2265 results about "Precast concrete" patented technology

The invention relates to the technical field of image processing, and discloses a precast concrete T-beam bubble detection method and system. The method comprises the following steps: carrying out multiband reflection data acquisition and calibration on the surface of a T-beam, and obtaining optimized data through light intensity compensation and band screening; performing spatial registration and noise reduction processing on the data, and fusing the data into an image; edge detection and image segmentation are carried out, and pore morphological features are extracted; calculating depth data and performing spatial reconstruction to obtain pore distribution data; performing statistical analysis on the distribution data to obtain a defect evaluation result; and finally generating a detection report. According to the method, accurate positioning and quantitative evaluation of bubble defects are realized through multi-source data fusion and deep analysis, a complete early warning and evaluation mechanism is established, and the reliability and practicability of a detection result are improved.

A U-shaped recycled concrete composite beam, and a design and construction method therefor, the U-shaped recycled concrete composite beam comprising a prefabricated concrete casing (11) and cast-in-place compression-zone concrete (12), wherein the prefabricated concrete casing (11) is a recycled concrete casing, and has a U-shaped appearance; the cast-in-place compression-zone concrete (12) is high strength concrete, and the cast-in-place compression-zone concrete (12) is concrete with a strength grade of C50-C80; the thickness h1 of the bottom of the prefabricated concrete casing (11) is not less than 80 mm, and the widths b1 and b3 of lateral surfaces of the prefabricated concrete casing (11) are both not less than 45 mm; the width b2 of the cast-in-place compression-zone concrete (12) is not less than 100 mm; and a steel bar cage is provided in the U-shaped recycled concrete composite beam to serve as a framework. Compared with the prior art, the fire-resistant characteristic of recycled concrete and the excellent mechanical properties of high-strength concrete are fully exerted, the flexural bearing capacity and ductility of the recycled concrete beam can be effectively improved at room temperature, the bursting phenomenon of a fire-exposed surface is reduced at a high temperature, and the temperature field in the beam is significantly reduced.

The invention relates to the technical field of bridge construction monitoring, and provides a digital twinborn digital-intelligent construction method and system for paving and erecting all-in-one machines. Under the construction operation working condition that a PK type section steel beam and a concrete prefabricated bridge deck slab are overlapped later, according to obtained construction monitoring sensing information of all the paving and erecting all-in-one machines in the main bridge construction process, the construction monitoring sensing information of all the paving and erecting all-in-one machines is obtained; oPC data is integrated to form logic and physical information and construction environment data information of the laying and erecting all-in-one machine, and modular association simulation driving is used for conducting three-dimensional simulation on main beam construction and associating construction monitoring data information through PLC programming data processing. The working posture and physical information state matching of each simulation model and dynamic construction simulation of the construction environment are completed, digital twin digital-intelligent construction of actual physical data is achieved, digital-intelligent development of bridge construction is improved, and the problem that in the prior art, under the PK type steel beam and prefabricated bridge deck slab post-overlapping asynchronous construction condition, the construction efficiency is greatly improved is solved. And the intelligent safety monitoring technology of the construction equipment and the steel beam structure is immature.

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.

According to the caisson wharf and the construction method thereof, a layered structure of a steel slag-rubber particle composite lower layer and a regenerated resin-basalt fiber composite upper layer is adopted for a base, and interface bonding is enhanced in combination with a silane coupling agent; the foundation bed is assembled by precast concrete modules and is poured by nano mortar; the caisson main body is provided with a positioning plate which is inserted into the guide groove, the caisson main body is filled with multi-graded steel slag fragments, and an independent airbag cavity is pre-buried in a bottom plate; the buoyancy control system dynamically adjusts the water injection rate based on multi-sensor data; the ecological permeable pipeline network adopts a diatomite-zeolite coating; the prestressed steel strand towing system is regulated and controlled in real time through the friction damper. The caisson wharf and the construction method thereof have the remarkable advantages in the aspects of structural stability, ecological friendliness, construction efficiency, intelligence and automation, the problems existing in a traditional caisson wharf can be effectively solved, and the requirements of modern port construction are met.

