JPH09209992A - After installation type pre-turning tank made of reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an installation workability by dispensing with mortaring or concreting and also lightening by the lightening characteristic of reinforced plastic. SOLUTION: An expanded part 18, in whose inside a hollow part reinforced plastics like FRP to the lower side of a pre-turning tank non-forming area 6 in an after installation type pre-turning tank 2 and also a solid part 22 is formed by the integral molding of the reinforced plastics like FRP on the lower side of the pre-turning tank forming area 5 except the lower side of the placing seat 10, 10 of a pump and materials whose specific gravity is one or more like a sand and water can be filled from the pouring port 19 removed a block member 20 to the hollow part 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retrofitted pre-rotating tank made of reinforced plastic, and more specifically, to a manhole or the like installed at an appropriate position of a sewage flow-down piping system connecting a sewage source to a sewage treatment plant. Inside the suction water tank of the pump,
The present invention relates to a retrofitting pre-rotating tank made of reinforced plastic installed at the bottom of the tank.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5, 6 and 7, a bottom portion of a suction water tank 1 of a pump such as a manhole installed at an appropriate position of a sewage flow down piping system connecting a sewage source to a sewage treatment plant. A technique is known in which a substantially disk-shaped post-installed pre-rotating tank 2 formed of reinforced plastic such as FRP is installed near 1A. This type of retrofitting pre-rotating tank 2
Is generally a pair of pre-swirl tanks 2A and 2B into which the suction ports 3 of the two pumps P1 and P2 are inserted, that is, the first pre-swirl tank 2A and the second pre-swirl tank 2B are located at one side eccentric positions. The first pre-swivel tank 2A and the second pre-swirl tank 2A are recessed with a predetermined widthwise interval.
The pre-swirl tank forming area 5 on one side of the first partition wall 4 and the other side of the first partition wall 4 are adjacent to each other by the first partition wall 4 extending in the width direction on the other side of the pre-swirl tank 2B. Pre-swirl tank non-forming area 6
And a second partition wall 7 that is orthogonal to the first partition wall 4 and extends to the side of the pre-swirling tank formation region 5 to partition the first pre-swirl tank 2A and the second pre-swirl tank 2B into separate parts. Is being done,
An inflow passage 8 for connecting the pre-swirling tank non-forming area 6 and the pre-swirl tank 2A to each other and an inflow passage 9 for connecting the pre-swirl tank non-forming area 6 and the pre-swirling tank 2B to each other are formed. . Further, mounting portions 13 of the pumps P1 and P2, that is, mounting seats 10 for mounting and fixing the discharge bend 13 are provided.

In the suction water tank 1 of the pump having the retrofitting pre-rotation tank 2 having such a structure installed at the bottom, two pumps P are used.
1, P2 are operated alternately. For example, when the first pump P1 is operated, the sewage in the suction water tank 1 is sucked up from the suction port 3 of the first pump P1, and the water level of the sewage drops below the upper level of the post-installed pre-swivel tank 2. After that, it flows into the first pre-turning tank 2A through the inflow passage 8 and is sucked up by the first pump P1 while pre-turning. Further, after the second pump P2 is operated, the dirty water in the suction water tank 1 is sucked up from the suction port 3 of the second pump P1 and the water level of the dirty water drops below the upper end level of the pre-swirl tank 2. Will flow into the second pre-rotation tank 2B through the inflow passage 9 and be sucked up by the second pump P2 while pre-turning.

By the way, a substantially disk-shaped post-installed pre-rotating tank 2
As shown in FIG. 8, the mounting seats 10 and 10 are erected on a pedestal 11 which is erected on the bottom portion 1A of the suction water tank 1 of the pump and temporarily fixed. 5
Between the pre-swirl tank 2 and the inner surface of the peripheral wall 1B of the suction water tank 1 of the pump, more specifically, one end side and the other end side of the substantially disk-shaped pre-swirl tank 2 and the suction water tank 1 of the pump. From the gaps 14, 14 formed between the inner surface of the peripheral wall 1B and FIG.
The mortar or concrete 12 is placed in the space 17 surrounded by the inner surface of the peripheral wall 1B of the suction water tank 1 of the pump, the upper surface of the bottom portion 1A and the pre-swivel tank 2, and is installed near the bottom portion 1A of the suction water tank 1 of the pump. After the mortar or concrete 12 that has been set is cured, the discharge bends 13 of the pumps P1 and P2 are placed and fixed on the mounting seats 10 and 10.

