JPH10184281A - Joint structure among segment and segment made of steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of connecting sections, and to improve the efficiency of the execution of works by a method wherein the end faces of the main girders of the adjacent segments of a shield tunnel are abutted, and connecting plates are disposed on each both side of flanges and webs and bolted. SOLUTION: Connecting plates 35 are inserted among webs 23, 23, and the bolts 27 of both welding sections 25a and projecting sections 25b of segments 20 made of steel are applied to the internal-surface side joint sections of flanges 22, 22 while being inserted into boltholes 36, and clamped by nuts. Both flanges 22, 22 are coupled by the connecting plates 25 and 35. Other connecting plates 37, 37 are applied to both sides of the joint sections among the webs 23, 23. The boltholes 38 of the connecting plates 37 and the boltholes 24 of the webs 23 are conformed and bolted, and the webs 23, 23 are connected. Accordingly, both main girders 21, 21 are bridged by the connecting plates 25, 35, 37 in joint structure among the segments by the segments 20 made of steel, and bolted while interposing the flanges 22 and the webs 23, thus increasing joint strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel segment and an inter-segment joint structure constituting a lining body of a shield tunnel in an outer shell shield tunnel construction method, and particularly to a rectangular or L-shaped front view. The present invention relates to a steel segment and an inter-segment joint structure when a deformed shield tunnel having a non-circular cross section is applied to each shield tunnel.

[0002]

2. Description of the Related Art An outer shell shield tunnel construction method is a construction method applied to construction of a large-section tunnel. As shown in FIG. 21, small-section shield tunnels 1, 1... (See Japanese Patent Laid-Open No. 4-3096).
92, 309693, etc.).

[0003]

As shown in FIG. 22, in the case of a general circular shield tunnel 2, since the earth pressure acts as a uniform compressive force over the entire circumference of the lining body, the distance between the segments increases. There is almost no tensile stress acting on the joints 3, 3,. Therefore, the joint strength is rarely a problem.

On the other hand, the aforementioned shield tunnels 1, 1...
As described above, in the outer shell leading shield tunneling method, a rectangular or L-shaped deformed shield tunnel is often used as each shield tunnel. In such a variant shield tunnel, for example, a rectangular shield tunnel 4 shown in FIG.
As described above, the earth pressure acts as a bending stress on the lining body. Then, as shown by the two-dot chain line in the figure, each straight line portion is going to be recessed inward. Therefore, a tensile stress always acts on the inter-segment joints 5, 5,..., And joint strength that can oppose the tensile stress is required.

Incidentally, the conventional inter-segment joint of the lining body of the shield tunnel has a structure in which end plates on the inter-segment joint surface of both segments to be connected are bolted together. Therefore, the joint strength can be increased by increasing the number of bolts, but the size of the end plate is limited, so that the number of bolts that can be increased is also limited.

[0006] In the conventional outer shell leading shield tunnel construction method shown in FIG.
After constructing ..., ground improvement work and mountain retaining work are performed on both sides of the gap 6, and then the adjacent shield tunnels 1 and 1 are opened and connected. There is also a problem with the rigidity of the connecting portion.

[0007] In order to improve the strength of the inter-segment joint of each shield tunnel, the strength of the connection between adjacent shield tunnels is improved, and the construction efficiency of the outer leading shield tunnel method is improved. A technical problem to be solved arises, and an object of the present invention is to solve the problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and is an inter-segment joint of a steel segment constituting a lining body of a shield tunnel in a shell leading shield tunnel construction method. The main girder of the steel segment is composed of a flange and a plurality of webs erected on the inner surface of the flange, and the main girder end faces of adjacent steel segments are abutted with each other. A connecting plate for bridging the main girder is provided on both sides of the flange and on both sides of the web, and an inter-segment joint structure is provided in which the connecting plates on both sides and the main girder sandwiched between the connecting plates on both sides are bolted. Things.

[0009] A connecting plate on the rear side for connecting to the flange of the succeeding steel segment is protruded from the end face of the inter-segment joint with the succeeding steel segment. Bolt to connect with the flange of
The present invention provides a steel segment planted in a state of protruding inward from the rear surface of the rear connection plate.

[0010] Further, in the steel segment, the steel segment excluding the rear portion of the back side connecting plate and the portion of the rear side connecting plate for connecting with the flange of the preceding steel segment. And a steel segment in which a skin plate is covered on the back of the flange and a sealing material is provided around the peripheral edge of the skin plate.

