525 results about "Concrete beams" patented technology

The invention provides a reinforcing beam reinforced by adopting an out-of-service wind power blade and a method for determining the bending rigidity. According to the reinforcing beam, a plurality of grooves are formed in at least one surface of a reinforced concrete beam; the reinforcing layer comprises reinforcing ribs and a cement-based composite matrix, a plurality of protrusions are arranged on the surface of the cement-based composite matrix, the protrusions are arranged at intervals in the length direction of the cement-based composite matrix, and the protrusions are correspondingly embedded into the grooves, so that the reinforcing layer is connected with the reinforced concrete beam to obtain a reinforced concrete reinforced beam; wherein the reinforcing ribs are obtained by disassembling and cutting a main beam of the retired wind power blade. According to the reinforcing beam, the combining capacity of the reinforced concrete beam and the reinforcing layer is high, mutual slippage is avoided, the retired wind power blade composite material resources are utilized, the environment is protected, and the cost is saved while high-performance reinforcing treatment can be conducted on the damaged reinforced concrete beam structure or the reinforced concrete beam structure with insufficient bearing capacity.

The invention relates to the technical field of beam bridge splicing, in particular to a large-span concrete continuous beam bridge splicing construction method based on intelligent construction. The method comprises the following steps: acquiring digital modeling data of a left bridge and a right bridge to be spliced; analyzing the digital modeling data, and determining the dynamic stress distribution of the whole construction process; acquiring deformation monitoring data in real time, analyzing the deformation monitoring data, and determining a coordinated deformation rule of the left and right bridges; and generating a splicing construction scheme according to the dynamic stress distribution and the coordinated deformation rule. And the decoupling problem of a digital model and a physical entity is eliminated. The problem of stress control blind areas is solved, stress space-time evolution is quantified, it is ensured that stress prediction covers all stages of construction, and the blind areas of a conventional static model are avoided. The problem of quantitative deficiency of the coordination deformation rule is solved, and the defect of neglecting the deformation coordination is avoided. The problem of construction decision lag is solved, the structural damage probability and temperature cracks are reduced, and coupling of construction execution and a physical mechanism is ensured.

The invention relates to an efficient concrete crack detection method, device and system. The method comprises the following steps: acquiring an image of a to-be-detected concrete beam; generating a hierarchical grid backbone network of redundant features based on linear transformation, and performing feature extraction processing on the to-be-detected concrete beam image to obtain multi-scale feature information; performing feature fusion processing on the multi-scale feature information based on a geometric perception dynamic feature pyramid network to obtain fused feature information; based on task alignment of the dynamic detection head and classification and positioning processing of the fusion feature information, the target crack information corresponding to the to-be-detected concrete beam image is obtained, the concrete crack detection accuracy is improved, the weak texture feature extraction and retention capability is significantly enhanced, the leak detection risk of fine cracks is effectively reduced, and the detection efficiency is improved. The anti-interference capability under a complex background is enhanced, the false detection rate is reduced, mismatching of classification and positioning tasks is avoided, and the crack positioning precision is improved.

The utility model discloses an inclined column template support frame for cast-in-place of a concrete beam, which is characterized in that a vertical steel pipe upright post and an inclined steel pipe upright post are fixedly arranged on a bearing platform by utilizing bearing platform anchor bolts, and the vertical steel pipe upright post and the inclined steel pipe upright post are pulled into a whole by a horizontal pull rod along the direction of a bridge; the inclined steel pipe stand columns at the corresponding positions in the single span are connected into a whole through corner connectors and horizontal cross rods. The unloading blocks are arranged on the top faces of the vertical steel pipe stand columns and the top faces of the corner connectors respectively. A bearing beam is placed on the top face of the unloading block in the transverse bridge direction, a bailey beam is arranged on the top face of the bearing beam in the bridge direction, a distribution beam is placed on the top face of the bailey beam in the transverse bridge direction, and the batter post formwork supporting frame for concrete beam cast-in-place is formed. The bearing platform is fully used as a supporting point, the inclined steel pipe stand columns are arranged to share the upper load, a strip-shaped foundation does not need to be additionally arranged, construction cost is saved, the spanning capacity of the support is greatly improved, and the support is a preferable scheme for spanning rivers, roads and bridge sites in a large-span mode when the geological environment is poor.

