JP2011045166A - Wire insertion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily insert a lead-in wire 6 for cable installation into a duct 3 having less power. <P>SOLUTION: A closed long bag 62 made of a resin film filled with a small quantity of air is adopted as a propelling member of a suction-type wire insertion device provided at an end of a lead-in wire 6. The closed long bag 62 has a large deformation capability. The closed long bag 62 is deformed into a shape of a tadpole by air current in the duct and gives a great propelling force to the lead-in wire 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of an insertion device used for inserting a cable into a pipeline.

(Conventional insertion technology)
When laying a cable in an empty or already-laid pipeline, a cable pulling lead is inserted into the pipeline.

  In order to insert the lead-in line into the pipeline, a technique for forming an air flow in the pipeline is known. This airflow gives a propulsive force to the propulsion member fixed to the leading end of the lead-in wire. In the suction system, the air flow is formed by sucking air in the pipe line from one end of the pipe line. In the blowing method, the airflow is formed by blowing air from the other end of the pipeline into the pipeline.

  For example, the following patent document 1 owned by the present applicant employs a tape-shaped lead-in wire. The fluid resistance force formed by the tape provides a driving force to the tape. However, there is a problem that the driving force of the tape is relatively small.

  Parachute-type propulsion members that generate thrust by differential pressure are also known. The differential pressure before and after the parachute gives a large thrust to the parachute.

  However, when the direction of the airflow changes suddenly at a bent portion of the pipe and the rear end opening of the parachute is deflated, the airflow flows around the parachute. As a result, the driving force of the parachute is greatly reduced.

  A number of strings connecting the rear end of the parachute and the leading end of the lead-in line are easily caught by a bent portion of the inner surface of the pipe line or a protrusion on the inner surface of the pipe line. The string twisted by the rotation of the parachute narrows the rear end opening of the parachute. Because of these problems, the parachute type insertion device has not yet reached the practical level.

  In the suction system, a vacuum suction device is used. A flexible air hose is employed to guide the air in the pipe line from the outlet of the pipe line to the suction port of the vacuum suction device.

(First problem of conventional insertion device)
Various obstacles such as rust, water, and existing cables exist in the pipeline. The propulsion member needs to generate a large propulsive force in order to penetrate the lead-in line through the long pipeline. In order to withstand this large thrust, the propulsion member needs to have a large tensile strength. The propelling member needs to have a strength that does not break due to friction with an obstacle in the pipe. The propelling member needs to be flexibly deformed according to the change in the pipe cross-sectional shape. When the propulsive force is reduced by this deformation, the propulsion member is easily stopped.
When water is present in the pipeline, the parachute gets wet. A wet parachute may wither and make it impossible to advance.

  Conventionally proposed various propulsion members have not yet solved the above problem. As a result, much of the line insertion work has been performed by pushing the wire line by human power.

(Second problem of conventional insertion device)
In actual insertion work, it is necessary to insert cables into many types of pipes having different inner diameters. In order to connect the air hose of the vacuum suction device and the pipe line, it is conceivable to provide a bowl-shaped air suction cup at the tip of the air hose.

  However, this bowl-shaped air suction cup needs to be in close contact with the wall surface surrounding the outlet of the conduit. However, when a cable already exists in the pipeline, the bowl-shaped air suction cup cannot be brought into close contact with the wall surface surrounding the outlet portion of the pipeline.

  It is also conceivable to insert the tip of the air hose at the outlet of the pipeline. Even in this case, in order to prevent air leakage, it is necessary to bring the tip of the air hose into close contact with the inner surface of the outlet of the conduit. However, various types of pipes having different inner diameters and existing cables existing in the pipes cause air leakage.

  That is, when the front end portion of the air hose is inserted into the outlet portion of the conduit, air leakage between the outlet portion of the conduit and the front end portion of the air hose becomes a big problem. Conventionally, the idea and effect of a connection method (called an air hose insertion method) in which the tip of an air hose is inserted into the outlet of a pipe line and its problems have not been known at all.

  Eventually, it was found that it was necessary to develop a new air hose structure that could be connected to pipes with a plurality of calibers and had less air leakage.

(Third problem of the conventional insertion device)
Small or large amounts of water are often present in the pipeline. In the suction system, this water is sucked into the vacuum suction device together with air. The sucked water adversely affects the operation of the vacuum suction device and the movement of the propelling member. It is also conceivable to suck in the air in the pipeline after removing the moisture in the pipeline in advance. However, this method requires a significant increase in working time.

  Therefore, it is desirable to separate water from the air stream just before entering the vacuum suction device. However, the advantages of separating water from the air flow in the air hose connecting the pipe line and the vacuum suction device and its specific technique have not been recognized at all.

(Fourth problem of the conventional insertion device)
In buildings under construction or existing buildings, it is necessary to insert many pipes with different diameters, bend shapes, and lengths. As a result, the pulling resistance of the lead-in wire that moves through each pipe line is different.

  Furthermore, the pulling resistance force of the pipe line varies depending on the number of existing cables in the pipe line, the laying state, the presence of foreign matter on the inner surface of the pipe line, and the like.

  In a case where the tensile resistance of the pipe is very large, the small vacuum suction device cannot advance the propelling member in the pipe.

  This problem is particularly noticeable when a large number of existing cables exist in a complicated laid shape in the pipe. In order to improve this problem, it is conceivable to employ a large vacuum suction device in which both the suction air flow rate and the generated vacuum pressure are large.

  However, a large vacuum suction device such as a vacuum car has a large initial cost and running cost. Furthermore, installation becomes difficult in a work environment. It is expected to generate a large suction air flow rate and a large vacuum pressure by a small vacuum suction device that can be easily transported. This need has never been recognized before.

Japanese Patent No. 4117861

(Object of invention)
The first object of the present invention is to provide an insertion device that is excellent in mobility in a pipeline and can generate a large thrust.
The second object of the present invention is to provide an insertion device that can suitably cope with a change in the diameter of a pipeline.
The third object of the present invention is to provide an insertion device capable of improving work efficiency.
The fourth object of the present invention is to provide an insertion device that is easy to operate.

(Characteristics of the invention)
The pipeline insertion device of the present invention for laying a cable in a pipeline has a lead-in wire, a propulsion member, a vacuum suction device, and an air hose.
The propulsion member fixed to the leading end of the lead-in line generates a propulsive force by the air flow in the pipe. As a result, the propulsion member pulls the lead-in line. The vacuum suction device sucks air in the pipeline from the outlet of the pipeline. The air hose communicates the outlet of the pipe line and the vacuum suction device.

(First feature of the insertion device of the present invention)
In the first feature of the present invention, the propulsion member has an outer diameter that can be in close contact with the inner surface of the pipe line, and an axial length in the pipe line direction that is longer than the outer diameter. It is composed of one or more sealed long bags made of an enclosed 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 65% of the maximum volume at atmospheric pressure. By being sucked from the front in the conduit, the air (including gas) in the center and tail of the sealed long bag moves forward. As a result, the head of the sealed long bag swells, and the center and tail of the sealed long bag are deflated. This shape is defined as a substantially tadpole shape.

