56results about How to "Improve water delivery capacity" patented technology

The invention discloses self-lubricating modified light calcium carbonate filler which is prepared from the following raw materials in parts by weight: 2-3 parts of zinc stearate, 3-5 parts of polyoxyethylene, 0.5-0.7 part of inulin, 2-3 parts of graphite fluoride, 0.2-0.3 part of sodium potassium tartrate tetrahydrate, 0.1-0.2 part of sodium lignin sulfonate, 1-1.5 parts of nano crystalline cellulose, 0.5-0.8 part of benzotriazole, 1-1.5 parts of sulfo-diethylene glycol, 2-3 parts of butyl acrylate, 1-2 parts of a crylic acid, 0.4-0.5 part of poly(oxy-1,2-ethanediyl), 2-3 parts of nano zinc oxide, 0.1-0.2 part of ammonium persulfate, 80-85 parts of light calcium carbonate, 13-16 parts of aids and 120-140 parts of water. The filler disclosed by the invention is good in dispersibility; a modifier can form a uniform and integral coating layer on the surface of the nano calcium carbonate, so that the water delivery property of the surface of the calcium carbonate is good, and the strength and wear resistance of the surface of the calcium carbonate are increased; and due to addition of nano zinc oxide, the age resistance of PVC is increased.

The invention discloses a zinc negative electrode material of a zinc air cell and a preparation method for the zinc negative electrode material. The negative electrode material comprises metal zinc powder, zinc oxide powder, a binder, and a dual-functional additive with a one-dimensional tubular structure and formed by dual-layer metal oxide; the preparation method comprises the steps of adding the metal zinc powder, the zinc oxide powder, a conductive agent and the dual-functional additive into a binder-containing solution, performing ultrasonic dispersion processing, and heating and evaporating a solvent while stirring to obtain the zinc negative electrode material. The zinc negative electrode material is added with the dual-functional additive which can lower electrode internal resistance as well as supply a diffusion channel for an electrolyte, so that the discharging capacity and the rate capability of the cell can be improved; and meanwhile, a titanium dioxide inner layer has super-hydrophilic property and insulativity, so that the water delivery property of the electrolyte diffusion channel is forcefully enlarged, channel blocking is prevented, and the cycling life and the capacity stability of the cell are effectively prolonged and improved.

The invention discloses a nylon 66 / tackified polyester composite sheath core fiber and a preparation method thereof. The fiber comprises the following components by weight percent: 15-85% of nylon 66 and 85-15% of tackified polyester, wherein the nylon 66 serving as a sheath has a relative viscosity of 2.5-45.0% while the tackified polyester serving as a core has a relative viscosity of no less than 0.64%. The fracture strength of the fiber is no less than 3.6cN / dtex, the elongation at break thereof is no less than 80%, and the linear density thereof is 1.1-143dtex. The preparation method is as follows: compounding the nylon 66 into the sheath at the temperature of 300-310 DEG C and at the pressure of 5.0-35.0MPa, compounding the tackified polyester into the core at the temperature of 290-300 DEG C and at the pressure of 15-35.0MPa, and spinning, wherein the temperature, humidity and speed of cooling air are respectively15-28 DEG C, 75-100% and 0.8-2.5m / s, and the spinning speed is 400-1500m / s; drawing in an oil bath at the temperature of 50-90 DEG C, wherein the oil bath drawing times is 3.0-5.0; and drawing with steam at the temperature of 90-120 DEG C, wherein the steam drawing times is 1.1-1.5. The fiber can satisfy requirements on raw material fibers from customers like industrial woolen cloth, and greatly lowers the production cost.