The invention discloses a concrete beam damage assessment method and system fusing crack images and multi-scale features, and relates to the technical field of structural health monitoring. The method comprises the following steps: firstly, obtaining a binary image based on an original crack image of a concrete beam body; then, explicit features representing the macroscopic geometrical morphology of the crack are extracted from the binarized image, and implicit features representing the microscopic complexity and heterogeneity of the crack based on the multi-fractal theory are extracted from the binarized image; secondly, fusing the two types of features to form a fused feature space; and finally, training a machine learning model based on the feature space, establishing a nonlinear mapping relation between the machine learning model and a concrete beam damage factor, and realizing automatic and quantitative evaluation of a damage state by using the model. According to the method, dominant and recessive multi-scale features are fused, the defects that a traditional method depends on artificial experience and feature extraction is one-sided are overcome, the damage state can be represented more comprehensively and accurately, and the objectivity, accuracy and efficiency of evaluation are remarkably improved.

The invention relates to the field of concrete beam damage detection, in particular to an ultrasonic imaging method for concrete beam damage detection, which comprises the following steps: arranging a linear array comprising a plurality of ultrasonic probes on a single-side contactable surface of a to-be-detected concrete beam; preparing a multi-channel ultrasonic transmitting and receiving instrument, and connecting the multi-channel ultrasonic transmitting and receiving instrument with the sensor array and the control computer; a multi-channel ultrasonic device is used to work in a full-matrix capture mode, in the full-matrix capture mode, each probe is sequentially excited to emit ultrasonic pulses, and time domain signals received by all the probes of the array are synchronously recorded to obtain an original full-matrix data set. According to the method, strong scattering noise generated by the concrete aggregate can be inhibited through the deep convolutional neural network so as to improve the signal-to-noise ratio of the image, the sound velocity field conforming to the non-uniform characteristic of the concrete can be constructed through local sound velocity inversion and iteration based on the strong reflection points, the problems of imaging artifacts and form distortion are avoided, and the accuracy of the imaging process is improved. And the concrete damage detection precision is ensured.

The invention relates to the technical field of supporting structures, and discloses a prefabricated steel-concrete combined supporting structure and a design and construction method thereof. Comprising an outer steel pipe, an inner steel pipe, ultra-high performance concrete, an inner ring plate, an outer ring plate, high-strength bolts, stiffening ribs, steel bar connectors, embedded steel bars, joint square steel plates, U-shaped joint steel bars, cast-in-place concrete joint beam reinforcing bars, a cast-in-place concrete beam, bolt holes and joint steel bar welding spots. The outer steel pipe and the inner steel pipe are large and small circular steel pipes which are concentrically arranged, ultra-high performance concrete is poured between the outer steel pipe and the inner steel pipe to form a body of the prefabricated support, and the multiple sections of supports are connected through the inner ring plate, the outer ring plate and the high-strength bolts, the steel bar connectors, the embedded steel bars, the joint square steel plates, the joint steel bars and the cast-in-place concrete joints form connecting joints of the prefabricated supports. Compared with a traditional reinforced concrete support, the steel-concrete combined support has the higher mechanical property, is detachable, convenient to construct and environmentally friendly.

