CN116927402B - Full-prefabricated girderless floor system connected by prestress and construction method thereof - Google Patents
Full-prefabricated girderless floor system connected by prestress and construction method thereofInfo
- Publication number
- CN116927402B CN116927402B CN202310790802.6A CN202310790802A CN116927402B CN 116927402 B CN116927402 B CN 116927402B CN 202310790802 A CN202310790802 A CN 202310790802A CN 116927402 B CN116927402 B CN 116927402B
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- prefabricated
- column
- floor slab
- precast
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4114—Elements with sockets
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B1/4157—Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
- E04B1/6801—Fillings therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
- E04B1/6812—Compressable seals of solid form
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/023—Separate connecting devices for prefabricated floor-slabs
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/04—Load-carrying floor structures formed substantially of prefabricated units with beams or slabs of concrete or other stone-like material, e.g. asbestos cement
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/10—Ducts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
- E04B2001/4192—Connecting devices specially adapted for embedding in concrete or masonry attached to concrete reinforcing elements, e.g. rods or wires
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
- E04B2001/6818—Joints with swellable parts
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention provides a pre-stress connected full-precast girderless floor system and a construction method thereof, wherein the full-precast floor system comprises a full-precast floor slab and precast columns supported on the lower surface of the full-precast floor slab; the prefabricated column comprises a prefabricated column top, an overhanging column longitudinal rib, a column top bracket, an overhanging anchoring screw rod, a prestressed reinforcement, a pre-buried metal corrugated pipe, a prestressed pore, an anchor screw rod, a nut and a gasket, wherein the column top bracket is arranged at the top of the prefabricated column, the overhanging anchoring screw rod is arranged at the top of the column top bracket, the prestressed reinforcement is arranged at the upper part of the fully prefabricated floor, the pre-buried metal corrugated pipe is arranged at the middle part of the fully prefabricated floor, screw rod through holes vertically penetrating along the thickness direction of the fully prefabricated floor are arranged at the periphery of the pre-buried metal corrugated pipe, the prestressed pore is arranged at the four sides of the fully prefabricated floor, the column longitudinal rib at the top of the prefabricated column is in plug connection with the pre-buried metal corrugated pipe and is anchored through grouting, the anchoring screw rod is in plug connection with the screw rod through holes and is fixed through the nut and the gasket, and the prestressed ribs are arranged in the prestressed pore channels of the two fully prefabricated floors in a penetrating manner. The invention can solve the technical problems of complicated operation, large wet work workload and large labor requirement of the template installing and detaching operation of the bracket on the flat floor construction site.
Description
Technical Field
The invention relates to the field of flat slabs, in particular to a pre-stress connected full-prefabricated flat slab system and a construction method thereof.
Background
The flat slab is a slab-column structure system without beams, the slab is directly supported on columns, and the floor load is directly transmitted to the foundation through the columns. The thickness of the girderless floor is smaller than that of the beam floor, so that the use space of the building can be effectively increased, the partition wall can be freely arranged, and the girderless floor is particularly suitable for buildings such as office buildings, exhibition halls and workshops, which need to change the use space frequently. For the structural system of the girderless floor, the scheme of 'precast columns + cast-in-situ floor or semi-precast floor' is mostly adopted in actual construction, a large number of support templates are required to be installed after the precast columns are installed in place, then floor reinforcement binding and concrete pouring are carried out, finally the support templates are removed, the construction is repeated on each layer until all floors are constructed, the method can cause the restriction of sequence among working procedures of each stage, the construction period cannot be shortened by technical means, the workload of on-site wet operation is large, and the labor requirement is high.
The invention patent application with the application number of CN202111190276.7 is improved on the basis of cast-in-situ, and the scheme in the application omits the traditional process of installing and detaching the floor support, but adds the process of installing and detaching the auxiliary supports such as the column cap diagonal rod, the steel pulling plate frame and the like, so that the installing and detaching work on a construction site is limited, and a large amount of wet work for binding reinforcing steel bars and pouring concrete still exists on the construction site. Therefore, there is a need to design a flat roof system and a corresponding construction method, which can effectively reduce the complicated bracket template installation work on the construction site, reduce the wet operation on the construction site, reduce the labor force use, and adjust the construction procedure to improve the construction efficiency.