The invention discloses a 5 / 2 power parabola-shaped open channel. A channel section shape of the open channel is a 5 / 2 power parabola shape and the opening of the open channel is upwards; a curve expression of a section of the 5 / 2 power parabola-shaped open channel is a formula (as shown in the specification), wherein the shape coefficient a is a formula (as shown in the specification), h is a water depth and B is a water surface width; an area of a water-carrying section of the channel is a formula (as shown in the specification); a wetted perimeter of the channel is a formula (as shown in the specification); and an optimum width to depth ratio of an optimum section of the open channel is a formula (as shown in the specification), wherein the shape coefficient a is a formula (as shown inthe specification), the normal water depth h is a formula (as shown in the specification), the critical water depth hc is a formula (as shown in the specification), the open area A is equal to 1.4916h2 and the wetted perimeter P is equal to 3.09633h. The 5 / 2 power parabola-shaped open channel is not only capable of improving the hydraulic characteristics of parabola-shaped sections, but also capable of improving the water carrying capacity.

The invention discloses an urban rainwater pipeline system capable of effectively supplementing underground water. The urban rainwater pipeline system includes a plurality of rainwater openings, filtering screens, rainwater connecting pipes and manholes which are quantitatively corresponding to the rainwater openings respectively, municipal rainwater pipes and filtering layers; each rainwater opening is provided with a first channel which is communicated with two ends of the rainwater opening; and each rainwater connecting pipe is provided with a second channel which is communicated with two ends of the rainwater connecting pipe; each municipal rainwater is provided with a third channel which is communicated with two ends of the municipal rainwater; the manholes are provided with cavities; the rainwater openings are connected with the rainwater connecting pipes; the first channels and the second channels are connected together so as to form channels which are communicated with the rainwater openings and the rainwater connecting pipes; the rainwater connecting pipes are connected with the manholes; the second channels are communicated with the cavities of the manholes; the manholes are connected with the municipal rainwater pipes; the cavities of the manholes are communicated with the third channels of the municipal rainwater pipes; the municipal rainwater pipes are provided with water seepage holes which are communicated with the interiors and the exteriors of the pipe walls of the municipal rainwater pipes; the exteriors of the municipal rainwater pipes are provided with the filtering layers; the filtering layers completely cover the water seepage holes; and the filtering screens are arranged at end portions of the rainwater connecting pipes, wherein the end portions of the rainwater connecting pipes are adjacent to the rainwater openings.

The invention discloses an irrigation system based on delivery automatic-control material, which relates to an irrigation system. The invention adopts a pump (20) to lay out irrigation pipe network in the soil (10); the terminal of the irrigation pipe network is communicated with water source (40) by a valve (30). The structure of the pipe (20) is that the cross section from the inside to outside is provided with an inner pipe (23), a frame (21) and an outer pipe (22) in sequence; the frame (21) is composed of permeable or semipermeable pipe; the outer pipe (22) is an outer delivery automatic-control pipe; the inner pipe (23) is normal hollow pipe or a conveyance pipe made of strongly permeable material. The invention, water transmission property of which can change according to the water content of plant soil, so as to save irrigation water, provide more proper environment for plant growth and is applicable to irrigation fields which relates to elivery automatic-control, such as agriculture, gardens, forestry practice, etc.

The invention relates to a fabricated culvert member and a construction method thereof. The fabricated culvert member comprises a base plate, a rib plate and an arc plate, wherein the rib plate is in a gantry shape and is fixed on both ends of the arc plate, the lower ends of the arc plate and the rib plate are fixed on the base plate, the three plates are integrated, and a space between the arc plate and the base plate is a drainage channel. The fabricated culvert member provided by the invention has the advantages of factory fabrication, field assembly, simple operation, guaranteed quality,quick construction speed, simple structure, reasonable force bearing, simple maintenance (installation, removal and replacement, good integrity, high strength, large adaptive deformation, no pollution, small environmental influence, practicability, economy and obvious effect, the maintenance of the culvert member saves 20-40% human resources, material resources and money less than that of common masonry pebble revetments, town bottom or buried circular pipe culverts, and the water utilization coefficient of the canal system can be greatly increased (evaporation and seepage are reduced).

