782 results about "Prefabrication" patented technology

The invention provides box girder bottom and web reinforcement cage framework streamlined production equipment, and belongs to the technical field of box girder prefabrication processing. The box girder bottom and web reinforcement cage framework streamlined production equipment comprises a moving seat which is linearly and slidably mounted on the ground, and a longitudinal bar fixing assembly is arranged at one end of a first rail; an automatic welding machine, a tidying mechanism and a stock bin are sequentially arranged on the moving seat in the direction that the moving seat slides away from the longitudinal bar fixing assembly, the stock bin is used for horizontally arranging and placing the combined stirrups, shifting assemblies are further arranged on the moving seat and located on the two sides of the stock bin, and the tidying mechanism is used for fixing the combined stirrups and positioning longitudinal bars; the automatic welding machine is used for welding the joints of the combined stirrups and the longitudinal bars on the arranging mechanism, and a supporting assembly is arranged below the moving seat. The combined stirrups can be taken out of the stock bin through actions of the arranging mechanism and the material stirring machine, then the automatic welding machine is used for welding, the moving seat moves backwards by a certain distance after one round of welding, the next round of welding of the combined stirrups is carried out, and the welding and manufacturing efficiency of a reinforcement cage framework is improved.

The invention discloses a prefabricated welded water-stop steel plate column stirrup column penetrating structure, tool and construction method, and the construction method comprises the following operation steps: step 1, taking a section of water-stop belt steel plate as a column inner plate water-stop belt, and preparing a prefabricated welded water-stop steel plate column stirrup column penetrating tool, the prefabricated welded water stop steel plate column stirrup column penetrating tool comprises a fixing tool and a clamping tool, and a column inner plate water stop belt is fixed to the fixing tool; the invention relates to the technical field of water stop steel plate column penetrating construction, and has the beneficial effects that a column inner plate water stop belt and a multi-bend column stirrup are pre-welded and spliced in a factory through the prefabricated welding water stop steel plate column stirrup column penetrating tool to form a prefabricated assembly; during construction, only the prefabricated assembly needs to be directly sleeved with the longitudinal rib and bound, operation is easy, the construction efficiency is improved, the construction period is shortened, a large amount of welding work does not need to be conducted on a building site, and the safety coefficient is increased.

The invention discloses a self-resetting multi-section prefabricated assembled pier and a construction method, the self-resetting multi-section prefabricated assembled pier comprises a prefabricated cover beam, a pier column and a pier bearing platform, the pier column is formed by splicing a plurality of prefabricated sections, and is connected with the prefabricated cover beam through the prefabricated section located at the top; the prefabricated bent cap is connected with the pier bearing platform through a prefabricated section located at the bottom in a bell and spigot joint mode, and the non-adhesive prestressed tendons are connected with the prefabricated bent cap and the pier bearing platform and provide self-resetting capacity for the pier. According to the multi-section prefabricated assembled pier with the self-resetting capacity and the construction method, the formworks are prefabricated in a unified mode in a factory, the efficiency is improved while the prefabrication and construction cost is reduced, the mode of prefabricated section splicing and shallow socket connection is adopted, construction in narrow and complex terrains is facilitated, prestressed tendons used for self-resetting are arranged, and the construction efficiency is improved. The overall anti-seismic performance is improved, the integrity, rigidity and bearing capacity of the assembled pier are improved, the service life is prolonged, and meanwhile the maintenance cost is reduced.

The invention relates to a breakwater structure for wave power generation and a construction method of the breakwater structure. The breakwater structure comprises a lower barrel body, an upper caisson and a power generation device. A compartment is arranged in the upper caisson, and the power generation device is installed in the compartment. A wave inlet hole is formed in the wave facing side of the upper caisson, a cast-in-place adjusting node is arranged on the top of the upper caisson, and a wave wall, a cable pipe trench, a detachable road plate and an overhauling device are sequentially arranged above the node. The breakwater structure and the wave power generation system are integrated by adopting standard barrel type foundation factory prefabrication and floating transportation installation and combining cast-in-place joint leveling and the detachable road plates. The structure has the advantages of being convenient to construct, controllable in cost, stable in structure, convenient to maintain and the like, is suitable for wave power generation under medium and small wave conditions, and is particularly suitable for green power supply and coast protection in areas such as ports and islands.