Disclosure of Invention
The invention aims to provide a pre-stress connected full-prefabricated girderless floor system and a construction method thereof, which aim to solve the technical problems of complex assembly and disassembly work of a bracket template on a girderless floor construction site, large wet work workload, large labor force demand pressure and low construction efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a pre-stressed connected full precast girderless floor slab system which is characterized by comprising a full precast floor slab and precast columns supported on the lower surface of the full precast floor slab, wherein the precast columns are reinforced concrete columns, column longitudinal ribs are arranged on the tops of the precast columns, column top brackets are arranged on the tops of the column top brackets, an overhanging anchoring screw rod is arranged on the tops of the column top brackets, the full precast floor slab is a rectangular reinforced concrete floor slab, pre-stressed steel bars are horizontally arranged in the longitudinal direction and the transverse direction of the upper part of the full precast floor slab, pre-embedded metal corrugated pipes vertically penetrating in the thickness direction are arranged in the middle of the full precast floor slab, screw rod through holes vertically penetrating in the thickness direction of the full precast floor slab are arranged on the periphery of the pre-embedded metal corrugated pipes, the upper part apertures of the screw rod through holes are larger than the lower apertures, a plurality of pre-stressed pore channels and key grooves are formed in the four sides of the full precast floor slab, grouting materials are filled between the column longitudinal ribs and the pre-embedded metal corrugated pipes, the anchoring screw rods are in plug-in connection with the screw rod through holes and fixed through nuts and the gaskets, two full precast floor slabs are connected through the pre-stressed steel bars, the pre-stressed steel bars penetrate through the pre-stressed steel bars in the longitudinal direction of the screw rods, the pre-stressed steel bars are arranged in the pre-stressed steel pipes, and the pre-stressed steel tubes are arranged in the pre-stressed steel pipe, and the pre-stressed steel pipe is arranged in the sealing sleeve and the sealing sleeve is arranged at the bottom of the two pre-stressed floor slab.
Preferably, the shape of the prestressed duct is arc, two orifices of the prestressed duct are respectively positioned on the top surface and the side surface of the full precast floor slab, the key slot is arranged at the orifice of the top surface of the full precast floor slab, and the anchoring device is arranged inside the key slot and fixedly connected with the prestressed rib.
Preferably, the upper part of the screw through hole occupies one third of the total length of the screw through hole, the upper part of the screw through hole is arranged in a gradually expanding shape, and the lower part of the screw through hole is arranged in a constant cross section.
Preferably, the minimum diameter of the upper part of the screw through hole is larger than the diameters of the nut and the gasket, and the diameter of the lower part of the screw through hole is smaller than the diameters of the nut and the gasket.
Preferably, the backing material is a polyethylene foam strip.
Preferably, the top surface of the prefabricated column is provided with a groove for enhancing the shear bearing capacity of the horizontal seam between the prefabricated column and the full prefabricated floor slab.
Preferably, the cross section of the prefabricated column is rectangular or circular.
Preferably, the number of the pre-buried metal corrugated pipes is the same as that of the column longitudinal ribs, the positions of the pre-buried metal corrugated pipes are corresponding, and the inner diameter of the pre-buried metal corrugated pipes is larger than the diameter of the column longitudinal ribs.
Preferably, the number of the screw through holes is the same as that of the anchor screws, and the positions of the screw through holes are corresponding, and the inner diameter of the screw through holes is larger than the diameter of the anchor screws.
