JP2024130069A - Steel pipe elbow emergency repair device and steel pipe elbow emergency repair method - Google Patents

Abstract

[Problem] To provide a steel pipe elbow emergency repair device that can stop drainage leakage from a damaged portion of a steel pipe elbow with a simple operation. [Solution] A steel pipe elbow emergency repair device 10 for repairing a steel pipe elbow 3a located at a bent pipe portion of a drainage pipe 3, comprising a fixed pipe portion 11 that is fixed to the bottom of a drainage basin 2 (the edge of the drainage outlet 2b) while inserted inside the drainage pipe 3 through the drainage outlet 2b, and a flexible pipe portion 12 that is connected to the tip side of the fixed pipe portion 11 and advances inside the drainage pipe 3 along the steel pipe elbow 3a by inserting the fixed pipe portion 11 into the inside of the drainage pipe 3 through the drainage outlet 2b, with the tip portion passing through the steel pipe elbow 3a. [Selected Figure] Figure 2

Description

The present invention relates to an emergency repair device and an emergency repair method for steel pipe elbows, which are steel pipe joints located at the bent portion of a drainage pipe connected to a drainage basin installed in the roadside strip of an elevated bridge portion of a highway, for example.

On the elevated bridges of expressways, for example, drainage pipes are provided that are connected to drainage basins installed on the roadside strips and allow rainwater and other water that has run off the road surface to flow downward.

The drainage pipe installed on the viaduct extends downward from the bottom of the drainage basin, bends via a steel pipe elbow, which is a joint made of steel pipe, and extends in an approximately horizontal direction, then bends via a curved pipe section and extends downward along the pier.

The steel pipe elbows installed on viaducts are made of steel, and so can become corroded and damaged by wastewater over long periods of use.

Therefore, in order to repair a drainage pipe that includes a damaged steel pipe elbow, a pipe repair device is known that repairs the drainage pipe by feeding a lining material into the drainage pipe and covering the damaged portion with the lining material (see, for example, Patent Document 1).

JP 2022-114266 A

Conventional pipe repair devices require multiple components, such as an air hose, a balloon member attached to the tip of the air hose, a guide member attached to the tip of the balloon member, a winding device for winding up the air hose, and a pressure adjustment device connected to the air hose, which results in a large device. Also, when a damaged steel pipe elbow leaks rainwater from the damaged area when it rains, emergency repairs may be required, but conventional pipe repair devices require time to install the device and time to carry out the repairs, making it difficult to provide emergency repairs.

The object of the present invention is to provide a steel pipe elbow emergency repair device and a steel pipe elbow emergency repair method that can stop wastewater leakage from a damaged part of a steel pipe elbow with simple operations.

The steel pipe elbow emergency repair device of the present invention is a steel pipe elbow emergency repair device for emergency repairing a steel pipe elbow located in a bent pipe section of a drainage pipe, and is equipped with a fixed pipe section that is fixed to the edge of the drainage pipe when inserted inside the drainage pipe through a drain outlet, and a flexible pipe section that is connected to the tip side of the fixed pipe section and enters the inside of the drainage pipe along the bent pipe section by inserting the fixed pipe section into the inside of the drainage pipe through the drain outlet, with the tip section passing through the bent pipe section.

In addition, the steel pipe elbow emergency repair device of the present invention has a flexible pipe section in which the end face of the tip is inclined with respect to the extension direction.

In addition, the steel pipe elbow emergency repair device according to the present invention has a flange portion in which the fixed pipe portion extends radially outward in the circumferential direction at the base end and faces the edge of the drain port.

In addition, the steel pipe elbow emergency repair device of the present invention has a sealing portion in which the flange portion closes the gap with the edge of the drain outlet.

In addition, the flange portion of the steel pipe elbow emergency repair device according to the present invention has a suction portion that adheres to the edge of the drain port.

In addition, in the steel pipe elbow emergency repair device of the present invention, the edge of the drain outlet is made of a magnetic material, and the suction part is a magnet.

