CN110847467B - Composite prefabricated floor slab and construction method thereof - Google Patents
Composite prefabricated floor slab and construction method thereof Download PDFInfo
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- CN110847467B CN110847467B CN201911129543.2A CN201911129543A CN110847467B CN 110847467 B CN110847467 B CN 110847467B CN 201911129543 A CN201911129543 A CN 201911129543A CN 110847467 B CN110847467 B CN 110847467B
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- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 85
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 239000000758 substrate Substances 0.000 claims description 33
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000011178 precast concrete Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims 1
- 239000011150 reinforced concrete Substances 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000011065 in-situ storage Methods 0.000 description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011120 plywood Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 210000000003 hoof Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
本公开提供了一种叠合预制楼板,包括基板、叠置在基板顶面的层板以及设置在基板的板底钢筋。基板和层板均由混凝土预制形成；层板与基板接触的面积小于基板的面积，且层板的顶面为楼板结构完成面；板底钢筋被覆盖在基板的内部。其中，基板未与层板接触的区域形成混凝土现浇区。本公开的叠合预制楼板的楼板结构完成面是符合钢筋混凝土楼板使用要求的结构楼板面，在施工现场不需要再在层板的顶面浇筑混凝土即可满足设计所需的结构楼板厚度，减少现场的湿作业，提高了施工效率。
The present disclosure provides a composite prefabricated floor slab, comprising a base plate, a layer plate stacked on the top surface of the base plate, and a bottom plate steel bar arranged on the base plate. The base plate and the layer plate are both prefabricated with concrete; the area where the layer plate contacts the base plate is smaller than the area of the base plate, and the top surface of the layer plate is the finished surface of the floor slab structure; the bottom plate steel bar is covered inside the base plate. Among them, the area where the base plate does not contact the layer plate forms a cast-in-place concrete area. The finished surface of the floor slab structure of the composite prefabricated floor slab disclosed in the present disclosure is a structural floor slab surface that meets the use requirements of reinforced concrete floor slabs. At the construction site, it is not necessary to cast concrete on the top surface of the layer plate to meet the structural floor slab thickness required by the design, thereby reducing wet work on site and improving construction efficiency.
Description
Technical Field
The disclosure relates to the field of assembled buildings, in particular to a superposed prefabricated floor slab 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, and the method is that truss steel bars are arranged on the upper surface (not the finishing surface of the floor slab structure) of a concrete precast slab, and the truss steel bars are covered by a cast-in-place concrete composite layer, so that the integral concrete structure is formed and bears load together. The truss steel bar is arranged to increase the steel content and increase the cost.
The cast-in-situ laminated layer on the precast concrete floor slab needs to pour a large amount of concrete on site, wet operation is more, the solidification of the laminated layer concrete needs a certain time, the supporting device of the prefabricated 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 concrete precast 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 concrete precast 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 side mold recycling rate of the concrete precast 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 composite precast floor slab includes:
A base plate prefabricated by concrete;
a laminate prefabricated from concrete on the top surface of the base plate, the contact area of the laminate and the base plate being smaller than the area of the base plate, the top surface of the laminate being a floor structure completion surface, and
The plate bottom steel bars are arranged on the base plate and are covered in the base plate;
wherein, the area of the base plate which is not contacted with the laminate forms a concrete cast-in-place area.
According to at least one embodiment of the present disclosure, at least a portion of the edge of the base plate is provided with a groove for placing a connecting bar, the groove extending from the edge to the inside of the edge.
According to at least one embodiment of the present disclosure, the laminate is provided with roof bars, and the roof bars are covered on the inside of the laminate.
According to at least one embodiment of the present disclosure, at least part of the edges of the laminate are provided with the grooves for placing the connecting bars, which grooves extend from the edge to the inside of the edge.
According to at least one embodiment of the present disclosure, the plate bottom rebar and/or the plate top rebar are a rebar grid.
According to at least one embodiment of the present disclosure, the thickness of the substrate at the bottom of the groove ranges from 20mm to 60mm, and the total thickness of the substrate and the laminate is not less than 80mm.
