JPH07259473A - Connection engineering of tunnel and segment for tunnel connection - Google Patents

Abstract

PURPOSE:To restrain mechinery manufacturing cost, to restrain machinery weight and segment weight, to easily adapt to a construction environment in a big city such as acquisition of a site for vertical shafts, to minimize earth covering, to easily cope with setting of facilities such as expansion, contraction, branching and confluence of tunnel sections, and setting of an emergency parking belt, etc. with constant intervals and to carry out digging of a natural ground between tunnels without making a shielding machine excessively large even for middle-distance and short-distance tunnels of about hundreds meters and while performing an earth pressure countermeasure and a water stop countermeasure. CONSTITUTION:Tunnels 70 are connected to each other by digging and widening a natural ground 72 between the tunnels 70 dug adjacent to each other with a specified interval. In this case, water stopping and land slide protection are carried out by covering the natural ground 72 between the tunnels 70 by way of press fitting land slide protection plates 14 in the natural ground 72 between the tunnels 70 from a segment main body 12 constituting at least one of the tunnels 70. Thereafter, the tunnels 70 are widened and connected to each other by digging the natural ground 72 surrounded by the land slide protection plates 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 in particular, excavates and widens the ground between adjacent tunnels excavated at a predetermined interval to connect the tunnels to each other. The present invention relates to a tunnel connection construction method and a tunnel connection segment.

[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.

Further, it is difficult to deal with the case where the tunnel cross-section is greatly enlarged or reduced, or 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 connect the adjacent tunnels to each other to deal with the above problem.

In this case, when connecting the tunnels,
There was a problem that the ground between the tunnels had to be excavated, and for that purpose earth pressure measures and water stop measures had to be taken.

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 oversized even for medium- and short-distance tunnels of about 100 m, and it is possible to excavate the ground between tunnels while taking measures against earth pressure and water stoppage. It is to provide a connection method and a segment for tunnel connection.

[0012]

According to the first invention,
A method for connecting tunnels by excavating and widening the ground between adjacent tunnels that have been excavated at a specified interval, and connecting at least one tunnel. A step of press-fitting a mountain retaining plate on the ground to cover the ground between the tunnels to stop the water and hold the mountain; and a step of excavating the ground surrounded by the mountain retaining plate to widen the tunnel to connect the ground. It is characterized by including and.

The second aspect of the invention is characterized in that the ground is improved from the inside of the tunnel to the surroundings between the tunnels before the press-fitting of the mountain retaining plate.

According to the third aspect of the invention, the mountain retaining plates are press-fitted into the ground between the tunnels from the mutual segments constituting the adjacent tunnels, and the tip portions of the respective mountain retaining plates are superposed, and the superposed portions are formed. It is characterized by injecting a waterproofing agent into the natural ground to stop the water.

According to a fourth aspect of the present invention, there is provided a tunnel connecting segment used for connecting tunnels by excavating and widening the ground between adjacent tunnels which are excavated at a predetermined interval. A segment main body having a rectangular cross section, a mountain retaining plate slidably provided on the outer surface of the skin plate at a position opposite to the rectangular cross section of the segment main body, and a mountain retaining plate disposed in the segment main body and press-fitting the mountain retaining plate into the ground. And a slide driving means for
A long hole extending in a direction orthogonal to the axial direction of the segment main body is formed, and a water blocking material for stopping water between the long hole and the mountain retaining plate is disposed on an outer peripheral surface of the long hole. Is formed with a connecting portion which faces the elongated hole of the skin plate and is connected to the slide driving means through the elongated hole.

In a fifth aspect of the invention, a plurality of the connecting portions are formed at intervals shorter than the length of the long hole and also at a position beyond the long hole, and the skin plate has a long length. It is characterized in that a joint hole for fixing the mountain retaining plate is formed at a position corresponding to the connecting portion beyond the hole, and the joint hole also serves as a backfill agent injection hole.

The sixth invention is characterized in that a slide guide for the mountain retaining plate is provided at a position corresponding to the mountain retaining plate side portion of the skin plate.

