Large-span beam plate formwork support square steel pipe keel lengthening structure
By using U-shaped groove connectors to connect square steel pipe keels, the problem of low overlap rate of square steel pipe keels in large-span beam and slab formwork support systems was solved, achieving higher utilization rate and better construction quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE THIRD CONSTR ENG CO LTD OF CHINA CONSTR SECOND ENG BUREAU
- Filing Date
- 2025-07-30
- Publication Date
- 2026-08-04
AI Technical Summary
In existing technologies, the overlapping method of square steel tube keel in the formwork support system of large-span beams and slabs reduces the utilization rate, leads to increased costs, and may cause uneven spacing and local collapse, affecting the construction quality.
The first and second square steel pipe keels are fixedly connected by U-shaped groove connectors through positioning holes and fastening bolts, achieving butt joint rather than lap joint, which enhances the utilization rate and integrity of the keel.
It improves the utilization rate of square steel pipe keel, reduces production costs, and enhances the forming quality and construction safety of concrete structures.
Smart Images
Figure CN224591797U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building formwork technology, and in particular to a structural extension structure for square steel pipe keel supporting large-span beam and slab formwork. Background Technology
[0002] In formwork support systems for building construction, square steel tubes (rectangular tubes) are commonly used as the main joists to transfer loads from concrete beams and slabs, formwork, and secondary joists. However, standard square steel tubes are typically 6m in length, requiring overlapping for large-span beams and slabs. To ensure the effective overlap length of the main joists, traditional methods often involve overlapping by at least one span (the span of the formwork support) to guarantee the safety of the formwork support system.
[0003] This process reduces the actual utilization rate of square steel pipes, which is not conducive to project cost control. Moreover, short steel pipes are more susceptible to disturbance. In areas where the construction live load varies greatly, the actual spacing of the main keel of the square steel pipe often does not match the calculation in the scheme, affecting the beam and slab forming quality, and may even cause local collapse of the formwork support system. Utility Model Content
[0004] In order to overcome the problems existing in the prior art, this utility model provides a large-span beam and slab formwork support square steel pipe keel extension structure.
[0005] A structural extension structure for square steel pipe keel supporting large-span beam and slab formwork includes a first square steel pipe keel, a second square steel pipe keel, and connectors. Along the length of the large-span beam and slab, the first and second square steel pipe keels are fixedly connected by the connectors. The first square steel pipe keel has a first threaded through hole, and the second square steel pipe keel has a second threaded through hole. The connector is a U-shaped groove, with two pairs of positioning holes symmetrically positioned at both ends of the two wings of the U-shaped groove. The two pairs of positioning holes include a first pair of positioning holes and a second pair of positioning holes. The first square steel pipe keel is inserted into the U-shaped groove from one end, with the first threaded hole aligned with the first pair of positioning holes. The second square steel pipe keel is inserted into the U-shaped groove from the other end, with the second threaded hole aligned with the second positioning hole. A first fastening bolt passes through the first threaded hole and is fixedly connected to one end of the U-shaped groove via the first pair of positioning holes. A second fastening bolt passes through the second threaded hole and is fixedly connected to the other end of the U-shaped groove via the second pair of positioning holes.
[0006] Furthermore, the U-shaped groove is made of bent steel plate, and the two pairs of positioning holes are elliptical elongated holes.
[0007] Furthermore, the length of the U-shaped groove is 400-600mm, and the length of the elliptical elongated hole is 130-150mm.
[0008] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model enables the square steel pipe keel in the formwork support to be connected and lengthened through the U-shaped groove connector, which improves the utilization rate of the square steel pipe keel and is conducive to project cost management; and by connecting and lengthening the square steel pipe keel, the integrity of the formwork support system is enhanced and the forming quality of the concrete structure is improved. Attached Figure Description
[0009] Figure 1 This is a three-dimensional schematic diagram of a large-span beam and slab formwork support square steel pipe keel extension structure according to the present invention;
[0010] Figure 2 This is a cross-sectional view of a large-span beam and slab formwork support square steel pipe keel extension structure according to this utility model.
[0011] Explanation of symbols in the attached diagram:
[0012] 1. U-shaped groove, 11. First pair of positioning holes, 12. Second pair of positioning holes, 13. First fastening screw, 14. Second fastening bolt, 2. First square steel pipe keel, 21. First threaded through hole, 3. Second square steel pipe keel. Detailed Implementation
[0013] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0014] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0015] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0016] In the description of this patent, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0017] A type of square steel pipe keel splicing structure for large-span beam and slab formwork support, such as... Figures 1 to 2 As shown, the structure includes a first square steel pipe keel 2, a second square steel pipe keel 3, and connectors. Along the length of the large-span beam, the first square steel pipe keel 2 and the second square steel pipe keel 3 are fixedly connected by connectors. The first square steel pipe keel 2 is provided with a first threaded through hole 21, and the second square steel pipe keel 3 is provided with a second threaded through hole. The connector is a U-shaped groove 1. Two pairs of positioning holes are symmetrically positioned at both ends of the two wings of the U-shaped groove 1. The two pairs of positioning holes include a first pair of positioning holes 11 and a second pair of positioning holes 12. The first square steel pipe... The keel 2 is inserted into the U-shaped groove 1 from one end, with the first threaded through hole 21 aligned with the first pair of positioning holes 11. The second square steel pipe keel 3 is inserted into the U-shaped groove 1 from the other end, with the second threaded through hole aligned with the second positioning hole 12. The first fastening screw 13 passes through the first threaded hole and is fixedly connected to one end of the first square steel pipe keel 2 and the U-shaped groove 11. The second fastening bolt 14 passes through the second threaded through hole and is fixedly connected to the other end of the second square steel pipe keel 3 and the U-shaped groove 12.