According to at least one embodiment of the present disclosure, the cross-sectional shape of the groove is rectangular, trapezoidal, V-shaped, semicircular, or door opening.
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 at least one embodiment of the present disclosure, a pipeline is embedded in the substrate, and the substrate is rectangular;
The four corners of the base plate are provided with enlarged grooves into which the lines extend for connection, or the lines extend from the sides of the base plate for connection.
According to at least one embodiment of the present disclosure, the interior of the laminate is embedded with a pipeline, and the laminate is rectangular;
The pipeline extends into the concrete cast-in-place area to be connected, or the four corners of the laminate are provided with enlarged grooves, the pipeline extends into the enlarged grooves to be connected, or the pipeline extends out of the side surfaces of the base plate to be connected.
According to another aspect of the present disclosure, a method of constructing a composite precast floor slab as described above, includes:
setting the composite precast floor slab in place;
Providing a groove at the edge of the substrate for connection, placing a connection bar in the groove, and
And casting concrete at least in the concrete cast-in-place area and the groove.
According to at least one embodiment of the present disclosure, at least two connecting bars are placed in the groove, so that the at least two connecting bars are arranged at intervals in the same horizontal plane, or at least two support hogging moment bars are placed in the groove, so that the at least two support hogging moment bars are arranged at intervals in the same horizontal plane.
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 one embodiment of an exemplary composite precast floor slab according to the present disclosure.
Fig. 2 is a schematic diagram of the connection of the embodiment shown in fig. 1.
Fig. 3 is a schematic perspective view of another embodiment of an exemplary composite precast floor slab according to the present disclosure.
Fig. 4 is a schematic diagram of the connection of the embodiment shown in fig. 3.
Fig. 5 is a schematic perspective view of yet another embodiment of an exemplary composite precast floor slab according to the present disclosure.
Fig. 6 is a schematic diagram of the connection of the embodiment shown in fig. 5.
Fig. 7 is a schematic perspective view of yet another embodiment of an exemplary composite precast floor slab according to the present disclosure.
Fig. 8 is a schematic diagram of the connection of the embodiment shown in fig. 7.
Fig. 9 is a schematic illustration of a panel-to-panel connection of a base panel in the form of a feathered edge in an exemplary composite precast floor slab according to the present disclosure.
Fig. 10 is a schematic illustration of a board-to-board connection of base boards in the form of slots in an exemplary composite precast floor slab according to the present disclosure.
Fig. 11 is a schematic view of one embodiment of a groove in an exemplary composite precast floor slab according to the present disclosure.
Fig. 12 is a top view of a connection structure with roof rebar disposed in an exemplary composite precast floor slab of the present disclosure.
Fig. 13 is a cross-sectional view of the connection structure shown in fig. 12.
Fig. 14 is a schematic view of a composite precast floor slab of the present disclosure employing angle steel support in construction.
Fig. 15a to 15d are schematic structural views of different cross-sectional shapes of grooves in a composite precast floor slab according to the present disclosure.
Fig. 16a to 16c are schematic views of different variations of the groove width in the composite precast floor slab according to the present disclosure.
Fig. 17a and 17b are schematic views of various alternative embodiments of the bottom surface of the recess in the composite precast floor slab of the present disclosure.
Fig. 18a and 18b are schematic views showing the arrangement of the connecting reinforcing bars or the supporting negative moment reinforcing bars in the groove in the construction method of the composite precast floor slab of the present disclosure.
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 supporting device of the prefabricated wall and other components needs to be fixed on the floor slab, and the working procedure can be carried out after the laminated layer concrete is solidified, so that the construction efficiency is low.
In addition, the hu-shaped ribs of the reinforced concrete composite floor slab adopted at present greatly reduce the industrial production efficiency of the concrete precast slab part, and the required intervals of the hu-shaped ribs of different projects and different slabs are different, so that the side mold recycling rate for manufacturing the concrete precast slab is low.
