CN110847467A

CN110847467A - Laminated prefabricated floor slab and construction method thereof

Info

Publication number: CN110847467A
Application number: CN201911129543.2A
Authority: CN
Inventors: 马云飞; 王景龙; 张猛; 杨逸
Original assignee: Sany Construction Industry Co Ltd
Current assignee: Sany Construction Technology Co Ltd; Sany Construction Industry Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-28

Abstract

The utility model provides a coincide precast floor slab, including the base plate, superpose at the plywood of base plate top surface and set up the board bottom reinforcing bar at the base plate. The base plate and the laminated plate are both formed by prefabricating concrete; the contact area of the laminated plate and the substrate is smaller than that of the substrate, and the top surface of the laminated plate is a floor structure finished surface; the bottom plate reinforcing steel bars are covered inside the base plate. Wherein the area of the base plate not in contact with the laminate forms a concrete cast-in-place area. The floor structure finished surface of the composite prefabricated floor slab is a structural floor slab surface meeting the use requirement of the reinforced concrete floor slab, the thickness of the structural floor slab required by design can be met without pouring concrete on the top surface of the floor slab at the construction site, the wet operation on the site is reduced, and the construction efficiency is improved.

Description

Laminated prefabricated floor slab and construction method thereof

Technical Field

The disclosure relates to the field of assembly type buildings, in particular to a composite prefabricated floor slab and a construction method thereof.

Background

The fabricated building refers to a building fabricated at a construction site using prefabricated parts. The building has the advantages of high construction speed, small restriction by climatic conditions, labor saving and building quality improvement. At present, in an assembled monolithic concrete structure, a reinforced concrete composite floor slab is generally adopted, and the method is to arrange truss steel bars on the upper surface (not the finished surface of the floor slab structure) of a concrete precast slab, and pour a concrete composite layer on site to cover the truss steel bars, so that the concrete precast slab becomes a monolithic concrete structure and bears load together. The provision of the truss reinforcement leads to an increase in steel content and an increase in cost.

Cast-in-place superimposed layer on the precast concrete floor needs to be in cast-in-place a large amount of concrete, and wet operation is more to the solidification of superimposed layer concrete needs certain time, and the strutting arrangement of components such as prefabricated wall need fix on the floor, and this process must wait that superimposed layer concrete can go on after solidifying, leads to the efficiency of construction low.

Generally, the side face of the concrete precast slab needs to extend out of a steel bar (a beard rib) to realize connection with an adjacent plate or a plate support, the existence of the beard rib greatly reduces the industrial production efficiency of the concrete precast slab, and the distances required by the beard ribs of different projects and different plates are different, so that the recycling rate of the side form for manufacturing 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 an aspect of the present disclosure, a laminated precast floor slab includes:

a base plate prefabricated from concrete;

the top surface of the laminated plate is a floor structure finished surface; and

the bottom plate reinforcing steel bar is arranged on the base plate and is covered in the base plate;

wherein the area of the base plate not in contact with the laminate forms a concrete cast-in-place area.

According to at least one embodiment of the present disclosure, at least a part of the edge of the base plate is provided with a groove for placing a connecting reinforcement, and the groove extends from the edge to the inner side of the edge.

According to at least one embodiment of the present disclosure, the deck is provided with a sheet top reinforcement, and the sheet top reinforcement is covered inside the deck.

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, the grooves extending from the edges to the inner side of the edges.

According to at least one embodiment of the present disclosure, the slab-bottom rebars and/or the slab-top rebars are mesh rebars.

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 60 mm; the total thickness of the substrate and the laminate is not less than 80 mm.

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, an 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, in a direction in which the groove extends from the edge to the inner side of the edge, the width of the groove is the same or the width of the groove is increased to form a shape with a narrow outer part and a wide inner part.

According to at least one embodiment of the present disclosure, in a direction in which the grooves extend from the edge to the inner side of the edge, the grooves have the same depth or the grooves have a smaller depth.

