JPH07109274B2 - Device for connecting branch pipes to existing fluid transport pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is, for example, as shown in FIG. 4, a pipe located at a specific location (A) of a fluid transportation pipe (1) such as an existing water pipe. While removing the part (1A), a pipe (1 ') that bypasses the specific portion (A) is provided so as to maintain the water supply by the fluid transport pipe (1) instead of the removal pipe part (1A). In the water pipe construction, both ends of the branch pipe (1 ') are connected to the fluid transport pipe (1) so that the fluid transport pipe (1) is connected to both ends of the branch pipe (1') ( In B) and (B ') respectively, it is used to cut off the water flow to the pipe portion located between the connection points (B) and (B'), that is, the pipe portion (1A) to be removed. Regarding the device. More specifically, a sealed case that is attached to a fluid transport pipe to form a sealed space between the fluid transport pipe and the outer peripheral surface of the fluid transport pipe, and that has an opening / closing counter pipe working port; Connection of a branch pipe to an existing fluid transport pipe provided with connecting means for connecting one of the cut ends formed by cutting a pipe portion of an appropriate length located in a closed case to the end of the branch pipe For equipment.

[Conventional technology]

In a conventional device for connecting a branch pipe to an existing fluid transport pipe of this type, as shown in FIG.
At the end of the branch pipe (1 '), the connecting part (2
A) is formed, and a partition plate (21) that allows only one of the cut ends to communicate with the connection part (2A) in a state in which the communication between the cut ends of the fluid transport pipe (1) is blocked is internally provided. Thus, the connecting means is formed.

[Problems to be Solved by the Invention]

However, when using the conventional device, when performing the water pipe work described at the beginning in the state of uninterrupted water without interrupting the water supply by the water pipe, after mounting the closed case on the water pipe, measures for the closed case Before inserting the cutting device through the work opening and cutting out the pipe part of an appropriate length of the water pipe, connect a valve or branch pipe to the connection part of the sealed case to prevent water leakage from the connection part. I need to put it. When connecting a valve, an extra valve is required, which leads to cost increase.When connecting a branch pipe, a branch pipe must be laid before cutting the pipe. There is a restriction on the order of work processes, such as having to do so, which hinders rationalization of connection work.

An object of the present invention is to provide a connecting device that can inexpensively and efficiently work a pipe connection while continuously maintaining fluid transportation by a fluid transportation pipe.

[Means for Solving the Problems]

The characteristic configuration of the device for connecting a branch pipe to an existing fluid transport pipe according to the present invention is that a counter pipe is attached to the fluid transport pipe to form a closed space between the fluid transport pipe and the outer peripheral surface of the fluid transport pipe, and the open / closed pipe is openable. A closed case having a working port, and one of the cut ends formed by cutting out a portion of the fluid transport pipe that is located inside the closed case and has an appropriate length to connect to the end of the branch pipe. A device for connecting a branch pipe to an existing fluid transport pipe provided with a connecting means, wherein the connecting means is a separate body from the sealing case, and seals a portion formed by cutting off the fluid transport pipe portion. It is constituted by a three-way valve consisting of a valve box arranged in the case inner space and a valve body installed in the valve box, and the three-way valve is constructed such that the valve box has a cut end of each of the fluid transport pipes. Connected at three points, with the end of the branch pipe The valve body is provided with a connecting port so that one of the cut ends of the fluid transport pipe selectively communicates with the other cut end of the fluid transport pipe. In addition, the sealed case,
Operation means for connecting the three-way valve from the outside of the closed case to the cut end of the fluid transport pipe is provided.

[Action]

The effect of taking the above technical means is as follows.

After attaching the sealed case to the fluid transport pipe, cut the pipe part of the appropriate length of the fluid transport pipe with a cutting device located in the sealed case, and then insert a three-way valve through the opposite pipe working port of the sealed case. Insert it at the connection point to the cut end of the fluid transport pipe and connect the three-way valve to the cut end by operating means,
Next, the hermetic case is removed from the fluid transport pipe, the end of the branch pipe is connected to the three-way valve, and then the three-way valve is operated to connect the fluid transport pipe to the branch pipe.

