CN211143474U

CN211143474U - Concrete precast slab and connecting structure

Info

Publication number: CN211143474U
Application number: CN201921907887.7U
Authority: CN
Inventors: 聂建国; 杨悦; 陈�光; 聂鑫; 张猛; 马云飞; 樊健生; 王景龙
Original assignee: Tsinghua University; Sany Construction Technology Co Ltd
Current assignee: Tsinghua University; Sany Construction Technology Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-07-31
Anticipated expiration: 2029-11-07

Abstract

The disclosure relates to the field of fabricated buildings, and provides a concrete precast slab and a connecting structure. The concrete precast slab comprises a precast slab body, wherein the top surface of the precast slab body is a floor slab structure finished surface, and slab bottom steel bars. At least part of the edge of the prefabricated plate body is provided with a groove for placing connecting steel bars, and the groove extends from the edge to the inner side of the edge. Also provides a connecting structure of the concrete precast slab. According to the prefabricated wall structure, concrete does not need to be poured on the top surface (the finished surface of the floor slab structure) of the prefabricated plate body in a construction site, the wet operation on the site is reduced, the setting time of the concrete does not need to be waited, the supporting devices of the prefabricated wall and other members can be directly supported and fixed on the floor slab, and the construction efficiency is improved.

Description

Concrete precast slab and connecting structure

Technical Field

The disclosure relates to the field of fabricated buildings, in particular to a concrete precast slab and a connecting structure.

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, the method is to arrange truss steel bars in a precast concrete floor slab, the tops of the truss steel bars are higher than the top surface of the precast floor slab, that is to say, 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 a concrete composite layer is cast in situ, so that the concrete composite floor slab becomes an integral concrete structure and bears load together.

Cast-in-place laminated layers on the concrete precast floor slabs need to be cast with 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 components such as precast walls and the like needs to be fixed on the floor slabs, the process needs to be carried out after the laminated layer concrete is solidified, and the construction efficiency is 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.

SUMMERY OF THE UTILITY MODEL

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 concrete precast slab includes:

the prefabricated slab body is formed by prefabricating concrete, and the top surface of the prefabricated slab body is a floor slab structure finished surface; and

the slab bottom steel bar is arranged at the lower part of the precast slab body and is covered in the precast slab body;

at least part of the edge of the prefabricated plate body is provided with a groove for placing connecting steel bars, 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 prefabricated panel body is rectangular.

According to at least one embodiment of the present disclosure, the slab-bottom reinforcement is a mesh reinforcement.

According to at least one embodiment of the present disclosure, the prefabricated panel body is provided at an upper portion thereof with a sheet top reinforcing bar, and the sheet top reinforcing bar is covered at an inner portion of the prefabricated panel body.

According to at least one embodiment of the present disclosure, the plate-top reinforcing bars are reinforcing meshes.

According to at least one embodiment of the present disclosure, the grooves are uniformly spaced at the edge of the prefabricated panel body.

According to at least one embodiment of the present disclosure, the groove has a cross section in a rectangular shape, a trapezoidal shape, a V shape, or a door opening shape.

According to at least one embodiment of the present disclosure, a pipeline is embedded inside the prefabricated slab body, and the prefabricated slab body is rectangular;

the four corners of the prefabricated slab body are provided with enlarged grooves, and the pipelines extend into the enlarged grooves at the four corners of the prefabricated slab body for connection; or the pipeline is extended 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, 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 another aspect of the present disclosure, a connection structure of a concrete precast slab and a slab support includes:

a plate support; and

the concrete precast slab comprises a precast slab body and slab bottom steel bars; the prefabricated slab body is formed by prefabricating concrete, and the top surface of the prefabricated slab body is a finished floor slab structure 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 concrete precast slabs are symmetrically arranged on two sides of the slab support, the edge of the precast slab body of each concrete precast slab, which is adjacent to the top surface of the slab support, is provided with a groove, the groove extends from the edge to the inner side of the edge, a connecting steel bar is placed in each groove, and at least one part of the connecting steel bar extends to the area where the top surface is located;

concrete is poured at least in the groove and at the top surface, and the plate support and the two precast concrete plates are connected through the connecting steel bars and the poured concrete.

