JPH0429189Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] For example, as shown in FIG. In water pipe work in which a pipe 1' that detours around point A is installed in place of the removed pipe section 1A to maintain water supply through the existing water pipe 1, a detour water pipe 1' is installed in the existing water pipe 1.
Both ends of the existing water pipe 1 are connected in communication with both ends of the detour water pipe 1', and connection points B,
In each case, this structure is adopted when blocking water flow to the pipe section located between the connection points B and B', that is, the pipe section 1A to be removed. A connection case is attached to the fluid transport pipe, which forms a sealed space between the pipe and the outer surface of the peripheral wall of the pipe, and connects the end of another fluid transport pipe to the sealed space. A communication port for communicating the inside of the fluid transport pipe with the sealed space is provided, and a valve body is provided for closing a portion of the fluid transport pipe located on one side in the longitudinal direction of the pipe with respect to the communication port, and the valve body is provided to connect the fluid transport pipe to the closed space. The present invention relates to a connection structure for a fluid transport pipe, in which a communication port is formed in the fluid transport pipe and a work opening that can be freely opened and closed for inserting the valve body is formed in the connection case in the attached state.

As shown in FIG. 4, this type of fluid transport pipe connection structure includes attaching a connecting case 3 to a fluid transport pipe 1, and continuously connecting an end of another fluid transport pipe 1' to the connecting case 3. After, shutter 14
When the work case 14 with a is attached to the connection case 3 with the work opening 6 closed, the cutter 13 in the work case 14 is inserted into the work opening 6.
The communication port 4 is rotated and inserted into the sealed space 2 through the
Then, with the shutter 14a closed, the cutter 13 is replaced with the valve body 5, the valve body 5 is set in the closing position through the working opening 6, and after the working opening 6 is closed, the work is started. case 14
By adopting a work style in which the fluid is removed, while the fluid is being transported through the fluid transport pipe, the leakage of the transport fluid is prevented, and the connection of another fluid transport pipe to the fluid transport pipe and the fluid transport are carried out. There is an advantage that the pipe portion can be closed at one location with good work efficiency.
In other words, the connection structure for a fluid transport pipe to which the present invention is directed allows for the connection of another fluid transport pipe to the fluid transport pipe and the connection of another fluid transport pipe to the fluid transport pipe without leakage of the transport fluid while transporting fluid in the fluid transport pipe. It was developed in order to easily close the pipe section in one place.

[Prior art]

The conventional connection structure of this type of fluid transport pipe is
As shown in the figure, the communication port 4 is formed in the fluid transport pipe 1 by cutting and removing a portion of the fluid transport pipe over an appropriate length.
3 is a connection case, 5 is a valve body, and 1' is another fluid transport pipe.

[Problem that the invention attempts to solve]

However, in the case of the conventional structure, the side of the pipe that is closed by the valve body located on one side of the communication port is the side that is connected to another fluid transport pipe ( In other words, in the future, by being separated from the pipe section (on the side used for fluid transport) and cut short, it will be supported by the connection case rather than supporting the connection case. Therefore, although the connecting case is attached to both pipe sections, in reality, the connecting case is installed in a cantilevered manner, and therefore, as the fluid flow direction changes within the connecting case, the connecting case The sealing material interposed between the connection case and the fluid transport pipe is caused by the force that causes the connection case to tilt with respect to the fluid transport pipe due to an unavoidable external force in a direction tilted with respect to the pipe axis. Large concentrated stress tends to occur in
In order to prevent this, it is necessary to protect it by wrapping it with a large amount of concrete, and if this is neglected, the airtightness or watertightness will be lost at an early stage, and fluid will easily leak from the connection, which is a drawback.

The purpose of the present invention is to overcome these conventional drawbacks.

[Means to solve the problem]

The characteristic configuration of the fluid transport pipe connection structure according to the present invention is that the communication port is configured in the shape of a hole that leaves a peripheral wall portion that connects the fluid transport pipe sections located on both sides of the pipe in the longitudinal direction, and the valve The body is configured to be able to be moved to a position on the inner peripheral surface side of the fluid transport pipe portion through the communication port in a state where the body is inserted into the closed space through the working opening, and the effects thereof are as follows. That's right.