To solve at least one of the above-presented technical problems, according to one embodiment of the present disclosure, there is provided a composite precast floor slab 1, the composite precast floor slab 1 including a base plate 11, a laminate 12, and a slab bottom reinforcement 3. The base plate 11 and the laminate 12 are formed by casting concrete into a mold, the shape of which is not limited herein, and may be designed to have various shapes according to necessity, such as a generally rectangular shape, a square shape, an L-shape or a shape with an arc, and the like. When the base plate 11 and the laminate 12 are prefabricated and molded, the corresponding mold is arranged on the mold table, concrete is poured into the mold to form the base plate 11 and the laminate 12, and the laminate 12 is directly formed on the top surface of the base plate 11. The shape of the laminate 12 is not limited herein, and can be designed into various shapes according to the need, such as a general rectangle, square, L-shape or arc shape, etc., but the contact area of the laminate 12 and the substrate 11 is smaller than the contact area of the substrate 11, that is, only part of the top surface of the substrate 11 is covered by the laminate 12, and part of the top surface of the substrate 11 is not covered by the laminate 12, so that the area (the area not covered) of the top surface of the substrate 11, which is not contacted with the laminate 12, forms a concrete cast-in-place area, and concrete is cast into the concrete cast-in-place area for filling during construction, thereby forming an integral stressed floor. The substrate 11 and the laminate 12 are formed by prefabrication directly according to the target thickness of the floor slab, so that the total thickness of the substrate 11 and the laminate 12 reaches the target thickness of the floor slab. Wherein the thickness of the substrate 11 is too small and is easily damaged during transportation and construction, so the thickness of the substrate 11 is not less than 20mm. The total thickness of the base plate 11 and the laminate 12, i.e. the target thickness of the floor slab, is not less than 80mm to increase the rigidity of the prefabricated floor slab. The top surface of plywood 12 is floor structure completion face, and floor structure completion face is the structure floor face that accords with reinforced concrete floor operation requirement, and the required structure floor thickness of design can be satisfied to the top surface at the plywood 12 no longer need be pour concrete at the job site, reduces the wet operation on site to coincide prefabricated floor 1 need not wait for the solidification time of concrete after setting in place, and strutting arrangement of components such as prefabricated wall can directly support and fix on the floor, has improved the efficiency of construction. Through the mode of combining the base plate 11 and the laminate 12, the laminated prefabricated floor slab 1 has better integrity, and can replace the action of truss steel bars in the traditional laminated slab, thereby reducing the steel bar consumption of the truss and saving the component cost.
The plate bottom steel bars 3 are arranged in the base plate 11, the plate bottom steel bars 3 are tension bars paved below the plate, the plate bottom steel bars 3 are arranged at the lower part of the base plate 11 (at a position close to the bottom of the base plate 11), the lower surface of the steel bars meets the protection layer requirement from the bottom surface of the base plate 11, the plate bottom steel bars 3 are covered in the base plate 11, the base plate 11 does not extend out of the side surface of the base plate 11, namely, no beard bars exist, and truss steel bars exist in the base plate 11. When the base plate 11 is manufactured, corresponding plate bottom steel bars 3 are arranged in a mould, concrete is poured into the mould to form an integral stress structure, the problem that side mould recycling rate of manufacturing a concrete precast slab is low due to different spacing required by the Huzi ribs of different projects and different plates is avoided, and the efficiency of industrialized production of precast slab parts of the laminated floor slab is improved. Truss steel bars in the existing precast floor slab mainly have the function of increasing the rigidity of precast slabs in the precast slab transportation and hoisting processes. When the concrete laminated layer is poured, truss steel bars hardly contribute to the overall rigidity of the laminated floor slab, and the truss steel bars have a main effect on the laminated floor slab in order to increase the shearing bearing capacity of the laminated surface. The base plate 11 and the laminate 12 of the laminated precast floor slab 1 disclosed by the disclosure are formed by casting once, so that truss reinforcing steel bars are not required to be arranged in the laminated precast floor slab disclosed by the disclosure, and the using amount of the reinforcing steel bars is reduced.
Depending on the manner of connection, the folded precast floor slab 1 of the present disclosure may take a variety of different embodiments.