However, since the volume of the space 17 is relatively large, a large amount of mortar or concrete is required, and the placing time is long, so that the installation workability is poor.

On the other hand, there is also known a technique in which the pre-turning tank made of concrete is used in place of the retrofitting pre-turning tank made of reinforced plastic. By constructing the pre-swivel tank with concrete inverts, it is not necessary to place mortar or concrete. But,
Since the weight of the invert itself is considerably heavy, it has a drawback that it is extremely difficult to carry it in and install it in the suction water tank 1.

[0007]

That is, in the conventional retrofitting pre-swirl tank made of reinforced plastic, the volume of the space surrounded by the inner surface of the peripheral wall of the suction water tank and the upper surface of the bottom and the pre-swirl tank is relatively large, so that a large amount of Mortar or concrete is required, and the installation time is correspondingly long, resulting in poor installation workability. Further, the concrete invert has a disadvantage that it is extremely difficult to carry it in and install it in the suction water tank because the weight is considerably heavy. Therefore, the present invention provides a post-installed pre-swivel tank made of plastic that can improve installation workability by eliminating the need for placing mortar or concrete and by reducing the weight of the reinforced plastic. The purpose is to do.

[0008]

In order to achieve the above object, the invention according to claim 1 is such that a plurality of pre-swirl tanks into which suction ports of a plurality of pumps are individually inserted are provided at a predetermined eccentric position on one side. It has a pre-swirl tank forming area that is recessed with a widthwise interval and a pre-swirl tank non-forming area in which a plurality of pre-swirl tanks are not formed. The mounting seat of the pump to be installed is provided in the pre-swirling tank formation region, and in a retrofitted pre-swivel tank made of reinforced plastic that is installed at the bottom of the suction water tank of the pump, a lower side of the pre-swirl tank non-forming region A bulging part that is bulged so that it can be seated on the bottom of the suction water tank and has a hollow inside is provided continuously to either one of the lower sides of the pre-swirl tank forming area excluding the lower side of the mounting seat of the pump. , The inlet for filling the hollow part in the bulging part with a substance having a specific gravity of 1 or more can be opened and closed by the closing member. It is provided in the same direction, and it is not necessary to place mortar or concrete on the other side of the lower side of the pre-swirling tank non-forming area and the lower side of the pre-swirl tank forming area other than the pump mounting seat lower side. It is characterized in that a solid portion that can be seated is formed at the bottom of the suction water tank. The invention according to claim 2 is characterized in that a plurality of pre-swirl tanks into which the suction ports of a plurality of pumps are individually inserted are provided at one side eccentric position at a predetermined widthwise interval so as to be recessed, and a pre-swirl tank formation region is formed. And a pre-swirl tank non-formed area in which a plurality of pre-swirl tanks are not formed, and a mounting seat of a pump corresponding to each of the plurality of pre-swirl tanks is provided in the pre-swirl tank formation area, In a retrofitted pre-swivel tank made of reinforced plastic installed at the bottom of the suction water tank of the pump, the lower side of the pre-swirl tank non-formation area and the lower side of the mounting seat of the pump in the pre-swirl tank formation area Is continuously provided with a bulging portion that is bulged so as to be seated and has a hollow portion inside, and the hollow portion in the bulging portion is closed with an inlet for filling a substance having a specific gravity of 1 or more. It is characterized by being provided so as to be openable and closable by a member. According to a third aspect of the present invention, a discharge hole for discharging the liquid having a specific gravity of 1 or more, which is filled in the hollow portion, is seated on the bottom of the suction water tank at the bulging portion when the blockage member closes the inlet. It is characterized in that it is formed so as to penetrate the seating portion. Further, in the invention according to claim 4, a plurality of pre-swirl tanks into which the suction ports of a plurality of pumps are respectively inserted are recessed at one side eccentric position with a predetermined width direction interval. A pre-swirl tank non-forming area in which a plurality of pre-swirl tanks are not formed, and pump mounting seats corresponding to the plurality of pre-swirl tanks are provided in the pre-swirl tank formation area. A rear type pre-swirl tank made of reinforced plastic installed at the bottom of the suction water tank of the pump, excluding the lower side of the pre-swirl tank non-forming area and the pump mounting seat lower side in the pre-swirling tank forming area. It is characterized in that a solid portion which can be seated is formed on the bottom of the suction water tank without the need for placing mortar or concrete on the lower side.

