the lower cutter part of the shield machine passes the retaining wall, since the shield machine is advanced with the second water stop material and the second backup material attached, the lower surface of the upper cutter part and The gap between the wellhead can be kept still.

  According to the present invention, when the upper cutter part of the shield machine enters the natural ground from the space or from the natural mountain to the space, it is possible to reliably stop water between the lower surface of the upper cutter part and the wellhead. It becomes.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, the case where the light penetrates the retaining wall from the light and starts into the natural ground and the case where the light reaches the light through the retaining wall from the natural ground are not limited to this. It is also applicable when starting from a shaft to a natural ground or reaching from a natural ground to a shaft. Further, a case will be described in which the upper half of the wellhead is previously opened in the retaining wall, and the lower half of the wellhead is opened (that is, the retaining wall is excavated) as the shield machine advances.

FIG. 1 is a vertical cross-sectional view showing a state in which a water stop structure 2 is installed on an earth retaining wall 1 in which an upper half 3a of a wellhead 3 according to an embodiment of the present invention is opened. 2 and 3 are an enlarged view of a part a and a view in the direction of arrow B in FIG. 1, respectively.
As shown in FIGS. 1 to 3, the water stop structure 2 prevents the groundwater from flowing into the space 6 that is a light from the gap 5 (see FIG. 8) between the wellhead 3 and the shield machine 4. is there.

  The water stop structure 2 includes a first water stop means 7 attached to the earth retaining wall 1 along the peripheral edge of the wellhead 3 composed of the upper half 3a already opened and the lower half 3b to be opened. The second water stop means 10 is provided substantially horizontally inside the water stop means 7, and both ends thereof are connected to the inner periphery of the first water stop means 7.

  The first water stop means 7 is annular and has a first water stop material 8 formed so that the inner dimension is smaller than the outer shape of the shield machine 4 and the outer dimension is larger than the outer dimension of the shield machine 4. The first water-stopping material 8 is provided on the space 6 side, and has a higher rigidity than the first water-stopping material 8 and has a flexible first backup material 9.

  The first water-stopping material 8 has an outer peripheral side edge portion fixed to the earth retaining wall 1 along the peripheral end portion of the wellhead 3. The outer peripheral side edge is in close contact with the earth retaining wall 1 by applying an adhesive. The first water stop material 8 is, for example, a rubber water stop sheet, and can be deformed in the traveling direction following the progress of the shield machine 4.

  The first backup material 9 is attached in an annular shape so as to cover the first water stop material 8. The first backup material 9 is, for example, a steel plate, and can be deformed in the traveling direction following the progress of the shield machine 4, similarly to the first water stop material 8. In addition, since the first backup material 9 has high rigidity, even if the pressure of groundwater that has passed through the gap 5 acts on the first water stop material 8, the first water stop material 8. Support the pressure and bear the pressure.

  The second water stop means 10 is provided at a height position corresponding to a boundary portion between the upper cutter portion 13 and the lower cutter portion 14 when the shield machine 4 (described later) passes through the wellhead 3. The second water stop means 10 has a belt-like second water stop material 11 having both ends connected to the inner peripheral edge of the first water stop material 8 and a lower edge attached to the earth retaining wall 1. The second water-stopping material 11 is provided on the space 6 side, and the second water-stopping material 11 is higher in rigidity than the second water-stopping material 11 and has a flexible second backup material 12.

  The second water stop material 11 is, for example, a rubber water stop sheet, similar to the first water stop material 8, and can be deformed in the traveling direction following the progress of the shield machine 4.

  The second backup material 12 is attached in a band shape so as to cover the second water stop material 11. The second backup material 12 is, for example, a steel plate, similar to the first backup material 9, and can be deformed in the traveling direction following the progress of the shield machine 4. Further, since the second backup material 12 has high rigidity, even if the pressure of groundwater that has passed through the gap 5 acts on the second water stop material 11, the second water stop material 11. Support the pressure and bear the pressure.

