JP4741941B2 - Underground wall, wall member for shield method, and shield method - Google Patents

Description

  The present invention relates to an underground wall used for a shield method, a wall member for a shield method used for the wall, and a shield method performed using these.

Conventionally, a shield method using a shield excavator has been used to form a tunnel or the like.
In this shield method, a start shaft is first formed at a starting point, and is vertically digged from the ground to a depth at which a tunnel is formed. Then, the shield excavator is lowered, and the tunnel is dug horizontally using the shield excavator. Further, an arrival shaft similar to the start shaft is provided at the end point of the tunnel or at a predetermined intermediate point, and a shield excavator is allowed to arrive at the shaft.

Underground shafts such as starting shafts are formed with underground walls so that groundwater eruption and ground collapse do not occur. This underground wall receives the pressure applied to the inside, but it must be able to excavate when the shield excavator starts and reaches.
Also, when a branch is formed in the tunnel, the shield excavator must be excavated to dig from the inside to the outside of the tunnel wall or from the outside to the inside.
And the technique which forms such an underground wall is disclosed by patent document 1.
JP-A-2005-23737

Such an underground wall may be formed of reinforced concrete, which is concrete reinforced with reinforcing bars. And since the start reach | attainment area | region which is an area | region through which a shield excavator passes cannot be reinforced using a reinforcing bar etc., it is reinforced using the material which has high intensity | strength and can be excavated in this area | region.
As a high-strength material that can be excavated, a fiber reinforced resin described in Patent Document 1 can be used.

  Since the start arrival area is an area through which the shield excavator passes, the area reaches a certain extent. A long member is used in such a region, and both ends of the long member are connected and fixed to a reinforcing bar or the like. Therefore, this long member is reinforced in an installed state like a beam.

  In the case of the underground wall as described above, it is desirable to prevent displacement between the concrete portion and the long member. For this reason, there are methods of making the surface of the elongated member uneven, or forming a stepped portion. However, with the method of making the surface uneven, the processing tends to be complicated, and when a step is provided, the thickness changes partially, and the stress that the material receives due to bending and shearing changes, resulting in a portion where large stress is applied There was a risk that the strength of the steel would decrease.

  In addition, when a fiber reinforced resin or the like is used, the bending effect can be further increased because the reinforcing effect is particularly greater in the fiber orientation direction than in the other directions. Therefore, if a plate-like material having a uniform thickness is used, the thickness of the portion where the shearing force is small is matched with the portion where the large shearing force is applied, and the whole becomes large.

  Then, this invention makes it a subject to provide the wall member for shield methods which can be excavated with a shield excavator and can reinforce an underground wall.

  In order to achieve the above-mentioned object, the invention according to claim 1 has a cutting enable member having a curved bar shape having a circumferential direction, a thickness direction, and a width direction, and the circumferential direction of the cutting enable member is curved. A thick portion is formed at both ends in the circumferential direction, a thin portion thinner than the thick portion is formed in the thickness direction between the thick portions, and a concave portion is formed inside the curve by the thin portion. The cutting enabling member is arranged in the cutting enabling region of the underground wall so that the recess is on the inside, and the shield machine penetrates the cutting enabling region of the underground wall to start or reach It is a wall member for shield methods characterized by being able to do.

  According to the first aspect of the present invention, the thick wall portion and the thin wall portion are provided, the cut-off enabling member having the recess is formed, and the cut-off enable member is disposed in the underground wall so that the recess is inside. Therefore, it can be excavated by a shield excavator and the underground wall can be reinforced.

  Invention of Claim 2 is formed using the laminated board laminated | stacked on the thickness direction, and the thick part was formed by increasing the number of the laminated boards laminated | stacked with respect to a thin part. It is a thing, It is a wall member for shield methods of Claim 1 characterized by the above-mentioned.

  According to invention of Claim 2, it forms using the laminated board laminated | stacked on the thickness direction, and a thick part forms by increasing the number of the laminated boards laminated | stacked with respect to a thin part. Therefore, the thick portion and the thin portion can be easily formed.

