KR101132847B1 - a Prevention apparatus of rain and sand inflow with a buoyancy chamber - Google Patents

Abstract

The present invention relates to a rainwater and sediment inflow prevention device having a buoyancy chamber, to provide a buoyancy chamber in the interior of the opening and closing plate so that the clear water flowed back by the rise of the river and river water level does not flow into the rainwater toil, and also opening and closing An opening stopper provided to control the opening angle of the plate is arranged at the lower part of the opening and closing plate to prevent the opening and closing plate from closing due to the contaminants to prevent the loss of rainwater prevention function, and as the average amount of sewage changes, the rotating shaft and the horizontal The opening angle of the opening and closing plate can be adjusted by varying the position of the holding stopper.

Rainwater soil, sewer, drainage, stopper, opening and closing board, contaminants, earth and sand, buoyancy

Description

Rain and sand inflow with a buoyancy chamber

The present invention relates to a rainwater and sediment inflow prevention device having a buoyancy chamber, more specifically, the frame seated in one or more sewage inlet hole formed in the rainwater soil provided on the discharge side of the sewage; and the horizontal of the sewage inlet A rotating shaft coupled across the inside of the frame along a direction; and an opening and closing plate arranged on the rotating shaft and opening and closing the sewage inlet hole according to the amount of sewage; and a closed state of the opening and closing plate coupled to the other side of the frame. In the rainwater and earth and sand intake prevention device consisting of a horizontal holding stopper for intermittent and an open stopper for intermittent opening angle of the opening and closing plate, the opening stopper is disposed transversely across the other side of the opening and closing plate, Lifted by the height adjusting means coupled to the upper surface of both sides of the frame is configured to interrupt the opening angle of the opening and closing plate, the opening and closing plate is Relates to a solid having a buoyancy chamber, characterized in that a buoyancy chamber formed on a part and the soil inflow prevention apparatus.

In general, sewerage refers to a passage for draining sewage generated from household sewage, factory wastewater from factories and workplaces, and rainwater collected through road drains.

In particular, the sewer flows into the river because the discharge side is connected to the river.

That is, a conventionally known sewage furnace includes rainwater silos to purify the sewage flowing into the discharge side, and includes a sewer drainage leading to a sewage treatment plant through a connection pipe connected to rainwater sills.

At this time, one or more sewage inflow holes are formed in the rainwater discharge chamber, and the sewage inflow prevention device is provided in the sewage inflow hole. In addition, the soil inflow prevention device is configured to further install a screen net to prevent foreign matters such as contaminants from flowing into the superior soil chamber.

On the other hand, the sediment inflow prevention device guides the sewage flowing into the sewage drain to the sewage treatment plant, and when the amount of sewage increases more than three times due to rainwater, the rainwater sediment is closed and discharged to the river or river.

Hereinafter, the problem of the "soil inflow prevention device using buoyancy" of the Republic of Korea Patent Application No. 2005-0119688 filed in the prior art will be described.

Figure 7 is a cross-sectional view of the conventional "soil inflow prevention device using buoyancy".

As illustrated in FIG. 7, the anti-soil inflow prevention apparatus using the buoyancy previously applied is a structure in which a plurality of buoyancy cylinders are provided on the rear upper portion of the opening and closing plate 3 to control the opening and closing state of the opening and closing plate 3. .

This structure is such that when the water level of the river rises due to the rain, the outer surface of the buoyancy tank (3f) and the river water level surface is in contact with the rear of the opening and closing plate (3) due to the buoyancy generated by the buoyancy cylinder (3f) Will rise to the top.

Therefore, as the rear of the opening and closing plate 3 rises, the opening and closing plate 3 is in a horizontal state, and the sewage is discharged by intermittent opening and closing of the sewage inflow hole 711 formed in the rainwater discharge chamber 71. And it is to prevent the earth and sand to be introduced into the rainwater chamber (71).

