JPH11131572A - Closing device for public drop pit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a closed state of the connection opening of the outflow side in a public drop pit body not to be easily opened. SOLUTION: This closing device for a public drop pit is provided with a fitting member 25 to close the connection opening of the outflow side of the public drop pit body 1, a fastening member 23 which is transferable in the separating/approaching direction opposite to the fitting member 25, and a ring member to be fastened, arranged between the fastening member 23 and the fitting member 25. The control part 95 of the fastening structure 31 is operated by an adaptable tool to fasten the ring member 27 to be fastened by the fitting member 25 and the fastening member 23 and close the connection opening 5 of the outflow side by the fitting member 25 for closing the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a public drop basin closing device which is detachably mounted in a public drop basin main body and closes an outflow-side connection port of the public drop basin main body.

[0002]

2. Description of the Related Art In general, the end of a drainage pipe in a residential land is connected to a public basin main body, and the main body of the public basin is located in a lower part due to a height difference from a sewage main line laid on a public road outside the residential land. A public drop basin body with an opening formed at the outlet is used.

[0003] This public drop box body has a structure in which, for example, a large-diameter inflow-side connection port is formed in the upper part and a small-diameter outflow-side connection port is formed in the lower part via a reduced-diameter step. .

[0004] A sewage main pipe is connected to an outflow-side connection port of the main body of the public drop box via an attachment pipe or the like.
Drainage from the residential land flows from the drainage pipe in the residential land, through the riser pipe, the main body of the public drop basin, the mounting pipe, etc., to the sewage main pipe, and finally to the sewage treatment plant.

[0005] Here, this drainage system is generally laid at the time of residential land development by laying a sewage main pipe on a public road outside the residential land, branching the mounting pipe from the sewage main pipe, and dropping the mounting pipe into a public drop. Connect to the outlet port of the basin. Next, an opening / closing lid is installed facing the surface of the ground via a rising pipe at an inflow-side connection port of the public drop basin main body that communicates with the sewage main pipe via the mounting pipe. Then, a closing device is detachably attached to a connection port formed in the middle of the rising pipe, and the connection port is closed with the closing tool. Keep it.

After the development of the residential land is completed and the building is constructed, the building is dug down to the vicinity of the connection port of the riser pipe, and the obturator is removed from the connection port of the riser pipe. By connecting the end of the drain pipe through which the drain water flows, the end of the drain pipe in the residential land, the main body of the public drop basin and the sewage main pipe are communicated with each other, and the work of laying the drain system is completed.

However, in the above drainage system, after embedding the public drop basin body communicating with the sewage main pipe and before starting the sewage service, the end of the drainage pipe in the residential land is connected to the sewage system via the public drop basin body. When the drainage is discharged from the residential land, the drainage flows from the drainage pipe in the residential land, through the main body of the public drop basin, etc., to the sewer main pipe, and finally operates. There is a problem that it may flow into a sewage treatment plant that has not been treated.

Further, even when the sewage treatment plant is operating, if the end of the drainage pipe in the residential land is communicated with the sewage main pipe via the main body of the public drop basin without the permission of a municipal sewerage company. However, there is a problem that sewerage facilities are used without permission.

Heretofore, there has been known a method of closing an outflow-side connection port of a buried public drop basin main body using, for example, a plug for a drainage basin described in Japanese Utility Model Publication No. 3-32617.

This plug for drainage basin has an insertion tube fitted into the outflow-side connection port, and has an annular fitting recess formed by fitting an elastic sealing material around the outer periphery of the insertion tube. In addition, a structure is employed in which the opening of the insertion tube is closed by a closed bottom lid having a handle formed on the outer surface.

[0011]

However, in such a plug for a drainage basin described in Japanese Utility Model Publication No. 3-32617, the handle of the bottom lid is grasped, and the handle is moved toward the upper side of the main body of the public drop basin. If pulled, it can be easily pulled out, so that there is a problem that the closed state is easily released.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a closing device for a public drop box which prevents the closed state of the outlet side connection port of the public drop box body from being easily released. The purpose is to:

[0013]

According to a first aspect of the present invention, there is provided a closing device for a public drop box, which is detachably mounted in a public drop box body having an opening formed at an upper part and an outlet-side connection part formed at a lower part. A closing device for a public drop basin for closing the outflow-side connection port portion of the public drop basin main body, the fitting device being fitted to an inner peripheral surface of the outflow-side connection port portion of the public drop basin main body, A closing fitting member that closes the side connection port portion, and is disposed inside the outflow side connection port portion of the public drop box main body so as to be movable in a direction of being relatively opposed to and separated from the closing fitting member. A tightening moving member, a tightened ring member disposed between the tightening moving member and the closing fitting member, and an operating unit operated from the upper side of the public drop box main body. The tightening is performed based on the operation of the operation unit. The moving member is relatively moved toward the closing fitting member, and the tightened ring member is tightened by the closing fitting member and the tightening moving member. A fastening mechanism for pressing against the inner peripheral surface of the outflow-side connection port of the main body.