The present application relates to the technical field of nuclear power plant construction, and specifically relates to a method for hoisting a rebar cage for a reactor core of a nuclear power plant. The method comprises the following content: on the basis of a reactor core structure, dividing a rebar cage into a plurality of modules; adapting rebar connection joints to the rebar cage modules; performing rebar cage tool prefabrication in each rebar cage module; on the basis of the prefabricated tool, fabricating a module hoisting tool, and performing a static load test on the module hoisting tool; assembling the rebar cage modules on the ground to form a complete rebar cage; on the basis of the weight and hoisting radius of the complete rebar cage, adapting a lifting sling; and hoisting the complete rebar cage by means of hoisting equipment and the lifting sling. According to the present application, construction costs can be reduced and construction efficiency can be improved.

The utility model relates to a vertical bearing test device for a permanent steel casing pile foundation. The vertical bearing test device comprises a calibration device, a pile foundation fixing device, a displacement monitoring device, a loading device and an auxiliary supporting structure, a concrete mold is installed in the auxiliary supporting structure, and the pile foundation is fixed in the pile foundation concrete mold through a pile foundation fixing device. Pressure sensors are fixed to the two ends of the pile foundation, and the pile foundation is sleeved with a permanent steel casing. The top of the auxiliary supporting structure comprises a cross beam and a vertical beam; the calibration device comprises a vertical beam sliding rail guide frame which is connected to the guide rail in a sliding mode. The calibration device is connected between the cross beam and the vertical beam; the loading device is connected to the bottom end of the middle of the calibration device; a jack is arranged at the bottom of the loading device; the top of the displacement monitoring device is fixed to the bottom of the vertical beam sliding rail guide frame. The utility model has the beneficial effects that the bearing capacity is strong, and the stability is good; the pile foundation displacement monitoring is accurate; the loading process is high in controllability; construction is simple and efficient, and the prefabrication degree is high.

The utility model relates to a walking unit for a magnetic wheel type automatic trowelling machine, which is characterized by comprising a driving motor mounted on a motor supporting platform, and the motor supporting platform is fixedly connected with a walking frame of the trowelling machine; the driving wheel is connected to the driving motor; the transmission belt or the transmission chain is connected with the driving wheel; the two magnetic walking wheel sets are connected to the driving wheel through the transmission belt or the transmission chain. Through the unique magnetic walking wheel set design and the reasonable transmission structure, the walking stability and accuracy of the automatic trowelling machine can be effectively improved, the trowelling operation quality is guaranteed, and the production requirements of the modern large concrete prefabrication industry for high-quality concrete prefabricated parts are met.

The utility model relates to the technical field of inspection wells, and discloses an assembly type composite material inspection well which comprises an upper well body and a lower well body, a water inlet hole and a plurality of water outlet holes are formed in the side wall of the upper well body, and a second sealing ring and a first sealing ring are installed in each water outlet hole and each water inlet hole respectively. A water inlet pipe and a water outlet pipe are installed in the first sealing ring and the second sealing ring respectively, an upper well body is installed on the lower well body, a well lid is installed on the upper well body, a clamping groove is formed in the well lid, a sealing rubber ring is installed in the clamping groove, and the sealing rubber ring is installed between the upper well body and the well lid. Modular design and a multi-sealing structure are adopted, the structural strength is enhanced through flange connection and arrangement of the reinforcing ribs and the triangular supports, external pressure can be resisted, deformation can be prevented, all-directional sealing is achieved through combination of multiple sealing rings and sealant, it is guaranteed that the water meter is accurate in metering and equipment is safe, the construction period is greatly shortened through prefabrication and assembly construction, and the construction cost is reduced. The environmental influence is reduced and the equipment is convenient to overhaul and maintain.

