Fabricated UHPC beam joint

Abstract

The utility model relates to the technical field of frame beam connection, and provides an assembly type UHPC beam joint which comprises a main body, the main body is provided with a key groove, the key groove is provided with a groove bottom and an opening, the shape of the groove bottom is the same as that of the opening, the shape area of the opening is larger than that of the groove bottom, the groove bottom and the opening are polygonal, and the angles of the polygon are obtuse angles. By means of the technical scheme, the problems that in the prior art, pouring of the connecting face is not compact, bubbles are possibly formed, and the pouring strength is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of frame beam connection, and specifically, to an assembled UHPC beam joint. Background Art

[0002] An assembled building, also known as a prefabricated building or a modular building, is a building method in which building components are prefabricated in a factory and then transported to a construction site for assembly. It has advantages such as high construction efficiency, easy quality assurance, and high reuse rate. The state has put forward clear requirements for the assembly rate of assembled buildings. Although assembled buildings have many advantages, during the concrete pouring process, especially during the pouring of precast beams, it is often difficult to achieve a completely dense state of concrete pouring at the joint surface, which may lead to a decline in the overall performance of the structure. During the pouring process, air bubbles may form inside the concrete. These air bubbles will weaken the strength of the concrete and affect the safety and durability of the structure. Summary of the Utility Model

[0003] The utility model provides an assembled UHPC beam joint, which solves the problems in the related technology that the joint surface pouring is not dense, air bubbles may be formed, and the pouring strength is affected.

[0004] The technical solution of the utility model is as follows: An assembled UHPC beam joint, comprising:

[0005] A main body, the main body has a keyway, the keyway has a bottom and an opening, the shape of the bottom is the same as the shape of the opening, the shape area of the opening is larger than the shape area of the bottom, and the shapes of the bottom and the opening are polygons and all polygon angles are obtuse angles.

[0006] Optionally, the shape size of the opening is an equi-proportion increase of the shape size of the bottom.

[0007] Optionally, the bottom and the opening are hexagons.

[0008] Optionally, the keyway has an upper groove surface, a lower groove surface and side groove surfaces, the side groove surfaces are located on both sides of the extending direction of the upper groove surface towards the lower groove surface, and each side has at least two interconnected side groove surfaces, and the included angle between the side groove surface and the bottom is an obtuse angle.

[0009] Optionally, the included angles between several side groove surfaces and the bottom are all the same.

[0010] Optionally, the included angle between the upper groove surface and the bottom is an obtuse angle, and the angle is greater than the included angle between the side groove surface and the bottom.

[0011] Optionally, the angle between the lower groove surface and the groove bottom is an obtuse angle, and the angle is smaller than the angle between the side groove surface and the groove bottom.

[0012] Optionally, the upper dimension of the groove bottom is smaller than the lower dimension.

[0013] Optionally, the shape of the groove bottom is symmetric about the left and right sides.

[0014] Optionally, the main body further has a connecting end face, the connecting end face is obliquely arranged at one end of the main body, there are a plurality of key grooves, and the plurality of key grooves are arranged in an array on the connecting end face.

[0015] The working principle and beneficial effects of the present utility model are as follows:

[0016] In the present utility model, the shapes of the groove bottom and the opening are the same, but the opening area is larger than the groove bottom area, which means that when inserting the precast beam, the joint surface of the precast beam will form a tight fit with the key groove. This design can increase the contact area, thereby improving the connection friction and shear strength. The obtuse angle design reduces the stress concentration points, improves the overall shear resistance, and improves the overall durability and crack resistance of the joint. The design with the opening area larger than the groove bottom area forms a gradually changing cross-section, which helps the concrete to better fill the key groove during the pouring process. The gradually changing cross-section can reduce the formation of air bubbles and improve the pouring density. When using UHPC (ultra-high performance concrete), this design can further enhance the self-compacting effect, ensure that the concrete fully fills the key groove, and reduce voids and air bubbles. Description of the Drawings

[0017] The following will further illustrate the above characteristics, technical features, advantages and implementation methods of the present utility model in a clear and easy-to-understand manner in combination with the drawings of the preferred embodiments.

