JPH09177495A - Joint structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make joint structure of a segment simple and certain so as to be favourable for automatic assembly. SOLUTION: A first coupler plate 10 having a coupler pin 13 projected in the other jointed segment direction and a second joint plate 20 having a joint hole in which the joint pin 13 of the first joint plate 10 is fit are provided on a jointed surface 6 of a segment. A constricted part 13b is formed on an intermediate part of the joint pin 13 of the first joint plate 10. A lock plate 20c to engage with the joint pin 13 is provided as the joint pin 13 enters the constricted part 13b from a direction orthogonal with the inserting direction at the time when the joint pin 13 is inserted into the joint hole of the second joint plate 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a segment such as a segment for a tunnel wall body, which is joined to form a cylindrical tunnel wall body.

[0002]

2. Description of the Related Art A so-called shield construction method in which a cylindrical tunnel wall body is assembled by sequentially joining a large number of segments behind it while excavating a ground of a predetermined depth by a shield machine is not a mainstream tunnel construction method. I'm doing it. The segment is made of reinforced concrete, steel, etc., and its shape is generally an arc plate block that is a curved flat plate, and as a joint structure that connects adjacent ones, There is a method in which joint plates buried along the end face are fastened with bolts, or segments are directly fastened with long bolts penetrating the segments.

[0003]

By the way, it is general that segments are usually joined together by bolts to be assembled. For this bolt joint, install bolts and nuts
For the fastening work, it is necessary to form a so-called bolt box on the inner surface side of the segment so as to remove the box, but when this bolt box is formed, there is a problem that the strength of the segment is reduced. Further, recently, automation of assembly by a robot or the like has been progressing, but at the time of this automation, positioning and fastening work of segments is the most difficult work.

The present invention has been made in view of the above circumstances, and it is possible to assemble a ring having high rigidity without lowering the strength of the segment, and to simplify the positioning and fastening work in terms of construction, thereby improving the construction accuracy. It is an object of the present invention to provide a joint structure for a segment, which can improve safety, ensure safety, shorten assembly time, and facilitate automation.

[0005]

The present invention has been made to achieve the above object, and the joint structure of a segment according to claim 1 is joined in a state where the joining surfaces are in contact with each other. In a joint structure of a segment, a first joint portion having a joint pin protruding in a segment direction to be joined and the joint pin of the first joint portion are fitted to a joint surface of the segment. A second joint portion having a joint hole is formed, a constriction portion is formed in an intermediate portion of the joint pin of the first joint portion, and the joint hole of the second joint portion is formed. It is characterized in that a lock member is provided which, when the joint pin is inserted, enters the constricted portion and engages the joint pin. According to a second aspect of the present invention, there is provided the segment joint structure according to the first aspect, wherein the joint pin is detachably provided on the segment.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a segment that is joined to form a tubular tunnel wall body.
The segment 1 is made of reinforced concrete and is formed in an arc plate shape having a predetermined thickness. The segment 1 is formed by providing the projecting portions 3 through the transitional portions 4 from both circumferential end portions of the substantially hexagonal main body portion 2 which is long in the circumferential direction (vertical direction in FIG. 1). It has a symmetrical shape.
A ring 1A is configured by joining the joining surfaces 5 of the protrusions 3 and joining them in the circumferential direction, and a large number of rings 1A are joined to form a tubular wall body.

A first joint plate (first joint portion) 10 is provided on an axial joint surface 6 of the segment 1 on the protruding portion 3 side.
Is buried with its surface exposed. A second joint plate (second joint portion) 20 is embedded in the joint surface 6 on the main body 2 side. The first joint plate 10 is shown in FIGS. 2 and 3, and the second joint plate 20 is shown in FIGS. 4 to 6. The anchor bars 7 are connected by welding for the purpose of connection.

Joint pins 13 are provided on each of the first joint plates 10. The joint pin 13 is passed through a through hole 14 formed in the first joint plate 10 and screwed into a cap nut 15 welded to the back surface, whereby the joint pin 13 projects orthogonally from the joint surface 6. There is. Further, the joint pin 13 has a tapered portion 13a whose diameter gradually increases toward the rear end, and further has a constricted portion 13b formed to have a small diameter in the middle portion.

The second joint plate 20 is provided with a pair of joint holes 23 orthogonal to the joint surface 6 in the joint plate portion 20a which constitutes the second joint plate 20.
The joint pin 13 is inserted in the.
The intervals of these joint holes 23 are set to be the same as the intervals between the joint pins 13 in the state where the joint surfaces 5 of the segment 1 in the circumferential direction are butted against each other. That is, in the state where the joint surfaces 5 of the segments 1 are butted against each other,
The joint pins 13 are inserted into the joint holes 23, respectively. Second with the joint hole 23 formed as described above
The joint plate 20 includes a joint plate portion 20 a and the joint plate portion 20 a.
a holding member 20 having a recess 30 provided on the back side of a
b and a lock plate (lock member) 20c provided in the recess 30 of the holding member 20b, the lock plate 20c is movable in the thickness direction of the segment 1. An elastic material 31 made of spring steel or the like is provided on one side of the lock plate 20c between the side wall of the holding member 20b and the side wall of the recess 30. The hole portion 32 formed in the lock plate 20c is held in a position displaced from the joint hole 23 of the joint plate portion 20a. In addition,
The holding member 20b in which the recess 30 is formed has the same axis as the joint hole 23 formed in the joint plate portion 20a.
A hole portion 33 communicating with the joint hole 23 is formed.
The hole 33 is provided on the back side of the holding member 20b.
The bottomed cylindrical members 34 are respectively provided at the formation positions.

