A hanging formwork structure for a composite floor

Abstract

The utility model relates to a kind of cast-in-place formwork structure of composite floor, belong to the field of construction engineering, the structure includes frame beam, embedded part, prefabricated composite board, hanger, three-section type suspender, formwork, formwork support and cast-in-place slab;The embedded part is set on the upper surface of frame beam;The hanger is set at the gap between adjacent prefabricated composite board, and the both ends of hanger are detachably connected with embedded part;The three-section type suspender includes upper suspender, middle suspender and lower suspender, and detachably connected between upper suspender and lower suspender, between middle suspender and lower suspender, and upper suspender is threadedly connected with hanger, formwork support is threadedly connected with lower suspender, and water stop piece is arranged in middle suspender;The formwork is erected on formwork support, and formwork support is detachably connected with lower suspender.The structure of the utility model need not erect support frame body, saves a large amount of frame body erecting process, improves construction efficiency, and quality safety is double controllable, saves construction period and cost.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering, and in particular relates to a suspended formwork structure for composite floor slabs, which is suitable for the construction of composite floor slabs, especially for high-ceiling floors and other composite floor slab projects where it is inconvenient to erect support frames. Background Technology

[0002] The construction of composite floor slabs usually requires the erection of a support system for the composite slabs and post-cast slabs with formwork. This is especially difficult for high-ceiling floors, as the amount of scaffolding required is large, which is time-consuming and labor-intensive during construction, increasing the construction period and costs.

[0003] Therefore, in order to effectively solve the above problems, a composite floor slab suspended formwork structure and construction method were designed, which eliminates the need to erect a support frame, saves a lot of frame erection procedures, improves construction efficiency, and saves construction time and costs. Utility Model Content

[0004] The purpose of this utility model is to provide a composite floor slab suspended formwork structure to solve the problems of difficulty and large amount of support system construction in traditional high-clearance floors, which are time-consuming and labor-intensive, increasing construction period and cost.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model relates to a suspended formwork structure for composite floor slabs, comprising a frame beam, embedded parts, precast composite slabs, hangers, three-section hangers, formwork, formwork supports, and cast-in-place slabs. The embedded parts are disposed on the upper surface of the frame beam. The precast composite slabs are supported at both ends on the frame beam, with gaps between adjacent slabs. The hangers are disposed in the gaps between adjacent slabs, with both ends detachably connected to the embedded parts via plastic sleeves. The three-section hangers include an upper hanger, a middle hanger, and a lower hanger. The upper and lower hangers, as well as the middle and lower hangers, are detachably connected by threads. The upper hanger is threaded to the hanger, and the formwork support is threaded to the lower hanger. A water-stop plate is provided in the middle of the middle hanger. The formwork is erected on the formwork support, which is detachably connected to the lower hanger, thus sealing the lower opening of the gap between adjacent precast composite slabs. The cast-in-place slabs are poured into the gaps between the precast composite slabs and onto the upper surface of the composite slabs.

[0007] Preferably, the template support includes horizontal ribs and variable cross-section longitudinal ribs, with the variable cross-section longitudinal ribs spaced apart and erected on the horizontal ribs, and the bottom of the horizontal ribs connected to the external thread of the bottom end of the lower hanger by a nut B.

[0008] Preferably, the middle part of the variable cross-section longitudinal rib is a groove formed by a smaller cross-section, and the template is placed in the groove.

[0009] Preferably, the hanger includes a hanger column, a hanger longitudinal beam, and a hanger transverse beam. The hanger longitudinal beam is provided with a lifting hole, and the upper hanging rod passes through the lifting hole and is connected to the hanger longitudinal beam through a nut B.

[0010] Preferably, the embedded parts include positioning piles, steel plates, and reinforcing bar legs. The reinforcing bar legs are welded to the bottom surface of the steel plate, and the positioning piles are welded to the top surface. The reinforcing bar legs are welded and fixed to the reinforcing bars of the frame beam, and the positioning piles are exposed outside the frame beam. The hanger columns at both ends of the hanger are supported on the frame beam, and a sealing sleeve is provided on the outer periphery of the positioning pile. The bottom of the hanger columns at both ends of the hanger is provided with a plastic sleeve with an inner diameter matching the sealing sleeve. The plastic sleeve is fitted outside the sealing sleeve so that the hanger column and the corresponding positioning pile can be detachably connected.