The invention discloses a high-strength lead falling prevention type insulated cross arm, and particularly relates to the technical field of electric power systems, equipment comprises a composite cross arm, a butterfly insulator and a binding wire, a connecting mechanism for fixing the butterfly insulator and the binding wire is arranged on the surface of the composite cross arm, and the composite cross arm is connected with the butterfly insulator and the binding wire through the connecting mechanism. The nut is screwed to be in threaded connection with one end of the bolt, the bottom of the nut extrudes the binding wire and the butterfly insulator, so that the butterfly insulator is fixed to the composite cross arm, the binding wire is fixed to the butterfly insulator, an original galvanized iron piece, an original bolt fitting, an original binding wire and an original butterfly insulator are combined into a whole, factory machining and prefabrication are utilized, and the overall performance of the composite cross arm is improved. The device is assembled before leaving a factory, field processing and assembling are avoided, the working efficiency is further improved, meanwhile, the composite cross arm is made of a novel composite material, the service life of the composite cross arm can be prolonged, the operation cost is further reduced, the construction cost is saved, the process standard is unified, and the construction quality is improved.

The application discloses a supporting excavation method for partitioning and leaving piers of soft foundation, and belongs to the technical field of foundation pit supporting of geotechnical engineering. The method comprises the following steps: S1, integrated quantitative design and digital modeling, defining a composite soil pier unit composed of an artificially reinforced core and an undisturbed soil body, calculating a bearing contribution rate and performing non-uniform layout and stability checking; S2, prefabrication and accurate implantation of the structural soil pier unit; S3, partitioned asynchronous excavation based on the structural soil pier, batch excavation of "warehouse rooms" and immediate support of exposed side walls; S4, formation of a permanent composite foundation, rigid connection of the bottom plate and the soil pier through a three-level structural connection system, and construction of a waterproof drainage system, a stiffness transition zone and a health monitoring sensor network. The application integrates the functions of temporary support and permanent foundation, significantly reduces the engineering cost, improves the foundation bearing capacity and anti-settlement capacity, and realizes intelligent monitoring and active regulation in the whole life cycle.

The invention relates to the technical field of bridges, and provides a segment-assembled corrugated steel web mixed girder bridge and a construction method thereof.The areas, close to bridge piers, of side spans and middle spans are composed of first-class girder sections, and each first-class girder section comprises a first concrete top plate, a first concrete bottom plate and a first corrugated steel web; the midspan area is composed of a second type of beam sections and comprises a steel bottom plate, an ultra-high performance concrete combined top plate and a second corrugated steel web; and the combined beam section is connected between the two beam sections to realize smooth transition. Through the longitudinal partition structural design, the advantages of the respective materials are fully played, the side span-mid span ratio can be compressed to 0.35-0.60, and the span capacity is remarkably improved. An ultra-high-performance concrete combined top plate is adopted in the midspan, and the dead weight is reduced by 50%; the steel bottom plate is used for replacing a concrete bottom plate, and the cracking risk of the midspan bottom plate is thoroughly eliminated. Segmental prefabrication and assembly construction is adopted, the process is standardized, the adaptability to soft foundations is high, and the problems of midspan downwarping and web cracking are solved.

The invention provides an underground comprehensive pipe gallery belt water-stop disassembly-free end mold and a construction method. The underground comprehensive pipe gallery belt water-stop disassembly-free end mold comprises annular prefabricated concrete, and annular water-stop belts are arranged on the end faces of the two sides of the prefabricated concrete; the prefabricated concrete is further provided with an annular flexible deformation joint, and an annular U-shaped water stop strip is arranged in the flexible deformation joint; the flexible deformation joint is located between the two end faces of the prefabricated concrete and divides the prefabricated concrete into two parts. An outer step and an inner step which extend outwards are arranged on the two sides of the annular waterstop, and the height of the outer step and the height of the inner step are larger than or equal to the height of the annular waterstop. A horizontal waterstop reserved hole is formed in one side of the annular waterstop. According to the scheme of end mold prefabrication and disassembly-free and side wall cast-in-place, the structure which is complex in structure and high in anti-permeability performance contribution is arranged on the disassembly-free end mold, factory prefabrication is conducted, and large-batch, high-quality and low-cost production can be achieved through batch production and equipment assistance. And the size of the disassembly-free end mold is relatively small, so that the transportation cost is not high.

