JPH089955B2 - Vertical double shield tunnel segment lining structure and its construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a segment lining structure of a vertical double shield tunnel used as a railway tunnel, a road tunnel and the like, and a construction method thereof.

[Conventional technology]

When excavating tunnels such as railway tunnels and road tunnels by the shield method, there are two
A method of arranging and arranging two single-line tunnels independently in the lateral direction, or a method of digging one circular tunnel having a large cross section is adopted.

In the case of the former method, if two single-line tunnels are installed side by side, the land occupation width at the top of the tunnel will become wider,
There is a problem that tunnel construction only under the road becomes impossible and land acquisition other than road is required. In the case of the latter method, the land width above the tunnel is not required as much as the former method, but the tunnel cross section becomes significantly large, and dead spaces occur at the upper and lower parts of the tunnel cross section. Is uneconomical because it will be backfilled with concrete.

Recently, as a method of constructing a double-track tunnel that can solve these problems, a shield tunnel having a cross-sectional shape in which a part of the cross-sections of two single-track tunnels arranged side by side in the lateral direction are overlapped is proposed and implemented.

However, in the case of a shield tunnel having a cross-sectional shape in which the cross-sections of two single-line tunnels lined up in the horizontal direction are overlapped, compared to the case where two single-line tunnels are separated and installed side by side, Only the width is slightly reduced, and the land occupation width above the tunnel is not reduced so much. Therefore, it is not possible to construct a combined left and right shield tunnel under a narrow road.

Therefore, as a shield tunnel of an upper and lower composite type capable of solving the above-mentioned problems, as disclosed in Japanese Patent Laid-Open No. 60-141993, an upper notched circular lower tunnel body composed of a connecting body of several segment pieces. The upper end of
2. Description of the Related Art There is known a combined upper and lower shield tunnel in which a lower cutout circular upper tunnel body consisting of a connected body of several segment pieces and a lower single part of the upper tunnel body are joined with a horizontal partition segment interposed therebetween.

Further, as disclosed in Japanese Patent Laid-Open No. 64-33398, an upper cut-out circular segment connecting body for a lower tunnel composed of a connecting body of several segment pieces and a lower connecting body composed of a connecting body of several segment pieces. A notched circular segment connecting body for the upper tunnel is arranged at intervals in the vertical direction, and both end portions of each segment connecting body have a joining segment with an upper long blade version and a lower short blade version, and a lower long blade. The upper and lower wing plates and the joining segment with the lower long wing plate and the lower long wing plate are joined together through a joining segment with the plate and the upper short wing plate to form an upper and lower composite segment ring. And the joining segment with the upper short blade version are alternately arranged in the tunnel longitudinal direction,
There is also known an upper and lower combined type shield tunnel in which a supporting member such as a beam or a floor slab is erected and fixed over the left and right joining segments.

[Problems to be Solved by the Invention]

In the case of the conventional shield tunnels of upper and lower combined type, the segments are assembled in the following order: cement for the lower tunnel, then segment for joining, then beam or horizontal partition segment, and then segment for upper tunnel. Since the larger the tunnel cross section, the more time it takes to assemble the segment ring, the construction efficiency will decrease and the number of segment divisions will increase.
The number of segment ring-to-piece joints and the number of ring-to-ring joints increase, so that as the assembly progresses from the first assembled segment piece, the assembly error gradually accumulates, and finally the insertion of the key segment is It can be difficult. Further, since the lower tunnel segment and the upper tunnel segment are assembled at the same position in the longitudinal direction of the tunnel, there is a risk that a container may drop from the upper tunnel during the assembling work of the lower tunnel segment.

The present invention, when assembling a lower notched circular upper segment ring and an upper notched circular lower segment ring, joins an upper arm joint segment located in one of the left and right directions and a lower arm joint segment located in the other of the left and right directions. The assembly of the lower cut-out circular upper segment ring and the upper cut-out circular lower segment ring is performed in parallel by precedingly assembling the work segment and the intermediate floor slab segment arranged between the joining segments. Vertical shield tunnel segment lining structure that can be assembled safely and safely, can shorten the assembly work time, and can easily assemble the high-precision vertical double shield tunnel segment lining. And its construction method.

