CN113700153A - Connecting structure of assembled laminated slab and combination beam and construction method thereof - Google Patents
Connecting structure of assembled laminated slab and combination beam and construction method thereof Download PDFInfo
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- CN113700153A CN113700153A CN202111014879.1A CN202111014879A CN113700153A CN 113700153 A CN113700153 A CN 113700153A CN 202111014879 A CN202111014879 A CN 202111014879A CN 113700153 A CN113700153 A CN 113700153A
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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
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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
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0452—H- or I-shaped
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0465—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section square- or rectangular-shaped
Abstract
The invention provides a connecting structure and a construction method of an assembled composite slab and a composite beam, wherein the connecting structure comprises the composite slab and the composite beam, the composite slab comprises a prefabricated layer and a post-pouring layer, the prefabricated layer comprises a prefabricated bottom plate and a plurality of shear-resistant reinforcing steel bars, and the bottom ends of the shear-resistant reinforcing steel bars are anchored on the prefabricated bottom plate and exposed from the top ends of the shear-resistant reinforcing steel bars; the combination beam comprises a steel beam and a plurality of high-strength bolt groups detachably connected to the surface of the steel beam, the bottom surface of one side of the prefabricated layer is placed on the surface of the steel beam, the later-poured concrete on the prefabricated bottom plate fills the abutted seams between the steel beam and the prefabricated layer, and the high-strength bolt groups are anchored in the later-poured concrete at the abutted seams. The construction method of the connecting structure of the fabricated composite slab and the composite beam comprises the following steps: s1, producing a prefabricated layer; s2, installing the composite beam for hoisting and positioning, hoisting the prefabricated layer and placing the prefabricated layer on the steel beam; and S3, paving surface layer reinforcing steel bars, and pouring post-cast concrete to fill the abutted seams between the steel beams and the prefabricated layer. The connection structure of the laminated slab and the composite beam is reliable in stress, the steel beam is replaceable, and the construction is convenient.
Description
Technical Field
The invention belongs to the technical field of fabricated buildings, and particularly relates to a connecting structure of a fabricated composite slab and a composite beam and a construction method thereof.
Background
Compared with a cast-in-place floor slab, the composite floor slab has the advantages of few templates on site, high production efficiency, low environmental pollution, high construction speed and the like. However, the laminated floor slab also has obvious defects that the prefabricated bottom plate has low rigidity and is easy to crack during hoisting and transportation, and the application of the laminated floor slab is greatly limited. In view of this, the steel bar truss composite slab proposed in chinese patent CN201320114445.3 overcomes the above disadvantages of the composite floor slab, but has the following disadvantages: the consumption of the truss steel bars is large, only the rigidity of the prefabricated plates is improved, the influence on the stress performance of the overlapped floor slab is small, the waste of the steel bars is serious, and the cost is greatly improved. Chinese patent CN201620040756.3 proposes a composite slab with concrete ribs, which can effectively improve the rigidity of the prefabricated bottom plate, but the connection structure between the bottom plate and the ribs is complicated, and the production of the composite slab needs secondary pouring, which brings difficulty to the production of the composite slab.
The steel-concrete composite beam has the advantages of reasonable material performance utilization: it can fully exert the excellent tension performance of steel and the excellent compression performance of concrete. Therefore, the composite beam has wide application in the fields of composite floor systems and roads and bridges. When a traditional composite beam is constructed, a concrete slab of the traditional composite beam is usually constructed in a field cast-in-place mode, but the method has the disadvantages of complex form erecting and removing, low construction efficiency and great environmental pollution. Chinese patent cn201920120142.x proposes a composite beam of laminated slab, but has the following disadvantages: the prefabricated slab has low rigidity and is easy to crack during transportation and hoisting. The patent CN201910072931.5 is also a composite beam of a laminated slab, the precast slabs of which are provided with truss steel bars which can be simply regarded as convex ribs on the precast slabs, the rigidity of the precast slabs can be effectively improved, and the risk of cracking of the precast slabs during transportation and hoisting is greatly reduced; however, there are problems: the truss reinforcing steel amount is many, and the atress performance influence of pouring back composite beam to the laminated layer is less, and the reinforcing bar is extravagant serious, and the cost also promotes by a wide margin.
