184 results about "Self-consolidating concrete" patented technology

The invention provides a construction method of a CRTS III type slab ballastless track, and relates to the technical field of high-speed rail construction, and the construction method comprises the following steps: mounting base plate steel bars, side forms, end templates and limiting groove templates, placing foam plates at expansion joints, and reserving track slab pressing and anchoring holes; base plate concrete is poured, and base plate concrete formwork removal, surface finishing, maintenance and expansion joint construction are carried out after pouring; constructing a geotextile isolation layer and an elastic cushion layer; limiting groove steel bars and self-compacting concrete layer steel bar meshes are installed, and track plates are placed; before and after the track plate and the base plate are fastened by the pressing device, the track plate is finely adjusted by the fine adjustment device; and a self-compacting concrete formwork is installed, self-compacting concrete is poured, and post-pouring treatment and curing are conducted. The track plate and the base plate are fastened through the pressing device, so that the track plate, the base plate and the self-compacting concrete layer are tightly attached in the self-compacting concrete pouring period, and the situation that reworking or track laying is difficult due to the fact that the floating amount of the track plate is too large is avoided.

The invention discloses a rock-fill concrete pouring liquid level and compactness monitoring and evaluating method, and relates to the technical field of concrete construction. According to the invention, the compactness sensing probes are uniformly distributed in the warehouse, so that the whole warehouse surface can be comprehensively monitored. The probes are wrapped by high-strength and high-toughness materials, it is ensured that the probes cannot be damaged in the construction process, a three-dimensional Thiessen polygon method is adopted for segmenting the areas in the bin, each compactness sensing probe corresponds to one associated area, the segmentation method can adapt to irregular polygon boundaries, it is ensured that only one representative measuring point exists in each area, and the accuracy of the detection result is improved. Whether the probes are buried by the concrete or densely filled can be judged in real time through the numerical value change of the compactness sensing probes, and the liquid level position of the self-compacting concrete can be calculated according to the states of all the probes.

The invention discloses a rapid nondestructive detection method for high-speed rail plate-type ballastless track filling layer defects. According to the method, a mechanical impedance method and an impact echo method are organically combined for the first time aiming at internal defects such as void, open joint and cavity of a self-compacting concrete filling layer, and a two-stage detection mode of'rapid screening and positioning 'and'accurate quantitative diagnosis' is formed. In the first stage, mechanical impedance method rapid screening is conducted, specifically, 0.5-1.0 m grids are divided on the surface of a track plate, response signals are collected through polymer energy hammer excitation and a speed sensor, and a suspected defect area is positioned based on a statistical threshold value; in the second stage, accurate quantification is conducted through an impact echo method, grids are encrypted to 0.1-0.2 m in a suspected area, a response signal is excited and collected through an excitation and receiving integrated device trolley, and the defect type is judged according to a defect recognition function. Through the method, the detection efficiency can be improved by more than 5 times, the detection time of a single track plate is shortened to be within 10 minutes, and the method is suitable for short-time detection requirements of a skylight period of a high-speed rail.

The invention provides a door-shaped steel bar optimization method and system based on ballastless track interface damage analysis, and relates to the field of track traffic, the method comprises the following steps: determining track interlayer bonding parameters of a ballastless track based on interface comprehensive mechanical property test data of a concrete material composite test piece of the ballastless track, and establishing a finite element model of the ballastless track; a service temperature field of the ballastless track is calculated, and equivalent simulation of shrinkage of the self-compacting concrete layer is completed; on the basis of the multiple structure optimization variables, multiple door-shaped steel bar optimization schemes are determined, and the track interface damage area and distribution of the ballastless track under the combined action of shrinkage of the self-compacting concrete layer and the temperature load are calculated by utilizing a finite element analysis method based on a finite element model of the ballastless track corresponding to the door-shaped steel bar optimization schemes; the method has the advantages that the early-stage interface damage risk is reduced, and the durability and reliability of the track structure are improved.

