KR101187876B1 - 2-Arch Tunnel with Extension Tunnel and Method for Constructing The Same - Google Patents

Abstract

Disclosed are a two-arch tunnel having an extended tunnel portion extended outward of the main ship tunnel and a construction method thereof. The two-arch tunnel having an extended main tunnel according to the present invention has a main support wall and a main two having a pair of two-arch main tunnels provided on both sides of the central support wall and forming a continuous surface with the central support wall. An extension main tunnel provided on the outside of the tunnel portion and the second arch main tunnel to form a continuous surface with the second arch main tunnel and an outer side of the separation support wall to form a continuous surface with the separation support wall; It is configured to include an extension tunnel having a.

Tunnel, arch, 2 arch tunnel, construction, support wall, glass

Description

2-Arch Tunnel with Extension Tunnel and Method for Constructing The Same}

The present invention relates to a two-arch tunnel and a construction method thereof, and more particularly, to a two-arch tunnel and a construction method thereof having an extended tunnel portion extending outside the two-arch main tunnel.

The demand for the construction of tunnels is increasing rapidly for the efficient use of narrow land and social infrastructure. The construction of these tunnels is essential for safe and environmentally friendly road construction by preventing mountain cuts and road curvature.

In general, a tunnel is divided into a mountain tunnel for forming a road or a railroad that passes through a hillside, and a city tunnel formed in the underground of an urban area. Tunnels, especially those used in mountain tunnels, include parallel tunnels, two-arch tunnels, and large section tunnels, depending on their type.

The two-arch tunnel is a tunnel having two arched tunnels on both sides of the central support wall, and refers to a tunnel in which a vehicle can be operated by the two arched main tunnels. Therefore, there was no separation distance between tunnels, which resulted in an excellent aspect of space efficiency.

However, tunnels that are connected to many roads often have at least two tunnels installed side by side. These parallel tunnels should be constructed with minimum separation distance between tunnels in consideration of stability during excavation and after construction.

This is because the tunnel inlet is composed of rocks close to the weathered rock, which results in poor stability. For reference, at the Korea Highway Corporation Road Design Standard Tunnel, the minimum separation distance between tunnels is based on 2-3 times the excavation width.

Such a parallel tunnel has a lot of problems when the paper purchase and installation of adjacent structures (bridges and intersections, etc.) for the separation distance installation.

Moreover, due to the recent environmental aspects, the road for bicycles is expanding while encouraging the use of bicycles.

However, in the case of separately partitioning the bicycle-only road in the tunnel, there is a problem that the road congestion increases.

The present invention is to solve the above-mentioned problems, the object of the present invention serves as a sidewalk or bicycle path that can be passed by people because the expansion main tunnel is further extended to the outside of the two arch main tunnel It is to provide a two-arch tunnel having an expansion tunnel portion provided with a separate tunnel capable of.

Another object of the present invention is to provide a method for constructing a two-arch tunnel having an extension tunnel according to the present invention.

In order to achieve the above object, according to an embodiment of the present invention, a pair of two arches provided on both the left and right sides of the central support wall and the upper portion of the central support wall to form a continuous surface with the central support wall A main tunnel portion having a main tunnel and a separating support wall which forms a continuous surface with the second arch main tunnel at an outer side of the 2-arch main tunnel, and an outer surface of the separating support wall that is provided outwardly. It provides a two-arch tunnel having an extension tunnel configured to include an extension tunnel having an extension main tunnel to form.

Herein, the extension main tunnel of the extension tunnel may have a height from the bottom to the top end lower than the two arch main tunnel of the main tunnel.

The expansion tunnel part according to the present embodiment may be provided in pairs on both left and right sides of the main tunnel part.

The separating support wall according to the present embodiment is provided with a plurality of assemblies along a traveling direction of the two-arch main tunnel and the extended main tunnel, and the two-arch main tunnel and the extended main tunnel communicate with each other. It may be provided with a plurality of openings.

Here, the opening may be provided with a blocking plate of a transparent material.

In addition, at least one assembly surface of the plurality of assembly of the separation support wall may further comprise a drainage hole penetrating through the opening from the top to the bottom surface.

The separating support wall according to the present embodiment may be asymmetrically biased in a direction in which the central support wall is provided at the center of the extended main tunnel.