[Means for solving the problem]

In order to achieve the above object, in the construction method of the segment lining of the vertical double shield tunnel of the present invention. The joining segment 6 with the upper arm and the joining segment 7 with the lower arm are arranged at an interval in the left-right direction, and both ends of the intermediate floor slab segment 8 are joined to the joining segments 6 and 7, respectively. An upper cutout circular lower segment ring 1 including the key segment 5 is assembled and connected to the lower ends of the joining segments 6 and 7, and a lower cutout circle including the key segment 5 is provided at the upper end of each joining segment 6 and 7. The upper segment rings 2 are assembled and connected, and the plurality of positioning pins 10 fixed to one joining segment adjacent in the tunnel longitudinal direction are inserted into the plurality of pin holes 20 provided in the other joining segment. .

Further, in the segment lining structure of the vertical double shield tunnel of the present invention, the joining segment 6 with the upper arm is used.
And joining segments with lower arms 7 are arranged at intervals in the left-right direction, and both ends of the intermediate floor slab segment 8 are joined to the joining segments 6 and 7, respectively.
An upper notched circular lower segment ring 1 including a key segment 5 is assembled and connected to lower ends of 6,7, and a lower notched circular upper segment including the key segment 5 is connected to upper ends of the joining segments 6,7. The rings 2 are assembled and connected, and a plurality of positioning pins 10 fixed to one joint segment adjacent in the tunnel longitudinal direction are inserted into a plurality of pin holes 20 provided in the other joint segment.

Further, in order to safely carry out the assembly work of the lower segment ring, the assembly work of either the lower segment ring 1 or the upper segment ring 2 is carried out in advance.

Furthermore, in order to quickly and accurately join the left and right joining segments and the ends of the intermediate floor slab segments,
A vertical connecting pin 13 fixed to one of the upper arm joining segment 6 and the lower arm joining segment 7 and the intermediate floor slab segment 8 is inserted into a vertical pin hole 22 provided in the other.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

4 to 6 show the joining segment 7 with a lower arm used in the first embodiment, in which the width of the segment body 25 (in the tunnel longitudinal direction) is provided outside the lower portion of the concrete segment body 25. Width) and a lower arm 26 made of concrete having the same width as that of the segment main body 25, and a joint surface 12 to be joined to the lower end surface of the upper segment ring of the lower cut circular shape is provided at the outer upper end portion of the segment body 25. , A groove-shaped joint fitting 14 having a bolt hole is embedded and fixed, a key segment joining surface 11 is provided at the lower end portion of the lower arm 26, and the groove-shaped joint fitting 14 is embedded and fixed, and A concrete floor slab support arm 27 is integrally provided inside the main body 25, the lower part of the vertical connecting pin 13 is embedded and fixed to the upper part of the floor slab support arm 27, and provided on the tip side of the connecting pin 13. You ’re the male A protective cap 47 having a frustoconical tip portion is screwed into the threaded portion, and at a higher level than the floor slab support arm 27, inside the segment body 25, a groove-shaped joint fitting 28 having a bolt hole is formed. Is embedded and fixed.

A positioning pin 10 that extends in the front-rear direction and has a tapered tip on both the upper and lower sides of the front portion of the segment body 25.
The base end portion of the connecting pin 9 extending in the front-rear direction is embedded and fixed to both upper and lower sides of the front portion of the segment body 25 and the front portion of the lower arm 26. A plurality of suspender engaging fittings 18 having female screw holes are embedded and fixed in the lower portion of the main body 25. Further, pin insertion fittings 29 having pin holes 20 for inserting the positioning pins 10 are embedded and fixed on the upper and lower sides of the rear portion of the segment body 25, and on the upper and lower sides of the rear portion of the segment body 25 and the rear portion of the lower arm 26. A pin insertion fitting 16 having a pin hole 21 into which the connecting pin 9 is inserted is embedded and fixed.