In the seventh invention, as the slide driving means, a hydraulic jack having a mountain retaining plate connecting jig at its tip is attached in the segment body, and the rear end of the hydraulic jack and the load bearing member of the segment body are attached. The feature is that a reinforcing member is attached between them.

[0019]

According to the first aspect of the present 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 water is stopped and the mountains are retained. It is possible to surely stop the water and to keep the mountain. Therefore, it is possible to easily widen the ground surrounded by the mountain retaining plate under the condition of the surely to stop the water and the mountain.

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 waterproofing and earth pressure countermeasures 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 waterproofing agent into the polymerized portion of each mountain retaining plate. It becomes 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 waterproofing material is provided on the outer surface around the long hole for sliding the mountain retaining plate formed in the skin plate, so that the reliable stopping can be achieved regardless of the existence of the long hole. It becomes possible to carry out water, and moreover, by connecting the slide driving means to the screw hole facing the elongated hole formed in the mountain retaining plate, it becomes possible to easily slide the mountain retaining plate.

According to the fifth aspect of the present invention, the connecting portion is formed even at a position beyond the long hole, so that the long hole is shortened to improve the water-stopping efficiency and the slide driving means is sequentially exposed to the long hole. It is possible to secure a sufficient amount of sliding of the mountain retaining plate by changing to the connecting part that is open, and backfilling from the joint hole formed at the position corresponding to the connecting part beyond the long hole of the skin plate. By injecting the agent, it is possible to inject the backfill agent easily and in a short time without separately providing a backfill agent injection hole.

According to the sixth aspect of the present invention, by providing the skin plate with the slide guide of the mountain retaining plate, the mountain retaining plate can be stably inserted into the natural ground, and when the mountain retaining plate is inserted. When the tip end portion of the mountain retaining plate is displaced and the base end side is likely to be lifted, the slide guide is prevented from rising and the water stopping property of the long hole can be maintained.

In the seventh invention, a hydraulic jack is used as the slide driving means, and a reinforcing member is attached between the hydraulic jack and the main girder of the segment main body so that a reaction force is exerted on the proof member of the segment main body. Therefore, a sufficient reaction force can be obtained without special reinforcement of the segment body.

[0026]

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

1 to 10 are views showing a tunnel connection segment according to an embodiment of the present invention.

The tunnel connecting segment 10 includes a segment body 12 and a mountain retaining plate 14.

The segment body 12 is made of steel and has a substantially rectangular cross section, and includes four plate-shaped segment pieces 16 and 17 at the upper and lower portions and both side portions, and four corner piece pieces arranged at the corner portions. It is composed of 18 and.

The upper and lower plate-shaped segment pieces 16 are
Main girder 20a and joint plate 20b in which a shaped steel material is framed in a rectangular shape
A skin plate 22 made of a steel plate is attached to one side surface of the above, and a plurality of ribs 24 are formed between the main girders 20a.

The plate-shaped segment pieces 17 on both sides are
A plurality of channel-shaped mold steel materials 21 are detachably attached between the main girder 20a and the joint plate 20b, which are formed by framing the mold steel material.

The corner piece 18 has a substantially L-shaped steel plate 26 with a bent portion being chamfered, a main girder 28a and a joint plate 28b mounted around the steel plate 26, and a space between the main girder 28a. The segment body 12 is formed by connecting the joint plate 28b, which is composed of a plurality of attached ribs 30 and is located on the longitudinal side, and the main girder 20 of the segment piece 16 adjacent to the joint plate 28b.

Further, the corner piece 18 has a steel support member 32 for supporting the mountain retaining plate 14 at both ends of the steel plate 26.
A support member insertion opening 34 with a lid for projecting is formed, and the lid is removed when the tunnel is widened so that the support member 32 can be inserted into the ground through the support member insertion opening 34.

Further, the joint plate 20 of the segment piece 16
b, through holes 36 through which stress materials such as reinforcing bars or PC steel rods for connecting adjacent segment bodies 12 are inserted in the joint plate 28 and the steel plate 26 of the corner piece 18 at predetermined intervals. There is. A lid is attached to the through hole 36 formed in the steel plate 26 so that the stress material can be inserted by removing the lid when the tunnel is widened.
The through hole 36 of the steel plate 26 can also be used as an injection hole for improving the ground at the tunnel connection portion.

