31results about How to "Overcome the disadvantage of low strength" patented technology

The invention discloses a preparation method of high-strength fully-recycled coarse aggregate concrete, belonging to the technical field of recycled coarse aggregate concrete. According to the preparation method, a proper amount of superplasticizer, first-level coal ash and mineral powder are added at a water-gel ratio of 0.36-0.44 to prepare the high-performance fully-recycled coarse aggregate concrete which is good in working property, high in early-stage strength and good in later-stage strength development. The strength of the existing fully-recycled coarse aggregate concrete is low, and the compression strength of the fully-recycled coarse aggregate concrete provided by the invention is over 50Mpa according to actual measurement in 28 days.

The invention discloses a rock coarse fracture seepage simulation model and a making method. The rock coarse fracture seepage simulation model comprises a fracture main board, a left mounting board, a right mounting board, an upper mounting board and a lower mounting board, the fracture main board is of a cuboid structure, a hydrophobic area is arranged on one side of the cuboid structure, a water gathering area is arranged on the other opposite side, the hydrophobic area is communicated with the water gathering area, the outer side of the hydrophobic area is matched with the left mounting board, and the outer side of the water gathering area is matched with the right mounting board; the upper surface and the lower surface of the cuboid structure are respectively matched with the upper mounting board and the lower mounting board, and a pressure measuring hole communicated with a communicating area between the hydrophobic area and the water gathering area is formed in the upper mounting board. 3D printing technology is adopted to manufacture the fracture main board which is fixed through the upper, lower, left and right mounting boards, and a bolt or a water pressure sensor is mounted on each mounting board, so that the making method of the rock coarse fracture seepage simulation model is simple to make, convenient to experiment and capable of reflecting rock fracture seepage characteristics more really and more accurately.

The invention relates to a splicing-type primary support method for a tunnel. Therefore, constructions in special sections of weak geological conditions can be effectively supported when a shield method for construction is not adopted for tunnels excavated by a mining method and primary support of underground construction. The splicing-type primary support method comprises an overall support and partial excavation support and is characterized in that based on a tunnel section form, a support member is divided into multiple blocks; on the site, the multiple blocks are attached to the excavation surface for splicing into a ring so that surrounding rock deformation is controlled; in the method of partial excavation support, rings are formed by partial excavation so that overall connection is formed. The surrounding rocks are supported timely and deformation is controlled. The working environment is improved. The primary support time is shortened and safety coefficients of the working surface construction are improved. Stress is more uniform. The construction quality of a water-proof layer is ensured. Mechanical installation is achieved and high efficiency is obtained. The splicing-type primary support method is used more flexible and has a broad application scope. The support cost is low.

The invention provides a polypropylene non-woven fabric and a making method of the polypropylene non-woven fabric. The molecular weight distribution index of polypropylene in the polypropylene non-woven fabric is 2.5-5.5, and the high molecular trailing index PIHT in molecular weight distribution width is greater than 1.9. The polypropylene non-woven fabric has high strength.

The invention discloses a multi-channel time delay Doppler two-dimensional partition mapping multi-satellite and multi-time image enhanced imaging device, wherein a navigation satellite, an imaging device and an earth surface reflection surface form a reflection surface imaging system. A satellite direct signal is received by a right-handed antenna of a receiver, and a satellite reflected signal is received by a left-handed antenna of the receiver. When the satellite is in the range of field of vision of the receiver, specular reflection points of the satellite signal are tracked by the corresponding left-handed antenna to acquire signals, and a signal acquisition region forms a band. According to the imaging device, a plurality of satellites can be tracked at the same moment to form a plurality of bands, the bands formed by tracking each satellite signal have an overlapped region; and the device is used for processing each satellite signal acquired from the overlapped region, and the band region is imaged by utilizing reflection surface characteristic information included by the reflected signal.

