CN217678907U

CN217678907U - Low-head hydropower station is with hanging large-span dam entirely

Info

Publication number: CN217678907U
Application number: CN202221439740.1U
Authority: CN
Inventors: 顾坚毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-10-28
Anticipated expiration: 2032-06-09

Abstract

The utility model relates to a low flood peak power station is with hanging large-span dam entirely belongs to hydraulic equipment technical field. The utility model discloses a structure is including erectting the steel truss supporting body on the water course, the both ends of steel truss supporting body are supported by the reinforced concrete base that is close to the bank in the water course both sides, the lower part of steel truss supporting body is equipped with the lower chord member structure of jointing equipment, lower chord member structure lower part hangs and is connected with the flashboard unit group that hangs with water course width complex is complete, and each flashboard unit is by fixed cantilever, activity cantilever and nested between the activity cantilever, constitute along the flashboard that the activity cantilever reciprocated through the drive of hoist formula headstock gear. The utility model discloses a barrier-free flood discharge can be realized to the structure, does not relate to the migrant and removes to a large amount of silt deposit problems that are difficult to solve that dam class power station exists have been avoided very much ingeniously.

Description

Low-head hydropower station is with hanging large-span dam entirely

Technical Field

The utility model relates to a low flood peak power station is with hanging large-span dam entirely belongs to hydraulic equipment technical field.

Background

China has natural geography with high west and low east, great fall, and natural and huge hydropower resources. The existing domestic hydropower stations are mostly dam type hydropower stations with high water head (large potential energy). In addition, in the aspect of utilization of water resource power generation, the water energy resources with extremely wide and rich low water head (small potential energy), large kinetic energy and large flow are still worth utilizing. For example, spills, tailwaters of dam power plants; the water in the gorge river and river which are not in the rush at day and night. Compared with the photoelectric power station and the wind power station, the photovoltaic power station is greatly influenced by the irradiation intensity of sunlight and the imbalance of day and night alternation; wind power is greatly influenced by the imbalance of wind power. And the water energy resources with low water head, large kinetic energy and large flow are relatively constant and balanced. If the water energy resources can be reasonably utilized, the water energy resources can be used as a matching supplement scheme of a high-head dam hydropower station, and the utilization value of the water resources can be fully improved. The fully-suspended large-span dam for the low-head hydropower station is a precondition for utilizing the water energy resources. The existing dam power station is easy to seriously affect the natural original ecological environment due to the structural design of the gravity dam, easily generates the phenomenon of silt accumulation at the upstream and the bottom of the dam, and lacks an effective treatment method and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a low flood peak power station is with hanging large-span dam entirely and use.

The utility model discloses a low head dam combines little potential energy, big kinetic energy, large-traffic hydroelectric generating set's method to realize the utilization of low head hydroenergy resource. The technical problem is solved by the following technical scheme: the lower part of the steel truss bearing body is provided with a lower chord structural body connected with equipment, the lower part of the lower chord structural body is connected with a fully-suspended flashboard unit group matched with the width of the water channel in a hanging way, each flashboard unit consists of fixed cantilevers which are arranged in bilateral symmetry and the upper ends of which are fixed on the lower chord structural body in a hanging way, movable cantilevers which are nested in the inner cavity of the fixed cantilevers and driven by a screw hoist to move up and down along the inner cavity of the fixed cantilevers, and flashboards which are nested in the inner cavity of the fixed cantilevers and driven by the hoist to move up and down along the movable cantilevers; when the activity cantilever stretches into under water, with settle the foot anchor cooperation nested connection of riverbed bottom under water, fixed cantilever, activity cantilever, flashboard all are the suspension state, and wherein, fixed cantilever is static motionless all the time, and activity cantilever, flashboard are controllable developments suspension state. The controllable dynamic suspension state means that the movable cantilever and the flashboard can be controlled to reciprocate up and down along the corresponding guide rail.