Construction method of a two-arch tunnel having an extension tunnel according to an embodiment of the present invention excavates an expansion pilot tunnel spaced a predetermined distance in at least one of the left and right sides around the main pilot tunnel and the main pilot tunnel in the center. A pilot tunnel excavation step, a support wall installation step of installing a central support wall and a separating support wall at the center of each of the main pilot tunnel and the extended pilot tunnel, the left and right sides of the central support wall installed in the main pilot tunnel; Digging a pair of two arch main tunnels to form a continuous surface with a central support wall; and digging an extended main tunnel to form a continuous surface with the separation support wall outside the separation support wall installed in the extension pilot tunnel. It may comprise a step.

Here, in the excavation of the extended main tunnel, the excavation can be carried out lower than the two arch main tunnel formed through the excavation of the pair of two arch main tunnels.

In the pilot tunnel excavation step according to the present embodiment, the expansion pilot tunnel is excavated to be spaced a predetermined distance to the left and right sides with respect to the main pilot tunnel to install a separate support wall in the support wall installation step, respectively, excavating the expansion main tunnel In a step may be excavated a pair of expansion main tunnel on the left and right sides of the pair of two arch main tunnel.

According to another embodiment of the present invention, a two-arch tunnel construction method having an extension tunnel unit includes excavating an extended pilot tunnel spaced a predetermined distance in at least one of left and right sides about a main pilot tunnel and the main pilot tunnel at the center thereof. A pilot support tunnel excavation step, a central support wall installation step for installing a central support wall in the center of the main pilot tunnel, an asymmetric support wall for installing an asymmetric support wall in a direction in which the central support wall is installed in the center of the extended pilot tunnel And a step of excavating a pair of two arch main tunnels to form a continuous surface with the central support wall at both the left and right sides of the top of the central support wall installed in the main pilot tunnel.

The two-arch tunnel having an extension tunnel according to the present invention having the above configuration and a construction method thereof have the following effects.

First, since a separate expansion main tunnel is provided outside the 2 arch main tunnel, there is an advantage that it can be used as a road for exclusive use of a sidewalk or a bicycle that a person can pass through the expansion tunnel.

Secondly, an opening is formed in which the separating support walls provided between the two-arch main tunnel and the extended main tunnel are in communication with each other, and the opening of the extended main tunnel is made wider by providing a blocking plate or a window frame made of a transparent material in the opening. In addition, the exhaust gas emitted from the vehicle passing through the 2-arch main tunnel is prevented from flowing into the extended main tunnel, thereby maintaining a pleasant environment.

Third, since the height of the extended main tunnel is provided lower than that of the two arch main tunnel, the loosening load on the central support wall of the two arch main tunnel is minimized.

Fourth, there is an advantage that the drainage hole is further provided in the at least one assembly surface of the plurality of assemblies of the separation support wall through the opening to the bottom surface through the opening can be smoothly drained.

Fifth, when the separation support wall is formed as an asymmetric support wall, a part of the expansion pilot tunnel that is excavated to construct the expansion tunnel portion can be used as the expansion main tunnel, thereby reducing the process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

First, referring to Figures 1 to 3, the configuration of the two-arch tunnel having an extension tunnel according to the present invention will be described. 1 is a cross-sectional view of a two arch tunnel having an extension tunnel according to an embodiment of the present invention, Figure 2 is a state diagram showing a part of the separation support wall of Figure 1, Figure 3 is an opening of the separation support wall of Figure 2 It is a state diagram which shows.

As shown in FIG. 1, a two-arch tunnel having an expansion tunnel according to an embodiment of the present invention is largely divided into a main tunnel portion having a central support wall 120 and two arch main tunnels 220 and 240 and separated support. It includes an extension tunnel having a wall (140, 160) and the extension main tunnel (320, 340).

Here, the central support wall 120 is provided along the longitudinal direction of the main pilot tunnel 20, and is installed to be located at the center of the main pilot tunnel 20, so that the two arch main tunnels 220 and 240 are provided. It prevents the collapse and at the same time plays the role of a central separator of the two arch main tunnel (220, 240).

That is, when supporting the main pilot tunnel 20, the central support wall 120 primarily prevents the collapse of the ground in response to the stress and axial force applied from the top end direction of the main pilot tunnel 20. It will play a role.

A main crown 22 is installed between the central support wall 120 and the top end portion 24 of the main pilot tunnel 20.

