JP7332373B2 - Vertical tube structure - Google Patents

Description

The present invention relates to a vertical tubular structure.

Conventionally, a vertical pipe structure has been used to connect an upstream horizontal pipeline and a downstream horizontal pipeline (see Patent Document 1, for example). In this vertical pipe structure, liquid such as sewage flows from the upstream horizontal pipeline toward the downstream horizontal pipeline.
An inspection lid (inspection window) is provided in the vertical pipe structure in order to confirm whether or not dirt or the like contained in the liquid remains in the vertical pipe structure.

JP-A-2002-146892

For example, if a center tube is positioned at the center of the longitudinal tube structure and liquid flows along the radially outer surface of the center tube, the center tube will be provided with an access lid.
However, when the access port projects radially outwardly from the central tube, liquid impinges on the access port. Therefore, there is a problem that the liquid becomes difficult to flow in the vertical tube structure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vertical pipe structure in which an inspection window is prevented from protruding radially outward from a center pipe.

In order to solve the above problems, the present invention proposes the following means.
The vertical pipe structure of the present invention comprises: a central pipe member having openings formed in side walls and through which liquid flows along a radially outer surface; and an inspection window provided at the radially inner end of the branch pipe and capable of opening and closing the branch pipe , wherein the inspection window is a shaft-shaped member arranged in the branch pipe. and a second flange provided at the radially inner end of the shaft-shaped member, the shaft-shaped member having a columnar shaft-shaped body and a cover member, A large-diameter hole and a small-diameter hole formed in the bottom surface of the large-diameter hole and extending in the axial direction of the shaft-like portion main body are formed in the shaft-like portion main body and the second flange, respectively. a second nut arranged in the large-diameter hole; and a second bolt having its shaft portion fitted to the second nut, wherein the head of the second bolt is the large-diameter hole of the second flange. The shaft portion is arranged in a diameter hole, and the shaft portion is arranged in the small diameter hole of the shaft-like portion main body and the small diameter hole of the second flange.
According to the present invention, the inspection window provided at the radially inner end of the branch pipe member extending radially inward from the central pipe member can open and close the branch pipe member. Since the inspection window is provided at a position spaced apart from the radially outer side of the central tube member, it is possible to prevent the inspection window from protruding radially outwardly from the central tube member.
In addition, the number of recessed portions from the radially outer surface of the central pipe member in the branch pipe member is reduced, making it difficult for liquid to enter the branch pipe member.

Further, in the above vertical pipe structure, the radially outer surface of the shaft-like member may be flush with the surface of the central pipe member. The fact that the surface of the shaft-like member is flush with the surface of the central tube member means that the radial step between the surface of the shaft-like member and the surface of the central tube member is within 1 cm, for example.
According to the present invention, when the liquid flows along the boundary between the surface of the central tube member and the surface of the shaft-shaped member, it is possible to suppress the disturbance of the liquid flow.

Further, in the vertical tubular structure described above, the surface of the shaft-like member may overlap the surface of the central tubular member when viewed in the axial direction of the central tubular member.
According to the present invention, it is possible to further suppress turbulence of the liquid flow when the liquid flows along one of the surface of the central tube member and the surface of the shaft-like member to the other.

Moreover, in the vertical pipe structure described above, a first flange may be provided at the radially inner end of the branch pipe member, and the second flange may be joined to the first flange .
According to the present invention, the branch pipe member and the shaft-like member can be connected through both flanges so as not to leak liquid.

According to the vertical pipe structure of the present invention, it is possible to prevent the inspection window from protruding radially outward from the center pipe.

