Self-floating twin pontoon sleeve gate apparatus and method of use thereof

Abstract

A self-floating double-hull sleeve gate device and a method for using the same, the device comprising trash rack device, stoplog gate device, emergency gate device, arc-shaped working gate device and sleeve gate, the sleeve gate comprising two floating hulls, a top sleeve, multiple middle sleeves and a bottom sleeve, the trash rack device and the stoplog gate device being sequentially arranged in a cavity between a water inlet and a breast wall, a circular hole being formed in a bottom plate of the cavity, the bottom sleeve of the sleeve gate being installed above the circular hole, a water outlet channel starting from the circular hole sequentially arranging the emergency gate device and the arc-shaped working gate device; the top sleeve, the multiple middle sleeves and the bottom sleeve all being double-layer structures and being sequentially connected from top to bottom; the two floating hulls being symmetrically arranged along a center line of the sleeve, the floating hulls being closed cylindrical shapes with their axis lines being parallel to a water flow direction, and the floating hulls being connected with the top sleeve. The present application can realize taking surface water, ensuring water flow and adapting to large-amplitude water level changes through the design of double floating hulls and double-layer sleeves.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water conservancy and hydropower engineering, in particular to a self-floating double-float-sleeve gate device and a use method thereof, which is particularly suitable for layered water intake of water intake structure of water conservancy and hydropower engineering. BACKGROUND

[0002] The layered water intake type mainly includes multi-layer type, stoplog gate type, flap gate type, sleeve type and inclined type. The sleeve gate layered water intake in the early stage adopts machine control. The machine control sleeve layered water intake device uses mechanical equipment to hang the top cylinder and the water intake. The pipe body is composed of cylinders with different diameters. The cylinder is extended or retracted by pulling or lowering the lifting cable to achieve the purpose of taking surface water. On this basis, the self-floating sleeve water intake is developed. The self-floating sleeve gate is mainly composed of an upper float and a sleeve. The sleeve is generally large at the top and small at the bottom. The upper sleeve can be nested outside the lower sleeve under the action of gravity. The float is arranged directly above the sleeve. The float and the sleeve have a reserved gap, and the two are connected by a connecting plate. The working principle of water intake is as follows: the lower sleeves are pulled up by the buoyancy of the upper float. The float has a certain draft depth. There is a certain distance between the top of the top sleeve and the water surface, so that the reservoir water can enter the top water intake of the sleeve through the gap between the float and the sleeve, and flow down along the sleeve, and then flow downstream through the flow channel in the water intake tower. When the reservoir water level is at the normal storage level, all the sleeves are pulled up, the float bears the weight of all the sleeves, and the float has the deepest draft. When the reservoir water level is at the dead water level, all the sleeves fall down, and the float has the shallowest draft.

[0003] In the practical application of the self-floating sleeve gate, the following problems exist: 1) the water intake area between the float and the top sleeve is small, the water intake flow is not enough, the deep water is pulled into the sleeve, and the water temperature and flow pattern of water intake are affected; 2) the water intake depth is large, it is not easy to take the surface water, and the water temperature of water intake cannot be guaranteed; 3) it is not suitable for large water level variation, and the sleeve is easy to lose stability under the action of external pressure when the water level variation of the water intake is large. SUMMARY

[0004] The purpose of the present application is to provide a double-float self-floating sleeve gate device and a use method thereof to solve the above technical problems.

