CN211143474U - Precast concrete slabs and connecting structures - Google Patents

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

Precast concrete slabs and connecting structures

technical field

The present disclosure relates to the field of prefabricated buildings, in particular to a concrete prefabricated panel and a connection structure.

Background technique

Prefabricated buildings refer to buildings assembled on site using prefabricated components. The advantages of this kind of building are fast construction speed, less restricted by climatic conditions, labor saving and improved construction quality. At present, in the assembly of monolithic concrete structures, reinforced concrete composite floors are generally used. The method is to set truss steel bars in the prefabricated concrete floor slabs, and the tops of the truss steel bars are higher than the top surface of the prefabricated floor slabs. The surface is not the final finished surface of the structural floor, but exposed truss steel bars, which are covered by the truss steel bars when pouring the concrete stack on site, making it an integral concrete structure to bear the load together.

The cast-in-place superimposed layer on the concrete prefabricated floor needs to pour a large amount of concrete on site, and there are many wet operations, and the solidification of the superimposed layer concrete takes a certain time, and the support of the prefabricated wall and other components needs to be fixed on the floor, this process must be It can only be carried out after the superimposed layer concrete is solidified, resulting in low construction efficiency.

Usually, the side of the precast concrete slab needs to protrude steel bars (beard bars) to realize the connection with the adjacent plates or plate supports, and the existence of the beard bars greatly reduces the efficiency of industrial production of precast concrete panels, and different projects, The spacing required for the beard bars of different plates is not the same, which leads to the low reuse rate of the side formwork for making the precast concrete panels.

Utility model content

In order to solve at least one of the above technical problems, the present disclosure provides the following.

According to one aspect of the present disclosure, a precast concrete panel includes:

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

plate bottom reinforcement, arranged at the lower part of the prefabricated plate body and covered inside the prefabricated plate body;

Wherein, at least part of the edge of the prefabricated board body is provided with a groove for placing the 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 steel bar at the bottom of the slab is a steel mesh.

According to at least one embodiment of the present disclosure, the upper part of the prefabricated panel body is provided with a panel top reinforcement, and the panel top reinforcement is covered inside the prefabricated panel body.

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

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

According to at least one embodiment of the present disclosure, the cross section of the groove is rectangular, trapezoidal, V-shaped or door-shaped.

According to at least one embodiment of the present disclosure, pipelines are pre-embedded inside the prefabricated panel body, and the prefabricated panel body is rectangular;

The four corners of the prefabricated board body are provided with enlarged grooves, and the pipeline protrudes into the enlarged grooves at the four corners of the prefabricated board body for connection; The side surface of the prefabricated board body protrudes for connection.

According to at least one embodiment of the present disclosure, the inner wall of the groove is provided as an uneven surface.

According to at least one embodiment of the present disclosure, the inner wall of the groove is provided with a corrugated groove to form the uneven surface.

According to at least one embodiment of the present disclosure, in the 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 becomes larger, so as to form an outer narrow inner wide shape.

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 depth of the groove is the same or the depth of the groove becomes smaller.

According to at least one embodiment of the present disclosure, the bottom surface of the groove includes a sloped surface and/or a stepped surface.

According to another aspect of the present disclosure, a connection structure of a precast concrete slab and a slab support, comprising:

plate supports; and

A precast concrete slab, comprising a prefabricated slab body and a slab bottom steel bar; the prefabricated slab body is formed by prefabrication of concrete, and the top surface of the prefabricated slab body is a floor structure completion surface; the slab bottom reinforcing bar is arranged on the prefabricated slab body The lower part of the prefabricated panel body is covered;

Wherein, the two prefabricated concrete slabs are symmetrically arranged on both sides of the slab support, and the edges of the prefabricated slab body of each of the prefabricated concrete slabs adjacent to the top surface of the slab support are provided with grooves, the grooves extend from the edge to the inner side of the edge, each of the grooves is provided with connecting steel bars, and at least a part of the connecting steel bars 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 prefabricated concrete plates are connected by 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 board bodies of the two precast concrete panels correspond to each other, and each pair of the grooves corresponding to the positions is provided with a support negative bending One end of the negative bending moment bar of the support is located in the groove on one side, and the other end of the negative bending moment steel bar of the support spans the plate support and is located in the groove of the other side. In the groove, the negative bending moment reinforcing bar of the support is located above the connecting reinforcing bar, and the height of the negative bending moment reinforcing bar of the support is lower than the height of the top surface of the prefabricated panel body.

According to at least one embodiment of the present disclosure, the upper part of the prefabricated panel body is provided with a reinforcing mesh, the reinforcing mesh is covered inside the prefabricated panel body and extends from one edge of the prefabricated panel body to the other opposite. an edge.

According to at least one embodiment of the present disclosure, the upper part of the prefabricated panel body is provided with straight steel bars arranged in parallel and spaced apart; the straight steel bars are covered inside the prefabricated panel body between two adjacent grooves , and the length of the straight steel bar is less than the length of the edge of the prefabricated panel body parallel to it.

According to at least one embodiment of the present disclosure, the upper part of the prefabricated panel body is not provided with top reinforcement bars; the length of the groove is smaller than the length of the edge of the prefabricated panel body parallel to it.

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 panel body.

