JP6537882B2 - Joint structure of segment - Google Patents

Description

  The present invention relates to a joint structure of segments.

In the shield construction method, TMB construction method, etc., along with the excavation of the underground, the lining of the tunnel is formed by connecting the cylindrical segment rings to the ground.
A segment ring is formed by connecting the end faces of a plurality of segments. A fitting type joint structure is adopted as a connecting portion of such segments.

For example, Patent Document 1 discloses a joint structure of a segment in which an insertion fitting provided in one segment and a receiving fitting provided in the other segment are fitted. The insertion fitting is fixed to the concrete portion of one segment and protrudes from the end face (end plate) of one segment. The bracket is fixed on the concrete part of the segment.
Further, Patent Document 2 discloses a joint structure of segments in which joint members respectively provided in one segment and the other segment are fitted. Each joint member is not fixed to the end plate of the segment but fixed to a reinforcing rib provided substantially parallel to the end plate via an anchor member. Both ends of the reinforcing rib are fixed to the main girder of the segment.

Patent No. 5335524 gazette JP 2012-241450 A

The joint structure described in Patent Document 1 is a structure that transmits a tensile force to a main girder via concrete.
In the joint structure described in Patent Document 2, since the force is transmitted through the reinforcing ribs, the tension spring value is calculated by the distance between the reinforcing ribs of the segments facing each other across the joint structure. Since the tension spring value is calculated by the cross-sectional area and the length of the steel material constituting the joint structure, the tension spring value becomes small if the distance between the reinforcing ribs is large. Therefore, in the joint structure of Patent Document 2, it is necessary to increase the specification of the segment in order to secure the rigidity necessary for lining the tunnel.

  From such a point of view, it is an object of the present invention to propose a joint structure capable of achieving high rigidity of the joint portion.

In order to solve the above problems, the present invention is a joint structure of a segment that locks an insertion member protruding from an end face of one segment to a receiving member formed on the end face of the other segment, The insertion member is fixed to the inner surface of the web of the main girder of the one segment, and has an insertion plate portion whose tip end projects from the end face of the one segment, and a tip end portion of the insertion plate portion And the receiving member is opened continuously in the tunnel axial direction and the tunnel circumferential direction at the corner between the main girder and the end plate of the other segment, and the main It is characterized by comprising a box-shaped receiving main body fixed to a girder, and a receiving locking part which can be engaged with the insertion locking part so as to protrude from the inner surface of the receiving main body.

According to the joint structure of such a segment, since the insertion member and the receiving member are fixed to the main girder, it is possible to directly transmit the tensile force to the main girder.
Further, by directly fixing to the main girder, it is possible to shorten the required length of the insertion member and the receiving member, and it is possible to reduce the amount of steel material and obtain a high tension spring value.

In addition, if the reinforcing material fixed to the main girder of the said other segment is formed in the base end part of the said receiving main-body part, fixation degree with a main girder can be raised.
In addition, if the insertion plate portion and the insertion locking portion are integrally formed by forging, or if the receiving main body portion and the receiving and locking portion are integrally formed by forging, time and effort during manufacturing can be obtained. While being omissible, reduction of the amount of steel materials can also be attained.

  According to the joint structure of the segment of the present invention, cost reduction and high rigidity of the joint portion can be achieved, and therefore, cost reduction accompanying the reduction of the amount of steel material is also possible.

It is a perspective view showing a segment concerning an embodiment of the present invention. It is a perspective view which shows the attachment condition of an insertion member and a receiving member. (A) is the elements on larger scale which show A part of FIG. 1, (b) is the elements on larger scale seen from the back side of (a). It is a figure which shows an insertion member, Comprising: (a) is a side view, (b) is a CC arrow line view of (a), (c) is a DD arrow line view of (a). (A) is the elements on larger scale which show B part of FIG. 1, (b) is the elements on larger scale seen from the back side of (a). It is a figure which shows a receiving member, Comprising: (a) is a side view, (b) is an EE arrow line view of (a), (c) is FF sectional drawing of (a). (A) is a plan view of a receiving member according to another embodiment, (b) is a GG sectional view of (a), (c) is a plan view of an inserting member according to another embodiment, (d) is (c) HH arrow view of).