[0018] Figure 1 It is a schematic structural diagram of the connection state of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of a single main body of the present utility model;

[0020] In the figure: 1, main body; 101, connecting end face; 2, key groove; 201, groove bottom; 202, opening; 203, upper groove surface; 204, lower groove surface; 205, side groove surface. Detailed Embodiments

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0022] To make the drawings concise, only the parts related to the utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0023] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0025] Embodiment 1

[0026] Refer to Figures 1 to 2, a prefabricated UHPC beam joint is proposed, including: a main body 1, the main body 1 also has a connecting end face 101, the connecting end face 101 is inclined and arranged at one end of the main body 1, there are multiple key grooves 2, and the multiple key grooves 2 are arranged in an array on the connecting end face 101. The key groove 2 has a groove bottom 201 and an opening 202, the shape of the groove bottom 201 is the same as the shape of the opening 202, the shape area of the opening 202 is larger than the shape area of the groove bottom 201, the shapes of the groove bottom 201 and the opening 202 are polygons and all polygon angles are obtuse angles. The shape size of the opening 202 is an equi-proportion increase of the shape size of the groove bottom 201, and the groove bottom 201 and the opening 202 are hexagons. The key groove 2 has an upper groove surface 203, a lower groove surface 204 and side groove surfaces 205, the side groove surfaces 205 are located on both sides of the extending direction of the upper groove surface 203 towards the lower groove surface 204, and each side has at least two interconnected side groove surfaces 205, and the included angle between the side groove surface 205 and the groove bottom 201 is an obtuse angle. The included angles between several side groove surfaces 205 and the groove bottom 201 are all the same. The included angle between the upper groove surface 203 and the groove bottom 201 is an obtuse angle, and the angle is greater than the included angle between the side groove surface 205 and the groove bottom 201. The included angle between the lower groove surface 204 and the groove bottom 201 is an obtuse angle, and the angle is less than the included angle between the side groove surface 205 and the groove bottom 201. The upper dimension of the groove bottom 201 is smaller than the lower dimension. The shape of the groove bottom 201 is symmetric about the left and right.

[0027] In this embodiment, the shapes of the groove bottom 201 and the opening 202 are the same, but the area of the opening 202 is larger than the area of the groove bottom 201, which means that when inserting the precast beam, the joint surface of the precast beam will form a tight fit with the key groove 2. This design can increase the contact area, thereby improving the connection friction and shear strength. The obtuse angle design reduces the stress concentration points, improves the overall shear resistance, and improves the overall durability and crack resistance of the joint. The design that the area of the opening 202 is larger than the area of the groove bottom 201 forms a gradually changing cross-section, which helps the concrete to better fill the key groove 2 during the pouring process. The gradually changing cross-section can reduce the formation of air bubbles and improve the pouring density. When using UHPC (high-performance concrete), this design can further enhance the self-compacting effect, ensure that the concrete fully fills the key groove 2, and reduce voids and air bubbles.

[0028] The keyway 2 has an upper groove surface 203, a lower groove surface 204 and side groove surfaces 205. The side groove surfaces 205 are located on both sides of the upper groove surface 203 extending towards the lower groove surface 204. Each side has at least two interconnected side groove surfaces 205. The angle between the side groove surface 205 and the groove bottom 201 is an obtuse angle. The angles between several side groove surfaces 205 and the groove bottom 201 are all the same. The angle between the upper groove surface 203 and the groove bottom 201 is an obtuse angle, and the angle is greater than the angle between the side groove surface 205 and the groove bottom 201. The angle between the lower groove surface 204 and the groove bottom 201 is an obtuse angle, and the angle is less than the angle between the side groove surface 205 and the groove bottom 201. And the shapes of the groove bottom 201 and the opening 202 are symmetric about the left and right. The upper dimension of the groove bottom 201 is smaller than the lower dimension of the groove bottom 201, and the same is true for the opening 202. Therefore, the overall forms an asymmetric spindle-shaped structure. The asymmetric spindle-shaped connection surface can form a shear-resistant connection key and can also prevent the generation of air bubbles on the contact surface. The asymmetric spindle-shaped shear-resistant connection key can increase the roughness of the wet connection surface, increase the contact area. The precast beam is connected through the UHPC wet connection joint, which is convenient for connection and can be applied to the connection of beams with any included angle.

[0029] Considering the pouring process, which is from bottom to top, the lower dimension of the groove bottom 201 is larger, and the inclination angle of the lower groove surface 204 is the smallest, so it is easier to fill and the support is more stable. The upper dimension of the groove bottom 201 is smaller, and the inclination angle of the upper groove surface 203 is larger, making it easier to compact the upper part during pouring and avoiding the generation of air bubbles.

