KR100689968B1 - 2-arch tunnel and method for constructing the same - Google Patents

Abstract

A 2-arch tunnel is provided to improve the strength and durability by coupling an upper reinforcement member and a lower reinforcement member and reinforcing a central bearing wall integrally, to prevent the accident and problem caused by an inflow of effluents by installing a waterproof plate on a lower bearing wall and improving waterproofing efficiency, and to make maintenance easy by forming a vertical drainpipe to be separable from the central bearing wall and washing or replacing the vertical drainpipe easily. The 2-arch tunnel contains a pilot tunnel, a central bearing wall(100) and a pair of main tunnels. The central bearing wall comprises: a lower bearing wall(150) formed on the central lower part of the pilot tunnel and composed of a column(130) installed in the pilot tunnel to have a fixed curved surface and buried with lower reinforcement members(157) to reinforce the structure of the lower bearing wall and one or more vertical drainpipes(155) to drain off effluents toward the lower part of the pilot tunnel, a lining connection(140) formed on both upper ends of the column and projected at the fixed angle to resist the compressive force of lining concrete(9), a base(110) installed on the bottom of the column to support the column together with a medium strip and equipped with a drainage way(115) to discharge water from the vertical drainpipe to the outside of a tunnel, and a medium strip(120) installed on the lower part of the column to support the column; an upper bearing wall(160) installed between the lower bearing wall and the crown(10a) of the pilot tunnel and provided with supporters(163) installed at regular intervals in the longitudinal direction of the tunnel and composed of a pane having a curved surface and a support frame supporting load from the lower part of the panel, and upper reinforcement members(167) installed along the arched surface of the tunnel at regular intervals and coupled with the lower reinforcement members by connection members(169) to reinforce the upper bearing wall and the lower bearing wall integrally; and a waterproof plate(170) composed of a sump retreated downward to collect upper effluents and provided with a central perforated pipe to guide the collected effluents to drainpipe connections and auxiliary perforated pipes to guide effluents more smoothly, plural drainpipe connections placed at regular intervals in the longitudinal direction of the tunnel, and plural through holes formed in the longitudinal direction of the tunnel to penetrate the lower reinforcement members.

Description

2-arch tunnel and method for constructing the same}

1 is a cross-sectional view of a conventional parallel tunnel;

2 is a cross-sectional view schematically showing a conventional two arch tunnel;

3 is a sectional view showing a central portion of a two arch tunnel according to the present invention;

4 is an enlarged cross-sectional view of a portion “A” of FIG. 3;

5 is a perspective view illustrating the waterproof plate of FIG. 3;

FIG. 6 is a cross-sectional view taken along line II of FIG. 5; FIG.

7 is a top view of FIG. 5;

8 is a cross-sectional view taken along the line II-II of FIG. 3;

9 is an enlarged cross-sectional view of a portion “B” of FIG. 8.

<Description of Symbols for Major Parts of Drawings>

10: pilot tunnel 100: center support wall

110: base 115: drainage

120: center separator 130: pillar portion

140: lining connecting portion 150: lower support wall

155: vertical drain pipe 157: lower reinforcing member

160: upper support wall 167: upper reinforcing member

169: connecting member 170: waterproof plate

171: collecting part 173: through hole

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 improved structure to improve durability and waterproof performance.

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. In recent years, environmental issues have emerged as an important issue in the tunnel construction method, especially in the construction of mountain tunnels.

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 entrance is composed of rocks close to weathering, and thus the stability of the tunnel is reduced. For reference, at the Korea Highway Corporation road design standard tunnel section, the minimum separation distance between tunnels is based on 2-3 times the excavation width.

Figure 1 shows a front view of a conventional parallel tunnel. The construction sequence of the parallel tunnel is as follows.

First, survey the part that you want to construct the tunnel and drill through drilling and blasting at the selected location. The blasting operation drills a hole for blasting in the soil or rock to be blasted, and puts an explosive into the hole to blast. After that, the soil and rock debris from blasting and digging are cleaned up and pumice is removed. After that, the shotcrete work, the rock bolt work, etc. are repeatedly performed, and the parallel tunnels 2 and 3 are completed through other auxiliary work. At this time, the separation distance L between the parallel tunnels 2 and 3 is 2 to 3 times the tunnel width d as described above.