The whole gate plate set capable of being hung completely is synthesized by a plurality of gate plate units capable of being hung completely, and large-span full hanging of the whole dam is achieved.

The utility model discloses a be different from the dam construction concept of traditional gravity dam completely, the gravity dam is the fixed high water head dam that is formed by reinforced concrete pouring from bottom to top. The dam of the utility model adopts a fully-suspended dam construction mode from top to bottom technically or structurally. Furthermore, the steel truss bearing body is integrally formed by a bearing stress steel frame-shaped truss structural body and an arched girder structural body. The lower part of the steel truss supporting body is provided with a lower chord structural body of a connecting device, and the lower chord structural body (seen from a top view) is formed by mutually connecting a left lower chord, a right lower chord, a longitudinal beam, a cross beam, a lower horizontal longitudinal joint and a node. The truss supporting body has the following maximum advantages: large span, light weight, large load bearing capacity and stable and reliable structure. The large-span canyon river can cross the gorges and rivers; can be customized in a factory according to the technical size of the structural component; the truss component materials in the decomposed state (and the dam components in the decomposed state) are convenient to transport in mountainous areas with poor roads; the assembly can be conveniently and quickly spliced on the site of a dam construction site, and the construction period is short.

Another important purpose (index) of the large-span truss support (and dam) is to keep the natural ecology of the river flow and the water channel to the maximum (basically, the basic riverbed and the bank slope are not changed, but the riverbed and the bank slope are allowed to be solidified and optimized).

Furthermore, the fixed cantilever is provided with a fixed cantilever structure body, the fixed cantilever structure body is formed by connecting an upper beam and a lower beam between each pair of fixed cantilevers, the back upper ends of the left fixed cantilever and the right fixed cantilever are respectively connected with a back left beam and a back right beam which are perpendicular to the back left beam and the back right beam, the tail ends of the back left beam and the back right beam are connected through the back beams, inclined support frames are respectively fixed between the back left beam and the back right beam and the left fixed cantilever and between the back right beam and the right fixed cantilever, a screw hoist is arranged at the tops of the left fixed cantilever and the right fixed cantilever, and a winch hoist is fixedly arranged on the upper beam. The fixed cantilever structure can ensure the stability and the strength of the fixed cantilever.

Fixed cantilever (from the section view) has the rectangle shell, the strengthening rib is all settled at four angles of rectangle shell inner wall, form 45 contained angles between strengthening rib and the adjacent shell inner wall, two adjacent strengthening ribs reach the concave type track that forms restraint activity cantilever lift between, install the antifriction engineering plastics gasket strip with activity cantilever contact on every strengthening rib.

The four corners of activity cantilever cooperatees with the shape of strengthening rib in the fixed cantilever, the middle part of the vertical direction of a pair of activity cantilever facies in the flashboard unit has with the concave type track groove of flashboard both ends shape complex, the cavity of two shape symmetries is divided into with the inner chamber of activity cantilever in concave type track groove, the sealing rubber strip is installed to the radial upstream face in spill track inslot, the top central authorities of activity cantilever are fixed with the lifting screw, the lifting screw meshes with the lift nut of screw headstock gear, the fixed rectification set-square of upstream face of activity cantilever lower part plays the water conservancy diversion effect. When the lifting nut rotates forwards or reversely, the lifting screw rod is lifted or lowered to drive the movable cantilever to lift or lower.

The gate plates in the fully-suspended gate plate unit group can be divided into an intelligent discharge gate plate, a water storage gate plate and a water discharge acting gate plate according to functions, and the water discharge acting gate plate is arranged in a matched manner with a corresponding water turbine; each flashboard is the steel flashboard, the steel flashboard comprises inside steel skeleton and outside steel sheet welding, the left and right sides of steel flashboard have with the concave type track groove shape complex protruding shape portion of activity cantilever, the top of steel flashboard is fixed with 2 and promotes the pulley, promote the steel cable of pulley connection hoist and close machine.

