JP4834028B2 - Synthetic segment - Google Patents

Description

  The present invention relates to a segment of a shield tunnel, and more particularly to a structure of a composite segment for a tunnel in which a tensile force acts on a ring-to-ring joint of a segment such as a tunnel in soft ground, a tunnel in which internal water pressure acts, a deformed section tunnel, etc. The present invention relates to a high-strength, high-rigidity composite segment that can efficiently transmit the tensile force acting on the joint to the steel shell or the filled concrete part.

  In segments used for tunnels in soft ground, tunnels with internal water pressure, and irregular cross-section tunnels, large bending moments and tensile forces act on segment joints. Therefore, it is necessary to efficiently transmit the tensile force acting on the segment joint material such as a bolt or a mechanical joint to the steel shell or the filled concrete part.

  Examples of the bending moment include a bending moment caused by earth pressure or water pressure from the natural ground side. The tensile force includes, for example, a tensile force due to internal water pressure in a cross section perpendicular to the tunnel axis direction.

  Moreover, in order to ensure water-stopping against external forces such as soil water pressure and to suppress tunnel deformation, the segment joint is required to have high rigidity (rotational rigidity or tensile rigidity). Furthermore, the segment joint is required to have a high strength capable of withstanding a cross-sectional force generated by an external force.

There are a synthetic segment and a segment joint used therefor as a segment used in the above-described applications.
For example, as one form of the synthetic segment, as shown in FIG. 12 (a), a steel shell 5 including a pair of main girders 2 and a pair of joint plates 3, and a skin plate 4, and a joint in the steel five shells. A circumferential steel bar having a bolt box 7 for a segment joint in a segment steel shell 16 composed of vertical ribs 6 formed in parallel with the plate and arranged in parallel with the main girder 2 in the tunnel circumferential direction 11 and a synthetic segment 15 in which the circumferential reinforcing bar 11 and the steel shell 5 are integrated are known by filling concrete 9 provided in the steel shell segment so as to embed the circumferential reinforcing bar 11 and the circumferential reinforcing bar.
In the synthetic segment 15, a steel shell (five-surface steel shell) 5 is formed by five surfaces of the pair of main girders 2 and the pair of joint plates 3 and the skin plate 4. 5 is a composite segment 15 that includes a five-sided steel shell segment 16, and is composed of the five-sided steel shell segment 16, a circumferential reinforcing bar 11, and filled concrete 9.
Moreover, as a structure in the vicinity of the high strength and high rigidity joint portion used for such a synthetic segment 15, it is necessary to distribute and transmit the tensile force generated in the joint material to the reinforcing bar 11 and the steel shell 5 in the circumferential direction. is there.
Unless the structure is such that the tensile force generated in the joint material is distributed and transmitted to the reinforcing bars 11 and the steel shell 5 in the circumferential direction as described above, a structure in which concrete is simply filled with concrete in a steel segment. Or, it is a segment with a steel frame attached to a reinforced concrete segment.

As one form of the structure in the vicinity of the high-strength / high-rigidity joint portion, as shown in FIG. 12, concrete is filled in a five-sided steel shell segment 16, and a circumferential reinforcing bar 11 is arranged inside the steel shell 5. There is a composite segment 15 in which a joint metal 19 including a reinforcing plate 17 and a fixing reinforcing bar 18 is installed on the joint plate 3 as a joint. The action of each part of the structure of the joint hardware 19 is as follows, and the tensile force acting on the joint material (bolt or mechanical joint) which is the tensile material of the segment joint is transmitted to the steel shell and the circumferential reinforcing bar. Therefore, it is possible to obtain a joint having high strength and high rigidity.
The action of the reinforcing plate 17 enhances the rigidity of the joint by the rigidity of the reinforcing plate 17. Further, the fixing reinforcing bar 18 transmits the tensile force of the joint to the circumferential reinforcing bar 11 (with a lap joint of the reinforcing bars) through the reinforcing plate 17. Further, by welding the reinforcing plate 17 and the joint plate 3, a tensile force acting on a joint material (connecting rod) such as a bolt is transmitted to the steel shell.

  Although not shown in the drawings, as another form of reinforcing the joint plate of the composite segment in which the five-sided steel shell segment as described above is filled with concrete and the circumferential reinforcing bars are arranged inside the steel shell, Inside, a space-defining member is provided on the joint plate, a connecting member made of reinforcing steel is connected to the space-defining member, and the connecting member is embedded in the concrete so that the tensile force generated in the joint material can be reduced. A configuration is also known in which a composite segment having a joint having high strength and high rigidity is transmitted to the reinforcing bars in the direction (see, for example, Patent Document 1).

There is also known a form in which concrete is filled in a five-sided steel shell segment and a joint plate of a composite segment is reinforced by a reinforcing plate provided with a side plate (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 9-228793 JP 2005-76317 A

