Expandable sewer bypass pipe system

Abstract

This invention provides a sewer bypass device that enhances the safety of the workers and improves the efficiency of the work when draining water from a manhole via a bypass pipe while maintaining the flow function of the sewer in a manhole, in situations where there is a large volume of sewage in the sewer pipe and the flow velocity is high. [Solution] The expandable sewer bypass pipe device comprises a small-diameter bypass pipe 08, an expandable bypass pipe inserted into a large-diameter bypass pipe 09, a substantially cylindrical upstream water-stopping plug 06 connected to the small-diameter bypass pipe 08 and in close contact with the inner surface of the outlet of the upstream sewer pipe 03 to prevent water leakage, a substantially cylindrical downstream water-stopping plug 07 connected to the large-diameter bypass pipe 09 and in close contact with the inner surface of the inlet of the downstream sewer pipe 04 to prevent water leakage, a water pressure jack 10 with its end connected to the small-diameter bypass pipe 08 and the large-diameter bypass pipe 09 and made expandable, and an angle 11 positioned to contact the outer circumferential wall surface of the inlet of the downstream sewer pipe 04.

Description

Technical Field

[0001] The present invention mainly relates to a sewage bypass device used to keep the inside of a manhole in a state where water is removed while maintaining the sewage flow function when performing sewage works, by connecting an upstream sewage pipe and a downstream sewage pipe with a bypass pipe to prevent leakage of water from the sewage pipe to the working place.

Background Art

[0002] A sewage bypass device used to prevent leakage of water from the sewage pipe into the manhole is, as in the invention according to Patent Document 1, provided with a water stop plug so as to be in close contact with the inner peripheral surfaces near the outlet of the upstream sewage pipe and the inlet of the downstream sewage pipe, and by connecting both water stop plugs to a bypass pipe, a device that allows sewage to flow down while preventing water leakage from the sewage pipe is known. The installation method is that, in the flowing state, since the construction on the upstream side can be carried out against the flow, it is generally carried out in the procedure shown in the specification of the invention according to Patent Document 1

[0026] , that is, after installing the upstream water stop plug, installing the downstream water stop plug, and connecting a bypass pipe to both installed plugs.

[0003] The installation of this water stop plug and the connection work of the bypass pipe are usually carried out in a place where the sewage flow rate is low, and it is difficult to carry out when the sewage flow rate is large, so there are problems such as a limited working time zone or the work cannot be carried out throughout the day. As a construction method to solve this problem, underwater construction is known, in which a diver guides a water stop plug suspended by a crane to the height of the pipe mouth while confirming it underwater, and the installation of the water stop plug and the connection of the bypass pipe can be carried out underwater. However, although this underwater construction can ensure safety if the water flow velocity is stable, there is a problem that the safety of the diver cannot be ensured in a state where the flow rate is large and the flow velocity is fast.

[0004] Furthermore, when the sewage flow rate is high, a problem arises in that the water-stopping plug may shift in the longitudinal direction when it is installed. As a solution to this problem, it is known to provide a structure as described in the specification of the invention related to Patent Document 1

[0036] , in which the amount of threading of bolts (72) into a plurality of nuts (71) joined to the outer surface of the body (3X) is adjusted to press the stopper (73) against the inner surfaces of the upstream sewer pipe (P1) and the downstream sewer pipe.

[0005] Even if such conventional technologies were combined for construction, it would only increase the amount of work that divers must perform underwater, and would not solve the problem of not being able to guarantee the safety of the divers. On the other hand, the occurrence of floods caused by localized heavy rains and prolonged rain due to climate change is currently increasing, and this trend is expected to continue. Therefore, there is a strong need for the ability to safely carry out emergency sewage construction work in conditions where the water flow rate is high and the flow velocity is high. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 6980204 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the present invention provides a sewage bypass device that can ensure the safety of workers and simplify the work process when removing water from a manhole while maintaining the sewage flow function during sewage construction, even when there is a large amount of sewage in the sewer pipe and the flow velocity is high. [Means for solving the problem]