A sealed long bag in which air is partially injected has excellent deformability. As a result, the sealed long bag can be easily deformed along various obstacles in the pipeline. Further, the sealed long bag can be easily deformed along the bend of the pipeline.
The important point is that despite these deformations, the sealed bag has an excellent line blocking function and low frictional resistance. This is because only the head of the sealed long bag swells outward in the radial direction and adheres closely to the inner surface of the conduit. The reason why only the head of the sealed long bag swells is that the air enclosed in the sealed long bag moves to the head by the air flow in the pipe.

  As a result, air leakage between the sealed long bag and the inner surface of the pipe line is satisfactorily prevented. Further, since the total contact area between the sealed long bag and the inner surface of the pipe line is not large, the frictional resistance is small. Eventually, even if various obstacles are present in the pipe line, they can be deformed accordingly to block the air leakage passage and give a large propulsion to the lead-in line.

  In a preferred embodiment, the leading end of the lead-in wire is connected to the rear end 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, and the sealed long bag is 5 to 65% of the maximum volume of the sealed long bag at atmospheric pressure. The amount of air or gas that gives the volume of the sealed bag is contained.

  That is, a small amount of air is injected into the sealed long bag. If the air volume is too large, the sealed bag cannot pass through the narrow part of the pipe. In addition, the sealed long bag is in close contact with the inner surface of the pipe and the frictional resistance is increased. If the amount of air is too small, the head of the sealed long bag cannot satisfactorily adhere to the inner surface of the pipe line over its entire circumference, and the propulsive force of the sealed long bag decreases due to increased air leakage.

The effect of the sealed long bag will be described in more detail.
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 central part and the tail part of the sealed long bag are subjected to a pressure substantially equal to the atmospheric pressure, even though the air pressure in the duct portion adjacent to the front surface of the head of the sealed long bag is lowered.

  The sealed air at the center and tail of the sealed long bag moves forward. As a result, the central part and the tail part of the sealed long bag are deflated and become string-like. Conversely, the head of the sealed long bag swells. After all, the sealed long bag has a substantially tadpole shape composed of a large head and a string portion extending backward from the head. The head of the inflated sealed long bag is in close contact with the inner surface of the conduit to close the conduit.

  Since only the swollen head of the substantially tadpole-shaped sealed long bag is in contact with the inner surface of the conduit, the friction resistance of the sealed long bag is small.

  The sealed long bag can be flexibly deformed following the bending of the pipeline and the change in the diameter. That is, the head of the sealed long bag becomes thin due to the bending of the pipe line or the change in the diameter. The air in the head moves to the center and tail of the sealed bag.

  As a result, even if the pipe is suddenly bent or thinned, the head shape is deformed accordingly. Even when an existing cable is present in the pipeline, the head shape is smoothly deformed accordingly. Furthermore, the sealed long bag is very light and inexpensive.

  Eventually, this sealed long bag is overwhelmingly superior to a conventionally known parachute or the like as a propelling member for an insertion device.

  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. Preferably, a resin film excellent in wear resistance and tensile strength is employed.

  In a preferred embodiment, the sealed bag has a substantially rectangular shape in a flat state in which air or gas is not sealed. Thereby, a sealed long bag can be manufactured easily.

  The sealed long bag can have the same shape as, for example, a bag containing French bread. For example, the sealed long bag has a length of 2 to 20 times the width of the sealed long bag in the flat state. As a result, it is possible to increase the air resistance of the gap between the sealed long bag and the inner surface of the pipe line and reduce air leakage.

  For example, 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 the flat state. As a result, it is possible to increase the air resistance of the gap between the sealed long bag and the inner surface of the pipe line and reduce air leakage.

In a preferred embodiment, the sealed long bag has a hemispherical tip. As a result, the pipe insertion device can be easily moved and the frictional resistance can be reduced.
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. As a result, the sealed long bag can be easily manufactured at low cost.

  In a preferred embodiment, an amount of air 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 conduit is injected into the sealed long bag in accordance with the inner diameter of the pipeline to be inserted. As a result, a small frictional resistance and a large driving force can be obtained.

In a preferred embodiment, the sealed long bag includes a resin bag portion in which air is sealed, and a reinforcing portion that is in close contact with the surface of the resin bag portion. The reinforcing portion can reduce frictional resistance with the pipe line, reduce breakage of the resin bag part due to friction with the pipe line, and transmit the propulsive force generated by the resin bag part to the rear lead-in line.
In a preferred embodiment, the reinforcing portion is made of a net that covers the resin bag portion. The net reduces frictional resistance and lowers the deformability of the sealed long bag.

(Second feature of the insertion device of the present invention)
In the second feature of the present invention, the air hose for an insertion device is provided with an insertion cylinder formed in a conical cylinder shape with openings at both ends. The distal end portion with a small diameter of the insertion tube is fitted and fixed to the distal end portion of the air hose having a diameter smaller than the diameter of the planned insertion line. The rear end portion having a large diameter of the insertion cylinder is formed larger than the diameter of the planned insertion line.

  This insertion cylinder can satisfactorily prevent air from entering from the outlet side of the pipe into the pipe without any problem even if the inner diameter of the pipe changes variously. Furthermore, the insertion tube can also favorably fix the air hose to the outlet of the conduit. As a result, efforts to hold the air hose at the outlet of the pipeline can be omitted.

  In a preferred embodiment, a rubber layer is formed on the outer peripheral surface of the insertion cylinder. As a result, even if the outlet portion of the pipe line is deformed or bent, the rubber layer is elastically deformed accordingly, so that the air leakage can be prevented with a simple structure.

(Third feature of the wire insertion device of the present invention)
In a third aspect of the present invention, a water droplet separation tank is provided that separates water droplets from an air flow that is provided in the middle of an air hose and is sent to a vacuum suction device. The air hose has a first hose whose front end communicates with the opening of the conduit and a second hose whose rear end communicates with the suction hole of the vacuum suction device. The rear end portion of the first hose and the front end portion of the second hose are suspended from the water droplet separation tank.

  That is, a water droplet separating device interposed in the middle of the air hose separates water droplets from the air flow. As a result, failure of an expensive vacuum suction device can be prevented. Furthermore, since foreign matters such as sand can be separated together with water droplets, foreign matters are prevented from being sucked into the vacuum suction device.

  In a preferred embodiment, a water pump is provided for discharging water accumulated at the bottom of the water droplet separation tank to the outside. Thereby, even if it employ | adopts a small water droplet separation tank, water fills a water droplet separation tank and an operation | work is not interrupted.

In a preferred embodiment, the water pump is fixed to the water droplet separation tank. Thereby, conveyance becomes easy.
In a preferred embodiment, the water pump has a check valve. Thereby, when the water pump is stopped, it is possible to prevent the water droplet separation tank from leaking through the water pump.

(Fourth feature of the wire insertion device of the present invention)
In a fourth aspect of the present invention, the air hose has a plurality of small air hoses having outlet ends that can be individually connected to a plurality of vacuum suction devices. The inlet end portions of the plurality of small air hoses are integrated so that air can be sucked in parallel from one end opening of the pipeline.

  That is, at least the end portion of the air hose connecting the conduit and the vacuum suction device is branched into a plurality of small air hoses. Furthermore, the rear end opening of each small air hose has a shape that can be individually connected to the suction ports of a plurality of vacuum suction devices.

  Each small air hose is individually connected to a plurality of small vacuum suction devices. Each vacuum suction device sucks air in the pipe line. As a result, an air flow having a large flow rate and a large differential pressure can be formed in the pipeline, so that the lead-in wire can be favorably driven even when the tensile resistance of the pipeline is large.

