42results about "Gravity dams" patented technology

The present application belongs to the technical field of mass concrete construction, and aims to solve the problem of high thermal resistance and slow heat dissipation of traditional cooling pipe laminar bottom layer, and discloses a gravity dam construction cooling water pipe based on destruction of laminar bottom layer and a method thereof. The cooling water pipe comprises a plurality of series water pipe units, each water pipe unit comprises a steel pipe, a flexible spring hose is arranged in the steel pipe, and the spring hose forms a spiral protruding turbulence structure along the inner wall of the steel pipe; the hose is fixed by pointwise anchoring and outer wall surface bonding with glue, and a ring is arranged at both ends for limiting and assisting turbulence. The present application breaks through the thermal resistance of laminar bottom layer, greatly improves the hydration heat conduction efficiency, is convenient to construct and has durable structure, and is suitable for mass concrete temperature control requirements.

The invention belongs to the technical field of gravity dam construction, and provides an assembled concrete cooling pipe structure and method for gravity dam construction. The cooling pipe is composed of a plurality of pipe body units connected in series, and lining pieces are arranged in metal pipes of the pipe body units. The lining piece and the elastic steel sheets form a criss-cross cage type structure through the strip-shaped plates, the strip-shaped plates are provided with pitted surfaces and notches, the steel sheets can stretch out and draw back to achieve variable-diameter adjustment, and water flow can be forced to generate turbulent flow to damage the laminar flow bottom layer. The method comprises the steps of raw material pretreatment, notch and pitted surface machining, lining piece assembling, metal pipe assembling and fixing and pipe body unit series connection. The structure is stable, manufacturing is convenient, boundary layer thermal resistance can be reduced, heat transfer efficiency is improved, concrete temperature cracks are reduced, and the gravity dam construction requirement is met.

The invention provides a digital twin hydraulic engineering operation and maintenance monitoring system and method based on multi-modal data, and belongs to the technical field of hydraulic engineering and digital twin. The method comprises the following steps: determining a plurality of sub-unit systems of a target water conservancy project to be monitored, and constructing a corresponding digital twin sub-model for each sub-unit system to obtain a digital twin engineering model of the target water conservancy project; acquiring multi-modal historical monitoring data related to the target water conservancy project; based on the multi-modal data, determining a construction environment of a digital twinborn model; mapping each digital twinning sub-model to a construction environment, and running a digital twinning engineering model; and acquiring multi-modal real-time monitoring data related to the target water conservancy project in real time, inputting the multi-modal real-time monitoring data into the digital twin engineering model, and performing operation and maintenance monitoring on the target water conservancy project. According to the method, the rigid-flexible container adaptive model is adopted, so that the cloud resource calling cost can be reduced while the visual operation and maintenance of the water conservancy project are realized and the monitoring efficiency and accuracy are improved.

The invention discloses a concrete gravity dam structure with a cavity and a construction method thereof, and belongs to the technical field of water conservancy and hydropower engineering. The structure comprises a dam body, an anti-sliding structure, a weight reduction cavity and a gallery structure. The dam body is composed of a dam foundation arranged in the rock mass and a dam body poured on the dam foundation. The anti-sliding structure is a concrete anti-sliding plug which is formed at the bottom of the dam foundation and embedded into the bedrock. The weight reduction cavity is formed in the dam body in the axis direction of the dam. The gallery structure comprises a plurality of galleries arranged along the axis of the dam, a dam foundation grouting curtain is arranged at the bottom of the upstream gallery, and drainage structures are arranged in the galleries. By arranging the cavity in the dam and the steep dam slope, the using amount of concrete can be obviously reduced; an anti-sliding plug is used for providing passive anti-sliding force instead of resisting sliding force through dam foundation anti-sliding force generated between the self weight of a common gravity dam and a dam foundation rock mass, and meanwhile, a pre-stressed anchor cable constructed from a corridor is used for actively reinforcing and adjusting pre-tightening force so as to regulate and control dam foundation stress, so that the requirement of the dam foundation stress is met; seepage is controlled by combining a curtain and a drainage system. On the premise that the safety and stability of the dam body are guaranteed, the construction cost is effectively reduced, and remarkable economical efficiency and technical advantages are achieved.