The invention discloses an anti-seepage construction method for a channel of accumulation waterlogging wet land. The method comprises the first step of foundation treatment, the second step of channel bottom layer sand gravel cushion layer construction, the third step of channel bottom layer first building block construction, the fourth step of channel slope first building block construction, the fifth step of channel slope second building block construction, the sixth step of first building block construction area treatment and the seventh step of first building block construction area and second building block construction area flushing. First building blocks and second building blocks are adopted in the method for serving as a channel anti-seepage layer for construction, the single anti-seepage structure of the channel is converted into a composite structure, and the channel anti-seepage layer construction integrity and flatness are good; and the phenomena of water seepage and leakage of the channel are not likely to happen, the channel water conveying capability is improved, and the water conveying losses are reduced.

The invention belongs to the technical field of agricultural irrigation and particularly relates to a water-saving irrigation pipeline and a construction method thereof. The water-saving irrigation pipeline comprises a spodosol packing layer which is arranged in a foundation trench and a composite flexible pipe which is fixedly arranged in the spodosol packing layer, wherein the composite flexible pipe comprises a flexible pipe base layer, a PVC (Polyvinyl Chloride) coated layer and a PE (Poly Ethylene) thin-film layer from outside to inside. The construction method comprises the steps of material selection, foundation trench excavation, spodosol slotting, pipe laying, pipeline inspection, water-immersion compacting and the like. According to the water-saving irrigation pipeline, the problems such as pipeline breakage, water exclusion and operation difficulty which are brought by the structure and construction problems in the prior art are solved; the water-saving irrigation pipeline has the advantages of water-saving property, energy-saving property, land-saving property, simplicity and practicability in construction, short construction period and the like, and can be popularized in a large area, so that a new way is provided for saving water for the agriculture in China.

The invention discloses a water conveying tank for water conservancy project construction in the technical field of water conservancy projects. The water conveying tank comprises a water conveying tank body, wherein baffles are arranged in the middles of the inner walls of the left side and the right side of an inner cavity of the water conveying tank body; first sliding grooves are formed in the middles of the upper end faces of the baffles; rollers are evenly arranged in inner cavities of the first sliding grooves; connecting columns penetrate the centers of the end faces of the rollers; mounting plates are arranged on the upper end faces of the connecting columns; mounting boxes are arranged in the centers of the upper end faces of the mounting plates; servo motors are arranged in inner cavities of the mounting boxes; motor shafts of the servo motors penetrate the mounting plates to the lower end faces of the mounting plates; the lower end faces of the motor shafts of the servo motors are fixedly connected with threaded rods; the middles of the outer walls of the threaded rods are sleeved with sliding sleeves; and dredging devices are fixedly connected to the left sides and the right sides of the sliding sleeves. The device is simple in structure and convenient to operate, sludge in the water conveying tank is effectively removed, and the water conveying efficiency is improved.

The invention discloses a method of equivalent irrigation and pumping and recycling of geothermal energy for water delivery in ice age. Before freezing of open channel water in winter or when the water temperature needs to be increased, part of cold water in the open channel is recharged to an underground aquifer through an irrigation and pumping station, the water temperature is increased by using the geothermal energy, after the temperature is increased, the water in the underground aquifer which is equivalently pumped is mixed with the water in the original open channel, thus the water temperature in the open channel is increased, and it is guaranteed that the water surface of the open channel is not frozen for water delivery. One of the specific embodiments comprises the following processes that a numerical simulation model of geothermal energy water delivery in ice age is established; and the geothermal energy is used for water delivery in ice age. According to groundwater dynamics, under the combined action of a pumping well and an irrigation well, the water recharged to the aquifer moves towards the pumping well, and absorbs the geothermal energy along the way, the temperature is gradually increased until gets to the pumping well. Because the pumping and recharging amount are equal, the groundwater quality can be kept in balance, and the groundwater level is not lowered.

The invention relates to the technical field of design of biological channels, in particular to ecological type biological channels arranged in a concrete-lined channel in a subsection mode. A plurality of arrayed hollow bricks (20) are arranged on a side slope (1) in a subsection mode. Through holes are formed in each hollow brick. Inner hole soil (3) is arranged in each through hole. Inner hole vegetation (4) is arranged in the upper surface of each inner hole soil (3). The biological channels improve water-carrying capacity and water-carrying efficiency of a ditch system, enable living beings in an irrigation area to do activities, ensure that animals can conveniently go ashore or go off a ditch, improve biological diversity and ecological functions, and achieve perfect combination of safety, stability, landscape, naturality and hydrophilia.

