Hollow floor with prefabricated floor panels

Abstract

The application provides a hollow floor system of prefabricated floor slab, comprising a floor slab and a top slab, the floor slab is formed by splicing prefabricated floor slab units and casting the splicing joints, the top slab is cast on the floor slab; the prefabricated floor slab units are formed by integrally casting adjacent base units arranged in an array; the adjacent base units form stirrup grooves for installing stirrups; the central area of the four base units arranged in a square array is formed by concrete, which constitutes the connecting seats of the four base units, the top of the connecting seat is provided with a stirrup mechanical connecting device; the mechanical connecting stirrups of the connecting seat and the integral stirrups connected with the floor slab steel bars in the stirrup grooves constitute all the stirrups of the longitudinal and transverse concrete rib beams of the hollow floor system, realizing the integral connection of the prefabricated floor slab of the hollow floor system and the cast-in-place rib beams and the top slab; through the structural design of separating the stirrups from the prefabricated floor slab units, the risk of damaging the vertical reserved stirrups of the prefabricated floor slab is avoided, and the safety of stacking the prefabricated floor slab units and the transportation efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a hollow floor slab with a precast base plate. Background Technology

[0002] Due to its advantages in sound insulation, heat insulation, saving structural space, and reducing overall construction costs, hollow core slabs have been widely used in large-span building structures such as industrial plants, stadiums, underground parking garages, and school buildings. However, in existing technologies, the concrete in the base slab must flow to the bottom through the gaps between the inner molds and cannot be directly vibrated. This often results in quality defects such as the floating and lateral displacement of the inner mold filling, poor quality of the base slab concrete pouring, and uncontrolled thickness of the base slab reinforcement protective layer. These defects not only affect the structural load-bearing capacity and safety but also impair the structural durability.

[0003] At the same time, without knowing the design load and span of the hollow floor slab for a specific project, the thickness of the hollow floor slab structure cannot be determined. Therefore, the diameter, specifications, strength grade and reserved length of the stirrups cannot be determined, which is not conducive to the production and manufacturing of prefabricated components.

[0004] If the thickness of the hollow floor slab structure cannot be determined, the reserved length of the stirrups needs to be determined according to the tension lap joint. In this case, the reserved stirrup portion is not conducive to the stacking and transportation of prefabricated components. Summary of the Invention

[0005] In view of this, the present invention provides a hollow floor slab with a precast base slab, which can avoid the problems of floating and lateral movement of the hollow inner mold, and also takes into account the design freedom. It can produce the main precast slabs in advance, and the length, specifications and other parameters of the stirrups can be flexibly set and installed according to actual needs. The precast slabs and stirrups are designed separately, which improves the efficiency of stacking and transporting precast components. It includes a base slab and a top slab. The base slab is formed by splicing precast base slab units and casting in place. The top slab is cast in place on the base slab.

[0006] The precast base plate unit is formed by an array of cast-in-place foundation units; a stirrup groove is formed between adjacent foundation units for arranging integral stirrups.

[0007] Furthermore, the middle of the basic unit is sunken into a trough shape, and the sides protrude upward to form the bottom of the rib beam of the hollow floor slab. The stirrup groove is cast integrally with the bottom of the rib beam.

[0008] Furthermore, the four corresponding corners of adjacent basic units are cast together as one unit through connecting seats.

[0009] Furthermore, the connecting seat connects four stirrup grooves on a plane, and the top surface of the connecting seat is pre-embedded with a stirrup mechanical connection device, which is used to connect the mechanical connection stirrups provided on the upper part.

[0010] Furthermore, a U-shaped groove is formed above the stirrup groove; at least one end of the stirrup groove is connected to the connecting seat, the side of the stirrup groove is integrally cast with the bottom of the rib beam, and the bottom edge of the stirrup groove faces the ground.

[0011] Furthermore, the precast base plate unit is provided with a single layer of bidirectional base plate reinforcement bars. The base plate reinforcement bars intersect and pass through the cavity of the base plate and stirrup groove of the foundation unit, and the base plate reinforcement bars extend to the edge of the precast base plate unit and outward reinforcement bars. The top plate reinforcement bars are pre-embedded in the top plate.

[0012] Furthermore, secondary beams are formed between adjacent precast base plate units by cast-in-place concrete, and the outermost precast base plate unit is fixed to the outer frame beam by the edge reinforcement bars.

