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2307 results about "Crushed stone" patented technology

Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers. It is distinct from gravel which is produced by natural processes of weathering and erosion, and typically has a more rounded shape.

Drying-method sand making device and process

A drying-method sand making device and a process relate to the field of sand making technology. The device includes: a jaw crusher, an impact crusher, a first grading screen, a drying-method sand making machine, a second grading screen and a concentrated dust collecting system. The production process comprises the steps: a stone material in a stone material bin is evenly fed into the jaw crusher through a feeder for a first rough crushing, the crushed material is transported to the impact crusher for a second fine crushing, the crushed material goes into the first grading screen for grading, sandstones with the size of less than 40 mm are fed to the drying-method sand making machine through a conveyor for crushing and sand making, and broken stones with the size of more than 40 mm are returned to the impact crusher; the sandstones going into the drying-method sand making machine are transported to the second grading screen for grading after being crushed by the drying-method sand making machine, sand with the size of less than 3 mm is directly fed into a finished product sand bin, and a stone material with the size of more than 3 mm is afresh returned to the drying-method sand making machine for crushing. The produced machine-made sand has good particle shape and high finished product rate, and can meet the technical index of high-performance concrete on the machine-made sand.
Owner:王燕

Burning-free geology polymer material of red mud coal ash and preparation method thereof

The invention relates to a burning-free geology polymer material of red mud coal ash and a preparation method thereof, belonging to the technical field of recycling inorganic nonmetal material and industrial solid waste. Kawazu mud powder and coal ash are taken as main substrate raw materials, building fine sands and building crushed stones are taken as aggregate, solid water glass powder is taken as alkali activator to prepare the burning-free geology polymer material of red mud coal ash. The raw materials comprise the following components based on parts by weight percent: 5-98% of the kawazu mud powder, 1-65% of the coal ash, 1-96% of the building fine sands and the building crushed stones, and 1-20% of the solid water glass powder. Counting the red mud+the coal ash+the building fine sands and the building crushed stones as 100%, the raw materials further comprise the following components based on parts by weight percent: 5-45% of water and 0.1-10% of calcium lignosulphonate. The preparation method comprises the steps of: dosing, mixing, aging, shaping, maintaining and drying, etc. The invention has the advantages of the high use ratio of industrial solid waste, the less pollution, the low energy composition and the simple operation of the preparation technology, and embodies the important meanings of environment protection, energy conservation and emission reduction.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)

Road pavement draining method and drainage structure system

ActiveCN103103905ASolve vertical drainage problemsOvercomes the disadvantages of direct discharge into municipal pipesIn situ pavingsGround-workCrushed stoneEnvironmental engineering
The invention provides a road pavement draining method and a drainage structure system. The road pavement draining method is characterized in that water falling on a lane vertically passes through a lane water-permeable surface layer, arrives at a waterproof bonding layer preventing water penetration, and enters into a water-permeable drainage system located at outer sides of drainage curbstones by a cross slope and the drainage curbstones located at outer sides of the lane; the bottoms of the drainage curbstones are provided with water-permeable curbstone bases; the water-permeable drainage system comprises a broken stone blind drain drainage system arranged at the bottoms and the outer sides of the water-permeable curbstone bases; the bottom of the broken stone blind drain drainage system is provided with a longitudinal drainage water-permeable pipe; and most of the water discharged into the water-permeable drainage system at the outer sides permeates into soil at the outer sides and forms ground water, and the rest of the water passes through the longitudinal drainage water-permeable pipe in the broken stone blind drain drainage system and then is discharged into a municipal pipe. The road pavement draining method solves the problem that rainwater on a drainage bituminous pavement is directly discharged into the municipal pipe, and has functional advantages of good safety, ecological benefits, energy saving and good economical efficiency.
Owner:SHANGHAI MUNICIPAL ENG DESIGN INST GRP

