JP4372831B1 - Pipe line insertion device and line insertion method using the same - Google Patents

Abstract

An object of the present invention is to easily insert a lead-in wire for laying a cable into a pipe line with less power.
As a conduit insertion device provided at the tip of a lead-in wire 6, a sealed long bag 62 made of a resin film in which a small amount of air is enclosed is used. The sealed long bag 62 is free to be deformed, has little friction and catching, and pulls the lead-in wire 6 satisfactorily.
[Selection] Figure 1

Description

  The present invention relates to a pipe line insertion device that is preferably used for cable insertion into a pipe line and a line insertion method using the pipe line insertion device.

  When laying a cable in an empty or already-installed conduit, the cable is inserted into the conduit by fixing the tip of the cable to the tip of the lead-in previously inserted in the conduit and pulling back the lead-in. It is common to line.

  In this lead-in insertion operation, an air flow is formed in the pipeline, and the propelling member is fixed to the tip of the lead-in line, or a fluid resistance force (drag force) applied to the propelling member by the air flow or static before and after the propelling member A lead-in wire insertion technique for urging the propelling member in the lead-in wire insertion direction by a pressure difference is known. In addition, a push-in type lead-in insertion technique for pushing a pipe line insertion device in a pipe line with compressed air instead of sucking air is also known.

For example, the following patent document 1 owned by the present applicant proposes to provide a number of tape-shaped pipe line insertion devices that generate a large fluid resistance force (drag force) at the leading end of the lead-in wire. Yes. Each tape can move forward while avoiding it by flexibly deforming even if there is an obstacle such as an existing cable or a corner of a pipeline. In addition, when the tape is bent due to these obstacles, there is an advantage that the drag force, that is, the tape propulsion thrust is further increased. In addition, a parachute type pipe line insertion device that generates a thrust by a differential pressure between the front and rear is also known. That is, as a conventional insertion method, a fluid resistance utilization promotion method and a differential pressure utilization promotion method are known.
In the suction-type lead-in insertion technology, air that sucks air in the pipe from the outlet side of the pipe to form an air flow in the pipe or to create a differential pressure before and after the pipe insertion device A suction device is used.

  Patent Document 1 employs a tape-shaped pipe line insertion device. This tape-shaped pipe line insertion device generates a fluid resistance force by flapping like a flag in the airflow, and avoids obstacles in the pipeline by riding on the airflow. Since there is an air flow between the cable and the existing cable, the contact friction resistance is also reduced. However, since the tape absorbs only a part of the kinetic energy of the airflow formed in the pipe, that is, the dynamic pressure, there is a problem that the thrust of the tape-like pipe insertion device is relatively small.

  A known parachute type insertion technique employs, for example, a soft parachute-shaped pipe insertion apparatus formed of a resin film or the like. Since the rear end opening of the parachute-shaped pipe insertion device opens almost to the full opening of the pipe, a large thrust is generated due to the differential pressure (static pressure difference) before and after the parachute-type pipe insertion device. However, this parachute-shaped pipe insertion device has a parachute-shaped pipe insertion device when the air flow direction changes suddenly at the bent part of the pipe and the rear end opening of the parachute-type pipe insertion device is deflated. It flows around the periphery of the road insertion device.

  As a result, the parachute-shaped pipe insertion device is difficult to open again, and the parachute-shaped pipe insertion device is pressed against a partial region of the inner surface of the pipe, and the thrust may disappear. Furthermore, the rear end of the parachute-shaped pipe line insertion device is connected to the tip of the auxiliary line for insertion by a number of parachute strings, but the parachute string is generated at the bent portion or the inner surface of the inner surface of the pipe line. There was a possibility that it would be caught on a protrusion such as rust or an existing cable, cut off, twisted by rotation to narrow the rear end opening of the parachute, or the propulsion of the pipe insertion device stopped.

Japanese Patent No. 4117861

(Task)
There are various obstacles such as rust, water, and existing cables in the pipeline. The propulsion member needs to generate a large thrust in order to drag the lead-in line through a long pipeline reaching several hundred meters. In order to withstand this large thrust, the propulsion member needs to have a tensile strength to withstand this large thrust. The propelling member needs to have a scratching strength that does not break due to friction with the obstacle and a smooth surface that does not catch on these obstacles. In order to generate a large differential pressure and fluid resistance in spite of the change in the cross-sectional shape of the pipe line due to the obstacle and the bending or branching of the pipe line, the propelling member is flexibly deformed according to the change in the pipe cross-section It is necessary to reduce air leakage as much as possible.

  However, the above-described various lead-in traction systems proposed in the past do not solve all of these problems. For this reason, in the current market, wire insertion work that requires a very large labor burden due to the pushing of the wire by human power is still employed.