The mountain retaining plate 14 is slidably provided on the outer surface of the skin plate 22 at a position opposite to the rectangular cross section of the segment body 12. In this embodiment, the mountain retaining plate 14 of the skin plate 22 located on the upper and lower surfaces of the segment body 12 is arranged. A steel plate retaining plate 14 is slidably provided on the outer surface of the tunnel so that the tunnel can be laterally widened. In addition, when expanding the tunnel in the vertical direction, the segment main body 12
1 on the outer surface of the skin plate 22 located on the side of the
4 is slidably provided, and the mountain retaining plate 14 is slid in the vertical direction, so that the tunnel can be widened up and down.

Further, the skin plate 22 provided with the mountain retaining plate 14 is formed with a pair of elongated holes 38 extending in a direction orthogonal to the axial direction of the segment body 12, and the mountain retaining plate 14 is elongated in the skin plate 22. A plurality of screw holes 40 are formed at predetermined intervals as a connection portion of the slide driving means facing 38. Then, a water blocking material 42 is provided on the outer surface around the elongated hole 38.
Is arranged to stop the water between the mountain retaining plate 14. As shown in FIG. 4, the water blocking member 42 has a long hole 3
8 is fitted in a mounting groove 46 formed on the outer periphery of 8 through a joining plate 44 in a partially protruding state, and a rubber ring is used as the water blocking material 42, for example.

Further, the screw hole 40 is the length L1 of the long hole 38.
Is formed at a distance L2 shorter than the above, and is formed at a position beyond the long hole 38, and the long hole 38 of the skin plate 22 is formed.
A connecting bolt mounting hole 48 for fixing the mountain retaining plate 14 is formed at a position corresponding to the screw hole 40 beyond the position, and as shown in FIG. 5, the connecting bolt 50 is inserted from the connecting bolt mounting hole 48 to form a screw hole. The thread retaining plate 14
Can be fixed to the skin plate 22. Further, after removing the joining bolt 50, as shown in FIG. 6, the lid 52 can be screwed and closed so that the lid 52 can be removed and used as a backfill agent injection hole when necessary. I have to.

As the slide driving means, FIG. 9 and FIG.
As shown in FIG. 0, a hydraulic jack 54 is used. The hydraulic jack 54 is arranged inside the segment pieces 16 positioned vertically, and the mountain retaining plate connecting jig 56 is provided at the tip of the hydraulic jack 54. By mounting the bolt 58 provided on the mountain retaining plate connecting jig 56 into the screw hole 40 of the mountain retaining plate 14 and operating the hydraulic jack 54,
The mountain retaining plate 14 is slid. And
After sliding the mountain retaining plate 14 within the range of the length L1 of the long hole 38, the bolt 58 is screwed into the screw hole 40 next facing the long hole 38.
By replacing them with each other and sliding them one by one, it is possible to secure a sufficient sliding amount of the mountain retaining plate 14 even with the short long holes 38. Further, by shortening the long holes 38, it is possible to reduce the water blocking area and improve the water blocking performance. Further, a reaction force receiving member 59 that abuts against the joint plate 20b serving as a strength member is attached to the rear end of the hydraulic jack 54, and the reaction force receiving member 59 is used to press the mountain retaining plate 14 into the joint plate 20b. I try to have a reaction force. In addition to the joint plate 20b, ribs may be reinforced and used as the proof member.

Further, the segment pieces 1 located above and below
On the skin plate 22 of No. 6, a pair of slide guides 60 are arranged in parallel at the positions corresponding to the side portions of the mountain retaining plate 14.
I am trying to do the guide of 4. This slide guide 60 is in a state in which one side of an angle steel plate is attached to the skin plate 22 and the insertion groove of the mountain retaining plate 14 is formed oppositely. Further, the mounting position of the slide guide 60 is such that the mountain retaining plate 14 is completely inserted into the natural ground.
It is designed to be installed at a position where it does not come off. Due to the presence of the slide guide 60, the mountain retaining plate 14 can be prevented from being lowered to the front as the mountain retaining plate 14 moves, and the contact state between the mountain retaining plate 14 and the skin plate 22 can be maintained. By maintaining it, the water blocking effect of the water blocking material 42 can be maintained.

