Prefabricated assembly type stair construction auxiliary device

Abstract

The utility model belongs to building assembled connecting device technical field, and a prefabricated assembly type stair construction auxiliary device belongs to, including cantilever top die, ladder beam suspension mould, bottom die, side mould, cantilearn support and bolt fixing cover, and the cantilever top die, ladder beam suspension mould, bottom die and side mould form the pouring cavity of cantilever, and the cantilever top die and ladder beam suspension mould are perpendicular to each other and set up, and the cantilearn support is clamped on the ladder beam suspension mould through the positioning structure, and the bolt fixing cover is set up on the cantilearn support, and the embedded bolt is set up in the bolt fixing cover, and the end passes through the cantilever top die. The embedded bolt of the utility model is clamped on the ladder beam suspension mould indirectly through cantilearn support, the position of embedded bolt is accurate through positioning structure, the embedded bolt is fixed at the accurate position through bolt fixing cover, and when pouring concrete, the impact force of concrete generally acts on the lower end of embedded bolt, and the cantilever top die is limited to make it not deviate and tilt.

Description

Technical Field

[0001] A prefabricated staircase construction auxiliary device belongs to the technical field of building assembly connection devices. Background Technology

[0002] In the commonly used construction method of precast reinforced concrete slab stairs, when constructing the cantilever beam, the pre-embedded bolts of the cantilever beam are tied and fixed to the auxiliary reinforcement with iron wire. When pouring concrete, the concrete of the stair beam is first poured to the top elevation of the cantilever beam. After a certain interval, the remaining part of the stair beam and the concrete of the stair slab are poured. When installing the precast stairs, workers need to bend over to observe the bottom of the slab or lean over the top of the stair slab to observe the alignment of the pin key reserved hole with the pre-embedded bolt of the cantilever beam. However, this method has several drawbacks. When pouring concrete into the cantilever beams during construction, the pre-embedded bolts of the cantilever beams, which are tied to the auxiliary reinforcing bars with wire, are prone to tilting or shifting. Furthermore, when pouring concrete, the concrete for the ladder beams is first poured to the top elevation of the cantilever beams, and after a certain interval, the remaining part of the ladder beams and the ladder slabs are poured. This can easily cause cold joints at the joints of the secondary pouring of the ladder beams. During the installation of the precast stairs, workers are prone to accidents such as falling from heights when they bend over to observe the bottom of the slab or lean over the top of the ladder section to observe the alignment of the pin key pre-drilled holes with the pre-embedded bolts of the cantilever beams. This also leads to low installation efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a prefabricated assembly staircase construction auxiliary device that can position and fix the pre-embedded bolts of the cantilever beam, so as to achieve accurate positioning of the pre-embedded bolts after the concrete of the cantilever beam is poured.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: the prefabricated assembled staircase construction auxiliary device includes a cantilever top formwork, a ladder beam suspension formwork, a bottom formwork, a side formwork, a cantilever support, and a bolt fixing sleeve. The cantilever top formwork, ladder beam suspension formwork, bottom formwork, and side formwork form a casting cavity for the cantilever. The cantilever top formwork and the ladder beam suspension formwork are set perpendicular to each other. The cantilever support is fixed on the ladder beam suspension formwork by a positioning structure. The bolt fixing sleeve is set on the cantilever support. The pre-embedded bolt is set in the bolt fixing sleeve, and its end passes through the cantilever top formwork.

[0005] Preferably, the positioning structure is a positioning block, which is vertically set at the end of the cantilever support. The positioning block and the cantilever support form a right angle for engagement, and the right angle for engagement is set at the external corner of the ladder beam formwork.

[0006] Preferably, it also includes a keel, which is set on the ladder beam suspension formwork, and the cantilever bracket is connected to the keel by fixing screws.

[0007] Preferably, the cantilever support includes a positioning plate, which is horizontally positioned, and a positioning block is positioned at the end of the positioning plate. The positioning block and the positioning plate form a right angle for engagement, and the positioning plate is fixedly connected to the ladder beam formwork.

[0008] Preferably, the cantilever bracket also includes a mounting plate, which is disposed at one end of the positioning plate and extends upward perpendicularly to the positioning plate, with bolt fixing sleeves vertically disposed on the mounting plate.

[0009] Preferably, it also includes a fastening screw, and the bolt fixing sleeve is provided with fixing bolt holes at intervals, and the fastening screw is set in the fixing bolt holes.