[0011] Also, a steel segment disposed at a corner portion of the preceding shield tunnel that is connected to the succeeding shield tunnel, and is connected to a flange of the following steel segment. A rear-side connecting plate protrudes from an end face of an inter-segment joint with a subsequent steel segment, and bolts for connecting to a flange of the following steel segment are provided on the rear surface of the rear-side connecting plate. In addition to being planted in a state of projecting inward from the back, the back of the connecting plate on the back side and the back for connecting the flange of the steel segment to the flange of the steel segment of the following shield tunnel. A skin plate is mounted on the back of the flange of the steel segment except for the portion where the inter-tunnel connecting plate is provided, and a sealing material is provided around the peripheral edge of the skin plate. There is provided a steel segments FutaSo a removable cover arranged partial rear side of the tunnel between the connecting plate and the shield tunnel end face of the line after the main girder.

[0012] Further, a steel segment disposed at a corner portion on a side connected to a preceding shield tunnel in a succeeding shield tunnel, for connecting to a flange of the following steel segment. A rear-side connecting plate protrudes from an end face of an inter-segment joint with a subsequent steel segment, and bolts for connecting to a flange of the following steel segment are provided on the rear surface of the rear-side connecting plate. In addition to being planted in a state of projecting inward from the front, the rear tunnel connecting plate for connecting the flange of the steel segment and the flange of the steel segment of the preceding shield tunnel is connected to the preceding shield. For projecting from the joint end face with the steel segment of the tunnel, and connecting the flange of the steel segment to the flange of the steel segment of the preceding shield tunnel. And a rear end of the steel segment is covered with a skin plate, and a peripheral end of the skin plate. An object of the present invention is to provide a steel segment in which a sealing material is provided around an edge.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
20 through FIG. First, an outline of the outer shell shield tunneling method will be described with reference to FIGS. As shown in FIG. 1, when constructing a large-section tunnel 10, first, an L-shaped section shielding machine 1
At step 1, an L-shaped shield tunnel 12, 12, 12, 12 is constructed. The L-shaped section shield machine 11 is formed by combining three rectangular section shield machines into an L-shape. By thus integrally forming each corner portion of the large-section tunnel 10 with one L-shaped shield tunnel 12, a connection portion between the shield tunnels can be eliminated from the corner portion, and the corner portion can be removed. The structural strength is improved.

Next, as shown in FIG. 2, a rectangular section shield machine 13 is provided between the opposed L-shaped shield tunnels 12 and 12.
To construct a rectangular shield tunnel 14 or a rectangular cross-section shield machine 15 to construct a rectangular shield tunnel 16. The rectangular shield machine 15 has two rectangular shield machines arranged side by side so that one rectangular shield tunnel 16 can be integrally constructed.

Next, as shown in FIG. 3, a vertical H-shaped shield machine 17 or a horizontal H-shaped shield machine 18 is introduced between the L-shaped shield tunnel 12, the rectangular shield tunnel 14 and the rectangular shield tunnel 16. , And construct a filling shield tunnel 19. In this way, these shield tunnels 12, 14, 16, and 19 are annularly connected and integrated. The specific configuration of the vertical H-section shield machine 17 and the horizontal H-section shield machine 18 will be described later.

Next, as shown in FIG. 4, a reinforcing member is appropriately disposed in the bore of the connected and integrated shield tunnels 12, 14, 16, and 19, and concrete is poured and filled, and an outer peripheral body 10a of the large-section tunnel 10 is filled. To form After that, the earth and sand inside the outer frame 10a is excavated and discharged to construct the floor slab 10b, the partition 10c, and the like.

FIG. 5 shows a steel segment 20 used for the lining of these shield tunnels 12, 14, 16, and 19, and a main girder 21 of the steel segment 20 is formed on the inner surface of a flange 22 (see FIG. ) And (c), a plurality of webs 23, 23, 23, 23 are erected on the lower surface to form a comb-like shape. Bolt holes 24, 24,... Are formed in the vicinity of the end faces (both left and right end faces in FIGS. 7A and 7B) of the joint between the segments of the flange 22 and the webs 23, 23, 23, 23, respectively. ing.