Construction method of dewatering well under foundation slab in foundation pit

ActiveCN101705691AGuaranteed validityPrecipitation costs are smallExcavationsBasementCrushed stone
The invention discloses a construction method of a dewatering well under a foundation slab in a foundation pit, comprising the following steps of: arranging the dewatering well in the foundation pit, wherein the dewatering well is not damaged in the process of excavating a foundation pit earthwork, and the effectiveness of the dewatering well is ensured; after the foundation pit earthwork is excavated to a basement, excavating interlaced ditches along the center line of the dewatering well, and paving water-filtering type geotextile in the ditches; then paving drain pipes of the dewatering well and cables in the ditches and connecting to the outside of the pit, checking the depth of the dewatering well, an extraction pump and a pipeline thereof to ensure the integrality and the reliability; then paving granular crushed stones or cobbles in the ditches, covering asphalt felt thereon to form a blind ditch; leading the blind ditch to a water collection pit at the edge of the foundation pit and arranging a surface drain on the periphery of the foundation pit; paving a subcrust and a waterproof layer under the constructed foundation slab, gradually reducing the usage quantity and the dewatering speed of dewatering wells in the foundation pit in the construction process of underground structures and upper structures thereof, and assisting in draining by adopting the water collection pit at the periphery of the foundation pit until the dewatering operation in the foundation pit can be stopped. The invention has convenient construction, safety and reliability and low cost for dewatering in the foundation pit.
Owner:南通建工集团股份有限公司

Testing device for simulating mechanical behaviors of gravel soil subgrade under reciprocating traffic moving load

The invention relates to a testing device for simulating mechanical behaviors of a gravel soil subgrade under reciprocating traffic moving load. The device comprises a peripheral framework, a test sample box, an axial loading unit, a horizontal loading system and a data acquisition system, wherein the test sample box is arranged in the peripheral framework, a gravel soil subgrade test sample is filled in the test sample box, a road slab is paved above the gravel soil subgrade test sample, the axial loading unit comprises a trundle and a hydraulic loading system, the trundle is arranged on the road slab, the hydraulic loading system applies an axial pressure to the trundle, the horizontal loading system maintains the horizontal reciprocating movement of the trundle, and the data acquisition system is arranged at the four corners of the side wall of the test sample box. Compared with the prior art, the device disclosed by the invention can simulate the mechanical behaviors of the gravel soil subgrade under the reciprocating traffic moving load to obtain the relationship between gravel soil subgrade deformation settlement and parameters of loading time, loading frequency, axial load and the like, thereby reasonably guiding the engineering practice of road engineering construction and ensuring the stability of the gravel soil subgrade.
Owner:TONGJI UNIV

Granule grouting pile of ripple plastic sleeve with hole for strengthening soft soil foundation and strengthening method

The invention discloses a grouting pile of a plastic sleeve for strengthening a soft soil foundation and a pile-forming strengthening construction method thereof. The pile consists of a pile cap, a thread sleeve, an earthwork cloth, a joint, a pile body and a pile tip; the top of the sleeve is connected with the pile cap and the bottom of the sleeve is connected with the pile tip, the side wall of the sleeve is provided with an opening hole, the outside of the sleeve is packed by the earthwork cloth, each section of the sleeve is connected by the joint, and the sleeve is filled with granules and grouted with slurry inside so as to form the pile body and a pile periphery as a slurry spreading zone. The pile-forming strengthening method comprises: connecting the sleeve to the depth of the pile length by the joint and then to the pile tip, placing the sleeve and the pile tip into an immersed tube together, beating the sleeve into a foundation by a beating machine, leaving the sleeve and the pile tip in the foundation, feeding the granules into the sleeve and grouting the sleeve to form a slurry scattered material column, spreading a slurry liquid on the pile periphery to form a spreading zone under the grouting pressure or expanding the earthwork cloth outwards to form a gourd pile body, pouring the pile cap on the pile top, and paving a reinforced material and a gravel cushion after the pile body and the pile cap are dried so as to form a composite foundation. The pile type can strengthen the contact action between the pile and the soil, can improve the bearing capacity of the pile body greatly, and is an ideal pile type for strengthening the soft soil foundation.
Owner:HOHAI UNIV

