Water-stopping devices and bypass system construction methods

Abstract

In the water-stopping device used in the bypass system construction method, the aim is to simplify the configuration and installation work, and to enable the use of pipes with the largest possible diameter for the bypass unit to be installed. [Solution] The water-stopping device 4 used in the bypass system construction method comprises a seal case 41 and a seal ring 42. The seal case 41 is fixed to the inner surface of the peripheral wall of the manhole 2 near the end of the first pipeline 1A and near the end of the second pipeline 1B by mounting members (43, 44), and has a cylindrical portion 41a with an annular plate portion 41b. The seal ring 42 has a body 42a, an outer lip 42b that is pressed against the inner circumferential surface of the end of the first pipeline 1A and the end of the second pipeline 1B, and an inner lip 42c that is pressed against the outer circumferential surface of the pipes (bypass pipe 31, inner cylinder 32b of the expansion joint 32) that constitute the bypass unit 3.

Description

Technical Field

[0001] The present invention relates to a water stop device and a bypass system construction method.

Background Art

[0002] For example, Patent Document 1 describes that "when performing correction and repair work inside a manhole of a sewer, an air injection type water stop plug 33 is installed near the inlet of the sewer pipe 31Bb on the upstream side of the construction location A to block the flow of sewage to the construction location A."

[0003] Also, Patent Document 1 describes that "next, the sewage blocked by the water stop plug 33 is sucked by a bypass pipe 35a inserted into the manhole 31Aa on the upstream side of the construction location A and a pump 34 installed on the road 37, and is discharged from a bypass pipe 35b inserted into the manhole 31Ac on the downstream side of the construction location A into the downstream sewer pipe 31Bd with sandbags 36 stacked at the inlet to prevent the backflow of sewage."

[0004] Furthermore, Patent Document 1 describes that "the water stop plug 1 has a structure in which two O-rings 8, 8 are sandwiched by a base plate 2 and a pressing plate 9 in a state where they are adjacent in the axial direction (not the axis of the tube but the axis of the ring)."

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the above-mentioned Patent Document 1, there are concerns that the structure of the "water-stopping plug 1" is complex, and that the installation work will be too time-consuming.

[0007] Furthermore, as shown in Figure 5 of Patent Document 1, the structure of the water-stopping plug 1 has a thicker radial thickness, which raises concerns that the diameter of the bypass pipe 19 of the bypass unit 16 may become smaller, resulting in insufficient sewage flow within the bypass unit 16.

[0008] In view of these circumstances, the present invention aims to simplify the structure and installation of a water-stopping device used in a bypass system construction method, and to enable the use of pipes with the largest possible diameter for the bypass unit to be installed. Furthermore, the present invention aims to simplify construction work in a bypass system construction method. [Means for solving the problem]

[0009] The water-stopping device according to the present invention is a water-stopping device used in a bypass system construction method in which the ends of a first pipeline and the ends of a second pipeline, which are installed horizontally in the ground, are connected so as to be open at opposing positions on the periphery wall of a manhole, and when inspecting and repairing the manhole, the ends of the first pipeline and the ends of the second pipeline are connected by a bypass unit, and comprises a seal case and a seal ring, the seal case having a cylindrical portion inserted at a distance from the inner diameter side of the ends of the first pipeline and the ends of the second pipeline, and extending radially outward from the inner end of the cylindrical portion to the inner end of the manhole and on the inner surface of the periphery wall of the manhole The seal ring is characterized by having an annular plate portion fixed by mounting members near the end of the first pipeline and near the end of the second pipeline, and having a body fitted onto the outer circumference of the cylindrical portion of the seal case and in contact with the inner circumferential surfaces of the ends of the first pipeline and the second pipeline, an outer lip extending radially outward toward the outside of the manhole and pressed against the inner circumferential surfaces of the ends of the first pipeline and the second pipeline, and an inner lip extending radially inward toward the outside of the manhole and pressed against the outer circumferential surface of the pipe constituting the bypass unit.

