2307 results about "Crushed stone" patented technology

The invention relates to a burning-free block brick prepared from bulky industrial waste residues. The burning-free block brick is characterized in that the block brick comprises the following raw materials in parts by weight or volume: 10-80 parts of at least one of tailing, magnesium slag, basic slag, mountain flour, cinder, fly ash, coal gangue, oil shale waste and sulfuric acid slag, 0-80 parts of at least one of gravel, waste sand, construction waste, garbage to be burnt, steel slag, mineral slag, copper slag, iron slag with gold, ardealite, phosphorous slag and carbide slag, 0-50 parts of active cementing material, 0-30 parts of cement clinker, 2-15 parts of cement and a defined amount of water. The preparation method of all types of burning-free and steaming-free standard bricks, perforated bricks, hollow blocks, paving tiles, road edge bricks and fence railings which have low cost and high strength, is as follows: proportioning, stirring for 1-6 minutes, adding a defined amount of water to stir, placing in moulds to form in a machine and performing natural curing for 7-28 days. The burning-free block brick has high raw material selectability, simple technology and wide development and application prospects, and is environmental-friendly.

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.

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.

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.

The invention discloses a pervious concrete and is characterized in that the pervious concrete is made by mixing cement, aggregate, water, water reducer agent and adhesive evenly; and the cement, the aggregate, the water, the water reducer agent and the adhesive are mixed in different weight proportions of 1-1.2 to 5.5-8.5 to 0.2-0.5 to 0.01-0.2 to 0.01-0.2. The invention can solve the natural ecology problems of hardened ground in cities, atmospheric circulation as well as soil and water moisture retention, thereby forming a high-quality natural ecology environment and maintaining urban ecological balance. The pervious concrete consists of two pervious surface courses and two macadam bases in different particles so as to provide a water storage structure which can store the water until the water penetrates into the soil; meanwhile, the invention can be made into building block, which can be provided with different decorative patterns and colors on the surface, and has the advantages of artistic quality, water permeability, good water retention, skid resistance, high strength, cold resistance and weather resistance, etc.

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.

The invention belongs to the field of building materials and in particular relates to recycled concrete doped with short-cut basalt fibers and recycled coarse aggregate. The recycled concrete is prepared from the following raw materials in parts by weight: 100-300 parts of water, 300-500 parts of ordinary Portland cement, 500-700 parts of medium sand, 500-650 parts of natural gravels, 500-650 parts of recycled coarse aggregate, 30-50 parts of fly ash, 1-5 parts of a water reducing agent and 1-6 parts of short-cut basalt fibers. The recycled concrete provided by the invention is low in preparation cost, and the obtained concrete has high temperature resistance, corrosion resistance, tensile strength, crack resistance and better durability property.

A tough, high-strength geomembrane made from a custom blend of polyethylene copolymers, for protecting waterproofing courses from impact and pressure damage of debris resting against the waterproof course. A slip sheet configuration reduces surfaces stress due to earth movement and subsurface cracking thereby maintaining the protective course intact without any effect on the waterproofing layers. The geomembrane is available as lightweight rolls which can be easily be handled by one man. The film is installed horizontally in continuous sheets with few adhesive joints. Installation begins by applying a thick brush coat of the selected waterproofing membrane material (usually a rubber coat but may be any waterpoofing material). The film is unrolled along the wall, held up into position and secured using plastic self-sealing plugs and/or plastic termination bars. Concrete nails are used to attach the self-sealing plugs or termination bar to the wall. If termination bar is selected the film is extended up beyond the bar approximately 8'' and folded down over the termination bar after attachment. Staples into the termination bar can be used to hold the film down creating a nicely detailed upper edge.