  Below, the start method and arrival method of the shield machine 4 are demonstrated. First, the shield machine 4 used in the present invention will be described.

4 and 5 are a front view and a side sectional view of the shield machine 4 according to the present embodiment, respectively.
As shown in FIGS. 4 and 5, the shield machine 4 includes a hood part 15 provided with cutter parts 13 and 14 that can be driven independently from each other, and a shield for advancing the shield machine 4 main body. The girder part 17 is provided with a jack 16 and the like, and the tail part 19 is provided with an erector 18 and the like for assembling the segment 23.

  The upper cutter unit 13 and the lower cutter unit 14 are provided on the front surface of the shield machine 4 main body, and include a cutter head 20 for excavating the natural ground E and a drive source 21 for rotating the cutter head 20. Each cutter unit can be driven independently.

  The upper cutter unit 13 is disposed in the main body of the shield machine 4 so as to protrude by a predetermined length in the traveling direction from the lower cutter unit 14.

  The girder unit 17 is provided with a screw conveyor 22 and the like for discharging the earth and sand excavated by the cutter units 13 and 14.

  Next, a starting method and a reaching method using the shield machine 4 will be described in this order. In the following description, the light used at the start is referred to as a start space 6a. The start space 6a is a start position of the shield machine 4 and is used as a work area for starting the shield machine 4. Since the upper half 3a of the wellhead 3 is opened in advance so that the upper cutter part 13 of the shield machine 4 can enter, the retaining wall 1 is excavated by the lower cutter part 14 to lower the lower half 3b of the wellhead 3 The case where it enters in the natural ground E is demonstrated, forming.

FIG. 6 is a side sectional view showing a state in which the shield machine 4 is installed in the start space 6a.
As shown in FIG. 6, a frame 25 along the inclination angle of the tunnel 24 to be excavated and a reaction force wall 26 for obtaining a reaction force when the shield machine 4 is started are constructed on the bottom of the start space 6a. . Then, the shield machine 4 is installed on the gantry 25.

7-9 is a figure which shows the start method of the shield machine 4. As shown in FIG.
As shown in FIG. 7, the main body of the shield machine 4 is advanced, and the upper cutter portion 13 is inserted between the first water stop means 7 and the second water stop means 10 located in the traveling direction.
And as shown in FIG. 8, when the upper cutter part 13 enters, the 1st water stop material 8, the 2nd water stop material 11, the 1st backup material 9, and the 2nd backup material 12 will be a shield machine. 4, even if groundwater passes through the gap 5 between the upper cutter portion 13 and the earth retaining wall 1 by being deformed in the advancing direction 4 and closely contacting the outer peripheral surface of the upper cutter portion 13. The materials 8 and 11 can prevent the groundwater from flowing into the start space 6a. In addition, even if the pressured groundwater pressure acts on both waterproofing materials 8, 11, each backup material 9, 12 supports each waterproofing material 8, 11 and bears the pressure. I can water.

  In this way, the shield machine 4 is advanced while water is stopped by the both water stop means 7 and 10 around the upper cutter unit 13. And if the lower cutter part 14 arrives just before the earth retaining wall 1, the shield machine 4 will be stopped and the 2nd water stop means 10 will be removed.

  Next, as shown in FIG. 9, the cutter head 20 of the upper cutter unit 13 and the lower cutter unit 14 is driven to rotate, and the shield machine 4 body is advanced so that the earth retaining wall 1 positioned in the traveling direction is The lower half 3b is opened by excavating with the cutter head 20 of the lower cutter section 14.

  When the shield machine 4 enters the first water stop means 7 while excavating the earth retaining wall 1, the first water stop material 8 and the first backup material 9 in contact with the lower cutter portion 14 are moved to the shield machine 4. Even if groundwater passes through the gap 5 between the shield machine 4 body and the earth retaining wall 1 by being deformed in the direction of travel of the shield machine 4 and closely contacting the outer peripheral surface of the shield machine 4 body, the first water stop material 8 can prevent the groundwater from flowing into the start space 6a. Even if the pressure of the groundwater under pressure acts on the first water stop material 8, the first backup material 9 supports the first water stop material 8 and bears the pressure. it can.

