A new type of connection joint for precast concrete columns or shear walls

Abstract

This utility model discloses a novel connection node for precast concrete columns or shear walls, relating to the field of prefabricated building technology. It is used to connect at least one layer of precast components on a foundation. The foundation has several upwardly penetrating first reserved channels, and a first reserved groove is provided at the lower end of each of the first reserved channels. Each layer of precast components has a corresponding vertically penetrating second reserved channel. Prestressed tendons are installed through the second reserved channels and their corresponding first reserved channels. Prestressed anchors are provided at the lower end of the prestressed tendons extending into the first reserved grooves and at the upper end extending out of the uppermost second reserved channel. This utility model offers convenient assembly, high efficiency, high connection strength after assembly, and reduces steel consumption.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, and in particular to a novel connection node for precast concrete columns or shear walls. Background Technology

[0002] Currently, vertical connections of precast concrete columns or shear walls, such as Figure 5 As shown, the lower precast component (column or shear wall) has an upwardly extending lower reinforcing bar embedded in it, and the upper precast component (column or shear wall) has a precast reinforcing bar sleeve embedded at its lower end. The upper end of the sleeve is threaded to the upper reinforcing bar inside the upper precast component. During installation, a layer of mortar is first laid on the top surface of the lower precast component. Then, the reinforcing bar sleeve at the lower end of the upper precast component is aligned with the downwardly extending lower reinforcing bar of the lower precast component, so that the lower reinforcing bar is inserted into the corresponding reinforcing bar sleeve. After insertion, grout is injected into the sleeve from the lower grouting port. The sleeve is full when the grout overflows from the upper port.

[0003] This type of sleeve connection node is mainly used for vertical connections between precast components on adjacent floors. However, due to the small sleeve opening and the large number of reinforcing bars, inserting the lower reinforcing bar into the upper sleeve is time-consuming and labor-intensive. Grouting each sleeve after insertion is also very troublesome, resulting in low overall efficiency and a long vertical assembly cycle for precast concrete columns or shear walls. Furthermore, the tensile strength between adjacent precast components is mainly achieved through the bond force between the grout in the sleeve and the lower reinforcing bar, resulting in low tensile strength. Especially when grouting within the sleeve is difficult to ensure fullness, the tensile strength of the connection node often fails to meet design requirements. A common approach is to increase the number of lower reinforcing bars and sleeves, but this further increases the difficulty of inserting the lower reinforcing bars into the sleeves, increases the complexity of grouting, increases steel consumption, and has a limited effect on improving tensile strength after connection. Therefore, improvements are needed for the vertical connection nodes of precast concrete columns or shear walls. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a new type of connection node for precast concrete columns or shear walls that is easy to assemble, efficient, has high connection strength after assembly, and helps to reduce the amount of steel used.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a novel connection node for precast concrete columns or shear walls, used to connect at least one layer of precast components on a foundation. The foundation has several upwardly penetrating first reserved channels, and a first reserved groove is provided at the lower end of each of the first reserved channels. Each layer of precast components has a second reserved channel that penetrates vertically corresponding to the first reserved channels. Prestressed tendons are installed through the second reserved channels and the corresponding first reserved channels. Prestressed anchors are provided at the lower end of the prestressed tendons extending into the first reserved grooves and at the upper end of the uppermost second reserved channel.

[0006] As a preferred technical solution, the prestressed tendon is filled with adhesive mortar between itself and the corresponding second and first reserved channels.

[0007] As a preferred technical solution, the foundation is provided with a grouting port that connects to the lower end of the first reserved channel, and the uppermost precast component is provided with a grouting outlet that connects to the upper end of the corresponding second reserved channel.

[0008] As a preferred technical solution, an adhesive mortar layer is provided between the bottommost precast component and the foundation, as well as between two adjacent layers of precast components. The adhesive mortar layer has a mortar-free zone corresponding to the first reserved channel or the second reserved channel.

[0009] As a preferred technical solution, the upper ends of both the first reserved channel and the second reserved channel are tapered and gradually widen from bottom to top.

[0010] As a preferred technical solution, the prestressed tie bar is a prestressed steel strand or a prestressed steel bar.

[0011] As a preferred technical solution, adhesive mortar is poured into the first reserved groove.

