Movable water inlet for positioning head buoy
Technical Field
The invention relates to a water inlet structure in water conservancy and hydropower engineering, in particular to a movable water inlet structure which can be far away from a reservoir bank and is positioned by a head buoy with a fixed height below the water surface and used for taking water along with the fluctuation of the water surface.
Background
Large reservoir capacity, low water fluidity, and water quality is affected by water temperature, and layering phenomenon often exists in water quality. The surface water close to the water surface has high temperature and high content of dissolved oxygen, is an ideal point for irrigation and water supply and water intake, and the deep water close to the bottom of the reservoir has lower concentration of dissolved oxygen due to organic matter decomposition and relatively higher content of mineral substances, and is generally only used as a water intake point when the low-temperature characteristic of the water body is needed to be utilized, so that the water supply engineering is not adopted greatly.
When the pressurized water supply system takes water, the water inlet is generally arranged at least 2.0m below the water surface in order to meet the requirement of minimum submerged depth. Because the reservoir water level is the water inlet of undulant, fixed elevation design, when the reservoir water level is higher, often can't get high-quality top layer water, and when the reservoir water level is lower, can't get water because the water inlet submerges the degree of depth inadequately again.
In order to solve the problem that when the water level amplitude of the reservoir is large, the surface water is difficult to take, a layered water taking structure is often adopted in engineering, namely, a water taking tower is arranged at the side of the reservoir, layered water inlets with different heights are arranged in the water taking tower, the layered water inlets are generally two-three layers, the two-layer water inlets are divided into an upper-layer water inlet and a lower-layer water inlet from top to bottom according to the height, and a middle-layer water inlet is additionally arranged in the middle of the three layers of water inlets. When the water level of the warehouse is higher, the upper water inlet and the middle water inlet can be started when the submerged depth is met, and when the water level of the warehouse is lower, the lower water inlet can be started to take water.
The layered water taking structure can be used for taking water bodies of the water warehouse relatively close to the surface layer, but because the height of the water inlet is always fixed, when the water level of the warehouse is slightly changed, the water taking depth cannot be adjusted along with the water surface at any time, the efficiency of taking the surface layer water is relatively low, when the water level of the warehouse is greatly changed, the water warehouse needs to be switched on and off at different heights Cheng Zhamen, and the operation management is also troublesome.
In addition, the built large-scale reservoir adopts a layered water taking structure to take water, so that the vertical shaft type water inlet is not applicable, a shore tower type water inlet is needed, and a construction cofferdam is needed to be arranged for construction. When the underwater part of the construction cofferdam is removed, often time and labor consuming. In order to avoid that slurry enters a water delivery tunnel to deposit when the underwater part of the construction cofferdam is removed, a water inlet gate cannot be opened to be put into operation when the underwater cofferdam is removed, and great influence is exerted on engineering benefit.
Disclosure of Invention
The invention aims to overcome the defect that a water inlet with a fixed elevation is difficult to flexibly take high-quality water on the surface layer, and provides a movable water inlet with a head buoy positioned, wherein a large-diameter Polyethylene (PE) water supply pipe is connected to a water inlet gate with the fixed elevation, and the head of the water supply pipe extends to be below the water level of a warehouse far away from a warehouse bank part and is fixed by adopting the buoy; on one hand, the problem of automatic lifting of the water level amplitude of the water inlet Gao Chengsui reservoir is solved, and on the other hand, for the layered water taking structure, when the underwater part of the construction cofferdam is dismantled, the water inlet extends into the reservoir, so that the construction of the cofferdam is dismantled and the water taking operation of the engineering is not wrong, and the benefit of the water supply engineering is brought into play in advance.
The technical scheme adopted by the invention is as follows:
A movable water inlet for positioning a head buoy comprises a pipeline system, a buoy system and a custom gate. The floating pontoon system is arranged at intervals along the pipeline system and mainly plays a role in fixing the design depth of floating pipes of the pipeline system below the water surface, the custom gate is positioned at the tail end of the pipeline system and is a water retaining structure, and water in the pipeline system flows to a flow passage of a downstream water delivery tunnel along a fixed pipeline on the custom gate.
