JP3963687B2 - Lock ring insertion device for detachment prevention joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock ring insertion device for a detachment prevention joint.
[0002]
[Prior art]
As a means for correcting an old pipe, there is known an existing pipe correction method, a so-called pipe-in-pipe method, in which an old pipe is used as a sheath pipe and new pipes are sequentially inserted and laid in the pipe by a propulsion method.
[0003]
As a pipe joint employed in such a construction method, for example, as shown in FIG. 11, a lock ring 3 is attached to a lock ring storage groove 2 formed on the inner periphery of the receiving port 1, and a fixed portion is provided on the outer periphery of the insertion port 5. A circumferential engagement groove 6 having an axial width is formed, the lock ring 3 is positioned in the engagement groove 6, and the set bolt 8 is tightened to tighten the lock ring 3 in the engagement groove 6. There is a seismic joint 10 having a detached prevention structure.
[0004]
With such a configuration, the insertion slot 5 can be inserted to a position where the lock ring 3 hits the inner wall of the engagement groove 6 on the receiving opening side, and the locking ring 3 is engaged with the inner wall on the back side of the receiving slot. The insertion opening 5 can be removed from the receiving opening 1 until the engagement groove 6 can be expanded and contracted within the axial width range, and seismic performance is imparted.
[0005]
In FIG. 11, reference numeral 4 denotes a rubber band for sealing, which is arranged in the storage groove 1 a on the inner surface of the receiving port 1 and is inserted by fitting the recess 4 a of the rubber ring 4 for sealing to the protrusion 1 b formed in the storage groove 1 a. It is held so as not to be pushed into the receiving port 1 when the mouth 5 is inserted.
[0006]
[Problems to be solved by the invention]
By the way, in the earthquake-resistant joint 10, the thickness t of the pipe in the lock ring housing groove 2 portion is locally thinned to prevent the strength from being lowered, and the strong force applied from the lock ring 3 in the event of a large earthquake or the like. In order to prevent an accident such that the opening end of the receiving port is bent and deformed into a trumpet shape, for example, the depth d of the lock ring housing groove 2 formed on the inner surface of the receiving port 1 is decreased as shown in FIG. It is considered that the inner diameter r of the lock ring 3 can be made smaller than the outer diameter R of the lock ring 3 when the lock ring 3 is stored, and the thickness of the lock ring storage portion is increased to increase the strength.
[0007]
However, in this case, since the depth of the lock ring housing groove 2 is shallow, the outer diameter R of the insertion port 5 is larger than the inner diameter r of the lock ring 3 when the lock ring 3 is fitted, making insertion difficult. .
[0008]
Therefore, a through-hole 7 communicating with the lock ring housing groove 2 from the outer surface of the receiving port 1 is provided along the tangential direction of the receiving port 1, and the insertion port 5 is inserted into the receiving port 1 without the lock ring 3. After being inserted into the lock ring, the lock ring constituting member 3a can be inserted into the lock ring housing groove 2 facing the engaging groove 6 of the insert port 5 from the outer surface of the receiving port 1 through the through hole 7. 3a is inserted and finally tightened with set bolts 8 ... to provide a seismic joint for existing pipe refurbishment methods that can exert a 3DkN (0.3Dtf, D: nominal diameter) detachment prevention force. ing.
[0009]
However, since the lock ring is usually made of cast iron made of the same material as the cast iron pipe, inserting such a member 3a along the lock ring housing groove 2 on the inner periphery of the receiving port 1 while bending is powerful. Required a lot of force and was not easy to insert.
[0010]
In view of the above problems, the present invention has been made in order to facilitate insertion when a lock ring is inserted from the outer surface of the receiving port into the receiving groove on the inner surface of the receiving port.
[0011]
[Means for Solving the Problems]
The lock ring insertion device for a detachment prevention joint according to claim 1, wherein an insertion port formed at an end of the other tube is inserted into an interior of the reception port formed at the end of one tube, and then the inner surface of the reception port A lock ring insertion device for a detachment prevention joint in which a lock ring member is inserted into the lock ring housing groove from the outer surface of the receiving port through a through hole, along the outer periphery of the receiving port and along the insertion direction of the locking ring. Bending base frame that is detachable, a mover that is driven to reciprocate in the direction of the through hole along a guide rail on the bending base frame, and a gripping mechanism that uses a cam that is pivotally supported on the mover A gripping mechanism that engages with the lock ring member only when moving in the direction of the through-hole and releases the lock ring when moving in the reverse direction, and a lock ring member that is sent by the grip mechanism. To the through hole It is obtained and a guide roll for pressing Te.
