JPH0333954B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly involves injecting glycol liquid into conduits such as gas conduits that are buried underground, embedded in building walls, or hidden. This may cause the pipe joints to swell over time and improve the sealing properties of the joints, or excess liquid may accumulate in the pipes or may enter the pipes due to various pipe work such as sandblasting or due to damage. In other words, the liquid is injected into the conduit through a flexible tube inserted into the branch pipe from the exposed open end of the branch pipe connected to the conduit. The present invention relates to a method for draining liquid in a conduit.

For example, the conventionally known method for injecting glycol liquid into a conduit is to expose the local part of the conduit by excavating the road surface or destroying the buried wall, and then This method involves drilling or cutting the exposed conduit portion and inserting the injection tube into the conduit, and then injecting the glycol liquid.
Furthermore, it requires extensive labor and time-consuming on-site construction work such as drilling and cutting, which has the disadvantage of being inefficient and increasing construction costs.Especially in the case of buried pipes that require excavation, it is difficult to carry out heavy pavement work. It was extremely difficult to implement this in areas with heavy traffic.

Another conventional method is a flow-down method in which liquid is injected through the branch pipe, but in this case, the branch pipe has many steps, turns, and threads inside the pipe, like those found in gas supply pipes. In addition, if the pipe is complex with many joints such as mechanical joints, elbows, and valve tees, and many sharp bends, some of the injected liquid may accumulate in the branch pipe, resulting in a large amount of liquid loss. However, there was a drawback that it had a significant negative impact on the distribution of gas, etc. within the branch pipe after injection work.

In view of these circumstances, the present invention has been developed to reduce loss within the conduit by utilizing the branch pipes without requiring construction work such as excavation or perforation, even if the conduit is connected to complicated branch pipes as described above. inject the liquid without any problem, and
The purpose is to propose a method that can perform liquid injection or liquid discharge very efficiently.

The feature of the intra-pipe liquid injection or liquid discharge method according to the present invention devised to achieve the above object is that the rounded weight-shaped guide member movable within the branch pipe is replaced with a relatively strong elastic helical wire. The flexible tube is fitted and held on the wire rod, and the flexible tube is A nozzle portion is formed on the tip side of the flexible tube, and an elastic blocking device capable of blocking the branch pipe is fitted around the nozzle portion of the flexible tube, and the wire passing device is placed on the guiding member side. The wire threading tool is inserted into the branch pipe through the exposed open end, and in this inserted state, the wire threading tool is pushed into the branch pipe while applying rotation and vibration to the entire wire threading tool via the spiral wire rod. , the flexible tube is inserted into the branch pipe such that the nozzle part reaches the inside of the conduit, and when the blocking device enters the conduit from the branch pipe, it is determined that the fluid from the conduit enters the branch pipe. This is confirmed by detecting the inflow, and after the confirmation, the liquid is injected into the conduit through the flexible tube or the liquid is discharged from the conduit.

The effects of the method of the present invention having such characteristics are as follows.

In other words, by using a wire threading tool consisting of a spiral wire rod and a weight-shaped guide member arranged in series, the wire threading tool can be inserted into the branch pipe with complicated bends, steps, turns, and screws. Even if there is a part, etc., the roundness of the guiding member and the bending deformation of the helical wire facilitate smooth entry into the pipe, and the weight of the guiding member prevents the tip of the wire threading tool from pointing downwards. Since it is easy to bend and deform, it is easy to move the tip of the wire threading device downward and reach the inside of the conduit.
If the wire gets stuck on the way, it can be moved through the branch pipe while being immediately unhooked by the twisting rotation of the wire passing tool and the reverse rotation and vibration caused by its reaction.

Furthermore, the spiral wire consists of two members,
Since the helical wire rod on the proximal side is made of relatively strong elastic material, the force of pushing the wire threading tool into the branch pipe is easily transmitted to the tip side, and the helical wire rod on the distal side is made of a material with relatively strong elasticity. Since it is made of a material that is less elastic and shorter than the pipe, it is easier to direct the guide member in any direction by following the bending and deformation of the pipe.
It can be easily moved through the bent branch pipe by the weight of the guiding member and the rotating operation of the wire.

As a result, the flexible tube, which is fitted and held in the spiral wire of the wire threading tool, is inserted from the exposed open end of the branch pipe without any work such as excavation, destruction, perforation, or cutting. Insert it easily and quickly by a simple means so that its tip reaches the inside of the conduit, and
Liquid can be injected or drained through the flexible tube.