According to at least one embodiment of the present disclosure, the positions of the grooves on the precast slab bodies of the two concrete precast slabs correspond to each other, a support hogging moment steel bar is arranged in each pair of the grooves corresponding to the positions, 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 over 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 the height 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 which is covered inside the prefabricated panel body and extends from one edge of the prefabricated panel body to the opposite other edge.

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 in parallel at intervals; the straight reinforcing steel bars are covered inside the prefabricated panel body between two adjacent grooves, and the length of the straight reinforcing steel bars is smaller than the length of the edge of the prefabricated panel body parallel to the straight reinforcing steel bars.

According to at least one embodiment of the present disclosure, no slab-top reinforcement is provided at an upper portion of the prefabricated slab body; the length of the groove is smaller than the length of the edge of the prefabricated plate 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 precast slab body.

According to at least one embodiment of the present disclosure, at least two connecting steel bars are arranged in the groove, and 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 arranged in the groove and are arranged at intervals in the same horizontal plane.

According to another aspect of the present disclosure, a connecting structure of concrete precast slabs comprises at least two concrete precast slabs, wherein each concrete precast slab comprises a precast slab body and a slab bottom reinforcing steel bar; the prefabricated slab body is formed by prefabricating concrete, and the top surface of the prefabricated slab body is a finished floor slab structure 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 concrete precast slab comprises precast slab bodies, wherein grooves are formed in the opposite edges of the precast slab bodies of two adjacent concrete precast slabs, and the grooves extend from the edges to the inner sides of the edges; connecting steel bars are placed in each groove, at least one part of each connecting steel bar is positioned in the groove on one side, and at least the other part of each connecting steel bar is positioned in the groove on the other side;

concrete is poured at least in the groove, and two adjacent concrete prefabricated plates are connected with the poured concrete through the connecting reinforcing steel bars.

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 an exemplary concrete precast slab 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 cross-section at the 1-1 position in fig. 2.

Fig. 4 is a perspective view illustrating a coupling structure of an exemplary concrete precast slab and a slab support according to the present disclosure.

Fig. 5 is a longitudinal sectional view of a coupling structure of an exemplary concrete precast slab and a slab support according to the present disclosure.

Fig. 6 is a perspective view illustrating a connection structure of an exemplary concrete precast slab to the concrete precast slab according to the present disclosure.

Fig. 7 is a longitudinal sectional view of a connection structure of an exemplary concrete prefabricated panel and a concrete prefabricated panel according to the present disclosure.

FIG. 8 is a schematic view of one embodiment of a groove in an exemplary concrete precast slab according to the present disclosure.

Fig. 9a to 9d are structural diagrams illustrating different sectional shapes of the grooves in the concrete precast slab according to the present disclosure.

Fig. 10a to 10c are schematic views of different variation embodiments of the width of the groove in the concrete precast slab according to the present disclosure.

Fig. 11a and 11b are schematic views of different variations of the bottom surface of the concave groove in the concrete precast slab according to the present disclosure.

Fig. 12a to 12c are schematic views illustrating different arrangements of reinforcing bars corresponding to the slab top in the connection structure of the concrete precast slab according to the present disclosure.

Fig. 13a and 13b are schematic views illustrating the arrangement of connecting reinforcing bars or support hogging moment reinforcing bars in grooves in the connection structure of the concrete precast slabs according to the present disclosure.

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

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 support of components such as prefabricated walls needs 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 concrete precast slabs greatly reduce the efficiency of the industrial production of the concrete precast slab parts, and the distances required by the beard ribs of different projects and plates are different, so that the recycling rate of side molds for manufacturing the concrete precast slabs is low.

In order to solve at least one of the above problems, according to an embodiment of the present disclosure, there is provided a precast concrete slab, referring to a schematic perspective view shown in fig. 1 and a schematic top view shown in fig. 2, the precast concrete slab includes a slab body 1 and a slab-bottom reinforcing steel bar 3, the slab body 1 is precast by casting concrete into a mold, and the shape thereof is not limited herein and may be designed to have various shapes according to the need, such as a general rectangular shape, a square shape, and an L shape or a shape with an arc line, the slab body 1 of the present disclosure is precast directly formed according to the target thickness and shape of a floor slab, the top surface of the slab body 1 is a slab structure finished surface, the slab structure finished surface is a top surface of a structural floor slab according to the use requirement of a reinforced concrete floor slab, it is not necessary to cast concrete on the top surface of the slab body 1 (slab structure finished surface) at a construction site, wet work on the site is reduced, and it is not necessary to wait for a setting time of the precast concrete slab, and a support means for members such as a precast wall can be directly supported and fixed on the.