The layered water taking system based on the gravity dam comprises a vertical shaft, three vertical shaft type water taking openings are sequentially formed in one side of the upstream of the vertical shaft, the three vertical shaft type water taking openings are arranged according to the dead water level and the normal water storage level elevation of a reservoir, and the three vertical shaft type water taking openings are each provided with an overhauling mechanism. The layered water taking system based on the gravity dam solves the problems that an existing conventional maintenance system of the gravity dam depends on a single valve form, when a valve breaks down, a reservoir needs to be emptied for maintenance, and water taking continuity is seriously affected, and later maintenance is facilitated.

The invention provides a fishway and dam integrated device integrating multi-depth entrances and exits and multi-direction water replenishing and fish luring and an operation method, and belongs to the technical field of fishways. The device comprises a gravity dam section, a stepped fishway integrated in the gravity dam section and a water replenishing pipeline pre-buried in a wall body of the gravity dam section; the upstream side and the downstream side of the gravity dam section are provided with multi-elevation entrances and exits and matched gates respectively, a fishway bottom plate and partition plates of the stepped fishway are distributed in a stepped mode, and the water supplementing pipeline is provided with multi-direction water supplementing sprayers around the fishway entrance. According to the operation method, through cooperative opening and closing of multi-depth inlets and outlets, multi-direction and multi-flow-speed fine regulation and control of water supplementing nozzles, stepped fishway energy dissipation and flow aiding and dam water retaining mode switching, fishway and dam structure function integration is achieved. Extra land acquisition and pouring are not needed, the engineering cost and construction difficulty are reduced, the method can adapt to dynamic changes of the water level of the reservoir, migration depth preferences of different fishes are considered, the fish luring and passing efficiency is improved, and the fish passing window period is prolonged.

The application discloses a method for precisely controlling construction quality of a roller compacted concrete interlayer, which comprises the following steps: S1, roller compacted concrete test preparation, determining a test site and a roller compacted concrete test block size, and dividing areas of the test block; S2, a roller test process, layer-by-layer rolling of the test block, and obtaining maturity results of different interlayer joints of the test block; S3, curing and coring of the roller compacted concrete test block, and obtaining test result data of the core sample; S4, analyzing tensile and compressive results of the core sample, and obtaining analysis conclusions of the tensile and compressive results of the sample; S5, according to S2 to S4, formulating control standards and treatment measures of the roller compacted concrete interlayer joints in different months; S6, in a roller compacted concrete dam construction process, corresponding treatment measures are carried out according to the control standards and treatment measures of the roller compacted concrete interlayer joints in different months; and S7, after the roller compacted concrete dam construction is completed, construction quality is checked and results are verified. The application can improve pouring quality of the roller compacted concrete.

The application belongs to the technical field of gravity dam construction, and proposes an assembled concrete cooling pipe structure and method for gravity dam construction. The cooling pipe is composed of a plurality of series-connected pipe body units, and a metal pipe of the pipe body unit is provided with an inner lining piece; the inner lining piece forms a longitudinal and transverse interlaced cage structure through a strip-shaped plate and an elastic steel sheet, the strip-shaped plate is provided with a rough surface and a notch, the steel sheet can be stretched and contracted to realize diameter adjustment, and can forcibly generate turbulent flow to destroy the laminar flow bottom layer. The method includes raw material pretreatment, notch and rough surface processing, inner lining piece assembly, metal pipe assembly and fixation, and pipe body unit series connection. The application has stable structure, convenient manufacturing, can reduce the boundary layer thermal resistance, improve the heat transfer efficiency, reduce the concrete temperature cracks, and is suitable for the construction requirements of gravity dam.

The application provides a dike reinforcing structure and a construction method thereof. The dike reinforcing structure is characterized by the following steps: setting a left reinforcing column and a right reinforcing column to support the dike structure; setting a first left pad plate, a first right pad plate and a horizontal steel plate to form a U-shaped fixing groove in cooperation with a first vertical plate and a second vertical plate; setting a reinforcing steel plate in the U-shaped fixing groove; and reinforcing the reinforcing steel plate by using a left reinforcing rod and a right reinforcing rod to form a stable dike reinforcing system.

The utility model provides a kind of support platform for dam body bracket concrete construction, belong to dam reinforcement construction technical field, comprising: concrete thickening layer, steel formwork, triangular support frame, adjustable support piece.The utility model, by design concrete thickening layer, steel formwork, triangular support frame and adjustable support piece, concrete thickening layer improves the strength of concrete gravity dam to some extent, and provides the basis for the installation of steel formwork, avoid the damage caused by direct anchoring on original dam body, moreover, the height of steel formwork, triangular support frame design is lower than the bracket bottom mould of pre-pouring reinforced bracket, and adjustable support piece is used to support the bracket bottom mould of pre-pouring reinforced bracket, when disassembling the bracket bottom mould of pre-pouring reinforced bracket in later period, it is very convenient, and triangular support frame forms processing platform, processing platform is used as construction operation passageway, for personnel walking and temporary storage of light material and tool, guarantee the safe operation of construction personnel.

