JP2016216893A - segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment capable of easily suppressing the out-of-plane deformation of a flange at low cost.SOLUTION: A segment 1 includes a pair of main girders 4 and 4 disposed at both ends of a tunnel in the axial direction, a pair of end plates 5 and 5 disposed at both ends of a tunnel in the circumferential direction, a skin plate 6 for covering the ground-side end faces of the pair of main girders 4 and 4 and the pair of end plates 5 and 5, a plurality of shape holding member 7, 7, ... horizontally disposed at intervals between the main girders 4, in parallel with the end plates 5 and 5, and a reinforcement member 8 of which one end is fixed to a flange 42 arranged on the internal face of the main girder 4, and another end is fixed to the shape holding member 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a segment constituting a tunnel covering body by connecting a plurality of them together.

In the shield method, the TBM method, and the like, a tunnel lining is formed by connecting a tubular segment ring in the ground along with excavation of natural ground. The segment ring is formed by connecting end surfaces (end plates) of a plurality of segments.
Such a segment 100 includes a skin plate 101 forming an outer peripheral surface, main girders 102 provided at both ends in the tunnel axial direction, and end plates (not shown) provided at both ends in the tunnel circumferential direction. It is common (see FIG. 5).

In a section where bending deformation is expected to increase, as shown in FIG. 5, a flange 103 may be formed on the main girder (web 102) to increase rigidity and strength. If the cross-sectional area of the main girder is increased by the flange 103, the rigidity and strength of the segment 100 can be further increased. In FIG. 5, reference numeral 104 denotes a shape retaining material.
When the abdominal pressure P is generated in the segment 100 having the flange 103, the out-of-plane deformation of the flange 103 toward the inner space of the tunnel tends to increase. If the flange 103 is subjected to large out-of-plane deformation in the concrete-filled segment or the segment 100 having the covering concrete 105 on the inner surface side, the concrete 105 may be cracked or the concrete 105 may be peeled off.
Further, when the flange 103 undergoes out-of-plane deformation due to the abdominal pressure, cracking of the concrete or separation between the flange 103 and the concrete occurs, and the integral behavior of the main girder 103 and the filled concrete is impaired, and the lining is performed. There is concern that the overall rigidity and proof stress will decrease.

  For this reason, Patent Document 1 discloses a segment that suppresses out-of-plane deformation of the flange by connecting the flange of the main beam and the web with a connecting member. Patent Document 1 discloses a segment that suppresses out-of-plane deformation of the flange by connecting the flanges of the main girder and the skin plate, or flanges disposed on the upper and lower sides (outer and inner sides) of the main girder by connecting members. Is also disclosed.

JP 2011-47267 A

Since the out-of-plane deformation of the flange due to the abdominal pressure is caused by the rotational force of the segment end (web), it cannot be suppressed even when the fixing degree between the flange and the web is increased.
Further, since it is necessary to form the connecting member into a shape that fits in a main girder having a U-shaped cross section, high processing accuracy is required, and manufacturing takes time. Moreover, since the connection member of the height according to the space | interval of a flange and a skin plate or flanges is used, the amount of steel materials will increase.

  From such a viewpoint, an object of the present invention is to propose a segment that can suppress the out-of-plane deformation of the flange easily and inexpensively.

In order to solve the above problems, a segment of the present invention includes a pair of main girders provided at both ends in the tunnel axis direction, a pair of end plates provided at both ends in the tunnel circumferential direction, the pair of main girders and A skin plate that covers end surfaces of the pair of end plates on the natural ground side, a plurality of shape holding members that are laid between the main girders at intervals in parallel with the end plates, and a tunnel inner surface of the main girders And a reinforcing member having one end fixed to the flange formed on the side and the other end fixed to the shape holding member.
The reinforcing member is preferably a bar or plate that is erected on the flange.

According to this segment, since the reinforcing member resists the out-of-plane deformation of the flange with a tensile force, the deformation of the flange can be suppressed.
Since the reinforcing member is disposed between the flange and the shape maintaining material, the amount of the steel material can be minimized. Further, since the reinforcing member only needs to be fixed to the plate surface of the shape-retaining material, it is not necessary to require high accuracy during manufacturing, and can be manufactured relatively easily.

  According to the joint structure of the present invention, the out-of-plane deformation of the flange can be suppressed easily and inexpensively.

It is a perspective view which shows the segment which concerns on embodiment of this invention. (A) is a XX arrow view of FIG. 1, (b) is the YY arrow view. (A) is an enlarged view which shows the junction part of a shape retention material and a skin plate, (b) is an enlarged view which shows the junction part of a reinforcement member and a shape retention material. (A) is an enlarged longitudinal sectional view showing a reinforcing member according to another embodiment, (b) is an enlarged longitudinal sectional view showing a reinforcing member according to another embodiment. It is sectional drawing which shows the conventional segment.

