JP6222932B2 - Branch pipe, drainage pipe structure including the branch pipe, and branch pipe connection method - Google Patents

Description

  The present invention relates to a branch pipe, a drainage pipe structure including the branch pipe, and a branch pipe connection method.

  2. Description of the Related Art Conventionally, drainage pipe structures for flowing household wastewater and the like are known. This type of drainage piping structure is buried underground. This drainage pipe structure is composed of a mounting pipe connected to the drainage basin of each household and a main pipe that is connected to the mounting pipe and collects drainage from each household. The main pipe is provided with a gradient so that drainage flowing through the main pipe can flow easily. That is, the main pipe is arranged in the ground with an inclination that goes downward as it goes downstream.

  The attachment pipe of the drainage pipe structure and the main pipe are connected by a branch pipe. There are various types of the branch pipes, for example, the branch pipes described in Patent Document 1 or 2. Patent Document 1 discloses a 90 ° branch pipe including an arc-shaped skirt portion that covers the outer surface of a main pipe (sewer main pipe) and a receiving port that is formed to be orthogonal to the skirt section. On the other hand, Patent Document 2 discloses a branch pipe provided with a locking claw that is locked to the periphery of an opening of a main pipe (main pipe line).

Japanese Utility Model Publication No. 02-84094 JP 2007-154946 A

  By the way, due to ground changes caused by earthquakes, etc., the gradient of the main pipe of the drainage pipe structure disappears, or the gradient provided in the main pipe is reversed, that is, the main pipe slopes downward as it goes upstream. There is a risk of becoming. In addition, the main pipe of the drainage pipe structure may be damaged due to deterioration over time. At this time, since it becomes difficult for the drainage flowing through the main pipe to flow in the downstream direction, it is necessary to replace the main pipe of the drainage pipe structure already constructed with a new main pipe. In order to remove the existing main pipe that you want to replace from the ground, you must create a space on the main pipe by removing the earth and sand covered on the main pipe. In consideration of the cost and time required for the work, it is preferable that the space has a narrow width. That is, it is preferable that this space has a size slightly larger than that of the main pipe in plan view. The operator must replace the existing main with a new main in such a narrow space. As a procedure for replacing the existing main pipe with a new main pipe, first, a part of the existing mounting pipe is cut to separate the existing main pipe from the existing mounting pipe. Next, the existing main is removed from the space and a new main is installed in the space. Then, a new main pipe is attached to the existing mounting pipe through the branch pipe. Since this series of operations must be performed in a narrow space, the work space is limited. Therefore, when a 90 ° branch pipe as described in the conventional cited document 1 is to be attached to a new main pipe arranged in a narrow space, the connecting portion of the branch pipe with the existing attachment pipe is not in the space. Since it is located in the vicinity of the side surface, it is difficult to attach an existing mounting pipe to the branch pipe.

  The present invention has been made in view of such a point, and the purpose of the present invention is to provide a branch pipe that can easily connect a main pipe and a mounting pipe when replacing a main pipe that has already been constructed with a new main pipe. It is providing the connection method of the drain piping structure and branch pipe provided with.

  The branch pipe according to the present invention connects the main pipe and the mounting pipe. The branch pipe includes a flange plate having a hole and a tubular body. The tubular body includes a first opening connected to an outer peripheral portion of the hole of the flange plate, a second opening having an opening surface connected to the attachment pipe, the first opening, and the second opening. And a cylindrical portion formed in a cylindrical shape. The cross section of the flange plate has a shape along the circumferential direction of the main pipe. The axis of the second opening and the direction orthogonal to the cross section of the flange plate are substantially parallel.

  If wastewater flowing through the main pipe becomes difficult to flow in the downstream direction, it is necessary to replace the main pipe already constructed in the ground (hereinafter referred to as the existing main pipe) with a new main pipe. At this time, in order to take out the existing main pipe, it is necessary to create a space by removing the earth and sand on the main pipe. As described above, this space is slightly larger than the main pipe in plan view. It is preferable. After the existing main pipe is replaced with a new main pipe in such a space, when a 90 ° branch pipe as described in Patent Document 1 is connected to the new main pipe, the connection portion of the 90 ° branch pipe with the mounting pipe is changed. Since it is located near the side surface of the space, it is difficult to connect the 90 ° branch pipe to the mounting pipe. However, when the branch pipe of the present invention is connected to a new main pipe, the axis of the second opening of the branch pipe and the direction orthogonal to the cross section of the flange plate are substantially parallel, so the opening surface of the second opening of the branch pipe Is in the length direction of the main. Therefore, the opening surface of the 2nd opening part connected with a mounting pipe does not become a position which goes to the side surface of the said space. Therefore, the connection between the branch pipe and the attachment pipe is facilitated. Therefore, the work which replaces the existing main with a new main can be easily performed.

  According to a preferred aspect of the present invention, the cylindrical portion is curved.

  Thus, since the cylindrical part which connects a 1st opening part and a 2nd opening part is curving, the inside of a cylindrical part is smooth. Therefore, in the branch pipe of the present invention, drainage or the like flowing through the branch pipe can flow more easily than a branch pipe having a bent cylindrical portion. Moreover, since the cylindrical part of the branch pipe of the present invention is curved, the branch pipe is easily bent. Therefore, when the branch pipe is replaced, it can be removed from the main pipe or the like by utilizing the bending and connected to the main pipe or the like. In addition, when performing maintenance in the mounting pipe, branch pipe, and main pipe, a maintenance tool may be inserted into the mounting pipe, branch pipe, and main pipe to check the inside. At this time, since the cylindrical part of the branch pipe is curved, it is possible to prevent the maintenance tool from being caught in the branch pipe, and the insertion and removal of the maintenance tool is facilitated.

  According to another preferable aspect of the present invention, the second opening is located above the first opening. In a side view, the distance from the lower end of the flange plate to the axis of the second opening is longer than the distance from the opening surface of the second opening to the axis of the first opening.