The invention discloses a novel flat-bottom catenary open channel and a solving method of a hydraulic optimal section thereof. An opening of the flat-bottom catenary open channel is upward, and the section of the flat-bottom catenary open channel comprises a flat bottom and two catenary side edges which are positioned on two sides of the flat bottom and are smoothly connected with the flat bottom.The solving method comprises the following steps: designing the shape of the hydraulic section of the water conveying channel into a flat-bottom catenary section; establishing a solution model of thehydraulic optimal section of the flat-bottom curved open channel; solving the hydraulic optimal section of the flat-bottom catenary-shaped open channel; and solving the normal water depth and critical water depth of the hydraulic optimal section of the flat-bottom catenary open channel. The method has the advantages that the catenary section has no stress concentration point, and the open channelis not prone to have cracks caused by stress concentration. The open channel is small in leakage, good in stability, excellent in hydraulic characteristic, high in anti-freezing capacity and the like, also has the advantages of being flexible in flat-bottom section design, low in construction difficulty, easy to manage and maintain, easy to compact at the bottom and the like, and can improve thewater delivery efficiency, reduce the water delivery loss and reduce the construction cost.

The invention discloses a cofferdam island type foundation pit and method for canal lining repairing under the condition of uninterrupted water delivery. The cofferdam island type foundation pit and method are characterized in that a water canal (1) comprises a lining plate (2) arranged in the water delivery direction and inclined canal slopes (3) arranged symmetrically along with the lining plate (2); a cofferdam (4) is arranged on the water canal (1), the cofferdam (4) is located in the middle of the water canal (1), and the lower end of the cofferdam (4) and the canal slopes (3) are fixed together; the lower portion of the cofferdam (4) and the water canal (1) form a dry ground foundation pit (5); and the cofferdam (4) is of a module type buoyancy tank steel structure, and an air and water discharging structure (4.1) is arranged inside the cofferdam (4). The defect that a canal structure can be damaged by a cofferdam in the prior art is overcome. The cofferdam island type foundation pit and method have the advantages that the water head in the foundation pit is reduced greatly, and the uplift pressure borne by the lining in the foundation pit is reduced effectively.

The invention relates to a flower pot, in particular to a water storage and anti-waterlogging flower pot. The pot comprises a water storage base, a flower pot barrel body, an overflow assembly and a transplanting frame, the transplanting frame is rotatably connected to the upper end of the water storage base, the transplanting frame is disposed at the lower end of the flower pot barrel, and the overflow assembly is fixedly connected to the upper end of the outer side of the flower pot barrel. The flower pot can achieve the rotation of a flower during flower spray irrigation, save the labor cost of adjusting the flower orientation, and improve the efficiency of the flower orientation adjustment; excess water can be discharged through a plurality of overflow holes to avoid the loss of fertilizer caused by excessive irrigation, the overflow assembly has the filtering effect on overflowing water, and soil loss is avoided in the flower pot barrel; the transplanting frame can ensure good ventilation and water transfer effects in the flower growing period, and when plants need to be transplanted, the transplanting frame can remove the soil and flower from the flower pot barrel to solve the problem of root damage caused by transplanting through seeding pulling.

The invention discloses a reinforced plastics spiral tubular product of a composite steel strip, belonging to the field of steel and plastic tubular products. The reinforced plastics spiral tubular product is characterized in that a composite steel frame is used as a support, polyvinyl resin and a cold rolled steel strip which is subjected to oil and rust removal and is coated with adhesive resin are rolled into the steel frame with an approximate stair step shape through a cold forming sectional steel mill, and the steel frame is compounded and adhered with polyethylene to be made into a sectional bar for a steel and plastic structure pipe through a plastic extruder; and the reinforced plastics spiral tubular product of the composite steel strip is produced through helical winding and forming machine equipment by adopting a plastic resin melting mode.

