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CN-121992910-A - Support-free and mold-free prestressed multi-ribbed hollow superposed floor and construction method thereof

CN121992910ACN 121992910 ACN121992910 ACN 121992910ACN-121992910-A

Abstract

The invention provides a support-free mould-free prestress rib hollow superposed floor system and a construction method thereof, which solve the problems of complex formwork support, single joint, poor node adaptability and insufficient durability in the prior art. The floor system comprises a prefabricated multi-ribbed hollow module, prestressed tendons, a cast-in-situ lamination layer, double-type beam column joints and five span joint structures, wherein the support-free and mould-free structure is realized through a reinforcing mould box and a support pad, and the drainage structure is optimized and durable. The construction method is implemented according to the procedures of prefabrication, assembly, joint/node treatment, tensioning and pouring of the laminated layers. The scheme is adaptive to multiple scenes, shortens construction period, reduces dead weight, improves structural integrity and industrial construction efficiency, and gives consideration to bearing capacity and space utilization rate.

Inventors

  • ZENG SHENG

Assignees

  • 曾盛

Dates

Publication Date
20260508
Application Date
20260213

Claims (10)

  1. 1. A support-free mould-free prestressed rib hollow laminated floor is characterized by comprising a prefabricated rib hollow module, prestressed ribs, a cast-in-situ laminated layer, beam column joints and a span joint structure, wherein the prefabricated rib hollow module is provided with a reinforcing mould box which is used for replacing a traditional template to form a pouring cavity, the bottom of the prefabricated rib hollow module is temporarily supported through a support pad which replaces a full scaffold to realize support-free construction, the prestressed ribs are arranged in a reserved channel of the prefabricated rib hollow module in a penetrating mode, the cast-in-situ laminated layer is poured above the prefabricated rib hollow module and forms an integral stress structure with the module, and the beam column joints are divided into two structural forms of a cap joint with a column and a cap joint without a column, and the span joint structure is used for splicing connection of adjacent prefabricated rib hollow modules.
  2. 2. The bracing-free and mold-free prestressed multi-ribbed hollow composite floor system of claim 1, wherein said span joint is constructed as any one of cast-in-place micro-expansive concrete tight joints, bolt-and-nut tight joints, wedge-shaped cement block tight joints, welded steel plate rigid joints.
  3. 3. The stay-free, mold-free, prestressed, multi-ribbed hollow composite floor system of claim 2, wherein the bolt-and-nut tightening joint is any one of a bolt-withdrawal tightening joint or a bolt-tightening joint.
  4. 4. The support-free and mold-free prestressed multi-ribbed hollow laminated floor system of claim 1, wherein the non-column cap joint comprises a steel structure bracket, a prefabricated laminated beam and a cast-in-place joint area, wherein the steel structure bracket is pre-embedded at the side of a frame column, the prefabricated laminated beam is arranged on the steel structure bracket, and the cast-in-place joint area is cast at the joint of the prefabricated laminated beam and the frame column to form rigid connection.
  5. 5. The support-free and mold-free prestressed multi-ribbed hollow composite floor system of claim 1, wherein the cap-bearing nodes comprise caps, solid area support plates and multiple reinforcement bars, wherein the caps are arranged at the tops of frame columns, the solid area support plates are laid in the prefabricated multi-ribbed hollow module areas around the caps, and the multiple reinforcement bars comprise cap tie-in bars, horizontal annular bars and plate reinforcing bars.
  6. 6. The stay-free, mold-free prestressed, multi-ribbed hollow laminate floor of claim 1, wherein the reinforcement cage is provided with a drain structure including a drain slope and a floor drain hole that extends through the floor of the prefabricated multi-ribbed hollow module.
  7. 7. The support-free and mold-free prestressed multi-ribbed hollow composite floor system of claim 1, wherein the prefabricated multi-ribbed hollow modules are arranged in a standard modular manner of 1290mm, and splicing gaps of 10mm-20mm are reserved at the edges of the modules.
  8. 8. A construction method of a support-free mould-free prestressed rib hollow laminated floor, which is characterized by being used for manufacturing the support-free mould-free prestressed rib hollow laminated floor as claimed in any one of claims 1 to 7, and comprising the following steps: S1, prefabricating a multi-ribbed hollow module in a factory, and reserving a prestressed rib channel and a splicing structure in the module; S2, hoisting the prefabricated multi-ribbed hollow module on site, temporarily supporting the module through a support pad, and installing a reinforcing mould box outside the module to form a pouring cavity; S3, splicing adjacent prefabricated multi-ribbed hollow modules is completed by adopting a midspan joint structure, and meanwhile, binding and sealing of reinforcing steel bars of beam column joints are completed; s4, pouring cast-in-place concrete of the beam column joint area and the span joint, and tensioning the prestressed tendons and finishing anchoring after the strength of the concrete reaches the design requirement; S5, pouring an upper cast-in-situ lamination layer, and sealing and protecting the joints and seams to finish the construction of the floor.
  9. 9. The construction method of the support-free and mold-free prestressed multi-ribbed hollow laminated floor system according to claim 8, wherein in the step S3, when the beam column joint is a joint without a column cap, steel structure brackets are pre-embedded on the side of a frame column, and then the prefabricated laminated beam is built on the steel structure brackets to complete steel bar anchoring; Or in the step S3, when the beam column node adopts a node with a column cap, the column cap multiple reinforcement is bound firstly, a solid area supporting plate is paved, and then the splicing of the prefabricated multi-ribbed hollow module is completed.
  10. 10. The construction method of the support-free and mold-free prestressed rib hollow laminated floor system according to claim 8, wherein in the step S4, after the prestressed reinforcement is stretched, grouting and plugging are performed on the stretching end of the prestressed reinforcement, and drainage treatment of the stretching end is completed through a bottom plate drain hole.

