Water column closure flat gate and method for determining its dimensions

Abstract

A water column closed plane gate and its size determination method, the water column closed plane gate is regarded as two parts of upper gate and lower gate, the upper gate and the lower gate are welded into one body through connecting plate, the face plate and water seal of the upper gate are arranged on the downstream side, the face plate of the lower gate is arranged on the upstream side, the top part is welded into one body with the face plate of the lower gate and the two side columns through the closed cover plate, the bottom part is provided with corresponding slot type water seal device, the water column force acting on the top part of the lower gate in the critical balance state of the movable water closing of the plane gate is obtained through the force balance rule, and the water column closed safety margin is considered, the height h 下 of the lower gate is obtained s (B L H L +B zs S‑B L δ)+n G G‑hB zs S‑n T (T zd +T zs )] / B L H L ‑△h, after the relevant parameter data is substituted, the height h 下 of the lower gate can be rapidly determined 上 =h‑h 下 , after the main sizes B L , B zs , H L , h 上 , h 下 , etc. are determined, the specific structure detail design of the upper gate and the lower gate can be rapidly carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal structure of water conservancy and hydropower engineering, and particularly relates to a water column closed door plane gate and a size determination method thereof. BACKGROUND

[0002] The plane gate is a commonly used gate type in the water conservancy and hydropower engineering, and when the plane gate is used as an accident gate at the water inlet of a unit, the counterweight water closing door is less used for saving investment, and the water column water closing door is usually used. For the water column closed door plane gate, there are mainly two types of top main beam water column and bottom main beam water column, the top main beam water column is suitable for high water head plane gate, and the bottom main beam water column is suitable for medium and small water head plane gate. The reason is that the high water head plane gate uses high water head and large water column force, so that the top main beam water column is used to reduce the water column pressure and the capacity of the hoist machine. The medium and small water head plane gate uses low water head and small water column force, so that the bottom main beam water column is used to increase the water column force and ensure that the gate can effectively close the door.

[0003] At present, the designers mainly determine the water column force of the plane gate by using a trial calculation method according to engineering experience, that is, the water column pressure is determined according to the gate main beam height, water seal span and water column utilization water head, and then the gate closing force is checked according to the 9.1.1 formula of 9.1 hoist force calculation in the Code for Design of Steel Gate for Hydraulic Power Engineering (NB35055). If the experience is insufficient, there are usually problems of insufficient water column force or excessive water column force, and multiple main beam height adjustments need to be repeatedly performed to achieve reasonable technical and economic requirements. For example, the top main beam is usually used for the high water head high and narrow plane accident gate, and the water column force is insufficient, and the bottom main beam water column is used, which leads to excessive water column force and large capacity of the hoist machine, and increases the investment. Therefore, the trial calculation method requires the designers to have certain engineering experience, and it is not easy to determine the high and narrow plane gate with top main beam water column and bottom main beam water column, and sometimes multiple scheme demonstrations are also needed to determine the size, which is time-consuming and complicated in design. Therefore, the prior art is not perfect and needs to be further improved. SUMMARY

[0004] The main purpose of the present application is to provide a water column closed door plane gate and a size determination method thereof, which aims to solve the above technical problems.

[0005] To achieve the above purpose, on the one hand, the present application provides a water column closed door plane gate, which comprises an upper gate and a lower gate, the upper gate and the lower gate are welded into one body through a connecting plate; an upper gate panel is arranged on the downstream side of the upper gate, and a lower gate panel is arranged on the upstream side of the lower gate; a side water seal and a main support are arranged on both sides of the downstream side of the water column closed door plane gate; a plurality of main beams are arranged in the upper gate and the lower gate respectively; a top water seal is arranged on the top of the downstream side of the upper gate, and a bottom water seal is arranged on the bottom of the lower gate.

[0006] Preferably, the top of the lower gate is provided with a closing cover plate, which is welded integrally with the lower gate panel and the side columns on both sides of the lower gate.

[0007] Preferably, a plurality of T-shaped beams are arranged at the bottom of the closing cover plate, and a flange plate is arranged at the rear of the closing cover plate.

[0008] Preferably, a groove-shaped water seal device is arranged in the groove at the bottom of the side column on both sides of the lower gate.