The present invention provides an open pit coal mine mining process, which comprises the following operation steps: 1, adopting a bucket wheel excavator to dig a loess layer on the upper portion, placing the dug loess onto a conveying belt of a belt type conveyor, and discharging the loess to an outer dump; 2, adopting a single bucket truck to convey crushed stone in a rock layer on the middle portion to the outer dump, and adopting the single bucket truck to convey into an inner dump until a rock layer on the lower portion is exposed after a pit formed by the rock layer on the middle portion has a enough space; 3, adopting a casting-blasting method to blast the rock layer on the lower portion, adopting a bulldozer to flatten the top surface of the blasting stack to form a combination extension platform, adopting a dragline to inversely stack the blasting amount into the inner dump, directly discharging the blasting amount into the inner dump with matching with the single bucket until a coal layer is exposed; and 4, adopting the single bucket truck to convey coal in the coal layer to a crushing plant, and then conveying the crushed coal to a designated location with a belt conveyor.

The invention discloses a method for constructing a tunnel by utilizing a shield empty-pushing crossing mine method. Gravels are paved in advance on an empty-pushing section, thereby being short in construction period; the gravels are stacked and filled in front of a cutter, a counter force is provided when the shield is in a tunneling process, and duct pieces are not fixed by structural steel; most clearances between the duct pieces and rock are filled with the gravels, thereby reducing work load and promoting tunneling efficiency; enough counter force is supplied by a jack for splicing the duct pieces, a water-stopping bar is excellently pasted and a waterproof effect is excellent; the duct pieces can be filled and compacted in time, the duct pieces after being spliced cannot float upward, and damaged and over-loaded staggered slabs do not exist; the grout amount on the back of the duct pieces is reduced and the construction cost is saved; and the tunneling efficiency is greatly promoted, the production value within a unit time is high and the economic benefit is excellent.

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.

The invention discloses a machine-made sand self-compacting concrete. The concrete is made from the following components according to parts by weight: 100 parts of cement, 25-45 parts of fly ash, 0-30 parts of mineral powder, 0.8-1.5 parts of a polycarboxylic acid water reducing agent, 220-250 parts of machine-made sand, 130-150 parts of cobble and 130-150 parts of crushed stone. The concrete saves natural resource as well as has high fluidity, high stability and low slump loss; compared with equivalent effects, the concrete has the advantages of lower cost and simpler production, meanwhile, silicon dust is not applied to the concrete, therefore, the health of operators is better guaranteed.

A constructive water resource recycling method is characterized in that great-sized water reservoirs, each of which has a drainpipe provided above for connecting to the ground surface, are buried in the underground soil; deep drainage trenches are selectively provided under the macadam stratum; the side walls of the deep drainage trenches have water inlets such that the rain can be led down to the soil via drainage bands, while trenches are covered by trench covers; the water contained in the water reservoirs can be drawn by water-drawing pipes to the ground surface for further utilization through a water pump of natural power; the great-sized water reservoirs are covered by soil and macadam stratum, and then an instantly permeable layer which is composed of macadam, pebbles or sand; finally, the instantly permeable layer is covered a concrete pavement and then drilled through to complete a constructive permeable pavement, thereby efficiently recycling the rain for fully utilization.

The invention relates to revetment combination system that has cutoff purifying function to the river rainfall runoff surface contaminating material. It sets non-sand concrete curbstone at the intersection of road and bank slope, a catch water channel is set at one side of intersection road, where coarse sand bedding is paved. Crushed stones are filled in the channel, and the top of channel is sealed by non-sand concrete. On the band slope toward water side paves coarse sand, crushed stone of different thickness, and ecology brick. Cement laid stone masonry breast wall is set at basal slope, and growing plant at the bank slope. It increases the residence time for runoff in the system and takes purification to it.

In this invention, after a hole has been drilled or excavated, injection probe(s) are placed at appropriate depth(s), the excavated native materials are replaced with appropriately sized crushed rock or other natural or synthetic materials, and then a polymeric resin is injected through the probe(s) to encapsulate and bind the fill material, whereby upon curing the polymeric resin and fill material forms a foam friction pile. Such friction piles drilled or excavated adjacent to each other will form a foam sheet piling system. The foam piles can also be re-enforced using nylon, polypropylene, fiberglass, other synthetic or non-synthetic materials or combinations of these materials. The polymeric resin typically would comprise a high density closed cell, water resistant expanding two component polyurethane foam system.

