40 results about "Subbase" patented technology

The invention relates to a method for paving cement concrete pavement. The conventional cement concrete pavement is constructed by a method for constructing the cement concrete pavement through fixed templates, and the method has the defects that due to instability of the templates or negligence, the templates are expanded and non-straight,, small broken lines are formed on the templates on a curve, and geometric dimensions are irregular. The method for paving the cement concrete pavement comprises the steps of: (1) clearing and flattening a lower subbase, and controlling the elevation of the subbase to be within the range of a design line; (2) paving cement concrete roads by using a slip-form paver along datum lines on two sides or one side, performing the construction paying off of concrete surfaces, and surveying and arranging paying-off balls by adopting longitude and latitude levels; (3) blending concrete by using a blending station; (4) performing paving by using the slip-form paver; (5) performing exact leveling and fine smoothing through artificial matching; (6) napping and cutting joint; (7) curing; and (8) filling the joint. The method is used for solving the problem of poor quality of the road surfaces in the conventional method for paving the cement concrete road surfaces.

The invention relates to the technical field of construction waste recycling, and particularly discloses a design method of a cement stabilization recycled concrete aggregate (RCA) base or subbase. The design method comprises the steps: step one, determining materials and thicknesses of all structural layers of a pavement structure; step two, establishing a calculating model according to the materials and the thicknesses of all the structural layers, and determining the 7d cleavage strength design criteria and 7d unconfined compressive strength design criteria of the cement stabilization RCA base or subbase according to the calculating model; step three, carrying out the gradation composition design for the cement stabilization RCA on the base or subbase, and calculating and determining the design cement dosage Copt of the cement stabilization RCA, meeting the 7d cleavage strength design criteria and 7d unconfined compressive strength design criteria; the design is passed if Copt is smaller than or equal to 6%; if Copt is greater than 6%, the gradation composition design for the cement stabilization RCA is regulated to enable Copt to be smaller than or equal to 6%. By adopting the method, design is carried out rationally according to the technical nature of the construction waste RCA, the investment cost is low, use and operation are easy and simple, and the use effect is good.

The invention discloses a semi-rigid base asphalt pavement reflection crack testing device. The semi-rigid base asphalt pavement reflection crack testing device adopts the structure as follows: a steel tank is filled with a subgrade, a subbase, a semi-rigid base, a sealing layer and a surface layer are sequentially from bottom to top; a first steel plate and a second steel plate are vertically embedded into the semi-rigid base; a steel tube is horizontally embedded into the semi-rigid base and penetrates through the steel tank; a dowel bar penetrates through one end of the steel tube and is welded to the second steel plate; the other end of the dowel bar is connected with a hollow hydraulic jack through a nut; the bottom of the hollow hydraulic jack is connected with the steel tank through a bolt; a displacement sensor is in horizontal contact with the free end of the dowel bar; a crack meter is embedded into the surface layer. The semi-rigid base asphalt pavement reflection crack testing device is simple in structure and convenient to use, particularly, can control the expansion speed of an semi-rigid base crack by controlling the jacking rate of the hollow hydraulic jack, and can simulate influence of different extension rates of the semi-rigid base crack on an evolution law of the asphalt pavement reflection crack, so that the semi-rigid base asphalt pavement reflection crack testing device enables indoor test accuracy to be higher, more reliable and more effective.

The invention provides a soft foundation silt curing agent which comprises main gel powder, auxiliaries and a liquid agent, wherein the main gel powder comprises cement clinker, slag, lime, sulfate and vermiculite powder; the auxiliaries include an accelerator, an auxiliary gelling agent, an early strength agent and a water reducing agent; the liquid agent comprises polyacrylamide, polyaluminum chloride, mannitol, lignosulfonate, alkylphenol polyoxyethylene ether, tannic acid and alpha-olefin sulfonate; the accelerator is water glass; the auxiliary gelling agent is one or a mixture of two of fly ash, silicon ash and aluminum ash; the early strength agent is a mixture of sodium sulfate, aluminum sulfate and triethanolamine; and the water reducing agent is a naphthalene high-efficiency water reducing agent. By adopting the soft foundation silt curing agent provided by the invention, the problem that the silt is hard to cure due to the high organic content is solved, the silt strength is greatly improved, and the pavement performance of the silt is improved so as to meet the construction requirements as pavement subbase course and base course packing.

