JP4794423B2 - Synthetic segment connecting structure and synthetic segment having the same - Google Patents

Description

  The present invention relates to a composite segment connecting structure and a composite segment including the same, and more particularly to a composite segment connecting structure having an axial wall formed of a steel pipe and a composite segment including the same.

  As a conventional tunnel segment, a pair of axial walls along the tunnel axial direction 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 In order to configure, the peripheral wall along the tunnel circumferential direction, presents a box shape consisting of a wall of a pair of vertical ribs of the same shape as the circumferential wall, and in the circumferential wall is a portion where the circumferential wall is arranged in the tunnel radial direction A part made of ductile cast iron is formed by forming a flange portion projecting in the tunnel axial direction over the entire or almost entire area of the tunnel circumferential length of the circumferential wall on the opposite side portion (for example, patent document) 1).

Japanese Patent Laid-Open No. 2003-307100 (pages 3 and 4, FIG. 1-7)

In the tunnel segment of Patent Document 1, the curvature of the segment is realized by cutting the steel plate into a substantially fan shape and welding it, or by separately producing and installing a substantially fan-shaped cast iron. This method not only increases the production cost, but also has a problem that the production takes time.
Further, in addition to the segment body structure, it is necessary to separately install a plurality of segment joints and ring joints that are arranged in the circumferential direction of the tunnel and in the tunnel axis direction and are connected to each other.

  Furthermore, in order to withstand the casting load of concrete during the production of the segments, a number of stiffeners that suppress the out-of-plane deformation of the back plate or skin plate that constitutes the peripheral wall along the tunnel circumferential direction 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.

  In order to solve the above-mentioned problems, the present invention comprises a steel pipe for the axial wall so that the structure is simple, the number of components is small, the manufacturing is simple, the cost can be reduced, and the workability is improved. It is an object of the present invention to provide a connecting structure of synthetic segments and a synthetic segment having the same.

  The synthetic segment connection structure according to the present invention includes a pair of steel pipes that are provided at predetermined intervals in the axial direction of the tunnel to form an axial wall, and either or both of the outer peripheral side and the inner peripheral side of the pair of steel pipes. A pair of steel pipes, comprising a skin plate joined to one side, a joint plate joined to both ends of the steel pipe and the skin plate to form a circumferential wall, and concrete placed in a region surrounded by the joint plate In addition, a circumferential direction connecting means and an axial direction connecting means are provided directly or via a member, and the composite segment is configured to be connected in the circumferential direction and the axial direction of the tunnel.

  In addition, the synthetic segment connection structure according to the present invention includes the opening in which the circumferential connection means is provided by cutting off the inner peripheral flanges on both ends of the pair of steel pipes, and the end of the steel pipe. Each of which has a joint box formed by a joint plate that is provided with a bolt insertion hole and is joined to both ends of the pair of steel pipes. A bolt is inserted into the bolt insertion hole of the joint box, and both are integrally connected by a nut.

  Further, in the connecting structure of the composite segments according to the present invention, the circumferential connecting means includes a main body portion in which a guide groove is formed between side walls having a rectangular cross section provided at a predetermined interval, and one of the main body portions. An engagement portion formed between the guide groove and the engagement steel plate on the end portion side, and attached to the guide groove in the vicinity of the other end portion of the main body portion, and the depth of the guide groove from the upper surface of the side wall A circumferential joint member that protrudes at an approximately equal height and is joined to the joint plate so that the engagement projections are located on opposite sides in the axial direction. The engaging protrusions of the adjacent joint segments of the adjacent synthetic segments are respectively fitted into the guide grooves of the other side so that the engaging protrusions are locked to the engaging parts, and the two are integrally connected. It is what.

  The circumferential connecting member is provided with a retaining means.

  In the connecting structure of the composite segment according to the present invention, the above-described axial connecting means is provided with bolt insertion holes at predetermined intervals in the longitudinal direction of the outer flange, and the openings are formed on the outer circumferential side of the pair of steel pipes. Each having a substantially U-shaped axial joint member joined together, the axial joint members of adjacent composite segments abutting or approaching each other, the bolts are inserted into the bolt insertion holes, and both are connected by nuts. Are connected together.

  Moreover, the synthetic segment connecting structure according to the present invention is the above-described axial connecting means comprising a steel pipe or a round steel bar, and approximately one half of the longitudinal direction protrudes from the outer web of one steel pipe into the steel pipe. A first axial joint member joined and a steel pipe into which the first axial joint member is inserted, and an end portion of the first axial joint member opens into the outer web of the other steel pipe and is joined to the steel pipe. Two axial joint members, and the first axial joint member is fitted into the second axial joint member of the adjacent composite segment so that they are integrally connected.

  The first axial joint member and the second axial joint member are provided with retaining means.