According to the first aspect of the present invention, when the post-swirl pre-swirl tank is installed in the suction water tank, the lower side of the pre-swirl tank non-forming area and the lower side of the mounting seat of the pump in the pre-swirling tank forming area are set. Excluding the bulge formed on one of the lower sides, and the solid part formed on the other side of the lower side of the pre-swivel tank non-forming area and the lower side of the mounting seat of the pump in the pre-swirl tank forming area As a result, the space below the pre-swirl tank non-forming area and the pre-swirl tank forming area, which has been present in the past, is filled, so that mortar or concrete casting is not required. In addition, the lightweight property of the reinforced plastic can reduce the weight. Furthermore, after installing at the bottom of the suction water tank of the pump, by removing the blocking member and filling the hollow part in the bulging part from the inlet with a substance having a specific gravity of 1 or more, the weight after installation of the post-installed pre-swirl tank To prevent floating when sewage flows into the suction water tank,
The post-installed pre-swivel tank can be positioned at a predetermined position, and unnecessary force due to buoyancy can be prevented from being applied to the post-installed pre-swirl tank. According to the invention as set forth in claim 2, when a post-installation type pre-swirl tank is installed in the suction water tank, the lower side excluding the lower side of the pre-swirl tank non-forming area and the pump mounting seat lower side in the pre-swirl tank forming area. Since the bulging portion formed in (1) fills the space below the pre-swirl tank non-forming area and the pre-swirl tank forming area that existed in the past, it is not necessary to cast mortar or concrete. In addition, the lightweight property of the reinforced plastic can reduce the weight. Furthermore, after installing at the bottom of the suction water tank of the pump, by removing the blocking member and filling the hollow part in the bulging part from the inlet with a substance having a specific gravity of 1 or more, the weight after installation of the post-installed pre-swirl tank To prevent floating when sewage flows into the suction water tank,
The post-installed pre-swivel tank can be positioned at a predetermined position, and unnecessary force due to buoyancy can be prevented from being applied to the post-installed pre-swirl tank. According to the third aspect of the present invention, the filled state of the liquid having a specific gravity of 1 or more filled in the hollow portion from the inlet can be maintained by closing the inlet with the closing member. On the other hand, when the post-installation type pre-swirl tank is removed, the closing member is removed to release the blockage of the injection port, and as the post-installation type pre-swirl tank is lifted, the liquid having a specific gravity of 1 or more filled in the hollow portion is It can be gradually discharged from the discharge hole to the outside of the bulging portion. According to the invention as set forth in claim 4, when the post-swirl pre-swirl tank is installed in the suction water tank, the pre-swirl except for the solid portion existing below the pre-swirl tank non-forming region and the pump mounting seat lower side Since the solid part existing below the tank formation area fills the space below the pre-swirl tank non-formation area and pre-swirl tank formation area that existed before, there is no need to place mortar or concrete. . In addition, the lightweight property of the reinforced plastic can reduce the weight. Furthermore, the solid portion increases the weight of the post-installation type pre-swirl tank to prevent lifting due to buoyancy when sewage flows into the suction water tank, and it can be positioned at a predetermined position. It is possible to prevent the force from being applied to the retrofitting type pre-rotation tank.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. It should be noted that, except for the characteristic configuration of the present invention, it is the same as the conventional example of FIG. 5 to FIG. 8, so the description of the structure and operation thereof will be omitted and the same reference numerals will be given.

