Large-span prefabricated stair post-cast strip formwork system

Abstract

The utility model discloses a large-span prefabricated stair post-cast strip formwork system which comprises an upper formwork assembly and a lower formwork assembly which are arranged at the joint of a prefabricated stair and used for forming a post-cast strip, and the upper formwork assembly and the lower formwork assembly are connected through a split screw penetrating through the upper formwork assembly and the lower formwork assembly and clamp and fix the prefabricated stair at the joint of the prefabricated stair. The upper mold assembly comprises a step mold plate arranged at the stair section of the prefabricated stair, and the width of the step mold plate can be adjusted to adapt to the step width of the prefabricated stair. According to the large-span prefabricated stair post-cast strip formwork system, the problems that solidification is waited, abutted seams leak slurry, the surface is uneven and the apparent quality is poor in an original post-cast strip pouring construction mode are solved, the construction difficulty is reduced, and the large-span prefabricated stair post-cast strip formwork system has the advantages of being easy and convenient to construct, reliable in quality, environmentally friendly, obvious in economic benefit and good in application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a formwork system for a post-casting strip of a large-span prefabricated staircase. Background Art

[0002] Prefabricated buildings are buildings assembled on site using building components prefabricated in factories. The development of prefabricated buildings is a major change in construction methods and an important measure to promote supply-side structural reform and new urbanization development. It is conducive to saving resources and energy, reducing construction pollution, improving labor productivity and quality and safety levels, and promoting the deep integration of the construction industry and information industrialization, cultivating new industries and new momentum, and promoting the resolution of overcapacity.

[0003] In the prior art, when constructing prefabricated staircases in schools or factories, due to the large span and overall weight exceeding the lifting weight of a tower crane, in order to save the expensive rental of a large-capacity tower crane, the prefabricated staircase is usually redesigned and divided into two sections for lifting, with a reserved location for the post-casting strip. After the two prefabricated staircases are installed, the post-casting strip is constructed between the two prefabricated staircases. However, during the post-casting strip construction, a wooden formwork is often used at the bottom, while a hanging formwork is used at the top. However, traditional hanging formwork for stairs is difficult to control the slump of concrete during the pouring process, and a considerable amount of time is wasted while waiting for the concrete strength to solidify. Furthermore, the hanging formwork for stairs is prone to bulging during construction, and excessive slump prevents the concrete from flowing completely to the bottom after forming and vibration. Furthermore, the use of wooden formwork at the bottom of the formwork system can easily lead to joint leakage at the bottom of the stairs and damage after demoulding after pouring. The stair treads are also prone to unevenness, requiring a large amount of manual work for subsequent polishing.

[0004] Therefore, it is necessary to improve the traditional large-span prefabricated staircase post-casting formwork system so that it can avoid and improve the above-mentioned defects. Utility Model Content

[0005] In view of this, the present application provides a large-span prefabricated staircase post-casting joint formwork system, which solves the problems of waiting for solidification, leakage of joints, uneven surface, and poor appearance quality in the original construction method of post-casting joints, reduces the construction difficulty, and has the advantages of simple construction, reliable quality, green environmental protection, obvious economic benefits, and good application prospects.

[0006] The utility model provides a formwork system for a post-cast strip of a large-span prefabricated staircase, comprising an upper mold assembly and a lower mold assembly which are arranged at the joints of the prefabricated staircase and used to form the post-cast strips. The upper mold assembly and the lower mold assembly are connected by a tension screw rod running through the two and clamp the prefabricated staircase at the joints of the prefabricated staircase. The upper mold assembly comprises a tread template arranged at the stair section of the prefabricated staircase, and the width of the tread template is adjustable to adapt to the tread width of the prefabricated staircase.

[0007] Furthermore, the upper mold assembly includes a first upper mold plate arranged on the upper surface of the prefabricated staircase upper platform, a second upper mold plate arranged on the upper surface of the prefabricated staircase lower platform, and the step mold plate is arranged between the first upper mold plate and the second upper mold plate;

[0008] The lower mold assembly includes a first lower mold plate arranged on the lower surface of the prefabricated stair upper platform, a second lower mold plate arranged on the lower surface of the prefabricated stair lower platform, and a third lower mold plate arranged between the first lower mold plate and the second lower mold plate and located below the step mold plate.