However, the conventional parallel tunnel has the following problems.

In order to construct a parallel tunnel, a large area of road insertion site was required, which damaged much of the mountain through the tunnel. In particular, the construction of such parallel tunnels can be serious in the vicinity of water conservation areas and national parks. In addition, a pair of parallel tunnels have a considerable distance between the tunnels, so that there is a problem in connection of planar geometry with adjacent structures, that is, bridges and intersections.

In order to solve the problems in the construction of the parallel tunnel described above, a two-arch tunnel construction method has been recently used. The two-arch tunnel is a tunnel having two arcuate tunnels on both sides of the central support wall, and refers to a tunnel in which a vehicle can be operated by the two arcuate main tunnels. The two-arch tunnel can be used in a place where the construction of the parallel tunnel is difficult because there is less road incorporation paper than the parallel tunnel. The two-arch tunnel, which has advantages in terms of three-dimensional use of land use, has been commercialized for tunnel construction of more than four round trips since the 1990s.

Figure 2 shows a cross section of a conventional two arch tunnel. Hereinafter, the structure of a two-arch tunnel is demonstrated with reference to FIG.

First, the general construction method of the two-arch tunnel is as follows. After excavating the pilot tunnel 10, the central support wall 1 is installed in the center of the pilot tunnel. Then, the main tunnels 20 and 30 are excavated by blasting both left and right sides of the pilot tunnel. Thereafter, lining concrete 9 is poured over the pavement concrete 22 and 32 and the main tunnel arch surfaces 21 and 31 on each ground.

Briefly looking at the structure of the two-arch tunnel, it consists of a pilot tunnel 10, the central support wall (1) and the main tunnel (20, 30) located inside the pilot tunnel. The pilot tunnel 10 is a preliminary tunnel for excavating the main ship tunnel and provides a space for the excavation equipment or construction machinery to work.

The central support wall 1 is erected to support the tunnel at the center of the pilot tunnel 10 and to support the impact of the ground when the main tunnels 20 and 30 are excavated. The central support wall 1 consists of a base 11, a central separator 12, a pillar 13, a lining connection 14 and a crown 15 that abuts the top end 10a of the pilot tunnel.

The crown 15 and the lining connecting portion 14 are not linearly continuous, and a bent portion 14a is formed so that the reinforcing bar is reinforced to the lining connecting portion 14. At this time, by using different formwork in accordance with each structure, each time the one central support wall (1) is erected all five times the concrete pouring work is made. The central support wall is erected continuously every few meters.

On the other hand, the perforated pipe (4) is installed on the edge of the crown in order to prevent the shape of leaking to the outside of the crown 15, the drain pipe (5) is installed in the longitudinal direction inside the central support wall. Elution water flowing through the drain pipe (5) is discharged to the outside to the drain (7) provided in the base (11). In addition, the tunnel waterproof sheet 6 is installed at the top end portion 10a of the pilot tunnel to the outside of the crown.

The main tunnels 20 and 30 are formed on both left and right sides of the pilot tunnel 10 after the drainage treatment of the central support wall 1 and the pilot tunnel top end 10a is completed. The blasting work for forming the main ship tunnel is to excavate the upper end of the main ship tunnel first, and then excavate the lower end of the main ship tunnel. The main tunnels 20 and 30 are excavated in an arc shape.

However, the structure and construction method of the conventional two-arch tunnel as described above has the following problems.

First, the conventional two-arch tunnel is not made of a structure in which the ceiling portion of the central support wall and the pilot tunnel are integrally reinforced, and thus, there is a problem in that it is vulnerable to blasting impact when excavating the main tunnel, and the durability after construction is weak. That is, the central support is not integrally connected to the top end of the pilot tunnel, and the central support wall is subjected to shear stress in relation to the top end of the pilot tunnel, which is vulnerable to impact during blasting and poor after construction.