(the purpose)
The present invention has been made in view of the above-mentioned problems, and can generate a large thrust while reducing the flight disturbance force such as frictional resistance and catching between the pipe insertion device and the pipe inner surface and existing cables. An object of the present invention is to provide a simple line insertion device.
(Solution)

A pipe line insertion device of the present invention that solves the above problems is a lead-in line for laying a cable in the pipe line, and is fixed to the tip of the lead-in line and is energized by the air in the pipe line. And a differential pressure propulsion member that pulls the lead-in line, wherein the differential pressure propulsion member includes an outer diameter that can be in close contact with the inner surface of the pipe, and a pipe direction that is longer than the outer diameter. A sealed thin bag made of a soft thin layer material that is formed in a substantially torpedo shape and has air partially enclosed therein, and the sealed long bag is the maximum at atmospheric pressure. An amount of air or gas that gives the sealed elongated bag a volume of 5 to 70% of the volume is accommodated, and the sealed elongated bag is sucked from the front in the pipe line, thereby the central portion of the sealed elongated bag. And the head of the sealed bag as a result of the forward movement of the air or gas in the tail Bulges, and is characterized by providing a thrust to the drop line in a substantially tadpole shape defined as the shape of the central portion and the tail portion of the closed length bag dwindle.

A sealed bag filled with air (or gas) is excellent in deformability, so even if various obstacles are present in the pipeline, it can be deformed accordingly. Since it has an occlusive property and a small frictional resistance, air leakage between the sealed long bag and the inner surface of the pipe line is well prevented. For this reason, even if various obstacles exist in the pipe line, they can be deformed accordingly to block the air leakage passage, and a large driving force can be given to the lead-in line.
That is, normally, a gas composed of air is only partially injected into the sealed long bag in a sealed state. The amount of gas (preferably air) enclosed in the sealed bag is important. If the amount of air is too large, the sealed long bag cannot pass through a narrow portion in the pipe, and the head of the sealed long bag is in close contact with the inner surface of the pipe to increase the frictional resistance. If the amount of air is too small, the head of the sealed elongate bag cannot satisfactorily adhere to the inner surface of the pipe line over its entire circumference, so the ability to pull the lead-in line decreases due to increased air leakage.
An important feature of the present invention is that the maximum volume of the sealed sealed bag is considerably larger than the amount of air in the sealed bag (volume under atmospheric pressure). As a result, it is possible to give the closed long bag traveling in the pipe line with good pipe blockage, good deformability, and relatively small frictional resistance.
This point will be described in more detail below.
When the air is sucked from the front in the straight pipe line, the sealed air in the sealed long bag gathers at the head of the sealed long bag due to the airflow and atmospheric pressure around the sealed long bag. This is because the air pressure in the duct part adjacent to the front of the head of the sealed bag is reduced by the above suction, but the air pressure in the duct part adjacent to the center part and the tail part of the sealed bag is maintained at substantially atmospheric pressure. Because. For this reason, the sealed air in the central part and tail part of the sealed long bag moves forward, and as a result, the central part and tail part of the sealed long bag are deflated to form a string, and the head of the sealed long bag swells. Eventually, the sealed long bag has a substantially tadpole shape in which the string-like portion extends from the large head to the rear. The head of the inflated sealed bag is in close contact with the inner surface of the conduit and closes the conduit, and the suction pressure works well on the head of the sealed bag, and this sealed bag has a large thrust on the lead-in line. give.
Next, this line insertion device made up of a substantially tadpole-like sealed long bag, although it is long as a whole, only the head swells when drawing the lead-in line, so that the total contact with the pipe inner surface The area is relatively small, and an increase in frictional resistance can be suppressed.
Further, the sealed long bag can be flexibly deformed following the bending of the pipe line and the change in the diameter. In other words, when the head volume of the sealed long bag is reduced as a result of a decrease in the cross-sectional area of the head viewed from the front due to bending of the pipe line or a change in the diameter (speaking in short), The enclosed air moves to the center and tail of the sealed long bag behind it, and as a result, there is no problem even if the pipe line suddenly bends or narrows, and the head shape changes to the shape accordingly can do. Thereafter, when the duct returns to the original shape, the air at the center or tail of the head moves to the head again, and the head shape is restored to the original large shape. Even when an existing cable is present in the pipeline, the head shape can be similarly deformed accordingly. Furthermore, the sealed long bag is very lightweight, can be manufactured at low cost, and has an effect that it can be easily connected to or replaced with the lead-in wire.
Furthermore, the sealed long bag of the present invention can pass through a passage narrowed by an existing cable or the like, for example, at a predetermined portion of a pipeline. In other words, when the head of the sealed long bag reaches the narrowed portion, the air inside moves toward the rear, so that it narrows in accordance with the shape of the narrowed portion and passes through the narrowed portion. Thereafter, the internal air moves to the head of the sealed long bag that has passed through the narrow portion, and the head swells again. Thereafter, the narrowed central portion and tail portion of the sealed long bag sequentially pass through the narrow portion. The deformation operation of the sealed long bag for passing through the narrow part of the pipeline is overwhelming compared to that of the conventional elastic ball type differential pressure propelling member, parachute type differential pressure propelling member and tape-like differential pressure propelling member. Excellent.

In a preferred aspect, a leading end portion of the lead-in line is connected to a rear end portion of the sealed long bag. Thereby, the differential pressure applied to each part of the sealed long bag can be satisfactorily changed to the drawing line pulling thrust. In addition, the sealed long bag and the lead-in wire can be easily connected.
In a preferred embodiment, the sealed long bag is made of a soft thin layer material made of resin and has a predetermined maximum volume .
In a preferred aspect, the sealed long bag contains air or gas in an amount that provides the sealed long bag with a volume of 10 to 60% of the maximum volume at atmospheric pressure.