[0013] Furthermore, it also includes integral stirrups, which are disposed in the stirrup groove, with the lower end of the integral stirrup hooked to the exposed bottom slab reinforcement in the stirrup groove, and the upper end of the integral stirrup hooked to the top slab reinforcement.

[0014] Furthermore, the mechanical connection stirrup includes a lower stirrup section and an upper stirrup section. The lower end of the lower stirrup section overlaps the bottom slab reinforcement of the precast bottom slab unit, and the upper end is connected to the stirrup mechanical connection device. The lower end of the upper stirrup section is connected to the stirrup mechanical connection device, and the upper end is hooked to the top slab reinforcement.

[0015] Construction methods for precast hollow floor slabs are also provided, including:

[0016] S1. Select multiple precast base plate units according to the construction plan, taking into account the width requirements of the cast-in-place secondary beams between each precast base plate unit and the edge distance requirements with the frame beam, so that multiple precast base plate units can cover the construction area.

[0017] S2. Perform edge support construction, set up vertical supports at the middle position corresponding to the secondary beam, and set up horizontal supports along the four sides of the precast base plate unit to bear the self-weight and construction live load; lay the precast base plate unit;

[0018] S3. Install the beam reinforcement required for the secondary beam casting, and install the hollow inner formwork in the installation area of ​​the foundation unit, and set the top slab reinforcement;

[0019] S4. Install integral stirrups in the stirrup groove, hook the lower end of the integral stirrups to the exposed bottom plate reinforcement in the stirrup groove, and hook the upper end of the stirrups to the top plate reinforcement;

[0020] S5. Install mechanical connection stirrups on the connecting seat using the pre-embedded stirrup mechanical connection device; connect the lower end of the upper section of the stirrup to the stirrup mechanical connection device, and hook the upper end to the top plate reinforcement;

[0021] S6. Cast-in-place concrete to form a hollow floor slab consisting of a base slab, ribs, and a top slab.

[0022] The beneficial effects of this invention are as follows: the structural design that separates the stirrups from the precast base plate unit avoids the risk of damage to the stirrups reserved in the vertical direction of the precast base plate, and improves the safety and transportation efficiency of the precast base plate unit stacking; at the same time, the precast base plate unit composed of the foundation unit is highly flexible, and designers can easily adopt corresponding design schemes according to actual construction needs, and the precast production efficiency is high; it avoids the risk of hollow inner mold floating or shifting in the prior art, and improves the casting quality of the cast-in-place parts. Attached Figure Description

[0023] The present invention will now be described in more detail with reference to embodiments and figures:

[0024] Figure 1 This is a structural schematic diagram of a 3*3 precast base slab unit (without a poured top slab).

[0025] Figure 2 yes Figure 1 A cross-sectional view of section aa, i.e., a structural schematic diagram including the connecting seat;

[0026] Figure 3 yes Figure 1 A cross-sectional view of BB, i.e., a structural schematic diagram including the stirrup groove;

[0027] Figure 4 This is a schematic diagram of the installation of stirrups in the stirrup groove;

[0028] Figure 5 This is a schematic diagram of the installation of the stirrup mechanical connection device;

[0029] Figure 6 It is a top view of the hollow floor slab before it is poured.

[0030] Figure 7 yes Figure 6 The cc section diagram, which is the anchorage diagram of the precast bottom slab reinforcement in the secondary beam;

[0031] Among them, 1-precast base slab unit, 101-foundation unit, 1012-base slab, 102-stirrup groove, 103-connector seat, 1031-stirrup mechanical connection device, 104-base slab reinforcement, integral stirrup-105A, mechanical connection stirrup-105B, lower section of stirrup-105B1, upper section of stirrup-105B2, top slab reinforcement-106, 2-frame beam, 3-secondary beam, 301-beam reinforcement, 4-rib beam. Detailed Implementation

[0032] This invention provides a hollow floor slab with a precast base plate, which can avoid the problems of floating and lateral movement of the hollow inner mold, and also takes into account the design freedom. The main plates can be produced in the factory in advance, and the length, specifications and other parameters of the stirrups can be flexibly set and installed according to actual needs. The precast plates and stirrups are designed separately, which improves the efficiency of stacking and transportation of precast components. It includes multiple arrayed precast base plate units 1. Each precast base plate unit 1 includes a connecting seat 103, a stirrup groove 102 and a base unit 101. The base units 101 are arrayed and form the precast base plate unit 1 as a whole. The stirrup groove 102 is set between the base units 101 for transition. The connecting seat 103 is set at the node in the array of base units.

