2724 results about "Hollow core" patented technology

A building module for use in construction of a building comprising a deck oriented in a horizontal plane and a plurality of hollow structural members extending downwardly from around a periphery of the deck. A method of constructing a building comprising placing a plurality of modules according to a floor plan to form a story of the building, pouring flowable medium that sets to a become a solid structural material into the hollow structural members of the plurality of modules to form structural columns, pouring flowable medium that sets to a become a solid structural material onto the decks of the plurality of modules for form structural slabs, and allowing the structural columns and structural slabs to set to complete the story of the building.

The invention discloses a visual data-based automatic finite element modeling and performance evaluation method for an existing damaged hollow slab girder bridge. The method comprises the steps of S1, acquiring complete three-dimensional point cloud data of a multi-beam-slab model; s2, based on the three-dimensional point cloud data, extracting key geometric features of the structure by adopting a structure three-dimensional size automatic measurement method fusing plane projection and point cloud distortion correction; s3, for the damaged area of the multi-beam-slab structure, identifying the boundary of the damaged area and the non-damaged area of the multi-beam-slab structure through a point cloud neighborhood point height difference comparison and clustering analysis method, and carrying out detailed spatial position analysis on the damage; and S4, a damage unit set is automatically retrieved in combination with damage positioning quantitative information, and automatic updating of hinge joint damage of the multi-beam-slab structure is achieved through a life-death unit method failure damage area finite element grid. According to the method, automatic finite element modeling and evaluation of the existing hinge joint damage multi-beam-slab structure are achieved, and an efficient and accurate technical means is provided for health monitoring and performance evaluation of a bridge structure.

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention discloses a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

The invention discloses a hollow slab girder bridge maintenance decision-oriented hierarchical knowledge graph construction method, which comprises the following steps of: constructing a hollow slab girder bridge disease classification and maintenance decision general knowledge graph, combing disease types and evaluation indexes of a hollow slab girder bridge through cross-standard feature alignment and rule fusion, and defining each disease and the index thereof in a variable manner so as to construct a hollow slab girder bridge disease classification and maintenance decision-oriented hierarchical knowledge graph. The weight of each disease index is determined based on a fuzzy-Bayesian hybrid reasoning algorithm, and a complete general knowledge graph structure is formed; extracting disease information based on a detection report of a single bridge, endowing each disease with a maintenance suggestion by using a general knowledge graph, and forming a maintenance decision knowledge graph special for the bridge; and dynamically updating the special knowledge graph, and adjusting disease information and maintenance suggestions according to a subsequent detection report of the bridge to ensure timeliness and accuracy of the graph. According to the method, the problems that knowledge is dispersed and systematization is difficult in traditional hollow slab girder bridge maintenance decision making are solved, and scientificity and efficiency of bridge maintenance management are improved.

The current invention relates to a flush-mounted module, comprising a housing and a socket, the housing comprising a hollow body with a front wall, back wall and one or more side walls, a flange extending away from the body, at least one clamp for clamping the flush-mounted module, and a clamp screw through each of the at least one clamps, where the socket is attached behind the front wall, wherein after perpendicular projection onto the plane formed by the front wall, a center point of the clamp screw lies within a smallest possible polygon around an enveloping outline of a smallest possible insulation surface around contact points of the socket, wherein an enveloping outline is a smallest possible circle in the plane formed by the front wall around the smallest possible insulation surface. The invention also relates to a method and a use.

An anti-resonant hollow core optical fiber preform that includes an outer cladding, a plurality of structural tubes, and a central support tube. The outer cladding has a length, a central longitudinal axis, and a hollow interior. The plurality of structural tubes are disposed within the hollow interior of the outer cladding, the plurality of structural tubes each having a length that extends the length of the outer cladding. And the central support tube is disposed within the hollow interior of the outer cladding such that the plurality of structural tubes are disposed radially outward of the central support tube, the central support tube having a length that extends along the central longitudinal axis of the outer cladding. Furthermore, the length of the central support tube is less than the length of the outer cladding.