The invention discloses a U-shaped wood-plastic canal lining and a manufacturing method thereof and belongs to the technical field of hydraulic engineering. The U-shaped wood-plastic canal lining is composed of stiffeners, U-shaped pot-shell-shaped single bodies and anchorage plate. The manufacturing method of the U-shaped wood-plastic canal lining comprises the following steps that (1), a cellulase modifier water solution is sprayed on a wood fiber powder material and talcum powder, and then drying is conducted; (2), the wood fiber powder material and the talcum powder are mixed; (3), polyolefin plastics, polyolefin elastomers (POE), an anti-ultraviolet agent and a compatilizer are mixed, and particle manufacturing is conducted; (4), a mixture of the step (2) is mixed with a particle material of the step (3), and a plasticized particle material is extruded out; and (5), the plasticized particle material is extruded or injected, and the U-shaped wood-plastic canal lining is manufactured. Compared with the prior art, the U-shaped wood-plastic canal lining has the advantages that the service life is long, the water conveying capacity is improved, the water-proof and leakage-proof properties are good, the anti-corrosion and anti-aging properties are good, the structure is simple, dismounting, mounting and conveying are convenient, and the environment-friendly effect is achieved.

The invention relates to a permeable hydraulic tunnel lining which is simple in design and structure, is low in cost and is excellent in durability, and accordingly relates to a manufacturing method for the permeable hydraulic tunnel lining. Through the method, in the condition of good surrounding rock integrity, the lining bears no surrounding rock pressure, water pressure in a hydraulic tunnel can penetrate the lining and directly act on the surrounding rock having good integrity, and the lining does not have to bear the water pressure; the roughness of the hydraulic tunnel can be effectively decreased, the water-carrying capacity of the hydraulic tunnel can be improved, and the method has an actual engineering application value; and through FRP fiber bundles introduced in a manufacturing process, the problems of the durability of a reinforced concrete structure, such as corrosion of steel bars, can be avoided.

The invention provides a drag-reducing and roughness-reducing method for concrete surface coating of a water delivery building. The drag-reducing and roughness-reducing method comprises the followingsteps: (1) treating a substrate; and polishing and filling the concrete surface of a panel on the upstream face; (2) brushing a base coat interface agent; (3) brushing SK scraping polyurea; and (4) maintaining SK scraping polyurea. According to the drag-reducing and roughness-reducing method, roughness reducing coating series materials suitable for an aqueduct structure and different environmentalconditions are used, a construction process and a quality control standard are established in a matched mode, the aqueduct roughness coefficient can be decreased by 20% or above, the water delivery capacity can be improved by 25% or above, and reinforcing transformation and dismantling reconstruction are avoided. Technical surpassing of concrete disease elimination, durability improvement, roughness reduction and flow increase of an old water delivery building is achieved at a time.

An ecological and efficient facility for an irrigation channel of a rice field comprises a channel and an ancillary building, wherein the cross section of the channel adopts a U shape, and the bottom of the channel is lower than the field surface; the ancillary building comprises a water irrigation groove, a water irrigation gate, ecological boards and check gates; the water irrigation groove is located at the side edge of the channel in the middle of each irrigation cell, and the bottom of the water irrigation groove is as high as the field surface; the water irrigation gate is a wedge type flashboard gate valve, is located in the water irrigation tank and is tightly close to the upper edge of the channel; a corrugated board is arranged on one surface of each ecological board, the ecological boards are sectioned and lean against the bottom and the upper edge of the channel in an intersected manner, and the corrugated surfaces face upwards; and the check gates are wedge type flashboard gate valves and are sectioned and arranged in the channel. With the adoption of the ecological and efficient facility for the irrigation channel of the rice field, water resources can be efficiently utilized, irrigation efficiency, labor productivity and ecological benefits can be improved, the cultivated land can be saved, and the ecological and efficient facility is low in construction costs and maintenance cost, firm, durable and simple to operate and maintain, thereby facilitating large-area popularization and application.

