38results about How to "Reduce dismantling process" patented technology

The invention provides a support-free formwork for reserved bolt holes of a roughing mill body and a construction method. The support-free formwork comprises a reserved hole box, wherein the reservedhole box comprises a bottom sealing plate, a plurality of threaded steel pipes and a top sealing plate; the threaded steel pipes are uniformly distributed between the top sealing plate and the bottomsealing plate; the top sealing plate is provided with top sealing plate holes corresponding to the upper ends of the threaded steel pipes; the upper ends of the threaded steel pipes penetrate throughthe top sealing plate holes and are fixedly connected with the top sealing plate; the bottom sealing plate is provided with bottom sealing plate holes corresponding to the lower ends of the threaded steel pipes; and the lower ends of the threaded steel pipes penetrate through the bottom sealing plate holes and are fixedly connected with the bottom sealing plate. According to the support-free formwork, the defects of wood formwork construction are effectively overcome, the overall rigidity of the formwork is improved through the threaded steel pipes, the formwork dismounting process is reduced,time and labor are saved, the threaded steel pipes and a concrete foundation are fixedly connected into a whole for use, the quality of the reserved bolt holes is guaranteed, and meanwhile, foundation bolts can be effectively prevented from being pulled out through threads of the threaded steel pipes.

The invention relates to a frame-shear wall structure building of a dismantling-free prefabricated reinforced concrete formwork and a construction method thereof, belonging to the technical field of buildings and construction thereof. The structure is a pure frame structure building formed through connecting a dismantling-free prefabricated reinforced concrete rectangular column formwork, a beam formwork and a floor system formwork with each other by using cast-in-place concrete, or a frame-shear wall structure building formed through connecting a dismantling-free rectangular column formwork,a beam formwork, a floor system formwork and a wall formwork with each other by using cast-in-place concrete; longitudinal and transverse through holes in parallel with the surface are arranged in each formwork; one building unit of a cast-in-place concrete frame-shear wall structure is formed by alternatively arranging reinforcing steels and filling concrete in the crossed through holes; and a multistoried or high-rise cast-in-place concrete frame-shear wall structure building is formed by one building unit or more building units which are combined. The frame-shear wall structure building has the advantages of being simple for machining and less in investment of production equipment, decreasing the construction processes, accelerating the construction, saving the manpower and the like.

The invention discloses a demolition construction method for long-span highway suspension bridges. The construction method specifically comprises the following steps that 1, steel structure counter-force frames are installed at the top of a main tower, cable saddling and pushing are conducted, and the deflection of the main tower is corrected; 2, bridge surface plates and bridge surface paving layers are cut, and blocking and whole hoisting are conducted; 3, demolition of steel truss beams is conducted, and after the steel truss beams are cut off from the midspan, the beams are lowered in a segmental mode as a whole; 4, demolition of main cables are conducted, remaining main cable hangings and catwalks are utilized as an operation platform, the main cables are cut off in situ, and the demolition of the main cables is conducted; 5, demolition of the main tower is conducted, diamond wire saws are utilized to cut reinforced concrete with static force, upper cross beams are lowered as a whole through the adoption of a suspension system, after the main tower is cut and divided into blocks, vehicle cranes are used for hoisting, and cutting and hoisting are conducted after holes are drilled in lower cross beams. The demolition construction method for the long-span highway suspension bridges is applicable to the complex demolition of suspension bridges in geological environment, and the construction method is not only relatively little in resource waste and relatively low in economic cost, but also conductive to environmental protection.

The invention provides a frame-shear wall structure based on three-side-grooved strip precast concrete wallboard assembly and a construction method thereof. The structure comprises a cast-in-place spatial form system formed by mutually connecting strip precast concrete wallboards, wall column forms, shear walls and floor / roof forms; the strip precast concrete wallboards are precast with reinforced concrete, each wallboard is provided with end grooves and two side grooves, and the each wallboard can be provided with an insulation layer and a decorating layer as required; rebars are placed and concrete are poured between the wallboards or between the wallboards and wall columns, between the wallboards and the shear walls, including a cavity with side grooves, into space communicated through the end grooves, and onto the floor / roof forms, so that a single floor frame-shear wall structure building of a building unit is formed; a multi-floor building unit can be constructed by lap joint based on the single-floor building unit. The frame-shear wall structure and the construction method thereof have the advantages that manufacturing is simple, investment on production equipment is low, construction steps are fewer, construction speed is higher and less labor is required.

The invention provides a slab column-shear wall structure building based on precast reinforced concrete hollow formworks and a construction method thereof. The building comprises a cast-in-place space formwork system which is formed through the interconnection of hollow column formworks, wall formworks and floor / roof formworks, wherein each hollow column formwork is made of reinforced concrete in a precasting way and provided with at least one longitudinally-penetrating hollow channel; through the interspersion of reinforcements and the filling of concrete in the intercommunicated hollow channels of the hollow column formworks and the wall formworks and the laying of the reinforcements and the pouring of the concrete onto each floor / roof formwork, a single storey slab column-shear wall structure building which can be a one-storey building unit or a single-storey building is formed; and next, based on the one-storey building unit, a multistorey building unit can be formed in a lap joint way. The slab column-shear wall structure building based on the precast reinforced concrete hollow formworks and the construction method thereof provided by the invention have the advantages of simplicity in workpiece processing, low production equipment investment, fewer installation procedures, high construction speed, lower labor cost and the like.