[0005] The present application adopts the following technical solutions to solve the above technical problems:

[0006] The self-floating double-float sleeve gate device comprises a trash rack device, a stoplog gate device, an emergency gate device, an arc-shaped working gate device and a sleeve gate. The sleeve gate comprises two floats, a top sleeve, a plurality of middle sleeves and a bottom sleeve. The trash rack device and the stoplog gate device are sequentially arranged in a cavity between the water inlet and the breast wall. A circular hole is formed in the bottom plate of the cavity. The bottom sleeve of the sleeve gate is installed above the circular hole. The water outlet channel starting from the circular hole is sequentially provided with the emergency gate device and the arc-shaped working gate device. The top sleeve, the plurality of middle sleeves and the bottom sleeve are double-layer structures and are sequentially connected from top to bottom. The two floats are symmetrically arranged along the center line of the sleeve. The float is a closed cylinder with the axis parallel to the water flow direction. The float is connected with the top sleeve. The sleeve gate is suspended above the cavity under the action of the water body in the reservoir. The surface water body enters the sleeve through the space between the two floats, and the side water body enters the sleeve through the space between the float and the top sleeve to form the water body in the channel.

[0007] Further, the trash rack device comprises a trash rack slot and a trash rack installed in the trash rack slot. The stoplog gate device comprises a stoplog gate slot, a stoplog gate and a stoplog gate storage. The stoplog gate is placed in the stoplog gate storage during normal water intake. The stoplog gate is hoisted into the stoplog gate slot from the stoplog gate storage by the dam top bridge machine during maintenance. The emergency gate device comprises an emergency gate slot and an emergency gate installed in the emergency gate slot. The arc-shaped working gate device comprises an arc-shaped working gate slot and an arc-shaped working gate installed in the arc-shaped working gate slot.

[0008] Further, the top sleeve, the middle sleeve and the bottom sleeve have the same structure, which comprises a sleeve inner wall, a sleeve outer wall arranged outside the sleeve inner wall, a sleeve stiffening ring connecting the sleeve inner wall and the sleeve outer wall, a top end limiting plate installed on the top end of the sleeve stiffening ring (the top sleeve has no top end limiting plate), a bottom end support, a bottom end limiting plate and a support block installed on the bottom end support, and a sealing sliding block installed on the bottom end limiting plate (the bottom sleeve has no bottom end limiting plate and sealing sliding block). The support block is used to support the upper sleeve. The sealing sliding block of the upper sleeve slides on the outer wall of the lower sleeve, so as to ensure that the sleeves can slide up and down and have a certain sealing property.

[0009] Further, the sleeve stiffening ring is sequentially provided with a top end stiffening ring, a middle stiffening ring and a bottom end stiffening ring from top to bottom, which are respectively connected to the upper part, the middle part and the bottom part between the sleeve inner wall and the sleeve outer wall. The top end limiting plate is welded to the outside of the top end stiffening ring. The bottom end support is welded to the outside of the bottom end stiffening ring. The support block is welded on the bottom end support. Bolt holes are formed in the bottom end support for fixing the bottom end limiting plate. Bolt holes are formed in the bottom end limiting plate for fixing the sealing sliding block. After the sleeve gate is installed, the bottom end limiting plate is fixed on the bottom end support by fasteners, and the sealing sliding block is fixed on the bottom end limiting plate by the pressing plate and the bolt.

[0010] Further, during operation, the sleeve is stretched and contracted in the vertical direction, and the top end limiting plate and the bottom end limiting plate of the lower sleeve prevent the upper sleeve and the lower sleeve from being separated, the upper limit of the upper sleeve is that the upper surface of the pressing plate contacts the lower surface of the top end limiting plate of the lower sleeve, and the lower limit of the upper sleeve is that the bottom end limiting plate falls on the supporting block of the lower sleeve.

[0011] Further, the two floating boxes are connected by a connecting beam.

[0012] Further, a water filling and draining hole is arranged at the upper part of the floating box for water filling and draining of the floating box.

[0013] Further, the floating box and the top sleeve are connected by a connecting plate.

[0014] A use method of the self-floating double-floating-box sleeve gate device, comprising:

[0015] The sleeve of the sleeve gate is installed as follows: the bottom sleeve is installed first by using the tower top bridge machine, the water stop rubber is arranged at the bottom end of the sleeve and connected with the bottom plate by an anchor rod, after the bottom sleeve is completely positioned, the middle sleeve is sleeved into the bottom sleeve by the tower top bridge machine, the bottom end limiting plate and the sealing sliding block of the middle sleeve are installed, and the above steps are repeated until all the sleeves are installed;

[0016] The floating box of the sleeve gate is installed as follows: after the installation of the sleeve is completed, the floating box is hoisted in and connected with the top sleeve by a connecting plate, the installation is completed, and the two floating boxes are symmetrically arranged along the center line of the sleeve.

