207results about How to "Improve constructability" patented technology

The invention relates to a cement-based grouting material used for strengthening repairing as well as a preparation method and application thereof. The cement-based grouting material comprises the following components in parts by weight: 300-500 parts of cement, 200-300 parts of admixtures, 300-400 parts of fillers, 3-6 parts of water-reducing components, 0.1-1 part of plastic swelling component, 10-20 parts of hardened swelling components, 0.01-0.2 part of stable component, 1-4 parts of early strength components, 0.2-2 parts of defoaming components and 0.01-0.2 parts of emulsifying component. The cement-based grouting material disclosed by the invention has performance advantages such as higher injection-molding performance, initial fluidity not greater than 17s, impermeability not exceeding 1mm, wear resistance not exceeding 10cm<3> / cm<2>, compressive strength within 2 hours not lower than 5MPa, compressive strength within 1 day not lower than 30 MPa, and the like. The cement-based grouting material has composite swelling, the free swelling ratio within 3 hours is 0.02%-2% and grouting is full and dense; the viscosity is low, the volume stability is good and durability is good; the cement-based grouting material does not contain VOC (volatile organic compounds), and is environment-friendly.

The invention belongs to the technical field of building materials, and particularly relates to an internal wall putty which comprises the following components in parts by weight: 150-300 parts of white cement, 500-900 parts of calcium carbonate powder, 10-50 parts of grey desert soil, 1-8 parts of cellulose ether, 7-30 parts of polymer latex powder, 1-10 parts of water repellent, 0.05-3 parts of starch ether and 0.5-7 parts of wood fiber. Compared with the prior art, the internal wall putty has the advantages that 107 glue water or 801 glue water is not used, thus formaldehyde is not contained, the environment is protected; and pregelatinized starch is not used, and the water repellent is added, thus the internal wall putty has the function of preventing water and moisture. In addition, with the white cement and the calcium carbonate powder as the strength basis and the grey desert soil as an auxiliary strength material, the strength of the internal wall putty is ensured; due to the synergistic effect of the cellulose ether and the starch ether, the water-retaining property and the application property of the internal wall putty are ensured; and because the polymer latex powder is added, the flexibility of the internal wall putty and the adhesion of the polymer latex powder and the wall are improved.

The invention relates to a spraying quick-setting rubber asphalt waterproof coating material. A special technology is adopted for preparation of the spraying quick-setting rubber asphalt waterproof coating material. The spraying quick-setting rubber asphalt waterproof coating material is a water-based spraying paint prepared according to a ratio, and a preparation method of the spraying quick-setting rubber asphalt waterproof coating material comprises following steps: a liquid rubber asphalt latex emulsion is prepared by mixing superfine, suspended and micro-emulsion modified emulsified asphalt with high-molecular polymer rubber latex; and the liquid rubber asphalt latex emulsion is mixed with a coagulant. Cold spraying construction is adopted for preparation of the spraying quick-setting rubber asphalt waterproof coating material; elastic coating film elongation is more than 1000%; restoration ratio is more than 95%. The spraying quick-setting rubber asphalt waterproof coating material possesses ultraviolet resistance, high construction efficiency, high bonding strength, excellent high-temperature resistance, excellent low temperature flexibility, and better quick setting effect; and is capable of forming films in 3 seconds. The spraying quick-setting rubber asphalt waterproof coating material is water based; is friendly to the environment; possesses no toxicity, and excellent endurance; is quick and convenient for construction; and is a novel environmental friendly waterproof paint with a wide application range. The spraying quick-setting rubber asphalt waterproof coating material is mainly used for various waterproof and anticorrosion projects. The spraying quick-setting rubber asphalt waterproof coating material is used for individual construction of waterproof projects, for composite construction of waterproof projects together with waterproof roll, and for individual construction of anticorrosion projects.

Provided are an apparatus and method for opening and closing a window by slidably moving a movable window sash or door (hereinafter collectively called a ‘movable window sash’) with respect to a fixed window sash or door (hereinafter collectively called a ‘fixed window sash’). The apparatus is designed such that the movable window sash cannot only slide along a rail mounted within a blank frame but also be separated from a roller to move back and forth from any position on a rail toward the blank frame or the fixed window sash in a perpendicular direction with respect to a length direction of the rail, thus allowing the entire seal member interposed between either the blank frame or the fixed window sash and the movable window sash to be uniformly pressed in the perpendicular direction. Thus, excellent soundproofing, air tightness (windproofing), water tightness, insulation performance, and wind pressure resistance can be provided. Furthermore, the sliding window system has a simplified opening / closing structure and a minimum number of components, and low manufacturing cost.