According to at least one embodiment of the present disclosure, the bottom surface of the groove includes a slope 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, and the pipelines extend into the enlarged grooves for connection; or the line extends from the side of the substrate for connection.

According to at least one embodiment of the disclosure, pipelines are embedded in the laminate, and the laminate is rectangular;

the pipeline extends out of the concrete cast-in-place area for connection; or four corners of the laminate are provided with enlarged grooves, and the pipelines extend into the enlarged grooves for connection; or the pipeline protrudes outside the side of the substrate for connection.

According to another aspect of the present disclosure, a construction method of a laminated precast floor slab as described above includes:

setting the laminated precast floor slab in place;

arranging a groove at the edge of the substrate for connection, and placing a connecting steel bar in the groove; and

and pouring 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 steel bars are placed in the groove, so that the at least two connecting steel bars are arranged at intervals in the same horizontal plane; or at least two support negative-moment reinforcing steel bars are placed in the groove, so that the at least two support negative-moment reinforcing steel 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 perspective view of one embodiment of an exemplary laminated precast floor slab according to the present disclosure.

Fig. 2 is a schematic diagram of the connection mode of the embodiment shown in fig. 1.

Fig. 3 is a perspective view of another embodiment of an exemplary laminated precast floor slab according to the present disclosure.

Fig. 4 is a schematic diagram of the connection mode of the embodiment shown in fig. 3.

Fig. 5 is a perspective view of yet another embodiment of an exemplary laminated precast floor slab according to the present disclosure.

Fig. 6 is a schematic diagram of the connection mode of the embodiment shown in fig. 5.

Fig. 7 is a perspective view of yet another embodiment of an exemplary laminated 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 view of a slab-to-slab connection with a base slab in the form of a thin edge in an exemplary laminated precast floor slab according to the present disclosure.

Fig. 10 is a schematic view of a slab-to-slab connection with a slotted base in an exemplary laminated precast floor slab according to the present disclosure.

FIG. 11 is a schematic view of one embodiment of a groove in an exemplary laminated precast floor slab according to the present disclosure.

Fig. 12 is a top view of a connection structure provided with a slab-top reinforcement in an exemplary laminated precast floor slab of the present disclosure.

Fig. 13 is a sectional view of the coupling structure shown in fig. 12.

Fig. 14 is a schematic view of the laminated precast floor slab of the present disclosure using angle iron support in construction.

Fig. 15a to 15d are schematic views showing different sectional shapes of the groove in the laminated precast floor slab according to the present disclosure.

Fig. 16a to 16c are schematic views of different variations of groove widths in laminated precast floor slabs according to the present disclosure.

Fig. 17a and 17b are schematic views of different variations of the bottom surfaces of the grooves in the laminated precast floor slabs according to the present disclosure.

Fig. 18a and 18b are schematic views illustrating an arrangement manner of connecting reinforcing steel bars or support hogging moment reinforcing steel bars in grooves in the construction method of the laminated precast floor slab of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure 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 need to be configured at the superposed surface of the cast-in-situ part and the prefabricated part, and the existence of the truss steel bars obviously improves the steel content (steel bar content in unit area) of the floor slab, increases the construction cost of a building structure and becomes an important obstacle to the development of an assembly type building. A large amount of concrete needs to be poured on site during construction, wet operation is more, the solidification of the superposed layer concrete needs a certain time, the supporting devices of the components such as the prefabricated wall and the like need to be fixed on the floor slab, the process can be carried out after the superposed layer concrete is solidified, and the construction efficiency is low.

In addition, the beard ribs of the currently adopted reinforced concrete composite floor slab greatly reduce the efficiency of the industrial production of the concrete precast slab part, and the intervals required by the beard ribs of different projects and plates are different, so that the recycling rate of the side mold for manufacturing the concrete precast slab is low.

