JPH06130232A - Method and device for laying and recovering wire - Google Patents

Abstract

PURPOSE:To provide the method and device for laying and recovering a wire capable of simplifying a laying device and more particularly a device for supplying a pressure gas. CONSTITUTION:The pressure gas P introduced from a pressure gas introducing pipe 1b is introduced via a check-valve 1c into a pressure chamber 1a. Since a constant pressure valve 1d is provided on the leading out side of the pressure chamber 1a, the pressure gas is supplied from a leading out pipe if to a tube 3 for transportation when the pressure in the pressure chamber 1a attains the pressure set in the constant pressure valve or above. A communicating wire is housed in the tube 3 for transportation and the communication wire is transferred to a tube 4 for laying by the flow of the introduced gas. The supply of the pressure gas P by a small-sized compressor or hand pump is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying and recovering a wire rod by moving a wire rod such as an electric wire and a communication wire housed in a tubular member to another tubular member using compressed gas. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, as a technique for laying and collecting communication lines, there is a method described in Japanese Patent Application Laid-Open No. 2-72723. This method will be described with reference to FIG. In the figure, 1 is a compressor, 2 is a cable, 3 and 4 are tubular members, 5 and 6 are joints, 9 is a communication line, 10 is an optical fiber element wire, and 11 is a jacket.

FIG. 1A is an explanatory view of a method of laying a communication line in an existing pipeline. The cable 2 is a bundle of a plurality of tubular members 4. The tubular member 4 is laid in advance as the cable 2 in a state where the communication line is not housed therein, and the communication line is laid on the tubular member 4. A cross section of an example of the communication line is shown in FIG. Reference numeral 9 denotes a communication line, which is an assembly of optical fiber strands 10 having 7 cores and covered with a lightweight jacket 11 such as foamed polyethylene. A communication wire to be laid on the tubular member 4 is previously stored in the tubular member 3, and is wound in a coil shape for easy loading. This tubular member 3 is carried into a site where a communication line is to be laid, and one end of the tubular member 3 is joined to an existing tubular member 4 previously laid at the laying site at a joining portion 6 and at the other end at a joining portion 5. The communication line is laid by connecting the compressor 1, flowing a pressure gas, and introducing the communication line from the tubular member 3 not provided to the existing tubular member 4.

FIG. 1B is an explanatory view of a method of collecting the communication line laid on the existing tubular member 4. The communication line joins the tubular member 3 which is not provided to one end of the tubular member 4 at the joining portion 6 and the other end of the tubular member 4 at the joining portion 5,
Connect the compressor 1. The tubular member 3 is empty. By introducing a pressure gas from the compressor 1 to the tubular member 4, the communication wire applied to the tubular member 4 is transferred to and housed in the tubular member 3, and the communication wire can be collected.

According to such a conventional method of laying and collecting communication lines, there is a problem that the transmission speed is very slow especially at the start of transmission. In order to solve this problem, Japanese Patent Application No. 4-57238 proposes a method of varying the supply air pressure to feed the wire.

A large device such as a compressor is used as a device for supplying the pressurized gas. However, the above-described method uses a tubular member that is at least twice as long as the length of the wire to be laid, so that the laying length is limited. Has been used to route communication lines over the relatively short length of conduits. In addition, since such wiring has a wide range of laying points and laying start points on different floors in the building or on the premises, or at distant positions, the work of laying communication lines is virtually It took a lot of labor and time. Moreover,
Since the amount of wire to be laid is small, it is not efficient and there has been a strong demand for simplification of the laying device.

Moreover, in anticipation of expansion of conventional optical networks not only in buildings and premises, but also in other applications,
Since it is considered that the number of optical fibers will be gradually installed on the route where only tubes have been installed beforehand in response to rising communication demand, the installation equipment will be simplified. Doing is a big problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a laying apparatus, and more particularly, a wire laying and collecting method and apparatus capable of simplifying a device for supplying pressurized gas. That is the purpose.

