JP3698824B2 - Unit tank installation structure in the manhole - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a unit internal tank installation structure in a manhole.
[0002]
[Prior art and its problems]
As shown in FIG. 12, a concrete inner tub 105 having two bottomed holes 107a and 107b recessed is installed at the bottom of the manhole 101 into which drainage flows, and the periphery thereof is hardened with mortar. It has been widely known that the inflowing wastewater is pumped up and discharged by the alternating operation of the two pumps 117a and 117b in which the suction port 118 is guided to the lower part of the bottomed holes 107a and 107b and the discharge port 119 is guided. Are known.
[0003]
However, the concrete inner tub 105 is heavy, and requires a great deal of labor for transportation to the site and installation in the manhole 101, and requires a loading device such as a crane. Furthermore, in the unit type inner tank in which the start end fixing member mounting seat of the waste water pumping pipe 103 is attached to the upper edge front portion of the bottomed holes 107a and 107b, the diameter in the front-rear direction is increased, so that it is formed with a small diameter. Carrying in from the manhole opening 104 is extremely difficult, and the installation work becomes more complicated and the construction cost increases.
[0004]
OBJECT OF THE INVENTION
An object of the present invention is a lightweight and two-part structure that is not bulky, and can be easily transported to the site, carried in from the manhole opening, and installed on the bottom of the manhole and installed in the unit inner tank in the manhole. Is to provide.
[0005]
[Structure of the invention]
In the unit inner tank installation structure in the manhole according to the present invention, the tank skin portion of the unit inner tank which is carried in from the manhole opening and is installed on the manhole bottom via the post base will be divided into two in the front-rear direction by resin molding. The two bottomed holes that allow the suction port of the submersible sewage pump to be inserted into the rear tank skin are provided and a flow groove is provided to flow between the bottomed holes. The rear edge of the front tank skin and the rear tank The abutment surfaces of the skin are bent together downward and are brought into contact with each other in the front-rear direction, and the upper surface of the rear edge of the front tank skin or the upper surface of the front edge of the rear tank skin or both Perforating holes for filling material are drilled along the contact surface of the tank skin, anchor bolt holes are arranged around the perforated holes, and the upper surface thereof is formed on the support seat of the fixing member described later, Support bolt holes are provided on the outer peripheral edge of both tank skins and placed on the bottom of the manhole. 2 split and without the mount base in the longitudinal direction is, the cross-platform base and between the opposing faces periphery whole is held the space in the open with a double bath skin, the front base rear portion and the rear base front The upper end portion of the support rod erected from the upper portion is opposed to the anchor bolt hole, and the upper end portion of the support bolt erected from the front portion of the front base and the rear portion of the rear base is fixed to the support bolt hole. Depending on the state, the filler is injected from the injection through hole into the space on the back side of both tank skins and solidified, and the starting end fixing member of the waste water pumping pipe is placed on the support seat and anchor bolts are used. It is fixed.
[0006]
【Example】
Hereinafter, description will be made with reference to the drawings of the embodiments.
