1457 results about "Hollow core" patented technology

The invention discloses a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

The invention discloses a lightweight concrete safety energy storage cabinet and a preparation method thereof, and the lightweight concrete safety energy storage cabinet is obtained by injecting lightweight concrete into a mold and performing steam curing; the lightweight concrete is prepared from the following raw materials in parts by weight: 20 to 40 parts of cement, 8 to 20 parts of silica fume, 8 to 25 parts of slag powder, 0 to 10 parts of fine sand, 15 to 35 parts of lightweight fine ceramsite sand, 0 to 21 parts of coarse ceramsite sand with the particle size of 5 to 10 mm, 0 to 3 parts of steel fiber, 0 to 1.5 parts of PP fiber, 0.5 to 2.0 parts of polycarboxylic acid type water reducing agent, 0 to 14 parts of hollow glass beads, 0.1 to 0.5 part of release agent and water. Wherein the water-binder ratio is 0.15 to 0.22; the use amounts of the steel fibers and the PP fibers are not 0 at the same time; the light ceramsite sand and the coarse ceramsite sand are subjected to pre-wetting treatment before being used; the fireproof, explosion-proof and heat-insulating material has the characteristics of light weight, safety and impermeability, and has excellent fireproof, explosion-proof and heat-insulating properties.

The invention discloses a self-repairing waste felt-based carbon fiber electromagnetic shielding concrete structure and a design method, and relates to the field of protective engineering building materials and multifunctional concrete structural design, the self-repairing waste felt-based carbon fiber electromagnetic shielding concrete structure comprises a base material, waste felt-based carbon fibers, hollow glass microsphere cell bodies and a synergistic enhancement mechanism, the base material comprises cement, silica fume, quartz sand and a high-efficiency water reducing agent, the waste felt-based carbon fibers are crushed to the particle size of 50-100 meshes, the crushed waste felt-based carbon fibers are modified by a specific silane coupling agent and then are uniformly dispersed in the ultra-high performance concrete base, graphene or carbon nanotube conductive particles are combined and doped, and the ultra-high performance concrete is prepared. A continuous three-dimensional conductive network is formed, the electromagnetic shielding effectiveness in the wide frequency band of 1-40 GHz reaches 30 dB or above, compared with a traditional metal shielding layer, the weight is reduced by 60%, the cost is reduced by 50%, and meanwhile the problem of metal corrosion is avoided.

The invention discloses large open type karst cave local rock forming equipment and method, and belongs to the technical field of karst area pile foundation construction. The problems that in traditional cloth bag pile construction, the hole collapse risk is high, the bearing capacity is insufficient, and grouting displacement of a steel reinforcement framework occurs are mainly solved. According to the equipment, grout overflow holes distributed in a staggered mode are preset in a variable-diameter hollow steel cylinder body, and a grout overflow groove is formed in the variable-diameter part of the cylinder bottom; the diameter of the upper part of the coarse structure is larger than that of the lower part of the coarse structure; the steel sleeve is anchored at the top of the steel cylinder and has larger diameter; the cylindrical plastic sleeve is adhered to the inner wall of the steel cylinder; the grouting pipe is arranged in the cylindrical plastic sleeve in a penetrating manner; and the annular hoop surrounds the outer side of the fiber bag through the plastic short pipe to form a bamboo-shaped constraint structure. The upper end of the fiber bag is anchored to the steel sleeve, and the lower end of the fiber bag is anchored to an anchor hole in the bottom of the steel cylinder. The equipment is used for large open type karst cave pile foundation construction, the hole collapse resistance is improved through a composite structure of the steel cylinder and the fiber bag, the bearing capacity is increased, and grouting displacement is prevented.