However, the conventional soil inflow prevention device using buoyancy has a problem that the buoyancy bucket is exposed to the outside, which may be damaged, and also the buoyancy bucket has a small sewage inflow space area, so that part of the sewage is buoyant bucket (3f) and opening and closing plate There was a problem to flow into the river past (3).

In addition, there is a problem that the closing plate (3) is not closed when the sewage amount is increased due to the seizure of sewage caught in the buoyancy cylinder (3f).

Hereinafter, the problem of the "soil inflow prevention device of the tea house" of the Republic of Korea Patent Application 2005-0113748 previously filed will be described.

8 is a cross-sectional view of a conventional "soil inflow prevention device of the collecting pipe".

As illustrated in FIG. 8, the soil inflow preventing apparatus of the previously-collected dust collector is provided with an opening stopper 5 located on the other inner wall side of the sewage inlet hole 711, and supports a bearing bracket BB supporting the rotating shaft 2. The sub support frame 12 for fixing the structure is fixed to the one side wall surface and the other side wall surface of the sewage inlet hole 711 in the longitudinal direction.

In such a structure, when the amount of sewage increases more than three times in the rainy season, sewage from the sewage flowing through the opening / closing plate 3 is normally opened through the opening stopper 5 and the sub support frame. A debris is caught by 12, and the opening-and-closing board 3 is impossible to close.

This is a problem that if the switchboard is not closed, rainwater flows into the sewage terminal treatment plant through rainwater tosoil, the rainwater and soil inflow prevention function is lost.

Hereinafter, the problem of the "soil inflow prevention device having a height adjustment means" of the Republic of Korea Patent Application No. 2005-0113747 filed in the prior art will be described.

Figure 9 is a cross-sectional configuration of the conventional "soil inflow prevention device having a height adjustment means".

As illustrated in FIG. 9, the soil inflow preventing apparatus provided with the previously applied height adjusting means includes a height adjusting means 6 and an open stopper 5 which is lifted by the height adjusting means 6. It is the structure located in the other side wall of 711.

This configuration, although the closing plate (3) should be closed when the sewage of the sewage flowing through the opening and closing plate (3) is caught by the open stopper (5) and the height adjusting means (6) more than three times the rainwater and the amount of sewage. Opening and closing plate (3) was not closed due to the contaminants, there was a problem that the rainwater and sewage flows to lose its function.

Patent applications 2005-0119688, patent applications 2005-0113747, and patent applications 2005-0113748, which are conventionally filed as described above, in addition to the above problems, in order to control the amount of sewage inflow according to the change in the average amount of sewage, the opening and closing plate and horizontal The position of the holding stopper should be changed. At this time, the position adjustment of the horizontal holding stopper had a problem in that the horizontal holding stopper was separated from the frame and then reassembled after drilling a new coupling hole.

In addition, the position adjustment of the opening and closing plate is to remove the frame from the sewage inlet hole, separate the rotating shaft from the frame again, change the position of the rotating shaft to adjust the position of the opening and closing plate, and reconstruct the frame in the sewage inlet hole there was.

This is because the bearing bracket coupled to the end of the rotating shaft is fixed to the outer surface of the frame, so when the position of the opening and closing plate is changed, the frame must be separated from the sewage inlet hole.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a buoyancy chamber inside the opening and closing plate so that the clear water flowed back due to the elevation of rivers and rivers does not flow into the stormwater chamber. In addition, an opening stopper provided to control the opening angle of the opening and closing plate is disposed at the lower portion of the opening and closing plate to prevent the closing of the opening and closing plate due to the contaminants, and to prevent the loss of rainwater inflow prevention function. It relates to a rainwater and earth inflow prevention device having a buoyancy chamber characterized in that the opening angle of the opening and closing plate can be adjusted by varying the position of the rotating shaft and the horizontal holding stopper.

