Prefabricated cross-layer column provided with short cantilever and used for prestress full-assembly type frame structure

Abstract

The invention relates to a prefabricated cross-layer column provided with a short cantilever and used for a prestress full-assembly type frame structure. The prefabricated cross-layer column comprises a prefabricated column body, the short cantilever, a column top embedded steel plate and the like. The short cantilevers are evenly and fixedly connected to the side wall, at the corresponding height, of the prefabricated column body at intervals in the height direction of the prefabricated column body. The upper part of the outer end of the short cantilever is provided with a tongue-and-groove structure; prestressed tendon hole channels are symmetrically formed in the left side and the right side of the vertical end face of the outer side of the short cantilever and the tongue-and-groove structure of the short cantilever, and the prestressed tendon hole channels sequentially penetrate through the short cantilever and the prefabricated column body and are perpendicular to the prefabricated column body; the column top embedded steel plate is correspondingly arranged at the top end of the prefabricated column body; a groove structure is arranged in the middle of the lower end face of the prefabricated column body. Bolt holes are formed in the upper portions of the left side and the right side of the short cantilever correspondingly. Compared with the prior art, the method has the main characteristics that a plurality of layers of frame columns are integrally prefabricated, the number of prefabricated column joints is reduced, the integrity is good, the self-resetting performance is achieved, and the method can be repeatedly used and adapts to complex environmental conditions.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated concrete structures in construction engineering, and in particular to a prefabricated cross-layer column with a short cantilever for a prestressed fully assembled frame structure. Background Art

[0002] With the continuous development of new building industrialization, the research and application of prefabricated frame structures are becoming more and more extensive, including prefabricated public building frames, residential buildings, etc. Frame columns are key lateral force-resistant components in the structure, and their splitting scheme and connection form are key technical issues in the application of prefabricated frame structures. The node connection form and connection structure of prefabricated frame structures have a significant impact on structural safety, economy, construction and durability.

[0003] The existing technology has the following defects: (1) The connection of prefabricated frame columns mainly adopts wet joints such as post-cast concrete, sleeve grouting, and grout anchor overlap. The process is complex, the construction quality is uncontrollable and difficult to detect. (2) The structural design adopts a layered assembly scheme, that is, the frame columns are split into nodes by layer, the frame beams and columns are prefabricated separately, and the beam-column nodes are connected. The structure is complex, there are many prefabricated column segments, the number of joints is large, and the installation efficiency is low. (3) The design of prefabricated frame beams adopts composite beams, etc., and a large number of temporary supports and formworks are still required on site for wet operations. (4) The connection parts of prefabricated columns, beams, and slabs are reinforced, which makes the production, transportation, storage and installation of components difficult. (5) Since the main components such as prefabricated frame beams and columns are all wet-connected, they cannot be quickly built and reused. It is not economical and reasonable to use them for temporary housing such as disaster relief resettlement housing, and they have poor adaptability to complex environmental conditions such as cold, plateaus and high altitudes.

[0004] In summary, in order to give full play to the technical advantages of prefabricated buildings and achieve technical goals such as rapid construction, adaptation to complex environmental conditions, reusability and simple construction, it is urgent to develop a new type of frame column. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a prefabricated cross-story column with a short cantilever for a prestressed fully assembled frame structure, which realizes full dry connection, rapid prototyping, reuse and easy disassembly and assembly through post-tensioning prestressing compression welding, aiming to provide a solution for the full assembly design and construction of frame columns, so as to improve construction efficiency and reduce construction costs.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention proposes a prefabricated cross-story column with a short cantilever for a prestressed fully assembled frame structure, comprising a prefabricated column body, a short cantilever and a pre-embedded steel plate at the top of the column; the short cantilever is fixedly connected to the side wall of the prefabricated column body at a corresponding height at uniform intervals along the height direction of the prefabricated column body; a tongue and groove structure is provided at the upper portion of the outer end of the short cantilever; prestressed tendon holes are symmetrically provided on the left and right sides of the outer vertical end face of the short cantilever and its tongue and groove structure, and the prestressed tendon holes penetrate the short cantilever and the prefabricated column body in turn and are perpendicular to the prefabricated column body; the pre-embedded steel plate at the top of the column is correspondingly arranged at the top of the prefabricated column body; a groove structure is provided in the middle portion of the lower end face of the prefabricated column body; bolt holes are respectively provided at the upper portions of the left and right sides of the short cantilever.

[0008] Furthermore, beam flanks are provided on one side or both sides of the short cantilever; and the beam flanks are located below the bolt holes.

[0009] Furthermore, prestressed tendon holes of corresponding number and position are provided between the embedded steel plate at the top of the column and the periphery of the groove structure.

