JPH10339099A - Rectangular steel segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength by providing an H-shaped member which is attached to an end part joint part of a segment and with which flange faces come in contact mutually and connection bolt which passes through flanges of the H shaped member and tightens them mutually in a joint part. SOLUTION: H-shaped members 2a, 2b are attested to end parts of adjacent segments 1a, 1b, respectively, and the H-shaped members 2a, 2b are attached in such a manner that flanges 3, 3 come in contact with flange outer faces mutually adjacent H-shaped members. The H-shaped members 2a, 2b are provided with a hole through which four flanges pass and many bolts 4 which pass through this hole and bind the H-shaped members. For this reason, this joint structure is a simple structure and becomes a powerful joint for pulling and bending. As the H-shaped member, H-shape steel which is a standardized product may be used, or a plate and a member having T-character cross section may be used in accordance with the strength of a joint. Consequently, it is possible to improve the strength and correspond to severe conditions by providing the joint of the segment and a structure which uses the H-shaped member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular steel segment for lining the inside of a shield tunnel and supporting an earth pressure in the technical field of civil engineering of a shield tunnel, and more particularly to a joint structure thereof.

[0002]

2. Description of the Related Art In recent years, when constructing subways, underground passages, submarine tunnels, and the like, shield construction methods using machines that excavate underground and proceed are increasing. In the conventional shield method, as shown in FIG. 11, a tunnel 52 of an underground 51 is excavated into a circular cross section, an arc-shaped steel shell ring 53 is assembled into a cylindrical shape on the inner surface thereof, and then lining is performed. A tunnel 54 having a cross section was formed, through which a road and a railway were passed. In this case, a circular half-moon-shaped portion must be excavated more than the cross section of the completed tunnel 54, which is uneconomical. Therefore, recently, as shown in FIG.
A rectangular shield tunnel method has been developed in which a tunnel 55 having a rectangular section is excavated from the beginning into the underground 51 using a steel shell ring 56 adapted to the section of the tunnel.

In a conventional segment, as shown in FIG. 11, an arcuate steel shell ring 53 is combined to form a circular cross section. Therefore, only a compressive force acts on the segment member by an arch action. Steel shell ring 5 forming a rectangular cross section shown in FIG.
In 6, the bottom plate, side plate and upper plate are subjected to bending and tension by earth pressure and water pressure, and the stress is larger than the conventional one.
In the conventional segment, there was a problem that the strength of the joint portion was particularly insufficient. FIG. 13 shows an example in which rectangular segments are assembled. In this example, corner segment 6
1, 63, bottom plate segment 64, side plate segment 6
3 and upper plate segments 61, 65 and 66, and the cross section of each member is, as shown in FIG. 14, a channel steel 72 at the edge and an H-shaped steel 71 at the center as a frame member. ,
It is connected by a skin plate 74 and has a built-in vertical rib 73. These segments are connected to each other by a joint 67 having a plate structure. In this example, a tension column 68 is used in the steel shell ring 56. The proof stress of the segments is exerted by the bending and axial forces of the H-section steel 71 and the channel steel 72 connected to the circumferential surface. In the joint portion of the segment, the force of the H-section steel 71 or the channel 72 is once transmitted to the end plates of the joint 67, and the end plates are connected to adjacent segments by bolts, and the force is applied to the end portions. H of adjacent segments through plates
Transmitted to shaped steel and channel steel. In the case of a rectangular segment, a strong force acts on the joint portion, so that the strength of the conventional end plate is insufficient. That is, since the joint 67 of such a segment causes bending or tension, it is necessary to use a joint having a higher strength than a conventional arc-shaped segment subjected to only compression.

Japanese Unexamined Patent Publication (Kokai) No. 6-235299 discloses a joint using an H-shaped steel as a joint structure for improving the waterproof performance and the workability at the connecting portion of such segments. This structure exhibits characteristics superior to those of the plate structure in terms of the strength of the joint. However, the web of the H-section steel attached to the joint portion of the segment is joined by bolts, and a joint structure that is stronger against tension and bending of the joint portion is desired.

[0005]

SUMMARY OF THE INVENTION The present invention provides a structure of a rectangular segment used for a newly developed rectangular shield tunneling method, particularly a joint structure thereof. The problem to be solved is to make the structure of the joint portion, which has insufficient strength in the conventional segment, a structure having sufficient strength.

[0006]

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems. An H-shaped member which is attached to an end joint portion of a segment and whose flange surfaces are in contact with each other is provided. It is a rectangular steel segment, characterized in that the joint portion is provided with a connecting bolt that penetrates four flanges of the member and fastens each other. As the H-shaped member, not only a standard H-shaped steel but also an H-shaped member formed of a plate and a member having a T-shaped cross section may be used according to the required strength.

Further, as another joint structure of the present invention, a joint plate attached to the back plate side of the end joint portion of the segment, the plate surfaces of which are in contact with each other and bolted together, and the end portion of the frame member of the segment from both sides. A rectangular steel segment comprising a joint consisting of a gusset plate to be pinched by a bolt.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are three views showing the joint structure of the embodiment. FIG. 1 is a plan view of the joint portion, FIG. 2 is a view along arrow AA, and FIG. 3 is a view along arrow BB. H-shaped members 2 are attached to the ends of the adjacent segments 1a and 1b, respectively.
a, 2b are attached, and these H-shaped members 2a,
2b is mounted so that the flanges 3, 3 abut against the outer surfaces of the adjacent H-shaped members. And
The H-shaped members 2a and 2b are provided with holes 5 penetrating four flanges, and are provided with a large number of bolts 4 that pass through the holes 5 and bind the H-shaped members. Therefore, this joint structure has a simple structure and is a strong joint against tension and bending. As the H-shaped member, a standard H-shaped steel may be used, or a composite member formed by combining a plate and a member having a T-shaped cross section, for example, a cut T according to the joint strength, may be used. If used, the thickness and web height can be freely changed. Since the H-shaped member has higher rigidity than the plate, it can be applied to a rectangular shield construction method that cannot be applied with the conventional plate structure.