In addition, the central support wall 120 forms a continuous surface with the 2 arch main tunnels 220 and 240, and the lining concrete 226 and 246 of the 2 arch main tunnels 220 and 240 extends to the bottom. It is formed to be.

The two arch main tunnels 220 and 240 according to the present exemplary embodiment are arched to the left and right sides around the center support wall 120 in the state where the center support wall 120 is installed after the main pilot tunnel 20 is excavated. Excavated into shape.

The bottom portions 222 and 242 of the 2 arch main tunnels 220 and 240 are paved with concrete to facilitate the movement of the vehicle, and the lining concrete is formed on the inner surface of the arch of the 2 arch main tunnels 220 and 240. 226, 246 are poured.

The separating support walls 140 and 160 according to the present exemplary embodiment are provided along the lengthwise direction of the extended pilot tunnels 40 and 60, and are installed to be located at the center of the extended pilot tunnels 40 and 60. While preventing the main ship tunnels 320 and 340 from collapsing, the main ship tunnels 320 and 340 serve as separators of the extended main ship tunnels 320 and 340.

That is, the separation support walls 140 and 160 are disposed between the separation support walls 140 and 160 and the top ends 44 and 64 of the extended pilot tunnels 40 and 60 similarly to the central support wall 120. The expansion crowns 42 and 62 are installed to support the expansion pilot tunnels 40 and 60 to cope with stresses and axial forces applied from the top ends 44 and 64 of the expansion pilot tunnels 40 and 60, respectively. The primary role is to prevent the collapse of the ground.

As shown in FIGS. 2 and 3, the separating support walls 140 and 160 are provided along the traveling directions of the two arch main tunnels 220 and 240 and the extended main tunnels 320 and 340. A plurality of openings 142 are provided to allow the arch main tunnel 220 and 240 and the extended main tunnel 320 and 340 to communicate with each other.

Here, the plurality of openings 142 is provided with a blocking plate 144 of a transparent material. In this embodiment, the blocking plate 144 may be made of a transparent glass material.

On the other hand, by providing a window frame, such as a chassis in the opening 142 may be provided with a transparent glass window in the opening 142.

2 and 3, the separation support wall 140 according to the present embodiment has a plurality of secondary arch main tunnel tunnels 220 and 240 and expansion main tunnels 320 and 340 along the advancing direction. It can be provided with two assemblies. Here, the opening 142 is provided between the plurality of assemblies.

In addition, at least one assembly surface of the plurality of assemblies of the separation support wall 140 is provided with drainage holes 146a, 146, b penetrating from the top to the bottom surface through the opening 142. Here, the drain holes 146a and 146b serve to guide the water flowing through the upper surface of the separation support wall 140 to the bottom surface by bypassing the blocking plate 144 formed in the opening 142. In charge.

In this embodiment, the shape of the upper end of the opening 142 is an example, but is not limited thereto, and the water may bypass the blocking plate 144 through the drain holes 146a and 146b. All shapes are possible with decreasing cross-sectional area towards the top.

In addition, as illustrated in FIGS. 2 and 3, the drain holes 146a and 146b are formed to bypass the blocking plate 144 to be discharged to the bottom surface in the present embodiment, but is not limited thereto. Instead, the opening 142 may be formed to the bottom surface such that the blocking plate 144 may be provided from the bottom surface, and the drain holes 146a and 146b may have various shapes.

Shapes of the separation support walls 140 and 160 are substantially the same as the center support wall 120, and thus detailed description thereof will be omitted.

The extended main tunnels 320 and 340 according to the present embodiment are provided outwardly from the separation support walls 140 and 160 and are excavated in an arch shape to form a continuous surface with the separation support walls 140 and 160. .

As shown in FIG. 1, the extended main tunnels 320 and 340 are provided to be symmetrical to both left and right sides of the two arch main tunnels 220 and 240 to form an up and down line.

The two arch main tunnels 220 and 240 according to the present embodiment are generally used as a four lane tunnel mainly used by vehicles, and the extended main tunnels 320 and 340 are similar to the two arch main tunnels 220 and 240. It can be used by vehicles, but it is more efficient to use as a road where people can pass or as a bicycle path.