The foot anchor is made of steel and is arranged on the positive and negative zero reference surfaces of the underwater foundation at a position determined by technical design, and the foot anchor comprises a steel shell which is positioned on the positive and negative zero reference surfaces of the underwater foundation and can be correspondingly nested in one cavity of the movable cantilever and a reinforced concrete anchor ingot which is positioned under the positive and negative zero reference surfaces of the underwater foundation.

The screw hoist consists of a motor, a reduction gear box and a screw lifting gear box; the hoisting hoist is a double-hoisting-point hoisting hoist and consists of a motor, a reduction gear box, a brake disc, a steel cable roller and a steel cable.

The utility model further provides an application of the fully-suspended large-span dam for the low-head hydropower station, wherein the dam comprises three working states, namely a water storage state, a water discharge working state and a flood discharge state; when the dam is in a water storage state, the screw hoist drives the movable cantilever to move downwards and is fixedly connected with the foot anchor of the underwater riverbed reference surface in a nested manner, the winch hoist drives the gate plate to move downwards to the bottom of the riverbed to start water storage, and the intelligent drainage gate plate can move upwards to drain, so that the water storage water level line is kept at a rated height; when the dam is in a flood drainage state, part or all of the flashboards move upwards to drain water. The river bed and the bank slope in the area near the dam are solidified and optimized by reinforced concrete according to design requirements, the anchor ingot part of the installation foundation of the foot anchor is positioned and manufactured according to the design, and a steel connecting embedded part is manufactured, wherein the embedded part is a reinforced concrete anchor ingot.

The utility model discloses a dam height (flood peak) of simulation design is 3.5 meters, and the width is about 70 meters. If the upstream regular water source channel is 1000-2000 m long, at least the water can be stored as 3.5 m high water head (potential energy), the storage capacity is 40-50 ten thousand cubic meters, and the dynamic water energy resource can be supplemented with water all the time.

The utility model relates to a dam body of full suspension type completely different with gravity dam. The adopted material is a steel sluice, and the constructed dam is a non-fixed and controllable low-head dynamic dam completely. The water channel may be in a dammed state or a non-dammed state. A brand-new dam existence mode and dam utilization mode are formed. Therefore, a series of revolutionary changes in dam and hydropower development and application are brought. Particularly, the serious change or damage of the natural ecological environment caused by the dam construction of the dam power station is avoided, and the serious influence caused by the sediment accumulation at the upstream and the bottom of the dam which are difficult to eliminate and are generated by the dam power station is completely avoided. Therefore, a brand new way for developing and constructing hydropower stations with low water heads, large kinetic energy and large flow is developed. Fills the blank in the aspect at home (internationally). Through the full-suspension design, the low-head dam does not affect the riverbed and the bank slope, does not affect the natural ecology of the river and the two banks of the river water channel, does not affect the normal flow of the river, realizes barrier-free flood discharge, does not relate to the removal of migrants, and particularly skillfully avoids the problem of a large amount of sediment deposition which is difficult to solve in dam-type power stations. The beneficial effects are as follows: the application range is extremely wide, and the construction method is relatively simple and convenient. The method provides important preconditions for development and application of low-water-head, large-flow and high-kinetic-energy hydropower stations. Has great market application prospect, may lead to the development revolution of novel hydropower, drives huge and large-scale novel hydropower industry, and has great social and economic benefits.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a schematic structural view of the shutter unit group in fig. 1.

Fig. 4 is a schematic structural diagram of the fixed cantilever structure set in fig. 2.

Fig. 5 is a schematic view of the structure of fig. 1 in which the fixed cantilever and the movable cantilever are engaged.

Fig. 6 is a schematic structural diagram of the movable cantilever in fig. 1.

Fig. 7 is a schematic structural view of the shutter in fig. 1.

Fig. 8 is a schematic view of the foot anchor of fig. 1.

FIG. 9 is a top view of the lower chord structure of FIG. 1.

