A support-free connection node between prefabricated stairs and floor slabs

Abstract

This utility model discloses a support-free connection node between a prefabricated staircase and a floor slab, comprising: an upper stair beam, set on the upper rest platform beam of the building, with a support groove 1 at one end of its upper surface; a lower stair beam, set on the lower rest platform beam of the building, with a support groove 2 at one end of its upper surface; positioning adjustment columns, respectively vertically set on both sides of the center of the lower inner surface of the first and second support grooves; positioning supports, vertically set on the outer side above the center of the positioning adjustment columns; and a prefabricated staircase, set between the upper and lower stair beams. The ends of the prefabricated staircase sections of this utility model are placed into the first and second support grooves respectively, eliminating the need for temporary support erection and removal, effectively shortening the construction period and reducing the installation difficulty of the prefabricated staircase; by inserting the positioning adjustment columns into the positioning holes and adjusting the positioning supports, the prefabricated staircase can be quickly positioned, thereby improving the installation efficiency of the prefabricated staircase.

Description

Technical Field

[0001] This utility model relates to the technical field of prefabricated stairs, and in particular to a support-free connection node between a prefabricated staircase and a floor slab. Background Technology

[0002] Prefabricated concrete structures are a rapidly developing building structure technology in recent years. By using prefabricated components in factories, it separates the manufacturing of building materials from the construction process, achieving industrialization and large-scale production. This offers numerous advantages, including reduced construction time, lower resource waste, and green energy conservation and carbon reduction. Among prefabricated concrete components, prefabricated staircases are widely used in multi-story buildings and public facilities, providing convenient and quick access to different floors. Therefore, the connection performance of prefabricated staircases is crucial to ensuring structural safety and stability.

[0003] Most existing precast stairs use pre-embedded bolts or pre-reserved connecting steel bars, and are connected to the floor structure by pouring high-strength connecting materials. This method requires extremely high precision of the pre-embedded parts, and is prone to misalignment of holes, which affects installation efficiency. In addition, precast stairs often require temporary support during installation, which seriously affects the installation efficiency of precast stairs. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a support-free connection node between a prefabricated staircase and a floor slab.

[0005] The technical solution of this utility model to achieve the above objectives is a support-free connection node between a prefabricated staircase and a floor slab, comprising:

[0006] The upper ladder beam is set on the upper rest platform beam of the building. One end of its upper surface has a support groove. Several pre-embedded steel bars are installed on the side surface of the support groove. The pre-embedded steel bars are set horizontally and evenly distributed on the side surface of the support groove. A positioning ring is installed at one end of the pre-embedded steel bars.

[0007] The lower stair beam is set on the lower rest platform beam of the building. One end of its upper surface has a support groove 2. The support groove 2 and the support groove 1 are distributed in a mirror symmetrical manner along the diagonal center line of the staircase. Several identical pre-embedded steel bars 1 are installed on the side surface of the support groove 2. One end of the pre-embedded steel bar 1 is also equipped with a positioning ring 1.

[0008] The positioning and adjusting columns are vertically installed on both sides of the center of the lower inner surface of support groove one and support groove two, respectively. The pre-embedded bars are vertically installed below the center of the columns, and their lower ends are pre-embedded in the upper and lower ladder beams. The pre-embedded bars are connected to the steel reinforcement skeleton of the upper and lower ladder beams. Two annular baffles are set above the center of the columns, and four adjusting screws are vertically set between the two annular baffles. The adjusting screws are evenly distributed on the outside of the positioning and adjusting columns.

[0009] The positioning support is vertically set on the outer side above the center of the positioning adjustment column and corresponds to the position of the adjustment screw. The upper and lower ends of its side surface are movably hinged to positioning rods. One end of the positioning rod is movably hinged to a positioning seat. The lower positioning seat is movably fitted on the adjustment screw and connected to the annular baffle and the positioning adjustment column. The upper positioning seat is fitted on the adjustment screw and threadedly connected to the adjustment screw.

[0010] A prefabricated staircase is installed between the upper and lower stair beams, with the ends of the upper and lower stair sections placed in support groove 1 and support groove 2 respectively, spaced a certain distance from the side surfaces of support groove 1 and support groove 2. Several pre-embedded steel bars 2 are set on the outer surfaces of the ends of the upper and lower stair sections, corresponding to the positions of the pre-embedded steel bars 1. A positioning ring 2 is installed at one end of the pre-embedded steel bar 2, which is located below the positioning ring 1. Positioning holes are opened on the ends of the upper and lower stair sections, corresponding to the positions of the positioning adjustment columns. Several L-shaped positioning bars are installed inside the positioning holes and are evenly distributed.

