Support-free cast-in-place-free vacancy-filling-free precast concrete laminated slab

Abstract

The utility model discloses a support-free cast-in-place-free vacancy-patching-free precast concrete laminated slab which comprises a lower precast part and a laminated part formed by post-pouring on the precast part, the precast part comprises a bottom plate formed by pouring, and a first-stage strengthening step arranged in the longitudinal direction in a full-length mode is integrally formed in the middle of the bottom plate in a pouring mode. The thickness of the first-stage reinforced step is smaller than the overall thickness of the laminated slab; a plurality of tie reserved grooves are formed in the top surface of the first-stage reinforcing step, and tie steel bars are fixedly arranged in the tie reserved grooves respectively; the overlapping part comprises overlapping steel bars higher than the first-stage strengthening step, the tie steel bars are connected with the overlapping steel bars, and a concrete overlapping layer higher than the overlapping steel bars is formed above the bottom plate in a pouring mode. The floor plate is high in bearing capacity, temporary supports in site construction are reduced, empty-filling formworks and scaffold supports at the abutted seams are reduced, site construction is simple, the floor plate is easy to manufacture and machine, and the overall cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled buildings, in particular to a support-free and cast-in-situ precast concrete composite slab with void filling. Background Art

[0002] Composite slabs are assembled integral slabs made of prefabricated floor panels and cast-in-place reinforced concrete layers, and are an important component of prefabricated buildings. Currently, the prefabricated floor panels in composite slabs are mainly reinforced truss concrete slabs. During their production, the steel trusses are first welded and processed, and then the floor panel steel mesh is laid out on the relevant mold. Several steel trusses arranged at a certain distance are fixed on the steel mesh, and then concrete is poured at the bottom of the steel mesh and the steel trusses to form the bottom plate. The production is relatively complicated and the cost is relatively high. During on-site construction, the longitudinal ends of the prefabricated floor panels are respectively placed on the corresponding beams and spliced horizontally. However, because the bottom plate in the floor panel is thin and the height and rigidity of the steel trusses are small, the overall rigidity of the floor panel is small, and a large mid-span deflection will still occur during construction, so it is still necessary to add a certain amount of temporary support at the bottom of the floor panel. In addition, the horizontal joints of the floor panels usually have a joint of 300 to 500 mm. The bottom steel bars extending laterally at the joints are bonded to the composite layer after the concrete is poured in place. For this reason, the joints also need to be equipped with gap-filling formwork and scaffolding supports, which makes the construction of the existing composite panels more complicated and the construction cost remains high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a precast concrete composite slab which has high bearing capacity of floor panels, reduces temporary supports for on-site construction, is conducive to reducing gap-filling templates and scaffolding supports at joints, is simple in on-site construction, is simple in floor panel production and processing, and has reduced overall cost and is support-free and cast-in-situ.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a support-free and cast-in-place-free precast concrete composite slab with gap filling, comprising a precast part at the bottom and a composite part cast on the precast part, the precast part comprising a cast base plate, the middle part of the base plate is integrally cast with a first-level reinforcement step arranged along the entire length in the longitudinal direction, the thickness of the first-level reinforcement step is less than the overall thickness of the composite slab; a plurality of tie-reserved grooves are provided at the top surface of the first-level reinforcement step, and a tie steel bar is fixed in each of the tie-reserved grooves; the composite part comprises composite steel bars arranged higher than the first-level reinforcement step, the tie steel bars are connected to the composite steel bars, and a concrete composite layer higher than the composite steel bars is cast above the base plate.

[0005] As a preferred technical solution, the thickness of the bottom plate is 35 to 50 mm.

[0006] As a preferred technical solution, the thickness of the first-level strengthening step is 30 to 50 mm smaller than the overall thickness of the composite plate.

[0007] As a preferred technical solution, bottom steel bars are pre-embedded in the bottom plate, first-level step steel bars are pre-embedded in the first-level reinforcement step, and the first-level step steel bars are connected to the bottom steel bars.

[0008] As a preferred technical solution, the bottom reinforcement includes cross-arranged bottom longitudinal reinforcement and bottom transverse reinforcement, both ends of the bottom longitudinal reinforcement extend out of the bottom plate; and both ends of the bottom transverse reinforcement do not extend out of the bottom plate.

[0009] As a preferred technical solution, both ends of the bottom transverse reinforcement are provided with joint anchoring sections extending upward from the top surface of the bottom plate.

