JP5834546B2 - How to cut piping - Google Patents

Description

  The present invention relates to a pipe cutting method that can suppress the outflow of liquid during pipe cutting without using a special technique.

  When the pipes used for transporting various liquids are discarded after being used for a certain period, they are generally cut and disassembled into some parts and discarded. However, when the pipe is cut, there is a problem that the liquid filled in the pipe flows out to the outside. In particular, when the liquid in the pipe contains a contaminant, it is necessary to strictly control the outflow of the liquid.

  As a technique for cutting a pipe in which liquid is present, for example, in Patent Document 1, a pipe cutting method for cutting a pipe communicating with a radiation source, which penetrates from the cutting position of the pipe to the side on the radiation source side. A step of opening a hole and arranging a bag body having elasticity from the through-hole in the pipe; and inflating the bag body by injecting fluid into the bag body, and making the bag body liquid-tight over the entire circumference of the pipe A step of closing the pipe passage by contacting the pipe, a step of cutting the pipe at the cutting position, and a step of attaching a lid member to the cut opening and closing the through-hole. A pipe cutting method is disclosed.

  Further, in Patent Document 2, a branch pipe in which one end is connected to a branch base portion of a fluid pipe and a gate valve is connected to a connecting portion formed at the other end, while maintaining fluid transportation in the fluid pipe. A renewal method for a branch pipe of a fluid piping system to be renewed, in which 1) a step of closing a flow path in the branch pipe with a closing portion of a closing device inserted through a gate valve, and 2) leaving the closing portion in the branch pipe A step of removing the gate valve from the connecting portion of the branch pipe; and 3) the fluid pipe or the branch base is provided with a branch connection port communicating with the cut opening of the divided remaining branch pipe section, and the entire remaining branch pipe section A step of attaching a new branch member that can cover the outside of the new branch member in a close contact state, and 4) after the gate valve is connected to the connecting portion formed on the branch connection port side of the new branch member, the valve is in an open state. The closing part of the closing device is removed through the gate valve. Technology characterized by comprising the steps of: is disclosed.

  Furthermore, in Patent Document 3, a crushing means for crushing a closed portion where a pipe is closed by at least a pair of molds, and a joining means for joining the inner surface of the closed portion crushed by the crushing means so as to be in close contact with each other The crushing means includes a first mold for crushing the closed portion, and plastic deformation by crushing and deforming the closed portion crushed by the first mold in a reverse direction. The first mold comprises a male mold having an arcuate convex surface and a female mold having an arcuate concave surface, A second mold is composed of a mold having a flat surface and a mold that supports the closed portion in a substantially linear shape, and discloses a pipe closing device.

  Any of the techniques disclosed in Patent Documents 1 to 3 can achieve a certain effect in terms of suppressing the outflow of liquid at the time of pipe cutting.

JP 2010-32253 A JP 2009-24729 A JP 2007-160330 A

However, since the techniques of Patent Documents 1 to 3 all require a special device, there is a problem that the work for cutting the piping becomes complicated and the cost required for the cutting is large.
Moreover, with the technique of patent document 1, there existed a possibility that a bag body might burst and a liquid might flow out outside.
Furthermore, in the techniques of Patent Documents 2 and 3, since a large-scale device is required, there is a problem that it is difficult to perform work when the piping is deep in the ground.

  An object of the present invention is to make it possible to suppress the outflow of liquid at the time of pipe cutting without using a special technique for a method of cutting a pipe filled with liquid.

  As a result of intensive investigations to solve the above-mentioned problems, the present inventors have made a process of making a hole in the side portion of the pipe, and a nozzle in the hole. By inserting and injecting a chemical solution into the pipe through the nozzle, the step of hardening at least a part of the liquid and the step of cutting the pipe, the liquid in the cut portion of the pipe is provided. It can be used as a lid that hardens and prevents the liquid from flowing out, so it is possible to cut the pipe while suppressing the outflow of liquid when cutting the pipe. I found that there is no need.

The present invention has been made based on such findings, and the gist thereof is as follows.
(1) a step of making a hole in a side portion within a range of 0.1 to 1.0 m from the cutting position of the pipe;
Inserting a nozzle into the hole and injecting a chemical solution into the pipe through the nozzle to cure at least a part of the liquid and cutting the pipe at a portion where the liquid is cured A piping cutting method characterized by comprising:

(2) The pipe cutting method according to (1) above, wherein the chemical solution is No. 3 sodium silicate.

( 3 ) The diameter of the hole for inject | pouring the said chemical | medical solution is the range of 5-40 mm, The cutting method of piping as described in said (1) characterized by the above-mentioned.

( 4 ) The pipe cutting method according to (1), wherein the pipe is cut by gas fusing, cutting using a cutter, or cutting by a jigsaw.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the cutting method of piping which can suppress the outflow of the liquid at the time of piping cutting, without using a special technique.

