JP3239289B2 - Steel segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel segment used for shield construction.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a steel segment processed by using a steel plate as a material and assembled is known. Its structure is a ring-to-ring joint flange 13,
It may be made of a steel plate member of the inter-segment flange 14 and the skin plate 15, and a stiffening rib 16 may be provided as a member as necessary.

[0003]

As described above, the conventional steel segment 1 is prepared by separately preparing each of the steel plate members and joining them to form the steel segment 1. It requires a lot of man-hours, is not suitable for mass production and labor saving, and has the disadvantage of cost increase. In addition, as a measure against buckling caused by the shield jack, stiffening ribs 16
However, there is a need for a steel segment that does not require such additional component elements.

An object of the present invention is to provide a steel segment which is suitable for labor saving and mass production, has excellent strength, and is advantageous in terms of construction cost in view of the above-mentioned problems of the prior art.

[0005]

SUMMARY OF THE INVENTION A steel segment according to the present invention is characterized in that an H-shaped steel is subjected to bending deformation so as to have a constant curvature in a plane parallel to a flange surface of the H-shaped steel, and both ends of a web of the H-shaped steel. To the joint flange between segments,
The flange of the H-shaped steel is used as a joint flange between rings of steel segments, and concrete is filled along the outer peripheral side of the web surface to form a coating layer on the outer periphery of the steel segments. In the present invention, the H-shaped steel refers to an H-shaped steel that can serve as a member of a steel segment.
It is used to include those with a cross-sectional shape similar to a shape steel.
Therefore, it includes Type I steel. Hot-rolled H-beams and the like can be used. The H-section steel is bent so as to have a certain curvature as a steel segment. After the bending, the flange of the H-shaped steel becomes the inter-ring joint flange of the segment, and the web of the H-shaped steel becomes the joining member joining the inter-ring joint flanges on both sides. In the conventional steel segment, since the skin plate is joined to the outer peripheral edge of the inter-ring joint plate, a stiffening rib may be provided in order to prevent deformation of the inter-ring joint flange due to the shield jack. In the present invention, the H-shaped steel web joins the ring-to-ring joint flanges on both sides at the center of the width of the ring-to-ring joint flange, so that the steel segment can sufficiently secure the proof strength without providing the stiffening rib. In the present invention, the steel portion of the steel segment can be completed simply by connecting the inter-segment joining flanges to both ends of the web of the H-beam as another component. In the steel segment of the present invention, the bending of the H-section steel and the joining of the inter-segment joining flanges to both ends of the web of the H-section steel may be performed before or after the procedure. Concrete is filled along the outer surface side of the web surface of the steel segment to form a coating layer on the outer periphery of the segment. The concrete coating layer not only forms a segment of the composite structure integrally with the steel portion, but also plays a role in preventing the web portion and the like from being corroded. The filling of concrete may be precast or performed on site.

In addition, the steel segment of the present invention is capable of bending and deforming the H-shaped steel so as to have a constant curvature in a plane perpendicular to the web surface, including the axis of the H-shaped steel in the height direction of the web. The H-shaped steel flange is used as the inter-segment joining flange of the steel segment, and concrete is filled along the outer peripheral side of the web surface to form a coating layer on the outer periphery of the segment. It is constituted by doing. The present invention is the same as described above, except that the direction of the bending deformation of the H-shaped steel and the flange of the H-shaped steel are the inter-segment joining flanges of the steel segments.

Further, the steel segment of the present invention is a segment which is formed as a structural unit of a segment structure by forming an H-shaped steel into a bent line shape in the longitudinal direction, and sandwiches the bent portions or sandwiches the bent portions. A segment unit is formed between the intermediate portions, and an inter-segment joining flange is connected to both ends of the H-shaped steel web serving as the segment unit, and the H-shaped steel flange is used as a segment ring-joining flange, and is fixed to the outer peripheral side of the web surface. Is formed by filling the concrete with the curvature of and forming a coating layer on the outer periphery of the segment.
This steel segment is applied not only when the entire segment structure constituted by assembling the steel segments is constituted by the steel segments of the present invention, but also a part of the constituent elements is constituted by the steel segments. In some cases. For example, a segment structure may be formed in combination with the steel segment according to claim 1 or claim 2.

[0008] A bolt hole is formed along the inner peripheral side of the web at the joint flange between rings and / or the joint flange between segments. Preferably, the dowel is connected to the outer peripheral surface of the web surface.

[0009]

According to the steel segment of the present invention, the H-shaped steel is used as a basic component of the steel portion, and the H-shaped steel is bent.
Alternatively, the steel portion of the steel segment can be formed by connecting the inter-ring joint flange or the inter-segment joint flange to both ends of the web without performing bending. Since the H-shaped steel web constituting the steel segment connects the inter-ring joint flanges on both sides at the center of the width of the inter-ring joint flange, sufficient strength can be secured as a steel segment without providing stiffening ribs. The concrete covering layer along the outer side of the web surface of the steel segment forms a composite structure segment integrally with the steel portion and serves to prevent the web portion and the like from being corroded.