Referring to the cross-sectional view of fig. 2 at the position 1-1, shown in fig. 3, the slab-bottom steel bars 3 are arranged inside the prefabricated slab body 1, the slab-bottom steel bars 3 are tension bars laid under the slab, the slab-bottom steel bars 3 are arranged at the lower part (position close to the bottom) of the prefabricated slab body 1, and the slab-bottom steel bars 3 of the present disclosure are covered inside the prefabricated slab body 1, and the prefabricated slab body 1 is not protruded from the side surface of the prefabricated slab body 1, i.e. has no beard bars, and has no truss steel bars inside the prefabricated slab body 1. When the concrete precast slab is manufactured, the corresponding slab bottom steel bars 3 are arranged in the mould, then the concrete is poured into the mould to form an integral stress structure, 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 slabs is solved, and the industrial production efficiency of the concrete precast slab is improved. The concrete precast slab of the present disclosure does not need to be provided with truss reinforcing steel bars inside, and the using amount of the reinforcing steel bars is reduced.

In order to realize the function of connecting the beard bars with the adjacent plate or plate support, grooves 2 for placing connecting steel bars 4 are arranged on at least part of the edges (edges for connection) of the prefabricated plate body 1. One end of the groove 2 is arranged at the edge of the precast slab body 1, so that the edge forms a gap, so that the connecting steel bar 4 can extend out of the edge from the gap, the groove 2 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. If the prefabricated plate body 1 is rectangular, a long strip-shaped groove 21 can be formed in the middle area of each side of the prefabricated plate body 1; grooves 22 with larger coverage area, namely enlarged grooves, can be arranged at four corners of the prefabricated plate body 1; for example, the square grooves 22 covering the entire corner regions correspond to the reduction in thickness of the four corners of the prefabricated panel body 1. The section of the groove 21 is not limited to be rectangular, and other shapes such as V-shaped, trapezoid or door-hole shape can be adopted; meanwhile, the shape, width, depth and other parameters of the cross section of the groove 21 along the extending length direction can be changed. During construction, the beard ribs are not provided, the concrete precast slabs can be conveniently hoisted, combined and the like, after the concrete precast slabs are arranged in place, the connecting reinforcing steel bars 4 are placed in the corresponding grooves 2, and then concrete is poured in the grooves 2 in situ, so that the connecting reinforcing steel bars 4 are combined with the cast-in-place concrete to form connection.

Referring to the sectional form of the groove 21 shown in fig. 9a, the section of the groove 21 may be rectangular, and the bottom corners of the rectangular groove 21 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 cross-sectional form of the groove 21 shown in fig. 9b, the cross-section of the groove 21 may take a trapezoidal shape, and the width of the upper portion of the groove 21 is greater than the width 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 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 smooth, for example, rounded or chamfered. Adopt the V-arrangement section, the mould is complicated slightly, but is convenient for demolish, is convenient for pour, and recess 21's bottom has the spacing effect of reinforcing bar concurrently simultaneously.

Referring to the sectional form of the groove 21 shown in fig. 9d, the section of the groove 21 may be a door-opening shape, which means that the lower part of the groove 21 is a semicircular section, and the upper part 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 views of different variation of the groove widths shown in fig. 10a, 10b and 10c, the widths of the grooves 21 may be set to be the same in the direction in which the grooves 21 extend from the edge of the prefabricated panel body 1 where they are located toward the inside of the edge, that is, in the lengthwise direction of the grooves 21 (fig. 10a), or the width of the grooves 21 at the edge of the prefabricated panel body 1 may be set to be smaller than the width of the grooves 21 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. 10b) or it may be wider over part of the length inside the edge (fig. 10 c). The inverted wedge-shaped groove 21 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 and enhancing the anchoring effect, and by adopting the groove with the shape, connecting reinforcing steel bars placed in the groove can be cancelled, and the connection between prefabrication and cast-in-place can be directly realized by the concrete.

