CN110778011B - Concrete precast slab, connecting structure and construction method thereof - Google Patents

Concrete precast slab, connecting structure and construction method thereof Download PDF

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Publication number
CN110778011B
CN110778011B CN201911080075.4A CN201911080075A CN110778011B CN 110778011 B CN110778011 B CN 110778011B CN 201911080075 A CN201911080075 A CN 201911080075A CN 110778011 B CN110778011 B CN 110778011B
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China
Prior art keywords
concrete
slab
precast
precast slab
support
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CN201911080075.4A
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Chinese (zh)
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CN110778011A (en
Inventor
聂建国
杨悦
陈�光
聂鑫
张猛
马云飞
樊健生
王景龙
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Tsinghua University
Sany Construction Technology Co Ltd
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Tsinghua University
Sany Construction Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/044Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/02Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/023Separate connecting devices for prefabricated floor-slabs
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/06Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Panels For Use In Building Construction (AREA)

Abstract

The present disclosure relates to the field of fabricated buildings, and provides a concrete precast slab, a connection structure and a construction method thereof. The concrete precast slab comprises a precast slab body, wherein the top surface of the precast slab body is a floor structure completion surface, and slab bottom steel bars. Wherein at least part of the edges of the precast slab body are provided with grooves for placing connecting reinforcing steel bars, and the grooves extend from the edges to the inner sides of the edges. The connection structure of the concrete precast slab and the construction method thereof are also provided, which comprises the steps of arranging the concrete precast slab and the slab support in place; connecting steel bars are placed in grooves on two sides of the plate support, and at least one part of the connecting steel bars extends out to the area where the top surface of the plate support is located; concrete is poured at least in the recess and at the top surface of the panel support.

Description

Concrete precast slab, connecting structure and construction method thereof
Technical Field
The disclosure relates to the field of fabricated buildings, in particular to a concrete precast slab, a connecting structure and a construction method thereof.
Background
Fabricated building refers to a building assembled at a worksite using prefabricated components. The building has the advantages of high building speed, less limitation of weather conditions, labor saving and high building quality. At present, in the assembled integral concrete structure, a reinforced concrete composite floor slab is generally adopted, the truss steel bars are arranged in the precast concrete floor slab, the tops of the truss steel bars are higher than the top surface of the precast floor slab, that is, the upper surface of the concrete precast floor slab is not the final finished surface of the structural floor slab, but the truss steel bars are exposed, and the truss steel bars are covered when the concrete composite layer is cast in situ, so that the integral concrete structure is formed and bears load jointly.
The cast-in-situ laminated layer on the precast concrete floor slab needs to cast a large amount of concrete on site, wet operation is more, the solidification of the laminated layer concrete needs a certain time, the support of the precast wall and other components needs to be fixed on the floor slab, the process can be carried out after the solidification of the laminated layer concrete, and the construction efficiency is low.
In general, the side surface of the precast concrete slab needs to be extended with reinforcing steel bars (Hu Zijin) to realize connection with adjacent slabs or slab supports, and the efficiency of the industrial production of the precast concrete slab is greatly reduced due to the existence of the beard ribs, and the spacing required by the beard ribs of different projects and different slabs is different, so that the reuse rate of side forms for manufacturing the precast concrete slab is low.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides the following.
According to one aspect of the present disclosure, a concrete prefabricated panel includes:
the precast slab body is formed by prefabricating concrete, and the top surface of the precast slab body is a floor slab structure finishing surface; and
the plate bottom reinforcing steel bars are arranged at the lower part of the precast slab body and are covered in the precast slab body;
at least part of the edges of the precast slab body are provided with grooves for placing connecting steel bars, and the grooves extend from the edges to the inner sides of the edges.
According to at least one embodiment of the present disclosure, the prefabricated panel body is rectangular.
According to at least one embodiment of the present disclosure, the plate bottom rebar is a rebar grid.
According to at least one embodiment of the present disclosure, the prefabricated panel body is provided at an upper portion thereof with a roof reinforcement, and the roof reinforcement is covered inside the prefabricated panel body.
According to at least one embodiment of the present disclosure, the roof reinforcement is a mesh reinforcement.
According to at least one embodiment of the present disclosure, the grooves are uniformly spaced apart at the edges of the prefabricated panel body.
According to at least one embodiment of the present disclosure, the cross section of the groove is rectangular, trapezoidal, V-shaped or gate-shaped.
According to at least one embodiment of the present disclosure, a pipeline is pre-embedded in the prefabricated panel body, and the prefabricated panel body is rectangular;
the four corners of the precast slab body are provided with enlarged grooves, and the pipelines extend into the enlarged grooves of the four corners of the precast slab body to be connected; or the pipeline extends out from the side of the prefabricated panel body to be connected.
According to at least one embodiment of the present disclosure, the inner wall of the groove is provided as an uneven surface.
According to at least one embodiment of the present disclosure, the inner wall of the groove is provided with a corrugation groove to form the rugged surface.
According to at least one embodiment of the present disclosure, the grooves have the same width or have a larger width in a direction extending from the edge to the inside of the edge to form a shape having a narrow outside and a wide inside.
According to at least one embodiment of the present disclosure, the depth of the groove is the same or the depth of the groove becomes smaller in a direction in which the groove extends from the edge to the inside of the edge.
According to at least one embodiment of the present disclosure, the bottom surface of the groove comprises a chamfer and/or a stepped surface.
