JP6947576B2 - Vertical pipe with spiral flow guide - Google Patents

Description

The present invention relates to a vertical pipe provided with a spiral flow guide path for spirally flowing down inflow water introduced from the upper part of a vertical pipe such as a manhole.

In a manhole into which inflow water such as sewage or rainwater flows in, inflow inlets and outlets are usually formed at the upper and lower parts of the manhole.
A head is usually formed between the inlet and outlet of the inflow water, and the wall surface and bottom surface of the manhole are damaged by the force of the falling inflow water, and when the head becomes large, ground vibration and loud noise are generated. It may occur. For this reason, manholes provided with means for reducing the force of falling inflow water have been developed.

On the other hand, in the manhole, workers regularly or irregularly enter the manhole to perform maintenance and inspection work in order to investigate the deterioration of the manhole wall and check for abnormalities in the piping system. It must be maintained and managed.

In Patent Document 1, a vertical pipe accommodating a sewage guide path formed spirally around a hollow vertical rod is installed in a manhole, and the sewage flowing into the manhole is spirally bent in the vertical pipe. Described is an invention of a vertical pipe for sewerage, which can avoid damage to the bottom of a manhole by allowing it to flow down to weaken the impact of dropping sewage at the bottom of the vertical pipe.

However, the vertical pipe of the invention described in Cited Document 1 is formed by a screw-shaped flight around a hollow vertical rod in which a spirally formed sewage guide path is perforated with a small hole. Air must be introduced into the vertical rod from the small hole so that the sewage can flow smoothly without being disturbed, the structure is complicated, and a guideway with a large diameter like a manhole is manufactured. It is difficult.

Japanese Unexamined Patent Publication No. 8-41915

The present invention has been made in view of the above-mentioned problems of the prior art, and is a vertical pipe provided with a spiral flow guide path for reducing the force of inflow water such as rainwater and sewage, and has a structure of the spiral flow guide path. To provide a vertical pipe provided with a spiral flow guide, which is not complicated, can be easily installed in a vertical pipe, and can be easily manufactured with a large diameter of a spiral flow guide. Is the first purpose. A second object of the present invention is to provide a vertical pipe having a structure in which the spiral flow guide path allows workers and the like to walk.

In order to solve the above problems, the present invention employs the following means.
[1] A spiral flow guide member in which a hole for inserting a central column is formed, and a central column, which is a hollow tubular body, is inserted into the hole for inserting the central column, and the spiral flow guide member is erected around the central column. a vertical pipe provided with a spiral flow guideway formed by arranging in a bolt insertion hole formed in the nosing section and dansili portion of the outer end of the spiral flow guide member, the spiral flow guide members adjacent to each other , Formed so that the nose of the spiral flow guide member located on the upper side and the step tail of the spiral flow guide member located on the lower side overlap each other, and on the nose of the outer end of the spiral flow guide member located on the upper side. The formed bolt insertion hole and the bolt insertion hole formed at the step tail of the outer end of the spiral flow guide member located on the lower side are arranged so as to overlap each other, and the two overlapping bolt insertion holes are formed. it you characterized that tightening across the two spiral flow guide member adjacent to each other by the inserted bolt and nut, a vertical tube with a screw-swirl guide path.
[2] A spiral flow guide member in which a hole for inserting a core column is formed, and a core column which is a hollow tubular body is inserted into the hole for inserting the core column, and the spiral flow guide member is erected around the core column. It is a vertical pipe provided with a spiral flow guide path arranged in The portion of the member on the nose side is formed thinner than the end face by the thickness of the step, and the lower surface of the portion on the nose side is made higher than the lower end surface of the peripheral wall of the hole for inserting the helix. , The spiral flow guide members adjacent to each other are such that the nose portion of the spiral flow guide member located on the upper side and the step tail portion of the spiral flow guide member located on the lower side overlap each other, and the spiral flow guide member located on the upper side. A vertical pipe provided with a spiral flow guide path, characterized in that a step portion formed on a portion on the step tail portion side of a spiral flow guide member located on the lower side is housed on the lower surface of the portion on the step nose side portion of the above.
[3] A groove is formed in the step portion formed on the step tail portion side of the spiral flow guide member, and a protrusion is formed on the lower surface of the step nose portion side portion of the spiral flow guide member. The spiral flow guide members adjacent to each other are the protrusions on the lower surface of the step portion side portion of the spiral flow guide member located on the lower side and the step portion of the spiral flow guide member located on the upper side. The vertical pipe provided with the spiral flow guide path according to [2] , characterized in that
[4] The spiral flow guide member is any one of [1] to [3] , wherein the upper surface of the portion on the nose side of the step is inclined in a downward direction from the tail of the step toward the nose. A vertical pipe provided with the spiral flow guide path described in.
[5] The spiral flow guide member is provided with a gutter-shaped member at an outer end portion, and the gutter-shaped member is inclined in a downward direction from a step tail portion to a step nose portion . A vertical pipe provided with the spiral flow guide path according to any one of 1] to [4].
[6] The vertical pipe provided with the spiral flow guide path according to any one of [1] to [5] , wherein the vertical pipe is a manhole.

In the spiral flow guide path installed in the vertical pipe of the present invention, the spiral flow guide member constituting the spiral flow guide path is provided with a core column insertion hole, and the core column is inserted into the core column insertion hole to be erected. The spiral flow path guide path has a structure because a guide path for reducing the water force is constructed by spirally arranging the spiral flow guide members around the centered column and guiding the inflow water in a spiral shape. Is not complicated, it can be easily installed in a vertical pipe, and a large diameter one can be easily manufactured. Further, it has a structure in which the spiral flow guide path can be used as a staircase for workers and the like to move up and down in the vertical pipe for the purpose of maintenance and inspection.

