JPH054635Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial application field] This invention is aimed at, for example, when replacing an old water supply main with a new one. Auxiliary equipment that is installed upstream and downstream and used to perform replacement work without water interruption (carrying out construction work while water is flowing without stopping the flow of water in the water supply main with a pre-installed water control valve) This invention relates to a so-called auxiliary device for replacing existing fluid pipes. In addition to water pipes, petroleum pipelines, sewer pipes, etc. can be used as fluid pipes.

[Prior Art] The present applicant previously disclosed in Utility Application No. 58-91256 (hereinafter referred to as ``prior art'') that ``a device that is installed perpendicular to a water supply main and has a diameter larger than the outside diameter of the water main a bottomed cylindrical perforated tube portion with an open top, which is assembled by sandwiching the water supply main watertightly, and which has an inner diameter of and a branch pipe section that is substantially perpendicular to the water supply main pipe and branches in one direction, and a vertical valve section and a horizontal valve section disposed within the perforated cylinder section, the vertical valve section having a surface thereof It is formed into a concave curved surface, and is arranged so that the concave curved surface faces the active water side and the branch pipe side of the water supply main pipe, and is designed to be watertight with the side wall surface and bottom surface of the perforated cylinder part, and the horizontal We proposed an auxiliary device for water pipe switching work that consists of a flow switching valve whose valve section is placed above the vertical valve section and which ensures watertight contact with the opening.

Therefore, this prior art device is suitable for use in branch work or bypass pipe installation work, and can also be applied to re-installation work. However, since this prior art device is not specially designed for use in cable replacement work, the following problems can be pointed out.

In other words, in order to use the device of this prior art for cable installation replacement work, first, the device from which the flow switching valve has been removed is assembled and fixed to the water mains on the upstream and downstream sides of the replacement section of the water mains, and then installed in the branch pipes. A bypass pipe is installed in the section via a water control valve for the bypass pipe. Next, the water supply main pipe is perforated and cut by a perforator through a working water control valve disposed at the upper end of the perforated cylinder. After that, after removing the perforator and cut piece, connect the flow switching valve via the working water control valve, and connect the concave curved part of the vertical valve part to the active water side of the water main (in the case of this device located at the upstream position, (For those located downstream, the downstream side is referred to as the downstream side.) and the bypass pipe side to ensure watertightness with the side and bottom surfaces of the perforated cylinder, and the horizontal valve part is connected to the opening of the perforated cylinder. Insert it into the perforated tube while ensuring watertightness.
As a result, all of the water flows through the bypass pipe, and in this state, the old pipe in the replacement section is replaced with the new pipe. Thereafter, the flow switching valve is removed via the working water control valve, and the bypass pipe water control valve described above is closed. This will allow all running water to flow into the new pipe. In this state, the bypass pipe is removed and the water control valve for work is removed to complete the water pipe installation work using this device.

Therefore, according to this prior art device, a water control valve is required at the connection of the bypass pipe, and this water control valve is left with the device even after the construction is completed.

For this reason, there are problems such as the cost of installing the water control valve increases and the maintenance and management of the water control valve also requires effort.

[Problem to be solved by the invention] Therefore, in view of the above-mentioned circumstances, the present invention aims to further improve the prior art and provide an auxiliary device for existing pipe work that is convenient and can be used exclusively for pipe replacement work. Consider it a technical issue.

Therefore, the present invention has achieved the above technical problem by specially devising a flow switching valve. That is, although the basic technical idea of the present invention is to use a three-way valve as the flow switching valve, the present invention has adopted a form that can be stably implemented in this type of device operated under continuous water supply.

B. Structure of the invention [Means for solving problems] Specifically, the auxiliary device for replacing existing pipes according to the present invention has the following structure (technical means). That is, it consists of a frame body having a perforated cylinder part and a branch pipe part, and a flow switching valve that is removably inserted into the perforated cylinder part of the frame, and the perforated cylinder part is installed orthogonally to the existing pipe. has an inner diameter larger than the outer diameter of the existing pipe, is assembled by sandwiching the existing pipe in a watertight manner, and has a bottomed cylindrical shape with an open top, and the branch pipe portion is connected to the perforated pipe. The flow switching valve is branched in one direction and communicates with the cylindrical portion, and is substantially orthogonal to the perforated cylindrical portion and the existing pipe, and the flow switching valve includes a vertical valve portion and a horizontal valve portion, and the vertical valve portion water holes are opened on three side surfaces of the bottomed cylindrical body, a closed wall surface is formed in the other direction, and the watertight abuts on the side wall surface and bottom surface of the perforated cylindrical portion, and The horizontal valve part is connected to the upper part of the vertical valve part, and is in watertight contact with the opening of the perforated cylinder part.