[0010] Compared with existing technologies, the beneficial effects of this technical solution are: In this invention, the pre-embedded bolts are indirectly secured to the ladder beam formwork via a cantilever bracket. A positioning structure ensures accurate bolt placement, and a bolt fixing sleeve secures the bolts in their precise positions. During concrete pouring, the impact force of the concrete generally acts on the lower end of the pre-embedded bolts; the limiting effect of the cantilever top formwork prevents them from shifting or tilting. The cantilever top formwork, together with the ladder beam formwork, bottom formwork, and side formwork, forms a closed formwork system, breaking away from the traditional method of pouring concrete in stages and forming the ladder beam in one go, effectively preventing cold joints. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of a prefabricated assembled staircase construction auxiliary device according to the present invention.

[0012] Figure 2 This is a schematic diagram of the structure of this utility model.

[0013] Figure 3 This is a schematic diagram of installing a prefabricated staircase using this utility model.

[0014] Among them: 1. Top formwork with cantilever; 2. Suspended formwork for ladder beam; 3. Bottom formwork; 4. Side formwork; 5. Cantilever bracket; 501. Positioning block; 502. Positioning plate; 503. Mounting plate; 6. Bolt fixing sleeve; 7. Fastening screw; 8. Top formwork round hole; 9. Embedded bolt; 10. Keel; 11. Guide tube; 12. Fixing screw; 13. Reinforcing cage; 14. Reserved hole; 15. Ladder section plate. Detailed Implementation

[0015] Figures 1-3 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-3 The present invention will be further described below.

[0016] Reference Figures 1-2This prefabricated assembled staircase construction auxiliary device includes a cantilever top formwork 1, a stair beam suspension formwork 2, a bottom formwork 3, side formwork 4, a cantilever support 5, and a bolt fixing sleeve 6. Unlike traditional stair beam and cantilever formwork, it also includes a cantilever top formwork 1. The cantilever top formwork 1 is set perpendicularly to the stair beam suspension formwork 2 and is fixed to the bottom formwork 3 and side formwork 4 respectively by keel 10, forming a closed formwork system at the cantilever, which can be used to cast concrete in one go. The bolt fixing sleeve 6 is hung on the upper end of the stair beam suspension formwork 2 by the cantilever support 5, and the pre-embedded bolts 9 are set in the bolt fixing sleeve 6, with their ends passing through the cantilever top formwork 1.

[0017] Specifically, the cantilever bracket 5 includes a positioning block 501, a positioning plate 502, and a mounting plate 503. The positioning block 501, the mounting plate 503, and the positioning plate 502 are integrally formed. The mounting plate 503 and the positioning plate 502 are perpendicular to each other and form an L-shape. The mounting plate 503 is vertically set, and the positioning plate 502 is horizontally set. The positioning block 501 is set at the end of the positioning plate 502 and extends downward and is perpendicular to the positioning plate 502. The positioning block 501 and the positioning plate 502 form a right angle for positioning and engaging. When the positioning plate 502 is set at the upper end of the ladder beam formwork 2, the right angle formed by the positioning block 501 and the positioning plate 502 is engaged at the external corner of the ladder beam formwork 2.

[0018] The positioning plate 502 is set at the upper end of the ladder beam suspension formwork 2. The keel 10 between the ladder beam suspension formwork 2 and the two side formworks 4 provides support for the positioning plate 502. The positioning plate 502 is provided with bolt holes, and the positioning plate 502 is fixed to the keel 10 by fixing screws 12.

[0019] The bolt fixing sleeve 6 is vertically welded to the mounting plate 503 and to the opposite side of the positioning plate 502. The length of the bolt fixing sleeve 6 is less than the height of the ladder beam cantilever formwork 2. The bolt fixing sleeve 6 is suspended above the cantilever bracket 5 above the top formwork 1 of the cantilever lug. One end of the pre-embedded bolt 9 extends into the bolt fixing sleeve 6. The bolt fixing sleeve 6 has two fixing bolt holes spaced apart. The pre-embedded bolt 9 is locked in the bolt fixing sleeve 6 by two fastening screws 7 with handles. This utility model can adjust the installation height of the pre-embedded bolt 9 in the bolt fixing sleeve 6 by locking the pre-embedded bolt 9 with the fastening screws 7, so that its exposed length on the ladder beam cantilever lug meets the design requirements.