1 is a vertical cross-sectional view of a vertical tubular structure according to one embodiment of the present invention; FIG. It is a perspective view of the center pipe material of the vertical pipe structure. Fig. 3 is a cross-sectional view of a branch pipe and an inspection window; It is a front view of the same branch pipe material and a 1st flange. It is a front view of the same inspection window. It is a perspective view which shows an example of the jig used when hanging|hanging the same inspection window to a 2nd step. FIG. 5 is a vertical cross-sectional view of a vertical tubular structure of a modified example of one embodiment of the present invention;

An embodiment of a vertical pipe structure according to the present invention will be described below with reference to FIGS. 1 to 7. FIG.
As shown in FIG. 1, the vertical pipe structure 1 of this embodiment is placed in a shaft 90 buried in the ground G and used. Below, the shaft 90 will be described first.
The shaft 90 is made of concrete or the like, and is arranged so that its axis extends in the vertical direction. For example, the shaft 90 has an outer diameter of several meters. The pit 90 is specifically a manhole or the like, and may be an assembly type formed by stacking a plurality of tubular bodies, or may be a cast-in-place manhole.

The upper and lower ends of the shaft 90 are closed by wall members 91 and 92, respectively. A through hole 91 a is formed in the central portion of the wall member 91 in a plan view so as to vertically penetrate the wall member 91 so that a worker can enter and exit the shaft 90 . A portion of the upper end of the shaft 90 below the wall member 91 is vertically partitioned by a first intermediate slab 93 . A through hole 93a is formed in the central portion of the first intermediate slab 93 in a plan view so as to penetrate the first intermediate slab 93 in the vertical direction. For example, the first intermediate slab 93 is formed of FRP or the like in a mesh shape.
A handrail 94 is provided on the peripheral edge of the through hole 93a in the first intermediate slab 93 so as to rise from the peripheral edge. A plurality of first steps 95 are fixed to the inner peripheral surface of the shaft 90 between the wall member 91 and the first intermediate slab 93 . The plurality of first steps 95 are arranged side by side in the vertical direction at intervals.

The upper end of shaft 90 is connected to manhole 105 . For example, the manhole 105 is an assembly type consisting of a straight wall and an inclined wall, and has a smaller diameter than the shaft 90 .
A plurality of steps 106 are fixed to the inner peripheral surface of the manhole 105 for lifting. The space inside the manhole 105 is connected to the through hole 91 a of the wall member 91 . The upper end of manhole 105 reaches the ground.

An outer opening 90b is formed in a portion of the outer side wall 90a of the shaft 90 below the first intermediate slab 93 . The end of the upstream horizontal pipeline 101 is connected to the peripheral edge of the outer opening 90 b of the shaft 90 .
An outer opening 90c is formed at a portion above the wall member 92 in the outer side wall 90a of the vertical shaft 90, in other words, at the lower end of the vertical shaft 90. As shown in FIG. The outer opening 90c is formed below the outer opening 90b. The end of the downstream horizontal pipe 102 is connected to the periphery of the outer opening 90c of the shaft 90 .

The vertical pipe structure 1 is for rehabilitating the shaft 90 . The vertical pipe structure 1 includes an outer pipe member 10 , a central pipe member 20 , branch pipe members 35 and an inspection window 40 .
The outer tube member 10 and the central tube member 20 are each tubular and arranged coaxially. The common axis of the outer tube member 10 and the central tube member 20 is hereinafter referred to as the axis O. As shown in FIG. A direction perpendicular to the axis O is simply called a radial direction, and a direction rotating around the axis O is simply called a circumferential direction. In this embodiment, the cross-sectional shapes perpendicular to the axis O of the outer tube member 10 and the center tube member 20 are circular.
The outer tube member 10 is made of concrete, FRP (Fiber Reinforced Plastics), or the like. The outer tube member 10 is arranged in the shaft 90 so that the axis extends in the vertical direction.
The outer tube member 10 is arranged on the wall member 92 . The upper end of the outer tube member 10 reaches the lower end of the outer opening 90b of the shaft 90. As shown in FIG. A space between the outer tube member 10 and the shaft 90 is filled with a filling member 97 such as mortar. The vertical shaft 90 and the vertical pipe structure 1 are integrated by connecting the outer pipe member 10 to the vertical shaft 90 by the filling member 97 .