Alternatively, see figures 11a and 11b for a schematic view of different variations of the groove bottom surface. The depth of the grooves 21 may be set to be the same in the direction in which the grooves 21 extend from the edge of the prefabricated panel body 1 where they are located toward the inside of the edge, that is, in the length direction of the grooves 21, or the depth of the grooves 21 at the edge of the prefabricated panel body 1 may be set to be greater than the depth of the grooves 21 at the inside of the edge, that is, the depth of the grooves 21 becomes smaller from the outside toward 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 2 may be provided with an uneven surface, for example, as shown in fig. 8, an embodiment of the groove is schematically illustrated, in which the inner wall of the groove 2 is provided with a corrugated groove 21, so that the inner wall of the groove 2 forms a corrugated surface, thereby increasing the contact area with the post-cast concrete after the concrete is cast in the groove 2, and increasing the connection force and the firmness. The inner wall of the groove 2 may be provided with a plurality of pits or a plurality of protrusions, and the inner wall surface of the groove 2 may be formed into an uneven structure, which is not specifically limited herein.

In an alternative embodiment of the present disclosure, the upper part (position near the top) of the prefabricated panel body 1 may be provided with a slab-top steel bar (also referred to as slab-top through long bar), the slab-top through long bar is connected at the slab joint or slab support by a hogging moment steel bar placed at the slotted position, and the slab-top steel 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 any mustache bar. The plate top steel bar is arranged at the upper part of the plate and mainly bears negative bending moment and prevents the plate surface from cracking. When the concrete precast slab is manufactured, the slab bottom steel bars 3 and the slab top steel bars are laid in the mold, and then concrete is poured into the mold. Under the condition that be equipped with reinforcing bar 3 at the bottom of the board and board top reinforcing bar simultaneously, the recess 2 that 1 edge of prefabricated plate body set up need avoid reinforcing bar 3 at the bottom of the board and board top reinforcing bar simultaneously.

The bottom steel bar 3 or the top steel bar can be formed by a plurality of steel bars arranged in parallel and at intervals in the same horizontal plane, the directions of the bottom steel bar 3 and the top steel bar can be the same or vertical to each other, optionally, the bottom steel bar 3 and the top steel bar can both adopt a mesh reinforcement or one of the mesh reinforcements, and the other one adopts another form. 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.

In an alternative embodiment of the present disclosure, the prefabricated panel body 1 may be rectangular. Optionally, the grooves 2 are uniformly distributed at intervals on the whole edge of the prefabricated plate body 1, that is, the four edges of the prefabricated plate 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 groove is located, 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 plate body 1 are provided with square grooves 2 covering the whole corner area, and the arrangement mode is suitable for plates which are connected in two directions, that is, the connection is required in two perpendicular directions. 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, in a manner suitable for panels that are connected unidirectionally, i.e., only in one direction.

In an alternative embodiment of the present disclosure, a pipeline (not shown in the figure) is embedded inside the prefabricated panel body 1, and the prefabricated panel body 1 is configured to be rectangular. The concrete precast 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 prefabricated panel body 1 are provided with the grooves 2, and the grooves 2 can cover the whole corner areas, so that the thickness of the four corners of the prefabricated panel body 1 is reduced, the pipelines embedded in the prefabricated panel body 1 extend into the grooves 2 of the four corners of the prefabricated panel body 1, and the grooves 2 can be connected with each other due to post-cast concrete in the grooves 2, and then concrete is poured.

The second mode is as follows: the pipe lines embedded in the prefabricated panel body 1 are extended from the side of the prefabricated panel body 1, and since the girder coupled with the prefabricated panel has the position of the overlapped layer where the post-cast concrete is located, the pipe lines extended from the side of the prefabricated panel body 1 can be connected at the position of the overlapped layer and then cast with the concrete.