The invention provides a hollow slab internal mold construction system, and relates to the technical field of building construction. A first construction result acquisition module; the initial construction parameter optimization module is used for scanning the first construction result through a laser scanner, analyzing and determining first concrete compactness deviation and first construction deviation, optimizing initial construction parameters and determining first optimal construction parameters; and the construction operation module is used for executing the construction operation of the second pouring interval according to the first optimal construction parameters until the preset construction period is completed. By means of the method, the technical problems that in an existing method, due to the fact that accuracy and timeliness of construction parameter regulation and control are insufficient, overall construction errors are seriously accumulated, and overall construction quality is affected can be solved, pouring parameters and vibration parameters can be rapidly and accurately adjusted, construction management and control fineness and intelligence are improved, and construction efficiency is improved. Therefore, the problem of construction regulation lag is effectively solved, and the construction precision and the construction quality are remarkably improved.

The utility model relates to the field of pile foundations, in particular to an uplift precast pile structure which comprises a precast hollow pile and an anchoring device, the anchoring device is connected with the precast hollow pile, a plurality of unbonded prestressed steel strands are arranged in the precast hollow pile, and the anchoring device comprises a pile bottom anchoring part and a pile top anchoring part. The anti-pulling precast pile solves the problem that an anti-pulling precast pile in the prior art cannot be used as a long pile or an ultra-long pile, improves the anti-pulling bearing capacity of a single pile, improves the stress performance of the anti-pulling pile, and enables the anti-pulling pile to have better integrity and anti-pulling ductility.

The invention discloses a foundation pit gas film foundation and a construction method thereof.The foundation pit gas film foundation comprises H-shaped steel which is sequentially connected end to end, the H-shaped steel is composed of an upper flange plate, a lower flange plate and a web, one end of the web is connected with the upper flange plate, the other end of the web is connected with the lower flange plate making contact with the ground, and the lower flange plate is provided with an open hole and a fixing mechanism; the foundation pit air film foundation further comprises spiral ground piles penetrating through the open holes and extending into the ground. The fixing mechanism is used for limiting the spiral ground pile; a connecting mechanism connected with a gas film material is arranged on the upper flange plate; the spiral ground pile is of a hollow structure, and a buffering mechanism and a reinforcing mechanism are arranged in the spiral ground pile. When the H-shaped steel is subjected to drawing force, the fixing mechanism is driven to trigger the buffering mechanism to counteract the drawing force, and meanwhile the reinforcing mechanism is triggered to increase the underground shearing force of the spiral ground pile. The problems that when an existing foundation pit air film foundation is used in coastal areas, the foundation is unstable and an air film is turned over due to low soil bearing capacity and strong wind cannot be handled are solved.

The invention relates to the technical field of building pipe piles, in particular to an improved precast pile in a collapsible loess area and a construction technology, the improved precast pile comprises a hollow steel pipe pile, and a receding hole is formed in the hollow steel pipe pile; the at least one guide insertion strip is rotationally connected with the hollow steel pipe pile, the rotating plane of the guide insertion strip is vertically arranged, the guide insertion strip extends into an inner cavity of the hollow steel pipe pile through the receding hole to form a linkage strip, the guide insertion strip and the linkage strip are both arranged in a hollow mode, and a plurality of grout outlets are formed in the guide insertion strip; an inner cavity of the hollow steel pipe pile communicates with the grout outlet through an inner cavity of the linkage strip. The rotation driving unit is movably arranged in an inner cavity of the hollow steel pipe pile, and the rotation driving unit is matched with the linkage strip to drive the guide insertion strip to rotate; the precast pile has the effects that the strengthening effect of the under-pressure concrete on the soil body around the precast pile is improved, and then the settlement amount of the precast pile is reduced when collapsible settlement occurs in the soil body.

The invention belongs to the technical field of concrete, and particularly discloses an aerated concrete block and a preparation method thereof. The aerated concrete block is prepared from the following raw materials in parts by weight: 70 to 80 parts of water, 25 to 30 parts of Portland cement, 30 to 35 parts of sand, 3 to 5 parts of aluminum powder, 1 to 3 parts of polycarboxylate superplasticizer, 7 to 9 parts of lime, 10 to 15 parts of modified waste rubber powder, 10 to 12 parts of hollow glass beads and 12 to 16 parts of modified polystyrene fiber. The aerated concrete block prepared in the invention has good strength, compactness and tensile strength, and the strength, durability and stability of the aerated concrete block are improved.