FIG. 7 to FIG. 9 show the joining segment 6 with an upper arm used in the first embodiment, which has the same width as the width of the segment body 25 on the outer side of the upper portion of the concrete segment body 25. Concrete upper arm 30
Are integrally connected to each other, a joining surface 31 joined to an upper end surface of an upper notched circular lower segment ring is provided at an outer lower end portion of the segment body 25, and a lower notch is provided at an upper end portion of the upper arm 30. A joining surface 12 to be joined to the lower end surface of the circular upper segment ring is provided, and the segment body is further provided.
A plurality of suspender engaging fittings 18 having female screw holes are embedded and fixed in the upper part of 25, but other configurations are the same as in the case of the connecting segment 7 with the lower arm.

10 and 11 show the intermediate floor slab segment 8 used in the first embodiment, in which a plurality of hanger engaging metal fittings 18 are embedded and fixed to the intermediate upper portion of the concrete floor slab main body 32. At the both ends of the floor slab body 32, groove-shaped joint fittings 28 having bolt holes are provided, and vertical pin holes 22 are provided.

FIGS. 1 to 3 show a lower arm joining segment 7 shown in FIGS. 4 to 6, an upper arm joining segment 6 shown in FIGS. 7 to 9, and FIGS.
11 shows a state in which the segment lining of the vertical double shield tunnel of the first embodiment is assembled using the intermediate floor slab segment 8 shown in FIG. 11 and the arcuate segment and the key segment. The segment rings having the segment arrangement shown in FIG. 1 and the segment rings having the segment arrangement shown in FIG. 2 are alternately arranged in the tunnel longitudinal direction.

Further, FIG. 12 shows a positioning connecting portion of the joining segments 6 and 7 which are adjacent to each other in the tunnel longitudinal direction in the first embodiment, and FIG. 13 is a joining segment 6 and 7 in the first embodiment.
And the intermediate floor slab segment 8 are connected to each other, and FIGS. 14 and 15 show the connection between the segments in the first embodiment.

When assembling and constructing the segment ring shown in FIG. 1, first, the joining segment 6 with the upper arm is arranged on the left side of the middle portion in the upper and lower combined type shield tunnel, and the joining segment 7 with the lower arm is arranged in the shield tunnel. Is placed on the right side of the middle floor slab, and then both ends of the middle floor slab segment 8 are placed on the concrete floor slab support arms 27 of the left and right joining segments 6 and 7, and The pin hole 22 is fitted into the connecting pin 13 of the joining segments 6 and 7, and then the protective cap 4 is inserted.
After the 7 is unscrewed from the male screw portion 48 of the connecting pin 13, the nut 44 screwed to the male screw portion 48 is tightened, and the joint fitting 28 at the end portion of the intermediate floor slab segment 8 and each joining segment 6,
7 Fittings 28 and bolts 3
Tighten by 3.

Next, a lower segment ring 1 having an upper cutout circular shape and an upper segment ring 2 having a lower cutout circular shape are assembled.

The lower segment ring 1 is assembled in the order of assembling a large number of arcuate segments 3 into an upper cutout circle that is continuous with the lower joining surface 31 of the joining segment 6 with upper arms, and then the tips of the rows of the arcuate segments 3 are assembled. , The arcuate segment 4 having the key segment joint surface 11 is connected, and then the wedge shape between the lower key segment joint surface 11 and the key segment joint surface 11 of the arcuate segment 4 in the lower arm joint segment 7 is joined. A key segment 5 having a wedge-shaped cross section is inserted and connected to the space.