Therefore, it is necessary to develop a connection structure of an assembled composite slab and a composite beam and a construction method thereof, which can prevent the composite slab from cracking, reduce the amount of reinforcing steel bars, and improve the construction efficiency on the premise of ensuring the reliable strength of the connection structure.
The invention content is as follows:
the invention aims to provide a connecting structure of an assembled composite slab and a composite beam and a construction method thereof, which can avoid the cracking of the composite slab, reduce the using amount of reinforcing steel bars and improve the construction efficiency on the premise of ensuring the reliable strength of the connecting structure, so as to solve the technical problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a connecting structure of an assembled composite slab and a composite beam comprises the composite slab and the composite beam, wherein the composite slab comprises a prefabricated layer and a post-cast layer, the prefabricated layer comprises a prefabricated bottom plate and a plurality of shear steel bars, the bottom ends of the shear steel bars are anchored in the prefabricated bottom plate, the top ends of the shear steel bars are exposed out of the prefabricated bottom plate, the post-cast layer comprises post-cast concrete and surface layer steel bars, the surface layer steel bars are arranged on the upper surface of the prefabricated layer, the post-cast concrete is cast on the upper surface of the prefabricated bottom plate, and the top ends of the shear steel bars and the surface layer steel bars are anchored in the post-cast concrete; the combined beam comprises a steel beam and a plurality of high-strength bolt groups detachably connected to the steel beam, the bottom surface of one side of the prefabricated layer is placed on the steel beam, the later-poured concrete fills the spliced seam between the steel beam and the prefabricated layer, and the top ends of the high-strength bolt groups are anchored in the later-poured concrete at the spliced seam.
On the basis of the scheme, in another improved scheme, the two prefabricated layers are oppositely placed on two sides of the steel beam to form a span beam splicing seam, a plurality of additional ribs are further arranged between the two prefabricated layers, the additional ribs stretch across the span beam splicing seam, two ends of each additional rib are respectively placed on the surfaces of the two prefabricated layers, surface layer reinforcing steel bars placed on the surfaces of the two prefabricated layers are communicated to form a whole, and post-cast concrete poured on the surfaces of the two prefabricated layers is communicated to form a whole.
On the basis of the scheme, in another improved scheme, the high-strength bolt group comprises a high-strength bolt and a high-strength nut, a through hole is formed in the upper surface of the steel beam, the top end of the high-strength bolt is anchored in post-cast concrete, and the bottom end of the high-strength bolt penetrates through the through hole and then is fixed to the steel beam through the high-strength nut.
On the basis of the scheme, in another improved scheme, the section of the steel beam is an H-shaped section or a box-shaped section.
On the basis of the scheme, in another improved scheme, a plurality of high-strength bolt groups are distributed on the steel beam in two rows along the length direction.
The invention also provides a construction method of the connecting structure of the fabricated composite slab and the composite beam, which comprises the following steps:
s1, producing a prefabricated layer: laying a plurality of shear steel bars, pouring concrete of the prefabricated bottom plate, maintaining and forming, placing a plurality of detachable ribs on the upper surface of the prefabricated bottom plate, enabling the top ends of the shear steel bars to penetrate through the detachable ribs, and connecting the fixing pieces with the top ends of the shear steel bars so as to fix the detachable ribs on the prefabricated bottom plate;
s2, connecting a plurality of high-strength bolt groups on the steel beam to form a combined beam, hoisting and positioning the combined beam, hoisting the prefabricated layer by taking the detachable ribs as hoisting points and placing the prefabricated layer on the upper surface of the steel beam, and detaching the fixing piece and the detachable ribs;
s3, paving surface layer steel bars on the upper surface of the prefabricated layer, pouring post-cast concrete on the upper surface of the prefabricated layer, filling the joints between the steel beams and the prefabricated layer with the post-cast concrete, and removing the bottom template after curing and forming.
On the basis of the above scheme, in another modified scheme, the detachable ribs in the step S1 are T-shaped steel ribs, square steel tube ribs or square wood ribs, and a plurality of detachable ribs are arranged in parallel along the length direction of the prefabricated bottom plate.
