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

Sectional post-tensioned prestressed splicing node of assembled self-resetting concrete member Download PDF

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CN218714067U
CN218714067U CN202222976975.0U CN202222976975U CN218714067U CN 218714067 U CN218714067 U CN 218714067U CN 202222976975 U CN202222976975 U CN 202222976975U CN 218714067 U CN218714067 U CN 218714067U
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prestressed
concrete
tensioning
tendon
assembled self
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吴浩
兰晗
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Tongji University
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Tongji University
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Abstract

The utility model relates to an assembled is from prestressing force concatenation node of stretching out after segmentation of reset concrete member, this node include triangle-shaped lug (2) of plate and a plurality of subtend plate both sides evagination, the inside reservation of node has curved prestressing tendons pore (4), the surface of triangle-shaped lug (2) is provided with the recess, and the inside packing of this recess has micro-expansion concrete (7), and the top of this micro-expansion concrete (7) is provided with the ground tackle. Compared with the prior art, the utility model is suitable for various assembled self-resetting concrete members, such as self-resetting concrete columns, self-resetting concrete walls and the like; the method has the advantages that the segmented post-tensioning of the prestressed tendons in the assembled self-resetting concrete member is realized, and the functions of quick replacement or re-tensioning of the prestressed tendons and the like are realized; and the prefabricated building is completely prefabricated and assembled, so that the development requirements of the prefabricated building are met.