  In this way, the shield machine 4 main body enters the ground E while the surroundings of the shield machine 4 main body are stopped by the first water stop means 7.

  Thereafter, a series of operations from the time when the cutter head 20 of the upper cutter unit 13 and the lower cutter unit 14 are rotationally driven to dig a predetermined distance until the segment 23 is constructed is defined as one cycle, and this cycle is performed a plurality of times. By repeating, the entire shield machine 4 is caused to enter the ground E from the start space 6a.

Next, a method for reaching the shield machine 4 will be described.
10-13 is a figure which shows the arrival method of the shield machine 4. FIG. As shown in FIG. 10, in the following description, the light used at the time of arrival is referred to as arrival space 6b. The arrival space 6b is an arrival position of the shield machine 4 and is used as a work area for performing the arrival work of the shield machine 4. Since the upper half 3a of the wellhead 3 is opened in advance so that the upper cutter part 13 of the shield machine 4 can enter, the retaining wall 1 is excavated by the lower cutter part 14 and the lower half 3b of the wellhead 3 A case will be described in which the vehicle enters the arrival space 6b while forming the shape.

  In the natural ground E, the cutter heads 20 of the upper cutter unit 13 and the lower cutter unit 14 are driven to rotate, and the shield machine 4 main body is advanced to the arrival space 6b side. And when the upper half 3a of the wellhead 3 reaches the inside, the upper cutter unit 13 stops the rotation of the cutter head 20 of the upper cutter unit 13.

  Then, as shown in FIG. 11, while the cutter head 20 of the upper cutter unit 13 is stopped, only the cutter head 20 of the lower cutter unit 14 is rotated to excavate the natural ground E, and the first water stop An upper cutter portion 13 is inserted between the means 7 and the second water stop means 10.

  When the upper cutter portion 13 enters, the first waterstop material 8, the second waterstop material 11, the first backup material 9 and the second backup material 12 are deformed in the traveling direction of the shield machine 4, Even if groundwater passes through the gap 5 between the upper cutter portion 13 and the earth retaining wall 1 by being in close contact with the outer peripheral surface of the upper cutter portion 13, the groundwater reaches by the water blocking materials 8 and 11. It can prevent flowing into the space 6b. In addition, even if the pressured groundwater pressure acts on both waterproofing materials 8, 11, each backup material 9, 12 supports each waterproofing material 8, 11 and bears the pressure. I can water.

  In this way, the shield machine 4 is advanced while water is stopped by the both water stop means 7 and 10 around the upper cutter unit 13. And if the lower cutter part 14 arrives just before the earth retaining wall 1, advancing of the shield machine 4 will be stopped.

  Next, as shown in FIG. 12, when the shield machine 4 is stopped, the second water stop means 10 is removed. Then, the cutter head 20 of the lower cutter unit 14 is driven to rotate again, and the shield machine 4 main body is advanced to excavate the earth retaining wall 1 located in the traveling direction with the cutter head 20 of the lower cutter unit 14. The lower half 3b is opened.

  Thereafter, as shown in FIG. 13, when the entire shield machine 4 enters the first water stop means 7, the first water stop material 8 and the first backup material 9 that are in contact with the lower cutter unit 14 are shielded. 4 even if groundwater passes through the gap 5 between the shield machine 4 body and the earth retaining wall 1 by being deformed in the direction of travel 4 and closely contacting the outer peripheral surface of the shield machine 4 body. The material 8 can prevent the groundwater from flowing into the reaching space 6b. Even if the pressure of the groundwater under pressure acts on the first water stop material 8, the first backup material 9 supports the first water stop material 8 and bears the pressure. it can.

  In this way, the shield machine 4 main body is caused to enter the reaching space 6b while water is stopped by the first water stop means 7 around the shield machine 4 main body.