[Effect]

In other words, regardless of the formation of the communication port, the pipe portion on the side that is closed by the valve body is connected to the pipe portion on the side that is connected to another fluid transport pipe via the peripheral wall, so both pipes in the connection case By attaching the connection case to the section, the connection case can be supported on both sides by the fluid transport pipe, and the connection case can be prevented from tilting. Moreover,
Since the valve body can be set in the closing position through the communication port while being positioned in the closed space through the working opening, there is no need to provide a separate port for setting the valve body.

[Effect of idea]

Therefore, according to the present invention, there is provided a connection structure for fluid transport pipes that can maintain the airtightness and watertightness of the connection case over a long period of time and prevent leakage of fluid from the connection part, and has excellent workability. We have now been able to provide the following.

〔Example〕

As shown in FIG. 3, a pipe section 1A located at a specific point A of an existing water pipe 1 (an example of a fluid transport pipe)
Water pipe construction work in which a pipe 1' (an example of another fluid transport pipe) that bypasses the specific point A is installed in place of the removed pipe section 1A so as to maintain water supply through the existing water pipe 1. , both ends of the detour water pipe 1' are connected to the existing water pipe 1 in communication with each other, and at each connection point B, B' of the existing water pipe 1 with both ends of the detour water pipe 1',
The pipe portion located between those two connection points B and B',
That is, the connection structure on the upstream side of water flow, which is a structure for blocking water flow to the pipe portion 1A to be removed, is configured as follows.

That is, as shown in FIGS. 1 and 2, a sealed space 2 is formed between the outer surface of the peripheral wall of the existing water pipe 1 and the end of the detour water pipe 1' is communicated with the sealed space 2. A connecting case 3 that is flange-connected to the existing water pipe 1 is attached to the existing water pipe 1, and a communication port 4 that connects the inside of the existing water pipe 1 to the sealed space 2 is attached to the existing water pipe 1 in the longitudinal direction of the pipe. A plate-shaped valve body 5 is formed in the shape of a hole leaving a peripheral wall portion 1c connecting the pipe portions 1a and 1b located on both sides of the pipe portions 1a and 1b, and closes the downstream pipe portion 1a of both the pipe portions 1a and 1b. and the existing water pipe 1
When installed, a communication port 4 is formed in the existing water pipe 1, and a work opening 6, which can be opened and closed, for inserting the valve body 5 is formed in the connection case 3.

The connection case 3 is opened in a direction perpendicular to the opening direction of the communication port 4 and the axis of the existing water pipe 1, and is deviated from the axis of the existing water pipe 1. It consists of a main body 3A in which a working opening 6 is formed, and a lid 3B that opens and closes the working opening 6 by being attached to and detached from the main body 3A. The main body 3A connects the two split cases to the existing water pipe 1.
flanges 7a, 7b attached to the cylindrical portions 3a, 3b which are externally fitted onto both the tube portions 1a, 1b;
Both pipe portions 1 are placed in a state where they face the flanges 7a and 7b in the axial direction of the existing water pipe 1, with
The annular members 8a, 8b fitted onto the tubes 1a, 1b are inserted into the cylindrical parts 1a, 1b via bolts/nuts 9a, 9b...
b side so that the annular sealing materials 10a, 10b interposed between the ends of the cylindrical portions 1a, 1b and the annular members 8a, 8b are pressed and fixed to the outer surfaces of the peripheral walls of the tube portions 1a, 1b. By transforming the
The annular members 8a and 8b are used as anchors to be attached and fixed to the existing water pipe 1 in a state where the annular sealing materials 10a and 10b provide a watertight seal between the end portions of the cylindrical portions 1a and 1b and the pipe portions 1a and 1b. Numeral 11 is a bolt for temporarily fixing the lid 3B, and 12 is a pressing member for permanently fixing the lid 3B.

As shown in FIG. 4, the communication port 4 is formed by rotating a cutter 13 having a cutting blade formed on one end of the shaft around the axis along the opening direction of the working opening 6 through the working opening 6. It is formed by inserting and moving it.

The valve body 5 is attached to the lid body 3B.
It is installed to be inserted into the closed space 2 when the main body 3A is installed, and when it is inserted into the closed space 2, it is attached to the lid body 3B along the opening direction of the working opening 6. By swinging around an axis, the connecting case can be moved through the communication port 4 to the closing position, and by providing the swing shaft 5a passing through the lid 3B, the connecting case can be moved in the closed state of the lid. 3. It is configured to be swingable from the outside.

