Built-in truss form-removal-free composite floor slab structure

Abstract

The utility model discloses a formwork-removal-free composite floor slab structure with built-in trusses. A composite floor slab comprises a formwork-removal-free, the trusses and connecting ribs. A plurality of trusses are arranged on the non-dismantling formwork at intervals, the lower portions of the trusses are embedded in the non-dismantling formwork, and the upper portions of the trusses are connected through connecting ribs. The end parts of the connecting ribs extend to the edges of the plate bodies of the non-dismantling formworks, so that the adjacent non-dismantling formworks can be seamlessly spliced; the truss is composed of an upper chord rib, two lower chord ribs and two web ribs. The upper chord rib and the lower chord ribs are straight ribs, the two lower chord ribs are located on the two sides of the lower portion of the upper chord rib respectively, and the lower chord ribs and the upper chord rib extend in the same direction. The upper ends of the web bars are connected with the upper chord bars, and the lower ends of the web bars are connected with the lower chord bars; the lower chord ribs are correspondingly pre-buried in the non-dismantling formworks; the connecting ribs comprise longitudinal connecting ribs and transverse connecting ribs. The weight of the composite floor slab can be reduced, and the field installation efficiency of the composite floor slab can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building engineering, in particular to a built-in truss formwork-free composite floor structure. Background Art

[0002] Composite floor is a kind of prefabricated building component that has emerged in China in recent years. The bottom steel bar of the floor is cast in the concrete slab in the factory in advance, and then transported to the construction site for secondary reinforcement, and then concrete is poured. Because of the secondary superposition process of new and old concrete, it is usually called "composite floor". In layman's terms, composite floor is a concrete floor that is prefabricated half in the factory and cast half on site.

[0003] The existing composite floor structure is mainly precast concrete composite floor. The steel bars at the bottom of the precast concrete composite floor are embedded in the composite floor, and the composite floor is cast in one step in the factory. The thickness of the composite floor is generally 60mm, which is heavy and difficult to transport and hoist. During on-site installation, a 300mm wide gap is generally required between the composite floors, which requires on-site formwork and steel bar binding. The cast-in-place joints require on-site secondary formwork and demoulding, which is complicated and inefficient. In order to solve the defects of the existing composite floor, a new composite floor structure is proposed. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a composite floor structure with built-in trusses and no need to remove formwork, aiming to reduce the weight of the composite floor and improve the on-site installation efficiency of the composite floor.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model provides a built-in truss formwork-free composite floor structure, the composite floor comprising a non-removal formwork, trusses and connecting bars; a plurality of trusses are arranged at intervals on the non-removal formwork, the lower part of each truss is pre-embedded in the non-removal formwork, and the upper parts of each truss are connected to each other by connecting bars; the end of the connecting bar extends to the edge of the plate body of the non-removal formwork, so that adjacent non-removal formworks can be seamlessly spliced.

[0006] Furthermore, the truss is composed of an upper chord, two lower chords and two web reinforcements; the upper chord and the lower chord are both straight reinforcements, the two lower chords are respectively located on both sides below the upper chord, and the lower chord extends in the same direction as the upper chord; the web reinforcement is a curved reinforcement, the upper end of the web reinforcement is connected to the upper chord, and the lower end of the web reinforcement is connected to the lower chord; the lower chord is correspondingly embedded in the disassembly-free formwork.

[0007] Furthermore, the connecting bars include longitudinal connecting bars and transverse connecting bars. The longitudinal connecting bars extend in the same direction as the upper chord bars. The longitudinal connecting bars are fixedly connected to the abdominal bars, and the transverse connecting bars are fixedly connected to the longitudinal connecting bars.

[0008] Furthermore, on the same truss, the upper chord and the two lower chords are connected to the inner sides of the two web reinforcements, and the two longitudinal connecting bars are respectively connected to the outer sides of the two web reinforcements.

[0009] Furthermore, the transverse connecting reinforcement is a straight reinforcement, and the transverse connecting reinforcement is perpendicular to the longitudinal connecting reinforcement.

[0010] Furthermore, the heights of the longitudinal connecting bars on both sides of the same truss are equal, and the transverse connecting bars are arranged above the longitudinal connecting bars.

[0011] Furthermore, the non-disassembly formwork is cast by high-strength fiber concrete.