  According to the water stop structure 2 in the present embodiment described above, when the upper cutter portion 13 of the shield machine 4 enters the ground space E from the start space 6a or the reach space 6b from the ground mountain E, the upper stage Between the upper surface and the left and right surfaces of the cutter part 13 and the retaining wall 1 is stopped by the first water stop means 7, and between the lower surface of the upper cutter part 13 and the retaining wall 1 is the second water stop. Since the water is stopped by the means 10, it is possible to prevent the groundwater that has passed through the gap 5 between the upper cutter portion 13 and the earth retaining wall 1 from flowing into the start space 6a and the arrival space 6b.

  Further, when the entire shield machine 4 enters the ground E from the start space 6a or the arrival space 6b from the ground E, the outer shell of the shield 4 is stopped by the first water stop means 7. The groundwater that has passed through the gap 5 between the shield machine 4 main body and the earth retaining wall 1 can be prevented from flowing into the start space 6a or the arrival space 6b.

  Further, the pressure of the groundwater that has passed through the gap 5 between the upper cutter portion 13 and the retaining wall 1 and the gap 5 between the shield machine 4 main body and the retaining wall 1 is the first water-stopping material 8. Even if it acts on the second water-stopping material 11, each backup material 9, 12 supports the water-stopping materials 8, 11 and bears the pressure thereof, so that water can be reliably stopped.

  And the steel sheets of both backup materials 9 and 12 and the water-proof sheets made of rubber of both water-stopping materials 8 and 11 are general materials, and thus are highly available.

  Moreover, when excavating the retaining wall 1 with the lower cutter part 14 of the shield machine 4, the second water-stopping material 11 and the second backup material 12 are removed, so the second water-stopping material 11 and the second water-stopping material 11 The backup material 12 can be reused.

  In addition, in this embodiment, although the case where the upper half 3a of the wellhead 3 was opened previously was demonstrated, it is not limited to this, It is applicable also when it is not opened.

  In addition, in this embodiment, when excavating the earth retaining wall 1 with the lower cutter part 14, the case where the 2nd water stop means 10 was removed was demonstrated, but it is not limited to this, 2nd The water stop means 10 may be excavated together with the retaining wall 1.

It is a vertical sectional view of the water stop structure of a wellhead according to an embodiment of the present invention. It is the a section enlarged view of FIG. It is a B arrow line view of FIG. It is a front view of the shield machine concerning this embodiment. It is a sectional side view of the shield machine concerning this embodiment. It is a sectional side view which shows the state which installed the shield machine in the starting space. It is a figure which shows the start method of a shield machine. It is a figure which shows the start method of a shield machine. It is a figure which shows the start method of a shield machine. It is a figure which shows the arrival method of a shield machine. It is a figure which shows the arrival method of a shield machine. It is a figure which shows the arrival method of a shield machine. It is a figure which shows the arrival method of a shield machine.

DESCRIPTION OF SYMBOLS 1 Earth retaining wall 2 Water stop structure 3 Wellhead 3a Upper half 3b Lower half 4 Shield machine 5 Crevice 6 Space 6a Starting space 6b Arrival space 7 First water stop means 8 First water stop material 9 First backup material 10 2nd water stop means 11 2nd water stop material 12 2nd backup material 13 Upper cutter part 14 Lower cutter part 15 Hood part 16 Shield jack 17 Girder part 18 Elector 19 Tail part 20 Cutter head 21 Drive source 22 Screw conveyor 23 Segment 24 Tunnel 25 Mounting base 26 Reaction wall E Jiyama

Claims (4)

