CN112609880A - Prefabricated bottom plate with cast-in-place surface and construction method - Google Patents
Prefabricated bottom plate with cast-in-place surface and construction method Download PDFInfo
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- CN112609880A CN112609880A CN202011476830.3A CN202011476830A CN112609880A CN 112609880 A CN112609880 A CN 112609880A CN 202011476830 A CN202011476830 A CN 202011476830A CN 112609880 A CN112609880 A CN 112609880A
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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
- 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
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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
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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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
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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Abstract
The invention provides a prefabricated bottom plate with a cast-in-place surface and a construction method, and belongs to the field of assembly type construction. The prefabricated bottom plate is provided with a transverse rib connecting piece through a transverse stressed steel bar which is perpendicular to the inner side of the bottom plate and is arranged on the non-cast-in-place side of the prefabricated bottom plate along the splicing edge of the prefabricated bottom plate, the transverse rib connecting piece comprises an inner side end which is welded on the adjacent transverse rib and a reserved welding end which is exposed outside the plate, the length of the transverse rib connecting piece is equal to that of the splicing edge or occupies a preset proportion of the length of the splicing edge, and the transverse rib connecting piece is uniformly distributed on the splicing; when the cast-in-place is carried out, the reserved welding ends at the edges of the two mutually spliced prefabricated bottom plates are mutually welded and connected. The invention connects the dispersed transverse ribs into a whole through the transverse rib connecting piece, so that the shearing force applied to the end part of the bottom plate is transmitted along the transverse direction and the longitudinal direction at the same time and is shared among a plurality of prefabricated bottom plates, thereby preventing shearing damage caused by overlarge shearing force, enhancing the integrity of spliced prefabricated bottom plates, improving the earthquake resistance and the shearing resistance of the floor slab, being simple and easy to operate and reducing the construction difficulty.
Description
Technical Field
The invention belongs to the field of assembly type building construction, and particularly relates to a prefabricated bottom plate with a cast-in-place surface and a construction method.
Background
With the increase of the quantity of construction projects and the improvement of quality requirements, prefabricated bottom plates are increasingly applied to building construction. The prefabricated bottom plate comprises a solid ribbed bottom plate, a hollow plate and the like which form a laminated slab with the cast-in-place layer. The fabricated floor slab is built by casting the prefabricated bottom plate in situ, so that the construction speed is high and the construction period is short. The site construction of the prefabricated bottom plate comprises assembly and pouring, wherein the prefabricated bottom plate is firstly hoisted to a corresponding position for close splicing, a leakproof mold is additionally arranged at the joint, and the site pouring is carried out after a reinforcing mesh is laid above a cast-in-place surface.
In the prior art, the construction mode of additionally arranging the supporting templates between the densely spliced prefabricated baseplates has higher requirement on the workability of concrete, and capillary holes are easy to appear to influence the mechanical property of the spliced seam.
Chinese patent application No. 202010191265.X discloses a ribbed prestressed laminated bottom plate, which comprises a concrete bottom plate, concrete ribs, reinforcing steel bars and sleeves, wherein the prefabricated bottom plate of the laminated slab is of variable cross section, the two ends of the laminated slab are bottom plate thin parts, and bottom plate thick parts are arranged in the laminated slab, the concrete ribs can be directly prefabricated with the bottom plate, or the concrete ribs can be prefabricated firstly, and then the concrete bottom plate is cast in situ. The prefabricated bottom plate is provided with transverse steel bars and longitudinal steel bars, wherein the longitudinal steel bars extend out of two sides of the prefabricated bottom plate. The thin reinforcing steel bars of the bottom plate leak outwards, during construction, the prefabricated laminated plates are closely spliced, reinforcing steel bar meshes are laid between the prefabricated plates, and then concrete is poured to form the bidirectional stress laminated slab, so that the two laminated slabs are connected to form a whole. The horizontal reinforcing bar of the thin portion of bottom plate exposes the concrete, can realize that two superimposed sheets are close to piece together and the concrete protection layer is thinner, and the fine combination of reinforcing bar of post-cast concrete with prefabricated component and the reinforcing bar of laying behind, the horizontal reinforcing bar of design is favorable to the precast concrete sheet metal to be anti to roll over and transversely to be anti to split simultaneously more. However, the joint structure and the construction process are complex, and a template support is required to be arranged at the joint when upper-layer concrete is poured, so that slurry leakage is prevented, and if the fluidity of the concrete is poor, capillary holes are easy to appear, and the problem that longitudinal steel bars are out of bars exists; if the laminated slab is ribbed, reinforcing steel bar holes need to be formed in the design of the die, so that the slurry leakage condition is easy to occur, and the quality of the component is influenced; in addition, the shear resistance between the prefabricated layer and the cast-in-place layer has certain limitation.