[0017] Normal water taking: the trash rack is placed in the trash rack slot to intercept pollutants at the water inlet, the stoplog gate is placed in the stoplog gate storehouse, the reservoir water body enters the cavity, the sleeve gate is suspended above the cavity under the action of the reservoir water body, the surface water body enters the sleeve through the space between the two floating boxes and the space between the floating box and the sleeve top to form a flow channel water body, the floating box rises or falls with the change of the reservoir water body to realize stepless layered water taking, and the accident gate is locked above the orifice by a hoisting rod and the flow channel water body is controlled by the arc working door with different opening degrees.

[0018] Further, the sleeve gate is maintained as follows: first, the arc working door is closed in the flowing water state, then the stoplog gate is hoisted into the stoplog gate slot from the stoplog gate storehouse by the aid of the dam top bridge machine, the water body between the stoplog gate and the arc working door is discharged by a water pump, as the water body descends, the floating box and the sleeve descend, the water body in the sleeve is also discharged, finally, the sleeve gate and the flow channel are maintained, during the maintenance, the upstream stoplog gate and the downstream arc working door block water, the floating box and the sleeve are removed by the bridge machine, the reverse operation of the installation mode is performed, after the maintenance is completed, the water pressure is filled, the floating box slowly floats up, the stoplog gate is hoisted into the stoplog gate storehouse by the tower top gate machine, the arc working door is opened, and normal water taking is realized.

[0019] Compared with the conventional self-floating sleeve gate device, the structure of the present application has the following advantages:

[0020] (1) The double floating boxes are parallel to the water flow direction, and the surface water including the surface water body enters the sleeve gate through the space between the two floating boxes, so that the surface water body is taken, which is beneficial to ensure the water temperature of the taken water;

[0021] (2) The double floating boxes are adopted, and the surface water body enters the sleeve gate through the space between the two floating boxes, which is a new water inlet channel, and the side water body enters the sleeve gate through the space between the floating box and the top sleeve, so that the water inlet area of the top of the sleeve is large, thereby ensuring the water flow and the stable flow state;

[0022] (3) Since the double floating boxes are adopted, the draft depth of the floating box is reduced, and the surface water is easily taken;

[0023] (4) The double-layer sleeve is adopted, the sleeve has high stability in resisting external pressure, and is suitable for large-amplitude water level changes;

[0024] (5) The double-layer sleeve is adopted, and the cavity between the inner wall and the outer wall of the sleeve can provide buoyancy, reduce the draft depth of the upper floating box, and easily take the surface water. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the self-floating double floating box sleeve gate device of the embodiment of the present application;

[0026] Figure 2 is Figure 1 the I-I section;

[0027] Figure 3 is Figure 1 the II-II section;

[0028] Figure 4 is Figure 1 the III-III section;

[0029] Figure 5 is the lowest water intake level of the self-floating double floating box sleeve gate of the present application;

[0030] Figure 6 is Figure 3 an enlarged view of part A;

[0031] Figure 7 is Figure 5 an enlarged view of part B;

[0032] Figure 8 is a structural schematic view of the sleeve of the embodiment of the present application;

[0033] Figure 9The sliding diagram of the sleeve of the embodiment of the present application;

[0034] Figure 10 The installation and dismounting diagram of the sleeve of the embodiment of the present application;

[0035] Figure 11 The buckling instability diagram of the single-layer sleeve under external pressure;

[0036] Figure 12 The buckling instability diagram of the double-layer sleeve under external pressure.