[0010] As a preferred technical solution, a splicing steel bar is provided above the joint between the bottom plate and the adjacent bottom plate, and the splicing steel bar is connected to the superimposed steel bar.

[0011] As a preferred technical solution, a secondary strengthening step is integrally cast in the middle of the primary strengthening step, and the thickness of the secondary strengthening step is equal to the overall thickness of the composite plate.

[0012] Due to the adoption of the above technical solution, a precast concrete composite slab with no support and no cast-in-place filling is provided, comprising a precast portion at the bottom and a composite portion cast on the precast portion. The precast portion comprises a cast-formed bottom plate, the middle portion of which is integrally cast with a first-level reinforcement step arranged along the entire length in the longitudinal direction, the thickness of the first-level reinforcement step being less than the overall thickness of the composite slab; a plurality of tie pre-reserved grooves are provided on the top surface of the first-level reinforcement step, each of which is fixed with a tie steel bar; the composite portion comprises composite steel bars arranged above the first-level reinforcement step, the tie steel bars being connected to the composite steel bars, and a concrete composite layer higher than the composite steel bars is cast on the top of the bottom plate. The precast portion of the utility model directly forms the first-level reinforcement step arranged along the entire length in the longitudinal direction on the bottom plate, which significantly improves the bearing capacity, and the remaining bottom plate portion can also form good bending resistance, thereby significantly reducing the mid-span deflection, reducing temporary support for on-site construction, and facilitating the reduction of gap filling formwork and scaffolding support at the joints, making on-site construction simple. The prefabricated portion only requires reinforcement and then cast into shape, simplifying the production and processing of the floor slab and reducing overall costs. During on-site construction, the tie-reinforced grooves enhance the interlocking contact with the concrete overlay. The connection between the tie-reinforced steel bars and the overlaying steel bars enhances the overall bonding strength between the prefabricated portion and the overlaying portion, further simplifying construction and reducing overall costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0014] Figure 1 This is a schematic diagram of the top view of the prefabricated part of the first embodiment of the present utility model;

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of the AA structure;

[0016] Figure 3 yes Figure 1 A magnified schematic diagram of the BB structure;

[0017] Figure 4 This is a schematic diagram of the top view of the structure of the first embodiment of the utility model during on-site construction;

[0018] Figure 5 yes Figure 4 A magnified schematic diagram of the CC structure;

[0019] Figure 6 yes Figure 4 A magnified schematic diagram of the DD structure;

[0020] Figure 7 yes Figure 4 Schematic diagram of EE structure;

[0021] Figure 8 yes Figure 4 Schematic diagram of FF structure;

[0022] Figure 9 This is a schematic structural diagram of a first embodiment of the present invention in which the tie-reserved groove only uses a circular cross section;

[0023] Figure 10 This is a schematic diagram of the cross-sectional structure of the prefabricated part of the second embodiment of the present utility model;

[0024] Figure 11 This is a schematic diagram of the top view of the prefabricated part of the third embodiment of the present utility model;

[0025] Figure 12 yes Figure 11 A magnified schematic diagram of the GG structure;

[0026] Figure 13 yes Figure 11 A magnified schematic diagram of the HH structure;

[0027] Figure 14 This is a schematic diagram of the top view of the structure of the third embodiment of the present invention during on-site construction;

[0028] Figure 15 yes Figure 14A magnified schematic diagram of the JJ structure;

[0029] Figure 16 yes Figure 14 A magnified schematic diagram of the KK structure;

[0030] Figure 17 yes Figure 14 A magnified schematic diagram of the LL structure;

[0031] Figure 18 This is a schematic diagram of the top view of the structure when the secondary reinforcement step in the prefabricated part of the third embodiment of the present invention is in the shape of a long strip;

[0032] Figure 19 yes Figure 18 A magnified schematic diagram of the NN structure;

[0033] Figure 20 yes Figure 18 Schematic diagram of the enlarged RR structure.

