A new sleeve connection joint for precast concrete columns or shear walls

Abstract

This utility model discloses a novel sleeve connection node for precast concrete columns or shear walls, relating to the field of prefabricated building technology. It is used for connecting upper and lower precast components. The upper precast component has an upper reinforcing bar embedded in its lower end face, and the lower precast component has a connecting sleeve embedded in its top face for inserting the upper reinforcing bar. The connecting sleeve includes a flared section at the top and a gripping section in the middle. The flared section gradually widens from bottom to top, and the inner wall of the gripping section has a protruding gripping structure. A sleeve fixing structure is provided between the lower end of the connecting sleeve and the lower precast component. This utility model improves assembly convenience, ensures gripping force, facilitates grouting, and promotes full grouting.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, and in particular to a novel sleeve 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 lower end of the upper precast component (column or shear wall) has a precast reinforcing bar sleeve embedded in it. 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] In this type of sleeve connection joint, the lower opening of the sleeve is relatively small, and it is difficult to observe whether the lower reinforcing bars are aligned during assembly. This makes it extremely difficult to insert the lower reinforcing bars from the precast components into the reinforcing bar sleeves. The more lower reinforcing bars there are, the more difficult the insertion operation becomes. If even one lower reinforcing bar is misaligned, assembly cannot be completed. Furthermore, after the lower reinforcing bars are inserted into the reinforcing bar sleeves, each sleeve needs to be grouted individually. The grouting process is very cumbersome, and it is difficult to achieve the required grout fullness, which can lead to serious structural safety issues.

[0004] To address this, the applicant filed a utility model patent with publication number "CN222730747U," disclosing a connection node scheme in which a connecting sleeve is set on the lower precast component and the upper reinforcing bar on the upper precast component is inserted into the connecting sleeve. This scheme effectively solves the problems of cumbersome grouting and insufficient grout fullness, and also improves the ease of assembly of the upper and lower precast components to a certain extent. However, in order to ensure the bonding force between the internal grout and the inserted upper reinforcing bar after connection, the connecting sleeve can only have a small opening at the upper end plate. Therefore, the clearance between the upper reinforcing bar and the opening is small. For precast components with multiple reinforcing bars that need to be inserted, the actual assembly process still does not achieve the ideal convenience, and further improvements are needed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a new type of sleeve connection node for precast concrete columns or shear walls that improves assembly convenience, ensures gripping force, facilitates grouting, and facilitates full grouting.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a novel sleeve connection node for precast concrete columns or shear walls, used for connecting upper precast components and lower precast components. The upper precast component has an upper reinforcing bar embedded in it, extending from its lower end face. The lower precast component has a connecting sleeve embedded in its top surface for inserting the upper reinforcing bar. The connecting sleeve includes a flared section at the top and a gripping section in the middle. The flared section gradually widens from bottom to top, and a gripping structure protrudes from the inner wall of the gripping section. A sleeve fixing structure is provided between the lower end of the connecting sleeve and the lower precast component.

[0007] As a preferred technical solution, the cylindrical wall of the gripping section is provided with a shrinking joint that contracts inward, and the shrinking joint constitutes the gripping structure.

[0008] As a preferred technical solution, the sleeve fixing structure includes an anchor plate fixedly welded to the bottom end of the connecting sleeve, and an anchoring steel bar is fixedly welded to the anchor plate.

[0009] As a preferred technical solution, the sleeve fixing structure includes a fixing threaded sleeve fixedly disposed at the bottom end of the connecting sleeve, and a lower reinforcing bar is pre-embedded in the lower prefabricated component, the upper end of the lower reinforcing bar being threadedly connected to the fixing threaded sleeve.

[0010] By adopting the above technical solution, a novel sleeve connection node for precast concrete columns or shear walls is provided for connecting upper and lower precast components. The upper precast component has an upper reinforcing bar embedded in its lower end face, and the lower precast component has a connecting sleeve embedded in its top face for inserting the upper reinforcing bar. The connecting sleeve includes a flared section at the top and a gripping section in the middle. The flared section gradually widens from bottom to top, and the gripping section has a protruding gripping structure on its inner wall. A sleeve fixing structure is provided between the lower end of the connecting sleeve and the lower precast component. This utility model improves the connecting sleeve by providing a structure with a flared section and a gripping section. The flared section utilizes a larger opening and a tapered guide, making it easier to insert the corresponding upper reinforcing bar, significantly improving the ease of assembly. Before insertion, grout is injected into the connecting sleeve. Grouting is convenient and facilitates full grouting. After insertion, once the grout reaches the design strength, the gripping structure of the gripping section can generate a good gripping force between the grout and the inserted upper steel bar, promoting the connection between the upper and lower precast components to form a better tensile strength. Attached Figure Description

[0011] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0012] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0013] Figure 2 This is an enlarged structural schematic diagram of one of the connecting sleeves in one embodiment of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0015] Figure 4 This is an enlarged structural schematic diagram of one of the connecting sleeves in Embodiment 2 of this utility model;

[0016] Figure 5 This is a structural schematic diagram of the connection nodes of existing prefabricated components.

[0017] In the diagram: 1-Upper precast component; 11-Upper reinforcing bar; 2-Lower precast component; 21-Lower reinforcing bar; 3-Connecting sleeve; 31-Flanged section; 32-Gathering section; 33-Contraction joint; 4-Sleeve fixed connection structure; 41-Anchor plate; 42-Anchoring reinforcing bar; 43-Fixed threaded sleeve; 81-Gluing mortar; 82-Mortar; 9-Reinforcing bar sleeve. Detailed Implementation

[0018] 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.

