Multi-step stair formwork support bottom prefabricated supporting frame and supporting method thereof
By using a prefabricated support frame at the bottom of the multi-flight stair formwork support, and by combining longitudinal and transverse steel bars, the problem that the support frame for three-flight or higher stair formwork cannot be directly placed on the lower stair formwork is solved. This results in a shorter construction period, reduced costs, and improved safety and stability of the support frame.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ROAD & BRIDGE INT CO LTD
- Filing Date
- 2026-02-03
- Publication Date
- 2026-04-21
AI Technical Summary
When pouring three or more flights of stairs in one go, the formwork support frame cannot be placed directly on the formwork of the lower flight of stairs, which leads to extended construction period and increased costs. In addition, traditional solutions have problems such as unreliable welding quality and poor connection firmness.
The multi-flight staircase formwork support uses a prefabricated support frame at the bottom, which includes longitudinal steel bars, transverse steel bars, a first concrete block, and a second concrete block. The longitudinal steel bars and transverse steel bars are connected together to form a stable support structure. The support frame is detachable through threaded sleeves and steel pipe connectors, ensuring its sturdiness and safety.
This solves the problem that the formwork support frame for three-flight and above staircases cannot be directly placed on the formwork of the lower flight of stairs, shortening the construction period, reducing construction costs, and improving the safety and stability of the formwork support frame.
Smart Images
Figure CN121897146A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building construction technology, specifically to a prefabricated support frame at the bottom of a multi-flight staircase formwork support and its support method. Background Technology
[0002] As buildings become taller, staircases for people to move up and down also become wider, evolving from the common two-flight staircases to three-flight or four-flight staircases. For two-flight concrete staircases, steel pipe formwork supports are used during construction, resting on the already poured concrete staircase or the ground. For three-flight or higher staircases, the concrete for the lowest flight has not yet been poured, and the formwork support for the highest flight cannot be placed directly on the formwork of the lowest flight. There are two traditional solutions to this problem. The first is to pour the concrete vertically in sections, but this extends the construction period and requires construction joints, increasing construction costs. The second solution is to install steel-reinforced "T"-shaped supports on the formwork of the lowest flight. However, since these "T"-shaped supports are fabricated on-site, the welding quality cannot be guaranteed, and the connection between the "T"-shaped supports and the formwork uses nails, resulting in poor stability and safety. Summary of the Invention
[0003] The technical problem to be solved by this invention is that when three-flight or more staircases are poured in one go, the formwork support frame cannot be directly placed on the formwork of the lower flight of the staircase. In order to solve this technical problem, this invention provides a prefabricated support frame at the bottom of the formwork support for multi-flight staircases and its support method, which ensures the construction safety of the staircase formwork support frame, improves construction efficiency, saves construction time, and reduces construction costs.
[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: This invention provides a prefabricated support frame at the bottom of a multi-flight staircase formwork support, including longitudinal steel bar groups, transverse steel bars, a first concrete block, and a second concrete block. The longitudinal steel bar group includes an inclined section, a first horizontal section, and a second horizontal section. The first horizontal section and the second horizontal section are respectively connected to the two ends of the inclined section and extend in opposite directions. A first concrete block is fixedly threaded through the inclined section, and a second concrete block is fixedly threaded through the first horizontal section and the second horizontal section. The top surface of the first concrete block and the top surface of the second concrete block are both planar structures. The bottom surface of the first concrete block is an inclined slope structure, and the bottom surface of the second concrete block is a horizontal planar structure. Multiple sets of longitudinal steel bar groups are arranged side by side at intervals in the left-right direction. Transverse steel bars are fixedly threaded through multiple first concrete blocks located in the same horizontal direction in the multiple sets of longitudinal steel bar groups.
[0005] The beneficial effects of the present invention are: the prefabricated support frame at the bottom of the multi-flight stair formwork support can solve the problem that the formwork support frame of the uppermost flight of a three-flight or more staircase cannot be directly placed on the formwork of the lowermost flight of the staircase, thus shortening the construction period, reducing construction costs, and improving the safety and stability of the formwork support frame.
