Showing papers on "Portal frame published in 2012"

Optimum joint detail for a general cold-formed steel portal frame

Abstract: In cold-formed steel portal framing systems that use bolted moment connections, formed through brackets, for the eaves and apex joints, it is well-known that the joints are semi-rigid, have finite connection-lengths and limited moment capacity. For such frames, it is therefore necessary for these joint effects to be taken into account when conducting frame design and analysis. However, as the semi-rigidity and the finite connection-lengths of each joint influence the bending moment distribution as well as the deflected profile of the frame, the joint detail for the eaves and the apex should not be designed independently of the frame. In this paper, a method of determining the optimum joint detail is described. It is demonstrated that careful selection of the joint detail can result in as much as a 25% increase in efficiency of the frame. Including joint effects explicitly into the design process provides better opportunities to devise the most appropriate balance between joints and member properties and t...

An experimental and numerical investigation on the cyclic response of a portal frame pier belonging to an old reinforced concrete viaduct

Abstract: SUMMARY This paper deals with the assessment of the seismic response of a portal frame pier belonging to an old reinforced concrete viaduct. A series of tests, consisting of cyclically imposed displacements, were carried out on three 1:4 scale mock-ups. The objective of the experimental campaign is twofold: (1) identification and evaluation of the local failure mechanisms and (2) calibration of a numerical model including all observed nonlinear phenomena. The experimental results show that the shear strength of the transverse beam and of the beam–column joints characterizes the post-elastic behavior of the piers. Other phenomena, like bond-slip and buckling of the longitudinal bars of the columns, typical of old reinforced concrete structures have also been observed. Finally, a numerical model, built in OpenSEES, was calibrated to reproduce in a satisfactory way the experimental results and to provide a reliable tool for the evaluation of the seismic response of the pier. Copyright © 2011 John Wiley & Sons, Ltd.

Wide-breadth light alloy plate welding device

Abstract: The utility model discloses a wide-breadth light alloy plate welding device. A portal frame is arranged on a worktable; X-axis ribbon motor bearing, a Y-axis ribbon motor bearing and a Z-axis ribbon motor bearing are arranged on the portal frame; and a laser generator, an electric arc welding gun and a welding seam tracking system are installed on the portal frame. A compound heat source generated by laser and electric arc is used as a welding heat source and a numerical control system is used for precisely controlling the portal frame with adjustable motion speed and motion angle in a three-dimensional direction so as to manufacture a large-size light alloy wide-breadth plate; the welding seam tracking system is used for tracking and monitoring the welding process in real time to ensure the precision and performance of a manufactured plate; a requirement on the large-size light alloy plate in the industrial production can be met; a large-size light alloy wide-breadth plate with the size of 0-10m can be manufactured by a splicing and welding technology; the processing efficiency is high; and the manufactured wide-breadth plate has the characteristics of small deformation, low residual stress and good mechanical property.

Stiffness testing device for gas bearing

Abstract: The invention discloses a stiffness testing device for gas bearing, which comprises a platform, a display instrument, a loading mechanism and a portal frame; a measured assembly is arranged on the upper surface of the platform, the upper surface of the platform is an air floating surface, and the gas bearing is formed between the measured assembly and the platform; the portal frame is arranged on the platform; the loading mechanism is arranged on the portal frame and used for exerting a loading force on the measured assembly; and the display instrument is connected with the loading mechanism, and the display instrument carries out real-time display on the loading force exerted by the loading mechanism. By using the stiffness testing device for gas-lubricated bearings disclosed by the invention, the stiffness of a single gas bearing and the stiffness of combined gas bearings can be tested; and the stiffness testing device is simple in operation.