The invention discloses an integral lifting system and a construction method for arch bridge ribs. The integral lifting system comprises a pair of triangular steel frames, two lifting stations, arch rib brackets and an integral arch rib of an arch bridge, and a barge for conveying the integral arch rib. The triangular steel frames are fixedly rested on bridge piers and symmetrically disposed on two sides of main span of the arch bridge, an arch rib closure section in closure with the integral arch rib is disposed on the inner side of the arch bridge main span and close to the corresponding triangular steel frame, the lifting stations are disposed on the triangular frames respectively, the arch rib brackets are rested on the barge and support the integral arch rib, the lifting stations are connected with the integral arch rib through lifting steel stranded wires, the integral arch rib which is lifted up is in fixed closure with the arch rib closure sections, and accordingly the integral arch bridge is formed. The integral lifting system is adaptable to severe construction environments, and accordingly construction progress is quickened. The invention further provides the construction method for integral lifting of the arch bridge rib.

The invention discloses hydraulic moulded bag concrete using industrial solid waste, which is prepared by the processes of mixing crude aggregate, fine aggregate, cementing material, reinforcing fiber and water by stirring, injecting the mixture into a moulded bag, and the like, wherein weight portion and content range of the components comprise the following: 3 to 4 portions of the crude aggregate, 0.5 to 2 portions of the fine aggregate, and 1 portion of the cementing material, and the ratio of the water to the cementing material is 0.35 to 0.85; the reinforcing fiber is an additive, and the adding amount of the reinforcing fiber is 0.1 to 5 percent of the total weight of the cementing material; the crude aggregate is steel slag or tailings; the fine aggregate is tailing sand or coal ash coarse slag or river sand; and the cementing material consists of the steel slag, coal ash, silicate cement clinker, mineral slag, and alkaline excitation agent accounting for 0.1 to 3 percent of the total weight of the components, which are mixed and milled, or is formed by milling each component raw material of the cementing material and then mixing the milled raw materials. The hydraulic moulded bag concrete has the advantages of stronger construction performance, mechanical strength, underwater stability and low cost, and can be widely applied in the fields of processing, construction and the like of bank protection and dike strengthening materials for rivers, lakes and sea.

The invention discloses a method of a manufacturing technology of an ultra-deep large cylinder-shaped drilling platform main hull, which comprises the following steps: division of construction stage of the cylinder-shaped drilling platform main hull, construction of double bottom total stage, manufacturing folding of a cylinder body, folding of deck section, and carry and hoisting of superstructure. The invention is provided with a platform structure for strengthening the whole resistance, can be applicable to various marine environments, is free from changing navigation bearing with the wind, has better stability, and can achieve the safety level of preventing immeasurable wind waves.

A battery module to accurately position a barrier between unit batteries and improve constructability of a battery module, including at least two unit batteries, and at least one barrier interposed between the unit batteries. The barrier includes a pair of panels facing each other and having protrusions on a surface of each panel that faces the other panel, at least one jointing hole formed in each panel, and a locking pin inserted into the jointing hole to combine the pair of panels with each other.

The invention discloses a kind to use in beam column the connection round steel pipe coagulation earth pyramid pitch point and its the manufacture method, it mainly included the round steel pipe coagulation earth pyramid and the steel girder which connected with this column, the round steel pipe coagulation earth pyramid and filled in in this round steel pipe including the round steel pipe the concrete, in carried with steel pipe coagulation earth pyramid connection steel girder Liang is equipped with an end board, this steel pipe coagulation earth pyramid with stated between the end board to be equipped with the belt rib level the steel plate, level the steel plate solidified on the round steel pipe, carried the board, level the steel plate as well as the round steel pipe through as soon as passed through core excels in the bold fastening in together. The invention cost inexpensive, mechanics performance good, design succinct convenient, the construction difficulty is small, also can avoid the scene welding, improves the connection quality and the construction benefit.

