33results about How to "Eliminate buoyancy" patented technology

The gas compression method/system restricts flow of emulsified liquid-gas mixture through many substantially radial capillary tube-passages in a rotating disk by either one-way valves, narrowing the passages, hydraulic impedance and/or reinforcement of coriolis forces in terminal end tail segments of the capillary passages. Compressed gas is released from peripherally collected compressed gas-liquid emulsion (beyond the terminal ends of the tubes) in a arcuate peripheral disc space when the compressed gas bubbles emerge from the peripherally collected emulsion. A compressed gas drain draws off gas from the peripheral space. Liquid drain draws off liquid from the space. In different embodiments, radial outboard flow through the capillaries is effected by various one-way valves which may be a single valve in the passage or multiple valves. Coriolis force in tail segments is enhanced by angular displacement in the direction of rotation. Valves may be used in combination with such tail-end segments.

The invention relates to a ventilation metal filling tank and a method for manufacturing the same, and belongs to the field of structures of common buildings. The ventilation metal filling tank (1) comprises upper assemblies (2), lower assemblies (3) and supports (4). The upper assemblies and the lower assemblies are made of metal sheets (5), each metal sheet is divided into a face plate (7) and two side plates (8) by two bend lines (6) on the metal sheet, dense meshes (9) are formed in regions of the face plates, slurry stopping sheets (10) are formed by metal sheets punched from the meshes, two ends of each metal sheet are respectively bent by 90-degree angles along the corresponding bend lines towards the same direction to form the corresponding upper assembly and the corresponding lower assembly, each of the upper assemblies and the lower assemblies is of a U-shaped structure with three surfaces, at least three supports are embedded in each upper assembly and the corresponding lower assembly, and the upper assemblies and the lower assemblies are oppositely fastened with one another to form the ventilation metal filling tank. The ventilation metal filling tank and the method have the advantages that the ventilation metal filling tank is quite convenient to produce, transport and mount and good in mechanical property, and a hollow floor system with the ventilation metal filling tank is good in reliability, earthquake resistance and cracking resistance.

The invention discloses a method and a structure for preventing a pit-type building foundation floating. The method comprises the following steps that: a water collecting pit is arranged under the bottom plane of the pit; the bottom part of the water collecting pit is provided with a water overflow outlet; the water overflow outlet is provided with a valve; when the water table is higher than the flotage generated by the water overflow outlet to the pit, the valve of the water overflow outlet is opened, groundwater overflows into the water collecting pit, and then a water pump pumps out water in the water collecting pit so as to reduce the water table, eliminate or reduce the flotage generated by the groundwater to the pit, and prevent damaging the building because of the pit floating. The method and the structure adopt a novel anti-floating principle to eliminate the flotage generated by the water to the pit by water dredge and drainage, and are suitable for the ground conditions of various ground layers under the building. The method and the structure can prevent the floatation of the ground water to the pit damaging the pit or the building during heavy rains or accident great water accumulation.

The invention relates to a steel net cage filling body and a manufacturing method thereof, and belongs to the field of common building structures. The filling body (1) comprises an upper component (2), a lower component (3), internal supporting pieces (4) and edge reinforcing pieces (5). The upper component and the lower component are each made of strip-shaped high-ribbed formworks (6) with the steel plate thickness smaller than 0.5 mm, each high-ribbed formwork is provided with two bending lines (7) which divide the high-ribbed formwork into a face plate (8) and two side plates (9), and the two ends of each high-ribbed formwork are bent by 90 degrees correspondingly along the bending lines towards the same direction, so that the U-shaped upper component (2) with three faces and two edges and the lower component (3) with three faces and two edges are formed correspondingly; at least one internal supporting piece (4) is mounted in the upper component and the lower component, and the filling body (1) is formed by oppositely buckling the upper component and the lower component. The steel net cage filling body has high economical performance and applicability and promotes the development of building technologies.

The invention discloses a high precision electronic balance which comprises a push-pull cover, a weighing tray, a base plate, a movable plate and a calibration device. The base plate is provided with four first through holes, a motor is fixed at the right end of the base plate, the movable plate is provided with four second through holes, a gear is fixed at the right end of the movable plate, and the motor drives the movable plate to move through the gear. The high precision electronic balance enables air temperature around the weighing tray to be close to air temperature around the calibration device through air convection, eliminates difference of buoyancy of objects in the weighing tray and calibration device buoyancy, and is small in measuring result error and accurate in measuring result.

The invention relates to a hollow floor filled by breathable boxes and a manufacturing method of the hollow floor and belongs to the field of general building structures. The hollow floor (1) comprises beam top iron pieces (2), beam bottom iron pieces (3), ribbed beam stirrups (4), plate top iron pieces (5), concrete (6) and breathable box combined bodies (7), wherein the beam top iron pieces, beam bottom iron pieces and ribbed beam stirrups form ribbed beams (8); the hollow floor plane is divided into multiple partitions (9) by two ribbed beams of which the directions are mutually orthogonal; the breathable boxes (10), steel wire meshes (11) and positioning separators (12) form the breathable box combined bodies (7); the breathable box combined body is mounted in each partition; the plate top iron pieces are assembled on the upper part of the breathable box combined body; the hollow floor is formed after concreting; and the thickness of the concrete on the lower part of the breathable box is more than or equal to 30mm. According to the hollow floor disclosed by the invention, raw material production and field floor construction are extremely convenient, and the hollow floor is large in span, light in weight and high in structural reliability, shock resistance and crack resistance.