The invention provides a turbulence anti-clogging dripper which is provided with double tooth-shaped flow passages; water flowing into the dripper enters a water outlet groove through the double tooth-shaped flow passages respectively, and converges in the water outlet groove to form a vortex, so that the turbulence effect is enhanced, and the anti-clogging performance of the dripper is improved; as each tooth-shaped flow passage comprises long teeth and short teeth, the tooth-shaped flow passage is widened to the most extent on the premise of ensuring energy dissipation by turbulence, and the water-carrying capacity and the anti-clogging performance of the dripper are greatly improved; a plurality of lacing wires are arranged on the back side of a dripper body, so that a hollowed out structure is formed, the weight of the turbulence anti-clogging dripper is greatly reduced, and the production cost is reduced; the structure is simple, and the turbulence anti-clogging dripper is convenient to use.

The invention discloses a double-layer steel-strip-reinforced plastic spiral tube, which belongs to the field of steel plastic tubes, and is characterized in that: a steel skeleton is used for support; the step steel skeleton is formed by using polyvinyl resin and a cold-formed steel strip, which is deoiled and derusted and coated with adhesive resin, and by rolling in a cold formed profile steel machine; the steel skeleton and the polyvinyl resin are adhered together in a plastic extruder to form a steel plastic tube profile; and finally, the double-layer steel-strip-reinforced plastic spiral tube is manufactured by a spiral winding forming machine and a plastic-resin melting mode.

The invention relates to the technical field of water supply equipment, in particular to a water supply device with an anti-clogging function, comprising a water tank main body, a water inlet pipe is plugged into the upper surface of the water tank main body of the water tank main body, and the inner wall of the water tank main body is connected from the top A fixed block and a limiting plate are respectively fixedly connected to the bottom, the inside of the limiting plate is fixedly connected with an air bag, the lower surface of the main body of the water tank is plugged with a water outlet pipe, and the inside of the main body of the water tank is movably connected with a The impeller moves to both sides through the shielding plate, so that the internal space of the main body of the water tank becomes larger, thereby reducing the flow rate of water inside the main body of the water tank, thereby avoiding the waste of water resources caused by excessive water flow, so that water resources can be used reasonably. The water flows through both sides of the deflector, so as to play the role of dredging water, avoiding the accumulation of sundries in the water to block the water pipe, so as to make the water flow more smoothly, and at the same time improve the water delivery effect of the equipment.

The invention relates to a production process of anti-pilling dry-process acrylic fibers and belongs to the technical field of dry-process acrylic fibers. The production process is characterized in that dry-process acrylic fiber tows after drying are drafted by a seven-roll drafting device, and the drafted dry-process acrylic fiber tows are subjected to tension heat setting at 130 DEG C to 160 DEGC and then are subjected to relaxation heat setting in 0.10 MPa to 0.16 MPa steam for 1 min to 3 mins to obtain the dry-process acrylic fibers. By using a seven-roll drafting method, selecting a suitable drafting multiple and adjusting the fiber drafting, heat setting process and equipment, the product of the knotting strength and knotting elongation of the fibers is <=35, and the boiling water shrinkage of the fibers is <4. %. The products of the production process achieve an anti-pilling effect, are adapted to the needs of the market, greatly increase the added value of dry-process acrylicfibers, and promote the entry of dry-process acrylic fibers into high-grade textile products.

The invention belongs to the technical field of agricultural irrigation and particularly relates to a water-saving irrigation pipeline and a construction method thereof. The water-saving irrigation pipeline comprises a spodosol packing layer which is arranged in a foundation trench and a composite flexible pipe which is fixedly arranged in the spodosol packing layer, wherein the composite flexible pipe comprises a flexible pipe base layer, a PVC (Polyvinyl Chloride) coated layer and a PE (Poly Ethylene) thin-film layer from outside to inside. The construction method comprises the steps of material selection, foundation trench excavation, spodosol slotting, pipe laying, pipeline inspection, water-immersion compacting and the like. According to the water-saving irrigation pipeline, the problems such as pipeline breakage, water exclusion and operation difficulty which are brought by the structure and construction problems in the prior art are solved; the water-saving irrigation pipeline has the advantages of water-saving property, energy-saving property, land-saving property, simplicity and practicability in construction, short construction period and the like, and can be popularized in a large area, so that a new way is provided for saving water for the agriculture in China.