A central tube 20 is positioned within the outer tube 10 . For example, the outer diameter of the central tube member 20 is about a little less than 1 m. In this example, the central tube member 20 includes a plurality of short tubes 21 arranged vertically and a laminate 38 (see FIG. 3) provided on each short tube 21 . The short pipe 21 is made of concrete, FRP, or the like. Note that the central tube member 20 may be integrally formed.
As shown in FIGS. 1 and 2, a second step 22 is fixed to the inner peripheral surface of each short pipe 21 . As shown in FIG. 2 , the second step 22 includes a pair of pillar members 23 , a plurality of treads 24 and a fixing member 25 .
The pair of column members 23 extend in the vertical direction and are spaced apart from each other in the circumferential direction. A plurality of treads 24 connect the pair of pillar members 23 in the circumferential direction. The plurality of treads 24 are arranged at intervals in the vertical direction. The fixing member 25 fixes the pair of pillar members 23 and the plurality of treads 24 to the short pipe 21 .
The second step 22 is arranged near a portion of the inner peripheral surface of the short pipe 21 in the circumferential direction.

The second step 22 fixed to the uppermost short pipe 21 among the plurality of short pipes 21 is preferably telescopic. Specifically, when the second step 22 is used, it can be extended upward from the short pipe 21, and when the second step 22 is not used, it is preferably shortened and housed in the short pipe 21. - 特許庁

As shown in FIGS. 1 and 2, a pair of vertically adjacent short pipes 21 are fixed with their axial ends facing each other. An annular second intermediate slab 28 is fixed coaxially with the axis O between a pair of vertically adjacent short pipes 21 . For example, the second intermediate slab 28 is formed of FRP or the like in a mesh shape. The inner diameter of the second intermediate slab 28 is a size that allows the operator P to easily pass through the inside of the second intermediate slab 28 .

As shown in FIG. 1 , the upper end of the central tube member 20 is positioned below the first intermediate slab 93 . The upper end of the central tube member 20 preferably extends above the outer opening 90b. The vertical positions of the lower end of the central tube member 20 and the upper end of the outer opening 90c are approximately the same.
A ladder 31 is connected to the lowermost short pipe 21 among the plurality of short pipes 21 (hereinafter also referred to as short pipe 21A). The lower end of ladder 31 reaches wall member 92 . When ladder 31 is not in use, ladder 31 is preferably retractable within short tube 21A.

A helically formed guide plate 30 is arranged between the outer tube member 10 and the central tube member 20 . The spiral axis of the guide plate 30 coincides with the axis O. As shown in FIG. That is, the guide plate 30 is continuously curved obliquely downward toward one side in the circumferential direction. The guide plate 30 is made of concrete, FRP, or the like.
The guide plates 30 are fixed to the outer peripheral surface of the central tube member 20 and the inner peripheral surface of the outer tube member 10, respectively. A spiral guide path C1 is defined by the outer tube member 10, the central tube member 20, and the guide plate 30. As shown in FIG. The guide path C1 runs along the guide plate 30, the radially outer surface 21c of the central tube member 20 (short tube 21), and the radially inner surface of the outer tube member 10, respectively. Sewage (liquid) F flows along the guide path C1.
In the vertical pipe structure 1, the guide plates 30 are not separated in the vertical direction but are integrated.

In addition, the guide plate may be formed in a stepped shape. That is, the guide plate may be configured such that the downward portion and the portion along the horizontal plane are alternately arranged in one of the circumferential directions. The guide plate 30 may be formed integrally with the center tube member 20, or may be formed separately from the center tube member 20 and then fixed to each other.
The guide plate 30 may be formed discontinuously. That is, a plurality of guide plates 30 may be arranged in a spiral shape with a space between them.

