1685 results about "Precast concrete" patented technology

The invention relates to the field of intelligent control of the production process of a concrete prefabricated part, and discloses a temperature and humidity parameter self-adaptive control method in the demolding process of the concrete prefabricated part, and the method comprises the steps: obtaining an electrical fingerprint signal representing the internal hydration state of concrete and an external environment temperature change rate signal through a pre-embedded sensing unit; the current temperature and humidity parameter tolerance domain boundary is dynamically determined through a preset two-dimensional lookup table based on the double-signal coupling relation, and the environment adjusting equipment is controlled to operate according to the current temperature and humidity parameter tolerance domain boundary. The system can adaptively adjust the control boundary according to the actual state of the component, and the control robustness and the resource utilization efficiency are remarkably improved while the quality is guaranteed.

The invention provides a method for evaluating the roughness of a superposed surface of a precast concrete component based on a two-dimensional image. The method comprises the following steps: carrying out image graying processing on the collected two-dimensional image to obtain a gray image of the superposed surface of the precast concrete component; calculating an image gray level co-occurrence matrix under different image gray level conditions; the contrast ratio and the gray scale entropy of the image gray scale co-occurrence matrix under different image gray scale conditions are calculated, and the weights corresponding to the contrast ratio and the gray scale entropy are calculated; and carrying out weighted summation on the contrast ratio and the gray entropy of the gray image of the superposed surface of the concrete prefabricated component under the maximum gray level, and calculating to obtain a roughness index of the superposed surface of the concrete prefabricated component, so as to evaluate the roughness state of the superposed surface of the concrete prefabricated component according to the roughness index. The method has the advantages of realizing quantitative evaluation of the roughness of the superposed surface of the concrete prefabricated component, being convenient to operate and the like.

The invention relates to the technical field of material physical testing, in particular to a computer-aided precast concrete component strength detection method which comprises the following steps: decomposing an actual ultrasonic echo signal of a detection point of a precast concrete component into a plurality of principal components, and determining suspected defect components from the principal components; determining a suspected defect interval in the suspected defect component, and obtaining the defect degree expression of the suspected defect component based on the duration of the suspected defect interval, the position in the suspected defect component and the defect condition; according to the method for detecting the strength of the concrete prefabricated part, the feature value and defect degree expression of each suspected defect component are fused, the defect degree of the detection point is obtained, and compared with an existing mode of simply comparing with a normal ultrasonic signal, the defect degree of the concrete prefabricated part is accurately recognized and obtained through the concrete prefabricated part strength detection method provided by the invention; the strength detection accuracy of the precast concrete component is improved.

The present invention relates to the technical field of the curing of precast concrete components, and in particular to an anti-cracking film covering device for a precast concrete component, and a film covering method. The anti-cracking film covering device comprises a film covering frame, wherein one side of the film covering frame is fixedly connected to side film covering modules distributed at the front and back; the top of the film covering frame is further fixedly connected to a horizontally arranged balance module; one side of the film covering frame is further fixedly connected to a synchronous movement module; and one side of the synchronous movement module is further fixedly connected to an obliquely arranged pressing module. In the present invention, by means of reserving a certain length of plastic film, a second hydraulic rod driving a friction plate to move downwards, and the bottom of the friction plate coming into contact with the plastic film, the purpose of fixing the plastic film is achieved; pulling the film covering frame realizes the covering of a precast component with a film by a single person; the arranged side film covering modules ensure that a side face of the precast component is pressed, thereby guaranteeing that the side face of the precast component is tightly covered with a film and ensuring the quality of the precast component; and under the action of a water pump, arranged nozzles can uniformly and stably water a surface of the precast component for curing.

The invention provides a node connecting structure of a fabricated building and a construction method of the node connecting structure, and relates to connecting nodes for splicing prefabricated concrete columns with foundation column piers, ground beams, interlayer beams, top beams and columns. Beam column connecting joints connected with the ground beams are located at the position 0.6-1 m below the ground layer, and inter-column connecting joints are located at the position 0.9-1.2 m above the elevation of the middle axis of the interlayer beams. Each node adopts a built-in box-type steel pipe or a steel tenon-and-mortise component and is fixed through tenon-and-mortise matching of a steel tenon and a steel mortise groove and a high-strength bolt, so that rapid and accurate assembly of the beam column or between the columns is realized; and after connection is completed, a formwork is erected in a node area, high-strength concrete is cast in place, and a steel reinforced concrete stress component is formed. And the shear bearing capacity, the integrity and the anti-seismic property of the joint are obviously improved. Meanwhile, components are prefabricated in a factory and assembled in a dry mode on site, construction is convenient and fast, quality is controllable, and the structure is suitable for assembly type buildings with high-rise and high-seismic fortification requirements.