[0030] The lower dimension of the groove bottom 201 is designed to be larger, which can provide a larger space to accommodate the initially poured concrete. The larger lower dimension helps to ensure that the concrete can flow smoothly and fill the entire bottom area. With a certain overall area of the groove bottom 201, it increases the contact area at the bottom, thus improving the overall stability. The inclination angle of the lower groove surface 204 is designed to be the smallest, so that during the upward flow of the concrete, it can move more smoothly along the lower groove surface 204, avoiding the flow resistance and air bubble accumulation caused by a steep slope. The gentle inclination angle also helps the concrete to form a stable support structure at the bottom, improving the overall stability. The upper dimension of the groove bottom 201 is designed to be smaller. The smaller upper dimension helps to gradually reduce the flow space of the concrete during pouring, thus forcing the concrete to fill the keyway 2 more tightly. This design reduces the voids in the upper area and improves the compaction degree of the pouring. The inclination angle of the upper groove surface 203 is designed to be larger, which means that the upper groove surface 203 is a relatively steep slope. This design enables the concrete to cover the entire surface faster when filling the upper part, and due to the larger inclination angle, the concrete is easier to compact, reducing the generation of air bubbles. The larger inclination angle also promotes the upward discharge of air bubbles in the concrete, further improving the pouring quality.

[0031] The larger lower dimension and the gentle inclination angle of the lower groove surface 204 enable the concrete to fill the bottom more smoothly during the upward flow process, reducing the flow resistance. The gentle lower groove surface 204 provides stable support, ensuring the uniform distribution and stability of the bottom concrete, and providing a solid foundation for the upper casting. The smaller upper dimension and the larger inclination angle of the upper groove surface 203 prompt the concrete to fill more tightly in the upper area, reducing the generation of air bubbles. At the same time, the larger inclination angle helps the air bubbles to discharge upward, improving the compactness of the casting. The trapezoidal cross-section design enables the concrete to be gradually compressed during the filling process, ensuring that the concrete in the entire keyway 2 can reach a high degree of compactness, thereby improving the connection strength and durability.

[0032] Embodiment 2

[0033] Different from Embodiment 1, in this embodiment, the number of sides of the groove bottom 201 and the opening 202 is ≥7, that is, a heptagon or above. Preferably, the number of sides is an even number, and the side edges are symmetric about the center line, ensuring the uniformity of the keyway 2 in all directions, thereby improving the uniformity and compactness of the casting.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An assembled UHPC beam joint, characterized in that Including: A main body (1), the main body (1) having a keyway (2), the keyway (2) having a bottom surface (201) and an opening (202), the shape of the bottom surface (201) being the same as the shape of the opening (202), the shape area of the opening (202) being larger than the shape area of the bottom surface (201), the shapes of the bottom surface (201) and the opening (202) being polygons and all polygon angles being obtuse angles.

2. The prefabricated UHPC beam joint according to claim 1, wherein, The shape size of the opening (202) is an equi-proportion increase of the shape size of the bottom surface (201).

3. The prefabricated UHPC beam joint according to claim 2, wherein, The bottom surface (201) and the opening (202) are hexagons.

4. The prefabricated UHPC beam joint according to claim 2 or 3, characterized in that, The keyway (2) has an upper groove surface (203), a lower groove surface (204) and side groove surfaces (205), the side groove surfaces (205) being located on both sides of the extending direction of the upper groove surface (203) towards the lower groove surface (204), each side having at least two interconnected side groove surfaces (205), and the angle between the side groove surface (205) and the bottom surface (201) being an obtuse angle.

5. The prefabricated UHPC beam joint according to claim 4, characterized in that, The angles between a plurality of the side groove surfaces (205) and the bottom surface (201) are all the same.

6. The prefabricated UHPC beam joint according to claim 4, characterized in that, The angle between the upper groove surface (203) and the bottom surface (201) is an obtuse angle, and the angle is larger than the angle between the side groove surface (205) and the bottom surface (201).

7. The prefabricated UHPC beam joint according to claim 6, wherein, The angle between the lower groove surface (204) and the bottom surface (201) is an obtuse angle, and the angle is smaller than the angle between the side groove surface (205) and the bottom surface (201).

8. The prefabricated UHPC beam joint according to claim 6, characterized in that The upper dimension of the bottom surface (201) is smaller than the lower dimension.

9. The prefabricated UHPC beam joint according to claim 7, characterized in that, The shape of the bottom surface (201) is symmetrical about the left and right sides.

10. The prefabricated UHPC beam joint according to claim 1, characterized in that, The main body (1) further has a connecting end face (101), the connecting end face (101) being obliquely arranged at one end of the main body (1), and there being a plurality of the keyways (2), the plurality of keyways (2) being arranged in an array on the connecting end face (101).

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