JP3492390B2 - New pipe connection method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting an existing pipe into a ring shape in a sealed case surrounding the outer circumference of the existing pipe .
A new pipe such as a flexible pipe joint or a valve is fitted into the cut portion, and a connecting ring is externally fitted over the outer peripheral surface on the connection end side of the new pipe and the outer peripheral face on the cut end side of the existing pipe. The present invention relates to a method for connecting newly installed pipes, in which the closed case is removed after connecting the existing pipes to existing pipes . 2. Description of the Related Art As a method for connecting new pipes, for example,
As shown in Japanese Patent Publication No. 59-42193, etc., a connecting ring is previously held on the outer periphery of an existing pipe in a sealed case, and then the existing pipe is cut into a ring shape. There is a construction method in which the connecting ring held on the outer periphery is drawn out to the newly installed pipe side, and is fitted over the outer peripheral surface on the connection end side of the newly installed pipe and the outer peripheral surface on the cut end side of the existing pipe . [0003] According to this connection method, the existing inside of a closed case is
After holding the connecting ring on the outer circumference of the pipe, the existing pipe is
So that it can be mounted around the existing pipe,
Divide the connecting ring into multiple pieces in the circumferential direction, and
It is necessary to attach while connecting along the outer circumference of the pipe,
Skills are required to connect with high precision in a site where business conditions are severe
In addition, there is a disadvantage that the amount of work increases. Therefore, conventionally, the outside of the connection end of the newly installed pipes has
In order to seal between the outer surface of the existing pipe and the
The joint ring with seal material is movably held in the pipe axis direction
And fit the newly installed pipe holding the connecting ring
After fitting, push out the connecting ring to the existing pipe side and
A connection method that fits over the outer peripheral surface and the outer peripheral surface on the cut end side
(For example, Japanese Patent Laid-Open No. 2-3797)
reference). [0005] Conventional connection of newly installed pipes
According to the construction method, it was held on the outer peripheral surface on the connection end side of the new pipes
Extrude the connecting ring to the existing pipe side and cut the outer peripheral surface at the connection end side
Cut the existing pipe because it is fitted over the outer peripheral surface on the end side.
Before installing the connecting ring around the existing pipe.
And installs the connecting ring without dividing it into multiple pieces in the circumferential direction.
Can reduce the work of installing the connecting ring on site.
There are some points, but there is still room for improvement in the following points. A joint held on the outer peripheral surface on the connection end side of the newly installed pipes.
The ring has a seal to seal between the outer circumference of the existing pipe.
Is installed on the outer surface of the newly installed pipes.
Because it is in close contact, pull out the connecting ring to the existing pipe side,
Externally fitted over the outer peripheral surface on the connection end side and the outer peripheral surface on the cut end side
In this case, the sealing material is easily caught on the sharp cutting end of the existing pipe.
Not only takes time to pull out and move the connecting ring,
In some cases, the sealing material was damaged. [0007] The present invention has been made in view of the above circumstances, and is connected to a newly installed pipe which is advantageous in terms of mounting work on site.
Damage to the seal material while adopting the method of assembling the ring in advance
Operation of pulling out the connecting ring efficiently and easily
The purpose of the present invention is to provide a connection method for newly installed pipes that can be used . [0008] A feature of the present invention to achieve the above object is a connection method for newly-installed pipes described above, in which a connection end side outer peripheral surface of the newly-installed pipes is provided in advance. , Outer circumference of existing pipe
A connecting ring with a sealing material for sealing between the surfaces ,
Fitted on the inner peripheral surface side of the seal material attached to the connecting ring
Guide tube and allowed to movably hold the pipe axis direction Rutotomo
In addition, the maximum pull-out position of the connecting ring is
Restriction of draw-out amount that regulates to a predetermined connection position over the outer peripheral surface
Measures should be taken to cut off new pipes holding the connecting ring.
After fitting in place , connect the connecting ring and guide tube to the specified connection position.
Up to the existing pipe side, the outer peripheral surface at the connection end side and the cut end
Outer peripheral surface, and then a guide cylinder is installed.