[0012]
Therefore, according to the lock ring insertion device of the separation preventing joint of the present invention, since the lock ring is inserted along the curved rail, it is possible to easily insert the lock ring that has been curved in advance, and the lock ring member Since the guide roll guides the through hole, the lock ring can be inserted without difficulty.
[0013]
According to a second aspect of the present invention, there is provided the lock ring insertion device for the separation preventing joint according to the first aspect, wherein the cam constituting the gripping mechanism on the moving element is placed on the surface of the lock ring via a contact plate. So that they are in contact with each other.
[0014]
Therefore, according to the present invention, when the gripper mechanism is operated as the slider moves in the insertion direction of the lock ring, and the cam tries to bite into the lock ring, the cam contact surface and the lock ring Since the contact plate is interposed between the surface and the surface, stress concentration due to point contact of the cam contact surface on the lock ring surface can be prevented, and damage to the lock ring coating or local deformation can be prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, a lock ring insertion device according to an embodiment of the present invention will be described.
Embodiment 1
1 is a front view of a lock ring insertion device (hereinafter simply referred to as “lock ring insertion device”) of a separation preventing joint according to Embodiment 1 of the present invention, and FIG. 2 is a plan view of FIG.
[0016]
1 and 2, the same or corresponding members as those shown in FIGS. 11 and 12 are denoted by the same reference numerals, and detailed description thereof is omitted.
In FIG. 1, reference numeral 11 denotes a curved base frame that is detachable along the circumferential direction of the outer periphery of the receiving port 1. The curved base frame 11 includes a guide rail 11 a that travels and supports a moving element 19, which will be described later, and substrate portions 12 and 12 that are provided on a circumferential extension of the curved base frame 11. And after arrange | positioning with respect to the through-hole 7 for a lock ring insertion, it uses the screw holes 12a and 12a part of the socket 1 in the screw holes 12a and 12a part formed in the board | substrate part 12, and uses a mounting bolt 15 and 15 can be detachably fixed.
[0017]
Further, the lock ring member 3a is supported by the guide roll 16 of the lock ring member 3a on the curved base frame 11 facing the through hole 7 formed in the receiving port 1 and further propelled toward the guide roll 16. Bearing rolls 17 and 17 for reducing the friction are supported.
[0018]
As shown in an enlarged view in FIG. 4, the guide rail 11 a is formed in the lateral direction of the curved base frame 11, and another guide rail 11 a is provided in parallel with the guide rail 11 a along the outer circumference of the pipe, with a width B therebetween. A wheel 18 having a diameter smaller than the width B is fitted between the guide rails 11a in a groove 11b formed between the guide rails, so that the wheel 18 travels along either the upper or lower guide rail 11a.
[0019]
The mover 19 has a base plate 19a that rises in the radial direction with respect to the guide rail 11a, and wheels 18 that run while engaging the guide rail 11a are pivotally supported at the base of the base plate 19a.
[0020]
On the side surface of the substrate 19a, as shown in FIG. 3, a shelf plate 19b for receiving the lock ring member 3a is extended on the wheel 19 so as to be sandwiched between the guide rails 11a. An eccentric cam 20 is placed on the shelf plate 19b. Is pivotally supported around a shaft 20b parallel to the tube shaft of the receiving port 1, and the outer periphery 20a is pivotally supported so as to face the outer surface of the rock cling member 3a placed on the shelf plate 19b. .
[0021]
And one end of the hydraulic jack 21 is connected to the outer peripheral rear end side across the shaft 20b of the eccentric cam 20 via a pivot point 20c.
The other end of the hydraulic jack 21 is attached to a bracket 22 formed on the curved base frame 11 by a pin 22a, and the eccentric cam 20 and the mover 19 are moved along the guide rail material 11a by the operation of the hydraulic jack 21. It is designed to reciprocate.
[0022]
Therefore, when the hydraulic jack 21 is retracted (when the hydraulic cam 21 is moved in the right direction in the figure), the eccentric cam 20 has a lock ring member 3a on the guide rail 11a due to a force applied between the pivot point 20c and the shaft 20b. In contact with the shelf plate 19b and moved together with the moving element 19, and during the reverse travel, the arm is between the pivot point 20c and the shaft 20b. It is a “grip mechanism” that operates to open by force.
[0023]
The hydraulic jack 21 is adapted to move in and out by hydraulic pressure applied to the hydraulic ports 21a and 21b from a hydraulic device (not shown).
Next, a process of inserting the lock ring member 3a by the lock ring insertion device of the separation preventing joint will be described.
[0024]
As shown in FIG. 11, after the rubber ring 4 for sealing is inserted into the tube receiving port 1, the tube insertion port 5 to be connected is inserted and connected.