In a preferred embodiment, the sealed long bag is formed of a resin film. For example, the sealed long bag is formed of a resin film having a thickness of 1 to 100 μm, but the thickness can be changed if the flexibility can be secured. Preferably, a resin material excellent in wear resistance and tensile strength, for example, a thermoplastic resin film is preferably used. Economically, a resin film material similar to a disposable shopping bag or a disposable umbrella bag can be used as the sealed long bag.
The sealed long bag can be manufactured by folding a single resin film cut into a desired developed shape and heat-welding the end portion except for one end portion in the longitudinal direction. In addition, the sealed long bag can be manufactured by heat welding, except for one end in the longitudinal direction, of the ends of the two resin films cut into a necessary developed shape. The sealed long bag can have the same shape as, for example, a bag that wraps French bread.

In a preferred embodiment, the sealed long bag comprises a resin bag portion made of a resin film capable of enclosing air therein, and a reinforcing portion having flexibility and at least a longitudinal tensile strength superior to the resin bag portion. The reinforcing part is made of a resin member that is thicker than the resin film of the resin bag part and has a large gap, and is in close contact with the entire outer surface or inner surface of the resin bag part.
For example, a resin film in which a fiber layer is bonded or integrated can be employed as a material for the sealed long bag. As this fiber layer, a thin cloth or net can be considered. As the cloth, a woven cloth or a non-woven cloth can be adopted. In this way, the tensile strength of the sealed long bag can be increased. In addition, a reinforcement part and a sealing long bag may be made into a separate structure, and you may use it piled up double.

In a preferred aspect, the reinforcing portion is in close contact with the entire circumference of the outer surface of the resin bag portion. In this way, the reinforcing portion can satisfactorily prevent the sealed long bag from being rubbed and damaged by the inner surface of the pipe line and the obstacle in the pipe line.
In a preferred embodiment, the sealed long bag comprises a resin bag portion made of a resin film capable of enclosing air therein, and a reinforcing portion having flexibility and at least a longitudinal tensile strength superior to the resin bag portion. And the reinforcing portion extends from the front end portion of the resin bag portion along the outer surface of the resin bag portion and reaches the connecting portion between the lead-in line and the sealed long bag, and the reinforcing portion The rear end portion is connected to the leading end portion of the lead-in line so as to transmit a force. Thereby, since the pulling-line pulling thrust applied to the sealed long bag can be reduced, it is possible to prevent the resin film constituting the resin bag portion from being fatigued and damaged.

  In a preferred aspect, the reinforcing portion is formed in a net shape or a bowl shape and covers the resin bag portion. For example, the reinforcing part can be formed of a fruit storage net or the like. Thereby, the reinforcement part can prevent well that the resin film which comprises a sealed elongate bag is rubbed with the inner surface of a pipe line, and the obstruction in a pipe line, and is damaged. In addition, the mesh-like or saddle-shaped reinforcing part reduces the frictional resistance of the propulsion member because the area of contact with the inner surface of the pipe line is small while preventing air leakage passing through between the pipe inner face and the reinforcing part. can do.

  In a preferred aspect, the reinforcing portion is composed of a plurality of thread-like or tape-like resin members joined to the outer surface of the resin bag portion at a predetermined pitch in the circumferential direction. In this way, the deformability in the longitudinal direction of the resin bag portion is suppressed, and the deformability in the direction perpendicular to the longitudinal direction (that is, the circumferential direction) is ensured. For example, the pipeline is a spiral tube or corrugated (wave) Even if it is a pipe | tube, it can prevent favorably that generation | occurrence | production of a big resistance with respect to a propulsion | protrusion is carried out because a sealed long bag swells to the large diameter part of these pipe inner surfaces.

In a preferred aspect, the sealed long bag has a substantially rectangular shape in a flat state in which the air or gas is not sealed. Thereby, a sealed long bag can be manufactured easily.
In a preferred embodiment, the sealed long bag has a length of 2 to 20 times, more preferably 4 to 10 times the width of the sealed long bag in a flat state. Thereby, the air resistance of the clearance gap between a sealing long bag and a pipe line inner surface can be increased, and an air leak can be reduced.

In a preferred aspect, the sealed long bag has a hemispherical tip. Thereby, a movement of a pipe line insertion apparatus can be made easy, and frictional resistance can also be reduced.
In a preferred aspect, the sealed long bag is formed by turning the resin bag upside down after being tied or thermally bonded in a flat state with the front end portion of the rectangular resin bag facing the center in the width direction. Thereby, the front end part of a sealed long bag can be formed in a substantially hemispherical shape, reducing the manufacturing cost of a sealed long bag.

  In a preferred aspect, the sealed long bag has an opening for injecting the air or gas at a rear end. Thus, after a proper amount of air is injected into the long bag from the opening, the long bag can be sealed or tied. According to this aspect, the sealed long bag can be manufactured at low cost, and the amount of air enclosed in the sealed long bag can be easily adjusted according to the pipe diameter.

In a preferred embodiment, the sealed long bag consists of a bag made of a resin film that is open at only one end in the longitudinal direction. Thereby, a sealed long bag can be manufactured cheaply and easily.
In a preferred embodiment, the sealed elongate bag includes a screwed cap that detachably closes the opening. Thereby, adjustment of the amount of enclosed air becomes easy.

