A general formwork device and method for precasting a concrete box girder component

Abstract

The application discloses a kind of general formwork devices and methods of concrete box girder component prefabrication, it is related to concrete box girder prefabrication technical field, including: pedestal, formwork assembly, formwork assembly is arranged around pedestal week side, to form the forming cavity of prefabricated concrete box girder component in the upper portion of pedestal is enclosed;Beam height adjusting pedestal, beam height adjusting pedestal is detachably arranged in the bottom of forming cavity and is stacked on the upper end of pedestal, to adjust the beam height of prefabricated concrete box girder component by reducing the height of forming cavity.The application can realize the prefabrication of different models of concrete box girder component, without replacing side formwork and without carrying out the splicing of bottom pedestal width, and has the characteristics of simple structure, convenient and efficient construction.

Description

Technical Field

[0001] This invention relates to the field of precast concrete box girder technology, and in particular to a universal formwork device and method for precast concrete box girder components. Background Technology

[0002] Currently, in the design of traditional concrete box girder components, the slope K of the two webs (i.e., side formwork) is relatively fixed. As the height H of the box girder component increases, its bottom width B decreases. The traditional process involves prefabricating two or more concrete box girder components with different heights, such as H1 and H2. Corresponding side formwork one and side formwork two are required for each. If the bottom platform width is arranged as B1, side formwork two can be used to prefabricate the corresponding H2-height concrete box girder component. When prefabricating a H1-height concrete box girder component, the side of the bottom platform needs to be widened or reduced by B to meet the specification requirement of a B2 width. Only with side formwork one can the H1-height concrete box girder component be cast. The two types of concrete box girder components achieve their corresponding beam section shaping by widening or reducing the bottom platform by B. Therefore, when the beam type changes, the pedestal needs to be widened or narrowed frequently, which is labor-intensive and time-consuming. In particular, the bottom of the beam with a pedestal width of B2 will have an additional seam, making it difficult to guarantee the appearance quality and increasing the economic investment in the outer formwork.

[0003] Therefore, how to provide a universal formwork device and method for prefabricating concrete box girder components, which can realize the prefabrication of different types of concrete box girder components without replacing the side formwork or splicing the bottom platform width, and has the characteristics of simple structure, convenient and efficient construction, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention proposes a universal formwork device and method for prefabricating concrete box girder components, aiming to solve the technical problems of poor universality, inconvenient construction, and difficulty in quality control of traditional prefabricated formwork devices for concrete box girder components.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] One aspect of the present invention provides a universal formwork device for prefabrication of concrete box girder components, comprising:

[0007] pedestal,

[0008] A template assembly is arranged around the periphery of the platform to enclose and form a molding cavity for a precast concrete box girder component above the platform;

[0009] A beam height adjustment platform is detachably arranged at the bottom of the forming cavity and stacked on top of the platform to adjust the beam height of the precast concrete box girder component by reducing the height of the forming cavity.

[0010] This invention provides a universal formwork device for precast concrete box girder components. During use, the device can be arranged according to the beam height model of the precast concrete box girder component. The beam height adjustment platform can be removed, and the forming cavity formed by the platform and the formwork assembly can be used to cast precast concrete box girder components with a larger beam height. Alternatively, stacking the beam height adjustment platform on top of the platform can reduce the inner height of the forming cavity, thereby allowing the casting of precast concrete box girder components with a smaller beam height. In other words, by stacking the beam height adjustment platform, the beam height of the precast concrete box girder component can be flexibly adjusted as needed. The side formwork of this device is suitable for different beam height models, eliminating the need for repeated disassembly and replacement of the side formwork and widening or narrowing of the platform. It is highly versatile, economical, practical, produces high-quality beam appearance, and is convenient to construct.

[0011] As a further improvement to the above technical solution, the pedestal includes a base and a bottom template, with the bottom template fixed to the upper surface of the base.

[0012] As a further improvement to the above technical solution, the template assembly includes side templates and head templates, and there are two side templates and two head templates; the two side templates are symmetrically arranged at both ends of the platform in the width direction, and the two head templates are symmetrically arranged at both ends of the platform in the length direction.

[0013] The periphery of the beam height adjustment platform abuts against the inner wall of the side template and the end template.

[0014] The beneficial effects of the above technical solution are: the pedestal supports the beam height adjustment pedestal, and the side formwork and end formwork limit the periphery of the beam height adjustment pedestal.

