JP3249390B2 - Tunnel opening method and dismantling device used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a tunnel having an integral structure by opening tunnels constructed vertically and in parallel, and a dismantling apparatus used for the method. The present invention relates to a method for opening a tunnel between adjacent upper and lower small-section tunnels in a large-section tunnel construction method for constructing a large-section tunnel from a small-section tunnel, and a dismantling apparatus used in the method.

[0002]

2. Description of the Related Art In constructing a large-section tunnel, if a large-section shield machine cannot be used due to various restrictions, as shown in FIG. A plurality of small-section tunnels 1, 1... Are excavated and constructed in parallel to each other in an annular shape, and then these adjacent ones are opened to construct a frame outer peripheral portion 2 as shown in FIG. A method of excavating and constructing the inside of the frame outer peripheral portion 2 to complete a large-section tunnel 3 as shown in FIG. 13 is adopted (Japanese Patent Laid-Open No. Hei 4-309693).
09693).

[0003] Such a large-section tunnel construction method requires a considerably long construction period and requires enormous costs, so that it is an issue to perform more rational construction. In particular, in the step of opening the adjacent small-section tunnels 1 and 1, the grout agent was previously injected into the left and right outer portions 5 and 5 of the gap 4 between the small-section tunnels 1 and 1 to perform a water stoppage measure. rear,
While dismantling the lining body of the small-section tunnel 1 facing the gap 4, the excavation of the earth and sand in the gap 4 is performed.
Since most of the steps are performed manually, the efficiency is extremely low, and this is one of the bottlenecks in the large-section tunnel construction method.

[0004] Therefore, in the case of constructing a tunnel having an integral structure by opening a plurality of tunnels as in such a large-section tunnel construction method, there is a technical problem to be solved in order to open the tunnels efficiently. Problems arise, and an object of the present invention is to solve the problems.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problem, and opens a space between adjacent upper and lower tunnels in a multistage tunnel constructed in parallel with the upper and lower sides. A method in which a temporary cross beam is intermittently erected in advance in each tunnel along a tunnel of the tunnel, and the earth and sand in the gap is filled with an external ground on both sides of a gap between adjacent tunnels. A dismantling device for laying a temporary rail on the cross beam, holding a piece of the lining body on the rail and moving the piece, and a transport trolley for unloading the piece, By mounting, the floor portion of the lining body of the upper tunnel is dismantled and removed in advance for each piece, and the earth and sand in the gap exposed by the removal is turned into a trencher running on the lining body of the lower tunnel. Excavated and excavated First, the ceiling portion of the lining of the lower tunnel exposed behind the trencher is dismantled and removed for each piece, and thereafter, the lower ends of the left and right sides of the lining of the upper tunnel and the left and right sides of the lining of the lower tunnel are removed. An object of the present invention is to provide an inter-tunnel opening method for connecting the upper end of the tunnel with a joint means.

The dismantling device is formed in a gate shape by a horizontal structure disposed above the rail and a main column for supporting the horizontal structure from front, rear, left and right, and a lower portion of the main column. The traveling means is formed so as to be able to travel on the rail, and further, a piece gripping means is vertically provided on the horizontal structure part, and the piece gripping means is movable in the horizontal structure part back and forth and right and left. Further, the present invention provides a disassembly device which is formed so as to be capable of expanding and contracting downward, and further provided with a piece gripping portion which rotates around a vertical axis at a lower end of the piece gripping means.

[0007] Further, there is provided a dismantling device mounted on a rail laid in the upper tunnel, wherein the piece gripping portion is provided with an extruding member for pushing the piece forward, and
A dismantling device mounted with a hoist for lifting and lifting the piece on the horizontal structure portion, and a dismantling device mounted on a rail laid in the lower tunnel, wherein the arm capable of raising and lowering in the front-rear direction on the horizontal structure portion Together with
The arm is formed so as to be movable in the horizontal structure part back and forth and right and left, and also provides a disassembly device capable of holding the joint means at the tip of the arm.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. In FIG. 1, reference numeral 11 denotes a lower tunnel having a rectangular cross section. The lower tunnel 11 excavates the ground in a rectangular cross section with a shield machine, and a piece of a lining body 12 is provided behind the shield machine. .. Are sequentially constructed while being connected by bolts.

