JPH0751994B2 - Blow method in live tube branch method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blow method used for collecting chips in a live tube branching method, and in particular, it directly pressurizes a fluid to be blown (blow fluid). This is related to the blow method of returning to the main pipe again.

[Prior Art] As a live tube branching method for branching the main tube for supplying water, gas, etc., a method of performing a live tube branching method by depressurizing the inside of the main tube and a live tube branching method without depressurizing the inside of the main tube There is a method of performing construction (hot tap method).

The method of performing live pipe branching work by decompressing the inside of the main pipe is excellent in safety because it is decompressed, but it takes time and labor for decompression work, and it is not possible to speed up the construction and the main pipe is gas. Since gas replacement work is required when using pipes, it takes much more time and labor, and there is a problem that even during live pipe branching work, it annoys customers during decompression work.

Therefore, in recent years, many methods have been adopted in which live pipe branching work is performed without depressurizing the inside of the main pipe in consideration of annoyance to consumers.

About the live tube branching method by this hot tap method 2
It will be described with reference to the drawings.

For example, when the branch pipe 101 is taken out from the main pipe 100 of the gas pipe, the pressure in the main pipe 100 does not drop and the main pipe 1
To branch the live pipe without stopping the gas flow of 00, first weld the branch short pipe 102 to the main pipe 100, and then add the gate valve to this.
Install 103.

Next, as shown in FIG. 2A, the punch 104 is set on the gate valve 103. The punching machine 104 has a shaft 105, and a cylindrical cutter 106 having a drill 107 is attached to the tip of the shaft 105. The shaft 105 is rotated by an external drive source (not shown) such as an air motor. And is configured to rotate the cutter 106 and the drill 107. Then, when the cutter 106 and the drill 107 are rotated to feed toward the main pipe 100, FIG.
After the drill 107 pierces the main pipe 100 as shown in FIG. 3, the cutter 106 also pierces the main pipe 100. During this drilling work, the gas that is the fluid in the main pipe 100 is divided into the branch short pipe 102 and the gate valve 1.
03 and punching machine 104. However, since the perforator 104 is hermetically closed, the gas flowing into the perforator 104 does not leak outside.

Once the main 100 has been drilled, the cutter 106 and drill 10
Stop rotation of 7 and punch cutter 106 and drill 107 1
It is pulled in 04 and paid. Then gate valve 103
The disk 103a is closed and the punch 104 is removed from the gate valve 103 (FIG. 2 (c)).

After that, when the branch pipe 101 is connected and the gate valve 103 is opened, the gas flows through the branch pipe 101, and the live pipe branching work is completed as shown in FIG.

By the way, the main pipe 100 and the drill 107 and the cutter as described above.
Chips are generated when drilling at 106, but the chips are the main 1
Instead of flowing into 00, the blow valve 108 provided in the branch short pipe 102 for recovery to the outside is opened to open the branch short pipe 102 from the main pipe 100.
Chips are put on the fluid that flows into and collected.

This chip collecting method will be described with reference to FIG.
9, one end of a blow pipe 111 having a flow control valve 110 is connected to the branch short pipe 102 via the blow valve 108, and the other end of the blow pipe 111 is a plurality of containers (for example, drums) 112, 112.
It is configured to be connected to a through valves 113 and 113a, respectively, and the branch pipe 10 is branched from the main pipe 100 through the blow pipe 111.
The blow fluid mixed with the chips is collected by the procedure of putting the blow fluid flowing into 2 into one container 112, and when it is filled into the next empty container 112a. Then, the container filled with the blow fluid was transported to another place, the chips and the fluid were separated in a later step, and the separated fluid was reused.

[Problems to be Solved by the Invention] However, there are the following problems in the recovery of chips by the conventional blow method as described above.

Since the blow fluid is put in the container, a space occupied by the container is required, and it is difficult to adopt such a blow method for work in a plant with a small space.

When the fluid is a dangerous substance, it is necessary to handle and carry a large amount of dangerous substances, and therefore the work is always dangerous.

The present invention solves the above-mentioned problems with respect to the treatment of fluid in the conventional blow tube branching method, and provides a blow method in which the blow fluid can be directly pressurized and returned to the inside of the main pipe. It is an object.

[Means for Solving the Problems] In order to achieve the above object, in the blow method in the live tube branching method according to the present invention, chips generated when carrying out the live tube branching method are branched from the main tube. In the blow method of collecting with the blow fluid flowing into the pipe, the blow fluid is made to pass through the blow pipe connected to the branch short pipe through the blow valve to the main pipe, and in the process of the blow fluid flowing through this blow pipe, a filter is used. The chips are collected and the blow fluid is filtered, the filtered fluid is depressurized by passing through an orifice, and the depressurized filtered fluid is pressurized by a pressurizing pump in a circulation pipe provided in the blow pipe. Then it was returned to the main.

[Operation] In the live pipe branching method, when the drill of the drilling machine starts to penetrate the main pipe, the fluid flowing through the main pipe begins to blow, and the blow fluid flows into the branch short pipe connected to the main pipe.
Since the branch short pipe, the blow pipe connected to it, the gate valve, and the inside of the drilling machine are already filled with the same fluid as the main pipe, when the pressurizing pump is operated, a pressure difference occurs at the orifice. The fluid starts to move due to the pressure difference, and the blow fluid starts to flow in the blow pipe. In the process of the flow of the blow fluid, the filter collects and collects the chips mixed in the blow fluid. Since the filtered blow fluid is depressurized by passing through the orifice, the pressure is increased in the circulation pipe by the pressurizing pump, and this is injected into the main pipe.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a blow piping diagram for carrying out the blow method of the present invention. The blow pipe 120 is provided between the branch short pipe 102 and the inlet branch pipe 121 connected to the downstream side of the main pipe 100, respectively.
08 and the inlet valve 122 are connected, and the blow pipe 1
A flow meter 109, a filter 123, a flow control valve 110, an orifice 124, a pressurizing pump 125, and a check valve 126 are sequentially provided from the upstream side of 20. A circulation pipe 127 is connected between the upstream side and the downstream side of the pressurizing pump 125, and a check valve 128 and a valve 129 are provided in the fluid flow direction. Further, a bypass pipe 131 having a valve 130 is connected to both sides of the check valve 126. The filter 123 is shown as one, but it is practical to connect two or more filters in parallel and use these filters alternately or sequentially by switching the valves to replace them. .

