JP3390937B2 - Steel segment fitting method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining steel segments. 2. Description of the Related Art In the construction of a shield tunnel, a tunnel is constructed by assembling segments behind the shield tunnel machine as the tunnel machine excavates. Conventionally, when assembling the segments, a tension joining method of assembling with short bolts is generally used. [0003] However, the segment used for the shield tunnel of a modified cross section is different from the segment of a general circular shield tunnel, and the main girder is a bending member. Therefore, it is necessary to develop a joint method for a segment having sufficient rigidity against bending. The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method for joining steel segments having a sufficient strength against bending. [0005] In order to achieve the above-mentioned object, a method for joining steel segments according to the present invention is characterized in that the end plate of the joining surface of the segments is placed only above the neutral shaft. Using the installed steel segments, the end plates above the neutral axis of the segments are mutually connected by short bolts at the time of joining, and the open part below the neutral axis is orthogonal to the central axis direction of the tunnel One end of the attachment plate is bolted to the web of the main girder, the other end of the attachment plate is bolted to the web of the main girder of the adjacent segment, and the lower flanges of the main girder of both segments are attached to the attachment plate. It is done by bolting using
It is characterized by a method of joining steel segments. Embodiments of the present invention will be described below with reference to the accompanying drawings. <A> Shape of segment In the method according to the invention, a steel segment 1 is used. In this segment 1, the end plate 2 is installed only above the neutral axis without attaching the end plate of the joint surface to the entire surface. Therefore, the lower half of the end plate 2 is open. <B> End plate 2 joining. At the time of joining, when the end plate 2 side of the adjacent segment 1 is provided, the end plate 2 above the neutral axis of the segment 1 comes into contact. Then, the end plates 2 are joined to each other by short bolts 3. <C> Fixing the bolt of the attachment plate. Since the lower part of the neutral shaft, that is, the lower part of the end plate 2 is in an open state, the web 41 of the main girder 4 orthogonal to the central axis direction of the tunnel and the upper and lower surfaces of the lower flange 42 of the main girder 4 5 is fixed at one end with bolts. The other end of the attachment plate 5 is connected to the web 4 of the main girder 4 of the adjacent segment 1.
1 and the lower flange 42. The main girder 4 is provided with a bolt hole, and the attachment plate 5 is also provided with a bolt hole at the same position. Therefore, it is possible to set a bolt from both sides of the main girder 4, and a nut is attached to a screw portion exposed from the bolt hole and tightened. In this way, the fixing of the segments 1 on the inner space side is performed simultaneously with the fixing of the segments 1 by the bolts. In this way, the segments 1 are fixed firmly by bolts on the ground side and fixed by friction joining using an attachment plate and bolts on the inner space side. As described above, the joint method of the steel segment 1 according to the present invention, as described above, fixes the end plate 2 on the ground side with respect to the neutral axis of the segment 1 with bolts, and pulls the end plate 2 with respect to the neutral axis. , The attachment plate 5 is bolted and fixed by friction joining. Accordingly, the joint portion can obtain sufficient rigidity against bending, which is equal to or greater than that of the main girder 4 portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of a method for joining steel segments according to the present invention. FIG. 2 is an explanatory view of a state where an attachment plate is attached to an additional flange. FIG. 3 is an explanatory view of a state where segments are joined together.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshifumi Hattori 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation Co., Ltd. (56) References JP-A 7-208087 (JP, A) Hei 10-280886 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 11/14-11/15 E21D 11/04

Claims (1)

(57) [Claims] [Claim 1] A steel segment in which the end plate of the joining surface of the segment is installed only above the neutral axis, and when joining, the steel segment is above the neutral axis of the segment. The end plates are joined to each other by short bolts, and at the opening below the neutral axis, one end of the attachment plate is fixed to the web of the main girder perpendicular to the center axis direction of the tunnel with bolts. The other end of the plate is bolted to the web of the main girder of the adjacent segment, and the lower flange of the main girder of both segments is bolted and fixed using an attachment plate.