CN111877621A - Precast concrete superstructure slab joint H shaped steel connected node - Google Patents
Precast concrete superstructure slab joint H shaped steel connected node Download PDFInfo
- Publication number
- CN111877621A CN111877621A CN202010640803.9A CN202010640803A CN111877621A CN 111877621 A CN111877621 A CN 111877621A CN 202010640803 A CN202010640803 A CN 202010640803A CN 111877621 A CN111877621 A CN 111877621A
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- China
- Prior art keywords
- shaped steel
- precast concrete
- concrete floor
- floor slab
- welded
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
-
- 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
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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
- E04B5/02—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
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
Abstract
The invention discloses a prefabricated concrete floor slab joint H-shaped steel connecting node, relates to a welding connecting node applied to a fully-assembled concrete floor, and belongs to the technical field of prefabricated concrete structure engineering. The connection node include precast concrete floor, pre-buried H shaped steel that need connect, respectively with its upper and lower flange inboard welded a pair of "eight" style of calligraphy anchor bars and with two adjacent H shaped steel upper and lower flange outside welded fastening's rectangle steel sheet, H shaped steel web thickness is less than flange thickness, respectively lay one deck reinforcing bar net piece at the bottom of precast concrete floor's the roof and the board. The connecting node is arranged in the middle of the plate seam to resist the action of shear load. The connecting joint has the advantages of reliable quality, simple manufacture, convenient construction, clear load transmission, good waterproofness and stronger applicability.
Description
Technical Field
The invention relates to a welded connection node applied to a precast concrete floor system, and belongs to the technical field of precast concrete structure engineering.
Background
The precast concrete structure is used as an important carrier for building industrialization, and has attracted high attention of people in a high-efficiency, rapid and civilized construction mode, and the precast concrete building has a wider development space along with further national advocation of energy conservation and emission reduction and increasing demands of people on high-quality construction.
The floor system is used as a horizontal lateral force resisting component of a building structure, and the design of the floor system can meet the requirements of structural bearing capacity, rigidity and integrity at the same time. The existing earthquake-resistant standard stipulates that the fabricated floor is a semi-rigid floor, and in fact, the in-plane mechanical property of the prefabricated floor has profound influence on the integrity and the earthquake-resistant property of the building structure.
The common assembled superstructure in foreign country is mostly two T board roofs, according to the difference of connected mode three main categories: 1) the floor system is connected only by the concrete post-cast layer; 2) the 'dry' floor system is connected only by the pre-buried mechanical connecting piece; 3) the composite floor system is comprehensively connected by the concrete post-cast layer and the pre-buried mechanical connecting piece. Investigation shows that: once the post-cast layer at the wet plate seam is cracked, the floor system is subjected to brittle failure; once the post-cast layer at the seam of the composite floor slab cracks, the in-plane rigidity and the bearing capacity of the floor slab can be rapidly reduced to the level when only mechanical connecting pieces are arranged. Therefore, the contribution of the concrete post-cast layer to the integrity of the fabricated floor is not ideal.
The common assembled floor system in China is a laminated floor system. The prefabricated plate part of the superposed floor system can provide template support for the construction of an upper concrete post-cast layer, pipeline equipment is pre-embedded in the upper concrete post-cast layer, the thickness of the superposed floor system is usually larger than that of a cast-in-place floor system during design, the material consumption is increased, and the self weight of the structure, the earthquake action and the overall cost are increased. The dual use of prefabrication and cast-in-place does not significantly simplify the construction process.
The fully-assembled floor system is a floor system which adopts floor slab full prefabrication and adopts distributed pre-buried mechanical connecting pieces to connect the slabs so as to realize the integrity of the floor. The prefabricated floor slab is conveyed to the site and directly hoisted in sequence, the connecting piece is installed, a cast-after-concrete layer is not required to be cast in the site, the construction process is simplified, and the influence of weather on the construction efficiency is avoided. The thickness of the plate can be equal to that of a cast-in-place floor. The construction of the fully-assembled floor system reduces the dust and noise pollution of a construction site, facilitates the realization of civilized construction, and accords with the environmental protection concept of green building and sustainable development.
