JPH0418957A - Method and apparatus for coating underground piping - Google Patents

Abstract

PURPOSE:To apply paint on the inner surface of the pipes in a constructed state by passing a traction rope slidably into a substitution packing, and inserting the substitution packing into the pipes by the length corresponding to the required amount of paint. CONSTITUTION:The traction rope 3 is inserted from one side of an underground piping 1 to the other end side from which the tip of the traction rope 3 is drawn out by a suitable traction means. A coating unit 8 is connected by a connection wire 3' with a specified distance and the coating cup 8b of the coating unit 8 is revolved, and a rear packing 6, a battery case and battery 7, 7b, and the coating unit 8 are drawn by the traction rope 3, and the substitution packing 4, a middle packing 5, and paint 10, 10' which are in front of the rear packing 6 are pushed forwards, while the paint 10' is sent to the coating unit 8 through paint pipes 6a, 8a and a paint hose 9 to coat the inner surface of the pipe by the coating unit 8. By this method, the coating in a narrow space is easily carried out.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to a plurality of rows of conduits forming cable lead-in conduits for wiring telecommunications cables underground between manholes. The present invention relates to a method and apparatus for painting underground pipes, which can apply paint to the inner surface of empty pipe bodies and pipe joints from the inner surface of the pipes while they are still installed.

(Prior Art) Conventionally, underground conduits for wiring telecommunications cables, etc., laid underground between manholes, are usually made by connecting multiple pipes up and down between vertical holes such as manholes. This system consists of multiple stages and multiple rows on the left and right and laid underground under the road to form a +X conduit. A method is adopted in which the route is selected and the route is brought in and interposed.

By the way, pipe body 1 of the existing underground F pipe, steel pipe 2 is a cast iron pipe connected by a pipe joint, and rust has formed in this pipe joint over time and has spread inside the pipe. The joint may become "knot-like" and reduce the effective diameter of the pipe, or the joint state of the pipe joint may change due to deterioration of the sealing material, the load and vibration of vehicles passing over the pipe, ground F, etc. Gaps (7) Foreign matter such as water or dirt can enter and block the pipes, so even if you try to install a new cable, it may become impossible to insert the cable. It is considered possible to paint the pipe from the inside while it is still installed.

The above-mentioned methods for painting pipes include: (1) A method in which paint is injected into the underground pipe and an elastic body is pulled from behind to form a thin coating film between the elastic body and the inner wall of the pipe.

■ A method of attaching an inverted resin-containing hose to the inner surface of an underground pipe while rotating it in the normal direction using compressed air, and forming an inner pipe with the resin-containing hose inside the underground pipe.

■ A method in which one-component or two-component paint is supplied from above ground using a paint supply pump, etc. to a coating machine in an underground pipe, and the coating machine is towed to form a thin coating film inside the pipe.

etc. have been proposed.

(Problem to be solved by the invention) However, as described in (■), by injecting paint into the underground pipe and pulling the elastic body from behind, it is possible to form a thin coating film between the elastic body and the inner surface of the pipe. In the forming method, if the elastic body deviates from the center of the tube and comes into contact with the inner wall of the tube, the paint will not be applied to that area. Furthermore, the method described in (2) uses a resin-containing hose, which results in high material costs, and requires a large compressor, which makes the process uneconomical. Furthermore, in the method for repairing underground pipes using a coating machine described in ■, the supply of paint to the coating machine is done using above-ground paint! 1. Due to supply voltage, etc.
Applying one-component or two-component paint to a long length according to the length of the repair.The paint must be supplied to the coating machine in the pipeline by a hose, and the paint supply pump, paint hose, and power source. There was a problem in that a generator and a truck were required to load them, which required a large amount of capital investment.

This invention solves the problems of the prior art described above, and its purpose is to solve the problems of the prior art described above. ``By supplying paint from inside the underground pipe to a coating machine inserted into the F pipe, there is no need for a paint supply pump or long paint hose, and the underground pipe can be painted economically and easily. An object of the present invention is to provide a road painting method and apparatus.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, claim (1) of the present invention provides a method for installing an underground conduit in a plurality of rows of underground conduits for wiring telecommunication cables etc. underground between manholes. This is a method of painting underground pipelines in which paint is applied to the inner surface of the pipe body and pipe joints from the inner surface of the pipe while it is still installed, and the tow cable is slidably inserted into the replacement packing. Meanwhile, the replacement gasket is inserted into the tube by a length corresponding to the required amount of paint, paint is injected, the tow cable is connected to the rear gasket, and the rear gasket and battery case are connected by a connecting wire. The present invention is further characterized in that the battery case and the paint machine having the paint cup are connected by a connecting wire, and then the tow rope is pulled while the paint cup is rotated.