According to another aspect of the present disclosure, a connection structure of a concrete precast slab and a slab supporter includes:
a plate support; and
the concrete precast slab comprises a precast slab body and slab bottom steel bars; the precast slab body is formed by precast concrete, and the top surface of the precast slab body is a floor slab structure finishing surface; the plate bottom steel bars are arranged at the lower part of the precast slab body and are covered in the precast slab body;
the two precast concrete slabs are symmetrically arranged on two sides of the slab support, grooves are formed in edges of the precast concrete slab body of each precast concrete slab, which are adjacent to the top surface of the slab support, and extend from the edge to the inner side of the edge, connecting steel bars are placed in each groove, and at least one part of each connecting steel bar extends out to the area where the top surface is located;
concrete is poured at least in the grooves and at the top surface, and the slab support and the two precast concrete slabs are connected with the poured concrete through the connecting steel bars.
According to at least one embodiment of the present disclosure, the positions of the grooves on the precast slab bodies of the two precast concrete slabs are corresponding to each other, each pair of grooves corresponding to the positions is provided with a support hogging moment steel bar, one end of the support hogging moment steel bar is located in the groove on one side, the other end of the support hogging moment steel bar spans the slab support and is located in the groove on the other side, the support hogging moment steel bar is located above the connecting steel bar, and the height of the support hogging moment steel bar is lower than that of the top surface of the precast slab body.
According to at least one embodiment of the present disclosure, the prefabricated panel body is provided at an upper portion thereof with a reinforcing mesh covered at an inside thereof and extending from one edge to the opposite other edge thereof.
According to at least one embodiment of the present disclosure, the upper part of the prefabricated slab body is provided with straight steel bars arranged at intervals in parallel; the straight reinforcing steel bars are covered in the precast slab body between two adjacent grooves, and the length of the straight reinforcing steel bars is smaller than the edge length of the precast slab body parallel to the straight reinforcing steel bars.
According to at least one embodiment of the present disclosure, the prefabricated panel body is provided with no roof reinforcement at the upper portion thereof; the length of the groove is smaller than the edge length of the precast slab body parallel to the groove.
According to at least one embodiment of the present disclosure, the height of the poured concrete is not higher than the height of the top surface of the prefabricated panel body.
According to at least one embodiment of the present disclosure, at least two connection bars are disposed in the groove, and the at least two connection bars are arranged at intervals in the same horizontal plane; or at least two support hogging moment steel bars are arranged in the groove, and the support hogging moment steel bars are arranged at intervals in the same horizontal plane.
According to another aspect of the present disclosure, a connection structure of a concrete prefabricated panel and a concrete prefabricated panel includes at least two concrete prefabricated panels including a prefabricated panel body and a panel bottom reinforcement; the precast slab body is formed by precast concrete, and the top surface of the precast slab body is a floor slab structure finishing surface; the plate bottom steel bars are arranged at the lower part of the precast slab body and are covered in the precast slab body;
the opposite edges of the precast slab bodies of two adjacent precast concrete slabs are provided with grooves, and the grooves extend from the edge to the inner side of the edge; connecting steel bars are placed in each groove, at least one part of each connecting steel bar is positioned in each groove on one side, and at least one other part of each connecting steel bar is positioned in each groove on the other side;
concrete is poured at least in the grooves, and two adjacent precast concrete boards are connected with the poured concrete through the connecting steel bars.
According to still another aspect of the present disclosure, a construction method of a connection structure of a concrete precast slab and a slab supporter includes:
setting the concrete precast slab and the slab support in place;
placing the connecting steel bars in the grooves on two sides of the plate support, and enabling at least one part of the connecting steel bars to extend out to the area where the top surface is located; and
and casting concrete at least in the grooves and at the top surface, so that the slab support and the two precast concrete slabs are connected with the cast concrete through the connecting steel bars.
According to at least one embodiment of the present disclosure, the height of the concrete poured is equal to the height of the top surface of the prefabricated panel body.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic perspective view of an exemplary concrete prefabricated panel according to the present disclosure.
Fig. 2 is a schematic top view of an exemplary concrete precast slab according to the present disclosure.
FIG. 3 is a cross-sectional view of the 1-1 position section of FIG. 2.
Fig. 4 is a schematic perspective view of a connection structure of an exemplary concrete precast slab and a slab support according to the present disclosure.
Fig. 5 is a longitudinal cross-sectional view of a connection structure of an exemplary concrete precast slab and a slab support according to the present disclosure.
Fig. 6 is a schematic perspective view of a connection structure of an exemplary concrete prefabricated panel and a concrete prefabricated panel according to the present disclosure.
Fig. 7 is a longitudinal cross-sectional view of an exemplary concrete prefabricated panel and a connection structure of the concrete prefabricated panels according to the present disclosure.
Fig. 8 is a schematic view of one embodiment of a groove in an exemplary concrete precast slab in accordance with the present disclosure.
Fig. 9a to 9d are schematic structural views of different sectional shapes of grooves in a concrete prefabricated panel of the present disclosure.
Fig. 10a to 10c are schematic views showing various embodiments of variation of the width of the grooves in the precast concrete panels of the present disclosure.
Fig. 11a and 11b are schematic views of various alternative embodiments of the bottom surface of the groove in the precast concrete slab of the present disclosure.
Fig. 12a to 12c are schematic views illustrating different arrangement manners of reinforcing bars corresponding to the top of the slab in the connection structure of the concrete precast slab of the present disclosure.