FIG. 1 shows an embodiment of the invention as claimed in claim 1. In this figure, a hollow portion 15 is internally formed below the pre-swirl tank non-forming area 6 in the post-installed pre-swirl tank 2. The bulged portions 18 provided are continuously provided by integral molding of reinforced plastic such as FRP. When the pre-swirl tank 1 is installed in the suction water tank 1 in a state in which the bottom portion thereof, that is, the seating portion 18A is seated on the bottom portion 1A of the suction water tank 1, the bulging portion 18 has a part of the outer peripheral standing surface 18B that is the suction water tank. It is formed in a size that abuts on the inner surface of the peripheral wall 1B. An injection port 19 is provided which penetrates a part of the pre-swirling tank non-forming area 6 and communicates with the hollow portion 15. The injection port 19 is configured to be opened and closed by a closing member 20 made of, for example, a plug. . The closing member 20 may be a valve that opens and closes the injection port 19. Further, a discharge hole 21 having a relatively small diameter is formed through the seating portion 18A.

On the other hand, a solid portion 22 is formed by integral molding of reinforced plastic such as FRP on the lower side of the pre-swirl tank forming region 5 excluding the lower side of the pump mounting seats 10, 10. The solid portion 22 has a bottom portion, that is, a seat portion 22A.
When the pre-swirl tank 1 is installed in the suction water tank 1 with the bottom seated on the bottom portion 1A of the suction water tank 1, a part of the outer peripheral standing surface 22B is formed in a size that abuts on the inner surface of the peripheral wall 1B of the suction water tank 1. Has been done.

The mounting seats 10 and 10 of the pump are made of a steel plate embedded in a reinforced plastic such as FRP, that is, a steel plate insert-molded in a retrofitted pre-rotating tank made of reinforced plastic, and the lower surface thereof is a pedestal. The pump P1, P2 mounting portion 13, that is, the discharge bend 13 is placed and fixed on the upper surface of the pump 11. In the figure, reference numeral 23 denotes an anchor bolt, which fixes the first pre-turning tank 2A and the second pre-turning tank 2B via a seat plate 24 having a relatively large area.

With such a structure, the mounting seats 10, 1
0 is erected on a pedestal 11 standing on the bottom 1A of the suction water tank 1 of the pump, the seating portion 18A of the bulging portion 18 is seated on the bottom portion 1A of the suction water tank 1, and the seating portion 22A of the solid portion 22 is In the installed state of the pre-swirl tank 1 in which the water is seated on the bottom portion 1A of the suction water tank 1, there is no space below the pre-swirl tank non-forming area 6 and below the pre-swirl tank forming area 5. That is, since the bulging portion 18 and the solid portion 22 fill the space 17 (see FIG. 8) below the pre-swirl tank non-forming area 6 and the pre-swirl tank forming area 5 which have been conventionally present. ,
No need to cast mortar or concrete. Therefore, the installation workability is improved as compared with the conventional retrofitted pre-turning tank made of reinforced plastic. Further, the lightweight property of the reinforced plastic reduces the weight as compared with the conventional concrete invert, so that the workability of carrying in and installing the suction water tank 1 is improved.

On the other hand, after being installed in the suction water tank 1 of the pump, the blocking member 20 is removed and the swelling portion 18 is discharged from the inlet 19.
The hollow portion 15 therein is filled with a substance 27 having a specific gravity of 1 or more, such as sand or water, and the inlet 19 is closed by the closing member 20 to increase the weight after the pre-swirl tank 2 is installed, It is possible to prevent the floating when the dirty water flows into the suction water tank 1 and to position the pre-swivel tank 2 at a predetermined position, and to prevent unnecessary force due to buoyancy from being applied to the post-installed pre-swirl tank 2. .

