A composite and demoulding-free mould combined prefabricated hollow column

Abstract

This utility model belongs to the field of prefabricated building engineering technology, and specifically relates to a prefabricated hollow column combining overlapping and formwork-free installation. It includes a hollow column body and a column reinforcement system; the hollow column body is a cuboid structure with a cavity, sequentially enclosed by an A-side overlapping column slab, a C-side formwork-free installation, a B-side overlapping column slab, and a D-side formwork-free installation. The column reinforcement system is located within the cavity, with one opposite side of the system embedded in the A-side and B-side overlapping column slabs respectively. Two sets of reinforcing steel meshes are provided on the other opposite sides of the system, embedded in the C-side and D-side formwork-free installations respectively. This utility model adopts a two-sided overlapping and two-sided formwork-free installation structure. The overlapping surface firmly embeds both sides of the column reinforcement cage into the concrete slab, resulting in a strong and non-deformable overall column. The tie rods of the formwork-free installation fully utilize the tie rod system of the column reinforcement cage, reducing production costs.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building engineering technology, and specifically relates to a prefabricated hollow column that combines overlapping and formwork-free assembly. Background Technology

[0002] Precast hollow columns are a type of assembled vertical structure. Hollow columns are lightweight and easy to connect with the steel reinforcement system. Existing precast hollow column structures include four-sided stacked hollow columns and formwork-free hollow columns.

[0003] Four-sided composite hollow columns are made by hollowing out the internal concrete of a solid column. They are generally formed using centrifugal molding, which requires large equipment. The inner wall of the hollow column cannot form a rough surface, meaning it cannot effectively overlap with the cast-in-place concrete, which seriously affects the column's load-bearing performance. Therefore, in order to meet design requirements, the hollow column can only be designed to be larger, which affects the effective usable area of ​​the building. Different types of columns require centrifugal molding equipment of different specifications, resulting in large investments and low efficiency.

[0004] Hollow columns without formwork are formed by wrapping the column's reinforcing cage with four-sided formwork. They are produced using a flipping and inverting molding process, requiring the column's reinforcing cage to be flipped four times and cured four times. This process is lengthy and inefficient. Because the formwork is thin, temporary support arrangements are difficult, and the insertion depth of tie rods is hard to control, easily leading to formwork bulging during later pouring. The column's reinforcing cage has low rigidity, making the formwork prone to cracking during the flipping process. Misalignment at the four corners is also common, creating gaps that easily lead to cracking and grout leakage during later pouring. Furthermore, serious violations occur during the molding process, such as the lifting point being welded only to the main reinforcing bars, damaging them and affecting structural safety. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a precast hollow column combining overlapping and formwork-free construction, which solves the problems of difficult temporary support arrangement, difficulty in controlling the insertion depth of tie rods, easy formwork bulging, low stiffness of column steel cage, easy formwork cracking due to overturning, and easy misalignment and grout leakage at the four corners caused by thin formwork.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a precast hollow column combining overlapping and formwork-free installation, including a hollow column body and a column reinforcement system; wherein the hollow column body is a cuboid structure with a cavity formed by sequentially enclosing an A-side overlapping column slab, a C-side formwork-free installation, a B-side overlapping column slab, and a D-side formwork-free installation, the column reinforcement system is set in the cavity, and one opposite side of the column reinforcement system is respectively embedded in the A-side overlapping column slab and the B-side overlapping column slab, and the other opposite side of the column reinforcement system is provided with two sets of stressed steel reinforcement meshes, the two sets of stressed steel reinforcement meshes are respectively embedded in the C-side formwork-free installation and the D-side formwork-free installation.

[0008] The stressed steel mesh includes formwork-free longitudinal bars, tie bars, and multiple sets of transverse bar assemblies. The multiple sets of transverse bar assemblies are arranged sequentially at intervals along the length of the hollow column. Each transverse bar assembly extends along the width of the hollow column and its two ends are respectively connected to one opposite side of the column steel reinforcement system.

[0009] The formwork-free longitudinal reinforcement is located on the outside of multiple sets of transverse reinforcement assemblies and is perpendicular to the transverse reinforcement assemblies. The formwork-free longitudinal reinforcement is connected to the column reinforcement system through multiple tie bars.