On the basis of the above scheme, in another improved scheme, in the step S2, the first prefabricated layer and the second prefabricated layer are sequentially lifted and respectively placed on two sides of the upper surface of the steel beam oppositely, and the fixing pieces and the detachable ribs on the first prefabricated layer and the second prefabricated layer are removed; in the step S3, surface layer reinforcing steel bars are laid on the upper surfaces of the first prefabricated layer and the second prefabricated layer, the surface layer reinforcing steel bars cross the span beam joints, additional ribs are arranged at the span beam joints of the first prefabricated layer and the second prefabricated layer, post-cast concrete is poured on the upper surfaces of the first prefabricated layer and the second prefabricated layer, and the post-cast concrete fills the joints between the steel beam and the first prefabricated layer as well as the second prefabricated layer.
On the basis of the above scheme, in another modified scheme, the fixing member in step S1 includes a nut, the top end of the shear reinforcement bar is inserted through the detachable rib, and then the nut is screwed with the top end of the shear reinforcement bar to fix the detachable rib to the prefabricated base plate.
On the basis of the above scheme, in another improved scheme, two rows of high-strength bolts are installed on the upper surface of the steel beam in the step S2, and the high-strength bolts are fastened through high-strength nuts to form the composite beam.
The technical scheme of the invention at least has the following beneficial effects:
1. according to the connecting structure of the composite slab and the composite beam, the composite slab is simple in structure and convenient to produce, the integrity between the prefabricated layer and the post-cast layer is improved by arranging the shear-resistant reinforcing steel bars, and the shear resistance of the composite slab is also improved; the composite beam is formed by connecting a steel beam and a detachable high-strength bolt group, the production is convenient, the structure is simple and replaceable, the laminated slab is placed on the steel beam, the high-strength bolt group is anchored in a post-cast layer of the laminated slab, and the connection stress between the laminated slab and the composite beam is reliable; when the steel beam is corroded or damaged, the steel beam is taken down from the high-strength bolt group, and a new steel beam is replaced.
2. The construction method of the connection structure of the laminated slab and the composite beam has the advantages of high construction efficiency, high rigidity of the laminated slab, difficulty in cracking and low consumption of reinforcing steel bars; the prefabricated layer is provided with the detachable ribs, so that the rigidity of the prefabricated plate is obviously improved, and the prefabricated layer is not easy to crack during transportation and hoisting; the detachable ribs and the fixing pieces can be recycled, so that the energy is saved, the environment is protected, and the cost is saved; the detachable ribs are used as lifting points, and the lifting points do not need to be pre-buried additionally.
Drawings
Fig. 1 is a schematic structural view (partially cut away) of a laminated plate in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a shear reinforcement in embodiment 1 of the present invention;
fig. 3 is a perspective structural schematic view of a prefabricated layer provided with T-shaped steel ribs in embodiment 1 of the present invention;
FIG. 4 is a schematic view of the installation process of the prefabricated layer provided with the T-shaped steel rib in FIG. 3;
fig. 5 is a schematic structural view of a connection structure of a composite slab and a composite beam according to embodiment 1 of the present invention (hidden surface layer reinforcing steel bars);
fig. 6 is a vertical sectional view of a coupling structure of a laminated slab and a composite girder according to embodiment 2 of the present invention;
fig. 7 is a schematic structural diagram of a high-strength bolt set in embodiment 2 of the present invention.
The attached drawings are marked as follows:
1-laminated slab 2-prefabricated bottom plate 3-post-pouring layer
4-shear steel bar 5-post-cast concrete 6-surface steel bar
7-reinforcing steel bar mesh 8-steel beam 9-high-strength bolt group
10-combined beam 11-additional rib 12-nut
13-gasket 14-T-shaped steel rib 15-high-strength bolt
16-high-strength nut 17-first prefabricated layer 18-second prefabricated layer
Detailed Description
The following preferred embodiments of the present invention are provided to aid in a further understanding of the invention. It should be understood by those skilled in the art that the description of the embodiments of the present invention is by way of example only, and not by way of limitation.