In order to construct the cylindrical tunnel wall body by assembling the above-mentioned segments 1, the adjacent protrusions 3 of the two segments 1 in which the joint surfaces 5 are aligned along the circumferential direction are arranged.
The body portion 2 of the other segment 1 is fitted into the recess 3A formed by the above, whereby the pair of adjacent joint pins 13 are inserted into the joint holes 23, respectively. In this way, the tapered portion 13 at the tip of the joint pin 13
a enters the joint hole 23, and the tapered portion 13
a enters into the hole 32 formed in the lock plate 20c. As a result, the axis of the hole 32 of the lock plate 20c is gradually brought closer to the axial direction of the joint hole 23 by the tapered portion 13a of the joint pin 13, whereby the lock plate 20
c is moved against the biasing force of the elastic member 31. further,
The joint pin 13 is pushed into the hole 33 of the holding member 20b.
When the constricted portion 13b of the joint pin 13 reaches the position where the lock plate 20c is arranged, as shown in FIG. 7, the lock plate 20c urged by the elastic member 31 is pushed in.
Enters the constricted portion 13b of the joint pin 13, the joint pin 13 is locked, and the joint pin 13 is prohibited from coming out of the joint hole 23. That is, these first joint plates 1
0 and the second joint plate 20 are engaged with each other, and the segments 1 are axially joined and connected by this engaging force to construct a tunnel wall body.

According to the joint structure of the above segment, the joint pins 23 provided in the projecting portions 3 of the segment 1 are fitted into the joint holes 23 provided in the main body portion 2 of the segment 1, so that the circumferential direction is increased. Two segments lined up in
Along with the mutual bonding, they are also bonded in the axial direction. That is, since the segments 1 arranged in the circumferential direction and the axial direction are joined to each other only by fitting the joint pin 13 into the joint hole 23 without using a bolt fastening means, the joining operation is simple but surely One piece can be joined, and as a result, it is extremely suitable for automatic assembly.

Further, the joint pin 13 is the first joint plate 10
Since it is detachable, if the joint pin 13 is not attached yet during transportation, stocking, etc., the protruding joint pin 13 does not get in the way, and the joint pin 13 is screwed in and attached at the site. By doing so, there is no risk of the joint pin 13 being damaged or bent.

[0013]

As described above, according to the segment joint structure of the present invention, the following effects can be obtained.
According to the segment joint structure of claim 1, the joint pin of the first joint portion provided on the joint surface of the segment is
The lock member provided in the joint hole is made to bite into the constricted portion of the joint pin by a simple operation such as insertion into the joint hole of the second joint portion provided on the joint surface of the segment to be joined. Due to the resultant force, it is possible to extremely easily and reliably join the segments, and as a result, it is extremely suitable for automatic assembly. According to the segment joint structure of claim 2, the joint pin can be removed during transportation, stocking, etc., so that the joint pin protruding does not get in the way, and the joint pin can be used on site. If the fitting pin is attached, it is possible to prevent the joint pin from being damaged or deformed.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a jointed structure of segments according to an embodiment of the present invention, showing a state in which a plurality of segments are joined.

FIG. 2 is a cross-sectional view of a first joint plate for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 3 is a front view of the first joint plate for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 4 is a sectional view of a second joint plate for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 5 is a front view of a second joint plate for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a second joint plate for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 7 is a transverse cross-sectional view of first and second joint plates joined to each other for explaining the joint structure of the segment according to the embodiment of the present invention.

[Description of Reference Signs] 1 segment 6 joining surface 10 first joint plate (first joint portion) 13 joint pin 13b constricted portion 20 second joint plate (second joint portion) 20c lock plate (lock member) 23 Joint hole

Front page continued (72) Inventor Yasuhiko Asai 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Toshihiro Okumura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd.

Claims (2)

[Claims] 1. A joint structure of a segment to be joined in a state where the joint surfaces are in contact with each other, wherein the joint surface of the segment has a joint pin protruding in the direction of the segment to be joined. And a second joint portion having a joint hole into which the joint pin of the first joint portion is fitted, and the joint pin of the first joint portion has an intermediate portion thereof. A constricted portion is formed, and a lock member is provided in the joint hole of the second joint portion, the lock member entering the constricted portion when the joint pin is inserted and engaging the joint pin. A joint structure of a segment characterized by the above. 2. The segment joint structure according to claim 1, wherein the joint pin is detachably attached to the segment.