Abstract

A normalized method for characterizing the homogeneity of lightweight aggregate concrete, the method comprising: preparing a lightweight aggregate concrete specimen (S1); cutting the lightweight aggregate concrete specimen along a height direction and through a central axis in the height direction, so as to obtain n cut sections ai (S2); photographing each cut section ai and performing image recognition, obtaining a total area A and a lightweight aggregate phase area Ai of each cut section ai, and calculating a lightweight aggregate phase area ratio bi = Ai/A (S3); and on the basis of the differences |bi-bj| between the lightweight aggregate phase area ratios bi of the respective cut sections in a same lightweight aggregate concrete specimen, determining the homogeneity of the lightweight aggregate concrete (S4). A normalized approach for calculating the homogeneity of lightweight aggregate concrete is used to take into account complete section information of lightweight aggregate concrete specimens and the impact of differences in lightweight aggregate usage on the homogeneity of different lightweight aggregate concretes, thereby achieving rapid and accurate determination of the homogeneity level of aggregate distribution in the lightweight aggregate concrete.

IPC Classes  ?

• G01N 21/84 - Systems specially adapted for particular applications
• G01N 1/06 - Devices for withdrawing samples in the solid state, e.g. by cutting providing a thin slice, e.g. microtome
• G01N 1/28 - Preparing specimens for investigation
• G06T 7/62 - Analysis of geometric attributes of area, perimeter, diameter or volume

Abstract

The present disclosure provides a heat conduction device, and a foundation structure and a construction method therefor. The foundation structure comprises a foundation at least partially buried below the ground and one or more heat conduction devices; the foundation comprises a prefabricated concrete foundation and a supporting structure; the concrete foundation is arranged on a thermal insulating layer; the supporting structure is arranged above the concrete foundation and connected to the concrete foundation; the heat conduction device comprises a heat dissipation unit and a heat collection unit; the heat dissipation unit is arranged above the ground; the heat collection unit is buried below the ground; the heat collection unit is in thermal communication with the heat dissipation unit; by means of the heat dissipation unit, the heat collection unit transmits to an overground environment heat of an underground area where the foundation is located. According to the foundation structure, the exposure time of the foundation pit can be effectively shortened, the heat dissipation capacity of the foundation is reduced, and the refreezing rate of the foundation is increased, thereby improving the loading capacity and stability of an enlarged foundation.

IPC Classes  ?

• E02D 3/10 - Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

Abstract

A design method and system for an anisotropic friction pendulum seismic reduction and isolation support. The method comprises: according to a support transverse equivalent curvature radius and a spherical sliding plate curvature radius, determining a support transverse curvature radius; according to the support transverse curvature radius and a support longitudinal equivalent curvature radius, determining a support longitudinal curvature radius; according to a support transverse sliding displacement, the support transverse curvature radius and the spherical sliding plate curvature radius, determining a support transverse sliding space; and according to a support longitudinal sliding displacement, the support transverse sliding displacement, the spherical sliding plate curvature radius and the support longitudinal curvature radius, determining a support longitudinal sliding space. Separately designing the longitudinal and transverse curvature radiuses and sliding displacements of the support achieves different seismic isolation rigidity and sliding displacements of bridges in the longitudinal and transverse directions, thus satisfying the requirements for anisotropic seismic reduction and isolation performance of bridges.

IPC Classes  ?

• G06F 30/13 - Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
• G06F 119/14 - Force analysis or force optimisation, e.g. static or dynamic forces
• E01D 19/04 - BearingsHinges
• E04B 1/36 - Bearings or like supports allowing movement

