JP3963674B2 - Lock ring insertion method of the separation prevention joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lock ring insertion method for a detachment prevention joint.
[0002]
[Prior art]
As a method for rehabilitating old pipes, there is known an existing pipe rehabilitation method, a so-called pipe-in-pipe construction method, in which an old pipe line is used as a sheath pipe, and new pipes are sequentially inserted into the pipe by a propulsion method.
[0003]
As a pipe joint employed in such a construction method, for example, as shown in FIG. 6, 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 opening 5 can be inserted to a position where the lock ring 3 hits the receiving opening side inner wall 6a of the engaging groove 6, and the locking ring 3 is inserted into the inner wall 6b on the back side of the receiving opening. The insertion slot 5 can be pulled out from the receiving slot 1 until it is engaged with each other, the expansion / contraction margin in the range of the axial width of the engagement groove 6 can be achieved, and seismic performance is imparted.
[0005]
In FIG. 6, reference numeral 4 denotes a rubber ring for sealing, which is arranged in the storage groove 1a on the inner surface of the receiving port 1, and is inserted by fitting the recess 4a of the rubber ring 4 for sealing to the protrusion 1b formed in the storage groove 1a. It is held so as not to be pushed into the receiving port 1 when the mouth 5 is inserted.
[0006]
By the way, in this rehabilitation method, the outer diameter of the new pipe is set to the maximum diameter that can pass through the existing pipe in order to avoid a reduction in the cross-sectional area of the flow path, while the wall thickness of the new pipe is reduced to make the new pipe inner diameter as small as possible The maximum cross-sectional area is ensured by increasing the size.
[0007]
Therefore, the seismic pipe joint 10 is also designed to reduce the wall thickness of the receiving port and increase the inner diameter as much as possible.
However, when a seismic joint for a new pipe is designed in this way, the radial thickness of the lock ring 3 disposed on the inner surface of the receiving port 1 and the depth d of the lock ring housing groove 2 formed on the inner surface of the receiving port 1. There is a problem that it becomes difficult to maintain the seismic performance at the same level as general pipe joints.
[0008]
For example, the lock ring 3 housed in the housing groove 2 of the receiving port 1 is deformed to expand in diameter when the insertion slot 5 is inserted, and is closely attached to the bottom surface of the storage groove 2, but allows the insertion slot 5 to pass through with sufficient margin. Therefore, when the depth of the storage groove 2 is determined so that the diameter of the lock ring 3 can be surely expanded and deformed in consideration of the tolerance, the storage groove is coupled with the fact that the wall thickness of the pipe wall of the receiving port is reduced. The thickness t of the two portions is locally thinned, and the strength of the receiving port is lowered due to this thinness, and the seismic performance is lowered with respect to a general seismic joint.
[0009]
On the other hand, a lock ring formed on the inner surface of the receptacle 1 as shown in FIG. 7 in order to prevent the strength of the receptacle 1 from being lowered due to the local thinness of the wall thickness t of the tube in the lock ring housing groove 2 portion. The depth d of the storage groove 2 is shallow and the thickness t of the lock ring storage portion is increased to increase the strength of the receiving port 1. When the lock ring 3 is stored, the inner diameter r of the lock ring 3 becomes the insertion outer diameter R. It is considered to be able to exhibit earthquake resistance by being able to be smaller than the above.
[0010]
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. .
[0011]
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. A seismic joint for existing pipe rehabilitation method was proposed, in which 3a was inserted and finally tightened with set bolts 8 ... so as to be able to exert a 3DkN (0.3Dtf, D: nominal diameter) detachment prevention force. ing.
[0012]
[Problems to be solved by the invention]
However, since the lock ring 3 is usually made of steel, when such a rigid member is inserted along the curved lock ring storage groove 2 on the inner periphery of the receiving port 1, the lock ring 3 receives the lock ring 3. The inner surface of the lock ring storage groove on the inner surface of the mouth or the outer surface of the insertion port may be rubbed strongly, and the inner surface of the storage groove may be damaged. In addition, there is a problem that this scratch may cause corrosion of the receiving port and the insertion port.
[0013]
In view of the above problems, the present invention has been made in order to safely insert a lock ring without damaging the inner surface of the receiving port or the outer surface of the insertion port when inserting the lock ring from the outer surface of the receiving port into the storage groove on the inner surface of the receiving port. It is a thing.
[0014]
[Means for Solving the Problems]
The lock ring insertion method of the separation preventing joint according to claim 1 is characterized in that after inserting the insertion opening of the other pipe into the receiving opening formed at the end of one pipe, the lock ring housing groove on the inner surface of the receiving opening is inserted. In the detachment prevention joint in which the lock ring member is inserted from the outer surface of the receiving port through the through hole, a thin metal plate is previously formed in the lock ring storing groove on the inner surface of the receiving port and in the lock ring storing groove on the outer surface of the inserting port. The pipe is joined with the guide plate inserted, and the lock ring is inserted between the guide plate made of a thin metal plate through the lock ring insertion through-hole on the outer periphery of the joint fitting joint. After the insertion, the thin metal plate guide plate is pulled out from the through hole.
[0015]