[0009] In another aspect, the present application also provides a size determination method for the water column closing door flat gate, comprising the following steps:

[0010] Step S1: according to the known gate opening size width B and height H, the designed water head height H s , the height h of the center of the top water seal to the bottom sill, the center distance B zs of the side water seal, the span B L between the two side main supports, the height H L of the main beam, the height S of the outer edge of the water seal head of the top water seal and the side water seal to the upper gate panel, the sum δ of the thickness of the lower gate panel and the bottom water seal, the radius r of the water seal head of the top water seal and the side water seal, and the self-weight G of the water column closing door flat gate are determined;

[0011] Step S2: assuming that the height of the lower gate is h 下 , then the height below the top water seal of the upper gate is h 上 =h-h 下 ;

[0012] Step S3: according to the total water pressure P of the water column closing door flat gate, the support friction T zd of the main support is determined;

[0013] Step S4: the water seal friction T zs experienced by the side water seal and the top water seal is determined;

[0014] Step S5: the critical equilibrium height h x of the lower gate of the water column closing door flat gate when the movable water is closed is determined, and the height h 下 of the lower gate is determined according to the critical equilibrium height h x ;

[0015] Step S6: the height h 上 below the top water seal of the upper gate is determined.

[0016] Preferably, in step S1: the height h of the center of the top water seal to the bottom sill = H+(50-300) mm;

[0017] The center distance B ZS=B + (100~600)mm;

[0018] The span B between the two main supports L = B + (300~1200) mm; and B L =B ZS +(200~600)mm;

[0019] The height H of the main beam L = (1 / 12 ~ 1 / 8)B L .

[0020] In step S3:

[0021] The total water pressure of the water column closed plane gate is P = γ(2H) s -h)hB zs / 2;

[0022] Support friction T zd =f zd ×P=γf zd (2H s -h)hB zs / 2;

[0023] In the formula: γ is the specific gravity of water (kN / m³) 3 );

[0024] f zd The bearing friction coefficient is denoted as .

[0025] In step S4:

[0026] The maximum water pressure P of the side water seal zs1 =(H s -h / 2)×h×2r=(2H s -h)hr;

[0027] Maximum water pressure P of top water seal zs2 =2B zs r(H s -h);

[0028] Since there are two side water seals and one top water seal, the water seal friction T zs =f zs ×(2P zs1 +P zs2 )=2f zs r(2H s h+B zs H s -B zs hh 2 );

[0029] In the formula: f zs is the coefficient of friction for water seal sliding.

[0030] In step S5, the water column force W borne by the lower gate is calculated according to the following formula:

[0031] The water column force W borne by the lower gate s = (H s -h x )B L H L +(H s -h)B zs S;

[0032] The uplift force P borne by the lower gate t = H s B L δ,

[0033]

[0034] Taking into account the water column allowance Δh, the height of the lower gate is:

[0035] h 下 = [H s (B L H L +B zs S-B L δ)+n G G-hB zs S-n T (T zd +T zs )] / B L H L -Δh;

[0036] In the formula, F w is the closing force;

[0037] h x is the critical equilibrium height of the movable water closure of the lower gate;

[0038] n T is the friction resistance safety factor, which can be 1.2;

[0039] n G is the gate self-weight correction factor for calculating the closing force, which can be 0.9-1.0.

[0040] In step S6, the height of the upper gate below the water seal on the top of the gate is h 上 :

[0041] h 上 = h-h 下 = h+Δh-[H s (B L H L +B zs S-BL delta)+n G G-hB zs S-n T (T zd +T zs )] / B L H L .

[0042] Due to the adoption of the above technical solutions, the application has the following advantages:

[0043] (1) The technology regards the water column closed door of the plane gate as being composed of two parts of an upper gate and a lower gate, wherein the upper gate is a downstream water stop water column pressure gate structure, the lower gate is a top main beam full water column gate structure, the upper gate and the lower gate are welded into an integral body through a connecting plate, wherein the face plate and the water seal of the upper gate are arranged on the downstream side, the face plate of the lower gate is arranged on the upstream side, the top part is welded into an integral body with the lower gate face plate and the two side columns through a closed cover plate, the bottom part is provided with a corresponding slot type water seal device, the water column force acting on the top part of the lower gate in the critical balance state of the movable water closing of the plane gate is calculated through the law of force balance, and a certain water column closed door safety margin is considered according to the type, scale and importance of the gate, so that the lower gate height calculation formula h 下 =[H s (B L H L +B zs S-B L delta)+n G G-hB zs S-n T (T zd +T zs )] / B L H L -△h is obtained, after the relevant parameter data is substituted, the height h 下 of the lower gate can be quickly determined, and the height h 上 below the top water seal of the upper gate is h 下 . According to the height of the upper gate and the lower gate, the technology quickly determines the main structure size of the water column closed door plane gate, effectively improves the design efficiency, and the determined water column force meets the requirements of the movable water closing of the plane gate, the margin can be artificially controlled, the water column force will not be too large or insufficient, which is beneficial to the selection of a reasonable hoist capacity, and the technical economy is relatively optimal.