At the same time as the construction work of the lower tunnel 11, a temporary transverse beam 14 is erected in the inner cavity of the lining body 12 in the left-right horizontal direction. The cross beam 14 is formed of an H-shaped steel material, and the left and right ends thereof are respectively the lining body 1.
The right and left side walls 12L and 12R are bolted to the inner side surfaces of the left and right side walls 12L and 12R, and are arranged side by side at regular intervals along the direction of the tunnel of the lower tunnel 11 (perpendicular to the paper).

After the lower tunnel 11, an upper tunnel 15 having a rectangular cross section is constructed above the lower tunnel 11. Similarly to the lower tunnel 11, the upper tunnel 15 is constructed sequentially while connecting the pieces 17, 17,... Of the lining body 16 to the rear of the shield machine with bolts. Cross beams 18 are installed in the cavity at regular intervals. When the upper tunnel 15 is constructed, the operation of setting the sheet piles 20 on both sides of the gap 19 formed between the upper tunnel 15 and the lower tunnel 11 is also performed.

The sheet pile 20 is formed of an iron plate, and is housed in advance on the left and right inner side surfaces of a shield machine which excavates the upper tunnel 15.
Each time a 7-minute span is built, one by one is pushed out of the shield machine, and the left and right side wall portions 16L, 16L,
16R outside of lower end and lining body 12 of lower tunnel 11
The left and right side walls 12L, 12R are bridged to the outside of the upper end, and are connected to the leading edge of the sheet pile 20 installed immediately before that without any gap. The sheet piles 20, 20... Installed continuously in this manner constitute a continuous water stoppage (earth retaining) wall that blocks the earth and sand in the gap 19 from the outside ground.

In this embodiment, the lining bodies 12 and 16 are used to temporarily cover the lower tunnel 11 and the upper tunnel 15 until the outer periphery of the frame of the large-section tunnel is constructed. Since it is a temporary lining body functioning as a body, each of the pieces 13 and 17 is formed in a box shape by a steel plate. This is because steel plates are lighter and easier to disassemble than reinforced concrete.

However, each of the pieces 13 and 17 may be made of reinforced concrete and used as it is as a part of the outer peripheral portion of the frame of the large-section tunnel. In such a case, the efficiency of the casting work on the outer peripheral portion of the frame is improved.
13T, 13T ... and the upper tunnel 15
17F, 1 constituting the floor 16F of the lining body 16 of FIG.
7F ... needs to be dismantled and removed, and the earth and sand in the gap 19 needs to be excavated and discharged. Therefore, these pieces 13T, 17
Regarding F, in any case, it is formed of a steel plate.

FIG. 2 shows the state of the work of opening the upper tunnel 15 and the lower tunnel 11. The disassembling device 21 and the transport trolley 22 introduced into the upper tunnel 15 show the floor section. 16F is dismantled and removed in advance for each piece 17F, and then the soil in the gap 19 exposed by removing the floor 16F is removed from the lower tunnel 1.
The excavated earth is discharged by the trencher 23 running on the lining body 12 (that is, on the ceiling 12T). Then, the ceiling portion 12T exposed to the rear of the trencher 23 is dismantled and removed for each piece 13T by the dismantling device 24 and the transport cart 25 introduced into the lower tunnel 11.

FIGS. 3 to 5 show the upper tunnel 1.
5 is an enlarged view of the disassembly and removal work area of the floor 16F in FIG. 5, and temporary rails 26 are laid along the tunnels on the cross beams 18, 18,... Have been. The rail 26 is a wide rail 26
W and the narrow rail 26 sandwiched between the wide rails 26W
N, and the dismantling device 21 is mounted on the wide rail 26W, and the transport carriage 22 is mounted on the narrow rail 26N. Further, the wide rail 26W has a length only slightly extending before and after the dismantling device 21, but the narrow rail 26 </ b> N continues from the vicinity of the center of the dismantling device 21 to the entrance of the upper tunnel 15. I have.

