JP2007040018A - Tunnel structure for branch section or junction section of underground passage and its execution method - Google Patents

Tunnel structure for branch section or junction section of underground passage and its execution method Download PDF

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JP2007040018A
JP2007040018A JP2005226828A JP2005226828A JP2007040018A JP 2007040018 A JP2007040018 A JP 2007040018A JP 2005226828 A JP2005226828 A JP 2005226828A JP 2005226828 A JP2005226828 A JP 2005226828A JP 2007040018 A JP2007040018 A JP 2007040018A
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tunnel
shield tunnel
shield
portion
section
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JP2005226828A
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JP4584068B2 (en
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Masaru Kawagoe
勝 河越
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Kumagai Gumi Co Ltd
株式会社熊谷組
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel structure for a branch section or a junction section of an underground passage capable of increasing strength against soil pressure or the like of the tunnel structure and thereby carrying out economical construction work of the tunnel structure for the branch section or the junction section of the underground passage without reinforcing the lining of each shield tunnel and enlarging an auxiliary tunnel section. <P>SOLUTION: The tunnel structure for the branch section or the junction section of the underground passage has a first shield tunnel and a second shield tunnel approximately parallel with each other communicated through an opening section provided to each side section and a reinforcing means for reinforcing the first shield tunnel and the second shield tunnel. The second shield tunnel consists of a tunnel body section and two auxiliary tunnel sections respectively combined with the tunnel body section, and each axis is parallel with the axis of the tunnel body section. The auxiliary tunnel sections are connected to the first shield tunnel. The reinforcing means includes a plurality of projected arch members in an upper part and a plurality of projected arch members in a lower part which are fixed to each shield tunnel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tunnel structure for a branching part or a junction part of an underground road and a construction method thereof.

Conventionally, as a construction method of a tunnel structure for a branch portion or a junction portion of an underground road, a first shield tunnel and a second shield tunnel are constructed, and the first shield tunnel and the second shield tunnel are After the ground is improved, the ground is excavated to allow the first shield tunnel and the second shield tunnel to communicate (for example, see Patent Document 1).
JP2003-138899

  However, since the improvement of the ground in the above construction method needs to be performed over a relatively wide range, the improvement of the ground requires a lot of construction cost and construction period. Therefore, in order to enable economical construction of the junction or junction of the underground road, there is a tunnel structure for the junction or junction of the underground road and its construction method with minimal ground improvement. It has been proposed (Japanese Patent Application No. 2004-199650).

  The proposed tunnel structure has a first shield tunnel and a second shield tunnel that communicate with each other through an opening provided on each side, and the second shield tunnel includes a main body tunnel portion, It consists of two auxiliary tunnel parts that are integrated with the main body tunnel part. The axis of the auxiliary tunnel portion is parallel to the axis of the main body tunnel portion, and the auxiliary tunnel portion is in a position in contact with the first shield tunnel. According to this tunnel structure, excavation of the ground between the openings for communicating the first shield tunnel and the second shield tunnel is performed between the auxiliary tunnel portion and the first shield tunnel. This can be done by improving the ground near the contact portion. Although the construction of the auxiliary tunnel portion is required, since the range of the ground to be improved is local, economical construction of the branch portion or the junction portion of the underground road becomes possible.

  However, in the proposed tunnel structure, when it is intended to increase the strength against earth pressure and water pressure (hereinafter referred to as “earth pressure”), the lining of each shield tunnel is strengthened and the auxiliary tunnel portion is large-sized. There is a problem of requiring countermeasures such as

  The object of the present invention is to increase the strength of the tunnel structure against earth pressure, etc. without strengthening the lining of each shield tunnel and increasing the size of the auxiliary tunnel portion, and thereby the branching or confluence portion of the underground road It is to enable economical construction of tunnel structure for.

  The present invention increases the strength of the tunnel structure against earth pressure or the like by reinforcing the tunnel structure for the branching or joining part of the underground road using the reinforcing means.