The chinese patent with patent number 201520247658.2 discloses a hollow slab integrated configuration of prefabricated shaped steel concrete prestressing force, including the hollow slab of prefabricated shaped steel concrete prestressing force to at the hollow slab both sides of prefabricated shaped steel concrete prestressing force cast C shaped steel, connect through C shaped steel between two adjacent hollow slabs of prefabricated shaped steel concrete prestressing force. Prefabricated shaped steel concrete prestressing force hollow slab passes through C shaped steel welded connection, also can be through C shaped steel bolted connection, its shaped steel expose in the prefabricated shaped steel concrete prestressing force hollow slab outside to improve hollow slab's wholeness and shear, anti-seismic performance, the nodal connection between the panel of being convenient for simultaneously reduces the condition emergence of board seam fracture. However, when the hollow slab is welded and connected by using the C-shaped steel, the connection and construction operation of the C-shaped steel and the hollow slab are complicated; one end of each of the two C-shaped steel is poured between the concrete, and the other end of each of the two C-shaped steel leaks outwards, so that the hoisting and transportation are difficult, and the height of the usable space of the building is reduced; the improvement of the integrity of the plate joint and the earthquake resistance and shear resistance of the composite floor slab has certain limitation.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the present invention aims to provide a prefabricated bottom plate with a cast-in-place surface and a construction method thereof, wherein a transverse bar connecting piece parallel to a longitudinal prestressed bar is welded on the edge of a transverse stressed steel bar of the cast-in-place surface of the prefabricated bottom plate, the transverse steel bar inside the prefabricated bottom plate is connected at the end part through the transverse bar connecting piece, and meanwhile, during construction, two transverse bar connecting pieces of adjacent prefabricated bottom plates are spliced together, and the reserved welding ends of the transverse bar connecting pieces of the adjacent prefabricated bottom plates are butted together for welding, so that the force transmission among the transverse stressed steel bars of different prefabricated bottom plates can be realized, the integrity of the spliced prefabricated bottom plates is enhanced, the shear stress borne by the plate blocks is shared, and meanwhile, the sealing effect on.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a prefabricated bottom plate with a cast-in-place surface, where the prefabricated bottom plate includes a longitudinal prestressed reinforcement and a transverse stressed reinforcement inside the bottom plate, and the prefabricated bottom plate further includes: the transverse rib connecting piece is arranged on the non-cast-in-place side of the prefabricated bottom plate, is vertical to a transverse stressed steel bar in the bottom plate and is arranged along the splicing edge of the prefabricated bottom plate, the transverse rib connecting piece comprises an inner side end welded on the adjacent transverse rib and a reserved welding end exposed outside the plate, and the length of the transverse rib connecting piece is equal to that of the splicing edge or occupies a preset proportion of that of the splicing edge and is uniformly distributed on the splicing edge; when the cast-in-place is carried out, the reserved welding ends at the splicing edge edges of the two mutually spliced prefabricated bottom plates are mutually welded and connected.