  After replacing the existing main pipe with a new main pipe and connecting the new main pipe and the existing mounting pipe via the branch pipe, the new main pipe, the existing mounting pipe and the branch pipe are filled with earth and sand. At this time, in a side view, the distance from the lower end of the flange plate to the axis of the second opening is shorter than the distance from the opening surface of the second opening to the axis of the first opening, that is, the height of the branch pipe If the height is low, the space between the second opening of the branch pipe and the main pipe becomes narrow, so that it is difficult to fill the space with earth and sand. When the work is completed in a state where there is the space, the main pipe, the mounting pipe, and the branch pipe may be damaged due to a load applied from above the branch pipe. However, like the branch pipe of the present invention, in a side view, the distance from the lower end of the flange plate to the axis of the second opening is longer than the distance from the opening surface of the second opening to the axis of the first opening. In other words, by increasing the height of the branch pipe, the space between the second opening of the branch pipe and the main pipe is widened, so that it is easy to bury earth or the like in the space. This eliminates the space and prevents the main pipe, the mounting pipe, and the branch pipe from being damaged by a load applied from above the branch pipe. This also makes it difficult for the ground to collapse.

  The drainage pipe structure of the present invention is arranged so as to incline downward toward any of the above-mentioned branch pipes, and is arranged along the lower surface of the flange plate of the branch pipe, and is connected to the hole of the flange plate. A main pipe in which a hole is formed; and a mounting pipe connected to the main pipe through the branch pipe.

  By this, the drainage piping structure using the branch pipe of the present invention can be provided.

  According to a preferred aspect of the present invention, the axis of the main pipe is located between the center of the second opening of the branch pipe and the center of the end face of the attachment pipe in plan view.

  In plan view, when the main pipe is at the center, the space opposite to the side where the mounting pipe is located is free from the mounting pipe, so that a working space is secured. Therefore, a branch pipe can be easily connected to the main pipe using this space.

  According to another preferred aspect of the present invention, the axis of the second opening and the axis of the main pipe are substantially parallel.

  Thus, since the axis of the second opening of the branch pipe and the axis of the main pipe are substantially parallel, the opening surface of the second opening of the branch pipe faces the length direction of the main pipe. Therefore, the opening surface of the second opening of the branch pipe is not positioned so as to face the side surface of the space in the space for taking out the existing main pipe described above. Therefore, the connection between the branch pipe and the attachment pipe is facilitated. Therefore, when the existing main pipe is replaced with a new main pipe, the connection between the branch pipe and the mounting pipe after the main pipe and the branch pipe are connected is facilitated.

  According to another preferable aspect of the present invention, the drainage pipe structure includes a cylindrical joint that connects the second opening of the branch pipe and the attachment pipe. The joint connects the branch pipe side opening connected to the second opening of the branch pipe, the attachment pipe side opening connected to the attachment pipe, and the branch pipe side opening and the attachment pipe side opening. A joint tubular portion.

  Conventionally, the attachment shaft and the conventional branch pipe are connected via the spear-type joining member because the attachment shaft of the attachment pipe and the receiving shaft of the conventional branch pipe substantially coincide with each other. This spear-type joining member is a conventionally known member. Since the spear-type joining member is a special member, in order to use the spear-type joining member, it is necessary to secure a working space, and it is not easy to connect the attachment pipe and the conventional branch pipe. However, in the present invention, the opening surface of the second opening of the branch pipe faces the length direction of the main pipe, so that the axis of the attachment pipe and the axis of the second opening of the branch pipe do not coincide with each other. Therefore, the joint of the present invention can be used without using the spear-type joining member. As a result, it is easier to connect the attachment pipe and the branch pipe than in the prior art.

  The branch pipe connection method of the present invention is a method of connecting the main pipe and the attachment pipe using any of the branch pipes described above. In this branch pipe connection method, the step of removing earth and sand on the existing main pipe, the step of separating a part of the attachment pipe connected to the existing main pipe from the existing main pipe, and the existing book Removing the pipe, placing a new main pipe, placing the lower surface of the flange plate of the branch pipe in the hole formed in the new main pipe, and forming the second opening of the branch pipe in a cylindrical shape. Connecting the joint and connecting the joint and the mounting pipe.

  As a result, it is possible to provide a branch pipe connection method that can replace the existing main pipe with a new main pipe and easily connect the new main pipe and the existing mounting pipe via the branch pipe of the present invention. .

  The present invention provides a branch pipe that can easily connect a main pipe and a mounting pipe when replacing a main pipe that has already been constructed with a new main pipe, a drainage pipe structure provided with the branch pipe, and a method of connecting the branch pipe can do.

It is a side view which shows the drain piping structure which concerns on embodiment. It is a schematic diagram which shows a state when a main pipe is embed | buried in the ground. It is a figure which shows the state of the connection of a branch pipe, a main pipe, and an attachment pipe, and is the elements on larger scale of FIG. It is a side view of the branch pipe which shows the state which has arranged the branch pipe in the main pipe. It is a front view of a branch pipe. It is a bottom view of a branch pipe. It is a side view of a joint. It is a figure which shows the procedure which replaces the existing main with a new main. It is a figure which shows the procedure which replaces the existing main with a new main. It is a figure which shows the procedure which replaces the existing main with a new main. It is a figure which shows the procedure which replaces the existing main with a new main. It is a side view of the branch pipe concerning the 1st modification. It is a side view of the branch pipe concerning the 2nd modification.

  Hereinafter, preferred embodiments of the present invention will be described. Note that matters other than matters specifically mentioned in the present specification and necessary for the implementation of the present invention can be grasped as design matters of those skilled in the art based on the prior art in the field. The present invention can be carried out based on the contents disclosed in the present specification and common general technical knowledge in the field.

<Embodiment>
FIG. 1 is a side view showing a drain piping structure 1 according to the present embodiment. Reference GL indicates the ground surface. Moreover, let the right side and the left side in FIG. 1 be the right side and the left side of the drain piping structure 1, respectively. As shown in FIG. 1, the drainage pipe structure 1 is a structure of a pipe that is buried in the ground and allows the drainage of each household to flow. The drainage pipe structure 1 includes a main pipe 10, a branch pipe 30 connected to the main pipe 10, a joint 80 connected to the branch pipe 30, and a mounting pipe 15 connected to the main pipe 10 via the branch pipe 30 and the joint 80. And a mast 25 connected to the mounting tube 15.