Working jumbo for continuously variable section tunnel lining

Abstract: The utility model discloses a working jumbo for continuously variable section tunnel lining. The two ends of a portal frame moving oil cylinder (3) are connected with an upright post (7) and a vertical support (9) respectively. A side formwork positioning bracket (5) is connected to the outside of the upright post (7). Lateral moving wheels (6) are arranged on a lower beam (13). In the cross section of the jumbo, the upright posts (7) on the two sides are connected through a portal frame beam (2) and a portal frame middle beam (4). In the longitudinal section of the jumbo, the upright posts (7) on the two sides are connected through an upper beam (11), a middle beam (12) and the lower beam (13). A cross support (14) is arranged between every two adjacent upright posts (7). Travel systems (15) are connected with the upright posts (7) and the lower beam (13) respectively. The portal frame beam (2) comprises an inner portal frame beam and an outer portal frame beam, wherein the inner portal frame beam is arranged in the outer portal frame beam. The portal frame middle beam (4) comprises an inner portal frame middle beam and an outer portal frame middle beam, and the inner portal frame middle beam is arranged in the outer portal frame middle beam.

Pressure test calibration mechanical loading device for earthwork testing

Abstract: The invention discloses a pressure test calibration mechanical loading device for earthwork testing. A workbench is arranged at the lower part of a portal frame; a joint in suspended connection witha tested pressure measuring element is in threaded connection to the center of an upper beam of the portal frame; the workbench is internally provided with a worm wheel and worm deceleration mechanism; the worm wheel is provided with a vertical lifting toothed bar, the central screw hole of which is in threaded connection with the joint of the upper beam of the portal frame; the vertical lifting toothed bar is in up-and-down correspondence with the joint; the workbench is provided with a driving main shaft which is parallel with the worm, slides axially and is provided with a hand wheel at the outer end per se; the driving main shaft is provided with an accelerating driving gear and a decelerating driving gear; and the accelerating driving gear and the decelerating driving gear are arranged at the optical shaft section of the worm. According to the pressure test calibration mechanical device, a complete counter-force frame is composed by the portal frame and the workbench; as a vertical force pressurization and deceleration force-increasing driving mechanism is arranged in the workbench, a standard force measurement gauge and a tested pressure measuring element both fixed between the joint of the portal frame and the vertical lifting toothed bar can be stressed at the same time; and the calibration purpose is realized by observing and comparing numerical readings of the standard force measurement gauge and the tested pressure measuring element.

Portal frame type hydraulic press machine

Abstract: The utility model relates to a portal frame type hydraulic press machine which consists of a framework, a worktable, a pressure head and a hydraulic control system. Footing pieces perpendicular to the framework are arranged at the bottom of the framework, the worktable with height adjustable is arranged on the waist of the framework, the hydraulic control system is arranged on a side surface of the framework, the pressure head comprises a cylinder assembly and an ejector rod, is arranged on the top of the 'n'-shaped framework and is erected on a derrick capable of sliding left and right, the cylinder assembly is provided with an oil tube connected with the hydraulic control system, the worktable consists of two transverse side plates, and two working sizing blocks are arranged in the middle of the worktable. A plurality of positioning holes are arranged in middles of a left vertical frame and a right vertical frame, and positioning pins can be inserted into the positioning holes so as to position the worktable at a certain altitude. The hydraulic control system comprises a split pump, a manual control handle, a foot pedal and a connecting rod. The portal frame type hydraulic press machine has the advantages that the height of the worktable can be adjusted according to the size of a workpiece, the split pump can be controlled by manually pressing the control handle or via the foot pedal, and the portal frame type hydraulic press is an ideal tool for operations such as plate pressing and tube bending in a metalworking workshop.

Welding process equipment for self-discharging mining carriage floor

Abstract: The invention discloses welding process equipment for a self-discharging mining carriage floor, which relates to the technical field of special automobile manufacture and comprises a main welding platform, a portal frame and at least one clamping device The surface of the main welding platform is provided with a plurality of openings, and a roller frame with a plurality of rollers at the top is mounted in each opening and connected with a driving cylinder for driving the roller frame to extend out of or retract into the top of the main welding platform The portal frame comprises a beam, vertical columns, wheel carriers and travelling wheels, wherein the vertical columns are connected to two ends of the beam, one wheel carrier is arranged at the lower end of each vertical column, the travelling wheels are mounted on the two wheel carriers, and the portal frame crosses over the upper surface of the main welding platform and is mounted on rails on two sides of the main welding platform through the travelling wheels Each clamping device formed by connecting a clamping cylinder with a mounting frame for the clamping cylinder is mounted on the beam through pulleys Compared with the prior art, the welding process equipment has the advantages that the carriage floor is high in production efficiency and fine in quality, the labor intensity of workers is low, and safety is high