Intelligent control system for stone-crushing and sand-making machine

ActiveCN105032594AAutomatic speed adjustmentMake sure to work at full capacityGrain treatmentsElectric machineFrequency conversion
The invention relates to an intelligent control system for a stone-crushing and sand-making machine. The intelligent control system for the stone-crushing and sand-making machine comprises a control center, and the control center is connected with a whole system of the stone-crushing and sand-making machine and controls all devices of the stone-crushing and sand-making system to work simultaneously; the control center is connected with the Internet and a remote controller to conduct real-time monitoring on the equipment of the whole stone-crushing and sand-making system, and meanwhile, the control center has two startup control modes, namely, a manual adjustment mode and an automatic adjustment mode. The frequency conversion technology is adopted, the rotor speed and the discharging granularity are automatically adjusted, and the requirements for crushing stone with different hardness and making sand are met; the feed quantity is automatically adjusted, full-load work of a main machine is guaranteed, and the stone-crushing and sand-making yield is over 200% of that of a vertical-type impact sand-making machine under the same main machine motor power; monitoring is conducted on the Internet through a computer or a mobile phone, and remote monitoring operations are achieved.
Owner:SHAOGUAN HELI HEAVY IND MACHINERY

Precast concrete pile and manufacturing method thereof

The invention provides a precast concrete pile and a manufacturing method thereof. The precast concrete pile is obtained by mounting concrete into a mold mounted with a reinforcement cage framework, closing the mold, tensioning the mold, centrifugally shaping the mold, curing the mold by steam at a normal pressure; releasing the mold and curing the concrete by steam at a high pressure; raw materials of the concrete comprise a cementing material, a fine aggregate, a coarse aggregate, an admixture and water, wherein the fine aggregate is a machine-made sand or a mixture of the machine-made sand and a natural sand; the percentage of the machine-made sand in the fine aggregate by weight is 5-100%; the machine-made sand is obtained by mechanically crushing stone raw materials, such as mine tailings, industrial tailings and the like, screening the crushed stone raw materials in a graded way and removing dust from the screened stone raw materials; fineness modulus of the machine-made sand is 2.3-3.8; grain gradation of the machine-made sand meets requirements on an area 1 or an area 2 of a standard sand; and stone powder content of the machine-made sand is 2-8 wt%. According to the invention, the concrete cost is reduced and resource utilization rate is increased; and the used machine-made sand has the advantages of low silt content and controllable stone powder content, so that the performance of the precast concrete pile is improved.
Owner:JIANHUA CONSTR MATERIALS (JIANGSU) CO LTD

Tree planting method and tree planting structure in coastal saline and alkaline area

ActiveCN103947320AReduce salinityConducive to survival and growthForestrySoil-working methodsTerrainAlkali soil
The invention discloses a tree planting method and a tree planting structure in a coastal saline and alkaline area. The tree planting method comprises the steps of building a cofferdam, arranging a lifting layer, carrying out salt pressing and alkali discharging on the lifting layer, digging planting holes, paving waterproof geotechnical cloth, paving a broken stone water filter layer, paving a straw curtain water filter layer, backfilling planting soil and planting trees. According to the tree planting method disclosed by the invention, after the steps and measures are comprehensively adopted, the salt returning period of saline and alkali soil can be slowed down, good conditions are created for the surviving and the growth of the trees due to the soil fertility of the planting soil, and a greenery landscape can be easily formed after the trees are planted; since the terrain is lifted, saline and alkaline original soil is relatively reduced, alkali discharging pipes are not needed to be paved in specific construction, the period of salt discharging and alkali controlling is reduced, and the cost is reduced. The tree planting method and the tree planting structure, disclosed by the invention, are suitable for being popularized and applied in a greening process of the coastal saline and alkaline area.
Owner:SHANDONG DONGSHENG GARDEN ENG CO LTD

Comprehensive shaft sinking method of positive and raising boring for vertical shaft