  The 25th is the so-called public square. First, an inlet 26 and an outlet 27 are formed at 25. The outlet 27 is formed at a position lower than the inlet 26. In the present embodiment, an outlet 27 is formed at a position facing the inlet 26. The inflow port 26 is connected to the downstream end of the inflow pipe 22, and the outflow port 27 is connected to the upstream end of the outflow pipe 23. The inflow pipe 22 is a pipe that guides domestic wastewater or the like toward the main body 25. The outflow pipe 23 is a pipe that discharges drainage or the like from 25 toward the attachment pipe 15 and the main pipe 10. An attachment pipe 15 is connected to the downstream end of the outflow pipe 23.

  The attachment pipe 15 is a pipe for guiding drainage flowing from the outflow pipe 23 to the main pipe 10. In the present embodiment, the attachment tube 15 has a straight cylindrical shape. However, the attachment tube 15 may have a curved tube shape that is partially bent. The attachment pipe 15 is disposed so as to be inclined downward toward the downstream side. Therefore, the downstream end 17 of the attachment pipe 15 is located below the upstream end 16 of the attachment pipe 15. An outflow pipe 23 is connected to the upstream end 16 of the attachment pipe 15. In the present embodiment, the outflow pipe 23 is fitted inside the upstream end 16 of the attachment pipe 15. The main pipe 10 is connected to the downstream end 17 of the attachment pipe 15 through a joint 80 and a branch pipe 30.

  The main pipe 10 is a pipe for collecting drainage and the like flowing from the attachment pipe 15. In FIG. 1, one attachment pipe 15 is connected to the main pipe 10, but a plurality of attachment pipes 15 are actually connected to the main pipe 10. The main pipe 10 is disposed below the attachment pipe 15. That is, the main pipe 10 is disposed deeper in the ground than the mounting pipe 15.

  The main pipe 10 is disposed so as to be inclined downward toward the downstream side. FIG. 2 is a schematic diagram showing a state when the main pipe 10 is buried in the ground. In FIG. 2, the left side indicates upstream and the right side indicates downstream. As shown in FIG. 2, the main pipe 10 is disposed so as to incline to the lower right. In the present embodiment, the main pipe 10 has a straight cylindrical shape and has a circular cross section. However, the shape of the main pipe 10 is not particularly limited. A hole 12 is formed in the main pipe 10. The hole 12 is a hole for guiding drainage flowing from the attachment pipe 15 into the main pipe 10. Although the shape of the hole 12 of the main pipe 10 is not particularly limited, in the present embodiment, the hole 12 is circular.

  Next, the branch pipe 30 according to the present embodiment will be described. 3 is a view showing a connection state of the branch pipe 30, the main pipe 10, and the attachment pipe 15, and is a partially enlarged view of FIG. FIG. 4 is a side view of the branch pipe 30 showing a state in which the branch pipe 30 is arranged on the main pipe 10. FIG. 5 is a front view of the branch pipe 30. FIG. 6 is a bottom view of the branch pipe 30.

  As shown in FIG. 3, the main pipe 10 and the attachment pipe 15 are arranged at positions separated from each other. The branch pipe 30 connects the main pipe 10 and the attachment pipe 15, and plays a role of introducing drainage flowing from the attachment pipe 15 into the main pipe 10. The branch pipe 30 is a pipe connecting the main pipe 10 and the attachment pipe 15. As shown in FIG. 4, the branch pipe 30 includes a flange plate 60 and a tubular body 40.

  The flange plate 60 is a plate disposed on the main pipe 10. The lower surface 61 of the flange plate 60 is in contact with the main pipe 10. The flange plate 60 is arranged on the main pipe 10 along the outer peripheral surface of the main pipe 10. In the present embodiment, as shown in FIG. 3, the flange plate 60 is disposed in the main pipe 10 such that a part of the flange plate 60 is positioned above the center C <b> 1 of the main pipe 10. Specifically, the flange plate 60 of the branch pipe 30 is an angle formed by a center line E1 passing through the center of the flange plate 60 in the circumferential direction A1 and the center C1 of the main pipe 10 and a vertical line E2 passing through the center C1 of the main pipe 10. Is arranged in the main pipe 10 so as to have a predetermined angle R. The branch pipe 30 is preferably attached to the main pipe 10 at 120 ° with the vertical line E2 passing through the center C1 of the main pipe 10 as the pipe top. Therefore, the angle R is preferably an angle between 120 ° with the vertical line E2 being the top of the tube. For example, it is 0 ° to 60 °. The reason why the flange plate 60 is disposed on the main pipe 10 within such a range is to reliably prevent the drainage or the like flowing in the main pipe 10 from flowing back to the mounting pipe 15 via the branch pipe 30. . Further, the flange plate 60 of the branch pipe 30 may be disposed right above the main pipe 10 (R = 0 °). However, if the branch pipe 30 is disposed immediately above the main pipe 10, the distance between the branch pipe 30 connected to the main pipe 10 and the downstream end 17 of the attachment pipe 15 is shortened, so that it is difficult to secure a work space. Therefore, the flange plate 60 of the branch pipe 30 is disposed at a position slightly inclined from directly above the main pipe 10, thereby increasing the distance between the branch pipe 30 and the downstream end 17 of the mounting pipe 15 as much as possible to ensure a working space. It is preferable to do. In the present embodiment, the flange plate 60 is disposed so as to cover a part of the main pipe 10. However, the range covered by the flange plate 60 of the main pipe 10 is not particularly limited.

  The cross section of the flange plate 60 has a shape along the circumferential direction A1 of the main pipe 10. In the present embodiment, since the main pipe 10 has a circular cross section, the flange plate 60 is formed in an arc shape along the main pipe 10 in the cross-sectional shape (lateral cross-sectional shape) in the circumferential direction A1. The cross section of the flange plate 60 is C-shaped. The flange plate 60 is curved so as to be concave downward. In this way, the flange plate 60 only needs to be formed in a shape that follows the shape of the main pipe 10. For example, if the main pipe 10 has a quadrangular cross section, the flange plate 60 has a cross section in the circumferential direction A <b> 1. The shape (cross-sectional shape) is formed in a shape having corners so as to follow the main pipe 10. As shown in FIG. 6, the flange plate 60 according to the present embodiment has a quadrangular shape when viewed from the direction of the center line E1 (see FIG. 3). However, the shape of the flange plate 60 is not particularly limited. For example, the flange plate 60 may be circular when viewed from the direction of the center line E1. As shown in FIG. 4, the flange plate 60 has a side end portion 64 along the circumferential direction A1.