[0044] (2) The small beam arranged at the bottom of the closed cover plate has the function of enhancing local stability.

[0045] (3) The water column closed gate planar gate structure provided by the present invention can be installed on site by welding connecting plates. Compared with the traditional butt joint welding, there is no need to open the bevel during manufacturing. During installation, the gap is set at the connection between the upper gate and the lower gate to adjust the manufacturing error. It has the advantages of simple and quick installation process. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0047] Figure 1 A schematic diagram illustrating the usage state of the water column closing planar gate provided by the present invention;

[0048] Figure 2 for Figure 1 Sectional view of section AA;

[0049] Figure 3 This is an upstream view of the water column closing planar gate provided by the present invention;

[0050] Figure 4 This is a downstream view of the water column closing planar gate provided by the present invention;

[0051] Figure 5 This is a bottom view of the water column closing planar gate provided by the present invention;

[0052] Figure 6 for Figure 5 Enlarged view at point D;

[0053] Figure 7 This is a top view of the water column closing planar gate provided by the present invention;

[0054] Figure 8 for Figure 4 A sectional view of section C-C;

[0055] Figure 9 This is a side view of the water column closing planar gate provided by the present invention;

[0056] Figure 10 for Figure 4 Sectional view of section BB;

[0057] Figure 11 for Figure 10 Enlarged view of point A in the middle;

[0058] Figure 12 forFigure 10 Enlarged view at C;

[0059] Figure 13 For Figure 10 Enlarged view at B.

[0060] BRIEF DESCRIPTION OF DRAWINGS 1. Water column closed plane gate; 2. Upper gate; 3. Lower gate; 4. Connecting plate; 5. Top water seal; 6. Bottom sill; 7. Side water seal; 8. Main support; 9. Main beam; 10. Water seal head outer edge; 11. Upper gate panel; 12. Bottom water seal; 13. Closing cover plate; 14. Side column; 15. Groove type water seal device; 16. T-shaped small beam; 17. Flange plate; 18. Lower gate panel. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0062] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0063] In combination with the drawings, in one aspect, the present embodiment proposes a water column closed plane gate 1, which comprises an upper gate 2 and a lower gate 3, wherein the upper gate 2 is a downstream water-stopping water column pressure gate structure, the lower gate 3 is a top main beam full water column gate structure, and the upper gate 2 and the lower gate 3 are welded into one body through a connecting plate 4; an upper gate panel 11 is arranged on the downstream side of the upper gate 2, and a lower gate panel 18 is arranged on the upstream side of the lower gate 3; a side water seal 7 and a main support 8 are respectively arranged on both sides of the downstream side of the water column closed plane gate 1; a plurality of main beams 9 are respectively arranged in the upper gate 2 and the lower gate 3; a top water seal 5 is arranged on the top of the downstream side of the upper gate 2, and a bottom water seal 12 is arranged on the bottom of the lower gate 3.

[0064] In combination with Figure 10 , Figure 11 In the present embodiment, a closing cover plate 13 is arranged on the top of the lower gate 3, and the closing cover plate 13 is welded into one body with the lower gate panel 18 and the side columns 14 on both sides of the lower gate 3. A plurality of T-shaped small beams 16 are arranged on the bottom of the closing cover plate 13, and a flange plate 17 is arranged on the rear of the closing cover plate 13.

[0065] Combination Figure 5 As shown, a groove-shaped water seal device 15 is installed in the groove at the bottom of the side columns 14 on both sides of the lower gate 3.