In this embodiment, a joint structure of segments (hereinafter, simply referred to as “joint structure 4”) for connecting concrete integrated steel segments (hereinafter, simply referred to as “segment 1”) will be described (FIGS. 1 and 2) 2).
As shown in FIG. 1, the segments 1 are formed in a circular plate shape and curved in a plate shape, and a plurality of segments 1 are connected in the circumferential direction to configure a segment ring (not shown). By sequentially joining the segment rings in the axial direction, a tunnel lining is formed.
The segment 1 of the present embodiment is composed of a steel shell 2 and concrete 3 placed in the steel shell 2.

The steel shell 2 includes a pair of main girder 21 and 21 provided at both ends in the tunnel axial direction (only one main girder 21 is shown in FIG. 1) and a pair of end plates 22 provided at both ends in the tunnel circumferential direction. , 22 (only one end plate 22 is shown in FIG. 1) and a skin plate 23 covering the outer surface.
The main girder 21, 21 and the end plates 22, 22 are assembled in a frame shape, and the skin plate 23 blocks the outer peripheral surface side (ground side) of the opening of the main girder 21, 21 and the end plates 22, 22. It is arranged as.

Inside the steel shell 2, a plurality of shape holding members 24, 24,... Are disposed. The shape-retaining material 24 is a plate material disposed along the tunnel axial direction so as to be parallel to the end plate 22. The shape-retaining material 24 is provided upright on the skin plate 23. Further, both ends of the shape holding material 24 are in contact with the plate surfaces of the main girder 21 and 21 respectively.
The main girder 21 is provided with a plurality of inter-ring joints 25, 25. The inter-ring joint 25 connects the segment rings together. The configuration, arrangement, and number of the inter-ring joint 25 are not limited, and may be set as appropriate.

A rectangular through hole 26 is formed at one end of the end plate 22 in the tunnel axial direction (see FIG. 3), and a rectangular notch 27 is formed at the other end (see FIG. 3). 5). That is, the through holes 26 or the notches 27 are formed at both ends of the end plate 22 corresponding to the position of the joint structure 4.
In the main girder 21, rectangular notches 28 are formed corresponding to the positions of the notches 27 in the end plate 22 (see FIG. 5). Openings are formed at the corners of the segment 1 by the notches 27 of the end plate 22 and the notches 28 of the main girder 21.

The concrete 3 is provided with a surface layer portion 31 formed to have a predetermined thickness on the inner surface side of the segment 1 and an inner concrete portion 32 cast inside the steel shell 2.
Further, in the surface layer portion 31, reinforcing bars 33 are embedded as a reinforcing material. In the present embodiment, a reinforcing bar network formed by assembling reinforcing bars in a grid shape is adopted as a reinforcing material, but the reinforcing bars 33 do not necessarily have to be nets, and even if vertical bars and horizontal bars are arranged appropriately Good. In addition, reinforcing bars may be arranged on the inner concrete portion 32 (in the steel shell 2).

The joint structure 4 includes an insertion member 5 and a receiving member 6. As shown in FIG. 2, the segments 1 are joined together by locking the insertion member 5 protruding from the end face of one segment 1 to the receiving member 6 formed on the end face of the other segment 1. .
Although the joint structure 4 (the insertion member 5 and the receiving member 6) of the present embodiment is formed near the center in the thickness direction of the steel shell 2 as shown in FIG. 1, the formation location of the joint structure 4 is limited. It is not a thing. Moreover, the joint structure 4 may be formed in multiple steps.

The insertion member 5 is protruded from the end surface (end plate 22) of the segment 1, as shown to FIG. 3 (a) and (b).
The insertion member 5 includes an insertion plate portion 51 fixed to the main girder 21 of the segment 1 and an insertion locking portion 52 provided to project from the tip end portion of the insertion plate portion 51.

The insertion plate portion 51 is formed of a steel plate and penetrates the through hole 26 of the end plate 22. The base end of the insertion plate 51 is welded to the main girder 21 inside the steel shell 2.
As shown in FIG. 4, the insertion plate portion 51 is formed so that the width dimension of the base end side (portion disposed in the steel shell 2) becomes smaller toward the base end, and the trapezoidal shape is formed It is presenting. The insertion plate 51 does not have to be trapezoidal, and may be, for example, rectangular. Further, the thickness of the insertion plate 51 is not limited, and it is sufficient as long as the strength necessary for joining the segments 1 can be developed. Furthermore, the method of fixing the insertion plate 51 to the main girder 21 is not limited.

