JP4874076B2 - Synthetic segment - Google Patents

Description

  The present invention relates to a composite segment that is connected in the circumferential direction and axial direction of a tunnel to form a tunnel wall.

  A conventional composite segment for tunnels, a pair of axial walls along the tunnel axial direction so as to face adjacent segments in the tunnel circumferential direction, a pair of circumferential walls substantially fan-shaped along the tunnel circumferential direction, and a tunnel wall A circumferential wall along the circumferential direction of the tunnel, a box-shaped wall composed of a pair of vertical ribs having the same shape as the circumferential wall, and a portion of the circumferential wall in which the circumferential wall is arranged in the tunnel radial direction Has a flange portion projecting in the tunnel axial direction over the entire or almost the entire length of the circumferential wall of the circumferential wall on the opposite side portion to form a ductile iron segment (for example, a patent Reference 1).

  In addition, there have been proposed many connecting structures in the circumferential direction and the axial direction of the segments. As an example, the outer flange and the inner flange of the steel peripheral frame in one segment to be connected are provided with protrusions, and the other segment is connected. In the steel peripheral frame, the outer flange and the inner flange are provided with recesses for fitting the ridges, and a locking metal fitting having an insertion hole is fixed to the steel peripheral frame of one segment, and the steel peripheral edge of the other segment An insertion fitting having an insertion projection is fixed to the frame, a segment pulling guide slope is provided on the insertion projection, a pair of protrusions are fitted into the pair of recesses, and the insertion projection is inserted into the locking fitting. There is something like this (see, for example, Patent Document 2).

  In addition, the tunnel circumferential joint member is slidable in the tunnel axial direction when assembling the segment, and has a fitting concave portion and an engaging convex portion that also serve as positioning guides during assembly that fit non-slidably in and out of the tunnel. It is composed of a joint part plate-like steel material arranged in parallel or in close contact with the opposing members, and the water-stopping packing is attached to the affixing groove formed in the joint part plate-like steel material, and this water-stop packing contact There is a structure in which both joint plate-like steel materials are arranged in a water-tight manner via a gap (for example, see Patent Document 3).

JP 2003-307100 A JP-A-5-33595 Japanese Patent No. 3343090

  In the segment of Patent Document 1, the curvature of the segment is realized by cutting and welding the steel plate into a substantially fan shape, or by separately producing and installing a substantially fan-shaped cast iron. There is a problem that not only the production cost increases but also the production takes time.

  In addition, in order to withstand the concrete loading load during the production of the segments, a large number of stiffeners that suppress the out-of-plane deformation of the back plate or skin plate that constitute the peripheral wall along the circumferential direction of the tunnel are required. During the construction of the segment, since the segment is pushed in with a jack or the like, the strength of the substantially fan-shaped axial wall (segment side surface) along the circumferential direction of the tunnel becomes a problem. In particular, in the case of a tunnel segment for large depths, the pushing force of a jack or the like increases in proportion to the increase in weight per segment. In order to cope with this pushing force, it is necessary to install a large number of stiffeners, and the weight per segment further increases, resulting in a problem that workability deteriorates.

  The connecting structure of the segment of Cited Document 2 is to attach an outer flange and an inner flange with protrusions and recesses at the tip to the steel peripheral frame at both ends of the segment, and insert it into one steel peripheral frame Since the locking metal fittings with holes are fixed, and the segments are connected by fixing the insertion metal fittings to be inserted into the other metal peripheral frame to this segment. In addition to the need for manufacturing parts and attaching them to segments, it is not only costly and costly, but also the construction such as alignment is troublesome.

  Further, the steel segment structure of the cited document 3 is provided with a plurality of engaging protrusions at one end of one web of the segment, and a connecting plate having a plurality of engaging holes protruding to the other and engaging with the engaging protrusions. In addition, a connecting plate having a plurality of engaging holes is provided at one end of the other web, a plurality of engaging projections are provided at the other end, the connecting segments are shifted, and the jointed plate steel materials are brought into contact with each other. Since it is pressed in the axial direction and the engagement holes of the connection plate are fitted and connected to the engagement protrusions, many parts are attached to the segment, which makes the manufacture of the segment cumbersome and increases costs. It is also troublesome in terms of construction such as positioning.

The present invention has been made to solve the above problems, and has a simple structure and a small number of constituent members. Therefore, the manufacturing is easy, the manufacturing time is shortened, and the cost can be reduced. The objective is to provide an excellent synthetic segment.
In addition, the present invention provides a connecting structure that can easily and reliably connect the segments in the axial direction and the circumferential direction with a simple structure in the above-described synthetic segment, and can further greatly reduce the cost. It is for the purpose.

(1) A composite segment according to the present invention is a composite segment in which a plurality of tunnel segments are connected in the circumferential direction and the axial direction of a tunnel to construct a tunnel wall, and a pair of axial directions provided at predetermined intervals in the axial direction of the tunnel A wall, a skin plate joined to the outer peripheral side or the outer peripheral side and the inner peripheral side of the axial wall, a circumferential wall joined to both ends of the axial wall and the skin plate, and a region surrounded by these to consist with Da設be concrete, the pair of axial walls to form a steel tube provided on the inner periphery side or the outer periphery side, by a main girder joined to the outer circumferential side or an inner circumferential side of the steel pipe And the said circumferential wall is comprised with the joint board by which the short pipe was provided in the inner surface side corresponding to the steel pipe of the said axial wall .

(2) The pair of axial walls in (1) above were formed by steel pipes provided on the inner peripheral side and the outer peripheral side, and a main girder plate joined between these steel pipes.
(3) The short pipe of the above (1) or (2) was formed of a steel pipe having substantially the same outer dimensions as the steel pipe of the axial wall and the length substantially the same as the interval between the steel pipes.
(4) Moreover, the some reinforcement means was provided between a pair of axial walls in any one of said (1)- (3) .
(5) Sliding over the concrete placement surface of the skin plate according to any one of (1) to (4 ) above or all or part of the concrete placement surface of the axial wall, skin plate, circumferential wall and reinforcing means. A stop was provided.