Next, as shown in FIG. 1 and FIG. 2, the curved base frame 11 is installed on the through hole 7 for inserting the lock ring formed in the outer periphery of the receiving port 1 so that the guide roll 16 is aligned, and then for the set bolt It fixes to the outer peripheral surface of the receiving port 1 with the attachment bolts 15 and 15 using the screw holes 14 and 14. FIG.
[0025]
Next, the lock ring member 3a is inserted into the through hole 7 through the space between the outer periphery 20a of the eccentric cam 20 of the moving element 19 and the upper surface of the guide rail 11a.
As the lock ring member 3a, as shown in FIG. 1, a C-shaped split ring or a single straight bar is used.
[0026]
Then, as shown in FIG. 5, the piston 19a of the hydraulic jack 21 is protruded, and the moving element 19 is moved to a position farthest from the through hole 7 on the curved base frame 11a.
At this time, since the eccentric cam 20 is open to the lock ring member 3a, the eccentric cam 20 slides in a state where the outer periphery 20a is in contact with the outer periphery of the lock ring member 3a.
[0027]
Next, the hydraulic pressure is switched, and the piston 21a is immersed as shown in FIG.
Along with this immersion, the moving element 19 also moves in the direction of the through-hole 7. At this time, since the outer periphery 20a is tightened into the outer periphery of the lock ring member 3a by friction, the eccentric cam 20 moves the lock ring member 3a. Tighten tightly.
[0028]
Accordingly, as shown in FIG. 6, the moving element 19 moves in the direction of the through hole 7 together with the lock ring member 3a, and the lock ring member 3a is guided by the bearing rolls 17 and 17 while the friction is reduced by the moving distance. 16 is guided into the lock ring storage groove 2 of the receiving port 1 and inserted.
[0029]
When the immersion process of the hydraulic jack 21 is completed, the hydraulic circuit is switched again and the piston 21c is protruded. Then, the moving element 19 moves in the original direction, the eccentric cam 20 is also released from the engaged state with the lock ring member 3a, and only the moving element 19 returns to the original position while leaving the lock ring member 3a.
[0030]
Then, when the piston of the hydraulic jack 21 is inserted again, the eccentric cam 20 tightens the outer periphery of the lock ring member 3a and tightens the outer periphery of the lock ring member 3a in the same manner as described above, and the lock ring member 3 is accommodated in the storage groove 2 by the stroke of the hydraulic jack 21. Carry it in.
[0031]
This is repeated until the lock ring member 3a is inserted into the lock ring storage groove 2 over the entire circumference.
It should be noted that the distance from the most immersive position of the moving element 19 provided with the eccentric cam 20 to the through hole 7 is a distance L, and the lock ring member 3a cannot be completely inserted. Therefore, another member 23 is added by a pin 23a to the rear end portion of the lock ring member 3a inserted as shown in FIG. 7, and the lock ring member 3a is inserted into the insertion groove 2 through the member 23. Insert it completely.
[0032]
Finally, the member 23 is removed, the curved base frame 11 is removed, and the set bolt is fastened.
In the above embodiment, the pin 23a is simply inserted into the fitting hole 23b formed in the end face of the extension member 23. However, the bolt 24 is used instead of the pin 23b as shown in FIG. The screw holes 25 may be formed in the screw holes, and the screw holes 25 may be screwed into the holes. In this case, the extension member 23 is attached or detached by screwing or releasing by rotation around the axis of the extension member 23.
[0033]
Embodiment 2
FIG. 9 is an enlarged front view of a main part of the lock ring insertion device for the separation preventing joint according to the second embodiment, and FIG. 10 is a cross-sectional view taken along the line BB in FIG.
[0034]
9 and 10, the same or corresponding members as those shown in FIGS. 11, 12, 1, and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
The lock ring insertion device of the separation preventing joint of the second embodiment is configured by arranging a contact plate 26 that contacts the outer surface of the lock ring member 3a on the outer periphery 20a side of the rotating arm 20.
[0035]
As shown in FIG. 10, the abutting plate 26 has a U-shaped cross section with support plates 26 a, 26 a on both sides, the rotating arm 20 is sandwiched between the support plates 26 a, and the abutting plate 26 is pinned by pins 27. It is attached so as to be inserted between the tip of the eccentric cam 20 and the lock ring member 3a.
[0036]
The pin 27 and the contact plate 26 are relatively rotatable about the pin 27 as an axis. The contact surface 26b of the abutting plate 26 with respect to the lock ring member 3a is provided with serrated teeth 26c in order to improve the biting against the lock ring member 3a.