Next, FIGS. 4 to 7 show channel members 11 and H-shaped members 12 which are frame members of adjacent segments 1a and 1b.
Are directly fastened by the attachment plates 21, 22, 23, 24. FIG. 4 is a plan view of the joint, and FIG.
6 is a side view of the joint portion of the channel steel 11 taken along the arrow D-D in FIG. 6, and FIG. 7 is a view taken along the line EE in FIG.
It is a side view of the joint part of. In the joint having this structure, the axial strength of the segments is directly transmitted from the shaped steel as the frame member to the shaped steel without passing through the end plate, so that the joint strength is remarkably improved.

FIG. 8 shows a comparison between the strength of a conventional joint and the strength of the joint according to the present invention. Take the joint extension on the horizontal axis,
The vertical axis indicates the tensile force acting on the joint. Curve 31
Indicates the characteristics of the base material. Compared to the joint having the conventional plate structure shown by the curve 35, an H-shaped member using a cut T and a plate at the end (curve 34), an H-shaped steel (curve 33), and an attachment It can be seen that the one joined by the plate (curve 32) clearly has a higher strength.

FIG. 9 is a graph showing the relationship between the load and the amount of deformation when the equally distributed load 41 is applied to the segment 1 having various joints as shown in FIG. The amount of deformation was calculated as a span 42 (435 mm) fixed beam at both ends using the main girder as a fulcrum. That is, the deformation amount S (mm) is as follows: S = (wL ⁴ ) / 384 · E · I w = Equally distributed load kg / cm L = Span cm E = Young's modulus kg / mm ² I = Second moment of area cm ⁴ Curve 36 is H-112 × 200 × 8 × 12, curve 37 is □ −200 × 100 × 9, and curve 38 is [−200 × 9
0 × 8 × 13.5, curve 39 is PL-200 × 25t
It is. It is shown that the bending rigidity of the H-section steel is remarkably large.

[0012]

According to the present invention, the joints of the segments, which have been regarded as problematic in the development of the rectangular shield tunnel, have a structure using an H-shaped member or a structure using an attachment plate to improve the strength. Then, it became possible to cope with severe conditions.

[Brief description of the drawings]

FIG. 1 is a plan view of a joint according to an embodiment.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a plan view showing an attachment plate joint of the embodiment.

FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;

FIG. 6 is a view as seen from the direction of the arrow DD in FIG. 4;

FIG. 7 is a view as seen from the direction of arrows EE in FIG. 4;

FIG. 8 is a graph showing the effect of the present invention.

FIG. 9 is a graph showing the bending stiffness of various joints.

FIG. 10 is an explanatory diagram of the bending in FIG. 9;

FIG. 11 is an explanatory view of a conventional shield tunnel method.

FIG. 12 is an explanatory view of a rectangular shield tunnel method.

FIG. 13 is an assembly view of a segment of a rectangular shield tunnel.

FIG. 14 is a sectional view of a segment of a rectangular shield tunnel.

[Explanation of symbols]

 1a, 1b Segment 2a, 2b H-shaped member 3 Flange 4 Bolt 5 Hole 11 Channel steel 12 H-shaped steel 13 Skin plate 21, 22, 23, 24 Attached plate 25 Joint plate 31, 32, 33, 34, 35 Curve 51 basement 52, 54, 55 tunnel 53, 56 steel shell ring 60 segment 61, 62 segment (corner) 63 segment (side plate) 64 segment (bottom plate) 65, 66 segment (upper plate) 67 joint part 68 jointed column 68 70 segment 71 H-section steel 72 Channel steel 73 Vertical rib 74 Skin plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makoto Ukegawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Corporation (72) Inventor Toru Taniguchi 1-7-1 Kyobashi, Chuo-ku, Tokyo (72) Inventor Mitsuru Shinohara 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda-ken Corporation (72) Inventor Hiroshi Yonezawa 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Inside (72) Inventor Hiroyuki Imashio 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corp. (72) Keisuke Shiota 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Inside the corporation

Claims (4)

[Claims] 1. An H-shaped member which is attached to an end joint portion of a segment and whose flange surfaces are in contact with each other, and a connecting bolt which penetrates four flanges of the H-shaped member and fastens each other, is provided in the joint portion. A rectangular steel segment, characterized in that: 2. The rectangular steel segment according to claim 1, wherein said H-shaped member is an H-shaped steel. 3. The rectangular steel segment according to claim 1, wherein the H-shaped member is an H-shaped member formed by a plate and a member having a T-shaped cross section. 4. A joint plate attached to the back plate side of the end joint portion of the segment, the plate surfaces of which are in contact with each other and bolted together, and an attachment plate which sandwiches the ends of the frame member of the segment from both sides and binds the bolt. A rectangular steel segment comprising a joint made of: