JP7267029B2 - Eccentric increaser and piping structure - Google Patents

Description

The present invention relates to an eccentric increaser and piping structure.

In general, the roof of a building or the like is provided with a recess or a roof drain for receiving rainwater and draining it to the ground. In the concave portion and roof drain, there is a water collector, a plurality of pipes (pipe members), a piping structure that draws rainwater that has flowed down to the lower end of the pipes connected to each other and guides it to the water collection basin, and a joint that connects each member etc. are provided. In recent years, in order to increase the drainage capacity of recesses and roof drains, a drainage structure has been proposed in which the inside of a pipe is filled with water to generate a siphon phenomenon and dramatically increase the amount of drainage.

For example, Patent Literature 1 discloses a siphon-type rainwater drainage device having a siphon pipe with an opening area of 3 to 13 cm ² .

JP 2004-308399 A

In large buildings such as large condominiums and factories, the pipes used for the drainage structure are long, and the rainwater flowing down the pipes in a full state due to the siphon phenomenon rushes into the drainage structure. If the momentum of the rainwater is maintained as it is, the pipes and the catchment catches are likely to be damaged by the impact when the rainwater hits the peripheral walls of the pipes of the piping structure and the walls of the catchment catches.

Therefore, in some cases, the piping structure is provided with an eccentric increaser in which the lower side of the peripheral wall of the pipe descends in a cross section orthogonal to the central axis while increasing in diameter from the upstream side to the downstream side. Specifically, an eccentric increaser is arranged between a small diameter straight pipe arranged on the upstream side and a large diameter straight pipe arranged on the downstream side. The downstream end of the small diameter straight pipe and the upstream end of the eccentric increaser are connected, and the downstream end of the eccentric increaser and the upstream end of the large diameter straight pipe are connected.

However, in the conventional piping structure, the angle of the eccentric increaser when viewed in cross section varies depending on the worker when constructing the drainage structure, and there is a risk that the lower end of the eccentric increaser will be displaced from directly below in the circumferential direction. If the lower end of the eccentric increaser deviates in the circumferential direction from directly below, the rainwater that has changed its flow direction at the enlarged diameter portion will dam up the flow of rainwater that flows down from the downstream side, lowering the drainage capacity of the piping structure. put away.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an eccentric increaser that can be easily installed with the lower end of the enlarged diameter portion facing directly downward, and a piping structure provided with the eccentric increaser.

The eccentric increaser of the present invention is connected to a horizontally extending first straight pipe portion and one end of the first straight pipe portion, and the upper end extends from the upper end of the first straight pipe portion to the first straight pipe portion. a diameter-enlarging portion extending along the central axis of the portion and having a lower end that expands in diameter along the central axis so as to descend as it separates from the first straight pipe portion; a second straight pipe portion having a diameter larger than that of the first straight pipe portion and connected to the end portion having a larger inner diameter; A mating portion is provided, and a first linear portion extending along the central axis is provided on each of the outer peripheral surfaces of the first straight pipe portion and the second straight pipe portion, and is positioned at the position in the circumferential direction of the enlarged diameter portion. It is characterized in that the joint portion and the first linear portion are overlapped.

According to the eccentric increaser described above, the enlarged diameter portion is provided with the alignment portion. Therefore, by overlapping the first linear portion with the alignment portion in the circumferential direction, the position and orientation of the lower end of the enlarged diameter portion are associated with the respective first linear portions of the first straight pipe portion and the second straight pipe portion. be done. In such an eccentric increaser, the first linear portions of the first straight pipe portion and the second straight pipe portion are used as a reference line, and the operator can instantly recognize the lower end of the enlarged diameter portion by visual inspection. can be installed with the bottom edge facing downwards.
By the way, during construction, other pipe members are connected to both ends of this eccentric increaser. At this time, the first linear portions are provided in the first straight pipe portion and the second straight pipe portion forming both ends of the eccentric increaser, instead of the enlarged diameter portion forming the central portion of the eccentric increaser. Therefore, another pipe member can be connected to the position of each first linear portion. Therefore, according to the above-described eccentric increaser, the pipe members can be easily installed on both sides in the central axis direction with the lower end of the enlarged diameter portion directed downward.