The steel pipe elbow emergency repair method according to the present invention is a steel pipe elbow emergency repair method using the steel pipe elbow emergency repair device, and includes an insertion step of inserting the steel pipe elbow emergency repair device into the inside of the drain pipe through the drain outlet, and a fixing step of fixing the fixed pipe portion of the steel pipe elbow emergency repair device inserted into the inside of the drain pipe by the insertion step to the edge portion of the drain outlet.

According to the present invention, by inserting and fixing a steel pipe elbow emergency repair device into a drainage pipe, it is possible to direct drainage water downstream of the steel pipe elbow, making it possible to stop drainage water leaking from the damaged part of the steel pipe elbow with a simple operation.

1 is a schematic perspective view of a steel pipe elbow emergency repair device according to a first embodiment of the present invention. FIG. 1 is a side cross-sectional view of a steel pipe elbow emergency repair device according to a first embodiment of the present invention. FIG. 2 is a view of the fixed pipe portion according to the first embodiment of the present invention, as viewed from the outer periphery side. FIG. 3 is a view of the fixed pipe portion according to the first embodiment of the present invention, as viewed from the outside in the axial direction. FIG. 2 is a cross-sectional view of a main part of a fixed pipe portion according to the first embodiment of the present invention. FIG. FIG. 2 is a plan view of a main portion of a fixed pipe portion according to the first embodiment of the present invention. 1 is a diagram illustrating a method for installing the steel pipe elbow emergency repair device according to the first embodiment of the present invention. FIG. 1 is a diagram illustrating a method for installing the steel pipe elbow emergency repair device according to the first embodiment of the present invention. FIG. FIG. 6 is a cross-sectional view of a main part of a fixed pipe portion according to a second embodiment of the present invention. FIG. 11 is a cross-sectional view of a main part of a fixed pipe portion according to a third embodiment of the present invention. FIG. 11 is a plan view of a main part of a fixed pipe portion according to a third embodiment of the present invention.

First Embodiment
Figures 1 to 8 show a first embodiment of the present invention. Figure 1 is a schematic perspective view of the steel pipe elbow emergency repair device, Figure 2 is a side cross-sectional view of the steel pipe elbow emergency repair device, Figure 3 is a view of the fixed pipe part as seen from the outer periphery, Figure 4 is a view of the fixed pipe part as seen from the axial outside, Figure 5 is a cross-sectional view of the main part of the fixed pipe part, Figure 6 is a plan view of the main part of the fixed pipe part, Figure 7 is a view explaining a method of installing the steel pipe elbow emergency repair device, and Figure 8 is a view explaining a method of installing the steel pipe elbow emergency repair device.

As shown in FIG. 1, the steel pipe elbow emergency repair device 10 of the present invention is connected to a catchment basin 2 installed on a roadside strip 1 of an elevated bridge portion of an expressway, for example, and is intended to repair a steel pipe elbow (described later) of a drainage pipe 3 that distributes drainage water such as rainwater flowing along the road surface. Here, the catchment basin 2 is made of a member made of cast iron, which is a magnetic material, and is formed in a box shape with an open top. The catchment basin 2 is embedded so that the top opening is flush with the top surface of the roadside strip 1, and the top opening is closed by a lid 2a. The lid 2a has a hole formed therein through which water such as rainwater can flow.

The drain pipe 3 extends downward from the drain outlet 2b provided at the bottom of the drain basin 2, and is bent by a steel pipe elbow 3a such as a 90-degree elbow as a curved pipe section to extend in an approximately horizontal direction, and is further bent by a joint, for example, to extend downward along the pier. The drain pipe 3 has an inner diameter of, for example, 137 mm.

Here, the steel pipe elbow 3a is made of a steel member. Therefore, if the inner and outer circumferential sides of the steel pipe elbow 3a are corroded and damaged by drainage such as rainwater, drainage will leak from the damaged part of the steel pipe elbow 3a. For this reason, a steel pipe elbow emergency repair device 10 is used to stop drainage from leaking from the damaged part of the steel pipe elbow 3a. The steel pipe elbow emergency repair device 10 does not directly repair the damaged part of the steel pipe elbow 3a, but stops drainage from leaking from the damaged part of the steel pipe elbow 3a. The drainage pipe 3 including the damaged steel pipe elbow 3a will be completely repaired by replacing the steel pipe elbow 3a.