The present disclosure also provides a connection structure of a concrete precast slab and a slab support, referring to a perspective view of the connection structure shown in fig. 4 and a longitudinal sectional view of the connection structure shown in fig. 5. The connecting structure comprises a slab support 6 and two precast concrete slabs. The slab support 6 may be a beam or a wall or the like support for supporting the floor slab. Plate carrier 6 has a flat top surface, and plate carrier 6 may extend in a straight line or in a curved line. In one embodiment, the top surface of the plate support 6 may be provided with beam stirrups 7 protruding upwards, the beam stirrups 7 acting mainly for the beams to shear. The concrete precast slab adopts the concrete precast slab disclosed by the invention, and comprises a precast slab body 1 and slab bottom steel bars 3; the precast slab body 1 is formed by precast concrete, and the top surface of the precast slab body 1 is a floor slab structure finished surface. The plate bottom reinforcing steel bar 3 is arranged at the lower part of the precast slab body 1 and is covered in the precast slab body 1.

The two concrete precast slabs are symmetrically arranged on two sides of the slab support 6 and can be fixed through hoisting and a bracket during construction. The adjacent edge of prefabricated plate body 1 of the prefabricated plate body of first concrete precast slab and the top surface of board support 6 and the adjacent edge of prefabricated plate body 1 of second concrete precast slab and the top surface of board support 6 all are provided with recess 2, and recess 2 extends to the inboard at the edge at place from the edge at place, has all placed connecting reinforcement 4 in every recess 2, and the region at the top surface place of board support 6 is stretched out to at least some of connecting reinforcement 4. The height of the top surface of the plate support 6 is not higher than that of the bottom surface of the groove 2, and the edge of the prefabricated plate body 1 is adjacent to the top surface of the plate support 6, so long as the connecting steel bars 4 extend out of the groove 2, the prefabricated plate can be positioned above the top surface of the plate support 6, and the prefabricated plate can extend out of the area where the top surface of the plate support 6 is located. The connecting steel bars 4 can be arranged in the following two ways:

firstly, two connecting steel bars 4 are placed in a pair of grooves 2 corresponding to the positions, the first connecting steel bars 4 are placed in the grooves 2 of the first concrete precast slab, and the other ends of the first connecting steel bars extend out of the area where the top surface of the slab support 6 is located; the second connecting reinforcement 4 is placed in the groove 2 of the second concrete precast slab, and the other end thereof is extended 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 positioned in the groove 2 of the first concrete precast slab, the other end of the connecting steel bar 4 crosses the area where the top surface of the slab support 6 is positioned and extends into the groove 2 of the second concrete precast slab, and the part of the connecting steel bar 4 crossing the top surface of the slab support 6 is positioned in the area where the top surface of the slab support 6 is positioned.

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 concrete precast slab adopted by the connecting structure is directly precast and formed according to the target thickness and the target shape of the floor slab, the top surface of the precast slab body 1 is a finished surface of the floor slab structure, concrete does not need to be poured on the top surface of the precast slab body 1 in a construction site, the on-site wet operation is reduced, the concrete precast slab does not need to wait for the solidification time of the concrete after being arranged in place, and a supporting device of a precast wall and other components can be directly supported and fixed on the floor slab, so that the construction efficiency is improved. Moreover, the concrete precast slab has no beard rib during construction, the concrete precast slab can be conveniently hoisted, combined and the like, and the construction mode is more flexible.

In an alternative embodiment of the present disclosure, the positions of the recesses 2 on the precast slab body 1 of the first concrete precast slab and the positions of the recesses 2 on the precast slab body 1 of the second concrete precast slab correspond to each other, that is, the extending directions of a pair of the recesses 2 corresponding to the positions of both sides of the slab support 6 are positioned on the same straight line. Support negative-moment reinforcing steel bars 5 are arranged in each pair of grooves 2 corresponding to the positions, and the support negative-moment reinforcing steel bars 5 refer to reinforcing steel bars bearing tensile force generated by negative moment of the plate support positions. One end of the support negative-moment reinforcing steel bar 5 is positioned in the groove 2 on one side, the other end of the support negative-moment reinforcing steel bar 5 spans the plate support 6 and is positioned in the groove 2 on the other side, the support negative-moment reinforcing steel bar 5 is positioned above the connecting reinforcing steel bar 4, and during construction, the support negative-moment reinforcing steel bar 5 can be arranged in the groove 2 after the connecting reinforcing steel bar 4 is placed in the groove 2. Because concrete needs to be poured in the grooves 2 and the top surface area of the plate support 6 to embed the connecting steel bars 4, the beam stirrups 7 (if arranged) and the support hogging moment steel bars 5 into the 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 on the top surface of the precast slab body 1. Therefore, the height of the support hogging moment steel bar 5 is lower than that of the top surface of the precast slab body 1; if the beam stirrups 7 are provided, the height of the beam stirrups 7 should also be lower than the height of the top surface of the precast slab body 1.