The invention provides a composite protection structure suitable for underwater seepage prevention and explosion prevention of a concrete gravity dam and a preparation and construction method, and belongs to the technical field of engineering explosion prevention and seepage prevention. The composite protection structure comprises a reinforced concrete slab anchored on the outer surface of the gravity dam by a certain distance through an anchor rod; a reserved interlayer between the reinforced concrete slab and the outer surface of the gravity dam is filled to form an anti-seepage and anti-explosion composite layer; the anti-seepage and anti-explosion composite layer is formed by pouring hollow glass bead-asphalt concrete, and the hollow glass bead-asphalt concrete is prepared from asphalt concrete with modified hollow glass beads as filler; the modified hollow glass beads account for more than 15% of the asphalt concrete by volume, and the asphalt concrete has enough sealing gas for reflecting explosive shock waves and has the characteristics of seepage prevention and energy dissipation. The composite protection structure has anti-seepage and anti-explosion functions, the service life of the dam is prolonged, and the ability of the dam to resist sudden extreme working conditions is improved.

The invention provides a hollow slab bridge disease time sequence prediction method and system based on machine learning, and is applied to the technical field of bridge disease analysis and prediction.The method comprises the steps that hollow slab bridge detection data is acquired, and an original data set is constructed according to the disease data; performing structured preprocessing on the original data; feature engineering is carried out on the structured data, random forest screening is utilized, feature correlation analysis is carried out, and a low-redundancy high-correlation feature set is obtained; dividing the bridge detection data corresponding to the low-redundancy high-correlation features into training samples according to a time sliding window, and constructing a time sequence sample set; and carrying out model training and optimization, training a time sequence sample, and predicting continuous values of future diseases. According to the method, the accuracy, precision and stability of bridge disease prediction are improved through data acquisition, preprocessing, feature optimization, model establishment and output of the dynamic change prediction result of the disease continuous index, the efficiency is higher, and the method has a good application prospect.

The invention belongs to the technical field of vibrating devices, and particularly relates to a vibrating device for large-volume concrete pouring construction of a fan foundation, the vibrating device comprises a vibrator, and one end of the vibrator is electrically connected with a vibrating rod through a connecting wire; a scraping mechanism is arranged on the surface of the vibrating rod, the scraping mechanism comprises a lantern ring fixedly connected to the surface of the vibrating rod in a sleeving mode, the interior of the lantern ring is hollow, an electric push rod is fixedly installed in the lantern ring, and a connecting rod is fixedly installed at the output end of the electric push rod; through reciprocating operation, concrete adhered to the surface of the vibrating rod can be quickly cleaned, so that the situation that the concrete on the surface of the vibrating rod is hardened and solidified, and subsequent cleaning is difficult is effectively avoided. And meanwhile, workers do not need to clean, so that the workload of the workers is reduced, and efficient cleaning operation can be achieved.

The invention relates to the technical field of water conservancy projects, in particular to a cofferdam for ship lock transformation and a construction method. A cofferdam for ship lock transformation comprises concrete cofferdam bodies and hollow concrete supporting structures, the concrete cofferdam bodies are tightly attached to the wall faces on the two sides of a ship lock and extend in the water flow direction, and the hollow concrete supporting structures are arranged between every two adjacent concrete cofferdam bodies. The hollow concrete supporting structure is fixedly connected with the concrete cofferdam body through a connecting device, the hollow concrete supporting structure comprises a bottom layer, a hollow layer and a top layer, a plurality of rows of cavities arranged side by side are formed in the hollow layer, and blasting devices are pre-buried in the concrete wall between every two adjacent cavities at equal intervals. The concrete cofferdam body is tightly attached to the wall face of the ship lock, a stable water retaining barrier can be formed, the self weight can be reduced through the design of the hollow layer, and compared with traditional mechanical or manual dismantling, efficient and controllable dismantling can be achieved through the blasting device embedded in the supporting structure, and the construction period can be greatly shortened.