[0012] Beneficial effects: The utility model provides a built-in truss composite floor structure without dismantling formwork. The reinforcement system of the composite floor is uniformly integrated on the dismantling formwork and prefabricated. The dismantling formwork can greatly reduce the weight of the composite floor, making transportation and lifting convenient. The floor reinforcement system is cast and formed at one time, without the need for secondary lamination, and the construction efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 A schematic diagram of the cross section of a composite floor slab. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings.

[0015] As attached Figure 1 The composite floor structure with built-in trusses and free formwork, the composite floor comprises free formwork 1, trusses 2 and connecting bars. Multiple trusses 2 are arranged at intervals on the free formwork 1, the lower part of each truss 2 is embedded in the free formwork 1, and the upper part of each truss 2 is connected as a whole by connecting bars. The end of the connecting bar extends to the edge of the board of the free formwork 1, so that adjacent free formworks 1 can be seamlessly spliced.

[0016] Unlike ordinary composite floor slabs, the bottom plate of the utility model is a non-disassembly formwork 1, and the non-disassembly formwork 1 does not participate in the structural force. Therefore, during the on-site installation process, the non-disassembly formwork 1 can be seamlessly and closely installed, so there is no need to cast the joints, and naturally there is no need for secondary formwork and demolding, thereby improving the on-site construction efficiency. In addition, due to the use of the non-disassembly formwork 1, the weight of the composite floor slab of the utility model is greatly reduced, which is convenient for prefabrication, transportation and hoisting. The end of the connecting bar extends to the edge of the plate body of the non-disassembly formwork 1. When the non-disassembly formwork 1 is seamlessly spliced, the steel bar structures on the adjacent non-disassembly formworks 1 are also spliced ​​together, so that the steel bar structures on the non-disassembly formworks 1 can better form a whole.

[0017] As attached Figure 1As shown in , a single truss 2 is composed of an upper chord 3, two lower chords 4 and two webs 5. The upper chord 3 and the lower chord 4 are both straight bars, and the upper chord 3 and the two lower chords 4 are arranged in a triangular shape. The two lower chords 4 are respectively located on both sides below the upper chord 3, and the lower chord 4 extends in the same direction as the upper chord 3. The webs 5 are curved bars. In one embodiment, the webs 5 are wavy bars, the upper ends of the webs 5 are connected to the upper chord 3, and the lower ends of the webs 5 are connected to the lower chord 4. The three longitudinal steel bars are welded into one body by the wavy webs 5 on both sides to form a truss 2 with good force-bearing performance. During specific production, the lower part of the truss 2, including the lower chord 4 and the bottom of the webs 5, is correspondingly pre-buried in the non-dismantling formwork 1.

[0018] The connecting bars include longitudinal connecting bars 6 and transverse connecting bars 7. The longitudinal connecting bars 6 extend in the same direction as the upper chord bars 3. The longitudinal connecting bars 6 are fixedly connected to the web bars 5. The transverse connecting bars 7 are fixedly connected to the longitudinal connecting bars 6. Both ends of the transverse connecting bars 7 and the longitudinal connecting bars 6 are vertically flush with the edge of the board of the non-dismantling formwork 1. Through the transverse connecting bars 7 and the longitudinal connecting bars 6, the multiple trusses 2 on the non-dismantling formwork 1 are connected as a whole to form a high-strength load-bearing skeleton. Figure 1 As shown in FIG. 1 , each of the two web ribs 5 has a longitudinal connecting rib 6 , and a plurality of transverse connecting ribs 7 are arranged in the length direction of the longitudinal connecting ribs 6 .

[0019] On the same truss 2, the opposite sides of the two webs 5 are the inner sides, the opposite sides of the two webs 5 are the outer sides, the upper chord 3 and the two lower chords 4 are connected to the inner sides of the two webs 5, and the two longitudinal connecting bars 6 are connected to the outer sides of the two webs 5. In practical applications, the upper chord 3, the lower chord 4 and the webs 5 are first prepared into a truss 2, and then the bottom of the truss 2 is embedded in the non-disassembly formwork 1, and then the longitudinal connecting bars 6 and the transverse connecting bars 7 are welded or tied to the truss 2. The longitudinal connecting bars 6 are located on the outer sides of the webs 5, which makes it easier to weld and fix the longitudinal connecting bars 6 to the webs 5.

[0020] As attached Figure 1 In one embodiment shown, the transverse connecting ribs 7 are straight ribs, and the transverse connecting ribs 7 are perpendicular to the longitudinal connecting ribs 6 .