The invention relates to the technical field of recycling of renewable resources, in particular to an asphalt pavement milling material cold-recycled prefabricated part and a preparation method, and the asphalt pavement milling material cold-recycled prefabricated part is prepared from the following raw materials in parts by weight: 45 to 53 parts of waste pavement milling material with the particle size of less than 4.75 mm, 19 to 27 parts of waste pavement milling material with the particle size of 4.75 to 9.5 mm, 20 to 28 parts of stone chips, 1 to 1.4 parts of mineral powder, 1.6 to 2.0 parts of silica fume, 4.6 parts of water, 2.3 to 2.7 parts of cement and 2.3 to 2.7 parts of foamed asphalt. According to the invention, the waste asphalt pavement milling material is used as the raw material of the concrete prefabricated component, so that the resource is saved, the utilization rate of the asphalt milling material is increased, and the green development concept is met; the prefabricated parts are manufactured through a cold regeneration process, compared with a traditional hot mix plant regeneration process, energy is saved, environment friendliness is achieved, emission of greenhouse gas is reduced, and therefore the problems that the hot mix plant regeneration mode is high in cost and carbon emission are solved.

The utility model belongs to the technical field of steel-concrete bridges, and particularly relates to a steel pipe concrete column type pier and steel box girder connecting structure with a steel sleeve reinforcing function. The utility model provides a steel pipe concrete column type pier and steel box girder connecting structure with a steel sleeve reinforcing function, which can be used for reinforcing a steel box girder by arranging in-pipe pre-cast concrete, a box girder bottom plate, a bottom plate opening, cast-in-place concrete, a vertical reinforcing steel bar, a penetrating hole, an inserting sleeve unit and an annular reinforcing frame body unit on a pier steel pipe. Therefore, the inserting sleeve unit and the annular reinforcing frame body unit can achieve the reinforced connection effect of a steel structure framework in cast-in-place concrete, it is guaranteed that the steel-concrete connecting structure has the tensile effect of steel and the compressive effect of concrete, and the connecting structure can be stably used for a long time.

The invention discloses a soft soil foundation embankment heightening and widening structure and a construction method, and belongs to the field of water conservancy projects. In order to solve the problems of uneven settlement, landslide instability and overlarge occupied area easily occurring when the soft soil foundation embankment is heightened and widened, the structure comprises precast concrete piles (top beams and ripraps are arranged on the tops of the piles) densely arranged at the slope toe outside the embankment, an inner side cantilever retaining wall (with drainage holes and a gravel inverted filter), geogrids laid in backfill soil in a layered mode, and CFG piles arranged on the lower portion in a plum blossom shape. The guardrail base and the flower bed are integrally poured with the retaining wall. The construction method comprises the steps of slide-resistant pile construction, earthwork excavation, CFG pile construction, retaining wall pouring, embankment body backfilling and embankment top road construction. Bidirectional control over settlement and horizontal displacement is achieved through cooperation of multiple structures, variable-stiffness leveling can be achieved by adjusting parameters of the CFG piles, and the variable-stiffness leveling structure has the advantages of skid resistance, stability, landscape optimization and land occupation saving and is suitable for soft soil foundation embankment upgrading and reinforcing projects.

The invention discloses a construction method for prefabricating a concrete steel shell combined section in a factory, and relates to the technical field of bridge construction, and the construction method comprises the following steps: S1, manufacturing a wallboard unit; s2, the inner wall plate units are positioned, then the outer wall plate units are positioned, and then welding is conducted to manufacture steel shell segments; s3, annular structure concrete between the inner wall plate unit and the outer wall plate unit is poured, and steel shell concrete segments are formed; s4, secondary machining is conducted on the steel shell concrete segments; s5, vertical position continuous matching pre-assembly is carried out, after pre-assembly is completed, matching parts are installed, and marker lines are marked; s6, bridge site hoisting and positioning are conducted on the steel shell concrete sections; s7, outer wall plates of the steel shell concrete sections are subjected to butt-joint penetration welding, and then inner wall plates are welded; and S8, concrete pouring is conducted on bridge site ring openings of the steel shell concrete sections, and machining is completed. The technical problem that the construction period is prolonged due to prefabrication of the steel shell sections of the steel shell concrete tower in the prior art is solved.

