JP5245856B2 - Concrete filled steel segment - Google Patents

Description

  The present invention relates to a concrete-filled steel segment used as a lining body in a shield tunnel and configured by filling a steel shell with concrete.

  At the time of construction of a shield tunnel, a shield construction method is generally used in which a cylindrical structure as a tunnel lining body is constructed by connecting a plurality of arc-shaped plate-like segments. As a segment used in this shield method, for example, as shown in FIGS. 10 and 11, a hollow box-shaped steel shell composed of a pair of main girder plates 111, a pair of joint plates 113 and a skin plate 115. A concrete-filled steel segment 101, 102 constituted by filling concrete 141 in 110 is widely known.

  Such a concrete-filled steel segment is connected to other concrete-filled steel segments via joints such as bolts and mechanical joints when constructing a tubular structure as a tunnel lining. They are supposed to be joined together. In the joint part of the joint plate of the concrete filled steel segment where this fitting is provided, the concrete filled steel segment when used as a ground pressure, water pressure or water channel from the outer periphery side of the concrete filled steel segment A large bending moment and tensile load are applied by the water pressure from the inner periphery of the plate. For this reason, a variety of concrete-filled steel segments have been proposed for the purpose of improving the strength of the joint portion against tensile loads and the like acting on the joint portion.

  For example, a concrete-filled steel segment 101 proposed in Patent Document 1 includes a reinforcing plate 125 that is abutted and fixed to a joint plate 113 of a steel shell 110 from the inside, and a concrete 141 as shown in FIG. And an anchor member 151 made of a deformed reinforcing bar embedded therein. One end side of the anchor member 151 is inserted into an insertion hole 132 formed in the vertical rib 131, and the other end side is fixed to the reinforcing plate 125 by welding or the like. As a result, when the tensile load acts on the joint plate 125, the concrete-filled steel segment 101 can be supported by the concrete 141 by adhesion and take a reaction force, and acts on the joint plate 125. The tensile force can be borne by the concrete 141 or the longitudinal rib 131 within the range covered by the anchor member 151.

  Further, in the concrete filling segment 102 proposed in Patent Document 2, as shown in FIG. 11 (a), a plurality of vertical ribs 131 are arranged between the main beam plates 111, and a joint plate 113 and its joint are provided. The steel shell 110 is filled with concrete 141 leaving a space 161 between the vertical ribs 131 adjacent to the plate 113, and L-shaped joint means reinforcing vertical ribs 163 are arranged in the space 161. Yes. In the concrete 141 filled in the steel shell 110 leaving the space 161, a circumferential reinforcing bar 167 substantially embedded in the circumferential direction is embedded. At the time of joining the segments 102 adjacent in the circumferential direction, as shown in FIG. 11B, the joint means reinforcing vertical ribs 163 of the adjacent segments 102 are joined together by a connecting member 165 as a joint fitting. To do. A space 161 between the joint plate 113 and the vertical rib 131 is provided as a work space for arranging the connecting member 165, and transmits a tensile load or the like acting on the joint portion 123 to the circumferential reinforcing bar 167. In addition, the concrete is filled after joining the segments 102 adjacent in the circumferential direction.

JP 2005-76317 A Japanese Patent Laid-Open No. 2005-2095

  By the way, the above-described prior art has problems in the following points.

  Since the segment 101 disclosed in Patent Document 1 takes a reaction force from the concrete 141 due to the adhesion between the anchor member 151 and the concrete 141, the strength of the joint portion 123 to which a joint fitting such as a bolt is attached is the same as that of the concrete 141. This is determined by the adhesion force of the anchor member 151. In order to sufficiently secure the strength of the joint portion 123, it is necessary to increase the length of the anchor member 151 to ensure a sufficient adhesion force. In this case, the anchor member 151 and the other member such as the vertical rib 131 are secured. In order to avoid interference, extra processing such as drilling holes in other members is required, and the segment 101 is expensive accordingly. Further, the adhesion force between the concrete 141 and the anchor member 151 greatly depends on the quality of the concrete 141. However, since the concrete 141 generally has a large variation in quality, strict quality control is required to secure the adhesion force. Therefore, the segment 101 has become expensive.