To solve at least one of the above-existing technical problems, according to an embodiment of the present disclosure, there is provided a laminated precast floor slab 1, the laminated precast floor slab 1 including a base plate 11, a deck plate 12, and a slab-bottom reinforcing bar 3. The base plate 11 and the layer plate 12 are prefabricated by pouring concrete into a mold, and the shape thereof is not limited herein, and may be designed into various shapes according to the need, such as a generally rectangular shape, a square shape, an L shape or a shape with an arc line. When the base plate 11 and the layer plate 12 are prefabricated, the base plate 11 and the layer plate 12 are formed by pouring concrete into a mould through arranging the corresponding mould on a mould table, so that the layer plate 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 requirement, such as a common rectangle, a square, an L shape or a shape with an arc line; however, the contact area of the layer plate 12 and the base plate 11 is smaller than that of the base plate 11, that is, only part of the top surface of the base plate 11 is covered by the layer plate 12, and part of the top surface of the base plate 11 is not covered by the layer plate 12, the area (uncovered area) of the top surface of the base plate 11 which is not in contact with the layer plate 12 forms a concrete cast-in-place area, and concrete is poured into the concrete cast-in-place area for filling during construction, so that the integral stressed floor is formed. The base plate 11 and the deck plate 12 are prefabricated directly according to a target thickness of the floor slab when the base plate 11 and the deck plate 12 are formed, so that the total thickness of the base plate 11 and the deck plate 12 reaches the target thickness of the floor slab. Wherein, the thickness of the substrate 11 is too small and is easy to be damaged in the transportation and construction process, so the thickness of the substrate 11 is not less than 20 mm. The total thickness of the base plate 11 and the deck plate 12, that is, 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 the laminated plate 12 is a floor structure finished surface which is a structural floor surface meeting the use requirement of the reinforced concrete floor, the thickness of the structural floor required by design can be met without pouring concrete on the top surface of the laminated plate 12 at the construction site, the wet operation on the site is reduced, the setting time of the concrete is not required to wait after the laminated prefabricated floor 1 is set in place, and the supporting device of the components such as the prefabricated wall and the like can be directly supported and fixed on the floor, so that the construction efficiency is improved. Through the mode of base plate 11 and plywood 12 combination, make coincide prefabricated floor 1 have better wholeness, the effect of the truss reinforcing bar in the fungible traditional superimposed sheet, reduced the reinforcing bar quantity of truss from this, practice thrift the component cost.

The bottom plate steel bar 3 is arranged in the base plate 11, the bottom plate steel bar 3 is a tension bar laid below the plate, the bottom plate steel bar 3 is arranged at the lower part of the base plate 11 (close to the bottom of the base plate 11), the distance between the lower surface of the steel bar and the bottom surface of the base plate 11 meets the requirement of a protective layer, the bottom plate steel bar 3 is 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 bar exists, and no truss steel bar exists in the base plate 11. When the base plate 11 of the present disclosure is manufactured, the corresponding plate bottom steel bars 3 are arranged in the mould, then concrete is poured into the mould to form an integral stress structure, so that the problem that the repeated utilization rate of the side mould for manufacturing the concrete precast slab is low due to different projects and different distances required by the beard steel bars of different plates is avoided, and the efficiency of the partial industrial production of the precast slab of the laminated floor slab is improved. The function of the truss steel bar in the existing precast floor slab is mainly to increase the rigidity of the precast slab in the process of transporting and hoisting the precast slab. After the concrete laminated layer is poured, the truss reinforcing steel bars hardly contribute to the integral rigidity of the floor slab, and the main effect of the truss reinforcing steel bars on the laminated floor slab is to increase the shearing-resistant bearing capacity of the laminated surface. The base plate 11 and the plywood 12 of the laminated precast floor slab 1 are formed by one-time pouring, so that the truss reinforcing steel bars do not need to be arranged in the laminated precast floor slab 1, and the using amount of the reinforcing steel bars is reduced.

The laminated precast floor slab 1 of the present disclosure may adopt various embodiments according to the connection manner.

