819 results about "Hollow core" patented technology

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 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 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 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 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 utility model belongs to refractory production technical field, especially relates to a hollow refractory precast piece anti -settling casting mould, including bottom plate, side wall one, side wall two, pressing plate, mould core, center positioning rod, vibrating motor, the middle part of bottom plate is equipped with mould core, the outer periphery of mould core is equipped with the side wall one and side wall two that are connected with each other, the inner surface of side wall one and side wall two is equipped with taper, the bottom of side wall one and side wall two is engaged with the positioning convex edge on bottom plate, the top of mould core crimps pressing plate, center positioning rod passes through from pressing plate and mould core center, and is detachably connected with bottom plate, the both ends of pressing plate are respectively crimped with the top of side wall one and side wall two, bottom plate, mould core and side wall one and side wall two surround and form pouring cavity, a plurality of vibrating motors are arranged symmetrically outside side wall one and side wall two or are all uniformly arranged. The utility model changes the moving track of big particle by the introduction of multidirectional vibration, and relieves the particle settlement phenomenon caused by traditional unidirectional vibration.

The utility model provides a hinge joint reinforcing device for a prefabricated hollow slab girder bridge, and relates to the technical field of hinge joint reinforcing. The prefabricated hollow slab girder bridge hinge joint reinforcing device comprises a supporting plate, an air outlet plate used for blowing air to a hinge joint is installed on the inner bottom wall of the supporting plate, a power mechanism used for providing wind power is arranged below the air outlet plate, and two connecting mechanisms arranged in a mirror image mode are arranged on the outer surface of the supporting plate; and rotatable positioning rollers are arranged at the ends, away from the air outlet plate, of the two connecting mechanisms. According to the hinge joint reinforcing device for the prefabricated hollow slab girder bridge, the positioning roller rotates and advances in the hinge joint, so that the air outlet plate is aligned with the hinge joint all the time in the moving process, dislocation is avoided during moving, the effect of avoiding dislocation is achieved, and the problem that when the air blowing position is moved and replaced, due to the fact that no limitation exists, alignment is conducted by workers is solved; and when position deviation occurs, adjustment needs to be carried out, and the operation is troublesome.

The application discloses a basement waterproof structure and relates to the technical field of building structures. The basement waterproof structure comprises a wall body and a bottom plate, a concrete cushion layer is arranged below the bottom plate, a block partition layer is further arranged, the block partition layer comprises an outer wall part and a bottom plate part, the outer wall part surrounds the wall body, the bottom plate part is arranged below the concrete cushion layer, the block partition layer is built by hollow blocks, the hollow blocks are provided with holes, two ends of the holes are provided with through holes, and the hollow blocks are provided with notches connected with the holes; wherein the hollow blocks corresponding to the outer wall part are defined as first blocks, the hollow blocks corresponding to the bottom plate part are defined as second blocks, the hole direction of the first blocks is arranged in the vertical direction, the notch of the first blocks faces the wall body, and the hole direction of the second blocks is arranged in the horizontal direction; the holes of the first blocks are used as the inner cavity of the outer wall part, the inner cavity of the outer wall part is closed, the holes of the second blocks are used as the inner cavity of the bottom plate part, and the inner cavity of the bottom plate part is closed. The basement waterproof structure can reduce the problem of water seepage in the basement.

The invention relates to the technical field of prefabricated stairs, and discloses an assembly type building prefabricated stair structure which comprises threaded columns, the two threaded columns are rotationally connected to the middles of the inner sides of corresponding hollow plates correspondingly, rack plates are connected to the outer sides of the threaded columns in a threaded mode, and gears are rotationally connected to the front sides and the rear sides of the interiors of the hollow plates correspondingly. The top of the gear is fixedly connected with a threaded sleeve, the top of the threaded sleeve penetrates through the hollow plate and is in threaded connection with a first threaded block, the top of the first threaded block penetrates through the supporting plate and is fixedly connected with a mounting plate, a drainage assembly is arranged on the inner side of the supporting plate, and a holding assembly is arranged on the outer side of the stair plate. The mounting plate and the first threaded block are inserted into the supporting plate, the threaded column is rotated to drive the gear and the threaded cover, the first threaded block is made to move, the supporting plate is fixed between the hollow plates through the mounting plate, and the stair plate is convenient to replace. The sealing rubber strips enhance waterproof sealing, the preformed holes and the drainage grooves are matched for drainage, and the drainage effect is improved.