And since the connection port for connecting the branch pipe is formed in the valve box of the three-way valve instead of the closed case, only the closed case is used to cut the pipe portion of the fluid transport pipe of an appropriate length and then the three-way valve is It is possible to prevent the transport fluid from leaking and obstructing the fluid transport through the fluid transport pipe until the installation.

Moreover, because the three-way valve is used to switch from the state in which one of the cut ends of the fluid transport pipe communicates with the other cut end to the state in which one of the cut ends communicates with the end of the branch pipe,
By keeping the three-way valve in a state where one of the cut ends is in communication with the other cut end, even if the sealed case is removed from the fluid transport pipe in that state, branching is performed while ensuring fluid transport in the fluid transport pipe. It is possible to prevent the transport fluid from leaking from the connection part of the three-way valve for connecting the ends of the pipes. Thereby, as a working mode, not only a configuration in which a branch pipe is installed and then a three-way valve is attached to and connected to a fluid transport pipe, but also a three-way valve is attached to a fluid transport pipe and then a branch pipe is installed and connected The form can also be adopted.

〔The invention's effect〕

As a result, according to the present invention, the workability of the work of connecting the branch pipe to the fluid transport pipe while carrying out the fluid transport in the fluid transport pipe can be improved by increasing the degree of freedom of the work form, and the branch pipe It has become possible to provide a device for connecting a branch pipe to an existing fluid transport pipe, which can reduce the cost because a dedicated valve is not required for closing the connection port for connecting the ends of the pipe.

〔Example〕

 Next, examples of the present invention will be described.

As shown in FIG. 4, a branch pipe for removing a pipe portion (1A) located at a specific location (A) of a fluid transportation pipe (1) such as an existing water pipe and bypassing the specific location (A). In the water pipe construction in which (1 ') is provided so as to maintain the water supply by the fluid transport pipe (1) instead of the removal pipe portion (1A), the branch pipe (1') is attached to the fluid transport pipe (1). ), Both ends of which are communicated with each other, and connection points (B) of the fluid transport pipe (1) with both ends of the branch pipe (1 ′),
(B ′) In both of them, the connection points (B),
A device for blocking water flow to the pipe part located between (B '), that is, the pipe part (1A) to be removed, and the connecting device on the water flow upstream side is a closed case (2). And connecting means and operating means.

As shown in FIG. 3, the sealed case (2) is attached to the fluid transport pipe (1) to form a sealed space (3) between the fluid transport pipe (1) and the outer peripheral surface thereof. And
It is divided into a plurality of parts in the circumferential direction so as to be attachable to and detachable from the fluid transport pipe (1). Further, the closed case (2) has a pipe working port into which a cutting device (4) for cutting and removing a pipe portion of an appropriate length located inside the fluid transport pipe (1) is attached. (5) is provided. A valve (6) is attached to the pipe working port (5), and the valve (6) has a size such that the cutting device (4) can be installed inside the cutting device (4). A water blocking case (8) slidably held through an operating shaft (7) for insertion into and removal from the sealed case (2) is detachably attached.

Therefore, as shown in FIG. 3 (a), the valve (6) is opened, the cutting device (4) is inserted into the closed case (2) and moved, and a pipe portion of an appropriate length of the fluid transport pipe (1) is provided. And the cutting device (4) together with the cutting part of the water-stop case (8)
The valve (6) is closed after being pulled up to the inside, so that the cutting operation can be performed while water is being passed through the fluid transport pipe (1).

The connecting means is means for connecting the upstream cut end of the cut end of the fluid transport pipe (1) formed by the cutting, to the end of the branch pipe (1 ′), Specifically, of the cut ends of the fluid transport pipe (1), a three-way valve that selectively connects the cut end on the upstream side to the cut end on the downstream side and the end of the branch pipe (1 '). It is formed with (9).

