CN218714067U - Sectional post-tensioned prestressed splicing node of assembled self-resetting concrete member - Google Patents

Abstract

The utility model relates to a segmental post-tensioned prestressed splicing node of an assembled self-resetting concrete component. The node includes a plate and several triangular bumps (2) that protrude from both sides of the opposite plate. A curved prestressed tendon channel (4) is reserved, and the surface of the triangular bump (2) is provided with a groove, and the inside of the groove is filled with micro-expansion concrete (7), and the micro-expansion concrete (7) Anchors are provided on the top. Compared with the prior art, the utility model is applicable to a variety of assembled self-resetting concrete components, such as self-resetting concrete columns, self-resetting concrete walls, etc.; it realizes segmental post-tensioning of prestressed tendons in assembled self-resetting concrete components , and realize the functions of rapid replacement or re-tensioning of prestressed tendons; it adopts full prefabricated assembly to meet the development needs of prefabricated buildings.

Description

Segmental post-tensioned prestressed splicing joint of a prefabricated self-resetting concrete member

technical field

The utility model belongs to the technical field of civil engineering, and relates to a segmented post-tensioned prestress splicing node of an assembled self-resetting concrete member.

Background technique

In recent years, the development of my country's earthquake engineering research has shown a trend from earthquake resistance, shock absorption and isolation to recoverable functions. With the development of science and technology, labor costs have become expensive, environmental pollution has become the focus of the world, and the construction industry has an increasing demand for energy conservation and environmental protection. In this context, prefabricated structures have been welcomed by people. , becoming a symbol of construction industrialization. Combining the concept of building recoverability with the concept of prefabrication is bound to be one of the development trends of the civil engineering industry in the future.

In the study of the existing recoverable earthquake-proof structures, the self-resetting structure is one of the more typical structural systems. On the basis of the rocking structure, the self-resetting structural system adds additional devices (such as prestressed tendons, butterfly springs, etc.) that can restore the structure or component to its original position, thereby reducing the post-earthquake residual deformation of the structure or component. The prestressed tendons of the existing self-resetting system are usually arranged in full length, and are directly stretched from the top of the member to the foundation. However, for high-rise buildings, if the same arrangement is adopted, the prestressed tendons will be too long, and there will be problems such as difficulty in one-time tensioning during construction. At the same time, due to the problem of prestress loss, it is difficult for prestress tendons to achieve the required prestress strength. Moreover, for the walls of different floors, the required prestress size is also inconsistent. If the same strength is used, there will be a certain degree of waste of resources. At the same time, for self-resetting structures, whether they can be quickly repaired after an earthquake is also an important basis for judging whether a structure is reasonable. How to re-tension the prestressed tendons of high-rise buildings after an earthquake is also an existing problem.

Patent CN206053037U discloses a segmented prestressed self-resetting damage concentrated prefabricated swing shear wall, including a plurality of walls arranged from bottom to top with damage concentration blocks at the corners, and each wall is provided with one end anchored to the wall In the body, the other end protrudes from the unbonded prestressed tendons above the wall, and each wall is also provided with a reserved prestressed tendon channel, and an anchor is provided at the upper end of each reserved prestressed tendon channel. In the wall, the reserved prestressed tendon channel in the upper wall corresponds to the unbonded prestressed tendon set in the lower wall, and the unbonded prestressed tendon penetrates into the corresponding reserved prestressed tendon After the reinforcement channel, its upper end is anchored by the anchor. However, this patent fails to fully consider the post-earthquake recoverability of the structure, and the internal prestressed tendons cannot be repaired and re-tensioned after the earthquake; and because the anchors are all arranged inside the structure, it is inconvenient to stretch on site .