Alternatively, see fig. 12a for a schematic view of the concrete precast slab with the steel reinforcing mesh as the slab-top reinforcement. The upper part of the prefabricated panel body 1 is provided with a mesh reinforcement 81, and the mesh reinforcement 81 is covered inside the prefabricated panel body 1 and extends from one edge of the prefabricated panel body 1 to the other opposite edge. In fig. 12a, the prefabricated panel body 1 is rectangular, the mesh reinforcement 81 extends along the length and width of the prefabricated panel body 1, and the reinforcing bars of the mesh reinforcement 81 extend from one edge to the opposite other edge. The groove 2 extends in the direction perpendicular to the edge, the connecting steel bars 4 are placed at the lower part in the groove 2, and the support hogging moment steel bars 5 are placed above the connecting steel bars 4 at the upper part in the groove 2. In this embodiment, the length of the groove 2 can be set to only the length of the steel bar lap joint, and the steel bar mesh 81 can be produced by a welding machine, so that the production is convenient.

Alternatively, see fig. 12b for a schematic view of the concrete precast slab with the slab-top reinforcing bars in the form of straight reinforcing bars. The upper part of the precast slab body 1 is provided with straight steel bars 82 which are arranged in parallel at intervals; the straight reinforcing steel bars 82 are covered inside the prefabricated panel body 1 between two adjacent grooves 2, and the length of the straight reinforcing steel bars 82 is less than the length of the edge of the prefabricated panel body 1 parallel thereto, and the length of the groove 2 of the prefabricated panel body 1 is generally not less than 1/4 of the short-directional span (i.e., the shortest side length) of the prefabricated panel body 1. Alternatively, when the diameter of the connecting reinforcement 4 placed in the groove 2 is larger than the designed reinforcement diameter, the length of the groove 2 can be appropriately shortened. In fig. 12b, the prefabricated panel body 1 is rectangular, and the length of the straight reinforcing steel bars 82 extending inwards 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 bars 4 are placed at the lower part in the groove 2, and the support hogging moment steel bars 5 are placed above the connecting steel bars 4 at the upper part in the groove 2. In this embodiment, the length of the groove 2 can be set to the length of the steel bar lap joint, the length of the straight steel bar 82 is short, the cost of the die is saved, and the forming difficulty is reduced.

Alternatively, see fig. 12c for a schematic view of the concrete slab without the top steel reinforcement. The upper part of the precast slab body 1 is not provided with slab top steel bars; the length of the groove 2 is smaller than the length of the edge of the prefabricated panel body parallel to the groove, and likewise, the length of the groove 2 of the prefabricated panel body 1 is generally not smaller than 1/4 of the short-direction span of the prefabricated panel body 1. Alternatively, when the diameter of the connecting reinforcement 4 placed in the groove 2 is larger than the designed reinforcement diameter, the length of the groove 2 can be appropriately shortened. In fig. 12c, the prefabricated plate body 1 is rectangular, the groove 2 extends in the direction perpendicular to the edge, the connecting steel bars 4 are placed at the lower part in the groove 2, and the support hogging moment steel bars 5 are placed at the upper part in the groove 2 and above the connecting steel bars 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 the steel bar material is low.

Optionally, according to the requirement of the construction process, the height of the poured concrete may also 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 by other processes.

Alternatively, referring to fig. 13a and 13b, which are schematic diagrams illustrating the arrangement of the connecting reinforcing steel bars or the hogging moment reinforcing steel bars in the grooves in the connecting structure of the concrete precast slabs according to the present disclosure, in the connecting structure of the concrete precast slabs and the slab support, at least two connecting reinforcing steel bars may be arranged in the grooves 2, and the at least two connecting reinforcing steel bars are arranged at intervals in the same horizontal plane. Fig. 13a shows the case that 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 the case that 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 reinforcing steel bars 5 can be arranged in the groove 2, and the at least two support hogging moment reinforcing steel bars 5 are arranged at intervals in the same horizontal plane. In the case where the support negative moment reinforcing steel 5 is provided, fig. 13a and 13b are plan views seen from above, and since the connecting reinforcing steel is located directly below the support negative moment reinforcing steel 5, not shown by shading, the width of the groove 2 and the arrangement positions of the two support negative moment reinforcing steel 5 are the same as those of the two connecting reinforcing steel.