In addition, claim (2) of the present invention is directed to the inner surface of an empty pipe body and a pipe joint among multiple rows of underground pipes for wiring telecommunication cables underground between manholes. It is an underground pipe coating device that applies paint from the inner surface of the pipe while it is installed, and is inserted from one of the open ports at both ends of the pipe body to the other, and is pulled by a pulling means on the other open port side. The outer periphery of the tow rope is in airtight contact with the inner surface of the pipe, and the tow rope is slidable relative to the tow rope, and while pressurizing the paint at the rear, the water and air present at the pipe joint are mixed with non-paint and paint. a replacement gasket that replaces the pipe, a rear gasket whose outer periphery is in airtight contact with the inner surface of the tube, and which is connected to the tow cable and pushes the paint in the front along the inside of the tube; and a rear gasket that is the power source for the paint machine! ＼By connecting the terry case and a coating machine that paints the inner surface of the above-mentioned pipe, passing the pipe through the above-mentioned rear packing, connecting the pipe and the coating machine with a hose, and being towed by the rear packing tow cable, It is characterized by a structure in which the rear packing can supply paint from the front to the coating machine.

Furthermore, claim (3) of the present invention is characterized in that a lip made of an elastic body and having an outer diameter larger than the inner diameter of the tube is provided on the outer periphery of the rear packing and/or the battery case.

Further, claim (4) of the present invention is characterized in that an intermediate packing is provided between the replacement packing and the rear packing, the outer periphery of which is in airtight contact with the inner surface of the tube, and is slidable relative to the tow cable. .

(Function) According to the inventions of claims (+) and (2), since paint can be directly supplied to the coating machine from within the ground pipe, paint supply pumps, paint hoses, etc. are unnecessary. It is economical because it does not require a large amount of capital investment.

Furthermore, according to the invention of claim (3), after the paint that has replaced non-paints such as water and air existing in the pipe joint by the displacement gasket passes through the rear gasket, it naturally falls due to its own weight, and the paint falls to the lower part. It is possible to remove the paint accumulated in the pipe from the pipe joint, and the inner surface of the pipe can be painted without narrowing the inner diameter of the pipe.

Further, according to the invention of claim (4), the pressure of the paint between the replacement packing and the intermediate packing decreases due to depressions in the pipe joint part, but the paint pressure between the intermediate packing and the rear packing is preliminarily applied to the pipe. The hollows in the joint are filled with paint, so the paint pressure hardly decreases, and it is possible to supply a constant amount of paint to the paint machine, forming a smooth paint film on the inside of the pipe. .

(Example) Hereinafter, an example according to the present invention will be described in detail based on the attached drawings.

FIG. 1 is a sectional view schematically showing the main parts of an embodiment of the underground pipe coating apparatus according to the present invention, and in the figure, reference numeral 1 indicates the underground pipe to be painted. This underground pipe 1
is usually made by connecting steel pipes or cast iron pipes 1a with a diameter of 75m11 to 100n+n to a predetermined length between manholes using a plurality of pipe joints 2. They are arranged vertically and horizontally at intervals, forming an underground pipe 1 laid underground.

A telecommunication cable is inserted into this underground conduit 1. Therefore, this device is used to paint empty pipes in which no cables are inserted among the plurality of rows of underground pipes 1.

When painting the empty pipes of the above-mentioned underground conduit 1, painting is carried out starting from the open ends at both ends, with the spaces between opposing manholes, which are open at both ends of the underground conduit 1, being treated as painting units. A towing cable 3 is inserted from one end of the underground conduit 1 toward the other end, and the tip of the towing cable 3 is pulled out from the other end and pulled by an appropriate traction means.

Further, a replacement packing 4 and an intermediate packing 5 are slidably inserted into the traction cable 3 and connected to a rear packing 6. Battery case (battery) 7, (7b) ・
The paint sprayers 8 are connected at a predetermined interval via a connecting wire 3', and by rotating the painting cup 8b of the paint sprayer 8 and pulling the tow rope 3, the rear gasket 6 and the rear gasket 6 are connected. Battery case (battery)7. (7
b) The coating machine 8 is towed and pushes the replacement seal 4, the intermediate seal 5, and the paint N10 and 10' in front of the rear seal 6, and the paint 10° is moved by the paint pipe a and 8a.
The paint is sent to the coating machine 8 via the paint hose 9, and the coating machine 8 coats the inner surface of the tube.

Furthermore, in the case of FIG. 2(a), the paints 10, 10 are pushed under a constant pressure, and the paints 10 are
A fixed amount of paint 10 is supplied to the paint machine 8 via the paint hose 9 and the paint hose 9.
Furthermore, in the case of FIG. The pressure decreases temporarily when replacing the paint 10', or the friction force between the intermediate gasket 5 and the inner surface of the tube is much larger than the decrease in the pressure of the paint 10, and the pressure of the paint 10' affects the amount of paint supplied. A fixed amount of paint 10' can be supplied to the coating machine 8 through the paint pipe a and the paint hose 9 without changing much.