The invention discloses an intelligent pouring device for a prefabricated concrete inspection well and a machining method of the intelligent pouring device, and belongs to the technical field of intelligent manufacturing of prefabricated concrete members. The intelligent pouring device comprises a well mold assembly, a collaborative vibrating and supporting part, a pouring executing mechanism and a main controller; the well mold assembly is used for defining a concrete pouring cavity and comprises an inner mold body and an outer mold body which are arranged in a sleeved mode, a distributed temperature measuring array is arranged on the inner wall of the inner mold body, an ultrasonic receiving and transmitting matrix is arranged between the inner mold body and the outer mold body, and a partitioned temperature control unit is arranged on the outer wall of the outer mold body. The collaborative vibrating and supporting part is used for bearing the well mold assembly and applying vibration and comprises a bearing and supporting platform used for placing the well mold assembly, a weighing sensor is arranged on the bearing and supporting platform, a partition type vibrator set is further fixed to the outer wall of an outer mold of the well mold assembly, and the partition type vibrator set is arranged on the bearing and supporting platform. According to the invention, the real-time volume and mass data of the poured concrete are provided for the main controller.

The utility model discloses a bolted assembly type airport pavement structure, which comprises a plurality of adjacent prefabricated concrete upper cover plates and a plurality of prefabricated concrete base plates, the prefabricated concrete upper cover plates and the prefabricated concrete base plates are in bolted connection, each prefabricated concrete upper cover plate comprises an upper cover plate central part and four flange parts, the upper cover plate central part is a cube with the thickness of h, four flange parts with the thickness of h / 2 are arranged on the upper edges of the four side edges of the central part of the upper cover plate and partially extend outwards, the length of the long edge of each flange part is smaller than that of the central part of the upper cover plate, and the adjacent flange parts are not connected with each other; a boss is formed in the middle of the square precast concrete base plate with the thickness of h / 2, and the top face of the boss and the top face of the precast concrete upper cover plate are spliced to form a complete plane. The connecting mode is simple and practical, assembling and disassembling operation is easy and convenient, force transmission performance is excellent, and the stress requirement of an airport pavement structure is completely met.

The invention relates to the technical field of connecting joints in common building structures, in particular to a fabricated beam-column joint of a frame structure and a construction method of the fabricated beam-column joint. By means of the prefabricated concrete stand column, the bracket and the steel column sleeve which are integrally formed through pouring, the overall structural strength of the prefabricated concrete stand column, the bracket and the steel column sleeve is improved, and a structural supporting foundation is provided for later installation of the prefabricated concrete cross beam; beam limiting columns arranged at the front ends of the prefabricated concrete cross beams are clamped with beam limiting blind holes formed in the steel column sleeves and the brackets, so that connection and fixation between the beam columns are achieved; meanwhile, the front ends of the four prefabricated concrete cross beams are clamped with one another, so that the four prefabricated concrete cross beams are locked with one another; connection and fixation of the assembly type beam columns can be achieved without opening holes and arranging bolts in the areas where the prefabricated concrete stand columns and the cross beam bodies are located, and the beam columns at the connecting positions are not prone to damage.

The invention relates to the technical field of precast concrete proportioning, and discloses a precast concrete proportioning optimization method and system based on artificial intelligence. The system comprises a mix proportion design scheme obtaining module which is used for obtaining a first mix proportion scheme according to material proportion hierarchy according to component engineering requirements; the environmental parameter acquisition module is used for acquiring real-time environmental data of a production area; the performance reference prediction module is used for calculating reference parameters according to the material performance characteristic matrix in the first scheme and determining a first performance reference vector; the environment evolution prediction module is used for obtaining a multi-stage production environment parameter sequence based on a real-time data prediction trend; the performance deviation evaluation module is used for obtaining multi-stage performance deviation vectors through a prediction model in combination with the reference vector; the optimization decision generation module optimizes the allocation ratio parameters according to the allocation ratio parameters and generates an optimization strategy; and the proportioning control execution module is used for proportioning equipment parameters according to a strategy. The system adapts to a dynamic production environment, and accurate matching and stable quality are guaranteed.