Detailed Description

Example 1

The structure of this embodiment is as shown in fig. 1-9, and a large-span dam for a low head hydropower station comprises a steel truss bearing body erected on a water channel, wherein the steel truss bearing body is formed by splicing (including bolt connection, riveting and welding) prefabricated structural steel, the steel truss bearing body is formed by integrating a bearing stressed steel frame-shaped truss structural body 2 and a steel arched girder structural body 1 which is cylindrical (or rectangular) in shape, and the steel truss bearing body is used as a large-span steel truss bearing body and is used for bearing a fully-suspended steel dam assembly. The lower part of the steel truss bearing body is a lower chord structural body 3 used for connecting and installing a steel full-suspension dam, and the lower chord structural body 3 (seen from a top view) is formed by mutually connecting a left lower chord 3-1, a right lower chord 3-2, longitudinal beams 3-3, cross beams 3-4, lower flat longitudinal links 3-5 and nodes 3-6. The two ends of the steel truss bearing body are fixedly supported by bases 9 which are arranged on the two sides of the water channel and close to the bank edge, and the bases of the truss bearing body are made of reinforced concrete. The steel truss supporting body is provided with a plurality of groups of full-suspension unit groups matched with the width of the water channel, one unit group of the full-suspension unit group is matched with the water turbine assembly 11, and each unit consists of a fixed cantilever 6 which is arranged in bilateral symmetry and the upper end of which is fixed on the lower chord structure body, a movable cantilever 7 which is embedded in the inner cavity of the fixed cantilever and driven by a screw hoist 4 to move up and down along the inner cavity of the fixed cantilever 6, and a flashboard 8 which is embedded between the movable cantilevers 7, driven by a winch hoist 5 and moved up and down along the movable cantilever 7; when the movable cantilever 7 extends into the water for fixing, the movable cantilever is matched and nested with a foot anchor 10 arranged under the water. In the flashboard unit group, each pair of fixed cantilevers 6 are connected by an upper cross beam 6-1 and a lower cross beam 6-2, the upper ends of the backs of the left and right fixed cantilevers are respectively connected with a back left cross beam 6-5 and a back right cross beam 6-6 which are vertical to the left and right fixed cantilevers, the tail ends of the back left cross beam 6-5 and the back right cross beam 6-6 are connected by a back cross beam 6-4, and oblique support frames 6-3 are respectively fixed between the back left and right cross beams and the left and right fixed cantilevers. The top parts of the left and right fixed cantilevers are provided with a screw hoist 4, and the upper beam is fixed with a winch hoist 5.