The invention provides a pressure maintaining grouting mechanism of a concrete prefabricated wall grouting sleeve, and relates to the field of concrete prefabricated walls. Comprising a lower precast concrete wall and an upper precast concrete wall; an upper steel bar section and a lower steel bar section are arranged in the upper prefabricated concrete wall and the lower prefabricated concrete wall correspondingly, the grouting sleeve is fixedly connected to the bottom end of the upper steel bar section in a sleeving mode, and the top end of the lower steel bar section extends into the grouting sleeve; the pressure maintaining bin is connected with a side frame, the side frame is detachably mounted on the outer wall of the upper prefabricated concrete wall through a mounting mechanism, one side of the bottom of the pressure maintaining bin fixedly communicates with a discharging pipe, and the bottom end of the discharging pipe is connected with a telescopic pipe; the blocking part is arranged in the discharging pipe, and a gap between the blocking part and the inner wall of the discharging pipe is adjustable; and the dragging mechanism is used for driving the plugging part to move in the discharging pipe. And the mounting mechanism is convenient to disassemble and assemble on the upper precast concrete wall surface, so that the whole body can be repeatedly used.

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 belongs to the technical field of building materials, and particularly relates to a light prefabricated concrete wallboard and a production method thereof. The light prefabricated concrete wallboard is prepared by coating the main component fly ash of the concrete wallboard and cooperating with the combined action of the carbon nanotubes and the basalt fibers, so that the compressive strength of the material is effectively improved, the impact resistance is improved, and meanwhile, good combustion performance is obtained.

The utility model relates to the technical field of building structures, in particular to a concrete module and a full-prefabricated concrete modular building structure system, which comprise shear wall leaf plates, partition walls, a top plate, a bottom plate and beam shells, the bottom plate serves as the bottom face of the concrete module, and the top plate serves as the top face of the concrete module. The shear wall leaf plates and the partition walls form the four side faces of the concrete module. The shear wall leaf plates are arranged at the corners of the concrete modules, and the partition wall is arranged between the two shear wall leaf plates. A first cavity used for pouring concrete is formed in the shear wall leaf plate; the height of the shear wall leaf plate is larger than that of the partition wall, the beam shell is arranged on the top of the partition wall, a second cavity used for pouring concrete is formed in the beam shell, and the second cavity is communicated with the first cavity so that the beam shell and the shear wall leaf plate can form a whole after the concrete is poured.

The invention provides a multi-story and high-rise full-prefabricated concrete modular building structure and a processing technology thereof, and relates to the technical field of building structures. The structure comprises module units, vertical connecting units and horizontal connecting units, the multiple module units are sequentially arranged in the horizontal direction to form a module combination layer, and the multiple module combination layers are sequentially arranged in the vertical direction to form a building structure; every two adjacent module units in the same module combination layer are connected through a horizontal connecting unit, and every two module units, located in the vertical direction, in every two adjacent module combination layers are connected through a vertical connecting unit. Module units are systematically prefabricated in an assembly type factory, the overall production quality of the module is ensured, it is ensured that reserved pre-buried point positions are correct, then all the module units are conveyed to a construction site, on-site hoisting and splicing are conducted on the construction site, the wet construction amount of the construction site is effectively reduced, the construction efficiency is improved, and manpower and cost are saved.

The present invention provides a frost heave strain test device for a concrete lined channel, and relates to the technical field of freeze-thaw cycle test devices, including a frost heave body storage bin, wherein a plurality of temperature sensors are evenly arranged at intervals from bottom to top at the axis of the frost heave body storage bin; a simulated lining, wherein the frost heave body storage bin below the simulated lining is filled with a frost heave soil layer, and an axial displacement monitoring device is used to detect the axial displacement of the simulated lining; by pumping freeze-thaw medium into the medium storage bin, the freeze-thaw medium exchanges heat with the frost heave body storage bin above, thereby causing the frost heave soil layer to undergo frost heave changes. The present invention replaces the traditional precast concrete lining structure with a simulated lining, and the simulated lining can be used repeatedly, and can further simulate concrete of different strength grades, thereby greatly reducing the consumption of raw materials, being fast, efficient, energy-saving and environmentally friendly; and at the same time, the existing scattered structures are integrated, thereby reducing the occupied space.