[0011] Preferably, the height of the plastic sleeve is higher than the elevation of the cast-in-place slab.

[0012] Preferably, the upper and lower suspension rods, and the middle and lower suspension rods are connected by a nut A, and the nut A is covered with a conical plastic sleeve.

[0013] This utility model has the following features and beneficial effects:

[0014] This utility model relates to a precast composite slab formwork structure that uses a hanger and a three-section suspension rod to suspend the formwork support and formwork. The two ends of the hanger are detachably connected to embedded parts set on the frame beams via plastic sleeves. The formwork is erected on the formwork support, which is detachably connected to the lower suspension rod of the three-section suspension rod. This eliminates the need for a support frame, saving a significant amount of scaffolding erection work, improving construction efficiency, and saving time and costs. Most construction processes can be performed on the installed precast composite slabs and frame beams, eliminating numerous high-altitude operations and ensuring high safety.

[0015] In the composite floor slab formwork structure of this utility model, the formwork support includes horizontal ribs and variable cross-section longitudinal ribs. The variable cross-section longitudinal ribs are spaced apart and erected on the horizontal ribs. The middle of the variable cross-section longitudinal ribs is a groove formed by a smaller cross-section. The formwork is placed in the groove. The bottom of the cast-in-place slab adopts a special design of variable cross-section ribs to ensure that the formwork of the precast composite slab and the cast-in-place slab are at the same elevation, ensuring that the overall stress of the hanging structure is uniform and the safety is high. In addition, the variable cross-section ribs can provide positioning and fixing function for the formwork, which facilitates the installation of the formwork.

[0016] In the composite floor slab suspended formwork structure involved in this utility model, the hangers, three-section hangers and accessories used can all be reused, saving costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the elevation of the composite floor slab suspended formwork structure;

[0018] Figure 2 This is a schematic diagram of the hanger structure;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the three-section suspension rod;

[0020] Figure 4 This is a schematic diagram of the structural elevation of the embedded parts;

[0021] Figure 5 This is a schematic diagram of the longitudinal rib elevation with variable cross-section;

[0022] Figure 6 This is a top view after the embedded parts have been installed;

[0023] Figure 7 yes Figure 6 Schematic diagram of AA section;

[0024] Figure 8 This is a top view of the precast composite slab after installation;

[0025] Figure 9 yes Figure 8 Schematic diagram of the BB cross section;

[0026] Figure 10 This is a top view after the hanger is installed;

[0027] Figure 11 yes Figure 10 A schematic diagram of the CC section;

[0028] Figure 12 This is a top view after the formwork installation and concrete pouring are completed;

[0029] Figure 13 yes Figure 12 Schematic diagram of the DD cross section;

[0030] Figure 14 yes Figure 12 A schematic diagram of the EE cross section.

[0031] In the diagram: 1. Frame beam, 2. Embedded parts, 21. Positioning pile, 22. Steel plate, 23. Reinforcing bar leg, 3. Precast composite slab, 4. Hanger, 41. Hanger column, 42. Hanger longitudinal beam, 43. Hanger crossbeam, 44. Lifting hole, 5. Three-section hanger rod, 51. Upper hanger rod, 52. Middle hanger rod, 53. Lower hanger rod, 54. Conical plastic sleeve, 55. Nut A, 56. Nut B, 57. Waterstop plate, 6. Formwork, 7. Horizontal rib, 8. Variable cross-section longitudinal rib, 9. Plastic sleeve, 10. Sealing sleeve, 11. Cast-in-place slab. Detailed Implementation

[0032] This embodiment uses a frame structure where the frame beams and columns are constructed first, followed by the floor slab construction. The above-ground floor slab system is a composite floor slab, consisting of a 60mm precast slab and a 70mm cast-in-place slab. The standard length of the precast slab is 3000mm, and the width is 1600mm. The width of the cast-in-place portion between the precast slabs is 500mm. The composite floor slab construction employs a composite floor slab suspended formwork structure and construction method disclosed in this utility model. The following embodiments are explanations of this utility model and are not limited to these embodiments.

