JPH07269277A - Tunnel connection method and segment therefor - Google Patents

Abstract

PURPOSE:To hold down equipment manufacturing cost and equipment weight or segment weight and comply with construction environment in large cities, such as security of a shaft construction site and minimize an overburden without any troubles and expand and reduce the cross section of tunnels and take proper measures for the installation of facilities, such as branching or joining and an emergency parking lot for every definite spacing and prevent the capacity of a shield driving machine from being increased excessively, and excavate the natural ground between the tunnels, taking cut-off measures at the same time. CONSTITUTION:In a tunnel connection method, which excavates and expands the natural ground between adjacent tunnels excavated with a specified spacing and connects each of the tunnels structurally, a sheathing board 28 is pressed into the natural ground between the tunnels from a segment 12 which constitutes at least one tunnel and covers the natural ground between the tunnels so that the earth may be retained. The natural ground surrounded by the sheathing boards 28 is excavated from the segment 12 so that the tunnel may be expanded. Each of the segments 12 is connected with a shape steel material 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel connecting method and a tunnel connecting segment, and particularly to excavation and widening of the ground between tunnels which are excavated adjacent to each other at a predetermined interval so that the tunnels are structured. TECHNICAL FIELD The present invention relates to a tunnel connecting method and a tunnel connecting segment for physically connecting.

[0002]

2. Description of the Related Art Generally, an urban tunnel has a higher construction cost than a ground structure, and its maintenance cost is often uneconomical as compared with a road on the ground. For this reason, underground roads are often constructed in unavoidable locations, and it is common to install tunnels as short and shallow as possible to shorten the approach section.

When constructing an underground tunnel,
In general, the open-cut method is often used, but the number of cases where the open-cut method cannot be adopted due to the roadside environment tends to increase in recent construction.

When the cutting method cannot be adopted as described above,
It is common to adopt a shield method and deal with it.
In the current shield construction method, the circular section is the basic section,
The maximum diameter reaches 14 m, and a large-diameter shield with a diameter of about 19 m is currently being planned.

[0005]

When the large-diameter circular shield described above is adopted, the cost for manufacturing the machine becomes enormous.
There was a problem that it was difficult to adapt to the construction environment in large cities, such as increase in machine weight, increase in segment weight and securing vertical shaft land.

Further, in the case of a shield having a large diameter, a large amount of earth covering is required, and it is difficult to employ it when a tunnel having a relatively small earth covering is installed.

[0007] Further, it is difficult to deal with the case where the tunnel cross-section is greatly expanded or reduced, when it is desired to install a facility such as branching or merging underground, or when it is desired to install an emergency parking zone or the like at regular intervals. There was a problem.

Further, there is a problem that the shield machine becomes an excessive facility for a medium distance or short distance tunnel of about several hundred meters.

Therefore, it is conceivable to use the relatively small shield machine to excavate the tunnels adjacent to each other and structurally connect the adjacent tunnels to each other to deal with the above problem.

In this case, there is a problem that the tunnels must be connected with each other with sufficient connection strength, and the connection must be performed without damaging the environment in the mine.

The present invention has been made in view of the above-mentioned conventional problems, and the purpose thereof is to reduce the cost of manufacturing a machine, the weight of a machine and the weight of a segment, and secure a site for a vertical shaft. It can be easily adapted to the environment, requires only a small amount of soil cover, and can easily handle the expansion and contraction of tunnel cross sections, installation of facilities such as branching and merging, and installation of emergency parking zones at regular intervals. The shield machine does not become excessively large even for tunnels of medium distance and short distance of about 100 m, and it has sufficient strength and can structurally connect tunnels without damaging the underground environment. To provide a tunnel connecting method and a tunnel connecting segment.

[0012]

According to the first invention,
A method of connecting tunnels that structurally connects the tunnels by excavating and widening the ground between the tunnels that have been excavated adjacent to each other at a specified interval. Of press-fitting a mountain retaining plate into the natural ground to cover the natural ground between the tunnels and perform the mountain retaining, a step of excavating the natural ground surrounded by the mountain retaining plate to widen the tunnel, and the segment And a step of connecting the two with a mold steel material.

The second aspect of the present invention is characterized in that, before the press-fitting of the mountain retaining plate, the ground of the ground around the tunnel and around the tunnel is improved.