[0021] The heights of the longitudinal connecting bars 6 on both sides of the same truss 2 are equal, and the transverse connecting bars 7 are arranged above the longitudinal connecting bars 6 so that the heights of both ends of the transverse connecting bars 7 are consistent, so that the ends of the transverse connecting bars 7 on adjacent composite floors can correspond to each other.

[0022] The non-disassembly formwork 1 is cast from high-strength fiber concrete, such as UHPC.

[0023] A construction process for a built-in truss composite floor structure without formwork removal includes a factory production stage and an on-site installation stage. The factory production stage includes the following steps:

[0024] Step S1: Laying the side formwork, the range of the side formwork is the size of the composite floor slab, and the height of the side formwork is the design thickness of the non-removal formwork 1;

[0025] Step S2: preparing the steel truss 2, and laying the truss 2 in the side form according to the design requirements;

[0026] Step S3: pouring high-strength fiber concrete on the side form to a designed thickness to form a non-dismantling formwork 1, and curing and forming;

[0027] Step S4: connecting the trusses 2 by longitudinal connecting bars 6 and transverse connecting bars 7. Specifically, firstly welding the longitudinal connecting bars 6 to the web bars 5, and then welding the transverse connecting bars 7 to the longitudinal connecting bars 6;

[0028] Step S5: demoulding to obtain a composite floor slab;

[0029] The on-site installation phase includes the following steps:

[0030] Step T1: Establish temporary support for the bottom of the slab. Since the steel truss 2 and the non-dismantling formwork 1 are cast in an integrated manner to form a high-rigidity load-bearing skeleton, there are very few supports, and generally one support is calculated to be 2.5 meters long;

[0031] Step T2: hoist the composite floor slab into place, and install the composite floor slab seamlessly and closely;

[0032] Step T3: Improve the embedded system on the composite floor, that is, embed various pipelines;

[0033] Step T4: pouring concrete on the composite floor slab and curing it;

[0034] Step T5: Remove the temporary support at the bottom of the board.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A composite floor structure with built-in trusses and free formwork removal, characterized in that: The composite floor comprises a non-dismantling formwork (1), a truss (2) and connecting bars; a plurality of trusses (2) are arranged at intervals on the non-dismantling formwork (1), the lower part of each truss (2) is pre-buried in the non-dismantling formwork (1), and the upper parts of each truss (2) are connected to each other through connecting bars; the end of the connecting bar extends to the plate body edge of the non-dismantling formwork (1), so that adjacent non-dismantling formworks (1) can be seamlessly spliced.

2. The internal truss formwork-free composite floor structure according to claim 1, characterized in that: The truss (2) is composed of an upper chord (3), two lower chords (4) and two webs (5); the upper chord (3) and the lower chord (4) are both straight ribs, the two lower chords (4) are respectively located on both sides below the upper chord (3), and the lower chord (4) and the upper chord (3) extend in the same direction; the webs (5) are curved ribs, the upper end of the webs (5) is connected to the upper chord (3), and the lower end of the webs (5) is connected to the lower chord (4); the lower chords (4) are correspondingly pre-buried in the disassembly-free formwork (1).

3. The internal truss formwork-free composite floor structure according to claim 2, characterized in that: The connecting bars include longitudinal connecting bars (6) and transverse connecting bars (7). The longitudinal connecting bars (6) extend in the same direction as the upper chord bars (3). The longitudinal connecting bars (6) are fixedly connected to the web bars (5), and the transverse connecting bars (7) are fixedly connected to the longitudinal connecting bars (6).

4. The internal truss formwork-free composite floor structure according to claim 3, characterized in that: On the same truss (2), the upper chord (3) and the two lower chords (4) are connected to the inner sides of the two webs (5), and the two longitudinal connecting bars (6) are respectively connected to the outer sides of the two webs (5).

5. The internal truss formwork-free composite floor structure according to claim 4, characterized in that: The transverse connecting ribs (7) are straight ribs, and the transverse connecting ribs (7) are perpendicular to the longitudinal connecting ribs (6).

6. The internal truss formwork-free composite floor structure according to claim 5, characterized in that: The heights of the longitudinal connecting bars (6) on both sides of the same truss (2) are equal, and the transverse connecting bars (7) are arranged above the longitudinal connecting bars (6).

7. The internal truss formwork-free composite floor structure according to claim 6, characterized in that: The non-disassembly formwork (1) is cast from high-strength fiber concrete.

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