When closing the outflow-side connection port of the public drop box body, first, the tightened ring member is disposed between the closing fitting member and the tightening moving member. The closing fitting member and the fastening moving member are inserted into the main body of the public drop box, and the closing fitting member is fitted to the inner peripheral surface of the outflow side connection port.

Next, when the operating portion of the tightening mechanism is operated from the upper side of the public drop box main body, the tightening moving member relatively moves toward the closing fitting member based on the operation of the operating portion.

[0016] By the movement of the tightening moving member, the tightened ring member is tightened by the tightening moving member and the closing fitting member, and the outer peripheral surface of the tightened ring member is formed in the outflow side connection port. Press against the peripheral surface.

In this state, the closing fitting member is held by the tightening moving member and the tightened ring member, and the outlet connection port of the public drop box body is closed by the held closing fitting member. You.

It is to be noted that the operation of the operation mechanism of the tightening mechanism is closed and the operation of the operation is performed in the opposite direction to move the tightening moving member relatively in a direction away from the closing fitting member. Release the tightening of the tightened ring member, release the pressure contact between the inner peripheral surface of the outflow side connection port and the outer peripheral surface of the tightened ring member, and make the tightened ring member, the closed fitting member and the tightened moving member public. Take it out of the drop basin and open the outlet port of the public drop basin.

According to a second aspect of the present invention, there is provided the closing device for a public drop box according to the first aspect, wherein the tightening mechanism is provided at a central portion of the closing fitting member from the upper side of the main body of the public drop box. The other end is formed with a screwing portion that is inserted into the insertion hole and is screwed into a screwing hole provided in the center portion of the tightening moving member at one end, and the operating portion operated from the upper side of the public drop box main body is the other end. Is provided with a rotating operation shaft formed in the above.

When the to-be-tightened ring member, the closing fitting member and the fastening moving member are inserted into the main body of the public drop box, the closing fitting member is fitted to the inner peripheral surface of the outflow-side connection port.

Next, when the operating portion of the rotating operation shaft is rotated from the upper side of the public drop box main body, the screwing portion of the rotating operation shaft is rotated in the tightening direction based on the rotating operation of the operating portion. As the screwing portion rotates, the tightening moving member relatively moves toward the closing fitting member.

By the movement of the tightening moving member, the tightened ring member is tightened by the tightening moving member and the closing fitting member, and the outer peripheral surface of the tightened ring member is formed in the outflow side connection port. Press against the peripheral surface.

In this state, the closing fitting member is held by the tightening moving member and the ring member to be tightened, and the outflow side connection port of the public drop box body is closed by the held closing fitting member. You.

On the other hand, when opening the outflow-side connection port of the main body of the public drop box, the operating portion of the rotating operation shaft is turned from the upper side of the main body of the public drop box in the direction opposite to the closing direction. Then, based on the turning operation of the operating portion, the screwing portion of the turning operation shaft turns in the tightening release direction. With the rotation of the screw portion, the tightening moving member relatively moves in a direction away from the closing fitting member.

By the movement of the tightening moving member, the tightening of the tightened ring member by the closing fitting member and the tightening moving member is released, and the outer peripheral surface of the tightened ring member becomes the inner circumferential surface of the outflow side connection port. Move away from the surface. Then, using the rotating operation shaft, the tightened ring member, the closing fitting member, and the tightening moving member are taken out of the public drop box main body, and the outflow side connection port of the public drop box main body is opened.

[0027] The closing device for a public drop box according to claim 3 is the closing device for a public drop box, wherein the main body of the public drop box has an opening at the upper part and a reduced diameter step at the lower part. Forming an outflow-side connection port having a smaller diameter than the upper opening through the portion, the closing fitting member,
A locking portion, which is locked to the reduced-diameter step portion, is formed on a peripheral edge portion so as to protrude.

The tightened ring member, the closing fitting member and the tightening moving member are inserted into the body of the public drop box,
In a state in which the closing fitting member is fitted to the inner peripheral surface of the small-diameter outflow-side connection port, the locking portion projecting from the peripheral edge of the closing fitting member is locked to the reduced-diameter step portion. It is in.

According to a fourth aspect of the present invention, there is provided the closing device for a public drop basin according to any one of the first to third aspects, wherein the closing fitting member comprises an outlet port of the main body of the public drop basin. The fitting tube has a fitting tube portion fitted on the inner peripheral surface of the portion, and the outer peripheral surface of the fitting tube portion is formed as a tapered surface that expands upward.

With the ring member to be fastened, the ring member to be fastened, and the moving member to be fastened, inserted between the closing member and the moving member, the member is inserted into the main body of the public drop box. Then, a force directed inward from the inner peripheral surface of the outflow-side connection port acts on the tapered surface of the fitting cylindrical portion of the closing fitting member, and in this state, the fitting cylindrical portion of the closing fitting member moves. It fits tightly on the inner peripheral surface of the outflow side connection port.