The pipeline system comprises a water taking head, a floating pipe and a flange joint. The water taking head is a steel pipeline and is positioned at the front end of the floating pipe, and the water taking head and the floating pipe are connected by adopting a flange joint. The water intake head consists of a tube shell, rib plates and a reinforcing steel bar net. The pipe shell is of a steel bell mouth structure, rib plates are arranged at the enlarged end of the pipe shell in the longitudinal and transverse directions to strengthen the pipe shell, and are used for fixing the reinforcing mesh, and the reinforcing mesh is positioned at the front edge of the pipe shell to prevent large suspended matters from entering the pipeline system. The floating pipe is a main structure of a pipeline system, and can be arranged in a large-diameter Polyethylene (PE) pipe extending towards a reservoir along a water inlet channel in a water taking gate, one end of the floating pipe is connected with a water taking head through a flange joint, the other end of the floating pipe is connected with a custom gate through the flange joint, the length of the floating pipe is determined according to the water taking extension length, the pipe diameter is determined according to the water supply quantity, the floating pipe system arranged in a sectionalized mode is fixed at a certain depth under water, at least two flange joints are used for connecting the floating pipe with the water taking head, one of the flange joints is used for connecting the floating pipe with the custom gate, and when the length of the floating pipe is large, the floating pipe can also be prefabricated in a sectionalized mode and then is connected by adopting the flange joint after the water surface is fixed.
The buoy system is positioned at the front end of the pipeline system, and the water taking head is fixed through a floating pipe at the rear part of the water taking head. The buoy system consists of a buoy, an anchor chain, a sinker and a fixing frame. The buoy is a stainless steel hollow cylinder, the bottom of the buoy is connected with an anchor chain, the surface of the anchor chain is welded with the fixing frame, one end of the anchor chain is connected with the buoy to reduce the moving range of the buoy, the other end of the anchor chain is connected with the sinker, the sinker can adopt a cast iron structure or precast concrete blocks, the buoy is fixed through the anchor chain by relying on dead weight, the water surface part of the fixing frame is welded and fixed with the buoy, and the underwater part is provided with a square hole fixed floating pipe.
The buoy system can adopt two anchor chains or a single anchor chain or 3 anchor chains, and when the number of the anchor chains is large, the positioning effect of different angle dispersion arrangement on the buoy is better.
The pontoon system adopts multistage arrangement for fixed pontoon is at certain degree of depth below the surface of water, comprises pontoon, wire rope, balancing weight. The pontoon is a cylindrical hollow plastic barrel, and the buoyancy is greater than the dead weight of the pontoon pipe and the weight of the counterweight; the upper part of the steel wire rope is connected with the pontoon, the middle part is bound with the floating pipe, the bottom part is connected with the balancing weight, and the balancing weight is a precast concrete block for preventing the floating pipe from floating to the water surface when no water exists in the floating pipe.
The custom gate is located at the water gate orifice, and is different from the conventional gate in that the custom gate has more structures such as fixed pipelines, steel choke plugs, air valves and the like besides the gate panel. The gate panel is of a gate water retaining structure, is similar to a conventional gate panel structure except that a hole is formed in a fixed pipeline, the fixed pipeline is of a bent pipe structure, one end of the fixed pipeline is connected with a floating pipe through a flange joint, the other end of the fixed pipeline is opened in the gate panel, so that water enters a water delivery tunnel at the rear part of the water taking gate, a steel choke plug is positioned at the top end of the fixed pipeline and is used for sealing the top of the fixed pipeline, an air valve is arranged at the top of the steel choke plug and is positioned on the steel choke plug, the air valve is used for exhausting when the floating pipe is filled with water for the first time, and the air valve can be automatically closed when exhausting is finished.
