JP2002121998A - Flexible coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible coupling device enabling a connection of a shield ring so as to absorb displacements caused by complex stresses, with simple structurally enabling construction at a low cost. SOLUTION: A male coupling 2 and female couplings 3A and 3B for connecting the shield ring are provided at the axial ends of segments 1A and 1B which constitute the shield ring. The male coupling 2 has bulged connecting heads 5a and 5b provided at both ends of a connecting rod 4. Each of the female couplings 3A and 3B includes a receiving cylinder 6 embedded into a segment 7 and being open to an opposite end face, with the connecting heads 5a and 5b of the male coupling 2 inserted into the receiving cylinder 6; a receptacle 7 for locking the heads 5a and 5b within the receiving cylinder 6; a spring 8 for urging the receptacle 7 in the direction of an opening; and a stop member 9 abutting against the ends of the heads 5a and 5b inserted in the cylinder 6, for limiting the range of invasion of the ends. At the connection between each of the heads 5a and 5b of the male coupling 2 and each of the female couplings 3A and 3B, movable ranges are provided along telescoping direction, shearing direction, twisting direction and bending direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint device for flexibly connecting a shield ring of a shield tunnel constructed by a shield method.

[0002]

2. Description of the Related Art To construct a shield tunnel by a shield method, a shield ring is formed by connecting a plurality of segments around a space formed every time a predetermined length is excavated by a shield machine, and an inner peripheral surface of the shield ring is formed. Is done by secondary lining with concrete.

[0003] The shield tunnel constructed in this manner avoids damage to the shield ring itself caused by displacement due to unequal subsidence in soft ground or complicated stress generated by an earthquake or the like, and secures its safety. To
It has been proposed to provide a flexible connecting means for absorbing the displacement due to the stress at predetermined intervals in the length direction of the shield tunnel.

Conventionally, as such a flexible connecting means, there is a flexible segment in which an elastic flexible ring is interposed between rigid main rings attached to a segment, and a middle ring is attached to the inner surface of the elastic flexible ring. (JP-A-9-18
No. 4398).

[0005]

However, the above-mentioned flexible segment has a problem that the structure is complicated, the construction is troublesome, and the cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible joint device capable of connecting a shield ring so as to absorb displacement caused by complicated stress, and having a simple structure and being constructed at low cost.

[0007]

According to one aspect of the present invention, there is provided a flexible coupling device for flexibly connecting shield rings composed of a plurality of segments, wherein the segment comprises a plurality of segments. At the axial end, a male joint and a female joint for connecting the shield ring are provided. In the male joint, connecting bulging heads are provided at both ends of a connecting rod having a predetermined length. In the female joint, a receiving cylinder body which is embedded and fixed in the segment and is opened at an axial end and into which a bulging head for connection of the male joint is inserted, A receptacle movably fitted and locked to the connecting bulging head inserted into the receiving cylinder to prevent the receptacle from coming off; a spring for urging the receptacle in an opening direction; and a spring inserted into the receiving cylinder. Expansion head for connection It has a structure provided with a stop member that abuts on the tip and regulates the invasion range of the connecting bulging head. In the connecting portion between the connecting bulging head of the male joint and the female joint, the direction of expansion and contraction, , A movable range is provided in each of the twisting direction and the bending direction.

[0008] With this configuration, the shield rings are connected to each other by inserting one connecting bulging head of the male joint into the female joint embedded and fixed in the segment forming one shield ring, and connecting the shield joint to the other of the male joint. The shield rings can be connected to each other by a simple operation such as inserting the connection bulging head into the female joint embedded and fixed in the segment constituting the other shield ring. And, at the connection portion between the connecting bulging head of the male joint and the female joint, a movable range is provided in each of the expansion / contraction direction, the shearing direction, the torsion direction, and the bending direction. When displacement occurs in the expansion and contraction direction, shear direction, torsion direction, bending direction, etc. in the shield ring due to settlement or earthquake, the movable range provided at the connection portion between the connecting bulging head and the female joint , Thereby preventing damage to the shield ring itself.

