JP5696896B2 - Joint structure of steel segment and RC member - Google Patents

Description

  The present invention mainly relates to a joining structure of a steel segment as a steel shell in a shield tunnel and an RC member (reinforced concrete member).

Conventionally, a steel segment as a steel shell of a shield tunnel and an RC member are joined by installing a shear connector such as a stud gibber, a vertical rib, or a perforated steel plate at the joint, or a steel segment at the joint. A structure that efficiently transmits axial force, shear force, and bending moment at the joint by installing a rebar joint and connecting this rebar joint to the RC member's rebar and placing concrete in the joint. Is known (see, for example, Patent Documents 1 and 2).
Moreover, in such a joining structure between the steel segment and the RC member, a structure in which the steel segment as disclosed in Patent Document 1 is joined so as to be wound by the RC member from the outer peripheral surface side and the inner peripheral surface side, or There is a structure in which the RC member is joined from the outer peripheral surface side of the steel segment as disclosed in Patent Document 2.

JP 2010-47968 A Japanese Patent No. 4350629

However, in the structure in which the steel segments are joined so as to be wound by the RC member from the outer peripheral surface side and the inner peripheral surface side, the RC member is arranged inside the shield tunnel and the work such as assembly of the formwork is performed. May interfere with the process.
Moreover, the structure which installs a reinforcing bar joint in the steel segment of a junction, and connects this reinforcing bar joint and the reinforcing bar of RC member is the structure of a reinforcing bar joint and RC member when carrying out shield construction and RC member construction separately. It is difficult to join the reinforcing bar.
Moreover, when installing a reinforcing bar joint or a shear connector in a joint part, since it is necessary to perform the process which installs a reinforcing bar joint or a shear connector beforehand in a steel segment, the processing of this steel segment is simple and economical. It is hoped that.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a joining structure of a steel segment and an RC member that can reliably and easily join the steel segment and the RC member. And

  In order to achieve the above object, the steel segment and RC member joining structure according to the present invention is a steel segment for joining a steel segment as a steel shell and an RC member provided on the outer peripheral surface side thereof. In the joining structure of the RC member, a perforated steel plate in which a hole is formed is joined to the main girder of the steel segment so as to protrude from the outer peripheral surface of the steel segment, and inside the concrete of the RC member. It is characterized by being buried.

In the present invention, the perforated steel sheet joined to the main girder of the steel segment is embedded in the concrete of the RC member, so that the perforated steel sheet becomes a bevel and the steel segment and the RC member are securely and Since it joins by a simple structure, while being able to join a steel segment and RC member easily, it is applicable irrespective of the structure of steel segments, or the structure of RC member.
In addition, since the perforated steel plate is joined to the main girder of the steel segment, the steel plate is stronger and more stable than when the perforated steel plate is joined to the skin plate of the steel segment, for example. Can be joined to the segment.

Moreover, in the joining structure of the steel segment and RC member which concern on this invention, it is preferable that the reinforcing bar of the said RC member is penetrated by the hole of the said perforated steel plate.
By doing in this way, a steel segment and RC member can be joined reliably.

Moreover, in the joining structure of the steel segment and RC member which concern on this invention, it is preferable that the said perforated steel plate is welded to the said main girder.
By doing in this way, since a perforated steel plate can be joined to the main beam from the outside of the steel segment, for example, work for joining the steel segment and the RC member from inside the shield tunnel can be performed. There is no effect on shield construction.

According to the present invention, the perforated steel sheet joined to the main girder of the steel segment is embedded in the concrete of the RC member, so that the perforated steel sheet becomes a gibber and the steel segment and the RC member are securely connected. In addition, since the steel segment and the RC member can be easily joined, the steel segment can be applied regardless of the structure of the steel segment and the structure of the RC member.
In addition, since the perforated steel plate is joined to the main girder of the steel segment, the steel plate is stronger and more stable than when the perforated steel plate is joined to the skin plate of the steel segment, for example. Can be joined to the segment.

It is a figure which shows an example of the shield tunnel by embodiment of this invention. (A) is a perspective view explaining a steel segment and a perforated steel sheet, and (b) is a partially broken view of (a). It is a figure explaining the perforated steel plate bolted to the main girder. It is a figure explaining the junction structure of a steel segment and a duct side wall. It is a figure explaining the joining structure of steel segments and a baseplate.

Hereinafter, the joining structure of the steel segment and RC member by embodiment of this invention is demonstrated based on FIG. 1 thru | or FIG.
As shown in FIG. 1, the joining structure 1 of a steel segment and an RC member according to this embodiment includes a steel segment 2 as a steel shell of a shield tunnel 4 having a circular cross section in the ground, and an outside of the steel segment 2. For example, it is a joining structure with an RC member 3 such as a side wall 3A of a duct or a bottom plate 3B, which is installed so as to abut against the steel segment 2.

As shown in FIGS. 2A and 2B, the steel segment 2 has a hollow portion 23 whose inner peripheral side is opened by welding a skin plate 22 to the outer peripheral end surfaces 21 a of the pair of main girders 21 and 21. Is formed in a ring shape in the circumferential direction and sequentially connected in the tunnel axis direction, and assembled into a cylindrical shape as a whole, thereby primary covering of the shield tunnel 4 (see FIG. 1). Consists of the work.
In the steel segment 2, a perforated steel sheet 24 that becomes a gibber when joined to the RC member 3 (see FIG. 1) is shielded from the outer peripheral end face 21 a of the main girders 21 and 21 than the main girders 21 and 21. It joins so that it may protrude to the outer side which becomes the outer peripheral side of the tunnel 4 (refer FIG. 1).

