JPH0763279A - Extracting method for seal plug and tube - Google Patents

Abstract

PURPOSE:To insert/extract/fix a plug member in a tube member according to a state of usage by inserting a presser shaft inside a seal packing having up and down two chambers and making a moving position adjustable. CONSTITUTION:In order to seal a tip of a tube by a seal plug the seal plug is easily inserted to a holding part 22 if a cylinder part 21 of the seal plug is inserted in the tube. A mass part, mounted on a tip of a shaft is moved to a lower chamber 26 from an upper chamber 25 by pushing a shaft part 31 of a presser shaft 3. As a sum of a vertical width of the mass part 32 and a depth of both sides wall of the cylinder part of the lower chamber 26 is larger than an inside diameter of the tube, the cylindrical part 21 is pressed to an inner surface of the tube 4 by the mass part 32 when the mass part 32 moves to the lower chamber 26 and a part between the cylindrical part and the inner surface of the tube 4 becomes water tight. To extract the seal plug the mass part 32 moves to the upper chamber by holding a cord 39 and pulling the shaft part 31. Then the cylindrical part 21 can be extracted from the tube easily because there is no mass part 32 pushed the cylindrical part 21 of the lower chamber 26 from inside there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal stopper and a method for pulling out a tube using the seal stopper.
In detail, it is difficult to pull out during the construction, and it is easy to pull out after the construction is completed.The tip of the pipe is to be replaced when updating the pipe provided in the sheath pipe that is piped by the header pipe method. The present invention relates to a pipe withdrawing method in which the seal plug is used to withdraw the pipe.

[0002]

2. Description of the Related Art Conventionally, there is a sheath header type piping method as one type of piping method for piping in a building. With this sheath pipe header type piping method, the sheath pipe is buried in advance in the slab floor etc. during the construction work of the building, and at the time of facility construction at a later date, pipes such as water supply pipes are passed through this existing sheath pipe, This is a method of connecting both ends of this pipe to the header on the main pipe side and the water tap (faucet) side, respectively. (See Japanese Examined Patent Publication No. 5-45729) Then, when it becomes necessary to renew the pipe in the sheath pipe that is piped by this sheath pipe header type piping method, the pipes on the header side and the hydrant side are connected. After removing and pulling out the tube in the sheath tube, a new tube was passed through the sheath tube.

[0003]

However, when the pipes on the header side and the faucet side are disconnected and the pipe in the sheath pipe is pulled out, water is still contained in the pipe, so the pipes are pulled out. In the meantime, the water in the tube flows out into the sheath tube. And the water that flowed into this sheath tube could not be easily drained, so I passed through a new tube with the water remaining inside this sheath tube. However, when a new tube is passed through while the water remains in the sheath tube, the heat retention is poor, and in the worst case, there is a problem that the tube is frozen and the sheath tube is damaged.

Therefore, the present inventor tried to pull out an old pipe by sealing one end of the pipe with a rubber stopper so that water in the pipe did not come out. Since the end portion of the plug easily expands, there is a problem that the plug easily comes off. On the contrary, if the stopper is strongly closed so as not to come off, this time there is a problem that it is difficult to remove the stopper after the construction is completed. Therefore, an object of the present invention is to provide a seal plug that is difficult to pull out during construction and is easy to pull out when construction is completed, and a pipe withdrawal method for pulling out a pipe using this seal plug.

[0005]

The present invention has been made in order to achieve the above object, and the seal plug of the present invention is inserted into a seal packing made of an elastic body and the seal packing. A seal plug for sealing a tube consisting of a holding shaft, wherein the seal packing has a bottomed cylindrical tube part having a size that fits into the tube, and an upper end of the cylindrical part is laterally larger than the inner diameter of the tube. It consists of a protruding locking part,
An upper chamber and a lower chamber are formed by bundling the substantially central portion of the cylindrical portion, and a thick pressing portion is provided on a side wall of the lower chamber, and the pressing shaft includes the shaft portion and the shaft portion. It consists of a lump provided at the tip, the shaft part protrudes upward from the locking part, and the lump is inserted so as to reciprocate between the upper chamber and the lower chamber. The total thickness of both side walls of the pressing portion contacting the lump is larger than the inner diameter of the tube.

