238 results about "Arch dam" patented technology

A system for air dam actuation of a vehicle is provided having an object sensor, an air dam, an actuation mechanism, and a control module. The object sensor is for tracking external objects located in front of the vehicle. The air dam has a deployed position and a non-deployed position. The actuation mechanism is connected to the air dam, and actuates the air dam between the deployed and the non-deployed position. The control module is in communication with the object sensor and the actuation mechanism. The control module includes logic for monitoring the object sensor for a set of object data. The set of object data is data indicating if an external object is located in front of the vehicle.

The invention discloses a distributed fiber optic sensing technology and a system for monitoring of deformation of a high arch dam, which relate to the field of crossing of a dam safety monitoring technology and a fiber optic sensing technology and are used for overcoming the defect of a conventional means for the monitoring of the deformation of the high arch dam and filling the blank of using distributed fiber optic sensing for the monitoring of the deformation of a dome dam. Aiming at the characteristics and the difficulties of the dome dam, two kinds of unique curved fiber optic packaging structures, namely, fiber optic monitoring panels in a weakly curved beam type and a micro-bending beam type, are provided. Based on error analysis and curved beam height control-camber beam segmentation construction, excellent performance, high reliability, long service life, convenience and practicability of monitoring of fiber optic deformation are ensured. A convenient and practical layout installation mode in an arch dam and a gallery, a vertical shaft and a footrill of a dam foundation is provided, so that online remote metering on multi-dimensional and large-scale time-space broad coverage of three components (radial horizontal displacement, tangential horizontal displacement and vertical displacement) of internal deformation of the arch dam, the dam foundation and a dam abutment is realized. An optical demodulation instrument is multifunctional and can be used for metering concrete temperature, reservoir water temperature, slit level in front of a dam, reservoir sedimentation and the like.

The invention discloses a method for determining inferior limit of safety coefficient of abutment stability of an arch dam. The method comprises the following steps: drawing a three-dimensional figure by using a computer, wherein the three-dimensional figure comprises a sliding block body (8), a sliding surface (7), a bottom sliding surface (4) and a side sliding surface (5); and calculating the inferior limit value of the safety coefficient of the abutment stability of the arch dam by a sliding block body three-dimensional limit balance algorithm through the volume of the sliding block body (8), the area of side sliding surface projection (9) and the area of bottom sliding surface projection (10), wherein the volume of the sliding block body (8) is obtained through the three-dimensional figure, the area of side sliding surface projection (9) is obtained through the area of vertical projection of the sliding surface (7) on the side sliding surface (5) along the vertical direction of the bottom sliding surface (4) and a ridge (6), and area of bottom sliding surface projection (10) is obtained through the area of vertical projection of the sliding surface (7) on the bottom sliding surface (4) along the vertical direction of the siding sliding surface (5) and the ridge (6). The method can reflect the true situation of the abutment stability of the arch dam accurately and is favorable for the safety of engineering design.

The invention provides an arch dam complete-deformation monitoring method. The method is characterized in that monitoring instruments are arranged in galleries or observation chambers at different elevations of a certain section of an arch dam, wherein the monitoring instruments include a perpendicular monitoring instrument and an inclined monitoring instrument, and the perpendicular monitoring instrument and the inclined monitoring instrument are arranged on a one-to-one correspondence mode; by means of the monitoring result of the inclined monitoring instrument, deformation of an upper dam body at a monitoring point during the period that a perpendicular line is not installed is calculated, and accordingly a perpendicular line monitoring result of a segmented section of the arch dam is corrected, and actual complete-deformation of the arch dam is obtained. The method solves the problem that the actual complete-deformation of the arch dam cannot be monitored, is successfully used in water-power engineering, achieves a good effect and is good in practicability. The method changes safety monitoring design and monitoring methods of arch dams in China, and has wide market prospects and popularization value in the arch dams.