[0009]

According to the present invention, in the invention as set forth in claim 1, the first tubular member accommodating the wire rod and the second tubular member not accommodating the wire rod are joined together. In the method of laying and recovering a wire rod, the wire rod is joined to the first tubular member, pressure gas is supplied from the opposite side of the joint portion, and the wire rod is placed on a pressure gas flow and transferred to the second tubular member side. The gas from the pressure supply source is introduced into the pressure chamber through the check valve, and the pressure gas that has flowed out of the pressure chamber through the constant pressure valve set to the required pressure determined by the length of the laying pipe is used. It is what

According to the second aspect of the invention,
In a wire rod laying / recovering device for transferring the wire rod from a first tubular member accommodating the wire rod to a second tubular member not accommodating the wire rod by applying a pressure gas flow, a check valve is provided. A pressure chamber connected to a pressure gas supply source via the pressure chamber, a constant pressure valve connected to the pressure chamber, and a connection member for introducing the pressure gas led out through the constant pressure valve into the tubular member. To do.

[0011]

According to the present invention, since the pressure gas is guided to the pressure chamber through the check valve and further discharged through the constant pressure valve, it is possible to use a small compressor or a manual pump.
A gas with the required pressure can be obtained. The constant pressure valve is set to be equal to or higher than a required pressure value determined from the length of the laying pipeline.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of an embodiment of a wire laying apparatus of the present invention. In the figure, 1a is a pressure gas introduction pipe, 1
b is a pressure chamber, 1c is a check valve, 1d is a constant pressure valve, 1e is a pressure setting knob, 1f is a pressure gas outlet pipe, 2 is a cable,
3, 4, 7 are tubular members, 5, 6, 8 are joints, and P is a pressure gas. The tubular member 3 is used as a carrying tube, and accommodates a wire rod (not shown) such as a communication line in which the optical fiber strands described in FIG. 3C are assembled in advance. A plurality of tubular members 4 are laid together and laid as a cable 2, and the communication line accommodated in the tubular member 3 is transferred. The tubular member 4 may be one to which another tubular member 7 is connected. The communication line of the tubular member 3 is pressure-fed to the tubular member 4 side by the pressure gas from the pressure outlet pipe 1f.
This is the same as described in (A). Further, by connecting as shown in FIG. 3 (B), the laid communication line can be collected in the carrying tube.

A method of introducing a pressure gas into the tubular member 3 will be described. The pressure gas P is introduced into the pressure introducing pipe 1b. The pressure gas P is introduced into the pressure chamber 1a via the check valve 1c. Therefore, when the pressure of the pressure gas P fluctuates, the pressure gas is introduced into the pressure chamber 1a only when the pressure becomes higher than the pressure of the pressure chamber 1a. Further, since the constant pressure valve 1d is provided on the discharge side of the pressure chamber 1a, when the pressure in the pressure chamber 1a becomes equal to or higher than the pressure set in the constant pressure valve, pressure gas is discharged from the pressure discharge pipe 1f. It can be supplied to the tubular member 3. The pressure of the constant pressure valve 1d can be set by the pressure setting knob 1e.

The setting of the pressure is determined according to the length of the laying pipeline. The inventors examined the use of equipment required for laying. For laying a short distance, a polyethylene tube having an inner diameter of 6 mm is used as the tubular member. An experiment was carried out in which an expanded polyethylene-coated optical fiber having an outer diameter of 2 mm was pressure-fed. FIG. 2 is a diagram showing the experimental results, and shows the required air pressure that enables pumping with respect to the length of the laying tube. At pressures below this pressure, it became clear that the wire would stop and not move at all. It was also clarified that the supply of air below the pressure lower limit pressure does not contribute to the pressure transportation at all.

When the experimental result of FIG. 2 is expressed by a relational expression, (pressure required for pumping) = 0.125 + 0.005 × (tube length).