From the top view section view, the fixed cantilever 6 is provided with a rectangular shell 6-7, four corners of the inner wall of the rectangular shell 6-7 are respectively provided with a fixed cantilever reinforcing rib 6-8, the reinforcing ribs are welded at the right angles of the steel plates at two sides, a 45-degree included angle is formed between each reinforcing rib and the adjacent inner wall of the shell, two adjacent reinforcing ribs 6-8-1 and 6-8-2 and a connecting steel plate 6-8-3 between the two adjacent reinforcing ribs form a concave track for restricting the movable cantilever to lift, namely, the 45-degree cut angle parts of the two adjacent reinforcing ribs relative to the movable cantilever are concave guide rails. Each reinforcing rib is provided with an anti-friction engineering plastic gasket strip 6-9 which is in contact with the movable cantilever and is used for meeting the requirements of stress support and friction of the movable cantilever. The fixed cantilever is used for bearing the movable cantilever, and particularly, the movable cantilever is embedded in an inner cavity of the fixed cantilever, and the movable cantilever can move up and down in the inner cavity of the fixed cantilever. In the gate plate unit group, each group is provided with a left and a right pair of movable cantilevers 7. From the top view section view, the four corners of the movable cantilever 7 are matched with the shape of the fixed cantilever reinforcing rib, specifically, the two adjacent corners 7-3-1 and 7-3-2 of the movable cantilever and the connecting surface 7-3-3 between the two corners form a convex guide rail 7-3 of a movable cantilever shell which is matched with the shape of a concave track formed by the fixed cantilever reinforcing rib and the connecting steel plate, the middle part of the vertical direction of the opposite surface of the movable cantilever is provided with a concave track groove 7-6 matched with the convex shapes at the two ends of the flashboard, the concave track groove is matched with the convex bodies at the left side and the right side of the flashboard with a gap, the convex ends of the flashboard can be embedded in the concave track groove, and the flashboard can move up and down in the track groove. Therefore, the flashboard can play two roles of water blocking and water discharging. The concave track groove divides the inner cavity of the movable cantilever into two cavities with symmetrical shapes, a sealing rubber strip 13 is arranged on the radial upstream surface in the concave track groove, and the sealing rubber strip is used for preventing the excessive loss of radial water and the large amount of water leakage (allowing a small amount of leakage) in the dam. The movable cantilever is nested in the fixed cantilever and can move up and down in the fixed cantilever. The center of the top of the movable cantilever is provided with a lifting screw 7-4, the lifting screw 7-4 is meshed with a lifting nut of a lifting gear box of the screw hoist, and the lifting nut is a lifting bevel gear type nut 7-5 which is provided with bevel gears 7-7 and gear pads 7-8. When the lifting nut is driven by the top speed reducer to rotate forwards or reversely, the lifting screw rod can be driven to move up and down, and therefore the movable cantilever is driven to move up and down. When the movable cantilever moves to the bottom, the movable cantilever can be combined with an underwater steel foot anchor at the bottom (the design position of the riverbed bottom datum plane + -0) in a nesting mode. At the moment, the upper part of the movable cantilever and the steel underwater foot anchor form two stressed supporting points facing radial incoming water. Under the support of a pair of movable cantilevers, the gate plate therein plays a role of water blocking (water storage) when sinking to the bottom. In a dam system, the movable cantilevers are applied in pairs. Depending on the total width of the dam, N sets (pairs) of movable cantilevers can be designed. And a rectification triangle plate 7-9 is welded and fixed on the upstream surface of the lower part of the movable cantilever.

The gate plates in the complete suspension unit group are basic and important dam body components for water blocking (water storage) or water discharging. Each flashboard is a steel flashboard 8, the steel flashboard 8 is formed by welding an internal steel framework and an external steel plate, namely, the inner core of the board is a steel structural framework, and the external steel plate is welded. The steel gate plate 8 has left and right convex portions 8-1 fitted in the concave track grooves of the movable cantilevers, and the gate plate can move up and down in the pair of concave track grooves 7-6 of the movable cantilevers. When the gate plate moves to the bottom, the function of water blocking (water storage) is achieved. When the flashboard is lifted, the function of discharging water is achieved. A pair of lifting pulleys 8-2 are fixed at the top of the steel gate plate, and the lifting pulleys 8-2 are used for connecting lifting steel cables. The gate plate moves up and down under the traction of a steel cable 5-2 of a hoisting hoist on a fixed cantilever upper beam.

In a dam system, N groups of gate plates can be designed according to the length of the dam. The N groups of shutters function differently. The intelligent drainage system is divided into a water storage flashboard 8-3, an intelligent drainage flashboard 8-4 and a water discharge working flashboard 8-5. The effect of intelligence earial drainage flashboard is, when the water that comes upstream is too big, in time discharges out water, guarantees that the horizontal level height of retaining is the rated height. The intelligent control system is characterized in that the winch hoist receives an instruction of the existing dam intelligent control system to lift or lower the height of the flashboard. The function of the water discharging acting gate plate is that after the gate plate is lifted to a specified height and opened, the discharged water can impact the rotor of the water turbine to rotate and act, so that the generator is driven to generate power. When the flood season, can stop to generate electricity, all flashboards all rise, can unhindered the water of draining down and pass through.