Rainwater and earth and sand inlet prevention device having a buoyancy chamber according to the first embodiment of the present invention for achieving the above object is a frame seated in one or more sewage inlet hole formed in the rainwater toil provided on the discharge side of the sewer; And a rotating shaft coupled across the inside of the frame along a transverse direction of the sewage inlet hole; and an opening and closing plate arranged on the rotating shaft and opening and closing the sewage inlet hole according to the amount of sewage; and coupled to the other side of the frame. In the rain and earth inflow prevention device comprising a horizontal holding stopper for intermittently closing the opening and closing state of the opening and closing plate, and an open stopper for controlling the opening angle of the opening and closing plate,

The opening stopper is disposed across the other side lower portion of the opening and closing plate in a transverse direction, and is elevated by height adjusting means coupled to both upper surfaces of the frame is configured to interrupt the opening angle of the opening and closing plate, the opening and closing plate is A buoyancy chamber is formed therein.

Furthermore, the rainwater and sediment inflow prevention device having a buoyancy chamber according to the second embodiment of the present invention for achieving the above object is seated in one or more sewage inlet hole formed in the rainwater toil provided on the discharge side of the sewer. A frame; and a rotating shaft coupled across the inside of the frame along a transverse direction of the sewage inlet hole; and an opening and closing plate arranged on the rotating shaft and opening and closing the sewage inlet hole according to the amount of sewage; and the other side of the frame. In the rain and earth inflow prevention device is composed of a horizontal holding stopper coupled to the intermittent to control the closed state of the opening and closing plate, and an opening stopper to control the opening angle of the opening and closing plate,

The frame is coupled to a single rotary shaft to rotate together, and provided with a plurality of opening and closing plate for opening and closing the sewage inlet hole according to the amount of sewage,

 The inner center of the frame is connected in the longitudinal direction to partition each opening and closing plate, and provided with a support frame to prevent the sag of the rotating shaft,

The open stopper is disposed to cross the other lower portion of the opening and closing in the transverse direction, is lifted by the height adjusting means coupled to the upper surface of both sides of the frame is configured to interrupt the opening angle of the opening and closing plate,

The opening and closing plate is characterized in that the buoyancy chamber is formed therein.

According to the rainwater and sediment inflow prevention device having a buoyancy chamber according to the present invention to provide a buoyancy chamber functioning as a conventional buoyancy cylinder in the opening and closing plate without affecting the sewage inflow space area, and also prevents the catch of clutter It is also possible to increase the durability.

In addition, the opening stopper is arranged to be elevated in the lower part of the opening and closing plate, and the sub support frame is also coupled to the cantilever shape along the inner longitudinal direction of one side so as to be located at the central portion of the opening and closing plate so that sewage contaminants are caught on the opening stopper so that the opening and closing plate is not closed. There is a feature that can prevent the problem.

In addition, as the average amount of sewage is changed, the position of the rotating shaft attached to the bottom of the opening and closing plate and the position of the horizontal maintenance stopper coupled to the frame can be easily changed.

Hereinafter, with reference to the accompanying drawings with respect to the rain and earth inflow prevention device having a buoyancy chamber according to the present invention will be described in detail.

1 is a block diagram showing a rainwater and sediment inflow prevention device having a buoyancy chamber according to the first embodiment of the present invention is installed, Figure 2 is a rainwater and sediment inflow prevention apparatus having a buoyancy chamber extracted in Figure 1 3 is a perspective view illustrating a state in which the opening and closing plate is separated in FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA of FIG. 2.

As shown in Figures 1 to 4, rainwater and earth and sand inlet prevention device having a buoyancy chamber according to the present invention is provided on the discharge side of the sewer (7) rainwater toil containing one or more sewage inlet hole (711) Installed in (71), the rainwater sediment (71) is connected to the tea house conduit (73) associated with the sewage end treatment plant through a connecting pipe (72), in particular rainwater and earth and sand to the sewage inlet hole 711 during rainy weather It is a structure that can prevent inflow.