  The end portion of the air hose that branches into a plurality of small air hoses can strongly suck the air in the pipe line by a small vacuum suction device that is easy to move.

  In the end, without using an expensive large-scale vacuum suction device that has both a large air volume and a large suction differential pressure, a general-purpose vacuum suction device with a relatively large suction differential pressure can be used in parallel for reliable insertion in a short time. Line work can be realized.

  When the pipeline length is short or when the frictional resistance of the pipeline is small, some of the plurality of small air hoses are sealed. Thus, the work can be performed with a small number of small vacuum suction devices.

  In a preferred embodiment, the present invention has a conical cylindrical insertion cylinder into which inlet ends of a plurality of small air hoses are inserted. The distal end portion with a small diameter of the insertion cylinder is formed with a smaller diameter than the pipe line to be inserted. The rear end portion having a large diameter of the insertion cylinder is formed to have a larger diameter than the pipe line to be inserted.

  Therefore, the air hose can be set on pipes having various inner diameters. Also, the air hose can be satisfactorily fixed to the outlet of the pipeline by the negative pressure of the pipeline. As a result, it is not necessary to hold the air hose at the outlet of the pipeline in the operation of drawing the lead-in wire in the pipeline.

  The integrated inlet portion of each small air hose may be inserted into the insertion tube so as to be detachable from the insertion tube. The insertion tube and the inlet portion of each small air hose may be integrated.

  In a preferred embodiment, a rubber layer is formed on the outer peripheral surface of the insertion cylinder. In this way, even if the outlet part of the pipeline is uneven or bent due to rust or construction failure, etc., the rubber layer will be elastically deformed accordingly, so the air leakage is simplified by a simple structure. Can be prevented.

  In a preferred aspect, the inlet portions of the plurality of small air hoses are inserted into the insertion tube so as not to leak air and are fixed to the insertion tube. This facilitates prevention of air leakage from the gap between the insertion tube and the small air hose. Furthermore, it is possible to save the trouble of inserting and supporting the inlet portion of each integrated small air hose into the insertion tube.

  In a preferred embodiment, the insertion cylinder has a net-like member for preventing the lead-in wire from entering the inlets of the plurality of small air hoses. The net-like member is disposed in front of the plurality of small air hoses. Thereby, it is possible to prevent the wind receiving member for insertion and the lead-in wire that has moved in the pipeline from entering the small air hose.

  In a preferred embodiment, the apparatus has a hook-shaped member that can be in close contact with the wall surface where the outlet portion of the pipe line is open by surrounding one end opening. The plurality of small air hoses are fixed to the hook-like member so as to be able to suck air that has flowed into the hook-like member from the outlet portion of the pipeline. As a result, the same effects as described above can be obtained. The bowl-shaped member is brought into close contact with the wall surface by the negative pressure formed by the vacuum suction device.

  In a preferred embodiment, the air hose has a large-diameter tip tube portion that is installed at the outlet portion of the conduit so as to be able to suck air. The inlet portions of the plurality of small air hoses are branched in parallel from the tip portion of the air hose. If it does in this way, there can exist an effect similar to the above.

  In a preferred embodiment, it has a cap that is detachably fitted to the outlet of the small air hose. The cap is fixed by a string-like member in the vicinity of the outlet of the small air hose. As a result, an appropriate number of vacuum suction devices can be easily selected in accordance with the pipe line conditions.

  In a preferred embodiment, a water droplet separation tank is provided which has an air suction hole and an air discharge hole at the top and is sealed. The air hose has an upstream hose portion that communicates the outlet portion of the pipe line and the air suction hole of the air hose. The inlet portions of the plurality of small air hoses are coupled to the air discharge holes of the water droplet separation tank.

  As a result, after the water in the pipe line is separated from the air flow by one water droplet separation tank, only the air can be sucked in parallel by each vacuum suction device.

(Fifth feature of the wire insertion device of the present invention)
In the fifth feature of the present invention, the insertion device has a joint hose. This joint hose has an elastic cylindrical member and a suction cylinder part. The elastic cylindrical member has an air chamber and a through hole and is inserted into the outlet of the pipe. The air chamber has an outer diameter larger than the inner diameter of the pipe line in a state where air is infused to the maximum extent, and the fluid is sealed therein. The through hole is formed independently of the air chamber and extends through the elastic cylindrical member in the axial direction. The suction tube portion is inserted into the through hole and sucks the air in the pipe line to the outside. The rear end portion of the suction tube portion is connected to an air hose and sucks air in the pipe line to the air hose.

  As the fluid sealed in the air chamber, air, water, oil, grease, gel, or the like can be employed.

  In short, the elastic cylindrical member is an air bag. This elastic cylindrical member is inserted into the outlet of the pipe. By injecting air into the air bag, the air bag, that is, the elastic cylindrical member is inflated.

  The elastic cylindrical member is constituted by a slightly thick rubber sheet or resin sheet. The elastic cylindrical member, that is, the air bag has a through hole penetrating in the longitudinal direction. The through hole is formed independently of the air chamber, that is, the air chamber inside the elastic cylindrical member.

  After inserting a hard suction cylinder portion into the through hole, air is injected into the air chamber to inflate the elastic cylindrical member. Thereby, the outer peripheral surface of an elastic cylindrical member closely_contact | adheres to the inner peripheral surface of a pipe line. The inner peripheral surface of the elastic cylindrical member facing the through hole is in close contact with the outer peripheral surface of the suction tube portion.

  As a result, it is possible to satisfactorily prevent air leakage through the gap between the elastic cylindrical member and the pipe line and the gap between the elastic cylindrical member and the suction tube portion.

  The elastic cylindrical member has an outer diameter capable of being in close contact with the inner peripheral surface of the pipe line in an air injection state. As a result, by adjusting the air injection, air can be sucked from various pipes with different diameters without air leakage. Further, since the elastic cylindrical member of the joint hose is firmly attached to the inner peripheral surface of the pipe line, it is not necessary for the operator to hold the joint hose and the air hose connected thereto during the work.

  That is, the air hose can be satisfactorily fixed to the outlet portion of the pipeline while preventing air from entering the pipeline from the outlet side of the pipeline with respect to various pipelines having different diameters.

  Furthermore, even if there is an existing cable in the pipeline, the joint hose can be hermetically coupled to the outlet of the pipeline. That is, the elastic cylindrical member of the joint hose can be flexibly deformed according to the existing cable. As a result, air intrusion into the pipeline along the existing cable is satisfactorily prevented by the elastic cylindrical member.

  In a preferred embodiment, the suction tube portion passes through the through hole of the elastic cylindrical member. As a result, the through-hole of the elastic cylindrical member into which the suction cylinder portion is inserted is prevented from being squeezed by a negative pressure when sucking air in the pipe line.

  In a preferred embodiment, a net for preventing lead-in suction is provided at the front end portion or the rear end portion of the suction tube portion. As a result, the lead-in wire is not sucked into the vacuum suction device.

  In a preferred aspect, the suction tube portion is integrally joined to the elastic cylindrical member. Thereby, the number of parts can be reduced.

  In a preferred embodiment, the suction cylinder portion is detachably press-fitted to the elastic cylindrical member. As a result, the deteriorated elastic cylindrical member can be easily replaced.