It is a schematic cross-sectional view of the whole structure of the manhole (vertical pipe) in which the spiral flow guide path is installed. It is an external perspective view of the main part of a spiral flow guide path. It is a schematic plan view of a spiral flow guide path. It is a plan view (a) and a front view (b) of a spiral flow guide member. It is a perspective view of the means for arranging adjacent spiral flow guide members and erection of a central pillar. It is a figure which shows the two spiral flow guide members which are adjacent to the top and bottom tightened by a bolt and a nut. It is a schematic diagram which shows the cross section of the foam which was integrally molded with the exodermis and the foam core material. A perspective view (a) of the spiral flow guide member in which the upper surface of the portion on the nose side is inclined, and the upper surface of the spiral flow guide member seen from the outer end side of the spiral flow guide member when the spiral flow guide member is vertically adjacent to each other. It is a figure (b) which shows typically the flow of the inflow water in. It is a perspective view of the spiral flow guide member which formed the step portion in the part on the step tail portion side. FIG. 9 is a plan view of a spiral flow guide member in which a step portion is formed at a portion on the step tail portion side shown in FIG. It is a perspective view of the spiral flow guide path constructed by the spiral flow guide member which formed the step portion in the part on the step tail portion side. It is a perspective view of a different embodiment of a spiral flow guide member in which a step portion is formed in the portion on the step tail portion side. It is a perspective view which shows the lower surface (back surface) of the spiral flow path guide member shown in FIG. It is a perspective view of the spiral flow guide path constructed by the spiral flow guide member shown in FIG. It is a perspective view of a different embodiment of a spiral flow guide member in which a step portion is formed in the portion on the step tail portion side. It is a perspective view of the spiral flow guide member provided with the gutter-shaped member at the outer end. It is a perspective view of the spiral flow guide path formed by the spiral flow guide member provided with the gutter-shaped member at the outer end.

Hereinafter, embodiments of the present invention will be described with respect to the case where the vertical pipe is a manhole.

Inflow water such as rainwater and sewage flows in from the inflow pipe of the inflow port provided in the upper part of the manhole, and is discharged from the outflow pipe of the outflow port provided in the lower part of the manhole.
FIG. 1 shows a schematic cross-sectional view of the overall configuration of a manhole in which a spiral flow guide path is installed. 1 is a manhole in which a spiral flow guide path is installed, and 2 is a manhole skeleton forming a manhole body, which is usually made of concrete. 3 is a manhole cover plate, 4 is a manhole bottom plate, 5 is an inflow pipe into which inflow water flows in, and 6 is an outflow pipe through which inflow water flows out. An invert 7 may be formed on the bottom plate 4 of the manhole in order to improve the flow of the inflow water flowing down to the bottom of the manhole to the outflow pipe 6. 8 is a step for raising and lowering, and 10 is a spiral flow guide path.
The spiral flow guide path 10 has a height that reaches close to the level of the inflow pipe 5, and the inflow water flowing from the inflow pipe 5 flows down the upper surface of the spiral flow guide member described later that constitutes the spiral flow guide path 10. , It is discharged from the outflow pipe 6.

FIG. 2 shows a schematic external view of the spiral flow guide path 10, and FIG. 3 shows a schematic plan view of the spiral flow guide path installed in the manhole 2.
Here, 11 is a core column made of a hollow cylindrical body, and 12 is a spiral flow guide member constituting the spiral flow guide path 10. Reference numeral 124 denotes a bolt insertion hole formed in the spiral flow guide member 12. A bolt is inserted into this hole, and adjacent spiral flow guide members are fastened with bolts and nuts as described later. Note that bolts and nuts are not shown in FIGS. 1 to 3.

4 (a) and 4 (b) show a plan view and a front view of the spiral flow guide member 12.
A core pillar insertion hole (through hole) 123 is formed in the inner end portion 121 (the end portion on the center side of the spiral flow guide path) of the spiral flow guide member 12, and the core pillar 11 is formed in the core pillar insertion hole 123. The spiral flow guide path 10 is configured by being inserted and deploying a plurality of spiral flow guide members 12 around the core column around the core column 11 (see FIGS. 2 and 3).

As can be seen from FIGS. 3 and 4, the spiral flow guide member 12 has a manhole on the outer peripheral side portion of the outer end portion 122 of the spiral flow guide member 12 in a state where the core pillar 11 is inserted into the core pillar insertion hole 123 of the spiral flow guide member. It has dimensions that are close to or in contact with the inner wall of the skeleton 2.

The spiral flow guide member 12 shown in FIG. 4 has a substantially fan shape that gradually widens from the vicinity of the inner end portion 121 toward the outer end portion 122, and has a constant thickness including the peripheral wall of the core column insertion hole 123. be. In the one shown in this figure, the inner end portion is slightly thickened to provide the core column insertion hole 123, but the width gradually narrows toward the inner end portion 122 like the spiral flow guide member shown in FIG. It may be.

Bolt insertion holes 124 and 124 into which bolts 13 described later are inserted are formed at two positions, a nose portion and a step tail portion, at the outer end of the spiral flow guide member 12. The bolt insertion hole 124 penetrates the spiral flow guide member 12 in the thickness direction.
Here, the step nose portion and the step tail portion refer to a portion on the front side of the spiral flow guide member and a portion on the back side of the spiral flow guide member when climbing the spiral flow guide path from the bottom to the top, respectively. FIG. 5, which shows a part of the spiral flow guide path that goes up clockwise, shows the step nose portion 125 and the step tail portion 126.

The core column 11 is a hollow tubular material, and a steel material, an aluminum alloy material, or the like can be used, but in order to further reduce the weight, it is desirable to use a synthetic resin material, and the fiber. Reinforced plastic material (FRP) is also suitable for strength. Synthetic resin products are also water resistant because they do not corrode due to rust.
Further, the central pillar 11 may be a split type. Short hollow cylinders can also be stacked into taller cylinders. To add a split-type shinbashira, either form a threaded portion that fits into each connection port and screw-join it, or insert a hollow core body for connection into each connection port and insert an embedded pin. A split type shinbashira can be added by inserting and connecting.

An example of the procedure for assembling the spiral flow guide path 10 will be described below, and the structure of the spiral flow guide path 10 will be shown.
First, the central pillar 11 is erected in the manhole 1.
The manhole 11 can be erected by being supported by a worker at the beginning of assembly, but it is the same as the inner diameter of the manhole 11 by placing concrete, for example, as shown in FIG. The core pillar 11 can also be erected by erection of the core body 15 having an outer diameter on an invert 7 or the like of a manhole and covering the core body 15 with the lower end portion of the core pillar 11.
Normally, the invert 7 has a recess (groove) formed in the central portion in the axial direction of the outflow pipe 6 so that the inflow water can easily flow out to the outflow pipe. , The upper surface of the invert 7 may be flattened without forming a recess (groove).
If there is no invert 7, a core body can be erected on the bottom plate 4.

Next, the spiral flow guide member 12, which is the first stage of the spiral flow guide path 10, is inserted from the upper end of the erected core column 11 into the core column insertion hole 123 of the spiral flow guide member. And attach it to the core 11. Subsequently, the second-stage spiral flow guide member 12 is attached to the core column 11 in the same manner, and is stacked on the first-stage spiral flow guide member.