In an alternative embodiment of the present disclosure, in order to achieve the function of connecting the bottom ribs of the plate with the adjacent plate or plate support, at least a part of the edge (edge for connection) of the base plate 11 is provided with a groove 13 for placing the connecting steel bar 5. One end of the groove 13 is arranged on the edge of the base plate 11, so that the edge forms a gap, so that the connecting steel bar 5 can extend out of the edge from the gap, the groove 13 extends from the edge to the inner side of the edge and can extend along a straight line, and the extending direction can be the main stress direction. The section of the groove 13 is not limited to be rectangular, and other shapes such as trapezoid, V-shaped, semicircular or door-hole shape can be adopted; the door opening shape refers to a combination of a semicircular shape and a rectangular shape, namely, the lower part of the groove is semicircular, and the upper part of the semicircular shape is adjacent to the rectangular shape. Meanwhile, the shape, width, depth and other parameters of the cross section of the groove 13 along the extending length direction can be changed. During construction, the beard ribs are not provided, the concrete precast slab can be conveniently hoisted, combined and the like, after the concrete precast slab is arranged in place, the connecting reinforcing steel bars 5 are placed in the corresponding grooves 13, and then concrete is poured in the grooves 13 in situ, so that the connecting reinforcing steel bars 5 are combined with the cast-in-place concrete to form connection. The thickness of the base plate 11 at the bottom of the groove 13 is too large, the steel bars cannot be effectively lapped, and therefore the thickness of the base plate 11 at the bottom of the groove 13 is not more than 60 mm.

Referring to the sectional form of the groove shown in fig. 15a, the section of the groove 131 may be rectangular, and the bottom corners of the rectangular groove 131 may be rounded. The production mold with the rectangular section is simple, and the fillet at the corner of the bottom is convenient for the removal of the mold.

Referring to the sectional form of the groove shown in fig. 15b, the section of the groove 131 may take a trapezoidal shape, and the width of the upper portion of the groove 131 is greater than that of the bottom portion. The mold of this shape is somewhat complex, but is easy to remove, facilitating casting while achieving a greater width of the tooth bottom and the groove top.

Referring to the cross-sectional form of the groove shown in fig. 15c, the cross-section of the groove 131 may be V-shaped, and the bottom of the V-shaped groove 131 may be slightly smooth, such as rounded or flat. Adopt the V-arrangement section, the mould is complicated slightly, but is convenient for demolish, is convenient for pour, and the bottom of recess 131 has the spacing effect of reinforcing bar concurrently simultaneously.

Referring to the sectional form of the groove shown in fig. 15d, the section of the groove 131 may be a door-opening shape, which means that the lower portion of the groove 131 is a semicircular section, and the upper portion of the semicircular section is a rectangular section, and the sections of the two shapes are combined to form the door-opening section. With a cross section of this shape, the mould is relatively complex, but removal of the mould is facilitated.

Alternatively, referring to the schematic diagrams of different variation of the groove width shown in fig. 16a, 16b and 16c, the width of the groove 131 may be set to be the same in the direction in which the groove 131 extends from the edge of the substrate 11 or laminate 12 on which it is located toward the inner side of the edge, that is, in the length direction of the groove 131 (fig. 16a), or the width of the groove 131 at the edge of the substrate 11 or laminate 12 may be set to be smaller than the width of the groove 131 inside the edge to form an inverted wedge shape having a narrow outer portion and a wide inner portion. It may be gradually wider (fig. 16b) or it may be wider over part of the length inside the edge (fig. 16 c). The inverted wedge-shaped groove 131 with the narrow outer part and the wide inner part is favorable for forming an inverted wedge shape by post-pouring concrete in the groove, so that the anchoring effect is enhanced.