  Further, in the segment 102 disclosed in Patent Document 2, it is necessary to separately arrange the L-shaped joint means reinforcing vertical ribs 163 for reinforcing the joint portion 123, and the segment 102 is expensive accordingly. It was. In addition, the segment 102 disclosed in Patent Document 2 fills the steel shell 110 with the concrete 141 while leaving the space 161 between the joint plate 113 and the vertical rib 131, and surrounds the tensile load and the like acting on the joint portion 123. In order to transmit it to the directional reinforcing bar 167, it is necessary to fill the space 161 with concrete having the same strength and quality as the filled concrete 141 after joining the segments 102, and the segment 102 has a higher height. It was costly.

  Further, in the segment 102 disclosed in Patent Document 2, it is not clear whether the joint means reinforcing vertical rib 163 and the circumferential reinforcing bar 167 are fixed to each other or not fixed. It did not have the technical idea of transmitting a tensile load or the like acting on the longitudinal ribs 163 to the circumferential reinforcing bars 167 without depending on the adhesion of concrete.

  That is, in the segments 101 and 102 disclosed in any of Patent Document 1 and Patent Document 2, when transmitting a tensile load or the like acting in the vicinity of the joint portion 123 to other parts of the segment, the joint portion 123 has a large variation in quality. Since the structure depends on the adhesion with the nearby concrete, the desired strength at the joint portion 123 is hardly stably exhibited, and the structure has low structural reliability.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is a structure with high structural reliability capable of stably exhibiting desired strength at the joint. Is to provide a concrete-filled steel segment that can be realized with an inexpensive and simple configuration.

  In order to solve the above-described problems, the present inventors have invented the following concrete-filled steel segments after intensive studies.

The invention according to claim 1 is a concrete-filled steel segment constructed by filling concrete into a steel shell composed of a pair of main plate girders, a pair of joint plates, and a skin plate. A plurality of vertical ribs arranged substantially parallel to the tunnel axis direction, a load transmission member arranged in the concrete substantially parallel to the tunnel circumferential direction, and one end side of which is fixed to the vertical rib adjacent to the joint plate, A connecting member fixed at one end to the joint plate and the other end fixed to a vertical rib adjacent to the joint plate, and the load transmitting member passes through the vertical rib adjacent to the joint plate. A protrusion is provided and fixed to the vertical rib .

The invention according to claim 2 is the invention according to claim 1, wherein the connecting member is made of a steel plate-like member, and is spaced from the skin plate via a reinforcing plate fixed to the joint plate. And fixed to the joint plate .

The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the joint plate is attached to a joint fitting for joining the other concrete-filled steel segments adjacent to each other in the tunnel circumferential direction. The concrete filled in the steel shell is a space surrounded by the joint plate, the vertical rib, and the main girder plate between the ends of the joint plate and the vertical rib. A portion excluding a bolt box formed as a work space for attaching a joint fitting to the joint portion at the time of joint work with other concrete-filled steel segments is pre-filled .

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the joint plate is joined to another concrete-filled steel segment adjacent in the circumferential direction of the tunnel. The connecting member is provided over a pair with a predetermined interval so that the joint portion is disposed between the concrete parts, and the concrete filled in the steel shell is A portion in which a cap nut as a joint fitting is fixed in advance inside the joint plate is preliminarily filled .

  In the invention according to claim 1, the joint plate and the vertical rib adjacent to the joint plate are fixed by the connecting member, and one end side of the load transmitting member is fixed to the vertical rib. When a tensile load or bending moment acts on the outer side of the joint plate, the tensile load or the like can be reliably transmitted to the vertical rib and the load transmitting member via the connecting member. . As a result, the tensile load acting on the joint plate can be distributed by being distributed by a part of the concrete or steel shell within the range covered by the vertical ribs and load transmitting members. Strength can be improved. In particular, since the load transmission mechanism between the joint plate and the load transmission member is formed by a structure that does not depend on the adhesion of concrete, it does not depend on the strength or quality of the concrete to exert the desired strength at the joint. A structure with high structural reliability can be realized with an inexpensive and simple configuration.