Therefore, according to the lock ring insertion method of the separation preventing joint, even if the lock ring is inserted with a strong force from the through hole formed on the side surface of the receiving port, the inner surface of the storage groove is protected by a thin metal plate guide plate. And prevented from being damaged.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, a method for inserting the lock ring of the separation preventing joint according to the present invention will be described.
1 is a cutaway perspective view of a main part of a receptacle of a detachment preventing joint for carrying out the method of the present invention, FIG. 2 is a perspective view of the same slot, and FIG. 3 is a connection of the slot of FIG. 2 to the receptacle of FIG. It is sectional drawing which shows the state which carried out.
[0017]
Before connecting the insertion opening 5 into the receiving opening 1, the lock ring housing groove 2 on the inner face of the receiving opening 1 as shown in FIG. 1 and the lock ring engaging groove 6 on the outer face of the insertion opening 5 as shown in FIG. Guide plates 11 and 11 made of a thin metal plate such as a stainless steel plate are installed over one turn.
[0018]
The guide plate 11 is coated with a viscous lubricating member such as grease on the surface so that the adhesive can be temporarily fixed to the storage groove by the lubricant.
The guide plate 11 is wound over one or more rounds so as to be longer by a length that can be pulled out from the through hole 7 formed in the side surface of the receiving port 1 after the insertion port 5 is inserted into the receiving port 1. .
[0019]
After the guide plates 11 and 11 are installed in the respective storage grooves 2 and 6 as described above, the insertion slot 5 is inserted into and connected to the reception slot 1 as shown in FIG.
After the connection, the surplus portions of the guide plates 11 and 11 are drawn out from the through hole 7 as shown in FIG.
[0020]
Then, as shown in FIG. 4, a lock ring insertion device 19 is attached to the vicinity of the through hole 7 on the outer surface of the receiving port 1.
The lock ring insertion device 19 has a piston cylinder reciprocating drive device 19 a, one end of which is pivotally supported by a fixed arm 22 fixed to the receiving port 1, and the other end of the operating rod 19 b is connected to the receiving port 1. The slider 20 is connected to a slider 20 supported so as to be movable in the direction, and the slider 20 is provided with an engagement device 19c that is detachably engaged with the lock ring 3.
[0021]
Then, the lock ring 3 curvedly arranged along the outer surface of the receiving port 1 is engaged with the engagement device 19 c of the slider 20.
Next, the tip is inserted into the through-hole 7 so that the lock ring 3 is sandwiched between the two guide plates 11, 11 drawn out from the through-hole 7, and then the piston cylinder reciprocating drive device 19a is shown in FIG. The operation is performed as indicated by the phantom line from the state of the solid line shown, and the lock ring 3 is fed into the through hole 7 while being guided by the guide rollers 18a, 18b, 18c.
[0022]
At this time, the lock ring 3 advances into the lock ring housing grooves 2 and 6 so as to be sandwiched between the two guide plates 11 and 11.
Therefore, the inner surfaces of the storage grooves 2 and 6 are prevented from coming into direct contact with the respective lock rings 3 by the guide plates 11 and 11 made of a thin metal plate such as a stainless steel plate.
[0023]
In addition, since the guide plate 11, 11 can be coated with viscous lubricating oil such as grease on the surface in contact with the lock ring 3, the frictional resistance with the lock ring 3 can be reduced by this application. You can also.
[0024]
Then, when the lock ring 3 is inserted over the entire circumference, the end is struck into the lock ring storage groove with a hammer or the like, and the whole is stored in the storage groove.
Thereafter, the guide plates 11, 11 partially protruding from the through hole 7 are pulled out of the pipe, the set bolt 8 is tightened, and the installation of the lock ring 3 is finished.
[0025]
【The invention's effect】
As described above, in the separation preventing joint in which the lock ring is inserted from the through hole on the outer surface of the receiving port, the thin guide plate made of a metal plate is inserted into the lock ring storage groove in advance. The inner surface of the storage groove is prevented from being damaged by contact friction with the lock ring into which it is press-fitted.
[0026]
Further, since the guide plate is pulled out of the through hole after the lock ring is inserted, these do not get in the way and the lock ring can be inserted efficiently.
[Brief description of the drawings]
FIG. 1 is a fragmentary perspective view of a receiving port of a detachment preventing joint for carrying out the method of the present invention.
FIG. 2 is a perspective view of an insertion opening of a detachment prevention joint for carrying out the method of the present invention.
3 is a cross-sectional view showing a state in which the insertion port of FIG. 2 is connected to the receiving port of FIG. 1;
FIG. 4 is a cross-sectional view showing a state where a lock ring is inserted.
FIG. 5 is an enlarged view of a main part of FIG.
FIG. 6 is a partially broken side view of a conventional pipe joint.
FIG. 7 is a partially cutaway side view of another conventional pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receptacle 1a Lock ring storage groove 2 Lock ring storage groove 3 Lock ring 4 Rubber band for seal 5 Insert 7 Through hole 11 Thin metal plate

Claims (1)

After inserting the insertion port of the other tube into the interior of the receiving port formed at the end of one of the tubes, the lock ring member is inserted through the through hole from the outer surface of the receiving port into the lock ring housing groove on the inner surface of the receiving port. In the anti-detachment joint designed to
A pipe is joined with a guide plate made of a thin metal plate inserted in advance in the lock ring housing groove on the inner surface of the receiving port and in the lock ring housing groove on the outer surface of the insertion port. The lock ring is inserted between the guide plate made of a thin metal plate from the through hole for inserting the lock ring, and after the lock ring is inserted, the guide plate made of the thin metal plate is pulled out of the through hole to lock the separation preventing joint. Ring insertion method.

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