Example 1
Referring to the schematic drawings of fig. 1 to 5, the connection structure of the fabricated composite slab 1 and the composite beam 10 in the embodiment includes a composite slab 1 and a composite beam 10, the composite slab 1 includes a prefabricated layer and a post-cast layer 3, the prefabricated layer includes a prefabricated bottom plate 2 and a plurality of shear-resistant steel bars 4, bottom ends of the plurality of shear-resistant steel bars 4 are anchored in the prefabricated bottom plate 2, top ends of the plurality of shear-resistant steel bars 4 are exposed out of the prefabricated bottom plate 2, the post-cast layer 3 includes post-cast concrete 5 and surface layer steel bars 6, the surface layer steel bars 6 are arranged on the upper surface of the prefabricated layer, the post-cast concrete 5 is poured on the upper surface of the prefabricated bottom plate 2, and top ends of the plurality of shear-resistant steel bars 4 and the surface layer steel bars 6 are anchored in the post-cast concrete 5; the composite beam 10 comprises a steel beam 8 and a plurality of high-strength bolts 15 groups 9 detachably connected to the steel beam 8, the bottom surface of one side of the prefabricated layer is placed on the steel beam 8, the later-cast concrete 5 fills the abutted seams between the steel beam 8 and the prefabricated layer, and the top ends of the high-strength bolts 15 groups 9 are anchored in the later-cast concrete 5 at the abutted seams. The both ends of the shear reinforcement 4 of superimposed sheet 1 in this embodiment anchor respectively in prefabricated layer and post-cast layer 3, have improved the wholeness between prefabricated layer and the post-cast layer 3 through setting up shear reinforcement 4, have also improved superimposed sheet 1's shear resistance.
Referring to the schematic diagram of fig. 1, on the basis of the above embodiment, in another modified embodiment, a rebar mesh 7 is anchored in the prefabricated bottom plate 2, the bottom ends of the shear reinforcements 4 are fixedly connected with the rebar mesh 7, and the top ends of the shear reinforcements 4 are perpendicular to the prefabricated bottom plate 2. Referring to the schematic diagram of fig. 2, the shear-resistant steel bars 4 in this embodiment are all L-shaped, the horizontal section is the bottom end, and the shear-resistant steel bars are bound and fixed on the steel mesh 7, and the vertical section is the top end, and extends out of the prefabricated bottom plate 2 and is anchored in the post-cast layer 3. A plurality of shear reinforcement 4 evenly distributed just are parallel to each other, have set up like this and have strengthened the joint strength between prefabricated layer and the post-cast layer 3, have improved superimposed sheet 1's shear resistance simultaneously.
On the basis of the above embodiment, in another modified embodiment, the section of the steel beam 8 is an H-shaped section or a box-shaped section. Thus, the stress performance of the steel beam 8 can be ensured, and the steel beam is not easy to bend and deform.
Referring to the schematic illustration of fig. 5, in a further improved embodiment, on the basis of the above embodiment, a plurality of high-strength bolt 15 sets 9 are distributed in two rows along the length direction on the steel beam 8. By the arrangement, the two rows of high-strength bolts 15 and the groups 9 are anchored in the concrete of the post-cast layer 3, so that the connection strength between the laminated slab 1 and the composite beam 10 is further improved, and the integrity is improved.
Referring to the schematic drawings of fig. 1 to 5, the construction method of the connection structure of the fabricated composite slab 1 and the composite girder 10 according to the present embodiment includes the steps of:
s1, producing a prefabricated layer: laying a plurality of shear steel bars 4, pouring concrete of the prefabricated bottom plate 2, maintaining and forming, mounting a plurality of detachable ribs on the upper surface of the prefabricated bottom plate 2, enabling the top ends of the shear steel bars 4 to penetrate through the detachable ribs, and fixing the detachable ribs on the prefabricated bottom plate 2 by connecting fixing pieces with the top ends of the shear steel bars 4;
s2, connecting a plurality of high-strength bolt 15 groups 9 on the steel beam 8 to form a composite beam 10, hoisting and positioning the composite beam 10, hoisting the prefabricated layer by taking the detachable ribs as hoisting points and placing the prefabricated layer on the upper surface of the steel beam 8, and detaching the fixing pieces and the detachable ribs;
s3, paving surface layer steel bars 6 on the upper surface of the prefabricated layer, pouring post-cast concrete 5 on the upper surface of the prefabricated layer, filling the abutted seams between the steel beams 8 and the prefabricated layer with the post-cast concrete 5, and removing the bottom formwork after curing and forming.
On the basis of the above embodiment, in another modified embodiment, in step S1, when the prefabricated layer is produced, the reinforcing mesh 7 is anchored in the prefabricated bottom plate 2, the reinforcing mesh 7 is laid first, then the horizontal segments of the plurality of L-shaped shear-resistant steel bars 4 are bound and fixed on the reinforcing mesh 7, and the vertical segments extend out of the prefabricated bottom plate 2.