[0037] In the figure: 1.1 - trash rack slot, 1.2 - trash rack, 2.1 - stoplog gate slot, 2.2 - stoplog gate, 2.3 - stoplog gate storage, 3.1 - emergency gate slot, 3.2 - emergency gate, 4.1 - arc-shaped working gate slot, 4.2 - arc-shaped working gate, 5 - sleeve gate, 6 - flow passage water body, 7 - reservoir water body, 8 - surface water body, 9 - side water body, 10 - breast wall, 11 - float box, 12 - water filling and draining hole, 13 - connecting beam, 14 - guide device, 15 - connecting plate, 16 - sleeve, 16.1 - top sleeve, 16.2 - middle sleeve, 16.3 - bottom sleeve, 17 - sleeve inner wall, 18 - sleeve outer wall, 19.1 - top stiffening ring, 19.2 - middle stiffening ring, 19.3 - bottom stiffening ring, 20 - cavity, 21 - top limiting plate, 22 - bottom limiting plate, 23 - bottom support, 24 - supporting block, 25 - sealing sliding block, 26 - pressing plate, 27 - fastener, 28 - bolt, 29 - anchor rod. DETAILED DESCRIPTION

[0038] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application.

[0039] Please refer to Figures 1-10 The embodiment of the present application provides a self-floating double-float-box sleeve gate device, which comprises a trash rack device, a stoplog gate device, an emergency gate device, an arc-shaped working gate device and a sleeve gate 5.

[0040] The sleeve gate 5 comprises two float boxes 11, a top sleeve 16.1, multiple middle sleeves 16.2, a bottom sleeve 16.3 and connecting pieces. The trash rack device comprises a trash rack slot 1.1 and a trash rack 1.2 installed in the trash rack slot 1.1. The stoplog gate device comprises a stoplog gate slot 2.1, a stoplog gate 2.2 and a stoplog gate storage 2.3. The emergency gate device comprises an emergency gate slot 3.1 and an emergency gate 3.2 installed in the emergency gate slot 3.1. The arc-shaped working gate device comprises an arc-shaped working gate slot 4.1 and an arc-shaped working gate 4.2 installed in the arc-shaped working gate slot 4.1.

[0041] Please refer toFigure 1 With Figure 2 , the flow passage of the intake tower is divided into two parts. The first part is the cavity between the water inlet and the parapet 10, which sequentially passes through the trash rack slot 1.1, the stoplog gate slot 2.1 from upstream to downstream, and a circular hole is formed on the bottom plate of the cavity. The bottom sleeve 16.3 of the sleeve gate 5 is installed above the circular hole. The second part is the water outlet flow passage, the starting end of which is a circular hole. The outlet of the flow passage is provided with an arc-shaped working door slot 3.1, and an emergency maintenance door slot 4.1 is arranged in front of the arc-shaped working door slot 3.1. A bridge machine is arranged at the top of the tower, a stoplog gate door library 2.3 is arranged behind the parapet 10, and a hydraulic hoist is arranged above the arc-shaped working door 4.5.

[0042] As Figure 8 shown, the sleeve 16 (top sleeve 16.1, middle sleeve 16.2, bottom sleeve 16.3) includes a sleeve inner wall 17, a sleeve outer wall 18, a sleeve stiffening ring, a top limiting plate 21, a bottom limiting plate 22, a bottom support 23, and a support block 24. The sleeve stiffening ring includes a top stiffening ring 19.1, a middle stiffening ring 19.2, and a bottom stiffening ring 19.3. The sleeve outer wall 18, the sleeve inner wall 17, the top stiffening ring 19.1, the middle stiffening ring 19.2, and the bottom stiffening ring 19.3 form a double-layer stress structure, which greatly improves the ability to resist external pressure. The cavity 20 between the sleeve outer wall 18, the sleeve inner wall 17, and the sleeve stiffening ring provides buoyancy, which can reduce the size of the float 11.