In an alternative embodiment of the present disclosure, in order to perform the function of connecting the plate foundation bar with an adjacent plate or plate carrier, a groove 13 for placing the connecting rebar 5 is provided at least part of the edge of the base plate 11 (the edge for making the connection). One end of the groove 13 is opened at the edge of the substrate 11, so that the edge forms a gap, so that the connecting steel bars 5 can extend out of the gap, the groove 13 extends from the edge to the inner side of the edge, can extend along a straight line direction, and the extending direction can be a main stress direction. The cross section of the groove 13 is not limited to a rectangle, but may take other shapes such as a trapezoid, a V-shape, a semicircle, a door opening shape, or the like, wherein the door opening shape is a combination of a semicircle and a rectangle, i.e., the lower part of the groove is a semicircle, and the upper part of the semicircle is a rectangle immediately adjacent to the semicircle. Meanwhile, the shape, width, depth and other parameters of the section can be changed along the extending length direction of the groove 13. When in construction, hu Zijin is not needed, the concrete precast slab can be conveniently hoisted, combined and the like, and after the precast slab is arranged in place, the connecting steel bars 5 can be combined with cast-in-situ concrete to form connection by placing the connecting steel bars 5 in the corresponding grooves 13 and then casting concrete in situ in the grooves 13. If the thickness of the base plate 11 at the bottom of the groove 13 is too large, the reinforcement bar cannot be effectively overlapped, so that the thickness of the base plate 11 at the bottom of the groove 13 is not more than 60mm.
Referring to the cross-sectional form of the recess shown in fig. 15a, the cross-section of the recess 131 may be rectangular, and rounded corners may be provided at the bottom corners of the rectangular recess 131. 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 shown in fig. 15b, the cross-section of the groove 131 may take the form of a trapezoid, and the width of the upper portion of the groove 131 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 grooves shown in fig. 15c, the cross-section of the grooves 131 may be V-shaped, and the bottoms of the V-shaped grooves 131 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 131 also has the function of reinforcing steel bar limiting.
Referring to the cross-section of the groove shown in fig. 15d, the cross-section of the groove 131 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 131, 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 diagrams of the different variant embodiments of the groove width shown in fig. 16a, 16b and 16c, in the direction in which the groove 131 extends from the edge of the substrate 11 or the laminate 12 where it is located to the inside of the edge, that is, in the length direction of the groove 131, the width of the groove 131 may be set to be the same (fig. 16 a), or the width of the groove 131 at the edge of the substrate 11 or the laminate 12 may be set to be smaller than the width of the groove 131 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. 16 b) or may be widened over a portion of the length inside the edge (fig. 16 c). The inverted wedge-shaped groove 131 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 connecting steel bars put in the groove after casting can be possibly canceled by adopting the groove with the shape, 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. 17a and 17 b. The depth of the groove 131 may be set to be the same in a direction in which the groove 131 extends from the edge of the substrate 11 or the laminate 12 where it is located to the inside of the edge, that is, in the length direction of the groove 131, or the depth of the groove 131 at the edge of the substrate 11 or the laminate 12 may be set to be greater than the depth of the groove 131 inside the edge, that is, the depth of the groove 131 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 13 may be provided with a rugged surface, such as an embodiment of the groove shown in fig. 11, in which the inner wall of the groove 13 is provided with a corrugation groove 131, so that the inner wall of the groove 13 forms a corrugated undulating surface to increase the contact area with the post-cast concrete after casting the concrete in the groove 13, and increase the coupling force and the firmness. The inner wall of the groove 13 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 13 is formed to be uneven.
In an alternative embodiment of the present disclosure, in order to perform the function of connecting the plate foundation bar to an adjacent plate or plate support, the thickness of the base plate 11 is thinned at least part of the edge of the base plate 11 (the edge for connection). This solution can be seen as one of the forms of the recess 13 being provided, i.e. the edge thinned areas of the substrate 11 are all seen as the recess 13 being provided. The connection bars 5 are placed on the thinned surface of the base plate 11, and concrete is poured to embed the connection bars 5 therein.