[0009] Furthermore, the step template includes a number of step template units arranged on the prefabricated stair treads. The step template unit has a C-shaped structure as a whole and includes an upper horizontal plate, a lower horizontal plate and a connecting vertical plate for connecting the upper horizontal plate and the lower horizontal plate. The lower horizontal plate is arranged on the horizontal plane of the prefabricated stair treads, and the connecting vertical plate is arranged on the vertical plane of the prefabricated stair treads. The adjacent step template units are connected and fastened by fasteners penetrating the lower horizontal plate of the upper step template unit and the upper horizontal plate of the lower step template unit.

[0010] Furthermore, the upper transverse plate and the lower transverse plate are both provided with strip-shaped adjustment holes in the step width direction, and the strip-shaped adjustment holes are used for adjusting the positions of adjacent step template units to adapt to the step width of the prefabricated staircase.

[0011] Furthermore, the end of the first upper template close to the prefabricated stair tread section is connected to the upper horizontal plate of the step template unit located at the highest point in the vertical direction by fasteners, and the end of the second upper template close to the prefabricated stair tread section is also a C-shaped structure and the upper horizontal plate is connected to the lower horizontal plate of the step template unit located at the lowest point in the vertical direction by fasteners.

[0012] Furthermore, it also includes an attached vibration device for vibrating the concrete entering the mold, and the first upper template, the second upper template and the lower transverse plate of the step template unit are all provided with mounting brackets for installing the attached vibration device.

[0013] Furthermore, the lower horizontal plate is provided with mortar outlet holes at the positive corners of the prefabricated stair treads.

[0014] Furthermore, the third lower formwork includes a plurality of lower formwork units obliquely arranged on the bottom surface of the prefabricated stair tread segment, and the plurality of lower formwork units are evenly distributed along the length direction of the bottom surface of the prefabricated stair tread segment and connected to each other by fasteners.

[0015] Furthermore, the first lower formwork and the second lower formwork have the same structure and are respectively used to support the lower surface of the prefabricated stair upper platform and the lower surface of the prefabricated stair lower platform. The end of the first lower formwork close to the prefabricated stair tread section is connected to the end of the lower formwork unit located at the highest point in the vertical direction through fasteners, and the end of the second lower formwork close to the prefabricated stair tread section is connected to the end of the lower formwork unit located at the lowest point in the vertical direction through fasteners.

[0016] Furthermore, a support rod assembly is provided between the lower mold assembly and the construction floor, and the support rod assembly is used to support the formwork system.

[0017] In summary, the present application includes at least one of the following beneficial effects: the large-span prefabricated staircase post-casting strip formwork system of the present invention can be arbitrarily adjusted according to the designed stair tread width through the tool-type stair formwork, is easy to disassemble after pouring, and can be reused many times, reducing costs; at the same time, the formwork system can make the post-casting strip concrete poured in place at one time, greatly reducing the time required to wait for the lower concrete to reach a certain strength before pouring the upper part due to poor adjustment of the concrete slump; slurry holes are also provided at the positive corners of the post-casting strip to prevent the formation of air bubble space and the resulting chipping of edges and corners; the formwork system is also provided with an installation structure with a built-in attached vibrator to ensure uniform vibration of the concrete at various positions of the post-casting strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the formwork system for the post-cast strip of a large-span prefabricated staircase in the present invention;

[0020] Figure 2 This is a bottom view of the structure of the formwork system for the post-cast strip of the large-span prefabricated staircase in the present invention;

[0021] Figure 3 This is a structural diagram of the step template unit in the utility model;

[0022] Figure 4 This is a structural cross-sectional view of the formwork system for the post-cast strip of a large-span prefabricated staircase in the present invention;