Fig. 13a and 13b are schematic views showing the arrangement of the connecting steel bars or the supporting negative moment steel bars in the grooves in the connecting structure of the concrete prefabricated panel of the present disclosure.
Fig. 14 is a schematic view of a concrete precast slab of the present disclosure employing angle steel support in construction.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The existing reinforced concrete composite floor slab needs to cast concrete on the whole prefabricated part in situ, truss steel bars are needed to be arranged at the position of the superposition surface of the cast-in-situ part and the prefabricated part, the steel content (the steel bar content in unit area) of the floor slab is obviously improved due to the existence of the truss steel bars, the construction cost of a building structure is increased, and the reinforced concrete composite floor slab becomes an important obstacle for the development of an assembled building. When in construction, a large amount of concrete needs to be poured on site, wet operation is more, and the solidification of the laminated layer concrete needs a certain time, but the support of components such as prefabricated walls and the like needs to be fixed on a floor slab, and the working procedure can be performed after the laminated layer concrete is solidified, so that the construction efficiency is low.
In addition, the efficiency of the industrialization production of the concrete precast slab part is greatly reduced by the hu-zi muscle of the concrete precast slab adopted at present, and the required interval of the hu-zi muscle of different projects and different plates is different, so that the side mould reuse rate of the concrete precast slab is low.
To solve at least one of the above-mentioned problems, according to an embodiment of the present disclosure, there is provided a concrete precast slab, referring to a schematic perspective view shown in fig. 1 and a schematic top view shown in fig. 2. The concrete precast slab comprises a precast slab body 1 and slab bottom steel bars 3. The prefabricated panel body 1 is prefabricated by pouring concrete into a mold, the shape of which is not limited herein, and may be designed into various shapes according to need, such as a general rectangle, square, and L-shape or a shape with an arc, etc. The precast slab body 1 of this disclosure is directly prefabricated according to the target thickness and the shape of floor and forms, precast slab body 1's top surface is floor structure completion face, floor structure completion face is the top surface of the structural floor who accords with reinforced concrete floor operation requirement, no longer need pour the concrete at precast slab body 1's top surface (floor structure completion face) at the job site, reduce the wet operation on site, and the concrete precast slab sets up the setting time that does not need waiting for concrete after putting in place, strutting arrangement of components such as prefabricated wall can directly support and fix on the floor, efficiency of construction has been improved.
Referring to the cross-sectional view of the 1-1 position section in fig. 2 shown in fig. 3, a plate bottom reinforcement 3 is provided inside the prefabricated plate body 1, the plate bottom reinforcement 3 is a tension reinforcement laid under the plate, the plate bottom reinforcement 3 is provided at the lower part (position close to the bottom) of the prefabricated plate body 1, the plate bottom reinforcement 3 of the present disclosure is covered inside the prefabricated plate body 1, the prefabricated plate body 1 is not protruded from the side of the prefabricated plate body 1, that is, no mustache, nor truss reinforcement is provided inside the prefabricated plate body 1. When the concrete precast slab disclosed by the application is manufactured, corresponding slab bottom steel bars 3 are arranged in the mould, and then concrete is poured into the mould to form an integral stress structure, so that the problem that the side mould recycling rate of manufacturing the concrete precast slab is low due to different spacing required by the beard ribs of different projects and different slabs is avoided, and the industrial production efficiency of the concrete precast slab is improved. The truss steel bar is not required to be arranged in the concrete precast slab, and the usage amount of the steel bar is reduced.
In order to achieve the function of connection of the hoof bars with adjacent slabs or slab supports, grooves 2 for placing connection bars 4 are provided on at least part of the edges of the prefabricated slab body 1 (edges for connection). One end of the groove 2 is arranged at the edge of the precast slab body 1, so that a notch is formed at the edge, so that the connecting steel bars 4 can extend out of the notch, the groove 2 extends from the edge to the inner side of the edge, can extend along the straight line direction, and can be in the main stress direction. If the prefabricated slab body 1 is rectangular, a strip-shaped groove 21 can be formed in the middle area of each side of the prefabricated slab body 1; grooves 22 with larger coverage areas, namely enlarged grooves, can be formed in the four corners of the precast slab body 1; for example, square grooves 22 covering the entire corner regions correspond to the reduction of the thickness of the four corners of the prefabricated panel body 1. The cross section of the groove 21 is not limited to a rectangle, and other shapes such as a V-shape, a trapezoid shape, a door opening shape, etc. may be adopted; meanwhile, the shape, width, depth and other parameters of the section can be changed along the extending length direction of the groove 21. During construction, hu Zijin is not needed, the concrete precast slabs can be conveniently hoisted, combined and the like, and after the concrete precast slabs are arranged in place, the connecting steel bars 4 can be combined with cast-in-situ concrete to form connection by placing the connecting steel bars 4 in the corresponding grooves 2 and then casting the concrete in situ in the grooves 2.
Referring to the cross-sectional form of the recess 21 shown in fig. 9a, the cross-section of the recess 21 may be rectangular, and rounded corners may be provided at the bottom corners of the rectangular recess 21. The production die with the rectangular section is simple, and the bottom corner is rounded to facilitate the detachment of the die.
Referring to the cross-sectional form of the groove 21 shown in fig. 9b, the cross-section of the groove 21 may be trapezoidal, and the width of the upper portion of the groove 21 is greater than the width of the bottom portion. The mold with the shape is slightly complex, but is convenient to disassemble and pour, and simultaneously the width of the tooth bottom and the groove top is relatively large.