[0011] The long bolt is movably inserted into the aligned positioning ring one and positioning ring two, and is fixed by the fixing nut.

[0012] Preferably, the positioning adjustment column is inserted into the positioning hole, and the positioning support is adjusted by the adjusting screw so that the positioning support is supported on the inner wall of the positioning hole.

[0013] Preferably, a hexagonal head is installed at the upper end of the adjusting screw, and the hexagonal head has the same head size as the national standard bolt.

[0014] Preferably, after the prefabricated staircase is installed, high-strength grouting material is filled into the gaps between support groove one and support groove two and the ends of the prefabricated staircase section.

[0015] Preferably, after the prefabricated staircase is installed, high-strength grout is also poured into the positioning holes.

[0016] Preferably, the depth of the support groove is the same as the thickness of the end of the prefabricated staircase.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. By placing the ends of the prefabricated staircase sections into support groove one and support groove two respectively, the prefabricated staircase can be installed without the need for temporary support erection and dismantling, effectively shortening the construction cycle and reducing the installation difficulty of the prefabricated staircase.

[0019] 2. By inserting the positioning adjustment column into the positioning hole on the precast staircase and adjusting the positioning support by adjusting the screw, the precast staircase can be quickly positioned, reducing the installation accuracy of the precast components and improving the installation efficiency of the precast staircase.

[0020] 3. The upper and lower ladder beams support the precast stairs, and the long bolts connect the positioning ring one and positioning ring two. At the same time, the L-shaped positioning ribs cooperate with the positioning support and positioning rod to form a whole after the high-strength grout is poured and hardened. The strong pin action improves the safety redundancy of the connection node and ensures the overall rigidity and durability. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a support-free connection node between a prefabricated staircase and a floor slab as described in this utility model;

[0022] Figure 2 This utility model describes Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 This is a front view of the positioning adjustment column and positioning support of this utility model;

[0024] Figure 4 This utility model describes Figure 3 Top view;

[0025] Figure 5 This is a partially enlarged side sectional view of the end of the prefabricated staircase section described in this utility model; in the figure:

[0026] 1. Upper ladder beam; 11. Support groove one; 12. Embedded steel bar one; 13. Positioning ring one; 2. Lower ladder beam; 21. Support groove two; 3. Positioning adjustment column; 31. Embedded steel bar; 32. Annular baffle; 33. Adjusting screw; 34. Hexagonal head; 4. Positioning support; 41. Positioning rod; 42. Positioning seat; 5. Precast staircase; 51. Embedded steel bar two; 52. Positioning ring two; 53. Positioning hole; 54. L-shaped positioning bar; 6. Long bolt; 61. Fixing nut; 7. High-strength grouting material. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model provides a technical solution, such as Figures 1-5 As shown; a support-free connection node between a prefabricated staircase and a floor slab includes: an upper stair beam 1, set on the upper rest platform beam of the building, with a support groove 11 at one end of its upper surface, and several pre-embedded steel bars 12 installed on the side surface of the support groove 11. The pre-embedded steel bars 12 are horizontally arranged and evenly distributed on the side surface of the support groove 11, and a positioning ring 13 is installed at one end of the pre-embedded steel bars 12; a lower stair beam 2, set on the lower rest platform beam of the building, with a support groove 21 at one end of its upper surface, the support groove 21 and the support groove 11 being mirror-symmetrically distributed along the diagonal center line of the staircase, and several identical pre-embedded steel bars 12 installed on the side surface of the support groove 21, and a positioning ring 13 is also installed at one end of the pre-embedded steel bars 12.

[0029] In this embodiment of the utility model, support groove 11 and support groove 21 provide a precise and ready-made "support base" for the end of the stair section; when the prefabricated stair 5 is hoisted, it can be placed directly into the groove, and its own weight is borne by the bottom of the groove, realizing instantaneous initial positioning and stability, avoiding the cumbersome procedures such as on-site formwork and temporary support required in traditional methods, and greatly improving construction efficiency.

[0030] In this embodiment of the utility model, the support of the prefabricated staircase 5 is provided by the support groove 11 and the support groove 21, so that the vertical load of the prefabricated staircase is directly transmitted to the bottom of the support groove 11 and the support groove 21 through the end of its stair section, and then transmitted to the upper stair beam 1 and the lower stair beam 2 respectively, thus ensuring the basic requirements of structural safety.

[0031] In this embodiment of the utility model, the embedded steel bar 12 and the positioning ring 13 are connected to the prefabricated staircase 5 by the long bolt 6. The pin action formed by them provides a strong transverse shear connection structure, thereby effectively transferring the horizontal force borne by the staircase to the main structural beam and improving the installation strength of the prefabricated staircase 5.

