JPS5938026B2 - Equipment for coating inner surface of piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly aimed at gas pipes, and is intended to repair the inside of the pipes in order to repair leakage caused by cracks in the piping or to prevent leakage when a risk of leakage is expected. Inject and fill the foamed liquid sealant into the tube, allow the sealant to fully adhere to the inner surface of the pipe for a certain period of time, then drain the excess sealant outside the pipe, and then seal the inner surface of the pipe with sealant. Methods for coating (e.g. Japanese Patent Application Laid-Open No. 54-453)
49)).

When implementing this method, basically the following work steps are required: (to) Foaming the liquid sealant in the foam sealant generator with compressed air from the blower; The process of injecting and filling this foam sealant into the pipe to be treated, and (1 I) the process of discharging the excess sealant from the pipe with compressed air from the blower after a certain period of time are essential. be.

According to the treatment method that includes the basic steps described above, compared to the conventional pipe replacement method, it is possible to significantly improve construction efficiency, especially when dealing with buried pipes, and to improve construction efficiency such as road excavation, etc. It is possible to minimize the harmful effects on the surrounding living environment caused by the sealant, and compared to the injection filling method of liquid sealant, injection and discharge can be performed easily and quickly, which is advantageous in terms of efficiency. This method has the advantage of being able to reliably form a film over the entire circumference of the pipe, allowing effective treatment in terms of quality.

However, when implementing such a construction method, conventionally, the equipment for implementing the step (a) and the equipment for implementing the step (b) are separate machines, respectively. A device consisting of a foam sealant generator, a dedicated blower, and a dedicated hose for connecting the piping to be treated; and a device comprising a blower for discharging excess sealant and a hose dedicated to connecting the piping to be treated. Two devices were used.

The reason for this is that a considerably large air flow rate (flow rate) is required to discharge excess sealant from the piping to be treated, whereas a considerably large air flow rate (flow rate) is required to foam the sealant. This is because a single pneumatic blower cannot be shared for both of the above processes, as there is a restriction that it must be quite small. Therefore, in the conventional method, it is necessary to prepare two blowers and connection hoses even though they are the same type of equipment, which is wasteful in terms of equipment costs and transportation costs. However, there was a drawback that it required a lot of time and effort to connect the system, and there was still room for significant improvement in terms of reducing costs and improving construction efficiency. The present invention has been made in view of the above-mentioned circumstances, and is aimed at implementing a method for coating the inner surface of pipes with a foam sealant, which basically has excellent effects in terms of efficiency and quality. Transport, installation, storage, inspection, repair, etc. can be carried out simply and easily, and the above-mentioned process changeover can also be carried out quickly and appropriately, so that overall costs can be reduced and construction efficiency can be significantly improved. Have a purpose in mind.

Hereinafter, embodiments of the present invention will first be described based on the drawings.

FIG. 1 schematically shows the configuration of the apparatus according to the present invention, which includes a blower 8 housed in a casing C equipped with a hose 5 for connection to one pipe M to be treated, and a foam sealant generator 1. , a pressure regulating valve 10 for measuring resistance inside the pipe, a pressure regulating valve 11 for testing the airtightness inside the pipe, a leak checker 12, etc., and an air supply pipe group A,, A2 connecting these with the route shown in the figure, and the air pipe group A2 as shown in the figure. The main components include an interposed switching valve V (a combination of valves V, to V6, and a three-way valve 14, which will be described later).

The foam sealant generator 1 consists of a storage tank 1a for liquid sealant S and a foam tube 1b installed at the bottom of the tank 1a,
The bubble generating pipe 1b is connected to the first main air pipe 2a via an outgoing branch air pipe 2b.