Moreover, despite the fact that a spiral wire rod and a weight-shaped guide member are installed on the upper side of the nozzle part, which tend to interfere with grasping the position of the nozzle part in the conduit, the interrupter enters the conduit from the branch pipe. By confirming this by detecting the flow of fluid from the conduit into the branch pipe, it is possible to accurately determine the position of the nozzle at that point. The nozzle portion can be placed accurately in a predetermined position within the conduit without causing over-penetration.

Therefore, even if the branch pipe is a bent pipe, the wiring tool can be easily penetrated, so there is no need to go to the trouble of excavating the road surface, and the applicability of the implementation location and target conduit is extremely high. As the size increases, construction costs can be significantly reduced.

Furthermore, since the nozzle part can be placed accurately at a predetermined position within the conduit, for example, glycol liquid can be injected into the conduit to swell the aged pipe joint part and improve the sealing performance of the joint part. Injection of liquid into a predetermined position during work such as draining excess liquid that has accumulated in the pipe, liquid that has entered the pipe due to various pipe construction such as sandblasting, or due to damage, etc. You can reliably perform work and drain the liquid from a predetermined position.

Hereinafter, an embodiment in which the method of the present invention is applied to a method of injecting a glycol liquid for sealing a joint of a buried gas conduit will be described in detail.

Reference numeral 6 denotes a wire running tool used in this implementation. First, to explain this, 3 is a wire connecting tool in the branch pipe 2 connected to the gas conduit 1, in the above-ground vertical pipe 2B having a pot 9 at the upper end, especially a pot. 9 is a cone-shaped guiding member having a rounded shape such as a sphere or an oval, and is large enough to be able to move through the interior of 9, and 4 is a piano wire with relatively strong elasticity and a length of several meters to several tens of meters. The helical wire rod used is structured so that when it is rotated, it accumulates torsional stress in the branch pipe 2, and when the load falls below a certain level, it rotates and vibrates due to the reaction, and it also withstands reuse. It has an elastic strength of Reference numeral 5 denotes a helical wire rod made of piano wire, which has softer elasticity than the wire rod 4 and has a length of about 10 cm (approximately the length of the elbow in the branch pipe 2). Part 3
The wire passing tool 6 is constructed by removably screwing the two ends together, and removably screwing one end of the spiral wire 3 to the other end via the oval connecting fitting 10. A flexible tube 7 made of soft resin is fitted and held on the outside of the wire 4 of the wire passing tool 6, and a rubber-like material is coated with a sponge-like material near the tip of the flexible tube 7. Being held in a pinch,
An elastic shutoff tool 8 is attached that can shut off the branch pipe 2 by elastically coming into close contact with the inner circumferential surface of the branch pipe 2. Furthermore, a nozzle portion 7a for injecting glycol liquid is formed at the tip side of the flexible tube 7.

Next, a method for inserting the flexible tube 7 into the branch pipe 2 through the wire passing tool 6 and injecting the glycol liquid into the conduit 1 through the inserted flexible tube 7 will be listed in order of steps.

(1) Open the upper pot 9 of the above-ground standpipe 2B, and insert the wire passing tool 6 into the above-ground standpipe 2B from the guiding member 3 side through the exposed open end 2A opened by the pot 9.

(2) Manually from the ground in the inserted state,
Alternatively, the wire threading tool 6 is pushed into the branch pipe 2 while mechanically applying rotation or vibration to the entire wire threading tool 6 via the spiral wire rod 4. Of the branch pipes 2, the underground service pipe 2C that connects to the above-ground standpipe 2B has a complicated curved part due to an elbow in the middle thereof, and there are steps and threaded parts on the inner surface, but the above-mentioned The guiding member 3 moves approximately in a circular motion due to the twisting rotation, the restoring motion and the vibration, and the spiral wires 4 and 5 follow the shape of the tube and are deformed, so that the guide member 3 passes through the guide member 3 almost without any hitch. At this time, since the branch pipe 2 is always blocked by the shutoff device 8, gas is prevented from flowing out to the ground side.

(3) The lead-in pipe 2C and the conduit 1 are connected by a tee 2D, and the vicinity of the connecting part therein has an upward curve. Since the wire rod 5 is bent and deformed downward by acting on the wire rod 5, the wire rod 5 does not come to a dead end but advances downward and reaches the inside of the conduit 1. and,
When the blocking tool 8 enters the conduit 1 following the guiding member 3, gas flows into the branch pipe 2, so that it can be confirmed that the wire passing tool 6 has reached the inside of the conduit 1.