According to at least one embodiment of the present disclosure, at least two connecting bars are arranged in the groove, and at least two connecting bars are arranged at intervals in the same horizontal plane; or at least two connecting bars are arranged in the groove. The negative bending moment steel bars of the support are arranged at intervals in the same horizontal plane.

According to another aspect of the present disclosure, a connection structure of a precast concrete panel and a precast concrete panel includes at least two precast concrete panels, the precast concrete panels include a precast panel body and a steel bar at the bottom of the panel; the precast panel body is made of concrete It is prefabricated, and the top surface of the prefabricated board body is the finished surface of the floor structure; the bottom reinforcement bars are arranged on the lower part of the prefabricated board body and are covered inside the prefabricated board body;

Wherein, the opposite edges of the precast board bodies of the two adjacent precast concrete boards are provided with grooves, and the grooves extend from the edge to the inner side of the edge; Connecting steel bars are placed in all of them, at least a part of the connecting steel bars is located in the groove on one side, and at least another part of the connecting steel bars is located in the groove on the other side;

The concrete is poured in at least the groove, and the two adjacent precast concrete slabs are connected by the connecting steel bar and the poured concrete.

Description of drawings

The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure, are included to provide a further understanding of the disclosure, and are incorporated in and constitute the present specification part of the manual.

FIG. 1 is a schematic perspective view of an exemplary precast concrete panel according to the present disclosure.

2 is a schematic top view of an exemplary precast concrete panel according to the present disclosure.

FIG. 3 is a cross-sectional view of a section at position 1-1 in FIG. 2 .

4 is a perspective structural schematic diagram of an exemplary connection structure of a precast concrete slab and a slab support according to the present disclosure.

5 is a longitudinal cross-sectional view of an exemplary precast concrete panel and panel support connection structure according to the present disclosure.

FIG. 6 is a schematic perspective view of the connection structure of an exemplary precast concrete panel and a precast concrete panel according to the present disclosure.

7 is a longitudinal cross-sectional view of an exemplary precast concrete panel-to-concrete panel connection structure according to the present disclosure.

8 is a schematic diagram of one embodiment of a groove in an exemplary precast concrete panel according to the present disclosure.

9a to 9d are structural schematic diagrams of different cross-sectional shapes of grooves in a precast concrete slab of the present disclosure.

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

Figures 11a and 11b are schematic views of different variation embodiments of the bottom surface of the groove in the precast concrete slab of the present disclosure.

Figures 12a to 12c are schematic diagrams illustrating different arrangements of reinforcement bars on the top of the corresponding slabs in the connection structure of the precast concrete slabs of the present disclosure.

Figures 13a and 13b are schematic diagrams of the arrangement of the connecting steel bars in the grooves or the negative bending moment steel bars of the support in the connection structure of the precast concrete slabs of the present disclosure.

FIG. 14 is a schematic diagram of the use of angle steel support in the construction of the precast concrete slab of the present disclosure.

Detailed ways

The present disclosure will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related content, but not to limit the present disclosure. In addition, it should be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings.

It should be noted that the embodiments of the present disclosure and the features of the embodiments may be combined with each other unless there is conflict. The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

The existing reinforced concrete composite floor slab needs to be poured on-site on the entire prefabricated part, and the truss steel bar needs to be arranged at the superimposed surface of the cast-in-place part and the prefabricated part, and the existence of the truss steel bar obviously increases the steel content of the floor ( The steel content per unit area) increases the cost of the building structure and becomes an important obstacle to the development of prefabricated buildings. During construction, a large amount of concrete needs to be poured on site, and there are many wet operations, and the solidification of the superimposed layer concrete takes a certain time, and the support of prefabricated walls and other components needs to be fixed on the floor. This process must wait for the superimposed layer concrete to solidify. can be carried out, resulting in low construction efficiency.

In addition, the beard bars of the precast concrete panels currently used greatly reduce the efficiency of the industrialized production of the precast concrete panels, and the spacing required for the beard bars of different projects and plates is not the same, resulting in the side molds for making the precast concrete panels. Low reuse rate.

In order to solve at least one of the above existing technical problems, according to an embodiment of the present disclosure, a prefabricated concrete panel is provided, see the schematic three-dimensional structure shown in FIG. 1 and the schematic top view shown in FIG. 2 . The prefabricated concrete panel includes a prefabricated panel body 1 and a panel bottom steel bar 3 . The prefabricated panel body 1 is prefabricated by pouring concrete into a mold, and its shape is not limited here, and can be designed into different shapes according to requirements, such as a common rectangle, a square, and an L shape or a shape with an arc. The prefabricated panel body 1 of the present disclosure is directly prefabricated according to the target thickness and shape of the floor slab. The top surface of the prefabricated panel body 1 is the floor slab structure completion surface, and the floor slab structure completion surface is the top surface of the structural floor slab that meets the use requirements of the reinforced concrete floor slab. The construction site does not need to pour concrete on the top surface of the precast panel body 1 (the finished surface of the floor structure), which reduces the wet work on the site, and after the concrete precast panel is set in place, there is no need to wait for the solidification time of the concrete, and the support device for the precast wall and other components It can be directly supported and fixed on the floor, which improves the construction efficiency.