Then, as shown in FIG. 5, the bolt insertion hole 124 formed in the step tail portion 126 of the outer end portion of the first-stage spiral flow guide member and the nose of the outer end portion of the second-stage spiral flow guide member. The second-stage spiral flow guide member is arranged on the first-stage spiral flow guide member so as to overlap the bolt insertion hole 124 formed in the portion 125.
Therefore, after the arrangement is completed in this way, as can be seen from FIGS. 2 and 5, the upper surface of the step tail portion of the first-stage spiral flow guide member 12 and the lower surface of the second-stage step nose portion come into contact with each other. Will overlap. Also in FIG. 2, when going up the spiral flow guide path, the second stage spiral flow guide member 12 is the same as the movement of the clock hand around the central pillar with respect to the first stage spiral flow guide member 12. It is arranged in a state of being rotated by a predetermined angle in the direction.

Then, as shown in FIGS. 5 and 6, the first-stage spiral flow guide member is provided in the bolt insertion holes 124 and 124 of the first-stage spiral flow guide member and the second-stage spiral flow guide member. The bolt 13 is inserted from the lower surface so that the upper end of the shaft portion of the bolt 13 protrudes from the upper surface of the second-stage spiral flow guide member. In FIG. 5, in order to facilitate the illustration, the first-stage spiral flow guide member 12 and the second-stage spiral flow guide member 12 are separated from each other, and the shaft portion of the bolt 13 is drawn longer than it actually is.
By doing so, the first-stage spiral flow guide member and the second-stage spiral flow guide member are arranged so as to form a predetermined angle around the central column.

Then, as shown in FIG. 6A, the nut 14 is screwed into the threaded portion of the bolt 13 protruding from the upper surface of the second-stage spiral flow guide member to form the first-stage spiral flow guide member and the second-stage spiral flow guide member. The spiral flow guide member can be tightened.
In order to bring the lower surface of the first-stage spiral flow guide member 12 into contact with the upper surface of the invert 7 or the bottom slab 4, as shown in FIG. 6A, the head of the bolt 13 stably installs the spiral flow guide member. Therefore, it is possible to prevent the spiral flow guide member of the first stage from popping out from the lower surface.

By tightening with bolts and nuts, the two spiral flow guide members 12 (that is, the first-stage and second-stage spiral flow guide members) can be integrated and prevented from shifting from each other. The two spiral flow guide members are also supported by the core column 11 inserted through the core column insertion hole 123, and the outer peripheral side portion of the outer end portion 122 of the spiral flow guide member is the inner wall of the manhole skeleton 2. Since it is in close proximity to or in contact with the manhole, it is surely arranged in a spiral shape in the manhole in a rigid state centered on the Shinbashira, and the first and second steps of the spiral flow guide path are formed around the Shinbashira. ..
At this time, it is desirable that the side portion of the first-stage spiral flow guide member 12 on the step nose side 125 is arranged so as to be substantially opposed to the entrance of the outflow pipe 6. By doing so, the inflow water flowing down the spiral flow guide path is quickly discharged to the outflow pipe 6 after flowing down the first-stage spiral flow guide member 12.

Similarly, the third-stage spiral flow guide member 12 is inserted into the core column 11 so that the center column 11 is inserted into the center column insertion hole 123 of the spiral flow guide member from the upper end of the erected core column 11. Install and stack on the second stage spiral flow guide member. Then, as shown in FIG. 2, the bolt insertion hole 124 formed in the step tail portion of the outer end portion of the second-stage spiral flow guide member and the nose portion of the outer end portion of the third-stage spiral flow guide member. The third-stage spiral flow guide member is arranged on the second-stage spiral flow guide member so as to overlap with the bolt insertion hole 124 formed in the above, and then the lower surface of the second-stage spiral flow guide member. Then, the bolt 13 is inserted through the bolt insertion hole 124 of the second-stage spiral flow guide member, and is inserted into the bolt insertion hole 124 of the third-stage spiral flow guide member until the upper end of the shaft portion of the bolt 13 protrudes. Then, the nut 14 can be screwed into the threaded portion of the bolt 13 protruding from the upper surface of the third-stage spiral flow guide member to tighten the second-stage spiral flow guide member and the third-stage spiral flow guide member. ..

In this way, the two spiral flow guide members (that is, the second-stage and third-stage spiral flow guide members) can be integrated and prevented from shifting from each other, and the two spiral flow guide members can be formed. It is also supported by the core column 11 inserted through the core column insertion hole 123, and the outer peripheral side portion of the outer end portion 122 of the spiral flow guide member is in close proximity to or in contact with the inner wall of the manhole skeleton 2, so that one step is provided. The spiral flow guide members from the eyes to the third stage are surely arranged spirally around the central pillar.

Similarly, for the spiral flow guide member from the fourth stage to the uppermost stage, the spiral flow guide member 12 can be assembled in a spiral shape around the core column 11 centering on the core column 11.
Therefore, in the spiral flow guide path 10 of the present invention, the spiral flow guide member of the nth stage (n is an integer) located on the lower side and the spiral flow guide member of the (n + 1) stage located on the upper side thereof, which are adjacent to each other. Is a bolt insertion hole 124 formed in the nose of the outer end of the (n + 1) th-stage spiral flow guide member located on the upper side and the outer end portion of the n-th stage spiral flow guide member located on the lower side. The bolt insertion holes 124 formed in the step tail portion of the bolt are arranged so as to overlap each other, and are adjacent to each other by the bolt 13 inserted into the two overlapping bolt insertion holes and the nut 14 screwed into the shaft portion of the bolt. The spiral flow guide member of the nth stage and the (n + 1) stage is sandwiched and tightened.

In FIG. 2, the spiral flow guide members up to the fourth stage are arranged in a spiral shape, and the spiral flow guide members 12 from the first stage to the fourth stage use three bolts 13 (not shown). A spiral flow guide path arranged in a spiral shape is shown.

When the two adjacent spiral flow guide members are tightened with bolts and nuts between the second stage to the uppermost spiral flow guide members, the form shown in FIG. 6A may be used, but as can be seen from FIG. Since a space is created below the lower surface of the spiral flow guide member on the second and subsequent stages on the step tail side, the lower nut and the lower end of the bolt protrude from the lower surface of the spiral flow guide member, as shown in FIG. 6 (b). It may be.
Further, when tightening the adjacent spiral flow guide members with bolts and nuts between the second stage to the uppermost spiral flow guide member, as shown in FIG. 6, the spiral flow guide member having the bolt 13 located on the lower side is used. The bolt was inserted into the bolt insertion hole 124 from below, but the bolt was inserted into the bolt insertion hole 124 from the upper surface of the spiral flow guide member located on the upper side, and the bolt 13 protruding from the lower surface of the lower spiral flow guide member. The shaft portion of the above may be tightened with a nut 14 to integrate the spiral flow guide members adjacent to the top and bottom.