The disassembling device 21 is provided with the wide rail 2
It is formed in a gate shape by a horizontal structure portion 27 disposed above 6W and main columns 28, 28,... Which support the horizontal structure portion 27 from front, rear, left and right. The main columns 28, 28 ...
Wheels 29 are arranged at the lower portions of the wide rails 26W, respectively. Further, a predetermined wheel 29 is provided with a traveling motor 30 so that the dismantling device 21 can travel on the wide rail 26W.

Two running beams 31, 31 are provided in the horizontal structure 27 in the front-rear direction (the left-right direction in FIG. 4). Two transverse shafts 32, 32 made of H-shaped steel are bridged below and perpendicular to the running beams 31, 31, and trolleys 33 are arranged at both ends of the transverse shafts 32, 32, respectively. The trolley 33 is installed and the traveling girder 31
The trolley 33 is further equipped with a traveling motor 34.

Further, a piece gripping device 35 is disposed between the two transverse shafts 32, 32, and trolleys 36 are disposed at four front, rear, left and right positions at the upper end of the piece gripping device 35. The trolley 36 meshes with the traverse shaft 32, and the trolley 36 is equipped with a traverse motor 37.

Thus, when the traveling motor 34 is driven, the piece gripping device 35 moves in the front-rear direction in the horizontal structure 27 along the traversing shafts 32, 32, while the traversing motor 37 is moved. When driven, the piece gripping device 35
Is moved in the horizontal structure 27 in the left-right direction (vertical direction in FIG. 4) by being guided by the transverse shafts 32, 32.

The piece gripping device 35 has an inner cylinder 39 inserted below an outer cylinder 38 at an upper base end portion and a telescopic cylinder 40 disposed therein, so that the piece gripping device 35 can expand and contract downward. Is formed. Further, a gear 41 is provided around the outer part of the outer cylinder 38, and a pinion 43 at the tip of a turning motor 42 installed above the piece gripping device 35 is provided.
The outer cylinder 38 and the inner cylinder 39 are formed so as to be rotatable around a vertical axis by meshing with the gear 41. A piece grip portion 44 having a U-shape in a side view is attached to a tip (lower end) of the inner cylinder 39.

Thus, the rear end of the floor 16F in the tunnel direction
Piece 17F (right in FIG. 3) ₁When dismantling
The piece holding device 35 is attached to the piece 17F.₁On the rear side of
And extend the telescopic cylinder 40 so that
The piece gripping part 44 is moved between the cross beams 18
7F₁Lay on the rear side. And the piece gripper
44 forward and project forward from both lower left and right ends.
Take the fork 45 out and place it on the piece 17F.₁On the underside of
The grasping jack 4 provided on the upper jaw 46
7 to extend the piece 17F₁Bite.

The piece 17F₁Is the center of the floor 16F
If not right and left side wall 16L, 16R
In this case, the swing motor 42 moves the piece gripper 44 to the left.
Turn the piece 17F₁Bite.
And the piece 17F₁To the piece 17 around it
After removing the tied bolts,
40 and shrink the piece 17F₁To the upper cross beam 18
Up to the extent that it does not interfere, and
Drive the traveling motor 34 while turning 44 forward.
So that the piece gripping device 35 does not interfere with the cross beam 18
To move forward. Then, the grip jack 47
And projecting to the rear of the piece gripper 44.
Pushed pusher rod 48 forward,
SU 17F ₁Is placed on the floor 16F in front of it.

The pusher rod 48 is formed so that its rearwardly projecting portion can be pivoted upward about a substantially central portion of the side surface of the piece gripping portion 44 as a fulcrum. This is to prevent the pusher rod 48 from interfering with the cross beam 18 when the piece grip portion 44 is inserted and removed from between the cross beams 18.

