JP2014091937A - Method for constructing underground space - Google Patents

Method for constructing underground space Download PDF

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JP2014091937A
JP2014091937A JP2012241951A JP2012241951A JP2014091937A JP 2014091937 A JP2014091937 A JP 2014091937A JP 2012241951 A JP2012241951 A JP 2012241951A JP 2012241951 A JP2012241951 A JP 2012241951A JP 2014091937 A JP2014091937 A JP 2014091937A
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tunnel
small
excavation
underground space
turn
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JP6108769B2 (en
Inventor
Katsuhiko Takakura
克彦 高倉
Takashi Imaishi
尚 今石
Takayoshi Nakamura
隆良 中村
Mamoru Osaka
衛 大坂
Taiji Morita
泰司 森田
Yoshio Nishida
与志雄 西田
Yoshifumi Hattori
佳文 服部
Yuichi Ito
友一 伊藤
Atsushi Iwashita
篤 岩下
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Taisei Corp
大成建設株式会社
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Abstract

An underground space construction method for constructing an underground space including a main tunnel without interfering with the main tunnel is proposed.
A plurality of small cross-sectional tunnels along the axial direction of the main tunnel T1 are arranged side by side before or after the construction of the main tunnel T1, and the main tunnel T1 is included in a region surrounded by the plurality of small cross-section tunnels. A method for constructing an underground space in which a large section underground space 1 is formed by excavating an area in a state, and a forward tunnel excavating a tunnel for a small section tunnel from a proximal end 12 to a distal end 11 of the large section underground space 1 A process, a tip excavation process for making the excavator U-turn in the ground outside the cross section of the main tunnel T1 on the tip 11 side of the large section underground space 1, and a return path excavation for excavating the excavator from the tip 11 toward the base end 12 Process.
[Selection] Figure 3

Description

  The present invention relates to an underground space construction method.

  When building a large section underground structure by widening the main tunnel at the branch / junction part of a road tunnel or a station part such as a railway tunnel, a wide shaft is constructed from the ground surface. It is common.

  However, when the depth of a newly installed underground structure is deep, labor and cost are increased for excavation work such as a shaft. Also, in urban areas, it may not be possible to secure a site for excavation.

  As a method of forming a large-section underground space by non-open cutting, there is a method in which a plurality of small-section tunnels are juxtaposed from a preceding tunnel to form an outer shell and excavated inside the outer shell.

  For example, in Patent Document 1, a plurality of small-section tunnels are started from a preceding tunnel, and each small-section tunnel is folded at the end of a planned large-section underground space to surround a natural ground, and a plurality of small-section tunnels are surrounded. A method for constructing an underground structure that forms a large-section underground space by excavating a natural ground surrounded by a cross-sectional tunnel is disclosed.

Japanese Patent No. 4566927

Since the underground structure construction method of Patent Document 1 surrounds a natural ground by a plurality of small cross-section tunnels, it cannot be applied when the main tunnel is dug up in advance.
In addition, when constructing a main tunnel after the construction of underground structures, it is necessary to penetrate through the small-section tunnel group, which takes time.

  An object of the present invention is to solve the above-described problems, and to propose an underground space construction method for constructing an underground space including the main tunnel without interfering with the main tunnel. To do.

  In order to solve the above-described problem, the underground space construction method according to the present invention includes a plurality of small cross-sections arranged in parallel along the axial direction of the main tunnel before or after the construction of the main tunnel. An underground space construction method for excavating the area in a state surrounded by the tunnel in a region surrounded by a tunnel to form a large section underground space, from the base end to the tip of the large section underground space Outgoing excavation step for excavating the excavator for the small section tunnel, tip excavation step for U-turning the excavator in the ground outside the cross section of the main tunnel at the distal end side of the large section underground space, and from the tip A return path excavation step of excavating the excavator toward the base end.

  According to this underground space construction method, since the small-section tunnel is formed so as not to interfere with the main tunnel, construction is possible even when the main tunnel is constructed in advance. In addition, even when the main tunnel is constructed by post-construction, it is not necessary to drill a small-section tunnel, so that the construction is excellent.