Rainwater and earth and sand inflow prevention device having such a buoyancy chamber is provided with a buoyancy chamber (3e) inside the opening and closing plate (3) so that the clear water flowing back by the rise of the river and river water level does not flow into the rainwater toil (71). In addition, the positions of the opening and closing plate 3 and the horizontal holding stopper 4 can be changed according to the average amount of sewage, and the foreign matter contained in the sewage is caught by the opening stopper 5 so that the opening and closing plate 3 cannot be opened or closed. It is a device that does not solve the problem.

The rainwater and earth and sand inflow prevention device having the buoyancy chamber is composed of six parts, which is a frame (1) having a buoyancy chamber (3e), a rotating shaft (2) installed on the frame (1), and the rotating shaft (2) the opening and closing plate (3) fixed and opened, the horizontal holding stopper (4) provided on the frame (1) to intercept the horizontal of the opening and closing plate (3), and the opening angle of the opening and closing plate (3) It consists of a height adjustment means 6 to control the.

The rotation shaft 2 is coupled across the inside of the frame 1 along the transverse direction of the sewage inlet hole 711.

In addition, the opening and closing plate 3 is installed on the rotating shaft 2, and functions to open and close the sewage inflow hole 711 according to the amount of sewage and rainwater.

In addition, the opening and closing plate 3 has a structure in which a plurality of partition plates 3c are further provided therein to prevent sag and a plurality of buoyancy chambers 3e can be formed.

The opening and closing plate 3 is separated into an upper plate 3a and a lower plate 3b, and after the plurality of buoyancy chambers 3e are provided through a plurality of partition plates 3c therein, side plates (4) are provided on four sides. 3d) finish and welded together.

Such a structure is such that even if one part of the opening and closing plate 3 is broken and the function of the buoyancy is lost, the other buoyancy chamber 3e can make up for it and maintain the function of the buoyancy.

In addition, the opening and closing plate 3 may be provided with a plurality of buoyancy chambers 3e therein, thereby maintaining the sewage inflow space area as it is and preventing it from being caught by contaminants.

Meanwhile, in another embodiment, the opening and closing plate 3 may be made of a plastic resin material to further increase the function of buoyancy.

Here, the function of the opening and closing plate 3 having a buoyancy function is as follows.

When the water level of the river rapidly rises due to rain, the rear plate of the opening and closing plate rises upward due to the buoyancy generated by the buoyancy chamber 3e while the opening and closing plate 3 is submerged due to the backflowing clear water.

Therefore, as the rear of the opening and closing plate 3 rises, the opening and closing plate 3 is in a horizontal state, and the sewage is discharged by intermittent opening and closing of the sewage inflow hole 711 formed in the rainwater discharge chamber 71. And it is to prevent the earth and sand to be introduced into the rainwater chamber (71).

At this time, even if any one of the plurality of buoyancy chamber (3e) formed in the opening and closing plate (3) is broken and the function of the buoyancy is lost, the other buoyancy chamber (3e) is able to make up for it to maintain the function of buoyancy.

Meanwhile, the rotating shaft 2 is fixed to both inner sides of the frame 1 through bearing brackets BB coupled to both ends thereof so as to be rotatable. Through this structure, the opening and closing plate 3 is provided with a structure that can be opened and closed by rotating together with the rotation shaft (2).

In addition, the lower plate 3b of the opening and closing plate 3 has a structure in which one or more front weights 31 and rear weights 32 are further provided on one lower side and the lower side of the other side.

Here, the front and rear weights 31 and 32 are nut 311 fixed to the opening and closing plate 3 to be provided with a stepped hole in the longitudinal direction, and the front and rear positions are adjusted by being longitudinally fastened to the nut 311. Consists of a spiral weight 312 to vary the falling weight of the front / rear around the rotating shaft (2) through.

Through such a configuration, by adjusting the eccentric weight of the opening and closing plate (3) according to the sewage and rainwater to provide a structure that can adjust the opening angle by its own weight.

In addition, the opening and closing plate 3 is a structure that can be changed in position with respect to the frame (1) to adjust the amount of sewage inflow according to the average amount of sewage.

To this end, the frame 1 further includes a support bracket 13 in which a long groove H is formed to adjust the position of the bearing bracket BB such that the position of the rotation shaft 2 is variable.