  In a preferred aspect, the rear end portion of the suction tube portion is configured to be able to adhere to the air hose. As a result, the suction tube portion of the joint hose and the air hose can be easily connected.

  The caliber and end structure of the joint hose can have a known shape and structure that can be connected in an airtight manner in accordance with a certain tip shape of the air hose. Therefore, the air hose can be easily connected to the joint hose. For example, a well-known screw structure or a well-known fitting structure can be adopted as the airtight connection structure.

  In a preferred embodiment, the suction tube portion is formed integrally with the air hose. As a result, it is possible to omit the connection and disconnection work between the suction tube portion of the joint hose and the air hose.

  In a preferred embodiment, the elastic cylindrical member is formed using rubber as a main material. As a result, it is possible to satisfactorily seal the gap between the pipe inner surface and the suction tube portion.

  The outer peripheral surface of the elastic cylindrical member is formed to be harder than the inside of the elastic cylindrical member. As a result, fatigue and wear of the elastic cylindrical member can be suppressed.

  In a preferred aspect, the rear end portion of the elastic cylindrical member is formed to have a larger diameter than the front end portion of the elastic cylindrical member. As a result, since the rear cylindrical portion of the elastic cylindrical member is pressed against the outlet end face of the pipe against the force with which the elastic cylindrical member is drawn into the pipe due to the negative pressure in the pipe, the elastic cylindrical member is Inhalation can be prevented.

  In a preferred embodiment, the suction tube portion has a stopper that is in close contact with the rear end surface of the elastic cylindrical member. As a result, it is possible to prevent the suction tube portion from being sucked into the pipe line.

  In a preferred embodiment, the elastic cylindrical member has a plurality of through-holes that are provided at a predetermined distance from each other. The plurality of suction tube portions are separately inserted into the plurality of through holes of the elastic cylindrical member.

  The plurality of air hoses communicate with the plurality of suction tube portions separately. The plurality of air hoses communicate with the plurality of vacuum suction devices separately. As a result, the air in the pipe line can be strongly sucked by a plurality of vacuum suction devices.

  In a preferred aspect, a plug is attached to and detached from a rear end portion of the suction tube portion that is not communicated with the air hose among the plurality of suction tube portions. As a result, the number of vacuum suction devices used for air suction of the pipe line can be adjusted.

  In a preferred embodiment, there is provided a diameter changing cylinder portion that connects the front end portion of the air hose having a diameter different from that of the rear end portion of the suction tube portion and the rear end portion of the suction tube portion. One end opening of the diameter changing cylinder part has a diameter that can be fitted to the rear end part of the suction cylinder part. The other end opening of the diameter changing cylinder portion has a diameter that can be fitted to the rear end portion of the air hose. As a result, air hoses having different calibers can be airtightly connected to one type of suction cylinder.

  In a preferred embodiment, it has a plurality of aperture changing cylinder portions having different diameters. Thereby, many kinds of air hoses can be airtightly connected to one kind of sucking cylinder part.

  In a preferred embodiment, the elastic cylindrical member has an air inlet that can be closed after injecting air into the air chamber. As a result, it is possible to easily inject air into the air chamber inside the elastic cylindrical member using, for example, an air pump, for example, sealing by screwing a cap, and discharging air from the air chamber.

(Additional information)
The second to fifth features of the present invention described above may not be implemented with the first feature, but may be implemented with a conventionally known suction type propulsion member.

FIG. 1 is a longitudinal sectional view of the line insertion device according to the first embodiment. FIG. 2 is a side view of the sealed long bag shown in FIG. 1. FIG. 3 is a side view showing a modification of the sealed long bag shown in FIG. 1. FIG. 4 is a schematic side view showing a deformed state of the sealed long bag when passing through an obstacle. FIG. 5 is a schematic side view showing a modification of the sealed long bag. (A), (B), (C) and (D) shown in FIG. 5 are schematic side views showing deformed shapes of different sealed long bags. FIG. 6 is a schematic side view of the sealed long bag of the second embodiment. FIG. 7 is a partially enlarged side view of the sealed long bag shown in FIG. 6. FIG. 8 is a schematic side view of the sealed long bag of the third embodiment. FIG. 9 is a partially enlarged side view showing a modification of the sealed long bag shown in FIG. FIG. 10 is an enlarged axial cross-sectional view of the distal end portion of the air hose of the fourth embodiment. FIG. 11 is a longitudinal sectional view showing a water droplet separation tank of Example 5. FIG. 12 is a schematic longitudinal sectional view of the line insertion device according to the sixth embodiment. FIG. 13 is a schematic longitudinal sectional view of an air hose of Example 7. 14 is an enlarged cross-sectional view of the air hose shown in FIG. 13 in the radial direction. FIG. 15 is a longitudinal sectional view showing a water droplet separation tank of Example 8. FIG. 16 is a longitudinal sectional view of an air hose of Example 9. FIG. 17 is a longitudinal sectional view of the air hose of the tenth embodiment. FIG. 18 is a longitudinal sectional view of the air hose of the eleventh embodiment.

  A preferred embodiment of the insertion device of the present invention will be described below.

Example 1
Example 1 will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view of the insertion device of this embodiment. The vacuum suction device 1 is driven by a motor. The air hose 2 made of a rubber cylinder or a resin cylinder is fixed so as to cover the opening on the suction side of the vacuum suction device 1. The vacuum suction device 1 sucks air through the air hose 2.

  A pipe line 3 forming a cable laying pipe is buried under the road. A lead-in wire 6 made of a steel stranded wire is inserted into the conduit 3. Both ends of the pipe line 3 are connected to the side surfaces of the manhole 7 and the manhole 8. A pavement 9 is provided on the surface of the road. The manholes 7 and 8 are separated by a predetermined distance, for example, about 200 meters along the road. The insertion port of the conduit 3 buried in the ground is open to the wall surface of the manhole 8. The outlet portion 31 of the pipe line 3 is open to the wall surface of the manhole 7. The tail portion of the sealed long bag 62 that forms the propulsion member is fixed to the leading end of the lead-in wire 6.

  A bowl-shaped inlet-side cylindrical member 22 is fixed to the tip of the air hose 2. The inlet side cylindrical member 22 forms part of the air hose 2. The inlet side cylindrical member 22 made of a bowl-shaped rubber member is in good contact with the wall surface due to the internal negative pressure. Since the distal end peripheral portion of the inlet side cylindrical member 22 is elastically deformed along the irregularities of the wall surface due to the negative pressure, air leakage is well prevented.

  The inlet-side cylindrical member 22 that is the tip of the air hose 2 covers the outlet 31 of the pipe 3. The peripheral edge of the distal end of the inlet side cylindrical member 22 is in close contact with the side wall surface of the manhole 8. By driving the vacuum suction device 1, the air in the pipe line 3 is sucked through the air hose 2. As a result, due to the pressure difference acting on the sealed long bag 62, the lead-in wire 6 moves in the pipeline 3 toward the outlet portion 31 side.

  A sealed long bag 62 that characterizes this embodiment will be described 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. The sealed long bag 62 is formed in a long cylindrical shape by a polyethylene film having a thickness of several μm to several tens of μm, for example. A small amount of air is sealed in the sealed long bag 62. The opening for air injection provided in the tail part 64 of the sealed long bag 62 is closed. The tail 64 of the sealed long bag 62 is connected to the tip of the lead-in wire 6.