Here, the expression that the branch pipe section is "substantially orthogonal" to the perforated tube section and the existing pipe is not limited to an angle of 90 degrees, and the vertical valve section of the flow switching valve performs the required function. It allows a range of angles.

[Operation] The device of the present invention is used as follows. This device from which the flow switching valve has been removed is assembled and fixed on the upstream and downstream sides of the replacement section of the existing main pipe, and bypass pipes are installed in the branch pipe sections upstream and downstream. Then,
The existing main pipe is drilled and cut by a drilling machine via a working water control valve placed at the upper end of the drilling cylinder. after that,
After removing the perforator and the cut piece, install the flow switching valve through the work water control valve, and insert the perforation pipe into the perforation tube with the water passage hole of the vertical valve part facing the live water side and the bypass pipe side of the water main. The horizontal valve part is inserted into the perforated cylindrical part while ensuring watertightness with the side and bottom surfaces of the part, and with watertight contact with the opening of the perforated cylindrical part. Under this condition, the cable replacement work will be carried out.

After that, the flow switching valve is pulled out once and inserted into the perforated cylinder part again so as to close the branch pipe part.
In this state, remove the bypass pipe. After that, the work water control valves, etc. are removed and the equipment is made watertight, thereby completing the existing pipe installation work.

[Example] An example of the auxiliary device for replacing existing pipes (hereinafter simply referred to as "auxiliary device") of the present invention will be described based on the drawings.

1 to 4 show one embodiment thereof. Note that FIGS. 1 and 2 show the installed state of this device after the cable replacement work has been completed.

The following is an explanation using a water pipe as an example.

In the figure, P is a main water supply pipe in a water supply pipeline, and the auxiliary device S of the present invention is attached to a branch pipe installation part of the main water supply pipe P. Q is a cut made by a drilling machine at a branch point of the water main.

This auxiliary device S includes a frame 1, a top cover 2, a side cover 3, and a flow switching valve 4, and the top cover 2 and the side cover 3 are connected to the frame 1.
The flow switching valve 4 can be freely inserted into and removed from the frame body 1.

The frame body 1 consists of a perforated cylinder part 10, an attached pipe part 20, and a branch pipe part 30.

The perforated cylindrical part 10 has an opening 11 in its upper part, and is divided into an upper perforated cylindrical part 10a and a lower perforated cylindrical part 10b with a horizontal plane containing the central axis O of the water supply main P as a boundary. The upper perforated cylindrical part 10a and the lower perforated cylindrical part 10b are assembled together by welding or flange abutting with their end surfaces abutting, and are formed into an integral cylindrical body with an open top and a bottom bottom. Ru. The perforated cylindrical portion 10 has an inner diameter larger than the outer diameter of the main water supply pipe P, and is disposed perpendicular to the main water supply pipe P.
In this embodiment, the lower perforated cylindrical portion 10b is formed to have a bottom and to be as short as possible. In other words, it is sufficient that the cutter of the punching machine described below has the minimum depth to cut the water supply main pipe P.

In this perforated cylinder part 10, a flange 12 is stretched outside the upper end of the perforated cylinder part 10, and
Vertical backing plates 14 are vertically installed from the middle of the perforated cylinder part 10 to the bottom at 90° intervals, avoiding the openings of the attached pipe part 20 and the branch pipe part 30, which will be described later. A horizontal backing plate 16 is fixed to the upper inner circumferential surface of the perforated cylinder portion 10 so as to be connected to the vertical backing plate 14 . The inner surfaces of the vertical backing plate 14 and the horizontal backing plate 16 are on the same circumferential surface centered on the axis of the perforated cylindrical portion 10. Reference numeral 18 denotes bolt holes formed at required positions in the circumferential direction of the cylindrical wall above the horizontal backing plate 16. A locking bolt 7 to be described later in this bolt hole 18
is screwed on.

The attached pipe part 20 is formed continuously with the perforated cylinder part 10, and consists of two semi-tubular members 22 (an upper semi-tubular member 22a, a lower semi-tubular member 22b), an upper half-tubular member and a lower half-tubular member. The water supply main pipe P is held by making the end faces watertight,
This device S will be fixed to the water main pipe P. 2
4 is a joint port at the end of the attached pipe section 20 in the pipe axial direction;
By pressing the rubber ring 24d (which is joined after installation in one piece) with the socket part 24a, the caulking 24b applied inside the socket part 24a, and the press ring (split into two parts) 24c, the attached pipe is removed. The section 20 is made watertight. Note that if the attached pipe section 20 is fixed to the water supply main pipe P by welding or the like and can be made watertight by itself, the joint port 24 can be omitted. or,
It is also possible to omit the semi-tubular member 22 and achieve watertightness around the main water supply pipe of the perforated cylindrical portion 10 using only the joint opening.