Referring to the cross-sectional view of the section at 1-1 in FIG. 2 shown in FIG. 3 , the bottom steel bar 3 is provided inside the prefabricated panel body 1 , and the bottom steel bar 3 is the tension bar laid under the panel, and the bottom steel bar 3 Arranged at the lower part of the prefabricated panel body 1 (closer to the bottom), the panel bottom reinforcement bars 3 of the present disclosure are covered inside the prefabricated panel body 1 , and do not protrude from the prefabricated panel body 1 from the side of the prefabricated panel body 1 , that is, there is no There is no truss reinforcement in the interior of the prefabricated panel body 1 either. When making the concrete prefabricated panel of the present disclosure, the corresponding bottom steel bars 3 are set in the mold, and then concrete is poured into the mold to form an integral stress-bearing structure, which avoids the different distances required by the beard bars for different projects and different plates. In the same way, it leads to the problem of low reusability of side molds for making precast concrete panels, which improves the efficiency of industrial production of precast concrete panels. The interior of the prefabricated concrete panel of the present disclosure does not need to set truss steel bars, which reduces the amount of steel bars used.

In order to realize the function of connecting the beard bars with adjacent plates or plate supports, grooves 2 for placing connecting bars 4 are provided on at least part of the edges of the prefabricated panel body 1 (edges used for connection). One end of the groove 2 is opened on the edge of the prefabricated board body 1, so that the edge forms a gap, so that the connecting steel bar 4 can extend from the gap. Extension, the direction of extension can be the main force direction. If the prefabricated board body 1 is set as a rectangle, a long groove 21 can be opened in the middle area of each side of the prefabricated board body 1; That is, an enlarged groove; for example, a square groove 22 covering the entire corner area, which is equivalent to reducing the thickness of the four corners of the prefabricated board body 1 . The cross-section of the groove 21 is not limited to a rectangle, and other shapes such as V-shaped, trapezoidal or door-shaped can also be used; meanwhile, the groove 21 can also change parameters such as the shape, width and depth of the cross-section along the extended length direction. During construction, without the beard bars, the precast concrete panels can be easily hoisted, assembled, etc. After being set in place, the connecting bars 4 can be placed in the corresponding grooves 2, and then concrete is poured on site in the grooves 2. , so that the connecting steel bar 4 is combined with the cast-in-place concrete to form a connection.

Referring to the cross-sectional form of the groove 21 shown in FIG. 9 a , the cross-section of the groove 21 can be rectangular, and the bottom corners of the rectangular groove 21 can be rounded. Production molds with rectangular cross-sections are simple, with rounded corners at the bottom to facilitate mold removal.

Referring to the cross-sectional form of the groove 21 shown in FIG. 9b, the cross-section of the groove 21 can be a trapezoid, and the width of the upper part of the groove 21 is greater than the width of the bottom part. The mold of this shape is slightly complicated, but it is easy to dismantle, which is convenient for pouring and realizes a large width of tooth bottom and groove top.

Referring to the cross-sectional form of the groove 21 shown in FIG. 9c, the cross-section of the groove 21 can be V-shaped, and the bottom of the V-shaped groove 21 can be slightly smoothed, for example, rounded or flattened. With a V-shaped section, the mold is a little more complicated, but it is easy to dismantle and pour. At the same time, the bottom of the groove 21 has the function of limiting the position of the steel bar.

Referring to the cross-sectional form of the groove 21 shown in FIG. 9d, the cross-section of the groove 21 can be in the shape of a door hole, and the door hole shape means that the lower part of the groove 21 adopts a semicircular section, and the top of the semicircular section is a rectangular section, and the two The cross-sections of various shapes are combined to form a door-shaped cross-section. With the cross section of this shape, the mold is more complicated, but it is easy to dismantle the mold.

Optionally, referring to the schematic diagrams of different variations of groove widths shown in FIGS. 10a, 10b and 10c, in the direction in which the groove 21 extends from the edge of the prefabricated board body 1 where it is located to the inner side of the edge, that is, In the length direction of the grooves 21, the widths of the grooves 21 can be set to be the same (FIG. 10a), or the width of the grooves 21 at the edge of the prefabricated board body 1 can be set to be smaller than the width of the grooves 21 inside the edge to form Inverted wedge with narrow outside and wide inside. It can widen gradually (Fig. 10b) or over part of the length inside the edge (Fig. 10c). The use of an inverted wedge-shaped groove 21 with a narrow outside and wide inside is conducive to the formation of an inverted wedge shape by pouring concrete into the groove and enhancing the anchoring effect. With this form of groove, it is possible to eliminate the connecting steel bars placed behind the groove and directly realize the realization of the concrete. Precast and cast-in-place connections.

Optionally, please refer to the schematic diagrams of different variations of the groove bottom surface shown in FIG. 11a and FIG. 11b. In the direction in which the groove 21 extends from the edge of the prefabricated board body 1 to the inner side of the edge, that is, in the length direction of the groove 21, the depth of the groove 21 can be set to be the same, or the edge of the prefabricated board body 1 can be set to have the same depth. The depth of the groove 21 is set to be larger than the depth of the groove 21 inside the edge, that is, the depth of the groove 21 becomes smaller from the outside to the inside. For example, the bottom surface of the groove may include a sloped surface gradually inclined from the inside to the outside or a stepped surface with a step-like change, or may include both a sloped surface and a stepped surface. The effect of using a smaller groove depth from the outside to the inside is that the lower connecting bars need a shorter length and the upper connecting bars need a longer length. In addition, this method can reduce the amount of post-cast concrete on site, and the shallower the groove, the easier the demoulding and the more convenient the production.