The spiral flow guide member 12 is attached by inserting the core pillar 11 into the core pillar insertion hole 123 at the inner end of the spiral flow guide member at the upper end of the erected core pillar 11. If it is high, it may be difficult to attach the spiral flow guide member. In the spiral flow guide path of the four-stage spiral flow guide member shown in FIG. 2, the height of the core column 11 is not so large, but the center column 11 also increases as the number of stages of the spiral flow guide member 12 increases.
In such a case, the core pillars are not integrated, but can be divided into split types as described above.
If the split type is used, a predetermined number of spiral flow guide members are attached to the core column, and as described above, a spiral flow guide path for a predetermined number of spiral flow guide members is constructed, and then the spiral flow guide path is climbed. , A split type core column may be added, and a predetermined number of spiral flow guide members may be attached.

Since the central column 11 is hollow, a lid (not shown) is attached to the uppermost end of the central column to close it by screwing it into the inner wall of the central column so that inflow water does not enter from the uppermost end. It is desirable that a flange portion is formed on the lid to cover the upper end surface of the peripheral wall of the core column insertion hole 123 of the spiral flow guide member arranged at the uppermost stage.

The assembly procedure for installing the spiral flow guide path in the manhole is not limited to the above. For example, a spiral flow guide member is inserted into a central pillar on the ground, adjacent spiral flow guide members are tightened with bolts and nuts, a spiral flow guide path is assembled, and the spiral flow guide path is lowered into a manhole. It can also be installed.

In the spiral flow guide path of this embodiment, the spiral flow guide member 12 has the core pillar 11 inserted into the core pillar insertion hole 123, and the adjacent upper and lower spiral flow guide members 12 are fastened to each other by fastening the bolt 13 and the nut 14. Since it is integrated, the spiral flow guide can be installed in the manhole in a firm and stable state.
Further, by changing the position of the bolt insertion hole 124 in the direction along the outer circumference of the outer end portion 122 of the spiral flow guide member, the overlapping width between the upper and lower spiral flow guide members adjacent to each other can be changed, and the spiral flow can be changed. The turning angle of the guideway can also be easily adjusted.

The spiral flow guide member 12 shown in FIG. 4 has a constant thickness and is solid. It is also possible to provide a rib material integrally with the plate-shaped body on the back surface of the body edge portion, and form a height as a spiral flow guide member by the thickness of the plate-shaped portion and the height of the rib material. Further, in order to increase the strength of the spiral flow guide member 12, the rib material may be provided not only on the back surface of the edge portion of the plate-shaped body but also on the back surface of the central portion of the plate-shaped body.
Further, the spiral flow guide member 12 is made of a material having sufficient strength as a spiral flow guide member and having corrosion resistance. For example, it may be made of a metal such as aluminum, but in order to reduce the weight, it is desirable to manufacture it from a foam made of an outer skin and a foam core material. A schematic cross-sectional view of the spiral flow guide member 12 made of this foam is shown in FIG.

The foam 16 is a foam core material 161 whose inside is made of foamed resin, and the outer skin 162 covers the foam core material 161. By a method such as a blow molding method or a vacuum impregnation method, the outer skin 162 and the foam core material 161 Can be integrated and manufactured.
As the foam core material 161, a foamable polystyrene resin, a plant-derived polylactic acid-based foamable resin, or the like can be used. Further, although a synthetic resin such as polyethylene or polypropylene can be used for the outer skin 162, a fiber reinforced plastic material (FRP) having high strength is preferable.
The spiral flow guide member described above, which is composed of a plate-shaped body and a rib material integrally provided on the back surface of the plate-shaped portion, is also manufactured from the foam 16 made of the foam core material 161 and the outer skin 162. be able to.

The foam 16 has low strength only with the foam core material 161. However, by integrating the foam core material 161 with the outer skin 162, the strength is dramatically improved, and the load resistance, durability, and water resistance are improved. Is excellent. Further, since the foam core material 161 occupies most of the volume, it is lightweight. Therefore, it is possible to assemble the spiral flow guide path by stacking the spiral flow guide members 12 around the central pillar 11 without using a large-scale heavy machine.

In the spiral flow guide member 12 made of the foam 16, the outer skin 162 can also be formed on the inner peripheral surfaces of the core column insertion hole 123 and the bolt insertion hole 124, but the foam core material 161 and the outer skin 162 are integrated. In the process of performing, a sleeve having the same length as the thickness of the spiral flow guide member 12 and an inner diameter of the same size as the outer diameter of the shaft portion of the core column 11 and the bolt 13 is previously inserted into the core column insertion hole 123 and the bolt, respectively. It can also be arranged at the site of the insertion hole 124 to integrate the outer skin and the foam core material together with the sleeve. By doing so, each of the core column insertion hole 123 and the bolt insertion hole 124 can be formed into a foam with high accuracy in the dimensions of the outer diameters of the core column 11 and the shaft portion of the bolt. In this case, since the sleeve is attached to the inner peripheral surfaces of the core column insertion hole 123 and the bolt insertion hole 124, the foam core material is not exposed.

As the bolt 13 and the nut 14, a steel material, an aluminum alloy material, or the like can be used, but in order to further reduce the weight, those made of synthetic resin can also be used as in the core column 11. Fiber reinforced plastic material is also suitable as a synthetic resin in terms of strength. Synthetic resin products are also water resistant because they do not corrode due to rust.

The inflow water flowing in from the inflow port (inflow pipe 5) at the upper part of the manhole skeleton is guided by the spiral flow guide member 12 of the spiral flow guide path 10 and flows down in a spiral shape, and at the same time, the water force is attenuated by stepping. , It is discharged from the outflow port (outflow pipe 6) at the bottom of the manhole. In addition, this spiral flow guide path can be used as a staircase for raising and lowering workers and the like, and inspection work and maintenance management work in the manhole can be easily performed.

The work of assembling the spiral flow guide path in the manhole is also performed by arranging the spiral flow guide member 12 around the core column 11 and fastening the adjacent spiral flow guide member 12 with bolts and nuts. The structure of the road is not complicated, the spiral flow guide path can be easily constructed in the manhole, and it can be constructed without using a large-scale heavy machine.