It is a typical section of piping cut by the cutting method according to the present invention.

  The piping cutting method of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a cross section of a pipe to be cut in order to explain a pipe cutting method according to the present invention.

The pipe cutting method according to the present invention is a method of cutting a pipe 10 filled with a liquid 20 as shown in FIG.
In the present invention, the step of opening the hole 11 in the side portion of the pipe 10, the nozzle 30 is inserted into the hole 11, and the chemical solution 31 is injected into the pipe through the nozzle 30, so that the liquid 20 A step of curing at least a part of the pipe 10 and a step of cutting the pipe 10.

  By injecting the chemical solution 31 and curing the liquid 20, when the pipe 10 is cut at the cutting position 10X, the hardened liquid 21 serves as a lid at the cut portion 10X, so that the liquid from the pipe 10 20 outflows can be effectively suppressed. Further, the method according to the present invention can be cut simply by opening the hole 11 in the pipe 10 and injecting the chemical solution, so that it does not require special equipment and control as in the prior art, and can be obtained relatively easily. Can do.

Below, each process and conditions of the cutting method of piping by this invention are demonstrated.
(Drilling process)
The piping cutting method according to the present invention includes a step of forming a hole 11 in a side portion of the piping 10 as shown in FIG. This is because the nozzle 30 can be inserted into the pipe 10 in the next step.

  The method for making the hole 11 is not particularly limited. For example, the hole 11 can be made in the side portion of the pipe 10 using a drill or a horusoe. Among them, it is preferable to use a horusoe from the viewpoint that the size of the hole 11 can be adjusted precisely.

Further, the hole 11 for inserting the nozzle 30, (0.1m ≦ L1 ≦ 1.0m) to Ru provided from the cutting position 10X in the range of 0.1~1.0m of the pipe 10. If the distance L1 between the formation position of the hole 11 and the cutting position 10X is less than 0.1 m, it is too close to the cutting position, so that the hole 11 may be damaged during cutting, and accurate cutting may not be performed. This is because, when L1 exceeds 1.0 m, the injection position of the chemical liquid 31 and the cutting position 10X are too far apart, so that the liquid 20 at the cutting position 10X is not cured and may flow out to the outside when the pipe is cut. .

  The diameter Do of the hole for injecting the chemical liquid is preferably in the range of 5 to 40 mm. When the diameter Do is less than 5 mm, the hole 11 is too small, and therefore it may be difficult to insert the pipe 30. On the other hand, when the diameter Do exceeds 40 mm, the hole 11 becomes too large. This is because there is a possibility that the liquid 20 flows out when the 11 is formed.

(Chemical solution injection process)
As shown in FIG. 1, the pipe cutting method according to the present invention inserts a nozzle 30 into the hole 11 and injects a chemical solution 31 into the pipe through the nozzle 30, thereby at least one of the liquids 20. A step of curing the part.
By inject | pouring the said chemical | medical solution 31 and hardening the said liquid 20, as mentioned above, the hardened liquid 21 can be made into the cover at the time of piping cutting.

  Here, at least a part of the liquid 20 refers to a range including a portion 10X where the piping is cut. The range is not particularly limited, but it is preferable to cure to a portion separated from the hole 11 by 0.1 m or more so that the liquid 20 of the cut portion 10X is reliably cured. Moreover, all the liquid 20 in the piping 10 can also be hardened.

  The chemical solution 31 is not particularly limited as long as the liquid 20 can be cured, and can be appropriately selected depending on the type of liquid and the type of contaminating component contained. For example, it is preferable to use No. 3 sodium silicate (No. 3 sodium silicate) because the curing effect of the liquid 20 is large and there are few harmful points.

  Here, as a reason for limiting the chemical for curing the liquid 20 to the liquid chemical liquid 31 instead of the solid state, the liquid 20 can be uniformly mixed with the liquid 20, and the liquid 20 can be reliably cured. Because it can be done. When a solid chemical is used, it becomes difficult to uniformly mix with the liquid 20, and the liquid 20 of the cutting part 30X may not be cured.

The nozzle 30 for injecting the chemical liquid 31 refers to the tip portion of the means for injecting the chemical liquid 31. The shape of the nozzle 30 is not particularly limited, but is preferably cylindrical as shown in FIG. 1 from the viewpoint that it can be easily inserted into the formed hole 11. In this case, the outer diameter Dn of the nozzle 30 is preferably in the range of 4 to 40 mm. In relation to the hole 11 of the pipe 10, if the diameter is less than 4 mm, the diameter difference from the hole 11 becomes too large, so that the liquid 20 may flow out to the outside. This is because it becomes difficult to insert.
Furthermore, the means for injecting the chemical solution 31 is not particularly limited, and the chemical solution can be injected into the pipe 10 through the nozzle 30 by a device such as a pump or a manual operation.