Also, the rear surface (the upper surface in FIGS. 3B and 3C) of the end face side of the joint with the succeeding segment in the flange 22 (the left side in FIGS. 3A and 3B). Just the half of the connecting plate 25 is welded (welded portion 25a), and the other half of the connecting plate 25 projects horizontally from the joint end face (projecting portion 25b). As shown in FIG.
The connecting plate 25 is provided with bolt holes 26, 26,..., And all the bolt holes 26, 26,.
7, 27... Are inserted from the back,
The bolts 27, 5a of 5a protrude inward, while also passing through the bolt holes 24, 24 ... of the flange 22. The heads of these bolts 27 are welded to the connecting plate 25 so as to be implanted and fixed to the connecting plate 25.

Further, a skin plate 29 is mounted on the back of the flange 22 and the connecting plate 25 via a spacer 28. This skin plate 29 is used for the shield machine 11,
13, 15, 17, and 18 are for ensuring the waterproofness of the tail portions. That is, without the skin plate 29 and the flanges 22 and the connecting plate 25 being exposed, the wire brushes of the shield machines 11, 13, 15, 17, and 18 make the back surface of the lining body made of the steel segment 22 disappear. This is because, when rubbing, the wire brush is scraped up by the step between the flange 22 and the connecting plate 25 and the heads of the bolts 27, 27.

The skin plate 29 is provided with a flange 2
2 is formed to have the same dimensions in plan view, and one end edge is aligned with the tip end edge of the projecting portion 25b of the connection plate 25. Therefore, the joint end face side (the right side in FIGS. 7A and 7B) with the preceding segment on the back surface of the flange 22 is exposed by the size corresponding to the projecting portion 25b (the right side in FIGS. Exposed part 22a).

The skin plate 29 and the flange 2
2 and a connecting material 25 such as mortar
Is filled. Further, a water-swellable sealing material 31 is provided around the peripheral edge of the skin plate 29. This seal material 31 is for ensuring the water stopping performance of the joint between the segments and the joint between the rings of the lining body constructed of the steel segments 20.

Reference numeral 32 in the figure denotes a grout socket for backfill injection, reference numeral 33 denotes a reinforcing rib for receiving a reaction force of the propulsion jack, and reference numeral 34 denotes a suspending metal fitting for an elector. FIG. 7 shows the manner in which the steel segments 20 are connected to each other in the circumferential direction of the tunnel, and the following segment of the main girder 21 of the steel segment 20 (the steel segment 20 on the right side in the figure) installed in advance. While abutting the end face of the leading joint side of the main girder 21 of the succeeding steel segment 20 against the end face of the side joint, the following steel segment 20 is lifted upward in the drawing, and the projecting portion 25b of the preceding steel segment 20 is raised.
Are inserted into the bolt holes 24 of the exposed portion 22a of the succeeding steel segment 20. As a result, as shown in FIG. 8, the projecting portion 25 of the preceding steel segment 20 is placed on the exposed portion 22a of the succeeding steel segment 20.
b fits, and both skin plates 29, 29 are continuous.

Thereafter, the connecting plate 35 also shown in FIG.
8 is inserted into the gap between the web 23 at the back of the figure and the web 23 at the front of the figure (not shown) from below the paper surface in FIG. 8, and the preceding steel segment 20 is inserted into the bolt holes 36, 36.
Bolts 27, 2 of both the welded portion 25a and the protruding portion 25b
7 are applied to the joints on the inner surface side of the flanges 22, 22 while being inserted. Then, nuts are mounted on the ends of the bolts 27 projecting downward from the paper of the connecting plate 35 and tightened. Thus, the two flanges 22, 22 are connected via the connecting plate 25 on the rear side and the connecting plate 35 on the inner side.

The reason why the connecting plate 25 on the rear side and the bolts 27, 27... Used for connecting the flanges 22, 22 are fixed to the preceding steel segment 20 in advance is as shown in FIG. Steel segment 2 as shown
0 is lined along the inner surface of the outer periphery of the shield machines 11, 13, 15, 17, 18 so that there is almost no room in the back space of the steel segment 20, and these back side connecting plates 2
5 and bolts 27, 27... Cannot be installed at the lining site.

Next, the other connecting plates 37, 37 are connected to the web 2
Apply to both sides of 3, 23 joints. As shown in FIG. 6C, bolt holes 38, 38,... If these bolt holes 38, 38 are aligned with the bolt holes 24, 24 ... of the web 23 and tightened by bolts, both webs 23, 23
7, 37 are connected. Thus, the succeeding steel segment 20 is connected to the preceding steel segment 20.