In the eccentric increaser of the present invention, the alignment portion may extend linearly along the central axis.

In the eccentric increaser described above, the alignment portion extends linearly along the central axis of the enlarged diameter portion. The degree to which the directions of the straight pipe portions match is improved, and it becomes possible to accurately install the above-described eccentric increaser between the pipe members so that the lower end of the above-described eccentric increaser faces directly downward.

In the eccentric increaser member of the present invention, the alignment portion includes a position overlapping the lower end in the circumferential direction, a position forming 90° from the lower end with respect to the central axis in a cross section orthogonal to the central axis, and the It may be provided in at least one position overlapping the upper end in the circumferential direction.

According to the above-described eccentric increaser, the alignment portion is provided at at least one of the above-described positions, so that the alignment portion can be easily visually recognized even when viewed from any direction during construction. This makes it possible to easily install the eccentric increaser between the pipe members with the lower end of the eccentric increaser directed directly downward regardless of the environment at the time of construction.

The piping structure of the present invention includes the eccentric increaser according to any one of the above items, an upstream pipe member connected to the other end of the first straight pipe portion, and the other of the second straight pipe portion. a second linear portion extending along the central axis is provided on each outer peripheral surface of the upstream pipe member and the downstream pipe member, and the peripheral The first linear portion and the second linear portion overlap in a direction.

According to the above-described piping structure, the linear portion is used as a reference line, and the lower end of the enlarged-diameter portion is instantly aligned directly below by visual inspection, and the upstream pipe member can be easily attached to the first straight pipe portion in a predetermined direction. Further, the downstream pipe member can be easily connected to the second straight pipe portion in a predetermined direction. Specifically, the linear portions of the first straight pipe portion and the upstream pipe member, and the linear portions of the second straight pipe portion and the downstream pipe member are superimposed on the same line so that the lower end of the eccentric increaser is directly below. The orientations of the upstream side pipe member and the downstream side pipe member can be easily matched in a state facing the two.

In the piping structure of the present invention, the first straight pipe portion and the upstream pipe member are connected by a first electric fusion joint, and the second straight pipe portion and the downstream pipe member are connected by a second electric fusion joint. The first linear portion and the second linear portion may be positioned outside the first electrical fusion joint and the second electrical fusion joint.

According to the piping structure described above, the ends of the upstream pipe member, the first straight pipe portion, the downstream pipe member, and the second straight pipe portion are used as sockets for the first electric fusion joint and the second electric fusion joint. Since the first linear portion and the second linear portion are exposed to the outside of each receptacle even when inserted, the lower ends of the enlarged diameter portions can be visually recognized with certainty.

According to the eccentric increaser and piping structure of the present invention, it can be easily installed in a state in which the lower end of the enlarged diameter portion faces directly downward.

BRIEF DESCRIPTION OF THE DRAWINGS It is the side view which fracture|ruptured a part of drainage structure provided with the piping structure of one Embodiment of this invention. FIG. 2 is a side view of an eccentric increaser provided in the drainage structure shown in FIG. 1; FIG. 3 is a cross-sectional view of the eccentric increaser taken along line XX shown in FIG. 2, showing a state in which the linear portion is aligned with the alignment portion; FIG. 3 is a cross-sectional view of the eccentric increaser taken along line XX shown in FIG. 2, showing a state in which the position of the linear portion is displaced from the alignment portion; Fig. 3 is a side view for explaining how to assemble the eccentric increaser shown in Fig. 2; FIG. 2 is a side view of the piping structure shown in FIG. 1;

An embodiment of the eccentric increaser and piping structure of the present invention will be described below with reference to the drawings. The drawings used in the following description are schematic.

FIG. 1 is a partially cutaway side view of a drainage structure 100 having a piping structure 10 of the present invention. As shown in FIG. 1, the drainage structure 100 is open and connected to the bottom surface of the recess 102 formed on the roof of the building 300 . The drainage structure 100 includes a recess 102 , an elbow 104 connected to the downstream side of the recess 102 , a siphon generator 106 connected to the upstream end of the elbow 104 and arranged inside the recess 102 , and a downstream side of the elbow 104 . Tubing 108 connected to the end, elbow 110 connected to the downstream end of tubing 108 , tubing 112 connected to the downstream end of elbow 110 , tubing 112 connected to the downstream end of tubing 112 . a piping structure 10 connected to the downstream end of the elbow 114-2; and an elbow 116 connected to the downstream end of the piping structure 10.