Alternatively, see figures 17a and 17b for a schematic view of different variations of the groove bottom surface. 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 on which it is formed to the inner side 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 larger than the depth of the groove 131 at the inner side of 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 gradually inclined from the inside to the outside or a stepped surface varying in steps, and may also include both the slope and the stepped surface. The effect of the reduced depth of the groove from the outside to the inside is that the length of the lower connecting steel bar is shorter, while the length of the upper connecting steel bar is longer. In addition, the on-site post-cast concrete amount can be reduced by adopting the mode, and the shallower the groove is, the easier the demoulding is, and the more convenient the production is.

Alternatively, the inner wall of the groove 13 may be provided with an uneven surface, for example, as shown in fig. 11, an embodiment of the groove is schematically illustrated, in which the inner wall of the groove 13 is provided with a corrugated groove 131, so that the inner wall of the groove 13 forms a corrugated surface, thereby increasing the contact area with the post-cast concrete after the concrete is cast in the groove 13, and increasing the connection force and the firmness. The inner wall of the groove 13 may be provided with a plurality of recesses or a plurality of protrusions, and the inner wall surface of the groove 13 may be formed into an uneven structure, which is not particularly limited herein.

In an alternative embodiment of the present disclosure, in order to achieve the function of the plate bottom ribs in connection with the adjacent plate or plate support, the thickness of the base plate 11 is reduced at least at a part of the edge (edge for connection) of the base plate 11. This solution can be regarded as one of the forms of forming the groove 13, that is, the edge thinning regions of the substrate 11 are regarded as the formed grooves 13. 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, reference is made to a top view of the coupling structure provided with the plate-top reinforcing bars shown in fig. 12 and a cross-sectional view of the coupling structure provided with the plate-top reinforcing bars shown in fig. 13. The upper portion of the deck 12 (the position near the top of the deck 12) may be provided with a steel top bar 4, the upper surface of the bar being spaced from the top surface of the deck 12 to meet the protective layer requirements, and the steel top bar 4 being covered inside the deck 12 without extending the deck 12 from the side of the deck 12, i.e. without any mustache bars. The plate top reinforcing bars 4 are reinforcing bars provided on the plate, and mainly bear negative bending moment and prevent plate cracking. When the laminate 12 is manufactured, the plate top reinforcing steel bars 4 are laid in the mold, and then concrete is poured into the mold.

In an alternative embodiment of the present disclosure, at least part of the edges of the layer 12 (the edges for connection) are also provided with grooves 13 for placing the connecting bars 5, the grooves 13 extending from the edges to the inside of the edges. In the case where the plate-top reinforcing bars 4 are provided, the grooves 13 need to avoid the plate-top reinforcing bars 4, and interference between the two is avoided, so that the plate-top reinforcing bars 4 are not exposed in the grooves 13. The form and arrangement of the recess 13 is similar to the recess 13 at the edge of the substrate 11 and will not be described further.

In an alternative embodiment of the present disclosure, the placed connecting rebars 5 can also be avoided by reducing the area of the layer plates 12. The connecting reinforcing bars 5 are placed on the base plate 11, the thickness of the base plate 11 is not reduced, and the connecting reinforcing bars 5 are embedded in the poured concrete.

That is, the different connection modes are formed by different combinations of forming the groove 13 on the connection edge of the substrate 11 or thinning the edge of the substrate 11 and forming the groove 13 on the connection edge of the laminate 12 or reducing the area of the laminate 12, see the different embodiments and connection modes shown in fig. 1 to 8. Wherein, fig. 1 and fig. 2 are embodiments of the substrate 11 and the laminate 12 both provided with the groove 13; FIGS. 3 and 4 show embodiments in which the substrate 11 is provided with recesses 13 and the layer 12 is of reduced area; FIGS. 5 and 6 show an embodiment in which the substrate 11 is edge thinned and the laminate 12 is provided with a recess 13; FIGS. 7 and 8 illustrate embodiments of reduced area of the ply 12 with reduced edge thinning of the substrate 11. In the specific implementation process, the corresponding selection can be performed according to the actual condition.