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a method for testing the degradation characteristic of the bearing performance of a recyclable anchor rod under cyclic loading. The method comprises the following steps: preparing a unit body sample anchor-rock interface unit body sample, simulating weathered soft rock according to a specific ratio, pouring a self-compacting concrete anchoring body, and curing and forming; setting a combined parameter of a reference load ratio and a load cycle index, applying a triangular wave cyclic load to simulate a traffic condition, and executing a pull-out test to collect load-displacement data; constructing a two-parameter coupled shear strength degradation model based on test data, and proposing a shear stress-displacement curve model; an anchor rod load transfer control equation is established in combination with the Poisson effect, and shear stress distribution of the anchoring section is iteratively solved by adopting a discrete recursion method; the model is verified through a foundation pit engineering case, the ultimate bearing capacity degradation law of the anchor rod under long-term cyclic loading is predicted, and it is proved that the model can guide engineering safety design. According to the method, the coupling characterization of the cyclic load parameter and the interface degradation mechanism is realized.

The invention relates to the technical field of bridge engineering construction control and intelligent manufacturing, and discloses a steel pipe self-compacting concrete anti-disengaging method integrating whole-process prediction and compensation regulation. The whole method comprises the following steps: collecting and preprocessing a self-compacting concrete anti-falling data set, constructing a disturbance tensor, introducing a time response coupling kernel, calculating by combining the disturbance tensor to obtain a coupling potential energy expression, then obtaining a tensor potential energy fusion item according to the disturbance tensor and the coupling potential energy expression, and constructing an asymmetric disturbance potential field coupled dual-channel module. The tensor potential energy fusion item is combined to be spliced into a potential energy state tensor, a time trend response value and a variable coupling disturbance response value at the current moment are calculated through the potential energy state tensor, the obtained time trend response value and the variable coupling disturbance response value are fused and output, and a time sequence disturbance coding module is formed; and constructing a self-compacting concrete anti-void prediction model to output a predicted value so as to realize accurate prediction of steel pipe self-compacting concrete anti-void.

The invention discloses recycled aggregate self-compacting concrete with excellent impervious and waterproof effects, and relates to the technical field of recycled aggregate concrete.The recycled aggregate self-compacting concrete is prepared from, by mass, 160-180 parts of aggregate particles, 280-300 parts of cement, 3-4 parts of water reducing agent, 1-3 parts of thickening agent, 2-11 parts of air entraining agent, 80-120 parts of mineral admixture, 100-200 parts of water and 7-9 parts of expanding agent. The recycled aggregate self-compacting concrete prepared by the invention is improved in strength, durability and impermeability and waterproofness, and the quality stability of the recycled aggregate is ensured, so that the quality and performance of the finally prepared recycled aggregate self-compacting concrete have consistency, and the recycled aggregate self-compacting concrete can be prepared according to a certain proportioning sequence and proportion. The water-cement ratio is reduced, and the compactness, durability and impermeability and waterproof performance of the concrete are improved at the same time.

The present invention provides a self-compacting concrete formwork, which relates to the technical field of concrete formwork. The device includes a formwork frame, a track plate, a cross bar and a pressurizing mechanism. A slurry discharge port is provided on the side wall of the formwork frame, a track plate is provided above the formwork frame, a slurry inlet is provided on the track plate, a cross bar is provided above the track plate, and both ends of the cross bar are respectively connected to a pressurizing mechanism. The pressurizing mechanism includes a fixing member, a motor, a cam, a connecting rod, a spring and a bracket. The fixing member is provided on the outside of the formwork frame, the fixing member is connected to the motor, the output end of the motor is connected to the cam, the cam is located on the cross bar, a connecting rod is installed on the cross bar, the upper and lower parts of the connecting rod are respectively provided with springs, one end of the connecting rod is connected to the fixing member, the other end of the connecting rod is connected to the bracket, and the bracket is connected to the fixing member. The present invention improves the concrete filling efficiency, enables the concrete to completely fill the formwork, and ensures the discharge of internal air, thereby effectively improving the concrete molding quality.

