KR101149895B1 - Reinforcement block for pillar of tunnel - Google Patents

Abstract

PURPOSE: A reinforcement block for a pillar part of a tunnel is provided to reduce construction time and costs because an additional center wall is not required. CONSTITUTION: A reinforcement block(1) for a pillar part of a tunnel is composed of two or more unit blocks(10,12,14). Each unit block has a narrow top and a wide bottom to have a curved side surface. Retreated grooves(16) are vertically formed on the inner surface of the unit blocks. Timber members(3) are installed in the retreated grooves. Multiple reinforcement through holes(100) are formed in the narrow top of each unit block to be upward inclined.

Description

Reinforcement block for pillar of tunnel}

The present invention relates to a tunnel pillar reinforcement block, and more particularly, to a tunnel pillar reinforcement block constructed on a tunnel wall surface to reinforce pillar ground between a tunnel and a tunnel.

In the case of parallel tunnels in which two tunnels are formed in parallel, a tunnel is generally constructed with a sufficient distance between the tunnels for structural stability of the tunnel. In this case, although there is a slight difference depending on the ground condition, by ensuring the distance between the tunnel more than 1.5 times based on the tunnel excavation width to ensure the structural stability of the tunnel.

However, it is sometimes difficult to secure more than 1.5 times the distance of tunnel excavation due to the terrain conditions and environmental problems of the tunnel construction. As an alternative to this, a two-arch tunnel excavation method is known, in which a central tunnel is first constructed in a central part where two tunnels are to be formed, thereby making a central wall (usually a concrete column), and then excavating a main tunnel side by side. .

The two-arch tunnel excavation method has the advantage of excavating the central tunnel to create a central wall and extending the main ship next to it. However, after the construction of the central tunnel for the formation of the central wall, the main tunnel must be expanded and excavated in turn, the process for tunnel excavation is quite complex, thus the air has a long and expensive construction cost.

There is also a construction method that excavates a large cross-section tunnel consisting of one arch and forms a column or wall in the center thereof. However, this construction method requires pillars or walls for efficient ventilation and median function due to confrontation traffic, so the width of the tunnel is wider than 1.0 ~ 1.5m compared to the conventional four-way tunnel, and thus the structural stability of the tunnel. This has the disadvantage of becoming vulnerable.

The problem to be solved by the present invention is to provide a tunnel pillar reinforcement block that can implement a structurally more stable two-arch tunnel without forming a separate central tunnel excavation and a central wall.

Another problem to be solved by the present invention is that it is possible to implement the air shortening and construction cost reduction by not having to form a separate central wall.

According to an aspect of the present invention as a means for solving the problem, the precast reinforcement block is a pre-fabricated reinforcement block, the lower portion has a curved side that is wider and narrower toward the upper portion, and the inner side continuous support in the vertical direction (支 保 材) Grooves for installation are formed at intervals in the longitudinal direction, the narrow upper side provides a tunnel pillar reinforcement block formed with a plurality of upper reinforcing material through-holes obliquely upward in the diagonal direction.

In the present embodiment, the precast reinforcement block may be formed of two or more unit blocks assembled up and down, and convex portions and recesses for coupling between unit blocks may be formed on the assembly surface on which each unit block is assembled.

In addition, each unit block is formed a plurality of reinforcing holes leading to one along the upward or downward oblique direction when assembling between the unit blocks, unit blocks arranged up and down by inserting a steel material into the reinforcing holes connected to one and filling the filler (Filler) Strong solidarity can be achieved.

At this time, each unit block can be assembled to each other in the state in which the concrete adhesive is applied to the assembly surface.

In addition, a lower reinforcing member through hole may be further inclined downward in the lowermost unit block positioned at the bottom of the unit blocks, and a lower reinforcing material may be installed under the ground through the lower reinforcing material through hole.

The base concrete may be further installed below the lowest unit block located at the bottom of the unit blocks. In this case, convex portions and recesses for assembling with each other may be formed on the lower surface of the lowermost unit block and the upper surface of the base concrete.

The foundation concrete may be firmly fixed on the foundation ground through one or more reinforcing materials installed through the foundation.

When the precast reinforcement block is composed of three or more unit blocks, the outer circular arc length of the middle unit blocks may be larger than the inner circular arc length so that the intermediate unit blocks are not pushed into the tunnel even in the side pressure of the pillar ground. Can be.

In addition, a curved front plate may be further installed on the outer side of the precast reinforcement block having a curved side to prevent the block from being damaged by vibration due to a trailing tunnel at a later side.