  The composite segment according to the present invention is joined to a pair of steel pipes that are provided at predetermined intervals in the axial direction of the tunnel to form an axial wall, and either or both of the outer peripheral side and the inner peripheral side of the pair of steel pipes. A steel plate and a joint plate that is joined to both ends of the steel pipe and the skin plate to form a circumferential wall, and a concrete that is in contact with a region surrounded by the steel plate, and the pair of steel pipes In addition, either or both of the circumferential direction coupling means and the axial direction coupling means are provided directly or via a member.

  The synthetic segment according to the present invention is obtained by filling the pair of steel pipes with concrete.

  According to the present invention, a segment in which the tunnel axial wall is formed of a steel pipe can be connected firmly and reliably in the circumferential direction of the tunnel and / or in the tunnel axial direction by a simple structure connecting means, thereby reducing costs. In addition to being able to do so, the workability is improved and the reliability can be improved.

  As shown in FIG. 7, a composite segment according to the present invention (hereinafter simply referred to as a segment) is formed by connecting a plurality of segments S in a ring shape by a circumferential connecting means in a tunnel excavated in the ground. A direction wall is constructed, and the tunnel circumferential wall is constructed by sequentially connecting the tunnel circumferential wall in the tunnel axial direction by the axial coupling means.

An example of the connecting procedure of the segment S in the tunnel circumferential direction and the axial direction will be described with reference to FIG. In the circumferential direction of the segment S ₁ installed on the peripheral wall of the tunnel, a segment S ₂ (hereinafter referred to as a first existing segment) is connected by a circumferential connecting means, and in the axial direction of the segment S ₁ , The segment S ₃ (hereinafter referred to as a second existing segment) is connected by the axial connecting means.

In such a state, when the next segment S ₄ (hereinafter referred to as a consolidated segment) is linked to the segment S ₁ and / or the first existing segment S ₂ and the second existing segment S ₃ , the _fourth circumferential wall along the second circumferential direction wall of the existing segment S ₃ pushing in the direction of the arrow, the segment S ₁ and / or the first axial wall of the existing segment S _2, connected by axial connecting means connecting the axial wall of the segment S _4. At this time, the axial wall on the near side of the connecting segment S ₄ is positioned substantially on the same plane as the axial wall on the near side of the second existing segment S ₃ as indicated by a broken line.

Further, at the same time when the connecting segment S ₄ is pushed in, or after the connecting segment S ₄ is connected to the segment S ₁ and / or the first existing segment S ₂ , the circumferential direction of the second existing segment S ₃ and the connecting segment S ₄ The walls are connected by circumferential connecting means. Incidentally, the pushing when the the connection segment S _4, can be utilized propulsion jacks that are mounted on the shield machine used in tunnel excavation.
The present invention relates to a connecting structure in the tunnel circumferential direction and the axial direction of the segment as described above, and a segment including the same.

[Embodiment 1]
FIG. 1 is an explanatory diagram of a segment having a connection structure in the tunnel circumferential direction according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is an explanatory view of a joint box provided on the steel pipe of FIG. 1, and FIG. 5 is a right side view and a BB cross-sectional view of FIG.

  1 and 2, reference numerals 1a and 1b denote a pair of square steel pipes (hereinafter simply referred to as steel pipes) constituting the tunnel axial wall of the composite segment S, and have a radius r (see FIG. 7) along the circumferential direction of the tunnel. It is bent into a substantially arc shape and filled with concrete 60. In addition, although steel pipe 1a, 1b can generally use a commercially available thing, since there are restrictions in a magnitude | size, plate | board thickness, etc., it may not be applicable to an axial direction wall. 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. A steel tubular axial wall may be formed by welding or the like, and when a polygonal axial wall is formed, end edges of a plurality of steel plates may be welded ( The same applies to other embodiments).

  The steel pipes 1a and 1b are arranged at a predetermined interval D in the tunnel axis direction, and the outer peripheral side skin plate 10 is welded and integrated with the outer peripheral side of the steel pipes 1a and 1b or between them. Although not shown, a diaphragm or a round bar may be joined at a predetermined interval in the longitudinal direction between the steel pipes 1a and 1b so as to maintain the interval therebetween. Moreover, although not shown in figure, you may join an inner peripheral side skin plate also to the inner peripheral side of steel pipe 1a, 1b, or between them, and the inner peripheral side of these outer peripheral side skin plates 10 and inner peripheral side skin plates, A plurality of rows of studs 11 or concrete fixing members such as mesh bars are provided at predetermined intervals in the longitudinal direction.