For example, referring to the schematic diagram of the plate-to-plate connection of the base plate 11 in the form of a thin edge shown in fig. 9, the connecting reinforcement 5 is placed on the thinned edges of the two base plates 11, and concrete is poured to be flush with the surface of the laminate 12. Or referring to fig. 10, the base plate 11 is a schematic diagram of a plate-to-plate connection mode in a slotted form, the connecting steel bars 5 are placed in a corresponding group of grooves 13 of the two base plates 11, and concrete is poured to be flush with the surface of the layer plate 12.

Alternatively, the plurality of grooves 13 may be provided, and the plurality of grooves 13 are spaced apart from the bottom plate-reinforcing bars 3 or the top plate-reinforcing bars 4. If the cross-sectional shape of the grooves 13 is chosen 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 300 mm.

In an alternative embodiment of the present disclosure, the slab-bottom rebars 3 or the slab-top rebars 4 may be formed by a plurality of rebars arranged in parallel and at intervals in the same horizontal plane, and the directions of the slab-bottom rebars 3 and the slab-top rebars 4 may be the same or perpendicular to each other. Alternatively, both the bottom rebars 3 and the top rebars 4 may be mesh rebars or one of them may be mesh rebars, and the other may be in other forms. The reinforcing mesh is a mesh which is made by criss-crossing longitudinal and transverse reinforcing bars through binding or welding and is of a planar structure. The reinforcing mesh can improve the quality of reinforcing engineering, improve the construction speed and enhance the anti-cracking capability of concrete. The industrial production is easy to realize, and the mesh can be automatically welded into a net by a machine and put into the 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 region of the edge of the substrate 11, that is, the four edges of the substrate 11 are provided with a plurality of grooves 131, and the plurality of grooves 131 are distributed along the middle region of each edge, the extending direction of the grooves 131 is perpendicular to the edge where the grooves 131 are located, 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 a larger coverage area, for example, square grooves 132 covering the whole corner region, which is equivalent to thinning the thickness of the four corners of the substrate 11. This arrangement is suitable for boards that are to be connected in two directions, i.e. in both perpendicular directions. The disclosure is not limited thereto, and the grooves 131 may be disposed only at one set of two opposite edges, i.e., opposite edges, which is suitable for a board for unidirectional connection, i.e., connection only in one direction.

In an alternative embodiment of the present disclosure, the edges of the plies 12 are not limited to being straight and may include curved segments. For example, the concrete can be made into a broken line shape or an irregular curve, which is beneficial to increasing the contact area between post-cast concrete and precast concrete and enhancing the bonding effect between the post-cast concrete and the precast concrete.

Optionally, the size of the plane dimension of the laminate 12 (such as the length of the support hogging moment steel bar) can be reduced to avoid the support hogging moment steel bar, so that the production of the component is simplified, and the field construction speed is increased. The support hogging moment reinforcing steel bar is used for connecting two laminated precast floor slabs 1 and the plate top reinforcing steel bar 4.

In an alternative embodiment of the present disclosure, if the substrate 11 and the laminate 12 are both rectangular, the geometric centers of the substrate 11 and the laminate 12 are coincident, and the distance between the edge of the laminate 12 and the edge of the substrate 11 corresponding to the position is not less than 1/4 of the shorter side of the substrate 11, so as to meet the requirement of placing the support steel bar.

In an alternative embodiment of the present disclosure, the base plate 11 is embedded with a pipeline (not shown), and the base plate 11 is configured to be rectangular. The concrete laminated precast floor slabs are spliced into a whole on site, and pipelines in each precast slab need to be connected on the construction site. The pipeline connection is performed in a place where post-cast concrete is present, because concrete is cast after the pipeline connection is performed on site. The following two different embodiments are provided according to different connection positions.

The first mode is as follows: the four corners of the base plate 11 are provided with enlarged grooves 132, the grooves 132 can cover the whole corner regions, so that the thickness of the four corners of the base plate 11 is reduced, the pipeline embedded in the base plate 11 extends into the grooves 132 of the four corners of the base plate 11, and the grooves 132 can be connected by post-pouring concrete, and then the concrete is poured.