In the third invention, the mountain retaining plates are press-fitted into the ground around the tunnels from the mutual segments constituting the adjacent tunnels, and the tip portions of the respective mountain retaining plates are superposed.
It is characterized by injecting a water blocking agent into the ground of this polymerized portion to stop water.

According to a fourth aspect of the invention, a tunnel connecting segment used for structurally connecting tunnels by excavating and widening the ground between the tunnels that are adjacently excavated at a predetermined interval. A segment main body having a rectangular cross section and a mountain retaining plate slidably provided on the outer surface of the skin plate at a rectangular cross section opposing position of the segment main body, wherein the segment main body is provided with the mountain retaining plate. A long hole for sliding the mountain retaining plate is formed in the skin plate in a direction orthogonal to the axial direction of the segment main body, and a through hole for inserting a die steel material for connection is formed in the widening side surface. I am trying.

According to a fifth aspect of the invention, the through-hole for inserting the connecting mold steel material is formed through the skin plate of the corner piece forming the corner portion of the segment body, The type steel material is characterized by being fixed to the corner piece.

[0017]

According to the first aspect of the invention, the ground retaining plate is press-fitted into the ground between the tunnels from at least one segment to cover the ground between the tunnels, and the ground is kept in a state of stopping water and retaining the mountains. After excavating and widening, the segments can be easily connected to each other by connecting the segments with a shaped steel material.

According to the second aspect of the present invention, the ground is improved from the inside of the tunnel to the surrounding ground between the tunnels, so that more reliable water-stopping measures and earth pressure measures can be taken.

According to the third aspect of the present invention, the mountain retaining plates are polymerized by press-fitting the mountain retaining plates into the ground from adjacent mutual segments and injecting the water blocking agent into the polymerized portion of each mountain retaining plate. It is possible to surely stop the water in the portion by injecting the minimum amount of the water stop agent, improve the water stop efficiency, and facilitate the widening work of the tunnel.

According to the fourth aspect of the present invention, the mountain retaining plate can be easily slid from the inside of the tunnel, and the shaped steel material can be inserted into the through hole to be connected after the widening excavation.

According to the fifth aspect of the invention, the corner pieces of the segment main body are designed in a beam structure, and the shaped steel material is fixed to the corner pieces, so that a strong connected state can be obtained. .

[0022]

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 7 are views showing a tunnel connecting segment according to an embodiment of the present invention.

The tunnel connecting segment 12 includes a segment body 26 and a mountain retaining plate 28.

The segment main body 26 is made of steel and has a substantially rectangular cross section, and has four plate-shaped segment pieces 30 and 32 on the mountain retaining side and the connecting side, and four corner portions arranged at the corners. It is composed of a piece 34.

The plate-shaped segment piece 30 on the mountain retaining side is
As shown in FIGS. 1 and 2, the main girder 36 and the joint plate 38
Is framed in a rectangular shape, a skin plate 40 is attached to one side surface thereof, and a plurality of ribs 42 are provided between the main girders 36 to form a steel material.

As shown in FIGS. 3 and 4, the segment piece 32 on the connection side has a frame of a main girder 44 and a joint plate 46 made of H-shaped steel in a rectangular frame, and a plurality of channel-shaped girders are formed between the main girders 44. It is made of a steel material formed by detachably attaching the shaped steel material 48. The segment piece 32 on the connecting side is attached with the shaped steel material 48 only on the right side in FIG. 1, but when the widening is performed in both directions, the shaped steel material 48 is also attached on the left side in the figure. It is what is done.

The corner piece 34, as shown in FIGS. 5 to 7, frames the main girder 50 and the joint plate 52 into an L-shape,
An L-shaped skin plate 54 is attached to the surface, and a plurality of ribs 56 are attached between the main girders 50, which is made of steel.

Then, the joint plate 52 of the corner piece 34
And the joint plate 3 of the adjacent segment pieces 30 and 32
The rectangular segment main body 26 is formed by connecting 8 and 46 together.

Further, as shown in FIGS. 5 and 6, the corner piece 34 on the right side in FIG. 1 for widening excavation is made of a steel material for supporting the mountain retaining plate 28 on both ends of the skin plate 54. A support member insertion opening 60 with a lid (not shown) for projecting the member 38 is formed so that the lid can be removed and the support member 58 can be inserted into the ground through the support member insertion opening 60 when the tunnel is widened. I have to.