  In the tip excavation step, the large section underground space is excavated in an inclined state so that the altitude of the small section tunnel formed by the return path excavation step is different from the altitude of the small section tunnel formed by the forward path excavation step. When the forward excavation process is performed above the horizontal plane passing through the center of the horizontal plane, the backward excavation process is performed above the horizontal plane, and when the forward excavation process is performed below the horizontal plane, It is desirable to perform the return path excavation process on the side.

  According to this underground space construction method, the small section tunnel is divided into the upper half and the lower half of the large section underground space, so that the inclination when turning the small section tunnel can be suppressed to about 45 ° or less. It becomes.

  After the return path excavation step, further comprising a proximal end excavation step of U-turning the excavator in the ground outside the cross section of the main tunnel on the proximal end side of the large section underground space, after the proximal end excavation step, If the forward digging process is performed again, it is possible to eliminate the labor required for the setup change and the like by continuous construction of the small section tunnel.

  From the viewpoint of securing a digging bendable radius of the excavator when making the U-turn at the small section tunnel, the excavator straddles a vertical plane passing through the center of the large section underground space in the tip excavation process. It is desirable to perform construction.

  Further, the distance between the center of the small section tunnel at the start of the U-turn by the excavator and the center of the small section tunnel at the end of the U-turn in the tip excavation process and the base end excavation process is the minimum bending of the small section tunnel. If the radius is twice or more, the workability is further improved.

  According to the underground space construction method of the present invention, it is possible to construct an underground space including the main tunnel without interfering with the main tunnel.

It is sectional drawing of the large-section underground space which concerns on embodiment of this invention. It is a flowchart which shows the underground space construction method of this embodiment. (A) is a top view of the large-section underground space of FIG. 1, (b) It is the same side view. (A) is AA sectional drawing of (a) of FIG. 3, (b) is the BB sectional drawing. It is a figure which shows the start part of a small cross-section tunnel, Comprising: (a) is a top view, (b) is a side view.

  In the underground space construction method according to the embodiment of the present invention, as shown in FIG. 1, a plurality of small-section tunnels t1 to t25 along the axial direction of the existing main tunnel T1 (the vertical direction in FIG. 1) are arranged side by side. Then, a closed cross section 2 is formed, and a region 3 surrounded by the closed cross section 2 (a plurality of small cross section tunnels t1 to t25) is excavated to form a large cross section underground space 1 including the main tunnel T1. Is. The main tunnel T1 may be constructed after the large section underground space 1 is formed.

  In the present embodiment, a case will be described in which the large-section underground space 1 is formed so as to include the main tunnel T1 and the approach tunnel T2 at the junction between the main tunnel T1 and the approach tunnel T2.

  In the large section underground space 1, an outer shell (closed section 2) is formed by a plurality of small section tunnels t1 to t25 arranged in a ring. Adjacent small section tunnels are partially polymerized.

  The small cross-section tunnels t1 to t25 are formed by making a U-turn (turn back) before and after the excavating machine 1 before and after the large cross-section underground space 1 (merging portion). That is, the small cross-section tunnels t1 to t25 are formed by the excavator reciprocating around the area that becomes the large cross-section underground space 1 (see (a) or (b) of FIG. 3).

  In the present embodiment, six excavators (No. 1 to No. 6) reciprocate a plurality of times around the outer circumference of the large section underground space 1, respectively, so that a plurality of small section tunnels ( The first tunnel t1 to the 25th tunnel t25) are juxtaposed. In this embodiment, since a plurality of small cross-section tunnels are formed by one excavator, the number of small cross-section tunnels in construction is the same as that of the excavator, but in this embodiment, FIG. , Different symbols (t1 to t25) are attached to the sections of the small section tunnel appearing in FIG. The number of small cross-section tunnels that form the outer shell (closed cross-section 2) of the large cross-section underground space 1 is not limited.

  As shown in FIG. 2, the construction method of the underground space of this embodiment includes an outward excavation step S1, a distal excavation step S2, a return excavation step S3, a proximal excavation step S4, and an internal excavation step S5. ing.

