JPH05132995A - Connection method with existing pipe in sewer pipe - Google Patents

Abstract

(57) [Summary] [Purpose] A construction method for sewer pipes that enables good drainage of construction sites for existing sewer pipes and manhole repair sites without the use of drainage pumps, etc. I will provide a. [Structure] In connection work between the existing sewer main 2 and manhole 1 and the new sewer main 4, a bypass pipe 8 is installed on both sides of the axis of the existing sewer main 2 and a bypass pipe 8 is installed. The remaining part is the water stop plate 5a,
It is closed at 5b and further turned around, bypass pipe 8 and water stop plate 5
A space between each outer peripheral portion of a and 5b and the inner wall of the existing sewer main 2 is sealed with an air tube 6, and the new sewer pipe 4 is connected to the existing sewer main 2 located between the two water stop plates. did.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to construction of sewer pipes, and more particularly to a method of connecting an existing pipe and a new pipe in the sewer pipe.

[0002]

2. Description of the Related Art In a conventional construction method for sewer pipes, when installing a new sewer pipe to an existing sewer pipe or repairing a manhole, the water stoppage to prevent the sewer from flowing into the construction site is A sandbag is piled up in the manhole upstream of the construction site to stop the water. After stopping the water, the sewage flowing into the upstream manholes, etc. is pumped up by a drainage pump to bypass the construction site and discharged to the existing sewer pipes and manholes downstream, where new pipes are installed and manholes are repaired. ing.

[0003]

However, the above-mentioned conventional construction method for a sewer pipe has the following problems. Sewerage has a constant flow rate due to household miscellaneous wastewater, factory wastewater, etc., so it is almost impossible to block water like water supply. In the case of rain, a large amount of rainwater temporarily flows in, and drainage pumps often cannot drain the drainage from construction sites of existing sewer pipes and manhole repair sites. In addition, as manholes gather sewer pipes at several locations,
At the time of rehabilitation, there is a problem with the wastewater treatment of this sewage, and it is often necessary to install drainage pumps in manholes other than the manhole at the rehabilitation site, and many drainage pumps are often required. Therefore, an object of the present invention is to perform good drainage at an existing sewer pipe construction site or manhole renovation site without using a drainage pump,
An object of the present invention is to provide a construction method for a sewer pipe that can secure a good work place for the construction.

[0004]

The present invention has achieved the above object in the work of connecting a sewer pipe and an existing sewer pipe to a new sewer pipe in a manhole. That is, a semi-cylindrical turning bypass pipe is installed on one side of the axis of the existing sewer pipe, and at the axial ends of the turning bypass pipe, the remaining part of the existing sewer pipe is closed with water stop plates. The gap between the outer circumference of the bypass bypass pipe and the water stop plate and the inner wall of the existing sewer pipe is sealed with an air tube, and the sewage flows in the bypass bypass pipe. Connect the new sewer pipe to the pipe. When another existing small diameter sewer pipe is connected to the existing sewer pipe, the circular water stop plate is fixed while the circular water stop plate is fixed in the small diameter sewer pipe, and the outer periphery of the circular water stop plate is sealed. The sewage from the water collecting port is circulated through the flexible tube attached to the water collecting port and discharged into the bypass pipe.

[0005]

[Operation] In the connection method of the sewer pipe of the present invention with the existing sewer pipe, when connecting the existing sewer pipe and the new sewer pipe,
Since an assembly-type diversion bypass pipe or flexible tube pipe that diverts the inflow of sewage into the working space is installed in the existing sewer pipe, even when connecting the existing sewer pipe and the new sewer pipe, etc. The drainage can be performed as before the work. Therefore, since the connection work place can be satisfactorily secured without using a drainage pump or the like, the connection work can be performed more easily than before.

[0006]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. The present invention is not limited to this. FIG. 1 is a plan view of a connecting portion between an existing sewer pipe and a new sewer pipe in a manhole by an assembly-type turnaround bypass pipe 8 showing an embodiment of the present invention. Figure 2
It is a principal part figure which looked at the bypass bypass pipe 8 installed in the existing sewer main 2 shown in FIG. 1 from the downstream side. In the existing manhole 1, existing sewer mains 2 and existing sewer branches 3 are gathered from the left and right with the manhole 1 as the center. In addition, normally, sewage always flows through the existing sewer main pipe 2 and the existing sewer branch pipe 3. The new sewer pipe 4 is a sewer pipe to be newly attached to the concrete wall of the manhole 1, and as shown in FIG. 5, the new sewer pipe 4 is attached after excavation by the shield machine 14 arranged on the shield shaft 15.