The branch pipe section 30 communicates with the perforated tube section 10, is perpendicular to the perforated tube section 10 and the main water supply pipe P, branches in one direction, and has a flange 32 at its end. The branch pipe section 30 of this embodiment is formed, like the perforated tube section 10, by dividing it into upper and lower halves with respect to a plane passing through the central axis O of the main water supply pipe P, and the end faces are integrated by welding or flange joining.

A bypass pipe 9, which will be described later, is arranged in the branch pipe section 30 via the flange 32 thereof.

The upper lid 2 closes the opening 11 of the perforated cylinder part 10 of the frame body 1. That is, the upper part of the opening 11 of the perforated cylinder part 10 is covered and the bolt 3 is attached to the flange 12 of the perforated cylinder part 10.
It is fixed with 4.

The side cover 3 closes the opening of the branch pipe section 30 of the frame body 1.
That is, it is fixed to the flange 32 of the branch pipe section 30 with bolts 36.

The flow switching valve 4 has a vertical valve section 4A and a horizontal valve section 4.
It consists of B.

The vertical valve portion 4A has a bottomed cylindrical body 40 as a base, and vertical stripes are provided on the side and bottom surfaces of the cylindrical body 40 at 90° intervals, corresponding to the vertical backing plates 14 of the frame body 1 described above. 42 are arranged vertically. The vertical strip 42 is provided with a groove 42a into which a packing 5, which will be described later, is mounted. The water holes 44 are formed at three locations on the side surface of the cylindrical body 40 surrounded by the vertical stripes 42 . Therefore, one other side surface forms a closed wall surface 45. Thereby, the vertical valve portion 4A constitutes a so-called three-way valve.

The horizontal valve part 4B consists of a disc body, and the vertical valve part 4A
The outer surface 46 is flush with the vertical strip 44. A groove 46a is formed in the outer surface 46 in the circumferential direction and continues to the groove 42a described above. A protruding rod 48 is protruded from the center of the upper surface of the horizontal valve portion 4B, and a mounting hole 48a for a valve insertion device K, which will be described later, is bored in the side of the protruding rod 48.

The packing 5 has a shape as shown in FIG.
attached to a. The outer diameter of the packing 5 attached to the flow switching valve 4 is larger than the inner diameter of the backing plates 14 and 16 of the frame body 1 in the uncompressed natural state.

This auxiliary device S is further provided with a locking bolt 7 that is screwed into the bolt hole 16 of the perforated tube portion 1. The locking bolt 7 rotates its tip 7a backward when the flow switching valve 4 is inserted into the perforated cylinder 10, and then rotates its tip 7a back when the flow switching valve 4 is installed at a predetermined position. Rotate forward,
The flow switching valve 4 is fixed by being engaged with the upper edge of the horizontal valve portion 4B of the flow switching valve 4. 71 is a cover that covers the locking bolt 7 in a watertight manner.

The upper cover 2 is fixed to the flange 12 of the frame body 1, and presses the upper end of the protruding rod 48 of the flow switching valve 4 with its lower surface, thereby fixing the flow switching valve 4 as a whole together with the locking bolt 7.

Next, the procedure for water pipe installation replacement work performed using the auxiliary device S of this embodiment will be described (Chapter 5).
(See Figures 7 to 7).

(1) The auxiliary device S, from which the top cover 2, side cover 3, and flow switching valve 4 have been removed, is placed upstream and downstream of the replacement section L of the water supply main P, and its upper and lower halves are joined together by collision. By doing so, it is installed around the water main P in a watertight manner. Thereafter, the bypass pipe 9 is attached to the branch pipe section 30 of the auxiliary device S via its flange 32 (see FIG. 5a).

(2) As shown in Fig. 6, the perforated cylinder part 1 of this device S
A water control valve H for non-water cutoff work and a drilling machine I are watertightly attached to the upper part of 0 via a flange 12.
Thereafter, the working water control valve H is opened, and the cutter J of the punching machine I is inserted into the punching cylinder part 10 to cut the water supply main pipe P.

(3) Pull up the cutter J holding the cut piece of the water supply main P to a position above the working water control valve H, and remove the drilling machine I with the water control valve H closed.

In this state, the water in the water supply pipe flows through the main water supply pipe P and the bypass pipe 9.