When a liquid having a specific gravity of 1 or more such as water is used as the substance 27 to be filled in the hollow portion 15, the filling port 19 is closed immediately after filling by the closing member 20 to prevent leakage from the drain hole 21. Thus, the filled state of the liquid can be maintained. On the other hand, when the post-installation type pre-swirl tank 2 is removed, the closing member is removed to unblock the injection port 19, so that the post-installation type pre-swivel tank 2 is lifted.
The liquid having a specific gravity of 1 or more filled in the hollow portion 15 can be gradually discharged from the discharge hole 21 to the outside of the bulging portion 18. As a result, the weight of the pre-rotating tank 2 is reduced,
The replacement work of the pre-swirl tank 2 can be easily performed. That is, when the pump capacity is increased due to an increase in the amount of sewage flowing into the suction water tank 1,
A new pre-turning tank 2 having a first pre-turning tank 2A and a second pre-turning tank 2B corresponding to the first pump P1 and the first pump P2 whose capacity has been increased by removing the existing pre-turning tank 2 It becomes easy to remove the existing pre-swirl tank 2 when replacing the pre-swirl tank 2 with the manhole.

FIG. 2 shows another embodiment of the invention as set forth in claim 1, which is the lower side of the pre-swirl tank forming region 5 excluding the lower side of the pump mounting seats 10, 10 in the post-installed pre-swirl tank 2. A bulging portion 18 having a hollow portion 15 inside is continuously formed by integral molding of reinforced plastic such as FRP, and a solid portion is formed below the pre-turning tank non-forming region 6 by integral molding of reinforced plastic such as FRP. 22 is formed. Even with such a configuration, the same operation and effect as those of the post-installed pre-swivel tank 2 shown in FIG. 1 can be obtained.

FIG. 3 shows an embodiment of the present invention as set forth in claim 2, in which the pump mounting seat in the pre-swivel tank non-forming area 6 and in the pre-swirl tank forming area 5 in the post-installed pre-swirl tank 2 is shown. 1
A bulging portion 18 bulging so as to be seated in the bottom portion 1A of the suction water tank 1 and having a hollow portion 15 therein is continuously provided on the lower side except the lower side of 0 and 10, and the inside of the bulging portion 18 is An injection port 19 for filling the hollow portion 15 with a substance having a specific gravity of 1 or more is provided by a closing member 20 so as to be opened and closed. When the pre-swirl tank 1 is installed in the suction water tank 1 in a state in which the bottom portion thereof, that is, the seating portion 18A is seated on the bottom portion 1A of the suction water tank 1, the bulging portion 18 has a part of the outer peripheral standing surface 18B that is the suction water tank. It is formed in a size that abuts on the inner surface of the peripheral wall 1B. An injection port 19 is provided which penetrates the pre-swirl tank forming region 5 and the pre-swirl tank non-forming region 6 and communicates with the hollow portion 15. The injection port 19 is opened and closed by a closing member 20 made of, for example, a plug. It is configured to be able to. This closing member 20
May be configured by a valve that opens and closes the injection port 19.
Further, a discharge hole 21 having a relatively small diameter is formed through the seating portion 18A.

With such a configuration, the mounting seats 10, 1
In the installation state of the pre-swivel tank 1 in which 0 is erected on the pedestal 11 which is erected on the bottom portion 1A of the suction water tank 1 of the pump, and the seating portion 18A of the bulging portion 18 is seated on the bottom portion 1A of the suction water tank 1, Pre-swirl tank non-forming area 6 and pre-swirl tank forming area 5
There is no space below. That is, since the bulging portion 18 fills the space 17 (see FIG. 8) below the pre-swirl tank non-forming area 6 and the pre-swirl tank forming area 5, which are conventionally present, the mortar or concrete No need to set. Therefore, the installation workability is improved as compared with the conventional retrofitted pre-turning tank made of reinforced plastic. Further, the lightweight property of the reinforced plastic reduces the weight as compared with the conventional concrete invert, so that the workability of carrying in and installing the suction water tank 1 is improved.

On the other hand, after being installed in the suction water tank 1 of the pump, the blocking member 20 is removed and the swelling portion 18 from the inlet 19 is removed.
The hollow portion 15 therein is filled with a substance 27 having a specific gravity of 1 or more, such as sand or water, and the inlet 19 is closed by the closing member 20 to increase the weight after the pre-swirl tank 2 is installed, It is possible to prevent the floating when the dirty water flows into the suction water tank 1 and to position the pre-swivel tank 2 at a predetermined position, and to prevent unnecessary force due to buoyancy from being applied to the post-installed pre-swirl tank 2. .

