Prefabricated U-shaped beam permanent formwork

Abstract

The invention discloses a prefabricated U-shaped beam permanent formwork which comprises a U-shaped beam body, the U-shaped beam body is provided with a plurality of U-shaped formwork units, and a plurality of U-shaped formworks are connected in series and spliced. Each U-shaped formwork unit is composed of a bottom plate and two web plates, and the bottom plates and the web plates are subjected to interface treatment. Connecting frames are arranged at the bottoms of the U-shaped formwork units and attached to the splicing positions of the U-shaped formwork units. The connecting frame is filled with waterproof paint and epoxy resin. The U-shaped beam type formwork is used as a U-shaped beam type formwork in the pouring stage of a bridge structure, and after pouring forming, the U-shaped beam type formwork also serves as a protection plate and an outer protection layer of the structure and bears a part of loads. The U-shaped formwork unit can be made of the following different kinds of materials including a high-ductility cement-based composite material (ECC), ultra-high performance concrete (UHPC), fiber concrete and the like, and has the advantages of being easy and convenient to manufacture, convenient to use, high in durability, capable of controlling crack development and enhancing the shear resistance and stripping resistance of an interface between a beam formwork and post-pouring concrete and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and specifically is a U-shaped high-durability permanent formwork mainly used for industrial and civil building structures, road structures, bridges and other structures. It is used as a formwork in the pouring stage, and after pouring and forming, it also serves as the outer protective layer and protective plate of the structure, and at the same time bears part of the load. Background Art

[0002] At present, reinforced concrete structures are widely used in construction and bridge engineering. As an important component of reinforced concrete structure construction, the technical level and construction quality of beam formwork directly affect the safety of the entire building structure. Since ordinary concrete is a brittle material with poor tensile strength and ductility, almost all reinforced concrete structures have cracks under the long-term combined action of various loads under normal operation. Durability has always been one of the main problems faced by reinforced concrete structures. In addition, in the current domestic construction field, industrial and civil building structures, road structures, bridges and other structures have high requirements for structural performance due to large loads. Most of them use cast-in-place structures or use wooden formworks, steel formworks and other formworks, which have unfavorable factors such as large consumption, inconvenient disassembly and assembly, high turnover costs, low utilization rate, low construction efficiency, and many processes. The above points have always been difficult to solve in the construction and use of industrial and civil building structures, road structures and bridges. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a prefabricated U-shaped beam permanent formwork to improve the disadvantages brought by the traditional formwork and improve the durability of the structure. It has a high degree of industrialization, is easy to construct, can be quickly assembled on site, reduces production costs and ultimately prolongs the service life of the structure, and has good shear resistance. To this end, the present invention adopts the following technical solutions: It is composed of a plurality of U-shaped plate units and connecting frames which are connected in series. The U-shaped plate unit is composed of a first web, a second web and a bottom plate; the connecting frame is composed of a transverse connecting rod, a first vertical connecting rod and a second vertical connecting rod; a connecting frame is arranged at the bottom of the plurality of the above-mentioned U-shaped plate units, and the connecting frame is attached to the joint of the plurality of the above-mentioned U-shaped plate units; the joint is filled with waterproof coating and epoxy resin; the U-shaped plate unit is made of steel-polypropylene mixed fiber concrete.

[0004] On the basis of adopting the above technical solution, the present invention can also adopt the following further technical solution: The steel-polypropylene hybrid fiber concrete is made of the following raw materials by weight per cubic meter: 150-250 parts of water, 450-550 parts of cement, 500-600 parts of fine aggregate, 950-1250 parts of coarse aggregate, 70-170 parts of steel fiber and 0.5-2.5 parts of polypropylene fiber. The volume content of the steel fiber is 1%-2%, and the volume content of the polypropylene fiber is 0.1%-0.2%.

[0005] The bottom surfaces of the first web and the second web are provided with at least one connecting groove, the top surface of the bottom plate is provided with connecting teeth matching the connecting groove, the connecting groove is adapted to the connecting teeth, and the first web and the second web are vertically fixedly connected to the bottom plate through the connecting groove.

[0006] Bolt connection holes are reserved at the connection positions of the first vertical connecting rod, the second vertical connecting rod and the transverse connecting rod.

[0007] The first web, the second web and the inner surface of the bottom plate are all subjected to interface treatment and are provided with a plurality of grooves.

[0008] By applying waterproof coating and epoxy resin to the joint area between the U-shaped plate unit and the connecting frame for filling, its function is equivalent to that of an expansion joint, which can reduce the temperature stress caused by temperature changes in the prefabricated U-shaped beam concrete and reduce the stress concentration at the splicing position.

