JPH11172746A - Drop - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily install upper and lower spiral plates and to provide high support strength. SOLUTION: An upper spiral plate 6 is placed at the top of a drop shaft 5 taking the form of a vertical pipe having a water collecting pipe 2 connected to its top and a storage pipe 4 connected to its bottom, and the upper part of the line of contact between the outer peripheral part of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5 is welded by half of a turn to about one complete turn to form an upper welded part 23 on the outer periphery of the upper spiral plate. A lower spiral plate 10 is placed at the bottom of the drop shaft 5, and the lower part of the line of contact between the outer peripheral part of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5 is welded by half of a turn to about one complete turn to form a lower welded part 26 on the outer periphery of the lower spiral plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head work, and more particularly, to a head work capable of easily mounting an upper spiral plate and a lower spiral plate and obtaining high supporting strength. Things.

[0002]

2. Description of the Related Art In order to eliminate inundation damage caused by rainwater in urban areas, a part of rainwater during heavy rain is temporarily stored in a large-scale storage pipe provided underground, and when the water level of a river drops, An inundation countermeasure facility that pumps the water stored in the storage pipe and discharges it to the river is currently being planned.

[0003] In the above-mentioned inundation countermeasure facility, a 100-meter pipe is provided between a collecting pipe for collecting rainwater and a storage pipe provided deep underground.
Pipe facilities connecting high heads of up to 200 m are called head works, and head works such as those shown in FIGS. 5 and 6 are under study.

That is, a water collecting pipe 2 for sending water 1 such as rainwater separated by a water dividing facility or the like (not shown) is connected to the upper part,
A vertical drainage pipe having a lower side connected to a storage section such as an underground storage pipe 4 through an outflow pipe 3 and called a drop shaft 5 having an open upper end and a closed lower end is provided. And an upper spiral guideway 8 formed by disposing an upper spiral plate 6 and an upper central cylinder 7 whose upper and lower ends are open, and an intermediate opening 9 without a spiral plate is formed in an intermediate portion of the drop shaft 5, Further, a lower spiral plate 10 is provided below the drop shaft 5 to form a lower spiral guide path 11, thereby forming a head drop 12.

In the drawing, 13 is air, 14 is a water surface when the inflow of water 1 is small, 15 is a free water surface when the inflow of water 1 is large, and 16 is an axial center of the drop shaft 5. A central air vortex, 17 is an air suction vortex formed on the free water surface 15 or the water surface 14, and 18 is an orifice plate mounted on the upper halfway of the outflow pipe 3.

The lower spiral plate 10 has a vertical communication path 19 as shown in FIG. 6 formed at the center thereof so as to allow generation of the center air vortex 16.

[0007] Further, reference numeral 20 denotes a full-line weld of the inner periphery of the upper spiral plate between the inner peripheral portion of the upper spiral plate 6 and the outer peripheral surface of the upper central cylinder 7;
Reference numeral 21 denotes a welded portion between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, and reference numeral 22 denotes a portion between the outer peripheral portion of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5. This is the entire periphery of the lower spiral plate.

[0008] In the head work 12, when water 1 such as rainwater separated by a water separation facility (not shown) enters the drop shaft 5 through the water collecting pipe 2, first, the upper spiral guide path 8 forms an upper spiral plate. 6, and the intermediate opening 9
After being released from the spiral plate and being freely swung and dropped, the flow is regulated by the lower spiral plate 10 in the lower spiral guide path 11 and the excess energy is reduced, and then the outflow pipe 3 is discharged from the lower side of the drop shaft 5. It is sent to the storage pipe 4 underground through the reservoir and stored.

At this time, the upper end of the drop shaft 5 and the upper end of the upper central cylinder 7 are opened so as to communicate with the atmosphere to prevent the inside from becoming negative pressure.

Further, by forming an intermediate opening portion 9 without a spiral plate at an intermediate portion of the drop shaft 5, the cost of equipment is reduced.

Further, an orifice plate 18 is provided on the outflow pipe 3 to increase the pressure loss of the outflow pipe 3 so as to suppress the mixing of the air 13 into the water 1 and the outflow to the storage pipe 4.

As described above, by causing the water 1 to flow in a spiral shape, the energy of the fall is reduced, and the drop landing portion at the lower end of the drop shaft 5 is subject to vibration or damage due to impact or the like. Instead, a large amount of water 1 can be made to flow smoothly in a short time.