The point is that the pipe is pulled out from the sealing material of the connecting ring along the outer peripheral surface of the pipe . The connecting ring held on the outer peripheral surface on the connection end side of the newly installed pipes is drawn out to the existing pipe side, and is externally fitted over the outer peripheral surface on the connection end side and the outer peripheral surface on the cut end side. It is not necessary to attach a connecting ring to the outer circumference of the existing pipe before cutting the pipe, and the connecting ring can be attached without being divided into a plurality of pieces in the circumferential direction. In addition, on the outer peripheral side of the connection end side of the newly installed pipes,
Is fitted on the inner peripheral surface side of the seal material attached to the connecting ring
Are Rutoto the guide tube is movably held in the pipe axis direction
In addition, the maximum withdrawal position of the connecting ring is cut from the outer peripheral surface on the connection end side.
A drawer that regulates to a predetermined connection position over the outer peripheral surface on the end side
Control means are provided so that the guide tube and
By pulling out to the existing pipe side to the fixed connection position,
Avoid sealing material is caught sharp disconnect end surface of the existing pipe
can do. Further, the maximum pull-out position of the connecting ring is
It was withdrawn because it was regulated by quantity control measures
While keeping the connecting ring in the specified connection position,
From the sealing material of the connecting ring along the outer circumference of the existing pipe
Can be easily pulled out. [0012] Therefore, the present invention is advantageous in terms of mounting work in the field.
While adopting a method of pre-assembly the connecting ring on the tubing side,
Avoid damage to sealing material due to sharp cutting end of existing pipe
While maintaining the splice ring in place.
Is it possible to easily pull out only the guide tube while holding it
The operation of pulling out the connecting ring can be performed efficiently and easily.
I can . FIG. 5 shows a water pipe A buried underground, which is an example of an existing pipe, cut in a ring shape without interruption of tap water flow. 1 shows a connection structure for newly installed pipes in which a flexible pipe joint B as an example of newly installed pipes is fitted and connected to a water pipe A via a connecting ring 1. In the pipe joint B, the connection end face 3 facing the cut end face 2 of the water pipe A is formed in such a shape that a virtual plane including the connection end face 3 is slightly inclined with respect to a plane orthogonal to the pipe axis X. the two respective connection sleeve 4 which is, along with slidably fitted on the pipe axis X direction of the ring member 5 across the sealing rubber ring P _1, on the outer circumferential surfaces of the ring member 5 fitted around the connecting sleeve 6 across the sealing rubber ring P ₂ over, sliding surface S of the connecting sleeve 6 with two ring members 5
Are formed in a spherical shape, and while these two connection sleeves 4 and the connection sleeve 6 are kept watertight with each other, a lock ring 7 fixed to each of the two connection sleeves 4 is attached to the inner peripheral surface of the ring member 5. Are connected so as to be able to expand and contract over the movable range in the annular recessed portion 8 and to swing along the sliding contact surface S. Next, a description will be given of a method of connecting the pipe joint B to the water pipe A in a water-free state to make the water pipe A flexible. As shown in FIG. 8, the pit C is excavated to expose the water pipe A, concrete is cast on the bottom of the pit C to form the base 10, and the outer peripheral surface of the water pipe A is cleaned. While wearing 11 in a predetermined posture,
An upper and lower hydraulic tank 9 provided with a gate valve 12 is placed on a support base 10, and the outer periphery of the water pipe A is surrounded by the hydraulic tank 9 together with the cutting machine 11. The hollow connecting rod 13 is mounted so as to penetrate the upper wall of the hydraulic tank 9 in a watertight manner so as to be vertically slidable. Next, after confirming the watertight state of the water pressure tank 9, the connecting rod 13 is lowered to drive the cutting machine 11, and the cutting end face 2 becomes a virtual axis including the cutting end face 2 in the pipe axis X. Water pipe A with a slight upward inclination with respect to the orthogonal plane
After partially cutting into a ring shape, as shown in FIG.