In the invention according to claim 1 , the load transmitting member is formed with a protruding portion that penetrates the vertical rib and protrudes from the vertical rib. Because it functions as a detent that restrains the movement of the concrete filled in the space surrounded by the joint plate and the main girder plate between the ends of the vertical ribs, and these act as composite beams The strength and rigidity of the joint portion and the circumferential end portion of the segment including the joint portion are improved.

It is a fragmentary sectional bottom view which abbreviate | omits a part of concrete and shows the segment made from concrete inside steel which concerns on this invention. It is the sectional view on the AA line which abbreviate | omits and shows a part of concrete of the concrete-filled steel segment of FIG. It is the BB sectional drawing which abbreviate | omits and shows a part of concrete of the concrete filling steel segment of FIG. It is a plane sectional view showing the state where the concrete inside-packed steel segments adjacent in the tunnel circumferential direction are joined together. It is bottom sectional drawing which shows the state at the time of joining the segments made from concrete filling steel adjacent to a tunnel circumferential direction. It is CC sectional view taken on the line of FIG. (A) is side surface sectional drawing shown about the relationship between the vertical rib adjacent to the joint board of the concrete filling steel segment of FIG. 1, and the one end side of a load transmission member, (b) is the side surface shown about other embodiment. It is sectional drawing, (c) is side sectional drawing shown about other embodiment. (A) is side surface sectional drawing of the concrete filling steel segment shown about other embodiment of a connection member, (b) is side surface sectional view of the concrete filling steel segment shown about other embodiment of a connection member. It is. It is a fragmentary sectional bottom view which abbreviate | omits a part of concrete and shows the concrete inside steel segment of other embodiment. It is bottom sectional drawing which shows the structure of the 1st concrete filling steel segment as a prior art. (A) is side sectional drawing which shows the structure of the 2nd concrete filling steel segment as a prior art, (b) is side sectional drawing which shows the state which joined the segments in the circumferential direction.

  Hereinafter, the form for implementing the concrete filling steel segment which concerns on this invention is demonstrated in detail, referring drawings. In the following, the concrete-filled steel segment according to the present invention is simply referred to as a segment.

  FIG. 1 is a partial cross-sectional bottom view in which a part of the concrete of the segment 1 according to the present invention is omitted. FIG. 2 is a cross-sectional view taken along line AA in which a part of the concrete of the segment 1 shown in FIG. 1 is omitted, and FIG. 3 is a part of the concrete of the segment 1 shown in FIG. FIG. FIG. 4 is a bottom cross-sectional view showing a state in which the segments 1 adjacent in the tunnel circumferential direction are joined together. FIG. 5 is a side sectional view showing a state when the segments 1 adjacent to each other in the tunnel circumferential direction are joined together. 6 is a cross-sectional view taken along the line CC of FIG.

The segment 1 is used for constructing a tunnel lining body such as a shield tunnel configured as a cylindrical structure by joining a plurality of segments. As shown in FIGS. 1 to 3, the segment 1 is formed in an arc plate shape in a side view and is formed in a rectangular shape in a bottom view.

  The segment 1 includes a steel shell 10 that is open on the inner peripheral side and is formed in a hollow box shape, and a concrete 41 that is filled in the steel shell 10.

  The steel shell 10 is disposed substantially parallel to each other in the tunnel axis direction and is extended in the tunnel circumferential direction, and ends of the pair of main girder plates 11 in the tunnel circumferential direction. A pair of joint plates 13 that are disposed between them and extended in the tunnel axis direction; and a skin plate 15 that is disposed in contact with the outer peripheral side ends of the pair of main girder plates 11 and the pair of joint plates 13; It has. The pair of main girder plates 11, the pair of joint plates 13, and the skin plate 15 are each composed of a steel plate or the like, and are fixed to each other by welding or the like. The skin plate 15 forms the outer peripheral surface of the tunnel lining body.

  The main girder plate 11 is provided with a bolt hole for bolt insertion and a mechanical joint (not shown). The segments 1 adjacent to each other in the tunnel axis direction are joined to each other using a joint fitting such as a bolt or a mechanical joint inserted through the bolt hole.

