JP4562057B2 - Removal method of split T-shaped pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a split T-shaped pipe removal method for removing a split T-shaped pipe attached to, for example, a water pipe main pipe without stopping the flow of the water pipe main pipe.
[0002]
[Prior art]
For example, a branch pipe connected to a fluid pipe such as a water pipe via a split T-shaped pipe may need to be removed for some reason after construction. In this case, the flow of tap water in the fluid pipe It is necessary to close the branch port without stopping the operation, that is, in the state of constant water.
[0003]
The present applicant has developed a closing device that closes the branch port of the fluid pipe in order to remove the split T-shaped pipe from the fluid pipe, and has already filed a patent application (see JP-A-11-82852).
[0004]
11A is a cross-sectional view of a conventional closing device showing a state in which the packing is inserted into the branch port on the side of the fluid pipe, and FIG. 11B is a cross-sectional view of the packing inserted in the branch port inside the fluid pipe. It is AA sectional drawing of (a) which shows the latching plate hold | maintained, (c) is the conventional which shows the state by which the packing inserted in the branch port by the side of a fluid pipe is expanded and held by a latching plate. It is sectional drawing of the obstruction | occlusion apparatus.
[0005]
According to this type of conventional split-T pipe removal method, water flows to the branch pipe side by a water control valve attached to the split-T pipe attached to the water main pipe 01 around the branch port 01a. After removing the branch pipe and attaching the mounting device (not shown) of the closing device D, the small diameter male screw 06 of the closing device D is screwed onto and supported by the tip of the rod of the mounting device, and the nut 014 is attached. Loosen and move the entire presser piece 02 downward so that the packing 023 is not compressed.
[0006]
Next, the tip of the push rod of the mounting device (not shown) is inserted into the shaft hole 08 of the operation shaft 03a, and the operating piece 015 is pushed down to the lower limit position against the compression coil spring 017, thereby both guides of the operating piece 015 being guided. Each locking plate 018 slidably in contact with the surface 015c is drawn inward until it comes into contact with the tension coil spring 020 and is received in the guide groove 011 of the packing support piece 05.
[0007]
In this state, the entire closing device D is inserted into the branch port 01a, the packing presser 012 is brought into contact with the outer peripheral surface of the water main pipe 01, and then the nut 014 is rotated to pull up the entire presser piece 02 at the same time. The operating piece 015 that has been pressed is released. Then, the packing 023 is compressed by the enlarged diameter portion (not shown) of the packing support piece 05 and the packing presser 012, and the outer peripheral surface thereof is pressed against the branch port 01 a to be closed.
[0008]
On the other hand, when the operating piece 015 is pushed up to the upper limit position by the urging force of the compression coil spring 017, each locking plate 018 slides on the guide surface 015c of the operating piece 015 against the tension coil spring 020. Thus, even if the leading end protrudes by the guide groove 011 of the packing support piece 05 and the pulling force from the branch port 01a acts on the closing device D, both the locking plates 018 are moved. By being engaged with the inner peripheral surface of the water main pipe 01, it is prevented from coming off.
[0009]
[Problems to be solved by the invention]
However, in the above-described conventional closing device D, both the right and left locking plates are used to insert the packing 023 through the branch port 01a of the water main pipe 01 and to lock the packing 023 in the water main pipe 01 after insertion. The 018s are urged so as to be attracted to each other via the tension coil spring 020, and the diameter is expanded and reduced in the radial direction by sliding on the slope of the slide plate 015a of the operation piece 015 formed in a triangular shape in side view. It is configured.
[0010]
Accordingly, since the number of parts constituting the closing device D increases and the structure becomes complicated, not only assembly and adjustment work become difficult, but both the locking plates 018 are radially expanded and contracted. Since the locking plate 018 is configured to slide on the slope of the slide plate 015a of the operating piece 015, the contact surface has a frictional resistance, so a material with a low friction coefficient is used. Even if a foreign substance enters the contact surface or chemically changes, the coefficient of friction between the contact surfaces increases, so that the transmission efficiency for expanding and reducing the diameter deteriorates, and both locking plates 018 and slide plates 015a The proper action of the tension coil spring 020 and the compression spring 017 that urge the pressure cannot be obtained, and the mounting property of the packing 023 is poor and the water stoppage becomes unstable.
[0011]
The present invention has been made paying attention to such problems, and has a simple structure, can reliably block a branch port, and can be used to remove a split T-shaped tube that can provide stable water-stopping. The purpose is to provide.