[0020] The top formwork 1 with the cantilever lug has two round holes 8. The pre-embedded bolts 9 of the two sets of auxiliary devices pass through the round holes 8 and extend into the inner cavity of the formwork. The inner cavity of the formwork also has two steel cages 13, which are respectively set between the top formwork 1 and the bottom formwork 3, and between the ladder beam suspended formwork 2 and the side formwork 4. One is set horizontally and the other is set vertically. The protruding ends of the pre-embedded bolts 9 are inserted into the gaps of the steel cages 13.

[0021] This utility model also includes a guide tube 11, which is sleeved on the upper end of the pre-embedded bolt 9 and serves as a guide during the installation of the prefabricated staircase. The guide tube 11 of this utility model is made of PPR material, and its outer diameter is smaller than the inner diameter of the reserved hole 14 of the stair plate key.

[0022] Prefabrication and installation process: First, after passing the lower ends of the two pre-embedded bolts 9 through the top mold 1 of the cantilever, adjust their height in the bolt fixing sleeve 6, and lock them in the bolt fixing sleeve 6 by tightening the bolt 7. The bolt fixing sleeve 6 is fixed to the upper end of the ladder beam suspension mold 2 by the cantilever bracket 5.

[0023] Then concrete is injected into the closed formwork cavity containing the steel cage 13. After the pouring is completed, the pre-embedded bolts 9 are embedded. The formwork system and auxiliary devices can be reused after disassembly.

[0024] Reference Figure 3 During the installation of the prefabricated staircase, the guide tube 11 is inserted from the upper end of the pre-embedded bolt 9. When the stair slab 15 is lowered to the same height as the installer's line of sight, the guide tube 11 is inserted into the pre-drilled holes 14 at both ends of the stair slab 15. As the stair slab 15 continues to fall, the upper end of the guide tube 11 gradually protrudes. When the stair slab 15 shifts, the PPR guide tube 11 will tilt accordingly. Based on the vertical tilt direction of the exposed guide tube 11, the horizontal position of the stair slab 15 can be adjusted in the opposite direction to make the guide tube 11 vertical. The slow descent allows the pre-drilled holes 14 to be aligned and inserted into the pre-embedded bolt 9.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A prefabricated assembled staircase construction auxiliary device, characterized in that: The cantilever top mold (1), ladder beam suspension mold (2), bottom mold (3), side mold (4), cantilever support (5) and bolt fixing sleeve (6) are included. The cantilever top mold (1), ladder beam suspension mold (2), bottom mold (3) and side mold (4) form the casting cavity of the cantilever. The cantilever top mold (1) and ladder beam suspension mold (2) are set perpendicular to each other. The cantilever support (5) is fixed on the ladder beam suspension mold (2) by a positioning structure. The bolt fixing sleeve (6) is set on the cantilever support (5). The pre-embedded bolt (9) is set in the bolt fixing sleeve (6) and its end passes through the cantilever top mold (1).

2. The prefabricated assembled staircase construction auxiliary device according to claim 1, characterized in that: It also includes a keel (10), which is set on the ladder beam suspension formwork (2), and the cantilever bracket (5) is connected to the keel (10) by fixing screws (12).

3. The prefabricated assembled staircase construction auxiliary device according to claim 1, characterized in that: The positioning structure is a positioning block (501), which is vertically set at the end of the cantilever bracket (5). The positioning block (501) and the cantilever bracket (5) form a right angle of engagement, which is set at the external corner of the ladder beam formwork (2).

4. The prefabricated assembled staircase construction auxiliary device according to claim 3, characterized in that: The cantilever support (5) includes a positioning plate (502), which is horizontally positioned. A positioning block (501) is positioned at the end of the positioning plate (502). The positioning block (501) and the positioning plate (502) form a right angle for engagement. The positioning plate (502) is fixedly connected to the ladder beam formwork (2).

5. The prefabricated assembled staircase construction auxiliary device according to claim 4, characterized in that: The cantilever bracket (5) also includes a mounting plate (503), which is set at one end of the positioning plate (502) and extends upward perpendicularly to the positioning plate (502). The bolt fixing sleeve (6) is vertically set on the mounting plate (503).

6. The prefabricated assembled staircase construction auxiliary device according to claim 1, characterized in that: It also includes a fastening screw (7), and the bolt fixing sleeve (6) is provided with fixing bolt holes at intervals, and the fastening screw (7) is set in the fixing bolt holes.

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