[0006] Based on the above technical solution, the present invention can be further improved as follows.
[0007] Furthermore, the bottom surfaces of all the first concrete blocks are located on the same inclined plane, the bottom surfaces of all the second concrete blocks on the first horizontal segment are located on the same plane, and the bottom surfaces of all the second concrete blocks on the second horizontal segment are located on the same horizontal plane.
[0008] The beneficial effect of adopting the above-mentioned further solution is that the bottom surface of all the first concrete blocks is located on the same inclined plane, which facilitates support on the stair formwork.
[0009] Furthermore, the longitudinal reinforcement group includes two longitudinal reinforcement bars arranged parallel to each other, and the transverse reinforcement bar passes through the two longitudinal reinforcement bars of the longitudinal reinforcement group.
[0010] The beneficial effect of adopting the above-mentioned further solution is that it increases the structural strength of the prefabricated support frame at the bottom of the entire multi-flight staircase formwork support.
[0011] Furthermore, one end of the longitudinal reinforcing bar is detachably connected to a first vertical steel pipe connector via a threaded sleeve, and the other end of the longitudinal reinforcing bar is detachably connected to a horizontal fastening screw via a threaded sleeve.
[0012] Furthermore, a horizontal steel pipe connector is detachably connected to the horizontal fastening screw.
[0013] Furthermore, the first vertical steel pipe connector includes a first screw and a first clamp. The first screw is welded to the outer wall of the first clamp and is arranged perpendicular to the central axis of the first clamp. The first screw is threadedly connected to the corresponding threaded sleeve.
[0014] Furthermore, the two ends of the transverse reinforcing bar are detachably connected to a second vertical steel pipe connector via threaded sleeves; the second vertical steel pipe connector includes a second screw and a second clamp, the second screw is welded to the outer wall of the second clamp and arranged perpendicular to the central axis of the second clamp, and the second screw is threadedly connected to the corresponding threaded sleeve.
[0015] Furthermore, both the first and second concrete blocks are hexahedral structures, and the second concrete block is an inverted frustum pyramid structure.
[0016] The present invention also provides a support method using a prefabricated support frame at the bottom of a multi-flight staircase formwork support as described above, comprising the following steps: S1. Make molds for the first and second concrete blocks, place the inclined sections of the longitudinal reinforcement groups and the transverse reinforcements in the mold of the first concrete block, and place the first and second horizontal sections of the longitudinal reinforcement groups in the mold of the second concrete block. Then pour the first and second concrete blocks and cure them. Pour the required first and second concrete blocks according to the number of longitudinal reinforcement groups and the number of transverse reinforcements. Once all the first and second concrete blocks that have been poured have reached the set strength, the prefabricated support frame at the bottom of the entire multi-flight staircase formwork support is completed. S2, hoist the prefabricated support frame at the bottom of the multi-run staircase formwork support into the lower run staircase formwork that has been tied with the bottom and top layer steel bars, and then tie the prefabricated support frame at the bottom of the multi-run staircase formwork support to the bottom and top layer steel bars of the lower run staircase formwork. S3, install a first vertical steel pipe connector and a horizontal steel pipe connector at both ends of the longitudinal steel bar group, and install a second vertical steel pipe connector at both ends of the transverse steel bar. According to the position of the transverse steel bar and the longitudinal steel bar group, make holes in the lower run stair formwork so that the two ends of the transverse steel bar pass through the corresponding holes and are connected and fixed to the vertical steel pipe of the lower run stair formwork support through the second vertical steel pipe connector. So that the two ends of the longitudinal steel bar group pass through the corresponding holes and are connected to the pre-embedded steel pipe in the lower run stair formwork and the horizontal steel pipe of the lower run stair formwork support through the first vertical steel pipe connector and the horizontal steel pipe of the lower run stair formwork support, respectively. S4, the horizontal steel pipes connected to the horizontal steel pipe connectors of a set of longitudinal steel bars are connected and fixed by cross fasteners, and the cross fasteners are also connected and fixed to the vertical steel pipes of the lower run stair formwork support; S5, erect the upper run stair formwork support on the precast support frame at the bottom of the multi-run stair formwork support, so that the upper run stair formwork support is supported on the top surface of the first concrete block and the top surface of the second concrete block, and tie the upper run stair formwork support to the lower run stair formwork support for fixation. S6. After the upper staircase formwork support is erected, the upper staircase formwork is erected using the upper staircase formwork support. The multi-run staircase formwork is erected and then cast in one go in the multi-run staircase formwork.