The forward digging step S1 is a step of digging a small-section tunnel digging machine from the proximal end 12 to the distal end 11 of the large-section underground space 1 (see FIGS. 3A and 3B).
In the forward digging step S1, the digging machine digs along the axial direction of the main tunnel T1.

  The tip excavation step S2 is a step of making a U-turn the excavator in the ground (tip U-turn region 4) outside the cross section of the main tunnel T1 on the tip 11 side of the large section underground space 1 after the forward excavation step S1 ( (See (a) and (b) of FIG. 3).

In the tip excavation step S2, excavation is performed in a state where the altitude of the small section tunnel formed in the return path excavation step S3 is inclined to be different from the altitude of the small section tunnel formed in the forward pass excavation step S1 ((( a)).
Further, when the excavator is U-turned, the excavator straddles the vertical plane CV passing through the center of the large section underground space 1.

Incidentally, the small cross-section tunnels t1~t4 which is construction by forward tunneling step S1, t6, t7 is, since it is formed above the horizontal plane C L passing through the center of the large section underground 1 (closed cross section 2), the return path small section tunnel t20~t25 of applying the excavation process S3 causes the U-turn the excavator so that the upper horizontal plane C L.
Conversely, a small cross-section tunnels t8~t13 which is construction by forward excavation step S1 is, because it is formed below the horizontal plane C L passing through the center of the large section underground 1 (closed cross section 2), return excavation process S3 small section tunnel t14~t19 of applying causes the U-turn the excavator so that the lower side of the horizontal plane C L by.

  In the tip excavation step S2, the large cross-section tunnels t1 to t25 are not in contact with the existing tunnels (main tunnel T1 and approach tunnel T2), and the small cross-section tunnels t1 to t25 are not in contact with each other. A U-turn is started at a position away from the tip of the section underground space 1.

  As shown in FIG. 4 (a), the excavator has a center of a small section tunnel (for example, the first tunnel t1) at the start of the U turn and a small section tunnel (for example, the 20th tunnel) at the end of the U turn. The excavation is performed so that the distance L from the center is at least twice the minimum bending radius of the small-section tunnel.

  Further, the positions of the excavator at the start of the U-turn and at the end of the U-turn are moved from the center of the ring-closed section 2 onto the radiation as necessary to prevent interference between the small-section tunnels. That is, the start point and the end point of the U-turn are not necessarily arranged on the closed ring section 2.

  Further, when the U-turn routes of the small-section tunnel overlap each other, the small-section tunnels are prevented from interfering with each other by shifting back and forth in the tunnel axis direction (left-right direction in FIG. 3).

The return path excavation step S3 is a step of excavating the excavator from the distal end 11 of the large-section underground space 1 toward the proximal end 12 after the distal excavation step S2 (see FIGS. 3A and 3B).
In the return path excavation step S3, the excavator is dug along the axial direction of the main tunnel T1.

  The base excavation step S4 is a step of making the excavator make a U-turn in the ground (base end U-turn region 5) outside the cross section of the main tunnel T1 on the base end 12 side of the large section underground space 1 after the return path excavation step S3. (See (a) and (b) of FIG. 3).

In the proximal excavation process S4, as in the distal excavation process S2, the elevation of the small cross-section tunnel formed by the return path excavation process S3 is inclined so as to be different from the altitude of the small cross-section tunnel formed by the forward excavation process (See (b) of FIG. 4).
Further, when the excavator is U-turned, the excavator straddles the vertical plane CV passing through the center of the large section underground space 1.

The small cross-section tunnels t21~t23 which is construction by backward tunneling process S3, the t25, since it is formed above the horizontal plane C L passing through the center of the ring closure section 2, a small cross-section tunnels of applying the forward excavation process S1 t1, t4-t6 is such that the upper horizontal plane C L, the shield machine is U-turn.
Conversely, a small cross-section tunnels construction by backward tunneling step S3 t15, t16, t18 is because they are formed below the horizontal plane C L passing through the center of the ring closure section 2, to the construction by forward tunneling process S1 small as cross tunnel t8, t10, t12 is the lower horizontal plane C L, the shield machine is U-turn.