In the case of using the joint hardware as shown in FIG. 12, the tensile force acting on the joint material can be transmitted to the reinforcing bars in the circumferential direction by adhesion through the filling concrete, but the bending rigidity of the main girder is small. For this reason, the main girder has a problem that the tensile force cannot be transmitted sufficiently. In addition, there is a problem that the number of processing steps for the joint hardware itself is large and expensive.
Further, in the case of a combination of the space defining member and the fixing reinforcing bar fixed to the space reinforcing member, when the force is transmitted to the circumferential reinforcing bar inside the segment, the force is transmitted to the fixing reinforcing member joined to the space defining member. Although it is possible, if more circumferential bars are needed, force cannot be transmitted to the circumferential bars. In such a structure, the force is transmitted to the main girder from the joint plate. However, since the bending rigidity of the joint plate is small, sufficient force cannot be transmitted unless the joint plate is reinforced. As a result, there is a problem that sufficient joint strength and rigidity cannot be secured for a large bending moment and tensile force. Further, since the fixing reinforcing bar is welded after bending the space defining member, there is a problem that the degree of processing is high and the manufacturing cost is high, such as deformation due to welding distortion and the need for a correction process.
Moreover, in the form which reinforces the said joint plate, force can be transmitted to the internal circumferential reinforcement (when the circumferential reinforcement is arrange | positioned) the tension | tensile_strength of joint materials, such as a volt | bolt. However, since the bending rigidity of the joint plate is small, sufficient force cannot be transmitted to the steel shell. Furthermore, even when the reinforcing bars in the circumferential direction are arranged, there is a problem in that the reinforcing member (reinforcing plate) is fixed by welding or the vertical ribs to be drilled are highly processed, and the manufacturing cost of the synthetic segment becomes high. .
That is, as a problem common to any of the above forms, the tensile force acting on the joint material can be transmitted to either the steel shell or the circumferential reinforcing bar embedded in the filled concrete, but the balance is balanced between both. Since it cannot be transmitted well, the strain in the segment width direction is not uniform and the strain or stress of either the main girder or the circumferential reinforcing bar becomes large. Since the stress becomes non-uniform in the width direction, the cross section of the segment body cannot be used efficiently and not only the rigidity and strength of the joint decreases, but also due to the stress distribution in the width direction of the segment. However, there is a problem that the characteristics such as the high strength and high rigidity of the segment main body, which are the characteristics of the composite segment, cannot be fully exhibited.
Both tensile force acting on joint members (bolts and connecting materials of mechanical joints) against large bending moments and tensile forces due to earth water pressure or internal water pressure, both in steel shells and circumferential reinforcing bars embedded in filled concrete Therefore, there is a demand for a composite segment that can transmit in a well-balanced manner and can transmit with high rigidity and high strength, and has higher rigidity, high strength, and low cost.

  In the present invention, the segment joint is a bolt type, which has a bolt box for the segment joint, and is intended for a composite segment composed of a steel shell covering the outer surface of the segment, concrete, and a circumferential reinforcing bar. And, in the synthetic segment having the bolt box as described above, the strength of the bolt box can be increased even if the concrete is filled between the joint plate and the first vertical rib adjacent to the joint plate to form the filling concrete. Therefore, there is a feature that it is not possible to form a strong concrete compression diagonal material in the filling concrete that is in contact therewith.

The synthetic segment includes a skin plate formed on the ground side of the segment, a main girder formed in the tunnel circumferential direction on the outer periphery of the segment and a joint plate formed in the tunnel axial direction, and a joint plate in the segment. A composite segment of a so-called five-sided steel shell consisting of circumferential reinforcing bars and filled concrete arranged in parallel to the main girder in the circumferential direction of the tunnel, inside the steel shell segment composed of longitudinal ribs formed in parallel. It is targeted.
In the present invention, as described above, the tensile force acting on the joint member (the connecting material of the bolt and the mechanical joint) with respect to the large bending moment and tensile force is the circumferential reinforcing bar embedded in the main girder and the filling concrete. The purpose is to provide high-rigidity, high-strength and inexpensive composite segments by transmitting to both of them in a balanced manner and with high rigidity and high strength.

In order to solve the above-mentioned problem advantageously, the composite segment of the first invention comprises a plurality of main girders and a pair of joint plates, a skin plate, and vertical ribs formed in the segment in parallel with the joint plates. The steel shell segment has a bolt box for the segment joint inside the formed steel shell segment, and is provided in the steel shell segment so as to embed the circumferential reinforcing bar arranged in parallel with the main girder in the circumferential direction of the tunnel and the reinforcing bar in the circumferential direction. In the synthetic segment in which the circumferential reinforcing bar and the steel shell are integrated by the filled concrete to be
The bolt box is arranged close to the main girder, and the reinforcing material is arranged close to the bolt box in parallel to the main girder with the bolt box interposed therebetween, and the reinforcing material is disposed at least from the joint plate to the joint plate. From the first vertical rib adjacent to the n-th vertical rib (n is 2 or more), and the joint plate with which the reinforcing material comes into contact and the contact portion with the vertical rib are connected to the joint plate and the vertical rib. The circumferential reinforcing bar is provided so as to extend to a position closer to the joint plate than the nth vertical rib.
In the second invention, a bolt for a segment joint is provided inside a steel shell segment composed of a plurality of main girders and a pair of joint plates, a skin plate, and a vertical rib formed in the segment in parallel with the joint plate. A circumferential reinforcing bar disposed in parallel to the main girder in the circumferential direction of the tunnel and a filling concrete provided in the steel shell segment so as to embed the circumferential reinforcing bar; Are installed in parallel with the main beam from the joint plate to at least the first longitudinal rib adjacent to the joint plate, and the joint plate and the longitudinal rib of the reinforcement member The abutting portion is fixed, and a horizontal reinforcing plate is disposed substantially parallel to the skin plate between the first vertical rib adjacent to the joint plate, the main girder, and the reinforcing member, and the horizontal reinforcing plate is at least Characterized by welded to serial main beam and the reinforcing member.