As shown in Figures 1 and 2, the steel pipe elbow emergency repair device 10 comprises a fixed pipe section 11 that is inserted inside the drain pipe 3 through the drain outlet 2b and fixed to the bottom of the drain manhole 2 (the edge of the drain outlet 2b), and a flexible pipe section 12 that is connected to the tip side of the fixed pipe section 11.

The fixed pipe section 11 is made of, for example, a member made of FRP (fiber reinforced plastic). The fixed pipe section 11 is formed in a cylindrical shape with an outer diameter dimension that allows it to be inserted into the inside of the drain pipe 3 from the drain outlet 2b. The fixed pipe section 11 has, for example, an axial dimension of 80 mm, an outer diameter dimension of 102 mm, and an inner diameter dimension of 90 mm. The fixed pipe section 11 has a flange section 11a that extends radially outward in the circumferential direction at the base end and abuts against the bottom of the drain basin 2 located at the edge of the drain outlet 2b.

The flange portion 11a has an outer diameter dimension larger than the inner diameter dimension of the drain outlet 2b. As shown in Figures 3 and 4, a portion of the flange portion 11a can be removed depending on the position of the drain outlet 2b inside the drain basin 2. When the tip side of the fixed pipe portion 11 is inserted inside the drain pipe 3, one side of the flange portion 11a faces the bottom of the drain basin 2.

As shown in FIG. 5, the surface of the flange portion 11a facing the bottom of the catch basin 2 has a sealing portion 11b that closes the gap between the flange portion 11a and the bottom of the catch basin 2, and an adsorption portion 11c that adheres to the bottom of the catch basin 2.

The sealing portion 11b has a chloroprene rubber layer attached to the surface of the flange portion 11a facing the bottom of the catch basin 2 and a sponge rubber layer laminated to the chloroprene layer, and extends circumferentially around the outer periphery of the annular flange portion 11a. The sealing portion 11b closes the gap between the flange portion 11a and the bottom of the catch basin 2 around the circumferential direction of the flange portion 11a.

The suction portion 11c is a magnet, such as a neodymium magnet, that can be attached to the bottom of the catch basin 2. As shown in Figs. 5 and 6, the suction portion 11c is disposed on the inner periphery of the sealing portion 11b that extends in an annular shape in the flange portion 11a. As shown in Fig. 6(a), the suction portion 11c may be a plurality of magnets that are rectangular in plan view and spaced apart in the circumferential direction of the sealing portion 11b, as shown in Fig. 6(b), a plurality of magnets that are round in plan view and spaced apart in the circumferential direction of the sealing portion 11b, as shown in Fig. 6(c), or a ring-shaped magnet in plan view that extends along the sealing portion 11b.

The flexible tube section 12 is, for example, a flexible hose made of an EPDM rubber tube reinforced with a spirally extending polypropylene reinforcing material. The flexible tube section 12 is attached to the fixed tube section 11 by attaching a fastening member 13 such as a hose band to the outer periphery with the fixed tube section 11 inserted at the base end. As shown in Figures 1 and 2, the end surface 12a of the tip end of the flexible tube section 12 is inclined with respect to the extension direction of the flexible tube section 12.

The following describes a method for performing emergency repairs on a damaged steel pipe elbow 3a using the steel pipe elbow emergency repair device 10 configured as described above.

First, a worker performing repair work on the steel pipe elbow 3a removes the cover 2a of the catch basin 2 in the roadside strip 1 to open the opening on the top of the catch basin 2.