  In the proximal excavation step S4, the large-section underground space 1 is provided so that the small-section tunnel does not contact the existing tunnels (the main tunnel T1 and the approach tunnel T2) and the small-section tunnels do not contact each other. A U-turn is started at a position away from the base end of the.

  The excavator has a distance L between the center of the small section tunnel (for example, the 21st tunnel t21) at the start of the U turn and the center of the small section tunnel (for example, the first tunnel t1) at the end of the U turn. The digging is carried out so as to be at least twice the minimum bending radius of the small section tunnel.

  Further, the position of the excavator at the start of the U-turn and the end of the U-turn is moved to the radiation from the center of the closed cross-section 2 as necessary, as shown in FIG. Prevent mutual interference. That is, the start point and end point of the U-turn are not necessarily arranged on the closed ring cross section.

  Further, when the U-turn routes of the small-section tunnel overlap each other, the small-section tunnels are prevented from interfering with each other by shifting back and forth in the tunnel axis direction (left-right direction in FIG. 3).

  After the proximal excavation process S4, the forward excavation process S1, the distal excavation process S2, and the return excavation process S3 are performed again to reciprocate the excavator twice. The number of reciprocations of the excavator is not limited.

  The internal excavation step S5 is a step of excavating the inside of the region 3 surrounded by the small cross section tunnels t1 to t25 to form the large cross section underground space 1 (see FIG. 1).

  In the internal excavation process S5, ground improvement such as a freezing method is performed at positions corresponding to both ends of the large-section underground space 1, and excavation of the region 3 is performed in a state where a wall is built inside. In addition, the structure of the collar part of the large-section underground space 1 is not limited.

Next, the excavation route of each excavator in this embodiment will be described.
In this embodiment, six excavators (No. 1 to No. 6) are used.
In addition, as shown in FIG. 1, the large-section underground space 1 has a first small-section tunnel t1 to a 25th small-section tunnel t25 arranged in parallel counterclockwise from the apex.

Unit 1, the upper side than the horizontal plane C L, the second small section tunnel t2, 21 small cross-section tunnels t21, a first small section tunnel t1 and the 20 small section tunnel t20 excavator for forming.

Unit 1, as shown in (a) and (b) of FIG. 5, to start the excavation from the wall approaches the tunnel T2, the upper side than the horizontal plane C L passing through the center of the main tunnel T1, a second small section tunnel t2 is formed (outward excavation step S1).

  When the second small-section tunnel t2 reaches the tip of the large-section underground space 1, the first unit is offset to the outside of the closed-section cross section 2, and then the ground (tip) on the back side (outside of the tip) of the large-section underground space 1 In the U-turn region 4), the first machine is U-turned to form a U-shaped tunnel that connects the second small-section tunnel t2 and the twenty-first small-section tunnel t21 (tip digging step S2). Unit 1 excavates with a downward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

  When the first car is made a U-turn, the center of the first car is positioned on the center line of the closed ring cross section 2 and then the 21st small cross section tunnel t21 is formed (return excavation process S3).

  And when the 21st small cross section tunnel t21 reaches the base end 12 of the large cross section underground space 1, in the ground (base end U-turn region 5) on the near side (outside of the base end) of the large cross section underground space 1, The first machine is U-turned to form a U-shaped tunnel that connects the 21st small cross-section tunnel t21 and the first small cross-section tunnel t1 (base digging step S4). Unit 1 excavates with an upward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

  When the first car is made a U-turn, the first car is brought closer to the second small section tunnel t2, and the center of the first car is located on the center line of the closed ring section 2 and adjacent to the second small section tunnel t2. The first small cross-section tunnel t1 is formed while cutting a part of the small cross-section tunnel (outward excavation step S1).