[0010] Thus, since the water-stopping device according to the present invention has a configuration that includes the seal case, the seal ring, and the mounting member (for example, an anchor bolt), the configuration is simpler than that of conventional examples, and it becomes possible to use pipes with the largest possible diameter for the bypass unit to be installed.

[0011] Furthermore, the water-stopping device according to the present invention is configured such that the seal case is fixed to the surrounding wall of the manhole with mounting members (for example, anchor bolts, etc.), and the seal ring is fitted onto the outer circumference of the cylindrical part of the seal case. Therefore, the installation work is simpler compared to conventional examples.

[0012] Incidentally, the body of the water-stopping device is formed to be hollow and expands when fluid is supplied under pressure to the hollow portion, pressing against the outer surface of the cylindrical portion and the inner surfaces of the end of the first pipe and the end of the second pipe. The water-stopping device may further have a nozzle attached to the body, to which a pressurizing device for supplying fluid under pressure to the hollow portion of the body is connected.

[0013] Furthermore, the bypass system construction method according to the present invention is characterized in that, in a structure in which the end of a first pipeline and the end of a second pipeline, which are installed horizontally underground, are connected so as to be open at opposing positions on the perimeter wall of a manhole, the end of the first pipeline and the end of the second pipeline are connected with a bypass unit using a water-stopping device when inspecting or repairing the manhole, and the method includes pre-work for installing the water-stopping device and post-work for installing the bypass unit.

[0014] The bypass unit comprises a bypass pipe, one end of which is inserted into the inner diameter side of the end of the first pipeline, and an expansion joint, one end of which is connected to the other end of the bypass pipe via a watertight joint, and the other end of which is inserted into the inner diameter side of the end of the second pipeline.

[0015] The water-stopping device comprises a seal case and a seal ring, the seal case having a cylindrical portion inserted at a distance from the inner diameter side of the end of the first pipeline and the end of the second pipeline, and an annular plate portion extending radially outward from the inner end of the cylindrical portion to the inner end of the manhole and fixed by mounting members near the end of the first pipeline and the end of the second pipeline on the inner surface of the manhole's peripheral wall, the seal ring having a body fitted onto the outer circumference of the cylindrical portion of the seal case and in contact with the inner circumferential surfaces of the end of the first pipeline and the end of the second pipeline, an outer lip extending radially outward toward the outside of the manhole and pressed against the inner circumferential surfaces of the end of the first pipeline and the end of the second pipeline, and an inner lip extending radially inward toward the outside of the manhole and pressed against the outer circumferential surface of the pipe constituting the bypass unit.

[0016] In the aforementioned preliminary work, the annular plate portion of the seal case is positioned on the inner surface of the manhole's peripheral wall so that it faces the region where the end of the first pipeline is located and the end of the second pipeline is located, and the seal case is fixed in place with its cylindrical portion inserted into the inner diameter side of the end of the first pipeline and the end of the second pipeline; and the seal ring is fitted onto the outer circumference of the cylindrical portion of the seal case.

[0017] The subsequent steps include: connecting the outer cylinder of the expansion joint to the other end of the bypass pipe using the watertight joint; inserting one end of the bypass pipe loosely into the inner diameter side of the cylindrical portion of the seal case located at the end of the first pipeline; and pulling out the inner cylinder of the expansion joint from the outer cylinder, thereby inserting the inner cylinder loosely into the inner diameter side of the cylindrical portion of the seal case located at the end of the second pipeline.

[0018] Incidentally, the body of the water stop device is formed hollow and expands when fluid is pressurized and supplied to the hollow portion, and is configured to be in pressure contact with the outer peripheral surface of the cylindrical portion and the inner peripheral surfaces of the ends of the first pipeline and the second pipeline. The water stop device can further include a nozzle that is attached to the body and to which a pressurizing device for pressurizing and supplying fluid to the hollow portion of the body is connected.

[0019] Also, in the bypass system construction method, the step of pressurizing and supplying fluid from the nozzle to the hollow portion of the body of the seal ring can be configured to be performed as necessary.

Advantages of the Invention

[0020] According to the water stop device of the present invention, it becomes possible to simplify the configuration and the installation work, and it becomes possible to use a bypass unit pipe to be installed with a larger diameter as much as possible.