As shown in FIGS. 1 and 2, the three-way valve (9) includes a valve box (10) having a size capable of passing through the counter pipe working port (5) of the closed case (2), and the valve thereof. It consists of a rotary valve body (11) mounted in a box (10).

The valve box (10) is provided with a first tube (10A) for forming a passage, in which a flange (10a) for connecting to the cut end of the fluid transport pipe (1) is connected near both ends. 1 cylinder (10A)
Of the second tube (10B) is fixed to the intermediate portion in the longitudinal direction of the sheet so as to traverse the second tube (10B), and a flange (for connecting to the end of the branch pipe (1 ') is attached to the peripheral wall of the second tube (10B)). The third cylinder (10c) for connecting passages, which is connected to the first cylinder (10b), is continuously arranged so as to be positioned in a posture orthogonal to both the first cylinder (10A) and the second cylinder (10B). A first opening (S1) that connects the upstream end passage (A1) in the cylinder (10A) to the inside of the second pipe (10B) and the downstream passage (A) in the other end of the first cylinder (10A).
A second opening (S2) for communicating 2) with the second cylinder (10B),
A third opening (S3) that connects the passage (A3) in the third cylinder (10C) to the second cylinder (10B) is formed.

The second cylinder (10B) has its axis (X) as the first cylinder (10A).
It is arranged so as to be displaced toward the third cylinder (10C) side with respect to the axis center (Y).

The valve body (11) rotates around the axis (X) of the second cylinder (10B) in a state of sliding on the inner peripheral surface of the second cylinder (10B), whereby the third opening A split cylinder-shaped shield plate (11A) that can be switched between a first position that closes (S3) and a second position that closes the second opening (S2) closes both ends of the second cylinder (10B). To the valve rod (11B) supported on the lid (10D) via a pair of upper and lower fan-shaped arms (11C).
1A) has a plurality of straightening vanes (11D) continuously arranged at intervals along the inner peripheral surface thereof.

Incidentally, (12) is a sealing material that seals between the valve box (10) and the valve body (11), and is attached to the valve box (10) or even to the valve body (11). good.

The operating means is, as shown in FIGS. 1 and 3, a cut end of the fluid transport pipe (1) and a first cylinder (10A) of the three-way valve (9) positioned concentrically with the cut end. A seal ring (13) is provided slidably in the axial direction so as to close the gap between the cut end and both ends of the first tubular part (10A) by fitting over both ends of the seal ring (13). ) Is slid in the axial direction, and a screw shaft (14) is provided so as to penetrate the sealed case (2).

A flange (13a) for joining to the flange (10a) of the first cylinder (10A) via a bolt and nut (15), and the seal ring (13) are provided in the seal ring (13).
The seal ring (13) is pressed between the cutting end and the cutting end to fix the seal ring (13) to the cutting end in a sealed state. The flange (13b) for this is installed continuously. In addition, (19) is an O-ring for water stop held on the inner periphery of the seal ring (13), and (20) is a seal ring (1
3) and the water-tight packing provided on the flanges (13a) and (10a) of the first cylinder (10A).

In the connection device on the downstream side of water flow, in the connection device on the upstream side of water flow described above, the three-way valve (9) of the connection means is connected to the downstream side of the cut end of the fluid transport pipe (1). The cut ends are different from each other only in the function of making the cut ends on the upstream side and the ends of the branch pipe (1 ') communicate with each other, and the structures are the same, and therefore the description thereof will be omitted. .

Next, the procedure for waterworks with uninterrupted water is listed in that order.

[1] As shown in FIG. 3 (a), the valve (6) is opened, and the cutting device (4) is inserted into the closed case (2) and moved to adjust the length of the fluid transport pipe (1) to an appropriate value. Cut the pipe section.

[2] After pulling the cutting device (4) and the cut pipe portion up to the inside of the water blocking case (8) and closing the valve (6),
After removing the water shut-off case (8) from the valve (6) and attaching the three-way valve (9) to the operating shaft (7) of the water shut-off case (8) in place of the cutting device (4), the operation is performed as shown in FIG. The water shut-off case (8) is attached to the valve (6) as shown in FIG.