On the basis of the above embodiment, in another modified embodiment, the detachable ribs in step S1 are T-shaped steel ribs 14 or square steel pipe ribs or square wood ribs, and a plurality of detachable ribs are arranged in parallel along the length direction of the prefabricated base plate 2.
Referring to the illustration of fig. 4, in another modified embodiment based on the above embodiment, the fixing member includes a nut 12 in S1, the top end of the shear reinforcement 4 is passed through the detachable rib, and then the nut 12 is screwed to the top end of the shear reinforcement 4 to fix the detachable rib to the prefabricated base plate 2.
Referring to the schematic of fig. 3 and 4, the detachable ribs are T-shaped steel ribs 14, and a plurality of detachable ribs are arranged in parallel along the length of the prefabricated base plate 2. The H-shaped steel can be equally cut to obtain the steel beam 8, and the material is easy to obtain and has reliable performance. A plurality of connecting holes are formed in the flange of the T-shaped steel rib 14, and the diameter of each connecting hole is larger than that of the shear steel bar 4; and a plurality of lifting holes are formed at two ends of a web plate of the T-shaped steel rib 14 and are used as lifting points of the prefabricated plate of the detachable T-shaped steel rib 14. By the arrangement, on one hand, the rigidity of the prefabricated layer in the transportation process is enhanced by the T-shaped steel ribs 14, and the prefabricated layer is not easy to crack; on the other hand, the lifting rib can be used as a lifting rib, the lifting nail does not need to be embedded additionally, the production steps are reduced, and the construction efficiency is improved.
Referring to the schematic illustration of fig. 4, in a modified example of the above embodiment, the fixing members are nuts 12 and washers 13, the vertical sections of the shear bars 4 are provided with external threads, the threaded sections of the shear bars 4 pass through the connection holes on the T-shaped steel ribs 14, then the washers 13 pass through the threaded sections, and then the nuts 12 are screwed on the threaded sections, thereby fixing the T-shaped steel ribs 14 on the prefabricated base plate 2. The installation and disassembly operations are very convenient, and the structure is simple.
In other modified embodiments, a square steel pipe rib can be used as the detachable rib, or a square wood rib can be used as the detachable rib. The square steel pipe ribs or the square wood ribs are provided with through connecting holes, the fixing pieces are nuts 12 and gaskets 13, the vertical sections of the shear steel bars 4 are provided with external threads, the thread sections of the shear steel bars 4 penetrate through the connecting holes of the square steel pipe ribs or the square wood ribs, then the gaskets 13 penetrate through the thread sections, and then the nuts 12 are screwed on the thread sections, so that the square steel pipe ribs or the square wood ribs are fixed on the prefabricated bottom plate 2. The installation and disassembly operations are very convenient, and the structure is simple. The prefabricated layer is provided with the detachable ribs, so that the rigidity of the prefabricated plate is obviously improved, and the prefabricated layer is not easy to crack during transportation and hoisting; the detachable ribs and the fixing pieces can be recycled, so that the energy is saved, the environment is protected, and the cost is saved; the detachable ribs are used as hanging points, and the hanging points do not need to be pre-buried additionally.
Example 2
Referring to the schematic diagram of fig. 6, in the connection structure of the fabricated composite slab 1 and the composite beam 10 of the present embodiment, two prefabricated layers are oppositely placed on two sides of the steel beam 8 to form a span beam joint, a plurality of additional ribs 11 are further disposed between the two prefabricated layers, the additional ribs 11 span the span beam joint, and two ends of the additional ribs are respectively placed on the surfaces of the two prefabricated layers, the surface layer steel bars 6 placed on the surfaces of the two prefabricated layers are communicated to form a whole, and the post-cast concrete 5 poured on the surfaces of the two prefabricated layers are communicated to form a whole. The first prefabricated layer 17 and the second prefabricated layer 18 are respectively placed on two opposite sides of the surface of the steel beam 8, a plurality of additional ribs 11 which are parallel to each other are placed at the splicing seams between the first prefabricated layer 17 and the second prefabricated layer 18, then the post-cast concrete 5 is uniformly cast on the upper surfaces of the first prefabricated layer 17 and the second prefabricated layer 18, the post-cast concrete 5 enters the splicing seams between the first prefabricated layer 17 and the second prefabricated layer 18, the additional ribs 11 and the surface layer steel bars 6 are anchored in the post-cast concrete 5, and the post-cast concrete 5 connects the first prefabricated layer 17, the second prefabricated layer 18 and the combination beam 10 into a whole. By the arrangement, the surface layer steel bars 6 laid on the first prefabricated layer 17 and the second prefabricated layer 18 are communicated to form a whole. In this arrangement, after the post-cast concrete 5 is poured, the first prefabricated layer 17 and the second prefabricated layer 18 form a whole; the two laminated slabs 1 and the combination beam 10 are reliably connected, and have good stress performance and good earthquake resistance.