The invention discloses an asphalt pavement repair material, and belongs to the field of engineering materials. The asphalt pavement repair material is prepared from 20-60 parts of monomers of thermosetting polymers and / or prepolymers of the thermosetting polymers, 2-8 parts of an antioxidant, 1-8 parts of an accelerant, 10-30 parts of an admixture, 5-60 parts of the thermosetting polymers, 10-40parts of an initiator, 10-20 parts of a reinforcing agent, 1-60 parts of a diluent and 10-40 parts of aggregates. The asphalt pavement repair material has the advantages of being high in condensationrate, strength, waterproofness and abrasion performance and capable of repairing pavement and getting the traffic to move again in 30 minutes and making construction easy. According to a pavement repaired with the asphalt pavement repair material, the compressive strength can reach 100 MPa, the wet wheel abrasion value is smaller than 800 g*m<-2>, and the load wheel adhesion sand amount water immersion 1d is smaller than 450 g*m<-2>.

Provided are a stiffener for connecting a prestressed concrete beam and a method of constructing a structure using the same, in which the beam such as the prestressed concrete beam which is covered with concrete is connected to a target structure including a column structure or a girder. The stiffener is made up of a buried stiffener, an end face stiffener, and a joint stiffener, thereby enabling simple connection, excellent stress transmission, and very efficient construction of (building) structures.

The invention relates to a nanometer scaling-resistant and anticorrosion coating material used in gathering pipelines, which is utilized to prevent scaling and corrosion inside petroleum gathering pipelines and characterized in that: the coating material consists of 1 weight portion of an agent A and 0.1 to 0.3 weight portion of an agent B, wherein, the agent A comprises bisphenol A epoxy resin, n-butyl alcohol, xylene, dibasic ester, polyether modified polydimethylsiloxane, high molecular weight block copolymer containing pigment affinity group, defoaming polysiloxane, polyether oxosilane copolymer, polyacrylate, high molecular weight poly carboxylic acid and nanometer titanium dioxide containing amine derivative, nanometer silicon dioxide, sericite, talcum powder and crystalline flake graphite; and the agent B comprises polyamide additive product, n-butyl alcohol and dibasic ester. The effects of the invention are that: the coating material has good constructability and storage stability and the film coating thereof has excellent scaling-resistant performance and good anticorrosion performance; the rate of scaling prevention for the pipelines can achieve above 80 percent.

A method for retrofitting a reinforced concrete column by compressing a reinforcing plate including a steel plate using an external pressure is provided. The reinforcing plate is compressed to double-layer or more, that is, multi-layer in due order, on the reinforced concrete column. Accordingly, since a workability of the retrofit is excellent and since the reinforcing plate is easily compressed on the surface of the reinforced concrete column by a small lateral pressure, sufficiently the reinforced concrete column could be reinforced. Besides, a compressive strength of the reinforced concrete column could be increased. In addition, the flexibility of the reinforcing plate and the energy absorption force of the reinforcing plate could be increased.

The invention discloses a recoatable UV-curing colored one-step-coating aluminum powder paint and a preparation method thereof. The paint is prepared from the following components in parts by weight: 20-45 parts of photosensitive acrylate prepolymer, 15-25 parts of modified acrylate resin, 10-20 parts of reactive acrylate monomer, 3-7 parts of photoinitiator, 4-8 parts of aluminum powder, 3-7 parts of aluminum powder orienting agent, 0.3-0.7 part of assistant, 0-6 parts of pigment and 15-30 parts of mixed solvent. The paint can be used for ABS (acrylonitrile-butadiene-styrene), PC (polycarbonate), PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride) and other plastic substrates, and thus, has wide applicability; the paint has the characteristics of high UV curing speed, low VOC (volatile organic compound) content, energy saving and environment friendliness; the paint is simple in construction technique, does not need any additional curing agent, and can achieve the effects of favorable leveling property, orderly aluminum powder arrangement and the like; the coating has the advantages of high hardness, favorable wear resistance, favorable solvent resistance and bright and adjustable color, and can satisfy the demands for protection and decoration by one coating step; and the paint can be recoated repeatedly, and has excellent adhesive force and metal sensation.

A composite decorative plate is composed of surface layer and base layer. It is prepared through proportionally mixing high-Al cement NO.525, the mixture of quartz sand and powre and the additive containing pigment, stirring, pouring in mould, vibration, absorbing the surfacial water, pouring the mixture of high-Al cement No.525, expanded pearlite and water, and pressure smoothing. Its advantages are high lustre, light weight, fire retarding, and heat and sound insulation.