According to a second aspect of the present invention, in the first aspect, a tapered inner surface whose inner diameter gradually decreases toward an opening end is provided on an opening side of the receiving cylinder body of the female joint,
The receptacle has a tapered shape of the receiving cylinder body at a tip end outer surface side of a plurality of resilient pieces that rebound in a centripetal direction provided in a circumferential direction having a smaller diameter than the inner diameter of the receiving cylinder body on the opening side of the receiving cylinder body. The inner surface is provided with a taper sliding contact surface, and the inner surface side is provided with a chuck portion having a configuration in which a locking convex portion that locks to the connecting rod side of the connecting bulging head of the male joint is provided,
In the movable range of the connecting portion between the connecting bulging head of the male joint and the female joint, the male member and the female joint are connected, and the stop member of the female joint and the receptacle are resiliently moved. A space is provided between the projecting portion provided on the inner surface side of the distal end portion of the piece so that the connecting bulging head can move within a predetermined range in the axial direction. A predetermined gap is provided along the circumferential direction between the circumference and the connecting bulging head, and further connected to the inner circumference of the locking convex portion provided on the inner surface of the distal end portion of the resilient piece of the receptacle. Between the rod,
It is characterized by being formed by having a predetermined gap along the circumferential direction.

[0010] With such a configuration, when one of the connection expansion heads of the male joint is inserted into the female joint receiving cylinder opening at the axial end of the segment forming one of the shield rings, the connection expansion is provided. The receptacle pushes the receptacle inside the receiving cylinder and retreats against the resilience of the spring, and the retraction constitutes a chuck portion in which the restriction of the taper inner surface of the receiving cylinder in the centrifugal direction is released. The resilient piece is pushed and expanded in the centrifugal direction by the connecting bulging head, and the connecting bulging head enters the chuck portion. When the connecting bulging head that has entered the chuck portion exceeds the locking convex portion on the inner surface side of the distal end portion of the chuck portion, the resilient piece that has been expanded is restored and moves forward by the bias of the spring. The tapered sliding surface on the outer surface of the distal end portion slides on the tapered inner surface of the receiving cylinder and is pressed in the centripetal direction. When the connecting bulging head is about to come off, a locking projection is provided on the connecting rod side of the connecting bulging head on the inner surface side of the tapered sliding contact surface pressed in the centripetal direction by the tapered inner surface. Is locked, thereby preventing the connection bulging head from coming out of the receiving cylinder,
One of the connecting bulging heads of the female joint and the male joint of the segment is connected.

Next, when the other connecting bulging head of the male joint is inserted into the female joint receiving cylinder opening at the axial end of the segment forming the other shield ring,
In the same manner as described above, the female joint of the segment and the other connecting bulging head of the male joint are connected, whereby the shield rings are connected to each other.

When the male joint and the female joint are connected to each other, the stop member and the receptacle of the female joint are located within the movable range of the connecting portion between the connecting bulging head of the male joint and the female joint. A space is provided between the resilient piece and the locking convex portion provided on the inner surface side of the distal end of the resilient piece so that the connection bulging head can move within a predetermined range in the axial direction, and the resilient piece is repelled. A predetermined gap is provided along the circumferential direction between the inner periphery of the piece and the bulging head for connection, and furthermore, a locking protrusion provided on the inner surface side of the distal end portion of the resilient piece of the receptacle. Since it is formed by retaining a predetermined gap along the circumferential direction between the circumference and the connecting rod, when displacement occurs in the expansion and contraction direction between the connected shield rings, the female joint Provided on the inner surface of the tip of the resilient piece of the stop member and the receptacle. The connecting joint swelling head of the male joint moves in the axial direction in the space between the stop projection and the male joint to absorb the bulging head, and when displacement occurs in the shearing direction, the twisting direction, or the bending direction, the receptacle The gap between the inner circumference of the resilient piece and the bulging head for connection and the gap between the inner circumference of the locking projection provided on the inner surface side of the tip of the resilient piece of the receptacle and the connecting rod, The movement of the connecting bulging head and the connecting rod can absorb them, thereby preventing the shield ring itself from being damaged.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flexible joint device according to the present invention will be described below in detail with reference to the drawings. This flexible joint device includes one male joint 2 and two female joints 3A and 3B for connecting shield rings composed of a plurality of segments. Both the male joint 2 and the female joints 3A and 3B are formed of a metal such as stainless steel.