The downstream end of tubing member 112 penetrates ground 200 and elbows 114, 116 and piping structure 10 are buried in the ground. The downstream side of the piping structure 10 is connected to an underground catchment basin 120 with the elbow 116 located inside the catchment basin 120 .

The rainwater that has flowed into the recess 102 flows down the hollow spaces of the elbow 104 , the pipe member 108 , the elbow 110 , and the pipe member 112 in a full state by the siphon generator 106 , is laterally pulled by the elbow 114 , and is pulled laterally by the pipe structure 10 and the elbow 116 . It flows down the hollow space of The rainwater 5 discharged and collected in the water collection basin 120 is drained from a drainage pipe 122 connected to the water collection basin 120 to a drainage facility (not shown).

The piping structure 10 includes a straight pipe (upstream pipe member) 20 connected to the downstream side of the elbow 114-2, an eccentric increaser 40, and a straight pipe (downstream pipe member) 30 passing through the water collecting mass 120. As will be described later, the eccentric increaser 40 has a portion whose diameter expands downward from the central axis, and absorbs rainwater that flows vigorously down from the pipe member 112 and is laterally pulled by the elbows 114-1 and 114-2. They are provided to contain and slow down rainwater.

As shown in FIG. 2, the eccentric increaser 40 has, in order from the upstream side, a first straight pipe portion 41 extending in the horizontal direction and a downstream end portion (one end portion) 42 of the first straight pipe portion 41. It has a connected enlarged diameter portion 43 and a second straight tube portion 47 connected to a downstream end portion of the enlarged diameter portion 43 (an end portion of the enlarged diameter portion having a larger inner diameter) 44 .

Four linear portions (first linear portions) 72-1, 72-2, 72-3, 72 extending in the direction along the central axis 50 (central axis direction) are formed on the outer peripheral surface of the first straight pipe portion 41. -4 is provided. As shown in FIG. 3, the linear portion 72-1 is provided at a position overlapping the lower end 58 in the circumferential direction when viewed in cross section of the first straight pipe portion 41 orthogonal to the central axis 50. As shown in FIG. The linear portion 72-2 is provided at a position overlapping the upper end (a position symmetrical to the lower end with respect to the central axis) 54. As shown in FIG. Further, the linear portions 72-3 and 72-4 are provided at positions forming an angle of 45° from the lower end 58 with respect to the central axis 50. As shown in FIG. That is, the linear portions 72-1, 72-2, 72-3, and 72-4 are arranged at intervals of 90° in the circumferential direction with the lower end 58 as a starting point. Hereinafter, these linear portions are collectively referred to as the linear portion 72 when describing the contents common to the linear portions 72-1, 72-2, 72-3, and 72-4.

The first straight pipe portion 41, the enlarged diameter portion 43, and the second straight pipe portion 47 are made of, for example, polyethylene, olefin resin such as polypropylene, or resin such as polyvinyl chloride. Since the first straight pipe portion 41 has uniform inner and outer diameters along the central axis 50, it is manufactured by extrusion molding, for example. The linear portion 72 may be printed during the above-described extrusion molding, and is extruded simultaneously with the resin that is the material of the first straight pipe portion 41 during the above-described extrusion molding with a resin of a different color from that of the first straight pipe portion 41. may be molded with When viewed in cross section, the radially outer surface of the linear portion 72 is substantially flush with the outer peripheral surface of the first straight pipe portion 41 .

As shown in FIG. 2 , a small-diameter straight pipe portion (first straight pipe portion) 46 is integrally provided with the enlarged diameter portion 43 on the upstream side of the enlarged diameter portion 43 . The inner and outer diameters of the small-diameter straight pipe portion 46 are substantially the same as the inner and outer diameters of the first straight pipe portion 41 . A large-diameter straight pipe portion (second straight pipe portion) 48 having a diameter larger than that of the small-diameter straight pipe portion 46 is integrally provided with the large-diameter portion 43 on the downstream side of the large-diameter portion 43 . The inner and outer diameters of the large-diameter straight pipe portion 48 are substantially the same as the inner and outer diameters of the second straight pipe portion 47, which is larger in diameter than the first straight pipe portion 41 shown in FIG.