A valve V1 and a flow rate restrictor regulator 3 are interposed in this forward branch air supply pipe 2b, and a nozzle 4 for adjusting the flow rate (for releasing excess flow) is connected thereto. The upper part of the storage tank 1a is connected to the first main air pipe 2a via a branch air pipe 2c. Then, the foam sealant generator 1 and the air pipe group A corresponding thereto (consisting of a first main air pipe 2a, two reciprocating branch air pipes 2b, 2c, and a T-shaped third main air pipe 2d to be described later) are installed. , stored in the upper box-shaped casing C1.
It constitutes unit U1. Reference numeral B designates a box portion from which a connection hose 5 for the pipe to be treated is led out, which has a T-shaped third main air pipe 2d and is separably connected to the first unit U.

V2 and V3 are valves installed in the T-shaped third main air pipe 2d, and P is a pressure gauge connected to the pipe. Three 6・
... are interposed between each end of the T-shaped third main air pipe 2d and the hose 5, the first main air pipe 2a, and the branching air pipe 2c from the upper part of the storage tank 1a. It is a one-touch joint. 7 is a pressure relief valve provided to the upper part of the storage tank 1a.

On the other hand, a regulating valve 10 for measuring pipe resistance is connected in parallel to a second main air pipe 9a led out from the blower 8 via an outgoing branch air pipe 9b, and a regulating valve 10 for measuring in-pipe airtightness is connected to this outgoing branch air pipe 9b. Pressure valve 11 and leak checker 12 in series with it
are connected to each other via a return/branch air pipe 9c.

There are valves V at the inlet and outlet of the former outgoing branch air supply pipe 9b, respectively.
4 and V5 are interposed, and a nozzle 13 for adjusting the flow rate (for releasing excess flow) is connected to the inlet side, and a pressure gauge P2 is connected to the outlet side. Thirty-thousand valves 14, 14 are interposed at the connection portions between the former branch air pipe 9b and the latter return branch air pipe 9c, respectively. A valve V6 is interposed in the second main air pipe 9a between the inlet and the outlet of the outgoing branch air pipe 9b, and a pressure gauge P is connected upstream from the inlet. The blower 8, pressure regulating valves 10, 11, leak checker 12, and the air pipe group A2 for these (consisting of a second main air pipe 9a and two reciprocating branch pipes 9b, 9c) are housed in the lower box-shaped casing C2. The second unit U2 is housed in the second unit U2. Thus, the box-like casing C of the first unit U and the box-like casing C2 of the second unit U2 are substantially connected to each other by a connector 16 such as a metal fitting. They are constructed so that they can be fixedly connected to form a single unit by removing the box-like casing C, and this fixed connection allows the first main air pipe 2a and the second main air pipe 9a to be connected via the one-touch joint 15. It is configured so that the communication connection is made automatically.

17 in the figure is connected to the blower 8, and the lower casing C
2, an electrical cord attached to the cord so that it can be freely fed out and retracted;
18 is a main switch for the electric circuit, and 19 is an ammeter. Moving wheels 20, such as casters, are attached to the lower casing C. The apparatus configured as described above is used by being connected to the pipe M to be treated which has a leak as shown in FIG. 2 via the hose 5 described above.

Reference numeral 22 denotes a hose connected to the pot 21 of the pipe M, and its outlet end faces the discharged sealant recovery container 23.

This container 23 is not used in the case of the rear ridges i) and (ii1). Next, the operating procedure of the apparatus will be explained based on FIGS. 3 to 6 in the case of leakage repair.

The route indicated by the bold line indicates the flow route of the compressed air from the blower 8. (1) Measuring pipe resistance (Fig. 3) By appropriately operating valves V, ~V6, and 30,000 valves 14, 14, the compressed air from blower 8 is transferred to regulating valve 10 for measuring pipe resistance.
After reducing the pressure (150 mmAq (water column)) through the pipe, it is sent to pipe M.