(6) Concrete was filled into the steel pipe of any one of (1) to (5 ) above.
(7) Restraint plates were joined to both ends of the steel pipe filled with the concrete of (6 ) above.
(8) A high fluidity concrete having a maximum aggregate size of 20 mm, a slump flow of 60 cm ± 10 cm, and an air amount of 2% ± 1% was used as the concrete of any one of the above (1) to (7) .

(9) The axial connection means is provided on the main girder of the pair of axial walls in any one of (1) to (8 ) above.
(10) A plurality of first axial joint members provided at predetermined intervals in the circumferential direction of the main beam plate of one axial wall and the other axial wall of the axial connection means of (9 ) above The main girder plate is constituted by a second axial joint member provided corresponding to the first axial joint member.

(11) The first axial joint member according to (10) is formed of a steel pipe or a round steel bar in which approximately one half of the longitudinal direction protrudes from one main girder plate and is joined to the main girder plate. Then, the second axial joint member is formed of a steel pipe whose end is opened to the other main girder plate and joined to the main girder plate, and the first axial joint member is fitted therein.
(12) A retaining means is provided on the first axial joint member and the second axial joint member of (10) or (11) .

(13) The circumferential direction connection means was provided in the both ends of the synthetic | combination segment in any one of said (1)- (12) .
(14) The circumferential direction coupling means of (13 ) above is formed by using a main body portion having a guide groove formed between side walls having a rectangular cross section provided in the longitudinal direction on both sides of the rectangular width direction, and one of the main body portions. The guide groove is covered with an engagement steel plate on the end side of the main body, and the engagement portion formed by the engagement steel plate and the guide groove is attached to the guide groove in the vicinity of the other end of the main body, It was formed by a circumferential joint member composed of an engaging protrusion protruding from the upper surface of the side wall at a height substantially equal to the depth of the guide groove.

(15) The circumferential joint member of (14) is provided with a retaining means.
(16) The circumferential joint member of the above (14) or (15) was attached to both ends of the composite segment in place of the circumferential wall or the circumferential wall so that the engaging protrusions were at opposite positions.
(17) The synthetic segments (1) to (16) were formed in a substantially arc shape along the circumferential direction of the tunnel.

According to the synthetic segment according to the present invention, the axial wall is constituted by the steel pipe and the main girder, so that the number of constituent members is small and the manufacturing is easy and the cost can be reduced.
Further, since the axial connecting means is constituted by the first axial joint member and the second axial joint member with which the first axial joint member is fitted, the composite segments can be connected in the axial direction with one touch, and the connecting work is extremely easy. The workability can be improved.
Furthermore, since the circumferential direction coupling means is attached to both ends of the synthetic segment with the circumferential joint member having the same structure and the guide groove is used as a guide, the synthetic segment can be easily coupled in the circumferential direction. Can be improved.

[Embodiment 1]
FIG. 1 is a perspective view showing a part of a synthetic segment according to Embodiment 1 of the present invention in cross section, and FIG. 2 is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 3, a composite segment according to the present invention (hereinafter simply referred to as a segment) forms a tunnel circumferential wall by connecting a plurality of segments S in a ring shape in a tunnel excavated in the ground. The tunnel wall is constructed by sequentially connecting the circumferential walls of the tunnel in the axial direction of the tunnel.

1 and 2, reference numerals 1a and 1b denote axial walls of the tunnel of the segment S, and 2a and 2b denote cross-sectional polygons provided on the inner peripheral side of the tunnel constituting the axial walls 1a and 1b (in the drawings, It is a hollow steel material (hereinafter referred to as a steel pipe).
These steel pipes 2a and 2b (hereinafter sometimes simply referred to as 2) are formed of rectangular steel pipes having a relatively small cross-sectional area (for example, a width of 100 mm on one side), and have a radius r (FIG. 3) along the circumferential direction of the tunnel. (Refer to Fig. 1), and the inside is filled with concrete.

  In this case, commercially available steel pipes 2a and 2b can be generally used, but there are cases where the steel pipes 2a and 2b cannot be applied to the axial walls 1a and 1b due to limitations in size and thickness. In such a case, the edge portions of the four steel plates are welded or joined, or steel materials that are bent into L-shapes or U-shapes are welded, and further commercially available steel materials such as angles and channels are used. It may be welded or the like, and when the polygonal steel pipes 2a and 2b are configured, the edge portions of a plurality of steel plates may be welded (the same applies to other embodiments). ).

  3a and 3b are main girder plates formed along the arcuate shapes of the steel pipes 2a and 2b, and are welded to the outer peripheral side (the lower side in the figure) along the axial outer walls of the steel pipes 2a and 2b. These steel pipes 2a and 2b and the main beam plates 3a and 3b form axial walls 1a and 1b. The main beam plates 3a and 3b may be joined to the outer walls in the axial direction of the steel pipes 2a and 2b as shown in FIG.

  As shown in FIG. 2, the axial walls 1a and 1b are arranged at a predetermined distance D in the axial direction of the tunnel, and circularly extend along the main girder plates 3a and 3b at the lower ends of the main girder plates 3a and 3b. The outer peripheral side skin plate 5 which is formed in an arc shape and forms the outer peripheral wall of the tunnel is welded and integrated. Note that a plurality of rows of anti-skids 6 such as studs are provided at predetermined intervals in the circumferential direction on the inner wall surface of the outer peripheral side skin plate 5, and hence on the placement surface of the concrete 40 described later. Reference numeral 7 denotes a diaphragm which is a reinforcing means which is provided at a predetermined interval in the circumferential direction between the axial walls 1a and 1b and maintains the axial interval. The reinforcing means may be a round bar or a thin steel pipe instead of the diaphragm 7.

  Moreover, the restraint board 4 which restrains the concrete 40 with which the inside was filled is joined to the both ends of the steel pipes 2a and 2b, and the concrete filled with the steel pipes 2a and 2b is constrained by restraining both ends. 40 is integrated, and the bending strength and bending rigidity of the steel pipes 2a and 2b can be improved. A joint plate 8 forms a circumferential wall that closes the openings at both ends. In this case, the restraint plate 4 may be omitted, and the opening including the steel pipes 2 a and 2 b may be closed with the joint plate 8. The closing means for the opening portions at both ends of the segment S is not limited to this. For example, other means such as a joint member in the circumferential direction may be used.