As shown in FIGS. 1 and 2, at least one of the short pipes 21 is provided with the branch pipe member 35 and the inspection window 40 . The branch pipe member 35 and the inspection window 40 will be described in detail below.
FIG. 3 is a cross-sectional view of the branch pipe member 35 and the inspection window 40 as viewed in the direction of the axis O. As shown in FIG. As shown in FIG. 3, the side wall 21a of the short tube 21 is formed with an inner opening (opening) 21b. The inner opening 21b radially penetrates the side wall 21a.
The branch pipe member 35 is formed in a tubular shape and extends radially inward from the peripheral portion of the inner opening 21b of the short pipe 21 (the central pipe member 20). As shown in FIGS. 3 and 4, a first annular flange 36 is fixed to the radially inner end of the branch pipe member 35 . The first flange 36 extends radially outward of the branch pipe member 35 from the end portion of the branch pipe member 35 . The first flange 36 is formed over the entire circumference of the branch pipe member 35 . The radially inner outer surface of the first flange 36 is flat. A through hole 36a is formed in the first flange 36 so as to pass through the first flange 36 . A plurality of through holes 36 a are formed around the axis of the first flange 36 .

As shown in FIG. 3 , a first nut 37 is fixed to the radially outer surface of the first flange 36 . A plurality of first nuts 37 are arranged at positions corresponding to the through holes 36a.
In this example, a laminate 38 made of FRP is arranged at the connecting portion between the short pipe 21 and the branch pipe member 35 . The laminated body 38 includes a first laminated body 38a covering the radially outer side of the connecting portion between the short pipe 21 and the branch pipe member 35, and a second laminated body covering the radial inner side of the connecting portion between the short pipe 21 and the branch pipe member 35. 38b and. The first laminated body 38 a and the second laminated body 38 b connect the short pipe 21 and the branch pipe member 35 .

The inspection window 40 includes a shaft-like member 41 , a second flange 42 and a joint member 43 .
The shaft-like member 41 is formed in a shaft shape along one of the radial directions. The shaft-like member 41 is arranged inside the branch pipe member 35 . The shaft-like member 41 includes a shaft-like portion main body 44 and a cover member 45 that covers the outer surface of the shaft-like portion main body 44 .
The shaft-like portion main body 44 is formed in a cylindrical shape. The radially outer surface of the shaft-like portion main body 44 is curved so as to be convex radially outward. The shaft-like portion main body 44 is preferably made of synthetic wood, ESLON NEO LUMBER FFU (manufactured by Sekisui Chemical Co., Ltd.). A large-diameter hole (reference numeral omitted) is formed in the radially outer surface of the shaft-like portion main body 44 . A plurality of large-diameter holes are formed around the axis of the shaft-like portion main body 44 . The shaft-shaped portion main body 44 is formed with small-diameter holes (reference numerals omitted) extending from the bottom surfaces of the large-diameter holes in the axial direction of the shaft-shaped portion main body 44 . The inner diameter of the small diameter hole is smaller than the inner diameter of the large diameter hole. The small-diameter hole reaches the radially inner surface of the shaft-like portion main body 44 .

The cover member 45 is formed in a cylindrical shape with a bottom, and covers the radially outer surface and side surfaces of the shaft-like portion main body 44 . The cover member 45 is preferably made of FRP. The outer diameter of the cover member 45 is smaller than the inner diameter of the branch pipe member 35 .
A radially outer surface 45a of the cover member 45 is curved so as to be convex radially outward.

The second flange 42 is provided at the radially inner end of the shaft-like member 41 . The second flange 42 is made of a material such as polyvinyl chloride (PVC) and has a disc shape.
The outer diameter of the second flange 42 and the outer diameter of the first flange 36 are equal to each other. As shown in FIGS. 3 and 5, the second flange 42 is formed with a through hole 42a passing through the second flange 42. As shown in FIGS. A plurality of through holes 42 a are formed around the axis of the second flange 42 corresponding to the through holes 36 a of the first flange 36 . The first surface of the second flange 42 contacts the radially inner surface of the first flange 36 .
A large-diameter hole (reference numeral omitted) is formed on the second surface of the second flange 42 opposite to the first surface. A plurality of large-diameter holes are formed around the axis of the second flange 42 corresponding to the large-diameter holes of the shaft-like portion main body 44 . The second flange 42 is formed with small-diameter holes (not shown) extending from the bottom surfaces of the large-diameter holes in the axial direction of the second flange 42 . The inner diameter of the small-diameter hole is smaller than the inner diameter of the large-diameter hole of the second flange 42 . The small diameter hole reaches the first surface of the second flange 42 .