  In the modification shown in FIG. 3, the net-like resin net 66 is bonded to the head 65 of the sealed long bag 62. As a result, it is possible to prevent tearing of the portion of the head 65 of the sealed long bag 62 having the greatest friction with the inner surface of the pipe line 3 and the like of the sealed long bag 62. Further, the resin net 66 reduces the frictional resistance of the sealed long bag 62. After a small amount of air is injected from the tail 64 of the sealed long bag 62, the tail 64 is fastened. As a result, the air inside the sealed long bag 62 is sealed. The amount of air in the sealed long bag 62 is 10 to 60% of the maximum volume of the sealed long bag 62 at atmospheric pressure. The sealed long bag 62 has a length equal to 4 to 10 times its width. The resin film constituting the sealed long bag 62 has a thickness of 10 to 100 μm.

The insertion process using the sealed long bag 62 will be described below.
Long bags of various sizes opened only at one end in the longitudinal direction are brought into the construction site together with the lead-in wire 6, the vacuum suction device 1 and the air hose 2. At the construction site, an appropriate amount of air is blown into a long bag of an optimal size selected according to the diameter of the pipe 3. Thereafter, the sealed long bag 62 is formed by closing the opening of the long bag.

  Next, the sealed long bag 62 is fixed to the leading end of the lead-in wire. The sealed long bag 62 is disposed at the inlet of the conduit 3. An air hose 2 extending from the vacuum suction device 1 is attached to the outlet side of the conduit 3. Thereafter, the vacuum suction device 1 is activated. The head of the sealed long bag 62 is inserted into one end side 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 swells 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. After the lead-in line 6 penetrates the pipe line 3, the sealed long bag 62 is removed from the tip end part of the lead-in line 6. A cable is attached to the tip of the lead-in wire 6. By pulling the lead-in wire 6 in the reverse direction, cable insertion into the pipeline is completed.

  According to this insertion method, a strong propulsive force can be generated by a relatively small power suction device for the reasons already described. Since the amount of air enclosed in the sealed long bag 62 is considerably smaller than the maximum volume of the sealed long bag 62, the sealed air in the sealed long bag 62 is the head of the sealed long bag 62 due to the pressure difference before and after the sealed long bag 62. Is pushed into. 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. Furthermore, the sealed long bag 62 can be flexibly deformed following the bending of the pipe line and the change in the diameter.

  The shape of the sealed long bag 62 when the sealed long bag 62 passes through a narrow part of the pipe 3 is shown in FIG. FIG. 4A shows a state where the head of the sealed long bag 62 is pushed into a narrow part of the conduit 3. FIG. 4B shows a state in which the head of the sealed long bag 62 has almost passed through a narrow portion of the pipe 3.

  When the head of the sealed long bag 62 passes through the narrow part of the conduit 3, the air in the head of the sealed long bag 62 moves backward, so the head of the sealed long bag 62 can easily move the narrowed part. Can pass through. After passing through a narrow portion of the pipe 3, the head of the sealed long bag 62 returns to its original shape due to the forward movement of the internal air.

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. The resin bag 620 initially has a rectangular shape. Only the rear end (right end in the figure) of the resin bag 620 is opened. After injecting appropriate air into the resin bag 620, the opening is closed (FIG. 5B). FIG. 5B shows a state in which the internal air has moved forward.

Another example of the sealed long bag 62 will be described with reference to FIG. A rectangular bag with both ends open is prepared. After the front end of the long bag is tied, the long bag is turned over.
Another example of the sealed long bag 62 will be described with reference to FIG. A small tube portion 623 for blowing air is provided at the rear end portion of the sealed long bag 62. The small tube portion 623 is closed by a cap 624.

(Example 2)
Example 2 will be described with reference to FIG. FIG. 6 is a schematic side view of the sealed long bag 62. However, the sealed long bag 62 is subjected to a differential pressure in the pipe 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.

  FIG. 7 is a schematic partial enlarged side view in which a part of the reinforcing portion 626 is enlarged. The rear end portion (not shown) of the reinforcing portion 626 is connected to the front end of the lead-in wire 6 (not shown) together with the rear end portion (not shown) of the resin bag portion 625.

(Example 3)
Example 3 will be described with reference to FIG. FIG. 8 is a schematic radial cross-sectional view of the sealed long bag 62. The sealed long bag 62 includes a resin bag portion 625 and a reinforcing portion 626 that are joined to each other. The resin bag portion 625 is a sealed bag made of a resin film. The reinforcing part 626 is made of a resin tape 6261 having a strength superior to that of the resin bag part 625.

  FIG. 9 shows a modification of the sealed long bag shown in FIG. A number of short resin tapes 6261 are distributed on the surface of the resin bag portion 625.

Example 4
A fourth embodiment will be described with reference to FIG. FIG. 10 is an enlarged longitudinal sectional view illustrating the tip portion of the air hose 2. The air hose 2 is obtained by changing the tip portion of the air hose 2 shown in FIG. The insertion tube 4 is provided at the tip of the air hose 20 in order to prevent air from entering from the outlet 31 of the pipe 3 into the pipe 3.

  The insertion cylinder 4 is a rubber member formed in a conical cylinder shape with both ends opened. A hose portion 20 made of a resin cylinder passes through the insertion cylinder 4 having a conical cylinder shape. The hose part 20 is fixed to the insertion cylinder 4. The hose portion 20 protrudes from the distal end of the insertion cylinder 4 into the pipe line 3. The wire mesh part 11 is put on the tip part of the hose part 20. The metal mesh part 11 prevents the sealed long bag from being sucked into the hose part 20.

  The front end portion of the air hose 2 made of a rubber cylinder is fitted to the rear end portion of the hose portion 20. The distal end portion of the insertion cylinder 4 is formed smaller in diameter than the pipe line 3. The rear end portion of the insertion tube 4 is formed larger in diameter than the pipe line 3. The distal end portion of the insertion cylinder 4 is inserted from the outlet portion 31 of the pipe line 3 into the pipe line 3.

  Therefore, the conical cylindrical insertion cylinder 4 is in close contact with the outlet 31 of the pipe 3. The insertion cylinder 4 prevents air from entering the pipe 3 from the outlet 31 of the pipe 3. That is, since the insertion cylinder 4 made of a rubber cylinder is easily elastically deformed in accordance with the shape of the outlet portion 31 of the pipe 3, air leakage is prevented.

(Example 5)
A fifth embodiment will be described with reference to FIG. FIG. 11 shows a water droplet separation tank 5 provided in an intermediate portion of the air hose 2. The air blowing cylinder part 51 and the air suction cylinder part 52 are bonded to the opening at the upper end of the water droplet separation tank 5.

  The air hose 2 includes a first hose 2 </ b> A whose front end portion communicates with the outlet portion 31 of the conduit 3, and a second hose 2 </ b> B whose rear end portion communicates with the suction hole of the vacuum suction device 1. In FIG. 11, illustration of the conduit 3 and the vacuum suction device 1 is omitted.

  The rear end portion of the first hose 2 </ b> A is fitted to the air blowing cylinder portion 51. The distal end portion of the second hose 2B is fitted to the air suction tube portion 52.

  The diameter of the rear end portion of the first hose 2 </ b> A is substantially equal to the diameter of the air blowing cylinder portion 51. The diameter of the tip of the second hose 2B is substantially equal to the diameter of the air suction cylinder 52.