The present disclosure also provides a connection structure of concrete precast slabs, referring to a schematic perspective view of the connection structure shown in fig. 6 and a cross-sectional longitudinal view of the connection structure shown in fig. 7. The connecting structure comprises at least two concrete precast slabs, and the concrete precast slabs adopt the concrete precast slabs disclosed by the disclosure and comprise precast slab bodies 1 and slab bottom steel bars 3. The precast slab body 1 is formed by precast concrete, and the top surface of the precast slab body 1 is a floor slab structure finished surface. The plate bottom reinforcing steel bar 3 is arranged at the lower part of the precast slab body 1 and is covered in the precast slab body 1.

Among two adjacent concrete prefabricated slabs, the edge of the prefabricated slab body 1 of the first concrete prefabricated slab and the edge of the prefabricated slab body 1 of the opposite second concrete prefabricated slab are both provided with a groove 2, and the groove 2 extends from the edge to the inner side of the edge. The grooves 2 on the first concrete precast slab correspond to the grooves 2 on the second concrete precast slab in position, namely, the extending directions of the pair of grooves 2 corresponding to the positions are on the same straight line. Connecting reinforcing steel bars 4 are placed in each groove 2, at least one part of each connecting reinforcing steel bar 4 is located in the groove 2 on one side, and at least the other part of each connecting reinforcing steel bar 4 is located in the groove 2 on the other side. The connecting steel bars 4 can be arranged in the following ways:

firstly, two connecting steel bars 4 are placed in a pair of grooves 2 corresponding to the positions, the first connecting steel bars 4 are placed in the grooves 2 of the first concrete precast slab, and the other ends of the first connecting steel bars extend into the grooves 2 of the second concrete precast slab; the second connecting steel bar 4 is arranged in the groove 2 of the second concrete precast slab, and the other end of the second connecting steel bar extends into the groove 2 of the first concrete precast slab.

Secondly, a connecting steel bar 4 is arranged in the pair of grooves 2 corresponding to the positions, one end of the connecting steel bar 4 is positioned in the groove 2 of the first concrete precast slab, and the other end of the connecting steel bar 4 extends into the groove 2 of the second concrete precast slab.

Concrete is poured at least in the groove 2, and two adjacent concrete precast slabs are connected with the poured concrete through connecting steel bars 4.

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:

the concrete precast slab and the slab support 6 are arranged in place; two concrete prefabricated panels can be aligned along the extension direction of the top surface of the panel support 6 by means of hoisting and supporting devices and symmetrically fixed on both sides of the panel support 6.

The construction method for arranging the concrete precast slabs in place can adopt a mode of arranging the vertical supports at the bottoms of the slabs, and can also adopt an optional mode of directly arranging supporting floor slabs such as angle steel 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 concrete precast slab of the present disclosure is supported by angle steel 31 in a construction process, wherein the concrete precast slab is supported by the upper end surface of the angle steel 31, and the other end surface of the angle steel 31 is fixedly connected to the slab support 6 by bolts.

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 of 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 the description is omitted; and

concrete is poured at least in the groove 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. When pouring, the required auxiliary template can be arranged on the connecting structure, and the concrete is limited in a required range.

The height of the poured concrete may be equal to the height of the top surface of the precast slab body 1, which allows the connection 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 finished surface. If the beam stirrups 7 are provided, the beam stirrups 7 are also covered with cast-in-place concrete.

Optionally, 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 performed according to engineering requirements, and then the top surface of the whole connecting structure forms a 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 concrete precast slab, characterized by comprising:

2. The concrete precast panel according to claim 1, wherein the precast panel body has a rectangular shape.

3. The concrete precast slab of claim 2, wherein the slab-bottom reinforcing steel is a mesh reinforcement.

4. The concrete precast panel according to claim 3, wherein a panel top reinforcing bar is provided at an upper portion of the precast panel body, and the panel top reinforcing bar is covered at an inner portion of the precast panel body.