As described above, the extension main tunnels 320 and 340 which are used as a sidewalk or a bicycle lane are not symmetrically formed on both left and right sides of the two arch main tunnels 220 and 240. It is also possible to partition the lanes inside the extended main tunnels 320 and 340 provided on one side of the two arch main tunnels 220 and 240 alone.

In order to minimize the loosening load applied to the central support wall of the 2-arch main tunnel, the overall main shape of the 2-arch tunnel having the extended tunnel part is closer to the arc shape. The height L2 from the bottom portions 322 and 342 of the 320 and 340 to the top ends 324 and 344 of the extended main tunnels 320 and 340 is the bottom portion of the two arch main tunnels 220 and 240. It is preferable to form lower than the height (L1) from (222, 242) to the top ends (224, 244) of the two arch main tunnel (220, 240).

Next, a two-arch tunnel having an extension tunnel according to another embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is a cross-sectional view of a two arch tunnel having an expansion tunnel according to another embodiment of the present invention, and FIG. 5 is a state diagram showing a state in which the separated support wall of FIG. 4 is constructed of an asymmetric support wall.

The two-arch tunnel having the expansion tunnel according to the present embodiment has a structure similar to that of the above-described embodiment, and therefore, the same parts as those of the above-described embodiment will be omitted and the parts showing the difference will be described in detail.

According to the present embodiment, the extended main tunnels 360 and 380 use the extended pilot tunnels 30 and 50. That is, after digging the expansion pilot tunnels 30 and 50, the separation support walls 130 and 150 supporting the expansion pilot tunnels 30 and 50 are moved from the center of the expansion pilot tunnels 30 and 50. It is installed as an asymmetric support wall (130, 150) to be biased in the direction of the center support wall (120).

Accordingly, the extended pilot tunnels 30 and 50 are pilot tunnels 30a and the extended main tunnel, which are used as the second arch main tunnels 220 and 240 lastly due to the asymmetric support walls 130 and 150. It is divided into the main ship tunnel portion 30b used as (360, 380).

Therefore, when the main pilot tunnel portion 30b replaces the extended main tunnels 360 and 380, when excavating the extended pilot tunnels 30 and 60, as in the above-described embodiment, the second arch main tunnel ( The expansion main line is excavated to a height L2 lower than the height L1 from the bottom portions 222 and 242 of the 220 and 240 to the top ends 224 and 244 of the two arch main tunnels 220 and 240. The tunnels 360 and 370 are determined by the height L2 from the bottom portions 362 and 382 of the extended main tunnels 360 and 380 to the top ends 364 and 384 of the extended main tunnels 360 and 360. do.

Expansion crowns 32 and 52 are installed between the asymmetric support walls 130 and 150 and the top ends 34 and 54 of the extended pilot tunnels 30 and 30 according to the present embodiment. 130 and 150 are connected to top ends 34 and 54 of the extended pilot tunnels 30 and 50 at bottoms 362 and 382 of the extended main tunnels 360 and 380, respectively. 50) and the extension main tunnel 360, 380.

As shown in FIG. 5, while the expansion pilot tunnel 30 is excavated and the asymmetric support wall 130 is installed, the expansion pilot tunnel 30 is continuously excavated along the longitudinal direction. There is an effect that can smoothly supply the equipment used for the excavation of the expansion pilot tunnel 30 through the main ship tunnel portion 30b. That is, the main tunnel portion 30b is to play a role as the equipment movement path.

Finally, each construction method according to various embodiments of the present invention will be described with reference to FIGS. 6 and 7 as follows. 6 is a flow chart showing a construction method of a two-arch tunnel having an extension tunnel according to an embodiment of the present invention, Figure 7 is a construction method of a two-arch tunnel having an extension tunnel according to another embodiment of the present invention It is a flow chart showing.

Construction method of the two-arch tunnel having an extension tunnel according to an embodiment of the present invention is the pilot tunnel excavation step (S1), the support wall installation step (S3), excavating a pair of two arch main tunnel (S5) and It is configured to include a step (S8) for excavating the expansion main tunnel.

Here, the process of excavating the main pilot tunnel 20 and the extended pilot tunnel (40, 60) in the pilot tunnel excavation step (S1) is as follows.

First, survey the construction environment to be excavated, and then check whether the fabric factory and the interval are appropriate by the blasting pattern using rock drilling equipment equipped with several rock drills such as 3BOOM JUMBODRILL or leg hammer. To drill the blast hole.