Second, the conventional two-arch tunnel may cause damage to the waterproof sheet, the perforated pipe, and the drain pipe at the top end of the pilot tunnel during the blasting process when the main ship tunnel is excavated. Loss of drainage capacity affects the durability of concrete structures, and at the same time, leachate leaked in winter freezes, which presents a serious problem that threatens the safety of automobile operation.

Third, it was difficult to maintain the drain pipe of the tunnel after construction. More specifically, it is difficult to clean or replace the drain pipe when foreign matter gets stuck or corroded due to long use after constructing the tunnel.

Fourth, the effluent flowing in the vertical drainage pipe in winter is frozen, the drainage is not smooth and there is a problem that the vertical drainage pipe bursts.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a two-arch tunnel and a construction method thereof having improved durability by improving the structure.

Another object of the present invention is to provide a two-arch tunnel and a construction method thereof that prevents safety accidents and improves durability by improving waterproof performance.

Another object of the present invention is to provide a two-arch tunnel and its construction method which is easy to maintain by improving the structure.

Still another object of the present invention is to provide a two-arch tunnel and a construction method thereof for preventing freezing of a vertical drain pipe.

In order to achieve the above object, the present invention, a pilot tunnel; A lower support wall having a lower reinforcing member reinforcing a structure embedded therein and formed at a center lower portion of the pilot tunnel; The upper reinforcing member accommodates an upper reinforcing member partially inserted into the outer side of the pilot tunnel and partially protruded into the pilot tunnel, and includes an upper supporting wall provided on an upper portion of the lower supporting wall. It is coupled to each other by a predetermined connecting member to provide a two-arch tunnel made of a structure to reinforce the lower support wall and the upper support wall integrally.

In addition, the two-arch tunnel may be further provided with at least one waterproof plate provided between the lower support wall and the upper support wall to prevent the inflow of effluent water from the lower support wall. In addition, the waterproof plate is made of a plurality, it is more preferable that both ends of the waterproof plate are mutually coupled in the longitudinal direction of the tunnel.

On the other hand, it is preferable that at least one vertical drain pipe is disposed inside the lower support wall to drain the effluent water collected at the upper portion of the waterproof plate to the lower portion of the pilot tunnel. In the waterproof plate, it is more preferable that a plurality of through holes are formed along the longitudinal direction of the tunnel. In addition, the through hole is more preferably provided with a predetermined sealing member around the portion through which the lower reinforcing member penetrates.

In addition, the lower reinforcing members are preferably arranged in a lateral direction of the pilot tunnel at a predetermined interval in the longitudinal direction of the tunnel. In addition, the through hole of the waterproof plate is more preferably formed at a position corresponding to the arrangement of the lower reinforcing member.

On the other hand, it is preferable that the through hole formed in the waterproof plate is substantially elliptical. And in the center of the waterproof plate, it is more preferable that the collecting portion recessed downward along the longitudinal direction of the tunnel.

The lower portion of the collecting portion, it is preferable that the drain pipe connecting portion connected to the vertical drain pipe is provided at predetermined intervals along the longitudinal direction of the tunnel. Further, it is more preferable that the collecting part is provided with a central hole hole along the longitudinal direction of the tunnel. In addition, it is more preferable that auxiliary left and right pipes are provided along the longitudinal direction of the tunnel to the left and right of the collecting portion.

On the other hand, the waterproof plate is preferably provided with a hole pipe fixing device for fixing the auxiliary hole pipe. The waterproof plate may be further provided with at least one drain board to allow fluid to flow from the edge of the waterproof plate to the center at predetermined intervals in the longitudinal direction of the tunnel.

In addition, the vertical drain pipe is preferably arranged in a zigzag form alternately to the left and the right along the longitudinal direction of the tunnel. In addition, the portion adjacent to the vertical drainage pipe, it is more preferably provided with a freezing prevention means for preventing the freezing of the effluent flowing through the vertical drainage pipe.