  When the first small cross section tunnel t1 reaches the tip 11 of the large cross section underground space 1, the first unit is offset to the outside of the closed ring cross section 2, and then the ground on the back side (outside of the tip) of the large cross section underground space 1 In the (front end U-turn region 4), the first machine is U-turned to form a U-shaped tunnel that connects the first small cross section tunnel t1 and the twentieth small cross section tunnel t20 (front end excavation step S2). Unit 1 excavates with a downward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

When the first car is made a U-turn, the first car is brought closer to the 21st small cross section tunnel t21, and the center of the first car is positioned on the center line of the closed ring cross section 2 and then at the position adjacent to the 21st small cross section tunnel t21. A twentieth tunnel t20 is formed while cutting a part of the 21 small cross-section tunnel t21 (return digging step S3).
Then, when the digging of the 20th tunnel t20 reaches the base end 12 of the large cross-section underground space 1, the No. 1 machine is recovered or left in the ground.

  As shown in FIG. 4A, the U-turn route t2 → t21 and t1 → t20 of Unit 1 overlap in a cross-sectional view. Therefore, the U-turn routes t2 → t21 and t1 → t20 are U-turned at positions separated from each other.

Similarly, the upper side than the horizontal plane C L, the seventh small section tunnel t7 by Unit 2, 25 small cross-section tunnels t25, sixth small section tunnel t6, forming the first 24 small section tunnel t24.

Unit 2, as shown in (a) and (b) of FIG. 5, to start the excavation from the wall approaches the tunnel T2, the upper side than the horizontal plane C L passing through the center of the main tunnel T1, seventh small section tunnel t7, the 25th small cross section tunnel t25, the sixth small cross section tunnel t6, and the 24th small cross section tunnel t24 are formed in this order. The 25th small cross section tunnel t25 is formed at a position adjacent to the first small cross section tunnel t1.
When the excavation of the 24th small cross section tunnel t24 reaches the base end 12 of the large cross section underground space 1, the second machine is recovered or left in the ground.

  As shown in FIGS. 4A and 4B, the U-turn route of Unit 2 (t7 → t25, t6 → t24 in FIG. 4A, t25 → t6 in FIG. 4B) is It overlaps with the U-turn route of Unit 1 (t2 → t21, t1 → t20 in FIG. 4A, t21 → t1 in FIG. 4B) in cross-sectional view. Therefore, Unit 2 makes a U-turn at a position farther from both ends 11 and 12 of the large section underground space 1 than the Unit 1 U-turn route.

  Further, as shown in FIG. 4 (a), the U-turn route t7 → t25 and t6 → t24 of Unit 2 overlap in a sectional view. Therefore, the U-turn routes t7 → t25 and t6 → t24 are U-turned at positions separated from each other.

Similarly, the upper side than the horizontal plane C L, the third small section tunnel t3 by Unit 3, 23 small cross-section tunnels t23, the fourth small section tunnel t4, 22 small cross-section tunnels t22, forming the fifth small section tunnel t5 .

Unit 3, as shown in (a) and (b) of FIG. 5, to start the excavation from the wall approaches the tunnel T2, the upper side than the horizontal plane C L passing through the center of the main tunnel T1, the third small section tunnel After forming t3, the 23rd small cross section tunnel t23, the 4th small cross section tunnel t4, and the 22nd small cross section tunnel t22 in this order, the underground (base end U) on the near side (outside the base end 12) of the large cross section underground space 1 A U-turn is made in the turn region 5) to form a fifth small cross section tunnel t5.
When the excavation of the fifth small section tunnel t5 reaches the tip 11 of the large section underground space 1, the No. 3 machine is recovered or left in the ground.

  As shown in FIGS. 4A and 4B, the U-turn route of Unit 3 (t3 → t23, t4 → t22 in FIG. 4A, t23 → t4, t22 in FIG. 4B) t5) is the U-turn route of Unit 1 and Unit 2 (t2 → t21, t1 → t20, t7 → t25, t6 → t24 in FIG. 4 (a), t21 → t1, t25 in FIG. 4 (b). It overlaps with t6) in cross-sectional view. Therefore, Unit 3 makes a U-turn at a position farther from both ends 11 and 12 of the large section underground space 1 than the U-turn route of Units 1 and 2.

  Further, as shown in FIG. 4 (a), the U-turn route t3 → t23 and t4 → t22 of Unit 3 overlap in a sectional view. Therefore, the U-turn routes t3 → t23 and t4 → t22 are U-turned at positions separated from each other.