A handle 47 is attached to the second surface of the second flange 42 . The handle 47 is U-shaped and rises from the second surface of the second flange 42 . The handle 47 is preferably switchable between a state of standing up from the second surface and a state of lying down along the second surface.

As shown in FIG. 3, the joint member 43 includes a second bolt 49 and a second nut 50. As shown in FIG. The second nut 50 is fixed to the shaft-like portion main body 44 while being arranged in the large-diameter hole of the shaft-like portion main body 44 . The head of the second bolt 49 is arranged inside the large diameter hole of the second flange 42 . The shaft portion of the second bolt 49 is arranged in the small diameter hole of the second flange 42 and the small diameter hole of the shaft-like portion main body 44 , and is fitted with the second nut 50 . Thereby, the second flange 42 is fixed to the shaft-like portion main body 44 .

A first bolt 52 is used to join the first flange 36 and the second flange 42 together. A shaft portion of the first bolt 52 is arranged in the through hole 42 a of the second flange 42 and the through hole 36 a of the first flange 36 , respectively, and fitted with the first nut 37 . Thereby, the second flange 42 is joined to the first flange 36 , and the inspection window 40 is attached to the radially inner end portion of the branch pipe member 35 . The inspection window 40 closes the branch pipe member 35 . The first flange 36 and the second flange 42 are bolted together.
In addition, a sealing member for stopping water may be arranged between the first flange 36 and the second flange 42 .

At this time, as shown in FIG. 3, the radially outer surface 45a of the shaft-like member 41 is flush with the radially outer surface 38a1 of the first laminate 38a (the central tube member 20). The fact that the surface 45a of the shaft-like member 41 is flush with the surface 38a1 of the first laminate 38a means, for example, that the surface 45a of the shaft-like member 41 and the surface 38a1 of the first laminate 38a are aligned in the radial direction. It means that the step is within 1 cm.
In FIG. 3, the surface 45a of the shaft-like member 41 overlaps the surface 38a1 of the first laminate 38a. That is, the curvature (curvature radius) of the surface 45a of the shaft-like member 41 and the curvature (curvature radius) of the surface 38a1 of the first laminate 38a are equal to each other.
On the other hand, the fitting between the first bolt 52 and the first nut 37 is released, and the first bolt 52 is pulled out from the through hole 42 a of the second flange 42 and the through hole 36 a of the first flange 36 . As a result, the second flange 42 is separated from the first flange 36, and the branch pipe member 35 is opened without being blocked. Thus, the inspection window 40 can open and close the branch pipe member 35 .

As shown in FIG. 1, the vertical distance L between the upper surface of the second intermediate slab 28 disposed immediately below the inspection window 40 and the axis of the inspection window 40 is preferably 70 cm or more, and preferably 165 cm. It is more preferable to have When the worker P sits on the second intermediate slab 28 and works using the inspection window 40, the distance L is preferably 70 cm or more. On the other hand, when the worker P stands on the second intermediate slab 28 and works using the inspection window 40, the distance L is preferably 165 cm. In addition, it is preferable that the distance L is 2 m or less.
The inspection window 40 is preferably arranged on the opposite side of the second step 22 with the axis O interposed therebetween. The inspection window 40 is arranged such that a second reference line connecting the inspection window 40 and the axis O is 90 degrees with respect to a first reference line connecting the second step 22 and the axis O on a plane perpendicular to the axis O. may be arranged at a position forming
The first flange 36 and the second flange 42 may be connected via a hinge or the like so that the inspection window 40 can be opened and closed with respect to the branch pipe 35 without removing the inspection window 40 from the branch pipe 35 .