[0010] The horizontal reinforcement assembly includes A-side composite column slab stirrups and B-side composite column slab stirrups. The A-side composite column slab stirrups and B-side composite column slab stirrups have the same structure, both being L-shaped structures composed of horizontal and vertical stirrups. The horizontal stirrups of the A-side composite column slab stirrups and B-side composite column slab stirrups overlap and are fixed to each other. The vertical stirrups of the A-side composite column slab stirrups and B-side composite column slab stirrups are respectively tied and fixed to one opposite side of the column reinforcement system.

[0011] The formwork-free longitudinal ribs are at least two in number, and the formwork-free longitudinal ribs are tied and fixed to the transverse rib assembly.

[0012] The column reinforcement system is a cuboid structure, which includes multiple main bars arranged in a square and multiple stirrups placed outside the main bars. The stirrups are arranged in a ring shape perpendicular to the main bars and tighten the main bars.

[0013] Both ends of the tie bar are provided with tie hooks, which hook the main bars of the column reinforcement system and the longitudinal bars that do not require formwork removal, respectively, and are tied and fixed.

[0014] The inner side of the D-side non-removable template is provided with an inner lining mold assembly, and an inner lining mold support is provided between the inner lining mold assembly and the column reinforcement system.

[0015] The inner lining mold assembly includes a middle inner lining mold and two side inner lining molds located on both sides of the middle inner lining mold, with through holes provided between the middle inner lining mold and the two side inner lining molds for the tie bar to pass through.

[0016] Both the intermediate inner lining mold and the side inner lining mold are made of steel plate or plastic plate.

[0017] The composite column slab on side A, the formwork that does not need to be removed on side C, the composite column slab on side B, and the formwork that does not need to be removed on side D are all made of cast concrete.

[0018] The advantages and beneficial effects of this utility model are as follows: This utility model provides a precast hollow column combining overlapping and formwork-free design. It adopts a structure of two-sided overlapping and two-sided formwork-free design. The overlapping surface firmly casts both sides of the column's steel cage into the concrete slab, making the column's overall rigidity strong and non-deformable. The formwork-free tie rods make full use of the tie rod system of the column's steel cage, saving a lot of tie rod investment and reducing production costs.

[0019] The templates of this utility model are all cast in the forward direction without dismantling, which makes it easier to control the pre-embedded depth of the tie members and the overall forming accuracy, and will not cause the formwork to bulge; the hoisting and temporary construction supports can be conveniently arranged in the concrete composite slabs on both sides; the molds required for forming are all standardized molds, which have high production efficiency and low cost. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a prefabricated hollow column combining stacking and demolding-free construction according to this utility model;

[0021] Figure 2 This is a structural schematic diagram of the column reinforcement system of this utility model;

[0022] Figure 3 This is one of the schematic diagrams showing the connection between the reinforcing steel mesh and the column reinforcement system in this utility model;

[0023] Figure 4 This is the second schematic diagram showing the connection between the reinforcing steel mesh and the column reinforcement system in this utility model;

[0024] Figure 5 This is a schematic diagram of the forming of the A-side composite column plate in this utility model;

[0025] Figure 6 This is a schematic diagram of the forming of the B-side composite column plate in this utility model;

[0026] Figure 7 This is a schematic diagram of the forming process of the C-side non-removable template in this utility model;

[0027] Figure 8 This is a schematic diagram of the forming process of the D-side non-removable template in this utility model.

[0028] In the diagram: 1. Composite column slab on side A; 2. Composite column slab on side B; 3. Column reinforcement system; 4. Reinforcing bars on composite column slab on side A; 5. Reinforcing bars on composite column slab on side B; 6. Longitudinal reinforcement without formwork removal; 7. Tie bars; 8. Intermediate inner lining formwork; 9. Edge inner lining formwork; 10. Formwork without formwork on side C; 11. Inner lining formwork support; 12. Cavity; 13. Formwork without formwork on side D; B1. Design thickness of composite column slab on side A; B2. Design thickness of composite column slab on side B; D1. Design thickness of formwork without formwork on side C; D2. Design thickness of formwork without formwork on side D; D3. Design thickness of inner lining formwork. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See Figure 1 As shown, this utility model provides a precast hollow column combining overlapping and formwork-free installation, including a hollow column body and a column reinforcement system 3; the hollow column body is a cuboid structure with a cavity 12, which is formed by sequentially enclosing an A-side overlapping column slab 1, a C-side formwork-free installation 10, a B-side overlapping column slab 2, and a D-side formwork-free installation 13. The column reinforcement system 3 is disposed in the cavity 12, and one opposite side of the column reinforcement system 3 is respectively embedded in the A-side overlapping column slab 1 and the B-side overlapping column slab 2. The other opposite side of the column reinforcement system 3 is provided with two sets of stressed reinforcement meshes, which are respectively embedded in the C-side formwork-free installation 10 and the D-side formwork-free installation 13.