Description

Sectional post-tensioned prestressed splicing node of assembled self-resetting concrete member
Technical Field
The utility model belongs to the technical field of civil engineering, a assembled is from segmentation post-tensioned prestressing force concatenation node of reset concrete member is related to.
Background
In recent years, the development of seismic engineering research in China shows a trend of restoring functions from earthquake resistance, seismic isolation and reduction. With the development of scientific technology, labor cost becomes expensive, environmental pollution becomes a focus of the world, the building industry has higher and higher requirements for energy conservation and environmental protection, and prefabricated assembled structures are popular among people under the background and become a symbol of building industrialization. The combination of the building recoverability concept and the prefabricated assembly concept is one of the development trends of the civil engineering industry in the future.
In the research of the shockproof structure with the recoverable function, the self-resetting structure is a typical structural system. The self-resetting structural system is additionally provided with a device (such as a prestressed tendon, a belleville spring and the like) which can enable the structure or the member to be restored to the initial position on the basis of the swinging structure, so that the residual deformation of the structure or the member after the earthquake is reduced. The existing self-resetting system prestressed tendons are usually arranged in a full-length mode and are directly tensioned from the top of a component to a foundation part. However, for high-rise buildings, the prestressed tendons are too long in the same arrangement mode, and the problems that one-time tensioning is difficult in construction and the like exist. Meanwhile, due to the problem of prestress loss, the prestressed tendon is difficult to achieve the required prestress strength. And for the wall body of different floors, the required prestress is inconsistent, and if the same strength is adopted, resource waste exists to a certain extent. Meanwhile, whether the self-resetting structure can be quickly repaired after an earthquake is also an important basis for judging whether the structure is reasonable or not, and how to re-stretch the prestressed tendons of the high-rise building after the earthquake is also an existing problem.
Patent CN206053037U discloses a prefabricated sway shear wall of segmentation prestressing force from restoring to throne damage concentration, including the wall body that a plurality of bights arranged from bottom to top have the concentrated piece of damage, all be equipped with one end anchor in the wall body in each wall body, the unbonded prestressing tendons that the other end stretches out the wall body top, and still be equipped with reserved prestressing tendons pore on each wall body, be equipped with the ground tackle in the upper end in each reserved prestressing tendons pore, in adjacent wall body, the reserved prestressing tendons pore that is located the wall body of top corresponds with the unbonded prestressing tendons that sets up in the wall body that is located its below, after the unbonded prestressing tendons penetrated corresponding reserved prestressing tendons pore, its upper end was anchored by the ground tackle. But the patent does not fully consider the post-earthquake recoverability of the structure, and the internal prestressed tendons cannot be repaired and tensioned again after the earthquake; and because the anchorage devices are uniformly distributed in the structure, the tensioning is inconvenient in field tensioning.
Patent CN212715656U discloses an assembled prestressed structure of muscle is laid to curve, assembled prestressed structure includes prestressing force main frame roof beam, prestressing force secondary frame roof beam and prestressing force secondary beam, prestressing force main frame roof beam with prestressing force secondary frame roof beam is vertically and horizontally alternately arranged, prestressing force secondary beam with prestressing force secondary frame roof beam is parallel, and perpendicular to prestressing force main frame roof beam, prestressing force main frame roof beam prestressing force secondary frame roof beam with curve prestressing tendons has been arranged to the equipartition in the prestressing force secondary beam, prestressing tendons single-span segmentation is arranged, and the support department of roof beam is used as the gluten and is used as the base bar in striding, every stride prestressing tendons stretches into adjacent roof beam and is anchored. However, the arrangement form of the prestressed tendons in the patent is not suitable for vertical stress members such as columns, walls and the like, is not consistent with the stress characteristics of the vertical stress members, and the sectional tensioning mode of the prestressed tendons in the patent is difficult to realize in a vertical structure.
Patent CN109594652A discloses a prestressed assembly frame structure tensioned and anchored to a column bracket, wherein horizontal connection between a frame beam and a frame column is realized through the frame column bracket in the middle of the frame column, and vertical connection between the frame columns is realized through the column end bracket at the end part of the frame column; the connecting structure is suitable for connecting beams with columns and connecting beams with columns with superior performance, wherein the beams and the columns are connected through brackets bulged at the periphery of the middle part of the columns, and prestressed tendons are tensioned and anchored on the brackets to realize mutual connection; the columns are connected with the columns near the middle part of the height of the floor, corbels are bulged out on the peripheries of the upper end and the lower end of the lower end, and oblique prestress connecting steel bars are tensioned and anchored on the corbels. However, the arrangement form of the patent is not suitable for members with small cross-section width such as walls and the like, and the problems of steel bar collision and the like are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an assembled is from opening prestressing force concatenation node after segmentation of restoring to throne concrete member in order to overcome the defect that above-mentioned prior art exists, the utility model discloses the atress is reasonable, shakes the back and easily restores, and the construction is convenient.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides an assembled is from prestressing force concatenation node of stretching out after segmentation of reset concrete member, this node include the triangle-shaped lug of plate and a plurality of subtend plate both sides evagination, the inside reservation of node has curved prestressing tendons pore, arrange in the plane in prestressing tendons pore and adopt the biaxial symmetry form, the surface of triangle-shaped lug is provided with the recess, and the inside packing of this recess has C40 micro-expansion concrete, and this micro-expansion concrete's top is provided with the ground tackle.