[0010] Furthermore, the reserved channels of the longitudinal and transverse short cantilevers at the same height position of the prefabricated column body are staggered along the column height.

[0011] Furthermore, the cross-sectional shape of the prefabricated column body is rectangular, circular, L-shaped or T-shaped.

[0012] Furthermore, the groove structure is in the shape of a regular quadrangular pyramid, and its structure and geometric dimensions are adapted to the flange structure reserved on the top surface of the base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) Prefabricate several layers of frame columns as a whole to reduce the number of joints in the prefabricated columns, improve integrity, and facilitate structural earthquake resistance.

[0015] (2) The cross-story columns with short cantilevers are fully prefabricated and assembled, with a high degree of industrialization, green and efficient, and controllable production quality and construction period.

[0016] (3) Prefabricated columns and foundations, and prefabricated notched beam sections are all assembled using straight-line post-tensioning prestressing compression joints. The short cantilever and prefabricated floor slab are connected through beam side supports and high-strength bolts, giving full play to the technical advantages of prestressed technology, bolt nodes, and prefabricated structures, and achieving technical goals such as easy assembly, disassembly, and self-reset.

[0017] (4) The precast column split design adopts a split beam, column and cross-layer scheme. By prefabricating the cross-layer columns and short cantilevers as a whole, the beam-column joints are moved outward to avoid weakening the core area of ​​the frame node and improve the stress state.

[0018] (5) The tongue-and-groove joint sections at the ends of prefabricated columns and short cantilever beams have no protruding or pre-embedded reinforcement, which facilitates production, transportation and storage.

[0019] (6) The prefabricated floor slab is placed on the side of the beam and further connected to the adjacent prefabricated frame beams through high-strength bolts. The top of the frame beam is flush with the top of the floor slab, which can effectively reduce the height of the beam section, ensure the room clearance, and enhance the integrity of the floor structure.

[0020] (7) The groove structure at the bottom of the prefabricated column and the foundation flange structure are both in the shape of a regular quadrangular pyramid, which can improve the positioning accuracy during installation and the assembly efficiency. When the load is applied, the prefabricated column can be allowed to rotate around the flange while preventing the movement of the column base.

[0021] (8) The prefabricated column connection nodes have clear force transmission, simple structure, reliable connection, reusability, adaptability to complex environmental conditions, and high construction flexibility.

[0022] In summary, the application of the technical solution of the present invention can solve the problems existing in the prior art, such as the large number of joints of prefabricated columns, complex node processes, many wet operations on site, low industrialization and non-reusability. The present invention can realize truly prefabricated buildings and achieve green construction, thereby achieving better economic and technical indicators. Therefore, it has a good prospect for promotion and application in fully prefabricated concrete frame structures, and is particularly suitable for low-rise temporary or permanent houses that require rapid prototyping and detachability, such as earthquake-resistant and disaster relief houses, railway station structure supporting houses, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention applied to a corner column, a side column and a center column;

[0025] Figure 3 It is a side structural schematic diagram of a two-layer frame assembled with the present invention and prefabricated notched beam sections.

[0026] Among them, the figure markings are: 1-prefabricated column body, 2-short cantilever, 3-beam side, 4-tongue and groove structure, 5-prestressed tendon channel, 6-bolt hole, 7-embedded steel plate on column top, 8-groove structure, 9-prefabricated notched beam section. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0029] See attached Figure 1 The specific structure of an embodiment of a prefabricated cross-layer column with a short cantilever for a prestressed fully assembled frame structure proposed by the present invention is given. The cross-layer column can be divided into a corner column, a middle column and a side column according to the position. This embodiment takes the middle column as an example, and includes a prefabricated column body 1, a short cantilever 2 and a pre-embedded steel plate 7 at the top of the column.

[0030] The cross-sectional shape of the prefabricated column shaft 1 can be rectangular, circular, L-shaped, T-shaped or other special-shaped cross-sections. In this embodiment, the cross-sectional shape of the prefabricated column shaft 1 is rectangular; the short cantilever 2 is evenly spaced in two layers along the height direction of the prefabricated column shaft 1, and the number of each layer is three groups, which are respectively fixedly connected to the side walls of the prefabricated column shaft 1 at the corresponding height, and are arranged orthogonally to the column shaft and distributed vertically and horizontally.