Patent CN212715656U discloses an assembled prestressed structure with curved bars, the assembled prestressed structure includes a prestressed main frame beam, a prestressed secondary frame beam and a prestressed secondary beam, the prestressed main frame beam and the prestressed The prestressed secondary frame beams are arranged vertically and horizontally, the prestressed secondary beams are parallel to the prestressed secondary frame beams and perpendicular to the prestressed main frame beams, the prestressed main frame beams, the prestressed secondary Curved prestressed tendons are arranged in the frame beam and the prestressed secondary beam, and the prestressed tendons are arranged in sections in a single span, and are used as gluten at the support of the beam and as bottom reinforcement in the middle span. Prestressing tendons extend into adjacent beams and are anchored. However, the arrangement of prestressed tendons in this patent is not suitable for vertical stress components such as columns and walls, and does not conform to its stress characteristics, and its segmented tensioning method is difficult to achieve in vertical structures.

Patent CN109594652A discloses a prestressed assembled frame structure anchored to the column corbel by tensioning. The horizontal connection between the frame beam and the frame column is realized through the frame column corbel in the middle of the frame column. The legs realize the vertical connection between the frame columns; it is suitable for a more simplified and superior performance connection structure between beams and columns, columns and columns, in which the beams and columns are connected by corbels bulging around the middle of the columns and on the corbels The prestressed tendons are stretched and anchored to realize mutual connection; the columns are connected near the middle of the floor height, and corbels are bulged around the upper and lower ends of the connection, and the oblique prestressed connecting steel bars are tensioned and anchored on the corbels. However, the arrangement form of this patent is not suitable for members with small cross-sectional widths such as walls, and problems such as steel bar collisions are likely to occur.

Utility model content

The purpose of this utility model is to provide a piecewise post-tensioned prestressed splicing node of an assembled self-resetting concrete member in order to overcome the above-mentioned defects in the prior art. The utility model has reasonable force, easy repair after earthquake, and convenient construction.

The purpose of this utility model can be achieved through the following technical solutions:

The utility model provides a segmented post-tensioned prestressed splicing node of an assembled self-resetting concrete component. The node includes a plate and several triangular bumps protruding outward on both sides of the opposite plate. The inside of the node is reserved Curved prestressed tendon channels, the in-plane arrangement of the prestressed tendon channels adopts a biaxial symmetric form, the surface of the triangular bump is provided with a groove, and the inside of the groove is filled with C40 micro-expansion concrete. The top of the concrete is provided with anchors.

Further, considering the volume collision problem of steel bars, the width of the triangular bumps is determined according to the diameter of the prestressed tendons used, generally 150-300mm, and the height is determined according to the curve layout, generally 300-600mm, to ensure the prestressing of the upper and lower parts. The stress tendon channels are staggered left and right to prevent collisions.

Further, an upper prestressing tendon tunnel is reserved inside the panel, and the upper prestressing tendon tunnel extends from the top of the panel to the triangular projections on both sides respectively.

Further, the top of the groove on the lower surface of the triangular bump is provided with a lower anchoring end of the upper prestressing tendon, and the upper prestressing tendon is anchored to the lower anchoring end to realize overlapping of the prestressing tendon.

Further, a lower prestressing tendon tunnel is reserved inside the panel, and the lower prestressing tendon tunnel extends from the bottom of the panel to the triangular projections on both sides respectively.

Further, the top of the groove on the upper surface of the triangular bump is provided with the upper tension end of the lower prestressed tendon, and the lower prestressed tendon is anchored to the upper tension end to realize overlapping of the prestressed tendon.

Further, the triangular projections are arranged with spiral stirrups near the top of the prestressed tendon channel to enhance the local force requirements of the upper tension end and the lower anchor end.

Further, a pressure bearing plate is provided at the bottom of the groove.

Further, after the tensioning operation is completed, the pressure-bearing plate bears C40 micro-expansion concrete to seal the groove, so as to enhance the structural integrity.

Further, joint mortar is provided between the nodes and the upper and lower components to increase the integrity of the fabricated structure.