As described above, the inter-segment joint structure using the steel segments 20 is a structure in which the two main girders 21 and 21 are bridged by the connecting plates 25, 35 and 37, and the connecting plates 25, 35 and 37 are arranged on both sides of the flange 22 and the web 23, respectively.
Since the bolts are clamped while sandwiching the end plate 3, the joint strength can be increased as much as possible in comparison with a conventional end plate type joint structure in which strength is maintained only by bolts connecting the end plates.

As shown in FIG. 9, the inter-ring joint in the direction of the tunnel tunnel has a web 23 at the outer end (left end in the figure) of the steel segment 20 in the preceding ring on the right side of the drawing. Then, a web 23 at the outer end (right end in the figure) of the steel segment 20 in the succeeding ring on the left side of the drawing is superimposed on the two webs 2.
3 and 23 are sandwiched between the connecting plates 37 and 37 and bolted.

A steel segment 20A shown in FIG. 10 is a steel segment provided at the corner of the L-shaped shield tunnel 12, the rectangular shield tunnel 14, and the rectangular shield tunnel 16 on the side connected to the filling shield tunnel 19. Segment. The protruding portion 25b side of the steel segment 20A has the same configuration as that of the steel segment 20. The upper right corner of the steel segment 20A on the exposed portion 22a side just forms a tunnel corner. A cover 39 is previously mounted on the upper right corner of the drawing. The cover 39 has such a shape that the vicinity of the protruding portion 25b is cut off. That is, bolts 41, 41,... Are planted on a flat plate 40 corresponding to the protruding portion 25b, and a portion of the web 23 corresponds to a tunnel corner end (right end in the drawing) of the flat plate 40. Blades 42 are provided vertically, and a skin plate 43 shaped like a letter in a side view is mounted on the back of these blades.

When the bolts 41 are inserted into the bolt holes 24 of the exposed portion 22a, FIG.
As shown in FIG. 1A, the flat plate 40 is fitted on the exposed portion 22a, and the skin plate 29 of the steel segment 20A and the skin plate 43 of the cover 39 are continuous.
Bolts 41, 41 penetrating through the bolt holes 24, 24 ...
Nuts are attached to the tips of…. In addition, the blade 42 is superimposed on the end of the corner of the tunnel of the web 23 (the right end in the figure), and both bolt holes 24 and 44 penetrate. Thereby, the main girder 2
One tunnel corner end is closed.

Further, in the steel segment 20A, an end plate 45 is provided at the leading edge (lower edge in the figure) of the web 23 and at the tunnel corner end.
The end plate 45 is for connecting the column / beam segments 46. As shown in FIG. 3B, an H-shaped steel member 47 is disposed at the center of the column / beam segment 46, and U-shaped steel members 48, 48 are disposed on both left and right sides, and the outer surface ( A detachable skin plate 49 is provided on the upper surface (in the figure).

As shown in FIG. 4, this column / beam segment 46 is buried inside the outer peripheral frame 10a of the tunnel 10 having a large cross section, and for those arranged on the ceiling frame and the floor frame, the ceiling frame is used. And the pillars of the floor frame,
Those arranged on the side skeleton constitute beams of the side skeleton, and those arranged on any side receive only axial force and do not receive bending force. Therefore, there is no problem even if the joint structure with the column / beam segment 46 is an end plate type.

FIGS. 12 to 14 show the procedure for lining the corners of the L-shaped shield tunnel 12, the rectangular shield tunnel 14, and the rectangular shield tunnel 16 on the side connected to the filling shield tunnel 19. It is a thing.
First, as shown in FIG. 12, the column / beam segment 46 is erected (or erected), and then, as shown in FIG.
The steel segment 20A with the cover 39 is connected to the beam segment 46 by an end plate method. Next, as shown in FIG. 14, the steel segment 20 </ b> A is set as a preceding steel segment, and the subsequent steel segment 20 is connected via connecting plates 25, 35, and 37.

The steel segment 20B shown in FIG. 15 is located at the corner of the space-filled shield tunnel 19, that is, at the portion connected to the L-shaped shield tunnel 12, the rectangular shield tunnel 14 or the rectangular shield tunnel 16 constructed earlier. A steel segment to be disposed;
An L-shaped shield tunnel 12, a rectangular shield tunnel 14, or a rectangular shield tunnel 16 is connected to the left side of the paper of FIG. On the other hand, since the following steel segment 20 is connected to the right side of the steel segment 20B in the drawing, the right side of the steel segment 20B in the drawing has the same configuration as the protruding portion 25b side of the steel segment 20. ing.