  When the vacuum suction device 1 is driven, the air in the conduit 3 is sucked into the vacuum suction device 1 through the first hose 2A, the water droplet separation tank 5 and the second hose 2B and then discharged to the outside. When water, sand, or the like exists in the pipe 3, these foreign substances move to the water droplet separation tank 5 together with the air flow.

  The air blowing cylinder part 51 and the air suction cylinder part 52 are suspended in the water droplet separation tank 5. Therefore, water droplets and sand having a large specific gravity are deposited on the bottom of the water droplet separation tank 5. The wall surface of the water droplet separation tank 5 can have a transparent window.

  Since the air hose 2 has the water droplet separation tank 5, it is possible to prevent water and sand from being mixed into the vacuum suction device 1. As a result, the durability of the vacuum suction device 1 is improved.

  A water pump 100 is fixed to the side surface of the water droplet separation tank 5. The water pump 100 pressurizes the water in the water droplet separation tank 5 sucked from the suction tube portion 101 and discharges the water from the discharge tube portion 102 to the outside. The suction cylinder portion 101 opens at the bottom of the water droplet separation tank 5.

  A water level sensor (not shown) is provided in the water droplet separation tank 5. When the water level in the water droplet separation tank 5 exceeds a predetermined high level, the water level sensor turns on the water pump 100. When the water level in the water droplet separation tank 5 falls below a predetermined low level, the water level sensor turns off the water pump 100. The discharge cylinder part 102 has a check valve (not shown). As a result, after the water pump 100 is turned off, the check valve prevents air from flowing backward from the discharge cylinder portion 102 into the water droplet separation tank 5. By installing the water pump 100, the water droplet separation tank 5 can be greatly reduced in size.

(Example 6)
Example 6 will be described with reference to FIG. FIG. 12 is a schematic longitudinal sectional view showing the overall configuration of the line insertion device of this embodiment. Small vacuum suction devices 1A and 1B are employed for air suction.

  The rubber hose or resin cylinder air hose 2 is composed of two small air hoses 22A and 22B. The outlet of the small air hose 22A is connected to the suction port of the vacuum suction device 1A. The outlet (rear end) of the small air hose 22B is connected to the suction port of the vacuum suction device 1B. The vacuum suction device 1A sucks air through the small air hose 22A. The vacuum suction device 1B sucks air through the small air hose 22B.

  The leading end of the lead-in line 6 exists in the pipeline 3 buried under the road. The manhole 7 and the manhole 8 are arranged at a predetermined distance along the road pavement 9. The inlet portion of the pipe line 3 is open to the wall surface of the manhole 8. The outlet portion 31 of the pipe line 3 is open to the wall surface of the manhole 7. The tail of the lead-in wire 6 is fixed to the propelling member 62.

  The front end portion of the air hose 2 including the small air hoses 22 </ b> A and 22 </ b> B is integrally coupled to the inlet side cylindrical member 22. The rubber inlet side cylindrical member 22 is formed in a bowl shape. The tips of the small air hoses (22A and 22B) protruding into the inlet side cylindrical member 22 suck air.

  The inlet side cylindrical member 22 surrounds the outlet portion 31 of the pipe line 3 and is in good contact with the wall surface of the manhole 7. Air leakage is prevented by elastic deformation of the peripheral edge portion of the inlet side cylindrical member 22.

  A vacuum suction device (1A and 1B) sucks air in the pipe line 3 through the air hose 2. The lead-in wire 6 moves to the outlet portion 31 in the pipe line 3 due to the pressure difference acting on the sealed long bag 62.

  Since the air hose 2 has the small air hoses (22A and 22B) in parallel, two small and lightweight vacuum suction devices can be used simultaneously. As a result, a cooperative suction force can be generated by increasing the air flow rate.

(Example 7)
A line insertion device of Example 7 will be described with reference to FIG. FIG. 13 is a schematic enlarged longitudinal sectional view illustrating the distal end portion of the air hose 2 in an enlarged manner. This insertion device is characterized in that the structure of the tip of the air hose 2 shown in FIG. 12 is changed.

  The tip ends of the hose portion 20A and the hose portion 20B are fixed in the insertion tube 4 having a conical cylinder shape. The rubber insertion cylinder 4 has a conical cylinder shape with openings at both ends in order to prevent air from entering from the outlet 31 of the pipe 3 into the pipe 3. The seal member 12 is filled in a gap between the outer peripheral portions of the hose portion 20 </ b> A and the hose portion 20 </ b> B and the inner peripheral surface of the insertion cylinder 4. The seal member 12 joins the hose part 20 </ b> A and the hose part 20 </ b> B to the insertion cylinder 4.

  A wire mesh part 11 is put on the tip of the insertion cylinder 4. The metal mesh part 11 prevents the sealed long bag from being sucked into the insertion cylinder 4. The tip of the small air hose 22A is put on the rear end of the hose 20A. The small air hose 22A is made of, for example, a rubber cylinder or a flexible resin cylinder.

  The small-diameter distal end portion of the insertion tube 4 protrudes further forward than the distal ends of the hose portion 20A and the hose portion 20B. The distal end portion of the insertion cylinder 4 having a diameter smaller than that of the pipe line 3 is inserted into the outlet part 31 of the pipe line 3. The rear end portion of the insertion tube 3 is formed larger in diameter than the pipe line 3. Since the insertion cylinder 4 has a conical surface, the outer peripheral surface of the insertion cylinder 4 can be brought into close contact with the outlet portion of the pipe line 3 having various inner diameters.

The rubber insertion cylinder 4 satisfactorily prevents air leakage from the gap between the insertion cylinder 4 and the outlet portion 31 of the conduit 3.
The insertion cylinder 4 is drawn into the pipe line 3 by air suction. The insertion cylinder 4 is stably held at the outlet portion of the pipe line 3. The wire mesh 11 fixed to the distal end surface of the conical cylindrical insertion tube 4 stops the advancement of the incoming wind receiving member 62.

  The rear end portion of the hose portion 20B is sealed with a cap 6261. When it is necessary to increase the air flow rate in the pipeline 3, a small air hose 22B (not shown) is connected to the hose portion 20B. The small air hose 22A and the small air hose 22B suck the air in the pipe line 3 independently from each other by different vacuum suction devices.

(Modification)
The hose portion 20A and the hose portion 20B can protrude forward from the insertion tube 4 as in FIG.
(Modification)
The air hose 2 can be composed of three or more small air hoses. FIG. 14 shows a mode in which four hose portions (201, 202, 203, and 204 are inserted into the insertion cylinder 4 shown in FIG. 12. In this mode, a tube is formed by using four vacuum suction devices. The air flow rate in the path 3 is almost quadrupled.

(Example 8)
An insertion device according to Example 8 will be described with reference to FIG. FIG. 15 shows a water droplet separation tank 5 provided in an intermediate portion of the air hose 2. A resin-made air blowing cylinder portion 51 and an air suction cylinder portion 52 are bonded to the opening at the upper end of the water droplet separation tank 5.

  The air hose 2 includes a first hose 2A and a second hose 2B. The tip of the first hose 2 </ b> A connects the outlet part 31 of the figure line 3 and the air blowing cylinder part 51. The second hose 2B includes a small air hose 22A that connects the air suction tube portion 52 and the vacuum suction device 1A (not shown), and a small air hose 22B that connects the air suction tube portion 52 and the vacuum suction device 1B (not shown). Have.