According to a fifth aspect of the present invention, there is provided the closing device for a public drop box according to any one of the second to fourth aspects, wherein the tightening moving member has a detent regulating hole penetrating the upper and lower surfaces. The closing fitting member has a closing substrate portion facing the tightening moving member, and the closing substrate portion has an insertion hole for inserting a screwing portion of the rotation operation shaft at a center portion and a peripheral edge. A rotation preventing projection that is inserted into the rotation restricting hole of the tightening moving member so as to be movable in the vertical direction.

In a state where the tightened ring member is disposed between the closing fitting member and the tightening moving member, the screwing portion of the rotating operation shaft is located at the center of the closing substrate portion of the closing fitting member. It is in a state of being inserted through the provided insertion hole and being screwed into a screw hole provided in the center of the tightening moving member.

In a state where the screwing portion is screwed into the screwing hole, the rotation preventing projection protruding from the peripheral edge of the closing board portion of the closing fitting member is fitted into the rotation stopping regulating hole of the tightening moving member. ,
It is in a state of being inserted movably in the up-down direction.

When the operating portion of the rotating operation shaft is rotated after being inserted into the public drop box main body, the rotation of the rotation preventing projection is restricted by the rotation restricting hole. This prevents the tightening moving member from rotating together with the rotating operation shaft.

According to a sixth aspect of the present invention, there is provided the closing device for a public drop box according to any one of the first to fifth aspects, wherein the closing fitting member and the fastening moving member have upper and lower surfaces respectively. A hole for discharging the condensed water through which the condensed water flows is provided.

Condensed water, such as water droplets, generated by the dew condensation, flows through the condensed water discharge hole, and is discharged outside the public drop basin main body through the outflow side connection port of the public drop basin main body.

A closing device for a public drop box according to a seventh aspect of the present invention is the closing device for a public drop box according to any of the second to sixth aspects, wherein the turning operation shaft protruding from the screwing hole of the tightening moving member is provided. The tip portion is provided with a retaining portion for the tightening moving member.

When opening the outlet side connection port of the main body of the public drop box, if the operation portion of the rotating operation shaft is rotated in the direction opposite to the closing direction, the threaded portion of the rotating operation shaft is turned on. The tightening movement member moves in the tightening release direction.

When the tightening moving member is moved, the movement of the tightening moving member is restricted by the retaining portion provided at the distal end of the rotating operation shaft. Is also restricted, and the tightening moving member is prevented from falling off the rotating operation shaft.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the public drop box closing device of the present invention will be described below with reference to FIGS.

1 to 3, reference numeral 1 denotes a public drop box main body. The public drop box main body 1 is made of, for example, a synthetic resin such as a vinyl chloride resin and has a substantially cylindrical shape which is opened upward and downward. Is molded.

At the upper part of the public drop box main body 1, an inflow-side connection as a large-diameter substantially cylindrical opening having an outer diameter larger than that of the pipe part 2 is provided continuously with the periphery of the upper end of the pipe part 2. The mouth 3 is formed. The inflow side connection port 3 also serves as an inspection cleaning port.

In the lower part of the main body 1 of the public drop box, a step 4 having a truncated conical shape whose diameter is reduced downward is formed continuously with the lower edge of the pipe 2. . Further, a substantially cylindrical outflow-side connection port 5 having a diameter smaller than that of the inflow-side connection port 3 is formed continuously from the lower edge of the reduced-diameter step portion 4.

As shown in FIG. 3, the public drop box body 1 is buried under the surface of a residential land, for example, and an opening / closing lid 9 is provided at the inflow side connection port 3 through a rising pipe 8. , Facing the ground. The riser pipe 8 has a connection port 10 protruding from a substantially central portion in the longitudinal direction, and the connection port 10 is connected to an end of a drain pipe 12 in the residential land.

On the other hand, a mounting pipe 17 is connected to the outflow-side connection port 5 of the public drop box main body 1 via a socket 15 and an elbow 16, and the tip of the mounting pipe 17 is connected to a sewage main pipe (not shown). It is connected.

Then, drainage and the like from the residential land are supplied from the drainage pipe 12 in the residential land to the rising pipe 8, the public drop basin body 1,
The water flows through the socket 15, the elbow 16, and the mounting pipe 17, flows into the sewage main pipe, and finally flows into the sewage treatment plant.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a public drop box closing device.
As shown in FIG. 1, the tightening moving member 23, the closing fitting member 25 facing the tightening moving member 23, and the closing moving member 23 are disposed between the closing fitting member 25 and the tightening moving member 23. A tightened ring member 27 and a tightening mechanism 31 configured to tighten the tightened ring member 27 with the tightening moving member 23 and the closing fitting member 25 are provided.