As a preferred embodiment of the invention, the transverse rib connecting piece is T-shaped steel, unequal limb angle steel or a steel plate;
when the transverse bar connecting piece is T-shaped steel, the longitudinal bar in the T shape is the inner side end and is embedded in the inner side of the non-cast-in-place surface, and the transverse stressed reinforcing steel bar is welded on the longitudinal bar as the inner side end; the transverse end of the T-shaped body is a reserved welding end and is attached to the splicing edge of the prefabricated bottom plate; the length of the T-shaped steel is equal to that of the splicing edge of the prefabricated bottom plate, or the T-shaped steel occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge in sections, and at least two adjacent transverse ribs are welded on the long limb of each section of unequal limb angle steel;
when the transverse bar connecting piece is an unequal limb angle steel, the long limb of the unequal limb angle steel is the inner side end and is embedded in the inner side of the non-cast-in-place surface, and the transverse stressed steel bar is welded on the long limb; the short limb is a reserved welding end, is perpendicular to a non-cast-in-place surface and is attached to the splicing edge of the prefabricated bottom plate, the length of the unequal limb angle steel is equal to that of the splicing edge of the prefabricated bottom plate, or the unequal limb angle steel accounts for a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge in sections, and at least two adjacent transverse ribs are welded on the long limb of each unequal limb angle steel;
when the transverse rib connecting piece is a steel plate, the steel plate is embedded in the prefabricated bottom plate in parallel to the non-cast-in-place surface, the transverse construction steel bars are welded at the inner side end of the steel plate, and the reserved welding ends of the steel plate extend to the edge of the splicing edge to be exposed out of the prefabricated bottom plate.
As a preferred embodiment of the invention, the prefabricated floor comprises a ribbed floor or a hollow floor for constructing a composite slab.
As a preferred embodiment of the present invention, when the prefabricated base plate is a ribbed base plate, the prefabricated base plate further includes:
longitudinal construction steel bars are arranged in ribs of the ribbed bottom plate along longitudinal two side ridges of the ribs, and two sides of each longitudinal construction steel bar do not extend out of the edge of the bottom plate; convex transverse construction steel bars are arranged along the transverse section profile of the rib and are uniformly arranged at intervals along the longitudinal direction; the longitudinal construction rebar passes through the convex apex of the transverse construction rebar.
As a preferred embodiment of the invention, when the prefabricated bottom plate is hoisted, spliced and poured on site, the short limbs of the unequal limb angle steels at the edges of the two mutually spliced prefabricated bottom plates are mutually welded and connected, and form a T shape with the long limb attached to the non-cast-in-place surface.
In a second aspect, an embodiment of the present invention further provides a construction method of a prefabricated floor slab with a cast-in-place surface, where the construction method includes:
prefabricating a prefabricated bottom plate with a cast-in-place surface, transversely stressing reinforcing steel bars perpendicular to the bottom plate on the non-cast-in-place surface side of the prefabricated bottom plate, and arranging a transverse rib connecting piece along the splicing edge of the prefabricated bottom plate, wherein the transverse rib connecting piece consists of an inner side end and a reserved welding end; the inner side ends are welded on the adjacent transverse ribs at the same time, and the reserved welding ends are exposed out of the bottom plate; the length of the transverse bar connecting piece is equal to the length of the splicing edge or occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge;
after the hoisting and splicing of the prefabricated bottom plates are completed on site, welding reserved welding ends at the splicing edge edges of the two mutually spliced prefabricated bottom plates;
and after welding, placing the integral reinforcing mesh on cast-in-place surfaces of all the prefabricated bottom plates according to the beam grids, pouring concrete, and performing cast-in-place and vibration to obtain the laminated slab.
As a preferred embodiment of the invention, the transverse rib connecting piece is an unequal limb angle steel or a steel plate;
when the base plate is prefabricated by adopting unequal limb angle steel, the long limb of the unequal limb angle steel is taken as the inner side end, the transverse construction steel bar is welded on the long limb, and the long limb is pre-embedded on the inner side of the non-cast surface of the prefabricated base plate; the short limb is a reserved welding end, the short limb is attached to the splicing edge of the prefabricated bottom plate, and the short limb is exposed to the edge of the bottom plate after the embedding is finished;
when the steel plate is adopted for prefabricating the base plate, the steel plate is embedded in the prefabricated base plate in parallel with the non-cast-in-place surface, the transverse construction steel bars are welded at the inner side end of the steel plate, and the reserved welding ends of the steel plate extend to the edge of the splicing edge to be exposed out of the prefabricated base plate.
As a preferred embodiment of the invention, when the base plate is prefabricated by adopting unequal limb angle steel, a downward groove is prefabricated on the edge of the prefabricated base plate, which is jointed with the reserved welding end; when welding before cast-in-place, welding the two reserved welding ends from the lower side through the groove;
when the bottom plate is prefabricated by adopting a steel plate, the edge of the reserved welding end is flush with the lower edge of the prefabricated bottom plate, and the upper edge does not cover the plane of the welding end; and during welding before cast-in-place, welding the exposed splicing welding end from the upper side of the prefabricated bottom plate.