Furthermore, considering the problem of the volume collision of the reinforcing steel bars, the width of the triangular lug is determined according to the diameter of the adopted prestressed tendon, generally 150-300mm, and the height is determined according to a curve arrangement mode, generally 300-600mm, so that the left and right staggering of the prestressed tendon ducts at the upper part and the lower part is ensured, and the collision is prevented.
Furthermore, an upper prestressed tendon pore passage is reserved in the plate, and the upper prestressed tendon pore passage extends from the top of the plate to the triangular lugs on two sides respectively.
Furthermore, the top of the groove on the lower surface of the triangular convex block is provided with a lower anchoring end of an upper prestressed tendon, and the upper prestressed tendon is anchored at the lower anchoring end to realize the overlapping of the prestressed tendons.
Furthermore, a lower prestressed tendon duct is reserved in the plate, and the lower prestressed tendon duct extends from the bottom of the plate to the triangular lugs on two sides respectively.
Furthermore, the top of the groove on the upper surface of the triangular bump is provided with an upper stretching end of a lower prestressed tendon, and the lower prestressed tendon is anchored at the upper stretching end to realize the overlapping of the prestressed tendons.
Furthermore, spiral stirrups are arranged near the top of the prestressed tendon duct by the triangular convex blocks so as to enhance the local stress requirements of the upper tensioning end and the lower anchoring end.
Furthermore, the bottom of the groove is provided with a bearing plate.
Further, after the tensioning operation is completed, the bearing plate bears C40 micro-expansion concrete to plug the groove so as to enhance the structural integrity.
Further, joint mortar is arranged between the node and the upper and lower components to increase the integrity of the assembled structure.
As a preferable technical scheme, the thickness of the joint mortar is 10-30mm.
The utility model discloses arrange triangle-shaped lug main objective in:
(1) In the post-earthquake repairing stage, repairing and re-tensioning operation is performed on the prestressed reinforcement in the damaged wall body;
(2) The cross section area at the same horizontal height is increased, the possibility of collision between the upper and lower prestressed tendon ducts and the anchoring end is reduced, and the method is applicable to walls with smaller width;
(3) The internal prestressed tendons are arranged in a curve, so that the line type of the internal curve cannot generate an overlarge curve angle, and the prestressed tendons are broken;
(4) The site construction operation is convenient, and the engineering efficiency is improved;
(5) The triangular bump arrangement conforms to the curve arrangement of the prestressed tendon pore channel, so that under the condition of reserving sufficient pore channel space, materials are saved as much as possible, and the maximized economic benefit is realized; meanwhile, the vertical stress characteristic of the wall body is met, and the functions of post-earthquake restoration, segmented tensioning, prestressed tendon lap joint and the like are realized under the condition of ensuring the structural stability.
And simultaneously, the utility model also provides a construction mode of assembled from the segmentation after-tension prestressing force concatenation node of reset concrete member, this construction mode includes following step:
the prestressed tendon pore canal in the node is closely aligned with the pore canals in the upper and lower components. After the assembly of the lower member on site is completed, a section of the node is installed at the upper part thereof. The prestressed tendon of the lower component penetrates from the upper stretching end of the triangular convex block and extends into the pore channel in the lower component. If the bottom of the lower component is a foundation, the prestressed tendon is anchored in the foundation; if the bottom is another node, then anchor in the lower anchorage end. And after the tensioning operation is finished, pouring C40 micro-expansion concrete into the groove to finish plugging.
In the post-earthquake repairing stage, when the overall structure is damaged and is within a controllable range, the prestressed tendons can be quickly and effectively tensioned again through the upper tensioning ends on the triangular lugs, C40 micro-expansion concrete is poured again to block the upper tensioning ends after tensioning operation is completed, and the structural integrity is enhanced. Thereby realizing the quick repair operation of the building structure after the earthquake.
And the sectional tensioning operation of the prestressed tendons of the upper and lower components is realized through the nodes. And because the node design has triangle-shaped lug, can be convenient realization prestressing tendons stretch-draw again after the earthquake, increased the area in the coplanar simultaneously, reduced the possible reinforcing bar collision problem that produces because of prestressing tendons overlap joint demand.
The utility model discloses main innovation point lies in:
the utility model relates to a main objective is for solving segmentation prestressing force from the relevant difficult point of reset structure application in assembly type structure. The sectional prestressed connecting joint for the assembled self-resetting concrete member is provided to realize the sectional tensioning of the prestressed tendons of the upper and lower members and simultaneously consider the restorability problem of the structure. A triangular lug is arranged in the middle of a node, and the upper and lower prestressed tendons are arranged according to a curve type, so that the upper and lower prestressed joints are realized through the node. To high-rise building, can be according to actual prestressing force segmentation demand, the application the utility model discloses realize that different partial component prestressing force size is controlled according to actual conditions. The utility model is mainly characterized in that the middle part of the utility model is provided with a triangular lug, which can rapidly complete the re-tensioning after earthquake. Not adopting the utility model discloses an existing segmentation prestressing force component, segmentation tensioning end can only bury inside the component, and can't stretch-draw the prestressing tendons again after the earthquake, can't realize the recoverable building theory. Simultaneously the utility model discloses also regard as prestressing tendons overlap joint district section simultaneously, adjust specially according to concrete overlap joint needs, realize that standard floor standard is prefabricated, connected node is special prefabricated to improve mill's preparation efficiency greatly. Simultaneously the utility model discloses have better universality, all can adjust the partial structure can directly come into operation according to the actual demand in most engineering reality, reduced the manpower and materials of the required cost of connecting elements redesign in the very big degree.