[0043] Please refer to Figure 9 , the top limiting plate 21 is welded on the outside of the top stiffening ring 19.1, the bottom support 23 is welded on the outside of the bottom stiffening ring 19.3, the support block 24 is welded on the bottom support 23, which is used to support the upper sleeve, the bottom support 23 is provided with bolt holes for fixing the bottom limiting plate 22, and the bottom limiting plate 22 is provided with bolt holes for fixing the sealing sliding block 25 (as Figure 10 shown). After the sleeve gate 5 is installed, the bottom limiting plate 22 is fixed on the bottom support 23 by the fastener 27, and the sealing sliding block 25 is fixed on the bottom limiting plate 22 by the pressing plate 26 and the bolt 28. The sealing sliding block 25 of the upper sleeve slides on the outer wall of the lower sleeve, thereby ensuring that the sleeves can slide up and down and have a certain sealing property. During operation, the sleeve is stretched (upward) and contracted (downward) in the vertical direction. The top limiting plate 21 and the bottom limiting plate 22 of the lower sleeve prevent the upper sleeve from being separated from the lower sleeve. The upper limit position of the upper sleeve is that the upper surface of the pressing plate 26 contacts the lower surface of the top limiting plate 21 of the lower sleeve (as Figure 6 shown), and the lower limit position of the upper sleeve is that the bottom limiting plate 22 falls on the support block 24 of the lower sleeve (as Figure 7 shown). When the sleeve needs to be disassembled, the fastener 27 and the bolt 28 can be loosened.

[0044] When the sleeve gate 5 is installed, the bottom sleeve 16.3 is installed first by using the tower top bridge machine. The bottom end of the sleeve is provided with a water stop rubber, which is connected with the bottom plate by anchor rod 29. After the bottom sleeve 16.3 is completely in place, the tower top bridge machine will sleeve the middle sleeve 16.2 into the bottom sleeve 16.3, and install the bottom end limiting plate 22 and the sealing sliding block 25 of the middle sleeve 16.2. In this way, all the sleeves are installed. After the sleeves are installed, the floating box 11 is hoisted in and connected with the top sleeve 16.1 by the connecting plate 15 (as shown in Figure 5 ), and the installation is completed. The two floating boxes 11 are symmetrically arranged along the center line of the sleeve (as shown in Figure 4 ). The floating box 11 is a closed cylindrical shape, and the axis is parallel to the flow direction, which facilitates the entry of the surface water body 8 into the sleeve 16 and increases the water passing space. The floating boxes 11 are connected by the connecting beam 13, and the water filling and draining holes 12 are arranged on the upper part of the floating box 11, so that the floating box 11 can be filled with water and drained. During operation, the draft of the floating box 11 is adjusted. In order to ensure the stable operation of the floating box 11, the guide device 14 is arranged between the floating box 11 and the gate wall, and the guide device 14 can also be welded on the stiffening ring 19.3 at the bottom end of the sleeve.

[0045] When normal water is taken, the trash rack 1.2 is placed in the trash rack slot 1.1 to intercept the pollutants at the water inlet. The stoplog gate 2.2 is placed in the stoplog gate storage 2.2. The reservoir water enters the cavity, and the sleeve gate 5 is suspended above the cavity under the action of the reservoir water. The surface water body 8 enters the sleeve through the space between the two floating boxes 11, and the side water body 9 enters the sleeve through the space between the floating box 11 and the sleeve top, forming the flow passage water body 6. The surface water body 8 contains surface water, which is beneficial to ensure the water temperature of the water taken. The sleeve pipe wall separates the reservoir water body 7 from the flow passage water body 6, and the reservoir water body 7 can only enter the sleeve from the top of the sleeve, so as to realize the taking of the surface reservoir water body. The floating box 11 rises or falls with the change of the reservoir water body 7, so as to realize the stepless layered water taking without the need of mechanical equipment to provide mechanical force for lifting or lowering. The accident gate 3.2 is locked above the hole by the lifting rod, and the arc-shaped working gate 4.2 controls the flow of the flow passage water body 6 by different opening degrees.

