39results about How to "Improve overall strength-to-weight ratio" patented technology

The invention discloses a preparation method of an organic and inorganic wood composite material, relating to the preparation method of a composite material and solving the problems that the wood composite material prepared by the traditional method has poor durability and mechanical property. The method comprises the following steps of: firstly, pre-polymerizing a monomer; secondly, preparing dilute sol; thirdly, impregnating the wood with the dilute sol under the vacuum-pressurizing condition; and fourthly, heating the impregnated wet wood to obtain the organic and inorganic wood composite material. The organic and inorganic wood composite material has higher strength-to-weight ratio; and compared with the wood, the hardness, the wearing resistance, the bending strength, the elastic modulus, the parallel-to-grain compressive strength and other mechanical properties of the organic and inorganic wood composite material are improved by 5 times to maximum extent; and the dimensional stability and the antiseptic property of the organic and inorganic wood composite material are improved by over 50-70 percent. In addition, the duality test shows that the thermal stability and the weather resistance of the organic and inorganic wood composite material are remarkably improved.

The invention discloses a plastic-coated wooden building template and a preparation method thereof, which relate to a building template and a preparation method thereof and mainly solve the problems that a high-cost performance building template prepared by the current preparation method is low in turnover times and poor in mechanical properties. The preparation method comprises the following steps: firstly, manufacturing a core plate by using a waste template; secondly, manufacturing a polyolefin veneer coated with non-woven fabric; thirdly, gluing double sides of a wood veneer, putting the wood veneer between the polyolefin veneer coated with the non-woven fabric and the core plate, with the same operation for upper and lower surfaces; and finally, pressing. The turnover times of the plastic-coated wooden building template is as high as 30-35 times, which is 10-17% higher than that of the current building template, so that the using cost of the plastic-coated wooden building template is reduced; the plastic-coated wooden building template has the bending strength of 52-55 MPa and an elasticity modulus of 6050-6210 MPa; the plastic-coated wooden building template is high in strength and good in toughness; the preparation method is simple, low in cost and easy to implement, and is applicable to large-scale popularization and application; and the plastic-coated wooden building template has relatively high economic and social benefits and can be applied to the building engineering.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge comprises bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), transverse pre-stressing tendons (4) and longitudinal pre-stressing tendons (16), the outer surface of a bamboo is sequentially and uniformly coated with a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resorcinol formaldehyde resin, and the expansion coefficients of the four coating layers are sequentially lessened from the outer surface of the bamboo to outside. The assembly type bamboo bridge provided by the invention has the advantages that the structural strength is large, the ductility is good, a selected material is environment-friendly, standardization degree and assembling degree of structural members are high, the structural integrity is good, the advantages of the material can be fully expressed, and the requirements on normal use and durability of a bridge structure can be met.

The invention discloses an external mounting type aviation electric pod. The external mounting type aviation electric pod comprises a pod core and a shell. The pod core is arranged in the shell. High-automation-degree operating design is adopted for the external mounting type aviation electric pod. All operation actions can be completed just through one pilot in a part-time job manner, and therefore the pod can be used for all aircraft with a single seat and multiple seats. Because no hydraulic and air compression systems are arranged, mechanical transmission parts are reduced by 80%, mechanical abrasion is greatly reduced, and the system is single and simplified; rolling of a winch and cable distributing and dragging winding and unwinding speed control precision can be improved, and therefore the fault rate is greatly decreased; and because a cable dragging automatic locking device is arranged, part of cable dragging force is transmitted to a pod body structure, loads on the winch are relieved, and using reliability is greatly improved. A more advanced thin-shell structure is adopted for a pod body, the ratio of strength to weight and the material utilizing rate are greatly increased.

The invention belongs to the field of civil engineering and discloses a method for compound reinforcement of a wooden beam. The method is characterized in that at the bottom of the wooden beam (1), fiber cloth (3) is adhered, a base layer (5) is arranged, a bamboo board (2) is adhered and a round bolt (6) is screwed to achieve compound reinforcement of the wooden beam (1). In the method, the bamboo board (2) is used as a reinforcing material, meanwhile the fiber cloth (3) is mechanically anchored, the bonding effect of the bamboo board (2), the fiber cloth (3) and the wooden beam (1) is strengthened through fusion of the round bolt (6) with the bamboo board (2) and the wooden beam (1), and the thickness of epoxy resin glue (4) between the bamboo board (2) and the wooden beam (1) is ensured by arranging the base layer (5) embedded with a solid filling (51). By the adoption of the method, the probability of untimely damage due to bonding layer failure in the wooden beam bending process is reduced, the wooden beam is reinforced by adopting two low-carbon environmentally friendly materials, respective advantages of the two materials are fully played, the bearing capability of the wooden beam is improved, and an original style and features of an old historic building structure restored as the old are achieved.