Next, check the appropriate amount of the charge in the blast hole to charge the gunpowder, and to carry out blasting. Then, after the blasting, ventilation is carried out, and during the ventilation process, confirmation of the unfixed medicine and the secondary collapse due to vibration, and for safety, the fall and pumice treatment using a payloader, charging car, service car, etc. And the rockfall treatment generated due to the blasting.

Next, the bagging process is carried out using a loading machine such as a wheel loader and a dump truck, and a conveying machine. Next, use the robotic equipment for wet shotcrete placement or the robotic shockcrete machine and mixer truck (reconcrete) to perform the primary shockcrete, and use equipment such as hydraulic self-propelled work vehicles and wire mesh or rock bolts. After the same support material is installed, the second shockcrete work is carried out similarly to the first shockcrete work.

By repeating the above steps, the construction of the main pilot tunnel 20 proceeds, and the above steps are repeated at a distance spaced a predetermined distance from both the left and right sides of the main pilot tunnel 20 to extend the pilot tunnels 40 and 60. Excavate).

When the main pilot tunnel 20 and the extended pilot tunnel (40, 60) is excavated by the blasting shock, the central ground wall 120 and the separated support to be provided in the main pilot tunnel 20 and the extended pilot tunnel (40, 60) After checking whether the walls 140 and 160 have been excavated to a distance that is not broken or dislodged, the main pilot tunnel 20 and the expansion pilot may be up to a sufficient distance if a sufficient distance to escape the blasting shock is not secured. Further tunnels 40 and 60 will be excavated.

As such, when the support wall is installed through the step S2 of checking whether the central support wall 120 and the separation support walls 140 and 160 are excavated to a safe separation distance that is not damaged or separated, the main pilot tunnel is possible. 20 and the support wall installation step (S3) of installing the central support wall 120 and the separation support walls 140 and 160 in the center of each of the extension pilot tunnels 40 and 60, and cures.

In general, the safety separation distance is generally calculated as 50M or more, but is not necessarily limited thereto, and various modifications and modifications may be made within the scope of the construction site environment and safety management standards.

Next, if the curing is not made through the step (S4) to determine whether the central support wall 120 and the separation support wall (140, 160) is cured enough to not be damaged by the impact, such as blasting when excavating the main tunnel After the curing is more time, and after curing is completed to form a continuous surface with the central support wall 120 from the upper side of the central support wall 120 to the left and right sides around the center support wall 120. In order to excavate a pair of two arch main tunnel (S5) to proceed.

In the process of excavating the pair of two arch main tunnels 220 and 240, placing lining concrete over the entire arch surface of the two arch main tunnels 220 and 240 (S6) and the second arch main tunnel. The second arch main tunnels 220 and 240 are completed through the step S7 of placing the pavement concrete on the bottom portions 222 and 242 of the 220 and 240.

Next, in the step of excavating the expansion main tunnel (S8) when the curing of the separation support wall (140, 160) is completed, the expansion main tunnel (320, 340) to the center of the separation support wall (140, 160) As a result, the expanded main tunnels 320 and 340 are excavated to form a continuous surface with the separation support walls 140 and 160 from both sides of the separation support walls 140 and 160.

At this time, the expansion main tunnel 320, 340 is excavated to a lower height (L2) than the height (L1) of the two arch main tunnel (220, 240). Detailed description accordingly will be replaced by the above description.

As such, when the expansion main tunnels 320 and 340 are excavated, placing lining concrete over the entire arch surface of the expansion main tunnels 320 and 340 (S9) and the expansion main tunnels 320 and 340. The expansion main tunnel (320, 340) is completed through the step (S10) of placing the pavement concrete on the bottom portion (322, 324).

In the present embodiment, the extended main tunnels 320 and 340 are formed to be symmetrical to both left and right sides of the two arch main tunnels 220 and 240 as described above.

Through the steps as described above, a two-arch tunnel having an extended tunnel part according to an embodiment of the present invention is finally completed.

The construction method of the two-arch tunnel having the expansion tunnel according to another embodiment of the present invention is made similarly to the above-described embodiment. Here, only the differences from the above-described embodiment will be described in detail.

The construction method of the two-arch tunnel having the expansion tunnel according to the present embodiment is large, pilot tunnel excavation step (S11), central support wall installation step (S13), asymmetric support wall installation step (S14) and a pair of two arch main ship And excavating the tunnel (S16).