As a preferred technical solution, the thickness of the joint mortar is 10-30mm.

The main purpose of arranging triangular bumps in the utility model is to:

(1) It is convenient for the post-earthquake repair stage to repair and re-tension the prestressed tendons in the damaged wall;

(2) Increase the cross-sectional area at the same horizontal height, reduce the possibility of collision between the upper and lower prestressed tendon channels and anchorage ends, and can be applied to walls with smaller widths;

(3) It is beneficial for the internal prestressed tendons to be arranged in a curved line, so that the internal curve shape will not appear too large a curved angle, which will cause the prestressed tendons to be broken;

(4) Facilitate on-site construction operations and improve engineering efficiency;

(5) The arrangement of triangular bumps conforms to the curved layout of the prestressed tendon channels, and saves materials as much as possible while retaining sufficient channel space to maximize economic benefits; at the same time, it also conforms to the vertical force characteristics of the wall, Under the condition of ensuring the stability of the structure, functions such as post-earthquake repair, segmental tensioning, and prestressed tendon lapping can be realized.

At the same time, the utility model also provides a construction method of segmented post-tensioned prestressed splicing joints of assembled self-resetting concrete components. The construction method includes the following steps:

The prestressed tendon channels in the nodes are closely aligned with the internal channels of the upper and lower members. After the assembly of the lower part of the site is completed, a section of node is installed on its upper part. The prestressed tendon of the lower component penetrates from the upper tension end at the triangular projection and goes deep into the tunnel in the lower component. If the bottom of the lower member is the foundation, the prestressed tendon is anchored in the foundation; if the bottom is another node, it is anchored in the lower anchoring end. After the tensioning operation is completed, C40 micro-expansion concrete is poured into the groove to complete the plugging.

In the post-earthquake repair stage, when the damage to the overall structure is within a controllable range, the prestressed tendons can be re-tensioned quickly and effectively through the upper tension end on the triangular bump, and C40 can be re-cast after the tensioning operation is completed. Micro-expansion concrete seals the upper tension end to enhance structural integrity. In order to realize the rapid repair work of the building structure after the earthquake.

The segmental tensioning operation of the prestressed tendons of the upper and lower members is realized through nodes. And because the nodes are designed with triangular bumps, the prestressed tendons can be re-tensioned conveniently after the earthquake, and the area in the same plane is increased, reducing the possible reinforcement collision problems caused by the overlapping requirements of prestressed tendons .

The utility model main innovation point is:

The main purpose of the design of the utility model is to solve the relevant difficulties in the application of segmented prestressed self-resetting structures in prefabricated buildings. A segmented prestressed joint for prefabricated self-resetting concrete members is proposed to realize the segmental tensioning of the prestressed tendons of the upper and lower members, while taking into account the problem of structural restorability. It is proposed to arrange a triangular bump in the middle of the node, and based on this, the curved prestressed tendon is arranged, and the upper and lower prestressed joints are realized through the node. For high-rise buildings, the utility model can be used to realize the control of the prestress size of different components according to the actual situation according to the actual prestress segmental requirements. The main feature of the utility model is that the middle part is provided with a triangular protrusion, which can quickly complete the re-tensioning during post-earthquake repair. For the existing segmented prestressed components that do not adopt the utility model, the segmented tension end can only be buried inside the component, and the prestressed tendons cannot be re-tensioned after the earthquake, and the concept of restorable architecture cannot be realized. At the same time, the utility model is also used as a prestressed tendon lap joint section, which is specially adjusted according to specific lap joint needs to realize standard prefabrication of standard floors and special prefabrication of connection nodes, thereby greatly improving factory production efficiency. At the same time, the utility model has better universality. In most engineering practices, some structures can be adjusted according to actual needs and can be directly put into use, which greatly reduces the manpower required for the redesign of connecting components. physical resources.