In a preferred aspect, the sealed elongate bag is connected to the lead-in line further rearward than a portion where the opening is closed. Furthermore, since the portion of the long bag on the downstream side of the closing portion has a string shape, it can be easily and suitably connected to the front end portion of the lead-in line.
In a preferred embodiment, the sealed elongate bag is sealed after injecting air or gas into the sealed elongate bag in an amount that gives the sealed elongate bag a predetermined ratio of the maximum volume of the sealed elongate bag at atmospheric pressure. Thereafter, the sealed long bag connected to the lead-in wire is inserted from one end of the conduit and the air in the conduit is sucked from the other end of the conduit, and the predetermined ratio is 5 to 70%, Preferably, it is 10 to 60%, and the pipe has an inner diameter with which the outer peripheral surface of the sealed long bag after the air or gas is poured can be in close contact.
If it does in this way, for the reason mentioned above, the draw-in line pulling effect excellent in comparison with the conventionally well-known pipe line insertion device can be produced with the suction device of comparatively small power.

  In a preferred aspect, the sealed long bag is filled with air or gas in an amount that allows at least the outer peripheral surface of the sealed long bag to be in close contact with the entire inner peripheral surface of the pipe in accordance with the inner diameter of the pipeline to be inserted. Inject. Thereby, an excellent thrust can be obtained.

It is a principal part expanded sectional view of the wire insertion apparatus of Embodiment 1. FIG. It is an enlarged side view of the airtight long bag of FIG. It is a top view which shows the state which flattened the airtight long bag of FIG. It is a side view which shows the deformation | transformation state of the airtight long bag in the case of passing an obstruction. It is a schematic side view which shows the deformation | transformation aspect of the airtight long bag of Embodiment 1. It is a model side view of the airtight long bag of Example 2. FIG. It is a partially expanded side view of the sealed long bag of FIG. 6 is a schematic side view of a sealed long bag 62 of Example 3. FIG. It is a partially expanded side view which shows the deformation | transformation aspect of the airtight long bag of Example 3. FIG.

(Embodiment 1)
A preferred embodiment of the wire insertion device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of the insertion device of this embodiment.
Reference numeral 1 denotes a vacuum suction device, which is composed of an air suction device driven by a motor. 2 is an air hose made of a rubber cylinder or a resin cylinder. As the vacuum suction device 1, for example, a vacuum cleaner or a blower can be employed. Since this type of vacuum suction device 1 is well known, further description is omitted. The air hose 2 is fixed so as to cover the opening on the suction side of the vacuum suction device 1. Thereby, the vacuum suction device 1 sucks air through the air hose 2.

  Reference numeral 3 denotes a conduit that forms a cable laying pipe buried under the road, and reference numeral 6 denotes a lead-in wire made of a steel stranded wire. 7 and 8 are manholes, and 9 is a road pavement. The manholes 7 and 8 are separated by a predetermined distance, for example, about 200 meters along the road. The insertion port of the pipe line 3 buried in the ground opens to the wall surface of the manhole 8, and the outlet 31 of the pipe line 3 opens to the wall surface of the manhole 7. A tail portion of a sealed long bag 62 serving as a differential pressure propelling member is fixed to the leading end of the lead-in wire 6.

  An inlet side cylindrical member 22, which is a bowl-shaped air suction end, is fixed to the tip of the air hose 2, that is, the opening on the suction side. The inlet side cylindrical member 22 forms part of the air hose 2. The rubber inlet side cylindrical member 22 is formed in a bowl shape and is in close contact with the wall surface by the negative pressure inside. That is, when the peripheral edge portion of the inlet side cylindrical member 22 is brought into close contact with the wall surface or the like on which the pipe line 3 is opened, the peripheral edge portion of the inlet side cylindrical member 22 is adsorbed on the wall surface around the pipe line by suction of the vacuum suction device 1. The inlet side cylindrical member 22 is easily held on the wall surface. Furthermore, since the front-end | tip peripheral part of the inlet side cylindrical member 22 is elastically deformed along the unevenness | corrugation of a wall surface, an air leak is prevented favorably.

  The inlet-side cylindrical member 22, which is the tip of the air hose 2, covers the outlet 31 of the conduit 3, and the tip peripheral edge of the inlet-side cylindrical member 22 is in close contact with the side wall surface of the manhole 8. When the air in the pipe line 3 is sucked through the air hose 2 by driving the vacuum suction device 1, the lead-in line 6 moves in the pipe line 3 toward the outlet 31 side due to the pressure difference acting on the sealed long bag 62.

The sealed long bag 62 that characterizes this embodiment will be described in detail with reference to FIG.
The sealed long bag 62 is formed of a sealed long bag. The tail portion 64 of the sealed long bag 62 is coupled to the distal end portion of the lead-in wire 6 for laying the cable in the conduit 3, and is pulled by the air in the conduit 3 to pull the lead-in wire 6. . The sealed long bag, that is, the sealed long bag 62 is formed in a long cylindrical shape from a polyethylene film having a thickness of several to several tens of μm, for example. The sealed long bag 62 is hermetically sealed with a small amount of air, and the air injection opening provided in the tail 64 of the sealed long bag 62 is closed by a method such as tightly wrapping an adhesive tape 63. At the same time, it is fixed to the tip of the lead-in wire 6.