The invention discloses an arch dam safety evaluation method based on structural strength, foundation skid resistance and overall stability, and relates to the field of arch dam safety control analysis and design. The arch dam structural strength safety coefficient K1 is obtained by calculating the ratio of the strength allowed to be used for arch dam large-size concrete to the pressure stress calculated through the multi-arch beam method revised after considering influences of the calculation parameter and other factors, and the given evaluation standard is more reasonable and credible. The arch dam foundation skid resistance safety evaluation is conducted by giving possible sliding block modes such as large sliding blocks, small sliding blocks and stepped sliding blocks and the application guide and the control index K2 of the calculation formula on the basis of the rigid limit equilibrium method. The arch dam overall safety evaluation method includes the step that overload coefficient control indexes such as structure cracks and nonlinear deformation are given by conducting experimental research on the basis of a three-dimensional nonlinear finite element method and a geomechanics model and further increasing the overload capacity and the overload coefficient K3 of the water unit weight on the basis of the basic combination effect. An arch dam static force design safety evaluation system is formed by K1, K2 and K3 evaluation mentioned above.

The invention discloses a temperature-control anti-cracking method used for a concrete arch dam with a good anti-cracking effect. The temperature-control anti-cracking method used for the concrete arch dam comprises synchronous-cooling area temperature control and synchronous-cooling area height range control which are synchronously carried out. A finite element method is adopted to carry out numerical calculation and optimized analysis on five factors of a water pipe cooling process, construction progress, cantilever height, seasonal temperature change and a constraint condition, so that temperature real-time control adaptive to the synchronous-cooling area height is realized, and the anti-cracking effect of the concrete arch damis relatively good.

The invention discloses a teaching model for construction of an earth and rockfill dam. The earth and rockfill dam has a clay core and is constructed by filling and laminating earth and rockfill layer by layer, clay masonry is substituted by bricks within 60cm of the outline of the earth dam, two sides of the cross section of the earth and rockfill dam are supported by channel steel 6.3, pulled and fixed by round steel phi20 and enclosed by toughened glass with the thickness of 8mm; the earth and rockfill dam comprises an earth and rockfill dam top, a dam body seepage-proofing body, a drainage facility, a protective slope and dam slope drainage facility and a visiting passageway, wherein a standard traffic road is built on the earth and rockfill dam top, border stones and drainage ditchesare arranged on the downstream side of the earth and rockfill dam top; rock mounds and the drainage ditches are arranged at the foot of the earth and rockfill dam to constitute the drainage facility;a dry stone pitching is arranged on the upstream face of the dam body of the earth and rockfill dam, and a turf protective slope provided with concrete meshes is arranged on the downstream slope of the dam body of the earth and rockfill dam; and the visiting passageway is arranged in a laboratory. According to the invention, field teaching and actual practices are combined to make the shortage ofthe work site practice outside schools.

This invention discloses a symmetrical close laser arch dam monitoring method, which comprises the following: to divide an arch dam into several linear sections; to analyze relative displacements between each small section; to get a general arch situation of whole arch dam through a known end; to get absolute displacement and inclination angle of each dam section through math model; to achieve self-adapting correction effect through bi-direction monitoring by use of symmetrical monitoring system and to realize the six-dimension parameter automatic monitoring with high accuracy.

The invention belongs to the technical field of displacement measurement and relates to an automatic three-dimensional displacement monitoring method for arch dam deformation. The method comprises the steps of dividing an arch dam into n sections, measuring a three-dimensional displacement value at the position of an end point of a first section, and monitoring the three-dimensional variation of the end point of each section, relative to the previous end point, so as to obtain the three-dimensional displacement value of the end points of all the sections according to a transfer principle. The method is simple and feasible, and convenient for engineering implementation, conforms to the practical engineering monitoring needs, provides an effective means for automatic three-dimensional displacement monitoring on the arch dam and overcomes the defect that the original measurement method only can monitor one-dimensional or two-dimensional displacement; in addition, the practical deformation condition of a dam body is combined, while the measurement effectiveness and the measurement precision are ensured, the corner parameter monitoring on a platform part of a measured part is cancelled, the measurement process is optimized, the measurement device is simplified, the measurement reliability is improved and the measurement cost is reduced.

The invention provides an automatic monitoring system for a grouted rubble arch dam. The automatic monitoring system comprises a data acquisition module, a data center library module and an arch dam safety monitoring, analyzing and early warning module. The data acquisition module comprises a water level sensor, a temperature sensor and a dam body radial displacement monitoring module; the data center library module is used for storing historical data generated by the data acquisition module and the arch dam safety monitoring, analyzing and early warning module; and the arch dam safety monitoring, analyzing and early warning module performs threshold judgment on the monitoring data transmitted by the data acquisition module through a multiple linear regression method and / or an LSTM methodand / or a Gaussian process regression method and / or a convolutional neural network method so as to determine whether early warning information is sent or not. According to the method, a dam safety inversion model and a prediction and evaluation early warning system of the grouted rubble arch dam are provided, the structure checking time can be pushed to the second-level response through the application of an artificial intelligence method, and a new path is opened up for real-time safety evaluation and prediction early warning analysis of the dam.

