JPH089277Y2 - Attachment structure for tensile member of shield segment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a tension member to a shield tunnel segment, and more particularly to a tension member provided in order to reduce a bending moment acting on the shield tunnel segment. The present invention relates to a structure for attaching a tensile member of a shield segment capable of dispersing a tensile force acting on the shield segment.

[0002]

2. Description of the Related Art In a shield tunnel segment, a tension member is attached for the purpose of reducing a bending moment acting on this segment. A tie rod, round steel or the like is used for the tension member.

In order to attach the tension member to the attachment portion of the tension member of the conventional segment, a screw is provided at the end of the tension member, while the attachment member for the tension member is fixed to the segment via an anchor bar. A female screw is formed on the mounting member, and the male screw of the tension member is screwed into the female screw of the mounting member for connection.

[0004]

However, in the above-mentioned prior art, since the male screw provided on the tension member and the screw formed on the mounting member are connected to each other by the fitting, the structure of both members is structurally improved. Due to the weak binding force, especially when the attachment position of the tension member is displaced, the binding force of both members becomes extremely weak, and the area for transmitting the tension force acting on the tension member to the attachment member is small. There is a problem that it is difficult to transmit the tensile force acting on the tensile member to the segment, effectively disperse and absorb it.

The present invention has been made in view of the above circumstances. An object of the present invention is to accurately transmit a tensile force acting on a tension member to a segment through a tension member attachment portion, to disperse and absorb the segment. An object of the present invention is to provide a structure for attaching a tensile member of a segment for an obtained shield.

[0006]

In order to achieve the above object, the present invention embeds an anchor metal member 4 for attaching a tensile member in a tension member mounting portion 3 of a segment 1 for a shield tunnel, and the anchor metal member 4 is used as a segment. It is integrated with the segment 1 through a plurality of anchor lines 5 embedded in 1, and the end of the tension member 2 is connected to the anchor metal piece 4 with a bolt 6.

[0007]

In the present invention, the segment 1 is embedded in the tension member attachment portion 3 of the segment 1 and is attached by the anchor bar 5.
Since the end portion of the tension member 2 is connected to the anchor metal piece 4 integrated with the bolt 6 by the bolt 6, the anchor metal piece 4 having a wide area can be used. As a result, the number of anchor lines 5 can be increased and properly arranged, and the segment 1 and the anchor metal piece 4 can be strongly integrated. Also,
The tension member 2 can also have a wide cross-sectional area, and the anchor member 4 can be strongly connected to the tension member 2 by a plurality of bolts 6. As a result, the tensile force acting on the tensile member 2 can be accurately transmitted to the anchor metal piece 4, and the anchor metal piece 4 can disperse and absorb it in the segment 1 through the plurality of properly arranged anchor muscles 5. Become.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a state where a tension member is attached to a segment by the attachment structure of the present invention, and FIG. 2 is an enlarged view of a portion corresponding to A, B, C and D in FIG.
FIG. 3 is a front view of an essential part of an embodiment of the present invention, and FIGS. 3 and 4 are views taken along arrows a and b of FIG. 2, respectively.

In the embodiments shown in these figures, the segment 1 is constructed in a substantially elliptical shape on the peripheral wall of the shield tunnel.

Inside the segment 1, tension members 2 are attached to the upper and lower portions. The tensile member 2 is installed for the purpose of reducing the bending moment acting on the segment 1.

The tension member 2 is attached by an attachment structure in which the anchor metal piece 4 embedded in the tension member attachment portion 3 of the segment 1 is attached with the end of the tension member 2 and is joined by a plurality of bolts 6. There is. As an example of the mode of bolt connection, as shown in the upper right of FIG. 2, a bolt 6 may be screwed into a bolt hole of the thick anchor metal 4, or a thin anchor metal as shown below. It is also possible to have a structure in which the threaded portion of the bolt 6 is provided through the screw 4 and the cap nut 7 is screwed on the protruding threaded portion.

The tension member attachment portion 3 is provided so as to project inside the segment 1, and the upper surface, the lower surface, and the side surface thereof are, in this embodiment, as shown in FIG. 3 and FIG. It is formed in a rectangle of the same width.

The anchor hardware 4 is, as shown in FIG.
Seen from the upper surface or the lower surface, it is formed into a rectangular shape similar to the tension member attachment portion 3, is embedded in the tension member attachment portion 3, and is integrated with the segment 1 by a plurality of properly arranged anchor bars 5. ing. In addition,
2 to 4, in order to make the anchor hardware 4 easy to understand,
Although it is not a cross section, it is shown by hatching.