  15a and 15b are joint plates constituting a circumferential wall welded to both ends of the steel pipes 1a and 1b and the outer skin plate 10, and bolt insertion holes 16 are provided corresponding to the ends of the steel pipes 1a and 1b, respectively. It has been. A concrete 60 is placed in a box-shaped region 17 surrounded by the steel pipes 1a and 1b, the outer peripheral side skin plate 10 and the joint plates 15a and 15b and having an inner peripheral side opened. In addition, when the inner peripheral side skin plate is also bonded to the inner peripheral side, the box-shaped region has a closed cross section. In this case, first, one of the joint plates (for example, 15b) is bonded first, After filling the concrete 60 into the box-shaped region 17 from the opened end of the metal and solidifying the concrete 60, the other joint plate 15a may be joined, or the joint plate 15a or 15b may be used for pouring concrete. Holes may be provided, and both ends may be closed with joint plates 15a and 15b, and then concrete 60 may be injected and filled from the concrete injection holes.

  By the way, in this Embodiment, the joint boxes 2a and 2b which form the connection means of the circumferential direction are provided in the both ends of the steel pipes 1a and 1b. As shown in FIG. 3, the joint boxes 2a and 2b are arranged at both ends of steel pipes 1a and 1b (hereinafter, sometimes indicated by reference numeral 1) as shown in FIGS. The inner peripheral side wall (hereinafter referred to as the inner peripheral flange) on the part side is cut off and opened (openings 3a, 3b), and the opposite side from the both ends of the openings 3a, 3b (the central part side in the longitudinal direction of the steel pipe 1) ), The partition plates 4a and 4b having the holes 5 are welded together to close the space between the openings 3a and 3b.

  Then, a hose (not shown) is inserted into the hole 5 provided in the partition plate 4a (or 4b), the hole 5 of the other partition plate 4b (or 4a) is closed, and both partition plates 4a, 4b and therefore the concrete 60 (see FIG. 2) is filled into the steel pipe 1. In this way, between the openings 3a and 3b is closed with the partition plates 4a and 4b, and the concrete 60 is filled in the steel pipe 1, whereby the steel pipe 1 and the concrete 60 are integrated, and the bending strength of the steel pipe 1 is increased. Bending rigidity can be improved.

  After the concrete 60 filled in the steel pipe 1 is solidified, as shown in FIG. 1, the outer skin plate 10 is joined to the outer circumference side of both the steel pipes 1a and 1b, and then the joint plates 15a and 15b are joined to both ends thereof. Join. As a result, as shown in FIGS. 4 and 5, at both ends of the steel pipe 1, the outer peripheral flange and the webs, the partition plates 4a and 4b and the joint plates 15a and 15b are surrounded, and the inner peripheral side is opened (3a and 3b). ) Joint boxes 2a and 2b are formed. At this time, the bolt insertion holes 16 provided in the joint plates 15a and 15b open into the joint boxes 2a and 2b. The filling of the concrete 60 into the steel pipe 1 may be performed after the skin plate 10 and the joint plates 15a and 15b are joined to the steel pipe 1.

In this case, on the inner surface side (box-shaped region 17 side) of the joint plates 15a and 15b, a short pipe whose outer shape is substantially equal to or smaller than the steel pipes 1a and 1b and whose length is substantially equal to the distance D between the steel pipes 1a and 1b. The short pipe is inserted between the ends of both steel pipes 1a and 1b, and the joint plates 15a and 15b (including the short pipe) are attached to both ends of the steel pipes 1a and 1b and the outer skin plate 10. You may join.
By comprising in this way, the rigidity of joint board 15a, 15b can be improved, and the space | interval D of both the steel pipes 1a, 1b can be hold | maintained.

  By the way, the concrete 60 filled in the steel pipes 1a and 1b and the box-shaped region 17 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, the concrete 60 was able to be reliably filled into the steel pipes 1a and 1b and every corner of the box-shaped region 17 (the same applies to other embodiments).

Next, an example of the connection procedure of the segments S configured as described above in the tunnel circumferential direction will be described with reference to FIG. 8 described above, the connecting segment S ₄ is connected to the first tunnel axis direction of the existing segment S _2, as shown in FIG. 6 (a), the joint plate 15b and the second of the existing segment S ₃ The bolt insertion hole 16 provided in both is aligned with the joint plate 15a.

In this state, as shown in FIG. 6 (b), the bolt 8 is inserted from the opening 3b of one joint box (for example, 2b), and is inserted into the bolt insertion holes 16 provided in both joint plates 15b and 15a. By tightening the nut 9 has been inserted through the opening 3a of the other joint boxes 2a screwed with the bolt 8, connecting segment S ₄ is firmly fixed to the tunnel circumferential direction of the second of the existing segment S _3, Connected.
In this case, the joint plate 15a, the diameter of the bolt insertion holes 16 provided in 15b, if made slightly larger than the diameter of the bolt 8, axial or between the connection segment S ₄ and the second of the existing segment S ₃ Even when there is a slight shift in the circumferential direction, the bolt 8 can be easily inserted. Note that the nut 9 may be welded in advance to the joint box 2a, 2b side of the bolt insertion hole 16 of one of the joint plates 15a, 15b.