As shown in FIGS. 2 and 3, in the cross section of the enlarged diameter portion 43 orthogonal to the central axis 50 of the first straight pipe portion 41, the upper end 51 of the enlarged diameter portion 43, the upper end 52 of the small diameter straight pipe portion 46, and the large diameter The upper end 53 of the pipe portion 48 overlaps with the upper end 54 of the first straight pipe portion 41 and the upper end 55 of the second straight pipe portion 47 . Hereinafter, the cross section of each member perpendicular to the central axis 50 may be simply referred to as the "cross section".

On the other hand, the upstream end of the lower end 56 of the enlarged diameter portion 43 and the lower end 57 of the small diameter straight pipe portion 46 overlap the lower end 58 of the first straight pipe portion 41 in the same cross section, that is, in the circumferential direction. The enlarged diameter portion 43 has an enlarged diameter such that the lower end 56 descends along the center axis 50 as it separates from the first straight pipe portion 41 . The downstream end of the lower end 56 of the enlarged diameter portion 43 and the lower end 59 of the large diameter straight pipe portion 48 overlap the lower end 60 of the second straight pipe portion 47 .

A positioning portion 45 indicating a lower end 56 is provided on the outer peripheral surface of the enlarged diameter portion 43 . By "indicating the lower edge 56" is meant that the relative position of the alignment portion 45 with respect to the lower edge 56 is accurately known in advance. In this embodiment, the alignment portion 45 is composed of an alignment portion 45-1 that overlaps the lower end 56 and an alignment portion 45-2 that overlaps the upper end 51 when viewed in cross section, that is, in the circumferential direction. Overlapping in the circumferential direction means that positions in the circumferential direction overlap at least partially. The alignment portion 45-2 is located at the upper end 51 and is symmetrical with the lower end 56 with the central axis 50 interposed therebetween. The alignment portions 45-1 and 45-2 linearly extend along the central axis 50. As shown in FIG.

Since the enlarged diameter portion 43 is enlarged in diameter as described above, it is manufactured by injection molding, for example. The alignment portions 45-1 and 45-2 are formed by burrs generated by resin entering the dividing surface of the mold during injection molding.

The outer peripheral surface of the second straight tube portion 47 is provided with four linear portions (first linear portions) 74-1, 74-2, 74-3, and 74-4 extending in the direction along the central axis 50. ing. As shown in FIG. 3, the linear portion 74-1 is provided at a position overlapping the lower end 60 in the circumferential direction when viewed in cross section of the first straight pipe portion 41 orthogonal to the central axis 50. As shown in FIG. The linear portion 74-2 is provided at a position overlapping the upper end (position symmetrical to the lower end with respect to the central axis) 55. As shown in FIG. Further, the linear portions 74-3 and 74-4 are provided at positions forming an angle of 45° from the lower end 60 with respect to the central axis 50. As shown in FIG. That is, the linear portions 74-1, 74-2, 74-3, and 74-4 are arranged at intervals of 90° in the circumferential direction with the lower end 58 as the starting point. Hereinafter, these linear portions are collectively referred to as the linear portion 74 when describing the contents common to the linear portions 74-1, 74-2, 74-3, and 74-4.

When the linear portions 72 and 74 have a certain width in the circumferential direction, the position of the linear portions 72 and 74 means the center position of the linear portions 72 and 74 in the circumferential direction. The circumferential width of the linear portions 72 and 74 is preferably, for example, 4 mm or more and 50 mm or less. From the viewpoint of increasing the accuracy of alignment, it is preferable that the width of the linear portions 72 and 74 in the circumferential direction is small. 2 and 3, the widths of the linear portions 72 and 74 in the circumferential direction are enlarged in order to clearly explain the effects of the eccentric increaser 40 having the linear portions 72 and 74. there is

Since the second straight pipe portion 47 has uniform inner and outer diameters along the central axis 50, it is manufactured, for example, by extrusion, like the first straight pipe portion 41. As shown in FIG. The linear portion 74 may be printed during the above-described extrusion molding, and is extruded simultaneously with the resin that is the material of the second straight pipe portion 47 during the above-described extrusion molding with a resin of a different color from that of the second straight pipe portion 47. may be molded by When viewed in cross section, the radial outer surface of the linear portion 74 is substantially flush with the outer peripheral surface of the second straight pipe portion 47 .