In this case, as shown in FIG.
The gas appliance alternative nozzle 25 is connected via the. The resistance inside the pipe is measured based on the pressure drop at the pressure gauge 26. Also, the degree of leakage can be determined from this. (ii) Foaming and injection filling of liquid sealant S (Fig. 4) Valves V, ~V
,, By appropriately operating the three-way valves 14, 14, the compressed air by the blower 8 is reduced in pressure by the flow rate restriction adjustment 3, and then fed into the bubble generating pipe 1b, and the liquid sealant S is produced in the storage tank 1a. The foaming process progresses, and the foamy sealant S5 adheres to the entire inner circumferential surface of the pipe M as shown in FIG.

This injection and filling stops when a certain amount of foamy sealant Sl has come out into the container 23. (lli) Discharge of excess sealant (Figure 5). By appropriately operating the valves (1) to (6) and the three-way valves 14, 14, the compressed air by the blower 8 is sent directly into the pipe M, and the excess sealant is discharged to the outside of the pipe M. The discharged material is collected into a container 23. After this discharge, the thin film of sealant adhering to the inner surface of the pipe M is dried by leaving it for a certain period of time (see FIG. 9). This drying may be done naturally, but it can also be done actively by continuing to operate the blower 8 to feed air. When drying has progressed to a certain extent, return to the state shown in (;) (Figure 3).
Measure the pipe resistance again.

Compare the measurement results in (i) to determine whether the measurement results are within a range that will not cause any problems during actual use after construction. If it exceeds the allowable range, check (111) (Figure 5) to see if the Drain the sealant. (lv) Pipe airtightness test (Figure 6) If the measurement result in (iii) is within the allowable range, appropriately operate valves V, ~V6, and three-way valves 14, 14 to supply pressurized air by blower 8 into the pipe. It is fed into the pipe M through the airtight test pressure regulating valve 11 and the leak checker 12.

The pressure regulating valve 11 reduces the pressure of the pressurized air (300mlAp).
In this airtight test, Kotoku 21 was closed. If there is no pressure drop at the leak checker 12, it means that the leak in the pipe M has been reliably repaired. Zhou, the airtightness test is
In some cases, a gauge pipe is connected to the end part 21 of the pipe M. In such a case, the pressure regulating valve 11 is used as a device.
, the leak checker 12 may be omitted. However, there is no change in the fact that the valve V6 is opened for measurement and air for inspection is pumped. The apparatus of the present invention can also be applied to comparative inspection of piping routes as shown in FIG. 10 A and B.

In other words, each Kotoku 21... has an alternative nozzle 25.
. . . and pressure gauges 26 . In order to simplify the valve switching operation and the structure, a pair of valves V2 and V
3, or ■, and V6, or V, and ■6 may be replaced with three-way valves, respectively.

In particular, if there is a difference in the opening/closing timing of V2 and V, there is a risk that the sealant from the foam sealant generator 1 will flow into the blower 8 side through the valve 2. Therefore, if these (2) and (V3) are replaced with three-way valves, there will be no timing deviation, and this inflow can be reliably prevented and safe use can be achieved. Even if a three-way valve is not used, the possibility of inflow can be reduced by interposing valve (2) in the horizontal path.
As in the above embodiment, the entire unit is connected to the first unit U.
, and the second unit U2, which can be stacked up and down and fixed and separated, it will be easier to transport in narrow passages and install on narrow floors, and it will be easier to inspect and repair the inside. Although it is convenient, it is not necessary to configure it in such a divided unit type.

In summary, the piping inner surface coating treatment apparatus according to the present invention has the following features:
A blower and a foam sealant generator that foams the liquid sealant by introducing air into a storage tank of the liquid sealant are installed in a casing equipped with a connection hose for one pipe to be treated. the blower and the connecting hose are connected by a main air pipe, and the air pumped from the blower is sent into the pipe to be treated through the connecting hose; The liquid sealant is generated by connecting the intermediate portion and the foam sealant generator through an outgoing and branching air pipe equipped with a flow restrictor, thereby reducing the flow rate and pressure of the air that is forced to be fed from the blower. The foam sealant generator is configured to be introduced into the vessel, and the foam sealant generator and the middle of the main air pipe are connected by a return branch bubble pipe on the downstream side (IC.) of the outgoing branch air pipe. , configured to send the foam sealant generated in the foam sealant generator into the treated piping via the connection hose, and to supply pressurized air from the blower to the foam sealant. A state in which the foam sealing agent generated by the agent generator is fed into the pipe to be treated via the connection hose, and pressurized air from the blower is fed into the treatment pipe. A valve is inserted into the main air pipe and the outgoing branch air pipe for switching to a state in which the air is directly fed into the pipe M to be treated via the main air pipe and the connection hose. shall be.

