JPH08312295A - Segment joint and connected structure of segment - Google Patents

Abstract

PURPOSE: To enable mechanization of assembly of segments, to provide good assembling accuracy, and to enhance the efficiency of joints of the segments. CONSTITUTION: This segment joint comprises a flange 22 projected from one of the opposite end faces of adjacent segments 10, 10, another flange 22 projected from the other end face 22, and a pin 24 for connecting these flanges 22, 22 together. A through hole 22a is formed in each flange 22, 22, with the axis of each through hole 22a overlapping with a surface parallel to the end faces. The pin 24 is passed through the through hole 22a in each flange 22, 22. The pin 24 may be tapered and time diameter of the through hole 22a in each flange 22, 22 may be equal to the diameter of the mating position of the pin 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment joint for connecting segments forming inner walls of tunnels such as subways, roads, water and sewage systems, electric power, communication paths, and common grooves, and a segment using this segment joint. Related to the connection structure of.

[0002]

2. Description of the Related Art FIG. 9 is a partial perspective view of an example of a tunnel formed by using a conventional segment joint. As shown in the figure, the tunnel 2 comprises a large number of segments 10 connected in a cylindrical shape. The segments 10 are connected in a zigzag manner so that portions having low strength are not continuously formed on a straight line by forming segment joints continuously on a straight line.

FIG. 10 is a partially enlarged view of FIG. 9, and FIG. 11 is FIG.
It is an AA arrow sectional view of 0. As shown in these figures, the segment 10 is made of a rectangular reinforced concrete plate having a predetermined thickness, and this reinforced concrete plate is curved in an arc shape so as to form a part of the tunnel 2.

Joint plates 12 made of steel plates are integrally provided at respective ends of the four circumferences of the segment 10 at predetermined intervals, and through holes 12a are formed in the joint plate 12. Joint plate 12
Is provided at a position where adjacent segments 10 and 10 overlap each other when the segment 10 is assembled into a tubular shape, and the through hole 12a is provided at a position where the overlapping joint plates 12 and 12 communicate with each other.

A core box 14 formed of a substantially box-shaped recess is provided in the segment 10 adjacent to the inside of the joint plate 12. The inside of the core box 14 has a space large enough to accommodate the bolts and nuts 16a and 16b and fasten them inside.

The segment 10 is assembled inside the tunnel 2 with a waterproof seal (not shown) sandwiched between them, and a bolt 16a is inserted into the core box 14 on one side of the joint plates 12 and 12 from the inside. The threaded portion is passed through the through hole 12a of the joint plate 12, the nut 16b is inserted into the other core box 14 of the joint plate 12, 12, and the nut 16b is screwed into the threaded portion of the bolt 16a and is tightened to be connected and integrated. be able to.

[0007]

By the way, among the above-mentioned conventional segment joints, the above-mentioned segment is
When assembling the segment 10, the narrow core box 1
Since the bolts and nuts 16a and 16b must be fastened in Section 4, fastening work is very troublesome and automation (mechanization) thereof is difficult.

FIG. 12 is a perspective view of the segment proposed prior to this application. In this segment 10, a plurality of strip-shaped main steel materials 18 are arranged inside in the longitudinal direction. In addition, projections such as striped projections are provided on the surface of the main steel material in order to increase adhesion to concrete (not shown).

This segment 10 has a plurality of strip-shaped main steel materials 18 arranged in the longitudinal direction, so that
It has the advantage of dramatically improving strength and rigidity in the longitudinal direction.

However, since the structure of this segment joint for connecting the segments 10 is the same as the conventional one, the strength of the joint portion is relatively lower than that of the main body, and there is a problem that the joint efficiency is poor.

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a segment joint which enables mechanization of segment assembly, has high assembly accuracy, and has high segment joint efficiency. And

[0012]

SUMMARY OF THE INVENTION A segment joint for solving the above-mentioned problems is provided with a flange projecting from one of the facing end surfaces of adjacent segments and a projecting projection from the other end surface. And a pin connecting these flanges, each of which has a through hole formed therein, and the central axis of each of the through holes overlaps with a surface parallel to the end face. Is inserted into the through hole of each flange.

Here, the pin may be tapered, and the diameter of the through hole of each flange may be the same as the diameter of the fitting position of the pin.

Further, the through holes of the respective flanges are provided so that the central axes thereof are substantially perpendicular to the front and back surfaces of the respective segments, and the vicinity of the portion of the segment where the respective flanges are projected is provided in the segment. You may make it a recessed part opened to the back surface side.

Further, the flanges may be provided on the end surfaces of the segments facing each other, and the through holes of the flanges may be provided so as to overlap in the ring-to-ring direction of the segment (axial direction of the tunnel).

Further, the flanges may be provided on the end surfaces of the segments facing each other between the rings, and the through holes of the flanges may be provided so as to overlap in the direction between the pieces of the segment (the circumferential direction of the tunnel).