In this way, after connecting the connection segment S ₄ in the circumferential direction of the second existing segment S ₃ with the plurality of bolts 8 and nuts 9, as shown in FIG. If the concrete 60 is filled, the connection between the two is completed.

  According to the present embodiment, in the segment S in which the tunnel axial wall is constituted by the steel pipes 1a and 1b, the inner circumference is provided between the both ends of the steel pipes 1a and 1b and the joint plates 15a and 15b joined thereto. The joint boxes 2a and 2b that are open on the side are provided, and the joint plates 15a and 15b that are positioned in contact with or adjacent to the adjacent segment S are inserted into the bolt insertion holes 16 provided in the joint plates 15a and 15b, Since they are fixed and connected together, adjacent segments S can be firmly and reliably connected in the circumferential direction of the tunnel by a connecting means having a simple structure. For this reason, not only can the cost of the connecting means be reduced, but also the workability can be improved and the reliability can be increased.

[Embodiment 2]
FIG. 9 is an explanatory diagram of a segment provided with a connection structure in the tunnel circumferential direction according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
This embodiment has joint boxes 2a and 2b that are formed in a substantially arc shape along the circumferential direction of the tunnel and open to the inner peripheral side at both ends, and concrete 60 is filled between the joint boxes 2a and 2b. Between the pair of steel pipes 1a and 1b, a plurality of steel pipes 1c and 1d (two cases are shown in the figure) filled with concrete 60 are disposed, and the adjacent steel pipes 1a to 1b are disposed. 1d is welded and integrated to form a segment S by joining joint plates 15a and 15b having bolt insertion holes 16 at both ends.

  The procedure for connecting adjacent segments in the tunnel circumferential direction and the effect thereof according to the present embodiment are substantially the same as those in the first embodiment. In addition, according to the segment S which concerns on this Embodiment, there are few components and it can manufacture easily and can reduce cost, and can also resist the pushing force of the jack at the time of construction.

[Embodiment 3]
FIG. 10 is an explanatory diagram of a segment having a connection structure in the tunnel circumferential direction according to the third embodiment of the present invention. 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, the steel pipes 1a and 1b constituting the axial wall are filled with concrete, and a skin plate 10 (not shown) is joined to the outer peripheral side thereof, and the steel pipes 1a and 1b and the skin are connected. Joint plates 15 a and 15 b are joined to both ends of the plate 10. And concrete 60 is cast in box-like field 17 formed by these.

In FIG. 10, reference numeral 20 denotes a circumferential joint member provided at both ends in the tunnel 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 is formed by, for example, joining a rectangular steel pipe, a channel-shaped steel material, or a steel bar having a square cross section in the longitudinal direction on both sides of the strip-shaped width direction, and joining a joint plate therebetween to form the guide groove 23. It may be provided.
The length L of the main body 21 is approximately equal to or slightly shorter than the width of the segment S, and the width W is selected to be approximately equal to the thickness of the segment S and hence the width of one side of the steel pipe 1.

  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.

Numeral 26 is an engaging projection attached to the guide groove 23 on the other end side of the main body 21, and as shown in FIG. 12, 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. 10, the circumferential joint member 20 configured as described above is welded and joined to one joint plate (for example, 15 a) of the segment S with the engaging portion 26 facing forward in parallel with this, Install. The other joint plate 15b of the segment S has a circumferential joint member 20 having the same structure as that of the above-described circumferential joint member 20, with the engaging portion 26 on the back side, and thus joined to the joint plate 15a. The directional coupling member 20 is joined in the same manner as described above so as to be opposite to the engaging portion 26 of the directional coupling member 20.

Next, an example of the connecting 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 FIG. S ₃ is a second existing segment already installed in the circumferential direction of the tunnel described in FIG. 8 (hereinafter simply referred to as an existing segment), and S ₄ is a connecting segment connected to this existing segment S ₃ .

First, as shown in FIG. 13 (a), the connecting segment S ₄ 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 ₃ and S ₄ 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.

The connecting segment S ₄ presses the arrow b direction (axial direction of the tunnel), as shown in FIG. 13 (b), the engaging portion 24a of the engaging projection 26a of the connecting segment S ₄ of the existing segment S ₃ to the engaging projection 26b of the coupling segment S ₄ fitted respectively in the engaging portion 24a of the existing segment S _3, substantially the same plane axially wall 1b of the connecting segment S ₄ is an axial wall 1b of the existing segment S ₃ Push it in until it is on top. At this time, the engaging portions 29a and 29b of the engaging projections 26a and 26b of both segments S ₃ and S ₄ are engaged with the mating engaging steel plates 25b and 25a.
Thus, connection of the connecting segments S ₄ to the existing segment S ₃ is completed. In the same manner, the tunnel circumferential wall is constructed by sequentially connecting the connecting segments to the existing segments.