A method of connecting the existing sewer main 2 and the existing sewer branch 3 to the new sewer 4 in the manhole 1 will be described below. First, the bypass pipe 8 is assembled inside the manhole 1 and the existing sewer main pipe 2. This is because it is difficult to insert the bypass bypass pipe 8 into the manhole 1 and the existing sewer main 2 in the assembled state. The bypass bypass pipe 8 has a semi-cylindrical shape and is arranged on one of the left and right sides with respect to the axial direction in the existing sewer main pipe 2 so that the sewage can pass through the bypass pipe 8 in the working space 11. The partition plate 5c of the bypass bypass pipe diverts the work space 11 so that sewage does not flow. As shown in FIGS. 1 and 2, in order to prevent sewage from flowing into the remaining part of the existing sewer pipe where the bypass bypass pipe 8 is arranged, semicircular stoppers are provided at both ends in the axial direction of the bypass bypass pipe 8. Water plates 5a and 5b are arranged. In this embodiment, the water blocking plates 5a and 5b were turned around and attached to the bypass pipe 8. The method for fixing the turning bypass pipe 8 and the water blocking plates 5a, 5b to the concrete wall of the existing sewer main 2 is to secure the water blocking plate 5 and the turning bypass pipe 8 etc. by the fixing bolts 7 so as not to be washed away by the sewage. To firmly fix it to the concrete wall. Furthermore, the outer peripheral portions of both ends of the bypass bypass pipe 8 in the axial direction and the water stop plates 5a, 5
An annular air tube 6 for preventing water leakage is provided on the outer circumference of b, and air is injected into the tube by the pump to inflate it, thereby forming a concrete inner wall of the existing sewer main 2,
The outer periphery of the bypass bypass pipe 8 and the outer peripheral edges of the water blocking plates 5a and 5b are sealed to prevent water leakage to the working space 11. As described above, the sewage flowing in the existing sewer main 2 flows only in the bypass bypass pipe 8 as shown in FIG.

Next, construction is carried out so that the sewage flowing through the existing small-size sewage branch pipe 3 is diverted to flow into the bypass pipe 8 and further into the downstream sewer pipe. FIG. 3 is a view of the circular water stop plate 12 installed in the existing sewer branch pipe 3 as viewed from the upstream side.
FIG. 4 is a sectional view of the periphery of the circular water blocking plate 12 installed in the existing sewer branch pipe 3 shown in FIG. First, the circular water stop plate 12
Is installed in the existing sewer branch 3. At this time, the circular water blocking plate 12 and the like are fixed by the fixing bolts 7 so that they are not washed away by the sewage.
To firmly fix the existing sewer branch pipe 3 to the concrete wall. Further, air is pumped into the doughnut-shaped air tube 10 provided on the outer periphery of the circular water stop plate 12 to inflate it, and the outer periphery of the circular water stop plate 12 and the existing sewer branch pipe 3
The inner wall of the is sealed to prevent water leakage. The sewage in the existing sewage branch pipe 3 is circulated by the flexible tube pipe 9 attached to the water collecting port 13 of the circular water blocking plate 12, flows into the bypass pipe 8, and is further discharged to the downstream sewer pipe. As described above, since the sewage does not flow into the working space 11 shown in FIG. 1 and the work can be performed in a favorable environment without water leakage, the work of attaching the new sewer pipe 4 to the concrete wall of the manhole 1 can be easily performed. When the above work is completed, the turning bypass pipe 8 is divided and removed, and other work tools are also removed,
The connection work for the new sewer pipe 4 is completed.

[0009]

According to the method of connecting a sewer pipe to an existing pipe of the present invention, by installing a prefabricated diversion bypass pipe or a flexible tube pipe in the existing pipe,
All drainage is drained to the mainstream, which allows good drainage when connecting existing pipes and new pipes, and because the connection work location can be secured well, without using a drainage pump, etc. The connection work can be performed more easily than before.
Also, even when the water level increases due to heavy rain or the like, the normal pipe diameter of the existing pipe can be secured by removing the water blocking plate.

[Brief description of drawings]

FIG. 1 is a plan view of a connecting portion between an existing sewer pipe and a new sewer pipe in a manhole by an assembly-type turn around bypass pipe or the like showing an embodiment of the present invention.

FIG. 2 is a principal view of a bypass bypass pipe installed in the existing sewer main shown in FIG. 1 as viewed from the downstream side.

FIG. 3 is a view of the existing sewer branch pipe shown in FIG. 1 viewed from the upstream side.

FIG. 4 is a cross-sectional view around a circular water stop plate installed in the existing sewer branch pipe shown in FIG.

FIG. 5 is a cross-sectional view of a connection portion between an existing sewer pipe and a new sewer pipe in a manhole.

[Explanation of symbols]

 1 Manhole 2 Existing sewer main 3 Existing sewer branch 4 New sewer 5 Water stop plate 6 Air tube 8 Turning bypass pipe 9 Flexible tube 10 Donut type air tube 13 Water intake

Claims (2)

[Claims] 1. In connection work between a sewer pipe and an existing sewer pipe in a manhole and a new sewer pipe, a semi-cylindrical turning bypass pipe is installed on one side of the axis of the existing sewer pipe, and the turning bypass pipe is installed. The remaining part of the existing sewer pipe is closed at both ends in the axial direction of the pipe with a water stop plate, and further cut off, and the gap between the outer circumference of the bypass pipe and the water stop plate and the inner wall of the existing sewer pipe is sealed with an air tube. A method for connecting a new sewer pipe to an existing sewer pipe at a position between two water blocking plates, with the sewer pipe being in a state of flowing through the bypass bypass pipe. 2. An existing sewer pipe having a small diameter is connected to the existing sewer pipe, and a circular water stop plate is fixed in the sewer pipe having a small diameter, and the outer periphery thereof is sealed with an air tube to make a circular water stop. The method for connecting a sewer pipe to an existing pipe according to claim 1, wherein the sewage from the water collection port is diverted through the flexible tube attached to the water collection port of the plate to flow into the bypass pipe.