  The axial walls 1a, 1b, the outer peripheral side skin plate 5 and the joint plate 8 form a box-shaped part 9 having an inner peripheral side opened. Concrete 40 is placed in the box-shaped part 9 so that the segment S is formed. Composed. Although not shown, a reinforcing bar or the like may be arranged in the box-shaped portion 9 in order to prevent cracking of the concrete 40 or the like.

In the above description, the case where the concrete 40 is filled in the steel pipes 2a and 2b is shown, but this may be omitted.
Moreover, although the case where the anti-slip 6 was provided on the inner wall surface of the outer peripheral side skin plate 5 was shown, the steel pipes 2a and 2b, the main girder plates 3a and 3b, the diaphragm 7 and the joint plate 8 surrounding the box-shaped portion 9 are further shown. Anti-skid 6 may be provided on all or part of the wall surface, whereby the box-shaped portion 9 and the concrete 40 can be more firmly integrated. In the present embodiment, the case where the steel pipes 2a and 2b are provided on the inner peripheral side of the axial walls 1a and 1b is shown, but the steel pipes 2a and 2b may be provided on the outer peripheral side (second embodiment). The same applies to the above).

  By the way, the concrete 40 to be filled in the steel pipes 2a and 2b and the box-shaped portion 9 needs to be surely filled to every corner in order to ensure the bending strength and bending rigidity of the segment S. Therefore, in the present embodiment, high-fluidity concrete (hereinafter sometimes simply referred to as concrete) having a maximum aggregate size: 20 mm, slump flow: 60 cm ± 10 cm, and air amount: 2% ± 1% was used. Thereby, it was possible to reliably fill the concrete 40 to every corner of the steel pipes 2a and 2b and the box-shaped portion 9 (the same applies to other embodiments).

According to the present embodiment, the axial walls 1a and 1b of the tunnel of the segment S are constituted by the steel pipes 2a and 2b and the main girders 3a and 3b, so that the steel pipes 2a and 2b are not buckled. Since it can be bent and formed into an arc shape along the circumferential direction of the tunnel, manufacturing is easy. Further, it is not necessary to provide a stiffener on the outer skin plate 5 constituting the circumferential wall of the tunnel, and it is possible to ensure rigidity that can withstand the load when the concrete 40 is placed.
Further, by joining the restraint plates 4 to both ends of the steel pipes 2a and 2b, it is not necessary to prevent the shearing force in the circumferential direction between the steel pipes 2a and 2b and the concrete 40 filled therein.

Further, the axial walls 1a and 1b of the tunnel are composed of steel pipes 2a and 2b filled with concrete 40 and main girder plates 3a and 3b, so that the bearing strength of the side surface of the segment S is improved and the jack of the construction Can withstand large indentation forces. Moreover, since the flanges (upper and lower surfaces) of the steel pipes 2a and 2b resist the bending force generated in the segment S after construction, the amount of vertical reinforcing bars and the like can be reduced.
As a result, the manufacturing cost of the segment S is reduced, and not only the manufacturing time is shortened, but also the workability can be improved.

[Embodiment 2]
4 is a perspective view in which a part of a segment according to Embodiment 2 of the present invention is omitted, and FIG. 5 is a cross-sectional view taken along line BB in FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, a slip stopper 6 is provided on the inner surface side of the wall surface (flange) on the inner peripheral surface side of the steel pipes 2a and 2b constituting the axial walls 1a and 1b of the segment S according to the first embodiment. The inner side skin plate 10 bent into an arc shape along the steel pipes 2a and 2b is joined by welding. Thereby, since the space | interval of both axial direction walls 1a and 1b is ensured, the diaphragm 7 in Embodiment 1 can be abbreviate | omitted. Although FIG. 4 shows the case where the skin plates 5 and 10 are provided on both the outer peripheral side and the inner peripheral side of the segment S, the skin plate 10 may be provided only on the inner peripheral side (the following embodiments will be described). The same applies to the form).

The closing means for the openings at both ends in the circumferential direction including the steel pipes 2a and 2b and the manufacturing procedure in the present embodiment are substantially the same as those in the first embodiment. Since the periphery of the box-shaped part 9 to be filled is closed, when filling the concrete 40 into the box-shaped part 9, first, one opening in the circumferential direction of the segment S is closed with the joint plate 8, and the other The concrete 40 is filled from the opening, and after the concrete 40 is solidified, the opening may be closed with the joint plate 8.
The effect of the present embodiment is almost the same as that of the first embodiment, but the inner peripheral side skin plate 10 is also provided on the inner peripheral surface side of the segment S, so that the rigidity can be further improved.

[Embodiment 3]
6 is a perspective view in which a part of a segment according to Embodiment 3 of the present invention is omitted, and FIG. 7 is a cross-sectional view taken along the line CC in FIG. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, 2, and description is abbreviate | omitted.
In this embodiment, in the segment S according to the second embodiment, the steel pipes 2c and 2d are also provided on the outer peripheral side of the axial walls 1a and 1b, and the inner and outer steel pipes 2a and 2c, 2b and 2d are provided. The space is joined by the main beam plates 3a and 3b, respectively.

That is, the steel pipes 2a to 2d are provided at the inner and outer peripheral sides of the axial walls 1a and 1b, and thus at the four corners of the segment S, and the outer peripheral skin plate 5 is welded between the outer wall surfaces of the outer steel pipes 2c and 2d. The inner skin plate 10 is welded and joined between the inner wall surfaces of the steel pipes 2a and 2b on the inner circumference side.
The means for closing the opening at the circumferential end including the steel pipes 2a to 2d and the manufacturing procedure in the present embodiment are substantially the same as those in the first and second embodiments. The inner skin plate 10 may be omitted, but in this case, a member that does not hinder the filling of the concrete 40 between the inner steel pipes 2a and 2b as necessary (for example, Round bars) may be provided at appropriate intervals.

  The effect of the present embodiment is almost the same as in the first and second embodiments, but further, steel pipes 2a, 2b, 2c and 2d are provided on the inner and outer peripheral sides of the axial walls 1a and 1b of the segment 1, respectively. Therefore, the rigidity of the segment S can be further increased.