The present invention provides a multi-scale toughening and shrinkage-compensating C80 high-crack-resistant self-compacting concrete and a preparation method thereof. The present invention uses low-shrinkage and crack-resistant composite cement to compensate for the shrinkage of C80 concrete, avoiding the disadvantage that general expansive agents are difficult to function due to the low water-cement ratio design of ordinary C80 concrete, and solving the problem that C80 concrete is prone to shrinkage and cracking. The present invention uses multi-scale hybrid fibers to strengthen toughness and crack resistance, and uses high-strength fine steel fibers, multi-anchor steel fibers, and temperature-shrinkage-induced organic fibers to improve the toughness of C80 concrete and its crack resistance in the heating / cooling stages on a macro scale; and uses CaCO3 and CaSO4 composite whiskers and nano-silica-modified water-based polyurethane to form a uniform three-dimensional toughening network inside the cementitious slurry, thereby improving the tensile strength and toughness of C80 concrete on a micron scale. This allows C80 concrete to have the characteristics of low shrinkage, high toughness, and high crack resistance.

The invention discloses self-compacting concrete and a preparation method thereof, and belongs to the technical field of concrete.The self-compacting concrete is prepared from, by mass, 310-320 parts of cement, 75-85 parts of fly ash, 100-110 parts of mineral powder, 830-850 parts of machine-made sand, 770-790 parts of milling material coarse aggregate, 35-40 parts of steel fiber, 8-12 parts of rubber fiber, 25-30 parts of viscosity modifier, 175-180 parts of water and 7.5-8 parts of polycarboxylic acid type water reducer. According to the self-compacting concrete and the preparation method thereof, the coarse aggregate is prepared by virtue of the rubber fibers, the steel fibers, the viscosity modifier, the machine-made sand and the milling material, so that the problems that the existing self-compacting concrete is insufficient in impact resistance, the rubber component easily floats upwards, and greenization and high performance are difficult to consider at the same time are solved.

The invention discloses high-durability aluminoferrite cement-based self-compacting concrete and a preparation method thereof, and belongs to the technical field of maritime work concrete.The high-durability aluminoferrite cement-based self-compacting concrete is prepared from 60-70 parts of freeze-thaw-resistant clinker, 20-30 parts of chlorine-resistant steel slag micro powder, 8-13 parts of high-strength corrosion-resistant desulfurized gypsum, 0.8-1.3 parts of an additive, 88-124 parts of coarse aggregate, 76-116 parts of fine aggregate and 22-38 parts of water. According to the freeze-thaw-resistant clinker, the freezing resistance of concrete is enhanced by reducing the porosity and the pore diameter. The desulfurized gypsum subjected to crystal form regulation and control enhances the sulfate corrosion resistance of the concrete. The PAA / QCS-CA hydrogel enables the early strength of the concrete to be rapidly increased, accelerates the construction progress, and ensures that the airport pavement can be rapidly put into use. The high-strength corrosion-resistant desulfurized gypsum can promote early hydration of the cement and improve the early strength.

This invention relates to the field of deep foundation pit support construction technology, specifically a nested support construction process for deep foundation pit elevator shafts and sump pits. It solves the problem that traditional caisson waterproofing technology is prone to failure due to pit wall collapse in highly permeable gravel strata, making it difficult to create stable construction conditions. The process includes a steel caisson support structure, within which a steel caisson waterproofing structure is nested. This steel caisson waterproofing structure is used in conjunction with the steel caisson support structure for nested construction. This invention, through the nested cooperation of the steel caisson support structure and the steel caisson waterproofing structure, and the injection of a self-compacting concrete filling layer, achieves an integrated support and waterproofing effect during construction. It creates a stable, dry, and enclosed working space in easily collapsible, highly permeable strata, solving the problem of failure of traditional single waterproofing technology and creating safe and reliable conditions for subsequent structural construction.