Analytical model to evaluate the equivalent viscous damping of timber structures with dowel-type fastener connections

Abstract: The Equivalent Viscous Damping (EVD) parameter is used to simplify the dynamic problem, passing from a non-linear solution of the system to a simple linear-elastic one. In the case of Direct Displacement-Based seismic Design (DDBD) methods, the EVD value allows direct design of structures, without an iterative computational process. This paper proposes a rational analytical formula to evaluate the EVD value of timber structures with dowel-type metal fastener connections. The EVD model is developed at the ultimate limit state, as a solution of the equilibrium problem related to an inelastic configuration. For a specific joint configuration, the EVD predicted via an analytical model was compared to experimental results. The proposed EVD model was validated using non-linear dynamic analysis on a portal frame, built with dowel-type fasteners arranged in two concentric crowns.

Startlink building system and connections for fibre reinforced polymer structures

Abstract: The research presented in this thesis examines various aspects on connections and joints in Pultruded Fibre Reinforced Polymeric (PFRP) structures. The work is divided into two experimental investigations on the determination of pin-bearing strength and the characterisation of dowel connections and joint for the Startlink Lightweight Building System (SLBS). To support the development of a strength formula for bearing resistance in bolted connections two pin-bearing strength test series were conducted to study the effects of load orientation and hot-wet conditioning. The limitations of existing standard test methods are exposed from a critical review to show that they do not specify the need for a clearance hole, the range of bolt diameters and PFRP thicknesses found in practice. Because the size of tension coupons is found to be too big to be cut from standard structural profiles an alternative test method, having a smaller coupon size, is needed for every pin-bearing strength to be quantified by testing. Reported in this thesis are test results using an in-house test method that requires a maximum blank coupon of 100 mm × 125 mm. Characteristic strength are determined using Annex D7 of Eurocode 0. Pin-bearing strengths for load orientations of 0, 5, 10, 20, 45 and 90o, to the direction of pultrusion are obtained for a web material taken from a standard wide flange section of 9.53 mm thick. In the test matrix there were four sizes of pin diameter from 9.7 mm to 25.4 mm and a minimum clearance hole of 1.6 mm. The in-house test method is shown to satisfactorily determine pin-bearing strength. Another finding from this study is that the Hankinson formula cannot be applied to establish pin-bearing strength at any orientation on knowing the two characteristic strengths at 0o and 90o. To characterise the effect of hot-wet conditioning 0, 45 and 90o specimens were immersed under water for 3000 hours at 40° C. It is found that the average reduction in characteristic strength is in the range of 18 to 31%. The extent of strength reduction is found to be independent of pin size, except when the diameter is 25.4 mm. The second experimental investigation is for fact finding strength tests towards the application of PFRP dowelling as a method of connection in SLBS. This innovative building system has been engineering for the execution of a FRP house that meets the requirements for code level 6. A series of static coupon-sized tests were conducted to determine the minimum resistance of dowel connections similar to those used in the Startlink house. These results were used to verify the structural engineering design calculations. Another sub-assembly test configuration was used to determine the moment-rotation characteristics of joint details for the portal frame in the SLBS house. Four different beam-to-column joints with dowel connections, and with and without adhesively bonded connections, were statically loaded so that their rotational stiffnesses and modes of failure could be determined. The main conclusions from this study are that: -- all joints had adequate strength against the design ULS moment; -- only when the joint had adhesive bonding between the overlapping beam and column members does the rotational stiffness approach the design rigid condition; -- when clearance holes are present the rotational stiffness is low and applying adhesive bonding around the dowels cannot remove this structural limitation.

Large-scale portal horizontal band sawing machine

Abstract: The utility model relates to a sawing machine, in particular to a large-scale portal horizontal band sawing machine, which comprises a base and a saw frame, a main speed reduction control device, a transmission system and a movable workbench which are arranged on the base, wherein a portal frame is also arranged on the base; the saw frame is arranged on the portal frame; a main guide rail and a secondary guide rail which are matched with the saw frame are arranged on the portal frame; the transmission system and the main speed reduction control device are arranged on the saw frame; and a saw blade hydraulic tension device is arranged on the transmission system. According to the large-scale portal horizontal band sawing machine, the main guide rail and the secondary guide rail which are arranged on the portal frame are matched with the saw frame, so that heads, tails and even any position of large-scale forging pieces can be cut off by the band sawing machine, and the band sawing machine is high in reliability and stability of saw cutting, high in cutting accuracy and cutting efficiency and easy to operate.