[0012]
[Means for Solving the Problems]
In order to achieve the object, the split T-shaped tube removal method of the present invention is a method of removing a split T-shaped tube having a partition valve device at a branch port formed in a fluid pipe and connected to the branch pipe. There,
The annular core attached to the branch port comprises a metal cylinder whose outer peripheral surface is coated with an elastic body, and an engaging portion having an annular protruding piece that contacts the branch port is formed at an end thereof. A gripping body that is elastically deformable is disposed between one clamping member and the other clamping member at the distal end of the insertion machine, and the annular core is inserted through the gripping body, and the other The flange formed on the outer peripheral end of the clamping member is fixed in a state where it is in contact with the end face of the annular core, the branch valve device is closed, the branch pipe is removed, and the insertion machine is attached instead. and then, by opening the gate valve to advance the insertion machine, said annular core to an annular protruding piece of said annular core is brought into contact with the branch opening is inserted into the branch opening, the ends of subsequent said grippers By clamping operation of the arranged clamping member Swelled the serial gripper, wherein the portion other than the engaging portion of the annular core from the inside toward the outside and expanded while elastically deformed, the inner surface of the tip portion of the annular core by plastically deforming a fluid pipe And the middle part of the annular core is brought into close contact with the inner periphery of the branch port, and then the insertion machine is removed, and finally the stopper is attached to the engagement portion with a water seal to close the branch port. It is characterized by doing.
According to this feature, the annular core in which the outer peripheral surface of the metal cylinder having the engagement portion provided at the end is swelled at the branch port of the fluid pipe bulges, and the metal cylinder is Since the elastic body is supported in close contact between the branch port and the metal cylinder body by plastic deformation, the sealing effect is more reliable, and the engaging portion of the annular core is not subjected to plastic deformation. Can be attached to a water seal on an annular core. In addition, the structure is extremely simplified as compared with a conventional closing device of this type, and since there is no sliding portion, it can be reliably closed by a simple operation without being affected by the friction coefficient.
Moreover, since the metal cylinder is bulged by the elastically deformable gripping body, the annular core can be bulged uniformly.
Further, since the gripping body bulges by the clamping operation of the clamping members arranged at both ends thereof, the gripping body can be bulged with a simple configuration, and the operability of the closing operation is good.
Furthermore, since the tip of the annular core is also closely locked to the inner surface side of the fluid pipe, the sealing performance is higher and more reliable, and the axial movement of the annular core is also restrained. However, it is difficult for the annular core to loosen.
[0013]
In the method of removing the split T-shaped tube of the present invention, the engaging portion is constituted by a female screw, and a branch body having a male screw threaded on the outer periphery is screwed onto the female screw so as to close the branch port. This is preferable.
By doing in this way, it can seal reliably with the plug body screwed by the cyclic | annular core.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing a partial cross section of an insertion means according to an embodiment of the present invention, FIG. 2 is a side sectional view of a split T-shaped tube, and FIG. 3 shows an insertion means with an annular core attached to the split T-shaped tube. FIG. 4 is an explanatory view showing a state where the annular core is inserted into the branch port of the fluid pipe by the inserting means, and FIG. 5 is an explanatory view showing the state where the annular core is inserted into the branch port of the fluid pipe by the inserting means. FIG. 6 is an explanatory view showing a state where the annular core is mounted by expanding the diameter in the branch port, and FIG. 7 is a state where the insertion means is retracted after the annular core is mounted in the branch port. FIG. 8 is an explanatory view showing a state in which the annular core is inserted into the branch port of the fluid pipe by the inserting means, and FIG. 9 is an explanatory view showing a state in which the annular core inserted into the branch port is expanded by the gripping portion and attached. Fig. 10 shows the stopper attached to the annular core attached to the branch port. It is an explanatory view showing a state where screwed.