The insertion locking portion 52 is a steel member fixed to the plate surface of the insertion plate portion 51. In the present embodiment, the pair of insertion locking portions 52 and 52 are welded to the insertion plate portion 51 so as to face each other with the tip end portion (portion projecting from the end face of the segment 1) of the insertion plate portion 51 interposed therebetween. .
The insertion locking portion 52 of the present embodiment is formed of a square pillar-shaped steel member, but the material constituting the insertion locking portion 52 is not limited. For example, it may be a cylindrical member or a plate material. It may be.
The insertion locking portion 52 is slightly inclined with respect to the tip end surface of the insertion plate portion 51 as shown in FIG. 4C, but the insertion locking portion 52 is parallel to the tip end surface of the insertion plate portion 51 It may be

The receiving member 6 is formed in the end surface (circumferential direction edge part) of the segment 1, as shown to FIG. 5 (a) and (b).
The receiving member 6 includes a receiving body portion 61, a receiving locking portion 62, and a reinforcing member 63, and is disposed inside the steel shell 2.
The receiving main body portion 61 is a box-shaped member fixed to the corner between the main girder 21 of the segment 1 and the end plate 22 and opens in the tunnel axial direction and the tunnel circumferential direction at the corner. There is.

The receiving main body portion 61 of the present embodiment is formed by combining a plurality of steel plates. The receiving body 61 is fixed (welded) to the inner surfaces of the main girder 21 and the end plate 22 so as to cover the notches 27 and 28 formed at the corners of the main girder 21 and the end plate 22. The receiving main body portion 61 may be fixed (welded) to at least the main girder 21 and may not necessarily be fixed to the end plate 22. The fixing method of the receiving body 61 is not limited.
As shown in FIGS. 6 (a) to 6 (c), the receiving main body 61 includes a pair of facing plates 64, 64, a bottom plate 65 straddling the base end of the pair of plates 64, 64, and a pair And a stop plate 66 which shields the inner end of the bottom plate 65. The bottom plate 65 is parallel to the end plate 22 and the stop plate 66 is parallel to the main girder 21 (see FIGS. 5A and 5B).
In addition, the structure of the receiving main-body part 61 is not limited.

The receiving and locking portion 62 is a member capable of locking with the insertion locking portion 52, and is formed on the inner surface of the receiving main body portion 61.
The receiving and locking portion 62 is formed of a pair of square prismatic steel members welded to the facing surfaces of the pair of plate members 64, 64. In addition, the material which comprises the receiving latching part 62 is not limited, For example, a column-shaped member and board | plate material may be sufficient, for example.
The receiving and locking portion 62 is slightly inclined with respect to the tip end surface of the receiving main body portion 61 as shown in FIG. 6C, but the receiving and locking portion 62 is parallel to the tip end surface of the receiving main portion 61 It may be

The reinforcing member 63 is fixed to the main girder 21 of the segment 1 at the proximal end of the receiving main body 61, as shown in FIG. 5 (b).
The reinforcing member 63 is a steel plate disposed at the corner between the receiving main body portion 61 (bottom plate 65) and the main girder 21 and is welded to the bottom plate 65 and the main girder 21. As shown in FIG. 6C, the reinforcing member 63 of the present embodiment is formed in a triangular shape so that the height decreases with distance from the receiving main portion 61, but the reinforcing member 63 is rectangular. It may be.

  When joining the segments 1 to each other, as shown in FIG. 2, the tip of the insertion member 5 of one segment 1 is inserted into the receiving member 6 of the other segment 1 from the opening facing the main girder 21. And in the direction of the tunnel axis (the direction intersecting the main girder 21). At this time, the insertion locking portion 52 of the insertion member 5 slides along the reinforcing material 63 side of the receiving locking portion 62 of the receiving member 6.

According to the joint structure 4 of the present embodiment, since the insertion member 5 and the receiving member 6 are fixed to the main girder 21, it is possible to directly transmit the tensile force to the main girder 21. Therefore, the degree of fixation between the segments 1 is high.
Further, by fixing the insertion member 5 and the receiving member 6 to the main girder 21, the free length (the length of the portion not fixed) of the joint structure 4 becomes short, so the tensile spring value of the joint is high. Rigidity is high. Therefore, the deformation of the tunnel shell can be suppressed.
Further, by fixing the insertion member 5 and the receiving member 6 to the main girder 21, the amount of steel material constituting the joint structure 4 can be minimized, which is economical.

