CN109356286B - Assembly type reinforced concrete frame structure node unit decomposition and assembly method - Google Patents
Assembly type reinforced concrete frame structure node unit decomposition and assembly method Download PDFInfo
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- CN109356286B CN109356286B CN201811468555.3A CN201811468555A CN109356286B CN 109356286 B CN109356286 B CN 109356286B CN 201811468555 A CN201811468555 A CN 201811468555A CN 109356286 B CN109356286 B CN 109356286B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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Abstract
The invention discloses a method for decomposing and assembling node units of an assembled reinforced concrete frame structure, which comprises the steps of breaking all beam columns of a transverse frame from the middle part, decomposing the beam columns into + font non-top middle node units, T-shaped non-top side node units or top middle node units, L-shaped top side node units and bottom columns, prefabricating, then splicing the transverse frame on site, and connecting a plurality of transverse frames into a whole by using connecting beams to form an integral house frame structure.
Description
Technical Field
The invention relates to a method for decomposing and assembling node units of an assembled reinforced concrete frame structure.
Background
At present, China is developing green, environment-friendly and energy-saving prefabricated concrete structure buildings with great force, and popularization and application of the prefabricated structure can promote transformation and upgrading of the building industry of China. The core problem of fabricated buildings is the connection at the nodes. The self quality of the prefabricated components can be guaranteed from the characteristics of the prefabricated building, and the components are combined into the building by means of the nodes, so that the node performance is related to the overall performance of the building. From the stress characteristic of the beam-column node, the beam-column node is not only complex in stress and force transmission mechanism, but also easy to generate non-ductile damage. Therefore, the beam-column node is not only a key part for bearing stress of the building, but also the weakest ring of the building, and once the beam-column node is damaged, serious consequences can be caused.
At present, the assembly type assembly units which are mainstream in China and are suitable for the frame structure are independent rod units, and the independent rod units can be divided into wet connection and dry connection according to the assembly process during construction and assembly. The wet connection process is that the independent beam column rod element units are delivered to the site for splicing and hoisting after being manufactured in a factory, concrete is poured at the beam column node, and the post-pouring integral structure is completed. However, the wet connection does not leave the shadow of the integral cast-in-place structure, the essence of the wet connection is the continuation of the cast-in-place structure, and a series of problems of complex node structure, higher construction splicing difficulty, large construction site noise, serious environmental pollution and the like exist, and the wet connection does not accord with the development direction of the mainstream fabricated building.
The dry connection of the prefabricated independent beam column rod piece units is also raised domestically in recent years, and the mainstream method for the dry connection of the domestic field nodes is the grouting connection of reinforcing steel bar sleeves. The main working principle is that a steel bar arranged in one prefabricated component is in threaded connection with a sleeve, the steel bar exposed out of the other prefabricated component is inserted into the sleeve during on-site splicing, grouting ports and grout outlets are arranged on the wall of the sleeve at intervals, cement-based grouting material is poured into the sleeve after connection, and connection of adjacent assembly type building components is achieved after solidification. However, the connection mode provides extremely high precision requirements for prefabricated part products and field construction operation. In the actual construction process, all the steel bars extending out of the end parts of the prefabricated components at the nodes are difficult to align with the sleeves, so that the steel bars which are supposed to be inserted into the sleeves are cut off or the steel bars are not inserted into the steel bar sleeves according to the specified requirements and the full length, the connection quality of the nodes is finally influenced, and the integrity and the reliability of the nodes are difficult to guarantee. And the node has poor ductility, and is difficult to prevent damage under the action of earthquake load. Meanwhile, the grouting quality inspection has a series of problems of subjectivity, high detection cost and the like, and a quality detection method which is reliable, effective and low in cost is not available at home.
Therefore, no matter the wet connection or the dry connection is adopted, the node areas of the independent rod piece units have the problem of being not neglected, and the nodes can not ensure the reliability and the integrity and simplify the construction splicing to the maximum extent.
Disclosure of Invention
The invention provides an assembly type node unit suitable for a reinforced concrete frame structure, which is designed to avoid the weak part of the traditional beam-column node connection, avoid splicing at the beam-column node, and instead, splice and assemble with the middle part of a column in a beam span, prefabricate a beam-column into structural units such as plus, T, L and the like, realize the connection among the structural units by flash butt welding, greatly improve the integrity and rigidity of the assembly type reinforced concrete structure, thereby having better anti-seismic performance.
The invention provides a brand-new fabricated node unit suitable for a reinforced concrete frame structure and an assembling method thereof, and the fabricated node unit is characterized in that the width direction of a house is set as the main stress direction of a horizontal load, namely the transverse direction, and the length direction vertical to the transverse direction is marked as the longitudinal direction; a plurality of transverse frames are arranged at intervals set longitudinally in the whole frame structure house, connecting beams are arranged between every two adjacent transverse frames, and the connecting beams connect the transverse frames into a whole to form the whole house frame structure.