The second mode is as follows: the pipeline embedded in the base plate 11 is extended from the side of the base plate 11, and since the girder coupled with the prefabricated panels has a position of the overlapped layer where the post-cast concrete is located, the pipeline extended from the side of the base plate 11 can be connected at the position of the overlapped layer and then the concrete is cast.

Alternatively, pipelines (not shown) may be embedded in the laminate 12, and the laminate 12 is configured to be rectangular, and the pipeline connection scheme is similar to the pipeline connection scheme embedded in the substrate 11. Or the lines to make the connection. . . . . Since the structure of the slab 12 and the base plate 11 forms a concrete cast-in-place area, the following three different implementation structures can be formed.

The first mode is as follows: the pipeline embedded in the slab 12 extends from the side surface of the slab 12 to the concrete cast-in-place area, and the pipeline can be connected in the concrete cast-in-place area due to the post-cast concrete in the concrete cast-in-place area, and then the concrete is poured.

The second mode is as follows: the four corners of the laminate 12 are provided with enlarged grooves 132, the grooves 132 can cover the whole corner regions, so that the thickness of the four corners of the laminate 12 is reduced, the pipeline embedded in the laminate 12 extends into the grooves 132 of the four corners of the laminate 12, the pipeline can be connected in the grooves 132 due to the post-cast concrete in the grooves 132, and then the concrete is cast.

The third mode is as follows: the pipes embedded in the slab 12 extend from the side of the slab 12 to the outside of the side of the base plate 11, and since the beam coupled to the prefabricated panels has a location of the overlapped layer where post-cast concrete is located, the pipes extending from the outside of the side of the base plate 11 can be connected at the location of the overlapped layer and then cast concrete.

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 slab bottom steel bar 3 disposed on the base plate 11. The base plate 11 and the layer plate 12 are both formed by prefabricating concrete; the contact area of the laminated plate 12 and the substrate 11 is smaller than the area of the substrate 11, and the top surface of the laminated plate 12 is a floor structure finished surface; the plate-bottom reinforcing bars 3 are covered inside the base plate 11. Wherein the area of the base plate 11 not in contact with the slab 12 forms a concrete cast-in-place area. The construction method comprises the following steps:

setting the superposed precast floor slab 1 in place; the composite prefabricated floor slab 1 can be fixed after being butted with a target component through a hoisting and supporting device.

The construction method for arranging the laminated precast floor slab 1 in place can adopt a mode of arranging the vertical supports at the bottoms of the slabs, and can be selected, or can directly arrange supporting floor slabs such as angle steel and the like on slab supports 6, such as walls or beams, so that the installation of the vertical supports can be avoided, and the construction efficiency is improved. Referring to fig. 14, a schematic diagram of the composite precast floor slab adopting angle steel support in construction of the present disclosure, the composite precast floor slab 1 is supported by adopting an angle steel 31 form, 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.

A groove 13 is arranged at the edge of the base plate 11 for connection, and the connecting steel bar 5 is placed in the groove 13; and extending at least a portion of the connecting bars 5 outside the grooves 13; if the plate top steel bars 4 are embedded in the laminated plate 12, corresponding grooves 13 can be formed on the connecting edges of the laminated plate 12; it is now necessary to place the support hogging moment reinforcing bar 7 in the groove 13.

Wherein, the placing mode of connecting reinforcing steel bars 5 or support hogging moment reinforcing steel bars 7 can be one in each groove 13. Optionally, referring to fig. 18a and 18b, which are schematic diagrams illustrating an arrangement manner of connecting rebars or support hogging moment rebars in the groove in the construction method of the laminated precast floor slab of the present disclosure, during the construction process, at least two connecting rebars may be placed in the groove 13, so that the at least two connecting rebars 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 to 200mm, and a connection bar is provided at both sides in the groove 13, respectively. Fig. 18b shows the case that the groove width of the groove 13 is large, the groove width is 200mm-250mm, and a connecting bar is respectively disposed at both sides 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 negative moment reinforcing steel 7 is provided, fig. 18a and 18b are plan views from above, and since the connecting reinforcing steel is located directly below the support negative moment reinforcing steel 7, and thus is hidden from view, the width of the groove 13 and the arrangement positions of the two support negative moment reinforcing steel 7 are the same as those of the two connecting reinforcing steel.