[0031] In the embodiments of this utility model, the column reinforcement system 3 is a cuboid structure. The column reinforcement system 3 includes multiple main bars arranged in a square and multiple stirrups arranged outside the multiple main bars. The stirrups are arranged in a ring shape perpendicular to the direction of the main bars and tighten the main bars.

[0032] See Figure 1 As shown in the embodiment of this utility model, the stressed steel reinforcement mesh includes a formwork-free longitudinal reinforcement 6, tie bars 7, and multiple sets of transverse reinforcement assemblies. The multiple sets of transverse reinforcement assemblies are arranged sequentially at intervals along the length direction of the hollow column, and each transverse reinforcement assembly extends along the width direction of the hollow column and its two ends are respectively connected to one opposite side of the column reinforcement system 3. The formwork-free longitudinal reinforcement 6 is set on the outside of the multiple sets of transverse reinforcement assemblies and is perpendicular to the transverse reinforcement assemblies. The formwork-free longitudinal reinforcement 6 is connected to the column reinforcement system 3 through multiple tie bars 7.

[0033] Furthermore, there are at least two longitudinal ribs 6 that do not require demolding; in this embodiment, there are two longitudinal ribs 6 that do not require demolding, and the two longitudinal ribs 6 are located outside the transverse rib assembly and are tied and fixed to the transverse rib assembly.

[0034] See Figure 1As shown in the embodiment of this utility model, the horizontal reinforcement assembly includes A-side composite column slab reinforcement 4 and B-side composite column slab reinforcement 5. The A-side composite column slab reinforcement 4 and B-side composite column slab reinforcement 5 have the same structure, both being L-shaped structures composed of horizontal and vertical reinforcement. The horizontal reinforcement of the A-side composite column slab reinforcement 4 and B-side composite column slab reinforcement 5 overlaps and is tied and fixed, and is pre-embedded in the C-side non-removable formwork 10 or the D-side non-removable formwork 13; the horizontal reinforcement serves as its load-bearing reinforcement, and the specifications and arrangement of the reinforcement are determined by the design. The vertical reinforcement of the A-side composite column slab reinforcement 4 and B-side composite column slab reinforcement 5 is tied and fixed to the stirrups on one opposite side of the column reinforcement system 3, and is pre-embedded in the A-side composite column slab 1 and B-side composite column slab 2, respectively.

[0035] Furthermore, both ends of the tie bar 7 are equipped with tie hooks, which hook onto the main reinforcement bars of the column reinforcement system 3 and the longitudinal reinforcement bars 6 that do not require formwork removal, and are then tied and fixed. The tie bar 7 prevents the formwork from expanding during the pouring of concrete for the hollow column.

[0036] Furthermore, an inner lining mold assembly is provided on the inner side of the D-side non-removable template 13, and an inner lining mold support 11 is provided between the inner lining mold assembly and the column reinforcement system 3. The lower part of the inner lining mold support 11 is supported on the column reinforcement system 3, the upper part supports the inner lining mold assembly, and it also serves as a protective layer pad for the column reinforcement system 3.

[0037] In this embodiment of the invention, the inner lining mold assembly includes a central inner lining mold 8 and two side inner lining molds 9 located on both sides of the central inner lining mold 8. A through hole for the tie bar 7 to pass through is provided between the central inner lining mold 8 and the two side inner lining molds 9. The inner lining mold assembly is supported by an inner lining mold bracket 11, and the tie bars 7 are clamped on both sides to prevent grout leakage when pouring the D-side template 13.