  According to the present invention, a tunnel structure for a branch or junction of an underground road has a first shield tunnel and a second shield that are provided substantially in parallel and communicate with each other through openings provided in the respective sides. A tunnel and reinforcing means for reinforcing the first shield tunnel and the second shield tunnel. The second shield tunnel includes a main body tunnel portion and two auxiliary tunnel portions each integral with the main body tunnel portion, and an axis of each auxiliary tunnel portion is parallel to an axis of the main body tunnel portion, The auxiliary tunnel portion is in a position in contact with the first shield tunnel. The reinforcing means includes a plurality of upwardly projecting arch members and a plurality of downwardly projecting arch members fixed to the first shield tunnel and the main body tunnel portion of the second shield tunnel. Including. Thereby, the first shield tunnel and the second shield tunnel can be reinforced. That is, by supporting a part of earth pressure or the like by the arch member, earth pressure or the like acting on the lining of each shield tunnel can be reduced. Therefore, the strength of the tunnel structure against earth pressure or the like can be increased without strengthening the lining of each shield tunnel or increasing the size of the auxiliary tunnel portion.

  According to the present invention, the construction method of the tunnel structure for the junction or branching portion of the underground road first constructs the first shield tunnel, and then the main body tunnel portion and each axis line is the main body tunnel portion. A second shield tunnel composed of two auxiliary tunnel portions parallel to the axis of the first shield tunnel is constructed so as to be substantially parallel to the first shield tunnel and the auxiliary tunnel portion in contact with the first shield tunnel. . Thereafter, a plurality of upwardly projecting arch members and a plurality of downwardly projecting arch members are attached to each of the arch members using excavation means attached to each of the first shield tunnel and the second shield tunnel. Insert into the upper or lower ground. Thereafter, each one end of the arch member is fixed to the lining of the first shield tunnel, and the other end is fixed to the lining of the main body tunnel portion of the second shield tunnel. Thereafter, an opening is provided in each side portion of the first shield tunnel and the second shield tunnel, and the ground between the openings is excavated, and the first shield tunnel, the second shield tunnel, To communicate.

  The excavation means may include a pipe having a nozzle for injecting high-pressure water onto the ground, a discharge pipe for discharging shear, and a guide blade for preventing diffusion of the high-pressure water. In this case, since the ratio of the space occupied by the pipe in each arch member is relatively small, the diameter of the discharge pipe can be made relatively large. Thereby, the shear can be discharged efficiently, and the arch member can be efficiently constructed. The excavating means includes an inner pipe having a rotating bit for excavating the ground at the tip, a tip conduit having the inner pipe inside, and a discharge pipe attached to the inner pipe for discharging shear. Can be provided. A gap is provided between the leading conduit and the inner pipe, and the gap communicates with the face and the discharge pipe. Thereby, the arch member can be inserted into a relatively strong ground.

  According to the present invention, the strength against the earth pressure of the tunnel structure can be increased by reinforcing the first shield tunnel and the second shield tunnel using the reinforcing means, thereby Allows economical construction of tunnel structures for road junctions or junctions.

  Referring to FIGS. 1 and 2, which show a tunnel structure 10 for a junction or branch of an underground road, the tunnel structure has a substantially parallel first shield tunnel 14 and a second shield tunnel each provided with an underground road 12. A shield tunnel 16 is provided. The covering of the first shield tunnel 14 and the second shield tunnel 16 is made of a steel segment or a composite segment using reinforced concrete and a steel plate. In order to provide the junction or branch of the underground road 12, an opening 18 is provided on each side of the first shield tunnel 14 and the second shield tunnel 16. The shield tunnel 16 communicates through the opening 18. The length of the opening 18 in the axial direction of the first shield tunnel 14 is about 100 m. The cross section of the first shield tunnel 14 is a circle having a diameter of about 11 m, but may be an ellipse or a rectangle instead of a circle.

  The 2nd shield tunnel 16 has the main body tunnel part 20 for providing the underground road 12, and the two auxiliary tunnel parts 22 united with this. The cross section of the main body tunnel portion 20 is a circle having a diameter of about 7 m, but may be an ellipse or a rectangle instead of a circle. Further, the axis of each auxiliary tunnel portion 22 is parallel to the axis of the main body tunnel portion 20, and the auxiliary tunnel portion 22 is in contact with the first shield tunnel 14. The excavation of the ground between the openings 18 to make the first shield tunnel and the second shield tunnel communicate with each other is performed on the ground in the vicinity of the contact portion 24 between the first shield tunnel 14 and the auxiliary tunnel portion 22. This is done by improving it. Since the area of the ground to be improved is local, economical construction of a branching part or a joining part of the underground road 12 becomes possible.