The invention relates to an arch dam construction period deformation field dynamic fitting analysis method based on BIM (building information modeling). The method includes the steps: projecting a dam section grid model and a measuring point space point cloud model by a central divergence projection algorithm according to structural characteristics and deformation measuring points of an arch dam to form a projected plane; fitting deformation field data by a butterfly difference interpolation fitting algorithm based on a projected plane model and a measured value distribution model based on a projected structure, and mapping fitted deformation value sequences to three-dimensional grid model nodes of an arch dam structure in a one-to-one corresponding manner; building a post-processing analysis window and generating and visually displaying a cloud chart, a displacement diagram and contour lines of model data. According to the arch dam construction period deformation field dynamic fitting analysis method based on BIM, construction progress and deformation monitoring data real-time driving arch dam deformation field data can be visually expressed.

The invention relates to a high-mountain narrow-valley arch dam foundation segmented and staged grouting method, and belongs to a foundation treatment method of a rock surface of a high steep bank slope foundation of a high-mountain narrow-valley arch dam foundation. The high-mountain narrow-valley arch dam foundation segmented and staged grouting method comprises the following steps: carrying out consolidation grouting and drilling after acceptance of excavation of the arch dam foundation; carrying out first-stage consolidation on the inside of a consolidation grouting hole; drilling a residual contact segment by the distance of 1 m with a phi 75 mm drilling sleeve after first-stage consolidation grouting is finished; burying a grouting system; pouring dam body concrete after first-stage consolidation grouting is finished; after joint grouting of a dam body is finished or while joint grouting of the dam body is carried out, carrying out second-stage consolidation on a consolidation grouting contact segment of the dam foundation. Consolidation of a bed rock contact segment and contact grouting are combined together, meanwhile, effects of contact segment consolidation and contact grouting are achieved, the work amount of the contact grouting system is reduced, the construction period is shortened, a construction technology is simplified, foundation treatment purposes of a high steep bank slope of the dam foundation of simplicity and convenience in construction, reliable technology, economy and reasonableness of grouting treatment of the high steep bank slope are achieved, and the problems encountered in foundation treatment of a dam segment of a bank slope are solved.

The invention discloses a dam abutment safety coefficient calculation method based on a full structural surface yield method. The calculation method includes the steps that firstly, a finite element model is established, and initial stress calculation and static force response analysis are conducted; secondly, the yield area percentage of the safety coefficient and the structural surface is obtained, a structural surface yield area percentage-safety coefficient curve graph is drawn with the yield area percentage as the vertical coordinate, and then the stability of a dam abutment of an arch dam is analyzed. The solving method using the full structural surface yield analysis method reflects the damage condition of the structural surface more accurately and visually, the influence of human factors on the value of the safety coefficient is avoided, the actual working state of the dam abutment is truly reflected, and the stability and safety evaluation of the dam abutment of the arch dam is more reasonable.

The invention discloses a method for drawing up the center line of an arch dam. Firstly, the initially-drawn-up center line of the arch dam is obtained through a traditional computing method, then theinitially-drawn-up left (right) bank chord length Lsli (Lsri) is obtained through arch rings of different elevations, the function relationship curve of the elevation values of various layers of archrings and the initially-drawn-up left (right) bank chord length Lsli (Lsri) is obtained in a fitting manner through the principle of least squares, and the optimal center line position of the arch dam is obtained by computing the arch dam center offset distance obtained when the left and right bank computing chord length deviation under the elevations of the arch rings tends to be the minimum. According to the method, it is guaranteed that the left banks and the right banks of the arch rings tend to be symmetric, and the repeated and complex manual trial process is avoided.

The invention discloses monitoring system and method of an arch dam, relating to the technical field of automatic monitoring of sluicing building structures in hydraulic and hydropower engineering. In the invention, a horizontal vibration displacement sensor is arranged on the arch dam; various working states of the arch dam can be monitored by analyzing a frequency spectrogram; the damage of the arch dam, which is possible to generate, is found in time; and the position of the damage is fast found so as to be convenient to repair and strengthen by adopting various engineering measures. The monitoring system has the advantages of simple form, convenient construction, easy maintenance, low engineering construction cost and convenient operation and management and can realize the remote control during operation. The invention reduces the interference by using the horizontal vibration displacement sensor, enhances the monitoring accuracy and meets the requirements of practical application.