[0033] See attached document Figure 1 As shown, the composite floor slab formwork structure of this utility model includes a frame beam 1, embedded parts 2, precast composite slabs 3, hangers 4, three-section hangers 5, formwork 6, formwork supports, and cast-in-place slabs 11. The precast composite slabs 3 are supported on the frame beams 1 at both ends, and there are gaps between adjacent precast composite slabs 3.

[0034] The embedded part 2 is set on the upper surface of the frame beam 1, as shown in the figure. Figure 4 As shown, the embedded part 2 includes a positioning pile 21, a steel plate 22, and a reinforcing bar support leg 23. The reinforcing bar support leg 23 is welded to the bottom surface of the steel plate 22, and the positioning pile 21 is welded to the top surface. The reinforcing bar support leg 23 is welded and fixed to the reinforcing bar of the frame beam 1 to ensure the connection strength between the embedded part 2 and the frame beam 1. The steel plate 22 is kept horizontal and the bottom surface of the steel plate 22 is flush with the elevation of the frame beam 1. The positioning pile 21 is exposed outside the frame beam 1 and is used to connect the hanger 4.

[0035] The hanger 4 is installed in the gap between adjacent precast composite slabs 3, and both ends of the hanger 4 are detachably connected to the embedded part 2 through plastic sleeves 9; the specific structure of the hanger 4 is as follows Figure 2 As shown, it includes a hanger column 41, a hanger longitudinal beam 42, and a hanger cross beam 43, with a hanger longitudinal beam 42 having a lifting hole 44; combined with the attached... Figure 1 As shown, the hanger columns 41 at both ends of the hanger 4 are supported on the frame beam 1. Sealing sleeves 10 are installed around the outer periphery of the positioning piles 21. Plastic sleeves 9 with inner diameters matching the sealing sleeves 10 are provided at the bottom of the hanger columns 41 at both ends of the hanger 4. The plastic sleeves 9 are fitted over the sealing sleeves 10, allowing the hanger columns 41 and the corresponding positioning piles 21 to be detachably connected. The height of the plastic sleeves 9 is higher than the elevation of the cast-in-place slab 11 to prevent cast-in-place concrete from entering the plastic sleeves 9 and causing the hanger columns 41 to become inseparable from the embedded parts 2 later.

[0036] See attached document Figure 3As shown, the three-section suspension rod 5 includes an upper suspension rod 51, a middle suspension rod 52, and a lower suspension rod 53. The upper suspension rod 51 and the lower suspension rod 53, as well as the middle suspension rod 52 and the lower suspension rod 53, are detachably connected by threaded connections. Specifically, they are connected to each other by nuts A55, and a conical plastic sleeve 54 is fitted over the nut A55. When cast-in-place concrete comes into contact with the nut A55, the nut A55 cannot move due to the solidification of the concrete. The upper suspension rod 51 passes through the suspension hole 44 and is connected to the longitudinal beam 42 of the suspension frame through a nut B56. The formwork support and the lower suspension rod 53 are threadedly connected by a nut B56. A water-stop plate 57 is provided in the middle of the middle suspension rod 52.

[0037] The template 6 is erected on the template support, and the template support is detachably connected to the lower suspension rod 53, so that the template 6 seals the lower opening of the gap between adjacent precast composite slabs 3; the structure of the template support is as follows: Figure 1 and Figure 5 As shown, it includes horizontal ribs 7 and variable cross-section longitudinal ribs 8. The variable cross-section longitudinal ribs 8 are spaced apart and erected on the horizontal ribs 7. The bottom of the horizontal ribs 7 is connected to the bottom of the lower hanger 53 by the external thread of the nut B56. The middle part of the variable cross-section longitudinal rib 8 is a groove formed by a smaller cross-section, and the template 6 is placed in the groove.