[0017] The beneficial effects of this invention are: the support method of this invention can solve the problem that the formwork support frame of the uppermost run of a three-run or higher staircase cannot be directly placed on the formwork of the lowermost run, thus shortening the construction period, reducing construction costs, and improving the safety and stability of the formwork support frame.
[0018] Furthermore, in S6, when the multi-flight staircase is a three-flight staircase, the lower flight staircase formwork support is the bottommost first flight staircase formwork support, the upper flight staircase formwork support is the topmost third flight staircase formwork support, and the middle second flight staircase formwork support and the lower flight staircase formwork support are both supported on the lower floor of the already poured concrete floor or the ground. When the multi-flight staircase is a four-flight staircase, two prefabricated support frames for the bottom of the multi-flight staircase formwork support are required. The lower flight staircase formwork support is either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The prefabricated support frames for the bottom of the multi-flight staircase formwork support are installed on either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The upper flight staircase formwork support is either the third flight staircase formwork support or the topmost fourth flight staircase formwork support. The third flight staircase formwork support is supported on the prefabricated support frames for the bottom of the multi-flight staircase formwork support of the first flight staircase formwork support. The fourth flight staircase formwork support is supported on the prefabricated support frames for the bottom of the multi-flight staircase formwork support of the second flight staircase formwork support. Both the second flight staircase formwork support and the lower flight staircase formwork support are supported on the lower floor or ground where concrete has already been poured.
[0019] The beneficial effect of adopting the above-mentioned further solution is that different numbers of prefabricated support frames at the bottom of the multi-flight staircase formwork support can be set according to different construction needs of multi-flight staircases. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention; Figure 2 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 3 ; Figure 5 This is a side view of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 6 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 4 ; Figure 7 This is a schematic diagram of the connection structure between the second horizontal section and the vertical steel pipe of the present invention; Figure 8 This is a schematic diagram of the connection structure between the first horizontal section and the horizontal steel pipe of the present invention; Figure 9 This is a schematic diagram of the connection structure between the horizontal and vertical reinforcing bars and the first concrete block of the present invention. Figure 10 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 1 ; Figure 11 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 2 ; Figure 12 This is a schematic diagram of the prefabricated support frame at the bottom of the multi-flight staircase formwork support of the present invention. Figure 3 .
[0021] The attached diagram lists the components represented by each number as follows: 1. Inclined section; 11. First horizontal section; 12. Second horizontal section; 13. First vertical steel pipe connector; 14. First screw rod; 15. First clamp; 16. Horizontal fastening screw rod; 17. Horizontal steel pipe connector; 18. Cross fastener; 2. Horizontal reinforcing bars; 21. Second vertical steel pipe connector; 22. Second threaded rod; 23. Second clamp; 3. First concrete block; 4. Second concrete block; 5. Threaded sleeve; 6. Lower staircase formwork; 61. Left formwork; 62. Right formwork; 63. Upper formwork; 64. Lower formwork; 65. Embedded steel pipes; 7. Upper staircase formwork support; 8. Formwork support for the lower runway; 81. Horizontal steel pipe; 82. Vertical steel pipe. Detailed Implementation
[0022] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.