[0007]
Reference numeral 1 denotes a manhole into which wastewater flows, which has a wastewater inlet 2 that opens to the inside and a wastewater feed pipe 3 that is led to the outside, and an upper portion through an inclined block 1a. A small-diameter manhole opening 4 is opened to the ground surface, and is closed by a manhole cover 4a during normal times. The tank in the unit that is carried in from the opening 4 and is installed at the bottom of the manhole 1 is divided into two in the front-rear direction by, for example, resin molding such as FRP resin, and the rear edge and the rear of the front tank 5a The front edges of the tank skin 5b are brought into contact with each other from the front and rear directions at the contact surfaces 6a, 6b bent downward, respectively, and the rear tank skin 5b is connected to the below-mentioned underwater sewage pumps 17a, 17b. Two bottomed holes 7a and 7b into which the suction ports 18 and 18 are inserted are recessed. The peripheral walls of these two bottomed holes 7a and 7b are formed in a bowl-shaped inclined surface having a large diameter at the top and a small diameter at the bottom. 8a is a side groove vertically provided along one side of the peripheral wall of one bottomed hole 7a, 8b is a side groove vertically provided along one side of the peripheral wall of the other bottomed hole 7b, and 8 is a groove on both sides 8a. , 8b are flow grooves for extending both the bottomed holes 7a, 7b by extending them in the direction opposite to the rotation direction of the pump. 9 and 9 are for injecting fillers drilled along the upper surface of the rear edge of the front tank skin 5a or the upper surface of the front edge of the rear tank skin 5b or the contact surfaces 6a and 6b of the tank skins 5a and 5b. The through holes 3b are fixing member support seats formed on the upper surface of the peripheries of the through holes 9 and 9 , 10... 10 are anchor bolt holes arranged in the support seat 3b, and 11. It is the support bolt hole arrange | positioned at the outer peripheral part of 5a, 5b. The gantry base placed on the bottom surface of the manhole is divided into two parts in the front-rear direction, and a space portion 5 in which the entire peripheral side is open between the opposed surfaces of the gantry base and the tank skins 5a and 5b is held . Anchor bolts 13a for attaching the fixing member 14 to be described later are derived from the anchor bolt holes 10... 10 by extending the upper portions of the support rods 13... 13 erected from the rear part of the front base 12a and the front part of the rear base 12b. The mortar is formed by 13a, with the upper ends of the support bolts 16 erected from the front part of the front base 12a and the rear part of the rear base 12b fixed to the support bolt holes 11. both tanks skin 5a the sealing member 15 of any injection hole 9 and the like, after solidified by injecting into the space portion 5 of the back side of 5b, reinforcing the fixing member support seat 3b on For example the plate 3c for implantation hole by polymerizing 9, 9 to further its upper surface to close the anchor bolts 13a ‥‥ 13a by placing the fixing member 14 that supports the leading end 3a of the waste water lifting flue 3 To fix it. 17a is an underwater filth pump accommodated so that the suction port 18 is opened to the lower part in one bottomed hole 7a, and 17b is a submerged water accommodated so that the suction port 18 is opened in the other bottomed hole 7b. In any waste pump, the discharge port 19 is detachably connected to the start end portion 3a of the waste water pumping pipe 3. 20 water sewage pumps 17a, elevating guide used when 17b of apparatus-side detachably attaching, 21 bottomed hole 7a, is reinforced seat which is projectingly provided on the upper surface of the post side base 12b order to support the hole bottom rear surface of 7b .
[0008]
When the inside of the manhole 1 rises to a predetermined start water level due to the inflow of waste water, the first pump 17a is started and the discharge and discharge of waste water is started. After the pumping operation has progressed and the water level has reached the upper edges of the bottomed holes 7a and 7b, the waste water in the first bottomed hole 7a is pumped and discharged. Since the pumping and discharging action of the pump 17a causes the waste water inflow action from the second bottomed hole 7b through the flow groove 8 into the first bottomed hole 7a, the water level in the second bottomed hole 7b is It begins to fall in synchronization with the water level in the bottomed hole 7a. In addition, a swirl flow is formed and amplified in the first bottomed hole 7a by the waste water inflow action through the flow groove 8, and the waste water swirls and rises from the peripheral portion along the mortar-shaped inclined surface. It descends to cause a convection action, and therefore suspended matter and sediment in the wastewater are sucked from the pump suction port 18 while being vigorously stirred. When the water level in both the bottomed holes 7a and 7b reaches a predetermined stop water level near the bottom of the hole, the first pump 17a stops. During this time, not only the wastewater in the first bottomed hole 7 a but also the wastewater in the second bottomed hole 7 b is pumped and discharged through the flow groove 8. This does not simply mean that waste water does not remain in the second bottomed hole 7b when the pump is stopped. Accordingly, the formation time of the swirl flow is maintained. That is, the stirring time of the suspended matter and the precipitate in the first bottomed hole 7a is increased accordingly. Therefore, suspended matters and sediments are easily pumped and discharged together with the waste water and do not remain in the tank.
[0009]
Next, when the water level in the manhole 1 rises again to the predetermined starting water level due to the inflow of the waste water, the second pump 17b is started to discharge and discharge the waste water, and the water level reaches the bottomed holes 7a and 7b. After reaching the upper edge, the waste water in the second bottomed hole 7b is pumped up and discharged, but the following operation is the same as in the case of starting the first pump 17a described above. Is omitted.
