JPH116400A - How to join steel segments - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a tensile strength equivalent to that of a main girder.
It is an object of the present invention to provide a method for joining steel segments. SOLUTION: This is a steel segment, and an attachment plate insertion opening 2 is opened in a joining surface of the segment.
Is used, a segment having a shelf plate 4 protruding therefrom is used. When constructing a tunnel, tensile joining with short bolts 3 is performed. After the construction, the attachment plate 5 is inserted from the attachment plate insertion opening 2 opened in the joint surface of one segment toward the insertion opening 2 of the other segment, and the attachment plate 5 is inserted into the shelf plate 4 of the segment. Bolt. At the same time, the external attachment plate 6 is bolted to the inner surface of the segment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining steel segments.

[0002]

2. Description of the Related Art A plurality of shield tunnels having a relatively small section are arranged in a row, concrete is connected between the tunnels to construct a tunnel shell, and then an internal section is excavated to form a large section. Construction methods for building tunnels have been developed. In the case of a segment having a large cross section without being limited to such a construction method, the segment main girder is used as a tensile steel material of the RC member.

[0003]

Conventionally, short bolts are used to connect the segments. However, when such short bolts are used, the tensile joining is structurally unsatisfactory with respect to the entire cross-sectional tensile stress state. Could be a weak point. That is, when the entire cross section is in the tensile state, all the tensile stress is transmitted only by the short bolt. However, since the short bolt directly fastens the end plate, when it is made of a tensile steel material, its deformation performance is small. As a result, fragile fracture due to local stress concentration may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a method for joining steel segments which can provide a tensile strength equivalent to that of a main girder. .

[0005]

In order to achieve the above-mentioned object, a method for joining steel segments according to the present invention is directed to a steel segment having an attachment plate insertion port formed on a joint surface of the segment. A segment with a shelf plate protruding inside the insertion slot is used.When constructing a tunnel, tensile joining with short bolts is performed, and after construction, an opening is formed on the joint surface of one segment. The insertion plate is inserted from the inserted insertion plate insertion opening toward the insertion opening of the other segment, and this attachment plate is bolted to the shelf of the segment, and the external connection plate is attached to the inner surface of the segment. The method is characterized in that a steel segment is jointed by bolting.

[0006]

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

<a> The structure of the segment to be used. In the joining method of the present invention, a steel segment 1 is used. Further, in this steel segment, an attachment plate insertion opening 2 is opened in a surface where the segments 1 are joined. A shelf 4 protrudes from the inside of the insertion opening 2.

<B> When constructing a small-section tunnel. When constructing a small-section tunnel using a shield machine, the connection between the steel segments 1 is the same as in the prior art.
As shown in (1), tensile joining with short bolts 3 is performed. The reason for using the short bolts 3 when constructing a small-section tunnel is that it is difficult to handle a long object when constructing a tunnel that requires work in a narrow space, which lowers the work efficiency. For this reason, when excavating the shield tunnel, the segments 1 are connected by the short bolts 3 as in the related art.

<C> When constructing a large section tunnel. When the construction of part or all of the small section tunnel is completed, as shown in FIG. 2, the attachment plate 2 opening at the joint surface of one segment and the insertion opening 2 of the other segment.
The attachment plate 5 is inserted toward. Since the inserted attachment plate 5 is located on both sides of the shelf plate 4 projecting inside the segment, the attachment plate 5 is bolted to the shelf plate 4. At the same time, the external attachment plate 6 is bolted to the inner surface of the tunnel of the segment. In this way, both segments are firmly integrated inside by the attachment plate 5 inserted from the insertion opening 2 and on the inner surface side of the tunnel by the external attachment plate 6 to obtain the same tensile strength as the main girder base material. Can be.

[0010]

As described above, the joint method of the steel segment 1 according to the present invention integrates the two segments by the attachment plate 5 inserted through the insertion opening 2 provided in the end face of the segment. Can transmit the tensile stress around the neutral shaft. Furthermore, since the attachment plate is also attached to the inner side surface of the tunnel of the segment, the tensile stress of the tunnel inner flange of the main girder can be transmitted. Further, in the case of the RC structure, since the end face of the joint portion inside the tunnel is covered with the attachment plate, occurrence of concentrated cracks can be prevented. In this way, the joint part becomes the full strength of the main girder base material,
It will have sufficient proof stress. In addition, during the construction of the tunnel, the bolts are fastened using short bolts, and the attachment plate 5 is attached after the completion, so that the work in the narrow space is not hindered even during the construction of the tunnel, and the work is performed efficiently. It can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which segments are connected by short bolts.

FIG. 2 is an explanatory view of a state before segments are connected by an attachment plate.

FIG. 3 is a cross-sectional view of a state in which segments are connected by an attachment plate.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hirotoshi Musha 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Claims] A tunnel is constructed by using a segment made of steel and having an attachment plate insertion opening at a joint surface of the segment, and a shelf plate protruding inside the insertion opening. When performing the joining, after the work, insert the attachment plate from the attachment plate insertion opening opened on the joint surface of one segment to the insertion opening of the other segment, and A steel segment joint method in which the contact plate is bolted to the segment shelf plate and an external attachment plate is bolted to the inner side surface of the segment tunnel.