Description

Support-free and mold-free prestressed multi-ribbed hollow superposed floor and construction method thereof Technical Field The invention belongs to the technical field of constructional engineering, and particularly relates to a support-free and mold-free prestressed multi-ribbed hollow superposed floor and a construction method thereof. Background Along with the rapid development of building industrialization, the prefabricated building cover has become an industry development trend due to the advantages of high construction efficiency, green environmental protection and the like. Dense rib floors, prestressed floors and hollow superposed floors are the main stream forms of current large-span floors, but the prior art has a plurality of defects: The traditional cast-in-situ/prefabricated dense rib building cover is characterized in that a full scaffold and a large number of wood forms/steel forms are required to be erected, the working procedures of formwork supporting and removing are complicated, the wet working amount is large, the construction period is long, the cost of manpower and materials is high, the splicing integrity of dense rib modules is poor, and the midspan joint is easy to crack; The prestress rib floor can realize large span of 8-24 m, but most of the prestress rib floor needs to be erected with a supporting system, support-free construction cannot be realized, the prestress tension end is easy to accumulate water and rust, the durability is poor, the beam column joints are designed by adopting the traditional column caps, the building is occupied with clear height, and the space utilization rate is low; The hollow superposed floor system has the advantages that the dead weight is lighter, the connecting form of the span joint is single, the conventional construction scene can be only adapted, and the differentiated requirements of precision, cost and efficiency can not be met; The prior art does not form a systematic solution, and the combination of 'support-free and mould-free, prestress dense ribs, hollow superposition, differential joints, adaptive beam column joints and durability structures' is not realized, so that the comprehensive requirements of large span, industrialized construction, high bearing capacity, high durability and space optimization can not be met at the same time. Therefore, research and development of a prestressed multi-ribbed hollow superposed floor system which truly realizes support-free and mould-free, is adaptive to multiple scenes, has large span and high durability becomes a technical problem to be solved in the field. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a support-free and mould-free prestressed close rib hollow superposed floor and a construction method thereof, which aim to realize the whole-flow support-free and mould-free construction of the floor, save a full scaffold and a traditional template, greatly improve the construction efficiency and reduce the cost, provide five differential span seam structures, adapt to different construction precision, cost and efficiency requirements, improve seam integrity and crack resistance, design a double-adaptation beam-column node with/without a column cap, consider the bearing capacity of a heavy-load scene and the space utilization of a conventional scene, optimize a prestress tensioning end structure, add a drainage system, improve the durability of a prestress system, combine a prestress technology and the hollow close rib structure, realize 8-24 m large span, reduce the dead weight of the floor and reduce the load of a vertical structure. The invention provides a support-free mould-free prestressed rib hollow superposed floor system, which comprises a prefabricated rib hollow module, prestressed ribs, a cast-in-situ superposed layer, beam column joints and a span joint structure, wherein the prefabricated rib hollow module is provided with a reinforcing mould box which is used for replacing a traditional template to form a pouring cavity, the bottom of the prefabricated rib hollow module is temporarily supported through a support pad which replaces a full-hall scaffold to realize support-free construction, the prestressed ribs are arranged in a reserved channel of the prefabricated rib hollow module in a penetrating manner, the cast-in-situ superposed layer is poured above the prefabricated rib hollow module and forms an integral stressed structure with the module, and the beam column joints are divided into two structural forms of a cap joint with a column and a joint without a cap, and the span joint structure is used for splicing and connecting adjacent prefabricated rib hollow modules. The full-flow support-free and mould-free building cover is realized, a full scaffold and a traditional template are omitted, and labor and material cost is greatly reduced. The joints of the double-type beam columns are matched with the midspan joints in multiple scene