[0032] Positioning adjustment columns 3 are vertically installed on both sides of the center of the lower inner surface of support groove 11 and support groove 21, respectively. Embedded reinforcing bars 31 are vertically installed below their centers, with their lower ends embedded in the upper ladder beam 1 and lower ladder beam 2. The embedded reinforcing bars 31 are connected to the steel reinforcement skeleton of the upper ladder beam 1 and lower ladder beam 2. Two annular baffles 32 are installed above their centers, and four adjusting screws 33 are vertically installed between the two annular baffles 32. The adjusting screws 33 are evenly distributed on the outside of the positioning adjustment columns 3. Positioning support seats 4 are vertically installed on the outside above the center of the positioning adjustment columns 3, corresponding to the position of the adjusting screws 33. Positioning rods 41 are movably hinged at both ends of their side surface. One end of the positioning rod 41 is movably hinged to a positioning seat 42. The lower positioning seat 42 is movably fitted onto the adjusting screw 33 and connected to the annular baffle 32 and the positioning adjustment column 3. The upper positioning seat 42 is fitted onto the adjusting screw 33 and threadedly connected to the adjusting screw 33.

[0033] In this embodiment of the utility model, minor errors are inevitable in prefabrication and on-site construction. The positioning adjustment column 3 is directly cast on the upper ladder beam 1 and the lower ladder beam 2 respectively, which ensures the stability of the positioning adjustment column 3 itself. The installation strength of the positioning adjustment column 3 is guaranteed by the setting of the embedded part 31.

[0034] In this embodiment of the invention, a rotatable adjusting screw 33 is used to rotate and connect with the upper positioning seat 42 via a threaded connection, thereby adjusting the height of the upper positioning seat 42. In turn, the positioning rod 41 is used to adjust the position of the positioning support 4, thus pre-adjusting the installation position of the prefabricated staircase 5 to ensure the installation accuracy of the prefabricated staircase 5. This allows the prefabricated staircase 5 to be quickly positioned during installation through the contact between the positioning support 4 and the positioning hole 5, making the installation of the prefabricated staircase more convenient and faster.

[0035] A prefabricated staircase 5 is installed between the upper stair beam 1 and the lower stair beam 2, with the ends of its upper and lower stair sections placed in support groove 11 and support groove 21 respectively, spaced a certain distance from the side surfaces of support groove 11 and support groove 21. Several pre-embedded steel bars 2 51 are set on the outer surfaces of the ends of the upper and lower stair sections, corresponding to the positions of pre-embedded steel bars 12. One end of the pre-embedded steel bars 2 51 is equipped with a positioning ring 2 52, which is located below the positioning ring 13. Positioning holes 53 are opened on the ends of the upper and lower stair sections, corresponding to the positions of the positioning adjustment column 3. Several L-shaped positioning ribs 54 are installed inside the positioning holes 53 and are evenly distributed. Long bolts 6 are movably inserted into the aligned positioning rings 13 and 2 52 and fixed by fixing nuts 61.

[0036] In this embodiment of the utility model, the end of the prefabricated staircase is spaced a certain distance from the side surfaces of the support groove 11 and the support groove 21, which facilitates the fine-tuning of the prefabricated staircase 5 during installation, and at the same time allows the high-strength grout 7 to be smoothly and fully filled into the entire contact surface to form a uniform stress layer.

[0037] In this embodiment of the utility model, the positioning ring 13 and the positioning ring 52 are connected in series and fixed by the long bolt 6, so that the prefabricated staircase 5 can be quickly connected to the upper ladder beam 1 and the lower ladder beam 2, and the connection quality is stable and reliable. In addition, the horizontal force borne by the staircase is transferred to the main structural beam, thereby improving the installation strength of the prefabricated staircase 5.

[0038] In this embodiment of the utility model, the positioning hole 53 provides working space for the positioning adjustment column 3 and the positioning support 4, enabling them to position the prefabricated staircase 5 by expansion.

[0039] In this embodiment of the utility model, the L-shaped positioning rib 54 is provided in the positioning hole 53. The L-shaped positioning rib 54 and the positioning support 4 are arranged in an alternating manner. Through the diagonal bracing design of the positioning rod 41, after the high-strength grout 7 is poured and solidified, a strong composite pin is formed to enhance the connection strength of the precast staircase 5 and improve the safety redundancy of the connection node.