Compared with the prior art, the utility model has the advantages of it is following:
(1) The utility model realizes the prestressing force applied to the upper and lower segments of the building structure, thereby realizing the application of the self-restoring body system in the high-rise building through the segment tensioning design of the prestressing force, and breaking the limitation at present; meanwhile, according to the specific floor requirements, appropriate prestress can be adopted, so that the waste of materials and the corresponding construction difficulty are greatly reduced, and the flexibility and the rationality of design are improved;
(2) The utility model is suitable for various component forms, such as beams, columns, walls and the like, and can conveniently carry out corresponding adjustment on the specific node structure according to the specific engineering requirements without carrying out the design of connecting components again, and can be widely applied under most engineering conditions;
(3) The utility model discloses be provided with overhanging triangle-shaped lug, the stretch-draw again of completion prestressing force that can be comparatively convenient after the earthquake is assisted with other and shakes the after repair technique, realizes shaking the quick use of coming into operation again of back building.
Drawings
Fig. 1 is a schematic side view of a sectional post-tensioned prestressed splicing node of an assembled self-restoring concrete member according to an embodiment of the present invention;
fig. 2 is a schematic front view of a sectional post-tensioned prestressed splicing node of an assembled self-restoring concrete member according to an embodiment of the present invention;
fig. 3 is a detailed schematic view of a triangular bump according to an embodiment of the present invention;
fig. 4 is a perspective view of a three-dimensional model in which an upper tension end and a lower anchoring end are omitted from a segmented post-tensioned prestressed splice joint of an assembled self-restoring concrete member according to an embodiment of the present invention.
The notation in the figure is:
1-upper tension end, 2-triangular bump, 3-spiral stirrup, 4-prestressed tendon pore channel, 5-joint mortar, 6-bearing plate, 7-micro-expansion concrete and 8-lower anchoring end.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
a segmental post-tensioning prestress splicing node of an assembled self-resetting concrete member is used for connecting a plurality of prefabricated assembled concrete members on the upper portion and the lower portion of the node, and comprises a plate, an upper tensioning end 1, a wedge-shaped convex block 2, a spiral stirrup 3, a prestressed tendon channel 4, joint mortar 5, a bearing plate 6, C40 micro-expansion concrete 7 and a lower anchoring end 8, wherein the upper tensioning end 1, the wedge-shaped convex block 2, the spiral stirrup 3, the joint mortar 5 and the lower anchoring end 8 are arranged on the plate. Four pairs of triangular lugs 2 protrude outwards from two sides of the plate, a curved prestressed tendon pore passage 4 is reserved in the node and comprises an upper prestressed tendon pore passage and a lower prestressed tendon pore passage, the upper prestressed tendon pore passage 4 extends to the triangular lugs 2 on the two sides from the top of the plate respectively, micro-expansion concrete 7 is filled in a lower surface groove of the triangular lugs 2, a lower anchoring end 8 of the upper prestressed tendon is arranged at the top of the micro-expansion concrete 7, the upper prestressed tendon is anchored at the lower anchoring end 8, the lower prestressed tendon pore passage 4 extends to the triangular lugs 2 on the two sides from the bottom of the plate respectively, micro-expansion concrete 7 is filled in an upper surface groove of the triangular lugs 2, an upper tensioning end 1 of the lower prestressed tendon is arranged at the top of the micro-expansion concrete 7, and the lower prestressed tendon is anchored at the upper tensioning end 1. The width of the triangular lug 2 is determined according to the diameter of the adopted prestressed tendon, the width is 200mm, the height is determined according to a curve arrangement mode, the width is 400mm, and the upper and lower prestressed tendon ducts 4 are staggered left and right. The triangular convex block 2 is provided with a spiral stirrup 3 at the top of the prestressed tendon duct 4. The bottom of the groove is provided with a bearing plate 6, and the bearing plate 6 bears micro-expansion concrete 7 to plug the groove. Joint mortar 5 is arranged at joints of the nodes and the prefabricated parts.
A construction method of a segmental post-tensioned prestressing splicing node of an assembled self-resetting concrete member comprises the following steps:
the pre-stressed tendon pore canal 4 in the connecting node is closely aligned with the pore canals in the upper and lower components. After the assembly of the lower member on site is completed, a section of the node is installed at the upper part thereof. The prestressed tendon of the lower component penetrates from the upper stretching end 1 of the triangular convex block 2 and extends into the reserved hole channel in the lower component. If the bottom of the lower component is a foundation, the prestressed tendon is anchored in the foundation; if the bottom is another node, it is anchored in a lower anchoring end 8 provided in the node. And after the tensioning operation is finished, pouring micro-expansion concrete 7 into the reserved groove to finish plugging. And the segmental tensioning operation of the prestressed tendons of the upper and lower components is realized through the nodes. And because the node design has triangle-shaped lug 2, can be convenient realization prestressing tendons stretch-draw again after the earthquake, increased the area in the coplanar simultaneously, reduced the possible reinforcing bar collision problem that produces because of prestressing tendons overlap joint demand.
In the post-earthquake repairing stage, when the overall structure is damaged and is within a controllable range, the prestressed tendons can be quickly and effectively tensioned again through the upper tensioning ends 1 on the triangular lugs 2, and after tensioning operation is completed, micro-expansion concrete 7 is poured again to block the upper tensioning ends 1, so that the structural integrity is enhanced. Thereby realizing the quick repair operation of the building structure after the earthquake.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

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.
CN202222976975.0U 2022-11-09 2022-11-09 Sectional post-tensioned prestressed splicing node of assembled self-resetting concrete member Active CN218714067U (en)

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