[0018]
As shown in FIGS. 1 and 2, reference numeral 1 denotes an insertion device that serves as an insertion means for an annular core B mounted on the inner periphery of a branch port 38 a formed on the side surface of a fluid pipe 38 such as a water pipe main pipe. The insertion device 1 is shown as being attached to an attachment plate 27 connected via an adapter 28 having a hollow hole 29 to be attached to a connection portion F of a split T-shaped tube G, which will be described later, and fixed to the back surface of the attachment plate 27. The both ends of the front support plate 10 and the rear support plate 14 disposed behind the front support plate 10 are rotatably connected to each other by a rod-like connection member 26 that maintains a predetermined distance between the front support plate 10 and the rear support plate 14. A feed screw 16 that is pivotally supported and has an operation handle 25 attached to the rear end side, and a cylindrical nut 20 that is inserted into and screwed into the feed screw 16 are provided at one end, and a hydraulic cylinder 4 that operates a grip portion 2 described later is provided. Install on the back and on the other end A movable plate 15 fitted with a guide bush (not shown) that slidably guides and holds the coupling member 26 is inserted, and the rear end is connected to the end of the hydraulic cylinder 4 and the front side is connected to the front support plate 10 or the mounting plate 27. A hollow tube 3 that is slidably held and has a grip portion 2 attached to the front end, and a rear end that is housed in the hollow tube 3 is connected to a piston (not shown) of the hydraulic cylinder 4 and the front end is gripped. Actuation rod 5 as an advancing / retracting member which is connected to the pinching shaft 30 in the portion 2 and is held non-rotatable by the engagement between the guide groove 7 formed in the axial direction and the pin 8 protruding inside the hollow tube 3. It consists of and.
[0019]
Here, the annular core B mounted around the branch port 38a formed on the side surface of the fluid pipe 38 such as a water pipe main pipe is a female screw as an engaging portion at the inner peripheral end of the metal cylinder M. T is screwed, and an annular protruding piece Ma is formed at the outer peripheral end portion thereof, and an elastic coating L, which is an elastic body having a predetermined thickness, is attached so as to surround the outer periphery of the cylindrical body M. The outer diameter of L is slightly smaller than the inner diameter of the branch port 38a.
[0020]
More specifically, the grip portion 2 that grips the annular core B is inserted through a sandwiching member 34 fixed to the distal end of the hollow tube 3 and a sandwiching member 34 screwed to the distal end of the operating rod 5, and elastic such as rubber. A holding shaft 30 for inserting and holding a gripping body 35 that is a cylindrical member having a diameter that can be inserted into the inner diameter of the annular core B with a material, and one holding member 34 that is fixed to the tip of the holding shaft 30. A holding member 32 for holding both ends of the gripping body 35 between them. One holding member 32 has an outer diameter substantially the same as the outer diameter of the gripping body 35 through which the inner diameter of the annular core B can be inserted. The other sandwiching member 34 is formed with a circular protrusion having a diameter slightly larger than the outer diameter of the gripping body 35, and a flange 34a is formed at the outer peripheral end.
[0021]
When the annular core B configured as described above is artificially inserted from the front of the gripping portion 2 until the end portion comes into contact with the flange 34a of the clamping member 34, the annular core B is formed on the inner periphery of the end portion of the annular core B. The screw T corresponds to the circular protrusion of the clamping member 34.
[0022]
Therefore, when a piston (not shown) of the hydraulic cylinder 4 is operated, the operating rod 5 is pulled, and the gripping body 35 is compressed in the axial direction by the pair of clamping members 32 and 34, whereby the gripping body 35 bulges in the radial direction. Is configured to do.
[0023]
Next, a method for removing the split T-shaped tube of the present invention will be described.
[0024]
First, as shown in FIG. 2, the gate valve device V of the split T-shaped tube G is closed, the flange 36 a of the branch pipe 36 is removed from the connecting portion F of the split T-shaped tube G, and the annular core B is removed. Then, it is artificially inserted into the grip portion 2 of the insertion device 1 from the front.
[0025]
Therefore, as shown in FIG. 3, the insertion device 1 is attached to the connection portion F of the split T-shaped tube G via the adapter 28, and in this state, the grip portion 2 is located at the retracted position.
[0026]
Next, as shown in FIG. 4, the hydraulic cylinder 4 is held by opening the gate valve device V of the split T-shaped tube G and rotating the feed screw 16, for example, clockwise by operating the handle 25. The movable plate 15 is moved forward by being guided by the connecting member 26, and the grip portion 2 fitted with the annular core B at the tip of the hollow tube 3 connected to the end of the hydraulic cylinder 4 is connected to the split T-shaped tube G. And is inserted into a branch port 38a of a fluid pipe 38 such as a water pipe main pipe.
[0027]
Next, in FIG. 5, the handle 25 is operated until it reaches the state shown in FIG. It is confirmed that is in contact with the branch port 38 a of the fluid pipe 38. In this state, as shown in FIG. 8, a minute gap is formed between the outer periphery of the elastic coating L of the annular core B and the inner periphery of the branch port 38a.