The application discloses a flexible road suitable for a collapse area of a high water level mine area and a construction method thereof, and relates to the technical field of foundation treatment. The flexible road is sequentially provided with a drainage base layer, a self-adaptive cushion layer, an integrated anti-seepage and drainage layer, a flexible stable layer and a surface layer from bottom to top. The construction method divides a risk area through digital twinning, adopts foundation three-in-one control pre-disposal, is matched with factory prefabrication, on-site quick insertion installation and intelligent construction of unmanned aerial vehicles, AGVs and the like, and forms a whole-cycle closed loop through completion detection and intelligent monitoring. The application realizes three-dimensional seepage control and deformation self-adaptation, solves the problems of seepage and subsidence in the collapse area, is efficient and controllable in construction, and improves long-term stability of the road.

The utility model discloses a template-free central anti-collision guardrail structure prefabricated by pouring concrete in the middle. The template-free central anti-collision guardrail structure comprises a beam body, a prefabricated body, a steel reinforcement framework and a middle core body, a first reinforcing steel bar is pre-buried in the beam body; the prefabricated body is made of concrete, the prefabricated body abuts against a beam body, the prefabricated body comprises a base shell and a guardrail body, and a hollowed-out space with a downward opening is formed in the middle of the base shell; the prefabricated body is arranged, the hollowed-out space is formed in the middle of the base shell, after the prefabricated body is hoisted, the steel reinforcement framework can be connected with the first steel reinforcement in a coupling mode, factory prefabrication and on-site rapid hoisting can be achieved, the bridge deck pavement construction procedure is not affected, concrete is secondarily poured into the hollowed-out space through the pouring hole, and the middle core body is formed; and a template is not needed in the construction process, so that the construction progress is greatly accelerated, the efficiency is greatly improved, the pouring quality can be guaranteed, noise and dust residue pollution generated in the construction process can be reduced, and the method is environmentally friendly and can be widely popularized and used.

A photovoltaic flexible support wind-resistant structure comprises a supporting frame, a plurality of mounting rods, a first connecting base, a second connecting base, a third connecting base and a connecting assembly, one end of the first mounting rod is rotationally connected with the first connecting base, one end of the second mounting rod is rotationally connected with the second connecting base, and one end of the third mounting rod is rotationally connected with the third connecting base. The other ends of the first mounting rod, the second mounting rod and the third mounting rod are connected with the connecting assembly to form a spatial conical structure; at least one of the first mounting rod, the second mounting rod and the third mounting rod is detachably connected with the corresponding connecting base or connecting assembly, and when one of the first mounting rod, the second mounting rod and the third mounting rod is in a detached state, the wind-resistant structure can be folded to form a plane structure. In this way, factory overall prefabrication and modular folding transportation can be achieved.

This invention relates to the technical field of construction engineering, and in particular to a prefabrication and installation method for a dry dock entrance, comprising the following steps: Step A, construction of an underground anti-seepage wall in the dry dock entrance area, layered and segmented construction of the dry dock entrance concrete, one-time pouring of concrete for the lower part of the dock sill and one-time pouring of concrete for the main body of the dock pier; Step B, design and prefabrication of dock sill stones and prefabricated dock pier stones; Step C, installation of the prefabricated dock sill stones and prefabricated dock pier stones. This invention features prefabricated dock sill stones and dock pier stones used in the construction of the dry dock entrance. The layered and segmented pouring method during construction effectively controls temperature cracks in the main concrete of the dry dock entrance; the stainless steel panels inlaid on the contact surfaces of the prefabricated dock sill stones and prefabricated dock pier stones with the dock gate greatly improve the flatness of the sealing surface; furthermore, the prefabricated structure effectively simplifies the construction process and reduces construction costs.

This invention provides a flood and freeze protection zone metering device, comprising a well body. An inlet pipe is installed and connected to one side wall of the well body, and an outlet pipe is installed and connected to the other side wall. Elastic sealing rings are provided at the connection points of the inlet and outlet pipes with the well body. This invention adopts a factory prefabrication and modular assembly method. The well body and internal metering components are pre-assembled in the factory, requiring only hoisting, positioning, and pipe connection on-site. Compared to traditional brick or concrete-cast well bodies, the construction cycle is significantly shortened, unaffected by weather, and installation efficiency is significantly improved. This invention integrates multiple sensors within the same well body, using a data acquisition and transmission terminal for unified power supply, unified data acquisition, and unified uploading to a digital platform. This solves the problem of scattered information in traditional zone metering devices, achieving comprehensive monitoring and remote management of pipeline flow, pressure, water quality, leakage, and well body status.