The invention discloses an iron phosphate cement, belonging to the technical field of building materials. The cementing material is prepared by uniformly mixing the following raw materials with the particle size of 1-100 mu m in parts by weight: 100 parts of acid phosphate, 400-800 parts of waste residue containing rich iron oxides, 3-6 parts of coagulation regulating material, 10-30 parts of other industrial waste residues and 15-200 parts of water. The iron phosphate cement has the advantages of adjustable setting time (several minutes to several hours), quick hardening, high strength, high binding property, no reduction of later strength, and the like, and can be quick hardened at normal temperature. The iron phosphate cement is simple in preparation technique, has high constructability, is suitable for quick emergency repair of defects of roads, airport pavements, bridges, tunnels, cooking ranges, dams, ditches and other engineering structures, and has wide application prospects in curing of high-risk waste residues containing rich radioelements, heavy metal elements, arsenic and the like.

The invention relates to a flame-retardant sound insulation composite material. The flame-retardant sound insulation composite material comprises the following components in percentage by weight: 5 to 30 percent of PVC, 5 to 30 percent of chlorinated polyethylene, 15 to 80 percent of iron powder of which the grain diameter is 10 to 100 microns, 0.5 to 2 percent of coupling agent and 9.5 to 23 percent of aid. The invention provides the flame-retardant sound insulation composite material, which is prepared from the PVC, the chlorinated polyethylene, the iron powder with the grain diameter of 10 to 100 microns, the coupling agent and the aid, has good flame-retardant sound insulation effect, and also has the characteristics of flame retardancy, innocuity, no lead, high strength, good construction property and low cost. Because the chlorinated polyethylene is particularly introduced into the material components of the flame-retardant sound insulation composite material, the using amount of a plasticizer of the material is reduced, and the composite material has better softness and can be widely applied to sound insulation treatment in the construction industry, decoration field and the like; and the sound insulation composite material can effectively reduce the noise, and the sound insulation index of the material can reach 25 to 32 decibels.

The invention provides a tapping channel casting material with good oxidation resistance. The casting material comprises the following raw materials in percentage by mass: 60 to 70 percent of white corundum granules with a diameter of 0 to 8 millimeters, 2 to 8 percent of silicon carbide with a diameter of 0 to 1 millimeter, 10 to 16 percent of fine silicon carbide powder of 200 to 325 meshes, 2 to 6 percent of Al2O3 super-micro powder, 2 to 4 percent of SiO2 super-micro powder, 2 to 4 percent of asphalt, 2 to 4 percent of aluminate cement, 1 to 2 percent of clay powder, 1 to 3 percent of metal nitride, and 0.05 to 0.2 percent of polycarboxylic acid water reducing agent. The tapping channel casting material has the advantages that: the water consumption of the casting material is obviously reduced, the porosity of the casting material is reduced, the compactness and the strength of the casting material are improved, the flowing property of the casting material is improved, and the constructability of the casting material is improved; the casting material has excellent oxidation resistance and corrosion resistance to molten slag and molten iron; and the service life of the casting material is greatly improved.

The invention discloses an inner wall spraying putty which comprises the following materials: white cement, slaked lime, heavy calcium carbonate, cellulose ether, polymer powder, a thixotropic agent, a water reducer, a moisture repellent, a defoaming agent and wood fiber. The invention also discloses a method of using the inner wall spraying putty. The method comprises the following steps of: mixing the inner wall spraying putty with clean water, stirring the mixture to be at a uniform block-free state, standing for two minutes, and then stirring for 30 seconds. The inner wall spraying putty has a reasonable formula, and is green due to no using of 107 or 108 glue and containing no formaldehyde, the sprayed putty is flat and smooth, has a firm surface, is unlikely to dust and craze, has good water resisting property, is easily stirred uniformly, free from obvious blocks, less in spraying resistance and strong in constructability, is particularly suitable for mechanized construction, ensures the spraying effect, and also greatly improves the construction efficiency. The method provided by the invention has simple technique steps, and is easy to realize and high in efficiency.

A related soft high-specific-gravity rubber-plastic foam material for insulating sound and reducing noise consists of the following components in percent by weight: 15%-45% of rubber, 5%-20% of plastic, 10%-30% of a heavy metal powder, 3%-10% of a plasticizer, 1%-5% of a stabilizer, 1%-10% of a foaming agent, 1%-5% of a sulfurizing agent, 1%-2% of an accelerator and 1%-7% of a coupling agent. Compared with the prior art, the soft high-specific-gravity rubber-plastic foam material possesses good elasticity of rubber and good glutinousness of plastic, also possesses relatively high surface density demanded by sound-proof mass action law and additional action of "foam damping", avoids the sound-proof low ebb of a conventional sound-proof material under the effect of resonant frequency and a coincident effect, and is extremely suitable for quality improvement of all kinds of sound environments and noise-controlling places.