The present invention provides a precast concrete component, a precast concrete assembly and a splicing method thereof. The precast concrete component comprises a connection end, the connection end comprises a connection end face, a longitudinal groove arranged along the length direction of the connection end face, a connection steel bar accommodated in the longitudinal groove and a supporting steel bar fixedly arranged in the longitudinal groove; the supporting steel bar supports the connection steel bar, and the connection steel bar comprises a first side close to the connection end face; wherein the connection steel bar can move in the longitudinal groove, so as to be arranged in the longitudinal groove in an inclined state or a horizontal state, and when the connection steel bar is arranged in the longitudinal groove in a horizontal state, the first side extends out of the connection end face. The precast concrete component of the present invention has a simple structure and is very convenient to construct.

The invention relates to the technical field of concrete construction, in particular to concrete prefabricated part intelligent maintenance equipment which comprises a bottom frame, a first electric rotating roller, a door-shaped supporting frame and the like. Two pieces of H-shaped steel are symmetrically arranged on the lower side of the bottom frame front and back; the front side of the bottom frame is rotationally connected with a first electric roller; a protection blanket for preventing the concrete prefabricated part from being washed by rainwater is wound on the first electric rotating roller; the left side and the right side of the bottom frame are each provided with a door-shaped supporting frame. According to the device, the first electric rotating roller and the electric take-up roller are controlled to rotate cooperatively, so that a protection blanket slides in a limiting groove through a limiting block, the protection blanket automatically covers the upper portion of a stacked prefabricated part, automatic laying and winding of the protection blanket are achieved, manual operation is not needed, the laying and winding efficiency of the protection blanket is improved, and the production cost is reduced. And it is ensured that covering is completed before raining, and the prefabricated part is prevented from being damaged due to untimely protection.

The utility model relates to the technical field of vibrating devices, and provides a vibrating device for a concrete precast element, which comprises a top plate, brackets are symmetrically fixed on two sides of the top plate, and rollers are mounted at the bottom ends of the brackets; a hollow mounting frame is arranged, an air cylinder is rotationally mounted between the side wall of the mounting frame and the bottom wall of the top plate, two vibrating rollers are symmetrically fixed to the bottom of the mounting frame, and a mounting shaft is rotationally mounted at the axis position of each vibrating roller; the driving assembly is used for driving the mounting shaft to rotate; the cleaning assembly is used for cleaning the vibrating roller; by means of the technical scheme, the problems that in the prior art, a vibrating rod of a vibrating device is vertically arranged and can only conduct effective vibrating operation on the adjacent position, but when vibrating operation is conducted on concrete workpieces with large width and length, the position of the vibrating rod needs to be continuously adjusted in order to guarantee the vibrating effect, and the vibrating effect is affected are solved. The concrete is comprehensively vibrated, the operation is tedious, and the working efficiency is reduced.

The utility model provides a prefabricated concrete beam dry type connection node, which belongs to the field of prefabricated buildings, and is characterized in that an upper high-strength bolt is arranged above the top surface (within the height of a floor) of a prefabricated concrete beam so as to increase the connection arm of force of the upper high-strength bolt, so that equal-strength node connection with a steel bar in the beam is realized by utilizing a single large-diameter high-strength bolt; the installation convenience is greatly improved; the upper high-strength bolt and the lower high-strength bolt are combined for clamping, so that tensile and compression-resistant bidirectional force transmission is realized (in a normal state, the upper high-strength bolt is tensile, and the lower high-strength bolt is compression-resistant; ), so as to cope with the bending moment change of the precast concrete beam under the action of the reciprocating load.