In this embodiment, as shown in FIG. 1, a concrete-integrated steel segment (hereinafter referred to as “segment 1” at the end) composed of a steel shell 2 and concrete 3 placed in the steel shell 2. Will be described.
The segment 1 is formed in a plate shape curved in an arc shape, and a segment ring (not shown) is formed by connecting a plurality of pieces in the circumferential direction. When the segment rings are sequentially joined in the axial direction, a tunnel lining is formed.
The steel shell 2 includes a pair of main girders 4, 4, a pair of end plates 5, 5, a skin plate 6, a plurality of shape holding members 7, 7,. Yes.

The pair of main girders 4 and 4 are provided at both ends of the segment 1 in the tunnel axis direction.
The main girder 4 is made of a steel member formed in an arc shape according to the cross-sectional shape of the tunnel.
The main girder 4 of this embodiment is provided with the web 41 and the flanges 42 and 42 each provided in the natural mountain side edge part of the web 41, and the tunnel inner side edge part, as shown to Fig.2 (a). Yes. That is, the main girder 4 of the present embodiment has a U-shaped cross-sectional view due to the web 41 and the pair of flanges 42 and 42.
Although the main girder 4 of this embodiment is formed by welding the steel plate which comprises the web 41, and the steel plate which comprises the flange 42, the formation method of the main girder 4 is not limited. Further, the main girder 4 only needs to have a flange 42 formed at least on the air side inside the tunnel, and does not necessarily have to include the flange 42 on the natural ground side.

As shown in FIG. 1, the main girder 4 is formed with a plurality of inter-ring joints 11, 11,. The inter-ring joint 11 connects the segment rings. In addition, the structure, arrangement | positioning, and number of the joints 11 between rings are not limited, What is necessary is just to set suitably.
A rectangular notch 43 is formed at one end of the main beam 4 corresponding to the position of the joint member 13. The notch 43 may be formed according to the configuration of the joint member 13, and the arrangement, shape, and presence of the notch 43 are not limited.

As shown in FIG. 1, the pair of end plates 5 and 5 are provided at both ends in the tunnel circumferential direction. The end plate 5 is made of a rectangular steel plate and is horizontally mounted on the end portions of the pair of main girders 4 and 4.
A rectangular through hole 51 is formed at one end of the end plate 5 in the tunnel axis direction, and a rectangular notch 52 is formed at the other end. That is, through holes 51 or notches 52 are formed at both ends of the end plate 5 corresponding to the positions of the joint members 12 and 13, respectively. An opening is formed at the corner of the segment 1 by the notch 52 of the end plate 5 and the notch 43 of the main girder 4. The through holes 51 and the notches 52 may be formed according to the configuration of the joint members 12 and 13. That is, the arrangement, shape, and presence / absence of the through hole 51 and the notch 52 may be appropriately set according to the configuration of the joint members 12 and 13.

The joint members 12 and 13 are members for connecting the segments 1 to each other. In the present embodiment, the segments 1 are connected to each other by engaging the joint member 12 protruding from the end surface of one segment 1 with the joint member 13 formed on the end surface of the other segment 1.
As shown in FIG. 1, the joint members 12 and 13 of the present embodiment are formed in the vicinity of the center of the steel shell 2 in the thickness direction, but the locations where the joint members 12 and 13 are formed are not limited. The joint members 12 and 13 may be formed in a plurality of stages.
Furthermore, the joint structure (structure of the joint members 12 and 13) for joining the segments 1 is not limited.

As shown in FIGS. 2A and 2B, the skin plate 6 covers the end face of the segment 1 on the natural ground side.
The skin plate 6 is a steel plate arranged so as to close the outer peripheral surface side (natural mountain side) of the openings of the main girders 4 and 4 and the end plates 5 and 5 assembled in a frame shape (FIG. 2 (a) and (See (b)).

As shown in FIG. 1, the shape retaining members 7, 7,... Are arranged at intervals in the inner spaces of the main girders 4 and 4 and the end plates 5 and 5 assembled in a frame shape. The shape retaining material 7 is laid across the main girders 4 so as to be parallel to the end plate 5.
The shape retaining material 7 is made of a steel plate, and as shown in FIG. 2 (a), the natural mountain side end surface is in contact with the skin plate 6, and both ends in the tunnel axial direction are in contact with the plate surfaces of the main girders 4 and 4, respectively. ing.

The shape retaining material 7 has concave portions 71 and 71 at the joint portion with the skin plate 6, and corner cutting portions 72 and 72 at corner portions on the skin plate side (corner portions of the web 41 and the flange 42). doing. In the present embodiment, three recesses 71, 71, 71 are formed, but the number of recesses 71 is not limited. Moreover, what is necessary is just to form the recessed part 71 and the corner cut part 72 as needed.
As shown in FIGS. 3A and 3B, the shape retaining material 7 is welded at a contact portion 73 with the skin plate 6 in a portion other than the recess 71, and the end portion 74 has a web 41 and a flange. 42 is welded.
In addition, in this embodiment, although it welds to the skin plate 6 in the zigzag form on the one surface and the other surface of the shape holding material 7, the fixing method of the shape holding material 7 is not limited.