[Embodiment 4]
FIG. 8 is an explanatory diagram of a main part of a segment according to Embodiment 4 of the present invention.
In the present embodiment, a steel pipe is provided on the inner surface side (box portion 9 side) of the joint plate 8 which is a circumferential wall joined to both ends of the segment S.

That is, as shown in FIG. 8A, in the case of the segment S of the first and second embodiments, both steel pipes 2a and 2b have substantially the same outer dimensions as the steel pipes 2a and 2b constituting the axial walls 1a and 1b. A steel pipe 8a (hereinafter referred to as a short pipe) having a length substantially equal to the interval D of the joint plate 8 is welded and joined to the inner peripheral side (position corresponding to the steel pipes 2a and 2b) on the inner surface side of the joint plate 8.
Further, in the case of the segment S of the third embodiment, short pipes 8a and 8b are welded and joined to the inner peripheral side and the outer peripheral side on the inner surface side of the joint plate 8 in the same manner.

As shown in FIG. 9, the joint plate 8 of FIG. 8A configured as described above has a short pipe 8 a inserted between the steel pipes 2 a and 2 b of the axial walls 1 a and 1 b, and the joint plate 8 is attached to the joint plate 8. It weld-joins to the axial direction walls 1a and 1b and the both ends of the outer surface side skin plate 5, respectively. The same applies to the joint plate 8 in FIG.
According to the present embodiment, the rigidity of the joint plate 8 can be improved, and the distance between the steel pipes 2a, 2b is maintained by the short pipe 8a or 8a, 8b inserted between the steel pipes 2a, 2b. be able to.

In the above description, the case where the short pipes 8a and 8b are made of steel pipes having substantially the same outer dimensions as the steel pipes 2a and 2b of the axial walls 1a and 1b has been shown, but the steel pipes 2a and 2b are different from the outer dimensions. May be.
Moreover, although the case where short pipe 8a, 8b was formed in the length substantially equal to the space | interval D of both steel pipes 2a, 2b was shown, it formed in the length same as the width | variety of the joint board 8, and axial direction wall 1a, 1b and You may make it join to the both ends of the outer peripheral side skin plate 5. FIG.

[Embodiment 5]
FIG. 10 is a perspective view of a composite segment provided with a connection structure in the tunnel axis direction shown with a part omitted according to Embodiment 5 of the present invention, and FIG. 11 is a DD cross-sectional view thereof. In the following description, the segment according to the third embodiment is provided with a connecting structure in the axial direction of the tunnel, but the present invention can also be applied to the segment S of the first, second, and fourth embodiments. The same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In both figures, one of the axial walls of the segment S (e.g., 1a) in the circumferential direction of the main girder 3a (longitudinal direction) of the plurality of first mounting holes 11 of the inner diameter d ₁ at predetermined intervals provided is is, the main girder 3b in the other axial wall 1b, the first and faces the mounting hole 11, an inner diameter d ₂ is the first inner diameter greater than the second attachment of the mounting hole d ₁ A hole 12 is provided. The number of the first and second mounting holes 11 and 12 is not particularly limited, but is desirably an even number of 4 or more.

  Reference numeral 13 denotes a first axial joint member that constitutes an axial coupling means that is inserted into the first mounting hole 11 provided in the main girder plate 3a to the vicinity of the center in the longitudinal direction and welded to the main girder plate 3a. , 14 is inserted into the second mounting hole 12 provided in the main girder plate 3b until its end is substantially flush with the outer surface of the main girder plate 3b, and is axially welded to the main girder plate 3b. It is the 2nd axial direction joint member which comprises a connection means.

An example of the first and second axial joint members 13 and 14 is shown in FIG. The first axial joint member 13 is made of a steel pipe (steel pipe) whose outer diameter d ₃ is substantially equal to the inner diameter d _{1 of} the first mounting hole 11 provided in the main girder plate 3a, and the outer periphery of its tip is chamfered. ing. The second axial joint member 14 is shorter than the first axial joint member 13 (for example, about one half), and the second outer diameter d ₄ is provided on the main girder plate 3b. The mounting hole 12 is made of a steel pipe (steel pipe) that is substantially equal to the inner diameter d ₂ and whose inner diameter d ₅ is substantially equal to the outer diameter d _{3 of} the first axial joint member 13. The first axial joint member 13 may be formed of a round steel bar.

  In manufacturing the segment S having the first and second axial joint members 13 and 14 as described above, the steel pipes 2a, 2c, 2b, and 2d and the first and The axial walls 1a and 1b comprising the main girder plates 3a and 3b provided with two mounting holes 11 and 12 are arranged at a predetermined distance D, and the outer skin plate 5 is disposed on the outer circumferential side and the inner skin is disposed on the inner circumferential side. The circumferential skin plate 10 is welded and joined, and the opening at one circumferential end is closed by the joint plate 8.

  Then, before filling the box-shaped portion 9 with the concrete 40, the first axial joint member 13 is inserted into the first mounting hole 11 provided in the main girder plate 3a to the vicinity of the central portion in the longitudinal direction, The main girder plate 3a is welded. Further, the second axial joint members 14 are respectively inserted into the second mounting holes 12 provided in the main girder plate 3b until the end portions thereof are substantially flush with the outer surface of the main girder plate 3b. Welded to 3b.

  Next, concrete 40 is filled into the box-shaped portion 9 from the opening at the other end in the circumferential direction. After the concrete 40 is solidified, the opening is closed by the joint plate 8. Accordingly, as shown in FIG. 11B, the portion inserted into the box-shaped portion 9 of the first axial joint member 13 and the second axial joint member 14 are connected to the main girder plates 3a and 3b. Combined with the welded joint, the concrete 40 is firmly fixed.

Next, an example of an axial connection procedure of the segments S provided with the axial joint members 13 and 14 as described above will be described with reference to FIG.
In FIG. 13 (a), S ₁ is the existing segments installed in the tunnel, S ₂ is a connecting segment that connects to the tunnel axis direction of the existing segment S _1, the existing segment S ₁ and the second axial coupling member axial wall 1b which 14 is provided is located on the front side carries the connection segment S ₂ an axial wall 1a of the first axial coupling member 13 is provided to face the existing segments S ₁ . Then, the connecting segment S ₂ is moved in the direction of the arrow to align the first axial joint member 13 and the second axial joint member 14, and the connecting segment S ₂ is pressed in the direction of the arrow to form the first axial direction. If the joint member 13 is fitted into the second axial joint member 14, as shown in FIG. 13B, the two are integrally connected.