[0037]
According to the lock ring insertion device for the separation preventing joint having this structure, when the piston 21a is immersed and the moving element 19 is moved in the direction of the through hole 7, the contact plate 26 is rotated by the rotation of the rotation arm 20 around the axis 20b. , The outer surface of the lock ring member 3a comes into contact with the outer surface of the lock ring member 3a. As a result, the force applied to the contact plate 26 via the rotary arm 20 or the pin 27 is expanded to a large area by the contact plate 26, and the lock ring member 3a is Tighten. The lock ring member 3 a is fixed to the moving element 19 by this tightening force, and as a result, moves together with the moving element 19 in the direction of the through hole 7.
[0038]
Accordingly, it is possible to prevent the surface of the lock ring member 3a from being deformed or the strength from being locally lowered due to the stress concentration.
Further, the biting of the serrated teeth 26c prevents the contact plate 26 from sliding along the lock ring member 3a, and the feed movement in the insertion direction is surely performed.
[0039]
When the moving element 19 moves to the double stroke, the rotating arm 20 rotates in the loosening direction, so that the tightening force is released, and the contact plate 26 is separated from the lock ring member 3a. It is returned to the original position by being dragged to prepare for the next insertion process.
[0040]
Therefore, according to the structure of the second embodiment, stress concentration due to local contact with the eccentric cam 20 of the lock link member 3a can be prevented, and local deformation and paint damage can be prevented.
[0041]
【The invention's effect】
As described above, according to the lock ring insertion device of the first aspect, the depth of the lock ring housing groove is shallower than that of the conventional one, and the strength of the receiving port is increased. When inserting the lock ring member, the lock ring member is inserted by the moving element that moves along the curved path, so that the lock ring can be inserted without difficulty, and the guide roll locks to the through hole. Since the ring member is guided, it is possible to prevent the lock ring from being caught or rubbed by the opening of the through hole. Therefore, the resistance at the time of insertion is small, and the lock ring can be easily inserted.
[0042]
When mounting the curved base frame, the screw holes for the set bolts on the outer periphery of the receiving port are utilized, so that the mounting is easy, the mounting strength is strong, and the detachment preventing force is 3DkN (0.3 Dtf, D : Nominal diameter) and other various effects.
[0043]
In addition, if a contact plate is provided at the tip of the eccentric cam as in claim 2, stress concentration on the lock ring member during insertion of the lock ring member can be prevented, and local deformation of the lock ring and coating damage can be prevented. It has effects such as.
[Brief description of the drawings]
FIG. 1 is a front view of a lock ring insertion device for a detachment prevention joint according to an embodiment of the present invention.
FIG. 2 is a plan view of FIG. 1 with the hydraulic jack removed.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged cross-sectional view of a main part of a lock ring insertion device for a detachment prevention joint according to an embodiment of the present invention.
FIG. 5 is an operation explanatory view of the lock ring insertion device of the separation preventing joint according to the embodiment of the present invention.
FIG. 6 is an operation explanatory view of the lock ring insertion device of the separation preventing joint according to the embodiment of the present invention.
FIG. 7 is an operation explanatory view of the lock ring insertion device of the separation preventing joint according to the embodiment of the present invention.
FIG. 8 is a side view showing another member added to the lock ring member.
FIG. 9 is a front view of an essential part of a lock ring insertion device for a detachment prevention joint according to Embodiment 2 of the present invention;
10 is a cross-sectional view taken along line BB in FIG.
FIG. 11 is an explanatory sectional view of a seismic pipe joint.
FIG. 12 is an explanatory cross-sectional view of another earthquake-resistant pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receptacle 2 Lock ring accommodation groove | channel 3a Lock ring member 7 Lock ring member insertion slot 11 Curved base frame 11a Guide rail 12 Substrate 18 Wheel 19 Moving element 20 Eccentric cam 21 Hydraulic jack 26 Contact plate 27 Pin

Claims (2)

After inserting the insertion port formed at the end of the other tube into the interior of the reception port formed at the end of one tube, the lock ring housing groove on the inner surface of the reception port passes through the through hole from the outer surface of the reception port. A lock ring insertion device for a detachment prevention joint into which a lock ring member is inserted, comprising a curved base frame that is detachable along the outer periphery of the receiving port and along a lock ring insertion direction, and the curved base A gripping mechanism using a mover that is driven to reciprocate in the direction of the through-hole along a guide rail on a frame, and a cam that is pivotally supported on the mover, the direction of the through-hole with respect to the lock ring member Detachment provided with a gripping mechanism that engages only when moving to the opposite direction and releases the lock ring when moving in the opposite direction, and a guide roll that presses the lock ring member fed by the gripping mechanism toward the through hole Prevention joint b Kling insertion device. 2. A lock ring insertion device for a detachment prevention joint according to claim 1, wherein a cam constituting a gripping mechanism is brought into contact with the surface of the lock ring via a contact plate on the movable element. apparatus.

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