In the eccentric increaser 40, the first straight pipe portion 41 and the second straight pipe portion 47 are individually manufactured by extrusion molding as described above, and the enlarged diameter portion 43 including the small diameter straight pipe portion 46 and the large diameter straight pipe portion 48 is formed. Manufactured by injection molding. As shown in FIG. 4, the end portion 42 and the upstream end portion 62 of the small diameter straight pipe portion 46 and the end portion 44 and the upstream end portion 64 of the large diameter straight pipe portion 48 are butt-jointed. That is, the ends 42 and 62 and the ends 44 and 64 are butted and joined along the central axis 50 .

When the end portions 42 and 62 and the end portions 44 and 64 are butt-joined together, the positions of the linear portions 72-1 and 74-1 in the circumferential direction around the central axis 50 are aligned with the alignment portion 45. It is adjusted to -1. In the circumferential direction, the positions of the linear portions 72-2 and 74-2 are aligned with the positioning portion 45-2. That is, the linear portions 72-1, 74-1 and the alignment portion 45-1 are positioned on the same straight line when viewed from the radially outer side of the eccentric increaser 40, and the linear portions 72-2, 74-1, 45-1 74-2 and the alignment portion 45-2 are located on the same straight line.

As shown in FIG. 6, the piping structure 10 includes the eccentric increaser 40 described above, the straight pipe 20 connected to the upstream end (the other end) 65 of the first straight pipe portion 41, and the second and a straight pipe 30 connected to the downstream end (the other end) 66 of the straight pipe portion 47 . The downstream end 22 and the end 65 of the straight pipe 20 are connected by an EF joint (first electrofusion joint) 81 . The end 66 and the upstream end 32 of the straight pipe 30 are connected by an EF joint (second electrofusion joint) 82 .

The outer peripheral surface of the straight pipe 20 has four linear portions (second linear portions) 76-1, 76-2, 76-3, and 76-4 extending in the direction along the center axis 50 (the direction of the center axis). is provided. The linear portions 76-1, 76-2, 76-3, and 76-4 are arranged in the circumferential direction of the straight pipe 20 and the first straight pipe portion 41, respectively, so that the linear portions 72-1, 72-2, and 72-3 , 72-4. That is, the linear portions 76-1, 76-2, 76-3, 76-4 are arranged at intervals of 90° in the circumferential direction.

The outer peripheral surface of the straight pipe 30 has four linear portions (second linear portions) 78-1, 78-2, 78-3, and 78-4 extending in the direction along the center axis 50 (the direction of the center axis). is provided. The linear portions 78-1, 78-2, 78-3, and 78-4 are arranged in the circumferential direction of the straight pipe 30 and the second straight pipe portion 47, respectively. , 74-4. That is, the linear portions 78-1, 78-2, 78-3, and 78-4 are arranged at intervals of 90° in the circumferential direction.

Hereinafter, these linear portions are collectively referred to as a linear portion 76 when describing the contents common to the linear portions 76-1, 76-2, 76-3, and 76-4. Further, when describing the contents common to the linear portions 78-1, 78-2, 78-3, and 78-4, these linear portions are collectively referred to as the linear portion 78. FIG.

The straight pipes 20 and 30 are made of, for example, polyethylene, olefin resin such as polypropylene, or resin such as polyvinyl chloride. Since the straight pipes 20 and 30 have uniform inner and outer diameters along the central axis 50, they are manufactured by, for example, extrusion molding, like the first straight pipe portion 41 and the second straight pipe portion 47. As shown in FIG. The linear portions 76 and 78 may be printed during the above-described extrusion molding, and are extruded simultaneously with the resin that is the raw material of the straight pipes 20 and 30 during the above-described extrusion molding with a resin of a different color from that of the straight pipes 20 and 30. may be molded with When viewed in a cross section perpendicular to the central axis of the straight pipe 20 , the radially outer surface of the linear portion 76 is substantially flush with the outer peripheral surface of the straight pipe 20 . Similarly, when viewed in a cross section perpendicular to the central axis of the straight pipe 30 , the radial outer surface of the linear portion 78 is substantially flush with the outer peripheral surface of the straight pipe 30 .