[0015] As a further improvement to the above technical solution, it also includes arc-shaped corner pieces, which are multiple in number and arranged along the length of the platform. They are detachably connected to the top surfaces of the platform and the beam height adjustment platform and are sealed to the inner wall surfaces of the corresponding side templates.

[0016] The beneficial effects of the above technical solution are: the arc corner piece can play a sealing role between the platform, the beam height adjustment platform and the side formwork; and the setting of the arc corner piece can form a forming cavity for the concrete box girder component with a standard cross section, so that the bottom end of the cast concrete box girder component has the required rounded chamfer structure.

[0017] As a further improvement to the above technical solution, the bottom of the beam height adjustment platform has a clearance structure on both sides corresponding to the width direction to avoid the arc corner piece.

[0018] The beneficial effects of the above technical solution are: the purpose of setting the avoidance structure at the bottom of the beam height adjustment platform is to avoid interference with the arc corner piece at the top of the platform when the beam height adjustment platform is stacked on top of the platform, so as to achieve the technical effect of quick construction.

[0019] As a further improvement to the above technical solution, the avoidance structure is an arc-shaped chamfer that is adapted to the arc-shaped corner piece.

[0020] As a further improvement to the above technical solution, there are multiple beam height adjustment platforms, which are stacked sequentially along the height direction of the forming cavity; and the two ends of the width direction of the multiple beam height adjustment platforms abut against the inner wall surface of the corresponding side template, and the two ends of the length direction abut against the inner wall surface of the corresponding end template.

[0021] The beneficial effects of the above technical solution are: multiple beam height adjustment platforms of different height specifications can be replaced or stacked to meet the needs of adjusting the beam height of precast concrete box girder components, further increasing the versatility of the device and improving the convenience of construction.

[0022] Another aspect of the present invention provides a method for prefabricating concrete box girder components, including the aforementioned universal formwork device for prefabricating concrete box girder components, comprising the following steps:

[0023] Step 1: Set up the pedestal;

[0024] Step 2: Arrange template components around the pedestal to form a molding cavity above the pedestal; pour concrete into the molding cavity to create a concrete box girder component with a certain beam height.

[0025] As a further improvement to the above technical solution, step three is also included: when it is necessary to prefabricate concrete box girder components of different beam heights, a beam height adjustment platform with a preset height is placed in the molding cavity and stacked on the top of the platform to adjust the inner height of the molding cavity, and concrete is poured in the molding cavity to produce concrete box girder components that meet the requirements of different beam heights.

[0026] As a further improvement to the above technical solution, curved corner pieces are installed on both sides of the top surface of the pedestal and / or the beam height adjustment pedestal in the width direction; the bottom surface of the curved corner pieces is bonded and sealed to the top surface of the pedestal and / or the beam height adjustment pedestal, and the curved corner pieces are sealed against the inner wall surface of the corresponding template assembly to form a molding cavity for a precast concrete box girder component with a standard cross section.

[0027] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a universal formwork device for prefabricated concrete box girder components, which has the following advantages and beneficial effects:

[0028] 1. The side formwork of the present invention is universal, and there is no need to change the side formwork when casting concrete box girder components of different beam heights, which saves time and effort and is convenient for construction.

[0029] 2. The device of the present invention is highly versatile, economical and practical; the beam height parameters can be flexibly adjusted by replacing beam height adjustment platforms of different specifications or stacking multiple beam height adjustment platforms as needed, so as to be suitable for prefabricated concrete box girder components of different beam height models; and the appearance quality of the concrete box girder is good, especially for platforms with local settlement, it helps to eliminate misalignment and significantly improves the appearance quality. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 A schematic diagram of a universal formwork device for prefabrication of concrete box girder components according to the present invention;

[0032] Figure 2 A schematic diagram of the beam height adjustment platform of a universal precast formwork device for concrete box girder components according to the present invention;

[0033] Figure 3 A schematic diagram of the arc-shaped corner component structure of a universal prefabrication template device for concrete box girder components according to the present invention;

[0034] Figure 4 Schematic diagram of precast formwork device for conventional concrete box girder components;

[0035] Figure 5 Schematic diagram of the widened precast formwork platform for conventional concrete box girder components;

[0036] Figure 6 A schematic diagram of the beam height adjustment platform structure of a universal prefabrication formwork device for concrete box girder components according to the present invention;

[0037] In the diagram: 1. Platform; 11. Widened platform; 2. Template assembly; 21. Side template; 22. Template support; 23. Forming cavity; 3. Beam height adjustment platform; 31. Curved chamfer; 4. Corner component. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "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.

