Large-span thick ratio beam and slab integrated prefabricated unit and installation method

Abstract

The application relates to a large-span-thickness-ratio beam-plate integrated prefabricated unit, which comprises a prefabricated integrated beam plate, a pre-embedded fixing component and a prestress applying component; the prefabricated integrated beam plate comprises a flat plate and two flanges arranged on the bottom surface of the flat plate and spaced apart left and right; the pre-embedded fixing component is arranged in the flanges of the prefabricated integrated beam plate, and the pre-embedded fixing components in the left and right flanges are one-to-one corresponding; the prestress applying component is connected between the two corresponding pre-embedded fixing components. The application aims to provide a large-span-thickness-ratio beam-plate integrated prefabricated unit and a mounting method which can significantly improve the construction speed and reduce the engineering cost. The application has the advantages that the combination of the pre-embedded fixing component and the prestress applying component arranged in the prefabricated integrated beam plate can make the flat plate on the prefabricated integrated beam plate in an inverted arch state, thereby significantly reducing the deformation amount of the prefabricated integrated beam plate in the mounting process and avoiding the cracking of the prefabricated component.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building technology, in particular to a large-span-thickness-ratio beam-slab integrated prefabricated unit and a mounting method. BACKGROUND

[0002] In recent years, prefabricated buildings have developed rapidly in China.

[0003] When the existing prefabricated concrete buildings use composite floors and prefabricated composite beams, supports are usually needed during the construction stage. When the floor height is large, the support system is complex and expensive. Using beam-slab integrated prefabricated units can achieve support-free and form-free prefabricated concrete structure construction, speed up construction, and reduce project measure costs. To minimize the impact of ribbed beams on indoor space, it is necessary to increase the rib spacing of beam-slab integrated units in certain cases. To reduce the weight of prefabricated components and improve the convenience of transportation and installation, it is often desirable to make the prefabricated slab thickness between the ribs of the beam-slab integrated unit as small as possible. However, when the prefabricated slab has a large span-thickness ratio, there are problems of excessive deformation and cracking during demolding, transportation, and hoisting. SUMMARY

[0004] The purpose of the present application is to provide a large-span-thickness-ratio beam-slab integrated prefabricated unit and a mounting method that can significantly improve construction speed and reduce engineering costs.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A large-span-thickness-ratio beam-slab integrated prefabricated unit, comprising a prefabricated integrated beam-slab, a pre-embedded fixing component, and a prestress application component; the prefabricated integrated beam-slab comprises a flat plate and two flanges arranged at the bottom of the flat plate and spaced apart left and right, each flange extending forward and backward; the pre-embedded fixing component is arranged in the flange of the prefabricated integrated beam-slab, and the pre-embedded fixing components in the left and right flanges correspond one-to-one; the prestress application component is connected between the two corresponding pre-embedded fixing components, and the prestress application component applies a reverse arching force to the flat plate by pulling the pre-embedded fixing components.

[0007] A mounting method for a large-span-thickness-ratio beam-slab integrated prefabricated unit, comprising the following steps: S1. The prefabricated integrated beam-slab is poured and completed in a mold; S2. After the concrete of the prefabricated integrated beam-slab hardens, it is pulled out of the mold using beam hangers and truss reinforcement; S3. The prefabricated integrated beam-slab is placed on a support frame so that it has a construction operation space below; S4. The pull ring is screwed into the bolt connection section; S5. The pull hooks at both ends of the rigging screw are buckled into the pull ring; S6. The rigging screw is adjusted so that the pull rods on both sides of the rigging screw are in a tensioned state, and prestress is applied to the prefabricated integrated beam-slab in the vertical span direction; S7. After the prefabricated integrated beam-slab is hoisted into position and the surface layer concrete is poured and reaches the required strength, the rigging screw and the pull ring are removed.

[0008] Compared with the prior art, the present application has the advantages of:

[0009] 1. The present application takes full advantage of the geometric characteristics of the beam-slab integrated prefabricated unit channel section, and the combination of the embedded fixing assembly and the prestress applying assembly arranged in the prefabricated integrated beam-slab can make the flat plate on the prefabricated integrated beam-slab in an inverted arch state, thereby significantly reducing the deformation amount of the prefabricated integrated beam-slab during installation, avoiding cracking of the prefabricated component, and making it possible to use the large-span-thick-ratio beam-slab integrated prefabricated unit.

[0010] 2. The prestress applying assembly has small self-weight, is convenient to disassemble and assemble, and is convenient for on-site manual operation, thereby significantly reducing the construction cost.

[0011] 3. The combination use of the beam lug and the truss reinforcement can reduce the deformation amount of the prefabricated integrated beam-slab during demolding and hoisting, and avoid cracking of the prefabricated component. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of the prefabricated integrated beam-slab.

[0013] Figure 2 is a front view of Figure 1 .

[0014] Figure 3 is a structural schematic view of the length adjusting member.