This invention proposes a method for treating seepage in transverse joints of concrete gravity dams, belonging to the field of water conservancy and hydropower engineering. The method includes the following steps: First, a first composite seepage interception layer is constructed at the transverse joint on the upstream dam face. This first composite seepage interception layer consists of a plastic water-stopping material embedded in the U-shaped groove of the transverse joint and a polyurea elastic coating covering the dam face and the transverse joint. Second, a second elastic water-stopping seepage barrier is constructed between the two water-stops at the dam crest. This second elastic water-stopping seepage barrier consists of a water-soluble polyurethane grout solidified and injected into boreholes along the joint. Third, a third drainage channel is constructed downstream of the second water-stop. This third drainage channel consists of drainage holes along the joint that penetrate the transverse joint to the lower gallery. This invention adopts a three-in-one technical concept of "interception-blocking-drainage." The upstream dam face intercepts and prevents reservoir water from directly entering the joint surface; the middle water-stop seals the seepage channels inside the transverse joint; and the downstream drainage holes drain residual seepage from the transverse joint. These three lines of defense work together to form a complete and reliable seepage prevention system.

The invention discloses a finite element analysis method for reducing concrete tensile stress through a transverse joint grouting measure. Comprising the following steps that a concrete gravity dam discharge dam section and foundation model is established, finite element software is imported, and numerical simulation parameters are set; grid division is carried out on the model, and grids in the runner are encrypted; constraint and load are applied, elastic support is applied to the side surface of the dam section, and transverse joint grouting measures are simulated; and solving the model by using finite element software, and evaluating stress results of an inlet section, a gate slot section and a breast wall section of the discharge dam section. The device has the advantages that elastic support is applied to the side surface of the dam section, and the effect of transverse joint grouting measures on the dam section is simulated. Quantitative calculation results show that transverse joint grouting measures can increase the lateral rigidity of the dam section, improve the stress state of concrete and reduce the tensile stress of the concrete in the flow channel, so that the use amount of steel bars in the flow channel is reduced, and the method is safe, economical and convenient to construct.

A high-pressure jet grouting construction method for a concrete cutoff wall for a dam, comprising the following steps: S1, determining a cutoff wall method; S2, determining a cutoff wall location; S3, optimizing a cutoff wall construction procedure; and S4, performing cutoff wall joint treatment. The construction method employs a series of operations to determine whether a cutoff wall method is feasible; extending a seepage path to reduce a hydraulic gradient when the hydraulic gradient does not meet requirements; optimizing a cutoff wall location by moving the cutoff wall to an upstream side of a dam body; constructing the dam body and the cutoff wall at the same time without mutual interference to accelerate construction progress; and performing cutoff wall cap casting before constructing the high-pressure jet grouting cutoff wall, thereby saving time spent on working platform excavation and secondary backfill, saving construction costs, and reducing the duration of construction.

In a method for relieving the pressure on a main dam (1) of a dam assembly (13), wherein the dam assembly (13) comprises a main dam (1) for impounding a reservoir, a relief wall (5) is constructed downstream of the main dam (1), which has a lower height than the main dam (1), wherein a relief lake (6) is formed between the main dam (1) and the relief wall (5) such that the resulting hydrostatic pressure forces on the main dam (1) are reduced.

The invention relates to the technical field of construction of roller compacted concrete gravity dams in water conservancy and hydropower engineering, in particular to a construction method for continuous multi-dam-section rapid pouring of dam foundation cushion layer concrete of a roller compacted concrete dam. According to dam foundation cushion concrete, by means of measures of building a road in advance, directly replacing traditional bamboo plywood with asphalt cedarwood boards for formworks and the like, the situation that in the conventional pouring process, damage and pollution are caused to a dam section foundation surface due to the fact that an automobile enters a warehouse through adjacent dam sections, and then the foundation surface is cleaned repeatedly is reduced; compared with the tedious procedures of one-bin cleaning, one-bin checking and accepting, one-bin pouring and one-bin re-cleaning circulation in the prior art, the pouring efficiency of the low-slump distorted concrete of the dam foundation cushion layers of the adjacent dam sections is greatly improved, and the rapid and continuous pouring construction method is formed.