Reliability analysis of steel braced reinforced concrete frames with semi-rigid connections

Abstract: This paper presents the reliability analysis of the frame structures with semi-rigid connections. For this purpose, the SEMIFEM finite element program that is capable of dealing with the semi-rigid connections is coded in FORTRAN. Then, this program is connected to the reliability algorithm. The direct coupling method, which is a combination of the reliability method and finite element method, is utilized to determine the reliability indexes and probabilities of failure for the structure. The first order reliability method (FORM) is the one favored in the present reliability analysis. Two sets of steel framed structures are analyzed; each of four and eight stories, consisting of a portal frame and three types of concentrically braced frames. Concrete compression strength limit state in reinforced concrete (RC) columns, steel strength limit state in steel braces and inter-story drift limit state are considered in reliability evaluation. According to the limit states, X braced frames are determined as the safest structures, while the portal frames are regarded as the most unsafe structures. As the connection percentage increases, the safety of the structure increases in terms of inter-story drift and steel strength limit states, but decreases for concrete compression strength limit states.

Portable portal frame

Abstract: The utility model discloses a portable portal frame. Moving rollers are located on lower portions of lower supports, upper supports are located on the upper parts of the lower supports, a gourd fixing frame is arranged on the upper parts of the upper supports, a bearing gourd is arranged in the gourd fixing frame, a forward and reverse connecting screw rod is arranged between the gourd fixing frame and the upper supports, and the upper supports and the lower supports are fixedly matched through height adjustment screws. The portal frame comprises an upper half body and a lower half body, the height of the portal frame is reduced, transportation and conveying of the portal frame are convenient, the overall height can be adjusted, and the bearing gourd frame can move leftwards and rightwards in sliding grooves through the forward and reverse connecting screw rod and can be adjusted to any positions. The sliding grooves bearing the gourd fixing frame are made of channel steel and comprise a left sliding groove and a right sliding groove, not only rigidity of the portal frame can be increased, but also the bearing capability of the portal frame is greatly strengthened, and the degree of safety is improved.

Rolling straight-line guide rail pair reliability tester

Abstract: The invention discloses a rolling straight-line guide rail pair reliability tester, which comprises a lathe bed and a horizontal moving portal frame located on the lathe bed. A rack parallel to a portal frame moving guide rail is fixedly installed at the position slightly at the back on the table surface of the lathe bed, and the length of the rack is approximately equal to that of the lathe bed. A gear shift mechanism is disposed on one side of a rear column of the portal frame, and a gear at the output shaft end of the gear shift mechanism is meshed with the rack. A loading mechanism capable of going up and down is arranged on a front column of the portal frame and used for applying load to a detected rolling straight-line guide rail pair. The gear shift mechanism and electric appliance parts in the loading mechanism are connected with a control cabinet circuit with a digital display instrument. The rolling straight-line guide rail pair reliability tester is capable of measuring the number of times of running-in of the rolling straight-line guide rail pair on the conditions of high speed and heavy load and also capable of measuring indexes of linear speed, rated dynamic load, static load, mean cycles between failures and the like, simple in structure, convenient to install, reliable in loading and accurate in testing.

Portable small-sized multipurpose portal frame

Abstract: The utility model relates to a portable small-sized multipurpose portal frame, which structurally comprises vertical rod legs, vertical rods, pin holes, a hanging ring, a pulley gear, a beam and extended insertion rods The portable small-sized multipurpose portal frame is characterized in that one vertical rod leg is mounted at the bottom of each vertical rod, one extended insertion rod is inserted into each vertical rod and fixed by one pin hole, the beam is mounted on the extended insertion rods, the pulley gear is arranged in the middle of the beam, and the hanging ring is hung in the middle of the beam through the pulley gear The portable small-sized multipurpose portal frame has the advantages that all connecting components of the portable small-sized multipurpose portal frame are detachable, so that the portable small-sized multipurpose portal frame can be detached and mounted rapidly and is small in floor area, convenient in use, simple in structure, safe, reliable and applicable to installation and transport of equipment with limited space or for outdoor operation, and the width and the height of the portable small-sized multipurpose portal frame can be adjusted in a classified manner