[0010]

An embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, in manufacturing the steel segment 1,
First, the H-shaped steel 2 is subjected to bending deformation so as to have a constant curvature in a plane a parallel to the flange 3 surface of the H-shaped steel 2. Next, the inter-segment joining flanges 5 are joined to both ends of the web 4 of the H-section steel 2. The flange 3 of the H-section steel 2 serves as an inter-ring joining flange of the steel segment 1. Concrete is filled along the outer peripheral side of the web 4 surface of the steel segment 1 to form a coating layer 7 on the outer periphery of the steel segment 1. A bolt hole 11 is formed along the inner peripheral side of the web surface in the inter-ring joint flange (flange 3) and the inter-segment joint flange 5. A dowel 12 is provided on the outer peripheral surface of the web surface.
To join.

In FIG. 2, the H-shaped steel 2 is subjected to bending deformation so as to have a constant curvature in a plane b including an axis c in the height direction of the web 4 and orthogonal to the web surface. Prior to bending deformation, inter-ring joint flanges 6 are connected to both ends of the web of the H-section steel 2. The flange 3 of the H-section steel 2 becomes the inter-segment joining flange 5 of the steel segment 1. Concrete is filled along the outer peripheral side of the web surface 4 of the steel segment 1 to form a coating layer 7 on the outer periphery of the steel segment.

In FIG. 3, a steel segment 1 is formed by forming an H-shaped steel 2 into a bent line shape in the longitudinal direction and forming a segment structure 8.
This is a segment that is a constituent unit of. Steel segment 1
Is a unit of the segment between the bent portions 9 (FIG. 3A) or between the intermediate portions 10 across the bent portion 9 (FIG. 3D). The inter-segment joining flanges 5 are connected to both ends of the web 4 of the H-shaped steel 2 as a unit of the steel segment 1, and the flanges 3 of the H-shaped steel 2 become the inter-ring joining flanges 6 of the steel segment 1. Concrete is filled on the outer peripheral side of the web surface with a constant curvature to form a coating layer 7 on the outer periphery of the steel segment 1.

[0013]

According to the present invention, the following effects can be obtained. (1) In the present invention, a steel portion of a steel segment is formed by performing bending deformation on an H-shaped steel and connecting a joint flange between rings and / or a joint flange between segments to both ends of the web after the bending deformation. The number of steel members to be joined is small, and it is excellent in labor saving and mass production. The same applies to the case where the segment structure is made of a steel segment in the bent portion. (2) In the present invention, since the H-shaped steel web joins the ring-to-ring joint flanges on both sides at the center of the width of the ring-to-ring joint flange, it is necessary to provide stiffening ribs from the viewpoint of securing rigidity in the conventional steel segment. Even in the case where there is, sufficient proof stress can be secured without providing the stiffening rib. (3) The concrete coating layer along the outer surface side of the web surface of the steel segment forms a segment of a composite structure integrally with the steel portion, and serves to prevent the web portion and the like from being corroded.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention. (A) is a perspective view, (B) is a side view, and (C) is a diagram illustrating bending deformation.

FIG. 2 is a diagram illustrating another embodiment of the present invention.
(A) is a perspective view, (B) is a side view, and (C) is a diagram illustrating bending deformation.

FIG. 3 is a diagram for explaining another embodiment of the present invention.
(A) is a side view, (B) is a cross-sectional view along AA, (C) is a view showing a part of the segment structure, and (D) is a side view of another embodiment different from (A).

FIG. 4 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel segment 2 H-shaped steel 3 Flange 4 Web 5 Segment joining flange 6 Ring joining flange 7 Coating layer 8 Segment structure 9 Folding part 10 Middle part 11 Bolt hole. 12 dowel 13 ring-to-ring joint flange 14 segment-to-segment joint flange 15 skin plate 16 stiffening rib

Claims (5)

(57) [Claims] The H-shaped steel is subjected to bending deformation so as to have a constant curvature in a plane parallel to the flange surface of the H-shaped steel, and an inter-segment joining flange is connected to both ends of a web of the H-shaped steel. Characterized in that the flange of (1) is a joint flange between rings of steel segments, and concrete is filled along the outer peripheral side of the web surface to form a coating layer on the outer periphery of the steel segments. 2. The H-shaped steel is subjected to bending deformation so as to have a constant curvature in a plane perpendicular to the web surface including the axis of the H-shaped steel in the height direction of the web, and ring-to-ring bonding is performed at both ends of the web of the H-shaped steel. The flanges are combined, the H-shaped steel flanges are used as inter-segment joining flanges of steel segments, and concrete is filled along the outer peripheral side of the web surface to form a coating layer on the outer periphery of the steel segments. And steel segment. 3. A segment which is formed as a structural unit of a segment structure by forming an H-shaped steel into a bent curve shape in the longitudinal direction, wherein a unit between the bent portions or an intermediate portion between the bent portions is a segment unit. , The inter-segment joining flanges are connected to both ends of the H-section steel
A steel segment characterized by forming a flange of a mold steel as a joint flange between rings of a steel segment, filling concrete with a constant curvature on an outer peripheral side of a web surface to form a coating layer on an outer periphery of the steel segment. . 4. The steel according to claim 1, wherein a bolt hole is formed along an inner peripheral side of the web in the ring-to-ring joint flange and / or the segment-to-segment joint flange. Segment. 5. The steel segment according to claim 1, wherein a dowel is connected to an outer peripheral surface of the web surface.