[0013]

However, the above-mentioned conventional head works have the following problems.

That is, when the upper spiral plate 6 and the lower spiral plate 10 are attached to the drop shaft 5 by welding, usually, the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5 are connected. The entire contact line between the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5 is similarly formed by welding the entire contact line between the outer peripheral portion of the upper spiral plate 10 and the inner peripheral surface of the drop shaft 5 in the same manner. It is conceivable that the lower spiral plate outer peripheral full line welded portion 22 is formed by welding with uniform strength.

However, as described above, the entire line of contact between the upper spiral plate 6 and the lower spiral plate 10 and the drop shaft 5 is welded with uniform strength, and the upper spiral plate outer peripheral full line weld 21 and the lower spiral plate outer peripheral full line weld are welded. When 22 is formed, welding work becomes difficult, and when the pitch of the upper helical plate 6 and the lower helical plate 10 is narrow or the diameter of the drop shaft 5 is small, welding may be difficult.

Further, the entire line of contact between the upper helical plate 6 and the lower helical plate 10 and the drop shaft 5 is welded with uniform strength to form an upper helical plate outer peripheral full line weld 21 and a lower helical plate outer peripheral full line weld 22. In such a case, there is a problem that the highest supporting strength is not always obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a head work in which an upper spiral plate and a lower spiral plate can be easily attached and high supporting strength can be obtained. .

[0018]

According to the present invention, an upper spiral plate 6 is provided on an upper part of a vertical tubular drop shaft 5 having a water collecting pipe 2 connected to an upper part and a storage part 4 connected to a lower part.
Of the contact lines between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, the upper portion is welded for about one round from half a circumference to form the upper spiral plate outer peripheral upper welded portion 23. It depends on the head that works.

Also, according to the present invention, an upper spiral plate 6 is disposed on a vertical tubular drop shaft 5 having a water collecting pipe 2 connected to an upper part and a storage part 4 connected to a lower part.
Of the contact lines between the outer peripheral portion of the lower shaft and the inner peripheral surface of the drop shaft 5, the upper portion is welded about half a turn to one turn to form the upper spiral plate outer peripheral upper welded portion 23, and The present invention is directed to a head work in which an upper spiral plate outer periphery lower welded portion 24 is formed by at least partially welding a range from a half circumference to one circumference of the lower portion.

Further, according to the present invention, a lower spiral plate 10 is disposed below a vertical tubular drop shaft 5 having a water collecting pipe 2 connected to an upper part and a storage part 4 connected to a lower part. The lower part of the contact line between the outer peripheral portion of the lower shaft and the inner peripheral surface of the drop shaft 5 is welded about half a turn to one turn to form a lower spiral plate outer peripheral lower welded portion 26. It depends on.

Also, according to the present invention, a lower spiral plate 10 is disposed below a vertical tubular drop shaft 5 having a water collecting pipe 2 connected to an upper part and a storage part 4 connected to a lower part. A part of the contact line between the outer peripheral portion of the lower shaft and the inner peripheral surface of the drop shaft 5 is at least partially welded in a range of about one half to one circumference of the upper portion to form a lower spiral plate outer peripheral upper welded portion 25. The lower part of the contact wire is welded for about one half turn to one turn to form a lower welded portion 26 on the outer periphery of the lower spiral plate.

In the present invention, a vertically extending spiral plate 29 is provided inside a vertical tubular drop shaft 5 having the water collecting pipe 2 connected to the upper part and the storage part 4 connected to the lower part. The upper part of the contact line between the outer peripheral part of the spiral plate 29 and the inner peripheral surface of the drop shaft 5 is welded by about one round from a half circumference to form a through spiral plate outer peripheral upper welded part 30. It depends on head work.

Further, according to the present invention, a through spiral plate 29 extending vertically is provided inside a vertical tubular drop shaft 5 having the water collecting pipe 2 connected to the upper part and the storage part 4 connected to the lower part. Of the contact lines between the outer peripheral portion of the spiral plate 29 and the inner peripheral surface of the drop shaft 5, the upper portion is welded for about one to a half turn to form the spiral plate outer peripheral upper welded portion 30 and the contact line is formed. Among them, the present invention is directed to a head work characterized in that at least a part of a range from a half circumference to one circumference of a lower portion is welded at least partially to form a lower peripheral welded portion 31 of a through spiral plate outer periphery.