High-power locomotive wheel set measuring machine

Abstract: The utility model provides a high-power locomotive wheel set measuring machine which has good compatibility and high measuring precision and is simple to operate; and the high-power locomotive wheel set measuring machine comprises a portal frame, a pre-detection position wheel shifting system, a detection position wheel shifting system, a positioning system, a lifting system and an axle measuring system, wherein the portal frame is arranged on the ground, the pre-detection position wheel shifting system is fixed at the side surface of the portal frame, the detection position wheel shifting system strides over the portal frame, the positioning system and the lifting system are fixed on the side surface of the portal frame, and the axle measuring system is fixed at the top of the portal frame and can do linear motion on the portal frame. The high-power locomotive wheel set measuring machine can complete measurement of wheel diameter, difference between thickness of a brake disk and diameter of a wheel, abrasion of a brake disk, abrasion of periphery of a pedal surface, thickness of a wheel rim, QR value, width of the wheel rim, inside distance of a wheel pair, end surface runout of the wheel, radial jumping of the wheel, the axle body and other relevant measured values, wheel order difference and disk order difference simultaneously; and the high-power locomotive wheel set measuring machine is high in variety compatibility, high in accuracy, low in operation level, simple in structure, easy to maintain and high in stability.

Automatic water washing device for plate and frame filter press

Abstract: The utility model discloses an automatic water washing device for a plate and frame filter press. The device comprises a pulley rail, a pulley, a portal frame and a flushing device, wherein the portal frame is fixedly connected with the bottom of the pulley and reciprocates together with the pulley along the pulley rail; and the flushing device moves up and down along rails in two doorframes of the portal frame. Compared with the traditional automatic water washing device for the plate and frame filter press, the utility model has the advantages that: the height of the automatic water washing device can be reduced by about 1/2, so that the height of the whole device is reduced, the whole device has a neat and attractive appearance and is convenient to package and transport, heights of plants with the equipment are reduced, and the construction cost of a user is reduced.

Construction method of small-angle skew multi-span portal frame pier cast-in-situ beam for crossing highway or railway line

Abstract: The invention discloses a construction method of a small-angle skew multi-span portal frame pier cast-in-situ beam for crossing a highway or railway line. The construction method comprises a portal frame pier body construction step, a portal frame pier transverse beam construction step and a portal frame pier top cast-in-situ longitudinal beam construction step. In the three construction steps, amovable bearing protection device is used for protecting the existing line. The technology of the construction method is simple, the construction speed is fast, the construction cost is low and the manufacturing, the processing, the transportation and the protection of equipment are convenient and flexible. The movable bearing protection device belongs to equipment investment and can be reused. The construction and the protection of all portal frame pier transverse beams can be completed pore by pore when one set of movable bearing protection device is invested. Moreover, the dual functions of bearing and protection can be obtained, the equipment utilization ratio is improved, the cost is reduced and the equipment cost is saved. The movable bearing protection device is movable and is suitable for the construction of straight and curved lines, and the application scope is wide. The construction method is particularly suitable for cases that newly constructed lines intersect with existing lines at small crossing angles and in long crossing areas.

Locating device before material feeding of moulded board

Abstract: The utility model relates to a locating device before material feeding of a moulded board, which comprises a rack mechanism, a working table, two pulling plate mechanisms, a lateral thruster mechanism, a vibrating location mechanism and a plate supporting driving mechanism The rack mechanism comprises a bearing support, a portal frame and two upper longitudinal beams, the bearing support is in a frame structure, one of longitudinal driving guide rails is respectively fixed on two sides of the top of the bearing support, the portal frame is arranged on the bearing support in a transverse crossing mode, the working table is fixed on the bearing support, the two upper longitudinal beams are connected with the portal frame, each of the upper longitudinal beams is provided with at least two rotating air cylinders front and back along a longitudinal direction, tumblers are arranged on the rotating air cylinders, the transverse beam of the portal frame is provided with at least two pulling plate mechanisms and the vibrating location mechanism, and the lateral thruster mechanism is disposed on the side beam of the portal frame The locating device before material feeding of the moulded board has the advantages that the structure is reasonable, the location of channel sheets is accurate, cutting yield is improved, the universality is good, and the plates can not only be clamped, but also be driven to move forward