(4) As shown in Fig. 7, a valve insertion device K with a removable flow switching valve 4 is watertightly attached to the working water control valve H, and the water control valve H is opened and the flow switching valve 4 is inserted. , with the blocking wall surface 45 of the vertical valve portion 4A facing the re-installation section side (that is, facing the downstream side in the case of the upstream auxiliary device S, and facing the upstream side in the case of the downstream side). It is inserted into the perforated cylinder part 10 of the body 1. At this time, the vertical strips 42 of the vertical valve part 4A and the vertical abutment plate 14 of the perforated tube part 10 are aligned in phase with each other, and the packing 5 is inserted while contacting the vertical abutment plate 14, and then the horizontal valve part The packing 5 of the perforated cylinder part 4B comes into contact with the backing plate 15 of the perforated cylinder part, and the vertical valve part 4A is pushed down until it is seated on the bottom of the perforated cylinder part 10.

As a result, all the water in the water supply pipe will flow through the bypass pipe 9.

(5) Carry out cable replacement work in this condition. In other words, the aging old pipe is removed and replaced with a new pipe P' (see Figure 5b).

(6) Once the flow switching valve 4 is pulled out using the valve insertion device K, the vertical valve section 4A is rotated by 90 degrees, and its blocking wall surface 45 is directed toward the branch pipe section 30 as described above.
Insert it into frame 1 again as in (4). As a result, water is allowed to flow through the new pipe P', and water is prevented from flowing through the bypass pipe 9.

Next, the locking bolt 7, which is disposed through the cylinder wall of the perforated cylinder part 10, is made to protrude from the upper end of the horizontal valve part 4B to prevent the flow switching valve 4 from being pushed back by the water pressure.

(7) Disengage the flow switching valve 4 and the valve insertion device K, and then remove the valve insertion device K and the working water control valve H.

(8) The upper cover 2 is fixed to the flange 12 of the perforated cylinder part 1, and the lower surface thereof is pressed against the upper end surface of the protruding rod 48 of the switching valve 4 to fix the flow switching valve 4. At the same time, the bypass pipe 9 was removed and the side cover 3 was removed.
is fixed to the flange 32 of the branch pipe section 30 (see FIG. 5c).

Through the above steps, the water pipe re-laying work using this auxiliary device S is completed.

The present invention is not limited to the embodiments described above, and various design changes can be made within the scope of the basic technical idea of the present invention.

C. Effects of the invention The auxiliary device for replacing existing pipes according to the invention has the following unique effects.

The flow switching valve has a cylindrical shape, and its position is stably maintained within the perforated cylinder portion of the frame, so that the flow switching operation is reliably performed.

Since the flow switching valve has a simple structure, manufacturing costs can be reduced, and even if it is left in place after the construction is completed, the water passage hole can be made sufficiently large compared to the diameter of the existing pipe, so it will not impede water passage in any way.

By using this device, there is no need to install a water control valve from the branch pipe section to the bypass pipe during wiring replacement work, which reduces the cost of installing the water control valve, and improves maintenance management. No problem.

[Brief explanation of the drawing]

The drawings show various aspects of the embodiment of the auxiliary device for replacing existing pipes according to the present invention. (front view), Figure 2 is the X in Figure 1.
- An X-ray cross-sectional view, Figure 3 is a perspective view of the flow switching valve used in this device, Figure 4 is a perspective view of the packing attached to the flow switching valve, and Figures 5 to 7 are process steps. It is an explanatory diagram. P... Water supply main, S... Auxiliary device for water pipe installation work, 10... Perforated cylinder part, 11... Opening part,
30... Branch pipe section, 4... Flow switching valve, 4A...
...Vertical valve part, 40...Cylindrical body, 44...Water hole, 45...Closing wall surface, 4B...Horizontal valve part.

Claims (1)

[Claims for Utility Model Registration] Frame body 1 having a perforated cylinder part 10 and a branch pipe part 30
and a flow switching valve 4 that is removably installed in a perforated cylindrical part 10 of the frame 1, and the perforated cylindrical part 10 is installed perpendicularly to the existing pipe P and is connected to the outside of the existing pipe P. It has an inner diameter larger than the diameter,
The existing pipe P is assembled by sandwiching the existing pipe P in a watertight manner, and has a bottomed cylindrical shape with an opening 11 at the top, and the branch pipe part 30 branches in one direction and communicates with the perforated cylinder part 10, and , is substantially perpendicular to the perforated cylinder part 10 and the existing pipe P, the flow switching valve 4 is composed of a vertical valve part 4A and a horizontal valve part 4B, and the vertical valve part 4A has a bottomed cylindrical body 40. Water holes 44 are opened on the sides in three directions,
A closing wall surface 45 is formed in the other direction and is in watertight contact with the side wall surface and bottom surface of the perforated cylinder section 10, and the horizontal valve section 4B is connected to the vertical valve section 4A.
The opening 1 of the perforated cylindrical portion 10 is connected to the upper part of the
1. An auxiliary device for replacing existing pipes, characterized in that the device is in watertight contact with 1.