Although the spiral flow guide member having a constant thickness is shown in FIGS. It is also possible to use the spiral flow guide member 12 inclined to.
As can be seen from FIG. 8B, by constructing the spiral flow guide path using such a spiral flow guide member, the inflow water does not stay on the upper surface of the spiral flow guide member 12, and the spiral flow guide member does not stay. It becomes easier for the inflow water to flow down from.
In this figure, the inclination angle is drawn large to about 10 ° in order to emphasize the inclination, but the effect is exhibited even at about 1 to 5 °. At this level, there is no problem in raising and lowering workers.
In this embodiment shown in FIG. 8, not only the upper surface of the spiral flow guide member but also the side surface on the nose side is not vertical, and the lower portion of the side surface projects and inclines toward the front side. By doing this, the step flow of the inflow water can be made gentler.
A spiral flow guide member whose upper surface is inclined downward toward the step nose at a portion of the spiral flow guide member on the nose side can also be manufactured from the foam 16 shown in FIG. 7.

When using the spiral flow guide member shown in FIGS. 2 to 5 and 8, a spiral flow guide path was constructed by tightening adjacent spiral flow guide members with bolts and nuts, but unlike this, bolts and nuts are used. The spiral flow guide path of the embodiment is described with reference to FIGS. 9 to 11 below.

As shown in FIGS. 9 and 10, the spiral flow guide member 12 used for the spiral flow guide path of this embodiment is also inserted into the inner end portion 121 in the same manner as the conventional spiral flow guide member. A hole 123 is formed, and a central column 11 is inserted into this hole and arranged spirally around the central column 11 to construct a spiral flow guide path 10 (see FIG. 11).

As can be seen from FIG. 9, a step portion 127 is formed at a portion of the spiral flow guide member 12 on the step tail portion side, and the upper surface of the step portion 127 is higher than the upper end surface of the peripheral wall of the core column insertion hole 123. It has become.
On the other hand, the lower surface (back surface) of the portion of the spiral flow guide member 12 on the nose side has a portion formed to be thinner by the amount of the step 127, and in that portion, the portion on the nose side is formed. The lower surface is higher than the lower end surface of the peripheral wall of the core column insertion hole 123, and a space having the same three-dimensional shape as the step portion 127 is formed under the portion of the spiral flow guide member 12 on the nose portion side (FIG. 10).
Further, the upper surface of the portion of the spiral flow guide member 12 on the step nose side portion may have a surface lower than the step portion 127 of the portion on the step tail portion side. It is the same height as the upper end surface of.

As can be seen from FIG. 10, the spiral flow guide member 12 of this embodiment also has a substantially fan shape in a plan view, and the step portion 127 has a substantially rectangular shape. Then, in a state where the core column 11 is inserted into the core column insertion hole 123 of the spiral flow guide member, the outer peripheral side portion of the outer end portion 122 has a dimension of approaching or contacting the inner wall of the manhole skeleton 2. ..

Therefore, the two spiral flow guide members 12 are stacked around the erected core column 11 by inserting the center column 11 into the center column insertion hole 123, and the spiral flow guide member located on the upper side is on the nose side. The step portion formed on the step tail portion side of the spiral flow guide member located on the lower side is housed on the lower surface of the portion, and is located on the nose portion and the lower side of the spiral flow guide member located on the upper side. It is possible to superimpose the step tail portion of the spiral flow guide member.
Similarly, when the spiral flow guide members 12 are further stacked around the core column 11, as can be seen from FIG. 11, the spiral flow guide members 12 located on the lower side of the upper and lower spiral flow guide members adjacent to each other. The step portion 127 formed on the portion on the step tail portion side can be stored in the space on the lower surface of the portion on the step nose portion side of the spiral flow guide member 12 adjacent to the upper side, and the spiral flow guide is centered on the central column 11. The members can be arranged in a spiral.
Further, by changing the width dimension and shape of the step portion 127, the overlapping width of the upper and lower spiral flow guide members adjacent to each other can be changed, and the turning angle of the spiral flow guide path can be easily adjusted.

An example of a procedure for assembling the spiral flow guide path 10 using the spiral flow guide member shown in FIG. 9 in the manhole 1 will be described below.
First, the pillar 11 is erected in the manhole.
The method of erection of the central pillar 11 on the manhole invert or the bottom slab is the same as in the case of the spiral flow guide path using the spiral flow guide member shown in FIGS. 2 to 5.

Next, the spiral flow guide member 12, which is the first stage of the spiral flow guide path 10, is inserted from the upper end of the erected core column 11 into the core column insertion hole 123 of the spiral flow guide member. And attach it to the core 11. Subsequently, the second-stage spiral flow guide member 12 is attached to the core column 11 in the same manner.

Then, the step portion 127 formed on the portion on the step tail portion side of the first-stage spiral flow guide member is stored on the lower surface (back surface) of the portion on the step nose portion side of the second-stage spiral flow guide member, and 1 The second-stage spiral flow guide member is stacked on the first-stage spiral flow guide member.
In FIG. 11, when going up the spiral flow guide path, the second-stage spiral flow guide member is in the direction opposite to the movement of the clock hand around the central pillar with respect to the first-stage spiral flow guide member. It is arranged in a state of being rotated by a predetermined angle.

By doing so, the first-stage spiral flow guide member and the second-stage spiral flow guide member form a predetermined angle around the central column, and form a nose portion of the spiral flow guide member located on the upper side. It will be arranged so as to overlap the step tail portion of the spiral flow guide member located on the lower side.

Similarly, for the spiral flow guide member from the third stage to the uppermost stage, the spiral flow guide member 12 can be assembled around the core column 11 in a spiral shape with the core column 11 as the center in the same procedure.
Therefore, the n-th stage (n is an integer) spiral flow guide member located below the spiral flow guide paths vertically adjacent to each other and the (n + 1) stage spiral flow guide member located above the n-th stage spiral flow guide member are below. The step portion 127 formed on the step tail portion side of the nth step spiral flow guide member located on the side is housed on the lower surface of the step nose side portion of the (n + 1) step spiral flow guide member, and n In a state where the upper surface of the step portion 127 of the stepped spiral flow guiding member and the lower surface of the portion of the (n + 1) step spiral flow guiding member on the step nose side are in contact with each other, the nth step spiral flow guiding member and ( The n + 1) stage spiral flow guide members are stacked around the core column (see FIG. 11).
As the uppermost spiral flow guide member, a member whose upper surface is flush with no stepped portion can also be used.