The inspection window 40 detached from the branch pipe member 35 is preferably temporarily hung on the second step 22 arranged near the branch pipe member 35 . Although the jig used at this time is not particularly limited, for example, a jig 60 shown in FIG. 6 can be used. In addition, in FIG. 6, the second step 22 and the inspection window 40 are indicated by two-dot chain lines.
The jig 60 includes a pair of side plates 61 arranged to face each other, and a top plate 62 connecting the ends of the pair of side plates 61 to each other. The pair of side plates 61 are arranged so as to face each other in the thickness direction. The distance between the pair of side plates 61 is the same as the width of the tread 24 of the second step 22 . The pair of side plates 61 and top plate 62 are formed in a U shape that opens downward.
A pair of support rods 63 are fixed to one of the pair of side plates 61 . Each support rod 63 includes a bar-shaped small diameter portion 63a extending along a horizontal plane, and a large diameter portion 63b provided at a first end of the small diameter portion 63a. The outer diameter of the large diameter portion 63 b is larger than the outer diameter of the small diameter portion 63 a and smaller than the inner diameter of the through hole 42 a of the inspection window 40 . The length of the small diameter portion 63 a is longer than the thickness of the second flange 42 . A second end portion of the small-diameter portion 63a is fixed to the outer surface of one of the pair of side plates 61 opposite to the other.

Next, the operation of the vertical tube structure 1 configured as described above will be described.
The sewage F flows into the outer pipe member 10 of the vertical pipe structure 1 from the upstream horizontal pipeline 101 . The sewage F that has flowed into the outer pipe member 10 spirally flows down the guideway C1. At this time, due to the centrifugal force acting on the sewage F, the sewage F mainly flows near the radially inner surface of the outer pipe member 10 . The sewage F reduces its kinetic energy due to friction with the guide plate 30 when flowing through the guide path C1, and reaches the lower end of the outer pipe member 10. As shown in FIG. The sewage F that has reached the lower end of the outer pipe member 10 is discharged to the downstream horizontal pipe line 102 .
Meanwhile, the air in the outer tube 10 is collected near the axis O and flows upwardly through the center tube 20 .
When the sewage F flows down the guideway C1 in this manner, filth in the sewage F may stay in the guideway C1. A certain amount of filth flows due to the scavenging performance of the guide passage C1, in which the sewage F spirally flowing through the guide passage C1 flushes stagnant filth. However, some of the dirt remains in the guideway C1. In this case, maintenance such as removing the dirt is required.

In this case, the worker P enters the vertical tubular structure 1 through the manhole 105 . Specifically, steps 106 are used to descend into manhole 105 , and within shaft 90 , multiple first steps 95 are used to descend to first intermediate slab 93 . A second step 22 is used to descend through the center tube 20 and stand on a second intermediate slab 28 located immediately below the sight glass 40 as shown in FIG. At this time, the inspection window 40 is positioned just in front of the operator P's face.
The first bolt 52 is removed from the first nut 37 , the handle 47 is gripped, and the inspection window 40 is pulled out radially inward from the branch pipe member 35 . The inspection window 40 is hung on the second step 22 by inserting the pair of support rods 63 of the jig 60 into the through hole 42 a of the inspection window 40 removed from the branch pipe member 35 . Since the second flange 42 of the inspection window 40 is engaged with the large-diameter portion 63b of the support rod 63, the inspection window 40 is unlikely to fall off the support rod 63 unintentionally.
The inside of the guideway C1 is confirmed visually by the worker P or using a camera. Dirt in the guideway C1 is removed through the branch pipe member 35 as necessary.