On the other hand, the vertical drain pipe is more preferably detachable from the outside can be removed from the lower support wall. Further, it is more preferable that a predetermined filling material surrounding the vertical drain pipe is provided at a portion adjacent to the vertical drain pipe.

Construction method of the two-arch tunnel according to the invention, the step of excavating a pilot tunnel; Embedding a lower reinforcing member reinforcing a structure therein to install a lower support wall formed at a center lower portion of the pilot tunnel; Installing an upper reinforcing member partially inserted into the outside of the pilot tunnel and partially protruding into the pilot tunnel; Accommodating the upper reinforcing member and installing an upper support wall provided on an upper portion of the lower support wall; In addition, the lower reinforcing member and the upper reinforcing member is preferably configured to include a step of mutually coupling by a predetermined connecting member.

The construction method may further include installing a waterproof plate provided between the lower support wall and the upper support wall to prevent the inflow of effluent water from the lower support wall.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be specifically realized are described with reference to the accompanying drawings. In the description of this embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted.

3 and 4, an embodiment of a two-arch tunnel according to the present invention will be described.

Figure 3 is a cross-sectional view showing a central portion of the two-arch tunnel according to the present invention, Figure 4 is an enlarged cross-sectional view of the portion "A" of FIG.

The two-arch tunnel according to the present embodiment basically includes a pilot tunnel 10, a central support wall 100, and a pair of main tunnels 20 and 30.

Before excavating a pair of main tunnels 20 and 30 in a two-arch tunnel, a pilot tunnel 10 having a predetermined width is first excavated and a central support wall 100 is installed. Excavation process of the pilot tunnel 10 is the same as in the prior art, so a detailed description thereof will be omitted.

The central support wall 100 of the two-arch tunnel is largely composed of a lower support wall 150 and an upper support wall 160.

The lower support wall 150 is formed at the center lower portion of the pilot tunnel 10 and is composed of a pillar part 130, a lining connection part 140, a base part 110, and a central separator 120.

The pillar portion 130 is installed while having a constant curved surface in the pilot tunnel 10. The curved surface is formed to be connected to the curve of the two arch main tunnel located on both sides of the pilot tunnel (10).

On the other hand, the lower reinforcing member 157 for reinforcing the structure of the lower support wall 150 is embedded in the pillar portion 130. The lower reinforcing member 157 is preferably disposed at a predetermined interval in the longitudinal direction of the tunnel provided in the transverse direction of the pilot tunnel 10. In this embodiment, a pair of reinforcing members provided in the transverse direction is arranged to have a predetermined interval in the longitudinal direction of the tunnel.

The material and shape of the lower reinforcing member 157 is not limited, and is generally made of rod-shaped rebar.

And the lower reinforcing member 157 is preferably made of a plurality for the convenience of construction is connected by a predetermined connection means. In the present embodiment, as shown in FIG. 3 or FIG. 4, the first lower reinforcing member 157a and the second lower reinforcing member 157b are illustrated and coupled to each other by the connecting means 159.

The connecting means 159 secures the minimum overlap length of the first lower reinforcing member 157a and the second lower reinforcing member 157b and connects them to the connecting member, or other couplers may be employed. It is also possible to combine with each other by welding.

One or more vertical drain pipes 155 are provided in the pillar part 130 to serve to drain the effluent collected in the upper portion to the lower portion of the pilot tunnel 10. The shape and arrangement of the vertical drain pipe 155 will be described later with reference to FIGS. 8 and 9.

The lining connecting part 140 is formed at both ends of the upper end of the pillar part 130 and is a part to which the central support wall 100 and the two arch main tunnel are connected. The shape of the lining connecting portion 140 is preferably formed to protrude at a predetermined angle to suit the compressive force of the lining concrete (9). And this shape serves to structurally complement the drainage of the tunnel so that the effluent flowing down along the integral waterproof membrane 91 formed in the upper support wall 160 does not flow to the outside of the central support wall (100).

The central separator 120 is installed on the lower side of the pillar portion 130, and serves to support the pillar portion 130. The shape and support method of the support structure of the central separator 120 is not limited to this embodiment.