Here, in the pilot tunnel excavation step (S11), the expansion pilot tunnel 30, which is spaced a predetermined distance in at least one of the left and right sides of the main pilot tunnel 20 and the main pilot tunnel 20 at the center thereof, Excavation 50). Detailed description thereof will be omitted.

The height L2 of the extended pilot tunnels 30 and 50 may be lower than the height L1 of the two arch main tunnels 220 and 240.

The central support wall 120 to be provided in the main pilot tunnel 20 and the extended pilot tunnel (30, 50) and separation by the blasting impact when the main pilot tunnel 20 and the extended pilot tunnel (30, 50) excavation The main pilot tunnel 20 when a sufficient distance to escape the blasting shock is secured through the step (S12) of determining whether or not the support wall 130, 150 has been excavated to a distance that is not broken or separated. The central support wall installation step (S13) for installing the central support wall 120 in the center and proceeds to cure.

Next, the asymmetric support wall installation step (S14) of installing the asymmetric support walls 130 and 150 in a direction in which the center support wall 120 is installed in the center of the extended pilot tunnels 30 and 50 is performed. And cure.

Here, the step (S11) of installing the main pilot tunnel 20 and the step (S13) of installing the central support wall 120 through the step (S12) of determining whether the support wall can be installed is a constant time difference. It will go on at the same time.

Similarly, the step of excavating the expansion pilot tunnel (30, 50) (S11) and the step of installing the asymmetric support wall (S14) also proceeds at the same time at a predetermined distance through the support wall installation determination step (S12) do.

Here, by providing the asymmetric support wall (S14) through the installation of the asymmetric support wall (130, 150) by providing a moving passage of the equipment used for the excavation of the expansion pilot tunnel (30, 50) Construction period can be shortened.

Next, after the curing is completed through the step (S15) to determine whether the central support wall 120 and the asymmetric support walls (130, 150) are not cured by impacts such as blasting when the main tunnel is excavated (S15) Excavating a pair of two arch main tunnels to form a continuous surface with the central support wall 120 from both the left and right sides of the center support wall 120 with the center support wall 120 as the center (S16). Proceed.

In the process of excavating the pair of two arch main tunnels 220 and 240, placing lining concrete over the entire arch surface of the two arch main tunnels 220 and 240 (S17) and the second arch main tunnel ( The second arch main tunnels 220 and 240 are completed through the step S18 of placing the pavement concrete on the bottom portions 222 and 242 of the 220 and 240.

Subsequently, the main tunnel section 30b of the extended pilot tunnels 30 and 50 is replaced with the extended main tunnels 360 and 380 so that the lining concrete is spread over the entire arch surface of the extended main tunnels 360 and 380. The expansion main tunnel (360, 380) is completed through the step (S19) and the step (S20) of paving concrete in the bottom portion (362, 382) of the expansion main tunnel (360, 380). .

In the present embodiment, the extended main tunnels 360 and 380 are formed to be symmetrical to both the left and right sides of the two arch main tunnels 220 and 240 as described above.

Through the steps as described above, a two-arch tunnel having an extended tunnel part according to an embodiment of the present invention is finally completed.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, those skilled in the art can make modifications without departing from the spirit of the present invention, and such modifications are possible. Belongs to the scope of.

1 is a cross-sectional view of a two arch tunnel having an extension tunnel according to an embodiment of the present invention;

FIG. 2 is a state diagram showing a part of the separating support wall of FIG. 1; FIG.

3 is a state diagram showing an opening of the separating support wall of FIG. 2;

4 is a cross-sectional view of a two arch tunnel having an extension tunnel according to another embodiment of the present invention;

5 is a state diagram showing a state in which the separated support wall of Figure 4 constructed of an asymmetric support wall;

6 is a flow chart showing a construction method of a two-arch tunnel having an extension tunnel according to an embodiment of the present invention; And

7 is a flow chart showing a construction method of a two-arch tunnel having an extension tunnel according to another embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