The invention discloses a municipal road inspection well anti-sedimentation structure and a construction method, and relates to the field of inspection well anti-sedimentation structures. The anti-sedimentation structure of the municipal road inspection well comprises a precast concrete shaft, the reinforcing steel bar reinforcing frame comprises a plurality of annular reinforcing steel bar sets which are arranged in the height direction of the prefabricated concrete shaft in a sleeving mode at intervals, each annular reinforcing steel bar set comprises at least one annular reinforcing steel bar, and the annular reinforcing steel bars are sequentially arranged in the circumferential direction of the prefabricated concrete shaft from inside to outside. And the number of the annular steel bars in each group is gradually reduced from bottom to top along the height direction of the precast concrete shaft. By arranging the frustum-shaped steel bar reinforcing frame which is integrally narrowed upwards, on one hand, the pressure around the well is diffused to peripheral concrete in a gradient mode, stress concentration is reduced, on the other hand, the bottom reinforcement density is increased, and the anti-floating stability is remarkably improved.

The invention discloses a heat preservation integrated floor slab system of an assembly type modular steel structure trestle, and belongs to the technical field of assembly type steel structure trestles. A floor slab module is composed of a plurality of prefabricated concrete groove-shaped plates arranged in sequence, and heat preservation materials are arranged at the bottoms of the prefabricated concrete groove-shaped plates; the multiple prefabricated concrete groove-shaped plates are sequentially arranged in the square frame in the length direction of the end transverse beams. Compared with an existing traditional floor slab system construction mode, installation is convenient and efficient, and on-site wet operation is little.

To reduce the manufacturing cost of a buried form, simplify the construction of the buried form, excel in strength characteristics, and reduce the possibility of deterioration.SOLUTION: A concrete structure 1 includes a buried form 2 made of precast concrete and constituting an outer shell of the structure, and infilling concrete 3 placed at the site inside the buried form 2. The buried form 2 is constituted by sequentially stacking unit forms M unitized for each placing height of one span of the infilling concrete 3. The unit form M is constituted by assembling a plurality of divided buried forms 4 divided respectively in the vertical direction and the horizontal direction, and the plurality of divided buried forms 4 are fixed to a plurality of panel fixing steel materials 5 arranged along the vertical direction and at intervals in the horizontal direction on the inner surface side.SELECTED DRAWING: Figure 1

The utility model provides a structure for reducing floating of an existing tunnel below caused by river excavation. The structure comprises a prefabricated concrete anti-floating plate arranged above the existing tunnel. The structure further comprises a fixing assembly, one end of the fixing assembly is connected with the prefabricated concrete anti-floating plate, and the other end of the fixing assembly extends in the direction of the tunnel hole and extends into a soil body. Preformed holes are formed in the positions, corresponding to the fixing assemblies, of the prefabricated concrete anti-floating plate, and the multiple preformed holes are evenly formed and used for fixing the fixing assemblies. According to the structure for reducing upward floating of the existing tunnel below caused by river excavation, by arranging the fixing assembly, the construction process can be simpler, and maintenance is more convenient.

The invention relates to an assembly type integrated fire-fighting smoke exhaust fan room structure which comprises a machine room enclosure bulkhead cylinder body which is provided with a bottom plate, a first side wall and a second side wall, the first side wall and the second side wall are connected with the bottom plate and vertically arranged in parallel, and the two ends of the machine room enclosure bulkhead cylinder body in the horizontal direction are provided with a first opening end and a second opening end which are oppositely arranged correspondingly; the end cover side wall is provided with a first end cover and a second end cover which are respectively arranged at the first opening end and the second opening end; smoke suction and exhaust ports are formed in the first end cover and the second end cover and are used for being connected with a ventilation pipeline; the machine room access door is arranged on the first side wall or the second side wall and can be opened and closed; the fan is arranged in an internal space formed by the machine room enclosure bulkhead cylinder body, the first end cover and the second end cover; the machine room enclosure bulkhead cylinder body, the first end cover, the second end cover and the machine room access door are all of a prefabricated concrete structure. The fabricated integrated design is adopted, the cost is low, the self weight is light, fireproof performance is achieved, and the advantages of being stable, reusable, attractive and the like are achieved.