A manufacturing example of the sealed long bag 62 will be described with reference to FIG. Two polyethylene films cut in advance in the shape of a match rod shown in FIG. 3 are prepared. Next, of the peripheral portions of the two polyethylene films, the peripheral portion excluding the tail portion 64 (the broken line portion shown in FIG. 3) is thermally welded to produce the sealed long bag 62 having the tail portion 64 opened. When the air is injected, the sealed long bag 62 can have a torpedo shape having a slightly inflated head 65.
In addition, the torpedo-like sealed long bag 62 in which the head 65 is expanded may be manufactured by heat-welding the peripheral portion of one bent resin film except the opening of the tail portion 64.

  Furthermore, in this embodiment, in order to improve durability, a net-like resin net 66 is bonded in advance to a portion that becomes the head 65 in the polyethylene film for forming the sealed long bag 62. Of course, this resin net 66 may be bonded in advance to the entire surface of the polyethylene film, or a multilayer netted resin film incorporating the resin net 66 may be employed. For example, the resin net may be similar to a resin net containing mandarin oranges. Of course, the use of this resin net can be omitted.

  If it does in this way, the tear of the part of the head 65 of the airtight long bag 62 with the largest friction with the inner surface of the pipe line 3 etc. among the airtight long bags 62 can be prevented favorably. In addition, by providing the resin net 66 on the outside of the polyethylene film, the frictional resistance between the inner surface of the pipe line 3 and the sealed long bag 62 can be greatly reduced while preventing air leakage. The performance can be further improved. In addition, the sealed long bag 62 may be a simple long rectangular bag in which, for example, French bread is put.

  The tail part 64 of the sealed long bag 62 is sealed by a method such as fastening, and air is sealed inside. The amount of air enclosed in the sealed long bag 62 is set to an amount that gives the sealed long bag a volume of 5 to 70%, more preferably 10 to 60% of its maximum volume at atmospheric pressure. Thereby, it is possible to satisfactorily achieve both the pipeline blocking function and the shape deformation function. In other words, the gas composed of air is usually injected only partially into the sealed long bag 62 in a sealed state. If the amount of enclosed air is too large, the sealed long bag 62 cannot pass through the narrow portion in the pipe 3, and the head of the sealed long bag 62 is in close contact with the inner surface of the pipe 3 to increase the frictional resistance. To do. If the amount of enclosed air is too small, the head of the sealed long bag 62 cannot be brought into close contact with the inner surface of the pipe line 3 over its entire circumference, so that air leakage increases and the pulling ability of the lead-in wire 6 decreases. .

The length of the sealed long bag 62 in the flat state is 2 to 20 times, more preferably 4 to 10 times the width. Thereby, the air resistance of the clearance gap between a sealing long bag and a pipe line inner surface can be increased, and an air leak can be reduced.
As the resin film constituting the sealed long bag 62, a polypropylene resin film having excellent tensile strength is suitable. The thickness of the resin film is set to 1 to 100 μm, for example, 50 μm, but the thickness can be changed as long as flexibility can be secured. The sealed long bag 62 preferably has a length of 2 to 20 times, more preferably 4 to 10 times the width of the sealed long bag in the flat state. Thereby, air leakage can be reduced.

  An insertion process using the sealed long bag 62 made of the sealed long bag 62 will be described below. Sealed long bags 62 of various sizes opened at only one end in the longitudinal direction are carried along with the lead-in wire 6, the vacuum suction device 1 and the air hose 2 to the construction site. The lead-in wire 6 is preferably wound around a reel (drum). At the construction site, an appropriate amount of air is blown into the sealed long bag 62 of an optimal size selected in accordance with the diameter of the pipe line 3, and the opening is closed to form a sealed bag.

  Next, this sealed long bag 62 is fixed to the leading end portion of the lead-in line and disposed on one end side of the conduit 3. Next, the air hose 2 extending from the vacuum suction device 1 is attached to the other end side of the pipe line 3, and the vacuum suction device 1 is started. Thereafter, the head of the sealed long bag 62 that forms the sealed long bag 62 is inserted into one end of the conduit 3. The sealed long bag 62 is sucked into the duct 3 by the air flow in the air duct 3 formed by the vacuum suction device 1. The head of the sealed long bag 62 is selectively inflated in the pipe 3.

  As a result, most of the differential pressure formed by the vacuum suction device 1 acts before and after the head of the sealed long bag 62. Thereby, the sealed long bag 62 pulls the lead-in wire 6 strongly. When the lead-in line 6 penetrates the pipe line 3, the sealed long bag 62 is removed from the lead-in line 6, and a cable is attached to the tip of the lead-in line 6 instead, and the lead-in line 6 is pulled in the reverse direction to connect the cable to the pipe line. Complete the insertion.