The base 110 is installed on the bottom surface of the pillar 130, and serves to support the pillar 130 together with the central separator 120. The drainage path 115 is installed inside the base 110. The drainage path 115 is connected to the vertical drainage pipe 155 to allow the water flowing out of the vertical drainage pipe 155 to exit the tunnel.

On the other hand, the waterproof plate 170 is preferably provided between the lower support wall 150 and the upper support wall 160. The waterproof plate 170 serves to prevent the eluate from flowing into the lower support wall 150. Specific shapes and structures of the waterproof plate 170 will be described later with reference to FIGS. 5 to 7.

The upper support wall 160 is provided between the lower support wall 150 and the top end 10a of the pilot tunnel 10. The upper support wall 160 and the lower support wall 150 is preferably formed of a concrete structure. However, the upper support wall 160 and the lower support wall 150 is not limited thereto. For example, it is also possible to use a steel structure, a steel structure, and concrete in parallel.

The upper support wall 160 may be continuously installed or may be installed at predetermined intervals. In addition, the upper support wall 150 and the lower support wall 160 may integrally form the central support wall 100.

On the other hand, the upper support wall 160 is preferably provided with a supporter 163 for supporting the top end portion 10a of the tunnel at a predetermined interval in the longitudinal direction of the tunnel. The supporter 163 includes a panel 163a having a curved surface and a support frame 163b for supporting a load under the panel 163a. The panel 163a of the supporter is preferably formed to have the same curvature as that of the tunnel top end 10a for effective support.

On the other hand, the upper reinforcing member 167 is provided inside the upper support wall 160. The upper reinforcing member 167 is constructed at regular intervals over the arch surface of the tunnel after excavating the pilot tunnel 10, it is generally made of a rock bolt form.

The bolt is a bolt of several meters (meter), and serves to strengthen the cohesion of the rock on the tunnel.

In the present embodiment, the upper reinforcing member 167 of the upper reinforcing member 167 that is inserted into the top end 10a of the pilot tunnel 10 is partially inserted into the outer side of the pilot tunnel 10, and the pilot tunnel ( 10) It is made in the form of some protruding inward.

Meanwhile, as shown in FIG. 4, the upper reinforcing member 167 is coupled to each other by the lower reinforcing member 157 and the predetermined connection member 169 penetrating the waterproof plate 170, thereby providing an upper support wall ( 160 and the lower support wall 150 is integrally reinforced.

As such, the present embodiment has a structure in which the upper reinforcing member 160 and the lower reinforcing member 150 are connected to each other to reinforce the upper support wall 160 and the lower support wall 150 integrally, thereby blasting the main tunnel. It can withstand the shock sufficiently and can greatly improve the durability of the tunnel after construction.

After the installation of the central support wall 100 is completed, two arch main tunnels 310 and 320 are excavated to the left and right sides of the pilot tunnel 10. Excavation of the 2 arch main tunnel has been described in the prior art and thus will be omitted.

5 to 7, the specific shape and structure of the waterproof plate will be described as follows.

5 is a perspective view illustrating the waterproof plate of FIG. 3, FIG. 6 is a cross-sectional view taken along line II of FIG. 5, and FIG. 7 is a top view of FIG. 5.

The waterproof plate 170 is a separate unit form, it is preferable that both ends of the waterproof plate 170 in the longitudinal direction of the tunnel is made of a plurality of pieces are mutually coupled.

At the center of the waterproof plate 170, a collecting part 171 recessed downward in the longitudinal direction of the tunnel is provided, and serves to collect the effluent water from the upper portion of the waterproof plate 170. The left and right sides of the waterproof plate 170 may be bent upward in correspondence with the shape of the lining connection part 140 of the lower support wall 150.

In addition, a drain pipe connection part 172 connected to a vertical drain pipe 155 provided in the lower support wall 150 is disposed at a lower portion of the water collecting part 171 at a predetermined interval along the longitudinal direction of the tunnel.

In this embodiment, corresponding to the arrangement interval of the vertical drain pipe 155, the drain pipe connecting portion 172 is provided at a predetermined interval to illustrate the form.