The pipeline system can be arranged in a double-pipe mode, namely two pipeline systems are arranged, and can be arranged in a single-pipe mode, namely one pipeline system is arranged. When the single-tube arrangement is adopted, 1 pipeline is directly canceled between the two buoys.
The invention has the beneficial effects that:
(1) The water taking point and the water taking elevation are flexible. The water taking head can extend to the position with wide terrain and excellent water quality in the warehouse, the water taking elevation can automatically fluctuate according to the free water surface, and the high-quality surface water below the water taking surface can be ensured.
(2) The automatic degree is high along with the rise and fall of the water level. No matter the water level is greatly changed or slightly fluctuated, the pipeline system can always keep a fixed distance from the water surface under the drive of the buoy system and the buoy system, the gate is not required to be opened or closed by manual operation, and the degree of automation is high.
(3) The underwater cofferdam dismantling and the tunnel water supply operation can be synchronously carried out. Because the water taking head can extend to the storehouse of keeping away from water inlet construction cofferdam to get water, muddy water that construction produced can not get into water inlet and water delivery tunnel under water cofferdam is demolishd, consequently, can normally supply water operation when under water cofferdam construction, avoid under water cofferdam construction to become progress short slab, be favorable to engineering water supply benefit to exert in advance.
Drawings
FIG. 1 is a plan view of an embodiment of the present invention
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view C-C of FIG. 1;
FIG. 5 is a D-D cross-sectional view of FIG. 3;
FIG. 6 is a sectional view E-E of FIG. 5;
Fig. 7 is a detailed view of the structure of the custom gate according to the embodiment of the present invention.
In the figure, the water-taking device comprises a 1-pipeline system, a 11-water taking head, a11 a-pipe shell, a11 b-rib plate, a11 c-reinforcing mesh, a 12-floating pipe, a 13-flange joint, a 2-buoy system, a 21-buoy, a 22-anchor chain, a 23-counter weight, a 24-fixing frame, a 3-buoy system, a 31-buoy, a 32-steel wire rope, a 33-balancing weight, a 4-custom gate, a 41-gate panel, a 42-fixing pipeline, a 43-steel choke plug, a 44-air valve, a 5-water taking gate, a 6-water delivery tunnel and a 7-water inlet channel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-7, the movable water inlet for positioning the head buoy comprises a pipeline system 1, a buoy system 2, a buoy system 3 and a custom gate 4. The floating pontoon system 3 is arranged at intervals along the pipeline system 1 and mainly plays a role of fixing a floating pipe 12 of the pipeline system 1 to a designed depth below the water surface, the custom gate 4 is positioned at the tail end of the pipeline system 1 and is a water retaining structure, and water in the pipeline system 1 flows to a flow passage of the downstream water delivery tunnel 6 along a fixed pipeline 42 on the custom gate 4.
The pipe system 1 comprises a water intake head 11, a float pipe 12 and a flange joint 13. The water taking head 11 is a steel pipeline and is positioned at the front end of the floating pipe 12, and the water taking head is connected with the floating pipe 12 by adopting a flange joint 13. The water intake head 11 is composed of a tube shell 11a, rib plates 11b and a reinforcing mesh 11 c. The pipe shell 11a is of a steel bell mouth structure, rib plates 11b are arranged at the enlarged end of the pipe shell 11a in the longitudinal and transverse directions to strengthen the structure of the pipe shell 11a and fix the reinforcing mesh 11c, and the reinforcing mesh 11c is positioned at the front edge of the pipe shell 11a to prevent large suspended matters from entering the pipeline system 1. The floating pipe 12 is a main structure of the pipeline system 1, and can be made of a large-diameter Polyethylene (PE) pipe, and is arranged in the water intake gate 5 to extend to a reservoir along the water intake channel 7, one end of the floating pipe 12 is connected with the water intake head 11 through a flange joint 13, the other end of the floating pipe 12 is connected with the custom gate 4 through the flange joint 13, the length of the floating pipe 12 is determined according to the water intake extension length, the pipe diameter is determined according to the water supply quantity, the floating pipe system 3 which is arranged in a segmented mode is fixed under water for a certain depth, at least two flange joints 13 are used for connecting the water intake head 11 with the floating pipe 12, one is used for connecting the floating pipe 12 with the custom gate 4, and when the length of the floating pipe 12 is large, the floating pipe can also be prefabricated in a segmented mode, and then is connected by adopting the flange joint 13 after the water surface is fixed.