By configuring the blow pipe 120 as described above, the chips mixed in the blow fluid are captured by the filter 123, and at the same time, the filtered fluid is decompressed by the orifice 124, and the pressure in the main pipe 100 and the orifice The fluid flows through the blow pipe 120 due to the pressure difference from the pressure at the outlet of 124. Then, the pressure-reduced filtered fluid is boosted in the circulation pipe 127 by the pressurizing pump 125 to obtain a pressure higher than the pressure on the downstream side of the main pipe 100 and to be returned to the inside of the main pipe 100 from the feed branch pipe 121. You can

The procedure of the blow method using the blow pipe 120 is as follows.

(Step 1) First, as shown in FIG. 1, the blow pipe 120 is incorporated, and before the start of the perforation of the main pipe 100, the inlet valve 122 and the bypass pipe 131.
The valve 130 and the blow valve 108 are opened, the fluid in the main pipe 100 is introduced through the inlet branch pipe 121, and the blow pipe 120 and the branch short pipe 102,
The gate valve 103 and the punch 104 are all filled with the fluid in the main pipe 100. Whether or not the fluid is filled is determined by opening the release valve 114 provided in the punch 104. After the fluid is filled, the valve 130 and the blow valve 108 are closed. However, only the inlet valve 122 is left open.

(Step 2) When the main pipe 100 is perforated by the perforator 104 and the drill 107 reaches the inside of the main pipe 100 (this can be judged by the reading of the length measuring device attached to the perforator), the inside of the main pipe 100 is The fluid starts moving to the branch short pipe 102.

Therefore, one minute before the point when the drill 107 penetrates, the inlet valve 122 is closed and the pressurizing pump 125 is operated to circulate the fluid in the circulation pipe 127. This is because the fluid is circulated in the closed loop, and if it is carried out for a long time, a load is applied to the pump 125 and the pump 125 fails to operate. Therefore, it is necessary to do it just before the drill 107 penetrates the main pipe.

(Step 3) Then, the blow valve 108 and the inlet valve 122 are opened in anticipation of when the drill 107 starts to penetrate the main pipe 100. Then, the fluid in the blow pipe 120 is fed by the pressurizing pump 125 into the branch pipe 121.
Begins to flow toward. Since the fluid passes through the filter 123 and the orifice 124, a pressure loss occurs, and the pressure loss is increased by the pressurizing pump 125, and the pressure loss is injected into the main pipe 100 from the feed branch pipe 121.

(Step 4) As the boring of the main pipe 100 progresses, the cutter 10 for the main pipe 100
The perforated area by 6 increases, and the flow rate blown accordingly increases. At that time, the valve 129 of the circulation pipe 127 is closed.

Although the blow method according to the present invention has been described above, it goes without saying that a pressure that is boosted by the capacity of the pressurizing pump 125 to be used has a value larger than the pressure value in the main pipe. After the connection of the branch pipe 101 is completed, the blow valve 108
And the feed valve 122 is closed, and the blow pipe 120 is removed.

EFFECTS OF THE INVENTION As described above, according to the present invention, the blow fluid can be directly pressurized and returned to the main pipe, so that a storage container for the blow fluid is not required as in the conventional case, and therefore the space and As a matter of course, transportation and the like are not required, so that there is an effect that the chips can be collected and the blow fluid can be reused more safely and efficiently than ever before.

[Brief description of drawings]

FIG. 1 is a blow piping diagram used in the blow method of the present invention,
2 (a) to 2 (d) are explanatory views showing the procedure of the conventional live tube branching method, and FIG. 3 is an explanatory view showing the chip collecting method in the live tube branching method of FIG. 100 ... Main pipe, 101 ... Branch pipe 102 ... Branch short pipe, 103 ... Gate valve 104 ... Punching machine, 108 ... Blow valve 120 ... Blow piping, 122 ... Inlet valve 123 ... Filter, 124 ... Orifice 125 ... Pressure pump , 127… Circulation pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akira Hagio Akira Marunouchi 1-2-2, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Minor Nemoto 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd. (72) Inventor Mitsugu Oda 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Koji Takayanagi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Incorporated (72) Inventor Mikito Wakamatsu Marunouchi 1-2-2 Nihon Steel Pipe Co., Ltd. Tokyo (72) Inventor Kiyoshi Nakayama Marunouchi 1-2-2 Nihon Steel Pipe Co., Ltd. In the company

Claims (1)

[Claims] 1. A blow method in which chips generated when carrying out a live tube branching method are recovered together with a blow fluid flowing from a main tube into a branch short tube connected to the main tube. To communicate with the main pipe through a blow pipe connected to the pipe via a blow valve,
In the process in which the blow fluid flows through the blow pipe, the chips are collected by a filter and the blow fluid is filtered, and the filtered fluid is depressurized by passing through an orifice. A blow method in a live tube branching method, wherein the pressure is increased by a pressure pump in a circulation pipe provided in the blow pipe and returned to the inside of the main pipe.