[0040] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] 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 mechanical connection or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] like Figures 1 to 3 As shown, a universal formwork device for prefabrication of concrete box girder components includes:

[0043] The platform 1 is horizontally arranged and can be fixed on the ground during use. The platform 1 is strip-shaped and the cross-section in the vertical length direction is trapezoidal.

[0044] Template component 2 is arranged around the pedestal 1 to enclose and form a molding cavity 23 for the precast concrete box girder component above the pedestal 1.

[0045] The beam height adjustment platform 3 is detachably arranged at the bottom of the forming cavity 23 and stacked on the top of the platform 1, so as to adjust the beam height of the precast concrete box girder component by reducing the height of the forming cavity 23.

[0046] This embodiment provides a universal formwork device for precast concrete box girder components. During use, the device can be arranged according to the beam height model of the precast concrete box girder component. The beam height adjustment platform 3 can be removed, and the forming cavity formed by the platform 1 and the formwork assembly 2 can be used to cast precast concrete box girder components with a larger beam height. By stacking the beam height adjustment platform 3 on top of the platform 1, the inner height of the forming cavity 23 can be reduced, thereby allowing the casting of precast concrete box girder components with a smaller beam height. In other words, by stacking the beam height adjustment platform 3, the beam height of the precast concrete box girder component can be flexibly adjusted as needed. The side formwork of this device is suitable for different beam height models, eliminating the need for repeated disassembly and replacement of the side formwork and widening or narrowing of the platform. It is highly versatile, economical, practical, produces a good beam appearance quality, and is convenient to construct.

[0047] In some embodiments, the pedestal 1 includes a base and a bottom template, the bottom template being fixed to the upper end face of the base.

[0048] In some embodiments, the template assembly 2 includes two side templates 21 and two end templates (not shown in the figure). The two side templates 21 are symmetrically arranged on both sides of the platform 1 in the width direction, and the two end templates are symmetrically arranged on both sides of the platform 1 in the length direction, so as to enclose and form the forming cavity 23 of the precast concrete box girder component.

[0049] The periphery of the beam height adjustment platform 3 is adapted to and fits against the inner wall of the side template 21 and the end template, so as to reduce the height of the inner cavity of the molding cavity 23 by filling the bottom space of the molding cavity 23.

[0050] The pedestal 1 serves to support the beam height adjustment pedestal 3, while the side formwork 21 and the end formwork limit the periphery of the beam height adjustment pedestal 3.

[0051] In some embodiments, the platform 1 and the beam height adjustment platform 3 are detachably connected to the top surfaces on both sides of the corresponding width direction. The arc corner 4 is arranged along the length direction of the platform 1, and the side end of the arc corner 4 near the corresponding side template 21 is tightly fitted and sealed with the inner wall surface of the corresponding side template 21 to prevent grout leakage during pouring.

[0052] The arc corner piece 4 can serve as a seal between the platform 1, the beam height adjustment platform 3 and the side formwork 21; and the arc corner piece 4 can form a forming cavity for the concrete box girder component with a standard cross section, so that the bottom end of the cast concrete box girder component has the required rounded chamfer structure.

[0053] Specifically, the curved corner piece 4 is made of a plastic material, such as hard rubber. The bottom surface of the curved corner piece 4 is fixedly connected and sealed to the top surface of the base 1 and the beam height adjustment base 3 by adhesive bonding; the curved corner piece 4 can be disassembled and replaced with a scraper. Figure 1 and Figure 2R in the figure represents the radius of the arc surface of the corner piece 4. Before stacking the beam height adjustment platform 3 on top of the platform 1, the corner piece 4 on the top of the platform 1 should be removed first.

[0054] In some embodiments, the bottom of the beam height adjustment platform 3 has a clearance structure for the clearance arc corner piece 4 on both sides corresponding to the width direction.

[0055] The purpose of setting the avoidance structure at the bottom of the beam height adjustment platform 3 is to avoid interference with the arc corner piece 4 at the top of the platform 1 when the beam height adjustment platform 3 is stacked on top of the platform 1. That is, the beam height adjustment platform 3 can be directly stacked on top of the platform 1 without disassembling the arc corner piece 4 at the top of the platform 1 during construction, thus achieving the technical effect of quick construction.