Abstract

Provided in the present disclosure is a prefabricated orthotropic steel bridge deck structure combining U-shaped longitudinal ribs and L-shaped longitudinal ribs, said prefabricated orthotropic steel bridge deck structure comprising a steel top plate, U-shaped longitudinal ribs, L-shaped longitudinal ribs, diaphragm plates and inverted-T-shaped crossing ribs. The steel top plate serves as a top plate of the orthotropic steel bridge deck structure; on traffic lane and heavy vehicle lane areas of a bridge floor, the bottom surface of the steel top plate is fixedly connected to upper flanges of the U-shaped longitudinal ribs; and on an overtaking lane and emergency parking strip areas of the bridge floor, the bottom surface of the steel top plate is fixedly connected to top surfaces of the L-shaped longitudinal ribs. Upper portions of the diaphragm plates and the inverted-T-shaped crossing ribs are each provided with a plurality of boot-shaped holes; top faces of the diaphragm plates and the inverted-T-shaped crossing ribs are both fixedly connected to the bottom surface of the steel top plate; and the U-shaped longitudinal ribs and the L-shaped longitudinal ribs both penetrate through the plurality of boot-shaped holes of the diaphragm plates and the inverted-T-shaped crossing ribs. The present disclosure can effectively improve the rigidity matching and deformation coordinative capacities of orthotropic steel bridge decks, prevent stress concentration, and ensure the anti-fatigue capacities and the anti-fatigue requirements in different areas of the bridge deck structure to be more coordinative, thereby effectively solving the fatigue problem of traditional orthotropic steel bridge decks.

IPC Classes  ?

• E01D 19/02 - PiersAbutments
• E01D 2/00 - Bridges characterised by the cross-section of their bearing spanning structure
• E01D 101/30 - Metal

Abstract

The present disclosure relates to an intelligent control method for positioning and settling of a deepwater prefabricated foundation of a large bridge. The upper portion of a prefabricated foundation is located above a water surface, and the lower portion of the prefabricated foundation is located below the water surface; I positioning devices are mounted at the top surface of the prefabricated foundation, J positioning ships are arranged around the prefabricated foundation, I is a natural number greater than or equal to 3, and J is a natural number greater than or equal to 4; the positioning ships are connected to the prefabricated foundation by means of mooring hawsers. The method comprises: by using an equation of motion of the settling process of a prefabricated foundation under the coupling effect of wind, waves, and currents, an intelligent regulation and control center performs intelligent control on the motion posture of the prefabricated foundation by means of mooring hawsers. According to the present disclosure, by using an equation of motion of the settling process of a prefabricated foundation under the coupling effect of wind, waves, and currents, and the intelligent regulation and control center performs intelligent control on the motion posture of the prefabricated foundation by means of mooring hawsers, thereby greatly improving the precision, robustness, efficiency, and safety of positioning and settling of deepwater prefabricated foundations.

IPC Classes  ?

• E02D 27/52 - Submerged foundations

Abstract

Provided in the present disclosure is an easily-reset suspension bridge friction-type central buckle capable of being controlled in stages. The suspension bridge friction-type central buckle comprises a friction device and a bracing cable. The friction device has one end connected to a main beam and the other end connected to one end of the bracing cable, and the other end of the bracing cable is connected to a main cable pin shaft. The bracing cable deforms under the action of an external force to generate an internal force. When the internal force of the bracing cable exceeds an internal static friction force of the friction device, the friction device deforms to release the internal force of the bracing cable. The central buckle provided in the present disclosure is easy to reset, can be controlled in stages, is suitable for a cantilever bridge, and can meet the use requirements of a suspension bridge under different working conditions such as in a normal operating state or being acted upon by an extreme load.

IPC Classes  ?

• E01D 11/02 - Suspension bridges
• E01D 19/00 - Details of bridges
• F16F 7/08 - Vibration-dampersShock-absorbers with friction surfaces rectilinearly movable along each other

Abstract

Disclosed is an intelligent monitoring-type bridge friction damper, which comprises a bridge friction damper body and an intelligent monitoring system. The bridge friction damper body comprises a sliding plate, a friction plate, a first connecting seat and a second connecting seat. The intelligent monitoring system comprises a data acquisition module and a visual analysis module. In the present invention, a friction material having a low linear abrasion rate is employed and a stainless steel plate is arranged on the surface of a steel plate ground by the friction material, so that the abrasion of the friction material during the service of the friction damper is minimized, thereby satisfying a long-distance abrasion requirement of the friction damper. Moreover, two extreme positions of the first connecting seat and the second connecting seat within a rotating range can achieve conversion of the friction damper under different usage requirements, thereby effectively improving practicability.

IPC Classes  ?