  The invention according to claim 3 is the shield plate construction method according to claim 2, wherein the laminated plate is made of a polyurethane foam resin molded body reinforced with long fibers, and the fibers are oriented in the circumferential direction. It is a wall member.

  According to the third aspect of the present invention, a polyurethane foam resin molded body reinforced with long fibers is used for the laminated plate, and the fibers are oriented in the circumferential direction. It is possible to penetrate the underground wall.

  In the invention according to claim 4, the region other than the cutting-enable region of the underground wall is reinforced by the reinforcing member, and both ends in the circumferential direction of the cutting-enable member are connected to connect to the reinforcing member. The member for a shield method according to any one of claims 1 to 3, wherein a member is provided.

  According to invention of Claim 4, since the connection member for connecting with a reinforcement member is provided in the both ends of the circumferential direction of a cutting-enable member, connection with the wall member for shield methods and a reinforcement member is carried out. It can be done easily.

The present invention can also be applied to a non-curved cutting enabling member.
That is, as in the invention described in claim 5, a resin-molded body reinforced with long fibers so as to be oriented in a predetermined direction, which is long in the fiber orientation direction, and a cut-enable member Connecting members provided at both ends of the thin-walled member, a thicker portion is formed on the cut-enable member, and a thin portion that is thinner in the thickness direction than the thick portion is formed between the thick portions. Is formed, and the cutting enabling member is arranged in the cutting enabling region of the underground wall so that the concave portion is inside, and the shield machine penetrates the cutting enabling region of the underground wall and starts or reaches It is possible to use a wall member for a shield method characterized in that

And an underground wall can be formed using the wall member for shield construction methods in any one of Claims 1-5 mentioned above (Claim 6).
Moreover, the underground wall of Claim 6 is formed, and a shield machine can start or reach | penetrate by penetrating the cutting possible area | region of an underground wall, and can perform a shield construction method (Claim 7).

  According to the wall member for a shield method of the present invention, it is possible to excavate with a shield excavator and reinforce the underground wall.

Hereinafter, specific examples of the present invention will be described.
FIG. 1 is a perspective view showing an underground wall in the first embodiment of the present invention. FIG. 2 is a schematic view showing a method of forming a tunnel by a shield method using the underground wall of the present invention. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a perspective view showing a wall member for a shield method according to the present invention. FIG. 5 is a cross-sectional perspective view of the underground wall shown in FIG.

  The underground wall 1 in the first embodiment of the present invention is shown in FIG. And the underground wall 1 is a wall provided in the ground, and becomes a wall of a shaft formed when used in the shield method. The underground wall 1 is provided on the ground 91 and is located underground. A space 92 is provided inside the underground wall 1.

  Then, the tunnel 90 can be formed by the shield method using the underground wall 1. As shown in FIG. 2, this underground wall 1 is provided at the starting point and the arriving point of the tunnel 90, the shield excavator 95 is lowered into the space 92 in the underground wall 1 on the starting point side, and shield excavation is performed. While excavating with the machine 95, the tunnel 90 is formed to the underground wall 1 on the arrival point side.

The underground wall 1 is made of concrete, and a concrete portion 12 is reinforced by a strength portion 13 as shown in FIG. The strength portion 13 includes a shield construction wall member 10 and a reinforcing member 11 that is a reinforcing bar. The shield construction wall member 10 and the reinforcement member 11 are disposed inside the underground wall 1.
The underground wall 1 has a cylindrical shape, and the cross-sectional shape of the space 92 is circular. An opening 94 is formed above the underground wall 1, and the other part is surrounded by earth and sand 97.

  Further, as shown in FIG. 1 and the like, the underground wall 1 has a start reaching portion 96 which is a position where the shield starts and arrives at the shield method. This position is cut as described later. It is aligned with the enabling area 20. In addition, the outer diameter of the enabling region 20 is larger than the outer diameter of the shield excavator 95, larger than the range excavated by the shield excavator 95, and has a size that does not protrude.