The invention discloses a bottom expanding-multisection side expanding anti-pull prestressed anchoring gravel pile and a construction method and belongs to the technical field of foundation base structures. The gravel pile comprises a side expanding gravel pile body provided with multiple side expanding sections and at least one prestressed anchor cable/rod; an anchor disc is arranged at the top of the side expanding gravel pile body, and a bottom expanding base provided with an expanded bottom is arranged at the bottom of the side expanding gravel pile body. The construction method comprises the steps that a gravel pile hole is dug, and bottom expanding and side expanding are conducted; a hardcore bed is constructed; a reinforced concrete bottom expanding base is constructed, and the anchor cable/rod is fixed in the reinforced concrete bottom expanding base; the side expanding gravel pile body is constructed; the anchor disc at the top of the pile and an anchor plate are constructed, and anchor cable/rod prestressing force is exerted. According to the bottom expanding-multisection side expanding anti-pull prestressed anchoring gravel pile and the construction method, gravel is tightly pressed in a gravel hole through the anchor cable/rod so as to form the gravel pile body, so that the bottom expanding base, the gravel pile body and the anchor disc are made into a force-bearing whole, and thus the anti-pull capacity is effectively improved; in addition, the anti-shearing and anti-slip resistance between a pile body and a soil body is increased through the side expanding gravel pile body and the bottom expanding base, the stratum applicability of a structure is improved, and the influence of underground water is reduced.

The invention provides a hollow floor slab supported by a steel mesh body with holes, the cavity floor is composed of a main beam, a rib beam, concrete and a steel mesh body; the steel bars in the middle of the main beam are less than the steel bars at both ends of the main beam; The slump of the concrete is less than 200mm; the steel mesh body is composed of steel mesh and foamed cement blocks; the steel mesh is expanded steel mesh or punched steel mesh; Blocking the foamed cement block; the upper or lower end of the supporting foamed cement block has a prefabricated notch; the height of the foamed cement block matches the height of the inner space of the steel mesh; at least one supporting foaming block in the steel mesh body Cement blocks and two plugging foam cement blocks.

The invention discloses an anti-blocking and anti-floating grouting material for shield tunnel synchronous grouting, which comprises the following components: water, cement, water glass and a retarder, and is characterized in that the cement is 42.5-grade Portland cement; wherein the water glass is a sodium silicate aqueous solution with a baume degree of 30-40 degrees and a modulus of 3.1-3.3, and the retarder is an ammonium dihydrogen phosphate crystal with a purity of 99.0% or more, a pH value of 4.0-4.5 and a clarity of 3 or less. The grouting material not only has good anti-floating performance, but also can be used for quickly gelatinizing and eliminating buoyancy borne by the duct piece, so that the anti-floating requirement of the shield tunnel is met; the anti-blocking performanceis good, the situation that the grouting pipe is blocked due to the fact that slurry is gelled in the grouting pipe is avoided, and the construction efficiency is high; and meanwhile, the strength ofstones formed by grouting is high, so that the shield tunnel structure is more stable and reliable.

The invention relates to the field of seed cultivation, in particular to rising and falling type water pumping soaking seed cultivation screening equipment for a farm. The technical problems that seeds are scattered by buoyancy at the moment of entering water, and meanwhile, the seeds floating on the water surface expand and sink after being soaked in water and cover qualified seeds, so that the soaking rate of the seeds is reduced, germination is incomplete, and cultivation cannot be conducted are solved. According to the technical scheme, the rising and falling type water pumping and soaking seed cultivating and screening equipment for the farm comprises a supporting frame, a scraping mechanism and the like; and the support frame is connected with a scraping mechanism. According to the seed screening device, seeds are screened, buoyancy borne by the seeds when the seeds enter the water surface is eliminated in a water pumping and conveying mode, it is guaranteed that the seeds cannot be knocked off, are still evenly distributed and can be fully soaked, meanwhile, some impurities and unqualified seeds are screened out, and the working efficiency is improved.

The invention relates to a ventilating plastic box and a manufacturing method thereof, and belongs to the field of common building structures. The plane shape of the plastic box (1) is rectangular, and the ratio of the long edge length to the short edge length is smaller than or equal to two. The plastic box comprises an upper assembly (2) and a lower assembly (3), the upper assembly (2) is composed of a frame plate (4), stiffening ribs (5) and a top cover plate (6), and one or more exhaust holes (7) are formed in the top cover plate; the lower assembly (3) is composed of a frame plate (4), stiffening ribs (5) and a bottom support plate (8), and the bottom support plate (8) is bestrewn with dense vent holes (9). The stiffening ribs are uniformly arranged in the upper assembly and the lower assembly along the inner walls of the frame plates, the inner wall of the top cover plate and the inner wall of the bottom support plate, the upper assembly and the lower assembly are spliced in a vertically aligned mode, and the frame plates are matched. The plastic box is convenient to produce, install and transport and good in mechanical property, and a hollow floor formed by the plastic box is good in reliability, seismic performance and crack resistance.

The invention provides a novel diversion drainage structure of a post-cast strip and a construction method of the novel diversion drainage structure of the post-cast strip and belongs to the field of diversion drainage, aiming to overcome huge potential safety hazards due to the fact that an existing conventional post-cast strip structure develops into a structural crack after eroded by underground water, and the crack can expand gradually as time passes to lead to water seepage and even steel bar fracture, basement arching and elevation or displacement of an independent foundation of a bearing platform finally. The construction method includes that the middle plane of every water-stop steel plate is machined to form an 'omega' shape, the space of every 'omega' shape is filled with medium sand wrapped by geotechnical cloth, the outer surface of the geotechnical cloth is coated with cement paste, fast-ribbed formworks and the water-stop steel plates are fixedly bottomed through spot welding every other 500 mm, and the fast-ribbed formworks on the inner sides of every two adjacent water-stop steel plates are in butt joint sequentially.