After the maintenance of the vertical pipe structure 1 is finished, the shaft-like member 41 of the inspection window 40 is inserted into the branch pipe member 35 and the second flange 42 of the inspection window 40 is brought into contact with the first flange 36 . A shaft portion of the first bolt 52 is inserted into the through hole 42 a of the second flange 42 and the through hole 36 a of the first flange 36 , and the shaft portion is fitted to the first nut 37 . As a result, the inspection window 40 is attached to the branch pipe member 35 .
The worker P climbs through the center tube 20, the vertical shaft 90, and the manhole 105, and exits on the ground.

As described above, according to the vertical pipe structure 1 of the present embodiment, the inspection windows 40 provided at the radially inner ends of the branch pipes 35 extending radially inward from the central pipe 20 The pipe material 35 can be opened and closed. Since the inspection window 40 is provided at a position spaced apart from the radially outer side of the central tube member 20 , it is possible to prevent the inspection window 40 from protruding radially outward from the central tube member 20 .
The inspection window 40 has a shaft-like member 41 . Therefore, the portion of the branch pipe member 35 that is recessed from the radially outer surface of the central pipe member 20 is reduced, making it difficult for the sewage F to enter the branch pipe member 35 . Furthermore, it is possible to suppress the filth in the sewage F from being caught in the branch pipe material 35, and to suppress the impediment of the scavenging performance of the guideway C1.
Since the inspection window 40 does not protrude radially outward from the central tube member 20, it is possible to prevent the inspection window 40 from being damaged by the filth in the sewage F hitting the inspection window 40. - 特許庁Since it is possible to suppress the dirt in the sewage F from being caught on the inspection window 40, there is no risk of obstructing the operator's P visibility when the inspection window 40 is opened.

A surface 45 a of the shaft-like member 41 is flush with the surface 38 a 1 of the central tube member 20 . Therefore, when the sewage F flows along the boundary between the surface 38 a 1 of the central tube member 20 and the surface 45 a of the shaft-like member 41 , it is possible to prevent the flow of the sewage F from being disturbed.
The surface 45a of the shaft-like member 41 overlaps the surface 38a1 of the central tube member 20 when viewed in the direction of the axis O. As shown in FIG. Therefore, when the sewage F flows from one of the surface 38a1 of the central tube member 20 and the surface 45a of the shaft-like member 41 to the other, it is possible to further suppress the flow of the sewage F from being disturbed. Furthermore, it is possible to suppress the dirt in the sewage F from being caught on the surface 45a of the shaft-like member 41, thereby suppressing the hindrance of the scavenging performance of the guide path C1.

The longitudinal tubular structure 1 has a first flange 36 and the sight glass 40 has a second flange 42 joined to the first flange 36 . Thereby, the branch pipe member 35 and the shaft-like member 41 can be connected via the flanges 36 and 42 so that the sewage F does not leak.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and the configuration can be changed, combined, or deleted without departing from the scope of the present invention. etc. are also included.
For example, in the above embodiment, the branch pipe member 35 and the inspection window 40 may be connected by a hinge. In this case, the inspection window 40 can be opened and closed with respect to the branch pipe member 35 by rotating the inspection window 40 about the hinge with respect to the branch pipe member 35 . For example, it is preferable to notch a part of the flanges 36 and 42 in an arc shape or the like and attach the hinge to the notched portion.
A portion of the inspection window 40 may be formed of a transparent material. For example, at least part of the cover member 45 and the second flange 42 is made of a transparent material such as resin. The portion formed of a transparent material preferably penetrates the inspection window 40 in the radial direction or the like. Thus, with the inspection window 40 attached to the branch pipe member 35, the operator P inside the central pipe member 20 can visually observe the inside of the guideway C1 through the portion formed of a transparent material.

The inspection window 40 does not have to include the shaft-like member 41 .
The surface 45a of the shaft-like member 41 does not have to be flush with the surface 38a1 of the central tube member 20 . The surface 45a of the shaft-like member 41 may be flat or the like.
The vertical pipe structure 1 may not comprise the branch pipe 35 and the inspection window may be mounted directly on the inner opening 21 b of the short pipe 21 .
The cross-sectional shapes of the outer tube member 10 and the central tube member 20 perpendicular to the axis O are not limited to circular shapes, and may be ellipsoidal, rectangular, or the like.
The vertical tubular structure 1 may not have the outer tubular member 10 and the flanges 36,42.