The invention discloses an assembly type multi-layer lightweight concrete sandwich wallboard structure system, which relates to an assembly type multi-layer building and comprises lightweight concrete sandwich prefabricated wallboards, vertical corner prefabricated members and fully prefabricated hollow floor slabs, the lightweight concrete sandwich prefabricated wall panel and the vertical corner prefabricated part are connected in an anchoring mode through a vertical anchoring connecting section, a prefabricated bracket is arranged on one side of the lightweight concrete sandwich prefabricated wall panel, and the full-prefabricated hollow floor slab is arranged on the prefabricated bracket. The fully-prefabricated hollow floor slabs and the lightweight concrete sandwich prefabricated wallboards are anchored and connected through the horizontal cast-in-place sections of the fully-prefabricated hollow floor slabs, and every two adjacent layers of lightweight concrete sandwich prefabricated wallboards and vertical corner prefabricated parts are fixedly clamped through buckle type connecting parts. The invention further discloses a construction method of the fabricated multi-layer lightweight concrete sandwich wallboard structure system. Connection joints are simple and convenient, grouting connection is not needed, the prefabricated horizontal members do not need temporary supports, the on-site pouring amount is small, and the stress performance is good.

The invention discloses a stair energy consumption ship collision prevention system based on a metamaterial structure, which comprises an ultra-high performance concrete panel, a stair energy consumption collision prevention layer, a rubber fender, a bridge pier, a bridge bearing platform and a bridge pile foundation, and the stair energy consumption collision prevention layer comprises a variable rigidity unit, a light energy consumption material, a vertical steel plate, an upper top plate and a lower bottom plate, the variable rigidity unit is formed by connecting a plurality of concave hexagonal units through transverse and longitudinal steel plates, and the middle hollow structure is filled with light energy dissipation materials capable of absorbing and dispersing impact energy, such as polyurethane foam, ceramsite and rubber particles. The variable rigidity unit and the steel plates are welded into a whole, and the protection device and the protected pier are connected through a rubber fender. The overall rigidity of the protection device can be increased along with structural deformation when the protection device is impacted, so that the variable-rigidity cascade energy dissipation anti-collision effect is achieved, the ship and bridge collision time can be effectively prolonged, the ship collision force can be effectively reduced, and bidirectional protection of the ship and the bridge is achieved.

The invention relates to the technical field of hoisting, in particular to hoisting equipment for intelligent constructional engineering, a lifting electric cylinder is fixedly connected to the top of a balance supporting plate, mounting boxes are fixedly connected to the top of the lifting electric cylinder, a fixed top box is fixedly connected between the two mounting boxes, and a mounting top plate is fixedly connected to the bottom of the fixed top box; a fixing side plate is fixedly connected to the bottom of the mounting top plate, a fixing rotating shaft is rotatably connected to the bottom of the fixing side plate, connecting plates are rotatably connected to the two ends of the fixing rotating shaft, a hollow groove plate is fixedly connected to one side of the fixing side plate, and an adjusting sliding shaft is slidably clamped to the inner side of the hollow groove plate. The lifting device is simple in structure and particularly suitable for indoor narrow space and high-precision working environment, the lifting efficiency and the working safety can be remarkably improved, intelligent and automatic operation of the lifting device is achieved by adopting an advanced mechanical structure and a control technology, and manual intervention is reduced.

The invention discloses a lightweight concrete safety energy storage cabinet and a preparation method thereof, and the lightweight concrete safety energy storage cabinet is obtained by injecting lightweight concrete into a mold and performing steam curing; the lightweight concrete is prepared from the following raw materials in parts by weight: 20 to 40 parts of cement, 8 to 20 parts of silica fume, 8 to 25 parts of slag powder, 0 to 10 parts of fine sand, 15 to 35 parts of lightweight fine ceramsite sand, 0 to 21 parts of coarse ceramsite sand with the particle size of 5 to 10 mm, 0 to 3 parts of steel fiber, 0 to 1.5 parts of PP fiber, 0.5 to 2.0 parts of polycarboxylic acid type water reducing agent, 0 to 14 parts of hollow glass beads, 0.1 to 0.5 part of release agent and water. Wherein the water-binder ratio is 0.15 to 0.22; the use amounts of the steel fibers and the PP fibers are not 0 at the same time; the light ceramsite sand and the coarse ceramsite sand are subjected to pre-wetting treatment before being used; the fireproof, explosion-proof and heat-insulating material has the characteristics of light weight, safety and impermeability, and has excellent fireproof, explosion-proof and heat-insulating properties.