[0008] The sewer bypass device for solving the aforementioned problems of the present invention comprises: one bypass pipe having an outer diameter the same as or smaller than the inner circumferential surface of the other bypass pipe, and an expandable bypass pipe that is inserted into the other bypass pipe; a substantially cylindrical upstream water-stopping plug connected to the end of the one bypass pipe and in close contact with the inner circumferential surface of the outlet of the upstream sewer pipe to prevent water leakage from the sewer pipe; and a substantially cylindrical plug connected to the end of the other bypass pipe and in close contact with the inner circumferential surface of the inlet of the downstream sewer pipe to prevent water leakage from the sewer pipe. The invention comprises a downstream water-stopping plug, a jack member that connects one end to the exposed circumference of one bypass pipe and the other end to the exposed circumference of the other bypass pipe, thereby making the bypass pipe expandable and contractible, and a water-stopping plug positioning member positioned to contact the outer circumferential wall surface of the inlet of the downstream sewer pipe when the downstream water-stopping plug is inserted into the downstream sewer pipe, and is characterized in that the outlet of the upstream sewer pipe of the manhole and the inlet of the downstream sewer pipe are connected by a sewer bypass pipe. Furthermore, the present invention provides a method for installing a sewage bypass device to solve the aforementioned problems, characterized by the following steps: suspending a retractable sewage bypass pipe device, which has water-stopping plugs connected to both ends of a retractable bypass pipe, from the ground to the height of the sewage pipe inside the manhole while it is retracted; moving it to a position where the water-stopping plug positioning member on the downstream side of the water-stopping plug contacts the outer circumferential wall surface just before the inlet of the downstream sewage pipe; inserting the downstream side water-stopping plug into the inner circumferential surface of the downstream sewage pipe and making it tightly sealed; driving a jack member to extend the retractable bypass pipe; inserting the upstream side water-stopping plug into the inner circumferential surface of the upstream sewage pipe from the outlet and making it tightly sealed; connecting the outlet of the upstream sewage pipe and the inlet of the downstream sewage pipe with the bypass pipe to reduce the sewage flow rate and flow velocity to a certain extent; and then fixing and reinforcing the upstream side water-stopping plug and the downstream side water-stopping plug according to the usual manual. [Effects of the Invention]

[0009] The invention described in Patent Document 1, which is prior art, has the advantage of allowing the installation of a sewer bypass pipe even when the manhole opening is not large enough, by separately installing and connecting each water-stopping plug and bypass pipe. However, since the expandable sewer bypass pipe device of the present invention is expandable, even when the manhole opening is not large enough, it is possible to connect each water-stopping plug and bypass pipe in advance and suspend the bypass pipe in a retracted state inside the manhole. Accordingly, all connections between water-stopping plugs and bypass pipes, and connections between bypass pipes, which are usually performed underwater during underwater construction, can be performed on land, significantly reducing the time spent working underwater and improving the overall safety and efficiency of the construction. Furthermore, since the water-stopping plug positioning member is positioned to contact the outer perimeter wall just before the entrance when the downstream water-stopping plug is inserted into the downstream sewer pipe, the water-stopping plug positioning member acts as a stopper, eliminating the problem of the water-stopping plug shifting in the longitudinal direction even when the sewage flow velocity is high. Furthermore, the installation method for the expandable sewer bypass pipe device according to the present invention has the advantage of being able to reduce the flow rate and velocity of sewage in a manhole while the manhole is unoccupied, even in situations where conventional installation was impossible, such as when there is a large amount of sewage in the sewer pipe and the flow velocity is high. This not only ensures the safety of workers but also allows for construction at times when it is urgent. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of the sewer bypass device according to the present invention when it is inserted and installed only in the downstream sewer pipe. [Figure 2] This is a cross-sectional view showing the sewer bypass device according to the present invention inserted and installed in both the upstream and downstream sewer pipes. [Figure 3] This is a perspective view of the sewage bypass device according to the present invention. [Modes for carrying out the invention]

[0011] The expansionable sewer bypass pipe device of the present invention will be described with reference to the drawings. However, unless otherwise specifically stated, the configuration, drawings, etc., described in this device are not intended to limit the scope of this invention, but are merely illustrative examples.