[0012] As a preferred technical solution, at least one component group is also installed on the uppermost precast component, and each component group includes at least one layer of the precast component; a second reserved groove is opened at the lower end of the lowermost precast component in each component group corresponding to each second reserved channel; the prestressed tendons in each component group are respectively connected to the prestressed tendons below; and a prestressed anchor is provided on the upper end of the prestressed tendon extending out of the uppermost precast component in each component group.

[0013] By adopting the above technical solution, a novel connection node for precast concrete columns or shear walls is provided for connecting at least one layer of precast components on a foundation. The foundation has several upwardly penetrating first reserved channels, and a first reserved groove is provided at the lower end of each of the first reserved channels. Each layer of precast components has a corresponding vertically penetrating second reserved channel. Prestressed tendons are installed through the second reserved channels and the corresponding first reserved channels. Prestressed anchors are provided at the lower end of the prestressed tendons extending into the first reserved grooves and at the upper end extending out of the uppermost second reserved channel. This invention allows the precast components to be installed sequentially on the foundation, and then the prestressed tendons are threaded through from top to bottom and tensioned by the prestressed anchors at both ends to reach the design stress. Therefore, a relatively small number of prestressed tendons can form a high tensile strength between the precast components and the foundation, which helps to reduce the amount of steel used. During assembly and connection, the precast components are directly installed by grouting. After installation, the reserved holes can be basically aligned, and the prestressed tendons can be directly inserted and anchored. This eliminates the cumbersome process of aligning and inserting all the reinforcing bars and sleeves before assembly, making assembly convenient and efficient. Attached Figure Description

[0014] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0015] Figure 1 This is a structural schematic diagram of the prestressed tendon using steel strand in Embodiment 1 of this utility model;

[0016] Figure 2 This is a structural schematic diagram of the prestressed tie bar using steel bars in Embodiment 1 of this utility model;

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of a precast concrete column as the precast component in Embodiment 1 of this utility model;

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of a precast concrete shear wall, which is the precast component in Embodiment 1 of this utility model.

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of a precast component of another type of precast concrete shear wall in Embodiment 1 of this utility model.

[0020] Figure 6 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0021] In the diagram: 1-Foundation; 11-First reserved duct; 12-First reserved groove; 2-Precast component; 21-Second reserved duct; 22-Second reserved groove; 3-Component group; 4-Adhesive mortar layer; 41-No mortar zone; 5-Prestressed tie bar; 6-Prestressed anchor; 61-Pad plate; 7-Adhesive mortar; 71-Grouting port; 72-Grouting outlet; 81-Rebar connector; 82-Tie bar connector. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0023] Example 1: As Figure 1 and Figure 2 As shown, a novel connection node for precast concrete columns or shear walls is used to connect at least one layer of precast components 2 on a foundation 1, wherein the precast components 2 are installed sequentially from bottom to top. The precast components 2 can be as follows: Figure 3 The precast concrete column shown, such as Figure 4 and Figure 5 The precast concrete shear walls shown, or a combination of both, are not limited herein. Conventionally, such as Figure 1 and Figure 2 As shown, an adhesive mortar layer 4 is provided between the bottommost precast component 2 and the foundation 1, as well as between two adjacent layers of precast components 2. More specifically, after the adhesive mortar is first laid on the top surface of the foundation 1, the first layer of precast components 2 is then placed on the foundation 1 to form a mortar-supported installation; after the adhesive mortar is first laid on the top surface of the precast component 2, the next layer of precast components 2 is then placed on it to form a sequential mortar-supported installation.

[0024] like Figure 1 and Figure 2 As shown, the foundation 1 has several upwardly penetrating first reserved channels 11, and the foundation 1 has a first reserved groove 12 at the lower end of each of the first reserved channels 11; each layer of the precast component 2 has a second reserved channel 21 that is vertically penetrating corresponding to the first reserved channels 11; prestressed tendons 5 are installed through the second reserved channels 21 and the corresponding first reserved channels 11, and prestressed anchors 6 are respectively provided on the lower end of the first reserved groove 12 and the upper end of the uppermost second reserved channel 21.