The invention provides a tower drum mold, a prefabricating method, an embedded part, a tower drum prefabricating structure and a tower drum, the tower drum mold comprises a mold main body with a prefabricating space, the prefabricating space is used for prefabricating a prefabricating structure main body of the tower drum, and the mold main body is provided with an embedded opening communicating with an external space of the mold main body and the prefabricating space; the pre-buried opening is used for allowing the other part of a pre-buried part needing to be partially arranged in the prefabricated space and pre-buried in the prefabricated structure body to penetrate through and extend to the outer space of the mold body. The embedded part is conveniently embedded in the prefabricated structure main body of the tower drum, and when the embedded part is a tower crane buttress embedded part, the tower crane can be connected with the tower drum by being connected with the part, reserved outside the prefabricated structure main body of the tower drum, of the embedded part, so that the tower crane can be supported through the tower drum; the probability of occurrence of hoisting accidents of the tower crane is reduced, the hoisting stability and safety of the tower crane are improved, the hoisting difficulty is reduced, the dead weight of the tower crane is reduced, and the hoisting cost is saved.

This utility model belongs to the technical field of steel support beams, and in particular to a prefabricated building support beam, including a base, a support seat fixed to the top of the base, a vertical support beam inserted into the top of the support seat, four fixing slots 1 on the outer wall of the vertical support beam, and four through-holes on the outer wall of the support seat, each with a corresponding locking plate slidably connected inside, one end of each locking plate being inserted into the corresponding fixing slot 1. This utility model, by setting up a base, support seat, vertical support beam, fixing slot 1, locking plates, limiting seats, horizontal support beam, fixing slot 2, fixing blocks, springs, and a transmission assembly, allows for simultaneous movement of the four locking plates and four fixing blocks after the vertical and horizontal support beams are placed on the base during the prefabrication process. The movement of the locking plates limits and fixes the vertical support beam, and the movement of the fixing blocks limits and fixes the horizontal support beam.

The invention provides a fabricated continuous free-form surface laminated wood ceiling system and a construction method thereof. The system comprises a main structure steel beam, a steel column flange, a free-form surface laminated wood main body panel, a dovetail joint structure and a hidden F-shaped metal connecting piece. The laminated wood main body panel completes back rough machining, joint machining, turn-over front rough machining and front accurate machining in the factory stage through an industrial robot, and integrated high-precision manufacturing of the free-form surface appearance and the assembly joint is achieved. Adjacent laminated wood components are connected through customized dovetail tenons, the laminated wood main body panels are in prefabricated connection with the main structure steel beams through hidden F-shaped metal connecting pieces, and the laminated wood main body panels are not exposed out of a visible face after being installed. The ceiling modules are integrally assembled and glued in a factory, and are integrally hoisted and connected with steel column flanges and bolts on site to complete installation, so that an assembly type construction mode with high prefabrication rate and low field dependence is realized.

The invention relates to the technical field of sand gravel stratum foundation construction, in particular to sand gravel stratum scour prevention wall grooving equipment and a self-adaptive grooving method, and aims to solve the technical problem that large-range groove milling in the prior art easily causes production safety due to uncertain properties of a sand gravel stratum. The groove body is located on a stable supporting system constructed by the groove edge prefabricating assembly and the pouring positioning assembly on the side of the width of the groove body, a loose space of a gravel layer generates vibration and impact along with contact between a reciprocating groove milling assembly head and the gravel layer, flowing of the surrounding gravel layer is intensified, slurry can flow out step by step when groove milling is not conducted, and therefore the effect that the groove body is not subjected to groove milling is achieved. Under the interception of the interception template, the gravel layer on the width side of the actual groove body is more compact and stable, so that the safety is greatly improved; and after the groove type is detected, the groove edge prefabricating assembly and the pouring positioning assembly also provide a positioning foundation and a fixing foundation for prefabricating and pouring, so that the construction process is safer and more reliable.