The invention belongs to the technical field of building materials, and provides a novel high-temperature-resistant non-curing waterproof coating. The coating is composed of the following components in percentage by weight: 25-35% of asphalt, 15-30% of rubber oil, 10-20% of waste tire rubber powder, 5-10% of styrene-butadiene rubber, 1-3% of styrene-butadiene-styrene (SBS), 4-10% of tackifying resin, 10-20% of fly ash, 2-5% of a high-temperature modifier and 2-5% of a viscosity reducer, wherein the high-temperature modifier is a BL modifier or polyamide wax. The preparation method is carried out by adopting a three-section-type feeding method and comprises the following steps: adding asphalt and rubber oil, carrying out heating to 150 DEG C, then adding the SBS, the styrene-butadiene rubber, the tackifying resin and the viscosity reducer, carrying out heating to 180 DEG C, then adding the fly ash and a high-temperature modifier, mixing the components at 180 DEG C to form a uniform liquid, and carrying out cooling and discharging to obtain the novel high-temperature-resistant non-curing waterproof coating. The invention solves the problem that a non-curing rubber asphalt waterproofcoating is poor in heat resistance.

There is provided an impact grinding assembly. The assembly, according to one aspect, includes a pair of conveyors for conveying at least partially unground material. Each conveyor has a lower portion and an upper portion which is spaced-apart above its lower portion. The assembly includes a pair of vibrating impact plates aligning below the upper portions of respective ones of the conveyors to receive the at least partially unground material. A first one of the impact plates operatively directs material thereon to the lower portion of a second one of the conveyors. A second one of the impact plates operatively directs material thereon to the lower portion of a first one of the conveyors. The impact grinding assembly may further include a material-separation assembly for removing material from the conveyors which has a particle size no greater than a desired particle size.

The invention relates to gypsum building materials, and particularly relates to a gypsum-based building material prepared from plant fibers for treating indoor formaldehyde and an application method thereof. The gypsum-based building material is formed by adding water to a mixture and then stirring the watered mixture, wherein the mixture is formed by mixing the following components by percent: 5-20% of semi-carbonization plant fiber, 30-70% of gypsum for buildings, 1-20% of semi-hydrated gypsum whisker, 1-20% of hydrated lime, 1-10% of white cement, 1-20% of expanded vermiculite, 0.1-1% of water reducing agent, 0.1-1% of retarder, 0.01-1% of thickening agent, 0.1-1% of antistatic agent and 0.1-1% of inorganic pigment, and the mass of the water accounts for 20-50% of the mass of the mixture. The utilization rate of wastes is realized; the prepared material has high formaldehyde adsorption property; the gypsum-based building material has the advantages of heat retaining property, good water resistance, small deformation, high mechanical strength, good decorative property and the like.

The invention relates to a new maintenance material of pavement crack, comprising the raw materials according to weight part as follows: 100 parts of 107 base glue, 1-10 parts of cross linker, 1-5 parts of tackifier, 5-50 parts of plasticiser, 1-100 parts of reinforcing filler, 0.1-0.5 parts of catalyst. The preparation method of the material is as follows: putting dimethyl silicone polymer base glue, reinforcing filler, plasticizer, tackifier and cross linker into a vacuum kneader to be uniformly mixed, obtaining component A; uniformly mixing catalyst and cross linker, obtaining component B; mixing components A and B according to the proportion of 1: 0.01-0.03, obtaining the material. The material has good weather resistance, aging resistance, ultraviolet resistance and self-levelling performance; the material does not need heat construction, has good repairing function for the pavement crack; the preparation method is simple; the invention can be widely applied to repairing and maintaining crack on asphalt, cement concrete pavement and correlative building.

The invention discloses a concrete-filled steel tube sleeper for a ballastless track. The concrete-filled steel tube sleeper for the ballastless track comprises two or more sleeper concrete blocks and sleeper connecting parts used for connecting the sleeper concrete blocks. Each sleeper concrete block is of a block-shaped structure and formed by pouring concrete, and each sleeper concrete block is internally provided with an embedded part for fixing the steel track and a steel-bar mesh or a stirrup connected with the corresponding sleeper connecting part. Each sleeper connecting part is composed of a plurality of hollow steel tubes transversely arranged between the corresponding sleeper concrete blocks. In the pouring process of the sleeper concrete blocks, the hollow steel tubes are filled with concrete at the same time, so that concrete-filled steel tubes are formed, and accordingly the sleeper connecting parts and the sleeper concrete blocks are integrated through pouring. The concrete-filled steel tubes are applied to the concrete sleeper for the ballastless track, the concrete-filled steel tubes are used as the sleeper connecting parts, and the concrete-filled steel tubes and the sleeper concrete blocks are formed integrally, so that the geometry retention capacity of the sleeper is effectively improved, and steel consumption is reduced; the sleeper has the advantages of being easy to manufacture, high in constructability and the like.