The rear side (the upper surface in the figure) of the end of the flange (22) of the steel segment 20B connected to the preceding tunnel (ie, the left end in the figure) is connected between the tunnels. Just half of the plate 50 is welded (weld 50a),
The other half of the inter-tunnel connecting plate 50 is
(Projecting portion 50b). Further, bolts 51, 51,... Are inserted into the inter-tunnel connecting plate 50 from the back thereof similarly to the connecting plate 25,
(The bolts 51, 51,... Of the welded portion 50a also project inward while also penetrating the flange 22). The heads of these bolts 51, 51... Are welded to the inter-tunnel connecting plate 50, respectively.
It is implanted and fixed to the inter-tunnel connecting plate 50.

Further, the skin plate 52 in the steel segment 20B is mounted on the entire back of the steel segment 20B. A sealing material 3 is provided on the peripheral edge of the skin plate 52 similarly to the skin plate 29.
1 is provided around.

FIG. 16 shows a horizontal H-shaped section shield machine 1.
FIG. 8 shows a state where the tunnel is excavated between the L-shaped shield tunnel 12 and the rectangular shield tunnel 16. As shown in FIG. 3 and FIG. 3, the upper and lower sides of the outer side of the horizontal H-shaped shield machine 18 project vertically from the upper and lower edges of the L-shaped shield tunnel 12 and the rectangular shield tunnel 16 and protrude in the left-right direction. The protruding portion 53 is provided between the L-shaped shield tunnel 12 and the rectangular shield tunnel 1.
6 at the corners. As shown in FIG. 17, an opening 54 is formed at the left and right rear portions of the outer periphery of the horizontal H-shaped shield machine 18, and a sealing material 55 is provided around the inner peripheral surface of the opening 54. , The sealing material 55 is the L-shaped shield tunnel 12 and the rectangular shield tunnel 1
6 by tightly contacting the back surface of the lining body.
The water is stopped.

Further, as shown by a two-dot chain line in FIG. 7 (b), the horizontal H-type shield machine 18 itself is configured so as to be able to widen in the left-right direction.
The mold section shield machine 18 is provided with a copy cutter or the like so that it can not only excavate along the contour of the outer shell in a front view but also can perform widening excavation in the left-right direction. Due to these widening functions, regardless of the construction error of the L-shaped shield tunnel 12 and the rectangular shield tunnel 16, excavation of earth and sand between the L-shaped shield tunnel 12 and the rectangular shield tunnel 16 to the back of the lining body of both tunnels. Can be excavated. Then, from the left and right openings 54, 54, the back surface of the lining body on the column / beam segment 46 side in the L-shaped shield tunnel 12 and the rectangular shield tunnel 16 is exposed. That is, in the rear lumen of the horizontal H-shaped section shield machine 18,
The skin plate 49 of the column / beam segment 46 and the skin plates 43 of the covers 39 at the upper and lower ends thereof are exposed.

Therefore, as shown in FIG. 18, the entire cover 39 and the skin plate 49 of the column / beam segment 46 are provided.
And remove. Then, as shown in FIG. 19, while the edge of the web 23 of the steel segment 20B is brought into contact with the edge of the web 23 of the steel segment 20A, the bolts 51, 51. To the bolt hole 24 of the exposed portion 22a of the steel segment 20A,
24 ... Thereby, the steel segment 20A
Projecting portion 50 of steel segment 20B on exposed portion 22a of
b is fitted so that both skin plates 29 and 52 are continuous with each other.

Thereafter, as shown in FIG. 20, another inter-tunnel connecting plate 56 is inserted from below into the gap between the web 23 at the back of the figure and the web 23 at the front of the figure (not shown), and the bolt hole is made of steel. The bolts 51, 51,... Of both the welded portion 50a and the protruding portion 50b of the segment 20B are inserted and applied to the inner surface side joints of the flanges 22, 22. Then, bolts 51 protruding from the inter-tunnel connecting plate 56,
Attach nuts to the tips of 51 ... and tighten them. Furthermore,
The other inter-tunnel connection plates 57 are applied to both sides of the joints of the webs 23, 23, and the bolt holes are aligned with the bolt holes 24 of the web 23 and tightened by bolts.