At least both ends of the tension member 2 are formed to have a rectangular cross section. Then, the end portion of the tension member 2 is brought into contact with the upper surface or the lower surface of the anchor metal piece 4, and as shown in FIGS. 2 to 4, a plurality of pieces inserted into the tension member 2 and screwed into the anchor metal piece 4 are inserted. It is connected and fixed by a bolt 6.

In the embodiment described above, the end of the tension member 2 is connected by the bolt 6 to the anchor metal piece 4 embedded in the tension member attachment portion 3 of the segment 1 and integrated with the segment 1 by the anchor bar 5. Therefore, as can be seen from FIGS. 2 to 4, the anchor metal piece 4 having a large area can be used. Therefore, the anchor muscle 5
It is possible to strongly integrate the segment 1 and the anchor metal piece 4 by increasing the number of the pieces and arranging them properly. Further, the pulling member 2 having a wide cross-sectional area can be used, and moreover, the pulling member 2 can be strongly connected to the anchor metal piece 4 by the plurality of bolts 6. As a result, these together work to accurately transmit the tensile force acting on the tension member 2 to the anchor metal member 4,
The anchor metal 4 can be effectively dispersed and absorbed in the segment 1 through a plurality of properly arranged anchor streaks 5. Therefore, it is possible to reduce the number of attachments of the tension member 2 as compared with the conventional technique. Further, according to the mounting structure of this embodiment, for example, the positions of the segments 1 facing each other are deviated, so that the tension member 2 is moved.
Even if the mounting position of the
Since the area of is wide, the tension member 2 can be easily attached.

Next, FIG. 5 is a front view of an essential part showing another embodiment of the present invention, and FIGS. 6 and 7 are views taken along arrows c and d of FIG. 5, respectively.

In the embodiment shown in FIGS. 5 to 7, the tension member mounting portion 3 provided inside the segment 1 is used.
Are formed in a trapezoidal shape when viewed from the top or bottom surface and are trapezoidal when viewed from the side surface.

The anchor metal piece 4 is formed in an inverted trapezoidal shape similar to the shape of the tension member attachment portion 3 when viewed from the upper surface or the lower surface, and the side surface shape is formed in a rectangle to be inserted into the tension member attachment portion 3. Has been done.

Other configurations of the embodiment shown in FIGS. 5 to 7 are the same as those of the embodiment shown in FIGS.
The same applies to the action.

The mounting structure of the present invention is not limited to the segment having the substantially elliptical shape shown in FIG. 1, but can be applied to the segment having the circular or arcuate rectangular shape.

[0022]

As described above, according to the present invention, the tension member mounting portion 3 of the segment 1 for the shield tunnel is used.
The anchor metal 4 for attaching the tension member is embedded in the segment 1, and the anchor metal 4 is integrated with the segment 1 through the plurality of anchor lines 5 embedded in the segment 1, and the end of the tension member 2 is attached to the anchor metal 4. Since the parts are connected by bolts 6 and the anchor metal piece 4 having a large area can be used, the number of the anchor bars 5 is increased and properly arranged, and the segment 1 and the anchor metal piece 4 are strongly integrated. That the pulling member 2 has a large cross-sectional area, and the anchor metal 4 can be attached to the pulling member 2 as well.
The fact that they can be strongly coupled with a plurality of bolts 6 and the like contributes to accurately transmitting the tensile force acting on the tension member 2 to the anchor metal piece 4, and the plurality of properly arranged anchor metal pieces 4 can be used. There is an effect that it can be dispersed and absorbed in the segment 1 through the anchor muscles 5 of the book.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a tension member is attached to a segment according to the attachment structure of the present invention.

FIG. 2 is an enlarged view of a part of FIG. 1 and is a front view of a main part of an embodiment of the present invention.

FIG. 3 is a view on arrow a of FIG.

FIG. 4 is a view on arrow b in FIG.

FIG. 5 is a front view of an essential part of another embodiment of the present invention.

6 is a view on arrow c in FIG.

FIG. 7 is a view on arrow d in FIG.

[Explanation of symbols]

 1 Segment for shield tunnel 2 Tensile member 3 Part for attaching tension member 4 Anchor metal 5 Anchor bar 6 Bolt for attaching tension member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takekazu Homma 1-24-4 Shinkawa, Chuo-ku, Tokyo Within Daihoken Construction Co., Ltd. (72) Hirohide Hashimoto 2-6-21 Yaesu, Chuo-ku, Tokyo Ishikawajima Building Materials Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An anchor metal piece 4 for attaching a tension member is embedded in a tension member attachment portion 3 of a segment 1 for a shield tunnel, and the anchor metal article 4 is inserted through a plurality of anchor bars 5 embedded in the segment 1. An attachment structure for a tensile member of a shield segment, characterized in that the tensile member 2 is integrated with the segment 1 and the end of the tensile member 2 is connected to the anchor metal piece 4 with a bolt 6.