The connecting rod 13 is raised, and the cutting machine 11 is moved upward in the pressure tank 9 together with the ring-shaped cutting pieces 14. The upper tank surrounding the cutting machine 11 inside the pressure tank 9 with the valve element 15 of the gate valve 12. 9a and a lower tank 9b surrounding the cut-off point D side of the water pipe A in a watertight manner. Next, the water in the upper tank 9a is discharged and the pressure is reduced to approximately atmospheric pressure.
Is removed together with the flange lid 9c constituting the upper surface of the upper tank 9a, and as shown in FIG. 10, the connecting rod 13 is connected to the connecting socket 16 of the pipe joint B, and the pipe joint B is inserted into the upper tank 9a. Attach and fix the flange lid 9c in a watertight manner. Pipe fitting B attached to the connecting rod 13
As shown in FIG. 1, two connecting sleeves 4 and a connecting sleeve 6 are fixed to each other by bolts and nuts 17 and held coaxially in a state in which they cannot expand and contract and cannot swing. The connecting ring 1 is integrally formed in a ring shape on each of the connecting end side outer peripheral surfaces 18 of the connecting sleeve 4, and two sealing materials are held on the inner peripheral side of the connecting ring 1. 2 which is integrally formed in a ring shape that presses over respectively collar inner peripheral surface of the sealing rubber ring P ₃ and Kangaishu surface and
It is inserted and the number of pressing wheels 19, these and collar 1 and press wheel 19 is movably held by being loosely connected by bolts and nuts 20 to the pipe axis X direction. Two sealing O-rings 21 serving as a sealing material are mounted between the connecting ring 1 and the outer peripheral surface 18 on the connection end side, and seal between the outer peripheral surface of the water pipe A.
Inside the connection end face of the 3-side O-ring 21 and the sealing rubber ring P ₃ is a sealing material for, so that the operation of pulling out a collar 1 which will be described later can be performed smoothly, the guide tube 23 having a flange 22 is fitted ing. Next, water is injected into the upper tank 9a from the lower tank 9b through the bypass to eliminate the pressure difference between the two tanks 9a and 9b, and then, as shown in FIG.
2 is opened, the pipe joint B is lowered along the guide member (not shown) with the connecting rod 13 and fitted into the cutout D, and the pipe joint B is connected with the centering device (not shown) provided in the lower tank 9b. Align the axis of B with the axis of water pipe A. In addition, the interval between the cut end surfaces 2 of the water pipe A is formed so as to be wider toward the upper side,
Since the space between the connection end faces 3 of the pipe joint B is formed so as to be narrower toward the lower side, it can be fitted smoothly. Next, as shown in FIG. 2 and FIG.
The connecting ring 1 is pushed by the pull-out mechanism 19 and the guide cylinder 23 by a drawer mechanism E provided between the connecting ring 1 and the hydraulic tank peripheral wall 24.
Together with the outer periphery 18 of the connection end and the outer periphery 25 of the cut end in a state where the connecting ring 1 straddles the gap d formed between the connection end 3 and the cut end 2. After the external fitting, as shown in FIG.
Drawn from the inside of the ring 21 and the sealing rubber ring P _3. The draw-out mechanism E includes a hollow hydraulic cylinder 26 fixed to the tank peripheral wall 24,
And the hydraulic cylinder 26 through the hydraulic cylinder 26.
6, an operation shaft member 27 which is inserted in a watertight manner, a long hole 29 formed in a flange 28 of the connecting ring 1 as shown in FIG. 6, and a flange of a guide cylinder 23 as shown in FIG. The long hole 30 formed in 22 and the maximum draw-out of the connecting ring 1
The position extends over the outer peripheral surface 18 on the connection end side and the outer peripheral surface 25 on the cut end side.
Of drawer amount control means for restricting to a predetermined connection position
In, it is constructed by providing the collar 1 of the flange 28 and the flange 31 and the positioning bolts 32 for the withdrawal-amount regulation are inserted over the connecting sleeve 4, T-shaped for retaining the positioning bolts 32 A head 33 is provided and one end thereof is bolted to the flange 28 of the connecting ring 1. Then, as shown in FIG.