  FIG. 14 is an explanatory view showing another example of the first axial joint member 13 and the second axial joint member 14. From the substantially central part in the longitudinal direction of the first axial joint member 13 to the tip end side (the part protruding from the main beam plate 3a or 3b of the axial wall 1a or 1b), slits are provided at substantially equal intervals on the circumference. 15 is provided, and elastic pieces 16 to which elasticity is imparted are respectively formed. On the outer periphery of the distal end portion of the elastic piece 16, a locking projection 17 having an inclined surface on the distal end portion side is provided. Further, the inner peripheral surface on the tip end side of the second axial joint member 14 is enlarged in diameter (expanded portion 18), and a locking step portion 19 is provided corresponding to the locking projection 17. These constitute the retaining means.

When the first axial joint member 13 is inserted into the second axial joint member 14 in order to connect the connection segment S ₂ to the existing segment S ₁ , the locking projection 17 is moved to the second axial joint member 14. However, since the elastic piece 16 is bent and reduced in diameter, it can be easily inserted. When further inserted and the locking projection 17 reaches the diameter-expanded portion 18 of the second axial joint member 14, each elastic piece 16 returns to its original state and is expanded in diameter, as shown in FIG. The stop projection 17 is locked to the locking step 19.
Thus, the first axial coupling member 13 does not get out of the second axial coupling member 14, connecting segment S ₂ are firmly connected to the existing segment S _1. The locking protrusion 17 may be formed by a protrusion provided on each elastic piece 16.

According to the present embodiment, in order to connect the segment S in the axial direction of the tunnel, the first axial joint member 13 is provided on the main girder plate 3a of one axial wall (for example, 1a), and the other since the main girder 3b axial wall 1b is provided a second axial coupling member 14, the first axial coupling member 13 of the connecting segment S _2, the second axial coupling member of the existing segments S ₁ the connecting segment S ₂ by inserting 14 can be connected by one touch to the existing segment S _1. In this case, between the first axial coupling member 13 and the second axial coupling member 14, for example, FIG. 14, by providing the retaining means as described in FIG. 15, the connecting segment S ₂ The existing segment S ₁ can be firmly connected. FIG. 14 and FIG. 15 show an example of the slip-out preventing means, and the present invention is not limited to this, and other means may be used.

According to this embodiment, the axial wall 1a axial coupling means, the main girder 3a constituting the 1b, since there is provided the 3b, the easy to manufacture existing segment S ₁ to the tunnel axis, connecting segment S ₂ can be connected with one touch. For this reason, not only the manufacture of the segments is easy, but also the connection workability in the tunnel axis direction can be greatly improved.

[Embodiment 6]
FIG. 16 is a perspective view of a segment provided with a circumferential connecting means for a tunnel according to Embodiment 6 of the present invention. In the following description, a case where tunnel circumferential direction connecting means is provided in the segment S of the third embodiment is shown, and the same parts as those of the third embodiment are denoted by the same reference numerals and description thereof is omitted. To do.

16, 20 is a circumferential joint member provided at both ends in the circumferential direction of the segment S, and an example thereof is shown in FIG.
The main body portion 21 constituting the circumferential joint member 20 is formed by bending both sides in the width direction of a rectangular steel plate inward to form side walls 22a and 22b having a quadrangular cross section in the longitudinal direction. The guide groove 23 is formed in the longitudinal direction between 22b. The main body 21 may be formed by, for example, joining a rectangular steel pipe, a channel-shaped steel material, or a steel bar having a rectangular cross section in the longitudinal direction on both sides of the strip-shaped width direction, and providing a guide groove 23 therebetween. Alternatively, the guide grooves 23 may be formed by arranging square steel pipes or the like at predetermined intervals and joining a joint plate or the like therebetween.

  The length L of the main body 21 is selected to be approximately equal to or slightly shorter than the width of the segment S, and the width W is selected to be approximately equal to or slightly narrower than the thickness of the segment S. The width of one side of the side walls 22a and 22b is desirably formed substantially equal to the width of one side of the steel pipes 2a and 2b provided on the axial walls 1a and 1b of the segment S.

  Reference numeral 25 denotes an engagement steel plate which is welded to both side walls 22a and 22b at one end of the main body 21 and covers the guide groove 23, and the upper surface thereof is the same as the upper surfaces (hereinafter referred to as flanges) of the side walls 22a and 22b. An engagement portion 24 of an engagement protrusion 26 described later is formed by the guide groove 23 and the engagement steel plate 25. The engaging portion 24 may be formed by bending a steel plate into a U-shape and inserting it into the guide groove 23 and welding both side plates to the inner wall surfaces of the side walls 22a and 22b.

Reference numeral 26 denotes an engaging projection attached to the guide groove 23 on the other end side of the main body 21. As shown in FIG. 18, the steel plate is bent, and the top plate 27 and the side plates 28a and 28b are substantially connected. The width W ₂ of the top plate 27 is approximately equal to the width W ₁ of the guide groove 23, and the height h of the side plates 28 a and 28 b is approximately twice the depth t of the guide groove 23. Then, from one end (hereinafter referred to as the front end) of the side plates 28a, 28b to the vicinity of the substantially central portion in the longitudinal direction, from the position slightly higher than about one half of the side plates 28a, 28b from the lower end to the rear, An engaging portion 29 that is inclined to the stepped portion 30 is provided, and the side plate 28a, 28b above the top portion 27 and the upper portion of the engaging portion 29 are bent obliquely inwardly, and the distal end portion is slightly narrower. The part 31 is formed.

The engaging protrusion 26 is located at a position slightly closer to the engaging portion 24 side from the other end (opposite side of the engaging portion 24) of the main body portion 21 (a position on the inner side of the length of the engaging steel plate 25). The both side plates 28a, 28b are welded and joined to the side walls 22a, 22b and are integrally attached. At this time, the protruding length h ₁ from the flange surfaces of the side walls 22 a and 22 b of the engaging protrusion 26 is substantially equal to the depth t of the guide groove 23.
As described above, the circumferential joint member 20 in which the engagement portion 24 is provided in the main body portion 21 and the engagement protrusion 26 is attached has a symmetrical structure in the width direction.