• E01D 19/00 - Details of bridges
• G01D 21/02 - Measuring two or more variables by means not covered by a single other subclass
• F16F 9/19 - Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder
• E04B 1/98 - Protection against other undesired influences or dangers against vibrations or shocksProtection against other undesired influences or dangers against mechanical destruction, e.g. by air-raids

Abstract

A rebar spacing measurement method and system based on binocular vision. The method comprises: acquiring a plurality of images of bound rebars at different angles, and extracting edge lines from each image; according to the edge lines in each image, obtaining intersection points of the rebars in each image; performing three-dimensional reconstruction according to the intersection points of the rebars in each image, so as to obtain three-dimensional coordinates of the intersection points of the rebars; and traversing the three-dimensional coordinates of the intersection points of the rebars, so as to obtain the spacing between the rebars. The rebar spacing measurement method and system based on binocular vision solve the problem of it not being possible for image technology to distinguish intersection points of bound rebars on different spatial planes, and thus needing to place a calibration object on the surface of a rebar to be tested. The technique is easily used; high precision, a high speed and strong applicability are achieved; the measurement efficiency and accuracy of bound rebars are improved; the labor intensity of workers is reduced; and the phenomena of a heavy workload, low efficiency and being prone to false measurements and missing measurements that are caused by performing manual measurements using a steel ruler are effectively mitigated.

IPC Classes  ?

• G01B 11/14 - Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures

Abstract

Disclosed in the present invention are a rotary friction coefficient measurement method and system based on annular loading. The method comprises: measuring and determining a position to be tested and measured, drilling a hole by means of a rotary drilling rig to a designed elevation or a bedrock position to be measured, and cleaning the hole to ensure that no sludge is present at the bottom of the hole; mounting an annular loading module at the bottom of the rotary drilling rig, and lowering a rotary drilling bit to sink the annular loading module to the surface of said bedrock position; applying vertical pressures to the annular loading module in a graded mode by means of a vertical pressurizing module, measuring values of the applied vertical pressures by means of a vertical pressure measurement module, and measuring a settlement value of a rotary drilling rod by means of a rotary drilling rod settlement amount measurement module; applying torque loads to the annular loading module in a graded mode, and monitoring and obtaining torque values by means of a torque load measurement module; repeatedly carrying out single-point annular loading module torsional friction coefficient measurement tests multiple times under different vertical pressures, and substituting into a rock mass friction coefficient calculation formula for a rock mass bearing stratum to obtain a rock mass friction coefficient value of a rock mass bearing stratum to be measured. The test cost is low, and the safety is high.

IPC Classes  ?

• G01N 19/02 - Measuring coefficient of friction between materials
• E02D 33/00 - Testing foundations or foundation structures

Abstract

A fabricated bent cap and pier column combined structure and a construction method therefor. The fabricated bent cap and pier column combined structure comprises a prefabricated bent cap (10) and a prefabricated pier column (20); the prefabricated bent cap (10) is an ultra-high-performance concrete hollow shell, comprising a top plate (11), a web (12), a bottom plate (13), and a bent cap protruding joint (14); a plurality of transverse partition plates (15) are provided in a cavity defined by the top plate (11), the web (12), and the bottom plate (13) so as to partition the cavity into a plurality of chambers; concrete inner cores (16) are provided in the chambers located in the middle of the ultra-high performance concrete hollow shell; a top steel plate (17) is provided at the top of the ultra-high performance concrete hollow shell; the bent cap protruding joint (14) is disposed in the middle of the bottom plate of the ultra-high performance concrete hollow shell; a recess is formed in the top of the prefabricated pier column (20); the bent cap protruding joint (14) is inserted into the recess; the bent cap protruding joint (14) is fixedly connected to the recess in the top of the prefabricated pier column (20) by means of wet joints. Therefore, the problem of traffic congestion caused by the need to close traffic during construction of large cantilever bent caps in big cities is solved.

IPC Classes  ?