4, the operating shaft member 27 is pushed into the connecting ring 1 side from the outside of the tank while looking into the tank through the viewing window provided in the tank 4, and the locking piece 34 formed at the end thereof is connected to the long hole 30 of the guide cylinder flange 22. The operating shaft member 27 is rotated by about 90 degrees to sequentially insert the locking piece 34 into the elongated hole 29 of the ring flange 28.
Is locked to the connecting ring flange 28 and the piston 38 of the hollow hydraulic cylinder 26 is controlled until the drawer of the connecting ring 1 is restricted by the contact between the T-shaped head 33 of the positioning bolt 32 and the flange 31 of the connecting sleeve 4. When the extension operation is performed,
As shown in FIG. 3, the connecting ring 1 is fitted over the connection end side outer peripheral surface 18 and the cut end side outer peripheral surface 25 in a predetermined posture while straddling the gap d. [0024] The guide tube 23 holds and the O-ring 21 for sealing rubber ring P ₃ of the connecting end face 3 side to the expanded state,
When the connecting ring 1 is pulled out, these sealing rubber rings P ₃
The O-ring 21 and the O-ring 21 are provided so as to smoothly move over the cut end surface 2 and move to the cut end side outer peripheral surface 25 side, and an outwardly expanding guide surface 35 that receives the cut end surface 2 inside is formed. . After the connecting ring 1 is externally fitted over the outer peripheral surface 18 on the connection end side and the outer peripheral surface 25 on the cut end side, the hollow hydraulic cylinder 26 is once contracted to operate the locking piece of the operating shaft member 27. 4 and loosen the engagement between the connecting ring flange 28 and FIG.
As shown in the figure, the locking piece 34 is pulled out from the elongated hole 29 of the connecting ring flange 28 and locked to the guide cylinder flange 22, and a nut 37 screwed to the operation shaft member 27 is applied to the piston 38. When the hollow hydraulic cylinder 26 is extended again, the guide cylinder 23 moves out of the water pipe A.
It is drawn from the inside of the sealing rubber ring P ₃ and O-ring 21 along the circumferential surface, of the two jetting tap water O-ring 2
1 and the water pipe A and the pipe joint B
Is temporarily connected via Next, after draining the water in the hydraulic tank 9 to reduce the pressure to about the atmospheric pressure, opening the flange lid 9c and completing the drainage, the pipe joint B and the connecting rod 13 are separated and the hydraulic tank is removed. 9 is removed, and as shown in FIG.
And the flange 31 of the connecting sleeve 4 and the connecting ring 1 are fixed to each other with a nut 36 using a positioning bolt 32, and the pressing ring 19 is further bolted on the inner peripheral side of the connecting ring 1 with a nut 20. push to, pressed over the wheel inner peripheral surface splicing each of the sealing rubber ring P ₃ and Kangaishu surface to the connected water-tightly through the wheel 1 Pieces and water pipes a and pipe fittings B. Thereafter, the guide cylinder 23 is blown off and removed, and the bolts and nuts 17 for fixing the connection sleeve 4 and the connection sleeve 6 to each other are removed, and the connection sleeve 6 and the two connection sleeves are removed. The sleeve 4 is restored to a state where it can be extended and contracted and swingable. [Alternative Embodiment] In the embodiment, a flexible pipe joint is shown as an example of new pipes to be connected to a cut part of an existing pipe. However, a connection connected to a cut part of an existing pipe via a splicing ring is shown. If it has an end, it may be a pipe for connecting a branch pipe, a pipe provided with various valves as necessary, or a pipe to which a measuring device such as a flow meter or a pressure gauge is attached. The shape and function are not particularly limited. In the present embodiment, the existing pipe buried underground is described, but the present invention may be applied to an existing pipe laid on the ground. In this embodiment, a water pipe is shown as an example of the existing pipe, but an existing pipe for transporting a fluid such as gas or oil may be used, and its function is not particularly limited. In this embodiment, the connecting ring integrally formed in a ring shape is shown, but a connecting ring formed in a ring shape by connecting a plurality of divided members in a circumferential direction in series may be used. . In the present embodiment, a pressing ring for pressing the sealing elastic ring held by the connecting ring over the inner peripheral surface of the connecting ring and the outer peripheral surface of the pipe is integrally formed in a ring shape, and the connection end side of the newly installed pipes is previously formed. Although was held on the outer circumferential surface may be a press wheel a dividing member which is divided into a plurality in the circumferential direction and connected to a series are formed in a ring shape. In the present embodiment, in advance, the elastic ring for sealing held by the connecting ring is pressed over the inner peripheral surface of the connecting ring and the outer peripheral surface of the pipe with a pressing ring formed in a ring shape. A plurality of push members that are separately mounted along the circumferential direction of the lever,
You may comprise so that the elastic ring for sealing may be pressed.