The collecting part 171 is provided with a central hole hole 175a along the longitudinal direction of the tunnel. The central perforated pipe 175a allows the elution water collected in the water collecting part 171 to be smoothly guided to the drain pipe connection part 172 disposed at a predetermined interval.

Although not shown, a predetermined filling material may be provided in the empty space between the water collecting part 171 and the central hole tube 175a, and the filling material may be made of, for example, gravel.

It is preferable that auxiliary left and right pipes 175b and 175c are further provided along the longitudinal direction of the tunnel at left and right sides of the water collecting part 171.

The water collecting part 171 and the central hole pipe 175a may lead the elution water of the upper portion of the waterproof plate 170 to the drain pipe connection part 172 below the water collecting part 171, but the auxiliary oil hole pipes 175b and 175c. By providing), elution water can be induced more smoothly.

The auxiliary perforated pipes 175b and 175c are fixed by the perforated pipe fixing device. In the present embodiment, a pair of coupling rings 177a and a connection band 177b connecting the coupling rings have a predetermined interval in the longitudinal direction of the tunnel. It is illustrated in the form placed.

On the other hand, after the blasting of the two-ch main tunnel is completed, the waterproof plate 170 is a secondary perforated pipe of the waterproof plate 170 is provided with a waterproof membrane 91 provided along the two-ch main tunnel for effective collection of effluent water ( It is preferable to install integrally up to the point where 175b and 175c are located.

In addition, it is preferable that a buffer membrane 93 is further provided between the upper surfaces of the main tunnel of the waterproof membrane. The buffer membrane 93 prevents the waterproof membrane 91 from being damaged by the rough surface of the upper surface of the main tunnel, and the effluent water is smoothly collected by the waterproof plate 170 along the waterproof membrane 91. It has a role to make it possible. The material of the buffer layer 93 is not limited, and may be made of, for example, a nonwoven fabric.

In addition, a plurality of through holes 173 are formed in the waterproof plate 170 along the longitudinal direction of the tunnel.

As described above, since the upper support wall 160 and the lower support wall 150 of the tunnel are configured to connect the upper reinforcement member 167 and the lower reinforcement member 157 to reinforce integrally, the waterproof plate 170, there must be a through hole 173 through which the lower reinforcing member 157 can pass.

In the present embodiment, the lower reinforcing member 157 penetrates the waterproof plate 173 and has a structure in which the upper reinforcing member 167 and the upper part of the waterproof plate 170 are coupled to each other. Of course, the upper reinforcing member 167 passes through the through hole 173, and may be connected to the lower reinforcing member 157 at the bottom of the waterproof plate 170.

The through hole 173 is preferably formed corresponding to the arrangement of the lower reinforcing member 157. In other words, the through reinforcing hole 173 is provided in the tunnel longitudinal gap and the transverse gap of the lower reinforcing member 157 so that the lower reinforcing member 157 smoothly passes through the through hole 173 of the waterproof plate 170. It is desirable to be able to fit.

The through hole 173 is substantially elliptical, so that the lower reinforcing member 157 can smoothly penetrate the through hole 173, and the through hole 173 and the lower reinforcing member when the actual construction is performed. It is possible to smoothly cope with the difference in the tunnel length direction of 157).

Although not shown, the through hole 173 includes a sealing member around a portion through which the lower reinforcing member 157 penetrates, so that the through hole 173 and the lower reinforcing member 157 have a cross-sectional area. It is preferable to configure so as to prevent the leakage of the effluent generated.

The waterproof plate 170 is provided with one or more drain boards 179 to allow fluid to flow from the edge of the waterproof plate 170 to the center at predetermined intervals.

The shape of the drain board 179 is not limited, and may be formed in various forms.

Referring to Figures 8 and 9, the structure and shape of the vertical drain pipe located inside the column of the lower support wall will be described.

FIG. 8 is a cross-sectional view taken along the line II-II of FIG. 3, and FIG. 9 is an enlarged cross-sectional view of the portion “B” of FIG. 8.

