JP2000226860A - Flexible joint construction method for pipe installing part of existing manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint construction method for forming a pipe installing part of an existing manhole as an earthquake resistant structure. SOLUTION: A nozzle of a water jet is inserted into a manhole 1 by cutting the vicinity 6 of a pipe 3 of an invert 5 to be moved as an arrow 13, and clearance 8 is formed by cutting a peripheral wall 2 of the pipe 3 so that a backup material is inserted into this clearance 8. Next, the existing manhole 1 is formed as an earthquake resistant structure by inserting a flexible material into the vicinity part 6 of the pipe 3 of the invert 5 and the clearance 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint method for a pipe mounting portion of an existing manhole.

[0002]

2. Description of the Related Art In recent years, manholes having an earthquake-resistant structure have been installed. However, many existing manholes do not have an earthquake-resistant structure, and the transition to an earthquake-resistant structure is urgent. In order to convert the existing manhole into an earthquake-resistant structure, we are digging it out and moving it to an earthquake-resistant structure, but this requires considerable work. Therefore, a joint method using a flexible material for improving a pipe mounting portion of an existing manhole has been performed.

[0003]

However, the conventional jointing method using a flexible material for improving the pipe mounting portion of an existing manhole requires (1) work on a high traffic road in a city. (2) There is a problem that the cutting tool must be handled in a narrow existing manhole, and (3) It is inferior and dangerous for a person to perform a work such as dropping when dropping.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a flexible joint method for a pipe mounting portion of an existing manhole, in which an invert near a pipe mounting portion of the existing manhole is cut by a water jet, and then the pipe of the mounted pipe is removed. A gap is formed by cutting the surrounding existing manhole with a water jet, and a flexible material is inserted into the gap around the pipe formed by cutting with the water jet. This is a flexible joint method.

[0005]

In the present invention, since the invert near the pipe mounting portion of the manhole and the periphery of the pipe are cut by the water jet of the high-speed water jet jetted from the nozzle, the cut concrete portion is not distorted and fine. Cracks can be prevented from occurring. In addition, it is possible to cut out the curved part and select the correct cutting locus, so that it is less likely to damage the fume tube,
It is possible to efficiently perform the flexible joint method of the pipe mounting portion of the existing manhole.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to improve an existing manhole pipe attachment portion, for example, a fume tube connection portion, to an earthquake-resistant structure using a flexible material. Conventionally, in order to improve the existing manhole into an earthquake-resistant structure, a method of excavating the entire manhole has been performed, but the present invention cuts the invert near the pipe mounting part of the manhole and the periphery of the pipe with a water jet. By doing so, work can be performed without excavating the entire manhole.

The water jet utilizes the energy of a high-speed water jet jetted from a nozzle. For example, high-speed water having a nozzle diameter of 0.1 to 1.0 mm, a water pressure of 250 MPa or more, and a Mach of 2 or more is jetted from the nozzle. Then, it is repeatedly jetted and cut around the invert near the pipe mounting portion of the manhole and around the pipe. In the inverting near the pipe mounting portion of the manhole and the cutting around the pipe by the water jet, it is possible to prevent the occurrence of fine cracks without causing distortion in the cut concrete portion. Further, the invert near the pipe mounting portion and the curved portion around the pipe can be cut out, and an accurate cutting locus can be selected, so that the fume pipe is hardly damaged. In addition, since high-speed water jets are emitted with a small nozzle for cutting, work can be easily performed even in a narrow manhole. It is preferable to mix an abrasive with the jetting water.

For example, since a water jet is jetted by a pump truck capable of being mounted on a 4-ton truck and the invert near the pipe mounting portion of the manhole and the periphery of the pipe can be cut by the water jet, the work can be performed without closing the road. And the work occupation range can be reduced. In addition, the water jet can utilize computer control to achieve unmanned work. Furthermore, the water jet has low vibration, so it can be operated with low vibration.