The invention provides a method for stabilizing a subgrade by adopting a soil stabilizing agent. The method comprises the steps of mixing materials comprising a strong oxidant, a dispersing agent, an ionic polymer activating agent and a stabilizing catalyst together to prepare the soil stabilizing agent; preparing the selected subgrade material according to the soil with the plasticity index of 7-35; diluting the soil stabilizing agent in water in a volume ratio of (1:100)-(1:200), and simultaneously adding 3-20 of carbide slag, 3-12 of lime or 2-8 of cement to the subgrade material according to the earthwork weight ratio to be mixed; spraying and compacting: computing the volume ratio (generally 0.016-0.02%) of the prepared soil stabilizing spray solution according to the earth volume of compacted soil, converting the volume ratio to weight ratio when adding the usage amount, spraying the soil stabilizing agent with density of 1.7-1.75g/cm<3> into the soil used for the subgrade, and forming the subgrade through compaction. The method has the advantages that harmful substances can not be produced; the method is simple in construction technology, is convenient to operate, is favorable for reducing the construction amount, is high in soil stabilizing speed, has good effects, conduces to greatly shortening the construction period, is more suitable for the characteristics of local soil properties, and has more obvious stabilizing effects.

The invention discloses a structurally integrated cement stabilized gravel base layer or subbase layer design method. The method includes steps: working out a pavement structure combination; establishing a calculation model, and determining an age and modulus of each structural layer in the model; calculating a bottom layer tensile stress of a cement stabilized gravel base layer or subbase layer; determining a 7d compressive strength design standard [Rc7] and a 7d splitting strength design standard [Rs7]; designing mineral aggregate gradation; determining a maximum dry density Rhomax and an optimum water content wo of a cement stabilized gravel mixture material; testing a 7d unconfined compressive strength Rc7 and a 7d splitting strength Rs7, and determining a cement addition quantity which meets requirements that Rc7 is larger than or equal to [Rc7] and Rs7 is larger than or equal to [Rs7], so that designing is completed. The method has advantages of low input cost, simplicity and convenience in use and operation, great utilization effects and effectiveness in solving of problems of disjunction with pavement structures and proneness to shrinkage cracking of existing cement stabilized gravel design.

The invention relates to a water-cooling pedestal, which comprises an upper plane, a lower plane and a molten steel injection hole, wherein the pedestal has a concave middle section. An upper cooling chamber and a lower cooling chamber are arranged inside the pedestal between the upper plane and the lower plane and are respectively composed of more than one layer of cooling pipes, and the pipe mouths on both ends of the cooling pipes are exposed for allowing cooling water to flow into or flow out of the cooling pipes. The water-cooling pedestal is arranged between a steel ingot mold and a steel ingot disc and has the following advantages and usage effects: (1) the upper cooling chamber is used to substitute for a high-temperature region that can be easily damaged by burning at the middle or the lower section of a conventional steel ingot mold to solve the failure problem of local melting loss of the steel ingot mold and reduce the cost of the steel ingot mold; (2) the lower cooling chamber is used to substitute for a high-temperature region that can be easily damaged by burning around the injection holes of the prior steel ingot disc to prevent the steel ingot disc from contacting high-temperature molten steel and to achieve a melting-loss-free work state and prolong the service life of the steel ingot disc; and (3) the problems of molten steel leakage and breakout are solved to ensure the procedure quality.

The invention discloses a construction method for a subbase layer of a natural graded pebble road surface, comprising the following processing steps of: 1, lower bearing layer preparation: performing testing, measuring and lofting on a road bed and dividing distributing grids; 2, natural graded pebble paving: paving natural graded pebbles according to the design thickness and the coefficient of a loose paving material, and performing primary leveling and static press; 3, binder paving: paving 5-7 cm of rock powder in thickness and 2-3 cm of clay in thickness on the surface of a pebble layer; 4, blending: blending clay, rock dust and the natural graded pebbles together 2-3 times; 5, rolling: performing fine leveling by using a land leveler, performing static press 1-2 times by using a road roller and performing vibrational rolling 6-8 times; and 6, testing: testing compactness and a rebound deflection value. By mixing of the binder of rock dust and clay in the invention, the biting force, stability and hardening property of the natural graded pebbles are increased without performing crashing, plant mixing or site mixing on the natural graded pebbles nor performing secondary carrying, and the construction cost is reduced.