  The underground wall 1 is formed by embedding a shield method wall member 10 and a reinforcing member 11 in concrete, but is a region in which a cutting enabling member 40 of the shield method wall member 10 described later is disposed. The enabling region 20 has a substantially circular shape.

As shown in FIG. 4, the shield method wall member 10 is provided with a cutting enable member 40 and a connecting member 41.
The cutting enabling member 40 is formed by laminating laminated plates 40b. The laminated plate 40b is made of a material that can be excavated by the shield excavator 95, and the shield excavator 95 can pass through even if the cutting enable member 40 is disposed. The specific material of the laminated board 40b is a long fiber reinforced polyurethane foamed resin, which is excellent in strength.
The laminated plate 40b is a long plate that is long in the circumferential direction R and thin in the thickness direction T, and is laminated so that the lamination direction of the laminated plate 40b is the thickness direction T.

  The cutting enabling member 40 has a curved curved rod shape and is long in the circumferential direction R, and its curvature is matched to the cylindrical shape of the underground wall 1 as shown in FIG. The cutting enabling member 40 has a circumferential direction R, a thickness direction T, and a width direction W. The circumferential direction R is curved, and the inside and outside of the curve is the thickness direction T.

In the vicinity of both ends of the cutting enabling member 40 in the circumferential direction R, thick portions 42 are formed. The thick portion 42 is a portion that is thicker in the thickness direction T than the other portions. A thin portion 43 thinner than the thick portion 42 is formed between the thick portions 42.
The thick portion 42 is formed by increasing the number of laminated plates 40 b to be laminated with respect to the thin portion 43. Further, the laminated plate 40b of the thick portion 42 is laminated more inside the curve than the thin portion 43, and the inside of the thick portion 42 protrudes to form a protruding portion 42a. A recess 43a is formed on the surface.

  The cutting enabling member 40 is located on the outer side 50, the inner side 51, end surfaces 52, 53 located at both ends in the circumferential direction R, and both sides in the width direction W. Side surfaces 54 and 55 are formed, and stepped portions 56 and 57 located at the boundary between the thick portion 42 and the thin portion 43, and between the stepped portions 56 and 57 and the end surfaces 52 and 53. Protruding surfaces 58 and 59 are formed.

  The laminated plate 40b of the thick portion 42 has a shorter length in the circumferential direction R toward the projecting surfaces 58 and 59, and the stepped portions 56 and 57 are inclined. Therefore, when the concrete is poured after the strength portion 13 is disposed, it can be easily flown into the vicinity of the stepped portions 56 and 57, and when the pressure is applied from the outside of the underground wall 1, the stepped portion. Generation of stress concentration at 56 and 57 can be reduced.

  The layer at an arbitrary position in the thickness direction T may be constituted by one laminated plate 40b or may be constituted by a plurality of laminated plates 40b. In addition, when a plurality of laminated plates 40b are used, the strength is reduced by making the position of the boundary portion different from the position of the boundary portion of other layers, for example, by changing the position of the boundary portion between adjacent layers. Can be prevented.

Moreover, the fiber orientation direction of the laminated board 40b which is a long fiber reinforced polyurethane foam resin is the circumferential direction R. Therefore, the strength is high even when a bending stress is applied in a direction in which the curvature in the circumferential direction R is changed.
And when manufacturing the cutting enable member 40, after manufacturing a flat thing by continuous shaping | molding, this is cut | disconnected to predetermined length, the laminated board 40b is manufactured, and also this will be in a curved state. The laminated plate 40b is bonded and fixed to the other.