The tightening moving member 23 is formed of a synthetic resin such as a vinyl chloride resin into a substantially circular plate shape, and the outer diameter thereof is smaller than the inner diameter of the outflow side connection port 5 of the public drop box main body 1. It has dimensions.

The tightening movement member 23 has a substantially circular plate-shaped circular substrate portion 41, and an insertion hole 43 is provided above the thick central portion 42 of the circular substrate portion 41. Below the thick central portion 42 of the circular substrate portion 41, for example, a hexagon nut 45
The screw hole 47 is provided by embedding. This screw hole
47 and the insertion hole 43 are continuous with each other and penetrate the upper and lower surfaces of the thick central portion 42.

In the vicinity of the periphery of the circular substrate portion 41,
On a straight line including the center point of the circular substrate portion 41 and at symmetrical positions from the center point, two detent regulating holes 49 penetrating the upper and lower surfaces are provided.

Further, on the lower surface of the circular substrate portion 41, a rib portion 50 is integrally provided so as to protrude therefrom. The rib portion 50 is formed, for example, by four radially formed portions continuous with the thick central portion 42. It is constituted by a straight rib portion 52 and one circular rib portion 53 formed by connecting the intermediate portions of the four straight rib portions 52 and coaxially with the thick central portion 42.

The circular substrate portion 41 is provided with a relatively small diameter condensed water discharge hole 55 penetrating the upper and lower surfaces.

Further, from the periphery of the circular substrate portion 41,
A frusto-conical clamping edge 56 whose diameter increases downward is integrally provided, and the outer peripheral surface of the clamping edge 56 is formed on a pressing surface 57.

Next, the closing fitting member 25 is formed of a synthetic resin such as a vinyl chloride resin into a substantially circular shape, and the outer diameter thereof is set at the outflow side connection port 5 of the public drop box main body 1.
Is larger than the inner diameter of

The closing fitting member 25 has a substantially circular plate-shaped closing substrate portion 62 which faces the circular substrate portion 41 of the tightening moving member 23. The central portion 64 is provided with an insertion hole 65 penetrating the upper and lower surfaces. The insertion hole 65 has the same diameter as the insertion hole 43 provided in the thick central portion 42 of the circular substrate portion 41 of the tightening moving member 23.

In addition, two detent projections 66 are directed downward on the periphery of the closed substrate portion 62 on a straight line including the center point of the closed substrate portion 62 and at symmetrical positions from the center point. It is protruding.

The detent protrusion 66 is vertically movably fitted into two detent regulating holes 49 provided on the circular substrate portion 41 of the tightening and moving member 23. Each of the detent protrusions 66 is formed in an elongated, hollow, bottomed cylindrical shape.

Further, from the upper surface of the closed substrate portion 62,
The rib portion 70 is integrally provided to protrude, and the rib portion 70 is, for example,
Four straight rib portions 72 formed radially continuously from the thick center portion 64 and an intermediate portion between the four straight rib portions 52 are formed coaxially with the thick center portion. One
And three circular rib portions 73.

The closed substrate portion 62 is provided with a relatively small diameter condensed water discharge hole 75 penetrating the upper and lower surfaces at a position facing the dew water discharge hole 55 provided in the circular substrate portion 41. Have been.

Further, from the periphery of the closed substrate portion 62,
A frusto-conical fastening portion 76 whose diameter increases upward is integrally provided, and an outer peripheral surface of the fastening portion 76 is formed on a pressing surface 77.

Further, a short-sized fitting cylindrical portion 80 fitted to the inner peripheral surface 5a of the outflow-side connection port portion 5 of the public drop box main body 1 is provided integrally with the fastening portion 76. On the outer peripheral surface of the fitting cylindrical portion 80, for example, a 2
A tapered surface 81 having an inclination angle of ° is formed. On the outer peripheral edge of the fitting cylindrical portion 80, for example, a locking portion 83 that is locked to the reduced diameter step portion 4 of the public drop box main body 1 is formed so as to protrude outward over the entire circumference. I have.

Next, the tightened ring member 27 is formed in a substantially ring shape with an elastic material such as synthetic rubber having a sealing property, and the outer diameter thereof is set at the outflow side connection port of the public drop box main body 1. 5 is smaller than the inner diameter.

The inner peripheral surface of the tightened ring member 27 is a pressed surface whose diameter is reduced toward the center, and closes the outlet side connection port 5 of the public drop box main body 1 shown in FIG. In this state, the lower inclined surface of the pressed surface is in pressure contact with the pressing surface 57 of the tightening edge 56 of the tightening moving member 23, and
The inclined surface on the upper side of the pressed surface is pressed against the pressing surface 77 of the tightening portion 76 of the closing fitting member 25.