The present application belongs to the technical field of concrete beam-column structure, and specifically relates to a beam-column structure with locally internally arranged thin-walled steel pipes and a mounting method thereof. By reasonably arranging the internally arranged steel pipes and steel bars, the effects of reducing the self weight and improving the bearing capacity of the structure are achieved. The application of the steel pipes not only enhances the bending and shearing resistance of the concrete components, but also effectively delays the generation and expansion of cracks. In addition, due to the high strength and rigidity of the steel pipes, the structure can still remain stable under high load conditions, and is particularly suitable for occasions requiring high bearing capacity, such as bridges and buildings. A new design method of internally arranged steel pipe concrete is proposed by fully considering the stress characteristics of the beam-column components. Through detailed analysis of the structural details and working principles, professional technicians can implement the present application according to the description, so as to effectively improve the safety and economy of the engineering structure. The present application is used for improving the shearing, bending and overall stability of the structure.

The application discloses a concrete connecting structure and a construction method thereof, relates to the field of structural engineering, and aims to solve the problem of high maintenance difficulty of a reinforced concrete beam and a reinforced concrete structure connected through a hinged mode. The concrete connecting structure comprises a support, a beam and a connecting joint. The concrete support of the support and the concrete beam of the beam are distributed at intervals along a first straight line direction. One end of each node longitudinal reinforcement of the connecting joint is anchored and connected with the concrete support, and the other end of each node longitudinal reinforcement is anchored and connected with the concrete beam. A concrete connecting piece is filled between the concrete support and the concrete beam along the first straight line direction and connects the concrete support and the concrete beam. The node longitudinal reinforcement between the concrete support and the concrete beam is located in the concrete connecting piece, and the linear rigidity of the connecting joint is smaller than that of the beam. The concrete connecting structure is used for connecting the support and the beam.

The invention relates to a construction method for quickly dismantling a concrete beam, which comprises the following steps: determining a to-be-cut position on the concrete beam, determining the position of a structural reinforcing steel bar in the concrete beam at the end part of the to-be-cut position, excavating a notch corresponding to the position of the structural reinforcing steel bar, the notch continues to be excavated until the structural steel bars in the concrete beam are completely exposed; concrete around the structural steel bars is removed; a fret saw is provided, the fret saw is arranged at the top of the area to be dismantled, the fret saw is arranged in the notch in a penetrating mode, the fret saw is arranged below the structural steel bars, and the concrete at the bottom of the notch is cut through the fret saw till the concrete beam is completely cut off; a jig frame is provided, the jig frame is arranged on a to-be-dismantled lower construction area of the concrete beam, and the top of the jig frame is attached to the bottom of the concrete beam; and the structural steel bars are cut off, so that the positions to be cut off fall onto the jig frame, a forklift is provided, and the concrete blocks falling onto the jig frame are transferred through the forklift.

The invention discloses a concrete beam quick release mold and a using method thereof, and belongs to the technical field of concrete beam molds, the concrete beam quick release mold comprises a bottom plate, a supporting plate, a first mold assembly and a second mold assembly, the supporting plate is fixedly mounted in the middle of the top end of the bottom plate, and a bottom mold plate is fixedly mounted at the top end of the supporting plate; first supports are fixedly mounted on the outer walls of the left side and the right side of the supporting plate correspondingly, and a first mold assembly is mounted on each first support. Second supports are fixedly installed on the outer walls of the front side and the rear side of the supporting plate correspondingly, and a second mold assembly is installed on each set of second supports. A servo stepping motor is started to control a worm to rotate, a worm gear meshed with the worm can drive a mounting shaft, a second bevel gear, a second transverse shaft and a second side formwork to rotate and open, the two first side formworks and the two second side formworks are controlled to synchronously rotate to be in a horizontal state, rapid demolding of a formed concrete beam is facilitated, disassembly is rapid, and the efficiency is high. The use is convenient, and the production and manufacturing efficiency of concrete beams can be improved.