In addition, the assembly order of the upper segment ring 2 is such that a plurality of arcuate segments 3 are formed in succession to the upper joint surface 12 of the upper arm joint segment 6 and the upper joint surface 12 of the lower arm joint segment 7. After assembling, the arcuate segment 4 having the key segment joining surface 11 is connected to the tip of each arcuate segment row, and then the key segment 5 is inserted in the wedge-shaped space between the key segment joining surfaces 11 of each arcuate segment 4. Insert and connect.

As shown in FIG. 15, the segments adjacent to each other in the tunnel circumferential direction are tightened and coupled by bolts 34 inserted in the joint fitting 14.

The segment ring shown in FIG. 2 is also assembled in the same order as that of the segment ring shown in FIG.
Also, the connecting pin 9 protruding from the front-rear direction end surface of one segment adjacent in the tunnel longitudinal direction is inserted into the groove-shaped pin insertion metal fitting 16 embedded and fixed in the front-rear direction end portion of the other segment, A nut 36 screwed into the male screw portion of the connecting pin 9 in the pin insertion fitting 16 tightly couples adjacent segments in the tunnel longitudinal direction. Further, the joints between the segments in the segment ring shown in FIG. 1 and the joints between the segments in the segment ring shown in FIG. 2 are not arranged in series in the tunnel longitudinal direction but are arranged in a staggered manner. There is. FIG. 12 shows the mounting state of the positioning pin 10 and the mounting state of the pin insertion metal fitting 29 in the joining segments 6 and 7, wherein the steel positioning pin 10 having a circular cross section with a taper 37 formed at its tip is shown. A steel reinforcing plate 38 is fitted and fixed by welding to an intermediate portion of the steel anchor member 39 and a steel anchor member 39 is fixed to the base end side of the pin 10 by welding.
The base end side portion of 10, the anchor member 39 and the reinforcing plate 38 are embedded and fixed in the concrete of the joining segments 6 and 7.

Further, a steel bottom plate 41 is fixed to one end of the steel cylinder 4 by welding, and a steel reinforcing plate 42 having a circular hole is fixed to the other end of the cylinder 40 by welding to form a pin hole 20. A pin insertion metal fitting 29 having a pin insertion metal fitting 29 is embedded and fixed in the concrete of the joining segments 6 and 7, and the pin 10 is inserted into the pin hole 20 of the pin insertion metal fitting 29. .

FIGS. 16 to 22 show a second embodiment of the present invention. FIGS. 16 and 17 show a joining segment 7 with a lower arm, and FIGS. 18 and 19 show an upper arm. 20 and 21 show the intermediate floor slab segment 8. The floor slab support arm 27 in the lower arm joining segment 7 and the upper arm joining segment 6 is provided with a vertical pin hole 22 and a large tightening large diameter hole 43 continuous to the lower part of the pin hole 22, The upper portions of the connecting pins 13 which are vertical to both ends of the intermediate floor slab segment 8 are embedded and fixed.

The end portion of the intermediate floor slab segment 8 is a joining segment
The connecting pins 13 fixed to the end portions of the intermediate floor slab segments 8 are inserted into the pin holes 22 of the concrete floor slab support arms 27 while being placed on the concrete floor slab support arms 27 in 6, 7, and A fixing nut 44 is screwed into a male screw provided on the lower portion of the connecting pin 13, and further, the fitting fitting 28 at the end of the intermediate floor slab segment 8 and the fitting fitting 2 of each joining segment 6 and 7 are joined.
8 and 8 are tightened and coupled by bolts 33 inserted therethrough, but the other structures are the same as in the case of the first embodiment.

23 to 32 show a third embodiment of the present invention.

27 and 28 show the connecting segment 7 with the lower arm.
The concrete segment body 25
A lower arm made of concrete 26 is integrally connected to the outer lower end of the segment main body 25, and is inclined to the inner end of the segment main body 25 so as to approach the tunnel center side from the upper side to the lower side, and from the front side to the rear side. The floor slab support slope 45 is formed so as to approach the central side of the tunnel, and the joint fitting 28 is embedded and fixed to the upper part of the floor slab support slope 45, but other configurations are the first embodiment. This is similar to the case of the joining segment 7 with the lower arm in FIG.