A hoist 49 is mounted on the horizontal structure 27 in front of the piece gripping device 35.
The hoist 49 is formed to be movable back and forth and left and right in the horizontal structure 27 in the same manner as the piece gripping device 35. That is, a traverse shaft 51 is bridged over the traveling girders 31, 31 via a trolley 50 with a traveling motor.
1, the trolley 52 of the hoist 49 is engaged, and the hook block 53 of the hoist 49 is
Is drooping.

The hook block 53 is connected to the floor
Piece 17F placed on 16F ₁Hanging on one end of
If lifted and lifted, the piece 17F₁Diagonally and beam 1
It can be taken out from above between 8,18. Soshi
And distributing the transport carriage 22 below the dismantling device 21;
The piece 17F₁Is loaded on the transport vehicle 22. Thus
Then, the transport carriage 22 is moved to a battery car (not shown).
By pulling the piece 17F₁The upper tunnel
15 Take out.

Subsequently, the rear end portion of the wide rail 26W is detached and added to the front end of the wide rail 26W, and the piece gripping portion 44 is lifted upward from between the cross beams 18, and the The traveling motor 30 is driven to move the dismantling device 21 forward by a span of one piece 17 minutes, and the piece 17F immediately before the piece 17F ₁ is moved forward.
Start dismantling and removal of ₂ . By repeating such an operation, the pieces 17F of the floor 16F are sequentially dismantled and removed, and the earth and sand in the gap 19 below the pieces 17F is exposed.

As described above, this earth and sand is the trencher 2
It is excavated and discharged at 3. As shown in FIG. 2, the trencher 23 has a boom 55 that extends upward and downward and swings right and left in front of a traveling machine body 54, and a screw cutter 56 is provided at a tip of the boom 55. Immediately behind and behind the screw cutter 56, a soil collection protector 5 is provided.
7 is disposed to scoop up the excavated earth and sand by the screw cutter 56, and the collected excavated earth and sand is sucked into a vacuum discharging pipe 58 opened at a central portion of the earthing protector 57. Although not specifically shown, the vacuum discharge pipe 58 is connected to the collection protector 57.
Is piped from the central part of the vehicle to one side of the traveling body 54 to the outside of the rear tunnel, whereby the excavated earth and sand is discharged to the outside of the tunnel.

FIGS. 6 to 8 are enlarged views of the vicinity of the disassembly and removal work of the ceiling 12T of the lower tunnel 11 exposed behind the trencher 23. FIG. The basic structure and function of the dismantling device 24 used for dismantling and removing the ceiling 12T are substantially the same as those of the dismantling device 21. The same reference numerals are given and the description is omitted, and the structure and function different from the dismantling device 21 will be described.

As in the case of the upper tunnel 15, wide rails and narrow rails are also laid on the horizontal beams 14, 14,... Of the lower tunnel 11, so that the horizontal beams 18, 18,. The same reference numerals as those of the rails laid above shall be used. That is, the dismantling device 2 is mounted on the wide rail 26W.
4 is mounted, and the transport cart 25 is mounted on the narrow rail 26N.
Are mounted so as to be able to travel in the direction of the tunnel respectively.

The floor 16 of the upper tunnel 15
F dismantling and removal work and the ceiling 12T of the lower tunnel 11
Comparing with the dismantling removal work of the above, in the former, the piece 17F was dismantled by inserting the piece gripping portion 44 downward from between the cross beams 18, 18, whereas in the latter, the piece 17F should be dismantled. Since the piece 13T is located above the cross beam 14, the piece 13T is disassembled without inserting and removing the piece gripping portion 44 from between the cross beams 14, 14, and the piece gripping portion 44 engages the piece 13T. Piece 13 held
T is directly loaded on the carrier 25.
Therefore, in the dismantling device 24 used in the latter, the pusher rod 48 and the hoist 49 in the dismantling device 21 used in the former are unnecessary and are not provided.