  In the contact portion 24, a plurality of freezing pipes 26 are provided on the linings of the first shield tunnel 14 and the auxiliary tunnel portion 22 (FIG. 6). The improvement of the ground is performed by freezing the ground using the freezing pipe 26. Further, a groove 28 having an arc-shaped cross section that matches the shape of the auxiliary tunnel portion 22 is formed in the lining of the first shield tunnel 14 in the contact portion 24 (FIG. 6). The groove 28 is filled with a filling material 30 such as mortar or synthetic resin that can be excavated by a shield machine (not shown) (FIG. 4). The filling material is shielded together with the construction of the second shield tunnel 16. It is excavated by an excavator (not shown) (FIG. 6). Thereby, the 1st shield tunnel 14 and the 2nd shield tunnel 16 can be made to contact reliably.

  Moreover, in the contact part 24, the some connection member 32 is arrange | positioned through each cover of the 1st shield tunnel 14 and the auxiliary tunnel part 22, and is being fixed to each cover by welding (FIG. 6). . Thereby, the 1st shield tunnel 14 and the 2nd shield tunnel 16 can be fixed firmly. The connecting member 32 is a steel bar having a square cross section with a side of about 100 mm, but may be a steel bar instead of the steel bar. The installation interval of the connecting members 32 in the axial direction of the first shield tunnel 14 or the second shield tunnel 16 is about 500 mm. Further, in order to perform permanent water stop between the first shield tunnel 14 and the second shield tunnel 16, a water stop plate 34 is disposed between the openings 18, and the first shield tunnel 14 and the second shield tunnel 14 The two shield tunnels 16 are fixed to the respective linings by welding.

  As shown in FIGS. 1 and 2, the tunnel structure 10 includes a plurality of upwardly projecting arch members 38 and a plurality of downwardly projecting arch members 40 which are reinforcing means 36. The arch members 38 are respectively arranged from the upper part of the first shield tunnel 14 to the upper part of the main body tunnel part 20 of the second shield tunnel 16, and the arch members 40 are respectively second from the lower part of the first shield tunnel 14. The shield tunnel 16 is disposed over the lower part of the main body tunnel portion 20. Each end of the arch members 38 and 40 passes through each lining through a through hole 42 provided in the lining of each shield tunnel, and is fixed to each lining by welding. The arch members 38 and 40 are made of steel and have a circular hollow cross section with a diameter of about 300 mm to 500 mm. The installation interval of the arch members 38 and 40 in the axial direction of the first shield tunnel 14 or the second shield tunnel 16 is about 1.0 m to 1.5 m. Thereby, the first shield tunnel and the second shield tunnel can be reinforced. That is, by supporting a part of the earth pressure or the like by the arch members 38 and 40, the earth pressure or the like acting on the lining of each shield tunnel can be reduced. Therefore, the strength of the tunnel structure 10 against earth pressure or the like can be increased without strengthening the lining of each shield tunnel or increasing the size of the auxiliary tunnel portion 22.

  1 and 2, when constructing the tunnel structure 10 for the junction or branch of the underground road, first, as shown in FIGS. And a segment having a groove 28 previously filled with a filling material 30 (FIG. 4).

  Next, as shown in FIGS. 5 and 6, the second shield tunnel 16 is constructed so that the auxiliary tunnel portion 22 and the first shield tunnel 14 are in contact with each other substantially parallel to the first shield tunnel 14. At this time, the auxiliary tunnel portion 22 and the first shield tunnel 14 are formed by constructing the second shield tunnel 16 while excavating the filling material 30 filled in the grooves 28 by a shield machine (not shown). Make contact. Further, a segment provided with a freezing pipe 26 is disposed at the contact portion 24 between the first shield tunnel 14 and the auxiliary tunnel portion 22.