• E01D 19/00 - Details of bridges
• E01D 21/00 - Methods or apparatus specially adapted for erecting or assembling bridges
• E01D 19/02 - PiersAbutments
• E01D 101/28 - Concrete reinforced prestressed

Abstract

Disclosed in the present invention is a cable strand unmanned follow-up traction intelligent recognition system based on machine vision, comprising: a data acquisition module, configured to acquire a front view image and a rear view image of a pull device and position information of the pull device; a data wireless transmission module, configured to transmit data of the data acquisition module; an edge computing terminal, configured to receive the front view image and the rear view image of the pull device and the position information of the pull device, wherein the edge computing terminal further comprises a cable strand attitude anomaly recognition module and an anomaly state early warning module, and the cable strand attitude anomaly recognition module is configured to recognize a cable strand anomaly state and give an alarm by means of the anomaly state early warning module; and a receiving end, configured to receive anomaly alarm information sent by the anomaly state early warning module. Further disclosed in the present invention is a cable strand unmanned follow-up traction intelligent recognition method based on machine vision. The present invention improves the intelligent level of on-site cable strand erection, saves manpower, improves the traction efficiency, has strong operability, and is suitable for engineering sites.

IPC Classes  ?

• G06T 7/00 - Image analysis
• G06K 9/62 - Methods or arrangements for recognition using electronic means

Abstract

The present invention relates to the technical field of segmental beam prefabrication methods, and particularly relates to a segmental beam prefabrication method. The method is performed according to the following steps: S1, casting a segmental beam at a prefabrication station, building male spline teeth on a male-spline-tooth side of the segmental beam, and building a planar surface on a female-spline-tooth side of the segmental beam; S2, after the prefabrication of the segmental beam is completed, transferring the segmental beam to a steam-curing station to perform curing; S3, arranging a carving robot at the end of the steam-curing station that corresponds to female spline teeth of the segmental beam; and S4, milling the planar surface at one end of the female spline teeth of the segmental beam by using the carving robot, so as to build the female spline teeth, thus completing the prefabrication of the segmental beam. The segmental beam prefabrication method of the present invention is simple, has extremely high machining efficiency for female spline teeth, has an extremely wide range of applications, can be applied to the prefabrication operation of various segmental beams having different specifications, and has great generalization value.

IPC Classes  ?

• B28B 15/00 - General arrangement or layout of plant
• B28B 7/00 - MouldsCoresMandrels
• B28B 11/24 - Apparatus or processes for treating or working the shaped articles for curing, setting or hardening
• B28B 11/08 - Apparatus or processes for treating or working the shaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads

Abstract

The present disclosure relates to the technical field of concrete, and provides 200 MPa-grade steam-curing-free ultra-high performance concrete containing coarse aggregate, and a preparation method therefor. The ultra-high performance concrete comprises the following raw materials, in parts by mass: 100 parts of cement, 15-20 parts of silica fume, 30-35 parts of fly ash, 95-105 parts of fine aggregate, 85-140 parts of coarse aggregate, 20-25 parts of water, 2-5 parts of a water reducing agent and 19-33 parts of steel fibers. The components of the ultra-high performance concrete provided in the present disclosure mainly comprise conventional materials and waste materials; there are few raw materials; and the materials are easy to obtain and low cost. According to the preparation method for the ultra-high performance concrete provided in the present disclosure, the ultra-high performance concrete is subjected to forming maintenance by using a solar accelerated maintenance method; the concrete can be ensured to be produced in an economic, efficient and high-quality manner under non-constant-temperature maintenance conditions such as solar energy on the basis of concrete performance prediction of an equivalent age; and the maintenance process is energy-saving, environmentally friendly, green and low-carbon, and has simple and convenient operation and low economic cost, which facilitating the popularization and application of the ultra-high performance concrete.

IPC Classes  ?

• C04B 28/04 - Portland cements

Abstract

A method for rapidly optimizing the mix proportion of precast concrete components, comprising: determining a concrete 28d design strength and a concrete design strength at the conclusion of a rapid precast curing process which a precast concrete component must achieve; pre-determining a mix proportion of concrete, and preparing two groups of concrete specimens according to the mix proportion; curing the concrete specimens by means of an actual rapid precast curing method and a constant-temperature rapid curing means, measuring the strengths of the concrete specimens by means of a standard testing method after curing, and comparing the measured strengths with the required design strength, until the requirement is met. The present method may significantly reduce the number of trial mix attempts required to determine a concrete mix proportion, thereby speeding up the production progress of precast components, shortening the test mix cycle for the concrete, and reducing the reliance on engineering experience when adjusting the concrete mix proportion.

IPC Classes  ?