[0023] Explanation of the accompanying drawings: 1-prefabricated upper platform of stairs; 2-prefabricated lower platform of stairs; 3-prefabricated stair tread section; 4-first upper formwork; 5-second upper formwork; 6-tread formwork unit; 7-first lower formwork; 8-second lower formwork; 9-lower formwork unit; 10-support rod assembly; 11-tension screw; 12-fastener; 13-attached vibration device; 601-upper horizontal plate; 602-lower horizontal plate; 603-connecting vertical plate; 604-strip adjustment hole; 605 mounting bracket; 606-edging structure. DETAILED DESCRIPTION

[0024] The utility model provides a formwork system for post-cast strips of large-span prefabricated stairs, comprising an upper mold assembly and a lower mold assembly arranged at the joints of the prefabricated stairs and used to form post-cast strips, and a support rod assembly arranged between the lower mold assembly and the construction floor. The upper mold assembly and the lower mold assembly are connected by a tension screw 11 passing through the upper mold assembly and the lower mold assembly, and the prefabricated stairs are clamped and fixed at the joints of the prefabricated stairs. The support rod assembly 10 is used to support the formwork system;

[0025] The upper mold assembly includes a first upper mold plate 4 provided on the surface of the upper platform 1 of the prefabricated staircase, a second upper mold plate 5 provided on the upper surface of the lower platform 2 of the prefabricated staircase, and a step mold plate provided between the first upper mold plate 4 and the second upper mold plate 5. The width of the step mold plate is adjustable to adapt to the step width of the prefabricated staircase;

[0026] The lower mold assembly includes a first lower mold plate 7 provided on the lower surface of the prefabricated stair upper platform 1, a second lower mold plate 8 provided on the lower surface of the prefabricated stair lower platform 2, and a third lower mold plate provided between the first lower mold plate 7 and the second lower mold plate 8 and located below the step mold plate;

[0027] The upper mold assembly and the lower mold assembly can be made of aluminum material in one piece, and can be connected by fasteners when in use. Compared with traditional wooden formwork, it is more convenient to disassemble and the connection is more stable, not prone to leakage. It can also be reused, which reduces costs; the upper mold assembly is mainly arranged at the upper surface of the post-casting strip, and the lower mold assembly is arranged at the lower surface of the post-casting strip. The two are connected by a tension screw 11 and clamp the prefabricated stairs at the left and right ends and adjust them to be flush, ensuring the quality of subsequent concrete pouring; a support rod assembly 10 supported on the installation floor is provided below the lower mold assembly to support the entire formwork structure and ensure the strength of the formwork; the upper mold assembly includes a tread formwork arranged on the prefabricated stair step section 3 to shape the stair tread section at the post-casting strip during pouring, and the tread formwork can be adjusted according to the precast concrete pouring conditions. The tread width on the designed stair tread section 3 is adjusted to obtain a tread structure with the same size as the tread on the prefabricated stair tread section 3; by improving the existing large-span prefabricated stair post-casting strip formwork structure, the tread formwork can be adjusted at will according to the designed stair tread width, and it is easy to disassemble after pouring and can be reused many times, reducing costs; at the same time, the formwork system can make the post-casting strip concrete poured in place at one time, greatly reducing the time required to wait for the lower concrete to reach a certain strength before pouring the upper part due to poor adjustment of the concrete slump; it solves the problems of waiting for solidification, leakage of joints, uneven surface, and poor appearance quality in the original method of post-casting strip pouring construction, reduces the construction difficulty, has the advantages of simple construction, reliable quality, green and environmental protection, obvious economic benefits, and good application prospects.