[0019] Example 1: As Figure 1 and Figure 2 As shown, a novel sleeve connection node for precast concrete columns or shear walls is used to connect the upper precast component 1 and the lower precast component 2, for example, to connect precast concrete columns to precast concrete columns, or to connect precast concrete shear walls to precast concrete shear walls, or to connect precast concrete columns to precast concrete shear walls. This embodiment does not impose any limitations on this.

[0020] The upper precast component 1 has an upper reinforcing bar 11 embedded in its lower end face, and the lower precast component 2 has a connecting sleeve 3 embedded at its top end face for inserting the upper reinforcing bar 11. It is known that before connection, grout 81 is injected into the connecting sleeve 3. The connecting sleeve 3 is open at the top, allowing for pre-injection of the grout 81, facilitating grouting and ensuring full grouting. Furthermore, mortar 82 is laid on the upper end face of the lower connecting component before connection to ensure full grouting of the upper precast component 1 after connection.

[0021] The connecting sleeve 3 described in this embodiment includes a flared section 31 at the top and a gripping section 32 in the middle. The flared section 31 is gradually widened from bottom to top, that is, the flared section 31 is roughly a tapered structure that widens upward. This larger opening and tapered guide makes it easier for the upper reinforcing bar 11 to be inserted into the corresponding connecting sleeve 3, which significantly improves the ease of assembly.

[0022] The inner wall of the gripping section 32 has a protruding gripping structure. Through this gripping structure, after the mortar 81 in the connecting sleeve 3 reaches its design strength, a good gripping force can be formed between the mortar 81 and the inserted upper reinforcing bar 11, promoting a better tensile strength in the connection between the upper and lower prefabricated components 2. In this embodiment, the cylindrical wall of the gripping section 32 is provided with an inwardly contracting joint 33, which constitutes the gripping structure. Therefore, the connecting sleeve 3 can be integrally machined from steel pipe or integrally cast, without limitation.

[0023] A sleeve fixing structure 4 is provided between the lower end of the connecting sleeve 3 and the lower prefabricated component 2 to achieve a fixed connection between the connecting sleeve 3 and the lower prefabricated component 2. In this embodiment, the sleeve fixing structure 4 includes an anchor plate 41 fixedly welded to the bottom end of the connecting sleeve 3, and an anchoring steel bar 42 is fixedly welded to the anchor plate 41. Furthermore, the gripping structure in this embodiment is implemented using a contraction joint 33, which also forms a good anchoring effect with the lower prefabricated component 2 at the gripping section 32, resulting in a high-strength fixed connection between the connecting sleeve 3 and the lower prefabricated component 2.

[0024] In this embodiment, during construction, the connecting sleeve 3 is first filled with grout 81. The connecting sleeve 3 has an open top and an enlarged opening, which facilitates grouting and reduces the likelihood of air pockets after grouting, thus ensuring full grouting. Mortar 82 is laid on the upper surface of the lower precast component 2. Then, the upper precast component 1 is assembled by inserting its upper reinforcing bars 11 into the corresponding connecting sleeve 3. The larger opening and tapered guide of the flared section 31 of the connecting sleeve 3 make insertion easier, significantly improving assembly convenience. After assembly, the planar positioning and verticality of the upper precast component 1 are adjusted and temporarily fixed. Once the grout 81 in the connecting sleeve 3 reaches its design strength, the temporary support is removed, completing the assembly connection between the upper precast component 1 and the lower precast component 2. At this point, the fixed connection between the connecting sleeve 3 and the lower precast component 2, as well as the gripping effect of the gripping section 32, promotes good tensile strength between the upper precast component 1 and the lower precast component 2, resulting in high connection strength.

[0025] Example 2: Figure 3 and Figure 4As shown, the difference between this embodiment and Embodiment 1 is that the sleeve fixing structure 4 includes a fixing threaded sleeve 43 fixedly disposed at the bottom end of the connecting sleeve 3, and a lower reinforcing bar 21 is pre-embedded in the lower prefabricated component 2, the upper end of the lower reinforcing bar 21 being threadedly connected to the fixing threaded sleeve 43. In this embodiment, the lower reinforcing bar 21 pre-embedded in the lower prefabricated component 2 is directly used to form a connection with the connecting sleeve 3, which can also form a high-strength connection. The fixing threaded sleeve and the connecting sleeve 3 can be welded together or mechanically extruded and fixed together; no limitation is made here.

[0026] 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 sleeve connection node for precast concrete columns or shear walls, used for connecting upper and lower precast components, wherein an upper reinforcing bar is pre-embedded on the upper precast component extending from its lower end face, and a connecting sleeve for inserting the upper reinforcing bar is pre-embedded at the top face of the lower precast component, characterized in that: The connecting sleeve includes a flared section at the top and a gripping section in the middle. The flared section gradually widens from bottom to top, and a gripping structure is formed protruding on the inner wall of the gripping section. A sleeve fixing structure is provided between the lower end of the connecting sleeve and the lower prefabricated component.

2. The novel sleeve connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The cylindrical wall of the gripping section is provided with a shrinking joint that contracts inward, and the shrinking joint constitutes the gripping structure.

3. The novel sleeve connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The sleeve fixing structure includes an anchor plate fixedly welded to the bottom end of the connecting sleeve, and anchoring steel bars are fixedly welded to the anchor plate.

4. The novel sleeve connection node for precast concrete columns or shear walls as described in claim 1, characterized in that: The sleeve fixing structure includes a fixing threaded sleeve fixedly disposed at the bottom end of the connecting sleeve, and a lower reinforcing bar is pre-embedded in the lower prefabricated component, the upper end of the lower reinforcing bar being threadedly connected to the fixing threaded sleeve.

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