• B28B 11/24 - Apparatus or processes for treating or working the shaped articles for curing, setting or hardening
• C04B 40/02 - Selection of the hardening environment
• B28B 7/14 - Moulds with means incorporated therein, or carried thereby, for cutting the moulded article into parts
• G01N 33/38 - ConcreteLimeMortarGypsumBricksCeramicsGlass

Abstract

A friction energy dissipation type wind-resistant support, and a method. The support comprises a planar friction pair and a rotating friction pair, and further comprises a rotating shaft (5), a middle lining plate (6), a guide shaft (9), a first elastic body (10), a friction damper spring assembly (13) and a bottom basin assembly (14), an inner concave hole being provided in the center of a convex spherical surface of a spherical crown; the rotating shaft (5) is arranged in the center of the middle lining plate (6), and the rotating shaft (5) is inserted into the inner concave hole, so that the rotating shaft (5) may adapt to rotation of the support in a horizontal plane; the middle lining plate (6) is arranged on the bottom basin assembly (14), the guide shaft (9) is also arranged on the bottom basin assembly (14); the first elastic body (10) is sleeved on the guide shaft (9), and buffering and restoring force is provided for the movement of a main girder across a bridge by means of the first elastic body (10), which has an energy absorption effect; and the friction damper spring assembly (13) is horizontally arranged in the bottom basin assembly (14) and is perpendicular to the arrangement direction of the guide shaft (9). The function of sliding friction energy dissipation is achieved by applying a pre-tightening force to the friction damper spring assembly (13). The wind-resistant support solves the problems of an impact force on the main girder being large, and the spherical crown of the support easily falling off, under the action of transverse wind on the bridge.

IPC Classes  ?

• E01D 19/04 - BearingsHinges
• E01D 19/00 - Details of bridges
• E04H 9/02 - Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground

Abstract

Disclosed in the present invention are an intelligent measurement and control system for the short-line matching prefabrication of a segmental girder, and a use method thereof. The intelligent measurement and control system for the short-line matching prefabrication of a segmental girder comprises an automatic measurement sub-system, a bottom die trolley intelligent location adjustment sub-system, a side die automatic combination sub-system and an inner die automatic combination sub-system. When the intelligent measurement and control system for the short-line matching prefabrication of a segmental girder is used, the centroid coordinates of the current matched girder segment are calculated according to measurement point data that is measured by the automatic measurement sub-system in real time, and same are compared with expected centroid coordinates; and an error and an error change rate are fed back to the bottom die trolley intelligent location adjustment sub-system in order to adjust the spatial attitude of a matched girder segment in real time, such that the intelligent adjustment of a bottom die trolley is realized, thereby significantly improving the location adjustment precision and efficiency of a bottom die. In addition, barriers of data interconnection between systems are broken through in conjunction with the side die combination sub-system and the inner die combination sub-system, such that intelligent operations during the whole process of "measurement-location adjustment-combination-remeasurement" of a prefabricated template of a segmental girder are realized, thereby significantly improving the industrial construction level of segmental girder prefabrication.

IPC Classes  ?

• B28B 15/00 - General arrangement or layout of plant
• B28B 17/00 - Details of, or accessories for, apparatus for shaping the materialAuxiliary measures taken in connection with such shaping

Abstract

Disclosed in the present invention is a forming process for an ultra-large-diameter annular reinforcing mesh component, the forming process comprising the following steps: S1, preparing a planar reinforcing mesh; S2, bending and forming the planar reinforcing mesh to form a semi-circular reinforcing mesh, and abutting and fixing two arc reinforcing meshes to form an annular mesh; and S3, abutting and fixing a plurality of annular meshes to form an annular component. In the present invention, planar reinforcing meshes are mechanically produced, then, the meshes are bent into arcs by using a special arc-bending apparatus, and finally, the meshes are joined into rings and provided with drag hook ribs in an insertion manner to finally form a component, such that the manpower input for steel bar binding can be reduced, the steel bar binding quality is improved, and the bridge tower construction efficiency is improved.

IPC Classes  ?

• B21F 27/12 - Making special types or portions of network by methods or means specially adapted therefor
• B21F 27/10 - Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
• B21F 1/00 - Bending wire other than coilingStraightening wire