  As shown in FIG. 6, holes 62 are formed in the flange plate 60. When the flange plate 60 of the branch pipe 30 is disposed in the main pipe 10, the hole 62 of the flange plate 60 is connected to the hole 12 (see FIG. 2) of the main pipe 10. That is, when the branch pipe 30 is disposed in the main pipe 10, the hole 62 of the flange plate 60 and the hole 12 of the main pipe 10 overlap. In the present embodiment, a hole 62 is formed in the central portion of the flange plate 60. However, the position where the hole 62 is formed is not particularly limited. For example, the position of the hole 62 may be the right side portion or the left side portion of the flange plate 60. In the present embodiment, the hole 62 of the flange plate 60 is circular. However, the shape of the hole 62 is not particularly limited, and the hole 62 may be elliptical. The shape of the hole 62 of the flange plate 60 is preferably the same shape as the hole 12 of the main pipe 10.

  Further, an annular convex portion 63 is formed on the lower surface 61 of the flange plate 60. The annular convex portion 63 is formed on the lower surface 61 of the flange plate 60 so as to be along the outer periphery of the hole 62 of the flange plate 60. The annular protrusion 63 is fitted into the hole 12 of the main pipe 10 when the branch pipe 30 is connected to the main pipe 10. Therefore, when connecting the branch pipe 30 to the main pipe 10, the annular protrusion 63 makes it easy to position the branch pipe 30 in the main pipe 10. In the present embodiment, the size of the hole 62 of the flange plate 60 is smaller than that of the hole 12 of the main pipe 10. The annular protrusion 63 may be formed in the main pipe 10 along the outer periphery of the hole 12 of the main pipe 10. In this case, since the annular protrusion 63 is fitted into the hole 62 of the flange plate 60, the size of the hole 62 of the flange plate 60 is larger than the hole 12 of the main pipe 10.

  In addition, the method of attaching the flange plate 60 of the branch pipe 30 and the main pipe 10 is not particularly limited, and can be attached by a conventionally known method. For example, the hole 12 is formed at a predetermined position of the main pipe 10 using a horuseau or the like. And the branch pipe 30 can be arrange | positioned in the main pipe 10 so that the hole 62 of the branch pipe 30 may overlap with the hole 12 of the main pipe 10, and the main pipe 10 and the branch pipe 30 can be attached using a joining material and a number wire.

  The tubular body 40 of the branch pipe 30 is a conduit through which drainage or the like flows. As shown in FIG. 4, the tubular body 40 is located above the flange plate 60 in the side view of the branch pipe 30. Further, as shown in FIG. 1, in the drainage piping structure 1, the tubular body 40 is located on the upper right side of the main pipe 10. In the present embodiment, the tubular body 40 and the flange plate 60 are integrally formed. The tubular body 40 includes a first opening 50, a second opening 55, and a tubular portion 43.

  The first opening 50 is connected to the flange plate 60. Specifically, as shown in FIG. 6, the first opening 50 is connected to the outer peripheral portion of the hole 62 of the flange plate 60. The first opening 50 rises from the outer peripheral portion of the hole 62 of the flange plate 60. As shown in FIG. 4, the first opening 50 is located above the flange plate 60. In the present embodiment, the first opening 50 is orthogonal to the direction B1 orthogonal to the circumferential direction A1 of the flange plate 60. That is, the axis L1 of the first opening 50 and the direction B1 orthogonal to the circumferential direction A1 of the flange plate 60 are orthogonal to each other. The axis L1 of the first opening 50 is orthogonal to the length direction of the main pipe 10. That is, the axis L1 of the first opening 50 is orthogonal to the axis L3 of the main pipe 10. In the present embodiment, the opening size of the first opening 50 is the same size as the hole 62 of the flange plate 60. However, the size of the opening of the first opening 50 may be smaller or larger than the hole 62 of the flange plate 60.

  The second opening 55 is connected to the attachment pipe 15 via the joint 80. In the present embodiment, as shown in FIG. 3, since the attachment pipe 15 is located above the main pipe 10, the second opening 55 is located above the first opening 50 connected to the main pipe 10. doing. The second opening 55 is located above the flange plate 60. As shown in FIG. 5, the second opening 55 has an opening surface 57.

  As shown in FIG. 4, the axis L2 of the second opening 55 and the direction B1 orthogonal to the circumferential direction A1 of the flange plate 60 are substantially parallel. The axis L2 of the second opening 55 and the direction B1 orthogonal to the cross section of the flange plate 60 are substantially parallel. That is, the axis L2 of the second opening 55 and the axis L3 of the main pipe 10 are substantially parallel. In other words, the axis L2 of the second opening 55 and the length direction of the main pipe 10 are substantially parallel. In the present embodiment, the axis L2 of the second opening 55 and the axis L1 of the first opening 50 are substantially orthogonal. The virtual surface VD2 including the opening surface 57 of the second opening 55 and the direction B1 orthogonal to the circumferential direction A1 of the flange plate 60 are substantially orthogonal. Further, in a side view of the branch pipe 30, a distance D <b> 1 from the lower end portion 65 of the flange plate 60 to the axis L <b> 2 of the second opening 55 is from the opening surface 57 of the second opening 55 to the axis L <b> 1 of the first opening 50. Longer than the distance D2. In the present embodiment, the opening surface 57 of the second opening 55 and the side end portion 64 of the flange plate 60 are substantially parallel. That is, the virtual surface VD2 including the opening surface 57 of the second opening 55 and the virtual surface VD1 parallel to the circumferential direction A1 of the flange plate 60 are substantially parallel. The opening surface 57 of the branch pipe 30 is substantially parallel to the cross section of the main pipe 10.

  The cylindrical portion 43 connects the first opening 50 and the second opening 55. Therefore, one end of the cylindrical portion 43 is connected to the first opening 50, and the other end of the cylindrical portion 43 is connected to the second opening 55. The cylindrical part 43 is formed in a cylindrical shape. In this embodiment, the cross section of the cylindrical part 43 is circular. However, the shape of the cross section of the cylindrical portion 43 is not particularly limited. Moreover, the cylindrical part 43 is bent. Specifically, the cylindrical portion 43 is curved. In other words, the axis of the cylindrical portion 43 is a curve. In the present embodiment, the entire tubular portion 43 is curved 90 degrees, and the curved portion is one location.