  Moreover, it is preferable that the insertion depth B (refer FIG. 1) of the said nozzle 30 in the said piping inside is the range of 10-200 mm. When the depth B is less than 10 mm, the nozzle 30 is not sufficiently inserted. On the other hand, when the depth B exceeds 200 mm, the nozzle 30 is inserted too deeply. This is because 31 cannot be distributed in the liquid 20 and the liquid 20 may be sufficiently unevenly cured.

  The injection rate of the chemical solution 31 from the nozzle 30 can be selected as appropriate depending on the size of the pipe 20 and the type / concentration of the chemical solution 31. From the point that the liquid 20 can be cured efficiently. A speed of ˜30 L / min is preferred. If the injection rate is less than 10 L / min, the rate is not sufficient, so the liquid 20 cannot be cured efficiently, while if the injection rate exceeds 30 L / min, the rate is too high, This is because the liquid 20 may be unevenly cured.

(Pipe cutting process)
The piping cutting method according to the present invention includes a step of cutting the piping 10 as shown in FIG. Here, about the cutting | disconnection 10 of the said piping 10, the said chemical | medical solution 31 is inject | poured and the piping 10 part X in which the hardening liquid 21 exists is cut | disconnected.

  The cutting is not particularly limited, but is preferably performed by gas fusing, cutting using a cutter, or cutting with a jigsaw. This is because by using these means, the pipe 10 can be surely cut without scattering the liquids 20 and 21 inside the pipe 10 to the outside at the time of cutting.

(Other conditions)
The type of the liquid 20 filled in the pipe 10 is not particularly limited, but the effect of the present invention is most exerted in the case of the liquid 20 containing a radioactive substance or a contaminating component such as mud.

  Further, the liquid 20 may stop or flow inside the pipe 10. However, when the liquid 20 is flowing, the flow rate is preferably 10 L / min or less. If it exceeds 10 L / min, the flow rate is too large and it may be difficult to cure with the chemical solution 31.

  In FIG. 1, one of the pipes 10 is closed as indicated by 10A. However, if the liquid 10 is filled inside, the pipe 10 having both ends opened can be Cutting according to the invention can be performed.

  Further, the diameter Dc of the pipe 10 is not particularly limited, but is preferably 400 mm or less from the viewpoint that cutting according to the present invention can be effectively performed. This is because, when the diameter Dc exceeds 400 mm, the diameter is too large, and even when the liquid 20 is cured, the cured liquid 21 may spill out after cutting.

  What has been described above is merely an example of an embodiment of the present invention, and various modifications can be made in accordance with the content of the claims.

Examples of the present invention will be described below.
(Example)
The piping was cut in the following steps.
First, a pipe 10 (length: 300 mm) filled with a liquid 20 containing mud at a concentration of 10% by mass as a contamination component was prepared. Note that the filled liquid 20 is not flowing inside the pipe 10 and is in a stopped state.
As shown in FIG. 1, a hole 11 having a diameter Do20 mm was formed in a side portion of the pipe 10.
Thereafter, a cylindrical nozzle having an outer diameter of Dn 20 mm is inserted into the hole 11, and No. 3 water glass (chemical solution) is injected into the pipe 10 through the nozzle (injection speed: 10 L / in). min), and then allowed to stand for 10 minutes to harden a part of the liquid 20 into a gel.
Then, the pipe 10 was cut at a position 10X (distance L1 = 200 mm) separated from the hole 11 by 200 mm. Gas cutting was used for cutting.

(Evaluation)
As a result of cutting the pipes by the cutting method according to the example, it was found that there was no outflow of contaminated water filled in the pipes during the pipe cutting operation, and the pipes could be effectively suppressed.
Further, it has been found that the cutting operation can be performed relatively easily without making a special device or the like, after cutting a pipe and injecting a chemical solution.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the cutting method of piping which can suppress the outflow of the liquid at the time of piping cutting, without using a special technique. As a result, the piping can be cut more safely and at a low cost, which is extremely useful in the industry.

10 Piping 11 Hole 20 Liquid 30 Nozzle 31 Chemical

Claims (4)

A method of cutting a pipe filled with liquid,
A step of making a hole in a side portion within a range of 0.1 to 1.0 m from the cutting position of the pipe;
A step of curing at least a part of the liquid by inserting a nozzle into the hole and injecting a chemical solution into the pipe through the nozzle;
And a step of cutting the pipe of the portion where the liquid is hardened .   The pipe cutting method according to claim 1, wherein the chemical liquid is No. 3 sodium silicate.   The diameter of the hole for inject | pouring the said chemical | medical solution is the range of 5-40 mm, The cutting method of piping of Claim 1 characterized by the above-mentioned.   The pipe cutting method according to claim 1, wherein the pipe is cut by gas fusing, cutting using a cutter, or cutting by a jigsaw.

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