A common foreign full-assembly type concrete floor is a double-T-plate floor, and a mechanical connecting piece is used for flange connection of the double-T-plate and belongs to the application range of unidirectional plates. The double-T plate has uneven bottom, larger structure height and limited application range. The concrete bidirectional floor slab with a relatively flat slab bottom is often adopted in the design of the building structure in China. If a fully-assembled floor system is adopted, the slab joint connection of the prefabricated floor slab is the key of design, the stress of the pre-buried mechanical connecting piece is simple in structure, and the materials are convenient to obtain. Theoretically, the stress states of different positions of the full-assembly type concrete floor slab joints are different, and the performance requirements of the connecting pieces are also different.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an H-shaped steel connecting node for a prefabricated concrete floor slab gap, which solves the problem of connection between a fully assembled concrete floor slab and a slab and realizes bidirectional stress of the concrete floor slab.
The technical scheme is as follows: the H-shaped steel connecting nodes of the precast concrete floor slab joints are positioned in the middle of the joints of the precast concrete floor slab, each joint is provided with a plurality of H-shaped steel connecting nodes and comprises the precast concrete floor slab to be connected, pre-embedded H-shaped steel, a pair of splayed anchor bars respectively welded with the inner sides of upper and lower flanges of the H-shaped steel, and rectangular steel plates welded and fixed with the outer sides of the upper and lower flanges of the two adjacent H-shaped steel, the thickness of a web plate of the H-shaped steel is smaller than that of the flange, and a layer of reinforcing mesh is respectively paved on the top and the bottom of the precast concrete floor slab.
Wherein, every H shaped steel connected node department sets up two the same H shaped steel, and the board seam left and right sides respectively sets up one promptly, and H shaped steel cross section is on a parallel with the board seam direction, and wholly pre-buried advances in the precast concrete floor, cross section and flange limit parallel and level.
The splayed anchor bars are three-level twisted steel bars and are welded on the upper flange and the lower flange of the H-shaped steel, and a pair of splayed anchor bars are respectively welded on the inner sides of the upper flange and the lower flange by taking the web as a symmetrical surface, so that the sufficient anchoring length is ensured.
The rectangular steel plate is welded on the outer sides of the upper flange and the lower flange of two adjacent H-shaped steel respectively, and the two H-shaped steel at the same node are connected in a three-side girth welding mode. The width of the rectangular steel plate is smaller than the width of the flange of the H-shaped steel. And the welded rectangular steel plate is flush with the top surface and the bottom surface of the precast concrete floor slab.
Has the advantages that: 1. the invention has reliable quality: the precast concrete floor slab with the embedded H-shaped steel connecting piece is manufactured in a standardized way in a factory, and the quality is reliable; 2. the manufacturing is simple: the connecting piece is made of H-shaped steel, common steel plates and common steel bars with common specifications, has a simple structural form and is easy to realize standardized production; 3. the construction is convenient: after the precast concrete floor slab is hoisted in place in a construction site, the rectangular steel plates are directly welded to complete the joint connection work, a concrete post-pouring layer is not needed, and the construction efficiency is improved; 4. the load transmission is clear: the connecting node can transmit various stresses of the floor under the horizontal and vertical earthquake action and wind load of the floor in the transverse and longitudinal directions, so that the aim of bidirectional stress of the floor is fulfilled, and the shear bearing capacity and shear rigidity of the connecting piece are obviously improved by the restraint of concrete on two sides of an H-shaped steel web plate; 5. good water resistance: the connecting piece is connected with the flange of the H-shaped steel into a whole by welding the upper rectangular steel plate and the lower rectangular steel plate, and no notch is formed in the connecting piece and the periphery of the connecting piece, so that the water leakage phenomenon at the connecting part is avoided; 6. the applicability is strong: this type connected node is applicable to the board bottom and relatively for smooth full assembled concrete superstructure, has ensured certain headroom, and public buildings such as shopping malls, industrial factory building can all adopt the full assembled concrete superstructure of this type of connection.
Drawings
FIG. 1 is a plan view of the present invention;
FIG. 2 is a schematic view of the structure of section A-A of FIG. 1 without precast concrete floor slab;
FIG. 3 is a schematic view of the cross-sectional structure B-B of the present invention;
FIG. 4 is a top view of the H-beam of the present invention welded with the "eight" type anchor bars.
Detailed Description
Referring to fig. 1 to 4, the H-section steel connection nodes of the precast concrete floor slab joints according to the embodiment of the invention are located in the middle of the joints of the precast concrete floor slab, each joint is provided with a plurality of H-section steel connection nodes, each H-section steel connection node comprises a precast concrete floor slab 2 to be connected, a pre-buried H-section steel 1, a pair of splayed anchor bars 3 respectively welded to the inner sides of the upper and lower flanges of the H-section steel 1, and rectangular steel plates 4 welded and fixed to the outer sides of the upper and lower flanges of two adjacent H-section steels, the thickness of the web of the H-section steel 1 is smaller than that of the flange, and a layer of reinforcing mesh 6 is respectively laid on the slab top and the.