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. 14, while excavating two adjacent tunnels 70 at a predetermined interval by using a rectangular shield machine, the tunnel connecting segments 10 are assembled and connected, and the shield machine is used. Complete the dig.

Next, as shown in FIG. 15, the tunnel 70
Ground improvement of the ground 72 above and below the widening portion of the tunnel 70 is performed from inside. In this case, the injection pipe 74 is inserted into the ground 72 through the through hole 36 formed in the steel plate 26 of the corner piece 18 that constitutes the segment body 12, and the ground improvement chemical solution is injected into the ground 72 to inject the ground. Make improvements.

Next, as shown in FIG. 16, the support member insertion opening 34 formed in the steel plate 26 of the corner piece 18 is opened, and the support member 32 is inserted through the support member insertion opening 34.
Insert within 2. In this case, when inserting the support member 32, a mount (not shown) is installed in the segment main body 12, a hydraulic jack is installed on this mount, and the support member 32 is set in the ground 72 by the hydraulic jack. I am trying to insert it. In addition, the tip of the support member 32 has the segment main body 12
The skin plate 22 is inserted to a position corresponding to the upper and lower surfaces thereof. Further, when the support member 32 is inserted, a water blocking material is applied to the support member insertion port 34 so that water does not enter the segment body 12 between the support member insertion port 34 and the support member 32. I try to keep it.

Next, as shown in FIG. 17, the mountain retaining plate 14 is pressed into the ground improved ground 72 from above and below each of the tunnel connecting segments 10 so that the tips of the mountain retaining plate 14 are brought into contact with each other. Let the polymerize. In this case, the joining bolt 50 which penetrates the joining bolt mounting hole 48 and is screwed into the screw hole 40 of the mountain retaining plate 14 is removed, and a backfilling agent is attached to the surrounding ground 72 from the joining bolt mounting hole 48 as needed. inject. After injecting the backfill material, the lid 52 may be attached to the joining bolt attachment hole 48 to stop the water. Further, the bolt 58 provided on the mountain retaining plate connecting jig 56 at the tip of the hydraulic jack 54 is screwed into the screw hole 40 facing the elongated hole 38 of the skin plate 22 to operate the hydraulic jack 54, and sequentially face the elongated hole 38. By operating the hydraulic jack 54 while replacing the thread retaining plate connecting jig 56 with the screw hole 40, the thread retaining plate 14 is press-fitted at a predetermined distance. In this case, the long hole 38
Since the length is short, the water-stopping area is small and the water-stopping property is improved. Further, the mountain retaining plate 1 by the hydraulic jack 54
Since the joint plate 20b receives the reaction force of No. 4 at the time of press fitting through the reaction force receiving member 59, it is possible to obtain a sufficient press input.

When the mountain retaining plate 14 is pressed into the natural ground 72, the slide guide 60 attached to the skin plate 22 of the segment piece 16 guides the mountain retaining plate 14 and supports the segment body 12 so as to project therefrom. Member 32
Since the mountain retaining plate 14 supports the mountain retaining plate 14, it is possible to prevent the mountain retaining plate 14 from moving forward and to prevent the mountain retaining plate 14 from contacting with the skin plate 22. Therefore, the water blocking effect of the water blocking member 42 can be reliably maintained.

Further, when water stoppage is required at the overlapping portion between the mountain retaining plates 14, a through hole 36 of the steel plate 26 is opened, and a water injection agent is injected by inserting an injection pipe to surely stop water. I am trying to do it.

Next, as shown in FIG. 18, the mountain retaining plate 14
Wide excavation is performed on the ground 72 between the tunnels 70 surrounded by. In this case, the channel-shaped steel plate 21 is removed from the plate-shaped segment piece 17 on the side facing the widening ground 72 of each segment body 12 to open the side. Then, the ground between the tunnels 70 is widened and excavated from the open side portion by using an excavator such as a mini backhoe.