The utility model discloses a formwork reinforcing and opposite-pulling device for building construction, and relates to the technical field of building construction auxiliary devices. The rotating rod is rotatably arranged on the penetrating pipe in a penetrating mode, the two ends of the rotating rod penetrate out of the two ends of the penetrating pipe respectively, the two ends of the rotating rod are each provided with a threaded section, and the screwing directions of threads of the two threaded sections are opposite; the number of the nut sleeves is two, and the two nut sleeves are connected to the two threaded sections in a threaded and sleeving mode correspondingly. And the pressing bracket is fixedly connected to the periphery of the nut sleeve. By arranging the penetrating pipe, the penetrating pipe is inserted into preformed holes of a concrete precast slab and a formwork, then the rotating rod rotates, the two threaded sections are screwed with the two nut sleeves in a threaded mode, in the threaded screwing process, the two nut sleeves drive the two pressing supports to move relatively, the pressing supports abut against the surface of the formwork, and therefore the formwork can be fixed. And then extrusion force is generated on the formwork, and the formwork is reinforced.

The invention discloses a building pile foundation construction device convenient for quick positioning, comprising a base, the upper end of the base is rotatably connected with a turntable, the upper end of the turntable is fixedly connected with a hollow stand column, the stand column is slidably connected with a hollow lifting column, and the top of the lifting column is fixedly connected with a connecting block. The left side of the connecting block is fixedly connected with a guide rail frame through a connecting arm, a left hoop type clamping jaw and a right hoop type clamping jaw are arranged in the guide rail frame, and a through hole is formed in the position, located on the right side of the rotating disc, of the upper end of the base. The first driving motor drives the rotating disc to rotate, the clamped prefabricated concrete small pile can be rapidly rotated to a pile foundation point position, the first positive and negative tooth lead screw is controlled in cooperation with the third driving motor to enable the left hoop type clamping jaw and the right hoop type clamping jaw to move oppositely to clamp a pile body, and the positioning efficiency and accuracy are greatly improved; and time and errors of manual measurement and adjustment are reduced.

The invention discloses a polycarboxylate superplasticizer with a linear water-reducing rate as well as a preparation method and application of the polycarboxylate superplasticizer. The water reducing agent is prepared from a polyether macromonomer phosphating derivative, a carboxylic acid monomer, a sulfonic acid monomer, an ester slump retaining monomer, a linear regulation and control monomer and other units through a free radical emulsion polymerization process. Compared with a traditional polycarboxylic acid water reducer, the water reducer has more regular side chain arrangement, higher charge density, higher adsorption capacity and more stable dispersing performance, the water-reducing rate can be linearly increased along with the increase of the mixing amount within the effective mixing amount range, and the water-reducing efficiency is improved. The problem that the concrete fluidity is difficult to control due to nonlinear fluctuation of the water reducing rate of a traditional polycarboxylic acid water reducing agent is solved, and the method has important significance on improving the concrete construction stability and the engineering quality. The product provided by the invention has excellent mud resistance and slump loss resistance besides high linear water-reducing rate, is suitable for various cast-in-place and precast concrete projects, and has remarkable economic value and application prospect.

The invention provides an ecological slope protection structure and a construction method thereof, and relates to the field of slope engineering, the ecological slope protection structure comprises a geocell arranged in a shallow soil body of a slope surface, and plants are planted in the geocell; the precast concrete beam is arranged on the upper surface of the geocell and is arranged along the inclination direction of the slope slope surface; the cast-in-place concrete beams are arranged on the slope top, the slope middle and the slope toe respectively, the cast-in-place concrete beam located on the slope top is connected with the top of the prefabricated concrete beam, the cast-in-place concrete beam located on the slope toe is connected with the bottom of the prefabricated concrete beam, and the cast-in-place concrete beam located on the slope middle presses the prefabricated concrete beam on the slope face of the slope. The method has the effect of improving the overall stability of the slope.