The invention relates to a preparation method of a wood-like wood-plastic composite sheet material. The preparation method solves the problem that the existing wood-plastic material has a low strength-weight ratio, a high cost and small breadth. The preparation method comprises the following steps of paving bamboo poles and plastic powder in a mold layer upon layer, carrying out hot pressing molding, carrying out cooling, and carrying out demolding. The wood-like wood-plastic composite sheet material is prepared from waste, thin and short bamboo poles and waste and old plastic, has the advantages of simple processes, low cost, large product breadth, low density, high strength, high elastic modulus and creep resistance, and can solve the problem that wood can produce hygroexpansion easily. The preparation method can be used in the fields of house, bridge, vehicle and ship manufacture.

The invention provides a novel energy-saving bamboo bridge. The novel energy-saving bamboo bridge comprises longitudinal bamboo beams (1), transverse bamboo beams (2), bamboo panels (3), transverse pre-stressed trusses (4) and longitudinal pre-stressed trusses (16). A layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resorcinol formaldehyde coat the outer surfaces of all the bamboo materials of the bamboo bridge in sequence. The bamboo bridge further comprises lighting devices and a brightness sensor, and the lighting devices are controlled to be started through the numerical value measured by the brightness sensor. The novel bamboo bridge can start the lighting device according to the brightness and save energy sources.

The invention provides a building template with a high cost performance and a preparation method thereof, relates to the building template and the preparation method thereof and mainly solves the problems that the existing waste template cannot be regenerated and reused, a wood template is not easy to de-mould in a use process and the turnover time is low. The product is formed by respectively sticking one layer of a sticking layer on each one of upper and lower surfaces of a core plate. The method comprises the following steps of: taking nails and sorting the waste templates; vertically cutting; leveling; transversely combing, and vertically connecting and combing; transversely splicing; filling holes; drying; sanding double faces with a fixed thickness to prepare the core plate; preparing a non-woven fabric polyolefin sticking face; coating an adhesive on a non-woven fabric of the non-woven fabric polyolefin sticking face; and coating on the upper and lower surfaces of the core plate, and pressing to finish. The building template with the high cost performance disclosed by the invention adopts the core plate made of the waste template, solves the regeneration and reutilization problems of the waste templates, and greatly improves the cost performance of the building template; and the property that the surface activity of the polyolefin sticking face is low is utilized, the template is easy to de-mould, and the turnover time is high.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge consists of bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), a transverse pre-stressing tendon (4) and a longitudinal pre-stressing tendon (16). All bamboos used by the assembly type bamboo bridge are soaked in a gum dipping tank which contains polyurethane resin and phenolic resin before being assembled, and boiled for 10-15 minutes at 100 DEG C-110 DEG C, wherein the volume ratio of the polyurethane resin to the phenolic resin is (2-2.5):1; and then, the bamboos are got out and dried, and a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resurcinolformaldehyde resin are uniformly coated on the outer surfaces of all bamboos in sequence. The assembly type bamboo bridge is large in structural strength, good in drawability, green and environment-friendly in used materials, standard in structural components, high in assembly degree, good in structural integrity, and capable of sufficiently bringing the advantages of the materials into play, and satisfying the normal use and durability needs of the bridge beam structure.

The invention discloses a basalt type continuous fiber coiled and reinforced bamboo-wood combined pipe. The pipe comprises inner fiber reinforced resin, single-board laminated timber and/ or bamboo, medium fiber reinforced resin, another single-board laminated timber and/ or bamboo, and a surface fiber reinforced resin which are sequentially coiled from inside to outside; the fiber reinforced resin is resin soaked basalt fiber, glass fiber, aramid fiber and carbon fiber; the bamboo is one or a plurality of bamboo strips, bamboo plates, spliced plates, bamboo splits and expanded bamboo; the single-board laminated timber is one or a plurality of poplar, eucalyptus, birch, cedarwood, masson pine and pinus sylvestris. With the adoption of the pipe, the cost is greatly reduced, the density is reduced, and the ratio of strength to weight is obviously increased.

The invention relates to a tatami, which comprises a core layer arranged at the middle part, a folding surface arranged on the upper surface, a piece of anti-skid cloth arranged on the lower surface, a bottom liner arranged between the core layer and the anti-skid cloth, and an elastic layer arranged between the core layer and the folding surface. The core layer is of a wheat straw plate. The wheat straw plate comprises pulverized paddy straw and wheat straw adhered by isocyanate pitch adhesive and then molded. The tatami performed according to the invention has the advantages of low production cost, environmental protection, and no harm to the human body. The straw plate is uneasy to be wetted, therefore, the distortion is unable to produce, and the straw plate is mildew proof and vermin proof. The straw plate has higher strength and weight ratio, thereby the tatami performed according to the invention has light weight, high strength, and no extra reinforced layer is needed.