5. The concrete precast panel according to claim 4, wherein the panel top reinforcing bars are reinforcing mesh.

6. The concrete precast panel according to claim 2, wherein the recesses are uniformly spaced at the edge of the precast panel body.

7. The concrete precast panel according to any one of claims 1 to 6, wherein the groove has a cross-section of a rectangular shape, a trapezoidal shape, a V-shape or a door-hole shape.

8. The concrete precast slab as recited in any one of claims 1 or 3 to 6, wherein a pipeline is pre-embedded in the precast slab body, and the precast slab body is rectangular;

9. The concrete precast panel according to any one of claims 1 to 6, wherein the inner wall of the groove is provided with an uneven surface.

10. The concrete precast panel according to claim 9, wherein the inner wall of the groove is provided with a corrugation groove to form the rugged surface.

11. The concrete precast panel according to any one of claims 1 to 6, wherein the grooves have the same width or the width becomes larger in a direction extending from the edge to the inner side of the edge to form a shape having a narrow outer side and a wide inner side.

12. The concrete precast panel according to any one of claims 1 to 6, wherein the depth of the grooves is the same or becomes smaller in a direction in which the grooves extend from the edge to the inside of the edge.

13. The concrete precast panel according to claim 12, wherein the bottom surface of the recess includes a slanted surface and/or a stepped surface.

14. A connecting structure of a concrete precast slab and a slab support is characterized by comprising:

a plate support; and

the two concrete precast slabs are symmetrically arranged on two sides of the slab support, the edge of the precast slab body of each concrete precast slab, which is adjacent to the top surface of the slab support, is provided with a groove, the groove extends from the edge to the inner side of the edge, a connecting steel bar is placed in each groove, and at least one part of the connecting steel bar extends out of the area of the top surface of the slab support;

concrete is poured at least in the groove and at the top surface of the plate support, and the plate support and the two precast concrete plates are connected through the connecting steel bars and the poured concrete.

15. The structure as claimed in claim 14, wherein the recesses of the precast slab bodies of the two concrete precast slabs are positioned to correspond to each other, support hogging moment reinforcing bars are provided in each pair of the recesses at the corresponding positions, one end of each support hogging moment reinforcing bar is positioned in the recess at one side, the other end of each support hogging moment reinforcing bar spans the slab support and is positioned in the recess at the other side, the support hogging moment reinforcing bars are positioned above the connecting reinforcing bars, and the height of each support hogging moment reinforcing bar is lower than the height of the top surface of the precast slab body.

16. The structure of claim 15, wherein the prefabricated panel body is provided at the upper portion thereof with a reinforcing mesh which is covered inside the prefabricated panel body and extends from one edge of the prefabricated panel body to the opposite other edge thereof.

17. The structure as claimed in claim 15, wherein the prefabricated panel body is provided at an upper portion thereof with parallel and spaced straight reinforcing bars; the straight reinforcing steel bars are covered inside the prefabricated panel body between two adjacent grooves, and the length of the straight reinforcing steel bars is smaller than the length of the edge of the prefabricated panel body parallel to the straight reinforcing steel bars.

18. The structure of claim 15, wherein no slab-top reinforcement is provided at the upper portion of the prefabricated slab body; the length of the groove is smaller than the length of the edge of the prefabricated plate body parallel to the groove.

19. The structure of any one of claims 14 to 18, wherein the height of the poured concrete is not higher than the height of the top surface of the precast slab body.

20. A structure as claimed in any one of claims 15 to 18, wherein at least two of said attachment bars are provided in said recess, at least two of said attachment bars being spaced apart in the same horizontal plane; or at least two support negative-moment reinforcing steel bars are arranged in the groove and are arranged at intervals in the same horizontal plane.

21. A connecting structure of a concrete precast slab and a concrete precast slab is characterized by comprising at least two concrete precast slabs, wherein each concrete precast slab comprises a precast slab body and a slab bottom reinforcing steel bar; the prefabricated slab body is formed by prefabricating concrete, and the top surface of the prefabricated slab body is a finished floor slab structure 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;