The application discloses a kind of concrete beam's near-field dynamics heterogeneous simulation method and system, comprising: obtaining the analysis model of concrete beam, and the analysis model is dispersed into material point in space;The material point is traversed, and the range of the analysis model is divided into aggregate particle area and non-aggregate particle area, wherein the aggregate particle area includes different sizes aggregate particles, and the non-aggregate particle area includes the gap between the aggregate particle area;According to the range of the material point on the analysis model, different material properties are configured to the material point, wherein the material point of the aggregate particle area is configured with aggregate material properties, and the material point of the non-aggregate particle area is configured with matrix material properties;According to the material properties, the near-field dynamics heterogeneous simulation of the concrete beam is carried out.Reduce the distribution of aggregate particles in real situation, improve simulation accuracy.

The utility model discloses an overflow type immersed roadbed structure. A roadbed main body is composed of backfilled gravelly soil and slope protection; a roadbed backfilling area is arranged below the pavement structure layer, the roadbed backfilling area is composed of backfilled gravelly soil, and an overflow channel is arranged on the geological condition stable side of the roadbed; a high-pressure jet grouting diaphragm wall is arranged in the center of the roadbed, and the bottom of the high-pressure jet grouting diaphragm wall extends to bed rock; by means of the design of the overflow channel, it is guaranteed that flood can be smoothly discharged under the condition of the designed flood level, the situation that the roadbed is damaged due to the fact that the flood overflows the dam is avoided, the overflow channel foundation is reinforced through consolidation grouting, and it is guaranteed that the overflow dam structure is stable and safe; through the design of the high-pressure jet grouting diaphragm wall and the gabion protection slope, the stability of the roadbed under the condition of high water level is ensured, and the risks of leakage and landslide are reduced.

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

The application relates to a construction method suitable for a dense longitudinal ribbed steel reinforced concrete beam, which comprises the following steps: installing a first open hoop at the bottom of a beam body on one side of a column; installing a bottom rib at the bottom of the beam body and binding the bottom rib with the first open hoop; arranging a steel beam between the first open hoop; arranging a second open hoop at a column-beam joint and connecting the second open hoop to the end of the steel beam; arranging a top rib and a third open hoop at the upper part of the beam body; arranging a first rib body and a second rib body of an adjacent span beam on the other side of the column; installing a formwork on both sides of the beam body after the column is poured; and pouring concrete in the formwork to form the steel reinforced concrete beam. The steel rib of the steel reinforced concrete beam is bound first, and then the steel rib of the adjacent span beam is bound, so that the construction sequence is optimized, the conflict between the steel beam and the adjacent span beam can be effectively avoided, the steel beam and the column are effectively connected through the second open hoop, the stable connection of the beam-column joint is realized, and the construction efficiency and quality are improved.

The application relates to a design and construction method of an assembled concrete pipe gallery. The construction method comprises the following steps: S1, prefabricating a concrete column and a concrete beam, the end of the concrete beam is reserved with exposed beam end steel bars, and the connecting side surface of the concrete column is embedded with protruding column side steel bars; S2, hoisting the concrete column, anchoring the lower end of the concrete column in the bearing platform foundation, and adjusting and fixing the verticality and elevation; S3, installing an independent temporary support structure between two adjacent installed concrete columns; S4, hoisting the concrete beam, erecting the two ends of the concrete beam on the temporary support structure, and cross-over arranging the beam end steel bars and the column side steel bars to form a steel bar connecting joint; the application greatly reduces high-altitude operation and the use of a scaffold, the main operation is completed on the ground or at low altitude, the safety risk is reduced, prefabrication and installation can be carried out in a flow, and the construction period is significantly shortened.

The invention discloses a concrete-filled steel tubular column and concrete beam connecting structure, and relates to the technical field of steel reinforced concrete, the concrete-filled steel tubular column and concrete beam connecting structure comprises a steel tubular column and a beam frame distributed on the side face of the steel tubular column, a fixing mechanism is arranged between the steel tubular column and the beam frame, and the fixing mechanism comprises a set of hoop plates which are connected and fixedly welded to the outer side of the steel tubular column in a sleeving mode; a bracket plate is welded and fixed between the two hoop plates; a reinforcing mechanism is arranged in the steel pipe column and comprises an inner lining plate fixedly welded to the interior of the steel pipe column, a pair of reinforcing plates are fixedly welded to the upper end and the lower end of the inner lining plate respectively, and a set of inner sleeve pieces are fixedly welded to the side face of each reinforcing plate. A plurality of outer arc plates which are closed mutually are distributed on the outer side of the steel pipe column in an attached mode, and the outer arc plates are distributed between the two hoop plates. The connecting structure of the concrete filled steel tubular column and the concrete beam has the effects of high stability and high structural strength.