The invention discloses an arch dam safety evaluation method based on a geomechanical model comprehensive method testThe method comprises the following steps: S1, building a comprehensive method testsafety evaluation index system according to detected data; s2, constructing an abrupt change model for evaluating the safety degree of the arch dam; s3, standardizing each underlying index of the comprehensive method test, and converting the underlying indexes into dimensionless data between 0 and 1; s4, performing mutation level calculation by using a normalization formula, and solving a total mutation level value of the target layer; s5, repeating the steps S1-S4, respectively calculating arch dam safety total abrupt change level values under different overload coefficients in the comprehensive method test, drawing a relation curve graph of the total abrupt change level values and the overload coefficients, and obtaining a high arch dam comprehensive method test safety coefficient according to inflection points of the relation curve of the total abrupt change level values and the overload coefficients; and S6, evaluating the overall stability and safety of the arch dam project by integrating the factors. According to the invention, the existing deformation monitoring data in the model comprehensive method test is utilized to establish a comprehensive evaluation system for the safety degree of the high arch dam comprehensive method test.

The invention relates to a hydraulic engineering computer simulation technology and discloses a method for simulating the interference between the hoisting of a steel lining of a cable crane and the concrete pouring in the concrete construction process of a high arch dam. According to the method, the interference between the hoisting of the steel lining and the concrete pouring is abstracted into digital parameters which comprise machine hours of occupying the cable crane in the hoisting process, hoisting intervals, cable crane machine-position interference factors, intermission of mounting the steel lining on the bin surface and the like, and a digital model of the interference between the hoisting of the steel lining and the concrete pouring is established by the digital parameters, and thus, the interference phenomenon between the hoisting of the steel lining and the concrete pouring in a real construction system can be reflected by changing the values of the parameters and carrying out multi-scheme simulation and sensitivity analysis, so that the construction process of the steel lining is more accurately analyzed and forecast. The method is suitable for the building construction of the high arch dam.

The invention discloses a method for determining a temperature process curve of ultrahigh fly-ash content hydraulic massive concrete. The method comprises: using normal concrete and ultrahigh mixture concrete to perform an adiabatic temperature rise test, manufacturing an ultrahigh mixture concrete cubic large test block with side length of 1.2 m to carry out a temperature measuring test, combined with an internal point actual measured temperature record of a certain double-curvature arch dam which is established by using the normal concrete, providing an ultrahigh mixture concrete adiabatic temperature rise model, to improve temperature simulation calculation program, so as to simulate a temperature process curve of an ultrahigh mixture concrete dam which has no construction precedent. The method can be used for temperature-stress test evaluation and early-age crack resistance.

The invention discloses a high-arch-dam flood discharge and energy dissipation structure of a narrow river valley and deep tail water. An upper-layer hole and a lower-layer hole are distributed on a dam body; two dams do not need to be arranged at the downstream of the dam to form a closed water cushion pool; and only a concrete apron and revetments at two banks need to be arranged. The upper-layer hole adopts combined outflow of an overlooking angle with a small angle and a depression angle with a small angle; and the lower-layer hole adopts narrow seam type outflow of a flat bottom angle, two-side shrinking and vertical dispersion, and discharged water flows of the upper-layer hole and the lower-layer hole are not collided in the air. The two paths are not arranged; and the outflow of the upper-layer hole is controlled to be the smaller angle so as to control the degree and the range of a drop point and atomization of a water tongue. According to the high-arch-dam flood discharge and energy dissipation structure, the characteristic of a water depth of a three-dimensional space dispersed energy dissipation and downstream energy dissipation region is sufficiently utilized, so that the structure form of an energy dissipation and protection facility is simplified, the damages and influences on an ecological environment and a side slope of a nodal region are reduced, the construction difficulty is reduced, and the engineering amount and the engineering investment are reduced; and therefore, good social benefits and economic benefits are obtained.