The invention discloses a concrete pile formed by concrete casting; the concrete comprises the components including cementing material, fine aggregate, crushed stones, water-reducing agent and water, wherein the fine aggregate is a mixture of sand and industrial waste slag, and the weight the industrial waste slag is 10 to 50% of that of the fine aggregate; the volume weight of the concrete is 2400 to 2600 kg/m<3>; the use amount of the cementing material is 300 to 600 kg/m<3>, the water-binder ratio is 0.2 to 0.4, and the sand percentage is 27 to 44%; and the weight of water-reducing agent is 10 to 50% of that of the cementing material. The invention further discloses a preparation method of the concrete pile. According to the invention, 10 to 50% of sand is replaced by industrial waste slag, moreover, the resource of the industrial waste slag is relatively ample, and the quality is relatively stable, so that under the premise of ensuring the quality of the concrete pile, through resource utilization of the waste material, not only the pollution problem is solved, but also great economic benefits and social benefits can be produced.

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.

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.

A bastion including one or more free-standing structures for use in, for example, military applications and for force protection. The free-standing structures are made up of a plurality of pivotally interconnected fire resistant mesh covered wire panels and are filled with, for example, sand, crushed rock or granular materials.

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.

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.

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.

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.

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.

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.

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.

The invention relates to a stone-simulating pervious concrete floor and a construction method thereof. The concrete floor includes a tamped foundation, a crushed stone layer, a pervious concrete structural layer and a pervious concrete surface layer from bottom to top; the pervious concrete surface layer is a stone-simulating pervious concrete surface layer, which adopts the following materials and weight ratio: 2100-2300kg/m<3> of river sand; 325-335kg/m<3> of cement; 39-41kg/m<3> of silicon power; 24-26kg/m<3> of Grade I coal ash; 3.4-3.6kg/m<3> of water reducer and 78-80kg/m<3> of tap water. The invention leads the pervious concrete road surface to have water permeability and decoration simultaneously, and improves the water-permeable and air-permeable effect of the concrete road surface on the premise of ensuring the strength of the road surface and having the texture of the concrete road surface.

The invention relates to a production method of a concrete mixture, in particular to a method of producing concrete mixture by using machine-made sand instead of natural sand. The machine-made sand and gravel after being measured are fed into a stirrer to be stirred uniformly, then 70-80 percent of water of the total water is added into the mixture, which is stirred again so as to lead the mixture to become wet; measured cementing materials are put into the stirrer, and the residual water of the total water and concrete additive are added into the stirrer to be stirred uniformly. The concrete mixture prepared by the invention overcomes the defects existed in the concrete mixture which is prepared by employing machine-made sand instead of natural sand with the existing traditional technology, thus improving the property of the concrete mixture which is produced by adopting machine-made sand.

A polymer grouting method for constructing gravel pile for reinforcing the soft and special soil foundation includes steps of: (1) pile-position-pore-forming; (2) installing a grouting pipe; (3) putting graded stones; (4) polymer lifting grouting; and (5) pile-forming. By pile-position-pore-forming, putting graded stones, polymer lifting grouting in the reinforcement site and other steps, the injected two-component expansive polymer material expands rapidly after a chemical reaction, and then is solidified with the graded stones for filling in the pile hole from below to above, the blast hole wall rock-soil is expansive compacted and fully integrating with the surrounding rock-soil, thus forming the polymer gravel pile. The present invention can rapidly reinforce the soft and special soil foundation, thereby providing an advanced, highly efficient, safe and practical method for reinforcing the soft and special soil foundation. It has great economic and social benefits and broad development prospects.

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.