Square frame secondary keel
By designing the square subkeleton structure, the problems of uneven stress, easy corrosion and high construction costs of the subkeleton are solved, and uniform distribution of stress and improvement of construction efficiency are achieved, ensuring construction safety and concrete structure quality.
Patent Information
- Application Number
- CN202422320745.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The existing secondary keels have problems such as uneven stress, difficulty in controlling spacing, easy corrosion and damage, and high construction costs in concrete construction.
The frame subkeleton structure consisting of a square tube subkeleton body and a spacer sleeve arranged parallel to each other is adopted. The design of connecting holes, connecting bolts and removable rubber plugs ensures uniform distribution of the force, and improves stability through the connection between the joint and the pin latch.
It improves the stress capacity and construction safety of the subkeleton, reduces the overall weight and construction cost, improves construction efficiency, and ensures the plaster-free quality of the concrete structure.
Smart Images
Figure CN223256465U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of turnover material equipment in formwork engineering in building construction, and specifically to a square frame secondary keel. Background Art
[0002] Concrete building construction begins with the construction of pouring formwork. Traditional wooden formwork is typically used during this process, requiring secondary studs to support the floor, beam, and wall forms. These secondary studs are typically 2-, 3-, or 4-meter-long wooden planks. These planks are prone to significant saw marks and can be further damaged by falling during rough formwork removal, particularly when dismantling tall, large formwork. Furthermore, the planks are susceptible to water ingress during use. If left unused for more than three months, more than one-third of these planks will become unusable due to corrosion. If left unused for more than six months, the majority will become unusable due to corrosion. Some construction sites also use square tubes made from Ø48 steel pipe as secondary studs, except for the joints between formwork. These square tubes are installed individually, with varying spacing between them, making it difficult to control. Consequently, it's common for the spacing between adjacent planks to differ by 100mm. Therefore, the general spacing between existing secondary purlins is more than 200mm, and the largest can even exceed 300mm. This makes the overall stress and safety of the secondary purlins and the molding quality of the concrete structure uncontrollable, and also causes the amortization and use costs of traditional secondary purlins and the installation, dismantling and transportation costs to be high. Utility Model Content
[0003] In response to the shortcomings of the existing technology, the present application provides a square secondary purlin, which can not only effectively improve the load-bearing capacity of the secondary purlin, but also enable the secondary purlin to better distribute the load, while also greatly reducing the overall weight of the secondary purlin, effectively ensuring the safety of construction, improving construction efficiency, reducing construction costs, and better allowing the concrete structure to achieve plaster-free quality.
[0004] A square frame secondary keel comprises a secondary keel portion and a spacer portion arranged on the secondary keel portion; the secondary keel portion is composed of two or three square tube secondary keel bodies arranged parallel to each other.
[0005] Preferably, the square tube secondary keel body is provided with a plurality of connection holes which pass through the square tube secondary keel body transversely; the center axis spacing between any two adjacent connection holes is 50 mm, and the center axis spacing between the connection hole closest to the end of the square tube secondary keel body and the end of the square tube secondary keel body is 42.5 mm; the cross-sectional size of the square tube secondary keel body is 30 mm × 50 mm.
[0006] Furthermore, the spacer portion is composed of a spacer sleeve arranged between any two adjacent square tube secondary keel bodies, and a connecting bolt that simultaneously and transversely penetrates all the square tube secondary keel bodies and the spacer sleeve; at least two spacer sleeves are arranged between any two adjacent square tube secondary keel bodies.
[0007] The end of the square tube secondary keel body is also provided with a detachable rubber plug.
[0008] As a preferred embodiment, when the secondary keel portion is arranged horizontally, a joint portion is further provided between any two square tube secondary keel bodies connected end to end; the joint portion is composed of a spacer block, an inserted square tube arranged at the front and rear ends of the spacer block and having a size matching the square tube secondary keel body, a number of pins that pass through the inserted square tube laterally, and a pin that cooperates with the pin.
[0009] Preferably, the cross-sectional dimensions of the spacer block are 25.4 mm×45.4 mm, and the length of the spacer block is 15 mm; the insert square tube is provided with a plurality of fixing holes matching the connecting holes; each insert square tube is provided with at least two fixing holes.