The pipe withdrawing method of the present invention is a pipe withdrawing method in which the pipe provided in the sheath pipe is withdrawn, and the tubular portion of the seal plug is inserted into the distal end portion of the pipe and protrudes upward from the engaging portion. Push the shaft part of the holding shaft downward to move the lump to the lower chamber of the seal packing, press the pressing part of the lower chamber against the inner surface of the pipe by this lump, and seal the tip of the pipe watertight. Is pulled out from the inside of the sheath pipe, then the shaft portion of the pressing shaft is pulled upward to move the lump portion to the upper chamber of the seal packing, and the seal plug is removed from the pipe.

In the present invention, a thick pressing portion is provided on the side wall of the lower chamber of the tubular portion, but the pressing portion may have a thick side wall. For example, the entire side wall may be thick, a ridge protruding like a headband, or a ridge protruding like a wedge in the circumferential direction.

[0008]

The operation of the present invention will be described by a method of pulling out the tube provided in the sheath tube using a seal plug. First, after stopping the main plug, disconnect the header side pipe and the faucet side pipe. Next, the tubular portion of the seal stopper is inserted into the tip of the header-side or faucet-side tube. Then, the tube part is sized to fit inside the tube, and the locking part attached to the upper end of this tube part protrudes to the side larger than the inner diameter of the tube. You can

Next, the shaft portion of the pressing shaft protruding upward from the locking portion is pushed downward to move the lump to the lower chamber.
When this block enters the lower chamber, the sum of the horizontal width of the block and the thickness of both side walls of the pressing part in contact with this block is larger than the inner diameter of the pipe, and this seal packing (pressing part) is elastic. Since there is a body, the horizontal dimension of the pressing portion becomes larger than the inner diameter when the lump portion enters, and the pressing portion strongly presses the inner surface of the pipe while being compressed, and this portion becomes watertight. Moreover, since this pressing part is provided in the lower chamber of the tubular part that is inserted inside the pipe, the part that is pressed enters the inside by the distance that the tubular part is inserted, not the tip of the pipe. Become a place. Therefore, since the portion slightly inserted from the tip of this pipe is difficult to spread, the seal plug will not come off.

After sealing the tip of the tube with this seal plug, the tube is pulled out by pulling it on the opposite side of the tube. Since the seal plug does not come off when the tube is pulled, the tube can be pulled out without water flowing into the sheath tube.

Next, the seal plug of the pipe thus pulled out is removed. In this method of removing the seal plug, the shaft portion protruding from the locking portion is pulled, and the lump portion provided at the tip of the shaft portion is moved to the upper chamber. Then, since the lump part is pulled out from the thick pressing part of the lower chamber, the seal plug can be easily pulled out from the pipe. After pulling the old tube out of the sheath tube in this way and inserting the new tube into the sheath,
Since there is no water in the sheath tube, the new tube is kept warm and the tube is not damaged by freezing.

[0012]

EXAMPLES Examples of the present invention will be described below. 1 to 5 show an embodiment of the present invention, FIG. 1 is an explanatory view showing a seal plug, FIG. 2 is an explanatory view showing a state in which the seal plug is inserted into an end portion of a pipe, and FIG. 3 is a block portion. Is an explanatory view showing a state in which it is moved to a lower chamber, FIG. 4 is a piping diagram showing an overall image of piping performed by a sheath pipe header type piping method, and FIG. 5 is an explanatory view showing a portion between the header and the faucet of FIG. . FIG. 6 shows another embodiment of the present invention and is an explanatory view showing a seal plug.