[0066] On the other hand, this embodiment also provides a method for determining the dimensions of the aforementioned water-coil closed planar gate. By applying the law of force balance, the water column force acting on the top of the lower gate 3 at the critical equilibrium state of the movable water closing of the planar gate 1 is calculated. Furthermore, a certain safety margin for water column closure is considered based on the gate type, scale, and importance, thereby enabling the rapid determination of the heights of the upper gate 2 and the lower gate 3. The water column force at the critical equilibrium state is calculated as follows: According to the law of force balance, the water column pressure W borne by the lower gate 3... s The weight G of the water column closed-plane gate 1 and the bearing friction T of the main support 8. zd The water seal friction T of top water seal 5 and side water seal 7 zs The upward force P borne by the lower gate 3 t When the sums are equal, it represents the critical state for the water column to close the planar gate 1, which can be closed by moving water. At this point, the height of the lower gate 3 is at its maximum, and the water column force it bears is at the minimum value required to close the gate by moving water. Based on the requirement for safe closure of the gate by moving water, a certain water column force margin Δh needs to be considered. The design head H of the gate is determined by the water column head utilized by the lower gate 3. s Subtract the height h of the lower gate 3 下 To increase the water head utilized by the water column in the lower gate 3, the height of the lower gate 3 needs to be reduced to increase the water head utilized by the water column. The method for determining this dimension specifically includes the following steps:

[0067] Step S1: Based on the known gate orifice dimensions (width B and height H) and design head height H... s Determine the height h from the center of the top water seal 5 to the bottom sill 6, and the center distance B between the two side water seals 7. zs The span B between the two main supports 8 L The height H of main beam 9 L Simultaneously, determine the height S from the outer edge 10 of the water seal head of the top water seal 5 and the side water seal 7 to the upper gate panel 11, the sum of the thicknesses δ of the lower gate panel 18 and the bottom water seal 12, the radius r of the water seal head of the top water seal 5 and the side water seal 7, and the self-weight G of the water column closed gate plane gate 1; specifically, the height h from the center of the top water seal 5 to the bottom sill 6 is H + (50~300) mm; the center distance B of the two side water seals 7 is... ZS =B + (100~600)mm; the span B between the two main supports 8 L = B + (300~1200) mm; and B L =B ZS+ (200~600)mm; Height H of main beam 9 L = (1 / 12 ~ 1 / 8)B L .

[0068] Step S2: assuming the height of the lower gate 3 is h 下 , the height of the upper gate 2 below the top water seal 5 is h 上 . 下 .

[0069] Step S3: determining the bearing friction T of the main bearing 8 according to the total water pressure P of the water column closed plane gate 1 zd ; specifically, according to the main formula table D.0.1 No.3 formula of the gate load calculation in Appendix D of the “Code for Design of Steel Gate of Hydraulic Power Engineering” (NB35055), the total water pressure P of the water column closed plane gate 1 is calculated as P = γ (2H s -h) hB zs / 2;

[0070] Therefore, the bearing friction T zd = f zd × P = γf zd (2H s -h) hB zs / 2;

[0071] In the formula: γ is the unit weight of water (kN / m 3 );

[0072] f zd is the bearing friction coefficient.

[0073] Step S4: determining the water seal friction T zs experienced by the side water seal 7 and the top water seal 5;

[0074] The maximum water pressure P zs1 of the side water seal 7 is (H s -h / 2) × h × 2r = (2H s -h) hr;

[0075] The maximum water pressure P zs2 of the top water seal 5 is 2B zs r (H s -h);

[0076] Since there are two side water seals 7 and one top water seal 5, the water seal friction T zs = f zs × (2P zs1 + P zs2 ) = 2f zs r (2H s h + B zs H s -B zs h-h 2 );

[0077] Specifically, the water pressure of the side water seal 7 is considered based on the average water pressure, which is the product of the design water head minus half the height of the side water seal 7 and its maximum contact area. The water pressure at the center of the side water seal 7 is H. s -h / 2, the maximum contact area of ​​the side water seal 7 is considered as the product of the maximum cross-sectional width of the water seal head (2r) and the water seal height h, i.e., 2hr. The maximum water pressure P of the side water seal 7 is... zs1 For (H) s -h / 2)×h×2r=(2H s -h)hr, the water pressure of the top water seal 5 is the design head minus the product of the water pressure of the top water seal 5 and its maximum contact area, and the water pressure at the center of the top water seal 5 is H. s -h, the maximum contact area of ​​the top water seal 5 is calculated based on the maximum cross-sectional width of the water seal head (2r) and the water seal span B. zs Considering the product, i.e., 2B zs Similarly, the maximum water pressure P of the top water seal 5 can be obtained. zs2 For 2B zs r(H s -h), since there are two side water seals 7 and one top water seal 5, the water seal friction T zs =f zs ×(2P zs1 +P zs2 )=2f zs r(2H s h+B zs H s -B zs hh 2 ).