The invention also provides a construction method of the full-prefabricated girderless floor system connected by prestress, which is characterized by comprising the following steps:
step one, manufacturing prefabricated columns and full prefabricated floors according to design requirements, and preparing matched nuts and gaskets, prestressed tendons and anchoring devices;
Step two, positioning according to a plane layout diagram, hoisting and installing prefabricated columns one by one, and paving mortar on the top surfaces of column top brackets of the prefabricated columns;
Step three, lifting a full prefabricated floor slab according to a positioning layout of the full prefabricated floor slab;
Hoisting the full prefabricated floor slab to the position of the prefabricated column top, and falling the full prefabricated floor slab to the column top according to the relative position relation between the column longitudinal ribs and the embedded metal corrugated pipes, and simultaneously ensuring that the column top anchoring screw rod penetrates through the corresponding screw rod through hole;
installing nuts and gaskets corresponding to the positions of the anchoring screw rods, screwing the nuts and the gaskets, rapidly realizing temporary fixation of the full prefabricated floor slab and the prefabricated column by utilizing the fastening action of the nuts and the gaskets, and then unloading the lifting hook of the full prefabricated floor slab;
step six, repeating the operations from the step three to the step five, and temporarily installing and fixing all the fully prefabricated floors to the tops of the prefabricated columns;
Step seven, filling backing materials at the bottoms of all prefabricated floor joints respectively, and using the backing materials as bottom molds for grouting joint positions;
Step eight, penetrating prestressed tendons in prestressed duct of two full precast floor slabs adjacent to each joint, placing a section of steel bar sleeve in the joint, ensuring the prestressed tendons to penetrate through the steel bar sleeve, and initially fixing and tensioning the prestressed tendons by using an anchoring device;
step nine, manufacturing joint micro-expansion concrete, and pouring the joint micro-expansion concrete into joint positions of the full prefabricated floor slab one by one;
Tenth, after the joint concrete meets the design specification requirements, tensioning the prestressed tendons at the joint, and installing an anchoring device at the end part to finish final anchoring;
step eleven, cement-based grouting material is manufactured, grouting is carried out in a metal corrugated pipe pre-buried in the full prefabricated floor slab, and permanent connection between the prefabricated column and the full prefabricated floor slab is realized after the grouting material is hardened;
step twelve, repeating the operations from the step two to the step eleven to realize the installation of the prefabricated column of the next layer and the full prefabricated floor slab;
And thirteenth, after the prefabricated columns and the full prefabricated floor slabs on the same layer are installed, cement mortar is manufactured, key grooves of prestressed duct outlets exposed at the tops of screw through holes and the peripheries of the full prefabricated floor slabs are plugged, and joint gluing treatment is carried out along the joint bottoms of all the full prefabricated floor slabs by using building sealant, so that all installation operations of the prefabricated columns and the full prefabricated floor slabs are realized.
The beneficial effects of the invention are as follows:
The invention provides a pre-stress connected full-precast girderless floor system and a construction method thereof, wherein the full-precast floor system comprises a full-precast floor slab and a full-precast floor slab, the full-precast floor slab and the full-precast floor slab can be quickly and efficiently installed in a dry mode, the working procedures of widely installing and dismantling templates, supports and the like in a field floor slab region are avoided, pre-stress steel bars are arranged on the upper part of the full-precast floor slab, the problem of tension cracking of the upper surface of a top-column position floor slab caused by excessive dead weight and additional load of the full-precast floor slab cantilever is avoided, the function of controlling the downward deflection deformation of the cantilever end of the precast floor slab is achieved, the span stress distribution condition of the floor slab can be effectively improved, the stress level is reduced, the integral stress of a structure is facilitated, the connection mode of the pre-stress steel bars is adopted between the full-precast floor slabs, the work of site binding the steel bars and pouring concrete is not needed, the site concrete pouring work is only needed, and the labor force demand pressure is reduced.