The invention discloses a complex foundation extra-high arch dam overall crack resistance design method, relates to the technical field of hydropower station arch dam design, and provides the complex foundation extra-high arch dam overall crack resistance design method. The method comprises the following steps that A, arch dam body shape design is conducted; B, the arch dam is analyzed by adopting an arch beam method, a linear elasticity finite element method, a nonlinear finite element method and a geomechanical model test method; numerical calculation and physical test results are comprehensively compared, and arch dam deformation, stress characteristics and the overall damage process are analyzed, judged and grasped, so that crack initiation points, crack weak links and reinforcement key objects and parts of arch dam damage are found out; the comprehensive influence of various factors influencing arch dam cracking on arch dam cracking is systematically analyzed; C, arch dam anti-cracking measures are designed in a targeted manner according to different cracking mechanisms of the anti-cracking weak area and the controllable cracking influence factors of the anti-cracking weak area; and D, the effect of the anti-cracking measure is evaluated by adopting a three-dimensional finite element equal numerical analysis method.

The invention discloses a layered multistrand noncollision effective dissipater structure used for the flood discharge of a high dam body in a gorge area which adopts surface spillway tail-flaring piers and deep hole narrow ridges to combine for flood discharge. The effective dissipater structure arranges a plurality of surface spillway tail-flaring piers on the top of a high arch dam; surface spillway flooding channels are arranged between neighboring tail-flaring piers so as to form a surface spillway longitudinal diffusing water flow; a plurality of deep hole narrow ridges are arranged at the one second or two third location of the height of the high arch dam; the jet flow outlets of the deep hole narrow ridges are staggered with the jet flows of the surface spillways. A straight section and a dispersing section are arranged between the tail and the head of the piers; the dispersing angle of the dispersing section relative to the straight section Theta is equal to arctan(b0-b) / 2l; in the relevant position coordinate between the crossing point A of the line of intersection of the straight section and the dispersing section and the flooding weir surface of the flooding channel, and the shaping design water head Hd of the flooding weir surface, Xi x is equal to x0Hd and Xi y is equal to y0Hd. The straight section and a shrinking section are arranged between the water flow inlet and the water flow outlet of the narrow ridges; the shrinking angle of the shrinking section relative to the straight section Beta is equal to 12 to 15 degrees; the ratio of the width d of the water flow outlet and the width D of the water flow inlet should meet 0.3 to 0.7.

A method for identifying the cross joint state during an arch dam construction period is a method which adopts an opening monitoring value of a cross joint meter to identify the cross joint state during the arch dam construction period according to a series of criterions, and relates to the technical guidance of arch dam cross joint construction. According to the method, all criterion threshold values are preset according to engineering data statistical analysis, engineering experience and the like, the cross joint meter is used to monitor the opening of a cross joint in real time, and the correlation indexes are calculated according to the criterions for identifying the cross joint state. The method has the characteristics of simple and easily understood criterions, accurate judging and simplicity for operation, has an obvious effect on real-timely and accurately mastering the cross joint real working state during the arc dam construction period, and can provide effective basis for opportunity selection, cross joint surface treatment and other strategies when grouting is carried out.

The invention discloses an arch dam monitoring system applied to water conservancy and water power engineering. The arch dam monitoring system comprises a video collection device, a signal transmission device and a computer monitoring center; the video collection device is used for collecting video images of important positions of an arch dam, the video images collected via the video collection device are transmitted to the computer monitoring center via the signal transmission device, the video images are processed via the computer monitoring center, vibration displacement curves of different positions can be obtained, and the arch dam can be monitored via analysis of the vibration displacement curves. The beneficial effects of the arch dam monitoring system are that damage that can be caused to the arch dam can be timely found out, damage positions can be rapidly discovered, and therefore various kinds of engineering measures can be taken for restoration and reinforcement; the system is characterized by simple form, convenience of construction, easy-to-maintain property, low project construction cost, convenience of operation and management and easy-to-change video collection device.

The invention relates to a method for quickly constructing arch dam with external doping MgO micro-expand concrete, wherein it comprises: (1), preparing materials; (2), mixing MgO, sand, cement and powder coal as 4-6% of whole weight; (3) externally doping MgO concrete; it quickly continuously pours concrete, uses step rolling, and cycled method, while the layer height of dam is controlled between 2.5-3m, and the cycle time of each layer is 5-7 days, each layer has 5-6 steps, and the thickness of laid material is 30-50cm; it uses high-frequency vibrator, via step method to continuously pour, while the connect surface is 45-60degress incline, and the width of bar band is 2-3m.