[0040] In this embodiment of the utility model, the prefabricated staircase 5 is an independent module. The size and position of all its interfaces (embedded steel bar 2 51, positioning ring 2 52, positioning hole 53, L-shaped positioning bar 54) are pre-designed and completely correspond to the corresponding interfaces on the upper ladder beam 1 and the lower ladder beam 2. At the same time, the upper ladder beam 1 and the lower ladder beam 2 are also pre-designed directly according to the corresponding size and position. This makes the hoisting and connection on the construction site like "assembling building blocks", making the installation process of the prefabricated staircase 5 standardized, greatly reducing the construction difficulty and dependence on workers' skills.

[0041] In this utility model, the positioning adjustment column 3 is inserted into the positioning hole 53, and the positioning support 4 is adjusted by the adjusting screw 33 so that the positioning support 4 is supported on the inner wall of the positioning hole 53; so that the positioning support 4 can make fine adjustments to the prefabricated staircase 5 to ensure the installation accuracy of the prefabricated staircase 5.

[0042] In this utility model, a hexagonal head 34 is installed on the upper end of the adjusting screw 33. The hexagonal head 34 has the same bolt head size as the national standard bolt. This allows workers to quickly rotate the adjusting screw 33 with a wrench to adjust the position of the positioning support 4.

[0043] In this utility model, after the prefabricated staircase 5 is installed, high-strength grout 7 is filled into the gap between the support groove 11 and the support groove 21 and the end of the prefabricated staircase 5; after the prefabricated staircase 5 is installed, high-strength grout 7 is also poured into the positioning hole 53; the connection strength of the node is improved, and the entire connection node is formed as a whole, while preventing the corrosion of the internal metal structure, so as to improve its durability.

[0044] In this utility model, the depth of the support groove 11 is the same as the thickness of the end of the prefabricated staircase 5; this ensures the flatness of the prefabricated staircase 5 during installation, thereby ensuring construction quality and final aesthetics.

[0045] When using this utility model, before installing the prefabricated staircase 5, the upper ladder beam 1 and the lower ladder beam 2 are pre-installed on the corresponding rest platform beams on the building, ensuring the accuracy of the elevation and position. The positions of the support groove 11, support groove 21 and positioning adjustment column 3 are checked to ensure accuracy. Finally, the upper ladder beam 1 and the lower ladder beam 2 are cast together with the corresponding rest platform beams to form a whole.

[0046] When it is necessary to install the prefabricated staircase 5, firstly, the staff determines the installation position of the prefabricated staircase 5, and according to the installation position of the prefabricated staircase 5, measures the distance between each positioning support 4 and the installation position of the prefabricated staircase 5. By using a wrench to adjust the hexagonal head 34, the adjusting screw 33 is rotated, and by adjusting the screw 33 and the upper positioning seat 42 through the threaded connection, the upper positioning seat 42 is adjusted downward until the positioning support 4 is adjusted to the appropriate position. This allows the prefabricated staircase 5 to be positioned by the contact between the positioning support 4 and the inner wall of the positioning hole 53 during installation.

[0047] At this time, the prefabricated staircase 5 is lifted smoothly using hoisting equipment, and the upper surfaces of the upper and lower stair sections of the prefabricated staircase 5 are level after being lifted, so that the posture of the prefabricated staircase 5 during hoisting is the same as its installation posture. Then, the prefabricated staircase 5 is hoisted above the installation position, and then the prefabricated staircase 5 is slowly lowered. By adjusting the prefabricated staircase 5, the positioning hole 53 of the prefabricated staircase 5 is aligned with the positioning adjustment column 3.

[0048] As the prefabricated staircase 5 slowly descends, the positioning adjustment column 3 is gradually inserted into the positioning hole 53. Then, the workers make fine adjustments to the prefabricated staircase 5 to align the positioning hole 53 with the positioning support 4 around the positioning adjustment column 3. Then, the prefabricated staircase 5 is controlled to continue descending, and the positioning support 4 is inserted into the positioning hole 53. By using the positioning support 4 to position the positioning hole 53, the prefabricated staircase 5 is installed in the corresponding position. Then, the prefabricated staircase 5 can be completely lowered, so that the ends of the upper and lower stair sections are placed in the support groove 11 and support groove 21 respectively.

[0049] Subsequently, the staff used a wrench to control the adjusting screw 33 for fine-tuning, so that the four positioning supports 4 tightened the positioning holes 53 respectively. Then, the staff used tools such as pry bars to pry the embedded steel bar 12, so that the embedded steel bar 12 moved the positioning ring 13 and moved the positioning ring 13 above the positioning ring 2 52. When the positioning ring 13 and the positioning ring 2 52 were aligned, the long bolt 6 was inserted into the positioning ring 13 and the positioning ring 2 52. Then, the positioning ring 13 was adjusted until the long bolt 6 was inserted into all the positioning rings 13 and positioning ring 2 52 in the same position, and the fixing nut 6 was installed on the long bolt 6.