The connecting member 41 is a metal bar-like portion that is fixed to the end of the cutting enabling member 40 in the circumferential direction R. The connecting member 41 is provided at both ends of the cutting enable member 40 and protrudes from the end faces 52 and 53 of the cutting enable member 40.
And the connection member 41 is fixed with the reinforcement member 11, and the wall member 10 for shield methods and the reinforcement member 11 become integral, and the underground wall 1 is reinforced. This fixing is performed by welding or the like on site.
In addition, the fixing of the connecting member 41 to the cutting enable member 40 is not particularly limited, but can be performed by inserting into the holes formed in the end faces 52 and 53.

The underground wall 1 is formed by embedding a shield construction wall member 10 in concrete. The position in the thickness direction of the shield construction wall member 10 is closer to the outside of the underground wall 1 as shown in FIG.
Then, as shown in FIG. 5, the cutting enable member 40 of the shield method wall member 10 in the strength portion 13 is disposed in the cutting enable region 20 through which the shield excavator 95 passes. . The cutting enabling region 20 has a substantially circular shape in conformity with the shield excavator 95.

  The shield construction wall member 10 is arranged such that the outer side surface 50 is on the outer side, the inner side surface 51 is on the inner side (space 92 side), and the side surface 54 is on the upper side. Then, the plurality of shield construction wall members 10 are arranged in the vertical direction to form the cutting enable region 20. Since it is sufficient that the connecting member 41 and the reinforcing member 11 are not disposed in the cutting enabling region 20, when the cutting enabling region 20 has a circular shape like the cutting enabling region 20 of the present embodiment, The wall member 10 for the shield method disposed in the lower part can be made slightly shorter than the others.

  In addition, the connecting member 41 is provided only at both ends of the cutting enable member 40 and is fixed to the reinforcing member 11. Since the cutting enabling member 40 is connected to the reinforcing member 11 via the connecting member 41, When a force is applied to the inner wall 1 from the outside, the cutting enabling member 40 is in a stress state close to a beam that supports a uniform load at both ends. In the case of such a stress state, there is a place where the bending stress becomes 0 at a distance from the end faces 52 and 53. However, by arranging the stepped portions 56 and 57 in the vicinity thereof, the stepped portions 56 and 57 are arranged in the vicinity thereof. It is possible to reduce the deformation in the shape portions 56 and 57.

And the strength part 13 which consists of the wall member 10 for a shield construction method and the reinforcement member 11 makes one round of the circumferential direction R of the underground wall 1 as FIG. 3 shows, and also from above the underground wall 1 The whole is reinforced to the bottom.
Further, the position of the strength portion 13 in the thickness direction T is closer to the outside, and the concrete portion 12 is thicker inside than the outside of the strength portion 13.

  In addition, the structures such as the shape of the reinforcing member 11 of the strength portion 13 may be a known one used for reinforced concrete. Moreover, a well-known method can also be used for fixation with the connection member 41 of the wall member 10 for shield methods.

  The underground wall 1 is formed by forming a cylindrical hole in the ground, placing a shield construction wall member 10 in this hole, and then filling and solidifying the concrete to form a concrete portion 12. Is called. Furthermore, a space 92 is formed by excavating the inside of the underground wall 1 to form a vertical shaft.

  The method of disposing the strength portion 13 when forming the underground wall 1 can be made to enter the cylindrical hole in a state where the shield construction wall member 10 and the reinforcing member 11 are all assembled. It can also be made to approach while gradually assembling from the portion to be arranged.

  And since the completed underground wall 1 is reinforced by the intensity | strength part 13, intensity | strength is high. In addition, the concrete portion 12 enters the recess 43a, and the displacement between the shield method wall member 10 and the concrete portion 12 hardly occurs. Furthermore, since the thick portions 42 are formed at both ends of the cutting enable member 40, the strength in the vicinity of the end surfaces 54 and 55 where a large shear force is generated can be ensured.

  When the tunnel 90 is formed by the shield method using the above-described underground wall 1, the shield excavator 95 is lowered into the space 92 of the underground wall 1, and the tunnel 90 is dug from the start arrival part 96. Since the start reaching part 96 is the cut-enable area 20 of the underground wall 1, it can be dug by the shield excavator 95 as it is.