  Next, liquid nitrogen is sent to the freezing pipe 26 to freeze the ground in the vicinity of the contact portion 24 and improve the ground between the first shield tunnel 14 and the auxiliary tunnel portion 22. By bringing the first shield tunnel 14 and the auxiliary tunnel portion 22 into contact with each other, the range of ground to be improved can be minimized, thereby reducing the cost required for ground improvement. In addition, the ground may be improved by injecting a chemical instead of the above example performed by freezing.

  Next, a connecting member 32 is installed to fix the first shield tunnel 14 and the second shield tunnel 16. The connecting member 32 is provided by providing holes 48 penetrating the linings of the first shield tunnel 14 and the auxiliary tunnel portion 22, inserting the connecting members into the holes, and welding and fixing the linings. By doing. Thereby, the 1st shield tunnel 14 and the 2nd shield tunnel 16 can be fixed firmly.

Thereafter, the arch members 38 and 40 are constructed. As shown in FIG. 7, the construction of the arch members 38 and 40 uses a method known in Patent Document 2 in which a curved pipe is inserted into the ground using high-pressure water. First, an arch member 38a to be inserted into the ground and excavation means 50 attached to the arch member are prepared. The excavating means 50 includes a pipe 56 provided with a nozzle 54 for injecting the high-pressure water 52 onto the ground, a discharge pipe 60 for discharging the shear 58, and a guide blade 62 for preventing the high-pressure water 52 from diffusing. Is provided. Next, the guide blade 62 is attached to the distal end portion of the arch member 38a, the discharge pipe 60 having the pipe 56 attached to the outer peripheral portion is inserted into the arch member 38a, and the nozzle 54 is disposed at the distal end portion of the arch member 38a. Install as follows.
JP 2004-238854 A

  Next, the ground above the first shield tunnel 14 is improved by injecting a chemical solution, and as shown in FIG. 8, a through hole 42a for inserting the arch member 38a into the lining of the upper portion of the first shield tunnel 14 is provided. Provide. Next, the arch member 38a is inserted into the ground above the first shield tunnel 14 through the through hole 42a, the high-pressure water 52 is sprayed from the nozzle 54 onto the ground, and the shear 58 is discharged from the discharge pipe 60 while the arch member is interposed therebetween. 38a is propelled by a hydraulic jack (not shown) (FIG. 7). Next, similarly to the lining of the first shield tunnel 14, a through hole 42b for reaching the arch member 38a is provided in the lining of the upper portion of the main body tunnel portion 20, and the arch member 38a is passed through the through hole 42b. The main body tunnel 20 is reached. Thereafter, the arch member 38 a is welded and fixed to the lining of each of the first shield tunnel 14 and the main body tunnel portion 20. Then, the other arch member 38 is fixed to the lining of each upper part of the 1st shield tunnel 14 and the main body tunnel part 20 similarly to the arch member 38a.

  Thereafter, similarly to the arch member 38, the arch member 40 is inserted into the ground below the first shield tunnel 14 and the main body tunnel portion 20 to cover the lower portions of the first shield tunnel 14 and the main body tunnel portion 20. Weld and fix to. The arch members 38 and 40 may be propelled from the second shield tunnel 16 toward the first shield tunnel 14 instead of propelling from the first shield tunnel 14 toward the second shield tunnel 16. . The arch member 40 may be installed prior to the arch member 38. In the above method using high-pressure water, the ratio of the space occupied by the pipe 56 in each arch member is relatively small, and therefore the diameter of the discharge pipe 60 that discharges the shear 58 can be made relatively large. Thereby, the shear 58 can be discharged efficiently, and the arch members 38 and 40 can be efficiently constructed. Further, by providing the guide blade 62 at the tip of the arch members 38, 40, it is possible to suppress excessive excavation due to the high-pressure water 52 acting extensively on the surrounding ground, so that the stability of the ground is not impaired.