Every H shaped steel connected node department sets up two the same H shaped steel 1, and the board seam left and right sides respectively sets up one promptly, and H shaped steel cross section is on a parallel with the board seam direction, and wholly pre-buried in advancing precast concrete floor 2, cross section and flange limit parallel and level.
The V-shaped anchor bars 3 are three-level twisted steel bars and are welded to the upper and lower flanges of the H-shaped steel 1, and a pair of V-shaped anchor bars are welded to the inner sides of the upper and lower flanges respectively by taking webs as symmetrical surfaces, and the sufficient anchoring length is ensured.
The rectangular steel plate 4 is welded on the outer sides of the upper flange and the lower flange of each two adjacent H-shaped steels 1 respectively and is connected with the two H-shaped steels 1 at the same node. The width of the rectangular steel plate 4 is smaller than the width of the flange of the H-shaped steel 1. The welded rectangular steel plate 4 is flush with the top surface and the bottom surface of the precast concrete floor slab 2.
The welding of the rectangular steel plate 4 and the flanges of the two adjacent H-shaped steel 1 adopts a mode of performing three-side girth welding at two ends of the rectangular steel plate 4, and after the temperature of the to-be-welded joint 5 is cooled, mortar is adopted to trowel the parts except the rectangular steel plate 4 at the joint. The middle part of the abutted seam of each precast concrete floor slab 2 is provided with a plurality of connecting nodes of the type so as to ensure the effective connection and integrity of the fully assembled concrete floor system.
The construction method of the H-shaped steel connecting joint for the slab joints of the precast concrete floor systems comprises the following steps:
and (5) processing the H-shaped steel connecting piece in a factory. As shown in fig. 4, H-section steel and three-stage twisted steel are prepared, the web thickness of the H-section steel 1 is smaller than the flange thickness, a pair of splayed anchor bars 3 are respectively welded on the inner sides of the upper and lower flanges of the H-section steel 1, taking the web as a symmetrical plane, and the sufficient anchoring length is ensured.
And (3) manufacturing a precast concrete floor slab 2 by a precast plant. The top and the bottom of the precast concrete floor slab 2 are respectively provided with a layer of reinforcing mesh 6 which is paved by distributed reinforcements in a longitudinal and transverse mode, and H-shaped steel 1 is welded in a pre-buried mode at the position of a slab joint connecting node. Each slab joint node needs to set up two the same H shaped steel 1, and the slab joint left and right sides respectively sets up one promptly, and H shaped steel 1 cross section is on a parallel with the slab joint direction, and wholly pre-buried in precast concrete floor 2, cross section and flange limit parallel and level.
And (5) conveying the processed precast concrete floor slabs 2 to a construction site, and sequentially finishing hoisting. And a rectangular steel plate 4 is welded on the outer sides of the exposed upper and lower flanges of two adjacent H-shaped steels 1 respectively so as to connect the two H-shaped steels 1 at the same node. The width of the rectangular steel plate 4 is smaller than the width of the flange of the H-shaped steel 1. The welded rectangular steel plate 4 is flush with the top surface and the bottom surface of the precast concrete floor slab 2.
The welding of the rectangular steel plate 4 and the flanges of the two adjacent H-shaped steel 1 adopts a mode of performing three-side girth welding at two ends of the rectangular steel plate 4, and after the temperature of the to-be-welded joint 5 is cooled, mortar is adopted to trowel the parts except the rectangular steel plate 4 at the joint. And at this moment, the construction of the H-shaped steel connecting joint of the slab joint of the precast concrete floor is completed, and the construction of the next connecting joint at the slab joint is repeatedly carried out.
In order to realize the effective connection and integrity of the fully-assembled concrete floor system, the number of the connecting nodes of the type to be arranged in the middle of the splicing seam of each precast concrete floor 2 is determined according to the design requirement, and then the assembling process of the whole floor system is completed.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (8)
1. Precast concrete superstructure board seam H shaped steel connected node is located the piece middle part of precast concrete floor, and every piece sets up a plurality of H shaped steel connected node, its characterized in that: including precast concrete floor, pre-buried H shaped steel that need connect, respectively with H shaped steel upper and lower flange inboard welded a pair of "eight" style of calligraphy anchor bars and with two adjacent H shaped steel upper and lower flange outside welded fastening's rectangle steel sheet, H shaped steel web thickness is less than flange thickness, respectively lay one deck reinforcing bar net piece at the bottom of precast concrete floor's the roof and the board.