[0023] Example 1 like Figures 1-12As shown in the figure, a prefabricated support frame at the bottom of a multi-flight staircase formwork support according to this embodiment includes longitudinal steel reinforcement groups, transverse steel reinforcement 2, first concrete blocks 3 and second concrete blocks 4. The longitudinal steel reinforcement groups include an inclined section 1, a first horizontal section 11 and a second horizontal section 12. The first horizontal section 11 and the second horizontal section 12 are respectively connected to the two ends of the inclined section 1. The first horizontal section 11 and the second horizontal section 12 extend in opposite directions. The first concrete block 3 is fixedly threaded through the inclined section 1. The second concrete block 4 is fixedly threaded through the first horizontal section 11 and the second horizontal section 12. The top surface of the first concrete block 3 and the top surface of the second concrete block 4 are both planar structures. The bottom surface of the first concrete block 3 is an inclined slope structure. The bottom surface of the second concrete block 4 is a horizontal planar structure. Multiple sets of longitudinal steel reinforcement groups are arranged side by side at intervals in the left and right direction. Transverse steel reinforcement 2 is fixedly threaded through multiple first concrete blocks 3 located in the same horizontal direction in the multiple sets of longitudinal steel reinforcement groups.
[0024] like Figure 5 and Figure 6 As shown, in a preferred embodiment, the bottom surfaces of all first concrete blocks 3 are located on the same inclined plane, the bottom surfaces of all second concrete blocks 4 on the first horizontal segment 11 are located on the same plane, and the bottom surfaces of all second concrete blocks 4 on the second horizontal segment 12 are located on the same horizontal plane. The fact that the bottom surfaces of all first concrete blocks 3 are located on the same inclined plane facilitates support on the staircase formwork.
[0025] In this embodiment, both the longitudinal and transverse reinforcing bars are made of HRB400 threaded steel bars.
[0026] This embodiment of a prefabricated support frame at the bottom of a multi-flight staircase formwork support can solve the problem that the formwork support frame of the uppermost flight of a three-flight or higher staircase cannot be directly placed on the formwork of the lowermost flight, thus shortening the construction period, reducing construction costs, and improving the safety and stability of the formwork support frame.
[0027] Example 2 Based on Example 1, this example provides a preferred connection scheme for longitudinal reinforcement groups. For example... Figures 1-6 As shown, the longitudinal reinforcement group includes two longitudinal reinforcement bars arranged parallel to each other vertically, and the transverse reinforcement bar 2 passes between the two longitudinal reinforcement bars of the longitudinal reinforcement group. This increases the structural strength of the prefabricated support frame at the bottom of the entire multi-flight staircase formwork support.
[0028] like Figures 1-5 As shown, in a preferred embodiment, one end of the longitudinal reinforcing bar is detachably connected to a first vertical steel pipe connector 13 via a threaded sleeve 5, and the other end of the longitudinal reinforcing bar is detachably connected to a horizontal fastening screw 16 via a threaded sleeve 5.
[0029] Specifically, such as Figure 8 As shown, in this embodiment, a horizontal steel pipe connector 17 is detachably connected to the horizontal fastening screw 16. The horizontal steel pipe connector 17 may be a double crescent clamp.
[0030] Specifically, such as Figure 7 As shown, the first vertical steel pipe connector 13 in this embodiment includes a first screw 14 and a first clamp 15. The first screw 14 is welded to the outer wall of the first clamp 15 and arranged perpendicular to the central axis of the first clamp 15. The first screw 14 is threadedly connected to the corresponding threaded sleeve 5.
[0031] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment provides a preferred connection scheme for the transverse reinforcing bar 2. For example... Figure 9 As shown, the two ends of the transverse steel bar 2 are detachably connected to a second vertical steel pipe connector 21 via a threaded sleeve 5; the second vertical steel pipe connector 21 includes a second screw 22 and a second clamp 23, the second screw 22 is welded to the outer wall of the second clamp 23 and arranged perpendicular to the central axis of the second clamp 23, and the second screw 22 is threadedly connected to the corresponding threaded sleeve 5.