[0056] In some embodiments, the clearance structure is an arc-shaped chamfer 31 that adapts to the arc-shaped corner piece 4. When the beam height adjustment platform 3 is stacked on top of the platform 1, the arc-shaped chamfer 31 adapts to and fits against the corresponding arc-shaped corner piece 4; that is, when stacking the beam height adjustment platform 3, it is not necessary to remove the arc-shaped corner piece 4 at the top of the platform 1.

[0057] In some embodiments, there are multiple beam height adjustment platforms 3, which are stacked sequentially along the height direction of the forming cavity 23; and the two ends of the multiple beam height adjustment platforms 3 in the width direction abut against the inner wall surface of the corresponding side template 21, and the two ends in the length direction abut against the inner wall surface of the corresponding end template.

[0058] Multiple beam height adjustment platforms 3 of different height specifications can be replaced or stacked to meet the needs of adjusting the beam height of precast concrete box girder components, further increasing the versatility of the device and improving the convenience of construction.

[0059] A method for prefabricating concrete box girder components, comprising the aforementioned universal formwork device for prefabricating concrete box girder components, includes the following steps:

[0060] Step 1: Set up the pedestal 1.

[0061] Specifically, the pedestal 1 includes a base and a bottom formwork. The bottom formwork is fixed to the upper surface of the base. The base can be made of concrete or steel structure, and the bottom formwork is a steel formwork.

[0062] Step 2: Arrange template components 2 around the pedestal 1 to form a molding cavity 23 above the pedestal 1; pour concrete into the molding cavity 23 to form a concrete box girder component with a certain beam height.

[0063] Specifically, the template assembly 2 includes side templates 21, end templates, and template supports 22. Both side templates 21 are of equal length to the platform 1 and are symmetrically arranged on both sides of the platform 1. Both side templates 21 are inclined, and their opposing inner walls have a slope K of 1:4 (the slope K can also be set according to the specific structural shape and size requirements of the precast concrete box girder component). Both side templates 21 are supported and fixed by the template supports 22. Two end templates are respectively sealed at both ends of the platform 1 to form forming cavities 23. Arc-shaped corner pieces 4 are pasted along the length direction on both sides of the upper surface of the steel template of the platform 1, and the arc-shaped corner pieces 4 are tightly fitted to the inner wall surface of the corresponding side template 21.

[0064] In some embodiments, the method further includes step three: when it is necessary to prefabricate concrete box girder components of different beam heights, a beam height adjustment platform 3 with a preset height is placed in the molding cavity 23 and stacked on the upper end of the steel template of the platform 1 to adjust the inner height of the molding cavity 23, and concrete is poured in the molding cavity 23 to produce concrete box girder components that meet the requirements of different beam heights.

[0065] Specifically, the beam height adjustment platform 3 is a strip of the same length as the forming cavity 23, and its cross-section in the vertical length direction is trapezoidal; the beam height adjustment platform 3 can be fitted and installed at the bottom of the forming cavity 23. The beam height adjustment platform 3 is also made of a base and a steel template. The base of the beam height adjustment platform 3 can be made of cast concrete or a steel structure. In use, it is hoisted from the top opening of the forming cavity 23 to the bottom of the forming cavity 23.

[0066] In some embodiments, curved corner pieces 4 are installed on both sides of the top surface of the platform 1 and / or the beam height adjustment platform 3 in the width direction; the bottom surface of the curved corner piece 4 is bonded and sealed to the top surface of the steel template of the platform 1 and / or the steel template of the beam height adjustment platform 3, and the curved corner piece 4 is sealed to the inner wall surface of the corresponding template assembly 2 to form a molding cavity for a precast concrete box girder component with a standard cross section.

[0067] It should be noted that in the traditional design of conventional concrete box girder members, the slope K of the two webs (side formwork) is relatively fixed. When the height of the box girder member increases, its bottom width decreases. For example... Figures 4 to 5As shown, H1 and H2 represent the beam height values ​​of the precast concrete box girder, and B1 and B2 represent the width values ​​of the abutment. When using traditional equipment to precast concrete box girders, if two or more beam height models are precast, such as precast concrete box girder components with beam height values ​​of H1 and H2, corresponding side formwork 21 is configured respectively. The bottom abutment width is arranged according to B1. With the side formwork 21, it can be used to precast concrete box girder components of model H2. When precasting concrete box girder components of model H1, a widened abutment 11 with a width value of B needs to be added to the side of the bottom abutment to meet the specification requirement of a total abutment width value of B2. Then, with the appropriate side formwork 21, the concrete box girder component of model H1 can be cast. When using traditional equipment to precast concrete box girder components of two beam height models, the corresponding beam section needs to be formed by widening or reducing B of the bottom abutment. Therefore, when the beam type changes, the platform needs to be widened or narrowed frequently, which is labor-intensive and time-consuming. In particular, a joint will be added to the bottom of the beam with a width of B2, making it difficult to guarantee the appearance quality and increasing the economic investment in the outer formwork.