Next, as shown in FIG. 7, the worker inserts the tip of the steel pipe elbow emergency repair device 10 into the inside of the drain pipe 3 through the drain outlet 2b of the drain box 2 (insertion process). As a result, the flexible pipe section 12 located at the tip side of the steel pipe elbow emergency repair device 10 enters the inside of the drain pipe 3 along the steel pipe elbow 3a, and the tip passes through the steel pipe elbow 3a. At this time, since the end face 12a of the tip of the flexible pipe section 12 is inclined with respect to the extension direction of the flexible pipe section 12, as shown in FIG. 8, the flexible pipe section 12 passes through the steel pipe elbow 3a of the drain pipe 3 without getting caught on steps such as the joint of the steel pipe elbow 3a inside the drain pipe 3.

Finally, the worker inserts the steel pipe elbow emergency repair device 10 into the inside of the drain pipe 3, and then adheres the suction portion 11c provided on the flange portion 11a of the fixed pipe portion 11 to the bottom of the drainage manhole 2 (fixing process), thereby adhering the sealing portion 11b to the bottom of the drainage manhole 2, and closes the opening at the bottom of the drainage manhole 2 with the lid 2a.

Here, if the surface of the bottom of the catch basin 2 is uneven, or if the suction portion 11c does not adhere to the bottom of the catch basin 2, the fixed pipe portion 11 is fixed to the bottom of the catch basin 2 and the gap between the flange portion 11a and the bottom of the catch basin 2 is closed by filling the gap between the flange portion 11a and the bottom of the catch basin 2 with a water-stopping material such as sealant or putty.

As described above, the steel pipe elbow emergency repair device 10 attached to the drain pipe 3 is arranged so that the gap between the flange portion 11a located at the base end of the fixed pipe portion 11 and the bottom of the drainage basin 2 is closed by the sealing portion 11b, and the tip of the flexible pipe portion 12 passes through the steel pipe elbow 3a. As a result, drainage water such as rainwater that flows into the drainage basin 2 flows inside the fixed pipe portion 11 and the flexible pipe portion 12, and is then released into the part of the drainage pipe 3 located downstream of the damaged steel pipe elbow 3a, making it possible to stop the leakage of drainage water from the damaged part of the steel pipe elbow 3a.

Thus, according to the steel pipe elbow emergency repair device of this embodiment, the steel pipe elbow emergency repair device 10 repairs the steel pipe elbow 3a located at the bent pipe section of the drainage pipe 3, and includes a fixed pipe section 11 that is fixed to the bottom of the drainage manhole 2 (the edge of the drainage outlet 2b) while inserted inside the drainage pipe 3 through the drainage outlet 2b, and a flexible pipe section 12 that is connected to the tip side of the fixed pipe section 11 and enters the inside of the drainage pipe 3 along the steel pipe elbow 3a by inserting the fixed pipe section 11 into the inside of the drainage pipe 3 through the drainage outlet 2b, and whose tip section passes through the steel pipe elbow 3a.

The steel pipe elbow emergency repair method of this embodiment also includes an insertion process for inserting the steel pipe elbow emergency repair device 10 into the inside of the drain pipe 3 through the drain outlet 2b, and a fixing process for fixing the fixed pipe portion 11 of the steel pipe elbow emergency repair device 10 inserted into the inside of the drain pipe 3 by the insertion process to the edge portion of the drain outlet 2b.

As a result, by inserting and fixing the steel pipe elbow emergency repair device 10 into the drainage pipe 3, it is possible to direct the wastewater that has flowed into the drainage basin 2 downstream of the steel pipe elbow 3a, making it possible to stop the leakage of wastewater from the damaged steel pipe elbow 3a with simple work.

It is also preferable that the end face 12a of the tip of the flexible tube section 12 is inclined with respect to the extension direction.

This allows the tip of the flexible pipe section 12 to pass through the steel pipe elbow 3a of the drainage pipe 3 without getting caught on steps such as the joints of the steel pipe elbow 3a on the inside of the drainage pipe 3, making it possible to easily install the steel pipe elbow emergency repair device 10 on the drainage pipe 3.

It is also preferable that the fixed pipe portion 11 has a flange portion 11a that extends radially outward in the circumferential direction at the base end and faces the edge of the drain outlet 2b.

This makes it easy to prevent the fixed pipe portion 11 from falling off the drain outlet 2b.

It is also preferable that the flange portion 11a has a sealing portion 11b that closes the gap with the edge of the drain outlet 2b.

