12 results about "Arch height" patented technology

The present invention relates to a posterior chamber phakic IOL (1) having an inherent arch height (89A) independent of its external diameter (81), and a method for manufacturing such an IOL (1).

This invention provides a method for calculating the collapse depth of the surrounding rock of a top arch. Step S1: Obtain the arch height *a*, tunnel radius *b*, and the boundary angle θ1 of the equivalent four-centered circular arc. Step S2: Based on the data obtained in Step S1, construct an elliptical collapse arch using the four-centered method. Step S3: Perform a force balance analysis on the self-stabilizing surrounding rock in the vertical direction to obtain the equilibrium equation. Step S4: Analyze the equilibrium equation to obtain a transcendental equation containing only one unknown: the angle θ between the direction of the frictional force of the self-stabilizing surrounding rock and the vertical direction. h Step S5: Solve the equilibrium equations using numerical analysis to obtain the collapse depth. This method can accurately predict the collapse depth of the surrounding rock cavity in the tunnel arch and determine the supporting force of the surrounding rock, providing a reasonable dynamic design basis for tunnel construction across fault fracture zones.

The embodiment of the utility model discloses a device and a system for testing the curvature radius of curved glass. The device comprises a test board, an arch height measuring assembly and a moving assembly, a middle area for placing curved glass is arranged at the center of the test board; the arch height measuring assembly is arranged above the middle area and is used for measuring the distance from the central vertex position of the curved glass to the arch height measuring assembly; the moving assemblies are arranged on the periphery of the middle area and located in the first direction and the second direction, the first direction is the chord length direction of the curved glass, and the second direction is perpendicular to the chord length direction of the curved glass; the moving assembly is in sliding connection with the test board and used for abutting against and pushing the curved glass so that the center of the curved glass can coincide with the center of the test board. The curvature radius testing device of the curved glass has the advantages of being simple in testing operation, high in testing efficiency and small in testing error.

The application provides a calculation method of a crown arch surrounding rock collapse depth considering excavation unloading stress redistribution, comprising the following steps: step S1: a triangular formula is used to calculate the collapse arch height before excavation; step S2: a tunnel radius, surrounding rock bulk density, cohesive force and internal friction angle are collected; step S3: stress decomposition and stress redistribution analysis are carried out after excavation, and the crown arch surrounding rock collapse depth is obtained. The crown arch surrounding rock collapse cavity depth of the tunnel can be more accurately predicted, the surrounding rock support force is determined, and a reasonable dynamic design basis is provided for the tunnel construction through a fault fracture zone.

The invention discloses an adaptive adjustment temporary supporting structure of a variable cross-section water delivery tunnel and a construction method of the adaptive adjustment temporary supporting structure. Comprising a temporary support, columns on two sides of the temporary support are connected with an upper fixed beam and a lower fixed beam through hinged supports and provided with an upper movable beam and a lower movable beam which can slide, and the end of the upper fixed beam can be driven to ascend and descend by adjusting the length of a pull rod connected between the upper movable beam and the lower movable beam. The arched support is formed by hinging a first support and a second support to an upper fixed beam and is connected with the first support and the second support through an inhaul cable. During construction, the supporting frame and the arch-shaped support are installed firstly, then the outline of the arch-shaped support is matched with the tunnel section by adjusting the inhaul cables, and finally the supporting height fine adjustment and close attachment are achieved by adjusting the pull rods. Through the synergistic effect of the openable arch support and the adjustable lever mechanism, flexible and accurate adaptation of the arch height and the contour of the variable cross-section tunnel is achieved, and the structure is stable.

The invention discloses a platinum cooling flat tube structure and a manufacturing method thereof, and aims to solve the technical problem of insufficient high-temperature collapse resistance in the prior art. The cooling flat pipe structure is of a continuous curved surface structure with an arch-shaped upper supporting part and an arch-shaped lower supporting part, and an optimized prestress distribution and bending moment self-balancing system is formed by a pipe body by controlling the mathematical relation between the arch height h and the width L and the ratio of the curvature radius R of the arch face of the upper supporting part to the curvature radius r of the arch face of the lower supporting part. According to the structure, gravity loads at high temperature can be effectively converted into pressure stress along the arch face, the creep resistance and the structural stability are remarkably improved, and therefore the technical problem that a traditional plane structure is prone to collapse and deformation under the working condition of the high temperature of 1200 DEG C is solved.

This utility model discloses a corner support device for the arched formwork of the secondary lining of a mined tunnel, comprising: an upper support component including a U-shaped top support with a screw rod below it and an adjustable support rod rotatably mounted on the screw rod; a lower support component including a diagonal support rod, which is tubular, with its upper end set as a horizontal plane and its lower end set as a slope; and a vertical connecting fastener with a vertical rod inside. The adjustable support rod of this utility model is rotatably mounted on the screw rod through its internal threaded connecting part, achieving precise adjustment of the support height, adapting to the construction needs of different arch heights, and reducing the risk and difficulty of repeated high-altitude adjustments.