On the other hand, the latter dismantling device 24 is provided with a joint piece handling device 59. A slide box 60 is provided at the base end of the joint piece handling device 59. The slide box 60 includes two slide boxes 60 which extend over the horizontal structure 27 in the left-right direction (vertical direction in FIG. 7). Guide shafts 61, 61
Is formed so as to be slidable along. The guide shafts 61, 61 are provided on the left and right main beams 27 of the horizontal structure 27.
L, 27R front and rear direction (left and right direction in FIG. 7)
It is slidably formed. Therefore, the slide box 60 is formed so as to be able to move in the horizontal structure portion 27 in the front-rear and left-right directions.

At the front end of the slide box 60, an arm 62 is extended so as to be able to move up and down in the front-rear direction.
A joint piece handling section 6 is provided at the tip of the arm 62.
Reference numeral 3 extends in the front-rear direction so as to be freely raised. Here, the raising operation of the arm 62 is performed by an arm jack 64, and the raising operation of the joint piece handling unit 63 is performed by a pitching jack 65.

In the joint piece handling section 63, a cylindrical guide tube 66 is provided horizontally at the center thereof, and a guide rod 67 is inserted through the guide tube 66. The left and right end portions of the guide rod 67 project to the left and right outer sides of the guide tube 66, respectively.
A lateral moving jack 6 disposed at the front of the guide cylinder 66
By expanding and contracting 8, the guide rod 67 can be made to protrude further to the left or to the right.

A grip body 69 is provided at each of the right and left ends of the guide rod 67, and an expanding grip 70 is provided at the end of the grip body 69. The expanding grip 70 is formed into a pair of scissors by two grips 71, 71, and each of the grips 71.
Is pivotally attached to the grip body 69 so as to rotate in the horizontal direction, and when the opening / closing jack 72 provided on the grip body 69 is operated, these two grips 71 are interlocked with each other. Is configured to rotate in the opposite direction. That is, the expansion grip 70 is formed so as to be openable and closable by the operation of the opening and closing jack 72.

FIGS. 9 and 10 show the joint pieces 73 and 74 to be engaged with the expanding grip 70. FIG. Each of the joint pieces 73 and 74 is formed of a steel plate into a comb shape having substantially the same shape, and four flat comb tooth plates 76 and
76 are erected at regular intervals. Also, base 7
The rear end of 5 (back left in both figures) is a comb tooth plate 76, 76.
While warping in the shape of an arc in the opposite direction to the surface on which the
Bolt holes 77 are formed in the vicinity of the left and right end sides (left front and right rear in both figures) of the base 75.

On the other hand, a joint piece 74 shown in FIG.
Of the comb teeth plates 76, 76...
Are drilled, but such bolt holes are not drilled in the comb teeth plates 76 of the joint piece 73 shown in FIG. The ear plates 79, 79 ... are provided horizontally on the front end sides (right front in FIG. 9) of the comb tooth plates 76, 76 ... of the joint piece 73 shown in FIG.
9, 79.. Are each provided with a bolt hole 80.

As shown in FIGS. 6 to 8, pieces 13T of the ceiling 12T in the lower tunnel 11 are formed.
By using the piece gripping device 35 of the dismantling device 24.
Each time the span is disassembled, the joint piece handling device 59 is used to connect the lower ends of the left and right side walls 16L and 16F of the upper tunnel 15 and the upper ends of the left and right side walls 12L and 12R of the lower tunnel 11 to the joint pieces 73,
Connect at 74.

That is, the joint pieces 73 and 74 are held one by one on the right or left expanding grip 70 of the joint piece handling device 59, and the slide box 60, the arm 62 and the joint piece handling section 63 are held together. By operating the joint piece 73, the left and right side wall portions 1 of the upper tunnel 15 are moved.
The joint piece 74 is fixed to the lower ends of the left and right side walls 12L and 12F of the lower tunnel 11.

More specifically, first, the expanding grip 70 is inserted between two adjacent comb-tooth plates 76, 76 in the joint piece 73 or 74, and the expanding grip 70 is further expanded. The joint piece 73 or 74 is held. The joint piece 73 has its base 75
Are held upward, and the joint piece 74 is held with its base 75 downward. When connecting between the left and right side wall portions 16L and 12L, the joint piece 73 or 74 is held by the expanding grip 70 disposed on the left side of the joint piece handling portion 63,
When connecting between the right side wall parts 16R and 12R, the joint piece 73 or 74 is held by the expanding grip 70 provided on the right side of the joint piece handling part 63.