In the spiral flow guide path 10 constructed by the spiral flow guide member 12 having the step portion 127, the spiral flow guide path 10 is formed at a portion on the step tail portion side of the spiral flow guide member located below the spiral flow guide members vertically adjacent to each other. The stepped portion is housed in a space formed on the lower surface of the part on the nose side of the spiral flow guide member located on the upper side, and the upper surface of the step portion and the side surface on the step tail portion side are located on the upper side. Since the spiral flow guide members are stacked, and each spiral flow guide member 12 is also supported by the core column 11, and the outer peripheral portion is close to or in contact with the inner wall of the manhole 1. , Can be erected firmly and stably in the manhole.

In the manhole where the spiral flow guide path of this embodiment is installed, the inflow water flowing in from the upper part is guided by the spiral flow guide member 12 of the spiral flow guide path 10 and flows down in a spiral shape and flows in a step. The water force is dampened and discharged from the outlet (outflow pipe 6) at the bottom of the manhole (see FIG. 1). Further, the spiral flow guide path 10 can be used as a staircase for raising and lowering a worker or the like, and inspection work and maintenance management work in the manhole can be easily performed.

In the work of assembling the spiral flow guide path in the manhole, the core column 11 is inserted into the core column insertion hole 123 of the spiral flow guide member, the spiral flow guide member 12 is arranged around the core column 11, and the spiral flow guide member 12 is adjacent to the center column 11. The spiral flow guide member 12 is provided in a space formed on the lower surface of the step portion on the step tail portion side of the spiral flow guide member located on the lower side and on the lower surface of the step portion on the step nose side portion of the spiral flow guide member located on the upper side. Since the spiral flow guide path is stored and stacked, the structure of the spiral flow guide path is not complicated, the spiral flow guide path can be easily constructed in the manhole, and it can be constructed without using a large-scale heavy machine. Can be done.

In FIGS. 9 to 11 above, a step portion is formed at a portion on the step tail portion side of the spiral flow guide member, and when the spiral flow guide members are stacked, the two spiral flow guide members adjacent to each other are placed on the lower side. The spiral flow guide path housed on the lower surface of the step portion of the spiral flow guide member located on the upper side of the step portion on the step nose side of the spiral flow guide member has been described. A groove is formed in the step portion formed in the above, and a protrusion is formed on the lower surface of the portion of the spiral flow guide member on the nose side, and when the two spiral flow guide members are stacked, the spiral flow guide member located on the lower side is formed. Regarding the embodiment of the spiral flow guide path in which the protrusion on the lower surface of the portion on the step nose side of the spiral flow guide member located on the upper side is fitted in the groove of the step portion on the step tail portion side of the above The explanation will be based on.

As shown in FIGS. 12 and 13, the spiral flow guide member 12 used for the spiral flow guide path of this embodiment also has a central column inserted into the inner end portion 121, similarly to the conventional spiral flow guide member. A hole 123 is formed, and a central column 11 is inserted into this hole and arranged spirally around the central column 11 to construct a spiral flow guide path 10 (see FIG. 14).
The spiral flow guide member 12 of this embodiment also has a substantially fan shape in a plan view. Then, in a state where the core column 11 is inserted into the core column insertion hole 123 of the spiral flow guide member, the outer peripheral side portion of the outer end portion 122 has a dimension of approaching or contacting the inner wall of the manhole skeleton 2. ..

Then, as shown in FIG. 12, a step portion 127 is formed at a portion of the spiral flow guide member 12 on the step tail portion side, as in the case of FIG. 9, and the upper surface of the step portion 127 is formed. It is higher than the upper end surface of the peripheral wall of the core column insertion hole 123. The stepped portion shown in this figure is smaller in thickness than the stepped portion shown in FIG.
The portion 128 on the nose side of the spiral flow guide member of this embodiment may have a flat surface portion lower than the height of the step portion 127, as shown in FIG. 9, but in FIG. 12, the nose side may be formed. It is inclined downward toward the height of the lower end surface of the core column insertion hole 123.
At least one or more grooves 127'are formed on the upper surface of the step portion 127. It is desirable that the groove 127'is provided at a position closer to the nose side. In FIG. 12, two grooves are formed on the edge of the step portion 127 on the step nose side. In this case, the edge 128'on the step end side of the portion of the spiral flow guide member 12 on the step nose side is formed. It forms a part of the side surface of the groove.

On the other hand, as can be seen from FIG. 13, the lower surface (back surface) of the portion of the spiral flow guide member 12 on the step nose side has a portion formed to be thinner by the amount of the step portion 127, and in that portion, the thickness is formed. Similar to the one shown in FIG. 9, the lower surface of the portion on the nose side is higher than the lower end surface of the peripheral wall of the core column insertion hole 123 (drawn low in FIG. 13), and the spiral flow guide member 12 A space having the same three-dimensional shape as the step portion 127 (excluding the groove portion) is formed under the portion on the nose portion side of the spiral flow guide member, and the step portion 127 is stored on the lower surface of the portion on the step nose side of the spiral flow guide member. A recess 129 that can be formed is formed.
At least one protrusion 129'is formed in the recess 129. In FIG. 12, two protrusions 129'are formed on the edge of the recess 129 on the nose side.
The above-mentioned protrusion 129'is formed in a shape that fits into the groove 127', and the two spiral flow guide members 12 are placed in the recesses 129 on the lower surface of the portion of the spiral flow guide member located on the upper side on the nose side. , When the step portion 127 formed on the step tail portion side portion of the spiral flow guide member located on the lower side is stored and stacked, the lower surface (back surface) of the step portion side portion of the spiral flow guide member located on the upper side. The protrusion 129'formed in the recess 129 of the above is arranged so as to fit into the groove 127' of the step portion formed in the portion on the step tail portion side of the spiral flow guide member located on the lower side.

In addition, on the lower surface (back surface) of the portion of the spiral flow guide member 12 on the step tail portion side shown in FIG. 13, a part of the portion is surrounded by the wall surface to form a cavity. For this reason, a cavity may be provided on the step tail side of the spiral flow guide member 12, or it may be solid.

Therefore, as shown in FIG. 14, the two spiral flow guide members 12 are stacked around the erected core column 11 by inserting the core column 11 into the core column insertion hole 123, and are vertically adjacent to each other. The spiral flow guide member is formed in a recess 129 formed on the lower surface of the portion on the nose side of the spiral flow guide member 12 located on the upper side, and on a portion on the step tail portion side of the spiral flow guide member 12 located on the lower side. In addition to accommodating the stepped portion 127, the stepped portion 127 of the portion on the step tail portion side of the spiral flow guiding member whose protrusion 129'formed in the recess 129 of the spiral flow guiding member located on the upper side is located on the lower side. It can be overlapped in a state of being fitted in the groove 127'formed in.