[0032] like Figure 7 and Figure 9 As shown, in a specific embodiment, the first concrete block 3 and the second concrete block 4 are both hexahedral structures, and the second concrete block 4 is an inverted frustum pyramid structure.
[0033] Example 4 This embodiment provides a support method using a prefabricated support frame at the bottom of a multi-flight staircase formwork support as described in any of the above embodiments, including the following steps: S1, make molds for the first concrete block 3 and the second concrete block 4, and place the inclined section 1 and the transverse steel bar 2 of the longitudinal steel bar group into the mold of the first concrete block 3, and place the first horizontal section 11 and the second horizontal section 12 of the longitudinal steel bar group into the mold of the second concrete block 4, then pour the first concrete block 3 and the second concrete block 4 and cure them; pour the required first concrete block 3 and the second concrete block 4 according to the number of longitudinal steel bar groups and the number of transverse steel bars 2. Once all the first concrete blocks 3 and the second concrete blocks 4 that have been poured have reached the set strength, the prefabricated support frame at the bottom of the entire multi-flight staircase formwork support is completed. S2, hoist the prefabricated support frame at the bottom of the multi-run staircase formwork support into the lower run staircase formwork that has been tied with the bottom and top layer steel bars, and then tie the prefabricated support frame at the bottom of the multi-run staircase formwork support to the bottom and top layer steel bars of the lower run staircase formwork. S3, install the first vertical steel pipe connector 13 and the horizontal steel pipe connector 17 at both ends of the longitudinal steel bar group, and install the second vertical steel pipe connector 21 at both ends of the transverse steel bar 2. According to the position of the transverse steel bar 2 and the longitudinal steel bar group, make holes in the lower run stair formwork 6 so that the two ends of the transverse steel bar 2 pass through the corresponding holes and are connected and fixed to the vertical steel pipe 82 of the lower run stair formwork support 8 through the second vertical steel pipe connector 21. So that the two ends of the longitudinal steel bar group pass through the corresponding holes and are connected to the pre-embedded steel pipe 65 in the lower run stair formwork 6 and the horizontal steel pipe 81 of the lower run stair formwork support 8 through the first vertical steel pipe connector 13 and the horizontal steel pipe connector 17 respectively. Specifically, such as Figures 10-12 As shown, in this embodiment, the two ends of the transverse reinforcing bar 2 pass through the left template 61 and right template 62 of the lower staircase template 6, respectively, and are connected and fixed to the vertical steel pipe 82 of the lower staircase template support 8 through the second vertical steel pipe connector 21. One end of the longitudinal reinforcing bar group is connected and fixed to the pre-embedded steel pipe 65 pre-embedded in the lower template 64 of the lower staircase template 6 through the first vertical steel pipe connector 13, and the other end of the longitudinal reinforcing bar group is connected and fixed to the horizontal steel pipe 81 at the upper template 63 of the lower staircase template 6 through the horizontal steel pipe connector 17.
[0034] S4, the horizontal steel pipe 81 connected to the horizontal steel pipe connector 17 of the set of longitudinal steel bars is connected and fixed by a cross fastener 18, and the cross fastener 18 is also connected and fixed to the vertical steel pipe 82 of the lower run stair formwork support 8; specifically, the horizontal steel pipe 81 connected to the horizontal steel pipe connector 17 of the set of longitudinal steel bars is connected and fixed by a cross fastener 18, and the cross fastener 18 is also connected and fixed to the vertical steel pipe 82 of the lower run stair formwork support 8; S5, erect the upper run stair formwork support 7 on the precast support frame at the bottom of the multi-run stair formwork support, so that the upper run stair formwork support 7 is supported on the top surface of the first concrete block 3 and the top surface of the second concrete block 4, and tie the upper run stair formwork support 7 to the lower run stair formwork support 8 for fixation. S6. After the upper staircase formwork support 7 is erected, the upper staircase formwork is erected using the upper staircase formwork support 7. The multi-run staircase formwork is erected and the multi-run staircase is cast in one go in the multi-run staircase formwork.