The outer peripheral surface of the tightened ring member 27 has an outflow-side connection port portion of the public drop box main body 1 when the outflow-side connection port portion 5 of the public drop box main body 1 shown in FIG. 5 is separated from the inner peripheral surface 5a, but in the closed state of the outflow side connection port 5 of the public drop box main body 1 shown in FIG.
It is deformed by being tightened by the and the closing fitting member 25, and is pressed against the inner peripheral surface 5 a of the outflow-side connection port 5 of the public drop box main body 1.

Next, the tightening mechanism 31 is provided with an elongated rotating operation shaft 91 rotatably supported by the tightening moving member 23 and the closing fitting member 25.

The rotary operation shaft 91 has a substantially cylindrical screw portion 92 having a thread groove formed on the outer peripheral surface at a lower end which is one end.
A shaft portion 93 is formed continuously with the screw portion 92, and the shaft portion 93 is formed.
A large-diameter shaft portion 94 having a diameter larger than that of the shaft portion 93 is formed continuously. The large-diameter shaft portion 94 has an outer diameter larger than the insertion hole 65 of the closing fitting member 25, while the screw portion 92 and the shaft portion 93 have an insertion hole of the closing fitting member 25. 65, the size is smaller than the insertion hole 43 of the tightening movement member 23.

The hollow shaft portion is connected to the large-diameter shaft portion 94.
An operation section 95 is provided on the hollow shaft section 96 at the upper end serving as the other end of the rotation operation shaft 91.

Then, the screwing portion 92 of the rotating operation shaft 91 is
An insertion hole 65 of the closing fitting member 25 and an insertion hole 43 of the tightening movement member 23 from the upper side of the public drop box main body 1.
And screwed into a screw hole 47 of the tightening moving member 23.

A washer 98 and a thrust ring 99 are sandwiched between the large-diameter shaft portion 94 of the rotary operation shaft 91 and the thick central portion 64 of the closing fitting member 25. Further, the operation unit 95 of the rotation operation shaft 91 is rotated by a suitable tool (not shown) that engages with the operation unit 95.

Further, the screwing hole 47 of the tightening moving member 23
At the distal end of the threaded portion 92 of the rotary operation shaft 91 protruding downward from the bottom, a retaining portion 100 for the tightening moving member 23 is provided. The retaining portion 100 has, for example, a pin mounting hole at the distal end of the threaded portion.
It is formed by attaching a pin 101 having a length dimension larger than the diameter of the screw hole 47. The tightening mechanism 31 is composed of the rotating operation shaft 91, the screw hole 47, the washer 98, the thrust ring 99, and the like.

Next, the operation of the above embodiment will be described.

The laying of the drainage system is performed, for example, at the time of residential land development.
A sewage main pipe is laid under a public road outside the residential land, a mounting pipe 17 is branched from the sewage main pipe, and this mounting pipe 17 is connected to the outlet side of the public drop basin main body 1 via a socket 15 and an elbow 16. Connect to mouth 5. In addition, a rising pipe 8 is connected to the inflow-side connection port 3 of the public drop box main body 1, and an opening / closing lid 9 is provided.
Is installed.

Further, a closing tool (not shown) is detachably attached to the connection port 10 of the riser tube 8 to close the connection port 10.

Further, the outflow-side connection port 5 of the public drop box main body 1 is closed by the public drop box closing device 21 disposed in the public drop box main body 1.

When the closing device 21 for a public drop box is installed in the body 1 of the public drop box, first, as shown in FIG. 1, the ring member 27 to be tightened, the closing fitting member 25 and the tightening moving member 23 are connected to the public. It is inserted into the drop box main body 1 from above, and the fitting cylinder 80 of the closing fitting member 25 is fitted to the inner peripheral surface 5a of the outflow-side connection port 5. In this state, the closing fitting member
The locking portion 83 projecting from the peripheral edge of the lock 25 is locked to the reduced-diameter step portion 4, and the closing device 21 for the public drop box is held at the outlet port 5 of the public drop box body 1. Is done.

Next, the operating portion 95 of the rotating operation shaft 91 is rotated from the upper side of the public drop box main body 1 using an appropriate tool.

Based on the turning operation of the operating portion 95, the screwing portion 92 of the turning operation shaft 91 is inserted into the screwing hole 47 of the tightening moving member 23.
It rotates in the tightening direction while being screwed. With the rotation of the screw portion 92, the tightening moving member 23 moves toward the closing fitting member 25. That is, it moves upward, which is a direction approaching the closing fitting member 25 fitted to the upper end position of the outflow side connection port 5.

Then, by the movement of the tightening moving member 23, the tightened ring member 27 is tightened by the tightening moving member 23 and the closing fitting member 25, and the inner ring surface of the tightened ring member 27 is formed. The pressing surface is pressed by the pressing surface 57 of the tightening edge 56 of the tightening moving member 23 and the pressing surface 77 of the tightening portion 76 of the closing fitting member 25, and the outer peripheral surface of the tightened ring member bulges. , And is fixed in a state of being pressed against the inner peripheral surface 5a of the outflow side connection port 5.