  In the present embodiment, the tubular body 40 is integrally formed. That is, the cylindrical portion 43, the first opening portion 50, and the second opening portion 55 of the tubular body 40 are integrally formed. However, the tubular portion 43, the first opening portion 50, and the second opening portion 55 of the tubular body 40 may be formed separately, or the tubular portion 43, the first opening portion 50, and the first opening portion. Only a part of the two openings 55 may be integrally formed.

  As shown in FIG. 3, the joint 80 according to the present embodiment is connected to the branch pipe 30 and the attachment pipe 15. Specifically, the joint 80 connects the second opening 55 of the branch pipe 30 and the attachment pipe 15. The joint 80 is cylindrical. FIG. 7 is a side view of the joint 80 of the present embodiment, and is a view seen from the lower left of FIG. As shown in FIG. 7, the joint 80 includes a branch pipe side opening 82, an attachment pipe side opening 84, and a joint cylindrical part 86.

  The branch pipe side opening 82 is connected to the second opening 55 of the branch pipe 30. In the present embodiment, the branch pipe 30 and the joint 80 are connected by fitting the branch pipe side opening 82 of the joint 80 inside the second opening 55 of the branch pipe 30. In the present embodiment, the second opening 55 of the branch pipe 30 is a receiving port, and the branch side opening 82 of the joint 80 is a differential port. Therefore, the size of the opening of the branch side opening 82 of the joint 80 is smaller than the size of the opening of the second opening 55 of the branch 30. The method of connecting the branch side opening 82 of the joint 80 and the second opening 55 of the branch 30 is not particularly limited, and the second opening 55 of the branch 30 is provided inside the branch side opening 82 of the joint 80. You may make it fit. In other words, the second opening 55 of the branch pipe 30 may be an outlet, and the branch side opening 82 of the joint 80 may be a receptacle.

  The attachment pipe side opening 84 is connected to the attachment pipe 15. Specifically, the attachment pipe side opening 84 is connected to the downstream end 17 of the attachment pipe 15. In this embodiment, the joint 80 and the attachment pipe 15 are connected by fitting the downstream end 17 of the attachment pipe 15 inside the attachment pipe side opening 84 of the joint 80. In the present embodiment, the attachment tube side opening 84 of the joint 80 is a receiving port, and the downstream end 17 of the attachment tube 15 is an insertion port. Therefore, the opening size of the attachment pipe side opening 84 of the joint 80 is larger than the opening size of the downstream end 17 of the attachment pipe 15. The method for connecting the attachment pipe side opening 84 of the joint 80 and the downstream end 17 of the attachment pipe 15 is not particularly limited, and the attachment pipe side opening 84 of the joint 80 is provided inside the downstream end 17 of the attachment pipe 15. You may make it fit. In other words, the attachment pipe side opening 84 of the joint 80 is an outlet, and the downstream end 17 of the attachment pipe 15 is a receptacle.

  The joint tubular portion 86 is connected to the branch pipe side opening 82 and the attachment pipe side opening 84. A part of the joint tubular portion 86 is bent. In the present embodiment, a part of the joint tubular portion 86 is curved. However, as long as the joint cylindrical part 86 connects the branch pipe side opening 82 and the attachment pipe side opening 84, the joint cylindrical part 86 may be a straight cylinder, or a part thereof is bent. May be. In the present embodiment, the joint cylindrical portion 86 has a circular cross section.

  In the present embodiment, the main pipe 10, the attachment pipe 15, the branch pipe 30, and the joint 80 are made of resin. That is, the tubular body 40 and the flange plate 60 of the branch pipe 30 are made of resin, and the tubular portion 43, the first opening 50, and the second opening 55 of the tubular body 40 are made of resin, and the branch-side opening of the joint 80 is formed. The part 82, the attachment pipe side opening 84 and the joint cylindrical part 86 are made of resin. However, the main pipe 10, the attachment pipe 15, the branch pipe 30, and the joint 80 may be made of a material other than resin, or only a part thereof may be made of resin.

  Next, in the drainage piping structure 1 of this embodiment, the flow of drainage will be briefly described. First, as shown in FIG. 1, the waste water flowing from the home is introduced into 25 through the inflow pipe 22. Thereafter, the drainage flows to the outflow pipe 23 connected to the main body 25. After the drainage flows through the outflow pipe 23, the drainage is introduced into the attachment pipe 15 connected to the outflow pipe 23. Since the attachment pipe 15 is disposed so as to be inclined toward the downstream side, the drainage introduced into the attachment pipe 15 flows from the upstream end 16 to the downstream end 17 of the attachment pipe 15. Then, the drainage that has flowed to the downstream end 17 of the attachment pipe 15 is introduced into the main pipe 10 via the joint 80 and the branch pipe 30. The waste water introduced into the main pipe 10 flows from the upstream side of the main pipe 10 to the downstream side (right side in FIG. 2) because the main pipe 10 is arranged so as to be inclined toward the downstream side. .

  By the way, the main pipe of the drainage pipe structure buried in the ground is provided with a gradient when buried, but due to ground fluctuations caused by earthquakes, etc., the gradient of the main pipe disappears or the gradient provided in the main pipe is reversed. In other words, there is a risk that the main slope is directed downward as it goes upstream. In addition, the existing main pipe may be damaged due to deterioration over time. As a result, it is considered that the drainage or the like flowing in the existing main pipe becomes difficult to flow from the upstream to the downstream, or the drainage or the like flows backward from the downstream to the upstream of the existing main pipe. In such a case, it is necessary to replace the existing main with a new main. As a method of replacing the main pipe, first, a space is formed on the existing main pipe to be replaced by removing earth and sand on the existing main pipe to be replaced. Then, a part of the existing installation pipe is disconnected from the existing main pipe, and the existing main pipe is replaced with a new main pipe. At this time, it is necessary to connect a new main pipe and an existing mounting pipe. Therefore, when connecting a new main pipe and an existing mounting pipe, the branch pipe of the present invention is used.

  Next, a method of connecting a new main pipe and an existing mounting pipe using the branch pipe 30 according to the present embodiment when the existing main pipe is replaced with a new main pipe will be described. 8 to 11 are diagrams showing a procedure for replacing the existing main 110 with the new main 120. 8 to 11 show only the existing main pipe 110 or the new main pipe 120 to be replaced, but actually a plurality of main pipes are connected in the longitudinal direction of the main pipe. The new main 120 is similar to the main 10 described above.