And at least pouring concrete in the concrete cast-in-place area and the groove 13 to form an integral stress plate by the cast-in-place concrete and the laminated prefabricated floor slab 1, and to form connection between the laminated prefabricated floor slab 1 and the target component through the connecting steel bars 5 and the poured concrete.

The height of the poured concrete may be equal to the height of the top surface of the slab 12, such that the top surface of the slab 12 and the top surface of the poured concrete form an integral floor structure finish.

Optionally, the height of the concrete poured in situ may be lower than the height of the top surface of the slab 12, corresponding treatment is performed according to engineering requirements, and then the top surface of the concrete poured in situ and the top surface of the slab 12 form an integrated floor slab structure finished surface through other processes.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode 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/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing 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 may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A composite precast floor slab, comprising:

a base plate prefabricated from concrete;

2. A laminated precast floor slab as set forth in claim 1, wherein at least a part of the edges of the base plate are provided with grooves for receiving connection bars, the grooves extending from the edges to the inner sides of the edges.

3. A laminated precast floor slab as set forth in claim 2, wherein the slab is provided with a slab top reinforcement, and the slab top reinforcement is covered on the inside of the slab.

4. A laminated precast floor slab as set forth in claim 3, wherein at least part of the edges of the slabs are provided with said grooves for receiving connecting bars, said grooves extending from the edges to the inner side of the edges.

5. A laminated precast floor slab as recited in claim 3, wherein said slab bottom reinforcing bars and/or said slab top reinforcing bars are reinforcing meshes.

6. A laminated precast floor slab as recited in any of claims 2 to 5, wherein the thickness of the substrate at the bottom of the groove is in the range of 20mm-60 mm; the total thickness of the substrate and the laminate is not less than 80 mm.

7. A laminated precast floor slab as recited in any of claims 2 to 5, wherein said grooves have a sectional shape of a rectangle, a trapezoid, a V-shape, a semicircle or a door opening.

8. A laminated precast floor slab as set forth in claim 2, wherein the inner wall of said groove is provided with a rugged surface.

9. A laminated precast floor slab as set forth in claim 8, wherein the inner wall of said groove is provided with a corrugation groove to form said rugged surface.

10. A laminated precast floor slab as set forth in any of claims 2 to 5, wherein the grooves are formed in the same width or are enlarged in width in a direction extending from the edge to the inner side of the edge to form a shape of being narrow at the outer side and wide at the inner side.

11. A laminated precast floor slab as set forth in any of claims 2 to 5, wherein the grooves have the same depth or become smaller in a direction extending from the edge to the inside of the edge.

12. A laminated precast floor slab as set forth in claim 11, wherein the bottom surface of said groove includes a slope and/or a step surface.

13. A laminated precast floor slab according to any one of claims 1 to 5, wherein the base plate is embedded with pipeline inside, and the base plate is rectangular;

14. A laminated precast floor slab as recited in any of claims 1 to 5, wherein the slabs are embedded with pipes inside, the slabs being rectangular;

15. A method of constructing a composite precast floor slab as set forth in claim 1, comprising:

setting the laminated precast floor slab in place;

16. A method of constructing a laminated precast floor slab as recited in claim 15, wherein at least two of said coupling bars are placed in said recess so that said at least two coupling bars are spaced apart in the same horizontal plane; or at least two support negative-moment reinforcing steel bars are placed in the groove, so that the at least two support negative-moment reinforcing steel bars are arranged at intervals in the same horizontal plane.