[0012] (Regarding the configuration of the expandable sewer bypass pipe device according to the present invention) An embodiment of the configuration of the expandable sewer bypass pipe device according to the present invention will be explained based on Figure 1, a cross-sectional view showing the sewer bypass device according to the present invention installed only in the downstream sewer pipe, and Figure 2, a cross-sectional view showing the sewer bypass device according to the present invention installed in both the upstream and downstream sewer pipes. This expandable sewer bypass pipe device 01 connects the upstream sewer pipe 03 and the downstream sewer pipe 04, which lead to the manhole 02, with a bypass pipe to prevent the inflow of sewage from the sewer pipes into the work area inside the manhole 02. In Figures 1 and 2, the outlet of the upstream sewer pipe 03 opens on the left side of the manhole 02's perimeter wall, and the inlet of the downstream sewer pipe 04 opens on the right side of the manhole 02's perimeter wall, with the sewage flowing from left to right (direction of sewage flow 05). The expandable sewer bypass pipe device 01, as shown in Figure 1, comprises a substantially cylindrical downstream water-stopping plug 07 inserted into the inlet of the downstream sewer pipe 04 from the left side in the figure, with its outer circumference in close contact with the inner surface of the downstream sewer pipe 04; a substantially cylindrical upstream water-stopping plug 06 inserted into the inlet of the upstream sewer pipe 03 from the right side in the figure, with its outer circumference in close contact with the inner surface of the upstream sewer pipe 03, as shown in Figure 2; a small-diameter bypass pipe 08 with one end connected to the opposite end of the upstream water-stopping plug 06; a large-diameter bypass pipe 09 with one end connected to the opposite end of the downstream water-stopping plug 07; a hydraulic jack 10 with one end connected to the exposed portion of the small-diameter bypass pipe 08 and the other end connected to the exposed portion of the large-diameter bypass pipe 09; and an angle 11 that contacts the outer surface of the wall just before the inlet of the downstream sewer pipe 04 when the device is installed.

[0013] (Regarding water stop plugs) As shown in Figure 3, the upstream water-stopping plug 06 and the downstream water-stopping plug 07 have a body 12 made of a rigid material that is substantially cylindrical in shape and the same size as the inner surface of the sewer pipe. The side surface of the body 12 has a recess that extends around its entire circumference, and two tubes 13 made of elastic rubber material are fitted into the recess like wheels, with the side ends of the tubes 13 protruding slightly from the body. Therefore, when the upstream water-stopping plug 06 and the downstream water-stopping plug 07 are inserted into the sewer pipe, the side ends of the tubes 13 will adhere tightly to the inner surface of the sewer pipe due to the elasticity of the rubber, thereby preventing water leakage. The method for stopping water leakage from the sewer pipe is not limited to this, as long as it is possible to prevent water leakage from the gap between the sewer pipe and the water-stopping plug of the device when the device according to the present invention is installed.

[0014] (Regarding the water stop plug positioning member) As shown in Figure 1, the angle 11, which is a water-stopping plug positioning member, is installed so as to catch on the side wall just before the inlet of the downstream sewer pipe 04 when the downstream water-stopping plug 07 is inserted into the downstream sewer pipe 04. This acts as a stopper for the installed downstream water-stopping plug 07, preventing it from shifting in the longitudinal direction, especially when the sewage flow rate is high. As shown in Figure 3, installing the angle 11 near the connection between the downstream water-stopping plug 07 and the small-diameter bypass pipe 08 has the advantage of allowing it to be easily removed after the installation of the expandable sewer bypass pipe device 01 is complete, thus not interfering with the work, and also has the advantage that the angle 11 itself is readily available and inexpensive. However, the shape and configuration of the water-stopping plug positioning member are not limited to this, as long as it is a member that has the function of catching on the side wall just before the inlet of the downstream sewer pipe 04.