This makes it possible to prevent drainage water from flowing between the outer surface of the fixed pipe section 11 and the inner surface of the drain pipe 3, and reliably stops drainage water from leaking from damaged parts of the steel pipe elbow 3a.

Furthermore, it is preferable that the flange portion 11a has an adsorption portion 11c that adheres to the edge of the drain outlet 2b.

This makes it possible to prevent the fixed pipe section 11 from shifting out of position relative to the drain outlet 2b, and more reliably prevents wastewater from flowing between the outer surface of the fixed pipe section 11 and the inner surface of the drain pipe 3.

It is also preferable that the edge of the drain outlet 2b is made of a magnetic material and the suction portion 11c is a magnet.

This makes it easy to remove the steel pipe elbow emergency repair device 10 from the drain outlet 2b, making it easy to remove the steel pipe elbow emergency repair device 10 when replacing the steel pipe elbow 3a.

Second Embodiment
9 is a cross-sectional view of a main part of a fixed pipe portion, showing a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals.

In this embodiment, the steel pipe elbow emergency repair device 10 has an outer circumferential sealing portion 11b1 provided around the outer circumferential side of the suction portion 11c of the flange portion 11a, and an inner circumferential sealing portion 11b2 provided around the inner circumferential side of the suction portion 11c of the flange portion 11a.

In the steel pipe elbow emergency repair device 10 configured as described above, the suction portion 11c provided on the flange portion 11a of the fixed pipe portion 11 is suctioned to the bottom of the catch basin 2, and the gap between the flange portion 11a and the bottom of the catch basin 2 is closed by the outer peripheral sealing portion 11b1 and the inner peripheral sealing portion 11b2.

As a result, the gap between the flange portion 11a located at the base end of the fixed pipe portion 11 and the bottom of the catch basin 2 is closed by the outer peripheral sealing portion 11b1 and the inner peripheral sealing portion 11b2, and the tip of the flexible pipe portion 12 is positioned so that it has passed through the steel pipe elbow 3a. As a result, as in the above embodiment, water such as rainwater that flows into the catch basin 2 flows inside the fixed pipe portion 11 and the flexible pipe portion 12, and then is released into the part of the drain pipe 3 located downstream of the damaged steel pipe elbow 3a, making it possible to stop wastewater leaking from the damaged part of the steel pipe elbow 3a.

In this way, according to the steel pipe elbow emergency repair device 10 of this embodiment, as in the first embodiment, by inserting and fixing the steel pipe elbow emergency repair device 10 into the drainage pipe 3, it is possible to direct the wastewater that has flowed into the drainage basin 2 to the downstream side of the steel pipe elbow 3a, so that leakage of wastewater from the damaged steel pipe elbow 3a can be stopped with a simple operation.

Third Embodiment
10 and 11 show a third embodiment of the present invention, which are sectional views of the main part of a fixed pipe section, in which the same components as those in the first embodiment are denoted by the same reference numerals.

In the steel pipe elbow emergency repair device 10 of this embodiment, as in the first embodiment, a sealing portion 11b that closes the gap between the flange portion 11a and the bottom of the catch basin 2 is provided on the outer periphery of the surface of the flange portion 11a that faces the bottom of the catch basin 2 in the circumferential direction, and an adsorption portion 11c that adsorbs to the bottom of the catch basin 2 is provided on the inner periphery of the sealing portion 11b.

In addition, the attraction portion 11c in this embodiment has a plurality of magnets 11c1, such as neodymium magnets, and a yoke 11c2, for example made of an iron member, for amplifying the attraction force of the magnets 11c1.

Each of the magnets 11c1 is round in plan view.

The yoke 11c2 is a ring-shaped member that extends circumferentially around the inner periphery of the sealing portion 11b, and holds each of the multiple magnets 11c1 by fitting them into multiple recesses formed along the circumferential direction.

In the steel pipe elbow emergency repair device 10 configured as described above, as in the first embodiment, the suction portion 11c provided on the flange portion 11a of the fixed pipe portion 11 is suctioned to the bottom of the catch basin 2, and the gap between the flange portion 11a and the bottom of the catch basin 2 is closed by the sealing portion 11b.