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 ₃ along the guide groove 23b of the coupling segment S ₄ 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 ₄ is fitted to the engagement portion 24a of the existing segment S _3, 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 ₄ is existing segments It is firmly connected to the S _3.

FIG. 14 is an explanatory diagram showing another example of the present embodiment. In this example, as shown in FIG. 14 (a), the engagement protrusion of the circumferential joint member 20a provided in one segment S ₃ (in the following description, the existing segment S ₃ and the connecting segment S ₄ 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 ₄ in the circumferential direction fitting member 20b of the guide groove 23b At the bottom, when the segments S ₃ and S ₄ are connected, the engagement protrusion 32 provided on the engagement protrusion 26a is locked at the position where the engagement protrusion 32b is engaged, and becomes higher from the engagement protrusion 26b side toward the engagement portion 24b. 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 ₄ circumferential joint member 20b, and is provided in the existing segment S ₃ 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 ₄ to the existing segment S _3, as shown in FIG. 14 (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 ₄ tunnel It is possible to reliably prevent the slipping out in the axial direction.

  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.

For connecting the segments S in the circumferential direction of the tunnel, the circumferential joint of the connecting segment S ₃ 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 _3. 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 ₄ Therefore, the construction is very easy.

Furthermore, connecting segment S ₄ with the existing segments S ₃ are both circumferential joint member 20a, 20b of the engaging projection 26a, 26b is fitted in the guide grooves 23b, 23a of the other party, the locking portion 29a, 29b 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 ₄ is prevented from getting out to the push-in direction and the push-in direction perpendicular to the direction.

[Embodiment 4]
FIG. 15 is an explanatory view provided with a connecting structure in the tunnel axis direction according to Embodiment 4 of the present invention, and FIG. 16 is a cross-sectional view taken along the line CC in FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The segment S according to the present embodiment has substantially the same structure as the segment S according to the first embodiment, but the joint boxes 2a and 2b are not provided at both ends of the steel pipes 1a and 1b. The axial joint members 40a and 40b are provided on the outer wall (hereinafter referred to as the outer web) of 1b in the tunnel axial direction.

The axial joint members 40a and 40b are made of, for example, channel steel having a substantially U-shaped cross section. The axial joint members 40a and 40b have substantially the same length as the steel pipes 1a and 1b and the height is the same as or slightly higher than the web height of the steel pipes 1a and 1b It is formed low and is bent into a substantially arc shape with the opening 42 on the inner peripheral side corresponding to the shape of the steel pipes 1a and 1b.
Then, one or a plurality of bolt insertion holes 41 are provided at predetermined intervals in the longitudinal direction of the one piece (hereinafter referred to as the outer flange).

  The axial joint members 40a and 40b configured in this manner are brought into contact with the outer web of the steel pipes 1a and 1b with the other end (hereinafter referred to as an inner flange) abutting the opening 42 on the inner peripheral side, and integrated by welding. Join. And the joint plates 15a and 15b which are circumferential walls are joined to the both ends of the steel pipes 1a and 1b or both ends of the steel pipes 1a and 1b and the axial joint members 40a and 40b, and the steel pipes 1a and 1b and the outer peripheral side skin plate. A concrete S is formed by placing concrete 60 in a box-shaped region 17 formed by the joint plate 15 and the joint plates 15a and 15b and having axial joint members 40a and 40b. In addition, after constituting the segment S, the axial joint members 40a and 40b may be joined to the outer webs of the steel pipes 1a and 1b.

In this embodiment configured as described above, by connecting procedure described in FIG. 8, pushing the segments S ₁ and the first connecting segment S ₄ toward the existing segment S ₂ in the direction of the arrow. Then, as shown in FIG. 17, in the axial direction the joint member 40a joined to the first of the existing segment S ₂ of the steel pipe 1a, an axial coupling member 40b joined to the steel pipe 1b of the connecting segments S ₄ abut or close The bolt insertion holes 41 provided in the respective outer flanges are aligned.

Next, the bolt 8 is inserted from the opening 42 of the axial joint member 40a or 40b, and the bolt 8 is inserted into both bolt insertion holes 41 and inserted from the other opening 42 as in the case of the first embodiment. The nut 9 is screwed to fix the two axial joint members 40a and 40b integrally. As a result, the connecting segment S ₄ is connected in the axial direction of the first existing segment S ₂ . In addition, you may fill the axial direction joint members 40a and 40b with the concrete 60 from the opening part 42 after a connection.
According to the present embodiment, since the segments S adjacent in the tunnel axis direction can be easily and reliably connected with a simple structure, not only the cost of the connecting means can be reduced, but also the workability can be improved.