The foot anchor 10 is made of steel plates according to the technical design requirements, is installed at the technically established position of a positive and negative zero (+ -0) datum line (surface) 12 of an underwater foundation, and comprises a steel shell 10-1 and a reinforced concrete anchor ingot 10-4, wherein the steel shell is positioned on the positive and negative zero datum surfaces of the underwater foundation and can be correspondingly nested in a cavity of the movable cantilever, and the reinforced concrete anchor ingot is positioned under the positive and negative zero datum surfaces of the underwater foundation. The shell 10-1 is provided with a foot anchor mounting base 10-2 and is fixed on a reinforced concrete anchor 10-4 through foot anchor mounting screw holes and foot anchor mounting bolts 10-3. Foot anchors are the most important point of stress for dam systems. The dam system has the function of fixing and stabilizing the lower end of the movable cantilever, and under the combined action of the steel truss and the foot anchor, the dam system can bear the radial thrust of water storage. The radial thrust of the stored water is in direct proportion to the water storage height of the dam body. The design of the steel truss and the underwater steel foot anchor has the advantage that the thrust redundancy is obviously greater than the radial thrust of stored water. The riverbed and the bank slope in the area near the dam are solidified and optimized by reinforced concrete 14 according to the design requirements, the installation base part of the foot anchor is positioned according to the design, a connecting embedded part 10-5 is manufactured, and a reinforced concrete anchor ingot 10-4 is fixed in the reinforced concrete 14.

The dam may be connected to an existing control system for controlling the opening and closing of the gate.

The screw hoist 4 is composed of a motor, a reduction gear box and a screw lifting gear box, and when the motor rotates forwards or backwards, the movable nut is driven by the driver 7-1 to rotate forwards or backwards. Thereby, the screw rod can be driven to move upwards or downwards. The movable cantilever can be driven to move upwards or downwards due to the upward or downwards movement of the screw rod.

The winding hoist 5 is composed of a motor, a reduction gear box, a brake, four steel cable pulleys 5-1, a steel cable roller and a steel cable 5-2, and the gate 8 can be lifted by the forward rotation of the motor. The shutter 8 can be lowered by rotating in the reverse direction.

During operation, the dam has three operating condition, is the water storage state respectively, drains acting state and flood drainage state: when the dam is in a water storage state, the screw hoist is controlled to drive the movable cantilever to move downwards and be fixedly connected with the underwater foot anchor in a nested manner, the winch hoist is controlled to drive the gate plate to move downwards to a specified position (the bottom of a riverbed is plus or minus 0 part), water storage is started, and finally the intelligent drainage gate plate is controlled to move upwards to keep the water level line at a rated height; when the dam is in a flood discharge and drainage state, part or all of the gate plates are controlled to move upwards for drainage. The working sequence of the movable cantilever and the gate plate is as follows: when water is stored, the movable cantilever is firstly lowered to the position, and the gate plate is then lowered to the position; when water is discharged, the flashboard is lifted to the right position, and the movable cantilever is lifted to the right position.

In addition to the above embodiments, the present invention can also have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a low head hydropower station is with hanging large-span dam entirely which characterized in that: the device comprises a steel truss bearing body erected on a water channel, wherein two ends of the steel truss bearing body are supported by reinforced concrete bases close to the bank side on two sides of the water channel, the lower part of the steel truss bearing body is provided with a lower chord member structure body connected with equipment, the lower part of the lower chord member structure body is connected with a fully-suspended flashboard unit group matched with the width of the water channel in a hanging manner, and each flashboard unit consists of a fixed cantilever, a movable cantilever and a flashboard, wherein the fixed cantilever is arranged in a bilateral symmetry manner, the upper end of the fixed cantilever is fixed on the lower chord member structure body in a hanging manner, the movable cantilever is embedded in an inner cavity of the fixed cantilever and driven by a screw type hoist to move up and down along the inner cavity of the fixed cantilever, and the flashboard is embedded between the movable cantilevers and driven by the hoist type hoist to move up and down along the movable cantilever; when the movable cantilever stretches into underwater, the movable cantilever is matched and nested with a foot anchor arranged at the bottom of an underwater riverbed, the fixed cantilever, the movable cantilever and the flashboard are all in a hanging state, and the movable cantilever and the flashboard are in a controllable dynamic hanging state.

