JPH03219197A - Emergency shutoff method for fluid conduit - Google Patents

Abstract

PURPOSE:To easily and quickly perform treatment for restraining a fluid leak by preliminarily housing a collapsed shutoff bag within a fluid conduit, inflating the bag with a pressurizing fluid upon the fracture of the fluid conduit and preventing a fluid leak at the fractured part of the conduit with the inflation of the bag. CONSTITUTION:A mounting seat 1 is fitted to a fluid conduit P and a hole is formed for fitting a bag insertion tool 3 to the seat 1. Two shutoff bags 4 in a collapsed state is preliminarily housed within the fluid conduit P. If the conduit P is fractured due to a civil engineering work, the bags 4 are inflated with a pressurizing fluid supplied from a pressurizing fluid supply means 9, and a fluid leak at the fractured part 10 of the conduit P is prevented with the inflated shutoff bags 4. Thereafter, the fractured part 10 is remedied with a repairing means. According to the aforesaid construction, a trouble due to a fluid leak can be properly prevented, and safety measures can be advantageously applied in terms of workability and work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for emergency shutoff of a fluid conduit for suppressing fluid leakage caused by damage to the fluid conduit during construction work in the vicinity of the fluid conduit.

[Conventional technology]

Conventionally, protective walls have been constructed to prevent fluid conduits from being damaged by construction, such as forming a protective wall between buried fluid conduits and civil engineering work areas using sheet piles driven underground. Ta.

[Problem to be solved by the invention]

However, there was a drawback that construction and removal of the protective wall required a lot of labor, time, and expense.

SUMMARY OF THE INVENTION An object of the present invention is to sufficiently suppress fluid leakage caused by construction work in the vicinity of a fluid conduit, and to enable countermeasures therefor to be carried out easily, quickly, and at low cost.

[Means to solve the problem]

A characteristic feature of the present invention is that before construction is carried out near the fluid conduit, a blocking bag is placed in a deflated state inside the fluid conduit or a pipe connected thereto, and the fluid conduit is closed during construction. When it is damaged, the blocking bag is expanded by pressurized fluid supply inside the fluid conduit, and the expanded blocking bag prevents leakage from the damaged part of the fluid conduit, and its effects are as follows. It is as follows.

[Function] Before construction work is carried out, a shrunken blocking hack is placed inside the fluid conduit or the pipe connected to it so as not to impede fluid transport. If the is damaged, inflate the isolation bag and
Leakage from damaged parts can be prevented in a short time, and the amount of leakage can be sufficiently and reliably suppressed to a small amount.

In addition, the work of inserting a blocking hack inside the fluid conduit or the pipe connected thereto, and the work of removing the blocking bank, can be performed using a known non-splash type bag insertion tool, etc., compared to the construction of the protective wall of the prior art described above. It can be carried out with significant savings in labor, time and expense.

〔Effect of the invention〕

As a result, even if the fluid conduit is damaged due to construction work in the vicinity, major troubles due to fluid leakage can be reliably prevented, and safety measures can be taken advantageously in terms of work efficiency, work efficiency, and cost. We were able to establish an emergency method for shutting off the conduit.

〔Example〕

Next, examples will be shown.

Before carrying out civil engineering work near buried conduits, the following (
Set the blocking bag against the fluid conduit according to the steps in a) or 2).

(a) As shown in Figure 1 (a), the fluid conduit (P) is excavated on the upstream side of the civil engineering work area, and the shutter (1a
) attached to the fluid conduit (P), attach the perforator (2) to the mount (1), open the shutter (1a) and open the trill (2a) of the perforator (2). ) to form a hole in the fluid conduit (P).

(b) After pulling out the trill (2a) of the drilling machine (2), close the shutter (1a) and attach the drilling machine (2) to the mounting base (1).
Remove from.

(c) As shown in Figure 1 (b), the bag inserter (3)
Attach it to the mounting base (1) and attach the two shutoff notches (4).
into the fluid conduit (P) in a contracted state, and use the magnet (5) attached to the blocking hack' (4) to close the fluid conduit (P).
).

The hose (6) connected to the cut-off hack (4) is passed through the hack insert (3) in an airtight manner, and the quick fitting (7)
) is attached to the end of the hose (6).

(d) As shown in Figure 1 (c), the excavated area is backfilled, a case (8) with a lid (8a) is buried, the road is restored, and the quick joint (7) is installed in the case (8). ),
When necessary, the lid (8a) is opened so that the pressurized fluid supply means can be immediately connected to the quick coupling (7).

After making the above preparations, civil engineering work will be carried out near the fluid conduit (P), and if the fluid conduit (P) is damaged due to the civil engineering work, the following measures will be taken to prevent leakage.

As shown in Figure 1 (d), open the lid (8a), connect the pressurized fluid supply means (9) to the quick coupling (7), and insert the shutoff hack (4) inside the fluid conduit (P). The inflated blocking bag (4) prevents leakage from the damaged portion (10) of the fluid conduit (P).

After that, the damaged part (10) is repaired by known repair means,
Pressurized fluid evacuation deflates the isolation bag (4) and resumes fluid transport.

When the civil engineering work is completed, the mounting base (1) is dug out, the blocking bag (4) is pulled back into the bag inserter (3), the shutter (1a) is closed, and the bag inserter (3) is removed. Remove from the mounting base (1).

Next, as shown in Fig. 1 (E), plug installation machine (11
) on the mounting base (1), open the shutter (1a) and close the hole of the fluid conduit (P) with the plug (2).

Thereafter, the mounting base (1) and the plug attachment machine (11) are recovered, and the fluid conduit (P) is backfilled.

[Another example]

Next, another embodiment will be described.

As shown in Figure 2, the deflated shutoff gag (4) may be placed inside the hack insert (3) or otherwise placed inside the tube connected to the fluid conduit (P). The shutoff bank (4) may be inflated after being placed inside the fluid conduit (P) when the fluid conduit (P) breaks.

The means for inserting the cutoff hack (4) into the inside of the fluid conduit (P) or the inside of the pipe connected to the fluid conduit (P) is appropriately selected from known non-flow type and flow cut-off type construction methods. can.

Only one blocking bag (4) may be used, or it may also be installed downstream of the construction area.

The fluid conduit (P) may be for city gas, water, or any other type, and may be installed above ground.

Any type of construction work may be performed in the vicinity of the fluid conduit (P).

The pressurized fluid supply means (9) may be connected to the cut-off hack (4) before the construction starts, and the type of pressurized fluid may be air, water, or any other type. Means (9) can be appropriately selected depending on the pressurized fluid, such as a cylinder or a pump.In addition, in order to facilitate comparison with the drawings, the means (9) may be appropriately selected according to the pressurized fluid. is not limited to the structure of the attached drawings.

[Brief explanation of drawings]

FIGS. 1(A) to 1(E) are explanatory diagrams of the construction procedure of an embodiment of the present invention. FIG. 2 is a conceptual diagram showing another embodiment of the present invention. (4)...Bag for blocking, (P)...
Fluid conduit.

Claims (1)

[Claims] Before carrying out construction work near the fluid conduit (P), a blocking bag (4) is placed in a contracted state inside the fluid conduit (P) or a pipe connected thereto, When the fluid conduit (P) is damaged due to construction work, the blocking bag (4) is expanded by pressurized fluid supply inside the fluid conduit (P), and the inflated blocking bag (4) is
) A method for urgently shutting off a fluid conduit (P) to prevent leakage from a damaged part of the fluid conduit (P).