10: bottom 12: coupling groove

20: Main Pilot Tunnel 22: Main Crown

24: Top end of main pilot tunnel 30, 40, 50, 60: Extended pilot tunnel

30a: Pilot Tunnel Section 30b: Main Tunnel Section

40, 60: expansion pilot tunnel 32, 42, 62: expansion crown

34, 44, 64: Extension pilot tunnel top end 120: center support wall

226, 246: lining concrete 126: drainage surface

130, 150: asymmetric support wall 140, 160: separate support wall

142: opening 144: blocking plate

146: drainage hole 220: 240: 2 arch main tunnel

222, 242: 2 arch main tunnel bottom 224, 244: 2 arch main tunnel

320, 340, 360, 380: Extended Main Tunnel

322, 342, 362, 382: bottom of the extended main tunnel

324, 344, 364, 384: Temple End of Extended Main Tunnel

Claims (11)

A main tunnel portion having a center support wall and a pair of two-arch main tunnels provided on both sides of the center support wall and forming a continuous surface with the center support wall; And An extension having a separation support wall that forms a continuous surface with the 2 arch main tunnel at an outer side of the 2 arch main tunnel and an extended main tunnel that is provided outward from the separation support wall to form a surface continuous with the separation support wall; Tunnel portion; / RTI &gt; The separating support wall, A plurality of assemblies are provided along a traveling direction of the two-arch main tunnel and the extended main tunnel, and an opening is provided between the plurality of assemblies to allow the two-arch main tunnel and the extended main tunnel to communicate with each other, and the opening is transparent. Two-arch tunnel with expansion tunnel part in which a frame is formed so that material blocking plate is placed. The method according to claim 1, The expansion main tunnel of the expansion tunnel portion, A two-arch tunnel having an extended tunnel portion formed from the bottom to the top end is lower than the two-arch main tunnel of the main tunnel portion. The method according to claim 1, The expansion tunnel unit, A two-arch tunnel having an extended tunnel provided in a pair on the left and right sides of the main tunnel. delete delete The method according to claim 1, And an expansion tunnel portion further including a drainage hole penetrating from an upper end to an bottom surface of the at least one assembly surface of the plurality of assemblies of the separation support wall. The method according to claim 1, The separating support wall, And a two-arch tunnel having an extended tunnel portion asymmetrically biased in a direction in which the central support wall is provided at the center of the expanded main tunnel. A pilot tunnel excavating step of digging an extended pilot tunnel spaced at a predetermined distance in at least one direction from both left and right sides of the main pilot tunnel and the main pilot tunnel at the center; A center support wall and a separation support wall, each having a plurality of assemblies formed at the center of each of the main pilot tunnel and the extended pilot tunnel, and having an opening having a frame formed therebetween so as to arrange a blocking plate of a transparent material between the plurality of assemblies. Supporting wall installation step; Excavating a pair of two arch main tunnels so as to form a continuous surface with the central support wall on both the left and right sides of the upper part of the central support wall installed in the main pilot tunnel; And Digging an expansion main tunnel to form a surface continuous with the separation support wall outside the separation support wall installed in the expansion pilot tunnel; 2 arch tunnel construction method having an extension tunnel configured to include a. The method of claim 8, Excavating the extended main tunnel, And a two-arch tunnel construction method having an extended tunnel portion for digging lower than the two-arch main tunnel formed by digging the pair of two-arch main tunnel. The method of claim 8, In the pilot tunnel excavation step, Two pairs of two arch main ships are installed in the step of excavating an extended pilot tunnel so as to be separated by a predetermined distance from the left and right sides of the main pilot tunnel, and installing a separate support wall in the step of installing the support wall and digging an extended main tunnel. A two-arch tunnel construction method having an extended tunnel portion for excavating a pair of extended main tunnels on both left and right sides of a tunnel. A pilot tunnel excavating step of digging an extended pilot tunnel spaced at a predetermined distance in at least one direction from both left and right sides of the main pilot tunnel and the main pilot tunnel at the center; A central support wall installation step of installing a central support wall at the center of the main pilot tunnel; An asymmetric support wall installation step of installing an asymmetric support wall in a direction in which the center support wall is installed in the center of the extended pilot tunnel; And Excavating a pair of two arch main tunnels so as to form a continuous surface with the central support wall on both the left and right sides of the upper part of the central support wall installed in the main pilot tunnel; / RTI &gt; The center support wall and the asymmetric support wall is composed of a plurality of assemblies, a two-arch tunnel construction method having an expansion tunnel portion is formed with an opening is formed so that the frame is disposed between the plurality of assemblies a transparent blocking plate.

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