KR790001180B1 - Flap gate - Google Patents

Abstract

A flap gate structure for closing the partially submerzed entrance opening of a dock or the like consisted of a rectangular vertical transverse crosssection, a pair of fixed pins and supported pieces mounted on the water gate door body and was free from leakage, stable in dynamic aspects when the water gate door body was erected against the respective pins on their side toward the bank wall.

Description

Flap gate

1 to 6 are flap gates installed in a dock of the conventional type,

1 is a front view of the sea side.

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

3 is an enlarged view of the vicinity of the bottom wooden seat of FIG.

4 is an enlarged view of the rotary support of FIG.

FIG. 5 is an explanatory diagram of displacement caused by the hydraulic load of the central portion of FIG. 1; FIG.

6 is an explanatory diagram of reaction force at the center of the door.

7, 8, and 9 show an embodiment of the present invention.

7 is a sea front view of the flap gate provided at the entrance port.

8 is a cross-sectional view taken along the line B-B in FIG.

9 is an enlarged detail view of the vicinity of the rotary support of FIG.

FIG. 10 and FIG. 11 are comparative explanatory views of a ballast detection amount of a conventional flap gate and a flap gate according to the present invention.

The present invention relates to an improvement of a flap gate.

Conventionally, the flap gate of the type in which the front end of the door contacts the frozen wall and receives water pressure to block the water, and the rotary support is provided on the lower surface of the door is relatively small between the support diameters. Although has been used without any problems, there are various obstacles to remarkably increasing the distance between the support mirror to be constructed in recent years.

Referring to the conventional dock flap gate according to Figs. 1 to 6, (01) is the main beam, (02) is the vertical beam, and (03). Is a rotating support installed on the lower left and right sides of the door, (04) is the side seat, (05) is the bottom seat, (06) is the wall, and (07) is the bottom ) And (08) are water-barrier rubbers fixed to the bottom seat (05).

The rotary support 03 is a support base (011) fixed to the lateral outer seabed (渠 低 外側 海底), the support shaft 09 fixed to the support base (011) horizontally, and vertical ratio ( 02 is a support (010) with a bend attached to the lower portion, and the door is supported by the support shaft (09) is supported by the bent portion of the support (010), the relief operation (起伏 操作) becomes.

The length d of the sphere in which the support 010 is placed on the support shaft 09 is sufficiently large compared to the diameter of the support shaft 09, and only the weight of the door is supported at the time of the vertical tilt of the door. It is transmitted to the shaft 09, and the support shaft 09 is not restrained at all by the support tool 010.

Referring to the conventional load transfer mechanism of the flap gate, in Fig. 2, the load on the sea side is transmitted to the longitudinal beam 02 through the door plate, and the longitudinal beam 02 is the main beam. It is supported by the base 07 through the (01) and the bottom seat (05).

The main beam 01 is supported by the base wall 06 via the side seat 04.

The main beam 01 mainly acts as a bending member and a box shape is used to reduce the influence of waves in the cross-sectional shape.

It is necessary for the width a 'of the box to be about 1/10 of the support span b' for strength, and the height h 'of the box is determined so that the bottom of the box is sufficiently lower than the lowest roughness.

The flap gate of the conventional type is used without problems until about 50m, but as the demand tendency of the dock which is recently dried, the height of the flap gate is remarkably large without the bogie, and the width of the flap gate is about 100m. Has been increased.

Therefore, the following types of obstacles and drawbacks occur in the conventional type. In other words,

(I). The lower end of the span terminal tends to fall off the wall, causing water leakage in this area.

Referring to the fifth road, when water pressure is applied to the door, the door center portion is displaced as indicated by the dotted line 013 at the normal position indicated by the solid line 012.

(014) indicates the rotation angle θ.

Since the main beam 01 has a large resistance to torsion in the box cross section, the left and right ends of the gate in FIG. 1 tend to be attracted to the rotation θ to rotate.

This tendency becomes large in proportion to the approximate square power of the supporting end b ', so that when the supporting span becomes more than a certain value, the moment to stop the rotation of the end becomes weak, Rotates with the top P (see FIG. 2) as the point.

In other words, the watertight is not maintained because a jump is generated at the end in contact with the end face of the base 07.

(II). This results in an increase in the bending moment near the center of the support span b '.

This is in relation to the leap at the bottom of the door.

Referring to FIG. 6, FIG. 6 shows the reaction force at the center of the door, R denotes the reaction force at the bottom 07, and L is the main ratio of the aspect ratio 02. The distance from the side support edge to the reaction force R is indicated.

Here, the bending moment on the main beam (01) side of the longitudinal beam (02) is R × L, but the rebound force of the terminal part of the preceding paragraph is zero, so the reaction force near the center is as much as its share. This tends to increase, so the bending moment increases.

If the support span b 'is blown, this tendency becomes strong, and it is difficult to press the stress within the allowable value unless the cross section of the longitudinal beam is made large enough.

However, if the cross section of the longitudinal beam is enlarged, the problem of stress is solved, but the weight of the entire hydrological door is increased, and thus a large production cost cannot be avoided.

(III). The amount of seabed excavation on the sea side at which the flap gate conducts is increased.