The present invention relates to the technical field of water conservancy engineering, and specifically to a cofferdam for ship lock reconstruction and a construction method. A cofferdam for ship lock reconstruction comprises a concrete cofferdam body and a hollow concrete support structure. The concrete cofferdam body is closely attached to the walls on both sides of the ship lock and extends along the direction of water flow. The hollow concrete support structure is arranged between two adjacent concrete cofferdam bodies. The hollow concrete support structure is fixedly connected to the concrete cofferdam body by a connecting device. The hollow concrete support structure comprises a bottom layer, a hollow layer, and a top layer. Multiple rows of cavities arranged in parallel are formed inside the hollow layer. Blasting devices are equidistantly embedded in the concrete wall between two adjacent cavities. This application forms a stable water retaining barrier by placing the concrete cofferdam body close to the ship lock wall. The hollow layer design can reduce its own weight. In addition, the blasting device embedded in the support structure can achieve efficient and controllable demolition compared to traditional mechanical or manual demolition, which can greatly shorten the construction period.

The utility model provides a hot-melt welding device for forming a box by using a hollow plate, which comprises a rack provided with a working surface and a cross beam, a box plate positioning strip is arranged on the working surface, and the cross beam is erected above the working surface; the hot melting guide-in plate is provided with a guide-in opening which is opened towards the left side, is used for supporting one side of the boxboard, and is arranged below the cross beam through a first connecting frame; the hot air gun is connected with the beam through a moving mechanism, and the heating end of the hot air gun enters or exits from the hot melting position through up-and-down and left-and-right movement; the front pressing wheel set and the rear pressing wheel set are used for conveying the boxboards and pressing the hot-melted boxboards correspondingly. The device is simple in overall structure, low in maintenance cost and high in hot melting welding efficiency; and the conveying and welding stability of the boxboards is improved.

The invention relates to a method for rinsing a machining front (4) in a hollow structure (2) formed by material removal in a workpiece (1), preferably in a substrate for an optical element. The method comprises: arranging a free end (8) of a preferably flexible fluid line (7) in the region of the machining front (4). In the method, to rinse the machining front (4), the fluid (6) is supplied to the machining front (4) through a space (9) between an outer surface (10) of the fluid line (7) and a circumferential surface (5) of the hollow structure (2) and discharged from the machining front (4) within the fluid line (7). The invention also relates to a device (12) configured for carrying out the method.

The invention discloses a pile machine drilling positioning device for building foundation construction, and relates to the field of building foundation construction, the pile machine drilling positioning device comprises a pile foundation hole pedestal, the pile foundation hole pedestal is arranged in a through mode, and a through pile foundation drill rod positioning cylinder is arranged in a through cavity of the pile foundation hole pedestal in a penetrating mode; the hollow cavity of the pile foundation drill rod positioning cylinder is used for a pile machine drill rod to movably pass through; a plurality of positioning clamping plates are arranged in the pile foundation drill rod positioning barrel, and the ends, close to the inner wall of the pile foundation drill rod positioning barrel, of the positioning clamping plates are used for being connected to a lifting pedestal through movable mechanisms. The lifting pedestal is used for being connected to the top end of the pile foundation hole pedestal. The hollow cavity of the pile foundation hole pedestal is provided with a connecting mechanism used for driving the positioning clamping plates to move synchronously through the moving mechanism. The positioning device is convenient to assemble, disassemble and move, and time and labor cost can be saved; in addition, centering, positioning and adjusting of the drill rod can be rapidly achieved, and the position accuracy and the drilling quality in the drilling process are guaranteed.

The invention discloses a stirring device for building construction, and belongs to the technical field of building construction. Comprising a stirring barrel, a stirring cavity is integrally formed in the upper surface of the stirring barrel, a sealing cover plate is fixedly connected to the upper surface of the stirring barrel through a plurality of bolts, a control box is fixedly connected to the upper surface of the sealing cover plate, and a feeding opening is fixedly connected to the position, located on the right side of the control box, of the upper surface of the sealing cover plate; a motor is controlled to drive a rotating rod to rotate, reverse rotation of a hollow rod and the rotating rod is achieved by means of meshing transmission of a first bevel gear, a third bevel gear and a second bevel gear, then a first stirring blade and a second stirring blade are driven to conduct reverse stirring, and strong convection and shearing effects can be formed in a reverse stirring mode; the problem of insufficient mixing caused by single stirring direction of the existing stirring device is effectively solved, and the stirring quality is greatly improved.