Compared with the prior art, the utility model has the following advantages:

(1) The utility model realizes applying prestress to the upper and lower sections of the building structure, thereby realizing the application of the self-resetting system in high-rise buildings through the segmental tension design of the prestress, breaking the current limitations; at the same time, it can According to the specific floor requirements, the appropriate prestress is adopted, which greatly reduces the waste of materials and the corresponding construction difficulty, and increases the flexibility and rationality of the design;

(2) The utility model is applicable to a variety of component forms, such as beams, columns, walls, etc., and can conveniently adjust the specific node structure according to specific engineering requirements without redesigning the connecting components. It can be widely used under most engineering conditions;

(3) The utility model is provided with protruding triangular bumps, which can conveniently complete the re-tensioning of the prestress after the earthquake, supplemented by other post-earthquake repair techniques, and quickly put the building back into use after the earthquake.

Description of drawings

Fig. 1 is the schematic diagram of the side view of the segmented post-tensioned prestressed splicing node of the assembled self-resetting concrete member in the embodiment of the utility model;

Fig. 2 is the schematic diagram of the front view of the segmented post-tensioned prestressed splicing node of the assembled self-resetting concrete member in the embodiment of the utility model;

Fig. 3 is a detailed schematic diagram of a triangular bump in an embodiment of the utility model;

Fig. 4 is a perspective view of a three-dimensional model of the segmented post-tensioned prestressed splicing nodes of the assembled self-resetting concrete member in the embodiment of the utility model, omitting the upper tension end and the lower anchorage end.

Instructions for marks in the figure:

1—upper tension end, 2—triangular bump, 3—spiral stirrup, 4—prestressed tendon tunnel, 5—joint mortar, 6—pressure bearing plate, 7—micro-expansion concrete, 8—lower anchorage end.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Example:

A segmented post-tensioned prestressed splicing node of an assembled self-resetting concrete component, which is used to connect several prefabricated assembled concrete components at the upper and lower parts of the node, as shown in Figures 1 to 4, including a plate and an upper tension end 1, Wedge-shaped bump 2, spiral stirrup 3, prestressed tendon channel 4, joint mortar 5, pressure bearing plate 6, C40 micro-expansion concrete 7 and lower anchoring end 8. Four pairs of triangular protrusions 2 protrude on both sides of the plate, and there are curved prestressing tendon channels 4 reserved inside the nodes, including the upper and lower prestressing tendon channels, and the upper prestressing tendon channels 4 respectively extend from the top of the plate To the triangular bumps 2 on both sides, the lower surface groove of the triangular bump 2 is filled with micro-expansion concrete 7, the top of the micro-expansion concrete 7 is provided with the lower anchorage end 8 of the upper prestressed tendon, and the upper prestressed tendon is anchored to the lower part The anchoring end 8 and the lower prestressed tendon channel 4 extend from the bottom of the plate to the triangular bumps 2 on both sides respectively, the upper surface groove of the triangular bump 2 is filled with micro-expansion concrete 7, and the top of the micro-expansion concrete 7 is set There is an upper tension end 1 with a lower prestressed tendon, and the lower prestressed tendon is anchored to the upper tension end 1 . The width of the triangular bump 2 is determined according to the diameter of the prestressed tendon used, which is 200mm, and the height is determined according to the curved layout method, which is 400mm. The upper and lower prestressed tendon channels 4 are staggered left and right. The triangular bump 2 arranges the spiral stirrup 3 on the top of the prestressing tendon channel 4 . A pressure bearing plate 6 is provided at the bottom of the groove, and the pressure bearing plate 6 carries micro-expansion concrete 7 to seal the groove. Joint mortar 5 is arranged at joints of joints and prefabricated components.