[0031] The upper part of the outer end of the short cantilever 2 is provided with a tongue-and-groove structure 4; the left and right sides of the outer vertical end faces of the short cantilever 2 and its tongue-and-groove structure 4 are symmetrically provided with prestressed tendon holes 5, and the prestressed tendon holes 5 sequentially penetrate the short cantilever 2 and the precast column shaft 1 and are perpendicular to the precast column shaft 1, and the prestressed tendon holes 5 on a group of short cantilevers 2 correspond to each other; and the prestressed tendon holes 5 of the longitudinal and transverse short cantilevers 2 at the same height position of the precast column shaft 1 are staggered along the column height; bolt holes 6 are respectively provided on the upper part of the left and right sides of the short cantilever 2. The reserved prestressed tendon holes of each short cantilever 2 are symmetrically arranged along the beam cross section, vertically penetrate the column shaft, and the two ends of the prestressed tendon in the precast beam are respectively anchored to the outer surface of the corresponding side column or corner column.

[0032] The column top embedded steel plate 7 is correspondingly arranged at the top of the prefabricated column body. The plane shape and size of the steel plate, the position and number of reserved channels, etc. are consistent with the cross-section of the prefabricated column body 1. During the production of the component, the steel plate can be used as a column end template, and is cast integrally with the prefabricated column body 1 through anchor bars. During installation and use, it is used as a column end prestressed steel bar anchor pad to improve the stress state of the column top.

[0033] A groove structure 8 is provided in the middle of the lower end surface of the prefabricated column body 1; prestressed tendon holes 5 that penetrate the column body and have corresponding number and position are provided between the column top embedded steel plate 7 and the surrounding of the groove structure 8.

[0034] In this embodiment, a beam wing 3 is provided on one or both sides of the short cantilever 2; the beam wing 3 is located below the bolt hole 6. The wing beam on the short cantilever 2 is a connecting portion between the frame beam and the prefabricated floor slab, and is used to provide vertical support for the prefabricated floor slab. At the same time, the transverse bolt holes 6 reserved on the short cantilever 2 are bolted to the reserved bolt holes at the corresponding positions of the prefabricated floor slab through high-strength bolts.

[0035] The column top, column bottom, end tongue-and-groove structure 4 of the notched beam section of the short cantilever 2 and the top surface of the side wing beam 3 and the beam portion above it are the connecting parts. The prefabricated cross-story column body is crimped column-to-column and column-to-foundation through the axially reserved prestressed tendon holes 5 and post-tensioned prestressed tendons. The beam-to-beam and beam-to-column are crimped through the tongue-and-groove structure 4, longitudinally and transversely reserved prestressed tendon holes 5 and post-tensioned prestressed tendons. The beam-to-floor slab is bolted through the side wing beam 3 of the short cantilever 2 and the bolt holes 6 reserved in the beam, thereby forming a spatial force system.

[0036] In this embodiment, the groove structure 8 is in the shape of a regular quadrangular pyramid, and its structure and geometric dimensions are compatible with the flange structure reserved on the top surface of the foundation. It is convenient for quick and accurate positioning when installing the prefabricated column during construction, and plays a limiting role during use. The prefabricated column body 1 adopts linear prestressing, and the position and number of the reserved channels at the bottom of the column are consistent with the embedded steel plate 7 at the top of the column.

[0037] The short cantilever 2 carried by the prefabricated column is a part of the frame beam. By setting the short cantilever 2, the connection position between the frame beam and the frame column is away from the core area of ​​the beam-column node by a certain distance, and the beam-column connection is realized through the beam-beam connection.

[0038] The section where the tongue-and-groove structure 4 is located is the connection part of the frame beam, wherein the horizontal joint is located at the middle height of the beam section, providing vertical support for the butt-jointed prefabricated notched beam section and transferring the load. The longitudinal reinforcements of the section where the two vertical joints are located are all disconnected, and the section bearing capacity is ensured by prestressed tendons.

[0039] The short cantilevers 2 are arranged along the column structure in the longitudinal and transverse directions. The number of short cantilevers 2 at the same height position is related to the position of the column. In practical applications, three types of prefabricated cross-layer columns are mainly involved, namely corner columns, side columns and middle columns. Among them, each layer on the corner column includes two groups of short cantilevers 2, each layer on the side column includes three groups of short cantilevers 2, and each layer on the middle column includes four groups of short cantilevers 2. The short cantilevers 2 are arranged at 90 degrees. The short cantilevers 2 of the corner column and the side column only have side wing beams 3 on the inner side, and the outer side surface of the node core area and the corresponding range of the reserved hole are the anchorage area of ​​the prestressed tendons in the prefabricated column.

[0040] like Figure 3 As shown, it is a two-story, two-span prefabricated prestressed fully assembled frame. After the rectangular cross-section prefabricated column body 1 is in place through the column bottom groove structure 8, it is crimped and assembled with the column foundation by tensioning prestressed tendons. The upper end of the prestressed tendon is anchored to the column top steel plate 7, and the lower end is anchored to the bottom surface of the foundation.