[0046] When the sleeve gate 5 needs to be overhauled after a period of operation, the main contents of the overhaul are to replace the sealing sliding block 25, check the reliability of the guide device 14, and perform anti-corrosion coating on the rusted parts, etc. First, close the arc-shaped working door 4.2 under the condition of flowing water, then use the dam top bridge machine to hoist the stoplog maintenance door 2.2 from the stoplog maintenance door warehouse 2.3 into the stoplog maintenance door slot 2.1, use the water pump to drain the water between the stoplog maintenance door 2.2 and the arc-shaped working door 4.2, as the water level drops, the floating box 11 and the sleeve also drop, the water in the sleeve is also drained, and finally the sleeve gate 5 and the flow passage are overhauled. During the overhaul, the upstream stoplog maintenance door 2.2 and the downstream arc-shaped working door 4.2 are used to block the water, the floating box 11 and the sleeve are removed by the bridge machine, and the reverse operation of the installation mode is performed. After the overhaul is completed, the horizontal pressure is filled, the floating box 11 slowly floats up, the stoplog maintenance door 4.2 is hoisted into the stoplog maintenance door warehouse 2.3 by the tower top door machine, the arc-shaped working door 4.2 is opened, and the water is normally taken. When the arc-shaped working door 4.2 needs to be overhauled, the emergency maintenance door 3.2 is closed under the condition of flowing water, and after the overhaul is completed, the arc-shaped working door 4.2 is closed. The emergency maintenance door 3.2 uses the flat pressure valve to fill the horizontal pressure, and after the flat pressure, the emergency maintenance door 3.2 is locked above the opening of the emergency maintenance door slot 3.1 by using the intake tower top bridge machine, the arc-shaped working door 4.2 is opened, and the water is normally taken.

[0047] When an abnormal situation occurs, the water level of the reservoir water body 7 drops, but the sleeve is blocked, the floating box 11 cannot drop with the water level, the reservoir water body 7 cannot enter the sleeve, and the flow passage water body 6 cannot be replenished in time. At this time, there is no water in the sleeve, the sleeve bears the external water pressure of the reservoir water body, when the water level of the reservoir water body 7 changes greatly, because the sleeve is composed of multiple sections, the height is large, and the external pressure at the bottom of the sleeve is large. A single-layer sleeve cannot meet the requirements of external pressure stability, and a double-layer sleeve greatly improves the ability to resist external pressure stability. With the help of the tower top bridge machine, the floating box 11 is interfered and pulled, which can improve the sleeve 16 blocking phenomenon.

[0048] The external pressure stability of the single-layer sleeve and the double-layer sleeve is calculated and compared. The double-layer sleeve of the present application is provided with a top stiffening ring, a middle stiffening ring and a bottom stiffening ring, the stiffening ring is 20mm thick, the sleeve is 5800mm high, the inner diameter of the sleeve is 2960mm, the outer diameter of the sleeve is 3240mm, the inner wall of the sleeve is 6mm, the outer wall of the sleeve is 6mm, and the gap between the inner and outer sleeves is 128mm. It is assumed that the single-layer sleeve is provided with a top stiffening ring and a bottom stiffening ring at both ends, the stiffening ring is 20mm thick, the sleeve is 5800mm high, the inner diameter of the sleeve is 2960mm, and the wall thickness of the single-layer sleeve is 12mm. The external pressure stability of the single-layer sleeve can be calculated according to the short pipe model with constraints at both ends, and according to the Mises formula in the “Design Code for Steel Pressure Pipes in Water Conservancy and Hydropower Engineering” (SL / T 281-2020), the calculated external pressure stability coefficient is 0.81, and the specification requires that the external pressure stability coefficient should not be less than 2. The stability coefficient calculated by the finite element method is 1.15, and the finite element calculation result is as follows: Figure 11The stability coefficient of the double-layer sleeve under external pressure is 2.07, which is calculated by the finite element method, and the finite element calculation result is shown in Table 1 Figure 12 The calculation result shows that the rigidity of the double-layer sleeve is obviously improved under the condition that the materials are similar, and the stability against external pressure is strengthened.