In the male joint 2, a connecting bulging head 5 formed in the same shape is provided at both ends of a connecting rod 4 having a predetermined length.
a, 5b are provided. The female joints 3A and 3B
Both have the same configuration as described later, and are provided at predetermined axially spaced intervals in the respective axial ends of the segments 1A and 1B constituting the opposed shield ring, and at positions opposed to each other. , Which are embedded and fixed so as to open at the ends.

The female joints 3A and 3B have the following configuration. Since the female joints 3A and 3B have the same configuration, the configuration of the female joint 3A will be described here, and the female joints 3B will be assigned the same reference numerals and description thereof will be omitted.

The female joint 3A is embedded and fixed in the segment 1A, and is opened at an axial end of the segment 1A.
A receiving cylinder body 6 into which one of the connecting bulging heads 5a of the male joint 2 is inserted, and an axially movably fitted inside the receiving cylinder body 6 and inserted into the receiving cylinder body 6; Connecting bulging head 5
a, a spring 7 for urging the receptacle 7 in the opening direction, and a connection with the distal end of the connecting bulging head 5a inserted into the receiving cylinder 6. And a stop member 9 for restricting an intrusion range of the bulging head 5a.

The receiving cylinder 6 is provided with a retaining flange 10 at its rear end, and a tapered inner surface 11 whose inner diameter gradually decreases toward the opening end on the opening inner peripheral surface.
And a stopper portion 12 that protrudes in the centripetal direction from the minimum diameter end of the tapered inner surface 11 and locks to the tip of the receptacle 7, that is, the tip of a resilient piece constituting a chuck portion described later. . In addition, a tapered guide surface 13 is formed at the open end to facilitate the insertion by aligning the connecting bulging head 5a.

In the receptacle 7, the receiving cylinder 6
Annular sliding body 14 fitted slidably in the axial direction on the inner circumference of
And a chuck portion 15 provided on the opening end side of the cylindrical receiving member 6 of the annular sliding member 14. The chuck portion 15 is provided on the annular sliding body 14 with a plurality of resilient pieces 16 which rebound in the centrifugal direction in a circumferential direction having a smaller diameter than the inner diameter of the receiving cylinder 6. A tapered sliding contact surface 17 that slides on the tapered inner surface 11 of the receiving cylinder 6 is provided on the outer peripheral surface of the distal end portion of the male joint 2. On the inner surface side, the connecting bulging head 5a of the male joint 2 is connected to the connecting rod 4 side. Locking projection 1 for locking
8 is provided. The resilient piece 16 provided in an annular shape is formed by inserting a slit 19 in a cylindrical body.

In the stop member 9, a locking flange 27 is formed at the rear end.
Are fitted to the large-diameter inner peripheral portion 26 formed at the rear end of the receiving cylinder 6, and the leading end side of the locking flange 27 abuts against the step of the large-diameter inner peripheral portion 26, and the locking flange 27 Is fixed to the receiving cylinder 6 by engaging a stop ring 28 attached to the rear end of the receiving cylinder 6.

Further, the connecting bulging head 5a of the male joint 2 is provided.
And the female joint 3A in the direction of expansion and contraction,
A movable range is provided in each of the twisting direction and the bending direction. In this movable range, the male joint 2 and the female joint 3A
In a connected state, between the stop member 9 of the female joint 3A and the locking projection 18 provided on the inner surface of the distal end portion of the resilient piece 16 of the receptacle 7, the connecting bulging head 5a is moved in the axial direction. in to possess distance L to a predetermined length extendable movement between the inner peripheral and the connection bulging head 5a of the elastic piece 16 of the receptacle 7, a predetermined gap S ₁ along the circumferential direction is held, furthermore, between the inner peripheral and connecting rods 4 of the locking portion 18 provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7, along the circumferential direction possess a certain clearance S ₂ It is formed by doing.

Although the configuration of the female joint 3A has been described above, the other female joint 3B has the same configuration. The female joint 3B is embedded and fixed in the segment 1B, and is attached to the axial end of the segment 1B. The female joint 3B is open, and the other connecting bulging head 5b of the male joint 2 is inserted into the female joint 3B, and the female joints 3A and 3B are connected via the male joint 2. .

As for the length of the connecting rod 4 of the male joint 2, the male joint 2 is inserted into the female joints 3A and 3B, and the connecting bulging heads 5a and 5b provided at both ends of the connecting rod 4 are provided. when contact with each respective female joint 3A, the segment 1A securing embedded 3B, a predetermined gap S ₃ between opposite ends of 1B occurs but each female joint 3A, the stop member 9 of 3B Set to length.