The buoyancy system 2 is located at the front end of the pipe system 1 and secures the water intake head 11 by securing a float pipe 12 at the rear of the water intake head 11. The buoy system 2 consists of a buoy 21, an anchor chain 22, a counter weight 23 and a fixing frame 24. The buoy 1 is a stainless steel hollow cylinder, the bottom of the buoy 1 is connected with an anchor chain 22, the surface of the anchor chain is welded with a fixing frame 24, one end of the anchor chain 22 is connected with the buoy 21, the moving range of the buoy 21 is reduced, the other end of the anchor chain is connected with a counter weight 23, the counter weight 23 can adopt a cast iron structure or precast concrete blocks, the buoy 21 is fixed through the anchor chain 22 by means of self weight, the water surface part of the fixing frame 24 is welded and fixed with the buoy 21, and a square hole is formed in the underwater part to fix the floating pipe 12.
The buoy system 2 can adopt two anchor chains 22 or can adopt a single anchor chain or 3 anchor chains 22, and when the number of the anchor chains 22 is large, the positioning effect of different angle dispersion arrangements on the buoy 21 is better.
The pontoon system 3 is arranged in a plurality of sections and is used for fixing the pontoon 12 to a certain depth below the water surface, and consists of a pontoon 31, a steel wire rope 32 and a balancing weight 33. The floating drum 31 is a cylindrical hollow plastic bucket, the buoyancy is larger than the self weight of the floating pipe 12 and the weight of the balancing weight 33, the upper part of the steel wire rope 32 is connected with the floating drum 31, the middle part of the steel wire rope is bound with the floating pipe 12, the bottom of the steel wire rope is connected with the balancing weight 33, and the balancing weight 33 is a precast concrete block for preventing the floating of the floating pipe 12 to the water surface when no water exists.
The custom gate 4 is located at the opening of the take-off gate 5, and differs from the conventional gate in that there are more fixed pipes 42, steel plugs 43, air valves 44, etc. in addition to the gate panel 41. The gate panel 41 is of a gate water retaining structure, and is similar to a conventional gate panel structure except that a hole is formed in the position of a fixed pipeline 42, the fixed pipeline 42 is of a bent pipe structure, one end of the fixed pipeline 42 is connected with the floating pipe 12 through a flange joint 13, the other end of the fixed pipeline is opened in the gate panel 4 so that water enters a water delivery tunnel 6 at the rear part of the water taking gate 5, a steel choke plug 43 is positioned at the end part of the fixed pipeline 42 and is used for sealing the top part of the fixed pipeline 42, an air valve 44 is arranged at the top part of the steel choke plug 43, the air valve 44 is positioned on the steel choke plug 43 and is used for exhausting when the floating pipe 12 is filled with water for the first time, and the air valve can be automatically closed when exhausting is finished.
The pipe system 1 can be arranged in both double pipes and single pipes. When the single-pipe arrangement is adopted, if the water taking head 11 is fixed by adopting the buoy system 2, 1 pipeline is directly omitted between the two buoys 21.
The above embodiments are described in connection with the accompanying drawings, but are not to be construed as limiting the scope of the invention, and it should be noted that the technical solutions obtained by equivalent substitution or equivalent transformation to those skilled in the art without departing from the concept of the invention are all within the scope of the invention.