The invention relates to an efficient assembly type steel-concrete composite beam bridge superstructure connecting structure and a construction method, and belongs to the technical field of bridge engineering. Comprising a prefabricated concrete bridge deck, a steel beam, an umbrella-shaped perforated steel pipe connecting piece, a high-strength hook, a wedge-shaped steel accessory, a pi-shaped metal part, an H-shaped high-strength steel accessory, a high-strength bolt and a nut. The wedge-shaped steel accessory is pre-buried in the transverse joint direction of the prefabricated concrete bridge deck slab through a pi-shaped metal part, the bridge deck slab in the transverse joint direction is fastened through an H-shaped high-strength steel accessory, and the H-shaped high-strength steel accessory and the wedge-shaped steel accessory are fastened through a high-strength bolt and a nut; the umbrella-shaped perforated steel pipe connecting pieces are welded to the steel beams, the high-strength hooks are pre-buried in the prefabricated concrete bridge deck in the longitudinal joint direction, the high-strength hooks and the umbrella-shaped perforated steel pipe connecting pieces are hooked tightly after the bridge deck is in place, longitudinal steel bars penetrate through the holes, in the bridge direction, of the umbrella-shaped perforated steel pipe connecting pieces, and finally high-performance grouting materials are poured in the longitudinal joints.

The utility model provides an offshore photovoltaic precast concrete composite pile, which comprises a pile structure, the pile structure comprises a concrete pile foundation and a steel hoop, the concrete pile foundation is triangular on the vertical projection plane of the composite pile, the concrete pile foundation comprises a concrete pile vertically arranged along the composite pile, and the steel hoop is arranged on the concrete pile. The pile structure further comprises a truss structure, and the steel hoop is connected with the end portion of the truss structure to form a triangular edge portion. According to the prefabricated concrete combined pile, the high-strength prestressed concrete piles are adopted, the steel truss structure is used for connecting the prestressed concrete piles together to form a space truss structure, and the space truss structure serves as an integrally stressed pile foundation structure, so that the combined pile is high in horizontal load bearing capacity and bending moment bearing capacity; and therefore, the pile body material and the work amount are saved.

The invention relates to the technical field of concrete prefabricated components, and particularly discloses high-strength corrosion-resistant concrete for a PHC pipe pile and a preparation method of the high-strength corrosion-resistant concrete. The high-strength corrosion-resistant concrete is prepared from the following raw materials in parts by weight: 12 to 16 parts of silica fume, 30 to 40 parts of cement, 30 to 35 parts of slag powder, 100 to 120 parts of aggregate, 1.5 to 2.5 parts of polycarboxylic acid type water reducing agent, 3 to 5 parts of slow-release type preservative, 0.3 to 0.8 part of organic amino alcohol, 0.1 to 0.3 part of cerous nitrate and 15 to 25 parts of water. The preparation method comprises the following steps: dry-mixing the cement, the slag powder, the silica fume and the slow-release preservative to form a gel mixture; adding water, a polycarboxylate superplasticizer, organic amino alcohol and cerous nitrate into the gelling mixture, and stirring and wet-mixing to obtain the high-strength corrosion-resistant concrete. The composition can be used in projects such as ports, bridges and high-rise buildings, and has the advantages of high strength and good corrosion resistance.

The present invention of the polymer bricks that are considered highly efficient in terms of mechanical properties, providing thermal insulation in buildings and reducing the operating energy of the building and the energy embodied in the manufacturing stages compared to concrete bricks (blocks) or ready-made concrete. The lattice-based plastic brick includes at least two solid plates and a plurality of lattice unit cells. The two solid plates include an inner layer and an outer layer. The lattice unit cells are sandwiched between the at least two solid plates in a predefined manner. The lattice unit cells is designed using topologies comprising triangle, diamond, hexagonal / honeycomb, cubic, polygonal, star, gyroid, and a combination thereof. The lattice unit cells includes struts of predefined thickness and length.

