JPH06280498A - Structure of joining steel segments - Google Patents

Abstract

PURPOSE:To make it possible to greatly reduce joint work of steel segments so that structure of joining the steel segments has sufficient shear strength. CONSTITUTION:Steel segments 1 constituted of a curved skin plate 2 and a pair of main girders 3 and 4 fixed along the curved direction and arranged in parallel with each other are connected lengthwise by butting their main girders each other. A recessed gutter 6 is formed in parallel with the curved direction on the external side 3a of the connected main girder 3 of one steel segment 1. A projection thread fitted in the recessed gutter 6 is formed in parallel with the curved direction on the external side of the main girder of the other steel segment opposed to the main girder 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of steel segments for joining a plurality of arc-shaped plate-shaped steel segments which are joined to each other to form a cylindrical tunnel wall body to each other in the width direction.

[0002]

2. Description of the Related Art A recent tunnel construction method is a so-called shield construction method in which a cylindrical tunnel wall is constructed by sequentially joining arc plate-shaped segments behind the ground while excavating the ground by a shield machine. It is becoming more common.

As an example of the segment member used, a skin plate formed by bending a steel plate, and a pair of steel main girders fixed to each other while being fixed along the bending direction of the skin plate and facing each other. There is a steel segment whose components are and. The main girder of this steel segment is provided with a plurality of insertion holes used for bolting to adjacent steel segments.

In order to join a plurality of steel segments having the above-described structure along the width direction, the bolt insertion holes of the main girders of adjacent steel segments that are butted to each other are made to correspond to each other, and the bolt insertion holes are connected to the bolt insertion holes. By inserting the fastening bolts and fastening them with nuts, the steel segments in the width direction are joined to each other, whereby a part of the cylindrical tunnel wall body is constructed.

[0005]

By the way, in joining the steel segments by the bolt fastening means, the bolt through holes formed in the main girders are made to correspond to each other, the fastening bolts are inserted through the bolt through holes, and further tightened. Since the work of fastening the bolt and the nut has to be performed, it takes a lot of time and labor, and there is a problem in terms of construction period and construction cost.
In addition, the joint between the steel segments may receive shearing force from the earth wall of the excavated portion, but with the bolt fastening means of the prior art, it is only possible to increase the bolt diameter in order to resist the shearing force. However, there is concern about the shear strength, and there is an urgent need to develop a new joint structure that provides sufficient shear strength.

The present invention has been made in view of the above circumstances and provides a joining structure for steel segments which can significantly reduce the joining work between steel segments and has sufficient shear strength. It is intended to be provided.

[0007]

According to a first aspect of the present invention, there is provided a joining structure for steel segments, comprising: a curved skin plate; and a skin plate fixed along the bending direction of the skin plate and opposed to each other. Steel segments having a pair of main girders as constituent members are arranged along the circumferential direction,
A joining structure of steel segments that join together main girders of each other, and on the outer surface of the main girder to which one steel segment is joined, a groove is formed along the bending direction, On the outer surface of the main girder of the other steel segment facing the main girder, a convex strip that fits into the concave groove is formed along the curving direction.

Further, in the steel segment joining structure according to the second aspect, a receiving plate protruding outward in the width direction of the main girder is fixed to the lower end portion of the main girder to which one steel segment is joined. In addition, the main girder of the other steel segment facing the main girder is mounted on the receiving plate.

[0009]

According to the joining structure of steel segments of the present invention,
Compared with the joining structure using the bolt fastening means of the prior art, since the work of dealing with the bolt insertion holes, the fastening work of fastening bolts and nuts, etc. are eliminated, the joining work is greatly simplified, and the construction period and construction The cost can be significantly improved.

According to the joining structure of steel segments of the first aspect, the concave groove of one main girder and the ridge of the other main girder in which the steel segments are butted against each other are securely fitted. Since it becomes an integrated structure, the resistance against shearing force received from the earth wall of the excavated portion becomes large, and the joint strength between the steel segments can be improved.