[0021] Also, according to the bypass system construction method of the present invention, the construction work can be simplified.

Brief Description of the Drawings

[0022] [Figure 1] It is a cross-sectional view showing a pipeline in which a bypass system construction method is performed using the water stop device according to an embodiment of the present invention. [Figure 2] It is a view of the cross-section taken along the line (2)-(2) of FIG. 1 as seen from the arrow direction. [Figure 3] It is an enlarged view of the water stop device located on the end side of the second pipeline in FIG. 1. [Figure 4] It is a view showing the initial process of the bypass system construction method. [Figure 5] It is a view showing the process following FIG. 4. [Figure 6] It is a view showing the process following FIG. 5. [Figure 7] It is a view showing the process following FIG. 6. [Figure 8] It is a view showing the process following FIG. 7. [Figure 9] A cross-sectional view showing a pipeline constructed using a bypass system method with a water-stopping device according to another embodiment of the present invention. [Figure 10] This diagram shows the initial steps of the bypass system construction method. [Figure 11] This figure shows the process that follows Figure 10. [Figure 12] This figure shows the process that follows Figure 11. [Figure 13] This figure shows the process that follows Figure 12. [Figure 14] This figure shows the process that follows Figure 13. [Modes for carrying out the invention]

[0023] The best embodiment for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Figures 1 to 8 show a bypass system construction method and a water-stopping device according to one embodiment of the present invention.

[0025] In this embodiment, for example, the first pipeline 1A and the second pipeline 1B, which constitute a sewer pipe, are formed, for example, with a circular cross-section, and are arranged horizontally underground so that their central axis is approximately parallel to the ground.

[0026] In this embodiment, water flows from the second pipeline 1B on the right side of the manhole 2 to the first pipeline 1A on the left side. In this case, the first pipeline 1A becomes the downstream pipeline, and the second pipeline 1B becomes the upstream pipeline. However, for example, water may flow from the first pipeline 1A on the left side of the manhole 2 to the second pipeline 1B on the right side. In this case, the first pipeline 1A becomes the upstream pipeline, and the second pipeline 1B becomes the downstream pipeline.

[0027] As an example of a bypass system construction method, as shown in Figure 1, in a structure in which the end of the first pipeline 1A and the end of the second pipeline 1B are connected so as to be open at opposing positions on the perimeter wall of the manhole 2, when inspecting or repairing the inside of the manhole 2, the end of the first pipeline 1A and the end of the second pipeline 1B are temporarily connected with a bypass unit 3, and water is stopped between the end of the first pipeline 1A and the bypass unit 3 and between the end of the second pipeline 1B and the bypass unit 3 with water-stopping devices 4,4, thereby allowing water to flow directly from the first pipeline 1A to the second pipeline 1B. After the inspection and repair of the manhole 2, the bypass unit 3 is removed.

[0028] The bypass unit 3 includes a bypass pipe 31, an expansion joint 32, a watertight joint 33, a sealing rubber 34, and the like.

[0029] The expansion joint 32 is configured such that an outer cylinder 32a is fitted into an inner cylinder 32b so as to be axially slidable, and is designed to be flexible.

[0030] The outer cylinder 32a of this expansion joint 32 has the same outer and inner diameter as the bypass pipe 31B. This outer cylinder 32a is connected to the bypass pipe 31 by a watertight joint 33, with the two cylinders butted together in the axial direction.

[0031] The watertight joint 33 connects the bypass pipe 31 and the outer cylinder 32a of the expansion joint 32, and is, for example, a watertight joint manufactured by Victaulic Japan.

[0032] The sealing rubber 34 has a single lip and is attached to the right end side of the outer cylinder 32a of the expansion joint 32 via the sealing case 34a.

[0033] The water-stopping device 4 is used when connecting the end of the first pipeline 1A through which water flows to the end of the second pipeline 1B with a bypass unit 3, and includes a seal case 41, a seal ring 42, and the like.

[0034] The seal case 41 is made of, for example, steel, and is fixed to the outer surface of the manhole 2 by mounting members (anchor bolts 43 and nuts 44), as shown in Figures 1 and 4.