Next, connection of the shield ring by the flexible coupling device configured as described above will be described.

The opposing shield ring, the segments 1A, at a required clearance S ₃ between the opposite ends of the 1B constituting the opposed shield ring, and the female joint 3
A stop member 9 and the resilient piece 16 of the receptacle 7
Between the engaging protrusion 18 provided on the inner surface side of the distal end of the receptacle 7 so that the connection swelling head 5a can move in the axial direction by a predetermined length so as to be able to expand and contract. 16
Inner between said coupling bulging head 5a circumferentially along the circumferential direction is held a predetermined clearance S _1, further locking provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7 Convex part 18
Between the inner peripheral and connecting rod 4, along the circumferential direction it is adapted to be connected by held a predetermined clearance S _2.

[0025] Therefore, the segments 1A, between the respective opposed 1B, to form the clearance _{S 3,} and the gap S
₃ , the segments 1A and 1B are opposed to each other, and the male joint 2 inserted into the female joints 3A and 3B, respectively.
Are located between the locking projection 18 of the resilient piece 16 of the receptacle 7 and the stop member 9, and the coupling projections 5a, 5b are the locking projections. 18 and a stop member 9 so as to be able to expand and contract in the axial direction, and between the inner periphery of the resilient piece 16 of the receptacle 7 and the connecting bulging head 5a in the circumferential direction. along holds a predetermined clearance S _1, further between the inner peripheral and connecting rods 4 of the locking portion 18 provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7, along the circumferential direction spacers 20 for connecting to possess a predetermined clearance S ₂ is prepared Te, segments 1A, the axial end portion of the 1B, the mounting projections 21 arc direction for mounting the spacer 20 removably It is provided in. The spacer 20 is detachably attached to the attachment projection 21 with a bolt 22.

The spacer 20 has a slit 29 formed at the distal end thereof for press-fitting the connecting rod 4 of the male joint 2. The slit 29 connecting rod 4 which is press-fitted, said inner periphery of the resilient piece 16 of the receptacle 7 and the circumferential direction between the connection bulging head 5a possesses a predetermined clearance S ₁ when connected and, to possess a predetermined gap S ₂ along the circumferential direction between the inner peripheral and connecting rods 4 of the locking portion 18 provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7 , For positioning and support. This spacer 20
Is removed after connection is completed.
The connecting rod 4 of the male joint 2 that has been press-fitted into the hole can be pulled out of the slit 29.

The mounting projections 21 have female joints 3A, 3E embedded and fixed in the segments 1A, 1B.
B, the connecting bulging heads 5a, 5a of the male joint 2
A large-diameter hole 25 that does not hinder the insertion of b is provided.

Furthermore, the connection of the shield ring according to the flexible coupling device, the gap between the facing shield ring, or segments 1A constituting the opposing shield ring, to seal the gap S ₃ between 1B, the elastic seal A ring 23 is provided. In addition, a support member 24 that supports the elastic seal ring 23 from the inside is provided on the attachment protrusion 21 of one segment 1A (1B) so as to straddle the attachment protrusion 21 of the other segment 1B (1A). I have.

Now, in connection of the shield ring by the flexible joint device, the segments 1A and 1B
And one of the connecting bulging heads 5a of the male joint 2 is inserted into the female joint 3A embedded in one of the opposing segments 1A, and the other. Is inserted into the female joint 3B embedded in the other segment 1B, and the mounting projection 2 of the opposing segments 1A, 1B is inserted.
Butted with a spacer 20 interposed between 1 and 21,
The spacer 20 is attached to the mounting projection 2 by a bolt 22.
Fix to 1.