(effect)
According to this insertion method, the pulling-line traction effect that is remarkably superior to various conventionally known pipe insertion devices can be obtained by the suction device with relatively small power for the reasons already described.
The amount of sealed air in the sealed long bag 62 is reduced with respect to the maximum volume of the sealed long bag 62. For this reason, when the sealed long bag 62 is put into the conduit 3 and sucked, the sealed air in the sealed long bag 62 is pushed into the head of the sealed long bag 62 due to the pressure difference between the front and back of the sealed long bag 62. As a result, the head of the sealed long bag 62 swells, and the central portion and tail of the sealed long bag 62 are deflated. For this reason, the sealed long bag 62 moves favorably by pulling the lead-in wire 6 due to this pressure difference.

  The sealed long bag 62 can be flexibly deformed following the bending of the pipeline and the change in the diameter. For example, the case where the pipe line 3 is squeezed at a predetermined position by existing cables, rust, or foreign matter will be described with reference to FIG. The hatched part is a foreign object. When passing through the portion of the narrowed conduit 3, the air in the head of the sealed elongate bag 62 moves backward, so that the head of the sealed elongate bag 62 passes through this squeezed portion well. After passing, the head of the sealed elongate bag 62 can swell again to its original shape. The above-described deformation operation of the sealed long bag for passing through the narrow portion of the pipe line is overwhelmingly superior to that of the conventional parachute type pipe line insertion device and tape-type pipe line insertion device.

(Other aspects)
The amount of air sealed in the sealed long bag 62 can be adjusted in accordance with the diameter of the conduit 3 and the number of existing cables in the conduit 3. Thereby, one type of sealed long bag 62 can be used as a propulsion member for a plurality of types having different calibers. However, the maximum diameter of the sealed long bag 62 needs to be larger than the inner diameters of the various pipelines 3 into which the lead-in wire 6 is inserted.

In addition, instead of enclosing air in the sealed elongate bag 62 at the construction site and closing the opening of the tail 621 of the enclosed elongate bag 62, the sealed elongate bag 62 in which air adjusted to the optimum amount for each pipe diameter is enclosed in advance. May be used.
Further, it is preferable that the head of the sealed long bag 62 is formed in a substantially hemispherical shape in an inflated state from the viewpoint of reducing the contact area with the inner surface of the conduit 3, but instead, the frictional resistance is reduced. can do.

The sealed long bag 62 can be manufactured by folding a single resin film cut into a desired developed shape and heat-welding it except for one end in the longitudinal direction. In addition, the sealed long bag 62 can be manufactured by heat-sealing except for one end in the longitudinal direction of the ends of the two resin films cut into the necessary developed shape.
A modification of the shape of the sealed long bag 62 will be described with reference to FIG.
FIG. 5A shows a long-envelope-shaped resin bag 620 having one end opened for the sealed long bag 62. In the flat state, it is formed in a rectangular shape. Only the rear end (right end in the figure) of the resin bag 620 is opened. By injecting appropriate air into the resin bag 620, the opening is tied with a string, or the aluminum ring 621 is fitted and caulked to complete the sealed long bag 62 (FIG. 5B).
However, FIG. 5B shows a state in which the internal air has moved forward. At the same time, the leading end of the lead-in wire 6 may be coupled to the rear end of the sealed long bag 62 by this opening closing operation.

Another example of the sealed long bag 62 will be described with reference to FIG. In FIG. 5C, a rectangular long bag having both ends opened is prepared, and the front end of the long bag is sealed by a method such as binding. Next, the long bag is turned over so that the tied portion enters the sealed long bag 62. If it does in this way, the front-end | tip part of the airtight long bag 62 can be formed in a substantially hemispherical shape.
Another example of the sealed long bag 62 will be described with reference to FIG. In FIG. 5 (D), a small tube portion 623 for blowing air is provided at the rear end portion of the sealed long bag 62, and a cap 624 is screwed onto the small tube portion 623, so that the air in the sealed long bag 62 is Leakage is prevented. Thereby, adjustment of the amount of enclosed air can be easily performed even if it is difficult to understand.

(Embodiment 2)
Another embodiment of the wire insertion device of the present invention will be described with reference to FIG. FIG. 6 is a schematic side view of the sealed long bag 62 that constitutes the propulsion member of this embodiment. However, the sealed long bag 62 is assumed to have received a differential pressure in the pipe line 3 shown in cross section.

  The sealed long bag 62 includes a resin bag portion 625 made of a resin film that can enclose air therein, and a reinforcing portion 626 that has flexibility and has a longitudinal tensile strength superior to that of the resin bag portion 625. The reinforcing portion 626 is formed of a resin net that is thicker than the resin film that forms the resin bag portion 625, and covers the resin bag portion 625. In FIG. 6, for easy understanding, a gap is provided between the outer reinforcing portion 626 and the inner resin bag portion 625, but both are actually in close contact with each other.

  The reinforcement part 626 which is a resin net is easily imaged by a mandarin orange bag etc., for example. FIG. 7 is a schematic partial enlarged side view in which a part of the reinforcing portion 626 is enlarged, and each thread 6260 constituting the net is skewed. Of course, a lattice-shaped net or a net knitted in a hook shape may be used.

  An unillustrated rear end portion of the reinforcing portion 626 is coupled to an unillustrated leading end of the lead-in line 6 together with a rear end portion (not shown) of the resin bag portion 625. It is also possible to connect only the reinforcing part 626 to the leading end of the lead-in line 6 and not connect the resin bag part 625 to the lead-in line 6. In addition, a resin net forming the reinforcing portion 626 may be bonded to the surface of the resin bag portion 625 by heating or the like.