As described above, the vertical drain pipe 155 is connected to the drain pipe connection part 172 positioned below the collecting part 171 of the waterproof plate 170 to collect the effluent collected on the upper part of the lower support wall 150. It serves to send to the drain 115 of (110).

As illustrated in FIG. 8, the vertical drain pipe 155 is formed in a zigzag form alternately disposed on the left and right sides along the longitudinal direction of the tunnel.

On the other hand, the vertical drain pipe 155 is detachable from the lower support wall 150, it is preferable to be detachably coupled from the outside.

This is to facilitate the cleaning or replacement of the vertical drain pipe 155 when lime and debris are leached or corroded with the vertical drain pipe 155 elution due to the use of the tunnel for a long time after construction.

In order to attach and detach the vertical drain pipe 155 as described above, the present embodiment arranges a total of three first fillers 151a, 151b, and 151c around the vertical drain pipe 155 as shown in FIG. 9. The second fillers 153a and 153b are arranged on the left and right sides of the first fillers 151a, 151b, and 151c.

The first filling material (151a, 151b, 151c) and the second filling material (153a, 153b) is preferably made of a heat insulating material in order to prevent the freezing in the winter of the fluid flowing in the vertical drain pipe in the winter, for example made of compressed styrofoam Can be.

On the other hand, although not shown, it is preferable that the freezing prevention means is further provided in the adjacent portion of the vertical drain pipe () to prevent freezing in winter. The freezing prevention means may be made of, for example, a heating device installed along the outer circumferential surface of the vertical drain pipe.

And in the present embodiment, the lower support wall is provided with a removable panel in contact with the outside.

Referring to the tunnel construction sequence according to the present invention.

First, the pilot tunnel 10 for erecting the central support wall 100 is excavated before excavating the designed main tunnel. After the pilot tunnel 10 is excavated, the central support wall 100 is installed.

When the installation step of the central support wall 100 is described in more detail, first, the lower reinforcing member 157 for reinforcing the structure is buried therein, and the lower support wall 150 is installed in the center lower portion of the pilot tunnel. The waterproof plate 170 is installed on the lower support wall 150.

Then, the upper reinforcing member 167 is partially inserted into the outside of the pilot tunnel 10 and partially protruded into the pilot tunnel. The upper reinforcing member 167 is accommodated therein, and an upper support wall 160 is provided on the lower support wall 150.

The lower reinforcing member 157 and the upper reinforcing member 167 are coupled to each other by the connecting member 169 to form a structure for integrally reinforcing the central support wall 100.

After the central support wall 100 is installed, two arch arch main tunnels 20 and 30 are excavated by blasting both left and right sides of the pilot tunnel 10. Excavation of the two arch main tunnels 20 and 30 is the same as the conventional excavation method of the two arch tunnel, and thus will be omitted.

After excavating the two arch main tunnels 20 and 30, an integral waterproof membrane is installed over the entire tunnel surface. Then, lining 9 is placed on the entire tunnel surface, and the paving surface 22 is installed by paving the bottom of the tunnel surface to complete the two-arch tunnel.

As described above, the preferred embodiments of the present invention have been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them.

Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

The effect of the two-arch tunnel according to the present invention described above is as follows.

First, by combining with the upper reinforcing member and the lower reinforcing member, by constructing a structure to integrally reinforce the central support wall, there is an advantage to improve the strength and durability of the two-arch tunnel.

Second, by providing a waterproof plate on the upper portion of the lower support wall, there is an advantage that can improve the waterproof performance to prevent safety accidents and solve the problems caused by the inflow of effluent.

Third, by configuring the vertical drain pipe to be detachable from the central support wall, it is easy to wash or replace the vertical drain pipe has an advantage in maintenance.

Fourth, by providing the freezing prevention means for preventing the freezing of the effluent flowing in the vertical drain pipe in the portion adjacent to the vertical drain pipe, there is an advantage of preventing the freezing of the vertical drain pipe.