[0015] (Regarding expandable bypass pipes) In this embodiment, the size of the bypass pipes used is such that the inner diameter of the large-diameter bypass pipe 09 is large enough to accommodate the outer diameter of the small-diameter bypass pipe 08, and that the length is sufficient to install the downstream water-stopping plug 07 into the downstream sewer pipe 04 and the upstream water-stopping plug 06 into the upstream sewer pipe 03 when fully extended, as shown in Figures 1 and 2. The small-diameter bypass pipe 08 is inserted into the hole of the large-diameter bypass pipe 09, one end of the hydraulic jack 10 is connected to the exposed portion of the small-diameter bypass pipe 08, and the other end is connected to the exposed portion of the large-diameter bypass pipe 09. The hydraulic jack 10, which is connected to a pump (not shown), is activated, and as the hydraulic jack 10 operates, the small-diameter bypass pipe 08 inserted into the large-diameter bypass pipe is exposed and extended upstream (to the left), as shown in Figure 2, until the upstream water-stopping plug 06 is inserted into the upstream sewer pipe 03. In Figures 1 and 2, the large-diameter bypass pipe 09 is connected to the downstream water-stopping plug 07. However, as shown in Figure 3, the configuration is not limited to this, and it is possible to have a small-diameter bypass pipe 08 connected to the water-stopping plug, with the large-diameter bypass pipe 09 being used only for the length that requires expansion and contraction. Furthermore, it is desirable that the inner diameter of the large-diameter bypass pipe 09 be the same as or larger than the outer diameter of the small-diameter bypass pipe 08 so that the small-diameter bypass pipe 08 can be inserted into it.

[0016] (Regarding jack components) It is desirable that the hydraulic jack 10 be connected to the pump via a pump hose or the like before the expandable sewer bypass pipe device 01 is lowered into the water. Furthermore, the jack member is not limited to the hydraulic jack 10, as long as it can transmit power from a pump or the like from above ground and slide the bypass pipe to expand and contract. However, this configuration offers the advantages of being easily removable after the installation of the expandable sewer bypass pipe device 01 is complete, similar to the angle 11, thus not interfering with work, and also the advantage that the hydraulic jack 10 itself is readily available and inexpensive.

[0017] (Regarding the advantages of adopting the configuration according to the present invention) The invention according to Patent Document 1, which is the prior art, has the merit that the installation of the sewer bypass pipe can be achieved by separately installing and connecting each water stop plug and bypass pipe, even when the size of the manhole hole is not sufficient. However, since the telescopic sewer bypass pipe device of the present invention is telescopic, even when the size of the manhole hole is not sufficient, each water stop plug and bypass pipe can be pre-connected, and the bypass pipe can be suspended into the manhole in a contracted state. Accordingly, all the connections of the water stop plug and the bypass pipe and the connections between the bypass pipes, which are carried out underwater during underwater construction, can be performed on the ground, significantly reducing the working time underwater and enhancing the safety and efficiency of the entire construction. Also, since the water stop plug positioning member is arranged at a position where it contacts the outer peripheral wall surface in front of the inlet when the downstream water stop plug is inserted into the downstream sewer pipe, the water stop plug positioning member serves as a stopper, and even when the flow rate of the sewage is high, the problem of the water stop plug shifting in the length direction can be solved.

[0018] (Regarding the operating operation of the telescopic sewer bypass device according to the present invention) Next, the operating operation of the telescopic sewer bypass device of the present invention will be described below based on the accompanying drawings. First, as shown in FIG. 1, a wire 15 is passed through a hook 14 attached to the upper surface side of the telescopic sewer bypass pipe device 01, and the wire 15 can be suspended from a mobile crane (not shown). The hydraulic jack 10 has one end connected to the exposed portion of the small-diameter bypass pipe 08 and the other end connected to the exposed portion of the large-diameter bypass pipe 09, and the hydraulic jack 10 and a pump hose (not shown) are pre-connected. Then, the telescopic sewer bypass pipe device 01 suspended by the mobile crane is lowered to the height position of the sewer pipe, and the downstream water stop plug 07, which is the right end of the telescopic sewer bypass pipe device 01, is inserted from the inlet of the downstream sewer pipe 04 and moved to the right until the angle 11 reaches the wall surface in front of the inlet of the downstream sewer pipe. Next, the pump (not shown) to which the pump hose is connected is activated, and the operation of the hydraulic jack 10 causes the small-diameter bypass pipe 08 inserted into the large-diameter bypass pipe 09 to slide upstream (left side), and the upstream water stop plug 06, which is the left end of the expandable sewer bypass pipe device 01, is inserted from the outlet of the upstream sewer pipe 03, and this continues until the water stop plug 08 is fully in place. As shown in Figure 2, when the upstream water-stopping plug 06 is placed inside the upstream sewer pipe 03 and the downstream water-stopping plug 07 is placed inside the downstream sewer pipe 04, as shown in Figure 3, the tube 13 fitted into the recess around the water-stopping plugs will be tightly sealed against the inner surface of the sewer pipes, causing the sewage to flow down the inside of the bypass pipes and preventing water from entering the manhole. The above operations basically do not require a person to enter the water inside the manhole to work. After confirming that the amount and velocity of sewage flowing into the manhole have been reduced or eliminated, a person enters the manhole to fix and reinforce the water-stopping plugs, fix and reinforce the bypass pipes, remove the water pressure jacks 10 and angles 11, and remove the wires 15 attached to the hooks 14.