[0049] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any change or replacement within the technical range disclosed by the present application can be easily thought by any person skilled in the art, which should be covered within the protection scope of the present application.

Claims

1. A self-floating twin pontoon sleeve gate apparatus, characterised in that, The invention relates to a sleeve gate, which comprises two floating boxes, a top sleeve, a plurality of middle sleeves and a bottom sleeve.

2. The self-floating twin pontoon sleeve gate apparatus of claim 1, wherein, The trash rack device, the stoplog gate device and the accident gate device are sequentially arranged in the cavity between the water inlet and the parapet, a circular hole is formed in the bottom plate of the cavity, the bottom sleeve of the sleeve gate is arranged above the circular hole, and the water outlet channel starting from the circular hole is sequentially provided with the accident gate device and the arc-shaped working gate device.

3. The self-floating twin pontoon sleeve gate apparatus of claim 1, wherein, The top sleeve, the middle sleeve and the bottom sleeve are all double-layer structures and are sequentially connected from top to bottom.

4. The self-floating twin pontoon sleeve gate apparatus of claim 3, wherein, The top sleeve, the middle sleeve and the bottom sleeve have the same structure, which comprises a sleeve inner wall, a sleeve outer wall arranged outside the sleeve inner wall, a sleeve stiffening ring connecting the sleeve inner wall and the sleeve outer wall, a top limiting plate arranged on the top end of the sleeve stiffening ring, a bottom support, a bottom limiting plate and a supporting block arranged on the bottom support and a sealing sliding block arranged on the bottom limiting plate.

5. The self-floating twin pontoon sleeve gate apparatus of claim 4, wherein, The sleeve stiffening ring comprises a top end stiffening ring, a middle stiffening ring and a bottom end stiffening ring arranged from top to bottom and connected to the top, the middle and the bottom of the sleeve inner wall and the sleeve outer wall respectively. The top limiting plate is welded to the outside of the top end stiffening ring, the bottom support is welded to the outside of the bottom end stiffening ring, the supporting block is welded to the bottom support, bolt holes are formed in the bottom support for fixing the bottom limiting plate, bolt holes are formed in the bottom limiting plate for fixing the sealing sliding block, the bottom limiting plate is fixed to the bottom support by fasteners after the sleeve gate is installed, and the sealing sliding block is fixed to the bottom limiting plate by a pressing plate and bolts. During operation, the sleeve is stretched and contracted in the vertical direction, the top limiting plate and the bottom limiting plate of the lower sleeve prevent the upper sleeve and the lower sleeve from being separated, the upper limit position of the upper sleeve is that the upper surface of the pressing plate is in contact with the lower surface of the top limiting plate of the lower sleeve, and the lower limit position of the upper sleeve is that the bottom limiting plate falls on the supporting block of the lower sleeve.

6. The self-floating twin pontoon sleeve gate apparatus of claim 1, wherein, The two floating boxes are connected by a connecting beam.

7. The self-floating twin pontoon sleeve gate apparatus of claim 1, wherein, The upper part of the floating box is provided with a water filling and draining hole for filling and draining water in the floating box.

8. The self-floating twin pontoon sleeve gate apparatus of claim 1, wherein, The floating box is connected with the top sleeve by a connecting plate.