The utility model discloses a ribbed hollow square pile which comprises a square pile body, a through hole penetrates through the center of the square pile body, plane portions are arranged on the four outer side faces of the square pile body, and the two radial sides of each plane portion are connected with first protruding portions which extend and protrude outwards. The side, away from the through hole, of the first protruding part is connected with a second protruding part parallel to the plane part, the intersecting edge of every two adjacent second protruding parts forms a sharp corner part, the two axial ends of the square pile body are further provided with end structures, the pile surface area is increased by adjusting the shape of the hollow square pile, and the hollow square pile is more compact. Meanwhile, compared with an existing X-shaped pile, the structure with the parallel rib edges is convenient to stack, the soil squeezing effect is reduced compared with a hollow square pile with the same bearing capacity, and compared with a common square pile, the material consumption of the same surface area is lower.

The application discloses a kind of fence post construction methods, complete the pouring of post foundation in construction site, a few fixed upwards connecting steel bars are pre-poured on post foundation, then the prefabricated hollow structure post prefabricated piece is erected on foundation and is sleeved outside exposed connecting steel bars, pours a section of post-poured section in the lower cavity of post prefabricated piece again, so that post-poured section is integrally connected with post foundation by connecting steel bar, and its characterized in that, the post prefabricated piece is integrally connected by pouring concrete in the pouring connection space interlayer at the position of post cylinder body circumferential side after splicing post cylinder body in length direction, and is obtained.The application has the advantages of being capable of reducing processing difficulty, improving production and processing efficiency and better guaranteeing product shape quality requirements.

The application discloses a full-assembly hollow plate type building structure and a mounting method thereof, and belongs to the technical field of building industrialized assembly type structures, and aims to solve the problems of large on-site wet work amount, welding or bolt connection, complex construction and large self-weight of components of an existing plate type assembly building connecting joint. The full-assembly hollow plate type building structure is characterized in that: prefabricated hollow floor slabs with bidirectional lengthways bottom reinforcement and bidirectional support surface reinforcement and prefabricated hollow wall slabs with double-layer bidirectional steel mesh are adopted; wall slab connecting pieces and wall slab connecting pieces with toothed plates are pre-welded and formed in a factory; a closed rectangular steel pipe-shaped cavity is formed by toothed plate occlusion at a corner part on site, and concrete is poured to form a rectangular steel pipe concrete column; upper and lower prefabricated hollow wall slabs are connected by setting wall slab vertical lap reinforcement in a second hollow channel and filling components by post-pouring connection; zero welding, no bolt connection and less wet work in full-assembly construction are realized; and the overall stress performance of the building is ensured by a unique joint structure.

A system and method for mine top support of a structure includes a top support device including a cylindrical cover defining a hollow interior and a plurality of bamboo segments disposed within the hollow interior and extending coaxially with an axis of the cylinder. In addition, the top support device with the cylindrical coating comprises a hollow interior, a plurality of bamboo sections are arranged in the hollow interior and are coaxial with the axis of the cylinder, gaps are formed between adjacent bamboo sections, and filling materials such as polyurethane foam are injected into the gaps to keep the bamboo sections positioned when the top support device bears loads. The support device is configured to be loadable and yieldable in a predetermined manner to control sudden failure of the mine roof.

The utility model discloses a fabricated concrete frame structure, which belongs to the technical field of concrete structures and comprises a base, a hollow prefabricated column is fixedly connected to the upper end of the base, an extension column matched with the hollow prefabricated column is inserted into the hollow prefabricated column, and four beam-column joint components distributed in an array are mounted at the outer end of the extension column. A beam assembly is installed on the extension column through a beam column joint assembly, a prefabricated floor slab is installed on the beam assembly, a guide hole is formed in the position, corresponding to the beam column joint assembly, of the extension column, and a guide assembly is installed on the inner side of the guide hole. According to the utility model, installation errors in a certain range can be allowed to be corrected and aligned finally through the guiding effect of the guiding assembly, the installation is convenient, meanwhile, the alignment of hole sites is also convenient, and the supporting plate can be moved and adjusted, so that the size errors possibly caused by integral forming can be avoided; and it is guaranteed that the cross beam assembly is accurately and fixedly installed, and deviation and deformation are not prone to occurring.