[0038] Specifically, the intermediate inner lining mold 8 and the edge inner lining mold 9 are both made of steel plates or plastic plates. The A-side composite column slab 1 and the B-side composite column slab 2 are both cast in concrete. The A-side composite column slab 1 and the B-side composite column slab 2 are symmetrically arranged, and their inner surfaces are both roughened. The roughened surfaces are later integrally superimposed with the cast-in-place concrete to form a complete load-bearing column structure. The C-side non-removable formwork 10 and the D-side non-removable formwork 13 are made of high-strength concrete and are used only as permanent formwork for the hollow columns; they do not participate in the column's load-bearing capacity.

[0039] See Figure 1As shown in the embodiment of this utility model, the cavity 12 is a hollow structure formed by the A-side composite column plate 1 and the B-side composite column plate 2 arranged opposite to each other in one direction, and the C-side non-removable template 10 and the D-side non-removable template 13 arranged opposite to each other in another direction. Concrete will be poured into the cavity 12 later to form a load-bearing frame column for building structure. The design thicknesses B1 and B2 of the A-side composite column plate, D1 and D2 of the C-side non-removable template, and D3 of the inner lining template are determined according to the design.

[0040] Based on the above embodiments, depending on the actual situation, the two corresponding longitudinal ribs 6 of the C-side non-removable template 10 and the D-side non-removable template 13 can also be connected by an extended S-shaped tie member. That is, the original two tie members 7 can be replaced with an extended S-shaped tie member, and the two ends of the extended S-shaped tie member can be hooked to the two corresponding longitudinal ribs 6 of the C-side non-removable template 10 and the D-side non-removable template 13 respectively.

[0041] This utility model provides a prefabricated hollow column that combines stacking and demolding-free molding. It features a simple structure, precise alignment, and low cost. The specific manufacturing process is as follows:

[0042] Preparation of column reinforcement system 3: Tying main bars and stirrups, see Figure 2 As shown;

[0043] Tie the A-side composite column slab stirrups 4 and the B-side composite column slab stirrups 5 to the column reinforcement system 3. See below. Figure 3 As shown;

[0044] For binding the longitudinal reinforcing bars 6 and tie members 7 that do not require formwork removal, see [link / reference]. Figure 4 As shown;

[0045] Pour concrete into composite column slab 1 on side A, roughen the inner cavity to create a rough surface, see [reference]. Figure 5 As shown;

[0046] Pouring concrete for composite column slab 2 on side B: Pouring while rotating 180°, roughening the inner cavity to create a rough surface, see [link / reference]. Figure 6 As shown;

[0047] Rotate the entire structure 90° and pour the C-side formwork (no need to remove it). See below. Figure 7 As shown;

[0048] Casting D-side formwork without removal 13:

[0049] Place the inner lining mold support 11;

[0050] Install the middle inner liner mold 8 and the side inner liner molds 9;

[0051] Pouring liquid material without removing formwork;

[0052] Curing and shaping complete the product. See below. Figure 8 As shown.

[0053] In this embodiment, both the C-side non-removable template 10 and the D-side non-removable template 13 are cast in the forward direction, which makes it easier to control the pre-embedded depth of the tie parts and the overall forming accuracy, and will not cause mold bulging.

[0054] This utility model provides a precast hollow column combining overlapping and formwork-free construction. It employs a two-sided overlapping and two-sided formwork-free structure. The overlapping surfaces firmly embed the two sides of the column's reinforcing cage into the concrete slab, resulting in a strong and deformation-free overall column. The formwork-free tie rods fully utilize the tie rod system of the column's reinforcing cage, saving significant investment in tie rod components and reducing production costs. Hoisting and temporary construction supports can be easily arranged within the concrete composite slabs on both sides. All molds required for molding are standardized, resulting in high production efficiency and low cost.

[0055] This invention avoids the problems of difficult temporary support arrangement, uncontrollable insertion depth of tie rods, and easy formwork bulging caused by thin formwork in hollow columns without formwork removal, as well as the low stiffness of the column reinforcement cage, easy cracking of the formwork due to overturning, and easy misalignment and grout leakage at the four corners. It also eliminates the need for large centrifugal equipment as required by four-sided stacked hollow columns, and does not affect the load-bearing performance due to the inner wall not being able to effectively overlap with the cast-in-place concrete. It does not require increasing the design size and ensures the effective usable area of ​​the building.