When the segments 1A and 1B abut each other, the one connecting bulging head 5a of the male joint 2 is inserted into the receiving cylinder 6 of the female joint 3A that is open at the end face of the one segment 1A. The receptacle 7 in the receiving cylinder 6 is pushed by the connecting bulging head 5a and retreats against the resilience of the spring 8, whereby the tapered inner surface 11 of the receiving cylinder 6 expands in the centrifugal direction. The resilient pieces 16 constituting the unregulated chuck portion 15 are connected to the bulging head 5a.
The connection swelling head 5
a enters the chuck portion 15. When the connecting bulging head 5a that has entered the chuck portion 15 passes over the locking convex portion 18 on the inner surface side of the distal end portion of the chuck portion 15, the expanded elastic piece 16 is restored, and the spring 8 is attached. The force is advanced by the force, and the tapered sliding contact surface 17 on the outer surface of the distal end portion slides on the tapered inner surface 11 of the receiving cylinder 6 and is pressed in the centripetal direction. When the connection swelling head 5a is about to come off, the connection swelling head 5a is connected to the connecting rod 4 side by the inner surface of the tapered sliding surface 17 pressed by the tapered inner surface 11 in the centripetal direction. A certain locking projection 18 is locked, thereby preventing the connection bulging head 5a from coming out of the receiving cylinder 6.

When the other connecting bulging head 5b of the male joint 2 is inserted into the receiving cylinder 6 of the female joint 3B which is open at the end face of the other segment 1B, the receiving cylinder is made in the same manner as described above. The connection bulging head 5b is prevented from coming out of the body 6. Thus, the female joints 3A, 3B are connected via the male joint 2, and the opposing segments 1A, 1B are connected to the male joint via the female joints 3A, 3B.

By connecting the segment 1B constituting the shield ring to the segment 1A constituting the shield ring arranged in the circumferential direction in this way, the opposing shield ring is connected in the circumferential direction. After connecting the shield ring constituted by the segments 1A and 1B as described above, the bolt 22 is removed and the spacer 20 is removed.

In this way, the connection of the shield ring is completed. In this connection state, the movable range of the connection between the connecting bulging heads 5a, 5b of the male joint 2 and the female joints 3A, 3B is obtained. , The male joint 2 and the female joints 3A, 3B
Is connected, the connection swelling head 5 is provided between the stop member 9 of the female joints 3A and 3B and the locking projection 18 provided on the inner surface of the distal end portion of the resilient piece 16 of the receptacle 7.
a, 5b is provided with an interval L so that it can move a predetermined length in the axial direction, and is provided between the inner periphery of the resilient piece 16 of the receptacle 7 and the connection bulging heads 5a, 5b along the circumferential direction. Te is held a predetermined clearance S _1, further between the inner periphery of the locking portion 18 provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7 and connecting rod 4, along the circumferential direction by a predetermined because of being formed by carrying a gap S _2, segment 1
A, when displacement occurs in the expansion and contraction direction between the shield rings formed and connected by the
The connection bulging heads 5a and 5b of the male joint 2 move in the axial direction between the stop members 9A and 3B and the locking projections 18 provided on the inner surface of the distal end portion of the resilient piece 16 of the receptacle 7. When the displacement occurs in the shearing direction and the torsional direction, the gap between the inner periphery of the resilient piece 16 of the receptacle 7 and the connecting bulging heads 5a and 5b is formed. gaps S ₁ and the gap S ₂ between the inner peripheral and connecting rods 4 of the locking portion 18 provided at the tip portion inner surface side of the elastic piece 16 of the receptacle 7, the connecting bulging head 5a, 5b and connecting rod 4
Can be absorbed by moving (FIG. 5), and when displacement occurs in the bending direction, the inner circumference of the resilient piece 16 of the receptacle 7 and the connecting bulging head 5
The gap S ₁ between the connecting rod 4 and the gap S ₁ between the connecting rod 4 and the inner circumference of the locking projection 18 provided on the inner surface of the distal end portion of the resilient piece 16 of the receptacle 7 are connected to each other. Bulging head 5
The movement of the connecting rods a and 5b and the connecting rod 4 can absorb them (FIG. 6). Thereby, damage of the shield ring itself constituted by the segments 1A and 1B can be prevented.

[0034] Then, by the displacement, the gap between the shield ring, i.e., the segments 1A, also vary the gap S ₃ between 1B, elastic sealing ring in response to this change 23
Can expand and contract, and the sealed state between the connected shield rings can be maintained.