Next, in a state in which the natural ground 72 is completely excavated, as shown in FIG.
The plurality of channel-shaped steel plates 21 removed from 7 are used to connect the main girders 20 of the side segment pieces 17 together, and the PC steel rods 76 are inserted into the through holes 36 of the corner piece 18 and tightened. , Axial force about the degree of loosening is applied to the PC steel rod 76.

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 78 is poured into the inside and the widened portion of the above, and then secondary injection into the upper void is completed.

By using such a tunnel connecting method, for example, as shown in FIG. 11, 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. 70 is excavated, the ground between the tunnels 70 is widened and excavated, the tunnels 70 are connected to each other, concrete 78 is placed inside, and a wall 80 is formed.
After constructing, the ground surrounded by the wall 80 can be excavated to construct a rectangular tunnel 82 having a large cross section. Further, the sectional shape of the tunnel 82 is not limited to the shape shown in FIG. 11, 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. 12, 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. 13, after the two adjacent tunnels 88 are bent in the directions to separate from each other, the tunnels 88 are adjacent to each other and the ground between the separated tunnels 88 is increased. Widening excavation, tunnel 88
It is also possible to form the emergency parking zone 90 on the way.

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

For example, in the above-mentioned embodiment, the case where the hydraulic jack is used as the slide driving means of the mountain retaining plate has been described. However, the present invention is not limited to this example. It is possible to use various slide driving means in addition to connecting and sliding the mountain retaining plate.

Further, although the mountain retaining plate is made to project from both of the adjacent tunnel connecting segments, the present invention is not limited to this, and when the widening width is small, only one of the tunnel connecting segments is retained. It is also possible to make the plate protrude.

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 main body to excavate the ground surrounding the mountain retaining plates. It is possible.

[0057]

As described above, according to the first aspect of the present 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. By retaining the water, it is possible to easily and surely stop the water and retain the mountain, and to easily expand the ground surrounded by the retaining plate under the condition of the reliable stop and the retaining mountain. There is an effect that can be.

According to the second aspect of the present invention, there is an effect that it is possible to more reliably take measures against water stoppage and earth pressure by improving the ground in the ground around the tunnel from the inside of the tunnel.

According to the third aspect of the present invention, the mountain retaining plates are polymerized by press-fitting the mountain retaining plates from the adjacent mutual segments into the ground and injecting the waterproofing agent into the polymerized portion of each mountain retaining plate. There is an effect that the water can be surely stopped in the part by injecting the minimum amount of the water stop agent, the water stop efficiency can be improved, and the widening work of the tunnel can be facilitated.

According to the fourth aspect of the present invention, the water blocking material is provided on the outer surface around the long hole for sliding the mountain retaining plate formed on the skin plate to ensure a reliable stop regardless of the existence of the long hole. There is an effect that water can be supplied, and moreover, the mountain retaining plate can be easily slid by connecting the slide driving means to the screw hole facing the elongated hole formed in the mountain retaining plate.

In the fifth aspect of the present invention, by forming a screw hole at a position beyond the long hole, the long hole can be shortened to improve the water-stopping efficiency, and the slide driving means can be sequentially arranged in the long hole. It is possible to secure a sufficient amount of sliding of the mountain retaining plate by replacing it with the connecting part which is open, and moreover, the back side of the connecting bolt mounting hole formed at the position corresponding to the connecting part beyond the long hole of the skin plate. By injecting the backfilling agent, it is possible to inject the backfilling agent easily and in a short time without separately providing a backfilling agent injection hole.

According to the sixth aspect of the present invention, by providing the skin plate with the slide guide of the mountain retaining plate, the mountain retaining plate can be stably inserted into the natural ground, and when the mountain retaining plate is inserted. When the tip end of the mountain retaining plate is displaced and the base end side is likely to be lifted, the slide guide is prevented from rising and the water blocking material can maintain the watertightness of the long hole.

In the seventh invention, a hydraulic jack is used as the slide driving means, and a reinforcing member is attached between the hydraulic jack and the main girder of the segment main body so that a reaction force is exerted on the proof member of the segment main body. Therefore, there is an effect that a sufficient reaction force can be obtained without special reinforcement of the segment main body.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged view of a state in which the mountain retaining plate of FIG. 2 is removed.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged cross-sectional view of the joining bolt mounting state at the joining bolt mounting hole position of the segment body.