[0035] This seal case 41 has a configuration in which a cylindrical portion 41a and an annular plate portion 41b are integrally provided.

[0036] The annular plate portion 41b is provided so as to extend radially outward from one end of the central axis of the cylindrical portion 41a.

[0037] As shown in Figure 2, numerous through-holes 41c are provided in the lower half-circumferential region of the annular plate portion 41b. The through-holes 41c are provided to reduce the resistance caused by water inside the manhole 2 during the construction of the bypass unit 3.

[0038] As shown in Figure 4, the seal ring 42 is attached to the seal case 41 and has a body 42a, an outer lip 42b, an inner lip 42c, a nozzle 42d, etc.

[0039] The body 42a is hollow and is fitted onto the outer diameter side of the cylindrical portion 41a of the seal case 41, so as to come into contact with the outer circumferential surface of the cylindrical portion 41a of the seal case 41 and the inner circumferential surfaces of the end of the first conduit 1A and the end of the second conduit 1B, respectively.

[0040] The outer lip 42b extends radially outward from the outer circumference of the outer surface (the side where water is present) of the body 42a.

[0041] The outer lip 42b of the left seal ring 42 is pressed against the inner circumferential surface of the end of the first pipe 1A, and the outer lip 42b of the right seal ring 42 is pressed against the inner circumferential surface of the end of the second pipe 1B.

[0042] The inner lip 42c extends radially inward from the inner circumference of the outer surface of the body 42a and is installed to be longer than the outer lip 42b.

[0043] The inner lip 42c of the left-side seal ring 42 is pressed against the outer surface of the spigot bypass pipe 31A, and the inner lip 42c of the right-side seal ring 42 is pressed against the outer surface of the inner cylinder 32b of the expansion joint 32.

[0044] The nozzle 42d is bolt-shaped and is attached to one point on the circumferential direction of one side of the body 42a so as to connect the hollow part inside the body 42a with the outside.

[0045] A passage 42e is provided at the center of the entire length of the nozzle 42d, passing through it along the central axis. The head of the nozzle 42d is inserted into the hollow portion of the body 42a, thereby preventing it from coming loose.

[0046] The threaded shaft portion (not shown in the reference numerals) of the nozzle 42d is inserted through the annular plate portion 41b of the seal case 41 and is also inserted into the hollow part inside the body 42a at one point in the circumferential direction on one side of the body 42a from a position between the outer lip 42b and the inner lip 42c. The nozzle 42d is fixed to the seal case 41 by screwing a nut 42g onto the portion of the threaded shaft portion that protrudes outward from the annular plate portion 41b of the seal case 41. A wrench hook 42f is provided on this threaded shaft portion to prevent the nozzle 42d from rotating when the nozzle 42d is installed.

[0047] Furthermore, a pressurizing device (not shown) is connected to the nozzle 42d as needed. When a fluid (e.g., air, water, oil, etc.) is supplied under pressure from the outer end of the passage 42e of the nozzle 42d by this pressurizing device, the body 42a of the seal ring 42 expands radially and axially, causing it to press against the outer circumferential surface of the cylindrical portion 41a of the seal case 41 and the inner circumferential surfaces of the ends of the first pipe 1A and the second pipe 1B, respectively.

[0048] Next, the bypass system construction method will be explained with reference to Figures 4 to 8.

[0049] First, as shown in Figure 4, with water flowing out of the first pipeline 1A and the second pipeline 1B into the manhole 2, multiple anchor bolts 43 (corresponding to mounting members) are installed so as to be embedded in the inner surface of the manhole 2's peripheral wall. The seal case 41 is then attached to these anchor bolts 43, and nuts 44 are screwed on to fix the seal case 41 to the inner surface of the manhole 2's peripheral wall.

[0050] At this time, the seal case 41 is positioned so as to cover the area on the inner surface of the manhole 2 where the end of the first pipeline 1A and the end of the second pipeline 1B are located, and the cylindrical portion 41a of the seal case 41 is inserted into the inner diameter side of the end of the first pipeline 1A and the end of the second pipeline 1B at a predetermined distance (see Figure 5).