  The tunnel 90 is dug from the start arrival part 96, and the underground wall 1 is also formed at the end point of the tunnel 90 as shown in FIG. The cutting enabling region 20 is also formed in the underground wall 1 on the end point side, and the shield excavator 95 passes through the underground wall 1 and moves to the inside of the underground wall 1 to complete the tunnel 90. .

  As described above, the underground wall 1 using the wall member 10 for the shield method according to the present embodiment is used to reinforce the underground wall 1 while enabling the shield excavator 95 to perform excavation by performing the shield method. Can do.

  Although the cutting enabling member 40 of the above-described shield method wall member 10 is curved, it may be not curved or may be a linear rod. In this case, as in the above-described embodiment, a polyurethane foamed resin molded body reinforced with long fibers can be used, which is long in the fiber orientation direction, and the connecting members 41 are provided at both ends thereof. Then, the cut-enable member 40 is provided with a thick portion 42 and a thin portion 43 formed between the thick portions 42 in the thickness direction of the thick portion 42 to provide a recess 43a. 40 is arrange | positioned in the cutting possible area | region 20 of the underground wall 1 so that the recessed part 43a may become an inner side.

Although the underground wall 1 of the above-described embodiment has the concrete portion 12 formed of concrete, mortar or the like can be used.
Moreover, although the reinforcing bar 11 was used for the reinforcement member 11 of the wall member 10 for shield methods of above-described embodiment, you may use other things, such as a steel frame.

It is the perspective view which showed the underground wall in the 1st Embodiment of this invention. It is the schematic diagram which showed the method of forming a tunnel by the shield construction method using the underground wall of this invention. It is AA sectional drawing of FIG. It is the perspective view which showed the wall member for shield methods of this invention. It is a cross-sectional perspective view of the underground wall shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground wall 10 Shield construction method wall member 11 Reinforcement member 13 Strength part 20 Cutting possible area 40 Cutting enabling member 40b Laminate plate 42 Thick part 43 Thin part 43a Recess 95 Shield excavator R Circumferential direction T Thickness direction

Claims (7)

It has a cutting enabling member that is a curved rod shape having a circumferential direction, a thickness direction, and a width direction, and the circumferential direction of the cutting enabling member is curved, and thick portions are formed at both ends in the circumferential direction. A thin part thinner in the thickness direction than the thick part is formed between the thick parts, and a concave part is formed inside the curve by the thin part,
The cutting enabling member is arranged in the cutting enabling region of the underground wall so that the recess is on the inside, and the shield machine can start or reach through the cutting enabling region of the underground wall. A wall member for the shield method.   It is formed using a laminated plate laminated in the thickness direction, and the thick portion is formed by increasing the number of laminated plates laminated on the thin portion. Item 2. A wall member for a shield method according to Item 1.   3. The wall member for a shield method according to claim 2, wherein a polyurethane foam resin molded body reinforced with long fibers is used for the laminate, and the fibers are oriented in the circumferential direction.   The region other than the cutting-enable region of the underground wall is reinforced by the reinforcing member, and connecting members for connecting to the reinforcing member are provided at both ends in the circumferential direction of the cutting-enable member. The wall member for a shield construction method according to any one of claims 1 to 3. A resin molded body reinforced with long fibers so as to be oriented in a predetermined direction, having a cutting enable member long in the fiber orientation direction, and connecting members provided at both ends of the cutting enable member, enabling cutting. The member has a thick part and a thin part formed between the thick parts in the thickness direction than the thick part, and the concave part is formed by the thin part,
The cutting enabling member is arranged in the cutting enabling region of the underground wall so that the recess is on the inside, and the shield machine can start or reach through the cutting enabling region of the underground wall. A wall member for the shield method.   An underground wall formed by using the wall member for a shield method according to any one of claims 1 to 5.   A shield construction method, wherein the underground wall according to claim 6 is formed, and the shield excavator starts or reaches through a cutting-enable area of the underground wall.

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