And decomposing all the transverse frames into node units by disconnecting all the beams and columns of the transverse frames from the middle part, and decomposing one transverse frame into + -shaped non-top middle node units, T-shaped non-top side node units or top middle node units, L-shaped top side node units and bottom columns.
The connecting beam is prefabricated, the length of the connecting beam is slightly smaller than the net distance of the transverse columns in the structural mode, and embedded angle steel is embedded in the lower edges of the two end parts of the connecting beam and used for being connected with the bracket.
And each node unit is spliced by a left beam and a right beam, an upper column and a lower column to finally form a transverse frame, each transverse frame is connected by a prefabricated connecting beam, and angle steel pre-embedded at the end part of the connecting beam and a steel sheet pre-embedded at the top of the bracket are welded by continuously adopting a flash butt welding process during splicing, so that the longitudinal connection of a plurality of frames in the main stress direction is realized.
In the node unit, the end parts of a left beam (beam positioned on the left side of the node) and a right beam (beam positioned on the right side of the node) are provided with grooves and tongues, the grooves and tongues are vertically corresponding, the upper edge and the lower edge of the end part of the beam are embedded with angle steel, and the stress bars in the beam are welded with the embedded angle steel. A groove is formed in the top of an upper column (a column above the node) of the node unit, a steel ring is embedded in the groove, and the steel ring is welded with a steel bar in the column. The top structure of the bottom column is the same as that of the upper column of the node unit. The bottom of the lower column (the column below the node) of the node unit is provided with a boss corresponding to the groove at the top of the upper column, a steel ring is embedded in the boss surface, and the steel ring and the steel bar in the column are welded into a whole. The lower column embedded steel ring and the upper column embedded steel ring are correspondingly arranged in structure.
And in the splicing process of the left beam and the right beam between the node units, firstly coating a cementing material along the contact surface, then completing the butt joint of the embedded angle steel in the beam, externally paving a steel plate on the upper part of the angle steel, realizing the longitudinal connection of the angle steel and the stressed steel bar through a welding process, and finally solidifying the cementing material to form a whole by the prefabricated beam.
The splicing of the upper column and the lower column between the node units is characterized in that materials with gelling capacity are poured into the grooves in the tops of the upper columns of the node units below the splicing part before the splicing part, and during the splicing part, the gelling materials are extruded by the bosses of the lower columns of the node units above the splicing part to fill gaps between the upper columns and the lower columns. The embedded steel rings in the upper column and the lower column are welded into a whole through a welding process of flash butt welding, so that longitudinal connection of the steel bars in the upper column and the lower column is realized, and finally the upper prefabricated column and the lower prefabricated column are connected. Meanwhile, the shearing resistance of the prefabricated column connecting node can be effectively improved through the design of the lug boss and the groove.
The invention has the beneficial effects that:
(1) effectively solves the difficult problem of beam column joint connection
The invention provides a brand new fabricated node unit suitable for a reinforced concrete frame structure and an assembling method thereof, wherein the whole frame structure is decomposed into a plurality of frames in the main stress direction, and the frames are connected into a whole through longitudinal connecting beams, and through the design of node units such as a cross shape, a T shape and an L shape, the structure and the splicing at beam-column joints are avoided, the integrity and the reliability of the joints are ensured, the principles of 'strong joints and weak members' are met, and the problem of beam-column joint connection of the traditional fabricated structure is solved.
(2) Good integrity and high rigidity
The connection between the structural units is realized through flash butt welding, and the integrity and the rigidity of the assembled reinforced concrete structure are greatly improved, so that the assembled reinforced concrete structure has better anti-seismic performance.
(3) Has stronger operability and applicability
Meanwhile, the components are connected by welding the steel sheets, the defect that the steel bars of the sleeve connecting components are difficult to be accurately butted is overcome, the requirements on the prefabricated component products and the site construction operation precision are low, the labor cost is reduced, the construction efficiency is improved, the construction quality is easy to guarantee, and the possibility is provided for large-scale popularization of the assembled structure.
Drawings
Fig. 1 is a schematic diagram of a frame structure.
Figure 2 a flat layout of the lattice of the frame structure.
FIG. 3 is a schematic view of a transverse frame.
FIG. 4 is a perspective view of each node unit, wherein a is a T-shaped node unit, b is a + shaped node unit, and c is an L-shaped node unit.
FIG. 5 is a sectional structural view of an upper column and a lower column of a node unit. The drawing a is an upper column, and the drawing b is a lower column.