As a preferred embodiment of the present invention, the mesh reinforcement is made of HRB600 steel bars.
The invention has the following beneficial effects:
the prefabricated bottom plate with the cast-in-place surface and the construction method provided by the embodiment of the invention have the advantages that the bottom plate comprises a longitudinal prestressed steel bar and a transverse stressed steel bar inside the bottom plate, and the prefabricated bottom plate further comprises the following components: the transverse rib connecting piece is arranged on the non-cast-in-place side of the prefabricated bottom plate, is vertical to a transverse stressed steel bar in the bottom plate and is arranged along the splicing edge of the prefabricated bottom plate, the transverse rib connecting piece comprises an inner side end welded on the adjacent transverse rib and a reserved welding end exposed outside the plate, and the length of the transverse rib connecting piece is equal to that of the splicing edge or occupies a preset proportion of that of the splicing edge and is uniformly distributed on the splicing edge; when the cast-in-place construction is carried out, the reserved welding ends at the splicing edge edges of the two prefabricated bottom plates which are spliced with each other are welded with each other, so that the bidirectional transmission of the shearing force in the longitudinal direction and the transverse direction is realized, the shearing force is shared between the welded prefabricated bottom plates, and the shearing damage caused by overlarge shearing force due to the fact that the plates are lapped on the beam at the plate end in the construction stage is prevented; the edge of the non-cast-in-place surface is welded together by the unequal limb angle steel to form a prefabricated bottom plate connecting structure, so that the integrity of the spliced prefabricated bottom plate is enhanced, the bearing capacity is improved, and the earthquake resistance and the shear resistance of the floor slab are improved; meanwhile, the spliced seam is sealed by welding, so that the safety of cast-in-place construction is ensured, the welding operation is simple and easy, and the construction difficulty is reduced; the constructional steel bars and the unequal limb angle steels cannot extend out of the prefabricated bottom plate, so that the construction space is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a prefabricated base slab having a cast-in-place surface according to an embodiment of the present invention;
FIG. 2 is a schematic view of the transverse bar connector of FIG. 1 being a T-section steel;
FIG. 3 is a schematic view of the transverse rib connector shown in FIG. 1 as an unequal limb angle steel;
FIG. 4 is a schematic view of the transverse bar attachment member of FIG. 1 being a steel plate;
FIG. 5 is a schematic diagram of a structure in which the prefabricated base plate is a ribbed base plate and a cast-in-place layer according to an embodiment of the present invention;
fig. 6 is a schematic view of a structure in which the prefabricated base plate is a hollow base plate and a cast-in-place layer according to another embodiment of the present invention.
Description of reference numerals:
10-prefabricating a bottom plate; 11-non-cast-in-place surface; 12-in-situ flour casting; 13-longitudinal prestressed reinforcement; 14-transverse stressed steel bars; 15-splicing edges; 16-longitudinal construction of steel reinforcement; 17-transverse constructional reinforcement; 18-a mesh reinforcement; 20-transverse bar connecting piece; 21-inward side; 22-reserving a welding end; 30-cast-in-place layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Embodiments of the present invention provide a prefabricated floor having a cast-in-place surface. As shown in fig. 1, the prefabricated base plate 10 has a non-cast-in-place surface 11 and a cast-in-place surface 12, and includes a longitudinal prestressed reinforcement 13 and a transverse stressed reinforcement 14 inside the base plate, and is characterized in that the prefabricated base plate further includes: the transverse rib connecting piece 20 is arranged on the non-cast-in-place surface side of the prefabricated bottom plate, is perpendicular to a transverse stressed steel bar in the bottom plate and is arranged along the splicing edge 15 of the prefabricated bottom plate, the transverse rib connecting piece 20 comprises an inner side end 21 welded on the adjacent transverse rib and a reserved welding end 22 exposed outside the plate, and the length of the transverse rib connecting piece 20 is equal to that of the splicing edge 13 or occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge 15; when the cast-in-place is carried out, the reserved welding ends 22 at the edges of the splicing edges 15 of the two mutually spliced prefabricated bottom plates are mutually welded and connected.