Unit 4, in the lower horizontal plane C L, 13 small cross-section tunnels t13, 18 small cross-section tunnels t18, an excavator for forming the first 12 small section tunnel t12 and 19 small section tunnel t19.

Unit 4, as shown in FIG. 5 (b), starts excavation from the wall approaches the tunnel T2, the lower side than the horizontal plane C L passing through the center of the main tunnel T1, forming a thirteenth small section tunnel t13 (Outward digging step S1).

  When the thirteenth tunnel t13 reaches the tip 11 of the large cross-section underground space 1, the No. 4 machine is offset to the outside of the closed ring cross-section 2, and then the ground (tip U) on the back side (outside of the tip) of the large cross-section underground space 1 In the turn area 4), the No. 4 machine is U-turned to form a U-shaped tunnel connecting the thirteenth small section tunnel t13 and the eighteenth small section tunnel t18 (tip digging step S2). Unit 4 excavates with an upward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

  When the No. 4 machine is made a U-turn, the center of the No. 4 machine is positioned on the center line of the closed cross section 2 and then an 18th small section tunnel t18 is formed (return excavation step S3).

  When the 18th small cross section tunnel t18 reaches the base end 12 of the large cross section underground space, the No. 4 machine is offset to the outside of the closed cross section 2 and then the front side of the large cross section underground space 1 (the outside of the base end 12). ) In the ground (base U-turn region 5), U-turns No. 4 to form a U-shaped tunnel connecting the 18th small cross section tunnel t18 and the 12th small cross section tunnel t12 (base end excavation process) S4). Unit 4 excavates with a downward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

  When Unit 4 is U-turned, Unit 4 is brought close to the thirteenth small section tunnel t13, and the center of Unit 4 is positioned on the center line of the closed ring section 2, and then at the position adjacent to the thirteenth small section tunnel t13. The twelfth tunnel t12 is formed while cutting a part of the thirteenth small section tunnel (outward digging step S1).

  When the twelfth tunnel t12 reaches the tip 11 of the large cross-section underground space 1, the No. 4 machine is offset to the outside of the closed ring cross-section 2, and then the underground (outside of the tip 11) of the large cross-section underground space 1 In the tip U-turn region 4), the No. 4 machine is U-turned to form a U-shaped tunnel that connects the twelfth small section tunnel t12 and the nineteenth small section tunnel t19 (tip digging step S2). Unit 4 excavates with an upward slope and makes a U-turn with a radius greater than the minimum bending radius of the small section tunnel.

When Unit 4 is U-turned, Unit 4 is brought closer to the 18th small cross section tunnel t18, the center of the 4th unit is positioned on the center line of the closed ring cross section 2, and then at the position adjacent to the 18th small cross section tunnel t18. A nineteenth tunnel t19 is formed while cutting a part of the 18th small-section tunnel t18 (return digging step S3).
And when the excavation of the 19th tunnel t19 reaches the base end 12 of the large cross-section underground space 1, the No. 4 machine is recovered or left in the ground.

  As shown in FIG. 4A, the U-turn route t13 → t18 and t12 → t19 of Unit 4 overlap in a cross-sectional view. Therefore, the U-turn routes t13 → t18 and t12 → t19 are U-turned at positions separated from each other.

Similarly, the lower horizontal plane C L, the Unit 5 14 small section tunnel t14, eighth small section tunnel t8, 15 small cross-section tunnels t15, forming a ninth small section tunnel t9.

5 Unit, as shown in (b) of FIG. 5, approach starts excavation from the wall surface of the tunnel T2, the lower side than the horizontal plane C L passing through the center of the main tunnel T1, 14 small cross-section tunnels t14, the The eighth small-section tunnel t8, the fifteenth small-section tunnel t15, and the ninth small-section tunnel t9 are formed in this order.
When the excavation of the ninth small section tunnel t9 reaches the base end 12 of the large section underground space 1, the No. 5 machine is recovered or left in the ground.