The height of the edge 128'on the step tail side of the portion of the spiral flow guide member on the step nose side does not have to exceed the height of the step portion 127, but the edge 128'shown in FIG. 12 is a step. It is higher than the edge of the portion 127 on the nose side. In this case, in the spiral flow guide member adjacent to the top and bottom, the step nose portion of the spiral flow guide member 12 in which the edge 128'on the step tail portion side of the portion of the spiral flow guide member 12 located on the lower side is located on the upper side. It will come into contact with the edge of the side part on the nose side.

Similarly, when the spiral flow guide members 12 are further stacked around the core column 11, as can be seen from FIG. 14, the spiral flow guide members 12 located on the lower side of the upper and lower spiral flow guide members adjacent to each other. The step portion 127 formed in the portion on the step tail portion side can be housed in the recess 129 on the lower surface of the portion on the step nose portion side of the spiral flow guide member 12 adjacent to the upper side, and the spiral flow is centered on the central column 11. The guide members 12 can be arranged in a spiral shape.
As shown in FIG. 14, the step portion 128'on the step tail portion side of the portion on the step nose side of the spiral flow guide member is the step portion by the thickness of the edge on the step nose side of the portion on the step nose side of the spiral flow guide member. If it is made higher than the height of the edge on the nose side of 127, the edge 128'can be prevented from protruding when the spiral flow guide path 10 is constructed.

In the spiral flow guide path 10 of this embodiment, the step portion 127 formed on the step tail portion side of the spiral flow guide member 12 located below the spiral flow guide members adjacent to each other vertically is located on the upper side. It is housed in a recess 129 formed on the lower surface (back surface) of the nose portion of the flow guide member 12, and the upper surface of the step portion 127 and the side surface on the step tail portion side are supported by the spiral flow guide member located on the upper side. Further, the spiral flow guide members are stacked in a state where the protrusion 129'of the recess is fitted in the groove 127' of the step portion, and each spiral flow guide member 12 is also supported by the manhole 11. Since the outer peripheral portion is close to or in contact with the inner wall of the manhole 1, it can be erected firmly and stably in the manhole.
Since the spiral flow guide members are stacked in this way to form the spiral flow guide path, the spiral flow guide path of this embodiment is not complicated in structure, and the spiral flow guide path is constructed in the manhole. Can be easily done and can be constructed without the use of large-scale heavy machinery.

Even in the manhole 1 in which the spiral flow guide path of this embodiment is installed, the inflow water flowing in from the inflow port (inflow pipe 5) at the upper part of the manhole is guided by the spiral flow guide member 12 of the spiral flow guide path 10 and spirals. The water force is dampened by spirally flowing down the portion 128 on the nose side of the flow guide member, and is discharged from the outflow port (outflow pipe 6) at the lower part of the manhole. Further, in the spiral flow guide path 10, the inclined portion on the nose portion side of the spiral flow guide member forms a continuous surface, but if the inclination on the nose portion side of the inclined portion is made gentle, it can be used for raising and lowering the worker. It can be used, and inspection work and maintenance work in the manhole can be easily performed.

In this embodiment, as the spiral flow guide member 12, as shown in FIG. 12, a member whose portion on the nose side is inclined downward is used, but the present invention is not limited to this, and the plane is lower than the step portion 127. Those having a part can be used. For example, as shown in FIG. 9, the portion of the spiral flow guide member on the nose side may have a flat upper surface lower than the step portion 127. Further, as shown in FIG. 15, the portion 128 on the nose side of the spiral flow guide member has an inclined surface at a portion near the outer end, but the other portion has a flat surface portion lower than the step portion 127. It may have. In the spiral flow guide path 10 (not shown) constructed from such a spiral flow guide member, the inflow water flows in a stepped manner at a portion connected in a staircase pattern, and flows downward while attenuating the momentum. ..

The procedure for assembling the spiral flow guide path 10 using the spiral flow guide member shown in FIGS. 12 and 15 is substantially the same as that of the spiral flow guide path shown in FIG.

FIG. 16 shows different embodiments of the spiral flow guide member 12 having the step portion 127.
The spiral flow guide member 12 is provided with a gutter-shaped member 17 having a semicircular cross section at the outer end portion, and is inclined downward from the step tail portion to the step nose portion.
The end face of the gutter-shaped member 17 on the step tail side is in close contact with the end face of the gutter-shaped member 17 on the nose side of the spiral flow guide member 12 adjacent to the upper side, and the end face of the gutter-shaped member 17 on the step nose side. The end faces are formed so as to be in close contact with the end faces of the gutter-shaped member 17 on the step tail portion side of the spiral flow guide member adjacent to the lower side so that the inflow water does not leak. When the spiral flow guide member 12 is arranged in the core column 11 via the core column insertion hole 123, the outer circumference of the rain gutter-shaped member 17 is sized to be close to or in contact with the inner wall of the manhole.

Therefore, after the spiral flow guide members 12, 12, ... Are stacked in a spiral shape, as shown in FIG. 17, a spirally continuous ramp is formed on the outer peripheral portion of the spiral flow guide path 10. ..
The inflow water flowing from the upper part of the manhole 1 spirally flows along the ramp formed by the spiral flow guide path 10 and the gutter-shaped member 17.
The lower end of the gutter-shaped member 17 of the first-stage spiral flow guide member may be directed toward the outflow pipe 6. Since the inflow water flowing down the ramp flows in a sloped direction and reaches the outflow pipe 6, the impact on the manhole wall and the bottom of the manhole can be reduced.
The gutter-shaped member 17 can also be provided on other spiral flow guiding members shown in the present specification.

Although the spiral flow guide member having the step portion 127 and the spiral flow guide member 12 having the rain gutter-shaped member 17 can be manufactured of a material having sufficient strength and corrosion resistance, for example, a metal such as aluminum. , Can be made of foam 16 (see FIG. 7). Further, the upper surface of the spiral flow guide member body excluding the peripheral wall of the core column insertion hole 123 is made into a plate-like body, and a rib material is integrally provided on the back surface of the plate-like body edge portion with the plate-like body to form a plate shape. The height of the spiral flow guide member can also be formed by the thickness of the portion and the height of the rib material.

Further, similarly to the spiral flow guide member shown in FIG. 8, the spiral flow guide member 12 having the step portion 127 shown in FIGS. 9 and 16 also has an inclined upper surface of about 1 to 5 ° at the portion on the nose portion side. It is also possible to use the spiral flow guide member 12 whose thickness is gradually reduced from the step tail side to the step nose side. At this level, there is no problem in raising and lowering workers.