The invention provides a steel-concrete combined member for multi-layer continuous pouring of mass concrete and a construction method.The steel-concrete combined member comprises a top-heightened overhanging main body structure arranged on an original concrete foundation on the top of a poured part of a dam, and the overhanging main body structure comprises a disassembly-free steel structure supporting member; the steel structure supporting component comprises a plurality of profile steel components, each profile steel component is provided with an inclined section, and the inclined sections extend out of an original concrete foundation on the top of the poured part of the dam. A plurality of T-shaped reinforced concrete precast blocks are obliquely laid between the inclined sections of every two adjacent profile steel members, the end faces of the heads of the T-shaped reinforced concrete precast blocks jointly form a formwork face, the handle portions of the T-shaped reinforced concrete precast blocks are inserted between the inclined sections from the inner sides of the profile steel members, and concrete is poured on the formwork faces; and the top surface of the overhanging main body structure is set as a construction foundation surface of the overhanging heightening structure. The construction risk of template mounting and dismounting can be reduced, the labor cost is reduced, and the construction time is shortened.

The present application relates to a gravity dam reinforcement anti-seepage structure, belonging to the technical field of reinforcement of hydraulic engineering structures. The structure aims at the problems of poor synergy between the anti-seepage layer and the structural reinforcement layer, great difficulty in high-altitude operation and insufficient deformation adaptability in the existing gravity dam reinforcement method. A composite reinforcement system is formed by sequentially arranging cast-in-place reinforced concrete bases, multiple concrete precast panels, cast-in-place concrete strips and multiple concrete precast panels in front of the original dam body. The precast panels are connected to the dam body through fixed anchor bars, and composite aluminum foil adhesive tape is pasted at the joint between adjacent panels. The cavity between the panels and the dam body is filled with poured asphalt concrete to form a continuous anti-seepage layer. At the same time, closed-cell foam boards and copper sheets are arranged in the structural joints between the cast-in-place concrete strips and the asphalt concrete layer to adapt to deformation. The structure is mainly used for reinforcement and anti-seepage treatment of existing gravity dams, and can effectively improve the integrity and anti-seepage reliability of the dam body.

The invention provides a high-cold high-altitude gravity dam mass concrete hydration heat cooling method which comprises the steps that cooling pipe networks are arranged inside and on the outer surface of concrete respectively, and multi-dimensional sensing data are collected; extracting features to obtain structured feature data; constructing a dual-network structure model, and predicting concrete internal hydration heat distribution and temperature gradient change in real time by using an evaluation network; generating an adaptive cooling strategy by using the control network; controlling the pipe network valve and pump station power, and dynamically adjusting the cooling process; continuously collecting data, and combining model output to perform real-time feedback optimization and update model parameters. According to the method, accurate dynamic regulation and control of concrete hydration heat and temperature gradient are achieved by collecting data, building a model and combining evaluation network prediction and control network strategies, the defects of a traditional method are overcome, the early cracking rate of mass concrete of a high-cold and high-altitude gravity dam is reduced, it is ensured that the model adapts to environmental sudden change through a feedback optimization mechanism, and the early cracking rate of mass concrete of the high-cold and high-altitude gravity dam is improved. And the structural durability and the temperature control anti-cracking effect are improved.

According to the protection structure for dam body top stockpiling construction, a stand column is fixed to the whole slope of a dam body, a mounting plate is rotatably hinged to the stand column, and the bottom face of the mounting plate makes friction contact with the dam body; and the top surface of the mounting plate is provided with a hole in which a rigid mounting rod is mounted in an interference manner. A plurality of damping columns are fixed to the tops of the rigid mounting rods, the multiple damping columns are correspondingly mounted on the top face of the mounting plate through the rigid mounting rods, and the elastic deformation of the damping columns is different. A protective net is fixedly installed on the outer side, away from the dam body slope, of the stand column. The damping columns with different elastic deformation amounts generate different damping to provide damping buffering or blocking for impact or jumping of the falling rocks, then the falling rocks losing impact or jumping are blocked by the protective net, and the problem that the falling rocks are impacted or jumped when rolling down from the dam body face and are prone to breaking through the protective net is solved.