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a self-compacting rock-fill concrete dam body construction method which comprises the following steps: rock-fill body construction: screening out rock-fill materials with the particle size of not less than 300mm, and conveying the rock-fill materials to a foundation surface in a bin to form rock-fill bodies with gaps; self-compacting concrete body construction is conducted, specifically, self-compacting concrete is pumped to the upper portion of the rockfill body, the self-compacting concrete flows to fill gaps between the rockfill materials, and the self-compacting concrete is solidified and hardened into a self-compacting concrete body 3; the particle size of coarse aggregate in the self-compacting concrete is not larger than 20 mm, and the content of needle-sheet-shaped particles is not larger than 8%. According to the method, the particle size of the rockfill material is limited, and the particle size of coarse aggregate and the content of needle-sheet-shaped particles in the self-compacting concrete are limited; the self-compacting concrete can be fully filled into gaps between dam bodies of rockfill materials, so that the compactness of the dam bodies is improved, the risk of dam body engineering structure damage is reduced, and the construction quality of the dam bodies is improved.

The utility model provides a repairing system for corrosion of a photovoltaic concrete pile head, and relates to the field of photovoltaic concrete piles, the repairing system comprises a self-compacting concrete layer, a concrete anti-corrosion coating and a plurality of blocking ring pieces prefabricated and formed by UHPC materials; the segmented ring sheets and the assembled cylindrical structure integrate the advantages and characteristics of UHPC materials, and have high strength, high toughness, high impermeability, freeze-thaw resistance, chemical erosion resistance and impact resistance; a plurality of block ring pieces prefabricated and formed by UHPC materials are spliced on the outer side of a concrete pile head to be repaired on site to form a cylindrical structure, preferably, the block ring pieces are made into semicircular ring pieces, and two pieces can be spliced into the cylindrical structure, so that the construction difficulty is effectively reduced, the splicing is rapid, and the operation is simple; self-compacting concrete slurry is poured into a filling cavity gap between the cylindrical structure and the to-be-repaired concrete pile head, the slurry is a finished product prefabricated material, and the quality of cast-in-place self-compacting concrete is ensured through field construction; in addition, the concrete anticorrosive coating is coated outside the cylindrical structure made of the UHPC material, so that the durability of the structure is further enhanced.

This invention discloses a self-compacting concrete pouring device and method for slab track, belonging to the field of slab track construction technology. It includes a concrete hopper with a cylinder connected to its lower end. The cylinder is equipped with an opening and closing mechanism, which comprises an elastic rubber cylinder and a metal elastic strip sleeved on its outer side. A motor drives the metal elastic strip to move around the cylinder, achieving precise adjustment of the opening degree of the elastic rubber cylinder's inner cavity, thereby controlling the concrete discharge flow rate. A scraping mechanism is also provided inside the concrete hopper. During the reciprocating opening and closing process, the scraping mechanism is driven by a transmission mechanism to rotate stepwise along the inner wall of the hopper, automatically scraping away residual concrete. This invention achieves precise electric control of the concrete flow rate and simultaneously completes automatic cleaning of the inner wall during the discharge process, effectively improving pouring quality and construction efficiency while reducing manual labor intensity.

The present invention proposes a method for calculating the pumping resistance of self-compacting concrete, which belongs to the field of pumping. The method comprises: S1: establishing an initial pumping parameter model based on the geometric parameters of the pumping pipeline, the initial physical properties of the self-compacting concrete, and the pumping process parameters; S2: real-time acquisition of pumping condition data and digital filtering to obtain the filtered concrete flow rate; S3: calculating the dynamic plastic viscosity of the self-compacting concrete under the current working conditions using a dynamic rheological evolution model based on the pumping time, pumping ambient temperature, and relative humidity; S4: calculating the pressure loss in different sections of the pumping pipeline based on the initial pumping parameter model, the dynamic plastic viscosity, and the filtered concrete flow rate, and obtaining the total pumping resistance based on the pressure loss in each section. The present invention improves the accuracy of calculating the total pumping resistance of the pumping pipeline by taking into account the dynamic rheological properties of concrete, the effects of ambient temperature and humidity, the geometric parameters of the pipeline, and the pumping process parameters.