FIG. 29 and FIG. 30 show a joining segment with an upper arm, in which the concrete upper arm 30 is integrally connected to the outer upper end of the concrete segment main body 25, but other configurations are This is similar to the case of the joining segment shown in FIGS. 27 and 28.

31 and 32 show the intermediate floor slab segment 8, in which a plurality of hanger engaging metal fittings 18 are embedded and fixed in the upper middle portion of the concrete floor slab main body 32, and the floor slab main body 32 is shown.
At both left and right ends, an inclined end surface 46 is formed so as to approach the floor slab body center side from the upper side to the lower side, and to incline toward the floor slab body center side from the front side to the rear side. A plurality of joint fittings 28 are embedded and fixed on the upper part of 46, and further, on the rear surface (surface on the narrow side) of the floor slab main body 32, a base of a plurality of positioning pins 10 extending in the front-rear direction and having a taper at the tip. The end side is embedded and fixed, and the positioning pin 10 is provided on the front surface (wide side) of the floor slab body 32.
A pin insertion fitting 29 having a pin hole 20 for inserting is fixed.

23 to 26 are splicing segment 7 with a lower arm shown in FIGS. 27 and 28, splicing segment 6 with an upper arm shown in FIGS. 29 and 30, and FIGS.
32 shows a state in which the segment lining of the vertical double shield tunnel of the third embodiment is assembled using the intermediate floor slab segment 8 shown in FIG. 32 and the arcuate segment and the key segment. The segment rings of the segment arrangement shown in FIG. 23 and the segment rings of the segment arrangement shown in FIG. 24 are alternately arranged in the tunnel longitudinal direction. Further, the inclined end faces 46 at both ends of the intermediate floor slab segment 8 are placed on the floor slab support slopes 45 of the left and right joining segments 6 and 7, and the fitting fitting 28 at the end of the intermediate floor slab segment 8 is also placed.
And the joint fitting 28 of each of the joining segments 6 and 7 are tightened and coupled by a bolt 33 inserted therethrough.

Also in the case of the third embodiment, the segments are assembled in the same order as in the case of the first embodiment.

33 to 35 show an example of assembling and constructing a segment lining of a vertical double shield tunnel, and the numbers in the circles show the assembling order of each segment. That is, the case of FIG. 33 is an example in which the upper segment ring and the lower segment ring are assembled in parallel, and the case of FIG. 34 is an example in which the upper segment ring is assembled in advance. FIG. 35 shows an example in which the lower segment ring is assembled in advance.

FIG. 36 shows a state in which the protective cap 47 is attached to the connecting pin 13, and a male screw portion is provided on the tip side of the connecting pin 13.
A protective cap 47 made of synthetic resin or metal, which is provided with 48 and has a truncated cone-shaped tip, is screwed into the male screw portion 48, and the tip of the protective cap 47 has a square hole for engaging a rotary tool.
49 are provided.

In the case of carrying out the present invention, in order to reinforce the portion of the pin hole 22, a metal pipe is embedded in the concrete floor slab body 32 and the concrete floor slab support arm 27 at the pin hole formation planned position, and the pin is formed by the metal pipe. You may form a hole.

As means for connecting the joining segments 6 and 7, the arcuate segments 3 and 4, and the key segment 5 which are adjacent to each other in the tunnel longitudinal direction, the connecting means as shown in FIG. A means may be adopted in which a joint metal fitting is embedded and fixed in the section, and the joint metal fittings of the segments adjacent in the tunnel longitudinal direction are connected by bolts and nuts inserted therethrough.