Fig. 6 is a bottom view at the lower column end of the node unit.
FIG. 7 is a schematic diagram of joint unit column end construction connection.
FIG. 8 is a schematic view of the connection of beams between node elements.
FIG. 9 is a schematic view of a bracket connection section of the connection beam.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Examples
Fig. 1 shows a frame structure of a building, in which the building width direction is the main force receiving direction of a horizontal load, which is referred to as the lateral direction, and the longitudinal direction perpendicular to the lateral direction is referred to as the longitudinal direction. Seven transverse frames 1 are arranged at intervals set in the longitudinal direction of the whole frame structure building, and the total number is seven. A connecting beam is arranged between adjacent transverse frames, and one transverse frame is integrally connected by the connecting beam 2 to form an integral building frame structure. Figure 2 illustrates the flat arrangement of the lattice of the building frame structure.
Fig. 3 shows a single transverse frame composed of three beams and four columns, all the columns of the transverse frame are divided from the middle as shown by the dotted lines in fig. 3, and the single transverse frame is divided into + shaped non-top middle node units 5, T-shaped non-top side node units 4, T-shaped top middle node units 4, L-shaped top side node units 3, and bottom columns 101, and the structural shapes of the node units are shown in fig. 4.
As shown in fig. 4, in the node unit, the left beam end portion is provided with an upward tongue-and-groove 401, and the right beam end portion is correspondingly provided with a downward tongue-and-groove 402. And angle steel 14 is embedded at the edges of the upper opening edge and the lower opening edge of the rabbet, and the stress bar in the beam is welded with the embedded angle steel.
As shown in fig. 5 and 6, a groove 10 is formed in the top of an upper column 11 (a column located above a node) of the node unit, the groove is of a quadrangular frustum pyramid depression structure, a steel ring 8 is embedded in the groove, the steel ring is in a shape of a square, and the steel ring is welded with a steel bar 7 in the column. The top structure of the bottom pillar 101 is the same as the top structure of the upper pillar of the node unit. The bottom of the lower column 6 (column below the node) of the node unit is provided with a boss 9 corresponding to the groove at the top of the upper column, the boss is a quadrangular frustum pyramid, a steel ring 8 is embedded in the boss surface, the steel ring is also in a shape of a square, and the steel ring 8 and the steel bar 7 in the column are welded into a whole.
The node of three kinds of node units is equipped with bracket 19 along vertical, and the embedded steel sheet of bracket top surface, bracket are used for being connected with vertical tie beam 2. The lower edges of the end parts of the two ends of the connecting beam are embedded with embedded angle steel 18 for connecting with a bracket.
As shown in fig. 8, in the process of splicing the beams between the node units (i.e. splicing the left beam and the right beam), firstly, a cementing material is coated along the splicing contact surface of the two beams, then, the butt joint of the embedded angle steels 14 of the left beam and the right beam is completed, steel plates 16 are externally laid on the upper portions of the angle steels, welding is carried out, and finally, when the cementing material is solidified, the precast beams are solidified into a whole.
As shown in FIG. 7, before splicing, the upper column 11 and the lower column 6 between the node units are poured with the cementing material 12 into the groove 10 at the top of the prefabricated column, and during splicing, the cementing material 12 is squeezed by the lower column rib 9 of the upper node unit to fill the gap between the upper column and the lower column. The embedded steel rings 8 in the upper column and the lower column are welded into a whole through a welding process of flash butt welding, so that longitudinal connection of reinforcing steel bars in the upper column and the lower column is realized, and finally the upper prefabricated column and the lower prefabricated column are connected. Simultaneously, the shearing resistance of the prefabricated column connecting node can be effectively improved through the design of the prismatic table and the groove.
Each node unit finally forms a transverse frame in the main stress direction by splicing the left beam, the right beam, the upper column and the lower column.
The transverse frames are connected through prefabricated connecting beams. As shown in fig. 9, the length of the connecting beam 17 is slightly less than the net distance between the transverse frames, and the flash butt welding process is continuously adopted to weld the angle steel 18 pre-embedded at the end of the connecting beam with the steel plate 20 pre-embedded at the top of the bracket during splicing, so that the longitudinal connection of a plurality of frames in the main stress direction is realized.