[0010] As another preferred embodiment, the connecting parts of any two square tube secondary keel bodies connected end to end are arranged in parallel, and the connecting holes on the two square tube secondary keel bodies are simultaneously penetrated by pins, and the pins are fixed by plugs; the number of the pins is at least two.
[0011] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0012] The utility model can not only effectively improve the load-bearing capacity of the secondary keel, but also enable the secondary keel to better distribute the load, and at the same time can well reduce the overall weight of the secondary keel, effectively ensure the safety of construction, improve the efficiency of construction, reduce the construction cost, and better enable the concrete structure to achieve the quality of not requiring plastering.
[0013] Some additional features of the present application may be described in the following description. Some additional features of the present application will be apparent to those skilled in the art from an inspection of the following description and accompanying drawings, or from a thorough understanding of the production or operation of the embodiments. The features disclosed in this application may be realized and achieved through the practice or use of the various methods, means, and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numerals represent the same components.
[0015] Figure 1 This is a structural diagram of the double-tube square frame secondary keel of the utility model.
[0016] Figure 2 This is a structural diagram of the three-tube square frame secondary keel of the utility model.
[0017] Figure 3 This is a structural diagram of the first connection method of the square frame secondary keel of the utility model.
[0018] Figure 4 This is a structural diagram of the second connection method of the square frame secondary keel of the utility model.
[0019] Description of reference numerals:
[0020] 100. Secondary keel; 101. Square tube body; 102. Connecting hole; 103. Rubber plug; 200. Spacer; 201. Spacer sleeve; 202. Connecting bolt; 300. Joint; 301. Spacer block; 302. Insert square tube; 303. Pin; 304. Latch. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.
[0022] It should be noted that, if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0023] In this application, when terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "center," "vertical," "horizontal," "transverse," and "longitudinal" are used, the orientations or positional relationships they indicate are based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.
[0024] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0025] Furthermore, in this application, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0027] Example 1
[0028] like Figure 1 、 2 As shown, a square frame secondary keel includes a secondary keel portion 100 and a spacer portion 200 arranged on the secondary keel portion 100; the secondary keel portion 100 is composed of two or three square tube secondary keel bodies 101 arranged parallel to each other.
[0029] The square tube secondary keel body 101 is provided with a plurality of connection holes 102 that pass through the square tube secondary keel body 101 transversely; the center axis spacing between any two adjacent connection holes 102 is 50 mm, and the center axis spacing between the connection hole 102 closest to the end of the square tube secondary keel body 101 and the end of the square tube secondary keel body 101 is 42.5 mm; the cross-sectional dimensions of the square tube secondary keel body 101 are 30 mm × 50 mm.
[0030] The spacer portion 200 is composed of a spacer sleeve 201 arranged between any two adjacent square tube secondary keel bodies 101, and a connecting bolt 202 that simultaneously and transversely penetrates all the square tube secondary keel bodies 101 and the spacer sleeve 201; at least two spacer sleeves 201 are arranged between any two adjacent square tube secondary keel bodies 101.
[0031] The length of the spacer sleeve is 160mm or 200mm. When the spacer sleeve is set between two adjacent square tube secondary keels, the optimal setting position of the spacer sleeve is the middle section of the square tube secondary keel.
[0032] A detachable rubber plug 103 is further provided at the end of the square tube secondary keel body 101 .
[0033] Example 2
[0034] like Figure 3 As shown, when the secondary keel portion 100 is arranged horizontally, a joint portion 300 is further provided between any two of the square tube secondary keel bodies 101 connected end to end; the joint portion 300 is composed of a spacer block 301, an inserted square tube 302 arranged at the front and rear ends of the spacer block 301 and having a size matching that of the square tube secondary keel body 101, a plurality of pins 303 that pass through the inserted square tube 302 laterally, and a pin 304 that cooperates with the pin 303.
[0035] The cross-sectional dimensions of the spacer block 301 are 25.4 mm×45.4 mm, and the length of the spacer block 301 is 15 mm. The insert square tube 302 is provided with a plurality of fixing holes that match the connecting holes 102 . Each insert square tube 302 is provided with at least two fixing holes.