  As shown in FIGS. 4 and 5, the joint plate 13 has bolt holes 14 for bolt insertion at predetermined positions. A bolt 21 </ b> A as a joint fitting 21 for joining the segments 1 adjacent to each other in the tunnel circumferential direction is inserted into the bolt hole 14. A reinforcing plate 25 is brought into contact with the joint portion 23 of the joint plate 13 to which the joining fitting 21 is to be attached, and is fixed by welding or the like. The reinforcing plate 25 resists the load acting on the joint portion 23 and is fixed to improve the strength of the joint portion 23, and is not necessarily attached. The reinforcing plate 25 has bolt holes 14 formed at positions corresponding to the bolt holes 14 of the joint plate 13.

  Of the joint plates 13 on both sides in the tunnel circumferential direction, one of the joint plates 13 is welded with a cap nut 21B as a joint fitting 21 via a reinforcing plate 25 on the inside as shown in FIGS. It is fixed by. A hollow bolt box 27 opened to the inner peripheral side of the segment 1 is formed inside the joint portion 23 of the other joint plate 13 among the joint plates 13 on both sides in the tunnel circumferential direction. The bolt box 27 is formed as a work space for allowing the fitting 21 to be attached to the joint portion 23 during the joining work with the other segment 1. For this reason, when the cap nut 21B as the joining metal fitting 21 is previously fixed inside the one joint plate 13 as in the present embodiment, the bolt box of the joint plate 13 on the side where the cap nut 21B is provided. By omitting 27, the structure in the vicinity of the joint plate 13 may be simplified.

  The segment 1 further includes a plurality of vertical ribs 31 arranged in the steel shell 10 substantially parallel to the tunnel axis direction, and a plurality of load transmission members 33 arranged in the concrete 41 substantially parallel to the tunnel circumferential direction. ing. Moreover, when the thing adjacent to the joint plate 13 among the vertical ribs 31 arrange | positioned in the steel shell 10 is made into the vertical rib 31A, the segment 1 will be connected between the joint plate 13 and the vertical rib 31A. A member 35 is further provided.

  The vertical ribs 31 are made of a plate material such as a steel plate and are extended in the tunnel axis direction. The plurality of vertical ribs 31 are arranged at intervals in the tunnel circumferential direction. As shown in FIGS. 2 and 3, the longitudinal rib 31 has an outer peripheral end 31 c fixed to the skin plate 15 by welding or the like, and both ends in the tunnel axial direction fixed to the main girder plate 11 by welding or the like. Yes. In the present embodiment, the vertical rib 31 is made of a flat steel plate. However, the cross-sectional shape perpendicular to the tunnel axis direction may be formed in an L shape, a T shape, or the like.

  As shown in FIG. 1, the load transmission member 33 is formed of a steel rod-like member such as a reinforcing bar in the present embodiment, and extends in the tunnel circumferential direction. In the present embodiment, the load transmission member 33 is arranged in a plural number with a gap in the tunnel axis direction and the tunnel radial direction, but the number of the load transmission members 33 is not particularly limited. In addition to this, the load transmission member 33 may be composed of a steel bar-like member such as a deformed steel bar having adhesion, or a steel plate-like member such as a flat steel plate or a flat steel plate with protrusions having adhesion. Good.

  FIG. 7A is a side sectional view showing the relationship between the longitudinal rib 31A of the segment 1 shown in FIG. 1 and one end side 33a of the load transmitting member 33. FIG. As shown in FIG. 7A, the load transmitting member 33 is inserted through the insertion hole 32 formed in the longitudinal rib 31A at one end side 33a thereof, thereby penetrating the longitudinal rib 31A. As a result, the one end side 33 a of the load transmission member 33 is fixed to the vertical rib 31 </ b> A adjacent to the joint plate 13.

  As shown in FIG. 1, one end side 33a of the load transmitting member 33 is fixed to the longitudinal rib 31A adjacent to one joint plate 13 located on the right side in FIG. May be extended toward the other joint plate 13 located on the left side in FIG. In order to improve the strength of the joint portion 23 of the joint plate 13, the load transmission member 33 may be fixed only to one vertical rib 31 </ b> A among the plurality of vertical ribs 31. It does not have to be fixed. In the present embodiment, one load transmitting member 33 is arranged over almost the entire length of the tunnel 1 in the circumferential direction of the tunnel so as to penetrate all the longitudinal ribs 31. In order to improve the strength of 23, the length is not particularly limited. In this case, the load acting on the load transmission member 33 is transmitted to the steel shell 10 and the concrete 41 in the steel shell 10 within a range in which the load transmission member 33 extends.