[0034] In the figure: 1-precast part; 11-bottom plate; 12-first-level reinforcement step; 13-reserved groove for tie; 14-tie reinforcement; 15-second-level reinforcement step; 2-overlapping part; 21-concrete overlap layer; 3-bottom reinforcement; 31-bottom longitudinal reinforcement; 32-bottom transverse reinforcement; 33-joint anchorage section; 4-first-level step reinforcement; 41-first-level longitudinal reinforcement; 42-first-level transverse reinforcement; 5-overlapping reinforcement; 51-overlapping longitudinal reinforcement; 52-overlapping transverse reinforcement; 6-spliced reinforcement; 61-spliced longitudinal reinforcement; 62-spliced transverse reinforcement; 7-second-level step reinforcement; 71-second-level longitudinal reinforcement; 72-second-level transverse reinforcement; 9-beam body. DETAILED DESCRIPTION

[0035] The present invention is further described below with reference to the accompanying drawings and examples. In the detailed description that follows, certain exemplary embodiments of the present invention are described by way of illustration only. It goes without saying that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0036] Example 1: Figures 1 to 9 As shown together, a support-free and cast-in-situ precast concrete composite slab with gap filling includes a lower precast part 1 and a composite part 2 cast on the precast part 1. The thickness of the precast part 1 and the composite part 2 after overlapping forms the overall thickness of the composite slab.

[0037] The prefabricated part 1 comprises a cast bottom plate 11. Figure 2 and Figure 3As shown, the bottom plate 11 is pre-buried with bottom reinforcement 3; conventionally, the bottom reinforcement 3 includes a bottom longitudinal reinforcement 31 and a bottom transverse reinforcement 32 arranged crosswise, and both ends of the bottom longitudinal reinforcement 31 extend out of the bottom plate 11. Figure 4 、 Figure 7 and Figure 8 As shown, after the ends of the prefabricated portion 1 are resting on the beam body 9, the ends of the bottom longitudinal reinforcement 31 are used to form a connection with the post-cast concrete. The ends of the bottom transverse reinforcement 32 are not arranged to extend from the bottom plate 11. This simplifies the mold structure and manufacturing process during prefabrication and facilitates seamless splicing between adjacent bottom plates 11, reducing the need for filler formwork and scaffolding support at the joints during construction.

[0038] The bottom longitudinal reinforcement 31 is preferably prestressed to improve the bearing capacity of the prefabricated part 1. Of course, the bottom longitudinal reinforcement 31 can be made of steel strands, which has the same effect, that is, the bottom reinforcement 3 includes cross-arranged bottom longitudinal steel strands and bottom transverse reinforcement 32, and this method should also be within the scope of protection of the present utility model.

[0039] like Figure 1 and Figure 4 As shown, the middle part of the bottom plate 11 is integrally cast with a first-level strengthening step 12 arranged along the entire length in the longitudinal direction. When the prefabricated part 1 is placed on the beam 9, both ends of the first-level strengthening step 12 also rest on the beam 9, forming a high-strength self-supporting capacity for the prefabricated part 1 as a whole. The remaining bottom plate 11 parts on both sides also form better bending resistance. Based on this, the remaining bottom plate 11 parts can adopt a smaller thickness. Preferably, the thickness of the bottom plate 11 is 35 to 50 mm. The first-level strengthening step 12 can be adopted as follows Figure 9 The longitudinal full-length strip shown in the figure can also be arranged as Figure 1 The H-shape shown is not limiting.

[0040] Preferably, if Figure 2 and Figure 3 As shown, the first-level reinforcement step 12 is pre-embedded with a first-level step reinforcement 4, which is connected to the bottom reinforcement 3. Therefore, in the production of the prefabricated part 1, the first-level step reinforcement 4 and the bottom reinforcement 3 are pre-connected to form an integral reinforcement frame, and then the entire frame is cast and formed, which simplifies the production and processing. The first-level step reinforcement 4 is also in the form of a cross-arrangement of longitudinal and transverse reinforcements, that is, the first-level step reinforcement 4 includes a cross-arranged first-level longitudinal reinforcement 41 and a first-level transverse reinforcement 42. Preferably, the ends of the first-level longitudinal reinforcement 41 and the first-level transverse reinforcement 42 are bent downward to form a connection with the bottom reinforcement 3.

[0041] like Figures 5 to 7As shown, the thickness of the first-level reinforcement step 12 is less than the overall thickness of the composite slab, so that the reinforcement of the subsequent composite part 2 can be easily tied above the first-level reinforcement step 12. Preferably, the thickness of the first-level reinforcement step 12 is 30-50 mm less than the overall thickness of the composite slab. In this way, while achieving a larger thickness and stronger bending resistance, it ensures the subsequent laying of the upper composite reinforcement 5 and ensures the connection between the prefabricated part 1 and the composite part 2.