1 to 5, reference numeral 1 denotes a seal plug, and the seal plug 1 is a seal packing 2 which is an elastic body made of synthetic rubber, and a steel holding shaft inserted in the seal packing 2. 3 and 3. Seal packing 2
Is composed of a tubular portion 21 having a bottomed tubular shape that fits inside the tube 4, and a locking portion 22 that protrudes laterally at the upper end of the tubular portion 21 and that is larger than the inner diameter of the tube 4. The tubular portion 21 is composed of an upper chamber 25 and a lower chamber 26, the central portion of which is constricted and communicated with each other. The side wall of the lower chamber 26 has a pressing portion 27 formed of two thick ridges.
Is provided.

The pressing shaft 3 comprises a shaft portion 31 and a lump portion 32 provided at the tip of the shaft portion. Then, the shaft portion 31 projects upward from the locking portion 22, and the lump portion becomes the upper chamber 2.
The pressing shaft 3 is inserted into the seal packing 2 so as to reciprocate between the lower casing 5 and the lower chamber 26. The horizontal width of the lump 32 and the thickened portion 27 in contact with the lump 32
And the total thickness of both side walls is larger than the inner diameter of the tube 4. 39 is a shaft portion 3 so that the pressing shaft 3 can be easily pulled.
It is a string attached to the tip of 1.

Reference numeral 5 is a sheath pipe, and this sheath pipe 5 is a slab bed 6
Is embedded in the slab floor 6 when the is installed. The tube 4 is inserted into the sheath tube 5. Reference numeral 7 is a header, and this header 7 is connected to a water main. One end of the pipe 4 is connected to the header 7, and the other end is connected to various water taps 8 such as a water heater 81, a bath tap 82, a sink tap 83, and a sink tap 84.

Next, a method of renewing the tube 4 in the sheath tube 5 using this seal plug will be described. First, the main plug is stopped to prevent water from flowing out, and then the header 7 or the water tap 8 and the pipe 4 are disconnected. Next, the tip of either the header 7 side or the water tap 8 side of the pipe 4 is closed with the seal plug 1.

A method of closing the tip of the pipe 4 with the seal plug 1 will be described. First, the tube portion 21 of the seal plug 1 is attached to the pipe 4.
Insert inside. Then, the tubular portion 21 is sized to fit inside the tube 4, and the locking portion 2 provided at the upper end of the tubular portion 21.
Since 2 is larger than the inner diameter of the pipe 4, the locking portion 22 can be easily inserted. Next, the shaft portion 31 of the pressing shaft 3 protruding upward from the locking portion 22 is pushed downward to move the shaft 3
The lump portion 32 provided at the tip of 1 is moved from the upper chamber 25 to the lower chamber 26.

Since the sum of the horizontal width of the lump portion 32 and the thickness of both side walls of the pressing portion 27 is larger than the inner diameter of the pipe 4, when the lump portion 32 moves to the lower chamber 26, the pressing portion 27 moves into the lump portion 32.
It is pressed against the inner surface of the tube 4 and compressed by it, so that the space between the pressing portion 27 and the inner surface of the tube 4 becomes watertight. At this time, the lower chamber 2 of the tubular portion 21 in which the pressing portion 27 is inserted inside the pipe 4
6, the portion of the pipe 4 to be pressed does not easily spread at a place slightly entering from the end of the pipe, and therefore the seal plug is hard to come off.

After sealing one end of the tube 4 in this manner, the tube 4 is pulled out and pulled out. Even if the pipe 4 is pulled out in this way, the seal plug 1 does not come off, so that the water in the pipe 4 does not spill into the sheath pipe 5. Next, the seal plug 1 attached to the tip of the tube 4 is pulled out and removed. In order to remove the seal plug 1, first, the cord 39 is held and the shaft portion 31 protruding from the locking portion 22 is pulled. Then, shaft 3
The lump 32 provided at the tip of 1 moves to the upper chamber 25.

Then, the lump portion 32 pressing the pressing portion 27 from the inside disappears, so that the tubular portion 21 can be easily pulled out from the tube 4. After removing the tube 4 from the sheath tube 5 in this manner, a new tube can be inserted into the sheath tube 5 to renew the tube. And since water does not spill into the sheath tube 5, the new tube is kept warm, and therefore the new tube is not damaged by freezing.