  First, the process of removing the earth and sand on the existing main pipe 110 is performed. As shown in FIG. 8, the earth and sand on the existing main pipe 110 to be replaced are removed to form a space S. The space S is preferably a space having a width that is slightly wider than the existing main pipe 110 that is desired to be replaced in plan view in consideration of the time required for the work and the cost required for the work. For example, the width W of the space S is about 1,000 mm. Specifically, the spaces S each have a width of about 500 mm in the radial direction (left-right direction in FIG. 8) from the axis of the existing main pipe 110. The existing main pipe 110 is connected to an existing mounting pipe 115 via a 90 ° branch pipe 130 as described in the conventional cited document 1. The existing attachment tube 115 is the same as the attachment tube 15 described above.

  After removing the earth and sand on the existing main pipe 110 to be replaced, a step of separating a part of the existing mounting pipe 115 from the existing main pipe 110 in order to take the existing main pipe 110 to be replaced to the ground. I do. In this step, a part of the existing attachment tube 115 in the space S is cut, but the cutting method is not particularly limited, and may be cut by a conventionally known method. In the present embodiment, the existing attachment tube 115 is cut at the position P.

  Next, the existing main 110 to be replaced is removed, and a new main 120 is arranged as shown in FIG. In this step, first, the existing main pipe 110 to be replaced is taken out from the space S to the ground. At this time, the 90 ° branch pipe 130 remains connected to the removed main pipe 110. Therefore, the 90 ° branch pipe 130 is also replaced with a new branch pipe. Next, the hole 12 is formed in the new main pipe 120 using a horuseau or the like. The location where the hole 12 is formed is not particularly limited, and the shape of the branch pipe 30 and the joint 80 is taken into consideration, and it is assumed that the new main pipe 120 and the existing mounting pipe 115 are connected via the joint 80 and the branch pipe 30. Thus, the location of the main pipe 10 where the hole 12 is formed is determined. Then, after removing the existing main pipe 110, a new main pipe 120 is arranged in the space S. At this time, the new main pipe 120 is arranged in the space S so that the hole 12 formed in the new main pipe 120 is directed above the axis of the new main pipe 120. That is, the new main pipe 120 is disposed in the space S so that the hole 12 can be seen in plan view.

  Next, as shown in FIG. 10, a step of placing the branch pipe 30 of the present embodiment on a new main pipe 120 is performed. In this step, the lower surface 61 of the flange plate 60 of the branch pipe 30 of this embodiment is connected around the hole 12 of the new main pipe 120. At this time, the hole 12 (see FIG. 9) of the new main pipe 120 and the hole 62 (see FIG. 6) of the flange plate 60 of the branch pipe 30 overlap. In addition, the method of attaching the branch pipe 30 and the new main pipe 120 is not specifically limited, It can attach by the conventionally well-known method as mentioned above. For example, the new main pipe 120 and the branch pipe 30 can be attached using a bonding material and a wire.

  In the present embodiment, as shown in FIG. 10, there is a gap between the branch pipe 30 and the existing attachment pipe 115. That is, the axis L3 of the new main pipe 120 is located between the center of the second opening 55 of the branch pipe 30 and the center C2 of the end face of the existing mounting pipe 115 in plan view. In this state, the branch pipe 30 and the existing attachment pipe 115 cannot be connected. Therefore, as shown in FIG. 11, the branch pipe 30 and the existing attachment pipe 115 are connected via a joint 80. Here, a process of connecting the joint 80 to the branch pipe 30 and connecting the joint 80 and the existing mounting pipe 115 is performed. In this step, first, the joint 80 is connected to the branch pipe 30 disposed in the new main pipe 120. Specifically, the second opening 55 of the branch pipe 30 and the branch side opening 82 of the joint 80 are connected. In the present embodiment, the branch pipe 30 and the joint 80 are connected by fitting the branch side opening 82 of the joint 80 inside the second opening 55 of the branch pipe 30.

  After connecting the branch pipe 30 and the joint 80, the joint 80 and the existing mounting pipe 115 are connected. Specifically, the attachment pipe side opening 84 of the joint 80 is connected to the downstream end of the existing attachment pipe 115 (the end located at the position P where the existing attachment pipe 115 is cut). In the present embodiment, the joint 80 and the existing attachment pipe 115 are connected by fitting the downstream end of the existing attachment pipe 115 inside the attachment pipe side opening 84 of the joint 80. By such a procedure, the new main pipe 120 and the existing mounting pipe 115 are connected.

  Finally, earth and sand are put on the new main pipe 120, the existing attachment pipe 115, the branch pipe 30 and the joint 80 to fill the space S. The above is a method of connecting the new main pipe 120 and the existing mounting pipe 115 using the branch pipe 30 in the present embodiment when the existing main pipe 110 is replaced with the new main pipe 120.

  In this embodiment, when the new main pipe 120 and the existing mounting pipe 115 are connected, the new main pipe 120 and the branch pipe 30 are connected, the branch pipe 30 and the joint 80 are connected, and finally the joint 80 and the existing pipe are connected. However, the connecting procedure is not particularly limited. Although not shown, the joint 80 may be connected to the existing mounting pipe 115, the joint 80 may be connected to the branch pipe 30, and finally the new main pipe 120 may be connected to the branch pipe 30. Further, after connecting the joint 80 to the existing mounting pipe 115, the new main pipe 120 and the branch pipe 30 may be connected, and then the branch pipe 30 and the joint 80 may be connected. In the case of this procedure, the position of the branch side opening 82 of the joint 80 can be specified in advance, so that the position of the branch pipe 30 and the position of the hole 12 of the new main pipe 120 can be easily determined. Therefore, the new main pipe 120 and the existing mounting pipe 115 can be connected without using a member such as a new joint.