In this state, the closing fitting member 25 is held at the outflow side connection port 5 by the tightening moving member 23 and the tightened ring member 27, and the held closing fitting member 25 is used as shown in FIG. As shown, the outflow connection port 5 is closed.

The closing device 21 for the public drop box is
The public drop box main body 1, the riser pipe 8, etc., whose outlet connection port 5 has been closed at the above, are once again buried in the ground.

Then, after the residential land development has been completed and the building has been constructed, the vicinity of the connection port of the rising pipe 8 is dug down, and the obturator is removed from the connection port 10 of the rising pipe 8. The end of a drain pipe 12 for flowing drain water from a building in the residential land is connected to the unit 10.

On the other hand, the public drop basin closing device 21 attached to the outflow side connection port 5 of the public drop basin main body 1 is removed by a sewage company or the like having a compatible tool at the time of starting the operation of the sewage facility.

That is, when the outlet side connection port 5 of the public drop box main body 1 is to be opened, the opening / closing lid 9 installed on the riser pipe 8 is opened, and the operating part 95 of the rotary operation shaft 91 is adjusted using a suitable tool. Then, it is rotated in the direction opposite to the direction of closing.

Based on the turning operation of the operating portion 95, the screwing portion 92 of the turning operation shaft 91 turns in the tightening release direction. With the rotation of the screwing portion 92, the tightening moving member 23 moves downward, that is, in the direction away from the closing fitting member 25.

Then, by the movement of the tightening moving member 23, the tightening of the tightened ring member 27 by the closing fitting member 25 and the tightening moving member 23 is released, and the outer peripheral surface of the tightened ring member 27 is moved to the outflow side. The pressing and fixing of the peripheral edge of the tightening moving member 23 is released away from the inner peripheral surface 5a of the connection port 5. Then, using the rotating operation shaft 91, the tightened ring member 27, the closing fitting member 25, and the tightening moving member 23 are taken out of the public drop box main body 1, and the outflow side connection port of the public drop box main body 1 is taken out. 5 is opened.

As described above, according to the embodiment, the tightened ring member 27, the closing fitting member 25, and the tightening moving member 23 are inserted into the public drop box main body 1, and
When the closing fitting member 25 is fitted to the inner peripheral surface 5a of the outflow side connection port 5 and the operating portion 95 of the rotating operation shaft 91 of the tightening mechanism 31 is rotated by a suitable tool, the tightening moving member 23 is closed. Mating member 25
Moves upward, and by the movement of the tightening moving member 23, the tightened ring member 27 is tightened by the closing fitting member 25 and the tightening moving member 23, and the outer peripheral surface of the tightened ring member 27 is It is fixed in a state of being strongly pressed against the inner peripheral surface 5a of the outflow side connection port 5.

Therefore, compared with the conventional plug which is simply held in a fitted state, the closing fitting member 25 can be easily and strongly fitted and fixed, and the outflow side connection port of the public drop box main body 1 can be held. 5 can be securely closed by the closing fitting member 25, and it is difficult to operate the operating section 95 of the rotary operation shaft 91 by means other than the appropriate tool. Therefore, the closed state is not easily released and without permission. Since it is possible to prevent the closed state of the outflow-side connection port 5 from being released, it is possible to reliably prevent the drainage from flowing into the sewage treatment plant that has not been operated yet, and to use the sewage facilities without permission.

Further, from the closed state of the outflow side connection port 5,
Only by rotating the operation portion 95 of the rotation operation shaft 91 of the tightening mechanism 31 in the opposite direction to the case of closing, the tightening movement member 23
Is moved downward in a direction away from the closing fitting member 25 to release the tightening of the tightened ring member 27 by the closing fitting member 25 and the tightening moving member 23, and press the peripheral edge of the tightening moving member 23 into pressure contact. Since the fixation can be released, the outflow-side connection port 5 of the public drop box main body 1 can be easily and reliably opened, and further, by using the rotating operation shaft 91, it is easy to move out of the public drop box main body 1. Can be taken out.

Further, a locking portion is provided on the peripheral portion of the closing fitting member 25.
When the closing fitting member 25 is fitted to the inner peripheral surface 5a of the outflow-side connection port 5, the locking portion 83
Is locked to the reduced-diameter step portion 4, so that the public drop box closing device 21 itself can be easily positioned, and can be prevented from dropping below the outlet side connection port 5.

Further, since the tapered surface 81 is formed on the outer peripheral surface of the fitting tube portion 80 of the closing fitting member 25, insertion can be facilitated, and the fitting tube portion 80 of the closing fitting member 25 flows out. In the state fitted to the inner peripheral surface 5a of the side connection port 5, this tapered surface
Since a relatively large force acts between the inner peripheral surface 5a of the outflow side connection port 5 and the inner peripheral surface 5a of the outflow side connection port 5, the fitting cylindrical portion 80 is securely connected to the inner peripheral surface 5a of the outflow side connection port 5. The close fitting can be performed, the closing device 21 for the public drop box can be reliably positioned, and the turning operation shaft 91 of the tightening mechanism 31 can be prevented from turning when the operating portion 95 is operated, and the operability is excellent.