Next, the embodiment shown in FIG. 6 will be described. When the embodiment shown in FIG. 6 is compared with the embodiment shown in FIGS. 1 to 5, the shape of the pressing portion 27a provided on the side wall of the lower chamber 26a of the seal plug 1a is different, and the others are shown in FIGS. This is the same as the example shown. 1 to 5 that the pressing portion 27a has a shape protruding like a claw in the circumferential direction.
Different from the embodiment shown in FIG. Other than that, the method of use and the operation are almost the same.

[0022]

As described above, according to the seal plug of the present invention, the lump portion is inserted so as to reciprocate between the upper chamber and the lower chamber, and when the lump portion moves to the lower chamber, the lump portion is moved. Since the total of the horizontal width of and the thickness of both side walls of the pressing part provided in the lower chamber is made larger than the inner diameter of the pipe,
When the lump is moved to the lower chamber, the lump presses the pressing portion against the inner surface of the pipe, making this portion watertight. Since this pressing portion is not the tip of the pipe but the place where it enters inside, this portion does not spread and the seal is complete.

Since it can be completely sealed in this way, when the pipe is pulled out from the sheath pipe, water does not spill into the sheath pipe, and therefore the heat of the renewed pipe is good and there is no damage due to freezing, which is convenient. . Also, it is convenient to move the lump to the upper chamber because the seal plug can be easily pulled out and removed. As described above, the seal plug of the present invention is a seal plug that does not come off during construction and can be easily removed after the construction is completed. It is convenient to renew the tube inside because the new tube has good heat retention and there is no damage due to freezing.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a seal plug according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a seal plug is inserted into an end portion of a tube.

FIG. 3 is an explanatory diagram showing a state in which a lump has moved to a lower chamber.

FIG. 4 is a piping diagram showing the entire piping carried out by a sheath header type piping method.

FIG. 5 is an enlarged view showing a space between the header and the water tap.

FIG. 6 is an explanatory view showing a seal plug according to another embodiment of the present invention.

[Explanation of symbols]

 1, 1a Seal plug 2 Seal packing 21 Cylinder part 22 Locking part 25 Upper chamber 26, 26a Lower chamber 27, 27a Pressing part 3 Holding shaft 31 Shaft part 32 Lump part 4 Pipe 5 Sheath pipe 6 Slab floor 7 Header 8 Water tap

Claims (2)

[Claims] 1. A seal plug for sealing a tube consisting of a seal packing made of an elastic body and a holding shaft inserted in the seal packing, wherein the seal packing has a size to fit in the tube. It consists of a bottom cylinder and a locking part that protrudes laterally larger than the inner diameter of the pipe at the upper end of the cylinder. The cylinder has a substantially central portion constricted to form an upper chamber and a lower chamber. A thick pressing portion is provided on the side wall of the lower chamber, the pressing shaft includes a shaft portion and a lump portion provided at the tip of the shaft portion, and the shaft portion is the locking portion. The lump is inserted so as to reciprocate between the upper chamber and the lower chamber, and the horizontal width of the lump and the total thickness of both side walls of the pressing portion in contact with this lump are A pipe sealing plug characterized by being made larger than the inner diameter. 2. A pipe withdrawing method for withdrawing a pipe provided in a sheath pipe, wherein the tubular portion of the seal plug according to claim 1 is inserted into the distal end portion of the pipe, and the pipe is projected upward from the locking portion. Press the shaft of the holding shaft downward to move the lump to the lower chamber of the seal packing, press the pressing part of the lower chamber against the inner surface of the pipe with this lump, and seal the tip of the pipe watertight, A method of withdrawing a pipe, which is characterized in that the pipe is pulled out from the inside of the sheath pipe, then the shaft portion of the pressing shaft is pulled upward to move the lump to the upper chamber of the seal packing, and the seal plug is removed from the pipe.