2. The fully suspended large span dam for low head hydroelectric power stations of claim 1 wherein: the steel truss bearing body is formed by integrating a bearing steel frame truss structure body and an arched girder structure body.

3. The fully suspended large span dam for low head hydroelectric power stations as defined in claim 1, wherein: the fixed cantilever is provided with a fixed cantilever structure body, the fixed cantilever structure body is formed by connecting an upper cross beam and a lower cross beam between each pair of fixed cantilevers, the back upper ends of the left and right fixed cantilevers are respectively connected with a back left cross beam and a back right cross beam which are perpendicular to the back left cross beam and the back right cross beam, the tail ends of the back left cross beam and the back right cross beam are connected through the back cross beam, inclined support frames are respectively fixed between the back left and right cross beams and the left and right fixed cantilevers, a screw type hoist is arranged at the tops of the left and right fixed cantilevers, and a winch type hoist is fixedly arranged on the upper cross beam.

4. The fully suspended large span dam for low head hydroelectric power stations as defined in claim 3, wherein: the fixed cantilever has a rectangular shell, reinforcing ribs are arranged at four corners of the inner wall of the rectangular shell, a 45-degree included angle is formed between each reinforcing rib and the adjacent inner wall of the shell, two adjacent reinforcing ribs and a connecting steel plate between the two adjacent reinforcing ribs form a concave track for restricting the lifting of the movable cantilever, and an anti-friction engineering plastic gasket strip in contact with the movable cantilever is arranged on each reinforcing rib.

5. The fully suspended large span dam for low head hydroelectric power stations of claim 4 wherein: the utility model discloses a fixed cantilever of activity cantilever, including the reinforcing rib, the top of activity cantilever, the four corners of activity cantilever and fixed cantilever in cooperate the shape of reinforcing rib cooperate, the middle part of the vertical direction of a pair of activity cantilever facies in the flashboard unit have with the concave type track groove of flashboard both ends shape complex, the cavity of concave type track groove with the inner chamber of activity cantilever fall into two shape symmetries, the radial upstream face of concave type track inslot installs the sealing rubber strip, the fixed lifting screw in top central authorities of activity cantilever, lifting screw meshes with the lifting nut of screw headstock gear, the fixed rectification set-square of upstream face of activity cantilever lower part.

6. The fully suspended large span dam for low head hydroelectric power stations of claim 1 wherein: the gate plates in the fully-suspended gate plate unit group can be divided into an intelligent discharge gate plate, a water storage gate plate and a water discharge acting gate plate according to functions, and the water discharge acting gate plate is arranged in a matched manner with a corresponding water turbine; each flashboard is the steel flashboard, the steel flashboard comprises inside steel skeleton and outside steel sheet welding, the left and right sides of steel flashboard have with the concave type track groove shape complex protrusion shape portion of activity cantilever, the top of steel flashboard is fixed with 2 and promotes the pulley, promote the steel cable that the pulley connection hoist formula headstock gear.

7. The fully suspended large span dam for low head hydroelectric power stations as defined in claim 1, wherein: the foot anchor is made of steel and is arranged on the positive and negative zero reference surfaces of the underwater foundation at a position determined by technical design, and the foot anchor comprises a steel shell which is positioned on the positive and negative zero reference surfaces of the underwater foundation and is correspondingly nested in one cavity of the movable cantilever and a reinforced concrete anchor ingot which is positioned below the positive and negative zero reference surfaces of the underwater foundation.

8. The fully suspended large span dam for low head hydroelectric power stations of claim 3 wherein: the screw hoist consists of a motor, a reduction gear box and a screw lifting gear box; the winding hoist consists of a motor, a reduction gear box, a brake disc, a steel cable roller and a steel cable.