The invention discloses a comprehensive shaft sinking method of positive and raising boring for a vertical shaft, which comprises the following steps: drilling into a bedrock section by utilizing a vertical shaft drill machine, forming surface soil section well holes, discharging rock-debris-containing slurry produced during the well drilling process to the ground at high speed through air lifting; prefabricating sections of well walls on the ground; adding counter weight water in the drill well, slowly sinking the sections of well walls to the surface soil section well holes by utilizing buoyancy force of slurry to the well walls in the drill well, and sequentially welding the well walls to the surface soil section well holes; filling grout between the well walls and the rock sides on the outer sides of the well walls, filling cement paste in the lowest layer, then alternatively filling upwards the cement paste and rubbles layer by layer, and obtaining a surface soil section drill well; selecting a suitable raise-bore drilling machine according to practical requirements of the diameter and depth of a bed rock section shaft; lowering the raise-bore drilling machine and fixing the raise-bore drilling machine at the bottom of the surface soil section drill well; inversely expanding the holes by utilizing the raise-bore drilling machine to form bing-holes; and the diameter of the bing-holes is enlarged to preset shaft diameter. The comprehensive shaft sinking method of the positive and raising boring for the vertical shaft greatly improves well forming speed of shaft sinking and is safe, reliable and low in construction cost.
Owner:BEIJING CHINA COAL MINE ENG CO LTD

Protection method for improving salt expansion or dissolution sink of salty soil

The invention relates to a protection method for improving the salt expansion or the dissolution sink of salty soil, which is characterized in that calcium carbide ash, fly ash, zeolite and salty soil are adopted, are mixed and stirred according to the volume ratio of 1:1:1:9 and are used for the filler improvement of a road embankment, broken stone and gravel are adopted as a buffer layer, bitumen, geomembranes and geotextiles are adopted as a partition layer, a geogrid reinforcement improved filler is adopted, a sack filled with greening grass seeds, shrub seeds and improved soil is adopted to press the toe of a slope, and a side slope adopts the protection of the companion planting of grass and shrub and the combination of a hanging net. The invention has the following advantages of: (1) adjusting measures to local conditions, making full use of the salty soil, saving resources, utilizing wastes, such as the fly ash and the like, and realizing the utilization of the wastes; (2) adopting a structural protection system formed by the improved salty soil and a geogrid together and solving the problems of stability and uniform settlement of a fill slope; and (3) combining the grass and the shrub, reaching the ecological requirement on one hand, solidifying a sloping surface on the other hand and preventing the water and soil loss and the salt expansion or the dissolution sink. The invention is suitable for the problem of engineering improvement of the salty soil in civil engineering and can be used for the engineering of the filling of a highway embankment, the protection of the side slope, the construction of a foundation, the improvement treatment of a foundation pit and the like.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI

Magnetic-gravity combined ore dressing technology for hematite

InactiveCN102773161AHigh recovery rateThe amount of ball grinding is reducedMagnetic separationIronstoneCrushed stone
The invention discloses a magnetic-gravity combined ore dressing technology for hematite, comprising the following steps of: carrying out dry magnetic separation and jigging gravity separation to obtain blast furnace lump ore, throwing the tailings of the lump ore, carrying out first-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation on middlings, and carrying out second-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation. According to the technology, part of qualified blast furnace lump ore (the iron grade is large than 54%) can be obtained in advance, the massive tailings (the iron grade is less than 12%) can be thrown out, the quantity of the ball-milled ore (the middlings) can be greatly reduced, and the grinding and separation energy consumption can be greatly reduced. The massive tailings which are thrown out can replace the macadam and the stone to be taken as the building material, so that the comprehensive utilization of the bulk quantity of the tailings resource can be realized, and the technology is prominent in emission reduction effect; and the whole ore dressing technology is the magnetic-gravity combined ore dressing technological process, so that the flotation reagents can not be consumed, the technology is very friendly to the work environment and the neighboring environment, the environment can be protected, the pollution of the beneficiation reagent to the environment caused by the flotation work can be avoided, and the technology is particularly suitable for the ore dressing of the medium and high-grade (the iron grade is more than or equal to 38%) hematite.
Owner:SINOSTEEL MAANSHAN INST OF MINING RES +2