9. A method of using a self-floating twin pontoon sleeve gate apparatus, characterized by, The self-floating double floating box sleeve gate device comprises a trash rack device, a stoplog inspection door device, an emergency inspection door device, an arc-shaped working door device and a sleeve gate, the sleeve gate comprises two floating boxes, a top sleeve, a plurality of middle sleeves and a bottom sleeve, the trash rack device and the stoplog inspection door device are sequentially arranged in a cavity between a water inlet and a parapet, a circular hole is formed in a bottom plate of the cavity, the bottom sleeve of the sleeve gate is installed above the circular hole, a water outlet channel starting from the circular hole is sequentially provided with the emergency inspection door device and the arc-shaped working door device, the top sleeve, the plurality of middle sleeves and the bottom sleeve are all double-layer structures and are sequentially sleeved and connected from top to bottom, the two floating boxes are symmetrically arranged along a sleeve center line, the floating box is a closed cylindrical shape, an axis thereof is parallel to a water flow direction, and the floating box is connected with the top sleeve, the sleeve gate is suspended above the cavity under the action of reservoir water, surface water bodies enter the sleeve through spaces between the two floating boxes and side water bodies enter the sleeve through spaces between the floating boxes and the top sleeve to form flow channel water bodies, the trash rack device comprises a trash rack groove and a trash rack installed in the trash rack groove, the top sleeve, the middle sleeves and the bottom sleeve have the same structure and comprise a sleeve inner wall, a sleeve outer wall arranged outside the sleeve inner wall, a sleeve stiffening ring connecting the sleeve inner wall and the sleeve outer wall, a top end limiting plate installed on the sleeve stiffening ring, a bottom end support, a bottom end limiting plate and a support block installed on the bottom end support and a sealing sliding block installed on the bottom end limiting plate, the support block is used for supporting an upper sleeve, a sealing sliding block of a lower sleeve slides on an outer wall of the lower sleeve, so that the sleeves can slide up and down and have a certain sealing property, the top sleeve is without the top end limiting plate, and the bottom sleeve is without the bottom end limiting plate and the sealing sliding block. The sleeve gate is installed by using a tower top bridge machine to first install the bottom sleeve, a water stop rubber is arranged at a bottom end of the sleeve, and the bottom end is connected with the bottom plate by an anchor rod, after the bottom sleeve is completely positioned, the tower top bridge machine sleeves the middle sleeve into the bottom sleeve, installs the bottom end limiting plate and the sealing sliding block of the middle sleeve, and the same is repeated until all the sleeves are installed. The floating box of the sleeve gate is installed as follows: after the sleeve is installed, the floating box is hoisted to be connected with the top sleeve by a connecting plate, the installation is completed, and the two floating boxes are symmetrically arranged along the sleeve center line. Normal water taking: the trash rack is placed in the trash rack groove to intercept pollutants at the water inlet, the stoplog inspection door is placed in a stoplog inspection door storehouse, the reservoir water body enters the cavity, the sleeve gate is suspended above the cavity under the action of the reservoir water body, the surface water bodies enter the sleeve through the spaces between the two floating boxes and the side water bodies enter the sleeve through the spaces between the floating boxes and the top sleeve to form the flow channel water bodies, the floating box rises or falls with the change of the reservoir water body to realize stepless layered water taking, the emergency inspection door is locked above the hole by a hoisting rod, and the arc-shaped working door controls the flow of the flow channel water bodies by different opening degrees.

10. The method of using a self-floating twin pontoon sleeve gate apparatus as defined in claim 9, wherein, The device further comprises: The sleeve gate is maintained as follows: firstly, the radial working gate is closed in the flowing water state, then the stoplog maintenance gate is hoisted into the stoplog maintenance gate slot from the stoplog maintenance gate storehouse by means of the dam top bridge machine, the water between the stoplog maintenance gate and the radial working gate is pumped out, with the water body dropping, the float box and the sleeve drop, the water body in the sleeve is also pumped out, and finally the sleeve gate and the flow passage are maintained; during the maintenance, the upstream stoplog maintenance gate and the downstream radial working gate block the water, the float box and the sleeve are removed by the bridge machine, the reverse operation of the installation mode is performed, after the maintenance is completed, the horizontal pressure is filled, the float box slowly floats up, the stoplog maintenance gate is hoisted into the stoplog maintenance gate storehouse by the dam top gate machine, the radial working gate is opened, and the water is normally taken.

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