Further, a protective cap may be screwed onto the male screw portion of the connecting pin 9 and the male screw portion of the connecting pin 13 in the second embodiment.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

Middle floor slab segment 8 of left and right joining segments 6 and 7
Assemble and first, and the left and right joining segments 6,
Rounded lower segment ring 1 with upper notch joined to 7
Since the key segment 5 is adopted for the upper segment ring 2 having the lower cutout circular shape, the lower segment ring 1 and the upper segment ring 2 can be assembled at the same time. Therefore, the segment lining of the vertical double shield tunnel can be assembled. It can be carried out quickly to shorten the construction period and reduce the construction cost, and the left and right joining segments 6 and 7 and the intermediate floor slab segment 8 which were first assembled are the lower segment ring 1 and the upper segment ring 2. Since the assembling work space is shut off, when the assembling work of the lower segment ring 1 is performed, no articles fall from the upper tunnel space to the lower tunnel space, and therefore the safety at the time of assembling the lower segment ring 1 is ensured. Can be secured, and one of the joints adjacent to each other in the tunnel longitudinal direction can be secured. Since the plurality of positioning pins 10 fixed to the segment are inserted into the plurality of pin holes 20 provided in the other joining segment, the misalignment of the joint portion in the segment rings adjacent in the tunnel longitudinal direction ( Position deviation in the direction around the tunnel) is eliminated, so that by accurately setting the first position of the vertical composite segment ring, the accuracy of the completed segment lining can be improved, and the joining segment 6, If the vertical connecting pin 13 fixed to one of the 7 and the intermediate floor slab segment 8 is inserted into the vertical pin hole 22 provided in the other, the joining segments 6, 7 on both the left and right sides are inserted.
The intermediate floor slab segment 8 can be erected and fixed to and with high precision and speed.

Furthermore, by performing the assembling work of either the lower segment ring 1 or the upper segment ring 2 in advance, the assembling work space of the lower segment ring 1 and the assembling work space of the upper segment ring 2 are vertically overlapped. Therefore, it is possible to safely perform segment assembly work.

[Brief description of drawings]

1 to 15 show a first embodiment of the present invention, and FIG. 1 is a front view showing a pair of segment rings in a segment lining of a vertical double shield tunnel, and FIG. Is a front view of the segment ring assembled adjacent to the front and rear of the segment ring of FIG. 1, FIG. 3 is a side view showing a part of the segment lining of the vertical double shield tunnel, and FIG. 4 is a lower arm A front view of the joining segment, FIG. 5 is a side view of the joining segment as seen from the inside of the tunnel, FIG. 6 is a rear view of the joining segment with a lower arm, and FIG. 7 is a front view of the joining segment with an upper arm. Figure,
FIG. 8 is a side view of the joining segment as seen from the inside of the tunnel, FIG. 9 is a rear view of the joining segment with an upper arm, FIG. 10 is a front view of a central floor slab segment, and FIG. 11 is a plan view thereof. , FIG. 12 is a cross-sectional view showing a state in which a positioning pin attached to a joining segment is opposed to a pin insertion fitting attached to the joining segment, and FIG. 13 is a joining segment and an intermediate floor slab segment. Fig. 14 is a vertical sectional front view showing a joined state of Fig. 14, Fig. 14 is a side view showing a connecting portion of adjacent segments in the tunnel longitudinal direction, and Fig. 15 is a view showing a connecting portion by joint fittings and bolts of adjacent segments in the tunnel circumferential direction. Is. 16 to 22 show a second embodiment of the present invention. FIG. 16 is a front view of a joining segment with a lower arm, and FIG. 17 is a view of the joining segment from the inside of the tunnel. Side view, FIG. 18 is a front view of a joining segment with an upper arm, FIG. 19 is a side view of the joining segment as viewed from the inside of the tunnel, and FIG. 20 is a front view of an intermediate floor slab segment,
FIG. 21 is a plan view thereof, and FIG. 22 is a vertical sectional front view showing a joined state of the joining segment and the intermediate floor segmet. 23 to 32 show a third embodiment of the present invention, and FIG. 23 is a front view showing a pair of segment rings in a segment lining of a vertical double shield tunnel, and FIG. Is a front view of the segment ring assembled adjacent to the front and rear of the segment ring of FIG. 23, FIG. 25 is a side view showing a part of the segment lining of the vertical double shield tunnel, and FIG. 26 is a joining segment. And a vertical front view showing the connection state between the intermediate floor slab segment, Fig. 27 is a front view of the joining segment with a lower arm, Fig. 28 is a side view of the joining segment as seen from the inside of the tunnel, and Fig. 29 is FIG. 30 is a front view of a joining segment with an upper arm, FIG. 30 is a side view of the joining segment as viewed from the inside of the tunnel, FIG. 31 is a front view of an intermediate floor slab segment, and FIG. 32 is a plan view thereof. 33 to 35 show an example of assembling the segment lining of the vertical double shield tunnel, and FIG. 33 shows an example of assembling the upper segment ring and the lower segment ring in parallel. FIG. 34 is a perspective view showing an example in which the upper segment ring is assembled in advance, and FIG. 35 is a perspective view showing an example in which the lower segment ring is assembled in advance. . FIG. 36 is a partially longitudinal side view showing how the protective cap is attached to the connecting pin. In the figure, 1 is a lower segment ring, 2 is an upper segment ring, 3 and 4 are arc-shaped segments, 5 is a key segment, 6 is a joining segment with an upper arm, 7 is a joining segment with a lower arm, and 8 is an intermediate floor. Plate segment, 9 is a connecting pin, 10 is a positioning pin, 11 is a key segment joining surface, 12 is a joining surface, 13 is a joining pin, 14 is a fitting fitting, 16 is a pin insertion fitting, 20 is a pin hole, and 22 is a Pin holes, 25 is a concrete segment main body, 26 is a concrete lower arm, 27 is a concrete floor slab support arm, 28 is a joint fitting,
29 is a pin insertion metal fitting, 30 is a concrete upper arm, 31 is a joint surface, 32 is a concrete floor slab body, 33 and 34 are bolts, 36 is a nut, 44 is a fixing nut, 45 is a floor slab bearing slope, 46 is an inclined end face.