[0036] During laying, this embodiment is mainly used for supporting beam formwork and floor formwork. When the distance between the secondary purlin part and the adjacent strip supporting secondary purlin or the edge of the beam formwork or the edge of the floor formwork is greater than 200 mm, a supplementary secondary purlin can be separately set at the center position of the distance to further rationally distribute the force of the entire secondary purlin structure, effectively avoiding the deformation or even damage of some square secondary purlins caused by uneven force.
[0037] Example 3
[0038] like Figure 4 As shown, the connecting parts of any two square tube secondary keel bodies 101 connected end to end are arranged in parallel, and the connecting holes 102 on the two square tube secondary keel bodies 101 are penetrated by pins 303 at the same time, and the pins 303 are fixed by plugs 304; the number of the pins 303 is at least two.
[0039] When connected vertically, using the method of Example 2 would significantly increase the force applied to the ends and joints of the square tube secondary keel due to the lever effect, easily leading to deformation of the square tube secondary keel and joints. However, using the front-end parallel connection method effectively distributes the force, further reducing the chance of deformation of the square tube secondary keel, and significantly improving the product's stability and service life.
[0040] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.
[0041] In addition, the above-mentioned specific embodiments are merely illustrative. Those skilled in the art may devise various solutions based on the disclosure of this utility model, and such solutions fall within the scope of disclosure and the scope of protection of this utility model. Those skilled in the art should understand that the specification and drawings of this utility model are illustrative and do not constitute limitations of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.
Claims
1. A square frame secondary keel, characterized in that: It comprises a secondary keel portion (100) and a spacer portion (200) arranged on the secondary keel portion (100); the secondary keel portion (100) is composed of two or three square tube secondary keel bodies (101) arranged parallel to each other.
2. A square frame secondary keel according to claim 1, characterized in that: The square tube secondary keel body (101) is provided with a plurality of connection holes (102) that pass through the square tube secondary keel body (101) transversely; the center axis spacing between any two adjacent connection holes (102) is 50 mm, and the center axis spacing between the connection hole (102) closest to the end of the square tube secondary keel body (101) and the end of the square tube secondary keel body (101) is 42.5 mm; the cross-sectional dimensions of the square tube secondary keel body (101) are 30 mm×50 mm.
3. A square frame secondary keel according to claim 2, characterized in that: The spacer (200) is composed of a spacer sleeve (201) arranged between any two adjacent square tube secondary keel bodies (101), and a connecting bolt (202) that simultaneously and transversely penetrates all the square tube secondary keel bodies (101) and the spacer sleeve (201); at least two spacer sleeves (201) are arranged between any two adjacent square tube secondary keel bodies (101).
4. A square frame secondary keel according to claim 3, characterized in that: The end of the square tube secondary keel body (101) is also provided with a detachable rubber plug (103).
5. The square frame secondary keel according to claim 4, characterized in that: When the secondary keel portion (100) is arranged horizontally, a joint portion (300) is further arranged between any two square tube secondary keel bodies (101) connected end to end; the joint portion (300) is composed of a spacer block (301), an inserting square tube (302) arranged at the front and rear ends of the spacer block (301) and having a size matching that of the square tube secondary keel body (101), a plurality of pins (303) that pass through the inserting square tube (302) transversely, and a latch (304) that matches the pin (303).
6. The square frame secondary keel according to claim 5, characterized in that: The cross-sectional dimensions of the spacer block (301) are 25.4 mm×45.4 mm, and the length of the spacer block (301) is 15 mm; the insert square tube (302) is provided with a plurality of fixing holes matching the connection holes (102); and each insert square tube (302) is provided with at least two fixing holes.
7. The square frame secondary keel according to claim 4, characterized in that: When the secondary keel portion (100) is arranged vertically, the connecting parts of any two square tube secondary keel bodies (101) connected end to end are arranged in parallel, and the connecting holes (102) on the two square tube secondary keel bodies (101) are simultaneously penetrated by pins (303), and the pins (303) are fixed by plugs (304); the number of the pins (303) is at least two.