Further, the skin plate 54 of the segment piece 30 is formed with a through hole 16 at a position between the ribs 56 for inserting a plurality of channel-shaped die steel materials 14 for connection, and the through-hole 16 has a channel shape. Type Steel Material 14
The end portions of the ribs are inserted and fixed to the ribs 56 by bolting. This type steel material 1 is fastened back to back together on the rib 56 in the middle portion, and is independently attached at both ends. In addition, skin plate 5
A lid (not shown) is attached to the through-hole 16 formed in 4 so that it can be closed when the shield is dug. The skin plate 54 is also provided with an injection hole 62 for improving the ground at the tunnel connection portion.

The mountain retaining plate 28 is slidably provided on the outer surface of the skin plate 40 of the segment piece 30 on the mountain retaining side, protrudes from the segment body 26 and covers the ground of the connecting portion, and performs the mountain retaining of the connecting portion. It is like this. Further, the skin plate 40 provided with the mountain retaining plate 28 is formed with a pair of elongated holes 66 extending in a direction orthogonal to the axial direction of the segment body 26, and the mountain retaining plate 28 is provided with a screw hole 68 facing the elongated hole 66. Are formed at predetermined intervals, and in this long hole,
As shown in FIG. 5, a pair of hydraulic jacks 70 disposed inside the segment piece 30 are connected via a connecting member (not shown), and by operating the hydraulic jacks 70, through the long holes 66. The mountain retaining plate 28 is slid. A water blocking material such as a rubber ring is provided around the elongated hole 66.

As described above, by excavating the ground by the mountain retaining plate 28, it is possible to easily and safely excavate the ground between the adjacent segments 12. Further, since the mountain retaining plate 28 is supported from the inside by the supporting member 58 projecting from the segment body 26, a sufficient supporting force can be obtained.

Next, a tunnel connecting method according to an embodiment of the present invention will be described with reference to FIGS.

First, as shown in FIG. 8, two tunnels 7 which are adjacent to each other at a predetermined interval are formed by using a rectangular shield machine.
While excavating 0, the tunnel connecting segment 10 is assembled and connected, and the excavation by the shield machine is completed.

Next, as shown in FIG.
The ground of the ground 78 at the boundary of the widening portion is improved from the inside. In this case, the injection pipe 80 is inserted into the ground 78 through the injection hole 62 formed in the skin plate 54 of the corner piece 34 that constitutes the segment body 12, and the ground improvement chemical solution is injected into the ground 78. Perform ground improvement.

Next, as shown in FIG. 10, the support member insertion opening 6 formed in the skin plate 54 of the corner piece 34.
0 is opened, and the support member 58 is inserted into the ground 78 through the support member insertion opening 60. In this case, when inserting the support member 58, a frame is installed in the segment main body 12, a hydraulic jack is installed on this frame, and the support member 58 is inserted into the ground 78 by the hydraulic jack. Further, the tip of the support member 58 is adapted to be inserted to a position that coincides with the surface of the skin plate 40 of the segment body 12. Further, when the support member 58 is inserted, a water blocking material is applied to the support member insertion port 60 so that water does not enter the segment body 12 between the support member insertion port 60 and the support member 58. I am going to leave.

Next, as shown in FIG. 11, from the segment piece 30 of each segment 12, the mountain retaining plate 28 is pressed into the ground improved ground 78 by the hydraulic jack 70, and the tip of the mountain retaining plate 28 is pressed. The parts are in a state of being polymerized. In this case, the mountain retaining plate 28 slides and protrudes through the elongated hole 66 formed in the segment piece 30. Further, since the long holes 66 are stopped by the water stop material, water does not enter the segments 12 through the long holes 66.

Further, when the mountain retaining plate 28 is pressed into the ground 78, the supporting member 58 protruding from the segment body 12 supports the mountain retaining plate 28, so that the mountain retaining plate 28 moves as the mountain retaining plate 28 moves. The plate 28 is prevented from descending forward, and the mountain retaining plate 28 is reliably supported so that reliable mountain retaining can be performed. Further, when water blocking is required in the overlapping portion between the mountain retaining plates 28, the skin plate 54
An injection pipe is inserted through the injection hole 62 to inject a waterproofing agent to surely stop the water. Note that the mountain retaining plate 28 does not necessarily have to protrude from each of the adjacent segments 12, and when the distance between the natural grounds 78 is narrow, it is also possible to project only from one of the segments 12, and in this case. It is also possible for the other segment to be a normal segment without the mountain retaining plate 28.