[0035] Furthermore, in S6, when the multi-flight staircase is a three-flight staircase, the lower flight staircase formwork support 8 is the bottommost first flight staircase formwork support, the upper flight staircase formwork support is the topmost third flight staircase formwork support, and the middle second flight staircase formwork support and the lower flight staircase formwork support 8 are both supported on the lower floor of the already poured concrete floor or ground. When the multi-flight staircase is a four-flight staircase, two prefabricated support frames for the bottom of the multi-flight staircase formwork support are required. The lower flight staircase formwork support 8 is either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The prefabricated support frames are installed on either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The upper flight staircase formwork support is either the third flight staircase formwork support or the topmost fourth flight staircase formwork support. The third flight staircase formwork support is supported on the prefabricated support frames at the bottom of the multi-flight staircase formwork support of the first flight staircase formwork support, and the fourth flight staircase formwork support is supported on the prefabricated support frames at the bottom of the multi-flight staircase formwork support of the second flight staircase formwork support. Both the second flight staircase formwork support and the lower flight staircase formwork support 8 are supported on the lower floor with already poured concrete or the ground. The number of prefabricated support frames at the bottom of the multi-flight staircase formwork support can be varied according to different multi-flight staircase construction requirements.
[0036] The support method of this embodiment can solve the problem that the formwork support frame of the uppermost run of a three-run or higher staircase cannot be directly placed on the formwork of the lowermost run, thus shortening the construction period, reducing construction costs, and improving the safety and stability of the formwork support frame.
[0037] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A prefabricated support frame at the bottom of a multi-flight staircase formwork support, characterized in that, The system includes longitudinal reinforcing bars, transverse reinforcing bars, a first concrete block, and a second concrete block. The longitudinal reinforcing bars include an inclined section, a first horizontal section, and a second horizontal section. The first and second horizontal sections are respectively connected to the two ends of the inclined section and extend in opposite directions. A first concrete block is fixedly threaded through the inclined section, and a second concrete block is fixedly threaded through both the first and second horizontal sections. The top surfaces of the first and second concrete blocks are planar structures, the bottom surface of the first concrete block is an inclined slope structure, and the bottom surface of the second concrete block is a horizontal planar structure. Multiple sets of longitudinal reinforcing bars are arranged side by side at intervals in the left-right direction. Transverse reinforcing bars are fixedly threaded through multiple first concrete blocks located in the same horizontal direction within the multiple sets of longitudinal reinforcing bars.
2. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to claim 1, characterized in that, The bottom surfaces of all first concrete blocks are located on the same inclined plane, the bottom surfaces of all second concrete blocks on the first horizontal segment are located on the same plane, and the bottom surfaces of all second concrete blocks on the second horizontal segment are located on the same horizontal plane.
3. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to claim 1, characterized in that, The longitudinal reinforcement group includes two longitudinal reinforcement bars arranged parallel to each other, and the transverse reinforcement bar passes between the two longitudinal reinforcement bars of the longitudinal reinforcement group.
4. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to claim 3, characterized in that, One end of the longitudinal reinforcing bar is detachably connected to a first vertical steel pipe connector via a threaded sleeve, and the other end of the longitudinal reinforcing bar is detachably connected to a horizontal fastening screw via a threaded sleeve.
5. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to claim 4, characterized in that, A horizontal steel pipe connector is detachably connected to the horizontal fastening screw.
6. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to claim 5, characterized in that, The first vertical steel pipe connector includes a first screw and a first clamp. The first screw is welded to the outer wall of the first clamp and is arranged perpendicular to the central axis of the first clamp. The first screw is threaded into the corresponding threaded sleeve.
7. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to any one of claims 1 to 6, characterized in that, The two ends of the transverse reinforcing bar are detachably connected to a second vertical steel pipe connector via threaded sleeves; the second vertical steel pipe connector includes a second screw and a second clamp, the second screw is welded to the outer wall of the second clamp and arranged perpendicular to the central axis of the second clamp, and the second screw is threadedly connected to the corresponding threaded sleeve.