Further, the tightening and moving member 23 has a rotation preventing regulating hole 49, and the closing board portion 62 of the closing fitting member 25.
In order to protrude the rotation-stop projection 66, the rotation of the rotation-stop projection 66 is restricted by the rotation-restriction restriction hole 49 when the operation unit 95 of the rotation operation shaft 91 is operated. The rotation of the tightening movement member 23 together with the rotation operation shaft 91 can be easily and reliably prevented, and the operability is excellent.

Further, since the condensed water discharging holes 55 and 75 penetrating the upper and lower surfaces of the closing fitting member 25 and the tightening and moving member 23 are formed, the generated condensed water is discharged from the condensed water discharging holes.
After flowing through 55 and 75, it is discharged to the outside of the public drop box main body 1 through the outflow side connection port 5 of the public drop box main unit 1. Therefore, it is possible to prevent the condensation water from accumulating in the public drop basin body 1.

Further, since the retaining portion 100 is provided at the distal end of the rotating operation shaft 91, when the operating portion 95 of the rotating operation shaft 91 is operated, the rotation preventing shaft 100 is rotated by the retaining portion 100. Since the moving operation is restricted, it is possible to prevent the fastening moving member 23 from falling off the rotating operation shaft 91 and falling.

Further, the tightening mechanism 31 has a screwing portion 92 screwed into the screwing hole 47 of the tightening moving member 23 at the lower end and a rotating operation shaft 91 having an operating portion 95 at the upper end. The structure can be simple and easy to manufacture.

In the above-described embodiment, a description has been given of the configuration in which the locking portion 83 of the closing fitting member 25 is formed so as to protrude from the upper peripheral edge of the fitting cylindrical portion 80 over the entire circumference.
It is also possible to adopt a configuration in which, instead of the entire circumference of the upper edge of the 80, a portion of the upper edge is formed, for example, at three locations at equal intervals, so that raw materials can be reduced and material costs can be reduced. it can.

In the above-described embodiment, the diameter-reducing step 4 of the public drop box main body 1 is an inclined surface whose diameter is reduced downward, but may be a horizontal surface instead of the inclined surface.

Further, in the above embodiment, the configuration in which the opening at the top of the public drop box main body 1 is the inflow-side connection port 3 also serving as an inspection cleaning port has been described. However, as shown in FIG. The opening at the upper part of the public drop box main body 1a may be an inspection port 3a, and the inflow side connection port 110 may be formed to project from the peripheral surface of the pipe 2 of the public drop box main body 1a. In addition, an opening / closing lid 9 is installed at the inspection port 3a so as to face the ground via a rising pipe 8a.
110 is connected to the end of the drain pipe 12 in the residential land.

The public drop box main body 1a shown in FIG. 4 is also provided with the public drop box closing device 21 detachably mounted in the public drop box main body 1a.
The outflow-side connection port 5 of the public drop box main body 1a can be closed so as not to be released without permission.

[0098]

According to the first aspect of the present invention, the tightened ring member, the closing fitting member and the fastening moving member are inserted into the main body of the public drop box, and the closing fitting member is connected to the outlet side connection port. When the operating portion of the tightening mechanism is operated in a state of being fitted to the inner peripheral surface, the tightened ring member is tightened by the closing fitting member and the tightening moving member, and the outer peripheral surface of the tightened ring member is on the outflow side. Since it is in pressure contact with the inner peripheral surface of the connection port, the closing fitting member can be held in a strongly fitted and fixed state compared with a plug body simply held in a fitted state as in the related art, and the The outflow side connection port can be reliably closed by the closing fitting member, and the closed state can be prevented from being easily released.

[0099] According to the second aspect of the present invention, the tightening mechanism has at one end a screwing portion screwed into the screwing hole of the tightening moving member, and has a rotating operation shaft formed with the operating portion at the other end. Because of this, the structure can be simplified and can be easily manufactured.

According to the third aspect of the present invention, when the closing fitting member is fitted to the inner peripheral surface of the outflow side connection port, the locking portion projecting from the peripheral edge is locked to the reduced diameter step portion. In this state, the closing device for the public drop box can be easily positioned, and can be prevented from dropping below the outlet-side connection port.

According to the fourth aspect of the present invention, since the outer peripheral surface of the fitting cylindrical portion of the closing fitting member is formed as a tapered surface, insertion can be facilitated. In the state of being fitted to the inner peripheral surface of the outflow-side connection port, a relatively large force acts between the tapered surface of the closing fitting member and the inner peripheral surface of the outflow-side connection port. The fitting tube portion can be securely fitted to the inner peripheral surface of the outflow side connection port portion, and the closing device itself for the public drop box can be reliably positioned, and rotation of the operation portion of the tightening mechanism during operation can be prevented. .