The support bracket 13 is fixed to both inner sides of the frame 1 and has a structure in which bearing brackets BB coupled to both ends of the rotation shaft 2 are fixed on the long grooves H.

Therefore, when changing the position of the opening and closing plate 3, it is possible to move only the rotary shaft 2 on the long groove (H) of the support bracket 13 without separating the frame 1 to the sewage inlet hole (711).

In addition, the horizontal holding stopper 4 is coupled to the other side of the frame (1) to function to control the closed state of the opening and closing plate (3).

The horizontal holding stopper 4 is a structure in which a plurality of recessed grooves 41 are continuously formed in a zigzag to facilitate the inflow of sewage at one end.

At this time, the horizontal maintenance stopper 4 also has a structure in which a plurality of long grooves (H) whose position is variable so that the amount of sewage inflow can be adjusted according to the amount of sewage.

In addition, the open stopper (5) is arranged to cross the lower side of the other side of the opening and closing plate 3 in a transverse direction so as to raise and lower the opening angle of the opening and closing plate (3).

The open stopper 5 takes an elongated " bar " shape and is lifted by the height adjusting means 6 coupled to both sides of the frame 1.

The height adjusting means (6) is freely rotatable on the bottom surface of the open stopper (5) so as to lift the open stopper (5) and the ball screw (61) inserted in a vertical downward direction on both sides of the frame (1) And a lifting nut 62 attached thereto.

That is, both sides of the open stopper (5) is suspended in the air by two ball screws (61), the ball screw 61 is a structure exposed to the upper portion of the frame (1). This structure is a structure in which the lifting nut 62 is elevated by the forced rotation of the ball screw 61, and as a result, the opening stopper 5 is elevated.

Here, the opening stopper 5 is disposed at the lower side of the other side of the opening and closing plate 3, and the other side of the opening and closing plate 3 adjusts the opening angle of the opening and closing plate 3 while lifting up in the open state inclined by its own weight. Function.

As a result, the height of the lifting stopper 5 is adjusted by the ball screw 61 exposed to the frame 1, so that the opening angle of the opening and closing plate 3 is easily adjusted by adjusting the height of the opening stopper 5. Can be.

On the other hand, the frame 1 is a structure that is further provided with a sub-support frame 12 coupled in a cantilever shape along one side longitudinal direction to be located in the central portion of the opening and closing plate (3).

The sub support frame 12 is for preventing the deflection of the rotation shaft 2, the bearing bracket (BB) arranged on the rotation shaft 2 is fixed to the upper surface, to change the position of the bearing bracket (BB) The long groove (H) is formed for.

Conventionally, the earth and sand inflow prevention device has an open stopper 5 located on the other side wall of the sewage inflow hole 711, and the sub support frame 12 for fixing the bearing bracket BB is a type of the sewage inflow hole 711. It is installed in the direction, the closing plate (3) should be closed when the sewage of the sewage flowing through the opening and closing plate (3) is caught by the open stopper (5) and the sub support frame (12) more than three times the rainwater and the amount of sewage. In spite of the fact that the opening and closing plate 3 is not closed by the miscellaneous material and the excellent blocking function is lost,

The opening stopper 5 of the rainwater and earth and sand inflow prevention device having the buoyancy chamber according to the first embodiment of the present invention is located under the opening and closing plate 3, and the sub support frame 12 is also the center of the opening and closing plate 3. It is coupled to the cantilever shape along one inner longitudinal direction so as to be located at the site, so that the contaminants contained in the sewage are not caught by the sub support frame 12 and the open stopper 5.

In addition, the rain and earth inflow prevention device having a buoyancy chamber according to the first embodiment of the present invention can change the position of the opening and closing plate 3 and the horizontal holding stopper (4) on the frame (1) in accordance with the change in the average amount of sewage have.