The invention relates to a pier and a construction method thereof, and belongs to the technical field of building construction. The bridge pier construction method comprises the following steps that a reinforcement cage is bound based on an original cast-in-place construction reinforcement design drawing of a pier column of a to-be-built bridge pier, a shell pouring inner mold composed of an air bag and an evanescent mode is installed in the reinforcement cage, and the shell pouring inner mold is placed in a shell pouring outer mold so that a shell pouring cavity can be formed between the shell pouring inner mold and the shell pouring outer mold; concrete is poured into the shell pouring cavity, and a pier column shell with a reinforcement cage is obtained; a pier column supporting frame is built on a pier construction site, and a prefabricated pier column shell with a reinforcement cage is hoisted to the pier column supporting frame; a bearing platform outer formwork used for pouring a bearing platform is installed on the periphery of the pier column supporting frame, and the bearing platform is formed through pouring; and concrete is poured into a cavity defined by the pier column shell, and the pier column is formed. According to the pier construction method, on the premise that the pier construction quality is guaranteed, the construction period is greatly shortened, and the construction cost is reduced.

The application discloses a general formwork for concrete prefabricated components and a construction method, and relates to the technical field of bridge construction. The general formwork for concrete prefabricated components comprises two general formwork components. Each general formwork component comprises at least one general formwork structure. Each general formwork structure comprises a flange plate formwork structure, a partition plate formwork structure and a support frame. One end of the flange plate formwork structure is connected with one end of the partition plate formwork structure. The support frame is provided with a first adjusting structure and a second adjusting structure. The first adjusting structure is used for adjusting the slope of the flange plate formwork structure. The second adjusting structure is used for adjusting the angle of the partition plate formwork structure. The general formwork for concrete prefabricated components has the general property and can satisfy the prefabrication of flange plates with different slopes.

The utility model provides a water conservancy pipeline outer wall steel seal marking device, including mainboard, first servo motor, screw rod, first track, the front surface fixedly connected with first servo motor of mainboard, the output fixedly connected with screw rod of first servo motor, the outer surface screw thread connection of screw rod has the slide, the front surface fixedly connected with first track of mainboard, the upper portion of slide and first track swing joint. The utility model's advantage lies in: the workman can put the next steel pipe that needs to mark to prefabrication station and prepare while processing the current steel pipe, realizes the flow operation. Sensor is used for detecting whether steel pipe is loaded in place. When the operator loads steel pipe in place, the sensor cannot detect steel pipe, can prompt the operator to start marking (or connect safety door lock / starting condition). Can reduce the waiting time, promotes rhythm feeling. The design of preloading and photoelectric switch cooperation can improve man-machine cooperation efficiency.

The invention discloses a steel rib reinforcing and efficient connecting system for a light integrated board and a light inner partition wall board, the steel rib reinforcing and efficient connecting system for the light integrated board comprises a composite welding steel skeleton, the composite welding steel skeleton comprises a main frame, a reinforcing structure and a plurality of connecting pieces, the reinforcing structure is welded to the outer side of the main frame, and the connecting pieces are welded to the outer side of the main frame; the connecting pieces are fixed to the edges of the main frame and used for being connected with an external structure. Wherein the main frame comprises at least two keels and at least two liner tubes, the keels and the liner tubes are vertically connected, and the keels and the liner tubes are arranged together in a latticed structure. Through the application of the invention, a built-in reinforcing and efficient connecting system suitable for the light inner partition wall board is provided, the built-in reinforcing and efficient connecting system is particularly suitable for comprehensive improvement of bending resistance, shearing resistance, stability and the like of the light inner partition wall board, and the service life of the light inner partition wall board is further prolonged; and the prefabrication rate is high, the construction speed is increased, and the requirement for light weight is met.

The utility model belongs to building industrialization technical field especially, and it is a kind of assembly and decoration integration light steel structure self-supporting integrated box type floor slab, it is characterized in that, including light steel frame, the group of few Chinese characters keel that is arranged in the internal cavity of this light steel frame, the upper integrated decorative cover plate that is covered in the outside upper of light steel frame, the lower integrated decorative cover plate that is covered in the outside lower of light steel frame, the heat preservation sound insulation board or extruded sheet that is set in the lower integrated decorative cover plate, the heat preservation sound insulation board that is set in the upper integrated decorative cover plate, the steel bearing plate that is set in the upper light steel frame.The utility model forms closed box body by cold-formed steel frame and double-layer cover plate, integrates heat preservation sound insulation layer inside, realizes 100% factory prefabrication, and this floor slab adapts robot automatic production, has the advantages such as light weight, high strength, energy saving, fast installation, is applicable to prefabricated building and green low-carbon building, civil building and industrial building.