The 1st hose 2A consists of one large diameter air hose. The inlet side cylindrical member 22 (see FIG. 12) or the insertion cylinder 4 (see FIG. 13) is placed on the tip of the first hose 2A.
The second hose 2 </ b> B has a large-diameter tip cylinder part 22 </ b> E that is fitted to the air suction cylinder part 52. The small air hoses 22A and 22B are inserted into the distal end cylindrical portion 22E. The rear end portion of the small air hose 22A is connected to the suction port of the vacuum suction device 1A. The rear end portion of the small air hose 22B is connected to the suction port of the vacuum suction device 1B.

  The air in the water droplet separation tank 5 is sucked into the vacuum suction devices (1A and 1B) through the small air hoses (22A and 22B). The vacuum suction devices (1A and 1B) suck the air in the pipe line 3 through the first hose 2A, the water droplet separation tank 5 and the second hose 2B. When water, sand, or the like is present in the pipeline 3, these foreign substances move from the pipeline 3 to the water droplet separation tank 5 through the first hose 2A.

Since the air blowing cylinder part 51 and the air suction cylinder part 52 hang down in the water droplet separation tank 5, heavy water droplets and sand accumulate on the bottom of the water droplet separation tank 5. A transparent window can be provided on the wall surface of the water droplet separation tank 5.
The air hose 2 having the water droplet separation tank 5 prevents water and sand from entering the vacuum suction device 1. As a result, the operational reliability of the vacuum suction device 1 is greatly improved.

(Modification)
In the case where the pipe line 3 is short, the rear end portion of some small air hoses can be closed.

Example 9
A line insertion device according to Embodiment 9 will be described with reference to FIG. FIG. 16 is a schematic vertical cross-sectional view illustrating an enlarged vicinity of the air hose of the wire insertion device. In this embodiment, the hose part 20 described above is omitted. The air hose 2 is composed of three small air hoses (22A, 22B and 22C). The distal end portions of the small air hoses (22A, 22B, and 22C) protrude further forward than the distal end surface of the conical tubular insertion tube 4.

  Small air hoses (22A, 22B and 22C) are connected to three vacuum suction devices. In FIG. 16, only two vacuum suction devices (1A and 1B) are shown.

  The tip portions of the small air hoses (22A, 22B and 22C) are integrated. The distal ends of the small air hoses (22A, 22B, and 22C) are detachably inserted into the conical tubular insertion tube 4. The operator can insert the tip of the small air hose (22 </ b> A, 22 </ b> B and 22 </ b> C) into the air suction cylinder 52 of the water droplet separation tank 5. The wire mesh 11 is put on the tip of small air hoses (22A, 22B and 22C). The wire mesh 11 stops further progress of the sealed long bag.

(Example 10)
The line insertion device of Example 10 will be described with reference to FIG. FIG. 17 is an enlarged cross-sectional view of a main part of the wire insertion device according to this embodiment.
An air hose 2 made of rubber or resin extends from the vacuum suction device 1. The pipeline 3 is buried under the road. The pipe line 3 is exposed from the concrete wall 70 of the manhole 7. A bell mouth is attached to the end of the conduit 3.

  The insertion cylinder 4 that characterizes this embodiment includes an elastic cylindrical member 41 and a suction cylinder portion 42. The elastic cylindrical member 41 includes a front cylinder part 624, a bag part 625 made of a rubber sheet or a resin sheet, a rear cylinder part 626, and an air injection cylinder part 411 for injecting air into the air chamber 625. An air chamber filled with air is formed in the bag portion 625.

  The front cylinder part 624 is integrally formed with the bag part 625 by resin or rubber. The front tube portion 624 protrudes forward from the front end surface of the bag portion 625. The rear cylinder portion 626 protrudes rearward from the rear end surface of the bag portion 625. The resin cap 29 seals the air injection tube portion 411.

  A front end portion of the elastic cylindrical member 41 is inserted into the conduit 3. The rear end portion of the elastic cylindrical member 41 protrudes outside the pipe 3. Since air is injected into the bag portion 625, the rear end portion of the expanded elastic cylindrical member 41 is larger in diameter than the inner diameter of the pipe line 3. The elastic cylindrical member 41 into which air is not injected has a cone shape with a flat tip surface.

  The suction cylinder part 42 penetrates the bag part 625, the front cylinder part 624 and the rear cylinder part 626 of the elastic cylindrical member 41. The front cylinder part 624 and the rear cylinder part 626 are bonded to the outer peripheral surface of the suction cylinder part 42. The bag portion 625 can be sealed. The front cylinder part 624 and the rear cylinder part 626 can be fastened to the suction cylinder part 42. The front end portion of the suction tube portion 42 protrudes forward from the front tube portion 624 of the elastic cylindrical member 41.

  The rear end portion of the suction tube portion 42 protrudes rearward from the rear tube portion 626 of the elastic cylindrical member 41. The front end portion of the air hose 2 is fitted to the rear end portion of the suction tube portion 42.

(Work procedure)
First, at least the front end portion of the elastic cylindrical member 41 is inserted into the conduit 3 in a state where air is not injected into the bag portion 625 of the elastic cylindrical member 41. The suction cylinder part 42 penetrates the bag part 625 in advance.

  Next, after air is injected from the air injection tube portion 411 into the bag portion 625 of the elastic cylindrical member 41, the air injection tube portion 411 is closed by the resin cap 29. Thereby, the elastic cylindrical member 41 is in close contact with the pipe line 3.

  Thereafter, the air hose 2 is connected to the rear end portion of the suction tube portion 42 and the vacuum suction device (not shown) is operated to suck the air in the pipe line 3 through the air hose 2 and the insertion tube 4. As a result, the air in the bag portion 625 of the elastic cylindrical member 41 is also urged into the pipe 3. However, if the frictional force between the elastic cylindrical member 41 and the pipe 3 is large, the elastic cylindrical member 41 is Inhalation is prevented.

  The rear end portion of the elastic cylindrical member 41 is preferably formed larger in diameter than the front end portion. More preferably, the rear end portion of the elastic cylindrical member 41 in an expanded state has an outer diameter larger than the inner diameter of the pipe line 3. Thereby, since the rear end part of the elastic cylindrical member 41 is pressed against the outlet end surface of the pipe line 3, the elastic cylindrical member 41 is prevented from being sucked into the pipe line 3.

  The vacuum suction device can strongly suck the air in the pipe line 3 without air leakage. As a result, the sealed long bag connected to the leading end portion of the lead-in line 6 in the pipe line 3 generates a strong thrust. One type of insertion tube 4 can be connected to many types of pipes 3 having different diameters.

  Furthermore, even when a cable is present in the conduit 3, the elastic cylindrical member 41 of the insertion tube 4 is elastically deformed so as to enclose the existing cable, so that air intrusion into the conduit 3 is prevented. The joint hose 4 pushed into the pipe 3 does not require support from the operator.

  The elastic cylindrical member 41 is satisfactorily airtightly fitted to the pipe line 3 formed of a corrugated pipe or a spiral pipe. The net 5 provided on the distal end surface of the suction tube portion 42 prevents the sealed long bag connected to the distal end of the lead-in wire 6 from entering the joint hose 4 and the air hose 2 deeply. The net 5 can be provided at the outlet of the joint hose 4.