[0042] like Figures 1 to 9 As shown, a plurality of tie-reserved grooves 13 are provided on the top surface of the first-level reinforcement step 12, and a tie-reserved steel bar 14 is fixed in each of the tie-reserved grooves 13. The tie-reserved steel bars 14 can be fixed in the tie-reserved grooves 13 by pre-embedding or by later anchoring, and there is no limitation here. By providing the tie-reserved grooves 13, the tie-reserved capacity of the prefabricated part 1 and the post-cast overlapping part 2 can be improved with little impact on the bearing capacity of the first-level reinforcement step 12. Preferably, the bottom of the tie-reserved grooves 13 is coplanar with the top surface of the base plate 11, so that the ideal tie-reserved performance at the tie-reserved grooves 13 can be achieved at a larger depth without affecting the structure of the base plate 11.

[0043] Among them, when the first-level strengthening step 12 of this embodiment is set as follows Figures 1 to 8 When the H-shape is shown, the larger rectangular grooves at both ends also form a tie effect equivalent to the tie reserved groove 13, and because it has a larger tie contact area with the post-cast overlapping part 2, the tie effect is more prominent; of course, as Figure 6 As shown, tie bars 14 may also be added to the rectangular groove to further enhance the tie performance.

[0044] like Figures 4 to 8 As shown, the composite portion 2 includes composite reinforcement bars 5 positioned above the first reinforcement step 12. A concrete laminate layer 21 is cast above the base plate 11, extending above the composite reinforcement bars 5. The composite reinforcement bars 5 are also arranged in a crosswise arrangement of longitudinal and transverse reinforcement bars, namely, they include crosswise laminated longitudinal reinforcement bars 51 and laminated transverse reinforcement bars 52. Tie bars 14 are connected to the composite reinforcement bars 5. This steel connection further enhances the bond strength between the prefabricated portion 1 and the composite portion 2.

[0045] Preferably, if Figure 5 and Figure 6As shown, a splicing steel bar 6 is provided above the joint between the base plate 11 and the adjacent base plate 11. The splicing steel bar 6 is connected to the composite steel bar 5. The splicing steel bar 6 allows the post-cast concrete composite layer 21 to form a better bond with the base plate 11, ensuring that both forces are applied and that the joint does not crack. The splicing steel bar 6 is also arranged in a longitudinal and transverse steel bar arrangement, that is, the splicing steel bar 6 includes a cross-arranged splicing longitudinal steel bar 61 and splicing transverse steel bar 62. The ends of the splicing transverse steel bar 62 are bent upward to form a connection with the composite steel bar 5.

[0046] The prefabricated part 1 described in this embodiment can be integrally cast after the bottom steel bars 3 and the first-level step steel bars 4 are used to build a steel frame. There is no need for complex truss welding, and the manufacturing process is simple and the cost is low. During construction, the two ends of the prefabricated part 1 are placed on the beam body 9. The first-level reinforced step 12 arranged along the entire longitudinal length uses its larger thickness to provide stronger bending resistance, significantly improving the overall bearing capacity. The remaining bottom plate 11 can also form better bending resistance, thereby significantly reducing the mid-span deflection and reducing temporary support for on-site construction. The bottom steel bars 3 at the joints do not extend out, forming a seamless joint. In addition, relying on the high bending resistance formed by the first-level reinforced step 12, the joints do not need to be filled with blank templates and scaffolding support to carry out post-cast concrete operations. The on-site construction is simple and the overall cost is reduced. After constructing the joint steel bars 6 at the joint and constructing the superimposed steel bars 5 above the first-level step steel bars 4, concrete is poured to form the concrete superimposed layer 21; the provision of the tie reserved groove 13 on the first-level reinforced step 12 can increase the interlocking contact area between the prefabricated part 1 and the superimposed part 2, and through the connection between the tie steel bars 14 and the superimposed steel bars 5, the overall bonding strength between the prefabricated part 1 and the superimposed part 2 is high, and the joint position is also better bonded by utilizing the joint steel bars 6, the joint does not crack, the on-site construction is further simplified, and the overall construction cost is reduced.

[0047] Example 2: Figure 10 As shown, the difference between this embodiment and the first embodiment is that: at both ends of the bottom transverse reinforcement 32, there are provided with joint anchoring sections 33 extending upward from the top surface of the bottom plate 11, and the joint anchoring sections 33 are used to connect with the splicing reinforcement 6, so as to further improve the adhesion between the bottom plate 11 and the concrete composite layer 21 at the joint without affecting the seamless splicing, and further ensure that the joint does not crack.