The invention discloses a combined structure of a height difference concrete beam and a steel pipe concrete column ring beam and a construction method.The combined structure comprises a circular steel pipe concrete column, an integrally-machined ring beam and a variable-height-difference concrete frame beam, the circular steel pipe concrete column comprises a circular steel pipe and self-compacting concrete, and the circular steel pipe is filled with the self-compacting concrete; two reinforcing outer ring plates which are vertically distributed at intervals are fixedly welded to the outer periphery of the circular steel pipe, the ring beam is fixedly connected with the reinforcing outer ring plates, and one end of the concrete frame beam is fixedly connected with the ring beam. According to the combined structure, the height or thickness of the component can be flexibly adjusted according to actual loads and topographic conditions, and the combined structure adapts to various complex working conditions; the stress state of the component can be optimized by changing the height or thickness, and the overall performance of the structure is improved; the component size can be reduced at the part with smaller stress, and the material and the construction cost are saved; complex load distribution and topographic conditions can be effectively adapted, and the bearing capacity and the anti-seismic property of the structure are improved.

The utility model provides a low-carbon self-compacting concrete deformation monitoring device, which comprises a supporting base plate, a working table, a concrete block supporting table, a positioning support plate, an extension table, a pressing push rod, a pressing seat, a detection structure and a concrete block, and is characterized in that the working table is fixedly arranged on the surface of the supporting base plate, and the concrete block supporting table is fixedly arranged on the surface of the working table; the positioning supporting plate is fixedly mounted at the top of the concrete block supporting table; the extending tables are fixedly installed at the two ends of the workbench, the downward pressing push rods are fixedly installed on the surfaces of the extending tables, and the downward pressing bases are fixedly installed on the downward pressing push rods. The detection structure is fixedly mounted on the extension table, and the concrete block is placed on the positioning supporting plate; due to the arrangement of the workbench and the detection structure, three-point testing and four-point testing can be carried out at the same time, data generated by testing can be collected in time, and concrete blocks can be stably placed.

A track plate shape and position real-time monitoring and early warning device for a high-speed rail CRTSIII type plate-type ballastless track comprises a track plate pressing facility, a prestress track plate, a self-compacting concrete filling layer and a base plate and further comprises a sensing device and a fixing device, and the sensing device comprises a track plate displacement sensor and a track plate pressing force sensor. The track plate displacement sensor is installed on the fixing device, and the track plate pressing force sensor is installed on a track plate pressing facility. The track plate displacement sensor and the track plate pressing force sensor carry out early warning in advance by sensing displacement and pressure changes generated in the construction process of the prestressed track plate, the pressing force and displacement data of the track plate can be monitored in real time in the construction process of a track plate filling layer, and the construction efficiency of the track plate filling layer is improved. And wireless transmission and real-time display of data are realized, and timely early warning in the construction process of the high-speed rail track board is further realized.

The invention discloses a modified material for improving construction robustness of a self-compacting concrete mixture as well as a preparation method and application of the modified material, and belongs to the technical field of building materials. The modified material comprises the following components in percentage by mass: 60%-70% of a composite mineral admixture, 15%-20% of zeolite powder, 12%-15.5% of nano calcium carbonate, 0.5%-1% of lignin fibers and 2%-4% of an organic rheology modifier. The modified material for improving the construction robustness of the self-compacting concrete mixture disclosed by the invention can effectively improve the segregation resistance and the water retention capacity of the self-compacting concrete mixture and improve the construction robustness of the self-compacting concrete mixture; the construction performance of the self-compacting concrete mixture can be kept stable under the condition that the water content of the raw materials fluctuates to a certain extent, so that the construction quality of the concrete is guaranteed, and important application value is achieved.