Instead of the guide tube 23 shown in the embodiment may be implemented by providing a guide tube that holds only sealing rubber ring P ₃ of the connecting end face 3 side expanded state. In this case, when the connecting ring 1 is pulled out, as long as the O-ring 21 on the connecting end surface 3 side gets over the cut end surface 2, the connecting ring 1 is moved over the connecting end side outer peripheral surface 18 and the cut end side outer peripheral surface 25. in a state where the fitting is, since ejection of tap water is prevented by two O-ring 21, without drawing the guide tube from the inside of the sealing rubber ring P _3, wheel splicing a water pipe a and pipe fittings B 1 can be temporarily connected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional side view showing a connection method for newly constructed pipes. FIG. 2 is a partial cross-sectional side view showing a connection method for newly constructed pipes. Partial sectional side view showing the construction method. [FIG. 4] Partial sectional side view showing the connecting method for newly constructed pipes. [FIG. 5] Side view showing the connection structure of newly constructed pipes. [FIG. 6] Front view showing the flange of the connecting ring FIG. 7 is a front view showing a flange of the guide tube. FIG. 8 is a schematic diagram showing a connecting process of newly installed pipes. FIG. 9 is a schematic diagram showing a connecting process of newly installed pipes. FIG. FIG. 11 is a schematic diagram showing a process. FIG. 11 is a schematic diagram showing a process for connecting a new pipe. [Description of References] 1 Connecting ring 9 Sealing case 18 Connection end side outer peripheral surface 21 Seal material (O-ring for sealing) 23 Guide cylinder 25 Cutting End side outer peripheral surface A Existing pipe B New pipes D Cutting part P ₃ Seal material (Rubber ring for sealing) X Tube shaft core

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 51/00-55/24 F16L 1/00 F16L 41/06

Claims (1)

(57) [Claims] [Claim 1] The existing pipe is cut into a ring shape in a sealed case surrounding the outer circumference of the existing pipe , and a new portion is cut at the cut portion .
Fit the 設管acids, and fitted the collar over the connection end side outer peripheral surface and the cut end side outer peripheral surface of the existing pipe <br/> the new tubing, new tube
After connecting the kind and existing pipe, a connection method of the new tubing for removing the sealed case, the connection end side outer peripheral surface of the new tubing, previously, the outer peripheral surface of the existing pipe and
A collar having a sealing member for sealing between, joint
Guy to be fitted on the inner peripheral side of the seal material attached to the wheel
De cylinder and was held movably in the pipe axis direction Rutotomoni,
Set the maximum pull-out position of the connecting ring to the outside of the connection end side and outside of the cut end side.
Withdrawal amount restricting means for restricting to a predetermined connection position over the peripheral surface
The provided, after fitting the new tubing which collar is held in ablation position, or the collar and the guide tube at a predetermined connecting position
Pull out to the existing pipe side with the outer peripheral surface of the connection end side and the outside of the cut end side.
Externally fit over the peripheral surface, and then the guide tube is
Specially, it is pulled out from the sealing material of the connecting ring along the outer peripheral surface.
Connection method of the new tubing to the butterflies.