According to the first aspect of the present invention, a segment joint joint is formed inside a steel shell segment composed of a plurality of main girders and a pair of joint plates, a skin plate, and vertical ribs formed in the segments in parallel with the joint plates. The circumferential reinforcing bars and steel are provided by a circumferential reinforcing bar disposed in parallel to the main girder in the circumferential direction of the tunnel and a filling concrete provided in a steel shell segment so as to embed the circumferential reinforcing bars. In the synthetic segment where the shell is integrated,
The bolt box is arranged close to the main girder, and a reinforcing material is arranged in parallel to the main girder with the bolt box sandwiched therebetween, and the reinforcing material is arranged close to the bolt box, and at least the joint plate from the joint plate Are installed from the first vertical rib adjacent to the nth (n is 2 or more) vertical ribs, and the joint plate and the vertical rib contact portion with which the reinforcing material contacts are the joint plate and the vertical rib. Since the circumferential reinforcing bars are provided so as to extend to a position closer to the joint plate than the n-th vertical rib, a large bending moment or The tensile force acting on the joint member (connecting material consisting of bolts) against the tensile force can be transmitted in a well-balanced manner to both the main girder and the circumferential reinforcing bar embedded in the filled concrete. High rigidity -A high-strength, inexpensive synthetic segment can be realized with simple processing.
According to the second aspect of the present invention, a segment joint joint is formed inside a steel shell segment composed of a plurality of main girders and a pair of joint plates, a skin plate, and a vertical rib formed in the segment in parallel with the joint plate. The circumferential reinforcing bars and steel are provided by a circumferential reinforcing bar disposed in parallel to the main girder in the circumferential direction of the tunnel and a filling concrete provided in a steel shell segment so as to embed the circumferential reinforcing bars. In the synthetic segment in which the shell is integrated, the reinforcing material is installed in parallel with the main girder from the joint plate to at least the first vertical rib adjacent to the joint plate, And a lateral reinforcing plate is disposed substantially parallel to the skin plate between the first vertical rib adjacent to the joint plate, the main girder, and the reinforcing member. Small board Since at least the main girder and the reinforcing member are fixed to each other by welding, when a tensile force acts on a bolt or a joint that joins adjacent segments in the circumferential direction of the tunnel, it can be transmitted from the lateral reinforcing plate to the main girder. it can.

  Next, the present invention will be described in detail based on the illustrated embodiment.

1 to 4 show a synthetic segment 1 according to the first embodiment of the present invention. In the first embodiment, the bolt box 7 is provided on the inner side of the joint plate 3, so that the concrete compression diagonal material is not easily formed. Therefore, the reinforcing member 8 is connected to the joint plate 3 from the joint plate 3. The first vertical rib 6a is extended to the second vertical rib 6b, and a concrete compression diagonal is formed between the first vertical rib 6a and the second vertical rib 6b. It is a form.
FIG. 1 shows a composite segment according to the first embodiment of the present invention, and is a bottom view as seen from the inner side of the tunnel with a part of the filling concrete being removed. FIG. 2 is an explanatory diagram for explaining a stress transmission path of the composite segment shown in FIG. 1. FIG. 3A is an explanatory view for explaining that a concrete compression diagonal is formed by omitting a part of FIG. 2, and FIG. 3B is a longitudinal front view of the composite segment shown in FIG. . FIG. 4 is a longitudinal front view of the synthetic segment shown in FIG. 1 cut at the bolt box portion.

  A pair of main girders 2 (in the illustrated case, outer main girders 2a) are arranged so as to extend in the tunnel circumferential direction while being spaced in parallel in the tunnel axis direction, and the main girders 2 (2a) The joint plate 3 is arranged over one end and the other end in the circumferential direction of the tunnel and fixed by welding, and the skin plate 4 is welded to each main girder 2 (2a) and each joint plate 3. A steel shell 5 is formed by being fixed. The welding of the main girder 2 (2a) and the joint plate 3 is full penetration welding.

  In the steel shell 5, a plurality of (four in the case of illustration) longitudinal ribs 6 are arranged in parallel in the tunnel circumferential direction so as to extend in the tunnel axis direction over the main beam 2 (2a). ing. The base end of the vertical rib 6 on the ground side in the tunnel radial direction is fixed to the skin plate 4 by welding. Further, the end of the longitudinal rib 6 in the tunnel axis direction is fixed to the main beam 2 (2a) by welding.

Inside the corners of the four corners of the main girder 2 (2a) and the joint plate 3, bolt boxes 7 formed by boxing and opened on the inner side of the tunnel are close to the main girder 2 respectively. Is provided.
When tensile force in the tunnel circumferential direction acts on the joint material (bolt) of the segment joint of this form, the joint A between the first vertical rib 6a adjacent to the joint plate 3 and the reinforcing material 8, the joint plate 3 and the main plate In the diagonal direction connecting the joint B with the beam 2 (2a), the area of the concrete compression diagonal material by the filling concrete 9 is difficult to be formed, and the second vertical rib 6b adjacent to the first vertical rib 6a. A region of the concrete compression diagonal member 10 is formed in a diagonal direction connecting the joint C between the reinforcing member 8 and the joint D between the first longitudinal rib 6a and the main girder 2.
By arranging the bolt box 7 close to the main girder 2 (2a), the reinforcing material 8 described later is arranged at a position close to the main girder 2 (2a), and concrete compression is applied to the filling concrete 9. When forming the region of the diagonal member 10, the inclination angle α of the concrete compressed diagonal member 10 with respect to the main beam 2 is reduced, which is important in efficiently transmitting the tensile force to the main beam 2 (2 a). is there. The further away the reinforcing member 8 is from the main beam 2 (2a), the larger the inclination angle α of the concrete compression diagonal member 10 is, and the main beam 2 (2a), the reinforcing member 8, the first vertical rib 6a and the second The shear deformation of the concrete surrounded by the vertical ribs 6b increases, and the bending deformation of the joint plate 3 between the main beam 2 (2a) and the reinforcing member 8 increases, and the rigidity of the segment joint decreases. End up.