The invention belongs to the technical field of cranes, and discloses a stable feeding device for building construction, the stable feeding device comprises a crane body, the bottom end of the crane body is provided with a vehicle bottom groove, the two sides of the top end of the vehicle bottom groove are both provided with first supporting parts, and the first supporting parts are each provided with a second supporting part; deep anchor points are formed through the conical head and the ground pressure plate, first-level anchoring is formed, deflection-free downward moving positioning can be carried out for different stratums, high-strength supporting operation is achieved, the multiple sets of supporting shaft columns are adaptive to concave-convex ground through the abutting plate, multiple supporting points are expanded, second-level assistance is achieved, the number of the supporting points is increased, and the supporting area is expanded. A more stable mechanical structure is formed, lateral torque and sudden load impact can be effectively resisted, the probability of occurrence of overturning accidents is reduced, the stable state of the crane body during hoisting and feeding of building materials is guaranteed, the supporting shaft column is in linkage with the hollow ring through the supporting shaft rod, the field angle is automatically adjusted along with the anchoring depth, and load distribution is optimized.

The invention relates to the technical field of sound insulation materials, in particular to a high-performance sound insulation material for buildings and a preparation method thereof, and the high-performance sound insulation material comprises the following raw materials in parts by weight: 60-80 parts of polypropylene, 15-25 parts of filler, 10-20 parts of talcum powder, 5-15 parts of flexibilizer, 0.2-1 part of antioxidant and 0.2-0.4 part of light stabilizer. According to the invention, the SEBS with high damping performance is utilized to provide a main viscoelastic effect, and the density performance of the material can be directly increased by combining the barium sulfate material with high density, so that the low and medium frequency sound insulation function is improved, and the hollow glass beads can utilize the spherical surfaces to cause scattering and refraction of sound waves and disturb the propagation direction of the sound waves in the hollow glass beads; meanwhile, in cooperation with the high radius-thickness ratio state of the mica sheet, sound waves are further dispersed and refracted in combination with the hollow glass beads, the conduction path of the sound waves is prolonged, and therefore the medium-high frequency sound insulation performance is improved, and the sound insulation performance of the material is effectively improved.

The invention discloses a damper anti-seismic system and method based on torsional energy dissipation of hollow round pipes. The damper anti-seismic system comprises a frame beam, a frame column, a cantilever wall and a torsional energy dissipation damper. The frame beams and the frame columns are connected with a building, the cantilever walls are connected with the frame beams, and the torsional energy dissipation dampers are arranged between the paired cantilever walls and connected with the cantilever walls to dissipate energy transmitted by the cantilever walls. According to the damper anti-seismic system, the torsional energy dissipation damper is arranged, a metal structure system is adopted, the liquid leakage risk of a traditional viscous damper is avoided, building vibration energy is evenly consumed through ingenious cooperation of a metal structure, and the anti-seismic performance of a building structure is improved. Due to the arrangement of the multi-section type hollow energy dissipation pipe fittings and the paired energy dissipation pipe fittings, the energy dissipation effect of the torsional energy dissipation damper is improved, the stability of the torsional energy dissipation damper is improved, fatigue fracture at the connecting position is avoided, and the service life of the torsional energy dissipation damper is prolonged.

The invention relates to the technical field of building materials, and provides a sound-insulation fireproof building material and a preparation method thereof. The sound-insulation and fireproof building material is prepared from, by weight, 100 parts of flame-retardant wood fiber, 15-30 parts of adhesive, 5-6 parts of hollow glass beads and 1-3 parts of waterproof agent, a preparation method of the flame-retardant wood fiber comprises the following steps that a flame retardant is dispersed in a solvent, wood fiber is added, mixing and drying are conducted, and the flame-retardant wood fiber is obtained; and the flame retardant comprises a 2, 4-dihydroxy-5-pyrimidine boric acid and / or a phenyl phosphate compound. By means of the technical scheme, the problem that in the prior art, sound-proof and fireproof building materials are poor in flame retardant property is solved.