The invention discloses a personalized control method for cantilever height of an ultra-high arch dam, and relates to a personalized control method for the cantilever height of a concrete arch dam by utilizing a three-dimensional numerical method for solving and guiding and considering the actual construction requirement. The personality characteristics of different arch dams, different dam sections of the same arch dam and different elevations of the same dam section are further considered on the basis of the prior art, so that personalized control over the cantilever height of the ultra-high arch dam is realized by a three-dimensional finite element method. By the control method, the construction progress is accelerated, so that the construction period of the high dam is further shortened, and key objectives such as dam body water blocking and flood protection and expected power generation are achieved on schedule.

The invention discloses a slight shock monitoring system and method of a double-curvature arch dam. The system comprises a slight shock sensing device, at least one signal collecting substation and a data processing terminal; the slight shock sensing device monitors slight shock signals of different areas of the double-curvature arc dam in real time in the water storage process of the double-curvature arch dam, and sends the slight shock signals to the signal collecting substation; the signal collecting substation carries out analog-to-digital conversion on the slight shock signals, stores the slight shock signals, and sends the converted signals to the data processing terminal; the data processing terminal analyzes the converted signals to obtain slight shock evolution data of the different areas of the double-curvature arc dam. A slight shock monitoring technology is applied to monitoring for the concrete double-curvature arch dam in water conservancy and hydropower, dangerous areas of the dam body of the double-curvature arc dam in the water storage period can be deduced according to an analysis result of slight shock monitoring, stable monitoring in the storage and operation period of the double-curvature arc dam is accumulated and completed, and the system and method have sustainable economical and social benefits.

The invention relates to the technical field of dam abutment slopes and mainly relates to a determination method for different geological interface calculation parameters of sliding blocks of an arch dam abutment. The method comprises the steps of modeling, geological interface establishment, zoning, weighting calculation and the like. According to the method, a lithological distribution state of a structural surface is determined with a more accurate method in a spatial modeling mode, so that the values of the calculation parameters are closer to engineering practice, the problem that a calculation result of dam abutment slope stability analysis is not ideal due to the fact that a conventional calculation method cannot consider lithological distribution of each sliding surface and then proper structural surface calculation parameters cannot be accurately selected and used to perform calculation is solved, and the safety risk of engineering design is avoided to a larger extent.

The invention relates to the parameter acquiring technology of arch dam design and discloses a deformation-equivalence based automatic comprehensive deformation modulus calculating method for arch-dam foundations with an aim to solve problems about high error rate, low efficiency and difficulty in checking due to a manual modeling mode in the traditional technology. The method includes A), determining the scopes of models according to arch abutment positions, performing searching in a mode that deformation tends to be stable and restrain through comparison of different scopes of the models on influence of arch abutment displacement, and determining the comprehensive deformation modulus finite element standardization model; B), based on the comprehensive deformation modulus finite element standardization model, through comparison of different arch abutment section numbers on influence of the arch abutment deformation, and searching in the mode the deformation tends to be stable and restrain, determining the minimum arch abutment section numbers meeting requirements, and performing meshing on model units; C), acquiring unit parameters of composite materials in the models in an area-weighted calculation mode; D), automatically calculating the comprehensive deformation modulus. The method is applied to design of the arch dams.

The invention discloses a steel tube arched concrete dam which is characterized in that a plurality of arched steel tubes are overlapped into an arched dam; ventilation holes are reserved in the middle of arched steel tubes; concrete is filled in the arched steel tubes; arched leg bottom steel plates are welded at two ends of the arched steel tubes and are arched with rock; and concrete protective layers are cast around the steel tubes. The construction method comprises the following steps of: prefabricating the steel tubes by a factory in section and reserving the ventilation holes in the middle of the steel tubes; forming an integral arch by welding on the construction filed and then hoisting the integral arch to a plane at the dam bottom to form a first path of steel tube arch; filling concrete at one side of the steel tube arch and finishing the filling until the concrete is poured out from the other side to form steel tube concrete; welding the steel tubes and the arched leg bottom steel tubes arched on the rock; overlapping the steel tubes layer by layer by using the same construction method to the design elevation of a top surface of a dam body; and casting concrete protective layers at two sides of the steel tubes. The invention bears a main load by using the arched steel tube concrete overlapped to the design elevation from the dam bottom as an arch body according to the forced characteristics of the steel tube concrete, thereby greatly reducing the dam top section, further saving the material consumption, reducing the hydration heat, and being convenient to construct.