  As shown in FIGS. 4A and 4B, the U-turn route of Unit 5 (t14 → t8, t15 → t9 in FIG. 4A, t8 → t15 in FIG. 4B) is It overlaps with the U-turn route of Unit 4 (t13 → t18, t12 → t19 in FIG. 4A, t18 → t12 in FIG. 4B) in cross-sectional view. Therefore, Unit 5 makes a U-turn at a position farther from both ends 11 and 12 of the large cross-section underground space 1 than the U-turn route of Unit 4.

  Moreover, as shown to (a) of FIG. 4, U turn route t14-> t8 and t15-> t9 of No. 5 overlap in sectional view. Therefore, the U-turn routes t14 → t8 and t15 → t9 are U-turned at positions separated from each other.

Similarly, the lower horizontal plane C L, 11 small cross-section tunnels t11 by Unit 6, 16 small cross-section tunnels t16, 10 small cross-section tunnels t10, forming the first 17 small section tunnel t17.

Unit 6, as shown in FIG. 5 (b), approaches the tunnel wall from the start the excavation of T2, the lower side than the horizontal plane C L passing through the center of the main tunnel T1, 11 small cross-section tunnels t11, the The 16th small-section tunnel t16, the 10th small-section tunnel t10, and the 17th small-section tunnel t17 are formed in this order.
When the excavation of the seventeenth small section tunnel t17 reaches the base end 12 of the large section underground space 1, the No. 6 machine is recovered or left in the ground.

  As shown in FIGS. 4A and 4B, the U-turn route of Unit 6 (t11 → t16, t10 → t17 in FIG. 4A, t16 → t10 in FIG. 4B) is 4 and 5 U-turn routes (t13 → t18, t12 → t19, t14 → t8, t15 → t9 in FIG. 4A, t18 → t12, t8 → t15 in FIG. 4B) and cross sections Overlapping in sight. Therefore, Unit 6 makes a U-turn at a position farther from both ends 11 and 12 of the large section underground space 1 than the U-turn route of Units 4 and 5.

  Moreover, as shown to (a) of FIG. 4, U turn route t11-> t16 and t10-> t17 of No. 5 overlap in sectional view. Therefore, the U-turn routes t11 → t16 and t10 → t17 are U-turned at positions separated from each other.

  According to the underground space construction method of the present embodiment, it is possible to construct a large-section underground space such as a branching / merging portion of a tunnel by non-open cutting. For this reason, it is possible to reduce the labor and cost required for securing the site in the ground. Moreover, even in a deep tunnel, it is possible to construct a branching / merging part.

  Since the small-section tunnels t1 to t25 are formed so as not to interfere with the main tunnel T1, they can be constructed around the existing main tunnel T1.

  Moreover, since the small section tunnels t1 to t25 are divided into the upper half and the lower half of the large section underground space 1, the inclination when turning the small section tunnels t1 to 25 (when making a U-turn) is about 45 °. The following can be suppressed. For this reason, it is relatively easy to move inside and convey materials.

  By reciprocating the excavating machine a plurality of times and continuously constructing a small-section tunnel, it is possible to save labor and cost required for setup change and the like.

  Since the small section tunnel is arranged so that the excavator can be U-turned with a radius equal to or larger than the minimum bending radius of the small section tunnel, the workability is excellent.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

  For example, although the case where the large-section underground space 1 is formed in a state including the existing main line tunnel T1 has been described in the above embodiment, the main line tunnel T1 may be formed by post-construction. Even when the main tunnel T1 is constructed by post-construction, the small section tunnel is constructed so as not to interfere with the main tunnel T1, so it is necessary to cut the small section tunnel when constructing the main tunnel T1. Absent.

In the above embodiment, a plurality of small cross-sectional tunnels are arranged in a circular shape in a sectional view, but the arrangement of the small cross-sectional tunnels is not limited.
Moreover, the construction order of a small cross-section tunnel is not limited.

  The large section underground space 1 does not necessarily need to include two tunnels, the main tunnel T1 and the approach tunnel T2. Only the main tunnel T1 may be included, or three or more tunnels may be included as necessary.

  The forward small cross-section tunnel and the return small cross-section tunnel formed by the same excavator may be formed in parallel.

