JPS61276006A - Air flow control device for pipe reclamating work - Google Patents

Abstract

PURPOSE:To execute the air flow control without depending on the perception of the operator, automatically and suitably and to hold the pipe reclamating work at the high level by setting the sequencer beforehand in accordance with the characteristic of the provided pipe. CONSTITUTION:When the electric power source is turned on, an in-pipe remaining water removing mode is set, a manual driving unit 16 is operated, thereby, electromagnetic valves 111-11n are successively opened, and after that, when the valve is closed, the process of the corrosion rate inspection advances. Here, the valves 111-11n are successively opened and the pressure drop of respective provided pipes is recorded. In the same way, the rust in the provided pipe is dried. Next, the same process is repeated, and at the downstream side of pipe joints 121-12n, the sand is supplied and ground. In the leaking test, the prescribed quantity of the pressure in the provided pipe is pressured by a pressure adjusting valve 4, an opening closing valve 3 is tightened, and kept as it is for the prescribed time, and the indicated value of respective pressure gages is confirmed. Next, at the downstream side of the valves 111-11n, the cleaned water is supplied, cleaning is executed and in the same process, the drying process advances. At the lining process, in accordance with the prescribed lining coated film thickness, a suitable air flow is supplied to respective provided pipes based upon the size and the length of the provided pipe and lining is equally executed to the internal surface of these provided pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for controlling the flow rate of air used in pipe rehabilitation work.

<Prior Art> Pipe rehabilitation work has heretofore been carried out by removing rust formed on the inner wall of an existing pipe and, if necessary, lining the inner wall of the pipe. Such pipe rehabilitation work consists of a number of steps, as shown in Figure 1.

In other words, a part of the existing pipeline is removed, and piping for pipe rehabilitation work is connected to its upstream and downstream ends (ST1).
Next, an air flow is introduced into the existing pipe to remove residual water in the existing pipe (ST2>), and the state of rust inside the existing pipe is evaluated based on the pressure drop in the existing pipe (5T3), and then high-speed air flow is continuously introduced into the existing pipe. By supplying the flow, the rust inside the pipe is dried (ST4), and the rust is made brittle so that polishing in the next polishing step can be performed well.

Next, the abrasive material such as sand is transported inside the existing pipe using a high-speed air flow (5T5), rust is removed inside the pipe, and the polishing status is evaluated by measuring the pressure drop inside the existing pipe (5T5). Sr1). Furthermore, a leakage test of the existing pipe is conducted by pressurizing the inside of the existing pipe to a predetermined pressure and measuring the state of pressure attenuation (Sr7).

Next, water is introduced into the pipe to clean the inside of the pipe (Sr8)
. Air flow is again introduced into the existing pipe to remove the water used for cleaning (Sr9). Furthermore, if necessary, line the inner wall surface of the tube using epoxy resin or the like (ST1
0). When applying the lining, a high-velocity air stream is used to ensure that a homogeneous lining is applied to the inner wall surface of the tube, and then the lining film is dried by the same air stream.

After the completion of the lining process, a leakage test (ST11) is carried out again, the pipe rehabilitation equipment is removed from the existing pipe, and the existing pipe is restored to its original state (5T12). Inspect whether it has been properly restored (ST
13).

<Problems to be solved by the invention> As described above, pipe rehabilitation work consists of many steps, and in many of the steps it is necessary to introduce high-speed airflow into the pipe, and each step requires the introduction of high-speed airflow into the pipe. the air pressure to be supplied to,
That is, the air flow rate is different, and conventionally, a pressure gauge was installed at the upstream end of the existing pipe to manually adjust the air flow rate to be supplied into the pipe.

- However, the important parameter in such pipe rehabilitation work is the air flow rate, and the pressure gauge installed at the upstream end of the existing pipe is not necessarily a measure of the flow rate of the air flow introduced into the existing pipe. I don't get it. This is because the relationship between the reading on the pressure gauge and the actual flow rate in the existing pipe is affected not only by the inner diameter of the existing pipe and its length, but also by the bending condition along the way and the characteristics of the various pipe fittings used. This is because they are strongly affected by

Therefore, conventionally, the air pressure introduced into the existing pipeline has been set by relying on the operator's intuition, but it has not always been possible to achieve high-quality construction results.

Means for Solving the Problems> In view of the shortcomings of the prior art, the main object of the present invention is to provide a pipe repair work that can automatically and appropriately perform pipe rehabilitation work without relying on the operator's intuition. An object of the present invention is to provide an air flow rate control device for renovation work.

<Function> In this way, airflow can be introduced into existing pipes at the optimal flow rate for each step of pipe rehabilitation work, making it possible to consistently achieve a high level of construction quality without relying on the operator's intuition. It becomes possible.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an explanatory diagram schematically showing the configuration of an air flow rate control device based on the present invention. A main pipe line 2 is connected to the air pressure source 1, which may be composed of a pump and an air tank, and the main pipe line 2 is provided with an on-off valve 3, a control valve 4, and a pitot pipe 8 in this order from the upstream side. The downstream end of the main pipe 2 forms a manifold that branches into n branch pipes, and each of the branch pipes 101 to 10n is equipped with a solenoid valve 111 to 11° and a pipe joint 121 to 12° to be connected to the existing pipe. is provided.