The invention provides a pre-stress connected full-precast girderless floor system and a construction method thereof, wherein a post longitudinal rib is adopted at the connection part of the full-precast floor slab and a precast post to penetrate through a pre-buried metal corrugated pipe in the floor slab, the post grouting is adopted to realize an anchoring connection scheme, the field operation difficulty is simplified, the problem of cross frame beating of a connecting reinforcing steel bar in a post top area is avoided, the installation and positioning efficiency is improved, and the adoption of the post connection scheme fastened by an anchoring bolt can ensure that the full-precast floor slab and the precast post are quickly and temporarily connected and fixed before the slurry anchor connection of the post longitudinal rib is established, thereby meeting the construction and installation safety requirements of components and simultaneously being used as a reinforcing part of the post connection.
The pre-stress connected full-precast girderless floor system and the construction method thereof provided by the invention have the further advantages that compared with the traditional cast-in-situ composite floor slab which is required to finish the construction of the last step to perform the construction of the next step with low efficiency, the invention can realize synchronous and mutually-unaffected different working procedures, greatly shortens the construction period, greatly improves the construction efficiency and further saves the labor force.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The primary object and other advantages of the invention may be realized and attained by means of the instrumentalities and particularly pointed out in the specification.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is an enlarged view of the junction of a precast column and an all precast floor slab of the present invention.
Fig. 4 is an enlarged view of the junction of adjacent fully prefabricated floors of the present invention.
Fig. 5 is a schematic view of the present invention for installing a two-story, flat floor.
The reference numerals are 1-full precast floor slabs, 2-precast columns, 3-prestressed tendons, 4-anchoring devices, 5-reinforced sleeves, 6-backing materials, 7-building sealant, 11-pre-buried metal corrugated pipes, 12-screw through holes, 13-prestressed duct, 14-key grooves, 15-prestressed reinforcements, 21-column longitudinal tendons, 22-column top brackets, 23-anchoring screws, 24-nuts and gaskets. Detailed Description
The technical solutions of the present invention will be described in detail below by means of examples, which are only exemplary, and are only used to explain and illustrate the technical scheme of the invention, and are not to be construed as limiting the technical scheme of the invention.
Referring to fig. 1-2, the present invention provides a pre-stressed connected full precast girderless floor system comprising a full precast floor slab 1 and precast columns 2 supported on the lower surface of the full precast floor slab 1; the prefabricated column 2 is a reinforced concrete column, column longitudinal ribs 21 extend outwards from the top surface of the prefabricated column 2, and the length of the column longitudinal ribs 21 is enough to penetrate through the full prefabricated floor slab 1 and can be connected with the prefabricated column 2 on the upper layer; the top of the prefabricated column 2 is provided with a column top bracket 22; the top surface of the column top bracket 22 is provided with an overhanging anchoring screw 23, the overhanging part of the anchoring screw 23 is longer than the thickness of the full precast floor slab 1 and can be fastened by using nuts and gaskets 24, the full precast floor slab 1 is a rectangular reinforced concrete floor slab, the longitudinal and transverse directions of the upper part of the full precast floor slab 1 are horizontally provided with prestressed reinforcements 15, the specification and the spacing of the prestressed reinforcements 15 are determined by design and meet the requirement of the overhanging construction and installation of the subsequent floor slab, the middle part of the full precast floor slab 1 is provided with an embedded metal corrugated pipe 11 vertically penetrating in the thickness direction, the periphery of the embedded metal corrugated pipe 11 is provided with a screw through hole 12 vertically penetrating in the thickness direction of the full precast floor slab 1, the upper pore diameter of the screw through hole 12 is larger than the lower pore diameter, the upper part of the screw through hole 12 occupies one third of the total length of the screw through hole 12, the upper part of the screw through hole 12 is in a gradually expanding shape, the lower part of the screw through hole 12 is in a uniform section, the minimum diameter of the upper part of the screw through hole 12 is larger than the diameter of the nuts and the gaskets 24, the operating space for screwing the nuts is provided, the diameter of the lower part of the screw through hole 12 is smaller than the diameter of the nuts and the gaskets 24, the four sides of the precast floor slab 1 are provided with four vertical through holes 13, the prestressed holes 13 are respectively arranged on the top surfaces of the two arc-shaped precast floor slabs 13, the orifice that is located full precast floor slab 1 top surface still sets up indent formula keyway 14, and anchor 4 sets up in keyway 14 inside and with prestressing tendons 3 fixed connection.