In the eccentric increaser 40 of the present embodiment described above, the enlarged diameter portion 34 is provided with the alignment portions 45-1 and 45-2, the first straight pipe portion 41 is provided with the linear portion 72, and the second straight pipe portion 41 is provided with the linear portion 72. A linear portion 74 is provided in the tubular portion 47 . By overlapping the linear portions 72-1 and 72-2 with the alignment portions 45-1 and 45-2, respectively, the position and direction of the lower end 56 in the circumferential direction are the same as those of the linear portions in the direction along the central axis 50. 72. Also, the linear portions 74-1 and 74-2 overlap the alignment portions 45-1 and 45-2, respectively, so that the position and direction of the lower end 56 in the circumferential direction are linear in the direction along the central axis 50. It is associated with the shape portion 74 . According to the eccentric increaser 40, with the linear portions 72 and 74 as a reference line, the lower end 56 is instantly directed downward by visual observation, and the linear portions 76 and 78, for example, are aligned with the positions of the linear portions 72 and 74, Straight pipes 20 and 30 can be connected on both sides in the direction along the central axis 50 .

In this embodiment, as shown in FIG. 2, the ends 42 and 62 and the ends 44 and 64 are butt-jointed. According to the eccentric increaser 40, as shown in FIG. The circumferential position and orientation of 56 can be easily and accurately associated with linear portions 72 and 74 . If the virtual axis 50-2 obtained by extending the central axis 50 to the enlarged diameter portion 43 deviates from the central axis 50 in a cross-sectional view, as shown in FIG. are displaced from the alignment portion 45-1. That is, the operator can easily visually recognize and determine whether or not the lower end 56 is directed directly downward, depending on the relative positional relationship between the positioning portion 45-1 and the linear portions 72-1 and 74-1.

Also, when the eccentric increaser 40 is viewed from the side, if the lower end 56 faces directly downward, as shown in FIG. 72-2 and 74-2 are visible at the upper end of the eccentric increaser 40 with a width half of the full width in the circumferential direction, the alignment portion 45-2 is aligned on the same line, and at the same time the linear portions 72-1 and 74-1 are aligned. It is visible at the lower end of the eccentric increaser 40 with a width half of the full width in the circumferential direction, and the alignment portion 45-1 is aligned on the same line. In other words, if the operator arranges the linear portions 72, 74 and the alignment portions 45-1, 45-2 relative to each other, the lower end 56 can be directed directly downward regardless of the operator.

In addition, according to the eccentric increaser 40, since the alignment portions 45-1 and 45-2 extend linearly along the central axis 50, compared to the case where the alignment portions 45 are scattered, for example, Therefore, the visibility of the orientation of the eccentric increaser 40 by visual observation can be enhanced. Further, since the alignment portions 45-1 and 45-2 extend linearly along the central axis 50, the linear portion 72-1, the alignment portion 45-1, the linear portion 74-1, and The linear portion 72-2, the alignment portion 45-2, and the linear portion 74-2 can be arranged on the same line, and the directions of the first straight pipe portion 41 and the second straight pipe portion 47 can be matched. As a result, the eccentric increaser 40 can be accurately installed at a predetermined position, for example, between the straight pipes 20 and 30 with the lower end 56 directed downward.

In the eccentric increaser 40, the alignment portions 45-1 and 45-2 are provided at positions overlapping the lower end 56 and at positions symmetrical to the lower end 56 across the central axis 50 in cross section. Therefore, at least one of the positioning portions 45-1 and 45-2 can be easily visually recognized even when viewed from an arbitrary direction such as upward, downward, or sideways during construction. As a result, the eccentric increaser 40 can be easily installed, for example, between the straight pipes 20 and 30 with the lower end 56 directed directly downward, regardless of the environment during construction.

In addition, in the eccentric increaser 40, the linear portions 72 and 74 associated with the alignment portions 45-1 and 45-2 are arranged at intervals of 90° in the circumferential direction. At least two of each of the linear portions 72 and 74 are easily visible when viewed from any direction. Therefore, the effect that the eccentric increaser 40 can be easily installed with the lower end 56 directed downward is enhanced.