  In the present embodiment, as shown in FIG. 4, the axis L2 of the second opening 55 of the branch pipe 30 and the direction B1 orthogonal to the transverse section (circumferential direction A1) of the flange plate 60 are substantially parallel. The axis L2 of the second opening 55 of the branch pipe 30 and the axis L3 of the main pipe 10 are substantially parallel. As shown in FIG. 8, when replacing the existing main pipe 110 with a new main pipe 120 (see FIG. 10), in order to take out the existing main pipe 110, the earth and sand etc. on the existing main pipe 110 are removed and the space S is removed. The space S is preferably slightly larger (width W) than the existing main pipe 110 in plan view. After the existing main pipe 110 is replaced with the new main pipe 120 in the space S, the existing 90 ° branch pipe 130 (see FIG. 8) is connected to the new main pipe 120. Since the connection part with 115 is located near the side surface of the space S, it is difficult to connect the 90 ° branch pipe 130 to the existing attachment pipe 115. However, when the branch pipe 30 of this embodiment is connected to the new main pipe 120, the second opening 55 of the branch pipe 30 and the axis L3 (see FIG. 4) of the main pipe 10 (new main pipe 120) are substantially parallel. Therefore, as shown in FIG. 10, the opening surface 57 of the branch pipe 30 faces the length direction of the new main pipe 120. Therefore, the opening surface 57 of the second opening 55 connected to the existing attachment pipe 115 is not positioned so as to face the side surface of the space S. In the present embodiment, the opening surface 57 of the branch pipe 30 is 90 degrees with respect to the side surface of the space S. Therefore, the connection between the branch pipe 30 and the existing attachment pipe 115 becomes easy. Therefore, the operation of connecting the existing mounting pipe 115 to the new main pipe 120 can be easily performed.

  Moreover, in this embodiment, as shown in FIG. 4, the cylindrical part 43 which connects the 1st opening part 50 and the 2nd opening part 55 of the branch pipe 30 is curving. Thereby, the inside of the cylindrical part 43 is smooth. Therefore, the branch pipe 30 according to the present embodiment is easier to flow the drainage flowing through the branch pipe than the branch pipe having the bent cylindrical portion. Moreover, since the cylindrical part 43 of the branch pipe 30 is curved, it is easy to bend. Therefore, when the branch pipe 30 is replaced, it is possible to easily remove the branch pipe 30 from the main pipe 10 or the like and connect the branch pipe 30 to the main pipe 10 or the like by using the bending. In addition, when performing maintenance management in the mounting pipe 15, the branch pipe 30, and the main pipe 10, a maintenance management tool such as a camera is inserted from 25 (see FIG. 1) so that the mounting pipe 15, the branch pipe 30, the main pipe 10, etc. The inside may be checked. At this time, since the cylindrical portion 43 of the branch pipe 30 is curved, the maintenance tool can be prevented from being caught in the branch pipe 30, and the maintenance tool can be easily inserted and removed.

  In the present embodiment, in a side view of the branch pipe 30, the distance D <b> 1 from the lower end portion 65 of the flange plate 60 of the branch pipe 30 to the axis L <b> 2 of the second opening 55 is from the opening surface 57 of the second opening 55 of the branch pipe 30. It is longer than the distance D2 to the axis L1 of the first opening 50. As shown in FIG. 11, after replacing the existing main pipe 110 with a new main pipe 120 and connecting the new main pipe 120 and the existing mounting pipe 115 via the branch pipe 30, the new main pipe 120 and the existing mounting pipe are connected. 115 and the branch pipe 30 are filled with earth and sand. At this time, as shown in FIG. 4, in a side view of the branch pipe 30, a distance D <b> 1 from the lower end portion 65 of the flange plate 60 in the branch pipe 30 to the axis L <b> 2 of the second opening 55 is the second opening 55 of the branch pipe 30. When the distance D2 is shorter than the distance D2 from the opening surface 57 of the first opening 50 to the axis L1 of the first opening 50, the space between the second opening 55 of the branch pipe 30 and the new main pipe 120 becomes narrow. Is hard to fill. If the earth and sand are not buried in the space, the new main pipe 120 and the branch pipe 30 may be damaged due to a load applied from above the branch pipe 30. However, the distance D1 from the lower end 65 of the flange plate 60 to the axis L2 of the second opening 55 from the opening surface 57 of the second opening 55 in the side view of the branch 30 as in the branch 30 of the present embodiment. By making it longer than the distance D2 to the axis L1 of the first opening 50, the space between the second opening 55 of the branch pipe 30 and the new main pipe 120 becomes wider, so that earth or the like is buried in the space. Becomes easier. As a result, it is possible to prevent the new main pipe 120 and the branch pipe 30 from being damaged by a load applied from above the branch pipe 30. Moreover, it can prevent suitably that the ground depression occurs.

  In the present embodiment, the opening surface 57 of the second opening 55 of the branch pipe 30 and the side end portion 64 of the flange plate 60 are substantially parallel. That is, the opening surface 57 of the branch pipe 30 is substantially parallel to the cross section of the main pipe 10. Accordingly, as shown in FIG. 10, the opening surface 57 of the branch pipe 30 is not positioned so as to face the side surface of the space S. Therefore, the branch pipe 30 and the existing attachment pipe 115 can be easily connected in the space S. Can be connected.

  In the present embodiment, the flange plate 60 and the tubular body 40 of the branch pipe 30 are integrally formed. There is no seam between the flange plate 60 and the tubular body 40. By this, it can prevent more reliably that the waste_water | drain etc. which flow into the inside of the branch pipe 30 leak outside.

  In the present embodiment, as shown in FIG. 10, the new main pipe 120 between the center of the second opening 55 of the branch pipe 30 and the center of the end face of the existing mounting pipe 115 (the mounting pipe 15) in plan view. The axis L3 of (main pipe 10) is located. In plan view, when the new main pipe 120 is the center, the space on the opposite side to the side where the existing mounting pipe 115 is located has no working space because the existing mounting pipe 115 is not located. Yes. Therefore, the branch pipe 30 can be easily connected to the new main pipe 120 using the space.

  In the present embodiment, as shown in FIG. 7, the drainage pipe structure 1 includes a cylindrical joint 80 that connects the second opening 55 of the branch pipe 30 and the attachment pipe 15. The joint 80 includes a branch pipe side opening 82 connected to the second opening 55 of the branch pipe 30, an attachment pipe side opening 84 connected to the attachment pipe 15, a branch pipe side opening 82, and the attachment pipe side opening 84. And a joint tubular portion 86 that connects the two. Conventionally, the attachment shaft 15 and the conventional branch pipe are connected via the spear-type joining member because the shaft of the attachment port of the attachment pipe 15 and the shaft of the receiving port in the conventional branch pipe substantially coincide with each other. Since this spear-type joining member is a special member, in order to use the spear-type joining member, it is necessary to secure a working space, and it is not easy to connect the attachment pipe 15 and the conventional branch pipe. It was. However, in this embodiment, the opening surface 57 of the second opening 55 of the branch pipe 30 faces the length direction of the main pipe 10, so that the shaft of the downstream end 17 of the attachment pipe 15 and the second opening of the branch pipe It does not coincide with the 55 axis. Therefore, the joint 80 of this embodiment can be used without using the spear-type joining member. As a result, it is easier to connect the attachment pipe 15 and the branch pipe 30 than in the prior art.