The vertical pipe structure 1 using the inspection window 40 of the present embodiment is not limited to the above configuration. For example, as in the vertical pipe structure 2 shown in FIG. 7, a plurality of guide plates 70 and 71 may be arranged separately in the vertical direction inside the outer pipe member 10 . In this example, two guide plates 70 and 71 are vertically spaced apart from each other in the outer tubular member 10 . That is, a guide plate 71 is arranged below the guide plate 70 . The spiral pitch of the guide plate 71 is smaller than the spiral pitch of the guide plate 70 . Center tubes 20A and 20B are arranged on the spiral axes of the guide plates 70 and 71, respectively. The center tube members 20A and 20B are configured similarly to the center tube member 20, respectively.
The outer tube member 10, the central tube member 20A, and the guide plate 70 define a spiral first guide path C6. A cylindrical second guide path C7 is defined between the guide plate 70 and the guide plate 71 in the outer tube member 10 . The outer tube member 10, the central tube member 20B, and the guide plate 71 define a spiral third guide path C8.

In this case, for example, the outer tube member 10 is manufactured in a state of being divided into three parts corresponding to the first guideway C6, the second guideway C7, and the third guideway C8. At this time, for example, the portion of the outer tube member 10 corresponding to the first guide path C6 is manufactured integrally with the central tube member 20A and the guide plate 70 . The sections are then connected together after being installed on site.
Note that the number of divisions of the outer pipe member 10 and the like of the vertical pipe structure is not limited to three, and may be two, or four or more.
In the vertical pipe structure 2 of this modified example, the branch pipe member 35 and the inspection window 40 are provided in the central pipe member 20A. Note that the branch pipe member 35 and the inspection window 40 may be provided on the central pipe member 20B.

The liquid is not limited to sewage F, and may be wastewater discharged from a factory, water taken in from a river, or the like.

Reference Signs List 1, 2 Vertical tube structure 20, 20A, 20B Central tube member 21a Side wall 21b Inner opening (opening)
21c, 38a1, 45a surface 35 branch pipe member 36 first flange 40 inspection window 41 shaft-like member 42 second flange

Claims (4)

a central tube having openings formed in the sidewalls and having liquid flow along a radially outer surface thereof;
a branch pipe member extending radially inward from a peripheral edge portion of the opening in the central pipe member;
an inspection window provided at the radially inner end of the branch pipe and capable of opening and closing the branch pipe;
with
The inspection window is
a shaft-shaped member arranged in the branch pipe member;
a second flange provided at the radially inner end of the shaft-shaped member;
The shaft-shaped member is
a columnar shaft-shaped body;
a cover member;
A large-diameter hole and a small-diameter hole formed in the bottom surface of the large-diameter hole and extending in the axial direction of the shaft-shaped portion main body are formed in the shaft-shaped portion main body and the second flange, respectively,
a second nut arranged in the large-diameter hole of the shaft-like portion main body;
a second bolt whose shaft portion is fitted to the second nut;
with
the head of the second bolt is arranged in the large diameter hole of the second flange,
The shaft portion is a vertical pipe structure arranged in the small diameter hole of the shaft-like portion main body and the small diameter hole of the second flange. 2. The vertical tubular structure according to claim 1 , wherein the radially outer surface of the axial member is flush with the surface of the central tube member. The vertical pipe structure according to claim 1 or 2 , wherein the surface of the shaft-like member overlaps the surface of the central pipe when viewed in the axial direction of the central pipe. a first flange provided at the radially inner end of the branch pipe;
4. The vertical pipe structure according to any one of claims 1 to 3 , wherein said second flange is joined to said first flange .

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