  As shown in FIG. 16, the circumferential joint member 20 configured as described above has one opening in the circumferential direction of the segment S or the joint plate 8 described in the fourth embodiment before placing the concrete 40. For example, with the engaging projections 26 facing forward and the flange surfaces of the side walls 22a, 22b being substantially flush with the ends of the openings, the axial walls 1a, 1b and The outer skin plate 5 and the inner skin plate 10 are welded and attached. When there is a portion that interferes with the axial walls 1a and 1b (particularly the steel pipes 2a and 2b) when inserting into the opening, the portion or a part of the steel pipes 2a and 2b is cut off.

  Next, concrete 40 is filled in the box-shaped portion 9 of the segment S. After the concrete 40 is solidified, the circumferential joint member 20 having the same structure as that of the circumferential joint member 20 is inserted into the opening at the other end in the circumferential direction of the segment S, and the engagement protrusion 26 is disposed on the back side. That is, it is attached in the same manner as described above so that the engaging protrusions 26 of the circumferential joint member 20 attached to both ends in the circumferential direction of the segment S are in opposite positions.

Next, an example of the connection procedure in the tunnel circumferential direction of the segment S in which the circumferential joint member 20 is attached to both ends as described above will be described with reference to FIGS. 19 and 20. S ₁ is an existing segment already installed in the circumferential direction of the tunnel, and S ₂ is a connecting segment connected to the existing segment S ₁ .

First, as shown in FIG. 19, connecting the locking projection 26 of segment S ₂ may be carried so as to be positioned between the engagement portion 24a and the locking projection 26a of the existing segment S _1. Then, as shown in FIG. 20 (a), the connecting segment S ₂ is moved in the direction of the arrow a, both the engaging projections 26a, fitted respectively 26b counterpart of the guide groove 23b, the 23a. At this time, the flange surfaces of the side walls 22a and 22b of the circumferential joint members 20a and 20b of both the segments S ₁ and S ₂ come into contact with each other, and the top plate 27 of the engaging projections 26a and 26b is connected to the other guide groove 23b, It almost contacts the bottom of 23a.

Then, the connecting segment S ₂ is pressed in the direction of arrow b (the axial direction of the tunnel), and as shown in FIG. 20B, the engaging projection 26a of the existing segment S ₁ is engaged with the engaging portion 24a of the connecting segment S _2. to the engaging projection 26b of the coupling segment S ₂ fitted respectively in the engaging portion 24a of the existing segments S _1, the axial wall 1b of the connecting segment S ₂ is on the axial wall 1b flush the existing segments S ₁ Push until it is in the position. At this time, the engaging portions 29a and 29b of the engaging protrusions 26a and 26b of both segments S ₁ and S ₂ are engaged with the mating engaging steel plates 25b and 25a.

Thus, connection of the connecting segments S ₂ to the existing segment S ₁ is completed. In the same manner, the connecting segments S ₃ , S ₄ , S ₅ ,... Are sequentially connected to the existing segment S ₁ to construct a tunnel circumferential wall. Note that the when the push connection segment S _2, can be utilized propulsion jacks that are mounted on the shield machine used in tunnel excavation.

Segment S to the circumferential direction joint member 20 is attached at both ends as described above is fitted into the engaging portion 24b engaging projection 26a of the existing segment S ₁ is along the guide groove 23b of the coupling segment S ₂ Then, the top plate 27 comes into contact with the bottom surface of the guide groove 23b, and the engaging portion 29a is engaged with the engaging steel plate 25b of the engaging portion 24b. Similarly, coupling the engaging projection 26b of the segment S ₂ is fitted to the engagement portion 24a of the existing segments S _1, since the locking portion 29b is engaged with the engagement steel plate 25a, the engaging projections 26a, 26b of the top plate 27 and the guide groove 23b, in contact with the bottom of the 23a, Further, both the locking portions 29a, engaging the steel plate 25b to 29b and which are engaged by the wedge action of the 25a, connecting segment S ₂ is the existing segments S ₁ is firmly connected.

FIG. 21 is an explanatory diagram showing another example of the present embodiment. In this example, as shown in FIG. 21A, the engagement protrusion of the circumferential joint member 20a provided in _one segment S ₁ (in the following description, the existing segment S ₁ and the connecting segment S ₂ will be described). the top plate 27 of the parts 26a, the distal end portion provided with a side triangular locking projection 32 having an inclined surface which becomes higher toward the rear end, of the connecting segment S ₂ in the circumferential direction fitting member 20b of the guide groove 23b It becomes higher from the engagement protrusion 26b side toward the engagement part 24b at a position where the engagement protrusion 32 provided on the engagement protrusion 26a is engaged when both the segments S ₁ and S ₂ are connected at the bottom. A locking projection 33 having a sloped side surface is provided to form a retaining means. Although not shown, the bottom of the guide groove 23a of the top plate 27 of the engaging projection 26b of the provided connection segment S ₂ circumferential joint member 20b, and is provided on the existing segments S ₁ circumferential joint member 20a Similarly, locking projections 32 and 33 are provided.

Thus circumferential joint member 20a, is provided with the anchoring means to 20b, when connecting the connecting segment S ₂ to the existing segments S _1, as shown in FIG. 21 (b), both the circumferential joint member 20a, 20b of the engaging projection 26a, the engaging projection 32 provided on the top plate 27 of 26b is the other party of the guide grooves 23b, so engaged with the locking projection 33 provided on the bottom of the 23a, connecting segment S ₂ tunnel It is possible to reliably prevent the slipping out in the axial direction.

  Although the case where the circumferential joint member 20 according to the present embodiment is provided in the segment S according to the third embodiment has been described in the above description, the present invention is also applied to the segment S according to the first, second, or fourth embodiment. The circumferential joint member 20 according to the embodiment can be provided. In addition, when implementing in Embodiment 1, and when not providing the inner skin plate 10 in Embodiment 3, it is a predetermined interval in the longitudinal direction in the width direction on the back side of the main body portion 21 of the circumferential joint member 20. A plurality of reinforcing plates may be provided. Thereby, while reinforcing the guide groove 23 of the main-body part 21, the adhesive force of the concrete 40 with which the box-shaped part 9 was filled can be improved.