[0051] Next, as shown in Figure 5, the seal ring 42 is fitted onto the outer circumference of the cylindrical portion 41a of the seal case 41, and then the threaded shaft portion of the nozzle 42d of the seal ring 42 is inserted through the annular plate portion 41b of the seal case 41, and a nut 42g is screwed onto the threaded shaft portion to fix the seal ring 42 to the seal case 41 (see Figure 6).

[0052] As a result, the outer lip 42b of the left seal ring 42 is pressed against the inner surface of the end of the first pipe 1A, and the outer lip 42b of the right seal ring 42 is pressed against the inner surface of the end of the second pipe 1B (see Figure 6).

[0053] If the inner circumferential surfaces of the ends of the first pipe 1A and the second pipe 1B are in poor condition, a pressurizing device (not shown) can be connected to the nozzle 42d of the seal ring 42. By supplying pressurized fluid to the hollow portion of the body 42a using this pressurizing device, the body 42a can be expanded and pressed against the inner circumferential surfaces of the ends of the first pipe 1A and the second pipe 1B, and the outer circumferential surfaces of the cylindrical portions 41a of the left and right seal cases 41, respectively. The tip of this nozzle 42d is closed by attaching a shut-off plug (not shown).

[0054] Then, as shown in Figure 6, the outer cylinder 32a of the expansion joint 32 is abutted against the right end of the bypass pipe 31, and the abutted portion is connected with a watertight joint 33. After that, the bypass pipe 31 and the expansion joint 32 are suspended by a wire 7, and as shown in Figure 7, the left end of the bypass pipe 31 is loosely inserted into the inner diameter side of the seal case 41 located at the end of the first pipeline 1A.

[0055] As a result, the inner lip 42c of the left-side seal ring 42 is pressed against the outer surface of the bypass pipe 31 (see Figure 7).

[0056] Furthermore, as shown in Figure 8, the inner cylinder 32b of the expansion joint 32 is pulled out to the right from the outer cylinder 32a and loosely inserted into the inner diameter side of the seal case 41 located at the end of the second conduit 1B. As a result, the inner lip 42c of the seal ring 42 on the right side is pressed against the outer surface of the inner cylinder 32b of the expansion joint 32.

[0057] Finally, by activating the drainage pump 5 located at the bottom of manhole 2, the water present in manhole 2 is discharged from the drainage hose 6 to the outside of manhole 2 and pipeline 1.

[0058] In this way, the end of the first pipeline 1A and the end of the second pipeline 1B can be connected within the manhole 2 using the bypass unit 3.

[0059] In this configuration, the overlapping portion between the end of the first pipeline 1A and the bypass pipe 31, and the overlapping portion between the end of the second pipeline 1B and the inner cylinder 32b of the expansion pipe 32 are sealed by the water-stopping device 4. Furthermore, the connection between the bypass pipe 31 and the outer cylinder 32a of the expansion pipe 32 is sealed by the water-stopping joint 33, and the space between the outer cylinder 32a and the inner cylinder 32b of the expansion pipe 32 is sealed by the sealing rubber 34. As a result, the end of the first pipeline 1A and the end of the second pipeline 1B are connected within the manhole 2 in a sealed state by the bypass unit 3.

[0060] As described above, the water-stopping device 4 according to the embodiment to which the present invention is applied has a configuration that includes a seal case 41, a seal ring 42, and an anchor bolt 43 (corresponding to a mounting member), so its configuration is simpler than that of the conventional example. Furthermore, this water-stopping device 4 is configured so that it can be installed by simply fixing the seal case 41 to the peripheral wall of the manhole 2 with the anchor bolt 43, and then fitting the seal ring 42 onto the outer circumference of the cylindrical portion 41a of the seal case 41, thus simplifying the installation work compared to the conventional example.