Referring to fig. 3, a column longitudinal rib 21 on the top surface of a prefabricated column 2 is in plug connection with an embedded metal corrugated pipe 11, grouting materials are filled between the column longitudinal rib 21 and the embedded metal corrugated pipe 11, the number of the embedded metal corrugated pipes 11 and the number of the column longitudinal ribs 21 are the same and the positions are corresponding, the inner diameter of the embedded metal corrugated pipe 11 is larger than the diameter of the column longitudinal rib 21, an anchor screw 23 is in plug connection with a screw through hole 12 and fixed through a nut and a gasket 24, the number of the screw through holes 12 and the anchor screw 23 are the same and the positions are corresponding, the inner diameter of the screw through hole 12 is larger than the diameter of the anchor screw 23, grooves are further formed in the top surface of the prefabricated column 2 and used for enhancing horizontal shearing resistance between the prefabricated column 2 and the full prefabricated floor slab 1, the cross section of the prefabricated column 2 is rectangular or circular, the cross section of a column top bracket 22 is the same as the cross section of the prefabricated column 2, the cross section of the column top bracket 22 is larger than the cross section of the prefabricated column 2, the contact area between the prefabricated floor slab and the prefabricated column 2 is reduced.
Referring to fig. 4, two fully prefabricated floors 1 are connected through prestressed tendons 3, the prestressed tendons 3 are arranged in prestressed duct 13 of the two fully prefabricated floors 1 in a penetrating mode, anchoring devices 4 used for fixing and tensioning are arranged at two ends of the prestressed tendons 3, reinforcing steel sleeves 5 are sleeved in the middle of the prestressed tendons 3, backing materials 6 are further filled at bottoms of joints of the two fully prefabricated floors 1, polyethylene foam strips can be used as the backing materials 6, and building sealant 7 is arranged on the lower end face of the backing materials 6.
Referring to fig. 5, sleeves are arranged at the bottoms of the prefabricated columns 2, the sleeves correspond to the column longitudinal ribs 21 in number and position, when the first-layer prefabricated columns 2 and the full-prefabricated floor 1 are completely installed and then the second-layer prefabricated columns 2 are installed, the prefabricated columns 2 are hoisted, the sleeves are aligned with the column longitudinal ribs 21 on the top surface of the lower-layer prefabricated columns 2, the column longitudinal ribs 21 are inserted into the sleeves, and grouting treatment is carried out on the sleeves, so that connection of the upper-layer prefabricated columns 2 and the lower-layer prefabricated columns 2 is realized.