  As shown in FIGS. 4 and 5, the connecting member 35 is composed of a plate member made of steel in the present embodiment. The connecting member 35 has one end 35a fixed to the joint plate 13 and the other end 35b fixed to the vertical rib 31A. Further, the connecting members 35 are provided across a pair at a predetermined interval in the tunnel axis direction so that the joint portion 23 of the joint plate 13 to which the joint fitting 21 is attached is disposed therebetween. Thereby, for example, when a tensile load acts on the outside of the joint plate 13, the load is reliably transmitted from the joint plate 13 to the vertical rib 31 </ b> A via the connecting member 35.

  In this embodiment, the connecting member 35 is fixed to the joint plate 13 via the reinforcing plate 25 fixed to the joint plate 13, but is directly fixed to the joint plate 13 without using the reinforcing plate 25. Of course.

  When joining the segments 1 adjacent to each other in the tunnel circumferential direction, as shown in FIG. 5, an operator or the like arranges the bolt 21 </ b> A in the bolt box 27, and then the bolt 21 </ b> A is connected to the joint plate 13 and the reinforcing plate 25. These segments 1 are joined to each other by inserting the bolt 21A into the bolt hole 14 and screwing it into the cap nut 21B.

  In addition, as the joining metal fitting 21 for joining the segments 1 adjacent to each other in the tunnel circumferential direction, a mechanical joint including a male joint and a female joint may be used in addition to the bolt 21A and the nut 21B. In this case, since it is not necessary to attach the joint fitting 21 like the bolt 21 </ b> A during the joining operation of the segment 1, when the concrete 41 is filled in the steel shell 10, the bolt box is provided near the joint portion 23 of the joint plate 13. 27 may not be formed.

  Further, when a bolt hole is provided in the main beam plate 11 for joining the segments 1 adjacent to each other in the tunnel axis direction, the bolt box 27 is also formed in the vicinity of the main beam plate 11.

  The concrete 41 in the steel shell 10 is pre-filled at a factory or the like with respect to the portion excluding the bolt box 27. The bolt box 27 is filled with a time-hardening filler such as concrete or non-shrink mortar by on-site construction after the joining operation of the segment 1 is completed. The time-curable filler filled in the bolt box 27 is not filled in order to improve the strength of the joint portion 23 of the joint plate 13, such as the joint fitting 21 exposed in the bolt box 27. Since it is filled for the purpose of preventing corrosion of the steel material or smoothing the inner peripheral surface of the segment 1, its strength and quality are not particularly limited. If there is no need to prevent corrosion, etc., the joining process of the segment 1 is completed as it is without filling the bolt box 27 with the time-curable filler, and the work process is simplified. Also good. In addition, instead of filling the bolt box 27 with the time-curable filler, a plate material or the like may be attached to the opening of the bolt box 27 and the bolt box 27 may be covered.

  The effect of the segment 1 according to the present invention configured as described above will be described.

  In the segment 1 according to the present invention, the joint plate 13 and the longitudinal rib 31A adjacent to the joint plate 13 are fixed by the connecting member 35, and the one end side 33a of the load transmitting member 33 is fixed to the longitudinal rib 31A. Therefore, when a tensile load or a bending moment acts on the joint plate 13 of the segment 1 toward the outside of the joint plate 13, the tensile load or the like is transmitted to the vertical rib 31 </ b> A and the load transmission member via the connecting member 35. 33 can be reliably transmitted to the terminal 33. This makes it possible to distribute the tensile load and the like acting on the joint plate 13 with a portion of the concrete 41 and the steel shell 10 within the range covered by the longitudinal rib 31A and the load transmission member 33. As a result, The strength of the joint portion 23 of the segment 1 can be improved.

  In particular, in the segment 1 according to the present invention, the load transmission mechanism between the joint plate 13 and the load transmission member 33 is formed by a structure that does not depend on the adhesion of the concrete 41. The load transmission mechanism is established regardless of the strength and quality of 41. In addition, the segment 1 according to the present invention has only a portion 27 in the bolt box that needs to be filled with a time-curable filler such as concrete and non-shrink mortar at the time of on-site construction. There is no need to control the strength and quality of the time-curable filler to be filled. For this reason, the segment 1 according to the present invention can realize a structure with high structural reliability that is independent of the strength and quality of the concrete with an inexpensive and simple configuration in order to exert the desired strength at the joint portion 23. It is possible.