[0028]
When the insertion of the annular core B is confirmed, as shown in FIG. 6, the hydraulic cylinder 4 is actuated to move the piston backward and the operating rod 5 is pulled, so that one of the holding members 32 shown in FIG. Moves backward together with the operating rod 5, and the gripping body 35 is pressed between the clamping members 32 and 34 at both ends thereof. Therefore, the gripping body 35 is swelled in the radial direction, and the diameter of the annular core B attached to the gripping body 35 is expanded while elastically deforming from the inside to the outside by this bulging output, and the internal metal cylinder body As shown in FIG. 9, the tip of the annular core B is greatly plastically deformed and closely adheres to the inner surface of the fluid pipe 38, and the intermediate portion of the annular core B is closely attached to the inner periphery of the branch port 38a. Secured.
[0029]
When the mounting of the annular core B is completed, the hydraulic cylinder 4 is actuated to move the piston forward, the actuating rod 5 is advanced to reduce the diameter of the gripping body 35 to the original state, and the handle 25 is rotated counterclockwise. As shown in FIG. 7, in the state where the grip portion 2 is moved backward together with the moving plate 15 holding the hydraulic cylinder 4 and returned to the original position, the gate valve device V of the split T-shaped tube G is moved. Put it in a blocked state.
[0030]
Therefore, the insertion device 1 is removed from the connection portion F of the split T-shaped tube G, and a plug body mounting device which is a known plug body mounting means (not shown) supporting the plug body 40 in place of the insertion device 1 is replaced with the split T-shaped tube. As shown in FIG. 10, the annular core B is securely closed by attaching the plug body 40 to the female thread T of the annular core B, as shown in FIG. . Next, the split T-shaped tube G is removed from the branch port 38a of the fluid tube 38, and the split T-shaped tube removal operation is completed.
[0031]
Thus, according to the method of removing the split T-shaped tube of the present invention, the elastic coating L is formed on the outer periphery of the metal cylinder M in which the female screw T is screwed to the branch port 38a of the fluid pipe 38. The ring-shaped core B is attached in a liquid-tight manner by plastic deformation in a state where the diameter is expanded, and then the plug body 40 is screwed onto the female thread T portion of the ring-shaped core B so as to be closed. Not only is the structure of the insertion device 1 extremely simplified, but since there is no sliding part as in the conventional mounting device, the insertion device 1 can be reliably closed with a simple operation without being affected by the friction coefficient, and stable. Water stoppage can be obtained.
[0032]
Furthermore, since the cylindrical gripping body 35 inserted into the annular core B can be expanded and contracted by moving the operating rod 5 forward and backward, the operability of the insertion device 1 is simplified, The annular core B can be securely attached to the inner periphery of the branch port 38a.
[0033]
Further, the inner periphery of the branch port 38a is restrained in the axial direction only by pressing the inner diameter portion of the annular core B outward except for the female screw T portion to which the plug body 40 of the annular core B is screwed. So that the female screw T can be mounted without damaging it.
[0034]
As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration of the present invention is not limited to this, and the present invention may be modified or added without departing from the scope of the present invention. included. For example, in this embodiment, the example in which the female thread T is provided in the engaging portion of the annular core B and the plug body 40 is engaged by being screwed thereto is shown, but the present invention is not limited to this. A taper hole may be formed in the taper, and a stopper formed in a taper shape may be fitted into the taper hole and sealed with water.
[0035]
【The invention's effect】
The present invention has the following effects.
[0036]
According to the invention 請 Motomeko 1, the branch port of the fluid tube, an annular core which the outer peripheral surface of the metallic cylindrical body engaging portions are provided on the end portion is adhered an elastic body bulges, metal Since the cylindrical body is plastically deformed, the elastic body is supported in a close contact state between the branch port and the metal cylindrical body, and the sealing effect is more reliable, and the engaging portion of the annular core is not subjected to plastic deformation. Therefore, the stopper can be attached to the annular core with a water seal. In addition, the structure is extremely simplified as compared with a conventional closing device of this type, and since there is no sliding portion, it can be reliably closed with a simple operation without being affected by the friction coefficient.
Moreover, since the metal cylinder is bulged by the elastically deformable gripping body, the annular core can be bulged uniformly.