[0015] Figure 4 is a structural schematic view of the pull ring.

[0016] Figure 5 is a structural schematic view of the embedded fixing assembly.

[0017] Figure 6 is a schematic view of the embedded position of the embedded fixing assembly.

[0018] Figure 7 is a schematic view of the installation state of the large-span-thick-ratio beam-slab integrated prefabricated unit.

[0019] Figure 8 is a schematic view of the installation state of the large-span-thick-ratio beam-slab integrated prefabricated unit.

[0020] Figure 9 is a schematic view of the installation state of the large-span-thick-ratio beam-slab integrated prefabricated unit.

[0021] Explanation of signs: 1 prefabricated integrated beam slab, 1-1 flat plate, 1-2 flange, 1-3 groove, 1-4 longitudinal steel bar, 1-5 truss steel bar, 1-6 beam lug, 1-7 shear key groove, 2 embedded fixing assembly, 2-1 anchoring section, 2-2 bolt connection section, 2-3 screw hole, 3 prestress application assembly, 3-1 pull ring, 3-2 cable spiral buckle, 3-3 pull hook. DETAILED DESCRIPTION

[0022] The content of the application will be described in detail below in combination with the drawings and examples of the specification:

[0023] As Figures 1 to 9 shown is an embodiment schematic diagram of a large-span-thickness-ratio beam slab integrated prefabricated unit and installation method provided by the application.

[0024] A large-span-thickness-ratio beam slab integrated prefabricated unit, comprising a prefabricated integrated beam slab 1, an embedded fixing assembly 2, and a prestress application assembly 3;

[0025] The prefabricated integrated beam slab 1 comprises a flat plate 1-1 and two flanges 1-2 arranged at the bottom surface of the flat plate 1-1 and spaced apart left and right, and each flange 1-2 extends forward and backward;

[0026] The embedded fixing assembly 2 is arranged in the flange 1-2 of the prefabricated integrated beam slab 1, and the embedded fixing assemblies 2 in the left and right flanges 1-2 correspond one by one;

[0027] The prestress application assembly 3 is connected between two corresponding embedded fixing assemblies 2, and the prestress application assembly 3 applies a reverse arching force to the flat plate 1-1 by pulling the embedded fixing assembly 2.

[0028] The embedded fixing assembly 2 comprises an anchoring section 2-1 and a bolt connection section 2-2, and the end of the bolt connection section 2-2 is provided with a screw hole 2-3, and the screw hole 2-3 is located on the inner wall surface of the flange 1-2;

[0029] The anchoring section 2-1 and the bolt connection section 2-2 are arranged vertically.

[0030] The prestress application assembly 3 comprises a length adjusting member and two pull rings 3-1 arranged on the left and right sides of the length adjusting member, and the pull rings 3-1 are fixed in the screw holes 2-3 by screwing.

[0031] The embedded fixing assembly 2 is arranged in several groups, and the embedded fixing assemblies 2 on the same side are arranged in the front and back directions with a spacing determined according to force calculation.

[0032] The length adjusting member is a cable spiral buckle 3-2, and the outer end of the screw rod of the cable spiral buckle 3-2 is provided with a pull hook 3-3 matched with the pull ring 3-1.

[0033] The outer side of the flange 1-2 is flush with the side of the flat plate 1-1, and a groove 1-3 is arranged at the corner of the outer side where the flange 1-2 intersects with the flat plate 1-1. The depth of the groove 1-3 can be determined according to stress calculation.

[0034] The wall surface of the groove 1-3 is rough.

[0035] The interior of the flange 1-2 is provided with longitudinal steel bars 1-4 and stirrups.

[0036] The flat plate 1-1 is provided with truss steel bars 1-5 arranged in an array and perpendicular to the flange 1-2. The truss steel bars 1-5 serve as hoisting points in the plate.

[0037] The top surface of the flat plate 1-1 is rough, and the bottom is provided with a two-way steel mesh.

[0038] The flat plate 1-1 is provided with a plurality of beam hangers 1-6 on the left and right sides of the top surface, the beam hangers 1-6 on the two sides correspond to each other one by one, and the beam hangers 1-6 are located on the upper side of the flange 1-2.

[0039] The beam hangers 1-6 on the same side are arranged in the front and back directions at intervals, and the interval is determined according to stress calculation.

[0040] The flange 1-2 end of the prefabricated integrated beam plate 1 at the beam column joint is provided with a shear key groove 1-7. The longitudinal steel bars 1-7 on the flange 1-2 extend into the beam column joint.