[0078] Step S5: Determine the critical equilibrium height h of the lower gate 3 when the water column closing plane gate 1 is closed by the movable water. x According to the critical equilibrium height h x Determine the height h of the lower gate 3 下 Specifically, the calculation is performed according to the following formula:

[0079] The water column force W borne by the lower gate 3 s =(H s -h x B L H L +(H s -h)B zs S;

[0080] The upward force P borne by the lower gate 3 t =H s B L δ;

[0081] According to formula 9.1.1 for calculating the opening and closing force in the "Design Code for Steel Gates of Hydropower Projects" (NB35055):

[0082]

[0083] Considering the water column allowance △h, the height of the lower gate 3 is:

[0084] h 下 = [H s (B L H L +B zs S-B L δ) + n G G-hB zs S-n T (T zd +T zs )] / B L H L -△h

[0085] F w is the closing force;

[0086] h x is the critical equilibrium height of the lower gate 3 when the movable water of the water column closing plane gate 1 closes;

[0087] n T is the friction resistance safety factor, which can be 1.2;

[0088] n G is the gate self-weight correction factor for calculating the closing force, which can be 0.9-1.0.

[0089] Step S6: determining the height below the top water seal of the upper gate 2 as h 上 ; specifically, the height below the top water seal of the upper gate 2 is h 上 : h 上 = h-h 下 = h+△h-[H s (B L H L +B zs S-B L δ) + n G G-hB zs S-n T (T zd +T zs )] / B L H L .

[0090] Through the height calculation formula of the lower gate 3 h 下 = [H s (B L H L +B zs S-B L δ) + nG G-hB zs S-n T (T zd +T zs )] / B L H L -△h, after substituting the relevant parameter data, the height h of the lower gate 3 can be quickly determined 下 , so that the height below the upper gate 2 top water seal 5 can be determined as h 上 =h-h 下 According to the height of the upper gate 2 and the lower gate 3, the main structural size of the water column closed door plane gate 1 is quickly determined, the design efficiency is effectively improved, and under the premise of meeting the requirements of the water closed door plane gate 1, the water column force is artificially controlled, which will not lead to excessive and insufficient water column force, which is beneficial to select a reasonable hoist capacity, and the technical economy is better; in addition, the water column closed door plane gate 1 structure provided by the present application is adopted, the connecting plate is welded for on-site installation of the gate, compared with the traditional butt joint welding, no groove needs to be opened during manufacturing, and the gap is arranged at the connection between the upper gate and the lower gate during installation, so that the manufacturing error can be adjusted, and the installation process is simple and fast.

[0091] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the present application, and the contents of the present application are included in the patent protection range of the present application.

Claims

1. A method for determining the dimensions of a water-jet closed planar gate, characterized in that, The water column closed-gate plane gate (1) includes an upper gate (2) and a lower gate (3), which are welded together by a connecting plate (4); an upper gate panel (11) is provided on the downstream side of the upper gate (2), and a lower gate panel (18) is provided on the upstream side of the lower gate (3); a side water seal (7) and a main support (8) are respectively provided on both sides of the downstream side of the water column closed-gate plane gate (1); multiple main beams (9) are respectively provided inside the upper gate (2) and the lower gate (3); a top water seal (5) is provided at the top of the downstream side of the upper gate (2), and a bottom water seal (12) is provided at the bottom of the lower gate (3). The method for determining dimensions includes the following steps: Step S1: Based on the known gate orifice dimensions (width B and height H) and design head height H... s Determine the height h from the center of the top water seal (5) to the bottom sill (6) and the center distance B between the two side water seals (7). zs The span B between the two main supports (8) L The height H of the main beam (9) L Meanwhile, the height S from the outer edge (10) of the water seal head of the top water seal (5) and the side water seal (7) to the upper gate panel (11), the sum of the thicknesses of the lower gate panel (18) and the bottom water seal (12), the radius r of the water seal head of the top water seal (5) and the side water seal (7), and the self-weight G of the water column closed gate plane gate (1) are determined. Step S2: Assume the height of the lower gate (3) is h. 下 Then the height below the top water seal (5) of the upper gate (2) is h. 上 =hh 下 ; Step S3: Determine the bearing friction T of the main support (8) based on the total water pressure P of the water column closed plane gate (1). zd ; Step S4: Determine the water seal friction resistance T on the side water seal (7) and top water seal (5). zs ; Step S5: Determine the critical equilibrium height h for the active water closure of the lower gate (3). x According to the critical equilibrium height h x Determine the height h of the lower gate (3) 下 ; Step S6: Determine the height h below the top water seal of the upper gate (2). 上 .