The invention provides a Z-shaped prefabricated concrete wind power tower drum duct piece and a wind power tower drum. The concrete wind power tower drum duct piece comprises a duct piece lower layer and a duct piece upper layer. The transverse sections of the segment lower layer and the segment upper layer are concentric arcs with the same thickness and the same height and have an overlapped part, the thickness of the overlapped part is twice that of the segment lower layer or the segment upper layer, and the height of the overlapped part is 1 / 4-1 / 2 that of the segment lower layer or the segment upper layer; the overall height of the tower tube segment is 3-4 m. The wall thickness of a tower formed by the Z-shaped prefabricated concrete wind power tower tube segments is twice that of a tower formed by common arc-shaped segments, but the thickness of a single segment is not increased, and the bending resistance of the tower tube is improved while the Z-shaped prefabricated concrete wind power tower tube segments have the light characteristic. The inner layers of every two adjacent layers of annular units are nested in the outer layers, constraint is formed in the radial direction, the influence of pipe piece transverse splicing seams on the stability of the tower barrel is reduced, and the shear capacity of the tower barrel is improved.

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 discloses a precast concrete component processing device which comprises a bottom template, a first mounting plate is mounted in front of the bottom template, a two-way screw rod is rotatably connected to the first mounting plate, a second side template is in threaded connection with the outer side of the two-way screw rod, and a limiting rod penetrates through the rear end of the second side template. And a second mounting plate is mounted behind the bottom template, and is connected with the end part of the limiting rod. According to the precast concrete component machining device, the second side formwork can be driven to move and the position of the second side formwork can be adjusted through rotation of the two-way lead screw, the adjusting base arranged on the first side formwork can slide, so that the first side formwork can be smoothly clamped to the second side formwork, the first side formwork is sealed through the adjusting base, and it is guaranteed that the first side formwork and the second side formwork are attached; and the clamping position of the first side template on the second side template can be adjusted, so that a processing space formed by the first side template, the second side template and the bottom template can be adjusted.

The invention belongs to the technical field of prefabricated concrete drainage pipe production, and provides a prefabricated concrete drainage pipe with a corrosion-resistant concrete structure layer and a manufacturing method of the prefabricated concrete drainage pipe. The prefabricated concrete drain pipe comprises a corrosion-resistant concrete structure layer and a concrete pipe body, the raw materials of the corrosion-resistant concrete structure layer comprise a corrosion-resistant mortar material and fibers; the corrosion-resistant mortar material comprises cement, an active admixture, fine aggregate, an additive and water. The manufacturing method comprises the following steps: producing the corrosion-resistant concrete structure layer in advance, and then pouring the corrosion-resistant concrete structure layer and the concrete pipe body into a whole; or the corrosion-resistant concrete structure layer is poured on the inner wall of the produced concrete pipe body. The corrosion resistance of the corrosion-resistant concrete structure layer is improved by 10-100 times compared with that of a common concrete layer used by the pipe body; the material property of the corrosion-resistant concrete structure layer and the pipe body are both cement-based materials, the corrosion-resistant concrete structure layer and the pipe body material can achieve common bearing well, the separation problem caused by aging and material difference does not exist, and the excellent durability is achieved.

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 utility model discloses a post-cast mixed frame steel connecting beam column joint in the middle of a column, which comprises a precast concrete column with a column top end steel connecting piece and a first connecting end plate at the bottom of the column, and a precast concrete beam with a beam end steel connecting piece, and a post-cast hole is formed in the center of the precast concrete column; during installation, a reinforcement cage is inserted into the post-pouring hole according to the stress condition, then the column top end steel connecting piece located on the lower portion is connected with the first connecting end plate located on the upper portion through bolts, then post-pouring concrete is poured into the hole and the interior of the column top end steel connecting piece, and the column top end steel connecting piece is connected with the beam end steel connecting piece through bolts or bolt welding. According to the utility model, high-efficiency support-free splicing of precast concrete beams and columns is realized, the construction efficiency is improved, the joint adopts a concrete filled steel tube form to realize the enhancement of a core area, a plastic hinge is generated on a beam end steel connecting piece through reasonable design, and the advantages of energy consumption and deformation of a steel structure can be fully exerted.