Referring to the cross-sectional form of the groove 21 shown in fig. 9c, the cross-section of the groove 21 may be V-shaped, and the bottom of the V-shaped groove 21 may be slightly smoothed, e.g. rounded or flattened. The V-shaped section is adopted, the die is slightly complicated, the die is convenient to disassemble and pour, and meanwhile, the bottom of the groove 21 also has the function of reinforcing steel bar limiting.
Referring to the cross-section of the groove 21 shown in fig. 9d, the cross-section of the groove 21 may be in a door-opening shape, wherein the door-opening shape refers to a semicircular cross-section at the lower part of the groove 21, and a rectangular cross-section is arranged above the semicircular cross-section, and the two cross-sections are combined to form the door-opening shape cross-section. With this shape of section, the mold is relatively complex, but the mold is easy to remove.
Alternatively, referring to the schematic views of the different variation embodiments of the groove width shown in fig. 10a, 10b and 10c, in the direction in which the groove 21 extends from the edge of the prefabricated panel body 1 where it is located to the inside of the edge, that is, in the length direction of the groove 21, the width of the groove 21 may be set to be the same (fig. 10 a), or the width of the groove 21 at the edge of the prefabricated panel body 1 may be set to be smaller than the width of the groove 21 at the inside of the edge to form an inverted wedge shape having a narrow outside and a wide inside. May be gradually widened (fig. 10 b) or may be widened over a portion of the length inside the edge (fig. 10 c). The inverted wedge-shaped groove 21 with the outer narrow and the inner wide is adopted, so that the inverted wedge-shaped concrete is formed in the groove after casting, the anchoring effect is enhanced, and the groove with the shape can possibly cancel the connecting steel bars put in the groove after casting, and the connection between prefabrication and cast-in-situ is realized directly by the concrete.
Alternatively, see the schematic diagrams of different variant embodiments of the groove bottom surface shown in fig. 11a and 11 b. The depth of the groove 21 may be set to be the same in the direction in which the groove 21 extends from the edge of the prefabricated panel body 1 where it is located to the inside of the edge, that is, in the length direction of the groove 21, or the depth of the groove 21 at the edge of the prefabricated panel body 1 may be set to be greater than the depth of the groove 21 inside the edge, that is, the depth of the groove 21 becomes smaller from the outside to the inside. For example, the bottom surface of the groove may include a slope or a stepped surface that gradually slopes from the inside to the outside, or may include both the slope and the stepped surface. The effect of the reduced depth of the grooves from the outside to the inside is that the length of the lower connecting bars is shorter and the length of the upper connecting bars is longer. In addition, the mode can reduce the amount of post-cast concrete on site, and the shallower the groove is, the easier the demolding is, and the more convenient the production is.
Alternatively, the inner wall of the groove 2 may be provided with an uneven surface, such as a schematic view of an embodiment of the groove shown in fig. 8, in which the inner wall of the groove 2 is provided with a corrugation 21, so that the inner wall of the groove 2 forms a corrugated surface, to increase the contact area with the post-cast concrete after casting the concrete in the groove 2, and to increase the connection force and the firmness. The inner wall of the groove 2 may be provided with a plurality of recesses or a plurality of projections, and the structure is not particularly limited as long as the surface of the inner wall of the groove 2 is formed to be uneven.
In an alternative embodiment of the present disclosure, the upper portion (a position near the top) of the prefabricated panel body 1 may be provided with a roof bar (may also be referred to as a roof through bar) connected by a hogging moment bar placed at a slot or a panel support by a slotting portion, and the roof bar is covered inside the prefabricated panel body 1 without extending the prefabricated panel body 1 from the side of the prefabricated panel body 1, i.e., without a hoof bar. The steel bars at the top of the plate are arranged at the upper part of the plate, and mainly bear hogging moment and prevent the cracking of the plate surface. When the precast concrete slab is manufactured, slab bottom steel bars 3 and slab top steel bars are paved in a mould, and then concrete is poured into the mould. In the case of simultaneously providing the plate bottom reinforcement 3 and the plate top reinforcement, the groove 2 provided at the edge of the prefabricated plate body 1 needs to simultaneously avoid the plate bottom reinforcement 3 and the plate top reinforcement.
The plate bottom steel bars 3 or the plate top steel bars can be formed by adopting a plurality of steel bars which are arranged in parallel and at intervals in the same horizontal plane, the directions of the plate bottom steel bars 3 and the plate top steel bars can be the same or mutually perpendicular, and alternatively, the plate bottom steel bars 3 and the plate top steel bars can both adopt a steel bar net or one of the steel bar nets, and the other steel bar net or the other steel bar net adopts other forms. The steel bar net is made of longitudinal and transverse steel bars which are crossed and bound or welded, and is a plane structure. The reinforcing mesh can improve the quality of the reinforcing engineering, the construction speed and the crack resistance of the concrete.
In an alternative embodiment of the present disclosure, the prefabricated panel body 1 may have a rectangular shape. Optionally, the grooves 2 are uniformly spaced on the whole edge of the prefabricated slab body 1, that is, the four edges of the prefabricated slab body 1 are provided with a plurality of grooves 2, the plurality of grooves 2 are distributed along the length direction of each edge, the extending direction of the grooves 2 is perpendicular to the edge where the grooves 2 of one group of opposite edges are perpendicular to the extending direction of the grooves 2 of the other group of opposite edges, the four corners of the prefabricated slab body 1 are provided with square grooves 2 covering the whole corner area, and the arrangement mode is suitable for boards with bidirectional connection, that is, the boards need to be connected in two perpendicular directions. However, the present disclosure is not limited thereto, and the grooves 2 may be provided only at one set of two opposite edges, i.e., opposite edges, which is suitable for the plates to be connected unidirectionally, i.e., only in one direction.