The invention discloses a roller compacted concrete dam interlayer combination construction method, which relates to the technical field of dam interlayer combination construction, and comprises the steps of interlayer joint maturity judgment, cold joint pretreatment, slurry adding treatment and roller compacted concrete paving. Dividing a hot seam, a warm seam and a cold seam by calculating the correction maturity (the integral of environment temperature and exposure time), wherein the hot seam is free from treatment, the warm seam is directly added with slurry, the cold seam is flushed by a high-pressure water gun (the pressure is greater than or equal to 15MPa, and the aggregate exposure rate is greater than or equal to 80%), and slurry is added after cleaning; 42.5 ordinary Portland cement is adopted for preparing cement paste with the water-binder ratio of 0.55-0.65, 8-12 kg / m of cement paste is sprayed, and paving (the uniformity error is smaller than or equal to + / -5%) and rolling (the number of times is larger than or equal to 8) of the next layer are completed within 3 hours; the method is standard in process, easy and convenient to operate, capable of remarkably improving interlayer bonding strength and dam impermeability and saving construction cost, suitable for roller compacted concrete gravity dams and particularly suitable for complex working conditions such as long-time construction joints and inclined warehousing roads.

The present application relates to the technical field of hydraulic engineering, and discloses a method for rapid construction of a rock-fill self-compacting concrete gravity dam, comprising the following steps: S1, treatment of a bedrock surface and preparation of a cleaning site, and pouring of a concrete cushion after the treatment of the bedrock surface is completed; S2, installation of a formwork; S3, screening and storage of rockfills; S4, production and transportation of self-compacting concrete; S5, pouring of the self-compacting concrete; S6, maintenance of the self-compacting rock-fill concrete; and S7, checking of the safety performance of the stepped gravity dam body by means of a numerical simulation method and a rigid body limit equilibrium method. The technical scheme of the present application can reduce the risk of safe operation and construction cost, and improve the construction efficiency and shorten the construction period.

The application relates to the technical field of hydraulic engineering, in particular to an insertion joint structure for a mixed dam. The insertion joint structure comprises a connecting section for connecting a face dam and a gravity dam; the connecting section is integrally formed with the face dam, one end of the connecting section is provided with an insertion slot for the gravity dam; and a water stop assembly is further arranged in the connecting section. In the insertion joint structure for the mixed dam, the movement of a flexible water stop block is controlled by flowable fillings, when water seeps, the flowable fillings originally blocking the flexible water stop block are washed away by the impact force of water flow, and the flexible water stop block is pushed to move to the end of the gravity dam by the water pressure on the upstream side, so that temporary water stopping at the connecting position of the gravity dam and the connecting section is realized, the workload of repair work is reduced, and the water stopping efficiency is improved.

The utility model provides a concrete gravity dam overflow surface construction platform belongs to construction platform technical field, include: construction platform and steel ladder structure. The utility model discloses, through the longitudinal design construction platform on the overflow surface of concrete gravity dam, supplies the walking of construction personnel and small -size mechanical equipment, thereby avoids the cumbersome procedure of personnel passing through dam top, and designs steel ladder structure, and the personnel walk on the overflow surface of concrete gravity dam is convenient.

The invention discloses a design method for reducing concrete tensile stress by adjusting a water stop position, and particularly relates to a design method for effectively reducing the tensile stress in a flow channel of a concrete gravity dam by reasonably adjusting water stop arrangement. Comprising the following steps that a concrete gravity dam discharge dam section and foundation model is established, finite element software is imported, and numerical simulation parameters are set; grid division is carried out on the model, and grids in the runner are encrypted; constraint and load are applied to the target analysis dam section, the water stop position of the side face of the target analysis dam section is adjusted, hydrostatic pressure is applied, and a reasonable water stop arrangement type is achieved through repeated adjustment; and solving the model by using finite element software, and evaluating a stress result in the flow channel of the discharge dam section. The hydrostatic pressure is applied to the side surface of the dam section to simulate the influence on the stress of the dam section after the water stop position is adjusted. The design method shows that the tensile stress in the concrete gravity dam flow channel can be reduced by adjusting the water stop position, and therefore the use amount of steel bars is reduced.

The present application belongs to the technical field of water conservancy and hydropower engineering construction, and particularly relates to a plugging gate mechanism for a gravity dam diversion bottom hole and a construction method. The plugging gate mechanism is composed of a gravity dam diversion bottom hole, a supporting bottom plate, a planar door plate, an upper support and a lower support. The construction of the plugging gate is completed through nine steps of supporting bottom plate foundation construction, supporting bottom plate construction, installation of a slide, planar door plate construction, upper support construction, lower support construction, waterproof structure construction, plugging gate closing construction and cover weight construction. The present application does not need to specially set a gate chamber and a steel gate, greatly saving investment. The present application does not need to set a hoist and a power supply, and realizes gate closing through the structure self-weight. The present application adjusts the gate closing speed through the setting of a soft support, effectively protecting the safety of the structure.