[0068] like Figure 1 and Figure 2 As shown, H2 represents the beam height of the precast concrete box girder without the beam height adjustment platform 3, H1 represents the beam height of the precast concrete box girder with the beam height adjustment platform 3, B1 represents the width of the platform 1, and B2 represents the width of the beam height adjustment platform 3. The side formwork 21 of this invention is universal and does not need to be replaced when precasting concrete box girders of different specifications. This invention utilizes the process of stacking the beam height adjustment platform 3 on the upper end of the platform 1 to achieve convenient construction of precast concrete box girder components. When the slope of the side formwork on both sides of the concrete box girder is constant, for example, the design value of the slope K of the side formwork is usually 1:4. According to the principle of isosceles trapezoids, H2-H1=4×(B2-B1) / 2. Assuming the beam height of the precast concrete box girder is H2=180cm and the width is B1=110cm, when the beam height model is changed to H1=160cm, the width of the beam height adjustment platform 3 can be designed to be B2=120cm.

[0069] 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 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0070] 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 method for prefabricating concrete box girder components, characterized in that, A universal formwork device for precast concrete box girder components is used. This universal formwork device for precast concrete box girder components includes: A platform (1) includes a base and a bottom template, wherein the bottom template is fixed to the upper surface of the base; Template assembly (2) is arranged around the pedestal (1) to enclose and form a molding cavity (23) for a precast concrete box girder component above the pedestal (1); the template assembly (2) includes side templates (21) and end templates, and there are two side templates (21) and two end templates; the two side templates (21) are symmetrically arranged on both sides of the pedestal (1) in the width direction, and the two end templates are symmetrically arranged on both sides of the pedestal (1) in the length direction; A beam height adjustment platform (3) is detachably arranged at the bottom of the forming cavity (23) and stacked on the upper end of the platform (1) to adjust the beam height of the precast concrete box girder component by reducing the height of the forming cavity (23); the periphery of the beam height adjustment platform (3) is in contact with the inner wall of the side template (21) and the end template; It also includes arc corner pieces (4), which are multiple and arranged along the length of the platform (1). They are detachably connected to the top surfaces of the platform (1) and the beam height adjustment platform (3) and are sealed to the inner wall surfaces of the corresponding side templates (21). There are multiple beam height adjustment platforms (3), and the multiple beam height adjustment platforms (3) are stacked sequentially along the height direction of the forming cavity (23); and the two ends of the width direction of the multiple beam height adjustment platforms (3) abut against the inner wall surface of the corresponding side template (21), and the two ends of the length direction abut against the inner wall surface of the corresponding end template. The prefabrication method includes the following steps: Step 1: Arrange the pedestal (1); Step 2: Arrange template components (2) around the platform (1) to form a molding cavity (23) above the platform (1); install arc corner pieces (4) on both sides of the top surface width direction of the platform (1) and / or the beam height adjustment platform (3); bond and seal the bottom surface of the arc corner piece (4) to the top surface of the platform (1) and / or the beam height adjustment platform (3), and seal the arc corner piece (4) against the inner wall surface of the corresponding template component (2) to form a molding cavity for a precast concrete box girder component with a standard cross section; pour concrete into the molding cavity (23) to make a concrete box girder component with a certain beam height; Step 3: When it is necessary to prefabricate concrete box girder components with different beam heights, place the beam height adjustment platform (3) with a preset height into the molding cavity (23) and stack it on the top of the platform (1) to adjust the inner height of the molding cavity (23). Pour concrete into the molding cavity (23) to make concrete box girder components that meet the requirements of different beam heights.

2. The method for prefabricating concrete box girder components according to claim 1, characterized in that, The bottom of the beam height adjustment platform (3) has a clearance structure on both sides corresponding to the width direction to avoid the arc corner piece (4).

3. The method for prefabricating concrete box girder components according to claim 2, characterized in that, The avoidance structure is an arc-shaped chamfer (31) that is adapted to the arc corner piece (4).

Images