[0028] In this embodiment, the step template includes a plurality of step template units 6 arranged on the prefabricated stair treads. The step template unit 6 is a C-shaped structure as a whole and includes an upper horizontal plate 601, a lower horizontal plate 602 and a connecting vertical plate 603 for connecting the upper horizontal plate 601 and the lower horizontal plate 602. The lower horizontal plate 602 is arranged on the horizontal plane of the prefabricated stair treads, and the connecting vertical plate 603 is arranged on the vertical plane of the prefabricated stair treads. The adjacent step template units 6 are connected and fastened by fasteners 12 that penetrate the lower horizontal plate 602 of the upper step template unit and the upper horizontal plate 601 of the lower step template unit; combined with Figure 1 and Figure 3As shown, the fastener 12 is a connecting bolt structure (the same below), and the step template has a plurality of step template units 6 formed by splicing the steps on the prefabricated stair tread section and respectively connected to the first upper template 4 and the second upper template 5 to form an upper template assembly as a whole; wherein the step template unit 6 is a C-shaped structure as a whole and includes an upper horizontal plate 601, a lower horizontal plate 602 and a connecting vertical plate 603 for connecting the upper horizontal plate 601 and the lower horizontal plate 602, the lower horizontal plate 602 is arranged on the horizontal plane of the prefabricated stair tread, and the connecting vertical plate 603 is arranged on the vertical plane of the adjacent prefabricated stair treads above, that is, at the inner corner between the stair treads, the lower horizontal plate 602 is longer in overall length than the upper horizontal plate 601, and can be overlapped on the upper horizontal plate 601 of the step template unit 6 located below, and the overlapping part is connected and fixed by the fastener 12.

[0029] In this embodiment, the upper horizontal plate 601 and the lower horizontal plate 602 are both provided with strip-shaped adjustment holes 604 in the step width direction, and the strip-shaped adjustment holes 604 are used to adjust the position of the adjacent step template units 6 to adapt to the step width of the prefabricated stairs; Figure 1 and Figure 3 As shown, in order to enable the adjacent step template unit 6 to be adjusted to the designed step width size, strip adjustment holes 604 are respectively opened on the upper cross plate 601 and the lower cross plate 602 in the step width direction, and the strip adjustment holes are used in conjunction with fasteners 12 to achieve connection and fixation at the designed step width size.

[0030] In this embodiment, the end of the first upper template 4 close to the prefabricated stair tread section is connected to the upper horizontal plate 601 of the step template unit 6 located at the highest point in the vertical direction by a fastener 12, and the end of the second upper template 5 close to the prefabricated stair tread section is also a C-shaped structure, and the upper horizontal plate is connected to the lower horizontal plate 602 of the step template unit 6 located at the lowest point in the vertical direction by a fastener 12; Figure 1 and Figure 4 As shown, affected by the structure of the step formwork unit 6, there is a difference in the structure of the first upper formwork 4 and the second upper formwork 5. The first upper formwork 4 is a flat plate structure as a whole, and is connected to the upper horizontal plate 601 of the step formwork unit 6 located at the highest point in the vertical direction at the end near the prefabricated stair tread section by fasteners 12; while the end of the second upper formwork 5 near the prefabricated stair tread section is the same C-shaped structure as the step formwork unit 6, and the upper horizontal plate is connected to the lower horizontal plate 602 of the step formwork unit 6 located at the lowest point in the vertical direction by fasteners 12.

[0031] In this embodiment, an attached vibration device 13 for vibrating the concrete entering the mold is also included. The first upper formwork 4, the second upper formwork 5 and the lower horizontal plate 602 of the step formwork unit 6 are all provided with a mounting bracket 605 for installing the attached vibration device; in order to eliminate the gas mixed in the concrete after the post-cast strip concrete is entered into the mold and make the concrete filled more compactly in the formwork, the attached vibration device 13 is used to fully and evenly vibrate the concrete entering the mold; at the same time, the first upper formwork 4, the second upper formwork 5 and the lower horizontal plate 602 of the step formwork unit 6 are all provided with a mounting bracket 605 for installing the attached vibration device, which makes the installation of the attached vibration device 13 more convenient, and the attached vibration device 13 and the mounting bracket 605 are also connected by a fastener 12.