When a liquid such as water having a specific gravity of 1 or more is used as the substance 27 to be filled in the hollow portion 15, the filling port 19 is closed immediately after filling by the closing member 20 to prevent leakage from the drain hole 21. Thus, the filled state of the liquid can be maintained. On the other hand, when the post-installation type pre-swirl tank 2 is removed, the closing member is removed to unblock the injection port 19, so that the post-installation type pre-swivel tank 2 is lifted.
The liquid having a specific gravity of 1 or more filled in the hollow portion 15 can be gradually discharged from the discharge hole 21 to the outside of the bulging portion 18. As a result, the weight of the pre-rotating tank 2 is reduced,
The replacement work of the pre-swirl tank 2 can be easily performed. That is, when the pump capacity is increased due to an increase in the amount of sewage flowing into the suction water tank 1,
A new pre-turning tank 2 having a first pre-turning tank 2A and a second pre-turning tank 2B corresponding to the first pump P1 and the first pump P2 whose capacity has been increased by removing the existing pre-turning tank 2 It becomes easy to remove the existing pre-swirl tank 2 when replacing the pre-swirl tank 2 with the manhole.

FIG. 4 shows an embodiment of the present invention as defined in claim 4, in which the pre-swivel tank forming region 5 of the post-installed pre-swivel tank 2 excluding the lower side of the pump mounting seats 10, 10 is shown. FRP on the lower side and on the lower side of the pre-swirl tank non-forming area 6
Solid part 2 by integral molding of reinforced plastic such as
6, 26 are formed. These solid parts 26, 26
When the pre-swirl tank 1 is installed in the suction water tank 1 with its bottom portion, that is, the seating portion 26A seated on the bottom portion 1A of the suction water tank 1, a part of the outer peripheral standing surface 26B is a peripheral wall 1B of the suction water tank 1. Is formed so as to abut the inner surface of the.

With such a structure, the mounting seats 10, 1
0 is installed on a pedestal 11 standing on the bottom portion 1A of the suction water tank 1 of the pump, and the seat portions 26A of the solid portions 26, 26 are seated on the bottom portion 1A of the suction water tank 1, and the solid portion 2
In the installed state of the pre-swirl tank 1 in which the seating portions 22A of 6, 26 are seated on the bottom portion 1A of the suction water tank 1, spaces are formed below the pre-swirl tank non-forming area 6 and the pre-swirling tank forming area 5. Cease to exist. That is, since the solid portions 26, 26 fill the space 17 (see FIG. 8) below the pre-swirl tank non-forming area 6 and the pre-swirl tank forming area 5, which are conventionally present, the mortar or No need to pour concrete. Therefore, the installation workability is improved as compared with the conventional retrofitted pre-turning tank made of reinforced plastic. In addition, the lightweight characteristics of reinforced plastic make it lighter than conventional concrete inverters, so the suction water tank 1
The workability of loading / installing the product into / from is improved.

On the other hand, it is possible to increase the weight of the retrofitting type pre-rotation tank 2 by the solid portions 26, 26 and prevent the lift-up due to buoyancy when dirty water flows into the suction water tank 1 and position it at a predetermined position. In addition, it is possible to prevent unnecessary force due to buoyancy from being applied to the post-installed pre-swivel tank 2.

In each of the above-mentioned embodiments, the single-molding pre-swirl tank 2 is used for explanation, but for example, the second partition wall 7 is used.
It is also applicable to the pre-swirl tank 2 which is divided into two parts on the left and right and is integrally connected to the upper surface 7A and the region on the extension line of the upper surface 7A, or the pre-swirl tank 2 which is divided into three or more and is integrally connected.