The invention discloses a self-repairing waste felt-based carbon fiber electromagnetic shielding concrete structure and a design method, and relates to the field of protective engineering building materials and multifunctional concrete structural design, the self-repairing waste felt-based carbon fiber electromagnetic shielding concrete structure comprises a base material, waste felt-based carbon fibers, hollow glass microsphere cell bodies and a synergistic enhancement mechanism, the base material comprises cement, silica fume, quartz sand and a high-efficiency water reducing agent, the waste felt-based carbon fibers are crushed to the particle size of 50-100 meshes, the crushed waste felt-based carbon fibers are modified by a specific silane coupling agent and then are uniformly dispersed in the ultra-high performance concrete base, graphene or carbon nanotube conductive particles are combined and doped, and the ultra-high performance concrete is prepared. A continuous three-dimensional conductive network is formed, the electromagnetic shielding effectiveness in the wide frequency band of 1-40 GHz reaches 30 dB or above, compared with a traditional metal shielding layer, the weight is reduced by 60%, the cost is reduced by 50%, and meanwhile the problem of metal corrosion is avoided.

The invention discloses large open type karst cave local rock forming equipment and method, and belongs to the technical field of karst area pile foundation construction. The problems that in traditional cloth bag pile construction, the hole collapse risk is high, the bearing capacity is insufficient, and grouting displacement of a steel reinforcement framework occurs are mainly solved. According to the equipment, grout overflow holes distributed in a staggered mode are preset in a variable-diameter hollow steel cylinder body, and a grout overflow groove is formed in the variable-diameter part of the cylinder bottom; the diameter of the upper part of the coarse structure is larger than that of the lower part of the coarse structure; the steel sleeve is anchored at the top of the steel cylinder and has larger diameter; the cylindrical plastic sleeve is adhered to the inner wall of the steel cylinder; the grouting pipe is arranged in the cylindrical plastic sleeve in a penetrating manner; and the annular hoop surrounds the outer side of the fiber bag through the plastic short pipe to form a bamboo-shaped constraint structure. The upper end of the fiber bag is anchored to the steel sleeve, and the lower end of the fiber bag is anchored to an anchor hole in the bottom of the steel cylinder. The equipment is used for large open type karst cave pile foundation construction, the hole collapse resistance is improved through a composite structure of the steel cylinder and the fiber bag, the bearing capacity is increased, and grouting displacement is prevented.

The invention provides a prefabricated hollow pile foundation and a high-pressure grouting method thereof. The prefabricated hollow pile foundation comprises a flexible bag, a steel pile tip and a connecting plate, and the top of the flexible bag is connected with the bottom of a prefabricated hollow pile through the connecting plate; a grouting port valve port in the middle of the connecting plate is connected with a grouting pipe in the prefabricated hollow pile; and a steel pile tip is mounted at the bottom of the flexible bag. After pile sinking, through high-pressure grouting, the flexible bag expands and extrudes a soil body at the pile end, the pile end is expanded, meanwhile, a soil layer at the pile end is compacted, the bearing capacity of the pile end is greatly improved, pile settlement is reduced, meanwhile, the grouting amount is controllable, and the bearing capacity of the pile is controllable.

The utility model discloses a combined hollow floor support plate. The combined hollow floor support plate comprises a bottom plate, a box body and a connecting piece, the length of the bottom plate is the span of the floor system, and the width is multiple of a plurality of box bodies; the plurality of box bodies are longitudinally arranged and fixed at intervals on the bottom plate; the box bodies are connected through connecting pieces in the longitudinal direction. And the three components form a combined hollow floor support plate for bearing during floor system construction, and also serve as a template of post-pouring concrete and a bottom surface protection layer of the post-pouring concrete. A plurality of hollow floor bearing plates are transversely and closely spliced and fully paved on floor cover plate spans, gaps among the box bodies are paved with steel bars, concrete is poured later to form bidirectional floor cover ribbed beams, concrete is poured later on the top surfaces of the box bodies to form inter-rib panels, and the building floor cover meeting the using function bearing requirement is formed. The utility model is suitable for medium and large span floor systems, has the advantages of simple manufacture, low cost, no formwork and support, fast and convenient construction, light floor system dead weight, complete bidirectional stress, excellent mechanical property and the like, and meets the key index of'double saving 'of steel bar consumption and concrete consumption compared with the traditional cast-in-place beam slab floor system.