The pressure regulating valve 4 is of a so-called pilot type, and the pilot pressure supplied from the pyrobe 1 to the pressure line 7 is reduced by the pressure reducing valve 6, and the pressure regulating valve 4 is reduced by the actuator 5.
This is done by controlling the Further, the pitot tube 8 is provided with a differential pressure gauge 9 for measuring the differential pressure as a measure of the flow rate in the main conduit 2, and is capable of generating an electrical signal corresponding to the flow rate in the main conduit 2. . Solenoid valve 111
-11n are for selectively connecting each of the plurality of existing pipes to the flow rate control device.

A control device 13 for controlling the airflow control device includes a control panel 15 equipped with a power switch and other manual modes, or manual switches used to set various parameters, and a control panel 15 that determines each operating mode of the flow rate control device. A sequencer 14 and a controller 17 for flow rate control are built-in. Also connected is a manual operation unit 16 that is used by an operator working at the downstream end of an existing pipeline to change the existing pipeline to be processed or to instruct the start point of a new work mode. . Controller 13
and the manual operation unit 16 are connected to each other by telephone, allowing a meeting between the operator on the controller side and the operator on the manual operation unit side. However, in general, it is not necessary for an operator to constantly monitor the controller 13.

The sequencer 14 is connected to the on-off valve 3, the controller 17, and the manual operation unit 16, and functions to sequentially realize predetermined operation modes set in advance. The controller 17 receives the output of the differential pressure system 9 as a control input, and supplies an actuation signal as a control output to the actuator of the control valve 4 as a control output. Further, the target value determined by the sequencer 14 is supplied to the controller 17 for each operation mode.

Next, the operating procedure of the flow rate control device according to the present invention will be explained based on the flowchart shown in FIG. The flow rate control device based on the present invention is intended to automate the process from removing residual water in the pipe (Sr2> to the lining process (ST10) in Fig. 1, and these processes will mainly be explained in 31. .

First, when power is applied to the flow rate control device shown in FIG. are selectively opened sequentially, and when the last solenoid valve is opened and closed, the next corrosion degree inspection (S
Proceed to step r3). In the process of the next corrosion degree inspection (Sr3), similarly to Sr2, the solenoid valves 111 to 11o are sequentially opened and the pressure drop in each existing pipe is automatically recorded.

This recorded result can be used to set the polishing time in the subsequent polishing step (Sr5). Incidentally, in the above two steps, the pressure regulating valve 4 is in a fully open state. In the tube endoscope drying step (Sr4), rust inside the existing pipe is dried in the same manner as in the above two steps.

In the next polishing step (Sr5), the same steps as those described above are repeated, but a required amount of sand as an abrasive is supplied downstream of the pipe joints 121-12°.

In the leakage test (Sr7), the pressure inside the existing pipes is increased to 7JG to 3Kg/cm using the pressure regulating valve 4, and then the on-off valve 3 is closed and left as it is for a predetermined period of time until the pressure gauge installed in each existing pipe indicates the pressure. Monitor changes in values and confirm that there are no leaks from existing pipes.

In the next cleaning process (Sr1), there is no need to supply pressurized air, and a separate pipe line (not shown) is provided for each solenoid valve 1.
Cleaning water is supplied on the downstream side of 11 to 11o. Next, in the drying step (Sr9), the same steps as Sr2 to Sr4 are performed to completely remove the washing water, and then the process proceeds to the lining step (ST10). In particular, in the lining process, the thickness of the lining coating depends on the amount of air flow supplied, so the thickness of the lining coating depends on the size and length of the existing pipe. Based on this, an appropriate air flow rate is supplied to each existing pipe, and the inner walls of these existing pipes are uniformly lined.

As described above, according to the present invention, by setting the sequencer in advance according to the characteristics of the existing pipe, pipe rehabilitation work can be performed according to a predetermined sequence without relying on the operator's intuition.

<Effects of the Invention> As described above, according to the present invention, the burden on operators during pipe rehabilitation work is reduced, and all processes can be automatically processed, significantly reducing the time required for pipe rehabilitation work. Can be shortened. Moreover, since the flow rate of the supplied air can be set to an appropriate value for each existing pipe, the quality of pipe rehabilitation work can always be maintained at a high level, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram showing the process of pipe rehabilitation work to which the air flow rate control device based on the present invention can be applied. FIG. 2 is a diagram showing the functional configuration of the air flow control device for pipe rehabilitation work based on the present invention. 1... Air pressure source 2... Main pipe line 3... Open/close valve 4... Pressure adjustment valve 5... Actuator 6... Pressure reducing valve 7... Pilot pressure pipe line 8...
Pitot tube 9... Differential pressure gauge 10... Branch pipe line 11... Solenoid valve 12... Pipe joint 13...
Control device 14...Sequencer 15...Control panel 16...Manual operation unit 17...Controller Patent applicant Pipe Refresh Co., Ltd. Agent
Person Patent Attorney Yo Oshima - Figure 1

Claims (1)

[Scope of Claims] An air flow control device for pipe rehabilitation work, comprising: an air pressure source; a main pipe connected to the downstream side of the air pressure source; and a pipe installed at the downstream end of the main pipe to be repaired. a pipe joint to be connected to the main pipe; a flow control valve provided in the middle of the main pipe; a flow rate measuring means provided in the main pipe downstream of the flow control valve; and pipe rehabilitation work. a sequencer that sequentially determines operating modes corresponding to processes; and a target flow rate in the main pipe for each operating mode set by the sequencer by operating the flow rate control valve based on an output signal of the flow rate measuring means. An air flow damping device comprising: a controller adapted to control the air flow rate;