FIG. 6 is an enlarged cross-sectional view showing a state in which the joining bolt is removed from the state of FIG. 3 and a water blocking cap is attached.

FIG. 7 is a side view showing a state of a slide guide of the segment main body.

FIG. 8 is a front view showing a state of a slide guide of the segment main body.

FIG. 9 is a cross-sectional view showing how the hydraulic jack is attached to the segment body.

10 is a cross-sectional view taken along line XX of FIG.

FIG. 11 is an explanatory diagram showing a state in which a tunnel having a large cross section is constructed by a tunnel connecting method according to an embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a state in which a station is built in a tunnel by a tunnel connection construction method according to an embodiment of the present invention.

FIG. 13 is an explanatory view showing a state in which an emergency parking zone is installed in the tunnel by the tunnel connecting method according to the embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a state in which tunnels are excavated adjacent to each other at a predetermined interval.

FIG. 15 is a cross-sectional view showing a state in which the ground at the connection portion is improved from the state of FIG. 14;

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

FIG. 17 is a cross-sectional view showing a state in which the mountain retaining plate is inserted into the ground from the state of FIG.

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

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

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

[Explanation of symbols]

 10 Segment for tunnel connection 12 Segment body 14 Yamadome plate 16 Segment piece 18 Corner piece 20a, 28a Main girder 22 Skin plate 24, 30 Rib 38 Long hole 40 Screw hole 42 Water blocking material 48 Joint bolt mounting hole 56 Yamadome Plate connection jig 58 Bolt 60 Slide guide

 ─────────────────────────────────────────────────── ─── 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 (7)

[Claims] 1. A method for connecting tunnels, in which at least one tunnel is constructed by excavating and widening the ground between tunnels that have been excavated at a predetermined interval and connecting the tunnels. A process of press-fitting a mountain retaining plate into the ground between the tunnels to cover the ground between the tunnels to stop water and retain the mountain, and excavate the ground surrounded by the mountain retaining plate to widen the tunnel. , A connecting step, and a connecting method of the tunnel. 2. The method for connecting a tunnel according to claim 1, wherein prior to the press-fitting of the mountain retaining plate, the ground is improved from the inside of the tunnel to the surrounding area between the tunnels. 3. The method according to claim 1 or 2, wherein the mountain retaining plates are press-fitted into the ground between the tunnels from the mutual segments forming the adjacent tunnels to polymerize the tip end portions of the respective mountain retaining plates, A method of connecting a tunnel characterized by injecting a waterproofing agent into the ground to stop the water. 4. A segment for tunnel connection, which is used when excavating a ground between tunnels which are excavated adjacent to each other at a predetermined interval to widen and connect the tunnels to each other, the segment main body having a rectangular cross section. A mountain retaining plate slidably provided on an outer surface of the skin plate at a position facing the rectangular cross section of the segment main body, and a slide driving means which is disposed in the segment main body and press-fits the mountain retaining plate into the ground.
The skin plate is formed with a long hole extending in a direction orthogonal to the axial direction of the segment body, and a water blocking material for stopping water between the mountain retaining plate and an outer surface of the long hole. And a connecting portion facing the elongated hole of the skin plate and connected to the slide drive means through the elongated hole is formed in the mountain retaining plate. 5. The connection part according to claim 4, wherein a plurality of the connection portions are formed at intervals shorter than the length of the elongated hole and at a position beyond the elongated hole, and the skin plate has elongated holes. A segment for tunnel connection characterized in that a joining hole for fixing the mountain retaining plate is formed at a position corresponding to the connecting portion in an overlying position, and the joining hole also serves as a backfill agent injection hole. 6. The segment for tunnel connection according to claim 4, wherein a slide guide for the mountain retaining plate is provided at a position corresponding to the mountain retaining plate side portion of the skin plate. 7. A hydraulic jack having a mountain retaining plate connecting jig at the tip as the slide driving means is mounted in the segment main body, and the rear end of the hydraulic jack and the proof stress of the segment main body according to any one of claims 4 to 6. A segment for tunnel connection characterized in that a reinforcing member is attached between the segment and the member.