[0025] In this embodiment, the precast component 2 is sequentially installed on the foundation 1 using grout, and then the prestressed tendons 5 are threaded through from top to bottom and tensioned by the prestressed anchors 6 at both ends to reach the design stress. Therefore, a relatively small number of prestressed tendons 5 can form a high tensile strength between the precast component 2 and the foundation 1, which helps reduce steel consumption. During assembly, the precast component 2 is directly installed using grout, and the pre-drilled holes can be basically aligned after installation, allowing for direct threading and anchoring of the prestressed tendons 5. This eliminates the cumbersome process of requiring all reinforcing bars and sleeves to be aligned and inserted before assembly, making assembly convenient and efficient.

[0026] The first reserved channel 11 and the second reserved channel 21 can be formed by core extraction of pre-embedded steel columns or by direct pre-embedded corrugated pipes, and there is no limitation on them.

[0027] Preferably, the prestressed tendon 5 is filled with adhesive grout 7 between itself and the corresponding second reserved channel 21 and first reserved channel 11 to improve the adhesion and stability of the prestressed tendon 5 and ensure its tensile strength. Accordingly, the foundation 1 is provided with a grouting port 71 connecting to the lower end of the first reserved channel 11, and the uppermost precast component 2 is provided with a grout outlet 72 connecting to the upper end of the corresponding second reserved channel 21. Adhesive grout 7 is injected from the grouting port 71, and the grouting is completed when the grout outlet 72 begins to overflow. This grouting can be completed in one piece with multiple channels, and since the number of reserved channels in this embodiment is not large, the grouting work is significantly simplified.

[0028] Preferably, adhesive grout 7 is poured into the first reserved groove 12 so that the first reserved groove 12 is also poured when grouting is performed in the reserved channel, thereby promoting the formation of a regular integral component of the foundation 1 and ensuring load-bearing performance. The pouring of the first reserved groove 12 can be achieved by setting up a formwork at the reserved groove.

[0029] In actual construction, since the bonding mortar layer 4 is laid before the installation of the precast components 2, the bonding mortar layer 4 has a mortar-free area 41 corresponding to the first reserved channel 11 or the second reserved channel 21, so as to avoid the bonding mortar layer 4 from hindering the subsequent insertion of the prestressed tendons 5. Preferably, the upper ends of the first reserved channel 11 and the second reserved channel 21 are both tapered and gradually widened from bottom to top. This tapered guide facilitates the smooth insertion of the prestressed tendons 5 from top to bottom.

[0030] In this embodiment, the prestressed tie bar 5 is a prestressed steel strand or a prestressed steel bar, and correspondingly, the prestressed anchor 6 is either a steel strand anchor or a steel bar anchor. Conventionally, the steel strand anchor has a structure with a wedge-shaped clamping block inside the anchor sleeve, while the steel bar anchor is directly in the form of a tension nut. The structural principles of both are well-known technologies and will not be elaborated further here. Furthermore, given the small outer diameter of both the steel strand anchor and the steel bar anchor, a pad 61 should be used at the end of the reserved duct.

[0031] When the prestressing tendon 5 is a prestressed steel strand, it is inserted downwards to its lower end, reaching the first reserved groove 12. The corresponding pad 61 and steel strand anchor are then fitted onto the lower end, and the steel strand anchor is clamped to the prestressing tendon 5. The corresponding pad 61 and steel strand anchor are fitted onto the upper end of the prestressing tendon 5, and the prestressing tendon 5 is initially anchored. Then, a dedicated tensioning device is used to pull the prestressing tendon 5 upwards until the design stress is reached. During this process, the prestressed tendon 5 has a certain upward displacement relative to the upper end of the steel strand anchor. The wedge-shaped clamping block in the steel strand anchor does not affect its upward displacement, while the lower end of the prestressed tendon 5 will drive the wedge-shaped clamping block in the lower end of the steel strand anchor to have a stronger clamping force. After the prestressed tendon 5 reaches the design stress, the wedge-shaped clamping block in the upper end of the steel strand anchor is clamped, thus finally achieving the anchoring of the prestressed tendon 5 at the design stress. Since the steel strand is flexible, the prestressed steel strand inserted downwards is preferably a single piece, and its length can be obtained by adding a margin to the overall length of the pre-reserved duct into which it is inserted.