In an alternative embodiment of the present disclosure, a pipeline (not shown in the drawings) is pre-buried inside the prefabricated panel body 1, and the prefabricated panel body 1 is provided in a rectangular shape. The concrete precast slabs are spliced into a whole on site, and pipelines in each precast slab are required to be connected on the construction site. The connection of the pipelines means that concrete is poured after the pipelines are connected on site, so the connection of the pipelines needs to be performed at places where the post-pouring concrete exists. According to different connection positions, the following two different implementation structures are provided.
The first way is: the four corners of prefabricated plate body 1 are provided with recess 2, and recess 2 can cover whole bight region to make the thickness reduction of four bight of prefabricated plate body 1, the pipeline of embedding in the prefabricated plate body 1 stretches out in the recess 2 of four bights of prefabricated plate body 1, because there is post-cast concrete in recess 2, consequently can connect at recess 2, then pour concrete.
The second way is: the pipeline embedded in the precast slab body 1 extends out from the side surface of the precast slab body 1, and as the beam matched with the precast slab is provided with the position of the overlapped layer, post-pouring concrete is arranged at the position of the overlapped layer, the pipeline extending out from the side surface of the precast slab body 1 can be connected at the position of the overlapped layer, and then the concrete is poured.
The disclosure also provides a connection structure of the precast concrete slab and the slab support, which is shown in a schematic perspective structure of the connection structure in fig. 4 and a longitudinal section cross-sectional view of the connection structure in fig. 5. The connecting structure comprises a slab support 6 and two precast concrete slabs. The panel support 6 may be a beam or a wall or the like for supporting a floor. The plate carrier 6 has a flat top surface, and the plate carrier 6 may extend in a straight line or in a curved line. In one embodiment, the top surface of the plate carrier 6 may be provided with upwardly extending beam stirrups 7, the beam stirrups 7 acting mainly as beam shears. The concrete precast slab adopts the concrete precast slab disclosed by the disclosure and comprises a precast slab body 1 and slab bottom steel bars 3; the precast slab body 1 is formed by concrete prefabrication, and the top surface of the precast slab body 1 is a floor slab structure completion surface. The plate bottom reinforcing steel bars 3 are arranged at the lower part of the precast slab body 1 and are covered inside the precast slab body 1.
Wherein, two concrete prefabricated slabs are symmetrically arranged at two sides of the slab support 6, and can be fixed by hoisting and a bracket during construction. The edges of the precast slab body 1 of the first concrete precast slab adjacent to the top surface of the slab support 6 and the edges of the precast slab body 1 of the second concrete precast slab adjacent to the top surface of the slab support 6 are provided with grooves 2, the grooves 2 extend from the edges to the inner sides of the edges, connecting steel bars 4 are placed in each groove 2, and at least one part of the connecting steel bars 4 extends out to the area where the top surface of the slab support 6 is located. The top surface of the panel support 6 is not higher than the bottom surface of the groove 2, and since the edge of the prefabricated panel body 1 is adjacent to the top surface of the panel support 6, the connecting steel bar 4 can be located above the top surface of the panel support 6 as long as the connecting steel bar 4 extends out of the groove 2, and thus extends out to the area where the top surface of the panel support 6 is located. The arrangement of the connecting bars 4 can be in two ways:
firstly, two connecting steel bars 4 are arranged in a pair of grooves 2 corresponding to each other, the first connecting steel bars 4 are arranged in the grooves 2 of the first concrete precast slab, and the other ends of the connecting steel bars extend out of the area where the top surfaces of the slab supports 6 are positioned; the second connecting steel bar 4 is placed in the groove 2 of the second concrete precast slab, and the other end extends out to the area where the top surface of the slab support 6 is located.
Secondly, a connecting steel bar 4 is placed in the pair of grooves 2 corresponding to the positions, one end of the connecting steel bar 4 is located in the groove 2 of the first concrete precast slab, the other end stretches into the groove 2 of the second concrete precast slab across the area where the top surface of the slab support 6 is located, and the part of the connecting steel bar 4 which stretches across the top surface of the slab support 6 is located in the area where the top surface of the slab support 6 is located.
Concrete is poured at least in the grooves 2 and at the top surface of the slab support 6, and the slab support 6 and the two precast concrete slabs are connected with the poured concrete through the connecting steel bars 4.
The precast concrete slab that this connection structure adopted is directly prefabricated according to the target thickness and the shape of floor and forms, and the top surface of precast slab body 1 is floor structure completion face, no longer need pour the concrete at the top surface of precast slab body 1 at the job site, reduces the wet operation on site to the precast concrete slab sets up the setting time of waiting for the concrete after putting in place, and the strutting arrangement of precast wall etc. components can directly support and fix on the floor, has improved the efficiency of construction. In addition, the concrete precast slab does not have Hu Zijin during construction, and the concrete precast slab can be conveniently hoisted, combined and other operations, so that the construction mode is more flexible.