In this way, the following effects can be achieved.
First, even if a predetermined portion of the resin bag portion 625 comes into contact with an obstacle or the like in the reinforcing portion 626, the reinforcing portion 626 disperses the stress, so that a large stress does not concentrate on the predetermined portion. Further, since the reinforcing portion 626 can bear a part or all of the thrust applied to the sealed long bag 62, the sealed long bag 62 is not fatigued or torn. Furthermore, the net-like or ridge-like reinforcing portion 626 that encloses the sealed long bag 62 has many gaps, so that the frictional resistance with the inner surface of the pipeline 3 is relatively small, but the Since the gap between the inner surface of the pipe line 3 and the outer peripheral surface of the resin bag portion 625 in the longitudinal direction is blocked many times by the net thread constituting the reinforcing portion 626, air leakage can be reduced.

(Embodiment 3)
Another embodiment of the insertion device of the present invention will be described with reference to FIG. FIG. 8 is a schematic radial cross-sectional view of the sealed long bag 62 serving as a propelling member. However, the sealed long bag 62 is assumed to have received a differential pressure in the pipe line 3 shown in cross section.

  This sealed long bag 62 includes a resin bag portion 625 made of a resin film that can enclose air therein, and a reinforcing portion 626 that has flexibility and a tensile strength in the length direction superior to that of the resin bag portion 625. . The reinforcing portion 626 is formed of a resin net that is thicker than the resin film that forms the resin bag portion 625, and is joined to the outer surface of the resin bag portion 625 by heat or an adhesive.

  The reinforcing portions 626 radially extend from the center of the front end portion (head) of the resin bag portion 625 radially on the hemispherical head, and then extend rearwardly on the outer peripheral surface of the resin bag portion 625 in parallel to each other. Resin tape 6261. By receiving the differential pressure in the pipe 3, the air in the resin bag portion 625 is unevenly distributed in front of the resin bag portion 625, so that the rear end portion of the resin bag portion 625 is narrowed. Therefore, the interval (circumferential direction) between the resin tapes 6261 on the rear side is gradually reduced. The exposed resin bag portion 625 located between the resin tapes 6261 is thin and flexible, so that it closely adheres to the inner diameter of the conduit 3, but the remainder is bent and accommodated radially inward of the conduit 3. ing.

  The width, length, and arrangement pattern of the resin tape 6261 can be selected as appropriate. For example, as shown in FIG. 9, a large number of resin tapes 6261 having a short length may be distributed in a zigzag pattern. In addition, the resin tape 6261 may be a resin tube having a small diameter such as a straw. The resin tape 6261 may be bonded to the inner surface of the resin bag portion 625. The resin tape 6261 may not be provided at the front end (head) of the sealed long bag 62. The resin tape 6261 may not be provided at the rear end (tail) of the sealed long bag 62. If the resin tape 6261 is relatively harder than the resin bag portion 625, the thickness of the resin tape 6261 is arbitrary, and may be, for example, about the same as the resin bag portion 625. The resin tape 6261 may be made of a material other than resin such as metal foil. The resin tape 6261 and the resin bag portion 625 may be integrally formed.

  The sealed long bag 62 of this embodiment has a large number of resin tapes 6261 bonded to the outer surface of a thin resin tape 6261, and each resin tape 6261 has a longitudinal direction of the sealed long bag 62 over the entire circumference of the sealed long bag 62. Since the pipes 3 are formed of corrugated pipes or spiral pipes having a corrugated cross section, the flexible resin bag portion 625 is in close contact with the corrugated recesses of the pipe 3 and has a large resistance. No power is generated. That is, the resin tape 6261 prevents such deformation of the sealed long bag 62.

  The resin tape 6261 prevents the thin resin bag portion 625 from being worn. The rear end portion of the resin tape 6261 reaches the lead-in wire 6, and most of the propulsive force (thrust) applied to the sealed long bag 62 is transmitted to the lead-in wire 6 through the resin tape 6261. For this reason, fatigue of the thin resin bag part 625 can be prevented.

(Modification)
In order to facilitate the recognition of the sealed long bag 62 that has reached the air hose 2 side from the pipeline 3, it is preferable to make the air hose 2 light transmissive and to color the sealed long bag 62. In addition, it is preferable to provide a stopper net for restricting further advancement of the sealed long bag 62 at a predetermined portion of the air hose or at the outlet of the conduit 3. Alternatively, the sealed long bag 62 and the lead-in wire 6 may be connected via a universal joint that is relatively rotatable.
In addition, a plurality of tape-like connecting tape portions may be extended backward from the rear end portion of the sealed long bag 62 and / or the resin net 66. It is preferable that both ends of each connection tape part are connected to the main body part of the sealed long bag 62 and / or the resin net 66 like a handbag, for example. If it does in this way, it will become easy to fasten the tip of lead-out line 6 to airtight long bag 62 or resin net 66.