The utility model relates to the technical field of bridge reinforcement, and discloses a bridge hollow slab girder reinforcement structure and a bridge, which comprises a plurality of hollow slab girders arranged side by side, a plurality of webs are arranged in each hollow slab girder, the bottom surface of each hollow slab girder is provided with longitudinal reinforcers, the number of the longitudinal reinforcers is equal to that of the webs, and the longitudinal reinforcers are in one-to-one correspondence with the webs. The longitudinal reinforcements are arranged in the longitudinal direction of the bridge and comprise upper-layer sticky steel plates and lower-layer sticky steel plates, and the upper-layer sticky steel plates are located between the hollow slab girders and the lower-layer sticky steel plates; the transverse reinforcements are arranged in the transverse direction of the bridge, and all the longitudinal reinforcements are located between the transverse reinforcements and the hollow slab girders. According to the utility model, the problem that a bridge with high requirement on the strength of a reinforcing structure cannot be stably reinforced by a sticky steel plate reinforcing structure in the prior art is solved.

A steel-structure building envelope includes a building body, floor slabs, and external walls. The building body has H beams and decks. The decks are assembled onto the H beams. The floor slabs have RC slabs laid on the decks. The external walls each have an RC curb formed on the RC slab by means of casting, two steel C profiles, one of which is installed on the RC curb with an opening thereof facing upward, and the other of which is mounted on the deck with an opening thereof facing downward; and an outer wall panel and an inner wall panel, attached to opposite sides of the RC curb and the two steel C profiles, respectively, so that a hollow space is formed between the outer wall panel and the inner wall panel. Thereby the external walls have a two-layer structure and are affixed directly to the floor slabs.

According to the hollow concrete pile core mold tensioning structure, a pouring core mold is supported by a tensioning framework, the outer side of the tensioning framework is wrapped with an elastic skin, the elastic skin forms a hollow structure during concrete pouring through circumferential stretching or stretching of the tensioning framework, and the hollow structure is pulled out of a center hole after forming; and pouring forming of the hollow concrete pile is completed, the tensioning framework supports the elastic skin in an attached mode through the multiple inner supporting plates, the inner supporting plates are supported in the radial direction through the jacking structure, and in the process, expansionary force and supporting force of the elastic skin are provided. The pouring core mold is in tensioning fit with the tensioning plate set through the tensioning rod, the tensioning rod is connected with the tensioning adjusting device, the tensioning adjusting device can tighten or loosen the jacking structure, the inner supporting plate is supported or recycled by the jacking structure, and forming of the hollow structure of the hollow concrete pile through the elastic skin is completed. The invention further provides a hollow concrete pile tensioning die.

The steel bar truss prefabricated part comprises a bottom plate and a plurality of steel bar trusses arranged above the bottom plate, and the steel bar trusses are connected with the bottom plate and distributed at intervals. A plurality of core molds which are distributed at intervals are arranged between the adjacent steel bar trusses; the first plate bottom steel bars are arranged above the bottom plate in parallel and are distributed at intervals, and gaps are formed between the first plate bottom steel bars and the bottom surfaces of the bottom plate and the core mold. The prefabricated part is high in integration degree, light in self-weight, convenient to produce in an automatic factory, small in consumption of reinforcing steel bars and concrete, light in self-weight, good in heat preservation and sound insulation effect, convenient to construct and better in economical efficiency, and a floor slab structure formed after concrete is poured is small in consumption of the reinforcing steel bars and the concrete.

The present invention relates to the technical field of water conservancy engineering, and specifically to a cofferdam for ship lock reconstruction and a construction method. A cofferdam for ship lock reconstruction comprises a concrete cofferdam body and a hollow concrete support structure. The concrete cofferdam body is closely attached to the walls on both sides of the ship lock and extends along the direction of water flow. The hollow concrete support structure is arranged between two adjacent concrete cofferdam bodies. The hollow concrete support structure is fixedly connected to the concrete cofferdam body by a connecting device. The hollow concrete support structure comprises a bottom layer, a hollow layer, and a top layer. Multiple rows of cavities arranged in parallel are formed inside the hollow layer. Blasting devices are equidistantly embedded in the concrete wall between two adjacent cavities. This application forms a stable water retaining barrier by placing the concrete cofferdam body close to the ship lock wall. The hollow layer design can reduce its own weight. In addition, the blasting device embedded in the support structure can achieve efficient and controllable demolition compared to traditional mechanical or manual demolition, which can greatly shorten the construction period.