The invention relates to a gravity dam danger removing and reinforcing anti-seepage structure, and belongs to the technical field of danger removing and reinforcing of hydraulic engineering buildings. The structure aims at solving the problems that in an existing gravity dam reinforcing method, an impermeable layer and a structure reinforcing layer are poor in collaboration, high-altitude operation difficulty is large, and deformation adaptability is insufficient. A cast-in-place reinforced concrete base, a plurality of concrete prefabricated hanging plates, a cast-in-place concrete strip and a plurality of concrete prefabricated hanging plates are sequentially arranged in front of an original dam body to form a composite reinforcing system, the prefabricated hanging plates are connected with the dam body through fixing anchor bars, and a composite aluminum foil adhesive tape is pasted to the joint of every two adjacent hanging plates. A cavity between the hanging plate and the dam body is filled with pouring type asphalt concrete to form a continuous impermeable layer, and meanwhile, a closed-cell foam plate and a water stop copper sheet are arranged in a structural joint between the cast-in-place concrete strip and the asphalt concrete layer to adapt to deformation. The structure is mainly used for danger removal, reinforcement and anti-seepage treatment of the existing gravity dam, and the integrity and the anti-seepage reliability of the dam body can be effectively improved.

This utility model discloses a roller-compacted concrete gravity dam joint cutting construction device, comprising: a backhoe body providing walking and power support; a cutting head installed at the end of the backhoe arm of the backhoe body, the width of the cutting head matching the designed width of the dam joint; a guiding and positioning device located on both sides of the cutting head, including a laser rangefinder and a hydraulic correction system. The laser rangefinder is fixed to the front end of the backhoe arm through a fixing box, and the laser line emitted by it is projected onto the ground to form a guiding reference. The hydraulic correction system adjusts the cutting trajectory of the cutting head according to the laser signal; and a tarpaulin laying control system integrated behind the cutting head, including a tarpaulin roll, a tensioning device, and a pressing roller. The tarpaulin roll is installed on the rear side of the cutting head, the tensioning device is connected to the hydraulic circuit, and the pressing roller is linked to the lifting action of the cutting head through a synchronous linkage to realize the pressing and fixing of the tarpaulin. Cutting and tarpaulin installation are completed using the same equipment, resulting in higher efficiency.

The invention discloses a concrete anti-seepage wall and mass concrete joint structure which comprises a first-stage anti-seepage wall connected with mass concrete and a second-stage anti-seepage wall connected to the end of the first-stage anti-seepage wall, the second-stage anti-seepage wall is formed after the first-stage anti-seepage wall is poured, and the first-stage anti-seepage wall comprises a gradual change part and an arc-shaped part. The gradual change part is of an isosceles trapezoid structure, the second-stage diaphragm wall is arranged at the small-size end of the gradual change part, and the arc-shaped part is arranged at the large-size end of the gradual change part. On the basis that the integrity of an anti-seepage system and the stability of the structure are fully considered, the joint structure of the concrete anti-seepage wall and the mass concrete is easy to construct, economical, reasonable, safe and effective, and the joint structure can be well suitable for a concrete gravity dam on a deep covering layer; and the reliability of the joint of the concrete diaphragm wall and the concrete gravity dam is ensured.

The application discloses a kind of high-cold high-altitude gravity dam cantilever bracket concrete anti-cracking construction methods, belong to the technical field of hydropower engineering construction.The method is based on pre-embedded cantilever beam, inclined strut, support scaffold and formwork system, sets up enclosure layer and thermal insulation layer on the outside of bracket to form local closed curing cavity;Bracket is divided into root, middle and end along the cantilever direction, and temperature and environmental monitoring points are laid out;Pre-cooling concrete is poured in layers and blocks, and according to the partition monitoring value, spray, insulation and wind opening degree are adjusted;After meeting the preset conditions, gradually open cavity and unload wind from the end to the root, and according to the order of end, middle and root, partition dismantling and subsequent maintenance are carried out.The application can reduce the water loss rate of cantilever bracket concrete surface and the temperature difference between inside and outside in high-cold high-altitude environment, slow down the effect of sudden cooling and drying, and inhibit the generation of early temperature cracks and drying shrinkage cracks.