The invention discloses a fabricated concrete industrial factory building structure, and relates to the technical field of industrial factory buildings. The assembly type concrete industrial factory building structure comprises a plurality of layers of laminates, the laminates are connected and supported through prefabricated concrete stand columns, each layer of laminate comprises a frame built through a concrete steel structure and a pavement structure laid on the top of the frame, and the frame comprises concrete cross beams, concrete longitudinal beams and concrete secondary beams. The concrete cross beams, the concrete longitudinal beams and the prefabricated concrete stand columns are perpendicularly connected through the main nodes. Concrete and I-shaped steel are combined and poured into a firmer beam column, stable installation and connection can be achieved only by using main joints and secondary joints to be matched with bolts at the connecting positions of all the parts, then a small amount of welding is conducted, more stability is achieved, the construction efficiency is high, follow-up dismantling work can be conveniently conducted, and the top surface layer is spliced through non-rib-out laminated plates, so that the construction cost is reduced. And then the concrete pavement is paved, so that the construction is relatively simple and rapid.

The invention discloses an assembly type prefabricated concrete heat preservation and sound insulation floor slab, and relates to the technical field of prefabricated floor slabs. The assembly type prefabricated concrete heat preservation and sound insulation floor slab comprises a prefabricated bottom plate, a heat preservation layer plate is arranged on one surface of the prefabricated bottom plate, first heat preservation and sound insulation plates are arranged on the heat preservation layer plate and arranged in a state with a dead zone, and a non-dead zone of each first heat preservation and sound insulation plate is used for heat preservation and sound insulation; and the panel layer is poured on the side, close to the first heat preservation and sound insulation plate, of the prefabricated bottom plate, and the panel layer can fill the goaf. The face plate layers are in contact with the heat preservation layer plates after being poured, so that the contact area between the layer plates is increased, the contact strength between the layer plates is improved, a layer plate sandwich structure is formed, direct covering type installation of heat preservation plates in the traditional sense is improved through the structure, the connection strength between the structures is improved, and the heat preservation effect is improved. And meanwhile, the heat bridge effect is blocked by utilizing the low heat conductivity of the first heat-insulating and sound-insulating plate, so that the heat-insulating and sound-insulating effects are greatly improved.

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 relates to a precast concrete sheet pile water stop structure. Grooves are formed in the splicing faces of the two sides of a sheet pile, and connecting pieces are arranged on the grooves; the connecting piece comprises a fixing part, a connecting part and water stopping parts, the two ends of the connecting part are connected with the fixing part and the water stopping parts correspondingly, the fixing part is located in the grooves and connected with the sheet pile, and the two water stopping parts on the two opposite grooves are matched with each other and form a first face and a second face which are attached to each other; the first surface is provided with at least one convex peak, and the second surface is provided with a concave valley matched with the convex peak. The prefabricated concrete sheet pile water stop structure has the following advantages that the first face and the second face are attached, it is guaranteed that the two water stop parts are tightly combined, and water seepage is prevented; compared with traditional grouting water stopping, construction is complex, cost is high, the connecting piece can be installed in advance, after the sheet piles are spliced, the first face and the second face are attached to each other, and the sheet piles are automatically pressed and closed under the back side water and soil pressure to achieve the good water stopping effect.

The invention belongs to the technical field of precast concrete component crack repairing and solid waste, and particularly relates to a precast concrete component low-carbon repairing material and a preparation method and a use method thereof. The low-carbon repairing material has good compressive strength, breaking strength and bonding strength, the 28-day dry shrinkage rate is low, and the initial setting time and the final setting time of the low-carbon repairing material are short. By adopting the low-carbon repairing material, not only can the compressive strength and breaking strength of the repaired concrete prefabricated component be improved, but also the repairing time of concrete cracks can be shortened, and the repairing efficiency of concrete can be improved.

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.