  A rod-shaped reinforcing material 8 having a length shorter than that of the main girder 2 (2a) is disposed on the opposite side of the main girder 2 (2a) so as to be close to the bolt box 7. They are arranged so as to extend almost symmetrically in the circumferential direction of the tunnel. As the reinforcing material 8, a steel material is used.

The reinforcing member 8 is inserted into the first vertical rib 6a adjacent to the joint plate 3 and extended to the second vertical rib 6b adjacent to the first vertical rib 6a. The sides are abutted and fixed by welding. The reinforcing member 8 is arranged in parallel with the main beam 2 (2a), and the other end is in contact with the inner side of the joint plate 3 and fixed by welding.
The reinforcing material 8 and the first vertical rib 6a are fixed by welding at the contact portion.

The reason why the reinforcing material 8 is extended to the second vertical rib 6b in this form is as follows.
In this embodiment, a reinforcing material 8 is disposed near the main beam 2 (2a) between the joint plate 3 and the first vertical rib 6a, and the main beam 2 (2a), the coupling plate 3, the reinforcing material 8 and Even if concrete is placed in a portion surrounded by the first vertical rib 6 a and the skin plate 4, the joint A between the first vertical rib 6 a and the reinforcing material 8, the joint plate 3, and the main girder 2 Since it is not possible to form a concrete compression diagonal material with the filled concrete 9 in the diagonal direction connecting the joint B, the tensile force acting on the joint material of the segment joint such as a bolt can be efficiently increased. (2a) cannot be transmitted.

More specifically, when the segments adjacent to each other in the tunnel circumferential direction are joined by fastening bolts and nuts, the joint plate 3 is joined when a force is applied to peel the joint plate 3 in the tunnel circumferential direction. A tensile force T (see FIG. 2) in the circumferential direction of the tunnel acts on the reinforcing member 8 that is transmitted to the first vertical rib 6a.
And when the filling concrete 9 is restrained by the main beam 2 (2a), the joint plate 3, the reinforcing material 8, and the first vertical rib 6a, a strong concrete compression diagonal can be formed, Although it is possible to form a truss mechanism with the concrete compression diagonal, the first longitudinal rib 6a and the main girder 1, or with the concrete compression diagonal, the joint plate 3, and the reinforcing material 8, the space of the bolt box 7 can be formed. Because the part is large, it is not possible to form a concrete compression diagonal with concrete. Further, the bolt box 7 is a space for forming a work space in which the bolts and nuts are manually arranged, and therefore, the filled concrete 9 cannot be reliably restrained.

  Since the bolt box 7 is arranged between the joint plate 3 and the first vertical rib 6a to form a space portion, concrete is placed around the space portion to fill the concrete 9 However, the concrete compression diagonal material expected in the present invention cannot be formed.

Therefore, in this embodiment, the reinforcing member 8 is arranged so as to extend to the second vertical rib 6b, and the main beam 2 (2a), the first vertical rib 6a, the reinforcing member 8, and the second vertical rib 6b. The inside-filled concrete 9 surrounded by is restrained. In this way, as described above, when a tensile force in the tunnel circumferential direction acts on the joint portion between the bolted segments, the intersection C between the second vertical rib 6b and the reinforcing material 8, A concrete compression diagonal material 10 made of filled concrete 9 is formed in the diagonal region (b) connecting the beam 2 (2a) and the intersecting portion D of the first vertical rib 6a to resist it. As a force, a tensile force is transmitted to the main beam 2 (2a).
A truss mechanism is formed by the second vertical rib 6b, the main beam 2 (2a), and the concrete compression diagonal member 10, and the truss is formed by the concrete compression diagonal member 10, the first vertical rib 6a, and the reinforcing member 8. A mechanism is formed, and a strong concrete compression diagonal member 10 is obtained.
And in this invention, the concrete compression diagonal material 10 by the filling concrete 9 is formed by the filling concrete 9 which is directly contacting the main girder 2 (2a), and also the concrete compression diagonal material in the main girder 2 (2a) 10 is formed close to each other, and the crossing angle (inclination angle α) of the concrete compression diagonal material 10 with respect to the main girder 2 (2a) is small. The tensile force t can be efficiently transmitted to (2a). That is, the tensile force acting on the reinforcing member 8 is converted into a compressive force on the concrete compression diagonal material 10 so that the tensile force acts on the main beam 2 (2a).
Further, the reinforcing material 8 is connected to the first vertical rib 6a and the second vertical rib 6b, and spans the reinforcing material 8, the first vertical rib 6a, and the second vertical rib 6b in the tunnel circumferential direction. Tensile stress is transmitted from the second vertical rib 6b to the circumferential reinforcing bar 11 arranged so as to be embedded in the filling concrete 9 through adhesion of concrete.
The length in which the circumferential reinforcing bar 11 is provided will be described. In order to transmit a tensile stress from the vertical rib to the circumferential reinforcing bar 11 through the filling concrete 9, the circumferential reinforcing bar is connected to the circumferential reinforcing bar 11. It is provided so as to extend to a position closer to the joint plate 3 than the two vertical ribs 6b. It is not always necessary that the circumferential reinforcing bars 11 extend to the joint plate 3, and it is sufficient that the adhesion length with the concrete for transmitting the tensile stress is taken. And in this 1st Embodiment, although the reinforcing bar 11 of the circumferential direction is arrange | positioned so that it may extend between the 1st vertical rib 6a and the coupling board 3, the 2nd vertical rib 6b and the 1st vertical rib 6a are arrange | positioned. Between them, the reinforcing bars 11 in the circumferential direction may be arranged so as to extend to a position closer to the joint plate 3 side.