  According to the present embodiment, since the circumferential joint member 20 has a left-right symmetrical structure in the width direction, the circumferential joint member 20 having the same structure is engaged with the engaging protrusions 26 at both circumferential ends of the segment S. Therefore, it is sufficient to prepare one kind of circumferential joint member 20, so that it is very easy to manufacture the circumferential joint member 20, manage inventory, and attach it to the segment S. Yes, cost can be reduced.

Further, when the segments S are connected in the tunnel circumferential direction, the circumferential joint of the connecting segment S ₂ is disposed at an appropriate position between the engaging portion 24a and the engaging protrusion 26a of the circumferential joint member 20a of the existing segment S _1. the engaging protrusion 26b of the member 20b is positioned, the engaging projections 26a, 26b of the guide groove 23b, since it is pushed to fit into 23a, significantly greater freedom of positioning of the connecting segments S ₂ Therefore, the construction is very easy.

Further, in the existing segment S ₁ and the connecting segment S ₂ , the engaging protrusions 26a, 26b of the circumferential joint members 20a, 20b are fitted into the other guide grooves 23b, 23a, and the engaging portions 29a, 29b thereof. Since the engagement steel plates 25b and 25a of the mating engagement portions 24b and 24a are locked in a wedge shape, the engagement protrusions 26a and 26b and the engagement steel plates 25a and 25b are not only prevented from being deformed, but also connected segments. S ₁ does not come out in the pushing direction or in a direction perpendicular to the pushing direction.

[Embodiment 7]
FIG. 22 is a side view of a segment according to Embodiment 7 of the present invention.
In the first to sixth embodiments, the steel pipes 2a and 2b (or 2a to 2d) and the main beam plates 3a and 3b are formed in an arc shape to form the axial walls 1a and 1b. form divides straight steel tube 2a, and 2b (or 2 a to 2 d) main girder plates 3a, 3b to each of a plurality _{S 11, S 12, S 13} ( FIG. 20 there is shown three cases) These are welded to form the axial walls 1a and 1b having a shape approximating an arc shape.
Also in the present embodiment, it is possible to configure the segment S substantially the same as in the first to sixth embodiments, and it is possible to obtain substantially the same effect.

  In the first to seventh embodiments described above, the segment S constituting the peripheral wall of the tunnel having a circular cross section has been described, but the segment S according to each of these embodiments is the segment S constituting the inner wall of the tunnel having an elliptical cross section. Can also be implemented. In this case, the arc-shaped bending radius r may be changed according to the installation location of the segment S in the circumferential direction of the tunnel.

[Embodiment 8]
FIG. 23 is an explanatory diagram in which the tunnel circumferential wall is constructed by the segments according to the eighth embodiment of the present invention, and FIG. 24 is an explanatory diagram of the horizontal segment of FIG. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1-7, and description is abbreviate | omitted.
In the first to seventh embodiments, the case where a plurality of arc-shaped segments S are joined in a ring shape to the inner peripheral surface of a tunnel having a circular cross section excavated in the ground has been described. The embodiment relates to a segment that constructs a peripheral wall of a tunnel having a rectangular (quadrangle) cross section.

Although the segment S of the first to seventh embodiments has been shown to be formed in a substantially arc shape with a radius r along the circumferential direction of the tunnel having a circular cross section, in this embodiment, the segment S is bent in an arc shape. It is formed into a lithographic shape without processing. Then, both ends of the upper horizontal segments S ₃ and S ₃ and the lower horizontal segments S ₄ and S ₄ are connected by the left and right vertical segments S ₅ to construct a rectangular circumferential wall. In the figure, the upper and lower horizontal segments S ₃ and S ₄ are each two, and the left and right vertical segments S ₅ are each one. However, an appropriate number of horizontal segments S ₃ is selected according to the size of the tunnel. , S ₄ and vertical segment S ₅ are connected.

In this case, the horizontal segments S ₃ and S ₄ (segments connected to the vertical segment S ₅ ) located at both ends are connected to the adjacent horizontal segment S ₃ (or S ₄ ) as shown in FIG. 24, for example. For example, the circumferential joint member 20 described in the sixth embodiment is attached to the end portion on the side, and the end portion on the side connected to the vertical segment S ₅ is closed with, for example, the joint plate 8, and its lower surface (or upper surface). to, it may be provided circumferentially joint member 20 which connects the vertical segments S _5. In addition, what is necessary is just to provide the 1st connection member 13 demonstrated in Embodiment 5, and the 2nd connection member 14 in the axial direction connection member connected in a tunnel axial direction, for example.
Also in the present embodiment, substantially the same effect as in the first to seventh embodiments can be obtained.

  In the above description, the first axial joint member 13 made of a steel pipe or a round bar joined to one main girder plate 3a and the other main girder plate are connected to the axial direction connecting means of the segment S according to the present invention. And a second axial joint member 14 made of a steel pipe joined to 3b, and an engagement protrusion 26 fixed to the guide groove 23 as a circumferential connecting means, and the engagement protrusion 26 is locked. Although the case where it comprised with the circumferential direction coupling member 20 provided with the engaging part 24 to perform was shown, this invention is not limited to this, For example, both or both of an axial direction and a circumferential direction are connected with a volt | bolt. For example, other means may be used.

