JPH1037297A - Unit inner-tank mounting structure in manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate conveyance onto a field and carrying-in from the opening section of a manhole, and to conduct installation works smoothly at low cost by forming the tank skin section of an inner tank and a frame base in a two piece type respectively. SOLUTION: The tank skin section of a unit inner tank installed onto the bottom section of a manhole is formed in the two piece type of a front tank skin 5a and a rear tank skin 5b by resin mold. A frame base 2 placed on the base of the manhole is formed in the two piece type of a front base 12a and a rear base 12b. The front tank skin 5a and the rear tank skin 5b are fixed onto the front base 12a and the rear base 12b by support levers 13 and support bolts 16, 16. Fillers are infected into the rear-side hollow sections 5, 5 of both tank skins 5a, 5b, and solidified. Accordingly, conveyance onto a field and carrying-in from the narrow opening section of the manhole are facilitated, and installation works can be executed smoothly at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for installing a tank in a unit in a manhole.

[0002]

2. Description of the Related Art As shown in FIG. 12, a concrete inner tank 1 having two bottomed holes 107a and 107b recessed in the lower bottom of a manhole 101 into which drainage flows.
And two pumps 117a, 1 having a suction port 118 and a discharge port 119 in the lower part of the bottomed holes 107a, 107b.
It has been widely known that the inflow wastewater is pumped and discharged by the alternate operation of 17b.

[0003] However, the concrete inner tank 105 is heavy and requires a great deal of labor to transport it to the site and install it in the manhole 101, and also requires a carrying-in device such as a crane. Furthermore, bottomed holes 107a, 10
Since the diameter of the unit type inner tank in which the starting end fixing member mounting seat of the wastewater discharge pipe 103 is attached to the front part of the upper edge of the upper part 7b becomes large in the front-rear direction, the carry-in from the manhole opening 104 having a small diameter is not possible. It is extremely difficult, and the installation work becomes more complicated, resulting in higher construction costs.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light-weight and two-part structure which is not bulky and can be easily and inexpensively transported to a site, carried in through a manhole opening, and installed on a manhole bottom. It is an object of the present invention to provide a unit tank installation structure.

[0005]

In the structure for installing a tank in a unit in a manhole according to the present invention, the skin of the tank in the unit, which is carried in from the opening of the manhole and placed on the bottom of the manhole via the base of the gantry, will be formed by resin molding. It is made into a two-segment type in the direction, two bottomed holes are recessed in the rear tank skin, and a circulation groove is provided for flowing between both the bottomed holes, and the rear edge of the front tank skin and the front edge of the rear tank skin are formed. The upper and lower portions are contacted and joined together from front and rear and rear at the contact surfaces bent downward, and 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. Drilling holes for filling material along the contact surface,
An anchor bolt hole is provided around the perimeter of the through hole, and the upper surface thereof is formed on a support seat of a fixing member described later. A support bolt hole is provided at the outer peripheral edge of both tank skins, and is placed on the bottom of the manhole. The pedestal base is divided into two in the front-rear direction, and the upper end of the support rod erected from the rear part of the front base and the front part of the rear base is opposed to the anchor bolt hole, and the front part of the front base and In a state in which the upper end of the support bolt erected from the rear portion of the rear base is fixed to the support bolt hole, a filler is injected from the injection hole into the backside hollow portion of both tank skins and solidified, The starting end fixing member of the wastewater discharge pipe is placed on the support seat and fixed by the anchor bolt.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the drawings.

Reference numeral 1 denotes a manhole into which wastewater flows. The manhole has a wastewater inlet 2 opened to the inside and a wastewater discharge pipe 3 extended to the outside. The small-sized manhole opening 4 is opened to the ground via 1a, and is closed by the manhole cover 4a in normal times. The unit inner tank which is carried in from the opening 4 and installed at the bottom of the manhole 1 has a tank skin portion divided into two in the front-rear direction by, for example, resin molding such as FRP resin, and a rear edge portion and a rear portion of the front tank skin 5a. The front edge of the tank skin 5b is brought into contact with each other from the front-rear direction at the contact surfaces 6a and 6b which are bent downward, and the rear tank skin 5b is provided with two bottomed holes 7a, 7b is recessed. These two bottomed holes 7
The peripheral walls of a and 7b are formed on a mortar-shaped inclined surface having a large diameter on the upper side and a small diameter on the lower side. 8a is a side groove vertically provided along one side of the peripheral wall of one bottomed hole 7a, and 8b is the other bottomed hole 7b.
A vertical groove 8 is formed along one side of the peripheral wall to extend these two side grooves 8a and 8b in a direction opposite to the rotation direction of the pump so as to communicate the bottomed holes 7a and 7b. It is a circulation groove. Numeral 9 is a through hole for injecting a filling material formed along the upper surface of the rear edge of the front tank skin 5a, the upper surface of the front edge of the rear tank skin 5b, or the contact surfaces 6a, 6b of the both tank skins 5a, 5b. ,
3b is a fixing member support seat formed on the upper surface of the peripheral portion of the through hole 9, 10 # 10 is an anchor bolt hole provided on the support seat 3b, and 11 # 11 is an outside of both tank skins 5a, 5b. It is a support bolt hole provided in the peripheral part. The gantry base placed on the bottom of the manhole is divided into two in the front-rear direction,
An upper portion of the support rods 13 # 13 erected from a rear portion of the front base 12a and a front portion of the rear base 12b is led out from the anchor bolt holes 10 # 10 to attach an anchor bolt 13a of a fixing member 14 to be described later. # 13a, front part of front base 12a and rear base 12b
When the upper ends of the support bolts 16 # 16 erected from the rear of the support bolts 16 # 16 are fixed in the support bolt holes 11 # 11, the filler material 15 such as mortar is supplied from the injection through holes 9 to both tank skins. After pouring into the hollow portion 5 on the back side of 5a and 5b and solidifying, the reinforcing pressing plate 3c is superimposed on the fixing member support seat 3b to close the pouring hole 9 and further to the upper surface thereof to carry waste water. The fixing member 14 supporting the starting end 3a of the tube 3 is placed and fixed by the anchor bolts 13a to 13a. 17a is an underwater filth pump housed so that the suction port 18 is opened to the lower part in one bottomed hole 7a, and 17b is submerged water housed so that the suction port 18 is opened to the other bottomed hole 7b. Each of the waste pumps has a discharge port 19 detachably connected to the start end 3a of the wastewater discharge pipe 3. 20 is an underwater waste pump 17a, 17
The lifting guide used when loading and unloading b.
a, rear base 12 for supporting the bottom rear surface of the hole of 7b
b is a reinforcing seat protruding from the upper surface of b.