[0038] The construction method for the above-mentioned composite floor slab suspended formwork structure is characterized by including the following steps:

[0039] S1. Construction frame beam 1, refer to the appendix. Figure 6 and 7 As shown, during construction, embedded parts 2 are set in advance. After the reinforcement of frame beam 1 is tied, the installation position of embedded parts 2 is measured and marked according to the installation position of precast composite slab 3. The reinforcement legs 23 at the bottom of embedded parts 2 are welded and fixed to the reinforcement of frame beam 1. When fixing, it is necessary to ensure that the flatness and elevation of embedded parts 2 meet the design requirements. After all embedded parts 2 are installed, the concrete of frame beam 1 can be poured. During the vibration process, avoid direct contact between the vibrator and embedded parts 2.

[0040] S2. Installation of precast composite slabs: Refer to Appendix Figure 8 and 9 As shown, after the concrete strength of the frame beam 1 reaches the design requirements, the placement position of the precast composite slab 3 is measured and laid out. The precast composite slab 3 is hoisted piece by piece, and the two ends of the precast composite slab 3 are supported on the frame beam 1. The steel bars of the cast-in-place slab 11 are tied.

[0041] S3. Assembly of three-section hangers 5: Calculate the number of three-section hangers 5 according to the design requirements. Upon arrival, check the appearance quality, the specifications and dimensions of the waterstop 57, the welding quality, and whether the three-section connection is normal. Pay special attention to the deviation between the width of the middle hanger 52 after connecting the conical plastic sleeves 54 at both ends and the thickness of the floor slab. Weld the waterstop 57 in the middle position of the middle hanger 52. Then connect the upper hanger 51 and the lower hanger 53 by threaded connection, and connect the middle hanger 52 and the lower hanger 53 by threaded connection to form the three-section hanger 5 as a whole.

[0042] S4. Installation of hanger 4 and three-section hanger 5: (e.g.) Figure 10 and 11 As shown, the hanger 4 is set in the gap between adjacent precast composite slabs 3, and its two ends are detachably connected to the embedded parts 2 through plastic sleeves 9; the upper hanger 51 is attached to the hanger 4, so that the three-section hanger 5 is detachably installed on the hanger 4. Specifically, firstly, the debris around the exposed positioning pile 21 of the embedded parts 2 is cleaned up, and a sealing sleeve 10 is put on the outside of the positioning pile 21; then, the plastic sleeve 9 is put on the bottom of the hanger column 41, and the upper part of the three-section hanger 5 is pre-fixed to the hanger longitudinal beam 42 through the nut B56; finally, the two ends of the hanger 4 are supported on the frame beam 1 through the hanger column 41 and fixed through the positioning pile 21.

[0043] S5. Template Installation: Combined with Figures 12-14 As shown, the template 6 is erected on the template support. The template support is detachably connected to the lower hanger 53, so that the template 6 seals the lower opening of the gap between adjacent precast composite slabs 3. Specifically, according to the longitudinal and transverse arrangement of the three-section hanger 5, the layout is laid out and lines are drawn on the template 6, the transverse rib 7 and the variable cross-section longitudinal rib 8, and hanger holes are drilled. The template 6, the variable cross-section longitudinal rib 8 and the transverse rib 7 are installed in sequence to ensure that the conical plastic sleeve 54 fits tightly with the inner side of the template 6. Nut B56 is used for fixing, and a torque wrench is used to check the tightness.

[0044] S6. Construction of cast-in-place slab 11: After the installation and reinforcement of the hanger structure have passed the acceptance inspection, the concrete pouring of cast-in-place slab 11 shall be carried out. During the vibration process, avoid direct contact between the vibrator and the three-section hanger 5, the hanger 4 and the plastic sleeve 9.

[0045] S7. Removal of Formwork 6: After the cast-in-place slab 11 concrete has reached its design strength, remove the formwork support, formwork 6, lower hanger 53, and upper hanger 51 in sequence, leaving the middle hanger 52 intact. First, use a wrench to loosen the nuts B56 of the lower hanger 53 and upper hanger 51, then remove the horizontal rib 7, variable cross-section longitudinal rib 8, and formwork 6 in sequence, removing the lower hanger 53 and upper hanger 51. Next, use a special wrench to remove the nuts A55 and conical plastic sleeve 54. Clean the removed upper hanger 51, lower hanger 53, conical plastic sleeve 54, and nut A55 promptly, apply lubricant, and prepare for reuse.