Optionally, the inner wall of the groove 2 can be set as an uneven surface, such as the schematic diagram of an embodiment of the groove shown in FIG. 8 , in this embodiment, the inner wall of the groove 2 The inner wall of the groove 2 forms a corrugated surface, so as to increase the contact area with the post-cast concrete after the concrete is poured in the groove 2, and increase the connection force and firmness. Multiple pits or multiple protrusions may also be provided on the inner wall of the groove 2, as long as the inner wall surface of the groove 2 is formed into an uneven structure, which is not specifically limited here.

In an optional embodiment of the present disclosure, the upper part of the prefabricated panel body 1 (the position near the top) may be provided with panel top reinforcement bars (also referred to as panel top long bars), which are located at the panel seams or The plate support is connected by the negative bending moment steel bars placed at the slotted part, and the top steel bars are covered inside the prefabricated plate body 1, and the prefabricated plate body 1 does not protrude from the side of the prefabricated plate body 1, that is, there is no mustache bar. . The top steel bar is the steel bar set on the upper part of the board, which mainly bears the negative bending moment and prevents the cracking of the board surface. When making a concrete precast slab, first lay the bottom steel bars 3 and the slab top steel bars in the mold, and then pour concrete into the mold. In the case where the bottom steel bars 3 and the top steel bars are provided at the same time, the grooves 2 provided on the edge of the prefabricated board body 1 need to avoid the bottom steel bars 3 and the top steel bars at the same time.

The steel bars at the bottom of the slab 3 or the steel bars on the top of the slab can be composed of multiple steel bars arranged in parallel and spaced in the same horizontal plane. The direction of the steel bars at the bottom of the slab 3 and the steel bars on the slab top can be the same or perpendicular to each other. The top steel bars can all be made of steel mesh or one of them can be made of steel mesh, and the other one can be made of other forms. Reinforcement mesh is a mesh made of longitudinal and transverse steel bars crossed by binding or welding. It is a flat structure. The use of steel mesh can improve the quality of steel reinforcement works, increase the construction speed, and enhance the crack resistance of concrete.

In an optional embodiment of the present disclosure, the prefabricated board body 1 may be rectangular. Optionally, the grooves 2 are evenly spaced along the entire edge of the prefabricated board body 1, that is, the four edges of the prefabricated board body 1 are provided with a plurality of grooves 2, and the plurality of grooves 2 are arranged along each edge of the prefabricated board body 1. The length direction of each edge is distributed, the extending direction of the groove 2 is perpendicular to the edge where it is located, and the extending direction of the groove 2 of one set of opposite edges is perpendicular to the extending direction of the groove 2 of the other set of opposite edges. Each corner is provided with a square groove 2 covering the entire corner area. This arrangement is suitable for boards that are connected in two directions, that is, connections are required in both vertical directions. However, the present disclosure is not limited to this, and the grooves 2 can also be arranged only on one set of two opposite edges, that is, on opposite sides. This setting method is suitable for boards that are connected in one direction, that is, the grooves 2 only need to be arranged in one direction. connect.

In an optional embodiment of the present disclosure, pipelines (not shown in the figure) are pre-embedded in the prefabricated board body 1, and the prefabricated board body 1 is set in a rectangular shape. The precast concrete panels are spliced into a whole on site, and the pipelines in each precast panel need to be connected at the construction site. The connection of pipelines means that the pipelines are connected on site and then concrete is poured. Therefore, the connection of pipelines needs to be carried out in places with post-poured concrete. According to different connection positions, the following two different implementation structures are provided.

The first way: the four corners of the prefabricated board body 1 are provided with grooves 2, and the grooves 2 can cover the entire corner area, thereby reducing the thickness of the four corners of the prefabricated board body 1, and the prefabricated board body 1 The embedded pipelines extend into the grooves 2 at the four corners of the prefabricated board body 1. Since there is post-cast concrete in the grooves 2, connections can be made in the grooves 2, and then concrete is poured.

The second way: the pipeline embedded in the prefabricated panel body 1 protrudes from the side of the prefabricated panel body 1. Since the beams matched with the prefabricated panel have the position of the superimposed layer, and there is post-cast concrete at the position of the superimposed layer, so The pipeline extending from the side of the precast panel body 1 can be connected at the position of the superimposed layer, and then concrete is poured.