For example, when the eccentric increaser 40 is viewed from the side, if the lower end 56 faces straight down, as shown in FIG. 72-2 and 74-2 are visible at the upper end of the eccentric increaser 40 with a width half of the full width in the circumferential direction, the alignment portion 45-2 is aligned on the same line, and at the same time the linear portions 72-1 and 74-1 are aligned. It is visible at the lower end of the eccentric increaser 40 with a width half of the full width in the circumferential direction, and the alignment portion 45-1 is aligned on the same line. In other words, if the relative arrangement of the linear portions 72, 74 and the alignment portions 45-1, 45-2 can be visually recognized, it can be understood that the lower end 56 faces straight down.

The piping structure 10 of the present embodiment described above includes the eccentric increaser 40 and the straight pipes 20 and 30, the linear portions 72 and 76 overlap in the circumferential direction, and the linear portions 74 and 76 overlap each other in the circumferential direction. 78 overlap. When the piping structure 10 is constructed, the linear portions 72 and 74 are used as a reference line, and the linear portion 76 is aligned with the linear portion 72 in a state in which the lower end 56 is instantly aligned directly below by visual observation, and the first straight pipe portion 41 is assembled. The straight pipe 20 can be easily connected to the second straight pipe portion 47 in a predetermined direction, and the straight pipe 30 can be easily connected to the second straight pipe portion 47 in a predetermined direction by aligning the linear portion 78 with the linear portion 74 . That is, by overlapping the linear portions 72 and 76 and the linear portions 74 and 78 corresponding to each other in the circumferential direction on the same line, the lower end 56 of the eccentric increaser 40 is directed straight downward. The directions of 20 and 30 can be easily matched.

In the piping structure 10 , the first straight pipe portion 41 and the straight pipe 20 are connected by the EF joint 81 , and the second straight pipe portion 47 and the straight pipe 30 are connected by the EF joint 82 . As shown in FIG. 6 , the linear portion 76 is positioned outside the EF joint 81 and the linear portion 72 is positioned outside the EF joint 81 . The linear portion 74 extends outside the socket 85 of the EF joint 82 , and the linear portion 78 extends outside the socket 86 of the EF joint 82 . Therefore, even if the ends 22 , 65 , 66 , 32 are inserted into the sockets 83 , 84 , 85 , 86 respectively, the linear parts 76 , 72 , 72 , 76 , 72 , 72 Since 74 and 78 are exposed, the lower end 56 can be visually confirmed through the linear portions 76, 72, 74 and 78, and the direction of the eccentric increaser 40 can be visually confirmed by directing it downward.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the scope of the claims. Transformation and change are possible.

For example, in the above-described embodiment, the alignment portion 45 is formed by burrs during injection molding of the enlarged diameter portion 43. It may be formed in any manner as long as it has a form that can indicate the position to the operator. The enlarged diameter portion 43, the small diameter straight pipe portion 46, and the large diameter straight pipe portion 48 may be formed by a method other than injection molding. A method for forming the alignment portion 45 can be appropriately selected according to the method.

Also, in the above-described embodiment, the alignment portion 45 is formed linearly along the central axis 50, but the shape of the alignment portion of the present invention is not limited to a linear shape. For example, the alignment portion 45 may be formed in a dotted line shape along the central axis 50 . In addition, marks may be added to the outer peripheral surfaces of the upstream end and the downstream end of the expanded diameter portion 43 at positions indicating the lower end 56 .

Further, in the above-described embodiment, it was explained that the alignment portions 45 are formed at two locations, the lower end 56 and the upper end 51, but the alignment portions of the present invention are formed only at the lower end or the upper end of the enlarged diameter portion. may be formed. That is, the alignment portion may be provided at one or more positions indicating the lower end of the enlarged diameter portion.