[0041] A mounting method of a large-span-thickness-ratio beam plate integrated prefabricated unit, which comprises the following steps:

[0042] 1. The prefabricated integrated beam plate 1 is completed by pouring in the mold;

[0043] 2. After the concrete of the prefabricated integrated beam plate 1 hardens, the beam hangers 1-6 and the truss steel bars 1-5 are used to take it out of the mold (see Figure 7 );

[0044] 3. The prefabricated integrated beam plate 1 is placed on the support frame, so that it has a construction operation space below;

[0045] 4. The pull ring 3-1 is screwed into the bolt connection section 2-2 (see Figure 8 );

[0046] 5. The pull hooks 3-3 at both ends of the rigging screw buckle 3-2 are buckled into the pull ring 3-1;

[0047] 6. Adjust the rigging screw buckle 3-2 so that the pull rods on both sides of the rigging screw buckle 3-2 are in a tensioned state, and prestress is applied to the prefabricated integrated beam plate in the vertical span direction (see Figure 9 ).

[0048] 7. After the precast integrated beam-slab 1 is hoisted into place and the surface concrete is poured and reaches the strength, the cable fittings 3-2 and 3-1 are removed.

Claims

1. A prefabricated unit for large-span beams and slabs with a thickness ratio, characterized in that: The application relates to a prefabricated integrated beam plate (1), a pre-buried fixing assembly (2) and a prestress applying assembly (3). The prefabricated integrated beam plate (1) comprises a flat plate (1-1) and two flanges (1-2) arranged on the bottom surface of the flat plate (1-1) and spaced apart left and right; each flange (1-2) extends forward and backward. The pre-buried fixing assembly (2) is arranged in the flange (1-2) of the prefabricated integrated beam plate (1), and the pre-buried fixing assemblies (2) in the left and right flanges (1-2) are one-to-one corresponding. The outer side of the flange (1-2) is flush with the side of the corresponding side of the flat plate (1-1), and a groove (1-3) is arranged at the outer side corner where the flange (1-2) and the flat plate (1-1) intersect. The inside of the flange (1-2) is provided with longitudinal steel bars (1-4) and stirrups. The prestress applying assembly (3) is connected between two corresponding pre-buried fixing assemblies (2), and the prestress applying assembly (3) applies reverse arching force to the flat plate (1-1) by pulling the pre-buried fixing assembly (2). The pre-buried fixing assembly (2) comprises an anchoring section (2-1) and a bolt connecting section (2-2), and the end of the bolt connecting section (2-2) is provided with a screw hole (2-3), and the screw hole (2-3) is located on the inner wall surface of the flange (1-2). The prestress applying assembly (3) comprises a length adjusting piece and two pull rings (3-1) arranged on the left and right sides of the length adjusting piece, and the pull ring (3-1) is fixed in the screw hole (2-3) by screwing. The length adjusting piece is a rigging screw clamp (3-2), and the outer end of the screw rod of the rigging screw clamp (3-2) is provided with a pull hook (3-3) matched with the pull ring (3-1). After the prefabricated integrated beam plate (1) is hoisted into position, the surface concrete is poured and reaches the strength, the rigging screw clamp (3-2) and the pull ring (3-1) are removed.

2. The large-span-thin-depth ratio beam-slab integrated prefabricated unit according to claim 1, characterized in that: The flat plate (1-1) is provided with truss steel bars (1-5) arranged in an array and perpendicular to the flange (1-2).

3. The large-span-thin-depth ratio beam-slab integrated prefabricated unit according to claim 1, characterized in that: The top surface of the flat plate (1-1) is a rough surface, and the bottom is provided with a bidirectional steel mesh.

4. The large-span-thin-depth ratio beam-slab integrated prefabricated unit according to claim 1, characterized in that: The top left and right sides of the flat plate (1-1) are provided with a plurality of beam upper lifting lugs (1-6), the beam upper lifting lugs (1-6) on the two sides are one-to-one corresponding, and the beam upper lifting lugs (1-6) are located on the upper side of the flange (1-2).

5. The large-span-thin-depth ratio beam-slab integrated prefabricated unit according to claim 1, characterized in that: The prefabricated integrated beam plate (1) located at the beam column joint is provided with a shear key groove (1-7) at the end of the flange (1-2).

6. The method of claim 1-5, wherein, It comprises the following steps: S1. The prefabricated integrated beam plate (1) is poured in a mold; S2. After the concrete of the prefabricated integrated beam plate (1) hardens, the beam upper lifting lugs (1-6) and the truss steel bars (1-5) are used to take the prefabricated integrated beam plate (1) out of the mold; S3. The prefabricated integrated beam plate (1) is placed on a supporting frame, so that a construction operation space is formed below the prefabricated integrated beam plate (1); S4. The pull ring (3-1) is screwed into the bolt connecting section (2-2); S5. The pull hooks (3-3) at the two ends of the rigging screw clamp (3-2) are buckled into the pull ring (3-1); S6. The rigging screw clamp (3-2) is adjusted so that the pull rods on the two sides of the rigging screw clamp (3-2) are in a tension state, and prestress is applied to the prefabricated integrated beam plate (1) in the vertical span direction. S7. After the precast integrated beam-slab (1) is hoisted into position, and the surface layer concrete is poured and reaches the strength, the cable gear spiral buckle (3-2) and the pull ring (3-1) are removed.

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