This invention relates to the field of building construction technology, specifically to a prefabricated steel column corbel and steel-concrete beam joint, comprising an installation sleeve that is fitted onto the steel column corbel, which is mounted on the steel column. The installation sleeve has side grooves on both sides, into which steel-concrete longitudinal reinforcement bars are inserted. One end of each steel-concrete longitudinal reinforcement bar is inserted into the steel column. A limit frame is inserted into one end of the installation sleeve, and a hoop is integrally formed on the surface of the limit frame. A rubber clamp is provided between the hoop and the steel-concrete longitudinal reinforcement bar. The advantages are: by adopting a prefabricated technical solution, the installation sleeve containing the steel-concrete longitudinal reinforcement bars is directly fitted onto the steel column corbel, which greatly reduces the workload and time of on-site construction compared to the existing method of directly binding the reinforcing steel frame on site.

The utility model discloses a pre-stress concave type end post-tensioning large-span concrete beam tensioning device, which relates to the technical field of building construction and comprises a base, a lifting mechanism is arranged on the upper surface of the base, a cutting mechanism is arranged on the surface of the lifting mechanism, a jack is fixedly arranged at the top of the lifting mechanism, and the cutting mechanism is arranged on the top of the lifting mechanism. The position of the cutting mechanism corresponds to that of the jack; the lifting mechanism comprises a transmission box fixedly connected to the upper surface of the base, and two lifting lead screws are rotationally connected to the upper surface of the transmission box. The lifting mechanism is arranged on the surface of the base, the lifting mechanism can be used for adjusting and positioning the height of the jack, so that the jack is aligned and positioned with the positions of the steel cables on the two sides of the concrete beam, and then the steel cables can be tensioned conveniently through the jack in the follow-up process; the stability of the jack in the steel cable tensioning process is effectively improved, adjustability is high, operation is convenient and fast, and construction efficiency can be improved.

This invention discloses a reverse construction method for a continuous steel truss web-plate truss double-layer composite rotating bridge. The method involves first erecting a support platform parallel to the railway direction to assemble all the steel structures, then sequentially pouring and tensioning the steel strands of the concrete beam segments, followed by dismantling the support platform and installing temporary steel supports for the rotation construction. This invention enables the safe and efficient hoisting and installation of the upper-layer giant steel truss web-plate truss composite structure, thus successfully completing the construction of the entire continuous steel truss web-plate truss double-layer composite rotating bridge spanning the railway. Simultaneously, by connecting the cast-in-place support formwork to the upper-layer steel truss structure, the reverse beam support function of the upper-layer steel truss is fully utilized during the pouring of the lower-layer concrete beams.

The application discloses a self-resetting assembled concrete shear wall device, which comprises an assembled concrete shear wall I, an assembled concrete shear wall II, a shearing type energy dissipation section and a self-resetting connection; the assembled concrete shear wall I comprises end longitudinal reinforcement I, sleeve longitudinal reinforcement I, middle longitudinal reinforcement I, a grouting sleeve and a pre-buried component; and the assembled concrete shear wall II comprises end longitudinal reinforcement II, sleeve longitudinal reinforcement II, middle longitudinal reinforcement II and a pre-buried component. The self-resetting connection at the left and right sides of the bottom provides energy dissipation capacity and self-resetting capacity, and prevents the concrete at the left and right sides of the bottom from being damaged under the action of tension. Meanwhile, the shearing type energy dissipation section at the middle bottom can provide sufficient shearing bearing capacity for the assembled concrete beam force wall, so that the shear wall body at the left and right sides of the bottom will not be sheared and damaged after being weakened, and the device has the characteristics of reasonable force bearing, simple structure, good seismic performance, strong self-resetting capacity, small damage after earthquake and the like.