In the above-described embodiment, the linear portions 72 and 74 are formed at four locations in the circumferential direction. It can be selected appropriately so as to match the position where the part is formed. In the position where the first linear portion of the present invention overlaps the lower end of the enlarged diameter portion in the circumferential direction, the position at which the first straight pipe portion forms 90° from the lower end with respect to the central axis of the first straight pipe portion when viewed in cross section, and in the circumferential direction If it is provided in at least one of the positions overlapping with the upper end, the operator can easily visually recognize the alignment portion even when viewed from any direction during construction. As a result, the eccentric increaser can be easily installed with the lower end facing directly downward regardless of the environment during construction or the posture of the worker when installing the eccentric increaser.

Further, each of the first linear portion and the second linear portion of the present invention is a single linear portion as shown in FIGS. 2 and 5, or a single strip having a predetermined width in the circumferential direction. It is not limited to cases. For example, each of the first linear portion and the second linear portion has a center line for alignment with the linear alignment portion, and a small predetermined interval on both sides of the center line in the circumferential direction. It may be configured by combining the arranged auxiliary lines.

Further, in the above-described embodiment, it has been described that the small diameter straight pipe portion 46 and the large diameter straight pipe portion 48 are provided integrally with the enlarged diameter portion 43 . Since the small diameter straight pipe portion 46 and the first straight pipe portion 41 and the large diameter straight pipe portion 48 and the second straight pipe portion 47 have the same diameter, these members can be butt-joined easily and accurately. However, the small diameter straight pipe portion 46 and the large diameter straight pipe portion 48 can be omitted if the enlarged diameter portion 43 can be satisfactorily connected to the first straight pipe portion 41 and the second straight pipe portion 47 .

Further, in the above-described embodiment, the straight pipes 20 and 30 are used as examples of the upstream pipe member and the downstream pipe member of the present invention. It may well be a branch pipe. The shapes of the upstream pipe member and the downstream pipe member can be appropriately changed according to the overall shape of the drainage structure and the construction environment.

41 First straight tube portion 43 Expanded diameter portions 45, 45-1, 45-2 Aligning portion 47 Second straight tube portion 50 Central shafts 72, 72-1, 72-2, 72-3, 72-4, 74, 74-1, 74-2, 74-3, 74-4 ... linear portion (first linear portion)

Claims (5)

a first straight pipe portion extending in the horizontal direction;
connected to one end of the first straight pipe portion, an upper end extending from the upper end of the first straight pipe portion along the central axis of the first straight pipe portion, and a lower end extending along the central axis of the first straight pipe portion; an enlarged diameter portion whose diameter is enlarged so as to descend as it moves away from the first straight pipe portion;
a second straight pipe portion having a diameter larger than that of the first straight pipe portion, one end of which is connected to the end portion of the enlarged diameter portion on the larger inner diameter side;
with
A position overlapping the lower end in the circumferential direction of the enlarged diameter portion, a position forming 90° from the lower end with respect to the central axis in a cross section perpendicular to the central axis, and the circumferential direction on the outer peripheral surface of the enlarged diameter portion. is provided at least one of the positions overlapping the upper end in the
A first linear portion extending along the central axis is provided on each outer peripheral surface of the first straight pipe portion and the second straight pipe portion,
the width of the first linear portion in the circumferential direction is greater than the width of the alignment portion in the circumferential direction;
The alignment portion and the first linear portion overlap in the circumferential direction ,
Eccentric increaser. The alignment portion linearly extends along the central axis,
The eccentric increaser of claim 1. The alignment portion is formed by burrs,
The one end of the first straight pipe portion and the end of the enlarged diameter portion on the smaller inner diameter side, and the one end of the second straight pipe portion and the larger inner diameter side of the enlarged diameter portion are each butt-jointed at the ends of
An eccentric increaser according to claim 1 or 2. An eccentric increaser according to any one of claims 1 to 3;
an upstream pipe member connected to the other end of the first straight pipe portion;
a downstream pipe member connected to the other end of the second straight pipe portion;
with
A second linear portion extending along the central axis is provided on each outer peripheral surface of the upstream pipe member and the downstream pipe member,
The first linear portion and the second linear portion overlap in the circumferential direction,
plumbing structure. The first straight pipe portion and the upstream pipe member are connected by a first electric fusion joint,
the second straight pipe portion and the downstream pipe member are connected by a second electrical fusion joint;
The first linear portion and the second linear portion are positioned outside the first electrical fusion joint and the second electrical fusion joint,
The piping structure according to claim 4.

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