  In addition, the segment 1 according to the present invention has such a structure with high structural reliability, without specially processing the vertical rib 31 or using a special member. It can be realized.

  In addition, as shown to Fig.7 (a), in the case of embodiment which the longitudinal end 31A has penetrated the one end side 33a of the load transmission member 33, load transmission between the joint board 13 and the load transmission member 33 is made into concrete. In order to obtain a structure that does not depend on the adhesion of 41, the following structure is preferable.

When a load is applied to the longitudinal rib 31A in the direction P of FIG. 7A, the joint plate is distributed and spreads in the concrete 41 from the side surface 31a of the longitudinal rib 31A located on the side facing the joint plate 13. A support pressure acts toward the side 13, and the protrusion 34 of the load transmission member 33 protruding from the longitudinal rib 31A is firmly restrained by this support pressure. In this case, as the protruding length of the protruding portion 34 from the vertical rib 31A increases, the restraining force of the protruding portion 34 due to the support pressure from the vertical rib 31A increases. For this reason, in the case of this embodiment, in order to make the load transmission between the joint plate 13 and the load transmission member 33 a structure that does not depend on the adhesion of the concrete 41,
The longer the protrusion length of the protrusion 34 from the vertical rib 31A, the better.

  Next, another configuration of the segment 1 according to the present invention will be described in more detail.

  FIG. 7B and FIG. 7C are side cross-sectional views of segments shown for another embodiment of the load transmission member 33. In the above-described embodiment, as a means for fixing the load transmission member 33 to the vertical rib 31A, as shown in FIG. 7A, the load transmission member 33 is placed in the insertion hole 32 formed in the vertical rib 31A. The means for penetrating has been described as an example. As another means for fixing the load transmitting member 33 to the vertical rib 31A, for example, as shown in FIG. 7B, the end 33a of the load transmitting member 33 is brought into contact with the side surface of the vertical rib 31A. In addition, a means for fixing the end 33a of the load transmitting member 33 to the vertical rib 31A by welding may be employed. In addition to this, as shown in FIG. 7C, the load transmitting member 33 is arranged on the inner peripheral side of the vertical rib 31A and then brought into contact with each other to thereby end the inner peripheral end of the vertical rib 31A. A means for fixing the load transmission member 33 to the 31b by welding may be employed.

  In addition, although not shown, a male screw portion is provided at one end portion 33a of the load transmitting member 33 penetrating the longitudinal rib 31A in a manner as shown in FIG. A means for bolting the load transmitting member 33 and the longitudinal rib 31A may be employed by screwing the nut into the nut. In addition, other means such as drill screws, scissors, and adhesion may be employed. For example, in the form as shown in FIG. 7C, the cross-sectional shape orthogonal to the tunnel axis direction is L-shaped. Alternatively, a means for joining and fixing these overlapped portions with a drill screw or the like using vertical ribs 31 such as a T-shape and a load transmission member 33 made of a plate-like member may be employed.

  Here, as shown in FIG. 7A, when the load transmitting member 33 has a protruding portion 34 formed through the vertical rib 31A and protruding from the vertical rib 31A, the vertical rib 31A extends in the tunnel circumferential direction. When trying to deform, the protrusion 34 was surrounded by the joint plate 13 and the longitudinal rib 31A adjacent to the joint plate 13 and the main girder plate 11 between the ends of the joint plate 13 and the longitudinal rib 31A. In FIG. 1 and FIG. 7A, it functions as a detent for restraining the movement of the concrete 41 filled in the space S1 in the range indicated by the alternate long and short dash line. For this reason, the joint plate 13, the vertical rib 31A adjacent to the joint plate 13, the main girder plate 11, and the concrete 41 filled in the space S1 surrounded by these will behave as a composite beam. Thus, the strength and rigidity of the circumferential end of the segment 1 including the joint 23 and the joint 23 are improved.