The application discloses a device and method for testing the torsional performance or shearing performance of a recycled concrete beam test piece, which comprises a first jack, a force transmission gear is arranged on the piston rod of the first jack; a sleeve hoop is used for clamping the concrete test piece; a sleeve hoop gear is arranged on one side of the sleeve hoop, the force transmission gear and the sleeve hoop gear are engaged, the sleeve hoop is driven to rotate through the lifting of the first jack, and torsional damage of the concrete test piece is caused; a heating mechanism is used for heating the concrete test piece; a second jack is used for applying pressure to the shaft end of the concrete test piece, so that the concrete test piece is in the state of axial compression; and a third jack is used for applying pressure to the side of the sleeve hoop which is not provided with the sleeve hoop gear; the application can be used for testing the torsional and shearing strength of the concrete beam under the coupling action of high temperature and axial compression. The device tests the torsional and shearing strength of the structure under the coupling action of high temperature and axial compression.

This invention discloses a method and system for evaluating the overturning resistance of flange plates, including a comprehensive evaluation method for the structural condition of concrete T-beam flange plates, and the dimensions and parameters of the flange plate overturning resistance test model, as well as the test method and evaluation method. This test and evaluation method can assess the damage state and overturning resistance of existing concrete T-beam flange plate structures, ensuring the safety of T-beam flange plate structures during operation.

The utility model discloses a sash beam and plant-growing concrete combined side slope protection structure which comprises a supporting frame system, wherein a rectangular grid structure is formed by vertically and horizontally crossed reinforced concrete beams; the ecological surface protection system comprises a vegetation concrete layer and surface vegetation which are filled in the grid structure; the anchoring system comprises a pre-stressed anchor rod vertically inserted into the side slope rock-soil body and an anchorage device for connecting the anchor rod with the reinforced concrete beam; the drainage system is composed of permeable pipes pre-buried in the reinforced concrete beams; compared with the prior art, the slope vegetation restoration structure has the advantages that the vegetation-growing concrete layer is filled in the grid structure formed by the reinforced concrete beams, and the surface vegetation is arranged, so that the vegetation restoration of the slope is realized, and the slope vegetation restoration structure is favorable for maintaining water and soil, beautifying the environment and maintaining ecological balance; the protective structure and the vegetation concrete layer work cooperatively, and the stability and the reliability of the protective structure are improved.

The invention relates to the technical field of bridge engineering, in particular to a roof-overhung composite girder bridge combination section structure and a closure construction method.The roof-overhung composite girder bridge combination section structure comprises a steel-concrete mixing section, an overhung roof, a bearing plate, a mixing section roof, a mixing section bottom plate, shear nails, PBL shear keys, a concrete beam, a triangular support and a pouring opening, and the steel-concrete mixing section is connected with the concrete beam; the cantilever top plate is formed by performing right-angle sectioning on the combination section; the bearing plate, the steel-concrete mixing section and the cantilever top plate jointly form a combined section whole body; the shear nails and the PBL shear keys are uniformly distributed on the mixing section top plate and the mixing section bottom plate; the pouring openings are evenly distributed in the top plate. According to the invention, the triangular support is arranged below the combination section cantilever top plate by utilizing the internal cavity space of the combination section cantilever top plate, so that safe and efficient hoisting and closure are realized.