According to the post-grouting steel column base and the construction method, the steel column base adopts a hollow steel pipe, and the bottom of the steel column base is made into an expanded horn mouth; grouting holes are formed in the bottoms of the steel column feet; both the grouting hole and the hand hole are provided with threads and plugs; a civil foundation connected with the steel column base is provided with a cup opening with the narrow upper portion and the wide lower portion, and anchoring steel bars are embedded in the cup opening. The steel column base is installed on site through two times of grouting, the first time of grouting is conducted from the edge of a cup opening, the cup opening on a civil engineering foundation is fully filled, and meanwhile the original open column base is changed into a closed space; after first grouting hardening, the upper steel column and the steel beam which are connected with the steel column base can be installed; the micro-expansion grouting material is poured from a grouting opening in the lower end of the steel column foot for the second time of grouting, and the hole is locked by screwing a bolt after the micro-expansion grouting material is fully grouted until the grouting material is hardened. The construction site civil engineering foundation can be independently constructed, and adjustment space is available during installation; the connection strength is higher than that of a traditional mode.

The utility model discloses a kind of molds of making controllable board thickness concrete cushion block, contain two hollow cylinder bodies of coaxially setting and axial spacing adjustment plug-in in opposite direction;Each hollow cylinder body is by two symmetric half mould cylinder opposite splicing fixed, the section of hollow cylinder body is the hollow piston shape structure of top and bottom open mouth, the piston rod end of this hollow cylinder body is mutually plug-in and axial spacing adjustment connection, and concrete groove is integrally made in the piston end of hollow cylinder body;The rubber clamping key of sealing concrete slurry and isolating hollow cylinder body piston rod section and piston section is compositely bonded in the piston rod section inside of hollow cylinder body.The mold rigidity is big, can ensure not to deform when pouring, and height can be accurately adjusted, realize repeated use;It can make cushion block of different height, applicable to various board thickness requirements, while guaranteeing steel bar protective layer thickness, effectively prevent missing steel bar, with the advantages of simple operation, material saving and reusable, with higher popularization and application value.

The application provides a prefabricated hollow core reinforced pile construction method with inner and outer wings, and belongs to the field of prefabricated hollow core reinforced pile construction. The method comprises a reinforced pile body and a wing expansion device. A plurality of expansion units are arranged along the axial direction of the reinforced pile body. Each expansion unit is circularly arranged along the center line of the reinforced pile body and comprises a plurality of wings. During construction, a hole is first opened on the ground, and slurry is injected into the hole. Then, the reinforced pile body, in which the wings are temporarily fixed by iron sheets to an unfolded state and the bottom is closed, is placed in the hole, so that the slurry wraps the reinforced pile body on the outside. The wing expansion device is lowered into the hollow part of the reinforced pile body to the uppermost position of the wings. The uppermost wings block the wing expansion device from continuing to be lowered. At this time, the wing expansion device is opened to push the wings outwards towards the outer wall of the reinforced pile body. Then, the wing expansion device continues to be lowered, and the above steps are repeated to sequentially push the wings outwards towards the outer wall of the reinforced pile body from top to bottom.

The invention belongs to the technical field of concrete reinforcement, and particularly relates to a perforation reinforcing method of a large-span steel reinforced concrete beam, which comprises the following steps: step 1, reinforcing a steel plate: fixedly connecting the steel plate at a perforation part of the beam so as to increase the stress bearing capacity of the perforation part; 2, carbon fiber reinforcement, wherein carbon fiber cloth or a carbon fiber sheet is used for conducting bonding reinforcement on the perforated part, and the bearing capacity of the perforated part is improved; a hollow cylinder or a hollow pipe is reserved in the perforated part of the beam, then concrete is grouted or poured, the metal rib is pre-buried in the hollow cylinder or the hollow pipe, and the bearing capacity of the perforated part of the beam is improved; according to the method, the strength and the bearing capacity of the beam are improved by pouring the reinforced concrete, meanwhile, the problems of cracking and creep deformation of the beam can be effectively solved, the bearing capacity and the durability of the beam can be remarkably improved, and the construction efficiency is high.