Through the upper reinforcing material through-holes, the upper reinforcing material for firmly fixing the ground and the reinforcing block may be installed to be inclined upward on the ground.

In addition, the precast reinforcement block may be configured to form a vertical butt face for butt construction with other precast reinforcement blocks that are installed opposite the outer surface.

In this case, the precast reinforcement block has a plurality of horizontal through-holes are formed when the two precast reinforcement blocks are installed in the form of a butt, the two precast reinforcement block is a medium through the tension member fitted to the horizontal through-hole It can be connected integrally.

In addition, a horizontal drain pipe is installed along the construction direction of the reinforcement block at a valley point where two precast reinforcement blocks facing each other during the butting construction, and vertical drain pipes connected to the horizontal drain pipe are buried at intervals in each precast reinforcement block. It may be a configuration.

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According to the tunnel pillar reinforcement block according to the embodiment of the present invention, by using the precast block manufactured in advance, by reinforcing the ground between the tunnel and the tunnel to be utilized as a pillar portion (center wall), when constructing a two-arch tunnel It is possible to realize structurally stable pillar parts (central wall) without separate central tunnel and central wall construction, and it can be expected to reduce air shortening and construction cost by omitting the central tunnel and central wall construction.

1 is a perspective view of a tunnel pillar reinforcing block according to an aspect of the present invention.
Figure 2 is an exploded perspective view showing the tunnel pillar reinforcement block shown in Figure 1 exploded.
Figure 3 is a side view of the construction of the tunnel pillar reinforcement block according to an aspect of the present invention.
4 to 6 is a side view showing a preferred embodiment of the tunnel pillar reinforcement block according to an aspect of the present invention.
7 to 9 is a side view showing a further preferred embodiment of the tunnel pillar reinforcement block according to an aspect of the present invention.
10 to 18 is a schematic view showing step by step the construction process of the tunnel performed according to the two-arch tunnel construction method of another aspect of the present invention.
19 is a front view of the two-arch tunnel finally completed by the two-arch tunnel construction method.
20 is a front view of a tunnel according to another embodiment of the two-arch tunnel construction method.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the tunnel pillar reinforcement block and the two-arch tunnel construction method using the same according to the present invention. In the following description of the present invention, a detailed description of components known to unnecessarily obscure the well-known configuration and the subject matter of the invention will be omitted. In addition, the same reference numerals will be given to the same components.

1. Tunnel pillar reinforcement block

The configuration of the tunnel pillar reinforcement block according to an aspect of the present invention will be described first.

1 is a perspective view of a tunnel pillar reinforcement block according to an aspect of the present invention, Figure 2 is an exploded perspective view showing the tunnel pillar reinforcement block shown in FIG. And Figure 3 is a construction side view of the tunnel pillar reinforcement block according to an aspect of the present invention, Figures 4 to 6 is a construction side view showing another preferred embodiment of the tunnel pillar reinforcement block according to an aspect of the present invention.

1 to 3, the pillar reinforcement block 1 according to one side is a precast reinforcement block made in advance from the outside, and two or more units are assembled in a vertically stacked form. It is composed of blocks. Hereinafter, the pillar reinforcement block 1 composed of three unit blocks 10, 12, 14 will be described as an example. However, the number of unit blocks is not limited to the number shown.

The reinforcement block 1, which consists of several (three) unit blocks 10, 12, 14, has a curved side that is wider at the bottom and narrower in width toward the top, and is continuous in the vertical direction on the inner side. Grooves 16 are formed at intervals in the longitudinal direction. The groove 16 is provided with a support material (支 保 材, 3) to support the load on the tunnel excavation surface, a plurality of upper reinforcing material through hole 100 is provided in the narrow unit block 10 located in the upper side of the unit block It is formed to be inclined upward in an oblique direction.

Through the upper reinforcing material through-hole 100, the upper reinforcing material 5 is installed to be inclined upward toward the ground of the tunnel pillar part, thereby stabilizing the ground and firmly fixing the unit block 10 located at the upper side to the excavation surface side. The upper reinforcement 5 may be a lock bolt, a nail, an anchor, a steel pipe, F.R.P, etc. having an axially extending length, and may be firmly fixed to the ground through grouting.

Convex portions 102 and recesses 104 are formed on the assembly surface on which the unit blocks 10 are assembled. When the convex portion 102 and the recess portion 104 are formed, a firm coupling between the unit blocks 10 as well as a solid unit block is realized so that the unit blocks 10 are not pushed into the tunnel even in the side pressure of the pillar. Can be.