In the above configuration, two types of air flow paths are provided between one hose for connecting the pipe to be treated and one blower, and a valve that selectively switches between these flow paths is provided, as well as a valve for selectively switching between these flow paths. By adopting a configuration that rationally incorporates a flow rate regulator, it is possible to eliminate at least two processes that require different amounts of air and air pressure (the sealant foam filling process and the excess sealant discharge process). Since it is now possible to carry out operations using only one compact device, it is much easier to install the entire device on-site than in the past, when each device was configured separately and assembled and connected to each other on-site. Not only can transportation, installation, storage, inspection, repair, etc. to be carried out easily and easily all at once, but there is also no need to replace equipment or reconnect groups of air pipes when switching processes as mentioned above. Not only can unnecessary labor and time be saved, but also malfunctions such as incorrect connections can be avoided, and overall work efficiency can be greatly improved.
As a result, it has had the great effect of reducing repair costs and shortening the amount of time customers will be unable to use the product.

[Brief explanation of drawings]

The drawings illustrate embodiments of the apparatus for coating the inner surface of pipes according to the present invention, in which Fig. 1 is a schematic configuration diagram, Fig. 2 is a piping system diagram during construction, and Figs. 3 to 6 show the operation of the apparatus. Diagram for explaining the state, Figure 7 is a piping system diagram for measuring the internal resistance of the pipe, Figure 8 is a diagram for explaining the feeding state of foam sealant, Figure 9 is a diagram for explaining the drying state after excess sealant is discharged, and Figure 10 A and B are piping system diagrams showing examples of applied use. 1...Connection hose, 1a...Storage tank, 3...Flow rate restrictor regulator, 5...Connection hose, 8...・Blower, 2a, 9a, 2d
...Main air pipe, 2b...Outgoing branch air pipe, 2c...Return branch air pipe, V1, ■2...
...Valve, M...Piping to be treated.

Claims (1)

[Claims] 1 Into a casing C equipped with a hose 5 for connection to one pipe M to be treated, one blower 8 is used to foam the liquid sealant by introducing air into the storage tank 1a of the liquid sealant. The blower 8 and the connecting hose 5 are connected to the main air pipes 2a and 9.
a, 2d, and is configured to send the air under pressure from the blower 8 into the treated pipe M through the connection hose 5, and the main air pipes 2a, 9a, 2d are and the foam sealant generator 1, and the flow rate restrictor regulator 3.
are connected by an outgoing branch air supply pipe 2b interposed therein, so that the air flow rate and pressure fed from the blower 8 is reduced and the air is sent into the foam sealant generator 1, and the outgoing branch On the downstream side of the air pipe 2b, the foam sealant generator 1 and the middle of the air pipes 2a, 9a, and 2d are connected by a branch air pipe 2c, so that the foam sealant generator 1 generates configured to feed the foamed sealant into the treated piping M via the connection hose 5,
In addition, the compressed air from the blower 8 is fed into the foam sealant generator 1, and the foam sealant generated in the generator 1 is passed through the connection hose 5 to the processing pipe M. In order to switch between a state in which the compressed air from the blower 8 is sent into the pipe M and a state in which the compressed air from the blower 8 is directly sent into the pipe M to be treated via the main air pipes 2a, 9a, 2d and the connecting hose 5. A piping inner surface coating treatment apparatus characterized in that valves V_1 and V_2 are inserted into the main air pipes 2a, 9a, 2d and the outgoing branch pipe 2b.