In an alternative embodiment of the present disclosure, the positions of the grooves 2 on the prefabricated panel body 1 of the first concrete prefabricated panel and the positions of the grooves 2 on the prefabricated panel body 1 of the second concrete prefabricated panel correspond to each other, that is, the extending directions of the pair of grooves 2 corresponding to the positions of both sides of the panel support 6 are on the same straight line. And each pair of grooves 2 corresponding to the positions are internally provided with a support hogging moment steel bar 5, and the support hogging moment steel bar 5 is a steel bar bearing tensile force generated by the hogging moment at the support position of the plate. One end of the support hogging moment steel bar 5 is positioned in the groove 2 on one side, the other end of the support hogging moment steel bar 5 spans the plate support 6 and is positioned in the groove 2 on the other side, the support hogging moment steel bar 5 is positioned above the connecting steel bar 4, and the support hogging moment steel bar 5 can be arranged in the groove 2 after the connecting steel bar 4 is placed in the groove 2 during construction. Because concrete needs to be poured into the grooves 2 and the top surface areas of the slab supports 6, the connecting steel bars 4, the beam stirrups 7 (if provided) and the support hogging moment steel bars 5 are buried into cast-in-place concrete, the surface of the poured concrete needs to be leveled with the top surface of the precast slab body 1, and concrete does not need to be poured again to the top surface of the precast slab body 1. The height of the support hogging moment steel bars 5 is lower than the height of the top surface of the precast slab body 1; if the beam stirrup 7 is provided, the height of the beam stirrup 7 should also be lower than the height of the top surface of the prefabricated panel body 1.
Alternatively, referring to fig. 12a, the slab top reinforcement of the concrete precast slab is schematically represented in the form of a reinforcing mesh. The upper portion of the prefabricated panel body 1 is provided with a reinforcing mesh 81, and the reinforcing mesh 81 is covered inside the prefabricated panel body 1 and extends from one edge of the prefabricated panel body 1 to the opposite other edge. In fig. 12a, the prefabricated panel body 1 has a rectangular shape, the reinforcing mesh 81 extends in the length and width directions of the entire prefabricated panel body 1, and the reinforcing bars of the reinforcing mesh 81 extend from one edge to the opposite other edge. The groove 2 extends in the direction perpendicular to the edge, the connecting steel bar 4 is placed at the lower part in the groove 2, and the support hogging moment steel bar 5 is placed above the connecting steel bar 4 at the upper part in the groove 2. In this embodiment, the length of the groove 2 may be set to the length of the lap joint of the reinforcing bars, and the reinforcing mesh 81 may be produced by a welding machine, which is convenient to produce.
Alternatively, referring to fig. 12b, the slab top reinforcement of the concrete precast slab is schematically represented in the form of straight reinforcement. Straight steel bars 82 arranged at intervals in parallel are arranged at the upper part of the precast slab body 1; the straight reinforcing bars 82 are covered inside the prefabricated panel body 1 between two adjacent grooves 2, and the length of the straight reinforcing bars 82 is smaller than the edge length of the prefabricated panel body 1 parallel thereto, and the length of the grooves 2 of the prefabricated panel body 1 is generally not smaller than 1/4 of the short span (i.e., the shortest side length) of the prefabricated panel body 1. Alternatively, when the diameter of the connecting bar 4 placed in the groove 2 is larger than the diameter of the design bar, the length of the groove 2 may be appropriately shortened. In fig. 12b, the prefabricated panel body 1 is rectangular, and the length of the straight reinforcing steel bars 82 extending inward from the edge of the prefabricated panel body 1 is 1/4 of the short span of the prefabricated panel body 1. The groove 2 extends in the direction perpendicular to the edge, the connecting steel bar 4 is placed at the lower part in the groove 2, and the support hogging moment steel bar 5 is placed above the connecting steel bar 4 at the upper part in the groove 2. In this embodiment, the length of the groove 2 can be only set to the overlapping length of the steel bars, the length of the straight steel bars 82 is short, the die cost is saved, and the molding difficulty is reduced.
Alternatively, referring to fig. 12c, a concrete prefabricated panel is shown without a schematic view of the roof reinforcement. The upper part of the precast slab body 1 is not provided with slab top reinforcing steel bars; the length of the groove 2 is smaller than the edge length of the precast slab body parallel to the groove, and the length of the groove 2 of the precast slab body 1 is generally not smaller than 1/4 of the short span of the precast slab body 1. Alternatively, when the diameter of the connecting bar 4 placed in the groove 2 is larger than the diameter of the design bar, the length of the groove 2 may be appropriately shortened. In fig. 12c, the prefabricated slab body 1 is rectangular, the groove 2 extends in the direction vertical to the edge, the connecting steel bar 4 is placed at the lower part in the groove 2, and the support hogging moment steel bar 5 is placed at the upper part in the groove 2 above the connecting steel bar 4. In this way, the length of the groove 2 needs to meet the requirement of the length of the support steel bar, so the length of the groove 2 is longer, but the consumption of steel bar materials is low.
Optionally, according to the requirements of the construction process, the height of the poured concrete can be lower than the height of the top surface of the precast slab body 1, and then the surface of the poured concrete is leveled with the top surface of the precast slab body 1 through other processes.