[0032] In this embodiment, the lower horizontal plate 602 is further provided with a slurry outlet hole at the positive corner of the prefabricated stair tread; by providing a slurry outlet hole at the positive corner of the prefabricated stair tread at the positive corner of the post-cast strip, it is prevented that air bubbles are formed at the positive corner of the tread during the concrete pouring process and cannot be discharged, which leads to chipping of edges and corners at the positive corner after the concrete solidifies.

[0033] In this embodiment, the third lower template includes a plurality of lower template units 9 arranged obliquely on the bottom surface of the prefabricated stair tread segment, and the plurality of lower template units 9 are evenly distributed along the length direction of the bottom surface of the prefabricated stair tread segment and connected to each other by fasteners 12; Figure 2 and Figure 4 As shown, the third lower formwork is formed by connecting a plurality of lower formwork units 9 which are arranged obliquely along the bottom surface of the prefabricated stair tread segment. By using a plurality of lower formwork units 9 for splicing, the installation and transportation of the third lower formwork can be facilitated, and the inclination angle of the bottom surface of the prefabricated stair tread segment can be adjusted according to design requirements. The tension screws 11 can also be provided between the lower formwork unit 9 and the tread formwork unit 6 as required to ensure the molding quality of the prefabricated stair tread segment.

[0034] In this embodiment, the first lower template 7 and the second lower template 8 have the same structure and are respectively used to support the lower surface of the prefabricated stair upper platform 1 and the lower surface of the prefabricated stair lower platform 2. The end of the first lower template 7 close to the prefabricated stair tread section is connected to the end of the lower template unit 9 located at the highest point in the vertical direction through a fastener 12. The end of the second lower template 8 close to the prefabricated stair tread section is connected to the end of the lower template unit 9 located at the lowest point in the vertical direction through a fastener 12. Figure 2 and Figure 4 As shown, the first lower template 7 and the second lower template 8 are templates of the same structure, and are respectively connected to the two ends of the third lower template through fasteners 12.

[0035] In this embodiment, the upper mold assembly and the lower mold assembly are both provided with a rim structure 606 for strengthening the strength of the template, and a reinforcing rib is further provided between the rim structure 606 and the bottom surface of the template; Figures 1 to 3 As shown, the circumferential edges of the first lower template 7, the second lower template 8, the lower template unit 9, the first upper template 4, the second upper template 5 and the step template unit 6 are all provided with edging structures, and reinforcing ribs are provided between the edging structure and the bottom of the template to ensure the self-strength of the above-mentioned templates. At the same time, for the first lower template 7, the second lower template 8 and the lower template unit 9, the connection between adjacent templates can also be achieved by cooperating with the edging structure and the fasteners 12.

[0036] This embodiment also mentions a construction method for a large-span prefabricated staircase post-casting strip formwork system, which is applicable to the large-span prefabricated staircase post-casting strip formwork system described above, and includes the following steps:

[0037] S1. Hoist the prefabricated staircase to the installation location and install it, leaving a gap for post-casting between two adjacent prefabricated staircases;

[0038] S2. Assemble the lower mold assembly and hoist it to the prefabricated stair joints, and set up support rod assembly 10 below the lower mold assembly for support;

[0039] S3. Install the upper formwork assembly at the joints of the prefabricated stairs, wherein the first upper formwork 4 and the second upper formwork 5 located on the upper and lower platforms of the prefabricated stairs are first installed, and then the step formwork unit 6 is installed between the first upper formwork 4 and the second upper formwork 5 according to the preset step width, and finally the post-casting strip formwork at the joints of the prefabricated stairs is formed.

[0040] S4. Check the formwork strength and quality of the formwork structure. After confirming that they are correct, pour concrete from the post-cast strip of the prefabricated stair upper platform so that the concrete flows to the prefabricated stair upper platform. After pouring, use the attached vibration device 13 to evenly vibrate the concrete in the post-cast strip template.