[Embodiment 5]
FIG. 18 is a perspective view of a composite segment having a connection structure in the tunnel axis direction shown with a part omitted according to Embodiment 5 of the present invention, and FIG. 19 is a DD cross-sectional view thereof. In the following description, the segment according to the first embodiment is provided with a tunnel axial connection structure, but the inner peripheral skin plate 10a is further joined to the inner peripheral side. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In both figures, one of the steel pipe segment S (e.g., 1a) in the axial direction of the plurality of first mounting holes 45 of the inner diameter d ₁ is provided at a predetermined interval, on the other steel pipe 1b, the first mounting hole 45 opposite to the, an inner diameter d ₂ is an inner diameter greater than the second mounting hole 46 of the first mounting hole 45 is provided. The number of the first and second mounting holes 45 and 46 is not particularly limited, but is desirably an even number of 4 or more.

  47 is a first axial joint member that constitutes an axial coupling means that is inserted into the first mounting hole 45 provided in the steel pipe 1a to the vicinity of the central portion in the longitudinal direction and welded to the outer web of the steel pipe 1a; Reference numeral 48 denotes an axial connecting means which is inserted into a second mounting hole 46 provided in the steel pipe 1b until its end is substantially flush with the outer surface of the outer web of the steel pipe 1b and is welded to the outer web. It is the 2nd axial direction joint member to do.

An example of the first and second axial joint members 47 and 48 is shown in FIG. The first axial joint member 47 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 45 provided in the steel pipe 1a, and the outer periphery of its tip is chamfered. . The second axial joint member 48 is shorter in length than the first axial joint member 47 (for example, about one half), and the second attachment in which the outer diameter d ₄ is provided in the steel pipe 1b. The pipe 46 is made of a steel pipe (steel pipe) that is substantially equal to the inner diameter d _{2 of the} hole 46 and whose inner diameter d ₅ is substantially equal to the outer diameter d _{3 of} the first axial joint member 47. The first axial joint member 47 may be formed of a round steel bar.

  In manufacturing the segment S having the first and second axial joint members 47 and 48, the first mounting hole 45 and the second mounting hole 46 are provided as in the case of the first embodiment. Then, the steel pipes 1a and 1b bent into a circular arc shape with a predetermined radius r are arranged at a predetermined interval D, an outer peripheral side skin plate 10 is provided on the outer peripheral side, and an inner peripheral side skin is provided on the inner peripheral side as required. The plate 10a is welded and the opening at one circumferential end is closed with the joint plate 15a.

  Then, before filling the steel pipes 1a and 1b with the concrete 60, the first axial joint members 47 are respectively inserted into the first mounting holes 45 provided in the steel pipe 1a to the vicinity of the central portion in the longitudinal direction. Welded to. Further, the second axial joint members 48 are respectively inserted into the second mounting holes 46 provided in the steel pipe 1b until the end portions thereof are substantially flush with the surface of the outer web of the steel pipe 1b, and welded to the steel pipe 1b. After joining, concrete 60 is filled in the steel pipes 1a and 1b. As a result, the first and second axial joint members 47 and 48 are firmly fixed by welding to the steel pipes 1a and 1b and the concrete 60 filled therein, as shown in FIG. 19 (b). The

  Next, the concrete 60 is filled into the box-shaped region 17 from the opening at the other end in the circumferential direction, and after the concrete 60 is solidified, the opening is closed by the other joint plate 15b. The steel pipes 1a and 1b provided with the first and second axial joint members 47 and 48 are first filled with the concrete 60, and then the outer peripheral side or the outer peripheral side and the inner peripheral side of both the steel pipes 1a and 1b. The skin plate 10 (or 10 and 10a) is joined, the joint plate 15a (or 15b) is joined to both end portions (or one end portion), and the concrete 60 is applied to the box-shaped region 17 formed by these. You may set up.

Next, an example of an axial connection procedure of the segments S provided with the axial joint members 47 and 48 as described above will be described with reference to FIG.
In FIG. 21A, S ₂ is an existing segment installed in the tunnel described in FIG. 8, S ₄ is a connecting segment connected in the tunnel axis direction of this existing segment S ₂ , and the existing segment S ₂ is the second segment. steel pipe 1b axial coupling member 48 is provided is located on the front side, carrying the connecting segment S ₄ the first axial coupling member 47 steel pipe 1a provided is to face the existing segment S ₂ To do. Then, the connecting segment S ₄ is moved in the direction of the arrow to align the first axial joint member 47 and the second axial joint member 48, and the connecting segment S ₄ is continuously pushed in the direction of the arrow to move the first axial direction. When the joint member 47 is fitted into the second axial joint member 48, both are integrally connected as shown in FIG.