The invention discloses a continuous type hollow glass brick surface paint spraying system and technology, relates to the technical field of spray coating, and aims to solve the technical problems that an existing mechanical arm is multiple in paint spraying limitation, low in efficiency and prone to mixing during cleaning. The continuous type hollow glass brick surface paint spraying system comprises a water containing plate, a paint spraying mechanism, a universal assembly and a flushing assembly. The straight line gathering or unfolding of the hard pipeline is matched with the up-and-down movement of the limiting plate, when the gun head gathers, paint is vertically sprayed to the flat glass brick, and it is guaranteed that a plane paint layer is even and free of omission; when the gun heads are unfolded, independent multi-direction paint spraying of the multiple gun heads is achieved by means of matching of the outer ball head pipes and the inner ball head pipes, glass bricks with groove patterns are matched, and leakage spraying, thin coating and accumulation of grooves are avoided; the flushing assembly is sealed and matched with a blocking piece through a hollow ball head communicating structure and a blocking piece, and during paint spraying, the blocking piece seals a water inlet to keep paint pure; during cleaning, the blocking piece resets to seal the blocking piece, the water inlet is communicated, cleaning liquid accurately enters the gun head for cleaning and does not need to flow through an external pipeline, and the paint spraying requirements of different glass bricks are met.

An antiresonant hollow core fiber (700) is described. The fiber comprises an outer cladding (704) and an inner cladding comprising a plurality of primary cladding capillaries (710), each primary cladding capillary bonded to an inner wall (706) of the outer cladding (704) at a peripheral location around the circumference of the inner wall. The ring of primary capillaries defines a hollow core (106) formed by a central void within the ring of primary cladding capillaries (710). One of the outer cladding and the inner cladding comprises a rod or tube of a different refractive index and / or thickness from the rest of said one of the outer cladding and inner cladding.

To provide a columnar structure demolition method, which is a demolition method for a columnar structure on the inner side of a double structures in which two hollow columnar structures are doubly formed, and does not require work of cutting and crushing at a high place like a top end part of the columnar structure and prevents rubble generated by cutting and crushing from dropping.SOLUTION: A columnar structure on the inner side is demolished by repeating a step to cut a bottom end of the columnar structure on the inner side and a step to lower the columnar structure on the inner side while supporting load of the columnar structure on the inner side by a lifting machine installed on a top end of the columnar structure erected on the outer side of the columnar structure on the inner side.SELECTED DRAWING: Figure 6

The utility model discloses a chassis profile and an assembly type kitchen and bath chassis comprising the same, the chassis profile comprises a frame, the bottom edge of the frame is used for being laid on the bottom surface of a building, and the top edge of the frame is used for being matched with an assembly type wallboard; the interior of the frame is hollow to form a cavity, and a water outlet communicated with the cavity of the frame is formed in the inner side edge of the frame; the base plate section bar is further provided with a first flow guide opening communicated with the cavity of the frame, the first flow guide opening can guide indoor accumulated water into the cavity of the frame and discharge the indoor accumulated water through the water outlet, water can be prevented from being accumulated in the base plate section bar, peculiar smell and water leakage are prevented, the service life of the base plate section bar can be prevented from being affected, and the service life of the base plate section bar is prolonged. Therefore, the use experience and the service life of the kitchen and bath chassis are improved.

The invention relates to the technical field of modular houses, and discloses a modular house transportation bracket which comprises a fixed frame, movable frames are arranged on the left side and the right side of the fixed frame correspondingly, an adjusting mechanism comprises two hollow plates, the two hollow plates are fixedly connected to the left side and the right side of the fixed frame correspondingly, and first bidirectional threaded rods are rotationally connected to the inner sides of the hollow plates; the rear ends of the two first bidirectional threaded rods penetrate through the hollow plate, sliding blocks are in threaded connection with the front sides and the rear sides of the outer walls of the first bidirectional threaded rods, supporting plates are rotationally connected with one sides of the sliding blocks, connecting plates are fixedly connected with the adjacent sides of the two movable frames, and connecting bases are fixedly connected with the front ends and the rear ends of one sides of the connecting plates. Through rotation of the first bidirectional threaded rod, the multiple sliding blocks move at the same time, the sliding blocks push the connecting base to move through the supporting plate, the connecting plate can push the movable frame to move accordingly, the supporting area is rapidly adjusted, and the modular house transportation device adapts to transportation work of modular houses of different sizes.