[0026]

As described above, according to the first aspect of the present invention, the mounting seat is installed on the pedestal which is erected on the bottom of the suction water tank of the pump, and the seating part and the solid part of the bulging part are installed. In the installed state of the pre-swivel tank in which the seating parts of are respectively seated on the bottom of the suction water tank, the swelling part and the solid part prevent Since the space below the formation area and the pre-swirl tank formation area will be filled, mortar or concrete pouring will be unnecessary. Therefore, the installation workability is improved as compared with the conventional retrofitted pre-turning tank made of reinforced plastic. Further, the lightweight property of the reinforced plastic reduces the weight as compared with the conventional concrete invert, so that the workability of carrying in and installing in the suction water tank is improved. Further, the hollow portion in the bulging portion from the injection port is filled with a substance having a specific gravity of 1 or more,
By closing the inlet with a blocking member, the weight after the pre-swirl tank is installed is increased, and when the dirty water flows into the suction water tank, it prevents lifting and positions the pre-swirl tank at a predetermined position. In addition, it is possible to prevent unnecessary force due to buoyancy from being applied to the post-installed pre-swivel tank. Claim 2
In the invention described, the mounting seat is erected on a pedestal that is erected at the bottom of the suction water tank of the pump, and the seating part of the bulging portion is seated on the bottom of the suction water tank. Since the exit part fills the space below the pre-swivel tank non-forming area and the pre-swirl tank forming area, which existed in the conventional retrofitting pre-swivel tank made of reinforced plastic, the mortar or concrete pouring No need for installation. For this reason,
Installation workability is improved compared to the conventional retrofitted pre-turning tank made of reinforced plastic. Further, the lightweight property of the reinforced plastic reduces the weight as compared with the conventional concrete invert, so that the workability of carrying in and installing in the suction water tank is improved. Furthermore, from the inlet to the hollow part in the bulge,
By filling the material with a specific gravity of 1 or more and closing the inlet with the closing member, the weight after the pre-swirl tank is installed is increased,
It is possible to prevent the floating when the dirty water flows into the suction water tank and position the pre-swivel tank at a predetermined position, and it is possible to prevent unnecessary force due to buoyancy from being applied to the post-installed pre-swirl tank. According to the third aspect of the present invention, the filled state of the liquid having a specific gravity of 1 or more filled in the hollow portion from the inlet can be maintained by closing the inlet with the closing member.
Further, when the post-installation type pre-swirl tank is removed, the blocking member is removed to release the blockage of the injection port, so that the specific gravity of the hollow part filled with the specific gravity of 1
The above liquid can be gradually discharged from the discharge hole to the outside of the bulging portion. As a result, the weight of the post-installed pre-swivel tank made of plastic is reduced, so that the replacement work can be easily performed. The invention according to claim 4 is a pre-rotation tank in which a mounting seat is erected on a pedestal that is erected at the bottom of a suction water tank of a pump, and seat portions of both solid portions are respectively seated on the bottom portion of the suction water tank. In the installed state, both solid parts will fill the space below the pre-swivel tank non-forming area and the pre-swirl tank forming area that existed in the conventional reinforced plastic post-installed pre-swirl tank. No need to place mortar or concrete. Therefore, the installation workability is improved as compared with the conventional retrofitted pre-turning tank made of reinforced plastic. Further, the lightweight property of the reinforced plastic reduces the weight as compared with the conventional concrete invert, so that the workability of carrying in and installing in the suction water tank is improved. Furthermore, both solid parts increase the weight of the post-installation type pre-swivel tank and prevent it from rising due to buoyancy when dirty water flows into the suction water tank, and it is possible to position it at a predetermined position, and unnecessary buoyancy is required. It is possible to prevent the force from being applied to the retrofitting type pre-rotation tank.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing an embodiment of the invention according to claim 1.

FIG. 2 is an enlarged cross-sectional view showing another embodiment of the invention according to claim 1.

FIG. 3 is an enlarged sectional view showing an embodiment of the invention described in claim 2.

FIG. 4 is an enlarged sectional view showing an embodiment of the invention described in claim 4.

FIG. 5 is a perspective view of a post-installed pre-rotation tank.

FIG. 6 is a plan view of a post-installed pre-swirl tank.

FIG. 7 is a vertical cross-sectional view showing a state in which a post-installation type pre-swirl tank is installed in a pump suction water tank.