Next, as shown in FIG. 12, the mountain retaining plate 28
Wide excavation is performed on the ground 78 between the segments 12 surrounded by. In this case, the shaped steel material 48 attached to the segment piece 32 on the connection side is removed to open the portion facing the natural ground 78. Then, the ground 78 between the segments 12 is widened and excavated from the opened portion using an excavator such as a mini backhoe.

Next, with the ground 78 completely excavated, as shown in FIG. 13, the ends of the plurality of channel-shaped steel products 48 are inserted into the through holes 16 of the corner piece 34, By fixing the ribs 54 to each other, the segments 12 are connected to each other. This widening excavation is also performed in the vertical direction.

As described above, by connecting the segments 12 to each other with the channel-shaped die steel material 14, high-strength connection can be performed without performing gas cutting or the like, that is, without adversely affecting the underground environment. It will be possible.

By repeating such a process, it is possible to easily form a tunnel having an arbitrary width and having expansion and contraction. The tunnel thus formed can be, for example, a tunnel having a large cross section. When it is formed as a wall surface, as shown in FIG.
High-fluidity concrete 24 is cast into the inside and the widened portion of the above, and is additionally injected into the void in the upper part, whereby the work is completed.

By using such a tunnel connecting method, for example, as shown in FIG. 15, a plurality of rectangular tunnels each having a small cross section are formed at a predetermined interval along the contour of the tunnel using a rectangular shield machine. 90 is excavated, the natural ground between the tunnels 90 is widened and excavated, the tunnels 90 are connected to each other, and the concrete 24 is placed inside the wall 92.
After the construction, the ground surrounded by the wall 92 can be excavated to construct a rectangular tunnel 94 having a large cross section. The cross-sectional shape of the tunnel 94 is not limited to the shape shown in FIG. 15, and various shapes such as a convex shape, a concave shape, an L shape, and a T shape can be used.

Further, as shown in FIG. 16, the ground between the tunnels 84 is widened and excavated in the middle of the two tunnels 84,
It is also possible to connect the tunnels 84 to each other and form the station portion 86 in the middle of the two tunnels 84.

Further, as shown in FIG.
After bending each of the tunnels 88 of the book in the direction of separating from each other, the tunnels 88 are adjacent to each other, and the ground between the separated tunnels 88 is widened and excavated.
It is also possible to form the emergency parking zone 100 in the middle of 8.

The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the gist of the present invention.

For example, in the above embodiment, the mountain retaining plate is made to project from the adjacent one of the adjacent tunnel connecting segments, but the present invention is not limited to this, and when the widening width is large, both tunnel connecting segments are connected. It is also possible to project the mountain retaining plate only from the use segment.

Further, when excavating the ground between the upper and lower tunnels by widening, the ground retaining plates may be inserted into the ground from both sides of the segment body to excavate the ground surrounding the mountain retaining plates. It is possible.

Further, in the above-mentioned embodiment, the channel steel is used as the connecting type steel material, but it is not limited to this, and various shapes such as H shape, I shape and the like can be used. .

When the ground between adjacent tunnels is to be widened and excavated, as described above, the shaped steel material 48 attached to the segment piece 32 is removed to open the portion facing the ground 78, and then the ground. It is possible to excavate a mountain, but it is also possible to excavate a natural rock from the starting shaft side or the reaching shaft side.

[0052]

As described above, according to the first aspect of the invention, the mountain retaining plate is press-fitted into the ground between the tunnels from at least one segment to cover the ground between the tunnels, and the water stop and the mountains are stopped. There is an effect that the segments can be easily connected to each other by connecting the segments to each other with the shape steel material after excavating the ground with the staying and expanding the ground.

According to the second aspect of the present invention, the ground is improved from the inside of the tunnel to the surrounding area between the tunnels, so that more reliable measures against water stoppage and earth pressure can be taken.

According to the third aspect of the present invention, the mountain retaining plates are polymerized by press-fitting the mountain retaining plates into the ground from adjacent mutual segments and injecting the water blocking agent into the polymerized portion of each mountain retaining plate. It is possible to reliably perform the water stoppage in a part by injecting the minimum amount of the water stoppage agent, and it is possible to enhance the water stoppage efficiency and facilitate the tunnel widening work.