  The suction cylinder portion 42 may be detachable without being bonded to the elastic cylindrical member 41. The suction cylinder part 42 and the air hose 2 may be provided integrally, and the tip part of the air hose 2 may also serve as the suction cylinder part 42.

(Example 11)
An insertion device of Example 11 will be described with reference to FIG. FIG. 18 is an enlarged side view of a main part of the wire insertion device according to this embodiment.
This embodiment is characterized in that the insertion tube 4 has a plurality of suction tube portions 42. In FIG. 18, only two suction cylinder portions 42 are illustrated.

  The insertion tube 4 has four suction tube portions 42. FIG. 18 shows only two suction cylinder portions 42. The four suction cylinder portions 42 extend substantially in parallel. Three of the four suction tube portions 42 communicate with different vacuum suction devices through different air hoses 2. The outlet of the rear end portion of the remaining one suction tube portion 42 is closed by a rubber cap 6261.

  Therefore, the air in the pipe line 3 is strongly sucked by the three vacuum suction devices. When the pipe line 3 is short, a rubber cap 6261 is put on the outlet end of the unnecessary suction cylinder part 42.

1 Vacuum suction device (vacuum suction device)
2 Air hose 3 Cable laying pipe (pipe)
4 Insertion tube 5 Water drop separation tank 6 Lead-in line 7 Manhole 8 Manhole 9 Road pavement 31 Pipe outlet 62 Propulsion member (long bag)

Claims (25)

A lead-in wire for laying the cable in the conduit, a propulsion member fixed to the tip of the lead-in wire and energized by air in the conduit to pull the lead-in wire, and the propulsion member In a wire insertion device having a vacuum suction device for suction, and an air hose for a wire insertion device communicating the one end opening of the pipe line and the vacuum suction device for the suction,
The propulsion member has a soft thin layer having an outer diameter that can be in close contact with the inner surface of the pipe line and an axial length in the pipe line direction that is longer than the outer diameter and in which air or gas is partially enclosed. Has a sealed long bag made of material,
The sealed long bag contains air or gas in an amount that gives the sealed long bag a volume of 5 to 65% 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. An 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 wire.   The line insertion device according to claim 1, wherein the sealed long bag includes a resin bag portion in which air is sealed and a reinforcing portion that is in close contact with a surface of the resin bag portion.   The pipe line insertion device according to claim 2, wherein the reinforcing portion is a net that covers the resin bag portion. The insertion device according to claim 1,
The wire insertion device air hose has an insertion tube formed in a conical tube shape with open ends,
The distal end portion having a small diameter of the insertion tube is fitted and fixed to the distal end portion of the air hose for the insertion device having a diameter smaller than the diameter of the planned insertion line,
The insertion device according to claim 1, wherein a rear end portion having a large diameter of the insertion tube is formed to be larger than a diameter of the planned insertion line. The insertion device according to claim 4,
An insertion device in which a rubber layer is formed on an outer peripheral surface of the insertion cylinder. The insertion device according to claim 1,
A water droplet separation tank that separates water droplets from an air flow that is provided in the middle of the air hose for the wire insertion device and is sent to the vacuum suction device;
The air hose for the wire insertion device has a first hose whose front end portion communicates with the opening of the pipe line, and a second hose whose rear end portion communicates with the suction hole of the vacuum suction device,
The rear end portion of the first hose and the front end portion of the second hose are insertion devices that hang from the water droplet separation tank. The insertion device according to claim 6,
An insertion device having a water pump for discharging water accumulated at the bottom of the water droplet separation tank to the outside. The insertion device according to claim 7,
The water pump is an insertion device fixed to the water droplet separation tank. The insertion device according to claim 7,
The water pump is an insertion device having a check valve. The insertion device according to claim 1,
The air hose has a plurality of small air hoses having outlet ends that can be individually connected to the plurality of vacuum suction devices,
An insertion device in which inlet end portions of the plurality of small air hoses are integrated so that air can be sucked in parallel from one end opening of the pipe. The insertion device according to claim 10,
A conical cylindrical insertion cylinder into which the inlet ends of the plurality of small air hoses are inserted;
The distal end portion having a small diameter of the insertion tube is formed to have a smaller diameter than the pipe line to be inserted,
The insertion device in which a rear end portion having a large diameter of the insertion cylinder is formed to have a larger diameter than the pipe line to be inserted. The insertion device according to claim 10,
The wire insertion device in which the inlet end portions of the plurality of small air hoses are inserted into the insertion tube so as not to leak air and are fixed to the insertion tube. The insertion device according to claim 10,
The insertion cylinder has a net-like member for preventing the lead-in wire from entering the inlet end of the plurality of small air hoses,
The net-like member is a wire insertion device arranged in front of the plurality of small air hoses. The insertion device according to claim 10,
Having a bowl-shaped member that can be in close contact with the wall opening the one end opening of the pipe, surrounding the one end opening;
The plurality of small air hoses are insertion devices that are fixed to the hook-like member so as to be able to suck air that has flowed into the hook-like member from the one end opening of the pipe line. The insertion device according to claim 10,
The air hose is
A large-diameter tip tube portion that is installed in the one end opening of the conduit so as to be capable of air suction,
The wire insertion device in which the inlet end portions of the plurality of small air hoses are branched in parallel from the distal end tubular portion of the air hose. The insertion device according to claim 10,
Having a water droplet separation tank sealed with an air suction hole and an air discharge hole at the top;
The air hose has an upstream hose portion that communicates the one end opening of the conduit and the air suction hole of the air hose,
The inlet device of the plurality of small air hoses is an insertion device coupled to the air discharge hole of the water droplet separation tank. The insertion device according to claim 1,
An elastic cylindrical member having an air chamber having an outer diameter larger than the inner diameter of the pipe and enclosing air; and a through hole formed independently of the air chamber and penetrating in the axial direction; A joint hose having a suction cylinder portion inserted into the through hole and sucking out the air of the pipe line to the outside;
The elastic cylindrical member is inserted into an outlet portion of the pipeline,
The rear end part of the said suction cylinder part is connected with the said air hose, and is a wire insertion apparatus which sucks out the air in the said pipe line to the said air hose. The insertion device according to claim 17,
The suction tube portion is an insertion device that passes through the through hole. The insertion device according to claim 17,
An insertion device having a net for sucking a lead-in wire at a front end portion or a rear end portion of the suction tube portion. The insertion device according to claim 17,
The said insertion cylinder part is a wire insertion apparatus joined integrally with the said elastic cylindrical member. The insertion device according to claim 17,
The suction tube portion is a wire insertion device that is press-fitted to the elastic cylindrical member in a detachable manner. The insertion device according to claim 17,
The rear end part of the said suction cylinder part is an insertion apparatus comprised so that contact | adherence to the said air hose is possible. The insertion device according to claim 17,
The suction tube portion is an insertion device coupled to the air hose. The insertion device according to claim 17,
The insertion device in which the rear end portion of the elastic cylindrical member is formed larger in diameter than the front end portion of the elastic cylindrical member. The insertion device according to claim 17,
The elastic cylindrical member has a plurality of the through holes penetrating at a predetermined distance from each other,
A plurality of the suction tube portions are separately inserted into the plurality of through holes of the elastic cylindrical member,
The plurality of air hoses communicate separately with the plurality of suction tube portions,
The plurality of air hoses are insertion devices that communicate with a plurality of vacuum suction devices separately.

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