In order to efficiently transmit the tensile force in the circumferential direction of the tunnel to the main girder 2 (2a) by the compression resistance action of the concrete compression diagonal member 10 as described above, the gap between the main girder 2 (2a) and the reinforcing material 8 is further increased. In order to reduce the bending deformation of the joint plate 3 and increase the rigidity of the joint, as shown in FIG. 3 (a), the angle formed by the diagonal line 12 of the diagonal area A and the main girder 2, that is, The inclination angle α of the concrete compression diagonal member 10 with respect to the main girder 2 is smaller, the bending deformation of the joint plate 3 becomes smaller, so that the joint rigidity can be increased. Further, since the shear deformation of the concrete 9 is reduced, the tensile force of the reinforcing material can be transmitted to the main girder 2 (2a) with high rigidity, so that the tensile force can be efficiently transmitted to the main girder 2 (2a).
The inclination angle α is preferably as small as possible in terms of structure, but the angle is determined by design. That is, the bolt box 7 has a size for fitting a bolt, a hand and a bolt for fastening the bolt, that is, usually 15 to 20 cm square or less, and the installation position and dimensions of the vertical ribs of the segment are determined by the seismic design. Usually, they are arranged at a pitch of about 30 cm or more. Although it is preferable that the minimum dimension is determined by the above design, generally, when the inclination angle α is smaller than 25 °, the bolt box 7 is placed between the main beam 2 (2a) and the reinforcing member 8. It becomes difficult to arrange, and at 35 ° or more, the inclination angle α becomes too large, the component force transmitted from the concrete compression diagonal 10 to the main girder 2 becomes relatively small, and shear deformation of the concrete 9 occurs. In the path through which the tensile force of the joint material is transmitted from the reinforcing material 8 to the main girder 2 (2a), the rigidity is lowered and cannot be efficiently shared.
Further, in the segment, the circumferential reinforcing bar 11 embedded by the filling concrete 9 extends at least between the second longitudinal ribs 6b and between the vicinity of the joint plate 3 so as to extend in the tunnel circumferential direction. Are arranged in parallel with a distance in the tunnel axis direction.
Therefore, the tensile force acting on the reinforcing member 8 is transmitted to the filling concrete 9 via the vertical ribs 6 (at least the second vertical ribs 6b), and from the filling concrete 9 via the circumferential reinforcing bars 11. Then, it can be transmitted to the adjacent segment via the filling concrete 9 and the vertical rib 6 on the other end side, the reinforcing material and the joint plate.

  In this embodiment, the reinforcing material 8 is a reinforcing material 8 made of a rod-shaped steel material such as a different diameter reinforcing bar. As will be described later, the reinforcing material 8 can have an appropriate form such as a steel bar or a steel material. is there.

  In the above-described embodiment, the case of a pair of outer main girders 2a has been shown. However, as another embodiment, the case of having the middle main girder 2b as the main girder 2 is shown in FIG. In this case, in addition to the above embodiment, the middle main girder 2b is provided in the center in the width direction of the segment 1 in parallel with the outer main girder 2a, and the bolt boxes 7 are provided in close proximity to the left and right of the middle main girder 2b. Is provided across the bolt box 7 from the joint plate 3 to the second vertical rib 6b in a position symmetrical to the middle main girder 2b, and the joint plate of the reinforcing member 8 and the vertical rib 6 (6a, The contact part with 6b) is fixed by welding, for example. Moreover, the point by which the concrete 9 is filled inside the steel shell is the same as the said embodiment. Since the function and effect are the same as those of the outer main beam 2a of the above-described embodiment, the description thereof is omitted. In this embodiment, an example of three main digits as the plurality of main digits 2 (2a, 2b) is shown, but the same configuration is provided even when the number of the main digits 2 (2a, 2b) is four or more. Of course, the same effect can be exhibited.

  Furthermore, as a modified form of the above embodiment, the cross-sectional form of the vertical rib 6 may be a plate-like vertical rib 6 as shown in FIGS. 3 and 4, but as shown in FIG. Or a vertical rib 6 having a T-shaped cross section as shown in FIG.

Further, in place of the rod-shaped reinforcing member 8 in the above embodiment, as shown in FIG. 7, a notch groove 13 is provided in the first vertical rib 6 so that the plate-shaped reinforcing member 8 is replaced by the first vertical rib 6. The intersecting portion may be fixed by welding by being inserted into the notch groove 13. Although not shown in the drawings, as another form, the portions intersecting with the first vertical rib 6a adjacent to the joint plate 3 are notched in the height direction (tunnel radial direction) in half (noted above). A groove having a half depth of the notch groove 13) may be provided and fitted so that the intersecting portion is fixed by welding.
Although illustration is omitted, independent reinforcing materials are arranged in series between the joint plate 3 and the first vertical rib 6a, and between the first vertical rib 6a and the second vertical rib 6b. Further, it may be fixed to the joint plate 3 and the first vertical rib 6a and to the first vertical rib 6a and the second vertical rib 6b by welding. In such a form, the plate | board thickness part of the 1st vertical rib 6a becomes a form which connects the independent reinforcement materials arrange | positioned in series.