To provide a hollow form for a precast segment girder and a manufacturing method of the precast segment girder, which can efficiently manufacture a cross section reverse U-shaped precast segment girder capable of easily recognizing aging degradation by visual inspection, a static image, a moving image or the like.SOLUTION: A hollow form 100 for a precast segment girder is for forming a hollow part (21) of a cross section reverse U-shaped precast segment girder (2) where an opening groove (22) is formed by opening a lower part of the hollow part (21) like a groove. The hollow form 100 is partitioned into multiple narrower width pieces than the width of the opening groove (22), and is constituted to be able to remove a form by extracting each piece among the multiple pieces of the hollow form 100 from the opening groove (22) after concrete placing.SELECTED DRAWING: Figure 6

The invention discloses an embedded part accurate installation device and a construction method, and relates to the technical field of constructions.The embedded part accurate installation device comprises an embedded assembly and a supporting frame, the embedded assembly comprises an embedded plate, anchor bars and a hollow plate, the anchor bars are fixedly installed at the bottom of the embedded plate, and the hollow plate is fixedly installed at the bottom of the embedded plate; an electric telescopic rod is fixedly installed on the surface of the supporting frame, a platform is fixedly installed at the output end of the electric telescopic rod, and the electric telescopic rod is used for adjusting the height of the platform; wherein an adjusting device used for accurately adjusting the position of the embedded assembly is arranged on the platform, the adjusting device comprises an electric push rod and a rotating wheel, the embedded assembly can be more attached to the pouring form of concrete by monitoring the pressure in real time and finely adjusting the position, and then the stability of the overall structure is improved; and the recovery process of the positioning device is simpler and more convenient.

The invention discloses a cavity assembly type reinforced concrete web bridge structure and a construction method thereof, and relates to the technical field of bridge engineering.The cavity assembly type reinforced concrete web bridge structure comprises a plurality of cavity type webs arranged in the length direction of a bridge, the upper side and the lower side of the web center component are each provided with a steel bar staggered net composed of a plurality of oblique steel bars and a plurality of transverse steel bar rings, and the steel bar staggered nets are in a hollow frustum shape. The top flange steel plate is horizontally arranged at the top of the cavity type web, and a concrete bridge deck is arranged at the top of the top flange steel plate; the lower flange steel plate is horizontally arranged at the bottom of the cavity type web; according to the hollow cavity type web, the inclined steel bars, the transverse steel bar rings and the web center component are combined to form a hollow frustum structure, the dead weight of a web bridge structure is greatly reduced, stress concentration is avoided, the cracking risk of the structure is reduced, and the overall strength and stability of the structure are effectively enhanced; meanwhile, local shear resistance and bending resistance are enhanced, the service life of the bridge is prolonged, and the probability of local damage is reduced.

The invention discloses an anti-permeability detection device for ultra-high performance concrete, and belongs to the technical field of anti-permeability detection. Comprising a mounting box body, the interior of the mounting box body is hollow, one end of the mounting box body is provided with a plurality of anti-permeability detection assemblies, one anti-permeability detection assembly comprises a mounting plate, a through hole is formed in the middle of the mounting plate, an annular groove is formed in the outer side of the through hole, and an annular sealing ring is arranged in the annular groove; the device comprises a mounting plate, vertical driving elements are symmetrically arranged on the mounting plate, the vertical driving elements are fixed to the mounting plate, the output ends of the vertical driving elements face the lower portion of the mounting plate, a lifting plate is arranged below the mounting plate and fixedly connected to the output ends of the vertical driving elements, a hollow pipe is arranged in the middle of the lifting plate, and the hollow pipe is fixedly connected to the output ends of the vertical driving elements. And one end of the hollow pipe is fixed on the lifting plate. According to the technical scheme, the problem that the end of the test piece collides with the bottom area of the test mold, and consequently the impermeability detection result is affected is solved.