In addition, in the case of FIG. 2(C), after the paint 10, which has been replaced with non-paint such as water and air existing in the pipe joint 2 by the displacement gasket 4, passes through the rear gasket 6, it is naturally caused by its own weight. This accumulated paint 10 falls and accumulates at the bottom of the pipe.
" can be removed by the lip 7a which is slightly larger than the inner diameter of the tube. Furthermore, in the case of FIG. The centrifugal force generated allows the paint 10 to be sent in fixed amounts to the paint sprayer 8 via the paint pipe a 8a and the paint hose 9, which is then atomized and sprayed onto the inner surface of the tube, thereby making it possible to paint the paint.

The above replacement packing 4 is shown in Fig. 1, Fig. 2, and Fig. 3 (a).
Since it is configured as shown in (b), it is possible to replace the paint 10 with non-paint, such as water or air, present in the pipe joint 2. The key material is made of an elastic material, has an outer periphery in airtight contact with the inner surface of the tube, is slidable on the tow rope 3, and is integrally fixed by tightening the front and rear parts with washers, stud bolts, etc.

In addition, the intermediate packing 5 is shown in FIGS. 1, 2, and 4 (a).
) As shown in (b), the material is made of an elastic body, the outer periphery is in airtight contact with the inner surface of the tube, it is slidable on the tow rope 3, and the front and rear parts are tightened with washers, stud bolts, etc., and are fixed integrally. There is.

In addition, the rear packing 6 is shown in Figs. 1, 2, and 5 (a
) Since the shape is as shown in (b), the paint pipe a
It is possible to deliver the paint 10' via. The material is an elastic body, and the outer periphery is in airtight contact with the inner surface of the tube, and is connected to the tow rope 3.
Tighten with J.

It is integrally fixed.

Also, No. 1. Terry case 7 is shown in Figures 1, 2, and 6.
As shown in Figures (a) and (b), the material is m+4 and has an 11 knob 72 that is slightly larger than the inner diameter of the pipe (-, with a built-in hatch leaf b. It is now possible to do so.

In addition, the coating machine 8 is shown in FIGS. 1, 2, and 7 (a)
), it is made of steel, has a built-in motor powered by a battery 7b, and is capable of rotating a painted cup 8b attached to the tip.

Next, painting the underground conduit based on the above configuration -■.

Explain the law.

First, the towline 3 is passed through the replacement gasket 4 and the intermediate gasket 5, and the replacement gasket 4 is inserted into the pipe by a length corresponding to the required amount of the paint 10. After injecting the paint 1o, the intermediate gasket 5 is transferred to the paint 10'. A length corresponding to the required amount of paint 10' is inserted into the tube and the paint 10' is injected. Further, the tow rope 3 is connected to the rear gutskin 6, the terry case 7 and the paint machine 8 are sequentially connected by the connecting wire 3', and the paint cup 8b is rotated to tow the tow rope 3.

Next, by pulling the tow rope 3, the rear packing 6 and the rear battery case (battery) 7. (7b
)・The coating machine 8 is towed and pushes the replacement packing 4 in front of the rear packing 6, the intermediate packing 5, and the paint 10 and 10', and the paint 10' is transferred through the paint pipe a 8a and the coating hose 9. It is sent to the coating machine 8, and the coating machine 8 coats the inner surface of the tube.

Furthermore, when the displacement packing 4 reaches the pipe joint 2, the pressure of the paint 10 decreases temporarily when the displacement packing 4 replaces the water, air, etc. present in the pipe joint 2. The paint 10' has a constant pressure because the frictional force with the inner surface of the pipe of the intermediate gasket 5 is significantly greater than the decrease in pressure of the paint 10, and the paint is supplied to the paint machine 8 via the paint pipe a and the paint hose 9. Quantity of paint 10" is supplied.

Also, if it passes through the rear packing 6 or the pipe joint 2,
The paint 10, which has replaced non-paints such as water and air present in the pipe joint 2 by the displacement packing 4, naturally falls due to its own weight and accumulates at the bottom of the pipe, and the lip 7a, which is slightly larger than the inner diameter of the pipe, removes the paint 10. After that, the paint cup 8b is rotated by a motor powered by the battery 7b inside the interior case 7, and the centrifugal force generated thereby causes the paint pipe a and the paint hose to connect. A coating film 11 is formed by atomizing the coating material 10' which is sent in fixed quantities to the coating machine 8 via the coating device 9 and spraying it onto the inner surface of the tube.

Further, when the tow rope 3 is towed and reaches the tube end, the excess paint 10.10° is discharged from the tube end.

In this embodiment, three packings, one for replacement, one for middle, and one for rear, are used, but the intermediate packing may be omitted if the reduction in coating pressure due to hollows in the pipe joint is not a problem.