FIG. 8 is an enlarged cross-sectional view showing a state in which a conventional pre-swivel tank is installed and fixed.

[Explanation of symbols]

 1 Pump suction water tank 1A Pump suction water tank bottom 2 Retrofitting pre-swirl tank (board) 2A 1st pre-swirl tank 2B 2nd pre-swirl tank 3 Pump suction port 4 First partition wall 5 Pre-swirl tank formation Area 6 Pre-swirling tank non-formed area 7 Second partition wall 10 Mounting seat 12 Mortar or concrete 15 Hollow part 18 Swelling part 19 Injection port 20 Closing member 21 Injection port 22 Solid part 26 Solid part 27 Specific gravity of 1 or more Material P1 pump P2 pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taro Shinesue 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka Prefecture Kubota Hirakata Factory

Claims (4)

[Claims] 1. A pre-swirling tank formation region in which a plurality of pre-swirl tanks into which the suction ports of a plurality of pumps are respectively inserted are recessed at one side eccentric position with a predetermined width direction interval, And a pre-swirl tank non-formation area in which the pre-swirl tank is not formed, and a pump mounting seat corresponding to each of the plurality of pre-swirl tanks is provided in the pre-swirl tank formation area to suck the pump. In a retrofitted pre-swivel tank made of reinforced plastic installed at the bottom of the tank,
Hollow inside by bulging so that it can be seated at the bottom of the suction water tank on either the lower side of the pre-swirling tank non-forming area or the lower side of the pre-swirl tank forming area excluding the lower side of the mounting seat of the pump. A swelling portion provided with a portion is continuously provided, and an injection port for filling a hollow portion in the swelling portion with a substance having a specific gravity of 1 or more is openably and closably provided by a closing member, and the pre-swirl tank non-forming area is formed. A solid part that can be seated is formed on the bottom of the suction water tank without the need for placing mortar or concrete on the other side of the lower side of the pump and the lower side of the mounting seat of the pump in the pre-swirling tank formation area. A post-swivel pre-swivel tank made of reinforced plastic. 2. A pre-swirl tank forming region in which a plurality of pre-swirl tanks into which suction ports of a plurality of pumps are respectively inserted are recessed at one side eccentric position with a predetermined width direction interval, And a pre-swirl tank non-formation area in which the pre-swirl tank is not formed, and a pump mounting seat corresponding to each of the plurality of pre-swirl tanks is provided in the pre-swirl tank formation area to suck the pump. In a retrofitted pre-swivel tank made of reinforced plastic installed at the bottom of the tank,
A hollow portion is provided inside the pre-swirling tank non-forming area and below the mounting seat of the pump in the pre-swirling tank forming area so as to swell so as to be seated at the bottom of the suction water tank. A swelling portion is continuously provided, and an injection port for filling a substance having a specific gravity of 1 or more is provided in a hollow portion in the swelling portion so as to be opened and closed by a closing member. Tank. 3. A seating portion in which a discharge hole for discharging a liquid having a specific gravity of 1 or more filled in the hollow portion is seated on the bottom portion of the suction water tank in the bulging portion when the blockage member releases the blockage of the injection port. The post-pre-swirl tank made of reinforced plastic according to claim 1 or 2, wherein the post-swivel tank is made of reinforced plastic. 4. A pre-swirl tank forming region in which a plurality of pre-swirl tanks into which the suction ports of a plurality of pumps are individually inserted are recessed at one side eccentric position with a predetermined widthwise interval, And a pre-swirl tank non-formation area in which the pre-swirl tank is not formed, and a pump mounting seat corresponding to each of the plurality of pre-swirl tanks is provided in the pre-swirl tank formation area to suck the pump. In a retrofitted pre-swivel tank made of reinforced plastic installed at the bottom of the tank,
A solid part that can be seated on the bottom of the suction water tank without the need for placing mortar or concrete on the lower side of the pre-swirling tank non-forming area and the lower side of the mounting seat of the pump in the pre-swirling tank forming area A post-swivel pre-swivel tank made of reinforced plastic characterized by being formed.