Optionally, referring to fig. 13a and 13b, a schematic diagram of a setting mode of connecting steel bars in a groove or supporting negative bending moment steel bars in a connecting structure of a concrete precast slab is shown, in the connecting structure of the concrete precast slab and a slab supporting seat, at least two connecting steel bars may be arranged in the groove 2, and at least two connecting steel bars are arranged at intervals in the same horizontal plane. Fig. 13a shows a case where the groove width of the groove 2 is small, the groove width is 150mm-200mm, and two connecting bars are respectively arranged at two sides in the groove 2. Fig. 13b shows a case where the groove width of the groove 2 is large, the groove width is 200mm-250mm, and two connecting bars are respectively arranged at two sides in the groove 2. Similarly, at least two support hogging moment steel bars 5 can be arranged in the groove 2, and the at least two support hogging moment steel bars 5 are arranged at intervals in the same horizontal plane. In the case where the support hogging moment steel bars 5 are provided, fig. 13a and 13b are plan views seen from the top down, and since the connection steel bars are located right under the support hogging moment steel bars 5, they are not shown, the width of the groove 2 and the arrangement positions of the two support hogging moment steel bars 5 are the same as those of the two connection steel bars.
The present disclosure also provides a connection structure of a concrete prefabricated panel and a concrete prefabricated panel, referring to a schematic perspective structure of the connection structure shown in fig. 6 and a longitudinal section cross-sectional view of the connection structure shown in fig. 7. The connecting structure comprises at least two concrete precast slabs, wherein the concrete precast slabs adopt the concrete precast slabs of the present disclosure, and the connecting structure comprises a precast slab body 1 and slab bottom steel bars 3. The precast slab body 1 is formed by concrete prefabrication, and the top surface of the precast slab body 1 is a floor slab structure completion surface. The plate bottom reinforcing steel bars 3 are arranged at the lower part of the precast slab body 1 and are covered inside the precast slab body 1.
Among two adjacent concrete precast slabs, the edge of the precast slab body 1 of the first concrete precast slab and the edge of the precast slab body 1 of the opposite second concrete precast slab are both provided with grooves 2, and the grooves 2 extend from the edge to the inner side of the edge. The grooves 2 on the first concrete prefabricated panel correspond to the grooves 2 on the second concrete prefabricated panel in position, that is, the extending directions of the pair of grooves 2 corresponding in position are on the same straight line. Connecting bars 4 are placed in each groove 2, at least one part of the connecting bars 4 is positioned in the groove 2 on one side, and at least another part of the connecting bars 4 is positioned in the groove 2 on the other side. The arrangement of the connecting bars 4 may be in the following ways:
firstly, two connecting steel bars 4 are arranged in a pair of grooves 2 corresponding to each other, the first connecting steel bars 4 are arranged in the grooves 2 of the first concrete precast slab, and the other ends of the connecting steel bars extend into the grooves 2 of the second concrete precast slab; the second connecting steel bar 4 is placed in the groove 2 of the second concrete precast slab, and the other end extends into the groove 2 of the first concrete precast slab.
Second, a connecting bar 4 is placed in a pair of grooves 2 corresponding to the positions, one end of the connecting bar 4 is located in the groove 2 of the first concrete precast slab, and the other end extends into the groove 2 of the second concrete precast slab.
Concrete is poured at least in the grooves 2, and two adjacent precast concrete slabs are connected with the poured concrete through connecting steel bars 4.
The precast concrete slab that this connection structure adopted is directly prefabricated according to the target thickness and the shape of floor and forms, and the top surface of precast slab body 1 is floor structure completion face, no longer need pour the concrete at the top surface of precast slab body 1 at the job site, reduces the wet operation on site to the precast concrete slab sets up the setting time of waiting for the concrete after putting in place, and the strutting arrangement of precast wall etc. components can directly support and fix on the floor, has improved the efficiency of construction. In addition, the concrete precast slab does not have Hu Zijin during construction, and the concrete precast slab can be conveniently hoisted, combined and other operations, so that the construction mode is more flexible.
The present disclosure also provides a construction method of a connection structure of a concrete precast slab and a slab support 6, the construction method including:
setting the concrete precast slab and slab support 6 in place; the two precast concrete slabs may be aligned along the extension direction of the top surface of the slab support 6 by means of a hoisting and supporting means, respectively, and symmetrically fixed to both sides of the slab support 6.
The construction method for setting the concrete precast slab in place can adopt a mode of setting vertical supports at the bottom of the slab, and optionally, the slab support 6, such as angle steel and the like, can also be directly arranged on a slab support 6, such as a wall or a beam to support a floor slab, thereby eliminating the installation of the vertical supports and improving the construction efficiency. Referring to fig. 14, the concrete precast slab of the present disclosure adopts a schematic view of angle steel support in construction, and adopts an angle steel 31 form to support the concrete precast slab, wherein an upper end surface of the angle steel 31 supports the concrete precast slab, and the other end surface of the angle steel 31 is fixedly connected to the slab support 6 through bolts, and by the above supporting method of the angle steel 31, a step of installing a large number of vertical supports can be omitted, thereby reducing labor, improving efficiency and saving manufacturing cost.
Placing connecting steel bars 4 in the grooves 2 on two sides of the plate support 6, and enabling at least one part of the connecting steel bars 4 to extend out to the area where the top surface of the plate support 6 is located; the connecting steel bar 4 can adopt the two setting modes, and is not repeated here; and
concrete is poured at least in the grooves 2 and at the top surface of the slab support 6, so that the slab support 6 and the two precast concrete slabs are connected with the poured concrete through the connecting steel bars 4. In casting, the required auxiliary templates can be arranged on the connecting structure to limit the concrete to the required range.
The height of the poured concrete may be equal to the height of the top surface of the prefabricated slab body 1, which allows the connection reinforcing bars 4 to be covered with the cast-in-place concrete, so that the top surface of the entire connection structure forms a floor structure finish surface. If provided, the beam stirrups 7 are also covered by cast-in-place concrete.