[0041] S5. After the concrete in the post-cast strip formwork solidifies, the formwork is removed and the molding quality of the post-cast strip is checked. Polishing is performed based on the molding quality.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A formwork system for post-cast strips of large-span prefabricated stairs, characterized by: The upper mold assembly and the lower mold assembly are provided at the joint of the prefabricated staircase and used to form the post-casting strip. The upper mold assembly and the lower mold assembly are connected by a tension screw running through the upper mold assembly and clamp the prefabricated staircase at the joint of the prefabricated staircase. The upper mold assembly includes a tread template provided at the staircase of the prefabricated staircase. The width of the tread template is adjustable to adapt to the width of the tread of the prefabricated staircase. The upper mold assembly includes a first upper mold plate arranged on the upper surface of the prefabricated staircase platform, and a second upper mold plate arranged on the upper surface of the prefabricated staircase platform, and the step mold plate is arranged between the first upper mold plate and the second upper mold plate; The lower mold assembly includes a first lower mold plate arranged on the lower surface of the prefabricated stair upper platform, a second lower mold plate arranged on the lower surface of the prefabricated stair lower platform, and a third lower mold plate arranged between the first lower mold plate and the second lower mold plate and located below the step mold plate.

2. The post-casting formwork system for large-span prefabricated staircases according to claim 1 is characterized in that: The tread template includes several tread template units arranged on the prefabricated stair treads. The tread template unit has a C-shaped structure as a whole and includes an upper horizontal plate, a lower horizontal plate and a connecting vertical plate for connecting the upper horizontal plate and the lower horizontal plate. The lower horizontal plate is arranged on the horizontal plane of the prefabricated stair treads, and the connecting vertical plate is arranged on the vertical plane of the prefabricated stair treads. The adjacent tread template units are connected and fastened by fasteners passing through the lower horizontal plate of the upper tread template unit and the upper horizontal plate of the lower tread template unit.

3. The post-casting formwork system for large-span prefabricated staircases according to claim 2 is characterized in that: The upper transverse plate and the lower transverse plate are both provided with strip-shaped adjustment holes in the step width direction, and the strip-shaped adjustment holes are used for adjusting the positions of adjacent step template units to adapt to the step width of the prefabricated stairs.

4. The post-casting formwork system for large-span prefabricated staircases according to claim 2 is characterized in that: The end of the first upper template close to the prefabricated stair tread section is connected to the upper horizontal plate of the step template unit located at the highest point in the vertical direction by fasteners, and the end of the second upper template close to the prefabricated stair tread section is also a C-shaped structure and the upper horizontal plate is connected to the lower horizontal plate of the step template unit located at the lowest point in the vertical direction by fasteners.

5. The post-casting formwork system for large-span prefabricated staircases according to claim 2 is characterized in that: It also includes an attached vibration device for vibrating the concrete entering the mold, and the first upper template, the second upper template and the lower transverse plate of the step template unit are all provided with a mounting bracket for installing the attached vibration device.

6. The post-casting formwork system for large-span prefabricated staircases according to claim 2 is characterized in that: The lower horizontal plate is also provided with a mortar outlet hole at the positive corner of the prefabricated stair tread.

7. The post-casting formwork system for large-span prefabricated staircases according to claim 1 is characterized in that: The third lower template includes a plurality of lower template units obliquely arranged on the bottom surface of the prefabricated stair tread segment. The plurality of lower template units are evenly distributed along the length direction of the bottom surface of the prefabricated stair tread segment and are connected to each other by fasteners.

8. The post-casting formwork system for large-span prefabricated staircases according to claim 7 is characterized in that: The first lower formwork and the second lower formwork have the same structure and are respectively used to support the lower surface of the prefabricated stair upper platform and the lower surface of the prefabricated stair lower platform. The end of the first lower formwork close to the prefabricated stair tread section is connected to the end of the lower formwork unit located at the highest point in the vertical direction through fasteners, and the end of the second lower formwork close to the prefabricated stair tread section is connected to the end of the lower formwork unit located at the lowest point in the vertical direction through fasteners.

9. The post-casting formwork system for large-span prefabricated staircases according to claim 1 is characterized in that: A support rod assembly is also provided between the lower mold assembly and the construction floor, and the support rod assembly is used to support the formwork system.

Images