Since the insertion plate portion 51 is formed in a trapezoidal shape, the amount of used steel material is reduced compared to the case of the rectangular shape.
Similarly, since the reinforcing material 63 is formed in a triangular shape, the amount of steel material used is reduced as compared to the case of the rectangular shape.
Further, by directly fixing to the main girder 21, it is possible to shorten the necessary lengths of the insertion member 5 and the receiving member 6, and it is possible to achieve a reduction in the amount of steel material and obtain a high tension spring value.
In addition, since the reinforcing material 63 is formed in the base end part of the receiving main-body part 6, the fixing degree with the main girder 21 is raised.

As mentioned above, although embodiment of this invention was described, this invention is not limited to above-mentioned embodiment, About each said component, in the range which does not deviate from the meaning of this invention, it can change suitably.
Although the said embodiment demonstrated the case where the joint structure 4 was applied to a concrete integral-type steel segment, the segment to which the joint structure 4 can be applied is not limited to this, For example, a steel segment or other synthetic | combination You may adopt it to the segment.

Although the said embodiment demonstrated the case where the receiving member 62 had the reinforcing material 63, the reinforcing material 63 should just be formed as needed. Moreover, although the said embodiment demonstrated the case where the reinforcement material 63 of 1 sheet was arrange | positioned, you may arrange the several reinforcement material 63. FIG.
Moreover, although the said embodiment demonstrated the case where the receiving member 6 was formed by combining steel materials, the structure of the receiving member 6 is not limited, For example, it shows in FIG. 7 (a) and (b) Thus, it may be integrally formed by forging.
Further, the receiving main body 61 may be C-shaped in cross section.

In the said embodiment, about the case where the insertion member 5 is formed by combining steel materials, the structure of the insertion member 5 is not limited, For example, as shown in FIG.7 (c) and (d), it is forging. It may be integrally molded.
Moreover, although the said embodiment demonstrated the case where the cross-sectional shape of the insertion member 5 was cross shape (t-shape), the cross-sectional shape of the insertion member 5 is not limited, For example, even if it is T shape Good (see FIG. 7 (c)).

In the embodiment described above, the case where both the insertion member 5 and the receiving member 6 are formed on the end face of the segment 1 has been described, but any one of the insertion member 5 and the receiving member 6 on the end face of the segment 1 Only may be formed.
Further, in the segment 1, only one of the insertion member 5 and the receiving member 6 may be formed on both end surfaces of the segment 1. In this case, the segments 1 in which only the insertion members 5 are formed and the segments 1 in which only the receiving members 6 are formed may be alternately disposed.

DESCRIPTION OF SYMBOLS 1 segment 2 steel shell 21 main girder 22 end plate 23 skin plate 3 concrete 4 joint structure 5 insertion member 51 insertion plate portion 52 insertion locking portion 6 receiving member 61 receiving main body portion 62 receiving locking portion 63 reinforcing material

Claims (4)

A joint structure of a segment in which an insertion member protruding from an end face of one segment is engaged with a receiving member formed on the end face of the other segment,
The insertion member is
An insertion plate fixed to the inner surface of the web of the main girder of the one segment and having a tip protruding from the end face of the one segment;
Equipped with an insertion locking portion projecting from the said front end portion of the insertion plate portion,
The receiving member is
A box-shaped receiving main body which is opened continuously in the tunnel axial direction and the tunnel circumferential direction at the corner between the main girder and the end plate of the other segment, and fixed to the main girder;
A joint structure of a segment, comprising: a receiving locking portion which can be engaged with the insertion locking portion so as to protrude from the inner surface of the receiving body portion.   The joint structure of a segment according to claim 1, wherein a reinforcement member fixed to the main girder of the other segment is formed at a proximal end portion of the receiving body portion.   The joint structure of segments according to claim 1 or 2, wherein the insertion plate portion and the insertion locking portion are integrally formed by forging.   The joint structure of a segment according to any one of claims 1 to 3, wherein the receiving main body portion and the receiving locking portion are integrally formed by forging.

Images