In an alternative embodiment of the present disclosure, see a top view of the connection structure provided with the plate top reinforcing bars shown in fig. 12, and a cross-sectional view of the connection structure provided with the plate top reinforcing bars shown in fig. 13. The upper part of the laminate 12 (the position near the top of the laminate 12) may be provided with roof bars 4, the upper surface of which meets the protective layer requirements from the top of the laminate 12, and the roof bars 4 are covered inside the laminate 12 without extending the laminate 12 from the side of the laminate 12, i.e. without having a hoof bar. The plate top steel bar 4 is a steel bar arranged at the upper part of the plate and mainly bears negative bending moment and prevents the cracking of the plate surface. In the manufacture of the laminate 12, the roof reinforcement 4 is laid in the mould and then concrete is poured into the mould.
In an alternative embodiment of the present disclosure, at least part of the edges of the laminate 12 (the edges for making the connection) are also provided with grooves 13 for placing the connecting bars 5, the grooves 13 extending from the edge where they are located to the inside of the edge where they are located. In the case where the roof reinforcement 4 is provided, the groove 13 needs to avoid the roof reinforcement 4, and interference between the roof reinforcement 4 and the groove is avoided, so that the roof reinforcement 4 is not exposed in the groove 13. The grooves 13 are similar in form and arrangement to the grooves 13 at the edge of the substrate 11 and will not be described in detail herein.
In an alternative embodiment of the present disclosure, the placed connecting bars 5 may also be avoided by reducing the area of the laminate 12. The connection bars 5 are placed on the base plate 11, the thickness of the base plate 11 is not thinned, and the connection bars 5 are buried in the poured concrete.
That is, the different connection modes are formed by combining the four modes, i.e., forming the groove 13 at the connection edge of the substrate 11 or thinning the edge of the substrate 11 and forming the groove 13 at the connection edge of the laminate 12 or reducing the area of the laminate 12, with reference to the different embodiments and connection modes shown in fig. 1 to 8. Wherein, fig. 1 and 2 are embodiments of forming grooves 13 on the substrate 11 and the laminate 12, fig. 3 and 4 are embodiments of forming grooves 13 on the substrate 11 and reducing the area of the laminate 12, fig. 5 and 6 are embodiments of thinning the edge of the substrate 11 and forming grooves 13 on the laminate 12, and fig. 7 and 8 are embodiments of thinning the edge of the substrate 11 and reducing the area of the laminate 12. In the implementation process, corresponding selection can be performed according to the actual conditions.
For example, referring to the schematic view of the panel-to-panel connection of the base panels 11 shown in fig. 9, the connection bars 5 are placed on the thinned edges of the two base panels 11 and concrete is poured to be flush with the surface of the laminate 12. Or referring to the schematic illustration of the plate-to-plate connection of the base plates 11 in the form of slots shown in fig. 10, the connection bars 5 are placed in a corresponding set of grooves 13 of two base plates 11, and concrete is poured to be flush with the surface of the laminate 12.
Alternatively, the grooves 13 may be provided in plural, and the plural grooves 13 may be arranged at a spacing from the plate bottom reinforcing bars 3 or the plate top reinforcing bars 4. If the cross-sectional shape of the grooves 13 is selected to be rectangular, the width of the grooves 13 ranges from 50mm to 300mm, and the width of the concrete tooth between adjacent grooves 13 ranges from 50mm to 300mm.
In an alternative embodiment of the present disclosure, the plate bottom steel bar 3 or the plate top steel bar 4 may be formed by using a plurality of steel bars arranged in parallel and at intervals in the same horizontal plane, and the directions of the plate bottom steel bar 3 and the plate top steel bar 4 may be the same or perpendicular to each other. Alternatively, both the plate bottom steel bars 3 and the plate top steel bars 4 may be steel bar meshes or one of them may be steel bar meshes, and the other may be in 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. And the industrial production is easy to realize, the net sheet can be automatically welded into a net by a machine, and the net sheet is put into a prefabricated floor slab template by a manipulator.