As a result, the gap between the flange portion 11a located at the base end of the fixed pipe portion 11 and the bottom of the catch basin 2 is closed by the sealing portion 11b, and the tip of the flexible pipe portion 12 is positioned so that it passes through the steel pipe elbow 3a. As a result, as in the first embodiment, water such as rainwater that flows into the catch basin 2 flows inside the fixed pipe portion 11 and the flexible pipe portion 12, and then is released into the part of the drain pipe 3 located downstream of the damaged steel pipe elbow 3a, making it possible to stop drainage leakage from the damaged part of the steel pipe elbow 3a.

In this way, according to the steel pipe elbow emergency repair device 10 of this embodiment, as in the first embodiment, by inserting and fixing the steel pipe elbow emergency repair device 10 into the drainage pipe 3, it is possible to direct the wastewater that has flowed into the drainage basin 2 to the downstream side of the steel pipe elbow 3a, so that leakage of wastewater from the damaged steel pipe elbow 3a can be stopped with a simple operation.

In the above embodiment, the steel pipe elbow emergency repair device 10 is inserted into the drain pipe 3 through the drain outlet 2b formed at the bottom of the drainage basin 2, but this is not limited to the above. The drain outlet is not limited to being formed at the bottom of the drainage basin, but may be formed directly in the roadside belt, or may be formed in a wall extending upward from the roadside belt.

In addition, in the above embodiment, the fixed pipe portion 11 is formed from an FRP member, but this is not limited to this, and a tubular member made of polyvinyl chloride or steel may also be used as the fixed pipe portion.

In addition, in the above embodiment, the flexible tube portion 12 is an EPDM rubber tube reinforced with a spirally extending polypropylene reinforcing material, but this is not limited to this, and it may be formed from other materials as long as it is an annular member that is flexible and maintains a drainage flow path.

2b Drain outlet 3 Drain pipe 3a Steel pipe elbow 10 Steel pipe elbow emergency repair device 11 Fixed pipe section 11a Flange section 11b Sealing section 11b1 Outer circumference side sealing section 11b2 Inner circumference side sealing section 11c Adsorption section 11c1 Magnet 11c2 Yoke 12 Flexible pipe section 12a End face

Claims (7)

A steel pipe elbow emergency repair device for emergency repairing a steel pipe elbow located in a bent pipe portion of a drainage pipe,
A fixed pipe portion is inserted into the inside of the drain pipe through a drain outlet and fixed to an edge portion of the drain outlet;
A steel pipe elbow emergency repair device comprising: a flexible pipe section connected to the tip side of the fixed pipe section, and which enters the inside of the drain pipe along the curved pipe section by inserting the fixed pipe section into the inside of the drain pipe through the drain outlet, with its tip section passing through the curved pipe section. The steel pipe elbow emergency repair device according to claim 1 , wherein the flexible pipe portion has an end face at a tip end which is inclined with respect to an extension direction. The steel pipe elbow emergency repair device according to claim 1 , wherein the fixed pipe portion has a flange portion that extends radially outward in the circumferential direction at a base end portion and faces an edge portion of the drain port. The steel pipe elbow emergency repair device according to claim 3 , wherein the flange portion has a sealing portion that closes a gap between the flange portion and an edge portion of the drain port. The steel pipe elbow emergency repair device according to claim 3 , wherein the flange portion has a suction portion that is suctioned to an edge portion of the drain port. The edge of the drain hole is made of a magnetic material,
The steel pipe elbow emergency repair device according to claim 5 , wherein the attraction portion is a magnet. A steel pipe elbow emergency repair method using the steel pipe elbow emergency repair device according to any one of claims 1 to 6,
An insertion process of inserting the steel pipe elbow emergency repair device into the inside of the drain pipe through the drain outlet;
a fixing step of fixing the fixed pipe portion of the steel pipe elbow emergency repair device inserted into the inside of the drain pipe by the inserting step to an edge portion of the drain outlet.

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