Here, the position of the opening and closing plate is possible by the long groove (H) formed in the support bracket 13 and the long groove (H) formed in the sub support frame 12, the position change of the horizontal holding stopper (4) is a horizontal holding stopper It is possible by the long groove H formed in (4).

Hereinafter, in the second embodiment, the contents described in the first embodiment will be omitted, and the description will be focused on the newly added components.

5 is a perspective view showing a state in which the opening and closing plate is separated from the perspective view of the rainwater and earth and sand inflow prevention device having a buoyancy chamber according to a second embodiment of the present invention,

As shown in FIG. 5, the rainwater and soil inflow prevention device having the buoyancy chamber according to the second embodiment has a structure in which one or more opening and closing plates 3 are installed in a single frame 1. In the second embodiment it will be described that the two opening and closing plates 3 are installed in a single frame (1).

Here, the pair of opening and closing plate 3 is coupled to a single rotating shaft (2) is a structure that rotates in accordance with the sewage and rainwater.

At this time, the inner center of the frame (1) is connected in the longitudinal direction to partition each opening and closing plate (3), the structure is provided with a support frame (11) to prevent the sag of the rotating shaft (2).

A bearing bracket BB supporting the rotating shaft 2 is downwardly coupled to the bottom of the supporting frame 11 to prevent sagging of the rotating shaft 2.

This structure reinforces the frame 1 through the support frame 11 and prevents the sag of the rotation shaft 2 through the bearing bracket BB coupled downwardly to the support frame 11. Thereby, in addition to the above functions, a structure capable of preventing the jams contained in the sewage from being caught and preventing the function of the opening and closing plate 3 from being lost is provided.

At this time, the support frame 11 is also a structure in which the long groove (H) for varying the position of the bearing bracket (BB) so that the rotating shaft (2) is variable.

On the other hand, the opening stopper 5 of the second embodiment is disposed across the lower side of the other opening and closing plate 3 in the transverse direction so as to simultaneously control the opening angle of each opening and closing plate 3, the height adjusting means (6) The structure of elevating by

In addition, while the present invention has been described with reference to the accompanying drawings, preferred embodiments will be apparent to those skilled in the art that various obvious modifications are possible without departing from the scope of the present invention. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

1 is a block diagram showing a state in which rain and earth inflow prevention device having a buoyancy chamber according to the first embodiment of the present invention is installed,

FIG. 2 is an enlarged view of rain and earth inflow prevention apparatus having the buoyancy chamber extracted in FIG.

3 is a perspective view illustrating a state in which the opening and closing plate is separated from FIG. 2;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a perspective view showing a state in which the opening and closing plate is separated from the perspective view of the rainwater and earth and sand inflow prevention device having a buoyancy chamber according to a second embodiment of the present invention,

Figure 6 is a cross-sectional configuration of the conventional "soil inflow prevention device using buoyancy".

Figure 7 is a cross-sectional view of the conventional "soil inflow prevention device of the collecting pipe"

Figure 8 is a cross-sectional configuration of the conventional "soil inflow prevention device having a height adjustment means".

<Description of the symbols for the main parts of the drawings>

1: frame 11: support frame 12: sub support frame

13: Support Bracket

2: axis of rotation

3: opening and closing plate 3a: top plate 3b: bottom plate 3c: partition plate

3d: side panel 3e: buoyancy chamber 3f: buoyancy bucket

31: front weight 32: rear weight 311: spiral weight

312: nuts

4: leveling stopper 41: recessed groove

5: open stopper

6: height adjusting means 61: ball screw 62: lifting nut

7: sewer 71: stormwater 711: sewer inlet 72: connector

73: tea house

H: Long groove BB: Bearing bracket

Claims (8)