In an alternative embodiment of the present disclosure, the substrate 11 is rectangular, the grooves 131 are uniformly spaced in the middle area of the edge of the substrate 11, that is, the four edges of the substrate 11 are all provided with a plurality of grooves 131, and the plurality of grooves 131 are distributed along the middle area of each edge, the extending direction of the grooves 131 is perpendicular to the edge where the grooves 131 of one set of opposite edges are perpendicular to the extending direction of the grooves 131 of the other set of opposite edges, and the four corners of the substrate 11 may be provided with enlarged grooves 132 with larger coverage areas, such as square grooves 132 covering the whole corner area, which is equivalent to thinning the thickness of the four corners of the substrate 11. This arrangement is suitable for boards that are connected in two directions, i.e. in both vertical directions. However, the present disclosure is not limited thereto, and the grooves 131 may be provided only at one set of 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, the edges of the lamina 12 are not limited to straight and may include curved sections. For example, the concrete can be made into a folded line shape or an irregular curve, which is beneficial to increasing the contact area of post-cast concrete and precast concrete and enhancing the bonding effect between the post-cast concrete and the precast concrete.
Alternatively, the support hogging moment steel bars can be avoided by reducing the size of the plane dimension of the laminate 12 (such as being smaller than the length of the support hogging moment steel bars), so that the component production is simplified, and the site construction speed is increased. The support hogging moment steel bars are connecting steel bars for overlapping the plate top steel bars 4 in the two superposed precast floor slabs 1.
In an alternative embodiment of the present disclosure, if the shape of the base plate 11 and the laminate 12 is rectangular, the geometric centers of the base plate 11 and the laminate 12 coincide, and the distance between the edge of the laminate 12 and the edge of the base plate 11 corresponding to its position is not less than 1/4 of the shorter side length of the base plate 11, so as to satisfy the requirement of placing the support reinforcing bars.
In an alternative embodiment of the present disclosure, a pipeline (not shown in the drawings) is embedded inside the base plate 11, and the base plate 11 is arranged in a rectangular shape. The concrete composite precast floor 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.
In the first mode, the four corners of the base plate 11 are provided with enlarged grooves 132, the grooves 132 may cover the entire corner area, thereby reducing the thickness of the four corners of the base plate 11, and the pipes buried in the base plate 11 extend into the grooves 132 of the four corners of the base plate 11, and since post-cast concrete is provided in the grooves 132, connection can be made in the grooves 132, and then concrete is cast.
In the second mode, the pipelines embedded in the base plate 11 extend out from the side surface of the base plate 11, and since the beams matched with the precast slabs are provided with the position of the overlapped layers and post-cast concrete is arranged at the position of the overlapped layers, the pipelines extending out from the side surface of the base plate 11 can be connected at the position of the overlapped layers and then the concrete is cast.
Alternatively, the interior of the laminate 12 may be embedded with a pipeline (not shown), and the laminate 12 is rectangular, and the connection scheme of the pipeline is similar to that of the pipeline embedded in the base plate 11. Or the lines to make the connection. . . . . Since the structure of the laminate 12 and the base plate 11 is formed with a concrete cast-in-place area, the following three different implementation structures can be formed.
In the first mode, the pipeline embedded in the laminate 12 extends out from the side of the laminate 12 into the concrete cast-in-place area, and the pipeline can be connected in the concrete cast-in-place area and then concrete is poured because of post-cast concrete in the concrete cast-in-place area.
In the second mode, the four corners of the laminate 12 are provided with enlarged grooves 132, the grooves 132 may cover the entire corner area, thereby reducing the thickness of the four corners of the laminate 12, and the pipes buried in the laminate 12 extend into the grooves 132 of the four corners of the laminate 12, and since post-cast concrete is provided in the grooves 132, the pipes may be connected in the grooves 132 and then concrete may be cast.
In the third mode, the pipeline embedded in the laminate 12 extends out of the side surface of the base plate 11 from the side surface of the laminate 12, and the post-cast concrete is arranged at the position of the overlapped layer because the beam matched with the precast slab is provided with the overlapped layer, so that the pipeline extending out of the side surface of the base plate 11 can be connected at the position of the overlapped layer, and then the concrete is cast.