Thus, the steel segments 20A of the L-shaped shield tunnel 12 and the rectangular shield tunnel 16 and the steel segments of the filling shield tunnel 19 are formed by means similar to the joint means between the segments in one shield tunnel. 20B. Thereby, these lining bodies can be rigidly connected to each other, and the rigidity of the connecting portion can be increased as much as possible. In addition, since the inter-tunnel connection work is performed at the same time as constructing the lining body of the filling shield tunnel 19, it is extremely efficient and safe.

The vertical H-section shield machine 17 introduced between the L-type shield tunnel 12 and the rectangular shield tunnel 14 has a shape obtained by raising the horizontal H-section shield machine 18 by 90 degrees. The procedure for connecting the L-type shield tunnel 12 and the rectangular shield tunnel 14 while constructing the filling tunnel 19 using the vertical H-section shield machine 17 uses the horizontal H-section shield machine 18 described above. The procedure is the same as the procedure for constructing the filling shield tunnel 19 between the L-shaped shield tunnel 12 and the rectangular shield tunnel 16.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

[0043]

As described above, according to the present invention, the joint strength between the segments can be increased as much as possible, and the bending stress due to the earth pressure can be sufficiently resisted. Similarly, the strength of the connection between adjacent shield tunnels can be increased as much as possible, so that these linings are sufficient to be used as main stress members for the outer frame of the large-section tunnel. Rigidity can be secured.

Further, since the connecting operation between the tunnels is performed in the same procedure as the connecting operation between the segments simultaneously with the construction of the shield tunnel to be described later, the construction efficiency is improved.

According to the second aspect of the present invention, the backside connecting plate and the bolts are attached to the preceding steel segment in advance, so that there is no room in the backside space of the lining body. Connection work can be easily performed.

Further, according to the third to fifth aspects of the present invention, it is possible to ensure the waterproofness of the tail portion of the shield machine during the shield excavation, and to make the joint between the segments and the rings between the linings. The water stoppage can also be secured.

[Brief description of the drawings]

FIG. 1 is a front cross-sectional explanatory view of a large-section tunnel constructed by an outer precedence shield tunnel method according to the present invention;
FIG. 4 is an explanatory front sectional view at the stage when an L-shaped shield tunnel is constructed.

FIG. 2 is an explanatory front sectional view at a stage when a rectangular shield tunnel and a rectangular shield tunnel are constructed from the state of FIG. 1;

FIG. 3 is an explanatory front cross-sectional view at the stage when a filling shield tunnel is constructed from the state of FIG. 2;

FIG. 4 is an explanatory front sectional view of the completed large section tunnel.

5A and 5B show one embodiment of a steel segment according to the third aspect of the present invention, wherein FIG. 5A is a plan view thereof, FIG. 5B is a sectional view taken along line AA of FIG. It is a BB sectional view taken on the line of (a).

FIG. 6A is a plan view of a rear connection plate for connecting flanges. (B) A plan view of an inner side connecting plate for connecting between flanges. (C) A plan view of a connecting plate for connecting webs.

FIG. 7 is a front sectional view in a process of connecting a succeeding steel segment to a preceding steel segment.

FIG. 8 is a front sectional view showing an embodiment of the invention described in claim 1.

FIG. 9 is a side sectional view showing the joint structure between rings.

FIG. 10 is a front sectional view showing one embodiment of a steel segment according to the invention of claim 4;

FIG. 11 (a) is an exploded front sectional view of a steel segment and a column / beam segment according to the invention of claim 4. (B) The end view at CC line of (a).

FIG. 12 is a front sectional view showing a lining process of a corner portion on a side connected to a filling shield tunnel in an L-shaped shield tunnel, a square shield tunnel, and a rectangular shield tunnel, and covers a column / beam segment. FIG. 3 is a front sectional view at the stage of construction.

FIG. 13 is a front sectional view at the stage where the steel segment according to the invention of claim 4 is lining from the state of FIG. 12;

FIG. 14 is a front cross-sectional view at the stage when the steel segment according to the third aspect of the present invention is covered from the state of FIG. 13;

FIG. 15 is a front sectional view showing one embodiment of the steel segment according to the invention of claim 5;

FIG. 16 is an explanatory view of a main part of a front cross-section showing a process of constructing a filling shield tunnel between the L-shaped shield tunnel and the rectangular shield tunnel, in a state where the back of the lining body of the L-shaped shield tunnel and the rectangular shield tunnel is exposed; FIG.