[0061] Furthermore, since the total radial thickness of the seal case 41 and seal ring 42 constituting the water-stopping device 4 according to this embodiment is thinner than that of the conventional example, even when the distance between the end of the first pipeline 1A and the bypass pipe 31, and the distance between the end of the second pipeline 1B and the inner cylinder 42b of the expansion joint 32 are small, the installation of the water-stopping device 4 at the aforementioned distances becomes easier compared to the conventional example.

[0062] Based on these considerations, the water-stopping device 4 according to this embodiment has a simpler structure and easier installation compared to conventional examples, thus contributing to reduced installation time and costs. Furthermore, it becomes possible to use the largest possible diameter bypass pipe 31 for the bypass unit 3 to be installed, which is advantageous in ensuring sufficient water flow within the bypass unit 3.

[0063] Furthermore, according to the bypass system construction method of this embodiment, a water-stopping device 4 with a simple configuration and easy installation is used, and the inner cylinder 32b of the bypass pipe 31 or expansion pipe 32 is inserted into the inner diameter side of the seal case 41 in a loose-fit state. As a result, it is not necessary to precisely align the inner cylinder 32b of the bypass pipe 31 or expansion pipe 32 when inserting it, which simplifies the construction work of the bypass unit 3 and contributes to shortening construction time and reducing construction costs.

[0064] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate within the scope of the claims and equivalents thereof.

[0065] (1) For example, Figures 9 to 14 show other embodiments of the present invention. These embodiments are modified versions of the embodiment shown in Figure 1. In these embodiments, the bypass unit 3 comprises an inlet bypass pipe 31A, an intermediate bypass pipe 31B, an expansion joint 32, a watertight joint 33, and a sealing rubber 34.

[0066] The inlet bypass pipe 31A and the intermediate bypass pipe 31B have the same outer and inner diameters, and they are arranged side by side in the axial direction and butted together, and connected by a watertight joint 33.

[0067] The other configurations are basically the same as those of the embodiments shown in Figures 1 to 8.

[0068] Next, the bypass system construction method will be explained with reference to Figures 10 to 14.

[0069] First, with water flowing from pipeline 1 into manhole 2, anchor bolts 43 are installed so as to be embedded in the surrounding wall of manhole 2, a seal case 41 is attached to these anchor bolts 43, and the seal case 41 is fixed to the surrounding wall of manhole 2 by screwing on nuts 44 (same as in Figure 4).

[0070] At this time, the seal case 41 is positioned so as to cover the area on the inner surface of the manhole 2 where the end of the first pipeline 1A is located and the end of the second pipeline 1B with the annular plate portion 41b of the seal case 41, and the cylindrical portion 41a of the seal case 41 is inserted into the inner diameter side of the end of the first pipeline 1A and the end of the second pipeline 1B with a predetermined distance between them.

[0071] Next, the seal ring 42 is fitted onto the outer circumference of the cylindrical portion 41a of the seal case 41, and then the threaded shaft portion of the nozzle 42d of the seal ring 42 is inserted through the annular plate portion 41b of the seal case 41, and a nut 42g is screwed onto the protruding portion of the threaded shaft portion to fix the seal ring 42 to the seal case 41 (same as in Figure 5).

[0072] As a result, the outer lip 42b of the left seal ring 42 is pressed against the inner circumferential surface of the end of the first pipe 1A, and the outer lip 42b of the right seal ring 42 is pressed against the inner circumferential surface of the end of the second pipe 1B.

[0073] If the inner circumferential surfaces of the ends of the first pipe 1A and the second pipe 1B are in poor condition, a pressurizing device (not shown) can be connected to the nozzle 42d of the seal ring 42. By supplying pressurized fluid to the hollow portion of the body 42a using this pressurizing device, the body 42a can be expanded and pressed against the inner circumferential surfaces of the ends of the first pipe 1A and the second pipe 1B, and the outer circumferential surfaces of the cylindrical portions 41a of the left and right seal cases 41, respectively. The tip of this nozzle 42d is closed by attaching a shut-off plug (not shown).

[0074] Then, as shown in Figure 10, with the Socket Bypass Pipe 31A suspended by the wire 8, the left end of the Socket Bypass Pipe 31A is loosely inserted into the inner diameter side of the seal case 41 located at the end of the first conduit 1A (see Figure 11).