[0035]

As described above, according to the flexible coupling device according to the present invention, the connection of the shield rings facing each other is as follows.
A simple connecting bulging head of one male joint is inserted into the female joint of the segment constituting one shield ring, and the other bulging head of the male joint is inserted into the female joint of the other segment. By the operation, the segments constituting the shield ring facing each other can be connected, and at the connection portion between the connecting bulging head of the male joint and the female joint, in the expansion and contraction direction, the shearing direction, the torsion direction, the bending direction. Since each movable range is provided, for example, when the shield ring is displaced in the expansion and contraction direction, the shear direction, the torsion direction, the bending direction, etc. due to unequal settlement or earthquake in soft ground or the like, the displacement is described as The absorption can be made in the movable range provided at the connection portion between the connection bulging head and the female joint, thereby preventing the shield ring itself from being damaged. Furthermore, since the configuration is simple, the work is easy and the construction can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a flexible joint device according to the present invention.

FIG. 2 is a partially enlarged view of FIG. 1;

FIG. 3 is a perspective view of a segment constituting a shield ring connected by the flexible joint device of the present embodiment.

FIG. 4 is a longitudinal sectional view showing a state of the male joint and the female joint when the shield ring (segment) connected by the flexible joint device of the present example is displaced in the extension direction.

FIG. 5 is a longitudinal sectional view showing a state of the male joint and the female joint when the shield ring (segment) connected by the flexible joint device of the present example is displaced in the shearing direction.

FIG. 6 is a longitudinal sectional view showing a state of a male joint and a female joint when a shield ring (segment) connected by the flexible coupling device of the present example is displaced in a bending direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1A, 1B Segment 2 Male joint 3A, 3B Female joint 4 Connecting rod 5a, 5b Expanding head for connection 6 Receiving cylinder 7 Receptacle 8 Spring 9 Stop member 10 Retaining flange 11 Taper inner surface 12 Stopper portion 13 Taper guide surface 14 Ring Sliding body 15 Chuck portion 16 Resilient piece 17 Tapered sliding contact surface 18 Locking convex portion 19 Slit 20 Spacer 21 Mounting projection 22 Bolt 23 Elastic seal ring 24 Support member 25 Hole 26 Large diameter inner peripheral surface 27 Locking flange 28 Stop ring 29 Slit L Interval S ₁ gap S ₂ gap S ₃ gap

Claims (2)

[Claims] 1. A flexible joint device for flexibly connecting shield rings composed of a plurality of segments, wherein a male joint and a female joint for connecting the shield rings are provided at axial ends of the segments. In the male joint, a connecting bulging head is provided at both ends of a connecting rod having a predetermined length. In the female joint, an axial end portion is embedded and fixed in the segment. And a connecting bulging head into which the connecting bulging head of the male joint is inserted, and a connecting bulging head which is fitted in the receiving cylinder movably in the axial direction and inserted into the receiving cylinder. A receptacle for stopping and stopping, a spring for urging the receptacle in the opening direction, and abutting against a tip of the connecting bulging head inserted into the receiving cylinder to restrict an intruding range of the connecting bulging head. Stop member and Has become equipped structure, the connecting portion of the connecting bulging head and female coupling of the male joint,
A flexible joint device, wherein a movable range is provided in each of a stretching direction, a shearing direction, a twisting direction, and a bending direction. 2. A tapered inner surface having an inner diameter gradually reduced toward an open end is provided on an opening side of the receiving cylinder of the female joint, and the receptacle is provided with a receiving cylinder on an opening side of the receiving cylinder. A tapered sliding contact surface that slides on the tapered inner surface of the receiving cylinder is provided on the outer surface of the distal end portion of the resilient piece that rebounds in the centripetal direction provided in the circumferential direction to be smaller than the inner diameter of Is provided with a chuck portion having a configuration in which a locking convex portion is provided for locking to the connecting rod side of the connecting bulging head of the male joint, and the connecting bulging head of the male joint and the female joint are provided. In the movable range of the connecting portion, in a state where the male joint and the female joint are connected, the stop member of the female joint and the locking protrusion provided on the inner surface of the distal end portion of the resilient piece of the receptacle. In the meantime, an empty space in which the connecting bulging head is movable within a predetermined range in the axial direction. Between the inner periphery of the resilient piece of the receptacle and the connection bulging head, and a predetermined gap along the circumferential direction, furthermore, the inner side of the tip of the resilient piece of the receptacle Between the inner circumference of the locking projection provided on the
The flexible joint device according to claim 1, wherein the flexible joint device is formed by having a predetermined gap along a circumferential direction.