<Modification>
In the above embodiment, the cylindrical portion 43 of the branch pipe 30 is curved. However, the branch pipe of the present invention is not limited to the branch pipe 30 of the above-described embodiment, and may be a branch pipe 30A according to the first modification example described below or a branch pipe 30B according to the second modification example.

  FIG. 12 is a side view of the branch pipe 30A according to the first modification. As shown in FIG. 12, in the branch pipe 30A according to the first modification, the tubular portion 43A of the tubular body 40A has a straight tubular shape with a straight axis. A first opening 50 is formed at one end of the cylindrical portion 43A, and a second opening 55 is formed at the other end of the cylindrical portion 43A. Note that the branch pipe 30A according to the first modification has the same configuration as the branch pipe 30 of the above-described embodiment except for the configuration of the cylindrical portion 43A of the cylindrical body 40A, and a description thereof will be omitted.

  FIG. 13 is a side view of the branch pipe 30B according to the second modification. As shown in FIG. 13, in the branch pipe 30B according to the second modification, a part of the tubular portion 43B of the tubular body 40B is bent. The axis of the cylindrical portion 43B is bent at a substantially right angle. And the 1st opening part 50 is formed in the end of the cylindrical part 43B, and the 2nd opening part 55 is formed in the other end of the cylindrical part 43B. Note that the branch pipe 30B according to the second modification has the same configuration as the branch pipe 30 of the above embodiment except for the configuration of the cylindrical portion 43B of the cylindrical body 40B, and the description thereof is omitted.

  In addition, the branch pipe of the present invention may be such that a part of the cylindrical part is curved and a part of the cylindrical part is bent, or the cylindrical part is curved and the curved part is curved. There may be two or more locations.

  In the said embodiment, the tubular body 40 and the flange board 60 of the branch pipe 30 were integrally formed. However, the tubular body 40 of the branch pipe 30 and the flange plate 60 may be formed separately. When the tubular body 40 and the flange plate 60 are formed separately, a sealing member may be disposed between the tubular body 40 and the flange plate 60 so that drainage or the like flowing through the branch pipe 30 does not leak to the outside. preferable.

  In the said embodiment, the drain piping structure 1 was the structure of the piping for flowing the waste water etc. of each household. However, the water flowing through the drainage pipe structure of the present invention is not limited to the drainage of each household. For example, the drainage pipe structure of the present invention may be a pipe structure for flowing sewage such as rainwater.

DESCRIPTION OF SYMBOLS 1 Drain piping structure 10 Main pipe 15 Attachment pipe 30, 30A, 30B Branch pipe 40, 40A, 40B Tubular body 43, 43A, 43B Tubular part 50 1st opening part 55 2nd opening part 57 Opening surface 60 Flange board 62 Hole 80 Fitting

Claims (7)

A branch pipe connecting the main pipe of the drainage pipe structure and the mounting pipe,
A flange plate with holes formed therein;
A first opening connected to the outer peripheral portion of the hole of the flange plate, a second opening having an opening surface connected to the attachment pipe, and the first opening and the second opening are connected to form a cylindrical shape. A tubular body having a tubular portion formed on
With
The cross section of the flange plate is a shape along the circumferential direction of the main pipe,
The axis of the second opening and the direction perpendicular to the cross section of the flange plate are substantially parallel,
The second opening is located above the first opening;
In the side view, the distance from the lower end of the flange plate to the axis of the second opening is longer than the distance from the opening surface of the second opening to the axis of the first opening.   The branch pipe according to claim 1, wherein the tubular portion is curved. With a branch,
The branch is
A flange plate with holes formed therein;
A first opening connected to the outer peripheral portion of the hole of the flange plate, a second opening having an opening surface connected to the attachment pipe, and the first opening and the second opening are connected to form a cylindrical shape. A tubular body having a tubular portion formed on
With
The axis of the second opening and the direction perpendicular to the cross section of the flange plate are substantially parallel,
A main pipe which is arranged so as to be inclined downward toward the downstream, is arranged along the lower surface of the flange plate of the branch pipe, and is formed with a hole connected to the hole of the flange plate;
A mounting pipe connected to the main pipe via the branch pipe;
With
The cross section of the flange plate is a drainage pipe structure having a shape along the circumferential direction of the main pipe.   The drainage pipe structure according to claim 3, wherein the axis of the main pipe is located between the center of the second opening of the branch pipe and the center of the end face of the attachment pipe in plan view.   The drainage pipe structure according to claim 3 or 4, wherein the axis of the second opening and the axis of the main pipe are substantially parallel. A cylindrical joint connecting the second opening of the branch pipe and the mounting pipe;
The joint is
A branch side opening connected to the second opening of the branch;
A mounting pipe side opening connected to the mounting pipe;
A joint tubular part connecting the branch pipe side opening and the attachment pipe side opening;
The drainage piping structure according to any one of claims 3 to 5, comprising: A method of connecting a main pipe and a mounting pipe of a drainage pipe structure using a branch pipe,
The branch is
A flange plate with holes formed therein;
A first opening connected to the outer peripheral portion of the hole of the flange plate, a second opening having an opening surface connected to the attachment pipe, and the first opening and the second opening are connected to form a cylindrical shape. A tubular body having a tubular portion formed on
With
The cross section of the flange plate is a shape along the circumferential direction of the main pipe,
The axis of the second opening and the direction perpendicular to the cross section of the flange plate are substantially parallel,
Removing the earth and sand on the existing main,
Detaching a part of the attachment pipe connected to the existing main from the existing main,
Removing the existing main and placing a new main;
Placing the lower surface of the flange plate of the branch pipe in the hole formed in the new main pipe;
Connecting the second opening of the branch pipe and a joint formed in a cylindrical shape, and connecting the joint and the attachment pipe;
How to connect branch pipes.

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