The invention also provides a construction method of the prestress-connected full-prefabricated girderless floor system, which comprises the following steps:
step one, manufacturing prefabricated columns 2 and full prefabricated floor slabs 1 according to design requirements, and preparing matched nuts and gaskets 24, prestressed tendons 3 and anchoring devices 4;
Step two, positioning according to a floor plan, hoisting and installing prefabricated columns 2 one by one, and paving mortar on the top surfaces of column top brackets 22 of the prefabricated columns 2;
Step three, according to the positioning layout of the full prefabricated floor slab 1, hoisting a full prefabricated floor slab 1;
hoisting the full prefabricated floor slab 1 to the top position of the prefabricated column 2, and falling the full prefabricated floor slab 1 to the top of the column according to the relative position relation between the column longitudinal ribs 21 and the pre-buried metal corrugated pipes 11, and simultaneously ensuring that the column top anchoring screws 23 penetrate through corresponding screw through holes 12;
step five, installing nuts and gaskets 24 at positions corresponding to the anchor screw rods 23, screwing the nuts and the gaskets 24, rapidly realizing temporary fixation of the full prefabricated floor slab 1 and the prefabricated column 2 by utilizing the fastening action of the nuts and the gaskets 24, and then unloading the lifting hook of the full prefabricated floor slab 1;
step six, repeating the operations from the step three to the step five, and temporarily installing and fixing all the fully prefabricated floor slabs 1 to the tops of the prefabricated columns 2;
step seven, filling backing materials 6 at the bottoms of the joints of all prefabricated floor slabs 1 respectively, and using the backing materials as bottom molds for grouting the joint positions;
step eight, penetrating the prestressed tendons 3 in the prestressed duct 13 of two full precast floor slabs 1 adjacent to each joint, placing a section of steel bar sleeve 5 in the joint, ensuring that the prestressed tendons 3 penetrate through the steel bar sleeve 5, and initially fixing and tensioning the prestressed tendons 3 by using an anchor device 4;
step nine, manufacturing joint micro-expansion concrete, and pouring the joint micro-expansion concrete into joint positions of the full prefabricated floor slab 1 one by one;
tenth, after the joint concrete meets the design specification requirements, tensioning the prestressed tendons 3 at the joint, and installing an anchoring device 4 at the end part to finish final anchoring;
step eleven, cement-based grouting material is manufactured, grouting is carried out in the metal corrugated pipe pre-embedded in the full prefabricated floor slab 1, and permanent connection between the prefabricated column 2 and the full prefabricated floor slab 1 is realized after the grouting material is hardened;
step twelve, repeating the operations from the step two to the step eleven to realize the installation of the prefabricated column 2 of the next layer and the full prefabricated floor slab 1;
and thirteenth, after the prefabricated columns 2 and the full prefabricated floor slabs 1 on the same layer are installed, cement mortar is manufactured, key grooves 14 at the tops of screw through holes 12 and outlets of prestressed pore channels 13 exposed at the periphery of the full prefabricated floor slabs 1 are plugged, and joint glue spraying treatment is carried out along the joint bottoms of the full prefabricated floor slabs 1 by using building sealant 7, so that all installation operations of the prefabricated columns 2 and the full prefabricated floor slabs 1 are realized.
Furthermore, in actual engineering, the construction sequence from the eleventh step to the thirteenth step can be adjusted according to actual requirements so as to achieve the effects of synchronous operation and shortening the construction period.
The foregoing is merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions that would occur to those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The full-precast girderless floor slab system connected by prestress is characterized by comprising a full-precast floor slab (1) and precast columns (2) supported on the lower surface of the full-precast floor slab (1);
The prefabricated column (2) is a reinforced concrete column, column longitudinal ribs (21) are extended out of the top surface of the prefabricated column (2), column top brackets (22) are arranged at the top of the prefabricated column (2), and an extended anchoring screw (23) is arranged on the top surface of the column top brackets (22);
The full prefabricated floor slab (1) is a rectangular reinforced concrete floor slab, prestressed steel bars (15) are horizontally arranged in the longitudinal direction and the transverse direction of the upper part of the full prefabricated floor slab (1), an embedded metal corrugated pipe (11) vertically penetrating in the thickness direction is arranged in the middle of the full prefabricated floor slab (1), a screw through hole (12) vertically penetrating in the thickness direction of the full prefabricated floor slab (1) is arranged at the periphery of the embedded metal corrugated pipe (11), the aperture of the upper part of the screw through hole (12) is larger than the aperture of the lower part of the screw through hole, and a plurality of prestressed pore channels (13) and key grooves (14) are respectively arranged on four sides of the full prefabricated floor slab (1);
The column longitudinal ribs (21) on the top surface of the prefabricated column (2) are connected with the embedded metal corrugated pipe (11) in an inserting mode, grouting materials are filled between the column longitudinal ribs (21) and the embedded metal corrugated pipe (11), and the anchoring screw (23) is connected with the screw through hole (12) in an inserting mode and fixed through the nuts and the gaskets (24);
The two adjacent full precast floors (1) are connected through the prestressed tendons (3), the prestressed tendons (3) are arranged in the prestressed duct (13) of the two full precast floors (1) in a penetrating mode, anchoring devices (4) used for fixing and tensioning are arranged at two ends of the prestressed tendons (3), reinforcing steel bar sleeves (5) are sleeved in the middle of the prestressed tendons (3), backing materials (6) are filled at the bottoms of joints of the two full precast floors (1), and building sealant (7) is arranged on the lower end face of each backing material (6).