Referring to the schematic diagram of fig. 7, on the basis of the above embodiment, in another modified embodiment, the high-strength bolt 15 set 9 includes a high-strength bolt 15 and a high-strength nut 16, a through hole is formed in the upper surface of the steel beam 8, the top end portion of the high-strength bolt 15 passes through the through hole, the bottom end of the high-strength bolt is placed in the through hole, and the high-strength nuts 16 are respectively screwed on the high-strength bolts 15 on both sides of the steel beam 8, so that the high-strength bolt 15 is fixed on the steel beam 8. After the post-cast concrete 5 is poured, the high-strength bolts 15 on the steel beam 8 are anchored in the post-cast concrete 5. In order to ensure that no slipping or displacement occurs between the high-strength bolts 15 and the steel beam 8, in other modifications, high-strength washers 13 may be placed between the high-strength nuts 16 and the steel beam 8.
Referring to the illustrations of fig. 6 to 7, the construction method of the connecting structure of the fabricated composite slab 1 and the composite girder 10 in the present embodiment is substantially the same as that in embodiment 1, except that: step S2, sequentially hoisting a first prefabricated layer and a second prefabricated layer, respectively and oppositely placing the first prefabricated layer and the second prefabricated layer on two sides of the upper surface of the steel beam 8, and removing the fixing pieces and the detachable ribs on the first prefabricated layer and the second prefabricated layer; in step S3, surface layer reinforcing steel bars 6 are laid on the upper surfaces of the first prefabricated layer and the second prefabricated layer, the surface layer reinforcing steel bars 6 cross the span beam joints, additional ribs 11 are arranged at the span beam joints of the first prefabricated layer and the second prefabricated layer 18, post-cast concrete 5 is poured on the upper surfaces of the first prefabricated layer and the second prefabricated layer, and the post-cast concrete 5 fills the joints between the steel beam 8 and the first prefabricated layer and the second prefabricated layer.
Referring to the schematic illustration of fig. 6, in the modified example of the present embodiment, in step S2, a plurality of high-strength bolt 15 sets 9 are distributed on the steel beam 8 in two rows along the length direction, and the high-strength bolts 15 are fastened by the high-strength nuts 16 to form the composite beam 10.
Adopt high strength bolt 15 group 9 and girder steel 8 to link together and form composite beam 10 in this embodiment, when composite beam 10's concrete superimposed sheet 1 takes place to damage, perhaps when girder steel 8 takes place to rust, can be through dismantling the high strength nut 16 of the flange lower surface on the girder steel 8, realize the separation of concrete superimposed sheet 1 and girder steel 8, the concrete superimposed sheet 1 or the girder steel 8 hoist and mount that will damage are demolishd, then superimposed sheet 1 or girder steel 8 are placed again, realize superimposed sheet 1 or composite beam 10's change, and is simple and convenient, therefore, the clothes hanger is strong in practicability.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims as issued or as granted.
Claims (10)
1. A connecting structure of an assembled composite slab and a composite beam is characterized by comprising the composite slab and the composite beam, wherein the composite slab comprises a prefabricated layer and a post-cast layer, the prefabricated layer comprises a prefabricated bottom plate and a plurality of shear steel bars, the bottom ends of the shear steel bars are anchored in the prefabricated bottom plate, the top ends of the shear steel bars are exposed out of the prefabricated bottom plate, the post-cast layer comprises post-cast concrete and surface layer steel bars, the surface layer steel bars are arranged on the upper surface of the prefabricated layer, the post-cast concrete is poured on the upper surface of the prefabricated bottom plate, and the top ends of the shear steel bars and the surface layer steel bars are anchored in the post-cast concrete; the combined beam comprises a steel beam and a plurality of high-strength bolt groups detachably connected to the steel beam, the bottom surface of one side of the prefabricated layer is placed on the steel beam, the later-poured concrete fills the spliced seam between the steel beam and the prefabricated layer, and the top ends of the high-strength bolt groups are anchored in the later-poured concrete at the spliced seam.