The invention discloses a microcrystalline foamed wall block prepared by using polishing powder. The wall block is prepared from the following raw materials in parts by weight: 70-90 parts of microcrystalline frit, 12-25 parts of mineral raw materials and 2.5-10 parts of chemical raw materials; the microcrystalline frit is prepared from the following raw materials in percentage by mass: 60-80% ofpolishing powder, 15-25% of ore powder and 5-17% of ingredient powder. By adjusting the formula and improving the preparation process, the microcrystalline foamed wall block with significantly improved compressive strength, good thermal insulation performance and high fire resistance is prepared, and the requirements of building materials for energy saving, environmental protection, high strengthand fire protection can be better met.

The invention provides a novel optical cable for communication between underwater equipment and equipment in a cabin body, which is light in weight, easy to bend, good in water resistance, wear resistance, oil resistance, low-temperature flexibility and flame retardance, and capable of realizing rapid wiring and repeated folding and unfolding use. A central reinforcing member, a loose tube, a wrapping tape, an inner sheath, an aramid fiber braid layer and an outer sheath are sequentially arranged at the radial center of the cable from inside to outside. The central reinforcing member is an aramid fiber extrusion molding flame-retardant sheath. Optical fibers are distributed in an inner cavity of the loose tube. Internal spaces of the optical fiber and the loose tube are filled with fiber paste. The loose tube is twisted around the central reinforcing member to form an equivalent circular cable core, the wrapping tape wraps an equivalent outer ring of the cable core, the inner sheath wraps an outer ring of the wrapping tape, the aramid fiber braid layer is annularly distributed on the outer ring of the inner sheath, and the outer sheath wraps the outer ring of the aramid fiber braidlayer.

The invention provides an operation method of a PET wood-plastic composite manufacturing device, belongs to the technical field of composite preparation methods, and particularly relates to an operation method of a PET wood-plastic composite manufacturing device. The method is used for manufacturing PET wood-plastic composites with interlayer structures and comprises the steps that S1, a control device is powered on to be started, and a main extrusion device is started; S2, an auxiliary extrusion device is started; S3, prepared main materials are added into a feed hopper; S4, prepared auxiliary materials are added into an auxiliary feed hopper; and S5, operation for extrusion machining and post-machining is carried out. The device is provided with the control device, the main extrusion device, the auxiliary extrusion device and a mold head, wherein the main extrusion device and the auxiliary extrusion device are connected through the mold head. By adoption of the operation method of the PET wood-plastic composite manufacturing device, wood-plastic composites and products can be manufactured conveniently and efficiently.

The invention discloses a composite rib reinforced ECC-composite square steel tube hollow column. The composite rib reinforced ECC-composite square steel tube hollow column comprises a composite square steel tube assembly, an external ECC and a composite rib cage, wherein the composite square steel tube assembly comprises four square steel tubes arranged in a shape like a Chinese character 'Tian', the external ECC is wrapped with the composite square steel tube assembly, the composite rib cage is arranged in the external ECC, the composite rib cage is formed by connecting longitudinal ribs and FRP stirrups, the longitudinal ribs are in lap joint with the inner sides of the FRP stirrups, the longitudinal ribs are perpendicular to the plane where the FRP stirrups are located, the composite rib cage and the external ECC form an outer protective layer, the ratio of the thickness of the external ECC to the length of the outer side of the composite square steel tube assembly is 0.5, and the distance between the surface of the external ECC and the axes of the longitudinal ribs is not smaller than 35mm. The hollow column is high in strength-to-weight ratio, and the square steel tubes are hollow, so that the structure meets the strength requirement with a small section; and the composite square steel tube assembly formed by combining the four square steel tubes is improved in bearing capacity and rigidity compared with a single square steel tube. In addition, the composite rib reinforced ECC-composite square steel tube hollow column has the advantages of being excellent in anti-seismic property, high in durability, good in fire resistance and the like.

The invention discloses a stacked corrugated annular stretching structure and a process thereof. The stacked corrugated annular stretching structure is formed by annularly unfolding n corrugated units along a covering film, covering a panel and fixing. The hollow corrugated unit is formed by stacking n + 1 plane base bands and n corrugated base bands, an auxiliary plate is glued and pressed on the plane base band on the outermost side of the stacked corrugations, and a covering film is pasted on the surface of only one side. When in use, the auxiliary plate is annularly stretched and unfolded along the covering film and is combined and fixed. The stacked corrugated annular stretching structure is characterized in that the n corrugated units are in a radial shape and are perpendicular to the ground to support the panel, and the middle of each corrugated unit is a hollow cylinder. The forming method comprises the following steps that S1, the stacked corrugations are prepared; s2, glue pressing, drying and shaping; and S3, pasting a side film. The unfolding method comprises the following steps that S1, the auxiliary plate is annularly unfolded, combined and then fixed; s2, fixing the seat surface;