According to the steel segment joining structure of the second aspect, the other main girder is placed on the receiving plate welded and fixed to one main girder with which the steel segments are butted. Therefore, the resistance against the shearing force received from the soil wall of the excavated portion becomes large, and therefore the joint strength between the steel segments can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

The steel segment 1 of this embodiment comprises a steel skin plate 2 having a predetermined radius of curvature and a pair of steel main plates fixed inside the skin plate 2 so as to face each other in the width direction. An arc composed of the beams 3 and 4 and a pair of steel end plates 5 fixed to both ends of the skin plate 2 in the bending direction (only one end is fixed in FIG. 1). It is a plate-shaped member.

The pair of main girders 3 and 4 are arranged in parallel with each other at a distance from each other, but a concave groove 6 is formed in the central portion of the outer surface 3a of one of the main girders 3 continuously in the bending direction. ing. A ridge 7 is continuously formed in the bending direction at the center of the outer surface 4a of the other main girder 4. The ridges 7 are formed in substantially the same shape as the internal space of the concave groove 6 formed in the main girder 3.

Next, the steel segment 1 (1
a, 1b ...) are joined to each other in the width direction by
As shown in FIG. 1, the ridges 7 of the main girder 4 of the other steel segment 1c are provided in the concave grooves 6 of the main girder 3 of the one steel segment 1b.
I will fit in. Also, the main girder 3 of the steel segment 1c
The ridge 7 of the main girder 4 of the other steel segment 1d is fitted into the concave groove 6 of the other. Thus, the steel segment 1
The a, 1b, ... Are joined in the width direction in a fitted state to form a part of the tunnel wall body.

Therefore, the steel segment 1 having the above structure
When is used as a structural member of the wall of the tunnel, compared with the joining structure using the bolt fastening means of the prior art, the work of dealing with the bolt insertion holes, the fastening work of fastening bolts, nuts, etc. are eliminated, so the joining work It is possible to greatly simplify the construction, and thereby the construction period and construction cost can be greatly improved.

Further, in the joint structure of the present embodiment, when a shearing force from the earth wall of the excavated portion is applied to the joint between the steel segments 1b and 1c (in FIG. 2, shearing force is applied downward from above the joint). Force), steel segments 1b, 1
Since the concave groove 6 and the convex ridge 7 of c are securely fitted in a surface contact state, and the steel segments 1b and 1c are integrated with each other, the resistance to shearing force becomes large,
Sufficient shear strength can be obtained as compared with the conventional bolt fastening means.

FIG. 3 shows another embodiment of the ridges 7 formed on the main girder 4 of this embodiment. A ridge 8 formed as a separate member is formed on the outer surface 4a of the main girder 4. The one fixed by welding is shown. Further, FIG. 4 shows another embodiment of this embodiment, in which the main girder 3 is provided with a plurality of concave grooves 6a, 6 along the bending direction.
b is formed, and also on the outer side surface 4a of the main girder 4, the ridges 7 are fitted in the concave grooves 6a and 6b, respectively.
a and 7b are formed.

Next, a second embodiment of the steel segment joining structure of the present invention will be described with reference to FIGS. The same components as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted.

In the steel segment 10 of this embodiment, of the pair of steel main girders 11 and 12 of the same height T, which are arranged to face each other inside the skin plate 2, only one of the main girders 11 has a receiving plate. 13 is welded and fixed. That is, the receiving plate 13 is arranged orthogonal to the outer side surface 11a, and is welded and fixed to the lower end portion of the main girder 11 so as to protrude outward in the width direction of the main girder 11 by a predetermined width H. The receiving plate 13 is continuously provided along the main girder 11.

The steel segments 10 ... (10
a, 10b ...) are joined to each other in the width direction, as shown in FIG. 6, while the outer surfaces 11a, 12a of the steel segments 10b are abutted on each other on the receiving plate 13 of the other steel segment 10b, Girder 1 of steel segment 10c
Place 2 on top. Further, the main girder 12 of the other steel segment 10d is placed on the receiving plate 13 of the steel segment 10c. Thus, the steel segment 1
0a, 10b, ... Are joined in the width direction while the skin plate 2 is flush with each other, and a part of the tunnel wall body is formed.