According to the fourth aspect of the present invention, the mountain retaining plate can be easily slid from the inside of the tunnel, and further, the shaped steel material can be inserted into the through hole and connected after the widening excavation. .

In the fifth aspect of the invention, the corner pieces of the segment body are designed to have a beam structure, and by fixing the die steel material to the corner pieces, a strong connected state can be obtained. There is an effect.

[Brief description of drawings]

FIG. 1 is a schematic front view of a tunnel connecting segment according to an embodiment of the present invention.

FIG. 2 is a plan view of the mountain piece side segment piece of FIG. 1 as viewed from the inside.

FIG. 3 is a front view showing a state in which the connection side segment piece of FIG. 1 is viewed from the inside.

4 is a cross-sectional view of FIG. .

5 is a front view showing a state where the corner piece of FIG. 1 is viewed from the inside. FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a cross-sectional view showing a state in which tunnels are excavated adjacent to each other at a predetermined interval.

FIG. 9 is a cross-sectional view showing a state in which the ground of the ground at the connecting portion is improved from the state of FIG.

FIG. 10 is a cross-sectional view showing a state in which a support member for a mountain retaining plate is inserted into the ground from each segment from the state of FIG.

11 is a cross-sectional view showing a state in which the mountain retaining plate is inserted into the ground from the state of FIG.

FIG. 12 is a cross-sectional view showing a state in which the ground between tunnels is excavated from the state of FIG.

13 is a cross-sectional view showing a state in which the segments are connected to each other from the state of FIG.

FIG. 14 is a cross-sectional view showing a state in which concrete is placed in the segment from the state of FIG.

FIG. 15 is a cross-sectional view showing a state in which a large-section tunnel is constructed by a tunnel connecting method according to an embodiment of the present invention.

FIG. 16 is a cross-sectional view showing a state in which a station is built in a tunnel by a tunnel connecting method according to an embodiment of the present invention.

FIG. 17 is a cross-sectional view showing a state in which an emergency parking zone is installed in a tunnel by a tunnel connecting method according to an embodiment of the present invention.

[Explanation of Codes] 14 Type Steel Material 16 Through Hole 26 Segment Main Body 28 Yamadome Plate 30, 32 Segment Piece 34 Corner Corner Piece 62 Through Hole 66 Long Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Tachikawa 1-7-1, Kyobashi, Chuo-ku, Tokyo Within Toda Construction Co., Ltd. (72) Inventor Makoto Jukagawa 1-7-1, Kyobashi, Chuo-ku, Tokyo No. Toda Construction Co., Ltd.

Claims (5)

[Claims] 1. A tunnel connection method for excavating and widening the ground between adjacent tunnels that have been excavated at a predetermined interval to structurally connect the tunnels to each other, and at least one tunnel is constructed. The process of pressing the mountain retaining plate into the ground between the tunnels from the segment to cover the ground between the tunnels and performing the mountain retaining, and excavating the ground surrounded by the mountain retaining plate to widen the tunnel. And a step of connecting the segments with a shaped steel material, the method for connecting a tunnel. 2. The method for connecting tunnels according to claim 1, wherein, before the press-fitting of the mountain retaining plate, the ground of the ground around the tunnel is improved from inside the tunnel. 3. The method according to claim 1 or 2, wherein the mountain retaining plates are press-fitted into the ground around the tunnels from the mutual segments constituting the adjacent tunnels, and the tip portions of the respective mountain retaining plates are polymerized. , A method of connecting tunnels, characterized by injecting a waterproofing agent into the ground of this superposed portion to stop the water. 4. A tunnel connecting segment used when structurally connecting tunnels by excavating and widening the ground between tunnels which are adjacently excavated at a predetermined interval, and having a rectangular cross section. A segment main body and a mountain retaining plate slidably provided on the outer surface of the skin plate at a rectangular cross-section opposing position of the segment main body, wherein the segment main body is attached to the skin plate on which the mountain retaining plate is provided. A tunnel connecting segment characterized in that a long hole for sliding the mountain retaining plate is formed in a direction orthogonal to the direction, and a through hole for inserting a mold steel material for connecting is formed in a widening side surface. 5. The mold for connection according to claim 4, wherein the through hole for inserting the connecting mold steel material is formed by penetrating a skin plate of a corner piece forming a corner portion of the segment main body. A segment for connecting tunnels, characterized in that steel is fixed to the corner piece.