[0009] The present invention can adjust the number and size of the U-shaped plate units according to the use requirements to form a template of the required size. At the same time, the connecting frame can ensure the sealed connection between the U-shaped plate units, effectively avoiding the leakage of concrete slurry, ensuring the overall quality of the cast-in-place beam, and forming a complete template system. The inner surface of the U-shaped plate unit of the present invention is surface treated and a plurality of grooves are provided, which can effectively enhance the shear and peel resistance of the interface between the permanent template of the U-shaped beam and the post-cast concrete.

[0010] As can be seen from the above, the present invention is used as a template during the pouring stage. After pouring and forming, it does not need to be removed, but serves as a protective plate and outer protective layer of the structure, becoming a permanent template. It has low cost and eliminates demolition fees and turnover costs, reduces engineering costs, reduces construction intensity, and greatly shortens construction time. At the same time, since the template is made of steel-polypropylene mixed fiber concrete, the steel fiber can be tightly combined with the concrete matrix, thereby effectively controlling the development of cracks; not only that, after cracking, the randomly distributed steel fibers can effectively bear part of the stress; in addition, polypropylene fibers can also slow down concrete cracking, effectively bridge the microcracks generated by concrete, keep the concrete in good integrity, help concrete to disperse stress, and indirectly improve the tensile properties of concrete. At the same time, the U-shaped plate unit and the connecting frame structure of the present invention are adopted, and the U-shaped beam template is assembled by splicing the U-shaped plate unit and the connecting frame, which has the beneficial effects of simple formwork, good template force, fewer processes, high construction efficiency, low material consumption, low labor cost and controllable formwork quality. The U-shaped beam formwork of the present invention can also bear part of the load of the structure and ensure the shear resistance and peeling resistance between the post-cast concrete, thereby improving the overall benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of a permanent beam template structure (rectangular groove interface) formed by combining the U-shaped plate unit and the connecting frame of the present invention Figure 2 Schematic diagram of a permanent beam formwork structure (point-shaped groove interface) formed by combining the U-shaped plate unit and the connecting frame of the present invention Figure 3 This is a top view of the U-shaped beam permanent template (rectangular groove interface) of the present invention Figure 4 This is a top view of the U-shaped beam permanent formwork (point-shaped groove interface) of the present invention. Figure 5 Schematic diagram of the bottom plate and web of the U-shaped plate unit of the U-shaped beam permanent formwork of the present invention Figure 6 yes Figure 3 AA section view Figure 7 yes Figure 4 BB cross-section view Figure 8 This is a schematic diagram of the connection frame of the U-shaped beam permanent template of the present invention

[0012] Figure numerals: 1-U-shaped plate unit, 2-connecting frame, 3-bottom plate, 4-first web, 5-second web, 6-transverse connecting rod, 7-first vertical connecting rod, 8-second vertical connecting rod, 9-bolt, 10-connecting tooth, 11-connecting groove, 12-rectangular groove, 13-point groove. Specific implementation plan

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the examples 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, the directional indications are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0015] A prefabricated U-shaped beam permanent formwork of this embodiment is composed of a U-shaped plate unit 1 and a connecting frame 2 connected in series, the connecting frame 2 is attached to the bottom of the U-shaped plate unit 1, and a plurality of U-shaped plate units 1 are connected in series with the connecting frame, and waterproof coating and epoxy resin are filled at the joint to form a U-shaped beam formwork, the U-shaped plate unit 1 is made of steel-polypropylene mixed fiber concrete material, and the concrete is made of the following raw materials by weight per cubic meter: 150-250 parts of water, 450-550 parts of cement, 500-600 parts of fine aggregate, 950-1250 parts of coarse aggregate, and 70-170 parts of steel fiber and 0.5-2.5 parts of polypropylene fiber. Among them, the volume content of steel fiber is 1%-2%, and the volume content of polypropylene fiber is 0.1%-0.2%.

[0016] Reference Figure 1-3 The U-shaped plate unit 1 is composed of a first web 4 which is fixedly connected to a connecting groove of a bottom plate 3 by means of connecting teeth, and a second web 5 which is fixedly connected to a connecting groove of the bottom plate 3 by means of connecting teeth. A U-shaped member is formed by the bottom plate 3, the first web 4 and the second web 5, which is suitable for the shape of the current beam.

[0017] At least one connecting tooth is disposed at the bottom of each of the first web 4 and the second web 5, and a connecting groove matched with the connecting tooth is disposed at the top of the bottom plate 3, so as to ensure that the web and the bottom plate can be accurately matched when fixedly connected, thereby improving construction efficiency.