[0041] After the prefabricated cross-story columns are assembled, the prefabricated frame beam sections can be further installed. The tongue-and-groove structure 4 at the end of the short cantilever 2 on the column side is the connection part of the prefabricated frame beam section, and its horizontal connection surface can provide temporary support for the erection of the prefabricated notched beam section 9, thereby realizing the installation of the longitudinal and transverse prefabricated frame beam sections without temporary support. After the prefabricated frame beam sections are installed, the prestressed tendons in the tensioned beams are used to connect the beams and columns into one, thereby forming a spatial force transmission frame system.

[0042] In order to improve the stress state of the tongue-and-groove connection area between the short cantilever 2 and the prefabricated notched beam section 9, necessary reinforcement measures can be taken as needed, including but not limited to external thin-walled steel plate sleeves, so as to restrain the relative deformation of the joint section of the beam section overlap area and prevent out-of-plane displacement.

[0043] In order to improve the stress state of concrete in the anchorage area of ​​the prestressed tendons in the beam and the anchorage effect of the ends of each prestressed tendon in the same beam section, steel plates can be embedded in the anchorage area as anchor pads according to the arrangement of the prestressed tendons in the beam during component production. The diameter, position and number of the reserved holes in the steel plates are consistent with the prestressed tendon holes in the short cantilever beam section in the corresponding direction.

[0044] After the prefabricated cross-story columns and frame beam sections are assembled, the prefabricated floor slabs can be further installed. The beam flanks 3 and the part above their top surfaces are the connection parts of the prefabricated frame beams and the prefabricated floor slabs. The longitudinal and transverse frame beams are both provided with beam flanks 3 on one side close to the prefabricated floor slabs to support the floor slabs. According to this design method, the top of the frame beam can be made flush with the top surface of the floor slab, effectively reducing the cross-sectional height of the frame beam and ensuring the room clearance size. During construction, the beam flanks 3 provide temporary support for the installation of the prefabricated floor slabs, thereby realizing the installation of the prefabricated floor slabs without temporary support. The beam flanks 3 play a shear-resistant role during use.

[0045] To facilitate production, transportation, storage and installation, it is recommended to adopt a block prefabrication scheme for prefabricated floor slabs, that is, divide the room floor slabs into several regular strip-shaped plates, and reserve bolt holes around each floor slab. After all prefabricated floor slabs are hoisted into place, the prefabricated floor slabs are bolted to the adjacent prefabricated frame beam sections through high-strength bolts to enhance the integrity and in-plane stiffness of the floor structure and improve the coordinated force performance of the floor slabs and surrounding frame beams.

[0046] When the room span is large, the floor structure can be arranged in a primary-secondary scheme. The prefabricated secondary beams are overlapped with the main beams through a tongue-and-groove structure 4 and crimped with prestressed tendons. The connection between the prefabricated secondary beams and the prefabricated floor slabs is supported by beam side wings 3 and bolted with high-strength bolts.

[0047] Matters not covered in the present invention are all known technologies.

[0048] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure, characterized in that: The cross-story column includes a prefabricated column body, a short cantilever and a pre-embedded steel plate at the top of the column; the short cantilever is fixedly connected to the side wall of the prefabricated column body at a corresponding height at uniform intervals along the height direction of the prefabricated column body; a tongue-and-groove structure is provided at the upper part of the outer end of the short cantilever; prestressed tendon holes are symmetrically provided on the left and right sides of the outer vertical end face of the short cantilever and its tongue-and-groove structure, and the prestressed tendon holes pass through the short cantilever and the prefabricated column body in sequence and are perpendicular to the prefabricated column body; the pre-embedded steel plate at the top of the column is correspondingly arranged at the top of the prefabricated column body; a groove structure is provided in the middle part of the lower end face of the prefabricated column body; bolt holes are respectively provided on the upper parts of the left and right sides of the short cantilever.

2. The prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure according to claim 1, characterized in that: One side or both sides of the short cantilever are provided with beam flanks; the beam flanks are located below the bolt holes.

3. The prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure according to claim 1, characterized in that: Prestressed tendon holes of corresponding number and position are arranged between the column top embedded steel plate and the four sides of the groove structure.

4. The prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure according to claim 1, characterized in that: The reserved channels of the longitudinal and transverse short cantilevers at the same height position of the prefabricated column body are staggered along the column height.

5. The prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure according to claim 1, characterized in that: The cross-sectional shape of the prefabricated column body is rectangular, circular, L-shaped or T-shaped.

6. The prefabricated cross-story column with short cantilever for a prestressed fully assembled frame structure according to claim 1, characterized in that: The groove structure is in the shape of a regular quadrangular pyramid, and its structure and geometric dimensions are adapted to the flange structure reserved on the top surface of the foundation.

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