Equipment for build-up welding of abrasion-resistant plates

Abstract: Equipment for build-up welding of abrasion-resistant plates belongs to the technical field of welding equipment, and is used for build-up welding of planar abrasion-resistant plates The utility model adopts the technical scheme that the equipment comprises a portal frame, a working platform, a transmission mechanism and a build-up welding machine, wherein the build-up welding machine is mounted on a cross beam guide rail of the portal frame; the working platform is arranged under the portal frame; the lower bottom surface of the working platform is mounted on a working platform guide rail; the transmission mechanism comprises a motor, a reducer, a gear and a gear rack; the gear rack is fixed on the lower bottom surface of the working platform; the motor and the reducer are connected with a gear shaft in sequence; and the gear is meshed with the gear rack According to the utility model, the build-up welding machine moves left and right along the cross beam guide rail of the portal frame, and the transmission mechanism drives the working platform to move forwards and backwards, so as to realize omnidirectional build-up welding of the abrasion-resistant plates; and a circulation cooling device can take heat quantity generated during the build-up welding process away, so as to reduce the deformation of the abrasion-resistant plates as well as the environment pollution The equipment has the advantages that the build-up welding precision is high; workpieces can be loaded and unloaded conveniently and fast; the equipment structure is simple; and the maintenance is easy

Full-automatic thickness tester for geo-technical synthetic material

Abstract: The invention relates to a full-automatic thickness tester for geo-technical synthetic materials, comprising a base, a portal frame, a movable beam, a test part and a control box, wherein the portal frame is fixedly connected with the base; the base is provided with a portal frame bottom plate; the test part comprises a pressure test unit, a thickness test unit and a test platform; the pressure test unit is fixedly connected with the movable beam of the portal frame; the thickness test unit is fixed on the base; and the test platform is fixedly connected with the portal frame bottom plate. The thickness tester in the invention has the advantages of automatic testing process, automatically printing logarithmic curves of a counting report and thickness change, time saving and force saving, simple operation and high working efficiency.

Double-purpose polishing machine

Abstract: The utility model relates to a double-purpose polishing machine which comprises a machine frame and is characterized in that a mainframe box with a chuck is arranged at one end of the machine frame; a lifting support device, a tail seat and a portal frame are arranged on the machine frame; the machine frame is provided with a rack; a gear meshed with the rack is arranged at the lower part of the portal frame; the portal frame is movably arranged on the machine frame along the rack and is provided with a polishing head; the polishing head is provided with a polishing abrasive belt and a polishing abrasive cloth wheel whose stations are the same; the lifting support device comprises a lifting body and two support rollers arranged at the upper part of the lifting body; and a dust remover which is connected with the portal frame and moves synchronously with the portal frame is arranged at one side of the portal frame. The double-purpose polishing machine has the advantages of stable operation, good polishing effect, high efficiency and high degree of automation, and the environmental pollution is effectively reduced.

Novel plane milling and boring profile shaping machine

Abstract: A novel plane milling and boring profile shaping machine comprises a power system, a body, a worktable, a portal frame and a control system. The portal frame comprises a beam, and an installation box for laying lines of the control system is arranged inside the beam. The lines of elements are not exposed, safety standards are improved, failure rate is decreased, a lighting device is arranged at the bottom of the beam to facilitate nighttime operation, and operating precision and repeated positioning precision are improved.