The application discloses a kind of combined beam cable-stayed bridge girder tensile stress reduction control construction methods, comprising the following steps: S1, the pre-arch height theoretical value of each section steel beam is calculated, and each section steel beam reaches corresponding pre-arch height before assembly;S2, each section steel beam is pushed to design position using push method, and steel girder installation is completed;Each section steel beam is supported by temporary buttress;S3, from small mileage to large mileage direction, deck is installed in block;S4, the concrete is poured at the wet joint between adjacent two deck panels;S5, deck prestressed construction: tensioning the prestressed steel strand in each deck panel, completing girder construction;S6, each cable is installed, and each cable on both sides of bridge is sequentially symmetrically tensioned from far tower end to near tower end.The application can effectively reduce the tensile stress of girder concrete, and guarantee the durability of bridge structure.

The invention relates to a preforming method suitable for a large-arch-height complex-configuration cap-shaped stringer, preforming equipment can be designed in a segmented mode, an equal-straight-section forming unit and a curvature-section forming unit are arranged, and the curvature-section forming unit is designed to be a device with a segmented independent lifting rack. The forming method comprises the steps that in the preforming process of a flat prepreg sheet, the height of a curvature section can be adjusted in a segmented mode to be increased to the same horizontal plane, the curvature section gradually falls down after heating, and the flat prepreg sheet is always supported by a forming mold in the shape follow-up process of the flat prepreg sheet; and then preforming is carried out after the flat prepreg sheet is attached to the forming mold, so that the quality problems of wrinkles and the like of the cap-shaped stringer part with the large arch height and the complex structure are effectively avoided.

This invention discloses a rapid installation method for a large-span, double-limb combined tensioned beam structure, belonging to the field of steel structure installation and construction technology. The invention involves processing the tensioned beam as a whole in the workshop and then segmenting it at 1 / 3 and 2 / 3 of its length before transporting it to the construction site. One of the steel columns is cut into a column head and a column body below the column top. The column head and the tensioned beam's ear plate unit are then assembled on the ground using pins. The beam is assembled into a whole according to the designed arch height, and an infrared monitoring system is used to control the assembly accuracy in real time. Temporary fixing measures, such as positioning baffles, are set at the joint between the column head and the column body. After the tensioned beam is hoisted into place, the pins are connected, and then the column head and column body are welded together. This invention, through ground assembly, precise infrared monitoring, temporary positioning, and delayed ear plate welding, effectively eliminates hoisting deformation and installation deviations, increases the first-pass perforation rate of the pins, avoids the risk of enlarged holes, and significantly improves installation efficiency and structural safety.

The invention relates to the field of rupture disk testing, and discloses an arch height measuring device for a rupture disk in a hydrogen environment, the arch height measuring device comprises a measuring unit and an action unit, the measuring unit comprises an infrared distance meter and a measuring rod, and the action unit comprises a high-pressure side sealing end cover, a low-pressure side sealing end cover and a compression positioning ring. During measurement, an external high-pressure hydrogen source conveys high-pressure hydrogen into the high-pressure cavity, under driving of the ultrahigh-pressure hydrogen, the to-be-measured hydrogen rupture disk generates dynamic deformation from the middle position, the measuring rod abutting against the to-be-measured hydrogen rupture disk is driven to slide relative to the low-pressure side sealing end cover, and the infrared distance meter can monitor displacement of the measuring rod. Therefore, the arch height change of the rupture disk in the blasting process in the hydrogen environment can be monitored in real time. The hydrogen rupture disk to be measured transmits deformation information by using the measuring rod, so that accurate acquisition of parameters of the rupture disk from deformation to blasting in a hydrogen high-pressure environment is realized, and a powerful guarantee is provided for promoting long-acting development of a safety relief device of a hydrogen storage cylinder.

A method for bending and manufacturing large-diameter, thick-walled, high-strength steel pipes includes: simulating the bending direction centerline of each semicircle using a BIM model of the steel arch shape; marking the joint lines and processing lines of the steel pipe with chalk and stamping them on the pipe with a steel stamp; applying pressure using a press and comparing the theoretical and measured arch heights of various parts of the steel pipe; re-verifying the joint lines, processing lines, and their corresponding centerlines; marking the cutting sequence on the steel pipe and cutting the pipe according to the specified sequence, leaving approximately 10mm of uncut area in the connection zone of the relevant cuts; cutting the subsequent eight connection points after the component has cooled; and cutting the pipe at both ends to divide it into two semicircular sections. This invention solves the difficulty of processing adjacent stages of large-diameter curved steel pipes in different planes.