[0056] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A precast hollow column combining stacking and non-removable formwork, characterized in that, It includes a hollow column and a column reinforcement system (3); wherein the hollow column is a cuboid structure with a cavity (12) formed by a composite column plate (1) on side A, a template (10) on side C, a composite column plate (2) on side B and a template (13) on side D in sequence. The column reinforcement system (3) is set in the cavity (12), and one opposite side of the column reinforcement system (3) is embedded in the composite column plate (1) on side A and the composite column plate (2) on side B respectively. The other opposite side of the column reinforcement system (3) is provided with two sets of reinforcing steel mesh, and the two sets of reinforcing steel mesh are embedded in the template (10) on side C and the template (13) on side D respectively.

2. The precast hollow column combining overlapping and non-removable formwork as described in claim 1, characterized in that, The stressed steel mesh includes formwork-free longitudinal bars (6), tie bars (7) and multiple sets of transverse bar assemblies, wherein the multiple sets of transverse bar assemblies are arranged sequentially at intervals along the length direction of the hollow column, and each transverse bar assembly extends along the width direction of the hollow column and its two ends are respectively connected to one opposite side of the column steel reinforcement system (3). The formwork-free longitudinal reinforcement (6) is located on the outside of multiple sets of transverse reinforcement assemblies and is perpendicular to the transverse reinforcement assemblies. The formwork-free longitudinal reinforcement (6) is connected to the column reinforcement system (3) through multiple tie bars (7).

3. The precast hollow column combining overlapping and non-removable formwork as described in claim 2, characterized in that, The horizontal reinforcement assembly includes A-side composite column slab reinforcement bars (4) and B-side composite column slab reinforcement bars (5). The A-side composite column slab reinforcement bars (4) and B-side composite column slab reinforcement bars (5) have the same structure, both being L-shaped structures composed of horizontal and vertical reinforcement bars. The horizontal reinforcement bars of the A-side composite column slab reinforcement bars (4) and B-side composite column slab reinforcement bars (5) are interlocked and fixed. The vertical reinforcement bars of the A-side composite column slab reinforcement bars (4) and B-side composite column slab reinforcement bars (5) are respectively tied and fixed to one opposite side of the column reinforcement system (3).

4. The precast hollow column combining overlapping and non-removable formwork as described in claim 2, characterized in that, There are at least two longitudinal ribs (6) that do not require demolding, and the longitudinal ribs (6) that do not require demolding are tied and fixed to the transverse rib assembly.

5. The precast hollow column combining overlapping and demolding-free construction according to claim 2, characterized in that, The column reinforcement system (3) is a cuboid structure. The column reinforcement system (3) includes multiple main bars arranged in a square and multiple stirrups set outside the multiple main bars. The stirrups are arranged in a ring shape perpendicular to the direction of the main bars and tighten the main bars.

6. The precast hollow column combining overlapping and formwork-free installation according to claim 5, characterized in that, Both ends of the tie bar (7) are provided with tie hooks. The tie hooks at both ends of the tie bar (7) hook the main bar of the column steel reinforcement system (3) and the longitudinal bar (6) that does not require formwork removal, and tie them in place.

7. The precast hollow column combining overlapping and demolding-free construction according to claim 2, characterized in that, The inner side of the D-side non-removable template (13) is provided with an inner lining mold assembly, and an inner lining mold support (11) is provided between the inner lining mold assembly and the column reinforcement system (3).

8. The precast hollow column combining overlapping and formwork-free installation according to claim 7, characterized in that, The inner lining mold assembly includes a middle inner lining mold (8) and two side inner lining molds (9) located on both sides of the middle inner lining mold (8). A through hole is provided between the middle inner lining mold (8) and the two side inner lining molds (9) for the tie bar (7) to pass through.

9. The precast hollow column combining overlapping and formwork-free installation according to claim 8, characterized in that, Both the intermediate inner lining mold (8) and the side inner lining mold (9) are made of steel plate or plastic plate.

10. The precast hollow column combining overlapping and formwork-free construction according to claim 8, characterized in that, The composite column slab (1) on side A, the formwork (10) on side C, the composite column slab (2) on side B, and the formwork (13) on side D are all made of concrete.

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