When the steel segment 10 having the above-mentioned structure is used as a constituent member of a wall of a tunnel, the steel segment 10 shown in FIGS.
Similar to the first embodiment shown in FIG. 3, the joining work can be greatly simplified, and thus the construction period and construction cost can be greatly improved.

Further, in the joint structure of this embodiment, when a shearing force is applied to the joint between the steel segments 10b and 10c from the earth wall of the excavation (in FIG. 6, the shearing force is directed downward from above the joint. Steel segment 10b
The receiving plate 13 of the main segment 1 of the steel segment 10c.
Since 2 is reliably received, sufficient shear strength can be obtained as compared with the conventional bolt fastening means.

1 to 6 according to the present invention, only those provided with the concave groove 6, the convex strip 7 and the receiving plate 13 are shown, but this is not intended to limit the scope of the present invention. Even more preferable joining is possible by drilling a minimum required bolt insertion hole at a predetermined position of the main girders 3, 4, 11, 12 and using the bolt insertion hole to combine an auxiliary joining structure with fastening bolts and nuts. The structure can be obtained.

[0025]

The joint structure of the steel segment according to claim 1 of the present invention is capable of significantly simplifying the joint work to significantly improve the construction period and construction cost, and the steel segment. Since the concave groove of one main girder and the ridge of the other main girder that are butted against each other are securely fitted into each other to form an integrated structure, the resistance against the shearing force received from the earth wall of the excavation becomes large, Therefore, the joint strength between the steel segments can be improved.

Further, in the joint structure of the steel segment according to claim 2, the joint work can be greatly simplified similarly to the joint structure according to claim 1, and the construction period and construction cost can be greatly improved. In addition, since the other main girder is placed on the receiving plate welded and fixed to the one main girder where the steel segments are butted against each other, the resistance to the shearing force received from the earth wall of the excavation is large. Therefore, it is possible to improve the joint strength between the steel segments.

[Brief description of drawings]

FIG. 1 is a perspective view showing a steel segment according to claim 1 of the present invention.

FIG. 2 is a sectional view of an essential part showing the joint structure of the steel segment according to claim 1 of the present invention.

FIG. 3 is another embodiment of the ridge of the steel segment according to claim 1 of the present invention.

FIG. 4 is another embodiment of the groove and the ridge of the steel segment according to claim 1 of the present invention.

FIG. 5 is a perspective view showing a steel segment according to claim 2 of the present invention.

FIG. 6 is a cross-sectional view of an essential part showing the joining structure of the steel segment according to claim 2 of the present invention.

[Explanation of symbols]

 1, 1a, 1b, 1c Steel segment 2 Skin plate 3, 4 Main girder 3a, 4a Outer surface of main girder 6 Recessed groove 7 Convex ridge 10, 10a, 10b, 1c Steel segment 11, 12 Main girder 11a, 12a Outer surface of main girder 13 Support plate

Claims (2)

[Claims] 1. Steel segments each having a curved skin plate and a pair of main girders fixed along the bending direction of the skin plate and arranged to face each other, as members, It is a joint structure of steel segments in which girders are butted and joined in the width direction, and a groove is formed along the bending direction on the outer surface of the main girder to which one steel segment is joined. Along with the main girder, an outer surface of the main girder of the other steel segment facing the main girder is formed with a ridge that fits in the groove along the bending direction. Joint structure. 2. Steel segments each having a curved skin plate and a pair of main girders fixed along the bending direction of the skin plate and arranged to face each other as constituent members A joint structure of steel segments in which girders are butted and joined in the width direction, and a receiving plate protruding outward in the width direction of the main girder is attached to the lower end of the main girder to which one steel segment is joined. Is fixed, and the main girder of the other steel segment facing the main girder is placed on the receiving plate.