Alternatively, the height of the concrete poured in situ can be lower than the height of the top surface of the precast slab body 1, corresponding treatment is carried out according to engineering requirements, and then the top surface of the whole connecting structure is formed into a floor structure finished surface through other processes.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.

Claims (15)

1. A concrete precast slab, comprising:
the precast slab body is formed by prefabricating concrete, and the top surface of the precast slab body is a floor slab structure finishing surface; and
the plate bottom reinforcing steel bars are arranged at the lower part of the precast slab body and are covered in the precast slab body;
at least part of the edges of the precast slab body are provided with grooves for placing connecting steel bars, and the grooves extend from the edges to the inner sides of the edges;
the cross section of the groove is rectangular, trapezoidal, V-shaped or gate-shaped;
pipelines are pre-buried in the precast slab body, and the precast slab body is rectangular;
the four corners of the precast slab body are provided with enlarged grooves, and the pipelines extend into the enlarged grooves of the four corners of the precast slab body to be connected; or the pipeline extends out from the side surface of the precast slab body to be connected;
the inner wall of the groove is provided with a corrugated groove so as to form an uneven surface;
the grooves are uniformly distributed at intervals on the edge of the precast slab body;
the width of the grooves is the same or the width of the grooves in the direction extending from the edge to the inner side of the edge is increased to form a shape with a narrow outside and a wide inside.
2. A precast concrete panel as recited in claim 1, wherein the panel bottom reinforcement is a mesh reinforcement.
3. A precast concrete slab as recited in claim 2, wherein an upper portion of the precast slab body is provided with a slab top reinforcing bar, and the slab top reinforcing bar is covered inside the precast slab body.
4. A precast concrete panel as recited in claim 3, wherein the roof reinforcement is a mesh reinforcement.
5. A precast concrete panel as claimed in any one of claims 1 to 4, wherein the depth of the grooves is the same or the depth of the grooves becomes smaller in a direction extending from the edge where it is located to the inside of the edge where it is located.
6. A precast concrete panel as claimed in claim 5, in which the floor of the recess includes a sloping surface and/or a stepped surface.
7. A connection structure of a concrete precast slab and a slab supporter as recited in claim 1, comprising:
a plate support; a concrete precast slab;
the two precast concrete slabs are symmetrically arranged on two sides of the slab support, the edges of the precast concrete slab body of each precast concrete slab adjacent to the top surface of the slab support are provided with grooves, the grooves extend from the edge to the inner side of the edge, connecting steel bars are arranged in each groove, and at least one part of each connecting steel bar extends out to the area where the top surface of the slab support is located;
concrete is poured at least in the grooves and at the top surface of the slab support, and the slab support and the two precast concrete slabs are connected with the poured concrete through the connecting steel bars.
8. A connection structure of a concrete precast slab and a slab support according to claim 7, wherein positions of the grooves on the precast slab bodies of the two precast concrete slabs are mutually corresponding, each pair of the grooves corresponding to the positions is internally provided with a support hogging moment steel bar, one end of the support hogging moment steel bar is positioned in the groove on one side, the other end of the support hogging moment steel bar spans the slab support and is positioned in the groove on the other side, the support hogging moment steel bar is positioned above the connecting steel bar, and the height of the support hogging moment steel bar is lower than that of the top surface of the precast slab body.
9. A connection structure of a concrete prefabricated panel and a panel support according to claim 8, wherein the prefabricated panel body is provided at an upper portion thereof with a reinforcing mesh which is covered inside the prefabricated panel body and extends from one edge to the opposite other edge of the prefabricated panel body.
10. A connection structure of a concrete precast slab and a slab support according to claim 8, wherein straight reinforcing bars arranged at parallel intervals are arranged at the upper part of the precast slab body; the straight reinforcing steel bars are covered in the precast slab body between two adjacent grooves, and the length of the straight reinforcing steel bars is smaller than the edge length of the precast slab body parallel to the straight reinforcing steel bars.
11. A connection structure of a concrete precast slab and a slab support according to claim 8, wherein a slab top reinforcing bar is not provided at an upper portion of the precast slab body; the length of the groove is smaller than the edge length of the precast slab body parallel to the groove.
12. A connection structure of a concrete prefabricated panel and a panel support according to any one of claims 7 to 11, wherein the height of the poured concrete is not higher than the height of the top surface of the prefabricated panel body.
13. A connection structure of a concrete precast slab and a slab support according to any one of claims 8 to 11, wherein at least two connection bars are arranged in the groove, and the connection bars are arranged at intervals in the same horizontal plane; or at least two support hogging moment steel bars are arranged in the groove, and the support hogging moment steel bars are arranged at intervals in the same horizontal plane.
14. A method of constructing a connection structure of a concrete precast slab and a slab supporter as recited in claim 7, comprising:
setting the concrete precast slab and the slab support in place;
placing the connecting steel bars in the grooves on two sides of the plate support, and enabling at least one part of the connecting steel bars to extend out to the area where the top surface is located; and
and casting concrete at least in the grooves and at the top surface, so that the slab support and the two precast concrete slabs are connected with the cast concrete through the connecting steel bars.
15. A method of constructing a concrete precast slab and slab support connection structure of claim 14, wherein the height of the concrete is equal to the height of the top surface of the precast slab body.
CN201911080075.4A 2019-11-07 2019-11-07 Concrete precast slab, connecting structure and construction method thereof Active CN110778011B (en)

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