According to the above means, the following effects can be obtained.

The water that has entered the drop shaft 5 from the water collecting pipe 2 is reduced in energy during the fall of the drop shaft 5 and is stored in the storage unit 4.

The difference in the static pressure acting on the upper and lower surfaces of the upper spiral plate 6 is large in the first turn, and the difference in the static pressure in other portions is small.

Therefore, of the contact lines between the outer peripheral portion of the upper helical plate 6 and the inner peripheral surface of the drop shaft 5, the upper portion having the largest static pressure difference is welded for about one half to one lap to form an upper peripheral portion of the upper helical plate. If the welded portion 23 is formed, sufficient supporting strength can be obtained.

In addition, of the contact line between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, a range of at least one round from a half circumference of the lower portion farthest from the upper portion to at least one round is provided. Partially welded upper spiral plate outer periphery lower welded part 24
Is formed, the support can be made at two places, so that a stronger support state can be obtained.

In addition, the above allows the upper spiral plate 6 to be easily attached at the same time.

The difference between the static pressures acting on the upper and lower surfaces of the lower helical plate 10 and the upper helical plate 6 is large in the final circumference, and the difference in the static pressure is small in other portions.

Therefore, of the contact line between the outer peripheral portion of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5, the lower portion having the largest static pressure difference is welded for about one to one round from the lower spiral plate to form an outer periphery. If the lower welding portion 26 is formed, a sufficient supporting strength can be obtained.

In addition, of the contact line between the outer peripheral portion of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5, a range of at least one round from a half circumference of the upper part farthest from the lower part is set. Partially welded lower spiral plate outer periphery upper welded part 2
By forming 5, it becomes possible to support at two places, so that a stronger supporting state can be obtained.

In addition, according to the above, the lower spiral plate 10 can be easily attached at the same time.

As described above, the upper spiral plate 6 and the lower spiral plate 1
By limiting the welding portion between the 0 and the drop shaft 5 to a portion effective for support, the upper spiral plate 6 and the lower spiral plate 10 can be easily attached.

When the drop of the tubular drop shaft 5 is small, a through spiral plate 29 extending vertically is disposed inside the tubular drop shaft 5, and the outer peripheral portion of the through spiral plate 29 and the drop shaft 5 Of the contact lines between the inner peripheral surface, the upper portion is welded about half a turn to one turn to form a through spiral plate outer peripheral upper welded portion 30, and further, if necessary, among the contact lines, At least a part of the lower part may be welded at least partially in a range from a half circumference to one circumference to form the lower welded portion 31 on the outer periphery of the through spiral plate.

As described above, by limiting the welding portion between the through spiral plate 29 and the drop shaft 5 to a portion effective for support, high support strength is obtained and the through spiral plate 29 is easily attached. Becomes possible.

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention.

The basic structure of the head work is shown in FIG.
6 are the same as those in FIG.

According to the present invention, of the contact line between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, the upper portion is welded for about one half turn to the outer peripheral upper weld portion 23 of the upper spiral plate. To form Then, if necessary, at least a part of the contact line between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5 is partially welded in a range from a half circumference of the lower part to one circumference. An upper spiral plate outer periphery lower welded portion 24 is formed.

Similarly, the lower part of the contact line between the outer peripheral part of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5 is welded for about one half turn to the lower peripheral part of the lower spiral plate outer peripheral lower welding part 26. To form And if necessary, the lower spiral plate 10
At least part of the contact line between the outer peripheral portion of the lower spiral plate and the inner peripheral surface of the drop shaft 5 is partially welded in a range of about one half to one revolution of the upper portion to form a lower spiral plate outer peripheral upper welded portion 25.

Reference numeral 27 denotes an upper spiral plate outer peripheral upper welding portion 23.
The upper spiral plate intermediate unwelded portion between the upper spiral plate outer peripheral lower weld portion 24 and the lower spiral plate outer peripheral lower weld portion 26 between the lower spiral plate outer peripheral upper weld portion 25 and the lower spiral plate outer peripheral lower weld portion 26 Not welded.

Next, the operation will be described.