Next, the joint piece 73 or 74 is carried to the left and right side walls 16L and 16F or 12L and 12F. At this time, the rough positioning is performed by the slide box 6.
The horizontal movement of 0 and the elevation of the arm 62 are performed, and the fine adjustment is performed by the elevation of the joint piece handling unit 63 and the lateral movement of the guide rod 67. In the case of the joint piece 73, the base 75 is brought into contact with the lower end surfaces of the left and right side walls 16L, 16F of the upper tunnel 15, and the bolts are tightened through the bolt holes 77, 77, so that the lower part is lowered. Join to the end face. Similarly,
The joint piece 74 has its base 75 in contact with the upper end surfaces of the left and right side walls 12L and 12F of the lower tunnel 11, and is tightly joined to the upper end surfaces with bolts.

At this time, the joint pieces 73, 7
The arc-shaped warped portion of the base 75 of the No. 4 is just engaged with the R portion formed on the outside of the lower end surface of the left and right side wall portions 16L, 16F or the outer portion of the upper end surface of the left and right side wall portions 12L, 12F. Become. Further, the joint piece 73 and the joint piece 74 that face each other up and down in this way also have their comb tooth plates 76, 76... One side of the plate 76 comes into contact with one side of the opposing comb tooth plate 76.

Thereafter, bolt holes 78, 78,... Formed in the comb tooth plates 76, 76,.
Are formed in the comb tooth plates 76, 76,... Of the upper joint piece 73, and the two are tightly joined by bolts. The reason why the comb holes 76, 76,... Of the one joint piece 73 are formed at the site is to flexibly cope with manufacturing errors and construction errors.

Then, through a bolt hole 80 formed in the ear plate 79 of the joint piece 73, a flat joint plate (see FIG. 4) is formed on the surface of the joint pieces 73 and 74 which are vertically combined and faces the inside of the tunnel. By fixing (not shown), the gap between each comb tooth plate 76 is closed from the inside of the tunnel.

Thus, the ceiling 12 of the lower tunnel 11
The right and left side walls 16L and 16R of the upper tunnel 15 and the left and right side walls 12 of the lower tunnel 11 after the T is dismantled and removed.
L and 12R, the joint pieces 73, 73... And 74, 74... And the joint plate are continuously loaded along the direction of the tunnel, and the left and right side wall portions 16L and 16R and the left and right side wall portions 12L and 12R are connected, and the upper tunnel 15 and the lower tunnel 11 are opened to form an integrated tunnel.

After that, reinforcing members are arranged in the lumens of the opened upper and lower tunnels 15 and 11, and filling concrete is filled to form the outer peripheral portion of the body of the large-section tunnel.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0047]

As described above, according to the present invention,
The tunnels constructed in parallel in the vertical direction can be extremely efficiently opened by using a dismantling device, a transport trolley, and a trencher and by rational work setup.

In other words, by installing the retaining walls on both sides of the gap between the tunnels in advance, it becomes unnecessary to inject the grout material around the gap. Also, in the work of dismantling and removing the floor of the upper tunnel and the ceiling of the lower tunnel, the dismantling device and the transport vehicle suitable for the work content can be installed efficiently with almost no human power. Can be shortened.

Further, the dismantling device for dismantling the ceiling portion of the lower tunnel has a function of holding joint means for connecting the left and right sides of the upper and lower tunnels and moving the tunnel to a predetermined position. Thereby, the work content is further mechanized, and the labor can be reduced.

[Brief description of the drawings]

FIG. 1 is a front cross-sectional view of main parts of upper and lower tunnels after the upper and lower tunnels have been constructed and before opening.

FIG. 2 is a side cross-sectional view of the entire work site showing work for opening upper and lower tunnels.

FIG. 3 is an enlarged side sectional view of a working portion around the upper tunnel in FIG. 2;

FIG. 4 is a cross-sectional plan view of FIG.