The box width a 'becomes significantly larger and the necessity to excavate the seabed deeply in order to knock over the door completely, which leads to an increase in the construction cost of the gate.

The present invention is intended to solve the above-mentioned drawback by the flap gate of the conventional type which installs the main beam and the longitudinal beam below, and the rotational support which leans the door only rotates and supports the door. It is done.

An embodiment of the present invention will be described with reference to FIGS. 7, 8, 9 and 11. (1) is the door of the closed cross-sectional phenomenon with the door width very small with respect to the supporting span, (2) the sea side, (3) the rotary support installed on the lower surface of both ends of the door length, (4) is the shaft seat installed on both sides of the front door A, (5) the bottom seat seat is installed at the bottom longitudinal direction of the front door A, (6) is the wall and (7) is the bottom ) And (8) are the door rubbers fixed to the bottom seat 5, and 13 are the entrance and exit holes of water provided in the lower part of the door 1.

In the above, the rotary support (3) is a horizontal support shaft (9) for supporting the door (1), a pair of left and right support bases (11) fixed to the outer bottom of the bottom and the door (1) It is a combination with the support tool 10 which has the downward curved part 12 mounted in the lower left and right ends of the ().

The width a of the door 1 is about 1/20 or less of the support span b, and the height h is substantially equal to the height of the dock.

When the door 1 is in a vertical standing state, i.e., when the dock is empty and the sea water is blocked, the bend 12 of the support 10 is supported by the support shaft 9 on its right side in FIG. ), The support shaft 9 receives a reaction force f, and the support shaft 9 and the support 10 restrain each other so that the door 1 does not move away from the bottom 7.

In the above description, the operation is explained. When the pressure is applied to the door 1 while the door 1 blocks the inlet of the dock, most of the hydraulic load is applied to the bottom seat 5 through the door 1. Receive.

Therefore, the falling moment occurs in the door 1, which is transmitted to both terminals by the torsional shear of the cross section of the door, and the supporting reaction force acting on the side seat 4 and the support base 11 Balanced by

In other words, the reaction force of f is received by the support shaft 9 and thus there is no gap in the lower portion of the door terminal.

Therefore, f = 2,000f becomes b = 100m, a = 5m h = 12m, and f = 1,400f when b = 80m, a = 5m, and h = 12.85m.

In other words, since the cross-sectional area of the door 1 is very large, the torsional rigidity is very large, and since the cross-sectional width a is small, the bending rigidity is very small. Rotation of the door terminal by the trickling is completely restrained by the support shaft 9.

The width of the door to be about 1/20 or less of the support span b is determined by calculation and experiment.

In short, when a is made small, since the bending rigidity 1E of the door is proportional to the square of a, the bending moment is reduced.

Since the return stiffness 1E is proportional to the square of a × h, the return stiffness JE can be increased even if a is reduced by increasing h as compared with a.

From this point of view, by setting h to approximately 2a or more, the bearing capacity is mainly borne by the return rigid parts, and the door can be designed mainly by the return phenomenon.

As described above, in the present invention, the width of the door is almost 1/20 or less of the support span, and the closed cross-sectional structure is used, and as the rotary support for supporting the door, the door terminal is lowered from the wall. Since the restraint can be prevented, the following effects are expected.

One). Since the width of the door is approximately 1/20 or less between the support spans, the bending rigidity in the horizontal plane is reduced, and therefore the bending stress is reduced. This is because the door is supported on two sides, so the strength is statically unstable, and a large rigid return part bears a large strength.

2). The lower part of the leaf terminal does not leap as in the prior art, and therefore, no leakage occurs.

3). Since there is no conventional longitudinal beam portion, there is no problem of bending moment, and the width of the door is smaller than that of the prior art, so that the amount of excavation of the seabed is minimal.

4). Since the torsional rigidity is extremely large compared to the bending rigidity, the thickness of the plate is determined by the torsional mould, and the plate thickness is about 1/3 compared to that determined by the bending moment, which makes welding work simple and torsional. The production cost is reduced due to improvement of workability and reduction of door weight.

Therefore, for example, the weight comparison between the flap gate of FIG. 2 and the flap gate of the present invention in which the support span b, b 'and the hydrological effective height H are the same is shown in the following table. Although a / b is actually 1/16, the present invention shows an excellent effect, and h / a is advantageous even if it is 1.8.

5). According to the conventional type in FIG. 10 and the present invention in FIG. 11, buoys 14 and 14 'are provided for reducing the lifting load of the door and for maintenance work. The ballasts 15 and 15 'are provided in order to make the curve close to the buoyancy center of the buoy. However, according to the present invention, since the center of the door is closer to the buoy center than the conventional one, the amount of ballast is very high. You can do less.

Claims (1)

In a substantially rectangular cross-sectional closed-gate gate, in which longitudinal lower edges are detachable and retractably supported on rotating supports, the cross-sectional width a is not more than 1/20 of the support span b; At the same time, the flap gate, characterized in that the contact surface along the lower end of the vertical standing of the door abuts on the frozen wall and is constrained by the rotating support so as not to fall off the frozen wall.

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