Claims (5)
1. A method for decomposing and assembling node units of an assembled reinforced concrete frame structure is characterized by comprising the following steps:
setting the width direction of the house as the main force bearing direction of a horizontal load, namely the transverse direction, and setting the length direction vertical to the transverse direction as the longitudinal direction; the whole frame structure house is provided with one transverse frame at intervals set longitudinally, and connecting beams are arranged between every two adjacent transverse frames and connect the transverse frames into a whole to form a whole house frame structure;
firstly, decomposing each transverse frame into node units, wherein the decomposition method comprises the steps of breaking all beam columns of the transverse frames from the middle part, decomposing one transverse frame into a + -shaped non-top middle node unit, a T-shaped non-top side node unit or a top middle node unit, an L-shaped top side node unit and a bottom column, longitudinally arranging a bracket at the node of each node unit, and connecting the top surface embedded steel plate of the bracket with a longitudinal connecting beam;
according to the structure of a transverse frame, each node unit and bottom column are spliced through a left beam and a right beam and an upper column and a lower column to finally form the transverse frame, and the transverse frames are connected through connecting beams to form the house frame structure.
2. The assembly type reinforced concrete frame structure node unit disassembling and assembling method according to claim 1, wherein: the connecting beam is connected with the transverse frame in a mode that angle steel pre-embedded at the end part of the connecting beam is welded with steel sheets pre-embedded at the tops of the brackets of the node units by adopting a flash butt welding process, so that longitudinal connection of frames in the main stress direction is realized.
3. The assembly type reinforced concrete frame structure node unit disassembling and assembling method according to claim 1, wherein:
the left beam end and the right beam end of the node unit are provided with grooves and tongues, the grooves and tongues are corresponding up and down, angle steel is embedded at the upper edge and the lower edge of the beam end, and a stress bar in the beam is welded with the embedded angle steel;
a groove is formed in the top of an upper column of the node unit, a steel ring is embedded in the groove, and the steel ring is welded with a steel bar in the column; the top structure of the bottom column is the same as that of the upper column of the node unit;
the bottom of the lower column of the node unit is provided with a boss corresponding to the groove at the top of the upper column, a steel ring is embedded in the boss surface, and the steel ring and the steel bar in the column are welded into a whole;
the lower column embedded steel ring and the upper column embedded steel ring are correspondingly arranged in structure.
4. The assembly type reinforced concrete frame structure node unit disassembling and assembling method according to claim 1, wherein: the left beam and the right beam between the node units are spliced, firstly, a cementing material is coated along a contact surface, then, the butt joint of the embedded angle steel in the beam is completed, the upper part of the angle steel is externally paved with a steel plate, the longitudinal connection between the angle steel and the stressed steel bar is realized through a welding process, and finally, when the cementing material is cured, the prefabricated beam is solidified into a whole.
5. The assembly type reinforced concrete frame structure node unit disassembling and assembling method according to claim 1, wherein: the upper column and the lower column between the node units are spliced, a material with gelling capacity is poured into a groove at the top of the upper column of the node unit below the splice before splicing, and during splicing, the gelling material is extruded by a boss of the lower column of the node unit above the splice to fill a gap between the upper column and the lower column; the embedded steel rings in the upper column and the lower column are welded into a whole through a welding process of flash butt welding, so that longitudinal connection of the steel bars in the upper column and the lower column is realized, and finally the upper prefabricated column and the lower prefabricated column are connected.
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| CN109853954B (en) * | 2019-03-04 | 2021-06-01 | 吉林建筑大学 | Disassembling and constructing method for assembly type concrete frame structure |
| CN109797971B (en) * | 2019-03-12 | 2020-05-19 | 中国矿业大学 | Disassembling and assembling method for cast-in-place reinforced concrete frame structure building component |
| CN113006279B (en) * | 2021-03-19 | 2022-05-06 | 山东建筑大学 | Inorganic adhesive composite bamboo-wood structure middle beam-column connection node, frame structure and method |
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| TW201247975A (en) * | 2011-05-30 | 2012-12-01 | Univ Nat Taiwan Science Tech | Steel frame structure |
| CN203096926U (en) * | 2013-01-15 | 2013-07-31 | 中南大学 | Novel substructure module-type prefabricated frame structure to be mounted in manner of splicing |
| CN106869321A (en) * | 2017-03-16 | 2017-06-20 | 南昌大学 | The prefabricated regeneration concrete bean column node and its construction method of a kind of reinforcement |
| CN207176731U (en) * | 2017-08-14 | 2018-04-03 | 建华建材（广西）有限公司 | A kind of prefabricated concrete pipe gallery support |
| CN108049498B (en) * | 2017-12-06 | 2019-09-06 | 四川大学 | The prefabricated post and Prefabricated beam connection structure and method of assembled architecture frame structure |
| CN207919796U (en) * | 2018-01-24 | 2018-09-28 | 西安建筑科技大学 | A kind of high ductility concrete connecting-beam of replaceable assembled |
| CN108179809A (en) * | 2018-03-15 | 2018-06-19 | 莆田学院 | The connection method of assembled steel tendon concrete frame structure component |
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