30results about How to "Make up for shrinkage" patented technology

The invention discloses a construction method of shear resistance and strengthening of concrete box beams based on corrugated steel webs. The construction method successively comprises the following steps: performing construction lofting and positioning on top plates and bottom plates of box beams; performing and strengthening bonding surfaces; drilling anchor bolt holes in the bottom surfaces of the top plates of the box beams; drilling holes and planting steel bars in the top surfaces of the bottom plates of the box beams; performing laying-off on the corrugated steel webs; drilling holes and performing polishing on upper flange plates; welding and mounting the corrugated steel webs; mounting reinforced mesh slices; erecting a model and pouring concrete. The construction method disclosed by the invention has the advantage that the purposes of shear resistance and strengthening of the concrete box beams are achieved by mounting longitudinal corrugated steel web components in box chambers of box beams, increasing the number of webs of the box beams and reducing the main tensile stress of original concrete webs of the box beams.

The invention discloses a narrow-face copper plate for a chamfer crystallizer. A working face of the narrow-face copper plate for the chamfer crystallizer comprises a first part and a second part; the first part is a sunken curved surface; the first part is a part on the working face in a range of 200mm to 400mm apart from an upper port of the crystallizer. The first part comprises a first curved surface region, two second curved surface regions and two transition curved surface regions, wherein the first curved surface region is a second degree parabola region; the two second curved surface regions are curved surfaces of which the crown heights are 1mm to 3mm; the two transition curved surface regions are curved surfaces with radii of 5mm to 35mm; the two transition curved surface regions are respectively connected with two opposite sides of the first curved surface region and the two second curved surface regions. The second part is connected with the first curved surface region, the two second curved surface regions and the two transition curved surface regions; the second part is a linear conical surface. The narrow-face copper plate for the chamfer crystallizer is also provided with a cooling waterway for cooling the working face; the distance between the cooling waterway and the edge, which is far away from the transition curved surface regions, on each second curved surface region is 20mm to 40mm; the distance between the cooling waterway and each transition curved surface region is 10mm to 30mm.

The invention relates to a fully prefabricated concrete-filled steel tube shear wall and a building structure system. The shear wall includes horizontally distributed steel bars, vertically distributed steel bars, steel pipes, horizontal panels and prefabricated concrete. The horizontally distributed steel bars and vertically distributed steel bars form the wall. The steel skeleton of the body; the steel pipes are vertically arranged in rows along the length of the wall in the steel skeleton; the horizontal slabs are vertically distributed horizontal slabs, and the two ends of the horizontal slabs are respectively welded and fixed to the steel pipes on both sides; the steel skeleton , steel pipes and horizontal panels are assembled in the factory, and concrete is pre-cast in the steel skeleton and steel pipes. In addition to the advantages of high bearing capacity, high rigidity, good anti-seismic performance, and excellent anti-corrosion and fire-proof performance after the combination of steel and concrete, the shear wall of the present invention also has the advantages of being able to form wall columns of various shapes, flexible use positions, The structural components are light, the transportation is convenient, and the on-site construction is convenient.

The invention belongs to the field of ceramic preparation, and discloses a laser zone-selection rapid forming method of a complex-phase ceramic casting mold and a product thereof. The method comprisesthe following steps: fully mixing Al2O3 powder with different particle sizes with epoxy resin E12 to obtain Al2O3-E12 composite powder; carrying out selective laser sintering (SLS) rapid forming by using the powder to obtain an Al2O3-E12 casting green body, and carrying out silica sol infiltration treatment under vacuum after surface dust is removed; degreasing and presintering to obtain an Al2O3-SiO2 ceramic cast green body; and performing silica sol infiltration treatment on the Al2O3-SiO2 composite ceramic casting mold under vacuum again, and finally sintering at high temperature to obtainthe complex-phase ceramic casting mold. According to the invention, only simple mechanical mixing is needed to ensure that the powder of the raw materials has good flowability and SLS forming performance, and by introducing a secondary silica sol vacuum infiltration process, the compactness of the obtained ceramic mold is improved while the dimensional accuracy is ensured.

The invention relates to a cold ramming paste material used for an electrolytic aluminum cathode cell overall furnace building technology. The cold ramming paste material is composed of, by weight, 0-50% of electrically calcined anthracite or metallurgical coke, 0-25% of artificial graphite powder, 16-23% of modified bituminous cement, 11.4-68.5% of andalusite and 3.6-21.5% of aluminum oxide. Thetechnology has the advantages that the problems that cold ramming paste is insufficient in expansion rate during sintering, low in electrical resistivity after sintering and low in erosion resistancein the overall furnace building technique are solved; the andalusite and the aluminum oxide are added into the cold ramming paste material, a side wall furnace lining is built overall according to different proportions, gradient change with the roasting body resistance being gradually increased from bottom to top from the electrolytic cell bottom to the molten salt surface after roasting is formed, the side wall and transverse current is reduced, the electrolytic current efficiency is improved, and energy consumption is effectively lowered; the size is increased in the roasting process, contraction of other materials is compensated, cracks are reduced, and the compactness is improved; and a network structure with graphite and mullite being staggered is generated in a roast body, the electrolyte erosion resistance of the furnace lining is improved, and the risks of furnace leakage and furnace penetration are reduced.

The present invention is former hot blast and latter vacuum microwave combining drying process of producing fruit and vegetable grains, and belongs to the field of fruit and vegetable food processing technology. The drying process includes the steps of: washing fruit and vegetable material, dicing, scalding to killing enzyme, cooling in flow water, draining, optional fast freezing and defrosting, soaking with seasoning, draining, pre-dewatering with hot blast to obtain semi-finished product with water content of 40-60 %, and final vacuum microwave drying to obtain product with water content of 2-5 %. The said process has the nutritious components and color well maintained, crisp product, short production period, low cost, high product quality and other features.

The present invention belongs to the technical field of wind tunnel experimental equipment. In view of the technical problem that the existing connection method forms a bending moment to the connecting pipe in the prior art, causing the deformation of the pipe or the failure of the flange seal, resulting in the leakage of high-temperature and high-pressure gas, the purpose of the present invention is to provide a A valve connection device for wind tunnel experiments, provided with a lifting device, the lifting device includes a flange clamp, an elastic support mechanism and a sliding base, the lower end of the sliding base is fixed on the ground, and the upper end of the sliding base is connected to the elastic supporting mechanism , the top of the elastic support mechanism is set as a flange clamp, and the flange clamp is set on the connecting pipe of the high temperature valve to lock the flange of the high temperature valve. The device can greatly reduce the longitudinal extension of the heat storage heater or the bending moment of the valve body on the connecting pipe during preheating, avoiding the possibility of flange leakage at the clamp and greatly improving safety.