FIG. 5 shows the basic operation of the head drop 12.
-Since it is the same as FIG. 6, description is omitted.

In the present invention, the upper spiral plate 6 and the lower spiral plate 1
The static pressure acting on the upper and lower surfaces of 0 was measured by actually making a scale model and performing a hydraulic experiment, and the results shown in FIGS. 2 and 3 were obtained.

In the above scale model, the upper spiral plate 6 is 3
The lower spiral plate 10 is provided for six turns.

2 and 3, white circles indicate the static pressure on the upper surface of the upper spiral plate 6 and the lower spiral plate 10, and black circles indicate the static pressure on the lower surface of the upper spiral plate 6 and the lower spiral plate 10.

FIG. 2 shows a case where the orifice plate 18 is provided on the outflow pipe 3, and FIG. 3 shows a case where the orifice plate 18 is not provided on the outflow pipe 3.

As a result of the hydraulic experiment, as shown in FIGS. 2 and 3, the difference between the static pressures acting on the upper and lower surfaces of the upper spiral plate 6 is large in the first round, and the difference in the static pressure is small in other portions. Was confirmed.

Therefore, of the contact lines between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, the upper portion having the largest static pressure difference is welded for about one half turn to the upper peripheral portion of the upper spiral plate. If the welded portion 23 is formed, sufficient supporting strength can be obtained.

In addition, of the contact line between the outer peripheral portion of the upper spiral plate 6 and the inner peripheral surface of the drop shaft 5, at least a range of about one round from a half circumference of the lower portion farthest from the upper portion. Partially welded upper spiral plate outer periphery lower welded part 24
Is formed, the support can be made at two places, so that a stronger support state can be obtained.

In addition, as described above, the upper spiral plate 6 can be easily attached at the same time.

As shown in FIGS. 2 and 3, the difference between the static pressures acting on the upper and lower surfaces of the lower helical plate 10 and the upper helical plate 6 is such that the final circumference is large and the other portions have a small static pressure difference. Was confirmed.

Therefore, of the contact lines between the outer peripheral portion of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5, the lower portion having the largest static pressure difference is welded for about one to one round from the outer periphery of the lower spiral plate. If the lower welding portion 26 is formed, a sufficient supporting strength can be obtained.

In addition, of the contact line between the outer peripheral portion of the lower spiral plate 10 and the inner peripheral surface of the drop shaft 5, a range of at least one round from a half circumference of the upper part farthest from the lower part is set. Partially welded lower spiral plate outer periphery upper welded part 2
By forming 5, it becomes possible to support at two places, so that a stronger supporting state can be obtained.

In addition, as described above, the lower spiral plate 10 can be easily attached at the same time.

As described above, the upper spiral plate 6 and the lower spiral plate 1
By limiting the welding portion between the 0 and the drop shaft 5 to a portion effective for support, high support strength is obtained and the upper spiral plate 6 and the lower spiral plate 10 can be easily attached.

FIG. 4 shows a second embodiment of the present invention. In the case where the drop of the tubular drop shaft 5 is small,
A through spiral plate 29 extending vertically is disposed inside the tubular drop shaft 5, and the upper part of the contact line between the outer peripheral portion of the through spiral plate 29 and the inner peripheral surface of the drop shaft 5 is shifted from the half circumference. The outer periphery upper welding portion 30 of the through spiral plate is formed by welding about one turn.

If necessary, at least a part of the contact line, which extends from a half circumference of the lower part to one circumference, is welded at least partially so as to form a lower spiral welded part 31 on the outer periphery of the spiral plate. It was done.

As described above, since the welding portion between the through spiral plate 29 and the drop shaft 5 is limited to a portion effective for support, high support strength is obtained and the through spiral plate 29 is easily attached. Becomes possible.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

It should be noted that the present invention is not limited only to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0063]

As described above, according to the head work of the present invention, an excellent effect that the upper spiral plate and the lower spiral plate can be easily attached and high supporting strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic overall side sectional view of a first embodiment of the present invention.

FIG. 2 shows the results of hydraulic experiments performed for the present invention;
It is a graph at the time of having an orifice.

FIG. 3 shows the results of hydraulic experiments performed for the present invention;
It is a graph in the case without an orifice.

FIG. 4 is a schematic overall side sectional view of a second embodiment of the present invention.