Through horizontal muscle connecting piece, with the inside horizontal reinforcing bar of prefabricated bottom plate at end connection, simultaneously when the construction, with two splices together, the reservation welding end that the horizontal muscle connecting piece butt joint of adjacent prefabricated bottom plate was in the same place welds, also can realize the transmission of power between the horizontal atress reinforcing bar of messenger's different prefabricated bottom plates. The original single prefabricated bottom plate is a one-way plate from the stress angle, and is lapped on the supporting beams at two ends during construction; the precast bottom plate bears dead weight, cast-in-place layer wet weight and construction load, transmits the load to the beam-ends again, receives the shearing force at the part of precast bottom plate overlap joint in the beam-ends, and this shearing force can only bear through the vertical prestressing steel among the precast bottom plate, when the shearing force was too big, then can cause shear failure. The shearing force that the longitudinal prestressed steel bar in the prefabricated bottom plate can bear has certain limitation, and is limited by the performance of the prestressed steel bar. According to the prefabricated bottom plate spliced together on the same beam column in a lap joint mode, the reserved welding ends are arranged in the prefabricated bottom plate, and after the spliced reserved welding ends are welded, the force borne by one prefabricated bottom plate can be distributed between the two plates, so that the bearing performance of the prefabricated bottom plate is improved. Simultaneously, the load of distribution in the bottom plate, because the horizontal muscle welding of separation originally is on same horizontal muscle connecting piece, can also further distribute between all horizontal atress reinforcing bars to further improve the load.
The transverse rib connectors 14 may be implemented by unequal limb angle steels and steel plates.
As shown in fig. 2, when the transverse bar connecting member 20 is a T-shaped steel, the longitudinal bar in the T-shape is an inner side end 21, and is pre-embedded in the inner side of the non-cast-in-place surface 11, and the transverse stressed steel bar 14 is welded to the longitudinal bar as the inner side end; the transverse end of the T-shaped structure is a reserved welding end 22 and is attached to the splicing edge of the prefabricated bottom plate; the length of the T-shaped steel is equal to the splicing edge of the prefabricated bottom plate, or the T-shaped steel occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge in sections, and at least two adjacent transverse ribs are welded on the long limb of each section of unequal limb angle steel.
As shown in fig. 3, when the transverse bar connecting member 20 is an unequal limb angle steel, the long limb of the unequal limb angle steel is an inner side end 20, which is embedded in the non-cast-in-situ surface, and the transverse stressed steel bar 14 is welded on the long limb; the short limb is for reserving weld end 22, and perpendicular, with the prefabricated bottom plate concatenation limit laminating of cast-in-place face of non-, the length of limbs angle steel is isometric with prefabricated bottom plate concatenation limit, perhaps, accounts for predetermined proportion, the segmentation evenly distributed of concatenation limit length on the concatenation edge, and the long limb of every section limbs angle steel that does not have the equal limbs at least welds has two adjacent horizontal muscle.
When the transverse rib connecting pieces are arranged in sections, each transverse rib is welded with the transverse rib connecting piece at a certain section. For example, four transverse ribs 1, 2, 3 and 4 are provided, and a section of transverse rib connecting piece is respectively arranged between 1 and 2 and between 3 and 4, and the transverse ribs connected with the transverse rib connecting pieces are welded together.
As shown in fig. 4, when the transverse rib connector 20 is a steel plate, the steel plate is embedded in the prefabricated base plate parallel to the cast-in-place surface, the transverse structural steel bar is welded to the inner end 21 of the steel plate, and the reserved welding end 22 of the steel plate extends to the edge of the splicing edge 15 and is exposed out of the prefabricated base plate.
The prefabricated bottom plate with the cast-in-place surface is used for constructing a laminated slab on a construction site. The prefabricated bottom plate comprises a ribbed prefabricated bottom plate and a hollow prefabricated bottom plate. The prefabricated floor panels 10 in fig. 2 to 4 are only schematic representations of the arrangement and connection of the transverse rib connectors.