  FIG. 22 is an explanatory view showing another example of the first axial joint member 47 and the second axial joint member 48. Slits 49 are provided at substantially equal intervals on the circumference from the substantially central part in the longitudinal direction of the first axial joint member 47 to the tip part side (the part protruding from the steel pipe 1a or 1b), and elasticity is provided respectively. A given elastic piece 50 is formed, and a locking projection 51 having an inclined surface on the tip side is provided on the outer periphery of the tip of the elastic piece 50. Further, the inner peripheral surface on the tip end side of the second axial joint member 48 is enlarged in diameter (expanded portion 52), and a locking step portion 53 is provided corresponding to the locking projection 51, These constitute the retaining means.

When the first axial joint member 47 is inserted into the second axial joint member 48 in order to connect the connection segment S ₄ to the existing segment S ₂ , the locking projection 51 is connected to the second axial joint member 48. However, since the elastic piece 50 is bent and reduced in diameter, it can be easily inserted. When further inserted and the locking projection 51 reaches the diameter-expanded portion 52 of the second axial joint member 48, each elastic piece 50 is returned to its original state and expanded in diameter, as shown in FIG. The stop projection 51 is locked to the locking step 53.
Thus, the first axial coupling member 47 does not get out of the second axial coupling member 48, connecting segment S ₄ are firmly connected to the existing segment S _2. The locking protrusion 51 may be formed by a protrusion provided on each elastic piece 50.

According to the present embodiment, in order to connect the segment S in the axial direction of the tunnel, the first axial joint member 47 is provided in one steel pipe (for example, 1a), and the second shaft is provided in the other steel pipe 1b. Since the directional joint member 48 is provided, the connecting segment S ₄ is inserted into the second axial joint member 48 of the existing segment S ₂ by inserting the first axial joint member 47 of the connecting segment S ₄ into the existing segment S. Can be connected to ₂ with one touch. In this case, between the first axial coupling member 47 and the second axial coupling member 48, for example, FIG. 22, by providing the retaining means as described in FIG. 23, the connecting segment S ₄ it can be firmly connected by the existing segment S _2. FIGS. 22 and 23 show an example of the slip-out prevention means, and the present invention is not limited to this, and other means may be used.

According to this embodiment, since the axial connection means steel pipe 1a, a 1b, the tunnel axis direction is easy to manufacture existing segment S _2, the connecting segments S ₄ can be connected by 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.

In each of the above-described embodiments, the steel pipes 1a and 1b constituting the segment S are formed by bending into a circular arc shape corresponding to the radius r of the tunnel having a circular cross section. These steel pipes may be divided into a plurality of parts, and these may be welded to form steel pipes 1a and 1b that are axial walls approximated in an arc shape.
The present invention can also be applied to a segment S constructed of a tunnel wall of a tunnel having an elliptical cross section, for example. In this case, the arc-shaped bending radius r may be changed according to the installation position of the segment S in the tunnel circumferential direction.

Furthermore, the segment S according to the present invention can also be implemented in a tunnel with a square cross section. In this case, the segment S may be formed into a lithographic shape without bending the steel pipes 1a, 1b and the like.
In addition, in said embodiment, although the case where the concrete 60 was filled in the steel pipes 1a, 1b or 1a-1d was shown, even if it omits filling of the concrete 60 into some steel pipes or all the steel pipes. Good.

In the above description, the first to third embodiments show the segment S having a connection structure in the tunnel circumferential direction, and the fourth and fifth embodiments show the segment S having a connection structure in the tunnel axis direction. The segment S can be configured by appropriately combining these.
Further, the circumferential connection structure according to any one of the first to third embodiments may be applied to the tunnel circumferential connection structure, and a known connection structure may be appropriately employed as the tunnel axial connection structure. The axial connection structure of the fourth or fifth embodiment may be applied to the tunnel axial connection structure, and a known connection structure may be appropriately adopted as the tunnel circumferential connection structure.

It is explanatory drawing of the segment provided with the connection structure of the tunnel circumferential direction which concerns on Embodiment 1 of this invention. It is AA sectional drawing of FIG. It is explanatory drawing of the principal part of the steel pipe of FIG. It is explanatory drawing of the joint box provided in the steel pipe of FIG. It is the right view of FIG. 4, and BB sectional drawing. It is explanatory drawing which shows the connection procedure of the circumferential direction of the segment of FIG. It is explanatory drawing which shows the state which connected the segment of FIG. 1 in the tunnel circumferential direction. It is explanatory drawing of the procedure which connects a segment to a tunnel axial direction and the circumferential direction. It is explanatory drawing of the segment provided with the connection structure of the tunnel circumferential direction which concerns on Embodiment 2 of this invention. It is explanatory drawing of the segment provided with the connection structure of the tunnel circumferential direction which concerns on Embodiment 3 of this invention. It is a perspective view of the circumferential direction coupling member of FIG. 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 the segment of FIG. It is operation | movement explanatory drawing of the circumferential direction coupling member provided with the prevention means from detachment | leave. It is explanatory drawing of the segment provided with the connection structure of the tunnel axial direction which concerns on Embodiment 4 of this invention. It is CC sectional drawing of FIG. It is explanatory drawing which shows the connection state to the axial direction of the segment of FIG. It is explanatory drawing of the segment provided with the connection structure of the tunnel axial direction which concerns on Embodiment 5 of this invention. It is DD sectional drawing of FIG. It is explanatory drawing of an example of the 1st, 2nd axial direction coupling member of FIG. It is explanatory drawing which shows the connection procedure to the tunnel axial direction of the segment of FIG. It is explanatory drawing of 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.