1 Vacuum suction device 2 Air hose 3 Pipe line (cable laying pipe)
6 Lead-in wire 7 Manhole 8 Manhole 62 Sealed long bag 63 Tape for binding the opening of the sealed long bag 64 Tail of the sealed long bag 65 Head of the sealed long bag 66 Resin net (reinforcement part)
623 Small cylinder part for blowing air 624 Cap 625 Resin bag part as part of sealed long bag 626 Reinforcement part as other part of sealed long bag 6261 Resin tape as reinforcement part

Claims (22)

A pipe having a lead-in line for laying the cable in the pipe, and a differential pressure propelling member fixed to the tip of the lead-in line and energized by the air in the pipe to pull the lead-in line In the road insertion device,
The differential pressure propulsion member has an outer diameter which can be brought into close contact with the inner surface of the conduit, the air or gas is partially enclosed in an inner portion and an axial length of a long conduit direction than the outer diameter Has a sealed long bag made of soft thin layer material,
The sealed long bag contains air or gas in an amount that gives the sealed long bag a volume of 5 to 70% of the maximum volume at atmospheric pressure ,
As a result of the air or gas in the central part and tail part of the sealed long bag moving forward by being sucked from the front in the conduit, the sealed long bag has a head portion of the sealed long bag. A duct insertion device characterized in that it is inflated and has a substantially tadpole shape defined as a shape in which a central portion and a tail portion of the sealed long bag are deflated, and thrust is provided to the lead-in line .   The pipe line insertion device according to claim 1, wherein a leading end portion of the lead-in line is connected to a rear end portion of the sealed long bag. The sealing length bag, pipe挿線device is formed by a resin of a soft thin-layer material also One請 Motomeko 1, wherein the predetermined maximum volume.   The pipe insertion device according to claim 3, wherein the sealed long bag stores air or gas in an amount that gives the sealed long bag a volume of 10 to 60% of the maximum volume at atmospheric pressure.   The conduit insertion device according to claim 3, wherein the sealed long bag is formed of a resin film. The sealed long bag has a resin bag portion made of a resin film capable of enclosing air therein, and a reinforcing portion having flexibility and at least a longitudinal tensile strength superior to that of the resin bag portion,
6. The conduit according to claim 5, wherein the reinforcing portion is made of a resin member that is thicker than the resin film of the resin bag portion and has a large gap, and is in close contact with the entire outer surface or inner surface of the resin bag portion. Insertion device.   The duct insertion device according to claim 6, wherein the reinforcing portion is in close contact with the entire circumference of the outer surface of the resin bag portion. The sealed long bag has a resin bag portion made of a resin film capable of enclosing air therein, and a reinforcing portion having flexibility and at least a longitudinal tensile strength superior to that of the resin bag portion,
The reinforcing portion extends from the front end portion of the resin bag portion along the outer surface of the resin bag portion and reaches the connecting portion between the lead-in line and the sealed long bag,
The rear end portion of the reinforcing portion is connected to a front end portion of the lead-in line so as to be able to transmit a force.
The line insertion device described.   The duct insertion device according to any one of claims 6 to 8, wherein the reinforcing portion is formed in a net shape or a bowl shape and covers the resin bag portion.   The duct insertion device according to claim 8, wherein the reinforcing portion is configured by a plurality of thread-like or tape-like resin members that are joined to the outer surface of the resin bag portion at a predetermined pitch in the circumferential direction.   The pipeline insertion device according to claim 2, wherein the sealed long bag has a substantially rectangular shape in a flat state in which the air or gas is not sealed.   The duct insertion device according to claim 8, wherein the sealed long bag has a length of 2 to 20 times the width of the sealed long bag in a flat state.   The duct insertion device according to claim 8, wherein the sealed long bag has a length of 4 to 10 times the width of the sealed long bag in a flat state.   The conduit insertion device according to claim 2, wherein the sealed long bag has a hemispherical tip.   The pipe insertion according to claim 2, wherein the sealed long bag is formed by turning the resin bag upside down after being tied or thermally bonded with the front end portion of the rectangular resin bag being flattened in the flat state. Wire device.   The pipeline insertion device according to claim 2, wherein the sealed long bag has an opening for injecting the air or gas at a rear end.   The pipe line insertion device according to claim 16, wherein the sealed long bag is a bag made of a resin film having only one longitudinal end opened. The sealing length bag, pipe挿線apparatus according to claim 2, further comprising a cap with a screw which detachably closes the opening.   The duct insertion device according to claim 2, wherein the sealed long bag is connected to the lead-in line further rearward than a portion where the opening is closed. In the insertion method using the pipe line insertion device according to any one of claims 1 to 19,
The lead-in wire after sealing the sealed long bag after injecting air or gas in an amount that gives the sealed long bag a predetermined volume of the maximum volume of the sealed long bag at atmospheric pressure. Inserting the sealed long bag connected to the one end of the conduit and sucking air in the conduit from the other end of the conduit;
The predetermined ratio is 5 to 70%,
The insertion method according to claim 1, wherein the pipe has an inner diameter with which an outer peripheral surface of the sealed long bag after air or gas is poured can be closely attached.   The insertion method according to claim 20, wherein the predetermined ratio is 10 to 60%.   The air or gas is injected into the sealed long bag in such an amount that at least the outer peripheral surface of the sealed long bag can be in close contact with the entire inner peripheral surface of the pipe in accordance with the inner diameter of the pipe line to be inserted. The insertion method according to 20.

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