The present disclosure also provides a connection structure between a precast concrete slab and a slab support, please refer to the three-dimensional schematic diagram of the connection structure shown in FIG. 4 and the longitudinal cross-sectional view of the connection structure shown in FIG. 5 . The connecting structure includes a plate support 6 and two prefabricated concrete plates. The slab support 6 may be a support such as a beam or a wall for supporting the floor slab. The board support 6 has a flat top surface, and the board support 6 can extend along a straight line or along a curve. In one embodiment, the top surface of the plate support 6 may be provided with beam stirrups 7 extending upward, and the function of the beam stirrups 7 is mainly for beam shear resistance. The prefabricated concrete slab adopts the prefabricated concrete slab of the present disclosure, including a prefabricated slab body 1 and a slab bottom steel bar 3; the prefabricated slab body 1 is formed by prefabrication of concrete, and the top surface of the prefabricated slab body 1 is the finished surface of the floor structure. The bottom reinforcement bars 3 are arranged at the lower part of the prefabricated panel body 1 and covered inside the prefabricated panel body 1 .

Among them, two prefabricated concrete slabs are symmetrically arranged on both sides of the slab support 6, and can be fixed by hoisting and brackets during construction. The edge of the precast board body 1 of the first precast concrete board and the top surface of the board support 6 and the edge of the precast board body 1 of the second precast concrete board and the top surface of the board support 6 are provided with grooves 2. The grooves 2 extend from the edge to the inner side of the edge. Each groove 2 is provided with a connecting steel bar 4, and at least a part of the connecting steel bar 4 extends to the area where the top surface of the plate support 6 is located. The height of the top surface of the board support 6 is not higher than the height of the bottom surface of the groove 2. Since the edge of the prefabricated board body 1 is adjacent to the top surface of the board support 6, as long as the connecting steel bars 4 protrude out of the groove 2, That is, it can be located above the top surface of the plate support 6 so as to extend to the area where the top surface of the plate support 6 is located. The connection bar 4 can be set in the following two ways:

The first is that two connecting bars 4 are placed in a pair of grooves 2 corresponding to the positions. The first connecting bars 4 are placed in the grooves 2 of the first precast concrete slab, and the other end protrudes to the top of the slab support 6 The second connecting bar 4 is placed in the groove 2 of the second precast concrete slab, and the other end protrudes to the area where the top surface of the slab support 6 is located.

In the second type, a pair of connecting bars 4 is placed in a pair of grooves 2 corresponding to the position. The area protrudes into the groove 2 of the second precast concrete slab, and the part of the connecting steel bar 4 that crosses the top surface of the panel support 6 is located in the area where the top surface of the panel support 6 is located.

The concrete is poured at least in the groove 2 and at the top surface of the plate support 6, and the plate support 6 and the two precast concrete slabs are connected by connecting the steel bars 4 and the poured concrete.

The concrete prefabricated slab used in the connection structure is directly prefabricated according to the target thickness and shape of the floor slab. The top surface of the prefabricated slab body 1 is the finished surface of the floor slab structure, and there is no need to pour concrete on the top surface of the prefabricated slab body 1 at the construction site. Wet work on site is reduced, and there is no need to wait for the solidification time of the concrete after the precast concrete slab is set in place. The support device of the prefabricated wall and other components can be directly supported and fixed on the floor slab, which improves the construction efficiency. In addition, the prefabricated concrete slab has no mustache bars during construction, and the prefabricated concrete slab can be easily hoisted, assembled, and other operations, and the construction method is more flexible.

In an optional embodiment of the present disclosure, the position of the groove 2 on the precast panel body 1 of the first precast concrete panel corresponds to the position of the groove 2 on the precast panel body 1 of the second precast concrete panel, that is, The extending directions of the pair of grooves 2 corresponding to the two sides of the plate support 6 are located on the same straight line. Each pair of grooves 2 corresponding to the position is provided with a support negative bending moment steel bar 5, and the support negative bending moment steel bar 5 refers to a steel bar that bears the tensile force generated by the negative bending moment of the plate support position. One end of the negative bending moment steel bar 5 of the support is located in the groove 2 on one side, and the other end of the negative bending moment steel bar 5 of the support spans the plate support 6 and is located in the groove 2 on the other side. The moment steel bar 5 is located above the connecting steel bar 4. During construction, after placing the connecting steel bar 4 in the groove 2, the support negative bending moment steel bar 5 can be arranged in the groove 2. Due to the need to pour concrete in the groove 2 and the top surface area of the plate support 6, the connecting reinforcement 4, the beam stirrup 7 (if provided) and the bearing negative moment reinforcement 5 are buried in the cast-in-place concrete. , and the concrete surface after pouring needs to be leveled with the top surface of the precast panel body 1 , and it is no longer necessary to pour concrete on the top surface of the precast panel body 1 . Therefore, the height of the negative bending moment reinforcement bar 5 of the support is lower than the height of the top surface of the prefabricated panel body 1; .

Optionally, see Fig. 12a, a schematic diagram showing that the top reinforcement of the precast concrete slab is in the form of reinforcement mesh. The upper part of the prefabricated panel body 1 is provided with a reinforcing mesh 81 , which is covered inside the prefabricated panel body 1 and extends from one edge of the prefabricated panel body 1 to the opposite edge. In Fig. 12a, the prefabricated panel body 1 is rectangular, the reinforcing mesh 81 extends in the length and width directions of the entire prefabricated panel body 1, and the reinforcing bars of the reinforcing mesh 81 extend from one edge to the opposite edge. The groove 2 extends in a direction perpendicular to the edge, the lower part of the groove 2 is placed with a connecting bar 4, and the upper part of the groove 2 is placed above the connecting bar 4 to place the support negative bending moment steel bar 5. In this embodiment, the length of the groove 2 can only be opened to the length of the overlapping of the steel bars, and the steel mesh 81 can be produced by a welding machine, which is convenient for production.