The flexible material is inserted into the gap and invert around the pipe that has been cut as described above. The flexible material is inserted into the gap around the tube after the backup material is inserted. As the flexible material, a material obtained by adding a filler to an epoxy resin is used, and is injected into a gap around the pipe and coked. Also, a flexible material is inserted into a gap around the pipe, and then the cut portion of the invert is formed into a predetermined shape. The cut portion of the invert is formed of a flexible material or concrete.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing cutting of an invert near a pipe mounting portion of an existing manhole by a water jet, FIG. 2 is a perspective view showing cutting of a periphery of a pipe by a water jet, and FIG. 3 shows insertion of a flexible material. It is sectional drawing. As shown in FIG. 1A, the existing manhole (1) includes a pipe mounting wall (2), a pipe (3), a foundation (4), and an invert (5). The water jet nozzle (10) is inserted into the existing manhole (1) as shown by the arrow, and moved toward the invert (5) as shown by the arrow (11). As shown in FIG. 1 (b), the water jet is moved to cut and dig the vicinity (6) where the pipe (3) of the invert (5) is attached to the wall (2).

Next, as shown in FIG. 2A, a water jet nozzle (12) is inserted into a manhole (1) obtained by cutting a portion (6) near the pipe (3) of the invert (5), and an arrow (13) is formed. 2) to cut the wall (2) around the pipe (3) to form a gap (8) as shown in FIG. 2 (b).

FIG. 3 (a) is a sectional view of FIG. 2 (b), and the invert (5) is cut in the vicinity (6) where the pipe (3) is attached to the wall (2). A gap (8) is formed between the periphery of (3) and the wall (2). FIG.
As shown in (b), a backup material (2
0), and then a flexible joint method of inserting a flexible material into the vicinity (6) and the gap (8) of the pipe (3) of the invert (5) is performed. It is designed to be earthquake-resistant.

Specific working conditions are shown with reference to FIGS. The manhole (1) shown in FIG.
The tube (3) is a fume tube having an inner diameter of 300 mm and a wall thickness of 30 mm. First, the downward nozzle of water jet (1
0) into the manhole (1) as indicated by the arrow, approaching the invert (5), moving as indicated by the arrow (11), and returning the pipe (3) to the wall (2) by returning three to four lines. )
The area (6) attached to the inner part is 300 mm in inner diameter, 440 mm in outer diameter, and 200 mm in length.
Peel in 1 minute. Next, the horizontal nozzle (12) bent by 90 degrees is moved back and forth three to four times as shown by the arrow (13), and as shown in FIG. 2B, the wall (2) around the pipe (3) is moved. Was cut to form a gap (8) of 20 mm.

As shown in FIG. 3B, a flexible material is inserted into the gap (8) and the invert (6) around the cut pipe. After the backup material (20) is inserted into the gap around the pipe, it is coked with a flexible material (21). As the flexible material (21), a material obtained by adding a filler to an epoxy resin is used, and is injected into the gap (8) around the pipe and coked.

[0015]

As described above, according to the flexible joint method of the present invention, the invert near the pipe mounting portion of the manhole and the periphery of the pipe are cut by the water jet of the high-speed water jet jetted from the nozzle. It is possible to prevent the occurrence of small cracks without causing any strain in the concrete portion. In addition, the curved part can be cut out, and the exact cutting locus can be selected, so that the fume tube is less likely to be damaged.Also, work can be performed without closing the road, and the existing manhole tube can be efficiently manufactured in a short time. It is possible to perform a flexible joint construction method for the mounting portion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an embodiment of the present invention.

FIG. 3 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1. Manhole 2. 2. Pipe mounting wall Tube 4. Basic part 5. Invert 10. Downward nozzle 12. Horizontal nozzle 20. Backup material 21. Flexible material

Claims (1)

[Claims] In a flexible joint method of a pipe mounting portion of an existing manhole, an invert near a pipe mounting portion of the existing manhole is cut by a water jet, and then, the existing manhole around the installed pipe is cut by a water jet. A flexible jointing method for a pipe mounting portion of an existing manhole, wherein a gap is formed by cutting, and a flexible material is inserted into a gap around the pipe formed by cutting with the water jet.