A reusable precast concrete slab connecting structure and a mounting method therefor, relating to the technical field of prefabricated buildings. The connecting structure comprises precast concrete slabs and a second connecting assembly. Each precast concrete slab comprises concrete, steel bars located in the concrete, and a first connecting member exposed out of the concrete, the first connecting member has a first side face and a second side face which are oppositely arranged, the first side face of the first connecting member is connected to the steel bars, and second side faces of first connecting members of adjacent precast concrete slabs are in direct abutment. The second connecting assembly is configured to connect and fix adjacent first connecting members, and the second connecting assembly is detachably connected to the first connecting members. The precast concrete slab connecting structure provided in the present invention solves the problem that the integrally assembled precast floor cannot be disassembled, facilitating repeated utilization of resources. Moreover, the second connecting assembly is configured to connect and fix the first connecting members, reducing the risk of local crushing of concrete at a connecting position, thereby prolonging the service life of the precast concrete slabs.

The invention provides a fabricated shear wall structure and a construction method thereof, and relates to the technical field of construction.After a lower prefabricated wall is installed and fixed, a prefabricated beam is hoisted, a beam end connecting assembly at the end of the prefabricated beam is connected with a lower wall top connecting assembly arranged at the top of the lower prefabricated wall, and a prefabricated floor slab can be hoisted after connection is completed; the prefabricated floor slab is placed on the top of the prefabricated beam or the lower prefabricated wall, then the upper prefabricated wall is hoisted, the upper wall bottom connecting assembly on the upper prefabricated wall is connected with the lower wall top connecting assembly, and therefore connection of the prefabricated beam, the upper prefabricated wall and the lower prefabricated wall is completed. Continuous and rapid assembly construction can be achieved, the construction period is effectively shortened, and the technical problems that in the prior art, grouting sleeves are adopted for connection between prefabricated concrete floors and shear walls and connection between beams and shear walls, the construction period is long, and temporary supporting structures need to be additionally used are solved.

The invention discloses a prestressed laminated slab as well as a manufacturing method and a using method thereof, and belongs to the technical field of constructional engineering. The prestressed laminated slab comprises a transverse pipeline, a prefabricated concrete bottom plate, reinforcing ribs, longitudinal prestressed tendons and transversely distributed steel bars, the transverse pipelines are arranged at intervals in the first direction, are partially embedded in the prefabricated concrete bottom plate and are parallel to the second direction; longitudinal prestressed tendons and transverse distributed steel bars are arranged in the prefabricated concrete bottom plate. The reinforcing ribs are arranged at intervals in the first direction, and the bottoms of the reinforcing ribs are fixed to the prefabricated concrete bottom plate. The first direction is the length direction of the precast concrete bottom plate, and the second direction is the width direction and is perpendicular to the precast concrete bottom plate. The reinforcing ribs can adopt various structures such as concrete ribs and steel pipe trusses, and light material blocks are arranged on the prefabricated concrete bottom plate and arranged in an area defined by the reinforcing ribs and the transverse pipelines. The manufacturing method comprises the following steps: cleaning a mold table, assembling the mold, distributing the reinforcements, tensioning, fixing the pipeline and the reinforcing ribs, pouring, maintaining and the like. During use, the two-way prestressed floor slab is formed through hoisting, pipeline connection, reinforcement, reinforcement penetrating, pouring, tensioning and grouting. The problems that an existing laminated slab is poor in stress performance, prone to cracking, insufficient in bonding strength and the like are solved, bidirectional prestress design, consistent bidirectional rigidity of a floor system and bidirectional force transmission performance are achieved, the integrality and crack resistance of a floor slab are improved, the self weight is reduced, the steel consumption is reduced, the construction process is simplified, and the laminated slab is suitable for large-span and heavy-load building scenes.

An integrated smoothing and roughening device for precast concrete parts comprises an external frame, a mold transport mechanism, and an end effector; the end effector is mounted on the external frame via a three-axis travel mechanism; the mold transport mechanism carries the precast concrete part and is located below the end effector; the end effector comprises a smoothing assembly, a roughening assembly, a horizontal rotation assembly, and a first drive assembly; the smoothing assembly and the roughening assembly are configured to be located at different radial positions on the rotation circumference of the same horizontal rotation assembly; the first drive assembly drives the rotation of the horizontal rotation assembly, causing the smoothing assembly to act on the precast concrete part for smoothing at the first time, and the roughening assembly to act on the precast concrete part for roughening at the second time. The present invention can achieve integrated smoothing and roughening operations.