The utility model discloses a raised floor and stone ground joining, installing and fixing structure which comprises a hollow supporting bottom piece, a slotting supporting column is fixedly connected to the top of the hollow supporting bottom piece, a transverse groove is formed in an inner cavity of the slotting supporting column, and a positioning fixing column is connected to the inner cavity of the slotting supporting column in a sliding mode. A positioning fixing column is arranged on the surface of the transverse groove, a supporting round head is welded to the top end of the positioning fixing column, a plate round head is fixedly connected to the top end of the supporting round head, supporting round rods are slidably connected to the left side and the right side of an inner cavity of the transverse groove, and a spring is welded between a bevel head and the inner cavity of the transverse groove. And when the plate round head is higher than the position of the inclined plane head, the inclined plane head is reset under the action of the spring, and the installation of the slotted support column is completed, so that the purposes of facilitating the installation of the raised floor support and accelerating the laying process of the support can be achieved.

The utility model belongs to the technical field of metal molds, and particularly relates to a metal mold convenient to disassemble and assemble, which comprises a supporting mold frame, an inner mold is mounted in the supporting mold frame, two groups of positioning components are fixedly mounted on the side edge of the supporting mold frame, each positioning component comprises a hollow block, a limiting column is mounted in each hollow block in a sliding manner, and the limiting columns are fixedly mounted on the supporting mold frame. Limiting columns are fixedly installed on the supporting mold frame, limiting blocks are fixedly installed on the limiting columns, the parts, in the hollow blocks, of the limiting columns are sleeved with limiting springs, limiting holes are formed in the limiting columns, limiting pins are slidably installed on the hollow blocks, and two sets of positioning notches are formed in the inner mold. After the inner mold is placed in the supporting mold frame, the limiting pins on the hollow blocks are pulled upwards, the limiting holes are formed in the limiting pins, and therefore the limiting springs abut against the limiting blocks on the limiting columns into the positioning notches in the inner mold, the inner mold is limited, the mode of fixing the inner mold is simple, and the disassembly and assembly difficulty of the inner mold is reduced.

The invention relates to an improved masonry support for a cavity wall construction. In particular, the invention provides a masonry support comprising a bracket for affixing the masonry support to an

The invention relates to the technical field of composite floor slab transportation, in particular to an auxiliary structure for transporting a steel tube web member truss prestress composite floor slab, which comprises a base plate, the base plate is lapped on a prestress bottom plate, a plurality of upper chord ribs are arranged above the prestress bottom plate, and a hollow steel tube web member truss is fixed between the upper chord ribs and the prestress bottom plate. A plurality of prestressed steel bars are fixedly inserted into the surfaces of the prestressed bottom plates, preformed grooves are formed in the surfaces of the base plates, the upper chord ribs are sleeved with the preformed grooves, lap joint grooves are formed in the top surfaces of the base plates, and when the two prestressed bottom plates are stacked, one prestressed bottom plate is inserted into the lap joint groove of the base plate at the top of the other prestressed bottom plate; the supporting device has the beneficial effects that a good supporting effect is achieved on the prestressed bottom plates stacked on the supporting device, meanwhile, the prestressed bottom plates are limited in the corresponding lap joint grooves, the situation that the prestressed bottom plates swing front and back in the transportation process is effectively avoided, the transportation safety is improved, the damage risk caused by floor shaking is reduced, and the engineering quality is guaranteed.

The invention discloses a casing multi-branch well construction process which comprises the following steps: drilling a No.1 branch well hole, putting a conventional sand control pipe column into the No.1 branch well hole, and carrying out gravel filling operation; a hollow whipstock casing windowing system is downwards arranged on the upper portion of the first branch well hole, after the hollow whipstock casing windowing system is downwards arranged in place for orientation, pressure is applied and stabilized in the pipe, anchoring is completed, and pilot hole drilling operation is conducted; 2, a branch well hole is drilled according to a conventional well drilling mode, a branch well gravel packing sand control pipe column is put down, a foam metal sand control screen pipe is arranged on the upper portion of a window opening, and gravel packing operation is carried out; a hollow whipstock casing windowing system is put down on the upper portion of the second branch well hole, anchoring and third well hole drilling are completed, a branch well gravel packing sand prevention pipe column is put down, and gravel packing operation is carried out; and finally, the main borehole operation is completed according to the branch borehole operation steps. Sand prevention and production operation of the main and branch boreholes are achieved at the same time, mechanical supporting is achieved at windows of the main and branch boreholes, the production life of the boreholes is prolonged, and the single-well recovery efficiency is improved.