In the present embodiment, the convex portion 102 and the recess 104 are not particularly limited in shape if they can be engaged with each other, and concrete adhesive is applied to each unit block 10 assembling surface for a more firm coupling. Can be.

Each unit block 10, 12, 14 is provided with a plurality of reinforcing holes 106 leading to one along the upward or downward oblique direction when assembled together. The linear reinforcing steel 4 such as reinforcing bars, steel bars, and nails is inserted into the reinforcing holes 106 connected to one, and a filler such as mortar is filled in the reinforcing hole 106 into which the steel is inserted. Therefore, the unit blocks 10, 12, 14 disposed up and down can form a more solid binding through the steel (4).

The base concrete 2 may be installed under the lowermost unit block 14 located at the bottom of the unit blocks 10. In this case, as shown in the lower surface of the lowermost unit block 14 and the upper surface of the base concrete 2, the convex portion 102 and the concave portion 204 for a more secure assembly between the unit blocks, respectively. It may be formed, as in another preferred embodiment of Figure 4, if firmly fixed on the foundation ground via one or more reinforcing materials 20, it can serve as a pile to resist the upper load.

The base concrete 2 may be a precast block, which is advantageous for shortening of air, similar to the unit block 10. However, the present invention is not limited thereto, and in some cases, it is possible to form a formwork and concrete by using an on-site construction method. Furthermore, if the tunnel excavation ground on which the foundation concrete 2 is to be installed includes hard rock, the construction may be omitted if necessary.

When the precast reinforcement block 1 is composed of three or more unit blocks 10, 12, 14, the inner arc length (a) of the unit block 10 located in the middle is smaller than the outer arc length (b). (FIG. 4), the unit block 10 located in the middle is more firmly fixed in the form of being pinched between the other unit blocks 10 arranged above and below, even though the pillar ground pressure is not pushed into the tunnel. Can be.

The outer surface of the reinforcement block 1 may be provided with a curved front plate 7 as in the other preferred embodiment of FIG. 5. The front plate 7 is installed for the purpose of preventing the cracks or breakage by protecting the reinforcement block 1 of the pre-installed prior tunnel 300 from the vibration caused when the trailing tunnel 400 is excavated. The front plate 7 is installed on the excavation surface before installation of the reinforcement block or when the unit block 10 is pre-assembled on the outer surface of each unit block 10 constituting the reinforcement block, the construction is close to the excavation surface. Can be.

The lower reinforcing member through hole 140 may be formed to be inclined downward in the lowermost unit block 10 (see FIG. 6). Through the lower reinforcing material through-hole 140, the lower reinforcing material may be installed as a ground, as shown in the drawing, and thus the lowermost unit block 14 may be more firmly fixed on the excavation ground. In the installation of the lower reinforcing material (6) it is good to be installed to be inclined downward in the direction of the other adjacent tunnel, so as to help also to stabilize the lower ground of the filler portion to be formed between the tunnels.

7 to 9 are side views showing still another embodiment of the tunnel pillar reinforcement block according to an aspect of the present invention.

7 to 9, the reinforcement block 1 according to another embodiment of the present invention may include two reinforcement blocks so that two tunnels can be constructed in close proximity when the filler part ground can be omitted between tunnels according to the ground state. 1) It can be applied in construction in the form of face to face. The configuration of the reinforcing block 1 according to another embodiment will be described in more detail.

As shown in the figure, a vertical butt face 110 may be formed on the outer surface of the reinforcement block 1 for a butt construction with another reinforcement block 1 installed oppositely. And each reinforcing block 1, as shown in Figure 8, in the construction of the two reinforcing block 1 in the form of facing can be formed a plurality of horizontal through-holes 112 leading to one. In this case, the tension member 8 may be inserted into the horizontal through hole 112 to integrate the two reinforcement blocks 1, and thus, a more rigid pillar may be realized.

Of course, although not shown in detail through the drawings, even in the case of the embodiment shown in Figures 1 to 6 that do not form the butt surface 110, the horizontal through-hole (not shown) in each of the precast reinforcement block to be opposed construction In this case as well, by fixing the tension member shown in FIG. 8 described above in the horizontal through hole through pressure grouting or the like, the two reinforcing blocks and the filler part ground positioned therebetween can be more firmly formed. .

At the point where the two reinforcing blocks (1) facing each other at the construction of the butt construction, a horizontal drain pipe (9a) can be installed along the construction direction of the reinforcing block (1) as shown in FIG. And the vertical drain pipe (9b) connected to the horizontal drain pipe (9a) may be installed in a form that is embedded at intervals in each reinforcing block (1). If the drain pipe is installed in this way, it is possible to clearly solve the leak problem that frequently occurs at the intersection of the two tunnel cross-section can improve the construction quality.