2. The method for determining the dimensions of a water column closed planar gate as described in claim 1, characterized in that, The top of the lower gate (3) is provided with a closed cover plate (13), which is welded together with the lower gate panel (18) and the side posts (14) on both sides of the lower gate (3).

3. The method for determining the dimensions of a water column closed planar gate as described in claim 2, characterized in that, Multiple T-shaped beams (16) are provided at the bottom of the closed cover plate (13), and a flange plate (17) is provided at the rear of the closed cover plate (13).

4. The method for determining the dimensions of a water column closed planar gate as described in claim 1, characterized in that, A trough-shaped water seal device (15) is installed in the groove at the bottom of the side column (14) on both sides of the lower gate (3).

5. The method for determining the dimensions of a water column closed planar gate as described in claim 1, characterized in that, In step S1: The height h from the center of the top water seal (5) to the bottom sill (6) is H + (50~300) mm; The center distance B between the two side water seals (7) ZS =B + (100~600)mm; The span B between the two main supports (8) L =B + (300~1200) mm, and B L =B ZS + (200~600) mm; The height H of the main beam (9) L = (1 / 12~1 / 8)B L .

6. The method for determining the dimensions of a water column closed planar gate as described in claim 5, characterized in that, In step S3: The total water pressure P of the water column closed plane gate (1) is P = γ(2H) s -h)hB zs / 2; Support friction T zd =f zd ×P=γf zd (2H) s -h)hB zs / 2; In the formula: γ is the specific gravity of water (kN / m³) 3 ); f zd The bearing friction coefficient is denoted as .

7. The method for determining the dimensions of a water column closed planar gate as described in claim 6, characterized in that, In step S4: The maximum water pressure P of the side water seal (7) zs1 =(H s -h / 2)×h×2r=(2H s -h)hr; Top water seal (5) Maximum water pressure P zs2 =2B zs r(H s -h); Since there are two side water seals (7) and one top water seal (5), the water seal friction T zs = f zs ×(2P zs1 + P zs2 )=2f zs r(2H) s h+B zs H s - B zs hh 2 ); In the formula: f zs is the coefficient of sliding friction of the water seal.

8. The method for determining the dimensions of a water column closed planar gate as described in claim 7, characterized in that, In step S5, according to the following formula: The water column force W borne by the lower gate (3) s =(H s -h x B L H L +(H s -h)B zs S; The upward force P borne by the lower gate (3) t = H s B L δ, F w =n T (T zd +T zs )+P t -n G G-Ws<0⇒h x =[H s (B L H L +B zs S-B L δ)+ n G G -hB zs S-n T (T zd +T zs )] / B L H L , Considering the water column margin Δh, the height of the lower gate (3) is obtained as follows: h 下 =[H s (B L H L +B zs S-B L δ)+ n G G -hB zs S-n T (T zd +T zs )] / B L H L -△h; In the formula: F w For closing force; h x For a water column closed planar gate (1), the lower gate when the movable water is closed (3), the critical balance height; n T A safety factor of 1.2 can be used to determine the frictional resistance. n G The gate's self-weight correction factor used to calculate the closing force can be 0.9 to 1.

0.

9. The method for determining the dimensions of a water column closed planar gate as described in claim 8, characterized in that, In step S6, the height below the top water seal of the upper gate (2) is h. 上 for: h 上 =h-h 下 = h +△h-[H s (B L H L + B zs S-B L δ)+ n G G - hB zs S- n T (T zd +T zs )] / B L H L 。

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