[0032] When the prestressed tendon 5 is a prestressed steel bar, it is inserted downwards to the lower end of the first reserved groove 12. The corresponding pad 61 and steel bar anchor are installed on the lower end to form a limit at the lower end. Then, the corresponding pad 61 and steel bar anchor are installed on the upper end of the prestressed tendon 5. By tightening the tension nut in the steel bar anchor, the prestressed tendon 5 is gradually tightened to reach the design stress and simultaneously form an anchor. Since the steel bar is a rigid structure, when the overall length of the reserved duct is long, the prestressed steel bar is preferably set in segments. Adjacent steel bar segments are connected by steel bar connectors 81. More specifically, after inserting a steel bar segment downwards, the upper end of the steel bar segment is connected to the next steel bar segment through the steel bar connector 81, and then the insertion operation continues. The steel bar connector 81 is a connector that can form a threaded connection with the steel bar, which is a known technology and will not be described in detail here.

[0033] Example 2: As shown in Figure 6, the difference between this example and Example 1 is that when multiple layers of prefabricated components 2 are installed on the foundation 1, this example assembles them in groups. The group consisting of several prefabricated components 2 installed in Example 1 is the lowest group. At least one component group 3 is also installed on the uppermost prefabricated component 2, and each component group 3 includes at least one layer of prefabricated component 2. At the lower end of the lowest layer of prefabricated component 2 in each component group 3, a second reserved groove 22 is respectively opened corresponding to each second reserved channel 21. The prestressed tendons 5 in each component group 3 are respectively connected to the corresponding prestressed tendons 5 below them. A prestressed anchor 6 is provided on the upper end of the prestressed tendon 5 extending from the uppermost prefabricated component 2 in each component group 3.

[0034] In this embodiment, each precast component 2 in each component group 3 is provided with the second reserved channel 21 in the same way as in embodiment 1, except that the second reserved groove 22 is added to the bottommost precast component 2 in the group. Based on embodiment 1, in the subsequent assembly of each component group 3, its prestressed tie bar 5 is directly connected to the original lower prestressed tie bar 5, so that all precast components 2 achieve the overall tensile strength, and then all reach the design stress through the upper prestressed anchor 6 and achieve anchoring. The connection of the upper and lower prestressed tie bars 5 can be achieved at the second reserved groove 22 using tie bar connector 82, and the corresponding connector is selected according to whether the prestressed tie bar 5 is steel strand or steel bar. Of course, after the prestressed tie bar 5 is anchored, the grouting of the reserved duct and the pouring of the second reserved groove 22 are also carried out. Since the second reserved groove 22 and the corresponding second reserved duct 21 in the component group 3 are in a connected state, after the template is set up at the second reserved groove 22, the pouring of the second reserved groove 22 can be completed at the same time by grouting the reserved duct.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel connection node for precast concrete columns or shear walls, used to connect at least one layer of precast components on a foundation, characterized in that: The foundation has several upward-through first reserved channels, and a first reserved groove is provided at the lower end of each first reserved channel. Each layer of the precast component has a second reserved channel that is vertically through the first reserved channel. Prestressed tendons are installed through the second reserved channel and the corresponding first reserved channel. Prestressed tendons are provided at the lower end of the first reserved groove and the upper end of the uppermost second reserved channel.

2. The novel connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The prestressed tendon is filled with adhesive mortar between itself and the corresponding second and first reserved channels.

3. A novel connection node for precast concrete columns or shear walls as described in claim 2, characterized in that: The foundation is provided with a grouting port that connects to the lower end of the first reserved channel, and the uppermost precast component is provided with a grouting outlet that connects to the upper end of the corresponding second reserved channel.

4. A novel connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: A bonding mortar layer is provided between the bottommost precast component and the foundation, as well as between two adjacent layers of precast components. The bonding mortar layer has a mortar-free zone corresponding to the first reserved channel or the second reserved channel.

5. A novel connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The upper ends of both the first and second reserved channels are tapered, gradually widening from bottom to top.

6. A novel connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The prestressed tie rod is a prestressed steel strand or a prestressed steel bar.

7. A novel connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: Adhesive mortar was poured into the first reserved groove.

8. A novel connection node for precast concrete columns or shear walls as described in any one of claims 1 to 7, characterized in that: At least one component group is also installed on the uppermost precast component, and each component group includes at least one layer of the precast component; a second reserved groove is opened at the lower end of the lowermost precast component in each component group corresponding to each second reserved channel; the prestressed tendons in each component group are respectively connected to the prestressed tendons below; and a prestressed anchor is provided on the upper end of the prestressed tendon extending out of the uppermost precast component in each component group.

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