The present disclosure also provides a construction method of the composite precast floor slab 1, and the structure of the composite precast floor slab 1 includes a base plate 11, a laminate 12 stacked on the top surface of the base plate 11, and a plate bottom reinforcing steel bar 3 disposed on the base plate 11. The base plate 11 and the laminate 12 are both formed by prefabrication of concrete, the contact area of the laminate 12 and the base plate 11 is smaller than that of the base plate 11, the top surface of the laminate 12 is a floor structure finished surface, and the plate bottom steel bars 3 are covered inside the base plate 11. Wherein the areas of the base plate 11 not in contact with the laminate 12 form a concrete cast-in-place area. The construction method comprises the following steps:
The composite precast floor slab 1 is arranged in place, and the composite precast floor slab 1 and the target component can be butted and fixed through hoisting and supporting devices.
The construction method for setting the composite precast floor slab 1 in place can adopt a mode of setting vertical supports at the bottom of the slab, and optionally, the slab can also be directly supported by setting angle steel and the like on the slab support 6, such as a wall or a beam, so that the installation of the vertical supports can be avoided, and the construction efficiency is improved. Referring to the schematic view of angle steel support adopted in construction of the composite precast floor slab of the present disclosure shown in fig. 14, the composite precast floor slab 1 is supported in the form of angle steel 31, wherein the upper end surface of the angle steel 31 supports the composite precast floor slab 1, and the other end surface of the angle steel 31 is fixedly connected to the slab support 6 through bolts, by the above-mentioned support method of the angle steel 31, the step of installing a large number of vertical supports can be omitted, thereby reducing labor, improving efficiency and saving manufacturing cost.
The base plate 11 is provided with a groove 13 at the edge for connection, the connecting steel bars 5 are placed in the groove 13, at least one part of the connecting steel bars 5 extends out of the groove 13, if the plate top steel bars 4 are embedded in the laminate 12, the corresponding groove 13 can be formed at the connecting edge of the laminate 12, and the support negative bending moment steel bars 7 are required to be placed in the groove 13.
Wherein, the connecting steel bars 5 or the supporting negative bending moment steel bars 7 can be placed in each groove 13. Alternatively, referring to fig. 18a and 18b, a schematic diagram of a setting mode of connecting steel bars in a groove or supporting negative bending moment steel bars in a construction method of a composite precast floor slab according to the present disclosure may be shown, and in the construction process, at least two connecting steel bars may be placed in the groove 13, so that the at least two connecting steel bars are arranged at intervals in the same horizontal plane. Fig. 18a shows a case where the groove width of the groove 13 is small, the groove width is 150mm-200mm, and one connecting bar is provided at each side in the groove 13. Fig. 18b shows a case where the groove width of the groove 13 is large, the groove width is 200mm-250mm, and one connecting bar is provided at each side in the groove 13. Similarly, at least two support hogging moment steel bars 7 can be placed in the groove 13, so that the at least two support hogging moment steel bars 7 are arranged at intervals in the same horizontal plane. In the case where the support hogging moment bars 7 are provided, fig. 18a and 18b are plan views seen from above, and since the connection bars are located right below the support hogging moment bars 7, they are not shown, the width of the groove 13 and the arrangement positions of the two support hogging moment bars 7 are the same as those of the two connection bars.
And casting concrete at least in the concrete cast-in-place area and the groove 13, so that the cast-in-place concrete and the composite precast floor slab 1 form an integral stress plate, and the composite precast floor slab 1 is connected with a target part through the connecting steel bars 5 and the cast concrete.
The height of the poured concrete may be equal to the height of the top surface of the deck 12 such that the top surface of the deck 12 and the top surface of the poured concrete form an integral floor structure finish.
Alternatively, the height of the concrete poured in situ may be lower than the height of the top surface of the laminate 12, corresponding treatment may be performed according to engineering requirements, and then the top surface of the concrete poured and the top surface of the laminate 12 may be formed into an integral floor structure finished surface by 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)
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