When the inside of the manhole 1 rises to a predetermined starting water level due to the inflow of the wastewater, the first pump 17a is activated to start pumping and discharging the wastewater. After the pumping and discharging work proceeds and the water level reaches the upper edges of the bottomed holes 7a and 7b, the wastewater in the first bottomed hole 7a is discharged and discharged. Due to the pumping and discharging action of the pump 17a, the second
From the bottomed hole 7b through the flow groove 8 to the first bottomed hole 7a
Due to the effect of inflow of wastewater into the inside, the water level in the second bottomed hole 7b starts decreasing in synchronization with the water level in the first bottomed hole 7a. Further, a swirling flow is formed and amplified in the first bottomed hole 7a by the wastewater inflow action through the circulation groove 8,
In addition, the wastewater is swirled up from the peripheral portion along the sloping bowl-shaped inclined surface and descended from the central portion to produce a convection action. Therefore, the suspended matter and sediment in the wastewater are strongly stirred and the pump suction port 18 is discharged.
Will be sucked from. And both bottomed holes 7a, 7
When the water level in b reaches a predetermined stop water level near the hole bottom, the first pump 17a stops. During this time, not only the wastewater in the first bottomed hole 7a but also the wastewater in the second bottomed hole 7b is pumped and discharged through the flow groove 8 in the discharge. This does not mean that the wastewater does not remain in the second bottomed hole 7b when the pump is stopped. That is, the swirl flow forming time is maintained. That is, the stirring time of the suspended matter and the sediment in the first bottomed hole 7a is increased accordingly. Therefore, suspended matter and sediment are easily discharged and discharged together with the wastewater, and do not remain in the tank.

Next, when the water level in the manhole 1 rises again to a predetermined starting water level due to the inflow of the wastewater, the second pump 17b is started to pump and discharge the wastewater, and the water level rises to the bottomed hole 7a. , 7b, the wastewater in the second bottomed hole 7b is pumped and discharged, but the following operation is the same as in the case of starting the first pump 17a described above. Description is omitted because there is.

[0010]

According to the present invention, the tank skin portion of the unit inner tank is formed into two parts in the front-rear direction by resin molding.
Compared to conventional concrete inner tanks, it is extremely lightweight and not bulky, so it is easy to transport it to the site and carry it in through the narrow manhole opening, and the installation work at the bottom of the manhole can be performed smoothly and at low cost. There is an advantage that it can be. In addition, since the inner tank surface is formed smoothly by the resin-molded tank skin and there is no roughness like a concrete inner tank, the scum and sediment can be smoothly sucked by the pump and sent to the wastewater discharge pipe. This has the effect.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a state in which 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 vertical sectional side view taken along line AA of FIG. 2;

FIG. 4 is a plan view of a rear tank skin for constituting the structure of the present invention.

FIG. 5 is a vertical sectional side view taken along line BB of FIG. 4;

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.

FIG. 11 is a vertical sectional side view taken along line CC of FIG. 10;

FIG. 12 is a longitudinal sectional front view of a manhole in which a conventional concrete inner tank is installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 3 Wastewater pumping pipe 3a Starting end of wastewater pumping pipe 3b Fixing member support seat 4 Manhole opening 5 Hollow part 5a Front tank skin 5b Rear tank skin 6a Contact surface 6b Contact surface 7a Open hole 7b Open bottom Hole 8 Flow groove 9 Filling material injection through hole 10 Anchor bolt hole 11 Support bolt hole 12a Front base 12b Back base 13 Support rod 13a Anchor bolt 14 Drainage pumping tube start end support member 15 Filler 16 Support bolt

Claims (1)

[Claims] 1. A tank skin part of a unit inner tank which is carried in from a manhole opening and is installed at the bottom of the manhole via a gantry base to be described later is formed into a two-piece type in a front-rear direction by resin molding. The bottomed hole is recessed and a flow groove is provided for flowing between the bottomed holes, and the rear edge of the front tank skin and the front edge of the rear tank skin are abutting surfaces bent downward, respectively. They are brought into contact with each other from the front and rear and are united. An anchor bolt hole is provided around the through hole, the upper surface thereof is formed on a support seat of a fixing member described later, and a support bolt hole is provided at an outer peripheral edge of both tank skins, and a manhole is provided. The gantry base placed on the bottom is divided into two parts in the front-rear direction, and the rear part and rear part of the front base The upper end of the support rod erected from the front of the base is opposed to the anchor bolt hole, and the upper end of the support bolt erected from the front of the front base and the rear of the rear base is connected to the support bolt hole. In accordance with the state of being fixed, the filler is injected from the injection hole into the hollow portion on the back side of both tank skins and solidified, and the starting end fixing member of the wastewater discharge pipe is placed on the support seat and anchored. A unit internal tank installation structure in a manhole, which is configured to be fixed by bolts.