As shown in FIG. 3 (b), the reinforcing member 8 has one end 81 fixed to the flange 42 on the inner side of the tunnel and the other end 82 fixed to the shape retaining member 7.
The reinforcing member 8 of the present embodiment is configured by a bar having a rectangular cross section. In addition, the width dimension of the bar which comprises the reinforcement member 8 is not limited. Moreover, the cross-sectional shape of the bar which comprises the reinforcement member 8 is not limited to a rectangle, For example, a circular cross section, an elliptical cross section, an oval cross section, or another polygonal cross section may be sufficient.
Further, the reinforcing member 8 is not limited to a bar. For example, a plate material may be used as shown in FIG. 4A, or an L-shaped steel material as shown in FIG. 4B. In addition, when using a board | plate material as the reinforcement member 8, the board thickness and board width of the reinforcement member 8 are not limited, What is necessary is just to set suitably.
As shown in FIG. 3B, the reinforcing member 8 is erected on the plate surface of the flange 42. One end 81 of the reinforcing member 8 is welded to the plate surface of the flange 42. Further, the other end 82 of the reinforcing member 8 is welded to the shape holding material 7 in a state of being overlapped on the plate surface of the shape holding material 7.

As shown in FIG. 1, the concrete 3 includes a surface layer portion 31 formed with a predetermined thickness on the inner surface side of the segment 1, and an internal concrete portion 32 formed inside the steel shell 2. .
Further, a reinforcing bar 33 is embedded in the surface layer portion 31 as a reinforcing material. In the present embodiment, a reinforcing bar net formed by assembling reinforcing bars in a lattice shape is adopted as the reinforcing material. However, the reinforcing bar 33 is not necessarily a net, and the vertical bars and the horizontal bars may be appropriately arranged. Good. Further, reinforcing bars may also be arranged in the internal concrete portion 32 (in the steel shell 2).

  According to the segment 1 of the present embodiment, the reinforcing member 8 that connects the flange 42 and the shape retaining material 7 resists the deformation of the flange 42 by resisting the out-of-plane deformation of the flange 42 with a tensile force. (Minimize). Therefore, even when an abdominal pressure is applied to the segment 1, cracking or peeling of the concrete 3 due to the out-of-plane deformation of the flange 42 can be prevented.

Since the reinforcing member 8 is disposed between the flange 42 and the shape retaining material 7, the amount of steel material can be minimized.
Moreover, since the reinforcement member 8 should just be fixed to the plate surface of the shape maintenance material 7, it can be manufactured comparatively easily. In other words, the reinforcing member 8 only needs to secure an overlap allowance necessary for joining with the shape maintaining material 7, and therefore does not need to require high accuracy during manufacturing.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.
In the above-described embodiment, the case where the reinforcing member 8 is applied to a concrete-integrated steel segment has been described. However, the segment to which the reinforcing member 8 can be applied is not limited to this, and for example, a steel segment or other composite May be adopted for the segment.
Moreover, although the said embodiment demonstrated the case where the concrete 3 (internal concrete 32) was also laid in the inside of the steel shell 2, the concrete 3 is the surface of the steel shell 2 (inner side). It may be placed only.
For example, the concrete 3 may be appropriately selected from ordinary concrete, high-strength concrete, high-fluidity concrete, fiber-reinforced concrete, etc., depending on the stress acting on the tunnel lining and the cross-sectional shape of the tunnel. .
In the above-described embodiment, the case where the reinforcing member 8 made of a rod-like member is welded to the flange 42 has been described. However, the fixing method of the reinforcing member 8 is not limited, and for example, threading is performed via a nut. The reinforcing member 8 may be screwed to the flange 42.

1 Segment 2 Steel Shell 3 Concrete 4 Main Girder 41 Web 42 Flange 5 End Plate 6 Skin Plate 7 Shape Retaining Material 8 Reinforcement Member

Claims (2)

A pair of main girders provided at both ends in the tunnel axis direction;
A pair of end plates provided at both ends of the tunnel circumferential direction;
A skin plate that covers the pair of main girders and the end surfaces of the pair of end plates on the natural ground;
A plurality of shape-retaining materials horizontally placed between the main girders at intervals in parallel with the end plates;
And a reinforcing member having one end fixed to a flange formed on the inner surface side of the tunnel of the main girder and the other end fixed to the shape retaining member.   The segment according to claim 1, wherein the reinforcing member is a bar or a plate provided upright on the flange.

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