Optionally, see FIG. 12b , a schematic diagram showing that the top reinforcement bars of the concrete precast slab are in the form of straight reinforcement bars. The upper part of the prefabricated panel body 1 is provided with straight bars 82 arranged in parallel and spaced apart; the straight bars 82 are covered in the interior of the prefabricated panel body 1 between the two adjacent grooves 2, and the length of the straight bars 82 is less than that of the prefabricated panel parallel to it. The edge length of the board body 1, and the length of the groove 2 of the prefabricated board body 1 is generally not less than 1/4 of the short span (ie the shortest side length) of the prefabricated board body 1. Optionally, when the diameter of the connecting steel bar 4 placed in the groove 2 is larger than the designed diameter of the steel bar, the length of the groove 2 may be appropriately shortened. In FIG. 12 b , the prefabricated panel body 1 is rectangular, and the length of the straight steel bars 82 extending from the edge of the prefabricated panel body 1 inward is 1/4 of the short span of the prefabricated panel body 1 . The groove 2 extends in a direction perpendicular to the edge, the lower part of the groove 2 is placed with a connecting bar 4, and the upper part of the groove 2 is placed above the connecting bar 4 to place the support negative bending moment steel bar 5. In this embodiment, the length of the groove 2 can only be opened to the length of the overlap of the steel bars, and the length of the straight steel bars 82 is short, which saves the cost of the mold and reduces the difficulty of forming.

Optionally, see the schematic diagram of the prefabricated concrete slab without top reinforcement bars as shown in FIG. 12c. The upper part of the prefabricated panel body 1 is not provided with top reinforcement bars; the length of the groove 2 is less than the length of the edge of the prefabricated panel body parallel to it. Similarly, the length of the groove 2 of the prefabricated panel body 1 is generally not less than the short span of the prefabricated panel body 1. 1/4. Optionally, when the diameter of the connecting steel bar 4 placed in the groove 2 is larger than the designed diameter of the steel bar, the length of the groove 2 may be appropriately shortened. In Figure 12c, the prefabricated board body 1 is rectangular, the groove 2 extends in the direction perpendicular to the edge, the lower part of the groove 2 is placed with connecting reinforcement 4, and the upper part of the groove 2 is located above the connecting rib 4 to place the negative bending moment of the support Rebar 5. In this way, the length of the groove 2 needs to meet the requirements of the length of the support steel bar, so the length of the groove 2 is longer, but the amount of steel bar material is low.

Optionally, according to the needs of the construction process, the height of the poured concrete can also be lower than the height of the top surface of the prefabricated panel body 1 , and then the poured concrete surface and the top surface of the prefabricated panel body 1 are leveled by other processes.

Optionally, referring to Fig. 13a and Fig. 13b showing the schematic diagrams of the arrangement of the connecting steel bars in the grooves or the negative bending moment steel bars of the support in the connection structure of the precast concrete slab of the present disclosure, in the connection structure of the precast concrete slab and the slab support Among them, there may be at least two connecting bars in the groove 2, and the at least two connecting bars are arranged at intervals in the same horizontal plane. Fig. 13a shows the case where the groove width of the groove 2 is small, the groove width is 150mm-200mm, and a connecting steel bar is provided on both sides of the groove 2 respectively. Fig. 13b shows the case where the groove width of the groove 2 is relatively large, the groove width is 200mm-250mm, and a connecting steel bar is provided on both sides of the groove 2 respectively. Similarly, the groove 2 may also be provided with at least two support negative bending moment bars 5, and at least two support negative bending moment steel bars 5 are arranged at intervals in the same horizontal plane. 13a and 13b are plan views from top to bottom when the support negative bending moment steel bar 5 is provided, since the connecting steel bar is located directly below the support negative bending moment steel bar 5, it is blocked and not shown, The width of the groove 2 and the setting positions of the two support negative bending moment bars 5 are the same as the case of the two connecting bars.

The present disclosure also provides a connection structure between a precast concrete slab and a prefabricated concrete slab. Please refer to the three-dimensional schematic diagram of the connection structure shown in FIG. 6 and the longitudinal cross-sectional view of the connection structure shown in FIG. 7 . The connection structure includes at least two prefabricated concrete slabs, and the prefabricated concrete slabs adopt the prefabricated concrete slabs of the present disclosure, including a prefabricated slab body 1 and a slab bottom steel bar 3 . The prefabricated panel body 1 is formed by prefabrication of concrete, and the top surface of the prefabricated panel body 1 is the finished surface of the floor slab structure. The bottom reinforcement bars 3 are arranged at the lower part of the prefabricated panel body 1 and covered inside the prefabricated panel body 1 .