Claims (21)

Pilot tunnel; A lower support wall having a lower reinforcing member embedded therein to reinforce the structure and formed at a center lower portion of the pilot tunnel; And, A portion of the upper reinforcing member partially inserted into the outside of the pilot tunnel and partially protruding into the pilot tunnel is embedded therein, and includes an upper support wall provided between the pilot tunnel and the lower support wall; The lower reinforcing member and the upper reinforcing member is coupled to each other by a connecting member 2 arch tunnel consisting of a structure for reinforcing the lower support wall and the upper support wall integrally. The method of claim 1, In the two arch tunnel, Two-arch tunnel, characterized in that provided between the lower support wall and the upper support wall, at least one waterproof plate to prevent the inflow of the eluate of the lower support wall. The method of claim 2, The waterproof plate is made of a plurality of, the two-arch tunnel, characterized in that both ends of the waterproof plate are coupled to each other in the longitudinal direction of the tunnel. The method of claim 2, Inside the lower support wall, And two or more vertical drainage pipes for draining the effluent collected at the upper portion of the waterproof plate to the lower portion of the pilot tunnel. The method of claim 2, In the waterproof plate, A two-arch tunnel, characterized in that a plurality of through holes formed along the longitudinal direction of the tunnel. The method of claim 5, In the through hole, A two-arch tunnel, characterized in that the sealing member is provided around the portion where the lower reinforcing member penetrates. The method of claim 1, The lower reinforcing member, A two-arch tunnel, characterized in that arranged in the longitudinal direction of the plurality of tunnels provided in the transverse direction of the pilot tunnel. The method of claim 2, The through hole of the waterproof plate, A two-arch tunnel, characterized in that formed in a position corresponding to the arrangement of the lower reinforcing member. The method of claim 5, The through hole formed in the waterproof plate, 2-arch tunnel, characterized in that made of an oval. The method of claim 2, In the center of the waterproof plate, The two-arch tunnel, characterized in that the water collecting portion further recessed downward along the longitudinal direction of the tunnel. The method of claim 10, In the lower part of the collecting part, 2-arch tunnel, characterized in that the drain pipe connecting portion connected to the vertical drain pipe is provided at intervals along the longitudinal direction of the tunnel. The method of claim 10, In the water collecting part, A two-arch tunnel, characterized in that the central hole is further provided along the length of the tunnel. The method of claim 10, To the left and right of the water collecting part A two-arch tunnel, characterized in that further provided with an auxiliary perforated pipe along the longitudinal direction of the tunnel. The method of claim 13, In the waterproof plate, A two-arch tunnel, characterized in that further provided with a hole pipe fixing device for fixing the auxiliary hole pipe. The method of claim 10, In the waterproof plate, A two-arch tunnel, characterized in that it further comprises at least one drain board for allowing fluid to flow from the edge of the waterproof plate to the center at intervals in the longitudinal direction of the tunnel. The method of claim 4, wherein The vertical drain pipe, A two-arch tunnel, characterized in that arranged in a zigzag form alternately to the left and right along the longitudinal direction of the tunnel. The method of claim 4, wherein In the area adjacent to the vertical drain pipe, Two-arch tunnel, characterized in that further provided with a freezing prevention means for preventing the freezing of the effluent flowing through the vertical drain pipe. The method of claim 4, wherein The vertical drain pipe, A two-arch tunnel, characterized in that detachable from the lower support wall removable from the outside. The method of claim 18, In the area adjacent to the vertical drain pipe, The two-arch tunnel, characterized in that the filling material surrounding the vertical drain pipe is further provided. Excavating a pilot tunnel; Embedding a lower reinforcing member reinforcing a structure therein to install a lower support wall formed at a center lower portion of the pilot tunnel; Installing an upper reinforcing member partially inserted into the outside of the pilot tunnel and partially protruding into the pilot tunnel; Embedding the upper reinforcing member therein and installing an upper support wall provided between the pilot tunnel and the lower support wall; And, And a step of coupling the lower reinforcement member and the upper reinforcement member to each other by a predetermined connection member. The method of claim 20, And a waterproof plate provided between the lower support wall and the upper support wall to prevent the inflow of effluent water from the lower support wall.

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