[0018] In large-span beam and slab formwork support systems, due to the great length of the beams and slabs, it is difficult to find square steel pipes of equal length to serve as the keel in the formwork support system, matching the length of the beams and slabs. Therefore, to ensure the effective overlap length of the main square steel pipe keel, traditional processes often overlap at least one span (the span of the formwork support) to ensure the safety of the formwork support system. However, this existing method of overlapping square steel pipe keels reduces the actual utilization rate of square steel pipes and increases production costs. Furthermore, the different overlap positions of multiple square steel pipe keels will cause the uniform spacing between them to become uneven. That is, due to the difference in the upper and lower positions of the overlapping square steel pipe keels, it is easy to produce narrow and wide spacing, rather than uniformly spaced multiple overlapping square steel pipe keels; among the two square steel pipe keels with overlapping lengths, the shorter square steel pipe keel is more easily disturbed. Therefore, in areas with large variations in construction load, both the shorter steel pipe keel and the uneven spacing may cause local collapse of the formwork support. Therefore, the use of U-shaped groove 1 connectors enables the butt jointing of square steel pipe keels, rather than overlapping, thereby improving the utilization rate of square steel pipe keels and reducing production costs. Furthermore, using U-shaped groove 1 connectors to connect two square steel pipe keels avoids uneven spacing between multiple square steel pipe keels, enhancing the integrity of the formwork support system, improving the forming quality of the concrete structure, and enhancing the overall construction quality of the project.
[0019] Furthermore, such as Figures 1 to 2 As shown, the U-shaped groove 1 is made of bent steel plate, and both the first pair of positioning holes 11 and the second pair of positioning holes 12 are elliptical elongated holes. The first pair of positioning holes 11 and the second pair of positioning holes 12 are elliptical elongated holes to accommodate the difference between the designed length of the square steel pipe keel and the actual length of the square steel pipe keel during construction.
[0020] Furthermore, such as Figures 1 to 2 As shown, the length of the U-shaped groove 1 is 400-600mm, and the length of the elliptical elongated hole is 130-150mm. Based on multiple U-shaped groove butt joint tests between the first square steel pipe keel 2 and the second square steel pipe keel 3, it was found that a U-shaped groove length of 400-600mm reasonably enhances the butt joint strength between the first square steel pipe keel 2 and the second square steel pipe keel 3. The selection of the elliptical elongated hole length range is to accommodate the difference between the designed length of the square steel pipe keel in the template support system and the required length of the square steel pipe keel in the actual project.
[0021] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.
Claims
1. A large-span beam-slab formwork support square steel pipe keel lengthening structure, characterized by, The structure includes a first square steel pipe keel (2), a second square steel pipe keel (3), and connectors. Along the length of the large-span beam, the first square steel pipe keel (2) and the second square steel pipe keel (3) are fixedly connected by connectors. The first square steel pipe keel (2) is provided with a first threaded through hole (21), and the second square steel pipe keel (3) is provided with a second threaded through hole. The connector is a U-shaped groove (1). Two pairs of positioning holes are symmetrically provided at both ends of the two wings of the U-shaped groove (1). The two pairs of positioning holes include a first pair of positioning holes (11) and a second pair of positioning holes (12). The first square steel pipe keel (2) is connected from... One end of the U-shaped groove (1) is inserted into the U-shaped groove (1), the first threaded through hole (21) is aligned with the first pair of positioning holes (11), the second square steel pipe keel (3) is inserted into the U-shaped groove (1) from the other end of the U-shaped groove, the second threaded through hole is aligned with the second positioning hole (12), the first fastening screw (13) passes through the first threaded hole and the first pair of positioning holes (11) to fix the first square steel pipe keel (2) to one end of the U-shaped groove (1), and the second fastening bolt (14) passes through the second threaded through hole and the second pair of positioning holes (12) to fix the second square steel pipe keel (3) to the other end of the U-shaped groove (1).
2. The long-span beam-slab formwork support square steel tube keel lengthening structure according to claim 1, characterized in that, The U-shaped groove (1) is made of bent steel plate, and the first pair of positioning holes (11) and the second pair of positioning holes (12) are both elliptical elongated holes.
3. The large-span beam and slab formwork support square steel pipe keel extension structure according to claim 2, characterized in that, The length of the U-shaped groove (1) is 400-600mm, and the length of the elliptical elongated hole is 130-150mm.