C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method

The present invention belongs to the technical field of concrete used for a construction material and provides a C30 durable recycled shaping aggregate concrete prepared from construction wastes and a preparation method so as to solve the problems that construction wastes are difficult to recycle in China, the utilization rate of the concrete aggregates in the construction wastes is low, and the durability of the recycled aggregates is poor. The concrete is prepared by mixing cement, fly ash, ore powder, fine aggregates, coarse aggregates, an admixture and water according to a specific proportion, wherein the fine aggregates are a mixture of sand and recycled shaping fine aggregates, the weight of the recycled shaping fine aggregates accounts for 20-100% of the total weight of the fine aggregates, the coarse aggregates are a mixture of gravel and recycled shaping coarse aggregates, and the weight of the recycled shaping coarse aggregates accounts for 20-100% of the total weight of the coarse aggregates. Construction wastes are broken and particles are shaped to obtain the recycled shaping aggregates. On the premise that concrete blending proportion is not changed, natural aggregates are replaced into the recycled shaping aggregates, production costs are reduced, and a great economic benefit is generated. Energy is conserved, a demand for the natural aggregates is effectively reduced, and resources are effectively protected and conserved, thereby realizing environmental friendly construction.
Owner:CHINA SHANXI SIJIAN GRP

Anti-crack enhanced large-volume super-length structural concrete and preparation method thereof

The invention relates to an anti-crack enhanced large-volume super-length structural concrete and a preparation method thereof. The anti-crack enhanced large-volume super-length structural concrete contains the following components in parts by weight: 200-220 parts of cement, 158-170 parts of water, 760-775 parts of medium sand, 1050-1070 parts of macadam, 90-95 parts of coal ash, 60-65 parts of mineral powder, 35-45 parts of a swelling agent and 7-9 parts of a water reducer. The preparation method comprises the following steps: mixing the water reducer with water, so as to obtain an additive solution; mixing the macadam with the medium sand, and uniformly stirring, so as to obtain an aggregate mixture; mixing the cement, the coal ash, the mineral powder and the swelling agent, and uniformly stirring, so as to obtain a rubber material mixture; and mixing the aggregate mixture, the rubber material mixture and the additive solution, and uniformly stirring, so as to obtain the anti-crack enhanced large-volume super-length structural concrete. The anti-crack enhanced large-volume super-length structural concrete prepared by virtue of the formula and the preparation method has the characteristics of being low in hydration heat, capable of resisting heat and high in strength.
Owner:北京铁建永泰新型建材有限公司

Method for manufacturing prestressed concrete tubular pile

The invention relates to a method for manufacturing a prestressed concrete tubular pile, which belongs to the technical field of building engineering materials. The method comprises the following steps of: weighing silicate cement, composite superfine powder, sand, broken stone, water and composite water reducing agent in a ratio, pouring the weighed sand into a stirrer, adding the weighed silicate cement and the weighed composite superfine powder into the stirrer in turn, stirring the mixture, then adding the weighed water into the stirrer, stirring the mixture to form cement mortar, adding the weighed composite water reducing agent into the stirrer, and finally adding the weighed broken stone into the stirrer to obtain concrete; pouring the concrete into a tubular pile die, tensing steel bars to obtain a pre-stressing force, and centrifugally shaping the concrete to obtain the prestressed concrete tubular pile; and finally curing the prestressed concrete tubular pile by steam. The manufacturing method only needs low-temperature and normal-pressure steam curing, and has the advantages of simple production equipment, convenient process control, safe production and operation, saving of production land, reduction of product cost, improvement of production efficiency, reduction of environmental pollution, high compression-resistant push, good impact toughness, high fracture toughness and good durability.
Owner:深圳市同成新材料科技有限公司
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