  FIG. 8A and FIG. 8B are side cross-sectional views of segments shown for other embodiments of the connecting member 35. In the above-described embodiment, the connecting member 35 has been described with respect to the example of the plate member made of steel. In this case, as shown in FIG. 8A, the outer peripheral side end portion 35c of the connecting member 35 is provided. May be fixed to the skin plate 15 by welding or the like. In this case, the tensile load transmitted from the joint plate 13 to the connecting member 35 is directly transmitted to the skin plate 15, and as a result, the strength of the joint portion 23 of the segment 1 can be further improved.

  Further, the connecting member 35 is not particularly limited as to its specific configuration as long as both ends thereof are fixed to the joint plate 13 and the vertical rib 31A. As shown in FIG. You may be comprised from the rod-shaped member. Moreover, the connection member 35 may be comprised from steel plate-shaped members like the flat steel plate with a protrusion which has adhesive force, and steel rod-shaped members like a deformed steel bar.

FIG. 9 is a partial cross-sectional bottom view showing another embodiment of the segment 1 with a part of the concrete omitted. When the joint portion 23 of the segment 1 is provided in the vicinity of both ends of the segment 1 in the tunnel axis direction, the joint portion 23 is arranged between the main girder plate 11 instead of providing a pair of connecting members 35 per one joint portion 23. As described above, one connecting member 35 may be provided at a predetermined interval from the main beam plate 11, and one of the connecting members 35 may be substituted by the main beam plate 11. Accordingly, it is not necessary to provide an extra connecting member 35, and the cost of the segment 1 can be reduced accordingly.

  Incidentally, the segment 1 which concerns on this invention is not limited to embodiment mentioned above, The design change may be suitably carried out in the range which does not deviate from the summary of this invention. For this reason, for example, a plurality of reinforcing bars extending in the tunnel axial direction and the tunnel circumferential direction may be arranged in the concrete 41 of the segment 1 in a lattice shape, and the holes for injecting the erector and backing material may be provided. It is good also as providing the tubular body which has in the center part of the segment 1. FIG.

DESCRIPTION OF SYMBOLS 1 Concrete filled steel segment 10 Steel shell 11 Main girder plate 13 Joint plate 14 Bolt hole 15 Skin plate 21 Joint metal 21A Bolt 21B Cap nut 23 Joint part 25 Reinforcement plate 27 Bolt box 31 (31A) Vertical rib 32 Insertion hole 33 Load transmitting member 34 Protruding portion 35 Connecting member 41 Concrete

Claims (4)

In a concrete-filled steel segment constructed by filling concrete into a steel shell composed of a pair of main girders and a pair of joint plates and a skin plate,
A plurality of vertical ribs arranged substantially parallel to the tunnel axis direction in the steel shell,
A load transmission member disposed substantially parallel to the circumferential direction of the tunnel in the concrete and having one end fixed to a vertical rib adjacent to the joint plate;
A connection member fixed at one end to the joint plate and the other end to a vertical rib adjacent to the joint plate ;
A concrete-filled steel segment , wherein the load transmitting member is provided with a protrusion by passing through a vertical rib adjacent to the joint plate and fixed to the vertical rib . 2. The connecting member is made of a steel plate-like member, and is fixed to the joint plate through a reinforcing plate fixed to the joint plate in a state of being separated from the skin plate. Concrete filled steel segment as described. The joint plate has a joint portion to which a joint fitting for joining each other and other concrete-filled steel segments adjacent in the circumferential direction of the tunnel is attached,
The concrete filled in the steel shell is the other concrete in the space surrounded by the joint plate, the vertical rib, and the main girder plate between the ends of the joint plate and the vertical rib. The concrete according to claim 1 or 2, wherein a portion excluding a bolt box formed as a work space for attaching a joint fitting to the joint portion at the time of joining work with a packed steel segment is filled in advance. Filled steel segment. The joint plate has a joint portion to which a joint fitting for joining each other and other concrete-filled steel segments adjacent in the circumferential direction of the tunnel is attached,
The connecting member is provided across a pair with a predetermined interval so that the joint portion is disposed between the connecting members,
Concrete filled in the above steel shell, any one of claims 1 to 3, characterized in that the cap nut as joining fitting to the inside of the joint plate is formed by pre-filled in advance fixed site Concrete filled steel segment as described .

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