The invention discloses a nylon 66 / tackified polyester composite sheath core fiber and a preparation method thereof. The fiber comprises the following components by weight percent: 15-85% of nylon 66 and 85-15% of tackified polyester, wherein the nylon 66 serving as a sheath has a relative viscosity of 2.5-45.0% while the tackified polyester serving as a core has a relative viscosity of no less than 0.64%. The fracture strength of the fiber is no less than 3.6cN / dtex, the elongation at break thereof is no less than 80%, and the linear density thereof is 1.1-143dtex. The preparation method is as follows: compounding the nylon 66 into the sheath at the temperature of 300-310 DEG C and at the pressure of 5.0-35.0MPa, compounding the tackified polyester into the core at the temperature of 290-300 DEG C and at the pressure of 15-35.0MPa, and spinning, wherein the temperature, humidity and speed of cooling air are respectively15-28 DEG C, 75-100% and 0.8-2.5m / s, and the spinning speed is 400-1500m / s; drawing in an oil bath at the temperature of 50-90 DEG C, wherein the oil bath drawing times is 3.0-5.0; and drawing with steam at the temperature of 90-120 DEG C, wherein the steam drawingtimes is 1.1-1.5. The fiber can satisfy requirements on raw material fibers from customers like industrial woolen cloth, and greatly lowers the production cost.

The invention discloses a cofferdam island type foundation pit and a construction method under the condition of channel lining repair without interruption of water delivery, and is characterized in that: the water channel (1) includes a lining board (2) laid along the water delivery direction and a The lining board (2) is symmetrically arranged with an inclined slope (3); a cofferdam (4) is arranged on the water channel (1), and the cofferdam (4) is located in the water channel (1) The middle part and the lower end are fixed together with the canal slope (3); the bottom of the cofferdam (4) forms a dry foundation pit (5) with the water channel (1), and the cofferdam (4) is The steel structure of the modular buoyancy box is provided with an exhaust and drainage structure (4.1) inside the cofferdam (4), which overcomes the disadvantage that the cofferdam in the prior art will cause damage to the channel structure, and has the ability to greatly reduce the foundation The water head in the pit can effectively reduce the uplift pressure on the inner lining of the foundation pit.

The invention discloses an anti-seepage construction method for a channel of accumulation waterlogging wet land. The method comprises the first step of foundation treatment, the second step of channel bottom layer sand gravel cushion layer construction, the third step of channel bottom layer first building block construction, the fourth step of channel slope first building block construction, the fifth step of channel slope second building block construction, the sixth step of first building block construction area treatment and the seventh step of first building block construction area and second building block construction area flushing. First building blocks and second building blocks are adopted in the method for serving as a channel anti-seepage layer for construction, the single anti-seepage structure of the channel is converted into a composite structure, and the channel anti-seepage layer construction integrity and flatness are good; and the phenomena of water seepage and leakage of the channel are not likely to happen, the channel water conveying capability is improved, and the water conveying losses are reduced.

The invention provides a pier tail structure of a double-conveyance aqueduct. The pier tail structure comprises a narrow tail pier, a middle partition wall, an aqueduct left ditch, an aqueduct right ditch, an open channel gradual-changing section. The aqueduct left ditch and the aqueduct right ditch are disposed with the central line of the middle partition wall as the symmetry axis. The tail endof the middle partition wall is connected with the narrow tail pier. The narrow tail pier is disposed with the central line of the middle partition wall as the symmetry axis. The middle partition wall, the narrow tail pier and the open channel gradual-changing section are all disposed with the central line of the middle partition wall as the symmetry axis. The widths from the head end to the tailend of the narrow tail pier gradually decrease, so that separation of water flow boundary layers attached to the left and right side walls of the narrow tail pier becomes slow. Compared with a traditional dual-conveyance aqueduct pier tail structure, the pier tail structure can prevent water flow from fluctuating drastically during aqueduct water conveyance, improve stress characteristics of the aqueduct structure and improve the water conveyance capacity of the aqueduct, and has guidance significance in designing the dual-conveyance aqueduct during a water diversion project.