A frame (1) seated in at least one sewage inlet hole (711) formed in the rainwater soil chamber (71) provided on the discharge side of the sewer (7); and along the transverse direction of the sewage inlet hole (711) A rotating shaft (2) coupled across the inside of the frame (1); and an opening and closing plate (3) arranged on the rotating shaft (2) to open and close the sewage inlet hole (711) according to the amount of sewage; and the frame Excellent composed of a horizontal holding stopper (4) coupled to the other side of (1) to control the closed state of the opening and closing plate (3), and an opening stopper (5) for controlling the opening angle of the opening and closing plate (3). And in the soil inflow prevention device, The open stopper 5 is disposed transversely across the other lower portion of the opening and closing plate 3, and is elevated by the height adjusting means 6 coupled to both upper surfaces of the frame 1 to open and close the opening plate (3). Is configured to control the opening angle of The opening and closing plate 3 is a buoyancy chamber (3e) is formed therein, The opening and closing plate 3 prevents sag and prevents rainwater and sediment inflow having a buoyancy chamber further comprising a plurality of partition plates 3c therein so that a plurality of buoyancy chambers 3e can be formed. Device. A frame (1) seated in at least one sewage inlet hole (711) formed in the rainwater soil chamber (71) provided on the discharge side of the sewer (7); and along the transverse direction of the sewage inlet hole (711) A rotating shaft (2) coupled across the inside of the frame (1); and an opening and closing plate (3) arranged on the rotating shaft (2) to open and close the sewage inlet hole (711) according to the amount of sewage; and the frame Excellent composed of a horizontal holding stopper (4) coupled to the other side of (1) to control the closed state of the opening and closing plate (3), and an opening stopper (5) for controlling the opening angle of the opening and closing plate (3). And in the soil inflow prevention device, The frame 1 is coupled to a single rotating shaft (2) is accompanied with a plurality of opening and closing plate (3) for opening and closing the sewage inlet hole 711 according to the amount of sewage,  In the inner center of the frame (1) is provided with a support frame (11) connected in the longitudinal direction to partition each opening and closing plate (3), to prevent sagging of the rotating shaft (2), The open stopper 5 is disposed transversely across the other lower portion of the opening and closing plate 3, and is elevated by the height adjusting means 6 coupled to both upper surfaces of the frame 1 to open and close the opening plate (3). Is configured to intercept the opening angle of, The opening and closing plate 3 is a buoyancy chamber (3e) is formed therein, The opening and closing plate 3 prevents sag and prevents rainwater and sediment inflow having a buoyancy chamber further comprising a plurality of partition plates 3c therein so that a plurality of buoyancy chambers 3e can be formed. Device. delete The method according to claim 1 or 2, The opening and closing plate (3) rain and earth inflow prevention device having a buoyancy chamber, characterized in that consisting of a plastic resin material. The method according to claim 1 or 2, The height adjusting means (6) is freely rotatable on the bottom surface of the open stopper (5) so as to lift the open stopper (5) and the ball screw (61) inserted in a vertical downward direction on both sides of the frame (1) Rain and earth inflow prevention device having a buoyancy chamber, characterized in that consisting of the lifting elevating nut (62) attached. 3. The method of claim 2, A bearing bracket BB supporting the rotary shaft 2 is downwardly coupled to the bottom of the support frame 11 to prevent sagging of the rotary shaft 2, The support frame 11 is rain and earth inflow prevention device having a buoyancy chamber characterized in that the long groove (H) is formed to vary the position of the bearing bracket (BB). The method according to claim 1 or 2, The rotating shaft 2 is coupled to both inner sides of the frame 1 through a bearing bracket (BB) to be rotatable, The frame 1 further comprises a buoyancy chamber having a buoyancy chamber, characterized in that it further comprises a support bracket 13 formed with a long groove H for adjusting the position of the bearing bracket BB such that the position of the rotating shaft 2 is variable. Earth and sand intrusion prevention device. The method according to claim 1 or 2, The frame 1 is further provided with a sub support frame 12 coupled in a cantilever shape along the longitudinal direction inside one side to be located in the central portion of the opening and closing plate 3, The sub support frame 12 is a bearing bracket (BB) is fixed to the upper surface, rain and earth inflow having a buoyancy chamber characterized in that the long groove (H) is formed for changing the position of the bearing bracket (BB) Prevention device.

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