Integral hydraulic steel formwork jumbo

Abstract: The invention discloses an integral hydraulic steel formwork jumbo, which relates to the technical field of concrete formwork assembling, particularly relates to a self-propelled integral hydraulic steel formwork jumbo The integral hydraulic steel formwork jumbo disclosed by the invention is characterized in that the jumbo is composed of a steel portal frame, a typified formwork, travelling steel wheels, a steel rail, a sleeper, a motor unit, a hand-drive block and a hydraulic jack, wherein the typified formwork is arranged on the steel portal frame, the two ends of the lower part of the steel portal frame are respectively provided with a travelling steel wheel, the steel rail is paved corresponding to the travelling steel wheels, the steel rail is arranged on the sleeper, the motor unit drives the jumbo to travel along the steel rail through driving the travelling steel wheels, the hand-drive block is arranged on a beam of the steel portal frame and used for hanging the typified formwork, and the hydraulic jack is arranged on stand columns on both sides of the steel portal frame The integral hydraulic formwork jumbo disclosed by the invention has the advantages of low cost, reliable structure, convenience in operation, rapidness in installation and disassembly, and good concrete forming, and the like; and by using the integral hydraulic formwork jumbo, the construction speed can be accelerated effectively, and the interference to other construction operations can be reduced

Large-tonnage elevator stereo car frame

Abstract: The utility model relates to a large-tonnage elevator stereo car frame which is characterized in that the stereo car frame includes a main portal frame, two auxiliary portal frames, a bridge bottom supporting device, upper crossbeams, upper crossbeam diagonal braces, main pull bars, upper pull bars, and front pull bars The two auxiliary portal frames are arranged on the two sides of the main portal frame The main portal frame and the auxiliary portal frame which are adjacent to each other are connected via the upper crossbeams and the main pull bars The auxiliary portal frames are connected with the bridge bottom supporting device via the front pull bars The large-tonnage elevator stereo car frame greatly increases the carrying capacity of the car frame, effectively improves the force condition of a bridge bottom, greatly improves the safety under the emergency and the rigidity of the car frame, and effectively disperses the big torsional force generated by the offset load The large-tonnage elevator stereo car frame facilitates the installation and adjustment of the car frame and guarantees the rigidity of a car frame system through adopting a multi-pull bar system

Mineshaft material hoisting frame

Abstract: The utility model relates to a mineshaft material hoisting frame. The mineshaft material hoisting frame comprises a portal frame body, a material box, a platform and a hoisting electric block, wherein the portal frame body consists of an upright post, a portal bracket beam and a bracket; the material box consists of a box body, a steel wire rope, a hoisting ring and a rope clip; the platform consists of a bracket beam, a secondary beam, a boundary beam and a platform bracket; the hoisting electric block is arranged on a transverse beam of the portal frame body; and the hoisting electric block is connected with the steel wire rope of the material box through a hook. The mineshaft material hoisting frame has the beneficial effects of reducing the procedure of hoisting templates through a tower crane and saving the time of turning over materials. The material platform is not provided, so the materials are convenient and flexible to turn over. The portal frame body and the platform are fixed in reserved holes of the wall of the mineshaft through the brackets, so the installation operation is reduced. The electric block type power hoisting mode is adopted, so the mineshaft material hoisting frame is quick in operation and convenience of vertical and horizontal operation is provided. A protective platform is arranged at the bottom, so the safety is improved. The requirement of the construction process of supporting one plate with three brackets in the conventional top plate is met.

Nonlinear dynamics of a flexible portal frame under support excitation

Abstract: This paper presents a nonlinear dynamic analysis of a flexible portal frame subjected to support excitation, which is provided by an electro-dynamical shaker. The problem is reduced to a mathematical model of four degrees of freedom and the equations of motion are derived via Lagrangian formulation. The main goal of this study is to investigate the dynamic interactions between a flexible portal frame and a non-ideal support excitation. The numerical analysis shows a complex behavior of the system, which can be observed by phase spaces, Poincaŕ sections and bifurcation diagrams..

Device capable of integrally elevating ultrahigh large-span heavy-duty steel vestibule

Abstract: The utility model discloses a device capable of integrally elevating an ultrahigh large-span heavy-duty steel vestibule. The device consists of a portal frame, a plurality of hoisting machines, a pulley block and a steel cable rope, wherein the portal frame is arranged on the upper part of a support frame; and the pulley block is arranged on the portal frame. The device has a simple structure, and can be used for safely and reliably elevating the large-span heavy-duty steel vestibule integrally and greatly reducing high-altitude workload. Compared with large-sized hoisting machinery, the device has the advantages of high economic efficiency, low energy consumption, low carbon, environmental friendliness and good use and popularization values.