According to the fifth aspect of the present invention, when the operation portion of the rotation operation shaft is operated, the rotation of the rotation preventing projection is restricted by the rotation preventing restricting hole, and the rotation is restricted by the tightening movement together with the rotation operation shaft. Rotation of the member can be easily and reliably prevented.

According to the sixth aspect of the present invention, the condensed water generated flows through the condensed water discharge hole, and is discharged to the outside of the public drop box main body through the outflow side connection port of the public drop box main unit. You. Therefore, it is possible to prevent condensation water from accumulating in the main body of the public drop basin.

According to the seventh aspect of the present invention, when operating the operation portion of the rotation operation shaft, the rotation operation of the rotation operation shaft is restricted by the retaining portion, and the tightening moving member is moved by the rotation operation shaft. It can be prevented from falling off and falling off, and is excellent in operability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a closing device for a public drop box according to the present invention.

FIG. 2 is a cross-sectional view showing the closing device for the public drop basin, showing the outflow-side connection port of the main body of the public drop basin;

FIG. 3 is a side view of a drainage system including a public drop box main body to which the public drop box closing device is attached.

FIG. 4 is a side view of a drainage system including another main body of the public drop basin to which the closing device for the public drop basin is attached.

[Explanation of symbols]

 1, 1a Public drop basin main body 3 Inlet connection port as opening 3a Inspection port as opening 4 Reduced diameter step 5 Outflow side connection port 5a Inner peripheral surface 21 Blocking device for public drop basin 23 Tightening movement Member 25 Closure fitting member 27 Tightened ring member 31 Tightening mechanism 47 Screw hole 49 Non-rotating restriction hole 55, 75 Condensed water discharge hole 62 Blocking board part 65 Insertion hole 66 Non-rotating projection part 80 Fitting cylinder part 81 Taper Surface 83 Locking part 91 Rotating operation shaft 92 Screw part 95 Operation part 100 Retaining part

Claims (7)

[Claims] 1. A public drop box main body having an opening formed at an upper part and an outflow side connection port formed at a lower part so as to be detachable, and closing the outflow side connection port of the public drop cell body. A closing device for a public drop basin, which is fitted to an inner peripheral surface of the outflow-side connection port of the public drop basin main body and closes the outflow-side connection port; A tightening moving member disposed inside the outflow-side connection port of the main body so as to be movable in a direction of relatively approaching and separating from the closing fitting member; and the tightening moving member and the closing fitting member. A member to be tightened disposed between the member, and an operating unit operated from the upper side of the public drop box main body, and the tightening moving member is connected to the closing fitting member based on the operation of the operating unit. Move relatively toward A tightening mechanism that tightens the tightened ring member with the closing fitting member and the tightening moving member, and presses the outer peripheral surface of the tightened ring member against the inner peripheral surface of the outflow-side connection port of the public drop box body. And a closing device for a public drop box. 2. The fastening mechanism is inserted from the upper side of the main body of the public drop box into an insertion hole provided at the center of the closing fitting member and screwed into a screw hole provided at the center of the fastening moving member. 2. A public drop basin according to claim 1, further comprising a rotary operation shaft having a threaded portion formed at one end and an operation portion operated from the upper side of the public drop basin main body formed at the other end. Occlusion device. 3. The public drop box main body has an opening at an upper portion and an outlet-side connection portion having a smaller diameter than the upper opening through a reduced-diameter step portion at a lower portion. 3. A locking portion, which is locked to the step of reducing the diameter, protrudes from a peripheral portion thereof.
The closing device for a public drop box described in the above. 4. The closing fitting member has a fitting tubular portion fitted to an inner peripheral surface of an outflow-side connection port portion of the public drop box main body, and an outer peripheral surface of the fitting tubular portion is upward. The closing device for a public drop basin according to any one of claims 1 to 3, wherein the closing device is formed on a tapered surface expanding toward the front. 5. The tightening moving member has a detent regulating hole penetrating in upper and lower surfaces, the closing fitting member has a closing substrate portion facing the tightening moving member, and the closing substrate portion has A center hole is provided with an insertion hole through which the threaded portion of the rotation operation shaft is inserted, and a detent projection is provided on the periphery of the detent regulating hole of the tightening and moving member so as to be vertically movable. The closing device for a public drop box according to any one of claims 2 to 4, characterized in that: 6. The condensed water discharging hole for allowing the condensed water to flow therethrough on the upper and lower surfaces of the closing fitting member and the tightening moving member, respectively. Closure device for public drop basin. 7. The fastening operation member according to claim 2, wherein a stopper portion of the fastening operation member is provided at a distal end portion of the rotation operation shaft protruding from a screwing hole of the fastening operation member. The closing device for a public drop box described in the above.