[0033] The precast base plate unit 1 is cast as a whole and precast, evolving from the foundation unit 101. The precast base plate unit is manufactured in the factory in advance using steel molds to ensure its dimensional accuracy. The dimensional stability of the precast base plate unit produced by steel molds is much greater than that of cast-in-place concrete, which can take into account design flexibility, transportation convenience and construction and installation efficiency.

[0034] In this embodiment, the base unit 101 is square, with a recessed center forming a bottom plate 1012. The hollow inner mold is installed and fixed in the recessed part of the base unit. When the top plate concrete is poured, the flowing concrete will not flow into the bottom of the hollow inner mold, thus avoiding the problem of the hollow inner mold floating and displacing at the source.

[0035] In this embodiment, a connecting seat 103 is set at the middle node of every four basic units 101 arranged in a square array. If nine basic units are arranged in a square array, four connecting seats 103 are set. If the stirrup groove is projected onto the plane, the connecting seat 103 is located at the node of the cross intersection formed by the stirrup groove 102.

[0036] The connecting seat 103 can effectively improve the connection stiffness between the foundation units 101. If only the stirrup groove is used without the connecting seat, the rigidity of the entire base plate will be insufficient, and stress will be concentrated at the intersection of the stirrup grooves, which will easily lead to collapse.

[0037] Each connecting seat 103 can connect four stirrup slots 102 on the plane, and has a stirrup mechanical connection device 1031 on the top surface that can connect with the mechanical connection stirrup 105B of the cast-in-place rib beam. The stirrup mechanical connection device 1031 is embedded in the connecting seat 103. The upper end surface of the stirrup mechanical connection device 1031 is flush with or slightly smaller than the top surface of the connecting seat to facilitate the stacking and transportation of precast base plate units.

[0038] The mechanical connection stirrup 105B includes a lower stirrup section 105B1 and an upper stirrup section 105B2, which are respectively installed at the lower and upper parts of the stirrup mechanical connection device 1031; the lower stirrup section 105B1 is pre-embedded in the connection seat, and the hook of the lower stirrup section 105B1 is bent and lapped on the bottom plate reinforcement 104. The upper and lower parts of the stirrup mechanical connection device 1031 are respectively fixed to the lower stirrup section and the upper stirrup section by threaded connection.

[0039] In this embodiment, the stirrup groove 102 is elongated and open at the top to form a U-shaped groove with an axial cross section; at least one end of the stirrup groove 102 is connected to the connecting seat 103, the side of the stirrup groove is integrally formed with the bottom of the rib beam, and the bottom surface of the stirrup groove faces the ground, forming a stable support and tensile force system.

[0040] In this embodiment, the precast base plate unit is provided with a single layer of bidirectional base plate reinforcement 104. The base plate reinforcement 104 intersects and passes through the cavity of the base plate and stirrup groove of the foundation unit 101. The base plate reinforcement 104 extends to the edge of the precast base plate unit 1 and bends outwards. The base plate reinforcement 104 is staggered to avoid interference.

[0041] In this embodiment, the precast base plate units 1 are formed by cast-in-place concrete to form secondary beams 3, and the outermost precast base plate unit 1 is fixed to the outer frame beam 2 by edge reinforcement.

[0042] This invention also provides a construction method for a precast hollow floor slab, the steps of which include:

[0043] S1. Select an appropriate number and size of precast base plate units 1 according to the construction plan, taking into account the width requirements of the secondary beams 3 and the edge distance requirements of the frame beams 2 between the precast base plate units, and ensure that the precast base plate units 1 can cover the construction area.

[0044] S2. The construction of precast base plate unit 1 adopts side support. Vertical support is set in the middle of the secondary beam 3, and horizontal support is set along the four sides of the precast base plate unit to bear the self-weight of the component and the live load; lay the precast base plate unit 1.

[0045] S3. Install the beam reinforcement 301 required for the cast-in-place secondary beam, the beam reinforcement structure as follows: Figure 7 As shown, the hollow inner mold is fixed on the installation groove of the foundation unit in the precast base plate unit, and the top plate reinforcement 106 is set.

[0046] S4. Install integral stirrups 105A in the plane of the precast base plate unit, hook the lower end of integral stirrups 105A to the base plate reinforcing bars 104 that protrude from the stirrup groove, and hook the upper end of integral stirrups to the top plate reinforcing bars 106.