Further, a strip-shaped main steel material may be arranged in the inside of the segment in the longitudinal direction, and the flange may be connected to the end portion of the main steel material directly or through another member.

[0018]

According to the invention described in claims 1 to 5, the flanges are provided so as to protrude from the end faces of the adjacent segments, and the through hole is provided so that the central axis of the through hole overlaps the face parallel to the end face. When a pulling force acts between adjacent segments between pieces and a pulling force acts on the segment joint, the segment joint does not separate until the pin is shear fractured.

According to the second aspect of the present invention, since the pin is tapered and the diameter of the through hole of each flange is the same as the diameter of the fitting position of the pin, the pin is inserted into the through hole of each flange. , The pins are brought into close contact with the through holes of the flange.

According to a third aspect of the present invention, the through holes of the respective flanges are provided so that their central axes are substantially perpendicular to the front and back surfaces of the respective segments, and the respective flanges of the segments are provided in a protruding manner. Since the recess near the part is opened to the rear surface side of the segment, the pin can be inserted from the inside of the tunnel.

Further, in the invention according to claim 4, the flanges are provided on the end faces facing each other between the pieces of the segments, and the through holes of the flanges are provided so as to overlap in the ring-to-ring direction of the segment. When the pin is inserted into the through hole in the axial direction of the tunnel (inter-ring direction of the segment), all the segment joints on the end face are connected at once.

Further, in the invention according to claim 5, the flanges are provided on the end faces facing each other between the rings of the segments, and the through holes of the flanges are provided so as to overlap in the direction between the pieces of the segment. When the curved pin is inserted into the through hole of the tunnel in the circumferential direction of the tunnel (the direction between the pieces of the segment), all the segment joints on the end face are connected at once.

Further, in the invention according to claim 6, a strip-shaped main steel material is arranged inside the segment in the longitudinal direction, and each of the flanges is directly or through another member at an end portion of the main steel material. Since they are connected to each other, there is no reduction in strength at the joint.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial perspective view of a segment provided with a segment joint according to an embodiment of the present invention, and FIG. 2 is A of FIG.
FIG. 3 is a sectional view of the segment joint in a connected state.

As shown in these drawings, two or more sets of segment joints 20 and 20 are provided on the end faces of the adjacent segments 10 and 10 facing each other so as to face each other and between the rings. Of course, depending on the case, one set may be used, only between the pieces, or between the rings. If this segment joint 20 is used both between the pieces and between the rings, automatic assembly becomes easier.

The segment joint 20 is composed of three flanges 22 each having a through hole 22a, and one pin 24 which is fitted in each of the through holes 22a to connect these flanges 22 together.

Two of the three flanges 22 are projected on the end surface of one segment 10 with one flange open, and the remaining one is projected on the end surface of the other segment 10. A nut 26 is welded to the flange 22 near the outside of the segment 10 out of the two flanges 22, 22 coaxially with the through hole 22a.

It should be noted that one flange 22 is provided on each of the end faces of two adjacent segments 10 and a total of two flanges 2 are provided.
It may be composed of two.

The base end of the flange 22 is a plate-shaped connecting steel material 2
8 and the connecting steel material 28 is welded to the plate-shaped main steel material 18. The main steel material 18 is made of a steel plate with protrusions and is embedded in the segment 10 in the longitudinal direction.

The through hole 22a formed in the flange 22 is provided so that its central axis is oriented substantially at right angles to the front and back surfaces of the segment 10. The pin 24 is provided with a taper, and a screw is formed at the tip. The diameter of the through hole 22a of each flange 22 is the same as the diameter of the fitting position of the pin 24.

In the vicinity of the portion of the segment 10 where each flange 22 is provided, a recess 30 is formed so as to open to the end face side and the back face side of the segment 10.

FIG. 4 is a sectional view of the segment joint before connection. The segment joint 20 described above can be arranged as shown in this figure, and the segments 10 can be connected as follows.

That is, first, the end surface of one segment 10 is brought into contact with the end surface of another segment 10. As a result, the flange 22 of the other segment 10 is inserted between the flange 22 of the one segment 10 and at the same time the flanges 22 and 2 are formed by the recesses 30 and 30.
A box is formed so as to surround 2 and open toward the inside of the tunnel 2.

Next, the pin 24 is inserted from the inside of the tunnel 2 through the box into the through hole 22a of the flange 22 by an automatic machine, and is slightly rotated. As a result, the pin 24 comes into close contact with the respective through holes 22a of the flange 22, and at the same time, the tip of the pin 24 is fixed to the nut 26 attached to the flange 22.

Finally, mortar or the like is poured into the inside of the box formed by the recesses 30, 30. The segment joint 20 is buried inside the segment by mortar or the like.