Next, a second arch tunnel construction method performed using the aforementioned tunnel pillar reinforcement block, which is another aspect of the present invention, will be described.

2. Construction method of 2 arch tunnel using tunnel pillar reinforcement block

10 to 19 is a view schematically showing step by step the construction process of the tunnel carried out according to the two-arch tunnel construction method that is another aspect of the present invention.

Referring to these drawings, first excavating the preceding tunnel 300 in the shape of the planned tunnel as shown in Figure 10, and further excavated the side portion of the preceding tunnel 300 to create a space 310 for installing the pillar reinforcement block (1) Secure. Then, as shown in Figure 11, through the first shotcrete 320 treatment for the tunnel drilling surface, including the additional drilling surface to stabilize the drilling surface of the preceding tunnel (300).

When the primary shotcrete 320 is completed, the foundation trench is disposed in the lower portion of the additional excavation 310 of the preceding tunnel 300 as shown in FIG. 12, and the foundation concrete 2 is constructed as shown in FIG. 13. . The foundation concrete 2 may be a precast block, and although not shown in the drawing, before and after the construction of the foundation concrete 2, the primary shotcrete may be formed by additional reinforcing materials such as rock bolt, nail, anchor, steel pipe, and FRP. Reinforcement to the treated excavation surface may be performed (320).

After the construction of the foundation concrete (2), install the tunnel pillar reinforcement block 1 according to one aspect of the present invention over the foundation concrete (2) (Fig. 14). Then, as shown in FIG. 15, the tunnel pillar reinforcement block 1 may be firmly fixed by using upper and lower reinforcement materials 5 and 6, and the tunnel pillar reinforcement block 1 and the excavation surface may be fixed. Fill the filler 330, such as mortar, so that the empty space between the filling (FIG. 16).

Next, as shown in Figure 17 by installing the support material (3) at regular intervals along the tunnel excavation cross section so as to support the excavation surface upper load. If the excavation ground is a hard rock, such support material installation process may be omitted in some cases.

Finally, the construction of the preceding tunnel 300 may be completed by treating the secondary shotcrete 340 over the excavation surface of the preceding tunnel 300, including the exposed surface of the tunnel pillar reinforcement block 1 as shown in FIG. 18. At this time, after the second shotcrete 340 is poured, the shotcrete surface may be provided with a waterproof sheet for waterproofing.

The trailing tunnel is the same as the construction of the preceding tunnel 300 shown in FIG. 10 to FIG. 18, and thus a detailed description related to the construction of the trailing tunnel will be omitted. FIG. 19 illustrates a two-arch tunnel structure in which two tunnels completed in parallel by the construction of the trailing tunnel 400 in the same manner as the preceding tunnel construction adjacent to the side of the preceding tunnel 300 are arranged in parallel.

On the other hand, in the implementation of the two-arch tunnel as shown in Figure 19, the reinforcement (5) (6) to be installed in each tunnel, the reinforcement extending from each tunnel when viewed from the tunnel longitudinal cross-section direction is oblique over the pillar reinforcement block (1) It is good to install so as to form a pattern crossing each other in the direction. When the reinforcement constructed in each tunnel is installed in a cross shape as shown in the figure, it is possible to effectively respond to the shear load of the upper ground of the filler portion can realize a more robust and stable tunnel structurally.

On the other hand, after constructing the reinforcement block in the preceding tunnel and the following tunnel in the above manner, as shown in Figure 20, each tunnel side reinforcing block (1) in the horizontal hole in the pillar portion 500 between the holes 500 (H) is drilled, by fixing the tension member (8) in the punching hole (H) by the pressure grouting method, and firmly connects the reinforcing block on the preceding tunnel and the reinforcing tunnel side, and at the same time the filler portion present between The ground 500 may be more firm.

In addition, although not shown in detail through the drawings, depending on the ground state in which the preceding tunnel and the trailing tunnel is formed, the reinforcement block described above may be installed only in any one tunnel wall surface of the preceding tunnel or the trailing tunnel. Therefore, it should be noted that the construction method for constructing the reinforcing block only on one tunnel wall may be included in the scope of the present invention.