FIG. 5 is a front sectional view of FIG.

FIG. 6 is an enlarged side cross-sectional view of a work portion around the lower tunnel in FIG. 2;

FIG. 7 is a plan sectional view of FIG.

FIG. 8 is a front sectional view of FIG.

FIG. 9 is a perspective view of a joint piece joined to lower ends of left and right side walls of the upper tunnel.

FIG. 10 is a perspective view of a joint piece joined to upper ends of left and right side walls of the lower tunnel.

FIG. 11 is an explanatory view of a construction method of a large-section tunnel, which is one embodiment of the present invention, showing a state in which a small-section tunnel is constructed in a ring-shaped parallel to the outer peripheral portion of the body of the large-section tunnel; Sectional illustration.

FIG. 12 is an explanatory front sectional view showing a state in which a small-section tunnel is continued and an outer peripheral portion of a large-section tunnel is constructed in FIG. 11;

FIG. 13 is an explanatory front sectional view of the completed large-section tunnel in FIG. 11;

[Explanation of symbols]

 11 lower tunnel 12,16 lining body 12L, 12R, 16L, 16R left and right side wall part 12T ceiling part 13,13T, 17,17F piece 14,18 cross beam 16F floor part 19 gap 20 sheet pile 21,24 dismantling device 22,25 transport Dolly 23 Trencher 26 Rail 26W Wide rail 26N Narrow rail 27 Horizontal structure 28 Main pillar 35 Gripping device 44 Piece gripper 48 Pusher rod 49 Hoist 58 Vacuum discharge pipe 59 Joint piece handling device 60 Slide box 62 Arm 63 Joint piece handling portion 70 Expansion grip 71 Grip 73, 74 Joint piece 75 Base 76 Comb plate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-124400 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 13/02

Claims (4)

(57) [Claims] 1. A method for opening a tunnel between adjacent upper and lower tunnels in a multi-stage tunnel constructed in parallel with an upper and lower side, wherein a temporary cross beam is provided in advance in each tunnel along a tunnel of the tunnel. Equipped intermittently, and, at both sides of the gap between adjacent tunnels, installing a retaining wall that blocks earth and sand in the gap from the outside ground, and laying temporary rails on the cross beams, Further, by mounting a dismantling device for gripping and moving the piece of the lining body on the rail and a transport cart for unloading the piece, the lining body floor portion of the upper tunnel is preceded for each piece. The earth and sand in the gap exposed by the removal is excavated and discharged by a trencher running on the lining body of the lower tunnel, and the lining body of the lower tunnel exposed behind the trencher is removed. The ceiling A method of opening between tunnels, comprising dismantling and removing each piece, and thereafter connecting lower ends of left and right sides of a lining body of an upper tunnel and upper ends of left and right sides of a lining body of a lower tunnel by joint means. 2. The dismantling device is formed in a gate shape by a horizontal structure disposed above a rail, and a main column for supporting the horizontal structure from front, rear, left and right, and a lower portion of the main column. The traveling means is formed so as to be able to travel on the rail, and further, a piece gripping means is vertically provided on the horizontal structure part, and the piece gripping means is movable in the horizontal structure part back and forth and right and left. The disassembly apparatus used in the tunnel opening method according to claim 1, wherein the piece gripping means is formed so as to be able to expand and contract downward, and further provided at the lower end of the piece gripping means a piece gripping portion which rotates around a vertical axis. 3. A dismantling device mounted on a rail laid in the upper tunnel, wherein a pushing member for pushing a piece forward is attached to the piece gripping portion, and the piece is attached to the horizontal structure portion. The dismantling device according to claim 2, further comprising a hoist for lifting the hoist. 4. A dismantling device mounted on a rail laid in the lower tunnel, wherein an arm which can be raised and lowered in the front-rear direction is attached to the horizontal structure, and the arm moves inside the horizontal structure. 3. The disassembly apparatus according to claim 2, wherein the disassembly apparatus is formed so as to be movable back and forth and left and right, and is capable of holding the joint means at a tip of the arm.