The invention relates to a tongue-and-groove-steel sleeve-prestress connection anti-bending joint for a full-fabricated concrete beam. The tongue-and-groove-steel sleeve-prestress connection anti-bending joint comprises a prefabricated concrete notch beam section, an externally-wrapped thin steel sleeve and post-tensioned prestressed steel bars. The two sections of precast beams are connected into a whole through transverse rabbets at the ends of the beam sections, steel-encased sleeves arranged at the end connecting areas, prestressed steel bars in prestressed ducts and the like to form the node overall connecting rigidity, and the rigidity of the whole-span beam structure and the continuity of internal force transmission are achieved. The technical advantages of flexibility, repeatability, replaceability and the like of tongue-and-groove structures, bolt joints, steel-encased sleeves and prestress connection construction are fully utilized, the comprehensive performance is good, longitudinal stressed steel bars at the beam end of the vertical joint face of the tongue-and-groove are discontinuous and do not appear or are embedded or overlapped, and the problems that in the prior art, the standardization degree is low, the structure is complex, and the construction cost is high can be effectively solved. The problems of low bearing capacity, high assembly precision requirement, high quality control difficulty, poor recoverability, repeatability and replaceability, incapability of adapting to extreme weather conditions and the like are solved.

The utility model provides a bridge reinforced concrete T-beam steel and concrete combination performance improving device which comprises a profile steel structure, the profile steel structure is fixed below a T-beam of a bridge, the profile steel structure comprises a base steel structure and a reinforcing steel structure, and the base steel structure comprises a horizontal steel plate, a first vertical steel plate and a second vertical steel plate. The horizontal steel plate is fixedly connected with the lower surface of a bridge T-beam web. The first vertical steel plate and the second vertical steel plate are fixedly arranged on the two sides of a bridge T-beam respectively. The reinforcing steel structure comprises first channel steel, second channel steel and batten plates, upper wing plates of the first channel steel and the second channel steel are fixedly connected with the lower surface of the horizontal steel plate, and the batten plates are fixedly distributed below the first channel steel and the second channel steel and are distributed at equal intervals in the extending direction of the bridge T-beam. The profile steel structure is arranged below the reinforced concrete T-shaped beam, the dead load of the T-shaped beam can be reduced, meanwhile, the reinforced concrete combination performance of the concrete T-shaped beam is improved, the structure is simple, cost is low, and the use performance of a bridge can be improved.

The application relates to a kind of annular bracket stiff concrete beam column node construction device and construction method, including beam column construction mechanism and construction driving mechanism;Beam column construction mechanism includes multiple construction frames, multiple construction frames are arranged side by side between. First gear and second gear are driven to transmit by motor, so that second gear drives rotating rod and connecting column to rotate, connecting column drives another second gear to rotate by sleeve, so that two second gears and two gear ring assemblies are driven, two gear ring assemblies can drive steel beam column to rotate by locking assembly, the surface of steel beam column can be conveniently laid on steel beam column by workman in multiple faces, avoid subsequent still need to carry out steel beam column hoisting to adjust angle and continue construction, lead to the problem of tedious, so as to improve construction efficiency;Extension assembly is connected by slider and sliding sleeve and construction frame, so that construction frame can be unfolded by extension assembly, so as to extend the support length of steel beam column.

The application discloses a steel formwork with partially detachable end part of prefabricated long and large box girder, belongs to the technical field of prefabricated concrete beam production, and has a downward detaching mechanism for the bottom die strip in the range of width D close to the end part along the direction of the bridge, and has an outward detaching mechanism for the side die block in the range of height H close to the bottom along the vertical direction, and the surface of the bottom die strip and the side die block after being detached can form a height difference with the surface of the outer formwork, the height difference being h. The use method is as follows: after the concrete is poured and completed, the end part of the outer formwork is subjected to a preset detaching behavior before the prestressed steel strand is tensioned, so that the contact surface provided by the outer formwork can effectively adapt to the upward deflection of the beam body after the prestressed steel strand is tensioned, and thus the phenomenon that the stress is concentrated at the end part of the beam body and the friction effect is remarkable is effectively improved, and the problem that cracks are generated at the edge of the end part of the bottom plate during the prefabrication of the long and large box girder is fundamentally solved.