(4) Next, the wire passing tool 6 is pulled back and the blocking tool 8 is returned to the position of the chi 2D or the lead-in pipe 2C to block the branch pipe 2 and open the nozzle portion 7a into the conduit 1. At this time, near Kotoku 9, standpipe 2B
By surrounding the outside of the connecting part between the wire passing tool 6 and the wire passing tool 6 in advance with a transparent vinyl gas blowout prevention bag-like cover 11 with a bellows section, it is possible to prevent the wire passing tool 6 from being inserted. It is possible to prevent gas from blowing out when confirming that the tip reaches the inside of the conduit 1.

(5) Connect the above-ground side end of the flexible tube 7 to the liquid supply pump 12
By operating the pump 12 while connected to the glycol liquid tank 13 through the flexible tube 7, the glycol liquid is injected directly into the conduit 1.

(6) After the liquid injection is completed, reverse rotation is applied to the wire threading tool 6 to remove the force applied to the inner surface of the branch pipe 2, while pulling out the wire threading tool 6 and the flexible tube 7. After the extraction is completed,
The series of operations is completed by closing the pot 9.

In addition, when draining excess liquid from the inside of the conduit 1, the pump 12 may be connected in reverse and operated.
The other work steps are the same as those in (1) to (6) above.

Further, the target conduit 1 may be any type of concealed pipe or even an exposed pipe other than a buried gas pipe.

Furthermore, in the above embodiment, the flexible tube 7 is held by fitting onto the spiral wire 4, but it may also be held by fitting inside the spiral wire rod 4. In that case, as shown in FIG. The tip 7b of the flexible tube 7 is positioned to extend into the connection fitting 10, and the tip 7b of the flexible tube 7 is
It is also possible to use a wiring fitting 6 in which a nozzle 10a for injecting the glycol liquid is formed in the connecting fitting 10 by connecting to the connecting fitting 10.

FIG. 4 shows another embodiment of the wire passing tool 6, in which two spiral wire rods are attached to the connecting fitting 10 with an intersection angle (θ) that allows them to pass through the branch pipe 2. 5, 5 are used to connect and support the plumb-shaped guide members 3, 3, and such a double-headed wire guide member 6 is particularly suitable for connecting the branch pipe 2 like a mechanical joint part.
When there is a large step on the inner surface, when one guide member 3 gets caught, the rotation of the other guide member 3 and the accompanying reaction and vibration release the catch, allowing smooth entry into the pipe. is obtained and is even more effective.

[Brief explanation of the drawing]

Fig. 1 is a schematic vertical sectional view of the entire structure showing the glycol liquid injection state, Fig. 2 is an enlarged vertical sectional view of the main part of the wire threading tool, and Figs. 3 and 4 are respectively different examples of the wire threading tool. FIG. 1... Conduit, 2... Branch pipe, 3... Guidance member,
4, 5...Spiral wire rod, 6...Wire passing tool, 7...Flexible tube, 8...Blocker, 7a, 10a...Nozzle part.

Claims (1)

[Claims] 1. Exposed open end 2 of branch pipe 2 connected to conduit 1
A method of injecting liquid into the conduit 1 through a flexible tube 7 inserted into the branch pipe 2 from A, or discharging the liquid in the conduit 1, and moving the liquid inside the branch pipe 2. Cone-shaped guide member 3 with possible roundness
For a wire threading tool 6, which is connected to and supported at the tip of a spiral wire rod 4 having relatively strong elasticity via a spiral wire rod 5 which is weaker in elasticity and shorter than the wire rod 4,
The flexible tube 7 is fitted and held in the wire rod 4, and nozzle parts 7a and 10 are provided on the tip side of the flexible tube 7.
a, and an elastic blocking device 8 capable of blocking the branch pipe 2 is fitted around the nozzle portions 7a, 10a of the flexible tube 7, and the wire passing device 6
is inserted into the branch pipe 2 from the guiding member 3 side through the exposed open end 2A, and in this inserted state, rotation and vibration are applied to the entire wire threading tool 6 via the spiral wire 4 while its passage is By pushing the wire 6 into the branch pipe 2, the flexible pipe 7 is inserted into the nozzle part 7.
a, 10a are inserted into the branch pipe 2 so as to reach the inside of the conduit 1, and the blocking device 8 is inserted into the branch pipe 2.
It is confirmed that the fluid has entered the conduit 1 from the conduit 1 by detecting the flow of fluid from the conduit 1 into the branch pipe 2, and after that confirmation, the flexible tube 7
A method for injecting liquid into a conduit or discharging a liquid through the conduit. 2. The method for injecting or discharging a liquid into a conduit according to claim 1, wherein the liquid to be injected into the conduit 1 is a glycol liquid.