[3] As shown in FIG. 3 (c), the valve (6) is opened to connect the three-way valve (9) to the cut end in the closed case (2), that is, the valve box (10). Insert the first cylinder (10A) to a position where it is located on the same axis as the cut end, operate the screw shaft (14) of the operating means, and fit the seal ring (13) onto the cut end only. From the position where the cutting end and the first tube (10
The three-way valve (9) is temporarily connected to the cut end by sliding it to the connection position where it is fitted over the end of (A).

[4] As shown in FIG. 3 (d), the closed case (2) is removed from the fluid transport pipe (1) to expose the three-way valve (9), and the three-way valve (9) and the seal ring (13) are connected. The flanges (10a) and (13a) are connected to each other, the push ring (17) and the seal ring (13) are connected to each other, and the three-way valve (9) is installed in the fluid transport pipe (1).

[5] The branch pipe (1 ') is connected to the three-way valve (9) and the three-way valve (9) is operated to connect the branch pipe (1') to the fluid transport pipe (1).
And the pipe part (1A) is removed.

Of course, in the steps [3] and [4], the three-way valve (9) is operated and held in a state in which the cut ends communicate with each other.

[Another embodiment]

 Another embodiment of the present invention will be described below.

[1] As the three-way valve (9), as shown in FIG. 5, the axis (X) of the valve body (11) and the axis (X) of the first cylinder (10A) intersect. May be. In short, the form and structure of the three-way valve (9) can be changed appropriately.

[2] The structure of the operating means can be changed as appropriate.

[3] The present invention can be applied to the connection of various fluid transport pipes (1) such as gas pipes other than water pipes.

[4] In the above embodiment, the closed case (2) was attached to the fluid transport pipe (1) and then the cutting device (4) was inserted into the closed case (2) for cutting.
Attach the cutting device (4) to the fluid transport pipe (1), and then
The closed case (2) may be attached and cut.

[5] In the claims, reference numerals are added for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a vertical plan view of a main portion, FIG. 2 is a cross-sectional side view of the main portion, and FIGS. 3 (a) to 3 (d) are construction works. FIG. 4 is a plan view of the use state, and FIG. 5 is a vertical cross-sectional plan view of a main part showing another embodiment of the present invention. FIG. 6 is a vertical plan view showing a conventional example. (1) ... Fluid transport pipe, (1 ') ... Branch pipe, (2) ...
… Sealed case, (3) …… Sealed space, (5) …… Piping work port, (9) …… Three-way valve, (10) …… Valve box, (11) ……
Valve body.

Claims (1)

[Claims] 1. A closed space (3) is formed between the fluid transport pipe (1) and the outer peripheral surface of the fluid transport pipe (1),
In addition, a closed case (2) having an openable / closable pipe working port (5) and a cutout of a portion of the fluid transport pipe (1), which is located in the closed case (2) and has an appropriate length. An apparatus for connecting a branch pipe to an existing fluid transport pipe, which is provided with a connecting means for connecting one of the formed cut ends to the end of the branch pipe (1 '), the connecting means comprising: A valve box (10) which is separate from the closed case (2) and is arranged in the inner space of the closed case (2) formed by cutting off the fluid transport pipe (1) portion;
The three-way valve (9) comprises a valve body (11) mounted in the valve box (10), and the three-way valve (9) has the valve box (10) and the fluid transport pipe (1). Of the fluid transport pipe (1), the valve body (11) is provided with connection ports connected to three locations of the respective cut ends and the end of the branch pipe (1 '). It is provided so that the other cut end and the end of the branch pipe (1 ′) are selectively communicated with the cut end of the above. Further, the closed case (2) is provided with The three-way valve (9)
A device for connecting a branch pipe to an existing fluid transport pipe, which is provided with an operating means for connecting the outside of the closed case (2) to the cut end of the fluid transport pipe (1).