The invention relates to a hogging moment rebar suspension construction control protection layer device and a construction method thereof. The device comprises tripod supporting bases, a horizontal fixing beam and a fixation binding line. The method includes the following steps that firstly, the thickness of a cast-in-place concrete plate is determined; secondly, the position and the use number of tripod supporting bases are determined and the tripod supporting bases are manufactured in batches; thirdly, the tripod supporting bases are placed in the middle of adjacent hogging moment rebar; fourthly, the horizontal fixing beam is arranged on the tripod supporting bases in an erected mode; fifthly, the hogging moment rebar is suspended on the horizontal fixing beam through the fixing binding line to be bound and fixed; sixthly, the surface of concrete on the lower portion of the horizontal fixing beam after casting is floated; seventhly, after concrete reaches the design strength, the upper portion horizontal fixing beam is detached. Compared with the prior art, the hogging moment rebar suspension construction control protection layer device and the construction method of the hogging moment rebar suspension construction control protection layer device have the advantages that the structure is simple and light, the device is convenient to use and low in investment cost and the situation that the position of the stressed rebar in a concrete structure is accurate and the thickness of the hogging moment rebar protection layer conforms to the requirements is effectively ensured.

The present invention discloses the preparation process of microcapsule containing Hansa yellow 10G electrophoresis liquid, and belongs to the field of the preparation technology of electronic ink microcapsule. The preparation process includes: adding Hansa yellow 10G into solvent including toluene to compound dispersant solution and adding surfactant including Span-80 and grinding to prepare suspended electrophoresis liquid; compounding water solution of gelatin and Arabic gum separately; mixing the suspended electrophoresis liquid and epoxy resin to form homogeneous dispersant liquid, dispersing the dispersant liquid into water solution of Arabic gum, adding water solution of gelatin, dropping acid to regulating pH and to take re-condensation reaction, cooling, adding formaldehyde or glutaraldehyde for cross-linking solidification, adding CMCNa, dropping NaOH to regulate pH, and heating to react to obtain the microcapsule containing Hansa yellow 10G electrophoresis liquid.

The invention discloses a method for preparing high-strength semi-regenerative coarse aggregate concretes, and belongs to the technical field of regenerative coarse aggregate concretes. The preparation method comprises the step of preparing the high-performance semi-regenerative coarse aggregate concretes with good working performance, high early strength and good development in long-term strength by regulating the mixing amount of additives, mineral powder and coal ash in reference to the using amount of rubber materials of the common concretes.

The invention relates to a nanostructured pure titanium plate preparation method which includes the following phases: (1) selection of titanium powder particles, to be more specific, low oxygen and low hydrogen high purity titanium powder particles are selected, and the titanium powder particle size distribution range is 5-200 microns; (2) preparation of a pure titanium plate blank by high speed spray deposition method, to be more specific, titanium powder particles are accelerated, by collision of the high speed titanium powder particles and a substrate, a pure titanium plate blank is prepared by deposition caused by strong plastic deformation of the titanium powder particles; (3) plate blank heat treatment, to be more specific, and heat treatment of the prepared pure titanium plate blank is performed; and (4) hot rolling. The crystalline grain size of the pure titanium plate prepared by the method is small, the crystalline grain is nanocrystalline, uniform in organization, and excellent in performance, the shortcoming of low strength of the pure titanium plate is overcome, the hardness is 2 times greater than that of ordinary pure titanium plates, at the same time, the advantages of excellent corrosion resistance, heat resistance and biocompatibility and the like of the ordinary pure titanium plates are inherited. The nanostructured pure titanium plate preparation method is simple in process, good in controllability, and high in production efficiency, and helps to industrial application.

The invention discloses a martensitic stainless steel seamless steel tube for oil and gas exploitation and a manufacturing method thereof. The seamless steel tube comprises, by weight, 0.20% to 0.60% of C, 0% to 1.00% of Si, 0% to 1.00% of Mn, 12.0% to 14.0% of Cr, 0% to 0.01% of S, 0% to 0.02% of P, 0% to 0.60% of Ni and the balance iron and unavoidable impurities. The manufacturing method includes the main steps that molten steel is smelted firstly according to chemical components, a billet is formed by the molten steel in a pouring mode and forged to be a solid circular tube blank, then the circular tube blank is extruded to be a seamless steel tube in the required specification, and the high-strength, high-tenacity and corrosion-resistant martensitic stainless steel seamless steel tube meeting the use requirement can be obtained after the tempering process and the follow-up finishing process.