As shown in fig. 5, the unequal limb angle steel is used as the transverse rib connecting piece 20, the transverse stressed steel bar 14 in the ribbed prefabricated bottom plate is jointed and welded with the long limb 21 of the unequal limb angle steel, and the short limb 22 of the unequal limb angle steel is jointed and welded at the outer edge of the splicing edge 15. The part below the reserved welding end 22 of the transverse rib connecting piece is in a groove shape, and the part above is poured to be flush with the reserved welding end 22 during prefabrication; when welding, the reserved welding ends 22 spliced together are welded from the groove at the lower part. When the prefabricated bottom plate is hoisted, spliced and poured on site, the unequal limb angle steel short limbs 22 at the edges of the two mutually spliced prefabricated bottom plates 10 are mutually welded and connected, and form a T-shaped structure with the long limbs attached to the non-cast-in-place surface. When pouring is carried out, the whole reinforcing mesh 18 is laid on the prefabricated bottom plate according to the beam grids, and the cast-in-situ layer 30 is poured on the cast-in-situ surface 12.
In one embodiment of the invention, as shown in fig. 5, the ribbed prefabricated base plate 10 further comprises: longitudinal construction steel bars 16 are arranged in the ribs of the ribbed bottom plate along the longitudinal two-side ridges of the ribs, and the two sides of the longitudinal construction steel bars do not extend out of the edges of the bottom plate; convex transverse construction steel bars 17 are arranged along the transverse section profile of the rib and are uniformly arranged at intervals along the longitudinal direction; the longitudinal construction rebar 16 passes through the convex apex of the transverse construction rebar 17. When pouring is carried out, the whole reinforcing mesh 18 is laid on the prefabricated bottom plate according to the beam grids, and the cast-in-situ layer 30 is poured on the cast-in-situ surface 12.
In this embodiment, a steel plate or a T-shaped steel may be used as the transverse rib connector, and the specific connection mode is the same as that of the hollow bottom plate. The following description will be made of a hollow prefabricated floor as an example, and a steel plate as a transverse rib connector.
As shown in fig. 6, when a steel plate is used as the transverse bar connector 20, the steel plate is divided into two parts in advance, wherein the transverse stressed steel bar 14 is welded on the inner side end 21, the reserved welding end 22 is flush with the edge of the prefabricated bottom plate 10 below the end head, the edge of the bottom plate above the end head is positioned on the inner side of the end head, and the upper surface of the reserved welding end 22 is exposed. When the bottom plate is prefabricated by adopting a steel plate, the edge of the reserved welding end is flush with the lower edge of the prefabricated bottom plate, and the upper edge does not cover the plane of the welding end; and during welding before cast-in-place, welding the exposed splicing welding end from the upper side of the prefabricated bottom plate. When pouring is carried out, the whole reinforcing mesh 18 is laid on the prefabricated bottom plate according to the beam grids, and the cast-in-situ layer 30 is poured on the cast-in-situ surface 12.
After the welding is finished, the cast-in-place surface is not affected, at the moment, the cast-in-place surface is cast in place, and the joints are sealed through welded unequal limb angle steels or steel plates, so that slurry leakage is prevented.
The embodiment of the invention also provides a construction method of the prefabricated bottom plate with the cast-in-place surface, which comprises the following steps:
prefabricating a prefabricated bottom plate with a cast-in-place surface, transversely stressing reinforcing steel bars perpendicular to the bottom plate on the non-cast-in-place surface side of the prefabricated bottom plate, and arranging a transverse rib connecting piece along the splicing edge of the prefabricated bottom plate, wherein the transverse rib connecting piece consists of an inner side end and a reserved welding end; the inner side ends are welded on the adjacent transverse ribs at the same time, and the reserved welding ends are exposed out of the bottom plate; the length of the transverse bar connecting piece is equal to the length of the splicing edge or occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge;
after the hoisting and splicing of the prefabricated bottom plates are completed on site, welding reserved welding ends at the splicing edge edges of the two mutually spliced prefabricated bottom plates;
and after welding, paving an integral reinforcing mesh on cast-in-place surfaces of all the prefabricated bottom plates according to the beam grids, pouring concrete, and performing cast-in-place and vibration to obtain the laminated slab.