Note that the joint structure on the downstream side of water flow differs from the connection structure on the upstream side of water flow only in that the pipe portion blocked by the valve body 5 is changed to the upstream pipe portion, and the other configurations are the same. Since they are the same, their explanation will be omitted.

The construction procedure will be explained next. In addition, the fourth
As shown in the figure, it can be connected to the main body 3A through a working opening 6 to communicate with the sealed space 2,
The work is carried out using a work case 14 consisting of a cylindrical case portion 14A equipped with a water-stopping shutter 14a and a bottomed case portion 14B that is detachably attached to the cylindrical case portion 14A.

[1] As shown in Figure 4A, attach the connection case 3 to the existing water pipe 1, connect the end of the detour water pipe 1' to the connection case 3, and set the work case 14 to the connection case 3. do.

[2] As shown in Figure 4B, the work case 14
A communication port 4 is formed in the existing water pipe 1 using the internal cutter 13, and then the cutter 13 is moved into the bottomed case part 14B to open the shutter 1.
Close 4a.

[3] Connect the bottomed case part 14B to the cylindrical case part 14A
After removing the lid body 3B with the valve body 5 instead of the cutter 13 and installing it inside the bottomed case part 14B, and attaching the bottomed case part 14B inside the lid body 3B to the cylindrical case part 14A, the shutter 14a is removed.
Open it and temporarily fix the lid 3B to the main body 3A as shown in FIG. 4C.

[4] As shown in Figure 4 D, the work case 14
After removing the lid 3B, the lid 3B is permanently fixed to the main body 3A, and the valve body 5 is swung to the closing position.

[Another example]

[1] The valve body 5 is formed into a bag that expands by pressurizing air to close the pipe portion 1a.

[2] Applicable to connection structures for transport pipes for liquids other than water and gases.

[Brief explanation of the drawing]

Figures 1 to 4 show examples, Figure 1 is a cross-sectional plan view of the main part, Figure 2 is a vertical cross-sectional side view of the main part, Figure 3 is a schematic plan view of the whole, and Figure 4 D is a construction process diagram. FIG. 5 is a schematic cross-sectional plan view showing a conventional example. 1, 1'...fluid transport pipe, 2...closed space, 3
... Connection case, 4 ... Communication port, 5 ... Valve body, 6
...Work opening, 1a, 1b...Fluid transport pipe portion, 3A...Main body, 3B...Lid body.

Claims (1)

[Claims for Utility Model Registration] 1. A closed space 2 between the outer surface of the peripheral wall of the fluid transport pipe 1
A connection case 3 is attached to the fluid transport pipe 1 and connects the end of the separate fluid transport pipe 1' to the closed space 2, and the fluid transport pipe 1 is connected to the fluid transport pipe 1. A valve body 5 that forms a communication port 4 that communicates the inside with the sealed space 2, and that closes a fluid transport pipe portion 1a located on one side of the pipe longitudinal direction with respect to the communication port 4.
A communication port 4 is formed in the fluid transport pipe 1 when the fluid transport pipe 1 is attached to the fluid transport pipe 1, and a work opening 6 that can be opened and closed is formed in the connection case 3 for inserting the valve body 5. In the pipe connection structure of the fluid transport pipe, the communication port 4 is configured in the shape of a hole, leaving a peripheral wall portion 1c that connects the fluid transport pipe portions 1a and 1b located on both sides of the pipe in the longitudinal direction. , when the valve body 5 is inserted into the sealed space 2 through the working opening, the communication port 4
A fluid transport pipe connection structure configured to be able to be moved through the fluid transport pipe portions 1a, 1b to a closing action position on the inner peripheral surface side. 2 The valve body 5 is connected to the main body 3A of the connection case 3.
In practical use, the lid body 3B is attached to a lid body 3B that opens and closes the working opening 6 by attaching and detaching the lid body 3B to a state in which the lid body 3B swings in the closed state to close it through the communication port 4 and move to the closing position. A fluid transport pipe connection structure according to claim 1 of the patent registration claim.