According to the tunnel pillar reinforcement block and the two-arch tunnel construction method using the same according to an embodiment of the present invention, the ground between the tunnel and the tunnel using a precast block manufactured in advance and used as a pillar portion (center wall) By constructing a two-arch tunnel, it is possible to realize a structurally stable pillar part (center wall) without the construction of a separate central tunnel and a central wall. Can be.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

1: Reinforcement block 2: Foundation concrete
3: support material 4: steel
5: upper reinforcement 6: lower reinforcement
7: front panel 8: tension member
9a, 9b: drain pipe 10, 12, 14: unit block
102: convex portion 104, 204: groove portion
110: butt face 112: horizontal through hole
300: preceding tunnel 310: additional excavation
320, 340: shotcrete 330: filler
400: trailing tunnel

Claims (21)

It is a precast reinforcement block that has been manufactured. The lower part has a curved side that is wider and becomes narrower toward the upper part, and the inner side has grooves for vertically supporting support materials installed at intervals in the longitudinal direction. On the upper narrow side, a plurality of upper reinforcing material through holes are formed to be inclined upward in an oblique direction,
The precast reinforcement block is composed of two or more unit blocks are assembled up and down, each assembly block is assembled with each other convex portion and groove portion for coupling between unit blocks are formed, respectively,
Each unit block has a plurality of reinforcing holes leading to one along the up or down oblique direction when assembling between the unit blocks, inserting a steel material into the reinforcing holes connected to one, and filling the filler (Filler) and firmly arranged up and down Tunnel pillar reinforcement block, characterized in that the binding is implemented.
delete delete The method of claim 1,
Tunnel pillar reinforcement block, characterized in that the concrete adhesive is applied to the unit block assembly surface.
The method of claim 1,
The lower reinforcing member through hole is further formed to be inclined downward in the lowest unit block located at the bottom of the unit blocks.
Tunnel pillar reinforcement block, characterized in that the lower reinforcing material is inclined to the lower ground through the lower reinforcing material through-hole.
The method of claim 1,
Tunnel pillar reinforcement block, characterized in that the foundation concrete is further installed under the lowest unit block located at the bottom of the unit block.
The method according to claim 6,
Tunnel pillar reinforcement block, characterized in that the convex portion and the concave portion for assembling each other are formed on the lower surface of the lowermost unit block and the upper surface of the foundation concrete.
The method of claim 7, wherein
The foundation concrete is a pillar pillar reinforcement block characterized in that it is firmly fixed on the foundation ground through one or more reinforcing material is installed through the ground.
The method of claim 1,
In the case of three or more unit blocks, the outer circular arc length of the unit blocks located in the middle is larger than the inner circular arc length, so that the intermediate unit blocks are not pushed into the tunnel even in the side pressure of the pillar ground. Reinforcement block.
The method of claim 1,
Tunnel pillar reinforcement block, characterized in that the curved front plate is further installed on the outer surface of the precast reinforcement block having a curved side.
The method of claim 1,
Tunnel pillar reinforcement block, characterized in that the upper reinforcing material is installed to be inclined upwardly on the ground through the upper reinforcing material through-hole reinforcement and solid fixing of the reinforcing block.
It is a precast reinforcement block that has been manufactured. The lower part has a curved side that is wider and becomes narrower toward the upper part, and the inner side has grooves for vertically supporting support materials installed at intervals in the longitudinal direction. On the upper narrow side, a plurality of upper reinforcing material through holes are formed to be inclined upward in an oblique direction,
The precast reinforcement block is composed of two or more unit blocks are assembled up and down, each assembly block is assembled with each other convex portion and groove portion for coupling between unit blocks are formed, respectively,
Each unit block has a plurality of reinforcing holes leading to one along the up or down oblique direction when assembling between the unit blocks, inserting a steel material into the reinforcing holes connected to one, and filling the filler (Filler) and firmly arranged up and down Unity is implemented,
Tunnel pillar reinforcement block on the outer surface of the precast reinforcement block is characterized in that a vertical butt face for butt construction with other precast reinforcement block is installed opposite.
The method of claim 12,
The precast reinforcement block has a plurality of horizontal through-holes are formed when the two precast reinforcement blocks are installed in a butt-type construction,
Tunnel pillar reinforcement block, characterized in that the two precast reinforcement blocks can be connected integrally via a tension member fitted in the horizontal through-hole.
The method of claim 13,
Horizontal drain pipe is installed along the construction direction of the reinforcement block at the valley point where two precast reinforcement blocks meet during the butt construction.
Tunnel pillar reinforcement block, characterized in that the vertical drain pipe connected to the horizontal drain pipe is embedded at intervals in each precast reinforcement block.
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