In the first embodiment, in the width direction of the composite segment 1, the joint plate 3, the first vertical rib 6 a, the main girder 2 (2 a) between them, the reinforcing members 8, and the reinforcement members 8 are surrounded by them. The first composite beam 20 in which the end portion side in the segment width direction is reinforced by the reinforcing members 8 is formed by the filling concrete 9 filled in the region. Further, the second vertical rib 6b, the first vertical rib 6a, the main girder 2 between them, the reinforcing material 8 and the filling concrete 9 filled in the region surrounded by the segment width, A second composite beam 21 in which the direction end portion is reinforced by each reinforcing member 8 is formed. Furthermore, since the first composite beam and the second composite beam are integrated, the two composite beams are integrated to form a high-rigidity composite beam 22 whose end in the segment width direction is reinforced. ing.
Even if a tensile force acts on a joint material such as a bolt by the composite beams 20 and 21, the tensile force of the joint material is attached to the circumferential reinforcing bar 11 from the longitudinal rib 6 (6 a, 6 b) through the concrete 9 by adhesion. It is possible to communicate. Furthermore, due to the high bending rigidity of the composite beam, the bending deformation in the segment width direction as shown by the two-dot chain line in FIG. 14 can be greatly suppressed. Therefore, the strain and stress of the circumferential reinforcing bar 11 are reduced in the width direction of the segment 1. Since it can transmit substantially uniformly, the characteristics, such as the high intensity | strength and high rigidity of the segment main body of the synthetic | combination segment 1, can fully exhibit.
In addition, about installation of the reinforcing material 8, depending on the form of the reinforcing material 8, you may make it install simultaneously with the vertical rib 6 (6a, 6b), and may be after the installation of the vertical rib 6 (6a, 6b). For example, the plate-like reinforcing material 8 may be incorporated at the same time as the longitudinal ribs 6 (6a, 6b), and the reinforcing material 8 such as a rod-shaped steel material may be incorporated at the same time as the longitudinal ribs 6 or after the longitudinal ribs 6 are installed. In the form in which the first vertical rib 6a is provided with a long hole in the longitudinal rib 6a that has a width dimension equal to or larger than the diameter of the reinforcing material 8 and extends in the tunnel radial direction, the reinforcing material 8 is installed after the first vertical rib 6a is installed. May be inserted and arranged.
In addition, in the form of illustration, the groove | channel and water stop material for water stop material installation provided in the side peripheral surface of a steel shell segment were abbreviate | omitted.

According to the present embodiment, since the reinforcing member 8 is installed close to the main beam 2, the bending deformation of the joint plate 3 between the main beam 2 and the reinforcing member 8 is reduced, and the main beam 2 ( 2a), the reinforcing material 8, the first vertical rib 6a, and the concrete surrounded by the second vertical rib can be reduced in shear deformation. Therefore, when a tensile force acts on a joint material such as a bolt, the joint material The tensile force acting on the main girder can be transmitted with high rigidity.
Furthermore, since the composite beams 20 and 21 in the segment width direction are formed, when a tensile force acts on a joint material such as a bolt, deformation in the segment width direction is suppressed by the high bending rigidity of the composite beam, and the joint such as a bolt The tensile force acting on the material can be transmitted to the circumferential reinforcing bars 11 with high rigidity from the longitudinal ribs 6 (6a, 6b) through the filling concrete 9. That is, the composite beams 20 and 21 having high bending rigidity can suppress a leverage reaction force that causes a reduction in the yield strength and rigidity of the joint portion when designing the segment joint. Can be transmitted to the circumferential reinforcing bar 11 with high strength and high rigidity. Further, in order to suppress the deformation in the width direction of the segment as shown in FIG. 14, the strain and the stress degree generated in the main beam 2 and the reinforcing bar 11 in the circumferential direction when the tensile force is applied to the joint material are substantially the same in the width direction. Therefore, the tensile force acting on the joint material can be transmitted to the main girder 2 and the circumferential reinforcing bar 11 with a good balance.
As described above, according to the embodiment, the tensile force acting on the joint material is transmitted in a balanced manner to the circumferential reinforcing bar 11 embedded in the main girder and the filling concrete 9 with high strength and high rigidity. I can do it.
In addition, according to the above-described configuration of the above embodiment, since the structure near the joint portion is simple, a synthetic segment capable of transmitting the tensile force acting on the joint material to the main girder and reinforcing bar of the segment with high strength and high rigidity is inexpensive. Can be realized.
In addition, in the said embodiment, the reinforcement material 8 is parallel to the main girder 2, and the 1st vertical rib 6a adjacent to the joint plate 3 and the joint plate 3, and the 2nd vertical rib 6b adjacent to the 1st vertical rib, Although it is in contact and fixed, the reinforcing material 8 may be in contact with and fixed to the joint plate 3 and the second vertical rib 6b, and may be further extended. Although illustration is omitted, for example, it may be extended to the vertical rib 6 adjacent to the second vertical rib 6b to be abutted and fixed.

  Next, with reference to FIGS. 8-10, the synthetic | combination segment 1 of 2nd Embodiment of this invention is demonstrated.

  FIG. 8 is a bottom view of the composite segment 1 according to the second embodiment as viewed from the inside of the tunnel with a part of the filling concrete 9 removed. FIG. 9 is an explanatory diagram of the stress transmission path of the composite segment 1 shown in FIG. FIG. 10 is a partial perspective view showing one embodiment in the case where the lateral reinforcing plate 14 is provided.

  FIG. 10 shows an embodiment in which the lateral reinforcing plate 14 fixed to at least the main beam 2 (2a) and the reinforcing member 8 is fixed to the lateral reinforcing plate 14 arranged substantially parallel to the skin plate 4 by welding. ing.