When a pulling force acts between the adjacent segments 10 and 10 connected in this way and a pulling force acts on the segment joint 20, the flanges 22 and 22 do not separate until the pin 24 is sheared and broken. .

FIG. 5 is a sectional view of a segment joint according to another embodiment of the present invention. In this embodiment, the segment joint 20 is composed of four flanges 22 and one pin 24, and two flanges 22 are projectingly provided on the end faces of the adjacent segments 10 which are opposed to each other. The segment joint 20 of this example is suitable for the segment 10 having a large girder height.

FIG. 6 is a partial perspective view of a segment joint according to still another embodiment of the present invention. In this example, the flanges 22 are projectingly provided on the end faces of the segments 10 which face each other, and the through holes 22 of the flanges 22 are provided.
The a is provided so that the center line thereof faces the inter-ring direction of the segment 10.

In the case of the segment joint of this example, as shown in FIG. 7, the adjacent segments 10 are made to face each other between the pieces, and as shown in FIG. The segment 10 can be connected by inserting the pin 24 into the through hole 22a in the axial direction of the tunnel 2.

When the segment joint 20 has the structure of this example, there is no possibility that the pin 24 will fall out. In addition, a plurality of segment joints 20 can be simultaneously connected with one pin 24.

[0041]

According to the present invention, when a force in the direction of separating between the adjacent segments acts and a force in the direction of separating between the flanges of the segment joint acts, each flange exerts an extremely large shear resistance by the pin. Since it is received, there is an effect that the connection strength of the segment joint becomes significantly larger than that in the case of bolt connection.

According to the second aspect of the invention, when the pin is inserted into the through hole of each flange, the pin is closely attached to each through hole of the flange and the flanges are not displaced from each other. This has the effect of increasing accuracy.

Further, according to the third aspect of the present invention, the segments can be connected only by inserting the pin from the inside of the tunnel, so that the segments can be automatically assembled and the construction period of the segment is significantly shortened. There is an effect that is done.

Further, according to the invention described in claim 4, when the pin is inserted into the through hole of the flange in the axial direction of the tunnel, all the segment joints of the end face are connected at once, so that the connecting work is easy. Has the effect of becoming.

Further, according to the invention of claim 5, when the pin is inserted into the through hole of the flange in the circumferential direction of the tunnel, all the segment joints of the end face are connected at one time, so that the connecting work can be performed. It has the effect of making it easier.

Further, according to the invention described in claim 6, since there is no decrease in strength at the joint portion, there is an effect that the joint efficiency is improved.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a segment including a segment joint according to an embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is a cross-sectional view of the segment joint in a connected state.

FIG. 4 is a cross-sectional view of the segment joint before connection.

FIG. 5 is a cross-sectional view of a segment joint according to another embodiment of the present invention.

FIG. 6 is a partial perspective view of a segment joint according to still another embodiment of the present invention.

FIG. 7 is a partial plan view showing a state of a segment including the segment joint of the example of FIG. 6 before connection.

FIG. 8 is a partial plan view showing a state after the segments having the segment joint of the example of FIG. 6 are connected.

FIG. 9 is a partial perspective view of a tunnel formed using a conventional segment joint.

10 is a partially enlarged view of FIG. 9. FIG.

11 is a cross-sectional view taken along the line AA of FIG.

FIG. 12 is a partially cutaway perspective view of another example of the conventional segment.

[Explanation of symbols]

 10 segment 18 main steel material 20 segment joint 22 flange 22a through hole 24 pin 26 nut 28 connecting steel material 30 recess

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Nagayama 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (6)

[Claims] 1. A flange projecting from one of the facing end surfaces of adjacent segments, a flange projecting from the other end surface, and a pin connecting these flanges, A through hole is formed in each of the flanges, a central axis of each of the through holes overlaps with a surface parallel to the end surface, and the pin is inserted into the through hole of each of the flanges. Characteristic segment joint. 2. The segment joint according to claim 1, wherein the pin is tapered and the diameter of the through hole of each flange is the same as the diameter of the fitting position of the pin. 3. The through holes of each of the flanges are provided so that their central axes are substantially perpendicular to the front and back surfaces of each of the segments, and the vicinity of a portion of each of the segments where each of the flanges projects is provided in the segment. The segment joint according to claim 1 or 2, wherein the recess is formed so as to open to the back surface side. 4. The flanges are provided on end faces of the segments that face each other between the pieces, and the through holes of the flanges are provided so as to overlap in the ring-to-ring direction of the segments. The described segment fitting. 5. The flanges are provided on end faces of the segments that face each other between the rings, and the through holes of the flanges are provided so as to overlap in the direction between the pieces of the segment. The described segment fitting. 6. A strip-shaped main steel material is arranged inside the segment in the longitudinal direction, and each of the flanges is connected to an end portion of the main steel material directly or through another member. Structure of connecting segments.