The invention discloses a structural layer thickness design method for a mixed base course cement concrete pavement. The structural layer thickness design method comprises the following steps that the comprehensive equivalent weight rebound modulus of a plate bottom foundation is calculated; the equivalent bending rigidity and the equivalent thickness of a mixed base course are calculated according to situations of a rigid base course and a semi-rigid subbase course and the rigid base course and a soft subbase course; load stress, load fatigue stress, a interlayer contact condition parameter, vertical contact rigidity, the maximum temperature stress, the temperature fatigue stress and the like are calculated according to the calculation results of the equivalent bending rigidity and the equivalent thickness through an elastic foundation doubling plate model; structural limiting state is checked, the situation that no limit breakage occurs is taken as a checking standard, and whether the drafted structural layer thickness meets requirements or not is determined. The problems of unnecessary waste and early serious damages caused by the unreasonable structural layer thickness design of the mixed base course cement concrete pavement can be effectively avoided, and the method has good social and economic benefits.

The invention relates to an elasticity controlled supporting wheel for a funabout. The elasticity controlled supporting wheel comprises a connecting strut, wherein an external thread is formed in the upper part of the connecting strut, and a main basal block is fixedly connected to the lower part of the connectinn strut; a subbase block is hinged to the lower part of the main basal block, and a roller is mounted at the lower part of the subbase block; side flap boards are respectively connected to the left side and the right side of the main basal block in a hinged manner, through holes are formed in the side flap boards, and a pin strut is arranged in each of the through hole in a penetrating manner; the lower ends of the pin struts respectively penetrate through the subbase block on the corresponding side. According to the elasticity controlled supporting wheel disclosed by the invention, butterfly spring pieces are used as shock absorption elements, and the main basal block, the side flap boards and the subbase block which are in mutual connection in the hinged manner are combined, so that a supporting wheel having large carrying capacity, strong shock absorption effect and high-dimensional stability is jointly formed. When the supporting wheel is mounted, the supporting wheel can be movably connected to an automobile body so as to be used as a universal wheel, so that the working flexibility of the supporting wheel is further improved.

The invention provides a pavement structure based on a biological enzyme soil (enzyme soil for short) solidified base layer, a subbase layer (base layer for short) and biological enzyme, rubber powder, fiber (multi-element for short) three-times (multiple-times) modified roller compacted concrete pavement. The pavement structure comprises a subbase layer (3), a base layer (2) and a surface layer (1), wherein the base layer (2) is paved on the subbase layer (3), the surface layer (1) is paved on the base layer (2), the subbase layer (3) and the base layer (2) are stable layers (enzyme soil solidified base layer for short) formed by solidification of the biological enzyme soil solidified base layer, and the surface layer (1) is a layer formed by multi-element multi-time modified roller compacted concrete. The invention aims to provide a novel pavement structure. A road pavement formed by using the pavement structure has the performance advantages of high toughness, impaction resistance, cracking resistance, sliding resistance, abrasion resistance, inflaming retardance, noise reduction, and the like, and is easy to maintain. According to the pavement structure, the riding comfort can be effectively improved, the riding environment is improved, and the use performance of a road is enhanced.

The invention relates to a powdery soil curing agent for curing road base course and subbase course, and the powdery soil curing agent is applied to curing of soft base, paving, foundation engineering and seabed foundation construction engineering. The powdery soil curing agent comprises the following substances in parts by weight: 27-42 parts of potassium chloride, 33-51 parts of sodium chloride, 30-48 parts of magnesium chloride, 3-12 parts of sodium sulfide, 15-27 parts of calcium chloride, 0.02-0.1 part of combined biological enzyme and 1-8 parts of sodium triphosphate. Compared with a road constructing technology by adopting cement and lime in the prior art, the powdery soil curing agent provided by the invention has the capabilities of remarkably reducing the cost of construction, effectively relieving the problem of huge road construction fund gap, saving resources, reducing discharge of CO2 and effectively solving the problem of damage to ecological environment caused by road construction.

The invention relates to a retractable type aircraft damping mechanism, comprising a retaining ring, a telescopic cylinder, a subbase, installation columns and damping springs. Through holes are formed in the retaining ring and the subbase, the upper end of the telescopic cylinder is connected with the retaining ring, the lower end of the telescopic cylinder is connected with the subbase, the damping springs are uniformly distributed on the outer side of the telescopic cylinder, the upper ends of the damping springs are connected to the lower end face of the retaining ring though the installation columns, and the lower ends of the damping springs are connected to the upper end face of the subbase through the installation columns. The retractable type aircraft damping mechanism is retracted under the effect of gravity and recoil force, thus the shaking force transmitted to the aircraft per se is effectively reduced, aerodynamic damping and spring damping are applied to the retractable type aircraft damping mechanism, the structure is simple and the damping effect is good.