For the construction of the arch members 38 and 40, instead of the above method using high-pressure water, as shown in FIG. 9, a method of inserting a curved pipe into the ground using a rotating bit as known in Patent Document 3 is used. You can also. In this case, the excavating means 50 includes an inner pipe 68 having a rotating bit 66 rotated by a motor 64 at the tip, a tip conduit 70 having the inner pipe inside, and a shear 72 attached in the inner pipe 68. And a discharge pipe 74 for discharging the gas. A gap 76 is provided between the leading conduit 70 and the inner pipe 68, and the gap communicates with the face and the discharge pipe 74. At the time of construction of the arch member 38a, an arch member 38a (not shown) is connected to the rear end portion of the leading conduit 70, and the rotating bit 66 is rotated to excavate the ground, while the shear 72 is connected to the leading conduit 70 and the inner pipe 68. And is discharged from the discharge pipe 74 through the gap 76 between the two. Meanwhile, the arch member 38a is inserted into the ground by a hydraulic jack (not shown). Thereby, it becomes possible to insert the arch member 38a into a relatively strong ground.
JP-A-11-81865

  Next, as shown in FIG. 2, an opening 18 is provided on each side of the first shield tunnel 14 and the second shield tunnel 16, and the ground between the openings is excavated to form the first shield tunnel. 14 communicates with the second shield tunnel 16. Then, the water stop plate 34 is arrange | positioned between the opening parts 18, and it fixes to each lining of the 1st shield tunnel 14 and the 2nd shield tunnel 16 by welding.

  According to the present invention, the first shield tunnel 14 and the second shield tunnel 16 can be reinforced using the reinforcing means 36. Accordingly, the strength of the tunnel structure 10 against earth pressure and the like can be increased without strengthening the lining of each shield tunnel and increasing the size of the auxiliary tunnel portion 22. Allows economical construction of tunnel structures.

The perspective view of the tunnel structure for the branch part or junction part of an underground road based on this invention. Sectional drawing of the tunnel structure for the branch part or confluence | merging part of an underground road based on this invention. Sectional drawing of the 1st shield tunnel after constructing | assembling the 1st shield tunnel based on this invention. FIG. 4 is an enlarged cross-sectional view taken along line 4 in FIG. 3. Sectional drawing of the 1st shield tunnel and the 2nd shield tunnel after fixing the 1st shield tunnel and the 2nd shield tunnel based on this invention. FIG. 6 is an enlarged cross-sectional view taken along line 6 in FIG. 5. Sectional drawing of the arch member front-end | tip part when the arch member is inserted in the ground based on 1st Example of this invention. Sectional drawing of the 1st shield tunnel after installing the arch member based on this invention, and a 2nd shield tunnel. Sectional drawing of the arch member front-end | tip part when the arch member is inserted in the ground based on 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tunnel structure 12 Underground road 14 1st shield tunnel 16 2nd shield tunnel 18 Opening part 20 Main body tunnel part 22 Auxiliary tunnel part 36 Reinforcement means 38, 40 Arch member 52 High pressure water 54 Nozzle 56 Piping 58, 72 Slip 60, 74 Discharge pipe 62 Guide blade 66 Rotating bit 68 Inner pipe 70 Lead pipe 76 Clearance

Claims (4)

  1.   The first shield tunnel and the second shield tunnel that are provided substantially in parallel and communicate with each other through openings provided on the respective side portions, and the reinforcement that reinforces the first shield tunnel and the second shield tunnel. A tunnel structure for a junction or junction of an underground road, wherein the second shield tunnel is a main body tunnel portion, and each axis is integral with the main body tunnel portion, The auxiliary tunnel portion is in a position in contact with the first shield tunnel, and the reinforcing means includes the first shield tunnel and the second tunnel portion. A plurality of upwardly projecting arch members and a plurality of downwardly projecting arms fixed to the main body tunnel portion of the two shield tunnels. Including Ji member, tunnel structure.
  2. A tunnel construction method for a junction or branch of an underground road,
    Building a first shield tunnel,
    A second shield tunnel comprising a main body tunnel portion and two auxiliary tunnel portions each having an axis parallel to the axis of the main body tunnel portion is substantially parallel to the first shield tunnel and the auxiliary tunnel portion. Is constructed so as to contact the first shield tunnel,
    A plurality of upwardly projecting arch members and a plurality of downwardly projecting arch members may be disposed above the first shield tunnel and the second shield tunnel using excavation means attached to each arch member. Inserting it into the ground below,
    Fixing one end of the arch member to the lining of the first shield tunnel, and fixing the other end to the lining of the main body tunnel portion of the second shield tunnel,
    Openings are provided in the respective side portions of the first shield tunnel and the second shield tunnel, and the ground between the openings is excavated to communicate the first shield tunnel and the second shield tunnel. The construction method of the tunnel structure including making it.
  3.   The excavation means includes a pipe having a nozzle for injecting high-pressure water onto the ground, a discharge pipe for discharging shear, and a guide blade for preventing diffusion of the high-pressure water. The tunnel construction method described.
  4. The excavation means includes an inner pipe having a rotating bit for excavating the ground at a tip portion, a tip conduit having the inner pipe inside, and a discharge pipe attached to the inner pipe for discharging shear. The tunnel structure construction method according to claim 2, wherein a gap is provided between the leading conduit and the inner pipe, and the gap communicates with the face and the discharge pipe.