In this embodiment, the composite segment 1 is provided with a bolt box 7, and is surrounded by the main beam 2 (2a), the joint plate 3, the reinforcing member 8, and the first vertical rib 6a, as in the first embodiment. Even if the filled concrete 9 is filled in the portion, the concrete compression diagonal material 10 cannot be formed by the filled concrete 9, so that the lateral reinforcing plate 14 is provided instead of the concrete compression diagonal material 10. .
Specifically, the horizontal reinforcing plate 14 is arranged at right angles to the first vertical rib 6a, the reinforcing member 8 and the main beam 2 (2a), and is arranged substantially parallel to the skin plate 4 and fixed thereto by welding. It is provided to do. The lateral reinforcing plate 14 is fixed to at least the main girder 2 (2a) and the reinforcing member 8 by welding, and further fixed to the first vertical rib 6a or the skin plate 4 by welding as necessary to increase the joint strength. You may do it.
As the arrangement position of the lateral reinforcing plate 14 in the tunnel radial direction, as shown in FIG. 10, it may be arranged so as to be located in the middle part in the height direction of the first vertical rib 6a, as shown in FIG. As described above, the skin plate 4 may be disposed close to or in contact with the skin plate 4. Although not shown, the lateral reinforcing plate 14 may be disposed so as to be positioned on the inner side of the tunnel in the height direction of the vertical rib 6. It is preferable in terms of anticorrosion that the lateral reinforcing plate 14 is embedded in the filled concrete 9.
The installation position of the lateral reinforcing plate 14 may be any position in the tunnel radial direction, but when a positive bend (a bending in which the inner side of the tunnel in the composite segment becomes a tension) acts on the segment including the lateral reinforcing plate 14. In order to transmit the tensile force efficiently, it is better to be closer to the inner side of the tunnel. In addition, in the case of negative bending in such a segment 1 (bending in which the tunnel ground side in the composite segment is tensile), the skin plate 4 can play the same role, so that the inside of the tunnel is less than close to the skin plate side. It should be close to the sky side.
Further, as shown in FIG. 10 (b), the transverse reinforcing plate 14 is provided with a hole penetrating in the tunnel radial direction to improve the filling property of the intermediate-filled concrete 9, and also exhibit the effect of preventing the deviation from the concrete. It is good to make it.

As described above, when the lateral reinforcing plate 14 is provided, when a tensile force is applied to the reinforcing member 8 as in the above embodiment, a compressive force is applied to the lateral reinforcing plate 14 as a reaction force of the tensile force. Thus, it can function in the same manner as a concrete compression diagonal. Further, the lateral reinforcing plate 14 also functions as a shear reinforcing steel plate.
The lateral reinforcing plate 14 is made of steel, for example, and the plate thickness is set by design.
As described above, when the lateral reinforcing plate 14 is provided, even when the concrete compression diagonal 10 made of the filling concrete 9 cannot be formed due to the presence of the bolt box 7, the horizontal reinforcing plate 14 is the same as the concrete compression diagonal 10. Can function.
Further, in the embodiment in which the lateral reinforcing plate 14 is provided, the reinforcing material 8 may be provided up to the first vertical rib 6a, and it is not necessary to extend to the second vertical rib 6b, so that the structure is simplified. Needless to say, the reinforcing member 8 and the lateral reinforcing plate 14 may be extended to the second vertical rib or the third vertical rib.
The lateral reinforcing plate 14 may be disposed after the reinforcing material 8 is installed. In this embodiment, the reinforcing member 8 is a space between the joint plate 3 and the first vertical rib 6a after the first vertical rib 6a is installed regardless of the plate-like or rod-like form. Can be appropriately rotated and installed at a predetermined position.
In the above-described embodiment, in the width direction of the composite segment 1, the joint plate 3, the first vertical rib 6a, the main beam 2 (2a) therebetween, each reinforcing member 8, and the lateral reinforcing plate 14 Thus, the composite beam 20 in which the end portion side in the segment width direction is reinforced by the reinforcing members 8 and the lateral reinforcing plate 14 is formed.
In addition, the same code | symbol is attached | subjected to the element similar to the said embodiment, and description is abbreviate | omitted.

  When implementing this invention, the horizontal reinforcement board 14 may be embedded in the filling concrete 9, and does not need to be embedded and arrange | positioned.

According to this embodiment, since the reinforcing member 8 is installed close to the main beam 2 (2a), bending deformation of the joint plate 3 between the main beam 2 (2a) and the reinforcing member 8 is reduced. At the same time, since the lateral reinforcing plate 14 is fixed to the main girder 2 and the reinforcing member 8 surrounded by the main girder 2 (2a), the reinforcing member 8 and the first vertical rib 6a by welding, When a tensile force acts, the tensile force acting on the joint material can be transmitted to the main beam with high rigidity.
Furthermore, since the composite beam 20 in the segment width direction is formed, when a tensile force acts on a joint material such as a bolt (not shown), deformation in the segment width direction is suppressed by the high bending rigidity of the composite beam 20, and a bolt or the like. The tensile force acting on the joint material can be transmitted to the circumferential reinforcing bars 11 with high rigidity from the longitudinal ribs 6 (6a) through the filling concrete 9.
Although not shown, even in the case of the present embodiment, the middle main girder 2b is provided, on the left and right of the middle main girder 2b, close to the middle main girder 2b, and between the joint plate 3 and the first vertical rib 6a. The reinforcing material 8 can also be contacted and fixed. Of course, the reinforcing member 8 and the lateral reinforcing plate 14 can be extended from the first vertical rib 6a, and the cross-sectional shape of the vertical rib 6 can be T-shaped or L-shaped.

  As described above, according to the present invention, a composite structure segment having a segment joint capable of realizing high strength and high rigidity can be obtained, and the tensile force acting on the joint material such as a bolt can be efficiently increased between the main girder and the reinforcing bar. It is possible to obtain a structure that transmits both in a balanced manner at a low processing cost.