[0048] Example 3: Figures 11 to 20As shown in the figure, this embodiment differs from the first embodiment in that a secondary reinforcing step 15 is integrally cast in the middle portion of the primary reinforcing step 12. The thickness of the secondary reinforcing step 15 is equal to the overall thickness of the composite slab. The provision of the secondary reinforcing step 15 further improves the overall bending resistance of the prefabricated portion 1 and enhances its load-bearing capacity. Of course, the secondary reinforcing step 15 no longer requires the subsequent installation of the composite reinforcement 5 or the subsequent pouring of the composite concrete layer 21.

[0049] Wherein, the secondary strengthening step 15 can be as follows Figure 11 The H shape shown can also be Figure 18 The long strip shown is not limited here. Figures 11 to 17 In the figure, the structure and on-site construction principle of the H-shaped secondary reinforcement step 15 are shown. Figures 18 to 20 The structure of the secondary strengthening step 15 when it is a long strip is schematically shown in FIG.

[0050] like Figure 12 、 Figure 13 as well as Figure 19 As shown, a secondary step reinforcement bar 7 is pre-embedded in the secondary reinforcement step 15, and the secondary step reinforcement bar 7 is connected to the primary step reinforcement bar 4 and the bottom reinforcement bar 3. The secondary step reinforcement bar 7 is also arranged in a form of a cross-arrangement of longitudinal and transverse reinforcements, that is, the secondary step reinforcement bar 7 includes a cross-arranged secondary longitudinal reinforcement bar 71 and a secondary transverse reinforcement bar 72. The ends of the secondary longitudinal reinforcement bar 71 and the secondary transverse reinforcement bar 72 are bent downward to form a connection with the primary step reinforcement bar 4 and the bottom reinforcement bar 3.

[0051] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A precast concrete composite slab without support and cast-in-situ filling, comprising a precast lower portion and a composite portion cast on the precast portion, characterized in that: The prefabricated part includes a cast base plate, and a first-level reinforcement step is integrally cast in the middle of the base plate and arranged along the entire length in the longitudinal direction. The thickness of the first-level reinforcement step is less than the overall thickness of the composite plate; a plurality of tie-reserved grooves are provided on the top surface of the first-level reinforcement step, and a tie steel bar is fixed in each of the tie-reserved grooves; the composite part includes composite steel bars arranged higher than the first-level reinforcement step, and the tie steel bars are connected to the composite steel bars, and a concrete composite layer higher than the composite steel bars is cast above the base plate.

2. The support-free and cast-in-situ precast concrete composite slab according to claim 1, characterized in that: The thickness of the bottom plate is 35-50 mm.

3. The support-free and cast-in-situ precast concrete composite slab according to claim 1, characterized in that: The thickness of the first-level strengthening step is 30 to 50 mm smaller than the overall thickness of the composite plate.

4. The support-free and cast-in-situ precast concrete composite slab according to claim 1, characterized in that: Bottom steel bars are pre-embedded in the bottom plate, first-level step steel bars are pre-embedded in the first-level reinforcement step, and the first-level step steel bars are connected to the bottom steel bars.

5. The support-free and cast-in-situ precast concrete composite slab according to claim 4, characterized in that: The bottom reinforcement includes cross-arranged bottom longitudinal reinforcement and bottom transverse reinforcement, both ends of the bottom longitudinal reinforcement extend out of the bottom plate; and both ends of the bottom transverse reinforcement do not extend out of the bottom plate.

6. The support-free and cast-in-situ precast concrete composite slab according to claim 5, characterized in that: Both ends of the bottom transverse reinforcement are provided with joint anchoring sections extending upward from the top surface of the bottom plate.

7. The support-free and cast-in-situ precast concrete composite slab according to claim 1, characterized in that: A splicing steel bar is provided above the splicing point between the bottom plate and the adjacent bottom plate, and the splicing steel bar is connected to the superimposed steel bar.

8. The support-free and cast-in-situ precast concrete composite slab according to claim 1, characterized in that: A secondary strengthening step is integrally cast in the middle of the primary strengthening step, and the thickness of the secondary strengthening step is equal to the overall thickness of the composite plate.

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