FIG. 17 (a) is a side explanatory view of an outer shell of a horizontal H-shaped shield machine. (B) Rear view explanatory view of the outer shell of the horizontal H-section shield machine.

FIG. 18 is an explanatory view of an essential part of the front cross section at the stage of removing the entire cover and the skin plate of the column / beam segment from the state of FIG.

FIG. 19 is an explanatory view of a main part of a front cross section in the process of connecting the steel segment according to the fifth aspect of the invention to the steel segment according to the fourth aspect from the stage of FIG.

FIG. 20 is an explanatory view of a main part of a front cross section of a connecting portion between shield tunnels.

FIG. 21 is an explanatory front cross-sectional view showing a stage before opening between the shield tunnels in a large-section tunnel constructed by the conventional outer shell leading shield tunnel method.

FIG. 22 is an explanatory front sectional view of a circular shield tunnel.

FIG. 23 is an explanatory front sectional view of a rectangular shield tunnel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Large section tunnel 12 L-shaped shield tunnel 14 Rectangular shield tunnel 16 Rectangular shield tunnel 19 Filling shield tunnel 20, 20A, 20B Steel segment 21 Main beam 22 Flange 22a Flange exposed part 23 Web 25, 35, 37 Connecting plate 25a Welded portion of connecting plate provided on back of flange 25b Protruded portion of connecting plate provided on back of flange 27 Bolt attached to connecting plate provided on back of flange 29,52 Skin plate 31 Sealing material 39 Cover 50,56,57 Inter-tunnel connecting plate 50a Welded portion of inter-tunnel connecting plate provided on back of flange 50b Projected portion of inter-tunnel connecting plate provided on back of flange

Claims (5)

[Claims] Claims: 1. An inter-segment joint structure of a steel segment constituting a lining body of a shield tunnel in an outer shell leading shield tunnel method, wherein a main girder of the steel segment is a flange, and an inner surface of the flange. A plurality of webs erected on the same side, butting the main girder end faces of adjacent steel segments, and arranging connecting plates bridging both main girders on both sides of the flange and on both sides of the web, An inter-segment joint structure, characterized in that connecting plates on both sides thereof and a main girder sandwiched between the connecting plates on both sides are bolted. 2. A rear-side connecting plate for connecting to a flange of a subsequent steel segment protrudes from an end face of an inter-segment joint with a subsequent steel segment, and the subsequent steel segment. 2. The steel segment according to claim 1, wherein bolts for connecting to the flanges are implanted so as to protrude inward from the rear surface of the connecting plate on the rear surface side. 3. A skin plate is provided on the back of the steel segment flange except for the portion of the back of the back side connection plate and the portion of the back side connection plate for connecting with the flange of the preceding steel segment. 3. The steel segment according to claim 2, wherein the skin segment is covered and a sealing material is provided around the peripheral edge of the skin plate. 4. A steel segment disposed at a corner portion of a preceding shield tunnel that is connected to a succeeding shield tunnel, the steel segment comprising: a back portion of the rear connection plate;
And a skin plate on the back of the flange of the steel segment, except for the portion of the rear side inter-tunnel connecting plate for connecting the flange of the steel segment and the flange of the steel segment of the subsequent shield tunnel. Dressed up,
And a sealing material is provided around the peripheral edge of the skin plate, and a portion where the rear-side tunnel connecting plate is provided,
3. The steel segment according to claim 2, wherein a detachable cover is mounted on an end face on the shield tunnel side of the trailing side of the main girder. 5. A steel segment disposed at a corner portion of a succeeding shield tunnel connected to a preceding shield tunnel, wherein a flange of the steel segment and a steel of the preceding shield tunnel are provided. A rear-side tunnel connecting plate for connecting the flange of the segment made of steel is protruded from the joint end face of the steel segment of the preceding shield tunnel and the flange of the steel segment and the tunnel of the preceding shield tunnel. Bolts for connecting the flanges of the steel segments are implanted in a state protruding inward from the back of the inter-tunnel connection plate on the back side, and the entire back of the steel segments is covered with a skin plate. 3. The steel segment according to claim 2, wherein a seal material is provided around the peripheral edge of the skin plate.