2. A pre-stressed connected full precast girderless floor system according to claim 1, characterized in that the pre-stressed duct (13) is arc-shaped, two openings of the pre-stressed duct (13) are respectively positioned on the top surface and the side surface of the full precast floor slab (1), the key slot (14) is arranged at the opening of the top surface of the full precast floor slab (1), and the anchoring device (4) is arranged inside the key slot (14) and fixedly connected with the pre-stressed tendons (3).
3. A pre-stressed connected full precast girderless floor system according to claim 2, wherein the upper part of the screw through hole (12) occupies one third of the total length of the screw through hole (12), the upper part of the screw through hole (12) is arranged in a gradually expanding shape, and the lower part of the screw through hole (12) is arranged in a constant cross section.
4. A pre-stressed connected full precast girderless floor system according to claim 3, wherein the minimum diameter of the upper part of the screw through hole (12) is larger than the diameter of the nut and washer (24), and the diameter of the lower part of the screw through hole (12) is smaller than the diameter of the nut and washer (24).
5. A pre-stressed connected full precast girderless floor system according to claim 2, wherein the backing material (6) is a polyethylene foam strip.
6. A pre-stressed connected full precast girderless floor system according to claim 2, wherein the top surface of the precast column (2) is provided with grooves for enhancing the shear load capacity of the horizontal joint between the precast column (2) and the full precast floor slab (1).
7. A pre-stressed connected full precast girderless floor system according to claim 2, characterized in that the cross section of the precast column (2) is rectangular or circular.
8. A pre-stressed connected full precast girderless floor system according to claim 2, characterized in that the number of pre-buried metal bellows (11) and the number of column longitudinal ribs (21) are the same and the positions are corresponding, and the inner diameter of the pre-buried metal bellows (11) is larger than the diameter of the column longitudinal ribs (21).
9. A pre-stressed connected full precast girderless floor system according to claim 2, characterized in that the number of screw through holes (12) and the anchoring screws (23) are the same, the positions are corresponding, the inner diameter of the screw through holes (12) is larger than the diameter of the anchoring screws (23).
10. A method of constructing a pre-stressed connected full precast girderless floor system according to any one of claims 1 to 9, comprising the steps of:
firstly, manufacturing prefabricated columns (2) and full prefabricated floors (1) according to design requirements, and preparing matched nuts and gaskets (24), prestressed tendons (3) and anchoring devices (4);
Step two, positioning according to a plane layout diagram, hoisting and installing prefabricated columns (2) one by one, and paving mortar on the top surfaces of column top brackets (22) of the prefabricated columns (2);
thirdly, hoisting a full prefabricated floor slab (1) according to a positioning layout of the full prefabricated floor slab (1);
Hoisting the full prefabricated floor slab (1) to the top position of the prefabricated column (2), and falling the full prefabricated floor slab (1) to the top of the column according to the relative position relation between the column longitudinal ribs (21) and the pre-buried metal corrugated pipe (11), and simultaneously ensuring that a column top anchoring screw (23) penetrates through a corresponding screw through hole (12);
Step five, installing nuts and gaskets (24) corresponding to the positions of the anchoring screw rods (23) and tightening the nuts and the gaskets (24), rapidly realizing temporary fixation of the full prefabricated floor slab (1) and the prefabricated column (2) by utilizing the fastening action of the nuts and the gaskets (24), and then, unloading the lifting hook of the full prefabricated floor slab (1);