JP2005226828A 2005-08-04 2005-08-04 Construction method of tunnel structure for junction or junction of underground road Expired - Fee Related JP4584068B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101899982A (en) * 2010-07-09 2010-12-01 山东理工大学 Lane (tunnel) surrounding rock forming and unloading integrated device and simulation test method
CN102094654A (en) * 2011-03-28 2011-06-15 中铁二院工程集团有限责任公司 Three-track tunnel structure for high speed railway
CN102155232A (en) * 2011-04-02 2011-08-17 中铁二院工程集团有限责任公司 Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition
CN103939124A (en) * 2014-05-13 2014-07-23 武汉中交交通工程有限责任公司 Ventilation, smoke discharge and evacuation system for underwater single-tube double-layer shield traffic tunnel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104265305B (en) * 2014-08-05 2016-06-01 中铁二十一局集团有限公司 What be merged into room, a big cross section hole from room, two light section holes digs method

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JPH09256783A (en) * 1996-03-19 1997-09-30 Kawasaki Heavy Ind Ltd Rectangular shield driving machine and tunnel excavating method
JPH09317397A (en) * 1996-05-29 1997-12-09 Shimizu Corp Large cross-sectional tunnel and constructing method thereof
JPH09328987A (en) * 1996-06-12 1997-12-22 Shimizu Corp Tunnel and its construction method
JPH1181865A (en) * 1997-09-05 1999-03-26 Raito Kogyo Co Ltd Boring method of boring hole
JP2004124489A (en) * 2002-10-02 2004-04-22 Kajima Corp Underground structure and its construction method
JP2004238854A (en) * 2003-02-04 2004-08-26 Kumagai Gumi Co Ltd Method for constructing underground timbering

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09256783A (en) * 1996-03-19 1997-09-30 Kawasaki Heavy Ind Ltd Rectangular shield driving machine and tunnel excavating method
JPH09317397A (en) * 1996-05-29 1997-12-09 Shimizu Corp Large cross-sectional tunnel and constructing method thereof
JPH09328987A (en) * 1996-06-12 1997-12-22 Shimizu Corp Tunnel and its construction method
JPH1181865A (en) * 1997-09-05 1999-03-26 Raito Kogyo Co Ltd Boring method of boring hole
JP2004124489A (en) * 2002-10-02 2004-04-22 Kajima Corp Underground structure and its construction method
JP2004238854A (en) * 2003-02-04 2004-08-26 Kumagai Gumi Co Ltd Method for constructing underground timbering

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101899982A (en) * 2010-07-09 2010-12-01 山东理工大学 Lane (tunnel) surrounding rock forming and unloading integrated device and simulation test method
CN101899982B (en) * 2010-07-09 2012-08-22 山东理工大学 Lane (tunnel) surrounding rock forming and unloading integrated device and simulation test method
CN102094654A (en) * 2011-03-28 2011-06-15 中铁二院工程集团有限责任公司 Three-track tunnel structure for high speed railway
CN102155232A (en) * 2011-04-02 2011-08-17 中铁二院工程集团有限责任公司 Construction method of large-span asymmetrical double-arch railway tunnel under terrain bias pressure condition
CN103939124A (en) * 2014-05-13 2014-07-23 武汉中交交通工程有限责任公司 Ventilation, smoke discharge and evacuation system for underwater single-tube double-layer shield traffic tunnel

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