A construction method of a segmented post-tensioned prestressed splicing joint of an assembled self-resetting concrete member, the construction method comprising the following steps:

The reserved prestressed tendon channel 4 in the connection node is closely aligned with the inner channel of the upper and lower members. After the assembly of the lower part of the site is completed, a section of node is installed on its upper part. The prestressed tendon of the lower component penetrates from the upper tension end 1 at the triangular bump 2 and goes deep into the reserved channel in the lower component. If the bottom of the lower component is the foundation, the prestressed tendons are anchored in the foundation; if the bottom is another node, they are anchored in the lower anchoring end 8 provided in the node. After the tensioning operation is completed, micro-expansion concrete 7 is poured into the reserved groove to complete the plugging. The segmental tensioning operation of the prestressed tendons of the upper and lower members is realized through nodes. And because the nodes are designed with triangular bumps 2, the prestressed tendons can be re-tensioned conveniently after the earthquake, and at the same time, the area in the same plane is increased, and the possible reinforcement collision due to the overlapping requirements of the prestressed tendons is reduced. question.

In the post-earthquake repair stage, when the damage to the overall structure is within a controllable range, the prestressed tendons can be re-stretched quickly and effectively through the upper tension end 1 on the triangular bump 2, and then re-stretched after the stretching operation is completed. The micro-expansion concrete 7 is poured to seal the upper tension end 1 to enhance the structural integrity. In order to realize the rapid repair work of the building structure after the earthquake.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the category of the utility model should be within the protection scope of the utility model.

Claims (10)

1. The sectional post-tensioning prestress splicing node of the assembled self-resetting concrete member is characterized by comprising a plate and a plurality of triangular lugs (2) protruding outwards from two sides of the plate, a curve-shaped prestressed tendon pore passage (4) is reserved in the node, a groove is formed in the surface of each triangular lug (2), micro-expansion concrete (7) is filled in the groove, and an anchorage device is arranged at the top of each micro-expansion concrete (7).

2. The segmental post-tensioning prestressed splicing joint of an assembled self-resetting concrete component according to claim 1, wherein the width of the triangular lug (2) is 150-300mm, the height of the triangular lug is 300-600mm, and the prestressed tendon ducts (4) at the upper part and the lower part are staggered from side to side.

3. The segmental post-tensioning prestressed splice joint of an assembled self-restoring concrete component according to claim 1, characterized in that an upper tendon duct (4) is reserved in the interior of the slab, and the upper tendon duct (4) extends from the top of the slab to the triangular lugs (2) on both sides, respectively.

4. The segmental post-tensioning prestressed splicing joint of an assembled self-resetting concrete component according to claim 3, characterized in that the top of the groove of the lower surface of the triangular projection (2) is provided with a lower anchoring end (8) of an upper tendon, and the upper tendon is anchored to the lower anchoring end (8).

5. The segmental post-tensioning prestressed splice joint for an assembled self-restoring concrete component according to claim 1, characterized in that the interior of the slab is reserved with a lower tendon duct (4), which lower tendon duct (4) extends from the bottom of the slab to the triangular projections (2) on both sides, respectively.

6. The segmental post-tensioning prestressed splicing joint of an assembled self-resetting concrete component according to claim 5, characterized in that the top of the groove on the upper surface of the triangular projection (2) is provided with an upper tensioning end (1) of a lower tendon, and the lower tendon is anchored to the upper tensioning end (1).

7. The segmental post-tensioned prestressed splice joint for an assembled self-restoring concrete element according to claim 1, characterized in that said triangular projections (2) are provided with helical stirrups (3) at the top of the tendon ducts (4).

8. The segmental post-tensioned prestressed splice joint of an assembled self-restoring concrete element according to claim 1, characterized in that said groove is provided at its bottom with a bearing plate (6).

9. The segmental post-tensioned prestressed splice joint of an assembled self-restoring concrete element according to claim 8, characterized in that said bearing plate (6) carries micro-expansive concrete (7).

10. The segmental post-tensioned prestressed splicing joint of an assembled self-restoring concrete element according to claim 1, characterized in that joint mortar (5) is arranged between said joint and the upper and lower elements.

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