For example, the perforated steel plate 24 is formed in a substantially rectangular or partial annular plate shape in plan view, and a plurality of hole portions 25 are formed. The position and number of the hole portions 25 of the perforated steel sheet 24 may be arbitrarily set.
As shown in FIG. 3, the side surface of the perforated steel sheet 24 is welded or bolted to the side surfaces 21b of the pair of main girders 21 and 21 facing each other (FIG. 3 shows a state of bolting. ), The side in which the hole 25 is formed may be configured to protrude outward from the main girders 21 and 21 to the outer peripheral side of the shield tunnel 4 (see FIG. 1).
As described above, when the perforated steel plate 24 and the main girders 21 and 21 are bolted, the bolt holes are formed so that the bolts 26 can be inserted into the perforated steel plate 24 and the main girders 21 and 21. .

The steel segment 2 and the RC member 3 described above are joined as follows.
First, after installing the steel segment 2 and constructing the shield tunnel 4 in the shield construction, the cutout portion is formed in the skin plate 22 so that the portion where the perforated steel plate 24 of the outer peripheral end surface 21a of the main girder 21 is joined is exposed. 22a is formed, and the perforated steel sheet 24 is welded to the outer peripheral end face 21a of the main girders 21 and 21.
When the perforated steel plate 24 is bolted to the main girders 21 and 21, an opening through which the perforated steel plate 24 passes is formed in the skin plate 22, and the perforated steel plate 24 is inserted into the opening. And the bolt hole of the perforated steel plate 24 is made to correspond to the bolt hole (not shown) formed in the side surface 21b of the main girders 21 and 21, and the bolt 26 is inserted into these bolt holes to be bolted.

Subsequently, as shown in FIG. 4 and FIG. 5, the RC member 3 is arranged and the formwork is installed so that the perforated steel sheet 24 is embedded therein, and concrete is placed. Here, FIG. 4 shows a case where the perforated steel plate 24 is welded to the main girder 21 with a joining structure of the steel segment 2 and the side wall 3A of the duct, and in FIG. 5, the steel segment 2 and the bottom plate 3B This shows a case where a perforated steel sheet 24 is joined to the main girder by 21 volts.
When the concrete is hardened, the perforated steel plate 24 becomes a gibber and the steel segment 2 and the RC member 3 are joined.

  The perforated steel plate 24 and the bolt holes of the main girders 21 and 21 may be formed in advance, or the bolt holes are formed in the main girders 21 and 21 after the steel segment 2 is installed in the shield tunnel 4. The perforated steel sheet 24 and the main girders 21 and 21 may be joined.

Next, the effect of the joining structure of the steel segment and the RC member described above will be described with reference to the drawings.
According to the joining structure 1 between the steel segment and the RC member according to the present embodiment, the perforated steel plate 24 joined to the main girders 21 and 21 of the steel segment 2 is embedded in the concrete of the RC member 3. Therefore, the steel segment 2 and the RC member 3 are reliably joined with a simple structure as the perforated steel plate 24 becomes a jib, so that the steel segment 2 and the RC member 3 can be joined easily. In addition, the present invention can be applied regardless of the structure of the steel segment 2 and the structure of the RC member 3.
Further, since the perforated steel plate 24 is joined to the main girders 21 and 21 of the steel segment 2, for example, the perforated steel plate 24 is joined to the skin plate 22 of the steel segment 2 or the like. The steel segment 2 can be joined in a stable state.

Further, since the perforated steel plate 24 is welded to the main girders 21 and 21, the perforated steel plate 24 can be joined to the main girders 21 and 21 from the outside of the steel segment 2, so that the inside of the shield tunnel 4 Therefore, the work for joining the steel segment 2 and the RC member 3 is not performed, and the shield construction is not affected.
Even when the perforated steel sheet 24 is bolted to the main girders 21 and 21, the work inside the shield tunnel 4 is only bolt fastening (in some cases, the bolt holes of the main girders 21 and 21 Formation is added) and has little effect on shield construction.

As mentioned above, although embodiment of the joining structure of the steel segment and RC member by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. .
For example, in the above-described embodiment, the side wall 3A of the duct and the bottom plate 3B are raised as the RC member 3 joined to the steel segment 2, but the RC member 3 may be other members.
Further, a reinforcing bar such as a shear reinforcement of the RC member 3 may be inserted into the hole 25 of the perforated steel sheet 24 of the above-described embodiment. By doing so, it is possible to effectively resist the shearing force generated in the steel segment 2.
In the embodiment described above, the steel segment 2 is a steel shell of the shield tunnel 4, but the steel segment 2 of the present embodiment may be used for a structure other than the shield tunnel 4.

DESCRIPTION OF SYMBOLS 1 Joining structure of steel segment and RC member 2 Steel segment 3 RC member 4 Shield tunnel 21 Main girder 24 Perforated steel plate 25 Hole

Claims (3)

In the joining structure of the steel segment and the RC member for joining the steel segment as the steel shell and the RC member provided on the outer peripheral surface side thereof,
A perforated steel sheet in which a hole is formed is joined to the main girder of the steel segment so as to protrude from the outer peripheral surface of the steel segment, and is embedded in the concrete of the RC member. Bonding structure of steel segment and RC member.   The joint structure of the steel segment and RC member of Claim 1 characterized by the above-mentioned. The said perforated steel plate is welded to the said main girder, The joining structure of the steel segment and RC member of Claim 1 or 2 characterized by the above-mentioned.

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