The utility model relates to the technical field of building engineering, disclose a kind of building engineering mixing device, including base, the upper surface of base is provided with mixing tank and flushing mechanism, the upper side of mixing tank is detachably connected with hollow jar cover, the upper surface of hollow jar cover is provided with driving element;Through the cooperation between flushing mechanism, driving element, mixing mechanism, driving mixing mechanism is rotated by driving element, to facilitate the material in mixing tank is stirred, improve the uniformity of stirring, simultaneously, the position adjustment of mounting plate is facilitated using electric push rod, to facilitate the vertical rod is inserted into mixing tank, water is kept in mixing tank inner wall by the spray head on riser, simultaneously, the material cleaning on mixing mechanism is facilitated, the workload of manual cleaning is reduced, to improve the cleaning efficiency of mixing tank inner wall, easy to operate, improve practicality.

The scrap iron blocking protection device for flange end face polishing comprises a blocking frame, a polishing component, a supporting table and a scrap storage bin, the blocking frame is of a hollow structure, a polishing cavity used for providing a polishing space for the flange end face is formed in the blocking frame, and a set of partition plates used for supporting the lower end of the blocking frame are arranged at the lower end of the blocking frame. A set of upper bin doors used for opening and closing the front end of the grinding cavity is arranged on the front side of the material blocking frame, and a set of supporting tables used for supporting flange workpieces are arranged in the middle of the interior of the grinding cavity. The flange polishing device has the advantages that a flange workpiece to be machined is placed on the supporting table and fixed through the side clamping component, the guiding electric cylinder is started to drive the first moving base to move downwards along the front moving rail, the polishing installation head makes contact with the end face of a flange, and the motor drives the polishing device to rotate for polishing operation; a closed grinding cavity formed by the material blocking frame can effectively block splashing scrap iron.

The invention discloses a movable support platform for building a movable decoration background, and relates to the technical field of support platforms, the movable support platform comprises a bottom frame, the bottom frame is a rectangular square frame formed by welding hollow steel pipes, a supporting mechanism is installed in the bottom frame, the supporting mechanism comprises a cross beam, the cross beam is fixedly welded in the middle of the bottom frame and is transversely arranged, and the cross beam is fixedly connected with the bottom frame. A plurality of longitudinal beams are fixedly welded to the two sides of the cross beam at intervals, the outer ends of the longitudinal beams are fixedly welded to the inner wall of the bottom frame, a moving mechanism is installed on the bottom side of the bottom frame, connecting mechanisms are arranged at the two ends of the bottom frame, and a positioning mechanism is installed on the supporting mechanism; according to the invention, the whole set of decoration background is integrated on the movable support platform, an exquisite background formed by combining a plurality of props and materials does not need to be repeatedly constructed each time, considerable and repetitive manpower consumed by construction each time in a traditional mode is avoided, and the manpower input cost is greatly reduced.

The invention discloses a similar design method for an underwater vibration table test model of a reinforced concrete rectangular pier. The method comprises the steps of determining geometric similarity constants; determining an elastic modulus similarity constant, a longitudinal bar strength similarity constant, a stirrup strength similarity constant and a water density similarity constant of the reduced-scale pier; determining an acceleration similarity constant of the reduced-scale pier; determining a structural density similarity constant; determining a flexural rigidity similarity constant of the rectangular section of the reinforced concrete pier; determining the wall thickness of the reduced-scale pier with the hollow structure; determining the weight of the bridge pier in unit height and converting the weight into a mass block of an iron block or a lead block with the same weight; determining a longitudinal bar area similarity constant and a stirrup area similarity constant of the reduced-scale pier; and correcting the stirrup area similarity constant and the like. The method provided by the invention can provide a feasible method for similar design of the reinforced concrete rectangular pier model in an underwater vibration table test.

The aim is to provide a lightweight, inexpensive, and easy-to-install semi-underground unit that is unaffected by the live and dead loads of the upper floors of the building. [Solution] The semi-underground unit of the present invention consists of a factory-produced top cover plate, a residential unit or interior wall unit, a soil pressure reinforcement unit, and a retaining wall block body formed on-site. The top cover plate is provided with an entrance that connects to a stair cover unit connected to the underside of the building's floor. The residential unit or interior wall unit consists of a box-shaped lightweight steel frame formed of a structural seismic-resistant and reinforced structure such as a wall structure. The soil pressure reinforcement unit consists of a box-shaped lightweight steel frame formed of a structural seismic-resistant and reinforced structure such as a rigid frame structure and a wall structure that protrudes and opens to the ground surface. The retaining wall block body consists of a hollow box-shaped concrete wall whose upper surface protrudes and opens to the ground surface.