The present invention relates to a construction method for dismantling a cable crane, specifically a construction method for dismantling a large-span cable crane adjacent to a railway business line, which solves the technical problems in the background technology. The working rope 10 is dismantled step by step, and then the part above 100m of the super high-rise tower is dismantled by the shaking head 14; The whole floor is demolished. The present invention is specially aimed at dismantling large-span cable cranes on railway business lines with tight construction schedule and poor working environment. The super high-rise tower system is divided into three parts for dismantling. The demolition of parts is gradually adjusted to the demolition of the whole floor, which improves work efficiency and transfers a large number of high-altitude operations to the ground, which minimizes safety risks, reduces railway blockade points, and ensures the safety of railway operation lines.

The invention provides a frame structure based on three-side-grooved strip precast concrete wallboard assembly and a construction method thereof. The frame structure comprises a cast-in-place spatial form system formed by mutually connecting strip precast concrete wallboards, wall column forms and floor / roof forms; the strip precast concrete wallboards are precast with reinforced concrete, each wallboard is provided with end grooves and two side grooves, and each wallboard can be provided with an insulation layer and a decorating layer as required; rebars are placed and concrete is poured between the wallboards or between the wallboards and wall columns, including a cavity with side groove, into space communicated through the end grooves, and onto the floor / roof forms, so that a single-floor frame structure building of a building unit is formed; a multi-floor building unit can be constructed by lap joint based on the single-floor building unit. The frame structure and the construction method thereof have the advantages that manufacturing is simple, investment on production equipment is low, construction steps are fewer, construction speed is higher and less labor is required.

The invention discloses a super-large-diameter overall movable metal formwork for a shaft, which includes a standard formwork, a lifting drive device, a deformation-preventing pre-embedded pressing mechanism and a demoulding mechanism. The anti-deformation pre-embedded pressing mechanism is installed on the standard formwork and the anti-deformation pre-embedded pressing mechanism is used to press the suspension ear plate of the formwork, and the demoulding mechanism is installed between two adjacent standard formworks. And the two adjacent standard formworks are demoulded or supported to open the mold under the action of the demoulding mechanism. This application can realize the synchronous lifting and lowering of the formwork by the lifting drive device or multiple ground stabilizer (winch) steel wire rope lifting points, and enhance the overall rigidity of the formwork and the ability to resist local deformation through the anti-deformation pressing device. It becomes smaller or larger within the elastic range, and can quickly complete the demoulding, lowering (or raising), vertical formwork pouring and other processes, saving the time for masonry well walls.

The invention discloses a construction method for a small-section vertical shaft without form removal. A plurality of annular thin-wall concrete internal molds of the certain length are manufactured in advance, and the construction method for the small-section vertical shaft without form removal comprises the following steps that S1, during next-layer large-size concrete pouring, the position of the vertical shaft is determined, and an internal mold positioning reinforcing piece is pre-embedded; S2, according to the current-layer large-size concrete pouring thickness, the pre-manufactured annular thin wall concrete internal mold of the corresponding length is selected and lifted to the position of the vertical shaft, the internal mold positioning reinforcing piece is used for positioning,and reinforcing is performed; S3, current-layer large-size concrete is poured, and the internal mold positioning reinforcing piece of the vertical shaft of the last layer is pre-embedded; S4, steps S2and S3 are repeatedly executed till vertical shaft construction is completed. The method has the advantages that no mold removal is performed inside the vertical shaft with the small space, the formremoval procedure is omitted, and the construction progress is greatly accelerated.

The invention discloses a complete set of mechanical equipment for tunnels, specifically referring to excavation trolley (or excavation platform), waterproof and drainage and steel bar binding trolley, lining trolley, spraying maintenance trolley, ditch cable trough trolley , Inverted arch self-propelled hydraulic trestle, wet spray manipulator, referred to as five vehicles, one trestle, and one wet spray machine; the construction organization method adopted with the complete set of mechanical equipment includes the following construction organization methods: S1: cave body excavation; S2: Primary support; S3: Inverted arch lining; S4: Arch wall lining; S5: Ditch cable trough; the complete set of mechanical equipment. The construction organization method of the present invention is reasonable, effectively improves the tunnel management effect, improves the construction operation environment, ensures the construction safety and quality, and improves the construction progress; it is worthy of vigorous promotion.

The invention discloses a construction process of a prefabricated bridge deck wet joint connection structure. Firstly, welding studs, steel plates and reinforcement rings are combined into an integral structure, and then the welding studs are connected with a bridge deck, so that the steel plate has the welding stud side and the steel bar suspension ring. The bottom surface of the concrete slab is attached, epoxy mortar is laid on the other side of the steel plate, the steel plate is attached to the bottom surface of the other bridge deck, and finally the overall structure is exposed through the steel bars and the ends of the bridge deck on both sides by welding or binding. The pre-embedded steel bars are connected to combine the two adjacent bridge decks with the wet joint connection structure of the prefabricated bridge decks into a whole, and the bottom of the wet joint between the two adjacent bridge decks is completely sealed by the steel plate. Compared with the prior art, the present invention reduces the process of formwork installation and removal during the wet joint construction of the traditional prefabricated bridge deck on site, speeds up the construction speed, ensures the connection quality of the wet joint, and improves the quality of the wet joint. The bearing capacity of the structure increases the safety reserve of the structure.