Claims (4)

[Claims] 1. A joining segment 6 with an upper arm and a joining segment 7 with a lower arm are arranged at intervals in the left-right direction, and both ends of an intermediate floor slab segment 8 are joined to each joining segment 6, 7. Then, the lower segment ring 1 having an upper notched circular shape including the key segment 5 is assembled and connected to the lower end portions of the joining segments 6 and 7, and the key segment 5 is attached to the upper end portions of the joining segments 6 and 7. A plurality of positioning pins 10 fixed to one joining segment adjacent to each other in the longitudinal direction of the tunnel are assembled and connected to each other, and a plurality of pins provided on the other joining segment. Construction method for segment lining of vertical double shield tunnel to be inserted into hole 20. 2. The method for constructing a segment lining of a vertical double shield tunnel according to claim 1, wherein the assembling work of either the lower segment ring 1 or the upper segment ring 2 is performed in advance. 3. A vertical connecting pin 13 fixed to one of the upper arm connecting segment 6 and the lower arm connecting segment 7 and the intermediate floor slab segment 8 and a vertical pin hole 22 provided in the other. The method for constructing a segment lining of a vertical double shield tunnel according to claim 1, which is inserted into the. 4. An upper arm joining segment 6 and a lower arm joining segment 7 are arranged at intervals in the left-right direction, and both ends of an intermediate floor slab segment 8 are joined to each joining segment 6,7. , A lower segment ring 1 having an upper notched circular shape including a key segment 5 is assembled and connected to the lower end portions of the respective joining segments 6 and 7,
A lower notched circular upper segment ring 2 including a key segment 5 is assembled and connected to the upper ends of 6, 7 and a plurality of positioning pins 10 fixed to one of the joining segments adjacent in the tunnel longitudinal direction is the other. A vertical double shield tunnel segment lining structure that is inserted into a plurality of pin holes 20 provided in the joining segment.