Shields in which cutter parts that can be driven independently from each other are arranged at the upper and lower stages, and the upper and lower cutter parts are fixedly arranged so that the upper cutter part protrudes in the advancing direction from the lower cutter part A water stop structure of a wellhead opened in the earth retaining wall to allow the machine to enter the ground from the space or from the ground to the space,
The outer dimension of the ring is smaller than the outer shape of the shield machine, the outer dimension is larger than the outer shape of the shield machine, and the outer periphery thereof is attached to the earth retaining wall along the peripheral edge of the wellhead. With one water stop material,
On the earth retaining wall at a height position corresponding to a boundary portion between the upper cutter part and the lower cutter part when the shield machine passes through the wellhead inward of the first water stop material. A belt-like second water stop material that is attached to both ends of the first water stop material,
An annular first backup material that is provided on the space side of the first water stop material, has higher rigidity than the first water stop material, and has flexibility,
A belt-like second backup material provided on the space side of the second water-stopping material, having a higher rigidity than the second water-stopping material and having flexibility. Water well structure at the wellhead.   The water stop structure for a wellhead according to claim 1, wherein the second water stop material and the second backup material are detachable from the earth retaining wall. Annular, the inner dimension is smaller than the outer shape of the shield machine, the outer dimension is larger than the outer shape of the shield machine, and the outer periphery is attached to the earth retaining wall along the peripheral edge of the wellhead The earth retaining wall at a height position corresponding to a boundary portion between the upper cutter portion and the lower cutter portion of the shield machine, inside the first waterproof material and the first waterproof material. A belt-like second water-stopping material whose both ends are connected to the first water-stopping material, and provided on the space side of the first water-stopping material. It is higher in rigidity than water material, and has a flexible annular first backup material, and is provided closer to the space than the second water stop material, and is more rigid than the second water stop material. Water-stopping means comprising a belt-like second backup material having high flexibility and flexibility Cutter portions that can be driven independently of each other from the space toward the natural ground or from the natural ground to the space are arranged in the upper and lower stages, and these upper and lower cutter parts are arranged in the upper stage. In the traveling method when the shield machine fixedly arranged so that the cutter part protrudes in the traveling direction than the lower cutter part passes,
The upper cutter portion is advanced between the first water-stopping material and the second water-stopping material, and the first water-stopping material and the second water-stopping material are surrounded around the upper cutter portion. Stop water with water material and support them with the first backup material and the second backup material,
When the lower cutter part of the shield machine reaches just before the retaining wall, stop the shield machine,
Remove the second water stop material and the second backup material,
The entire shield machine is advanced inside the first water stop material, and the periphery of the entire shield machine is stopped by the first water stop material and supported by the first backup material. A method of advancing a shield machine characterized by the above. Annular, the inner dimension is smaller than the outer shape of the shield machine, the outer dimension is larger than the outer shape of the shield machine, and the outer periphery is attached to the earth retaining wall along the peripheral edge of the wellhead The earth retaining wall at a height position corresponding to a boundary portion between the upper cutter portion and the lower cutter portion of the shield machine, inside the first waterproof material and the first waterproof material. A belt-like second water-stopping material whose both ends are connected to the first water-stopping material, and provided on the space side of the first water-stopping material. It is higher in rigidity than water material, and has a flexible annular first backup material, and is provided closer to the space than the second water stop material, and is more rigid than the second water stop material. Water-stopping means comprising a belt-like second backup material having high flexibility and flexibility Cutter portions that can be driven independently of each other from the space toward the natural ground or from the natural ground to the space are arranged in the upper and lower stages, and these upper and lower cutter parts are arranged in the upper stage. In the traveling method when the shield machine fixedly arranged so that the cutter part protrudes in the traveling direction than the lower cutter part passes,
The upper cutter portion is advanced between the first water-stopping material and the second water-stopping material, and the first water-stopping material and the second water-stopping material are surrounded around the upper cutter portion. Stop water with water material and support them with the first backup material and the second backup material,
When the lower cutter part of the shield machine reaches just before the retaining wall, rotate the lower cutter part,
While crushing the second water stop material and the second backup material at the lower cutter part, the entire shield machine is advanced inside the first water stop material, and the entire periphery of the shield machine The method for advancing a shield machine is characterized in that water is stopped by the first water-stopping material and supported by the first backup material.

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