[0010]
【The invention's effect】
According to the present invention, the tank skin portion of the unit inner tank is divided into two in the front-rear direction by resin molding, and is extremely light and not bulky compared to a conventional concrete inner tank. loading work from the narrow隘manhole openings also that easy and Do. And the space part in the back surface of the tank skin of the inner tank of the unit is in an open state on the entire circumferential side, and the filler injected from the injection through hole is in close contact with the inner peripheral wall of the lower part of the manhole body Since the unit inner tank is completely integrated with the manhole body and the waterproof property is secured, there is an advantage that the installation work on the manhole bottom can be carried out smoothly and at low cost. Also, the inner tank surface is smoothly formed by the resin-molded tank skin, and there is no roughness like a concrete inner tank, so the scum and sediment can be sucked smoothly and sent to the waste water pumping pipe. There is an effect.
[Brief description of the drawings]
FIG. 1 is a vertical side view showing a state where a unit inner tank is installed in a manhole by the installation structure of the present invention.
FIG. 2 is a plan view of a front tank skin for constituting the structure of the present invention.
FIG. 3 is a longitudinal side view taken along line AA in FIG. 2;
FIG. 4 is a plan view of a rear tank skin for constituting the structure of the present invention.
5 is a longitudinal side view taken along line BB in FIG. 4. FIG.
FIG. 6 is a plan view of a front base for constituting the structure of the present invention.
FIG. 7 is a side view of a front base for constituting the structure of the present invention.
FIG. 8 is a plan view of a rear base for constituting the structure of the present invention.
FIG. 9 is a side view of a rear base for constituting the structure of the present invention.
FIG. 10 is a plan view of a unit inner tank in the structure of the present invention.
11 is a longitudinal side view taken along the line CC of FIG.
FIG. 12 is a longitudinal front view of a manhole in which a conventional concrete inner tub is installed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole 3 Waste water pumping pipe 3a Starting end part of waste water pumping pipe 3b Fixing member support seat 4 Manhole opening 5 Space part with all the circumference side open state 5a Front tank skin 5b Rear tank skin 6a Contact surface 6b Contact surface 7a Bottomed hole 7b Bottomed hole 8 Flowing groove 9 Filling material injection hole 10 Anchor bolt hole 11 Support bolt hole 12a Front base 12b Rear base 13 Support rod 13a Anchor bolt 14 Support member for drainage pumping pipe start end 15 Filler 16 Support bolt
17a Submersible sewage pump
17b Submersible sewage pump
18 Suction port

Claims (1)

2 split and without the front-rear direction Sogawa part of the unit tank installed into the manhole bottom via a later gantry base brought conveyed from the manhole opening by resin molding, the suction port of the water sewage pump rearward bath skin The two bottomed holes to be inserted are recessed and a flow groove is provided to circulate between the bottomed holes. The rear edge of the front tank skin and the front edge of the rear tank skin are bent downward. The contact surfaces are brought into contact with each other from the front-rear direction , and the filler is injected along the upper surface of the rear edge of the front tank skin, the upper surface of the front edge of the rear tank skin, or the contact surface of both tank skins. Through holes, anchor bolt holes are arranged in the periphery of the through holes, and the upper surface is formed on the support seat of the fixing member described later, and support bolt holes are arranged in the outer peripheral edge portions of both tank skins. set, and 2 split and without the mount base in the longitudinal direction to be placed on the manhole bottom, cross-platform Over scan and peripheral whole in between the opposing surfaces of the two tanks skin is to retain the space portion of the open, the upper end portion of the supporting rod erected from the front base of the rear portion and the rear base of the front portion anchor bolt Opposite to the hole, the upper end of the support bolt standing from the front part of the front base and the rear part of the rear base is fixed to the support bolt hole . A unit in a manhole characterized in that a filler is injected into the space and solidified, and a starting end fixing member of a waste water pumping pipe is placed on the support seat and fixed by an anchor bolt. Inner tank installation structure.

Images