8. The prefabricated support frame at the bottom of a multi-flight staircase formwork support according to any one of claims 1 to 6, characterized in that, Both the first and second concrete blocks are hexahedral structures, and the second concrete block is an inverted frustum pyramid structure.
9. A support method using a prefabricated support frame at the bottom of a multi-flight staircase formwork support as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Make molds for the first and second concrete blocks, place the inclined sections of the longitudinal reinforcement groups and the transverse reinforcements in the mold of the first concrete block, and place the first and second horizontal sections of the longitudinal reinforcement groups in the mold of the second concrete block. Then pour the first and second concrete blocks and cure them. Pour the required first and second concrete blocks according to the number of longitudinal reinforcement groups and the number of transverse reinforcements. Once all the first and second concrete blocks that have been poured have reached the set strength, the prefabricated support frame at the bottom of the entire multi-flight staircase formwork support is completed. S2, hoist the prefabricated support frame at the bottom of the multi-run staircase formwork support into the lower run staircase formwork that has been tied with the bottom and top layer steel bars, and then tie the prefabricated support frame at the bottom of the multi-run staircase formwork support to the bottom and top layer steel bars of the lower run staircase formwork. S3, install a first vertical steel pipe connector and a horizontal steel pipe connector at both ends of the longitudinal steel bar group, and install a second vertical steel pipe connector at both ends of the transverse steel bar. According to the position of the transverse steel bar and the longitudinal steel bar group, make holes in the lower run stair formwork so that the two ends of the transverse steel bar pass through the corresponding holes and are connected and fixed to the vertical steel pipe of the lower run stair formwork support through the second vertical steel pipe connector. So that the two ends of the longitudinal steel bar group pass through the corresponding holes and are connected to the pre-embedded steel pipe in the lower run stair formwork and the horizontal steel pipe of the lower run stair formwork support through the first vertical steel pipe connector and the horizontal steel pipe of the lower run stair formwork support, respectively. S4, the horizontal steel pipes connected to the horizontal steel pipe connectors of a set of longitudinal steel bars are connected and fixed by cross fasteners, and the cross fasteners are also connected and fixed to the vertical steel pipes of the lower run stair formwork support; S5, erect the upper run stair formwork support on the precast support frame at the bottom of the multi-run stair formwork support, so that the upper run stair formwork support is supported on the top surface of the first concrete block and the top surface of the second concrete block, and tie the upper run stair formwork support to the lower run stair formwork support for fixation. S6. After the upper staircase formwork support is erected, the upper staircase formwork is erected using the upper staircase formwork support. The multi-run staircase formwork is erected and then cast in one go in the multi-run staircase formwork.
10. The support method according to claim 9, characterized in that, In S6, when the multi-flight staircase is a three-flight staircase, the lower flight staircase formwork support is the bottommost first flight staircase formwork support, the upper flight staircase formwork support is the topmost third flight staircase formwork support, and the middle second flight staircase formwork support and the lower flight staircase formwork support are both supported on the lower floor of the already poured concrete floor or the ground. When the multi-flight staircase is a four-flight staircase, two prefabricated support frames for the bottom of the multi-flight staircase formwork support are required. The lower flight staircase formwork support is either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The prefabricated support frames for the bottom of the multi-flight staircase formwork support are installed on either the bottommost first flight staircase formwork support or the middle second flight staircase formwork support. The upper flight staircase formwork support is either the third flight staircase formwork support or the topmost fourth flight staircase formwork support. The third flight staircase formwork support is supported on the prefabricated support frames for the bottom of the multi-flight staircase formwork support of the first flight staircase formwork support. The fourth flight staircase formwork support is supported on the prefabricated support frames for the bottom of the multi-flight staircase formwork support of the second flight staircase formwork support. Both the second flight staircase formwork support and the lower flight staircase formwork support are supported on the lower floor or ground where concrete has already been poured.