2. The precast concrete floor slab gap H-shaped steel connection node of claim 1, characterized in that: every H shaped steel connected node pre-buried two the same H shaped steel, the board seam left and right sides respectively sets up one promptly, H shaped steel cross section is on a parallel with the board seam direction, and wholly pre-buried advances in the precast concrete floor, cross section and flange limit parallel and level.
3. The precast concrete floor slab gap H-shaped steel connection node of claim 1, characterized in that: the inverted V-shaped anchor bars are three-level twisted steel bars, and a pair of inverted V-shaped anchor bars are welded on the inner sides of the upper flange and the lower flange of each H-shaped steel.
4. The precast concrete floor slab gap H-shaped steel connection node of claim 3, characterized in that: the splayed anchor bars are welded on the inner sides of the flanges by taking the web of the H-shaped steel as a symmetrical surface and presenting a splayed shape.
5. The precast concrete floor slab gap H-shaped steel connection node of claim 1, characterized in that: the rectangular steel plate is welded on the outer sides of the upper flange and the lower flange of each two adjacent H-shaped steel respectively and connected with the two H-shaped steel at the same node, and the width of the rectangular steel plate is smaller than the width of the flange of the H-shaped steel.
6. The precast concrete floor slab gap H-shaped steel connecting node as claimed in claim 5, characterized in that: and the rectangular steel plate and the two adjacent H-shaped steel flanges are welded in a mode of performing three-side girth welding at two ends of the rectangular steel plate.
7. The precast concrete floor slab gap H-shaped steel connection node of claim 1, characterized in that: and a layer of reinforcing mesh which is paved by distributed ribs vertically and horizontally is respectively arranged at the top and the bottom of the precast concrete floor slab.
8. The precast concrete floor slab gap H-shaped steel connection node of claim 1, characterized in that: and the outer side of the welded rectangular steel plate is flush with the top surface and the bottom surface of the precast concrete floor slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640803.9A CN111877621A (en) | 2020-07-06 | 2020-07-06 | Precast concrete superstructure slab joint H shaped steel connected node |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010640803.9A CN111877621A (en) | 2020-07-06 | 2020-07-06 | Precast concrete superstructure slab joint H shaped steel connected node |
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| CN111877621A true CN111877621A (en) | 2020-11-03 |
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| CN202010640803.9A Pending CN111877621A (en) | 2020-07-06 | 2020-07-06 | Precast concrete superstructure slab joint H shaped steel connected node |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115262832A (en) * | 2022-08-15 | 2022-11-01 | 四川大学 | Bolt connection assembled reinforced concrete bidirectional rib heat preservation superstructure |
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| US20120192506A1 (en) * | 2011-01-29 | 2012-08-02 | Ming-Ta King | Concrete weldment |
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| CN107905384A (en) * | 2017-11-23 | 2018-04-13 | 哈尔滨工业大学 | The bow formula dowel embedded part of assembly concrete superstructure plate face |
| CN107905423A (en) * | 2017-10-23 | 2018-04-13 | 华侨大学 | A kind of assembly concrete floor and its construction method |
| CN107975176A (en) * | 2017-11-23 | 2018-05-01 | 哈尔滨工业大学 | Assembly concrete mat formation in advance building cover board H-shaped node connector and connection method |
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2020
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Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB376308A (en) * | 1930-04-08 | 1932-07-08 | Eugene Freyssinet | Improvements in method of assembling or joining preformed building and paving elements of reinforced concrete |
| US3906694A (en) * | 1974-08-14 | 1975-09-23 | Rohr Industries Inc | Blind, riveted joint for panel members |
| JP2005330804A (en) * | 2005-06-22 | 2005-12-02 | Asahi Engineering Kk | Floor structure |
| CN101096862A (en) * | 2007-05-15 | 2008-01-02 | 广东省建筑设计研究院 | Post-pouring type deformation device and construction method thereof |
| CN201574492U (en) * | 2009-12-18 | 2010-09-08 | 东南大学 | Welded precast concrete floor slab joint connection node |
| US20120192506A1 (en) * | 2011-01-29 | 2012-08-02 | Ming-Ta King | Concrete weldment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115262832A (en) * | 2022-08-15 | 2022-11-01 | 四川大学 | Bolt connection assembled reinforced concrete bidirectional rib heat preservation superstructure |
| CN115262832B (en) * | 2022-08-15 | 2023-10-24 | 四川大学 | Bolt connection assembled reinforced concrete two-way rib heat-insulation floor system |
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Application publication date: 20201103 |