The invention discloses a sliding filling block for accurately positioning a large part. The sliding filling block is characterized in that: a disc-shaped cavity is formed by fixedly connecting a subbase and a middle ring sleeve into a whole; a bottom plate is arranged in the disc-shaped cavity; balls are arranged on the upper plane of the bottom plate; an upper sliding plate supported by the balls is fixedly connected with a top platform to form a whole; and the periphery of the top platform is fixedly connected with ring side plates which realize the annular limiting of the subbase and the middle ring sleeve. The sliding filling block is applied to positioning and correction in a preparation procedure before the machining of a large rack, avoids the distortion and deformation of the rack by decreasing a friction force between the rack and a hard filling block in a pushing process, and reliably ensures the product quality of subsequent machining.

The present invention discloses a lime-stabilized clay recovered powder mixture including the following components by weight: 60-90 parts of clay, 10-40 parts of recovered powder, 8-15 parts of lime, and water, the mass of the added water accounts for 5-20% of the total mass of the clay, the recovered powder and the lime. The lime-stabilized clay recovered powder mixture has the following characteristics: 1, 7d unconfined compressive strength fully meets the standard requirements; 2, the compressive modulus of resilience is higher than that of ordinary lime-stabilized soil; 3, the volume stability is better than that of the ordinary lime-stabilized soil; with the increase of the recovered powder mixing content, reduction extent of the drying shrinkage of the product reaches 20.8-60.5%, and can effectively inhibit cracking caused by drying shrinkage. The lime-stabilized clay recovered powder mixture reduces the recovered powder deposition occupied land resources, protects environment, and can save the engineering materials and reduce project cost. In addition, the preparation and application technology of the lime-stabilized clay recovered powder mixture is same as the subbase process, and is convenient in popularization and application.

The invention discloses a method for designing once-through dense water-stable crushed stone subbase and base mixture ratio, which is characterized in that the method comprises the following steps: step 1, the subbase adopts unified gradation, which conforms to the recommended range; step 2, the subbase adopts unified gradation. 2, a gradation with better compactness is selected in accord with compaction; 3, a dosage of cement is selected for testing cover that subbase and the base; 4, determine that optimum water content and the standard maximum dry density; 5, for that test piece and the compaction standard is unified to 98 percent; 6, that subbase and the cement dosage of the base are synthetically determined based on various circumstance. The invention can save more than 50% of the test workload, shorten the design period of the mixture ratio, and realize the advance of the project commencement time. Added the compactness judgment link, the method is more scientific; does not add instruments and equipment, nor special instruments; Subbase, base used share same stone specifications for preparation. Therefore, the water-stabilized crushed stone design method of the invention is easier to be popularized and applied in engineering.

This instant disclosure provides a manufacturing method of circuit pattern. The method comprising, providing a substrate; making a metal material be attached to the substrate for obtaining a circuit subbase layer on the substrate, wherein the circuit subbase layer is a curved surface along the surface of the substrate; making an anti-coating layer on the circuit subbase layer; executing a patterned processing to the anti-coating layer to make the anti-coating layer become an antenna pattern on the substrate; etching the circuit subbase layer to make the metal material uncovered by the anti-coating layer be removed from the surface of the substrate for making the circuit subbase layer to form the antenna pattern; removing the anti-coating layer to expose the circuit subbase layer forming the circuit pattern. Therefore, the manufacturing quality of the circuit pattern can be improved and the associated cost can be saved.

The invention relates to an intelligent integrated solar energy navigation mark lamp, which is comprised by lamp lens, subbase and function control module. It is characterized in that: the function control module is comprised by solar cell, maintenance-free accumulator, LED electric light source, lamp control module, satellite positioning and wireless communication module, electric detection module, the said all function modules are connected via bus and are integrated and sealed together in the lamp comprised by the lamp lens and the subbase. The invention utilizes wireless networks to transfer satellite positioning signal and network positioning correcting signal, and transmits accurate positioning information and navigation mark lamp electric parameter obtained by the electric detection module to control center via wireless network. The invention has advantages of simple and compact structure, perfect performance, low energy consumption, convenience for maintenance, low construction and maintenance cost, thus, it is widely applicable for sea-route management field.