FIG. 5 is a schematic overall side sectional view of a head work currently being planned.

FIG. 6 is a schematic partial sectional side view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Water collecting pipe 4 Storage part (reservation pipe) 5 Drop shaft 6 Upper spiral plate 8 Upper spiral guideway 10 Lower spiral plate 11 Lower spiral guideway 23 Upper spiral plate outer peripheral upper welding part 24 Upper spiral plate outer peripheral lower welding part 25 Lower part Spiral plate outer peripheral upper welded part 26 Lower spiral plate outer peripheral lower welded part 29 Through spiral slope 30 Through spiral plate outer peripheral upper welded part 31 Through spiral plate outer peripheral lower welded part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hikaru Masuda 5-31-1, Shiraitodai, Fuchu-shi, Tokyo 1-7-101 car return complex (72) Inventor Keiichi Nishimura 3-1-1, Toyosu, Koto-ku, Tokyo (72) Inventor Satoshi Kawasaki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref.Ishikawajima-Harima Heavy Industries Co., Ltd. Ishikawashima Harima Heavy Industries Co., Ltd. (72) Inventor Riki Yoshimoto 1 Shinnakaharacho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishi Kawashima Harima Heavy Industries Co., Ltd.

Claims (6)

[Claims] 1. An upper spiral plate (6) is disposed on an upper part of a vertical tubular drop shaft (5) having a water collecting pipe (2) connected to an upper part and a storage part (4) connected to a lower part, Of the contact line between the outer peripheral part of the upper spiral plate (6) and the inner peripheral surface of the drop shaft (5), the upper part is welded for about one half turn to form the upper spiral plate outer peripheral upper welded part (23). A head work characterized by being formed. 2. An upper spiral plate (6) is disposed on an upper part of a vertical tubular drop shaft (5) having a water collecting pipe (2) connected to an upper part and a storage part (4) connected to a lower part, Of the contact line between the outer peripheral part of the upper spiral plate (6) and the inner peripheral surface of the drop shaft (5), the upper part is welded for about one half turn to form the upper spiral plate outer peripheral upper welded part (23). Forming a lower welded portion (24) of the upper spiral plate outer periphery by at least partially welding at least a part of the contact line from a half circumference to a lower circumference of the lower part of the contact line. Mechanic. 3. A lower spiral plate (10) is arranged at the lower part of a vertical tubular drop shaft (5) connected to a water collecting pipe (2) at an upper part and a storage part (4) at a lower part, The lower part of the contact line between the outer peripheral part of the lower spiral plate (10) and the inner peripheral surface of the drop shaft (5) is welded about half a turn to one turn, and the lower spiral plate outer peripheral lower welded part (26) A head work characterized by forming a. 4. A lower spiral plate (10) is disposed at the lower part of a vertical tubular drop shaft (5) connected to a water collecting pipe (2) at an upper part and a storage part (4) at a lower part, At least a part of the contact line between the outer peripheral portion of the lower spiral plate (10) and the inner peripheral surface of the drop shaft (5), which is about a half to one revolution of the upper portion, is welded at least partially. A head work comprising: forming an upper welded portion (25); and welding a lower portion of the contact line for about one to a half turn to form a lower spiral plate outer peripheral lower welded portion (26). 5. A vertically extending spiral plate (29) is provided inside a vertical tubular drop shaft (5) having a water collecting pipe (2) connected to an upper part and a storage part (4) connected to a lower part. Then, of the contact line between the outer peripheral portion of the through spiral plate (29) and the inner peripheral surface of the drop shaft (5), the upper portion is welded by about one round from a half circumference to form a through spiral plate outer peripheral upper weld portion ( 3
0) characterized by forming 0). 6. A vertical spiral drop plate (29) is provided inside a vertical tubular drop shaft (5) having a water collecting pipe (2) connected to the upper part and a storage part (4) connected to the lower part. Then, of the contact line between the outer peripheral portion of the through spiral plate (29) and the inner peripheral surface of the drop shaft (5), the upper portion is welded by about one round from a half circumference to form a through spiral plate outer peripheral upper weld portion ( 3
0) and at least partially welding a portion of the contact line from a half circumference of the lower part to about one circumference of the contact line to form a lower spiral welded part (31) on the outer periphery of the spiral plate. And head work.