[0075] As a result, the inner lip 42c of the left-side seal ring 42 is pressed against the outer surface of the spigot bypass pipe 31A.

[0076] Furthermore, as shown in Figure 11, with the intermediate bypass pipe 31B suspended by the wire 9, the left end of the intermediate bypass pipe 31B is abutted against the right end of the slit bypass pipe 31A, and the abutted portion is connected by a watertight joint 33 (see Figure 12).

[0077] Then, as shown in Figure 12, the expansion joint 32 is suspended by the wire 10, and the left end of the outer cylinder 32a of the expansion joint 32 is abutted against the right end of the intermediate bypass pipe 31B, and the abutted portion is connected by a watertight joint 33 (see Figure 13).

[0078] Next, as shown in Figure 14, the inner cylinder 32b of the expansion joint 32 is pulled out to the right of the outer cylinder 32a and loosely inserted into the inner diameter side of the seal case 41 located at the end of the second conduit 1B.

[0079] As a result, the inner lip 42c of the seal ring 42 on the right side is pressed against the outer surface of the inner cylinder 32b of the expansion joint 32.

[0080] Finally, a drain hose 6 is connected to the inlet 31a located at the upper part of the intermediate region of the intermediate bypass pipe 31B, and a drain pump 5 located at the bottom of the manhole 2 is activated to introduce the water present in the manhole 2 into the pipeline 1.

[0081] In this way, the end of the first pipeline 1A and the end of the second pipeline 1B can be connected within the manhole 2 using the bypass unit 3.

[0082] In this configuration, the overlapping portion between the end of the first pipeline 1A and the inlet bypass pipe 31A, and the overlapping portion between the end of the second pipeline 1B and the inner cylinder 32b of the expansion pipe 32 are sealed by the water-stopping device 4. Furthermore, the connection portion between the inlet bypass pipe 31A and the intermediate bypass pipe 31B, and the connection portion between the intermediate bypass pipe 31B and the outer cylinder 32a of the expansion pipe 32 are sealed by the water-stopping joint 33. In addition, the space between the outer cylinder 32a and the inner cylinder 32b of the expansion pipe 32 is sealed by the sealing rubber 34. As a result, the end of the first pipeline 1A and the end of the second pipeline 1B are connected within the manhole 2 in a sealed state by the bypass unit 3.

[0083] In this embodiment, the same effects and benefits as those of the embodiments shown in Figures 1 to 8 can be obtained.

[0084] (2) In the above embodiment, the number of bypass pipes in the bypass unit 3 can be three or more.

[0085] (3) In the above embodiment, although not shown, the water-stopping device 4 can be configured without, for example, the nozzle 42d, and the body 42a of the seal ring 42 can be formed solid, for example, although not shown. [Industrial applicability]

[0086] The present invention relates to a water-stopping device used in a bypass system construction method that installs bypass units in pipelines such as sewer pipes, and can be suitably used in the bypass system construction method. [Explanation of Symbols]

[0087] 1A 1st conduit 1B 2nd conduit 2 Manholes 3 Bypass Units 31 Bypass pipe 32 Telescopic tube 32a Outer cylinder 32b Inner cylinder 33. Water-stopping joint 34 Seal rubber 4. Water shutoff device 41 Seal Case 41a Cylindrical section 41b Annular plate portion 41c through hole 42 Seal rings 42a Body 42b Outerlip 42c Inner Lip 42d nozzle 42e aisle 42f wrench 42g nut 43 Anchor bolts 44 nuts 7 wires