2. The structure of connecting fabricated composite slabs and composite beams as claimed in claim 1, wherein two prefabricated layers are oppositely placed on two sides of the steel beam to form a span beam joint, a plurality of additional ribs are further arranged between the two prefabricated layers, the additional ribs cross the span beam joint, two ends of the additional ribs are respectively placed on the surfaces of the two prefabricated layers, surface layer steel bars placed on the surfaces of the two prefabricated layers are communicated to form a whole, and post-cast concrete poured on the upper surfaces of the two prefabricated layers is communicated to form a whole.
3. The structure of claim 2, wherein the high-strength bolt set comprises a high-strength bolt and a high-strength nut, a through hole is formed in the upper surface of the steel beam, the top end of the high-strength bolt is anchored in post-cast concrete, and the bottom end of the high-strength bolt is fixed to the steel beam through the high-strength nut after penetrating through the through hole.
4. The structure of connecting fabricated composite slabs and composite girders according to claim 3, wherein said steel girders have an H-shaped cross-section or a box-shaped cross-section.
5. The structure of connecting fabricated composite slabs and composite girders according to claim 4, wherein a plurality of said high strength bolt groups are arranged in two rows along a length direction on said steel girders.
6. A construction method of a coupling structure of fabricated laminate slabs and composite girders according to any one of claims 1 to 5, comprising the steps of:
s1, producing a prefabricated layer: laying a plurality of shear steel bars, pouring concrete of the prefabricated bottom plate, maintaining and forming, placing a plurality of detachable ribs on the upper surface of the prefabricated bottom plate, enabling the top ends of the shear steel bars to penetrate through the detachable ribs, and connecting the fixing pieces with the top ends of the shear steel bars so as to fix the detachable ribs on the prefabricated bottom plate;
s2, connecting a plurality of high-strength bolt groups on the steel beam to form a combined beam, hoisting and positioning the combined beam, hoisting the prefabricated layer by taking the detachable ribs as hoisting points and placing the prefabricated layer on the upper surface of the steel beam, and detaching the fixing piece and the detachable ribs;
s3, paving surface layer steel bars on the upper surface of the prefabricated layer, pouring post-cast concrete on the upper surface of the prefabricated layer, filling the joints between the steel beams and the prefabricated layer with the post-cast concrete, and removing the bottom template after curing and forming.
7. The construction method of a coupling structure of fabricated composite slabs and composite girders according to claim 6, wherein the detachable ribs in the step S1 are T-shaped steel ribs or square steel pipe ribs or square wood ribs, and a plurality of detachable ribs are arranged in parallel along a length direction of the prefabricated base slab.
8. The construction method of a connecting structure of fabricated plywood and composite girder according to claim 7, wherein said step S2 is carried out by sequentially lifting a first prefabricated layer and a second prefabricated layer, and respectively placing them on both sides of the upper surface of the steel girder, and removing the fixing members and the detachable ribs on the first prefabricated layer and the second prefabricated layer; in the step S3, surface layer reinforcing steel bars are laid on the upper surfaces of the first prefabricated layer and the second prefabricated layer, the surface layer reinforcing steel bars cross the span beam joints, additional ribs are arranged at the span beam joints of the first prefabricated layer and the second prefabricated layer, post-cast concrete is poured on the upper surfaces of the first prefabricated layer and the second prefabricated layer, and the post-cast concrete fills the joints between the steel beam and the first prefabricated layer as well as the second prefabricated layer.
9. The method of constructing a coupling structure of a fabricated composite slab and a composite girder according to claim 8, wherein the fixing member includes a nut, and the detachable rib is fixed to the prefabricated base plate by passing the top end of the shear reinforcement through the detachable rib and then screwing the nut to the top end of the shear reinforcement at step S1.
10. The construction method of a connection structure of a fabricated composite slab and a composite girder according to claim 9, wherein two lines of high-strength bolts are installed on the upper surface of the steel girder and the high-strength bolts are fastened by high-strength nuts to form the composite girder in the step S2.
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