[0019] (Regarding the advantages of the installation method according to the present invention) The installation method for the expandable sewer bypass pipe device according to the present invention has the advantage of being able to reduce the flow rate and velocity of sewage in a manhole while the manhole is unoccupied, even in situations where conventional installation was impossible, such as when there is a large volume of sewage in the sewer pipe and the flow velocity is high, and not only can the safety of workers be sufficiently ensured, but construction can also be carried out at times when it is urgent. [Explanation of Symbols]

[0020] 01 Extendable Sewer Bypass Device 02 Manhole 03 Upstream sewer pipe 04 Downstream sewer pipe 05 Direction of sewage flow 06 Upstream water stop plug 07 Downstream water stop plug 08 Small Diameter Bypass Pipe 09 Large-diameter bypass pipe 10. Hydraulic jack 11 angles 12 Plug Body 13 tubes 14 hooks 15 wires 16 Water surface

Claims

1. One bypass pipe has an outer diameter that is the same as or smaller than the inner diameter of the other bypass pipe, and is an expandable bypass pipe that is inserted into the other bypass pipe. A substantially cylindrical upstream water-stopping plug is connected to the end of one of the aforementioned bypass pipes and is tightly fitted to the inner surface of the outlet of the upstream sewer pipe to prevent water leakage from the sewer pipe, A substantially cylindrical downstream water-stopping plug is connected to the end of the other bypass pipe and is tightly fitted to the inner surface of the inlet of the downstream sewer pipe to prevent water leakage from the sewer pipe, A jack member is provided, with one end connected to the exposed circumference of one bypass pipe and the other end connected to the exposed circumference of the other bypass pipe, thereby making the bypass pipes extendable and retractable. The downstream water stop plug is inserted into the downstream sewer pipe, and the water stop plug positioning member is positioned to contact the outer circumferential wall surface of the inlet of the downstream sewer pipe. An expandable sewer bypass pipe device characterized by connecting the outlet of the upstream sewer pipe and the inlet of the downstream sewer pipe of a manhole with a sewer bypass pipe.

2. A method for installing an expandable sewer bypass pipe device, characterized by the following steps: in a retracted state, the expandable sewer bypass pipe device, having water-stopping plugs connected to both ends of the expandable bypass pipe, is suspended from the ground to the height of the sewer pipe inside the manhole; the water-stopping plug positioning member on the downstream side of the water-stopping plug is moved to a position where it contacts the outer wall surface just before the inlet of the downstream sewer pipe; the downstream side water-stopping plug is inserted into the inner surface of the downstream sewer pipe and made tightly sealed; the jack member is driven to extend the expandable bypass pipe; the upstream side water-stopping plug is inserted into the inner surface of the upstream sewer pipe from the outlet and made tightly sealed; the outlet of the upstream sewer pipe and the inlet of the downstream sewer pipe are connected by the bypass pipe, reducing the sewer flow rate and flow velocity to a certain extent; and the upstream side water-stopping plug and the downstream side water-stopping plug are fixed and reinforced according to the manual.

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