The invention belongs to the field of self-compacting fiber concrete, and particularly relates to a preparation method of C80 self-compacting fiber concrete based on superfine marble powder, which comprises the following steps: 1, preparing a premix comprising superfine marble powder, mineral powder, gypsum, Portland cement, water and a water reducing agent; 2, preparing fine aggregate and coarse aggregate; 3, adding the aggregate and the premix into a stirrer, performing dry stirring for 1-2 minutes, adding water, and stirring for 3-5 minutes until the materials reach a fluidized state; and 4, adding the modified steel fiber into the stirrer, and continuously stirring for 3-5 minutes to obtain the C80 self-compacting fiber concrete based on the superfine marble powder. According to the C80 self-compacting fiber concrete based on the superfine marble powder obtained by the preparation method in the scheme, the strength of concrete is improved, the brittleness of high-strength self-compacting concrete is well overcome, and the bending deformation capacity of a component made of the concrete under different use environments and load conditions is effectively improved.

The utility model relates to a connecting plate structure of a self-compacting concrete steel pipe column, which belongs to the technical field of steel pipe concrete pouring and comprises a rectangular steel pipe column, a communication component used for being communicated with the outside is mounted on the outer side of the rectangular steel pipe column, and a connecting bottom plate is fixed at the bottom of the rectangular steel pipe column. A plurality of folded plates are fixed on the outer side of the rectangular steel pipe column; the communicating assembly comprises a connecting top plate fixed to the top of the rectangular steel pipe column, a pouring hole formed in the top of the connecting top plate, a plurality of exhaust holes formed in the top of the connecting top plate and evenly distributed in the outer side of the pouring hole, and a plurality of grout overflowing channels formed in the outer side of the rectangular steel pipe column and communicating with the interior of the rectangular steel pipe column. According to the self-compacting concrete steel pipe column connecting plate structure, the situation that pouring is not compact due to bubble retention can be greatly reduced, workers on the outer side can conveniently judge whether pouring is in place or not, the working efficiency is improved, the working quality is also improved, and the structure is very practical.

The utility model relates to the technical field of concrete measurement, in particular to a self-compacting concrete self-shrinkage measuring device which comprises a support, a sliding rail is fixedly connected to the inner side of the support, a sliding block is movably connected to the interior of the sliding rail, fixing cylinders are fixedly connected to the inner side of the sliding rail, a steel box is placed between the fixing cylinders, and the steel box is fixedly connected to the inner side of the support. And telescopic devices are fixedly connected to the two sides of the interior of the support correspondingly, and laser distance measuring sensors are fixedly connected to the inner sides of the sliding blocks and the lower ends of the telescopic devices correspondingly. Compared with the prior art, by arranging the sliding rail, the sliding block, the steel box and the telescopic device, the self-shrinkage amount of the upper side, the lower side, the left side, the right side, the front side and the rear side of the self-compacting concrete test piece can be measured at the same time, the measurement positions are comprehensive, and the overall shrinkage situation of the self-compacting concrete test piece can be reflected; therefore, the self-shrinkage amount of the self-compacting concrete can be accurately measured, and the measurement precision is improved.

The invention discloses a viscosity modified material for keeping the homogeneity of self-compacting concrete, a preparation method and application. The material comprises the following components in parts by mass: fly ash, slag powder, metakaolin, cellulose ether, limestone powder, zeolite powder, an air entraining agent, a functional component A and a functional component B, wherein the functional component A is prepared by compounding and drying nano silica fume, modified carbon nanotubes subjected to ultrasonic dispersion by sodium dodecyl benzene sulfonate / absolute ethyl alcohol and tungsten disulfide subjected to activation-silanization-polycarboxylic acid modification treatment, and the functional component B is prepared by shearing and uniformly mixing magnesium oxide and a calcium expanding agent at a high speed. The material can improve the viscosity, delay segregation and bleeding and reduce the water use sensitivity under the condition that the yield stress is not obviously improved, meanwhile, the early strength development is promoted, the volume stability is improved, and the durability such as chloride ion permeation resistance is improved, so that the homogeneity and quality consistency of a component in the pouring process and after hardening are guaranteed.