It is the perspective view which showed a part of synthetic | combination segment which concerns on Embodiment 1 of this invention in the cross section. It is AA sectional drawing of FIG. It is explanatory drawing which shows the state which connected the synthetic | combination segment of FIG. 1 in the circumferential direction of the tunnel. It is the perspective view which abbreviate | omitted some synthetic | combination segments which concern on Embodiment 2 of this invention. It is BB sectional drawing of FIG. It is the perspective view which abbreviate | omitted some synthetic | combination segments which concern on Embodiment 3 of this invention. It is CC sectional drawing of FIG. It is explanatory drawing of the principal part of the synthetic | combination segment which concerns on Embodiment 4 of this invention. It is explanatory drawing which shows the state which joined the joint board of FIG. 8 to the axial direction wall and the outer peripheral side skin plate. It is a perspective view of the synthetic | combination segment provided with the connection structure of the tunnel axis direction which abbreviate | omitted and showed the part which concerns on Embodiment 5 of this invention. It is DD sectional drawing of FIG. It is explanatory drawing which shows an example of the 1st, 2nd axial direction coupling member of FIG. It is explanatory drawing which shows the connection procedure of the tunnel axis direction of the synthetic | combination segment of FIG. It is explanatory drawing which shows the other example of the 1st, 2nd axial direction coupling member of FIG. It is action | operation explanatory drawing of the 1st, 2nd axial direction coupling member of FIG. It is a perspective view of the synthetic | combination segment provided with the connection structure of the tunnel circumferential direction which concerns on Embodiment 6 of this invention. FIG. 17 is a perspective view of the circumferential joint member of FIG. 16. It is a perspective view of the engaging protrusion of FIG. It is explanatory drawing which shows the connection procedure of the circumferential direction of a synthetic | combination segment. It is explanatory drawing which shows the connection procedure of the circumferential direction of a synthetic | combination segment. It is operation | movement explanatory drawing of the circumferential direction coupling member provided with the prevention means from detachment | leave. It is a side view of the synthetic segment which concerns on Embodiment 7 of this invention. It is explanatory drawing which shows the state which connected the synthetic segment which concerns on Embodiment 8 of this invention to the circumferential direction of the tunnel of a cross-sectional rectangle. It is explanatory drawing of the horizontal segment of FIG.

Explanation of symbols

S segment, S ₁ existing segment, S ₂ connecting segment, S ₃ , S ₄ horizontal segment, S ₅ vertical segment, 1a, 1b axial wall, 2a-2d steel pipe, 3a, 3b main girder plate, 4 restraint plate, 5 Outer peripheral side skin plate, 8 joint plate, 8a, 8b Short pipe (steel pipe), 9 Box-shaped part, 10 Inner peripheral side skin plate, 13 First axial joint member, 14 Second axial joint member, 17 Stop projection, 19 engagement step, 20 circumferential joint member, 23 guide groove, 24 engagement portion, 26 engagement projection, 32, 33 engagement projection, 40 concrete.

Claims (17)

A composite segment that connects a plurality of tunnels in the circumferential direction and the axial direction to construct a tunnel wall,
A pair of axial walls provided at predetermined intervals in the axial direction of the tunnel, a skin plate joined to the outer peripheral side or the outer peripheral side and the inner peripheral side of the axial wall, and both ends of the axial wall and the skin plate Consisting of a circumferential wall joined to the part and concrete placed in an area surrounded by these,
The pair of axial walls are formed by a steel pipe provided on the inner peripheral side or the outer peripheral side and a main girder plate joined to the outer peripheral side or the inner peripheral side of the steel pipe, and the circumferential wall is formed by the shaft. A synthetic segment comprising a joint plate provided with a short pipe on the inner surface side corresponding to a steel pipe of a directional wall . The synthetic segment according to claim 1 , wherein the pair of axial walls are formed by steel pipes provided on an inner peripheral side and an outer peripheral side, and a main girder plate joined between the steel pipes. 3. The synthetic segment according to claim 1, wherein the short pipe is formed of a steel pipe having substantially the same outer dimensions as the steel pipe of the axial wall and a length substantially the same as a distance between the steel pipes. The composite segment according to any one of claims 1 to 3 , wherein a plurality of reinforcing means are provided between the pair of axial walls. Claim 1-4, characterized in that the provided skin plate of concrete設面, or the axial wall, the circumferential wall and slip into all or part of the concrete設面reinforcing means skin plate The synthetic segment according to any one of the above. The synthetic segment according to any one of claims 1 to 5 , wherein the steel pipe is filled with concrete. The synthetic segment according to claim 6, wherein a constraining plate is joined to both ends of the steel pipe filled with concrete. The synthetic segment according to any one of claims 1 to 7 , wherein a high-fluidity concrete having a maximum aggregate size of 20 mm, a slump flow of 60 cm ± 10 cm, and an air amount of 2% ± 1% is used as the concrete. . The synthetic segment according to any one of claims 1 to 8 , wherein an axial connection means is provided on the main girder of the pair of axial walls. A plurality of first axial joint members provided at predetermined intervals in the circumferential direction of the main girder of one axial wall, and the first girder plate of the other axial wall. The synthetic segment according to claim 9, comprising a second axial joint member provided in correspondence with the axial joint member. The first axial joint member is formed of a steel pipe or a round steel bar having approximately one half of the longitudinal direction protruding from one main girder plate and joined to the main girder plate, and the second axial direction the coupling member, to claim 10, characterized in that open is joined to the main girder to the first axial coupling member is formed of steel pipe is fitted to the main girder their ends other Synthetic segment as described. The synthetic segment according to claim 10 or 11, wherein a retaining means is provided on the first axial joint member and the second axial joint member. The synthetic segment according to any one of claims 1 to 12 , wherein circumferential coupling means are provided at both ends of the synthetic segment. The circumferential connecting means includes a main body part having a guide groove formed between side walls having a rectangular cross section provided in the longitudinal direction on both sides of the rectangular width direction, and the guide on one end side of the main body part. An engaging portion formed by covering the groove with an engaging steel plate and formed by the engaging steel plate and the guide groove, and being attached to the guide groove in the vicinity of the other end of the main body, and from the upper surface of the side wall to the guide groove The synthetic segment according to claim 13, wherein the synthetic segment is formed by a circumferential joint member including an engagement protrusion protruding at a height substantially equal to the depth of the joint. The synthetic segment according to claim 14, wherein a retaining member is provided on the circumferential joint member. According to claim 14 or 15, wherein the circumferential coupling member, the engaging projection on both ends of the synthesized segment instead of the circumferential wall or circumferential wall is mounted so that the position of the opposite Composite segment. The synthetic segment according to any one of claims 1 to 16 , wherein the synthetic segment is formed in a substantially arc shape along a circumferential direction of the tunnel.

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