[0050] Finally, the workers can fill the gaps between the ends of the precast staircase 5 and the support groove 11 and support groove 21, as well as the positioning hole 53, with the high-strength grout 7, and cover the upper surface of the high-strength grout 7 with a plastic film to ensure the hardening effect of the high-strength grout 7 and avoid frequent alignment and curing.

[0051] In a specific implementation of this utility model, the exposed part of the pre-embedded steel bar 12 is bent at a certain arc to avoid the positioning ring 13 being misaligned with the positioning ring 2 52 during the installation of the prefabricated staircase 5, thus avoiding the obstruction of the positioning ring 13 and affecting the rapid assembly of the prefabricated staircase 5.

[0052] In this embodiment of the utility model, the upper and lower ends of the positioning support 4 are arc-shaped surfaces, so that when the prefabricated stair 5 is installed, the positioning hole 3 can be quickly fitted onto the outside of the positioning support 4 to facilitate the assembly of the prefabricated stair 5.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precast stair and floor slab unbraced connection node, characterized by, include: The upper ladder beam is set on the upper rest platform beam of the building. One end of its upper surface has a support groove. Several pre-embedded steel bars are installed on the side surface of the support groove. The pre-embedded steel bars are set horizontally and evenly distributed on the side surface of the support groove. A positioning ring is installed at one end of the pre-embedded steel bars. The lower stair beam is set on the lower rest platform beam of the building. One end of its upper surface has a support groove 2. The support groove 2 and the support groove 1 are distributed in a mirror symmetrical manner along the diagonal center line of the staircase. Several identical pre-embedded steel bars 1 are installed on the side surface of the support groove 2. One end of the pre-embedded steel bar 1 is also equipped with a positioning ring 1. The positioning and adjusting columns are vertically installed on both sides of the center of the lower inner surface of support groove one and support groove two, respectively. The pre-embedded bars are vertically installed below the center of the columns, and their lower ends are pre-embedded in the upper and lower ladder beams. The pre-embedded bars are connected to the steel reinforcement skeleton of the upper and lower ladder beams. Two annular baffles are set above the center of the columns, and four adjusting screws are vertically set between the two annular baffles. The adjusting screws are evenly distributed on the outside of the positioning and adjusting columns. The positioning support is vertically set on the outer side above the center of the positioning adjustment column and corresponds to the position of the adjustment screw. The upper and lower ends of its side surface are movably hinged to positioning rods. One end of the positioning rod is movably hinged to a positioning seat. The lower positioning seat is movably fitted on the adjustment screw and connected to the annular baffle and the positioning adjustment column. The upper positioning seat is fitted on the adjustment screw and threadedly connected to the adjustment screw. A prefabricated staircase is installed between the upper and lower stair beams, with the ends of the upper and lower stair sections placed in support groove 1 and support groove 2 respectively, spaced a certain distance from the side surfaces of support groove 1 and support groove 2. Several pre-embedded steel bars 2 are set on the outer surfaces of the ends of the upper and lower stair sections, corresponding to the positions of the pre-embedded steel bars 1. A positioning ring 2 is installed at one end of the pre-embedded steel bar 2, which is located below the positioning ring 1. Positioning holes are opened on the ends of the upper and lower stair sections, corresponding to the positions of the positioning adjustment columns. Several L-shaped positioning bars are installed inside the positioning holes and are evenly distributed. The long bolt is movably inserted into the aligned positioning ring one and positioning ring two, and is fixed by the fixing nut.

2. A precast stair and floor slab unbraced connection node according to claim 1, wherein, The positioning adjustment column is inserted into the positioning hole, and the positioning support is adjusted by the adjusting screw so that the positioning support is supported on the inner wall of the positioning hole.

3. A precast stair and floor slab unbraced connection node according to claim 1, wherein, The upper end of the adjusting screw is equipped with a hexagonal head, which has the same head size as the national standard bolt.

4. The support-free connection node between a precast staircase and a floor slab according to claim 1, characterized in that, After the prefabricated staircase is installed, high-strength grouting material is filled into the gaps between support groove one and support groove two and the ends of the prefabricated staircase section.

5. A precast stair and floor slab unbraced connection node according to claim 1, wherein, After the prefabricated stairs are installed, high-strength grout is poured into the positioning holes.

6. A precast stair and floor slab unbraced connection node according to claim 1, wherein, The depth of the support groove is the same as the thickness of the end of the precast staircase.

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