The invention discloses a composite mold for an equipment foundation reserved bolt hole and a construction method of the composite mold, and belongs to the technical field of building construction. The mold comprises a bottomless and uncovered cylindrical steel plate outer frame formed by butt joint of a plurality of metal plates through inclined faces, and the bottomless and uncovered cylindrical steel plate outer frame is filled with a dissoluble foam core. The construction method comprises the steps of mold prefabrication, positioning installation, concrete pouring, core body removal, outer frame removal and hole cleaning. A chemical solvent is poured to decompose the foam core body, the internal space is emptied, then a plate of the steel plate outer frame is stressed inwards to be separated from concrete and taken out, lossless dismantling is achieved, and the problem of hole opening concrete cracking caused by a traditional method is effectively solved. The die and the method have the advantages of high hole forming precision, smooth hole wall, convenience in construction, high efficiency, low cost and reusability of the outer frame.

The present application relates to the technical fields of concrete tetrahedron prefabrication, and particularly relates to a hook replacement mechanism and a tetrahedron formwork dismounting device, wherein the hook replacement mechanism comprises a mounting assembly, a jacking piece and a mounting piece, the jacking piece is arranged on one side of the mounting piece, a reset assembly comprises a back pressure piece and a reset piece, the back pressure piece is arranged on one side of the mounting piece, the reset piece is arranged in the mounting piece, the mounting piece comprises a mounting cylinder and an elastic clamping frame which is slidably arranged on one side of the mounting cylinder, the jacking piece comprises a jacking block which is slidably arranged in the mounting cylinder, and one end of the jacking block is in contact with the elastic clamping frame, the mounting assembly and the reset assembly are used in cooperation, the sidewall hook of the tetrahedron prefabricated formwork can be quickly dismounted, replaced and fixed and installed, and no special dismounting and installing tool is needed during the dismounting and installing process, and the dismounting is convenient.

This invention discloses a prefabricated V-shaped rigid frame bridge and its construction method. The prefabricated V-shaped rigid frame bridge includes: pier foundations, at least two V-legs, and a main girder. The V-legs are composed of multiple prefabricated segments stacked together, with the bottom fixed to the pier foundation via a post-cast section and the top having a cast-in-place section. The main girder includes a No. 0 segment beam and multiple symmetrically arranged prefabricated segments. The prefabricated segments of the main girder are constructed using the inverted beam method, i.e., the top slab, then the web, and finally the bottom slab are prefabricated in sequence. The cast-in-place section of the No. 0 segment beam is integrally cast with the top cast-in-place section of the V-legs. This invention achieves rapid and standardized prefabrication and assembly of variable cross-section beams and V-legs through prefabrication and inverted beam method templates, shortening the construction cycle, reducing the risks of high-altitude operations and traffic interference, improving quality and durability, and possessing economic and environmental advantages.

The invention relates to the technical field of marine parts, and discloses a flexible and convenient upper rudder bearing and upper rudder bearing machining equipment, the flexible and convenient upper rudder bearing comprises a rudder bearing shell, a plurality of evenly distributed through holes are formed in the upper portion of the rudder bearing shell, and a plurality of thrust blocks are fixedly installed on the periphery of the rudder bearing shell; the rudder bearing frame is arranged above the rudder bearing shell; the radial bearing is arranged on the inner wall of the rudder bearing shell, and a rudderstock is sleeved with the radial bearing during installation; the axial bearing is arranged between the rudder bearing shell and the rudder bearing frame; the framework oil seal is arranged at the bottom of the joint of the radial bearing and the rudder bearing shell; and the protective sleeve is installed on the outer side of the rudder bearing shell, a plurality of blind holes are formed in the top of the protective sleeve, and the through holes are used in cooperation with the blind holes. By means of the prefabrication mode, the upper rudder bearing has a complete assembly state when being delivered to a shipyard, the shipyard only needs to connect and fix the rudder bearing shell and the rudder bearing frame through common bolts, and the installation period of a rudder system is greatly shortened.