Even in the spiral flow guide path constructed of the spiral flow guide member having the above stepped portion 127, the core column 11 is hollow, so that the core is at the uppermost end of the core column so that the inflow water does not enter from the uppermost end. It can be closed by attaching a lid (not shown) by screwing it to the inner wall of the pillar. Further, by forming a flange portion on the lid body and covering the upper end surface of the peripheral wall of the core pillar insertion hole 123 of the spiral flow guide member arranged at the uppermost stage, the spiral flow guide member 12 can be moved from the core pillar 11. It is possible to prevent withdrawal.

As the number of stages of the spiral flow guide member 12 increases, the core column 11 also becomes higher, but as described above, as in the case of the spiral flow guide path composed of the spiral flow guide members shown in FIGS. 2 to 5, as described above. It is possible to deal with it by making the central pillar a split type instead of an integrated one.

As in the case of the spiral flow guide path composed of the spiral flow guide members shown in FIGS. 2 to 5, the core column 11 can be made of a steel material, an aluminum alloy material, or the like, but the weight is further reduced. Therefore, it is desirable to use one made of synthetic resin, and fiber reinforced plastic material (FRP) is also suitable in terms of strength.
Further, the core column 11 can also be a split type here as in the case of the spiral flow guide path composed of the spiral flow guide members shown in FIGS. 2 to 5.

In the present invention, the spiral flow guide member can be manufactured so that the outer peripheral side portion of the outer end portion 122 has a dimension of being close to or in contact with the inner wall of the manhole to construct the spiral flow guide path. A large spiral guide path can be easily manufactured.

The above embodiment of the present invention has been described when the vertical pipe is a manhole. However, the spiral flow guide path is constructed not in the vertical pipe but in a vertical pipe made of synthetic resin or a vertical pipe made of steel, for example. The present invention can also be applied to a vertical pipe for reducing the force of falling inflow water. Similar to the invention described in Patent Document 1, it is also possible to install a vertical pipe made of synthetic resin in which a spiral flow guide path is constructed in the manhole to reduce the water force of the inflow water from the upper part of the manhole. ..

The spiral flow guide path in the present invention can be installed by working in a manhole as a vertical pipe, and a guide flow path for inflow water can be easily installed in an existing manhole. Therefore, in this case, since the spiral flow guide path can be installed in the existing manhole without newly constructing the manhole, the manhole provided with the spiral flow guide path can be manufactured at low cost.

1: Manhole 2: Manhole skeleton 3: Manhole lid 4: Manhole bottom plate 5: Inflow pipe 6: Outflow pipe 7: Invert 8: Step 10: Spiral flow guide path 11: Core pillar 12: Spiral flow guide member 121: (Spiral) Inner end (of the spiral guide member) 122: Outer end (of the spiral guide member) 123: Center column insertion hole 124: Bolt insertion hole 125: Nose part (of the spiral flow guide member) 126: (Spiral flow guide) Step tail portion 127: Step portion 127 ′ formed on the step tail portion side portion of the spiral flow guide member: Groove 128 formed on the step portion 127: Step nasal portion side portion 128 ′ of the spiral flow guide member : Edge on the step tail side of the portion 128 129: Recessed portion formed on the lower surface (back surface) of the step nose side portion of the spiral flow guide member 129': Protrusion formed on the recess 129 13: Bolt 14: Nut 15: Core for erection of core pillar 16: Foam 161: Foam core 162: Outer skin 17: Rain girder-shaped member

Claims (6)

The spiral flow guide member in which the hole for inserting the central column is formed is arranged in a spiral shape around the vertical column, which is a hollow cylindrical body inserted into the hole for inserting the central column. It is a vertical pipe equipped with a spiral flow guide path.
Bolt insertion holes are formed in the nose and buttock at the outer end of the spiral flow guide member.
The spiral flow guide members adjacent to each other are such that the nose portion of the spiral flow guide member located on the upper side and the step tail portion of the spiral flow guide member located on the lower side overlap each other, and the spiral flow guide member located on the upper side The bolt insertion hole formed in the nose of the outer end and the bolt insertion hole formed in the outer end of the spiral flow guide member located on the lower side are arranged so as to overlap each other.
It characterized in that it tightened across the two spiral flow guide member adjacent to each other by the inserted bolt and nut to the two overlapping bolt insertion holes, vertical tube with a screw-swirl guide path. The spiral flow guide member in which the hole for inserting the central column is formed is arranged in a spiral shape around the vertical column, which is a hollow cylindrical body inserted into the hole for inserting the central column. It is a vertical pipe equipped with a spiral flow guide path.
A step portion is formed on the step tail portion side of the spiral flow guide member, the upper surface of the step portion is made higher than the upper end surface of the peripheral wall of the core column insertion hole, and the step portion side portion of the member is the step portion. It is formed as thin as the thickness of the step, and the lower surface of the part on the nose side is made higher than the lower end surface of the peripheral wall of the shinbashira insertion hole.
The spiral flow guide members adjacent to each other are such that the nose portion of the spiral flow guide member located on the upper side and the step tail portion of the spiral flow guide member located on the lower side overlap each other, and the spiral flow guide member located on the upper side A vertical pipe provided with a spiral flow guide path, characterized in that a step portion formed on a portion on the step tail portion side of a spiral flow guide member located on the lower side is housed on the lower surface of the portion on the nose portion side. A groove is formed in the step portion formed on the step tail portion side of the spiral flow guide member, and a protrusion is formed on the lower surface of the step nose portion side portion of the spiral flow guide member so as to be adjacent to each other. In the spiral flow guide member, the protrusion on the lower surface of the step portion of the spiral flow guide member located on the upper side is fitted into the groove of the step portion of the portion on the step tail portion side of the spiral flow guide member located on the lower side. The vertical pipe provided with the spiral flow guide path according to claim 2, wherein the vertical pipe is provided. The spiral flow guide member according to any one of claims 1 to 3 , wherein the upper surface of the portion on the nose portion side is inclined in a downward direction from the tail portion to the nose portion. A vertical pipe with a spiral flow guide path. The spiral flow guide member includes a gutter-shaped member at an outer end portion, and the gutter-shaped member is inclined in a downward direction from a step tail portion to a step nose portion, according to claims 1 to 1. A vertical pipe provided with the spiral flow guide path according to any one of 4. The vertical pipe provided with the spiral flow guide path according to any one of claims 1 to 5 , wherein the vertical pipe is a manhole.

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