[0047] S5. Connect the lower end of the upper section 105B2 of the stirrup to the stirrup mechanical connection device 1031, and hook the upper end to the top slab reinforcement 106;

[0048] S6. Cast-in-place concrete is used to form rib beams and a cast-in-place top slab. The cast-in-place top slab, rib beams, and multiple precast bottom slab units form a hollow floor slab after construction.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hollow floor slab with a precast base, characterized in that: It includes a base slab and a top slab. The base slab is formed by splicing precast base slab units and casting them in place. The top slab is cast in place from the base slab. The precast base plate unit is formed by an array of cast-in-place foundation units; a stirrup groove is formed between adjacent foundation units for arranging integral stirrups.

2. A hollow floor slab with a precast base plate according to claim 1, characterized in that: The foundation unit is recessed in the middle and forms a trough shape, with the sides protruding upwards to form the bottom of the rib beams of the hollow floor slab. The stirrup grooves are cast integrally with the bottom of the rib beams.

3. A hollow floor slab with a precast base plate according to claim 1, characterized in that: The four corresponding corners of adjacent basic units are cast together as one unit through connecting seats.

4. The hollow floor slab with precast base plate according to claim 3, characterized in that: The connecting seat connects four stirrup grooves on a plane, and a stirrup mechanical connection device is pre-embedded on the top surface of the connecting seat. The stirrup mechanical connection device is used to connect the mechanical connection stirrups provided on the upper part.

5. The hollow floor slab with precast base plate according to claim 4, characterized in that: The upper part of the stirrup groove is open to form a U-shaped groove; at least one end of the stirrup groove is connected to the connecting seat, the side of the stirrup groove is integrally cast with the bottom of the rib beam, and the bottom edge of the stirrup groove faces the ground.

6. The hollow floor slab with precast base plate according to claim 5, characterized in that: The precast base slab unit is provided with a single layer of bidirectional base slab reinforcement. The base slab reinforcement intersects and passes through the cavity of the base slab and stirrup groove of the foundation unit, and the base slab reinforcement extends to the edge of the precast base slab unit and outwards. The top slab is provided with top slab reinforcement.

7. The hollow floor slab with precast base plate according to claim 6, characterized in that: The adjacent precast base plate units are connected by cast-in-place concrete to form secondary beams, and the outermost precast base plate unit is fixed to the outer frame beam by the edge reinforcement bars.

8. The hollow floor slab with precast base plate according to claim 6, characterized in that: It also includes integral stirrups, which are set in the stirrup groove. The lower end of the integral stirrup is hooked to the exposed bottom slab reinforcement in the stirrup groove, and the upper end of the integral stirrup is hooked to the top slab reinforcement.

9. The hollow floor slab with precast base plate according to claim 4, characterized in that: The mechanical connection stirrup includes a lower stirrup section and an upper stirrup section. The lower end of the lower stirrup section overlaps with the bottom slab reinforcement of the precast bottom slab unit, and the upper end is connected to the mechanical connection device of the stirrup. The lower end of the upper stirrup section is connected to the mechanical connection device of the stirrup, and the upper end is hooked to the top slab reinforcement.

10. A construction method for a precast hollow floor slab, characterized in that: S1. Select multiple precast base plate units according to the construction plan, taking into account the width requirements of the cast-in-place secondary beams between each precast base plate unit and the edge distance requirements with the frame beam, so that multiple precast base plate units can cover the construction area. S2. Perform edge support construction, set up vertical supports at the middle position corresponding to the secondary beam, and set up horizontal supports along the four sides of the precast base plate unit to bear the self-weight and construction live load; lay the precast base plate unit; S3. Install the beam reinforcement required for the secondary beam casting, and install the hollow inner formwork in the installation area of ​​the foundation unit, and set the top slab reinforcement; S4. Install integral stirrups in the stirrup groove, hook the lower end of the integral stirrups to the exposed bottom plate reinforcement in the stirrup groove, and hook the upper end of the stirrups to the top plate reinforcement; S5. Install mechanical connection stirrups on the connecting seat using the pre-embedded stirrup mechanical connection device, connect the lower end of the upper section of the stirrup to the stirrup mechanical connection device, and hook the upper end to the top plate reinforcement. S6. Cast-in-place concrete to form a hollow floor slab consisting of a base slab, ribs, and a top slab.

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