Among the two adjacent prefabricated concrete slabs, the edge of the prefabricated slab body 1 of the first prefabricated concrete slab and the edge of the prefabricated slab body 1 of the opposite second prefabricated concrete slab are provided with grooves 2, and the grooves 2 are formed from The edge where it is located extends to the inside of the edge where it is located. The positions of the grooves 2 on the first precast concrete plate correspond to the positions of the grooves 2 on the second precast concrete plate, that is, the extending directions of the pair of grooves 2 corresponding to the positions are on a straight line. A connecting bar 4 is placed in each groove 2, at least a part of the connecting bar 4 is located in the groove 2 on one side, and at least another part of the connecting bar 4 is located in the groove 2 on the other side. The setting of the connecting bar 4 can be in the following ways:

The first type is that two connecting bars 4 are placed in a pair of grooves 2 corresponding to the positions. The first connecting bars 4 are placed in the grooves 2 of the first concrete precast slab, and the other end extends into the second precast concrete slab. In the groove 2; the second connecting steel bar 4 is placed in the groove 2 of the second precast concrete board, and the other end extends into the groove 2 of the first precast concrete board.

In the second type, a connecting steel bar 4 is placed in a pair of grooves 2 corresponding to the position. One end of the connecting steel bar 4 is located in the groove 2 of the first concrete prefabricated plate, and the other end extends into the groove of the second prefabricated concrete plate. 2 inside.

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

The concrete prefabricated slab used in the connection structure is directly prefabricated according to the target thickness and shape of the floor slab. The top surface of the prefabricated slab body 1 is the finished surface of the floor slab structure, and there is no need to pour concrete on the top surface of the prefabricated slab body 1 at the construction site. Wet work on site is reduced, and there is no need to wait for the solidification time of the concrete after the precast concrete slab is set in place. The support device of the prefabricated wall and other components can be directly supported and fixed on the floor slab, which improves the construction efficiency. In addition, the prefabricated concrete slab has no mustache bars during construction, and the prefabricated concrete slab can be easily hoisted, assembled, and other operations, and the construction method is more flexible.

The present disclosure also provides a construction method for the connection structure between the concrete precast slab and the slab support 6, the construction method comprising:

Set the prefabricated concrete slab and the slab support 6 in place; the two prefabricated concrete slabs can be aligned along the extension direction of the top surface of the slab support 6 through the hoisting and supporting device, and fixed symmetrically on both sides of the slab support 6 .

Among them, the construction method of setting the concrete prefabricated slab in place can adopt the method of setting vertical support at the bottom of the slab. Eliminate the installation of vertical supports and improve construction efficiency. Referring to the schematic diagram of the concrete precast panel of the present disclosure using angle steel support in construction, the form of angle steel 31 is used to support the concrete precast panel, wherein the upper end face of the angle steel 31 supports the concrete precast panel, and the other end face of the angle steel 31 is used to support the concrete precast panel. It is fixedly connected to the plate support 6 by bolts, and the above-mentioned support method of the angle steel 31 can eliminate the steps of installing a large number of vertical supports, thereby reducing labor, improving efficiency and saving cost.

The connecting bars 4 are placed in the grooves 2 on both sides of the plate support 6, and at least a part of the connecting bars 4 extends to the area where the top surface of the plate support 6 is located; the connecting bars 4 can adopt the two aforementioned settings method, which will not be repeated here; and

Concrete is poured at least in the groove 2 and at the top surface of the plate support 6, so that the plate support 6 and the two precast concrete slabs are connected through the connecting steel bar 4 and the poured concrete. During pouring, the required auxiliary formwork can be set in the connection structure to limit the concrete to the required range.

The height of the poured concrete can be equal to the height of the top surface of the prefabricated panel body 1 , which allows the connecting reinforcement bars 4 to be covered by the cast-in-place concrete, so that the top surface of the entire connecting structure forms the floor structure completion surface. If beam stirrups 7 are provided, the beam stirrups 7 are also covered by the cast-in-place concrete.

Optionally, the height of the concrete poured on site can also be made lower than the height of the top surface of the prefabricated panel body 1. Corresponding treatment can be done according to the needs of the project, and then the top surface of the entire connection structure can be formed into a floor structure completion surface through other processes. .

In the description of this specification, references to the terms "one embodiment/mode", "some embodiments/modes", "example", "specific example", or "some examples", etc. are intended to be combined with the description of the embodiment/mode A particular feature, structure, material, or characteristic described by way of example or example is included in at least one embodiment/mode or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to 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/means or examples. Furthermore, those skilled in the art may combine and combine the different embodiments/modes or examples described in this specification and the features of the different embodiments/modes or examples without conflicting each other.

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

Those skilled in the art should understand that the above-mentioned embodiments are only for clearly illustrating the present disclosure, rather than limiting the scope of the present disclosure. For those skilled in the art, other changes or modifications may also be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims (21)