〔Effect of the invention〕

As explained in detail below, according to the inventions of claims (1) and (2), paint v4 can be directly supplied to the paint machine from inside the underground pipe, so paint supply pumps, paint hoses, etc. 4 is required, and it is economical because it does not require a large investment in equipment, and the construction can be easily carried out in narrow spaces because it requires less construction equipment.

In addition, the pressure of the paint between the replacement packing and the intermediate packing may be reduced by the hollows in the pipe joint, or the paint between the intermediate packing and the rear packing may have been filled in the hollows of the pipe fitting beforehand. The paint pressure hardly decreases and it is possible to supply a constant amount of paint to the paint sprayer.
A smooth coating film can be formed on the inner surface of the tube.

Furthermore, according to the invention of claim (3), after the paint that has replaced non-paints such as water and air existing in the pipe joint by the displacement packing passes through the rear packing, it naturally falls due to its own weight and reaches the lower part of the pipe. It is possible to remove the paint accumulated in the pipe from the pipe joint, and the inner surface of the pipe can be painted without narrowing the inner diameter of the pipe.

[Brief explanation of drawings]

Figures 1 to 7 show examples of the present invention, with Figure 1 being a schematic cross-sectional view of the underground pipe painting method, and Figures 2 (a) to 7.
(b) is a cross-sectional explanatory diagram showing the work process of underground pipe painting in order, Figure 3 (a) is a side view of the replacement packing, Figure 3 (b)
is a sectional view taken along the arrows ■■ in FIG. 3(a), FIG. 4(a) is a side view of the intermediate packing, FIG. 4(b) is a sectional view taken along the arrows N-rV in FIG. 4(a), Figure 5(a) is a side view of the rear packing, Figure 5(b) is a side view of the rear packing.
-V sectional view i, Fig. 6(a) is a side view of the battery case, Fig. 6(b) is a vr-vr sectional view of Fig. 6(a), and Fig. 7(a) is a side view of the battery case. Side view of the coating machine, Figure 7(b)
is a sectional view taken along the line ■-■ in FIG. 7(a). 1... Underground pipe line 2... Pipe joint part 3... Traction cable 3''... Connecting wire 4... Replacement packing 4a... Replacement groove 5... Intermediate packing 6... Rear packing 6a ... Paint pipe 7 ... Battery case 7a ... Lip 7b ... Battery 8 ... Painter 8a ... Paint pipe 8b ... Paint cup 8C ... Painter sled 8d ... Motor 9...Paint hose 10...Replacement paint 10°...Painting paint], 0"...Paint accumulated on the lower part 11...Paint film 12...Power cord

Claims (4)

[Claims] (1) Among multiple rows of underground pipes for wiring telecommunications cables etc. underground between manholes, pipes are installed on the inner surface of empty pipe bodies and pipe joints. A method of painting underground pipes in which paint is applied from the inside surface, in which a tow cable is slidably inserted through the replacement packing, and the replacement packing is inserted into the pipe by a length corresponding to the required amount of paint. Then, the tow cable is connected to the rear packing, the rear packing and the battery case are connected by a connecting wire, and the battery case and a paint machine having a painting cup are connected by a connecting wire. . Then, the towing cable is towed while rotating the coating cup. (2) Among multiple rows of underground conduits for wiring telecommunications cables etc. underground between manholes, pipes are installed on the inner surface of empty pipe bodies and at pipe joints. An underground pipe coating device that applies paint from the inner surface side, wherein the tow cable is inserted from one of the open ports at both ends of the pipe body to the other, and is wound up by a traction means on the other open port side.
a displacement packing whose outer periphery is in airtight contact with the inner surface of the pipe, is slidable relative to the tow cable, and replaces non-paint, such as water or air, present at the pipe joint with the paint while pressurizing the paint at the rear; A rear packing whose outer periphery is in airtight contact with the inner surface of the tube and is connected to the tow cable to push the paint from the front along the inside of the tube, a battery case that is the power source for the coating machine, and the inner surface of the tube are coated. The paint machine is connected, a pipe is passed through the rear packing, and the pipe and the paint machine are connected with a hose.The rear packing is pulled by a tow cable, and the rear packing supplies paint from the front to the paint machine. An apparatus for painting underground pipes, characterized in that it is configured to enable the painting of underground pipes. (3) An underground pipe coating apparatus according to claim (2), characterized in that a lip made of an elastic body and having an outer diameter larger than the inner diameter of the pipe is provided on the outer periphery of the rear packing and/or the battery case. . (4) An underground packing according to claim (2), characterized in that an intermediate packing is provided between the displacement packing and the rear packing, the outer periphery of which is in airtight contact with the inner surface of the pipe, and which is slidable relative to the tow cable. Pipe coating equipment.