In a specific embodiment of the invention, when the base plate is prefabricated by adopting unequal limb angle steel, a downward groove is prefabricated on the edge of the prefabricated base plate, which is jointed with the reserved welding end; when welding before cast-in-place, welding the two reserved welding ends from the lower side through the groove;
in another specific embodiment of the invention, when the bottom plate is prefabricated by adopting a steel plate, the edge of the reserved welding end is flush with the lower edge of the prefabricated bottom plate, and the upper edge does not cover the plane of the welding end; and during welding before cast-in-place, welding the exposed splicing welding end from the upper side of the prefabricated bottom plate.
Wherein, the reinforcing mesh is prepared by adopting HRB600 reinforcing steel bars.
It should be noted that the prefabricated floor construction method according to the embodiment of the present invention is related to the prefabricated floor having the cast-in-place surface, and the description of the prefabricated floor is also applicable to the prefabricated floor construction method. The construction method uses the structural characteristics of the prefabricated bottom plate and integrates the advantages of the prefabricated bottom plate into the laminated slab.
According to the technical scheme, the prefabricated bottom plate with the cast-in-place surface and the construction method provided by the embodiment of the invention have the advantages that the integrity of the spliced prefabricated bottom plate is enhanced, the bearing capacity is improved, and the earthquake resistance and the shear resistance of the floor slab are improved. Meanwhile, the spliced seam is sealed by welding, so that the safety of cast-in-place construction is ensured, the welding operation is simple and easy, and the construction difficulty is reduced; the constructional steel bars and the unequal limb angle steels cannot extend out of the prefabricated bottom plate, so that the construction space is saved.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (9)
1. The utility model provides a prefabricated bottom plate with cast in situ face, prefabricated bottom plate includes inside vertical prestressing steel of bottom plate, horizontal atress reinforcing bar, its characterized in that, prefabricated bottom plate still includes: the transverse rib connecting piece is arranged on the non-cast-in-place side of the prefabricated bottom plate, is vertical to a transverse stressed steel bar in the bottom plate and is arranged along the splicing edge of the prefabricated bottom plate, the transverse rib connecting piece comprises an inner side end welded on the adjacent transverse rib and a reserved welding end exposed outside the plate, and the length of the transverse rib connecting piece is equal to that of the splicing edge or occupies a preset proportion of that of the splicing edge and is uniformly distributed on the splicing edge; when the cast-in-place is carried out, the reserved welding ends at the splicing edge edges of the two mutually spliced prefabricated bottom plates are mutually welded and connected.
2. The precast floor slab with a cast-in-place surface according to claim 1, wherein the transverse bar connecting member is a T-shaped steel, an unequal limb angle steel or a steel plate;
when the transverse bar connecting piece is T-shaped steel, the longitudinal bar in the T shape is the inner side end and is embedded in the inner side of the non-cast-in-place surface, and the transverse stressed reinforcing steel bar is welded on the longitudinal bar as the inner side end; the transverse end of the T-shaped body is a reserved welding end and is attached to the splicing edge of the prefabricated bottom plate; the length of the T-shaped steel is equal to that of the splicing edge of the prefabricated bottom plate, or the T-shaped steel occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge in sections, and at least two adjacent transverse ribs are welded on the long limb of each section of unequal limb angle steel;
when the transverse bar connecting piece is an unequal limb angle steel, the long limb of the unequal limb angle steel is the inner side end and is embedded in the inner side of the non-cast-in-place surface, and the transverse stressed steel bar is welded on the long limb; the short limb is a reserved welding end, is perpendicular to a non-cast-in-place surface and is attached to the splicing edge of the prefabricated bottom plate, the length of the unequal limb angle steel is equal to that of the splicing edge of the prefabricated bottom plate, or the unequal limb angle steel accounts for a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge in sections, and at least two adjacent transverse ribs are welded on the long limb of each unequal limb angle steel;
when the transverse rib connecting piece is a steel plate, the steel plate is embedded in the prefabricated bottom plate in parallel to the non-cast-in-place surface, the transverse construction steel bars are welded at the inner side end of the steel plate, and the reserved welding ends of the steel plate extend to the edge of the splicing edge to be exposed out of the prefabricated bottom plate.
3. A prefabricated floor having a cast-in-place surface, according to claim 1 or 2, characterised in that it comprises a ribbed floor or a hollow floor for constituting a laminated slab.