The invention relates to a rise pouring construction method of rock-fill concrete and the rock-fill concrete. The ascending layer pouring construction method of the rock-fill concrete comprises the following steps that cantilever formworks are installed on the side face of a pouring bin number in a surrounding mode; a first positioning cone is pre-buried in the pouring warehouse number; the particle sizes of the block stones are screened according to the volumes of the pouring bin numbers, and the screened block stones are conveyed into the pouring bin numbers; dimension stone stacking is conducted in the pouring bin number, and a first dimension stone layer, a second dimension stone layer and a third dimension stone layer are sequentially stacked in the pouring bin number from bottom to top; self-compacting concrete pouring is conducted in a partitioned pouring mode; and a plurality of concrete discharging points are arranged in the pouring subareas to pump the self-compacting concrete into the pouring bins, so that the concrete is synchronously poured and ascended. The ascending layer pouring construction method of the rock-fill concrete and the rock-fill concrete have the advantages of being high in construction efficiency and high in quality.

The application discloses an additive for high self-compacting performance concrete of a rock-fill dam and a preparation method thereof, and belongs to the technical field of concrete additives. The additive for high self-compacting performance concrete of the rock-fill dam provided by the application comprises the following raw materials in parts by weight: dispersing component A 550-600 parts, water-retaining and self-maintaining component B 60-100 parts, enhancing component C 100-140 parts, shrinkage-reducing component D 30-60 parts, anti-permeation component E 100-150 parts and water 0-110 parts. The additive for high self-compacting performance concrete of the rock-fill dam provided by the application can significantly improve the working performance, early and later mechanical properties and durability (anti-shrinkage and anti-permeation) of the high self-compacting concrete.

A system for testing the filling and flow capacity of self-compacting concrete (SCC), consisting of: a filling box with a volume of approximately 5.3 liters; Steel bars arranged horizontally and vertically inside the filling box to simulate reinforcement obstacles; a settling cone arranged in an inverted position for introducing SCC into the filling box; a horizontal closure configured for the controlled release of SCC; the time SCC needs to fill the box is measured as an indicator of its filling and throughput capacity.

The invention relates to the technical field of self-compacting concrete, in particular to super-mass steel box concrete and a mix proportion design method. The method comprises the following steps: step 1, determining an initial mix proportion D0 = (W10, W20, W30, W40, W50, W60) T according to performance parameters of concrete; step 2, adjusting the design range of each component of the concrete by taking the initial mix proportion as a benchmark to form a to-be-selected mix proportion set D; 3, concrete mixing is conducted according to all the to-be-selected mixing ratios, and adiabatic temperature rise calculation, shrinkage testing, compressive strength testing and self-compacting performance testing are conducted; and 4, selecting an optimal mix proportion D * by adopting an optimal mix proportion decision model. The concrete has multiple performance objectives of self-compaction, low shrinkage, low temperature rise and high crack resistance at the same time, is suitable for design of the concrete mix proportion in a bridge tower steel box of an extra-large bridge, and improves the durability of the bridge.

The utility model relates to the technical field of power transformation framework foundations, in particular to a power transformation framework steel pipe column insertion type foundation. The plug-in foundation comprises a framework foundation arranged above the cushion layer, and a cup opening is formed in the framework foundation; a plurality of embedded anchor bolts are arranged in the framework foundation, and two semicircular ring plates are symmetrically mounted on the framework foundation through the embedded anchor bolts; self-compacting concrete used for wrapping the root of the connecting framework steel pipe column is poured in the cup opening. The problem that a framework steel pipe column and concrete in a cup opening can be pulled out together is solved, a framework foundation and a semicircular annular plate can be connected through pre-embedded anchor bolts, and through cooperation of arrangement of an inner transverse partition plate, chiseling of the inner wall of the cup opening, arrangement of an anti-shear stud, welding of a steel bar ring and pouring of self-compacting concrete, the structure is simple, and construction is convenient. The function that the framework steel pipe column, the concrete in the cup opening and the framework foundation are stressed cooperatively can be achieved, the framework steel pipe column can be prevented from sliding, the risk that the framework steel pipe column is pulled out is reduced, and the safety of the column base joint is improved.