The invention belongs to the field of building components, and particularly relates to a prefabricated lattice wall. According to the technical scheme, the structure is formed by splicing a plurality of aerated concrete reinforced plates, a plurality of transverse penetrating type circular-section grouting holes are formed in the aerated concrete reinforced plates, transverse penetrating type semicircular-section grouting holes are formed in the short edges of the aerated concrete reinforced plates, and vertical penetrating type semicircular-section grouting holes are formed in the long edges of the aerated concrete reinforced plates; the two vertical penetrating type semicircular section grouting holes in the splicing position of every two adjacent aerated concrete reinforced plates are spliced to form a vertical circular section grouting hole, and criss-cross hollow grids are formed. Transverse steel bars and vertical steel bars are respectively inserted into the hollow grids to form a criss-cross steel bar net, grouting materials are poured into the hollow grids, and the steel bar net and the grouting materials form a lattice-shaped connecting structure together. According to the prefabricated lattice type wall body, the heat preservation performance, the shock resistance and the construction precision of the wall body can be effectively improved.

The utility model discloses a protection box in the use process of a herbivorous animal salt brick in the related technical field of salt brick protection boxes, which comprises a salt brick protection cover and a supporting chassis, a chassis matching mounting column is fixedly arranged in the middle of the upper part of the supporting chassis, and the chassis matching mounting column is in threaded connection with the lower end of a penetrating rod; the penetrating rod is of a hollow structure, an internal thread is arranged in a cavity in the lower end of the penetrating rod, and an external thread is arranged at the upper end of the penetrating rod. The supporting base plate and the penetrating rod are arranged below the animal salt brick placing device and used for supporting and fixing animal salt bricks, the upper connecting rod is connected to the upper portion of the penetrating rod through the connecting cap, the salt brick protective cover is installed on the outer side of the upper connecting rod in a sleeved mode, and the salt brick protective cover can effectively protect a salt brick body. By adjusting the salt brick protective cover, the time for animals to lick the salt bricks can be limited, and the condition of excessive intake of the salt bricks is avoided.

The application relates to a house building integrally poured with a hollow outer wall and a main body structure and relates to the field of house building. The house building integrally poured with the hollow outer wall and the main body structure comprises a main body forming module, a wall forming template and a heat preservation piece, the main body forming module comprises corner plates and a template, four corner plates are symmetrically arranged, the four corner plates are vertically arranged at corner positions of main body support columns respectively, sliding grooves are arranged on vertical end faces of the two sides of the corner plates, the wall forming template is arranged between the two main body forming modules, the wall forming template is assembled on the front and back sides of the two main body forming modules, and the heat preservation piece is vertically arranged in the wall forming template, the heat preservation piece comprises heat preservation blocks, the heat preservation blocks are made of polyethylene foam material, and connecting sliding strips are vertically fixed on vertical end faces of the two sides of the heat preservation blocks. The heat preservation piece and the wall are integrally poured and formed, the integrally pouring and forming of the heat preservation piece and the wall is guaranteed, no gap exists between the heat preservation piece and the wall, and the overall heat preservation property of the heat preservation part on the outer wall is improved.

To provide a method for removing an existing hollow floor slab supported from below by a substructure, which can safely remove the existing hollow floor slab without restricting the space below the existing hollow floor slab and can improve workability. [Solution] The method for removing an existing hollow deck according to the embodiment is a method for removing an existing hollow deck 1 supported by a pier 8, and includes an installation process for attaching anchor brackets 21, 21 to the underside of each of the existing hollow deck 1's piers 8, 8 between a pair of piers 8, 8, attaching an external cable 3 to the anchor brackets 21, 21, and tensioning the external cable 3; a cutting process for cutting the existing hollow deck 1 in the bridge axis direction X after tensioning the external cable 3 to form a first block 71 having the external cable 3; and a removal process for removing the first block 71 using lifting devices 83, 84.