Explanation of symbols

  1a, 1b Steel pipe, 2a, 2b joint box, 4a, 4b partition plate, 8 bolt, 10 outer skin plate, 15a, 15b joint plate, 16, 41 bolt insertion hole, 17 box-shaped region, 20 circumferential joint member , 23 guide groove, 24 engaging portion, 26 engaging protrusion, 32, 33 locking projection, 40a, 40b axial joint member, 47 first axial joint member, 48 second axial joint member, 51 Locking protrusion, 53 Locking step, 60 Concrete, S segment.

Claims (9)

It is a connecting structure of synthetic segments that are connected in the circumferential direction and axial direction of the tunnel to construct a tunnel wall,
A pair of steel pipes provided at predetermined intervals in the axial direction of the tunnel to form an axial wall; a skin plate joined to either or both of the outer peripheral side and the inner peripheral side of the pair of steel pipes; And a joint plate joined to both ends of the skin plate to form a circumferential wall, and concrete placed in a region surrounded by these,
Combining synthetic segments characterized in that the pair of steel pipes are provided with circumferential connecting means and axial connecting means, either directly or via a member, so as to connect the synthetic segments in the circumferential direction and axial direction of the tunnel. Construction.   The circumferential connecting means includes an opening provided by cutting away the inner peripheral flanges on both ends of the pair of steel pipes, and bolt insertion holes are provided corresponding to the ends of the steel pipe, respectively. A joint box formed by joint plates joined to both ends of the steel pipe, and a joint plate of an adjacent synthetic segment is brought into contact with or in close proximity, and a bolt is inserted into the bolt insertion hole of the joint box. The synthetic segment connection structure according to claim 1, wherein both are integrally connected by a nut.   The circumferential connecting means includes a main body portion in which a guide groove is formed between side walls having a square cross section provided at a predetermined interval, and the guide groove and the engaging steel plate on one end side of the main body portion. And an engaging protrusion that is attached to the guide groove in the vicinity of the other end of the main body and protrudes from the upper surface of the side wall at a height substantially equal to the depth of the guide groove. And connecting the circumferential joint member to the joint plate so that the engaging protrusions are located on the opposite sides in the axial direction, and the circumferential joint member of the adjacent composite segment The engaging protrusions of the first and second engagement parts are respectively fitted in the other guide grooves, the engaging protrusions are locked to the engaging parts, and the two are integrally connected. Linkage structure of synthetic segments.   4. The synthetic segment coupling structure according to claim 3, wherein a retaining means is provided on the circumferential coupling member.   The axial connection means is provided with bolt insertion holes at predetermined intervals in the longitudinal direction of the outer flange, and has a substantially U-shaped cross section joined to the outer web of the pair of steel pipes with the opening portion on the inner peripheral side. An axial joint member is provided, the axial joint members of adjacent composite segments are brought into contact with or close to each other, and a bolt is inserted into the bolt insertion hole, and the two are integrally connected by a nut. The connecting structure of the synthetic segment according to any one of claims 1 to 4.   The axial connection means includes a first axial joint member made of a steel pipe or a round steel bar, and having approximately one half of the longitudinal direction protruding from the outer web of one steel pipe and joined to the steel pipe; And a second axial joint member having an end opened to the outer web of the other steel pipe and joined to the steel pipe. The synthetic segment according to any one of claims 1 to 4, wherein the first axial joint member is inserted into the second axial joint member of the segment so as to be connected together. Linked structure.   7. The synthetic segment connecting structure according to claim 6, wherein a retaining means is provided on the first axial joint member and the second axial joint member. A composite segment that is connected in the circumferential direction and axial direction of the tunnel to construct a tunnel wall,
A pair of steel pipes provided at predetermined intervals in the axial direction of the tunnel to form an axial wall; a skin plate joined to either or both of the outer peripheral side and the inner peripheral side of the pair of steel pipes; And a joint plate that is joined to both ends of the skin plate to form a circumferential wall, and a concrete that is in contact with a region surrounded by the joint plate,
A synthetic segment, wherein the pair of steel pipes are provided with either or both of the circumferential direction coupling means and the axial direction coupling means according to any one of claims 2 to 7 directly or via a member.   The synthetic segment according to claim 8, wherein concrete is filled in the pair of steel pipes.

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