Claims

1. A water-stopping device used in a bypass system construction method in which, when inspecting or repairing a manhole, the ends of the first and second pipelines are connected by a bypass unit, in a structure in which the ends of the first and second pipelines, which are installed horizontally underground, are connected so as to be open at opposing positions on the surrounding wall of a manhole, the ends of the first and second pipelines are connected by a bypass unit, It includes a seal case and a seal ring, The seal case comprises a cylindrical portion inserted at a distance from the inner diameter side of the end of the first conduit and the end of the second conduit, The annular plate portion extends radially outward from the inner end of the cylindrical portion to the inner end of the manhole and is fixed by mounting members to the inner surface of the manhole's peripheral wall near the end of the first pipeline and near the end of the second pipeline, The seal ring comprises a body that is fitted onto the outer circumference of the cylindrical portion of the seal case and contacts the inner surfaces of the ends of the first and second pipelines, In this body, an outer lip extends radially diagonally outward toward the outside of the manhole and is pressed against the inner circumferential surface of the end of the first pipeline and the end of the second pipeline, A water-stopping device characterized by having an inner lip that extends radially diagonally inward toward the outside of the manhole and is pressed against the outer surface of the pipe constituting the bypass unit.

2. In the water-stopping device according to claim 1, The body is formed to be hollow and expands when a fluid is supplied under pressure to the hollow portion, causing it to press against the outer surface of the cylindrical portion and the inner surfaces of the ends of the first and second pipelines. A water-stopping device further comprising a nozzle attached to the body and connected to a pressurizing device for supplying a fluid under pressure to the hollow portion of the body.

3. In a structure in which the ends of a first pipeline and a second pipeline, which are installed horizontally underground, are connected so as to be open at opposing positions on the surrounding wall of a manhole, a bypass system construction method is used to connect the ends of the first pipeline and the second pipeline with a bypass unit using a water-stopping device when inspecting or repairing the manhole, This includes pre-installation work for the water-stopping device and post-installation work for the bypass unit, The bypass unit comprises a bypass pipe, one end of which is inserted into the inner diameter side of the end of the first pipeline, and an expansion joint, one end of which is connected to the other end of the bypass pipe via a watertight joint, and the other end of which is inserted into the inner diameter side of the end of the second pipeline. The aforementioned water-stopping device comprises a seal case and a seal ring, The seal case comprises a cylindrical portion inserted at a distance from the inner diameter side of the end of the first conduit and the end of the second conduit, The annular plate portion extends radially outward from the inner end of the cylindrical portion to the inner end of the manhole and is fixed by mounting members to the inner surface of the manhole's peripheral wall near the end of the first pipeline and near the end of the second pipeline, The seal ring comprises a body fitted onto the outer circumference of the cylindrical portion of the seal case and in contact with the inner circumferential surfaces of the ends of the first and second pipelines; an outer lip extending radially outward toward the outside of the manhole and pressed against the inner circumferential surfaces of the ends of the first and second pipelines; and an inner lip extending radially inward toward the outside of the manhole and pressed against the outer circumferential surface of the pipe constituting the bypass unit. In the aforementioned preliminary work, the annular plate portion of the seal case is positioned on the inner surface of the manhole's peripheral wall so that it faces the region where the end of the first pipeline and the end of the second pipeline are located, and the seal case is fixed in place with its cylindrical portion inserted into the inner diameter side of the ends of the first pipeline and the end of the second pipeline; and the seal ring is fitted onto the outer circumference of the cylindrical portion of the seal case. The aforementioned post-operation involves connecting the outer casing of the expansion joint to the other end of the bypass pipe using the watertight joint, The process of inserting one end of the bypass pipe into the inner diameter side of the cylindrical portion of the seal case located at the end of the first conduit in a loose-fitting manner, A bypass system construction method characterized by the step of pulling out the inner cylinder of the expansion joint from the outer cylinder, thereby inserting the inner cylinder in a loose fit state into the inner diameter side of the cylindrical portion of the seal case located at the end of the second pipeline.

4. In the bypass system construction method described in claim 3, The body of the water-stopping device is formed to be hollow and expand when fluid is supplied under pressure to the hollow portion, causing it to press against the outer surface of the cylindrical portion and the inner surfaces of the ends of the first and second pipelines. The bypass system construction method is characterized in that the water-stopping device further has a nozzle attached to the body and to which a pressurizing device for pressurizing and supplying fluid to the hollow portion of the body is connected.

5. In the bypass system construction method described in claim 4, A bypass system construction method characterized by performing, as necessary, a step of supplying a fluid under pressure from the nozzle to the hollow portion of the body of the seal ring.

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