  When practicing the present invention, in order to reinforce the joint plate 3 as shown in FIG. 15A or FIG. The joint reinforcing steel plate 23 with a bolt hole and the rod-shaped steel material 24 may be arranged so as to be overlapped, and may be provided so as to be fixed to at least the main girder 2 (2a) and the reinforcing material 8 by welding. May be.

  Although not shown in the drawings, when the present invention is carried out, when the lateral reinforcing plate 14 is provided, the portion surrounded by the main beam 2 (2a), the reinforcing member 8, the joint plate 3, and the first vertical rib 6a. Even if the concrete is omitted, it is possible to substitute the concrete of the portion where the lateral reinforcing material 14 is surrounded.

It is the bottom view seen from the tunnel inner side which shows the synthetic segment of 1st Embodiment of this invention, and shows a partly filled concrete. It is explanatory drawing for demonstrating the transmission path of the stress of the synthetic | combination segment shown in FIG. (A) is explanatory drawing which shows that a concrete compression diagonal is formed, (b) is a vertical front view of the synthetic segment shown in FIG. It is a vertical front view at the time of cut | disconnecting in the bolt box part in the synthetic | combination segment shown in FIG. It is a vertical front view which shows the synthetic | combination segment of a form whose vertical rib is L-shaped cross section. It is a vertical front view which shows the synthetic | combination segment in which a vertical rib has a T-shaped cross section. It is a vertical front view which shows the synthetic segment of the form using a plate-shaped reinforcement. The synthetic | combination segment of 2nd Embodiment of this invention is shown, Comprising: A partly filled concrete is removed, It is the bottom view seen from the sky inside the tunnel. It is explanatory drawing for demonstrating the transmission path of the stress of the synthetic | combination segment shown in FIG. (A) And (b) is a fragmentary perspective view which shows the form in the case of providing a horizontal reinforcement board. It is a fragmentary perspective view which shows the other form in the case of providing a horizontal reinforcement board. The conventional steel segment is shown, Comprising: (a) is a bottom view on one side, (b) is a bottom view showing a joint hardware taken out. It is sectional drawing which shows the arrangement position of the reinforcing bar of the circumferential direction in Fig.12 (a). It is a figure which shows other embodiment of this invention, and is a deformation | transformation explanatory drawing of the coupling and vertical rib in a steel segment. (A) And (b) is a fragmentary perspective view which shows the reinforcement form of a coupling board. It is a figure which shows embodiment which has a middle main girder as a modification of 1st Embodiment of this invention.

Explanation of symbols

1 Composite Segment 2 Main Girder 2a Vertical Rib Adjacent to Joint Plate (First Vertical Rib)
2b A vertical rib adjacent to the first vertical rib (second vertical rib)
3 Joint plate 4 Skin plate 5 Steel shell 6 Vertical rib 6a First vertical rib 6b Second vertical rib 7 Bolt box 8 Reinforcement material 9 Filled concrete 10 Compression diagonal material 11 Reinforcing bar 12 Diagonal line 13 Notch groove 14 Horizontal reinforcing plate 15 Composite segment 16 Steel shell segment 17 Reinforcing plate 18 Anchoring reinforcing bar 19 Joint metal 20 Composite beam 21 Composite beam 22 Composite beam 23 Joint reinforcing steel plate 24 Bar steel A Joint B of first vertical rib and reinforcing material B Joint Joint C between the plate and the main girder Crossing portion D between the second vertical rib and the reinforcing material Crossing portion D between the main girder and the first vertical rib A Crossing portion C between the second vertical rib and the reinforcing material, Diagonal area connecting the main girder and the intersection D of the first vertical rib

Claims (2)

A bolt box for a segment joint is provided inside a steel shell segment composed of a plurality of main girders and a pair of joint plates, a skin plate, and vertical ribs formed in parallel with the joint plate in the segment, The circumferential reinforcing bars and steel shells are integrated by the circumferential reinforcing bars arranged in parallel to the main girder in the circumferential direction of the tunnel and the filling concrete provided in the steel shell segments so as to embed the reinforcing bars in the circumferential direction. In the synthetic segment
The bolt box is arranged close to the main girder, and the reinforcing material is arranged close to the bolt box in parallel to the main girder with the bolt box interposed therebetween, and the reinforcing material is disposed at least from the joint plate to the joint plate. Are installed from the first vertical rib adjacent to the nth (n is 2 or more) vertical ribs, and the joint plate and the vertical rib contact portion with which the reinforcing material contacts are the joint plate and the vertical rib. The synthetic segment is fixed and provided so that the circumferential reinforcing bar extends to a position closer to the joint plate than the n-th vertical rib. A bolt box for a segment joint is provided inside a steel shell segment composed of a plurality of main girders and a pair of joint plates, a skin plate, and vertical ribs formed in parallel with the joint plate in the segment, The circumferential reinforcing bars and steel shells are integrated by the circumferential reinforcing bars arranged in parallel to the main girder in the circumferential direction of the tunnel and the filling concrete provided in the steel shell segments so as to embed the reinforcing bars in the circumferential direction. In the synthetic segment
The reinforcing material is installed in parallel with the main girder from the joint plate to at least the first vertical rib adjacent to the joint plate, the contact portion of the reinforcing material with the joint plate and the vertical rib is fixed, and the joint A horizontal reinforcing plate is disposed substantially parallel to the skin plate between the first vertical rib adjacent to the plate, the main girder, and the reinforcing material, and the horizontal reinforcing plate is welded to at least the main girder and the reinforcing material. A composite segment characterized by being fixed by

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