Further, since the gripping body bulges by the clamping operation of the clamping members arranged at both ends thereof, the gripping body can be bulged with a simple configuration, and the operability of the closing operation is good.
Furthermore, since the tip of the annular core is also closely locked to the inner surface side of the fluid pipe, the sealing performance is higher and more reliable, and the axial movement of the annular core is also restrained. However, it is difficult for the annular core to loosen.
[0037]
According to the invention 請 Motomeko 2, can be reliably water sealed by a plug body which is screwed to the annular core.
[Brief description of the drawings]
FIG. 1 is a side view showing a partial cross section of an insertion means according to an embodiment of the present invention.
FIG. 2 is a side sectional view of a split T-shaped tube.
FIG. 3 is an explanatory view showing a state at a stage where an insertion means having an annular core attached to a split T-tube is attached.
FIG. 4 is an explanatory view showing a state in which an annular core is inserted into a branch port of a fluid pipe by insertion means.
FIG. 5 is an explanatory view showing a state in which the annular core is inserted into the branch port of the fluid pipe by the inserting means.
FIG. 6 is an explanatory view showing a state where the annular core is mounted by expanding the diameter in the branch port.
FIG. 7 is an explanatory view showing a state in which the insertion means is retracted after the annular core is mounted in the branch port.
FIG. 8 is an explanatory view showing a state in which the annular core is inserted into the branch port of the fluid pipe by the inserting means.
FIG. 9 is an explanatory view showing a state where the annular core inserted into the branch port is mounted with the diameter expanded by the gripping portion.
FIG. 10 is an explanatory view showing a state in which a stopper is screwed onto an annular core attached to a branch port.
11A is a cross-sectional view of a conventional closing device showing a state where a packing is inserted into a branch port on the side of the fluid pipe, and FIG. 11B is a diagram showing a state where the packing inserted into the branch port is held inside the fluid pipe. It is AA sectional drawing of (a) which shows the locking plate to perform, (c) is the conventional obstruction | occlusion which shows the state by which the packing inserted in the branch port by the side of a fluid pipe is expanded-diametered by a locking plate It is sectional drawing of an apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insertion device 2 Gripping part 3 Hollow tube 4 Hydraulic cylinder 5 Actuation rod (advance / retreat member)
7 Guide groove 8 Pin 10 Front support plate 14 Rear support plate 15 Moving plate 16 Feed screw 20 Nut 25 Operation handle 26 Connecting member 27 Mounting plate 28 Adapter 29 Hollow hole 30 Holding shaft 32 Holding member 34 Holding member 34a Flange 35 Holding body 36 Branch pipe 36a Flange 38 Fluid pipe 38a Branch port 40 Plug body B Annular core D Closure device F Connection part G Split T-shaped pipe L Elastic coating (elastic body)
M Metal cylinder Ma Annular protruding piece T Female thread (engagement part)
V Gate valve device

Claims (2)

A method for removing a split T-shaped pipe having a gate valve device connected to a branch pipe at a branch port formed in a fluid pipe,
The annular core attached to the branch port comprises a metal cylinder whose outer peripheral surface is coated with an elastic body, and an engagement portion in which an annular projecting piece abutting on the branch port is formed at an end thereof. A gripping body that is elastically deformable is disposed between one clamping member and the other clamping member at the distal end of the insertion machine, and the annular core is inserted through the gripping body, and the other The flange formed on the outer peripheral end of the clamping member is fixed in a state where it is in contact with the end face of the annular core, the branch valve device is closed, the branch pipe is removed, and the insertion machine is attached instead. and then, by opening the gate valve to advance the insertion machine, said annular core to an annular protruding piece of said annular core is brought into contact with the branch opening is inserted into the branch opening, the ends of subsequent said grippers By clamping operation of the arranged clamping member Swelled the serial gripper, wherein the portion other than the engaging portion of the annular core from the inside toward the outside and expanded while elastically deformed, the inner surface of the tip portion of the annular core by plastically deforming a fluid pipe And the middle part of the annular core is brought into close contact with the inner periphery of the branch port, and then the insertion machine is removed, and finally the stopper is attached to the water seal in the engagement portion to close the branch port. A method for removing a split T-shaped tube, characterized by:   The split T-shaped tube according to claim 1, wherein the engaging portion is configured by a female screw, and a branch port is closed by screwing a plug body having a male screw on an outer periphery thereof to the female screw. Removal method.

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