The present invention relates to a thermal insulator using closed cell expanded perlite. The thermal insulator using closed cell expanded perlite of the present invention includes: expanded perlite 10 to 84 wt %,ç, including dried and expanded perlite ore particles, having a surface with a closed cell shape, as an active ingredient; a liquid binder 15 to 85 wt %; and a reinforcing fiber 0.25 to 5 wt %. Accordingly, the present invention provides a thermal insulator, which enhances the rigidity of expanded perlite, minimizes porosity and gaps between the expanded perlite particles, by reducing compression ratio during compression molding, which results in lower density, improves constructability by lowering thermal conductivity, reduces material and energy costs and can reduce the area required for equipment installation by reducing the thickness of the thermal insulator.

The invention discloses an integral erecting system for a large sea-crossing arch bridge and a construction method thereof. The integral erecting system comprises a semi-submerged ship, a tugboat, modular temporary pier sections, modular temporary support sections, a beam bottom temporary supporting docking bayonet, an arch beam temporary stiffening support, an arch rib assembling support, an arch rib linear regulator, a main beam assembling support and a trestle, wherein the main beam assembling support and the arch rib assembling support are used for integral assembly of a whole arch beam on the bank, the modular temporary pier sections are supported by the trestle, the modular temporary support sections are supported by the semi-submerged ship, and alternate jacking support of the modular temporary pier sections and the modular temporary support sections is achieved by means of the semi-submerged ship through pressurized drainage and tidal fluctuation. According to the integral erecting system, after the whole arch beam is jacked to a designed elevation through pressurized drainage of the semi-submerged ship and tidal fluctuation, the whole arch beam is transferred to a bridge site through floating to be directly erected in place. The invention further discloses a large sea-crossing arch bridge integral erecting construction method.

The invention provides a high-temperature-resistant modified epoxy paint. The high-temperature-resistance modified epoxy paint comprises a main agent component A and a curing agent component B. The component A is prepared from, by mass, 30% to 40% of organosilicon-modified epoxy resin, 3% to 6% of talcum powder, 6% to 10% of mica powder, 8% to 15% of glass powder, 6% to 10% of titanium dioxide, 10% to 15 % of zinc phosphate, 10% to 15% of solvents and 1% to 6% of assistants, the sum of the mass percents of all the raw materials in the main agent component A is 100%, and the curing agent component B comprises a polyamide curing agent. In the formula, the use amount of the good high-temperature-resistance organosilicon-modified epoxy resin is small, the combined action of padding, pigment and the assistants is in cooperation, the high-temperature-resistant modified epoxy paint has good heat resistance and good rot resistance, the performance of a paint film is excellent, and low-cost protection of a metal substrate under the high temperature condition can be achieved. The invention further provides a preparing method of the high-temperature-resistance modified epoxy paint and an application of the high-temperature-resistance modified epoxy paint.

The invention discloses a steel pipe concrete sleeper suitable for ballastless tracks, which comprises two or more sleeper concrete blocks and a sleeper connecting piece for connecting the sleeper concrete blocks, the sleeper concrete block is in a block structure, and is made of concrete It is made by pouring, and there are embedded parts for fixing the rails and steel mesh or stirrups connecting the sleeper connectors; the sleeper connectors are composed of a plurality of hollow steel pipes arranged horizontally between the concrete blocks of the sleeper. During the block pouring process, the hollow steel pipe is filled with concrete at the same time to form the concrete filled steel pipe, and then the sleeper connector and the concrete block of the sleeper are poured into one body. In the invention, the concrete-filled steel tube is applied in the concrete sleeper of ballastless track, the concrete-filled steel tube is used as the connector of the sleeper block, and the concrete-filled steel tube and the concrete block of the sleeper are integrally formed, so as to effectively increase the geometric shape and position retention capacity of the sleeper, reduce the amount of steel, and have the advantages of simple preparation , Strong constructability and so on.