step six, repeating the operations from the step three to the step five, and temporarily installing and fixing all the fully prefabricated floors (1) to the tops of the prefabricated columns (2);
step seven, filling backing materials (6) at the bottoms of the joints of all prefabricated floor slabs (1) respectively, and using the backing materials as bottom molds for grouting the joint positions;
Step eight, penetrating the prestressed tendons (3) in prestressed duct (13) of two full precast floor slabs (1) adjacent to each joint, placing a section of reinforced sleeve (5) in the joint, ensuring that the prestressed tendons (3) penetrate through the reinforced sleeve (5), and initially fixing and tensioning the prestressed tendons (3) by using an anchoring device (4);
step nine, manufacturing joint micro-expansion concrete, and pouring the joint micro-expansion concrete into joint positions of the full prefabricated floor slab (1) one by one;
tenth, after the joint concrete meets the design specification requirement, tensioning the prestressed tendons (3) at the joint, and installing an anchoring device (4) at the end part to finish final anchoring;
Step eleven, cement-based grouting material is manufactured, grouting is carried out in a metal corrugated pipe pre-buried in the full prefabricated floor slab (1), and permanent connection between the prefabricated column (2) and the full prefabricated floor slab (1) is realized after the grouting material is hardened;
step twelve, repeating the operations from the step two to the step eleven to realize the installation of the prefabricated column (2) of the next layer and the full prefabricated floor slab (1);
And thirteenth, after the prefabricated columns (2) and the full prefabricated floor slab (1) on the same layer are installed, cement mortar is manufactured, key grooves (14) of outlets of prestressed pore channels (13) exposed at the tops of screw through holes (12) and the peripheries of the full prefabricated floor slab (1) are plugged, and joint gluing treatment is carried out along the joint bottoms of the full prefabricated floor slabs (1) by using building sealant (7), so that all installation operations of the prefabricated columns (2) and the full prefabricated floor slab (1) are realized.
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| CN202310790802.6A CN116927402B (en) | 2023-06-30 | 2023-06-30 | Full-prefabricated girderless floor system connected by prestress and construction method thereof |
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| CN202310790802.6A CN116927402B (en) | 2023-06-30 | 2023-06-30 | Full-prefabricated girderless floor system connected by prestress and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883051A (en) * | 2014-03-13 | 2014-06-25 | 中国十七冶集团有限公司 | Assembling type plate-beam connecting joint and construction method thereof |
| CN211690996U (en) * | 2019-11-22 | 2020-10-16 | 上海浦凯预制建筑科技有限公司 | Large-span precast prestressed concrete hollow floor structure with flat-bottom surface beam |
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| CN107882233A (en) * | 2017-12-11 | 2018-04-06 | 刘祥锦 | A kind of unit floor of assembled flatslab construction |
| CN109403458A (en) * | 2018-12-18 | 2019-03-01 | 有利华建材(惠州)有限公司 | Novel pre-fabricated one |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883051A (en) * | 2014-03-13 | 2014-06-25 | 中国十七冶集团有限公司 | Assembling type plate-beam connecting joint and construction method thereof |
| CN211690996U (en) * | 2019-11-22 | 2020-10-16 | 上海浦凯预制建筑科技有限公司 | Large-span precast prestressed concrete hollow floor structure with flat-bottom surface beam |
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Effective date of registration: 20250925 Address after: 100102 Beijing City, Chaoyang District Road No. 17 building, Wanghua Patentee after: CHINA CONSTRUCTION FIRST DIVISION GROUP CONSTRUCTION & DEVELOPMENT Co.,Ltd. Country or region after: China Patentee after: CSCEC (Tianjin) Industrial Construction Engineering Co.,Ltd. Address before: 100102 Beijing City, Chaoyang District Road No. 17 building, Wanghua Patentee before: CHINA CONSTRUCTION FIRST DIVISION GROUP CONSTRUCTION & DEVELOPMENT Co.,Ltd. Country or region before: China |