[0046] S8. Removal of hanger 4: Lift hanger 4 upwards as a whole, so that hanger column 41 is pulled out of the floor. Use special tools to recover plastic sleeve 9 and sealing sleeve 10, maintain hanger and reuse it.

[0047] S9. Hole sealing: For the holes formed in the cast-in-place slab 11 when the upper hanger 51 and hanger 4 are removed, clean the floating dust and debris in the hole, rinse it with water, fill it with micro-expansion polymer cement mortar and compact it, then smooth and compact it, and apply two layers of polyurethane waterproof coating around the hole for reinforcement.

[0048] The present invention has been described in detail above with reference to the embodiments. However, the description is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A suspended formwork structure for composite floor slabs, characterized in that: It includes a frame beam (1), embedded parts (2), precast composite slabs (3), hangers (4), three-section hangers (5), formwork (6), formwork supports, and cast-in-place slabs (11); the embedded parts (2) are set on the upper surface of the frame beam (1); the two ends of the precast composite slabs (3) are erected on the frame beam (1), and there is a gap between adjacent precast composite slabs (3); the hangers (4) are set in the gap between adjacent precast composite slabs (3), and the two ends of the hangers (4) are detachably connected to the embedded parts (2) through plastic sleeves (9); the three-section hangers (5) include an upper hanger (51), a middle hanger (52), and a lower hanger (53). The upper and lower hanging rods (51) and the middle and lower hanging rods (53) are detachably connected by threaded connections. The upper hanging rod (51) is threaded to the hanger (4), the template support is threaded to the lower hanging rod (53), and the middle hanging rod (52) is provided with a water-stop plate (57). The template (6) is erected on the template support, and the template support is detachably connected to the lower hanging rod (53), so that the template (6) seals the lower opening of the gap between adjacent precast composite slabs (3). The cast-in-place slab (11) is poured into the gap between the precast composite slabs (3) and the upper surface of the composite slab (3).

2. The composite floor slab suspended formwork structure according to claim 1, characterized in that: The template support includes horizontal ribs (7) and variable cross-section longitudinal ribs (8). The variable cross-section longitudinal ribs (8) are spaced apart and erected on the horizontal ribs (7). The bottom of the horizontal ribs (7) is connected to the external thread of the bottom end of the lower hanger (53) through nuts B (56).

3. The composite floor slab suspended formwork structure according to claim 2, characterized in that: The variable cross-section longitudinal rib (8) has a groove in the middle formed by the smaller cross-section, and the template (6) is set in the groove.

4. The composite floor slab suspended formwork structure according to claim 1, characterized in that: The hanger (4) includes a hanger column (41), a hanger longitudinal beam (42) and a hanger cross beam (43). The hanger longitudinal beam (42) is provided with a lifting hole (44). The upper hanging rod (51) passes through the lifting hole (44) and is connected to the hanger longitudinal beam (42) through a nut B (56).

5. The composite floor slab suspended formwork structure according to claim 4, characterized in that: The embedded part (2) includes a positioning pile (21), a steel plate (22) and a steel bar support (23). The steel bar support (23) is welded to the bottom surface of the steel plate (22) and the positioning pile (21) is welded to the top surface. The steel bar support (23) is welded and fixed to the steel bars of the frame beam (1). The positioning pile (21) is exposed outside the frame beam (1). The hanger columns (41) at both ends of the hanger (4) are supported on the frame beam (1). The positioning pile (21) is provided with a sealing sleeve (10) on the outer periphery. The bottom of the hanger columns (41) at both ends of the hanger (4) is provided with a plastic sleeve (9) with an inner diameter matching the sealing sleeve (10). The plastic sleeve (9) is fitted outside the sealing sleeve (10) so that the hanger column (41) and the corresponding positioning pile (21) can be detachably connected.

6. The composite floor slab suspended formwork structure according to claim 5, characterized in that: The height of the plastic sleeve (9) is higher than the elevation of the cast-in-place slab (11).

7. The composite floor slab suspended formwork structure according to claim 1, characterized in that: The upper rod (51) and the lower rod (53), and the middle rod (52) and the lower rod (53) are connected by a nut A (55), and a conical plastic sleeve (54) is fitted over the nut A (55).

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