4. The precast floor panel having a cast-in-place surface according to claim 4, wherein when the precast floor panel is a ribbed floor panel, the precast floor panel further comprises:
longitudinal construction steel bars are arranged in ribs of the ribbed bottom plate along longitudinal two side ridges of the ribs, and two sides of each longitudinal construction steel bar do not extend out of the edge of the bottom plate; convex transverse construction steel bars are arranged along the transverse section profile of the rib and are uniformly arranged at intervals along the longitudinal direction; the longitudinal construction rebar passes through the convex apex of the transverse construction rebar.
5. The prefabricated floor slab with a cast-in-place surface, according to claim 4, characterized in that when the prefabricated floor slab is hoisted, spliced and poured on site, the short limbs of the unequal limb angle steels at the edges of the two spliced prefabricated floor slabs are welded to each other to form a T-shape with the long limbs attached to the non-cast-in-place surface.
6. A construction method of a prefabricated floor panel having a cast-in-place surface, the construction method comprising:
prefabricating a prefabricated bottom plate with a cast-in-place surface, transversely stressing reinforcing steel bars perpendicular to the bottom plate on the non-cast-in-place surface side of the prefabricated bottom plate, and arranging a transverse rib connecting piece along the splicing edge of the prefabricated bottom plate, wherein the transverse rib connecting piece consists of an inner side end and a reserved welding end; the inner side ends are welded on the adjacent transverse ribs at the same time, and the reserved welding ends are exposed out of the bottom plate; the length of the transverse bar connecting piece is equal to the length of the splicing edge or occupies a preset proportion of the length of the splicing edge and is uniformly distributed on the splicing edge;
after the hoisting and splicing of the prefabricated bottom plates are completed on site, welding reserved welding ends at the splicing edge edges of the two mutually spliced prefabricated bottom plates;
and after welding, placing the integral reinforcing mesh on cast-in-place surfaces of all the prefabricated bottom plates according to the beam grids, pouring concrete, and performing cast-in-place and vibration to obtain the laminated slab.
7. The construction method of the prefabricated floor connecting structure with the cast-in-place surface according to claim 6, wherein the transverse bar connecting pieces are unequal leg angle steels or steel plates;
when the base plate is prefabricated by adopting unequal limb angle steel, the long limb of the unequal limb angle steel is taken as the inner side end, the transverse construction steel bar is welded on the long limb, and the long limb is pre-embedded on the inner side of the non-cast surface of the prefabricated base plate; the short limb is a reserved welding end, the short limb is attached to the splicing edge of the prefabricated bottom plate, and the short limb is exposed to the edge of the bottom plate after the embedding is finished;
when the steel plate is adopted for prefabricating the base plate, the steel plate is embedded in the prefabricated base plate in parallel with the non-cast-in-place surface, the transverse construction steel bars are welded at the inner side end of the steel plate, and the reserved welding ends of the steel plate extend to the edge of the splicing edge to be exposed out of the prefabricated base plate.
8. The construction method of a prefabricated floor connecting structure with a cast-in-place surface according to claim 7,
when the base plate is prefabricated by adopting unequal limb angle steel, a downward groove is prefabricated on the edge of the prefabricated base plate, which is jointed with the reserved welding end; when welding before cast-in-place, welding the two reserved welding ends from the lower side through the groove;
when the bottom plate is prefabricated by adopting a steel plate, the edge of the reserved welding end is flush with the lower edge of the prefabricated bottom plate, and the upper edge does not cover the plane of the welding end; and during welding before cast-in-place, welding the exposed splicing welding end from the upper side of the prefabricated bottom plate.
9. The construction method of a prefabricated floor connecting structure having a cast-in-place surface according to any one of claims 6 to 8, wherein said reinforcing mat is prepared using HRB600 steel bars.
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| CN202011476830.3A CN112609880A (en) | 2020-12-15 | 2020-12-15 | Prefabricated bottom plate with cast-in-place surface and construction method |
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| CN202011476830.3A CN112609880A (en) | 2020-12-15 | 2020-12-15 | Prefabricated bottom plate with cast-in-place surface and construction method |
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Application publication date: 20210406 |