As the pressure gas P supplied to the pressure chamber 1a, a pressure supply device of small equipment can be used. The pulsating pressure air is stored in the pressure chamber 1a, and in the state where the required pressure is exceeded, the constant pressure valve is opened to supply the gas for the pressure feeding, so that the pressure can be supplied only at the pressure contributing to the pressure feeding. . Since the gas is used only at an effective pressure in this way, less labor is wasted, and it is also possible to use a lightweight device such as a hand pump having a small cylinder capacity as the pressure supply system.

Further, even when a pump whose pressure pulsates at the same time is used, since the pressure chamber is provided, the pulsating component can be suppressed.

A concrete example will be described in more detail with reference to the embodiment shown in FIG. As the tubular member 3 used as the transport tube, a polyethylene tube having an outer diameter of 6 mm, an inner diameter of 4.5 mm and a length of 50 m was used. A wire rod in which two cores of an optical fiber tape coated with an ultraviolet curable resin was coated with foamed polyethylene was placed therein in an amount of 50 m. The cross section of this wire is elliptical with a long diameter of 0.7 mm and a short diameter of 0.4 mm.
A tube 2 having the same diameter and the same material as the above-mentioned carrier tube is used as a tubular member 4, a cable 2 in which a plurality of the tubes are assembled is laid, and a connector is joined to one of the tubular members 4 to obtain a length. It was a 50 m laying tube. To this, one end of the tubular member 3, which is the above-mentioned transport tube, was joined to form a transport conduit.

As the pressure supply device, a hand pump (not shown) was used. As described above, the pump includes the check valve 1c.
Is connected to the pressure chamber 1a via. A connector portion attached to a pressure gas lead-out pipe 1f for leading out pressurized air from a constant pressure valve 1d connected to the pressure chamber 1a was connected to a connector at the other end of the tubular member 3. The set pressure of the constant pressure valve 1d was 0.45 kg / cm ^{2 as} seen from FIG.

When the wire was fed by pushing the pump by hand, it was possible to feed a distance of about 0.4 m with one push of the pump, and with the push of 130 times, from the tubular member 3 in 6 minutes, The full length transfer to the tubular member 4 was possible. The equipment used at this time was a hand pump, a pressure chamber with valves on both sides, no power supply was required, and it was small and lightweight.

[0021]

As is apparent from the above description, according to the present invention, it is possible to lay a short length of wire rod using a very simple facility, so that the length of laying such as in-building wiring and premises wiring is short. In some cases, such as when the laying places are dispersed, there is an effect that the wire can be laid and useful without problems such as equipment transportation and power supply.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a wire laying apparatus of the present invention.

FIG. 2 is a diagram showing a length of a laying tube and an air pressure capable of being pumped.

FIG. 3 is an explanatory view of a method of laying and collecting communication lines in a conventional example.

[Explanation of reference numerals] 1a pressure gas introduction pipe 1b pressure chamber 1c check valve 1d constant pressure valve 1e pressure setting knob 1f pressure gas outlet pipe 2 cable 3,4,7 tubular member 5,6,8 joint part P pressure gas

Claims (2)

[Claims] 1. A first tubular member accommodating a wire rod and a second tubular member not accommodating a wire rod are joined at a joint portion, and pressure is applied from the opposite side of the joint portion of the first tubular member. In a method of laying and recovering a wire, which supplies gas, transfers the wire onto a pressure gas flow, and transfers the wire to the second tubular member side, a gas from a pressure supply source is introduced into a pressure chamber through a check valve, and further, A method of laying and recovering a wire, wherein a pressure gas flowing out from the pressure chamber is used through a constant pressure valve set to a required pressure or more determined by the length of the laying pipeline. 2. From the first tubular member accommodating the wire rod,
In a wire laying / recovering device for transferring the wire onto a second tubular member in which the wire is not housed, the pressure being connected to a source of pressure gas via a check valve. A wire laying / recovering device comprising: a chamber, a constant pressure valve connected to the pressure chamber, and a connecting member for introducing a pressure gas discharged through the constant pressure valve into a tubular member.