[0018] The transverse connecting rod 6, the first vertical connecting rod 7, and the second vertical connecting rod 8 form a connecting frame 2. The first vertical connecting rod 7 and the second vertical connecting rod 8 are fixed to the transverse connecting rod by bolts to form a connecting frame. The connecting frame 2 fits tightly to the splicing part of the U-shaped plate unit. A connecting frame 2 is respectively arranged at both ends of the U-shaped plate unit 1. The connecting rods are all T-shaped components, which are conducive to the splicing between the U-shaped plate units.

[0019] During splicing, a connection frame 2 is placed at the bottom of adjacent U-shaped plate units 1, and waterproof coating and epoxy resin are filled at the connection part, which can effectively reduce the gap at the connection part, avoid leakage of post-poured concrete, and reduce the stress concentration at the connection part.

[0020] Reference Figure 4-7 The inner surfaces of the bottom plate 3, the first web 4 and the second web 5 are all subjected to interface treatment, and are provided with a plurality of rectangular grooves 12 or dot grooves 13, which can effectively enhance the shear and peeling resistance of the interface between the permanent formwork of the U-shaped beam and the post-cast concrete.

[0021] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A prefabricated U-shaped beam permanent formwork, characterized in that: It is composed of a plurality of U-shaped plate units (1) and connecting frames (2) connected in series, wherein the U-shaped plate unit (1) is composed of a web and a bottom plate, and the inner surfaces of the bottom plate and the web are both subjected to interface treatment; the connecting frame is composed of a transverse connecting rod and a vertical connecting rod, and the vertical connecting rods are welded or bolted to form a connecting frame; the bottoms of the plurality of U-shaped plate units are provided with connecting frames, and the two ends of the U-shaped plate units are each provided with a connecting frame, and the connecting frames are attached to the joints of the plurality of U-shaped plate units; after the joints are completed, the joints are filled with waterproof coating and epoxy resin; the U-shaped plate units are made of fiber concrete material; the beam template is used as a template during the pouring stage, and after the pouring is formed, it does not need to be removed, and serves as a protective plate and an outer protective layer of the structure; the beam template bears part of the structural load, controls the crack width, and enhances the shear and peel resistance of the interface with the post-cast concrete.

2. A prefabricated U-shaped beam permanent formwork according to claim 1, characterized in that: The fiber concrete comprises the following components: cement, fine aggregate, coarse aggregate, water, steel fiber and polypropylene fiber, or a combination of two thereof.

3. A prefabricated U-shaped beam permanent formwork according to claim 2, characterized in that: The fiber concrete is steel-polypropylene hybrid fiber concrete, which is made of the following raw materials by weight per cubic meter: 150-250 parts of water, 450-550 parts of cement, 500-600 parts of fine aggregate, 950-1250 parts of coarse aggregate, 70-170 parts of steel fiber and 0.5-2.5 parts of polypropylene fiber.

4. A prefabricated U-shaped beam permanent formwork according to claim 2, characterized in that: In the steel-polypropylene hybrid fiber concrete, the volume percentage of the steel fiber and the polypropylene fiber relative to the total volume of the hybrid fiber concrete is 1.1% to 2.2%.

5. A prefabricated U-shaped beam permanent formwork according to claim 1, characterized in that: The web is divided into a first web and a second web. One end of the first web close to the bottom plate is vertically fixedly connected to one end of the bottom plate, and one end of the second web close to the bottom plate is vertically fixedly connected to the other end of the bottom plate.

6. A prefabricated U-shaped beam permanent formwork according to claim 5, characterized in that: The bottom surface of the first web and the second web are provided with at least one connecting groove, the top surface of the bottom plate is provided with connecting teeth matching with the connecting groove, the connecting groove is adapted to the connecting teeth, and the two webs and one bottom plate are fixedly connected by matching the connecting groove and the connecting teeth.

7. A prefabricated U-shaped beam permanent formwork according to claim 1, characterized in that: The interface treatment types between the bottom plate and the inner surface of the web plate include a rectangular groove interface or a dot groove interface.

8. A prefabricated U-shaped beam permanent formwork according to claim 1, characterized in that: The connecting frame is composed of a transverse connecting rod, a first vertical connecting rod and a second vertical connecting rod; the transverse connecting rod is located at the connection of the bottom plate, the first vertical connecting rod is located at the connection of the first web, and the second vertical connecting rod is located at the connection of the second web.

9. A prefabricated U-shaped beam permanent formwork according to claim 8, characterized in that: The transverse connecting rod, the first vertical connecting rod and the second vertical connecting rod are all T-shaped components.

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