The utility model relates to the field of casting hole sanding devices, in particular to a casting hole sanding device which comprises a shell. A movable door is installed on the side face of the shell, high-pressure impact assemblies are arranged on the side wall, opposite to the movable door, of the shell, the two side walls adjacent to the movable door and the top of the shell, a separation assembly is arranged on the side wall of the shell in a penetrating mode, and the output end of the pressure pump communicates with the multiple sets of high-pressure impact assemblies installed on the shell. Sand in a casting hole is impacted and removed through high-pressure water flow, a spiral blade can drive an inner hollow shaft to rotate in a hollow pipe port under driving of the water flow, and the spraying angle of a spraying head on a spherical shell can be adjusted when the spherical shell rotates, so that spraying impact is conducted on the surface of a casting from multiple angles, and the sanding effect is improved; the water flow permeates downwards to be stored in the precipitation bin for precipitation, the water-permeable belt conveys the molding sand intercepted on the water-permeable belt out of the shell, and the molding sand is collected into the collection bin and then remains on the filter plate, so that the molding sand is reused after being dried.

The present application relates to a main tower of a suspension bridge, comprising: a steel tower column having a hollow cross-section; a concrete tower column located on the inner side of the steel tower column; a main cable saddle fixed to the top of the concrete tower column; and a plurality of force transmission members distributed along the longitudinal and transverse directions of the bridge, provided between the top side of the outer wall of the concrete tower column and the top side of the inner wall of the steel tower column. The present application achieves the decoupling of the axial force and bending moment of the steel-concrete composite tower column. The vertical load at the top of the tower is entirely borne by the concrete tower column, and the vast majority of the longitudinal unbalanced horizontal force is borne by the steel tower column. Since the steel tower column does not bear the huge vertical load at the top of the tower, the size of the steel structure can be reduced, and the longitudinal unbalanced horizontal force at the top of the tower can be reduced, thereby further optimizing the structural size, forming a virtuous cycle, optimizing the force-bearing performance of the main tower, and improving economic efficiency.

The application provides a large-space variable house type steel structure residence and a design method thereof, and relates to the technical field of steel structure residence design, and specifically comprises mutually connected column bodies and floors, the column body is sequentially provided with a concrete core, a rectangular steel pipe column and a first reinforced concrete cladding layer from inside to outside; the first reinforced concrete cladding layer comprises a steel mesh layer; the floor is sequentially provided with a top reinforced concrete layer, a middle layer and a bottom reinforced concrete layer from top to bottom; the middle layer is uniformly provided with a combined rib beam, a hollow square box and a floor rib beam; the combined rib beam is used for connecting the floor and the column body; a plurality of floor rib beams are vertically arranged to form a grid structure; the grid structure is symmetrically arranged on both sides of the combined rib beam; and the hollow square box is arranged in a grid hole of the grid structure. The scheme can provide a large-space beamless and columnless space, improve the use area in the suite, and be suitable for the dynamic change requirement of a family structure.

The invention discloses a rectangular hollow steel shell-UHPC (Ultra High Performance Concrete) combined bridge tower section optimization design method, which comprises the following steps: acquiring an envelope bending moment and a corresponding axial force according to axial force and bending moment combinations of a bridge tower under multiple working conditions: Mmax is the envelope bending moment of the bridge tower section; mi is the bending moment value of the section of the bridge tower under any working condition; f is the axial force corresponding to Mmax; the flexural capacity of the bridge tower section is calculated according to the expression that the ratio of M to Mmax is calculated, and if M / Mmax is larger than or equal to 1.0 and smaller than or equal to 1.5, it is confirmed that the bridge tower section meets the capacity requirement; otherwise, adjusting the size parameter of the section of the bridge tower, and repeating the calculation process until M / Mmax is more than or equal to 1.0 and less than or equal to 1.5. According to the method, the characteristic of interface damage is used as a design index of the section of the steel shell-UHPC combined bridge tower, the usage amount of the steel shell and the UHPC material in the section of the bridge tower can be effectively limited, and the engineering cost optimization of the bridge tower is achieved.