1. a concrete prefabricated slab, is characterized in that, comprises: a prefabricated panel body, which is formed by prefabrication of concrete, and the top surface of the prefabricated panel body is the finished surface of the floor slab structure; and plate bottom reinforcement, arranged at the lower part of the prefabricated plate body and covered inside the prefabricated plate body; Wherein, at least part of the edge of the prefabricated board body is provided with a groove for placing the connecting steel bars, and the groove extends from the edge to the inner side of the edge. 2 . The concrete precast panel according to claim 1 , wherein the precast panel body is rectangular. 3 . 3. The prefabricated concrete slab according to claim 2, wherein the reinforcing bars at the bottom of the slab are steel meshes. 4 . The precast concrete panel according to claim 3 , wherein the upper part of the precast panel body is provided with top reinforcement bars, and the top reinforcement bars are covered inside the precast panel body. 5 . 5 . The prefabricated concrete slab according to claim 4 , wherein the reinforcing bars on the top of the slab are steel meshes. 6 . 6 . The precast concrete panel according to claim 2 , wherein the grooves are evenly spaced at the edge of the precast panel body. 7 . 7. The precast concrete panel according to any one of claims 1 to 6, wherein the cross section of the groove is rectangular, trapezoidal, V-shaped or door-shaped. 8. The prefabricated concrete panel according to any one of claims 1 or 3 to 6, wherein pipelines are embedded in the prefabricated panel body, and the prefabricated panel body is rectangular; The four corners of the prefabricated board body are provided with enlarged grooves, and the pipeline protrudes into the enlarged grooves at the four corners of the prefabricated board body for connection; The side surface of the prefabricated board body protrudes for connection. 9. The precast concrete panel according to any one of claims 1 to 6, wherein the inner wall of the groove is set as an uneven surface. 10 . The precast concrete panel according to claim 9 , wherein the inner wall of the groove is provided with a corrugated groove to form the uneven surface. 11 . 11. The precast concrete panel according to any one of claims 1 to 6, characterized in that, in a direction extending from the edge where the groove is located to the inner side of the edge where the groove is located, the width of the groove is the same or different. The width of the groove is increased to form a shape with a narrow outer and inner wide shape. 12. The precast concrete panel according to any one of claims 1 to 6, characterized in that, in a direction extending from the edge where the groove is located to the inner side of the edge where the groove is located, the depth of the groove is the same or different. The depth of the groove becomes smaller. 13. The precast concrete panel according to claim 12, wherein the bottom surface of the groove comprises an inclined surface and/or a stepped surface. 14. A connection structure between a precast concrete slab and a slab support, comprising: plate supports; and A precast concrete slab, comprising a prefabricated slab body and a slab bottom steel bar; the prefabricated slab body is formed by prefabrication of concrete, and the top surface of the prefabricated slab body is a floor structure completion surface; the slab bottom reinforcing bar is arranged on the prefabricated slab body The lower part of the prefabricated panel body is covered; Wherein, the two prefabricated concrete slabs are symmetrically arranged on both sides of the slab support, and the edges of the prefabricated slab body of each of the prefabricated concrete slabs adjacent to the top surface of the slab support are provided with grooves, the grooves extend from the edge to the inner side of the edge, each of the grooves is placed with a connecting steel bar, and at least a part of the connecting steel bar protrudes to the top surface of the plate support the area in which it is located; 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 slabs are connected by the connecting steel bars and the poured concrete. 15. The structure according to claim 14, wherein the positions of the grooves on the precast board bodies of the two precast concrete panels correspond to each other, and each pair of the grooves corresponding to the positions has a There is a support negative bending moment steel bar, one end of the support negative bending moment steel bar is located in the groove on one side, and the other end of the support negative bending moment steel bar crosses the plate support and is located in the groove. In the groove on the other side, the negative bending moment reinforcement of the support is located above the connecting reinforcement, and the height of the negative bending moment reinforcement of the support is lower than the height of the top surface of the prefabricated panel body. 16. The structure according to claim 15, wherein the upper part of the prefabricated panel body is provided with a reinforcing mesh, the reinforcing mesh is covered inside the prefabricated panel body and extends from a side of the prefabricated panel body. The edge extends to the opposite edge. 17. The structure according to claim 15, wherein the upper part of the prefabricated panel body is provided with straight steel bars arranged in parallel and spaced apart; the interior of the prefabricated panel body, and the length of the straight steel bar is less than the length of the edge of the prefabricated panel body parallel to it. 18. The structure of claim 15, wherein the upper part of the prefabricated panel body is not provided with top reinforcement bars; the length of the groove is less than the length of the edge of the prefabricated panel body parallel to it. 19. The structure according to 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 prefabricated panel body. 20. The structure according to any one of claims 15 to 18, wherein at least two connecting reinforcing bars are arranged in the groove, and at least two connecting reinforcing bars are arranged at intervals in the same horizontal plane; or At least two negative bending moment bars of the support are arranged in the groove, and at least two negative bending moment bars of the support are arranged at intervals in the same horizontal plane. 21. A connection structure between a prefabricated concrete slab and a prefabricated concrete slab, characterized in that it comprises at least two prefabricated concrete slabs, the prefabricated concrete slabs comprise a prefabricated slab body and a steel bar at the bottom of the slab; the prefabricated slab body is formed from prefabricated concrete , and the top surface of the prefabricated board body is the floor structure completion surface; the bottom reinforcement bars are arranged at the lower part of the prefabricated board body and are covered inside the prefabricated board body; Wherein, the opposite edges of the precast board bodies of the two adjacent precast concrete boards are provided with grooves, and the grooves extend from the edge to the inner side of the edge; Connecting steel bars are placed in all of them, at least a part of the connecting steel bars is located in the groove on one side, and at least another part of the connecting steel bars is located in the groove on the other side; The concrete is poured in at least the groove, and the two adjacent precast concrete slabs are connected by the connecting steel bar and the poured concrete.

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