Moreover, when making a U-turn of the excavator, the excavator does not necessarily need to cross the vertical plane CV passing through the center of the large cross-section underground space 1.
Moreover, the shield machine, when a U-turn, may be across the horizontal plane C L passing through the center of the large section underground 1.

In the above embodiment has set the excavation route excavator and below the horizontal plane C L passing through the center of the large section underground 1, excavator is the vertical plane C V passing through the center of the large section underground 1 You may set the excavation route on the left and right.

  You may shorten a movement distance by forming a connection port between adjacent small cross-section tunnels, and connecting each other. By carrying out like this, collection | recovery of an excavation machine and conveyance of each material can be performed easily. In particular, between the small-section tunnels formed by the same excavator (if the first machine, between the first small-section tunnel t1 and the second small-section tunnel t2, or between the twentieth small-section tunnel t20 and the twenty-first small-section tunnel). If it is communicated with t21), materials such as segments assembled by the excavator can be efficiently transported.

  In the above-described embodiment, all the excavators are started from the base end 12 side of the large cross-section underground space 1, but the excavator may be started from both the base end 12 side and the tip end 11 side. Moreover, when the main tunnel is excavated ahead, you may start from the main tunnel.

1 Large section underground space 11 Tip 12 Base 2 Ring closed section 3 Region T1 Main tunnel t1 to t25 Small section tunnel

Claims (5)

  1. Before or after the construction of the main tunnel, a plurality of small cross-sectional tunnels along the axial direction of the main tunnel are arranged side by side, and the main tunnel is included in a region surrounded by the plurality of small cross-section tunnels. Is an underground space construction method that forms a large section underground space by excavating
    A forward excavation step of excavating a small-section tunnel excavator from the base end of the large cross-section underground space toward the tip;
    A tip excavation step of U-turning the excavator in the ground outside the cross section of the main tunnel on the tip side of the large section underground space;
    And a return path excavation step of excavating the excavator from the distal end toward the proximal end.
  2. In the tip excavation step, the altitude of the small section tunnel formed by the return path excavation step is excavated in an inclined state so as to be different from the altitude of the small section tunnel formed by the forward path excavation step,
    If the forward excavation process is performed above the horizontal plane passing through the center of the large cross-section underground space, the backward excavation process is performed above the horizontal plane,
    The underground space construction method according to claim 1, wherein when a forward excavation step is performed below the horizontal plane, a return excavation step is performed below the horizontal plane.
  3. After the return path excavation step, further comprising a proximal excavation step of making the excavator U-turn in the ground outside the cross section of the main tunnel on the proximal end side of the large section underground space,
    The construction method of the underground space according to claim 1 or 2, wherein the forward excavation step is performed again after the proximal excavation step.
  4.   4. The underground space construction method according to claim 1, wherein in the tip excavation step, the excavator crosses a vertical plane passing through a center of the large cross-section underground space. 5.
  5.   In the tip excavation process and the proximal excavation process, the distance between the center of the small section tunnel at the start of the U-turn by the excavator and the center of the small section tunnel at the end of the U-turn is the minimum bending radius of the small section tunnel. The underground space construction method according to any one of claims 1 to 4, wherein the underground space construction method is at least twice as large as the above.
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JP6092359B1 (en) * 2015-12-08 2017-03-08 大成建設株式会社 Large section lining body and large section tunnel construction method
JP2017096035A (en) * 2015-11-27 2017-06-01 大成建設株式会社 Material- and equipment-feeding device
JP2017096097A (en) * 2017-02-02 2017-06-01 大成建設株式会社 Material- and equipment-feeding device

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JPH04194200A (en) * 1990-11-26 1992-07-14 Mitsui Constr Co Ltd Construction method of underground hollow
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JP2017096035A (en) * 2015-11-27 2017-06-01 大成建設株式会社 Material- and equipment-feeding device
JP6092359B1 (en) * 2015-12-08 2017-03-08 大成建設株式会社 Large section lining body and large section tunnel construction method
JP2017096097A (en) * 2017-02-02 2017-06-01 大成建設株式会社 Material- and equipment-feeding device

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